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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * omap_hwmod implementation for OMAP2/3/4
4 *
5 * Copyright (C) 2009-2011 Nokia Corporation
6 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 *
8 * Paul Walmsley, Benoît Cousson, Kevin Hilman
9 *
10 * Created in collaboration with (alphabetical order): Thara Gopinath,
11 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
12 * Sawant, Santosh Shilimkar, Richard Woodruff
13 *
14 * Introduction
15 * ------------
16 * One way to view an OMAP SoC is as a collection of largely unrelated
17 * IP blocks connected by interconnects. The IP blocks include
18 * devices such as ARM processors, audio serial interfaces, UARTs,
19 * etc. Some of these devices, like the DSP, are created by TI;
20 * others, like the SGX, largely originate from external vendors. In
21 * TI's documentation, on-chip devices are referred to as "OMAP
22 * modules." Some of these IP blocks are identical across several
23 * OMAP versions. Others are revised frequently.
24 *
25 * These OMAP modules are tied together by various interconnects.
26 * Most of the address and data flow between modules is via OCP-based
27 * interconnects such as the L3 and L4 buses; but there are other
28 * interconnects that distribute the hardware clock tree, handle idle
29 * and reset signaling, supply power, and connect the modules to
30 * various pads or balls on the OMAP package.
31 *
32 * OMAP hwmod provides a consistent way to describe the on-chip
33 * hardware blocks and their integration into the rest of the chip.
34 * This description can be automatically generated from the TI
35 * hardware database. OMAP hwmod provides a standard, consistent API
36 * to reset, enable, idle, and disable these hardware blocks. And
37 * hwmod provides a way for other core code, such as the Linux device
38 * code or the OMAP power management and address space mapping code,
39 * to query the hardware database.
40 *
41 * Using hwmod
42 * -----------
43 * Drivers won't call hwmod functions directly. That is done by the
44 * omap_device code, and in rare occasions, by custom integration code
45 * in arch/arm/ *omap*. The omap_device code includes functions to
46 * build a struct platform_device using omap_hwmod data, and that is
47 * currently how hwmod data is communicated to drivers and to the
48 * Linux driver model. Most drivers will call omap_hwmod functions only
49 * indirectly, via pm_runtime*() functions.
50 *
51 * From a layering perspective, here is where the OMAP hwmod code
52 * fits into the kernel software stack:
53 *
54 * +-------------------------------+
55 * | Device driver code |
56 * | (e.g., drivers/) |
57 * +-------------------------------+
58 * | Linux driver model |
59 * | (platform_device / |
60 * | platform_driver data/code) |
61 * +-------------------------------+
62 * | OMAP core-driver integration |
63 * |(arch/arm/mach-omap2/devices.c)|
64 * +-------------------------------+
65 * | omap_device code |
66 * | (../plat-omap/omap_device.c) |
67 * +-------------------------------+
68 * ----> | omap_hwmod code/data | <-----
69 * | (../mach-omap2/omap_hwmod*) |
70 * +-------------------------------+
71 * | OMAP clock/PRCM/register fns |
72 * | ({read,write}l_relaxed, clk*) |
73 * +-------------------------------+
74 *
75 * Device drivers should not contain any OMAP-specific code or data in
76 * them. They should only contain code to operate the IP block that
77 * the driver is responsible for. This is because these IP blocks can
78 * also appear in other SoCs, either from TI (such as DaVinci) or from
79 * other manufacturers; and drivers should be reusable across other
80 * platforms.
81 *
82 * The OMAP hwmod code also will attempt to reset and idle all on-chip
83 * devices upon boot. The goal here is for the kernel to be
84 * completely self-reliant and independent from bootloaders. This is
85 * to ensure a repeatable configuration, both to ensure consistent
86 * runtime behavior, and to make it easier for others to reproduce
87 * bugs.
88 *
89 * OMAP module activity states
90 * ---------------------------
91 * The hwmod code considers modules to be in one of several activity
92 * states. IP blocks start out in an UNKNOWN state, then once they
93 * are registered via the hwmod code, proceed to the REGISTERED state.
94 * Once their clock names are resolved to clock pointers, the module
95 * enters the CLKS_INITED state; and finally, once the module has been
96 * reset and the integration registers programmed, the INITIALIZED state
97 * is entered. The hwmod code will then place the module into either
98 * the IDLE state to save power, or in the case of a critical system
99 * module, the ENABLED state.
100 *
101 * OMAP core integration code can then call omap_hwmod*() functions
102 * directly to move the module between the IDLE, ENABLED, and DISABLED
103 * states, as needed. This is done during both the PM idle loop, and
104 * in the OMAP core integration code's implementation of the PM runtime
105 * functions.
106 *
107 * References
108 * ----------
109 * This is a partial list.
110 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
111 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
112 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
113 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
114 * - Open Core Protocol Specification 2.2
115 *
116 * To do:
117 * - handle IO mapping
118 * - bus throughput & module latency measurement code
119 *
120 * XXX add tests at the beginning of each function to ensure the hwmod is
121 * in the appropriate state
122 * XXX error return values should be checked to ensure that they are
123 * appropriate
124 */
125#undef DEBUG
126
127#include <linux/kernel.h>
128#include <linux/errno.h>
129#include <linux/io.h>
130#include <linux/clk.h>
131#include <linux/clk-provider.h>
132#include <linux/delay.h>
133#include <linux/err.h>
134#include <linux/list.h>
135#include <linux/mutex.h>
136#include <linux/spinlock.h>
137#include <linux/slab.h>
138#include <linux/cpu.h>
139#include <linux/of.h>
140#include <linux/of_address.h>
141#include <linux/memblock.h>
142
143#include <linux/platform_data/ti-sysc.h>
144
145#include <dt-bindings/bus/ti-sysc.h>
146
147#include <asm/system_misc.h>
148
149#include "clock.h"
150#include "omap_hwmod.h"
151
152#include "soc.h"
153#include "common.h"
154#include "clockdomain.h"
155#include "hdq1w.h"
156#include "mmc.h"
157#include "powerdomain.h"
158#include "cm2xxx.h"
159#include "cm3xxx.h"
160#include "cm33xx.h"
161#include "prm.h"
162#include "prm3xxx.h"
163#include "prm44xx.h"
164#include "prm33xx.h"
165#include "prminst44xx.h"
166#include "pm.h"
167#include "wd_timer.h"
168
169/* Name of the OMAP hwmod for the MPU */
170#define MPU_INITIATOR_NAME "mpu"
171
172/*
173 * Number of struct omap_hwmod_link records per struct
174 * omap_hwmod_ocp_if record (master->slave and slave->master)
175 */
176#define LINKS_PER_OCP_IF 2
177
178/*
179 * Address offset (in bytes) between the reset control and the reset
180 * status registers: 4 bytes on OMAP4
181 */
182#define OMAP4_RST_CTRL_ST_OFFSET 4
183
184/*
185 * Maximum length for module clock handle names
186 */
187#define MOD_CLK_MAX_NAME_LEN 32
188
189/**
190 * struct clkctrl_provider - clkctrl provider mapping data
191 * @num_addrs: number of base address ranges for the provider
192 * @addr: base address(es) for the provider
193 * @size: size(s) of the provider address space(s)
194 * @node: device node associated with the provider
195 * @link: list link
196 */
197struct clkctrl_provider {
198 int num_addrs;
199 u32 *addr;
200 u32 *size;
201 struct device_node *node;
202 struct list_head link;
203};
204
205static LIST_HEAD(clkctrl_providers);
206
207/**
208 * struct omap_hwmod_reset - IP specific reset functions
209 * @match: string to match against the module name
210 * @len: number of characters to match
211 * @reset: IP specific reset function
212 *
213 * Used only in cases where struct omap_hwmod is dynamically allocated.
214 */
215struct omap_hwmod_reset {
216 const char *match;
217 int len;
218 int (*reset)(struct omap_hwmod *oh);
219};
220
221/**
222 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
223 * @enable_module: function to enable a module (via MODULEMODE)
224 * @disable_module: function to disable a module (via MODULEMODE)
225 *
226 * XXX Eventually this functionality will be hidden inside the PRM/CM
227 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
228 * conditionals in this code.
229 */
230struct omap_hwmod_soc_ops {
231 void (*enable_module)(struct omap_hwmod *oh);
232 int (*disable_module)(struct omap_hwmod *oh);
233 int (*wait_target_ready)(struct omap_hwmod *oh);
234 int (*assert_hardreset)(struct omap_hwmod *oh,
235 struct omap_hwmod_rst_info *ohri);
236 int (*deassert_hardreset)(struct omap_hwmod *oh,
237 struct omap_hwmod_rst_info *ohri);
238 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
239 struct omap_hwmod_rst_info *ohri);
240 int (*init_clkdm)(struct omap_hwmod *oh);
241 void (*update_context_lost)(struct omap_hwmod *oh);
242 int (*get_context_lost)(struct omap_hwmod *oh);
243 int (*disable_direct_prcm)(struct omap_hwmod *oh);
244 u32 (*xlate_clkctrl)(struct omap_hwmod *oh);
245};
246
247/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
248static struct omap_hwmod_soc_ops soc_ops;
249
250/* omap_hwmod_list contains all registered struct omap_hwmods */
251static LIST_HEAD(omap_hwmod_list);
252static DEFINE_MUTEX(list_lock);
253
254/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
255static struct omap_hwmod *mpu_oh;
256
257/* inited: set to true once the hwmod code is initialized */
258static bool inited;
259
260/* Private functions */
261
262/**
263 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
264 * @oh: struct omap_hwmod *
265 *
266 * Load the current value of the hwmod OCP_SYSCONFIG register into the
267 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
268 * OCP_SYSCONFIG register or 0 upon success.
269 */
270static int _update_sysc_cache(struct omap_hwmod *oh)
271{
272 if (!oh->class->sysc) {
273 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
274 return -EINVAL;
275 }
276
277 /* XXX ensure module interface clock is up */
278
279 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
280
281 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
282 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
283
284 return 0;
285}
286
287/**
288 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
289 * @v: OCP_SYSCONFIG value to write
290 * @oh: struct omap_hwmod *
291 *
292 * Write @v into the module class' OCP_SYSCONFIG register, if it has
293 * one. No return value.
294 */
295static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
296{
297 if (!oh->class->sysc) {
298 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
299 return;
300 }
301
302 /* XXX ensure module interface clock is up */
303
304 /* Module might have lost context, always update cache and register */
305 oh->_sysc_cache = v;
306
307 /*
308 * Some IP blocks (such as RTC) require unlocking of IP before
309 * accessing its registers. If a function pointer is present
310 * to unlock, then call it before accessing sysconfig and
311 * call lock after writing sysconfig.
312 */
313 if (oh->class->unlock)
314 oh->class->unlock(oh);
315
316 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
317
318 if (oh->class->lock)
319 oh->class->lock(oh);
320}
321
322/**
323 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
324 * @oh: struct omap_hwmod *
325 * @standbymode: MIDLEMODE field bits
326 * @v: pointer to register contents to modify
327 *
328 * Update the master standby mode bits in @v to be @standbymode for
329 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
330 * upon error or 0 upon success.
331 */
332static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
333 u32 *v)
334{
335 u32 mstandby_mask;
336 u8 mstandby_shift;
337
338 if (!oh->class->sysc ||
339 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
340 return -EINVAL;
341
342 if (!oh->class->sysc->sysc_fields) {
343 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
344 return -EINVAL;
345 }
346
347 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
348 mstandby_mask = (0x3 << mstandby_shift);
349
350 *v &= ~mstandby_mask;
351 *v |= __ffs(standbymode) << mstandby_shift;
352
353 return 0;
354}
355
356/**
357 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
358 * @oh: struct omap_hwmod *
359 * @idlemode: SIDLEMODE field bits
360 * @v: pointer to register contents to modify
361 *
362 * Update the slave idle mode bits in @v to be @idlemode for the @oh
363 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
364 * or 0 upon success.
365 */
366static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
367{
368 u32 sidle_mask;
369 u8 sidle_shift;
370
371 if (!oh->class->sysc ||
372 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
373 return -EINVAL;
374
375 if (!oh->class->sysc->sysc_fields) {
376 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
377 return -EINVAL;
378 }
379
380 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
381 sidle_mask = (0x3 << sidle_shift);
382
383 *v &= ~sidle_mask;
384 *v |= __ffs(idlemode) << sidle_shift;
385
386 return 0;
387}
388
389/**
390 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
391 * @oh: struct omap_hwmod *
392 * @clockact: CLOCKACTIVITY field bits
393 * @v: pointer to register contents to modify
394 *
395 * Update the clockactivity mode bits in @v to be @clockact for the
396 * @oh hwmod. Used for additional powersaving on some modules. Does
397 * not write to the hardware. Returns -EINVAL upon error or 0 upon
398 * success.
399 */
400static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
401{
402 u32 clkact_mask;
403 u8 clkact_shift;
404
405 if (!oh->class->sysc ||
406 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
407 return -EINVAL;
408
409 if (!oh->class->sysc->sysc_fields) {
410 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
411 return -EINVAL;
412 }
413
414 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
415 clkact_mask = (0x3 << clkact_shift);
416
417 *v &= ~clkact_mask;
418 *v |= clockact << clkact_shift;
419
420 return 0;
421}
422
423/**
424 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
425 * @oh: struct omap_hwmod *
426 * @v: pointer to register contents to modify
427 *
428 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
429 * error or 0 upon success.
430 */
431static int _set_softreset(struct omap_hwmod *oh, u32 *v)
432{
433 u32 softrst_mask;
434
435 if (!oh->class->sysc ||
436 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
437 return -EINVAL;
438
439 if (!oh->class->sysc->sysc_fields) {
440 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
441 return -EINVAL;
442 }
443
444 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
445
446 *v |= softrst_mask;
447
448 return 0;
449}
450
451/**
452 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
453 * @oh: struct omap_hwmod *
454 * @v: pointer to register contents to modify
455 *
456 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
457 * error or 0 upon success.
458 */
459static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
460{
461 u32 softrst_mask;
462
463 if (!oh->class->sysc ||
464 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
465 return -EINVAL;
466
467 if (!oh->class->sysc->sysc_fields) {
468 WARN(1,
469 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
470 oh->name);
471 return -EINVAL;
472 }
473
474 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
475
476 *v &= ~softrst_mask;
477
478 return 0;
479}
480
481/**
482 * _wait_softreset_complete - wait for an OCP softreset to complete
483 * @oh: struct omap_hwmod * to wait on
484 *
485 * Wait until the IP block represented by @oh reports that its OCP
486 * softreset is complete. This can be triggered by software (see
487 * _ocp_softreset()) or by hardware upon returning from off-mode (one
488 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
489 * microseconds. Returns the number of microseconds waited.
490 */
491static int _wait_softreset_complete(struct omap_hwmod *oh)
492{
493 struct omap_hwmod_class_sysconfig *sysc;
494 u32 softrst_mask;
495 int c = 0;
496
497 sysc = oh->class->sysc;
498
499 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS && sysc->syss_offs > 0)
500 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
501 & SYSS_RESETDONE_MASK),
502 MAX_MODULE_SOFTRESET_WAIT, c);
503 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
504 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
505 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
506 & softrst_mask),
507 MAX_MODULE_SOFTRESET_WAIT, c);
508 }
509
510 return c;
511}
512
513/**
514 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
515 * @oh: struct omap_hwmod *
516 *
517 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
518 * of some modules. When the DMA must perform read/write accesses, the
519 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
520 * for power management, software must set the DMADISABLE bit back to 1.
521 *
522 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
523 * error or 0 upon success.
524 */
525static int _set_dmadisable(struct omap_hwmod *oh)
526{
527 u32 v;
528 u32 dmadisable_mask;
529
530 if (!oh->class->sysc ||
531 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
532 return -EINVAL;
533
534 if (!oh->class->sysc->sysc_fields) {
535 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
536 return -EINVAL;
537 }
538
539 /* clocks must be on for this operation */
540 if (oh->_state != _HWMOD_STATE_ENABLED) {
541 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
542 return -EINVAL;
543 }
544
545 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
546
547 v = oh->_sysc_cache;
548 dmadisable_mask =
549 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
550 v |= dmadisable_mask;
551 _write_sysconfig(v, oh);
552
553 return 0;
554}
555
556/**
557 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
558 * @oh: struct omap_hwmod *
559 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
560 * @v: pointer to register contents to modify
561 *
562 * Update the module autoidle bit in @v to be @autoidle for the @oh
563 * hwmod. The autoidle bit controls whether the module can gate
564 * internal clocks automatically when it isn't doing anything; the
565 * exact function of this bit varies on a per-module basis. This
566 * function does not write to the hardware. Returns -EINVAL upon
567 * error or 0 upon success.
568 */
569static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
570 u32 *v)
571{
572 u32 autoidle_mask;
573 u8 autoidle_shift;
574
575 if (!oh->class->sysc ||
576 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
577 return -EINVAL;
578
579 if (!oh->class->sysc->sysc_fields) {
580 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
581 return -EINVAL;
582 }
583
584 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
585 autoidle_mask = (0x1 << autoidle_shift);
586
587 *v &= ~autoidle_mask;
588 *v |= autoidle << autoidle_shift;
589
590 return 0;
591}
592
593/**
594 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
595 * @oh: struct omap_hwmod *
596 *
597 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
598 * upon error or 0 upon success.
599 */
600static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
601{
602 if (!oh->class->sysc ||
603 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
604 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
605 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
606 return -EINVAL;
607
608 if (!oh->class->sysc->sysc_fields) {
609 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
610 return -EINVAL;
611 }
612
613 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
614 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
615
616 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
617 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
618 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
619 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
620
621 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
622
623 return 0;
624}
625
626static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
627{
628 struct clk_hw_omap *clk;
629
630 if (!oh)
631 return NULL;
632
633 if (oh->clkdm) {
634 return oh->clkdm;
635 } else if (oh->_clk) {
636 if (!omap2_clk_is_hw_omap(__clk_get_hw(oh->_clk)))
637 return NULL;
638 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
639 return clk->clkdm;
640 }
641 return NULL;
642}
643
644/**
645 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
646 * @oh: struct omap_hwmod *
647 *
648 * Prevent the hardware module @oh from entering idle while the
649 * hardare module initiator @init_oh is active. Useful when a module
650 * will be accessed by a particular initiator (e.g., if a module will
651 * be accessed by the IVA, there should be a sleepdep between the IVA
652 * initiator and the module). Only applies to modules in smart-idle
653 * mode. If the clockdomain is marked as not needing autodeps, return
654 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
655 * passes along clkdm_add_sleepdep() value upon success.
656 */
657static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
658{
659 struct clockdomain *clkdm, *init_clkdm;
660
661 clkdm = _get_clkdm(oh);
662 init_clkdm = _get_clkdm(init_oh);
663
664 if (!clkdm || !init_clkdm)
665 return -EINVAL;
666
667 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
668 return 0;
669
670 return clkdm_add_sleepdep(clkdm, init_clkdm);
671}
672
673/**
674 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
675 * @oh: struct omap_hwmod *
676 *
677 * Allow the hardware module @oh to enter idle while the hardare
678 * module initiator @init_oh is active. Useful when a module will not
679 * be accessed by a particular initiator (e.g., if a module will not
680 * be accessed by the IVA, there should be no sleepdep between the IVA
681 * initiator and the module). Only applies to modules in smart-idle
682 * mode. If the clockdomain is marked as not needing autodeps, return
683 * 0 without doing anything. Returns -EINVAL upon error or passes
684 * along clkdm_del_sleepdep() value upon success.
685 */
686static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
687{
688 struct clockdomain *clkdm, *init_clkdm;
689
690 clkdm = _get_clkdm(oh);
691 init_clkdm = _get_clkdm(init_oh);
692
693 if (!clkdm || !init_clkdm)
694 return -EINVAL;
695
696 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
697 return 0;
698
699 return clkdm_del_sleepdep(clkdm, init_clkdm);
700}
701
702static const struct of_device_id ti_clkctrl_match_table[] __initconst = {
703 { .compatible = "ti,clkctrl" },
704 { }
705};
706
707static int __init _setup_clkctrl_provider(struct device_node *np)
708{
709 const __be32 *addrp;
710 struct clkctrl_provider *provider;
711 u64 size;
712 int i;
713
714 provider = memblock_alloc(sizeof(*provider), SMP_CACHE_BYTES);
715 if (!provider)
716 return -ENOMEM;
717
718 provider->node = np;
719
720 provider->num_addrs =
721 of_property_count_elems_of_size(np, "reg", sizeof(u32)) / 2;
722
723 provider->addr =
724 memblock_alloc(sizeof(void *) * provider->num_addrs,
725 SMP_CACHE_BYTES);
726 if (!provider->addr)
727 return -ENOMEM;
728
729 provider->size =
730 memblock_alloc(sizeof(u32) * provider->num_addrs,
731 SMP_CACHE_BYTES);
732 if (!provider->size)
733 return -ENOMEM;
734
735 for (i = 0; i < provider->num_addrs; i++) {
736 addrp = of_get_address(np, i, &size, NULL);
737 provider->addr[i] = (u32)of_translate_address(np, addrp);
738 provider->size[i] = size;
739 pr_debug("%s: %pOF: %x...%x\n", __func__, np, provider->addr[i],
740 provider->addr[i] + provider->size[i]);
741 }
742
743 list_add(&provider->link, &clkctrl_providers);
744
745 return 0;
746}
747
748static int __init _init_clkctrl_providers(void)
749{
750 struct device_node *np;
751 int ret = 0;
752
753 for_each_matching_node(np, ti_clkctrl_match_table) {
754 ret = _setup_clkctrl_provider(np);
755 if (ret) {
756 of_node_put(np);
757 break;
758 }
759 }
760
761 return ret;
762}
763
764static u32 _omap4_xlate_clkctrl(struct omap_hwmod *oh)
765{
766 if (!oh->prcm.omap4.modulemode)
767 return 0;
768
769 return omap_cm_xlate_clkctrl(oh->clkdm->prcm_partition,
770 oh->clkdm->cm_inst,
771 oh->prcm.omap4.clkctrl_offs);
772}
773
774static struct clk *_lookup_clkctrl_clk(struct omap_hwmod *oh)
775{
776 struct clkctrl_provider *provider;
777 struct clk *clk;
778 u32 addr;
779
780 if (!soc_ops.xlate_clkctrl)
781 return NULL;
782
783 addr = soc_ops.xlate_clkctrl(oh);
784 if (!addr)
785 return NULL;
786
787 pr_debug("%s: %s: addr=%x\n", __func__, oh->name, addr);
788
789 list_for_each_entry(provider, &clkctrl_providers, link) {
790 int i;
791
792 for (i = 0; i < provider->num_addrs; i++) {
793 if (provider->addr[i] <= addr &&
794 provider->addr[i] + provider->size[i] > addr) {
795 struct of_phandle_args clkspec;
796
797 clkspec.np = provider->node;
798 clkspec.args_count = 2;
799 clkspec.args[0] = addr - provider->addr[0];
800 clkspec.args[1] = 0;
801
802 clk = of_clk_get_from_provider(&clkspec);
803
804 pr_debug("%s: %s got %p (offset=%x, provider=%pOF)\n",
805 __func__, oh->name, clk,
806 clkspec.args[0], provider->node);
807
808 return clk;
809 }
810 }
811 }
812
813 return NULL;
814}
815
816/**
817 * _init_main_clk - get a struct clk * for the hwmod's main functional clk
818 * @oh: struct omap_hwmod *
819 *
820 * Called from _init_clocks(). Populates the @oh _clk (main
821 * functional clock pointer) if a clock matching the hwmod name is found,
822 * or a main_clk is present. Returns 0 on success or -EINVAL on error.
823 */
824static int _init_main_clk(struct omap_hwmod *oh)
825{
826 int ret = 0;
827 struct clk *clk = NULL;
828
829 clk = _lookup_clkctrl_clk(oh);
830
831 if (!IS_ERR_OR_NULL(clk)) {
832 pr_debug("%s: mapped main_clk %s for %s\n", __func__,
833 __clk_get_name(clk), oh->name);
834 oh->main_clk = __clk_get_name(clk);
835 oh->_clk = clk;
836 soc_ops.disable_direct_prcm(oh);
837 } else {
838 if (!oh->main_clk)
839 return 0;
840
841 oh->_clk = clk_get(NULL, oh->main_clk);
842 }
843
844 if (IS_ERR(oh->_clk)) {
845 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
846 oh->name, oh->main_clk);
847 return -EINVAL;
848 }
849 /*
850 * HACK: This needs a re-visit once clk_prepare() is implemented
851 * to do something meaningful. Today its just a no-op.
852 * If clk_prepare() is used at some point to do things like
853 * voltage scaling etc, then this would have to be moved to
854 * some point where subsystems like i2c and pmic become
855 * available.
856 */
857 clk_prepare(oh->_clk);
858
859 if (!_get_clkdm(oh))
860 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
861 oh->name, oh->main_clk);
862
863 return ret;
864}
865
866/**
867 * _init_interface_clks - get a struct clk * for the hwmod's interface clks
868 * @oh: struct omap_hwmod *
869 *
870 * Called from _init_clocks(). Populates the @oh OCP slave interface
871 * clock pointers. Returns 0 on success or -EINVAL on error.
872 */
873static int _init_interface_clks(struct omap_hwmod *oh)
874{
875 struct omap_hwmod_ocp_if *os;
876 struct clk *c;
877 int ret = 0;
878
879 list_for_each_entry(os, &oh->slave_ports, node) {
880 if (!os->clk)
881 continue;
882
883 c = clk_get(NULL, os->clk);
884 if (IS_ERR(c)) {
885 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
886 oh->name, os->clk);
887 ret = -EINVAL;
888 continue;
889 }
890 os->_clk = c;
891 /*
892 * HACK: This needs a re-visit once clk_prepare() is implemented
893 * to do something meaningful. Today its just a no-op.
894 * If clk_prepare() is used at some point to do things like
895 * voltage scaling etc, then this would have to be moved to
896 * some point where subsystems like i2c and pmic become
897 * available.
898 */
899 clk_prepare(os->_clk);
900 }
901
902 return ret;
903}
904
905/**
906 * _init_opt_clk - get a struct clk * for the hwmod's optional clocks
907 * @oh: struct omap_hwmod *
908 *
909 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
910 * clock pointers. Returns 0 on success or -EINVAL on error.
911 */
912static int _init_opt_clks(struct omap_hwmod *oh)
913{
914 struct omap_hwmod_opt_clk *oc;
915 struct clk *c;
916 int i;
917 int ret = 0;
918
919 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
920 c = clk_get(NULL, oc->clk);
921 if (IS_ERR(c)) {
922 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
923 oh->name, oc->clk);
924 ret = -EINVAL;
925 continue;
926 }
927 oc->_clk = c;
928 /*
929 * HACK: This needs a re-visit once clk_prepare() is implemented
930 * to do something meaningful. Today its just a no-op.
931 * If clk_prepare() is used at some point to do things like
932 * voltage scaling etc, then this would have to be moved to
933 * some point where subsystems like i2c and pmic become
934 * available.
935 */
936 clk_prepare(oc->_clk);
937 }
938
939 return ret;
940}
941
942static void _enable_optional_clocks(struct omap_hwmod *oh)
943{
944 struct omap_hwmod_opt_clk *oc;
945 int i;
946
947 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
948
949 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
950 if (oc->_clk) {
951 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
952 __clk_get_name(oc->_clk));
953 clk_enable(oc->_clk);
954 }
955}
956
957static void _disable_optional_clocks(struct omap_hwmod *oh)
958{
959 struct omap_hwmod_opt_clk *oc;
960 int i;
961
962 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
963
964 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
965 if (oc->_clk) {
966 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
967 __clk_get_name(oc->_clk));
968 clk_disable(oc->_clk);
969 }
970}
971
972/**
973 * _enable_clocks - enable hwmod main clock and interface clocks
974 * @oh: struct omap_hwmod *
975 *
976 * Enables all clocks necessary for register reads and writes to succeed
977 * on the hwmod @oh. Returns 0.
978 */
979static int _enable_clocks(struct omap_hwmod *oh)
980{
981 struct omap_hwmod_ocp_if *os;
982
983 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
984
985 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
986 _enable_optional_clocks(oh);
987
988 if (oh->_clk)
989 clk_enable(oh->_clk);
990
991 list_for_each_entry(os, &oh->slave_ports, node) {
992 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
993 omap2_clk_deny_idle(os->_clk);
994 clk_enable(os->_clk);
995 }
996 }
997
998 /* The opt clocks are controlled by the device driver. */
999
1000 return 0;
1001}
1002
1003/**
1004 * _omap4_clkctrl_managed_by_clkfwk - true if clkctrl managed by clock framework
1005 * @oh: struct omap_hwmod *
1006 */
1007static bool _omap4_clkctrl_managed_by_clkfwk(struct omap_hwmod *oh)
1008{
1009 if (oh->prcm.omap4.flags & HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK)
1010 return true;
1011
1012 return false;
1013}
1014
1015/**
1016 * _omap4_has_clkctrl_clock - returns true if a module has clkctrl clock
1017 * @oh: struct omap_hwmod *
1018 */
1019static bool _omap4_has_clkctrl_clock(struct omap_hwmod *oh)
1020{
1021 if (oh->prcm.omap4.clkctrl_offs)
1022 return true;
1023
1024 if (!oh->prcm.omap4.clkctrl_offs &&
1025 oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET)
1026 return true;
1027
1028 return false;
1029}
1030
1031/**
1032 * _disable_clocks - disable hwmod main clock and interface clocks
1033 * @oh: struct omap_hwmod *
1034 *
1035 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
1036 */
1037static int _disable_clocks(struct omap_hwmod *oh)
1038{
1039 struct omap_hwmod_ocp_if *os;
1040
1041 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
1042
1043 if (oh->_clk)
1044 clk_disable(oh->_clk);
1045
1046 list_for_each_entry(os, &oh->slave_ports, node) {
1047 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
1048 clk_disable(os->_clk);
1049 omap2_clk_allow_idle(os->_clk);
1050 }
1051 }
1052
1053 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
1054 _disable_optional_clocks(oh);
1055
1056 /* The opt clocks are controlled by the device driver. */
1057
1058 return 0;
1059}
1060
1061/**
1062 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
1063 * @oh: struct omap_hwmod *
1064 *
1065 * Enables the PRCM module mode related to the hwmod @oh.
1066 * No return value.
1067 */
1068static void _omap4_enable_module(struct omap_hwmod *oh)
1069{
1070 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1071 _omap4_clkctrl_managed_by_clkfwk(oh))
1072 return;
1073
1074 pr_debug("omap_hwmod: %s: %s: %d\n",
1075 oh->name, __func__, oh->prcm.omap4.modulemode);
1076
1077 omap_cm_module_enable(oh->prcm.omap4.modulemode,
1078 oh->clkdm->prcm_partition,
1079 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
1080}
1081
1082/**
1083 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
1084 * @oh: struct omap_hwmod *
1085 *
1086 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1087 * does not have an IDLEST bit or if the module successfully enters
1088 * slave idle; otherwise, pass along the return value of the
1089 * appropriate *_cm*_wait_module_idle() function.
1090 */
1091static int _omap4_wait_target_disable(struct omap_hwmod *oh)
1092{
1093 if (!oh)
1094 return -EINVAL;
1095
1096 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1097 return 0;
1098
1099 if (oh->flags & HWMOD_NO_IDLEST)
1100 return 0;
1101
1102 if (_omap4_clkctrl_managed_by_clkfwk(oh))
1103 return 0;
1104
1105 if (!_omap4_has_clkctrl_clock(oh))
1106 return 0;
1107
1108 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1109 oh->clkdm->cm_inst,
1110 oh->prcm.omap4.clkctrl_offs, 0);
1111}
1112
1113/**
1114 * _save_mpu_port_index - find and save the index to @oh's MPU port
1115 * @oh: struct omap_hwmod *
1116 *
1117 * Determines the array index of the OCP slave port that the MPU uses
1118 * to address the device, and saves it into the struct omap_hwmod.
1119 * Intended to be called during hwmod registration only. No return
1120 * value.
1121 */
1122static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1123{
1124 struct omap_hwmod_ocp_if *os = NULL;
1125
1126 if (!oh)
1127 return;
1128
1129 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1130
1131 list_for_each_entry(os, &oh->slave_ports, node) {
1132 if (os->user & OCP_USER_MPU) {
1133 oh->_mpu_port = os;
1134 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1135 break;
1136 }
1137 }
1138
1139 return;
1140}
1141
1142/**
1143 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1144 * @oh: struct omap_hwmod *
1145 *
1146 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1147 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1148 * communicate with the IP block. This interface need not be directly
1149 * connected to the MPU (and almost certainly is not), but is directly
1150 * connected to the IP block represented by @oh. Returns a pointer
1151 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1152 * error or if there does not appear to be a path from the MPU to this
1153 * IP block.
1154 */
1155static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1156{
1157 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1158 return NULL;
1159
1160 return oh->_mpu_port;
1161};
1162
1163/**
1164 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1165 * @oh: struct omap_hwmod *
1166 *
1167 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1168 * by @oh is set to indicate to the PRCM that the IP block is active.
1169 * Usually this means placing the module into smart-idle mode and
1170 * smart-standby, but if there is a bug in the automatic idle handling
1171 * for the IP block, it may need to be placed into the force-idle or
1172 * no-idle variants of these modes. No return value.
1173 */
1174static void _enable_sysc(struct omap_hwmod *oh)
1175{
1176 u8 idlemode, sf;
1177 u32 v;
1178 bool clkdm_act;
1179 struct clockdomain *clkdm;
1180
1181 if (!oh->class->sysc)
1182 return;
1183
1184 /*
1185 * Wait until reset has completed, this is needed as the IP
1186 * block is reset automatically by hardware in some cases
1187 * (off-mode for example), and the drivers require the
1188 * IP to be ready when they access it
1189 */
1190 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1191 _enable_optional_clocks(oh);
1192 _wait_softreset_complete(oh);
1193 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1194 _disable_optional_clocks(oh);
1195
1196 v = oh->_sysc_cache;
1197 sf = oh->class->sysc->sysc_flags;
1198
1199 clkdm = _get_clkdm(oh);
1200 if (sf & SYSC_HAS_SIDLEMODE) {
1201 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1202 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1203 idlemode = HWMOD_IDLEMODE_NO;
1204 } else {
1205 if (sf & SYSC_HAS_ENAWAKEUP)
1206 _enable_wakeup(oh, &v);
1207 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1208 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1209 else
1210 idlemode = HWMOD_IDLEMODE_SMART;
1211 }
1212
1213 /*
1214 * This is special handling for some IPs like
1215 * 32k sync timer. Force them to idle!
1216 */
1217 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1218 if (clkdm_act && !(oh->class->sysc->idlemodes &
1219 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1220 idlemode = HWMOD_IDLEMODE_FORCE;
1221
1222 _set_slave_idlemode(oh, idlemode, &v);
1223 }
1224
1225 if (sf & SYSC_HAS_MIDLEMODE) {
1226 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1227 idlemode = HWMOD_IDLEMODE_FORCE;
1228 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1229 idlemode = HWMOD_IDLEMODE_NO;
1230 } else {
1231 if (sf & SYSC_HAS_ENAWAKEUP)
1232 _enable_wakeup(oh, &v);
1233 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1234 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1235 else
1236 idlemode = HWMOD_IDLEMODE_SMART;
1237 }
1238 _set_master_standbymode(oh, idlemode, &v);
1239 }
1240
1241 /*
1242 * XXX The clock framework should handle this, by
1243 * calling into this code. But this must wait until the
1244 * clock structures are tagged with omap_hwmod entries
1245 */
1246 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1247 (sf & SYSC_HAS_CLOCKACTIVITY))
1248 _set_clockactivity(oh, CLOCKACT_TEST_ICLK, &v);
1249
1250 _write_sysconfig(v, oh);
1251
1252 /*
1253 * Set the autoidle bit only after setting the smartidle bit
1254 * Setting this will not have any impact on the other modules.
1255 */
1256 if (sf & SYSC_HAS_AUTOIDLE) {
1257 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1258 0 : 1;
1259 _set_module_autoidle(oh, idlemode, &v);
1260 _write_sysconfig(v, oh);
1261 }
1262}
1263
1264/**
1265 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1266 * @oh: struct omap_hwmod *
1267 *
1268 * If module is marked as SWSUP_SIDLE, force the module into slave
1269 * idle; otherwise, configure it for smart-idle. If module is marked
1270 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1271 * configure it for smart-standby. No return value.
1272 */
1273static void _idle_sysc(struct omap_hwmod *oh)
1274{
1275 u8 idlemode, sf;
1276 u32 v;
1277
1278 if (!oh->class->sysc)
1279 return;
1280
1281 v = oh->_sysc_cache;
1282 sf = oh->class->sysc->sysc_flags;
1283
1284 if (sf & SYSC_HAS_SIDLEMODE) {
1285 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1286 idlemode = HWMOD_IDLEMODE_FORCE;
1287 } else {
1288 if (sf & SYSC_HAS_ENAWAKEUP)
1289 _enable_wakeup(oh, &v);
1290 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1291 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1292 else
1293 idlemode = HWMOD_IDLEMODE_SMART;
1294 }
1295 _set_slave_idlemode(oh, idlemode, &v);
1296 }
1297
1298 if (sf & SYSC_HAS_MIDLEMODE) {
1299 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1300 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1301 idlemode = HWMOD_IDLEMODE_FORCE;
1302 } else {
1303 if (sf & SYSC_HAS_ENAWAKEUP)
1304 _enable_wakeup(oh, &v);
1305 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1306 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1307 else
1308 idlemode = HWMOD_IDLEMODE_SMART;
1309 }
1310 _set_master_standbymode(oh, idlemode, &v);
1311 }
1312
1313 /* If the cached value is the same as the new value, skip the write */
1314 if (oh->_sysc_cache != v)
1315 _write_sysconfig(v, oh);
1316}
1317
1318/**
1319 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1320 * @oh: struct omap_hwmod *
1321 *
1322 * Force the module into slave idle and master suspend. No return
1323 * value.
1324 */
1325static void _shutdown_sysc(struct omap_hwmod *oh)
1326{
1327 u32 v;
1328 u8 sf;
1329
1330 if (!oh->class->sysc)
1331 return;
1332
1333 v = oh->_sysc_cache;
1334 sf = oh->class->sysc->sysc_flags;
1335
1336 if (sf & SYSC_HAS_SIDLEMODE)
1337 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1338
1339 if (sf & SYSC_HAS_MIDLEMODE)
1340 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1341
1342 if (sf & SYSC_HAS_AUTOIDLE)
1343 _set_module_autoidle(oh, 1, &v);
1344
1345 _write_sysconfig(v, oh);
1346}
1347
1348/**
1349 * _lookup - find an omap_hwmod by name
1350 * @name: find an omap_hwmod by name
1351 *
1352 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1353 */
1354static struct omap_hwmod *_lookup(const char *name)
1355{
1356 struct omap_hwmod *oh, *temp_oh;
1357
1358 oh = NULL;
1359
1360 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1361 if (!strcmp(name, temp_oh->name)) {
1362 oh = temp_oh;
1363 break;
1364 }
1365 }
1366
1367 return oh;
1368}
1369
1370/**
1371 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1372 * @oh: struct omap_hwmod *
1373 *
1374 * Convert a clockdomain name stored in a struct omap_hwmod into a
1375 * clockdomain pointer, and save it into the struct omap_hwmod.
1376 * Return -EINVAL if the clkdm_name lookup failed.
1377 */
1378static int _init_clkdm(struct omap_hwmod *oh)
1379{
1380 if (!oh->clkdm_name) {
1381 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1382 return 0;
1383 }
1384
1385 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1386 if (!oh->clkdm) {
1387 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1388 oh->name, oh->clkdm_name);
1389 return 0;
1390 }
1391
1392 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1393 oh->name, oh->clkdm_name);
1394
1395 return 0;
1396}
1397
1398/**
1399 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1400 * well the clockdomain.
1401 * @oh: struct omap_hwmod *
1402 * @np: device_node mapped to this hwmod
1403 *
1404 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1405 * Resolves all clock names embedded in the hwmod. Returns 0 on
1406 * success, or a negative error code on failure.
1407 */
1408static int _init_clocks(struct omap_hwmod *oh, struct device_node *np)
1409{
1410 int ret = 0;
1411
1412 if (oh->_state != _HWMOD_STATE_REGISTERED)
1413 return 0;
1414
1415 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1416
1417 if (soc_ops.init_clkdm)
1418 ret |= soc_ops.init_clkdm(oh);
1419
1420 ret |= _init_main_clk(oh);
1421 ret |= _init_interface_clks(oh);
1422 ret |= _init_opt_clks(oh);
1423
1424 if (!ret)
1425 oh->_state = _HWMOD_STATE_CLKS_INITED;
1426 else
1427 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1428
1429 return ret;
1430}
1431
1432/**
1433 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1434 * @oh: struct omap_hwmod *
1435 * @name: name of the reset line in the context of this hwmod
1436 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1437 *
1438 * Return the bit position of the reset line that match the
1439 * input name. Return -ENOENT if not found.
1440 */
1441static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1442 struct omap_hwmod_rst_info *ohri)
1443{
1444 int i;
1445
1446 for (i = 0; i < oh->rst_lines_cnt; i++) {
1447 const char *rst_line = oh->rst_lines[i].name;
1448 if (!strcmp(rst_line, name)) {
1449 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1450 ohri->st_shift = oh->rst_lines[i].st_shift;
1451 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1452 oh->name, __func__, rst_line, ohri->rst_shift,
1453 ohri->st_shift);
1454
1455 return 0;
1456 }
1457 }
1458
1459 return -ENOENT;
1460}
1461
1462/**
1463 * _assert_hardreset - assert the HW reset line of submodules
1464 * contained in the hwmod module.
1465 * @oh: struct omap_hwmod *
1466 * @name: name of the reset line to lookup and assert
1467 *
1468 * Some IP like dsp, ipu or iva contain processor that require an HW
1469 * reset line to be assert / deassert in order to enable fully the IP.
1470 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1471 * asserting the hardreset line on the currently-booted SoC, or passes
1472 * along the return value from _lookup_hardreset() or the SoC's
1473 * assert_hardreset code.
1474 */
1475static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1476{
1477 struct omap_hwmod_rst_info ohri;
1478 int ret = -EINVAL;
1479
1480 if (!oh)
1481 return -EINVAL;
1482
1483 if (!soc_ops.assert_hardreset)
1484 return -ENOSYS;
1485
1486 ret = _lookup_hardreset(oh, name, &ohri);
1487 if (ret < 0)
1488 return ret;
1489
1490 ret = soc_ops.assert_hardreset(oh, &ohri);
1491
1492 return ret;
1493}
1494
1495/**
1496 * _deassert_hardreset - deassert the HW reset line of submodules contained
1497 * in the hwmod module.
1498 * @oh: struct omap_hwmod *
1499 * @name: name of the reset line to look up and deassert
1500 *
1501 * Some IP like dsp, ipu or iva contain processor that require an HW
1502 * reset line to be assert / deassert in order to enable fully the IP.
1503 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1504 * deasserting the hardreset line on the currently-booted SoC, or passes
1505 * along the return value from _lookup_hardreset() or the SoC's
1506 * deassert_hardreset code.
1507 */
1508static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1509{
1510 struct omap_hwmod_rst_info ohri;
1511 int ret = -EINVAL;
1512
1513 if (!oh)
1514 return -EINVAL;
1515
1516 if (!soc_ops.deassert_hardreset)
1517 return -ENOSYS;
1518
1519 ret = _lookup_hardreset(oh, name, &ohri);
1520 if (ret < 0)
1521 return ret;
1522
1523 if (oh->clkdm) {
1524 /*
1525 * A clockdomain must be in SW_SUP otherwise reset
1526 * might not be completed. The clockdomain can be set
1527 * in HW_AUTO only when the module become ready.
1528 */
1529 clkdm_deny_idle(oh->clkdm);
1530 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1531 if (ret) {
1532 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1533 oh->name, oh->clkdm->name, ret);
1534 return ret;
1535 }
1536 }
1537
1538 _enable_clocks(oh);
1539 if (soc_ops.enable_module)
1540 soc_ops.enable_module(oh);
1541
1542 ret = soc_ops.deassert_hardreset(oh, &ohri);
1543
1544 if (soc_ops.disable_module)
1545 soc_ops.disable_module(oh);
1546 _disable_clocks(oh);
1547
1548 if (ret == -EBUSY)
1549 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1550
1551 if (oh->clkdm) {
1552 /*
1553 * Set the clockdomain to HW_AUTO, assuming that the
1554 * previous state was HW_AUTO.
1555 */
1556 clkdm_allow_idle(oh->clkdm);
1557
1558 clkdm_hwmod_disable(oh->clkdm, oh);
1559 }
1560
1561 return ret;
1562}
1563
1564/**
1565 * _read_hardreset - read the HW reset line state of submodules
1566 * contained in the hwmod module
1567 * @oh: struct omap_hwmod *
1568 * @name: name of the reset line to look up and read
1569 *
1570 * Return the state of the reset line. Returns -EINVAL if @oh is
1571 * null, -ENOSYS if we have no way of reading the hardreset line
1572 * status on the currently-booted SoC, or passes along the return
1573 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1574 * code.
1575 */
1576static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1577{
1578 struct omap_hwmod_rst_info ohri;
1579 int ret = -EINVAL;
1580
1581 if (!oh)
1582 return -EINVAL;
1583
1584 if (!soc_ops.is_hardreset_asserted)
1585 return -ENOSYS;
1586
1587 ret = _lookup_hardreset(oh, name, &ohri);
1588 if (ret < 0)
1589 return ret;
1590
1591 return soc_ops.is_hardreset_asserted(oh, &ohri);
1592}
1593
1594/**
1595 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1596 * @oh: struct omap_hwmod *
1597 *
1598 * If all hardreset lines associated with @oh are asserted, then return true.
1599 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1600 * associated with @oh are asserted, then return false.
1601 * This function is used to avoid executing some parts of the IP block
1602 * enable/disable sequence if its hardreset line is set.
1603 */
1604static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1605{
1606 int i, rst_cnt = 0;
1607
1608 if (oh->rst_lines_cnt == 0)
1609 return false;
1610
1611 for (i = 0; i < oh->rst_lines_cnt; i++)
1612 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1613 rst_cnt++;
1614
1615 if (oh->rst_lines_cnt == rst_cnt)
1616 return true;
1617
1618 return false;
1619}
1620
1621/**
1622 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1623 * hard-reset
1624 * @oh: struct omap_hwmod *
1625 *
1626 * If any hardreset lines associated with @oh are asserted, then
1627 * return true. Otherwise, if no hardreset lines associated with @oh
1628 * are asserted, or if @oh has no hardreset lines, then return false.
1629 * This function is used to avoid executing some parts of the IP block
1630 * enable/disable sequence if any hardreset line is set.
1631 */
1632static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1633{
1634 int rst_cnt = 0;
1635 int i;
1636
1637 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1638 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1639 rst_cnt++;
1640
1641 return (rst_cnt) ? true : false;
1642}
1643
1644/**
1645 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1646 * @oh: struct omap_hwmod *
1647 *
1648 * Disable the PRCM module mode related to the hwmod @oh.
1649 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1650 */
1651static int _omap4_disable_module(struct omap_hwmod *oh)
1652{
1653 int v;
1654
1655 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1656 _omap4_clkctrl_managed_by_clkfwk(oh))
1657 return -EINVAL;
1658
1659 /*
1660 * Since integration code might still be doing something, only
1661 * disable if all lines are under hardreset.
1662 */
1663 if (_are_any_hardreset_lines_asserted(oh))
1664 return 0;
1665
1666 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1667
1668 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1669 oh->prcm.omap4.clkctrl_offs);
1670
1671 v = _omap4_wait_target_disable(oh);
1672 if (v)
1673 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1674 oh->name);
1675
1676 return 0;
1677}
1678
1679/**
1680 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1681 * @oh: struct omap_hwmod *
1682 *
1683 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1684 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1685 * reset this way, -EINVAL if the hwmod is in the wrong state,
1686 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1687 *
1688 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1689 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1690 * use the SYSCONFIG softreset bit to provide the status.
1691 *
1692 * Note that some IP like McBSP do have reset control but don't have
1693 * reset status.
1694 */
1695static int _ocp_softreset(struct omap_hwmod *oh)
1696{
1697 u32 v;
1698 int c = 0;
1699 int ret = 0;
1700
1701 if (!oh->class->sysc ||
1702 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1703 return -ENOENT;
1704
1705 /* clocks must be on for this operation */
1706 if (oh->_state != _HWMOD_STATE_ENABLED) {
1707 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1708 oh->name);
1709 return -EINVAL;
1710 }
1711
1712 /* For some modules, all optionnal clocks need to be enabled as well */
1713 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1714 _enable_optional_clocks(oh);
1715
1716 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1717
1718 v = oh->_sysc_cache;
1719 ret = _set_softreset(oh, &v);
1720 if (ret)
1721 goto dis_opt_clks;
1722
1723 _write_sysconfig(v, oh);
1724
1725 if (oh->class->sysc->srst_udelay)
1726 udelay(oh->class->sysc->srst_udelay);
1727
1728 c = _wait_softreset_complete(oh);
1729 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1730 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1731 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1732 ret = -ETIMEDOUT;
1733 goto dis_opt_clks;
1734 } else {
1735 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1736 }
1737
1738 ret = _clear_softreset(oh, &v);
1739 if (ret)
1740 goto dis_opt_clks;
1741
1742 _write_sysconfig(v, oh);
1743
1744 /*
1745 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1746 * _wait_target_ready() or _reset()
1747 */
1748
1749dis_opt_clks:
1750 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1751 _disable_optional_clocks(oh);
1752
1753 return ret;
1754}
1755
1756/**
1757 * _reset - reset an omap_hwmod
1758 * @oh: struct omap_hwmod *
1759 *
1760 * Resets an omap_hwmod @oh. If the module has a custom reset
1761 * function pointer defined, then call it to reset the IP block, and
1762 * pass along its return value to the caller. Otherwise, if the IP
1763 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1764 * associated with it, call a function to reset the IP block via that
1765 * method, and pass along the return value to the caller. Finally, if
1766 * the IP block has some hardreset lines associated with it, assert
1767 * all of those, but do _not_ deassert them. (This is because driver
1768 * authors have expressed an apparent requirement to control the
1769 * deassertion of the hardreset lines themselves.)
1770 *
1771 * The default software reset mechanism for most OMAP IP blocks is
1772 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1773 * hwmods cannot be reset via this method. Some are not targets and
1774 * therefore have no OCP header registers to access. Others (like the
1775 * IVA) have idiosyncratic reset sequences. So for these relatively
1776 * rare cases, custom reset code can be supplied in the struct
1777 * omap_hwmod_class .reset function pointer.
1778 *
1779 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1780 * does not prevent idling of the system. This is necessary for cases
1781 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1782 * kernel without disabling dma.
1783 *
1784 * Passes along the return value from either _ocp_softreset() or the
1785 * custom reset function - these must return -EINVAL if the hwmod
1786 * cannot be reset this way or if the hwmod is in the wrong state,
1787 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1788 */
1789static int _reset(struct omap_hwmod *oh)
1790{
1791 int i, r;
1792
1793 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1794
1795 if (oh->class->reset) {
1796 r = oh->class->reset(oh);
1797 } else {
1798 if (oh->rst_lines_cnt > 0) {
1799 for (i = 0; i < oh->rst_lines_cnt; i++)
1800 _assert_hardreset(oh, oh->rst_lines[i].name);
1801 return 0;
1802 } else {
1803 r = _ocp_softreset(oh);
1804 if (r == -ENOENT)
1805 r = 0;
1806 }
1807 }
1808
1809 _set_dmadisable(oh);
1810
1811 /*
1812 * OCP_SYSCONFIG bits need to be reprogrammed after a
1813 * softreset. The _enable() function should be split to avoid
1814 * the rewrite of the OCP_SYSCONFIG register.
1815 */
1816 if (oh->class->sysc) {
1817 _update_sysc_cache(oh);
1818 _enable_sysc(oh);
1819 }
1820
1821 return r;
1822}
1823
1824/**
1825 * _omap4_update_context_lost - increment hwmod context loss counter if
1826 * hwmod context was lost, and clear hardware context loss reg
1827 * @oh: hwmod to check for context loss
1828 *
1829 * If the PRCM indicates that the hwmod @oh lost context, increment
1830 * our in-memory context loss counter, and clear the RM_*_CONTEXT
1831 * bits. No return value.
1832 */
1833static void _omap4_update_context_lost(struct omap_hwmod *oh)
1834{
1835 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
1836 return;
1837
1838 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1839 oh->clkdm->pwrdm.ptr->prcm_offs,
1840 oh->prcm.omap4.context_offs))
1841 return;
1842
1843 oh->prcm.omap4.context_lost_counter++;
1844 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1845 oh->clkdm->pwrdm.ptr->prcm_offs,
1846 oh->prcm.omap4.context_offs);
1847}
1848
1849/**
1850 * _omap4_get_context_lost - get context loss counter for a hwmod
1851 * @oh: hwmod to get context loss counter for
1852 *
1853 * Returns the in-memory context loss counter for a hwmod.
1854 */
1855static int _omap4_get_context_lost(struct omap_hwmod *oh)
1856{
1857 return oh->prcm.omap4.context_lost_counter;
1858}
1859
1860/**
1861 * _enable - enable an omap_hwmod
1862 * @oh: struct omap_hwmod *
1863 *
1864 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1865 * register target. Returns -EINVAL if the hwmod is in the wrong
1866 * state or passes along the return value of _wait_target_ready().
1867 */
1868static int _enable(struct omap_hwmod *oh)
1869{
1870 int r;
1871
1872 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1873
1874 /*
1875 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1876 * state at init.
1877 */
1878 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
1879 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
1880 return 0;
1881 }
1882
1883 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1884 oh->_state != _HWMOD_STATE_IDLE &&
1885 oh->_state != _HWMOD_STATE_DISABLED) {
1886 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
1887 oh->name);
1888 return -EINVAL;
1889 }
1890
1891 /*
1892 * If an IP block contains HW reset lines and all of them are
1893 * asserted, we let integration code associated with that
1894 * block handle the enable. We've received very little
1895 * information on what those driver authors need, and until
1896 * detailed information is provided and the driver code is
1897 * posted to the public lists, this is probably the best we
1898 * can do.
1899 */
1900 if (_are_all_hardreset_lines_asserted(oh))
1901 return 0;
1902
1903 _add_initiator_dep(oh, mpu_oh);
1904
1905 if (oh->clkdm) {
1906 /*
1907 * A clockdomain must be in SW_SUP before enabling
1908 * completely the module. The clockdomain can be set
1909 * in HW_AUTO only when the module become ready.
1910 */
1911 clkdm_deny_idle(oh->clkdm);
1912 r = clkdm_hwmod_enable(oh->clkdm, oh);
1913 if (r) {
1914 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1915 oh->name, oh->clkdm->name, r);
1916 return r;
1917 }
1918 }
1919
1920 _enable_clocks(oh);
1921 if (soc_ops.enable_module)
1922 soc_ops.enable_module(oh);
1923 if (oh->flags & HWMOD_BLOCK_WFI)
1924 cpu_idle_poll_ctrl(true);
1925
1926 if (soc_ops.update_context_lost)
1927 soc_ops.update_context_lost(oh);
1928
1929 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
1930 -EINVAL;
1931 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
1932 clkdm_allow_idle(oh->clkdm);
1933
1934 if (!r) {
1935 oh->_state = _HWMOD_STATE_ENABLED;
1936
1937 /* Access the sysconfig only if the target is ready */
1938 if (oh->class->sysc) {
1939 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1940 _update_sysc_cache(oh);
1941 _enable_sysc(oh);
1942 }
1943 } else {
1944 if (soc_ops.disable_module)
1945 soc_ops.disable_module(oh);
1946 _disable_clocks(oh);
1947 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
1948 oh->name, r);
1949
1950 if (oh->clkdm)
1951 clkdm_hwmod_disable(oh->clkdm, oh);
1952 }
1953
1954 return r;
1955}
1956
1957/**
1958 * _idle - idle an omap_hwmod
1959 * @oh: struct omap_hwmod *
1960 *
1961 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1962 * no further work. Returns -EINVAL if the hwmod is in the wrong
1963 * state or returns 0.
1964 */
1965static int _idle(struct omap_hwmod *oh)
1966{
1967 if (oh->flags & HWMOD_NO_IDLE) {
1968 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
1969 return 0;
1970 }
1971
1972 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1973
1974 if (_are_all_hardreset_lines_asserted(oh))
1975 return 0;
1976
1977 if (oh->_state != _HWMOD_STATE_ENABLED) {
1978 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
1979 oh->name);
1980 return -EINVAL;
1981 }
1982
1983 if (oh->class->sysc)
1984 _idle_sysc(oh);
1985 _del_initiator_dep(oh, mpu_oh);
1986
1987 /*
1988 * If HWMOD_CLKDM_NOAUTO is set then we don't
1989 * deny idle the clkdm again since idle was already denied
1990 * in _enable()
1991 */
1992 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
1993 clkdm_deny_idle(oh->clkdm);
1994
1995 if (oh->flags & HWMOD_BLOCK_WFI)
1996 cpu_idle_poll_ctrl(false);
1997 if (soc_ops.disable_module)
1998 soc_ops.disable_module(oh);
1999
2000 /*
2001 * The module must be in idle mode before disabling any parents
2002 * clocks. Otherwise, the parent clock might be disabled before
2003 * the module transition is done, and thus will prevent the
2004 * transition to complete properly.
2005 */
2006 _disable_clocks(oh);
2007 if (oh->clkdm) {
2008 clkdm_allow_idle(oh->clkdm);
2009 clkdm_hwmod_disable(oh->clkdm, oh);
2010 }
2011
2012 oh->_state = _HWMOD_STATE_IDLE;
2013
2014 return 0;
2015}
2016
2017/**
2018 * _shutdown - shutdown an omap_hwmod
2019 * @oh: struct omap_hwmod *
2020 *
2021 * Shut down an omap_hwmod @oh. This should be called when the driver
2022 * used for the hwmod is removed or unloaded or if the driver is not
2023 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2024 * state or returns 0.
2025 */
2026static int _shutdown(struct omap_hwmod *oh)
2027{
2028 int ret, i;
2029 u8 prev_state;
2030
2031 if (_are_all_hardreset_lines_asserted(oh))
2032 return 0;
2033
2034 if (oh->_state != _HWMOD_STATE_IDLE &&
2035 oh->_state != _HWMOD_STATE_ENABLED) {
2036 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2037 oh->name);
2038 return -EINVAL;
2039 }
2040
2041 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2042
2043 if (oh->class->pre_shutdown) {
2044 prev_state = oh->_state;
2045 if (oh->_state == _HWMOD_STATE_IDLE)
2046 _enable(oh);
2047 ret = oh->class->pre_shutdown(oh);
2048 if (ret) {
2049 if (prev_state == _HWMOD_STATE_IDLE)
2050 _idle(oh);
2051 return ret;
2052 }
2053 }
2054
2055 if (oh->class->sysc) {
2056 if (oh->_state == _HWMOD_STATE_IDLE)
2057 _enable(oh);
2058 _shutdown_sysc(oh);
2059 }
2060
2061 /* clocks and deps are already disabled in idle */
2062 if (oh->_state == _HWMOD_STATE_ENABLED) {
2063 _del_initiator_dep(oh, mpu_oh);
2064 /* XXX what about the other system initiators here? dma, dsp */
2065 if (oh->flags & HWMOD_BLOCK_WFI)
2066 cpu_idle_poll_ctrl(false);
2067 if (soc_ops.disable_module)
2068 soc_ops.disable_module(oh);
2069 _disable_clocks(oh);
2070 if (oh->clkdm)
2071 clkdm_hwmod_disable(oh->clkdm, oh);
2072 }
2073 /* XXX Should this code also force-disable the optional clocks? */
2074
2075 for (i = 0; i < oh->rst_lines_cnt; i++)
2076 _assert_hardreset(oh, oh->rst_lines[i].name);
2077
2078 oh->_state = _HWMOD_STATE_DISABLED;
2079
2080 return 0;
2081}
2082
2083static int of_dev_find_hwmod(struct device_node *np,
2084 struct omap_hwmod *oh)
2085{
2086 int count, i, res;
2087 const char *p;
2088
2089 count = of_property_count_strings(np, "ti,hwmods");
2090 if (count < 1)
2091 return -ENODEV;
2092
2093 for (i = 0; i < count; i++) {
2094 res = of_property_read_string_index(np, "ti,hwmods",
2095 i, &p);
2096 if (res)
2097 continue;
2098 if (!strcmp(p, oh->name)) {
2099 pr_debug("omap_hwmod: dt %pOFn[%i] uses hwmod %s\n",
2100 np, i, oh->name);
2101 return i;
2102 }
2103 }
2104
2105 return -ENODEV;
2106}
2107
2108/**
2109 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2110 * @np: struct device_node *
2111 * @oh: struct omap_hwmod *
2112 * @index: index of the entry found
2113 * @found: struct device_node * found or NULL
2114 *
2115 * Parse the dt blob and find out needed hwmod. Recursive function is
2116 * implemented to take care hierarchical dt blob parsing.
2117 * Return: Returns 0 on success, -ENODEV when not found.
2118 */
2119static int of_dev_hwmod_lookup(struct device_node *np,
2120 struct omap_hwmod *oh,
2121 int *index,
2122 struct device_node **found)
2123{
2124 struct device_node *np0 = NULL;
2125 int res;
2126
2127 res = of_dev_find_hwmod(np, oh);
2128 if (res >= 0) {
2129 *found = np;
2130 *index = res;
2131 return 0;
2132 }
2133
2134 for_each_child_of_node(np, np0) {
2135 struct device_node *fc;
2136 int i;
2137
2138 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2139 if (res == 0) {
2140 *found = fc;
2141 *index = i;
2142 of_node_put(np0);
2143 return 0;
2144 }
2145 }
2146
2147 *found = NULL;
2148 *index = 0;
2149
2150 return -ENODEV;
2151}
2152
2153/**
2154 * omap_hwmod_fix_mpu_rt_idx - fix up mpu_rt_idx register offsets
2155 *
2156 * @oh: struct omap_hwmod *
2157 * @np: struct device_node *
2158 *
2159 * Fix up module register offsets for modules with mpu_rt_idx.
2160 * Only needed for cpsw with interconnect target module defined
2161 * in device tree while still using legacy hwmod platform data
2162 * for rev, sysc and syss registers.
2163 *
2164 * Can be removed when all cpsw hwmod platform data has been
2165 * dropped.
2166 */
2167static void omap_hwmod_fix_mpu_rt_idx(struct omap_hwmod *oh,
2168 struct device_node *np,
2169 struct resource *res)
2170{
2171 struct device_node *child = NULL;
2172 int error;
2173
2174 child = of_get_next_child(np, child);
2175 if (!child)
2176 return;
2177
2178 error = of_address_to_resource(child, oh->mpu_rt_idx, res);
2179 if (error)
2180 pr_err("%s: error mapping mpu_rt_idx: %i\n",
2181 __func__, error);
2182}
2183
2184/**
2185 * omap_hwmod_parse_module_range - map module IO range from device tree
2186 * @oh: struct omap_hwmod *
2187 * @np: struct device_node *
2188 *
2189 * Parse the device tree range an interconnect target module provides
2190 * for it's child device IP blocks. This way we can support the old
2191 * "ti,hwmods" property with just dts data without a need for platform
2192 * data for IO resources. And we don't need all the child IP device
2193 * nodes available in the dts.
2194 */
2195int omap_hwmod_parse_module_range(struct omap_hwmod *oh,
2196 struct device_node *np,
2197 struct resource *res)
2198{
2199 struct property *prop;
2200 const __be32 *ranges;
2201 const char *name;
2202 u32 nr_addr, nr_size;
2203 u64 base, size;
2204 int len, error;
2205
2206 if (!res)
2207 return -EINVAL;
2208
2209 ranges = of_get_property(np, "ranges", &len);
2210 if (!ranges)
2211 return -ENOENT;
2212
2213 len /= sizeof(*ranges);
2214
2215 if (len < 3)
2216 return -EINVAL;
2217
2218 of_property_for_each_string(np, "compatible", prop, name)
2219 if (!strncmp("ti,sysc-", name, 8))
2220 break;
2221
2222 if (!name)
2223 return -ENOENT;
2224
2225 error = of_property_read_u32(np, "#address-cells", &nr_addr);
2226 if (error)
2227 return -ENOENT;
2228
2229 error = of_property_read_u32(np, "#size-cells", &nr_size);
2230 if (error)
2231 return -ENOENT;
2232
2233 if (nr_addr != 1 || nr_size != 1) {
2234 pr_err("%s: invalid range for %s->%pOFn\n", __func__,
2235 oh->name, np);
2236 return -EINVAL;
2237 }
2238
2239 ranges++;
2240 base = of_translate_address(np, ranges++);
2241 size = be32_to_cpup(ranges);
2242
2243 pr_debug("omap_hwmod: %s %pOFn at 0x%llx size 0x%llx\n",
2244 oh->name, np, base, size);
2245
2246 if (oh && oh->mpu_rt_idx) {
2247 omap_hwmod_fix_mpu_rt_idx(oh, np, res);
2248
2249 return 0;
2250 }
2251
2252 res->start = base;
2253 res->end = base + size - 1;
2254 res->flags = IORESOURCE_MEM;
2255
2256 return 0;
2257}
2258
2259/**
2260 * _init_mpu_rt_base - populate the virtual address for a hwmod
2261 * @oh: struct omap_hwmod * to locate the virtual address
2262 * @data: (unused, caller should pass NULL)
2263 * @index: index of the reg entry iospace in device tree
2264 * @np: struct device_node * of the IP block's device node in the DT data
2265 *
2266 * Cache the virtual address used by the MPU to access this IP block's
2267 * registers. This address is needed early so the OCP registers that
2268 * are part of the device's address space can be ioremapped properly.
2269 *
2270 * If SYSC access is not needed, the registers will not be remapped
2271 * and non-availability of MPU access is not treated as an error.
2272 *
2273 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2274 * -ENXIO on absent or invalid register target address space.
2275 */
2276static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2277 int index, struct device_node *np)
2278{
2279 void __iomem *va_start = NULL;
2280 struct resource res;
2281 int error;
2282
2283 if (!oh)
2284 return -EINVAL;
2285
2286 _save_mpu_port_index(oh);
2287
2288 /* if we don't need sysc access we don't need to ioremap */
2289 if (!oh->class->sysc)
2290 return 0;
2291
2292 /* we can't continue without MPU PORT if we need sysc access */
2293 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2294 return -ENXIO;
2295
2296 if (!np) {
2297 pr_err("omap_hwmod: %s: no dt node\n", oh->name);
2298 return -ENXIO;
2299 }
2300
2301 /* Do we have a dts range for the interconnect target module? */
2302 error = omap_hwmod_parse_module_range(oh, np, &res);
2303 if (!error)
2304 va_start = ioremap(res.start, resource_size(&res));
2305
2306 /* No ranges, rely on device reg entry */
2307 if (!va_start)
2308 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2309 if (!va_start) {
2310 pr_err("omap_hwmod: %s: Missing dt reg%i for %pOF\n",
2311 oh->name, index, np);
2312 return -ENXIO;
2313 }
2314
2315 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2316 oh->name, va_start);
2317
2318 oh->_mpu_rt_va = va_start;
2319 return 0;
2320}
2321
2322static void __init parse_module_flags(struct omap_hwmod *oh,
2323 struct device_node *np)
2324{
2325 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2326 oh->flags |= HWMOD_INIT_NO_RESET;
2327 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2328 oh->flags |= HWMOD_INIT_NO_IDLE;
2329 if (of_find_property(np, "ti,no-idle", NULL))
2330 oh->flags |= HWMOD_NO_IDLE;
2331}
2332
2333/**
2334 * _init - initialize internal data for the hwmod @oh
2335 * @oh: struct omap_hwmod *
2336 * @n: (unused)
2337 *
2338 * Look up the clocks and the address space used by the MPU to access
2339 * registers belonging to the hwmod @oh. @oh must already be
2340 * registered at this point. This is the first of two phases for
2341 * hwmod initialization. Code called here does not touch any hardware
2342 * registers, it simply prepares internal data structures. Returns 0
2343 * upon success or if the hwmod isn't registered or if the hwmod's
2344 * address space is not defined, or -EINVAL upon failure.
2345 */
2346static int __init _init(struct omap_hwmod *oh, void *data)
2347{
2348 int r, index;
2349 struct device_node *np = NULL;
2350 struct device_node *bus;
2351
2352 if (oh->_state != _HWMOD_STATE_REGISTERED)
2353 return 0;
2354
2355 bus = of_find_node_by_name(NULL, "ocp");
2356 if (!bus)
2357 return -ENODEV;
2358
2359 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2360 if (r)
2361 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2362 else if (np && index)
2363 pr_warn("omap_hwmod: %s using broken dt data from %pOFn\n",
2364 oh->name, np);
2365
2366 r = _init_mpu_rt_base(oh, NULL, index, np);
2367 if (r < 0) {
2368 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2369 oh->name);
2370 return 0;
2371 }
2372
2373 r = _init_clocks(oh, np);
2374 if (r < 0) {
2375 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2376 return -EINVAL;
2377 }
2378
2379 if (np) {
2380 struct device_node *child;
2381
2382 parse_module_flags(oh, np);
2383 child = of_get_next_child(np, NULL);
2384 if (child)
2385 parse_module_flags(oh, child);
2386 }
2387
2388 oh->_state = _HWMOD_STATE_INITIALIZED;
2389
2390 return 0;
2391}
2392
2393/**
2394 * _setup_iclk_autoidle - configure an IP block's interface clocks
2395 * @oh: struct omap_hwmod *
2396 *
2397 * Set up the module's interface clocks. XXX This function is still mostly
2398 * a stub; implementing this properly requires iclk autoidle usecounting in
2399 * the clock code. No return value.
2400 */
2401static void _setup_iclk_autoidle(struct omap_hwmod *oh)
2402{
2403 struct omap_hwmod_ocp_if *os;
2404
2405 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2406 return;
2407
2408 list_for_each_entry(os, &oh->slave_ports, node) {
2409 if (!os->_clk)
2410 continue;
2411
2412 if (os->flags & OCPIF_SWSUP_IDLE) {
2413 /*
2414 * we might have multiple users of one iclk with
2415 * different requirements, disable autoidle when
2416 * the module is enabled, e.g. dss iclk
2417 */
2418 } else {
2419 /* we are enabling autoidle afterwards anyways */
2420 clk_enable(os->_clk);
2421 }
2422 }
2423
2424 return;
2425}
2426
2427/**
2428 * _setup_reset - reset an IP block during the setup process
2429 * @oh: struct omap_hwmod *
2430 *
2431 * Reset the IP block corresponding to the hwmod @oh during the setup
2432 * process. The IP block is first enabled so it can be successfully
2433 * reset. Returns 0 upon success or a negative error code upon
2434 * failure.
2435 */
2436static int _setup_reset(struct omap_hwmod *oh)
2437{
2438 int r = 0;
2439
2440 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2441 return -EINVAL;
2442
2443 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2444 return -EPERM;
2445
2446 if (oh->rst_lines_cnt == 0) {
2447 r = _enable(oh);
2448 if (r) {
2449 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2450 oh->name, oh->_state);
2451 return -EINVAL;
2452 }
2453 }
2454
2455 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2456 r = _reset(oh);
2457
2458 return r;
2459}
2460
2461/**
2462 * _setup_postsetup - transition to the appropriate state after _setup
2463 * @oh: struct omap_hwmod *
2464 *
2465 * Place an IP block represented by @oh into a "post-setup" state --
2466 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2467 * this function is called at the end of _setup().) The postsetup
2468 * state for an IP block can be changed by calling
2469 * omap_hwmod_enter_postsetup_state() early in the boot process,
2470 * before one of the omap_hwmod_setup*() functions are called for the
2471 * IP block.
2472 *
2473 * The IP block stays in this state until a PM runtime-based driver is
2474 * loaded for that IP block. A post-setup state of IDLE is
2475 * appropriate for almost all IP blocks with runtime PM-enabled
2476 * drivers, since those drivers are able to enable the IP block. A
2477 * post-setup state of ENABLED is appropriate for kernels with PM
2478 * runtime disabled. The DISABLED state is appropriate for unusual IP
2479 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2480 * included, since the WDTIMER starts running on reset and will reset
2481 * the MPU if left active.
2482 *
2483 * This post-setup mechanism is deprecated. Once all of the OMAP
2484 * drivers have been converted to use PM runtime, and all of the IP
2485 * block data and interconnect data is available to the hwmod code, it
2486 * should be possible to replace this mechanism with a "lazy reset"
2487 * arrangement. In a "lazy reset" setup, each IP block is enabled
2488 * when the driver first probes, then all remaining IP blocks without
2489 * drivers are either shut down or enabled after the drivers have
2490 * loaded. However, this cannot take place until the above
2491 * preconditions have been met, since otherwise the late reset code
2492 * has no way of knowing which IP blocks are in use by drivers, and
2493 * which ones are unused.
2494 *
2495 * No return value.
2496 */
2497static void _setup_postsetup(struct omap_hwmod *oh)
2498{
2499 u8 postsetup_state;
2500
2501 if (oh->rst_lines_cnt > 0)
2502 return;
2503
2504 postsetup_state = oh->_postsetup_state;
2505 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2506 postsetup_state = _HWMOD_STATE_ENABLED;
2507
2508 /*
2509 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2510 * it should be set by the core code as a runtime flag during startup
2511 */
2512 if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
2513 (postsetup_state == _HWMOD_STATE_IDLE)) {
2514 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2515 postsetup_state = _HWMOD_STATE_ENABLED;
2516 }
2517
2518 if (postsetup_state == _HWMOD_STATE_IDLE)
2519 _idle(oh);
2520 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2521 _shutdown(oh);
2522 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2523 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2524 oh->name, postsetup_state);
2525
2526 return;
2527}
2528
2529/**
2530 * _setup - prepare IP block hardware for use
2531 * @oh: struct omap_hwmod *
2532 * @n: (unused, pass NULL)
2533 *
2534 * Configure the IP block represented by @oh. This may include
2535 * enabling the IP block, resetting it, and placing it into a
2536 * post-setup state, depending on the type of IP block and applicable
2537 * flags. IP blocks are reset to prevent any previous configuration
2538 * by the bootloader or previous operating system from interfering
2539 * with power management or other parts of the system. The reset can
2540 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2541 * two phases for hwmod initialization. Code called here generally
2542 * affects the IP block hardware, or system integration hardware
2543 * associated with the IP block. Returns 0.
2544 */
2545static int _setup(struct omap_hwmod *oh, void *data)
2546{
2547 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2548 return 0;
2549
2550 if (oh->parent_hwmod) {
2551 int r;
2552
2553 r = _enable(oh->parent_hwmod);
2554 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2555 oh->name, oh->parent_hwmod->name);
2556 }
2557
2558 _setup_iclk_autoidle(oh);
2559
2560 if (!_setup_reset(oh))
2561 _setup_postsetup(oh);
2562
2563 if (oh->parent_hwmod) {
2564 u8 postsetup_state;
2565
2566 postsetup_state = oh->parent_hwmod->_postsetup_state;
2567
2568 if (postsetup_state == _HWMOD_STATE_IDLE)
2569 _idle(oh->parent_hwmod);
2570 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2571 _shutdown(oh->parent_hwmod);
2572 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2573 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2574 oh->parent_hwmod->name, postsetup_state);
2575 }
2576
2577 return 0;
2578}
2579
2580/**
2581 * _register - register a struct omap_hwmod
2582 * @oh: struct omap_hwmod *
2583 *
2584 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2585 * already has been registered by the same name; -EINVAL if the
2586 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2587 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2588 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2589 * success.
2590 *
2591 * XXX The data should be copied into bootmem, so the original data
2592 * should be marked __initdata and freed after init. This would allow
2593 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2594 * that the copy process would be relatively complex due to the large number
2595 * of substructures.
2596 */
2597static int _register(struct omap_hwmod *oh)
2598{
2599 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2600 (oh->_state != _HWMOD_STATE_UNKNOWN))
2601 return -EINVAL;
2602
2603 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2604
2605 if (_lookup(oh->name))
2606 return -EEXIST;
2607
2608 list_add_tail(&oh->node, &omap_hwmod_list);
2609
2610 INIT_LIST_HEAD(&oh->slave_ports);
2611 spin_lock_init(&oh->_lock);
2612 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2613
2614 oh->_state = _HWMOD_STATE_REGISTERED;
2615
2616 /*
2617 * XXX Rather than doing a strcmp(), this should test a flag
2618 * set in the hwmod data, inserted by the autogenerator code.
2619 */
2620 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2621 mpu_oh = oh;
2622
2623 return 0;
2624}
2625
2626/**
2627 * _add_link - add an interconnect between two IP blocks
2628 * @oi: pointer to a struct omap_hwmod_ocp_if record
2629 *
2630 * Add struct omap_hwmod_link records connecting the slave IP block
2631 * specified in @oi->slave to @oi. This code is assumed to run before
2632 * preemption or SMP has been enabled, thus avoiding the need for
2633 * locking in this code. Changes to this assumption will require
2634 * additional locking. Returns 0.
2635 */
2636static int _add_link(struct omap_hwmod_ocp_if *oi)
2637{
2638 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2639 oi->slave->name);
2640
2641 list_add(&oi->node, &oi->slave->slave_ports);
2642 oi->slave->slaves_cnt++;
2643
2644 return 0;
2645}
2646
2647/**
2648 * _register_link - register a struct omap_hwmod_ocp_if
2649 * @oi: struct omap_hwmod_ocp_if *
2650 *
2651 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2652 * has already been registered; -EINVAL if @oi is NULL or if the
2653 * record pointed to by @oi is missing required fields; or 0 upon
2654 * success.
2655 *
2656 * XXX The data should be copied into bootmem, so the original data
2657 * should be marked __initdata and freed after init. This would allow
2658 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2659 */
2660static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2661{
2662 if (!oi || !oi->master || !oi->slave || !oi->user)
2663 return -EINVAL;
2664
2665 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2666 return -EEXIST;
2667
2668 pr_debug("omap_hwmod: registering link from %s to %s\n",
2669 oi->master->name, oi->slave->name);
2670
2671 /*
2672 * Register the connected hwmods, if they haven't been
2673 * registered already
2674 */
2675 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2676 _register(oi->master);
2677
2678 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2679 _register(oi->slave);
2680
2681 _add_link(oi);
2682
2683 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2684
2685 return 0;
2686}
2687
2688/* Static functions intended only for use in soc_ops field function pointers */
2689
2690/**
2691 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2692 * @oh: struct omap_hwmod *
2693 *
2694 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2695 * does not have an IDLEST bit or if the module successfully leaves
2696 * slave idle; otherwise, pass along the return value of the
2697 * appropriate *_cm*_wait_module_ready() function.
2698 */
2699static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2700{
2701 if (!oh)
2702 return -EINVAL;
2703
2704 if (oh->flags & HWMOD_NO_IDLEST)
2705 return 0;
2706
2707 if (!_find_mpu_rt_port(oh))
2708 return 0;
2709
2710 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2711
2712 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2713 oh->prcm.omap2.idlest_reg_id,
2714 oh->prcm.omap2.idlest_idle_bit);
2715}
2716
2717/**
2718 * _omap4_wait_target_ready - wait for a module to leave slave idle
2719 * @oh: struct omap_hwmod *
2720 *
2721 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2722 * does not have an IDLEST bit or if the module successfully leaves
2723 * slave idle; otherwise, pass along the return value of the
2724 * appropriate *_cm*_wait_module_ready() function.
2725 */
2726static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2727{
2728 if (!oh)
2729 return -EINVAL;
2730
2731 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2732 return 0;
2733
2734 if (!_find_mpu_rt_port(oh))
2735 return 0;
2736
2737 if (_omap4_clkctrl_managed_by_clkfwk(oh))
2738 return 0;
2739
2740 if (!_omap4_has_clkctrl_clock(oh))
2741 return 0;
2742
2743 /* XXX check module SIDLEMODE, hardreset status */
2744
2745 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2746 oh->clkdm->cm_inst,
2747 oh->prcm.omap4.clkctrl_offs, 0);
2748}
2749
2750/**
2751 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2752 * @oh: struct omap_hwmod * to assert hardreset
2753 * @ohri: hardreset line data
2754 *
2755 * Call omap2_prm_assert_hardreset() with parameters extracted from
2756 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2757 * use as an soc_ops function pointer. Passes along the return value
2758 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2759 * for removal when the PRM code is moved into drivers/.
2760 */
2761static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2762 struct omap_hwmod_rst_info *ohri)
2763{
2764 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2765 oh->prcm.omap2.module_offs, 0);
2766}
2767
2768/**
2769 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2770 * @oh: struct omap_hwmod * to deassert hardreset
2771 * @ohri: hardreset line data
2772 *
2773 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2774 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2775 * use as an soc_ops function pointer. Passes along the return value
2776 * from omap2_prm_deassert_hardreset(). XXX This function is
2777 * scheduled for removal when the PRM code is moved into drivers/.
2778 */
2779static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2780 struct omap_hwmod_rst_info *ohri)
2781{
2782 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2783 oh->prcm.omap2.module_offs, 0, 0);
2784}
2785
2786/**
2787 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2788 * @oh: struct omap_hwmod * to test hardreset
2789 * @ohri: hardreset line data
2790 *
2791 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2792 * from the hwmod @oh and the hardreset line data @ohri. Only
2793 * intended for use as an soc_ops function pointer. Passes along the
2794 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2795 * function is scheduled for removal when the PRM code is moved into
2796 * drivers/.
2797 */
2798static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2799 struct omap_hwmod_rst_info *ohri)
2800{
2801 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2802 oh->prcm.omap2.module_offs, 0);
2803}
2804
2805/**
2806 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2807 * @oh: struct omap_hwmod * to assert hardreset
2808 * @ohri: hardreset line data
2809 *
2810 * Call omap4_prminst_assert_hardreset() with parameters extracted
2811 * from the hwmod @oh and the hardreset line data @ohri. Only
2812 * intended for use as an soc_ops function pointer. Passes along the
2813 * return value from omap4_prminst_assert_hardreset(). XXX This
2814 * function is scheduled for removal when the PRM code is moved into
2815 * drivers/.
2816 */
2817static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2818 struct omap_hwmod_rst_info *ohri)
2819{
2820 if (!oh->clkdm)
2821 return -EINVAL;
2822
2823 return omap_prm_assert_hardreset(ohri->rst_shift,
2824 oh->clkdm->pwrdm.ptr->prcm_partition,
2825 oh->clkdm->pwrdm.ptr->prcm_offs,
2826 oh->prcm.omap4.rstctrl_offs);
2827}
2828
2829/**
2830 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2831 * @oh: struct omap_hwmod * to deassert hardreset
2832 * @ohri: hardreset line data
2833 *
2834 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2835 * from the hwmod @oh and the hardreset line data @ohri. Only
2836 * intended for use as an soc_ops function pointer. Passes along the
2837 * return value from omap4_prminst_deassert_hardreset(). XXX This
2838 * function is scheduled for removal when the PRM code is moved into
2839 * drivers/.
2840 */
2841static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2842 struct omap_hwmod_rst_info *ohri)
2843{
2844 if (!oh->clkdm)
2845 return -EINVAL;
2846
2847 if (ohri->st_shift)
2848 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2849 oh->name, ohri->name);
2850 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
2851 oh->clkdm->pwrdm.ptr->prcm_partition,
2852 oh->clkdm->pwrdm.ptr->prcm_offs,
2853 oh->prcm.omap4.rstctrl_offs,
2854 oh->prcm.omap4.rstctrl_offs +
2855 OMAP4_RST_CTRL_ST_OFFSET);
2856}
2857
2858/**
2859 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2860 * @oh: struct omap_hwmod * to test hardreset
2861 * @ohri: hardreset line data
2862 *
2863 * Call omap4_prminst_is_hardreset_asserted() with parameters
2864 * extracted from the hwmod @oh and the hardreset line data @ohri.
2865 * Only intended for use as an soc_ops function pointer. Passes along
2866 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2867 * This function is scheduled for removal when the PRM code is moved
2868 * into drivers/.
2869 */
2870static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
2871 struct omap_hwmod_rst_info *ohri)
2872{
2873 if (!oh->clkdm)
2874 return -EINVAL;
2875
2876 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
2877 oh->clkdm->pwrdm.ptr->
2878 prcm_partition,
2879 oh->clkdm->pwrdm.ptr->prcm_offs,
2880 oh->prcm.omap4.rstctrl_offs);
2881}
2882
2883/**
2884 * _omap4_disable_direct_prcm - disable direct PRCM control for hwmod
2885 * @oh: struct omap_hwmod * to disable control for
2886 *
2887 * Disables direct PRCM clkctrl done by hwmod core. Instead, the hwmod
2888 * will be using its main_clk to enable/disable the module. Returns
2889 * 0 if successful.
2890 */
2891static int _omap4_disable_direct_prcm(struct omap_hwmod *oh)
2892{
2893 if (!oh)
2894 return -EINVAL;
2895
2896 oh->prcm.omap4.flags |= HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK;
2897
2898 return 0;
2899}
2900
2901/**
2902 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2903 * @oh: struct omap_hwmod * to deassert hardreset
2904 * @ohri: hardreset line data
2905 *
2906 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2907 * from the hwmod @oh and the hardreset line data @ohri. Only
2908 * intended for use as an soc_ops function pointer. Passes along the
2909 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2910 * function is scheduled for removal when the PRM code is moved into
2911 * drivers/.
2912 */
2913static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
2914 struct omap_hwmod_rst_info *ohri)
2915{
2916 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
2917 oh->clkdm->pwrdm.ptr->prcm_partition,
2918 oh->clkdm->pwrdm.ptr->prcm_offs,
2919 oh->prcm.omap4.rstctrl_offs,
2920 oh->prcm.omap4.rstst_offs);
2921}
2922
2923/* Public functions */
2924
2925u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
2926{
2927 if (oh->flags & HWMOD_16BIT_REG)
2928 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
2929 else
2930 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
2931}
2932
2933void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
2934{
2935 if (oh->flags & HWMOD_16BIT_REG)
2936 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
2937 else
2938 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
2939}
2940
2941/**
2942 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2943 * @oh: struct omap_hwmod *
2944 *
2945 * This is a public function exposed to drivers. Some drivers may need to do
2946 * some settings before and after resetting the device. Those drivers after
2947 * doing the necessary settings could use this function to start a reset by
2948 * setting the SYSCONFIG.SOFTRESET bit.
2949 */
2950int omap_hwmod_softreset(struct omap_hwmod *oh)
2951{
2952 u32 v;
2953 int ret;
2954
2955 if (!oh || !(oh->_sysc_cache))
2956 return -EINVAL;
2957
2958 v = oh->_sysc_cache;
2959 ret = _set_softreset(oh, &v);
2960 if (ret)
2961 goto error;
2962 _write_sysconfig(v, oh);
2963
2964 ret = _clear_softreset(oh, &v);
2965 if (ret)
2966 goto error;
2967 _write_sysconfig(v, oh);
2968
2969error:
2970 return ret;
2971}
2972
2973/**
2974 * omap_hwmod_lookup - look up a registered omap_hwmod by name
2975 * @name: name of the omap_hwmod to look up
2976 *
2977 * Given a @name of an omap_hwmod, return a pointer to the registered
2978 * struct omap_hwmod *, or NULL upon error.
2979 */
2980struct omap_hwmod *omap_hwmod_lookup(const char *name)
2981{
2982 struct omap_hwmod *oh;
2983
2984 if (!name)
2985 return NULL;
2986
2987 oh = _lookup(name);
2988
2989 return oh;
2990}
2991
2992/**
2993 * omap_hwmod_for_each - call function for each registered omap_hwmod
2994 * @fn: pointer to a callback function
2995 * @data: void * data to pass to callback function
2996 *
2997 * Call @fn for each registered omap_hwmod, passing @data to each
2998 * function. @fn must return 0 for success or any other value for
2999 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3000 * will stop and the non-zero return value will be passed to the
3001 * caller of omap_hwmod_for_each(). @fn is called with
3002 * omap_hwmod_for_each() held.
3003 */
3004int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3005 void *data)
3006{
3007 struct omap_hwmod *temp_oh;
3008 int ret = 0;
3009
3010 if (!fn)
3011 return -EINVAL;
3012
3013 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3014 ret = (*fn)(temp_oh, data);
3015 if (ret)
3016 break;
3017 }
3018
3019 return ret;
3020}
3021
3022/**
3023 * omap_hwmod_register_links - register an array of hwmod links
3024 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3025 *
3026 * Intended to be called early in boot before the clock framework is
3027 * initialized. If @ois is not null, will register all omap_hwmods
3028 * listed in @ois that are valid for this chip. Returns -EINVAL if
3029 * omap_hwmod_init() hasn't been called before calling this function,
3030 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3031 * success.
3032 */
3033int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3034{
3035 int r, i;
3036
3037 if (!inited)
3038 return -EINVAL;
3039
3040 if (!ois)
3041 return 0;
3042
3043 if (ois[0] == NULL) /* Empty list */
3044 return 0;
3045
3046 i = 0;
3047 do {
3048 r = _register_link(ois[i]);
3049 WARN(r && r != -EEXIST,
3050 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3051 ois[i]->master->name, ois[i]->slave->name, r);
3052 } while (ois[++i]);
3053
3054 return 0;
3055}
3056
3057/**
3058 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3059 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3060 *
3061 * If the hwmod data corresponding to the MPU subsystem IP block
3062 * hasn't been initialized and set up yet, do so now. This must be
3063 * done first since sleep dependencies may be added from other hwmods
3064 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3065 * return value.
3066 */
3067static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3068{
3069 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3070 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3071 __func__, MPU_INITIATOR_NAME);
3072 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3073 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3074}
3075
3076/**
3077 * omap_hwmod_setup_one - set up a single hwmod
3078 * @oh_name: const char * name of the already-registered hwmod to set up
3079 *
3080 * Initialize and set up a single hwmod. Intended to be used for a
3081 * small number of early devices, such as the timer IP blocks used for
3082 * the scheduler clock. Must be called after omap2_clk_init().
3083 * Resolves the struct clk names to struct clk pointers for each
3084 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3085 * -EINVAL upon error or 0 upon success.
3086 */
3087int __init omap_hwmod_setup_one(const char *oh_name)
3088{
3089 struct omap_hwmod *oh;
3090
3091 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3092
3093 oh = _lookup(oh_name);
3094 if (!oh) {
3095 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3096 return -EINVAL;
3097 }
3098
3099 _ensure_mpu_hwmod_is_setup(oh);
3100
3101 _init(oh, NULL);
3102 _setup(oh, NULL);
3103
3104 return 0;
3105}
3106
3107static void omap_hwmod_check_one(struct device *dev,
3108 const char *name, s8 v1, u8 v2)
3109{
3110 if (v1 < 0)
3111 return;
3112
3113 if (v1 != v2)
3114 dev_warn(dev, "%s %d != %d\n", name, v1, v2);
3115}
3116
3117/**
3118 * omap_hwmod_check_sysc - check sysc against platform sysc
3119 * @dev: struct device
3120 * @data: module data
3121 * @sysc_fields: new sysc configuration
3122 */
3123static int omap_hwmod_check_sysc(struct device *dev,
3124 const struct ti_sysc_module_data *data,
3125 struct sysc_regbits *sysc_fields)
3126{
3127 const struct sysc_regbits *regbits = data->cap->regbits;
3128
3129 omap_hwmod_check_one(dev, "dmadisable_shift",
3130 regbits->dmadisable_shift,
3131 sysc_fields->dmadisable_shift);
3132 omap_hwmod_check_one(dev, "midle_shift",
3133 regbits->midle_shift,
3134 sysc_fields->midle_shift);
3135 omap_hwmod_check_one(dev, "sidle_shift",
3136 regbits->sidle_shift,
3137 sysc_fields->sidle_shift);
3138 omap_hwmod_check_one(dev, "clkact_shift",
3139 regbits->clkact_shift,
3140 sysc_fields->clkact_shift);
3141 omap_hwmod_check_one(dev, "enwkup_shift",
3142 regbits->enwkup_shift,
3143 sysc_fields->enwkup_shift);
3144 omap_hwmod_check_one(dev, "srst_shift",
3145 regbits->srst_shift,
3146 sysc_fields->srst_shift);
3147 omap_hwmod_check_one(dev, "autoidle_shift",
3148 regbits->autoidle_shift,
3149 sysc_fields->autoidle_shift);
3150
3151 return 0;
3152}
3153
3154/**
3155 * omap_hwmod_init_regbits - init sysconfig specific register bits
3156 * @dev: struct device
3157 * @oh: module
3158 * @data: module data
3159 * @sysc_fields: new sysc configuration
3160 */
3161static int omap_hwmod_init_regbits(struct device *dev, struct omap_hwmod *oh,
3162 const struct ti_sysc_module_data *data,
3163 struct sysc_regbits **sysc_fields)
3164{
3165 switch (data->cap->type) {
3166 case TI_SYSC_OMAP2:
3167 case TI_SYSC_OMAP2_TIMER:
3168 *sysc_fields = &omap_hwmod_sysc_type1;
3169 break;
3170 case TI_SYSC_OMAP3_SHAM:
3171 *sysc_fields = &omap3_sham_sysc_fields;
3172 break;
3173 case TI_SYSC_OMAP3_AES:
3174 *sysc_fields = &omap3xxx_aes_sysc_fields;
3175 break;
3176 case TI_SYSC_OMAP4:
3177 case TI_SYSC_OMAP4_TIMER:
3178 *sysc_fields = &omap_hwmod_sysc_type2;
3179 break;
3180 case TI_SYSC_OMAP4_SIMPLE:
3181 *sysc_fields = &omap_hwmod_sysc_type3;
3182 break;
3183 case TI_SYSC_OMAP34XX_SR:
3184 *sysc_fields = &omap34xx_sr_sysc_fields;
3185 break;
3186 case TI_SYSC_OMAP36XX_SR:
3187 *sysc_fields = &omap36xx_sr_sysc_fields;
3188 break;
3189 case TI_SYSC_OMAP4_SR:
3190 *sysc_fields = &omap36xx_sr_sysc_fields;
3191 break;
3192 case TI_SYSC_OMAP4_MCASP:
3193 *sysc_fields = &omap_hwmod_sysc_type_mcasp;
3194 break;
3195 case TI_SYSC_OMAP4_USB_HOST_FS:
3196 *sysc_fields = &omap_hwmod_sysc_type_usb_host_fs;
3197 break;
3198 default:
3199 *sysc_fields = NULL;
3200 if (!oh->class->sysc->sysc_fields)
3201 return 0;
3202
3203 dev_err(dev, "sysc_fields not found\n");
3204
3205 return -EINVAL;
3206 }
3207
3208 return omap_hwmod_check_sysc(dev, data, *sysc_fields);
3209}
3210
3211/**
3212 * omap_hwmod_init_reg_offs - initialize sysconfig register offsets
3213 * @dev: struct device
3214 * @data: module data
3215 * @rev_offs: revision register offset
3216 * @sysc_offs: sysc register offset
3217 * @syss_offs: syss register offset
3218 */
3219static int omap_hwmod_init_reg_offs(struct device *dev,
3220 const struct ti_sysc_module_data *data,
3221 s32 *rev_offs, s32 *sysc_offs,
3222 s32 *syss_offs)
3223{
3224 *rev_offs = -ENODEV;
3225 *sysc_offs = 0;
3226 *syss_offs = 0;
3227
3228 if (data->offsets[SYSC_REVISION] >= 0)
3229 *rev_offs = data->offsets[SYSC_REVISION];
3230
3231 if (data->offsets[SYSC_SYSCONFIG] >= 0)
3232 *sysc_offs = data->offsets[SYSC_SYSCONFIG];
3233
3234 if (data->offsets[SYSC_SYSSTATUS] >= 0)
3235 *syss_offs = data->offsets[SYSC_SYSSTATUS];
3236
3237 return 0;
3238}
3239
3240/**
3241 * omap_hwmod_init_sysc_flags - initialize sysconfig features
3242 * @dev: struct device
3243 * @data: module data
3244 * @sysc_flags: module configuration
3245 */
3246static int omap_hwmod_init_sysc_flags(struct device *dev,
3247 const struct ti_sysc_module_data *data,
3248 u32 *sysc_flags)
3249{
3250 *sysc_flags = 0;
3251
3252 switch (data->cap->type) {
3253 case TI_SYSC_OMAP2:
3254 case TI_SYSC_OMAP2_TIMER:
3255 /* See SYSC_OMAP2_* in include/dt-bindings/bus/ti-sysc.h */
3256 if (data->cfg->sysc_val & SYSC_OMAP2_CLOCKACTIVITY)
3257 *sysc_flags |= SYSC_HAS_CLOCKACTIVITY;
3258 if (data->cfg->sysc_val & SYSC_OMAP2_EMUFREE)
3259 *sysc_flags |= SYSC_HAS_EMUFREE;
3260 if (data->cfg->sysc_val & SYSC_OMAP2_ENAWAKEUP)
3261 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3262 if (data->cfg->sysc_val & SYSC_OMAP2_SOFTRESET)
3263 *sysc_flags |= SYSC_HAS_SOFTRESET;
3264 if (data->cfg->sysc_val & SYSC_OMAP2_AUTOIDLE)
3265 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3266 break;
3267 case TI_SYSC_OMAP4:
3268 case TI_SYSC_OMAP4_TIMER:
3269 /* See SYSC_OMAP4_* in include/dt-bindings/bus/ti-sysc.h */
3270 if (data->cfg->sysc_val & SYSC_OMAP4_DMADISABLE)
3271 *sysc_flags |= SYSC_HAS_DMADISABLE;
3272 if (data->cfg->sysc_val & SYSC_OMAP4_FREEEMU)
3273 *sysc_flags |= SYSC_HAS_EMUFREE;
3274 if (data->cfg->sysc_val & SYSC_OMAP4_SOFTRESET)
3275 *sysc_flags |= SYSC_HAS_SOFTRESET;
3276 break;
3277 case TI_SYSC_OMAP34XX_SR:
3278 case TI_SYSC_OMAP36XX_SR:
3279 /* See SYSC_OMAP3_SR_* in include/dt-bindings/bus/ti-sysc.h */
3280 if (data->cfg->sysc_val & SYSC_OMAP3_SR_ENAWAKEUP)
3281 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3282 break;
3283 default:
3284 if (data->cap->regbits->emufree_shift >= 0)
3285 *sysc_flags |= SYSC_HAS_EMUFREE;
3286 if (data->cap->regbits->enwkup_shift >= 0)
3287 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3288 if (data->cap->regbits->srst_shift >= 0)
3289 *sysc_flags |= SYSC_HAS_SOFTRESET;
3290 if (data->cap->regbits->autoidle_shift >= 0)
3291 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3292 break;
3293 }
3294
3295 if (data->cap->regbits->midle_shift >= 0 &&
3296 data->cfg->midlemodes)
3297 *sysc_flags |= SYSC_HAS_MIDLEMODE;
3298
3299 if (data->cap->regbits->sidle_shift >= 0 &&
3300 data->cfg->sidlemodes)
3301 *sysc_flags |= SYSC_HAS_SIDLEMODE;
3302
3303 if (data->cfg->quirks & SYSC_QUIRK_UNCACHED)
3304 *sysc_flags |= SYSC_NO_CACHE;
3305 if (data->cfg->quirks & SYSC_QUIRK_RESET_STATUS)
3306 *sysc_flags |= SYSC_HAS_RESET_STATUS;
3307
3308 if (data->cfg->syss_mask & 1)
3309 *sysc_flags |= SYSS_HAS_RESET_STATUS;
3310
3311 return 0;
3312}
3313
3314/**
3315 * omap_hwmod_init_idlemodes - initialize module idle modes
3316 * @dev: struct device
3317 * @data: module data
3318 * @idlemodes: module supported idle modes
3319 */
3320static int omap_hwmod_init_idlemodes(struct device *dev,
3321 const struct ti_sysc_module_data *data,
3322 u32 *idlemodes)
3323{
3324 *idlemodes = 0;
3325
3326 if (data->cfg->midlemodes & BIT(SYSC_IDLE_FORCE))
3327 *idlemodes |= MSTANDBY_FORCE;
3328 if (data->cfg->midlemodes & BIT(SYSC_IDLE_NO))
3329 *idlemodes |= MSTANDBY_NO;
3330 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART))
3331 *idlemodes |= MSTANDBY_SMART;
3332 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3333 *idlemodes |= MSTANDBY_SMART_WKUP;
3334
3335 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_FORCE))
3336 *idlemodes |= SIDLE_FORCE;
3337 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_NO))
3338 *idlemodes |= SIDLE_NO;
3339 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART))
3340 *idlemodes |= SIDLE_SMART;
3341 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3342 *idlemodes |= SIDLE_SMART_WKUP;
3343
3344 return 0;
3345}
3346
3347/**
3348 * omap_hwmod_check_module - check new module against platform data
3349 * @dev: struct device
3350 * @oh: module
3351 * @data: new module data
3352 * @sysc_fields: sysc register bits
3353 * @rev_offs: revision register offset
3354 * @sysc_offs: sysconfig register offset
3355 * @syss_offs: sysstatus register offset
3356 * @sysc_flags: sysc specific flags
3357 * @idlemodes: sysc supported idlemodes
3358 */
3359static int omap_hwmod_check_module(struct device *dev,
3360 struct omap_hwmod *oh,
3361 const struct ti_sysc_module_data *data,
3362 struct sysc_regbits *sysc_fields,
3363 s32 rev_offs, s32 sysc_offs,
3364 s32 syss_offs, u32 sysc_flags,
3365 u32 idlemodes)
3366{
3367 if (!oh->class->sysc)
3368 return -ENODEV;
3369
3370 if (oh->class->sysc->sysc_fields &&
3371 sysc_fields != oh->class->sysc->sysc_fields)
3372 dev_warn(dev, "sysc_fields mismatch\n");
3373
3374 if (rev_offs != oh->class->sysc->rev_offs)
3375 dev_warn(dev, "rev_offs %08x != %08x\n", rev_offs,
3376 oh->class->sysc->rev_offs);
3377 if (sysc_offs != oh->class->sysc->sysc_offs)
3378 dev_warn(dev, "sysc_offs %08x != %08x\n", sysc_offs,
3379 oh->class->sysc->sysc_offs);
3380 if (syss_offs != oh->class->sysc->syss_offs)
3381 dev_warn(dev, "syss_offs %08x != %08x\n", syss_offs,
3382 oh->class->sysc->syss_offs);
3383
3384 if (sysc_flags != oh->class->sysc->sysc_flags)
3385 dev_warn(dev, "sysc_flags %08x != %08x\n", sysc_flags,
3386 oh->class->sysc->sysc_flags);
3387
3388 if (idlemodes != oh->class->sysc->idlemodes)
3389 dev_warn(dev, "idlemodes %08x != %08x\n", idlemodes,
3390 oh->class->sysc->idlemodes);
3391
3392 if (data->cfg->srst_udelay != oh->class->sysc->srst_udelay)
3393 dev_warn(dev, "srst_udelay %i != %i\n",
3394 data->cfg->srst_udelay,
3395 oh->class->sysc->srst_udelay);
3396
3397 return 0;
3398}
3399
3400/**
3401 * omap_hwmod_allocate_module - allocate new module
3402 * @dev: struct device
3403 * @oh: module
3404 * @sysc_fields: sysc register bits
3405 * @clockdomain: clockdomain
3406 * @rev_offs: revision register offset
3407 * @sysc_offs: sysconfig register offset
3408 * @syss_offs: sysstatus register offset
3409 * @sysc_flags: sysc specific flags
3410 * @idlemodes: sysc supported idlemodes
3411 *
3412 * Note that the allocations here cannot use devm as ti-sysc can rebind.
3413 */
3414static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
3415 const struct ti_sysc_module_data *data,
3416 struct sysc_regbits *sysc_fields,
3417 struct clockdomain *clkdm,
3418 s32 rev_offs, s32 sysc_offs,
3419 s32 syss_offs, u32 sysc_flags,
3420 u32 idlemodes)
3421{
3422 struct omap_hwmod_class_sysconfig *sysc;
3423 struct omap_hwmod_class *class = NULL;
3424 struct omap_hwmod_ocp_if *oi = NULL;
3425 void __iomem *regs = NULL;
3426 unsigned long flags;
3427
3428 sysc = kzalloc(sizeof(*sysc), GFP_KERNEL);
3429 if (!sysc)
3430 return -ENOMEM;
3431
3432 sysc->sysc_fields = sysc_fields;
3433 sysc->rev_offs = rev_offs;
3434 sysc->sysc_offs = sysc_offs;
3435 sysc->syss_offs = syss_offs;
3436 sysc->sysc_flags = sysc_flags;
3437 sysc->idlemodes = idlemodes;
3438 sysc->srst_udelay = data->cfg->srst_udelay;
3439
3440 if (!oh->_mpu_rt_va) {
3441 regs = ioremap(data->module_pa,
3442 data->module_size);
3443 if (!regs)
3444 goto out_free_sysc;
3445 }
3446
3447 /*
3448 * We may need a new oh->class as the other devices in the same class
3449 * may not yet have ioremapped their registers.
3450 */
3451 if (oh->class->name && strcmp(oh->class->name, data->name)) {
3452 class = kmemdup(oh->class, sizeof(*oh->class), GFP_KERNEL);
3453 if (!class)
3454 goto out_unmap;
3455 }
3456
3457 if (list_empty(&oh->slave_ports)) {
3458 oi = kcalloc(1, sizeof(*oi), GFP_KERNEL);
3459 if (!oi)
3460 goto out_free_class;
3461
3462 /*
3463 * Note that we assume interconnect interface clocks will be
3464 * managed by the interconnect driver for OCPIF_SWSUP_IDLE case
3465 * on omap24xx and omap3.
3466 */
3467 oi->slave = oh;
3468 oi->user = OCP_USER_MPU | OCP_USER_SDMA;
3469 }
3470
3471 spin_lock_irqsave(&oh->_lock, flags);
3472 if (regs)
3473 oh->_mpu_rt_va = regs;
3474 if (class)
3475 oh->class = class;
3476 oh->class->sysc = sysc;
3477 if (oi)
3478 _add_link(oi);
3479 if (clkdm)
3480 oh->clkdm = clkdm;
3481 oh->_state = _HWMOD_STATE_INITIALIZED;
3482 oh->_postsetup_state = _HWMOD_STATE_DEFAULT;
3483 _setup(oh, NULL);
3484 spin_unlock_irqrestore(&oh->_lock, flags);
3485
3486 return 0;
3487
3488out_free_class:
3489 kfree(class);
3490out_unmap:
3491 iounmap(regs);
3492out_free_sysc:
3493 kfree(sysc);
3494 return -ENOMEM;
3495}
3496
3497static const struct omap_hwmod_reset omap24xx_reset_quirks[] = {
3498 { .match = "msdi", .len = 4, .reset = omap_msdi_reset, },
3499};
3500
3501static const struct omap_hwmod_reset omap_reset_quirks[] = {
3502 { .match = "dss_core", .len = 8, .reset = omap_dss_reset, },
3503 { .match = "hdq1w", .len = 5, .reset = omap_hdq1w_reset, },
3504 { .match = "i2c", .len = 3, .reset = omap_i2c_reset, },
3505 { .match = "wd_timer", .len = 8, .reset = omap2_wd_timer_reset, },
3506};
3507
3508static void
3509omap_hwmod_init_reset_quirk(struct device *dev, struct omap_hwmod *oh,
3510 const struct ti_sysc_module_data *data,
3511 const struct omap_hwmod_reset *quirks,
3512 int quirks_sz)
3513{
3514 const struct omap_hwmod_reset *quirk;
3515 int i;
3516
3517 for (i = 0; i < quirks_sz; i++) {
3518 quirk = &quirks[i];
3519 if (!strncmp(data->name, quirk->match, quirk->len)) {
3520 oh->class->reset = quirk->reset;
3521
3522 return;
3523 }
3524 }
3525}
3526
3527static void
3528omap_hwmod_init_reset_quirks(struct device *dev, struct omap_hwmod *oh,
3529 const struct ti_sysc_module_data *data)
3530{
3531 if (soc_is_omap24xx())
3532 omap_hwmod_init_reset_quirk(dev, oh, data,
3533 omap24xx_reset_quirks,
3534 ARRAY_SIZE(omap24xx_reset_quirks));
3535
3536 omap_hwmod_init_reset_quirk(dev, oh, data, omap_reset_quirks,
3537 ARRAY_SIZE(omap_reset_quirks));
3538}
3539
3540/**
3541 * omap_hwmod_init_module - initialize new module
3542 * @dev: struct device
3543 * @data: module data
3544 * @cookie: cookie for the caller to use for later calls
3545 */
3546int omap_hwmod_init_module(struct device *dev,
3547 const struct ti_sysc_module_data *data,
3548 struct ti_sysc_cookie *cookie)
3549{
3550 struct omap_hwmod *oh;
3551 struct sysc_regbits *sysc_fields;
3552 s32 rev_offs, sysc_offs, syss_offs;
3553 u32 sysc_flags, idlemodes;
3554 int error;
3555
3556 if (!dev || !data || !data->name || !cookie)
3557 return -EINVAL;
3558
3559 oh = _lookup(data->name);
3560 if (!oh) {
3561 oh = kzalloc(sizeof(*oh), GFP_KERNEL);
3562 if (!oh)
3563 return -ENOMEM;
3564
3565 oh->name = data->name;
3566 oh->_state = _HWMOD_STATE_UNKNOWN;
3567 lockdep_register_key(&oh->hwmod_key);
3568
3569 /* Unused, can be handled by PRM driver handling resets */
3570 oh->prcm.omap4.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT;
3571
3572 oh->class = kzalloc(sizeof(*oh->class), GFP_KERNEL);
3573 if (!oh->class) {
3574 kfree(oh);
3575 return -ENOMEM;
3576 }
3577
3578 omap_hwmod_init_reset_quirks(dev, oh, data);
3579
3580 oh->class->name = data->name;
3581 mutex_lock(&list_lock);
3582 error = _register(oh);
3583 mutex_unlock(&list_lock);
3584 }
3585
3586 cookie->data = oh;
3587
3588 error = omap_hwmod_init_regbits(dev, oh, data, &sysc_fields);
3589 if (error)
3590 return error;
3591
3592 error = omap_hwmod_init_reg_offs(dev, data, &rev_offs,
3593 &sysc_offs, &syss_offs);
3594 if (error)
3595 return error;
3596
3597 error = omap_hwmod_init_sysc_flags(dev, data, &sysc_flags);
3598 if (error)
3599 return error;
3600
3601 error = omap_hwmod_init_idlemodes(dev, data, &idlemodes);
3602 if (error)
3603 return error;
3604
3605 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE)
3606 oh->flags |= HWMOD_NO_IDLE;
3607 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE_ON_INIT)
3608 oh->flags |= HWMOD_INIT_NO_IDLE;
3609 if (data->cfg->quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
3610 oh->flags |= HWMOD_INIT_NO_RESET;
3611 if (data->cfg->quirks & SYSC_QUIRK_USE_CLOCKACT)
3612 oh->flags |= HWMOD_SET_DEFAULT_CLOCKACT;
3613 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE)
3614 oh->flags |= HWMOD_SWSUP_SIDLE;
3615 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT)
3616 oh->flags |= HWMOD_SWSUP_SIDLE_ACT;
3617 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
3618 oh->flags |= HWMOD_SWSUP_MSTANDBY;
3619 if (data->cfg->quirks & SYSC_QUIRK_CLKDM_NOAUTO)
3620 oh->flags |= HWMOD_CLKDM_NOAUTO;
3621
3622 error = omap_hwmod_check_module(dev, oh, data, sysc_fields,
3623 rev_offs, sysc_offs, syss_offs,
3624 sysc_flags, idlemodes);
3625 if (!error)
3626 return error;
3627
3628 return omap_hwmod_allocate_module(dev, oh, data, sysc_fields,
3629 cookie->clkdm, rev_offs,
3630 sysc_offs, syss_offs,
3631 sysc_flags, idlemodes);
3632}
3633
3634/**
3635 * omap_hwmod_setup_earlycon_flags - set up flags for early console
3636 *
3637 * Enable DEBUG_OMAPUART_FLAGS for uart hwmod that is being used as
3638 * early concole so that hwmod core doesn't reset and keep it in idle
3639 * that specific uart.
3640 */
3641#ifdef CONFIG_SERIAL_EARLYCON
3642static void __init omap_hwmod_setup_earlycon_flags(void)
3643{
3644 struct device_node *np;
3645 struct omap_hwmod *oh;
3646 const char *uart;
3647
3648 np = of_find_node_by_path("/chosen");
3649 if (np) {
3650 uart = of_get_property(np, "stdout-path", NULL);
3651 if (uart) {
3652 np = of_find_node_by_path(uart);
3653 if (np) {
3654 uart = of_get_property(np, "ti,hwmods", NULL);
3655 oh = omap_hwmod_lookup(uart);
3656 if (!oh) {
3657 uart = of_get_property(np->parent,
3658 "ti,hwmods",
3659 NULL);
3660 oh = omap_hwmod_lookup(uart);
3661 }
3662 if (oh)
3663 oh->flags |= DEBUG_OMAPUART_FLAGS;
3664 }
3665 }
3666 }
3667}
3668#endif
3669
3670/**
3671 * omap_hwmod_setup_all - set up all registered IP blocks
3672 *
3673 * Initialize and set up all IP blocks registered with the hwmod code.
3674 * Must be called after omap2_clk_init(). Resolves the struct clk
3675 * names to struct clk pointers for each registered omap_hwmod. Also
3676 * calls _setup() on each hwmod. Returns 0 upon success.
3677 */
3678static int __init omap_hwmod_setup_all(void)
3679{
3680 if (!inited)
3681 return 0;
3682
3683 _ensure_mpu_hwmod_is_setup(NULL);
3684
3685 omap_hwmod_for_each(_init, NULL);
3686#ifdef CONFIG_SERIAL_EARLYCON
3687 omap_hwmod_setup_earlycon_flags();
3688#endif
3689 omap_hwmod_for_each(_setup, NULL);
3690
3691 return 0;
3692}
3693omap_postcore_initcall(omap_hwmod_setup_all);
3694
3695/**
3696 * omap_hwmod_enable - enable an omap_hwmod
3697 * @oh: struct omap_hwmod *
3698 *
3699 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3700 * Returns -EINVAL on error or passes along the return value from _enable().
3701 */
3702int omap_hwmod_enable(struct omap_hwmod *oh)
3703{
3704 int r;
3705 unsigned long flags;
3706
3707 if (!oh)
3708 return -EINVAL;
3709
3710 spin_lock_irqsave(&oh->_lock, flags);
3711 r = _enable(oh);
3712 spin_unlock_irqrestore(&oh->_lock, flags);
3713
3714 return r;
3715}
3716
3717/**
3718 * omap_hwmod_idle - idle an omap_hwmod
3719 * @oh: struct omap_hwmod *
3720 *
3721 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3722 * Returns -EINVAL on error or passes along the return value from _idle().
3723 */
3724int omap_hwmod_idle(struct omap_hwmod *oh)
3725{
3726 int r;
3727 unsigned long flags;
3728
3729 if (!oh)
3730 return -EINVAL;
3731
3732 spin_lock_irqsave(&oh->_lock, flags);
3733 r = _idle(oh);
3734 spin_unlock_irqrestore(&oh->_lock, flags);
3735
3736 return r;
3737}
3738
3739/**
3740 * omap_hwmod_shutdown - shutdown an omap_hwmod
3741 * @oh: struct omap_hwmod *
3742 *
3743 * Shutdown an omap_hwmod @oh. Intended to be called by
3744 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3745 * the return value from _shutdown().
3746 */
3747int omap_hwmod_shutdown(struct omap_hwmod *oh)
3748{
3749 int r;
3750 unsigned long flags;
3751
3752 if (!oh)
3753 return -EINVAL;
3754
3755 spin_lock_irqsave(&oh->_lock, flags);
3756 r = _shutdown(oh);
3757 spin_unlock_irqrestore(&oh->_lock, flags);
3758
3759 return r;
3760}
3761
3762/*
3763 * IP block data retrieval functions
3764 */
3765
3766/**
3767 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3768 * @oh: struct omap_hwmod *
3769 *
3770 * Return the powerdomain pointer associated with the OMAP module
3771 * @oh's main clock. If @oh does not have a main clk, return the
3772 * powerdomain associated with the interface clock associated with the
3773 * module's MPU port. (XXX Perhaps this should use the SDMA port
3774 * instead?) Returns NULL on error, or a struct powerdomain * on
3775 * success.
3776 */
3777struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3778{
3779 struct clk *c;
3780 struct omap_hwmod_ocp_if *oi;
3781 struct clockdomain *clkdm;
3782 struct clk_hw_omap *clk;
3783 struct clk_hw *hw;
3784
3785 if (!oh)
3786 return NULL;
3787
3788 if (oh->clkdm)
3789 return oh->clkdm->pwrdm.ptr;
3790
3791 if (oh->_clk) {
3792 c = oh->_clk;
3793 } else {
3794 oi = _find_mpu_rt_port(oh);
3795 if (!oi)
3796 return NULL;
3797 c = oi->_clk;
3798 }
3799
3800 hw = __clk_get_hw(c);
3801 if (!hw)
3802 return NULL;
3803
3804 clk = to_clk_hw_omap(hw);
3805 if (!clk)
3806 return NULL;
3807
3808 clkdm = clk->clkdm;
3809 if (!clkdm)
3810 return NULL;
3811
3812 return clkdm->pwrdm.ptr;
3813}
3814
3815/**
3816 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3817 * @oh: struct omap_hwmod *
3818 *
3819 * Returns the virtual address corresponding to the beginning of the
3820 * module's register target, in the address range that is intended to
3821 * be used by the MPU. Returns the virtual address upon success or NULL
3822 * upon error.
3823 */
3824void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3825{
3826 if (!oh)
3827 return NULL;
3828
3829 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3830 return NULL;
3831
3832 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3833 return NULL;
3834
3835 return oh->_mpu_rt_va;
3836}
3837
3838/*
3839 * XXX what about functions for drivers to save/restore ocp_sysconfig
3840 * for context save/restore operations?
3841 */
3842
3843/**
3844 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3845 * contained in the hwmod module.
3846 * @oh: struct omap_hwmod *
3847 * @name: name of the reset line to lookup and assert
3848 *
3849 * Some IP like dsp, ipu or iva contain processor that require
3850 * an HW reset line to be assert / deassert in order to enable fully
3851 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3852 * yet supported on this OMAP; otherwise, passes along the return value
3853 * from _assert_hardreset().
3854 */
3855int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3856{
3857 int ret;
3858 unsigned long flags;
3859
3860 if (!oh)
3861 return -EINVAL;
3862
3863 spin_lock_irqsave(&oh->_lock, flags);
3864 ret = _assert_hardreset(oh, name);
3865 spin_unlock_irqrestore(&oh->_lock, flags);
3866
3867 return ret;
3868}
3869
3870/**
3871 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3872 * contained in the hwmod module.
3873 * @oh: struct omap_hwmod *
3874 * @name: name of the reset line to look up and deassert
3875 *
3876 * Some IP like dsp, ipu or iva contain processor that require
3877 * an HW reset line to be assert / deassert in order to enable fully
3878 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3879 * yet supported on this OMAP; otherwise, passes along the return value
3880 * from _deassert_hardreset().
3881 */
3882int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3883{
3884 int ret;
3885 unsigned long flags;
3886
3887 if (!oh)
3888 return -EINVAL;
3889
3890 spin_lock_irqsave(&oh->_lock, flags);
3891 ret = _deassert_hardreset(oh, name);
3892 spin_unlock_irqrestore(&oh->_lock, flags);
3893
3894 return ret;
3895}
3896
3897/**
3898 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3899 * @classname: struct omap_hwmod_class name to search for
3900 * @fn: callback function pointer to call for each hwmod in class @classname
3901 * @user: arbitrary context data to pass to the callback function
3902 *
3903 * For each omap_hwmod of class @classname, call @fn.
3904 * If the callback function returns something other than
3905 * zero, the iterator is terminated, and the callback function's return
3906 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3907 * if @classname or @fn are NULL, or passes back the error code from @fn.
3908 */
3909int omap_hwmod_for_each_by_class(const char *classname,
3910 int (*fn)(struct omap_hwmod *oh,
3911 void *user),
3912 void *user)
3913{
3914 struct omap_hwmod *temp_oh;
3915 int ret = 0;
3916
3917 if (!classname || !fn)
3918 return -EINVAL;
3919
3920 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3921 __func__, classname);
3922
3923 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3924 if (!strcmp(temp_oh->class->name, classname)) {
3925 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3926 __func__, temp_oh->name);
3927 ret = (*fn)(temp_oh, user);
3928 if (ret)
3929 break;
3930 }
3931 }
3932
3933 if (ret)
3934 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3935 __func__, ret);
3936
3937 return ret;
3938}
3939
3940/**
3941 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3942 * @oh: struct omap_hwmod *
3943 * @state: state that _setup() should leave the hwmod in
3944 *
3945 * Sets the hwmod state that @oh will enter at the end of _setup()
3946 * (called by omap_hwmod_setup_*()). See also the documentation
3947 * for _setup_postsetup(), above. Returns 0 upon success or
3948 * -EINVAL if there is a problem with the arguments or if the hwmod is
3949 * in the wrong state.
3950 */
3951int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3952{
3953 int ret;
3954 unsigned long flags;
3955
3956 if (!oh)
3957 return -EINVAL;
3958
3959 if (state != _HWMOD_STATE_DISABLED &&
3960 state != _HWMOD_STATE_ENABLED &&
3961 state != _HWMOD_STATE_IDLE)
3962 return -EINVAL;
3963
3964 spin_lock_irqsave(&oh->_lock, flags);
3965
3966 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3967 ret = -EINVAL;
3968 goto ohsps_unlock;
3969 }
3970
3971 oh->_postsetup_state = state;
3972 ret = 0;
3973
3974ohsps_unlock:
3975 spin_unlock_irqrestore(&oh->_lock, flags);
3976
3977 return ret;
3978}
3979
3980/**
3981 * omap_hwmod_get_context_loss_count - get lost context count
3982 * @oh: struct omap_hwmod *
3983 *
3984 * Returns the context loss count of associated @oh
3985 * upon success, or zero if no context loss data is available.
3986 *
3987 * On OMAP4, this queries the per-hwmod context loss register,
3988 * assuming one exists. If not, or on OMAP2/3, this queries the
3989 * enclosing powerdomain context loss count.
3990 */
3991int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3992{
3993 struct powerdomain *pwrdm;
3994 int ret = 0;
3995
3996 if (soc_ops.get_context_lost)
3997 return soc_ops.get_context_lost(oh);
3998
3999 pwrdm = omap_hwmod_get_pwrdm(oh);
4000 if (pwrdm)
4001 ret = pwrdm_get_context_loss_count(pwrdm);
4002
4003 return ret;
4004}
4005
4006/**
4007 * omap_hwmod_init - initialize the hwmod code
4008 *
4009 * Sets up some function pointers needed by the hwmod code to operate on the
4010 * currently-booted SoC. Intended to be called once during kernel init
4011 * before any hwmods are registered. No return value.
4012 */
4013void __init omap_hwmod_init(void)
4014{
4015 if (cpu_is_omap24xx()) {
4016 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4017 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4018 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4019 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4020 } else if (cpu_is_omap34xx()) {
4021 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4022 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4023 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4024 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4025 soc_ops.init_clkdm = _init_clkdm;
4026 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
4027 soc_ops.enable_module = _omap4_enable_module;
4028 soc_ops.disable_module = _omap4_disable_module;
4029 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4030 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4031 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4032 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4033 soc_ops.init_clkdm = _init_clkdm;
4034 soc_ops.update_context_lost = _omap4_update_context_lost;
4035 soc_ops.get_context_lost = _omap4_get_context_lost;
4036 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4037 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4038 } else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
4039 soc_is_am43xx()) {
4040 soc_ops.enable_module = _omap4_enable_module;
4041 soc_ops.disable_module = _omap4_disable_module;
4042 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4043 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4044 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4045 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4046 soc_ops.init_clkdm = _init_clkdm;
4047 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4048 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4049 } else {
4050 WARN(1, "omap_hwmod: unknown SoC type\n");
4051 }
4052
4053 _init_clkctrl_providers();
4054
4055 inited = true;
4056}
4057
4058/**
4059 * omap_hwmod_get_main_clk - get pointer to main clock name
4060 * @oh: struct omap_hwmod *
4061 *
4062 * Returns the main clock name assocated with @oh upon success,
4063 * or NULL if @oh is NULL.
4064 */
4065const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4066{
4067 if (!oh)
4068 return NULL;
4069
4070 return oh->main_clk;
4071}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * omap_hwmod implementation for OMAP2/3/4
4 *
5 * Copyright (C) 2009-2011 Nokia Corporation
6 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 *
8 * Paul Walmsley, Benoît Cousson, Kevin Hilman
9 *
10 * Created in collaboration with (alphabetical order): Thara Gopinath,
11 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
12 * Sawant, Santosh Shilimkar, Richard Woodruff
13 *
14 * Introduction
15 * ------------
16 * One way to view an OMAP SoC is as a collection of largely unrelated
17 * IP blocks connected by interconnects. The IP blocks include
18 * devices such as ARM processors, audio serial interfaces, UARTs,
19 * etc. Some of these devices, like the DSP, are created by TI;
20 * others, like the SGX, largely originate from external vendors. In
21 * TI's documentation, on-chip devices are referred to as "OMAP
22 * modules." Some of these IP blocks are identical across several
23 * OMAP versions. Others are revised frequently.
24 *
25 * These OMAP modules are tied together by various interconnects.
26 * Most of the address and data flow between modules is via OCP-based
27 * interconnects such as the L3 and L4 buses; but there are other
28 * interconnects that distribute the hardware clock tree, handle idle
29 * and reset signaling, supply power, and connect the modules to
30 * various pads or balls on the OMAP package.
31 *
32 * OMAP hwmod provides a consistent way to describe the on-chip
33 * hardware blocks and their integration into the rest of the chip.
34 * This description can be automatically generated from the TI
35 * hardware database. OMAP hwmod provides a standard, consistent API
36 * to reset, enable, idle, and disable these hardware blocks. And
37 * hwmod provides a way for other core code, such as the Linux device
38 * code or the OMAP power management and address space mapping code,
39 * to query the hardware database.
40 *
41 * Using hwmod
42 * -----------
43 * Drivers won't call hwmod functions directly. That is done by the
44 * omap_device code, and in rare occasions, by custom integration code
45 * in arch/arm/ *omap*. The omap_device code includes functions to
46 * build a struct platform_device using omap_hwmod data, and that is
47 * currently how hwmod data is communicated to drivers and to the
48 * Linux driver model. Most drivers will call omap_hwmod functions only
49 * indirectly, via pm_runtime*() functions.
50 *
51 * From a layering perspective, here is where the OMAP hwmod code
52 * fits into the kernel software stack:
53 *
54 * +-------------------------------+
55 * | Device driver code |
56 * | (e.g., drivers/) |
57 * +-------------------------------+
58 * | Linux driver model |
59 * | (platform_device / |
60 * | platform_driver data/code) |
61 * +-------------------------------+
62 * | OMAP core-driver integration |
63 * |(arch/arm/mach-omap2/devices.c)|
64 * +-------------------------------+
65 * | omap_device code |
66 * | (../plat-omap/omap_device.c) |
67 * +-------------------------------+
68 * ----> | omap_hwmod code/data | <-----
69 * | (../mach-omap2/omap_hwmod*) |
70 * +-------------------------------+
71 * | OMAP clock/PRCM/register fns |
72 * | ({read,write}l_relaxed, clk*) |
73 * +-------------------------------+
74 *
75 * Device drivers should not contain any OMAP-specific code or data in
76 * them. They should only contain code to operate the IP block that
77 * the driver is responsible for. This is because these IP blocks can
78 * also appear in other SoCs, either from TI (such as DaVinci) or from
79 * other manufacturers; and drivers should be reusable across other
80 * platforms.
81 *
82 * The OMAP hwmod code also will attempt to reset and idle all on-chip
83 * devices upon boot. The goal here is for the kernel to be
84 * completely self-reliant and independent from bootloaders. This is
85 * to ensure a repeatable configuration, both to ensure consistent
86 * runtime behavior, and to make it easier for others to reproduce
87 * bugs.
88 *
89 * OMAP module activity states
90 * ---------------------------
91 * The hwmod code considers modules to be in one of several activity
92 * states. IP blocks start out in an UNKNOWN state, then once they
93 * are registered via the hwmod code, proceed to the REGISTERED state.
94 * Once their clock names are resolved to clock pointers, the module
95 * enters the CLKS_INITED state; and finally, once the module has been
96 * reset and the integration registers programmed, the INITIALIZED state
97 * is entered. The hwmod code will then place the module into either
98 * the IDLE state to save power, or in the case of a critical system
99 * module, the ENABLED state.
100 *
101 * OMAP core integration code can then call omap_hwmod*() functions
102 * directly to move the module between the IDLE, ENABLED, and DISABLED
103 * states, as needed. This is done during both the PM idle loop, and
104 * in the OMAP core integration code's implementation of the PM runtime
105 * functions.
106 *
107 * References
108 * ----------
109 * This is a partial list.
110 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
111 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
112 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
113 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
114 * - Open Core Protocol Specification 2.2
115 *
116 * To do:
117 * - handle IO mapping
118 * - bus throughput & module latency measurement code
119 *
120 * XXX add tests at the beginning of each function to ensure the hwmod is
121 * in the appropriate state
122 * XXX error return values should be checked to ensure that they are
123 * appropriate
124 */
125#undef DEBUG
126
127#include <linux/kernel.h>
128#include <linux/errno.h>
129#include <linux/io.h>
130#include <linux/clk.h>
131#include <linux/clk-provider.h>
132#include <linux/delay.h>
133#include <linux/err.h>
134#include <linux/list.h>
135#include <linux/mutex.h>
136#include <linux/spinlock.h>
137#include <linux/slab.h>
138#include <linux/cpu.h>
139#include <linux/of.h>
140#include <linux/of_address.h>
141#include <linux/memblock.h>
142
143#include <linux/platform_data/ti-sysc.h>
144
145#include <dt-bindings/bus/ti-sysc.h>
146
147#include <asm/system_misc.h>
148
149#include "clock.h"
150#include "omap_hwmod.h"
151
152#include "soc.h"
153#include "common.h"
154#include "clockdomain.h"
155#include "hdq1w.h"
156#include "mmc.h"
157#include "powerdomain.h"
158#include "cm2xxx.h"
159#include "cm3xxx.h"
160#include "cm33xx.h"
161#include "prm.h"
162#include "prm3xxx.h"
163#include "prm44xx.h"
164#include "prm33xx.h"
165#include "prminst44xx.h"
166#include "pm.h"
167#include "wd_timer.h"
168
169/* Name of the OMAP hwmod for the MPU */
170#define MPU_INITIATOR_NAME "mpu"
171
172/*
173 * Number of struct omap_hwmod_link records per struct
174 * omap_hwmod_ocp_if record (master->slave and slave->master)
175 */
176#define LINKS_PER_OCP_IF 2
177
178/*
179 * Address offset (in bytes) between the reset control and the reset
180 * status registers: 4 bytes on OMAP4
181 */
182#define OMAP4_RST_CTRL_ST_OFFSET 4
183
184/*
185 * Maximum length for module clock handle names
186 */
187#define MOD_CLK_MAX_NAME_LEN 32
188
189/**
190 * struct clkctrl_provider - clkctrl provider mapping data
191 * @num_addrs: number of base address ranges for the provider
192 * @addr: base address(es) for the provider
193 * @size: size(s) of the provider address space(s)
194 * @node: device node associated with the provider
195 * @link: list link
196 */
197struct clkctrl_provider {
198 int num_addrs;
199 u32 *addr;
200 u32 *size;
201 struct device_node *node;
202 struct list_head link;
203};
204
205static LIST_HEAD(clkctrl_providers);
206
207/**
208 * struct omap_hwmod_reset - IP specific reset functions
209 * @match: string to match against the module name
210 * @len: number of characters to match
211 * @reset: IP specific reset function
212 *
213 * Used only in cases where struct omap_hwmod is dynamically allocated.
214 */
215struct omap_hwmod_reset {
216 const char *match;
217 int len;
218 int (*reset)(struct omap_hwmod *oh);
219};
220
221/**
222 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
223 * @enable_module: function to enable a module (via MODULEMODE)
224 * @disable_module: function to disable a module (via MODULEMODE)
225 *
226 * XXX Eventually this functionality will be hidden inside the PRM/CM
227 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
228 * conditionals in this code.
229 */
230struct omap_hwmod_soc_ops {
231 void (*enable_module)(struct omap_hwmod *oh);
232 int (*disable_module)(struct omap_hwmod *oh);
233 int (*wait_target_ready)(struct omap_hwmod *oh);
234 int (*assert_hardreset)(struct omap_hwmod *oh,
235 struct omap_hwmod_rst_info *ohri);
236 int (*deassert_hardreset)(struct omap_hwmod *oh,
237 struct omap_hwmod_rst_info *ohri);
238 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
239 struct omap_hwmod_rst_info *ohri);
240 int (*init_clkdm)(struct omap_hwmod *oh);
241 void (*update_context_lost)(struct omap_hwmod *oh);
242 int (*get_context_lost)(struct omap_hwmod *oh);
243 int (*disable_direct_prcm)(struct omap_hwmod *oh);
244 u32 (*xlate_clkctrl)(struct omap_hwmod *oh);
245};
246
247/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
248static struct omap_hwmod_soc_ops soc_ops;
249
250/* omap_hwmod_list contains all registered struct omap_hwmods */
251static LIST_HEAD(omap_hwmod_list);
252static DEFINE_MUTEX(list_lock);
253
254/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
255static struct omap_hwmod *mpu_oh;
256
257/* inited: set to true once the hwmod code is initialized */
258static bool inited;
259
260/* Private functions */
261
262/**
263 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
264 * @oh: struct omap_hwmod *
265 *
266 * Load the current value of the hwmod OCP_SYSCONFIG register into the
267 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
268 * OCP_SYSCONFIG register or 0 upon success.
269 */
270static int _update_sysc_cache(struct omap_hwmod *oh)
271{
272 if (!oh->class->sysc) {
273 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
274 return -EINVAL;
275 }
276
277 /* XXX ensure module interface clock is up */
278
279 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
280
281 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
282 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
283
284 return 0;
285}
286
287/**
288 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
289 * @v: OCP_SYSCONFIG value to write
290 * @oh: struct omap_hwmod *
291 *
292 * Write @v into the module class' OCP_SYSCONFIG register, if it has
293 * one. No return value.
294 */
295static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
296{
297 if (!oh->class->sysc) {
298 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
299 return;
300 }
301
302 /* XXX ensure module interface clock is up */
303
304 /* Module might have lost context, always update cache and register */
305 oh->_sysc_cache = v;
306
307 /*
308 * Some IP blocks (such as RTC) require unlocking of IP before
309 * accessing its registers. If a function pointer is present
310 * to unlock, then call it before accessing sysconfig and
311 * call lock after writing sysconfig.
312 */
313 if (oh->class->unlock)
314 oh->class->unlock(oh);
315
316 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
317
318 if (oh->class->lock)
319 oh->class->lock(oh);
320}
321
322/**
323 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
324 * @oh: struct omap_hwmod *
325 * @standbymode: MIDLEMODE field bits
326 * @v: pointer to register contents to modify
327 *
328 * Update the master standby mode bits in @v to be @standbymode for
329 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
330 * upon error or 0 upon success.
331 */
332static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
333 u32 *v)
334{
335 u32 mstandby_mask;
336 u8 mstandby_shift;
337
338 if (!oh->class->sysc ||
339 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
340 return -EINVAL;
341
342 if (!oh->class->sysc->sysc_fields) {
343 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
344 return -EINVAL;
345 }
346
347 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
348 mstandby_mask = (0x3 << mstandby_shift);
349
350 *v &= ~mstandby_mask;
351 *v |= __ffs(standbymode) << mstandby_shift;
352
353 return 0;
354}
355
356/**
357 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
358 * @oh: struct omap_hwmod *
359 * @idlemode: SIDLEMODE field bits
360 * @v: pointer to register contents to modify
361 *
362 * Update the slave idle mode bits in @v to be @idlemode for the @oh
363 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
364 * or 0 upon success.
365 */
366static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
367{
368 u32 sidle_mask;
369 u8 sidle_shift;
370
371 if (!oh->class->sysc ||
372 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
373 return -EINVAL;
374
375 if (!oh->class->sysc->sysc_fields) {
376 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
377 return -EINVAL;
378 }
379
380 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
381 sidle_mask = (0x3 << sidle_shift);
382
383 *v &= ~sidle_mask;
384 *v |= __ffs(idlemode) << sidle_shift;
385
386 return 0;
387}
388
389/**
390 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
391 * @oh: struct omap_hwmod *
392 * @clockact: CLOCKACTIVITY field bits
393 * @v: pointer to register contents to modify
394 *
395 * Update the clockactivity mode bits in @v to be @clockact for the
396 * @oh hwmod. Used for additional powersaving on some modules. Does
397 * not write to the hardware. Returns -EINVAL upon error or 0 upon
398 * success.
399 */
400static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
401{
402 u32 clkact_mask;
403 u8 clkact_shift;
404
405 if (!oh->class->sysc ||
406 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
407 return -EINVAL;
408
409 if (!oh->class->sysc->sysc_fields) {
410 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
411 return -EINVAL;
412 }
413
414 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
415 clkact_mask = (0x3 << clkact_shift);
416
417 *v &= ~clkact_mask;
418 *v |= clockact << clkact_shift;
419
420 return 0;
421}
422
423/**
424 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
425 * @oh: struct omap_hwmod *
426 * @v: pointer to register contents to modify
427 *
428 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
429 * error or 0 upon success.
430 */
431static int _set_softreset(struct omap_hwmod *oh, u32 *v)
432{
433 u32 softrst_mask;
434
435 if (!oh->class->sysc ||
436 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
437 return -EINVAL;
438
439 if (!oh->class->sysc->sysc_fields) {
440 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
441 return -EINVAL;
442 }
443
444 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
445
446 *v |= softrst_mask;
447
448 return 0;
449}
450
451/**
452 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
453 * @oh: struct omap_hwmod *
454 * @v: pointer to register contents to modify
455 *
456 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
457 * error or 0 upon success.
458 */
459static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
460{
461 u32 softrst_mask;
462
463 if (!oh->class->sysc ||
464 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
465 return -EINVAL;
466
467 if (!oh->class->sysc->sysc_fields) {
468 WARN(1,
469 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
470 oh->name);
471 return -EINVAL;
472 }
473
474 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
475
476 *v &= ~softrst_mask;
477
478 return 0;
479}
480
481/**
482 * _wait_softreset_complete - wait for an OCP softreset to complete
483 * @oh: struct omap_hwmod * to wait on
484 *
485 * Wait until the IP block represented by @oh reports that its OCP
486 * softreset is complete. This can be triggered by software (see
487 * _ocp_softreset()) or by hardware upon returning from off-mode (one
488 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
489 * microseconds. Returns the number of microseconds waited.
490 */
491static int _wait_softreset_complete(struct omap_hwmod *oh)
492{
493 struct omap_hwmod_class_sysconfig *sysc;
494 u32 softrst_mask;
495 int c = 0;
496
497 sysc = oh->class->sysc;
498
499 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS && sysc->syss_offs > 0)
500 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
501 & SYSS_RESETDONE_MASK),
502 MAX_MODULE_SOFTRESET_WAIT, c);
503 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
504 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
505 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
506 & softrst_mask),
507 MAX_MODULE_SOFTRESET_WAIT, c);
508 }
509
510 return c;
511}
512
513/**
514 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
515 * @oh: struct omap_hwmod *
516 *
517 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
518 * of some modules. When the DMA must perform read/write accesses, the
519 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
520 * for power management, software must set the DMADISABLE bit back to 1.
521 *
522 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
523 * error or 0 upon success.
524 */
525static int _set_dmadisable(struct omap_hwmod *oh)
526{
527 u32 v;
528 u32 dmadisable_mask;
529
530 if (!oh->class->sysc ||
531 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
532 return -EINVAL;
533
534 if (!oh->class->sysc->sysc_fields) {
535 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
536 return -EINVAL;
537 }
538
539 /* clocks must be on for this operation */
540 if (oh->_state != _HWMOD_STATE_ENABLED) {
541 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
542 return -EINVAL;
543 }
544
545 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
546
547 v = oh->_sysc_cache;
548 dmadisable_mask =
549 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
550 v |= dmadisable_mask;
551 _write_sysconfig(v, oh);
552
553 return 0;
554}
555
556/**
557 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
558 * @oh: struct omap_hwmod *
559 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
560 * @v: pointer to register contents to modify
561 *
562 * Update the module autoidle bit in @v to be @autoidle for the @oh
563 * hwmod. The autoidle bit controls whether the module can gate
564 * internal clocks automatically when it isn't doing anything; the
565 * exact function of this bit varies on a per-module basis. This
566 * function does not write to the hardware. Returns -EINVAL upon
567 * error or 0 upon success.
568 */
569static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
570 u32 *v)
571{
572 u32 autoidle_mask;
573 u8 autoidle_shift;
574
575 if (!oh->class->sysc ||
576 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
577 return -EINVAL;
578
579 if (!oh->class->sysc->sysc_fields) {
580 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
581 return -EINVAL;
582 }
583
584 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
585 autoidle_mask = (0x1 << autoidle_shift);
586
587 *v &= ~autoidle_mask;
588 *v |= autoidle << autoidle_shift;
589
590 return 0;
591}
592
593/**
594 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
595 * @oh: struct omap_hwmod *
596 *
597 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
598 * upon error or 0 upon success.
599 */
600static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
601{
602 if (!oh->class->sysc ||
603 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
604 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
605 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
606 return -EINVAL;
607
608 if (!oh->class->sysc->sysc_fields) {
609 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
610 return -EINVAL;
611 }
612
613 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
614 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
615
616 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
617 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
618 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
619 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
620
621 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
622
623 return 0;
624}
625
626/**
627 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
628 * @oh: struct omap_hwmod *
629 *
630 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
631 * upon error or 0 upon success.
632 */
633static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
634{
635 if (!oh->class->sysc ||
636 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
637 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
638 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
639 return -EINVAL;
640
641 if (!oh->class->sysc->sysc_fields) {
642 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
643 return -EINVAL;
644 }
645
646 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
647 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
648
649 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
650 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
651 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
652 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
653
654 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
655
656 return 0;
657}
658
659static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
660{
661 struct clk_hw_omap *clk;
662
663 if (oh->clkdm) {
664 return oh->clkdm;
665 } else if (oh->_clk) {
666 if (!omap2_clk_is_hw_omap(__clk_get_hw(oh->_clk)))
667 return NULL;
668 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
669 return clk->clkdm;
670 }
671 return NULL;
672}
673
674/**
675 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
676 * @oh: struct omap_hwmod *
677 *
678 * Prevent the hardware module @oh from entering idle while the
679 * hardare module initiator @init_oh is active. Useful when a module
680 * will be accessed by a particular initiator (e.g., if a module will
681 * be accessed by the IVA, there should be a sleepdep between the IVA
682 * initiator and the module). Only applies to modules in smart-idle
683 * mode. If the clockdomain is marked as not needing autodeps, return
684 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
685 * passes along clkdm_add_sleepdep() value upon success.
686 */
687static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
688{
689 struct clockdomain *clkdm, *init_clkdm;
690
691 clkdm = _get_clkdm(oh);
692 init_clkdm = _get_clkdm(init_oh);
693
694 if (!clkdm || !init_clkdm)
695 return -EINVAL;
696
697 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
698 return 0;
699
700 return clkdm_add_sleepdep(clkdm, init_clkdm);
701}
702
703/**
704 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
705 * @oh: struct omap_hwmod *
706 *
707 * Allow the hardware module @oh to enter idle while the hardare
708 * module initiator @init_oh is active. Useful when a module will not
709 * be accessed by a particular initiator (e.g., if a module will not
710 * be accessed by the IVA, there should be no sleepdep between the IVA
711 * initiator and the module). Only applies to modules in smart-idle
712 * mode. If the clockdomain is marked as not needing autodeps, return
713 * 0 without doing anything. Returns -EINVAL upon error or passes
714 * along clkdm_del_sleepdep() value upon success.
715 */
716static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
717{
718 struct clockdomain *clkdm, *init_clkdm;
719
720 clkdm = _get_clkdm(oh);
721 init_clkdm = _get_clkdm(init_oh);
722
723 if (!clkdm || !init_clkdm)
724 return -EINVAL;
725
726 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
727 return 0;
728
729 return clkdm_del_sleepdep(clkdm, init_clkdm);
730}
731
732static const struct of_device_id ti_clkctrl_match_table[] __initconst = {
733 { .compatible = "ti,clkctrl" },
734 { }
735};
736
737static int __init _setup_clkctrl_provider(struct device_node *np)
738{
739 const __be32 *addrp;
740 struct clkctrl_provider *provider;
741 u64 size;
742 int i;
743
744 provider = memblock_alloc(sizeof(*provider), SMP_CACHE_BYTES);
745 if (!provider)
746 return -ENOMEM;
747
748 provider->node = np;
749
750 provider->num_addrs =
751 of_property_count_elems_of_size(np, "reg", sizeof(u32)) / 2;
752
753 provider->addr =
754 memblock_alloc(sizeof(void *) * provider->num_addrs,
755 SMP_CACHE_BYTES);
756 if (!provider->addr)
757 return -ENOMEM;
758
759 provider->size =
760 memblock_alloc(sizeof(u32) * provider->num_addrs,
761 SMP_CACHE_BYTES);
762 if (!provider->size)
763 return -ENOMEM;
764
765 for (i = 0; i < provider->num_addrs; i++) {
766 addrp = of_get_address(np, i, &size, NULL);
767 provider->addr[i] = (u32)of_translate_address(np, addrp);
768 provider->size[i] = size;
769 pr_debug("%s: %pOF: %x...%x\n", __func__, np, provider->addr[i],
770 provider->addr[i] + provider->size[i]);
771 }
772
773 list_add(&provider->link, &clkctrl_providers);
774
775 return 0;
776}
777
778static int __init _init_clkctrl_providers(void)
779{
780 struct device_node *np;
781 int ret = 0;
782
783 for_each_matching_node(np, ti_clkctrl_match_table) {
784 ret = _setup_clkctrl_provider(np);
785 if (ret)
786 break;
787 }
788
789 return ret;
790}
791
792static u32 _omap4_xlate_clkctrl(struct omap_hwmod *oh)
793{
794 if (!oh->prcm.omap4.modulemode)
795 return 0;
796
797 return omap_cm_xlate_clkctrl(oh->clkdm->prcm_partition,
798 oh->clkdm->cm_inst,
799 oh->prcm.omap4.clkctrl_offs);
800}
801
802static struct clk *_lookup_clkctrl_clk(struct omap_hwmod *oh)
803{
804 struct clkctrl_provider *provider;
805 struct clk *clk;
806 u32 addr;
807
808 if (!soc_ops.xlate_clkctrl)
809 return NULL;
810
811 addr = soc_ops.xlate_clkctrl(oh);
812 if (!addr)
813 return NULL;
814
815 pr_debug("%s: %s: addr=%x\n", __func__, oh->name, addr);
816
817 list_for_each_entry(provider, &clkctrl_providers, link) {
818 int i;
819
820 for (i = 0; i < provider->num_addrs; i++) {
821 if (provider->addr[i] <= addr &&
822 provider->addr[i] + provider->size[i] > addr) {
823 struct of_phandle_args clkspec;
824
825 clkspec.np = provider->node;
826 clkspec.args_count = 2;
827 clkspec.args[0] = addr - provider->addr[0];
828 clkspec.args[1] = 0;
829
830 clk = of_clk_get_from_provider(&clkspec);
831
832 pr_debug("%s: %s got %p (offset=%x, provider=%pOF)\n",
833 __func__, oh->name, clk,
834 clkspec.args[0], provider->node);
835
836 return clk;
837 }
838 }
839 }
840
841 return NULL;
842}
843
844/**
845 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
846 * @oh: struct omap_hwmod *
847 *
848 * Called from _init_clocks(). Populates the @oh _clk (main
849 * functional clock pointer) if a clock matching the hwmod name is found,
850 * or a main_clk is present. Returns 0 on success or -EINVAL on error.
851 */
852static int _init_main_clk(struct omap_hwmod *oh)
853{
854 int ret = 0;
855 struct clk *clk = NULL;
856
857 clk = _lookup_clkctrl_clk(oh);
858
859 if (!IS_ERR_OR_NULL(clk)) {
860 pr_debug("%s: mapped main_clk %s for %s\n", __func__,
861 __clk_get_name(clk), oh->name);
862 oh->main_clk = __clk_get_name(clk);
863 oh->_clk = clk;
864 soc_ops.disable_direct_prcm(oh);
865 } else {
866 if (!oh->main_clk)
867 return 0;
868
869 oh->_clk = clk_get(NULL, oh->main_clk);
870 }
871
872 if (IS_ERR(oh->_clk)) {
873 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
874 oh->name, oh->main_clk);
875 return -EINVAL;
876 }
877 /*
878 * HACK: This needs a re-visit once clk_prepare() is implemented
879 * to do something meaningful. Today its just a no-op.
880 * If clk_prepare() is used at some point to do things like
881 * voltage scaling etc, then this would have to be moved to
882 * some point where subsystems like i2c and pmic become
883 * available.
884 */
885 clk_prepare(oh->_clk);
886
887 if (!_get_clkdm(oh))
888 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
889 oh->name, oh->main_clk);
890
891 return ret;
892}
893
894/**
895 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
896 * @oh: struct omap_hwmod *
897 *
898 * Called from _init_clocks(). Populates the @oh OCP slave interface
899 * clock pointers. Returns 0 on success or -EINVAL on error.
900 */
901static int _init_interface_clks(struct omap_hwmod *oh)
902{
903 struct omap_hwmod_ocp_if *os;
904 struct clk *c;
905 int ret = 0;
906
907 list_for_each_entry(os, &oh->slave_ports, node) {
908 if (!os->clk)
909 continue;
910
911 c = clk_get(NULL, os->clk);
912 if (IS_ERR(c)) {
913 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
914 oh->name, os->clk);
915 ret = -EINVAL;
916 continue;
917 }
918 os->_clk = c;
919 /*
920 * HACK: This needs a re-visit once clk_prepare() is implemented
921 * to do something meaningful. Today its just a no-op.
922 * If clk_prepare() is used at some point to do things like
923 * voltage scaling etc, then this would have to be moved to
924 * some point where subsystems like i2c and pmic become
925 * available.
926 */
927 clk_prepare(os->_clk);
928 }
929
930 return ret;
931}
932
933/**
934 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
935 * @oh: struct omap_hwmod *
936 *
937 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
938 * clock pointers. Returns 0 on success or -EINVAL on error.
939 */
940static int _init_opt_clks(struct omap_hwmod *oh)
941{
942 struct omap_hwmod_opt_clk *oc;
943 struct clk *c;
944 int i;
945 int ret = 0;
946
947 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
948 c = clk_get(NULL, oc->clk);
949 if (IS_ERR(c)) {
950 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
951 oh->name, oc->clk);
952 ret = -EINVAL;
953 continue;
954 }
955 oc->_clk = c;
956 /*
957 * HACK: This needs a re-visit once clk_prepare() is implemented
958 * to do something meaningful. Today its just a no-op.
959 * If clk_prepare() is used at some point to do things like
960 * voltage scaling etc, then this would have to be moved to
961 * some point where subsystems like i2c and pmic become
962 * available.
963 */
964 clk_prepare(oc->_clk);
965 }
966
967 return ret;
968}
969
970static void _enable_optional_clocks(struct omap_hwmod *oh)
971{
972 struct omap_hwmod_opt_clk *oc;
973 int i;
974
975 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
976
977 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
978 if (oc->_clk) {
979 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
980 __clk_get_name(oc->_clk));
981 clk_enable(oc->_clk);
982 }
983}
984
985static void _disable_optional_clocks(struct omap_hwmod *oh)
986{
987 struct omap_hwmod_opt_clk *oc;
988 int i;
989
990 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
991
992 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
993 if (oc->_clk) {
994 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
995 __clk_get_name(oc->_clk));
996 clk_disable(oc->_clk);
997 }
998}
999
1000/**
1001 * _enable_clocks - enable hwmod main clock and interface clocks
1002 * @oh: struct omap_hwmod *
1003 *
1004 * Enables all clocks necessary for register reads and writes to succeed
1005 * on the hwmod @oh. Returns 0.
1006 */
1007static int _enable_clocks(struct omap_hwmod *oh)
1008{
1009 struct omap_hwmod_ocp_if *os;
1010
1011 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
1012
1013 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
1014 _enable_optional_clocks(oh);
1015
1016 if (oh->_clk)
1017 clk_enable(oh->_clk);
1018
1019 list_for_each_entry(os, &oh->slave_ports, node) {
1020 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
1021 omap2_clk_deny_idle(os->_clk);
1022 clk_enable(os->_clk);
1023 }
1024 }
1025
1026 /* The opt clocks are controlled by the device driver. */
1027
1028 return 0;
1029}
1030
1031/**
1032 * _omap4_clkctrl_managed_by_clkfwk - true if clkctrl managed by clock framework
1033 * @oh: struct omap_hwmod *
1034 */
1035static bool _omap4_clkctrl_managed_by_clkfwk(struct omap_hwmod *oh)
1036{
1037 if (oh->prcm.omap4.flags & HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK)
1038 return true;
1039
1040 return false;
1041}
1042
1043/**
1044 * _omap4_has_clkctrl_clock - returns true if a module has clkctrl clock
1045 * @oh: struct omap_hwmod *
1046 */
1047static bool _omap4_has_clkctrl_clock(struct omap_hwmod *oh)
1048{
1049 if (oh->prcm.omap4.clkctrl_offs)
1050 return true;
1051
1052 if (!oh->prcm.omap4.clkctrl_offs &&
1053 oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET)
1054 return true;
1055
1056 return false;
1057}
1058
1059/**
1060 * _disable_clocks - disable hwmod main clock and interface clocks
1061 * @oh: struct omap_hwmod *
1062 *
1063 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
1064 */
1065static int _disable_clocks(struct omap_hwmod *oh)
1066{
1067 struct omap_hwmod_ocp_if *os;
1068
1069 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
1070
1071 if (oh->_clk)
1072 clk_disable(oh->_clk);
1073
1074 list_for_each_entry(os, &oh->slave_ports, node) {
1075 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
1076 clk_disable(os->_clk);
1077 omap2_clk_allow_idle(os->_clk);
1078 }
1079 }
1080
1081 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
1082 _disable_optional_clocks(oh);
1083
1084 /* The opt clocks are controlled by the device driver. */
1085
1086 return 0;
1087}
1088
1089/**
1090 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
1091 * @oh: struct omap_hwmod *
1092 *
1093 * Enables the PRCM module mode related to the hwmod @oh.
1094 * No return value.
1095 */
1096static void _omap4_enable_module(struct omap_hwmod *oh)
1097{
1098 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1099 _omap4_clkctrl_managed_by_clkfwk(oh))
1100 return;
1101
1102 pr_debug("omap_hwmod: %s: %s: %d\n",
1103 oh->name, __func__, oh->prcm.omap4.modulemode);
1104
1105 omap_cm_module_enable(oh->prcm.omap4.modulemode,
1106 oh->clkdm->prcm_partition,
1107 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
1108}
1109
1110/**
1111 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
1112 * @oh: struct omap_hwmod *
1113 *
1114 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1115 * does not have an IDLEST bit or if the module successfully enters
1116 * slave idle; otherwise, pass along the return value of the
1117 * appropriate *_cm*_wait_module_idle() function.
1118 */
1119static int _omap4_wait_target_disable(struct omap_hwmod *oh)
1120{
1121 if (!oh)
1122 return -EINVAL;
1123
1124 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1125 return 0;
1126
1127 if (oh->flags & HWMOD_NO_IDLEST)
1128 return 0;
1129
1130 if (_omap4_clkctrl_managed_by_clkfwk(oh))
1131 return 0;
1132
1133 if (!_omap4_has_clkctrl_clock(oh))
1134 return 0;
1135
1136 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1137 oh->clkdm->cm_inst,
1138 oh->prcm.omap4.clkctrl_offs, 0);
1139}
1140
1141/**
1142 * _save_mpu_port_index - find and save the index to @oh's MPU port
1143 * @oh: struct omap_hwmod *
1144 *
1145 * Determines the array index of the OCP slave port that the MPU uses
1146 * to address the device, and saves it into the struct omap_hwmod.
1147 * Intended to be called during hwmod registration only. No return
1148 * value.
1149 */
1150static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1151{
1152 struct omap_hwmod_ocp_if *os = NULL;
1153
1154 if (!oh)
1155 return;
1156
1157 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1158
1159 list_for_each_entry(os, &oh->slave_ports, node) {
1160 if (os->user & OCP_USER_MPU) {
1161 oh->_mpu_port = os;
1162 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1163 break;
1164 }
1165 }
1166
1167 return;
1168}
1169
1170/**
1171 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1172 * @oh: struct omap_hwmod *
1173 *
1174 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1175 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1176 * communicate with the IP block. This interface need not be directly
1177 * connected to the MPU (and almost certainly is not), but is directly
1178 * connected to the IP block represented by @oh. Returns a pointer
1179 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1180 * error or if there does not appear to be a path from the MPU to this
1181 * IP block.
1182 */
1183static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1184{
1185 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1186 return NULL;
1187
1188 return oh->_mpu_port;
1189};
1190
1191/**
1192 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1193 * @oh: struct omap_hwmod *
1194 *
1195 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1196 * by @oh is set to indicate to the PRCM that the IP block is active.
1197 * Usually this means placing the module into smart-idle mode and
1198 * smart-standby, but if there is a bug in the automatic idle handling
1199 * for the IP block, it may need to be placed into the force-idle or
1200 * no-idle variants of these modes. No return value.
1201 */
1202static void _enable_sysc(struct omap_hwmod *oh)
1203{
1204 u8 idlemode, sf;
1205 u32 v;
1206 bool clkdm_act;
1207 struct clockdomain *clkdm;
1208
1209 if (!oh->class->sysc)
1210 return;
1211
1212 /*
1213 * Wait until reset has completed, this is needed as the IP
1214 * block is reset automatically by hardware in some cases
1215 * (off-mode for example), and the drivers require the
1216 * IP to be ready when they access it
1217 */
1218 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1219 _enable_optional_clocks(oh);
1220 _wait_softreset_complete(oh);
1221 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1222 _disable_optional_clocks(oh);
1223
1224 v = oh->_sysc_cache;
1225 sf = oh->class->sysc->sysc_flags;
1226
1227 clkdm = _get_clkdm(oh);
1228 if (sf & SYSC_HAS_SIDLEMODE) {
1229 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1230 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1231 idlemode = HWMOD_IDLEMODE_NO;
1232 } else {
1233 if (sf & SYSC_HAS_ENAWAKEUP)
1234 _enable_wakeup(oh, &v);
1235 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1236 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1237 else
1238 idlemode = HWMOD_IDLEMODE_SMART;
1239 }
1240
1241 /*
1242 * This is special handling for some IPs like
1243 * 32k sync timer. Force them to idle!
1244 */
1245 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1246 if (clkdm_act && !(oh->class->sysc->idlemodes &
1247 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1248 idlemode = HWMOD_IDLEMODE_FORCE;
1249
1250 _set_slave_idlemode(oh, idlemode, &v);
1251 }
1252
1253 if (sf & SYSC_HAS_MIDLEMODE) {
1254 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1255 idlemode = HWMOD_IDLEMODE_FORCE;
1256 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1257 idlemode = HWMOD_IDLEMODE_NO;
1258 } else {
1259 if (sf & SYSC_HAS_ENAWAKEUP)
1260 _enable_wakeup(oh, &v);
1261 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1262 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1263 else
1264 idlemode = HWMOD_IDLEMODE_SMART;
1265 }
1266 _set_master_standbymode(oh, idlemode, &v);
1267 }
1268
1269 /*
1270 * XXX The clock framework should handle this, by
1271 * calling into this code. But this must wait until the
1272 * clock structures are tagged with omap_hwmod entries
1273 */
1274 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1275 (sf & SYSC_HAS_CLOCKACTIVITY))
1276 _set_clockactivity(oh, CLOCKACT_TEST_ICLK, &v);
1277
1278 _write_sysconfig(v, oh);
1279
1280 /*
1281 * Set the autoidle bit only after setting the smartidle bit
1282 * Setting this will not have any impact on the other modules.
1283 */
1284 if (sf & SYSC_HAS_AUTOIDLE) {
1285 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1286 0 : 1;
1287 _set_module_autoidle(oh, idlemode, &v);
1288 _write_sysconfig(v, oh);
1289 }
1290}
1291
1292/**
1293 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1294 * @oh: struct omap_hwmod *
1295 *
1296 * If module is marked as SWSUP_SIDLE, force the module into slave
1297 * idle; otherwise, configure it for smart-idle. If module is marked
1298 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1299 * configure it for smart-standby. No return value.
1300 */
1301static void _idle_sysc(struct omap_hwmod *oh)
1302{
1303 u8 idlemode, sf;
1304 u32 v;
1305
1306 if (!oh->class->sysc)
1307 return;
1308
1309 v = oh->_sysc_cache;
1310 sf = oh->class->sysc->sysc_flags;
1311
1312 if (sf & SYSC_HAS_SIDLEMODE) {
1313 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1314 idlemode = HWMOD_IDLEMODE_FORCE;
1315 } else {
1316 if (sf & SYSC_HAS_ENAWAKEUP)
1317 _enable_wakeup(oh, &v);
1318 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1319 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1320 else
1321 idlemode = HWMOD_IDLEMODE_SMART;
1322 }
1323 _set_slave_idlemode(oh, idlemode, &v);
1324 }
1325
1326 if (sf & SYSC_HAS_MIDLEMODE) {
1327 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1328 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1329 idlemode = HWMOD_IDLEMODE_FORCE;
1330 } else {
1331 if (sf & SYSC_HAS_ENAWAKEUP)
1332 _enable_wakeup(oh, &v);
1333 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1334 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1335 else
1336 idlemode = HWMOD_IDLEMODE_SMART;
1337 }
1338 _set_master_standbymode(oh, idlemode, &v);
1339 }
1340
1341 /* If the cached value is the same as the new value, skip the write */
1342 if (oh->_sysc_cache != v)
1343 _write_sysconfig(v, oh);
1344}
1345
1346/**
1347 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1348 * @oh: struct omap_hwmod *
1349 *
1350 * Force the module into slave idle and master suspend. No return
1351 * value.
1352 */
1353static void _shutdown_sysc(struct omap_hwmod *oh)
1354{
1355 u32 v;
1356 u8 sf;
1357
1358 if (!oh->class->sysc)
1359 return;
1360
1361 v = oh->_sysc_cache;
1362 sf = oh->class->sysc->sysc_flags;
1363
1364 if (sf & SYSC_HAS_SIDLEMODE)
1365 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1366
1367 if (sf & SYSC_HAS_MIDLEMODE)
1368 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1369
1370 if (sf & SYSC_HAS_AUTOIDLE)
1371 _set_module_autoidle(oh, 1, &v);
1372
1373 _write_sysconfig(v, oh);
1374}
1375
1376/**
1377 * _lookup - find an omap_hwmod by name
1378 * @name: find an omap_hwmod by name
1379 *
1380 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1381 */
1382static struct omap_hwmod *_lookup(const char *name)
1383{
1384 struct omap_hwmod *oh, *temp_oh;
1385
1386 oh = NULL;
1387
1388 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1389 if (!strcmp(name, temp_oh->name)) {
1390 oh = temp_oh;
1391 break;
1392 }
1393 }
1394
1395 return oh;
1396}
1397
1398/**
1399 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1400 * @oh: struct omap_hwmod *
1401 *
1402 * Convert a clockdomain name stored in a struct omap_hwmod into a
1403 * clockdomain pointer, and save it into the struct omap_hwmod.
1404 * Return -EINVAL if the clkdm_name lookup failed.
1405 */
1406static int _init_clkdm(struct omap_hwmod *oh)
1407{
1408 if (!oh->clkdm_name) {
1409 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1410 return 0;
1411 }
1412
1413 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1414 if (!oh->clkdm) {
1415 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1416 oh->name, oh->clkdm_name);
1417 return 0;
1418 }
1419
1420 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1421 oh->name, oh->clkdm_name);
1422
1423 return 0;
1424}
1425
1426/**
1427 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1428 * well the clockdomain.
1429 * @oh: struct omap_hwmod *
1430 * @np: device_node mapped to this hwmod
1431 *
1432 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1433 * Resolves all clock names embedded in the hwmod. Returns 0 on
1434 * success, or a negative error code on failure.
1435 */
1436static int _init_clocks(struct omap_hwmod *oh, struct device_node *np)
1437{
1438 int ret = 0;
1439
1440 if (oh->_state != _HWMOD_STATE_REGISTERED)
1441 return 0;
1442
1443 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1444
1445 if (soc_ops.init_clkdm)
1446 ret |= soc_ops.init_clkdm(oh);
1447
1448 ret |= _init_main_clk(oh);
1449 ret |= _init_interface_clks(oh);
1450 ret |= _init_opt_clks(oh);
1451
1452 if (!ret)
1453 oh->_state = _HWMOD_STATE_CLKS_INITED;
1454 else
1455 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1456
1457 return ret;
1458}
1459
1460/**
1461 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1462 * @oh: struct omap_hwmod *
1463 * @name: name of the reset line in the context of this hwmod
1464 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1465 *
1466 * Return the bit position of the reset line that match the
1467 * input name. Return -ENOENT if not found.
1468 */
1469static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1470 struct omap_hwmod_rst_info *ohri)
1471{
1472 int i;
1473
1474 for (i = 0; i < oh->rst_lines_cnt; i++) {
1475 const char *rst_line = oh->rst_lines[i].name;
1476 if (!strcmp(rst_line, name)) {
1477 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1478 ohri->st_shift = oh->rst_lines[i].st_shift;
1479 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1480 oh->name, __func__, rst_line, ohri->rst_shift,
1481 ohri->st_shift);
1482
1483 return 0;
1484 }
1485 }
1486
1487 return -ENOENT;
1488}
1489
1490/**
1491 * _assert_hardreset - assert the HW reset line of submodules
1492 * contained in the hwmod module.
1493 * @oh: struct omap_hwmod *
1494 * @name: name of the reset line to lookup and assert
1495 *
1496 * Some IP like dsp, ipu or iva contain processor that require an HW
1497 * reset line to be assert / deassert in order to enable fully the IP.
1498 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1499 * asserting the hardreset line on the currently-booted SoC, or passes
1500 * along the return value from _lookup_hardreset() or the SoC's
1501 * assert_hardreset code.
1502 */
1503static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1504{
1505 struct omap_hwmod_rst_info ohri;
1506 int ret = -EINVAL;
1507
1508 if (!oh)
1509 return -EINVAL;
1510
1511 if (!soc_ops.assert_hardreset)
1512 return -ENOSYS;
1513
1514 ret = _lookup_hardreset(oh, name, &ohri);
1515 if (ret < 0)
1516 return ret;
1517
1518 ret = soc_ops.assert_hardreset(oh, &ohri);
1519
1520 return ret;
1521}
1522
1523/**
1524 * _deassert_hardreset - deassert the HW reset line of submodules contained
1525 * in the hwmod module.
1526 * @oh: struct omap_hwmod *
1527 * @name: name of the reset line to look up and deassert
1528 *
1529 * Some IP like dsp, ipu or iva contain processor that require an HW
1530 * reset line to be assert / deassert in order to enable fully the IP.
1531 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1532 * deasserting the hardreset line on the currently-booted SoC, or passes
1533 * along the return value from _lookup_hardreset() or the SoC's
1534 * deassert_hardreset code.
1535 */
1536static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1537{
1538 struct omap_hwmod_rst_info ohri;
1539 int ret = -EINVAL;
1540
1541 if (!oh)
1542 return -EINVAL;
1543
1544 if (!soc_ops.deassert_hardreset)
1545 return -ENOSYS;
1546
1547 ret = _lookup_hardreset(oh, name, &ohri);
1548 if (ret < 0)
1549 return ret;
1550
1551 if (oh->clkdm) {
1552 /*
1553 * A clockdomain must be in SW_SUP otherwise reset
1554 * might not be completed. The clockdomain can be set
1555 * in HW_AUTO only when the module become ready.
1556 */
1557 clkdm_deny_idle(oh->clkdm);
1558 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1559 if (ret) {
1560 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1561 oh->name, oh->clkdm->name, ret);
1562 return ret;
1563 }
1564 }
1565
1566 _enable_clocks(oh);
1567 if (soc_ops.enable_module)
1568 soc_ops.enable_module(oh);
1569
1570 ret = soc_ops.deassert_hardreset(oh, &ohri);
1571
1572 if (soc_ops.disable_module)
1573 soc_ops.disable_module(oh);
1574 _disable_clocks(oh);
1575
1576 if (ret == -EBUSY)
1577 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1578
1579 if (oh->clkdm) {
1580 /*
1581 * Set the clockdomain to HW_AUTO, assuming that the
1582 * previous state was HW_AUTO.
1583 */
1584 clkdm_allow_idle(oh->clkdm);
1585
1586 clkdm_hwmod_disable(oh->clkdm, oh);
1587 }
1588
1589 return ret;
1590}
1591
1592/**
1593 * _read_hardreset - read the HW reset line state of submodules
1594 * contained in the hwmod module
1595 * @oh: struct omap_hwmod *
1596 * @name: name of the reset line to look up and read
1597 *
1598 * Return the state of the reset line. Returns -EINVAL if @oh is
1599 * null, -ENOSYS if we have no way of reading the hardreset line
1600 * status on the currently-booted SoC, or passes along the return
1601 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1602 * code.
1603 */
1604static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1605{
1606 struct omap_hwmod_rst_info ohri;
1607 int ret = -EINVAL;
1608
1609 if (!oh)
1610 return -EINVAL;
1611
1612 if (!soc_ops.is_hardreset_asserted)
1613 return -ENOSYS;
1614
1615 ret = _lookup_hardreset(oh, name, &ohri);
1616 if (ret < 0)
1617 return ret;
1618
1619 return soc_ops.is_hardreset_asserted(oh, &ohri);
1620}
1621
1622/**
1623 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1624 * @oh: struct omap_hwmod *
1625 *
1626 * If all hardreset lines associated with @oh are asserted, then return true.
1627 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1628 * associated with @oh are asserted, then return false.
1629 * This function is used to avoid executing some parts of the IP block
1630 * enable/disable sequence if its hardreset line is set.
1631 */
1632static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1633{
1634 int i, rst_cnt = 0;
1635
1636 if (oh->rst_lines_cnt == 0)
1637 return false;
1638
1639 for (i = 0; i < oh->rst_lines_cnt; i++)
1640 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1641 rst_cnt++;
1642
1643 if (oh->rst_lines_cnt == rst_cnt)
1644 return true;
1645
1646 return false;
1647}
1648
1649/**
1650 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1651 * hard-reset
1652 * @oh: struct omap_hwmod *
1653 *
1654 * If any hardreset lines associated with @oh are asserted, then
1655 * return true. Otherwise, if no hardreset lines associated with @oh
1656 * are asserted, or if @oh has no hardreset lines, then return false.
1657 * This function is used to avoid executing some parts of the IP block
1658 * enable/disable sequence if any hardreset line is set.
1659 */
1660static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1661{
1662 int rst_cnt = 0;
1663 int i;
1664
1665 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1666 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1667 rst_cnt++;
1668
1669 return (rst_cnt) ? true : false;
1670}
1671
1672/**
1673 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1674 * @oh: struct omap_hwmod *
1675 *
1676 * Disable the PRCM module mode related to the hwmod @oh.
1677 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1678 */
1679static int _omap4_disable_module(struct omap_hwmod *oh)
1680{
1681 int v;
1682
1683 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1684 _omap4_clkctrl_managed_by_clkfwk(oh))
1685 return -EINVAL;
1686
1687 /*
1688 * Since integration code might still be doing something, only
1689 * disable if all lines are under hardreset.
1690 */
1691 if (_are_any_hardreset_lines_asserted(oh))
1692 return 0;
1693
1694 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1695
1696 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1697 oh->prcm.omap4.clkctrl_offs);
1698
1699 v = _omap4_wait_target_disable(oh);
1700 if (v)
1701 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1702 oh->name);
1703
1704 return 0;
1705}
1706
1707/**
1708 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1709 * @oh: struct omap_hwmod *
1710 *
1711 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1712 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1713 * reset this way, -EINVAL if the hwmod is in the wrong state,
1714 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1715 *
1716 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1717 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1718 * use the SYSCONFIG softreset bit to provide the status.
1719 *
1720 * Note that some IP like McBSP do have reset control but don't have
1721 * reset status.
1722 */
1723static int _ocp_softreset(struct omap_hwmod *oh)
1724{
1725 u32 v;
1726 int c = 0;
1727 int ret = 0;
1728
1729 if (!oh->class->sysc ||
1730 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1731 return -ENOENT;
1732
1733 /* clocks must be on for this operation */
1734 if (oh->_state != _HWMOD_STATE_ENABLED) {
1735 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1736 oh->name);
1737 return -EINVAL;
1738 }
1739
1740 /* For some modules, all optionnal clocks need to be enabled as well */
1741 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1742 _enable_optional_clocks(oh);
1743
1744 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1745
1746 v = oh->_sysc_cache;
1747 ret = _set_softreset(oh, &v);
1748 if (ret)
1749 goto dis_opt_clks;
1750
1751 _write_sysconfig(v, oh);
1752
1753 if (oh->class->sysc->srst_udelay)
1754 udelay(oh->class->sysc->srst_udelay);
1755
1756 c = _wait_softreset_complete(oh);
1757 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1758 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1759 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1760 ret = -ETIMEDOUT;
1761 goto dis_opt_clks;
1762 } else {
1763 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1764 }
1765
1766 ret = _clear_softreset(oh, &v);
1767 if (ret)
1768 goto dis_opt_clks;
1769
1770 _write_sysconfig(v, oh);
1771
1772 /*
1773 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1774 * _wait_target_ready() or _reset()
1775 */
1776
1777dis_opt_clks:
1778 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1779 _disable_optional_clocks(oh);
1780
1781 return ret;
1782}
1783
1784/**
1785 * _reset - reset an omap_hwmod
1786 * @oh: struct omap_hwmod *
1787 *
1788 * Resets an omap_hwmod @oh. If the module has a custom reset
1789 * function pointer defined, then call it to reset the IP block, and
1790 * pass along its return value to the caller. Otherwise, if the IP
1791 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1792 * associated with it, call a function to reset the IP block via that
1793 * method, and pass along the return value to the caller. Finally, if
1794 * the IP block has some hardreset lines associated with it, assert
1795 * all of those, but do _not_ deassert them. (This is because driver
1796 * authors have expressed an apparent requirement to control the
1797 * deassertion of the hardreset lines themselves.)
1798 *
1799 * The default software reset mechanism for most OMAP IP blocks is
1800 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1801 * hwmods cannot be reset via this method. Some are not targets and
1802 * therefore have no OCP header registers to access. Others (like the
1803 * IVA) have idiosyncratic reset sequences. So for these relatively
1804 * rare cases, custom reset code can be supplied in the struct
1805 * omap_hwmod_class .reset function pointer.
1806 *
1807 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1808 * does not prevent idling of the system. This is necessary for cases
1809 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1810 * kernel without disabling dma.
1811 *
1812 * Passes along the return value from either _ocp_softreset() or the
1813 * custom reset function - these must return -EINVAL if the hwmod
1814 * cannot be reset this way or if the hwmod is in the wrong state,
1815 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1816 */
1817static int _reset(struct omap_hwmod *oh)
1818{
1819 int i, r;
1820
1821 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1822
1823 if (oh->class->reset) {
1824 r = oh->class->reset(oh);
1825 } else {
1826 if (oh->rst_lines_cnt > 0) {
1827 for (i = 0; i < oh->rst_lines_cnt; i++)
1828 _assert_hardreset(oh, oh->rst_lines[i].name);
1829 return 0;
1830 } else {
1831 r = _ocp_softreset(oh);
1832 if (r == -ENOENT)
1833 r = 0;
1834 }
1835 }
1836
1837 _set_dmadisable(oh);
1838
1839 /*
1840 * OCP_SYSCONFIG bits need to be reprogrammed after a
1841 * softreset. The _enable() function should be split to avoid
1842 * the rewrite of the OCP_SYSCONFIG register.
1843 */
1844 if (oh->class->sysc) {
1845 _update_sysc_cache(oh);
1846 _enable_sysc(oh);
1847 }
1848
1849 return r;
1850}
1851
1852/**
1853 * _omap4_update_context_lost - increment hwmod context loss counter if
1854 * hwmod context was lost, and clear hardware context loss reg
1855 * @oh: hwmod to check for context loss
1856 *
1857 * If the PRCM indicates that the hwmod @oh lost context, increment
1858 * our in-memory context loss counter, and clear the RM_*_CONTEXT
1859 * bits. No return value.
1860 */
1861static void _omap4_update_context_lost(struct omap_hwmod *oh)
1862{
1863 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
1864 return;
1865
1866 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1867 oh->clkdm->pwrdm.ptr->prcm_offs,
1868 oh->prcm.omap4.context_offs))
1869 return;
1870
1871 oh->prcm.omap4.context_lost_counter++;
1872 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1873 oh->clkdm->pwrdm.ptr->prcm_offs,
1874 oh->prcm.omap4.context_offs);
1875}
1876
1877/**
1878 * _omap4_get_context_lost - get context loss counter for a hwmod
1879 * @oh: hwmod to get context loss counter for
1880 *
1881 * Returns the in-memory context loss counter for a hwmod.
1882 */
1883static int _omap4_get_context_lost(struct omap_hwmod *oh)
1884{
1885 return oh->prcm.omap4.context_lost_counter;
1886}
1887
1888/**
1889 * _enable_preprogram - Pre-program an IP block during the _enable() process
1890 * @oh: struct omap_hwmod *
1891 *
1892 * Some IP blocks (such as AESS) require some additional programming
1893 * after enable before they can enter idle. If a function pointer to
1894 * do so is present in the hwmod data, then call it and pass along the
1895 * return value; otherwise, return 0.
1896 */
1897static int _enable_preprogram(struct omap_hwmod *oh)
1898{
1899 if (!oh->class->enable_preprogram)
1900 return 0;
1901
1902 return oh->class->enable_preprogram(oh);
1903}
1904
1905/**
1906 * _enable - enable an omap_hwmod
1907 * @oh: struct omap_hwmod *
1908 *
1909 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1910 * register target. Returns -EINVAL if the hwmod is in the wrong
1911 * state or passes along the return value of _wait_target_ready().
1912 */
1913static int _enable(struct omap_hwmod *oh)
1914{
1915 int r;
1916
1917 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1918
1919 /*
1920 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1921 * state at init.
1922 */
1923 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
1924 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
1925 return 0;
1926 }
1927
1928 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1929 oh->_state != _HWMOD_STATE_IDLE &&
1930 oh->_state != _HWMOD_STATE_DISABLED) {
1931 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
1932 oh->name);
1933 return -EINVAL;
1934 }
1935
1936 /*
1937 * If an IP block contains HW reset lines and all of them are
1938 * asserted, we let integration code associated with that
1939 * block handle the enable. We've received very little
1940 * information on what those driver authors need, and until
1941 * detailed information is provided and the driver code is
1942 * posted to the public lists, this is probably the best we
1943 * can do.
1944 */
1945 if (_are_all_hardreset_lines_asserted(oh))
1946 return 0;
1947
1948 _add_initiator_dep(oh, mpu_oh);
1949
1950 if (oh->clkdm) {
1951 /*
1952 * A clockdomain must be in SW_SUP before enabling
1953 * completely the module. The clockdomain can be set
1954 * in HW_AUTO only when the module become ready.
1955 */
1956 clkdm_deny_idle(oh->clkdm);
1957 r = clkdm_hwmod_enable(oh->clkdm, oh);
1958 if (r) {
1959 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1960 oh->name, oh->clkdm->name, r);
1961 return r;
1962 }
1963 }
1964
1965 _enable_clocks(oh);
1966 if (soc_ops.enable_module)
1967 soc_ops.enable_module(oh);
1968 if (oh->flags & HWMOD_BLOCK_WFI)
1969 cpu_idle_poll_ctrl(true);
1970
1971 if (soc_ops.update_context_lost)
1972 soc_ops.update_context_lost(oh);
1973
1974 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
1975 -EINVAL;
1976 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
1977 clkdm_allow_idle(oh->clkdm);
1978
1979 if (!r) {
1980 oh->_state = _HWMOD_STATE_ENABLED;
1981
1982 /* Access the sysconfig only if the target is ready */
1983 if (oh->class->sysc) {
1984 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1985 _update_sysc_cache(oh);
1986 _enable_sysc(oh);
1987 }
1988 r = _enable_preprogram(oh);
1989 } else {
1990 if (soc_ops.disable_module)
1991 soc_ops.disable_module(oh);
1992 _disable_clocks(oh);
1993 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
1994 oh->name, r);
1995
1996 if (oh->clkdm)
1997 clkdm_hwmod_disable(oh->clkdm, oh);
1998 }
1999
2000 return r;
2001}
2002
2003/**
2004 * _idle - idle an omap_hwmod
2005 * @oh: struct omap_hwmod *
2006 *
2007 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2008 * no further work. Returns -EINVAL if the hwmod is in the wrong
2009 * state or returns 0.
2010 */
2011static int _idle(struct omap_hwmod *oh)
2012{
2013 if (oh->flags & HWMOD_NO_IDLE) {
2014 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2015 return 0;
2016 }
2017
2018 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2019
2020 if (_are_all_hardreset_lines_asserted(oh))
2021 return 0;
2022
2023 if (oh->_state != _HWMOD_STATE_ENABLED) {
2024 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2025 oh->name);
2026 return -EINVAL;
2027 }
2028
2029 if (oh->class->sysc)
2030 _idle_sysc(oh);
2031 _del_initiator_dep(oh, mpu_oh);
2032
2033 /*
2034 * If HWMOD_CLKDM_NOAUTO is set then we don't
2035 * deny idle the clkdm again since idle was already denied
2036 * in _enable()
2037 */
2038 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
2039 clkdm_deny_idle(oh->clkdm);
2040
2041 if (oh->flags & HWMOD_BLOCK_WFI)
2042 cpu_idle_poll_ctrl(false);
2043 if (soc_ops.disable_module)
2044 soc_ops.disable_module(oh);
2045
2046 /*
2047 * The module must be in idle mode before disabling any parents
2048 * clocks. Otherwise, the parent clock might be disabled before
2049 * the module transition is done, and thus will prevent the
2050 * transition to complete properly.
2051 */
2052 _disable_clocks(oh);
2053 if (oh->clkdm) {
2054 clkdm_allow_idle(oh->clkdm);
2055 clkdm_hwmod_disable(oh->clkdm, oh);
2056 }
2057
2058 oh->_state = _HWMOD_STATE_IDLE;
2059
2060 return 0;
2061}
2062
2063/**
2064 * _shutdown - shutdown an omap_hwmod
2065 * @oh: struct omap_hwmod *
2066 *
2067 * Shut down an omap_hwmod @oh. This should be called when the driver
2068 * used for the hwmod is removed or unloaded or if the driver is not
2069 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2070 * state or returns 0.
2071 */
2072static int _shutdown(struct omap_hwmod *oh)
2073{
2074 int ret, i;
2075 u8 prev_state;
2076
2077 if (_are_all_hardreset_lines_asserted(oh))
2078 return 0;
2079
2080 if (oh->_state != _HWMOD_STATE_IDLE &&
2081 oh->_state != _HWMOD_STATE_ENABLED) {
2082 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2083 oh->name);
2084 return -EINVAL;
2085 }
2086
2087 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2088
2089 if (oh->class->pre_shutdown) {
2090 prev_state = oh->_state;
2091 if (oh->_state == _HWMOD_STATE_IDLE)
2092 _enable(oh);
2093 ret = oh->class->pre_shutdown(oh);
2094 if (ret) {
2095 if (prev_state == _HWMOD_STATE_IDLE)
2096 _idle(oh);
2097 return ret;
2098 }
2099 }
2100
2101 if (oh->class->sysc) {
2102 if (oh->_state == _HWMOD_STATE_IDLE)
2103 _enable(oh);
2104 _shutdown_sysc(oh);
2105 }
2106
2107 /* clocks and deps are already disabled in idle */
2108 if (oh->_state == _HWMOD_STATE_ENABLED) {
2109 _del_initiator_dep(oh, mpu_oh);
2110 /* XXX what about the other system initiators here? dma, dsp */
2111 if (oh->flags & HWMOD_BLOCK_WFI)
2112 cpu_idle_poll_ctrl(false);
2113 if (soc_ops.disable_module)
2114 soc_ops.disable_module(oh);
2115 _disable_clocks(oh);
2116 if (oh->clkdm)
2117 clkdm_hwmod_disable(oh->clkdm, oh);
2118 }
2119 /* XXX Should this code also force-disable the optional clocks? */
2120
2121 for (i = 0; i < oh->rst_lines_cnt; i++)
2122 _assert_hardreset(oh, oh->rst_lines[i].name);
2123
2124 oh->_state = _HWMOD_STATE_DISABLED;
2125
2126 return 0;
2127}
2128
2129static int of_dev_find_hwmod(struct device_node *np,
2130 struct omap_hwmod *oh)
2131{
2132 int count, i, res;
2133 const char *p;
2134
2135 count = of_property_count_strings(np, "ti,hwmods");
2136 if (count < 1)
2137 return -ENODEV;
2138
2139 for (i = 0; i < count; i++) {
2140 res = of_property_read_string_index(np, "ti,hwmods",
2141 i, &p);
2142 if (res)
2143 continue;
2144 if (!strcmp(p, oh->name)) {
2145 pr_debug("omap_hwmod: dt %pOFn[%i] uses hwmod %s\n",
2146 np, i, oh->name);
2147 return i;
2148 }
2149 }
2150
2151 return -ENODEV;
2152}
2153
2154/**
2155 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2156 * @np: struct device_node *
2157 * @oh: struct omap_hwmod *
2158 * @index: index of the entry found
2159 * @found: struct device_node * found or NULL
2160 *
2161 * Parse the dt blob and find out needed hwmod. Recursive function is
2162 * implemented to take care hierarchical dt blob parsing.
2163 * Return: Returns 0 on success, -ENODEV when not found.
2164 */
2165static int of_dev_hwmod_lookup(struct device_node *np,
2166 struct omap_hwmod *oh,
2167 int *index,
2168 struct device_node **found)
2169{
2170 struct device_node *np0 = NULL;
2171 int res;
2172
2173 res = of_dev_find_hwmod(np, oh);
2174 if (res >= 0) {
2175 *found = np;
2176 *index = res;
2177 return 0;
2178 }
2179
2180 for_each_child_of_node(np, np0) {
2181 struct device_node *fc;
2182 int i;
2183
2184 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2185 if (res == 0) {
2186 *found = fc;
2187 *index = i;
2188 return 0;
2189 }
2190 }
2191
2192 *found = NULL;
2193 *index = 0;
2194
2195 return -ENODEV;
2196}
2197
2198/**
2199 * omap_hwmod_fix_mpu_rt_idx - fix up mpu_rt_idx register offsets
2200 *
2201 * @oh: struct omap_hwmod *
2202 * @np: struct device_node *
2203 *
2204 * Fix up module register offsets for modules with mpu_rt_idx.
2205 * Only needed for cpsw with interconnect target module defined
2206 * in device tree while still using legacy hwmod platform data
2207 * for rev, sysc and syss registers.
2208 *
2209 * Can be removed when all cpsw hwmod platform data has been
2210 * dropped.
2211 */
2212static void omap_hwmod_fix_mpu_rt_idx(struct omap_hwmod *oh,
2213 struct device_node *np,
2214 struct resource *res)
2215{
2216 struct device_node *child = NULL;
2217 int error;
2218
2219 child = of_get_next_child(np, child);
2220 if (!child)
2221 return;
2222
2223 error = of_address_to_resource(child, oh->mpu_rt_idx, res);
2224 if (error)
2225 pr_err("%s: error mapping mpu_rt_idx: %i\n",
2226 __func__, error);
2227}
2228
2229/**
2230 * omap_hwmod_parse_module_range - map module IO range from device tree
2231 * @oh: struct omap_hwmod *
2232 * @np: struct device_node *
2233 *
2234 * Parse the device tree range an interconnect target module provides
2235 * for it's child device IP blocks. This way we can support the old
2236 * "ti,hwmods" property with just dts data without a need for platform
2237 * data for IO resources. And we don't need all the child IP device
2238 * nodes available in the dts.
2239 */
2240int omap_hwmod_parse_module_range(struct omap_hwmod *oh,
2241 struct device_node *np,
2242 struct resource *res)
2243{
2244 struct property *prop;
2245 const __be32 *ranges;
2246 const char *name;
2247 u32 nr_addr, nr_size;
2248 u64 base, size;
2249 int len, error;
2250
2251 if (!res)
2252 return -EINVAL;
2253
2254 ranges = of_get_property(np, "ranges", &len);
2255 if (!ranges)
2256 return -ENOENT;
2257
2258 len /= sizeof(*ranges);
2259
2260 if (len < 3)
2261 return -EINVAL;
2262
2263 of_property_for_each_string(np, "compatible", prop, name)
2264 if (!strncmp("ti,sysc-", name, 8))
2265 break;
2266
2267 if (!name)
2268 return -ENOENT;
2269
2270 error = of_property_read_u32(np, "#address-cells", &nr_addr);
2271 if (error)
2272 return -ENOENT;
2273
2274 error = of_property_read_u32(np, "#size-cells", &nr_size);
2275 if (error)
2276 return -ENOENT;
2277
2278 if (nr_addr != 1 || nr_size != 1) {
2279 pr_err("%s: invalid range for %s->%pOFn\n", __func__,
2280 oh->name, np);
2281 return -EINVAL;
2282 }
2283
2284 ranges++;
2285 base = of_translate_address(np, ranges++);
2286 size = be32_to_cpup(ranges);
2287
2288 pr_debug("omap_hwmod: %s %pOFn at 0x%llx size 0x%llx\n",
2289 oh->name, np, base, size);
2290
2291 if (oh && oh->mpu_rt_idx) {
2292 omap_hwmod_fix_mpu_rt_idx(oh, np, res);
2293
2294 return 0;
2295 }
2296
2297 res->start = base;
2298 res->end = base + size - 1;
2299 res->flags = IORESOURCE_MEM;
2300
2301 return 0;
2302}
2303
2304/**
2305 * _init_mpu_rt_base - populate the virtual address for a hwmod
2306 * @oh: struct omap_hwmod * to locate the virtual address
2307 * @data: (unused, caller should pass NULL)
2308 * @index: index of the reg entry iospace in device tree
2309 * @np: struct device_node * of the IP block's device node in the DT data
2310 *
2311 * Cache the virtual address used by the MPU to access this IP block's
2312 * registers. This address is needed early so the OCP registers that
2313 * are part of the device's address space can be ioremapped properly.
2314 *
2315 * If SYSC access is not needed, the registers will not be remapped
2316 * and non-availability of MPU access is not treated as an error.
2317 *
2318 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2319 * -ENXIO on absent or invalid register target address space.
2320 */
2321static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2322 int index, struct device_node *np)
2323{
2324 void __iomem *va_start = NULL;
2325 struct resource res;
2326 int error;
2327
2328 if (!oh)
2329 return -EINVAL;
2330
2331 _save_mpu_port_index(oh);
2332
2333 /* if we don't need sysc access we don't need to ioremap */
2334 if (!oh->class->sysc)
2335 return 0;
2336
2337 /* we can't continue without MPU PORT if we need sysc access */
2338 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2339 return -ENXIO;
2340
2341 if (!np) {
2342 pr_err("omap_hwmod: %s: no dt node\n", oh->name);
2343 return -ENXIO;
2344 }
2345
2346 /* Do we have a dts range for the interconnect target module? */
2347 error = omap_hwmod_parse_module_range(oh, np, &res);
2348 if (!error)
2349 va_start = ioremap(res.start, resource_size(&res));
2350
2351 /* No ranges, rely on device reg entry */
2352 if (!va_start)
2353 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2354 if (!va_start) {
2355 pr_err("omap_hwmod: %s: Missing dt reg%i for %pOF\n",
2356 oh->name, index, np);
2357 return -ENXIO;
2358 }
2359
2360 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2361 oh->name, va_start);
2362
2363 oh->_mpu_rt_va = va_start;
2364 return 0;
2365}
2366
2367static void __init parse_module_flags(struct omap_hwmod *oh,
2368 struct device_node *np)
2369{
2370 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2371 oh->flags |= HWMOD_INIT_NO_RESET;
2372 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2373 oh->flags |= HWMOD_INIT_NO_IDLE;
2374 if (of_find_property(np, "ti,no-idle", NULL))
2375 oh->flags |= HWMOD_NO_IDLE;
2376}
2377
2378/**
2379 * _init - initialize internal data for the hwmod @oh
2380 * @oh: struct omap_hwmod *
2381 * @n: (unused)
2382 *
2383 * Look up the clocks and the address space used by the MPU to access
2384 * registers belonging to the hwmod @oh. @oh must already be
2385 * registered at this point. This is the first of two phases for
2386 * hwmod initialization. Code called here does not touch any hardware
2387 * registers, it simply prepares internal data structures. Returns 0
2388 * upon success or if the hwmod isn't registered or if the hwmod's
2389 * address space is not defined, or -EINVAL upon failure.
2390 */
2391static int __init _init(struct omap_hwmod *oh, void *data)
2392{
2393 int r, index;
2394 struct device_node *np = NULL;
2395 struct device_node *bus;
2396
2397 if (oh->_state != _HWMOD_STATE_REGISTERED)
2398 return 0;
2399
2400 bus = of_find_node_by_name(NULL, "ocp");
2401 if (!bus)
2402 return -ENODEV;
2403
2404 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2405 if (r)
2406 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2407 else if (np && index)
2408 pr_warn("omap_hwmod: %s using broken dt data from %pOFn\n",
2409 oh->name, np);
2410
2411 r = _init_mpu_rt_base(oh, NULL, index, np);
2412 if (r < 0) {
2413 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2414 oh->name);
2415 return 0;
2416 }
2417
2418 r = _init_clocks(oh, np);
2419 if (r < 0) {
2420 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2421 return -EINVAL;
2422 }
2423
2424 if (np) {
2425 struct device_node *child;
2426
2427 parse_module_flags(oh, np);
2428 child = of_get_next_child(np, NULL);
2429 if (child)
2430 parse_module_flags(oh, child);
2431 }
2432
2433 oh->_state = _HWMOD_STATE_INITIALIZED;
2434
2435 return 0;
2436}
2437
2438/**
2439 * _setup_iclk_autoidle - configure an IP block's interface clocks
2440 * @oh: struct omap_hwmod *
2441 *
2442 * Set up the module's interface clocks. XXX This function is still mostly
2443 * a stub; implementing this properly requires iclk autoidle usecounting in
2444 * the clock code. No return value.
2445 */
2446static void _setup_iclk_autoidle(struct omap_hwmod *oh)
2447{
2448 struct omap_hwmod_ocp_if *os;
2449
2450 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2451 return;
2452
2453 list_for_each_entry(os, &oh->slave_ports, node) {
2454 if (!os->_clk)
2455 continue;
2456
2457 if (os->flags & OCPIF_SWSUP_IDLE) {
2458 /*
2459 * we might have multiple users of one iclk with
2460 * different requirements, disable autoidle when
2461 * the module is enabled, e.g. dss iclk
2462 */
2463 } else {
2464 /* we are enabling autoidle afterwards anyways */
2465 clk_enable(os->_clk);
2466 }
2467 }
2468
2469 return;
2470}
2471
2472/**
2473 * _setup_reset - reset an IP block during the setup process
2474 * @oh: struct omap_hwmod *
2475 *
2476 * Reset the IP block corresponding to the hwmod @oh during the setup
2477 * process. The IP block is first enabled so it can be successfully
2478 * reset. Returns 0 upon success or a negative error code upon
2479 * failure.
2480 */
2481static int _setup_reset(struct omap_hwmod *oh)
2482{
2483 int r = 0;
2484
2485 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2486 return -EINVAL;
2487
2488 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2489 return -EPERM;
2490
2491 if (oh->rst_lines_cnt == 0) {
2492 r = _enable(oh);
2493 if (r) {
2494 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2495 oh->name, oh->_state);
2496 return -EINVAL;
2497 }
2498 }
2499
2500 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2501 r = _reset(oh);
2502
2503 return r;
2504}
2505
2506/**
2507 * _setup_postsetup - transition to the appropriate state after _setup
2508 * @oh: struct omap_hwmod *
2509 *
2510 * Place an IP block represented by @oh into a "post-setup" state --
2511 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2512 * this function is called at the end of _setup().) The postsetup
2513 * state for an IP block can be changed by calling
2514 * omap_hwmod_enter_postsetup_state() early in the boot process,
2515 * before one of the omap_hwmod_setup*() functions are called for the
2516 * IP block.
2517 *
2518 * The IP block stays in this state until a PM runtime-based driver is
2519 * loaded for that IP block. A post-setup state of IDLE is
2520 * appropriate for almost all IP blocks with runtime PM-enabled
2521 * drivers, since those drivers are able to enable the IP block. A
2522 * post-setup state of ENABLED is appropriate for kernels with PM
2523 * runtime disabled. The DISABLED state is appropriate for unusual IP
2524 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2525 * included, since the WDTIMER starts running on reset and will reset
2526 * the MPU if left active.
2527 *
2528 * This post-setup mechanism is deprecated. Once all of the OMAP
2529 * drivers have been converted to use PM runtime, and all of the IP
2530 * block data and interconnect data is available to the hwmod code, it
2531 * should be possible to replace this mechanism with a "lazy reset"
2532 * arrangement. In a "lazy reset" setup, each IP block is enabled
2533 * when the driver first probes, then all remaining IP blocks without
2534 * drivers are either shut down or enabled after the drivers have
2535 * loaded. However, this cannot take place until the above
2536 * preconditions have been met, since otherwise the late reset code
2537 * has no way of knowing which IP blocks are in use by drivers, and
2538 * which ones are unused.
2539 *
2540 * No return value.
2541 */
2542static void _setup_postsetup(struct omap_hwmod *oh)
2543{
2544 u8 postsetup_state;
2545
2546 if (oh->rst_lines_cnt > 0)
2547 return;
2548
2549 postsetup_state = oh->_postsetup_state;
2550 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2551 postsetup_state = _HWMOD_STATE_ENABLED;
2552
2553 /*
2554 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2555 * it should be set by the core code as a runtime flag during startup
2556 */
2557 if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
2558 (postsetup_state == _HWMOD_STATE_IDLE)) {
2559 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2560 postsetup_state = _HWMOD_STATE_ENABLED;
2561 }
2562
2563 if (postsetup_state == _HWMOD_STATE_IDLE)
2564 _idle(oh);
2565 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2566 _shutdown(oh);
2567 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2568 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2569 oh->name, postsetup_state);
2570
2571 return;
2572}
2573
2574/**
2575 * _setup - prepare IP block hardware for use
2576 * @oh: struct omap_hwmod *
2577 * @n: (unused, pass NULL)
2578 *
2579 * Configure the IP block represented by @oh. This may include
2580 * enabling the IP block, resetting it, and placing it into a
2581 * post-setup state, depending on the type of IP block and applicable
2582 * flags. IP blocks are reset to prevent any previous configuration
2583 * by the bootloader or previous operating system from interfering
2584 * with power management or other parts of the system. The reset can
2585 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2586 * two phases for hwmod initialization. Code called here generally
2587 * affects the IP block hardware, or system integration hardware
2588 * associated with the IP block. Returns 0.
2589 */
2590static int _setup(struct omap_hwmod *oh, void *data)
2591{
2592 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2593 return 0;
2594
2595 if (oh->parent_hwmod) {
2596 int r;
2597
2598 r = _enable(oh->parent_hwmod);
2599 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2600 oh->name, oh->parent_hwmod->name);
2601 }
2602
2603 _setup_iclk_autoidle(oh);
2604
2605 if (!_setup_reset(oh))
2606 _setup_postsetup(oh);
2607
2608 if (oh->parent_hwmod) {
2609 u8 postsetup_state;
2610
2611 postsetup_state = oh->parent_hwmod->_postsetup_state;
2612
2613 if (postsetup_state == _HWMOD_STATE_IDLE)
2614 _idle(oh->parent_hwmod);
2615 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2616 _shutdown(oh->parent_hwmod);
2617 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2618 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2619 oh->parent_hwmod->name, postsetup_state);
2620 }
2621
2622 return 0;
2623}
2624
2625/**
2626 * _register - register a struct omap_hwmod
2627 * @oh: struct omap_hwmod *
2628 *
2629 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2630 * already has been registered by the same name; -EINVAL if the
2631 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2632 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2633 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2634 * success.
2635 *
2636 * XXX The data should be copied into bootmem, so the original data
2637 * should be marked __initdata and freed after init. This would allow
2638 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2639 * that the copy process would be relatively complex due to the large number
2640 * of substructures.
2641 */
2642static int _register(struct omap_hwmod *oh)
2643{
2644 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2645 (oh->_state != _HWMOD_STATE_UNKNOWN))
2646 return -EINVAL;
2647
2648 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2649
2650 if (_lookup(oh->name))
2651 return -EEXIST;
2652
2653 list_add_tail(&oh->node, &omap_hwmod_list);
2654
2655 INIT_LIST_HEAD(&oh->slave_ports);
2656 spin_lock_init(&oh->_lock);
2657 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2658
2659 oh->_state = _HWMOD_STATE_REGISTERED;
2660
2661 /*
2662 * XXX Rather than doing a strcmp(), this should test a flag
2663 * set in the hwmod data, inserted by the autogenerator code.
2664 */
2665 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2666 mpu_oh = oh;
2667
2668 return 0;
2669}
2670
2671/**
2672 * _add_link - add an interconnect between two IP blocks
2673 * @oi: pointer to a struct omap_hwmod_ocp_if record
2674 *
2675 * Add struct omap_hwmod_link records connecting the slave IP block
2676 * specified in @oi->slave to @oi. This code is assumed to run before
2677 * preemption or SMP has been enabled, thus avoiding the need for
2678 * locking in this code. Changes to this assumption will require
2679 * additional locking. Returns 0.
2680 */
2681static int _add_link(struct omap_hwmod_ocp_if *oi)
2682{
2683 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2684 oi->slave->name);
2685
2686 list_add(&oi->node, &oi->slave->slave_ports);
2687 oi->slave->slaves_cnt++;
2688
2689 return 0;
2690}
2691
2692/**
2693 * _register_link - register a struct omap_hwmod_ocp_if
2694 * @oi: struct omap_hwmod_ocp_if *
2695 *
2696 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2697 * has already been registered; -EINVAL if @oi is NULL or if the
2698 * record pointed to by @oi is missing required fields; or 0 upon
2699 * success.
2700 *
2701 * XXX The data should be copied into bootmem, so the original data
2702 * should be marked __initdata and freed after init. This would allow
2703 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2704 */
2705static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2706{
2707 if (!oi || !oi->master || !oi->slave || !oi->user)
2708 return -EINVAL;
2709
2710 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2711 return -EEXIST;
2712
2713 pr_debug("omap_hwmod: registering link from %s to %s\n",
2714 oi->master->name, oi->slave->name);
2715
2716 /*
2717 * Register the connected hwmods, if they haven't been
2718 * registered already
2719 */
2720 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2721 _register(oi->master);
2722
2723 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2724 _register(oi->slave);
2725
2726 _add_link(oi);
2727
2728 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2729
2730 return 0;
2731}
2732
2733/* Static functions intended only for use in soc_ops field function pointers */
2734
2735/**
2736 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2737 * @oh: struct omap_hwmod *
2738 *
2739 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2740 * does not have an IDLEST bit or if the module successfully leaves
2741 * slave idle; otherwise, pass along the return value of the
2742 * appropriate *_cm*_wait_module_ready() function.
2743 */
2744static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2745{
2746 if (!oh)
2747 return -EINVAL;
2748
2749 if (oh->flags & HWMOD_NO_IDLEST)
2750 return 0;
2751
2752 if (!_find_mpu_rt_port(oh))
2753 return 0;
2754
2755 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2756
2757 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2758 oh->prcm.omap2.idlest_reg_id,
2759 oh->prcm.omap2.idlest_idle_bit);
2760}
2761
2762/**
2763 * _omap4_wait_target_ready - wait for a module to leave slave idle
2764 * @oh: struct omap_hwmod *
2765 *
2766 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2767 * does not have an IDLEST bit or if the module successfully leaves
2768 * slave idle; otherwise, pass along the return value of the
2769 * appropriate *_cm*_wait_module_ready() function.
2770 */
2771static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2772{
2773 if (!oh)
2774 return -EINVAL;
2775
2776 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2777 return 0;
2778
2779 if (!_find_mpu_rt_port(oh))
2780 return 0;
2781
2782 if (_omap4_clkctrl_managed_by_clkfwk(oh))
2783 return 0;
2784
2785 if (!_omap4_has_clkctrl_clock(oh))
2786 return 0;
2787
2788 /* XXX check module SIDLEMODE, hardreset status */
2789
2790 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2791 oh->clkdm->cm_inst,
2792 oh->prcm.omap4.clkctrl_offs, 0);
2793}
2794
2795/**
2796 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2797 * @oh: struct omap_hwmod * to assert hardreset
2798 * @ohri: hardreset line data
2799 *
2800 * Call omap2_prm_assert_hardreset() with parameters extracted from
2801 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2802 * use as an soc_ops function pointer. Passes along the return value
2803 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2804 * for removal when the PRM code is moved into drivers/.
2805 */
2806static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2807 struct omap_hwmod_rst_info *ohri)
2808{
2809 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2810 oh->prcm.omap2.module_offs, 0);
2811}
2812
2813/**
2814 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2815 * @oh: struct omap_hwmod * to deassert hardreset
2816 * @ohri: hardreset line data
2817 *
2818 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2819 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2820 * use as an soc_ops function pointer. Passes along the return value
2821 * from omap2_prm_deassert_hardreset(). XXX This function is
2822 * scheduled for removal when the PRM code is moved into drivers/.
2823 */
2824static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2825 struct omap_hwmod_rst_info *ohri)
2826{
2827 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2828 oh->prcm.omap2.module_offs, 0, 0);
2829}
2830
2831/**
2832 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2833 * @oh: struct omap_hwmod * to test hardreset
2834 * @ohri: hardreset line data
2835 *
2836 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2837 * from the hwmod @oh and the hardreset line data @ohri. Only
2838 * intended for use as an soc_ops function pointer. Passes along the
2839 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2840 * function is scheduled for removal when the PRM code is moved into
2841 * drivers/.
2842 */
2843static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2844 struct omap_hwmod_rst_info *ohri)
2845{
2846 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2847 oh->prcm.omap2.module_offs, 0);
2848}
2849
2850/**
2851 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2852 * @oh: struct omap_hwmod * to assert hardreset
2853 * @ohri: hardreset line data
2854 *
2855 * Call omap4_prminst_assert_hardreset() with parameters extracted
2856 * from the hwmod @oh and the hardreset line data @ohri. Only
2857 * intended for use as an soc_ops function pointer. Passes along the
2858 * return value from omap4_prminst_assert_hardreset(). XXX This
2859 * function is scheduled for removal when the PRM code is moved into
2860 * drivers/.
2861 */
2862static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2863 struct omap_hwmod_rst_info *ohri)
2864{
2865 if (!oh->clkdm)
2866 return -EINVAL;
2867
2868 return omap_prm_assert_hardreset(ohri->rst_shift,
2869 oh->clkdm->pwrdm.ptr->prcm_partition,
2870 oh->clkdm->pwrdm.ptr->prcm_offs,
2871 oh->prcm.omap4.rstctrl_offs);
2872}
2873
2874/**
2875 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2876 * @oh: struct omap_hwmod * to deassert hardreset
2877 * @ohri: hardreset line data
2878 *
2879 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2880 * from the hwmod @oh and the hardreset line data @ohri. Only
2881 * intended for use as an soc_ops function pointer. Passes along the
2882 * return value from omap4_prminst_deassert_hardreset(). XXX This
2883 * function is scheduled for removal when the PRM code is moved into
2884 * drivers/.
2885 */
2886static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2887 struct omap_hwmod_rst_info *ohri)
2888{
2889 if (!oh->clkdm)
2890 return -EINVAL;
2891
2892 if (ohri->st_shift)
2893 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2894 oh->name, ohri->name);
2895 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
2896 oh->clkdm->pwrdm.ptr->prcm_partition,
2897 oh->clkdm->pwrdm.ptr->prcm_offs,
2898 oh->prcm.omap4.rstctrl_offs,
2899 oh->prcm.omap4.rstctrl_offs +
2900 OMAP4_RST_CTRL_ST_OFFSET);
2901}
2902
2903/**
2904 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2905 * @oh: struct omap_hwmod * to test hardreset
2906 * @ohri: hardreset line data
2907 *
2908 * Call omap4_prminst_is_hardreset_asserted() with parameters
2909 * extracted from the hwmod @oh and the hardreset line data @ohri.
2910 * Only intended for use as an soc_ops function pointer. Passes along
2911 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2912 * This function is scheduled for removal when the PRM code is moved
2913 * into drivers/.
2914 */
2915static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
2916 struct omap_hwmod_rst_info *ohri)
2917{
2918 if (!oh->clkdm)
2919 return -EINVAL;
2920
2921 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
2922 oh->clkdm->pwrdm.ptr->
2923 prcm_partition,
2924 oh->clkdm->pwrdm.ptr->prcm_offs,
2925 oh->prcm.omap4.rstctrl_offs);
2926}
2927
2928/**
2929 * _omap4_disable_direct_prcm - disable direct PRCM control for hwmod
2930 * @oh: struct omap_hwmod * to disable control for
2931 *
2932 * Disables direct PRCM clkctrl done by hwmod core. Instead, the hwmod
2933 * will be using its main_clk to enable/disable the module. Returns
2934 * 0 if successful.
2935 */
2936static int _omap4_disable_direct_prcm(struct omap_hwmod *oh)
2937{
2938 if (!oh)
2939 return -EINVAL;
2940
2941 oh->prcm.omap4.flags |= HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK;
2942
2943 return 0;
2944}
2945
2946/**
2947 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2948 * @oh: struct omap_hwmod * to deassert hardreset
2949 * @ohri: hardreset line data
2950 *
2951 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2952 * from the hwmod @oh and the hardreset line data @ohri. Only
2953 * intended for use as an soc_ops function pointer. Passes along the
2954 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2955 * function is scheduled for removal when the PRM code is moved into
2956 * drivers/.
2957 */
2958static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
2959 struct omap_hwmod_rst_info *ohri)
2960{
2961 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
2962 oh->clkdm->pwrdm.ptr->prcm_partition,
2963 oh->clkdm->pwrdm.ptr->prcm_offs,
2964 oh->prcm.omap4.rstctrl_offs,
2965 oh->prcm.omap4.rstst_offs);
2966}
2967
2968/* Public functions */
2969
2970u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
2971{
2972 if (oh->flags & HWMOD_16BIT_REG)
2973 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
2974 else
2975 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
2976}
2977
2978void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
2979{
2980 if (oh->flags & HWMOD_16BIT_REG)
2981 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
2982 else
2983 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
2984}
2985
2986/**
2987 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2988 * @oh: struct omap_hwmod *
2989 *
2990 * This is a public function exposed to drivers. Some drivers may need to do
2991 * some settings before and after resetting the device. Those drivers after
2992 * doing the necessary settings could use this function to start a reset by
2993 * setting the SYSCONFIG.SOFTRESET bit.
2994 */
2995int omap_hwmod_softreset(struct omap_hwmod *oh)
2996{
2997 u32 v;
2998 int ret;
2999
3000 if (!oh || !(oh->_sysc_cache))
3001 return -EINVAL;
3002
3003 v = oh->_sysc_cache;
3004 ret = _set_softreset(oh, &v);
3005 if (ret)
3006 goto error;
3007 _write_sysconfig(v, oh);
3008
3009 ret = _clear_softreset(oh, &v);
3010 if (ret)
3011 goto error;
3012 _write_sysconfig(v, oh);
3013
3014error:
3015 return ret;
3016}
3017
3018/**
3019 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3020 * @name: name of the omap_hwmod to look up
3021 *
3022 * Given a @name of an omap_hwmod, return a pointer to the registered
3023 * struct omap_hwmod *, or NULL upon error.
3024 */
3025struct omap_hwmod *omap_hwmod_lookup(const char *name)
3026{
3027 struct omap_hwmod *oh;
3028
3029 if (!name)
3030 return NULL;
3031
3032 oh = _lookup(name);
3033
3034 return oh;
3035}
3036
3037/**
3038 * omap_hwmod_for_each - call function for each registered omap_hwmod
3039 * @fn: pointer to a callback function
3040 * @data: void * data to pass to callback function
3041 *
3042 * Call @fn for each registered omap_hwmod, passing @data to each
3043 * function. @fn must return 0 for success or any other value for
3044 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3045 * will stop and the non-zero return value will be passed to the
3046 * caller of omap_hwmod_for_each(). @fn is called with
3047 * omap_hwmod_for_each() held.
3048 */
3049int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3050 void *data)
3051{
3052 struct omap_hwmod *temp_oh;
3053 int ret = 0;
3054
3055 if (!fn)
3056 return -EINVAL;
3057
3058 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3059 ret = (*fn)(temp_oh, data);
3060 if (ret)
3061 break;
3062 }
3063
3064 return ret;
3065}
3066
3067/**
3068 * omap_hwmod_register_links - register an array of hwmod links
3069 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3070 *
3071 * Intended to be called early in boot before the clock framework is
3072 * initialized. If @ois is not null, will register all omap_hwmods
3073 * listed in @ois that are valid for this chip. Returns -EINVAL if
3074 * omap_hwmod_init() hasn't been called before calling this function,
3075 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3076 * success.
3077 */
3078int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3079{
3080 int r, i;
3081
3082 if (!inited)
3083 return -EINVAL;
3084
3085 if (!ois)
3086 return 0;
3087
3088 if (ois[0] == NULL) /* Empty list */
3089 return 0;
3090
3091 i = 0;
3092 do {
3093 r = _register_link(ois[i]);
3094 WARN(r && r != -EEXIST,
3095 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3096 ois[i]->master->name, ois[i]->slave->name, r);
3097 } while (ois[++i]);
3098
3099 return 0;
3100}
3101
3102/**
3103 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3104 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3105 *
3106 * If the hwmod data corresponding to the MPU subsystem IP block
3107 * hasn't been initialized and set up yet, do so now. This must be
3108 * done first since sleep dependencies may be added from other hwmods
3109 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3110 * return value.
3111 */
3112static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3113{
3114 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3115 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3116 __func__, MPU_INITIATOR_NAME);
3117 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3118 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3119}
3120
3121/**
3122 * omap_hwmod_setup_one - set up a single hwmod
3123 * @oh_name: const char * name of the already-registered hwmod to set up
3124 *
3125 * Initialize and set up a single hwmod. Intended to be used for a
3126 * small number of early devices, such as the timer IP blocks used for
3127 * the scheduler clock. Must be called after omap2_clk_init().
3128 * Resolves the struct clk names to struct clk pointers for each
3129 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3130 * -EINVAL upon error or 0 upon success.
3131 */
3132int __init omap_hwmod_setup_one(const char *oh_name)
3133{
3134 struct omap_hwmod *oh;
3135
3136 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3137
3138 oh = _lookup(oh_name);
3139 if (!oh) {
3140 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3141 return -EINVAL;
3142 }
3143
3144 _ensure_mpu_hwmod_is_setup(oh);
3145
3146 _init(oh, NULL);
3147 _setup(oh, NULL);
3148
3149 return 0;
3150}
3151
3152static void omap_hwmod_check_one(struct device *dev,
3153 const char *name, s8 v1, u8 v2)
3154{
3155 if (v1 < 0)
3156 return;
3157
3158 if (v1 != v2)
3159 dev_warn(dev, "%s %d != %d\n", name, v1, v2);
3160}
3161
3162/**
3163 * omap_hwmod_check_sysc - check sysc against platform sysc
3164 * @dev: struct device
3165 * @data: module data
3166 * @sysc_fields: new sysc configuration
3167 */
3168static int omap_hwmod_check_sysc(struct device *dev,
3169 const struct ti_sysc_module_data *data,
3170 struct sysc_regbits *sysc_fields)
3171{
3172 const struct sysc_regbits *regbits = data->cap->regbits;
3173
3174 omap_hwmod_check_one(dev, "dmadisable_shift",
3175 regbits->dmadisable_shift,
3176 sysc_fields->dmadisable_shift);
3177 omap_hwmod_check_one(dev, "midle_shift",
3178 regbits->midle_shift,
3179 sysc_fields->midle_shift);
3180 omap_hwmod_check_one(dev, "sidle_shift",
3181 regbits->sidle_shift,
3182 sysc_fields->sidle_shift);
3183 omap_hwmod_check_one(dev, "clkact_shift",
3184 regbits->clkact_shift,
3185 sysc_fields->clkact_shift);
3186 omap_hwmod_check_one(dev, "enwkup_shift",
3187 regbits->enwkup_shift,
3188 sysc_fields->enwkup_shift);
3189 omap_hwmod_check_one(dev, "srst_shift",
3190 regbits->srst_shift,
3191 sysc_fields->srst_shift);
3192 omap_hwmod_check_one(dev, "autoidle_shift",
3193 regbits->autoidle_shift,
3194 sysc_fields->autoidle_shift);
3195
3196 return 0;
3197}
3198
3199/**
3200 * omap_hwmod_init_regbits - init sysconfig specific register bits
3201 * @dev: struct device
3202 * @data: module data
3203 * @sysc_fields: new sysc configuration
3204 */
3205static int omap_hwmod_init_regbits(struct device *dev,
3206 const struct ti_sysc_module_data *data,
3207 struct sysc_regbits **sysc_fields)
3208{
3209 *sysc_fields = NULL;
3210
3211 switch (data->cap->type) {
3212 case TI_SYSC_OMAP2:
3213 case TI_SYSC_OMAP2_TIMER:
3214 *sysc_fields = &omap_hwmod_sysc_type1;
3215 break;
3216 case TI_SYSC_OMAP3_SHAM:
3217 *sysc_fields = &omap3_sham_sysc_fields;
3218 break;
3219 case TI_SYSC_OMAP3_AES:
3220 *sysc_fields = &omap3xxx_aes_sysc_fields;
3221 break;
3222 case TI_SYSC_OMAP4:
3223 case TI_SYSC_OMAP4_TIMER:
3224 *sysc_fields = &omap_hwmod_sysc_type2;
3225 break;
3226 case TI_SYSC_OMAP4_SIMPLE:
3227 *sysc_fields = &omap_hwmod_sysc_type3;
3228 break;
3229 case TI_SYSC_OMAP34XX_SR:
3230 *sysc_fields = &omap34xx_sr_sysc_fields;
3231 break;
3232 case TI_SYSC_OMAP36XX_SR:
3233 *sysc_fields = &omap36xx_sr_sysc_fields;
3234 break;
3235 case TI_SYSC_OMAP4_SR:
3236 *sysc_fields = &omap36xx_sr_sysc_fields;
3237 break;
3238 case TI_SYSC_OMAP4_MCASP:
3239 *sysc_fields = &omap_hwmod_sysc_type_mcasp;
3240 break;
3241 case TI_SYSC_OMAP4_USB_HOST_FS:
3242 *sysc_fields = &omap_hwmod_sysc_type_usb_host_fs;
3243 break;
3244 default:
3245 return -EINVAL;
3246 }
3247
3248 return omap_hwmod_check_sysc(dev, data, *sysc_fields);
3249}
3250
3251/**
3252 * omap_hwmod_init_reg_offs - initialize sysconfig register offsets
3253 * @dev: struct device
3254 * @data: module data
3255 * @rev_offs: revision register offset
3256 * @sysc_offs: sysc register offset
3257 * @syss_offs: syss register offset
3258 */
3259static int omap_hwmod_init_reg_offs(struct device *dev,
3260 const struct ti_sysc_module_data *data,
3261 s32 *rev_offs, s32 *sysc_offs,
3262 s32 *syss_offs)
3263{
3264 *rev_offs = -ENODEV;
3265 *sysc_offs = 0;
3266 *syss_offs = 0;
3267
3268 if (data->offsets[SYSC_REVISION] >= 0)
3269 *rev_offs = data->offsets[SYSC_REVISION];
3270
3271 if (data->offsets[SYSC_SYSCONFIG] >= 0)
3272 *sysc_offs = data->offsets[SYSC_SYSCONFIG];
3273
3274 if (data->offsets[SYSC_SYSSTATUS] >= 0)
3275 *syss_offs = data->offsets[SYSC_SYSSTATUS];
3276
3277 return 0;
3278}
3279
3280/**
3281 * omap_hwmod_init_sysc_flags - initialize sysconfig features
3282 * @dev: struct device
3283 * @data: module data
3284 * @sysc_flags: module configuration
3285 */
3286static int omap_hwmod_init_sysc_flags(struct device *dev,
3287 const struct ti_sysc_module_data *data,
3288 u32 *sysc_flags)
3289{
3290 *sysc_flags = 0;
3291
3292 switch (data->cap->type) {
3293 case TI_SYSC_OMAP2:
3294 case TI_SYSC_OMAP2_TIMER:
3295 /* See SYSC_OMAP2_* in include/dt-bindings/bus/ti-sysc.h */
3296 if (data->cfg->sysc_val & SYSC_OMAP2_CLOCKACTIVITY)
3297 *sysc_flags |= SYSC_HAS_CLOCKACTIVITY;
3298 if (data->cfg->sysc_val & SYSC_OMAP2_EMUFREE)
3299 *sysc_flags |= SYSC_HAS_EMUFREE;
3300 if (data->cfg->sysc_val & SYSC_OMAP2_ENAWAKEUP)
3301 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3302 if (data->cfg->sysc_val & SYSC_OMAP2_SOFTRESET)
3303 *sysc_flags |= SYSC_HAS_SOFTRESET;
3304 if (data->cfg->sysc_val & SYSC_OMAP2_AUTOIDLE)
3305 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3306 break;
3307 case TI_SYSC_OMAP4:
3308 case TI_SYSC_OMAP4_TIMER:
3309 /* See SYSC_OMAP4_* in include/dt-bindings/bus/ti-sysc.h */
3310 if (data->cfg->sysc_val & SYSC_OMAP4_DMADISABLE)
3311 *sysc_flags |= SYSC_HAS_DMADISABLE;
3312 if (data->cfg->sysc_val & SYSC_OMAP4_FREEEMU)
3313 *sysc_flags |= SYSC_HAS_EMUFREE;
3314 if (data->cfg->sysc_val & SYSC_OMAP4_SOFTRESET)
3315 *sysc_flags |= SYSC_HAS_SOFTRESET;
3316 break;
3317 case TI_SYSC_OMAP34XX_SR:
3318 case TI_SYSC_OMAP36XX_SR:
3319 /* See SYSC_OMAP3_SR_* in include/dt-bindings/bus/ti-sysc.h */
3320 if (data->cfg->sysc_val & SYSC_OMAP3_SR_ENAWAKEUP)
3321 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3322 break;
3323 default:
3324 if (data->cap->regbits->emufree_shift >= 0)
3325 *sysc_flags |= SYSC_HAS_EMUFREE;
3326 if (data->cap->regbits->enwkup_shift >= 0)
3327 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3328 if (data->cap->regbits->srst_shift >= 0)
3329 *sysc_flags |= SYSC_HAS_SOFTRESET;
3330 if (data->cap->regbits->autoidle_shift >= 0)
3331 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3332 break;
3333 }
3334
3335 if (data->cap->regbits->midle_shift >= 0 &&
3336 data->cfg->midlemodes)
3337 *sysc_flags |= SYSC_HAS_MIDLEMODE;
3338
3339 if (data->cap->regbits->sidle_shift >= 0 &&
3340 data->cfg->sidlemodes)
3341 *sysc_flags |= SYSC_HAS_SIDLEMODE;
3342
3343 if (data->cfg->quirks & SYSC_QUIRK_UNCACHED)
3344 *sysc_flags |= SYSC_NO_CACHE;
3345 if (data->cfg->quirks & SYSC_QUIRK_RESET_STATUS)
3346 *sysc_flags |= SYSC_HAS_RESET_STATUS;
3347
3348 if (data->cfg->syss_mask & 1)
3349 *sysc_flags |= SYSS_HAS_RESET_STATUS;
3350
3351 return 0;
3352}
3353
3354/**
3355 * omap_hwmod_init_idlemodes - initialize module idle modes
3356 * @dev: struct device
3357 * @data: module data
3358 * @idlemodes: module supported idle modes
3359 */
3360static int omap_hwmod_init_idlemodes(struct device *dev,
3361 const struct ti_sysc_module_data *data,
3362 u32 *idlemodes)
3363{
3364 *idlemodes = 0;
3365
3366 if (data->cfg->midlemodes & BIT(SYSC_IDLE_FORCE))
3367 *idlemodes |= MSTANDBY_FORCE;
3368 if (data->cfg->midlemodes & BIT(SYSC_IDLE_NO))
3369 *idlemodes |= MSTANDBY_NO;
3370 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART))
3371 *idlemodes |= MSTANDBY_SMART;
3372 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3373 *idlemodes |= MSTANDBY_SMART_WKUP;
3374
3375 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_FORCE))
3376 *idlemodes |= SIDLE_FORCE;
3377 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_NO))
3378 *idlemodes |= SIDLE_NO;
3379 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART))
3380 *idlemodes |= SIDLE_SMART;
3381 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3382 *idlemodes |= SIDLE_SMART_WKUP;
3383
3384 return 0;
3385}
3386
3387/**
3388 * omap_hwmod_check_module - check new module against platform data
3389 * @dev: struct device
3390 * @oh: module
3391 * @data: new module data
3392 * @sysc_fields: sysc register bits
3393 * @rev_offs: revision register offset
3394 * @sysc_offs: sysconfig register offset
3395 * @syss_offs: sysstatus register offset
3396 * @sysc_flags: sysc specific flags
3397 * @idlemodes: sysc supported idlemodes
3398 */
3399static int omap_hwmod_check_module(struct device *dev,
3400 struct omap_hwmod *oh,
3401 const struct ti_sysc_module_data *data,
3402 struct sysc_regbits *sysc_fields,
3403 s32 rev_offs, s32 sysc_offs,
3404 s32 syss_offs, u32 sysc_flags,
3405 u32 idlemodes)
3406{
3407 if (!oh->class->sysc)
3408 return -ENODEV;
3409
3410 if (sysc_fields != oh->class->sysc->sysc_fields)
3411 dev_warn(dev, "sysc_fields %p != %p\n", sysc_fields,
3412 oh->class->sysc->sysc_fields);
3413
3414 if (rev_offs != oh->class->sysc->rev_offs)
3415 dev_warn(dev, "rev_offs %08x != %08x\n", rev_offs,
3416 oh->class->sysc->rev_offs);
3417 if (sysc_offs != oh->class->sysc->sysc_offs)
3418 dev_warn(dev, "sysc_offs %08x != %08x\n", sysc_offs,
3419 oh->class->sysc->sysc_offs);
3420 if (syss_offs != oh->class->sysc->syss_offs)
3421 dev_warn(dev, "syss_offs %08x != %08x\n", syss_offs,
3422 oh->class->sysc->syss_offs);
3423
3424 if (sysc_flags != oh->class->sysc->sysc_flags)
3425 dev_warn(dev, "sysc_flags %08x != %08x\n", sysc_flags,
3426 oh->class->sysc->sysc_flags);
3427
3428 if (idlemodes != oh->class->sysc->idlemodes)
3429 dev_warn(dev, "idlemodes %08x != %08x\n", idlemodes,
3430 oh->class->sysc->idlemodes);
3431
3432 if (data->cfg->srst_udelay != oh->class->sysc->srst_udelay)
3433 dev_warn(dev, "srst_udelay %i != %i\n",
3434 data->cfg->srst_udelay,
3435 oh->class->sysc->srst_udelay);
3436
3437 return 0;
3438}
3439
3440/**
3441 * omap_hwmod_allocate_module - allocate new module
3442 * @dev: struct device
3443 * @oh: module
3444 * @sysc_fields: sysc register bits
3445 * @clockdomain: clockdomain
3446 * @rev_offs: revision register offset
3447 * @sysc_offs: sysconfig register offset
3448 * @syss_offs: sysstatus register offset
3449 * @sysc_flags: sysc specific flags
3450 * @idlemodes: sysc supported idlemodes
3451 *
3452 * Note that the allocations here cannot use devm as ti-sysc can rebind.
3453 */
3454static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
3455 const struct ti_sysc_module_data *data,
3456 struct sysc_regbits *sysc_fields,
3457 struct clockdomain *clkdm,
3458 s32 rev_offs, s32 sysc_offs,
3459 s32 syss_offs, u32 sysc_flags,
3460 u32 idlemodes)
3461{
3462 struct omap_hwmod_class_sysconfig *sysc;
3463 struct omap_hwmod_class *class = NULL;
3464 struct omap_hwmod_ocp_if *oi = NULL;
3465 void __iomem *regs = NULL;
3466 unsigned long flags;
3467
3468 sysc = kzalloc(sizeof(*sysc), GFP_KERNEL);
3469 if (!sysc)
3470 return -ENOMEM;
3471
3472 sysc->sysc_fields = sysc_fields;
3473 sysc->rev_offs = rev_offs;
3474 sysc->sysc_offs = sysc_offs;
3475 sysc->syss_offs = syss_offs;
3476 sysc->sysc_flags = sysc_flags;
3477 sysc->idlemodes = idlemodes;
3478 sysc->srst_udelay = data->cfg->srst_udelay;
3479
3480 if (!oh->_mpu_rt_va) {
3481 regs = ioremap(data->module_pa,
3482 data->module_size);
3483 if (!regs)
3484 return -ENOMEM;
3485 }
3486
3487 /*
3488 * We may need a new oh->class as the other devices in the same class
3489 * may not yet have ioremapped their registers.
3490 */
3491 if (oh->class->name && strcmp(oh->class->name, data->name)) {
3492 class = kmemdup(oh->class, sizeof(*oh->class), GFP_KERNEL);
3493 if (!class)
3494 return -ENOMEM;
3495 }
3496
3497 if (list_empty(&oh->slave_ports)) {
3498 oi = kcalloc(1, sizeof(*oi), GFP_KERNEL);
3499 if (!oi)
3500 return -ENOMEM;
3501
3502 /*
3503 * Note that we assume interconnect interface clocks will be
3504 * managed by the interconnect driver for OCPIF_SWSUP_IDLE case
3505 * on omap24xx and omap3.
3506 */
3507 oi->slave = oh;
3508 oi->user = OCP_USER_MPU | OCP_USER_SDMA;
3509 }
3510
3511 spin_lock_irqsave(&oh->_lock, flags);
3512 if (regs)
3513 oh->_mpu_rt_va = regs;
3514 if (class)
3515 oh->class = class;
3516 oh->class->sysc = sysc;
3517 if (oi)
3518 _add_link(oi);
3519 if (clkdm)
3520 oh->clkdm = clkdm;
3521 oh->_state = _HWMOD_STATE_INITIALIZED;
3522 oh->_postsetup_state = _HWMOD_STATE_DEFAULT;
3523 _setup(oh, NULL);
3524 spin_unlock_irqrestore(&oh->_lock, flags);
3525
3526 return 0;
3527}
3528
3529static const struct omap_hwmod_reset omap24xx_reset_quirks[] = {
3530 { .match = "msdi", .len = 4, .reset = omap_msdi_reset, },
3531};
3532
3533static const struct omap_hwmod_reset dra7_reset_quirks[] = {
3534 { .match = "pcie", .len = 4, .reset = dra7xx_pciess_reset, },
3535};
3536
3537static const struct omap_hwmod_reset omap_reset_quirks[] = {
3538 { .match = "dss", .len = 3, .reset = omap_dss_reset, },
3539 { .match = "hdq1w", .len = 5, .reset = omap_hdq1w_reset, },
3540 { .match = "i2c", .len = 3, .reset = omap_i2c_reset, },
3541 { .match = "wd_timer", .len = 8, .reset = omap2_wd_timer_reset, },
3542};
3543
3544static void
3545omap_hwmod_init_reset_quirk(struct device *dev, struct omap_hwmod *oh,
3546 const struct ti_sysc_module_data *data,
3547 const struct omap_hwmod_reset *quirks,
3548 int quirks_sz)
3549{
3550 const struct omap_hwmod_reset *quirk;
3551 int i;
3552
3553 for (i = 0; i < quirks_sz; i++) {
3554 quirk = &quirks[i];
3555 if (!strncmp(data->name, quirk->match, quirk->len)) {
3556 oh->class->reset = quirk->reset;
3557
3558 return;
3559 }
3560 }
3561}
3562
3563static void
3564omap_hwmod_init_reset_quirks(struct device *dev, struct omap_hwmod *oh,
3565 const struct ti_sysc_module_data *data)
3566{
3567 if (soc_is_omap24xx())
3568 omap_hwmod_init_reset_quirk(dev, oh, data,
3569 omap24xx_reset_quirks,
3570 ARRAY_SIZE(omap24xx_reset_quirks));
3571
3572 if (soc_is_dra7xx())
3573 omap_hwmod_init_reset_quirk(dev, oh, data, dra7_reset_quirks,
3574 ARRAY_SIZE(dra7_reset_quirks));
3575
3576 omap_hwmod_init_reset_quirk(dev, oh, data, omap_reset_quirks,
3577 ARRAY_SIZE(omap_reset_quirks));
3578}
3579
3580/**
3581 * omap_hwmod_init_module - initialize new module
3582 * @dev: struct device
3583 * @data: module data
3584 * @cookie: cookie for the caller to use for later calls
3585 */
3586int omap_hwmod_init_module(struct device *dev,
3587 const struct ti_sysc_module_data *data,
3588 struct ti_sysc_cookie *cookie)
3589{
3590 struct omap_hwmod *oh;
3591 struct sysc_regbits *sysc_fields;
3592 s32 rev_offs, sysc_offs, syss_offs;
3593 u32 sysc_flags, idlemodes;
3594 int error;
3595
3596 if (!dev || !data || !data->name || !cookie)
3597 return -EINVAL;
3598
3599 oh = _lookup(data->name);
3600 if (!oh) {
3601 oh = kzalloc(sizeof(*oh), GFP_KERNEL);
3602 if (!oh)
3603 return -ENOMEM;
3604
3605 oh->name = data->name;
3606 oh->_state = _HWMOD_STATE_UNKNOWN;
3607 lockdep_register_key(&oh->hwmod_key);
3608
3609 /* Unused, can be handled by PRM driver handling resets */
3610 oh->prcm.omap4.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT;
3611
3612 oh->class = kzalloc(sizeof(*oh->class), GFP_KERNEL);
3613 if (!oh->class) {
3614 kfree(oh);
3615 return -ENOMEM;
3616 }
3617
3618 omap_hwmod_init_reset_quirks(dev, oh, data);
3619
3620 oh->class->name = data->name;
3621 mutex_lock(&list_lock);
3622 error = _register(oh);
3623 mutex_unlock(&list_lock);
3624 }
3625
3626 cookie->data = oh;
3627
3628 error = omap_hwmod_init_regbits(dev, data, &sysc_fields);
3629 if (error)
3630 return error;
3631
3632 error = omap_hwmod_init_reg_offs(dev, data, &rev_offs,
3633 &sysc_offs, &syss_offs);
3634 if (error)
3635 return error;
3636
3637 error = omap_hwmod_init_sysc_flags(dev, data, &sysc_flags);
3638 if (error)
3639 return error;
3640
3641 error = omap_hwmod_init_idlemodes(dev, data, &idlemodes);
3642 if (error)
3643 return error;
3644
3645 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE)
3646 oh->flags |= HWMOD_NO_IDLE;
3647 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE_ON_INIT)
3648 oh->flags |= HWMOD_INIT_NO_IDLE;
3649 if (data->cfg->quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
3650 oh->flags |= HWMOD_INIT_NO_RESET;
3651 if (data->cfg->quirks & SYSC_QUIRK_USE_CLOCKACT)
3652 oh->flags |= HWMOD_SET_DEFAULT_CLOCKACT;
3653 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE)
3654 oh->flags |= HWMOD_SWSUP_SIDLE;
3655 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT)
3656 oh->flags |= HWMOD_SWSUP_SIDLE_ACT;
3657 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
3658 oh->flags |= HWMOD_SWSUP_MSTANDBY;
3659
3660 error = omap_hwmod_check_module(dev, oh, data, sysc_fields,
3661 rev_offs, sysc_offs, syss_offs,
3662 sysc_flags, idlemodes);
3663 if (!error)
3664 return error;
3665
3666 return omap_hwmod_allocate_module(dev, oh, data, sysc_fields,
3667 cookie->clkdm, rev_offs,
3668 sysc_offs, syss_offs,
3669 sysc_flags, idlemodes);
3670}
3671
3672/**
3673 * omap_hwmod_setup_earlycon_flags - set up flags for early console
3674 *
3675 * Enable DEBUG_OMAPUART_FLAGS for uart hwmod that is being used as
3676 * early concole so that hwmod core doesn't reset and keep it in idle
3677 * that specific uart.
3678 */
3679#ifdef CONFIG_SERIAL_EARLYCON
3680static void __init omap_hwmod_setup_earlycon_flags(void)
3681{
3682 struct device_node *np;
3683 struct omap_hwmod *oh;
3684 const char *uart;
3685
3686 np = of_find_node_by_path("/chosen");
3687 if (np) {
3688 uart = of_get_property(np, "stdout-path", NULL);
3689 if (uart) {
3690 np = of_find_node_by_path(uart);
3691 if (np) {
3692 uart = of_get_property(np, "ti,hwmods", NULL);
3693 oh = omap_hwmod_lookup(uart);
3694 if (!oh) {
3695 uart = of_get_property(np->parent,
3696 "ti,hwmods",
3697 NULL);
3698 oh = omap_hwmod_lookup(uart);
3699 }
3700 if (oh)
3701 oh->flags |= DEBUG_OMAPUART_FLAGS;
3702 }
3703 }
3704 }
3705}
3706#endif
3707
3708/**
3709 * omap_hwmod_setup_all - set up all registered IP blocks
3710 *
3711 * Initialize and set up all IP blocks registered with the hwmod code.
3712 * Must be called after omap2_clk_init(). Resolves the struct clk
3713 * names to struct clk pointers for each registered omap_hwmod. Also
3714 * calls _setup() on each hwmod. Returns 0 upon success.
3715 */
3716static int __init omap_hwmod_setup_all(void)
3717{
3718 _ensure_mpu_hwmod_is_setup(NULL);
3719
3720 omap_hwmod_for_each(_init, NULL);
3721#ifdef CONFIG_SERIAL_EARLYCON
3722 omap_hwmod_setup_earlycon_flags();
3723#endif
3724 omap_hwmod_for_each(_setup, NULL);
3725
3726 return 0;
3727}
3728omap_postcore_initcall(omap_hwmod_setup_all);
3729
3730/**
3731 * omap_hwmod_enable - enable an omap_hwmod
3732 * @oh: struct omap_hwmod *
3733 *
3734 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3735 * Returns -EINVAL on error or passes along the return value from _enable().
3736 */
3737int omap_hwmod_enable(struct omap_hwmod *oh)
3738{
3739 int r;
3740 unsigned long flags;
3741
3742 if (!oh)
3743 return -EINVAL;
3744
3745 spin_lock_irqsave(&oh->_lock, flags);
3746 r = _enable(oh);
3747 spin_unlock_irqrestore(&oh->_lock, flags);
3748
3749 return r;
3750}
3751
3752/**
3753 * omap_hwmod_idle - idle an omap_hwmod
3754 * @oh: struct omap_hwmod *
3755 *
3756 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3757 * Returns -EINVAL on error or passes along the return value from _idle().
3758 */
3759int omap_hwmod_idle(struct omap_hwmod *oh)
3760{
3761 int r;
3762 unsigned long flags;
3763
3764 if (!oh)
3765 return -EINVAL;
3766
3767 spin_lock_irqsave(&oh->_lock, flags);
3768 r = _idle(oh);
3769 spin_unlock_irqrestore(&oh->_lock, flags);
3770
3771 return r;
3772}
3773
3774/**
3775 * omap_hwmod_shutdown - shutdown an omap_hwmod
3776 * @oh: struct omap_hwmod *
3777 *
3778 * Shutdown an omap_hwmod @oh. Intended to be called by
3779 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3780 * the return value from _shutdown().
3781 */
3782int omap_hwmod_shutdown(struct omap_hwmod *oh)
3783{
3784 int r;
3785 unsigned long flags;
3786
3787 if (!oh)
3788 return -EINVAL;
3789
3790 spin_lock_irqsave(&oh->_lock, flags);
3791 r = _shutdown(oh);
3792 spin_unlock_irqrestore(&oh->_lock, flags);
3793
3794 return r;
3795}
3796
3797/*
3798 * IP block data retrieval functions
3799 */
3800
3801/**
3802 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3803 * @oh: struct omap_hwmod *
3804 *
3805 * Return the powerdomain pointer associated with the OMAP module
3806 * @oh's main clock. If @oh does not have a main clk, return the
3807 * powerdomain associated with the interface clock associated with the
3808 * module's MPU port. (XXX Perhaps this should use the SDMA port
3809 * instead?) Returns NULL on error, or a struct powerdomain * on
3810 * success.
3811 */
3812struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3813{
3814 struct clk *c;
3815 struct omap_hwmod_ocp_if *oi;
3816 struct clockdomain *clkdm;
3817 struct clk_hw_omap *clk;
3818
3819 if (!oh)
3820 return NULL;
3821
3822 if (oh->clkdm)
3823 return oh->clkdm->pwrdm.ptr;
3824
3825 if (oh->_clk) {
3826 c = oh->_clk;
3827 } else {
3828 oi = _find_mpu_rt_port(oh);
3829 if (!oi)
3830 return NULL;
3831 c = oi->_clk;
3832 }
3833
3834 clk = to_clk_hw_omap(__clk_get_hw(c));
3835 clkdm = clk->clkdm;
3836 if (!clkdm)
3837 return NULL;
3838
3839 return clkdm->pwrdm.ptr;
3840}
3841
3842/**
3843 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3844 * @oh: struct omap_hwmod *
3845 *
3846 * Returns the virtual address corresponding to the beginning of the
3847 * module's register target, in the address range that is intended to
3848 * be used by the MPU. Returns the virtual address upon success or NULL
3849 * upon error.
3850 */
3851void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3852{
3853 if (!oh)
3854 return NULL;
3855
3856 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3857 return NULL;
3858
3859 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3860 return NULL;
3861
3862 return oh->_mpu_rt_va;
3863}
3864
3865/*
3866 * XXX what about functions for drivers to save/restore ocp_sysconfig
3867 * for context save/restore operations?
3868 */
3869
3870/**
3871 * omap_hwmod_enable_wakeup - allow device to wake up the system
3872 * @oh: struct omap_hwmod *
3873 *
3874 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3875 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3876 * this IP block if it has dynamic mux entries. Eventually this
3877 * should set PRCM wakeup registers to cause the PRCM to receive
3878 * wakeup events from the module. Does not set any wakeup routing
3879 * registers beyond this point - if the module is to wake up any other
3880 * module or subsystem, that must be set separately. Called by
3881 * omap_device code. Returns -EINVAL on error or 0 upon success.
3882 */
3883int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3884{
3885 unsigned long flags;
3886 u32 v;
3887
3888 spin_lock_irqsave(&oh->_lock, flags);
3889
3890 if (oh->class->sysc &&
3891 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3892 v = oh->_sysc_cache;
3893 _enable_wakeup(oh, &v);
3894 _write_sysconfig(v, oh);
3895 }
3896
3897 spin_unlock_irqrestore(&oh->_lock, flags);
3898
3899 return 0;
3900}
3901
3902/**
3903 * omap_hwmod_disable_wakeup - prevent device from waking the system
3904 * @oh: struct omap_hwmod *
3905 *
3906 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3907 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3908 * events for this IP block if it has dynamic mux entries. Eventually
3909 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3910 * wakeup events from the module. Does not set any wakeup routing
3911 * registers beyond this point - if the module is to wake up any other
3912 * module or subsystem, that must be set separately. Called by
3913 * omap_device code. Returns -EINVAL on error or 0 upon success.
3914 */
3915int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3916{
3917 unsigned long flags;
3918 u32 v;
3919
3920 spin_lock_irqsave(&oh->_lock, flags);
3921
3922 if (oh->class->sysc &&
3923 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3924 v = oh->_sysc_cache;
3925 _disable_wakeup(oh, &v);
3926 _write_sysconfig(v, oh);
3927 }
3928
3929 spin_unlock_irqrestore(&oh->_lock, flags);
3930
3931 return 0;
3932}
3933
3934/**
3935 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3936 * contained in the hwmod module.
3937 * @oh: struct omap_hwmod *
3938 * @name: name of the reset line to lookup and assert
3939 *
3940 * Some IP like dsp, ipu or iva contain processor that require
3941 * an HW reset line to be assert / deassert in order to enable fully
3942 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3943 * yet supported on this OMAP; otherwise, passes along the return value
3944 * from _assert_hardreset().
3945 */
3946int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3947{
3948 int ret;
3949 unsigned long flags;
3950
3951 if (!oh)
3952 return -EINVAL;
3953
3954 spin_lock_irqsave(&oh->_lock, flags);
3955 ret = _assert_hardreset(oh, name);
3956 spin_unlock_irqrestore(&oh->_lock, flags);
3957
3958 return ret;
3959}
3960
3961/**
3962 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3963 * contained in the hwmod module.
3964 * @oh: struct omap_hwmod *
3965 * @name: name of the reset line to look up and deassert
3966 *
3967 * Some IP like dsp, ipu or iva contain processor that require
3968 * an HW reset line to be assert / deassert in order to enable fully
3969 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3970 * yet supported on this OMAP; otherwise, passes along the return value
3971 * from _deassert_hardreset().
3972 */
3973int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3974{
3975 int ret;
3976 unsigned long flags;
3977
3978 if (!oh)
3979 return -EINVAL;
3980
3981 spin_lock_irqsave(&oh->_lock, flags);
3982 ret = _deassert_hardreset(oh, name);
3983 spin_unlock_irqrestore(&oh->_lock, flags);
3984
3985 return ret;
3986}
3987
3988/**
3989 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3990 * @classname: struct omap_hwmod_class name to search for
3991 * @fn: callback function pointer to call for each hwmod in class @classname
3992 * @user: arbitrary context data to pass to the callback function
3993 *
3994 * For each omap_hwmod of class @classname, call @fn.
3995 * If the callback function returns something other than
3996 * zero, the iterator is terminated, and the callback function's return
3997 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3998 * if @classname or @fn are NULL, or passes back the error code from @fn.
3999 */
4000int omap_hwmod_for_each_by_class(const char *classname,
4001 int (*fn)(struct omap_hwmod *oh,
4002 void *user),
4003 void *user)
4004{
4005 struct omap_hwmod *temp_oh;
4006 int ret = 0;
4007
4008 if (!classname || !fn)
4009 return -EINVAL;
4010
4011 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
4012 __func__, classname);
4013
4014 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
4015 if (!strcmp(temp_oh->class->name, classname)) {
4016 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
4017 __func__, temp_oh->name);
4018 ret = (*fn)(temp_oh, user);
4019 if (ret)
4020 break;
4021 }
4022 }
4023
4024 if (ret)
4025 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
4026 __func__, ret);
4027
4028 return ret;
4029}
4030
4031/**
4032 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
4033 * @oh: struct omap_hwmod *
4034 * @state: state that _setup() should leave the hwmod in
4035 *
4036 * Sets the hwmod state that @oh will enter at the end of _setup()
4037 * (called by omap_hwmod_setup_*()). See also the documentation
4038 * for _setup_postsetup(), above. Returns 0 upon success or
4039 * -EINVAL if there is a problem with the arguments or if the hwmod is
4040 * in the wrong state.
4041 */
4042int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
4043{
4044 int ret;
4045 unsigned long flags;
4046
4047 if (!oh)
4048 return -EINVAL;
4049
4050 if (state != _HWMOD_STATE_DISABLED &&
4051 state != _HWMOD_STATE_ENABLED &&
4052 state != _HWMOD_STATE_IDLE)
4053 return -EINVAL;
4054
4055 spin_lock_irqsave(&oh->_lock, flags);
4056
4057 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4058 ret = -EINVAL;
4059 goto ohsps_unlock;
4060 }
4061
4062 oh->_postsetup_state = state;
4063 ret = 0;
4064
4065ohsps_unlock:
4066 spin_unlock_irqrestore(&oh->_lock, flags);
4067
4068 return ret;
4069}
4070
4071/**
4072 * omap_hwmod_get_context_loss_count - get lost context count
4073 * @oh: struct omap_hwmod *
4074 *
4075 * Returns the context loss count of associated @oh
4076 * upon success, or zero if no context loss data is available.
4077 *
4078 * On OMAP4, this queries the per-hwmod context loss register,
4079 * assuming one exists. If not, or on OMAP2/3, this queries the
4080 * enclosing powerdomain context loss count.
4081 */
4082int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
4083{
4084 struct powerdomain *pwrdm;
4085 int ret = 0;
4086
4087 if (soc_ops.get_context_lost)
4088 return soc_ops.get_context_lost(oh);
4089
4090 pwrdm = omap_hwmod_get_pwrdm(oh);
4091 if (pwrdm)
4092 ret = pwrdm_get_context_loss_count(pwrdm);
4093
4094 return ret;
4095}
4096
4097/**
4098 * omap_hwmod_init - initialize the hwmod code
4099 *
4100 * Sets up some function pointers needed by the hwmod code to operate on the
4101 * currently-booted SoC. Intended to be called once during kernel init
4102 * before any hwmods are registered. No return value.
4103 */
4104void __init omap_hwmod_init(void)
4105{
4106 if (cpu_is_omap24xx()) {
4107 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4108 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4109 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4110 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4111 } else if (cpu_is_omap34xx()) {
4112 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4113 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4114 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4115 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4116 soc_ops.init_clkdm = _init_clkdm;
4117 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
4118 soc_ops.enable_module = _omap4_enable_module;
4119 soc_ops.disable_module = _omap4_disable_module;
4120 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4121 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4122 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4123 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4124 soc_ops.init_clkdm = _init_clkdm;
4125 soc_ops.update_context_lost = _omap4_update_context_lost;
4126 soc_ops.get_context_lost = _omap4_get_context_lost;
4127 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4128 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4129 } else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
4130 soc_is_am43xx()) {
4131 soc_ops.enable_module = _omap4_enable_module;
4132 soc_ops.disable_module = _omap4_disable_module;
4133 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4134 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4135 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4136 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4137 soc_ops.init_clkdm = _init_clkdm;
4138 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4139 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4140 } else {
4141 WARN(1, "omap_hwmod: unknown SoC type\n");
4142 }
4143
4144 _init_clkctrl_providers();
4145
4146 inited = true;
4147}
4148
4149/**
4150 * omap_hwmod_get_main_clk - get pointer to main clock name
4151 * @oh: struct omap_hwmod *
4152 *
4153 * Returns the main clock name assocated with @oh upon success,
4154 * or NULL if @oh is NULL.
4155 */
4156const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4157{
4158 if (!oh)
4159 return NULL;
4160
4161 return oh->main_clk;
4162}