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1/*
2 * omap_hwmod implementation for OMAP2/3/4
3 *
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011 Texas Instruments, Inc.
6 *
7 * Paul Walmsley, Benoît Cousson, Kevin Hilman
8 *
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 * Introduction
18 * ------------
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
27 *
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
34 *
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
43 *
44 * Using hwmod
45 * -----------
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
53 *
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
56 *
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
77 *
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
83 * platforms.
84 *
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
90 * bugs.
91 *
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
103 *
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
108 * functions.
109 *
110 * References
111 * ----------
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
118 *
119 * To do:
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
122 *
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
126 * appropriate
127 */
128#undef DEBUG
129
130#include <linux/kernel.h>
131#include <linux/errno.h>
132#include <linux/io.h>
133#include <linux/clk.h>
134#include <linux/delay.h>
135#include <linux/err.h>
136#include <linux/list.h>
137#include <linux/mutex.h>
138#include <linux/spinlock.h>
139
140#include <plat/common.h>
141#include <plat/cpu.h>
142#include "clockdomain.h"
143#include "powerdomain.h"
144#include <plat/clock.h>
145#include <plat/omap_hwmod.h>
146#include <plat/prcm.h>
147
148#include "cm2xxx_3xxx.h"
149#include "cminst44xx.h"
150#include "prm2xxx_3xxx.h"
151#include "prm44xx.h"
152#include "prminst44xx.h"
153#include "mux.h"
154
155/* Maximum microseconds to wait for OMAP module to softreset */
156#define MAX_MODULE_SOFTRESET_WAIT 10000
157
158/* Name of the OMAP hwmod for the MPU */
159#define MPU_INITIATOR_NAME "mpu"
160
161/* omap_hwmod_list contains all registered struct omap_hwmods */
162static LIST_HEAD(omap_hwmod_list);
163
164/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
165static struct omap_hwmod *mpu_oh;
166
167
168/* Private functions */
169
170/**
171 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
172 * @oh: struct omap_hwmod *
173 *
174 * Load the current value of the hwmod OCP_SYSCONFIG register into the
175 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
176 * OCP_SYSCONFIG register or 0 upon success.
177 */
178static int _update_sysc_cache(struct omap_hwmod *oh)
179{
180 if (!oh->class->sysc) {
181 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
182 return -EINVAL;
183 }
184
185 /* XXX ensure module interface clock is up */
186
187 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
188
189 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
190 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
191
192 return 0;
193}
194
195/**
196 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
197 * @v: OCP_SYSCONFIG value to write
198 * @oh: struct omap_hwmod *
199 *
200 * Write @v into the module class' OCP_SYSCONFIG register, if it has
201 * one. No return value.
202 */
203static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
204{
205 if (!oh->class->sysc) {
206 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
207 return;
208 }
209
210 /* XXX ensure module interface clock is up */
211
212 /* Module might have lost context, always update cache and register */
213 oh->_sysc_cache = v;
214 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
215}
216
217/**
218 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
219 * @oh: struct omap_hwmod *
220 * @standbymode: MIDLEMODE field bits
221 * @v: pointer to register contents to modify
222 *
223 * Update the master standby mode bits in @v to be @standbymode for
224 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
225 * upon error or 0 upon success.
226 */
227static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
228 u32 *v)
229{
230 u32 mstandby_mask;
231 u8 mstandby_shift;
232
233 if (!oh->class->sysc ||
234 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
235 return -EINVAL;
236
237 if (!oh->class->sysc->sysc_fields) {
238 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
239 return -EINVAL;
240 }
241
242 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
243 mstandby_mask = (0x3 << mstandby_shift);
244
245 *v &= ~mstandby_mask;
246 *v |= __ffs(standbymode) << mstandby_shift;
247
248 return 0;
249}
250
251/**
252 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
253 * @oh: struct omap_hwmod *
254 * @idlemode: SIDLEMODE field bits
255 * @v: pointer to register contents to modify
256 *
257 * Update the slave idle mode bits in @v to be @idlemode for the @oh
258 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
259 * or 0 upon success.
260 */
261static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
262{
263 u32 sidle_mask;
264 u8 sidle_shift;
265
266 if (!oh->class->sysc ||
267 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
268 return -EINVAL;
269
270 if (!oh->class->sysc->sysc_fields) {
271 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
272 return -EINVAL;
273 }
274
275 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
276 sidle_mask = (0x3 << sidle_shift);
277
278 *v &= ~sidle_mask;
279 *v |= __ffs(idlemode) << sidle_shift;
280
281 return 0;
282}
283
284/**
285 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
286 * @oh: struct omap_hwmod *
287 * @clockact: CLOCKACTIVITY field bits
288 * @v: pointer to register contents to modify
289 *
290 * Update the clockactivity mode bits in @v to be @clockact for the
291 * @oh hwmod. Used for additional powersaving on some modules. Does
292 * not write to the hardware. Returns -EINVAL upon error or 0 upon
293 * success.
294 */
295static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
296{
297 u32 clkact_mask;
298 u8 clkact_shift;
299
300 if (!oh->class->sysc ||
301 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
302 return -EINVAL;
303
304 if (!oh->class->sysc->sysc_fields) {
305 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
306 return -EINVAL;
307 }
308
309 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
310 clkact_mask = (0x3 << clkact_shift);
311
312 *v &= ~clkact_mask;
313 *v |= clockact << clkact_shift;
314
315 return 0;
316}
317
318/**
319 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
320 * @oh: struct omap_hwmod *
321 * @v: pointer to register contents to modify
322 *
323 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
324 * error or 0 upon success.
325 */
326static int _set_softreset(struct omap_hwmod *oh, u32 *v)
327{
328 u32 softrst_mask;
329
330 if (!oh->class->sysc ||
331 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
332 return -EINVAL;
333
334 if (!oh->class->sysc->sysc_fields) {
335 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
336 return -EINVAL;
337 }
338
339 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
340
341 *v |= softrst_mask;
342
343 return 0;
344}
345
346/**
347 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
348 * @oh: struct omap_hwmod *
349 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
350 * @v: pointer to register contents to modify
351 *
352 * Update the module autoidle bit in @v to be @autoidle for the @oh
353 * hwmod. The autoidle bit controls whether the module can gate
354 * internal clocks automatically when it isn't doing anything; the
355 * exact function of this bit varies on a per-module basis. This
356 * function does not write to the hardware. Returns -EINVAL upon
357 * error or 0 upon success.
358 */
359static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
360 u32 *v)
361{
362 u32 autoidle_mask;
363 u8 autoidle_shift;
364
365 if (!oh->class->sysc ||
366 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
367 return -EINVAL;
368
369 if (!oh->class->sysc->sysc_fields) {
370 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
371 return -EINVAL;
372 }
373
374 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
375 autoidle_mask = (0x1 << autoidle_shift);
376
377 *v &= ~autoidle_mask;
378 *v |= autoidle << autoidle_shift;
379
380 return 0;
381}
382
383/**
384 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
385 * @oh: struct omap_hwmod *
386 *
387 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
388 * upon error or 0 upon success.
389 */
390static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
391{
392 if (!oh->class->sysc ||
393 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
394 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
395 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
396 return -EINVAL;
397
398 if (!oh->class->sysc->sysc_fields) {
399 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
400 return -EINVAL;
401 }
402
403 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
404 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
405
406 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
407 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
408 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
409 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
410
411 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
412
413 oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
414
415 return 0;
416}
417
418/**
419 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
420 * @oh: struct omap_hwmod *
421 *
422 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
423 * upon error or 0 upon success.
424 */
425static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
426{
427 if (!oh->class->sysc ||
428 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
429 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
430 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
431 return -EINVAL;
432
433 if (!oh->class->sysc->sysc_fields) {
434 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
435 return -EINVAL;
436 }
437
438 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
439 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
440
441 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
442 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
443 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
444 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
445
446 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
447
448 oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
449
450 return 0;
451}
452
453/**
454 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
455 * @oh: struct omap_hwmod *
456 *
457 * Prevent the hardware module @oh from entering idle while the
458 * hardare module initiator @init_oh is active. Useful when a module
459 * will be accessed by a particular initiator (e.g., if a module will
460 * be accessed by the IVA, there should be a sleepdep between the IVA
461 * initiator and the module). Only applies to modules in smart-idle
462 * mode. If the clockdomain is marked as not needing autodeps, return
463 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
464 * passes along clkdm_add_sleepdep() value upon success.
465 */
466static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
467{
468 if (!oh->_clk)
469 return -EINVAL;
470
471 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
472 return 0;
473
474 return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
475}
476
477/**
478 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
479 * @oh: struct omap_hwmod *
480 *
481 * Allow the hardware module @oh to enter idle while the hardare
482 * module initiator @init_oh is active. Useful when a module will not
483 * be accessed by a particular initiator (e.g., if a module will not
484 * be accessed by the IVA, there should be no sleepdep between the IVA
485 * initiator and the module). Only applies to modules in smart-idle
486 * mode. If the clockdomain is marked as not needing autodeps, return
487 * 0 without doing anything. Returns -EINVAL upon error or passes
488 * along clkdm_del_sleepdep() value upon success.
489 */
490static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
491{
492 if (!oh->_clk)
493 return -EINVAL;
494
495 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
496 return 0;
497
498 return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
499}
500
501/**
502 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
503 * @oh: struct omap_hwmod *
504 *
505 * Called from _init_clocks(). Populates the @oh _clk (main
506 * functional clock pointer) if a main_clk is present. Returns 0 on
507 * success or -EINVAL on error.
508 */
509static int _init_main_clk(struct omap_hwmod *oh)
510{
511 int ret = 0;
512
513 if (!oh->main_clk)
514 return 0;
515
516 oh->_clk = omap_clk_get_by_name(oh->main_clk);
517 if (!oh->_clk) {
518 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
519 oh->name, oh->main_clk);
520 return -EINVAL;
521 }
522
523 if (!oh->_clk->clkdm)
524 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
525 oh->main_clk, oh->_clk->name);
526
527 return ret;
528}
529
530/**
531 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
532 * @oh: struct omap_hwmod *
533 *
534 * Called from _init_clocks(). Populates the @oh OCP slave interface
535 * clock pointers. Returns 0 on success or -EINVAL on error.
536 */
537static int _init_interface_clks(struct omap_hwmod *oh)
538{
539 struct clk *c;
540 int i;
541 int ret = 0;
542
543 if (oh->slaves_cnt == 0)
544 return 0;
545
546 for (i = 0; i < oh->slaves_cnt; i++) {
547 struct omap_hwmod_ocp_if *os = oh->slaves[i];
548
549 if (!os->clk)
550 continue;
551
552 c = omap_clk_get_by_name(os->clk);
553 if (!c) {
554 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
555 oh->name, os->clk);
556 ret = -EINVAL;
557 }
558 os->_clk = c;
559 }
560
561 return ret;
562}
563
564/**
565 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
566 * @oh: struct omap_hwmod *
567 *
568 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
569 * clock pointers. Returns 0 on success or -EINVAL on error.
570 */
571static int _init_opt_clks(struct omap_hwmod *oh)
572{
573 struct omap_hwmod_opt_clk *oc;
574 struct clk *c;
575 int i;
576 int ret = 0;
577
578 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
579 c = omap_clk_get_by_name(oc->clk);
580 if (!c) {
581 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
582 oh->name, oc->clk);
583 ret = -EINVAL;
584 }
585 oc->_clk = c;
586 }
587
588 return ret;
589}
590
591/**
592 * _enable_clocks - enable hwmod main clock and interface clocks
593 * @oh: struct omap_hwmod *
594 *
595 * Enables all clocks necessary for register reads and writes to succeed
596 * on the hwmod @oh. Returns 0.
597 */
598static int _enable_clocks(struct omap_hwmod *oh)
599{
600 int i;
601
602 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
603
604 if (oh->_clk)
605 clk_enable(oh->_clk);
606
607 if (oh->slaves_cnt > 0) {
608 for (i = 0; i < oh->slaves_cnt; i++) {
609 struct omap_hwmod_ocp_if *os = oh->slaves[i];
610 struct clk *c = os->_clk;
611
612 if (c && (os->flags & OCPIF_SWSUP_IDLE))
613 clk_enable(c);
614 }
615 }
616
617 /* The opt clocks are controlled by the device driver. */
618
619 return 0;
620}
621
622/**
623 * _disable_clocks - disable hwmod main clock and interface clocks
624 * @oh: struct omap_hwmod *
625 *
626 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
627 */
628static int _disable_clocks(struct omap_hwmod *oh)
629{
630 int i;
631
632 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
633
634 if (oh->_clk)
635 clk_disable(oh->_clk);
636
637 if (oh->slaves_cnt > 0) {
638 for (i = 0; i < oh->slaves_cnt; i++) {
639 struct omap_hwmod_ocp_if *os = oh->slaves[i];
640 struct clk *c = os->_clk;
641
642 if (c && (os->flags & OCPIF_SWSUP_IDLE))
643 clk_disable(c);
644 }
645 }
646
647 /* The opt clocks are controlled by the device driver. */
648
649 return 0;
650}
651
652static void _enable_optional_clocks(struct omap_hwmod *oh)
653{
654 struct omap_hwmod_opt_clk *oc;
655 int i;
656
657 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
658
659 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
660 if (oc->_clk) {
661 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
662 oc->_clk->name);
663 clk_enable(oc->_clk);
664 }
665}
666
667static void _disable_optional_clocks(struct omap_hwmod *oh)
668{
669 struct omap_hwmod_opt_clk *oc;
670 int i;
671
672 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
673
674 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
675 if (oc->_clk) {
676 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
677 oc->_clk->name);
678 clk_disable(oc->_clk);
679 }
680}
681
682/**
683 * _enable_module - enable CLKCTRL modulemode on OMAP4
684 * @oh: struct omap_hwmod *
685 *
686 * Enables the PRCM module mode related to the hwmod @oh.
687 * No return value.
688 */
689static void _enable_module(struct omap_hwmod *oh)
690{
691 /* The module mode does not exist prior OMAP4 */
692 if (cpu_is_omap24xx() || cpu_is_omap34xx())
693 return;
694
695 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
696 return;
697
698 pr_debug("omap_hwmod: %s: _enable_module: %d\n",
699 oh->name, oh->prcm.omap4.modulemode);
700
701 omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
702 oh->clkdm->prcm_partition,
703 oh->clkdm->cm_inst,
704 oh->clkdm->clkdm_offs,
705 oh->prcm.omap4.clkctrl_offs);
706}
707
708/**
709 * _disable_module - enable CLKCTRL modulemode on OMAP4
710 * @oh: struct omap_hwmod *
711 *
712 * Disable the PRCM module mode related to the hwmod @oh.
713 * No return value.
714 */
715static void _disable_module(struct omap_hwmod *oh)
716{
717 /* The module mode does not exist prior OMAP4 */
718 if (cpu_is_omap24xx() || cpu_is_omap34xx())
719 return;
720
721 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
722 return;
723
724 pr_debug("omap_hwmod: %s: _disable_module\n", oh->name);
725
726 omap4_cminst_module_disable(oh->clkdm->prcm_partition,
727 oh->clkdm->cm_inst,
728 oh->clkdm->clkdm_offs,
729 oh->prcm.omap4.clkctrl_offs);
730}
731
732/**
733 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
734 * @oh: struct omap_hwmod *oh
735 *
736 * Count and return the number of MPU IRQs associated with the hwmod
737 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
738 * NULL.
739 */
740static int _count_mpu_irqs(struct omap_hwmod *oh)
741{
742 struct omap_hwmod_irq_info *ohii;
743 int i = 0;
744
745 if (!oh || !oh->mpu_irqs)
746 return 0;
747
748 do {
749 ohii = &oh->mpu_irqs[i++];
750 } while (ohii->irq != -1);
751
752 return i;
753}
754
755/**
756 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
757 * @oh: struct omap_hwmod *oh
758 *
759 * Count and return the number of SDMA request lines associated with
760 * the hwmod @oh. Used to allocate struct resource data. Returns 0
761 * if @oh is NULL.
762 */
763static int _count_sdma_reqs(struct omap_hwmod *oh)
764{
765 struct omap_hwmod_dma_info *ohdi;
766 int i = 0;
767
768 if (!oh || !oh->sdma_reqs)
769 return 0;
770
771 do {
772 ohdi = &oh->sdma_reqs[i++];
773 } while (ohdi->dma_req != -1);
774
775 return i;
776}
777
778/**
779 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
780 * @oh: struct omap_hwmod *oh
781 *
782 * Count and return the number of address space ranges associated with
783 * the hwmod @oh. Used to allocate struct resource data. Returns 0
784 * if @oh is NULL.
785 */
786static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
787{
788 struct omap_hwmod_addr_space *mem;
789 int i = 0;
790
791 if (!os || !os->addr)
792 return 0;
793
794 do {
795 mem = &os->addr[i++];
796 } while (mem->pa_start != mem->pa_end);
797
798 return i;
799}
800
801/**
802 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
803 * @oh: struct omap_hwmod *
804 *
805 * Returns the array index of the OCP slave port that the MPU
806 * addresses the device on, or -EINVAL upon error or not found.
807 */
808static int __init _find_mpu_port_index(struct omap_hwmod *oh)
809{
810 int i;
811 int found = 0;
812
813 if (!oh || oh->slaves_cnt == 0)
814 return -EINVAL;
815
816 for (i = 0; i < oh->slaves_cnt; i++) {
817 struct omap_hwmod_ocp_if *os = oh->slaves[i];
818
819 if (os->user & OCP_USER_MPU) {
820 found = 1;
821 break;
822 }
823 }
824
825 if (found)
826 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
827 oh->name, i);
828 else
829 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
830 oh->name);
831
832 return (found) ? i : -EINVAL;
833}
834
835/**
836 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
837 * @oh: struct omap_hwmod *
838 *
839 * Return the virtual address of the base of the register target of
840 * device @oh, or NULL on error.
841 */
842static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
843{
844 struct omap_hwmod_ocp_if *os;
845 struct omap_hwmod_addr_space *mem;
846 int i = 0, found = 0;
847 void __iomem *va_start;
848
849 if (!oh || oh->slaves_cnt == 0)
850 return NULL;
851
852 os = oh->slaves[index];
853
854 if (!os->addr)
855 return NULL;
856
857 do {
858 mem = &os->addr[i++];
859 if (mem->flags & ADDR_TYPE_RT)
860 found = 1;
861 } while (!found && mem->pa_start != mem->pa_end);
862
863 if (found) {
864 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
865 if (!va_start) {
866 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
867 return NULL;
868 }
869 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
870 oh->name, va_start);
871 } else {
872 pr_debug("omap_hwmod: %s: no MPU register target found\n",
873 oh->name);
874 }
875
876 return (found) ? va_start : NULL;
877}
878
879/**
880 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
881 * @oh: struct omap_hwmod *
882 *
883 * If module is marked as SWSUP_SIDLE, force the module out of slave
884 * idle; otherwise, configure it for smart-idle. If module is marked
885 * as SWSUP_MSUSPEND, force the module out of master standby;
886 * otherwise, configure it for smart-standby. No return value.
887 */
888static void _enable_sysc(struct omap_hwmod *oh)
889{
890 u8 idlemode, sf;
891 u32 v;
892
893 if (!oh->class->sysc)
894 return;
895
896 v = oh->_sysc_cache;
897 sf = oh->class->sysc->sysc_flags;
898
899 if (sf & SYSC_HAS_SIDLEMODE) {
900 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
901 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
902 _set_slave_idlemode(oh, idlemode, &v);
903 }
904
905 if (sf & SYSC_HAS_MIDLEMODE) {
906 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
907 idlemode = HWMOD_IDLEMODE_NO;
908 } else {
909 if (sf & SYSC_HAS_ENAWAKEUP)
910 _enable_wakeup(oh, &v);
911 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
912 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
913 else
914 idlemode = HWMOD_IDLEMODE_SMART;
915 }
916 _set_master_standbymode(oh, idlemode, &v);
917 }
918
919 /*
920 * XXX The clock framework should handle this, by
921 * calling into this code. But this must wait until the
922 * clock structures are tagged with omap_hwmod entries
923 */
924 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
925 (sf & SYSC_HAS_CLOCKACTIVITY))
926 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
927
928 /* If slave is in SMARTIDLE, also enable wakeup */
929 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
930 _enable_wakeup(oh, &v);
931
932 _write_sysconfig(v, oh);
933
934 /*
935 * Set the autoidle bit only after setting the smartidle bit
936 * Setting this will not have any impact on the other modules.
937 */
938 if (sf & SYSC_HAS_AUTOIDLE) {
939 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
940 0 : 1;
941 _set_module_autoidle(oh, idlemode, &v);
942 _write_sysconfig(v, oh);
943 }
944}
945
946/**
947 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
948 * @oh: struct omap_hwmod *
949 *
950 * If module is marked as SWSUP_SIDLE, force the module into slave
951 * idle; otherwise, configure it for smart-idle. If module is marked
952 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
953 * configure it for smart-standby. No return value.
954 */
955static void _idle_sysc(struct omap_hwmod *oh)
956{
957 u8 idlemode, sf;
958 u32 v;
959
960 if (!oh->class->sysc)
961 return;
962
963 v = oh->_sysc_cache;
964 sf = oh->class->sysc->sysc_flags;
965
966 if (sf & SYSC_HAS_SIDLEMODE) {
967 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
968 HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
969 _set_slave_idlemode(oh, idlemode, &v);
970 }
971
972 if (sf & SYSC_HAS_MIDLEMODE) {
973 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
974 idlemode = HWMOD_IDLEMODE_FORCE;
975 } else {
976 if (sf & SYSC_HAS_ENAWAKEUP)
977 _enable_wakeup(oh, &v);
978 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
979 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
980 else
981 idlemode = HWMOD_IDLEMODE_SMART;
982 }
983 _set_master_standbymode(oh, idlemode, &v);
984 }
985
986 /* If slave is in SMARTIDLE, also enable wakeup */
987 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
988 _enable_wakeup(oh, &v);
989
990 _write_sysconfig(v, oh);
991}
992
993/**
994 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
995 * @oh: struct omap_hwmod *
996 *
997 * Force the module into slave idle and master suspend. No return
998 * value.
999 */
1000static void _shutdown_sysc(struct omap_hwmod *oh)
1001{
1002 u32 v;
1003 u8 sf;
1004
1005 if (!oh->class->sysc)
1006 return;
1007
1008 v = oh->_sysc_cache;
1009 sf = oh->class->sysc->sysc_flags;
1010
1011 if (sf & SYSC_HAS_SIDLEMODE)
1012 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1013
1014 if (sf & SYSC_HAS_MIDLEMODE)
1015 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1016
1017 if (sf & SYSC_HAS_AUTOIDLE)
1018 _set_module_autoidle(oh, 1, &v);
1019
1020 _write_sysconfig(v, oh);
1021}
1022
1023/**
1024 * _lookup - find an omap_hwmod by name
1025 * @name: find an omap_hwmod by name
1026 *
1027 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1028 */
1029static struct omap_hwmod *_lookup(const char *name)
1030{
1031 struct omap_hwmod *oh, *temp_oh;
1032
1033 oh = NULL;
1034
1035 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1036 if (!strcmp(name, temp_oh->name)) {
1037 oh = temp_oh;
1038 break;
1039 }
1040 }
1041
1042 return oh;
1043}
1044/**
1045 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1046 * @oh: struct omap_hwmod *
1047 *
1048 * Convert a clockdomain name stored in a struct omap_hwmod into a
1049 * clockdomain pointer, and save it into the struct omap_hwmod.
1050 * return -EINVAL if clkdm_name does not exist or if the lookup failed.
1051 */
1052static int _init_clkdm(struct omap_hwmod *oh)
1053{
1054 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1055 return 0;
1056
1057 if (!oh->clkdm_name) {
1058 pr_warning("omap_hwmod: %s: no clkdm_name\n", oh->name);
1059 return -EINVAL;
1060 }
1061
1062 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1063 if (!oh->clkdm) {
1064 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1065 oh->name, oh->clkdm_name);
1066 return -EINVAL;
1067 }
1068
1069 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1070 oh->name, oh->clkdm_name);
1071
1072 return 0;
1073}
1074
1075/**
1076 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1077 * well the clockdomain.
1078 * @oh: struct omap_hwmod *
1079 * @data: not used; pass NULL
1080 *
1081 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1082 * Resolves all clock names embedded in the hwmod. Returns 0 on
1083 * success, or a negative error code on failure.
1084 */
1085static int _init_clocks(struct omap_hwmod *oh, void *data)
1086{
1087 int ret = 0;
1088
1089 if (oh->_state != _HWMOD_STATE_REGISTERED)
1090 return 0;
1091
1092 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1093
1094 ret |= _init_main_clk(oh);
1095 ret |= _init_interface_clks(oh);
1096 ret |= _init_opt_clks(oh);
1097 ret |= _init_clkdm(oh);
1098
1099 if (!ret)
1100 oh->_state = _HWMOD_STATE_CLKS_INITED;
1101 else
1102 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1103
1104 return ret;
1105}
1106
1107/**
1108 * _wait_target_ready - wait for a module to leave slave idle
1109 * @oh: struct omap_hwmod *
1110 *
1111 * Wait for a module @oh to leave slave idle. Returns 0 if the module
1112 * does not have an IDLEST bit or if the module successfully leaves
1113 * slave idle; otherwise, pass along the return value of the
1114 * appropriate *_cm*_wait_module_ready() function.
1115 */
1116static int _wait_target_ready(struct omap_hwmod *oh)
1117{
1118 struct omap_hwmod_ocp_if *os;
1119 int ret;
1120
1121 if (!oh)
1122 return -EINVAL;
1123
1124 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1125 return 0;
1126
1127 os = oh->slaves[oh->_mpu_port_index];
1128
1129 if (oh->flags & HWMOD_NO_IDLEST)
1130 return 0;
1131
1132 /* XXX check module SIDLEMODE */
1133
1134 /* XXX check clock enable states */
1135
1136 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1137 ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
1138 oh->prcm.omap2.idlest_reg_id,
1139 oh->prcm.omap2.idlest_idle_bit);
1140 } else if (cpu_is_omap44xx()) {
1141 if (!oh->clkdm)
1142 return -EINVAL;
1143
1144 ret = omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
1145 oh->clkdm->cm_inst,
1146 oh->clkdm->clkdm_offs,
1147 oh->prcm.omap4.clkctrl_offs);
1148 } else {
1149 BUG();
1150 };
1151
1152 return ret;
1153}
1154
1155/**
1156 * _wait_target_disable - wait for a module to be disabled
1157 * @oh: struct omap_hwmod *
1158 *
1159 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1160 * does not have an IDLEST bit or if the module successfully enters
1161 * slave idle; otherwise, pass along the return value of the
1162 * appropriate *_cm*_wait_module_idle() function.
1163 */
1164static int _wait_target_disable(struct omap_hwmod *oh)
1165{
1166 /* TODO: For now just handle OMAP4+ */
1167 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1168 return 0;
1169
1170 if (!oh)
1171 return -EINVAL;
1172
1173 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1174 return 0;
1175
1176 if (oh->flags & HWMOD_NO_IDLEST)
1177 return 0;
1178
1179 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
1180 oh->clkdm->cm_inst,
1181 oh->clkdm->clkdm_offs,
1182 oh->prcm.omap4.clkctrl_offs);
1183}
1184
1185/**
1186 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1187 * @oh: struct omap_hwmod *
1188 * @name: name of the reset line in the context of this hwmod
1189 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1190 *
1191 * Return the bit position of the reset line that match the
1192 * input name. Return -ENOENT if not found.
1193 */
1194static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1195 struct omap_hwmod_rst_info *ohri)
1196{
1197 int i;
1198
1199 for (i = 0; i < oh->rst_lines_cnt; i++) {
1200 const char *rst_line = oh->rst_lines[i].name;
1201 if (!strcmp(rst_line, name)) {
1202 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1203 ohri->st_shift = oh->rst_lines[i].st_shift;
1204 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1205 oh->name, __func__, rst_line, ohri->rst_shift,
1206 ohri->st_shift);
1207
1208 return 0;
1209 }
1210 }
1211
1212 return -ENOENT;
1213}
1214
1215/**
1216 * _assert_hardreset - assert the HW reset line of submodules
1217 * contained in the hwmod module.
1218 * @oh: struct omap_hwmod *
1219 * @name: name of the reset line to lookup and assert
1220 *
1221 * Some IP like dsp, ipu or iva contain processor that require
1222 * an HW reset line to be assert / deassert in order to enable fully
1223 * the IP.
1224 */
1225static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1226{
1227 struct omap_hwmod_rst_info ohri;
1228 u8 ret;
1229
1230 if (!oh)
1231 return -EINVAL;
1232
1233 ret = _lookup_hardreset(oh, name, &ohri);
1234 if (IS_ERR_VALUE(ret))
1235 return ret;
1236
1237 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1238 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
1239 ohri.rst_shift);
1240 else if (cpu_is_omap44xx())
1241 return omap4_prminst_assert_hardreset(ohri.rst_shift,
1242 oh->clkdm->pwrdm.ptr->prcm_partition,
1243 oh->clkdm->pwrdm.ptr->prcm_offs,
1244 oh->prcm.omap4.rstctrl_offs);
1245 else
1246 return -EINVAL;
1247}
1248
1249/**
1250 * _deassert_hardreset - deassert the HW reset line of submodules contained
1251 * in the hwmod module.
1252 * @oh: struct omap_hwmod *
1253 * @name: name of the reset line to look up and deassert
1254 *
1255 * Some IP like dsp, ipu or iva contain processor that require
1256 * an HW reset line to be assert / deassert in order to enable fully
1257 * the IP.
1258 */
1259static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1260{
1261 struct omap_hwmod_rst_info ohri;
1262 int ret;
1263
1264 if (!oh)
1265 return -EINVAL;
1266
1267 ret = _lookup_hardreset(oh, name, &ohri);
1268 if (IS_ERR_VALUE(ret))
1269 return ret;
1270
1271 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1272 ret = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
1273 ohri.rst_shift,
1274 ohri.st_shift);
1275 } else if (cpu_is_omap44xx()) {
1276 if (ohri.st_shift)
1277 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1278 oh->name, name);
1279 ret = omap4_prminst_deassert_hardreset(ohri.rst_shift,
1280 oh->clkdm->pwrdm.ptr->prcm_partition,
1281 oh->clkdm->pwrdm.ptr->prcm_offs,
1282 oh->prcm.omap4.rstctrl_offs);
1283 } else {
1284 return -EINVAL;
1285 }
1286
1287 if (ret == -EBUSY)
1288 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1289
1290 return ret;
1291}
1292
1293/**
1294 * _read_hardreset - read the HW reset line state of submodules
1295 * contained in the hwmod module
1296 * @oh: struct omap_hwmod *
1297 * @name: name of the reset line to look up and read
1298 *
1299 * Return the state of the reset line.
1300 */
1301static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1302{
1303 struct omap_hwmod_rst_info ohri;
1304 u8 ret;
1305
1306 if (!oh)
1307 return -EINVAL;
1308
1309 ret = _lookup_hardreset(oh, name, &ohri);
1310 if (IS_ERR_VALUE(ret))
1311 return ret;
1312
1313 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1314 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
1315 ohri.st_shift);
1316 } else if (cpu_is_omap44xx()) {
1317 return omap4_prminst_is_hardreset_asserted(ohri.rst_shift,
1318 oh->clkdm->pwrdm.ptr->prcm_partition,
1319 oh->clkdm->pwrdm.ptr->prcm_offs,
1320 oh->prcm.omap4.rstctrl_offs);
1321 } else {
1322 return -EINVAL;
1323 }
1324}
1325
1326/**
1327 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1328 * @oh: struct omap_hwmod *
1329 *
1330 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1331 * enabled for this to work. Returns -EINVAL if the hwmod cannot be
1332 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1333 * the module did not reset in time, or 0 upon success.
1334 *
1335 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1336 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1337 * use the SYSCONFIG softreset bit to provide the status.
1338 *
1339 * Note that some IP like McBSP do have reset control but don't have
1340 * reset status.
1341 */
1342static int _ocp_softreset(struct omap_hwmod *oh)
1343{
1344 u32 v;
1345 int c = 0;
1346 int ret = 0;
1347
1348 if (!oh->class->sysc ||
1349 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1350 return -EINVAL;
1351
1352 /* clocks must be on for this operation */
1353 if (oh->_state != _HWMOD_STATE_ENABLED) {
1354 pr_warning("omap_hwmod: %s: reset can only be entered from "
1355 "enabled state\n", oh->name);
1356 return -EINVAL;
1357 }
1358
1359 /* For some modules, all optionnal clocks need to be enabled as well */
1360 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1361 _enable_optional_clocks(oh);
1362
1363 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1364
1365 v = oh->_sysc_cache;
1366 ret = _set_softreset(oh, &v);
1367 if (ret)
1368 goto dis_opt_clks;
1369 _write_sysconfig(v, oh);
1370
1371 if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
1372 omap_test_timeout((omap_hwmod_read(oh,
1373 oh->class->sysc->syss_offs)
1374 & SYSS_RESETDONE_MASK),
1375 MAX_MODULE_SOFTRESET_WAIT, c);
1376 else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS)
1377 omap_test_timeout(!(omap_hwmod_read(oh,
1378 oh->class->sysc->sysc_offs)
1379 & SYSC_TYPE2_SOFTRESET_MASK),
1380 MAX_MODULE_SOFTRESET_WAIT, c);
1381
1382 if (c == MAX_MODULE_SOFTRESET_WAIT)
1383 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1384 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1385 else
1386 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1387
1388 /*
1389 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1390 * _wait_target_ready() or _reset()
1391 */
1392
1393 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1394
1395dis_opt_clks:
1396 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1397 _disable_optional_clocks(oh);
1398
1399 return ret;
1400}
1401
1402/**
1403 * _reset - reset an omap_hwmod
1404 * @oh: struct omap_hwmod *
1405 *
1406 * Resets an omap_hwmod @oh. The default software reset mechanism for
1407 * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
1408 * bit. However, some hwmods cannot be reset via this method: some
1409 * are not targets and therefore have no OCP header registers to
1410 * access; others (like the IVA) have idiosyncratic reset sequences.
1411 * So for these relatively rare cases, custom reset code can be
1412 * supplied in the struct omap_hwmod_class .reset function pointer.
1413 * Passes along the return value from either _reset() or the custom
1414 * reset function - these must return -EINVAL if the hwmod cannot be
1415 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1416 * the module did not reset in time, or 0 upon success.
1417 */
1418static int _reset(struct omap_hwmod *oh)
1419{
1420 int ret;
1421
1422 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1423
1424 ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
1425
1426 return ret;
1427}
1428
1429/**
1430 * _enable - enable an omap_hwmod
1431 * @oh: struct omap_hwmod *
1432 *
1433 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1434 * register target. Returns -EINVAL if the hwmod is in the wrong
1435 * state or passes along the return value of _wait_target_ready().
1436 */
1437static int _enable(struct omap_hwmod *oh)
1438{
1439 int r;
1440 int hwsup = 0;
1441
1442 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1443
1444 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1445 oh->_state != _HWMOD_STATE_IDLE &&
1446 oh->_state != _HWMOD_STATE_DISABLED) {
1447 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
1448 "from initialized, idle, or disabled state\n", oh->name);
1449 return -EINVAL;
1450 }
1451
1452
1453 /*
1454 * If an IP contains only one HW reset line, then de-assert it in order
1455 * to allow the module state transition. Otherwise the PRCM will return
1456 * Intransition status, and the init will failed.
1457 */
1458 if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
1459 oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
1460 _deassert_hardreset(oh, oh->rst_lines[0].name);
1461
1462 /* Mux pins for device runtime if populated */
1463 if (oh->mux && (!oh->mux->enabled ||
1464 ((oh->_state == _HWMOD_STATE_IDLE) &&
1465 oh->mux->pads_dynamic)))
1466 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
1467
1468 _add_initiator_dep(oh, mpu_oh);
1469
1470 if (oh->clkdm) {
1471 /*
1472 * A clockdomain must be in SW_SUP before enabling
1473 * completely the module. The clockdomain can be set
1474 * in HW_AUTO only when the module become ready.
1475 */
1476 hwsup = clkdm_in_hwsup(oh->clkdm);
1477 r = clkdm_hwmod_enable(oh->clkdm, oh);
1478 if (r) {
1479 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1480 oh->name, oh->clkdm->name, r);
1481 return r;
1482 }
1483 }
1484
1485 _enable_clocks(oh);
1486 _enable_module(oh);
1487
1488 r = _wait_target_ready(oh);
1489 if (!r) {
1490 /*
1491 * Set the clockdomain to HW_AUTO only if the target is ready,
1492 * assuming that the previous state was HW_AUTO
1493 */
1494 if (oh->clkdm && hwsup)
1495 clkdm_allow_idle(oh->clkdm);
1496
1497 oh->_state = _HWMOD_STATE_ENABLED;
1498
1499 /* Access the sysconfig only if the target is ready */
1500 if (oh->class->sysc) {
1501 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1502 _update_sysc_cache(oh);
1503 _enable_sysc(oh);
1504 }
1505 } else {
1506 _disable_clocks(oh);
1507 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1508 oh->name, r);
1509
1510 if (oh->clkdm)
1511 clkdm_hwmod_disable(oh->clkdm, oh);
1512 }
1513
1514 return r;
1515}
1516
1517/**
1518 * _idle - idle an omap_hwmod
1519 * @oh: struct omap_hwmod *
1520 *
1521 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1522 * no further work. Returns -EINVAL if the hwmod is in the wrong
1523 * state or returns 0.
1524 */
1525static int _idle(struct omap_hwmod *oh)
1526{
1527 int ret;
1528
1529 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1530
1531 if (oh->_state != _HWMOD_STATE_ENABLED) {
1532 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
1533 "enabled state\n", oh->name);
1534 return -EINVAL;
1535 }
1536
1537 if (oh->class->sysc)
1538 _idle_sysc(oh);
1539 _del_initiator_dep(oh, mpu_oh);
1540 _disable_module(oh);
1541 ret = _wait_target_disable(oh);
1542 if (ret)
1543 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1544 oh->name);
1545 /*
1546 * The module must be in idle mode before disabling any parents
1547 * clocks. Otherwise, the parent clock might be disabled before
1548 * the module transition is done, and thus will prevent the
1549 * transition to complete properly.
1550 */
1551 _disable_clocks(oh);
1552 if (oh->clkdm)
1553 clkdm_hwmod_disable(oh->clkdm, oh);
1554
1555 /* Mux pins for device idle if populated */
1556 if (oh->mux && oh->mux->pads_dynamic)
1557 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
1558
1559 oh->_state = _HWMOD_STATE_IDLE;
1560
1561 return 0;
1562}
1563
1564/**
1565 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1566 * @oh: struct omap_hwmod *
1567 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1568 *
1569 * Sets the IP block's OCP autoidle bit in hardware, and updates our
1570 * local copy. Intended to be used by drivers that require
1571 * direct manipulation of the AUTOIDLE bits.
1572 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1573 * along the return value from _set_module_autoidle().
1574 *
1575 * Any users of this function should be scrutinized carefully.
1576 */
1577int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
1578{
1579 u32 v;
1580 int retval = 0;
1581 unsigned long flags;
1582
1583 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
1584 return -EINVAL;
1585
1586 spin_lock_irqsave(&oh->_lock, flags);
1587
1588 v = oh->_sysc_cache;
1589
1590 retval = _set_module_autoidle(oh, autoidle, &v);
1591
1592 if (!retval)
1593 _write_sysconfig(v, oh);
1594
1595 spin_unlock_irqrestore(&oh->_lock, flags);
1596
1597 return retval;
1598}
1599
1600/**
1601 * _shutdown - shutdown an omap_hwmod
1602 * @oh: struct omap_hwmod *
1603 *
1604 * Shut down an omap_hwmod @oh. This should be called when the driver
1605 * used for the hwmod is removed or unloaded or if the driver is not
1606 * used by the system. Returns -EINVAL if the hwmod is in the wrong
1607 * state or returns 0.
1608 */
1609static int _shutdown(struct omap_hwmod *oh)
1610{
1611 int ret;
1612 u8 prev_state;
1613
1614 if (oh->_state != _HWMOD_STATE_IDLE &&
1615 oh->_state != _HWMOD_STATE_ENABLED) {
1616 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
1617 "from idle, or enabled state\n", oh->name);
1618 return -EINVAL;
1619 }
1620
1621 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
1622
1623 if (oh->class->pre_shutdown) {
1624 prev_state = oh->_state;
1625 if (oh->_state == _HWMOD_STATE_IDLE)
1626 _enable(oh);
1627 ret = oh->class->pre_shutdown(oh);
1628 if (ret) {
1629 if (prev_state == _HWMOD_STATE_IDLE)
1630 _idle(oh);
1631 return ret;
1632 }
1633 }
1634
1635 if (oh->class->sysc) {
1636 if (oh->_state == _HWMOD_STATE_IDLE)
1637 _enable(oh);
1638 _shutdown_sysc(oh);
1639 }
1640
1641 /* clocks and deps are already disabled in idle */
1642 if (oh->_state == _HWMOD_STATE_ENABLED) {
1643 _del_initiator_dep(oh, mpu_oh);
1644 /* XXX what about the other system initiators here? dma, dsp */
1645 _disable_module(oh);
1646 ret = _wait_target_disable(oh);
1647 if (ret)
1648 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1649 oh->name);
1650 _disable_clocks(oh);
1651 if (oh->clkdm)
1652 clkdm_hwmod_disable(oh->clkdm, oh);
1653 }
1654 /* XXX Should this code also force-disable the optional clocks? */
1655
1656 /*
1657 * If an IP contains only one HW reset line, then assert it
1658 * after disabling the clocks and before shutting down the IP.
1659 */
1660 if (oh->rst_lines_cnt == 1)
1661 _assert_hardreset(oh, oh->rst_lines[0].name);
1662
1663 /* Mux pins to safe mode or use populated off mode values */
1664 if (oh->mux)
1665 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
1666
1667 oh->_state = _HWMOD_STATE_DISABLED;
1668
1669 return 0;
1670}
1671
1672/**
1673 * _setup - do initial configuration of omap_hwmod
1674 * @oh: struct omap_hwmod *
1675 *
1676 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
1677 * OCP_SYSCONFIG register. Returns 0.
1678 */
1679static int _setup(struct omap_hwmod *oh, void *data)
1680{
1681 int i, r;
1682 u8 postsetup_state;
1683
1684 if (oh->_state != _HWMOD_STATE_CLKS_INITED)
1685 return 0;
1686
1687 /* Set iclk autoidle mode */
1688 if (oh->slaves_cnt > 0) {
1689 for (i = 0; i < oh->slaves_cnt; i++) {
1690 struct omap_hwmod_ocp_if *os = oh->slaves[i];
1691 struct clk *c = os->_clk;
1692
1693 if (!c)
1694 continue;
1695
1696 if (os->flags & OCPIF_SWSUP_IDLE) {
1697 /* XXX omap_iclk_deny_idle(c); */
1698 } else {
1699 /* XXX omap_iclk_allow_idle(c); */
1700 clk_enable(c);
1701 }
1702 }
1703 }
1704
1705 oh->_state = _HWMOD_STATE_INITIALIZED;
1706
1707 /*
1708 * In the case of hwmod with hardreset that should not be
1709 * de-assert at boot time, we have to keep the module
1710 * initialized, because we cannot enable it properly with the
1711 * reset asserted. Exit without warning because that behavior is
1712 * expected.
1713 */
1714 if ((oh->flags & HWMOD_INIT_NO_RESET) && oh->rst_lines_cnt == 1)
1715 return 0;
1716
1717 r = _enable(oh);
1718 if (r) {
1719 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1720 oh->name, oh->_state);
1721 return 0;
1722 }
1723
1724 if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
1725 _reset(oh);
1726
1727 /*
1728 * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
1729 * The _enable() function should be split to
1730 * avoid the rewrite of the OCP_SYSCONFIG register.
1731 */
1732 if (oh->class->sysc) {
1733 _update_sysc_cache(oh);
1734 _enable_sysc(oh);
1735 }
1736 }
1737
1738 postsetup_state = oh->_postsetup_state;
1739 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
1740 postsetup_state = _HWMOD_STATE_ENABLED;
1741
1742 /*
1743 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
1744 * it should be set by the core code as a runtime flag during startup
1745 */
1746 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
1747 (postsetup_state == _HWMOD_STATE_IDLE))
1748 postsetup_state = _HWMOD_STATE_ENABLED;
1749
1750 if (postsetup_state == _HWMOD_STATE_IDLE)
1751 _idle(oh);
1752 else if (postsetup_state == _HWMOD_STATE_DISABLED)
1753 _shutdown(oh);
1754 else if (postsetup_state != _HWMOD_STATE_ENABLED)
1755 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
1756 oh->name, postsetup_state);
1757
1758 return 0;
1759}
1760
1761/**
1762 * _register - register a struct omap_hwmod
1763 * @oh: struct omap_hwmod *
1764 *
1765 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1766 * already has been registered by the same name; -EINVAL if the
1767 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1768 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1769 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1770 * success.
1771 *
1772 * XXX The data should be copied into bootmem, so the original data
1773 * should be marked __initdata and freed after init. This would allow
1774 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1775 * that the copy process would be relatively complex due to the large number
1776 * of substructures.
1777 */
1778static int __init _register(struct omap_hwmod *oh)
1779{
1780 int ms_id;
1781
1782 if (!oh || !oh->name || !oh->class || !oh->class->name ||
1783 (oh->_state != _HWMOD_STATE_UNKNOWN))
1784 return -EINVAL;
1785
1786 pr_debug("omap_hwmod: %s: registering\n", oh->name);
1787
1788 if (_lookup(oh->name))
1789 return -EEXIST;
1790
1791 ms_id = _find_mpu_port_index(oh);
1792 if (!IS_ERR_VALUE(ms_id))
1793 oh->_mpu_port_index = ms_id;
1794 else
1795 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1796
1797 list_add_tail(&oh->node, &omap_hwmod_list);
1798
1799 spin_lock_init(&oh->_lock);
1800
1801 oh->_state = _HWMOD_STATE_REGISTERED;
1802
1803 /*
1804 * XXX Rather than doing a strcmp(), this should test a flag
1805 * set in the hwmod data, inserted by the autogenerator code.
1806 */
1807 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
1808 mpu_oh = oh;
1809
1810 return 0;
1811}
1812
1813
1814/* Public functions */
1815
1816u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
1817{
1818 if (oh->flags & HWMOD_16BIT_REG)
1819 return __raw_readw(oh->_mpu_rt_va + reg_offs);
1820 else
1821 return __raw_readl(oh->_mpu_rt_va + reg_offs);
1822}
1823
1824void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
1825{
1826 if (oh->flags & HWMOD_16BIT_REG)
1827 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
1828 else
1829 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
1830}
1831
1832/**
1833 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
1834 * @oh: struct omap_hwmod *
1835 *
1836 * This is a public function exposed to drivers. Some drivers may need to do
1837 * some settings before and after resetting the device. Those drivers after
1838 * doing the necessary settings could use this function to start a reset by
1839 * setting the SYSCONFIG.SOFTRESET bit.
1840 */
1841int omap_hwmod_softreset(struct omap_hwmod *oh)
1842{
1843 u32 v;
1844 int ret;
1845
1846 if (!oh || !(oh->_sysc_cache))
1847 return -EINVAL;
1848
1849 v = oh->_sysc_cache;
1850 ret = _set_softreset(oh, &v);
1851 if (ret)
1852 goto error;
1853 _write_sysconfig(v, oh);
1854
1855error:
1856 return ret;
1857}
1858
1859/**
1860 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
1861 * @oh: struct omap_hwmod *
1862 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
1863 *
1864 * Sets the IP block's OCP slave idlemode in hardware, and updates our
1865 * local copy. Intended to be used by drivers that have some erratum
1866 * that requires direct manipulation of the SIDLEMODE bits. Returns
1867 * -EINVAL if @oh is null, or passes along the return value from
1868 * _set_slave_idlemode().
1869 *
1870 * XXX Does this function have any current users? If not, we should
1871 * remove it; it is better to let the rest of the hwmod code handle this.
1872 * Any users of this function should be scrutinized carefully.
1873 */
1874int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
1875{
1876 u32 v;
1877 int retval = 0;
1878
1879 if (!oh)
1880 return -EINVAL;
1881
1882 v = oh->_sysc_cache;
1883
1884 retval = _set_slave_idlemode(oh, idlemode, &v);
1885 if (!retval)
1886 _write_sysconfig(v, oh);
1887
1888 return retval;
1889}
1890
1891/**
1892 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1893 * @name: name of the omap_hwmod to look up
1894 *
1895 * Given a @name of an omap_hwmod, return a pointer to the registered
1896 * struct omap_hwmod *, or NULL upon error.
1897 */
1898struct omap_hwmod *omap_hwmod_lookup(const char *name)
1899{
1900 struct omap_hwmod *oh;
1901
1902 if (!name)
1903 return NULL;
1904
1905 oh = _lookup(name);
1906
1907 return oh;
1908}
1909
1910/**
1911 * omap_hwmod_for_each - call function for each registered omap_hwmod
1912 * @fn: pointer to a callback function
1913 * @data: void * data to pass to callback function
1914 *
1915 * Call @fn for each registered omap_hwmod, passing @data to each
1916 * function. @fn must return 0 for success or any other value for
1917 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1918 * will stop and the non-zero return value will be passed to the
1919 * caller of omap_hwmod_for_each(). @fn is called with
1920 * omap_hwmod_for_each() held.
1921 */
1922int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
1923 void *data)
1924{
1925 struct omap_hwmod *temp_oh;
1926 int ret = 0;
1927
1928 if (!fn)
1929 return -EINVAL;
1930
1931 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1932 ret = (*fn)(temp_oh, data);
1933 if (ret)
1934 break;
1935 }
1936
1937 return ret;
1938}
1939
1940/**
1941 * omap_hwmod_register - register an array of hwmods
1942 * @ohs: pointer to an array of omap_hwmods to register
1943 *
1944 * Intended to be called early in boot before the clock framework is
1945 * initialized. If @ohs is not null, will register all omap_hwmods
1946 * listed in @ohs that are valid for this chip. Returns 0.
1947 */
1948int __init omap_hwmod_register(struct omap_hwmod **ohs)
1949{
1950 int r, i;
1951
1952 if (!ohs)
1953 return 0;
1954
1955 i = 0;
1956 do {
1957 if (!omap_chip_is(ohs[i]->omap_chip))
1958 continue;
1959
1960 r = _register(ohs[i]);
1961 WARN(r, "omap_hwmod: %s: _register returned %d\n", ohs[i]->name,
1962 r);
1963 } while (ohs[++i]);
1964
1965 return 0;
1966}
1967
1968/*
1969 * _populate_mpu_rt_base - populate the virtual address for a hwmod
1970 *
1971 * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
1972 * Assumes the caller takes care of locking if needed.
1973 */
1974static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
1975{
1976 if (oh->_state != _HWMOD_STATE_REGISTERED)
1977 return 0;
1978
1979 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1980 return 0;
1981
1982 oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
1983
1984 return 0;
1985}
1986
1987/**
1988 * omap_hwmod_setup_one - set up a single hwmod
1989 * @oh_name: const char * name of the already-registered hwmod to set up
1990 *
1991 * Must be called after omap2_clk_init(). Resolves the struct clk
1992 * names to struct clk pointers for each registered omap_hwmod. Also
1993 * calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
1994 * success.
1995 */
1996int __init omap_hwmod_setup_one(const char *oh_name)
1997{
1998 struct omap_hwmod *oh;
1999 int r;
2000
2001 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
2002
2003 if (!mpu_oh) {
2004 pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
2005 oh_name, MPU_INITIATOR_NAME);
2006 return -EINVAL;
2007 }
2008
2009 oh = _lookup(oh_name);
2010 if (!oh) {
2011 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
2012 return -EINVAL;
2013 }
2014
2015 if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
2016 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
2017
2018 r = _populate_mpu_rt_base(oh, NULL);
2019 if (IS_ERR_VALUE(r)) {
2020 WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
2021 return -EINVAL;
2022 }
2023
2024 r = _init_clocks(oh, NULL);
2025 if (IS_ERR_VALUE(r)) {
2026 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
2027 return -EINVAL;
2028 }
2029
2030 _setup(oh, NULL);
2031
2032 return 0;
2033}
2034
2035/**
2036 * omap_hwmod_setup - do some post-clock framework initialization
2037 *
2038 * Must be called after omap2_clk_init(). Resolves the struct clk names
2039 * to struct clk pointers for each registered omap_hwmod. Also calls
2040 * _setup() on each hwmod. Returns 0 upon success.
2041 */
2042static int __init omap_hwmod_setup_all(void)
2043{
2044 int r;
2045
2046 if (!mpu_oh) {
2047 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
2048 __func__, MPU_INITIATOR_NAME);
2049 return -EINVAL;
2050 }
2051
2052 r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
2053
2054 r = omap_hwmod_for_each(_init_clocks, NULL);
2055 WARN(IS_ERR_VALUE(r),
2056 "omap_hwmod: %s: _init_clocks failed\n", __func__);
2057
2058 omap_hwmod_for_each(_setup, NULL);
2059
2060 return 0;
2061}
2062core_initcall(omap_hwmod_setup_all);
2063
2064/**
2065 * omap_hwmod_enable - enable an omap_hwmod
2066 * @oh: struct omap_hwmod *
2067 *
2068 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
2069 * Returns -EINVAL on error or passes along the return value from _enable().
2070 */
2071int omap_hwmod_enable(struct omap_hwmod *oh)
2072{
2073 int r;
2074 unsigned long flags;
2075
2076 if (!oh)
2077 return -EINVAL;
2078
2079 spin_lock_irqsave(&oh->_lock, flags);
2080 r = _enable(oh);
2081 spin_unlock_irqrestore(&oh->_lock, flags);
2082
2083 return r;
2084}
2085
2086/**
2087 * omap_hwmod_idle - idle an omap_hwmod
2088 * @oh: struct omap_hwmod *
2089 *
2090 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
2091 * Returns -EINVAL on error or passes along the return value from _idle().
2092 */
2093int omap_hwmod_idle(struct omap_hwmod *oh)
2094{
2095 unsigned long flags;
2096
2097 if (!oh)
2098 return -EINVAL;
2099
2100 spin_lock_irqsave(&oh->_lock, flags);
2101 _idle(oh);
2102 spin_unlock_irqrestore(&oh->_lock, flags);
2103
2104 return 0;
2105}
2106
2107/**
2108 * omap_hwmod_shutdown - shutdown an omap_hwmod
2109 * @oh: struct omap_hwmod *
2110 *
2111 * Shutdown an omap_hwmod @oh. Intended to be called by
2112 * omap_device_shutdown(). Returns -EINVAL on error or passes along
2113 * the return value from _shutdown().
2114 */
2115int omap_hwmod_shutdown(struct omap_hwmod *oh)
2116{
2117 unsigned long flags;
2118
2119 if (!oh)
2120 return -EINVAL;
2121
2122 spin_lock_irqsave(&oh->_lock, flags);
2123 _shutdown(oh);
2124 spin_unlock_irqrestore(&oh->_lock, flags);
2125
2126 return 0;
2127}
2128
2129/**
2130 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
2131 * @oh: struct omap_hwmod *oh
2132 *
2133 * Intended to be called by the omap_device code.
2134 */
2135int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
2136{
2137 unsigned long flags;
2138
2139 spin_lock_irqsave(&oh->_lock, flags);
2140 _enable_clocks(oh);
2141 spin_unlock_irqrestore(&oh->_lock, flags);
2142
2143 return 0;
2144}
2145
2146/**
2147 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
2148 * @oh: struct omap_hwmod *oh
2149 *
2150 * Intended to be called by the omap_device code.
2151 */
2152int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
2153{
2154 unsigned long flags;
2155
2156 spin_lock_irqsave(&oh->_lock, flags);
2157 _disable_clocks(oh);
2158 spin_unlock_irqrestore(&oh->_lock, flags);
2159
2160 return 0;
2161}
2162
2163/**
2164 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
2165 * @oh: struct omap_hwmod *oh
2166 *
2167 * Intended to be called by drivers and core code when all posted
2168 * writes to a device must complete before continuing further
2169 * execution (for example, after clearing some device IRQSTATUS
2170 * register bits)
2171 *
2172 * XXX what about targets with multiple OCP threads?
2173 */
2174void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
2175{
2176 BUG_ON(!oh);
2177
2178 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
2179 WARN(1, "omap_device: %s: OCP barrier impossible due to "
2180 "device configuration\n", oh->name);
2181 return;
2182 }
2183
2184 /*
2185 * Forces posted writes to complete on the OCP thread handling
2186 * register writes
2187 */
2188 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
2189}
2190
2191/**
2192 * omap_hwmod_reset - reset the hwmod
2193 * @oh: struct omap_hwmod *
2194 *
2195 * Under some conditions, a driver may wish to reset the entire device.
2196 * Called from omap_device code. Returns -EINVAL on error or passes along
2197 * the return value from _reset().
2198 */
2199int omap_hwmod_reset(struct omap_hwmod *oh)
2200{
2201 int r;
2202 unsigned long flags;
2203
2204 if (!oh)
2205 return -EINVAL;
2206
2207 spin_lock_irqsave(&oh->_lock, flags);
2208 r = _reset(oh);
2209 spin_unlock_irqrestore(&oh->_lock, flags);
2210
2211 return r;
2212}
2213
2214/**
2215 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
2216 * @oh: struct omap_hwmod *
2217 * @res: pointer to the first element of an array of struct resource to fill
2218 *
2219 * Count the number of struct resource array elements necessary to
2220 * contain omap_hwmod @oh resources. Intended to be called by code
2221 * that registers omap_devices. Intended to be used to determine the
2222 * size of a dynamically-allocated struct resource array, before
2223 * calling omap_hwmod_fill_resources(). Returns the number of struct
2224 * resource array elements needed.
2225 *
2226 * XXX This code is not optimized. It could attempt to merge adjacent
2227 * resource IDs.
2228 *
2229 */
2230int omap_hwmod_count_resources(struct omap_hwmod *oh)
2231{
2232 int ret, i;
2233
2234 ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
2235
2236 for (i = 0; i < oh->slaves_cnt; i++)
2237 ret += _count_ocp_if_addr_spaces(oh->slaves[i]);
2238
2239 return ret;
2240}
2241
2242/**
2243 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
2244 * @oh: struct omap_hwmod *
2245 * @res: pointer to the first element of an array of struct resource to fill
2246 *
2247 * Fill the struct resource array @res with resource data from the
2248 * omap_hwmod @oh. Intended to be called by code that registers
2249 * omap_devices. See also omap_hwmod_count_resources(). Returns the
2250 * number of array elements filled.
2251 */
2252int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
2253{
2254 int i, j, mpu_irqs_cnt, sdma_reqs_cnt;
2255 int r = 0;
2256
2257 /* For each IRQ, DMA, memory area, fill in array.*/
2258
2259 mpu_irqs_cnt = _count_mpu_irqs(oh);
2260 for (i = 0; i < mpu_irqs_cnt; i++) {
2261 (res + r)->name = (oh->mpu_irqs + i)->name;
2262 (res + r)->start = (oh->mpu_irqs + i)->irq;
2263 (res + r)->end = (oh->mpu_irqs + i)->irq;
2264 (res + r)->flags = IORESOURCE_IRQ;
2265 r++;
2266 }
2267
2268 sdma_reqs_cnt = _count_sdma_reqs(oh);
2269 for (i = 0; i < sdma_reqs_cnt; i++) {
2270 (res + r)->name = (oh->sdma_reqs + i)->name;
2271 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
2272 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
2273 (res + r)->flags = IORESOURCE_DMA;
2274 r++;
2275 }
2276
2277 for (i = 0; i < oh->slaves_cnt; i++) {
2278 struct omap_hwmod_ocp_if *os;
2279 int addr_cnt;
2280
2281 os = oh->slaves[i];
2282 addr_cnt = _count_ocp_if_addr_spaces(os);
2283
2284 for (j = 0; j < addr_cnt; j++) {
2285 (res + r)->name = (os->addr + j)->name;
2286 (res + r)->start = (os->addr + j)->pa_start;
2287 (res + r)->end = (os->addr + j)->pa_end;
2288 (res + r)->flags = IORESOURCE_MEM;
2289 r++;
2290 }
2291 }
2292
2293 return r;
2294}
2295
2296/**
2297 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2298 * @oh: struct omap_hwmod *
2299 *
2300 * Return the powerdomain pointer associated with the OMAP module
2301 * @oh's main clock. If @oh does not have a main clk, return the
2302 * powerdomain associated with the interface clock associated with the
2303 * module's MPU port. (XXX Perhaps this should use the SDMA port
2304 * instead?) Returns NULL on error, or a struct powerdomain * on
2305 * success.
2306 */
2307struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
2308{
2309 struct clk *c;
2310
2311 if (!oh)
2312 return NULL;
2313
2314 if (oh->_clk) {
2315 c = oh->_clk;
2316 } else {
2317 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2318 return NULL;
2319 c = oh->slaves[oh->_mpu_port_index]->_clk;
2320 }
2321
2322 if (!c->clkdm)
2323 return NULL;
2324
2325 return c->clkdm->pwrdm.ptr;
2326
2327}
2328
2329/**
2330 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
2331 * @oh: struct omap_hwmod *
2332 *
2333 * Returns the virtual address corresponding to the beginning of the
2334 * module's register target, in the address range that is intended to
2335 * be used by the MPU. Returns the virtual address upon success or NULL
2336 * upon error.
2337 */
2338void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
2339{
2340 if (!oh)
2341 return NULL;
2342
2343 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2344 return NULL;
2345
2346 if (oh->_state == _HWMOD_STATE_UNKNOWN)
2347 return NULL;
2348
2349 return oh->_mpu_rt_va;
2350}
2351
2352/**
2353 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
2354 * @oh: struct omap_hwmod *
2355 * @init_oh: struct omap_hwmod * (initiator)
2356 *
2357 * Add a sleep dependency between the initiator @init_oh and @oh.
2358 * Intended to be called by DSP/Bridge code via platform_data for the
2359 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2360 * code needs to add/del initiator dependencies dynamically
2361 * before/after accessing a device. Returns the return value from
2362 * _add_initiator_dep().
2363 *
2364 * XXX Keep a usecount in the clockdomain code
2365 */
2366int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
2367 struct omap_hwmod *init_oh)
2368{
2369 return _add_initiator_dep(oh, init_oh);
2370}
2371
2372/*
2373 * XXX what about functions for drivers to save/restore ocp_sysconfig
2374 * for context save/restore operations?
2375 */
2376
2377/**
2378 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
2379 * @oh: struct omap_hwmod *
2380 * @init_oh: struct omap_hwmod * (initiator)
2381 *
2382 * Remove a sleep dependency between the initiator @init_oh and @oh.
2383 * Intended to be called by DSP/Bridge code via platform_data for the
2384 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2385 * code needs to add/del initiator dependencies dynamically
2386 * before/after accessing a device. Returns the return value from
2387 * _del_initiator_dep().
2388 *
2389 * XXX Keep a usecount in the clockdomain code
2390 */
2391int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
2392 struct omap_hwmod *init_oh)
2393{
2394 return _del_initiator_dep(oh, init_oh);
2395}
2396
2397/**
2398 * omap_hwmod_enable_wakeup - allow device to wake up the system
2399 * @oh: struct omap_hwmod *
2400 *
2401 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
2402 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
2403 * registers to cause the PRCM to receive wakeup events from the
2404 * module. Does not set any wakeup routing registers beyond this
2405 * point - if the module is to wake up any other module or subsystem,
2406 * that must be set separately. Called by omap_device code. Returns
2407 * -EINVAL on error or 0 upon success.
2408 */
2409int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
2410{
2411 unsigned long flags;
2412 u32 v;
2413
2414 if (!oh->class->sysc ||
2415 !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2416 return -EINVAL;
2417
2418 spin_lock_irqsave(&oh->_lock, flags);
2419 v = oh->_sysc_cache;
2420 _enable_wakeup(oh, &v);
2421 _write_sysconfig(v, oh);
2422 spin_unlock_irqrestore(&oh->_lock, flags);
2423
2424 return 0;
2425}
2426
2427/**
2428 * omap_hwmod_disable_wakeup - prevent device from waking the system
2429 * @oh: struct omap_hwmod *
2430 *
2431 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
2432 * from sending wakeups to the PRCM. Eventually this should clear
2433 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
2434 * from the module. Does not set any wakeup routing registers beyond
2435 * this point - if the module is to wake up any other module or
2436 * subsystem, that must be set separately. Called by omap_device
2437 * code. Returns -EINVAL on error or 0 upon success.
2438 */
2439int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
2440{
2441 unsigned long flags;
2442 u32 v;
2443
2444 if (!oh->class->sysc ||
2445 !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2446 return -EINVAL;
2447
2448 spin_lock_irqsave(&oh->_lock, flags);
2449 v = oh->_sysc_cache;
2450 _disable_wakeup(oh, &v);
2451 _write_sysconfig(v, oh);
2452 spin_unlock_irqrestore(&oh->_lock, flags);
2453
2454 return 0;
2455}
2456
2457/**
2458 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
2459 * contained in the hwmod module.
2460 * @oh: struct omap_hwmod *
2461 * @name: name of the reset line to lookup and assert
2462 *
2463 * Some IP like dsp, ipu or iva contain processor that require
2464 * an HW reset line to be assert / deassert in order to enable fully
2465 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2466 * yet supported on this OMAP; otherwise, passes along the return value
2467 * from _assert_hardreset().
2468 */
2469int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
2470{
2471 int ret;
2472 unsigned long flags;
2473
2474 if (!oh)
2475 return -EINVAL;
2476
2477 spin_lock_irqsave(&oh->_lock, flags);
2478 ret = _assert_hardreset(oh, name);
2479 spin_unlock_irqrestore(&oh->_lock, flags);
2480
2481 return ret;
2482}
2483
2484/**
2485 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
2486 * contained in the hwmod module.
2487 * @oh: struct omap_hwmod *
2488 * @name: name of the reset line to look up and deassert
2489 *
2490 * Some IP like dsp, ipu or iva contain processor that require
2491 * an HW reset line to be assert / deassert in order to enable fully
2492 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2493 * yet supported on this OMAP; otherwise, passes along the return value
2494 * from _deassert_hardreset().
2495 */
2496int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
2497{
2498 int ret;
2499 unsigned long flags;
2500
2501 if (!oh)
2502 return -EINVAL;
2503
2504 spin_lock_irqsave(&oh->_lock, flags);
2505 ret = _deassert_hardreset(oh, name);
2506 spin_unlock_irqrestore(&oh->_lock, flags);
2507
2508 return ret;
2509}
2510
2511/**
2512 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
2513 * contained in the hwmod module
2514 * @oh: struct omap_hwmod *
2515 * @name: name of the reset line to look up and read
2516 *
2517 * Return the current state of the hwmod @oh's reset line named @name:
2518 * returns -EINVAL upon parameter error or if this operation
2519 * is unsupported on the current OMAP; otherwise, passes along the return
2520 * value from _read_hardreset().
2521 */
2522int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
2523{
2524 int ret;
2525 unsigned long flags;
2526
2527 if (!oh)
2528 return -EINVAL;
2529
2530 spin_lock_irqsave(&oh->_lock, flags);
2531 ret = _read_hardreset(oh, name);
2532 spin_unlock_irqrestore(&oh->_lock, flags);
2533
2534 return ret;
2535}
2536
2537
2538/**
2539 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
2540 * @classname: struct omap_hwmod_class name to search for
2541 * @fn: callback function pointer to call for each hwmod in class @classname
2542 * @user: arbitrary context data to pass to the callback function
2543 *
2544 * For each omap_hwmod of class @classname, call @fn.
2545 * If the callback function returns something other than
2546 * zero, the iterator is terminated, and the callback function's return
2547 * value is passed back to the caller. Returns 0 upon success, -EINVAL
2548 * if @classname or @fn are NULL, or passes back the error code from @fn.
2549 */
2550int omap_hwmod_for_each_by_class(const char *classname,
2551 int (*fn)(struct omap_hwmod *oh,
2552 void *user),
2553 void *user)
2554{
2555 struct omap_hwmod *temp_oh;
2556 int ret = 0;
2557
2558 if (!classname || !fn)
2559 return -EINVAL;
2560
2561 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
2562 __func__, classname);
2563
2564 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
2565 if (!strcmp(temp_oh->class->name, classname)) {
2566 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
2567 __func__, temp_oh->name);
2568 ret = (*fn)(temp_oh, user);
2569 if (ret)
2570 break;
2571 }
2572 }
2573
2574 if (ret)
2575 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
2576 __func__, ret);
2577
2578 return ret;
2579}
2580
2581/**
2582 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
2583 * @oh: struct omap_hwmod *
2584 * @state: state that _setup() should leave the hwmod in
2585 *
2586 * Sets the hwmod state that @oh will enter at the end of _setup()
2587 * (called by omap_hwmod_setup_*()). Only valid to call between
2588 * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
2589 * 0 upon success or -EINVAL if there is a problem with the arguments
2590 * or if the hwmod is in the wrong state.
2591 */
2592int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
2593{
2594 int ret;
2595 unsigned long flags;
2596
2597 if (!oh)
2598 return -EINVAL;
2599
2600 if (state != _HWMOD_STATE_DISABLED &&
2601 state != _HWMOD_STATE_ENABLED &&
2602 state != _HWMOD_STATE_IDLE)
2603 return -EINVAL;
2604
2605 spin_lock_irqsave(&oh->_lock, flags);
2606
2607 if (oh->_state != _HWMOD_STATE_REGISTERED) {
2608 ret = -EINVAL;
2609 goto ohsps_unlock;
2610 }
2611
2612 oh->_postsetup_state = state;
2613 ret = 0;
2614
2615ohsps_unlock:
2616 spin_unlock_irqrestore(&oh->_lock, flags);
2617
2618 return ret;
2619}
2620
2621/**
2622 * omap_hwmod_get_context_loss_count - get lost context count
2623 * @oh: struct omap_hwmod *
2624 *
2625 * Query the powerdomain of of @oh to get the context loss
2626 * count for this device.
2627 *
2628 * Returns the context loss count of the powerdomain assocated with @oh
2629 * upon success, or zero if no powerdomain exists for @oh.
2630 */
2631u32 omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
2632{
2633 struct powerdomain *pwrdm;
2634 int ret = 0;
2635
2636 pwrdm = omap_hwmod_get_pwrdm(oh);
2637 if (pwrdm)
2638 ret = pwrdm_get_context_loss_count(pwrdm);
2639
2640 return ret;
2641}
2642
2643/**
2644 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
2645 * @oh: struct omap_hwmod *
2646 *
2647 * Prevent the hwmod @oh from being reset during the setup process.
2648 * Intended for use by board-*.c files on boards with devices that
2649 * cannot tolerate being reset. Must be called before the hwmod has
2650 * been set up. Returns 0 upon success or negative error code upon
2651 * failure.
2652 */
2653int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
2654{
2655 if (!oh)
2656 return -EINVAL;
2657
2658 if (oh->_state != _HWMOD_STATE_REGISTERED) {
2659 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
2660 oh->name);
2661 return -EINVAL;
2662 }
2663
2664 oh->flags |= HWMOD_INIT_NO_RESET;
2665
2666 return 0;
2667}
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->clkdm) {
631 return oh->clkdm;
632 } else if (oh->_clk) {
633 if (!omap2_clk_is_hw_omap(__clk_get_hw(oh->_clk)))
634 return NULL;
635 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
636 return clk->clkdm;
637 }
638 return NULL;
639}
640
641/**
642 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
643 * @oh: struct omap_hwmod *
644 *
645 * Prevent the hardware module @oh from entering idle while the
646 * hardare module initiator @init_oh is active. Useful when a module
647 * will be accessed by a particular initiator (e.g., if a module will
648 * be accessed by the IVA, there should be a sleepdep between the IVA
649 * initiator and the module). Only applies to modules in smart-idle
650 * mode. If the clockdomain is marked as not needing autodeps, return
651 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
652 * passes along clkdm_add_sleepdep() value upon success.
653 */
654static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
655{
656 struct clockdomain *clkdm, *init_clkdm;
657
658 clkdm = _get_clkdm(oh);
659 init_clkdm = _get_clkdm(init_oh);
660
661 if (!clkdm || !init_clkdm)
662 return -EINVAL;
663
664 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
665 return 0;
666
667 return clkdm_add_sleepdep(clkdm, init_clkdm);
668}
669
670/**
671 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
672 * @oh: struct omap_hwmod *
673 *
674 * Allow the hardware module @oh to enter idle while the hardare
675 * module initiator @init_oh is active. Useful when a module will not
676 * be accessed by a particular initiator (e.g., if a module will not
677 * be accessed by the IVA, there should be no sleepdep between the IVA
678 * initiator and the module). Only applies to modules in smart-idle
679 * mode. If the clockdomain is marked as not needing autodeps, return
680 * 0 without doing anything. Returns -EINVAL upon error or passes
681 * along clkdm_del_sleepdep() value upon success.
682 */
683static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
684{
685 struct clockdomain *clkdm, *init_clkdm;
686
687 clkdm = _get_clkdm(oh);
688 init_clkdm = _get_clkdm(init_oh);
689
690 if (!clkdm || !init_clkdm)
691 return -EINVAL;
692
693 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
694 return 0;
695
696 return clkdm_del_sleepdep(clkdm, init_clkdm);
697}
698
699static const struct of_device_id ti_clkctrl_match_table[] __initconst = {
700 { .compatible = "ti,clkctrl" },
701 { }
702};
703
704static int __init _setup_clkctrl_provider(struct device_node *np)
705{
706 const __be32 *addrp;
707 struct clkctrl_provider *provider;
708 u64 size;
709 int i;
710
711 provider = memblock_alloc(sizeof(*provider), SMP_CACHE_BYTES);
712 if (!provider)
713 return -ENOMEM;
714
715 provider->node = np;
716
717 provider->num_addrs =
718 of_property_count_elems_of_size(np, "reg", sizeof(u32)) / 2;
719
720 provider->addr =
721 memblock_alloc(sizeof(void *) * provider->num_addrs,
722 SMP_CACHE_BYTES);
723 if (!provider->addr)
724 return -ENOMEM;
725
726 provider->size =
727 memblock_alloc(sizeof(u32) * provider->num_addrs,
728 SMP_CACHE_BYTES);
729 if (!provider->size)
730 return -ENOMEM;
731
732 for (i = 0; i < provider->num_addrs; i++) {
733 addrp = of_get_address(np, i, &size, NULL);
734 provider->addr[i] = (u32)of_translate_address(np, addrp);
735 provider->size[i] = size;
736 pr_debug("%s: %pOF: %x...%x\n", __func__, np, provider->addr[i],
737 provider->addr[i] + provider->size[i]);
738 }
739
740 list_add(&provider->link, &clkctrl_providers);
741
742 return 0;
743}
744
745static int __init _init_clkctrl_providers(void)
746{
747 struct device_node *np;
748 int ret = 0;
749
750 for_each_matching_node(np, ti_clkctrl_match_table) {
751 ret = _setup_clkctrl_provider(np);
752 if (ret)
753 break;
754 }
755
756 return ret;
757}
758
759static u32 _omap4_xlate_clkctrl(struct omap_hwmod *oh)
760{
761 if (!oh->prcm.omap4.modulemode)
762 return 0;
763
764 return omap_cm_xlate_clkctrl(oh->clkdm->prcm_partition,
765 oh->clkdm->cm_inst,
766 oh->prcm.omap4.clkctrl_offs);
767}
768
769static struct clk *_lookup_clkctrl_clk(struct omap_hwmod *oh)
770{
771 struct clkctrl_provider *provider;
772 struct clk *clk;
773 u32 addr;
774
775 if (!soc_ops.xlate_clkctrl)
776 return NULL;
777
778 addr = soc_ops.xlate_clkctrl(oh);
779 if (!addr)
780 return NULL;
781
782 pr_debug("%s: %s: addr=%x\n", __func__, oh->name, addr);
783
784 list_for_each_entry(provider, &clkctrl_providers, link) {
785 int i;
786
787 for (i = 0; i < provider->num_addrs; i++) {
788 if (provider->addr[i] <= addr &&
789 provider->addr[i] + provider->size[i] > addr) {
790 struct of_phandle_args clkspec;
791
792 clkspec.np = provider->node;
793 clkspec.args_count = 2;
794 clkspec.args[0] = addr - provider->addr[0];
795 clkspec.args[1] = 0;
796
797 clk = of_clk_get_from_provider(&clkspec);
798
799 pr_debug("%s: %s got %p (offset=%x, provider=%pOF)\n",
800 __func__, oh->name, clk,
801 clkspec.args[0], provider->node);
802
803 return clk;
804 }
805 }
806 }
807
808 return NULL;
809}
810
811/**
812 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
813 * @oh: struct omap_hwmod *
814 *
815 * Called from _init_clocks(). Populates the @oh _clk (main
816 * functional clock pointer) if a clock matching the hwmod name is found,
817 * or a main_clk is present. Returns 0 on success or -EINVAL on error.
818 */
819static int _init_main_clk(struct omap_hwmod *oh)
820{
821 int ret = 0;
822 struct clk *clk = NULL;
823
824 clk = _lookup_clkctrl_clk(oh);
825
826 if (!IS_ERR_OR_NULL(clk)) {
827 pr_debug("%s: mapped main_clk %s for %s\n", __func__,
828 __clk_get_name(clk), oh->name);
829 oh->main_clk = __clk_get_name(clk);
830 oh->_clk = clk;
831 soc_ops.disable_direct_prcm(oh);
832 } else {
833 if (!oh->main_clk)
834 return 0;
835
836 oh->_clk = clk_get(NULL, oh->main_clk);
837 }
838
839 if (IS_ERR(oh->_clk)) {
840 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
841 oh->name, oh->main_clk);
842 return -EINVAL;
843 }
844 /*
845 * HACK: This needs a re-visit once clk_prepare() is implemented
846 * to do something meaningful. Today its just a no-op.
847 * If clk_prepare() is used at some point to do things like
848 * voltage scaling etc, then this would have to be moved to
849 * some point where subsystems like i2c and pmic become
850 * available.
851 */
852 clk_prepare(oh->_clk);
853
854 if (!_get_clkdm(oh))
855 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
856 oh->name, oh->main_clk);
857
858 return ret;
859}
860
861/**
862 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
863 * @oh: struct omap_hwmod *
864 *
865 * Called from _init_clocks(). Populates the @oh OCP slave interface
866 * clock pointers. Returns 0 on success or -EINVAL on error.
867 */
868static int _init_interface_clks(struct omap_hwmod *oh)
869{
870 struct omap_hwmod_ocp_if *os;
871 struct clk *c;
872 int ret = 0;
873
874 list_for_each_entry(os, &oh->slave_ports, node) {
875 if (!os->clk)
876 continue;
877
878 c = clk_get(NULL, os->clk);
879 if (IS_ERR(c)) {
880 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
881 oh->name, os->clk);
882 ret = -EINVAL;
883 continue;
884 }
885 os->_clk = c;
886 /*
887 * HACK: This needs a re-visit once clk_prepare() is implemented
888 * to do something meaningful. Today its just a no-op.
889 * If clk_prepare() is used at some point to do things like
890 * voltage scaling etc, then this would have to be moved to
891 * some point where subsystems like i2c and pmic become
892 * available.
893 */
894 clk_prepare(os->_clk);
895 }
896
897 return ret;
898}
899
900/**
901 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
902 * @oh: struct omap_hwmod *
903 *
904 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
905 * clock pointers. Returns 0 on success or -EINVAL on error.
906 */
907static int _init_opt_clks(struct omap_hwmod *oh)
908{
909 struct omap_hwmod_opt_clk *oc;
910 struct clk *c;
911 int i;
912 int ret = 0;
913
914 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
915 c = clk_get(NULL, oc->clk);
916 if (IS_ERR(c)) {
917 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
918 oh->name, oc->clk);
919 ret = -EINVAL;
920 continue;
921 }
922 oc->_clk = c;
923 /*
924 * HACK: This needs a re-visit once clk_prepare() is implemented
925 * to do something meaningful. Today its just a no-op.
926 * If clk_prepare() is used at some point to do things like
927 * voltage scaling etc, then this would have to be moved to
928 * some point where subsystems like i2c and pmic become
929 * available.
930 */
931 clk_prepare(oc->_clk);
932 }
933
934 return ret;
935}
936
937static void _enable_optional_clocks(struct omap_hwmod *oh)
938{
939 struct omap_hwmod_opt_clk *oc;
940 int i;
941
942 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
943
944 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
945 if (oc->_clk) {
946 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
947 __clk_get_name(oc->_clk));
948 clk_enable(oc->_clk);
949 }
950}
951
952static void _disable_optional_clocks(struct omap_hwmod *oh)
953{
954 struct omap_hwmod_opt_clk *oc;
955 int i;
956
957 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
958
959 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
960 if (oc->_clk) {
961 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
962 __clk_get_name(oc->_clk));
963 clk_disable(oc->_clk);
964 }
965}
966
967/**
968 * _enable_clocks - enable hwmod main clock and interface clocks
969 * @oh: struct omap_hwmod *
970 *
971 * Enables all clocks necessary for register reads and writes to succeed
972 * on the hwmod @oh. Returns 0.
973 */
974static int _enable_clocks(struct omap_hwmod *oh)
975{
976 struct omap_hwmod_ocp_if *os;
977
978 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
979
980 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
981 _enable_optional_clocks(oh);
982
983 if (oh->_clk)
984 clk_enable(oh->_clk);
985
986 list_for_each_entry(os, &oh->slave_ports, node) {
987 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
988 omap2_clk_deny_idle(os->_clk);
989 clk_enable(os->_clk);
990 }
991 }
992
993 /* The opt clocks are controlled by the device driver. */
994
995 return 0;
996}
997
998/**
999 * _omap4_clkctrl_managed_by_clkfwk - true if clkctrl managed by clock framework
1000 * @oh: struct omap_hwmod *
1001 */
1002static bool _omap4_clkctrl_managed_by_clkfwk(struct omap_hwmod *oh)
1003{
1004 if (oh->prcm.omap4.flags & HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK)
1005 return true;
1006
1007 return false;
1008}
1009
1010/**
1011 * _omap4_has_clkctrl_clock - returns true if a module has clkctrl clock
1012 * @oh: struct omap_hwmod *
1013 */
1014static bool _omap4_has_clkctrl_clock(struct omap_hwmod *oh)
1015{
1016 if (oh->prcm.omap4.clkctrl_offs)
1017 return true;
1018
1019 if (!oh->prcm.omap4.clkctrl_offs &&
1020 oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET)
1021 return true;
1022
1023 return false;
1024}
1025
1026/**
1027 * _disable_clocks - disable hwmod main clock and interface clocks
1028 * @oh: struct omap_hwmod *
1029 *
1030 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
1031 */
1032static int _disable_clocks(struct omap_hwmod *oh)
1033{
1034 struct omap_hwmod_ocp_if *os;
1035
1036 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
1037
1038 if (oh->_clk)
1039 clk_disable(oh->_clk);
1040
1041 list_for_each_entry(os, &oh->slave_ports, node) {
1042 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE)) {
1043 clk_disable(os->_clk);
1044 omap2_clk_allow_idle(os->_clk);
1045 }
1046 }
1047
1048 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
1049 _disable_optional_clocks(oh);
1050
1051 /* The opt clocks are controlled by the device driver. */
1052
1053 return 0;
1054}
1055
1056/**
1057 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
1058 * @oh: struct omap_hwmod *
1059 *
1060 * Enables the PRCM module mode related to the hwmod @oh.
1061 * No return value.
1062 */
1063static void _omap4_enable_module(struct omap_hwmod *oh)
1064{
1065 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1066 _omap4_clkctrl_managed_by_clkfwk(oh))
1067 return;
1068
1069 pr_debug("omap_hwmod: %s: %s: %d\n",
1070 oh->name, __func__, oh->prcm.omap4.modulemode);
1071
1072 omap_cm_module_enable(oh->prcm.omap4.modulemode,
1073 oh->clkdm->prcm_partition,
1074 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
1075}
1076
1077/**
1078 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
1079 * @oh: struct omap_hwmod *
1080 *
1081 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1082 * does not have an IDLEST bit or if the module successfully enters
1083 * slave idle; otherwise, pass along the return value of the
1084 * appropriate *_cm*_wait_module_idle() function.
1085 */
1086static int _omap4_wait_target_disable(struct omap_hwmod *oh)
1087{
1088 if (!oh)
1089 return -EINVAL;
1090
1091 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1092 return 0;
1093
1094 if (oh->flags & HWMOD_NO_IDLEST)
1095 return 0;
1096
1097 if (_omap4_clkctrl_managed_by_clkfwk(oh))
1098 return 0;
1099
1100 if (!_omap4_has_clkctrl_clock(oh))
1101 return 0;
1102
1103 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1104 oh->clkdm->cm_inst,
1105 oh->prcm.omap4.clkctrl_offs, 0);
1106}
1107
1108/**
1109 * _save_mpu_port_index - find and save the index to @oh's MPU port
1110 * @oh: struct omap_hwmod *
1111 *
1112 * Determines the array index of the OCP slave port that the MPU uses
1113 * to address the device, and saves it into the struct omap_hwmod.
1114 * Intended to be called during hwmod registration only. No return
1115 * value.
1116 */
1117static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1118{
1119 struct omap_hwmod_ocp_if *os = NULL;
1120
1121 if (!oh)
1122 return;
1123
1124 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1125
1126 list_for_each_entry(os, &oh->slave_ports, node) {
1127 if (os->user & OCP_USER_MPU) {
1128 oh->_mpu_port = os;
1129 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1130 break;
1131 }
1132 }
1133
1134 return;
1135}
1136
1137/**
1138 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1139 * @oh: struct omap_hwmod *
1140 *
1141 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1142 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1143 * communicate with the IP block. This interface need not be directly
1144 * connected to the MPU (and almost certainly is not), but is directly
1145 * connected to the IP block represented by @oh. Returns a pointer
1146 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1147 * error or if there does not appear to be a path from the MPU to this
1148 * IP block.
1149 */
1150static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1151{
1152 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1153 return NULL;
1154
1155 return oh->_mpu_port;
1156};
1157
1158/**
1159 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1160 * @oh: struct omap_hwmod *
1161 *
1162 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1163 * by @oh is set to indicate to the PRCM that the IP block is active.
1164 * Usually this means placing the module into smart-idle mode and
1165 * smart-standby, but if there is a bug in the automatic idle handling
1166 * for the IP block, it may need to be placed into the force-idle or
1167 * no-idle variants of these modes. No return value.
1168 */
1169static void _enable_sysc(struct omap_hwmod *oh)
1170{
1171 u8 idlemode, sf;
1172 u32 v;
1173 bool clkdm_act;
1174 struct clockdomain *clkdm;
1175
1176 if (!oh->class->sysc)
1177 return;
1178
1179 /*
1180 * Wait until reset has completed, this is needed as the IP
1181 * block is reset automatically by hardware in some cases
1182 * (off-mode for example), and the drivers require the
1183 * IP to be ready when they access it
1184 */
1185 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1186 _enable_optional_clocks(oh);
1187 _wait_softreset_complete(oh);
1188 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1189 _disable_optional_clocks(oh);
1190
1191 v = oh->_sysc_cache;
1192 sf = oh->class->sysc->sysc_flags;
1193
1194 clkdm = _get_clkdm(oh);
1195 if (sf & SYSC_HAS_SIDLEMODE) {
1196 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1197 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1198 idlemode = HWMOD_IDLEMODE_NO;
1199 } else {
1200 if (sf & SYSC_HAS_ENAWAKEUP)
1201 _enable_wakeup(oh, &v);
1202 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1203 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1204 else
1205 idlemode = HWMOD_IDLEMODE_SMART;
1206 }
1207
1208 /*
1209 * This is special handling for some IPs like
1210 * 32k sync timer. Force them to idle!
1211 */
1212 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1213 if (clkdm_act && !(oh->class->sysc->idlemodes &
1214 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1215 idlemode = HWMOD_IDLEMODE_FORCE;
1216
1217 _set_slave_idlemode(oh, idlemode, &v);
1218 }
1219
1220 if (sf & SYSC_HAS_MIDLEMODE) {
1221 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1222 idlemode = HWMOD_IDLEMODE_FORCE;
1223 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1224 idlemode = HWMOD_IDLEMODE_NO;
1225 } else {
1226 if (sf & SYSC_HAS_ENAWAKEUP)
1227 _enable_wakeup(oh, &v);
1228 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1229 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1230 else
1231 idlemode = HWMOD_IDLEMODE_SMART;
1232 }
1233 _set_master_standbymode(oh, idlemode, &v);
1234 }
1235
1236 /*
1237 * XXX The clock framework should handle this, by
1238 * calling into this code. But this must wait until the
1239 * clock structures are tagged with omap_hwmod entries
1240 */
1241 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1242 (sf & SYSC_HAS_CLOCKACTIVITY))
1243 _set_clockactivity(oh, CLOCKACT_TEST_ICLK, &v);
1244
1245 _write_sysconfig(v, oh);
1246
1247 /*
1248 * Set the autoidle bit only after setting the smartidle bit
1249 * Setting this will not have any impact on the other modules.
1250 */
1251 if (sf & SYSC_HAS_AUTOIDLE) {
1252 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1253 0 : 1;
1254 _set_module_autoidle(oh, idlemode, &v);
1255 _write_sysconfig(v, oh);
1256 }
1257}
1258
1259/**
1260 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1261 * @oh: struct omap_hwmod *
1262 *
1263 * If module is marked as SWSUP_SIDLE, force the module into slave
1264 * idle; otherwise, configure it for smart-idle. If module is marked
1265 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1266 * configure it for smart-standby. No return value.
1267 */
1268static void _idle_sysc(struct omap_hwmod *oh)
1269{
1270 u8 idlemode, sf;
1271 u32 v;
1272
1273 if (!oh->class->sysc)
1274 return;
1275
1276 v = oh->_sysc_cache;
1277 sf = oh->class->sysc->sysc_flags;
1278
1279 if (sf & SYSC_HAS_SIDLEMODE) {
1280 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1281 idlemode = HWMOD_IDLEMODE_FORCE;
1282 } else {
1283 if (sf & SYSC_HAS_ENAWAKEUP)
1284 _enable_wakeup(oh, &v);
1285 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1286 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1287 else
1288 idlemode = HWMOD_IDLEMODE_SMART;
1289 }
1290 _set_slave_idlemode(oh, idlemode, &v);
1291 }
1292
1293 if (sf & SYSC_HAS_MIDLEMODE) {
1294 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1295 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1296 idlemode = HWMOD_IDLEMODE_FORCE;
1297 } else {
1298 if (sf & SYSC_HAS_ENAWAKEUP)
1299 _enable_wakeup(oh, &v);
1300 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1301 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1302 else
1303 idlemode = HWMOD_IDLEMODE_SMART;
1304 }
1305 _set_master_standbymode(oh, idlemode, &v);
1306 }
1307
1308 /* If the cached value is the same as the new value, skip the write */
1309 if (oh->_sysc_cache != v)
1310 _write_sysconfig(v, oh);
1311}
1312
1313/**
1314 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1315 * @oh: struct omap_hwmod *
1316 *
1317 * Force the module into slave idle and master suspend. No return
1318 * value.
1319 */
1320static void _shutdown_sysc(struct omap_hwmod *oh)
1321{
1322 u32 v;
1323 u8 sf;
1324
1325 if (!oh->class->sysc)
1326 return;
1327
1328 v = oh->_sysc_cache;
1329 sf = oh->class->sysc->sysc_flags;
1330
1331 if (sf & SYSC_HAS_SIDLEMODE)
1332 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1333
1334 if (sf & SYSC_HAS_MIDLEMODE)
1335 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1336
1337 if (sf & SYSC_HAS_AUTOIDLE)
1338 _set_module_autoidle(oh, 1, &v);
1339
1340 _write_sysconfig(v, oh);
1341}
1342
1343/**
1344 * _lookup - find an omap_hwmod by name
1345 * @name: find an omap_hwmod by name
1346 *
1347 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1348 */
1349static struct omap_hwmod *_lookup(const char *name)
1350{
1351 struct omap_hwmod *oh, *temp_oh;
1352
1353 oh = NULL;
1354
1355 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1356 if (!strcmp(name, temp_oh->name)) {
1357 oh = temp_oh;
1358 break;
1359 }
1360 }
1361
1362 return oh;
1363}
1364
1365/**
1366 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1367 * @oh: struct omap_hwmod *
1368 *
1369 * Convert a clockdomain name stored in a struct omap_hwmod into a
1370 * clockdomain pointer, and save it into the struct omap_hwmod.
1371 * Return -EINVAL if the clkdm_name lookup failed.
1372 */
1373static int _init_clkdm(struct omap_hwmod *oh)
1374{
1375 if (!oh->clkdm_name) {
1376 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1377 return 0;
1378 }
1379
1380 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1381 if (!oh->clkdm) {
1382 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1383 oh->name, oh->clkdm_name);
1384 return 0;
1385 }
1386
1387 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1388 oh->name, oh->clkdm_name);
1389
1390 return 0;
1391}
1392
1393/**
1394 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1395 * well the clockdomain.
1396 * @oh: struct omap_hwmod *
1397 * @np: device_node mapped to this hwmod
1398 *
1399 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1400 * Resolves all clock names embedded in the hwmod. Returns 0 on
1401 * success, or a negative error code on failure.
1402 */
1403static int _init_clocks(struct omap_hwmod *oh, struct device_node *np)
1404{
1405 int ret = 0;
1406
1407 if (oh->_state != _HWMOD_STATE_REGISTERED)
1408 return 0;
1409
1410 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1411
1412 if (soc_ops.init_clkdm)
1413 ret |= soc_ops.init_clkdm(oh);
1414
1415 ret |= _init_main_clk(oh);
1416 ret |= _init_interface_clks(oh);
1417 ret |= _init_opt_clks(oh);
1418
1419 if (!ret)
1420 oh->_state = _HWMOD_STATE_CLKS_INITED;
1421 else
1422 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1423
1424 return ret;
1425}
1426
1427/**
1428 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1429 * @oh: struct omap_hwmod *
1430 * @name: name of the reset line in the context of this hwmod
1431 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1432 *
1433 * Return the bit position of the reset line that match the
1434 * input name. Return -ENOENT if not found.
1435 */
1436static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1437 struct omap_hwmod_rst_info *ohri)
1438{
1439 int i;
1440
1441 for (i = 0; i < oh->rst_lines_cnt; i++) {
1442 const char *rst_line = oh->rst_lines[i].name;
1443 if (!strcmp(rst_line, name)) {
1444 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1445 ohri->st_shift = oh->rst_lines[i].st_shift;
1446 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1447 oh->name, __func__, rst_line, ohri->rst_shift,
1448 ohri->st_shift);
1449
1450 return 0;
1451 }
1452 }
1453
1454 return -ENOENT;
1455}
1456
1457/**
1458 * _assert_hardreset - assert the HW reset line of submodules
1459 * contained in the hwmod module.
1460 * @oh: struct omap_hwmod *
1461 * @name: name of the reset line to lookup and assert
1462 *
1463 * Some IP like dsp, ipu or iva contain processor that require an HW
1464 * reset line to be assert / deassert in order to enable fully the IP.
1465 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1466 * asserting the hardreset line on the currently-booted SoC, or passes
1467 * along the return value from _lookup_hardreset() or the SoC's
1468 * assert_hardreset code.
1469 */
1470static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1471{
1472 struct omap_hwmod_rst_info ohri;
1473 int ret = -EINVAL;
1474
1475 if (!oh)
1476 return -EINVAL;
1477
1478 if (!soc_ops.assert_hardreset)
1479 return -ENOSYS;
1480
1481 ret = _lookup_hardreset(oh, name, &ohri);
1482 if (ret < 0)
1483 return ret;
1484
1485 ret = soc_ops.assert_hardreset(oh, &ohri);
1486
1487 return ret;
1488}
1489
1490/**
1491 * _deassert_hardreset - deassert the HW reset line of submodules contained
1492 * in the hwmod module.
1493 * @oh: struct omap_hwmod *
1494 * @name: name of the reset line to look up and deassert
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 * deasserting the hardreset line on the currently-booted SoC, or passes
1500 * along the return value from _lookup_hardreset() or the SoC's
1501 * deassert_hardreset code.
1502 */
1503static int _deassert_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.deassert_hardreset)
1512 return -ENOSYS;
1513
1514 ret = _lookup_hardreset(oh, name, &ohri);
1515 if (ret < 0)
1516 return ret;
1517
1518 if (oh->clkdm) {
1519 /*
1520 * A clockdomain must be in SW_SUP otherwise reset
1521 * might not be completed. The clockdomain can be set
1522 * in HW_AUTO only when the module become ready.
1523 */
1524 clkdm_deny_idle(oh->clkdm);
1525 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1526 if (ret) {
1527 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1528 oh->name, oh->clkdm->name, ret);
1529 return ret;
1530 }
1531 }
1532
1533 _enable_clocks(oh);
1534 if (soc_ops.enable_module)
1535 soc_ops.enable_module(oh);
1536
1537 ret = soc_ops.deassert_hardreset(oh, &ohri);
1538
1539 if (soc_ops.disable_module)
1540 soc_ops.disable_module(oh);
1541 _disable_clocks(oh);
1542
1543 if (ret == -EBUSY)
1544 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1545
1546 if (oh->clkdm) {
1547 /*
1548 * Set the clockdomain to HW_AUTO, assuming that the
1549 * previous state was HW_AUTO.
1550 */
1551 clkdm_allow_idle(oh->clkdm);
1552
1553 clkdm_hwmod_disable(oh->clkdm, oh);
1554 }
1555
1556 return ret;
1557}
1558
1559/**
1560 * _read_hardreset - read the HW reset line state of submodules
1561 * contained in the hwmod module
1562 * @oh: struct omap_hwmod *
1563 * @name: name of the reset line to look up and read
1564 *
1565 * Return the state of the reset line. Returns -EINVAL if @oh is
1566 * null, -ENOSYS if we have no way of reading the hardreset line
1567 * status on the currently-booted SoC, or passes along the return
1568 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1569 * code.
1570 */
1571static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1572{
1573 struct omap_hwmod_rst_info ohri;
1574 int ret = -EINVAL;
1575
1576 if (!oh)
1577 return -EINVAL;
1578
1579 if (!soc_ops.is_hardreset_asserted)
1580 return -ENOSYS;
1581
1582 ret = _lookup_hardreset(oh, name, &ohri);
1583 if (ret < 0)
1584 return ret;
1585
1586 return soc_ops.is_hardreset_asserted(oh, &ohri);
1587}
1588
1589/**
1590 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1591 * @oh: struct omap_hwmod *
1592 *
1593 * If all hardreset lines associated with @oh are asserted, then return true.
1594 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1595 * associated with @oh are asserted, then return false.
1596 * This function is used to avoid executing some parts of the IP block
1597 * enable/disable sequence if its hardreset line is set.
1598 */
1599static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1600{
1601 int i, rst_cnt = 0;
1602
1603 if (oh->rst_lines_cnt == 0)
1604 return false;
1605
1606 for (i = 0; i < oh->rst_lines_cnt; i++)
1607 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1608 rst_cnt++;
1609
1610 if (oh->rst_lines_cnt == rst_cnt)
1611 return true;
1612
1613 return false;
1614}
1615
1616/**
1617 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1618 * hard-reset
1619 * @oh: struct omap_hwmod *
1620 *
1621 * If any hardreset lines associated with @oh are asserted, then
1622 * return true. Otherwise, if no hardreset lines associated with @oh
1623 * are asserted, or if @oh has no hardreset lines, then return false.
1624 * This function is used to avoid executing some parts of the IP block
1625 * enable/disable sequence if any hardreset line is set.
1626 */
1627static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1628{
1629 int rst_cnt = 0;
1630 int i;
1631
1632 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1633 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1634 rst_cnt++;
1635
1636 return (rst_cnt) ? true : false;
1637}
1638
1639/**
1640 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1641 * @oh: struct omap_hwmod *
1642 *
1643 * Disable the PRCM module mode related to the hwmod @oh.
1644 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1645 */
1646static int _omap4_disable_module(struct omap_hwmod *oh)
1647{
1648 int v;
1649
1650 if (!oh->clkdm || !oh->prcm.omap4.modulemode ||
1651 _omap4_clkctrl_managed_by_clkfwk(oh))
1652 return -EINVAL;
1653
1654 /*
1655 * Since integration code might still be doing something, only
1656 * disable if all lines are under hardreset.
1657 */
1658 if (_are_any_hardreset_lines_asserted(oh))
1659 return 0;
1660
1661 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1662
1663 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1664 oh->prcm.omap4.clkctrl_offs);
1665
1666 v = _omap4_wait_target_disable(oh);
1667 if (v)
1668 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1669 oh->name);
1670
1671 return 0;
1672}
1673
1674/**
1675 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1676 * @oh: struct omap_hwmod *
1677 *
1678 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1679 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1680 * reset this way, -EINVAL if the hwmod is in the wrong state,
1681 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1682 *
1683 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1684 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1685 * use the SYSCONFIG softreset bit to provide the status.
1686 *
1687 * Note that some IP like McBSP do have reset control but don't have
1688 * reset status.
1689 */
1690static int _ocp_softreset(struct omap_hwmod *oh)
1691{
1692 u32 v;
1693 int c = 0;
1694 int ret = 0;
1695
1696 if (!oh->class->sysc ||
1697 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1698 return -ENOENT;
1699
1700 /* clocks must be on for this operation */
1701 if (oh->_state != _HWMOD_STATE_ENABLED) {
1702 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1703 oh->name);
1704 return -EINVAL;
1705 }
1706
1707 /* For some modules, all optionnal clocks need to be enabled as well */
1708 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1709 _enable_optional_clocks(oh);
1710
1711 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1712
1713 v = oh->_sysc_cache;
1714 ret = _set_softreset(oh, &v);
1715 if (ret)
1716 goto dis_opt_clks;
1717
1718 _write_sysconfig(v, oh);
1719
1720 if (oh->class->sysc->srst_udelay)
1721 udelay(oh->class->sysc->srst_udelay);
1722
1723 c = _wait_softreset_complete(oh);
1724 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1725 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1726 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1727 ret = -ETIMEDOUT;
1728 goto dis_opt_clks;
1729 } else {
1730 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1731 }
1732
1733 ret = _clear_softreset(oh, &v);
1734 if (ret)
1735 goto dis_opt_clks;
1736
1737 _write_sysconfig(v, oh);
1738
1739 /*
1740 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1741 * _wait_target_ready() or _reset()
1742 */
1743
1744dis_opt_clks:
1745 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1746 _disable_optional_clocks(oh);
1747
1748 return ret;
1749}
1750
1751/**
1752 * _reset - reset an omap_hwmod
1753 * @oh: struct omap_hwmod *
1754 *
1755 * Resets an omap_hwmod @oh. If the module has a custom reset
1756 * function pointer defined, then call it to reset the IP block, and
1757 * pass along its return value to the caller. Otherwise, if the IP
1758 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1759 * associated with it, call a function to reset the IP block via that
1760 * method, and pass along the return value to the caller. Finally, if
1761 * the IP block has some hardreset lines associated with it, assert
1762 * all of those, but do _not_ deassert them. (This is because driver
1763 * authors have expressed an apparent requirement to control the
1764 * deassertion of the hardreset lines themselves.)
1765 *
1766 * The default software reset mechanism for most OMAP IP blocks is
1767 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1768 * hwmods cannot be reset via this method. Some are not targets and
1769 * therefore have no OCP header registers to access. Others (like the
1770 * IVA) have idiosyncratic reset sequences. So for these relatively
1771 * rare cases, custom reset code can be supplied in the struct
1772 * omap_hwmod_class .reset function pointer.
1773 *
1774 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1775 * does not prevent idling of the system. This is necessary for cases
1776 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1777 * kernel without disabling dma.
1778 *
1779 * Passes along the return value from either _ocp_softreset() or the
1780 * custom reset function - these must return -EINVAL if the hwmod
1781 * cannot be reset this way or if the hwmod is in the wrong state,
1782 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1783 */
1784static int _reset(struct omap_hwmod *oh)
1785{
1786 int i, r;
1787
1788 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1789
1790 if (oh->class->reset) {
1791 r = oh->class->reset(oh);
1792 } else {
1793 if (oh->rst_lines_cnt > 0) {
1794 for (i = 0; i < oh->rst_lines_cnt; i++)
1795 _assert_hardreset(oh, oh->rst_lines[i].name);
1796 return 0;
1797 } else {
1798 r = _ocp_softreset(oh);
1799 if (r == -ENOENT)
1800 r = 0;
1801 }
1802 }
1803
1804 _set_dmadisable(oh);
1805
1806 /*
1807 * OCP_SYSCONFIG bits need to be reprogrammed after a
1808 * softreset. The _enable() function should be split to avoid
1809 * the rewrite of the OCP_SYSCONFIG register.
1810 */
1811 if (oh->class->sysc) {
1812 _update_sysc_cache(oh);
1813 _enable_sysc(oh);
1814 }
1815
1816 return r;
1817}
1818
1819/**
1820 * _omap4_update_context_lost - increment hwmod context loss counter if
1821 * hwmod context was lost, and clear hardware context loss reg
1822 * @oh: hwmod to check for context loss
1823 *
1824 * If the PRCM indicates that the hwmod @oh lost context, increment
1825 * our in-memory context loss counter, and clear the RM_*_CONTEXT
1826 * bits. No return value.
1827 */
1828static void _omap4_update_context_lost(struct omap_hwmod *oh)
1829{
1830 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
1831 return;
1832
1833 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1834 oh->clkdm->pwrdm.ptr->prcm_offs,
1835 oh->prcm.omap4.context_offs))
1836 return;
1837
1838 oh->prcm.omap4.context_lost_counter++;
1839 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1840 oh->clkdm->pwrdm.ptr->prcm_offs,
1841 oh->prcm.omap4.context_offs);
1842}
1843
1844/**
1845 * _omap4_get_context_lost - get context loss counter for a hwmod
1846 * @oh: hwmod to get context loss counter for
1847 *
1848 * Returns the in-memory context loss counter for a hwmod.
1849 */
1850static int _omap4_get_context_lost(struct omap_hwmod *oh)
1851{
1852 return oh->prcm.omap4.context_lost_counter;
1853}
1854
1855/**
1856 * _enable - enable an omap_hwmod
1857 * @oh: struct omap_hwmod *
1858 *
1859 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1860 * register target. Returns -EINVAL if the hwmod is in the wrong
1861 * state or passes along the return value of _wait_target_ready().
1862 */
1863static int _enable(struct omap_hwmod *oh)
1864{
1865 int r;
1866
1867 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1868
1869 /*
1870 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1871 * state at init.
1872 */
1873 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
1874 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
1875 return 0;
1876 }
1877
1878 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1879 oh->_state != _HWMOD_STATE_IDLE &&
1880 oh->_state != _HWMOD_STATE_DISABLED) {
1881 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
1882 oh->name);
1883 return -EINVAL;
1884 }
1885
1886 /*
1887 * If an IP block contains HW reset lines and all of them are
1888 * asserted, we let integration code associated with that
1889 * block handle the enable. We've received very little
1890 * information on what those driver authors need, and until
1891 * detailed information is provided and the driver code is
1892 * posted to the public lists, this is probably the best we
1893 * can do.
1894 */
1895 if (_are_all_hardreset_lines_asserted(oh))
1896 return 0;
1897
1898 _add_initiator_dep(oh, mpu_oh);
1899
1900 if (oh->clkdm) {
1901 /*
1902 * A clockdomain must be in SW_SUP before enabling
1903 * completely the module. The clockdomain can be set
1904 * in HW_AUTO only when the module become ready.
1905 */
1906 clkdm_deny_idle(oh->clkdm);
1907 r = clkdm_hwmod_enable(oh->clkdm, oh);
1908 if (r) {
1909 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1910 oh->name, oh->clkdm->name, r);
1911 return r;
1912 }
1913 }
1914
1915 _enable_clocks(oh);
1916 if (soc_ops.enable_module)
1917 soc_ops.enable_module(oh);
1918 if (oh->flags & HWMOD_BLOCK_WFI)
1919 cpu_idle_poll_ctrl(true);
1920
1921 if (soc_ops.update_context_lost)
1922 soc_ops.update_context_lost(oh);
1923
1924 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
1925 -EINVAL;
1926 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
1927 clkdm_allow_idle(oh->clkdm);
1928
1929 if (!r) {
1930 oh->_state = _HWMOD_STATE_ENABLED;
1931
1932 /* Access the sysconfig only if the target is ready */
1933 if (oh->class->sysc) {
1934 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1935 _update_sysc_cache(oh);
1936 _enable_sysc(oh);
1937 }
1938 } else {
1939 if (soc_ops.disable_module)
1940 soc_ops.disable_module(oh);
1941 _disable_clocks(oh);
1942 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
1943 oh->name, r);
1944
1945 if (oh->clkdm)
1946 clkdm_hwmod_disable(oh->clkdm, oh);
1947 }
1948
1949 return r;
1950}
1951
1952/**
1953 * _idle - idle an omap_hwmod
1954 * @oh: struct omap_hwmod *
1955 *
1956 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1957 * no further work. Returns -EINVAL if the hwmod is in the wrong
1958 * state or returns 0.
1959 */
1960static int _idle(struct omap_hwmod *oh)
1961{
1962 if (oh->flags & HWMOD_NO_IDLE) {
1963 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
1964 return 0;
1965 }
1966
1967 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1968
1969 if (_are_all_hardreset_lines_asserted(oh))
1970 return 0;
1971
1972 if (oh->_state != _HWMOD_STATE_ENABLED) {
1973 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
1974 oh->name);
1975 return -EINVAL;
1976 }
1977
1978 if (oh->class->sysc)
1979 _idle_sysc(oh);
1980 _del_initiator_dep(oh, mpu_oh);
1981
1982 /*
1983 * If HWMOD_CLKDM_NOAUTO is set then we don't
1984 * deny idle the clkdm again since idle was already denied
1985 * in _enable()
1986 */
1987 if (oh->clkdm && !(oh->flags & HWMOD_CLKDM_NOAUTO))
1988 clkdm_deny_idle(oh->clkdm);
1989
1990 if (oh->flags & HWMOD_BLOCK_WFI)
1991 cpu_idle_poll_ctrl(false);
1992 if (soc_ops.disable_module)
1993 soc_ops.disable_module(oh);
1994
1995 /*
1996 * The module must be in idle mode before disabling any parents
1997 * clocks. Otherwise, the parent clock might be disabled before
1998 * the module transition is done, and thus will prevent the
1999 * transition to complete properly.
2000 */
2001 _disable_clocks(oh);
2002 if (oh->clkdm) {
2003 clkdm_allow_idle(oh->clkdm);
2004 clkdm_hwmod_disable(oh->clkdm, oh);
2005 }
2006
2007 oh->_state = _HWMOD_STATE_IDLE;
2008
2009 return 0;
2010}
2011
2012/**
2013 * _shutdown - shutdown an omap_hwmod
2014 * @oh: struct omap_hwmod *
2015 *
2016 * Shut down an omap_hwmod @oh. This should be called when the driver
2017 * used for the hwmod is removed or unloaded or if the driver is not
2018 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2019 * state or returns 0.
2020 */
2021static int _shutdown(struct omap_hwmod *oh)
2022{
2023 int ret, i;
2024 u8 prev_state;
2025
2026 if (_are_all_hardreset_lines_asserted(oh))
2027 return 0;
2028
2029 if (oh->_state != _HWMOD_STATE_IDLE &&
2030 oh->_state != _HWMOD_STATE_ENABLED) {
2031 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2032 oh->name);
2033 return -EINVAL;
2034 }
2035
2036 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2037
2038 if (oh->class->pre_shutdown) {
2039 prev_state = oh->_state;
2040 if (oh->_state == _HWMOD_STATE_IDLE)
2041 _enable(oh);
2042 ret = oh->class->pre_shutdown(oh);
2043 if (ret) {
2044 if (prev_state == _HWMOD_STATE_IDLE)
2045 _idle(oh);
2046 return ret;
2047 }
2048 }
2049
2050 if (oh->class->sysc) {
2051 if (oh->_state == _HWMOD_STATE_IDLE)
2052 _enable(oh);
2053 _shutdown_sysc(oh);
2054 }
2055
2056 /* clocks and deps are already disabled in idle */
2057 if (oh->_state == _HWMOD_STATE_ENABLED) {
2058 _del_initiator_dep(oh, mpu_oh);
2059 /* XXX what about the other system initiators here? dma, dsp */
2060 if (oh->flags & HWMOD_BLOCK_WFI)
2061 cpu_idle_poll_ctrl(false);
2062 if (soc_ops.disable_module)
2063 soc_ops.disable_module(oh);
2064 _disable_clocks(oh);
2065 if (oh->clkdm)
2066 clkdm_hwmod_disable(oh->clkdm, oh);
2067 }
2068 /* XXX Should this code also force-disable the optional clocks? */
2069
2070 for (i = 0; i < oh->rst_lines_cnt; i++)
2071 _assert_hardreset(oh, oh->rst_lines[i].name);
2072
2073 oh->_state = _HWMOD_STATE_DISABLED;
2074
2075 return 0;
2076}
2077
2078static int of_dev_find_hwmod(struct device_node *np,
2079 struct omap_hwmod *oh)
2080{
2081 int count, i, res;
2082 const char *p;
2083
2084 count = of_property_count_strings(np, "ti,hwmods");
2085 if (count < 1)
2086 return -ENODEV;
2087
2088 for (i = 0; i < count; i++) {
2089 res = of_property_read_string_index(np, "ti,hwmods",
2090 i, &p);
2091 if (res)
2092 continue;
2093 if (!strcmp(p, oh->name)) {
2094 pr_debug("omap_hwmod: dt %pOFn[%i] uses hwmod %s\n",
2095 np, i, oh->name);
2096 return i;
2097 }
2098 }
2099
2100 return -ENODEV;
2101}
2102
2103/**
2104 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2105 * @np: struct device_node *
2106 * @oh: struct omap_hwmod *
2107 * @index: index of the entry found
2108 * @found: struct device_node * found or NULL
2109 *
2110 * Parse the dt blob and find out needed hwmod. Recursive function is
2111 * implemented to take care hierarchical dt blob parsing.
2112 * Return: Returns 0 on success, -ENODEV when not found.
2113 */
2114static int of_dev_hwmod_lookup(struct device_node *np,
2115 struct omap_hwmod *oh,
2116 int *index,
2117 struct device_node **found)
2118{
2119 struct device_node *np0 = NULL;
2120 int res;
2121
2122 res = of_dev_find_hwmod(np, oh);
2123 if (res >= 0) {
2124 *found = np;
2125 *index = res;
2126 return 0;
2127 }
2128
2129 for_each_child_of_node(np, np0) {
2130 struct device_node *fc;
2131 int i;
2132
2133 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2134 if (res == 0) {
2135 *found = fc;
2136 *index = i;
2137 return 0;
2138 }
2139 }
2140
2141 *found = NULL;
2142 *index = 0;
2143
2144 return -ENODEV;
2145}
2146
2147/**
2148 * omap_hwmod_fix_mpu_rt_idx - fix up mpu_rt_idx register offsets
2149 *
2150 * @oh: struct omap_hwmod *
2151 * @np: struct device_node *
2152 *
2153 * Fix up module register offsets for modules with mpu_rt_idx.
2154 * Only needed for cpsw with interconnect target module defined
2155 * in device tree while still using legacy hwmod platform data
2156 * for rev, sysc and syss registers.
2157 *
2158 * Can be removed when all cpsw hwmod platform data has been
2159 * dropped.
2160 */
2161static void omap_hwmod_fix_mpu_rt_idx(struct omap_hwmod *oh,
2162 struct device_node *np,
2163 struct resource *res)
2164{
2165 struct device_node *child = NULL;
2166 int error;
2167
2168 child = of_get_next_child(np, child);
2169 if (!child)
2170 return;
2171
2172 error = of_address_to_resource(child, oh->mpu_rt_idx, res);
2173 if (error)
2174 pr_err("%s: error mapping mpu_rt_idx: %i\n",
2175 __func__, error);
2176}
2177
2178/**
2179 * omap_hwmod_parse_module_range - map module IO range from device tree
2180 * @oh: struct omap_hwmod *
2181 * @np: struct device_node *
2182 *
2183 * Parse the device tree range an interconnect target module provides
2184 * for it's child device IP blocks. This way we can support the old
2185 * "ti,hwmods" property with just dts data without a need for platform
2186 * data for IO resources. And we don't need all the child IP device
2187 * nodes available in the dts.
2188 */
2189int omap_hwmod_parse_module_range(struct omap_hwmod *oh,
2190 struct device_node *np,
2191 struct resource *res)
2192{
2193 struct property *prop;
2194 const __be32 *ranges;
2195 const char *name;
2196 u32 nr_addr, nr_size;
2197 u64 base, size;
2198 int len, error;
2199
2200 if (!res)
2201 return -EINVAL;
2202
2203 ranges = of_get_property(np, "ranges", &len);
2204 if (!ranges)
2205 return -ENOENT;
2206
2207 len /= sizeof(*ranges);
2208
2209 if (len < 3)
2210 return -EINVAL;
2211
2212 of_property_for_each_string(np, "compatible", prop, name)
2213 if (!strncmp("ti,sysc-", name, 8))
2214 break;
2215
2216 if (!name)
2217 return -ENOENT;
2218
2219 error = of_property_read_u32(np, "#address-cells", &nr_addr);
2220 if (error)
2221 return -ENOENT;
2222
2223 error = of_property_read_u32(np, "#size-cells", &nr_size);
2224 if (error)
2225 return -ENOENT;
2226
2227 if (nr_addr != 1 || nr_size != 1) {
2228 pr_err("%s: invalid range for %s->%pOFn\n", __func__,
2229 oh->name, np);
2230 return -EINVAL;
2231 }
2232
2233 ranges++;
2234 base = of_translate_address(np, ranges++);
2235 size = be32_to_cpup(ranges);
2236
2237 pr_debug("omap_hwmod: %s %pOFn at 0x%llx size 0x%llx\n",
2238 oh->name, np, base, size);
2239
2240 if (oh && oh->mpu_rt_idx) {
2241 omap_hwmod_fix_mpu_rt_idx(oh, np, res);
2242
2243 return 0;
2244 }
2245
2246 res->start = base;
2247 res->end = base + size - 1;
2248 res->flags = IORESOURCE_MEM;
2249
2250 return 0;
2251}
2252
2253/**
2254 * _init_mpu_rt_base - populate the virtual address for a hwmod
2255 * @oh: struct omap_hwmod * to locate the virtual address
2256 * @data: (unused, caller should pass NULL)
2257 * @index: index of the reg entry iospace in device tree
2258 * @np: struct device_node * of the IP block's device node in the DT data
2259 *
2260 * Cache the virtual address used by the MPU to access this IP block's
2261 * registers. This address is needed early so the OCP registers that
2262 * are part of the device's address space can be ioremapped properly.
2263 *
2264 * If SYSC access is not needed, the registers will not be remapped
2265 * and non-availability of MPU access is not treated as an error.
2266 *
2267 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2268 * -ENXIO on absent or invalid register target address space.
2269 */
2270static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2271 int index, struct device_node *np)
2272{
2273 void __iomem *va_start = NULL;
2274 struct resource res;
2275 int error;
2276
2277 if (!oh)
2278 return -EINVAL;
2279
2280 _save_mpu_port_index(oh);
2281
2282 /* if we don't need sysc access we don't need to ioremap */
2283 if (!oh->class->sysc)
2284 return 0;
2285
2286 /* we can't continue without MPU PORT if we need sysc access */
2287 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2288 return -ENXIO;
2289
2290 if (!np) {
2291 pr_err("omap_hwmod: %s: no dt node\n", oh->name);
2292 return -ENXIO;
2293 }
2294
2295 /* Do we have a dts range for the interconnect target module? */
2296 error = omap_hwmod_parse_module_range(oh, np, &res);
2297 if (!error)
2298 va_start = ioremap(res.start, resource_size(&res));
2299
2300 /* No ranges, rely on device reg entry */
2301 if (!va_start)
2302 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2303 if (!va_start) {
2304 pr_err("omap_hwmod: %s: Missing dt reg%i for %pOF\n",
2305 oh->name, index, np);
2306 return -ENXIO;
2307 }
2308
2309 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2310 oh->name, va_start);
2311
2312 oh->_mpu_rt_va = va_start;
2313 return 0;
2314}
2315
2316static void __init parse_module_flags(struct omap_hwmod *oh,
2317 struct device_node *np)
2318{
2319 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2320 oh->flags |= HWMOD_INIT_NO_RESET;
2321 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2322 oh->flags |= HWMOD_INIT_NO_IDLE;
2323 if (of_find_property(np, "ti,no-idle", NULL))
2324 oh->flags |= HWMOD_NO_IDLE;
2325}
2326
2327/**
2328 * _init - initialize internal data for the hwmod @oh
2329 * @oh: struct omap_hwmod *
2330 * @n: (unused)
2331 *
2332 * Look up the clocks and the address space used by the MPU to access
2333 * registers belonging to the hwmod @oh. @oh must already be
2334 * registered at this point. This is the first of two phases for
2335 * hwmod initialization. Code called here does not touch any hardware
2336 * registers, it simply prepares internal data structures. Returns 0
2337 * upon success or if the hwmod isn't registered or if the hwmod's
2338 * address space is not defined, or -EINVAL upon failure.
2339 */
2340static int __init _init(struct omap_hwmod *oh, void *data)
2341{
2342 int r, index;
2343 struct device_node *np = NULL;
2344 struct device_node *bus;
2345
2346 if (oh->_state != _HWMOD_STATE_REGISTERED)
2347 return 0;
2348
2349 bus = of_find_node_by_name(NULL, "ocp");
2350 if (!bus)
2351 return -ENODEV;
2352
2353 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2354 if (r)
2355 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2356 else if (np && index)
2357 pr_warn("omap_hwmod: %s using broken dt data from %pOFn\n",
2358 oh->name, np);
2359
2360 r = _init_mpu_rt_base(oh, NULL, index, np);
2361 if (r < 0) {
2362 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2363 oh->name);
2364 return 0;
2365 }
2366
2367 r = _init_clocks(oh, np);
2368 if (r < 0) {
2369 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2370 return -EINVAL;
2371 }
2372
2373 if (np) {
2374 struct device_node *child;
2375
2376 parse_module_flags(oh, np);
2377 child = of_get_next_child(np, NULL);
2378 if (child)
2379 parse_module_flags(oh, child);
2380 }
2381
2382 oh->_state = _HWMOD_STATE_INITIALIZED;
2383
2384 return 0;
2385}
2386
2387/**
2388 * _setup_iclk_autoidle - configure an IP block's interface clocks
2389 * @oh: struct omap_hwmod *
2390 *
2391 * Set up the module's interface clocks. XXX This function is still mostly
2392 * a stub; implementing this properly requires iclk autoidle usecounting in
2393 * the clock code. No return value.
2394 */
2395static void _setup_iclk_autoidle(struct omap_hwmod *oh)
2396{
2397 struct omap_hwmod_ocp_if *os;
2398
2399 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2400 return;
2401
2402 list_for_each_entry(os, &oh->slave_ports, node) {
2403 if (!os->_clk)
2404 continue;
2405
2406 if (os->flags & OCPIF_SWSUP_IDLE) {
2407 /*
2408 * we might have multiple users of one iclk with
2409 * different requirements, disable autoidle when
2410 * the module is enabled, e.g. dss iclk
2411 */
2412 } else {
2413 /* we are enabling autoidle afterwards anyways */
2414 clk_enable(os->_clk);
2415 }
2416 }
2417
2418 return;
2419}
2420
2421/**
2422 * _setup_reset - reset an IP block during the setup process
2423 * @oh: struct omap_hwmod *
2424 *
2425 * Reset the IP block corresponding to the hwmod @oh during the setup
2426 * process. The IP block is first enabled so it can be successfully
2427 * reset. Returns 0 upon success or a negative error code upon
2428 * failure.
2429 */
2430static int _setup_reset(struct omap_hwmod *oh)
2431{
2432 int r = 0;
2433
2434 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2435 return -EINVAL;
2436
2437 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2438 return -EPERM;
2439
2440 if (oh->rst_lines_cnt == 0) {
2441 r = _enable(oh);
2442 if (r) {
2443 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2444 oh->name, oh->_state);
2445 return -EINVAL;
2446 }
2447 }
2448
2449 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2450 r = _reset(oh);
2451
2452 return r;
2453}
2454
2455/**
2456 * _setup_postsetup - transition to the appropriate state after _setup
2457 * @oh: struct omap_hwmod *
2458 *
2459 * Place an IP block represented by @oh into a "post-setup" state --
2460 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2461 * this function is called at the end of _setup().) The postsetup
2462 * state for an IP block can be changed by calling
2463 * omap_hwmod_enter_postsetup_state() early in the boot process,
2464 * before one of the omap_hwmod_setup*() functions are called for the
2465 * IP block.
2466 *
2467 * The IP block stays in this state until a PM runtime-based driver is
2468 * loaded for that IP block. A post-setup state of IDLE is
2469 * appropriate for almost all IP blocks with runtime PM-enabled
2470 * drivers, since those drivers are able to enable the IP block. A
2471 * post-setup state of ENABLED is appropriate for kernels with PM
2472 * runtime disabled. The DISABLED state is appropriate for unusual IP
2473 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2474 * included, since the WDTIMER starts running on reset and will reset
2475 * the MPU if left active.
2476 *
2477 * This post-setup mechanism is deprecated. Once all of the OMAP
2478 * drivers have been converted to use PM runtime, and all of the IP
2479 * block data and interconnect data is available to the hwmod code, it
2480 * should be possible to replace this mechanism with a "lazy reset"
2481 * arrangement. In a "lazy reset" setup, each IP block is enabled
2482 * when the driver first probes, then all remaining IP blocks without
2483 * drivers are either shut down or enabled after the drivers have
2484 * loaded. However, this cannot take place until the above
2485 * preconditions have been met, since otherwise the late reset code
2486 * has no way of knowing which IP blocks are in use by drivers, and
2487 * which ones are unused.
2488 *
2489 * No return value.
2490 */
2491static void _setup_postsetup(struct omap_hwmod *oh)
2492{
2493 u8 postsetup_state;
2494
2495 if (oh->rst_lines_cnt > 0)
2496 return;
2497
2498 postsetup_state = oh->_postsetup_state;
2499 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2500 postsetup_state = _HWMOD_STATE_ENABLED;
2501
2502 /*
2503 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2504 * it should be set by the core code as a runtime flag during startup
2505 */
2506 if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
2507 (postsetup_state == _HWMOD_STATE_IDLE)) {
2508 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2509 postsetup_state = _HWMOD_STATE_ENABLED;
2510 }
2511
2512 if (postsetup_state == _HWMOD_STATE_IDLE)
2513 _idle(oh);
2514 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2515 _shutdown(oh);
2516 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2517 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2518 oh->name, postsetup_state);
2519
2520 return;
2521}
2522
2523/**
2524 * _setup - prepare IP block hardware for use
2525 * @oh: struct omap_hwmod *
2526 * @n: (unused, pass NULL)
2527 *
2528 * Configure the IP block represented by @oh. This may include
2529 * enabling the IP block, resetting it, and placing it into a
2530 * post-setup state, depending on the type of IP block and applicable
2531 * flags. IP blocks are reset to prevent any previous configuration
2532 * by the bootloader or previous operating system from interfering
2533 * with power management or other parts of the system. The reset can
2534 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2535 * two phases for hwmod initialization. Code called here generally
2536 * affects the IP block hardware, or system integration hardware
2537 * associated with the IP block. Returns 0.
2538 */
2539static int _setup(struct omap_hwmod *oh, void *data)
2540{
2541 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2542 return 0;
2543
2544 if (oh->parent_hwmod) {
2545 int r;
2546
2547 r = _enable(oh->parent_hwmod);
2548 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2549 oh->name, oh->parent_hwmod->name);
2550 }
2551
2552 _setup_iclk_autoidle(oh);
2553
2554 if (!_setup_reset(oh))
2555 _setup_postsetup(oh);
2556
2557 if (oh->parent_hwmod) {
2558 u8 postsetup_state;
2559
2560 postsetup_state = oh->parent_hwmod->_postsetup_state;
2561
2562 if (postsetup_state == _HWMOD_STATE_IDLE)
2563 _idle(oh->parent_hwmod);
2564 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2565 _shutdown(oh->parent_hwmod);
2566 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2567 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2568 oh->parent_hwmod->name, postsetup_state);
2569 }
2570
2571 return 0;
2572}
2573
2574/**
2575 * _register - register a struct omap_hwmod
2576 * @oh: struct omap_hwmod *
2577 *
2578 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2579 * already has been registered by the same name; -EINVAL if the
2580 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2581 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2582 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2583 * success.
2584 *
2585 * XXX The data should be copied into bootmem, so the original data
2586 * should be marked __initdata and freed after init. This would allow
2587 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2588 * that the copy process would be relatively complex due to the large number
2589 * of substructures.
2590 */
2591static int _register(struct omap_hwmod *oh)
2592{
2593 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2594 (oh->_state != _HWMOD_STATE_UNKNOWN))
2595 return -EINVAL;
2596
2597 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2598
2599 if (_lookup(oh->name))
2600 return -EEXIST;
2601
2602 list_add_tail(&oh->node, &omap_hwmod_list);
2603
2604 INIT_LIST_HEAD(&oh->slave_ports);
2605 spin_lock_init(&oh->_lock);
2606 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2607
2608 oh->_state = _HWMOD_STATE_REGISTERED;
2609
2610 /*
2611 * XXX Rather than doing a strcmp(), this should test a flag
2612 * set in the hwmod data, inserted by the autogenerator code.
2613 */
2614 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2615 mpu_oh = oh;
2616
2617 return 0;
2618}
2619
2620/**
2621 * _add_link - add an interconnect between two IP blocks
2622 * @oi: pointer to a struct omap_hwmod_ocp_if record
2623 *
2624 * Add struct omap_hwmod_link records connecting the slave IP block
2625 * specified in @oi->slave to @oi. This code is assumed to run before
2626 * preemption or SMP has been enabled, thus avoiding the need for
2627 * locking in this code. Changes to this assumption will require
2628 * additional locking. Returns 0.
2629 */
2630static int _add_link(struct omap_hwmod_ocp_if *oi)
2631{
2632 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2633 oi->slave->name);
2634
2635 list_add(&oi->node, &oi->slave->slave_ports);
2636 oi->slave->slaves_cnt++;
2637
2638 return 0;
2639}
2640
2641/**
2642 * _register_link - register a struct omap_hwmod_ocp_if
2643 * @oi: struct omap_hwmod_ocp_if *
2644 *
2645 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2646 * has already been registered; -EINVAL if @oi is NULL or if the
2647 * record pointed to by @oi is missing required fields; or 0 upon
2648 * success.
2649 *
2650 * XXX The data should be copied into bootmem, so the original data
2651 * should be marked __initdata and freed after init. This would allow
2652 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2653 */
2654static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2655{
2656 if (!oi || !oi->master || !oi->slave || !oi->user)
2657 return -EINVAL;
2658
2659 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2660 return -EEXIST;
2661
2662 pr_debug("omap_hwmod: registering link from %s to %s\n",
2663 oi->master->name, oi->slave->name);
2664
2665 /*
2666 * Register the connected hwmods, if they haven't been
2667 * registered already
2668 */
2669 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2670 _register(oi->master);
2671
2672 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2673 _register(oi->slave);
2674
2675 _add_link(oi);
2676
2677 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2678
2679 return 0;
2680}
2681
2682/* Static functions intended only for use in soc_ops field function pointers */
2683
2684/**
2685 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2686 * @oh: struct omap_hwmod *
2687 *
2688 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2689 * does not have an IDLEST bit or if the module successfully leaves
2690 * slave idle; otherwise, pass along the return value of the
2691 * appropriate *_cm*_wait_module_ready() function.
2692 */
2693static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2694{
2695 if (!oh)
2696 return -EINVAL;
2697
2698 if (oh->flags & HWMOD_NO_IDLEST)
2699 return 0;
2700
2701 if (!_find_mpu_rt_port(oh))
2702 return 0;
2703
2704 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2705
2706 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2707 oh->prcm.omap2.idlest_reg_id,
2708 oh->prcm.omap2.idlest_idle_bit);
2709}
2710
2711/**
2712 * _omap4_wait_target_ready - wait for a module to leave slave idle
2713 * @oh: struct omap_hwmod *
2714 *
2715 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2716 * does not have an IDLEST bit or if the module successfully leaves
2717 * slave idle; otherwise, pass along the return value of the
2718 * appropriate *_cm*_wait_module_ready() function.
2719 */
2720static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2721{
2722 if (!oh)
2723 return -EINVAL;
2724
2725 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2726 return 0;
2727
2728 if (!_find_mpu_rt_port(oh))
2729 return 0;
2730
2731 if (_omap4_clkctrl_managed_by_clkfwk(oh))
2732 return 0;
2733
2734 if (!_omap4_has_clkctrl_clock(oh))
2735 return 0;
2736
2737 /* XXX check module SIDLEMODE, hardreset status */
2738
2739 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2740 oh->clkdm->cm_inst,
2741 oh->prcm.omap4.clkctrl_offs, 0);
2742}
2743
2744/**
2745 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2746 * @oh: struct omap_hwmod * to assert hardreset
2747 * @ohri: hardreset line data
2748 *
2749 * Call omap2_prm_assert_hardreset() with parameters extracted from
2750 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2751 * use as an soc_ops function pointer. Passes along the return value
2752 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2753 * for removal when the PRM code is moved into drivers/.
2754 */
2755static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2756 struct omap_hwmod_rst_info *ohri)
2757{
2758 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2759 oh->prcm.omap2.module_offs, 0);
2760}
2761
2762/**
2763 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2764 * @oh: struct omap_hwmod * to deassert hardreset
2765 * @ohri: hardreset line data
2766 *
2767 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2768 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2769 * use as an soc_ops function pointer. Passes along the return value
2770 * from omap2_prm_deassert_hardreset(). XXX This function is
2771 * scheduled for removal when the PRM code is moved into drivers/.
2772 */
2773static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2774 struct omap_hwmod_rst_info *ohri)
2775{
2776 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2777 oh->prcm.omap2.module_offs, 0, 0);
2778}
2779
2780/**
2781 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2782 * @oh: struct omap_hwmod * to test hardreset
2783 * @ohri: hardreset line data
2784 *
2785 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2786 * from the hwmod @oh and the hardreset line data @ohri. Only
2787 * intended for use as an soc_ops function pointer. Passes along the
2788 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2789 * function is scheduled for removal when the PRM code is moved into
2790 * drivers/.
2791 */
2792static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2793 struct omap_hwmod_rst_info *ohri)
2794{
2795 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2796 oh->prcm.omap2.module_offs, 0);
2797}
2798
2799/**
2800 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2801 * @oh: struct omap_hwmod * to assert hardreset
2802 * @ohri: hardreset line data
2803 *
2804 * Call omap4_prminst_assert_hardreset() with parameters extracted
2805 * from the hwmod @oh and the hardreset line data @ohri. Only
2806 * intended for use as an soc_ops function pointer. Passes along the
2807 * return value from omap4_prminst_assert_hardreset(). XXX This
2808 * function is scheduled for removal when the PRM code is moved into
2809 * drivers/.
2810 */
2811static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2812 struct omap_hwmod_rst_info *ohri)
2813{
2814 if (!oh->clkdm)
2815 return -EINVAL;
2816
2817 return omap_prm_assert_hardreset(ohri->rst_shift,
2818 oh->clkdm->pwrdm.ptr->prcm_partition,
2819 oh->clkdm->pwrdm.ptr->prcm_offs,
2820 oh->prcm.omap4.rstctrl_offs);
2821}
2822
2823/**
2824 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2825 * @oh: struct omap_hwmod * to deassert hardreset
2826 * @ohri: hardreset line data
2827 *
2828 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2829 * from the hwmod @oh and the hardreset line data @ohri. Only
2830 * intended for use as an soc_ops function pointer. Passes along the
2831 * return value from omap4_prminst_deassert_hardreset(). XXX This
2832 * function is scheduled for removal when the PRM code is moved into
2833 * drivers/.
2834 */
2835static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2836 struct omap_hwmod_rst_info *ohri)
2837{
2838 if (!oh->clkdm)
2839 return -EINVAL;
2840
2841 if (ohri->st_shift)
2842 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2843 oh->name, ohri->name);
2844 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
2845 oh->clkdm->pwrdm.ptr->prcm_partition,
2846 oh->clkdm->pwrdm.ptr->prcm_offs,
2847 oh->prcm.omap4.rstctrl_offs,
2848 oh->prcm.omap4.rstctrl_offs +
2849 OMAP4_RST_CTRL_ST_OFFSET);
2850}
2851
2852/**
2853 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2854 * @oh: struct omap_hwmod * to test hardreset
2855 * @ohri: hardreset line data
2856 *
2857 * Call omap4_prminst_is_hardreset_asserted() with parameters
2858 * extracted from the hwmod @oh and the hardreset line data @ohri.
2859 * Only intended for use as an soc_ops function pointer. Passes along
2860 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2861 * This function is scheduled for removal when the PRM code is moved
2862 * into drivers/.
2863 */
2864static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
2865 struct omap_hwmod_rst_info *ohri)
2866{
2867 if (!oh->clkdm)
2868 return -EINVAL;
2869
2870 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
2871 oh->clkdm->pwrdm.ptr->
2872 prcm_partition,
2873 oh->clkdm->pwrdm.ptr->prcm_offs,
2874 oh->prcm.omap4.rstctrl_offs);
2875}
2876
2877/**
2878 * _omap4_disable_direct_prcm - disable direct PRCM control for hwmod
2879 * @oh: struct omap_hwmod * to disable control for
2880 *
2881 * Disables direct PRCM clkctrl done by hwmod core. Instead, the hwmod
2882 * will be using its main_clk to enable/disable the module. Returns
2883 * 0 if successful.
2884 */
2885static int _omap4_disable_direct_prcm(struct omap_hwmod *oh)
2886{
2887 if (!oh)
2888 return -EINVAL;
2889
2890 oh->prcm.omap4.flags |= HWMOD_OMAP4_CLKFWK_CLKCTR_CLOCK;
2891
2892 return 0;
2893}
2894
2895/**
2896 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2897 * @oh: struct omap_hwmod * to deassert hardreset
2898 * @ohri: hardreset line data
2899 *
2900 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2901 * from the hwmod @oh and the hardreset line data @ohri. Only
2902 * intended for use as an soc_ops function pointer. Passes along the
2903 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2904 * function is scheduled for removal when the PRM code is moved into
2905 * drivers/.
2906 */
2907static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
2908 struct omap_hwmod_rst_info *ohri)
2909{
2910 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
2911 oh->clkdm->pwrdm.ptr->prcm_partition,
2912 oh->clkdm->pwrdm.ptr->prcm_offs,
2913 oh->prcm.omap4.rstctrl_offs,
2914 oh->prcm.omap4.rstst_offs);
2915}
2916
2917/* Public functions */
2918
2919u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
2920{
2921 if (oh->flags & HWMOD_16BIT_REG)
2922 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
2923 else
2924 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
2925}
2926
2927void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
2928{
2929 if (oh->flags & HWMOD_16BIT_REG)
2930 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
2931 else
2932 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
2933}
2934
2935/**
2936 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2937 * @oh: struct omap_hwmod *
2938 *
2939 * This is a public function exposed to drivers. Some drivers may need to do
2940 * some settings before and after resetting the device. Those drivers after
2941 * doing the necessary settings could use this function to start a reset by
2942 * setting the SYSCONFIG.SOFTRESET bit.
2943 */
2944int omap_hwmod_softreset(struct omap_hwmod *oh)
2945{
2946 u32 v;
2947 int ret;
2948
2949 if (!oh || !(oh->_sysc_cache))
2950 return -EINVAL;
2951
2952 v = oh->_sysc_cache;
2953 ret = _set_softreset(oh, &v);
2954 if (ret)
2955 goto error;
2956 _write_sysconfig(v, oh);
2957
2958 ret = _clear_softreset(oh, &v);
2959 if (ret)
2960 goto error;
2961 _write_sysconfig(v, oh);
2962
2963error:
2964 return ret;
2965}
2966
2967/**
2968 * omap_hwmod_lookup - look up a registered omap_hwmod by name
2969 * @name: name of the omap_hwmod to look up
2970 *
2971 * Given a @name of an omap_hwmod, return a pointer to the registered
2972 * struct omap_hwmod *, or NULL upon error.
2973 */
2974struct omap_hwmod *omap_hwmod_lookup(const char *name)
2975{
2976 struct omap_hwmod *oh;
2977
2978 if (!name)
2979 return NULL;
2980
2981 oh = _lookup(name);
2982
2983 return oh;
2984}
2985
2986/**
2987 * omap_hwmod_for_each - call function for each registered omap_hwmod
2988 * @fn: pointer to a callback function
2989 * @data: void * data to pass to callback function
2990 *
2991 * Call @fn for each registered omap_hwmod, passing @data to each
2992 * function. @fn must return 0 for success or any other value for
2993 * failure. If @fn returns non-zero, the iteration across omap_hwmods
2994 * will stop and the non-zero return value will be passed to the
2995 * caller of omap_hwmod_for_each(). @fn is called with
2996 * omap_hwmod_for_each() held.
2997 */
2998int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
2999 void *data)
3000{
3001 struct omap_hwmod *temp_oh;
3002 int ret = 0;
3003
3004 if (!fn)
3005 return -EINVAL;
3006
3007 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3008 ret = (*fn)(temp_oh, data);
3009 if (ret)
3010 break;
3011 }
3012
3013 return ret;
3014}
3015
3016/**
3017 * omap_hwmod_register_links - register an array of hwmod links
3018 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3019 *
3020 * Intended to be called early in boot before the clock framework is
3021 * initialized. If @ois is not null, will register all omap_hwmods
3022 * listed in @ois that are valid for this chip. Returns -EINVAL if
3023 * omap_hwmod_init() hasn't been called before calling this function,
3024 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3025 * success.
3026 */
3027int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3028{
3029 int r, i;
3030
3031 if (!inited)
3032 return -EINVAL;
3033
3034 if (!ois)
3035 return 0;
3036
3037 if (ois[0] == NULL) /* Empty list */
3038 return 0;
3039
3040 i = 0;
3041 do {
3042 r = _register_link(ois[i]);
3043 WARN(r && r != -EEXIST,
3044 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3045 ois[i]->master->name, ois[i]->slave->name, r);
3046 } while (ois[++i]);
3047
3048 return 0;
3049}
3050
3051/**
3052 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3053 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3054 *
3055 * If the hwmod data corresponding to the MPU subsystem IP block
3056 * hasn't been initialized and set up yet, do so now. This must be
3057 * done first since sleep dependencies may be added from other hwmods
3058 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3059 * return value.
3060 */
3061static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3062{
3063 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3064 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3065 __func__, MPU_INITIATOR_NAME);
3066 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3067 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3068}
3069
3070/**
3071 * omap_hwmod_setup_one - set up a single hwmod
3072 * @oh_name: const char * name of the already-registered hwmod to set up
3073 *
3074 * Initialize and set up a single hwmod. Intended to be used for a
3075 * small number of early devices, such as the timer IP blocks used for
3076 * the scheduler clock. Must be called after omap2_clk_init().
3077 * Resolves the struct clk names to struct clk pointers for each
3078 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3079 * -EINVAL upon error or 0 upon success.
3080 */
3081int __init omap_hwmod_setup_one(const char *oh_name)
3082{
3083 struct omap_hwmod *oh;
3084
3085 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3086
3087 oh = _lookup(oh_name);
3088 if (!oh) {
3089 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3090 return -EINVAL;
3091 }
3092
3093 _ensure_mpu_hwmod_is_setup(oh);
3094
3095 _init(oh, NULL);
3096 _setup(oh, NULL);
3097
3098 return 0;
3099}
3100
3101static void omap_hwmod_check_one(struct device *dev,
3102 const char *name, s8 v1, u8 v2)
3103{
3104 if (v1 < 0)
3105 return;
3106
3107 if (v1 != v2)
3108 dev_warn(dev, "%s %d != %d\n", name, v1, v2);
3109}
3110
3111/**
3112 * omap_hwmod_check_sysc - check sysc against platform sysc
3113 * @dev: struct device
3114 * @data: module data
3115 * @sysc_fields: new sysc configuration
3116 */
3117static int omap_hwmod_check_sysc(struct device *dev,
3118 const struct ti_sysc_module_data *data,
3119 struct sysc_regbits *sysc_fields)
3120{
3121 const struct sysc_regbits *regbits = data->cap->regbits;
3122
3123 omap_hwmod_check_one(dev, "dmadisable_shift",
3124 regbits->dmadisable_shift,
3125 sysc_fields->dmadisable_shift);
3126 omap_hwmod_check_one(dev, "midle_shift",
3127 regbits->midle_shift,
3128 sysc_fields->midle_shift);
3129 omap_hwmod_check_one(dev, "sidle_shift",
3130 regbits->sidle_shift,
3131 sysc_fields->sidle_shift);
3132 omap_hwmod_check_one(dev, "clkact_shift",
3133 regbits->clkact_shift,
3134 sysc_fields->clkact_shift);
3135 omap_hwmod_check_one(dev, "enwkup_shift",
3136 regbits->enwkup_shift,
3137 sysc_fields->enwkup_shift);
3138 omap_hwmod_check_one(dev, "srst_shift",
3139 regbits->srst_shift,
3140 sysc_fields->srst_shift);
3141 omap_hwmod_check_one(dev, "autoidle_shift",
3142 regbits->autoidle_shift,
3143 sysc_fields->autoidle_shift);
3144
3145 return 0;
3146}
3147
3148/**
3149 * omap_hwmod_init_regbits - init sysconfig specific register bits
3150 * @dev: struct device
3151 * @oh: module
3152 * @data: module data
3153 * @sysc_fields: new sysc configuration
3154 */
3155static int omap_hwmod_init_regbits(struct device *dev, struct omap_hwmod *oh,
3156 const struct ti_sysc_module_data *data,
3157 struct sysc_regbits **sysc_fields)
3158{
3159 switch (data->cap->type) {
3160 case TI_SYSC_OMAP2:
3161 case TI_SYSC_OMAP2_TIMER:
3162 *sysc_fields = &omap_hwmod_sysc_type1;
3163 break;
3164 case TI_SYSC_OMAP3_SHAM:
3165 *sysc_fields = &omap3_sham_sysc_fields;
3166 break;
3167 case TI_SYSC_OMAP3_AES:
3168 *sysc_fields = &omap3xxx_aes_sysc_fields;
3169 break;
3170 case TI_SYSC_OMAP4:
3171 case TI_SYSC_OMAP4_TIMER:
3172 *sysc_fields = &omap_hwmod_sysc_type2;
3173 break;
3174 case TI_SYSC_OMAP4_SIMPLE:
3175 *sysc_fields = &omap_hwmod_sysc_type3;
3176 break;
3177 case TI_SYSC_OMAP34XX_SR:
3178 *sysc_fields = &omap34xx_sr_sysc_fields;
3179 break;
3180 case TI_SYSC_OMAP36XX_SR:
3181 *sysc_fields = &omap36xx_sr_sysc_fields;
3182 break;
3183 case TI_SYSC_OMAP4_SR:
3184 *sysc_fields = &omap36xx_sr_sysc_fields;
3185 break;
3186 case TI_SYSC_OMAP4_MCASP:
3187 *sysc_fields = &omap_hwmod_sysc_type_mcasp;
3188 break;
3189 case TI_SYSC_OMAP4_USB_HOST_FS:
3190 *sysc_fields = &omap_hwmod_sysc_type_usb_host_fs;
3191 break;
3192 default:
3193 *sysc_fields = NULL;
3194 if (!oh->class->sysc->sysc_fields)
3195 return 0;
3196
3197 dev_err(dev, "sysc_fields not found\n");
3198
3199 return -EINVAL;
3200 }
3201
3202 return omap_hwmod_check_sysc(dev, data, *sysc_fields);
3203}
3204
3205/**
3206 * omap_hwmod_init_reg_offs - initialize sysconfig register offsets
3207 * @dev: struct device
3208 * @data: module data
3209 * @rev_offs: revision register offset
3210 * @sysc_offs: sysc register offset
3211 * @syss_offs: syss register offset
3212 */
3213static int omap_hwmod_init_reg_offs(struct device *dev,
3214 const struct ti_sysc_module_data *data,
3215 s32 *rev_offs, s32 *sysc_offs,
3216 s32 *syss_offs)
3217{
3218 *rev_offs = -ENODEV;
3219 *sysc_offs = 0;
3220 *syss_offs = 0;
3221
3222 if (data->offsets[SYSC_REVISION] >= 0)
3223 *rev_offs = data->offsets[SYSC_REVISION];
3224
3225 if (data->offsets[SYSC_SYSCONFIG] >= 0)
3226 *sysc_offs = data->offsets[SYSC_SYSCONFIG];
3227
3228 if (data->offsets[SYSC_SYSSTATUS] >= 0)
3229 *syss_offs = data->offsets[SYSC_SYSSTATUS];
3230
3231 return 0;
3232}
3233
3234/**
3235 * omap_hwmod_init_sysc_flags - initialize sysconfig features
3236 * @dev: struct device
3237 * @data: module data
3238 * @sysc_flags: module configuration
3239 */
3240static int omap_hwmod_init_sysc_flags(struct device *dev,
3241 const struct ti_sysc_module_data *data,
3242 u32 *sysc_flags)
3243{
3244 *sysc_flags = 0;
3245
3246 switch (data->cap->type) {
3247 case TI_SYSC_OMAP2:
3248 case TI_SYSC_OMAP2_TIMER:
3249 /* See SYSC_OMAP2_* in include/dt-bindings/bus/ti-sysc.h */
3250 if (data->cfg->sysc_val & SYSC_OMAP2_CLOCKACTIVITY)
3251 *sysc_flags |= SYSC_HAS_CLOCKACTIVITY;
3252 if (data->cfg->sysc_val & SYSC_OMAP2_EMUFREE)
3253 *sysc_flags |= SYSC_HAS_EMUFREE;
3254 if (data->cfg->sysc_val & SYSC_OMAP2_ENAWAKEUP)
3255 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3256 if (data->cfg->sysc_val & SYSC_OMAP2_SOFTRESET)
3257 *sysc_flags |= SYSC_HAS_SOFTRESET;
3258 if (data->cfg->sysc_val & SYSC_OMAP2_AUTOIDLE)
3259 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3260 break;
3261 case TI_SYSC_OMAP4:
3262 case TI_SYSC_OMAP4_TIMER:
3263 /* See SYSC_OMAP4_* in include/dt-bindings/bus/ti-sysc.h */
3264 if (data->cfg->sysc_val & SYSC_OMAP4_DMADISABLE)
3265 *sysc_flags |= SYSC_HAS_DMADISABLE;
3266 if (data->cfg->sysc_val & SYSC_OMAP4_FREEEMU)
3267 *sysc_flags |= SYSC_HAS_EMUFREE;
3268 if (data->cfg->sysc_val & SYSC_OMAP4_SOFTRESET)
3269 *sysc_flags |= SYSC_HAS_SOFTRESET;
3270 break;
3271 case TI_SYSC_OMAP34XX_SR:
3272 case TI_SYSC_OMAP36XX_SR:
3273 /* See SYSC_OMAP3_SR_* in include/dt-bindings/bus/ti-sysc.h */
3274 if (data->cfg->sysc_val & SYSC_OMAP3_SR_ENAWAKEUP)
3275 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3276 break;
3277 default:
3278 if (data->cap->regbits->emufree_shift >= 0)
3279 *sysc_flags |= SYSC_HAS_EMUFREE;
3280 if (data->cap->regbits->enwkup_shift >= 0)
3281 *sysc_flags |= SYSC_HAS_ENAWAKEUP;
3282 if (data->cap->regbits->srst_shift >= 0)
3283 *sysc_flags |= SYSC_HAS_SOFTRESET;
3284 if (data->cap->regbits->autoidle_shift >= 0)
3285 *sysc_flags |= SYSC_HAS_AUTOIDLE;
3286 break;
3287 }
3288
3289 if (data->cap->regbits->midle_shift >= 0 &&
3290 data->cfg->midlemodes)
3291 *sysc_flags |= SYSC_HAS_MIDLEMODE;
3292
3293 if (data->cap->regbits->sidle_shift >= 0 &&
3294 data->cfg->sidlemodes)
3295 *sysc_flags |= SYSC_HAS_SIDLEMODE;
3296
3297 if (data->cfg->quirks & SYSC_QUIRK_UNCACHED)
3298 *sysc_flags |= SYSC_NO_CACHE;
3299 if (data->cfg->quirks & SYSC_QUIRK_RESET_STATUS)
3300 *sysc_flags |= SYSC_HAS_RESET_STATUS;
3301
3302 if (data->cfg->syss_mask & 1)
3303 *sysc_flags |= SYSS_HAS_RESET_STATUS;
3304
3305 return 0;
3306}
3307
3308/**
3309 * omap_hwmod_init_idlemodes - initialize module idle modes
3310 * @dev: struct device
3311 * @data: module data
3312 * @idlemodes: module supported idle modes
3313 */
3314static int omap_hwmod_init_idlemodes(struct device *dev,
3315 const struct ti_sysc_module_data *data,
3316 u32 *idlemodes)
3317{
3318 *idlemodes = 0;
3319
3320 if (data->cfg->midlemodes & BIT(SYSC_IDLE_FORCE))
3321 *idlemodes |= MSTANDBY_FORCE;
3322 if (data->cfg->midlemodes & BIT(SYSC_IDLE_NO))
3323 *idlemodes |= MSTANDBY_NO;
3324 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART))
3325 *idlemodes |= MSTANDBY_SMART;
3326 if (data->cfg->midlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3327 *idlemodes |= MSTANDBY_SMART_WKUP;
3328
3329 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_FORCE))
3330 *idlemodes |= SIDLE_FORCE;
3331 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_NO))
3332 *idlemodes |= SIDLE_NO;
3333 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART))
3334 *idlemodes |= SIDLE_SMART;
3335 if (data->cfg->sidlemodes & BIT(SYSC_IDLE_SMART_WKUP))
3336 *idlemodes |= SIDLE_SMART_WKUP;
3337
3338 return 0;
3339}
3340
3341/**
3342 * omap_hwmod_check_module - check new module against platform data
3343 * @dev: struct device
3344 * @oh: module
3345 * @data: new module data
3346 * @sysc_fields: sysc register bits
3347 * @rev_offs: revision register offset
3348 * @sysc_offs: sysconfig register offset
3349 * @syss_offs: sysstatus register offset
3350 * @sysc_flags: sysc specific flags
3351 * @idlemodes: sysc supported idlemodes
3352 */
3353static int omap_hwmod_check_module(struct device *dev,
3354 struct omap_hwmod *oh,
3355 const struct ti_sysc_module_data *data,
3356 struct sysc_regbits *sysc_fields,
3357 s32 rev_offs, s32 sysc_offs,
3358 s32 syss_offs, u32 sysc_flags,
3359 u32 idlemodes)
3360{
3361 if (!oh->class->sysc)
3362 return -ENODEV;
3363
3364 if (oh->class->sysc->sysc_fields &&
3365 sysc_fields != oh->class->sysc->sysc_fields)
3366 dev_warn(dev, "sysc_fields mismatch\n");
3367
3368 if (rev_offs != oh->class->sysc->rev_offs)
3369 dev_warn(dev, "rev_offs %08x != %08x\n", rev_offs,
3370 oh->class->sysc->rev_offs);
3371 if (sysc_offs != oh->class->sysc->sysc_offs)
3372 dev_warn(dev, "sysc_offs %08x != %08x\n", sysc_offs,
3373 oh->class->sysc->sysc_offs);
3374 if (syss_offs != oh->class->sysc->syss_offs)
3375 dev_warn(dev, "syss_offs %08x != %08x\n", syss_offs,
3376 oh->class->sysc->syss_offs);
3377
3378 if (sysc_flags != oh->class->sysc->sysc_flags)
3379 dev_warn(dev, "sysc_flags %08x != %08x\n", sysc_flags,
3380 oh->class->sysc->sysc_flags);
3381
3382 if (idlemodes != oh->class->sysc->idlemodes)
3383 dev_warn(dev, "idlemodes %08x != %08x\n", idlemodes,
3384 oh->class->sysc->idlemodes);
3385
3386 if (data->cfg->srst_udelay != oh->class->sysc->srst_udelay)
3387 dev_warn(dev, "srst_udelay %i != %i\n",
3388 data->cfg->srst_udelay,
3389 oh->class->sysc->srst_udelay);
3390
3391 return 0;
3392}
3393
3394/**
3395 * omap_hwmod_allocate_module - allocate new module
3396 * @dev: struct device
3397 * @oh: module
3398 * @sysc_fields: sysc register bits
3399 * @clockdomain: clockdomain
3400 * @rev_offs: revision register offset
3401 * @sysc_offs: sysconfig register offset
3402 * @syss_offs: sysstatus register offset
3403 * @sysc_flags: sysc specific flags
3404 * @idlemodes: sysc supported idlemodes
3405 *
3406 * Note that the allocations here cannot use devm as ti-sysc can rebind.
3407 */
3408static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
3409 const struct ti_sysc_module_data *data,
3410 struct sysc_regbits *sysc_fields,
3411 struct clockdomain *clkdm,
3412 s32 rev_offs, s32 sysc_offs,
3413 s32 syss_offs, u32 sysc_flags,
3414 u32 idlemodes)
3415{
3416 struct omap_hwmod_class_sysconfig *sysc;
3417 struct omap_hwmod_class *class = NULL;
3418 struct omap_hwmod_ocp_if *oi = NULL;
3419 void __iomem *regs = NULL;
3420 unsigned long flags;
3421
3422 sysc = kzalloc(sizeof(*sysc), GFP_KERNEL);
3423 if (!sysc)
3424 return -ENOMEM;
3425
3426 sysc->sysc_fields = sysc_fields;
3427 sysc->rev_offs = rev_offs;
3428 sysc->sysc_offs = sysc_offs;
3429 sysc->syss_offs = syss_offs;
3430 sysc->sysc_flags = sysc_flags;
3431 sysc->idlemodes = idlemodes;
3432 sysc->srst_udelay = data->cfg->srst_udelay;
3433
3434 if (!oh->_mpu_rt_va) {
3435 regs = ioremap(data->module_pa,
3436 data->module_size);
3437 if (!regs)
3438 goto out_free_sysc;
3439 }
3440
3441 /*
3442 * We may need a new oh->class as the other devices in the same class
3443 * may not yet have ioremapped their registers.
3444 */
3445 if (oh->class->name && strcmp(oh->class->name, data->name)) {
3446 class = kmemdup(oh->class, sizeof(*oh->class), GFP_KERNEL);
3447 if (!class)
3448 goto out_unmap;
3449 }
3450
3451 if (list_empty(&oh->slave_ports)) {
3452 oi = kcalloc(1, sizeof(*oi), GFP_KERNEL);
3453 if (!oi)
3454 goto out_free_class;
3455
3456 /*
3457 * Note that we assume interconnect interface clocks will be
3458 * managed by the interconnect driver for OCPIF_SWSUP_IDLE case
3459 * on omap24xx and omap3.
3460 */
3461 oi->slave = oh;
3462 oi->user = OCP_USER_MPU | OCP_USER_SDMA;
3463 }
3464
3465 spin_lock_irqsave(&oh->_lock, flags);
3466 if (regs)
3467 oh->_mpu_rt_va = regs;
3468 if (class)
3469 oh->class = class;
3470 oh->class->sysc = sysc;
3471 if (oi)
3472 _add_link(oi);
3473 if (clkdm)
3474 oh->clkdm = clkdm;
3475 oh->_state = _HWMOD_STATE_INITIALIZED;
3476 oh->_postsetup_state = _HWMOD_STATE_DEFAULT;
3477 _setup(oh, NULL);
3478 spin_unlock_irqrestore(&oh->_lock, flags);
3479
3480 return 0;
3481
3482out_free_class:
3483 kfree(class);
3484out_unmap:
3485 iounmap(regs);
3486out_free_sysc:
3487 kfree(sysc);
3488 return -ENOMEM;
3489}
3490
3491static const struct omap_hwmod_reset omap24xx_reset_quirks[] = {
3492 { .match = "msdi", .len = 4, .reset = omap_msdi_reset, },
3493};
3494
3495static const struct omap_hwmod_reset dra7_reset_quirks[] = {
3496 { .match = "pcie", .len = 4, .reset = dra7xx_pciess_reset, },
3497};
3498
3499static const struct omap_hwmod_reset omap_reset_quirks[] = {
3500 { .match = "dss_core", .len = 8, .reset = omap_dss_reset, },
3501 { .match = "hdq1w", .len = 5, .reset = omap_hdq1w_reset, },
3502 { .match = "i2c", .len = 3, .reset = omap_i2c_reset, },
3503 { .match = "wd_timer", .len = 8, .reset = omap2_wd_timer_reset, },
3504};
3505
3506static void
3507omap_hwmod_init_reset_quirk(struct device *dev, struct omap_hwmod *oh,
3508 const struct ti_sysc_module_data *data,
3509 const struct omap_hwmod_reset *quirks,
3510 int quirks_sz)
3511{
3512 const struct omap_hwmod_reset *quirk;
3513 int i;
3514
3515 for (i = 0; i < quirks_sz; i++) {
3516 quirk = &quirks[i];
3517 if (!strncmp(data->name, quirk->match, quirk->len)) {
3518 oh->class->reset = quirk->reset;
3519
3520 return;
3521 }
3522 }
3523}
3524
3525static void
3526omap_hwmod_init_reset_quirks(struct device *dev, struct omap_hwmod *oh,
3527 const struct ti_sysc_module_data *data)
3528{
3529 if (soc_is_omap24xx())
3530 omap_hwmod_init_reset_quirk(dev, oh, data,
3531 omap24xx_reset_quirks,
3532 ARRAY_SIZE(omap24xx_reset_quirks));
3533
3534 if (soc_is_dra7xx())
3535 omap_hwmod_init_reset_quirk(dev, oh, data, dra7_reset_quirks,
3536 ARRAY_SIZE(dra7_reset_quirks));
3537
3538 omap_hwmod_init_reset_quirk(dev, oh, data, omap_reset_quirks,
3539 ARRAY_SIZE(omap_reset_quirks));
3540}
3541
3542/**
3543 * omap_hwmod_init_module - initialize new module
3544 * @dev: struct device
3545 * @data: module data
3546 * @cookie: cookie for the caller to use for later calls
3547 */
3548int omap_hwmod_init_module(struct device *dev,
3549 const struct ti_sysc_module_data *data,
3550 struct ti_sysc_cookie *cookie)
3551{
3552 struct omap_hwmod *oh;
3553 struct sysc_regbits *sysc_fields;
3554 s32 rev_offs, sysc_offs, syss_offs;
3555 u32 sysc_flags, idlemodes;
3556 int error;
3557
3558 if (!dev || !data || !data->name || !cookie)
3559 return -EINVAL;
3560
3561 oh = _lookup(data->name);
3562 if (!oh) {
3563 oh = kzalloc(sizeof(*oh), GFP_KERNEL);
3564 if (!oh)
3565 return -ENOMEM;
3566
3567 oh->name = data->name;
3568 oh->_state = _HWMOD_STATE_UNKNOWN;
3569 lockdep_register_key(&oh->hwmod_key);
3570
3571 /* Unused, can be handled by PRM driver handling resets */
3572 oh->prcm.omap4.flags = HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT;
3573
3574 oh->class = kzalloc(sizeof(*oh->class), GFP_KERNEL);
3575 if (!oh->class) {
3576 kfree(oh);
3577 return -ENOMEM;
3578 }
3579
3580 omap_hwmod_init_reset_quirks(dev, oh, data);
3581
3582 oh->class->name = data->name;
3583 mutex_lock(&list_lock);
3584 error = _register(oh);
3585 mutex_unlock(&list_lock);
3586 }
3587
3588 cookie->data = oh;
3589
3590 error = omap_hwmod_init_regbits(dev, oh, data, &sysc_fields);
3591 if (error)
3592 return error;
3593
3594 error = omap_hwmod_init_reg_offs(dev, data, &rev_offs,
3595 &sysc_offs, &syss_offs);
3596 if (error)
3597 return error;
3598
3599 error = omap_hwmod_init_sysc_flags(dev, data, &sysc_flags);
3600 if (error)
3601 return error;
3602
3603 error = omap_hwmod_init_idlemodes(dev, data, &idlemodes);
3604 if (error)
3605 return error;
3606
3607 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE)
3608 oh->flags |= HWMOD_NO_IDLE;
3609 if (data->cfg->quirks & SYSC_QUIRK_NO_IDLE_ON_INIT)
3610 oh->flags |= HWMOD_INIT_NO_IDLE;
3611 if (data->cfg->quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
3612 oh->flags |= HWMOD_INIT_NO_RESET;
3613 if (data->cfg->quirks & SYSC_QUIRK_USE_CLOCKACT)
3614 oh->flags |= HWMOD_SET_DEFAULT_CLOCKACT;
3615 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE)
3616 oh->flags |= HWMOD_SWSUP_SIDLE;
3617 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT)
3618 oh->flags |= HWMOD_SWSUP_SIDLE_ACT;
3619 if (data->cfg->quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
3620 oh->flags |= HWMOD_SWSUP_MSTANDBY;
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 _ensure_mpu_hwmod_is_setup(NULL);
3681
3682 omap_hwmod_for_each(_init, NULL);
3683#ifdef CONFIG_SERIAL_EARLYCON
3684 omap_hwmod_setup_earlycon_flags();
3685#endif
3686 omap_hwmod_for_each(_setup, NULL);
3687
3688 return 0;
3689}
3690omap_postcore_initcall(omap_hwmod_setup_all);
3691
3692/**
3693 * omap_hwmod_enable - enable an omap_hwmod
3694 * @oh: struct omap_hwmod *
3695 *
3696 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3697 * Returns -EINVAL on error or passes along the return value from _enable().
3698 */
3699int omap_hwmod_enable(struct omap_hwmod *oh)
3700{
3701 int r;
3702 unsigned long flags;
3703
3704 if (!oh)
3705 return -EINVAL;
3706
3707 spin_lock_irqsave(&oh->_lock, flags);
3708 r = _enable(oh);
3709 spin_unlock_irqrestore(&oh->_lock, flags);
3710
3711 return r;
3712}
3713
3714/**
3715 * omap_hwmod_idle - idle an omap_hwmod
3716 * @oh: struct omap_hwmod *
3717 *
3718 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3719 * Returns -EINVAL on error or passes along the return value from _idle().
3720 */
3721int omap_hwmod_idle(struct omap_hwmod *oh)
3722{
3723 int r;
3724 unsigned long flags;
3725
3726 if (!oh)
3727 return -EINVAL;
3728
3729 spin_lock_irqsave(&oh->_lock, flags);
3730 r = _idle(oh);
3731 spin_unlock_irqrestore(&oh->_lock, flags);
3732
3733 return r;
3734}
3735
3736/**
3737 * omap_hwmod_shutdown - shutdown an omap_hwmod
3738 * @oh: struct omap_hwmod *
3739 *
3740 * Shutdown an omap_hwmod @oh. Intended to be called by
3741 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3742 * the return value from _shutdown().
3743 */
3744int omap_hwmod_shutdown(struct omap_hwmod *oh)
3745{
3746 int r;
3747 unsigned long flags;
3748
3749 if (!oh)
3750 return -EINVAL;
3751
3752 spin_lock_irqsave(&oh->_lock, flags);
3753 r = _shutdown(oh);
3754 spin_unlock_irqrestore(&oh->_lock, flags);
3755
3756 return r;
3757}
3758
3759/*
3760 * IP block data retrieval functions
3761 */
3762
3763/**
3764 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3765 * @oh: struct omap_hwmod *
3766 *
3767 * Return the powerdomain pointer associated with the OMAP module
3768 * @oh's main clock. If @oh does not have a main clk, return the
3769 * powerdomain associated with the interface clock associated with the
3770 * module's MPU port. (XXX Perhaps this should use the SDMA port
3771 * instead?) Returns NULL on error, or a struct powerdomain * on
3772 * success.
3773 */
3774struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3775{
3776 struct clk *c;
3777 struct omap_hwmod_ocp_if *oi;
3778 struct clockdomain *clkdm;
3779 struct clk_hw_omap *clk;
3780
3781 if (!oh)
3782 return NULL;
3783
3784 if (oh->clkdm)
3785 return oh->clkdm->pwrdm.ptr;
3786
3787 if (oh->_clk) {
3788 c = oh->_clk;
3789 } else {
3790 oi = _find_mpu_rt_port(oh);
3791 if (!oi)
3792 return NULL;
3793 c = oi->_clk;
3794 }
3795
3796 clk = to_clk_hw_omap(__clk_get_hw(c));
3797 clkdm = clk->clkdm;
3798 if (!clkdm)
3799 return NULL;
3800
3801 return clkdm->pwrdm.ptr;
3802}
3803
3804/**
3805 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3806 * @oh: struct omap_hwmod *
3807 *
3808 * Returns the virtual address corresponding to the beginning of the
3809 * module's register target, in the address range that is intended to
3810 * be used by the MPU. Returns the virtual address upon success or NULL
3811 * upon error.
3812 */
3813void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3814{
3815 if (!oh)
3816 return NULL;
3817
3818 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3819 return NULL;
3820
3821 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3822 return NULL;
3823
3824 return oh->_mpu_rt_va;
3825}
3826
3827/*
3828 * XXX what about functions for drivers to save/restore ocp_sysconfig
3829 * for context save/restore operations?
3830 */
3831
3832/**
3833 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3834 * contained in the hwmod module.
3835 * @oh: struct omap_hwmod *
3836 * @name: name of the reset line to lookup and assert
3837 *
3838 * Some IP like dsp, ipu or iva contain processor that require
3839 * an HW reset line to be assert / deassert in order to enable fully
3840 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3841 * yet supported on this OMAP; otherwise, passes along the return value
3842 * from _assert_hardreset().
3843 */
3844int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3845{
3846 int ret;
3847 unsigned long flags;
3848
3849 if (!oh)
3850 return -EINVAL;
3851
3852 spin_lock_irqsave(&oh->_lock, flags);
3853 ret = _assert_hardreset(oh, name);
3854 spin_unlock_irqrestore(&oh->_lock, flags);
3855
3856 return ret;
3857}
3858
3859/**
3860 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3861 * contained in the hwmod module.
3862 * @oh: struct omap_hwmod *
3863 * @name: name of the reset line to look up and deassert
3864 *
3865 * Some IP like dsp, ipu or iva contain processor that require
3866 * an HW reset line to be assert / deassert in order to enable fully
3867 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3868 * yet supported on this OMAP; otherwise, passes along the return value
3869 * from _deassert_hardreset().
3870 */
3871int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3872{
3873 int ret;
3874 unsigned long flags;
3875
3876 if (!oh)
3877 return -EINVAL;
3878
3879 spin_lock_irqsave(&oh->_lock, flags);
3880 ret = _deassert_hardreset(oh, name);
3881 spin_unlock_irqrestore(&oh->_lock, flags);
3882
3883 return ret;
3884}
3885
3886/**
3887 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3888 * @classname: struct omap_hwmod_class name to search for
3889 * @fn: callback function pointer to call for each hwmod in class @classname
3890 * @user: arbitrary context data to pass to the callback function
3891 *
3892 * For each omap_hwmod of class @classname, call @fn.
3893 * If the callback function returns something other than
3894 * zero, the iterator is terminated, and the callback function's return
3895 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3896 * if @classname or @fn are NULL, or passes back the error code from @fn.
3897 */
3898int omap_hwmod_for_each_by_class(const char *classname,
3899 int (*fn)(struct omap_hwmod *oh,
3900 void *user),
3901 void *user)
3902{
3903 struct omap_hwmod *temp_oh;
3904 int ret = 0;
3905
3906 if (!classname || !fn)
3907 return -EINVAL;
3908
3909 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3910 __func__, classname);
3911
3912 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3913 if (!strcmp(temp_oh->class->name, classname)) {
3914 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3915 __func__, temp_oh->name);
3916 ret = (*fn)(temp_oh, user);
3917 if (ret)
3918 break;
3919 }
3920 }
3921
3922 if (ret)
3923 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3924 __func__, ret);
3925
3926 return ret;
3927}
3928
3929/**
3930 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3931 * @oh: struct omap_hwmod *
3932 * @state: state that _setup() should leave the hwmod in
3933 *
3934 * Sets the hwmod state that @oh will enter at the end of _setup()
3935 * (called by omap_hwmod_setup_*()). See also the documentation
3936 * for _setup_postsetup(), above. Returns 0 upon success or
3937 * -EINVAL if there is a problem with the arguments or if the hwmod is
3938 * in the wrong state.
3939 */
3940int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3941{
3942 int ret;
3943 unsigned long flags;
3944
3945 if (!oh)
3946 return -EINVAL;
3947
3948 if (state != _HWMOD_STATE_DISABLED &&
3949 state != _HWMOD_STATE_ENABLED &&
3950 state != _HWMOD_STATE_IDLE)
3951 return -EINVAL;
3952
3953 spin_lock_irqsave(&oh->_lock, flags);
3954
3955 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3956 ret = -EINVAL;
3957 goto ohsps_unlock;
3958 }
3959
3960 oh->_postsetup_state = state;
3961 ret = 0;
3962
3963ohsps_unlock:
3964 spin_unlock_irqrestore(&oh->_lock, flags);
3965
3966 return ret;
3967}
3968
3969/**
3970 * omap_hwmod_get_context_loss_count - get lost context count
3971 * @oh: struct omap_hwmod *
3972 *
3973 * Returns the context loss count of associated @oh
3974 * upon success, or zero if no context loss data is available.
3975 *
3976 * On OMAP4, this queries the per-hwmod context loss register,
3977 * assuming one exists. If not, or on OMAP2/3, this queries the
3978 * enclosing powerdomain context loss count.
3979 */
3980int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3981{
3982 struct powerdomain *pwrdm;
3983 int ret = 0;
3984
3985 if (soc_ops.get_context_lost)
3986 return soc_ops.get_context_lost(oh);
3987
3988 pwrdm = omap_hwmod_get_pwrdm(oh);
3989 if (pwrdm)
3990 ret = pwrdm_get_context_loss_count(pwrdm);
3991
3992 return ret;
3993}
3994
3995/**
3996 * omap_hwmod_init - initialize the hwmod code
3997 *
3998 * Sets up some function pointers needed by the hwmod code to operate on the
3999 * currently-booted SoC. Intended to be called once during kernel init
4000 * before any hwmods are registered. No return value.
4001 */
4002void __init omap_hwmod_init(void)
4003{
4004 if (cpu_is_omap24xx()) {
4005 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4006 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4007 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4008 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4009 } else if (cpu_is_omap34xx()) {
4010 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
4011 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4012 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4013 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4014 soc_ops.init_clkdm = _init_clkdm;
4015 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
4016 soc_ops.enable_module = _omap4_enable_module;
4017 soc_ops.disable_module = _omap4_disable_module;
4018 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4019 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4020 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4021 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4022 soc_ops.init_clkdm = _init_clkdm;
4023 soc_ops.update_context_lost = _omap4_update_context_lost;
4024 soc_ops.get_context_lost = _omap4_get_context_lost;
4025 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4026 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4027 } else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
4028 soc_is_am43xx()) {
4029 soc_ops.enable_module = _omap4_enable_module;
4030 soc_ops.disable_module = _omap4_disable_module;
4031 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4032 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4033 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4034 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4035 soc_ops.init_clkdm = _init_clkdm;
4036 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
4037 soc_ops.xlate_clkctrl = _omap4_xlate_clkctrl;
4038 } else {
4039 WARN(1, "omap_hwmod: unknown SoC type\n");
4040 }
4041
4042 _init_clkctrl_providers();
4043
4044 inited = true;
4045}
4046
4047/**
4048 * omap_hwmod_get_main_clk - get pointer to main clock name
4049 * @oh: struct omap_hwmod *
4050 *
4051 * Returns the main clock name assocated with @oh upon success,
4052 * or NULL if @oh is NULL.
4053 */
4054const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4055{
4056 if (!oh)
4057 return NULL;
4058
4059 return oh->main_clk;
4060}