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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/*
2 * omap_hwmod implementation for OMAP2/3/4
3 *
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 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 * | ({read,write}l_relaxed, 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/clk-provider.h>
135#include <linux/delay.h>
136#include <linux/err.h>
137#include <linux/list.h>
138#include <linux/mutex.h>
139#include <linux/spinlock.h>
140#include <linux/slab.h>
141#include <linux/bootmem.h>
142#include <linux/cpu.h>
143#include <linux/of.h>
144#include <linux/of_address.h>
145
146#include <asm/system_misc.h>
147
148#include "clock.h"
149#include "omap_hwmod.h"
150
151#include "soc.h"
152#include "common.h"
153#include "clockdomain.h"
154#include "powerdomain.h"
155#include "cm2xxx.h"
156#include "cm3xxx.h"
157#include "cm33xx.h"
158#include "prm.h"
159#include "prm3xxx.h"
160#include "prm44xx.h"
161#include "prm33xx.h"
162#include "prminst44xx.h"
163#include "pm.h"
164
165/* Name of the OMAP hwmod for the MPU */
166#define MPU_INITIATOR_NAME "mpu"
167
168/*
169 * Number of struct omap_hwmod_link records per struct
170 * omap_hwmod_ocp_if record (master->slave and slave->master)
171 */
172#define LINKS_PER_OCP_IF 2
173
174/*
175 * Address offset (in bytes) between the reset control and the reset
176 * status registers: 4 bytes on OMAP4
177 */
178#define OMAP4_RST_CTRL_ST_OFFSET 4
179
180/*
181 * Maximum length for module clock handle names
182 */
183#define MOD_CLK_MAX_NAME_LEN 32
184
185/**
186 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
187 * @enable_module: function to enable a module (via MODULEMODE)
188 * @disable_module: function to disable a module (via MODULEMODE)
189 *
190 * XXX Eventually this functionality will be hidden inside the PRM/CM
191 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
192 * conditionals in this code.
193 */
194struct omap_hwmod_soc_ops {
195 void (*enable_module)(struct omap_hwmod *oh);
196 int (*disable_module)(struct omap_hwmod *oh);
197 int (*wait_target_ready)(struct omap_hwmod *oh);
198 int (*assert_hardreset)(struct omap_hwmod *oh,
199 struct omap_hwmod_rst_info *ohri);
200 int (*deassert_hardreset)(struct omap_hwmod *oh,
201 struct omap_hwmod_rst_info *ohri);
202 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
203 struct omap_hwmod_rst_info *ohri);
204 int (*init_clkdm)(struct omap_hwmod *oh);
205 void (*update_context_lost)(struct omap_hwmod *oh);
206 int (*get_context_lost)(struct omap_hwmod *oh);
207 int (*disable_direct_prcm)(struct omap_hwmod *oh);
208};
209
210/* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
211static struct omap_hwmod_soc_ops soc_ops;
212
213/* omap_hwmod_list contains all registered struct omap_hwmods */
214static LIST_HEAD(omap_hwmod_list);
215
216/* mpu_oh: used to add/remove MPU initiator from sleepdep list */
217static struct omap_hwmod *mpu_oh;
218
219/*
220 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
221 * allocated from - used to reduce the number of small memory
222 * allocations, which has a significant impact on performance
223 */
224static struct omap_hwmod_link *linkspace;
225
226/*
227 * free_ls, max_ls: array indexes into linkspace; representing the
228 * next free struct omap_hwmod_link index, and the maximum number of
229 * struct omap_hwmod_link records allocated (respectively)
230 */
231static unsigned short free_ls, max_ls, ls_supp;
232
233/* inited: set to true once the hwmod code is initialized */
234static bool inited;
235
236/* Private functions */
237
238/**
239 * _fetch_next_ocp_if - return the next OCP interface in a list
240 * @p: ptr to a ptr to the list_head inside the ocp_if to return
241 * @i: pointer to the index of the element pointed to by @p in the list
242 *
243 * Return a pointer to the struct omap_hwmod_ocp_if record
244 * containing the struct list_head pointed to by @p, and increment
245 * @p such that a future call to this routine will return the next
246 * record.
247 */
248static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
249 int *i)
250{
251 struct omap_hwmod_ocp_if *oi;
252
253 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
254 *p = (*p)->next;
255
256 *i = *i + 1;
257
258 return oi;
259}
260
261/**
262 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
263 * @oh: struct omap_hwmod *
264 *
265 * Load the current value of the hwmod OCP_SYSCONFIG register into the
266 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
267 * OCP_SYSCONFIG register or 0 upon success.
268 */
269static int _update_sysc_cache(struct omap_hwmod *oh)
270{
271 if (!oh->class->sysc) {
272 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
273 return -EINVAL;
274 }
275
276 /* XXX ensure module interface clock is up */
277
278 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
279
280 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
281 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
282
283 return 0;
284}
285
286/**
287 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
288 * @v: OCP_SYSCONFIG value to write
289 * @oh: struct omap_hwmod *
290 *
291 * Write @v into the module class' OCP_SYSCONFIG register, if it has
292 * one. No return value.
293 */
294static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
295{
296 if (!oh->class->sysc) {
297 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
298 return;
299 }
300
301 /* XXX ensure module interface clock is up */
302
303 /* Module might have lost context, always update cache and register */
304 oh->_sysc_cache = v;
305
306 /*
307 * Some IP blocks (such as RTC) require unlocking of IP before
308 * accessing its registers. If a function pointer is present
309 * to unlock, then call it before accessing sysconfig and
310 * call lock after writing sysconfig.
311 */
312 if (oh->class->unlock)
313 oh->class->unlock(oh);
314
315 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
316
317 if (oh->class->lock)
318 oh->class->lock(oh);
319}
320
321/**
322 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
323 * @oh: struct omap_hwmod *
324 * @standbymode: MIDLEMODE field bits
325 * @v: pointer to register contents to modify
326 *
327 * Update the master standby mode bits in @v to be @standbymode for
328 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
329 * upon error or 0 upon success.
330 */
331static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
332 u32 *v)
333{
334 u32 mstandby_mask;
335 u8 mstandby_shift;
336
337 if (!oh->class->sysc ||
338 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
339 return -EINVAL;
340
341 if (!oh->class->sysc->sysc_fields) {
342 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
343 return -EINVAL;
344 }
345
346 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
347 mstandby_mask = (0x3 << mstandby_shift);
348
349 *v &= ~mstandby_mask;
350 *v |= __ffs(standbymode) << mstandby_shift;
351
352 return 0;
353}
354
355/**
356 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
357 * @oh: struct omap_hwmod *
358 * @idlemode: SIDLEMODE field bits
359 * @v: pointer to register contents to modify
360 *
361 * Update the slave idle mode bits in @v to be @idlemode for the @oh
362 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
363 * or 0 upon success.
364 */
365static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
366{
367 u32 sidle_mask;
368 u8 sidle_shift;
369
370 if (!oh->class->sysc ||
371 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
372 return -EINVAL;
373
374 if (!oh->class->sysc->sysc_fields) {
375 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
376 return -EINVAL;
377 }
378
379 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
380 sidle_mask = (0x3 << sidle_shift);
381
382 *v &= ~sidle_mask;
383 *v |= __ffs(idlemode) << sidle_shift;
384
385 return 0;
386}
387
388/**
389 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
390 * @oh: struct omap_hwmod *
391 * @clockact: CLOCKACTIVITY field bits
392 * @v: pointer to register contents to modify
393 *
394 * Update the clockactivity mode bits in @v to be @clockact for the
395 * @oh hwmod. Used for additional powersaving on some modules. Does
396 * not write to the hardware. Returns -EINVAL upon error or 0 upon
397 * success.
398 */
399static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
400{
401 u32 clkact_mask;
402 u8 clkact_shift;
403
404 if (!oh->class->sysc ||
405 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
406 return -EINVAL;
407
408 if (!oh->class->sysc->sysc_fields) {
409 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
410 return -EINVAL;
411 }
412
413 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
414 clkact_mask = (0x3 << clkact_shift);
415
416 *v &= ~clkact_mask;
417 *v |= clockact << clkact_shift;
418
419 return 0;
420}
421
422/**
423 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
424 * @oh: struct omap_hwmod *
425 * @v: pointer to register contents to modify
426 *
427 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
428 * error or 0 upon success.
429 */
430static int _set_softreset(struct omap_hwmod *oh, u32 *v)
431{
432 u32 softrst_mask;
433
434 if (!oh->class->sysc ||
435 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
436 return -EINVAL;
437
438 if (!oh->class->sysc->sysc_fields) {
439 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
440 return -EINVAL;
441 }
442
443 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
444
445 *v |= softrst_mask;
446
447 return 0;
448}
449
450/**
451 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
452 * @oh: struct omap_hwmod *
453 * @v: pointer to register contents to modify
454 *
455 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
456 * error or 0 upon success.
457 */
458static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
459{
460 u32 softrst_mask;
461
462 if (!oh->class->sysc ||
463 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
464 return -EINVAL;
465
466 if (!oh->class->sysc->sysc_fields) {
467 WARN(1,
468 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
469 oh->name);
470 return -EINVAL;
471 }
472
473 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
474
475 *v &= ~softrst_mask;
476
477 return 0;
478}
479
480/**
481 * _wait_softreset_complete - wait for an OCP softreset to complete
482 * @oh: struct omap_hwmod * to wait on
483 *
484 * Wait until the IP block represented by @oh reports that its OCP
485 * softreset is complete. This can be triggered by software (see
486 * _ocp_softreset()) or by hardware upon returning from off-mode (one
487 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
488 * microseconds. Returns the number of microseconds waited.
489 */
490static int _wait_softreset_complete(struct omap_hwmod *oh)
491{
492 struct omap_hwmod_class_sysconfig *sysc;
493 u32 softrst_mask;
494 int c = 0;
495
496 sysc = oh->class->sysc;
497
498 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
499 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
500 & SYSS_RESETDONE_MASK),
501 MAX_MODULE_SOFTRESET_WAIT, c);
502 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
503 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
504 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
505 & softrst_mask),
506 MAX_MODULE_SOFTRESET_WAIT, c);
507 }
508
509 return c;
510}
511
512/**
513 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
514 * @oh: struct omap_hwmod *
515 *
516 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
517 * of some modules. When the DMA must perform read/write accesses, the
518 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
519 * for power management, software must set the DMADISABLE bit back to 1.
520 *
521 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
522 * error or 0 upon success.
523 */
524static int _set_dmadisable(struct omap_hwmod *oh)
525{
526 u32 v;
527 u32 dmadisable_mask;
528
529 if (!oh->class->sysc ||
530 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
531 return -EINVAL;
532
533 if (!oh->class->sysc->sysc_fields) {
534 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
535 return -EINVAL;
536 }
537
538 /* clocks must be on for this operation */
539 if (oh->_state != _HWMOD_STATE_ENABLED) {
540 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
541 return -EINVAL;
542 }
543
544 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
545
546 v = oh->_sysc_cache;
547 dmadisable_mask =
548 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
549 v |= dmadisable_mask;
550 _write_sysconfig(v, oh);
551
552 return 0;
553}
554
555/**
556 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
557 * @oh: struct omap_hwmod *
558 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
559 * @v: pointer to register contents to modify
560 *
561 * Update the module autoidle bit in @v to be @autoidle for the @oh
562 * hwmod. The autoidle bit controls whether the module can gate
563 * internal clocks automatically when it isn't doing anything; the
564 * exact function of this bit varies on a per-module basis. This
565 * function does not write to the hardware. Returns -EINVAL upon
566 * error or 0 upon success.
567 */
568static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
569 u32 *v)
570{
571 u32 autoidle_mask;
572 u8 autoidle_shift;
573
574 if (!oh->class->sysc ||
575 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
576 return -EINVAL;
577
578 if (!oh->class->sysc->sysc_fields) {
579 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
580 return -EINVAL;
581 }
582
583 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
584 autoidle_mask = (0x1 << autoidle_shift);
585
586 *v &= ~autoidle_mask;
587 *v |= autoidle << autoidle_shift;
588
589 return 0;
590}
591
592/**
593 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
594 * @oh: struct omap_hwmod *
595 *
596 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
597 * upon error or 0 upon success.
598 */
599static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
600{
601 if (!oh->class->sysc ||
602 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
603 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
604 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
605 return -EINVAL;
606
607 if (!oh->class->sysc->sysc_fields) {
608 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
609 return -EINVAL;
610 }
611
612 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
613 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
614
615 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
616 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
617 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
618 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
619
620 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
621
622 return 0;
623}
624
625/**
626 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
627 * @oh: struct omap_hwmod *
628 *
629 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
630 * upon error or 0 upon success.
631 */
632static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
633{
634 if (!oh->class->sysc ||
635 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
636 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
637 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
638 return -EINVAL;
639
640 if (!oh->class->sysc->sysc_fields) {
641 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
642 return -EINVAL;
643 }
644
645 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
646 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
647
648 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
649 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
650 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
651 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
652
653 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
654
655 return 0;
656}
657
658static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
659{
660 struct clk_hw_omap *clk;
661
662 if (oh->clkdm) {
663 return oh->clkdm;
664 } else if (oh->_clk) {
665 if (__clk_get_flags(oh->_clk) & CLK_IS_BASIC)
666 return NULL;
667 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
668 return clk->clkdm;
669 }
670 return NULL;
671}
672
673/**
674 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
675 * @oh: struct omap_hwmod *
676 *
677 * Prevent the hardware module @oh from entering idle while the
678 * hardare module initiator @init_oh is active. Useful when a module
679 * will be accessed by a particular initiator (e.g., if a module will
680 * be accessed by the IVA, there should be a sleepdep between the IVA
681 * initiator and the module). Only applies to modules in smart-idle
682 * mode. If the clockdomain is marked as not needing autodeps, return
683 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
684 * passes along clkdm_add_sleepdep() value upon success.
685 */
686static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
687{
688 struct clockdomain *clkdm, *init_clkdm;
689
690 clkdm = _get_clkdm(oh);
691 init_clkdm = _get_clkdm(init_oh);
692
693 if (!clkdm || !init_clkdm)
694 return -EINVAL;
695
696 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
697 return 0;
698
699 return clkdm_add_sleepdep(clkdm, init_clkdm);
700}
701
702/**
703 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
704 * @oh: struct omap_hwmod *
705 *
706 * Allow the hardware module @oh to enter idle while the hardare
707 * module initiator @init_oh is active. Useful when a module will not
708 * be accessed by a particular initiator (e.g., if a module will not
709 * be accessed by the IVA, there should be no sleepdep between the IVA
710 * initiator and the module). Only applies to modules in smart-idle
711 * mode. If the clockdomain is marked as not needing autodeps, return
712 * 0 without doing anything. Returns -EINVAL upon error or passes
713 * along clkdm_del_sleepdep() value upon success.
714 */
715static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
716{
717 struct clockdomain *clkdm, *init_clkdm;
718
719 clkdm = _get_clkdm(oh);
720 init_clkdm = _get_clkdm(init_oh);
721
722 if (!clkdm || !init_clkdm)
723 return -EINVAL;
724
725 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
726 return 0;
727
728 return clkdm_del_sleepdep(clkdm, init_clkdm);
729}
730
731/**
732 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
733 * @oh: struct omap_hwmod *
734 *
735 * Called from _init_clocks(). Populates the @oh _clk (main
736 * functional clock pointer) if a clock matching the hwmod name is found,
737 * or a main_clk is present. Returns 0 on success or -EINVAL on error.
738 */
739static int _init_main_clk(struct omap_hwmod *oh)
740{
741 int ret = 0;
742 char name[MOD_CLK_MAX_NAME_LEN];
743 struct clk *clk;
744 static const char modck[] = "_mod_ck";
745
746 if (strlen(oh->name) >= MOD_CLK_MAX_NAME_LEN - strlen(modck))
747 pr_warn("%s: warning: cropping name for %s\n", __func__,
748 oh->name);
749
750 strlcpy(name, oh->name, MOD_CLK_MAX_NAME_LEN - strlen(modck));
751 strlcat(name, modck, MOD_CLK_MAX_NAME_LEN);
752
753 clk = clk_get(NULL, name);
754 if (!IS_ERR(clk)) {
755 oh->_clk = clk;
756 soc_ops.disable_direct_prcm(oh);
757 oh->main_clk = kstrdup(name, GFP_KERNEL);
758 } else {
759 if (!oh->main_clk)
760 return 0;
761
762 oh->_clk = clk_get(NULL, oh->main_clk);
763 }
764
765 if (IS_ERR(oh->_clk)) {
766 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
767 oh->name, oh->main_clk);
768 return -EINVAL;
769 }
770 /*
771 * HACK: This needs a re-visit once clk_prepare() is implemented
772 * to do something meaningful. Today its just a no-op.
773 * If clk_prepare() is used at some point to do things like
774 * voltage scaling etc, then this would have to be moved to
775 * some point where subsystems like i2c and pmic become
776 * available.
777 */
778 clk_prepare(oh->_clk);
779
780 if (!_get_clkdm(oh))
781 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
782 oh->name, oh->main_clk);
783
784 return ret;
785}
786
787/**
788 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
789 * @oh: struct omap_hwmod *
790 *
791 * Called from _init_clocks(). Populates the @oh OCP slave interface
792 * clock pointers. Returns 0 on success or -EINVAL on error.
793 */
794static int _init_interface_clks(struct omap_hwmod *oh)
795{
796 struct omap_hwmod_ocp_if *os;
797 struct list_head *p;
798 struct clk *c;
799 int i = 0;
800 int ret = 0;
801
802 p = oh->slave_ports.next;
803
804 while (i < oh->slaves_cnt) {
805 os = _fetch_next_ocp_if(&p, &i);
806 if (!os->clk)
807 continue;
808
809 c = clk_get(NULL, os->clk);
810 if (IS_ERR(c)) {
811 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
812 oh->name, os->clk);
813 ret = -EINVAL;
814 continue;
815 }
816 os->_clk = c;
817 /*
818 * HACK: This needs a re-visit once clk_prepare() is implemented
819 * to do something meaningful. Today its just a no-op.
820 * If clk_prepare() is used at some point to do things like
821 * voltage scaling etc, then this would have to be moved to
822 * some point where subsystems like i2c and pmic become
823 * available.
824 */
825 clk_prepare(os->_clk);
826 }
827
828 return ret;
829}
830
831/**
832 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
833 * @oh: struct omap_hwmod *
834 *
835 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
836 * clock pointers. Returns 0 on success or -EINVAL on error.
837 */
838static int _init_opt_clks(struct omap_hwmod *oh)
839{
840 struct omap_hwmod_opt_clk *oc;
841 struct clk *c;
842 int i;
843 int ret = 0;
844
845 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
846 c = clk_get(NULL, oc->clk);
847 if (IS_ERR(c)) {
848 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
849 oh->name, oc->clk);
850 ret = -EINVAL;
851 continue;
852 }
853 oc->_clk = c;
854 /*
855 * HACK: This needs a re-visit once clk_prepare() is implemented
856 * to do something meaningful. Today its just a no-op.
857 * If clk_prepare() is used at some point to do things like
858 * voltage scaling etc, then this would have to be moved to
859 * some point where subsystems like i2c and pmic become
860 * available.
861 */
862 clk_prepare(oc->_clk);
863 }
864
865 return ret;
866}
867
868static void _enable_optional_clocks(struct omap_hwmod *oh)
869{
870 struct omap_hwmod_opt_clk *oc;
871 int i;
872
873 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
874
875 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
876 if (oc->_clk) {
877 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
878 __clk_get_name(oc->_clk));
879 clk_enable(oc->_clk);
880 }
881}
882
883static void _disable_optional_clocks(struct omap_hwmod *oh)
884{
885 struct omap_hwmod_opt_clk *oc;
886 int i;
887
888 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
889
890 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
891 if (oc->_clk) {
892 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
893 __clk_get_name(oc->_clk));
894 clk_disable(oc->_clk);
895 }
896}
897
898/**
899 * _enable_clocks - enable hwmod main clock and interface clocks
900 * @oh: struct omap_hwmod *
901 *
902 * Enables all clocks necessary for register reads and writes to succeed
903 * on the hwmod @oh. Returns 0.
904 */
905static int _enable_clocks(struct omap_hwmod *oh)
906{
907 struct omap_hwmod_ocp_if *os;
908 struct list_head *p;
909 int i = 0;
910
911 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
912
913 if (oh->_clk)
914 clk_enable(oh->_clk);
915
916 p = oh->slave_ports.next;
917
918 while (i < oh->slaves_cnt) {
919 os = _fetch_next_ocp_if(&p, &i);
920
921 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
922 clk_enable(os->_clk);
923 }
924
925 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
926 _enable_optional_clocks(oh);
927
928 /* The opt clocks are controlled by the device driver. */
929
930 return 0;
931}
932
933/**
934 * _disable_clocks - disable hwmod main clock and interface clocks
935 * @oh: struct omap_hwmod *
936 *
937 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
938 */
939static int _disable_clocks(struct omap_hwmod *oh)
940{
941 struct omap_hwmod_ocp_if *os;
942 struct list_head *p;
943 int i = 0;
944
945 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
946
947 if (oh->_clk)
948 clk_disable(oh->_clk);
949
950 p = oh->slave_ports.next;
951
952 while (i < oh->slaves_cnt) {
953 os = _fetch_next_ocp_if(&p, &i);
954
955 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
956 clk_disable(os->_clk);
957 }
958
959 if (oh->flags & HWMOD_OPT_CLKS_NEEDED)
960 _disable_optional_clocks(oh);
961
962 /* The opt clocks are controlled by the device driver. */
963
964 return 0;
965}
966
967/**
968 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
969 * @oh: struct omap_hwmod *
970 *
971 * Enables the PRCM module mode related to the hwmod @oh.
972 * No return value.
973 */
974static void _omap4_enable_module(struct omap_hwmod *oh)
975{
976 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
977 return;
978
979 pr_debug("omap_hwmod: %s: %s: %d\n",
980 oh->name, __func__, oh->prcm.omap4.modulemode);
981
982 omap_cm_module_enable(oh->prcm.omap4.modulemode,
983 oh->clkdm->prcm_partition,
984 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
985}
986
987/**
988 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
989 * @oh: struct omap_hwmod *
990 *
991 * Wait for a module @oh to enter slave idle. Returns 0 if the module
992 * does not have an IDLEST bit or if the module successfully enters
993 * slave idle; otherwise, pass along the return value of the
994 * appropriate *_cm*_wait_module_idle() function.
995 */
996static int _omap4_wait_target_disable(struct omap_hwmod *oh)
997{
998 if (!oh)
999 return -EINVAL;
1000
1001 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1002 return 0;
1003
1004 if (oh->flags & HWMOD_NO_IDLEST)
1005 return 0;
1006
1007 if (!oh->prcm.omap4.clkctrl_offs &&
1008 !(oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET))
1009 return 0;
1010
1011 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1012 oh->clkdm->cm_inst,
1013 oh->prcm.omap4.clkctrl_offs, 0);
1014}
1015
1016/**
1017 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1018 * @oh: struct omap_hwmod *oh
1019 *
1020 * Count and return the number of MPU IRQs associated with the hwmod
1021 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1022 * NULL.
1023 */
1024static int _count_mpu_irqs(struct omap_hwmod *oh)
1025{
1026 struct omap_hwmod_irq_info *ohii;
1027 int i = 0;
1028
1029 if (!oh || !oh->mpu_irqs)
1030 return 0;
1031
1032 do {
1033 ohii = &oh->mpu_irqs[i++];
1034 } while (ohii->irq != -1);
1035
1036 return i-1;
1037}
1038
1039/**
1040 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1041 * @oh: struct omap_hwmod *oh
1042 *
1043 * Count and return the number of SDMA request lines associated with
1044 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1045 * if @oh is NULL.
1046 */
1047static int _count_sdma_reqs(struct omap_hwmod *oh)
1048{
1049 struct omap_hwmod_dma_info *ohdi;
1050 int i = 0;
1051
1052 if (!oh || !oh->sdma_reqs)
1053 return 0;
1054
1055 do {
1056 ohdi = &oh->sdma_reqs[i++];
1057 } while (ohdi->dma_req != -1);
1058
1059 return i-1;
1060}
1061
1062/**
1063 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1064 * @oh: struct omap_hwmod *oh
1065 *
1066 * Count and return the number of address space ranges associated with
1067 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1068 * if @oh is NULL.
1069 */
1070static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1071{
1072 struct omap_hwmod_addr_space *mem;
1073 int i = 0;
1074
1075 if (!os || !os->addr)
1076 return 0;
1077
1078 do {
1079 mem = &os->addr[i++];
1080 } while (mem->pa_start != mem->pa_end);
1081
1082 return i-1;
1083}
1084
1085/**
1086 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1087 * @oh: struct omap_hwmod * to operate on
1088 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1089 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1090 *
1091 * Retrieve a MPU hardware IRQ line number named by @name associated
1092 * with the IP block pointed to by @oh. The IRQ number will be filled
1093 * into the address pointed to by @dma. When @name is non-null, the
1094 * IRQ line number associated with the named entry will be returned.
1095 * If @name is null, the first matching entry will be returned. Data
1096 * order is not meaningful in hwmod data, so callers are strongly
1097 * encouraged to use a non-null @name whenever possible to avoid
1098 * unpredictable effects if hwmod data is later added that causes data
1099 * ordering to change. Returns 0 upon success or a negative error
1100 * code upon error.
1101 */
1102static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1103 unsigned int *irq)
1104{
1105 int i;
1106 bool found = false;
1107
1108 if (!oh->mpu_irqs)
1109 return -ENOENT;
1110
1111 i = 0;
1112 while (oh->mpu_irqs[i].irq != -1) {
1113 if (name == oh->mpu_irqs[i].name ||
1114 !strcmp(name, oh->mpu_irqs[i].name)) {
1115 found = true;
1116 break;
1117 }
1118 i++;
1119 }
1120
1121 if (!found)
1122 return -ENOENT;
1123
1124 *irq = oh->mpu_irqs[i].irq;
1125
1126 return 0;
1127}
1128
1129/**
1130 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1131 * @oh: struct omap_hwmod * to operate on
1132 * @name: pointer to the name of the SDMA request line to fetch (optional)
1133 * @dma: pointer to an unsigned int to store the request line ID to
1134 *
1135 * Retrieve an SDMA request line ID named by @name on the IP block
1136 * pointed to by @oh. The ID will be filled into the address pointed
1137 * to by @dma. When @name is non-null, the request line ID associated
1138 * with the named entry will be returned. If @name is null, the first
1139 * matching entry will be returned. Data order is not meaningful in
1140 * hwmod data, so callers are strongly encouraged to use a non-null
1141 * @name whenever possible to avoid unpredictable effects if hwmod
1142 * data is later added that causes data ordering to change. Returns 0
1143 * upon success or a negative error code upon error.
1144 */
1145static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1146 unsigned int *dma)
1147{
1148 int i;
1149 bool found = false;
1150
1151 if (!oh->sdma_reqs)
1152 return -ENOENT;
1153
1154 i = 0;
1155 while (oh->sdma_reqs[i].dma_req != -1) {
1156 if (name == oh->sdma_reqs[i].name ||
1157 !strcmp(name, oh->sdma_reqs[i].name)) {
1158 found = true;
1159 break;
1160 }
1161 i++;
1162 }
1163
1164 if (!found)
1165 return -ENOENT;
1166
1167 *dma = oh->sdma_reqs[i].dma_req;
1168
1169 return 0;
1170}
1171
1172/**
1173 * _get_addr_space_by_name - fetch address space start & end by name
1174 * @oh: struct omap_hwmod * to operate on
1175 * @name: pointer to the name of the address space to fetch (optional)
1176 * @pa_start: pointer to a u32 to store the starting address to
1177 * @pa_end: pointer to a u32 to store the ending address to
1178 *
1179 * Retrieve address space start and end addresses for the IP block
1180 * pointed to by @oh. The data will be filled into the addresses
1181 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1182 * address space data associated with the named entry will be
1183 * returned. If @name is null, the first matching entry will be
1184 * returned. Data order is not meaningful in hwmod data, so callers
1185 * are strongly encouraged to use a non-null @name whenever possible
1186 * to avoid unpredictable effects if hwmod data is later added that
1187 * causes data ordering to change. Returns 0 upon success or a
1188 * negative error code upon error.
1189 */
1190static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1191 u32 *pa_start, u32 *pa_end)
1192{
1193 int i, j;
1194 struct omap_hwmod_ocp_if *os;
1195 struct list_head *p = NULL;
1196 bool found = false;
1197
1198 p = oh->slave_ports.next;
1199
1200 i = 0;
1201 while (i < oh->slaves_cnt) {
1202 os = _fetch_next_ocp_if(&p, &i);
1203
1204 if (!os->addr)
1205 return -ENOENT;
1206
1207 j = 0;
1208 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1209 if (name == os->addr[j].name ||
1210 !strcmp(name, os->addr[j].name)) {
1211 found = true;
1212 break;
1213 }
1214 j++;
1215 }
1216
1217 if (found)
1218 break;
1219 }
1220
1221 if (!found)
1222 return -ENOENT;
1223
1224 *pa_start = os->addr[j].pa_start;
1225 *pa_end = os->addr[j].pa_end;
1226
1227 return 0;
1228}
1229
1230/**
1231 * _save_mpu_port_index - find and save the index to @oh's MPU port
1232 * @oh: struct omap_hwmod *
1233 *
1234 * Determines the array index of the OCP slave port that the MPU uses
1235 * to address the device, and saves it into the struct omap_hwmod.
1236 * Intended to be called during hwmod registration only. No return
1237 * value.
1238 */
1239static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1240{
1241 struct omap_hwmod_ocp_if *os = NULL;
1242 struct list_head *p;
1243 int i = 0;
1244
1245 if (!oh)
1246 return;
1247
1248 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1249
1250 p = oh->slave_ports.next;
1251
1252 while (i < oh->slaves_cnt) {
1253 os = _fetch_next_ocp_if(&p, &i);
1254 if (os->user & OCP_USER_MPU) {
1255 oh->_mpu_port = os;
1256 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1257 break;
1258 }
1259 }
1260
1261 return;
1262}
1263
1264/**
1265 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1266 * @oh: struct omap_hwmod *
1267 *
1268 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1269 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1270 * communicate with the IP block. This interface need not be directly
1271 * connected to the MPU (and almost certainly is not), but is directly
1272 * connected to the IP block represented by @oh. Returns a pointer
1273 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1274 * error or if there does not appear to be a path from the MPU to this
1275 * IP block.
1276 */
1277static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1278{
1279 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1280 return NULL;
1281
1282 return oh->_mpu_port;
1283};
1284
1285/**
1286 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1287 * @oh: struct omap_hwmod *
1288 *
1289 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1290 * the register target MPU address space; or returns NULL upon error.
1291 */
1292static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1293{
1294 struct omap_hwmod_ocp_if *os;
1295 struct omap_hwmod_addr_space *mem;
1296 int found = 0, i = 0;
1297
1298 os = _find_mpu_rt_port(oh);
1299 if (!os || !os->addr)
1300 return NULL;
1301
1302 do {
1303 mem = &os->addr[i++];
1304 if (mem->flags & ADDR_TYPE_RT)
1305 found = 1;
1306 } while (!found && mem->pa_start != mem->pa_end);
1307
1308 return (found) ? mem : NULL;
1309}
1310
1311/**
1312 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1313 * @oh: struct omap_hwmod *
1314 *
1315 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1316 * by @oh is set to indicate to the PRCM that the IP block is active.
1317 * Usually this means placing the module into smart-idle mode and
1318 * smart-standby, but if there is a bug in the automatic idle handling
1319 * for the IP block, it may need to be placed into the force-idle or
1320 * no-idle variants of these modes. No return value.
1321 */
1322static void _enable_sysc(struct omap_hwmod *oh)
1323{
1324 u8 idlemode, sf;
1325 u32 v;
1326 bool clkdm_act;
1327 struct clockdomain *clkdm;
1328
1329 if (!oh->class->sysc)
1330 return;
1331
1332 /*
1333 * Wait until reset has completed, this is needed as the IP
1334 * block is reset automatically by hardware in some cases
1335 * (off-mode for example), and the drivers require the
1336 * IP to be ready when they access it
1337 */
1338 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1339 _enable_optional_clocks(oh);
1340 _wait_softreset_complete(oh);
1341 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1342 _disable_optional_clocks(oh);
1343
1344 v = oh->_sysc_cache;
1345 sf = oh->class->sysc->sysc_flags;
1346
1347 clkdm = _get_clkdm(oh);
1348 if (sf & SYSC_HAS_SIDLEMODE) {
1349 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1350 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1351 idlemode = HWMOD_IDLEMODE_NO;
1352 } else {
1353 if (sf & SYSC_HAS_ENAWAKEUP)
1354 _enable_wakeup(oh, &v);
1355 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1356 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1357 else
1358 idlemode = HWMOD_IDLEMODE_SMART;
1359 }
1360
1361 /*
1362 * This is special handling for some IPs like
1363 * 32k sync timer. Force them to idle!
1364 */
1365 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1366 if (clkdm_act && !(oh->class->sysc->idlemodes &
1367 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1368 idlemode = HWMOD_IDLEMODE_FORCE;
1369
1370 _set_slave_idlemode(oh, idlemode, &v);
1371 }
1372
1373 if (sf & SYSC_HAS_MIDLEMODE) {
1374 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1375 idlemode = HWMOD_IDLEMODE_FORCE;
1376 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1377 idlemode = HWMOD_IDLEMODE_NO;
1378 } else {
1379 if (sf & SYSC_HAS_ENAWAKEUP)
1380 _enable_wakeup(oh, &v);
1381 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1382 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1383 else
1384 idlemode = HWMOD_IDLEMODE_SMART;
1385 }
1386 _set_master_standbymode(oh, idlemode, &v);
1387 }
1388
1389 /*
1390 * XXX The clock framework should handle this, by
1391 * calling into this code. But this must wait until the
1392 * clock structures are tagged with omap_hwmod entries
1393 */
1394 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1395 (sf & SYSC_HAS_CLOCKACTIVITY))
1396 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1397
1398 _write_sysconfig(v, oh);
1399
1400 /*
1401 * Set the autoidle bit only after setting the smartidle bit
1402 * Setting this will not have any impact on the other modules.
1403 */
1404 if (sf & SYSC_HAS_AUTOIDLE) {
1405 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1406 0 : 1;
1407 _set_module_autoidle(oh, idlemode, &v);
1408 _write_sysconfig(v, oh);
1409 }
1410}
1411
1412/**
1413 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1414 * @oh: struct omap_hwmod *
1415 *
1416 * If module is marked as SWSUP_SIDLE, force the module into slave
1417 * idle; otherwise, configure it for smart-idle. If module is marked
1418 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1419 * configure it for smart-standby. No return value.
1420 */
1421static void _idle_sysc(struct omap_hwmod *oh)
1422{
1423 u8 idlemode, sf;
1424 u32 v;
1425
1426 if (!oh->class->sysc)
1427 return;
1428
1429 v = oh->_sysc_cache;
1430 sf = oh->class->sysc->sysc_flags;
1431
1432 if (sf & SYSC_HAS_SIDLEMODE) {
1433 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1434 idlemode = HWMOD_IDLEMODE_FORCE;
1435 } else {
1436 if (sf & SYSC_HAS_ENAWAKEUP)
1437 _enable_wakeup(oh, &v);
1438 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1439 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1440 else
1441 idlemode = HWMOD_IDLEMODE_SMART;
1442 }
1443 _set_slave_idlemode(oh, idlemode, &v);
1444 }
1445
1446 if (sf & SYSC_HAS_MIDLEMODE) {
1447 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1448 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1449 idlemode = HWMOD_IDLEMODE_FORCE;
1450 } else {
1451 if (sf & SYSC_HAS_ENAWAKEUP)
1452 _enable_wakeup(oh, &v);
1453 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1454 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1455 else
1456 idlemode = HWMOD_IDLEMODE_SMART;
1457 }
1458 _set_master_standbymode(oh, idlemode, &v);
1459 }
1460
1461 /* If the cached value is the same as the new value, skip the write */
1462 if (oh->_sysc_cache != v)
1463 _write_sysconfig(v, oh);
1464}
1465
1466/**
1467 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1468 * @oh: struct omap_hwmod *
1469 *
1470 * Force the module into slave idle and master suspend. No return
1471 * value.
1472 */
1473static void _shutdown_sysc(struct omap_hwmod *oh)
1474{
1475 u32 v;
1476 u8 sf;
1477
1478 if (!oh->class->sysc)
1479 return;
1480
1481 v = oh->_sysc_cache;
1482 sf = oh->class->sysc->sysc_flags;
1483
1484 if (sf & SYSC_HAS_SIDLEMODE)
1485 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1486
1487 if (sf & SYSC_HAS_MIDLEMODE)
1488 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1489
1490 if (sf & SYSC_HAS_AUTOIDLE)
1491 _set_module_autoidle(oh, 1, &v);
1492
1493 _write_sysconfig(v, oh);
1494}
1495
1496/**
1497 * _lookup - find an omap_hwmod by name
1498 * @name: find an omap_hwmod by name
1499 *
1500 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1501 */
1502static struct omap_hwmod *_lookup(const char *name)
1503{
1504 struct omap_hwmod *oh, *temp_oh;
1505
1506 oh = NULL;
1507
1508 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1509 if (!strcmp(name, temp_oh->name)) {
1510 oh = temp_oh;
1511 break;
1512 }
1513 }
1514
1515 return oh;
1516}
1517
1518/**
1519 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1520 * @oh: struct omap_hwmod *
1521 *
1522 * Convert a clockdomain name stored in a struct omap_hwmod into a
1523 * clockdomain pointer, and save it into the struct omap_hwmod.
1524 * Return -EINVAL if the clkdm_name lookup failed.
1525 */
1526static int _init_clkdm(struct omap_hwmod *oh)
1527{
1528 if (!oh->clkdm_name) {
1529 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1530 return 0;
1531 }
1532
1533 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1534 if (!oh->clkdm) {
1535 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1536 oh->name, oh->clkdm_name);
1537 return 0;
1538 }
1539
1540 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1541 oh->name, oh->clkdm_name);
1542
1543 return 0;
1544}
1545
1546/**
1547 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1548 * well the clockdomain.
1549 * @oh: struct omap_hwmod *
1550 * @data: not used; pass NULL
1551 *
1552 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1553 * Resolves all clock names embedded in the hwmod. Returns 0 on
1554 * success, or a negative error code on failure.
1555 */
1556static int _init_clocks(struct omap_hwmod *oh, void *data)
1557{
1558 int ret = 0;
1559
1560 if (oh->_state != _HWMOD_STATE_REGISTERED)
1561 return 0;
1562
1563 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1564
1565 if (soc_ops.init_clkdm)
1566 ret |= soc_ops.init_clkdm(oh);
1567
1568 ret |= _init_main_clk(oh);
1569 ret |= _init_interface_clks(oh);
1570 ret |= _init_opt_clks(oh);
1571
1572 if (!ret)
1573 oh->_state = _HWMOD_STATE_CLKS_INITED;
1574 else
1575 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1576
1577 return ret;
1578}
1579
1580/**
1581 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1582 * @oh: struct omap_hwmod *
1583 * @name: name of the reset line in the context of this hwmod
1584 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1585 *
1586 * Return the bit position of the reset line that match the
1587 * input name. Return -ENOENT if not found.
1588 */
1589static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1590 struct omap_hwmod_rst_info *ohri)
1591{
1592 int i;
1593
1594 for (i = 0; i < oh->rst_lines_cnt; i++) {
1595 const char *rst_line = oh->rst_lines[i].name;
1596 if (!strcmp(rst_line, name)) {
1597 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1598 ohri->st_shift = oh->rst_lines[i].st_shift;
1599 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1600 oh->name, __func__, rst_line, ohri->rst_shift,
1601 ohri->st_shift);
1602
1603 return 0;
1604 }
1605 }
1606
1607 return -ENOENT;
1608}
1609
1610/**
1611 * _assert_hardreset - assert the HW reset line of submodules
1612 * contained in the hwmod module.
1613 * @oh: struct omap_hwmod *
1614 * @name: name of the reset line to lookup and assert
1615 *
1616 * Some IP like dsp, ipu or iva contain processor that require an HW
1617 * reset line to be assert / deassert in order to enable fully the IP.
1618 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1619 * asserting the hardreset line on the currently-booted SoC, or passes
1620 * along the return value from _lookup_hardreset() or the SoC's
1621 * assert_hardreset code.
1622 */
1623static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1624{
1625 struct omap_hwmod_rst_info ohri;
1626 int ret = -EINVAL;
1627
1628 if (!oh)
1629 return -EINVAL;
1630
1631 if (!soc_ops.assert_hardreset)
1632 return -ENOSYS;
1633
1634 ret = _lookup_hardreset(oh, name, &ohri);
1635 if (ret < 0)
1636 return ret;
1637
1638 ret = soc_ops.assert_hardreset(oh, &ohri);
1639
1640 return ret;
1641}
1642
1643/**
1644 * _deassert_hardreset - deassert the HW reset line of submodules contained
1645 * in the hwmod module.
1646 * @oh: struct omap_hwmod *
1647 * @name: name of the reset line to look up and deassert
1648 *
1649 * Some IP like dsp, ipu or iva contain processor that require an HW
1650 * reset line to be assert / deassert in order to enable fully the IP.
1651 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1652 * deasserting the hardreset line on the currently-booted SoC, or passes
1653 * along the return value from _lookup_hardreset() or the SoC's
1654 * deassert_hardreset code.
1655 */
1656static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1657{
1658 struct omap_hwmod_rst_info ohri;
1659 int ret = -EINVAL;
1660
1661 if (!oh)
1662 return -EINVAL;
1663
1664 if (!soc_ops.deassert_hardreset)
1665 return -ENOSYS;
1666
1667 ret = _lookup_hardreset(oh, name, &ohri);
1668 if (ret < 0)
1669 return ret;
1670
1671 if (oh->clkdm) {
1672 /*
1673 * A clockdomain must be in SW_SUP otherwise reset
1674 * might not be completed. The clockdomain can be set
1675 * in HW_AUTO only when the module become ready.
1676 */
1677 clkdm_deny_idle(oh->clkdm);
1678 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1679 if (ret) {
1680 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1681 oh->name, oh->clkdm->name, ret);
1682 return ret;
1683 }
1684 }
1685
1686 _enable_clocks(oh);
1687 if (soc_ops.enable_module)
1688 soc_ops.enable_module(oh);
1689
1690 ret = soc_ops.deassert_hardreset(oh, &ohri);
1691
1692 if (soc_ops.disable_module)
1693 soc_ops.disable_module(oh);
1694 _disable_clocks(oh);
1695
1696 if (ret == -EBUSY)
1697 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1698
1699 if (oh->clkdm) {
1700 /*
1701 * Set the clockdomain to HW_AUTO, assuming that the
1702 * previous state was HW_AUTO.
1703 */
1704 clkdm_allow_idle(oh->clkdm);
1705
1706 clkdm_hwmod_disable(oh->clkdm, oh);
1707 }
1708
1709 return ret;
1710}
1711
1712/**
1713 * _read_hardreset - read the HW reset line state of submodules
1714 * contained in the hwmod module
1715 * @oh: struct omap_hwmod *
1716 * @name: name of the reset line to look up and read
1717 *
1718 * Return the state of the reset line. Returns -EINVAL if @oh is
1719 * null, -ENOSYS if we have no way of reading the hardreset line
1720 * status on the currently-booted SoC, or passes along the return
1721 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1722 * code.
1723 */
1724static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1725{
1726 struct omap_hwmod_rst_info ohri;
1727 int ret = -EINVAL;
1728
1729 if (!oh)
1730 return -EINVAL;
1731
1732 if (!soc_ops.is_hardreset_asserted)
1733 return -ENOSYS;
1734
1735 ret = _lookup_hardreset(oh, name, &ohri);
1736 if (ret < 0)
1737 return ret;
1738
1739 return soc_ops.is_hardreset_asserted(oh, &ohri);
1740}
1741
1742/**
1743 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1744 * @oh: struct omap_hwmod *
1745 *
1746 * If all hardreset lines associated with @oh are asserted, then return true.
1747 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1748 * associated with @oh are asserted, then return false.
1749 * This function is used to avoid executing some parts of the IP block
1750 * enable/disable sequence if its hardreset line is set.
1751 */
1752static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1753{
1754 int i, rst_cnt = 0;
1755
1756 if (oh->rst_lines_cnt == 0)
1757 return false;
1758
1759 for (i = 0; i < oh->rst_lines_cnt; i++)
1760 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1761 rst_cnt++;
1762
1763 if (oh->rst_lines_cnt == rst_cnt)
1764 return true;
1765
1766 return false;
1767}
1768
1769/**
1770 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1771 * hard-reset
1772 * @oh: struct omap_hwmod *
1773 *
1774 * If any hardreset lines associated with @oh are asserted, then
1775 * return true. Otherwise, if no hardreset lines associated with @oh
1776 * are asserted, or if @oh has no hardreset lines, then return false.
1777 * This function is used to avoid executing some parts of the IP block
1778 * enable/disable sequence if any hardreset line is set.
1779 */
1780static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1781{
1782 int rst_cnt = 0;
1783 int i;
1784
1785 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1786 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1787 rst_cnt++;
1788
1789 return (rst_cnt) ? true : false;
1790}
1791
1792/**
1793 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1794 * @oh: struct omap_hwmod *
1795 *
1796 * Disable the PRCM module mode related to the hwmod @oh.
1797 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1798 */
1799static int _omap4_disable_module(struct omap_hwmod *oh)
1800{
1801 int v;
1802
1803 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1804 return -EINVAL;
1805
1806 /*
1807 * Since integration code might still be doing something, only
1808 * disable if all lines are under hardreset.
1809 */
1810 if (_are_any_hardreset_lines_asserted(oh))
1811 return 0;
1812
1813 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1814
1815 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1816 oh->prcm.omap4.clkctrl_offs);
1817
1818 v = _omap4_wait_target_disable(oh);
1819 if (v)
1820 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1821 oh->name);
1822
1823 return 0;
1824}
1825
1826/**
1827 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1828 * @oh: struct omap_hwmod *
1829 *
1830 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1831 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1832 * reset this way, -EINVAL if the hwmod is in the wrong state,
1833 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1834 *
1835 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1836 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1837 * use the SYSCONFIG softreset bit to provide the status.
1838 *
1839 * Note that some IP like McBSP do have reset control but don't have
1840 * reset status.
1841 */
1842static int _ocp_softreset(struct omap_hwmod *oh)
1843{
1844 u32 v;
1845 int c = 0;
1846 int ret = 0;
1847
1848 if (!oh->class->sysc ||
1849 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1850 return -ENOENT;
1851
1852 /* clocks must be on for this operation */
1853 if (oh->_state != _HWMOD_STATE_ENABLED) {
1854 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1855 oh->name);
1856 return -EINVAL;
1857 }
1858
1859 /* For some modules, all optionnal clocks need to be enabled as well */
1860 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1861 _enable_optional_clocks(oh);
1862
1863 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1864
1865 v = oh->_sysc_cache;
1866 ret = _set_softreset(oh, &v);
1867 if (ret)
1868 goto dis_opt_clks;
1869
1870 _write_sysconfig(v, oh);
1871
1872 if (oh->class->sysc->srst_udelay)
1873 udelay(oh->class->sysc->srst_udelay);
1874
1875 c = _wait_softreset_complete(oh);
1876 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1877 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1878 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1879 ret = -ETIMEDOUT;
1880 goto dis_opt_clks;
1881 } else {
1882 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1883 }
1884
1885 ret = _clear_softreset(oh, &v);
1886 if (ret)
1887 goto dis_opt_clks;
1888
1889 _write_sysconfig(v, oh);
1890
1891 /*
1892 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1893 * _wait_target_ready() or _reset()
1894 */
1895
1896dis_opt_clks:
1897 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1898 _disable_optional_clocks(oh);
1899
1900 return ret;
1901}
1902
1903/**
1904 * _reset - reset an omap_hwmod
1905 * @oh: struct omap_hwmod *
1906 *
1907 * Resets an omap_hwmod @oh. If the module has a custom reset
1908 * function pointer defined, then call it to reset the IP block, and
1909 * pass along its return value to the caller. Otherwise, if the IP
1910 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1911 * associated with it, call a function to reset the IP block via that
1912 * method, and pass along the return value to the caller. Finally, if
1913 * the IP block has some hardreset lines associated with it, assert
1914 * all of those, but do _not_ deassert them. (This is because driver
1915 * authors have expressed an apparent requirement to control the
1916 * deassertion of the hardreset lines themselves.)
1917 *
1918 * The default software reset mechanism for most OMAP IP blocks is
1919 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1920 * hwmods cannot be reset via this method. Some are not targets and
1921 * therefore have no OCP header registers to access. Others (like the
1922 * IVA) have idiosyncratic reset sequences. So for these relatively
1923 * rare cases, custom reset code can be supplied in the struct
1924 * omap_hwmod_class .reset function pointer.
1925 *
1926 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1927 * does not prevent idling of the system. This is necessary for cases
1928 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1929 * kernel without disabling dma.
1930 *
1931 * Passes along the return value from either _ocp_softreset() or the
1932 * custom reset function - these must return -EINVAL if the hwmod
1933 * cannot be reset this way or if the hwmod is in the wrong state,
1934 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1935 */
1936static int _reset(struct omap_hwmod *oh)
1937{
1938 int i, r;
1939
1940 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1941
1942 if (oh->class->reset) {
1943 r = oh->class->reset(oh);
1944 } else {
1945 if (oh->rst_lines_cnt > 0) {
1946 for (i = 0; i < oh->rst_lines_cnt; i++)
1947 _assert_hardreset(oh, oh->rst_lines[i].name);
1948 return 0;
1949 } else {
1950 r = _ocp_softreset(oh);
1951 if (r == -ENOENT)
1952 r = 0;
1953 }
1954 }
1955
1956 _set_dmadisable(oh);
1957
1958 /*
1959 * OCP_SYSCONFIG bits need to be reprogrammed after a
1960 * softreset. The _enable() function should be split to avoid
1961 * the rewrite of the OCP_SYSCONFIG register.
1962 */
1963 if (oh->class->sysc) {
1964 _update_sysc_cache(oh);
1965 _enable_sysc(oh);
1966 }
1967
1968 return r;
1969}
1970
1971/**
1972 * _omap4_update_context_lost - increment hwmod context loss counter if
1973 * hwmod context was lost, and clear hardware context loss reg
1974 * @oh: hwmod to check for context loss
1975 *
1976 * If the PRCM indicates that the hwmod @oh lost context, increment
1977 * our in-memory context loss counter, and clear the RM_*_CONTEXT
1978 * bits. No return value.
1979 */
1980static void _omap4_update_context_lost(struct omap_hwmod *oh)
1981{
1982 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
1983 return;
1984
1985 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1986 oh->clkdm->pwrdm.ptr->prcm_offs,
1987 oh->prcm.omap4.context_offs))
1988 return;
1989
1990 oh->prcm.omap4.context_lost_counter++;
1991 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
1992 oh->clkdm->pwrdm.ptr->prcm_offs,
1993 oh->prcm.omap4.context_offs);
1994}
1995
1996/**
1997 * _omap4_get_context_lost - get context loss counter for a hwmod
1998 * @oh: hwmod to get context loss counter for
1999 *
2000 * Returns the in-memory context loss counter for a hwmod.
2001 */
2002static int _omap4_get_context_lost(struct omap_hwmod *oh)
2003{
2004 return oh->prcm.omap4.context_lost_counter;
2005}
2006
2007/**
2008 * _enable_preprogram - Pre-program an IP block during the _enable() process
2009 * @oh: struct omap_hwmod *
2010 *
2011 * Some IP blocks (such as AESS) require some additional programming
2012 * after enable before they can enter idle. If a function pointer to
2013 * do so is present in the hwmod data, then call it and pass along the
2014 * return value; otherwise, return 0.
2015 */
2016static int _enable_preprogram(struct omap_hwmod *oh)
2017{
2018 if (!oh->class->enable_preprogram)
2019 return 0;
2020
2021 return oh->class->enable_preprogram(oh);
2022}
2023
2024/**
2025 * _enable - enable an omap_hwmod
2026 * @oh: struct omap_hwmod *
2027 *
2028 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2029 * register target. Returns -EINVAL if the hwmod is in the wrong
2030 * state or passes along the return value of _wait_target_ready().
2031 */
2032static int _enable(struct omap_hwmod *oh)
2033{
2034 int r;
2035
2036 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2037
2038 /*
2039 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2040 * state at init.
2041 */
2042 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2043 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2044 return 0;
2045 }
2046
2047 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2048 oh->_state != _HWMOD_STATE_IDLE &&
2049 oh->_state != _HWMOD_STATE_DISABLED) {
2050 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2051 oh->name);
2052 return -EINVAL;
2053 }
2054
2055 /*
2056 * If an IP block contains HW reset lines and all of them are
2057 * asserted, we let integration code associated with that
2058 * block handle the enable. We've received very little
2059 * information on what those driver authors need, and until
2060 * detailed information is provided and the driver code is
2061 * posted to the public lists, this is probably the best we
2062 * can do.
2063 */
2064 if (_are_all_hardreset_lines_asserted(oh))
2065 return 0;
2066
2067 _add_initiator_dep(oh, mpu_oh);
2068
2069 if (oh->clkdm) {
2070 /*
2071 * A clockdomain must be in SW_SUP before enabling
2072 * completely the module. The clockdomain can be set
2073 * in HW_AUTO only when the module become ready.
2074 */
2075 clkdm_deny_idle(oh->clkdm);
2076 r = clkdm_hwmod_enable(oh->clkdm, oh);
2077 if (r) {
2078 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2079 oh->name, oh->clkdm->name, r);
2080 return r;
2081 }
2082 }
2083
2084 _enable_clocks(oh);
2085 if (soc_ops.enable_module)
2086 soc_ops.enable_module(oh);
2087 if (oh->flags & HWMOD_BLOCK_WFI)
2088 cpu_idle_poll_ctrl(true);
2089
2090 if (soc_ops.update_context_lost)
2091 soc_ops.update_context_lost(oh);
2092
2093 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2094 -EINVAL;
2095 if (oh->clkdm)
2096 clkdm_allow_idle(oh->clkdm);
2097
2098 if (!r) {
2099 oh->_state = _HWMOD_STATE_ENABLED;
2100
2101 /* Access the sysconfig only if the target is ready */
2102 if (oh->class->sysc) {
2103 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2104 _update_sysc_cache(oh);
2105 _enable_sysc(oh);
2106 }
2107 r = _enable_preprogram(oh);
2108 } else {
2109 if (soc_ops.disable_module)
2110 soc_ops.disable_module(oh);
2111 _disable_clocks(oh);
2112 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
2113 oh->name, r);
2114
2115 if (oh->clkdm)
2116 clkdm_hwmod_disable(oh->clkdm, oh);
2117 }
2118
2119 return r;
2120}
2121
2122/**
2123 * _idle - idle an omap_hwmod
2124 * @oh: struct omap_hwmod *
2125 *
2126 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2127 * no further work. Returns -EINVAL if the hwmod is in the wrong
2128 * state or returns 0.
2129 */
2130static int _idle(struct omap_hwmod *oh)
2131{
2132 if (oh->flags & HWMOD_NO_IDLE) {
2133 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2134 return 0;
2135 }
2136
2137 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2138
2139 if (_are_all_hardreset_lines_asserted(oh))
2140 return 0;
2141
2142 if (oh->_state != _HWMOD_STATE_ENABLED) {
2143 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2144 oh->name);
2145 return -EINVAL;
2146 }
2147
2148 if (oh->class->sysc)
2149 _idle_sysc(oh);
2150 _del_initiator_dep(oh, mpu_oh);
2151
2152 if (oh->clkdm)
2153 clkdm_deny_idle(oh->clkdm);
2154
2155 if (oh->flags & HWMOD_BLOCK_WFI)
2156 cpu_idle_poll_ctrl(false);
2157 if (soc_ops.disable_module)
2158 soc_ops.disable_module(oh);
2159
2160 /*
2161 * The module must be in idle mode before disabling any parents
2162 * clocks. Otherwise, the parent clock might be disabled before
2163 * the module transition is done, and thus will prevent the
2164 * transition to complete properly.
2165 */
2166 _disable_clocks(oh);
2167 if (oh->clkdm) {
2168 clkdm_allow_idle(oh->clkdm);
2169 clkdm_hwmod_disable(oh->clkdm, oh);
2170 }
2171
2172 oh->_state = _HWMOD_STATE_IDLE;
2173
2174 return 0;
2175}
2176
2177/**
2178 * _shutdown - shutdown an omap_hwmod
2179 * @oh: struct omap_hwmod *
2180 *
2181 * Shut down an omap_hwmod @oh. This should be called when the driver
2182 * used for the hwmod is removed or unloaded or if the driver is not
2183 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2184 * state or returns 0.
2185 */
2186static int _shutdown(struct omap_hwmod *oh)
2187{
2188 int ret, i;
2189 u8 prev_state;
2190
2191 if (_are_all_hardreset_lines_asserted(oh))
2192 return 0;
2193
2194 if (oh->_state != _HWMOD_STATE_IDLE &&
2195 oh->_state != _HWMOD_STATE_ENABLED) {
2196 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2197 oh->name);
2198 return -EINVAL;
2199 }
2200
2201 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2202
2203 if (oh->class->pre_shutdown) {
2204 prev_state = oh->_state;
2205 if (oh->_state == _HWMOD_STATE_IDLE)
2206 _enable(oh);
2207 ret = oh->class->pre_shutdown(oh);
2208 if (ret) {
2209 if (prev_state == _HWMOD_STATE_IDLE)
2210 _idle(oh);
2211 return ret;
2212 }
2213 }
2214
2215 if (oh->class->sysc) {
2216 if (oh->_state == _HWMOD_STATE_IDLE)
2217 _enable(oh);
2218 _shutdown_sysc(oh);
2219 }
2220
2221 /* clocks and deps are already disabled in idle */
2222 if (oh->_state == _HWMOD_STATE_ENABLED) {
2223 _del_initiator_dep(oh, mpu_oh);
2224 /* XXX what about the other system initiators here? dma, dsp */
2225 if (oh->flags & HWMOD_BLOCK_WFI)
2226 cpu_idle_poll_ctrl(false);
2227 if (soc_ops.disable_module)
2228 soc_ops.disable_module(oh);
2229 _disable_clocks(oh);
2230 if (oh->clkdm)
2231 clkdm_hwmod_disable(oh->clkdm, oh);
2232 }
2233 /* XXX Should this code also force-disable the optional clocks? */
2234
2235 for (i = 0; i < oh->rst_lines_cnt; i++)
2236 _assert_hardreset(oh, oh->rst_lines[i].name);
2237
2238 oh->_state = _HWMOD_STATE_DISABLED;
2239
2240 return 0;
2241}
2242
2243static int of_dev_find_hwmod(struct device_node *np,
2244 struct omap_hwmod *oh)
2245{
2246 int count, i, res;
2247 const char *p;
2248
2249 count = of_property_count_strings(np, "ti,hwmods");
2250 if (count < 1)
2251 return -ENODEV;
2252
2253 for (i = 0; i < count; i++) {
2254 res = of_property_read_string_index(np, "ti,hwmods",
2255 i, &p);
2256 if (res)
2257 continue;
2258 if (!strcmp(p, oh->name)) {
2259 pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n",
2260 np->name, i, oh->name);
2261 return i;
2262 }
2263 }
2264
2265 return -ENODEV;
2266}
2267
2268/**
2269 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2270 * @np: struct device_node *
2271 * @oh: struct omap_hwmod *
2272 * @index: index of the entry found
2273 * @found: struct device_node * found or NULL
2274 *
2275 * Parse the dt blob and find out needed hwmod. Recursive function is
2276 * implemented to take care hierarchical dt blob parsing.
2277 * Return: Returns 0 on success, -ENODEV when not found.
2278 */
2279static int of_dev_hwmod_lookup(struct device_node *np,
2280 struct omap_hwmod *oh,
2281 int *index,
2282 struct device_node **found)
2283{
2284 struct device_node *np0 = NULL;
2285 int res;
2286
2287 res = of_dev_find_hwmod(np, oh);
2288 if (res >= 0) {
2289 *found = np;
2290 *index = res;
2291 return 0;
2292 }
2293
2294 for_each_child_of_node(np, np0) {
2295 struct device_node *fc;
2296 int i;
2297
2298 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2299 if (res == 0) {
2300 *found = fc;
2301 *index = i;
2302 return 0;
2303 }
2304 }
2305
2306 *found = NULL;
2307 *index = 0;
2308
2309 return -ENODEV;
2310}
2311
2312/**
2313 * _init_mpu_rt_base - populate the virtual address for a hwmod
2314 * @oh: struct omap_hwmod * to locate the virtual address
2315 * @data: (unused, caller should pass NULL)
2316 * @index: index of the reg entry iospace in device tree
2317 * @np: struct device_node * of the IP block's device node in the DT data
2318 *
2319 * Cache the virtual address used by the MPU to access this IP block's
2320 * registers. This address is needed early so the OCP registers that
2321 * are part of the device's address space can be ioremapped properly.
2322 *
2323 * If SYSC access is not needed, the registers will not be remapped
2324 * and non-availability of MPU access is not treated as an error.
2325 *
2326 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2327 * -ENXIO on absent or invalid register target address space.
2328 */
2329static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2330 int index, struct device_node *np)
2331{
2332 struct omap_hwmod_addr_space *mem;
2333 void __iomem *va_start = NULL;
2334
2335 if (!oh)
2336 return -EINVAL;
2337
2338 _save_mpu_port_index(oh);
2339
2340 /* if we don't need sysc access we don't need to ioremap */
2341 if (!oh->class->sysc)
2342 return 0;
2343
2344 /* we can't continue without MPU PORT if we need sysc access */
2345 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2346 return -ENXIO;
2347
2348 mem = _find_mpu_rt_addr_space(oh);
2349 if (!mem) {
2350 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2351 oh->name);
2352
2353 /* Extract the IO space from device tree blob */
2354 if (!np) {
2355 pr_err("omap_hwmod: %s: no dt node\n", oh->name);
2356 return -ENXIO;
2357 }
2358
2359 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2360 } else {
2361 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2362 }
2363
2364 if (!va_start) {
2365 if (mem)
2366 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2367 else
2368 pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n",
2369 oh->name, index, np->full_name);
2370 return -ENXIO;
2371 }
2372
2373 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2374 oh->name, va_start);
2375
2376 oh->_mpu_rt_va = va_start;
2377 return 0;
2378}
2379
2380/**
2381 * _init - initialize internal data for the hwmod @oh
2382 * @oh: struct omap_hwmod *
2383 * @n: (unused)
2384 *
2385 * Look up the clocks and the address space used by the MPU to access
2386 * registers belonging to the hwmod @oh. @oh must already be
2387 * registered at this point. This is the first of two phases for
2388 * hwmod initialization. Code called here does not touch any hardware
2389 * registers, it simply prepares internal data structures. Returns 0
2390 * upon success or if the hwmod isn't registered or if the hwmod's
2391 * address space is not defined, or -EINVAL upon failure.
2392 */
2393static int __init _init(struct omap_hwmod *oh, void *data)
2394{
2395 int r, index;
2396 struct device_node *np = NULL;
2397
2398 if (oh->_state != _HWMOD_STATE_REGISTERED)
2399 return 0;
2400
2401 if (of_have_populated_dt()) {
2402 struct device_node *bus;
2403
2404 bus = of_find_node_by_name(NULL, "ocp");
2405 if (!bus)
2406 return -ENODEV;
2407
2408 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2409 if (r)
2410 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2411 else if (np && index)
2412 pr_warn("omap_hwmod: %s using broken dt data from %s\n",
2413 oh->name, np->name);
2414 }
2415
2416 r = _init_mpu_rt_base(oh, NULL, index, np);
2417 if (r < 0) {
2418 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2419 oh->name);
2420 return 0;
2421 }
2422
2423 r = _init_clocks(oh, NULL);
2424 if (r < 0) {
2425 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2426 return -EINVAL;
2427 }
2428
2429 if (np) {
2430 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2431 oh->flags |= HWMOD_INIT_NO_RESET;
2432 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2433 oh->flags |= HWMOD_INIT_NO_IDLE;
2434 if (of_find_property(np, "ti,no-idle", NULL))
2435 oh->flags |= HWMOD_NO_IDLE;
2436 }
2437
2438 oh->_state = _HWMOD_STATE_INITIALIZED;
2439
2440 return 0;
2441}
2442
2443/**
2444 * _setup_iclk_autoidle - configure an IP block's interface clocks
2445 * @oh: struct omap_hwmod *
2446 *
2447 * Set up the module's interface clocks. XXX This function is still mostly
2448 * a stub; implementing this properly requires iclk autoidle usecounting in
2449 * the clock code. No return value.
2450 */
2451static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2452{
2453 struct omap_hwmod_ocp_if *os;
2454 struct list_head *p;
2455 int i = 0;
2456 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2457 return;
2458
2459 p = oh->slave_ports.next;
2460
2461 while (i < oh->slaves_cnt) {
2462 os = _fetch_next_ocp_if(&p, &i);
2463 if (!os->_clk)
2464 continue;
2465
2466 if (os->flags & OCPIF_SWSUP_IDLE) {
2467 /* XXX omap_iclk_deny_idle(c); */
2468 } else {
2469 /* XXX omap_iclk_allow_idle(c); */
2470 clk_enable(os->_clk);
2471 }
2472 }
2473
2474 return;
2475}
2476
2477/**
2478 * _setup_reset - reset an IP block during the setup process
2479 * @oh: struct omap_hwmod *
2480 *
2481 * Reset the IP block corresponding to the hwmod @oh during the setup
2482 * process. The IP block is first enabled so it can be successfully
2483 * reset. Returns 0 upon success or a negative error code upon
2484 * failure.
2485 */
2486static int __init _setup_reset(struct omap_hwmod *oh)
2487{
2488 int r;
2489
2490 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2491 return -EINVAL;
2492
2493 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2494 return -EPERM;
2495
2496 if (oh->rst_lines_cnt == 0) {
2497 r = _enable(oh);
2498 if (r) {
2499 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2500 oh->name, oh->_state);
2501 return -EINVAL;
2502 }
2503 }
2504
2505 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2506 r = _reset(oh);
2507
2508 return r;
2509}
2510
2511/**
2512 * _setup_postsetup - transition to the appropriate state after _setup
2513 * @oh: struct omap_hwmod *
2514 *
2515 * Place an IP block represented by @oh into a "post-setup" state --
2516 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2517 * this function is called at the end of _setup().) The postsetup
2518 * state for an IP block can be changed by calling
2519 * omap_hwmod_enter_postsetup_state() early in the boot process,
2520 * before one of the omap_hwmod_setup*() functions are called for the
2521 * IP block.
2522 *
2523 * The IP block stays in this state until a PM runtime-based driver is
2524 * loaded for that IP block. A post-setup state of IDLE is
2525 * appropriate for almost all IP blocks with runtime PM-enabled
2526 * drivers, since those drivers are able to enable the IP block. A
2527 * post-setup state of ENABLED is appropriate for kernels with PM
2528 * runtime disabled. The DISABLED state is appropriate for unusual IP
2529 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2530 * included, since the WDTIMER starts running on reset and will reset
2531 * the MPU if left active.
2532 *
2533 * This post-setup mechanism is deprecated. Once all of the OMAP
2534 * drivers have been converted to use PM runtime, and all of the IP
2535 * block data and interconnect data is available to the hwmod code, it
2536 * should be possible to replace this mechanism with a "lazy reset"
2537 * arrangement. In a "lazy reset" setup, each IP block is enabled
2538 * when the driver first probes, then all remaining IP blocks without
2539 * drivers are either shut down or enabled after the drivers have
2540 * loaded. However, this cannot take place until the above
2541 * preconditions have been met, since otherwise the late reset code
2542 * has no way of knowing which IP blocks are in use by drivers, and
2543 * which ones are unused.
2544 *
2545 * No return value.
2546 */
2547static void __init _setup_postsetup(struct omap_hwmod *oh)
2548{
2549 u8 postsetup_state;
2550
2551 if (oh->rst_lines_cnt > 0)
2552 return;
2553
2554 postsetup_state = oh->_postsetup_state;
2555 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2556 postsetup_state = _HWMOD_STATE_ENABLED;
2557
2558 /*
2559 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2560 * it should be set by the core code as a runtime flag during startup
2561 */
2562 if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
2563 (postsetup_state == _HWMOD_STATE_IDLE)) {
2564 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2565 postsetup_state = _HWMOD_STATE_ENABLED;
2566 }
2567
2568 if (postsetup_state == _HWMOD_STATE_IDLE)
2569 _idle(oh);
2570 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2571 _shutdown(oh);
2572 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2573 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2574 oh->name, postsetup_state);
2575
2576 return;
2577}
2578
2579/**
2580 * _setup - prepare IP block hardware for use
2581 * @oh: struct omap_hwmod *
2582 * @n: (unused, pass NULL)
2583 *
2584 * Configure the IP block represented by @oh. This may include
2585 * enabling the IP block, resetting it, and placing it into a
2586 * post-setup state, depending on the type of IP block and applicable
2587 * flags. IP blocks are reset to prevent any previous configuration
2588 * by the bootloader or previous operating system from interfering
2589 * with power management or other parts of the system. The reset can
2590 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2591 * two phases for hwmod initialization. Code called here generally
2592 * affects the IP block hardware, or system integration hardware
2593 * associated with the IP block. Returns 0.
2594 */
2595static int __init _setup(struct omap_hwmod *oh, void *data)
2596{
2597 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2598 return 0;
2599
2600 if (oh->parent_hwmod) {
2601 int r;
2602
2603 r = _enable(oh->parent_hwmod);
2604 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2605 oh->name, oh->parent_hwmod->name);
2606 }
2607
2608 _setup_iclk_autoidle(oh);
2609
2610 if (!_setup_reset(oh))
2611 _setup_postsetup(oh);
2612
2613 if (oh->parent_hwmod) {
2614 u8 postsetup_state;
2615
2616 postsetup_state = oh->parent_hwmod->_postsetup_state;
2617
2618 if (postsetup_state == _HWMOD_STATE_IDLE)
2619 _idle(oh->parent_hwmod);
2620 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2621 _shutdown(oh->parent_hwmod);
2622 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2623 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2624 oh->parent_hwmod->name, postsetup_state);
2625 }
2626
2627 return 0;
2628}
2629
2630/**
2631 * _register - register a struct omap_hwmod
2632 * @oh: struct omap_hwmod *
2633 *
2634 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2635 * already has been registered by the same name; -EINVAL if the
2636 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2637 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2638 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2639 * success.
2640 *
2641 * XXX The data should be copied into bootmem, so the original data
2642 * should be marked __initdata and freed after init. This would allow
2643 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2644 * that the copy process would be relatively complex due to the large number
2645 * of substructures.
2646 */
2647static int __init _register(struct omap_hwmod *oh)
2648{
2649 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2650 (oh->_state != _HWMOD_STATE_UNKNOWN))
2651 return -EINVAL;
2652
2653 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2654
2655 if (_lookup(oh->name))
2656 return -EEXIST;
2657
2658 list_add_tail(&oh->node, &omap_hwmod_list);
2659
2660 INIT_LIST_HEAD(&oh->master_ports);
2661 INIT_LIST_HEAD(&oh->slave_ports);
2662 spin_lock_init(&oh->_lock);
2663 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2664
2665 oh->_state = _HWMOD_STATE_REGISTERED;
2666
2667 /*
2668 * XXX Rather than doing a strcmp(), this should test a flag
2669 * set in the hwmod data, inserted by the autogenerator code.
2670 */
2671 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2672 mpu_oh = oh;
2673
2674 return 0;
2675}
2676
2677/**
2678 * _alloc_links - return allocated memory for hwmod links
2679 * @ml: pointer to a struct omap_hwmod_link * for the master link
2680 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2681 *
2682 * Return pointers to two struct omap_hwmod_link records, via the
2683 * addresses pointed to by @ml and @sl. Will first attempt to return
2684 * memory allocated as part of a large initial block, but if that has
2685 * been exhausted, will allocate memory itself. Since ideally this
2686 * second allocation path will never occur, the number of these
2687 * 'supplemental' allocations will be logged when debugging is
2688 * enabled. Returns 0.
2689 */
2690static int __init _alloc_links(struct omap_hwmod_link **ml,
2691 struct omap_hwmod_link **sl)
2692{
2693 unsigned int sz;
2694
2695 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2696 *ml = &linkspace[free_ls++];
2697 *sl = &linkspace[free_ls++];
2698 return 0;
2699 }
2700
2701 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2702
2703 *sl = NULL;
2704 *ml = memblock_virt_alloc(sz, 0);
2705
2706 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2707
2708 ls_supp++;
2709 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2710 ls_supp * LINKS_PER_OCP_IF);
2711
2712 return 0;
2713};
2714
2715/**
2716 * _add_link - add an interconnect between two IP blocks
2717 * @oi: pointer to a struct omap_hwmod_ocp_if record
2718 *
2719 * Add struct omap_hwmod_link records connecting the master IP block
2720 * specified in @oi->master to @oi, and connecting the slave IP block
2721 * specified in @oi->slave to @oi. This code is assumed to run before
2722 * preemption or SMP has been enabled, thus avoiding the need for
2723 * locking in this code. Changes to this assumption will require
2724 * additional locking. Returns 0.
2725 */
2726static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2727{
2728 struct omap_hwmod_link *ml, *sl;
2729
2730 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2731 oi->slave->name);
2732
2733 _alloc_links(&ml, &sl);
2734
2735 ml->ocp_if = oi;
2736 list_add(&ml->node, &oi->master->master_ports);
2737 oi->master->masters_cnt++;
2738
2739 sl->ocp_if = oi;
2740 list_add(&sl->node, &oi->slave->slave_ports);
2741 oi->slave->slaves_cnt++;
2742
2743 return 0;
2744}
2745
2746/**
2747 * _register_link - register a struct omap_hwmod_ocp_if
2748 * @oi: struct omap_hwmod_ocp_if *
2749 *
2750 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2751 * has already been registered; -EINVAL if @oi is NULL or if the
2752 * record pointed to by @oi is missing required fields; or 0 upon
2753 * success.
2754 *
2755 * XXX The data should be copied into bootmem, so the original data
2756 * should be marked __initdata and freed after init. This would allow
2757 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2758 */
2759static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2760{
2761 if (!oi || !oi->master || !oi->slave || !oi->user)
2762 return -EINVAL;
2763
2764 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2765 return -EEXIST;
2766
2767 pr_debug("omap_hwmod: registering link from %s to %s\n",
2768 oi->master->name, oi->slave->name);
2769
2770 /*
2771 * Register the connected hwmods, if they haven't been
2772 * registered already
2773 */
2774 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2775 _register(oi->master);
2776
2777 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2778 _register(oi->slave);
2779
2780 _add_link(oi);
2781
2782 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2783
2784 return 0;
2785}
2786
2787/**
2788 * _alloc_linkspace - allocate large block of hwmod links
2789 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2790 *
2791 * Allocate a large block of struct omap_hwmod_link records. This
2792 * improves boot time significantly by avoiding the need to allocate
2793 * individual records one by one. If the number of records to
2794 * allocate in the block hasn't been manually specified, this function
2795 * will count the number of struct omap_hwmod_ocp_if records in @ois
2796 * and use that to determine the allocation size. For SoC families
2797 * that require multiple list registrations, such as OMAP3xxx, this
2798 * estimation process isn't optimal, so manual estimation is advised
2799 * in those cases. Returns -EEXIST if the allocation has already occurred
2800 * or 0 upon success.
2801 */
2802static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2803{
2804 unsigned int i = 0;
2805 unsigned int sz;
2806
2807 if (linkspace) {
2808 WARN(1, "linkspace already allocated\n");
2809 return -EEXIST;
2810 }
2811
2812 if (max_ls == 0)
2813 while (ois[i++])
2814 max_ls += LINKS_PER_OCP_IF;
2815
2816 sz = sizeof(struct omap_hwmod_link) * max_ls;
2817
2818 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2819 __func__, sz, max_ls);
2820
2821 linkspace = memblock_virt_alloc(sz, 0);
2822
2823 return 0;
2824}
2825
2826/* Static functions intended only for use in soc_ops field function pointers */
2827
2828/**
2829 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2830 * @oh: struct omap_hwmod *
2831 *
2832 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2833 * does not have an IDLEST bit or if the module successfully leaves
2834 * slave idle; otherwise, pass along the return value of the
2835 * appropriate *_cm*_wait_module_ready() function.
2836 */
2837static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2838{
2839 if (!oh)
2840 return -EINVAL;
2841
2842 if (oh->flags & HWMOD_NO_IDLEST)
2843 return 0;
2844
2845 if (!_find_mpu_rt_port(oh))
2846 return 0;
2847
2848 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2849
2850 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2851 oh->prcm.omap2.idlest_reg_id,
2852 oh->prcm.omap2.idlest_idle_bit);
2853}
2854
2855/**
2856 * _omap4_wait_target_ready - wait for a module to leave slave idle
2857 * @oh: struct omap_hwmod *
2858 *
2859 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2860 * does not have an IDLEST bit or if the module successfully leaves
2861 * slave idle; otherwise, pass along the return value of the
2862 * appropriate *_cm*_wait_module_ready() function.
2863 */
2864static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2865{
2866 if (!oh)
2867 return -EINVAL;
2868
2869 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2870 return 0;
2871
2872 if (!_find_mpu_rt_port(oh))
2873 return 0;
2874
2875 if (!oh->prcm.omap4.clkctrl_offs &&
2876 !(oh->prcm.omap4.flags & HWMOD_OMAP4_ZERO_CLKCTRL_OFFSET))
2877 return 0;
2878
2879 /* XXX check module SIDLEMODE, hardreset status */
2880
2881 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2882 oh->clkdm->cm_inst,
2883 oh->prcm.omap4.clkctrl_offs, 0);
2884}
2885
2886/**
2887 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2888 * @oh: struct omap_hwmod * to assert hardreset
2889 * @ohri: hardreset line data
2890 *
2891 * Call omap2_prm_assert_hardreset() with parameters extracted from
2892 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2893 * use as an soc_ops function pointer. Passes along the return value
2894 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2895 * for removal when the PRM code is moved into drivers/.
2896 */
2897static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2898 struct omap_hwmod_rst_info *ohri)
2899{
2900 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2901 oh->prcm.omap2.module_offs, 0);
2902}
2903
2904/**
2905 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2906 * @oh: struct omap_hwmod * to deassert hardreset
2907 * @ohri: hardreset line data
2908 *
2909 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2910 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2911 * use as an soc_ops function pointer. Passes along the return value
2912 * from omap2_prm_deassert_hardreset(). XXX This function is
2913 * scheduled for removal when the PRM code is moved into drivers/.
2914 */
2915static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2916 struct omap_hwmod_rst_info *ohri)
2917{
2918 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2919 oh->prcm.omap2.module_offs, 0, 0);
2920}
2921
2922/**
2923 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2924 * @oh: struct omap_hwmod * to test hardreset
2925 * @ohri: hardreset line data
2926 *
2927 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2928 * from the hwmod @oh and the hardreset line data @ohri. Only
2929 * intended for use as an soc_ops function pointer. Passes along the
2930 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2931 * function is scheduled for removal when the PRM code is moved into
2932 * drivers/.
2933 */
2934static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2935 struct omap_hwmod_rst_info *ohri)
2936{
2937 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2938 oh->prcm.omap2.module_offs, 0);
2939}
2940
2941/**
2942 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2943 * @oh: struct omap_hwmod * to assert hardreset
2944 * @ohri: hardreset line data
2945 *
2946 * Call omap4_prminst_assert_hardreset() with parameters extracted
2947 * from the hwmod @oh and the hardreset line data @ohri. Only
2948 * intended for use as an soc_ops function pointer. Passes along the
2949 * return value from omap4_prminst_assert_hardreset(). XXX This
2950 * function is scheduled for removal when the PRM code is moved into
2951 * drivers/.
2952 */
2953static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2954 struct omap_hwmod_rst_info *ohri)
2955{
2956 if (!oh->clkdm)
2957 return -EINVAL;
2958
2959 return omap_prm_assert_hardreset(ohri->rst_shift,
2960 oh->clkdm->pwrdm.ptr->prcm_partition,
2961 oh->clkdm->pwrdm.ptr->prcm_offs,
2962 oh->prcm.omap4.rstctrl_offs);
2963}
2964
2965/**
2966 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2967 * @oh: struct omap_hwmod * to deassert hardreset
2968 * @ohri: hardreset line data
2969 *
2970 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2971 * from the hwmod @oh and the hardreset line data @ohri. Only
2972 * intended for use as an soc_ops function pointer. Passes along the
2973 * return value from omap4_prminst_deassert_hardreset(). XXX This
2974 * function is scheduled for removal when the PRM code is moved into
2975 * drivers/.
2976 */
2977static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2978 struct omap_hwmod_rst_info *ohri)
2979{
2980 if (!oh->clkdm)
2981 return -EINVAL;
2982
2983 if (ohri->st_shift)
2984 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2985 oh->name, ohri->name);
2986 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
2987 oh->clkdm->pwrdm.ptr->prcm_partition,
2988 oh->clkdm->pwrdm.ptr->prcm_offs,
2989 oh->prcm.omap4.rstctrl_offs,
2990 oh->prcm.omap4.rstctrl_offs +
2991 OMAP4_RST_CTRL_ST_OFFSET);
2992}
2993
2994/**
2995 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2996 * @oh: struct omap_hwmod * to test hardreset
2997 * @ohri: hardreset line data
2998 *
2999 * Call omap4_prminst_is_hardreset_asserted() with parameters
3000 * extracted from the hwmod @oh and the hardreset line data @ohri.
3001 * Only intended for use as an soc_ops function pointer. Passes along
3002 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3003 * This function is scheduled for removal when the PRM code is moved
3004 * into drivers/.
3005 */
3006static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3007 struct omap_hwmod_rst_info *ohri)
3008{
3009 if (!oh->clkdm)
3010 return -EINVAL;
3011
3012 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
3013 oh->clkdm->pwrdm.ptr->
3014 prcm_partition,
3015 oh->clkdm->pwrdm.ptr->prcm_offs,
3016 oh->prcm.omap4.rstctrl_offs);
3017}
3018
3019/**
3020 * _omap4_disable_direct_prcm - disable direct PRCM control for hwmod
3021 * @oh: struct omap_hwmod * to disable control for
3022 *
3023 * Disables direct PRCM clkctrl done by hwmod core. Instead, the hwmod
3024 * will be using its main_clk to enable/disable the module. Returns
3025 * 0 if successful.
3026 */
3027static int _omap4_disable_direct_prcm(struct omap_hwmod *oh)
3028{
3029 if (!oh)
3030 return -EINVAL;
3031
3032 oh->prcm.omap4.clkctrl_offs = 0;
3033 oh->prcm.omap4.modulemode = 0;
3034
3035 return 0;
3036}
3037
3038/**
3039 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3040 * @oh: struct omap_hwmod * to deassert hardreset
3041 * @ohri: hardreset line data
3042 *
3043 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3044 * from the hwmod @oh and the hardreset line data @ohri. Only
3045 * intended for use as an soc_ops function pointer. Passes along the
3046 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3047 * function is scheduled for removal when the PRM code is moved into
3048 * drivers/.
3049 */
3050static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3051 struct omap_hwmod_rst_info *ohri)
3052{
3053 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
3054 oh->clkdm->pwrdm.ptr->prcm_partition,
3055 oh->clkdm->pwrdm.ptr->prcm_offs,
3056 oh->prcm.omap4.rstctrl_offs,
3057 oh->prcm.omap4.rstst_offs);
3058}
3059
3060/* Public functions */
3061
3062u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3063{
3064 if (oh->flags & HWMOD_16BIT_REG)
3065 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
3066 else
3067 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
3068}
3069
3070void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3071{
3072 if (oh->flags & HWMOD_16BIT_REG)
3073 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
3074 else
3075 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
3076}
3077
3078/**
3079 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3080 * @oh: struct omap_hwmod *
3081 *
3082 * This is a public function exposed to drivers. Some drivers may need to do
3083 * some settings before and after resetting the device. Those drivers after
3084 * doing the necessary settings could use this function to start a reset by
3085 * setting the SYSCONFIG.SOFTRESET bit.
3086 */
3087int omap_hwmod_softreset(struct omap_hwmod *oh)
3088{
3089 u32 v;
3090 int ret;
3091
3092 if (!oh || !(oh->_sysc_cache))
3093 return -EINVAL;
3094
3095 v = oh->_sysc_cache;
3096 ret = _set_softreset(oh, &v);
3097 if (ret)
3098 goto error;
3099 _write_sysconfig(v, oh);
3100
3101 ret = _clear_softreset(oh, &v);
3102 if (ret)
3103 goto error;
3104 _write_sysconfig(v, oh);
3105
3106error:
3107 return ret;
3108}
3109
3110/**
3111 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3112 * @name: name of the omap_hwmod to look up
3113 *
3114 * Given a @name of an omap_hwmod, return a pointer to the registered
3115 * struct omap_hwmod *, or NULL upon error.
3116 */
3117struct omap_hwmod *omap_hwmod_lookup(const char *name)
3118{
3119 struct omap_hwmod *oh;
3120
3121 if (!name)
3122 return NULL;
3123
3124 oh = _lookup(name);
3125
3126 return oh;
3127}
3128
3129/**
3130 * omap_hwmod_for_each - call function for each registered omap_hwmod
3131 * @fn: pointer to a callback function
3132 * @data: void * data to pass to callback function
3133 *
3134 * Call @fn for each registered omap_hwmod, passing @data to each
3135 * function. @fn must return 0 for success or any other value for
3136 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3137 * will stop and the non-zero return value will be passed to the
3138 * caller of omap_hwmod_for_each(). @fn is called with
3139 * omap_hwmod_for_each() held.
3140 */
3141int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3142 void *data)
3143{
3144 struct omap_hwmod *temp_oh;
3145 int ret = 0;
3146
3147 if (!fn)
3148 return -EINVAL;
3149
3150 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3151 ret = (*fn)(temp_oh, data);
3152 if (ret)
3153 break;
3154 }
3155
3156 return ret;
3157}
3158
3159/**
3160 * omap_hwmod_register_links - register an array of hwmod links
3161 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3162 *
3163 * Intended to be called early in boot before the clock framework is
3164 * initialized. If @ois is not null, will register all omap_hwmods
3165 * listed in @ois that are valid for this chip. Returns -EINVAL if
3166 * omap_hwmod_init() hasn't been called before calling this function,
3167 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3168 * success.
3169 */
3170int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3171{
3172 int r, i;
3173
3174 if (!inited)
3175 return -EINVAL;
3176
3177 if (!ois)
3178 return 0;
3179
3180 if (ois[0] == NULL) /* Empty list */
3181 return 0;
3182
3183 if (!linkspace) {
3184 if (_alloc_linkspace(ois)) {
3185 pr_err("omap_hwmod: could not allocate link space\n");
3186 return -ENOMEM;
3187 }
3188 }
3189
3190 i = 0;
3191 do {
3192 r = _register_link(ois[i]);
3193 WARN(r && r != -EEXIST,
3194 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3195 ois[i]->master->name, ois[i]->slave->name, r);
3196 } while (ois[++i]);
3197
3198 return 0;
3199}
3200
3201/**
3202 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3203 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3204 *
3205 * If the hwmod data corresponding to the MPU subsystem IP block
3206 * hasn't been initialized and set up yet, do so now. This must be
3207 * done first since sleep dependencies may be added from other hwmods
3208 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3209 * return value.
3210 */
3211static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3212{
3213 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3214 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3215 __func__, MPU_INITIATOR_NAME);
3216 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3217 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3218}
3219
3220/**
3221 * omap_hwmod_setup_one - set up a single hwmod
3222 * @oh_name: const char * name of the already-registered hwmod to set up
3223 *
3224 * Initialize and set up a single hwmod. Intended to be used for a
3225 * small number of early devices, such as the timer IP blocks used for
3226 * the scheduler clock. Must be called after omap2_clk_init().
3227 * Resolves the struct clk names to struct clk pointers for each
3228 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3229 * -EINVAL upon error or 0 upon success.
3230 */
3231int __init omap_hwmod_setup_one(const char *oh_name)
3232{
3233 struct omap_hwmod *oh;
3234
3235 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3236
3237 oh = _lookup(oh_name);
3238 if (!oh) {
3239 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3240 return -EINVAL;
3241 }
3242
3243 _ensure_mpu_hwmod_is_setup(oh);
3244
3245 _init(oh, NULL);
3246 _setup(oh, NULL);
3247
3248 return 0;
3249}
3250
3251/**
3252 * omap_hwmod_setup_all - set up all registered IP blocks
3253 *
3254 * Initialize and set up all IP blocks registered with the hwmod code.
3255 * Must be called after omap2_clk_init(). Resolves the struct clk
3256 * names to struct clk pointers for each registered omap_hwmod. Also
3257 * calls _setup() on each hwmod. Returns 0 upon success.
3258 */
3259static int __init omap_hwmod_setup_all(void)
3260{
3261 _ensure_mpu_hwmod_is_setup(NULL);
3262
3263 omap_hwmod_for_each(_init, NULL);
3264 omap_hwmod_for_each(_setup, NULL);
3265
3266 return 0;
3267}
3268omap_postcore_initcall(omap_hwmod_setup_all);
3269
3270/**
3271 * omap_hwmod_enable - enable an omap_hwmod
3272 * @oh: struct omap_hwmod *
3273 *
3274 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3275 * Returns -EINVAL on error or passes along the return value from _enable().
3276 */
3277int omap_hwmod_enable(struct omap_hwmod *oh)
3278{
3279 int r;
3280 unsigned long flags;
3281
3282 if (!oh)
3283 return -EINVAL;
3284
3285 spin_lock_irqsave(&oh->_lock, flags);
3286 r = _enable(oh);
3287 spin_unlock_irqrestore(&oh->_lock, flags);
3288
3289 return r;
3290}
3291
3292/**
3293 * omap_hwmod_idle - idle an omap_hwmod
3294 * @oh: struct omap_hwmod *
3295 *
3296 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3297 * Returns -EINVAL on error or passes along the return value from _idle().
3298 */
3299int omap_hwmod_idle(struct omap_hwmod *oh)
3300{
3301 int r;
3302 unsigned long flags;
3303
3304 if (!oh)
3305 return -EINVAL;
3306
3307 spin_lock_irqsave(&oh->_lock, flags);
3308 r = _idle(oh);
3309 spin_unlock_irqrestore(&oh->_lock, flags);
3310
3311 return r;
3312}
3313
3314/**
3315 * omap_hwmod_shutdown - shutdown an omap_hwmod
3316 * @oh: struct omap_hwmod *
3317 *
3318 * Shutdown an omap_hwmod @oh. Intended to be called by
3319 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3320 * the return value from _shutdown().
3321 */
3322int omap_hwmod_shutdown(struct omap_hwmod *oh)
3323{
3324 int r;
3325 unsigned long flags;
3326
3327 if (!oh)
3328 return -EINVAL;
3329
3330 spin_lock_irqsave(&oh->_lock, flags);
3331 r = _shutdown(oh);
3332 spin_unlock_irqrestore(&oh->_lock, flags);
3333
3334 return r;
3335}
3336
3337/*
3338 * IP block data retrieval functions
3339 */
3340
3341/**
3342 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3343 * @oh: struct omap_hwmod *
3344 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3345 *
3346 * Count the number of struct resource array elements necessary to
3347 * contain omap_hwmod @oh resources. Intended to be called by code
3348 * that registers omap_devices. Intended to be used to determine the
3349 * size of a dynamically-allocated struct resource array, before
3350 * calling omap_hwmod_fill_resources(). Returns the number of struct
3351 * resource array elements needed.
3352 *
3353 * XXX This code is not optimized. It could attempt to merge adjacent
3354 * resource IDs.
3355 *
3356 */
3357int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3358{
3359 int ret = 0;
3360
3361 if (flags & IORESOURCE_IRQ)
3362 ret += _count_mpu_irqs(oh);
3363
3364 if (flags & IORESOURCE_DMA)
3365 ret += _count_sdma_reqs(oh);
3366
3367 if (flags & IORESOURCE_MEM) {
3368 int i = 0;
3369 struct omap_hwmod_ocp_if *os;
3370 struct list_head *p = oh->slave_ports.next;
3371
3372 while (i < oh->slaves_cnt) {
3373 os = _fetch_next_ocp_if(&p, &i);
3374 ret += _count_ocp_if_addr_spaces(os);
3375 }
3376 }
3377
3378 return ret;
3379}
3380
3381/**
3382 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3383 * @oh: struct omap_hwmod *
3384 * @res: pointer to the first element of an array of struct resource to fill
3385 *
3386 * Fill the struct resource array @res with resource data from the
3387 * omap_hwmod @oh. Intended to be called by code that registers
3388 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3389 * number of array elements filled.
3390 */
3391int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3392{
3393 struct omap_hwmod_ocp_if *os;
3394 struct list_head *p;
3395 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3396 int r = 0;
3397
3398 /* For each IRQ, DMA, memory area, fill in array.*/
3399
3400 mpu_irqs_cnt = _count_mpu_irqs(oh);
3401 for (i = 0; i < mpu_irqs_cnt; i++) {
3402 unsigned int irq;
3403
3404 if (oh->xlate_irq)
3405 irq = oh->xlate_irq((oh->mpu_irqs + i)->irq);
3406 else
3407 irq = (oh->mpu_irqs + i)->irq;
3408 (res + r)->name = (oh->mpu_irqs + i)->name;
3409 (res + r)->start = irq;
3410 (res + r)->end = irq;
3411 (res + r)->flags = IORESOURCE_IRQ;
3412 r++;
3413 }
3414
3415 sdma_reqs_cnt = _count_sdma_reqs(oh);
3416 for (i = 0; i < sdma_reqs_cnt; i++) {
3417 (res + r)->name = (oh->sdma_reqs + i)->name;
3418 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3419 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3420 (res + r)->flags = IORESOURCE_DMA;
3421 r++;
3422 }
3423
3424 p = oh->slave_ports.next;
3425
3426 i = 0;
3427 while (i < oh->slaves_cnt) {
3428 os = _fetch_next_ocp_if(&p, &i);
3429 addr_cnt = _count_ocp_if_addr_spaces(os);
3430
3431 for (j = 0; j < addr_cnt; j++) {
3432 (res + r)->name = (os->addr + j)->name;
3433 (res + r)->start = (os->addr + j)->pa_start;
3434 (res + r)->end = (os->addr + j)->pa_end;
3435 (res + r)->flags = IORESOURCE_MEM;
3436 r++;
3437 }
3438 }
3439
3440 return r;
3441}
3442
3443/**
3444 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3445 * @oh: struct omap_hwmod *
3446 * @res: pointer to the array of struct resource to fill
3447 *
3448 * Fill the struct resource array @res with dma resource data from the
3449 * omap_hwmod @oh. Intended to be called by code that registers
3450 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3451 * number of array elements filled.
3452 */
3453int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3454{
3455 int i, sdma_reqs_cnt;
3456 int r = 0;
3457
3458 sdma_reqs_cnt = _count_sdma_reqs(oh);
3459 for (i = 0; i < sdma_reqs_cnt; i++) {
3460 (res + r)->name = (oh->sdma_reqs + i)->name;
3461 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3462 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3463 (res + r)->flags = IORESOURCE_DMA;
3464 r++;
3465 }
3466
3467 return r;
3468}
3469
3470/**
3471 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3472 * @oh: struct omap_hwmod * to operate on
3473 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3474 * @name: pointer to the name of the data to fetch (optional)
3475 * @rsrc: pointer to a struct resource, allocated by the caller
3476 *
3477 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3478 * data for the IP block pointed to by @oh. The data will be filled
3479 * into a struct resource record pointed to by @rsrc. The struct
3480 * resource must be allocated by the caller. When @name is non-null,
3481 * the data associated with the matching entry in the IRQ/SDMA/address
3482 * space hwmod data arrays will be returned. If @name is null, the
3483 * first array entry will be returned. Data order is not meaningful
3484 * in hwmod data, so callers are strongly encouraged to use a non-null
3485 * @name whenever possible to avoid unpredictable effects if hwmod
3486 * data is later added that causes data ordering to change. This
3487 * function is only intended for use by OMAP core code. Device
3488 * drivers should not call this function - the appropriate bus-related
3489 * data accessor functions should be used instead. Returns 0 upon
3490 * success or a negative error code upon error.
3491 */
3492int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3493 const char *name, struct resource *rsrc)
3494{
3495 int r;
3496 unsigned int irq, dma;
3497 u32 pa_start, pa_end;
3498
3499 if (!oh || !rsrc)
3500 return -EINVAL;
3501
3502 if (type == IORESOURCE_IRQ) {
3503 r = _get_mpu_irq_by_name(oh, name, &irq);
3504 if (r)
3505 return r;
3506
3507 rsrc->start = irq;
3508 rsrc->end = irq;
3509 } else if (type == IORESOURCE_DMA) {
3510 r = _get_sdma_req_by_name(oh, name, &dma);
3511 if (r)
3512 return r;
3513
3514 rsrc->start = dma;
3515 rsrc->end = dma;
3516 } else if (type == IORESOURCE_MEM) {
3517 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3518 if (r)
3519 return r;
3520
3521 rsrc->start = pa_start;
3522 rsrc->end = pa_end;
3523 } else {
3524 return -EINVAL;
3525 }
3526
3527 rsrc->flags = type;
3528 rsrc->name = name;
3529
3530 return 0;
3531}
3532
3533/**
3534 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3535 * @oh: struct omap_hwmod *
3536 *
3537 * Return the powerdomain pointer associated with the OMAP module
3538 * @oh's main clock. If @oh does not have a main clk, return the
3539 * powerdomain associated with the interface clock associated with the
3540 * module's MPU port. (XXX Perhaps this should use the SDMA port
3541 * instead?) Returns NULL on error, or a struct powerdomain * on
3542 * success.
3543 */
3544struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3545{
3546 struct clk *c;
3547 struct omap_hwmod_ocp_if *oi;
3548 struct clockdomain *clkdm;
3549 struct clk_hw_omap *clk;
3550
3551 if (!oh)
3552 return NULL;
3553
3554 if (oh->clkdm)
3555 return oh->clkdm->pwrdm.ptr;
3556
3557 if (oh->_clk) {
3558 c = oh->_clk;
3559 } else {
3560 oi = _find_mpu_rt_port(oh);
3561 if (!oi)
3562 return NULL;
3563 c = oi->_clk;
3564 }
3565
3566 clk = to_clk_hw_omap(__clk_get_hw(c));
3567 clkdm = clk->clkdm;
3568 if (!clkdm)
3569 return NULL;
3570
3571 return clkdm->pwrdm.ptr;
3572}
3573
3574/**
3575 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3576 * @oh: struct omap_hwmod *
3577 *
3578 * Returns the virtual address corresponding to the beginning of the
3579 * module's register target, in the address range that is intended to
3580 * be used by the MPU. Returns the virtual address upon success or NULL
3581 * upon error.
3582 */
3583void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3584{
3585 if (!oh)
3586 return NULL;
3587
3588 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3589 return NULL;
3590
3591 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3592 return NULL;
3593
3594 return oh->_mpu_rt_va;
3595}
3596
3597/*
3598 * XXX what about functions for drivers to save/restore ocp_sysconfig
3599 * for context save/restore operations?
3600 */
3601
3602/**
3603 * omap_hwmod_enable_wakeup - allow device to wake up the system
3604 * @oh: struct omap_hwmod *
3605 *
3606 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3607 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3608 * this IP block if it has dynamic mux entries. Eventually this
3609 * should set PRCM wakeup registers to cause the PRCM to receive
3610 * wakeup events from the module. Does not set any wakeup routing
3611 * registers beyond this point - if the module is to wake up any other
3612 * module or subsystem, that must be set separately. Called by
3613 * omap_device code. Returns -EINVAL on error or 0 upon success.
3614 */
3615int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3616{
3617 unsigned long flags;
3618 u32 v;
3619
3620 spin_lock_irqsave(&oh->_lock, flags);
3621
3622 if (oh->class->sysc &&
3623 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3624 v = oh->_sysc_cache;
3625 _enable_wakeup(oh, &v);
3626 _write_sysconfig(v, oh);
3627 }
3628
3629 spin_unlock_irqrestore(&oh->_lock, flags);
3630
3631 return 0;
3632}
3633
3634/**
3635 * omap_hwmod_disable_wakeup - prevent device from waking the system
3636 * @oh: struct omap_hwmod *
3637 *
3638 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3639 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3640 * events for this IP block if it has dynamic mux entries. Eventually
3641 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3642 * wakeup events from the module. Does not set any wakeup routing
3643 * registers beyond this point - if the module is to wake up any other
3644 * module or subsystem, that must be set separately. Called by
3645 * omap_device code. Returns -EINVAL on error or 0 upon success.
3646 */
3647int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3648{
3649 unsigned long flags;
3650 u32 v;
3651
3652 spin_lock_irqsave(&oh->_lock, flags);
3653
3654 if (oh->class->sysc &&
3655 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3656 v = oh->_sysc_cache;
3657 _disable_wakeup(oh, &v);
3658 _write_sysconfig(v, oh);
3659 }
3660
3661 spin_unlock_irqrestore(&oh->_lock, flags);
3662
3663 return 0;
3664}
3665
3666/**
3667 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3668 * contained in the hwmod module.
3669 * @oh: struct omap_hwmod *
3670 * @name: name of the reset line to lookup and assert
3671 *
3672 * Some IP like dsp, ipu or iva contain processor that require
3673 * an HW reset line to be assert / deassert in order to enable fully
3674 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3675 * yet supported on this OMAP; otherwise, passes along the return value
3676 * from _assert_hardreset().
3677 */
3678int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3679{
3680 int ret;
3681 unsigned long flags;
3682
3683 if (!oh)
3684 return -EINVAL;
3685
3686 spin_lock_irqsave(&oh->_lock, flags);
3687 ret = _assert_hardreset(oh, name);
3688 spin_unlock_irqrestore(&oh->_lock, flags);
3689
3690 return ret;
3691}
3692
3693/**
3694 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3695 * contained in the hwmod module.
3696 * @oh: struct omap_hwmod *
3697 * @name: name of the reset line to look up and deassert
3698 *
3699 * Some IP like dsp, ipu or iva contain processor that require
3700 * an HW reset line to be assert / deassert in order to enable fully
3701 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3702 * yet supported on this OMAP; otherwise, passes along the return value
3703 * from _deassert_hardreset().
3704 */
3705int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3706{
3707 int ret;
3708 unsigned long flags;
3709
3710 if (!oh)
3711 return -EINVAL;
3712
3713 spin_lock_irqsave(&oh->_lock, flags);
3714 ret = _deassert_hardreset(oh, name);
3715 spin_unlock_irqrestore(&oh->_lock, flags);
3716
3717 return ret;
3718}
3719
3720/**
3721 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3722 * @classname: struct omap_hwmod_class name to search for
3723 * @fn: callback function pointer to call for each hwmod in class @classname
3724 * @user: arbitrary context data to pass to the callback function
3725 *
3726 * For each omap_hwmod of class @classname, call @fn.
3727 * If the callback function returns something other than
3728 * zero, the iterator is terminated, and the callback function's return
3729 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3730 * if @classname or @fn are NULL, or passes back the error code from @fn.
3731 */
3732int omap_hwmod_for_each_by_class(const char *classname,
3733 int (*fn)(struct omap_hwmod *oh,
3734 void *user),
3735 void *user)
3736{
3737 struct omap_hwmod *temp_oh;
3738 int ret = 0;
3739
3740 if (!classname || !fn)
3741 return -EINVAL;
3742
3743 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3744 __func__, classname);
3745
3746 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3747 if (!strcmp(temp_oh->class->name, classname)) {
3748 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3749 __func__, temp_oh->name);
3750 ret = (*fn)(temp_oh, user);
3751 if (ret)
3752 break;
3753 }
3754 }
3755
3756 if (ret)
3757 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3758 __func__, ret);
3759
3760 return ret;
3761}
3762
3763/**
3764 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3765 * @oh: struct omap_hwmod *
3766 * @state: state that _setup() should leave the hwmod in
3767 *
3768 * Sets the hwmod state that @oh will enter at the end of _setup()
3769 * (called by omap_hwmod_setup_*()). See also the documentation
3770 * for _setup_postsetup(), above. Returns 0 upon success or
3771 * -EINVAL if there is a problem with the arguments or if the hwmod is
3772 * in the wrong state.
3773 */
3774int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3775{
3776 int ret;
3777 unsigned long flags;
3778
3779 if (!oh)
3780 return -EINVAL;
3781
3782 if (state != _HWMOD_STATE_DISABLED &&
3783 state != _HWMOD_STATE_ENABLED &&
3784 state != _HWMOD_STATE_IDLE)
3785 return -EINVAL;
3786
3787 spin_lock_irqsave(&oh->_lock, flags);
3788
3789 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3790 ret = -EINVAL;
3791 goto ohsps_unlock;
3792 }
3793
3794 oh->_postsetup_state = state;
3795 ret = 0;
3796
3797ohsps_unlock:
3798 spin_unlock_irqrestore(&oh->_lock, flags);
3799
3800 return ret;
3801}
3802
3803/**
3804 * omap_hwmod_get_context_loss_count - get lost context count
3805 * @oh: struct omap_hwmod *
3806 *
3807 * Returns the context loss count of associated @oh
3808 * upon success, or zero if no context loss data is available.
3809 *
3810 * On OMAP4, this queries the per-hwmod context loss register,
3811 * assuming one exists. If not, or on OMAP2/3, this queries the
3812 * enclosing powerdomain context loss count.
3813 */
3814int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3815{
3816 struct powerdomain *pwrdm;
3817 int ret = 0;
3818
3819 if (soc_ops.get_context_lost)
3820 return soc_ops.get_context_lost(oh);
3821
3822 pwrdm = omap_hwmod_get_pwrdm(oh);
3823 if (pwrdm)
3824 ret = pwrdm_get_context_loss_count(pwrdm);
3825
3826 return ret;
3827}
3828
3829/**
3830 * omap_hwmod_init - initialize the hwmod code
3831 *
3832 * Sets up some function pointers needed by the hwmod code to operate on the
3833 * currently-booted SoC. Intended to be called once during kernel init
3834 * before any hwmods are registered. No return value.
3835 */
3836void __init omap_hwmod_init(void)
3837{
3838 if (cpu_is_omap24xx()) {
3839 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3840 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3841 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3842 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3843 } else if (cpu_is_omap34xx()) {
3844 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3845 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3846 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3847 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3848 soc_ops.init_clkdm = _init_clkdm;
3849 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
3850 soc_ops.enable_module = _omap4_enable_module;
3851 soc_ops.disable_module = _omap4_disable_module;
3852 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3853 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3854 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
3855 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3856 soc_ops.init_clkdm = _init_clkdm;
3857 soc_ops.update_context_lost = _omap4_update_context_lost;
3858 soc_ops.get_context_lost = _omap4_get_context_lost;
3859 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
3860 } else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
3861 soc_is_am43xx()) {
3862 soc_ops.enable_module = _omap4_enable_module;
3863 soc_ops.disable_module = _omap4_disable_module;
3864 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3865 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3866 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
3867 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3868 soc_ops.init_clkdm = _init_clkdm;
3869 soc_ops.disable_direct_prcm = _omap4_disable_direct_prcm;
3870 } else {
3871 WARN(1, "omap_hwmod: unknown SoC type\n");
3872 }
3873
3874 inited = true;
3875}
3876
3877/**
3878 * omap_hwmod_get_main_clk - get pointer to main clock name
3879 * @oh: struct omap_hwmod *
3880 *
3881 * Returns the main clock name assocated with @oh upon success,
3882 * or NULL if @oh is NULL.
3883 */
3884const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
3885{
3886 if (!oh)
3887 return NULL;
3888
3889 return oh->main_clk;
3890}