2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009 Nokia Corporation
6 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
8 * Created in collaboration with (alphabetical order): Thara Gopinath,
9 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
10 * Sawant, Santosh Shilimkar, Richard Woodruff
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
16 * This code manages "OMAP modules" (on-chip devices) and their
17 * integration with Linux device driver and bus code.
20 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
21 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
22 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
23 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
24 * - Open Core Protocol Specification 2.2
29 * - bus throughput & module latency measurement code
31 * XXX add tests at the beginning of each function to ensure the hwmod is
32 * in the appropriate state
33 * XXX error return values should be checked to ensure that they are
38 #include <linux/kernel.h>
39 #include <linux/errno.h>
41 #include <linux/clk.h>
42 #include <linux/delay.h>
43 #include <linux/err.h>
44 #include <linux/list.h>
45 #include <linux/mutex.h>
47 #include <plat/common.h>
49 #include <plat/clockdomain.h>
50 #include <plat/powerdomain.h>
51 #include <plat/clock.h>
52 #include <plat/omap_hwmod.h>
56 /* Maximum microseconds to wait for OMAP module to reset */
57 #define MAX_MODULE_RESET_WAIT 10000
59 /* Name of the OMAP hwmod for the MPU */
60 #define MPU_INITIATOR_NAME "mpu"
62 /* omap_hwmod_list contains all registered struct omap_hwmods */
63 static LIST_HEAD(omap_hwmod_list
);
65 static DEFINE_MUTEX(omap_hwmod_mutex
);
67 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
68 static struct omap_hwmod
*mpu_oh
;
70 /* inited: 0 if omap_hwmod_init() has not yet been called; 1 otherwise */
74 /* Private functions */
77 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
78 * @oh: struct omap_hwmod *
80 * Load the current value of the hwmod OCP_SYSCONFIG register into the
81 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
82 * OCP_SYSCONFIG register or 0 upon success.
84 static int _update_sysc_cache(struct omap_hwmod
*oh
)
86 if (!oh
->class->sysc
) {
87 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
91 /* XXX ensure module interface clock is up */
93 oh
->_sysc_cache
= omap_hwmod_readl(oh
, oh
->class->sysc
->sysc_offs
);
95 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
96 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
102 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
103 * @v: OCP_SYSCONFIG value to write
104 * @oh: struct omap_hwmod *
106 * Write @v into the module class' OCP_SYSCONFIG register, if it has
107 * one. No return value.
109 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
111 if (!oh
->class->sysc
) {
112 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
116 /* XXX ensure module interface clock is up */
118 if (oh
->_sysc_cache
!= v
) {
120 omap_hwmod_writel(v
, oh
, oh
->class->sysc
->sysc_offs
);
125 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
126 * @oh: struct omap_hwmod *
127 * @standbymode: MIDLEMODE field bits
128 * @v: pointer to register contents to modify
130 * Update the master standby mode bits in @v to be @standbymode for
131 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
132 * upon error or 0 upon success.
134 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
140 if (!oh
->class->sysc
||
141 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
144 if (!oh
->class->sysc
->sysc_fields
) {
145 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
149 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
150 mstandby_mask
= (0x3 << mstandby_shift
);
152 *v
&= ~mstandby_mask
;
153 *v
|= __ffs(standbymode
) << mstandby_shift
;
159 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
160 * @oh: struct omap_hwmod *
161 * @idlemode: SIDLEMODE field bits
162 * @v: pointer to register contents to modify
164 * Update the slave idle mode bits in @v to be @idlemode for the @oh
165 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
168 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
173 if (!oh
->class->sysc
||
174 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
177 if (!oh
->class->sysc
->sysc_fields
) {
178 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
182 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
183 sidle_mask
= (0x3 << sidle_shift
);
186 *v
|= __ffs(idlemode
) << sidle_shift
;
192 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
193 * @oh: struct omap_hwmod *
194 * @clockact: CLOCKACTIVITY field bits
195 * @v: pointer to register contents to modify
197 * Update the clockactivity mode bits in @v to be @clockact for the
198 * @oh hwmod. Used for additional powersaving on some modules. Does
199 * not write to the hardware. Returns -EINVAL upon error or 0 upon
202 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
207 if (!oh
->class->sysc
||
208 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
211 if (!oh
->class->sysc
->sysc_fields
) {
212 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
216 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
217 clkact_mask
= (0x3 << clkact_shift
);
220 *v
|= clockact
<< clkact_shift
;
226 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
227 * @oh: struct omap_hwmod *
228 * @v: pointer to register contents to modify
230 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
231 * error or 0 upon success.
233 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
237 if (!oh
->class->sysc
||
238 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
241 if (!oh
->class->sysc
->sysc_fields
) {
242 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
246 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
254 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
255 * @oh: struct omap_hwmod *
256 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
257 * @v: pointer to register contents to modify
259 * Update the module autoidle bit in @v to be @autoidle for the @oh
260 * hwmod. The autoidle bit controls whether the module can gate
261 * internal clocks automatically when it isn't doing anything; the
262 * exact function of this bit varies on a per-module basis. This
263 * function does not write to the hardware. Returns -EINVAL upon
264 * error or 0 upon success.
266 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
272 if (!oh
->class->sysc
||
273 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
276 if (!oh
->class->sysc
->sysc_fields
) {
277 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
281 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
282 autoidle_mask
= (0x3 << autoidle_shift
);
284 *v
&= ~autoidle_mask
;
285 *v
|= autoidle
<< autoidle_shift
;
291 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
292 * @oh: struct omap_hwmod *
294 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
295 * upon error or 0 upon success.
297 static int _enable_wakeup(struct omap_hwmod
*oh
)
301 if (!oh
->class->sysc
||
302 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
305 if (!oh
->class->sysc
->sysc_fields
) {
306 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
310 wakeup_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
314 _write_sysconfig(v
, oh
);
316 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
318 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
324 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
325 * @oh: struct omap_hwmod *
327 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
328 * upon error or 0 upon success.
330 static int _disable_wakeup(struct omap_hwmod
*oh
)
334 if (!oh
->class->sysc
||
335 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
338 if (!oh
->class->sysc
->sysc_fields
) {
339 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
343 wakeup_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
347 _write_sysconfig(v
, oh
);
349 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
351 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
357 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
358 * @oh: struct omap_hwmod *
360 * Prevent the hardware module @oh from entering idle while the
361 * hardare module initiator @init_oh is active. Useful when a module
362 * will be accessed by a particular initiator (e.g., if a module will
363 * be accessed by the IVA, there should be a sleepdep between the IVA
364 * initiator and the module). Only applies to modules in smart-idle
365 * mode. Returns -EINVAL upon error or passes along
366 * clkdm_add_sleepdep() value upon success.
368 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
373 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
377 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
378 * @oh: struct omap_hwmod *
380 * Allow the hardware module @oh to enter idle while the hardare
381 * module initiator @init_oh is active. Useful when a module will not
382 * be accessed by a particular initiator (e.g., if a module will not
383 * be accessed by the IVA, there should be no sleepdep between the IVA
384 * initiator and the module). Only applies to modules in smart-idle
385 * mode. Returns -EINVAL upon error or passes along
386 * clkdm_del_sleepdep() value upon success.
388 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
393 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
397 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
398 * @oh: struct omap_hwmod *
400 * Called from _init_clocks(). Populates the @oh _clk (main
401 * functional clock pointer) if a main_clk is present. Returns 0 on
402 * success or -EINVAL on error.
404 static int _init_main_clk(struct omap_hwmod
*oh
)
411 oh
->_clk
= omap_clk_get_by_name(oh
->main_clk
);
413 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
414 oh
->name
, oh
->main_clk
);
417 if (!oh
->_clk
->clkdm
)
418 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
419 oh
->main_clk
, oh
->_clk
->name
);
425 * _init_interface_clk - get a struct clk * for the the hwmod's interface clks
426 * @oh: struct omap_hwmod *
428 * Called from _init_clocks(). Populates the @oh OCP slave interface
429 * clock pointers. Returns 0 on success or -EINVAL on error.
431 static int _init_interface_clks(struct omap_hwmod
*oh
)
437 if (oh
->slaves_cnt
== 0)
440 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
441 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
446 c
= omap_clk_get_by_name(os
->clk
);
448 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
458 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
459 * @oh: struct omap_hwmod *
461 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
462 * clock pointers. Returns 0 on success or -EINVAL on error.
464 static int _init_opt_clks(struct omap_hwmod
*oh
)
466 struct omap_hwmod_opt_clk
*oc
;
471 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
472 c
= omap_clk_get_by_name(oc
->clk
);
474 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
484 * _enable_clocks - enable hwmod main clock and interface clocks
485 * @oh: struct omap_hwmod *
487 * Enables all clocks necessary for register reads and writes to succeed
488 * on the hwmod @oh. Returns 0.
490 static int _enable_clocks(struct omap_hwmod
*oh
)
494 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
497 clk_enable(oh
->_clk
);
499 if (oh
->slaves_cnt
> 0) {
500 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
501 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
502 struct clk
*c
= os
->_clk
;
504 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
509 /* The opt clocks are controlled by the device driver. */
515 * _disable_clocks - disable hwmod main clock and interface clocks
516 * @oh: struct omap_hwmod *
518 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
520 static int _disable_clocks(struct omap_hwmod
*oh
)
524 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
527 clk_disable(oh
->_clk
);
529 if (oh
->slaves_cnt
> 0) {
530 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
531 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
532 struct clk
*c
= os
->_clk
;
534 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
539 /* The opt clocks are controlled by the device driver. */
545 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
546 * @oh: struct omap_hwmod *
548 * Returns the array index of the OCP slave port that the MPU
549 * addresses the device on, or -EINVAL upon error or not found.
551 static int _find_mpu_port_index(struct omap_hwmod
*oh
)
556 if (!oh
|| oh
->slaves_cnt
== 0)
559 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
560 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
562 if (os
->user
& OCP_USER_MPU
) {
569 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
572 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
575 return (found
) ? i
: -EINVAL
;
579 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
580 * @oh: struct omap_hwmod *
582 * Return the virtual address of the base of the register target of
583 * device @oh, or NULL on error.
585 static void __iomem
*_find_mpu_rt_base(struct omap_hwmod
*oh
, u8 index
)
587 struct omap_hwmod_ocp_if
*os
;
588 struct omap_hwmod_addr_space
*mem
;
591 void __iomem
*va_start
;
593 if (!oh
|| oh
->slaves_cnt
== 0)
596 os
= oh
->slaves
[index
];
598 for (i
= 0, mem
= os
->addr
; i
< os
->addr_cnt
; i
++, mem
++) {
599 if (mem
->flags
& ADDR_TYPE_RT
) {
606 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
608 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
611 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
614 pr_debug("omap_hwmod: %s: no MPU register target found\n",
618 return (found
) ? va_start
: NULL
;
622 * _sysc_enable - try to bring a module out of idle via OCP_SYSCONFIG
623 * @oh: struct omap_hwmod *
625 * If module is marked as SWSUP_SIDLE, force the module out of slave
626 * idle; otherwise, configure it for smart-idle. If module is marked
627 * as SWSUP_MSUSPEND, force the module out of master standby;
628 * otherwise, configure it for smart-standby. No return value.
630 static void _sysc_enable(struct omap_hwmod
*oh
)
635 if (!oh
->class->sysc
)
639 sf
= oh
->class->sysc
->sysc_flags
;
641 if (sf
& SYSC_HAS_SIDLEMODE
) {
642 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
643 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
644 _set_slave_idlemode(oh
, idlemode
, &v
);
647 if (sf
& SYSC_HAS_MIDLEMODE
) {
648 idlemode
= (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ?
649 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
650 _set_master_standbymode(oh
, idlemode
, &v
);
653 if (sf
& SYSC_HAS_AUTOIDLE
) {
654 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
656 _set_module_autoidle(oh
, idlemode
, &v
);
659 /* XXX OCP ENAWAKEUP bit? */
662 * XXX The clock framework should handle this, by
663 * calling into this code. But this must wait until the
664 * clock structures are tagged with omap_hwmod entries
666 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
667 (sf
& SYSC_HAS_CLOCKACTIVITY
))
668 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
670 _write_sysconfig(v
, oh
);
674 * _sysc_idle - try to put a module into idle via OCP_SYSCONFIG
675 * @oh: struct omap_hwmod *
677 * If module is marked as SWSUP_SIDLE, force the module into slave
678 * idle; otherwise, configure it for smart-idle. If module is marked
679 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
680 * configure it for smart-standby. No return value.
682 static void _sysc_idle(struct omap_hwmod
*oh
)
687 if (!oh
->class->sysc
)
691 sf
= oh
->class->sysc
->sysc_flags
;
693 if (sf
& SYSC_HAS_SIDLEMODE
) {
694 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
695 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
696 _set_slave_idlemode(oh
, idlemode
, &v
);
699 if (sf
& SYSC_HAS_MIDLEMODE
) {
700 idlemode
= (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ?
701 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
702 _set_master_standbymode(oh
, idlemode
, &v
);
705 _write_sysconfig(v
, oh
);
709 * _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
710 * @oh: struct omap_hwmod *
712 * Force the module into slave idle and master suspend. No return
715 static void _sysc_shutdown(struct omap_hwmod
*oh
)
720 if (!oh
->class->sysc
)
724 sf
= oh
->class->sysc
->sysc_flags
;
726 if (sf
& SYSC_HAS_SIDLEMODE
)
727 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
729 if (sf
& SYSC_HAS_MIDLEMODE
)
730 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
732 if (sf
& SYSC_HAS_AUTOIDLE
)
733 _set_module_autoidle(oh
, 1, &v
);
735 _write_sysconfig(v
, oh
);
739 * _lookup - find an omap_hwmod by name
740 * @name: find an omap_hwmod by name
742 * Return a pointer to an omap_hwmod by name, or NULL if not found.
743 * Caller must hold omap_hwmod_mutex.
745 static struct omap_hwmod
*_lookup(const char *name
)
747 struct omap_hwmod
*oh
, *temp_oh
;
751 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
752 if (!strcmp(name
, temp_oh
->name
)) {
762 * _init_clocks - clk_get() all clocks associated with this hwmod
763 * @oh: struct omap_hwmod *
765 * Called by omap_hwmod_late_init() (after omap2_clk_init()).
766 * Resolves all clock names embedded in the hwmod. Must be called
767 * with omap_hwmod_mutex held. Returns -EINVAL if the omap_hwmod
768 * has not yet been registered or if the clocks have already been
769 * initialized, 0 on success, or a non-zero error on failure.
771 static int _init_clocks(struct omap_hwmod
*oh
)
775 if (!oh
|| (oh
->_state
!= _HWMOD_STATE_REGISTERED
))
778 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
780 ret
|= _init_main_clk(oh
);
781 ret
|= _init_interface_clks(oh
);
782 ret
|= _init_opt_clks(oh
);
785 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
791 * _wait_target_ready - wait for a module to leave slave idle
792 * @oh: struct omap_hwmod *
794 * Wait for a module @oh to leave slave idle. Returns 0 if the module
795 * does not have an IDLEST bit or if the module successfully leaves
796 * slave idle; otherwise, pass along the return value of the
797 * appropriate *_cm_wait_module_ready() function.
799 static int _wait_target_ready(struct omap_hwmod
*oh
)
801 struct omap_hwmod_ocp_if
*os
;
807 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
810 os
= oh
->slaves
[oh
->_mpu_port_index
];
812 if (oh
->flags
& HWMOD_NO_IDLEST
)
815 /* XXX check module SIDLEMODE */
817 /* XXX check clock enable states */
819 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
820 ret
= omap2_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
821 oh
->prcm
.omap2
.idlest_reg_id
,
822 oh
->prcm
.omap2
.idlest_idle_bit
);
823 } else if (cpu_is_omap44xx()) {
824 ret
= omap4_cm_wait_module_ready(oh
->prcm
.omap4
.clkctrl_reg
);
833 * _reset - reset an omap_hwmod
834 * @oh: struct omap_hwmod *
836 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
837 * enabled for this to work. Must be called with omap_hwmod_mutex
838 * held. Returns -EINVAL if the hwmod cannot be reset this way or if
839 * the hwmod is in the wrong state, -ETIMEDOUT if the module did not
840 * reset in time, or 0 upon success.
842 static int _reset(struct omap_hwmod
*oh
)
847 if (!oh
->class->sysc
||
848 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
) ||
849 (oh
->class->sysc
->sysc_flags
& SYSS_MISSING
))
852 /* clocks must be on for this operation */
853 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
854 WARN(1, "omap_hwmod: %s: reset can only be entered from "
855 "enabled state\n", oh
->name
);
859 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
862 r
= _set_softreset(oh
, &v
);
865 _write_sysconfig(v
, oh
);
867 omap_test_timeout((omap_hwmod_readl(oh
, oh
->class->sysc
->syss_offs
) &
868 SYSS_RESETDONE_MASK
),
869 MAX_MODULE_RESET_WAIT
, c
);
871 if (c
== MAX_MODULE_RESET_WAIT
)
872 WARN(1, "omap_hwmod: %s: failed to reset in %d usec\n",
873 oh
->name
, MAX_MODULE_RESET_WAIT
);
875 pr_debug("omap_hwmod: %s: reset in %d usec\n", oh
->name
, c
);
878 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
879 * _wait_target_ready() or _reset()
882 return (c
== MAX_MODULE_RESET_WAIT
) ? -ETIMEDOUT
: 0;
886 * _enable - enable an omap_hwmod
887 * @oh: struct omap_hwmod *
889 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
890 * register target. Must be called with omap_hwmod_mutex held.
891 * Returns -EINVAL if the hwmod is in the wrong state or passes along
892 * the return value of _wait_target_ready().
894 static int _enable(struct omap_hwmod
*oh
)
898 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
899 oh
->_state
!= _HWMOD_STATE_IDLE
&&
900 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
901 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
902 "from initialized, idle, or disabled state\n", oh
->name
);
906 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
910 _add_initiator_dep(oh
, mpu_oh
);
913 r
= _wait_target_ready(oh
);
915 oh
->_state
= _HWMOD_STATE_ENABLED
;
917 /* Access the sysconfig only if the target is ready */
918 if (oh
->class->sysc
) {
919 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
920 _update_sysc_cache(oh
);
924 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
932 * _idle - idle an omap_hwmod
933 * @oh: struct omap_hwmod *
935 * Idles an omap_hwmod @oh. This should be called once the hwmod has
936 * no further work. Returns -EINVAL if the hwmod is in the wrong
937 * state or returns 0.
939 static int _idle(struct omap_hwmod
*oh
)
941 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
942 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
943 "enabled state\n", oh
->name
);
947 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
951 _del_initiator_dep(oh
, mpu_oh
);
954 oh
->_state
= _HWMOD_STATE_IDLE
;
960 * _shutdown - shutdown an omap_hwmod
961 * @oh: struct omap_hwmod *
963 * Shut down an omap_hwmod @oh. This should be called when the driver
964 * used for the hwmod is removed or unloaded or if the driver is not
965 * used by the system. Returns -EINVAL if the hwmod is in the wrong
966 * state or returns 0.
968 static int _shutdown(struct omap_hwmod
*oh
)
970 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
971 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
972 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
973 "from idle, or enabled state\n", oh
->name
);
977 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
981 _del_initiator_dep(oh
, mpu_oh
);
982 /* XXX what about the other system initiators here? DMA, tesla, d2d */
984 /* XXX Should this code also force-disable the optional clocks? */
986 /* XXX mux any associated balls to safe mode */
988 oh
->_state
= _HWMOD_STATE_DISABLED
;
994 * _setup - do initial configuration of omap_hwmod
995 * @oh: struct omap_hwmod *
997 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
998 * OCP_SYSCONFIG register. Must be called with omap_hwmod_mutex
999 * held. Returns -EINVAL if the hwmod is in the wrong state or returns
1002 static int _setup(struct omap_hwmod
*oh
)
1009 /* Set iclk autoidle mode */
1010 if (oh
->slaves_cnt
> 0) {
1011 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1012 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
1013 struct clk
*c
= os
->_clk
;
1018 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
1019 /* XXX omap_iclk_deny_idle(c); */
1021 /* XXX omap_iclk_allow_idle(c); */
1027 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
1031 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1032 oh
->name
, oh
->_state
);
1036 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
)) {
1038 * XXX Do the OCP_SYSCONFIG bits need to be
1039 * reprogrammed after a reset? If not, then this can
1040 * be removed. If they do, then probably the
1041 * _enable() function should be split to avoid the
1042 * rewrite of the OCP_SYSCONFIG register.
1044 if (oh
->class->sysc
) {
1045 _update_sysc_cache(oh
);
1050 if (!(oh
->flags
& HWMOD_INIT_NO_IDLE
))
1058 /* Public functions */
1060 u32
omap_hwmod_readl(struct omap_hwmod
*oh
, u16 reg_offs
)
1062 return __raw_readl(oh
->_rt_va
+ reg_offs
);
1065 void omap_hwmod_writel(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
1067 __raw_writel(v
, oh
->_rt_va
+ reg_offs
);
1070 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
1078 v
= oh
->_sysc_cache
;
1080 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
1082 _write_sysconfig(v
, oh
);
1088 * omap_hwmod_register - register a struct omap_hwmod
1089 * @oh: struct omap_hwmod *
1091 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1092 * already has been registered by the same name; -EINVAL if the
1093 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1094 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1095 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1098 * XXX The data should be copied into bootmem, so the original data
1099 * should be marked __initdata and freed after init. This would allow
1100 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1101 * that the copy process would be relatively complex due to the large number
1104 int omap_hwmod_register(struct omap_hwmod
*oh
)
1108 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
1109 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
1112 mutex_lock(&omap_hwmod_mutex
);
1114 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
1116 if (_lookup(oh
->name
)) {
1121 ms_id
= _find_mpu_port_index(oh
);
1122 if (!IS_ERR_VALUE(ms_id
)) {
1123 oh
->_mpu_port_index
= ms_id
;
1124 oh
->_rt_va
= _find_mpu_rt_base(oh
, oh
->_mpu_port_index
);
1126 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1129 list_add_tail(&oh
->node
, &omap_hwmod_list
);
1131 oh
->_state
= _HWMOD_STATE_REGISTERED
;
1136 mutex_unlock(&omap_hwmod_mutex
);
1141 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1142 * @name: name of the omap_hwmod to look up
1144 * Given a @name of an omap_hwmod, return a pointer to the registered
1145 * struct omap_hwmod *, or NULL upon error.
1147 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
1149 struct omap_hwmod
*oh
;
1154 mutex_lock(&omap_hwmod_mutex
);
1156 mutex_unlock(&omap_hwmod_mutex
);
1162 * omap_hwmod_for_each - call function for each registered omap_hwmod
1163 * @fn: pointer to a callback function
1165 * Call @fn for each registered omap_hwmod, passing @data to each
1166 * function. @fn must return 0 for success or any other value for
1167 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1168 * will stop and the non-zero return value will be passed to the
1169 * caller of omap_hwmod_for_each(). @fn is called with
1170 * omap_hwmod_for_each() held.
1172 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
))
1174 struct omap_hwmod
*temp_oh
;
1180 mutex_lock(&omap_hwmod_mutex
);
1181 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1182 ret
= (*fn
)(temp_oh
);
1186 mutex_unlock(&omap_hwmod_mutex
);
1193 * omap_hwmod_init - init omap_hwmod code and register hwmods
1194 * @ohs: pointer to an array of omap_hwmods to register
1196 * Intended to be called early in boot before the clock framework is
1197 * initialized. If @ohs is not null, will register all omap_hwmods
1198 * listed in @ohs that are valid for this chip. Returns -EINVAL if
1199 * omap_hwmod_init() has already been called or 0 otherwise.
1201 int omap_hwmod_init(struct omap_hwmod
**ohs
)
1203 struct omap_hwmod
*oh
;
1216 if (omap_chip_is(oh
->omap_chip
)) {
1217 r
= omap_hwmod_register(oh
);
1218 WARN(r
, "omap_hwmod: %s: omap_hwmod_register returned "
1219 "%d\n", oh
->name
, r
);
1228 * omap_hwmod_late_init - do some post-clock framework initialization
1230 * Must be called after omap2_clk_init(). Resolves the struct clk names
1231 * to struct clk pointers for each registered omap_hwmod. Also calls
1232 * _setup() on each hwmod. Returns 0.
1234 int omap_hwmod_late_init(void)
1238 /* XXX check return value */
1239 r
= omap_hwmod_for_each(_init_clocks
);
1240 WARN(r
, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n");
1242 mpu_oh
= omap_hwmod_lookup(MPU_INITIATOR_NAME
);
1243 WARN(!mpu_oh
, "omap_hwmod: could not find MPU initiator hwmod %s\n",
1244 MPU_INITIATOR_NAME
);
1246 omap_hwmod_for_each(_setup
);
1252 * omap_hwmod_unregister - unregister an omap_hwmod
1253 * @oh: struct omap_hwmod *
1255 * Unregisters a previously-registered omap_hwmod @oh. There's probably
1256 * no use case for this, so it is likely to be removed in a later version.
1258 * XXX Free all of the bootmem-allocated structures here when that is
1259 * implemented. Make it clear that core code is the only code that is
1260 * expected to unregister modules.
1262 int omap_hwmod_unregister(struct omap_hwmod
*oh
)
1267 pr_debug("omap_hwmod: %s: unregistering\n", oh
->name
);
1269 mutex_lock(&omap_hwmod_mutex
);
1270 iounmap(oh
->_rt_va
);
1271 list_del(&oh
->node
);
1272 mutex_unlock(&omap_hwmod_mutex
);
1278 * omap_hwmod_enable - enable an omap_hwmod
1279 * @oh: struct omap_hwmod *
1281 * Enable an omap_hwomd @oh. Intended to be called by omap_device_enable().
1282 * Returns -EINVAL on error or passes along the return value from _enable().
1284 int omap_hwmod_enable(struct omap_hwmod
*oh
)
1291 mutex_lock(&omap_hwmod_mutex
);
1293 mutex_unlock(&omap_hwmod_mutex
);
1299 * omap_hwmod_idle - idle an omap_hwmod
1300 * @oh: struct omap_hwmod *
1302 * Idle an omap_hwomd @oh. Intended to be called by omap_device_idle().
1303 * Returns -EINVAL on error or passes along the return value from _idle().
1305 int omap_hwmod_idle(struct omap_hwmod
*oh
)
1310 mutex_lock(&omap_hwmod_mutex
);
1312 mutex_unlock(&omap_hwmod_mutex
);
1318 * omap_hwmod_shutdown - shutdown an omap_hwmod
1319 * @oh: struct omap_hwmod *
1321 * Shutdown an omap_hwomd @oh. Intended to be called by
1322 * omap_device_shutdown(). Returns -EINVAL on error or passes along
1323 * the return value from _shutdown().
1325 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
1330 mutex_lock(&omap_hwmod_mutex
);
1332 mutex_unlock(&omap_hwmod_mutex
);
1338 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
1339 * @oh: struct omap_hwmod *oh
1341 * Intended to be called by the omap_device code.
1343 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
1345 mutex_lock(&omap_hwmod_mutex
);
1347 mutex_unlock(&omap_hwmod_mutex
);
1353 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
1354 * @oh: struct omap_hwmod *oh
1356 * Intended to be called by the omap_device code.
1358 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
1360 mutex_lock(&omap_hwmod_mutex
);
1361 _disable_clocks(oh
);
1362 mutex_unlock(&omap_hwmod_mutex
);
1368 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
1369 * @oh: struct omap_hwmod *oh
1371 * Intended to be called by drivers and core code when all posted
1372 * writes to a device must complete before continuing further
1373 * execution (for example, after clearing some device IRQSTATUS
1376 * XXX what about targets with multiple OCP threads?
1378 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
1382 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
1383 WARN(1, "omap_device: %s: OCP barrier impossible due to "
1384 "device configuration\n", oh
->name
);
1389 * Forces posted writes to complete on the OCP thread handling
1392 omap_hwmod_readl(oh
, oh
->class->sysc
->sysc_offs
);
1396 * omap_hwmod_reset - reset the hwmod
1397 * @oh: struct omap_hwmod *
1399 * Under some conditions, a driver may wish to reset the entire device.
1400 * Called from omap_device code. Returns -EINVAL on error or passes along
1401 * the return value from _reset()/_enable().
1403 int omap_hwmod_reset(struct omap_hwmod
*oh
)
1407 if (!oh
|| !(oh
->_state
& _HWMOD_STATE_ENABLED
))
1410 mutex_lock(&omap_hwmod_mutex
);
1414 mutex_unlock(&omap_hwmod_mutex
);
1420 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
1421 * @oh: struct omap_hwmod *
1422 * @res: pointer to the first element of an array of struct resource to fill
1424 * Count the number of struct resource array elements necessary to
1425 * contain omap_hwmod @oh resources. Intended to be called by code
1426 * that registers omap_devices. Intended to be used to determine the
1427 * size of a dynamically-allocated struct resource array, before
1428 * calling omap_hwmod_fill_resources(). Returns the number of struct
1429 * resource array elements needed.
1431 * XXX This code is not optimized. It could attempt to merge adjacent
1435 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
1439 ret
= oh
->mpu_irqs_cnt
+ oh
->sdma_chs_cnt
;
1441 for (i
= 0; i
< oh
->slaves_cnt
; i
++)
1442 ret
+= oh
->slaves
[i
]->addr_cnt
;
1448 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
1449 * @oh: struct omap_hwmod *
1450 * @res: pointer to the first element of an array of struct resource to fill
1452 * Fill the struct resource array @res with resource data from the
1453 * omap_hwmod @oh. Intended to be called by code that registers
1454 * omap_devices. See also omap_hwmod_count_resources(). Returns the
1455 * number of array elements filled.
1457 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
1462 /* For each IRQ, DMA, memory area, fill in array.*/
1464 for (i
= 0; i
< oh
->mpu_irqs_cnt
; i
++) {
1465 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
1466 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
1467 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
1468 (res
+ r
)->flags
= IORESOURCE_IRQ
;
1472 for (i
= 0; i
< oh
->sdma_chs_cnt
; i
++) {
1473 (res
+ r
)->name
= (oh
->sdma_chs
+ i
)->name
;
1474 (res
+ r
)->start
= (oh
->sdma_chs
+ i
)->dma_ch
;
1475 (res
+ r
)->end
= (oh
->sdma_chs
+ i
)->dma_ch
;
1476 (res
+ r
)->flags
= IORESOURCE_DMA
;
1480 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1481 struct omap_hwmod_ocp_if
*os
;
1485 for (j
= 0; j
< os
->addr_cnt
; j
++) {
1486 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
1487 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
1488 (res
+ r
)->flags
= IORESOURCE_MEM
;
1497 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
1498 * @oh: struct omap_hwmod *
1500 * Return the powerdomain pointer associated with the OMAP module
1501 * @oh's main clock. If @oh does not have a main clk, return the
1502 * powerdomain associated with the interface clock associated with the
1503 * module's MPU port. (XXX Perhaps this should use the SDMA port
1504 * instead?) Returns NULL on error, or a struct powerdomain * on
1507 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
1517 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1519 c
= oh
->slaves
[oh
->_mpu_port_index
]->_clk
;
1525 return c
->clkdm
->pwrdm
.ptr
;
1530 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
1531 * @oh: struct omap_hwmod *
1532 * @init_oh: struct omap_hwmod * (initiator)
1534 * Add a sleep dependency between the initiator @init_oh and @oh.
1535 * Intended to be called by DSP/Bridge code via platform_data for the
1536 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
1537 * code needs to add/del initiator dependencies dynamically
1538 * before/after accessing a device. Returns the return value from
1539 * _add_initiator_dep().
1541 * XXX Keep a usecount in the clockdomain code
1543 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
1544 struct omap_hwmod
*init_oh
)
1546 return _add_initiator_dep(oh
, init_oh
);
1550 * XXX what about functions for drivers to save/restore ocp_sysconfig
1551 * for context save/restore operations?
1555 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
1556 * @oh: struct omap_hwmod *
1557 * @init_oh: struct omap_hwmod * (initiator)
1559 * Remove a sleep dependency between the initiator @init_oh and @oh.
1560 * Intended to be called by DSP/Bridge code via platform_data for the
1561 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
1562 * code needs to add/del initiator dependencies dynamically
1563 * before/after accessing a device. Returns the return value from
1564 * _del_initiator_dep().
1566 * XXX Keep a usecount in the clockdomain code
1568 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
1569 struct omap_hwmod
*init_oh
)
1571 return _del_initiator_dep(oh
, init_oh
);
1575 * omap_hwmod_enable_wakeup - allow device to wake up the system
1576 * @oh: struct omap_hwmod *
1578 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
1579 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
1580 * registers to cause the PRCM to receive wakeup events from the
1581 * module. Does not set any wakeup routing registers beyond this
1582 * point - if the module is to wake up any other module or subsystem,
1583 * that must be set separately. Called by omap_device code. Returns
1584 * -EINVAL on error or 0 upon success.
1586 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
1588 if (!oh
->class->sysc
||
1589 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
1592 mutex_lock(&omap_hwmod_mutex
);
1594 mutex_unlock(&omap_hwmod_mutex
);
1600 * omap_hwmod_disable_wakeup - prevent device from waking the system
1601 * @oh: struct omap_hwmod *
1603 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
1604 * from sending wakeups to the PRCM. Eventually this should clear
1605 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
1606 * from the module. Does not set any wakeup routing registers beyond
1607 * this point - if the module is to wake up any other module or
1608 * subsystem, that must be set separately. Called by omap_device
1609 * code. Returns -EINVAL on error or 0 upon success.
1611 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
1613 if (!oh
->class->sysc
||
1614 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
1617 mutex_lock(&omap_hwmod_mutex
);
1618 _disable_wakeup(oh
);
1619 mutex_unlock(&omap_hwmod_mutex
);
1625 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
1626 * @classname: struct omap_hwmod_class name to search for
1627 * @fn: callback function pointer to call for each hwmod in class @classname
1628 * @user: arbitrary context data to pass to the callback function
1630 * For each omap_hwmod of class @classname, call @fn. Takes
1631 * omap_hwmod_mutex to prevent the hwmod list from changing during the
1632 * iteration. If the callback function returns something other than
1633 * zero, the iterator is terminated, and the callback function's return
1634 * value is passed back to the caller. Returns 0 upon success, -EINVAL
1635 * if @classname or @fn are NULL, or passes back the error code from @fn.
1637 int omap_hwmod_for_each_by_class(const char *classname
,
1638 int (*fn
)(struct omap_hwmod
*oh
,
1642 struct omap_hwmod
*temp_oh
;
1645 if (!classname
|| !fn
)
1648 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
1649 __func__
, classname
);
1651 mutex_lock(&omap_hwmod_mutex
);
1653 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1654 if (!strcmp(temp_oh
->class->name
, classname
)) {
1655 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
1656 __func__
, temp_oh
->name
);
1657 ret
= (*fn
)(temp_oh
, user
);
1663 mutex_unlock(&omap_hwmod_mutex
);
1666 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",