2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009 Nokia Corporation
6 * With fixes and testing from Kevin Hilman
8 * Created in collaboration with (alphabetical order): Benoit Cousson,
9 * Kevin Hilman, Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari
10 * Poussa, Anand 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>
46 #include <linux/bootmem.h>
48 #include <plat/common.h>
50 #include <plat/clockdomain.h>
51 #include <plat/powerdomain.h>
52 #include <plat/clock.h>
53 #include <plat/omap_hwmod.h>
57 /* Maximum microseconds to wait for OMAP module to reset */
58 #define MAX_MODULE_RESET_WAIT 10000
60 /* Name of the OMAP hwmod for the MPU */
61 #define MPU_INITIATOR_NAME "mpu_hwmod"
63 /* omap_hwmod_list contains all registered struct omap_hwmods */
64 static LIST_HEAD(omap_hwmod_list
);
66 static DEFINE_MUTEX(omap_hwmod_mutex
);
68 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
69 static struct omap_hwmod
*mpu_oh
;
71 /* inited: 0 if omap_hwmod_init() has not yet been called; 1 otherwise */
75 /* Private functions */
78 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
79 * @oh: struct omap_hwmod *
81 * Load the current value of the hwmod OCP_SYSCONFIG register into the
82 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
83 * OCP_SYSCONFIG register or 0 upon success.
85 static int _update_sysc_cache(struct omap_hwmod
*oh
)
87 if (!oh
->class->sysc
) {
88 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
92 /* XXX ensure module interface clock is up */
94 oh
->_sysc_cache
= omap_hwmod_readl(oh
, oh
->class->sysc
->sysc_offs
);
96 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
97 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
103 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
104 * @v: OCP_SYSCONFIG value to write
105 * @oh: struct omap_hwmod *
107 * Write @v into the module class' OCP_SYSCONFIG register, if it has
108 * one. No return value.
110 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
112 if (!oh
->class->sysc
) {
113 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
117 /* XXX ensure module interface clock is up */
119 if (oh
->_sysc_cache
!= v
) {
121 omap_hwmod_writel(v
, oh
, oh
->class->sysc
->sysc_offs
);
126 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
127 * @oh: struct omap_hwmod *
128 * @standbymode: MIDLEMODE field bits
129 * @v: pointer to register contents to modify
131 * Update the master standby mode bits in @v to be @standbymode for
132 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
133 * upon error or 0 upon success.
135 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
141 if (!oh
->class->sysc
||
142 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
145 if (!oh
->class->sysc
->sysc_fields
) {
146 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
150 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
151 mstandby_mask
= (0x3 << mstandby_shift
);
153 *v
&= ~mstandby_mask
;
154 *v
|= __ffs(standbymode
) << mstandby_shift
;
160 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
161 * @oh: struct omap_hwmod *
162 * @idlemode: SIDLEMODE field bits
163 * @v: pointer to register contents to modify
165 * Update the slave idle mode bits in @v to be @idlemode for the @oh
166 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
169 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
174 if (!oh
->class->sysc
||
175 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
178 if (!oh
->class->sysc
->sysc_fields
) {
179 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
183 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
184 sidle_mask
= (0x3 << sidle_shift
);
187 *v
|= __ffs(idlemode
) << sidle_shift
;
193 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
194 * @oh: struct omap_hwmod *
195 * @clockact: CLOCKACTIVITY field bits
196 * @v: pointer to register contents to modify
198 * Update the clockactivity mode bits in @v to be @clockact for the
199 * @oh hwmod. Used for additional powersaving on some modules. Does
200 * not write to the hardware. Returns -EINVAL upon error or 0 upon
203 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
208 if (!oh
->class->sysc
||
209 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
212 if (!oh
->class->sysc
->sysc_fields
) {
213 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
217 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
218 clkact_mask
= (0x3 << clkact_shift
);
221 *v
|= clockact
<< clkact_shift
;
227 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
228 * @oh: struct omap_hwmod *
229 * @v: pointer to register contents to modify
231 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
232 * error or 0 upon success.
234 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
238 if (!oh
->class->sysc
||
239 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
242 if (!oh
->class->sysc
->sysc_fields
) {
243 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
247 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
255 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
256 * @oh: struct omap_hwmod *
257 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
258 * @v: pointer to register contents to modify
260 * Update the module autoidle bit in @v to be @autoidle for the @oh
261 * hwmod. The autoidle bit controls whether the module can gate
262 * internal clocks automatically when it isn't doing anything; the
263 * exact function of this bit varies on a per-module basis. This
264 * function does not write to the hardware. Returns -EINVAL upon
265 * error or 0 upon success.
267 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
273 if (!oh
->class->sysc
||
274 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
277 if (!oh
->class->sysc
->sysc_fields
) {
278 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
282 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
283 autoidle_mask
= (0x3 << autoidle_shift
);
285 *v
&= ~autoidle_mask
;
286 *v
|= autoidle
<< autoidle_shift
;
292 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
293 * @oh: struct omap_hwmod *
295 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
296 * upon error or 0 upon success.
298 static int _enable_wakeup(struct omap_hwmod
*oh
)
302 if (!oh
->class->sysc
||
303 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
306 if (!oh
->class->sysc
->sysc_fields
) {
307 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
311 wakeup_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
315 _write_sysconfig(v
, oh
);
317 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
319 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
325 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
326 * @oh: struct omap_hwmod *
328 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
329 * upon error or 0 upon success.
331 static int _disable_wakeup(struct omap_hwmod
*oh
)
335 if (!oh
->class->sysc
||
336 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
339 if (!oh
->class->sysc
->sysc_fields
) {
340 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
344 wakeup_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
348 _write_sysconfig(v
, oh
);
350 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
352 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
358 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
359 * @oh: struct omap_hwmod *
361 * Prevent the hardware module @oh from entering idle while the
362 * hardare module initiator @init_oh is active. Useful when a module
363 * will be accessed by a particular initiator (e.g., if a module will
364 * be accessed by the IVA, there should be a sleepdep between the IVA
365 * initiator and the module). Only applies to modules in smart-idle
366 * mode. Returns -EINVAL upon error or passes along
367 * clkdm_add_sleepdep() value upon success.
369 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
374 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
378 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
379 * @oh: struct omap_hwmod *
381 * Allow the hardware module @oh to enter idle while the hardare
382 * module initiator @init_oh is active. Useful when a module will not
383 * be accessed by a particular initiator (e.g., if a module will not
384 * be accessed by the IVA, there should be no sleepdep between the IVA
385 * initiator and the module). Only applies to modules in smart-idle
386 * mode. Returns -EINVAL upon error or passes along
387 * clkdm_del_sleepdep() value upon success.
389 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
394 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
398 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
399 * @oh: struct omap_hwmod *
401 * Called from _init_clocks(). Populates the @oh _clk (main
402 * functional clock pointer) if a main_clk is present. Returns 0 on
403 * success or -EINVAL on error.
405 static int _init_main_clk(struct omap_hwmod
*oh
)
413 c
= omap_clk_get_by_name(oh
->main_clk
);
415 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
416 oh
->name
, oh
->main_clk
);
420 WARN(!c
->clkdm
, "omap_hwmod: %s: missing clockdomain for %s.\n",
421 oh
->main_clk
, c
->name
);
427 * _init_interface_clk - get a struct clk * for the the hwmod's interface clks
428 * @oh: struct omap_hwmod *
430 * Called from _init_clocks(). Populates the @oh OCP slave interface
431 * clock pointers. Returns 0 on success or -EINVAL on error.
433 static int _init_interface_clks(struct omap_hwmod
*oh
)
439 if (oh
->slaves_cnt
== 0)
442 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
443 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
448 c
= omap_clk_get_by_name(os
->clk
);
450 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
460 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
461 * @oh: struct omap_hwmod *
463 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
464 * clock pointers. Returns 0 on success or -EINVAL on error.
466 static int _init_opt_clks(struct omap_hwmod
*oh
)
468 struct omap_hwmod_opt_clk
*oc
;
473 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
474 c
= omap_clk_get_by_name(oc
->clk
);
476 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
486 * _enable_clocks - enable hwmod main clock and interface clocks
487 * @oh: struct omap_hwmod *
489 * Enables all clocks necessary for register reads and writes to succeed
490 * on the hwmod @oh. Returns 0.
492 static int _enable_clocks(struct omap_hwmod
*oh
)
496 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
499 clk_enable(oh
->_clk
);
501 if (oh
->slaves_cnt
> 0) {
502 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
503 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
504 struct clk
*c
= os
->_clk
;
506 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
511 /* The opt clocks are controlled by the device driver. */
517 * _disable_clocks - disable hwmod main clock and interface clocks
518 * @oh: struct omap_hwmod *
520 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
522 static int _disable_clocks(struct omap_hwmod
*oh
)
526 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
529 clk_disable(oh
->_clk
);
531 if (oh
->slaves_cnt
> 0) {
532 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
533 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
534 struct clk
*c
= os
->_clk
;
536 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
541 /* The opt clocks are controlled by the device driver. */
547 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
548 * @oh: struct omap_hwmod *
550 * Returns the array index of the OCP slave port that the MPU
551 * addresses the device on, or -EINVAL upon error or not found.
553 static int _find_mpu_port_index(struct omap_hwmod
*oh
)
558 if (!oh
|| oh
->slaves_cnt
== 0)
561 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
562 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
564 if (os
->user
& OCP_USER_MPU
) {
571 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
574 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
577 return (found
) ? i
: -EINVAL
;
581 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
582 * @oh: struct omap_hwmod *
584 * Return the virtual address of the base of the register target of
585 * device @oh, or NULL on error.
587 static void __iomem
*_find_mpu_rt_base(struct omap_hwmod
*oh
, u8 index
)
589 struct omap_hwmod_ocp_if
*os
;
590 struct omap_hwmod_addr_space
*mem
;
593 void __iomem
*va_start
;
595 if (!oh
|| oh
->slaves_cnt
== 0)
598 os
= oh
->slaves
[index
];
600 for (i
= 0, mem
= os
->addr
; i
< os
->addr_cnt
; i
++, mem
++) {
601 if (mem
->flags
& ADDR_TYPE_RT
) {
608 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
610 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
613 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
616 pr_debug("omap_hwmod: %s: no MPU register target found\n",
620 return (found
) ? va_start
: NULL
;
624 * _sysc_enable - try to bring a module out of idle via OCP_SYSCONFIG
625 * @oh: struct omap_hwmod *
627 * If module is marked as SWSUP_SIDLE, force the module out of slave
628 * idle; otherwise, configure it for smart-idle. If module is marked
629 * as SWSUP_MSUSPEND, force the module out of master standby;
630 * otherwise, configure it for smart-standby. No return value.
632 static void _sysc_enable(struct omap_hwmod
*oh
)
637 if (!oh
->class->sysc
)
641 sf
= oh
->class->sysc
->sysc_flags
;
643 if (sf
& SYSC_HAS_SIDLEMODE
) {
644 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
645 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
646 _set_slave_idlemode(oh
, idlemode
, &v
);
649 if (sf
& SYSC_HAS_MIDLEMODE
) {
650 idlemode
= (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ?
651 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
652 _set_master_standbymode(oh
, idlemode
, &v
);
655 if (sf
& SYSC_HAS_AUTOIDLE
) {
656 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
658 _set_module_autoidle(oh
, idlemode
, &v
);
661 /* XXX OCP ENAWAKEUP bit? */
664 * XXX The clock framework should handle this, by
665 * calling into this code. But this must wait until the
666 * clock structures are tagged with omap_hwmod entries
668 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
669 (sf
& SYSC_HAS_CLOCKACTIVITY
))
670 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
672 _write_sysconfig(v
, oh
);
676 * _sysc_idle - try to put a module into idle via OCP_SYSCONFIG
677 * @oh: struct omap_hwmod *
679 * If module is marked as SWSUP_SIDLE, force the module into slave
680 * idle; otherwise, configure it for smart-idle. If module is marked
681 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
682 * configure it for smart-standby. No return value.
684 static void _sysc_idle(struct omap_hwmod
*oh
)
689 if (!oh
->class->sysc
)
693 sf
= oh
->class->sysc
->sysc_flags
;
695 if (sf
& SYSC_HAS_SIDLEMODE
) {
696 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
697 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
698 _set_slave_idlemode(oh
, idlemode
, &v
);
701 if (sf
& SYSC_HAS_MIDLEMODE
) {
702 idlemode
= (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ?
703 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
704 _set_master_standbymode(oh
, idlemode
, &v
);
707 _write_sysconfig(v
, oh
);
711 * _sysc_shutdown - force a module into idle via OCP_SYSCONFIG
712 * @oh: struct omap_hwmod *
714 * Force the module into slave idle and master suspend. No return
717 static void _sysc_shutdown(struct omap_hwmod
*oh
)
722 if (!oh
->class->sysc
)
726 sf
= oh
->class->sysc
->sysc_flags
;
728 if (sf
& SYSC_HAS_SIDLEMODE
)
729 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
731 if (sf
& SYSC_HAS_MIDLEMODE
)
732 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
734 if (sf
& SYSC_HAS_AUTOIDLE
)
735 _set_module_autoidle(oh
, 1, &v
);
737 _write_sysconfig(v
, oh
);
741 * _lookup - find an omap_hwmod by name
742 * @name: find an omap_hwmod by name
744 * Return a pointer to an omap_hwmod by name, or NULL if not found.
745 * Caller must hold omap_hwmod_mutex.
747 static struct omap_hwmod
*_lookup(const char *name
)
749 struct omap_hwmod
*oh
, *temp_oh
;
753 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
754 if (!strcmp(name
, temp_oh
->name
)) {
764 * _init_clocks - clk_get() all clocks associated with this hwmod
765 * @oh: struct omap_hwmod *
767 * Called by omap_hwmod_late_init() (after omap2_clk_init()).
768 * Resolves all clock names embedded in the hwmod. Must be called
769 * with omap_hwmod_mutex held. Returns -EINVAL if the omap_hwmod
770 * has not yet been registered or if the clocks have already been
771 * initialized, 0 on success, or a non-zero error on failure.
773 static int _init_clocks(struct omap_hwmod
*oh
)
777 if (!oh
|| (oh
->_state
!= _HWMOD_STATE_REGISTERED
))
780 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
782 ret
|= _init_main_clk(oh
);
783 ret
|= _init_interface_clks(oh
);
784 ret
|= _init_opt_clks(oh
);
786 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
792 * _wait_target_ready - wait for a module to leave slave idle
793 * @oh: struct omap_hwmod *
795 * Wait for a module @oh to leave slave idle. Returns 0 if the module
796 * does not have an IDLEST bit or if the module successfully leaves
797 * slave idle; otherwise, pass along the return value of the
798 * appropriate *_cm_wait_module_ready() function.
800 static int _wait_target_ready(struct omap_hwmod
*oh
)
802 struct omap_hwmod_ocp_if
*os
;
808 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
811 os
= oh
->slaves
[oh
->_mpu_port_index
];
813 if (oh
->flags
& HWMOD_NO_IDLEST
)
816 /* XXX check module SIDLEMODE */
818 /* XXX check clock enable states */
820 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
821 ret
= omap2_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
822 oh
->prcm
.omap2
.idlest_reg_id
,
823 oh
->prcm
.omap2
.idlest_idle_bit
);
824 } else if (cpu_is_omap44xx()) {
825 ret
= omap4_cm_wait_module_ready(oh
->prcm
.omap4
.clkctrl_reg
);
834 * _reset - reset an omap_hwmod
835 * @oh: struct omap_hwmod *
837 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
838 * enabled for this to work. Must be called with omap_hwmod_mutex
839 * held. Returns -EINVAL if the hwmod cannot be reset this way or if
840 * the hwmod is in the wrong state, -ETIMEDOUT if the module did not
841 * reset in time, or 0 upon success.
843 static int _reset(struct omap_hwmod
*oh
)
848 if (!oh
->class->sysc
||
849 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
) ||
850 (oh
->class->sysc
->sysc_flags
& SYSS_MISSING
))
853 /* clocks must be on for this operation */
854 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
855 WARN(1, "omap_hwmod: %s: reset can only be entered from "
856 "enabled state\n", oh
->name
);
860 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
863 r
= _set_softreset(oh
, &v
);
866 _write_sysconfig(v
, oh
);
868 omap_test_timeout((omap_hwmod_readl(oh
, oh
->class->sysc
->syss_offs
) &
869 SYSS_RESETDONE_MASK
),
870 MAX_MODULE_RESET_WAIT
, c
);
872 if (c
== MAX_MODULE_RESET_WAIT
)
873 WARN(1, "omap_hwmod: %s: failed to reset in %d usec\n",
874 oh
->name
, MAX_MODULE_RESET_WAIT
);
876 pr_debug("omap_hwmod: %s: reset in %d usec\n", oh
->name
, c
);
879 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
880 * _wait_target_ready() or _reset()
883 return (c
== MAX_MODULE_RESET_WAIT
) ? -ETIMEDOUT
: 0;
887 * _enable - enable an omap_hwmod
888 * @oh: struct omap_hwmod *
890 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
891 * register target. Must be called with omap_hwmod_mutex held.
892 * Returns -EINVAL if the hwmod is in the wrong state or passes along
893 * the return value of _wait_target_ready().
895 static int _enable(struct omap_hwmod
*oh
)
899 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
900 oh
->_state
!= _HWMOD_STATE_IDLE
&&
901 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
902 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
903 "from initialized, idle, or disabled state\n", oh
->name
);
907 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
911 _add_initiator_dep(oh
, mpu_oh
);
914 r
= _wait_target_ready(oh
);
916 oh
->_state
= _HWMOD_STATE_ENABLED
;
918 /* Access the sysconfig only if the target is ready */
919 if (oh
->class->sysc
) {
920 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
921 _update_sysc_cache(oh
);
925 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
933 * _idle - idle an omap_hwmod
934 * @oh: struct omap_hwmod *
936 * Idles an omap_hwmod @oh. This should be called once the hwmod has
937 * no further work. Returns -EINVAL if the hwmod is in the wrong
938 * state or returns 0.
940 static int _idle(struct omap_hwmod
*oh
)
942 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
943 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
944 "enabled state\n", oh
->name
);
948 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
952 _del_initiator_dep(oh
, mpu_oh
);
955 oh
->_state
= _HWMOD_STATE_IDLE
;
961 * _shutdown - shutdown an omap_hwmod
962 * @oh: struct omap_hwmod *
964 * Shut down an omap_hwmod @oh. This should be called when the driver
965 * used for the hwmod is removed or unloaded or if the driver is not
966 * used by the system. Returns -EINVAL if the hwmod is in the wrong
967 * state or returns 0.
969 static int _shutdown(struct omap_hwmod
*oh
)
971 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
972 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
973 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
974 "from idle, or enabled state\n", oh
->name
);
978 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
982 _del_initiator_dep(oh
, mpu_oh
);
983 /* XXX what about the other system initiators here? DMA, tesla, d2d */
985 /* XXX Should this code also force-disable the optional clocks? */
987 /* XXX mux any associated balls to safe mode */
989 oh
->_state
= _HWMOD_STATE_DISABLED
;
995 * _setup - do initial configuration of omap_hwmod
996 * @oh: struct omap_hwmod *
998 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
999 * OCP_SYSCONFIG register. Must be called with omap_hwmod_mutex
1000 * held. Returns -EINVAL if the hwmod is in the wrong state or returns
1003 static int _setup(struct omap_hwmod
*oh
)
1010 /* Set iclk autoidle mode */
1011 if (oh
->slaves_cnt
> 0) {
1012 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1013 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
1014 struct clk
*c
= os
->_clk
;
1019 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
1020 /* XXX omap_iclk_deny_idle(c); */
1022 /* XXX omap_iclk_allow_idle(c); */
1028 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
1032 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1033 oh
->name
, oh
->_state
);
1037 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
)) {
1039 * XXX Do the OCP_SYSCONFIG bits need to be
1040 * reprogrammed after a reset? If not, then this can
1041 * be removed. If they do, then probably the
1042 * _enable() function should be split to avoid the
1043 * rewrite of the OCP_SYSCONFIG register.
1045 if (oh
->class->sysc
) {
1046 _update_sysc_cache(oh
);
1051 if (!(oh
->flags
& HWMOD_INIT_NO_IDLE
))
1059 /* Public functions */
1061 u32
omap_hwmod_readl(struct omap_hwmod
*oh
, u16 reg_offs
)
1063 return __raw_readl(oh
->_rt_va
+ reg_offs
);
1066 void omap_hwmod_writel(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
1068 __raw_writel(v
, oh
->_rt_va
+ reg_offs
);
1071 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
1079 v
= oh
->_sysc_cache
;
1081 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
1083 _write_sysconfig(v
, oh
);
1089 * omap_hwmod_register - register a struct omap_hwmod
1090 * @oh: struct omap_hwmod *
1092 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1093 * already has been registered by the same name; -EINVAL if the
1094 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1095 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1096 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1099 * XXX The data should be copied into bootmem, so the original data
1100 * should be marked __initdata and freed after init. This would allow
1101 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1102 * that the copy process would be relatively complex due to the large number
1105 int omap_hwmod_register(struct omap_hwmod
*oh
)
1109 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
1110 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
1113 mutex_lock(&omap_hwmod_mutex
);
1115 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
1117 if (_lookup(oh
->name
)) {
1122 ms_id
= _find_mpu_port_index(oh
);
1123 if (!IS_ERR_VALUE(ms_id
)) {
1124 oh
->_mpu_port_index
= ms_id
;
1125 oh
->_rt_va
= _find_mpu_rt_base(oh
, oh
->_mpu_port_index
);
1127 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1130 list_add_tail(&oh
->node
, &omap_hwmod_list
);
1132 oh
->_state
= _HWMOD_STATE_REGISTERED
;
1137 mutex_unlock(&omap_hwmod_mutex
);
1142 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1143 * @name: name of the omap_hwmod to look up
1145 * Given a @name of an omap_hwmod, return a pointer to the registered
1146 * struct omap_hwmod *, or NULL upon error.
1148 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
1150 struct omap_hwmod
*oh
;
1155 mutex_lock(&omap_hwmod_mutex
);
1157 mutex_unlock(&omap_hwmod_mutex
);
1163 * omap_hwmod_for_each - call function for each registered omap_hwmod
1164 * @fn: pointer to a callback function
1166 * Call @fn for each registered omap_hwmod, passing @data to each
1167 * function. @fn must return 0 for success or any other value for
1168 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1169 * will stop and the non-zero return value will be passed to the
1170 * caller of omap_hwmod_for_each(). @fn is called with
1171 * omap_hwmod_for_each() held.
1173 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
))
1175 struct omap_hwmod
*temp_oh
;
1181 mutex_lock(&omap_hwmod_mutex
);
1182 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1183 ret
= (*fn
)(temp_oh
);
1187 mutex_unlock(&omap_hwmod_mutex
);
1194 * omap_hwmod_init - init omap_hwmod code and register hwmods
1195 * @ohs: pointer to an array of omap_hwmods to register
1197 * Intended to be called early in boot before the clock framework is
1198 * initialized. If @ohs is not null, will register all omap_hwmods
1199 * listed in @ohs that are valid for this chip. Returns -EINVAL if
1200 * omap_hwmod_init() has already been called or 0 otherwise.
1202 int omap_hwmod_init(struct omap_hwmod
**ohs
)
1204 struct omap_hwmod
*oh
;
1217 if (omap_chip_is(oh
->omap_chip
)) {
1218 r
= omap_hwmod_register(oh
);
1219 WARN(r
, "omap_hwmod: %s: omap_hwmod_register returned "
1220 "%d\n", oh
->name
, r
);
1229 * omap_hwmod_late_init - do some post-clock framework initialization
1231 * Must be called after omap2_clk_init(). Resolves the struct clk names
1232 * to struct clk pointers for each registered omap_hwmod. Also calls
1233 * _setup() on each hwmod. Returns 0.
1235 int omap_hwmod_late_init(void)
1239 /* XXX check return value */
1240 r
= omap_hwmod_for_each(_init_clocks
);
1241 WARN(r
, "omap_hwmod: omap_hwmod_late_init(): _init_clocks failed\n");
1243 mpu_oh
= omap_hwmod_lookup(MPU_INITIATOR_NAME
);
1244 WARN(!mpu_oh
, "omap_hwmod: could not find MPU initiator hwmod %s\n",
1245 MPU_INITIATOR_NAME
);
1247 omap_hwmod_for_each(_setup
);
1253 * omap_hwmod_unregister - unregister an omap_hwmod
1254 * @oh: struct omap_hwmod *
1256 * Unregisters a previously-registered omap_hwmod @oh. There's probably
1257 * no use case for this, so it is likely to be removed in a later version.
1259 * XXX Free all of the bootmem-allocated structures here when that is
1260 * implemented. Make it clear that core code is the only code that is
1261 * expected to unregister modules.
1263 int omap_hwmod_unregister(struct omap_hwmod
*oh
)
1268 pr_debug("omap_hwmod: %s: unregistering\n", oh
->name
);
1270 mutex_lock(&omap_hwmod_mutex
);
1271 iounmap(oh
->_rt_va
);
1272 list_del(&oh
->node
);
1273 mutex_unlock(&omap_hwmod_mutex
);
1279 * omap_hwmod_enable - enable an omap_hwmod
1280 * @oh: struct omap_hwmod *
1282 * Enable an omap_hwomd @oh. Intended to be called by omap_device_enable().
1283 * Returns -EINVAL on error or passes along the return value from _enable().
1285 int omap_hwmod_enable(struct omap_hwmod
*oh
)
1292 mutex_lock(&omap_hwmod_mutex
);
1294 mutex_unlock(&omap_hwmod_mutex
);
1300 * omap_hwmod_idle - idle an omap_hwmod
1301 * @oh: struct omap_hwmod *
1303 * Idle an omap_hwomd @oh. Intended to be called by omap_device_idle().
1304 * Returns -EINVAL on error or passes along the return value from _idle().
1306 int omap_hwmod_idle(struct omap_hwmod
*oh
)
1311 mutex_lock(&omap_hwmod_mutex
);
1313 mutex_unlock(&omap_hwmod_mutex
);
1319 * omap_hwmod_shutdown - shutdown an omap_hwmod
1320 * @oh: struct omap_hwmod *
1322 * Shutdown an omap_hwomd @oh. Intended to be called by
1323 * omap_device_shutdown(). Returns -EINVAL on error or passes along
1324 * the return value from _shutdown().
1326 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
1331 mutex_lock(&omap_hwmod_mutex
);
1333 mutex_unlock(&omap_hwmod_mutex
);
1339 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
1340 * @oh: struct omap_hwmod *oh
1342 * Intended to be called by the omap_device code.
1344 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
1346 mutex_lock(&omap_hwmod_mutex
);
1348 mutex_unlock(&omap_hwmod_mutex
);
1354 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
1355 * @oh: struct omap_hwmod *oh
1357 * Intended to be called by the omap_device code.
1359 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
1361 mutex_lock(&omap_hwmod_mutex
);
1362 _disable_clocks(oh
);
1363 mutex_unlock(&omap_hwmod_mutex
);
1369 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
1370 * @oh: struct omap_hwmod *oh
1372 * Intended to be called by drivers and core code when all posted
1373 * writes to a device must complete before continuing further
1374 * execution (for example, after clearing some device IRQSTATUS
1377 * XXX what about targets with multiple OCP threads?
1379 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
1383 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
1384 WARN(1, "omap_device: %s: OCP barrier impossible due to "
1385 "device configuration\n", oh
->name
);
1390 * Forces posted writes to complete on the OCP thread handling
1393 omap_hwmod_readl(oh
, oh
->class->sysc
->sysc_offs
);
1397 * omap_hwmod_reset - reset the hwmod
1398 * @oh: struct omap_hwmod *
1400 * Under some conditions, a driver may wish to reset the entire device.
1401 * Called from omap_device code. Returns -EINVAL on error or passes along
1402 * the return value from _reset()/_enable().
1404 int omap_hwmod_reset(struct omap_hwmod
*oh
)
1408 if (!oh
|| !(oh
->_state
& _HWMOD_STATE_ENABLED
))
1411 mutex_lock(&omap_hwmod_mutex
);
1415 mutex_unlock(&omap_hwmod_mutex
);
1421 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
1422 * @oh: struct omap_hwmod *
1423 * @res: pointer to the first element of an array of struct resource to fill
1425 * Count the number of struct resource array elements necessary to
1426 * contain omap_hwmod @oh resources. Intended to be called by code
1427 * that registers omap_devices. Intended to be used to determine the
1428 * size of a dynamically-allocated struct resource array, before
1429 * calling omap_hwmod_fill_resources(). Returns the number of struct
1430 * resource array elements needed.
1432 * XXX This code is not optimized. It could attempt to merge adjacent
1436 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
1440 ret
= oh
->mpu_irqs_cnt
+ oh
->sdma_chs_cnt
;
1442 for (i
= 0; i
< oh
->slaves_cnt
; i
++)
1443 ret
+= oh
->slaves
[i
]->addr_cnt
;
1449 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
1450 * @oh: struct omap_hwmod *
1451 * @res: pointer to the first element of an array of struct resource to fill
1453 * Fill the struct resource array @res with resource data from the
1454 * omap_hwmod @oh. Intended to be called by code that registers
1455 * omap_devices. See also omap_hwmod_count_resources(). Returns the
1456 * number of array elements filled.
1458 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
1463 /* For each IRQ, DMA, memory area, fill in array.*/
1465 for (i
= 0; i
< oh
->mpu_irqs_cnt
; i
++) {
1466 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
1467 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
1468 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
1469 (res
+ r
)->flags
= IORESOURCE_IRQ
;
1473 for (i
= 0; i
< oh
->sdma_chs_cnt
; i
++) {
1474 (res
+ r
)->name
= (oh
->sdma_chs
+ i
)->name
;
1475 (res
+ r
)->start
= (oh
->sdma_chs
+ i
)->dma_ch
;
1476 (res
+ r
)->end
= (oh
->sdma_chs
+ i
)->dma_ch
;
1477 (res
+ r
)->flags
= IORESOURCE_DMA
;
1481 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1482 struct omap_hwmod_ocp_if
*os
;
1486 for (j
= 0; j
< os
->addr_cnt
; j
++) {
1487 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
1488 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
1489 (res
+ r
)->flags
= IORESOURCE_MEM
;
1498 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
1499 * @oh: struct omap_hwmod *
1501 * Return the powerdomain pointer associated with the OMAP module
1502 * @oh's main clock. If @oh does not have a main clk, return the
1503 * powerdomain associated with the interface clock associated with the
1504 * module's MPU port. (XXX Perhaps this should use the SDMA port
1505 * instead?) Returns NULL on error, or a struct powerdomain * on
1508 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
1518 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1520 c
= oh
->slaves
[oh
->_mpu_port_index
]->_clk
;
1526 return c
->clkdm
->pwrdm
.ptr
;
1531 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
1532 * @oh: struct omap_hwmod *
1533 * @init_oh: struct omap_hwmod * (initiator)
1535 * Add a sleep dependency between the initiator @init_oh and @oh.
1536 * Intended to be called by DSP/Bridge code via platform_data for the
1537 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
1538 * code needs to add/del initiator dependencies dynamically
1539 * before/after accessing a device. Returns the return value from
1540 * _add_initiator_dep().
1542 * XXX Keep a usecount in the clockdomain code
1544 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
1545 struct omap_hwmod
*init_oh
)
1547 return _add_initiator_dep(oh
, init_oh
);
1551 * XXX what about functions for drivers to save/restore ocp_sysconfig
1552 * for context save/restore operations?
1556 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
1557 * @oh: struct omap_hwmod *
1558 * @init_oh: struct omap_hwmod * (initiator)
1560 * Remove a sleep dependency between the initiator @init_oh and @oh.
1561 * Intended to be called by DSP/Bridge code via platform_data for the
1562 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
1563 * code needs to add/del initiator dependencies dynamically
1564 * before/after accessing a device. Returns the return value from
1565 * _del_initiator_dep().
1567 * XXX Keep a usecount in the clockdomain code
1569 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
1570 struct omap_hwmod
*init_oh
)
1572 return _del_initiator_dep(oh
, init_oh
);
1576 * omap_hwmod_enable_wakeup - allow device to wake up the system
1577 * @oh: struct omap_hwmod *
1579 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
1580 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
1581 * registers to cause the PRCM to receive wakeup events from the
1582 * module. Does not set any wakeup routing registers beyond this
1583 * point - if the module is to wake up any other module or subsystem,
1584 * that must be set separately. Called by omap_device code. Returns
1585 * -EINVAL on error or 0 upon success.
1587 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
1589 if (!oh
->class->sysc
||
1590 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
1593 mutex_lock(&omap_hwmod_mutex
);
1595 mutex_unlock(&omap_hwmod_mutex
);
1601 * omap_hwmod_disable_wakeup - prevent device from waking the system
1602 * @oh: struct omap_hwmod *
1604 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
1605 * from sending wakeups to the PRCM. Eventually this should clear
1606 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
1607 * from the module. Does not set any wakeup routing registers beyond
1608 * this point - if the module is to wake up any other module or
1609 * subsystem, that must be set separately. Called by omap_device
1610 * code. Returns -EINVAL on error or 0 upon success.
1612 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
1614 if (!oh
->class->sysc
||
1615 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
1618 mutex_lock(&omap_hwmod_mutex
);
1619 _disable_wakeup(oh
);
1620 mutex_unlock(&omap_hwmod_mutex
);
1626 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
1627 * @classname: struct omap_hwmod_class name to search for
1628 * @fn: callback function pointer to call for each hwmod in class @classname
1629 * @user: arbitrary context data to pass to the callback function
1631 * For each omap_hwmod of class @classname, call @fn. Takes
1632 * omap_hwmod_mutex to prevent the hwmod list from changing during the
1633 * iteration. If the callback function returns something other than
1634 * zero, the iterator is terminated, and the callback function's return
1635 * value is passed back to the caller. Returns 0 upon success, -EINVAL
1636 * if @classname or @fn are NULL, or passes back the error code from @fn.
1638 int omap_hwmod_for_each_by_class(const char *classname
,
1639 int (*fn
)(struct omap_hwmod
*oh
,
1643 struct omap_hwmod
*temp_oh
;
1646 if (!classname
|| !fn
)
1649 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
1650 __func__
, classname
);
1652 mutex_lock(&omap_hwmod_mutex
);
1654 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1655 if (!strcmp(temp_oh
->class->name
, classname
)) {
1656 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
1657 __func__
, temp_oh
->name
);
1658 ret
= (*fn
)(temp_oh
, user
);
1664 mutex_unlock(&omap_hwmod_mutex
);
1667 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",