2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 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.
18 * One way to view an OMAP SoC is as a collection of largely unrelated
19 * IP blocks connected by interconnects. The IP blocks include
20 * devices such as ARM processors, audio serial interfaces, UARTs,
21 * etc. Some of these devices, like the DSP, are created by TI;
22 * others, like the SGX, largely originate from external vendors. In
23 * TI's documentation, on-chip devices are referred to as "OMAP
24 * modules." Some of these IP blocks are identical across several
25 * OMAP versions. Others are revised frequently.
27 * These OMAP modules are tied together by various interconnects.
28 * Most of the address and data flow between modules is via OCP-based
29 * interconnects such as the L3 and L4 buses; but there are other
30 * interconnects that distribute the hardware clock tree, handle idle
31 * and reset signaling, supply power, and connect the modules to
32 * various pads or balls on the OMAP package.
34 * OMAP hwmod provides a consistent way to describe the on-chip
35 * hardware blocks and their integration into the rest of the chip.
36 * This description can be automatically generated from the TI
37 * hardware database. OMAP hwmod provides a standard, consistent API
38 * to reset, enable, idle, and disable these hardware blocks. And
39 * hwmod provides a way for other core code, such as the Linux device
40 * code or the OMAP power management and address space mapping code,
41 * to query the hardware database.
45 * Drivers won't call hwmod functions directly. That is done by the
46 * omap_device code, and in rare occasions, by custom integration code
47 * in arch/arm/ *omap*. The omap_device code includes functions to
48 * build a struct platform_device using omap_hwmod data, and that is
49 * currently how hwmod data is communicated to drivers and to the
50 * Linux driver model. Most drivers will call omap_hwmod functions only
51 * indirectly, via pm_runtime*() functions.
53 * From a layering perspective, here is where the OMAP hwmod code
54 * fits into the kernel software stack:
56 * +-------------------------------+
57 * | Device driver code |
58 * | (e.g., drivers/) |
59 * +-------------------------------+
60 * | Linux driver model |
61 * | (platform_device / |
62 * | platform_driver data/code) |
63 * +-------------------------------+
64 * | OMAP core-driver integration |
65 * |(arch/arm/mach-omap2/devices.c)|
66 * +-------------------------------+
67 * | omap_device code |
68 * | (../plat-omap/omap_device.c) |
69 * +-------------------------------+
70 * ----> | omap_hwmod code/data | <-----
71 * | (../mach-omap2/omap_hwmod*) |
72 * +-------------------------------+
73 * | OMAP clock/PRCM/register fns |
74 * | (__raw_{read,write}l, clk*) |
75 * +-------------------------------+
77 * Device drivers should not contain any OMAP-specific code or data in
78 * them. They should only contain code to operate the IP block that
79 * the driver is responsible for. This is because these IP blocks can
80 * also appear in other SoCs, either from TI (such as DaVinci) or from
81 * other manufacturers; and drivers should be reusable across other
84 * The OMAP hwmod code also will attempt to reset and idle all on-chip
85 * devices upon boot. The goal here is for the kernel to be
86 * completely self-reliant and independent from bootloaders. This is
87 * to ensure a repeatable configuration, both to ensure consistent
88 * runtime behavior, and to make it easier for others to reproduce
91 * OMAP module activity states
92 * ---------------------------
93 * The hwmod code considers modules to be in one of several activity
94 * states. IP blocks start out in an UNKNOWN state, then once they
95 * are registered via the hwmod code, proceed to the REGISTERED state.
96 * Once their clock names are resolved to clock pointers, the module
97 * enters the CLKS_INITED state; and finally, once the module has been
98 * reset and the integration registers programmed, the INITIALIZED state
99 * is entered. The hwmod code will then place the module into either
100 * the IDLE state to save power, or in the case of a critical system
101 * module, the ENABLED state.
103 * OMAP core integration code can then call omap_hwmod*() functions
104 * directly to move the module between the IDLE, ENABLED, and DISABLED
105 * states, as needed. This is done during both the PM idle loop, and
106 * in the OMAP core integration code's implementation of the PM runtime
111 * This is a partial list.
112 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
113 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
114 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
115 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
116 * - Open Core Protocol Specification 2.2
119 * - handle IO mapping
120 * - bus throughput & module latency measurement code
122 * XXX add tests at the beginning of each function to ensure the hwmod is
123 * in the appropriate state
124 * XXX error return values should be checked to ensure that they are
129 #include <linux/kernel.h>
130 #include <linux/errno.h>
131 #include <linux/io.h>
132 #include <linux/clk.h>
133 #include <linux/delay.h>
134 #include <linux/err.h>
135 #include <linux/list.h>
136 #include <linux/mutex.h>
137 #include <linux/spinlock.h>
139 #include <plat/common.h>
140 #include <plat/cpu.h>
141 #include "clockdomain.h"
142 #include "powerdomain.h"
143 #include <plat/clock.h>
144 #include <plat/omap_hwmod.h>
145 #include <plat/prcm.h>
147 #include "cm2xxx_3xxx.h"
149 #include "prm2xxx_3xxx.h"
153 /* Maximum microseconds to wait for OMAP module to softreset */
154 #define MAX_MODULE_SOFTRESET_WAIT 10000
156 /* Name of the OMAP hwmod for the MPU */
157 #define MPU_INITIATOR_NAME "mpu"
159 /* omap_hwmod_list contains all registered struct omap_hwmods */
160 static LIST_HEAD(omap_hwmod_list
);
162 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
163 static struct omap_hwmod
*mpu_oh
;
166 /* Private functions */
169 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
170 * @oh: struct omap_hwmod *
172 * Load the current value of the hwmod OCP_SYSCONFIG register into the
173 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
174 * OCP_SYSCONFIG register or 0 upon success.
176 static int _update_sysc_cache(struct omap_hwmod
*oh
)
178 if (!oh
->class->sysc
) {
179 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
183 /* XXX ensure module interface clock is up */
185 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
187 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
188 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
194 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
195 * @v: OCP_SYSCONFIG value to write
196 * @oh: struct omap_hwmod *
198 * Write @v into the module class' OCP_SYSCONFIG register, if it has
199 * one. No return value.
201 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
203 if (!oh
->class->sysc
) {
204 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
208 /* XXX ensure module interface clock is up */
210 /* Module might have lost context, always update cache and register */
212 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
216 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
217 * @oh: struct omap_hwmod *
218 * @standbymode: MIDLEMODE field bits
219 * @v: pointer to register contents to modify
221 * Update the master standby mode bits in @v to be @standbymode for
222 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
223 * upon error or 0 upon success.
225 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
231 if (!oh
->class->sysc
||
232 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
235 if (!oh
->class->sysc
->sysc_fields
) {
236 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
240 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
241 mstandby_mask
= (0x3 << mstandby_shift
);
243 *v
&= ~mstandby_mask
;
244 *v
|= __ffs(standbymode
) << mstandby_shift
;
250 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
251 * @oh: struct omap_hwmod *
252 * @idlemode: SIDLEMODE field bits
253 * @v: pointer to register contents to modify
255 * Update the slave idle mode bits in @v to be @idlemode for the @oh
256 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
259 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
264 if (!oh
->class->sysc
||
265 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
268 if (!oh
->class->sysc
->sysc_fields
) {
269 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
273 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
274 sidle_mask
= (0x3 << sidle_shift
);
277 *v
|= __ffs(idlemode
) << sidle_shift
;
283 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
284 * @oh: struct omap_hwmod *
285 * @clockact: CLOCKACTIVITY field bits
286 * @v: pointer to register contents to modify
288 * Update the clockactivity mode bits in @v to be @clockact for the
289 * @oh hwmod. Used for additional powersaving on some modules. Does
290 * not write to the hardware. Returns -EINVAL upon error or 0 upon
293 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
298 if (!oh
->class->sysc
||
299 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
302 if (!oh
->class->sysc
->sysc_fields
) {
303 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
307 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
308 clkact_mask
= (0x3 << clkact_shift
);
311 *v
|= clockact
<< clkact_shift
;
317 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
318 * @oh: struct omap_hwmod *
319 * @v: pointer to register contents to modify
321 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
322 * error or 0 upon success.
324 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
328 if (!oh
->class->sysc
||
329 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
332 if (!oh
->class->sysc
->sysc_fields
) {
333 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
337 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
345 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
346 * @oh: struct omap_hwmod *
347 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
348 * @v: pointer to register contents to modify
350 * Update the module autoidle bit in @v to be @autoidle for the @oh
351 * hwmod. The autoidle bit controls whether the module can gate
352 * internal clocks automatically when it isn't doing anything; the
353 * exact function of this bit varies on a per-module basis. This
354 * function does not write to the hardware. Returns -EINVAL upon
355 * error or 0 upon success.
357 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
363 if (!oh
->class->sysc
||
364 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
367 if (!oh
->class->sysc
->sysc_fields
) {
368 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
372 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
373 autoidle_mask
= (0x1 << autoidle_shift
);
375 *v
&= ~autoidle_mask
;
376 *v
|= autoidle
<< autoidle_shift
;
382 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
383 * @oh: struct omap_hwmod *
385 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
386 * upon error or 0 upon success.
388 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
390 if (!oh
->class->sysc
||
391 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
392 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
393 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
396 if (!oh
->class->sysc
->sysc_fields
) {
397 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
401 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
402 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
404 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
405 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
406 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
407 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
409 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
411 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
417 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
418 * @oh: struct omap_hwmod *
420 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
421 * upon error or 0 upon success.
423 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
425 if (!oh
->class->sysc
||
426 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
427 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
428 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
431 if (!oh
->class->sysc
->sysc_fields
) {
432 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
436 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
437 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
439 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
440 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
441 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
442 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
444 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
446 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
452 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
453 * @oh: struct omap_hwmod *
455 * Prevent the hardware module @oh from entering idle while the
456 * hardare module initiator @init_oh is active. Useful when a module
457 * will be accessed by a particular initiator (e.g., if a module will
458 * be accessed by the IVA, there should be a sleepdep between the IVA
459 * initiator and the module). Only applies to modules in smart-idle
460 * mode. If the clockdomain is marked as not needing autodeps, return
461 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
462 * passes along clkdm_add_sleepdep() value upon success.
464 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
469 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
472 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
476 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
477 * @oh: struct omap_hwmod *
479 * Allow the hardware module @oh to enter idle while the hardare
480 * module initiator @init_oh is active. Useful when a module will not
481 * be accessed by a particular initiator (e.g., if a module will not
482 * be accessed by the IVA, there should be no sleepdep between the IVA
483 * initiator and the module). Only applies to modules in smart-idle
484 * mode. If the clockdomain is marked as not needing autodeps, return
485 * 0 without doing anything. Returns -EINVAL upon error or passes
486 * along clkdm_del_sleepdep() value upon success.
488 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
493 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
496 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
500 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
501 * @oh: struct omap_hwmod *
503 * Called from _init_clocks(). Populates the @oh _clk (main
504 * functional clock pointer) if a main_clk is present. Returns 0 on
505 * success or -EINVAL on error.
507 static int _init_main_clk(struct omap_hwmod
*oh
)
514 oh
->_clk
= omap_clk_get_by_name(oh
->main_clk
);
516 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
517 oh
->name
, oh
->main_clk
);
521 if (!oh
->_clk
->clkdm
)
522 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
523 oh
->main_clk
, oh
->_clk
->name
);
529 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
530 * @oh: struct omap_hwmod *
532 * Called from _init_clocks(). Populates the @oh OCP slave interface
533 * clock pointers. Returns 0 on success or -EINVAL on error.
535 static int _init_interface_clks(struct omap_hwmod
*oh
)
541 if (oh
->slaves_cnt
== 0)
544 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
545 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
550 c
= omap_clk_get_by_name(os
->clk
);
552 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
563 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
564 * @oh: struct omap_hwmod *
566 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
567 * clock pointers. Returns 0 on success or -EINVAL on error.
569 static int _init_opt_clks(struct omap_hwmod
*oh
)
571 struct omap_hwmod_opt_clk
*oc
;
576 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
577 c
= omap_clk_get_by_name(oc
->clk
);
579 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
590 * _enable_clocks - enable hwmod main clock and interface clocks
591 * @oh: struct omap_hwmod *
593 * Enables all clocks necessary for register reads and writes to succeed
594 * on the hwmod @oh. Returns 0.
596 static int _enable_clocks(struct omap_hwmod
*oh
)
600 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
603 clk_enable(oh
->_clk
);
605 if (oh
->slaves_cnt
> 0) {
606 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
607 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
608 struct clk
*c
= os
->_clk
;
610 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
615 /* The opt clocks are controlled by the device driver. */
621 * _disable_clocks - disable hwmod main clock and interface clocks
622 * @oh: struct omap_hwmod *
624 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
626 static int _disable_clocks(struct omap_hwmod
*oh
)
630 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
633 clk_disable(oh
->_clk
);
635 if (oh
->slaves_cnt
> 0) {
636 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
637 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
638 struct clk
*c
= os
->_clk
;
640 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
645 /* The opt clocks are controlled by the device driver. */
650 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
652 struct omap_hwmod_opt_clk
*oc
;
655 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
657 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
659 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
661 clk_enable(oc
->_clk
);
665 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
667 struct omap_hwmod_opt_clk
*oc
;
670 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
672 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
674 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
676 clk_disable(oc
->_clk
);
681 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
682 * @oh: struct omap_hwmod *
684 * Returns the array index of the OCP slave port that the MPU
685 * addresses the device on, or -EINVAL upon error or not found.
687 static int __init
_find_mpu_port_index(struct omap_hwmod
*oh
)
692 if (!oh
|| oh
->slaves_cnt
== 0)
695 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
696 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
698 if (os
->user
& OCP_USER_MPU
) {
705 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
708 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
711 return (found
) ? i
: -EINVAL
;
715 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
716 * @oh: struct omap_hwmod *
718 * Return the virtual address of the base of the register target of
719 * device @oh, or NULL on error.
721 static void __iomem
* __init
_find_mpu_rt_base(struct omap_hwmod
*oh
, u8 index
)
723 struct omap_hwmod_ocp_if
*os
;
724 struct omap_hwmod_addr_space
*mem
;
727 void __iomem
*va_start
;
729 if (!oh
|| oh
->slaves_cnt
== 0)
732 os
= oh
->slaves
[index
];
734 for (i
= 0, mem
= os
->addr
; i
< os
->addr_cnt
; i
++, mem
++) {
735 if (mem
->flags
& ADDR_TYPE_RT
) {
742 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
744 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
747 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
750 pr_debug("omap_hwmod: %s: no MPU register target found\n",
754 return (found
) ? va_start
: NULL
;
758 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
759 * @oh: struct omap_hwmod *
761 * If module is marked as SWSUP_SIDLE, force the module out of slave
762 * idle; otherwise, configure it for smart-idle. If module is marked
763 * as SWSUP_MSUSPEND, force the module out of master standby;
764 * otherwise, configure it for smart-standby. No return value.
766 static void _enable_sysc(struct omap_hwmod
*oh
)
771 if (!oh
->class->sysc
)
775 sf
= oh
->class->sysc
->sysc_flags
;
777 if (sf
& SYSC_HAS_SIDLEMODE
) {
778 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
779 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
780 _set_slave_idlemode(oh
, idlemode
, &v
);
783 if (sf
& SYSC_HAS_MIDLEMODE
) {
784 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
785 idlemode
= HWMOD_IDLEMODE_NO
;
787 if (sf
& SYSC_HAS_ENAWAKEUP
)
788 _enable_wakeup(oh
, &v
);
789 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
790 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
792 idlemode
= HWMOD_IDLEMODE_SMART
;
794 _set_master_standbymode(oh
, idlemode
, &v
);
798 * XXX The clock framework should handle this, by
799 * calling into this code. But this must wait until the
800 * clock structures are tagged with omap_hwmod entries
802 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
803 (sf
& SYSC_HAS_CLOCKACTIVITY
))
804 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
806 /* If slave is in SMARTIDLE, also enable wakeup */
807 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
808 _enable_wakeup(oh
, &v
);
810 _write_sysconfig(v
, oh
);
813 * Set the autoidle bit only after setting the smartidle bit
814 * Setting this will not have any impact on the other modules.
816 if (sf
& SYSC_HAS_AUTOIDLE
) {
817 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
819 _set_module_autoidle(oh
, idlemode
, &v
);
820 _write_sysconfig(v
, oh
);
825 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
826 * @oh: struct omap_hwmod *
828 * If module is marked as SWSUP_SIDLE, force the module into slave
829 * idle; otherwise, configure it for smart-idle. If module is marked
830 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
831 * configure it for smart-standby. No return value.
833 static void _idle_sysc(struct omap_hwmod
*oh
)
838 if (!oh
->class->sysc
)
842 sf
= oh
->class->sysc
->sysc_flags
;
844 if (sf
& SYSC_HAS_SIDLEMODE
) {
845 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
846 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
847 _set_slave_idlemode(oh
, idlemode
, &v
);
850 if (sf
& SYSC_HAS_MIDLEMODE
) {
851 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
852 idlemode
= HWMOD_IDLEMODE_FORCE
;
854 if (sf
& SYSC_HAS_ENAWAKEUP
)
855 _enable_wakeup(oh
, &v
);
856 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
857 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
859 idlemode
= HWMOD_IDLEMODE_SMART
;
861 _set_master_standbymode(oh
, idlemode
, &v
);
864 /* If slave is in SMARTIDLE, also enable wakeup */
865 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
866 _enable_wakeup(oh
, &v
);
868 _write_sysconfig(v
, oh
);
872 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
873 * @oh: struct omap_hwmod *
875 * Force the module into slave idle and master suspend. No return
878 static void _shutdown_sysc(struct omap_hwmod
*oh
)
883 if (!oh
->class->sysc
)
887 sf
= oh
->class->sysc
->sysc_flags
;
889 if (sf
& SYSC_HAS_SIDLEMODE
)
890 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
892 if (sf
& SYSC_HAS_MIDLEMODE
)
893 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
895 if (sf
& SYSC_HAS_AUTOIDLE
)
896 _set_module_autoidle(oh
, 1, &v
);
898 _write_sysconfig(v
, oh
);
902 * _lookup - find an omap_hwmod by name
903 * @name: find an omap_hwmod by name
905 * Return a pointer to an omap_hwmod by name, or NULL if not found.
907 static struct omap_hwmod
*_lookup(const char *name
)
909 struct omap_hwmod
*oh
, *temp_oh
;
913 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
914 if (!strcmp(name
, temp_oh
->name
)) {
924 * _init_clocks - clk_get() all clocks associated with this hwmod
925 * @oh: struct omap_hwmod *
926 * @data: not used; pass NULL
928 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
929 * Resolves all clock names embedded in the hwmod. Returns 0 on
930 * success, or a negative error code on failure.
932 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
936 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
939 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
941 ret
|= _init_main_clk(oh
);
942 ret
|= _init_interface_clks(oh
);
943 ret
|= _init_opt_clks(oh
);
946 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
948 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
954 * _wait_target_ready - wait for a module to leave slave idle
955 * @oh: struct omap_hwmod *
957 * Wait for a module @oh to leave slave idle. Returns 0 if the module
958 * does not have an IDLEST bit or if the module successfully leaves
959 * slave idle; otherwise, pass along the return value of the
960 * appropriate *_cm_wait_module_ready() function.
962 static int _wait_target_ready(struct omap_hwmod
*oh
)
964 struct omap_hwmod_ocp_if
*os
;
970 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
973 os
= oh
->slaves
[oh
->_mpu_port_index
];
975 if (oh
->flags
& HWMOD_NO_IDLEST
)
978 /* XXX check module SIDLEMODE */
980 /* XXX check clock enable states */
982 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
983 ret
= omap2_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
984 oh
->prcm
.omap2
.idlest_reg_id
,
985 oh
->prcm
.omap2
.idlest_idle_bit
);
986 } else if (cpu_is_omap44xx()) {
987 ret
= omap4_cm_wait_module_ready(oh
->prcm
.omap4
.clkctrl_reg
);
996 * _lookup_hardreset - fill register bit info for this hwmod/reset line
997 * @oh: struct omap_hwmod *
998 * @name: name of the reset line in the context of this hwmod
999 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1001 * Return the bit position of the reset line that match the
1002 * input name. Return -ENOENT if not found.
1004 static u8
_lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1005 struct omap_hwmod_rst_info
*ohri
)
1009 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1010 const char *rst_line
= oh
->rst_lines
[i
].name
;
1011 if (!strcmp(rst_line
, name
)) {
1012 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1013 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1014 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1015 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1026 * _assert_hardreset - assert the HW reset line of submodules
1027 * contained in the hwmod module.
1028 * @oh: struct omap_hwmod *
1029 * @name: name of the reset line to lookup and assert
1031 * Some IP like dsp, ipu or iva contain processor that require
1032 * an HW reset line to be assert / deassert in order to enable fully
1035 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1037 struct omap_hwmod_rst_info ohri
;
1043 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1044 if (IS_ERR_VALUE(ret
))
1047 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1048 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
1050 else if (cpu_is_omap44xx())
1051 return omap4_prm_assert_hardreset(oh
->prcm
.omap4
.rstctrl_reg
,
1058 * _deassert_hardreset - deassert the HW reset line of submodules contained
1059 * in the hwmod module.
1060 * @oh: struct omap_hwmod *
1061 * @name: name of the reset line to look up and deassert
1063 * Some IP like dsp, ipu or iva contain processor that require
1064 * an HW reset line to be assert / deassert in order to enable fully
1067 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1069 struct omap_hwmod_rst_info ohri
;
1075 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1076 if (IS_ERR_VALUE(ret
))
1079 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1080 ret
= omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
1083 } else if (cpu_is_omap44xx()) {
1085 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1087 ret
= omap4_prm_deassert_hardreset(oh
->prcm
.omap4
.rstctrl_reg
,
1094 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1100 * _read_hardreset - read the HW reset line state of submodules
1101 * contained in the hwmod module
1102 * @oh: struct omap_hwmod *
1103 * @name: name of the reset line to look up and read
1105 * Return the state of the reset line.
1107 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1109 struct omap_hwmod_rst_info ohri
;
1115 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1116 if (IS_ERR_VALUE(ret
))
1119 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1120 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
1122 } else if (cpu_is_omap44xx()) {
1123 return omap4_prm_is_hardreset_asserted(oh
->prcm
.omap4
.rstctrl_reg
,
1131 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1132 * @oh: struct omap_hwmod *
1134 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1135 * enabled for this to work. Returns -EINVAL if the hwmod cannot be
1136 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1137 * the module did not reset in time, or 0 upon success.
1139 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1140 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1141 * use the SYSCONFIG softreset bit to provide the status.
1143 * Note that some IP like McBSP do have reset control but don't have
1146 static int _ocp_softreset(struct omap_hwmod
*oh
)
1152 if (!oh
->class->sysc
||
1153 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1156 /* clocks must be on for this operation */
1157 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1158 pr_warning("omap_hwmod: %s: reset can only be entered from "
1159 "enabled state\n", oh
->name
);
1163 /* For some modules, all optionnal clocks need to be enabled as well */
1164 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1165 _enable_optional_clocks(oh
);
1167 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1169 v
= oh
->_sysc_cache
;
1170 ret
= _set_softreset(oh
, &v
);
1173 _write_sysconfig(v
, oh
);
1175 if (oh
->class->sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
1176 omap_test_timeout((omap_hwmod_read(oh
,
1177 oh
->class->sysc
->syss_offs
)
1178 & SYSS_RESETDONE_MASK
),
1179 MAX_MODULE_SOFTRESET_WAIT
, c
);
1180 else if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
)
1181 omap_test_timeout(!(omap_hwmod_read(oh
,
1182 oh
->class->sysc
->sysc_offs
)
1183 & SYSC_TYPE2_SOFTRESET_MASK
),
1184 MAX_MODULE_SOFTRESET_WAIT
, c
);
1186 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1187 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1188 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1190 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1193 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1194 * _wait_target_ready() or _reset()
1197 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1200 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1201 _disable_optional_clocks(oh
);
1207 * _reset - reset an omap_hwmod
1208 * @oh: struct omap_hwmod *
1210 * Resets an omap_hwmod @oh. The default software reset mechanism for
1211 * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
1212 * bit. However, some hwmods cannot be reset via this method: some
1213 * are not targets and therefore have no OCP header registers to
1214 * access; others (like the IVA) have idiosyncratic reset sequences.
1215 * So for these relatively rare cases, custom reset code can be
1216 * supplied in the struct omap_hwmod_class .reset function pointer.
1217 * Passes along the return value from either _reset() or the custom
1218 * reset function - these must return -EINVAL if the hwmod cannot be
1219 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1220 * the module did not reset in time, or 0 upon success.
1222 static int _reset(struct omap_hwmod
*oh
)
1226 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1228 ret
= (oh
->class->reset
) ? oh
->class->reset(oh
) : _ocp_softreset(oh
);
1234 * _enable - enable an omap_hwmod
1235 * @oh: struct omap_hwmod *
1237 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1238 * register target. Returns -EINVAL if the hwmod is in the wrong
1239 * state or passes along the return value of _wait_target_ready().
1241 static int _enable(struct omap_hwmod
*oh
)
1245 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
1246 oh
->_state
!= _HWMOD_STATE_IDLE
&&
1247 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
1248 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
1249 "from initialized, idle, or disabled state\n", oh
->name
);
1253 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
1255 /* Mux pins for device runtime if populated */
1256 if (oh
->mux
&& (!oh
->mux
->enabled
||
1257 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
1258 oh
->mux
->pads_dynamic
)))
1259 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
1261 _add_initiator_dep(oh
, mpu_oh
);
1265 * If an IP contains only one HW reset line, then de-assert it in order
1266 * to allow the module state transition. Otherwise the PRCM will return
1267 * Intransition status, and the init will failed.
1269 if ((oh
->_state
== _HWMOD_STATE_INITIALIZED
||
1270 oh
->_state
== _HWMOD_STATE_DISABLED
) && oh
->rst_lines_cnt
== 1)
1271 _deassert_hardreset(oh
, oh
->rst_lines
[0].name
);
1273 r
= _wait_target_ready(oh
);
1275 oh
->_state
= _HWMOD_STATE_ENABLED
;
1277 /* Access the sysconfig only if the target is ready */
1278 if (oh
->class->sysc
) {
1279 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
1280 _update_sysc_cache(oh
);
1284 _disable_clocks(oh
);
1285 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1293 * _idle - idle an omap_hwmod
1294 * @oh: struct omap_hwmod *
1296 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1297 * no further work. Returns -EINVAL if the hwmod is in the wrong
1298 * state or returns 0.
1300 static int _idle(struct omap_hwmod
*oh
)
1302 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1303 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
1304 "enabled state\n", oh
->name
);
1308 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
1310 if (oh
->class->sysc
)
1312 _del_initiator_dep(oh
, mpu_oh
);
1313 _disable_clocks(oh
);
1315 /* Mux pins for device idle if populated */
1316 if (oh
->mux
&& oh
->mux
->pads_dynamic
)
1317 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
1319 oh
->_state
= _HWMOD_STATE_IDLE
;
1325 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1326 * @oh: struct omap_hwmod *
1327 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1329 * Sets the IP block's OCP autoidle bit in hardware, and updates our
1330 * local copy. Intended to be used by drivers that require
1331 * direct manipulation of the AUTOIDLE bits.
1332 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1333 * along the return value from _set_module_autoidle().
1335 * Any users of this function should be scrutinized carefully.
1337 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod
*oh
, u8 autoidle
)
1341 unsigned long flags
;
1343 if (!oh
|| oh
->_state
!= _HWMOD_STATE_ENABLED
)
1346 spin_lock_irqsave(&oh
->_lock
, flags
);
1348 v
= oh
->_sysc_cache
;
1350 retval
= _set_module_autoidle(oh
, autoidle
, &v
);
1353 _write_sysconfig(v
, oh
);
1355 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1361 * _shutdown - shutdown an omap_hwmod
1362 * @oh: struct omap_hwmod *
1364 * Shut down an omap_hwmod @oh. This should be called when the driver
1365 * used for the hwmod is removed or unloaded or if the driver is not
1366 * used by the system. Returns -EINVAL if the hwmod is in the wrong
1367 * state or returns 0.
1369 static int _shutdown(struct omap_hwmod
*oh
)
1374 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
1375 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1376 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
1377 "from idle, or enabled state\n", oh
->name
);
1381 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
1383 if (oh
->class->pre_shutdown
) {
1384 prev_state
= oh
->_state
;
1385 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1387 ret
= oh
->class->pre_shutdown(oh
);
1389 if (prev_state
== _HWMOD_STATE_IDLE
)
1395 if (oh
->class->sysc
) {
1396 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1401 /* clocks and deps are already disabled in idle */
1402 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
1403 _del_initiator_dep(oh
, mpu_oh
);
1404 /* XXX what about the other system initiators here? dma, dsp */
1405 _disable_clocks(oh
);
1407 /* XXX Should this code also force-disable the optional clocks? */
1410 * If an IP contains only one HW reset line, then assert it
1411 * after disabling the clocks and before shutting down the IP.
1413 if (oh
->rst_lines_cnt
== 1)
1414 _assert_hardreset(oh
, oh
->rst_lines
[0].name
);
1416 /* Mux pins to safe mode or use populated off mode values */
1418 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
1420 oh
->_state
= _HWMOD_STATE_DISABLED
;
1426 * _setup - do initial configuration of omap_hwmod
1427 * @oh: struct omap_hwmod *
1429 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
1430 * OCP_SYSCONFIG register. Returns 0.
1432 static int _setup(struct omap_hwmod
*oh
, void *data
)
1437 if (oh
->_state
!= _HWMOD_STATE_CLKS_INITED
)
1440 /* Set iclk autoidle mode */
1441 if (oh
->slaves_cnt
> 0) {
1442 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1443 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
1444 struct clk
*c
= os
->_clk
;
1449 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
1450 /* XXX omap_iclk_deny_idle(c); */
1452 /* XXX omap_iclk_allow_idle(c); */
1458 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
1461 * In the case of hwmod with hardreset that should not be
1462 * de-assert at boot time, we have to keep the module
1463 * initialized, because we cannot enable it properly with the
1464 * reset asserted. Exit without warning because that behavior is
1467 if ((oh
->flags
& HWMOD_INIT_NO_RESET
) && oh
->rst_lines_cnt
== 1)
1472 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1473 oh
->name
, oh
->_state
);
1477 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
)) {
1481 * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
1482 * The _enable() function should be split to
1483 * avoid the rewrite of the OCP_SYSCONFIG register.
1485 if (oh
->class->sysc
) {
1486 _update_sysc_cache(oh
);
1491 postsetup_state
= oh
->_postsetup_state
;
1492 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
1493 postsetup_state
= _HWMOD_STATE_ENABLED
;
1496 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
1497 * it should be set by the core code as a runtime flag during startup
1499 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
1500 (postsetup_state
== _HWMOD_STATE_IDLE
))
1501 postsetup_state
= _HWMOD_STATE_ENABLED
;
1503 if (postsetup_state
== _HWMOD_STATE_IDLE
)
1505 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
1507 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
1508 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
1509 oh
->name
, postsetup_state
);
1515 * _register - register a struct omap_hwmod
1516 * @oh: struct omap_hwmod *
1518 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1519 * already has been registered by the same name; -EINVAL if the
1520 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1521 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1522 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1525 * XXX The data should be copied into bootmem, so the original data
1526 * should be marked __initdata and freed after init. This would allow
1527 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1528 * that the copy process would be relatively complex due to the large number
1531 static int __init
_register(struct omap_hwmod
*oh
)
1535 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
1536 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
1539 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
1541 if (_lookup(oh
->name
))
1544 ms_id
= _find_mpu_port_index(oh
);
1545 if (!IS_ERR_VALUE(ms_id
))
1546 oh
->_mpu_port_index
= ms_id
;
1548 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1550 list_add_tail(&oh
->node
, &omap_hwmod_list
);
1552 spin_lock_init(&oh
->_lock
);
1554 oh
->_state
= _HWMOD_STATE_REGISTERED
;
1557 * XXX Rather than doing a strcmp(), this should test a flag
1558 * set in the hwmod data, inserted by the autogenerator code.
1560 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
1567 /* Public functions */
1569 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
1571 if (oh
->flags
& HWMOD_16BIT_REG
)
1572 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
1574 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
1577 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
1579 if (oh
->flags
& HWMOD_16BIT_REG
)
1580 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
1582 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
1586 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
1587 * @oh: struct omap_hwmod *
1588 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
1590 * Sets the IP block's OCP slave idlemode in hardware, and updates our
1591 * local copy. Intended to be used by drivers that have some erratum
1592 * that requires direct manipulation of the SIDLEMODE bits. Returns
1593 * -EINVAL if @oh is null, or passes along the return value from
1594 * _set_slave_idlemode().
1596 * XXX Does this function have any current users? If not, we should
1597 * remove it; it is better to let the rest of the hwmod code handle this.
1598 * Any users of this function should be scrutinized carefully.
1600 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
1608 v
= oh
->_sysc_cache
;
1610 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
1612 _write_sysconfig(v
, oh
);
1618 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1619 * @name: name of the omap_hwmod to look up
1621 * Given a @name of an omap_hwmod, return a pointer to the registered
1622 * struct omap_hwmod *, or NULL upon error.
1624 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
1626 struct omap_hwmod
*oh
;
1637 * omap_hwmod_for_each - call function for each registered omap_hwmod
1638 * @fn: pointer to a callback function
1639 * @data: void * data to pass to callback function
1641 * Call @fn for each registered omap_hwmod, passing @data to each
1642 * function. @fn must return 0 for success or any other value for
1643 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1644 * will stop and the non-zero return value will be passed to the
1645 * caller of omap_hwmod_for_each(). @fn is called with
1646 * omap_hwmod_for_each() held.
1648 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
1651 struct omap_hwmod
*temp_oh
;
1657 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1658 ret
= (*fn
)(temp_oh
, data
);
1667 * omap_hwmod_register - register an array of hwmods
1668 * @ohs: pointer to an array of omap_hwmods to register
1670 * Intended to be called early in boot before the clock framework is
1671 * initialized. If @ohs is not null, will register all omap_hwmods
1672 * listed in @ohs that are valid for this chip. Returns 0.
1674 int __init
omap_hwmod_register(struct omap_hwmod
**ohs
)
1683 if (!omap_chip_is(ohs
[i
]->omap_chip
))
1686 r
= _register(ohs
[i
]);
1687 WARN(r
, "omap_hwmod: %s: _register returned %d\n", ohs
[i
]->name
,
1695 * _populate_mpu_rt_base - populate the virtual address for a hwmod
1697 * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
1698 * Assumes the caller takes care of locking if needed.
1700 static int __init
_populate_mpu_rt_base(struct omap_hwmod
*oh
, void *data
)
1702 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1705 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1708 oh
->_mpu_rt_va
= _find_mpu_rt_base(oh
, oh
->_mpu_port_index
);
1714 * omap_hwmod_setup_one - set up a single hwmod
1715 * @oh_name: const char * name of the already-registered hwmod to set up
1717 * Must be called after omap2_clk_init(). Resolves the struct clk
1718 * names to struct clk pointers for each registered omap_hwmod. Also
1719 * calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
1722 int __init
omap_hwmod_setup_one(const char *oh_name
)
1724 struct omap_hwmod
*oh
;
1727 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
1730 pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
1731 oh_name
, MPU_INITIATOR_NAME
);
1735 oh
= _lookup(oh_name
);
1737 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
1741 if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
1742 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
1744 r
= _populate_mpu_rt_base(oh
, NULL
);
1745 if (IS_ERR_VALUE(r
)) {
1746 WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name
);
1750 r
= _init_clocks(oh
, NULL
);
1751 if (IS_ERR_VALUE(r
)) {
1752 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name
);
1762 * omap_hwmod_setup - do some post-clock framework initialization
1764 * Must be called after omap2_clk_init(). Resolves the struct clk names
1765 * to struct clk pointers for each registered omap_hwmod. Also calls
1766 * _setup() on each hwmod. Returns 0 upon success.
1768 static int __init
omap_hwmod_setup_all(void)
1773 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
1774 __func__
, MPU_INITIATOR_NAME
);
1778 r
= omap_hwmod_for_each(_populate_mpu_rt_base
, NULL
);
1780 r
= omap_hwmod_for_each(_init_clocks
, NULL
);
1781 WARN(IS_ERR_VALUE(r
),
1782 "omap_hwmod: %s: _init_clocks failed\n", __func__
);
1784 omap_hwmod_for_each(_setup
, NULL
);
1788 core_initcall(omap_hwmod_setup_all
);
1791 * omap_hwmod_enable - enable an omap_hwmod
1792 * @oh: struct omap_hwmod *
1794 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
1795 * Returns -EINVAL on error or passes along the return value from _enable().
1797 int omap_hwmod_enable(struct omap_hwmod
*oh
)
1800 unsigned long flags
;
1805 spin_lock_irqsave(&oh
->_lock
, flags
);
1807 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1813 * omap_hwmod_idle - idle an omap_hwmod
1814 * @oh: struct omap_hwmod *
1816 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
1817 * Returns -EINVAL on error or passes along the return value from _idle().
1819 int omap_hwmod_idle(struct omap_hwmod
*oh
)
1821 unsigned long flags
;
1826 spin_lock_irqsave(&oh
->_lock
, flags
);
1828 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1834 * omap_hwmod_shutdown - shutdown an omap_hwmod
1835 * @oh: struct omap_hwmod *
1837 * Shutdown an omap_hwmod @oh. Intended to be called by
1838 * omap_device_shutdown(). Returns -EINVAL on error or passes along
1839 * the return value from _shutdown().
1841 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
1843 unsigned long flags
;
1848 spin_lock_irqsave(&oh
->_lock
, flags
);
1850 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1856 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
1857 * @oh: struct omap_hwmod *oh
1859 * Intended to be called by the omap_device code.
1861 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
1863 unsigned long flags
;
1865 spin_lock_irqsave(&oh
->_lock
, flags
);
1867 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1873 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
1874 * @oh: struct omap_hwmod *oh
1876 * Intended to be called by the omap_device code.
1878 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
1880 unsigned long flags
;
1882 spin_lock_irqsave(&oh
->_lock
, flags
);
1883 _disable_clocks(oh
);
1884 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1890 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
1891 * @oh: struct omap_hwmod *oh
1893 * Intended to be called by drivers and core code when all posted
1894 * writes to a device must complete before continuing further
1895 * execution (for example, after clearing some device IRQSTATUS
1898 * XXX what about targets with multiple OCP threads?
1900 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
1904 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
1905 WARN(1, "omap_device: %s: OCP barrier impossible due to "
1906 "device configuration\n", oh
->name
);
1911 * Forces posted writes to complete on the OCP thread handling
1914 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
1918 * omap_hwmod_reset - reset the hwmod
1919 * @oh: struct omap_hwmod *
1921 * Under some conditions, a driver may wish to reset the entire device.
1922 * Called from omap_device code. Returns -EINVAL on error or passes along
1923 * the return value from _reset().
1925 int omap_hwmod_reset(struct omap_hwmod
*oh
)
1928 unsigned long flags
;
1933 spin_lock_irqsave(&oh
->_lock
, flags
);
1935 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1941 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
1942 * @oh: struct omap_hwmod *
1943 * @res: pointer to the first element of an array of struct resource to fill
1945 * Count the number of struct resource array elements necessary to
1946 * contain omap_hwmod @oh resources. Intended to be called by code
1947 * that registers omap_devices. Intended to be used to determine the
1948 * size of a dynamically-allocated struct resource array, before
1949 * calling omap_hwmod_fill_resources(). Returns the number of struct
1950 * resource array elements needed.
1952 * XXX This code is not optimized. It could attempt to merge adjacent
1956 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
1960 ret
= oh
->mpu_irqs_cnt
+ oh
->sdma_reqs_cnt
;
1962 for (i
= 0; i
< oh
->slaves_cnt
; i
++)
1963 ret
+= oh
->slaves
[i
]->addr_cnt
;
1969 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
1970 * @oh: struct omap_hwmod *
1971 * @res: pointer to the first element of an array of struct resource to fill
1973 * Fill the struct resource array @res with resource data from the
1974 * omap_hwmod @oh. Intended to be called by code that registers
1975 * omap_devices. See also omap_hwmod_count_resources(). Returns the
1976 * number of array elements filled.
1978 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
1983 /* For each IRQ, DMA, memory area, fill in array.*/
1985 for (i
= 0; i
< oh
->mpu_irqs_cnt
; i
++) {
1986 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
1987 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
1988 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
1989 (res
+ r
)->flags
= IORESOURCE_IRQ
;
1993 for (i
= 0; i
< oh
->sdma_reqs_cnt
; i
++) {
1994 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
1995 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
1996 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
1997 (res
+ r
)->flags
= IORESOURCE_DMA
;
2001 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
2002 struct omap_hwmod_ocp_if
*os
;
2006 for (j
= 0; j
< os
->addr_cnt
; j
++) {
2007 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
2008 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
2009 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
2010 (res
+ r
)->flags
= IORESOURCE_MEM
;
2019 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2020 * @oh: struct omap_hwmod *
2022 * Return the powerdomain pointer associated with the OMAP module
2023 * @oh's main clock. If @oh does not have a main clk, return the
2024 * powerdomain associated with the interface clock associated with the
2025 * module's MPU port. (XXX Perhaps this should use the SDMA port
2026 * instead?) Returns NULL on error, or a struct powerdomain * on
2029 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
2039 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2041 c
= oh
->slaves
[oh
->_mpu_port_index
]->_clk
;
2047 return c
->clkdm
->pwrdm
.ptr
;
2052 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
2053 * @oh: struct omap_hwmod *
2055 * Returns the virtual address corresponding to the beginning of the
2056 * module's register target, in the address range that is intended to
2057 * be used by the MPU. Returns the virtual address upon success or NULL
2060 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
2065 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2068 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
2071 return oh
->_mpu_rt_va
;
2075 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
2076 * @oh: struct omap_hwmod *
2077 * @init_oh: struct omap_hwmod * (initiator)
2079 * Add a sleep dependency between the initiator @init_oh and @oh.
2080 * Intended to be called by DSP/Bridge code via platform_data for the
2081 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2082 * code needs to add/del initiator dependencies dynamically
2083 * before/after accessing a device. Returns the return value from
2084 * _add_initiator_dep().
2086 * XXX Keep a usecount in the clockdomain code
2088 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
2089 struct omap_hwmod
*init_oh
)
2091 return _add_initiator_dep(oh
, init_oh
);
2095 * XXX what about functions for drivers to save/restore ocp_sysconfig
2096 * for context save/restore operations?
2100 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
2101 * @oh: struct omap_hwmod *
2102 * @init_oh: struct omap_hwmod * (initiator)
2104 * Remove a sleep dependency between the initiator @init_oh and @oh.
2105 * Intended to be called by DSP/Bridge code via platform_data for the
2106 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2107 * code needs to add/del initiator dependencies dynamically
2108 * before/after accessing a device. Returns the return value from
2109 * _del_initiator_dep().
2111 * XXX Keep a usecount in the clockdomain code
2113 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
2114 struct omap_hwmod
*init_oh
)
2116 return _del_initiator_dep(oh
, init_oh
);
2120 * omap_hwmod_enable_wakeup - allow device to wake up the system
2121 * @oh: struct omap_hwmod *
2123 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
2124 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
2125 * registers to cause the PRCM to receive wakeup events from the
2126 * module. Does not set any wakeup routing registers beyond this
2127 * point - if the module is to wake up any other module or subsystem,
2128 * that must be set separately. Called by omap_device code. Returns
2129 * -EINVAL on error or 0 upon success.
2131 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
2133 unsigned long flags
;
2136 if (!oh
->class->sysc
||
2137 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
2140 spin_lock_irqsave(&oh
->_lock
, flags
);
2141 v
= oh
->_sysc_cache
;
2142 _enable_wakeup(oh
, &v
);
2143 _write_sysconfig(v
, oh
);
2144 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2150 * omap_hwmod_disable_wakeup - prevent device from waking the system
2151 * @oh: struct omap_hwmod *
2153 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
2154 * from sending wakeups to the PRCM. Eventually this should clear
2155 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
2156 * from the module. Does not set any wakeup routing registers beyond
2157 * this point - if the module is to wake up any other module or
2158 * subsystem, that must be set separately. Called by omap_device
2159 * code. Returns -EINVAL on error or 0 upon success.
2161 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
2163 unsigned long flags
;
2166 if (!oh
->class->sysc
||
2167 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
2170 spin_lock_irqsave(&oh
->_lock
, flags
);
2171 v
= oh
->_sysc_cache
;
2172 _disable_wakeup(oh
, &v
);
2173 _write_sysconfig(v
, oh
);
2174 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2180 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
2181 * contained in the hwmod module.
2182 * @oh: struct omap_hwmod *
2183 * @name: name of the reset line to lookup and assert
2185 * Some IP like dsp, ipu or iva contain processor that require
2186 * an HW reset line to be assert / deassert in order to enable fully
2187 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2188 * yet supported on this OMAP; otherwise, passes along the return value
2189 * from _assert_hardreset().
2191 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
2194 unsigned long flags
;
2199 spin_lock_irqsave(&oh
->_lock
, flags
);
2200 ret
= _assert_hardreset(oh
, name
);
2201 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2207 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
2208 * contained in the hwmod module.
2209 * @oh: struct omap_hwmod *
2210 * @name: name of the reset line to look up and deassert
2212 * Some IP like dsp, ipu or iva contain processor that require
2213 * an HW reset line to be assert / deassert in order to enable fully
2214 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2215 * yet supported on this OMAP; otherwise, passes along the return value
2216 * from _deassert_hardreset().
2218 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
2221 unsigned long flags
;
2226 spin_lock_irqsave(&oh
->_lock
, flags
);
2227 ret
= _deassert_hardreset(oh
, name
);
2228 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2234 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
2235 * contained in the hwmod module
2236 * @oh: struct omap_hwmod *
2237 * @name: name of the reset line to look up and read
2239 * Return the current state of the hwmod @oh's reset line named @name:
2240 * returns -EINVAL upon parameter error or if this operation
2241 * is unsupported on the current OMAP; otherwise, passes along the return
2242 * value from _read_hardreset().
2244 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
2247 unsigned long flags
;
2252 spin_lock_irqsave(&oh
->_lock
, flags
);
2253 ret
= _read_hardreset(oh
, name
);
2254 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2261 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
2262 * @classname: struct omap_hwmod_class name to search for
2263 * @fn: callback function pointer to call for each hwmod in class @classname
2264 * @user: arbitrary context data to pass to the callback function
2266 * For each omap_hwmod of class @classname, call @fn.
2267 * If the callback function returns something other than
2268 * zero, the iterator is terminated, and the callback function's return
2269 * value is passed back to the caller. Returns 0 upon success, -EINVAL
2270 * if @classname or @fn are NULL, or passes back the error code from @fn.
2272 int omap_hwmod_for_each_by_class(const char *classname
,
2273 int (*fn
)(struct omap_hwmod
*oh
,
2277 struct omap_hwmod
*temp_oh
;
2280 if (!classname
|| !fn
)
2283 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
2284 __func__
, classname
);
2286 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
2287 if (!strcmp(temp_oh
->class->name
, classname
)) {
2288 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
2289 __func__
, temp_oh
->name
);
2290 ret
= (*fn
)(temp_oh
, user
);
2297 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
2304 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
2305 * @oh: struct omap_hwmod *
2306 * @state: state that _setup() should leave the hwmod in
2308 * Sets the hwmod state that @oh will enter at the end of _setup()
2309 * (called by omap_hwmod_setup_*()). Only valid to call between
2310 * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
2311 * 0 upon success or -EINVAL if there is a problem with the arguments
2312 * or if the hwmod is in the wrong state.
2314 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
2317 unsigned long flags
;
2322 if (state
!= _HWMOD_STATE_DISABLED
&&
2323 state
!= _HWMOD_STATE_ENABLED
&&
2324 state
!= _HWMOD_STATE_IDLE
)
2327 spin_lock_irqsave(&oh
->_lock
, flags
);
2329 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
2334 oh
->_postsetup_state
= state
;
2338 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2344 * omap_hwmod_get_context_loss_count - get lost context count
2345 * @oh: struct omap_hwmod *
2347 * Query the powerdomain of of @oh to get the context loss
2348 * count for this device.
2350 * Returns the context loss count of the powerdomain assocated with @oh
2351 * upon success, or zero if no powerdomain exists for @oh.
2353 u32
omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
2355 struct powerdomain
*pwrdm
;
2358 pwrdm
= omap_hwmod_get_pwrdm(oh
);
2360 ret
= pwrdm_get_context_loss_count(pwrdm
);
2366 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
2367 * @oh: struct omap_hwmod *
2369 * Prevent the hwmod @oh from being reset during the setup process.
2370 * Intended for use by board-*.c files on boards with devices that
2371 * cannot tolerate being reset. Must be called before the hwmod has
2372 * been set up. Returns 0 upon success or negative error code upon
2375 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
2380 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
2381 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
2386 oh
->flags
|= HWMOD_INIT_NO_RESET
;