2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
140 #include <plat/common.h>
141 #include <plat/cpu.h>
142 #include "clockdomain.h"
143 #include "powerdomain.h"
144 #include <plat/clock.h>
145 #include <plat/omap_hwmod.h>
146 #include <plat/prcm.h>
148 #include "cm2xxx_3xxx.h"
149 #include "cminst44xx.h"
150 #include "prm2xxx_3xxx.h"
154 /* Maximum microseconds to wait for OMAP module to softreset */
155 #define MAX_MODULE_SOFTRESET_WAIT 10000
157 /* Name of the OMAP hwmod for the MPU */
158 #define MPU_INITIATOR_NAME "mpu"
160 /* omap_hwmod_list contains all registered struct omap_hwmods */
161 static LIST_HEAD(omap_hwmod_list
);
163 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
164 static struct omap_hwmod
*mpu_oh
;
167 /* Private functions */
170 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
171 * @oh: struct omap_hwmod *
173 * Load the current value of the hwmod OCP_SYSCONFIG register into the
174 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
175 * OCP_SYSCONFIG register or 0 upon success.
177 static int _update_sysc_cache(struct omap_hwmod
*oh
)
179 if (!oh
->class->sysc
) {
180 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
184 /* XXX ensure module interface clock is up */
186 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
188 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
189 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
195 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
196 * @v: OCP_SYSCONFIG value to write
197 * @oh: struct omap_hwmod *
199 * Write @v into the module class' OCP_SYSCONFIG register, if it has
200 * one. No return value.
202 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
204 if (!oh
->class->sysc
) {
205 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
209 /* XXX ensure module interface clock is up */
211 /* Module might have lost context, always update cache and register */
213 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
217 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
218 * @oh: struct omap_hwmod *
219 * @standbymode: MIDLEMODE field bits
220 * @v: pointer to register contents to modify
222 * Update the master standby mode bits in @v to be @standbymode for
223 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
224 * upon error or 0 upon success.
226 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
232 if (!oh
->class->sysc
||
233 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
236 if (!oh
->class->sysc
->sysc_fields
) {
237 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
241 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
242 mstandby_mask
= (0x3 << mstandby_shift
);
244 *v
&= ~mstandby_mask
;
245 *v
|= __ffs(standbymode
) << mstandby_shift
;
251 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
252 * @oh: struct omap_hwmod *
253 * @idlemode: SIDLEMODE field bits
254 * @v: pointer to register contents to modify
256 * Update the slave idle mode bits in @v to be @idlemode for the @oh
257 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
260 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
265 if (!oh
->class->sysc
||
266 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
269 if (!oh
->class->sysc
->sysc_fields
) {
270 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
274 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
275 sidle_mask
= (0x3 << sidle_shift
);
278 *v
|= __ffs(idlemode
) << sidle_shift
;
284 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
285 * @oh: struct omap_hwmod *
286 * @clockact: CLOCKACTIVITY field bits
287 * @v: pointer to register contents to modify
289 * Update the clockactivity mode bits in @v to be @clockact for the
290 * @oh hwmod. Used for additional powersaving on some modules. Does
291 * not write to the hardware. Returns -EINVAL upon error or 0 upon
294 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
299 if (!oh
->class->sysc
||
300 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
303 if (!oh
->class->sysc
->sysc_fields
) {
304 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
308 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
309 clkact_mask
= (0x3 << clkact_shift
);
312 *v
|= clockact
<< clkact_shift
;
318 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
319 * @oh: struct omap_hwmod *
320 * @v: pointer to register contents to modify
322 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
323 * error or 0 upon success.
325 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
329 if (!oh
->class->sysc
||
330 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
333 if (!oh
->class->sysc
->sysc_fields
) {
334 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
338 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
346 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
347 * @oh: struct omap_hwmod *
348 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
349 * @v: pointer to register contents to modify
351 * Update the module autoidle bit in @v to be @autoidle for the @oh
352 * hwmod. The autoidle bit controls whether the module can gate
353 * internal clocks automatically when it isn't doing anything; the
354 * exact function of this bit varies on a per-module basis. This
355 * function does not write to the hardware. Returns -EINVAL upon
356 * error or 0 upon success.
358 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
364 if (!oh
->class->sysc
||
365 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
368 if (!oh
->class->sysc
->sysc_fields
) {
369 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
373 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
374 autoidle_mask
= (0x1 << autoidle_shift
);
376 *v
&= ~autoidle_mask
;
377 *v
|= autoidle
<< autoidle_shift
;
383 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
384 * @oh: struct omap_hwmod *
386 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
387 * upon error or 0 upon success.
389 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
391 if (!oh
->class->sysc
||
392 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
393 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
394 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
397 if (!oh
->class->sysc
->sysc_fields
) {
398 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
402 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
403 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
405 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
406 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
407 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
408 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
410 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
412 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
418 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
419 * @oh: struct omap_hwmod *
421 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
422 * upon error or 0 upon success.
424 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
426 if (!oh
->class->sysc
||
427 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
428 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
429 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
432 if (!oh
->class->sysc
->sysc_fields
) {
433 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
437 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
438 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
440 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
441 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
442 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
443 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
445 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
447 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
453 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
454 * @oh: struct omap_hwmod *
456 * Prevent the hardware module @oh from entering idle while the
457 * hardare module initiator @init_oh is active. Useful when a module
458 * will be accessed by a particular initiator (e.g., if a module will
459 * be accessed by the IVA, there should be a sleepdep between the IVA
460 * initiator and the module). Only applies to modules in smart-idle
461 * mode. If the clockdomain is marked as not needing autodeps, return
462 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
463 * passes along clkdm_add_sleepdep() value upon success.
465 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
470 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
473 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
477 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
478 * @oh: struct omap_hwmod *
480 * Allow the hardware module @oh to enter idle while the hardare
481 * module initiator @init_oh is active. Useful when a module will not
482 * be accessed by a particular initiator (e.g., if a module will not
483 * be accessed by the IVA, there should be no sleepdep between the IVA
484 * initiator and the module). Only applies to modules in smart-idle
485 * mode. If the clockdomain is marked as not needing autodeps, return
486 * 0 without doing anything. Returns -EINVAL upon error or passes
487 * along clkdm_del_sleepdep() value upon success.
489 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
494 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
497 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
501 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
502 * @oh: struct omap_hwmod *
504 * Called from _init_clocks(). Populates the @oh _clk (main
505 * functional clock pointer) if a main_clk is present. Returns 0 on
506 * success or -EINVAL on error.
508 static int _init_main_clk(struct omap_hwmod
*oh
)
515 oh
->_clk
= omap_clk_get_by_name(oh
->main_clk
);
517 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
518 oh
->name
, oh
->main_clk
);
522 if (!oh
->_clk
->clkdm
)
523 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
524 oh
->main_clk
, oh
->_clk
->name
);
530 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
531 * @oh: struct omap_hwmod *
533 * Called from _init_clocks(). Populates the @oh OCP slave interface
534 * clock pointers. Returns 0 on success or -EINVAL on error.
536 static int _init_interface_clks(struct omap_hwmod
*oh
)
542 if (oh
->slaves_cnt
== 0)
545 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
546 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
551 c
= omap_clk_get_by_name(os
->clk
);
553 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
564 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
565 * @oh: struct omap_hwmod *
567 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
568 * clock pointers. Returns 0 on success or -EINVAL on error.
570 static int _init_opt_clks(struct omap_hwmod
*oh
)
572 struct omap_hwmod_opt_clk
*oc
;
577 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
578 c
= omap_clk_get_by_name(oc
->clk
);
580 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
591 * _enable_clocks - enable hwmod main clock and interface clocks
592 * @oh: struct omap_hwmod *
594 * Enables all clocks necessary for register reads and writes to succeed
595 * on the hwmod @oh. Returns 0.
597 static int _enable_clocks(struct omap_hwmod
*oh
)
601 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
604 clk_enable(oh
->_clk
);
606 if (oh
->slaves_cnt
> 0) {
607 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
608 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
609 struct clk
*c
= os
->_clk
;
611 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
616 /* The opt clocks are controlled by the device driver. */
622 * _disable_clocks - disable hwmod main clock and interface clocks
623 * @oh: struct omap_hwmod *
625 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
627 static int _disable_clocks(struct omap_hwmod
*oh
)
631 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
634 clk_disable(oh
->_clk
);
636 if (oh
->slaves_cnt
> 0) {
637 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
638 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
639 struct clk
*c
= os
->_clk
;
641 if (c
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
646 /* The opt clocks are controlled by the device driver. */
651 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
653 struct omap_hwmod_opt_clk
*oc
;
656 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
658 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
660 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
662 clk_enable(oc
->_clk
);
666 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
668 struct omap_hwmod_opt_clk
*oc
;
671 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
673 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
675 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
677 clk_disable(oc
->_clk
);
682 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
683 * @oh: struct omap_hwmod *oh
685 * Count and return the number of MPU IRQs associated with the hwmod
686 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
689 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
691 struct omap_hwmod_irq_info
*ohii
;
694 if (!oh
|| !oh
->mpu_irqs
)
698 ohii
= &oh
->mpu_irqs
[i
++];
699 } while (ohii
->irq
!= -1);
705 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
706 * @oh: struct omap_hwmod *oh
708 * Count and return the number of SDMA request lines associated with
709 * the hwmod @oh. Used to allocate struct resource data. Returns 0
712 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
714 struct omap_hwmod_dma_info
*ohdi
;
717 if (!oh
|| !oh
->sdma_reqs
)
721 ohdi
= &oh
->sdma_reqs
[i
++];
722 } while (ohdi
->dma_req
!= -1);
728 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
729 * @oh: struct omap_hwmod *oh
731 * Count and return the number of address space ranges associated with
732 * the hwmod @oh. Used to allocate struct resource data. Returns 0
735 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
737 struct omap_hwmod_addr_space
*mem
;
740 if (!os
|| !os
->addr
)
744 mem
= &os
->addr
[i
++];
745 } while (mem
->pa_start
!= mem
->pa_end
);
751 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
752 * @oh: struct omap_hwmod *
754 * Returns the array index of the OCP slave port that the MPU
755 * addresses the device on, or -EINVAL upon error or not found.
757 static int __init
_find_mpu_port_index(struct omap_hwmod
*oh
)
762 if (!oh
|| oh
->slaves_cnt
== 0)
765 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
766 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
768 if (os
->user
& OCP_USER_MPU
) {
775 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
778 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
781 return (found
) ? i
: -EINVAL
;
785 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
786 * @oh: struct omap_hwmod *
788 * Return the virtual address of the base of the register target of
789 * device @oh, or NULL on error.
791 static void __iomem
* __init
_find_mpu_rt_base(struct omap_hwmod
*oh
, u8 index
)
793 struct omap_hwmod_ocp_if
*os
;
794 struct omap_hwmod_addr_space
*mem
;
795 int i
= 0, found
= 0;
796 void __iomem
*va_start
;
798 if (!oh
|| oh
->slaves_cnt
== 0)
801 os
= oh
->slaves
[index
];
807 mem
= &os
->addr
[i
++];
808 if (mem
->flags
& ADDR_TYPE_RT
)
810 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
813 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
815 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
818 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
821 pr_debug("omap_hwmod: %s: no MPU register target found\n",
825 return (found
) ? va_start
: NULL
;
829 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
830 * @oh: struct omap_hwmod *
832 * If module is marked as SWSUP_SIDLE, force the module out of slave
833 * idle; otherwise, configure it for smart-idle. If module is marked
834 * as SWSUP_MSUSPEND, force the module out of master standby;
835 * otherwise, configure it for smart-standby. No return value.
837 static void _enable_sysc(struct omap_hwmod
*oh
)
842 if (!oh
->class->sysc
)
846 sf
= oh
->class->sysc
->sysc_flags
;
848 if (sf
& SYSC_HAS_SIDLEMODE
) {
849 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
850 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
851 _set_slave_idlemode(oh
, idlemode
, &v
);
854 if (sf
& SYSC_HAS_MIDLEMODE
) {
855 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
856 idlemode
= HWMOD_IDLEMODE_NO
;
858 if (sf
& SYSC_HAS_ENAWAKEUP
)
859 _enable_wakeup(oh
, &v
);
860 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
861 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
863 idlemode
= HWMOD_IDLEMODE_SMART
;
865 _set_master_standbymode(oh
, idlemode
, &v
);
869 * XXX The clock framework should handle this, by
870 * calling into this code. But this must wait until the
871 * clock structures are tagged with omap_hwmod entries
873 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
874 (sf
& SYSC_HAS_CLOCKACTIVITY
))
875 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
877 /* If slave is in SMARTIDLE, also enable wakeup */
878 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
879 _enable_wakeup(oh
, &v
);
881 _write_sysconfig(v
, oh
);
884 * Set the autoidle bit only after setting the smartidle bit
885 * Setting this will not have any impact on the other modules.
887 if (sf
& SYSC_HAS_AUTOIDLE
) {
888 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
890 _set_module_autoidle(oh
, idlemode
, &v
);
891 _write_sysconfig(v
, oh
);
896 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
897 * @oh: struct omap_hwmod *
899 * If module is marked as SWSUP_SIDLE, force the module into slave
900 * idle; otherwise, configure it for smart-idle. If module is marked
901 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
902 * configure it for smart-standby. No return value.
904 static void _idle_sysc(struct omap_hwmod
*oh
)
909 if (!oh
->class->sysc
)
913 sf
= oh
->class->sysc
->sysc_flags
;
915 if (sf
& SYSC_HAS_SIDLEMODE
) {
916 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
917 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
918 _set_slave_idlemode(oh
, idlemode
, &v
);
921 if (sf
& SYSC_HAS_MIDLEMODE
) {
922 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
923 idlemode
= HWMOD_IDLEMODE_FORCE
;
925 if (sf
& SYSC_HAS_ENAWAKEUP
)
926 _enable_wakeup(oh
, &v
);
927 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
928 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
930 idlemode
= HWMOD_IDLEMODE_SMART
;
932 _set_master_standbymode(oh
, idlemode
, &v
);
935 /* If slave is in SMARTIDLE, also enable wakeup */
936 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
937 _enable_wakeup(oh
, &v
);
939 _write_sysconfig(v
, oh
);
943 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
944 * @oh: struct omap_hwmod *
946 * Force the module into slave idle and master suspend. No return
949 static void _shutdown_sysc(struct omap_hwmod
*oh
)
954 if (!oh
->class->sysc
)
958 sf
= oh
->class->sysc
->sysc_flags
;
960 if (sf
& SYSC_HAS_SIDLEMODE
)
961 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
963 if (sf
& SYSC_HAS_MIDLEMODE
)
964 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
966 if (sf
& SYSC_HAS_AUTOIDLE
)
967 _set_module_autoidle(oh
, 1, &v
);
969 _write_sysconfig(v
, oh
);
973 * _lookup - find an omap_hwmod by name
974 * @name: find an omap_hwmod by name
976 * Return a pointer to an omap_hwmod by name, or NULL if not found.
978 static struct omap_hwmod
*_lookup(const char *name
)
980 struct omap_hwmod
*oh
, *temp_oh
;
984 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
985 if (!strcmp(name
, temp_oh
->name
)) {
994 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
995 * @oh: struct omap_hwmod *
997 * Convert a clockdomain name stored in a struct omap_hwmod into a
998 * clockdomain pointer, and save it into the struct omap_hwmod.
999 * return -EINVAL if clkdm_name does not exist or if the lookup failed.
1001 static int _init_clkdm(struct omap_hwmod
*oh
)
1003 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1006 if (!oh
->clkdm_name
) {
1007 pr_warning("omap_hwmod: %s: no clkdm_name\n", oh
->name
);
1011 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1013 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1014 oh
->name
, oh
->clkdm_name
);
1018 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1019 oh
->name
, oh
->clkdm_name
);
1025 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1026 * well the clockdomain.
1027 * @oh: struct omap_hwmod *
1028 * @data: not used; pass NULL
1030 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1031 * Resolves all clock names embedded in the hwmod. Returns 0 on
1032 * success, or a negative error code on failure.
1034 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1038 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1041 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1043 ret
|= _init_main_clk(oh
);
1044 ret
|= _init_interface_clks(oh
);
1045 ret
|= _init_opt_clks(oh
);
1046 ret
|= _init_clkdm(oh
);
1049 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1051 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1057 * _wait_target_ready - wait for a module to leave slave idle
1058 * @oh: struct omap_hwmod *
1060 * Wait for a module @oh to leave slave idle. Returns 0 if the module
1061 * does not have an IDLEST bit or if the module successfully leaves
1062 * slave idle; otherwise, pass along the return value of the
1063 * appropriate *_cm*_wait_module_ready() function.
1065 static int _wait_target_ready(struct omap_hwmod
*oh
)
1067 struct omap_hwmod_ocp_if
*os
;
1073 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1076 os
= oh
->slaves
[oh
->_mpu_port_index
];
1078 if (oh
->flags
& HWMOD_NO_IDLEST
)
1081 /* XXX check module SIDLEMODE */
1083 /* XXX check clock enable states */
1085 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1086 ret
= omap2_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
1087 oh
->prcm
.omap2
.idlest_reg_id
,
1088 oh
->prcm
.omap2
.idlest_idle_bit
);
1089 } else if (cpu_is_omap44xx()) {
1093 ret
= omap4_cminst_wait_module_ready(oh
->clkdm
->prcm_partition
,
1095 oh
->clkdm
->clkdm_offs
,
1096 oh
->prcm
.omap4
.clkctrl_offs
);
1105 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1106 * @oh: struct omap_hwmod *
1107 * @name: name of the reset line in the context of this hwmod
1108 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1110 * Return the bit position of the reset line that match the
1111 * input name. Return -ENOENT if not found.
1113 static u8
_lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1114 struct omap_hwmod_rst_info
*ohri
)
1118 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1119 const char *rst_line
= oh
->rst_lines
[i
].name
;
1120 if (!strcmp(rst_line
, name
)) {
1121 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1122 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1123 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1124 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1135 * _assert_hardreset - assert the HW reset line of submodules
1136 * contained in the hwmod module.
1137 * @oh: struct omap_hwmod *
1138 * @name: name of the reset line to lookup and assert
1140 * Some IP like dsp, ipu or iva contain processor that require
1141 * an HW reset line to be assert / deassert in order to enable fully
1144 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1146 struct omap_hwmod_rst_info ohri
;
1152 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1153 if (IS_ERR_VALUE(ret
))
1156 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1157 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
1159 else if (cpu_is_omap44xx())
1160 return omap4_prm_assert_hardreset(oh
->prcm
.omap4
.rstctrl_reg
,
1167 * _deassert_hardreset - deassert the HW reset line of submodules contained
1168 * in the hwmod module.
1169 * @oh: struct omap_hwmod *
1170 * @name: name of the reset line to look up and deassert
1172 * Some IP like dsp, ipu or iva contain processor that require
1173 * an HW reset line to be assert / deassert in order to enable fully
1176 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1178 struct omap_hwmod_rst_info ohri
;
1184 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1185 if (IS_ERR_VALUE(ret
))
1188 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1189 ret
= omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
1192 } else if (cpu_is_omap44xx()) {
1194 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1196 ret
= omap4_prm_deassert_hardreset(oh
->prcm
.omap4
.rstctrl_reg
,
1203 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1209 * _read_hardreset - read the HW reset line state of submodules
1210 * contained in the hwmod module
1211 * @oh: struct omap_hwmod *
1212 * @name: name of the reset line to look up and read
1214 * Return the state of the reset line.
1216 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1218 struct omap_hwmod_rst_info ohri
;
1224 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1225 if (IS_ERR_VALUE(ret
))
1228 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1229 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
1231 } else if (cpu_is_omap44xx()) {
1232 return omap4_prm_is_hardreset_asserted(oh
->prcm
.omap4
.rstctrl_reg
,
1240 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1241 * @oh: struct omap_hwmod *
1243 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1244 * enabled for this to work. Returns -EINVAL if the hwmod cannot be
1245 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1246 * the module did not reset in time, or 0 upon success.
1248 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1249 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1250 * use the SYSCONFIG softreset bit to provide the status.
1252 * Note that some IP like McBSP do have reset control but don't have
1255 static int _ocp_softreset(struct omap_hwmod
*oh
)
1261 if (!oh
->class->sysc
||
1262 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1265 /* clocks must be on for this operation */
1266 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1267 pr_warning("omap_hwmod: %s: reset can only be entered from "
1268 "enabled state\n", oh
->name
);
1272 /* For some modules, all optionnal clocks need to be enabled as well */
1273 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1274 _enable_optional_clocks(oh
);
1276 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1278 v
= oh
->_sysc_cache
;
1279 ret
= _set_softreset(oh
, &v
);
1282 _write_sysconfig(v
, oh
);
1284 if (oh
->class->sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
1285 omap_test_timeout((omap_hwmod_read(oh
,
1286 oh
->class->sysc
->syss_offs
)
1287 & SYSS_RESETDONE_MASK
),
1288 MAX_MODULE_SOFTRESET_WAIT
, c
);
1289 else if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
)
1290 omap_test_timeout(!(omap_hwmod_read(oh
,
1291 oh
->class->sysc
->sysc_offs
)
1292 & SYSC_TYPE2_SOFTRESET_MASK
),
1293 MAX_MODULE_SOFTRESET_WAIT
, c
);
1295 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1296 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1297 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1299 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1302 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1303 * _wait_target_ready() or _reset()
1306 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1309 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1310 _disable_optional_clocks(oh
);
1316 * _reset - reset an omap_hwmod
1317 * @oh: struct omap_hwmod *
1319 * Resets an omap_hwmod @oh. The default software reset mechanism for
1320 * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
1321 * bit. However, some hwmods cannot be reset via this method: some
1322 * are not targets and therefore have no OCP header registers to
1323 * access; others (like the IVA) have idiosyncratic reset sequences.
1324 * So for these relatively rare cases, custom reset code can be
1325 * supplied in the struct omap_hwmod_class .reset function pointer.
1326 * Passes along the return value from either _reset() or the custom
1327 * reset function - these must return -EINVAL if the hwmod cannot be
1328 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1329 * the module did not reset in time, or 0 upon success.
1331 static int _reset(struct omap_hwmod
*oh
)
1335 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1337 ret
= (oh
->class->reset
) ? oh
->class->reset(oh
) : _ocp_softreset(oh
);
1343 * _enable - enable an omap_hwmod
1344 * @oh: struct omap_hwmod *
1346 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1347 * register target. Returns -EINVAL if the hwmod is in the wrong
1348 * state or passes along the return value of _wait_target_ready().
1350 static int _enable(struct omap_hwmod
*oh
)
1354 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
1356 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
1357 oh
->_state
!= _HWMOD_STATE_IDLE
&&
1358 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
1359 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
1360 "from initialized, idle, or disabled state\n", oh
->name
);
1364 /* Mux pins for device runtime if populated */
1365 if (oh
->mux
&& (!oh
->mux
->enabled
||
1366 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
1367 oh
->mux
->pads_dynamic
)))
1368 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
1370 _add_initiator_dep(oh
, mpu_oh
);
1374 * If an IP contains only one HW reset line, then de-assert it in order
1375 * to allow the module state transition. Otherwise the PRCM will return
1376 * Intransition status, and the init will failed.
1378 if ((oh
->_state
== _HWMOD_STATE_INITIALIZED
||
1379 oh
->_state
== _HWMOD_STATE_DISABLED
) && oh
->rst_lines_cnt
== 1)
1380 _deassert_hardreset(oh
, oh
->rst_lines
[0].name
);
1382 r
= _wait_target_ready(oh
);
1384 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1386 _disable_clocks(oh
);
1391 oh
->_state
= _HWMOD_STATE_ENABLED
;
1393 /* Access the sysconfig only if the target is ready */
1394 if (oh
->class->sysc
) {
1395 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
1396 _update_sysc_cache(oh
);
1404 * _idle - idle an omap_hwmod
1405 * @oh: struct omap_hwmod *
1407 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1408 * no further work. Returns -EINVAL if the hwmod is in the wrong
1409 * state or returns 0.
1411 static int _idle(struct omap_hwmod
*oh
)
1413 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
1415 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1416 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
1417 "enabled state\n", oh
->name
);
1421 if (oh
->class->sysc
)
1423 _del_initiator_dep(oh
, mpu_oh
);
1424 _disable_clocks(oh
);
1426 /* Mux pins for device idle if populated */
1427 if (oh
->mux
&& oh
->mux
->pads_dynamic
)
1428 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
1430 oh
->_state
= _HWMOD_STATE_IDLE
;
1436 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1437 * @oh: struct omap_hwmod *
1438 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1440 * Sets the IP block's OCP autoidle bit in hardware, and updates our
1441 * local copy. Intended to be used by drivers that require
1442 * direct manipulation of the AUTOIDLE bits.
1443 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1444 * along the return value from _set_module_autoidle().
1446 * Any users of this function should be scrutinized carefully.
1448 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod
*oh
, u8 autoidle
)
1452 unsigned long flags
;
1454 if (!oh
|| oh
->_state
!= _HWMOD_STATE_ENABLED
)
1457 spin_lock_irqsave(&oh
->_lock
, flags
);
1459 v
= oh
->_sysc_cache
;
1461 retval
= _set_module_autoidle(oh
, autoidle
, &v
);
1464 _write_sysconfig(v
, oh
);
1466 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1472 * _shutdown - shutdown an omap_hwmod
1473 * @oh: struct omap_hwmod *
1475 * Shut down an omap_hwmod @oh. This should be called when the driver
1476 * used for the hwmod is removed or unloaded or if the driver is not
1477 * used by the system. Returns -EINVAL if the hwmod is in the wrong
1478 * state or returns 0.
1480 static int _shutdown(struct omap_hwmod
*oh
)
1485 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
1486 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1487 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
1488 "from idle, or enabled state\n", oh
->name
);
1492 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
1494 if (oh
->class->pre_shutdown
) {
1495 prev_state
= oh
->_state
;
1496 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1498 ret
= oh
->class->pre_shutdown(oh
);
1500 if (prev_state
== _HWMOD_STATE_IDLE
)
1506 if (oh
->class->sysc
) {
1507 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1512 /* clocks and deps are already disabled in idle */
1513 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
1514 _del_initiator_dep(oh
, mpu_oh
);
1515 /* XXX what about the other system initiators here? dma, dsp */
1516 _disable_clocks(oh
);
1518 /* XXX Should this code also force-disable the optional clocks? */
1521 * If an IP contains only one HW reset line, then assert it
1522 * after disabling the clocks and before shutting down the IP.
1524 if (oh
->rst_lines_cnt
== 1)
1525 _assert_hardreset(oh
, oh
->rst_lines
[0].name
);
1527 /* Mux pins to safe mode or use populated off mode values */
1529 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
1531 oh
->_state
= _HWMOD_STATE_DISABLED
;
1537 * _setup - do initial configuration of omap_hwmod
1538 * @oh: struct omap_hwmod *
1540 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
1541 * OCP_SYSCONFIG register. Returns 0.
1543 static int _setup(struct omap_hwmod
*oh
, void *data
)
1548 if (oh
->_state
!= _HWMOD_STATE_CLKS_INITED
)
1551 /* Set iclk autoidle mode */
1552 if (oh
->slaves_cnt
> 0) {
1553 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
1554 struct omap_hwmod_ocp_if
*os
= oh
->slaves
[i
];
1555 struct clk
*c
= os
->_clk
;
1560 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
1561 /* XXX omap_iclk_deny_idle(c); */
1563 /* XXX omap_iclk_allow_idle(c); */
1569 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
1572 * In the case of hwmod with hardreset that should not be
1573 * de-assert at boot time, we have to keep the module
1574 * initialized, because we cannot enable it properly with the
1575 * reset asserted. Exit without warning because that behavior is
1578 if ((oh
->flags
& HWMOD_INIT_NO_RESET
) && oh
->rst_lines_cnt
== 1)
1583 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1584 oh
->name
, oh
->_state
);
1588 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
)) {
1592 * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
1593 * The _enable() function should be split to
1594 * avoid the rewrite of the OCP_SYSCONFIG register.
1596 if (oh
->class->sysc
) {
1597 _update_sysc_cache(oh
);
1602 postsetup_state
= oh
->_postsetup_state
;
1603 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
1604 postsetup_state
= _HWMOD_STATE_ENABLED
;
1607 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
1608 * it should be set by the core code as a runtime flag during startup
1610 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
1611 (postsetup_state
== _HWMOD_STATE_IDLE
))
1612 postsetup_state
= _HWMOD_STATE_ENABLED
;
1614 if (postsetup_state
== _HWMOD_STATE_IDLE
)
1616 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
1618 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
1619 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
1620 oh
->name
, postsetup_state
);
1626 * _register - register a struct omap_hwmod
1627 * @oh: struct omap_hwmod *
1629 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1630 * already has been registered by the same name; -EINVAL if the
1631 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1632 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1633 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1636 * XXX The data should be copied into bootmem, so the original data
1637 * should be marked __initdata and freed after init. This would allow
1638 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1639 * that the copy process would be relatively complex due to the large number
1642 static int __init
_register(struct omap_hwmod
*oh
)
1646 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
1647 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
1650 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
1652 if (_lookup(oh
->name
))
1655 ms_id
= _find_mpu_port_index(oh
);
1656 if (!IS_ERR_VALUE(ms_id
))
1657 oh
->_mpu_port_index
= ms_id
;
1659 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1661 list_add_tail(&oh
->node
, &omap_hwmod_list
);
1663 spin_lock_init(&oh
->_lock
);
1665 oh
->_state
= _HWMOD_STATE_REGISTERED
;
1668 * XXX Rather than doing a strcmp(), this should test a flag
1669 * set in the hwmod data, inserted by the autogenerator code.
1671 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
1678 /* Public functions */
1680 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
1682 if (oh
->flags
& HWMOD_16BIT_REG
)
1683 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
1685 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
1688 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
1690 if (oh
->flags
& HWMOD_16BIT_REG
)
1691 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
1693 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
1697 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
1698 * @oh: struct omap_hwmod *
1700 * This is a public function exposed to drivers. Some drivers may need to do
1701 * some settings before and after resetting the device. Those drivers after
1702 * doing the necessary settings could use this function to start a reset by
1703 * setting the SYSCONFIG.SOFTRESET bit.
1705 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
1710 if (!oh
|| !(oh
->_sysc_cache
))
1713 v
= oh
->_sysc_cache
;
1714 ret
= _set_softreset(oh
, &v
);
1717 _write_sysconfig(v
, oh
);
1724 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
1725 * @oh: struct omap_hwmod *
1726 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
1728 * Sets the IP block's OCP slave idlemode in hardware, and updates our
1729 * local copy. Intended to be used by drivers that have some erratum
1730 * that requires direct manipulation of the SIDLEMODE bits. Returns
1731 * -EINVAL if @oh is null, or passes along the return value from
1732 * _set_slave_idlemode().
1734 * XXX Does this function have any current users? If not, we should
1735 * remove it; it is better to let the rest of the hwmod code handle this.
1736 * Any users of this function should be scrutinized carefully.
1738 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
1746 v
= oh
->_sysc_cache
;
1748 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
1750 _write_sysconfig(v
, oh
);
1756 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1757 * @name: name of the omap_hwmod to look up
1759 * Given a @name of an omap_hwmod, return a pointer to the registered
1760 * struct omap_hwmod *, or NULL upon error.
1762 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
1764 struct omap_hwmod
*oh
;
1775 * omap_hwmod_for_each - call function for each registered omap_hwmod
1776 * @fn: pointer to a callback function
1777 * @data: void * data to pass to callback function
1779 * Call @fn for each registered omap_hwmod, passing @data to each
1780 * function. @fn must return 0 for success or any other value for
1781 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1782 * will stop and the non-zero return value will be passed to the
1783 * caller of omap_hwmod_for_each(). @fn is called with
1784 * omap_hwmod_for_each() held.
1786 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
1789 struct omap_hwmod
*temp_oh
;
1795 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1796 ret
= (*fn
)(temp_oh
, data
);
1805 * omap_hwmod_register - register an array of hwmods
1806 * @ohs: pointer to an array of omap_hwmods to register
1808 * Intended to be called early in boot before the clock framework is
1809 * initialized. If @ohs is not null, will register all omap_hwmods
1810 * listed in @ohs that are valid for this chip. Returns 0.
1812 int __init
omap_hwmod_register(struct omap_hwmod
**ohs
)
1821 if (!omap_chip_is(ohs
[i
]->omap_chip
))
1824 r
= _register(ohs
[i
]);
1825 WARN(r
, "omap_hwmod: %s: _register returned %d\n", ohs
[i
]->name
,
1833 * _populate_mpu_rt_base - populate the virtual address for a hwmod
1835 * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
1836 * Assumes the caller takes care of locking if needed.
1838 static int __init
_populate_mpu_rt_base(struct omap_hwmod
*oh
, void *data
)
1840 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1843 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1846 oh
->_mpu_rt_va
= _find_mpu_rt_base(oh
, oh
->_mpu_port_index
);
1852 * omap_hwmod_setup_one - set up a single hwmod
1853 * @oh_name: const char * name of the already-registered hwmod to set up
1855 * Must be called after omap2_clk_init(). Resolves the struct clk
1856 * names to struct clk pointers for each registered omap_hwmod. Also
1857 * calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
1860 int __init
omap_hwmod_setup_one(const char *oh_name
)
1862 struct omap_hwmod
*oh
;
1865 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
1868 pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
1869 oh_name
, MPU_INITIATOR_NAME
);
1873 oh
= _lookup(oh_name
);
1875 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
1879 if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
1880 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
1882 r
= _populate_mpu_rt_base(oh
, NULL
);
1883 if (IS_ERR_VALUE(r
)) {
1884 WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name
);
1888 r
= _init_clocks(oh
, NULL
);
1889 if (IS_ERR_VALUE(r
)) {
1890 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name
);
1900 * omap_hwmod_setup - do some post-clock framework initialization
1902 * Must be called after omap2_clk_init(). Resolves the struct clk names
1903 * to struct clk pointers for each registered omap_hwmod. Also calls
1904 * _setup() on each hwmod. Returns 0 upon success.
1906 static int __init
omap_hwmod_setup_all(void)
1911 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
1912 __func__
, MPU_INITIATOR_NAME
);
1916 r
= omap_hwmod_for_each(_populate_mpu_rt_base
, NULL
);
1918 r
= omap_hwmod_for_each(_init_clocks
, NULL
);
1919 WARN(IS_ERR_VALUE(r
),
1920 "omap_hwmod: %s: _init_clocks failed\n", __func__
);
1922 omap_hwmod_for_each(_setup
, NULL
);
1926 core_initcall(omap_hwmod_setup_all
);
1929 * omap_hwmod_enable - enable an omap_hwmod
1930 * @oh: struct omap_hwmod *
1932 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
1933 * Returns -EINVAL on error or passes along the return value from _enable().
1935 int omap_hwmod_enable(struct omap_hwmod
*oh
)
1938 unsigned long flags
;
1943 spin_lock_irqsave(&oh
->_lock
, flags
);
1945 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1951 * omap_hwmod_idle - idle an omap_hwmod
1952 * @oh: struct omap_hwmod *
1954 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
1955 * Returns -EINVAL on error or passes along the return value from _idle().
1957 int omap_hwmod_idle(struct omap_hwmod
*oh
)
1959 unsigned long flags
;
1964 spin_lock_irqsave(&oh
->_lock
, flags
);
1966 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1972 * omap_hwmod_shutdown - shutdown an omap_hwmod
1973 * @oh: struct omap_hwmod *
1975 * Shutdown an omap_hwmod @oh. Intended to be called by
1976 * omap_device_shutdown(). Returns -EINVAL on error or passes along
1977 * the return value from _shutdown().
1979 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
1981 unsigned long flags
;
1986 spin_lock_irqsave(&oh
->_lock
, flags
);
1988 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1994 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
1995 * @oh: struct omap_hwmod *oh
1997 * Intended to be called by the omap_device code.
1999 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
2001 unsigned long flags
;
2003 spin_lock_irqsave(&oh
->_lock
, flags
);
2005 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2011 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
2012 * @oh: struct omap_hwmod *oh
2014 * Intended to be called by the omap_device code.
2016 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
2018 unsigned long flags
;
2020 spin_lock_irqsave(&oh
->_lock
, flags
);
2021 _disable_clocks(oh
);
2022 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2028 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
2029 * @oh: struct omap_hwmod *oh
2031 * Intended to be called by drivers and core code when all posted
2032 * writes to a device must complete before continuing further
2033 * execution (for example, after clearing some device IRQSTATUS
2036 * XXX what about targets with multiple OCP threads?
2038 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
2042 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
2043 WARN(1, "omap_device: %s: OCP barrier impossible due to "
2044 "device configuration\n", oh
->name
);
2049 * Forces posted writes to complete on the OCP thread handling
2052 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
2056 * omap_hwmod_reset - reset the hwmod
2057 * @oh: struct omap_hwmod *
2059 * Under some conditions, a driver may wish to reset the entire device.
2060 * Called from omap_device code. Returns -EINVAL on error or passes along
2061 * the return value from _reset().
2063 int omap_hwmod_reset(struct omap_hwmod
*oh
)
2066 unsigned long flags
;
2071 spin_lock_irqsave(&oh
->_lock
, flags
);
2073 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2079 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
2080 * @oh: struct omap_hwmod *
2081 * @res: pointer to the first element of an array of struct resource to fill
2083 * Count the number of struct resource array elements necessary to
2084 * contain omap_hwmod @oh resources. Intended to be called by code
2085 * that registers omap_devices. Intended to be used to determine the
2086 * size of a dynamically-allocated struct resource array, before
2087 * calling omap_hwmod_fill_resources(). Returns the number of struct
2088 * resource array elements needed.
2090 * XXX This code is not optimized. It could attempt to merge adjacent
2094 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
2098 ret
= _count_mpu_irqs(oh
) + _count_sdma_reqs(oh
);
2100 for (i
= 0; i
< oh
->slaves_cnt
; i
++)
2101 ret
+= _count_ocp_if_addr_spaces(oh
->slaves
[i
]);
2107 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
2108 * @oh: struct omap_hwmod *
2109 * @res: pointer to the first element of an array of struct resource to fill
2111 * Fill the struct resource array @res with resource data from the
2112 * omap_hwmod @oh. Intended to be called by code that registers
2113 * omap_devices. See also omap_hwmod_count_resources(). Returns the
2114 * number of array elements filled.
2116 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
2118 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
;
2121 /* For each IRQ, DMA, memory area, fill in array.*/
2123 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
2124 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
2125 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
2126 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
2127 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
2128 (res
+ r
)->flags
= IORESOURCE_IRQ
;
2132 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
2133 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
2134 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
2135 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
2136 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
2137 (res
+ r
)->flags
= IORESOURCE_DMA
;
2141 for (i
= 0; i
< oh
->slaves_cnt
; i
++) {
2142 struct omap_hwmod_ocp_if
*os
;
2146 addr_cnt
= _count_ocp_if_addr_spaces(os
);
2148 for (j
= 0; j
< addr_cnt
; j
++) {
2149 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
2150 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
2151 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
2152 (res
+ r
)->flags
= IORESOURCE_MEM
;
2161 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2162 * @oh: struct omap_hwmod *
2164 * Return the powerdomain pointer associated with the OMAP module
2165 * @oh's main clock. If @oh does not have a main clk, return the
2166 * powerdomain associated with the interface clock associated with the
2167 * module's MPU port. (XXX Perhaps this should use the SDMA port
2168 * instead?) Returns NULL on error, or a struct powerdomain * on
2171 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
2181 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2183 c
= oh
->slaves
[oh
->_mpu_port_index
]->_clk
;
2189 return c
->clkdm
->pwrdm
.ptr
;
2194 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
2195 * @oh: struct omap_hwmod *
2197 * Returns the virtual address corresponding to the beginning of the
2198 * module's register target, in the address range that is intended to
2199 * be used by the MPU. Returns the virtual address upon success or NULL
2202 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
2207 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2210 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
2213 return oh
->_mpu_rt_va
;
2217 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
2218 * @oh: struct omap_hwmod *
2219 * @init_oh: struct omap_hwmod * (initiator)
2221 * Add a sleep dependency between the initiator @init_oh and @oh.
2222 * Intended to be called by DSP/Bridge code via platform_data for the
2223 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2224 * code needs to add/del initiator dependencies dynamically
2225 * before/after accessing a device. Returns the return value from
2226 * _add_initiator_dep().
2228 * XXX Keep a usecount in the clockdomain code
2230 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
2231 struct omap_hwmod
*init_oh
)
2233 return _add_initiator_dep(oh
, init_oh
);
2237 * XXX what about functions for drivers to save/restore ocp_sysconfig
2238 * for context save/restore operations?
2242 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
2243 * @oh: struct omap_hwmod *
2244 * @init_oh: struct omap_hwmod * (initiator)
2246 * Remove a sleep dependency between the initiator @init_oh and @oh.
2247 * Intended to be called by DSP/Bridge code via platform_data for the
2248 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2249 * code needs to add/del initiator dependencies dynamically
2250 * before/after accessing a device. Returns the return value from
2251 * _del_initiator_dep().
2253 * XXX Keep a usecount in the clockdomain code
2255 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
2256 struct omap_hwmod
*init_oh
)
2258 return _del_initiator_dep(oh
, init_oh
);
2262 * omap_hwmod_enable_wakeup - allow device to wake up the system
2263 * @oh: struct omap_hwmod *
2265 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
2266 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
2267 * registers to cause the PRCM to receive wakeup events from the
2268 * module. Does not set any wakeup routing registers beyond this
2269 * point - if the module is to wake up any other module or subsystem,
2270 * that must be set separately. Called by omap_device code. Returns
2271 * -EINVAL on error or 0 upon success.
2273 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
2275 unsigned long flags
;
2278 if (!oh
->class->sysc
||
2279 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
2282 spin_lock_irqsave(&oh
->_lock
, flags
);
2283 v
= oh
->_sysc_cache
;
2284 _enable_wakeup(oh
, &v
);
2285 _write_sysconfig(v
, oh
);
2286 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2292 * omap_hwmod_disable_wakeup - prevent device from waking the system
2293 * @oh: struct omap_hwmod *
2295 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
2296 * from sending wakeups to the PRCM. Eventually this should clear
2297 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
2298 * from the module. Does not set any wakeup routing registers beyond
2299 * this point - if the module is to wake up any other module or
2300 * subsystem, that must be set separately. Called by omap_device
2301 * code. Returns -EINVAL on error or 0 upon success.
2303 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
2305 unsigned long flags
;
2308 if (!oh
->class->sysc
||
2309 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
))
2312 spin_lock_irqsave(&oh
->_lock
, flags
);
2313 v
= oh
->_sysc_cache
;
2314 _disable_wakeup(oh
, &v
);
2315 _write_sysconfig(v
, oh
);
2316 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2322 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
2323 * contained in the hwmod module.
2324 * @oh: struct omap_hwmod *
2325 * @name: name of the reset line to lookup and assert
2327 * Some IP like dsp, ipu or iva contain processor that require
2328 * an HW reset line to be assert / deassert in order to enable fully
2329 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2330 * yet supported on this OMAP; otherwise, passes along the return value
2331 * from _assert_hardreset().
2333 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
2336 unsigned long flags
;
2341 spin_lock_irqsave(&oh
->_lock
, flags
);
2342 ret
= _assert_hardreset(oh
, name
);
2343 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2349 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
2350 * contained in the hwmod module.
2351 * @oh: struct omap_hwmod *
2352 * @name: name of the reset line to look up and deassert
2354 * Some IP like dsp, ipu or iva contain processor that require
2355 * an HW reset line to be assert / deassert in order to enable fully
2356 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2357 * yet supported on this OMAP; otherwise, passes along the return value
2358 * from _deassert_hardreset().
2360 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
2363 unsigned long flags
;
2368 spin_lock_irqsave(&oh
->_lock
, flags
);
2369 ret
= _deassert_hardreset(oh
, name
);
2370 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2376 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
2377 * contained in the hwmod module
2378 * @oh: struct omap_hwmod *
2379 * @name: name of the reset line to look up and read
2381 * Return the current state of the hwmod @oh's reset line named @name:
2382 * returns -EINVAL upon parameter error or if this operation
2383 * is unsupported on the current OMAP; otherwise, passes along the return
2384 * value from _read_hardreset().
2386 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
2389 unsigned long flags
;
2394 spin_lock_irqsave(&oh
->_lock
, flags
);
2395 ret
= _read_hardreset(oh
, name
);
2396 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2403 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
2404 * @classname: struct omap_hwmod_class name to search for
2405 * @fn: callback function pointer to call for each hwmod in class @classname
2406 * @user: arbitrary context data to pass to the callback function
2408 * For each omap_hwmod of class @classname, call @fn.
2409 * If the callback function returns something other than
2410 * zero, the iterator is terminated, and the callback function's return
2411 * value is passed back to the caller. Returns 0 upon success, -EINVAL
2412 * if @classname or @fn are NULL, or passes back the error code from @fn.
2414 int omap_hwmod_for_each_by_class(const char *classname
,
2415 int (*fn
)(struct omap_hwmod
*oh
,
2419 struct omap_hwmod
*temp_oh
;
2422 if (!classname
|| !fn
)
2425 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
2426 __func__
, classname
);
2428 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
2429 if (!strcmp(temp_oh
->class->name
, classname
)) {
2430 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
2431 __func__
, temp_oh
->name
);
2432 ret
= (*fn
)(temp_oh
, user
);
2439 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
2446 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
2447 * @oh: struct omap_hwmod *
2448 * @state: state that _setup() should leave the hwmod in
2450 * Sets the hwmod state that @oh will enter at the end of _setup()
2451 * (called by omap_hwmod_setup_*()). Only valid to call between
2452 * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
2453 * 0 upon success or -EINVAL if there is a problem with the arguments
2454 * or if the hwmod is in the wrong state.
2456 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
2459 unsigned long flags
;
2464 if (state
!= _HWMOD_STATE_DISABLED
&&
2465 state
!= _HWMOD_STATE_ENABLED
&&
2466 state
!= _HWMOD_STATE_IDLE
)
2469 spin_lock_irqsave(&oh
->_lock
, flags
);
2471 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
2476 oh
->_postsetup_state
= state
;
2480 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2486 * omap_hwmod_get_context_loss_count - get lost context count
2487 * @oh: struct omap_hwmod *
2489 * Query the powerdomain of of @oh to get the context loss
2490 * count for this device.
2492 * Returns the context loss count of the powerdomain assocated with @oh
2493 * upon success, or zero if no powerdomain exists for @oh.
2495 u32
omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
2497 struct powerdomain
*pwrdm
;
2500 pwrdm
= omap_hwmod_get_pwrdm(oh
);
2502 ret
= pwrdm_get_context_loss_count(pwrdm
);
2508 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
2509 * @oh: struct omap_hwmod *
2511 * Prevent the hwmod @oh from being reset during the setup process.
2512 * Intended for use by board-*.c files on boards with devices that
2513 * cannot tolerate being reset. Must be called before the hwmod has
2514 * been set up. Returns 0 upon success or negative error code upon
2517 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
2522 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
2523 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
2528 oh
->flags
|= HWMOD_INIT_NO_RESET
;