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"
152 #include "prminst44xx.h"
155 /* Maximum microseconds to wait for OMAP module to softreset */
156 #define MAX_MODULE_SOFTRESET_WAIT 10000
158 /* Name of the OMAP hwmod for the MPU */
159 #define MPU_INITIATOR_NAME "mpu"
161 /* omap_hwmod_list contains all registered struct omap_hwmods */
162 static LIST_HEAD(omap_hwmod_list);
164 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
165 static struct omap_hwmod *mpu_oh;
168 /* Private functions */
171 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
172 * @oh: struct omap_hwmod *
174 * Load the current value of the hwmod OCP_SYSCONFIG register into the
175 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
176 * OCP_SYSCONFIG register or 0 upon success.
178 static int _update_sysc_cache(struct omap_hwmod *oh)
180 if (!oh->class->sysc) {
181 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
185 /* XXX ensure module interface clock is up */
187 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
189 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
190 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
196 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
197 * @v: OCP_SYSCONFIG value to write
198 * @oh: struct omap_hwmod *
200 * Write @v into the module class' OCP_SYSCONFIG register, if it has
201 * one. No return value.
203 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
205 if (!oh->class->sysc) {
206 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
210 /* XXX ensure module interface clock is up */
212 /* Module might have lost context, always update cache and register */
214 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
218 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
219 * @oh: struct omap_hwmod *
220 * @standbymode: MIDLEMODE field bits
221 * @v: pointer to register contents to modify
223 * Update the master standby mode bits in @v to be @standbymode for
224 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
225 * upon error or 0 upon success.
227 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
233 if (!oh->class->sysc ||
234 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
237 if (!oh->class->sysc->sysc_fields) {
238 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
242 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
243 mstandby_mask = (0x3 << mstandby_shift);
245 *v &= ~mstandby_mask;
246 *v |= __ffs(standbymode) << mstandby_shift;
252 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
253 * @oh: struct omap_hwmod *
254 * @idlemode: SIDLEMODE field bits
255 * @v: pointer to register contents to modify
257 * Update the slave idle mode bits in @v to be @idlemode for the @oh
258 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
261 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
266 if (!oh->class->sysc ||
267 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
270 if (!oh->class->sysc->sysc_fields) {
271 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
275 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
276 sidle_mask = (0x3 << sidle_shift);
279 *v |= __ffs(idlemode) << sidle_shift;
285 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
286 * @oh: struct omap_hwmod *
287 * @clockact: CLOCKACTIVITY field bits
288 * @v: pointer to register contents to modify
290 * Update the clockactivity mode bits in @v to be @clockact for the
291 * @oh hwmod. Used for additional powersaving on some modules. Does
292 * not write to the hardware. Returns -EINVAL upon error or 0 upon
295 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
300 if (!oh->class->sysc ||
301 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
304 if (!oh->class->sysc->sysc_fields) {
305 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
309 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
310 clkact_mask = (0x3 << clkact_shift);
313 *v |= clockact << clkact_shift;
319 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
320 * @oh: struct omap_hwmod *
321 * @v: pointer to register contents to modify
323 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
324 * error or 0 upon success.
326 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
330 if (!oh->class->sysc ||
331 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
334 if (!oh->class->sysc->sysc_fields) {
335 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
339 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
347 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
348 * @oh: struct omap_hwmod *
349 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
350 * @v: pointer to register contents to modify
352 * Update the module autoidle bit in @v to be @autoidle for the @oh
353 * hwmod. The autoidle bit controls whether the module can gate
354 * internal clocks automatically when it isn't doing anything; the
355 * exact function of this bit varies on a per-module basis. This
356 * function does not write to the hardware. Returns -EINVAL upon
357 * error or 0 upon success.
359 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
365 if (!oh->class->sysc ||
366 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
369 if (!oh->class->sysc->sysc_fields) {
370 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
374 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
375 autoidle_mask = (0x1 << autoidle_shift);
377 *v &= ~autoidle_mask;
378 *v |= autoidle << autoidle_shift;
384 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
385 * @oh: struct omap_hwmod *
387 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
388 * upon error or 0 upon success.
390 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
392 if (!oh->class->sysc ||
393 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
394 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
395 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
398 if (!oh->class->sysc->sysc_fields) {
399 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
403 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
404 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
406 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
407 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
408 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
409 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
411 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
413 oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
419 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
420 * @oh: struct omap_hwmod *
422 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
423 * upon error or 0 upon success.
425 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
427 if (!oh->class->sysc ||
428 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
429 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
430 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
433 if (!oh->class->sysc->sysc_fields) {
434 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
438 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
439 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
441 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
442 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
443 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
444 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
446 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
448 oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
454 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
455 * @oh: struct omap_hwmod *
457 * Prevent the hardware module @oh from entering idle while the
458 * hardare module initiator @init_oh is active. Useful when a module
459 * will be accessed by a particular initiator (e.g., if a module will
460 * be accessed by the IVA, there should be a sleepdep between the IVA
461 * initiator and the module). Only applies to modules in smart-idle
462 * mode. If the clockdomain is marked as not needing autodeps, return
463 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
464 * passes along clkdm_add_sleepdep() value upon success.
466 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
471 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
474 return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
478 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
479 * @oh: struct omap_hwmod *
481 * Allow the hardware module @oh to enter idle while the hardare
482 * module initiator @init_oh is active. Useful when a module will not
483 * be accessed by a particular initiator (e.g., if a module will not
484 * be accessed by the IVA, there should be no sleepdep between the IVA
485 * initiator and the module). Only applies to modules in smart-idle
486 * mode. If the clockdomain is marked as not needing autodeps, return
487 * 0 without doing anything. Returns -EINVAL upon error or passes
488 * along clkdm_del_sleepdep() value upon success.
490 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
495 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
498 return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
502 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
503 * @oh: struct omap_hwmod *
505 * Called from _init_clocks(). Populates the @oh _clk (main
506 * functional clock pointer) if a main_clk is present. Returns 0 on
507 * success or -EINVAL on error.
509 static int _init_main_clk(struct omap_hwmod *oh)
516 oh->_clk = omap_clk_get_by_name(oh->main_clk);
518 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
519 oh->name, oh->main_clk);
523 if (!oh->_clk->clkdm)
524 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
525 oh->main_clk, oh->_clk->name);
531 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
532 * @oh: struct omap_hwmod *
534 * Called from _init_clocks(). Populates the @oh OCP slave interface
535 * clock pointers. Returns 0 on success or -EINVAL on error.
537 static int _init_interface_clks(struct omap_hwmod *oh)
543 if (oh->slaves_cnt == 0)
546 for (i = 0; i < oh->slaves_cnt; i++) {
547 struct omap_hwmod_ocp_if *os = oh->slaves[i];
552 c = omap_clk_get_by_name(os->clk);
554 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
565 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
566 * @oh: struct omap_hwmod *
568 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
569 * clock pointers. Returns 0 on success or -EINVAL on error.
571 static int _init_opt_clks(struct omap_hwmod *oh)
573 struct omap_hwmod_opt_clk *oc;
578 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
579 c = omap_clk_get_by_name(oc->clk);
581 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
592 * _enable_clocks - enable hwmod main clock and interface clocks
593 * @oh: struct omap_hwmod *
595 * Enables all clocks necessary for register reads and writes to succeed
596 * on the hwmod @oh. Returns 0.
598 static int _enable_clocks(struct omap_hwmod *oh)
602 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
605 clk_enable(oh->_clk);
607 if (oh->slaves_cnt > 0) {
608 for (i = 0; i < oh->slaves_cnt; i++) {
609 struct omap_hwmod_ocp_if *os = oh->slaves[i];
610 struct clk *c = os->_clk;
612 if (c && (os->flags & OCPIF_SWSUP_IDLE))
617 /* The opt clocks are controlled by the device driver. */
623 * _disable_clocks - disable hwmod main clock and interface clocks
624 * @oh: struct omap_hwmod *
626 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
628 static int _disable_clocks(struct omap_hwmod *oh)
632 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
635 clk_disable(oh->_clk);
637 if (oh->slaves_cnt > 0) {
638 for (i = 0; i < oh->slaves_cnt; i++) {
639 struct omap_hwmod_ocp_if *os = oh->slaves[i];
640 struct clk *c = os->_clk;
642 if (c && (os->flags & OCPIF_SWSUP_IDLE))
647 /* The opt clocks are controlled by the device driver. */
652 static void _enable_optional_clocks(struct omap_hwmod *oh)
654 struct omap_hwmod_opt_clk *oc;
657 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
659 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
661 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
663 clk_enable(oc->_clk);
667 static void _disable_optional_clocks(struct omap_hwmod *oh)
669 struct omap_hwmod_opt_clk *oc;
672 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
674 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
676 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
678 clk_disable(oc->_clk);
683 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
684 * @oh: struct omap_hwmod *oh
686 * Count and return the number of MPU IRQs associated with the hwmod
687 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
690 static int _count_mpu_irqs(struct omap_hwmod *oh)
692 struct omap_hwmod_irq_info *ohii;
695 if (!oh || !oh->mpu_irqs)
699 ohii = &oh->mpu_irqs[i++];
700 } while (ohii->irq != -1);
706 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
707 * @oh: struct omap_hwmod *oh
709 * Count and return the number of SDMA request lines associated with
710 * the hwmod @oh. Used to allocate struct resource data. Returns 0
713 static int _count_sdma_reqs(struct omap_hwmod *oh)
715 struct omap_hwmod_dma_info *ohdi;
718 if (!oh || !oh->sdma_reqs)
722 ohdi = &oh->sdma_reqs[i++];
723 } while (ohdi->dma_req != -1);
729 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
730 * @oh: struct omap_hwmod *oh
732 * Count and return the number of address space ranges associated with
733 * the hwmod @oh. Used to allocate struct resource data. Returns 0
736 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
738 struct omap_hwmod_addr_space *mem;
741 if (!os || !os->addr)
745 mem = &os->addr[i++];
746 } while (mem->pa_start != mem->pa_end);
752 * _find_mpu_port_index - find hwmod OCP slave port ID intended for MPU use
753 * @oh: struct omap_hwmod *
755 * Returns the array index of the OCP slave port that the MPU
756 * addresses the device on, or -EINVAL upon error or not found.
758 static int __init _find_mpu_port_index(struct omap_hwmod *oh)
763 if (!oh || oh->slaves_cnt == 0)
766 for (i = 0; i < oh->slaves_cnt; i++) {
767 struct omap_hwmod_ocp_if *os = oh->slaves[i];
769 if (os->user & OCP_USER_MPU) {
776 pr_debug("omap_hwmod: %s: MPU OCP slave port ID %d\n",
779 pr_debug("omap_hwmod: %s: no MPU OCP slave port found\n",
782 return (found) ? i : -EINVAL;
786 * _find_mpu_rt_base - find hwmod register target base addr accessible by MPU
787 * @oh: struct omap_hwmod *
789 * Return the virtual address of the base of the register target of
790 * device @oh, or NULL on error.
792 static void __iomem * __init _find_mpu_rt_base(struct omap_hwmod *oh, u8 index)
794 struct omap_hwmod_ocp_if *os;
795 struct omap_hwmod_addr_space *mem;
796 int i = 0, found = 0;
797 void __iomem *va_start;
799 if (!oh || oh->slaves_cnt == 0)
802 os = oh->slaves[index];
808 mem = &os->addr[i++];
809 if (mem->flags & ADDR_TYPE_RT)
811 } while (!found && mem->pa_start != mem->pa_end);
814 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
816 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
819 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
822 pr_debug("omap_hwmod: %s: no MPU register target found\n",
826 return (found) ? va_start : NULL;
830 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
831 * @oh: struct omap_hwmod *
833 * If module is marked as SWSUP_SIDLE, force the module out of slave
834 * idle; otherwise, configure it for smart-idle. If module is marked
835 * as SWSUP_MSUSPEND, force the module out of master standby;
836 * otherwise, configure it for smart-standby. No return value.
838 static void _enable_sysc(struct omap_hwmod *oh)
843 if (!oh->class->sysc)
847 sf = oh->class->sysc->sysc_flags;
849 if (sf & SYSC_HAS_SIDLEMODE) {
850 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
851 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
852 _set_slave_idlemode(oh, idlemode, &v);
855 if (sf & SYSC_HAS_MIDLEMODE) {
856 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
857 idlemode = HWMOD_IDLEMODE_NO;
859 if (sf & SYSC_HAS_ENAWAKEUP)
860 _enable_wakeup(oh, &v);
861 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
862 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
864 idlemode = HWMOD_IDLEMODE_SMART;
866 _set_master_standbymode(oh, idlemode, &v);
870 * XXX The clock framework should handle this, by
871 * calling into this code. But this must wait until the
872 * clock structures are tagged with omap_hwmod entries
874 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
875 (sf & SYSC_HAS_CLOCKACTIVITY))
876 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
878 /* If slave is in SMARTIDLE, also enable wakeup */
879 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
880 _enable_wakeup(oh, &v);
882 _write_sysconfig(v, oh);
885 * Set the autoidle bit only after setting the smartidle bit
886 * Setting this will not have any impact on the other modules.
888 if (sf & SYSC_HAS_AUTOIDLE) {
889 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
891 _set_module_autoidle(oh, idlemode, &v);
892 _write_sysconfig(v, oh);
897 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
898 * @oh: struct omap_hwmod *
900 * If module is marked as SWSUP_SIDLE, force the module into slave
901 * idle; otherwise, configure it for smart-idle. If module is marked
902 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
903 * configure it for smart-standby. No return value.
905 static void _idle_sysc(struct omap_hwmod *oh)
910 if (!oh->class->sysc)
914 sf = oh->class->sysc->sysc_flags;
916 if (sf & SYSC_HAS_SIDLEMODE) {
917 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
918 HWMOD_IDLEMODE_FORCE : HWMOD_IDLEMODE_SMART;
919 _set_slave_idlemode(oh, idlemode, &v);
922 if (sf & SYSC_HAS_MIDLEMODE) {
923 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
924 idlemode = HWMOD_IDLEMODE_FORCE;
926 if (sf & SYSC_HAS_ENAWAKEUP)
927 _enable_wakeup(oh, &v);
928 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
929 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
931 idlemode = HWMOD_IDLEMODE_SMART;
933 _set_master_standbymode(oh, idlemode, &v);
936 /* If slave is in SMARTIDLE, also enable wakeup */
937 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
938 _enable_wakeup(oh, &v);
940 _write_sysconfig(v, oh);
944 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
945 * @oh: struct omap_hwmod *
947 * Force the module into slave idle and master suspend. No return
950 static void _shutdown_sysc(struct omap_hwmod *oh)
955 if (!oh->class->sysc)
959 sf = oh->class->sysc->sysc_flags;
961 if (sf & SYSC_HAS_SIDLEMODE)
962 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
964 if (sf & SYSC_HAS_MIDLEMODE)
965 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
967 if (sf & SYSC_HAS_AUTOIDLE)
968 _set_module_autoidle(oh, 1, &v);
970 _write_sysconfig(v, oh);
974 * _lookup - find an omap_hwmod by name
975 * @name: find an omap_hwmod by name
977 * Return a pointer to an omap_hwmod by name, or NULL if not found.
979 static struct omap_hwmod *_lookup(const char *name)
981 struct omap_hwmod *oh, *temp_oh;
985 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
986 if (!strcmp(name, temp_oh->name)) {
995 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
996 * @oh: struct omap_hwmod *
998 * Convert a clockdomain name stored in a struct omap_hwmod into a
999 * clockdomain pointer, and save it into the struct omap_hwmod.
1000 * return -EINVAL if clkdm_name does not exist or if the lookup failed.
1002 static int _init_clkdm(struct omap_hwmod *oh)
1004 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1007 if (!oh->clkdm_name) {
1008 pr_warning("omap_hwmod: %s: no clkdm_name\n", oh->name);
1012 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1014 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1015 oh->name, oh->clkdm_name);
1019 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1020 oh->name, oh->clkdm_name);
1026 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1027 * well the clockdomain.
1028 * @oh: struct omap_hwmod *
1029 * @data: not used; pass NULL
1031 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1032 * Resolves all clock names embedded in the hwmod. Returns 0 on
1033 * success, or a negative error code on failure.
1035 static int _init_clocks(struct omap_hwmod *oh, void *data)
1039 if (oh->_state != _HWMOD_STATE_REGISTERED)
1042 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1044 ret |= _init_main_clk(oh);
1045 ret |= _init_interface_clks(oh);
1046 ret |= _init_opt_clks(oh);
1047 ret |= _init_clkdm(oh);
1050 oh->_state = _HWMOD_STATE_CLKS_INITED;
1052 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1058 * _wait_target_ready - wait for a module to leave slave idle
1059 * @oh: struct omap_hwmod *
1061 * Wait for a module @oh to leave slave idle. Returns 0 if the module
1062 * does not have an IDLEST bit or if the module successfully leaves
1063 * slave idle; otherwise, pass along the return value of the
1064 * appropriate *_cm*_wait_module_ready() function.
1066 static int _wait_target_ready(struct omap_hwmod *oh)
1068 struct omap_hwmod_ocp_if *os;
1074 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1077 os = oh->slaves[oh->_mpu_port_index];
1079 if (oh->flags & HWMOD_NO_IDLEST)
1082 /* XXX check module SIDLEMODE */
1084 /* XXX check clock enable states */
1086 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1087 ret = omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
1088 oh->prcm.omap2.idlest_reg_id,
1089 oh->prcm.omap2.idlest_idle_bit);
1090 } else if (cpu_is_omap44xx()) {
1094 ret = omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
1096 oh->clkdm->clkdm_offs,
1097 oh->prcm.omap4.clkctrl_offs);
1106 * _wait_target_disable - wait for a module to be disabled
1107 * @oh: struct omap_hwmod *
1109 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1110 * does not have an IDLEST bit or if the module successfully enters
1111 * slave idle; otherwise, pass along the return value of the
1112 * appropriate *_cm*_wait_module_idle() function.
1114 static int _wait_target_disable(struct omap_hwmod *oh)
1116 /* TODO: For now just handle OMAP4+ */
1117 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1123 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1126 if (oh->flags & HWMOD_NO_IDLEST)
1129 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
1131 oh->clkdm->clkdm_offs,
1132 oh->prcm.omap4.clkctrl_offs);
1136 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1137 * @oh: struct omap_hwmod *
1138 * @name: name of the reset line in the context of this hwmod
1139 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1141 * Return the bit position of the reset line that match the
1142 * input name. Return -ENOENT if not found.
1144 static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1145 struct omap_hwmod_rst_info *ohri)
1149 for (i = 0; i < oh->rst_lines_cnt; i++) {
1150 const char *rst_line = oh->rst_lines[i].name;
1151 if (!strcmp(rst_line, name)) {
1152 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1153 ohri->st_shift = oh->rst_lines[i].st_shift;
1154 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1155 oh->name, __func__, rst_line, ohri->rst_shift,
1166 * _assert_hardreset - assert the HW reset line of submodules
1167 * contained in the hwmod module.
1168 * @oh: struct omap_hwmod *
1169 * @name: name of the reset line to lookup and assert
1171 * Some IP like dsp, ipu or iva contain processor that require
1172 * an HW reset line to be assert / deassert in order to enable fully
1175 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1177 struct omap_hwmod_rst_info ohri;
1183 ret = _lookup_hardreset(oh, name, &ohri);
1184 if (IS_ERR_VALUE(ret))
1187 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1188 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
1190 else if (cpu_is_omap44xx())
1191 return omap4_prminst_assert_hardreset(ohri.rst_shift,
1192 oh->clkdm->pwrdm.ptr->prcm_partition,
1193 oh->clkdm->pwrdm.ptr->prcm_offs,
1194 oh->prcm.omap4.rstctrl_offs);
1200 * _deassert_hardreset - deassert the HW reset line of submodules contained
1201 * in the hwmod module.
1202 * @oh: struct omap_hwmod *
1203 * @name: name of the reset line to look up and deassert
1205 * Some IP like dsp, ipu or iva contain processor that require
1206 * an HW reset line to be assert / deassert in order to enable fully
1209 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1211 struct omap_hwmod_rst_info ohri;
1217 ret = _lookup_hardreset(oh, name, &ohri);
1218 if (IS_ERR_VALUE(ret))
1221 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1222 ret = omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
1225 } else if (cpu_is_omap44xx()) {
1227 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1229 ret = omap4_prminst_deassert_hardreset(ohri.rst_shift,
1230 oh->clkdm->pwrdm.ptr->prcm_partition,
1231 oh->clkdm->pwrdm.ptr->prcm_offs,
1232 oh->prcm.omap4.rstctrl_offs);
1238 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1244 * _read_hardreset - read the HW reset line state of submodules
1245 * contained in the hwmod module
1246 * @oh: struct omap_hwmod *
1247 * @name: name of the reset line to look up and read
1249 * Return the state of the reset line.
1251 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1253 struct omap_hwmod_rst_info ohri;
1259 ret = _lookup_hardreset(oh, name, &ohri);
1260 if (IS_ERR_VALUE(ret))
1263 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1264 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
1266 } else if (cpu_is_omap44xx()) {
1267 return omap4_prminst_is_hardreset_asserted(ohri.rst_shift,
1268 oh->clkdm->pwrdm.ptr->prcm_partition,
1269 oh->clkdm->pwrdm.ptr->prcm_offs,
1270 oh->prcm.omap4.rstctrl_offs);
1277 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1278 * @oh: struct omap_hwmod *
1280 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1281 * enabled for this to work. Returns -EINVAL if the hwmod cannot be
1282 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1283 * the module did not reset in time, or 0 upon success.
1285 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1286 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1287 * use the SYSCONFIG softreset bit to provide the status.
1289 * Note that some IP like McBSP do have reset control but don't have
1292 static int _ocp_softreset(struct omap_hwmod *oh)
1298 if (!oh->class->sysc ||
1299 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1302 /* clocks must be on for this operation */
1303 if (oh->_state != _HWMOD_STATE_ENABLED) {
1304 pr_warning("omap_hwmod: %s: reset can only be entered from "
1305 "enabled state\n", oh->name);
1309 /* For some modules, all optionnal clocks need to be enabled as well */
1310 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1311 _enable_optional_clocks(oh);
1313 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1315 v = oh->_sysc_cache;
1316 ret = _set_softreset(oh, &v);
1319 _write_sysconfig(v, oh);
1321 if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
1322 omap_test_timeout((omap_hwmod_read(oh,
1323 oh->class->sysc->syss_offs)
1324 & SYSS_RESETDONE_MASK),
1325 MAX_MODULE_SOFTRESET_WAIT, c);
1326 else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS)
1327 omap_test_timeout(!(omap_hwmod_read(oh,
1328 oh->class->sysc->sysc_offs)
1329 & SYSC_TYPE2_SOFTRESET_MASK),
1330 MAX_MODULE_SOFTRESET_WAIT, c);
1332 if (c == MAX_MODULE_SOFTRESET_WAIT)
1333 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1334 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1336 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1339 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1340 * _wait_target_ready() or _reset()
1343 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1346 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1347 _disable_optional_clocks(oh);
1353 * _reset - reset an omap_hwmod
1354 * @oh: struct omap_hwmod *
1356 * Resets an omap_hwmod @oh. The default software reset mechanism for
1357 * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
1358 * bit. However, some hwmods cannot be reset via this method: some
1359 * are not targets and therefore have no OCP header registers to
1360 * access; others (like the IVA) have idiosyncratic reset sequences.
1361 * So for these relatively rare cases, custom reset code can be
1362 * supplied in the struct omap_hwmod_class .reset function pointer.
1363 * Passes along the return value from either _reset() or the custom
1364 * reset function - these must return -EINVAL if the hwmod cannot be
1365 * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
1366 * the module did not reset in time, or 0 upon success.
1368 static int _reset(struct omap_hwmod *oh)
1372 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1374 ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
1380 * _enable - enable an omap_hwmod
1381 * @oh: struct omap_hwmod *
1383 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1384 * register target. Returns -EINVAL if the hwmod is in the wrong
1385 * state or passes along the return value of _wait_target_ready().
1387 static int _enable(struct omap_hwmod *oh)
1391 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1393 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1394 oh->_state != _HWMOD_STATE_IDLE &&
1395 oh->_state != _HWMOD_STATE_DISABLED) {
1396 WARN(1, "omap_hwmod: %s: enabled state can only be entered "
1397 "from initialized, idle, or disabled state\n", oh->name);
1401 /* Mux pins for device runtime if populated */
1402 if (oh->mux && (!oh->mux->enabled ||
1403 ((oh->_state == _HWMOD_STATE_IDLE) &&
1404 oh->mux->pads_dynamic)))
1405 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
1407 _add_initiator_dep(oh, mpu_oh);
1411 * If an IP contains only one HW reset line, then de-assert it in order
1412 * to allow the module state transition. Otherwise the PRCM will return
1413 * Intransition status, and the init will failed.
1415 if ((oh->_state == _HWMOD_STATE_INITIALIZED ||
1416 oh->_state == _HWMOD_STATE_DISABLED) && oh->rst_lines_cnt == 1)
1417 _deassert_hardreset(oh, oh->rst_lines[0].name);
1419 r = _wait_target_ready(oh);
1421 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1423 _disable_clocks(oh);
1428 oh->_state = _HWMOD_STATE_ENABLED;
1430 /* Access the sysconfig only if the target is ready */
1431 if (oh->class->sysc) {
1432 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1433 _update_sysc_cache(oh);
1441 * _idle - idle an omap_hwmod
1442 * @oh: struct omap_hwmod *
1444 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1445 * no further work. Returns -EINVAL if the hwmod is in the wrong
1446 * state or returns 0.
1448 static int _idle(struct omap_hwmod *oh)
1452 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1454 if (oh->_state != _HWMOD_STATE_ENABLED) {
1455 WARN(1, "omap_hwmod: %s: idle state can only be entered from "
1456 "enabled state\n", oh->name);
1460 if (oh->class->sysc)
1462 _del_initiator_dep(oh, mpu_oh);
1463 _disable_clocks(oh);
1464 ret = _wait_target_disable(oh);
1466 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1469 /* Mux pins for device idle if populated */
1470 if (oh->mux && oh->mux->pads_dynamic)
1471 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
1473 oh->_state = _HWMOD_STATE_IDLE;
1479 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1480 * @oh: struct omap_hwmod *
1481 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1483 * Sets the IP block's OCP autoidle bit in hardware, and updates our
1484 * local copy. Intended to be used by drivers that require
1485 * direct manipulation of the AUTOIDLE bits.
1486 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1487 * along the return value from _set_module_autoidle().
1489 * Any users of this function should be scrutinized carefully.
1491 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
1495 unsigned long flags;
1497 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
1500 spin_lock_irqsave(&oh->_lock, flags);
1502 v = oh->_sysc_cache;
1504 retval = _set_module_autoidle(oh, autoidle, &v);
1507 _write_sysconfig(v, oh);
1509 spin_unlock_irqrestore(&oh->_lock, flags);
1515 * _shutdown - shutdown an omap_hwmod
1516 * @oh: struct omap_hwmod *
1518 * Shut down an omap_hwmod @oh. This should be called when the driver
1519 * used for the hwmod is removed or unloaded or if the driver is not
1520 * used by the system. Returns -EINVAL if the hwmod is in the wrong
1521 * state or returns 0.
1523 static int _shutdown(struct omap_hwmod *oh)
1528 if (oh->_state != _HWMOD_STATE_IDLE &&
1529 oh->_state != _HWMOD_STATE_ENABLED) {
1530 WARN(1, "omap_hwmod: %s: disabled state can only be entered "
1531 "from idle, or enabled state\n", oh->name);
1535 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
1537 if (oh->class->pre_shutdown) {
1538 prev_state = oh->_state;
1539 if (oh->_state == _HWMOD_STATE_IDLE)
1541 ret = oh->class->pre_shutdown(oh);
1543 if (prev_state == _HWMOD_STATE_IDLE)
1549 if (oh->class->sysc) {
1550 if (oh->_state == _HWMOD_STATE_IDLE)
1555 /* clocks and deps are already disabled in idle */
1556 if (oh->_state == _HWMOD_STATE_ENABLED) {
1557 _del_initiator_dep(oh, mpu_oh);
1558 /* XXX what about the other system initiators here? dma, dsp */
1559 _disable_clocks(oh);
1560 ret = _wait_target_disable(oh);
1562 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1565 /* XXX Should this code also force-disable the optional clocks? */
1568 * If an IP contains only one HW reset line, then assert it
1569 * after disabling the clocks and before shutting down the IP.
1571 if (oh->rst_lines_cnt == 1)
1572 _assert_hardreset(oh, oh->rst_lines[0].name);
1574 /* Mux pins to safe mode or use populated off mode values */
1576 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
1578 oh->_state = _HWMOD_STATE_DISABLED;
1584 * _setup - do initial configuration of omap_hwmod
1585 * @oh: struct omap_hwmod *
1587 * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh
1588 * OCP_SYSCONFIG register. Returns 0.
1590 static int _setup(struct omap_hwmod *oh, void *data)
1595 if (oh->_state != _HWMOD_STATE_CLKS_INITED)
1598 /* Set iclk autoidle mode */
1599 if (oh->slaves_cnt > 0) {
1600 for (i = 0; i < oh->slaves_cnt; i++) {
1601 struct omap_hwmod_ocp_if *os = oh->slaves[i];
1602 struct clk *c = os->_clk;
1607 if (os->flags & OCPIF_SWSUP_IDLE) {
1608 /* XXX omap_iclk_deny_idle(c); */
1610 /* XXX omap_iclk_allow_idle(c); */
1616 oh->_state = _HWMOD_STATE_INITIALIZED;
1619 * In the case of hwmod with hardreset that should not be
1620 * de-assert at boot time, we have to keep the module
1621 * initialized, because we cannot enable it properly with the
1622 * reset asserted. Exit without warning because that behavior is
1625 if ((oh->flags & HWMOD_INIT_NO_RESET) && oh->rst_lines_cnt == 1)
1630 pr_warning("omap_hwmod: %s: cannot be enabled (%d)\n",
1631 oh->name, oh->_state);
1635 if (!(oh->flags & HWMOD_INIT_NO_RESET)) {
1639 * OCP_SYSCONFIG bits need to be reprogrammed after a softreset.
1640 * The _enable() function should be split to
1641 * avoid the rewrite of the OCP_SYSCONFIG register.
1643 if (oh->class->sysc) {
1644 _update_sysc_cache(oh);
1649 postsetup_state = oh->_postsetup_state;
1650 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
1651 postsetup_state = _HWMOD_STATE_ENABLED;
1654 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
1655 * it should be set by the core code as a runtime flag during startup
1657 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
1658 (postsetup_state == _HWMOD_STATE_IDLE))
1659 postsetup_state = _HWMOD_STATE_ENABLED;
1661 if (postsetup_state == _HWMOD_STATE_IDLE)
1663 else if (postsetup_state == _HWMOD_STATE_DISABLED)
1665 else if (postsetup_state != _HWMOD_STATE_ENABLED)
1666 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
1667 oh->name, postsetup_state);
1673 * _register - register a struct omap_hwmod
1674 * @oh: struct omap_hwmod *
1676 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
1677 * already has been registered by the same name; -EINVAL if the
1678 * omap_hwmod is in the wrong state, if @oh is NULL, if the
1679 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
1680 * name, or if the omap_hwmod's class is missing a name; or 0 upon
1683 * XXX The data should be copied into bootmem, so the original data
1684 * should be marked __initdata and freed after init. This would allow
1685 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
1686 * that the copy process would be relatively complex due to the large number
1689 static int __init _register(struct omap_hwmod *oh)
1693 if (!oh || !oh->name || !oh->class || !oh->class->name ||
1694 (oh->_state != _HWMOD_STATE_UNKNOWN))
1697 pr_debug("omap_hwmod: %s: registering\n", oh->name);
1699 if (_lookup(oh->name))
1702 ms_id = _find_mpu_port_index(oh);
1703 if (!IS_ERR_VALUE(ms_id))
1704 oh->_mpu_port_index = ms_id;
1706 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1708 list_add_tail(&oh->node, &omap_hwmod_list);
1710 spin_lock_init(&oh->_lock);
1712 oh->_state = _HWMOD_STATE_REGISTERED;
1715 * XXX Rather than doing a strcmp(), this should test a flag
1716 * set in the hwmod data, inserted by the autogenerator code.
1718 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
1725 /* Public functions */
1727 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
1729 if (oh->flags & HWMOD_16BIT_REG)
1730 return __raw_readw(oh->_mpu_rt_va + reg_offs);
1732 return __raw_readl(oh->_mpu_rt_va + reg_offs);
1735 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
1737 if (oh->flags & HWMOD_16BIT_REG)
1738 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
1740 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
1744 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
1745 * @oh: struct omap_hwmod *
1747 * This is a public function exposed to drivers. Some drivers may need to do
1748 * some settings before and after resetting the device. Those drivers after
1749 * doing the necessary settings could use this function to start a reset by
1750 * setting the SYSCONFIG.SOFTRESET bit.
1752 int omap_hwmod_softreset(struct omap_hwmod *oh)
1757 if (!oh || !(oh->_sysc_cache))
1760 v = oh->_sysc_cache;
1761 ret = _set_softreset(oh, &v);
1764 _write_sysconfig(v, oh);
1771 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
1772 * @oh: struct omap_hwmod *
1773 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
1775 * Sets the IP block's OCP slave idlemode in hardware, and updates our
1776 * local copy. Intended to be used by drivers that have some erratum
1777 * that requires direct manipulation of the SIDLEMODE bits. Returns
1778 * -EINVAL if @oh is null, or passes along the return value from
1779 * _set_slave_idlemode().
1781 * XXX Does this function have any current users? If not, we should
1782 * remove it; it is better to let the rest of the hwmod code handle this.
1783 * Any users of this function should be scrutinized carefully.
1785 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
1793 v = oh->_sysc_cache;
1795 retval = _set_slave_idlemode(oh, idlemode, &v);
1797 _write_sysconfig(v, oh);
1803 * omap_hwmod_lookup - look up a registered omap_hwmod by name
1804 * @name: name of the omap_hwmod to look up
1806 * Given a @name of an omap_hwmod, return a pointer to the registered
1807 * struct omap_hwmod *, or NULL upon error.
1809 struct omap_hwmod *omap_hwmod_lookup(const char *name)
1811 struct omap_hwmod *oh;
1822 * omap_hwmod_for_each - call function for each registered omap_hwmod
1823 * @fn: pointer to a callback function
1824 * @data: void * data to pass to callback function
1826 * Call @fn for each registered omap_hwmod, passing @data to each
1827 * function. @fn must return 0 for success or any other value for
1828 * failure. If @fn returns non-zero, the iteration across omap_hwmods
1829 * will stop and the non-zero return value will be passed to the
1830 * caller of omap_hwmod_for_each(). @fn is called with
1831 * omap_hwmod_for_each() held.
1833 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
1836 struct omap_hwmod *temp_oh;
1842 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1843 ret = (*fn)(temp_oh, data);
1852 * omap_hwmod_register - register an array of hwmods
1853 * @ohs: pointer to an array of omap_hwmods to register
1855 * Intended to be called early in boot before the clock framework is
1856 * initialized. If @ohs is not null, will register all omap_hwmods
1857 * listed in @ohs that are valid for this chip. Returns 0.
1859 int __init omap_hwmod_register(struct omap_hwmod **ohs)
1868 if (!omap_chip_is(ohs[i]->omap_chip))
1871 r = _register(ohs[i]);
1872 WARN(r, "omap_hwmod: %s: _register returned %d\n", ohs[i]->name,
1880 * _populate_mpu_rt_base - populate the virtual address for a hwmod
1882 * Must be called only from omap_hwmod_setup_*() so ioremap works properly.
1883 * Assumes the caller takes care of locking if needed.
1885 static int __init _populate_mpu_rt_base(struct omap_hwmod *oh, void *data)
1887 if (oh->_state != _HWMOD_STATE_REGISTERED)
1890 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1893 oh->_mpu_rt_va = _find_mpu_rt_base(oh, oh->_mpu_port_index);
1899 * omap_hwmod_setup_one - set up a single hwmod
1900 * @oh_name: const char * name of the already-registered hwmod to set up
1902 * Must be called after omap2_clk_init(). Resolves the struct clk
1903 * names to struct clk pointers for each registered omap_hwmod. Also
1904 * calls _setup() on each hwmod. Returns -EINVAL upon error or 0 upon
1907 int __init omap_hwmod_setup_one(const char *oh_name)
1909 struct omap_hwmod *oh;
1912 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
1915 pr_err("omap_hwmod: %s: cannot setup_one: MPU initiator hwmod %s not yet registered\n",
1916 oh_name, MPU_INITIATOR_NAME);
1920 oh = _lookup(oh_name);
1922 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
1926 if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
1927 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
1929 r = _populate_mpu_rt_base(oh, NULL);
1930 if (IS_ERR_VALUE(r)) {
1931 WARN(1, "omap_hwmod: %s: couldn't set mpu_rt_base\n", oh_name);
1935 r = _init_clocks(oh, NULL);
1936 if (IS_ERR_VALUE(r)) {
1937 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh_name);
1947 * omap_hwmod_setup - do some post-clock framework initialization
1949 * Must be called after omap2_clk_init(). Resolves the struct clk names
1950 * to struct clk pointers for each registered omap_hwmod. Also calls
1951 * _setup() on each hwmod. Returns 0 upon success.
1953 static int __init omap_hwmod_setup_all(void)
1958 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
1959 __func__, MPU_INITIATOR_NAME);
1963 r = omap_hwmod_for_each(_populate_mpu_rt_base, NULL);
1965 r = omap_hwmod_for_each(_init_clocks, NULL);
1966 WARN(IS_ERR_VALUE(r),
1967 "omap_hwmod: %s: _init_clocks failed\n", __func__);
1969 omap_hwmod_for_each(_setup, NULL);
1973 core_initcall(omap_hwmod_setup_all);
1976 * omap_hwmod_enable - enable an omap_hwmod
1977 * @oh: struct omap_hwmod *
1979 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
1980 * Returns -EINVAL on error or passes along the return value from _enable().
1982 int omap_hwmod_enable(struct omap_hwmod *oh)
1985 unsigned long flags;
1990 spin_lock_irqsave(&oh->_lock, flags);
1992 spin_unlock_irqrestore(&oh->_lock, flags);
1998 * omap_hwmod_idle - idle an omap_hwmod
1999 * @oh: struct omap_hwmod *
2001 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
2002 * Returns -EINVAL on error or passes along the return value from _idle().
2004 int omap_hwmod_idle(struct omap_hwmod *oh)
2006 unsigned long flags;
2011 spin_lock_irqsave(&oh->_lock, flags);
2013 spin_unlock_irqrestore(&oh->_lock, flags);
2019 * omap_hwmod_shutdown - shutdown an omap_hwmod
2020 * @oh: struct omap_hwmod *
2022 * Shutdown an omap_hwmod @oh. Intended to be called by
2023 * omap_device_shutdown(). Returns -EINVAL on error or passes along
2024 * the return value from _shutdown().
2026 int omap_hwmod_shutdown(struct omap_hwmod *oh)
2028 unsigned long flags;
2033 spin_lock_irqsave(&oh->_lock, flags);
2035 spin_unlock_irqrestore(&oh->_lock, flags);
2041 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
2042 * @oh: struct omap_hwmod *oh
2044 * Intended to be called by the omap_device code.
2046 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
2048 unsigned long flags;
2050 spin_lock_irqsave(&oh->_lock, flags);
2052 spin_unlock_irqrestore(&oh->_lock, flags);
2058 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
2059 * @oh: struct omap_hwmod *oh
2061 * Intended to be called by the omap_device code.
2063 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
2065 unsigned long flags;
2067 spin_lock_irqsave(&oh->_lock, flags);
2068 _disable_clocks(oh);
2069 spin_unlock_irqrestore(&oh->_lock, flags);
2075 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
2076 * @oh: struct omap_hwmod *oh
2078 * Intended to be called by drivers and core code when all posted
2079 * writes to a device must complete before continuing further
2080 * execution (for example, after clearing some device IRQSTATUS
2083 * XXX what about targets with multiple OCP threads?
2085 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
2089 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
2090 WARN(1, "omap_device: %s: OCP barrier impossible due to "
2091 "device configuration\n", oh->name);
2096 * Forces posted writes to complete on the OCP thread handling
2099 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
2103 * omap_hwmod_reset - reset the hwmod
2104 * @oh: struct omap_hwmod *
2106 * Under some conditions, a driver may wish to reset the entire device.
2107 * Called from omap_device code. Returns -EINVAL on error or passes along
2108 * the return value from _reset().
2110 int omap_hwmod_reset(struct omap_hwmod *oh)
2113 unsigned long flags;
2118 spin_lock_irqsave(&oh->_lock, flags);
2120 spin_unlock_irqrestore(&oh->_lock, flags);
2126 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
2127 * @oh: struct omap_hwmod *
2128 * @res: pointer to the first element of an array of struct resource to fill
2130 * Count the number of struct resource array elements necessary to
2131 * contain omap_hwmod @oh resources. Intended to be called by code
2132 * that registers omap_devices. Intended to be used to determine the
2133 * size of a dynamically-allocated struct resource array, before
2134 * calling omap_hwmod_fill_resources(). Returns the number of struct
2135 * resource array elements needed.
2137 * XXX This code is not optimized. It could attempt to merge adjacent
2141 int omap_hwmod_count_resources(struct omap_hwmod *oh)
2145 ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
2147 for (i = 0; i < oh->slaves_cnt; i++)
2148 ret += _count_ocp_if_addr_spaces(oh->slaves[i]);
2154 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
2155 * @oh: struct omap_hwmod *
2156 * @res: pointer to the first element of an array of struct resource to fill
2158 * Fill the struct resource array @res with resource data from the
2159 * omap_hwmod @oh. Intended to be called by code that registers
2160 * omap_devices. See also omap_hwmod_count_resources(). Returns the
2161 * number of array elements filled.
2163 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
2165 int i, j, mpu_irqs_cnt, sdma_reqs_cnt;
2168 /* For each IRQ, DMA, memory area, fill in array.*/
2170 mpu_irqs_cnt = _count_mpu_irqs(oh);
2171 for (i = 0; i < mpu_irqs_cnt; i++) {
2172 (res + r)->name = (oh->mpu_irqs + i)->name;
2173 (res + r)->start = (oh->mpu_irqs + i)->irq;
2174 (res + r)->end = (oh->mpu_irqs + i)->irq;
2175 (res + r)->flags = IORESOURCE_IRQ;
2179 sdma_reqs_cnt = _count_sdma_reqs(oh);
2180 for (i = 0; i < sdma_reqs_cnt; i++) {
2181 (res + r)->name = (oh->sdma_reqs + i)->name;
2182 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
2183 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
2184 (res + r)->flags = IORESOURCE_DMA;
2188 for (i = 0; i < oh->slaves_cnt; i++) {
2189 struct omap_hwmod_ocp_if *os;
2193 addr_cnt = _count_ocp_if_addr_spaces(os);
2195 for (j = 0; j < addr_cnt; j++) {
2196 (res + r)->name = (os->addr + j)->name;
2197 (res + r)->start = (os->addr + j)->pa_start;
2198 (res + r)->end = (os->addr + j)->pa_end;
2199 (res + r)->flags = IORESOURCE_MEM;
2208 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2209 * @oh: struct omap_hwmod *
2211 * Return the powerdomain pointer associated with the OMAP module
2212 * @oh's main clock. If @oh does not have a main clk, return the
2213 * powerdomain associated with the interface clock associated with the
2214 * module's MPU port. (XXX Perhaps this should use the SDMA port
2215 * instead?) Returns NULL on error, or a struct powerdomain * on
2218 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
2228 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2230 c = oh->slaves[oh->_mpu_port_index]->_clk;
2236 return c->clkdm->pwrdm.ptr;
2241 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
2242 * @oh: struct omap_hwmod *
2244 * Returns the virtual address corresponding to the beginning of the
2245 * module's register target, in the address range that is intended to
2246 * be used by the MPU. Returns the virtual address upon success or NULL
2249 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
2254 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2257 if (oh->_state == _HWMOD_STATE_UNKNOWN)
2260 return oh->_mpu_rt_va;
2264 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
2265 * @oh: struct omap_hwmod *
2266 * @init_oh: struct omap_hwmod * (initiator)
2268 * Add a sleep dependency between the initiator @init_oh and @oh.
2269 * Intended to be called by DSP/Bridge code via platform_data for the
2270 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2271 * code needs to add/del initiator dependencies dynamically
2272 * before/after accessing a device. Returns the return value from
2273 * _add_initiator_dep().
2275 * XXX Keep a usecount in the clockdomain code
2277 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
2278 struct omap_hwmod *init_oh)
2280 return _add_initiator_dep(oh, init_oh);
2284 * XXX what about functions for drivers to save/restore ocp_sysconfig
2285 * for context save/restore operations?
2289 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
2290 * @oh: struct omap_hwmod *
2291 * @init_oh: struct omap_hwmod * (initiator)
2293 * Remove a sleep dependency between the initiator @init_oh and @oh.
2294 * Intended to be called by DSP/Bridge code via platform_data for the
2295 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
2296 * code needs to add/del initiator dependencies dynamically
2297 * before/after accessing a device. Returns the return value from
2298 * _del_initiator_dep().
2300 * XXX Keep a usecount in the clockdomain code
2302 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
2303 struct omap_hwmod *init_oh)
2305 return _del_initiator_dep(oh, init_oh);
2309 * omap_hwmod_enable_wakeup - allow device to wake up the system
2310 * @oh: struct omap_hwmod *
2312 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
2313 * send wakeups to the PRCM. Eventually this should sets PRCM wakeup
2314 * registers to cause the PRCM to receive wakeup events from the
2315 * module. Does not set any wakeup routing registers beyond this
2316 * point - if the module is to wake up any other module or subsystem,
2317 * that must be set separately. Called by omap_device code. Returns
2318 * -EINVAL on error or 0 upon success.
2320 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
2322 unsigned long flags;
2325 if (!oh->class->sysc ||
2326 !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2329 spin_lock_irqsave(&oh->_lock, flags);
2330 v = oh->_sysc_cache;
2331 _enable_wakeup(oh, &v);
2332 _write_sysconfig(v, oh);
2333 spin_unlock_irqrestore(&oh->_lock, flags);
2339 * omap_hwmod_disable_wakeup - prevent device from waking the system
2340 * @oh: struct omap_hwmod *
2342 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
2343 * from sending wakeups to the PRCM. Eventually this should clear
2344 * PRCM wakeup registers to cause the PRCM to ignore wakeup events
2345 * from the module. Does not set any wakeup routing registers beyond
2346 * this point - if the module is to wake up any other module or
2347 * subsystem, that must be set separately. Called by omap_device
2348 * code. Returns -EINVAL on error or 0 upon success.
2350 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
2352 unsigned long flags;
2355 if (!oh->class->sysc ||
2356 !(oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP))
2359 spin_lock_irqsave(&oh->_lock, flags);
2360 v = oh->_sysc_cache;
2361 _disable_wakeup(oh, &v);
2362 _write_sysconfig(v, oh);
2363 spin_unlock_irqrestore(&oh->_lock, flags);
2369 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
2370 * contained in the hwmod module.
2371 * @oh: struct omap_hwmod *
2372 * @name: name of the reset line to lookup and assert
2374 * Some IP like dsp, ipu or iva contain processor that require
2375 * an HW reset line to be assert / deassert in order to enable fully
2376 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2377 * yet supported on this OMAP; otherwise, passes along the return value
2378 * from _assert_hardreset().
2380 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
2383 unsigned long flags;
2388 spin_lock_irqsave(&oh->_lock, flags);
2389 ret = _assert_hardreset(oh, name);
2390 spin_unlock_irqrestore(&oh->_lock, flags);
2396 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
2397 * contained in the hwmod module.
2398 * @oh: struct omap_hwmod *
2399 * @name: name of the reset line to look up and deassert
2401 * Some IP like dsp, ipu or iva contain processor that require
2402 * an HW reset line to be assert / deassert in order to enable fully
2403 * the IP. Returns -EINVAL if @oh is null or if the operation is not
2404 * yet supported on this OMAP; otherwise, passes along the return value
2405 * from _deassert_hardreset().
2407 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
2410 unsigned long flags;
2415 spin_lock_irqsave(&oh->_lock, flags);
2416 ret = _deassert_hardreset(oh, name);
2417 spin_unlock_irqrestore(&oh->_lock, flags);
2423 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
2424 * contained in the hwmod module
2425 * @oh: struct omap_hwmod *
2426 * @name: name of the reset line to look up and read
2428 * Return the current state of the hwmod @oh's reset line named @name:
2429 * returns -EINVAL upon parameter error or if this operation
2430 * is unsupported on the current OMAP; otherwise, passes along the return
2431 * value from _read_hardreset().
2433 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
2436 unsigned long flags;
2441 spin_lock_irqsave(&oh->_lock, flags);
2442 ret = _read_hardreset(oh, name);
2443 spin_unlock_irqrestore(&oh->_lock, flags);
2450 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
2451 * @classname: struct omap_hwmod_class name to search for
2452 * @fn: callback function pointer to call for each hwmod in class @classname
2453 * @user: arbitrary context data to pass to the callback function
2455 * For each omap_hwmod of class @classname, call @fn.
2456 * If the callback function returns something other than
2457 * zero, the iterator is terminated, and the callback function's return
2458 * value is passed back to the caller. Returns 0 upon success, -EINVAL
2459 * if @classname or @fn are NULL, or passes back the error code from @fn.
2461 int omap_hwmod_for_each_by_class(const char *classname,
2462 int (*fn)(struct omap_hwmod *oh,
2466 struct omap_hwmod *temp_oh;
2469 if (!classname || !fn)
2472 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
2473 __func__, classname);
2475 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
2476 if (!strcmp(temp_oh->class->name, classname)) {
2477 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
2478 __func__, temp_oh->name);
2479 ret = (*fn)(temp_oh, user);
2486 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
2493 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
2494 * @oh: struct omap_hwmod *
2495 * @state: state that _setup() should leave the hwmod in
2497 * Sets the hwmod state that @oh will enter at the end of _setup()
2498 * (called by omap_hwmod_setup_*()). Only valid to call between
2499 * calling omap_hwmod_register() and omap_hwmod_setup_*(). Returns
2500 * 0 upon success or -EINVAL if there is a problem with the arguments
2501 * or if the hwmod is in the wrong state.
2503 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
2506 unsigned long flags;
2511 if (state != _HWMOD_STATE_DISABLED &&
2512 state != _HWMOD_STATE_ENABLED &&
2513 state != _HWMOD_STATE_IDLE)
2516 spin_lock_irqsave(&oh->_lock, flags);
2518 if (oh->_state != _HWMOD_STATE_REGISTERED) {
2523 oh->_postsetup_state = state;
2527 spin_unlock_irqrestore(&oh->_lock, flags);
2533 * omap_hwmod_get_context_loss_count - get lost context count
2534 * @oh: struct omap_hwmod *
2536 * Query the powerdomain of of @oh to get the context loss
2537 * count for this device.
2539 * Returns the context loss count of the powerdomain assocated with @oh
2540 * upon success, or zero if no powerdomain exists for @oh.
2542 u32 omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
2544 struct powerdomain *pwrdm;
2547 pwrdm = omap_hwmod_get_pwrdm(oh);
2549 ret = pwrdm_get_context_loss_count(pwrdm);
2555 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
2556 * @oh: struct omap_hwmod *
2558 * Prevent the hwmod @oh from being reset during the setup process.
2559 * Intended for use by board-*.c files on boards with devices that
2560 * cannot tolerate being reset. Must be called before the hwmod has
2561 * been set up. Returns 0 upon success or negative error code upon
2564 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
2569 if (oh->_state != _HWMOD_STATE_REGISTERED) {
2570 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
2575 oh->flags |= HWMOD_INIT_NO_RESET;