2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 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 * | ({read,write}l_relaxed, 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-provider.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>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
141 #include <linux/cpu.h>
142 #include <linux/of.h>
143 #include <linux/of_address.h>
145 #include <asm/system_misc.h>
148 #include "omap_hwmod.h"
152 #include "clockdomain.h"
153 #include "powerdomain.h"
161 #include "prminst44xx.h"
165 /* Name of the OMAP hwmod for the MPU */
166 #define MPU_INITIATOR_NAME "mpu"
169 * Number of struct omap_hwmod_link records per struct
170 * omap_hwmod_ocp_if record (master->slave and slave->master)
172 #define LINKS_PER_OCP_IF 2
175 * Address offset (in bytes) between the reset control and the reset
176 * status registers: 4 bytes on OMAP4
178 #define OMAP4_RST_CTRL_ST_OFFSET 4
181 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
182 * @enable_module: function to enable a module (via MODULEMODE)
183 * @disable_module: function to disable a module (via MODULEMODE)
185 * XXX Eventually this functionality will be hidden inside the PRM/CM
186 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
187 * conditionals in this code.
189 struct omap_hwmod_soc_ops {
190 void (*enable_module)(struct omap_hwmod *oh);
191 int (*disable_module)(struct omap_hwmod *oh);
192 int (*wait_target_ready)(struct omap_hwmod *oh);
193 int (*assert_hardreset)(struct omap_hwmod *oh,
194 struct omap_hwmod_rst_info *ohri);
195 int (*deassert_hardreset)(struct omap_hwmod *oh,
196 struct omap_hwmod_rst_info *ohri);
197 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
198 struct omap_hwmod_rst_info *ohri);
199 int (*init_clkdm)(struct omap_hwmod *oh);
200 void (*update_context_lost)(struct omap_hwmod *oh);
201 int (*get_context_lost)(struct omap_hwmod *oh);
204 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
205 static struct omap_hwmod_soc_ops soc_ops;
207 /* omap_hwmod_list contains all registered struct omap_hwmods */
208 static LIST_HEAD(omap_hwmod_list);
210 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
211 static struct omap_hwmod *mpu_oh;
213 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
214 static DEFINE_SPINLOCK(io_chain_lock);
217 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
218 * allocated from - used to reduce the number of small memory
219 * allocations, which has a significant impact on performance
221 static struct omap_hwmod_link *linkspace;
224 * free_ls, max_ls: array indexes into linkspace; representing the
225 * next free struct omap_hwmod_link index, and the maximum number of
226 * struct omap_hwmod_link records allocated (respectively)
228 static unsigned short free_ls, max_ls, ls_supp;
230 /* inited: set to true once the hwmod code is initialized */
233 /* Private functions */
236 * _fetch_next_ocp_if - return the next OCP interface in a list
237 * @p: ptr to a ptr to the list_head inside the ocp_if to return
238 * @i: pointer to the index of the element pointed to by @p in the list
240 * Return a pointer to the struct omap_hwmod_ocp_if record
241 * containing the struct list_head pointed to by @p, and increment
242 * @p such that a future call to this routine will return the next
245 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
248 struct omap_hwmod_ocp_if *oi;
250 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
259 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
260 * @oh: struct omap_hwmod *
262 * Load the current value of the hwmod OCP_SYSCONFIG register into the
263 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
264 * OCP_SYSCONFIG register or 0 upon success.
266 static int _update_sysc_cache(struct omap_hwmod *oh)
268 if (!oh->class->sysc) {
269 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
273 /* XXX ensure module interface clock is up */
275 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
277 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
278 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
284 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
285 * @v: OCP_SYSCONFIG value to write
286 * @oh: struct omap_hwmod *
288 * Write @v into the module class' OCP_SYSCONFIG register, if it has
289 * one. No return value.
291 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
293 if (!oh->class->sysc) {
294 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
298 /* XXX ensure module interface clock is up */
300 /* Module might have lost context, always update cache and register */
302 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
306 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
307 * @oh: struct omap_hwmod *
308 * @standbymode: MIDLEMODE field bits
309 * @v: pointer to register contents to modify
311 * Update the master standby mode bits in @v to be @standbymode for
312 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
313 * upon error or 0 upon success.
315 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
321 if (!oh->class->sysc ||
322 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
325 if (!oh->class->sysc->sysc_fields) {
326 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
330 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
331 mstandby_mask = (0x3 << mstandby_shift);
333 *v &= ~mstandby_mask;
334 *v |= __ffs(standbymode) << mstandby_shift;
340 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
341 * @oh: struct omap_hwmod *
342 * @idlemode: SIDLEMODE field bits
343 * @v: pointer to register contents to modify
345 * Update the slave idle mode bits in @v to be @idlemode for the @oh
346 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
349 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
354 if (!oh->class->sysc ||
355 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
358 if (!oh->class->sysc->sysc_fields) {
359 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
363 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
364 sidle_mask = (0x3 << sidle_shift);
367 *v |= __ffs(idlemode) << sidle_shift;
373 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
374 * @oh: struct omap_hwmod *
375 * @clockact: CLOCKACTIVITY field bits
376 * @v: pointer to register contents to modify
378 * Update the clockactivity mode bits in @v to be @clockact for the
379 * @oh hwmod. Used for additional powersaving on some modules. Does
380 * not write to the hardware. Returns -EINVAL upon error or 0 upon
383 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
388 if (!oh->class->sysc ||
389 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
392 if (!oh->class->sysc->sysc_fields) {
393 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
397 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
398 clkact_mask = (0x3 << clkact_shift);
401 *v |= clockact << clkact_shift;
407 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
408 * @oh: struct omap_hwmod *
409 * @v: pointer to register contents to modify
411 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
412 * error or 0 upon success.
414 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
418 if (!oh->class->sysc ||
419 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
422 if (!oh->class->sysc->sysc_fields) {
423 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
427 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
435 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
436 * @oh: struct omap_hwmod *
437 * @v: pointer to register contents to modify
439 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
440 * error or 0 upon success.
442 static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
446 if (!oh->class->sysc ||
447 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
450 if (!oh->class->sysc->sysc_fields) {
452 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
457 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
465 * _wait_softreset_complete - wait for an OCP softreset to complete
466 * @oh: struct omap_hwmod * to wait on
468 * Wait until the IP block represented by @oh reports that its OCP
469 * softreset is complete. This can be triggered by software (see
470 * _ocp_softreset()) or by hardware upon returning from off-mode (one
471 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
472 * microseconds. Returns the number of microseconds waited.
474 static int _wait_softreset_complete(struct omap_hwmod *oh)
476 struct omap_hwmod_class_sysconfig *sysc;
480 sysc = oh->class->sysc;
482 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
483 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
484 & SYSS_RESETDONE_MASK),
485 MAX_MODULE_SOFTRESET_WAIT, c);
486 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
487 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
488 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
490 MAX_MODULE_SOFTRESET_WAIT, c);
497 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
498 * @oh: struct omap_hwmod *
500 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
501 * of some modules. When the DMA must perform read/write accesses, the
502 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
503 * for power management, software must set the DMADISABLE bit back to 1.
505 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
506 * error or 0 upon success.
508 static int _set_dmadisable(struct omap_hwmod *oh)
513 if (!oh->class->sysc ||
514 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
517 if (!oh->class->sysc->sysc_fields) {
518 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
522 /* clocks must be on for this operation */
523 if (oh->_state != _HWMOD_STATE_ENABLED) {
524 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
528 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
532 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
533 v |= dmadisable_mask;
534 _write_sysconfig(v, oh);
540 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
541 * @oh: struct omap_hwmod *
542 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
543 * @v: pointer to register contents to modify
545 * Update the module autoidle bit in @v to be @autoidle for the @oh
546 * hwmod. The autoidle bit controls whether the module can gate
547 * internal clocks automatically when it isn't doing anything; the
548 * exact function of this bit varies on a per-module basis. This
549 * function does not write to the hardware. Returns -EINVAL upon
550 * error or 0 upon success.
552 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
558 if (!oh->class->sysc ||
559 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
562 if (!oh->class->sysc->sysc_fields) {
563 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
567 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
568 autoidle_mask = (0x1 << autoidle_shift);
570 *v &= ~autoidle_mask;
571 *v |= autoidle << autoidle_shift;
577 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
578 * @oh: struct omap_hwmod *
579 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
581 * Set or clear the I/O pad wakeup flag in the mux entries for the
582 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
583 * in memory. If the hwmod is currently idled, and the new idle
584 * values don't match the previous ones, this function will also
585 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
586 * currently idled, this function won't touch the hardware: the new
587 * mux settings are written to the SCM PADCTRL registers when the
588 * hwmod is idled. No return value.
590 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
592 struct omap_device_pad *pad;
597 if (!oh->mux || !oh->mux->enabled)
600 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
601 pad = oh->mux->pads_dynamic[j];
603 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
606 prev_idle = pad->idle;
609 pad->idle |= OMAP_WAKEUP_EN;
611 pad->idle &= ~OMAP_WAKEUP_EN;
613 if (prev_idle != pad->idle)
617 if (change && oh->_state == _HWMOD_STATE_IDLE)
618 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
622 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
623 * @oh: struct omap_hwmod *
625 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
626 * upon error or 0 upon success.
628 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
630 if (!oh->class->sysc ||
631 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
632 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
633 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
636 if (!oh->class->sysc->sysc_fields) {
637 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
641 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
642 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
644 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
645 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
646 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
647 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
649 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
655 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
656 * @oh: struct omap_hwmod *
658 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
659 * upon error or 0 upon success.
661 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
663 if (!oh->class->sysc ||
664 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
665 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
666 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
669 if (!oh->class->sysc->sysc_fields) {
670 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
674 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
675 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
677 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
678 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
679 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
680 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
682 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
687 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
689 struct clk_hw_omap *clk;
693 } else if (oh->_clk) {
694 if (__clk_get_flags(oh->_clk) & CLK_IS_BASIC)
696 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
703 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
704 * @oh: struct omap_hwmod *
706 * Prevent the hardware module @oh from entering idle while the
707 * hardare module initiator @init_oh is active. Useful when a module
708 * will be accessed by a particular initiator (e.g., if a module will
709 * be accessed by the IVA, there should be a sleepdep between the IVA
710 * initiator and the module). Only applies to modules in smart-idle
711 * mode. If the clockdomain is marked as not needing autodeps, return
712 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
713 * passes along clkdm_add_sleepdep() value upon success.
715 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
717 struct clockdomain *clkdm, *init_clkdm;
719 clkdm = _get_clkdm(oh);
720 init_clkdm = _get_clkdm(init_oh);
722 if (!clkdm || !init_clkdm)
725 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
728 return clkdm_add_sleepdep(clkdm, init_clkdm);
732 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
733 * @oh: struct omap_hwmod *
735 * Allow the hardware module @oh to enter idle while the hardare
736 * module initiator @init_oh is active. Useful when a module will not
737 * be accessed by a particular initiator (e.g., if a module will not
738 * be accessed by the IVA, there should be no sleepdep between the IVA
739 * initiator and the module). Only applies to modules in smart-idle
740 * mode. If the clockdomain is marked as not needing autodeps, return
741 * 0 without doing anything. Returns -EINVAL upon error or passes
742 * along clkdm_del_sleepdep() value upon success.
744 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
746 struct clockdomain *clkdm, *init_clkdm;
748 clkdm = _get_clkdm(oh);
749 init_clkdm = _get_clkdm(init_oh);
751 if (!clkdm || !init_clkdm)
754 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
757 return clkdm_del_sleepdep(clkdm, init_clkdm);
761 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
762 * @oh: struct omap_hwmod *
764 * Called from _init_clocks(). Populates the @oh _clk (main
765 * functional clock pointer) if a main_clk is present. Returns 0 on
766 * success or -EINVAL on error.
768 static int _init_main_clk(struct omap_hwmod *oh)
775 oh->_clk = clk_get(NULL, oh->main_clk);
776 if (IS_ERR(oh->_clk)) {
777 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
778 oh->name, oh->main_clk);
782 * HACK: This needs a re-visit once clk_prepare() is implemented
783 * to do something meaningful. Today its just a no-op.
784 * If clk_prepare() is used at some point to do things like
785 * voltage scaling etc, then this would have to be moved to
786 * some point where subsystems like i2c and pmic become
789 clk_prepare(oh->_clk);
792 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
793 oh->name, oh->main_clk);
799 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
800 * @oh: struct omap_hwmod *
802 * Called from _init_clocks(). Populates the @oh OCP slave interface
803 * clock pointers. Returns 0 on success or -EINVAL on error.
805 static int _init_interface_clks(struct omap_hwmod *oh)
807 struct omap_hwmod_ocp_if *os;
813 p = oh->slave_ports.next;
815 while (i < oh->slaves_cnt) {
816 os = _fetch_next_ocp_if(&p, &i);
820 c = clk_get(NULL, os->clk);
822 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
829 * HACK: This needs a re-visit once clk_prepare() is implemented
830 * to do something meaningful. Today its just a no-op.
831 * If clk_prepare() is used at some point to do things like
832 * voltage scaling etc, then this would have to be moved to
833 * some point where subsystems like i2c and pmic become
836 clk_prepare(os->_clk);
843 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
844 * @oh: struct omap_hwmod *
846 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
847 * clock pointers. Returns 0 on success or -EINVAL on error.
849 static int _init_opt_clks(struct omap_hwmod *oh)
851 struct omap_hwmod_opt_clk *oc;
856 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
857 c = clk_get(NULL, oc->clk);
859 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
866 * HACK: This needs a re-visit once clk_prepare() is implemented
867 * to do something meaningful. Today its just a no-op.
868 * If clk_prepare() is used at some point to do things like
869 * voltage scaling etc, then this would have to be moved to
870 * some point where subsystems like i2c and pmic become
873 clk_prepare(oc->_clk);
880 * _enable_clocks - enable hwmod main clock and interface clocks
881 * @oh: struct omap_hwmod *
883 * Enables all clocks necessary for register reads and writes to succeed
884 * on the hwmod @oh. Returns 0.
886 static int _enable_clocks(struct omap_hwmod *oh)
888 struct omap_hwmod_ocp_if *os;
892 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
895 clk_enable(oh->_clk);
897 p = oh->slave_ports.next;
899 while (i < oh->slaves_cnt) {
900 os = _fetch_next_ocp_if(&p, &i);
902 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
903 clk_enable(os->_clk);
906 /* The opt clocks are controlled by the device driver. */
912 * _disable_clocks - disable hwmod main clock and interface clocks
913 * @oh: struct omap_hwmod *
915 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
917 static int _disable_clocks(struct omap_hwmod *oh)
919 struct omap_hwmod_ocp_if *os;
923 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
926 clk_disable(oh->_clk);
928 p = oh->slave_ports.next;
930 while (i < oh->slaves_cnt) {
931 os = _fetch_next_ocp_if(&p, &i);
933 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
934 clk_disable(os->_clk);
937 /* The opt clocks are controlled by the device driver. */
942 static void _enable_optional_clocks(struct omap_hwmod *oh)
944 struct omap_hwmod_opt_clk *oc;
947 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
949 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
951 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
952 __clk_get_name(oc->_clk));
953 clk_enable(oc->_clk);
957 static void _disable_optional_clocks(struct omap_hwmod *oh)
959 struct omap_hwmod_opt_clk *oc;
962 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
964 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
966 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
967 __clk_get_name(oc->_clk));
968 clk_disable(oc->_clk);
973 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
974 * @oh: struct omap_hwmod *
976 * Enables the PRCM module mode related to the hwmod @oh.
979 static void _omap4_enable_module(struct omap_hwmod *oh)
981 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
984 pr_debug("omap_hwmod: %s: %s: %d\n",
985 oh->name, __func__, oh->prcm.omap4.modulemode);
987 omap_cm_module_enable(oh->prcm.omap4.modulemode,
988 oh->clkdm->prcm_partition,
989 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
993 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
994 * @oh: struct omap_hwmod *
996 * Wait for a module @oh to enter slave idle. Returns 0 if the module
997 * does not have an IDLEST bit or if the module successfully enters
998 * slave idle; otherwise, pass along the return value of the
999 * appropriate *_cm*_wait_module_idle() function.
1001 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
1006 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1009 if (oh->flags & HWMOD_NO_IDLEST)
1012 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1014 oh->prcm.omap4.clkctrl_offs, 0);
1018 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1019 * @oh: struct omap_hwmod *oh
1021 * Count and return the number of MPU IRQs associated with the hwmod
1022 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1025 static int _count_mpu_irqs(struct omap_hwmod *oh)
1027 struct omap_hwmod_irq_info *ohii;
1030 if (!oh || !oh->mpu_irqs)
1034 ohii = &oh->mpu_irqs[i++];
1035 } while (ohii->irq != -1);
1041 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1042 * @oh: struct omap_hwmod *oh
1044 * Count and return the number of SDMA request lines associated with
1045 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1048 static int _count_sdma_reqs(struct omap_hwmod *oh)
1050 struct omap_hwmod_dma_info *ohdi;
1053 if (!oh || !oh->sdma_reqs)
1057 ohdi = &oh->sdma_reqs[i++];
1058 } while (ohdi->dma_req != -1);
1064 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1065 * @oh: struct omap_hwmod *oh
1067 * Count and return the number of address space ranges associated with
1068 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1071 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1073 struct omap_hwmod_addr_space *mem;
1076 if (!os || !os->addr)
1080 mem = &os->addr[i++];
1081 } while (mem->pa_start != mem->pa_end);
1087 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1088 * @oh: struct omap_hwmod * to operate on
1089 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1090 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1092 * Retrieve a MPU hardware IRQ line number named by @name associated
1093 * with the IP block pointed to by @oh. The IRQ number will be filled
1094 * into the address pointed to by @dma. When @name is non-null, the
1095 * IRQ line number associated with the named entry will be returned.
1096 * If @name is null, the first matching entry will be returned. Data
1097 * order is not meaningful in hwmod data, so callers are strongly
1098 * encouraged to use a non-null @name whenever possible to avoid
1099 * unpredictable effects if hwmod data is later added that causes data
1100 * ordering to change. Returns 0 upon success or a negative error
1103 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1113 while (oh->mpu_irqs[i].irq != -1) {
1114 if (name == oh->mpu_irqs[i].name ||
1115 !strcmp(name, oh->mpu_irqs[i].name)) {
1125 *irq = oh->mpu_irqs[i].irq;
1131 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1132 * @oh: struct omap_hwmod * to operate on
1133 * @name: pointer to the name of the SDMA request line to fetch (optional)
1134 * @dma: pointer to an unsigned int to store the request line ID to
1136 * Retrieve an SDMA request line ID named by @name on the IP block
1137 * pointed to by @oh. The ID will be filled into the address pointed
1138 * to by @dma. When @name is non-null, the request line ID associated
1139 * with the named entry will be returned. If @name is null, the first
1140 * matching entry will be returned. Data order is not meaningful in
1141 * hwmod data, so callers are strongly encouraged to use a non-null
1142 * @name whenever possible to avoid unpredictable effects if hwmod
1143 * data is later added that causes data ordering to change. Returns 0
1144 * upon success or a negative error code upon error.
1146 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1156 while (oh->sdma_reqs[i].dma_req != -1) {
1157 if (name == oh->sdma_reqs[i].name ||
1158 !strcmp(name, oh->sdma_reqs[i].name)) {
1168 *dma = oh->sdma_reqs[i].dma_req;
1174 * _get_addr_space_by_name - fetch address space start & end by name
1175 * @oh: struct omap_hwmod * to operate on
1176 * @name: pointer to the name of the address space to fetch (optional)
1177 * @pa_start: pointer to a u32 to store the starting address to
1178 * @pa_end: pointer to a u32 to store the ending address to
1180 * Retrieve address space start and end addresses for the IP block
1181 * pointed to by @oh. The data will be filled into the addresses
1182 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1183 * address space data associated with the named entry will be
1184 * returned. If @name is null, the first matching entry will be
1185 * returned. Data order is not meaningful in hwmod data, so callers
1186 * are strongly encouraged to use a non-null @name whenever possible
1187 * to avoid unpredictable effects if hwmod data is later added that
1188 * causes data ordering to change. Returns 0 upon success or a
1189 * negative error code upon error.
1191 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1192 u32 *pa_start, u32 *pa_end)
1195 struct omap_hwmod_ocp_if *os;
1196 struct list_head *p = NULL;
1199 p = oh->slave_ports.next;
1202 while (i < oh->slaves_cnt) {
1203 os = _fetch_next_ocp_if(&p, &i);
1209 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1210 if (name == os->addr[j].name ||
1211 !strcmp(name, os->addr[j].name)) {
1225 *pa_start = os->addr[j].pa_start;
1226 *pa_end = os->addr[j].pa_end;
1232 * _save_mpu_port_index - find and save the index to @oh's MPU port
1233 * @oh: struct omap_hwmod *
1235 * Determines the array index of the OCP slave port that the MPU uses
1236 * to address the device, and saves it into the struct omap_hwmod.
1237 * Intended to be called during hwmod registration only. No return
1240 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1242 struct omap_hwmod_ocp_if *os = NULL;
1243 struct list_head *p;
1249 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1251 p = oh->slave_ports.next;
1253 while (i < oh->slaves_cnt) {
1254 os = _fetch_next_ocp_if(&p, &i);
1255 if (os->user & OCP_USER_MPU) {
1257 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1266 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1267 * @oh: struct omap_hwmod *
1269 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1270 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1271 * communicate with the IP block. This interface need not be directly
1272 * connected to the MPU (and almost certainly is not), but is directly
1273 * connected to the IP block represented by @oh. Returns a pointer
1274 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1275 * error or if there does not appear to be a path from the MPU to this
1278 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1280 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1283 return oh->_mpu_port;
1287 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1288 * @oh: struct omap_hwmod *
1290 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1291 * the register target MPU address space; or returns NULL upon error.
1293 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1295 struct omap_hwmod_ocp_if *os;
1296 struct omap_hwmod_addr_space *mem;
1297 int found = 0, i = 0;
1299 os = _find_mpu_rt_port(oh);
1300 if (!os || !os->addr)
1304 mem = &os->addr[i++];
1305 if (mem->flags & ADDR_TYPE_RT)
1307 } while (!found && mem->pa_start != mem->pa_end);
1309 return (found) ? mem : NULL;
1313 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1314 * @oh: struct omap_hwmod *
1316 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1317 * by @oh is set to indicate to the PRCM that the IP block is active.
1318 * Usually this means placing the module into smart-idle mode and
1319 * smart-standby, but if there is a bug in the automatic idle handling
1320 * for the IP block, it may need to be placed into the force-idle or
1321 * no-idle variants of these modes. No return value.
1323 static void _enable_sysc(struct omap_hwmod *oh)
1328 struct clockdomain *clkdm;
1330 if (!oh->class->sysc)
1334 * Wait until reset has completed, this is needed as the IP
1335 * block is reset automatically by hardware in some cases
1336 * (off-mode for example), and the drivers require the
1337 * IP to be ready when they access it
1339 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1340 _enable_optional_clocks(oh);
1341 _wait_softreset_complete(oh);
1342 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1343 _disable_optional_clocks(oh);
1345 v = oh->_sysc_cache;
1346 sf = oh->class->sysc->sysc_flags;
1348 clkdm = _get_clkdm(oh);
1349 if (sf & SYSC_HAS_SIDLEMODE) {
1350 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1351 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1352 idlemode = HWMOD_IDLEMODE_NO;
1354 if (sf & SYSC_HAS_ENAWAKEUP)
1355 _enable_wakeup(oh, &v);
1356 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1357 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1359 idlemode = HWMOD_IDLEMODE_SMART;
1363 * This is special handling for some IPs like
1364 * 32k sync timer. Force them to idle!
1366 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1367 if (clkdm_act && !(oh->class->sysc->idlemodes &
1368 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1369 idlemode = HWMOD_IDLEMODE_FORCE;
1371 _set_slave_idlemode(oh, idlemode, &v);
1374 if (sf & SYSC_HAS_MIDLEMODE) {
1375 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1376 idlemode = HWMOD_IDLEMODE_FORCE;
1377 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1378 idlemode = HWMOD_IDLEMODE_NO;
1380 if (sf & SYSC_HAS_ENAWAKEUP)
1381 _enable_wakeup(oh, &v);
1382 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1383 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1385 idlemode = HWMOD_IDLEMODE_SMART;
1387 _set_master_standbymode(oh, idlemode, &v);
1391 * XXX The clock framework should handle this, by
1392 * calling into this code. But this must wait until the
1393 * clock structures are tagged with omap_hwmod entries
1395 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1396 (sf & SYSC_HAS_CLOCKACTIVITY))
1397 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1399 /* If the cached value is the same as the new value, skip the write */
1400 if (oh->_sysc_cache != v)
1401 _write_sysconfig(v, oh);
1404 * Set the autoidle bit only after setting the smartidle bit
1405 * Setting this will not have any impact on the other modules.
1407 if (sf & SYSC_HAS_AUTOIDLE) {
1408 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1410 _set_module_autoidle(oh, idlemode, &v);
1411 _write_sysconfig(v, oh);
1416 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1417 * @oh: struct omap_hwmod *
1419 * If module is marked as SWSUP_SIDLE, force the module into slave
1420 * idle; otherwise, configure it for smart-idle. If module is marked
1421 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1422 * configure it for smart-standby. No return value.
1424 static void _idle_sysc(struct omap_hwmod *oh)
1429 if (!oh->class->sysc)
1432 v = oh->_sysc_cache;
1433 sf = oh->class->sysc->sysc_flags;
1435 if (sf & SYSC_HAS_SIDLEMODE) {
1436 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1437 idlemode = HWMOD_IDLEMODE_FORCE;
1439 if (sf & SYSC_HAS_ENAWAKEUP)
1440 _enable_wakeup(oh, &v);
1441 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1442 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1444 idlemode = HWMOD_IDLEMODE_SMART;
1446 _set_slave_idlemode(oh, idlemode, &v);
1449 if (sf & SYSC_HAS_MIDLEMODE) {
1450 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1451 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1452 idlemode = HWMOD_IDLEMODE_FORCE;
1454 if (sf & SYSC_HAS_ENAWAKEUP)
1455 _enable_wakeup(oh, &v);
1456 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1457 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1459 idlemode = HWMOD_IDLEMODE_SMART;
1461 _set_master_standbymode(oh, idlemode, &v);
1464 _write_sysconfig(v, oh);
1468 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1469 * @oh: struct omap_hwmod *
1471 * Force the module into slave idle and master suspend. No return
1474 static void _shutdown_sysc(struct omap_hwmod *oh)
1479 if (!oh->class->sysc)
1482 v = oh->_sysc_cache;
1483 sf = oh->class->sysc->sysc_flags;
1485 if (sf & SYSC_HAS_SIDLEMODE)
1486 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1488 if (sf & SYSC_HAS_MIDLEMODE)
1489 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1491 if (sf & SYSC_HAS_AUTOIDLE)
1492 _set_module_autoidle(oh, 1, &v);
1494 _write_sysconfig(v, oh);
1498 * _lookup - find an omap_hwmod by name
1499 * @name: find an omap_hwmod by name
1501 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1503 static struct omap_hwmod *_lookup(const char *name)
1505 struct omap_hwmod *oh, *temp_oh;
1509 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1510 if (!strcmp(name, temp_oh->name)) {
1520 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1521 * @oh: struct omap_hwmod *
1523 * Convert a clockdomain name stored in a struct omap_hwmod into a
1524 * clockdomain pointer, and save it into the struct omap_hwmod.
1525 * Return -EINVAL if the clkdm_name lookup failed.
1527 static int _init_clkdm(struct omap_hwmod *oh)
1529 if (!oh->clkdm_name) {
1530 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1534 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1536 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1537 oh->name, oh->clkdm_name);
1541 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1542 oh->name, oh->clkdm_name);
1548 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1549 * well the clockdomain.
1550 * @oh: struct omap_hwmod *
1551 * @data: not used; pass NULL
1553 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1554 * Resolves all clock names embedded in the hwmod. Returns 0 on
1555 * success, or a negative error code on failure.
1557 static int _init_clocks(struct omap_hwmod *oh, void *data)
1561 if (oh->_state != _HWMOD_STATE_REGISTERED)
1564 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1566 if (soc_ops.init_clkdm)
1567 ret |= soc_ops.init_clkdm(oh);
1569 ret |= _init_main_clk(oh);
1570 ret |= _init_interface_clks(oh);
1571 ret |= _init_opt_clks(oh);
1574 oh->_state = _HWMOD_STATE_CLKS_INITED;
1576 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1582 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1583 * @oh: struct omap_hwmod *
1584 * @name: name of the reset line in the context of this hwmod
1585 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1587 * Return the bit position of the reset line that match the
1588 * input name. Return -ENOENT if not found.
1590 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1591 struct omap_hwmod_rst_info *ohri)
1595 for (i = 0; i < oh->rst_lines_cnt; i++) {
1596 const char *rst_line = oh->rst_lines[i].name;
1597 if (!strcmp(rst_line, name)) {
1598 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1599 ohri->st_shift = oh->rst_lines[i].st_shift;
1600 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1601 oh->name, __func__, rst_line, ohri->rst_shift,
1612 * _assert_hardreset - assert the HW reset line of submodules
1613 * contained in the hwmod module.
1614 * @oh: struct omap_hwmod *
1615 * @name: name of the reset line to lookup and assert
1617 * Some IP like dsp, ipu or iva contain processor that require an HW
1618 * reset line to be assert / deassert in order to enable fully the IP.
1619 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1620 * asserting the hardreset line on the currently-booted SoC, or passes
1621 * along the return value from _lookup_hardreset() or the SoC's
1622 * assert_hardreset code.
1624 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1626 struct omap_hwmod_rst_info ohri;
1632 if (!soc_ops.assert_hardreset)
1635 ret = _lookup_hardreset(oh, name, &ohri);
1639 ret = soc_ops.assert_hardreset(oh, &ohri);
1645 * _deassert_hardreset - deassert the HW reset line of submodules contained
1646 * in the hwmod module.
1647 * @oh: struct omap_hwmod *
1648 * @name: name of the reset line to look up and deassert
1650 * Some IP like dsp, ipu or iva contain processor that require an HW
1651 * reset line to be assert / deassert in order to enable fully the IP.
1652 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1653 * deasserting the hardreset line on the currently-booted SoC, or passes
1654 * along the return value from _lookup_hardreset() or the SoC's
1655 * deassert_hardreset code.
1657 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1659 struct omap_hwmod_rst_info ohri;
1666 if (!soc_ops.deassert_hardreset)
1669 ret = _lookup_hardreset(oh, name, &ohri);
1675 * A clockdomain must be in SW_SUP otherwise reset
1676 * might not be completed. The clockdomain can be set
1677 * in HW_AUTO only when the module become ready.
1679 hwsup = clkdm_in_hwsup(oh->clkdm);
1680 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1682 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1683 oh->name, oh->clkdm->name, ret);
1689 if (soc_ops.enable_module)
1690 soc_ops.enable_module(oh);
1692 ret = soc_ops.deassert_hardreset(oh, &ohri);
1694 if (soc_ops.disable_module)
1695 soc_ops.disable_module(oh);
1696 _disable_clocks(oh);
1699 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1703 * Set the clockdomain to HW_AUTO, assuming that the
1704 * previous state was HW_AUTO.
1707 clkdm_allow_idle(oh->clkdm);
1709 clkdm_hwmod_disable(oh->clkdm, oh);
1716 * _read_hardreset - read the HW reset line state of submodules
1717 * contained in the hwmod module
1718 * @oh: struct omap_hwmod *
1719 * @name: name of the reset line to look up and read
1721 * Return the state of the reset line. Returns -EINVAL if @oh is
1722 * null, -ENOSYS if we have no way of reading the hardreset line
1723 * status on the currently-booted SoC, or passes along the return
1724 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1727 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1729 struct omap_hwmod_rst_info ohri;
1735 if (!soc_ops.is_hardreset_asserted)
1738 ret = _lookup_hardreset(oh, name, &ohri);
1742 return soc_ops.is_hardreset_asserted(oh, &ohri);
1746 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1747 * @oh: struct omap_hwmod *
1749 * If all hardreset lines associated with @oh are asserted, then return true.
1750 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1751 * associated with @oh are asserted, then return false.
1752 * This function is used to avoid executing some parts of the IP block
1753 * enable/disable sequence if its hardreset line is set.
1755 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1759 if (oh->rst_lines_cnt == 0)
1762 for (i = 0; i < oh->rst_lines_cnt; i++)
1763 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1766 if (oh->rst_lines_cnt == rst_cnt)
1773 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1775 * @oh: struct omap_hwmod *
1777 * If any hardreset lines associated with @oh are asserted, then
1778 * return true. Otherwise, if no hardreset lines associated with @oh
1779 * are asserted, or if @oh has no hardreset lines, then return false.
1780 * This function is used to avoid executing some parts of the IP block
1781 * enable/disable sequence if any hardreset line is set.
1783 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1788 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1789 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1792 return (rst_cnt) ? true : false;
1796 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1797 * @oh: struct omap_hwmod *
1799 * Disable the PRCM module mode related to the hwmod @oh.
1800 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1802 static int _omap4_disable_module(struct omap_hwmod *oh)
1806 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1810 * Since integration code might still be doing something, only
1811 * disable if all lines are under hardreset.
1813 if (_are_any_hardreset_lines_asserted(oh))
1816 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1818 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1819 oh->prcm.omap4.clkctrl_offs);
1821 v = _omap4_wait_target_disable(oh);
1823 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1830 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1831 * @oh: struct omap_hwmod *
1833 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1834 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1835 * reset this way, -EINVAL if the hwmod is in the wrong state,
1836 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1838 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1839 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1840 * use the SYSCONFIG softreset bit to provide the status.
1842 * Note that some IP like McBSP do have reset control but don't have
1845 static int _ocp_softreset(struct omap_hwmod *oh)
1851 if (!oh->class->sysc ||
1852 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1855 /* clocks must be on for this operation */
1856 if (oh->_state != _HWMOD_STATE_ENABLED) {
1857 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1862 /* For some modules, all optionnal clocks need to be enabled as well */
1863 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1864 _enable_optional_clocks(oh);
1866 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1868 v = oh->_sysc_cache;
1869 ret = _set_softreset(oh, &v);
1873 _write_sysconfig(v, oh);
1875 if (oh->class->sysc->srst_udelay)
1876 udelay(oh->class->sysc->srst_udelay);
1878 c = _wait_softreset_complete(oh);
1879 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1880 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1881 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1885 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1888 ret = _clear_softreset(oh, &v);
1892 _write_sysconfig(v, oh);
1895 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1896 * _wait_target_ready() or _reset()
1900 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1901 _disable_optional_clocks(oh);
1907 * _reset - reset an omap_hwmod
1908 * @oh: struct omap_hwmod *
1910 * Resets an omap_hwmod @oh. If the module has a custom reset
1911 * function pointer defined, then call it to reset the IP block, and
1912 * pass along its return value to the caller. Otherwise, if the IP
1913 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1914 * associated with it, call a function to reset the IP block via that
1915 * method, and pass along the return value to the caller. Finally, if
1916 * the IP block has some hardreset lines associated with it, assert
1917 * all of those, but do _not_ deassert them. (This is because driver
1918 * authors have expressed an apparent requirement to control the
1919 * deassertion of the hardreset lines themselves.)
1921 * The default software reset mechanism for most OMAP IP blocks is
1922 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1923 * hwmods cannot be reset via this method. Some are not targets and
1924 * therefore have no OCP header registers to access. Others (like the
1925 * IVA) have idiosyncratic reset sequences. So for these relatively
1926 * rare cases, custom reset code can be supplied in the struct
1927 * omap_hwmod_class .reset function pointer.
1929 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1930 * does not prevent idling of the system. This is necessary for cases
1931 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1932 * kernel without disabling dma.
1934 * Passes along the return value from either _ocp_softreset() or the
1935 * custom reset function - these must return -EINVAL if the hwmod
1936 * cannot be reset this way or if the hwmod is in the wrong state,
1937 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1939 static int _reset(struct omap_hwmod *oh)
1943 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1945 if (oh->class->reset) {
1946 r = oh->class->reset(oh);
1948 if (oh->rst_lines_cnt > 0) {
1949 for (i = 0; i < oh->rst_lines_cnt; i++)
1950 _assert_hardreset(oh, oh->rst_lines[i].name);
1953 r = _ocp_softreset(oh);
1959 _set_dmadisable(oh);
1962 * OCP_SYSCONFIG bits need to be reprogrammed after a
1963 * softreset. The _enable() function should be split to avoid
1964 * the rewrite of the OCP_SYSCONFIG register.
1966 if (oh->class->sysc) {
1967 _update_sysc_cache(oh);
1975 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1977 * Call the appropriate PRM function to clear any logged I/O chain
1978 * wakeups and to reconfigure the chain. This apparently needs to be
1979 * done upon every mux change. Since hwmods can be concurrently
1980 * enabled and idled, hold a spinlock around the I/O chain
1981 * reconfiguration sequence. No return value.
1983 * XXX When the PRM code is moved to drivers, this function can be removed,
1984 * as the PRM infrastructure should abstract this.
1986 static void _reconfigure_io_chain(void)
1988 unsigned long flags;
1990 spin_lock_irqsave(&io_chain_lock, flags);
1992 omap_prm_reconfigure_io_chain();
1994 spin_unlock_irqrestore(&io_chain_lock, flags);
1998 * _omap4_update_context_lost - increment hwmod context loss counter if
1999 * hwmod context was lost, and clear hardware context loss reg
2000 * @oh: hwmod to check for context loss
2002 * If the PRCM indicates that the hwmod @oh lost context, increment
2003 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2004 * bits. No return value.
2006 static void _omap4_update_context_lost(struct omap_hwmod *oh)
2008 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
2011 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2012 oh->clkdm->pwrdm.ptr->prcm_offs,
2013 oh->prcm.omap4.context_offs))
2016 oh->prcm.omap4.context_lost_counter++;
2017 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2018 oh->clkdm->pwrdm.ptr->prcm_offs,
2019 oh->prcm.omap4.context_offs);
2023 * _omap4_get_context_lost - get context loss counter for a hwmod
2024 * @oh: hwmod to get context loss counter for
2026 * Returns the in-memory context loss counter for a hwmod.
2028 static int _omap4_get_context_lost(struct omap_hwmod *oh)
2030 return oh->prcm.omap4.context_lost_counter;
2034 * _enable_preprogram - Pre-program an IP block during the _enable() process
2035 * @oh: struct omap_hwmod *
2037 * Some IP blocks (such as AESS) require some additional programming
2038 * after enable before they can enter idle. If a function pointer to
2039 * do so is present in the hwmod data, then call it and pass along the
2040 * return value; otherwise, return 0.
2042 static int _enable_preprogram(struct omap_hwmod *oh)
2044 if (!oh->class->enable_preprogram)
2047 return oh->class->enable_preprogram(oh);
2051 * _enable - enable an omap_hwmod
2052 * @oh: struct omap_hwmod *
2054 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2055 * register target. Returns -EINVAL if the hwmod is in the wrong
2056 * state or passes along the return value of _wait_target_ready().
2058 static int _enable(struct omap_hwmod *oh)
2063 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2066 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2067 * state at init. Now that someone is really trying to enable
2068 * them, just ensure that the hwmod mux is set.
2070 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2072 * If the caller has mux data populated, do the mux'ing
2073 * which wouldn't have been done as part of the _enable()
2074 * done during setup.
2077 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2079 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2083 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2084 oh->_state != _HWMOD_STATE_IDLE &&
2085 oh->_state != _HWMOD_STATE_DISABLED) {
2086 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2092 * If an IP block contains HW reset lines and all of them are
2093 * asserted, we let integration code associated with that
2094 * block handle the enable. We've received very little
2095 * information on what those driver authors need, and until
2096 * detailed information is provided and the driver code is
2097 * posted to the public lists, this is probably the best we
2100 if (_are_all_hardreset_lines_asserted(oh))
2103 /* Mux pins for device runtime if populated */
2104 if (oh->mux && (!oh->mux->enabled ||
2105 ((oh->_state == _HWMOD_STATE_IDLE) &&
2106 oh->mux->pads_dynamic))) {
2107 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2108 _reconfigure_io_chain();
2109 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) {
2110 _reconfigure_io_chain();
2113 _add_initiator_dep(oh, mpu_oh);
2117 * A clockdomain must be in SW_SUP before enabling
2118 * completely the module. The clockdomain can be set
2119 * in HW_AUTO only when the module become ready.
2121 hwsup = clkdm_in_hwsup(oh->clkdm) &&
2122 !clkdm_missing_idle_reporting(oh->clkdm);
2123 r = clkdm_hwmod_enable(oh->clkdm, oh);
2125 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2126 oh->name, oh->clkdm->name, r);
2132 if (soc_ops.enable_module)
2133 soc_ops.enable_module(oh);
2134 if (oh->flags & HWMOD_BLOCK_WFI)
2135 cpu_idle_poll_ctrl(true);
2137 if (soc_ops.update_context_lost)
2138 soc_ops.update_context_lost(oh);
2140 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2144 * Set the clockdomain to HW_AUTO only if the target is ready,
2145 * assuming that the previous state was HW_AUTO
2147 if (oh->clkdm && hwsup)
2148 clkdm_allow_idle(oh->clkdm);
2150 oh->_state = _HWMOD_STATE_ENABLED;
2152 /* Access the sysconfig only if the target is ready */
2153 if (oh->class->sysc) {
2154 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2155 _update_sysc_cache(oh);
2158 r = _enable_preprogram(oh);
2160 if (soc_ops.disable_module)
2161 soc_ops.disable_module(oh);
2162 _disable_clocks(oh);
2163 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
2167 clkdm_hwmod_disable(oh->clkdm, oh);
2174 * _idle - idle an omap_hwmod
2175 * @oh: struct omap_hwmod *
2177 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2178 * no further work. Returns -EINVAL if the hwmod is in the wrong
2179 * state or returns 0.
2181 static int _idle(struct omap_hwmod *oh)
2183 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2185 if (oh->_state != _HWMOD_STATE_ENABLED) {
2186 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2191 if (_are_all_hardreset_lines_asserted(oh))
2194 if (oh->class->sysc)
2196 _del_initiator_dep(oh, mpu_oh);
2198 if (oh->flags & HWMOD_BLOCK_WFI)
2199 cpu_idle_poll_ctrl(false);
2200 if (soc_ops.disable_module)
2201 soc_ops.disable_module(oh);
2204 * The module must be in idle mode before disabling any parents
2205 * clocks. Otherwise, the parent clock might be disabled before
2206 * the module transition is done, and thus will prevent the
2207 * transition to complete properly.
2209 _disable_clocks(oh);
2211 clkdm_hwmod_disable(oh->clkdm, oh);
2213 /* Mux pins for device idle if populated */
2214 if (oh->mux && oh->mux->pads_dynamic) {
2215 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2216 _reconfigure_io_chain();
2217 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) {
2218 _reconfigure_io_chain();
2221 oh->_state = _HWMOD_STATE_IDLE;
2227 * _shutdown - shutdown an omap_hwmod
2228 * @oh: struct omap_hwmod *
2230 * Shut down an omap_hwmod @oh. This should be called when the driver
2231 * used for the hwmod is removed or unloaded or if the driver is not
2232 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2233 * state or returns 0.
2235 static int _shutdown(struct omap_hwmod *oh)
2240 if (oh->_state != _HWMOD_STATE_IDLE &&
2241 oh->_state != _HWMOD_STATE_ENABLED) {
2242 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2247 if (_are_all_hardreset_lines_asserted(oh))
2250 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2252 if (oh->class->pre_shutdown) {
2253 prev_state = oh->_state;
2254 if (oh->_state == _HWMOD_STATE_IDLE)
2256 ret = oh->class->pre_shutdown(oh);
2258 if (prev_state == _HWMOD_STATE_IDLE)
2264 if (oh->class->sysc) {
2265 if (oh->_state == _HWMOD_STATE_IDLE)
2270 /* clocks and deps are already disabled in idle */
2271 if (oh->_state == _HWMOD_STATE_ENABLED) {
2272 _del_initiator_dep(oh, mpu_oh);
2273 /* XXX what about the other system initiators here? dma, dsp */
2274 if (oh->flags & HWMOD_BLOCK_WFI)
2275 cpu_idle_poll_ctrl(false);
2276 if (soc_ops.disable_module)
2277 soc_ops.disable_module(oh);
2278 _disable_clocks(oh);
2280 clkdm_hwmod_disable(oh->clkdm, oh);
2282 /* XXX Should this code also force-disable the optional clocks? */
2284 for (i = 0; i < oh->rst_lines_cnt; i++)
2285 _assert_hardreset(oh, oh->rst_lines[i].name);
2287 /* Mux pins to safe mode or use populated off mode values */
2289 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2291 oh->_state = _HWMOD_STATE_DISABLED;
2296 static int of_dev_find_hwmod(struct device_node *np,
2297 struct omap_hwmod *oh)
2302 count = of_property_count_strings(np, "ti,hwmods");
2306 for (i = 0; i < count; i++) {
2307 res = of_property_read_string_index(np, "ti,hwmods",
2311 if (!strcmp(p, oh->name)) {
2312 pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n",
2313 np->name, i, oh->name);
2322 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2323 * @np: struct device_node *
2324 * @oh: struct omap_hwmod *
2325 * @index: index of the entry found
2326 * @found: struct device_node * found or NULL
2328 * Parse the dt blob and find out needed hwmod. Recursive function is
2329 * implemented to take care hierarchical dt blob parsing.
2330 * Return: Returns 0 on success, -ENODEV when not found.
2332 static int of_dev_hwmod_lookup(struct device_node *np,
2333 struct omap_hwmod *oh,
2335 struct device_node **found)
2337 struct device_node *np0 = NULL;
2340 res = of_dev_find_hwmod(np, oh);
2347 for_each_child_of_node(np, np0) {
2348 struct device_node *fc;
2351 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2366 * _init_mpu_rt_base - populate the virtual address for a hwmod
2367 * @oh: struct omap_hwmod * to locate the virtual address
2368 * @data: (unused, caller should pass NULL)
2369 * @index: index of the reg entry iospace in device tree
2370 * @np: struct device_node * of the IP block's device node in the DT data
2372 * Cache the virtual address used by the MPU to access this IP block's
2373 * registers. This address is needed early so the OCP registers that
2374 * are part of the device's address space can be ioremapped properly.
2376 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2377 * -ENXIO on absent or invalid register target address space.
2379 static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2380 int index, struct device_node *np)
2382 struct omap_hwmod_addr_space *mem;
2383 void __iomem *va_start = NULL;
2388 _save_mpu_port_index(oh);
2390 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2393 mem = _find_mpu_rt_addr_space(oh);
2395 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2398 /* Extract the IO space from device tree blob */
2402 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2404 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2409 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2411 pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n",
2412 oh->name, index, np->full_name);
2416 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2417 oh->name, va_start);
2419 oh->_mpu_rt_va = va_start;
2424 * _init - initialize internal data for the hwmod @oh
2425 * @oh: struct omap_hwmod *
2428 * Look up the clocks and the address space used by the MPU to access
2429 * registers belonging to the hwmod @oh. @oh must already be
2430 * registered at this point. This is the first of two phases for
2431 * hwmod initialization. Code called here does not touch any hardware
2432 * registers, it simply prepares internal data structures. Returns 0
2433 * upon success or if the hwmod isn't registered or if the hwmod's
2434 * address space is not defined, or -EINVAL upon failure.
2436 static int __init _init(struct omap_hwmod *oh, void *data)
2439 struct device_node *np = NULL;
2441 if (oh->_state != _HWMOD_STATE_REGISTERED)
2444 if (of_have_populated_dt()) {
2445 struct device_node *bus;
2447 bus = of_find_node_by_name(NULL, "ocp");
2451 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2453 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2454 else if (np && index)
2455 pr_warn("omap_hwmod: %s using broken dt data from %s\n",
2456 oh->name, np->name);
2459 if (oh->class->sysc) {
2460 r = _init_mpu_rt_base(oh, NULL, index, np);
2462 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2468 r = _init_clocks(oh, NULL);
2470 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2475 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2476 oh->flags |= HWMOD_INIT_NO_RESET;
2477 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2478 oh->flags |= HWMOD_INIT_NO_IDLE;
2481 oh->_state = _HWMOD_STATE_INITIALIZED;
2487 * _setup_iclk_autoidle - configure an IP block's interface clocks
2488 * @oh: struct omap_hwmod *
2490 * Set up the module's interface clocks. XXX This function is still mostly
2491 * a stub; implementing this properly requires iclk autoidle usecounting in
2492 * the clock code. No return value.
2494 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2496 struct omap_hwmod_ocp_if *os;
2497 struct list_head *p;
2499 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2502 p = oh->slave_ports.next;
2504 while (i < oh->slaves_cnt) {
2505 os = _fetch_next_ocp_if(&p, &i);
2509 if (os->flags & OCPIF_SWSUP_IDLE) {
2510 /* XXX omap_iclk_deny_idle(c); */
2512 /* XXX omap_iclk_allow_idle(c); */
2513 clk_enable(os->_clk);
2521 * _setup_reset - reset an IP block during the setup process
2522 * @oh: struct omap_hwmod *
2524 * Reset the IP block corresponding to the hwmod @oh during the setup
2525 * process. The IP block is first enabled so it can be successfully
2526 * reset. Returns 0 upon success or a negative error code upon
2529 static int __init _setup_reset(struct omap_hwmod *oh)
2533 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2536 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2539 if (oh->rst_lines_cnt == 0) {
2542 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2543 oh->name, oh->_state);
2548 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2555 * _setup_postsetup - transition to the appropriate state after _setup
2556 * @oh: struct omap_hwmod *
2558 * Place an IP block represented by @oh into a "post-setup" state --
2559 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2560 * this function is called at the end of _setup().) The postsetup
2561 * state for an IP block can be changed by calling
2562 * omap_hwmod_enter_postsetup_state() early in the boot process,
2563 * before one of the omap_hwmod_setup*() functions are called for the
2566 * The IP block stays in this state until a PM runtime-based driver is
2567 * loaded for that IP block. A post-setup state of IDLE is
2568 * appropriate for almost all IP blocks with runtime PM-enabled
2569 * drivers, since those drivers are able to enable the IP block. A
2570 * post-setup state of ENABLED is appropriate for kernels with PM
2571 * runtime disabled. The DISABLED state is appropriate for unusual IP
2572 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2573 * included, since the WDTIMER starts running on reset and will reset
2574 * the MPU if left active.
2576 * This post-setup mechanism is deprecated. Once all of the OMAP
2577 * drivers have been converted to use PM runtime, and all of the IP
2578 * block data and interconnect data is available to the hwmod code, it
2579 * should be possible to replace this mechanism with a "lazy reset"
2580 * arrangement. In a "lazy reset" setup, each IP block is enabled
2581 * when the driver first probes, then all remaining IP blocks without
2582 * drivers are either shut down or enabled after the drivers have
2583 * loaded. However, this cannot take place until the above
2584 * preconditions have been met, since otherwise the late reset code
2585 * has no way of knowing which IP blocks are in use by drivers, and
2586 * which ones are unused.
2590 static void __init _setup_postsetup(struct omap_hwmod *oh)
2594 if (oh->rst_lines_cnt > 0)
2597 postsetup_state = oh->_postsetup_state;
2598 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2599 postsetup_state = _HWMOD_STATE_ENABLED;
2602 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2603 * it should be set by the core code as a runtime flag during startup
2605 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2606 (postsetup_state == _HWMOD_STATE_IDLE)) {
2607 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2608 postsetup_state = _HWMOD_STATE_ENABLED;
2611 if (postsetup_state == _HWMOD_STATE_IDLE)
2613 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2615 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2616 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2617 oh->name, postsetup_state);
2623 * _setup - prepare IP block hardware for use
2624 * @oh: struct omap_hwmod *
2625 * @n: (unused, pass NULL)
2627 * Configure the IP block represented by @oh. This may include
2628 * enabling the IP block, resetting it, and placing it into a
2629 * post-setup state, depending on the type of IP block and applicable
2630 * flags. IP blocks are reset to prevent any previous configuration
2631 * by the bootloader or previous operating system from interfering
2632 * with power management or other parts of the system. The reset can
2633 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2634 * two phases for hwmod initialization. Code called here generally
2635 * affects the IP block hardware, or system integration hardware
2636 * associated with the IP block. Returns 0.
2638 static int __init _setup(struct omap_hwmod *oh, void *data)
2640 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2643 if (oh->parent_hwmod) {
2646 r = _enable(oh->parent_hwmod);
2647 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2648 oh->name, oh->parent_hwmod->name);
2651 _setup_iclk_autoidle(oh);
2653 if (!_setup_reset(oh))
2654 _setup_postsetup(oh);
2656 if (oh->parent_hwmod) {
2659 postsetup_state = oh->parent_hwmod->_postsetup_state;
2661 if (postsetup_state == _HWMOD_STATE_IDLE)
2662 _idle(oh->parent_hwmod);
2663 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2664 _shutdown(oh->parent_hwmod);
2665 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2666 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2667 oh->parent_hwmod->name, postsetup_state);
2674 * _register - register a struct omap_hwmod
2675 * @oh: struct omap_hwmod *
2677 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2678 * already has been registered by the same name; -EINVAL if the
2679 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2680 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2681 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2684 * XXX The data should be copied into bootmem, so the original data
2685 * should be marked __initdata and freed after init. This would allow
2686 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2687 * that the copy process would be relatively complex due to the large number
2690 static int __init _register(struct omap_hwmod *oh)
2692 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2693 (oh->_state != _HWMOD_STATE_UNKNOWN))
2696 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2698 if (_lookup(oh->name))
2701 list_add_tail(&oh->node, &omap_hwmod_list);
2703 INIT_LIST_HEAD(&oh->master_ports);
2704 INIT_LIST_HEAD(&oh->slave_ports);
2705 spin_lock_init(&oh->_lock);
2706 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2708 oh->_state = _HWMOD_STATE_REGISTERED;
2711 * XXX Rather than doing a strcmp(), this should test a flag
2712 * set in the hwmod data, inserted by the autogenerator code.
2714 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2721 * _alloc_links - return allocated memory for hwmod links
2722 * @ml: pointer to a struct omap_hwmod_link * for the master link
2723 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2725 * Return pointers to two struct omap_hwmod_link records, via the
2726 * addresses pointed to by @ml and @sl. Will first attempt to return
2727 * memory allocated as part of a large initial block, but if that has
2728 * been exhausted, will allocate memory itself. Since ideally this
2729 * second allocation path will never occur, the number of these
2730 * 'supplemental' allocations will be logged when debugging is
2731 * enabled. Returns 0.
2733 static int __init _alloc_links(struct omap_hwmod_link **ml,
2734 struct omap_hwmod_link **sl)
2738 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2739 *ml = &linkspace[free_ls++];
2740 *sl = &linkspace[free_ls++];
2744 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2747 *ml = memblock_virt_alloc(sz, 0);
2749 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2752 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2753 ls_supp * LINKS_PER_OCP_IF);
2759 * _add_link - add an interconnect between two IP blocks
2760 * @oi: pointer to a struct omap_hwmod_ocp_if record
2762 * Add struct omap_hwmod_link records connecting the master IP block
2763 * specified in @oi->master to @oi, and connecting the slave IP block
2764 * specified in @oi->slave to @oi. This code is assumed to run before
2765 * preemption or SMP has been enabled, thus avoiding the need for
2766 * locking in this code. Changes to this assumption will require
2767 * additional locking. Returns 0.
2769 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2771 struct omap_hwmod_link *ml, *sl;
2773 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2776 _alloc_links(&ml, &sl);
2779 list_add(&ml->node, &oi->master->master_ports);
2780 oi->master->masters_cnt++;
2783 list_add(&sl->node, &oi->slave->slave_ports);
2784 oi->slave->slaves_cnt++;
2790 * _register_link - register a struct omap_hwmod_ocp_if
2791 * @oi: struct omap_hwmod_ocp_if *
2793 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2794 * has already been registered; -EINVAL if @oi is NULL or if the
2795 * record pointed to by @oi is missing required fields; or 0 upon
2798 * XXX The data should be copied into bootmem, so the original data
2799 * should be marked __initdata and freed after init. This would allow
2800 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2802 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2804 if (!oi || !oi->master || !oi->slave || !oi->user)
2807 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2810 pr_debug("omap_hwmod: registering link from %s to %s\n",
2811 oi->master->name, oi->slave->name);
2814 * Register the connected hwmods, if they haven't been
2815 * registered already
2817 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2818 _register(oi->master);
2820 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2821 _register(oi->slave);
2825 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2831 * _alloc_linkspace - allocate large block of hwmod links
2832 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2834 * Allocate a large block of struct omap_hwmod_link records. This
2835 * improves boot time significantly by avoiding the need to allocate
2836 * individual records one by one. If the number of records to
2837 * allocate in the block hasn't been manually specified, this function
2838 * will count the number of struct omap_hwmod_ocp_if records in @ois
2839 * and use that to determine the allocation size. For SoC families
2840 * that require multiple list registrations, such as OMAP3xxx, this
2841 * estimation process isn't optimal, so manual estimation is advised
2842 * in those cases. Returns -EEXIST if the allocation has already occurred
2843 * or 0 upon success.
2845 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2851 WARN(1, "linkspace already allocated\n");
2857 max_ls += LINKS_PER_OCP_IF;
2859 sz = sizeof(struct omap_hwmod_link) * max_ls;
2861 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2862 __func__, sz, max_ls);
2864 linkspace = memblock_virt_alloc(sz, 0);
2869 /* Static functions intended only for use in soc_ops field function pointers */
2872 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2873 * @oh: struct omap_hwmod *
2875 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2876 * does not have an IDLEST bit or if the module successfully leaves
2877 * slave idle; otherwise, pass along the return value of the
2878 * appropriate *_cm*_wait_module_ready() function.
2880 static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2885 if (oh->flags & HWMOD_NO_IDLEST)
2888 if (!_find_mpu_rt_port(oh))
2891 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2893 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2894 oh->prcm.omap2.idlest_reg_id,
2895 oh->prcm.omap2.idlest_idle_bit);
2899 * _omap4_wait_target_ready - wait for a module to leave slave idle
2900 * @oh: struct omap_hwmod *
2902 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2903 * does not have an IDLEST bit or if the module successfully leaves
2904 * slave idle; otherwise, pass along the return value of the
2905 * appropriate *_cm*_wait_module_ready() function.
2907 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2912 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2915 if (!_find_mpu_rt_port(oh))
2918 /* XXX check module SIDLEMODE, hardreset status */
2920 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2922 oh->prcm.omap4.clkctrl_offs, 0);
2926 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2927 * @oh: struct omap_hwmod * to assert hardreset
2928 * @ohri: hardreset line data
2930 * Call omap2_prm_assert_hardreset() with parameters extracted from
2931 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2932 * use as an soc_ops function pointer. Passes along the return value
2933 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2934 * for removal when the PRM code is moved into drivers/.
2936 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2937 struct omap_hwmod_rst_info *ohri)
2939 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2940 oh->prcm.omap2.module_offs, 0);
2944 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2945 * @oh: struct omap_hwmod * to deassert hardreset
2946 * @ohri: hardreset line data
2948 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2949 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2950 * use as an soc_ops function pointer. Passes along the return value
2951 * from omap2_prm_deassert_hardreset(). XXX This function is
2952 * scheduled for removal when the PRM code is moved into drivers/.
2954 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2955 struct omap_hwmod_rst_info *ohri)
2957 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2958 oh->prcm.omap2.module_offs, 0, 0);
2962 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2963 * @oh: struct omap_hwmod * to test hardreset
2964 * @ohri: hardreset line data
2966 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2967 * from the hwmod @oh and the hardreset line data @ohri. Only
2968 * intended for use as an soc_ops function pointer. Passes along the
2969 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2970 * function is scheduled for removal when the PRM code is moved into
2973 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2974 struct omap_hwmod_rst_info *ohri)
2976 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2977 oh->prcm.omap2.module_offs, 0);
2981 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2982 * @oh: struct omap_hwmod * to assert hardreset
2983 * @ohri: hardreset line data
2985 * Call omap4_prminst_assert_hardreset() with parameters extracted
2986 * from the hwmod @oh and the hardreset line data @ohri. Only
2987 * intended for use as an soc_ops function pointer. Passes along the
2988 * return value from omap4_prminst_assert_hardreset(). XXX This
2989 * function is scheduled for removal when the PRM code is moved into
2992 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2993 struct omap_hwmod_rst_info *ohri)
2998 return omap_prm_assert_hardreset(ohri->rst_shift,
2999 oh->clkdm->pwrdm.ptr->prcm_partition,
3000 oh->clkdm->pwrdm.ptr->prcm_offs,
3001 oh->prcm.omap4.rstctrl_offs);
3005 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3006 * @oh: struct omap_hwmod * to deassert hardreset
3007 * @ohri: hardreset line data
3009 * Call omap4_prminst_deassert_hardreset() with parameters extracted
3010 * from the hwmod @oh and the hardreset line data @ohri. Only
3011 * intended for use as an soc_ops function pointer. Passes along the
3012 * return value from omap4_prminst_deassert_hardreset(). XXX This
3013 * function is scheduled for removal when the PRM code is moved into
3016 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
3017 struct omap_hwmod_rst_info *ohri)
3023 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3024 oh->name, ohri->name);
3025 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
3026 oh->clkdm->pwrdm.ptr->prcm_partition,
3027 oh->clkdm->pwrdm.ptr->prcm_offs,
3028 oh->prcm.omap4.rstctrl_offs,
3029 oh->prcm.omap4.rstctrl_offs +
3030 OMAP4_RST_CTRL_ST_OFFSET);
3034 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3035 * @oh: struct omap_hwmod * to test hardreset
3036 * @ohri: hardreset line data
3038 * Call omap4_prminst_is_hardreset_asserted() with parameters
3039 * extracted from the hwmod @oh and the hardreset line data @ohri.
3040 * Only intended for use as an soc_ops function pointer. Passes along
3041 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3042 * This function is scheduled for removal when the PRM code is moved
3045 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3046 struct omap_hwmod_rst_info *ohri)
3051 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
3052 oh->clkdm->pwrdm.ptr->
3054 oh->clkdm->pwrdm.ptr->prcm_offs,
3055 oh->prcm.omap4.rstctrl_offs);
3059 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3060 * @oh: struct omap_hwmod * to deassert hardreset
3061 * @ohri: hardreset line data
3063 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3064 * from the hwmod @oh and the hardreset line data @ohri. Only
3065 * intended for use as an soc_ops function pointer. Passes along the
3066 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3067 * function is scheduled for removal when the PRM code is moved into
3070 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3071 struct omap_hwmod_rst_info *ohri)
3073 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
3074 oh->clkdm->pwrdm.ptr->prcm_partition,
3075 oh->clkdm->pwrdm.ptr->prcm_offs,
3076 oh->prcm.omap4.rstctrl_offs,
3077 oh->prcm.omap4.rstst_offs);
3080 /* Public functions */
3082 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3084 if (oh->flags & HWMOD_16BIT_REG)
3085 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
3087 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
3090 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3092 if (oh->flags & HWMOD_16BIT_REG)
3093 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
3095 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
3099 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3100 * @oh: struct omap_hwmod *
3102 * This is a public function exposed to drivers. Some drivers may need to do
3103 * some settings before and after resetting the device. Those drivers after
3104 * doing the necessary settings could use this function to start a reset by
3105 * setting the SYSCONFIG.SOFTRESET bit.
3107 int omap_hwmod_softreset(struct omap_hwmod *oh)
3112 if (!oh || !(oh->_sysc_cache))
3115 v = oh->_sysc_cache;
3116 ret = _set_softreset(oh, &v);
3119 _write_sysconfig(v, oh);
3121 ret = _clear_softreset(oh, &v);
3124 _write_sysconfig(v, oh);
3131 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3132 * @name: name of the omap_hwmod to look up
3134 * Given a @name of an omap_hwmod, return a pointer to the registered
3135 * struct omap_hwmod *, or NULL upon error.
3137 struct omap_hwmod *omap_hwmod_lookup(const char *name)
3139 struct omap_hwmod *oh;
3150 * omap_hwmod_for_each - call function for each registered omap_hwmod
3151 * @fn: pointer to a callback function
3152 * @data: void * data to pass to callback function
3154 * Call @fn for each registered omap_hwmod, passing @data to each
3155 * function. @fn must return 0 for success or any other value for
3156 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3157 * will stop and the non-zero return value will be passed to the
3158 * caller of omap_hwmod_for_each(). @fn is called with
3159 * omap_hwmod_for_each() held.
3161 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3164 struct omap_hwmod *temp_oh;
3170 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3171 ret = (*fn)(temp_oh, data);
3180 * omap_hwmod_register_links - register an array of hwmod links
3181 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3183 * Intended to be called early in boot before the clock framework is
3184 * initialized. If @ois is not null, will register all omap_hwmods
3185 * listed in @ois that are valid for this chip. Returns -EINVAL if
3186 * omap_hwmod_init() hasn't been called before calling this function,
3187 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3190 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3200 if (ois[0] == NULL) /* Empty list */
3204 if (_alloc_linkspace(ois)) {
3205 pr_err("omap_hwmod: could not allocate link space\n");
3212 r = _register_link(ois[i]);
3213 WARN(r && r != -EEXIST,
3214 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3215 ois[i]->master->name, ois[i]->slave->name, r);
3222 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3223 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3225 * If the hwmod data corresponding to the MPU subsystem IP block
3226 * hasn't been initialized and set up yet, do so now. This must be
3227 * done first since sleep dependencies may be added from other hwmods
3228 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3231 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3233 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3234 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3235 __func__, MPU_INITIATOR_NAME);
3236 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3237 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3241 * omap_hwmod_setup_one - set up a single hwmod
3242 * @oh_name: const char * name of the already-registered hwmod to set up
3244 * Initialize and set up a single hwmod. Intended to be used for a
3245 * small number of early devices, such as the timer IP blocks used for
3246 * the scheduler clock. Must be called after omap2_clk_init().
3247 * Resolves the struct clk names to struct clk pointers for each
3248 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3249 * -EINVAL upon error or 0 upon success.
3251 int __init omap_hwmod_setup_one(const char *oh_name)
3253 struct omap_hwmod *oh;
3255 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3257 oh = _lookup(oh_name);
3259 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3263 _ensure_mpu_hwmod_is_setup(oh);
3272 * omap_hwmod_setup_all - set up all registered IP blocks
3274 * Initialize and set up all IP blocks registered with the hwmod code.
3275 * Must be called after omap2_clk_init(). Resolves the struct clk
3276 * names to struct clk pointers for each registered omap_hwmod. Also
3277 * calls _setup() on each hwmod. Returns 0 upon success.
3279 static int __init omap_hwmod_setup_all(void)
3281 _ensure_mpu_hwmod_is_setup(NULL);
3283 omap_hwmod_for_each(_init, NULL);
3284 omap_hwmod_for_each(_setup, NULL);
3288 omap_core_initcall(omap_hwmod_setup_all);
3291 * omap_hwmod_enable - enable an omap_hwmod
3292 * @oh: struct omap_hwmod *
3294 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3295 * Returns -EINVAL on error or passes along the return value from _enable().
3297 int omap_hwmod_enable(struct omap_hwmod *oh)
3300 unsigned long flags;
3305 spin_lock_irqsave(&oh->_lock, flags);
3307 spin_unlock_irqrestore(&oh->_lock, flags);
3313 * omap_hwmod_idle - idle an omap_hwmod
3314 * @oh: struct omap_hwmod *
3316 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3317 * Returns -EINVAL on error or passes along the return value from _idle().
3319 int omap_hwmod_idle(struct omap_hwmod *oh)
3322 unsigned long flags;
3327 spin_lock_irqsave(&oh->_lock, flags);
3329 spin_unlock_irqrestore(&oh->_lock, flags);
3335 * omap_hwmod_shutdown - shutdown an omap_hwmod
3336 * @oh: struct omap_hwmod *
3338 * Shutdown an omap_hwmod @oh. Intended to be called by
3339 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3340 * the return value from _shutdown().
3342 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3345 unsigned long flags;
3350 spin_lock_irqsave(&oh->_lock, flags);
3352 spin_unlock_irqrestore(&oh->_lock, flags);
3358 * IP block data retrieval functions
3362 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3363 * @oh: struct omap_hwmod *
3364 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3366 * Count the number of struct resource array elements necessary to
3367 * contain omap_hwmod @oh resources. Intended to be called by code
3368 * that registers omap_devices. Intended to be used to determine the
3369 * size of a dynamically-allocated struct resource array, before
3370 * calling omap_hwmod_fill_resources(). Returns the number of struct
3371 * resource array elements needed.
3373 * XXX This code is not optimized. It could attempt to merge adjacent
3377 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3381 if (flags & IORESOURCE_IRQ)
3382 ret += _count_mpu_irqs(oh);
3384 if (flags & IORESOURCE_DMA)
3385 ret += _count_sdma_reqs(oh);
3387 if (flags & IORESOURCE_MEM) {
3389 struct omap_hwmod_ocp_if *os;
3390 struct list_head *p = oh->slave_ports.next;
3392 while (i < oh->slaves_cnt) {
3393 os = _fetch_next_ocp_if(&p, &i);
3394 ret += _count_ocp_if_addr_spaces(os);
3402 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3403 * @oh: struct omap_hwmod *
3404 * @res: pointer to the first element of an array of struct resource to fill
3406 * Fill the struct resource array @res with resource data from the
3407 * omap_hwmod @oh. Intended to be called by code that registers
3408 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3409 * number of array elements filled.
3411 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3413 struct omap_hwmod_ocp_if *os;
3414 struct list_head *p;
3415 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3418 /* For each IRQ, DMA, memory area, fill in array.*/
3420 mpu_irqs_cnt = _count_mpu_irqs(oh);
3421 for (i = 0; i < mpu_irqs_cnt; i++) {
3425 irq = oh->xlate_irq((oh->mpu_irqs + i)->irq);
3427 irq = (oh->mpu_irqs + i)->irq;
3428 (res + r)->name = (oh->mpu_irqs + i)->name;
3429 (res + r)->start = irq;
3430 (res + r)->end = irq;
3431 (res + r)->flags = IORESOURCE_IRQ;
3435 sdma_reqs_cnt = _count_sdma_reqs(oh);
3436 for (i = 0; i < sdma_reqs_cnt; i++) {
3437 (res + r)->name = (oh->sdma_reqs + i)->name;
3438 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3439 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3440 (res + r)->flags = IORESOURCE_DMA;
3444 p = oh->slave_ports.next;
3447 while (i < oh->slaves_cnt) {
3448 os = _fetch_next_ocp_if(&p, &i);
3449 addr_cnt = _count_ocp_if_addr_spaces(os);
3451 for (j = 0; j < addr_cnt; j++) {
3452 (res + r)->name = (os->addr + j)->name;
3453 (res + r)->start = (os->addr + j)->pa_start;
3454 (res + r)->end = (os->addr + j)->pa_end;
3455 (res + r)->flags = IORESOURCE_MEM;
3464 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3465 * @oh: struct omap_hwmod *
3466 * @res: pointer to the array of struct resource to fill
3468 * Fill the struct resource array @res with dma resource data from the
3469 * omap_hwmod @oh. Intended to be called by code that registers
3470 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3471 * number of array elements filled.
3473 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3475 int i, sdma_reqs_cnt;
3478 sdma_reqs_cnt = _count_sdma_reqs(oh);
3479 for (i = 0; i < sdma_reqs_cnt; i++) {
3480 (res + r)->name = (oh->sdma_reqs + i)->name;
3481 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3482 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3483 (res + r)->flags = IORESOURCE_DMA;
3491 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3492 * @oh: struct omap_hwmod * to operate on
3493 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3494 * @name: pointer to the name of the data to fetch (optional)
3495 * @rsrc: pointer to a struct resource, allocated by the caller
3497 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3498 * data for the IP block pointed to by @oh. The data will be filled
3499 * into a struct resource record pointed to by @rsrc. The struct
3500 * resource must be allocated by the caller. When @name is non-null,
3501 * the data associated with the matching entry in the IRQ/SDMA/address
3502 * space hwmod data arrays will be returned. If @name is null, the
3503 * first array entry will be returned. Data order is not meaningful
3504 * in hwmod data, so callers are strongly encouraged to use a non-null
3505 * @name whenever possible to avoid unpredictable effects if hwmod
3506 * data is later added that causes data ordering to change. This
3507 * function is only intended for use by OMAP core code. Device
3508 * drivers should not call this function - the appropriate bus-related
3509 * data accessor functions should be used instead. Returns 0 upon
3510 * success or a negative error code upon error.
3512 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3513 const char *name, struct resource *rsrc)
3516 unsigned int irq, dma;
3517 u32 pa_start, pa_end;
3522 if (type == IORESOURCE_IRQ) {
3523 r = _get_mpu_irq_by_name(oh, name, &irq);
3529 } else if (type == IORESOURCE_DMA) {
3530 r = _get_sdma_req_by_name(oh, name, &dma);
3536 } else if (type == IORESOURCE_MEM) {
3537 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3541 rsrc->start = pa_start;
3554 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3555 * @oh: struct omap_hwmod *
3557 * Return the powerdomain pointer associated with the OMAP module
3558 * @oh's main clock. If @oh does not have a main clk, return the
3559 * powerdomain associated with the interface clock associated with the
3560 * module's MPU port. (XXX Perhaps this should use the SDMA port
3561 * instead?) Returns NULL on error, or a struct powerdomain * on
3564 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3567 struct omap_hwmod_ocp_if *oi;
3568 struct clockdomain *clkdm;
3569 struct clk_hw_omap *clk;
3575 return oh->clkdm->pwrdm.ptr;
3580 oi = _find_mpu_rt_port(oh);
3586 clk = to_clk_hw_omap(__clk_get_hw(c));
3591 return clkdm->pwrdm.ptr;
3595 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3596 * @oh: struct omap_hwmod *
3598 * Returns the virtual address corresponding to the beginning of the
3599 * module's register target, in the address range that is intended to
3600 * be used by the MPU. Returns the virtual address upon success or NULL
3603 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3608 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3611 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3614 return oh->_mpu_rt_va;
3618 * XXX what about functions for drivers to save/restore ocp_sysconfig
3619 * for context save/restore operations?
3623 * omap_hwmod_enable_wakeup - allow device to wake up the system
3624 * @oh: struct omap_hwmod *
3626 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3627 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3628 * this IP block if it has dynamic mux entries. Eventually this
3629 * should set PRCM wakeup registers to cause the PRCM to receive
3630 * wakeup events from the module. Does not set any wakeup routing
3631 * registers beyond this point - if the module is to wake up any other
3632 * module or subsystem, that must be set separately. Called by
3633 * omap_device code. Returns -EINVAL on error or 0 upon success.
3635 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3637 unsigned long flags;
3640 spin_lock_irqsave(&oh->_lock, flags);
3642 if (oh->class->sysc &&
3643 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3644 v = oh->_sysc_cache;
3645 _enable_wakeup(oh, &v);
3646 _write_sysconfig(v, oh);
3649 _set_idle_ioring_wakeup(oh, true);
3650 spin_unlock_irqrestore(&oh->_lock, flags);
3656 * omap_hwmod_disable_wakeup - prevent device from waking the system
3657 * @oh: struct omap_hwmod *
3659 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3660 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3661 * events for this IP block if it has dynamic mux entries. Eventually
3662 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3663 * wakeup events from the module. Does not set any wakeup routing
3664 * registers beyond this point - if the module is to wake up any other
3665 * module or subsystem, that must be set separately. Called by
3666 * omap_device code. Returns -EINVAL on error or 0 upon success.
3668 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3670 unsigned long flags;
3673 spin_lock_irqsave(&oh->_lock, flags);
3675 if (oh->class->sysc &&
3676 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3677 v = oh->_sysc_cache;
3678 _disable_wakeup(oh, &v);
3679 _write_sysconfig(v, oh);
3682 _set_idle_ioring_wakeup(oh, false);
3683 spin_unlock_irqrestore(&oh->_lock, flags);
3689 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3690 * contained in the hwmod module.
3691 * @oh: struct omap_hwmod *
3692 * @name: name of the reset line to lookup and assert
3694 * Some IP like dsp, ipu or iva contain processor that require
3695 * an HW reset line to be assert / deassert in order to enable fully
3696 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3697 * yet supported on this OMAP; otherwise, passes along the return value
3698 * from _assert_hardreset().
3700 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3703 unsigned long flags;
3708 spin_lock_irqsave(&oh->_lock, flags);
3709 ret = _assert_hardreset(oh, name);
3710 spin_unlock_irqrestore(&oh->_lock, flags);
3716 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3717 * contained in the hwmod module.
3718 * @oh: struct omap_hwmod *
3719 * @name: name of the reset line to look up and deassert
3721 * Some IP like dsp, ipu or iva contain processor that require
3722 * an HW reset line to be assert / deassert in order to enable fully
3723 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3724 * yet supported on this OMAP; otherwise, passes along the return value
3725 * from _deassert_hardreset().
3727 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3730 unsigned long flags;
3735 spin_lock_irqsave(&oh->_lock, flags);
3736 ret = _deassert_hardreset(oh, name);
3737 spin_unlock_irqrestore(&oh->_lock, flags);
3743 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3744 * @classname: struct omap_hwmod_class name to search for
3745 * @fn: callback function pointer to call for each hwmod in class @classname
3746 * @user: arbitrary context data to pass to the callback function
3748 * For each omap_hwmod of class @classname, call @fn.
3749 * If the callback function returns something other than
3750 * zero, the iterator is terminated, and the callback function's return
3751 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3752 * if @classname or @fn are NULL, or passes back the error code from @fn.
3754 int omap_hwmod_for_each_by_class(const char *classname,
3755 int (*fn)(struct omap_hwmod *oh,
3759 struct omap_hwmod *temp_oh;
3762 if (!classname || !fn)
3765 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3766 __func__, classname);
3768 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3769 if (!strcmp(temp_oh->class->name, classname)) {
3770 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3771 __func__, temp_oh->name);
3772 ret = (*fn)(temp_oh, user);
3779 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3786 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3787 * @oh: struct omap_hwmod *
3788 * @state: state that _setup() should leave the hwmod in
3790 * Sets the hwmod state that @oh will enter at the end of _setup()
3791 * (called by omap_hwmod_setup_*()). See also the documentation
3792 * for _setup_postsetup(), above. Returns 0 upon success or
3793 * -EINVAL if there is a problem with the arguments or if the hwmod is
3794 * in the wrong state.
3796 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3799 unsigned long flags;
3804 if (state != _HWMOD_STATE_DISABLED &&
3805 state != _HWMOD_STATE_ENABLED &&
3806 state != _HWMOD_STATE_IDLE)
3809 spin_lock_irqsave(&oh->_lock, flags);
3811 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3816 oh->_postsetup_state = state;
3820 spin_unlock_irqrestore(&oh->_lock, flags);
3826 * omap_hwmod_get_context_loss_count - get lost context count
3827 * @oh: struct omap_hwmod *
3829 * Returns the context loss count of associated @oh
3830 * upon success, or zero if no context loss data is available.
3832 * On OMAP4, this queries the per-hwmod context loss register,
3833 * assuming one exists. If not, or on OMAP2/3, this queries the
3834 * enclosing powerdomain context loss count.
3836 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3838 struct powerdomain *pwrdm;
3841 if (soc_ops.get_context_lost)
3842 return soc_ops.get_context_lost(oh);
3844 pwrdm = omap_hwmod_get_pwrdm(oh);
3846 ret = pwrdm_get_context_loss_count(pwrdm);
3852 * omap_hwmod_init - initialize the hwmod code
3854 * Sets up some function pointers needed by the hwmod code to operate on the
3855 * currently-booted SoC. Intended to be called once during kernel init
3856 * before any hwmods are registered. No return value.
3858 void __init omap_hwmod_init(void)
3860 if (cpu_is_omap24xx()) {
3861 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3862 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3863 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3864 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3865 } else if (cpu_is_omap34xx()) {
3866 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3867 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3868 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3869 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3870 soc_ops.init_clkdm = _init_clkdm;
3871 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
3872 soc_ops.enable_module = _omap4_enable_module;
3873 soc_ops.disable_module = _omap4_disable_module;
3874 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3875 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3876 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
3877 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3878 soc_ops.init_clkdm = _init_clkdm;
3879 soc_ops.update_context_lost = _omap4_update_context_lost;
3880 soc_ops.get_context_lost = _omap4_get_context_lost;
3881 } else if (cpu_is_ti816x() || soc_is_am33xx() || soc_is_am43xx()) {
3882 soc_ops.enable_module = _omap4_enable_module;
3883 soc_ops.disable_module = _omap4_disable_module;
3884 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3885 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3886 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
3887 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3888 soc_ops.init_clkdm = _init_clkdm;
3890 WARN(1, "omap_hwmod: unknown SoC type\n");
3897 * omap_hwmod_get_main_clk - get pointer to main clock name
3898 * @oh: struct omap_hwmod *
3900 * Returns the main clock name assocated with @oh upon success,
3901 * or NULL if @oh is NULL.
3903 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
3908 return oh->main_clk;