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.h>
134 #include <linux/clk-provider.h>
135 #include <linux/delay.h>
136 #include <linux/err.h>
137 #include <linux/list.h>
138 #include <linux/mutex.h>
139 #include <linux/spinlock.h>
140 #include <linux/slab.h>
141 #include <linux/bootmem.h>
142 #include <linux/cpu.h>
143 #include <linux/of.h>
144 #include <linux/of_address.h>
146 #include <asm/system_misc.h>
149 #include "omap_hwmod.h"
153 #include "clockdomain.h"
154 #include "powerdomain.h"
162 #include "prminst44xx.h"
166 /* Name of the OMAP hwmod for the MPU */
167 #define MPU_INITIATOR_NAME "mpu"
170 * Number of struct omap_hwmod_link records per struct
171 * omap_hwmod_ocp_if record (master->slave and slave->master)
173 #define LINKS_PER_OCP_IF 2
176 * Address offset (in bytes) between the reset control and the reset
177 * status registers: 4 bytes on OMAP4
179 #define OMAP4_RST_CTRL_ST_OFFSET 4
182 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
183 * @enable_module: function to enable a module (via MODULEMODE)
184 * @disable_module: function to disable a module (via MODULEMODE)
186 * XXX Eventually this functionality will be hidden inside the PRM/CM
187 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
188 * conditionals in this code.
190 struct omap_hwmod_soc_ops {
191 void (*enable_module)(struct omap_hwmod *oh);
192 int (*disable_module)(struct omap_hwmod *oh);
193 int (*wait_target_ready)(struct omap_hwmod *oh);
194 int (*assert_hardreset)(struct omap_hwmod *oh,
195 struct omap_hwmod_rst_info *ohri);
196 int (*deassert_hardreset)(struct omap_hwmod *oh,
197 struct omap_hwmod_rst_info *ohri);
198 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
199 struct omap_hwmod_rst_info *ohri);
200 int (*init_clkdm)(struct omap_hwmod *oh);
201 void (*update_context_lost)(struct omap_hwmod *oh);
202 int (*get_context_lost)(struct omap_hwmod *oh);
205 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
206 static struct omap_hwmod_soc_ops soc_ops;
208 /* omap_hwmod_list contains all registered struct omap_hwmods */
209 static LIST_HEAD(omap_hwmod_list);
211 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
212 static struct omap_hwmod *mpu_oh;
214 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
215 static DEFINE_SPINLOCK(io_chain_lock);
218 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
219 * allocated from - used to reduce the number of small memory
220 * allocations, which has a significant impact on performance
222 static struct omap_hwmod_link *linkspace;
225 * free_ls, max_ls: array indexes into linkspace; representing the
226 * next free struct omap_hwmod_link index, and the maximum number of
227 * struct omap_hwmod_link records allocated (respectively)
229 static unsigned short free_ls, max_ls, ls_supp;
231 /* inited: set to true once the hwmod code is initialized */
234 /* Private functions */
237 * _fetch_next_ocp_if - return the next OCP interface in a list
238 * @p: ptr to a ptr to the list_head inside the ocp_if to return
239 * @i: pointer to the index of the element pointed to by @p in the list
241 * Return a pointer to the struct omap_hwmod_ocp_if record
242 * containing the struct list_head pointed to by @p, and increment
243 * @p such that a future call to this routine will return the next
246 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
249 struct omap_hwmod_ocp_if *oi;
251 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
260 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
261 * @oh: struct omap_hwmod *
263 * Load the current value of the hwmod OCP_SYSCONFIG register into the
264 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
265 * OCP_SYSCONFIG register or 0 upon success.
267 static int _update_sysc_cache(struct omap_hwmod *oh)
269 if (!oh->class->sysc) {
270 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
274 /* XXX ensure module interface clock is up */
276 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
278 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
279 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
285 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
286 * @v: OCP_SYSCONFIG value to write
287 * @oh: struct omap_hwmod *
289 * Write @v into the module class' OCP_SYSCONFIG register, if it has
290 * one. No return value.
292 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
294 if (!oh->class->sysc) {
295 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
299 /* XXX ensure module interface clock is up */
301 /* Module might have lost context, always update cache and register */
303 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
307 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
308 * @oh: struct omap_hwmod *
309 * @standbymode: MIDLEMODE field bits
310 * @v: pointer to register contents to modify
312 * Update the master standby mode bits in @v to be @standbymode for
313 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
314 * upon error or 0 upon success.
316 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
322 if (!oh->class->sysc ||
323 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
326 if (!oh->class->sysc->sysc_fields) {
327 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
331 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
332 mstandby_mask = (0x3 << mstandby_shift);
334 *v &= ~mstandby_mask;
335 *v |= __ffs(standbymode) << mstandby_shift;
341 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
342 * @oh: struct omap_hwmod *
343 * @idlemode: SIDLEMODE field bits
344 * @v: pointer to register contents to modify
346 * Update the slave idle mode bits in @v to be @idlemode for the @oh
347 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
350 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
355 if (!oh->class->sysc ||
356 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
359 if (!oh->class->sysc->sysc_fields) {
360 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
364 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
365 sidle_mask = (0x3 << sidle_shift);
368 *v |= __ffs(idlemode) << sidle_shift;
374 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
375 * @oh: struct omap_hwmod *
376 * @clockact: CLOCKACTIVITY field bits
377 * @v: pointer to register contents to modify
379 * Update the clockactivity mode bits in @v to be @clockact for the
380 * @oh hwmod. Used for additional powersaving on some modules. Does
381 * not write to the hardware. Returns -EINVAL upon error or 0 upon
384 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
389 if (!oh->class->sysc ||
390 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
393 if (!oh->class->sysc->sysc_fields) {
394 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
398 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
399 clkact_mask = (0x3 << clkact_shift);
402 *v |= clockact << clkact_shift;
408 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
409 * @oh: struct omap_hwmod *
410 * @v: pointer to register contents to modify
412 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
413 * error or 0 upon success.
415 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
419 if (!oh->class->sysc ||
420 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
423 if (!oh->class->sysc->sysc_fields) {
424 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
428 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
436 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
437 * @oh: struct omap_hwmod *
438 * @v: pointer to register contents to modify
440 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
441 * error or 0 upon success.
443 static int _clear_softreset(struct omap_hwmod *oh, u32 *v)
447 if (!oh->class->sysc ||
448 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
451 if (!oh->class->sysc->sysc_fields) {
453 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
458 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
466 * _wait_softreset_complete - wait for an OCP softreset to complete
467 * @oh: struct omap_hwmod * to wait on
469 * Wait until the IP block represented by @oh reports that its OCP
470 * softreset is complete. This can be triggered by software (see
471 * _ocp_softreset()) or by hardware upon returning from off-mode (one
472 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
473 * microseconds. Returns the number of microseconds waited.
475 static int _wait_softreset_complete(struct omap_hwmod *oh)
477 struct omap_hwmod_class_sysconfig *sysc;
481 sysc = oh->class->sysc;
483 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
484 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
485 & SYSS_RESETDONE_MASK),
486 MAX_MODULE_SOFTRESET_WAIT, c);
487 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
488 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
489 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
491 MAX_MODULE_SOFTRESET_WAIT, c);
498 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
499 * @oh: struct omap_hwmod *
501 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
502 * of some modules. When the DMA must perform read/write accesses, the
503 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
504 * for power management, software must set the DMADISABLE bit back to 1.
506 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
507 * error or 0 upon success.
509 static int _set_dmadisable(struct omap_hwmod *oh)
514 if (!oh->class->sysc ||
515 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
518 if (!oh->class->sysc->sysc_fields) {
519 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
523 /* clocks must be on for this operation */
524 if (oh->_state != _HWMOD_STATE_ENABLED) {
525 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
529 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
533 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
534 v |= dmadisable_mask;
535 _write_sysconfig(v, oh);
541 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
542 * @oh: struct omap_hwmod *
543 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
544 * @v: pointer to register contents to modify
546 * Update the module autoidle bit in @v to be @autoidle for the @oh
547 * hwmod. The autoidle bit controls whether the module can gate
548 * internal clocks automatically when it isn't doing anything; the
549 * exact function of this bit varies on a per-module basis. This
550 * function does not write to the hardware. Returns -EINVAL upon
551 * error or 0 upon success.
553 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
559 if (!oh->class->sysc ||
560 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
563 if (!oh->class->sysc->sysc_fields) {
564 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
568 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
569 autoidle_mask = (0x1 << autoidle_shift);
571 *v &= ~autoidle_mask;
572 *v |= autoidle << autoidle_shift;
578 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
579 * @oh: struct omap_hwmod *
580 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
582 * Set or clear the I/O pad wakeup flag in the mux entries for the
583 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
584 * in memory. If the hwmod is currently idled, and the new idle
585 * values don't match the previous ones, this function will also
586 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
587 * currently idled, this function won't touch the hardware: the new
588 * mux settings are written to the SCM PADCTRL registers when the
589 * hwmod is idled. No return value.
591 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
593 struct omap_device_pad *pad;
598 if (!oh->mux || !oh->mux->enabled)
601 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
602 pad = oh->mux->pads_dynamic[j];
604 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
607 prev_idle = pad->idle;
610 pad->idle |= OMAP_WAKEUP_EN;
612 pad->idle &= ~OMAP_WAKEUP_EN;
614 if (prev_idle != pad->idle)
618 if (change && oh->_state == _HWMOD_STATE_IDLE)
619 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
623 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
624 * @oh: struct omap_hwmod *
626 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
627 * upon error or 0 upon success.
629 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
631 if (!oh->class->sysc ||
632 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
633 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
634 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
637 if (!oh->class->sysc->sysc_fields) {
638 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
642 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
643 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
645 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
646 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
647 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
648 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
650 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
656 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
657 * @oh: struct omap_hwmod *
659 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
660 * upon error or 0 upon success.
662 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
664 if (!oh->class->sysc ||
665 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
666 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
667 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
670 if (!oh->class->sysc->sysc_fields) {
671 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
675 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
676 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
678 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
679 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
680 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
681 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
683 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
688 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
690 struct clk_hw_omap *clk;
694 } else if (oh->_clk) {
695 if (__clk_get_flags(oh->_clk) & CLK_IS_BASIC)
697 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
704 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
705 * @oh: struct omap_hwmod *
707 * Prevent the hardware module @oh from entering idle while the
708 * hardare module initiator @init_oh is active. Useful when a module
709 * will be accessed by a particular initiator (e.g., if a module will
710 * be accessed by the IVA, there should be a sleepdep between the IVA
711 * initiator and the module). Only applies to modules in smart-idle
712 * mode. If the clockdomain is marked as not needing autodeps, return
713 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
714 * passes along clkdm_add_sleepdep() value upon success.
716 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
718 struct clockdomain *clkdm, *init_clkdm;
720 clkdm = _get_clkdm(oh);
721 init_clkdm = _get_clkdm(init_oh);
723 if (!clkdm || !init_clkdm)
726 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
729 return clkdm_add_sleepdep(clkdm, init_clkdm);
733 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
734 * @oh: struct omap_hwmod *
736 * Allow the hardware module @oh to enter idle while the hardare
737 * module initiator @init_oh is active. Useful when a module will not
738 * be accessed by a particular initiator (e.g., if a module will not
739 * be accessed by the IVA, there should be no sleepdep between the IVA
740 * initiator and the module). Only applies to modules in smart-idle
741 * mode. If the clockdomain is marked as not needing autodeps, return
742 * 0 without doing anything. Returns -EINVAL upon error or passes
743 * along clkdm_del_sleepdep() value upon success.
745 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
747 struct clockdomain *clkdm, *init_clkdm;
749 clkdm = _get_clkdm(oh);
750 init_clkdm = _get_clkdm(init_oh);
752 if (!clkdm || !init_clkdm)
755 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
758 return clkdm_del_sleepdep(clkdm, init_clkdm);
762 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
763 * @oh: struct omap_hwmod *
765 * Called from _init_clocks(). Populates the @oh _clk (main
766 * functional clock pointer) if a main_clk is present. Returns 0 on
767 * success or -EINVAL on error.
769 static int _init_main_clk(struct omap_hwmod *oh)
776 oh->_clk = clk_get(NULL, oh->main_clk);
777 if (IS_ERR(oh->_clk)) {
778 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
779 oh->name, oh->main_clk);
783 * HACK: This needs a re-visit once clk_prepare() is implemented
784 * to do something meaningful. Today its just a no-op.
785 * If clk_prepare() is used at some point to do things like
786 * voltage scaling etc, then this would have to be moved to
787 * some point where subsystems like i2c and pmic become
790 clk_prepare(oh->_clk);
793 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
794 oh->name, oh->main_clk);
800 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
801 * @oh: struct omap_hwmod *
803 * Called from _init_clocks(). Populates the @oh OCP slave interface
804 * clock pointers. Returns 0 on success or -EINVAL on error.
806 static int _init_interface_clks(struct omap_hwmod *oh)
808 struct omap_hwmod_ocp_if *os;
814 p = oh->slave_ports.next;
816 while (i < oh->slaves_cnt) {
817 os = _fetch_next_ocp_if(&p, &i);
821 c = clk_get(NULL, os->clk);
823 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
830 * HACK: This needs a re-visit once clk_prepare() is implemented
831 * to do something meaningful. Today its just a no-op.
832 * If clk_prepare() is used at some point to do things like
833 * voltage scaling etc, then this would have to be moved to
834 * some point where subsystems like i2c and pmic become
837 clk_prepare(os->_clk);
844 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
845 * @oh: struct omap_hwmod *
847 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
848 * clock pointers. Returns 0 on success or -EINVAL on error.
850 static int _init_opt_clks(struct omap_hwmod *oh)
852 struct omap_hwmod_opt_clk *oc;
857 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
858 c = clk_get(NULL, oc->clk);
860 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
867 * HACK: This needs a re-visit once clk_prepare() is implemented
868 * to do something meaningful. Today its just a no-op.
869 * If clk_prepare() is used at some point to do things like
870 * voltage scaling etc, then this would have to be moved to
871 * some point where subsystems like i2c and pmic become
874 clk_prepare(oc->_clk);
881 * _enable_clocks - enable hwmod main clock and interface clocks
882 * @oh: struct omap_hwmod *
884 * Enables all clocks necessary for register reads and writes to succeed
885 * on the hwmod @oh. Returns 0.
887 static int _enable_clocks(struct omap_hwmod *oh)
889 struct omap_hwmod_ocp_if *os;
893 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
896 clk_enable(oh->_clk);
898 p = oh->slave_ports.next;
900 while (i < oh->slaves_cnt) {
901 os = _fetch_next_ocp_if(&p, &i);
903 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
904 clk_enable(os->_clk);
907 /* The opt clocks are controlled by the device driver. */
913 * _disable_clocks - disable hwmod main clock and interface clocks
914 * @oh: struct omap_hwmod *
916 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
918 static int _disable_clocks(struct omap_hwmod *oh)
920 struct omap_hwmod_ocp_if *os;
924 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
927 clk_disable(oh->_clk);
929 p = oh->slave_ports.next;
931 while (i < oh->slaves_cnt) {
932 os = _fetch_next_ocp_if(&p, &i);
934 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
935 clk_disable(os->_clk);
938 /* The opt clocks are controlled by the device driver. */
943 static void _enable_optional_clocks(struct omap_hwmod *oh)
945 struct omap_hwmod_opt_clk *oc;
948 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
950 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
952 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
953 __clk_get_name(oc->_clk));
954 clk_enable(oc->_clk);
958 static void _disable_optional_clocks(struct omap_hwmod *oh)
960 struct omap_hwmod_opt_clk *oc;
963 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
965 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
967 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
968 __clk_get_name(oc->_clk));
969 clk_disable(oc->_clk);
974 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
975 * @oh: struct omap_hwmod *
977 * Enables the PRCM module mode related to the hwmod @oh.
980 static void _omap4_enable_module(struct omap_hwmod *oh)
982 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
985 pr_debug("omap_hwmod: %s: %s: %d\n",
986 oh->name, __func__, oh->prcm.omap4.modulemode);
988 omap_cm_module_enable(oh->prcm.omap4.modulemode,
989 oh->clkdm->prcm_partition,
990 oh->clkdm->cm_inst, oh->prcm.omap4.clkctrl_offs);
994 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
995 * @oh: struct omap_hwmod *
997 * Wait for a module @oh to enter slave idle. Returns 0 if the module
998 * does not have an IDLEST bit or if the module successfully enters
999 * slave idle; otherwise, pass along the return value of the
1000 * appropriate *_cm*_wait_module_idle() function.
1002 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
1007 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
1010 if (oh->flags & HWMOD_NO_IDLEST)
1013 return omap_cm_wait_module_idle(oh->clkdm->prcm_partition,
1015 oh->prcm.omap4.clkctrl_offs, 0);
1019 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1020 * @oh: struct omap_hwmod *oh
1022 * Count and return the number of MPU IRQs associated with the hwmod
1023 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1026 static int _count_mpu_irqs(struct omap_hwmod *oh)
1028 struct omap_hwmod_irq_info *ohii;
1031 if (!oh || !oh->mpu_irqs)
1035 ohii = &oh->mpu_irqs[i++];
1036 } while (ohii->irq != -1);
1042 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1043 * @oh: struct omap_hwmod *oh
1045 * Count and return the number of SDMA request lines associated with
1046 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1049 static int _count_sdma_reqs(struct omap_hwmod *oh)
1051 struct omap_hwmod_dma_info *ohdi;
1054 if (!oh || !oh->sdma_reqs)
1058 ohdi = &oh->sdma_reqs[i++];
1059 } while (ohdi->dma_req != -1);
1065 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1066 * @oh: struct omap_hwmod *oh
1068 * Count and return the number of address space ranges associated with
1069 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1072 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1074 struct omap_hwmod_addr_space *mem;
1077 if (!os || !os->addr)
1081 mem = &os->addr[i++];
1082 } while (mem->pa_start != mem->pa_end);
1088 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1089 * @oh: struct omap_hwmod * to operate on
1090 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1091 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1093 * Retrieve a MPU hardware IRQ line number named by @name associated
1094 * with the IP block pointed to by @oh. The IRQ number will be filled
1095 * into the address pointed to by @dma. When @name is non-null, the
1096 * IRQ line number associated with the named entry will be returned.
1097 * If @name is null, the first matching entry will be returned. Data
1098 * order is not meaningful in hwmod data, so callers are strongly
1099 * encouraged to use a non-null @name whenever possible to avoid
1100 * unpredictable effects if hwmod data is later added that causes data
1101 * ordering to change. Returns 0 upon success or a negative error
1104 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1114 while (oh->mpu_irqs[i].irq != -1) {
1115 if (name == oh->mpu_irqs[i].name ||
1116 !strcmp(name, oh->mpu_irqs[i].name)) {
1126 *irq = oh->mpu_irqs[i].irq;
1132 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1133 * @oh: struct omap_hwmod * to operate on
1134 * @name: pointer to the name of the SDMA request line to fetch (optional)
1135 * @dma: pointer to an unsigned int to store the request line ID to
1137 * Retrieve an SDMA request line ID named by @name on the IP block
1138 * pointed to by @oh. The ID will be filled into the address pointed
1139 * to by @dma. When @name is non-null, the request line ID associated
1140 * with the named entry will be returned. If @name is null, the first
1141 * matching entry will be returned. Data order is not meaningful in
1142 * hwmod data, so callers are strongly encouraged to use a non-null
1143 * @name whenever possible to avoid unpredictable effects if hwmod
1144 * data is later added that causes data ordering to change. Returns 0
1145 * upon success or a negative error code upon error.
1147 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1157 while (oh->sdma_reqs[i].dma_req != -1) {
1158 if (name == oh->sdma_reqs[i].name ||
1159 !strcmp(name, oh->sdma_reqs[i].name)) {
1169 *dma = oh->sdma_reqs[i].dma_req;
1175 * _get_addr_space_by_name - fetch address space start & end by name
1176 * @oh: struct omap_hwmod * to operate on
1177 * @name: pointer to the name of the address space to fetch (optional)
1178 * @pa_start: pointer to a u32 to store the starting address to
1179 * @pa_end: pointer to a u32 to store the ending address to
1181 * Retrieve address space start and end addresses for the IP block
1182 * pointed to by @oh. The data will be filled into the addresses
1183 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1184 * address space data associated with the named entry will be
1185 * returned. If @name is null, the first matching entry will be
1186 * returned. Data order is not meaningful in hwmod data, so callers
1187 * are strongly encouraged to use a non-null @name whenever possible
1188 * to avoid unpredictable effects if hwmod data is later added that
1189 * causes data ordering to change. Returns 0 upon success or a
1190 * negative error code upon error.
1192 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1193 u32 *pa_start, u32 *pa_end)
1196 struct omap_hwmod_ocp_if *os;
1197 struct list_head *p = NULL;
1200 p = oh->slave_ports.next;
1203 while (i < oh->slaves_cnt) {
1204 os = _fetch_next_ocp_if(&p, &i);
1210 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1211 if (name == os->addr[j].name ||
1212 !strcmp(name, os->addr[j].name)) {
1226 *pa_start = os->addr[j].pa_start;
1227 *pa_end = os->addr[j].pa_end;
1233 * _save_mpu_port_index - find and save the index to @oh's MPU port
1234 * @oh: struct omap_hwmod *
1236 * Determines the array index of the OCP slave port that the MPU uses
1237 * to address the device, and saves it into the struct omap_hwmod.
1238 * Intended to be called during hwmod registration only. No return
1241 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1243 struct omap_hwmod_ocp_if *os = NULL;
1244 struct list_head *p;
1250 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1252 p = oh->slave_ports.next;
1254 while (i < oh->slaves_cnt) {
1255 os = _fetch_next_ocp_if(&p, &i);
1256 if (os->user & OCP_USER_MPU) {
1258 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1267 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1268 * @oh: struct omap_hwmod *
1270 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1271 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1272 * communicate with the IP block. This interface need not be directly
1273 * connected to the MPU (and almost certainly is not), but is directly
1274 * connected to the IP block represented by @oh. Returns a pointer
1275 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1276 * error or if there does not appear to be a path from the MPU to this
1279 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1281 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1284 return oh->_mpu_port;
1288 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1289 * @oh: struct omap_hwmod *
1291 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1292 * the register target MPU address space; or returns NULL upon error.
1294 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1296 struct omap_hwmod_ocp_if *os;
1297 struct omap_hwmod_addr_space *mem;
1298 int found = 0, i = 0;
1300 os = _find_mpu_rt_port(oh);
1301 if (!os || !os->addr)
1305 mem = &os->addr[i++];
1306 if (mem->flags & ADDR_TYPE_RT)
1308 } while (!found && mem->pa_start != mem->pa_end);
1310 return (found) ? mem : NULL;
1314 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1315 * @oh: struct omap_hwmod *
1317 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1318 * by @oh is set to indicate to the PRCM that the IP block is active.
1319 * Usually this means placing the module into smart-idle mode and
1320 * smart-standby, but if there is a bug in the automatic idle handling
1321 * for the IP block, it may need to be placed into the force-idle or
1322 * no-idle variants of these modes. No return value.
1324 static void _enable_sysc(struct omap_hwmod *oh)
1329 struct clockdomain *clkdm;
1331 if (!oh->class->sysc)
1335 * Wait until reset has completed, this is needed as the IP
1336 * block is reset automatically by hardware in some cases
1337 * (off-mode for example), and the drivers require the
1338 * IP to be ready when they access it
1340 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1341 _enable_optional_clocks(oh);
1342 _wait_softreset_complete(oh);
1343 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1344 _disable_optional_clocks(oh);
1346 v = oh->_sysc_cache;
1347 sf = oh->class->sysc->sysc_flags;
1349 clkdm = _get_clkdm(oh);
1350 if (sf & SYSC_HAS_SIDLEMODE) {
1351 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1352 oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
1353 idlemode = HWMOD_IDLEMODE_NO;
1355 if (sf & SYSC_HAS_ENAWAKEUP)
1356 _enable_wakeup(oh, &v);
1357 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1358 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1360 idlemode = HWMOD_IDLEMODE_SMART;
1364 * This is special handling for some IPs like
1365 * 32k sync timer. Force them to idle!
1367 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1368 if (clkdm_act && !(oh->class->sysc->idlemodes &
1369 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1370 idlemode = HWMOD_IDLEMODE_FORCE;
1372 _set_slave_idlemode(oh, idlemode, &v);
1375 if (sf & SYSC_HAS_MIDLEMODE) {
1376 if (oh->flags & HWMOD_FORCE_MSTANDBY) {
1377 idlemode = HWMOD_IDLEMODE_FORCE;
1378 } else if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1379 idlemode = HWMOD_IDLEMODE_NO;
1381 if (sf & SYSC_HAS_ENAWAKEUP)
1382 _enable_wakeup(oh, &v);
1383 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1384 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1386 idlemode = HWMOD_IDLEMODE_SMART;
1388 _set_master_standbymode(oh, idlemode, &v);
1392 * XXX The clock framework should handle this, by
1393 * calling into this code. But this must wait until the
1394 * clock structures are tagged with omap_hwmod entries
1396 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1397 (sf & SYSC_HAS_CLOCKACTIVITY))
1398 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1400 /* If the cached value is the same as the new value, skip the write */
1401 if (oh->_sysc_cache != v)
1402 _write_sysconfig(v, oh);
1405 * Set the autoidle bit only after setting the smartidle bit
1406 * Setting this will not have any impact on the other modules.
1408 if (sf & SYSC_HAS_AUTOIDLE) {
1409 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1411 _set_module_autoidle(oh, idlemode, &v);
1412 _write_sysconfig(v, oh);
1417 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1418 * @oh: struct omap_hwmod *
1420 * If module is marked as SWSUP_SIDLE, force the module into slave
1421 * idle; otherwise, configure it for smart-idle. If module is marked
1422 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1423 * configure it for smart-standby. No return value.
1425 static void _idle_sysc(struct omap_hwmod *oh)
1430 if (!oh->class->sysc)
1433 v = oh->_sysc_cache;
1434 sf = oh->class->sysc->sysc_flags;
1436 if (sf & SYSC_HAS_SIDLEMODE) {
1437 if (oh->flags & HWMOD_SWSUP_SIDLE) {
1438 idlemode = HWMOD_IDLEMODE_FORCE;
1440 if (sf & SYSC_HAS_ENAWAKEUP)
1441 _enable_wakeup(oh, &v);
1442 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
1443 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1445 idlemode = HWMOD_IDLEMODE_SMART;
1447 _set_slave_idlemode(oh, idlemode, &v);
1450 if (sf & SYSC_HAS_MIDLEMODE) {
1451 if ((oh->flags & HWMOD_SWSUP_MSTANDBY) ||
1452 (oh->flags & HWMOD_FORCE_MSTANDBY)) {
1453 idlemode = HWMOD_IDLEMODE_FORCE;
1455 if (sf & SYSC_HAS_ENAWAKEUP)
1456 _enable_wakeup(oh, &v);
1457 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1458 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1460 idlemode = HWMOD_IDLEMODE_SMART;
1462 _set_master_standbymode(oh, idlemode, &v);
1465 _write_sysconfig(v, oh);
1469 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1470 * @oh: struct omap_hwmod *
1472 * Force the module into slave idle and master suspend. No return
1475 static void _shutdown_sysc(struct omap_hwmod *oh)
1480 if (!oh->class->sysc)
1483 v = oh->_sysc_cache;
1484 sf = oh->class->sysc->sysc_flags;
1486 if (sf & SYSC_HAS_SIDLEMODE)
1487 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1489 if (sf & SYSC_HAS_MIDLEMODE)
1490 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1492 if (sf & SYSC_HAS_AUTOIDLE)
1493 _set_module_autoidle(oh, 1, &v);
1495 _write_sysconfig(v, oh);
1499 * _lookup - find an omap_hwmod by name
1500 * @name: find an omap_hwmod by name
1502 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1504 static struct omap_hwmod *_lookup(const char *name)
1506 struct omap_hwmod *oh, *temp_oh;
1510 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1511 if (!strcmp(name, temp_oh->name)) {
1521 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1522 * @oh: struct omap_hwmod *
1524 * Convert a clockdomain name stored in a struct omap_hwmod into a
1525 * clockdomain pointer, and save it into the struct omap_hwmod.
1526 * Return -EINVAL if the clkdm_name lookup failed.
1528 static int _init_clkdm(struct omap_hwmod *oh)
1530 if (!oh->clkdm_name) {
1531 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1535 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1537 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1538 oh->name, oh->clkdm_name);
1542 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1543 oh->name, oh->clkdm_name);
1549 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1550 * well the clockdomain.
1551 * @oh: struct omap_hwmod *
1552 * @data: not used; pass NULL
1554 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1555 * Resolves all clock names embedded in the hwmod. Returns 0 on
1556 * success, or a negative error code on failure.
1558 static int _init_clocks(struct omap_hwmod *oh, void *data)
1562 if (oh->_state != _HWMOD_STATE_REGISTERED)
1565 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1567 if (soc_ops.init_clkdm)
1568 ret |= soc_ops.init_clkdm(oh);
1570 ret |= _init_main_clk(oh);
1571 ret |= _init_interface_clks(oh);
1572 ret |= _init_opt_clks(oh);
1575 oh->_state = _HWMOD_STATE_CLKS_INITED;
1577 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1583 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1584 * @oh: struct omap_hwmod *
1585 * @name: name of the reset line in the context of this hwmod
1586 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1588 * Return the bit position of the reset line that match the
1589 * input name. Return -ENOENT if not found.
1591 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1592 struct omap_hwmod_rst_info *ohri)
1596 for (i = 0; i < oh->rst_lines_cnt; i++) {
1597 const char *rst_line = oh->rst_lines[i].name;
1598 if (!strcmp(rst_line, name)) {
1599 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1600 ohri->st_shift = oh->rst_lines[i].st_shift;
1601 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1602 oh->name, __func__, rst_line, ohri->rst_shift,
1613 * _assert_hardreset - assert the HW reset line of submodules
1614 * contained in the hwmod module.
1615 * @oh: struct omap_hwmod *
1616 * @name: name of the reset line to lookup and assert
1618 * Some IP like dsp, ipu or iva contain processor that require an HW
1619 * reset line to be assert / deassert in order to enable fully the IP.
1620 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1621 * asserting the hardreset line on the currently-booted SoC, or passes
1622 * along the return value from _lookup_hardreset() or the SoC's
1623 * assert_hardreset code.
1625 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1627 struct omap_hwmod_rst_info ohri;
1633 if (!soc_ops.assert_hardreset)
1636 ret = _lookup_hardreset(oh, name, &ohri);
1640 ret = soc_ops.assert_hardreset(oh, &ohri);
1646 * _deassert_hardreset - deassert the HW reset line of submodules contained
1647 * in the hwmod module.
1648 * @oh: struct omap_hwmod *
1649 * @name: name of the reset line to look up and deassert
1651 * Some IP like dsp, ipu or iva contain processor that require an HW
1652 * reset line to be assert / deassert in order to enable fully the IP.
1653 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1654 * deasserting the hardreset line on the currently-booted SoC, or passes
1655 * along the return value from _lookup_hardreset() or the SoC's
1656 * deassert_hardreset code.
1658 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1660 struct omap_hwmod_rst_info ohri;
1667 if (!soc_ops.deassert_hardreset)
1670 ret = _lookup_hardreset(oh, name, &ohri);
1676 * A clockdomain must be in SW_SUP otherwise reset
1677 * might not be completed. The clockdomain can be set
1678 * in HW_AUTO only when the module become ready.
1680 hwsup = clkdm_in_hwsup(oh->clkdm);
1681 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1683 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1684 oh->name, oh->clkdm->name, ret);
1690 if (soc_ops.enable_module)
1691 soc_ops.enable_module(oh);
1693 ret = soc_ops.deassert_hardreset(oh, &ohri);
1695 if (soc_ops.disable_module)
1696 soc_ops.disable_module(oh);
1697 _disable_clocks(oh);
1700 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh->name);
1704 * Set the clockdomain to HW_AUTO, assuming that the
1705 * previous state was HW_AUTO.
1708 clkdm_allow_idle(oh->clkdm);
1710 clkdm_hwmod_disable(oh->clkdm, oh);
1717 * _read_hardreset - read the HW reset line state of submodules
1718 * contained in the hwmod module
1719 * @oh: struct omap_hwmod *
1720 * @name: name of the reset line to look up and read
1722 * Return the state of the reset line. Returns -EINVAL if @oh is
1723 * null, -ENOSYS if we have no way of reading the hardreset line
1724 * status on the currently-booted SoC, or passes along the return
1725 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1728 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1730 struct omap_hwmod_rst_info ohri;
1736 if (!soc_ops.is_hardreset_asserted)
1739 ret = _lookup_hardreset(oh, name, &ohri);
1743 return soc_ops.is_hardreset_asserted(oh, &ohri);
1747 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1748 * @oh: struct omap_hwmod *
1750 * If all hardreset lines associated with @oh are asserted, then return true.
1751 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1752 * associated with @oh are asserted, then return false.
1753 * This function is used to avoid executing some parts of the IP block
1754 * enable/disable sequence if its hardreset line is set.
1756 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1760 if (oh->rst_lines_cnt == 0)
1763 for (i = 0; i < oh->rst_lines_cnt; i++)
1764 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1767 if (oh->rst_lines_cnt == rst_cnt)
1774 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1776 * @oh: struct omap_hwmod *
1778 * If any hardreset lines associated with @oh are asserted, then
1779 * return true. Otherwise, if no hardreset lines associated with @oh
1780 * are asserted, or if @oh has no hardreset lines, then return false.
1781 * This function is used to avoid executing some parts of the IP block
1782 * enable/disable sequence if any hardreset line is set.
1784 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1789 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1790 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1793 return (rst_cnt) ? true : false;
1797 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1798 * @oh: struct omap_hwmod *
1800 * Disable the PRCM module mode related to the hwmod @oh.
1801 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1803 static int _omap4_disable_module(struct omap_hwmod *oh)
1807 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1811 * Since integration code might still be doing something, only
1812 * disable if all lines are under hardreset.
1814 if (_are_any_hardreset_lines_asserted(oh))
1817 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1819 omap_cm_module_disable(oh->clkdm->prcm_partition, oh->clkdm->cm_inst,
1820 oh->prcm.omap4.clkctrl_offs);
1822 v = _omap4_wait_target_disable(oh);
1824 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1831 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1832 * @oh: struct omap_hwmod *
1834 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1835 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1836 * reset this way, -EINVAL if the hwmod is in the wrong state,
1837 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1839 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1840 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1841 * use the SYSCONFIG softreset bit to provide the status.
1843 * Note that some IP like McBSP do have reset control but don't have
1846 static int _ocp_softreset(struct omap_hwmod *oh)
1852 if (!oh->class->sysc ||
1853 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1856 /* clocks must be on for this operation */
1857 if (oh->_state != _HWMOD_STATE_ENABLED) {
1858 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1863 /* For some modules, all optionnal clocks need to be enabled as well */
1864 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1865 _enable_optional_clocks(oh);
1867 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1869 v = oh->_sysc_cache;
1870 ret = _set_softreset(oh, &v);
1874 _write_sysconfig(v, oh);
1876 if (oh->class->sysc->srst_udelay)
1877 udelay(oh->class->sysc->srst_udelay);
1879 c = _wait_softreset_complete(oh);
1880 if (c == MAX_MODULE_SOFTRESET_WAIT) {
1881 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1882 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1886 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1889 ret = _clear_softreset(oh, &v);
1893 _write_sysconfig(v, oh);
1896 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1897 * _wait_target_ready() or _reset()
1901 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1902 _disable_optional_clocks(oh);
1908 * _reset - reset an omap_hwmod
1909 * @oh: struct omap_hwmod *
1911 * Resets an omap_hwmod @oh. If the module has a custom reset
1912 * function pointer defined, then call it to reset the IP block, and
1913 * pass along its return value to the caller. Otherwise, if the IP
1914 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1915 * associated with it, call a function to reset the IP block via that
1916 * method, and pass along the return value to the caller. Finally, if
1917 * the IP block has some hardreset lines associated with it, assert
1918 * all of those, but do _not_ deassert them. (This is because driver
1919 * authors have expressed an apparent requirement to control the
1920 * deassertion of the hardreset lines themselves.)
1922 * The default software reset mechanism for most OMAP IP blocks is
1923 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1924 * hwmods cannot be reset via this method. Some are not targets and
1925 * therefore have no OCP header registers to access. Others (like the
1926 * IVA) have idiosyncratic reset sequences. So for these relatively
1927 * rare cases, custom reset code can be supplied in the struct
1928 * omap_hwmod_class .reset function pointer.
1930 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1931 * does not prevent idling of the system. This is necessary for cases
1932 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1933 * kernel without disabling dma.
1935 * Passes along the return value from either _ocp_softreset() or the
1936 * custom reset function - these must return -EINVAL if the hwmod
1937 * cannot be reset this way or if the hwmod is in the wrong state,
1938 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1940 static int _reset(struct omap_hwmod *oh)
1944 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1946 if (oh->class->reset) {
1947 r = oh->class->reset(oh);
1949 if (oh->rst_lines_cnt > 0) {
1950 for (i = 0; i < oh->rst_lines_cnt; i++)
1951 _assert_hardreset(oh, oh->rst_lines[i].name);
1954 r = _ocp_softreset(oh);
1960 _set_dmadisable(oh);
1963 * OCP_SYSCONFIG bits need to be reprogrammed after a
1964 * softreset. The _enable() function should be split to avoid
1965 * the rewrite of the OCP_SYSCONFIG register.
1967 if (oh->class->sysc) {
1968 _update_sysc_cache(oh);
1976 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1978 * Call the appropriate PRM function to clear any logged I/O chain
1979 * wakeups and to reconfigure the chain. This apparently needs to be
1980 * done upon every mux change. Since hwmods can be concurrently
1981 * enabled and idled, hold a spinlock around the I/O chain
1982 * reconfiguration sequence. No return value.
1984 * XXX When the PRM code is moved to drivers, this function can be removed,
1985 * as the PRM infrastructure should abstract this.
1987 static void _reconfigure_io_chain(void)
1989 unsigned long flags;
1991 spin_lock_irqsave(&io_chain_lock, flags);
1993 omap_prm_reconfigure_io_chain();
1995 spin_unlock_irqrestore(&io_chain_lock, flags);
1999 * _omap4_update_context_lost - increment hwmod context loss counter if
2000 * hwmod context was lost, and clear hardware context loss reg
2001 * @oh: hwmod to check for context loss
2003 * If the PRCM indicates that the hwmod @oh lost context, increment
2004 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2005 * bits. No return value.
2007 static void _omap4_update_context_lost(struct omap_hwmod *oh)
2009 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
2012 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2013 oh->clkdm->pwrdm.ptr->prcm_offs,
2014 oh->prcm.omap4.context_offs))
2017 oh->prcm.omap4.context_lost_counter++;
2018 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2019 oh->clkdm->pwrdm.ptr->prcm_offs,
2020 oh->prcm.omap4.context_offs);
2024 * _omap4_get_context_lost - get context loss counter for a hwmod
2025 * @oh: hwmod to get context loss counter for
2027 * Returns the in-memory context loss counter for a hwmod.
2029 static int _omap4_get_context_lost(struct omap_hwmod *oh)
2031 return oh->prcm.omap4.context_lost_counter;
2035 * _enable_preprogram - Pre-program an IP block during the _enable() process
2036 * @oh: struct omap_hwmod *
2038 * Some IP blocks (such as AESS) require some additional programming
2039 * after enable before they can enter idle. If a function pointer to
2040 * do so is present in the hwmod data, then call it and pass along the
2041 * return value; otherwise, return 0.
2043 static int _enable_preprogram(struct omap_hwmod *oh)
2045 if (!oh->class->enable_preprogram)
2048 return oh->class->enable_preprogram(oh);
2052 * _enable - enable an omap_hwmod
2053 * @oh: struct omap_hwmod *
2055 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2056 * register target. Returns -EINVAL if the hwmod is in the wrong
2057 * state or passes along the return value of _wait_target_ready().
2059 static int _enable(struct omap_hwmod *oh)
2064 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2067 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2068 * state at init. Now that someone is really trying to enable
2069 * them, just ensure that the hwmod mux is set.
2071 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2073 * If the caller has mux data populated, do the mux'ing
2074 * which wouldn't have been done as part of the _enable()
2075 * done during setup.
2078 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2080 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2084 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2085 oh->_state != _HWMOD_STATE_IDLE &&
2086 oh->_state != _HWMOD_STATE_DISABLED) {
2087 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2093 * If an IP block contains HW reset lines and all of them are
2094 * asserted, we let integration code associated with that
2095 * block handle the enable. We've received very little
2096 * information on what those driver authors need, and until
2097 * detailed information is provided and the driver code is
2098 * posted to the public lists, this is probably the best we
2101 if (_are_all_hardreset_lines_asserted(oh))
2104 /* Mux pins for device runtime if populated */
2105 if (oh->mux && (!oh->mux->enabled ||
2106 ((oh->_state == _HWMOD_STATE_IDLE) &&
2107 oh->mux->pads_dynamic))) {
2108 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2109 _reconfigure_io_chain();
2110 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) {
2111 _reconfigure_io_chain();
2114 _add_initiator_dep(oh, mpu_oh);
2118 * A clockdomain must be in SW_SUP before enabling
2119 * completely the module. The clockdomain can be set
2120 * in HW_AUTO only when the module become ready.
2122 hwsup = clkdm_in_hwsup(oh->clkdm) &&
2123 !clkdm_missing_idle_reporting(oh->clkdm);
2124 r = clkdm_hwmod_enable(oh->clkdm, oh);
2126 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2127 oh->name, oh->clkdm->name, r);
2133 if (soc_ops.enable_module)
2134 soc_ops.enable_module(oh);
2135 if (oh->flags & HWMOD_BLOCK_WFI)
2136 cpu_idle_poll_ctrl(true);
2138 if (soc_ops.update_context_lost)
2139 soc_ops.update_context_lost(oh);
2141 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2145 * Set the clockdomain to HW_AUTO only if the target is ready,
2146 * assuming that the previous state was HW_AUTO
2148 if (oh->clkdm && hwsup)
2149 clkdm_allow_idle(oh->clkdm);
2151 oh->_state = _HWMOD_STATE_ENABLED;
2153 /* Access the sysconfig only if the target is ready */
2154 if (oh->class->sysc) {
2155 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2156 _update_sysc_cache(oh);
2159 r = _enable_preprogram(oh);
2161 if (soc_ops.disable_module)
2162 soc_ops.disable_module(oh);
2163 _disable_clocks(oh);
2164 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
2168 clkdm_hwmod_disable(oh->clkdm, oh);
2175 * _idle - idle an omap_hwmod
2176 * @oh: struct omap_hwmod *
2178 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2179 * no further work. Returns -EINVAL if the hwmod is in the wrong
2180 * state or returns 0.
2182 static int _idle(struct omap_hwmod *oh)
2184 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2186 if (oh->_state != _HWMOD_STATE_ENABLED) {
2187 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2192 if (_are_all_hardreset_lines_asserted(oh))
2195 if (oh->class->sysc)
2197 _del_initiator_dep(oh, mpu_oh);
2199 if (oh->flags & HWMOD_BLOCK_WFI)
2200 cpu_idle_poll_ctrl(false);
2201 if (soc_ops.disable_module)
2202 soc_ops.disable_module(oh);
2205 * The module must be in idle mode before disabling any parents
2206 * clocks. Otherwise, the parent clock might be disabled before
2207 * the module transition is done, and thus will prevent the
2208 * transition to complete properly.
2210 _disable_clocks(oh);
2212 clkdm_hwmod_disable(oh->clkdm, oh);
2214 /* Mux pins for device idle if populated */
2215 if (oh->mux && oh->mux->pads_dynamic) {
2216 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2217 _reconfigure_io_chain();
2218 } else if (oh->flags & HWMOD_RECONFIG_IO_CHAIN) {
2219 _reconfigure_io_chain();
2222 oh->_state = _HWMOD_STATE_IDLE;
2228 * _shutdown - shutdown an omap_hwmod
2229 * @oh: struct omap_hwmod *
2231 * Shut down an omap_hwmod @oh. This should be called when the driver
2232 * used for the hwmod is removed or unloaded or if the driver is not
2233 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2234 * state or returns 0.
2236 static int _shutdown(struct omap_hwmod *oh)
2241 if (oh->_state != _HWMOD_STATE_IDLE &&
2242 oh->_state != _HWMOD_STATE_ENABLED) {
2243 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2248 if (_are_all_hardreset_lines_asserted(oh))
2251 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2253 if (oh->class->pre_shutdown) {
2254 prev_state = oh->_state;
2255 if (oh->_state == _HWMOD_STATE_IDLE)
2257 ret = oh->class->pre_shutdown(oh);
2259 if (prev_state == _HWMOD_STATE_IDLE)
2265 if (oh->class->sysc) {
2266 if (oh->_state == _HWMOD_STATE_IDLE)
2271 /* clocks and deps are already disabled in idle */
2272 if (oh->_state == _HWMOD_STATE_ENABLED) {
2273 _del_initiator_dep(oh, mpu_oh);
2274 /* XXX what about the other system initiators here? dma, dsp */
2275 if (oh->flags & HWMOD_BLOCK_WFI)
2276 cpu_idle_poll_ctrl(false);
2277 if (soc_ops.disable_module)
2278 soc_ops.disable_module(oh);
2279 _disable_clocks(oh);
2281 clkdm_hwmod_disable(oh->clkdm, oh);
2283 /* XXX Should this code also force-disable the optional clocks? */
2285 for (i = 0; i < oh->rst_lines_cnt; i++)
2286 _assert_hardreset(oh, oh->rst_lines[i].name);
2288 /* Mux pins to safe mode or use populated off mode values */
2290 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2292 oh->_state = _HWMOD_STATE_DISABLED;
2297 static int of_dev_find_hwmod(struct device_node *np,
2298 struct omap_hwmod *oh)
2303 count = of_property_count_strings(np, "ti,hwmods");
2307 for (i = 0; i < count; i++) {
2308 res = of_property_read_string_index(np, "ti,hwmods",
2312 if (!strcmp(p, oh->name)) {
2313 pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n",
2314 np->name, i, oh->name);
2323 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2324 * @np: struct device_node *
2325 * @oh: struct omap_hwmod *
2326 * @index: index of the entry found
2327 * @found: struct device_node * found or NULL
2329 * Parse the dt blob and find out needed hwmod. Recursive function is
2330 * implemented to take care hierarchical dt blob parsing.
2331 * Return: Returns 0 on success, -ENODEV when not found.
2333 static int of_dev_hwmod_lookup(struct device_node *np,
2334 struct omap_hwmod *oh,
2336 struct device_node **found)
2338 struct device_node *np0 = NULL;
2341 res = of_dev_find_hwmod(np, oh);
2348 for_each_child_of_node(np, np0) {
2349 struct device_node *fc;
2352 res = of_dev_hwmod_lookup(np0, oh, &i, &fc);
2367 * _init_mpu_rt_base - populate the virtual address for a hwmod
2368 * @oh: struct omap_hwmod * to locate the virtual address
2369 * @data: (unused, caller should pass NULL)
2370 * @index: index of the reg entry iospace in device tree
2371 * @np: struct device_node * of the IP block's device node in the DT data
2373 * Cache the virtual address used by the MPU to access this IP block's
2374 * registers. This address is needed early so the OCP registers that
2375 * are part of the device's address space can be ioremapped properly.
2377 * If SYSC access is not needed, the registers will not be remapped
2378 * and non-availability of MPU access is not treated as an error.
2380 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2381 * -ENXIO on absent or invalid register target address space.
2383 static int __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data,
2384 int index, struct device_node *np)
2386 struct omap_hwmod_addr_space *mem;
2387 void __iomem *va_start = NULL;
2392 _save_mpu_port_index(oh);
2394 /* if we don't need sysc access we don't need to ioremap */
2395 if (!oh->class->sysc)
2398 /* we can't continue without MPU PORT if we need sysc access */
2399 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2402 mem = _find_mpu_rt_addr_space(oh);
2404 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2407 /* Extract the IO space from device tree blob */
2409 pr_err("omap_hwmod: %s: no dt node\n", oh->name);
2413 va_start = of_iomap(np, index + oh->mpu_rt_idx);
2415 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2420 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2422 pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n",
2423 oh->name, index, np->full_name);
2427 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2428 oh->name, va_start);
2430 oh->_mpu_rt_va = va_start;
2435 * _init - initialize internal data for the hwmod @oh
2436 * @oh: struct omap_hwmod *
2439 * Look up the clocks and the address space used by the MPU to access
2440 * registers belonging to the hwmod @oh. @oh must already be
2441 * registered at this point. This is the first of two phases for
2442 * hwmod initialization. Code called here does not touch any hardware
2443 * registers, it simply prepares internal data structures. Returns 0
2444 * upon success or if the hwmod isn't registered or if the hwmod's
2445 * address space is not defined, or -EINVAL upon failure.
2447 static int __init _init(struct omap_hwmod *oh, void *data)
2450 struct device_node *np = NULL;
2452 if (oh->_state != _HWMOD_STATE_REGISTERED)
2455 if (of_have_populated_dt()) {
2456 struct device_node *bus;
2458 bus = of_find_node_by_name(NULL, "ocp");
2462 r = of_dev_hwmod_lookup(bus, oh, &index, &np);
2464 pr_debug("omap_hwmod: %s missing dt data\n", oh->name);
2465 else if (np && index)
2466 pr_warn("omap_hwmod: %s using broken dt data from %s\n",
2467 oh->name, np->name);
2470 r = _init_mpu_rt_base(oh, NULL, index, np);
2472 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2477 r = _init_clocks(oh, NULL);
2479 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2484 if (of_find_property(np, "ti,no-reset-on-init", NULL))
2485 oh->flags |= HWMOD_INIT_NO_RESET;
2486 if (of_find_property(np, "ti,no-idle-on-init", NULL))
2487 oh->flags |= HWMOD_INIT_NO_IDLE;
2490 oh->_state = _HWMOD_STATE_INITIALIZED;
2496 * _setup_iclk_autoidle - configure an IP block's interface clocks
2497 * @oh: struct omap_hwmod *
2499 * Set up the module's interface clocks. XXX This function is still mostly
2500 * a stub; implementing this properly requires iclk autoidle usecounting in
2501 * the clock code. No return value.
2503 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2505 struct omap_hwmod_ocp_if *os;
2506 struct list_head *p;
2508 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2511 p = oh->slave_ports.next;
2513 while (i < oh->slaves_cnt) {
2514 os = _fetch_next_ocp_if(&p, &i);
2518 if (os->flags & OCPIF_SWSUP_IDLE) {
2519 /* XXX omap_iclk_deny_idle(c); */
2521 /* XXX omap_iclk_allow_idle(c); */
2522 clk_enable(os->_clk);
2530 * _setup_reset - reset an IP block during the setup process
2531 * @oh: struct omap_hwmod *
2533 * Reset the IP block corresponding to the hwmod @oh during the setup
2534 * process. The IP block is first enabled so it can be successfully
2535 * reset. Returns 0 upon success or a negative error code upon
2538 static int __init _setup_reset(struct omap_hwmod *oh)
2542 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2545 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2548 if (oh->rst_lines_cnt == 0) {
2551 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2552 oh->name, oh->_state);
2557 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2564 * _setup_postsetup - transition to the appropriate state after _setup
2565 * @oh: struct omap_hwmod *
2567 * Place an IP block represented by @oh into a "post-setup" state --
2568 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2569 * this function is called at the end of _setup().) The postsetup
2570 * state for an IP block can be changed by calling
2571 * omap_hwmod_enter_postsetup_state() early in the boot process,
2572 * before one of the omap_hwmod_setup*() functions are called for the
2575 * The IP block stays in this state until a PM runtime-based driver is
2576 * loaded for that IP block. A post-setup state of IDLE is
2577 * appropriate for almost all IP blocks with runtime PM-enabled
2578 * drivers, since those drivers are able to enable the IP block. A
2579 * post-setup state of ENABLED is appropriate for kernels with PM
2580 * runtime disabled. The DISABLED state is appropriate for unusual IP
2581 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2582 * included, since the WDTIMER starts running on reset and will reset
2583 * the MPU if left active.
2585 * This post-setup mechanism is deprecated. Once all of the OMAP
2586 * drivers have been converted to use PM runtime, and all of the IP
2587 * block data and interconnect data is available to the hwmod code, it
2588 * should be possible to replace this mechanism with a "lazy reset"
2589 * arrangement. In a "lazy reset" setup, each IP block is enabled
2590 * when the driver first probes, then all remaining IP blocks without
2591 * drivers are either shut down or enabled after the drivers have
2592 * loaded. However, this cannot take place until the above
2593 * preconditions have been met, since otherwise the late reset code
2594 * has no way of knowing which IP blocks are in use by drivers, and
2595 * which ones are unused.
2599 static void __init _setup_postsetup(struct omap_hwmod *oh)
2603 if (oh->rst_lines_cnt > 0)
2606 postsetup_state = oh->_postsetup_state;
2607 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2608 postsetup_state = _HWMOD_STATE_ENABLED;
2611 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2612 * it should be set by the core code as a runtime flag during startup
2614 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2615 (postsetup_state == _HWMOD_STATE_IDLE)) {
2616 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2617 postsetup_state = _HWMOD_STATE_ENABLED;
2620 if (postsetup_state == _HWMOD_STATE_IDLE)
2622 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2624 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2625 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2626 oh->name, postsetup_state);
2632 * _setup - prepare IP block hardware for use
2633 * @oh: struct omap_hwmod *
2634 * @n: (unused, pass NULL)
2636 * Configure the IP block represented by @oh. This may include
2637 * enabling the IP block, resetting it, and placing it into a
2638 * post-setup state, depending on the type of IP block and applicable
2639 * flags. IP blocks are reset to prevent any previous configuration
2640 * by the bootloader or previous operating system from interfering
2641 * with power management or other parts of the system. The reset can
2642 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2643 * two phases for hwmod initialization. Code called here generally
2644 * affects the IP block hardware, or system integration hardware
2645 * associated with the IP block. Returns 0.
2647 static int __init _setup(struct omap_hwmod *oh, void *data)
2649 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2652 if (oh->parent_hwmod) {
2655 r = _enable(oh->parent_hwmod);
2656 WARN(r, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2657 oh->name, oh->parent_hwmod->name);
2660 _setup_iclk_autoidle(oh);
2662 if (!_setup_reset(oh))
2663 _setup_postsetup(oh);
2665 if (oh->parent_hwmod) {
2668 postsetup_state = oh->parent_hwmod->_postsetup_state;
2670 if (postsetup_state == _HWMOD_STATE_IDLE)
2671 _idle(oh->parent_hwmod);
2672 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2673 _shutdown(oh->parent_hwmod);
2674 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2675 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2676 oh->parent_hwmod->name, postsetup_state);
2683 * _register - register a struct omap_hwmod
2684 * @oh: struct omap_hwmod *
2686 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2687 * already has been registered by the same name; -EINVAL if the
2688 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2689 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2690 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2693 * XXX The data should be copied into bootmem, so the original data
2694 * should be marked __initdata and freed after init. This would allow
2695 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2696 * that the copy process would be relatively complex due to the large number
2699 static int __init _register(struct omap_hwmod *oh)
2701 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2702 (oh->_state != _HWMOD_STATE_UNKNOWN))
2705 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2707 if (_lookup(oh->name))
2710 list_add_tail(&oh->node, &omap_hwmod_list);
2712 INIT_LIST_HEAD(&oh->master_ports);
2713 INIT_LIST_HEAD(&oh->slave_ports);
2714 spin_lock_init(&oh->_lock);
2715 lockdep_set_class(&oh->_lock, &oh->hwmod_key);
2717 oh->_state = _HWMOD_STATE_REGISTERED;
2720 * XXX Rather than doing a strcmp(), this should test a flag
2721 * set in the hwmod data, inserted by the autogenerator code.
2723 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2730 * _alloc_links - return allocated memory for hwmod links
2731 * @ml: pointer to a struct omap_hwmod_link * for the master link
2732 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2734 * Return pointers to two struct omap_hwmod_link records, via the
2735 * addresses pointed to by @ml and @sl. Will first attempt to return
2736 * memory allocated as part of a large initial block, but if that has
2737 * been exhausted, will allocate memory itself. Since ideally this
2738 * second allocation path will never occur, the number of these
2739 * 'supplemental' allocations will be logged when debugging is
2740 * enabled. Returns 0.
2742 static int __init _alloc_links(struct omap_hwmod_link **ml,
2743 struct omap_hwmod_link **sl)
2747 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2748 *ml = &linkspace[free_ls++];
2749 *sl = &linkspace[free_ls++];
2753 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2756 *ml = memblock_virt_alloc(sz, 0);
2758 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2761 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2762 ls_supp * LINKS_PER_OCP_IF);
2768 * _add_link - add an interconnect between two IP blocks
2769 * @oi: pointer to a struct omap_hwmod_ocp_if record
2771 * Add struct omap_hwmod_link records connecting the master IP block
2772 * specified in @oi->master to @oi, and connecting the slave IP block
2773 * specified in @oi->slave to @oi. This code is assumed to run before
2774 * preemption or SMP has been enabled, thus avoiding the need for
2775 * locking in this code. Changes to this assumption will require
2776 * additional locking. Returns 0.
2778 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2780 struct omap_hwmod_link *ml, *sl;
2782 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2785 _alloc_links(&ml, &sl);
2788 list_add(&ml->node, &oi->master->master_ports);
2789 oi->master->masters_cnt++;
2792 list_add(&sl->node, &oi->slave->slave_ports);
2793 oi->slave->slaves_cnt++;
2799 * _register_link - register a struct omap_hwmod_ocp_if
2800 * @oi: struct omap_hwmod_ocp_if *
2802 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2803 * has already been registered; -EINVAL if @oi is NULL or if the
2804 * record pointed to by @oi is missing required fields; or 0 upon
2807 * XXX The data should be copied into bootmem, so the original data
2808 * should be marked __initdata and freed after init. This would allow
2809 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2811 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2813 if (!oi || !oi->master || !oi->slave || !oi->user)
2816 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2819 pr_debug("omap_hwmod: registering link from %s to %s\n",
2820 oi->master->name, oi->slave->name);
2823 * Register the connected hwmods, if they haven't been
2824 * registered already
2826 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2827 _register(oi->master);
2829 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2830 _register(oi->slave);
2834 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2840 * _alloc_linkspace - allocate large block of hwmod links
2841 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2843 * Allocate a large block of struct omap_hwmod_link records. This
2844 * improves boot time significantly by avoiding the need to allocate
2845 * individual records one by one. If the number of records to
2846 * allocate in the block hasn't been manually specified, this function
2847 * will count the number of struct omap_hwmod_ocp_if records in @ois
2848 * and use that to determine the allocation size. For SoC families
2849 * that require multiple list registrations, such as OMAP3xxx, this
2850 * estimation process isn't optimal, so manual estimation is advised
2851 * in those cases. Returns -EEXIST if the allocation has already occurred
2852 * or 0 upon success.
2854 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2860 WARN(1, "linkspace already allocated\n");
2866 max_ls += LINKS_PER_OCP_IF;
2868 sz = sizeof(struct omap_hwmod_link) * max_ls;
2870 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2871 __func__, sz, max_ls);
2873 linkspace = memblock_virt_alloc(sz, 0);
2878 /* Static functions intended only for use in soc_ops field function pointers */
2881 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2882 * @oh: struct omap_hwmod *
2884 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2885 * does not have an IDLEST bit or if the module successfully leaves
2886 * slave idle; otherwise, pass along the return value of the
2887 * appropriate *_cm*_wait_module_ready() function.
2889 static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod *oh)
2894 if (oh->flags & HWMOD_NO_IDLEST)
2897 if (!_find_mpu_rt_port(oh))
2900 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2902 return omap_cm_wait_module_ready(0, oh->prcm.omap2.module_offs,
2903 oh->prcm.omap2.idlest_reg_id,
2904 oh->prcm.omap2.idlest_idle_bit);
2908 * _omap4_wait_target_ready - wait for a module to leave slave idle
2909 * @oh: struct omap_hwmod *
2911 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2912 * does not have an IDLEST bit or if the module successfully leaves
2913 * slave idle; otherwise, pass along the return value of the
2914 * appropriate *_cm*_wait_module_ready() function.
2916 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2921 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2924 if (!_find_mpu_rt_port(oh))
2927 /* XXX check module SIDLEMODE, hardreset status */
2929 return omap_cm_wait_module_ready(oh->clkdm->prcm_partition,
2931 oh->prcm.omap4.clkctrl_offs, 0);
2935 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2936 * @oh: struct omap_hwmod * to assert hardreset
2937 * @ohri: hardreset line data
2939 * Call omap2_prm_assert_hardreset() with parameters extracted from
2940 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2941 * use as an soc_ops function pointer. Passes along the return value
2942 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2943 * for removal when the PRM code is moved into drivers/.
2945 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2946 struct omap_hwmod_rst_info *ohri)
2948 return omap_prm_assert_hardreset(ohri->rst_shift, 0,
2949 oh->prcm.omap2.module_offs, 0);
2953 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2954 * @oh: struct omap_hwmod * to deassert hardreset
2955 * @ohri: hardreset line data
2957 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2958 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2959 * use as an soc_ops function pointer. Passes along the return value
2960 * from omap2_prm_deassert_hardreset(). XXX This function is
2961 * scheduled for removal when the PRM code is moved into drivers/.
2963 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2964 struct omap_hwmod_rst_info *ohri)
2966 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift, 0,
2967 oh->prcm.omap2.module_offs, 0, 0);
2971 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2972 * @oh: struct omap_hwmod * to test hardreset
2973 * @ohri: hardreset line data
2975 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2976 * from the hwmod @oh and the hardreset line data @ohri. Only
2977 * intended for use as an soc_ops function pointer. Passes along the
2978 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2979 * function is scheduled for removal when the PRM code is moved into
2982 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2983 struct omap_hwmod_rst_info *ohri)
2985 return omap_prm_is_hardreset_asserted(ohri->st_shift, 0,
2986 oh->prcm.omap2.module_offs, 0);
2990 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2991 * @oh: struct omap_hwmod * to assert hardreset
2992 * @ohri: hardreset line data
2994 * Call omap4_prminst_assert_hardreset() with parameters extracted
2995 * from the hwmod @oh and the hardreset line data @ohri. Only
2996 * intended for use as an soc_ops function pointer. Passes along the
2997 * return value from omap4_prminst_assert_hardreset(). XXX This
2998 * function is scheduled for removal when the PRM code is moved into
3001 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
3002 struct omap_hwmod_rst_info *ohri)
3007 return omap_prm_assert_hardreset(ohri->rst_shift,
3008 oh->clkdm->pwrdm.ptr->prcm_partition,
3009 oh->clkdm->pwrdm.ptr->prcm_offs,
3010 oh->prcm.omap4.rstctrl_offs);
3014 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3015 * @oh: struct omap_hwmod * to deassert hardreset
3016 * @ohri: hardreset line data
3018 * Call omap4_prminst_deassert_hardreset() with parameters extracted
3019 * from the hwmod @oh and the hardreset line data @ohri. Only
3020 * intended for use as an soc_ops function pointer. Passes along the
3021 * return value from omap4_prminst_deassert_hardreset(). XXX This
3022 * function is scheduled for removal when the PRM code is moved into
3025 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
3026 struct omap_hwmod_rst_info *ohri)
3032 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3033 oh->name, ohri->name);
3034 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->rst_shift,
3035 oh->clkdm->pwrdm.ptr->prcm_partition,
3036 oh->clkdm->pwrdm.ptr->prcm_offs,
3037 oh->prcm.omap4.rstctrl_offs,
3038 oh->prcm.omap4.rstctrl_offs +
3039 OMAP4_RST_CTRL_ST_OFFSET);
3043 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3044 * @oh: struct omap_hwmod * to test hardreset
3045 * @ohri: hardreset line data
3047 * Call omap4_prminst_is_hardreset_asserted() with parameters
3048 * extracted from the hwmod @oh and the hardreset line data @ohri.
3049 * Only intended for use as an soc_ops function pointer. Passes along
3050 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3051 * This function is scheduled for removal when the PRM code is moved
3054 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3055 struct omap_hwmod_rst_info *ohri)
3060 return omap_prm_is_hardreset_asserted(ohri->rst_shift,
3061 oh->clkdm->pwrdm.ptr->
3063 oh->clkdm->pwrdm.ptr->prcm_offs,
3064 oh->prcm.omap4.rstctrl_offs);
3068 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3069 * @oh: struct omap_hwmod * to deassert hardreset
3070 * @ohri: hardreset line data
3072 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3073 * from the hwmod @oh and the hardreset line data @ohri. Only
3074 * intended for use as an soc_ops function pointer. Passes along the
3075 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3076 * function is scheduled for removal when the PRM code is moved into
3079 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3080 struct omap_hwmod_rst_info *ohri)
3082 return omap_prm_deassert_hardreset(ohri->rst_shift, ohri->st_shift,
3083 oh->clkdm->pwrdm.ptr->prcm_partition,
3084 oh->clkdm->pwrdm.ptr->prcm_offs,
3085 oh->prcm.omap4.rstctrl_offs,
3086 oh->prcm.omap4.rstst_offs);
3089 /* Public functions */
3091 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3093 if (oh->flags & HWMOD_16BIT_REG)
3094 return readw_relaxed(oh->_mpu_rt_va + reg_offs);
3096 return readl_relaxed(oh->_mpu_rt_va + reg_offs);
3099 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3101 if (oh->flags & HWMOD_16BIT_REG)
3102 writew_relaxed(v, oh->_mpu_rt_va + reg_offs);
3104 writel_relaxed(v, oh->_mpu_rt_va + reg_offs);
3108 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3109 * @oh: struct omap_hwmod *
3111 * This is a public function exposed to drivers. Some drivers may need to do
3112 * some settings before and after resetting the device. Those drivers after
3113 * doing the necessary settings could use this function to start a reset by
3114 * setting the SYSCONFIG.SOFTRESET bit.
3116 int omap_hwmod_softreset(struct omap_hwmod *oh)
3121 if (!oh || !(oh->_sysc_cache))
3124 v = oh->_sysc_cache;
3125 ret = _set_softreset(oh, &v);
3128 _write_sysconfig(v, oh);
3130 ret = _clear_softreset(oh, &v);
3133 _write_sysconfig(v, oh);
3140 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3141 * @name: name of the omap_hwmod to look up
3143 * Given a @name of an omap_hwmod, return a pointer to the registered
3144 * struct omap_hwmod *, or NULL upon error.
3146 struct omap_hwmod *omap_hwmod_lookup(const char *name)
3148 struct omap_hwmod *oh;
3159 * omap_hwmod_for_each - call function for each registered omap_hwmod
3160 * @fn: pointer to a callback function
3161 * @data: void * data to pass to callback function
3163 * Call @fn for each registered omap_hwmod, passing @data to each
3164 * function. @fn must return 0 for success or any other value for
3165 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3166 * will stop and the non-zero return value will be passed to the
3167 * caller of omap_hwmod_for_each(). @fn is called with
3168 * omap_hwmod_for_each() held.
3170 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3173 struct omap_hwmod *temp_oh;
3179 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3180 ret = (*fn)(temp_oh, data);
3189 * omap_hwmod_register_links - register an array of hwmod links
3190 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3192 * Intended to be called early in boot before the clock framework is
3193 * initialized. If @ois is not null, will register all omap_hwmods
3194 * listed in @ois that are valid for this chip. Returns -EINVAL if
3195 * omap_hwmod_init() hasn't been called before calling this function,
3196 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3199 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3209 if (ois[0] == NULL) /* Empty list */
3213 if (_alloc_linkspace(ois)) {
3214 pr_err("omap_hwmod: could not allocate link space\n");
3221 r = _register_link(ois[i]);
3222 WARN(r && r != -EEXIST,
3223 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3224 ois[i]->master->name, ois[i]->slave->name, r);
3231 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3232 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3234 * If the hwmod data corresponding to the MPU subsystem IP block
3235 * hasn't been initialized and set up yet, do so now. This must be
3236 * done first since sleep dependencies may be added from other hwmods
3237 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3240 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3242 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3243 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3244 __func__, MPU_INITIATOR_NAME);
3245 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3246 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3250 * omap_hwmod_setup_one - set up a single hwmod
3251 * @oh_name: const char * name of the already-registered hwmod to set up
3253 * Initialize and set up a single hwmod. Intended to be used for a
3254 * small number of early devices, such as the timer IP blocks used for
3255 * the scheduler clock. Must be called after omap2_clk_init().
3256 * Resolves the struct clk names to struct clk pointers for each
3257 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3258 * -EINVAL upon error or 0 upon success.
3260 int __init omap_hwmod_setup_one(const char *oh_name)
3262 struct omap_hwmod *oh;
3264 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3266 oh = _lookup(oh_name);
3268 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3272 _ensure_mpu_hwmod_is_setup(oh);
3281 * omap_hwmod_setup_all - set up all registered IP blocks
3283 * Initialize and set up all IP blocks registered with the hwmod code.
3284 * Must be called after omap2_clk_init(). Resolves the struct clk
3285 * names to struct clk pointers for each registered omap_hwmod. Also
3286 * calls _setup() on each hwmod. Returns 0 upon success.
3288 static int __init omap_hwmod_setup_all(void)
3290 _ensure_mpu_hwmod_is_setup(NULL);
3292 omap_hwmod_for_each(_init, NULL);
3293 omap_hwmod_for_each(_setup, NULL);
3297 omap_core_initcall(omap_hwmod_setup_all);
3300 * omap_hwmod_enable - enable an omap_hwmod
3301 * @oh: struct omap_hwmod *
3303 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3304 * Returns -EINVAL on error or passes along the return value from _enable().
3306 int omap_hwmod_enable(struct omap_hwmod *oh)
3309 unsigned long flags;
3314 spin_lock_irqsave(&oh->_lock, flags);
3316 spin_unlock_irqrestore(&oh->_lock, flags);
3322 * omap_hwmod_idle - idle an omap_hwmod
3323 * @oh: struct omap_hwmod *
3325 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3326 * Returns -EINVAL on error or passes along the return value from _idle().
3328 int omap_hwmod_idle(struct omap_hwmod *oh)
3331 unsigned long flags;
3336 spin_lock_irqsave(&oh->_lock, flags);
3338 spin_unlock_irqrestore(&oh->_lock, flags);
3344 * omap_hwmod_shutdown - shutdown an omap_hwmod
3345 * @oh: struct omap_hwmod *
3347 * Shutdown an omap_hwmod @oh. Intended to be called by
3348 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3349 * the return value from _shutdown().
3351 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3354 unsigned long flags;
3359 spin_lock_irqsave(&oh->_lock, flags);
3361 spin_unlock_irqrestore(&oh->_lock, flags);
3367 * IP block data retrieval functions
3371 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3372 * @oh: struct omap_hwmod *
3373 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3375 * Count the number of struct resource array elements necessary to
3376 * contain omap_hwmod @oh resources. Intended to be called by code
3377 * that registers omap_devices. Intended to be used to determine the
3378 * size of a dynamically-allocated struct resource array, before
3379 * calling omap_hwmod_fill_resources(). Returns the number of struct
3380 * resource array elements needed.
3382 * XXX This code is not optimized. It could attempt to merge adjacent
3386 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3390 if (flags & IORESOURCE_IRQ)
3391 ret += _count_mpu_irqs(oh);
3393 if (flags & IORESOURCE_DMA)
3394 ret += _count_sdma_reqs(oh);
3396 if (flags & IORESOURCE_MEM) {
3398 struct omap_hwmod_ocp_if *os;
3399 struct list_head *p = oh->slave_ports.next;
3401 while (i < oh->slaves_cnt) {
3402 os = _fetch_next_ocp_if(&p, &i);
3403 ret += _count_ocp_if_addr_spaces(os);
3411 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3412 * @oh: struct omap_hwmod *
3413 * @res: pointer to the first element of an array of struct resource to fill
3415 * Fill the struct resource array @res with resource data from the
3416 * omap_hwmod @oh. Intended to be called by code that registers
3417 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3418 * number of array elements filled.
3420 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3422 struct omap_hwmod_ocp_if *os;
3423 struct list_head *p;
3424 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3427 /* For each IRQ, DMA, memory area, fill in array.*/
3429 mpu_irqs_cnt = _count_mpu_irqs(oh);
3430 for (i = 0; i < mpu_irqs_cnt; i++) {
3434 irq = oh->xlate_irq((oh->mpu_irqs + i)->irq);
3436 irq = (oh->mpu_irqs + i)->irq;
3437 (res + r)->name = (oh->mpu_irqs + i)->name;
3438 (res + r)->start = irq;
3439 (res + r)->end = irq;
3440 (res + r)->flags = IORESOURCE_IRQ;
3444 sdma_reqs_cnt = _count_sdma_reqs(oh);
3445 for (i = 0; i < sdma_reqs_cnt; i++) {
3446 (res + r)->name = (oh->sdma_reqs + i)->name;
3447 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3448 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3449 (res + r)->flags = IORESOURCE_DMA;
3453 p = oh->slave_ports.next;
3456 while (i < oh->slaves_cnt) {
3457 os = _fetch_next_ocp_if(&p, &i);
3458 addr_cnt = _count_ocp_if_addr_spaces(os);
3460 for (j = 0; j < addr_cnt; j++) {
3461 (res + r)->name = (os->addr + j)->name;
3462 (res + r)->start = (os->addr + j)->pa_start;
3463 (res + r)->end = (os->addr + j)->pa_end;
3464 (res + r)->flags = IORESOURCE_MEM;
3473 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3474 * @oh: struct omap_hwmod *
3475 * @res: pointer to the array of struct resource to fill
3477 * Fill the struct resource array @res with dma resource data from the
3478 * omap_hwmod @oh. Intended to be called by code that registers
3479 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3480 * number of array elements filled.
3482 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3484 int i, sdma_reqs_cnt;
3487 sdma_reqs_cnt = _count_sdma_reqs(oh);
3488 for (i = 0; i < sdma_reqs_cnt; i++) {
3489 (res + r)->name = (oh->sdma_reqs + i)->name;
3490 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3491 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3492 (res + r)->flags = IORESOURCE_DMA;
3500 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3501 * @oh: struct omap_hwmod * to operate on
3502 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3503 * @name: pointer to the name of the data to fetch (optional)
3504 * @rsrc: pointer to a struct resource, allocated by the caller
3506 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3507 * data for the IP block pointed to by @oh. The data will be filled
3508 * into a struct resource record pointed to by @rsrc. The struct
3509 * resource must be allocated by the caller. When @name is non-null,
3510 * the data associated with the matching entry in the IRQ/SDMA/address
3511 * space hwmod data arrays will be returned. If @name is null, the
3512 * first array entry will be returned. Data order is not meaningful
3513 * in hwmod data, so callers are strongly encouraged to use a non-null
3514 * @name whenever possible to avoid unpredictable effects if hwmod
3515 * data is later added that causes data ordering to change. This
3516 * function is only intended for use by OMAP core code. Device
3517 * drivers should not call this function - the appropriate bus-related
3518 * data accessor functions should be used instead. Returns 0 upon
3519 * success or a negative error code upon error.
3521 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3522 const char *name, struct resource *rsrc)
3525 unsigned int irq, dma;
3526 u32 pa_start, pa_end;
3531 if (type == IORESOURCE_IRQ) {
3532 r = _get_mpu_irq_by_name(oh, name, &irq);
3538 } else if (type == IORESOURCE_DMA) {
3539 r = _get_sdma_req_by_name(oh, name, &dma);
3545 } else if (type == IORESOURCE_MEM) {
3546 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3550 rsrc->start = pa_start;
3563 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3564 * @oh: struct omap_hwmod *
3566 * Return the powerdomain pointer associated with the OMAP module
3567 * @oh's main clock. If @oh does not have a main clk, return the
3568 * powerdomain associated with the interface clock associated with the
3569 * module's MPU port. (XXX Perhaps this should use the SDMA port
3570 * instead?) Returns NULL on error, or a struct powerdomain * on
3573 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3576 struct omap_hwmod_ocp_if *oi;
3577 struct clockdomain *clkdm;
3578 struct clk_hw_omap *clk;
3584 return oh->clkdm->pwrdm.ptr;
3589 oi = _find_mpu_rt_port(oh);
3595 clk = to_clk_hw_omap(__clk_get_hw(c));
3600 return clkdm->pwrdm.ptr;
3604 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3605 * @oh: struct omap_hwmod *
3607 * Returns the virtual address corresponding to the beginning of the
3608 * module's register target, in the address range that is intended to
3609 * be used by the MPU. Returns the virtual address upon success or NULL
3612 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3617 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3620 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3623 return oh->_mpu_rt_va;
3627 * XXX what about functions for drivers to save/restore ocp_sysconfig
3628 * for context save/restore operations?
3632 * omap_hwmod_enable_wakeup - allow device to wake up the system
3633 * @oh: struct omap_hwmod *
3635 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3636 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3637 * this IP block if it has dynamic mux entries. Eventually this
3638 * should set PRCM wakeup registers to cause the PRCM to receive
3639 * wakeup events from the module. Does not set any wakeup routing
3640 * registers beyond this point - if the module is to wake up any other
3641 * module or subsystem, that must be set separately. Called by
3642 * omap_device code. Returns -EINVAL on error or 0 upon success.
3644 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3646 unsigned long flags;
3649 spin_lock_irqsave(&oh->_lock, flags);
3651 if (oh->class->sysc &&
3652 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3653 v = oh->_sysc_cache;
3654 _enable_wakeup(oh, &v);
3655 _write_sysconfig(v, oh);
3658 _set_idle_ioring_wakeup(oh, true);
3659 spin_unlock_irqrestore(&oh->_lock, flags);
3665 * omap_hwmod_disable_wakeup - prevent device from waking the system
3666 * @oh: struct omap_hwmod *
3668 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3669 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3670 * events for this IP block if it has dynamic mux entries. Eventually
3671 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3672 * wakeup events from the module. Does not set any wakeup routing
3673 * registers beyond this point - if the module is to wake up any other
3674 * module or subsystem, that must be set separately. Called by
3675 * omap_device code. Returns -EINVAL on error or 0 upon success.
3677 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3679 unsigned long flags;
3682 spin_lock_irqsave(&oh->_lock, flags);
3684 if (oh->class->sysc &&
3685 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3686 v = oh->_sysc_cache;
3687 _disable_wakeup(oh, &v);
3688 _write_sysconfig(v, oh);
3691 _set_idle_ioring_wakeup(oh, false);
3692 spin_unlock_irqrestore(&oh->_lock, flags);
3698 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3699 * contained in the hwmod module.
3700 * @oh: struct omap_hwmod *
3701 * @name: name of the reset line to lookup and assert
3703 * Some IP like dsp, ipu or iva contain processor that require
3704 * an HW reset line to be assert / deassert in order to enable fully
3705 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3706 * yet supported on this OMAP; otherwise, passes along the return value
3707 * from _assert_hardreset().
3709 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3712 unsigned long flags;
3717 spin_lock_irqsave(&oh->_lock, flags);
3718 ret = _assert_hardreset(oh, name);
3719 spin_unlock_irqrestore(&oh->_lock, flags);
3725 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3726 * contained in the hwmod module.
3727 * @oh: struct omap_hwmod *
3728 * @name: name of the reset line to look up and deassert
3730 * Some IP like dsp, ipu or iva contain processor that require
3731 * an HW reset line to be assert / deassert in order to enable fully
3732 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3733 * yet supported on this OMAP; otherwise, passes along the return value
3734 * from _deassert_hardreset().
3736 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3739 unsigned long flags;
3744 spin_lock_irqsave(&oh->_lock, flags);
3745 ret = _deassert_hardreset(oh, name);
3746 spin_unlock_irqrestore(&oh->_lock, flags);
3752 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3753 * @classname: struct omap_hwmod_class name to search for
3754 * @fn: callback function pointer to call for each hwmod in class @classname
3755 * @user: arbitrary context data to pass to the callback function
3757 * For each omap_hwmod of class @classname, call @fn.
3758 * If the callback function returns something other than
3759 * zero, the iterator is terminated, and the callback function's return
3760 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3761 * if @classname or @fn are NULL, or passes back the error code from @fn.
3763 int omap_hwmod_for_each_by_class(const char *classname,
3764 int (*fn)(struct omap_hwmod *oh,
3768 struct omap_hwmod *temp_oh;
3771 if (!classname || !fn)
3774 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3775 __func__, classname);
3777 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3778 if (!strcmp(temp_oh->class->name, classname)) {
3779 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3780 __func__, temp_oh->name);
3781 ret = (*fn)(temp_oh, user);
3788 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3795 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3796 * @oh: struct omap_hwmod *
3797 * @state: state that _setup() should leave the hwmod in
3799 * Sets the hwmod state that @oh will enter at the end of _setup()
3800 * (called by omap_hwmod_setup_*()). See also the documentation
3801 * for _setup_postsetup(), above. Returns 0 upon success or
3802 * -EINVAL if there is a problem with the arguments or if the hwmod is
3803 * in the wrong state.
3805 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3808 unsigned long flags;
3813 if (state != _HWMOD_STATE_DISABLED &&
3814 state != _HWMOD_STATE_ENABLED &&
3815 state != _HWMOD_STATE_IDLE)
3818 spin_lock_irqsave(&oh->_lock, flags);
3820 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3825 oh->_postsetup_state = state;
3829 spin_unlock_irqrestore(&oh->_lock, flags);
3835 * omap_hwmod_get_context_loss_count - get lost context count
3836 * @oh: struct omap_hwmod *
3838 * Returns the context loss count of associated @oh
3839 * upon success, or zero if no context loss data is available.
3841 * On OMAP4, this queries the per-hwmod context loss register,
3842 * assuming one exists. If not, or on OMAP2/3, this queries the
3843 * enclosing powerdomain context loss count.
3845 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3847 struct powerdomain *pwrdm;
3850 if (soc_ops.get_context_lost)
3851 return soc_ops.get_context_lost(oh);
3853 pwrdm = omap_hwmod_get_pwrdm(oh);
3855 ret = pwrdm_get_context_loss_count(pwrdm);
3861 * omap_hwmod_init - initialize the hwmod code
3863 * Sets up some function pointers needed by the hwmod code to operate on the
3864 * currently-booted SoC. Intended to be called once during kernel init
3865 * before any hwmods are registered. No return value.
3867 void __init omap_hwmod_init(void)
3869 if (cpu_is_omap24xx()) {
3870 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3871 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3872 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3873 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3874 } else if (cpu_is_omap34xx()) {
3875 soc_ops.wait_target_ready = _omap2xxx_3xxx_wait_target_ready;
3876 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3877 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3878 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3879 soc_ops.init_clkdm = _init_clkdm;
3880 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
3881 soc_ops.enable_module = _omap4_enable_module;
3882 soc_ops.disable_module = _omap4_disable_module;
3883 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3884 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3885 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
3886 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3887 soc_ops.init_clkdm = _init_clkdm;
3888 soc_ops.update_context_lost = _omap4_update_context_lost;
3889 soc_ops.get_context_lost = _omap4_get_context_lost;
3890 } else if (cpu_is_ti816x() || soc_is_am33xx() || soc_is_am43xx()) {
3891 soc_ops.enable_module = _omap4_enable_module;
3892 soc_ops.disable_module = _omap4_disable_module;
3893 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3894 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3895 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
3896 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3897 soc_ops.init_clkdm = _init_clkdm;
3899 WARN(1, "omap_hwmod: unknown SoC type\n");
3906 * omap_hwmod_get_main_clk - get pointer to main clock name
3907 * @oh: struct omap_hwmod *
3909 * Returns the main clock name assocated with @oh upon success,
3910 * or NULL if @oh is NULL.
3912 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
3917 return oh->main_clk;