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 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
142 #include <plat/clock.h>
143 #include <plat/omap_hwmod.h>
144 #include <plat/prcm.h>
148 #include "clockdomain.h"
149 #include "powerdomain.h"
150 #include "cm2xxx_3xxx.h"
151 #include "cminst44xx.h"
153 #include "prm2xxx_3xxx.h"
156 #include "prminst44xx.h"
160 /* Maximum microseconds to wait for OMAP module to softreset */
161 #define MAX_MODULE_SOFTRESET_WAIT 10000
163 /* Name of the OMAP hwmod for the MPU */
164 #define MPU_INITIATOR_NAME "mpu"
167 * Number of struct omap_hwmod_link records per struct
168 * omap_hwmod_ocp_if record (master->slave and slave->master)
170 #define LINKS_PER_OCP_IF 2
173 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
174 * @enable_module: function to enable a module (via MODULEMODE)
175 * @disable_module: function to disable a module (via MODULEMODE)
177 * XXX Eventually this functionality will be hidden inside the PRM/CM
178 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
179 * conditionals in this code.
181 struct omap_hwmod_soc_ops {
182 void (*enable_module)(struct omap_hwmod *oh);
183 int (*disable_module)(struct omap_hwmod *oh);
184 int (*wait_target_ready)(struct omap_hwmod *oh);
185 int (*assert_hardreset)(struct omap_hwmod *oh,
186 struct omap_hwmod_rst_info *ohri);
187 int (*deassert_hardreset)(struct omap_hwmod *oh,
188 struct omap_hwmod_rst_info *ohri);
189 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
190 struct omap_hwmod_rst_info *ohri);
191 int (*init_clkdm)(struct omap_hwmod *oh);
194 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
195 static struct omap_hwmod_soc_ops soc_ops;
197 /* omap_hwmod_list contains all registered struct omap_hwmods */
198 static LIST_HEAD(omap_hwmod_list);
200 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
201 static struct omap_hwmod *mpu_oh;
203 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
204 static DEFINE_SPINLOCK(io_chain_lock);
207 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
208 * allocated from - used to reduce the number of small memory
209 * allocations, which has a significant impact on performance
211 static struct omap_hwmod_link *linkspace;
214 * free_ls, max_ls: array indexes into linkspace; representing the
215 * next free struct omap_hwmod_link index, and the maximum number of
216 * struct omap_hwmod_link records allocated (respectively)
218 static unsigned short free_ls, max_ls, ls_supp;
220 /* inited: set to true once the hwmod code is initialized */
223 /* Private functions */
226 * _fetch_next_ocp_if - return the next OCP interface in a list
227 * @p: ptr to a ptr to the list_head inside the ocp_if to return
228 * @i: pointer to the index of the element pointed to by @p in the list
230 * Return a pointer to the struct omap_hwmod_ocp_if record
231 * containing the struct list_head pointed to by @p, and increment
232 * @p such that a future call to this routine will return the next
235 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
238 struct omap_hwmod_ocp_if *oi;
240 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
249 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
250 * @oh: struct omap_hwmod *
252 * Load the current value of the hwmod OCP_SYSCONFIG register into the
253 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
254 * OCP_SYSCONFIG register or 0 upon success.
256 static int _update_sysc_cache(struct omap_hwmod *oh)
258 if (!oh->class->sysc) {
259 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
263 /* XXX ensure module interface clock is up */
265 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
267 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
268 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
274 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
275 * @v: OCP_SYSCONFIG value to write
276 * @oh: struct omap_hwmod *
278 * Write @v into the module class' OCP_SYSCONFIG register, if it has
279 * one. No return value.
281 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
283 if (!oh->class->sysc) {
284 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
288 /* XXX ensure module interface clock is up */
290 /* Module might have lost context, always update cache and register */
292 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
296 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
297 * @oh: struct omap_hwmod *
298 * @standbymode: MIDLEMODE field bits
299 * @v: pointer to register contents to modify
301 * Update the master standby mode bits in @v to be @standbymode for
302 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
303 * upon error or 0 upon success.
305 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
311 if (!oh->class->sysc ||
312 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
315 if (!oh->class->sysc->sysc_fields) {
316 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
320 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
321 mstandby_mask = (0x3 << mstandby_shift);
323 *v &= ~mstandby_mask;
324 *v |= __ffs(standbymode) << mstandby_shift;
330 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
331 * @oh: struct omap_hwmod *
332 * @idlemode: SIDLEMODE field bits
333 * @v: pointer to register contents to modify
335 * Update the slave idle mode bits in @v to be @idlemode for the @oh
336 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
339 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
344 if (!oh->class->sysc ||
345 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
348 if (!oh->class->sysc->sysc_fields) {
349 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
353 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
354 sidle_mask = (0x3 << sidle_shift);
357 *v |= __ffs(idlemode) << sidle_shift;
363 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
364 * @oh: struct omap_hwmod *
365 * @clockact: CLOCKACTIVITY field bits
366 * @v: pointer to register contents to modify
368 * Update the clockactivity mode bits in @v to be @clockact for the
369 * @oh hwmod. Used for additional powersaving on some modules. Does
370 * not write to the hardware. Returns -EINVAL upon error or 0 upon
373 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
378 if (!oh->class->sysc ||
379 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
382 if (!oh->class->sysc->sysc_fields) {
383 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
387 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
388 clkact_mask = (0x3 << clkact_shift);
391 *v |= clockact << clkact_shift;
397 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
398 * @oh: struct omap_hwmod *
399 * @v: pointer to register contents to modify
401 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
402 * error or 0 upon success.
404 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
408 if (!oh->class->sysc ||
409 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
412 if (!oh->class->sysc->sysc_fields) {
413 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
417 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
425 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
426 * @oh: struct omap_hwmod *
428 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
429 * of some modules. When the DMA must perform read/write accesses, the
430 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
431 * for power management, software must set the DMADISABLE bit back to 1.
433 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
434 * error or 0 upon success.
436 static int _set_dmadisable(struct omap_hwmod *oh)
441 if (!oh->class->sysc ||
442 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
445 if (!oh->class->sysc->sysc_fields) {
446 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
450 /* clocks must be on for this operation */
451 if (oh->_state != _HWMOD_STATE_ENABLED) {
452 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
456 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
460 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
461 v |= dmadisable_mask;
462 _write_sysconfig(v, oh);
468 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
469 * @oh: struct omap_hwmod *
470 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
471 * @v: pointer to register contents to modify
473 * Update the module autoidle bit in @v to be @autoidle for the @oh
474 * hwmod. The autoidle bit controls whether the module can gate
475 * internal clocks automatically when it isn't doing anything; the
476 * exact function of this bit varies on a per-module basis. This
477 * function does not write to the hardware. Returns -EINVAL upon
478 * error or 0 upon success.
480 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
486 if (!oh->class->sysc ||
487 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
490 if (!oh->class->sysc->sysc_fields) {
491 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
495 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
496 autoidle_mask = (0x1 << autoidle_shift);
498 *v &= ~autoidle_mask;
499 *v |= autoidle << autoidle_shift;
505 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
506 * @oh: struct omap_hwmod *
507 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
509 * Set or clear the I/O pad wakeup flag in the mux entries for the
510 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
511 * in memory. If the hwmod is currently idled, and the new idle
512 * values don't match the previous ones, this function will also
513 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
514 * currently idled, this function won't touch the hardware: the new
515 * mux settings are written to the SCM PADCTRL registers when the
516 * hwmod is idled. No return value.
518 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
520 struct omap_device_pad *pad;
525 if (!oh->mux || !oh->mux->enabled)
528 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
529 pad = oh->mux->pads_dynamic[j];
531 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
534 prev_idle = pad->idle;
537 pad->idle |= OMAP_WAKEUP_EN;
539 pad->idle &= ~OMAP_WAKEUP_EN;
541 if (prev_idle != pad->idle)
545 if (change && oh->_state == _HWMOD_STATE_IDLE)
546 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
550 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
551 * @oh: struct omap_hwmod *
553 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
554 * upon error or 0 upon success.
556 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
558 if (!oh->class->sysc ||
559 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
560 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
561 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
564 if (!oh->class->sysc->sysc_fields) {
565 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
569 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
570 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
572 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
573 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
574 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
575 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
577 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
579 oh->_int_flags |= _HWMOD_WAKEUP_ENABLED;
585 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
586 * @oh: struct omap_hwmod *
588 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
589 * upon error or 0 upon success.
591 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
593 if (!oh->class->sysc ||
594 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
595 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
596 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
599 if (!oh->class->sysc->sysc_fields) {
600 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
604 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
605 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
607 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
608 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
609 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
610 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
612 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
614 oh->_int_flags &= ~_HWMOD_WAKEUP_ENABLED;
620 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
621 * @oh: struct omap_hwmod *
623 * Prevent the hardware module @oh from entering idle while the
624 * hardare module initiator @init_oh is active. Useful when a module
625 * will be accessed by a particular initiator (e.g., if a module will
626 * be accessed by the IVA, there should be a sleepdep between the IVA
627 * initiator and the module). Only applies to modules in smart-idle
628 * mode. If the clockdomain is marked as not needing autodeps, return
629 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
630 * passes along clkdm_add_sleepdep() value upon success.
632 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
637 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
640 return clkdm_add_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
644 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
645 * @oh: struct omap_hwmod *
647 * Allow the hardware module @oh to enter idle while the hardare
648 * module initiator @init_oh is active. Useful when a module will not
649 * be accessed by a particular initiator (e.g., if a module will not
650 * be accessed by the IVA, there should be no sleepdep between the IVA
651 * initiator and the module). Only applies to modules in smart-idle
652 * mode. If the clockdomain is marked as not needing autodeps, return
653 * 0 without doing anything. Returns -EINVAL upon error or passes
654 * along clkdm_del_sleepdep() value upon success.
656 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
661 if (oh->_clk->clkdm && oh->_clk->clkdm->flags & CLKDM_NO_AUTODEPS)
664 return clkdm_del_sleepdep(oh->_clk->clkdm, init_oh->_clk->clkdm);
668 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
669 * @oh: struct omap_hwmod *
671 * Called from _init_clocks(). Populates the @oh _clk (main
672 * functional clock pointer) if a main_clk is present. Returns 0 on
673 * success or -EINVAL on error.
675 static int _init_main_clk(struct omap_hwmod *oh)
682 oh->_clk = omap_clk_get_by_name(oh->main_clk);
684 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
685 oh->name, oh->main_clk);
689 if (!oh->_clk->clkdm)
690 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
691 oh->main_clk, oh->_clk->name);
697 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
698 * @oh: struct omap_hwmod *
700 * Called from _init_clocks(). Populates the @oh OCP slave interface
701 * clock pointers. Returns 0 on success or -EINVAL on error.
703 static int _init_interface_clks(struct omap_hwmod *oh)
705 struct omap_hwmod_ocp_if *os;
711 p = oh->slave_ports.next;
713 while (i < oh->slaves_cnt) {
714 os = _fetch_next_ocp_if(&p, &i);
718 c = omap_clk_get_by_name(os->clk);
720 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
731 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
732 * @oh: struct omap_hwmod *
734 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
735 * clock pointers. Returns 0 on success or -EINVAL on error.
737 static int _init_opt_clks(struct omap_hwmod *oh)
739 struct omap_hwmod_opt_clk *oc;
744 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
745 c = omap_clk_get_by_name(oc->clk);
747 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
758 * _enable_clocks - enable hwmod main clock and interface clocks
759 * @oh: struct omap_hwmod *
761 * Enables all clocks necessary for register reads and writes to succeed
762 * on the hwmod @oh. Returns 0.
764 static int _enable_clocks(struct omap_hwmod *oh)
766 struct omap_hwmod_ocp_if *os;
770 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
773 clk_enable(oh->_clk);
775 p = oh->slave_ports.next;
777 while (i < oh->slaves_cnt) {
778 os = _fetch_next_ocp_if(&p, &i);
780 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
781 clk_enable(os->_clk);
784 /* The opt clocks are controlled by the device driver. */
790 * _disable_clocks - disable hwmod main clock and interface clocks
791 * @oh: struct omap_hwmod *
793 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
795 static int _disable_clocks(struct omap_hwmod *oh)
797 struct omap_hwmod_ocp_if *os;
801 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
804 clk_disable(oh->_clk);
806 p = oh->slave_ports.next;
808 while (i < oh->slaves_cnt) {
809 os = _fetch_next_ocp_if(&p, &i);
811 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
812 clk_disable(os->_clk);
815 /* The opt clocks are controlled by the device driver. */
820 static void _enable_optional_clocks(struct omap_hwmod *oh)
822 struct omap_hwmod_opt_clk *oc;
825 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
827 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
829 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
831 clk_enable(oc->_clk);
835 static void _disable_optional_clocks(struct omap_hwmod *oh)
837 struct omap_hwmod_opt_clk *oc;
840 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
842 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
844 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
846 clk_disable(oc->_clk);
851 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
852 * @oh: struct omap_hwmod *
854 * Enables the PRCM module mode related to the hwmod @oh.
857 static void _omap4_enable_module(struct omap_hwmod *oh)
859 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
862 pr_debug("omap_hwmod: %s: %s: %d\n",
863 oh->name, __func__, oh->prcm.omap4.modulemode);
865 omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
866 oh->clkdm->prcm_partition,
868 oh->clkdm->clkdm_offs,
869 oh->prcm.omap4.clkctrl_offs);
873 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
874 * @oh: struct omap_hwmod *
876 * Enables the PRCM module mode related to the hwmod @oh.
879 static void _am33xx_enable_module(struct omap_hwmod *oh)
881 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
884 pr_debug("omap_hwmod: %s: %s: %d\n",
885 oh->name, __func__, oh->prcm.omap4.modulemode);
887 am33xx_cm_module_enable(oh->prcm.omap4.modulemode, oh->clkdm->cm_inst,
888 oh->clkdm->clkdm_offs,
889 oh->prcm.omap4.clkctrl_offs);
893 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
894 * @oh: struct omap_hwmod *
896 * Wait for a module @oh to enter slave idle. Returns 0 if the module
897 * does not have an IDLEST bit or if the module successfully enters
898 * slave idle; otherwise, pass along the return value of the
899 * appropriate *_cm*_wait_module_idle() function.
901 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
903 if (!oh || !oh->clkdm)
906 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
909 if (oh->flags & HWMOD_NO_IDLEST)
912 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
914 oh->clkdm->clkdm_offs,
915 oh->prcm.omap4.clkctrl_offs);
919 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
920 * @oh: struct omap_hwmod *
922 * Wait for a module @oh to enter slave idle. Returns 0 if the module
923 * does not have an IDLEST bit or if the module successfully enters
924 * slave idle; otherwise, pass along the return value of the
925 * appropriate *_cm*_wait_module_idle() function.
927 static int _am33xx_wait_target_disable(struct omap_hwmod *oh)
932 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
935 if (oh->flags & HWMOD_NO_IDLEST)
938 return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst,
939 oh->clkdm->clkdm_offs,
940 oh->prcm.omap4.clkctrl_offs);
944 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
945 * @oh: struct omap_hwmod *oh
947 * Count and return the number of MPU IRQs associated with the hwmod
948 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
951 static int _count_mpu_irqs(struct omap_hwmod *oh)
953 struct omap_hwmod_irq_info *ohii;
956 if (!oh || !oh->mpu_irqs)
960 ohii = &oh->mpu_irqs[i++];
961 } while (ohii->irq != -1);
967 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
968 * @oh: struct omap_hwmod *oh
970 * Count and return the number of SDMA request lines associated with
971 * the hwmod @oh. Used to allocate struct resource data. Returns 0
974 static int _count_sdma_reqs(struct omap_hwmod *oh)
976 struct omap_hwmod_dma_info *ohdi;
979 if (!oh || !oh->sdma_reqs)
983 ohdi = &oh->sdma_reqs[i++];
984 } while (ohdi->dma_req != -1);
990 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
991 * @oh: struct omap_hwmod *oh
993 * Count and return the number of address space ranges associated with
994 * the hwmod @oh. Used to allocate struct resource data. Returns 0
997 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
999 struct omap_hwmod_addr_space *mem;
1002 if (!os || !os->addr)
1006 mem = &os->addr[i++];
1007 } while (mem->pa_start != mem->pa_end);
1013 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1014 * @oh: struct omap_hwmod * to operate on
1015 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1016 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1018 * Retrieve a MPU hardware IRQ line number named by @name associated
1019 * with the IP block pointed to by @oh. The IRQ number will be filled
1020 * into the address pointed to by @dma. When @name is non-null, the
1021 * IRQ line number associated with the named entry will be returned.
1022 * If @name is null, the first matching entry will be returned. Data
1023 * order is not meaningful in hwmod data, so callers are strongly
1024 * encouraged to use a non-null @name whenever possible to avoid
1025 * unpredictable effects if hwmod data is later added that causes data
1026 * ordering to change. Returns 0 upon success or a negative error
1029 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1039 while (oh->mpu_irqs[i].irq != -1) {
1040 if (name == oh->mpu_irqs[i].name ||
1041 !strcmp(name, oh->mpu_irqs[i].name)) {
1051 *irq = oh->mpu_irqs[i].irq;
1057 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1058 * @oh: struct omap_hwmod * to operate on
1059 * @name: pointer to the name of the SDMA request line to fetch (optional)
1060 * @dma: pointer to an unsigned int to store the request line ID to
1062 * Retrieve an SDMA request line ID named by @name on the IP block
1063 * pointed to by @oh. The ID will be filled into the address pointed
1064 * to by @dma. When @name is non-null, the request line ID associated
1065 * with the named entry will be returned. If @name is null, the first
1066 * matching entry will be returned. Data order is not meaningful in
1067 * hwmod data, so callers are strongly encouraged to use a non-null
1068 * @name whenever possible to avoid unpredictable effects if hwmod
1069 * data is later added that causes data ordering to change. Returns 0
1070 * upon success or a negative error code upon error.
1072 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1082 while (oh->sdma_reqs[i].dma_req != -1) {
1083 if (name == oh->sdma_reqs[i].name ||
1084 !strcmp(name, oh->sdma_reqs[i].name)) {
1094 *dma = oh->sdma_reqs[i].dma_req;
1100 * _get_addr_space_by_name - fetch address space start & end by name
1101 * @oh: struct omap_hwmod * to operate on
1102 * @name: pointer to the name of the address space to fetch (optional)
1103 * @pa_start: pointer to a u32 to store the starting address to
1104 * @pa_end: pointer to a u32 to store the ending address to
1106 * Retrieve address space start and end addresses for the IP block
1107 * pointed to by @oh. The data will be filled into the addresses
1108 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1109 * address space data associated with the named entry will be
1110 * returned. If @name is null, the first matching entry will be
1111 * returned. Data order is not meaningful in hwmod data, so callers
1112 * are strongly encouraged to use a non-null @name whenever possible
1113 * to avoid unpredictable effects if hwmod data is later added that
1114 * causes data ordering to change. Returns 0 upon success or a
1115 * negative error code upon error.
1117 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1118 u32 *pa_start, u32 *pa_end)
1121 struct omap_hwmod_ocp_if *os;
1122 struct list_head *p = NULL;
1125 p = oh->slave_ports.next;
1128 while (i < oh->slaves_cnt) {
1129 os = _fetch_next_ocp_if(&p, &i);
1135 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1136 if (name == os->addr[j].name ||
1137 !strcmp(name, os->addr[j].name)) {
1151 *pa_start = os->addr[j].pa_start;
1152 *pa_end = os->addr[j].pa_end;
1158 * _save_mpu_port_index - find and save the index to @oh's MPU port
1159 * @oh: struct omap_hwmod *
1161 * Determines the array index of the OCP slave port that the MPU uses
1162 * to address the device, and saves it into the struct omap_hwmod.
1163 * Intended to be called during hwmod registration only. No return
1166 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1168 struct omap_hwmod_ocp_if *os = NULL;
1169 struct list_head *p;
1175 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1177 p = oh->slave_ports.next;
1179 while (i < oh->slaves_cnt) {
1180 os = _fetch_next_ocp_if(&p, &i);
1181 if (os->user & OCP_USER_MPU) {
1183 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1192 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1193 * @oh: struct omap_hwmod *
1195 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1196 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1197 * communicate with the IP block. This interface need not be directly
1198 * connected to the MPU (and almost certainly is not), but is directly
1199 * connected to the IP block represented by @oh. Returns a pointer
1200 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1201 * error or if there does not appear to be a path from the MPU to this
1204 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1206 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1209 return oh->_mpu_port;
1213 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1214 * @oh: struct omap_hwmod *
1216 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1217 * the register target MPU address space; or returns NULL upon error.
1219 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1221 struct omap_hwmod_ocp_if *os;
1222 struct omap_hwmod_addr_space *mem;
1223 int found = 0, i = 0;
1225 os = _find_mpu_rt_port(oh);
1226 if (!os || !os->addr)
1230 mem = &os->addr[i++];
1231 if (mem->flags & ADDR_TYPE_RT)
1233 } while (!found && mem->pa_start != mem->pa_end);
1235 return (found) ? mem : NULL;
1239 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1240 * @oh: struct omap_hwmod *
1242 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1243 * by @oh is set to indicate to the PRCM that the IP block is active.
1244 * Usually this means placing the module into smart-idle mode and
1245 * smart-standby, but if there is a bug in the automatic idle handling
1246 * for the IP block, it may need to be placed into the force-idle or
1247 * no-idle variants of these modes. No return value.
1249 static void _enable_sysc(struct omap_hwmod *oh)
1255 if (!oh->class->sysc)
1258 v = oh->_sysc_cache;
1259 sf = oh->class->sysc->sysc_flags;
1261 if (sf & SYSC_HAS_SIDLEMODE) {
1262 clkdm_act = ((oh->clkdm &&
1263 oh->clkdm->flags & CLKDM_ACTIVE_WITH_MPU) ||
1264 (oh->_clk && oh->_clk->clkdm &&
1265 oh->_clk->clkdm->flags & CLKDM_ACTIVE_WITH_MPU));
1266 if (clkdm_act && !(oh->class->sysc->idlemodes &
1267 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1268 idlemode = HWMOD_IDLEMODE_FORCE;
1270 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
1271 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
1272 _set_slave_idlemode(oh, idlemode, &v);
1275 if (sf & SYSC_HAS_MIDLEMODE) {
1276 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1277 idlemode = HWMOD_IDLEMODE_NO;
1279 if (sf & SYSC_HAS_ENAWAKEUP)
1280 _enable_wakeup(oh, &v);
1281 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1282 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1284 idlemode = HWMOD_IDLEMODE_SMART;
1286 _set_master_standbymode(oh, idlemode, &v);
1290 * XXX The clock framework should handle this, by
1291 * calling into this code. But this must wait until the
1292 * clock structures are tagged with omap_hwmod entries
1294 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1295 (sf & SYSC_HAS_CLOCKACTIVITY))
1296 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1298 /* If slave is in SMARTIDLE, also enable wakeup */
1299 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1300 _enable_wakeup(oh, &v);
1302 _write_sysconfig(v, oh);
1305 * Set the autoidle bit only after setting the smartidle bit
1306 * Setting this will not have any impact on the other modules.
1308 if (sf & SYSC_HAS_AUTOIDLE) {
1309 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1311 _set_module_autoidle(oh, idlemode, &v);
1312 _write_sysconfig(v, oh);
1317 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1318 * @oh: struct omap_hwmod *
1320 * If module is marked as SWSUP_SIDLE, force the module into slave
1321 * idle; otherwise, configure it for smart-idle. If module is marked
1322 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1323 * configure it for smart-standby. No return value.
1325 static void _idle_sysc(struct omap_hwmod *oh)
1330 if (!oh->class->sysc)
1333 v = oh->_sysc_cache;
1334 sf = oh->class->sysc->sysc_flags;
1336 if (sf & SYSC_HAS_SIDLEMODE) {
1337 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1338 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1339 !(oh->class->sysc->idlemodes &
1340 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1341 idlemode = HWMOD_IDLEMODE_FORCE;
1343 idlemode = HWMOD_IDLEMODE_SMART;
1344 _set_slave_idlemode(oh, idlemode, &v);
1347 if (sf & SYSC_HAS_MIDLEMODE) {
1348 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1349 idlemode = HWMOD_IDLEMODE_FORCE;
1351 if (sf & SYSC_HAS_ENAWAKEUP)
1352 _enable_wakeup(oh, &v);
1353 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1354 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1356 idlemode = HWMOD_IDLEMODE_SMART;
1358 _set_master_standbymode(oh, idlemode, &v);
1361 /* If slave is in SMARTIDLE, also enable wakeup */
1362 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1363 _enable_wakeup(oh, &v);
1365 _write_sysconfig(v, oh);
1369 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1370 * @oh: struct omap_hwmod *
1372 * Force the module into slave idle and master suspend. No return
1375 static void _shutdown_sysc(struct omap_hwmod *oh)
1380 if (!oh->class->sysc)
1383 v = oh->_sysc_cache;
1384 sf = oh->class->sysc->sysc_flags;
1386 if (sf & SYSC_HAS_SIDLEMODE)
1387 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1389 if (sf & SYSC_HAS_MIDLEMODE)
1390 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1392 if (sf & SYSC_HAS_AUTOIDLE)
1393 _set_module_autoidle(oh, 1, &v);
1395 _write_sysconfig(v, oh);
1399 * _lookup - find an omap_hwmod by name
1400 * @name: find an omap_hwmod by name
1402 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1404 static struct omap_hwmod *_lookup(const char *name)
1406 struct omap_hwmod *oh, *temp_oh;
1410 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1411 if (!strcmp(name, temp_oh->name)) {
1421 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1422 * @oh: struct omap_hwmod *
1424 * Convert a clockdomain name stored in a struct omap_hwmod into a
1425 * clockdomain pointer, and save it into the struct omap_hwmod.
1426 * Return -EINVAL if the clkdm_name lookup failed.
1428 static int _init_clkdm(struct omap_hwmod *oh)
1430 if (!oh->clkdm_name)
1433 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1435 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1436 oh->name, oh->clkdm_name);
1440 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1441 oh->name, oh->clkdm_name);
1447 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1448 * well the clockdomain.
1449 * @oh: struct omap_hwmod *
1450 * @data: not used; pass NULL
1452 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1453 * Resolves all clock names embedded in the hwmod. Returns 0 on
1454 * success, or a negative error code on failure.
1456 static int _init_clocks(struct omap_hwmod *oh, void *data)
1460 if (oh->_state != _HWMOD_STATE_REGISTERED)
1463 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1465 ret |= _init_main_clk(oh);
1466 ret |= _init_interface_clks(oh);
1467 ret |= _init_opt_clks(oh);
1468 if (soc_ops.init_clkdm)
1469 ret |= soc_ops.init_clkdm(oh);
1472 oh->_state = _HWMOD_STATE_CLKS_INITED;
1474 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1480 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1481 * @oh: struct omap_hwmod *
1482 * @name: name of the reset line in the context of this hwmod
1483 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1485 * Return the bit position of the reset line that match the
1486 * input name. Return -ENOENT if not found.
1488 static u8 _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1489 struct omap_hwmod_rst_info *ohri)
1493 for (i = 0; i < oh->rst_lines_cnt; i++) {
1494 const char *rst_line = oh->rst_lines[i].name;
1495 if (!strcmp(rst_line, name)) {
1496 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1497 ohri->st_shift = oh->rst_lines[i].st_shift;
1498 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1499 oh->name, __func__, rst_line, ohri->rst_shift,
1510 * _assert_hardreset - assert the HW reset line of submodules
1511 * contained in the hwmod module.
1512 * @oh: struct omap_hwmod *
1513 * @name: name of the reset line to lookup and assert
1515 * Some IP like dsp, ipu or iva contain processor that require an HW
1516 * reset line to be assert / deassert in order to enable fully the IP.
1517 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1518 * asserting the hardreset line on the currently-booted SoC, or passes
1519 * along the return value from _lookup_hardreset() or the SoC's
1520 * assert_hardreset code.
1522 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1524 struct omap_hwmod_rst_info ohri;
1530 if (!soc_ops.assert_hardreset)
1533 ret = _lookup_hardreset(oh, name, &ohri);
1534 if (IS_ERR_VALUE(ret))
1537 ret = soc_ops.assert_hardreset(oh, &ohri);
1543 * _deassert_hardreset - deassert the HW reset line of submodules contained
1544 * in the hwmod module.
1545 * @oh: struct omap_hwmod *
1546 * @name: name of the reset line to look up and deassert
1548 * Some IP like dsp, ipu or iva contain processor that require an HW
1549 * reset line to be assert / deassert in order to enable fully the IP.
1550 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1551 * deasserting the hardreset line on the currently-booted SoC, or passes
1552 * along the return value from _lookup_hardreset() or the SoC's
1553 * deassert_hardreset code.
1555 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1557 struct omap_hwmod_rst_info ohri;
1563 if (!soc_ops.deassert_hardreset)
1566 ret = _lookup_hardreset(oh, name, &ohri);
1567 if (IS_ERR_VALUE(ret))
1570 ret = soc_ops.deassert_hardreset(oh, &ohri);
1572 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1578 * _read_hardreset - read the HW reset line state of submodules
1579 * contained in the hwmod module
1580 * @oh: struct omap_hwmod *
1581 * @name: name of the reset line to look up and read
1583 * Return the state of the reset line. Returns -EINVAL if @oh is
1584 * null, -ENOSYS if we have no way of reading the hardreset line
1585 * status on the currently-booted SoC, or passes along the return
1586 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1589 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1591 struct omap_hwmod_rst_info ohri;
1597 if (!soc_ops.is_hardreset_asserted)
1600 ret = _lookup_hardreset(oh, name, &ohri);
1601 if (IS_ERR_VALUE(ret))
1604 return soc_ops.is_hardreset_asserted(oh, &ohri);
1608 * _are_any_hardreset_lines_asserted - return true if part of @oh is hard-reset
1609 * @oh: struct omap_hwmod *
1611 * If any hardreset line associated with @oh is asserted, then return true.
1612 * Otherwise, if @oh has no hardreset lines associated with it, or if
1613 * no hardreset lines associated with @oh are asserted, then return false.
1614 * This function is used to avoid executing some parts of the IP block
1615 * enable/disable sequence if a hardreset line is set.
1617 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1621 if (oh->rst_lines_cnt == 0)
1624 for (i = 0; i < oh->rst_lines_cnt; i++)
1625 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1632 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1633 * @oh: struct omap_hwmod *
1635 * Disable the PRCM module mode related to the hwmod @oh.
1636 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1638 static int _omap4_disable_module(struct omap_hwmod *oh)
1642 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1645 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1647 omap4_cminst_module_disable(oh->clkdm->prcm_partition,
1649 oh->clkdm->clkdm_offs,
1650 oh->prcm.omap4.clkctrl_offs);
1652 if (_are_any_hardreset_lines_asserted(oh))
1655 v = _omap4_wait_target_disable(oh);
1657 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1664 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1665 * @oh: struct omap_hwmod *
1667 * Disable the PRCM module mode related to the hwmod @oh.
1668 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1670 static int _am33xx_disable_module(struct omap_hwmod *oh)
1674 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1677 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1679 am33xx_cm_module_disable(oh->clkdm->cm_inst, oh->clkdm->clkdm_offs,
1680 oh->prcm.omap4.clkctrl_offs);
1682 if (_are_any_hardreset_lines_asserted(oh))
1685 v = _am33xx_wait_target_disable(oh);
1687 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1694 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1695 * @oh: struct omap_hwmod *
1697 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1698 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1699 * reset this way, -EINVAL if the hwmod is in the wrong state,
1700 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1702 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1703 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1704 * use the SYSCONFIG softreset bit to provide the status.
1706 * Note that some IP like McBSP do have reset control but don't have
1709 static int _ocp_softreset(struct omap_hwmod *oh)
1711 u32 v, softrst_mask;
1715 if (!oh->class->sysc ||
1716 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1719 /* clocks must be on for this operation */
1720 if (oh->_state != _HWMOD_STATE_ENABLED) {
1721 pr_warning("omap_hwmod: %s: reset can only be entered from "
1722 "enabled state\n", oh->name);
1726 /* For some modules, all optionnal clocks need to be enabled as well */
1727 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1728 _enable_optional_clocks(oh);
1730 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1732 v = oh->_sysc_cache;
1733 ret = _set_softreset(oh, &v);
1736 _write_sysconfig(v, oh);
1738 if (oh->class->sysc->srst_udelay)
1739 udelay(oh->class->sysc->srst_udelay);
1741 if (oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
1742 omap_test_timeout((omap_hwmod_read(oh,
1743 oh->class->sysc->syss_offs)
1744 & SYSS_RESETDONE_MASK),
1745 MAX_MODULE_SOFTRESET_WAIT, c);
1746 else if (oh->class->sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
1747 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
1748 omap_test_timeout(!(omap_hwmod_read(oh,
1749 oh->class->sysc->sysc_offs)
1751 MAX_MODULE_SOFTRESET_WAIT, c);
1754 if (c == MAX_MODULE_SOFTRESET_WAIT)
1755 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1756 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1758 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1761 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1762 * _wait_target_ready() or _reset()
1765 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1768 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1769 _disable_optional_clocks(oh);
1775 * _reset - reset an omap_hwmod
1776 * @oh: struct omap_hwmod *
1778 * Resets an omap_hwmod @oh. If the module has a custom reset
1779 * function pointer defined, then call it to reset the IP block, and
1780 * pass along its return value to the caller. Otherwise, if the IP
1781 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1782 * associated with it, call a function to reset the IP block via that
1783 * method, and pass along the return value to the caller. Finally, if
1784 * the IP block has some hardreset lines associated with it, assert
1785 * all of those, but do _not_ deassert them. (This is because driver
1786 * authors have expressed an apparent requirement to control the
1787 * deassertion of the hardreset lines themselves.)
1789 * The default software reset mechanism for most OMAP IP blocks is
1790 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1791 * hwmods cannot be reset via this method. Some are not targets and
1792 * therefore have no OCP header registers to access. Others (like the
1793 * IVA) have idiosyncratic reset sequences. So for these relatively
1794 * rare cases, custom reset code can be supplied in the struct
1795 * omap_hwmod_class .reset function pointer.
1797 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1798 * does not prevent idling of the system. This is necessary for cases
1799 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1800 * kernel without disabling dma.
1802 * Passes along the return value from either _ocp_softreset() or the
1803 * custom reset function - these must return -EINVAL if the hwmod
1804 * cannot be reset this way or if the hwmod is in the wrong state,
1805 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1807 static int _reset(struct omap_hwmod *oh)
1811 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1813 if (oh->class->reset) {
1814 r = oh->class->reset(oh);
1816 if (oh->rst_lines_cnt > 0) {
1817 for (i = 0; i < oh->rst_lines_cnt; i++)
1818 _assert_hardreset(oh, oh->rst_lines[i].name);
1821 r = _ocp_softreset(oh);
1827 _set_dmadisable(oh);
1830 * OCP_SYSCONFIG bits need to be reprogrammed after a
1831 * softreset. The _enable() function should be split to avoid
1832 * the rewrite of the OCP_SYSCONFIG register.
1834 if (oh->class->sysc) {
1835 _update_sysc_cache(oh);
1843 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1845 * Call the appropriate PRM function to clear any logged I/O chain
1846 * wakeups and to reconfigure the chain. This apparently needs to be
1847 * done upon every mux change. Since hwmods can be concurrently
1848 * enabled and idled, hold a spinlock around the I/O chain
1849 * reconfiguration sequence. No return value.
1851 * XXX When the PRM code is moved to drivers, this function can be removed,
1852 * as the PRM infrastructure should abstract this.
1854 static void _reconfigure_io_chain(void)
1856 unsigned long flags;
1858 spin_lock_irqsave(&io_chain_lock, flags);
1860 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
1861 omap3xxx_prm_reconfigure_io_chain();
1862 else if (cpu_is_omap44xx())
1863 omap44xx_prm_reconfigure_io_chain();
1865 spin_unlock_irqrestore(&io_chain_lock, flags);
1869 * _enable - enable an omap_hwmod
1870 * @oh: struct omap_hwmod *
1872 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1873 * register target. Returns -EINVAL if the hwmod is in the wrong
1874 * state or passes along the return value of _wait_target_ready().
1876 static int _enable(struct omap_hwmod *oh)
1881 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
1884 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1885 * state at init. Now that someone is really trying to enable
1886 * them, just ensure that the hwmod mux is set.
1888 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
1890 * If the caller has mux data populated, do the mux'ing
1891 * which wouldn't have been done as part of the _enable()
1892 * done during setup.
1895 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
1897 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
1901 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
1902 oh->_state != _HWMOD_STATE_IDLE &&
1903 oh->_state != _HWMOD_STATE_DISABLED) {
1904 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
1910 * If an IP block contains HW reset lines and any of them are
1911 * asserted, we let integration code associated with that
1912 * block handle the enable. We've received very little
1913 * information on what those driver authors need, and until
1914 * detailed information is provided and the driver code is
1915 * posted to the public lists, this is probably the best we
1918 if (_are_any_hardreset_lines_asserted(oh))
1921 /* Mux pins for device runtime if populated */
1922 if (oh->mux && (!oh->mux->enabled ||
1923 ((oh->_state == _HWMOD_STATE_IDLE) &&
1924 oh->mux->pads_dynamic))) {
1925 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
1926 _reconfigure_io_chain();
1929 _add_initiator_dep(oh, mpu_oh);
1933 * A clockdomain must be in SW_SUP before enabling
1934 * completely the module. The clockdomain can be set
1935 * in HW_AUTO only when the module become ready.
1937 hwsup = clkdm_in_hwsup(oh->clkdm);
1938 r = clkdm_hwmod_enable(oh->clkdm, oh);
1940 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1941 oh->name, oh->clkdm->name, r);
1947 if (soc_ops.enable_module)
1948 soc_ops.enable_module(oh);
1950 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
1954 * Set the clockdomain to HW_AUTO only if the target is ready,
1955 * assuming that the previous state was HW_AUTO
1957 if (oh->clkdm && hwsup)
1958 clkdm_allow_idle(oh->clkdm);
1960 oh->_state = _HWMOD_STATE_ENABLED;
1962 /* Access the sysconfig only if the target is ready */
1963 if (oh->class->sysc) {
1964 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
1965 _update_sysc_cache(oh);
1969 _disable_clocks(oh);
1970 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1974 clkdm_hwmod_disable(oh->clkdm, oh);
1981 * _idle - idle an omap_hwmod
1982 * @oh: struct omap_hwmod *
1984 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1985 * no further work. Returns -EINVAL if the hwmod is in the wrong
1986 * state or returns 0.
1988 static int _idle(struct omap_hwmod *oh)
1990 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1992 if (oh->_state != _HWMOD_STATE_ENABLED) {
1993 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
1998 if (_are_any_hardreset_lines_asserted(oh))
2001 if (oh->class->sysc)
2003 _del_initiator_dep(oh, mpu_oh);
2005 if (soc_ops.disable_module)
2006 soc_ops.disable_module(oh);
2009 * The module must be in idle mode before disabling any parents
2010 * clocks. Otherwise, the parent clock might be disabled before
2011 * the module transition is done, and thus will prevent the
2012 * transition to complete properly.
2014 _disable_clocks(oh);
2016 clkdm_hwmod_disable(oh->clkdm, oh);
2018 /* Mux pins for device idle if populated */
2019 if (oh->mux && oh->mux->pads_dynamic) {
2020 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2021 _reconfigure_io_chain();
2024 oh->_state = _HWMOD_STATE_IDLE;
2030 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2031 * @oh: struct omap_hwmod *
2032 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2034 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2035 * local copy. Intended to be used by drivers that require
2036 * direct manipulation of the AUTOIDLE bits.
2037 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2038 * along the return value from _set_module_autoidle().
2040 * Any users of this function should be scrutinized carefully.
2042 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
2046 unsigned long flags;
2048 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
2051 spin_lock_irqsave(&oh->_lock, flags);
2053 v = oh->_sysc_cache;
2055 retval = _set_module_autoidle(oh, autoidle, &v);
2058 _write_sysconfig(v, oh);
2060 spin_unlock_irqrestore(&oh->_lock, flags);
2066 * _shutdown - shutdown an omap_hwmod
2067 * @oh: struct omap_hwmod *
2069 * Shut down an omap_hwmod @oh. This should be called when the driver
2070 * used for the hwmod is removed or unloaded or if the driver is not
2071 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2072 * state or returns 0.
2074 static int _shutdown(struct omap_hwmod *oh)
2079 if (oh->_state != _HWMOD_STATE_IDLE &&
2080 oh->_state != _HWMOD_STATE_ENABLED) {
2081 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2086 if (_are_any_hardreset_lines_asserted(oh))
2089 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2091 if (oh->class->pre_shutdown) {
2092 prev_state = oh->_state;
2093 if (oh->_state == _HWMOD_STATE_IDLE)
2095 ret = oh->class->pre_shutdown(oh);
2097 if (prev_state == _HWMOD_STATE_IDLE)
2103 if (oh->class->sysc) {
2104 if (oh->_state == _HWMOD_STATE_IDLE)
2109 /* clocks and deps are already disabled in idle */
2110 if (oh->_state == _HWMOD_STATE_ENABLED) {
2111 _del_initiator_dep(oh, mpu_oh);
2112 /* XXX what about the other system initiators here? dma, dsp */
2113 if (soc_ops.disable_module)
2114 soc_ops.disable_module(oh);
2115 _disable_clocks(oh);
2117 clkdm_hwmod_disable(oh->clkdm, oh);
2119 /* XXX Should this code also force-disable the optional clocks? */
2121 for (i = 0; i < oh->rst_lines_cnt; i++)
2122 _assert_hardreset(oh, oh->rst_lines[i].name);
2124 /* Mux pins to safe mode or use populated off mode values */
2126 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2128 oh->_state = _HWMOD_STATE_DISABLED;
2134 * _init_mpu_rt_base - populate the virtual address for a hwmod
2135 * @oh: struct omap_hwmod * to locate the virtual address
2137 * Cache the virtual address used by the MPU to access this IP block's
2138 * registers. This address is needed early so the OCP registers that
2139 * are part of the device's address space can be ioremapped properly.
2142 static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
2144 struct omap_hwmod_addr_space *mem;
2145 void __iomem *va_start;
2150 _save_mpu_port_index(oh);
2152 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2155 mem = _find_mpu_rt_addr_space(oh);
2157 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2162 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2164 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2168 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2169 oh->name, va_start);
2171 oh->_mpu_rt_va = va_start;
2175 * _init - initialize internal data for the hwmod @oh
2176 * @oh: struct omap_hwmod *
2179 * Look up the clocks and the address space used by the MPU to access
2180 * registers belonging to the hwmod @oh. @oh must already be
2181 * registered at this point. This is the first of two phases for
2182 * hwmod initialization. Code called here does not touch any hardware
2183 * registers, it simply prepares internal data structures. Returns 0
2184 * upon success or if the hwmod isn't registered, or -EINVAL upon
2187 static int __init _init(struct omap_hwmod *oh, void *data)
2191 if (oh->_state != _HWMOD_STATE_REGISTERED)
2194 _init_mpu_rt_base(oh, NULL);
2196 r = _init_clocks(oh, NULL);
2197 if (IS_ERR_VALUE(r)) {
2198 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2202 oh->_state = _HWMOD_STATE_INITIALIZED;
2208 * _setup_iclk_autoidle - configure an IP block's interface clocks
2209 * @oh: struct omap_hwmod *
2211 * Set up the module's interface clocks. XXX This function is still mostly
2212 * a stub; implementing this properly requires iclk autoidle usecounting in
2213 * the clock code. No return value.
2215 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2217 struct omap_hwmod_ocp_if *os;
2218 struct list_head *p;
2220 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2223 p = oh->slave_ports.next;
2225 while (i < oh->slaves_cnt) {
2226 os = _fetch_next_ocp_if(&p, &i);
2230 if (os->flags & OCPIF_SWSUP_IDLE) {
2231 /* XXX omap_iclk_deny_idle(c); */
2233 /* XXX omap_iclk_allow_idle(c); */
2234 clk_enable(os->_clk);
2242 * _setup_reset - reset an IP block during the setup process
2243 * @oh: struct omap_hwmod *
2245 * Reset the IP block corresponding to the hwmod @oh during the setup
2246 * process. The IP block is first enabled so it can be successfully
2247 * reset. Returns 0 upon success or a negative error code upon
2250 static int __init _setup_reset(struct omap_hwmod *oh)
2254 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2257 if (oh->rst_lines_cnt == 0) {
2260 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2261 oh->name, oh->_state);
2266 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2273 * _setup_postsetup - transition to the appropriate state after _setup
2274 * @oh: struct omap_hwmod *
2276 * Place an IP block represented by @oh into a "post-setup" state --
2277 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2278 * this function is called at the end of _setup().) The postsetup
2279 * state for an IP block can be changed by calling
2280 * omap_hwmod_enter_postsetup_state() early in the boot process,
2281 * before one of the omap_hwmod_setup*() functions are called for the
2284 * The IP block stays in this state until a PM runtime-based driver is
2285 * loaded for that IP block. A post-setup state of IDLE is
2286 * appropriate for almost all IP blocks with runtime PM-enabled
2287 * drivers, since those drivers are able to enable the IP block. A
2288 * post-setup state of ENABLED is appropriate for kernels with PM
2289 * runtime disabled. The DISABLED state is appropriate for unusual IP
2290 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2291 * included, since the WDTIMER starts running on reset and will reset
2292 * the MPU if left active.
2294 * This post-setup mechanism is deprecated. Once all of the OMAP
2295 * drivers have been converted to use PM runtime, and all of the IP
2296 * block data and interconnect data is available to the hwmod code, it
2297 * should be possible to replace this mechanism with a "lazy reset"
2298 * arrangement. In a "lazy reset" setup, each IP block is enabled
2299 * when the driver first probes, then all remaining IP blocks without
2300 * drivers are either shut down or enabled after the drivers have
2301 * loaded. However, this cannot take place until the above
2302 * preconditions have been met, since otherwise the late reset code
2303 * has no way of knowing which IP blocks are in use by drivers, and
2304 * which ones are unused.
2308 static void __init _setup_postsetup(struct omap_hwmod *oh)
2312 if (oh->rst_lines_cnt > 0)
2315 postsetup_state = oh->_postsetup_state;
2316 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2317 postsetup_state = _HWMOD_STATE_ENABLED;
2320 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2321 * it should be set by the core code as a runtime flag during startup
2323 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2324 (postsetup_state == _HWMOD_STATE_IDLE)) {
2325 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2326 postsetup_state = _HWMOD_STATE_ENABLED;
2329 if (postsetup_state == _HWMOD_STATE_IDLE)
2331 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2333 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2334 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2335 oh->name, postsetup_state);
2341 * _setup - prepare IP block hardware for use
2342 * @oh: struct omap_hwmod *
2343 * @n: (unused, pass NULL)
2345 * Configure the IP block represented by @oh. This may include
2346 * enabling the IP block, resetting it, and placing it into a
2347 * post-setup state, depending on the type of IP block and applicable
2348 * flags. IP blocks are reset to prevent any previous configuration
2349 * by the bootloader or previous operating system from interfering
2350 * with power management or other parts of the system. The reset can
2351 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2352 * two phases for hwmod initialization. Code called here generally
2353 * affects the IP block hardware, or system integration hardware
2354 * associated with the IP block. Returns 0.
2356 static int __init _setup(struct omap_hwmod *oh, void *data)
2358 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2361 _setup_iclk_autoidle(oh);
2363 if (!_setup_reset(oh))
2364 _setup_postsetup(oh);
2370 * _register - register a struct omap_hwmod
2371 * @oh: struct omap_hwmod *
2373 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2374 * already has been registered by the same name; -EINVAL if the
2375 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2376 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2377 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2380 * XXX The data should be copied into bootmem, so the original data
2381 * should be marked __initdata and freed after init. This would allow
2382 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2383 * that the copy process would be relatively complex due to the large number
2386 static int __init _register(struct omap_hwmod *oh)
2388 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2389 (oh->_state != _HWMOD_STATE_UNKNOWN))
2392 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2394 if (_lookup(oh->name))
2397 list_add_tail(&oh->node, &omap_hwmod_list);
2399 INIT_LIST_HEAD(&oh->master_ports);
2400 INIT_LIST_HEAD(&oh->slave_ports);
2401 spin_lock_init(&oh->_lock);
2403 oh->_state = _HWMOD_STATE_REGISTERED;
2406 * XXX Rather than doing a strcmp(), this should test a flag
2407 * set in the hwmod data, inserted by the autogenerator code.
2409 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2416 * _alloc_links - return allocated memory for hwmod links
2417 * @ml: pointer to a struct omap_hwmod_link * for the master link
2418 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2420 * Return pointers to two struct omap_hwmod_link records, via the
2421 * addresses pointed to by @ml and @sl. Will first attempt to return
2422 * memory allocated as part of a large initial block, but if that has
2423 * been exhausted, will allocate memory itself. Since ideally this
2424 * second allocation path will never occur, the number of these
2425 * 'supplemental' allocations will be logged when debugging is
2426 * enabled. Returns 0.
2428 static int __init _alloc_links(struct omap_hwmod_link **ml,
2429 struct omap_hwmod_link **sl)
2433 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2434 *ml = &linkspace[free_ls++];
2435 *sl = &linkspace[free_ls++];
2439 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2442 *ml = alloc_bootmem(sz);
2446 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2449 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2450 ls_supp * LINKS_PER_OCP_IF);
2456 * _add_link - add an interconnect between two IP blocks
2457 * @oi: pointer to a struct omap_hwmod_ocp_if record
2459 * Add struct omap_hwmod_link records connecting the master IP block
2460 * specified in @oi->master to @oi, and connecting the slave IP block
2461 * specified in @oi->slave to @oi. This code is assumed to run before
2462 * preemption or SMP has been enabled, thus avoiding the need for
2463 * locking in this code. Changes to this assumption will require
2464 * additional locking. Returns 0.
2466 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2468 struct omap_hwmod_link *ml, *sl;
2470 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2473 _alloc_links(&ml, &sl);
2476 INIT_LIST_HEAD(&ml->node);
2477 list_add(&ml->node, &oi->master->master_ports);
2478 oi->master->masters_cnt++;
2481 INIT_LIST_HEAD(&sl->node);
2482 list_add(&sl->node, &oi->slave->slave_ports);
2483 oi->slave->slaves_cnt++;
2489 * _register_link - register a struct omap_hwmod_ocp_if
2490 * @oi: struct omap_hwmod_ocp_if *
2492 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2493 * has already been registered; -EINVAL if @oi is NULL or if the
2494 * record pointed to by @oi is missing required fields; or 0 upon
2497 * XXX The data should be copied into bootmem, so the original data
2498 * should be marked __initdata and freed after init. This would allow
2499 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2501 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2503 if (!oi || !oi->master || !oi->slave || !oi->user)
2506 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2509 pr_debug("omap_hwmod: registering link from %s to %s\n",
2510 oi->master->name, oi->slave->name);
2513 * Register the connected hwmods, if they haven't been
2514 * registered already
2516 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2517 _register(oi->master);
2519 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2520 _register(oi->slave);
2524 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2530 * _alloc_linkspace - allocate large block of hwmod links
2531 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2533 * Allocate a large block of struct omap_hwmod_link records. This
2534 * improves boot time significantly by avoiding the need to allocate
2535 * individual records one by one. If the number of records to
2536 * allocate in the block hasn't been manually specified, this function
2537 * will count the number of struct omap_hwmod_ocp_if records in @ois
2538 * and use that to determine the allocation size. For SoC families
2539 * that require multiple list registrations, such as OMAP3xxx, this
2540 * estimation process isn't optimal, so manual estimation is advised
2541 * in those cases. Returns -EEXIST if the allocation has already occurred
2542 * or 0 upon success.
2544 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2550 WARN(1, "linkspace already allocated\n");
2556 max_ls += LINKS_PER_OCP_IF;
2558 sz = sizeof(struct omap_hwmod_link) * max_ls;
2560 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2561 __func__, sz, max_ls);
2563 linkspace = alloc_bootmem(sz);
2565 memset(linkspace, 0, sz);
2570 /* Static functions intended only for use in soc_ops field function pointers */
2573 * _omap2_wait_target_ready - wait for a module to leave slave idle
2574 * @oh: struct omap_hwmod *
2576 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2577 * does not have an IDLEST bit or if the module successfully leaves
2578 * slave idle; otherwise, pass along the return value of the
2579 * appropriate *_cm*_wait_module_ready() function.
2581 static int _omap2_wait_target_ready(struct omap_hwmod *oh)
2586 if (oh->flags & HWMOD_NO_IDLEST)
2589 if (!_find_mpu_rt_port(oh))
2592 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2594 return omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2595 oh->prcm.omap2.idlest_reg_id,
2596 oh->prcm.omap2.idlest_idle_bit);
2600 * _omap4_wait_target_ready - wait for a module to leave slave idle
2601 * @oh: struct omap_hwmod *
2603 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2604 * does not have an IDLEST bit or if the module successfully leaves
2605 * slave idle; otherwise, pass along the return value of the
2606 * appropriate *_cm*_wait_module_ready() function.
2608 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2610 if (!oh || !oh->clkdm)
2613 if (oh->flags & HWMOD_NO_IDLEST)
2616 if (!_find_mpu_rt_port(oh))
2619 /* XXX check module SIDLEMODE, hardreset status */
2621 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
2623 oh->clkdm->clkdm_offs,
2624 oh->prcm.omap4.clkctrl_offs);
2628 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2629 * @oh: struct omap_hwmod *
2631 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2632 * does not have an IDLEST bit or if the module successfully leaves
2633 * slave idle; otherwise, pass along the return value of the
2634 * appropriate *_cm*_wait_module_ready() function.
2636 static int _am33xx_wait_target_ready(struct omap_hwmod *oh)
2638 if (!oh || !oh->clkdm)
2641 if (oh->flags & HWMOD_NO_IDLEST)
2644 if (!_find_mpu_rt_port(oh))
2647 /* XXX check module SIDLEMODE, hardreset status */
2649 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst,
2650 oh->clkdm->clkdm_offs,
2651 oh->prcm.omap4.clkctrl_offs);
2655 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2656 * @oh: struct omap_hwmod * to assert hardreset
2657 * @ohri: hardreset line data
2659 * Call omap2_prm_assert_hardreset() with parameters extracted from
2660 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2661 * use as an soc_ops function pointer. Passes along the return value
2662 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2663 * for removal when the PRM code is moved into drivers/.
2665 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2666 struct omap_hwmod_rst_info *ohri)
2668 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
2673 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2674 * @oh: struct omap_hwmod * to deassert hardreset
2675 * @ohri: hardreset line data
2677 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2678 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2679 * use as an soc_ops function pointer. Passes along the return value
2680 * from omap2_prm_deassert_hardreset(). XXX This function is
2681 * scheduled for removal when the PRM code is moved into drivers/.
2683 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2684 struct omap_hwmod_rst_info *ohri)
2686 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
2692 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2693 * @oh: struct omap_hwmod * to test hardreset
2694 * @ohri: hardreset line data
2696 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2697 * from the hwmod @oh and the hardreset line data @ohri. Only
2698 * intended for use as an soc_ops function pointer. Passes along the
2699 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2700 * function is scheduled for removal when the PRM code is moved into
2703 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2704 struct omap_hwmod_rst_info *ohri)
2706 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
2711 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2712 * @oh: struct omap_hwmod * to assert hardreset
2713 * @ohri: hardreset line data
2715 * Call omap4_prminst_assert_hardreset() with parameters extracted
2716 * from the hwmod @oh and the hardreset line data @ohri. Only
2717 * intended for use as an soc_ops function pointer. Passes along the
2718 * return value from omap4_prminst_assert_hardreset(). XXX This
2719 * function is scheduled for removal when the PRM code is moved into
2722 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2723 struct omap_hwmod_rst_info *ohri)
2728 return omap4_prminst_assert_hardreset(ohri->rst_shift,
2729 oh->clkdm->pwrdm.ptr->prcm_partition,
2730 oh->clkdm->pwrdm.ptr->prcm_offs,
2731 oh->prcm.omap4.rstctrl_offs);
2735 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2736 * @oh: struct omap_hwmod * to deassert hardreset
2737 * @ohri: hardreset line data
2739 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2740 * from the hwmod @oh and the hardreset line data @ohri. Only
2741 * intended for use as an soc_ops function pointer. Passes along the
2742 * return value from omap4_prminst_deassert_hardreset(). XXX This
2743 * function is scheduled for removal when the PRM code is moved into
2746 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2747 struct omap_hwmod_rst_info *ohri)
2753 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2754 oh->name, ohri->name);
2755 return omap4_prminst_deassert_hardreset(ohri->rst_shift,
2756 oh->clkdm->pwrdm.ptr->prcm_partition,
2757 oh->clkdm->pwrdm.ptr->prcm_offs,
2758 oh->prcm.omap4.rstctrl_offs);
2762 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2763 * @oh: struct omap_hwmod * to test hardreset
2764 * @ohri: hardreset line data
2766 * Call omap4_prminst_is_hardreset_asserted() with parameters
2767 * extracted from the hwmod @oh and the hardreset line data @ohri.
2768 * Only intended for use as an soc_ops function pointer. Passes along
2769 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2770 * This function is scheduled for removal when the PRM code is moved
2773 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
2774 struct omap_hwmod_rst_info *ohri)
2779 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift,
2780 oh->clkdm->pwrdm.ptr->prcm_partition,
2781 oh->clkdm->pwrdm.ptr->prcm_offs,
2782 oh->prcm.omap4.rstctrl_offs);
2786 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2787 * @oh: struct omap_hwmod * to assert hardreset
2788 * @ohri: hardreset line data
2790 * Call am33xx_prminst_assert_hardreset() with parameters extracted
2791 * from the hwmod @oh and the hardreset line data @ohri. Only
2792 * intended for use as an soc_ops function pointer. Passes along the
2793 * return value from am33xx_prminst_assert_hardreset(). XXX This
2794 * function is scheduled for removal when the PRM code is moved into
2797 static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
2798 struct omap_hwmod_rst_info *ohri)
2801 return am33xx_prm_assert_hardreset(ohri->rst_shift,
2802 oh->clkdm->pwrdm.ptr->prcm_offs,
2803 oh->prcm.omap4.rstctrl_offs);
2807 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2808 * @oh: struct omap_hwmod * to deassert hardreset
2809 * @ohri: hardreset line data
2811 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2812 * from the hwmod @oh and the hardreset line data @ohri. Only
2813 * intended for use as an soc_ops function pointer. Passes along the
2814 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2815 * function is scheduled for removal when the PRM code is moved into
2818 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
2819 struct omap_hwmod_rst_info *ohri)
2822 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2823 oh->name, ohri->name);
2825 return am33xx_prm_deassert_hardreset(ohri->rst_shift,
2826 oh->clkdm->pwrdm.ptr->prcm_offs,
2827 oh->prcm.omap4.rstctrl_offs,
2828 oh->prcm.omap4.rstst_offs);
2832 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
2833 * @oh: struct omap_hwmod * to test hardreset
2834 * @ohri: hardreset line data
2836 * Call am33xx_prminst_is_hardreset_asserted() with parameters
2837 * extracted from the hwmod @oh and the hardreset line data @ohri.
2838 * Only intended for use as an soc_ops function pointer. Passes along
2839 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
2840 * This function is scheduled for removal when the PRM code is moved
2843 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh,
2844 struct omap_hwmod_rst_info *ohri)
2846 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift,
2847 oh->clkdm->pwrdm.ptr->prcm_offs,
2848 oh->prcm.omap4.rstctrl_offs);
2851 /* Public functions */
2853 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
2855 if (oh->flags & HWMOD_16BIT_REG)
2856 return __raw_readw(oh->_mpu_rt_va + reg_offs);
2858 return __raw_readl(oh->_mpu_rt_va + reg_offs);
2861 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
2863 if (oh->flags & HWMOD_16BIT_REG)
2864 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
2866 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
2870 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2871 * @oh: struct omap_hwmod *
2873 * This is a public function exposed to drivers. Some drivers may need to do
2874 * some settings before and after resetting the device. Those drivers after
2875 * doing the necessary settings could use this function to start a reset by
2876 * setting the SYSCONFIG.SOFTRESET bit.
2878 int omap_hwmod_softreset(struct omap_hwmod *oh)
2883 if (!oh || !(oh->_sysc_cache))
2886 v = oh->_sysc_cache;
2887 ret = _set_softreset(oh, &v);
2890 _write_sysconfig(v, oh);
2897 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
2898 * @oh: struct omap_hwmod *
2899 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
2901 * Sets the IP block's OCP slave idlemode in hardware, and updates our
2902 * local copy. Intended to be used by drivers that have some erratum
2903 * that requires direct manipulation of the SIDLEMODE bits. Returns
2904 * -EINVAL if @oh is null, or passes along the return value from
2905 * _set_slave_idlemode().
2907 * XXX Does this function have any current users? If not, we should
2908 * remove it; it is better to let the rest of the hwmod code handle this.
2909 * Any users of this function should be scrutinized carefully.
2911 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
2919 v = oh->_sysc_cache;
2921 retval = _set_slave_idlemode(oh, idlemode, &v);
2923 _write_sysconfig(v, oh);
2929 * omap_hwmod_lookup - look up a registered omap_hwmod by name
2930 * @name: name of the omap_hwmod to look up
2932 * Given a @name of an omap_hwmod, return a pointer to the registered
2933 * struct omap_hwmod *, or NULL upon error.
2935 struct omap_hwmod *omap_hwmod_lookup(const char *name)
2937 struct omap_hwmod *oh;
2948 * omap_hwmod_for_each - call function for each registered omap_hwmod
2949 * @fn: pointer to a callback function
2950 * @data: void * data to pass to callback function
2952 * Call @fn for each registered omap_hwmod, passing @data to each
2953 * function. @fn must return 0 for success or any other value for
2954 * failure. If @fn returns non-zero, the iteration across omap_hwmods
2955 * will stop and the non-zero return value will be passed to the
2956 * caller of omap_hwmod_for_each(). @fn is called with
2957 * omap_hwmod_for_each() held.
2959 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
2962 struct omap_hwmod *temp_oh;
2968 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
2969 ret = (*fn)(temp_oh, data);
2978 * omap_hwmod_register_links - register an array of hwmod links
2979 * @ois: pointer to an array of omap_hwmod_ocp_if to register
2981 * Intended to be called early in boot before the clock framework is
2982 * initialized. If @ois is not null, will register all omap_hwmods
2983 * listed in @ois that are valid for this chip. Returns -EINVAL if
2984 * omap_hwmod_init() hasn't been called before calling this function,
2985 * -ENOMEM if the link memory area can't be allocated, or 0 upon
2988 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
2999 if (_alloc_linkspace(ois)) {
3000 pr_err("omap_hwmod: could not allocate link space\n");
3007 r = _register_link(ois[i]);
3008 WARN(r && r != -EEXIST,
3009 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3010 ois[i]->master->name, ois[i]->slave->name, r);
3017 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3018 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3020 * If the hwmod data corresponding to the MPU subsystem IP block
3021 * hasn't been initialized and set up yet, do so now. This must be
3022 * done first since sleep dependencies may be added from other hwmods
3023 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3026 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3028 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3029 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3030 __func__, MPU_INITIATOR_NAME);
3031 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3032 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3036 * omap_hwmod_setup_one - set up a single hwmod
3037 * @oh_name: const char * name of the already-registered hwmod to set up
3039 * Initialize and set up a single hwmod. Intended to be used for a
3040 * small number of early devices, such as the timer IP blocks used for
3041 * the scheduler clock. Must be called after omap2_clk_init().
3042 * Resolves the struct clk names to struct clk pointers for each
3043 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3044 * -EINVAL upon error or 0 upon success.
3046 int __init omap_hwmod_setup_one(const char *oh_name)
3048 struct omap_hwmod *oh;
3050 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3052 oh = _lookup(oh_name);
3054 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3058 _ensure_mpu_hwmod_is_setup(oh);
3067 * omap_hwmod_setup_all - set up all registered IP blocks
3069 * Initialize and set up all IP blocks registered with the hwmod code.
3070 * Must be called after omap2_clk_init(). Resolves the struct clk
3071 * names to struct clk pointers for each registered omap_hwmod. Also
3072 * calls _setup() on each hwmod. Returns 0 upon success.
3074 static int __init omap_hwmod_setup_all(void)
3076 _ensure_mpu_hwmod_is_setup(NULL);
3078 omap_hwmod_for_each(_init, NULL);
3079 omap_hwmod_for_each(_setup, NULL);
3083 core_initcall(omap_hwmod_setup_all);
3086 * omap_hwmod_enable - enable an omap_hwmod
3087 * @oh: struct omap_hwmod *
3089 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3090 * Returns -EINVAL on error or passes along the return value from _enable().
3092 int omap_hwmod_enable(struct omap_hwmod *oh)
3095 unsigned long flags;
3100 spin_lock_irqsave(&oh->_lock, flags);
3102 spin_unlock_irqrestore(&oh->_lock, flags);
3108 * omap_hwmod_idle - idle an omap_hwmod
3109 * @oh: struct omap_hwmod *
3111 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3112 * Returns -EINVAL on error or passes along the return value from _idle().
3114 int omap_hwmod_idle(struct omap_hwmod *oh)
3116 unsigned long flags;
3121 spin_lock_irqsave(&oh->_lock, flags);
3123 spin_unlock_irqrestore(&oh->_lock, flags);
3129 * omap_hwmod_shutdown - shutdown an omap_hwmod
3130 * @oh: struct omap_hwmod *
3132 * Shutdown an omap_hwmod @oh. Intended to be called by
3133 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3134 * the return value from _shutdown().
3136 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3138 unsigned long flags;
3143 spin_lock_irqsave(&oh->_lock, flags);
3145 spin_unlock_irqrestore(&oh->_lock, flags);
3151 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3152 * @oh: struct omap_hwmod *oh
3154 * Intended to be called by the omap_device code.
3156 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
3158 unsigned long flags;
3160 spin_lock_irqsave(&oh->_lock, flags);
3162 spin_unlock_irqrestore(&oh->_lock, flags);
3168 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3169 * @oh: struct omap_hwmod *oh
3171 * Intended to be called by the omap_device code.
3173 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
3175 unsigned long flags;
3177 spin_lock_irqsave(&oh->_lock, flags);
3178 _disable_clocks(oh);
3179 spin_unlock_irqrestore(&oh->_lock, flags);
3185 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3186 * @oh: struct omap_hwmod *oh
3188 * Intended to be called by drivers and core code when all posted
3189 * writes to a device must complete before continuing further
3190 * execution (for example, after clearing some device IRQSTATUS
3193 * XXX what about targets with multiple OCP threads?
3195 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
3199 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
3200 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3206 * Forces posted writes to complete on the OCP thread handling
3209 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
3213 * omap_hwmod_reset - reset the hwmod
3214 * @oh: struct omap_hwmod *
3216 * Under some conditions, a driver may wish to reset the entire device.
3217 * Called from omap_device code. Returns -EINVAL on error or passes along
3218 * the return value from _reset().
3220 int omap_hwmod_reset(struct omap_hwmod *oh)
3223 unsigned long flags;
3228 spin_lock_irqsave(&oh->_lock, flags);
3230 spin_unlock_irqrestore(&oh->_lock, flags);
3236 * IP block data retrieval functions
3240 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3241 * @oh: struct omap_hwmod *
3242 * @res: pointer to the first element of an array of struct resource to fill
3244 * Count the number of struct resource array elements necessary to
3245 * contain omap_hwmod @oh resources. Intended to be called by code
3246 * that registers omap_devices. Intended to be used to determine the
3247 * size of a dynamically-allocated struct resource array, before
3248 * calling omap_hwmod_fill_resources(). Returns the number of struct
3249 * resource array elements needed.
3251 * XXX This code is not optimized. It could attempt to merge adjacent
3255 int omap_hwmod_count_resources(struct omap_hwmod *oh)
3257 struct omap_hwmod_ocp_if *os;
3258 struct list_head *p;
3262 ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
3264 p = oh->slave_ports.next;
3266 while (i < oh->slaves_cnt) {
3267 os = _fetch_next_ocp_if(&p, &i);
3268 ret += _count_ocp_if_addr_spaces(os);
3275 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3276 * @oh: struct omap_hwmod *
3277 * @res: pointer to the first element of an array of struct resource to fill
3279 * Fill the struct resource array @res with resource data from the
3280 * omap_hwmod @oh. Intended to be called by code that registers
3281 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3282 * number of array elements filled.
3284 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3286 struct omap_hwmod_ocp_if *os;
3287 struct list_head *p;
3288 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3291 /* For each IRQ, DMA, memory area, fill in array.*/
3293 mpu_irqs_cnt = _count_mpu_irqs(oh);
3294 for (i = 0; i < mpu_irqs_cnt; i++) {
3295 (res + r)->name = (oh->mpu_irqs + i)->name;
3296 (res + r)->start = (oh->mpu_irqs + i)->irq;
3297 (res + r)->end = (oh->mpu_irqs + i)->irq;
3298 (res + r)->flags = IORESOURCE_IRQ;
3302 sdma_reqs_cnt = _count_sdma_reqs(oh);
3303 for (i = 0; i < sdma_reqs_cnt; i++) {
3304 (res + r)->name = (oh->sdma_reqs + i)->name;
3305 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3306 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3307 (res + r)->flags = IORESOURCE_DMA;
3311 p = oh->slave_ports.next;
3314 while (i < oh->slaves_cnt) {
3315 os = _fetch_next_ocp_if(&p, &i);
3316 addr_cnt = _count_ocp_if_addr_spaces(os);
3318 for (j = 0; j < addr_cnt; j++) {
3319 (res + r)->name = (os->addr + j)->name;
3320 (res + r)->start = (os->addr + j)->pa_start;
3321 (res + r)->end = (os->addr + j)->pa_end;
3322 (res + r)->flags = IORESOURCE_MEM;
3331 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3332 * @oh: struct omap_hwmod * to operate on
3333 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3334 * @name: pointer to the name of the data to fetch (optional)
3335 * @rsrc: pointer to a struct resource, allocated by the caller
3337 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3338 * data for the IP block pointed to by @oh. The data will be filled
3339 * into a struct resource record pointed to by @rsrc. The struct
3340 * resource must be allocated by the caller. When @name is non-null,
3341 * the data associated with the matching entry in the IRQ/SDMA/address
3342 * space hwmod data arrays will be returned. If @name is null, the
3343 * first array entry will be returned. Data order is not meaningful
3344 * in hwmod data, so callers are strongly encouraged to use a non-null
3345 * @name whenever possible to avoid unpredictable effects if hwmod
3346 * data is later added that causes data ordering to change. This
3347 * function is only intended for use by OMAP core code. Device
3348 * drivers should not call this function - the appropriate bus-related
3349 * data accessor functions should be used instead. Returns 0 upon
3350 * success or a negative error code upon error.
3352 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3353 const char *name, struct resource *rsrc)
3356 unsigned int irq, dma;
3357 u32 pa_start, pa_end;
3362 if (type == IORESOURCE_IRQ) {
3363 r = _get_mpu_irq_by_name(oh, name, &irq);
3369 } else if (type == IORESOURCE_DMA) {
3370 r = _get_sdma_req_by_name(oh, name, &dma);
3376 } else if (type == IORESOURCE_MEM) {
3377 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3381 rsrc->start = pa_start;
3394 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3395 * @oh: struct omap_hwmod *
3397 * Return the powerdomain pointer associated with the OMAP module
3398 * @oh's main clock. If @oh does not have a main clk, return the
3399 * powerdomain associated with the interface clock associated with the
3400 * module's MPU port. (XXX Perhaps this should use the SDMA port
3401 * instead?) Returns NULL on error, or a struct powerdomain * on
3404 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3407 struct omap_hwmod_ocp_if *oi;
3415 oi = _find_mpu_rt_port(oh);
3424 return c->clkdm->pwrdm.ptr;
3429 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3430 * @oh: struct omap_hwmod *
3432 * Returns the virtual address corresponding to the beginning of the
3433 * module's register target, in the address range that is intended to
3434 * be used by the MPU. Returns the virtual address upon success or NULL
3437 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3442 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3445 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3448 return oh->_mpu_rt_va;
3452 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3453 * @oh: struct omap_hwmod *
3454 * @init_oh: struct omap_hwmod * (initiator)
3456 * Add a sleep dependency between the initiator @init_oh and @oh.
3457 * Intended to be called by DSP/Bridge code via platform_data for the
3458 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3459 * code needs to add/del initiator dependencies dynamically
3460 * before/after accessing a device. Returns the return value from
3461 * _add_initiator_dep().
3463 * XXX Keep a usecount in the clockdomain code
3465 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
3466 struct omap_hwmod *init_oh)
3468 return _add_initiator_dep(oh, init_oh);
3472 * XXX what about functions for drivers to save/restore ocp_sysconfig
3473 * for context save/restore operations?
3477 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3478 * @oh: struct omap_hwmod *
3479 * @init_oh: struct omap_hwmod * (initiator)
3481 * Remove a sleep dependency between the initiator @init_oh and @oh.
3482 * Intended to be called by DSP/Bridge code via platform_data for the
3483 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3484 * code needs to add/del initiator dependencies dynamically
3485 * before/after accessing a device. Returns the return value from
3486 * _del_initiator_dep().
3488 * XXX Keep a usecount in the clockdomain code
3490 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
3491 struct omap_hwmod *init_oh)
3493 return _del_initiator_dep(oh, init_oh);
3497 * omap_hwmod_enable_wakeup - allow device to wake up the system
3498 * @oh: struct omap_hwmod *
3500 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3501 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3502 * this IP block if it has dynamic mux entries. Eventually this
3503 * should set PRCM wakeup registers to cause the PRCM to receive
3504 * wakeup events from the module. Does not set any wakeup routing
3505 * registers beyond this point - if the module is to wake up any other
3506 * module or subsystem, that must be set separately. Called by
3507 * omap_device code. Returns -EINVAL on error or 0 upon success.
3509 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3511 unsigned long flags;
3514 spin_lock_irqsave(&oh->_lock, flags);
3516 if (oh->class->sysc &&
3517 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3518 v = oh->_sysc_cache;
3519 _enable_wakeup(oh, &v);
3520 _write_sysconfig(v, oh);
3523 _set_idle_ioring_wakeup(oh, true);
3524 spin_unlock_irqrestore(&oh->_lock, flags);
3530 * omap_hwmod_disable_wakeup - prevent device from waking the system
3531 * @oh: struct omap_hwmod *
3533 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3534 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3535 * events for this IP block if it has dynamic mux entries. Eventually
3536 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3537 * wakeup events from the module. Does not set any wakeup routing
3538 * registers beyond this point - if the module is to wake up any other
3539 * module or subsystem, that must be set separately. Called by
3540 * omap_device code. Returns -EINVAL on error or 0 upon success.
3542 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3544 unsigned long flags;
3547 spin_lock_irqsave(&oh->_lock, flags);
3549 if (oh->class->sysc &&
3550 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3551 v = oh->_sysc_cache;
3552 _disable_wakeup(oh, &v);
3553 _write_sysconfig(v, oh);
3556 _set_idle_ioring_wakeup(oh, false);
3557 spin_unlock_irqrestore(&oh->_lock, flags);
3563 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3564 * contained in the hwmod module.
3565 * @oh: struct omap_hwmod *
3566 * @name: name of the reset line to lookup and assert
3568 * Some IP like dsp, ipu or iva contain processor that require
3569 * an HW reset line to be assert / deassert in order to enable fully
3570 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3571 * yet supported on this OMAP; otherwise, passes along the return value
3572 * from _assert_hardreset().
3574 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3577 unsigned long flags;
3582 spin_lock_irqsave(&oh->_lock, flags);
3583 ret = _assert_hardreset(oh, name);
3584 spin_unlock_irqrestore(&oh->_lock, flags);
3590 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3591 * contained in the hwmod module.
3592 * @oh: struct omap_hwmod *
3593 * @name: name of the reset line to look up and deassert
3595 * Some IP like dsp, ipu or iva contain processor that require
3596 * an HW reset line to be assert / deassert in order to enable fully
3597 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3598 * yet supported on this OMAP; otherwise, passes along the return value
3599 * from _deassert_hardreset().
3601 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3604 unsigned long flags;
3609 spin_lock_irqsave(&oh->_lock, flags);
3610 ret = _deassert_hardreset(oh, name);
3611 spin_unlock_irqrestore(&oh->_lock, flags);
3617 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3618 * contained in the hwmod module
3619 * @oh: struct omap_hwmod *
3620 * @name: name of the reset line to look up and read
3622 * Return the current state of the hwmod @oh's reset line named @name:
3623 * returns -EINVAL upon parameter error or if this operation
3624 * is unsupported on the current OMAP; otherwise, passes along the return
3625 * value from _read_hardreset().
3627 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
3630 unsigned long flags;
3635 spin_lock_irqsave(&oh->_lock, flags);
3636 ret = _read_hardreset(oh, name);
3637 spin_unlock_irqrestore(&oh->_lock, flags);
3644 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3645 * @classname: struct omap_hwmod_class name to search for
3646 * @fn: callback function pointer to call for each hwmod in class @classname
3647 * @user: arbitrary context data to pass to the callback function
3649 * For each omap_hwmod of class @classname, call @fn.
3650 * If the callback function returns something other than
3651 * zero, the iterator is terminated, and the callback function's return
3652 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3653 * if @classname or @fn are NULL, or passes back the error code from @fn.
3655 int omap_hwmod_for_each_by_class(const char *classname,
3656 int (*fn)(struct omap_hwmod *oh,
3660 struct omap_hwmod *temp_oh;
3663 if (!classname || !fn)
3666 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3667 __func__, classname);
3669 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3670 if (!strcmp(temp_oh->class->name, classname)) {
3671 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3672 __func__, temp_oh->name);
3673 ret = (*fn)(temp_oh, user);
3680 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3687 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3688 * @oh: struct omap_hwmod *
3689 * @state: state that _setup() should leave the hwmod in
3691 * Sets the hwmod state that @oh will enter at the end of _setup()
3692 * (called by omap_hwmod_setup_*()). See also the documentation
3693 * for _setup_postsetup(), above. Returns 0 upon success or
3694 * -EINVAL if there is a problem with the arguments or if the hwmod is
3695 * in the wrong state.
3697 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3700 unsigned long flags;
3705 if (state != _HWMOD_STATE_DISABLED &&
3706 state != _HWMOD_STATE_ENABLED &&
3707 state != _HWMOD_STATE_IDLE)
3710 spin_lock_irqsave(&oh->_lock, flags);
3712 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3717 oh->_postsetup_state = state;
3721 spin_unlock_irqrestore(&oh->_lock, flags);
3727 * omap_hwmod_get_context_loss_count - get lost context count
3728 * @oh: struct omap_hwmod *
3730 * Query the powerdomain of of @oh to get the context loss
3731 * count for this device.
3733 * Returns the context loss count of the powerdomain assocated with @oh
3734 * upon success, or zero if no powerdomain exists for @oh.
3736 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3738 struct powerdomain *pwrdm;
3741 pwrdm = omap_hwmod_get_pwrdm(oh);
3743 ret = pwrdm_get_context_loss_count(pwrdm);
3749 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
3750 * @oh: struct omap_hwmod *
3752 * Prevent the hwmod @oh from being reset during the setup process.
3753 * Intended for use by board-*.c files on boards with devices that
3754 * cannot tolerate being reset. Must be called before the hwmod has
3755 * been set up. Returns 0 upon success or negative error code upon
3758 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
3763 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3764 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
3769 oh->flags |= HWMOD_INIT_NO_RESET;
3775 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
3776 * @oh: struct omap_hwmod * containing hwmod mux entries
3777 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
3778 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
3780 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
3781 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
3782 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
3783 * this function is not called for a given pad_idx, then the ISR
3784 * associated with @oh's first MPU IRQ will be triggered when an I/O
3785 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
3786 * the _dynamic or wakeup_ entry: if there are other entries not
3787 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
3788 * entries are NOT COUNTED in the dynamic pad index. This function
3789 * must be called separately for each pad that requires its interrupt
3790 * to be re-routed this way. Returns -EINVAL if there is an argument
3791 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
3792 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
3794 * XXX This function interface is fragile. Rather than using array
3795 * indexes, which are subject to unpredictable change, it should be
3796 * using hwmod IRQ names, and some other stable key for the hwmod mux
3799 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
3805 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
3806 pad_idx >= oh->mux->nr_pads_dynamic)
3809 /* Check the number of available mpu_irqs */
3810 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
3813 if (irq_idx >= nr_irqs)
3816 if (!oh->mux->irqs) {
3817 /* XXX What frees this? */
3818 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
3823 oh->mux->irqs[pad_idx] = irq_idx;
3829 * omap_hwmod_init - initialize the hwmod code
3831 * Sets up some function pointers needed by the hwmod code to operate on the
3832 * currently-booted SoC. Intended to be called once during kernel init
3833 * before any hwmods are registered. No return value.
3835 void __init omap_hwmod_init(void)
3837 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
3838 soc_ops.wait_target_ready = _omap2_wait_target_ready;
3839 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3840 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3841 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3842 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
3843 soc_ops.enable_module = _omap4_enable_module;
3844 soc_ops.disable_module = _omap4_disable_module;
3845 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3846 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3847 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
3848 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3849 soc_ops.init_clkdm = _init_clkdm;
3850 } else if (soc_is_am33xx()) {
3851 soc_ops.enable_module = _am33xx_enable_module;
3852 soc_ops.disable_module = _am33xx_disable_module;
3853 soc_ops.wait_target_ready = _am33xx_wait_target_ready;
3854 soc_ops.assert_hardreset = _am33xx_assert_hardreset;
3855 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
3856 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted;
3857 soc_ops.init_clkdm = _init_clkdm;
3859 WARN(1, "omap_hwmod: unknown SoC type\n");
3866 * omap_hwmod_get_main_clk - get pointer to main clock name
3867 * @oh: struct omap_hwmod *
3869 * Returns the main clock name assocated with @oh upon success,
3870 * or NULL if @oh is NULL.
3872 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
3877 return oh->main_clk;