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 _omap4_disable_module(oh);
1970 _disable_clocks(oh);
1971 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1975 clkdm_hwmod_disable(oh->clkdm, oh);
1982 * _idle - idle an omap_hwmod
1983 * @oh: struct omap_hwmod *
1985 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1986 * no further work. Returns -EINVAL if the hwmod is in the wrong
1987 * state or returns 0.
1989 static int _idle(struct omap_hwmod *oh)
1991 pr_debug("omap_hwmod: %s: idling\n", oh->name);
1993 if (oh->_state != _HWMOD_STATE_ENABLED) {
1994 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
1999 if (_are_any_hardreset_lines_asserted(oh))
2002 if (oh->class->sysc)
2004 _del_initiator_dep(oh, mpu_oh);
2006 if (soc_ops.disable_module)
2007 soc_ops.disable_module(oh);
2010 * The module must be in idle mode before disabling any parents
2011 * clocks. Otherwise, the parent clock might be disabled before
2012 * the module transition is done, and thus will prevent the
2013 * transition to complete properly.
2015 _disable_clocks(oh);
2017 clkdm_hwmod_disable(oh->clkdm, oh);
2019 /* Mux pins for device idle if populated */
2020 if (oh->mux && oh->mux->pads_dynamic) {
2021 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2022 _reconfigure_io_chain();
2025 oh->_state = _HWMOD_STATE_IDLE;
2031 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2032 * @oh: struct omap_hwmod *
2033 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2035 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2036 * local copy. Intended to be used by drivers that require
2037 * direct manipulation of the AUTOIDLE bits.
2038 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2039 * along the return value from _set_module_autoidle().
2041 * Any users of this function should be scrutinized carefully.
2043 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
2047 unsigned long flags;
2049 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
2052 spin_lock_irqsave(&oh->_lock, flags);
2054 v = oh->_sysc_cache;
2056 retval = _set_module_autoidle(oh, autoidle, &v);
2059 _write_sysconfig(v, oh);
2061 spin_unlock_irqrestore(&oh->_lock, flags);
2067 * _shutdown - shutdown an omap_hwmod
2068 * @oh: struct omap_hwmod *
2070 * Shut down an omap_hwmod @oh. This should be called when the driver
2071 * used for the hwmod is removed or unloaded or if the driver is not
2072 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2073 * state or returns 0.
2075 static int _shutdown(struct omap_hwmod *oh)
2080 if (oh->_state != _HWMOD_STATE_IDLE &&
2081 oh->_state != _HWMOD_STATE_ENABLED) {
2082 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2087 if (_are_any_hardreset_lines_asserted(oh))
2090 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2092 if (oh->class->pre_shutdown) {
2093 prev_state = oh->_state;
2094 if (oh->_state == _HWMOD_STATE_IDLE)
2096 ret = oh->class->pre_shutdown(oh);
2098 if (prev_state == _HWMOD_STATE_IDLE)
2104 if (oh->class->sysc) {
2105 if (oh->_state == _HWMOD_STATE_IDLE)
2110 /* clocks and deps are already disabled in idle */
2111 if (oh->_state == _HWMOD_STATE_ENABLED) {
2112 _del_initiator_dep(oh, mpu_oh);
2113 /* XXX what about the other system initiators here? dma, dsp */
2114 if (soc_ops.disable_module)
2115 soc_ops.disable_module(oh);
2116 _disable_clocks(oh);
2118 clkdm_hwmod_disable(oh->clkdm, oh);
2120 /* XXX Should this code also force-disable the optional clocks? */
2122 for (i = 0; i < oh->rst_lines_cnt; i++)
2123 _assert_hardreset(oh, oh->rst_lines[i].name);
2125 /* Mux pins to safe mode or use populated off mode values */
2127 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2129 oh->_state = _HWMOD_STATE_DISABLED;
2135 * _init_mpu_rt_base - populate the virtual address for a hwmod
2136 * @oh: struct omap_hwmod * to locate the virtual address
2138 * Cache the virtual address used by the MPU to access this IP block's
2139 * registers. This address is needed early so the OCP registers that
2140 * are part of the device's address space can be ioremapped properly.
2143 static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
2145 struct omap_hwmod_addr_space *mem;
2146 void __iomem *va_start;
2151 _save_mpu_port_index(oh);
2153 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2156 mem = _find_mpu_rt_addr_space(oh);
2158 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2163 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2165 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2169 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2170 oh->name, va_start);
2172 oh->_mpu_rt_va = va_start;
2176 * _init - initialize internal data for the hwmod @oh
2177 * @oh: struct omap_hwmod *
2180 * Look up the clocks and the address space used by the MPU to access
2181 * registers belonging to the hwmod @oh. @oh must already be
2182 * registered at this point. This is the first of two phases for
2183 * hwmod initialization. Code called here does not touch any hardware
2184 * registers, it simply prepares internal data structures. Returns 0
2185 * upon success or if the hwmod isn't registered, or -EINVAL upon
2188 static int __init _init(struct omap_hwmod *oh, void *data)
2192 if (oh->_state != _HWMOD_STATE_REGISTERED)
2195 _init_mpu_rt_base(oh, NULL);
2197 r = _init_clocks(oh, NULL);
2198 if (IS_ERR_VALUE(r)) {
2199 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2203 oh->_state = _HWMOD_STATE_INITIALIZED;
2209 * _setup_iclk_autoidle - configure an IP block's interface clocks
2210 * @oh: struct omap_hwmod *
2212 * Set up the module's interface clocks. XXX This function is still mostly
2213 * a stub; implementing this properly requires iclk autoidle usecounting in
2214 * the clock code. No return value.
2216 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2218 struct omap_hwmod_ocp_if *os;
2219 struct list_head *p;
2221 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2224 p = oh->slave_ports.next;
2226 while (i < oh->slaves_cnt) {
2227 os = _fetch_next_ocp_if(&p, &i);
2231 if (os->flags & OCPIF_SWSUP_IDLE) {
2232 /* XXX omap_iclk_deny_idle(c); */
2234 /* XXX omap_iclk_allow_idle(c); */
2235 clk_enable(os->_clk);
2243 * _setup_reset - reset an IP block during the setup process
2244 * @oh: struct omap_hwmod *
2246 * Reset the IP block corresponding to the hwmod @oh during the setup
2247 * process. The IP block is first enabled so it can be successfully
2248 * reset. Returns 0 upon success or a negative error code upon
2251 static int __init _setup_reset(struct omap_hwmod *oh)
2255 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2258 if (oh->rst_lines_cnt == 0) {
2261 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2262 oh->name, oh->_state);
2267 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2274 * _setup_postsetup - transition to the appropriate state after _setup
2275 * @oh: struct omap_hwmod *
2277 * Place an IP block represented by @oh into a "post-setup" state --
2278 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2279 * this function is called at the end of _setup().) The postsetup
2280 * state for an IP block can be changed by calling
2281 * omap_hwmod_enter_postsetup_state() early in the boot process,
2282 * before one of the omap_hwmod_setup*() functions are called for the
2285 * The IP block stays in this state until a PM runtime-based driver is
2286 * loaded for that IP block. A post-setup state of IDLE is
2287 * appropriate for almost all IP blocks with runtime PM-enabled
2288 * drivers, since those drivers are able to enable the IP block. A
2289 * post-setup state of ENABLED is appropriate for kernels with PM
2290 * runtime disabled. The DISABLED state is appropriate for unusual IP
2291 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2292 * included, since the WDTIMER starts running on reset and will reset
2293 * the MPU if left active.
2295 * This post-setup mechanism is deprecated. Once all of the OMAP
2296 * drivers have been converted to use PM runtime, and all of the IP
2297 * block data and interconnect data is available to the hwmod code, it
2298 * should be possible to replace this mechanism with a "lazy reset"
2299 * arrangement. In a "lazy reset" setup, each IP block is enabled
2300 * when the driver first probes, then all remaining IP blocks without
2301 * drivers are either shut down or enabled after the drivers have
2302 * loaded. However, this cannot take place until the above
2303 * preconditions have been met, since otherwise the late reset code
2304 * has no way of knowing which IP blocks are in use by drivers, and
2305 * which ones are unused.
2309 static void __init _setup_postsetup(struct omap_hwmod *oh)
2313 if (oh->rst_lines_cnt > 0)
2316 postsetup_state = oh->_postsetup_state;
2317 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2318 postsetup_state = _HWMOD_STATE_ENABLED;
2321 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2322 * it should be set by the core code as a runtime flag during startup
2324 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2325 (postsetup_state == _HWMOD_STATE_IDLE)) {
2326 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2327 postsetup_state = _HWMOD_STATE_ENABLED;
2330 if (postsetup_state == _HWMOD_STATE_IDLE)
2332 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2334 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2335 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2336 oh->name, postsetup_state);
2342 * _setup - prepare IP block hardware for use
2343 * @oh: struct omap_hwmod *
2344 * @n: (unused, pass NULL)
2346 * Configure the IP block represented by @oh. This may include
2347 * enabling the IP block, resetting it, and placing it into a
2348 * post-setup state, depending on the type of IP block and applicable
2349 * flags. IP blocks are reset to prevent any previous configuration
2350 * by the bootloader or previous operating system from interfering
2351 * with power management or other parts of the system. The reset can
2352 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2353 * two phases for hwmod initialization. Code called here generally
2354 * affects the IP block hardware, or system integration hardware
2355 * associated with the IP block. Returns 0.
2357 static int __init _setup(struct omap_hwmod *oh, void *data)
2359 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2362 _setup_iclk_autoidle(oh);
2364 if (!_setup_reset(oh))
2365 _setup_postsetup(oh);
2371 * _register - register a struct omap_hwmod
2372 * @oh: struct omap_hwmod *
2374 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2375 * already has been registered by the same name; -EINVAL if the
2376 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2377 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2378 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2381 * XXX The data should be copied into bootmem, so the original data
2382 * should be marked __initdata and freed after init. This would allow
2383 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2384 * that the copy process would be relatively complex due to the large number
2387 static int __init _register(struct omap_hwmod *oh)
2389 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2390 (oh->_state != _HWMOD_STATE_UNKNOWN))
2393 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2395 if (_lookup(oh->name))
2398 list_add_tail(&oh->node, &omap_hwmod_list);
2400 INIT_LIST_HEAD(&oh->master_ports);
2401 INIT_LIST_HEAD(&oh->slave_ports);
2402 spin_lock_init(&oh->_lock);
2404 oh->_state = _HWMOD_STATE_REGISTERED;
2407 * XXX Rather than doing a strcmp(), this should test a flag
2408 * set in the hwmod data, inserted by the autogenerator code.
2410 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2417 * _alloc_links - return allocated memory for hwmod links
2418 * @ml: pointer to a struct omap_hwmod_link * for the master link
2419 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2421 * Return pointers to two struct omap_hwmod_link records, via the
2422 * addresses pointed to by @ml and @sl. Will first attempt to return
2423 * memory allocated as part of a large initial block, but if that has
2424 * been exhausted, will allocate memory itself. Since ideally this
2425 * second allocation path will never occur, the number of these
2426 * 'supplemental' allocations will be logged when debugging is
2427 * enabled. Returns 0.
2429 static int __init _alloc_links(struct omap_hwmod_link **ml,
2430 struct omap_hwmod_link **sl)
2434 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2435 *ml = &linkspace[free_ls++];
2436 *sl = &linkspace[free_ls++];
2440 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2443 *ml = alloc_bootmem(sz);
2447 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2450 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2451 ls_supp * LINKS_PER_OCP_IF);
2457 * _add_link - add an interconnect between two IP blocks
2458 * @oi: pointer to a struct omap_hwmod_ocp_if record
2460 * Add struct omap_hwmod_link records connecting the master IP block
2461 * specified in @oi->master to @oi, and connecting the slave IP block
2462 * specified in @oi->slave to @oi. This code is assumed to run before
2463 * preemption or SMP has been enabled, thus avoiding the need for
2464 * locking in this code. Changes to this assumption will require
2465 * additional locking. Returns 0.
2467 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2469 struct omap_hwmod_link *ml, *sl;
2471 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2474 _alloc_links(&ml, &sl);
2477 INIT_LIST_HEAD(&ml->node);
2478 list_add(&ml->node, &oi->master->master_ports);
2479 oi->master->masters_cnt++;
2482 INIT_LIST_HEAD(&sl->node);
2483 list_add(&sl->node, &oi->slave->slave_ports);
2484 oi->slave->slaves_cnt++;
2490 * _register_link - register a struct omap_hwmod_ocp_if
2491 * @oi: struct omap_hwmod_ocp_if *
2493 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2494 * has already been registered; -EINVAL if @oi is NULL or if the
2495 * record pointed to by @oi is missing required fields; or 0 upon
2498 * XXX The data should be copied into bootmem, so the original data
2499 * should be marked __initdata and freed after init. This would allow
2500 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2502 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2504 if (!oi || !oi->master || !oi->slave || !oi->user)
2507 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2510 pr_debug("omap_hwmod: registering link from %s to %s\n",
2511 oi->master->name, oi->slave->name);
2514 * Register the connected hwmods, if they haven't been
2515 * registered already
2517 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2518 _register(oi->master);
2520 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2521 _register(oi->slave);
2525 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2531 * _alloc_linkspace - allocate large block of hwmod links
2532 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2534 * Allocate a large block of struct omap_hwmod_link records. This
2535 * improves boot time significantly by avoiding the need to allocate
2536 * individual records one by one. If the number of records to
2537 * allocate in the block hasn't been manually specified, this function
2538 * will count the number of struct omap_hwmod_ocp_if records in @ois
2539 * and use that to determine the allocation size. For SoC families
2540 * that require multiple list registrations, such as OMAP3xxx, this
2541 * estimation process isn't optimal, so manual estimation is advised
2542 * in those cases. Returns -EEXIST if the allocation has already occurred
2543 * or 0 upon success.
2545 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2551 WARN(1, "linkspace already allocated\n");
2557 max_ls += LINKS_PER_OCP_IF;
2559 sz = sizeof(struct omap_hwmod_link) * max_ls;
2561 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2562 __func__, sz, max_ls);
2564 linkspace = alloc_bootmem(sz);
2566 memset(linkspace, 0, sz);
2571 /* Static functions intended only for use in soc_ops field function pointers */
2574 * _omap2_wait_target_ready - wait for a module to leave slave idle
2575 * @oh: struct omap_hwmod *
2577 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2578 * does not have an IDLEST bit or if the module successfully leaves
2579 * slave idle; otherwise, pass along the return value of the
2580 * appropriate *_cm*_wait_module_ready() function.
2582 static int _omap2_wait_target_ready(struct omap_hwmod *oh)
2587 if (oh->flags & HWMOD_NO_IDLEST)
2590 if (!_find_mpu_rt_port(oh))
2593 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2595 return omap2_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2596 oh->prcm.omap2.idlest_reg_id,
2597 oh->prcm.omap2.idlest_idle_bit);
2601 * _omap4_wait_target_ready - wait for a module to leave slave idle
2602 * @oh: struct omap_hwmod *
2604 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2605 * does not have an IDLEST bit or if the module successfully leaves
2606 * slave idle; otherwise, pass along the return value of the
2607 * appropriate *_cm*_wait_module_ready() function.
2609 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2611 if (!oh || !oh->clkdm)
2614 if (oh->flags & HWMOD_NO_IDLEST)
2617 if (!_find_mpu_rt_port(oh))
2620 /* XXX check module SIDLEMODE, hardreset status */
2622 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
2624 oh->clkdm->clkdm_offs,
2625 oh->prcm.omap4.clkctrl_offs);
2629 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2630 * @oh: struct omap_hwmod *
2632 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2633 * does not have an IDLEST bit or if the module successfully leaves
2634 * slave idle; otherwise, pass along the return value of the
2635 * appropriate *_cm*_wait_module_ready() function.
2637 static int _am33xx_wait_target_ready(struct omap_hwmod *oh)
2639 if (!oh || !oh->clkdm)
2642 if (oh->flags & HWMOD_NO_IDLEST)
2645 if (!_find_mpu_rt_port(oh))
2648 /* XXX check module SIDLEMODE, hardreset status */
2650 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst,
2651 oh->clkdm->clkdm_offs,
2652 oh->prcm.omap4.clkctrl_offs);
2656 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2657 * @oh: struct omap_hwmod * to assert hardreset
2658 * @ohri: hardreset line data
2660 * Call omap2_prm_assert_hardreset() with parameters extracted from
2661 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2662 * use as an soc_ops function pointer. Passes along the return value
2663 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2664 * for removal when the PRM code is moved into drivers/.
2666 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2667 struct omap_hwmod_rst_info *ohri)
2669 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
2674 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2675 * @oh: struct omap_hwmod * to deassert hardreset
2676 * @ohri: hardreset line data
2678 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2679 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2680 * use as an soc_ops function pointer. Passes along the return value
2681 * from omap2_prm_deassert_hardreset(). XXX This function is
2682 * scheduled for removal when the PRM code is moved into drivers/.
2684 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2685 struct omap_hwmod_rst_info *ohri)
2687 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
2693 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2694 * @oh: struct omap_hwmod * to test hardreset
2695 * @ohri: hardreset line data
2697 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2698 * from the hwmod @oh and the hardreset line data @ohri. Only
2699 * intended for use as an soc_ops function pointer. Passes along the
2700 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2701 * function is scheduled for removal when the PRM code is moved into
2704 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2705 struct omap_hwmod_rst_info *ohri)
2707 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
2712 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2713 * @oh: struct omap_hwmod * to assert hardreset
2714 * @ohri: hardreset line data
2716 * Call omap4_prminst_assert_hardreset() with parameters extracted
2717 * from the hwmod @oh and the hardreset line data @ohri. Only
2718 * intended for use as an soc_ops function pointer. Passes along the
2719 * return value from omap4_prminst_assert_hardreset(). XXX This
2720 * function is scheduled for removal when the PRM code is moved into
2723 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2724 struct omap_hwmod_rst_info *ohri)
2729 return omap4_prminst_assert_hardreset(ohri->rst_shift,
2730 oh->clkdm->pwrdm.ptr->prcm_partition,
2731 oh->clkdm->pwrdm.ptr->prcm_offs,
2732 oh->prcm.omap4.rstctrl_offs);
2736 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2737 * @oh: struct omap_hwmod * to deassert hardreset
2738 * @ohri: hardreset line data
2740 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2741 * from the hwmod @oh and the hardreset line data @ohri. Only
2742 * intended for use as an soc_ops function pointer. Passes along the
2743 * return value from omap4_prminst_deassert_hardreset(). XXX This
2744 * function is scheduled for removal when the PRM code is moved into
2747 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2748 struct omap_hwmod_rst_info *ohri)
2754 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2755 oh->name, ohri->name);
2756 return omap4_prminst_deassert_hardreset(ohri->rst_shift,
2757 oh->clkdm->pwrdm.ptr->prcm_partition,
2758 oh->clkdm->pwrdm.ptr->prcm_offs,
2759 oh->prcm.omap4.rstctrl_offs);
2763 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2764 * @oh: struct omap_hwmod * to test hardreset
2765 * @ohri: hardreset line data
2767 * Call omap4_prminst_is_hardreset_asserted() with parameters
2768 * extracted from the hwmod @oh and the hardreset line data @ohri.
2769 * Only intended for use as an soc_ops function pointer. Passes along
2770 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2771 * This function is scheduled for removal when the PRM code is moved
2774 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
2775 struct omap_hwmod_rst_info *ohri)
2780 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift,
2781 oh->clkdm->pwrdm.ptr->prcm_partition,
2782 oh->clkdm->pwrdm.ptr->prcm_offs,
2783 oh->prcm.omap4.rstctrl_offs);
2787 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2788 * @oh: struct omap_hwmod * to assert hardreset
2789 * @ohri: hardreset line data
2791 * Call am33xx_prminst_assert_hardreset() with parameters extracted
2792 * from the hwmod @oh and the hardreset line data @ohri. Only
2793 * intended for use as an soc_ops function pointer. Passes along the
2794 * return value from am33xx_prminst_assert_hardreset(). XXX This
2795 * function is scheduled for removal when the PRM code is moved into
2798 static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
2799 struct omap_hwmod_rst_info *ohri)
2802 return am33xx_prm_assert_hardreset(ohri->rst_shift,
2803 oh->clkdm->pwrdm.ptr->prcm_offs,
2804 oh->prcm.omap4.rstctrl_offs);
2808 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2809 * @oh: struct omap_hwmod * to deassert hardreset
2810 * @ohri: hardreset line data
2812 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2813 * from the hwmod @oh and the hardreset line data @ohri. Only
2814 * intended for use as an soc_ops function pointer. Passes along the
2815 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2816 * function is scheduled for removal when the PRM code is moved into
2819 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
2820 struct omap_hwmod_rst_info *ohri)
2823 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2824 oh->name, ohri->name);
2826 return am33xx_prm_deassert_hardreset(ohri->rst_shift,
2827 oh->clkdm->pwrdm.ptr->prcm_offs,
2828 oh->prcm.omap4.rstctrl_offs,
2829 oh->prcm.omap4.rstst_offs);
2833 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
2834 * @oh: struct omap_hwmod * to test hardreset
2835 * @ohri: hardreset line data
2837 * Call am33xx_prminst_is_hardreset_asserted() with parameters
2838 * extracted from the hwmod @oh and the hardreset line data @ohri.
2839 * Only intended for use as an soc_ops function pointer. Passes along
2840 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
2841 * This function is scheduled for removal when the PRM code is moved
2844 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh,
2845 struct omap_hwmod_rst_info *ohri)
2847 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift,
2848 oh->clkdm->pwrdm.ptr->prcm_offs,
2849 oh->prcm.omap4.rstctrl_offs);
2852 /* Public functions */
2854 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
2856 if (oh->flags & HWMOD_16BIT_REG)
2857 return __raw_readw(oh->_mpu_rt_va + reg_offs);
2859 return __raw_readl(oh->_mpu_rt_va + reg_offs);
2862 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
2864 if (oh->flags & HWMOD_16BIT_REG)
2865 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
2867 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
2871 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2872 * @oh: struct omap_hwmod *
2874 * This is a public function exposed to drivers. Some drivers may need to do
2875 * some settings before and after resetting the device. Those drivers after
2876 * doing the necessary settings could use this function to start a reset by
2877 * setting the SYSCONFIG.SOFTRESET bit.
2879 int omap_hwmod_softreset(struct omap_hwmod *oh)
2884 if (!oh || !(oh->_sysc_cache))
2887 v = oh->_sysc_cache;
2888 ret = _set_softreset(oh, &v);
2891 _write_sysconfig(v, oh);
2898 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
2899 * @oh: struct omap_hwmod *
2900 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
2902 * Sets the IP block's OCP slave idlemode in hardware, and updates our
2903 * local copy. Intended to be used by drivers that have some erratum
2904 * that requires direct manipulation of the SIDLEMODE bits. Returns
2905 * -EINVAL if @oh is null, or passes along the return value from
2906 * _set_slave_idlemode().
2908 * XXX Does this function have any current users? If not, we should
2909 * remove it; it is better to let the rest of the hwmod code handle this.
2910 * Any users of this function should be scrutinized carefully.
2912 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
2920 v = oh->_sysc_cache;
2922 retval = _set_slave_idlemode(oh, idlemode, &v);
2924 _write_sysconfig(v, oh);
2930 * omap_hwmod_lookup - look up a registered omap_hwmod by name
2931 * @name: name of the omap_hwmod to look up
2933 * Given a @name of an omap_hwmod, return a pointer to the registered
2934 * struct omap_hwmod *, or NULL upon error.
2936 struct omap_hwmod *omap_hwmod_lookup(const char *name)
2938 struct omap_hwmod *oh;
2949 * omap_hwmod_for_each - call function for each registered omap_hwmod
2950 * @fn: pointer to a callback function
2951 * @data: void * data to pass to callback function
2953 * Call @fn for each registered omap_hwmod, passing @data to each
2954 * function. @fn must return 0 for success or any other value for
2955 * failure. If @fn returns non-zero, the iteration across omap_hwmods
2956 * will stop and the non-zero return value will be passed to the
2957 * caller of omap_hwmod_for_each(). @fn is called with
2958 * omap_hwmod_for_each() held.
2960 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
2963 struct omap_hwmod *temp_oh;
2969 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
2970 ret = (*fn)(temp_oh, data);
2979 * omap_hwmod_register_links - register an array of hwmod links
2980 * @ois: pointer to an array of omap_hwmod_ocp_if to register
2982 * Intended to be called early in boot before the clock framework is
2983 * initialized. If @ois is not null, will register all omap_hwmods
2984 * listed in @ois that are valid for this chip. Returns -EINVAL if
2985 * omap_hwmod_init() hasn't been called before calling this function,
2986 * -ENOMEM if the link memory area can't be allocated, or 0 upon
2989 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3000 if (_alloc_linkspace(ois)) {
3001 pr_err("omap_hwmod: could not allocate link space\n");
3008 r = _register_link(ois[i]);
3009 WARN(r && r != -EEXIST,
3010 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3011 ois[i]->master->name, ois[i]->slave->name, r);
3018 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3019 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3021 * If the hwmod data corresponding to the MPU subsystem IP block
3022 * hasn't been initialized and set up yet, do so now. This must be
3023 * done first since sleep dependencies may be added from other hwmods
3024 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3027 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3029 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3030 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3031 __func__, MPU_INITIATOR_NAME);
3032 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3033 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3037 * omap_hwmod_setup_one - set up a single hwmod
3038 * @oh_name: const char * name of the already-registered hwmod to set up
3040 * Initialize and set up a single hwmod. Intended to be used for a
3041 * small number of early devices, such as the timer IP blocks used for
3042 * the scheduler clock. Must be called after omap2_clk_init().
3043 * Resolves the struct clk names to struct clk pointers for each
3044 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3045 * -EINVAL upon error or 0 upon success.
3047 int __init omap_hwmod_setup_one(const char *oh_name)
3049 struct omap_hwmod *oh;
3051 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3053 oh = _lookup(oh_name);
3055 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3059 _ensure_mpu_hwmod_is_setup(oh);
3068 * omap_hwmod_setup_all - set up all registered IP blocks
3070 * Initialize and set up all IP blocks registered with the hwmod code.
3071 * Must be called after omap2_clk_init(). Resolves the struct clk
3072 * names to struct clk pointers for each registered omap_hwmod. Also
3073 * calls _setup() on each hwmod. Returns 0 upon success.
3075 static int __init omap_hwmod_setup_all(void)
3077 _ensure_mpu_hwmod_is_setup(NULL);
3079 omap_hwmod_for_each(_init, NULL);
3080 omap_hwmod_for_each(_setup, NULL);
3084 core_initcall(omap_hwmod_setup_all);
3087 * omap_hwmod_enable - enable an omap_hwmod
3088 * @oh: struct omap_hwmod *
3090 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3091 * Returns -EINVAL on error or passes along the return value from _enable().
3093 int omap_hwmod_enable(struct omap_hwmod *oh)
3096 unsigned long flags;
3101 spin_lock_irqsave(&oh->_lock, flags);
3103 spin_unlock_irqrestore(&oh->_lock, flags);
3109 * omap_hwmod_idle - idle an omap_hwmod
3110 * @oh: struct omap_hwmod *
3112 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3113 * Returns -EINVAL on error or passes along the return value from _idle().
3115 int omap_hwmod_idle(struct omap_hwmod *oh)
3117 unsigned long flags;
3122 spin_lock_irqsave(&oh->_lock, flags);
3124 spin_unlock_irqrestore(&oh->_lock, flags);
3130 * omap_hwmod_shutdown - shutdown an omap_hwmod
3131 * @oh: struct omap_hwmod *
3133 * Shutdown an omap_hwmod @oh. Intended to be called by
3134 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3135 * the return value from _shutdown().
3137 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3139 unsigned long flags;
3144 spin_lock_irqsave(&oh->_lock, flags);
3146 spin_unlock_irqrestore(&oh->_lock, flags);
3152 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3153 * @oh: struct omap_hwmod *oh
3155 * Intended to be called by the omap_device code.
3157 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
3159 unsigned long flags;
3161 spin_lock_irqsave(&oh->_lock, flags);
3163 spin_unlock_irqrestore(&oh->_lock, flags);
3169 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3170 * @oh: struct omap_hwmod *oh
3172 * Intended to be called by the omap_device code.
3174 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
3176 unsigned long flags;
3178 spin_lock_irqsave(&oh->_lock, flags);
3179 _disable_clocks(oh);
3180 spin_unlock_irqrestore(&oh->_lock, flags);
3186 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3187 * @oh: struct omap_hwmod *oh
3189 * Intended to be called by drivers and core code when all posted
3190 * writes to a device must complete before continuing further
3191 * execution (for example, after clearing some device IRQSTATUS
3194 * XXX what about targets with multiple OCP threads?
3196 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
3200 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
3201 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3207 * Forces posted writes to complete on the OCP thread handling
3210 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
3214 * omap_hwmod_reset - reset the hwmod
3215 * @oh: struct omap_hwmod *
3217 * Under some conditions, a driver may wish to reset the entire device.
3218 * Called from omap_device code. Returns -EINVAL on error or passes along
3219 * the return value from _reset().
3221 int omap_hwmod_reset(struct omap_hwmod *oh)
3224 unsigned long flags;
3229 spin_lock_irqsave(&oh->_lock, flags);
3231 spin_unlock_irqrestore(&oh->_lock, flags);
3237 * IP block data retrieval functions
3241 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3242 * @oh: struct omap_hwmod *
3243 * @res: pointer to the first element of an array of struct resource to fill
3245 * Count the number of struct resource array elements necessary to
3246 * contain omap_hwmod @oh resources. Intended to be called by code
3247 * that registers omap_devices. Intended to be used to determine the
3248 * size of a dynamically-allocated struct resource array, before
3249 * calling omap_hwmod_fill_resources(). Returns the number of struct
3250 * resource array elements needed.
3252 * XXX This code is not optimized. It could attempt to merge adjacent
3256 int omap_hwmod_count_resources(struct omap_hwmod *oh)
3258 struct omap_hwmod_ocp_if *os;
3259 struct list_head *p;
3263 ret = _count_mpu_irqs(oh) + _count_sdma_reqs(oh);
3265 p = oh->slave_ports.next;
3267 while (i < oh->slaves_cnt) {
3268 os = _fetch_next_ocp_if(&p, &i);
3269 ret += _count_ocp_if_addr_spaces(os);
3276 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3277 * @oh: struct omap_hwmod *
3278 * @res: pointer to the first element of an array of struct resource to fill
3280 * Fill the struct resource array @res with resource data from the
3281 * omap_hwmod @oh. Intended to be called by code that registers
3282 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3283 * number of array elements filled.
3285 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3287 struct omap_hwmod_ocp_if *os;
3288 struct list_head *p;
3289 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3292 /* For each IRQ, DMA, memory area, fill in array.*/
3294 mpu_irqs_cnt = _count_mpu_irqs(oh);
3295 for (i = 0; i < mpu_irqs_cnt; i++) {
3296 (res + r)->name = (oh->mpu_irqs + i)->name;
3297 (res + r)->start = (oh->mpu_irqs + i)->irq;
3298 (res + r)->end = (oh->mpu_irqs + i)->irq;
3299 (res + r)->flags = IORESOURCE_IRQ;
3303 sdma_reqs_cnt = _count_sdma_reqs(oh);
3304 for (i = 0; i < sdma_reqs_cnt; i++) {
3305 (res + r)->name = (oh->sdma_reqs + i)->name;
3306 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3307 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3308 (res + r)->flags = IORESOURCE_DMA;
3312 p = oh->slave_ports.next;
3315 while (i < oh->slaves_cnt) {
3316 os = _fetch_next_ocp_if(&p, &i);
3317 addr_cnt = _count_ocp_if_addr_spaces(os);
3319 for (j = 0; j < addr_cnt; j++) {
3320 (res + r)->name = (os->addr + j)->name;
3321 (res + r)->start = (os->addr + j)->pa_start;
3322 (res + r)->end = (os->addr + j)->pa_end;
3323 (res + r)->flags = IORESOURCE_MEM;
3332 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3333 * @oh: struct omap_hwmod * to operate on
3334 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3335 * @name: pointer to the name of the data to fetch (optional)
3336 * @rsrc: pointer to a struct resource, allocated by the caller
3338 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3339 * data for the IP block pointed to by @oh. The data will be filled
3340 * into a struct resource record pointed to by @rsrc. The struct
3341 * resource must be allocated by the caller. When @name is non-null,
3342 * the data associated with the matching entry in the IRQ/SDMA/address
3343 * space hwmod data arrays will be returned. If @name is null, the
3344 * first array entry will be returned. Data order is not meaningful
3345 * in hwmod data, so callers are strongly encouraged to use a non-null
3346 * @name whenever possible to avoid unpredictable effects if hwmod
3347 * data is later added that causes data ordering to change. This
3348 * function is only intended for use by OMAP core code. Device
3349 * drivers should not call this function - the appropriate bus-related
3350 * data accessor functions should be used instead. Returns 0 upon
3351 * success or a negative error code upon error.
3353 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3354 const char *name, struct resource *rsrc)
3357 unsigned int irq, dma;
3358 u32 pa_start, pa_end;
3363 if (type == IORESOURCE_IRQ) {
3364 r = _get_mpu_irq_by_name(oh, name, &irq);
3370 } else if (type == IORESOURCE_DMA) {
3371 r = _get_sdma_req_by_name(oh, name, &dma);
3377 } else if (type == IORESOURCE_MEM) {
3378 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3382 rsrc->start = pa_start;
3395 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3396 * @oh: struct omap_hwmod *
3398 * Return the powerdomain pointer associated with the OMAP module
3399 * @oh's main clock. If @oh does not have a main clk, return the
3400 * powerdomain associated with the interface clock associated with the
3401 * module's MPU port. (XXX Perhaps this should use the SDMA port
3402 * instead?) Returns NULL on error, or a struct powerdomain * on
3405 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3408 struct omap_hwmod_ocp_if *oi;
3416 oi = _find_mpu_rt_port(oh);
3425 return c->clkdm->pwrdm.ptr;
3430 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3431 * @oh: struct omap_hwmod *
3433 * Returns the virtual address corresponding to the beginning of the
3434 * module's register target, in the address range that is intended to
3435 * be used by the MPU. Returns the virtual address upon success or NULL
3438 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3443 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3446 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3449 return oh->_mpu_rt_va;
3453 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3454 * @oh: struct omap_hwmod *
3455 * @init_oh: struct omap_hwmod * (initiator)
3457 * Add a sleep dependency between the initiator @init_oh and @oh.
3458 * Intended to be called by DSP/Bridge code via platform_data for the
3459 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3460 * code needs to add/del initiator dependencies dynamically
3461 * before/after accessing a device. Returns the return value from
3462 * _add_initiator_dep().
3464 * XXX Keep a usecount in the clockdomain code
3466 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
3467 struct omap_hwmod *init_oh)
3469 return _add_initiator_dep(oh, init_oh);
3473 * XXX what about functions for drivers to save/restore ocp_sysconfig
3474 * for context save/restore operations?
3478 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3479 * @oh: struct omap_hwmod *
3480 * @init_oh: struct omap_hwmod * (initiator)
3482 * Remove a sleep dependency between the initiator @init_oh and @oh.
3483 * Intended to be called by DSP/Bridge code via platform_data for the
3484 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3485 * code needs to add/del initiator dependencies dynamically
3486 * before/after accessing a device. Returns the return value from
3487 * _del_initiator_dep().
3489 * XXX Keep a usecount in the clockdomain code
3491 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
3492 struct omap_hwmod *init_oh)
3494 return _del_initiator_dep(oh, init_oh);
3498 * omap_hwmod_enable_wakeup - allow device to wake up the system
3499 * @oh: struct omap_hwmod *
3501 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3502 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3503 * this IP block if it has dynamic mux entries. Eventually this
3504 * should set PRCM wakeup registers to cause the PRCM to receive
3505 * wakeup events from the module. Does not set any wakeup routing
3506 * registers beyond this point - if the module is to wake up any other
3507 * module or subsystem, that must be set separately. Called by
3508 * omap_device code. Returns -EINVAL on error or 0 upon success.
3510 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3512 unsigned long flags;
3515 spin_lock_irqsave(&oh->_lock, flags);
3517 if (oh->class->sysc &&
3518 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3519 v = oh->_sysc_cache;
3520 _enable_wakeup(oh, &v);
3521 _write_sysconfig(v, oh);
3524 _set_idle_ioring_wakeup(oh, true);
3525 spin_unlock_irqrestore(&oh->_lock, flags);
3531 * omap_hwmod_disable_wakeup - prevent device from waking the system
3532 * @oh: struct omap_hwmod *
3534 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3535 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3536 * events for this IP block if it has dynamic mux entries. Eventually
3537 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3538 * wakeup events from the module. Does not set any wakeup routing
3539 * registers beyond this point - if the module is to wake up any other
3540 * module or subsystem, that must be set separately. Called by
3541 * omap_device code. Returns -EINVAL on error or 0 upon success.
3543 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3545 unsigned long flags;
3548 spin_lock_irqsave(&oh->_lock, flags);
3550 if (oh->class->sysc &&
3551 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3552 v = oh->_sysc_cache;
3553 _disable_wakeup(oh, &v);
3554 _write_sysconfig(v, oh);
3557 _set_idle_ioring_wakeup(oh, false);
3558 spin_unlock_irqrestore(&oh->_lock, flags);
3564 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3565 * contained in the hwmod module.
3566 * @oh: struct omap_hwmod *
3567 * @name: name of the reset line to lookup and assert
3569 * Some IP like dsp, ipu or iva contain processor that require
3570 * an HW reset line to be assert / deassert in order to enable fully
3571 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3572 * yet supported on this OMAP; otherwise, passes along the return value
3573 * from _assert_hardreset().
3575 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3578 unsigned long flags;
3583 spin_lock_irqsave(&oh->_lock, flags);
3584 ret = _assert_hardreset(oh, name);
3585 spin_unlock_irqrestore(&oh->_lock, flags);
3591 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3592 * contained in the hwmod module.
3593 * @oh: struct omap_hwmod *
3594 * @name: name of the reset line to look up and deassert
3596 * Some IP like dsp, ipu or iva contain processor that require
3597 * an HW reset line to be assert / deassert in order to enable fully
3598 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3599 * yet supported on this OMAP; otherwise, passes along the return value
3600 * from _deassert_hardreset().
3602 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3605 unsigned long flags;
3610 spin_lock_irqsave(&oh->_lock, flags);
3611 ret = _deassert_hardreset(oh, name);
3612 spin_unlock_irqrestore(&oh->_lock, flags);
3618 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3619 * contained in the hwmod module
3620 * @oh: struct omap_hwmod *
3621 * @name: name of the reset line to look up and read
3623 * Return the current state of the hwmod @oh's reset line named @name:
3624 * returns -EINVAL upon parameter error or if this operation
3625 * is unsupported on the current OMAP; otherwise, passes along the return
3626 * value from _read_hardreset().
3628 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
3631 unsigned long flags;
3636 spin_lock_irqsave(&oh->_lock, flags);
3637 ret = _read_hardreset(oh, name);
3638 spin_unlock_irqrestore(&oh->_lock, flags);
3645 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3646 * @classname: struct omap_hwmod_class name to search for
3647 * @fn: callback function pointer to call for each hwmod in class @classname
3648 * @user: arbitrary context data to pass to the callback function
3650 * For each omap_hwmod of class @classname, call @fn.
3651 * If the callback function returns something other than
3652 * zero, the iterator is terminated, and the callback function's return
3653 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3654 * if @classname or @fn are NULL, or passes back the error code from @fn.
3656 int omap_hwmod_for_each_by_class(const char *classname,
3657 int (*fn)(struct omap_hwmod *oh,
3661 struct omap_hwmod *temp_oh;
3664 if (!classname || !fn)
3667 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3668 __func__, classname);
3670 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3671 if (!strcmp(temp_oh->class->name, classname)) {
3672 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3673 __func__, temp_oh->name);
3674 ret = (*fn)(temp_oh, user);
3681 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3688 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3689 * @oh: struct omap_hwmod *
3690 * @state: state that _setup() should leave the hwmod in
3692 * Sets the hwmod state that @oh will enter at the end of _setup()
3693 * (called by omap_hwmod_setup_*()). See also the documentation
3694 * for _setup_postsetup(), above. Returns 0 upon success or
3695 * -EINVAL if there is a problem with the arguments or if the hwmod is
3696 * in the wrong state.
3698 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3701 unsigned long flags;
3706 if (state != _HWMOD_STATE_DISABLED &&
3707 state != _HWMOD_STATE_ENABLED &&
3708 state != _HWMOD_STATE_IDLE)
3711 spin_lock_irqsave(&oh->_lock, flags);
3713 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3718 oh->_postsetup_state = state;
3722 spin_unlock_irqrestore(&oh->_lock, flags);
3728 * omap_hwmod_get_context_loss_count - get lost context count
3729 * @oh: struct omap_hwmod *
3731 * Query the powerdomain of of @oh to get the context loss
3732 * count for this device.
3734 * Returns the context loss count of the powerdomain assocated with @oh
3735 * upon success, or zero if no powerdomain exists for @oh.
3737 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
3739 struct powerdomain *pwrdm;
3742 pwrdm = omap_hwmod_get_pwrdm(oh);
3744 ret = pwrdm_get_context_loss_count(pwrdm);
3750 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
3751 * @oh: struct omap_hwmod *
3753 * Prevent the hwmod @oh from being reset during the setup process.
3754 * Intended for use by board-*.c files on boards with devices that
3755 * cannot tolerate being reset. Must be called before the hwmod has
3756 * been set up. Returns 0 upon success or negative error code upon
3759 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
3764 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3765 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
3770 oh->flags |= HWMOD_INIT_NO_RESET;
3776 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
3777 * @oh: struct omap_hwmod * containing hwmod mux entries
3778 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
3779 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
3781 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
3782 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
3783 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
3784 * this function is not called for a given pad_idx, then the ISR
3785 * associated with @oh's first MPU IRQ will be triggered when an I/O
3786 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
3787 * the _dynamic or wakeup_ entry: if there are other entries not
3788 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
3789 * entries are NOT COUNTED in the dynamic pad index. This function
3790 * must be called separately for each pad that requires its interrupt
3791 * to be re-routed this way. Returns -EINVAL if there is an argument
3792 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
3793 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
3795 * XXX This function interface is fragile. Rather than using array
3796 * indexes, which are subject to unpredictable change, it should be
3797 * using hwmod IRQ names, and some other stable key for the hwmod mux
3800 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
3806 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
3807 pad_idx >= oh->mux->nr_pads_dynamic)
3810 /* Check the number of available mpu_irqs */
3811 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
3814 if (irq_idx >= nr_irqs)
3817 if (!oh->mux->irqs) {
3818 /* XXX What frees this? */
3819 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
3824 oh->mux->irqs[pad_idx] = irq_idx;
3830 * omap_hwmod_init - initialize the hwmod code
3832 * Sets up some function pointers needed by the hwmod code to operate on the
3833 * currently-booted SoC. Intended to be called once during kernel init
3834 * before any hwmods are registered. No return value.
3836 void __init omap_hwmod_init(void)
3838 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
3839 soc_ops.wait_target_ready = _omap2_wait_target_ready;
3840 soc_ops.assert_hardreset = _omap2_assert_hardreset;
3841 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
3842 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
3843 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
3844 soc_ops.enable_module = _omap4_enable_module;
3845 soc_ops.disable_module = _omap4_disable_module;
3846 soc_ops.wait_target_ready = _omap4_wait_target_ready;
3847 soc_ops.assert_hardreset = _omap4_assert_hardreset;
3848 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
3849 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
3850 soc_ops.init_clkdm = _init_clkdm;
3851 } else if (soc_is_am33xx()) {
3852 soc_ops.enable_module = _am33xx_enable_module;
3853 soc_ops.disable_module = _am33xx_disable_module;
3854 soc_ops.wait_target_ready = _am33xx_wait_target_ready;
3855 soc_ops.assert_hardreset = _am33xx_assert_hardreset;
3856 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
3857 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted;
3858 soc_ops.init_clkdm = _init_clkdm;
3860 WARN(1, "omap_hwmod: unknown SoC type\n");
3867 * omap_hwmod_get_main_clk - get pointer to main clock name
3868 * @oh: struct omap_hwmod *
3870 * Returns the main clock name assocated with @oh upon success,
3871 * or NULL if @oh is NULL.
3873 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
3878 return oh->main_clk;