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-provider.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
141 #include <linux/of.h>
142 #include <linux/of_address.h>
144 #include <asm/system_misc.h>
147 #include "omap_hwmod.h"
151 #include "clockdomain.h"
152 #include "powerdomain.h"
155 #include "cminst44xx.h"
161 #include "prminst44xx.h"
165 /* Name of the OMAP hwmod for the MPU */
166 #define MPU_INITIATOR_NAME "mpu"
169 * Number of struct omap_hwmod_link records per struct
170 * omap_hwmod_ocp_if record (master->slave and slave->master)
172 #define LINKS_PER_OCP_IF 2
175 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
176 * @enable_module: function to enable a module (via MODULEMODE)
177 * @disable_module: function to disable a module (via MODULEMODE)
179 * XXX Eventually this functionality will be hidden inside the PRM/CM
180 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
181 * conditionals in this code.
183 struct omap_hwmod_soc_ops {
184 void (*enable_module)(struct omap_hwmod *oh);
185 int (*disable_module)(struct omap_hwmod *oh);
186 int (*wait_target_ready)(struct omap_hwmod *oh);
187 int (*assert_hardreset)(struct omap_hwmod *oh,
188 struct omap_hwmod_rst_info *ohri);
189 int (*deassert_hardreset)(struct omap_hwmod *oh,
190 struct omap_hwmod_rst_info *ohri);
191 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
192 struct omap_hwmod_rst_info *ohri);
193 int (*init_clkdm)(struct omap_hwmod *oh);
194 void (*update_context_lost)(struct omap_hwmod *oh);
195 int (*get_context_lost)(struct omap_hwmod *oh);
198 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
199 static struct omap_hwmod_soc_ops soc_ops;
201 /* omap_hwmod_list contains all registered struct omap_hwmods */
202 static LIST_HEAD(omap_hwmod_list);
204 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
205 static struct omap_hwmod *mpu_oh;
207 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
208 static DEFINE_SPINLOCK(io_chain_lock);
211 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
212 * allocated from - used to reduce the number of small memory
213 * allocations, which has a significant impact on performance
215 static struct omap_hwmod_link *linkspace;
218 * free_ls, max_ls: array indexes into linkspace; representing the
219 * next free struct omap_hwmod_link index, and the maximum number of
220 * struct omap_hwmod_link records allocated (respectively)
222 static unsigned short free_ls, max_ls, ls_supp;
224 /* inited: set to true once the hwmod code is initialized */
227 /* Private functions */
230 * _fetch_next_ocp_if - return the next OCP interface in a list
231 * @p: ptr to a ptr to the list_head inside the ocp_if to return
232 * @i: pointer to the index of the element pointed to by @p in the list
234 * Return a pointer to the struct omap_hwmod_ocp_if record
235 * containing the struct list_head pointed to by @p, and increment
236 * @p such that a future call to this routine will return the next
239 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
242 struct omap_hwmod_ocp_if *oi;
244 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
253 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
254 * @oh: struct omap_hwmod *
256 * Load the current value of the hwmod OCP_SYSCONFIG register into the
257 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
258 * OCP_SYSCONFIG register or 0 upon success.
260 static int _update_sysc_cache(struct omap_hwmod *oh)
262 if (!oh->class->sysc) {
263 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
267 /* XXX ensure module interface clock is up */
269 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
271 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
272 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
278 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
279 * @v: OCP_SYSCONFIG value to write
280 * @oh: struct omap_hwmod *
282 * Write @v into the module class' OCP_SYSCONFIG register, if it has
283 * one. No return value.
285 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
287 if (!oh->class->sysc) {
288 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
292 /* XXX ensure module interface clock is up */
294 /* Module might have lost context, always update cache and register */
296 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
300 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
301 * @oh: struct omap_hwmod *
302 * @standbymode: MIDLEMODE field bits
303 * @v: pointer to register contents to modify
305 * Update the master standby mode bits in @v to be @standbymode for
306 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
307 * upon error or 0 upon success.
309 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
315 if (!oh->class->sysc ||
316 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
319 if (!oh->class->sysc->sysc_fields) {
320 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
324 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
325 mstandby_mask = (0x3 << mstandby_shift);
327 *v &= ~mstandby_mask;
328 *v |= __ffs(standbymode) << mstandby_shift;
334 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
335 * @oh: struct omap_hwmod *
336 * @idlemode: SIDLEMODE field bits
337 * @v: pointer to register contents to modify
339 * Update the slave idle mode bits in @v to be @idlemode for the @oh
340 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
343 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
348 if (!oh->class->sysc ||
349 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
352 if (!oh->class->sysc->sysc_fields) {
353 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
357 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
358 sidle_mask = (0x3 << sidle_shift);
361 *v |= __ffs(idlemode) << sidle_shift;
367 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
368 * @oh: struct omap_hwmod *
369 * @clockact: CLOCKACTIVITY field bits
370 * @v: pointer to register contents to modify
372 * Update the clockactivity mode bits in @v to be @clockact for the
373 * @oh hwmod. Used for additional powersaving on some modules. Does
374 * not write to the hardware. Returns -EINVAL upon error or 0 upon
377 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
382 if (!oh->class->sysc ||
383 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
386 if (!oh->class->sysc->sysc_fields) {
387 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
391 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
392 clkact_mask = (0x3 << clkact_shift);
395 *v |= clockact << clkact_shift;
401 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
402 * @oh: struct omap_hwmod *
403 * @v: pointer to register contents to modify
405 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
406 * error or 0 upon success.
408 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
412 if (!oh->class->sysc ||
413 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
416 if (!oh->class->sysc->sysc_fields) {
417 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
421 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
429 * _wait_softreset_complete - wait for an OCP softreset to complete
430 * @oh: struct omap_hwmod * to wait on
432 * Wait until the IP block represented by @oh reports that its OCP
433 * softreset is complete. This can be triggered by software (see
434 * _ocp_softreset()) or by hardware upon returning from off-mode (one
435 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
436 * microseconds. Returns the number of microseconds waited.
438 static int _wait_softreset_complete(struct omap_hwmod *oh)
440 struct omap_hwmod_class_sysconfig *sysc;
444 sysc = oh->class->sysc;
446 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
447 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
448 & SYSS_RESETDONE_MASK),
449 MAX_MODULE_SOFTRESET_WAIT, c);
450 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
451 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
452 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
454 MAX_MODULE_SOFTRESET_WAIT, c);
461 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
462 * @oh: struct omap_hwmod *
464 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
465 * of some modules. When the DMA must perform read/write accesses, the
466 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
467 * for power management, software must set the DMADISABLE bit back to 1.
469 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
470 * error or 0 upon success.
472 static int _set_dmadisable(struct omap_hwmod *oh)
477 if (!oh->class->sysc ||
478 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
481 if (!oh->class->sysc->sysc_fields) {
482 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
486 /* clocks must be on for this operation */
487 if (oh->_state != _HWMOD_STATE_ENABLED) {
488 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
492 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
496 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
497 v |= dmadisable_mask;
498 _write_sysconfig(v, oh);
504 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
505 * @oh: struct omap_hwmod *
506 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
507 * @v: pointer to register contents to modify
509 * Update the module autoidle bit in @v to be @autoidle for the @oh
510 * hwmod. The autoidle bit controls whether the module can gate
511 * internal clocks automatically when it isn't doing anything; the
512 * exact function of this bit varies on a per-module basis. This
513 * function does not write to the hardware. Returns -EINVAL upon
514 * error or 0 upon success.
516 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
522 if (!oh->class->sysc ||
523 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
526 if (!oh->class->sysc->sysc_fields) {
527 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
531 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
532 autoidle_mask = (0x1 << autoidle_shift);
534 *v &= ~autoidle_mask;
535 *v |= autoidle << autoidle_shift;
541 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
542 * @oh: struct omap_hwmod *
543 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
545 * Set or clear the I/O pad wakeup flag in the mux entries for the
546 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
547 * in memory. If the hwmod is currently idled, and the new idle
548 * values don't match the previous ones, this function will also
549 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
550 * currently idled, this function won't touch the hardware: the new
551 * mux settings are written to the SCM PADCTRL registers when the
552 * hwmod is idled. No return value.
554 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
556 struct omap_device_pad *pad;
561 if (!oh->mux || !oh->mux->enabled)
564 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
565 pad = oh->mux->pads_dynamic[j];
567 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
570 prev_idle = pad->idle;
573 pad->idle |= OMAP_WAKEUP_EN;
575 pad->idle &= ~OMAP_WAKEUP_EN;
577 if (prev_idle != pad->idle)
581 if (change && oh->_state == _HWMOD_STATE_IDLE)
582 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
586 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
587 * @oh: struct omap_hwmod *
589 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
590 * upon error or 0 upon success.
592 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
594 if (!oh->class->sysc ||
595 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
596 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
597 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
600 if (!oh->class->sysc->sysc_fields) {
601 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
605 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
606 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
608 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
609 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
610 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
611 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
613 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
619 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
620 * @oh: struct omap_hwmod *
622 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
623 * upon error or 0 upon success.
625 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
627 if (!oh->class->sysc ||
628 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
629 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
630 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
633 if (!oh->class->sysc->sysc_fields) {
634 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
638 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
639 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
641 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
642 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
643 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
644 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
646 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
651 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
653 struct clk_hw_omap *clk;
657 } else if (oh->_clk) {
658 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
665 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
666 * @oh: struct omap_hwmod *
668 * Prevent the hardware module @oh from entering idle while the
669 * hardare module initiator @init_oh is active. Useful when a module
670 * will be accessed by a particular initiator (e.g., if a module will
671 * be accessed by the IVA, there should be a sleepdep between the IVA
672 * initiator and the module). Only applies to modules in smart-idle
673 * mode. If the clockdomain is marked as not needing autodeps, return
674 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
675 * passes along clkdm_add_sleepdep() value upon success.
677 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
679 struct clockdomain *clkdm, *init_clkdm;
681 clkdm = _get_clkdm(oh);
682 init_clkdm = _get_clkdm(init_oh);
684 if (!clkdm || !init_clkdm)
687 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
690 return clkdm_add_sleepdep(clkdm, init_clkdm);
694 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
695 * @oh: struct omap_hwmod *
697 * Allow the hardware module @oh to enter idle while the hardare
698 * module initiator @init_oh is active. Useful when a module will not
699 * be accessed by a particular initiator (e.g., if a module will not
700 * be accessed by the IVA, there should be no sleepdep between the IVA
701 * initiator and the module). Only applies to modules in smart-idle
702 * mode. If the clockdomain is marked as not needing autodeps, return
703 * 0 without doing anything. Returns -EINVAL upon error or passes
704 * along clkdm_del_sleepdep() value upon success.
706 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
708 struct clockdomain *clkdm, *init_clkdm;
710 clkdm = _get_clkdm(oh);
711 init_clkdm = _get_clkdm(init_oh);
713 if (!clkdm || !init_clkdm)
716 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
719 return clkdm_del_sleepdep(clkdm, init_clkdm);
723 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
724 * @oh: struct omap_hwmod *
726 * Called from _init_clocks(). Populates the @oh _clk (main
727 * functional clock pointer) if a main_clk is present. Returns 0 on
728 * success or -EINVAL on error.
730 static int _init_main_clk(struct omap_hwmod *oh)
737 oh->_clk = clk_get(NULL, oh->main_clk);
738 if (IS_ERR(oh->_clk)) {
739 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
740 oh->name, oh->main_clk);
744 * HACK: This needs a re-visit once clk_prepare() is implemented
745 * to do something meaningful. Today its just a no-op.
746 * If clk_prepare() is used at some point to do things like
747 * voltage scaling etc, then this would have to be moved to
748 * some point where subsystems like i2c and pmic become
751 clk_prepare(oh->_clk);
754 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
755 oh->name, oh->main_clk);
761 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
762 * @oh: struct omap_hwmod *
764 * Called from _init_clocks(). Populates the @oh OCP slave interface
765 * clock pointers. Returns 0 on success or -EINVAL on error.
767 static int _init_interface_clks(struct omap_hwmod *oh)
769 struct omap_hwmod_ocp_if *os;
775 p = oh->slave_ports.next;
777 while (i < oh->slaves_cnt) {
778 os = _fetch_next_ocp_if(&p, &i);
782 c = clk_get(NULL, os->clk);
784 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
790 * HACK: This needs a re-visit once clk_prepare() is implemented
791 * to do something meaningful. Today its just a no-op.
792 * If clk_prepare() is used at some point to do things like
793 * voltage scaling etc, then this would have to be moved to
794 * some point where subsystems like i2c and pmic become
797 clk_prepare(os->_clk);
804 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
805 * @oh: struct omap_hwmod *
807 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
808 * clock pointers. Returns 0 on success or -EINVAL on error.
810 static int _init_opt_clks(struct omap_hwmod *oh)
812 struct omap_hwmod_opt_clk *oc;
817 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
818 c = clk_get(NULL, oc->clk);
820 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
826 * HACK: This needs a re-visit once clk_prepare() is implemented
827 * to do something meaningful. Today its just a no-op.
828 * If clk_prepare() is used at some point to do things like
829 * voltage scaling etc, then this would have to be moved to
830 * some point where subsystems like i2c and pmic become
833 clk_prepare(oc->_clk);
840 * _enable_clocks - enable hwmod main clock and interface clocks
841 * @oh: struct omap_hwmod *
843 * Enables all clocks necessary for register reads and writes to succeed
844 * on the hwmod @oh. Returns 0.
846 static int _enable_clocks(struct omap_hwmod *oh)
848 struct omap_hwmod_ocp_if *os;
852 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
855 clk_enable(oh->_clk);
857 p = oh->slave_ports.next;
859 while (i < oh->slaves_cnt) {
860 os = _fetch_next_ocp_if(&p, &i);
862 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
863 clk_enable(os->_clk);
866 /* The opt clocks are controlled by the device driver. */
872 * _disable_clocks - disable hwmod main clock and interface clocks
873 * @oh: struct omap_hwmod *
875 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
877 static int _disable_clocks(struct omap_hwmod *oh)
879 struct omap_hwmod_ocp_if *os;
883 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
886 clk_disable(oh->_clk);
888 p = oh->slave_ports.next;
890 while (i < oh->slaves_cnt) {
891 os = _fetch_next_ocp_if(&p, &i);
893 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
894 clk_disable(os->_clk);
897 /* The opt clocks are controlled by the device driver. */
902 static void _enable_optional_clocks(struct omap_hwmod *oh)
904 struct omap_hwmod_opt_clk *oc;
907 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
909 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
911 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
912 __clk_get_name(oc->_clk));
913 clk_enable(oc->_clk);
917 static void _disable_optional_clocks(struct omap_hwmod *oh)
919 struct omap_hwmod_opt_clk *oc;
922 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
924 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
926 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
927 __clk_get_name(oc->_clk));
928 clk_disable(oc->_clk);
933 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
934 * @oh: struct omap_hwmod *
936 * Enables the PRCM module mode related to the hwmod @oh.
939 static void _omap4_enable_module(struct omap_hwmod *oh)
941 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
944 pr_debug("omap_hwmod: %s: %s: %d\n",
945 oh->name, __func__, oh->prcm.omap4.modulemode);
947 omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
948 oh->clkdm->prcm_partition,
950 oh->clkdm->clkdm_offs,
951 oh->prcm.omap4.clkctrl_offs);
955 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
956 * @oh: struct omap_hwmod *
958 * Enables the PRCM module mode related to the hwmod @oh.
961 static void _am33xx_enable_module(struct omap_hwmod *oh)
963 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
966 pr_debug("omap_hwmod: %s: %s: %d\n",
967 oh->name, __func__, oh->prcm.omap4.modulemode);
969 am33xx_cm_module_enable(oh->prcm.omap4.modulemode, oh->clkdm->cm_inst,
970 oh->clkdm->clkdm_offs,
971 oh->prcm.omap4.clkctrl_offs);
975 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
976 * @oh: struct omap_hwmod *
978 * Wait for a module @oh to enter slave idle. Returns 0 if the module
979 * does not have an IDLEST bit or if the module successfully enters
980 * slave idle; otherwise, pass along the return value of the
981 * appropriate *_cm*_wait_module_idle() function.
983 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
988 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
991 if (oh->flags & HWMOD_NO_IDLEST)
994 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
996 oh->clkdm->clkdm_offs,
997 oh->prcm.omap4.clkctrl_offs);
1001 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
1002 * @oh: struct omap_hwmod *
1004 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1005 * does not have an IDLEST bit or if the module successfully enters
1006 * slave idle; otherwise, pass along the return value of the
1007 * appropriate *_cm*_wait_module_idle() function.
1009 static int _am33xx_wait_target_disable(struct omap_hwmod *oh)
1014 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1017 if (oh->flags & HWMOD_NO_IDLEST)
1020 return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst,
1021 oh->clkdm->clkdm_offs,
1022 oh->prcm.omap4.clkctrl_offs);
1026 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1027 * @oh: struct omap_hwmod *oh
1029 * Count and return the number of MPU IRQs associated with the hwmod
1030 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1033 static int _count_mpu_irqs(struct omap_hwmod *oh)
1035 struct omap_hwmod_irq_info *ohii;
1038 if (!oh || !oh->mpu_irqs)
1042 ohii = &oh->mpu_irqs[i++];
1043 } while (ohii->irq != -1);
1049 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1050 * @oh: struct omap_hwmod *oh
1052 * Count and return the number of SDMA request lines associated with
1053 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1056 static int _count_sdma_reqs(struct omap_hwmod *oh)
1058 struct omap_hwmod_dma_info *ohdi;
1061 if (!oh || !oh->sdma_reqs)
1065 ohdi = &oh->sdma_reqs[i++];
1066 } while (ohdi->dma_req != -1);
1072 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1073 * @oh: struct omap_hwmod *oh
1075 * Count and return the number of address space ranges associated with
1076 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1079 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1081 struct omap_hwmod_addr_space *mem;
1084 if (!os || !os->addr)
1088 mem = &os->addr[i++];
1089 } while (mem->pa_start != mem->pa_end);
1095 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1096 * @oh: struct omap_hwmod * to operate on
1097 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1098 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1100 * Retrieve a MPU hardware IRQ line number named by @name associated
1101 * with the IP block pointed to by @oh. The IRQ number will be filled
1102 * into the address pointed to by @dma. When @name is non-null, the
1103 * IRQ line number associated with the named entry will be returned.
1104 * If @name is null, the first matching entry will be returned. Data
1105 * order is not meaningful in hwmod data, so callers are strongly
1106 * encouraged to use a non-null @name whenever possible to avoid
1107 * unpredictable effects if hwmod data is later added that causes data
1108 * ordering to change. Returns 0 upon success or a negative error
1111 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1121 while (oh->mpu_irqs[i].irq != -1) {
1122 if (name == oh->mpu_irqs[i].name ||
1123 !strcmp(name, oh->mpu_irqs[i].name)) {
1133 *irq = oh->mpu_irqs[i].irq;
1139 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1140 * @oh: struct omap_hwmod * to operate on
1141 * @name: pointer to the name of the SDMA request line to fetch (optional)
1142 * @dma: pointer to an unsigned int to store the request line ID to
1144 * Retrieve an SDMA request line ID named by @name on the IP block
1145 * pointed to by @oh. The ID will be filled into the address pointed
1146 * to by @dma. When @name is non-null, the request line ID associated
1147 * with the named entry will be returned. If @name is null, the first
1148 * matching entry will be returned. Data order is not meaningful in
1149 * hwmod data, so callers are strongly encouraged to use a non-null
1150 * @name whenever possible to avoid unpredictable effects if hwmod
1151 * data is later added that causes data ordering to change. Returns 0
1152 * upon success or a negative error code upon error.
1154 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1164 while (oh->sdma_reqs[i].dma_req != -1) {
1165 if (name == oh->sdma_reqs[i].name ||
1166 !strcmp(name, oh->sdma_reqs[i].name)) {
1176 *dma = oh->sdma_reqs[i].dma_req;
1182 * _get_addr_space_by_name - fetch address space start & end by name
1183 * @oh: struct omap_hwmod * to operate on
1184 * @name: pointer to the name of the address space to fetch (optional)
1185 * @pa_start: pointer to a u32 to store the starting address to
1186 * @pa_end: pointer to a u32 to store the ending address to
1188 * Retrieve address space start and end addresses for the IP block
1189 * pointed to by @oh. The data will be filled into the addresses
1190 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1191 * address space data associated with the named entry will be
1192 * returned. If @name is null, the first matching entry will be
1193 * returned. Data order is not meaningful in hwmod data, so callers
1194 * are strongly encouraged to use a non-null @name whenever possible
1195 * to avoid unpredictable effects if hwmod data is later added that
1196 * causes data ordering to change. Returns 0 upon success or a
1197 * negative error code upon error.
1199 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1200 u32 *pa_start, u32 *pa_end)
1203 struct omap_hwmod_ocp_if *os;
1204 struct list_head *p = NULL;
1207 p = oh->slave_ports.next;
1210 while (i < oh->slaves_cnt) {
1211 os = _fetch_next_ocp_if(&p, &i);
1217 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1218 if (name == os->addr[j].name ||
1219 !strcmp(name, os->addr[j].name)) {
1233 *pa_start = os->addr[j].pa_start;
1234 *pa_end = os->addr[j].pa_end;
1240 * _save_mpu_port_index - find and save the index to @oh's MPU port
1241 * @oh: struct omap_hwmod *
1243 * Determines the array index of the OCP slave port that the MPU uses
1244 * to address the device, and saves it into the struct omap_hwmod.
1245 * Intended to be called during hwmod registration only. No return
1248 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1250 struct omap_hwmod_ocp_if *os = NULL;
1251 struct list_head *p;
1257 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1259 p = oh->slave_ports.next;
1261 while (i < oh->slaves_cnt) {
1262 os = _fetch_next_ocp_if(&p, &i);
1263 if (os->user & OCP_USER_MPU) {
1265 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1274 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1275 * @oh: struct omap_hwmod *
1277 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1278 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1279 * communicate with the IP block. This interface need not be directly
1280 * connected to the MPU (and almost certainly is not), but is directly
1281 * connected to the IP block represented by @oh. Returns a pointer
1282 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1283 * error or if there does not appear to be a path from the MPU to this
1286 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1288 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1291 return oh->_mpu_port;
1295 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1296 * @oh: struct omap_hwmod *
1298 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1299 * the register target MPU address space; or returns NULL upon error.
1301 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1303 struct omap_hwmod_ocp_if *os;
1304 struct omap_hwmod_addr_space *mem;
1305 int found = 0, i = 0;
1307 os = _find_mpu_rt_port(oh);
1308 if (!os || !os->addr)
1312 mem = &os->addr[i++];
1313 if (mem->flags & ADDR_TYPE_RT)
1315 } while (!found && mem->pa_start != mem->pa_end);
1317 return (found) ? mem : NULL;
1321 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1322 * @oh: struct omap_hwmod *
1324 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1325 * by @oh is set to indicate to the PRCM that the IP block is active.
1326 * Usually this means placing the module into smart-idle mode and
1327 * smart-standby, but if there is a bug in the automatic idle handling
1328 * for the IP block, it may need to be placed into the force-idle or
1329 * no-idle variants of these modes. No return value.
1331 static void _enable_sysc(struct omap_hwmod *oh)
1336 struct clockdomain *clkdm;
1338 if (!oh->class->sysc)
1342 * Wait until reset has completed, this is needed as the IP
1343 * block is reset automatically by hardware in some cases
1344 * (off-mode for example), and the drivers require the
1345 * IP to be ready when they access it
1347 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1348 _enable_optional_clocks(oh);
1349 _wait_softreset_complete(oh);
1350 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1351 _disable_optional_clocks(oh);
1353 v = oh->_sysc_cache;
1354 sf = oh->class->sysc->sysc_flags;
1356 clkdm = _get_clkdm(oh);
1357 if (sf & SYSC_HAS_SIDLEMODE) {
1358 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1359 if (clkdm_act && !(oh->class->sysc->idlemodes &
1360 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1361 idlemode = HWMOD_IDLEMODE_FORCE;
1363 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
1364 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
1365 _set_slave_idlemode(oh, idlemode, &v);
1368 if (sf & SYSC_HAS_MIDLEMODE) {
1369 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1370 idlemode = HWMOD_IDLEMODE_NO;
1372 if (sf & SYSC_HAS_ENAWAKEUP)
1373 _enable_wakeup(oh, &v);
1374 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1375 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1377 idlemode = HWMOD_IDLEMODE_SMART;
1379 _set_master_standbymode(oh, idlemode, &v);
1383 * XXX The clock framework should handle this, by
1384 * calling into this code. But this must wait until the
1385 * clock structures are tagged with omap_hwmod entries
1387 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1388 (sf & SYSC_HAS_CLOCKACTIVITY))
1389 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1391 /* If slave is in SMARTIDLE, also enable wakeup */
1392 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1393 _enable_wakeup(oh, &v);
1395 _write_sysconfig(v, oh);
1398 * Set the autoidle bit only after setting the smartidle bit
1399 * Setting this will not have any impact on the other modules.
1401 if (sf & SYSC_HAS_AUTOIDLE) {
1402 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1404 _set_module_autoidle(oh, idlemode, &v);
1405 _write_sysconfig(v, oh);
1410 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1411 * @oh: struct omap_hwmod *
1413 * If module is marked as SWSUP_SIDLE, force the module into slave
1414 * idle; otherwise, configure it for smart-idle. If module is marked
1415 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1416 * configure it for smart-standby. No return value.
1418 static void _idle_sysc(struct omap_hwmod *oh)
1423 if (!oh->class->sysc)
1426 v = oh->_sysc_cache;
1427 sf = oh->class->sysc->sysc_flags;
1429 if (sf & SYSC_HAS_SIDLEMODE) {
1430 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1431 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1432 !(oh->class->sysc->idlemodes &
1433 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1434 idlemode = HWMOD_IDLEMODE_FORCE;
1436 idlemode = HWMOD_IDLEMODE_SMART;
1437 _set_slave_idlemode(oh, idlemode, &v);
1440 if (sf & SYSC_HAS_MIDLEMODE) {
1441 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1442 idlemode = HWMOD_IDLEMODE_FORCE;
1444 if (sf & SYSC_HAS_ENAWAKEUP)
1445 _enable_wakeup(oh, &v);
1446 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1447 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1449 idlemode = HWMOD_IDLEMODE_SMART;
1451 _set_master_standbymode(oh, idlemode, &v);
1454 /* If slave is in SMARTIDLE, also enable wakeup */
1455 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1456 _enable_wakeup(oh, &v);
1458 _write_sysconfig(v, oh);
1462 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1463 * @oh: struct omap_hwmod *
1465 * Force the module into slave idle and master suspend. No return
1468 static void _shutdown_sysc(struct omap_hwmod *oh)
1473 if (!oh->class->sysc)
1476 v = oh->_sysc_cache;
1477 sf = oh->class->sysc->sysc_flags;
1479 if (sf & SYSC_HAS_SIDLEMODE)
1480 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1482 if (sf & SYSC_HAS_MIDLEMODE)
1483 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1485 if (sf & SYSC_HAS_AUTOIDLE)
1486 _set_module_autoidle(oh, 1, &v);
1488 _write_sysconfig(v, oh);
1492 * _lookup - find an omap_hwmod by name
1493 * @name: find an omap_hwmod by name
1495 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1497 static struct omap_hwmod *_lookup(const char *name)
1499 struct omap_hwmod *oh, *temp_oh;
1503 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1504 if (!strcmp(name, temp_oh->name)) {
1514 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1515 * @oh: struct omap_hwmod *
1517 * Convert a clockdomain name stored in a struct omap_hwmod into a
1518 * clockdomain pointer, and save it into the struct omap_hwmod.
1519 * Return -EINVAL if the clkdm_name lookup failed.
1521 static int _init_clkdm(struct omap_hwmod *oh)
1523 if (!oh->clkdm_name) {
1524 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1528 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1530 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1531 oh->name, oh->clkdm_name);
1535 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1536 oh->name, oh->clkdm_name);
1542 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1543 * well the clockdomain.
1544 * @oh: struct omap_hwmod *
1545 * @data: not used; pass NULL
1547 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1548 * Resolves all clock names embedded in the hwmod. Returns 0 on
1549 * success, or a negative error code on failure.
1551 static int _init_clocks(struct omap_hwmod *oh, void *data)
1555 if (oh->_state != _HWMOD_STATE_REGISTERED)
1558 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1560 if (soc_ops.init_clkdm)
1561 ret |= soc_ops.init_clkdm(oh);
1563 ret |= _init_main_clk(oh);
1564 ret |= _init_interface_clks(oh);
1565 ret |= _init_opt_clks(oh);
1568 oh->_state = _HWMOD_STATE_CLKS_INITED;
1570 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1576 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1577 * @oh: struct omap_hwmod *
1578 * @name: name of the reset line in the context of this hwmod
1579 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1581 * Return the bit position of the reset line that match the
1582 * input name. Return -ENOENT if not found.
1584 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1585 struct omap_hwmod_rst_info *ohri)
1589 for (i = 0; i < oh->rst_lines_cnt; i++) {
1590 const char *rst_line = oh->rst_lines[i].name;
1591 if (!strcmp(rst_line, name)) {
1592 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1593 ohri->st_shift = oh->rst_lines[i].st_shift;
1594 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1595 oh->name, __func__, rst_line, ohri->rst_shift,
1606 * _assert_hardreset - assert the HW reset line of submodules
1607 * contained in the hwmod module.
1608 * @oh: struct omap_hwmod *
1609 * @name: name of the reset line to lookup and assert
1611 * Some IP like dsp, ipu or iva contain processor that require an HW
1612 * reset line to be assert / deassert in order to enable fully the IP.
1613 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1614 * asserting the hardreset line on the currently-booted SoC, or passes
1615 * along the return value from _lookup_hardreset() or the SoC's
1616 * assert_hardreset code.
1618 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1620 struct omap_hwmod_rst_info ohri;
1626 if (!soc_ops.assert_hardreset)
1629 ret = _lookup_hardreset(oh, name, &ohri);
1633 ret = soc_ops.assert_hardreset(oh, &ohri);
1639 * _deassert_hardreset - deassert the HW reset line of submodules contained
1640 * in the hwmod module.
1641 * @oh: struct omap_hwmod *
1642 * @name: name of the reset line to look up and deassert
1644 * Some IP like dsp, ipu or iva contain processor that require an HW
1645 * reset line to be assert / deassert in order to enable fully the IP.
1646 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1647 * deasserting the hardreset line on the currently-booted SoC, or passes
1648 * along the return value from _lookup_hardreset() or the SoC's
1649 * deassert_hardreset code.
1651 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1653 struct omap_hwmod_rst_info ohri;
1660 if (!soc_ops.deassert_hardreset)
1663 ret = _lookup_hardreset(oh, name, &ohri);
1664 if (IS_ERR_VALUE(ret))
1669 * A clockdomain must be in SW_SUP otherwise reset
1670 * might not be completed. The clockdomain can be set
1671 * in HW_AUTO only when the module become ready.
1673 hwsup = clkdm_in_hwsup(oh->clkdm);
1674 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1676 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1677 oh->name, oh->clkdm->name, ret);
1683 if (soc_ops.enable_module)
1684 soc_ops.enable_module(oh);
1686 ret = soc_ops.deassert_hardreset(oh, &ohri);
1688 if (soc_ops.disable_module)
1689 soc_ops.disable_module(oh);
1690 _disable_clocks(oh);
1693 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1697 * Set the clockdomain to HW_AUTO, assuming that the
1698 * previous state was HW_AUTO.
1700 if (oh->clkdm && hwsup)
1701 clkdm_allow_idle(oh->clkdm);
1704 clkdm_hwmod_disable(oh->clkdm, oh);
1711 * _read_hardreset - read the HW reset line state of submodules
1712 * contained in the hwmod module
1713 * @oh: struct omap_hwmod *
1714 * @name: name of the reset line to look up and read
1716 * Return the state of the reset line. Returns -EINVAL if @oh is
1717 * null, -ENOSYS if we have no way of reading the hardreset line
1718 * status on the currently-booted SoC, or passes along the return
1719 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1722 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1724 struct omap_hwmod_rst_info ohri;
1730 if (!soc_ops.is_hardreset_asserted)
1733 ret = _lookup_hardreset(oh, name, &ohri);
1737 return soc_ops.is_hardreset_asserted(oh, &ohri);
1741 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1742 * @oh: struct omap_hwmod *
1744 * If all hardreset lines associated with @oh are asserted, then return true.
1745 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1746 * associated with @oh are asserted, then return false.
1747 * This function is used to avoid executing some parts of the IP block
1748 * enable/disable sequence if its hardreset line is set.
1750 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1754 if (oh->rst_lines_cnt == 0)
1757 for (i = 0; i < oh->rst_lines_cnt; i++)
1758 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1761 if (oh->rst_lines_cnt == rst_cnt)
1768 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1770 * @oh: struct omap_hwmod *
1772 * If any hardreset lines associated with @oh are asserted, then
1773 * return true. Otherwise, if no hardreset lines associated with @oh
1774 * are asserted, or if @oh has no hardreset lines, then return false.
1775 * This function is used to avoid executing some parts of the IP block
1776 * enable/disable sequence if any hardreset line is set.
1778 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1783 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1784 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1787 return (rst_cnt) ? true : false;
1791 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1792 * @oh: struct omap_hwmod *
1794 * Disable the PRCM module mode related to the hwmod @oh.
1795 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1797 static int _omap4_disable_module(struct omap_hwmod *oh)
1801 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1805 * Since integration code might still be doing something, only
1806 * disable if all lines are under hardreset.
1808 if (_are_any_hardreset_lines_asserted(oh))
1811 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1813 omap4_cminst_module_disable(oh->clkdm->prcm_partition,
1815 oh->clkdm->clkdm_offs,
1816 oh->prcm.omap4.clkctrl_offs);
1818 v = _omap4_wait_target_disable(oh);
1820 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1827 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1828 * @oh: struct omap_hwmod *
1830 * Disable the PRCM module mode related to the hwmod @oh.
1831 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1833 static int _am33xx_disable_module(struct omap_hwmod *oh)
1837 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1840 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1842 if (_are_any_hardreset_lines_asserted(oh))
1845 am33xx_cm_module_disable(oh->clkdm->cm_inst, oh->clkdm->clkdm_offs,
1846 oh->prcm.omap4.clkctrl_offs);
1848 v = _am33xx_wait_target_disable(oh);
1850 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1857 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1858 * @oh: struct omap_hwmod *
1860 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1861 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1862 * reset this way, -EINVAL if the hwmod is in the wrong state,
1863 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1865 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1866 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1867 * use the SYSCONFIG softreset bit to provide the status.
1869 * Note that some IP like McBSP do have reset control but don't have
1872 static int _ocp_softreset(struct omap_hwmod *oh)
1878 if (!oh->class->sysc ||
1879 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1882 /* clocks must be on for this operation */
1883 if (oh->_state != _HWMOD_STATE_ENABLED) {
1884 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1889 /* For some modules, all optionnal clocks need to be enabled as well */
1890 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1891 _enable_optional_clocks(oh);
1893 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1895 v = oh->_sysc_cache;
1896 ret = _set_softreset(oh, &v);
1899 _write_sysconfig(v, oh);
1901 if (oh->class->sysc->srst_udelay)
1902 udelay(oh->class->sysc->srst_udelay);
1904 c = _wait_softreset_complete(oh);
1905 if (c == MAX_MODULE_SOFTRESET_WAIT)
1906 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1907 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1909 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1912 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1913 * _wait_target_ready() or _reset()
1916 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1919 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1920 _disable_optional_clocks(oh);
1926 * _reset - reset an omap_hwmod
1927 * @oh: struct omap_hwmod *
1929 * Resets an omap_hwmod @oh. If the module has a custom reset
1930 * function pointer defined, then call it to reset the IP block, and
1931 * pass along its return value to the caller. Otherwise, if the IP
1932 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1933 * associated with it, call a function to reset the IP block via that
1934 * method, and pass along the return value to the caller. Finally, if
1935 * the IP block has some hardreset lines associated with it, assert
1936 * all of those, but do _not_ deassert them. (This is because driver
1937 * authors have expressed an apparent requirement to control the
1938 * deassertion of the hardreset lines themselves.)
1940 * The default software reset mechanism for most OMAP IP blocks is
1941 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1942 * hwmods cannot be reset via this method. Some are not targets and
1943 * therefore have no OCP header registers to access. Others (like the
1944 * IVA) have idiosyncratic reset sequences. So for these relatively
1945 * rare cases, custom reset code can be supplied in the struct
1946 * omap_hwmod_class .reset function pointer.
1948 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1949 * does not prevent idling of the system. This is necessary for cases
1950 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1951 * kernel without disabling dma.
1953 * Passes along the return value from either _ocp_softreset() or the
1954 * custom reset function - these must return -EINVAL if the hwmod
1955 * cannot be reset this way or if the hwmod is in the wrong state,
1956 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1958 static int _reset(struct omap_hwmod *oh)
1962 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1964 if (oh->class->reset) {
1965 r = oh->class->reset(oh);
1967 if (oh->rst_lines_cnt > 0) {
1968 for (i = 0; i < oh->rst_lines_cnt; i++)
1969 _assert_hardreset(oh, oh->rst_lines[i].name);
1972 r = _ocp_softreset(oh);
1978 _set_dmadisable(oh);
1981 * OCP_SYSCONFIG bits need to be reprogrammed after a
1982 * softreset. The _enable() function should be split to avoid
1983 * the rewrite of the OCP_SYSCONFIG register.
1985 if (oh->class->sysc) {
1986 _update_sysc_cache(oh);
1994 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1996 * Call the appropriate PRM function to clear any logged I/O chain
1997 * wakeups and to reconfigure the chain. This apparently needs to be
1998 * done upon every mux change. Since hwmods can be concurrently
1999 * enabled and idled, hold a spinlock around the I/O chain
2000 * reconfiguration sequence. No return value.
2002 * XXX When the PRM code is moved to drivers, this function can be removed,
2003 * as the PRM infrastructure should abstract this.
2005 static void _reconfigure_io_chain(void)
2007 unsigned long flags;
2009 spin_lock_irqsave(&io_chain_lock, flags);
2011 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
2012 omap3xxx_prm_reconfigure_io_chain();
2013 else if (cpu_is_omap44xx())
2014 omap44xx_prm_reconfigure_io_chain();
2016 spin_unlock_irqrestore(&io_chain_lock, flags);
2020 * _omap4_update_context_lost - increment hwmod context loss counter if
2021 * hwmod context was lost, and clear hardware context loss reg
2022 * @oh: hwmod to check for context loss
2024 * If the PRCM indicates that the hwmod @oh lost context, increment
2025 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2026 * bits. No return value.
2028 static void _omap4_update_context_lost(struct omap_hwmod *oh)
2030 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
2033 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2034 oh->clkdm->pwrdm.ptr->prcm_offs,
2035 oh->prcm.omap4.context_offs))
2038 oh->prcm.omap4.context_lost_counter++;
2039 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2040 oh->clkdm->pwrdm.ptr->prcm_offs,
2041 oh->prcm.omap4.context_offs);
2045 * _omap4_get_context_lost - get context loss counter for a hwmod
2046 * @oh: hwmod to get context loss counter for
2048 * Returns the in-memory context loss counter for a hwmod.
2050 static int _omap4_get_context_lost(struct omap_hwmod *oh)
2052 return oh->prcm.omap4.context_lost_counter;
2056 * _enable_preprogram - Pre-program an IP block during the _enable() process
2057 * @oh: struct omap_hwmod *
2059 * Some IP blocks (such as AESS) require some additional programming
2060 * after enable before they can enter idle. If a function pointer to
2061 * do so is present in the hwmod data, then call it and pass along the
2062 * return value; otherwise, return 0.
2064 static int __init _enable_preprogram(struct omap_hwmod *oh)
2066 if (!oh->class->enable_preprogram)
2069 return oh->class->enable_preprogram(oh);
2073 * _enable - enable an omap_hwmod
2074 * @oh: struct omap_hwmod *
2076 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2077 * register target. Returns -EINVAL if the hwmod is in the wrong
2078 * state or passes along the return value of _wait_target_ready().
2080 static int _enable(struct omap_hwmod *oh)
2085 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2088 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2089 * state at init. Now that someone is really trying to enable
2090 * them, just ensure that the hwmod mux is set.
2092 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2094 * If the caller has mux data populated, do the mux'ing
2095 * which wouldn't have been done as part of the _enable()
2096 * done during setup.
2099 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2101 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2105 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2106 oh->_state != _HWMOD_STATE_IDLE &&
2107 oh->_state != _HWMOD_STATE_DISABLED) {
2108 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2114 * If an IP block contains HW reset lines and all of them are
2115 * asserted, we let integration code associated with that
2116 * block handle the enable. We've received very little
2117 * information on what those driver authors need, and until
2118 * detailed information is provided and the driver code is
2119 * posted to the public lists, this is probably the best we
2122 if (_are_all_hardreset_lines_asserted(oh))
2125 /* Mux pins for device runtime if populated */
2126 if (oh->mux && (!oh->mux->enabled ||
2127 ((oh->_state == _HWMOD_STATE_IDLE) &&
2128 oh->mux->pads_dynamic))) {
2129 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2130 _reconfigure_io_chain();
2133 _add_initiator_dep(oh, mpu_oh);
2137 * A clockdomain must be in SW_SUP before enabling
2138 * completely the module. The clockdomain can be set
2139 * in HW_AUTO only when the module become ready.
2141 hwsup = clkdm_in_hwsup(oh->clkdm) &&
2142 !clkdm_missing_idle_reporting(oh->clkdm);
2143 r = clkdm_hwmod_enable(oh->clkdm, oh);
2145 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2146 oh->name, oh->clkdm->name, r);
2152 if (soc_ops.enable_module)
2153 soc_ops.enable_module(oh);
2154 if (oh->flags & HWMOD_BLOCK_WFI)
2157 if (soc_ops.update_context_lost)
2158 soc_ops.update_context_lost(oh);
2160 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2164 * Set the clockdomain to HW_AUTO only if the target is ready,
2165 * assuming that the previous state was HW_AUTO
2167 if (oh->clkdm && hwsup)
2168 clkdm_allow_idle(oh->clkdm);
2170 oh->_state = _HWMOD_STATE_ENABLED;
2172 /* Access the sysconfig only if the target is ready */
2173 if (oh->class->sysc) {
2174 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2175 _update_sysc_cache(oh);
2178 r = _enable_preprogram(oh);
2180 if (soc_ops.disable_module)
2181 soc_ops.disable_module(oh);
2182 _disable_clocks(oh);
2183 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2187 clkdm_hwmod_disable(oh->clkdm, oh);
2194 * _idle - idle an omap_hwmod
2195 * @oh: struct omap_hwmod *
2197 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2198 * no further work. Returns -EINVAL if the hwmod is in the wrong
2199 * state or returns 0.
2201 static int _idle(struct omap_hwmod *oh)
2203 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2205 if (oh->_state != _HWMOD_STATE_ENABLED) {
2206 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2211 if (_are_all_hardreset_lines_asserted(oh))
2214 if (oh->class->sysc)
2216 _del_initiator_dep(oh, mpu_oh);
2218 if (oh->flags & HWMOD_BLOCK_WFI)
2220 if (soc_ops.disable_module)
2221 soc_ops.disable_module(oh);
2224 * The module must be in idle mode before disabling any parents
2225 * clocks. Otherwise, the parent clock might be disabled before
2226 * the module transition is done, and thus will prevent the
2227 * transition to complete properly.
2229 _disable_clocks(oh);
2231 clkdm_hwmod_disable(oh->clkdm, oh);
2233 /* Mux pins for device idle if populated */
2234 if (oh->mux && oh->mux->pads_dynamic) {
2235 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2236 _reconfigure_io_chain();
2239 oh->_state = _HWMOD_STATE_IDLE;
2245 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2246 * @oh: struct omap_hwmod *
2247 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2249 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2250 * local copy. Intended to be used by drivers that require
2251 * direct manipulation of the AUTOIDLE bits.
2252 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2253 * along the return value from _set_module_autoidle().
2255 * Any users of this function should be scrutinized carefully.
2257 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
2261 unsigned long flags;
2263 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
2266 spin_lock_irqsave(&oh->_lock, flags);
2268 v = oh->_sysc_cache;
2270 retval = _set_module_autoidle(oh, autoidle, &v);
2273 _write_sysconfig(v, oh);
2275 spin_unlock_irqrestore(&oh->_lock, flags);
2281 * _shutdown - shutdown an omap_hwmod
2282 * @oh: struct omap_hwmod *
2284 * Shut down an omap_hwmod @oh. This should be called when the driver
2285 * used for the hwmod is removed or unloaded or if the driver is not
2286 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2287 * state or returns 0.
2289 static int _shutdown(struct omap_hwmod *oh)
2294 if (oh->_state != _HWMOD_STATE_IDLE &&
2295 oh->_state != _HWMOD_STATE_ENABLED) {
2296 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2301 if (_are_all_hardreset_lines_asserted(oh))
2304 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2306 if (oh->class->pre_shutdown) {
2307 prev_state = oh->_state;
2308 if (oh->_state == _HWMOD_STATE_IDLE)
2310 ret = oh->class->pre_shutdown(oh);
2312 if (prev_state == _HWMOD_STATE_IDLE)
2318 if (oh->class->sysc) {
2319 if (oh->_state == _HWMOD_STATE_IDLE)
2324 /* clocks and deps are already disabled in idle */
2325 if (oh->_state == _HWMOD_STATE_ENABLED) {
2326 _del_initiator_dep(oh, mpu_oh);
2327 /* XXX what about the other system initiators here? dma, dsp */
2328 if (oh->flags & HWMOD_BLOCK_WFI)
2330 if (soc_ops.disable_module)
2331 soc_ops.disable_module(oh);
2332 _disable_clocks(oh);
2334 clkdm_hwmod_disable(oh->clkdm, oh);
2336 /* XXX Should this code also force-disable the optional clocks? */
2338 for (i = 0; i < oh->rst_lines_cnt; i++)
2339 _assert_hardreset(oh, oh->rst_lines[i].name);
2341 /* Mux pins to safe mode or use populated off mode values */
2343 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2345 oh->_state = _HWMOD_STATE_DISABLED;
2351 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2352 * @np: struct device_node *
2353 * @oh: struct omap_hwmod *
2355 * Parse the dt blob and find out needed hwmod. Recursive function is
2356 * implemented to take care hierarchical dt blob parsing.
2357 * Return: The device node on success or NULL on failure.
2359 static struct device_node *of_dev_hwmod_lookup(struct device_node *np,
2360 struct omap_hwmod *oh)
2362 struct device_node *np0 = NULL, *np1 = NULL;
2365 for_each_child_of_node(np, np0) {
2366 if (of_find_property(np0, "ti,hwmods", NULL)) {
2367 p = of_get_property(np0, "ti,hwmods", NULL);
2368 if (!strcmp(p, oh->name))
2370 np1 = of_dev_hwmod_lookup(np0, oh);
2379 * _init_mpu_rt_base - populate the virtual address for a hwmod
2380 * @oh: struct omap_hwmod * to locate the virtual address
2382 * Cache the virtual address used by the MPU to access this IP block's
2383 * registers. This address is needed early so the OCP registers that
2384 * are part of the device's address space can be ioremapped properly.
2387 static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
2389 struct omap_hwmod_addr_space *mem;
2390 void __iomem *va_start = NULL;
2391 struct device_node *np;
2396 _save_mpu_port_index(oh);
2398 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2401 mem = _find_mpu_rt_addr_space(oh);
2403 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2406 /* Extract the IO space from device tree blob */
2407 if (!of_have_populated_dt())
2410 np = of_dev_hwmod_lookup(of_find_node_by_name(NULL, "ocp"), oh);
2412 va_start = of_iomap(np, 0);
2414 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2418 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2422 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2423 oh->name, va_start);
2425 oh->_mpu_rt_va = va_start;
2429 * _init - initialize internal data for the hwmod @oh
2430 * @oh: struct omap_hwmod *
2433 * Look up the clocks and the address space used by the MPU to access
2434 * registers belonging to the hwmod @oh. @oh must already be
2435 * registered at this point. This is the first of two phases for
2436 * hwmod initialization. Code called here does not touch any hardware
2437 * registers, it simply prepares internal data structures. Returns 0
2438 * upon success or if the hwmod isn't registered, or -EINVAL upon
2441 static int __init _init(struct omap_hwmod *oh, void *data)
2445 if (oh->_state != _HWMOD_STATE_REGISTERED)
2448 if (oh->class->sysc)
2449 _init_mpu_rt_base(oh, NULL);
2451 r = _init_clocks(oh, NULL);
2452 if (IS_ERR_VALUE(r)) {
2453 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2457 oh->_state = _HWMOD_STATE_INITIALIZED;
2463 * _setup_iclk_autoidle - configure an IP block's interface clocks
2464 * @oh: struct omap_hwmod *
2466 * Set up the module's interface clocks. XXX This function is still mostly
2467 * a stub; implementing this properly requires iclk autoidle usecounting in
2468 * the clock code. No return value.
2470 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2472 struct omap_hwmod_ocp_if *os;
2473 struct list_head *p;
2475 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2478 p = oh->slave_ports.next;
2480 while (i < oh->slaves_cnt) {
2481 os = _fetch_next_ocp_if(&p, &i);
2485 if (os->flags & OCPIF_SWSUP_IDLE) {
2486 /* XXX omap_iclk_deny_idle(c); */
2488 /* XXX omap_iclk_allow_idle(c); */
2489 clk_enable(os->_clk);
2497 * _setup_reset - reset an IP block during the setup process
2498 * @oh: struct omap_hwmod *
2500 * Reset the IP block corresponding to the hwmod @oh during the setup
2501 * process. The IP block is first enabled so it can be successfully
2502 * reset. Returns 0 upon success or a negative error code upon
2505 static int __init _setup_reset(struct omap_hwmod *oh)
2509 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2512 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2515 if (oh->rst_lines_cnt == 0) {
2518 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2519 oh->name, oh->_state);
2524 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2531 * _setup_postsetup - transition to the appropriate state after _setup
2532 * @oh: struct omap_hwmod *
2534 * Place an IP block represented by @oh into a "post-setup" state --
2535 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2536 * this function is called at the end of _setup().) The postsetup
2537 * state for an IP block can be changed by calling
2538 * omap_hwmod_enter_postsetup_state() early in the boot process,
2539 * before one of the omap_hwmod_setup*() functions are called for the
2542 * The IP block stays in this state until a PM runtime-based driver is
2543 * loaded for that IP block. A post-setup state of IDLE is
2544 * appropriate for almost all IP blocks with runtime PM-enabled
2545 * drivers, since those drivers are able to enable the IP block. A
2546 * post-setup state of ENABLED is appropriate for kernels with PM
2547 * runtime disabled. The DISABLED state is appropriate for unusual IP
2548 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2549 * included, since the WDTIMER starts running on reset and will reset
2550 * the MPU if left active.
2552 * This post-setup mechanism is deprecated. Once all of the OMAP
2553 * drivers have been converted to use PM runtime, and all of the IP
2554 * block data and interconnect data is available to the hwmod code, it
2555 * should be possible to replace this mechanism with a "lazy reset"
2556 * arrangement. In a "lazy reset" setup, each IP block is enabled
2557 * when the driver first probes, then all remaining IP blocks without
2558 * drivers are either shut down or enabled after the drivers have
2559 * loaded. However, this cannot take place until the above
2560 * preconditions have been met, since otherwise the late reset code
2561 * has no way of knowing which IP blocks are in use by drivers, and
2562 * which ones are unused.
2566 static void __init _setup_postsetup(struct omap_hwmod *oh)
2570 if (oh->rst_lines_cnt > 0)
2573 postsetup_state = oh->_postsetup_state;
2574 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2575 postsetup_state = _HWMOD_STATE_ENABLED;
2578 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2579 * it should be set by the core code as a runtime flag during startup
2581 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2582 (postsetup_state == _HWMOD_STATE_IDLE)) {
2583 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2584 postsetup_state = _HWMOD_STATE_ENABLED;
2587 if (postsetup_state == _HWMOD_STATE_IDLE)
2589 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2591 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2592 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2593 oh->name, postsetup_state);
2599 * _setup - prepare IP block hardware for use
2600 * @oh: struct omap_hwmod *
2601 * @n: (unused, pass NULL)
2603 * Configure the IP block represented by @oh. This may include
2604 * enabling the IP block, resetting it, and placing it into a
2605 * post-setup state, depending on the type of IP block and applicable
2606 * flags. IP blocks are reset to prevent any previous configuration
2607 * by the bootloader or previous operating system from interfering
2608 * with power management or other parts of the system. The reset can
2609 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2610 * two phases for hwmod initialization. Code called here generally
2611 * affects the IP block hardware, or system integration hardware
2612 * associated with the IP block. Returns 0.
2614 static int __init _setup(struct omap_hwmod *oh, void *data)
2616 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2619 _setup_iclk_autoidle(oh);
2621 if (!_setup_reset(oh))
2622 _setup_postsetup(oh);
2628 * _register - register a struct omap_hwmod
2629 * @oh: struct omap_hwmod *
2631 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2632 * already has been registered by the same name; -EINVAL if the
2633 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2634 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2635 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2638 * XXX The data should be copied into bootmem, so the original data
2639 * should be marked __initdata and freed after init. This would allow
2640 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2641 * that the copy process would be relatively complex due to the large number
2644 static int __init _register(struct omap_hwmod *oh)
2646 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2647 (oh->_state != _HWMOD_STATE_UNKNOWN))
2650 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2652 if (_lookup(oh->name))
2655 list_add_tail(&oh->node, &omap_hwmod_list);
2657 INIT_LIST_HEAD(&oh->master_ports);
2658 INIT_LIST_HEAD(&oh->slave_ports);
2659 spin_lock_init(&oh->_lock);
2661 oh->_state = _HWMOD_STATE_REGISTERED;
2664 * XXX Rather than doing a strcmp(), this should test a flag
2665 * set in the hwmod data, inserted by the autogenerator code.
2667 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2674 * _alloc_links - return allocated memory for hwmod links
2675 * @ml: pointer to a struct omap_hwmod_link * for the master link
2676 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2678 * Return pointers to two struct omap_hwmod_link records, via the
2679 * addresses pointed to by @ml and @sl. Will first attempt to return
2680 * memory allocated as part of a large initial block, but if that has
2681 * been exhausted, will allocate memory itself. Since ideally this
2682 * second allocation path will never occur, the number of these
2683 * 'supplemental' allocations will be logged when debugging is
2684 * enabled. Returns 0.
2686 static int __init _alloc_links(struct omap_hwmod_link **ml,
2687 struct omap_hwmod_link **sl)
2691 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2692 *ml = &linkspace[free_ls++];
2693 *sl = &linkspace[free_ls++];
2697 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2700 *ml = alloc_bootmem(sz);
2704 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2707 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2708 ls_supp * LINKS_PER_OCP_IF);
2714 * _add_link - add an interconnect between two IP blocks
2715 * @oi: pointer to a struct omap_hwmod_ocp_if record
2717 * Add struct omap_hwmod_link records connecting the master IP block
2718 * specified in @oi->master to @oi, and connecting the slave IP block
2719 * specified in @oi->slave to @oi. This code is assumed to run before
2720 * preemption or SMP has been enabled, thus avoiding the need for
2721 * locking in this code. Changes to this assumption will require
2722 * additional locking. Returns 0.
2724 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2726 struct omap_hwmod_link *ml, *sl;
2728 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2731 _alloc_links(&ml, &sl);
2734 INIT_LIST_HEAD(&ml->node);
2735 list_add(&ml->node, &oi->master->master_ports);
2736 oi->master->masters_cnt++;
2739 INIT_LIST_HEAD(&sl->node);
2740 list_add(&sl->node, &oi->slave->slave_ports);
2741 oi->slave->slaves_cnt++;
2747 * _register_link - register a struct omap_hwmod_ocp_if
2748 * @oi: struct omap_hwmod_ocp_if *
2750 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2751 * has already been registered; -EINVAL if @oi is NULL or if the
2752 * record pointed to by @oi is missing required fields; or 0 upon
2755 * XXX The data should be copied into bootmem, so the original data
2756 * should be marked __initdata and freed after init. This would allow
2757 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2759 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2761 if (!oi || !oi->master || !oi->slave || !oi->user)
2764 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2767 pr_debug("omap_hwmod: registering link from %s to %s\n",
2768 oi->master->name, oi->slave->name);
2771 * Register the connected hwmods, if they haven't been
2772 * registered already
2774 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2775 _register(oi->master);
2777 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2778 _register(oi->slave);
2782 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2788 * _alloc_linkspace - allocate large block of hwmod links
2789 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2791 * Allocate a large block of struct omap_hwmod_link records. This
2792 * improves boot time significantly by avoiding the need to allocate
2793 * individual records one by one. If the number of records to
2794 * allocate in the block hasn't been manually specified, this function
2795 * will count the number of struct omap_hwmod_ocp_if records in @ois
2796 * and use that to determine the allocation size. For SoC families
2797 * that require multiple list registrations, such as OMAP3xxx, this
2798 * estimation process isn't optimal, so manual estimation is advised
2799 * in those cases. Returns -EEXIST if the allocation has already occurred
2800 * or 0 upon success.
2802 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2808 WARN(1, "linkspace already allocated\n");
2814 max_ls += LINKS_PER_OCP_IF;
2816 sz = sizeof(struct omap_hwmod_link) * max_ls;
2818 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2819 __func__, sz, max_ls);
2821 linkspace = alloc_bootmem(sz);
2823 memset(linkspace, 0, sz);
2828 /* Static functions intended only for use in soc_ops field function pointers */
2831 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2832 * @oh: struct omap_hwmod *
2834 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2835 * does not have an IDLEST bit or if the module successfully leaves
2836 * slave idle; otherwise, pass along the return value of the
2837 * appropriate *_cm*_wait_module_ready() function.
2839 static int _omap2xxx_wait_target_ready(struct omap_hwmod *oh)
2844 if (oh->flags & HWMOD_NO_IDLEST)
2847 if (!_find_mpu_rt_port(oh))
2850 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2852 return omap2xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2853 oh->prcm.omap2.idlest_reg_id,
2854 oh->prcm.omap2.idlest_idle_bit);
2858 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2859 * @oh: struct omap_hwmod *
2861 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2862 * does not have an IDLEST bit or if the module successfully leaves
2863 * slave idle; otherwise, pass along the return value of the
2864 * appropriate *_cm*_wait_module_ready() function.
2866 static int _omap3xxx_wait_target_ready(struct omap_hwmod *oh)
2871 if (oh->flags & HWMOD_NO_IDLEST)
2874 if (!_find_mpu_rt_port(oh))
2877 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2879 return omap3xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2880 oh->prcm.omap2.idlest_reg_id,
2881 oh->prcm.omap2.idlest_idle_bit);
2885 * _omap4_wait_target_ready - wait for a module to leave slave idle
2886 * @oh: struct omap_hwmod *
2888 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2889 * does not have an IDLEST bit or if the module successfully leaves
2890 * slave idle; otherwise, pass along the return value of the
2891 * appropriate *_cm*_wait_module_ready() function.
2893 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2898 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2901 if (!_find_mpu_rt_port(oh))
2904 /* XXX check module SIDLEMODE, hardreset status */
2906 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
2908 oh->clkdm->clkdm_offs,
2909 oh->prcm.omap4.clkctrl_offs);
2913 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2914 * @oh: struct omap_hwmod *
2916 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2917 * does not have an IDLEST bit or if the module successfully leaves
2918 * slave idle; otherwise, pass along the return value of the
2919 * appropriate *_cm*_wait_module_ready() function.
2921 static int _am33xx_wait_target_ready(struct omap_hwmod *oh)
2923 if (!oh || !oh->clkdm)
2926 if (oh->flags & HWMOD_NO_IDLEST)
2929 if (!_find_mpu_rt_port(oh))
2932 /* XXX check module SIDLEMODE, hardreset status */
2934 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst,
2935 oh->clkdm->clkdm_offs,
2936 oh->prcm.omap4.clkctrl_offs);
2940 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2941 * @oh: struct omap_hwmod * to assert hardreset
2942 * @ohri: hardreset line data
2944 * Call omap2_prm_assert_hardreset() with parameters extracted from
2945 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2946 * use as an soc_ops function pointer. Passes along the return value
2947 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2948 * for removal when the PRM code is moved into drivers/.
2950 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2951 struct omap_hwmod_rst_info *ohri)
2953 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
2958 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2959 * @oh: struct omap_hwmod * to deassert hardreset
2960 * @ohri: hardreset line data
2962 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2963 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2964 * use as an soc_ops function pointer. Passes along the return value
2965 * from omap2_prm_deassert_hardreset(). XXX This function is
2966 * scheduled for removal when the PRM code is moved into drivers/.
2968 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2969 struct omap_hwmod_rst_info *ohri)
2971 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
2977 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2978 * @oh: struct omap_hwmod * to test hardreset
2979 * @ohri: hardreset line data
2981 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2982 * from the hwmod @oh and the hardreset line data @ohri. Only
2983 * intended for use as an soc_ops function pointer. Passes along the
2984 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2985 * function is scheduled for removal when the PRM code is moved into
2988 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2989 struct omap_hwmod_rst_info *ohri)
2991 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
2996 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2997 * @oh: struct omap_hwmod * to assert hardreset
2998 * @ohri: hardreset line data
3000 * Call omap4_prminst_assert_hardreset() with parameters extracted
3001 * from the hwmod @oh and the hardreset line data @ohri. Only
3002 * intended for use as an soc_ops function pointer. Passes along the
3003 * return value from omap4_prminst_assert_hardreset(). XXX This
3004 * function is scheduled for removal when the PRM code is moved into
3007 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
3008 struct omap_hwmod_rst_info *ohri)
3013 return omap4_prminst_assert_hardreset(ohri->rst_shift,
3014 oh->clkdm->pwrdm.ptr->prcm_partition,
3015 oh->clkdm->pwrdm.ptr->prcm_offs,
3016 oh->prcm.omap4.rstctrl_offs);
3020 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3021 * @oh: struct omap_hwmod * to deassert hardreset
3022 * @ohri: hardreset line data
3024 * Call omap4_prminst_deassert_hardreset() with parameters extracted
3025 * from the hwmod @oh and the hardreset line data @ohri. Only
3026 * intended for use as an soc_ops function pointer. Passes along the
3027 * return value from omap4_prminst_deassert_hardreset(). XXX This
3028 * function is scheduled for removal when the PRM code is moved into
3031 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
3032 struct omap_hwmod_rst_info *ohri)
3038 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3039 oh->name, ohri->name);
3040 return omap4_prminst_deassert_hardreset(ohri->rst_shift,
3041 oh->clkdm->pwrdm.ptr->prcm_partition,
3042 oh->clkdm->pwrdm.ptr->prcm_offs,
3043 oh->prcm.omap4.rstctrl_offs);
3047 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3048 * @oh: struct omap_hwmod * to test hardreset
3049 * @ohri: hardreset line data
3051 * Call omap4_prminst_is_hardreset_asserted() with parameters
3052 * extracted from the hwmod @oh and the hardreset line data @ohri.
3053 * Only intended for use as an soc_ops function pointer. Passes along
3054 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3055 * This function is scheduled for removal when the PRM code is moved
3058 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3059 struct omap_hwmod_rst_info *ohri)
3064 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift,
3065 oh->clkdm->pwrdm.ptr->prcm_partition,
3066 oh->clkdm->pwrdm.ptr->prcm_offs,
3067 oh->prcm.omap4.rstctrl_offs);
3071 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3072 * @oh: struct omap_hwmod * to assert hardreset
3073 * @ohri: hardreset line data
3075 * Call am33xx_prminst_assert_hardreset() with parameters extracted
3076 * from the hwmod @oh and the hardreset line data @ohri. Only
3077 * intended for use as an soc_ops function pointer. Passes along the
3078 * return value from am33xx_prminst_assert_hardreset(). XXX This
3079 * function is scheduled for removal when the PRM code is moved into
3082 static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
3083 struct omap_hwmod_rst_info *ohri)
3086 return am33xx_prm_assert_hardreset(ohri->rst_shift,
3087 oh->clkdm->pwrdm.ptr->prcm_offs,
3088 oh->prcm.omap4.rstctrl_offs);
3092 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3093 * @oh: struct omap_hwmod * to deassert hardreset
3094 * @ohri: hardreset line data
3096 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3097 * from the hwmod @oh and the hardreset line data @ohri. Only
3098 * intended for use as an soc_ops function pointer. Passes along the
3099 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3100 * function is scheduled for removal when the PRM code is moved into
3103 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3104 struct omap_hwmod_rst_info *ohri)
3106 return am33xx_prm_deassert_hardreset(ohri->rst_shift,
3108 oh->clkdm->pwrdm.ptr->prcm_offs,
3109 oh->prcm.omap4.rstctrl_offs,
3110 oh->prcm.omap4.rstst_offs);
3114 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
3115 * @oh: struct omap_hwmod * to test hardreset
3116 * @ohri: hardreset line data
3118 * Call am33xx_prminst_is_hardreset_asserted() with parameters
3119 * extracted from the hwmod @oh and the hardreset line data @ohri.
3120 * Only intended for use as an soc_ops function pointer. Passes along
3121 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
3122 * This function is scheduled for removal when the PRM code is moved
3125 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh,
3126 struct omap_hwmod_rst_info *ohri)
3128 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift,
3129 oh->clkdm->pwrdm.ptr->prcm_offs,
3130 oh->prcm.omap4.rstctrl_offs);
3133 /* Public functions */
3135 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3137 if (oh->flags & HWMOD_16BIT_REG)
3138 return __raw_readw(oh->_mpu_rt_va + reg_offs);
3140 return __raw_readl(oh->_mpu_rt_va + reg_offs);
3143 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3145 if (oh->flags & HWMOD_16BIT_REG)
3146 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
3148 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
3152 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3153 * @oh: struct omap_hwmod *
3155 * This is a public function exposed to drivers. Some drivers may need to do
3156 * some settings before and after resetting the device. Those drivers after
3157 * doing the necessary settings could use this function to start a reset by
3158 * setting the SYSCONFIG.SOFTRESET bit.
3160 int omap_hwmod_softreset(struct omap_hwmod *oh)
3165 if (!oh || !(oh->_sysc_cache))
3168 v = oh->_sysc_cache;
3169 ret = _set_softreset(oh, &v);
3172 _write_sysconfig(v, oh);
3179 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
3180 * @oh: struct omap_hwmod *
3181 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
3183 * Sets the IP block's OCP slave idlemode in hardware, and updates our
3184 * local copy. Intended to be used by drivers that have some erratum
3185 * that requires direct manipulation of the SIDLEMODE bits. Returns
3186 * -EINVAL if @oh is null, or passes along the return value from
3187 * _set_slave_idlemode().
3189 * XXX Does this function have any current users? If not, we should
3190 * remove it; it is better to let the rest of the hwmod code handle this.
3191 * Any users of this function should be scrutinized carefully.
3193 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
3201 v = oh->_sysc_cache;
3203 retval = _set_slave_idlemode(oh, idlemode, &v);
3205 _write_sysconfig(v, oh);
3211 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3212 * @name: name of the omap_hwmod to look up
3214 * Given a @name of an omap_hwmod, return a pointer to the registered
3215 * struct omap_hwmod *, or NULL upon error.
3217 struct omap_hwmod *omap_hwmod_lookup(const char *name)
3219 struct omap_hwmod *oh;
3230 * omap_hwmod_for_each - call function for each registered omap_hwmod
3231 * @fn: pointer to a callback function
3232 * @data: void * data to pass to callback function
3234 * Call @fn for each registered omap_hwmod, passing @data to each
3235 * function. @fn must return 0 for success or any other value for
3236 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3237 * will stop and the non-zero return value will be passed to the
3238 * caller of omap_hwmod_for_each(). @fn is called with
3239 * omap_hwmod_for_each() held.
3241 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3244 struct omap_hwmod *temp_oh;
3250 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3251 ret = (*fn)(temp_oh, data);
3260 * omap_hwmod_register_links - register an array of hwmod links
3261 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3263 * Intended to be called early in boot before the clock framework is
3264 * initialized. If @ois is not null, will register all omap_hwmods
3265 * listed in @ois that are valid for this chip. Returns -EINVAL if
3266 * omap_hwmod_init() hasn't been called before calling this function,
3267 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3270 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3281 if (_alloc_linkspace(ois)) {
3282 pr_err("omap_hwmod: could not allocate link space\n");
3289 r = _register_link(ois[i]);
3290 WARN(r && r != -EEXIST,
3291 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3292 ois[i]->master->name, ois[i]->slave->name, r);
3299 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3300 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3302 * If the hwmod data corresponding to the MPU subsystem IP block
3303 * hasn't been initialized and set up yet, do so now. This must be
3304 * done first since sleep dependencies may be added from other hwmods
3305 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3308 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3310 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3311 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3312 __func__, MPU_INITIATOR_NAME);
3313 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3314 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3318 * omap_hwmod_setup_one - set up a single hwmod
3319 * @oh_name: const char * name of the already-registered hwmod to set up
3321 * Initialize and set up a single hwmod. Intended to be used for a
3322 * small number of early devices, such as the timer IP blocks used for
3323 * the scheduler clock. Must be called after omap2_clk_init().
3324 * Resolves the struct clk names to struct clk pointers for each
3325 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3326 * -EINVAL upon error or 0 upon success.
3328 int __init omap_hwmod_setup_one(const char *oh_name)
3330 struct omap_hwmod *oh;
3332 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3334 oh = _lookup(oh_name);
3336 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3340 _ensure_mpu_hwmod_is_setup(oh);
3349 * omap_hwmod_setup_all - set up all registered IP blocks
3351 * Initialize and set up all IP blocks registered with the hwmod code.
3352 * Must be called after omap2_clk_init(). Resolves the struct clk
3353 * names to struct clk pointers for each registered omap_hwmod. Also
3354 * calls _setup() on each hwmod. Returns 0 upon success.
3356 static int __init omap_hwmod_setup_all(void)
3358 _ensure_mpu_hwmod_is_setup(NULL);
3360 omap_hwmod_for_each(_init, NULL);
3361 omap_hwmod_for_each(_setup, NULL);
3365 omap_core_initcall(omap_hwmod_setup_all);
3368 * omap_hwmod_enable - enable an omap_hwmod
3369 * @oh: struct omap_hwmod *
3371 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3372 * Returns -EINVAL on error or passes along the return value from _enable().
3374 int omap_hwmod_enable(struct omap_hwmod *oh)
3377 unsigned long flags;
3382 spin_lock_irqsave(&oh->_lock, flags);
3384 spin_unlock_irqrestore(&oh->_lock, flags);
3390 * omap_hwmod_idle - idle an omap_hwmod
3391 * @oh: struct omap_hwmod *
3393 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3394 * Returns -EINVAL on error or passes along the return value from _idle().
3396 int omap_hwmod_idle(struct omap_hwmod *oh)
3398 unsigned long flags;
3403 spin_lock_irqsave(&oh->_lock, flags);
3405 spin_unlock_irqrestore(&oh->_lock, flags);
3411 * omap_hwmod_shutdown - shutdown an omap_hwmod
3412 * @oh: struct omap_hwmod *
3414 * Shutdown an omap_hwmod @oh. Intended to be called by
3415 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3416 * the return value from _shutdown().
3418 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3420 unsigned long flags;
3425 spin_lock_irqsave(&oh->_lock, flags);
3427 spin_unlock_irqrestore(&oh->_lock, flags);
3433 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3434 * @oh: struct omap_hwmod *oh
3436 * Intended to be called by the omap_device code.
3438 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
3440 unsigned long flags;
3442 spin_lock_irqsave(&oh->_lock, flags);
3444 spin_unlock_irqrestore(&oh->_lock, flags);
3450 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3451 * @oh: struct omap_hwmod *oh
3453 * Intended to be called by the omap_device code.
3455 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
3457 unsigned long flags;
3459 spin_lock_irqsave(&oh->_lock, flags);
3460 _disable_clocks(oh);
3461 spin_unlock_irqrestore(&oh->_lock, flags);
3467 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3468 * @oh: struct omap_hwmod *oh
3470 * Intended to be called by drivers and core code when all posted
3471 * writes to a device must complete before continuing further
3472 * execution (for example, after clearing some device IRQSTATUS
3475 * XXX what about targets with multiple OCP threads?
3477 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
3481 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
3482 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3488 * Forces posted writes to complete on the OCP thread handling
3491 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
3495 * omap_hwmod_reset - reset the hwmod
3496 * @oh: struct omap_hwmod *
3498 * Under some conditions, a driver may wish to reset the entire device.
3499 * Called from omap_device code. Returns -EINVAL on error or passes along
3500 * the return value from _reset().
3502 int omap_hwmod_reset(struct omap_hwmod *oh)
3505 unsigned long flags;
3510 spin_lock_irqsave(&oh->_lock, flags);
3512 spin_unlock_irqrestore(&oh->_lock, flags);
3518 * IP block data retrieval functions
3522 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3523 * @oh: struct omap_hwmod *
3524 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3526 * Count the number of struct resource array elements necessary to
3527 * contain omap_hwmod @oh resources. Intended to be called by code
3528 * that registers omap_devices. Intended to be used to determine the
3529 * size of a dynamically-allocated struct resource array, before
3530 * calling omap_hwmod_fill_resources(). Returns the number of struct
3531 * resource array elements needed.
3533 * XXX This code is not optimized. It could attempt to merge adjacent
3537 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3541 if (flags & IORESOURCE_IRQ)
3542 ret += _count_mpu_irqs(oh);
3544 if (flags & IORESOURCE_DMA)
3545 ret += _count_sdma_reqs(oh);
3547 if (flags & IORESOURCE_MEM) {
3549 struct omap_hwmod_ocp_if *os;
3550 struct list_head *p = oh->slave_ports.next;
3552 while (i < oh->slaves_cnt) {
3553 os = _fetch_next_ocp_if(&p, &i);
3554 ret += _count_ocp_if_addr_spaces(os);
3562 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3563 * @oh: struct omap_hwmod *
3564 * @res: pointer to the first element of an array of struct resource to fill
3566 * Fill the struct resource array @res with resource data from the
3567 * omap_hwmod @oh. Intended to be called by code that registers
3568 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3569 * number of array elements filled.
3571 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3573 struct omap_hwmod_ocp_if *os;
3574 struct list_head *p;
3575 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3578 /* For each IRQ, DMA, memory area, fill in array.*/
3580 mpu_irqs_cnt = _count_mpu_irqs(oh);
3581 for (i = 0; i < mpu_irqs_cnt; i++) {
3582 (res + r)->name = (oh->mpu_irqs + i)->name;
3583 (res + r)->start = (oh->mpu_irqs + i)->irq;
3584 (res + r)->end = (oh->mpu_irqs + i)->irq;
3585 (res + r)->flags = IORESOURCE_IRQ;
3589 sdma_reqs_cnt = _count_sdma_reqs(oh);
3590 for (i = 0; i < sdma_reqs_cnt; i++) {
3591 (res + r)->name = (oh->sdma_reqs + i)->name;
3592 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3593 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3594 (res + r)->flags = IORESOURCE_DMA;
3598 p = oh->slave_ports.next;
3601 while (i < oh->slaves_cnt) {
3602 os = _fetch_next_ocp_if(&p, &i);
3603 addr_cnt = _count_ocp_if_addr_spaces(os);
3605 for (j = 0; j < addr_cnt; j++) {
3606 (res + r)->name = (os->addr + j)->name;
3607 (res + r)->start = (os->addr + j)->pa_start;
3608 (res + r)->end = (os->addr + j)->pa_end;
3609 (res + r)->flags = IORESOURCE_MEM;
3618 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3619 * @oh: struct omap_hwmod *
3620 * @res: pointer to the array of struct resource to fill
3622 * Fill the struct resource array @res with dma resource data from the
3623 * omap_hwmod @oh. Intended to be called by code that registers
3624 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3625 * number of array elements filled.
3627 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3629 int i, sdma_reqs_cnt;
3632 sdma_reqs_cnt = _count_sdma_reqs(oh);
3633 for (i = 0; i < sdma_reqs_cnt; i++) {
3634 (res + r)->name = (oh->sdma_reqs + i)->name;
3635 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3636 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3637 (res + r)->flags = IORESOURCE_DMA;
3645 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3646 * @oh: struct omap_hwmod * to operate on
3647 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3648 * @name: pointer to the name of the data to fetch (optional)
3649 * @rsrc: pointer to a struct resource, allocated by the caller
3651 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3652 * data for the IP block pointed to by @oh. The data will be filled
3653 * into a struct resource record pointed to by @rsrc. The struct
3654 * resource must be allocated by the caller. When @name is non-null,
3655 * the data associated with the matching entry in the IRQ/SDMA/address
3656 * space hwmod data arrays will be returned. If @name is null, the
3657 * first array entry will be returned. Data order is not meaningful
3658 * in hwmod data, so callers are strongly encouraged to use a non-null
3659 * @name whenever possible to avoid unpredictable effects if hwmod
3660 * data is later added that causes data ordering to change. This
3661 * function is only intended for use by OMAP core code. Device
3662 * drivers should not call this function - the appropriate bus-related
3663 * data accessor functions should be used instead. Returns 0 upon
3664 * success or a negative error code upon error.
3666 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3667 const char *name, struct resource *rsrc)
3670 unsigned int irq, dma;
3671 u32 pa_start, pa_end;
3676 if (type == IORESOURCE_IRQ) {
3677 r = _get_mpu_irq_by_name(oh, name, &irq);
3683 } else if (type == IORESOURCE_DMA) {
3684 r = _get_sdma_req_by_name(oh, name, &dma);
3690 } else if (type == IORESOURCE_MEM) {
3691 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3695 rsrc->start = pa_start;
3708 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3709 * @oh: struct omap_hwmod *
3711 * Return the powerdomain pointer associated with the OMAP module
3712 * @oh's main clock. If @oh does not have a main clk, return the
3713 * powerdomain associated with the interface clock associated with the
3714 * module's MPU port. (XXX Perhaps this should use the SDMA port
3715 * instead?) Returns NULL on error, or a struct powerdomain * on
3718 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3721 struct omap_hwmod_ocp_if *oi;
3722 struct clockdomain *clkdm;
3723 struct clk_hw_omap *clk;
3729 return oh->clkdm->pwrdm.ptr;
3734 oi = _find_mpu_rt_port(oh);
3740 clk = to_clk_hw_omap(__clk_get_hw(c));
3745 return clkdm->pwrdm.ptr;
3749 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3750 * @oh: struct omap_hwmod *
3752 * Returns the virtual address corresponding to the beginning of the
3753 * module's register target, in the address range that is intended to
3754 * be used by the MPU. Returns the virtual address upon success or NULL
3757 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3762 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3765 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3768 return oh->_mpu_rt_va;
3772 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3773 * @oh: struct omap_hwmod *
3774 * @init_oh: struct omap_hwmod * (initiator)
3776 * Add a sleep dependency between the initiator @init_oh and @oh.
3777 * Intended to be called by DSP/Bridge code via platform_data for the
3778 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3779 * code needs to add/del initiator dependencies dynamically
3780 * before/after accessing a device. Returns the return value from
3781 * _add_initiator_dep().
3783 * XXX Keep a usecount in the clockdomain code
3785 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
3786 struct omap_hwmod *init_oh)
3788 return _add_initiator_dep(oh, init_oh);
3792 * XXX what about functions for drivers to save/restore ocp_sysconfig
3793 * for context save/restore operations?
3797 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3798 * @oh: struct omap_hwmod *
3799 * @init_oh: struct omap_hwmod * (initiator)
3801 * Remove a sleep dependency between the initiator @init_oh and @oh.
3802 * Intended to be called by DSP/Bridge code via platform_data for the
3803 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3804 * code needs to add/del initiator dependencies dynamically
3805 * before/after accessing a device. Returns the return value from
3806 * _del_initiator_dep().
3808 * XXX Keep a usecount in the clockdomain code
3810 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
3811 struct omap_hwmod *init_oh)
3813 return _del_initiator_dep(oh, init_oh);
3817 * omap_hwmod_enable_wakeup - allow device to wake up the system
3818 * @oh: struct omap_hwmod *
3820 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3821 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3822 * this IP block if it has dynamic mux entries. Eventually this
3823 * should set PRCM wakeup registers to cause the PRCM to receive
3824 * wakeup events from the module. Does not set any wakeup routing
3825 * registers beyond this point - if the module is to wake up any other
3826 * module or subsystem, that must be set separately. Called by
3827 * omap_device code. Returns -EINVAL on error or 0 upon success.
3829 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3831 unsigned long flags;
3834 spin_lock_irqsave(&oh->_lock, flags);
3836 if (oh->class->sysc &&
3837 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3838 v = oh->_sysc_cache;
3839 _enable_wakeup(oh, &v);
3840 _write_sysconfig(v, oh);
3843 _set_idle_ioring_wakeup(oh, true);
3844 spin_unlock_irqrestore(&oh->_lock, flags);
3850 * omap_hwmod_disable_wakeup - prevent device from waking the system
3851 * @oh: struct omap_hwmod *
3853 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3854 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3855 * events for this IP block if it has dynamic mux entries. Eventually
3856 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3857 * wakeup events from the module. Does not set any wakeup routing
3858 * registers beyond this point - if the module is to wake up any other
3859 * module or subsystem, that must be set separately. Called by
3860 * omap_device code. Returns -EINVAL on error or 0 upon success.
3862 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3864 unsigned long flags;
3867 spin_lock_irqsave(&oh->_lock, flags);
3869 if (oh->class->sysc &&
3870 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3871 v = oh->_sysc_cache;
3872 _disable_wakeup(oh, &v);
3873 _write_sysconfig(v, oh);
3876 _set_idle_ioring_wakeup(oh, false);
3877 spin_unlock_irqrestore(&oh->_lock, flags);
3883 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3884 * contained in the hwmod module.
3885 * @oh: struct omap_hwmod *
3886 * @name: name of the reset line to lookup and assert
3888 * Some IP like dsp, ipu or iva contain processor that require
3889 * an HW reset line to be assert / deassert in order to enable fully
3890 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3891 * yet supported on this OMAP; otherwise, passes along the return value
3892 * from _assert_hardreset().
3894 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3897 unsigned long flags;
3902 spin_lock_irqsave(&oh->_lock, flags);
3903 ret = _assert_hardreset(oh, name);
3904 spin_unlock_irqrestore(&oh->_lock, flags);
3910 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3911 * contained in the hwmod module.
3912 * @oh: struct omap_hwmod *
3913 * @name: name of the reset line to look up and deassert
3915 * Some IP like dsp, ipu or iva contain processor that require
3916 * an HW reset line to be assert / deassert in order to enable fully
3917 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3918 * yet supported on this OMAP; otherwise, passes along the return value
3919 * from _deassert_hardreset().
3921 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3924 unsigned long flags;
3929 spin_lock_irqsave(&oh->_lock, flags);
3930 ret = _deassert_hardreset(oh, name);
3931 spin_unlock_irqrestore(&oh->_lock, flags);
3937 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3938 * contained in the hwmod module
3939 * @oh: struct omap_hwmod *
3940 * @name: name of the reset line to look up and read
3942 * Return the current state of the hwmod @oh's reset line named @name:
3943 * returns -EINVAL upon parameter error or if this operation
3944 * is unsupported on the current OMAP; otherwise, passes along the return
3945 * value from _read_hardreset().
3947 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
3950 unsigned long flags;
3955 spin_lock_irqsave(&oh->_lock, flags);
3956 ret = _read_hardreset(oh, name);
3957 spin_unlock_irqrestore(&oh->_lock, flags);
3964 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3965 * @classname: struct omap_hwmod_class name to search for
3966 * @fn: callback function pointer to call for each hwmod in class @classname
3967 * @user: arbitrary context data to pass to the callback function
3969 * For each omap_hwmod of class @classname, call @fn.
3970 * If the callback function returns something other than
3971 * zero, the iterator is terminated, and the callback function's return
3972 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3973 * if @classname or @fn are NULL, or passes back the error code from @fn.
3975 int omap_hwmod_for_each_by_class(const char *classname,
3976 int (*fn)(struct omap_hwmod *oh,
3980 struct omap_hwmod *temp_oh;
3983 if (!classname || !fn)
3986 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3987 __func__, classname);
3989 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3990 if (!strcmp(temp_oh->class->name, classname)) {
3991 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3992 __func__, temp_oh->name);
3993 ret = (*fn)(temp_oh, user);
4000 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
4007 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
4008 * @oh: struct omap_hwmod *
4009 * @state: state that _setup() should leave the hwmod in
4011 * Sets the hwmod state that @oh will enter at the end of _setup()
4012 * (called by omap_hwmod_setup_*()). See also the documentation
4013 * for _setup_postsetup(), above. Returns 0 upon success or
4014 * -EINVAL if there is a problem with the arguments or if the hwmod is
4015 * in the wrong state.
4017 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
4020 unsigned long flags;
4025 if (state != _HWMOD_STATE_DISABLED &&
4026 state != _HWMOD_STATE_ENABLED &&
4027 state != _HWMOD_STATE_IDLE)
4030 spin_lock_irqsave(&oh->_lock, flags);
4032 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4037 oh->_postsetup_state = state;
4041 spin_unlock_irqrestore(&oh->_lock, flags);
4047 * omap_hwmod_get_context_loss_count - get lost context count
4048 * @oh: struct omap_hwmod *
4050 * Returns the context loss count of associated @oh
4051 * upon success, or zero if no context loss data is available.
4053 * On OMAP4, this queries the per-hwmod context loss register,
4054 * assuming one exists. If not, or on OMAP2/3, this queries the
4055 * enclosing powerdomain context loss count.
4057 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
4059 struct powerdomain *pwrdm;
4062 if (soc_ops.get_context_lost)
4063 return soc_ops.get_context_lost(oh);
4065 pwrdm = omap_hwmod_get_pwrdm(oh);
4067 ret = pwrdm_get_context_loss_count(pwrdm);
4073 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
4074 * @oh: struct omap_hwmod *
4076 * Prevent the hwmod @oh from being reset during the setup process.
4077 * Intended for use by board-*.c files on boards with devices that
4078 * cannot tolerate being reset. Must be called before the hwmod has
4079 * been set up. Returns 0 upon success or negative error code upon
4082 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
4087 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4088 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
4093 oh->flags |= HWMOD_INIT_NO_RESET;
4099 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
4100 * @oh: struct omap_hwmod * containing hwmod mux entries
4101 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
4102 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
4104 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
4105 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
4106 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
4107 * this function is not called for a given pad_idx, then the ISR
4108 * associated with @oh's first MPU IRQ will be triggered when an I/O
4109 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
4110 * the _dynamic or wakeup_ entry: if there are other entries not
4111 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
4112 * entries are NOT COUNTED in the dynamic pad index. This function
4113 * must be called separately for each pad that requires its interrupt
4114 * to be re-routed this way. Returns -EINVAL if there is an argument
4115 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
4116 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
4118 * XXX This function interface is fragile. Rather than using array
4119 * indexes, which are subject to unpredictable change, it should be
4120 * using hwmod IRQ names, and some other stable key for the hwmod mux
4123 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
4129 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
4130 pad_idx >= oh->mux->nr_pads_dynamic)
4133 /* Check the number of available mpu_irqs */
4134 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
4137 if (irq_idx >= nr_irqs)
4140 if (!oh->mux->irqs) {
4141 /* XXX What frees this? */
4142 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
4147 oh->mux->irqs[pad_idx] = irq_idx;
4153 * omap_hwmod_init - initialize the hwmod code
4155 * Sets up some function pointers needed by the hwmod code to operate on the
4156 * currently-booted SoC. Intended to be called once during kernel init
4157 * before any hwmods are registered. No return value.
4159 void __init omap_hwmod_init(void)
4161 if (cpu_is_omap24xx()) {
4162 soc_ops.wait_target_ready = _omap2xxx_wait_target_ready;
4163 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4164 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4165 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4166 } else if (cpu_is_omap34xx()) {
4167 soc_ops.wait_target_ready = _omap3xxx_wait_target_ready;
4168 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4169 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4170 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4171 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
4172 soc_ops.enable_module = _omap4_enable_module;
4173 soc_ops.disable_module = _omap4_disable_module;
4174 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4175 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4176 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4177 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4178 soc_ops.init_clkdm = _init_clkdm;
4179 soc_ops.update_context_lost = _omap4_update_context_lost;
4180 soc_ops.get_context_lost = _omap4_get_context_lost;
4181 } else if (soc_is_am33xx()) {
4182 soc_ops.enable_module = _am33xx_enable_module;
4183 soc_ops.disable_module = _am33xx_disable_module;
4184 soc_ops.wait_target_ready = _am33xx_wait_target_ready;
4185 soc_ops.assert_hardreset = _am33xx_assert_hardreset;
4186 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4187 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted;
4188 soc_ops.init_clkdm = _init_clkdm;
4190 WARN(1, "omap_hwmod: unknown SoC type\n");
4197 * omap_hwmod_get_main_clk - get pointer to main clock name
4198 * @oh: struct omap_hwmod *
4200 * Returns the main clock name assocated with @oh upon success,
4201 * or NULL if @oh is NULL.
4203 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4208 return oh->main_clk;