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>
142 #include <asm/system_misc.h>
145 #include "omap_hwmod.h"
149 #include "clockdomain.h"
150 #include "powerdomain.h"
153 #include "cminst44xx.h"
159 #include "prminst44xx.h"
163 /* Name of the OMAP hwmod for the MPU */
164 #define MPU_INITIATOR_NAME "mpu"
167 * Number of struct omap_hwmod_link records per struct
168 * omap_hwmod_ocp_if record (master->slave and slave->master)
170 #define LINKS_PER_OCP_IF 2
173 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
174 * @enable_module: function to enable a module (via MODULEMODE)
175 * @disable_module: function to disable a module (via MODULEMODE)
177 * XXX Eventually this functionality will be hidden inside the PRM/CM
178 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
179 * conditionals in this code.
181 struct omap_hwmod_soc_ops {
182 void (*enable_module)(struct omap_hwmod *oh);
183 int (*disable_module)(struct omap_hwmod *oh);
184 int (*wait_target_ready)(struct omap_hwmod *oh);
185 int (*assert_hardreset)(struct omap_hwmod *oh,
186 struct omap_hwmod_rst_info *ohri);
187 int (*deassert_hardreset)(struct omap_hwmod *oh,
188 struct omap_hwmod_rst_info *ohri);
189 int (*is_hardreset_asserted)(struct omap_hwmod *oh,
190 struct omap_hwmod_rst_info *ohri);
191 int (*init_clkdm)(struct omap_hwmod *oh);
192 void (*update_context_lost)(struct omap_hwmod *oh);
193 int (*get_context_lost)(struct omap_hwmod *oh);
196 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
197 static struct omap_hwmod_soc_ops soc_ops;
199 /* omap_hwmod_list contains all registered struct omap_hwmods */
200 static LIST_HEAD(omap_hwmod_list);
202 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
203 static struct omap_hwmod *mpu_oh;
205 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
206 static DEFINE_SPINLOCK(io_chain_lock);
209 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
210 * allocated from - used to reduce the number of small memory
211 * allocations, which has a significant impact on performance
213 static struct omap_hwmod_link *linkspace;
216 * free_ls, max_ls: array indexes into linkspace; representing the
217 * next free struct omap_hwmod_link index, and the maximum number of
218 * struct omap_hwmod_link records allocated (respectively)
220 static unsigned short free_ls, max_ls, ls_supp;
222 /* inited: set to true once the hwmod code is initialized */
225 /* Private functions */
228 * _fetch_next_ocp_if - return the next OCP interface in a list
229 * @p: ptr to a ptr to the list_head inside the ocp_if to return
230 * @i: pointer to the index of the element pointed to by @p in the list
232 * Return a pointer to the struct omap_hwmod_ocp_if record
233 * containing the struct list_head pointed to by @p, and increment
234 * @p such that a future call to this routine will return the next
237 static struct omap_hwmod_ocp_if *_fetch_next_ocp_if(struct list_head **p,
240 struct omap_hwmod_ocp_if *oi;
242 oi = list_entry(*p, struct omap_hwmod_link, node)->ocp_if;
251 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
252 * @oh: struct omap_hwmod *
254 * Load the current value of the hwmod OCP_SYSCONFIG register into the
255 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
256 * OCP_SYSCONFIG register or 0 upon success.
258 static int _update_sysc_cache(struct omap_hwmod *oh)
260 if (!oh->class->sysc) {
261 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
265 /* XXX ensure module interface clock is up */
267 oh->_sysc_cache = omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
269 if (!(oh->class->sysc->sysc_flags & SYSC_NO_CACHE))
270 oh->_int_flags |= _HWMOD_SYSCONFIG_LOADED;
276 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
277 * @v: OCP_SYSCONFIG value to write
278 * @oh: struct omap_hwmod *
280 * Write @v into the module class' OCP_SYSCONFIG register, if it has
281 * one. No return value.
283 static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
285 if (!oh->class->sysc) {
286 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh->name);
290 /* XXX ensure module interface clock is up */
292 /* Module might have lost context, always update cache and register */
294 omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
298 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
299 * @oh: struct omap_hwmod *
300 * @standbymode: MIDLEMODE field bits
301 * @v: pointer to register contents to modify
303 * Update the master standby mode bits in @v to be @standbymode for
304 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
305 * upon error or 0 upon success.
307 static int _set_master_standbymode(struct omap_hwmod *oh, u8 standbymode,
313 if (!oh->class->sysc ||
314 !(oh->class->sysc->sysc_flags & SYSC_HAS_MIDLEMODE))
317 if (!oh->class->sysc->sysc_fields) {
318 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
322 mstandby_shift = oh->class->sysc->sysc_fields->midle_shift;
323 mstandby_mask = (0x3 << mstandby_shift);
325 *v &= ~mstandby_mask;
326 *v |= __ffs(standbymode) << mstandby_shift;
332 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
333 * @oh: struct omap_hwmod *
334 * @idlemode: SIDLEMODE field bits
335 * @v: pointer to register contents to modify
337 * Update the slave idle mode bits in @v to be @idlemode for the @oh
338 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
341 static int _set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode, u32 *v)
346 if (!oh->class->sysc ||
347 !(oh->class->sysc->sysc_flags & SYSC_HAS_SIDLEMODE))
350 if (!oh->class->sysc->sysc_fields) {
351 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
355 sidle_shift = oh->class->sysc->sysc_fields->sidle_shift;
356 sidle_mask = (0x3 << sidle_shift);
359 *v |= __ffs(idlemode) << sidle_shift;
365 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
366 * @oh: struct omap_hwmod *
367 * @clockact: CLOCKACTIVITY field bits
368 * @v: pointer to register contents to modify
370 * Update the clockactivity mode bits in @v to be @clockact for the
371 * @oh hwmod. Used for additional powersaving on some modules. Does
372 * not write to the hardware. Returns -EINVAL upon error or 0 upon
375 static int _set_clockactivity(struct omap_hwmod *oh, u8 clockact, u32 *v)
380 if (!oh->class->sysc ||
381 !(oh->class->sysc->sysc_flags & SYSC_HAS_CLOCKACTIVITY))
384 if (!oh->class->sysc->sysc_fields) {
385 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
389 clkact_shift = oh->class->sysc->sysc_fields->clkact_shift;
390 clkact_mask = (0x3 << clkact_shift);
393 *v |= clockact << clkact_shift;
399 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
400 * @oh: struct omap_hwmod *
401 * @v: pointer to register contents to modify
403 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
404 * error or 0 upon success.
406 static int _set_softreset(struct omap_hwmod *oh, u32 *v)
410 if (!oh->class->sysc ||
411 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
414 if (!oh->class->sysc->sysc_fields) {
415 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
419 softrst_mask = (0x1 << oh->class->sysc->sysc_fields->srst_shift);
427 * _wait_softreset_complete - wait for an OCP softreset to complete
428 * @oh: struct omap_hwmod * to wait on
430 * Wait until the IP block represented by @oh reports that its OCP
431 * softreset is complete. This can be triggered by software (see
432 * _ocp_softreset()) or by hardware upon returning from off-mode (one
433 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
434 * microseconds. Returns the number of microseconds waited.
436 static int _wait_softreset_complete(struct omap_hwmod *oh)
438 struct omap_hwmod_class_sysconfig *sysc;
442 sysc = oh->class->sysc;
444 if (sysc->sysc_flags & SYSS_HAS_RESET_STATUS)
445 omap_test_timeout((omap_hwmod_read(oh, sysc->syss_offs)
446 & SYSS_RESETDONE_MASK),
447 MAX_MODULE_SOFTRESET_WAIT, c);
448 else if (sysc->sysc_flags & SYSC_HAS_RESET_STATUS) {
449 softrst_mask = (0x1 << sysc->sysc_fields->srst_shift);
450 omap_test_timeout(!(omap_hwmod_read(oh, sysc->sysc_offs)
452 MAX_MODULE_SOFTRESET_WAIT, c);
459 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
460 * @oh: struct omap_hwmod *
462 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
463 * of some modules. When the DMA must perform read/write accesses, the
464 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
465 * for power management, software must set the DMADISABLE bit back to 1.
467 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
468 * error or 0 upon success.
470 static int _set_dmadisable(struct omap_hwmod *oh)
475 if (!oh->class->sysc ||
476 !(oh->class->sysc->sysc_flags & SYSC_HAS_DMADISABLE))
479 if (!oh->class->sysc->sysc_fields) {
480 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
484 /* clocks must be on for this operation */
485 if (oh->_state != _HWMOD_STATE_ENABLED) {
486 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh->name);
490 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh->name);
494 (0x1 << oh->class->sysc->sysc_fields->dmadisable_shift);
495 v |= dmadisable_mask;
496 _write_sysconfig(v, oh);
502 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
503 * @oh: struct omap_hwmod *
504 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
505 * @v: pointer to register contents to modify
507 * Update the module autoidle bit in @v to be @autoidle for the @oh
508 * hwmod. The autoidle bit controls whether the module can gate
509 * internal clocks automatically when it isn't doing anything; the
510 * exact function of this bit varies on a per-module basis. This
511 * function does not write to the hardware. Returns -EINVAL upon
512 * error or 0 upon success.
514 static int _set_module_autoidle(struct omap_hwmod *oh, u8 autoidle,
520 if (!oh->class->sysc ||
521 !(oh->class->sysc->sysc_flags & SYSC_HAS_AUTOIDLE))
524 if (!oh->class->sysc->sysc_fields) {
525 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
529 autoidle_shift = oh->class->sysc->sysc_fields->autoidle_shift;
530 autoidle_mask = (0x1 << autoidle_shift);
532 *v &= ~autoidle_mask;
533 *v |= autoidle << autoidle_shift;
539 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
540 * @oh: struct omap_hwmod *
541 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
543 * Set or clear the I/O pad wakeup flag in the mux entries for the
544 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
545 * in memory. If the hwmod is currently idled, and the new idle
546 * values don't match the previous ones, this function will also
547 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
548 * currently idled, this function won't touch the hardware: the new
549 * mux settings are written to the SCM PADCTRL registers when the
550 * hwmod is idled. No return value.
552 static void _set_idle_ioring_wakeup(struct omap_hwmod *oh, bool set_wake)
554 struct omap_device_pad *pad;
559 if (!oh->mux || !oh->mux->enabled)
562 for (j = 0; j < oh->mux->nr_pads_dynamic; j++) {
563 pad = oh->mux->pads_dynamic[j];
565 if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP))
568 prev_idle = pad->idle;
571 pad->idle |= OMAP_WAKEUP_EN;
573 pad->idle &= ~OMAP_WAKEUP_EN;
575 if (prev_idle != pad->idle)
579 if (change && oh->_state == _HWMOD_STATE_IDLE)
580 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
584 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
585 * @oh: struct omap_hwmod *
587 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
588 * upon error or 0 upon success.
590 static int _enable_wakeup(struct omap_hwmod *oh, u32 *v)
592 if (!oh->class->sysc ||
593 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
594 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
595 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
598 if (!oh->class->sysc->sysc_fields) {
599 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
603 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
604 *v |= 0x1 << oh->class->sysc->sysc_fields->enwkup_shift;
606 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
607 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
608 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
609 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART_WKUP, v);
611 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
617 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
618 * @oh: struct omap_hwmod *
620 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
621 * upon error or 0 upon success.
623 static int _disable_wakeup(struct omap_hwmod *oh, u32 *v)
625 if (!oh->class->sysc ||
626 !((oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP) ||
627 (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP) ||
628 (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)))
631 if (!oh->class->sysc->sysc_fields) {
632 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh->name);
636 if (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)
637 *v &= ~(0x1 << oh->class->sysc->sysc_fields->enwkup_shift);
639 if (oh->class->sysc->idlemodes & SIDLE_SMART_WKUP)
640 _set_slave_idlemode(oh, HWMOD_IDLEMODE_SMART, v);
641 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
642 _set_master_standbymode(oh, HWMOD_IDLEMODE_SMART, v);
644 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
649 static struct clockdomain *_get_clkdm(struct omap_hwmod *oh)
651 struct clk_hw_omap *clk;
655 } else if (oh->_clk) {
656 clk = to_clk_hw_omap(__clk_get_hw(oh->_clk));
663 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
664 * @oh: struct omap_hwmod *
666 * Prevent the hardware module @oh from entering idle while the
667 * hardare module initiator @init_oh is active. Useful when a module
668 * will be accessed by a particular initiator (e.g., if a module will
669 * be accessed by the IVA, there should be a sleepdep between the IVA
670 * initiator and the module). Only applies to modules in smart-idle
671 * mode. If the clockdomain is marked as not needing autodeps, return
672 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
673 * passes along clkdm_add_sleepdep() value upon success.
675 static int _add_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
677 struct clockdomain *clkdm, *init_clkdm;
679 clkdm = _get_clkdm(oh);
680 init_clkdm = _get_clkdm(init_oh);
682 if (!clkdm || !init_clkdm)
685 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
688 return clkdm_add_sleepdep(clkdm, init_clkdm);
692 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
693 * @oh: struct omap_hwmod *
695 * Allow the hardware module @oh to enter idle while the hardare
696 * module initiator @init_oh is active. Useful when a module will not
697 * be accessed by a particular initiator (e.g., if a module will not
698 * be accessed by the IVA, there should be no sleepdep between the IVA
699 * initiator and the module). Only applies to modules in smart-idle
700 * mode. If the clockdomain is marked as not needing autodeps, return
701 * 0 without doing anything. Returns -EINVAL upon error or passes
702 * along clkdm_del_sleepdep() value upon success.
704 static int _del_initiator_dep(struct omap_hwmod *oh, struct omap_hwmod *init_oh)
706 struct clockdomain *clkdm, *init_clkdm;
708 clkdm = _get_clkdm(oh);
709 init_clkdm = _get_clkdm(init_oh);
711 if (!clkdm || !init_clkdm)
714 if (clkdm && clkdm->flags & CLKDM_NO_AUTODEPS)
717 return clkdm_del_sleepdep(clkdm, init_clkdm);
721 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
722 * @oh: struct omap_hwmod *
724 * Called from _init_clocks(). Populates the @oh _clk (main
725 * functional clock pointer) if a main_clk is present. Returns 0 on
726 * success or -EINVAL on error.
728 static int _init_main_clk(struct omap_hwmod *oh)
735 oh->_clk = clk_get(NULL, oh->main_clk);
736 if (IS_ERR(oh->_clk)) {
737 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
738 oh->name, oh->main_clk);
742 * HACK: This needs a re-visit once clk_prepare() is implemented
743 * to do something meaningful. Today its just a no-op.
744 * If clk_prepare() is used at some point to do things like
745 * voltage scaling etc, then this would have to be moved to
746 * some point where subsystems like i2c and pmic become
749 clk_prepare(oh->_clk);
752 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
753 oh->name, oh->main_clk);
759 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
760 * @oh: struct omap_hwmod *
762 * Called from _init_clocks(). Populates the @oh OCP slave interface
763 * clock pointers. Returns 0 on success or -EINVAL on error.
765 static int _init_interface_clks(struct omap_hwmod *oh)
767 struct omap_hwmod_ocp_if *os;
773 p = oh->slave_ports.next;
775 while (i < oh->slaves_cnt) {
776 os = _fetch_next_ocp_if(&p, &i);
780 c = clk_get(NULL, os->clk);
782 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
788 * HACK: This needs a re-visit once clk_prepare() is implemented
789 * to do something meaningful. Today its just a no-op.
790 * If clk_prepare() is used at some point to do things like
791 * voltage scaling etc, then this would have to be moved to
792 * some point where subsystems like i2c and pmic become
795 clk_prepare(os->_clk);
802 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
803 * @oh: struct omap_hwmod *
805 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
806 * clock pointers. Returns 0 on success or -EINVAL on error.
808 static int _init_opt_clks(struct omap_hwmod *oh)
810 struct omap_hwmod_opt_clk *oc;
815 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++) {
816 c = clk_get(NULL, oc->clk);
818 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
824 * HACK: This needs a re-visit once clk_prepare() is implemented
825 * to do something meaningful. Today its just a no-op.
826 * If clk_prepare() is used at some point to do things like
827 * voltage scaling etc, then this would have to be moved to
828 * some point where subsystems like i2c and pmic become
831 clk_prepare(oc->_clk);
838 * _enable_clocks - enable hwmod main clock and interface clocks
839 * @oh: struct omap_hwmod *
841 * Enables all clocks necessary for register reads and writes to succeed
842 * on the hwmod @oh. Returns 0.
844 static int _enable_clocks(struct omap_hwmod *oh)
846 struct omap_hwmod_ocp_if *os;
850 pr_debug("omap_hwmod: %s: enabling clocks\n", oh->name);
853 clk_enable(oh->_clk);
855 p = oh->slave_ports.next;
857 while (i < oh->slaves_cnt) {
858 os = _fetch_next_ocp_if(&p, &i);
860 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
861 clk_enable(os->_clk);
864 /* The opt clocks are controlled by the device driver. */
870 * _disable_clocks - disable hwmod main clock and interface clocks
871 * @oh: struct omap_hwmod *
873 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
875 static int _disable_clocks(struct omap_hwmod *oh)
877 struct omap_hwmod_ocp_if *os;
881 pr_debug("omap_hwmod: %s: disabling clocks\n", oh->name);
884 clk_disable(oh->_clk);
886 p = oh->slave_ports.next;
888 while (i < oh->slaves_cnt) {
889 os = _fetch_next_ocp_if(&p, &i);
891 if (os->_clk && (os->flags & OCPIF_SWSUP_IDLE))
892 clk_disable(os->_clk);
895 /* The opt clocks are controlled by the device driver. */
900 static void _enable_optional_clocks(struct omap_hwmod *oh)
902 struct omap_hwmod_opt_clk *oc;
905 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh->name);
907 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
909 pr_debug("omap_hwmod: enable %s:%s\n", oc->role,
910 __clk_get_name(oc->_clk));
911 clk_enable(oc->_clk);
915 static void _disable_optional_clocks(struct omap_hwmod *oh)
917 struct omap_hwmod_opt_clk *oc;
920 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh->name);
922 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
924 pr_debug("omap_hwmod: disable %s:%s\n", oc->role,
925 __clk_get_name(oc->_clk));
926 clk_disable(oc->_clk);
931 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
932 * @oh: struct omap_hwmod *
934 * Enables the PRCM module mode related to the hwmod @oh.
937 static void _omap4_enable_module(struct omap_hwmod *oh)
939 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
942 pr_debug("omap_hwmod: %s: %s: %d\n",
943 oh->name, __func__, oh->prcm.omap4.modulemode);
945 omap4_cminst_module_enable(oh->prcm.omap4.modulemode,
946 oh->clkdm->prcm_partition,
948 oh->clkdm->clkdm_offs,
949 oh->prcm.omap4.clkctrl_offs);
953 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
954 * @oh: struct omap_hwmod *
956 * Enables the PRCM module mode related to the hwmod @oh.
959 static void _am33xx_enable_module(struct omap_hwmod *oh)
961 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
964 pr_debug("omap_hwmod: %s: %s: %d\n",
965 oh->name, __func__, oh->prcm.omap4.modulemode);
967 am33xx_cm_module_enable(oh->prcm.omap4.modulemode, oh->clkdm->cm_inst,
968 oh->clkdm->clkdm_offs,
969 oh->prcm.omap4.clkctrl_offs);
973 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
974 * @oh: struct omap_hwmod *
976 * Wait for a module @oh to enter slave idle. Returns 0 if the module
977 * does not have an IDLEST bit or if the module successfully enters
978 * slave idle; otherwise, pass along the return value of the
979 * appropriate *_cm*_wait_module_idle() function.
981 static int _omap4_wait_target_disable(struct omap_hwmod *oh)
986 if (oh->_int_flags & _HWMOD_NO_MPU_PORT || !oh->clkdm)
989 if (oh->flags & HWMOD_NO_IDLEST)
992 return omap4_cminst_wait_module_idle(oh->clkdm->prcm_partition,
994 oh->clkdm->clkdm_offs,
995 oh->prcm.omap4.clkctrl_offs);
999 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
1000 * @oh: struct omap_hwmod *
1002 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1003 * does not have an IDLEST bit or if the module successfully enters
1004 * slave idle; otherwise, pass along the return value of the
1005 * appropriate *_cm*_wait_module_idle() function.
1007 static int _am33xx_wait_target_disable(struct omap_hwmod *oh)
1012 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
1015 if (oh->flags & HWMOD_NO_IDLEST)
1018 return am33xx_cm_wait_module_idle(oh->clkdm->cm_inst,
1019 oh->clkdm->clkdm_offs,
1020 oh->prcm.omap4.clkctrl_offs);
1024 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1025 * @oh: struct omap_hwmod *oh
1027 * Count and return the number of MPU IRQs associated with the hwmod
1028 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1031 static int _count_mpu_irqs(struct omap_hwmod *oh)
1033 struct omap_hwmod_irq_info *ohii;
1036 if (!oh || !oh->mpu_irqs)
1040 ohii = &oh->mpu_irqs[i++];
1041 } while (ohii->irq != -1);
1047 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1048 * @oh: struct omap_hwmod *oh
1050 * Count and return the number of SDMA request lines associated with
1051 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1054 static int _count_sdma_reqs(struct omap_hwmod *oh)
1056 struct omap_hwmod_dma_info *ohdi;
1059 if (!oh || !oh->sdma_reqs)
1063 ohdi = &oh->sdma_reqs[i++];
1064 } while (ohdi->dma_req != -1);
1070 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1071 * @oh: struct omap_hwmod *oh
1073 * Count and return the number of address space ranges associated with
1074 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1077 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if *os)
1079 struct omap_hwmod_addr_space *mem;
1082 if (!os || !os->addr)
1086 mem = &os->addr[i++];
1087 } while (mem->pa_start != mem->pa_end);
1093 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1094 * @oh: struct omap_hwmod * to operate on
1095 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1096 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1098 * Retrieve a MPU hardware IRQ line number named by @name associated
1099 * with the IP block pointed to by @oh. The IRQ number will be filled
1100 * into the address pointed to by @dma. When @name is non-null, the
1101 * IRQ line number associated with the named entry will be returned.
1102 * If @name is null, the first matching entry will be returned. Data
1103 * order is not meaningful in hwmod data, so callers are strongly
1104 * encouraged to use a non-null @name whenever possible to avoid
1105 * unpredictable effects if hwmod data is later added that causes data
1106 * ordering to change. Returns 0 upon success or a negative error
1109 static int _get_mpu_irq_by_name(struct omap_hwmod *oh, const char *name,
1119 while (oh->mpu_irqs[i].irq != -1) {
1120 if (name == oh->mpu_irqs[i].name ||
1121 !strcmp(name, oh->mpu_irqs[i].name)) {
1131 *irq = oh->mpu_irqs[i].irq;
1137 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1138 * @oh: struct omap_hwmod * to operate on
1139 * @name: pointer to the name of the SDMA request line to fetch (optional)
1140 * @dma: pointer to an unsigned int to store the request line ID to
1142 * Retrieve an SDMA request line ID named by @name on the IP block
1143 * pointed to by @oh. The ID will be filled into the address pointed
1144 * to by @dma. When @name is non-null, the request line ID associated
1145 * with the named entry will be returned. If @name is null, the first
1146 * matching entry will be returned. Data order is not meaningful in
1147 * hwmod data, so callers are strongly encouraged to use a non-null
1148 * @name whenever possible to avoid unpredictable effects if hwmod
1149 * data is later added that causes data ordering to change. Returns 0
1150 * upon success or a negative error code upon error.
1152 static int _get_sdma_req_by_name(struct omap_hwmod *oh, const char *name,
1162 while (oh->sdma_reqs[i].dma_req != -1) {
1163 if (name == oh->sdma_reqs[i].name ||
1164 !strcmp(name, oh->sdma_reqs[i].name)) {
1174 *dma = oh->sdma_reqs[i].dma_req;
1180 * _get_addr_space_by_name - fetch address space start & end by name
1181 * @oh: struct omap_hwmod * to operate on
1182 * @name: pointer to the name of the address space to fetch (optional)
1183 * @pa_start: pointer to a u32 to store the starting address to
1184 * @pa_end: pointer to a u32 to store the ending address to
1186 * Retrieve address space start and end addresses for the IP block
1187 * pointed to by @oh. The data will be filled into the addresses
1188 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1189 * address space data associated with the named entry will be
1190 * returned. If @name is null, the first matching entry will be
1191 * returned. Data order is not meaningful in hwmod data, so callers
1192 * are strongly encouraged to use a non-null @name whenever possible
1193 * to avoid unpredictable effects if hwmod data is later added that
1194 * causes data ordering to change. Returns 0 upon success or a
1195 * negative error code upon error.
1197 static int _get_addr_space_by_name(struct omap_hwmod *oh, const char *name,
1198 u32 *pa_start, u32 *pa_end)
1201 struct omap_hwmod_ocp_if *os;
1202 struct list_head *p = NULL;
1205 p = oh->slave_ports.next;
1208 while (i < oh->slaves_cnt) {
1209 os = _fetch_next_ocp_if(&p, &i);
1215 while (os->addr[j].pa_start != os->addr[j].pa_end) {
1216 if (name == os->addr[j].name ||
1217 !strcmp(name, os->addr[j].name)) {
1231 *pa_start = os->addr[j].pa_start;
1232 *pa_end = os->addr[j].pa_end;
1238 * _save_mpu_port_index - find and save the index to @oh's MPU port
1239 * @oh: struct omap_hwmod *
1241 * Determines the array index of the OCP slave port that the MPU uses
1242 * to address the device, and saves it into the struct omap_hwmod.
1243 * Intended to be called during hwmod registration only. No return
1246 static void __init _save_mpu_port_index(struct omap_hwmod *oh)
1248 struct omap_hwmod_ocp_if *os = NULL;
1249 struct list_head *p;
1255 oh->_int_flags |= _HWMOD_NO_MPU_PORT;
1257 p = oh->slave_ports.next;
1259 while (i < oh->slaves_cnt) {
1260 os = _fetch_next_ocp_if(&p, &i);
1261 if (os->user & OCP_USER_MPU) {
1263 oh->_int_flags &= ~_HWMOD_NO_MPU_PORT;
1272 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1273 * @oh: struct omap_hwmod *
1275 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1276 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1277 * communicate with the IP block. This interface need not be directly
1278 * connected to the MPU (and almost certainly is not), but is directly
1279 * connected to the IP block represented by @oh. Returns a pointer
1280 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1281 * error or if there does not appear to be a path from the MPU to this
1284 static struct omap_hwmod_ocp_if *_find_mpu_rt_port(struct omap_hwmod *oh)
1286 if (!oh || oh->_int_flags & _HWMOD_NO_MPU_PORT || oh->slaves_cnt == 0)
1289 return oh->_mpu_port;
1293 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1294 * @oh: struct omap_hwmod *
1296 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1297 * the register target MPU address space; or returns NULL upon error.
1299 static struct omap_hwmod_addr_space * __init _find_mpu_rt_addr_space(struct omap_hwmod *oh)
1301 struct omap_hwmod_ocp_if *os;
1302 struct omap_hwmod_addr_space *mem;
1303 int found = 0, i = 0;
1305 os = _find_mpu_rt_port(oh);
1306 if (!os || !os->addr)
1310 mem = &os->addr[i++];
1311 if (mem->flags & ADDR_TYPE_RT)
1313 } while (!found && mem->pa_start != mem->pa_end);
1315 return (found) ? mem : NULL;
1319 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1320 * @oh: struct omap_hwmod *
1322 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1323 * by @oh is set to indicate to the PRCM that the IP block is active.
1324 * Usually this means placing the module into smart-idle mode and
1325 * smart-standby, but if there is a bug in the automatic idle handling
1326 * for the IP block, it may need to be placed into the force-idle or
1327 * no-idle variants of these modes. No return value.
1329 static void _enable_sysc(struct omap_hwmod *oh)
1334 struct clockdomain *clkdm;
1336 if (!oh->class->sysc)
1340 * Wait until reset has completed, this is needed as the IP
1341 * block is reset automatically by hardware in some cases
1342 * (off-mode for example), and the drivers require the
1343 * IP to be ready when they access it
1345 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1346 _enable_optional_clocks(oh);
1347 _wait_softreset_complete(oh);
1348 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1349 _disable_optional_clocks(oh);
1351 v = oh->_sysc_cache;
1352 sf = oh->class->sysc->sysc_flags;
1354 clkdm = _get_clkdm(oh);
1355 if (sf & SYSC_HAS_SIDLEMODE) {
1356 clkdm_act = (clkdm && clkdm->flags & CLKDM_ACTIVE_WITH_MPU);
1357 if (clkdm_act && !(oh->class->sysc->idlemodes &
1358 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1359 idlemode = HWMOD_IDLEMODE_FORCE;
1361 idlemode = (oh->flags & HWMOD_SWSUP_SIDLE) ?
1362 HWMOD_IDLEMODE_NO : HWMOD_IDLEMODE_SMART;
1363 _set_slave_idlemode(oh, idlemode, &v);
1366 if (sf & SYSC_HAS_MIDLEMODE) {
1367 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1368 idlemode = HWMOD_IDLEMODE_NO;
1370 if (sf & SYSC_HAS_ENAWAKEUP)
1371 _enable_wakeup(oh, &v);
1372 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1373 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1375 idlemode = HWMOD_IDLEMODE_SMART;
1377 _set_master_standbymode(oh, idlemode, &v);
1381 * XXX The clock framework should handle this, by
1382 * calling into this code. But this must wait until the
1383 * clock structures are tagged with omap_hwmod entries
1385 if ((oh->flags & HWMOD_SET_DEFAULT_CLOCKACT) &&
1386 (sf & SYSC_HAS_CLOCKACTIVITY))
1387 _set_clockactivity(oh, oh->class->sysc->clockact, &v);
1389 /* If slave is in SMARTIDLE, also enable wakeup */
1390 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1391 _enable_wakeup(oh, &v);
1393 _write_sysconfig(v, oh);
1396 * Set the autoidle bit only after setting the smartidle bit
1397 * Setting this will not have any impact on the other modules.
1399 if (sf & SYSC_HAS_AUTOIDLE) {
1400 idlemode = (oh->flags & HWMOD_NO_OCP_AUTOIDLE) ?
1402 _set_module_autoidle(oh, idlemode, &v);
1403 _write_sysconfig(v, oh);
1408 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1409 * @oh: struct omap_hwmod *
1411 * If module is marked as SWSUP_SIDLE, force the module into slave
1412 * idle; otherwise, configure it for smart-idle. If module is marked
1413 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1414 * configure it for smart-standby. No return value.
1416 static void _idle_sysc(struct omap_hwmod *oh)
1421 if (!oh->class->sysc)
1424 v = oh->_sysc_cache;
1425 sf = oh->class->sysc->sysc_flags;
1427 if (sf & SYSC_HAS_SIDLEMODE) {
1428 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1429 if (oh->flags & HWMOD_SWSUP_SIDLE ||
1430 !(oh->class->sysc->idlemodes &
1431 (SIDLE_SMART | SIDLE_SMART_WKUP)))
1432 idlemode = HWMOD_IDLEMODE_FORCE;
1434 idlemode = HWMOD_IDLEMODE_SMART;
1435 _set_slave_idlemode(oh, idlemode, &v);
1438 if (sf & SYSC_HAS_MIDLEMODE) {
1439 if (oh->flags & HWMOD_SWSUP_MSTANDBY) {
1440 idlemode = HWMOD_IDLEMODE_FORCE;
1442 if (sf & SYSC_HAS_ENAWAKEUP)
1443 _enable_wakeup(oh, &v);
1444 if (oh->class->sysc->idlemodes & MSTANDBY_SMART_WKUP)
1445 idlemode = HWMOD_IDLEMODE_SMART_WKUP;
1447 idlemode = HWMOD_IDLEMODE_SMART;
1449 _set_master_standbymode(oh, idlemode, &v);
1452 /* If slave is in SMARTIDLE, also enable wakeup */
1453 if ((sf & SYSC_HAS_SIDLEMODE) && !(oh->flags & HWMOD_SWSUP_SIDLE))
1454 _enable_wakeup(oh, &v);
1456 _write_sysconfig(v, oh);
1460 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1461 * @oh: struct omap_hwmod *
1463 * Force the module into slave idle and master suspend. No return
1466 static void _shutdown_sysc(struct omap_hwmod *oh)
1471 if (!oh->class->sysc)
1474 v = oh->_sysc_cache;
1475 sf = oh->class->sysc->sysc_flags;
1477 if (sf & SYSC_HAS_SIDLEMODE)
1478 _set_slave_idlemode(oh, HWMOD_IDLEMODE_FORCE, &v);
1480 if (sf & SYSC_HAS_MIDLEMODE)
1481 _set_master_standbymode(oh, HWMOD_IDLEMODE_FORCE, &v);
1483 if (sf & SYSC_HAS_AUTOIDLE)
1484 _set_module_autoidle(oh, 1, &v);
1486 _write_sysconfig(v, oh);
1490 * _lookup - find an omap_hwmod by name
1491 * @name: find an omap_hwmod by name
1493 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1495 static struct omap_hwmod *_lookup(const char *name)
1497 struct omap_hwmod *oh, *temp_oh;
1501 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
1502 if (!strcmp(name, temp_oh->name)) {
1512 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1513 * @oh: struct omap_hwmod *
1515 * Convert a clockdomain name stored in a struct omap_hwmod into a
1516 * clockdomain pointer, and save it into the struct omap_hwmod.
1517 * Return -EINVAL if the clkdm_name lookup failed.
1519 static int _init_clkdm(struct omap_hwmod *oh)
1521 if (!oh->clkdm_name) {
1522 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh->name);
1526 oh->clkdm = clkdm_lookup(oh->clkdm_name);
1528 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1529 oh->name, oh->clkdm_name);
1533 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1534 oh->name, oh->clkdm_name);
1540 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1541 * well the clockdomain.
1542 * @oh: struct omap_hwmod *
1543 * @data: not used; pass NULL
1545 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1546 * Resolves all clock names embedded in the hwmod. Returns 0 on
1547 * success, or a negative error code on failure.
1549 static int _init_clocks(struct omap_hwmod *oh, void *data)
1553 if (oh->_state != _HWMOD_STATE_REGISTERED)
1556 pr_debug("omap_hwmod: %s: looking up clocks\n", oh->name);
1558 if (soc_ops.init_clkdm)
1559 ret |= soc_ops.init_clkdm(oh);
1561 ret |= _init_main_clk(oh);
1562 ret |= _init_interface_clks(oh);
1563 ret |= _init_opt_clks(oh);
1566 oh->_state = _HWMOD_STATE_CLKS_INITED;
1568 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh->name);
1574 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1575 * @oh: struct omap_hwmod *
1576 * @name: name of the reset line in the context of this hwmod
1577 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1579 * Return the bit position of the reset line that match the
1580 * input name. Return -ENOENT if not found.
1582 static int _lookup_hardreset(struct omap_hwmod *oh, const char *name,
1583 struct omap_hwmod_rst_info *ohri)
1587 for (i = 0; i < oh->rst_lines_cnt; i++) {
1588 const char *rst_line = oh->rst_lines[i].name;
1589 if (!strcmp(rst_line, name)) {
1590 ohri->rst_shift = oh->rst_lines[i].rst_shift;
1591 ohri->st_shift = oh->rst_lines[i].st_shift;
1592 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1593 oh->name, __func__, rst_line, ohri->rst_shift,
1604 * _assert_hardreset - assert the HW reset line of submodules
1605 * contained in the hwmod module.
1606 * @oh: struct omap_hwmod *
1607 * @name: name of the reset line to lookup and assert
1609 * Some IP like dsp, ipu or iva contain processor that require an HW
1610 * reset line to be assert / deassert in order to enable fully the IP.
1611 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1612 * asserting the hardreset line on the currently-booted SoC, or passes
1613 * along the return value from _lookup_hardreset() or the SoC's
1614 * assert_hardreset code.
1616 static int _assert_hardreset(struct omap_hwmod *oh, const char *name)
1618 struct omap_hwmod_rst_info ohri;
1624 if (!soc_ops.assert_hardreset)
1627 ret = _lookup_hardreset(oh, name, &ohri);
1631 ret = soc_ops.assert_hardreset(oh, &ohri);
1637 * _deassert_hardreset - deassert the HW reset line of submodules contained
1638 * in the hwmod module.
1639 * @oh: struct omap_hwmod *
1640 * @name: name of the reset line to look up and deassert
1642 * Some IP like dsp, ipu or iva contain processor that require an HW
1643 * reset line to be assert / deassert in order to enable fully the IP.
1644 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1645 * deasserting the hardreset line on the currently-booted SoC, or passes
1646 * along the return value from _lookup_hardreset() or the SoC's
1647 * deassert_hardreset code.
1649 static int _deassert_hardreset(struct omap_hwmod *oh, const char *name)
1651 struct omap_hwmod_rst_info ohri;
1658 if (!soc_ops.deassert_hardreset)
1661 ret = _lookup_hardreset(oh, name, &ohri);
1667 * A clockdomain must be in SW_SUP otherwise reset
1668 * might not be completed. The clockdomain can be set
1669 * in HW_AUTO only when the module become ready.
1671 hwsup = clkdm_in_hwsup(oh->clkdm);
1672 ret = clkdm_hwmod_enable(oh->clkdm, oh);
1674 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1675 oh->name, oh->clkdm->name, ret);
1681 if (soc_ops.enable_module)
1682 soc_ops.enable_module(oh);
1684 ret = soc_ops.deassert_hardreset(oh, &ohri);
1686 if (soc_ops.disable_module)
1687 soc_ops.disable_module(oh);
1688 _disable_clocks(oh);
1691 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh->name);
1695 * Set the clockdomain to HW_AUTO, assuming that the
1696 * previous state was HW_AUTO.
1698 if (oh->clkdm && hwsup)
1699 clkdm_allow_idle(oh->clkdm);
1702 clkdm_hwmod_disable(oh->clkdm, oh);
1709 * _read_hardreset - read the HW reset line state of submodules
1710 * contained in the hwmod module
1711 * @oh: struct omap_hwmod *
1712 * @name: name of the reset line to look up and read
1714 * Return the state of the reset line. Returns -EINVAL if @oh is
1715 * null, -ENOSYS if we have no way of reading the hardreset line
1716 * status on the currently-booted SoC, or passes along the return
1717 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1720 static int _read_hardreset(struct omap_hwmod *oh, const char *name)
1722 struct omap_hwmod_rst_info ohri;
1728 if (!soc_ops.is_hardreset_asserted)
1731 ret = _lookup_hardreset(oh, name, &ohri);
1735 return soc_ops.is_hardreset_asserted(oh, &ohri);
1739 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1740 * @oh: struct omap_hwmod *
1742 * If all hardreset lines associated with @oh are asserted, then return true.
1743 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1744 * associated with @oh are asserted, then return false.
1745 * This function is used to avoid executing some parts of the IP block
1746 * enable/disable sequence if its hardreset line is set.
1748 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod *oh)
1752 if (oh->rst_lines_cnt == 0)
1755 for (i = 0; i < oh->rst_lines_cnt; i++)
1756 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1759 if (oh->rst_lines_cnt == rst_cnt)
1766 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1768 * @oh: struct omap_hwmod *
1770 * If any hardreset lines associated with @oh are asserted, then
1771 * return true. Otherwise, if no hardreset lines associated with @oh
1772 * are asserted, or if @oh has no hardreset lines, then return false.
1773 * This function is used to avoid executing some parts of the IP block
1774 * enable/disable sequence if any hardreset line is set.
1776 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod *oh)
1781 for (i = 0; i < oh->rst_lines_cnt && rst_cnt == 0; i++)
1782 if (_read_hardreset(oh, oh->rst_lines[i].name) > 0)
1785 return (rst_cnt) ? true : false;
1789 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1790 * @oh: struct omap_hwmod *
1792 * Disable the PRCM module mode related to the hwmod @oh.
1793 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1795 static int _omap4_disable_module(struct omap_hwmod *oh)
1799 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1803 * Since integration code might still be doing something, only
1804 * disable if all lines are under hardreset.
1806 if (_are_any_hardreset_lines_asserted(oh))
1809 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1811 omap4_cminst_module_disable(oh->clkdm->prcm_partition,
1813 oh->clkdm->clkdm_offs,
1814 oh->prcm.omap4.clkctrl_offs);
1816 v = _omap4_wait_target_disable(oh);
1818 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1825 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1826 * @oh: struct omap_hwmod *
1828 * Disable the PRCM module mode related to the hwmod @oh.
1829 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1831 static int _am33xx_disable_module(struct omap_hwmod *oh)
1835 if (!oh->clkdm || !oh->prcm.omap4.modulemode)
1838 pr_debug("omap_hwmod: %s: %s\n", oh->name, __func__);
1840 if (_are_any_hardreset_lines_asserted(oh))
1843 am33xx_cm_module_disable(oh->clkdm->cm_inst, oh->clkdm->clkdm_offs,
1844 oh->prcm.omap4.clkctrl_offs);
1846 v = _am33xx_wait_target_disable(oh);
1848 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1855 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1856 * @oh: struct omap_hwmod *
1858 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1859 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1860 * reset this way, -EINVAL if the hwmod is in the wrong state,
1861 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1863 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1864 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1865 * use the SYSCONFIG softreset bit to provide the status.
1867 * Note that some IP like McBSP do have reset control but don't have
1870 static int _ocp_softreset(struct omap_hwmod *oh)
1876 if (!oh->class->sysc ||
1877 !(oh->class->sysc->sysc_flags & SYSC_HAS_SOFTRESET))
1880 /* clocks must be on for this operation */
1881 if (oh->_state != _HWMOD_STATE_ENABLED) {
1882 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1887 /* For some modules, all optionnal clocks need to be enabled as well */
1888 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1889 _enable_optional_clocks(oh);
1891 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
1893 v = oh->_sysc_cache;
1894 ret = _set_softreset(oh, &v);
1897 _write_sysconfig(v, oh);
1899 if (oh->class->sysc->srst_udelay)
1900 udelay(oh->class->sysc->srst_udelay);
1902 c = _wait_softreset_complete(oh);
1903 if (c == MAX_MODULE_SOFTRESET_WAIT)
1904 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1905 oh->name, MAX_MODULE_SOFTRESET_WAIT);
1907 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh->name, c);
1910 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1911 * _wait_target_ready() or _reset()
1914 ret = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
1917 if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
1918 _disable_optional_clocks(oh);
1924 * _reset - reset an omap_hwmod
1925 * @oh: struct omap_hwmod *
1927 * Resets an omap_hwmod @oh. If the module has a custom reset
1928 * function pointer defined, then call it to reset the IP block, and
1929 * pass along its return value to the caller. Otherwise, if the IP
1930 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1931 * associated with it, call a function to reset the IP block via that
1932 * method, and pass along the return value to the caller. Finally, if
1933 * the IP block has some hardreset lines associated with it, assert
1934 * all of those, but do _not_ deassert them. (This is because driver
1935 * authors have expressed an apparent requirement to control the
1936 * deassertion of the hardreset lines themselves.)
1938 * The default software reset mechanism for most OMAP IP blocks is
1939 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1940 * hwmods cannot be reset via this method. Some are not targets and
1941 * therefore have no OCP header registers to access. Others (like the
1942 * IVA) have idiosyncratic reset sequences. So for these relatively
1943 * rare cases, custom reset code can be supplied in the struct
1944 * omap_hwmod_class .reset function pointer.
1946 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1947 * does not prevent idling of the system. This is necessary for cases
1948 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1949 * kernel without disabling dma.
1951 * Passes along the return value from either _ocp_softreset() or the
1952 * custom reset function - these must return -EINVAL if the hwmod
1953 * cannot be reset this way or if the hwmod is in the wrong state,
1954 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1956 static int _reset(struct omap_hwmod *oh)
1960 pr_debug("omap_hwmod: %s: resetting\n", oh->name);
1962 if (oh->class->reset) {
1963 r = oh->class->reset(oh);
1965 if (oh->rst_lines_cnt > 0) {
1966 for (i = 0; i < oh->rst_lines_cnt; i++)
1967 _assert_hardreset(oh, oh->rst_lines[i].name);
1970 r = _ocp_softreset(oh);
1976 _set_dmadisable(oh);
1979 * OCP_SYSCONFIG bits need to be reprogrammed after a
1980 * softreset. The _enable() function should be split to avoid
1981 * the rewrite of the OCP_SYSCONFIG register.
1983 if (oh->class->sysc) {
1984 _update_sysc_cache(oh);
1992 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1994 * Call the appropriate PRM function to clear any logged I/O chain
1995 * wakeups and to reconfigure the chain. This apparently needs to be
1996 * done upon every mux change. Since hwmods can be concurrently
1997 * enabled and idled, hold a spinlock around the I/O chain
1998 * reconfiguration sequence. No return value.
2000 * XXX When the PRM code is moved to drivers, this function can be removed,
2001 * as the PRM infrastructure should abstract this.
2003 static void _reconfigure_io_chain(void)
2005 unsigned long flags;
2007 spin_lock_irqsave(&io_chain_lock, flags);
2009 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
2010 omap3xxx_prm_reconfigure_io_chain();
2011 else if (cpu_is_omap44xx())
2012 omap44xx_prm_reconfigure_io_chain();
2014 spin_unlock_irqrestore(&io_chain_lock, flags);
2018 * _omap4_update_context_lost - increment hwmod context loss counter if
2019 * hwmod context was lost, and clear hardware context loss reg
2020 * @oh: hwmod to check for context loss
2022 * If the PRCM indicates that the hwmod @oh lost context, increment
2023 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2024 * bits. No return value.
2026 static void _omap4_update_context_lost(struct omap_hwmod *oh)
2028 if (oh->prcm.omap4.flags & HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT)
2031 if (!prm_was_any_context_lost_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2032 oh->clkdm->pwrdm.ptr->prcm_offs,
2033 oh->prcm.omap4.context_offs))
2036 oh->prcm.omap4.context_lost_counter++;
2037 prm_clear_context_loss_flags_old(oh->clkdm->pwrdm.ptr->prcm_partition,
2038 oh->clkdm->pwrdm.ptr->prcm_offs,
2039 oh->prcm.omap4.context_offs);
2043 * _omap4_get_context_lost - get context loss counter for a hwmod
2044 * @oh: hwmod to get context loss counter for
2046 * Returns the in-memory context loss counter for a hwmod.
2048 static int _omap4_get_context_lost(struct omap_hwmod *oh)
2050 return oh->prcm.omap4.context_lost_counter;
2054 * _enable_preprogram - Pre-program an IP block during the _enable() process
2055 * @oh: struct omap_hwmod *
2057 * Some IP blocks (such as AESS) require some additional programming
2058 * after enable before they can enter idle. If a function pointer to
2059 * do so is present in the hwmod data, then call it and pass along the
2060 * return value; otherwise, return 0.
2062 static int __init _enable_preprogram(struct omap_hwmod *oh)
2064 if (!oh->class->enable_preprogram)
2067 return oh->class->enable_preprogram(oh);
2071 * _enable - enable an omap_hwmod
2072 * @oh: struct omap_hwmod *
2074 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2075 * register target. Returns -EINVAL if the hwmod is in the wrong
2076 * state or passes along the return value of _wait_target_ready().
2078 static int _enable(struct omap_hwmod *oh)
2083 pr_debug("omap_hwmod: %s: enabling\n", oh->name);
2086 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2087 * state at init. Now that someone is really trying to enable
2088 * them, just ensure that the hwmod mux is set.
2090 if (oh->_int_flags & _HWMOD_SKIP_ENABLE) {
2092 * If the caller has mux data populated, do the mux'ing
2093 * which wouldn't have been done as part of the _enable()
2094 * done during setup.
2097 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2099 oh->_int_flags &= ~_HWMOD_SKIP_ENABLE;
2103 if (oh->_state != _HWMOD_STATE_INITIALIZED &&
2104 oh->_state != _HWMOD_STATE_IDLE &&
2105 oh->_state != _HWMOD_STATE_DISABLED) {
2106 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2112 * If an IP block contains HW reset lines and all of them are
2113 * asserted, we let integration code associated with that
2114 * block handle the enable. We've received very little
2115 * information on what those driver authors need, and until
2116 * detailed information is provided and the driver code is
2117 * posted to the public lists, this is probably the best we
2120 if (_are_all_hardreset_lines_asserted(oh))
2123 /* Mux pins for device runtime if populated */
2124 if (oh->mux && (!oh->mux->enabled ||
2125 ((oh->_state == _HWMOD_STATE_IDLE) &&
2126 oh->mux->pads_dynamic))) {
2127 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
2128 _reconfigure_io_chain();
2131 _add_initiator_dep(oh, mpu_oh);
2135 * A clockdomain must be in SW_SUP before enabling
2136 * completely the module. The clockdomain can be set
2137 * in HW_AUTO only when the module become ready.
2139 hwsup = clkdm_in_hwsup(oh->clkdm) &&
2140 !clkdm_missing_idle_reporting(oh->clkdm);
2141 r = clkdm_hwmod_enable(oh->clkdm, oh);
2143 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2144 oh->name, oh->clkdm->name, r);
2150 if (soc_ops.enable_module)
2151 soc_ops.enable_module(oh);
2152 if (oh->flags & HWMOD_BLOCK_WFI)
2155 if (soc_ops.update_context_lost)
2156 soc_ops.update_context_lost(oh);
2158 r = (soc_ops.wait_target_ready) ? soc_ops.wait_target_ready(oh) :
2162 * Set the clockdomain to HW_AUTO only if the target is ready,
2163 * assuming that the previous state was HW_AUTO
2165 if (oh->clkdm && hwsup)
2166 clkdm_allow_idle(oh->clkdm);
2168 oh->_state = _HWMOD_STATE_ENABLED;
2170 /* Access the sysconfig only if the target is ready */
2171 if (oh->class->sysc) {
2172 if (!(oh->_int_flags & _HWMOD_SYSCONFIG_LOADED))
2173 _update_sysc_cache(oh);
2176 r = _enable_preprogram(oh);
2178 if (soc_ops.disable_module)
2179 soc_ops.disable_module(oh);
2180 _disable_clocks(oh);
2181 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2185 clkdm_hwmod_disable(oh->clkdm, oh);
2192 * _idle - idle an omap_hwmod
2193 * @oh: struct omap_hwmod *
2195 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2196 * no further work. Returns -EINVAL if the hwmod is in the wrong
2197 * state or returns 0.
2199 static int _idle(struct omap_hwmod *oh)
2201 pr_debug("omap_hwmod: %s: idling\n", oh->name);
2203 if (oh->_state != _HWMOD_STATE_ENABLED) {
2204 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2209 if (_are_all_hardreset_lines_asserted(oh))
2212 if (oh->class->sysc)
2214 _del_initiator_dep(oh, mpu_oh);
2216 if (oh->flags & HWMOD_BLOCK_WFI)
2218 if (soc_ops.disable_module)
2219 soc_ops.disable_module(oh);
2222 * The module must be in idle mode before disabling any parents
2223 * clocks. Otherwise, the parent clock might be disabled before
2224 * the module transition is done, and thus will prevent the
2225 * transition to complete properly.
2227 _disable_clocks(oh);
2229 clkdm_hwmod_disable(oh->clkdm, oh);
2231 /* Mux pins for device idle if populated */
2232 if (oh->mux && oh->mux->pads_dynamic) {
2233 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
2234 _reconfigure_io_chain();
2237 oh->_state = _HWMOD_STATE_IDLE;
2243 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2244 * @oh: struct omap_hwmod *
2245 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2247 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2248 * local copy. Intended to be used by drivers that require
2249 * direct manipulation of the AUTOIDLE bits.
2250 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2251 * along the return value from _set_module_autoidle().
2253 * Any users of this function should be scrutinized carefully.
2255 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod *oh, u8 autoidle)
2259 unsigned long flags;
2261 if (!oh || oh->_state != _HWMOD_STATE_ENABLED)
2264 spin_lock_irqsave(&oh->_lock, flags);
2266 v = oh->_sysc_cache;
2268 retval = _set_module_autoidle(oh, autoidle, &v);
2271 _write_sysconfig(v, oh);
2273 spin_unlock_irqrestore(&oh->_lock, flags);
2279 * _shutdown - shutdown an omap_hwmod
2280 * @oh: struct omap_hwmod *
2282 * Shut down an omap_hwmod @oh. This should be called when the driver
2283 * used for the hwmod is removed or unloaded or if the driver is not
2284 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2285 * state or returns 0.
2287 static int _shutdown(struct omap_hwmod *oh)
2292 if (oh->_state != _HWMOD_STATE_IDLE &&
2293 oh->_state != _HWMOD_STATE_ENABLED) {
2294 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2299 if (_are_all_hardreset_lines_asserted(oh))
2302 pr_debug("omap_hwmod: %s: disabling\n", oh->name);
2304 if (oh->class->pre_shutdown) {
2305 prev_state = oh->_state;
2306 if (oh->_state == _HWMOD_STATE_IDLE)
2308 ret = oh->class->pre_shutdown(oh);
2310 if (prev_state == _HWMOD_STATE_IDLE)
2316 if (oh->class->sysc) {
2317 if (oh->_state == _HWMOD_STATE_IDLE)
2322 /* clocks and deps are already disabled in idle */
2323 if (oh->_state == _HWMOD_STATE_ENABLED) {
2324 _del_initiator_dep(oh, mpu_oh);
2325 /* XXX what about the other system initiators here? dma, dsp */
2326 if (oh->flags & HWMOD_BLOCK_WFI)
2328 if (soc_ops.disable_module)
2329 soc_ops.disable_module(oh);
2330 _disable_clocks(oh);
2332 clkdm_hwmod_disable(oh->clkdm, oh);
2334 /* XXX Should this code also force-disable the optional clocks? */
2336 for (i = 0; i < oh->rst_lines_cnt; i++)
2337 _assert_hardreset(oh, oh->rst_lines[i].name);
2339 /* Mux pins to safe mode or use populated off mode values */
2341 omap_hwmod_mux(oh->mux, _HWMOD_STATE_DISABLED);
2343 oh->_state = _HWMOD_STATE_DISABLED;
2349 * _init_mpu_rt_base - populate the virtual address for a hwmod
2350 * @oh: struct omap_hwmod * to locate the virtual address
2352 * Cache the virtual address used by the MPU to access this IP block's
2353 * registers. This address is needed early so the OCP registers that
2354 * are part of the device's address space can be ioremapped properly.
2357 static void __init _init_mpu_rt_base(struct omap_hwmod *oh, void *data)
2359 struct omap_hwmod_addr_space *mem;
2360 void __iomem *va_start;
2365 _save_mpu_port_index(oh);
2367 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
2370 mem = _find_mpu_rt_addr_space(oh);
2372 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2377 va_start = ioremap(mem->pa_start, mem->pa_end - mem->pa_start);
2379 pr_err("omap_hwmod: %s: Could not ioremap\n", oh->name);
2383 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2384 oh->name, va_start);
2386 oh->_mpu_rt_va = va_start;
2390 * _init - initialize internal data for the hwmod @oh
2391 * @oh: struct omap_hwmod *
2394 * Look up the clocks and the address space used by the MPU to access
2395 * registers belonging to the hwmod @oh. @oh must already be
2396 * registered at this point. This is the first of two phases for
2397 * hwmod initialization. Code called here does not touch any hardware
2398 * registers, it simply prepares internal data structures. Returns 0
2399 * upon success or if the hwmod isn't registered, or -EINVAL upon
2402 static int __init _init(struct omap_hwmod *oh, void *data)
2406 if (oh->_state != _HWMOD_STATE_REGISTERED)
2409 _init_mpu_rt_base(oh, NULL);
2411 r = _init_clocks(oh, NULL);
2413 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh->name);
2417 oh->_state = _HWMOD_STATE_INITIALIZED;
2423 * _setup_iclk_autoidle - configure an IP block's interface clocks
2424 * @oh: struct omap_hwmod *
2426 * Set up the module's interface clocks. XXX This function is still mostly
2427 * a stub; implementing this properly requires iclk autoidle usecounting in
2428 * the clock code. No return value.
2430 static void __init _setup_iclk_autoidle(struct omap_hwmod *oh)
2432 struct omap_hwmod_ocp_if *os;
2433 struct list_head *p;
2435 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2438 p = oh->slave_ports.next;
2440 while (i < oh->slaves_cnt) {
2441 os = _fetch_next_ocp_if(&p, &i);
2445 if (os->flags & OCPIF_SWSUP_IDLE) {
2446 /* XXX omap_iclk_deny_idle(c); */
2448 /* XXX omap_iclk_allow_idle(c); */
2449 clk_enable(os->_clk);
2457 * _setup_reset - reset an IP block during the setup process
2458 * @oh: struct omap_hwmod *
2460 * Reset the IP block corresponding to the hwmod @oh during the setup
2461 * process. The IP block is first enabled so it can be successfully
2462 * reset. Returns 0 upon success or a negative error code upon
2465 static int __init _setup_reset(struct omap_hwmod *oh)
2469 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2472 if (oh->flags & HWMOD_EXT_OPT_MAIN_CLK)
2475 if (oh->rst_lines_cnt == 0) {
2478 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2479 oh->name, oh->_state);
2484 if (!(oh->flags & HWMOD_INIT_NO_RESET))
2491 * _setup_postsetup - transition to the appropriate state after _setup
2492 * @oh: struct omap_hwmod *
2494 * Place an IP block represented by @oh into a "post-setup" state --
2495 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2496 * this function is called at the end of _setup().) The postsetup
2497 * state for an IP block can be changed by calling
2498 * omap_hwmod_enter_postsetup_state() early in the boot process,
2499 * before one of the omap_hwmod_setup*() functions are called for the
2502 * The IP block stays in this state until a PM runtime-based driver is
2503 * loaded for that IP block. A post-setup state of IDLE is
2504 * appropriate for almost all IP blocks with runtime PM-enabled
2505 * drivers, since those drivers are able to enable the IP block. A
2506 * post-setup state of ENABLED is appropriate for kernels with PM
2507 * runtime disabled. The DISABLED state is appropriate for unusual IP
2508 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2509 * included, since the WDTIMER starts running on reset and will reset
2510 * the MPU if left active.
2512 * This post-setup mechanism is deprecated. Once all of the OMAP
2513 * drivers have been converted to use PM runtime, and all of the IP
2514 * block data and interconnect data is available to the hwmod code, it
2515 * should be possible to replace this mechanism with a "lazy reset"
2516 * arrangement. In a "lazy reset" setup, each IP block is enabled
2517 * when the driver first probes, then all remaining IP blocks without
2518 * drivers are either shut down or enabled after the drivers have
2519 * loaded. However, this cannot take place until the above
2520 * preconditions have been met, since otherwise the late reset code
2521 * has no way of knowing which IP blocks are in use by drivers, and
2522 * which ones are unused.
2526 static void __init _setup_postsetup(struct omap_hwmod *oh)
2530 if (oh->rst_lines_cnt > 0)
2533 postsetup_state = oh->_postsetup_state;
2534 if (postsetup_state == _HWMOD_STATE_UNKNOWN)
2535 postsetup_state = _HWMOD_STATE_ENABLED;
2538 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2539 * it should be set by the core code as a runtime flag during startup
2541 if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
2542 (postsetup_state == _HWMOD_STATE_IDLE)) {
2543 oh->_int_flags |= _HWMOD_SKIP_ENABLE;
2544 postsetup_state = _HWMOD_STATE_ENABLED;
2547 if (postsetup_state == _HWMOD_STATE_IDLE)
2549 else if (postsetup_state == _HWMOD_STATE_DISABLED)
2551 else if (postsetup_state != _HWMOD_STATE_ENABLED)
2552 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2553 oh->name, postsetup_state);
2559 * _setup - prepare IP block hardware for use
2560 * @oh: struct omap_hwmod *
2561 * @n: (unused, pass NULL)
2563 * Configure the IP block represented by @oh. This may include
2564 * enabling the IP block, resetting it, and placing it into a
2565 * post-setup state, depending on the type of IP block and applicable
2566 * flags. IP blocks are reset to prevent any previous configuration
2567 * by the bootloader or previous operating system from interfering
2568 * with power management or other parts of the system. The reset can
2569 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2570 * two phases for hwmod initialization. Code called here generally
2571 * affects the IP block hardware, or system integration hardware
2572 * associated with the IP block. Returns 0.
2574 static int __init _setup(struct omap_hwmod *oh, void *data)
2576 if (oh->_state != _HWMOD_STATE_INITIALIZED)
2579 _setup_iclk_autoidle(oh);
2581 if (!_setup_reset(oh))
2582 _setup_postsetup(oh);
2588 * _register - register a struct omap_hwmod
2589 * @oh: struct omap_hwmod *
2591 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2592 * already has been registered by the same name; -EINVAL if the
2593 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2594 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2595 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2598 * XXX The data should be copied into bootmem, so the original data
2599 * should be marked __initdata and freed after init. This would allow
2600 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2601 * that the copy process would be relatively complex due to the large number
2604 static int __init _register(struct omap_hwmod *oh)
2606 if (!oh || !oh->name || !oh->class || !oh->class->name ||
2607 (oh->_state != _HWMOD_STATE_UNKNOWN))
2610 pr_debug("omap_hwmod: %s: registering\n", oh->name);
2612 if (_lookup(oh->name))
2615 list_add_tail(&oh->node, &omap_hwmod_list);
2617 INIT_LIST_HEAD(&oh->master_ports);
2618 INIT_LIST_HEAD(&oh->slave_ports);
2619 spin_lock_init(&oh->_lock);
2621 oh->_state = _HWMOD_STATE_REGISTERED;
2624 * XXX Rather than doing a strcmp(), this should test a flag
2625 * set in the hwmod data, inserted by the autogenerator code.
2627 if (!strcmp(oh->name, MPU_INITIATOR_NAME))
2634 * _alloc_links - return allocated memory for hwmod links
2635 * @ml: pointer to a struct omap_hwmod_link * for the master link
2636 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2638 * Return pointers to two struct omap_hwmod_link records, via the
2639 * addresses pointed to by @ml and @sl. Will first attempt to return
2640 * memory allocated as part of a large initial block, but if that has
2641 * been exhausted, will allocate memory itself. Since ideally this
2642 * second allocation path will never occur, the number of these
2643 * 'supplemental' allocations will be logged when debugging is
2644 * enabled. Returns 0.
2646 static int __init _alloc_links(struct omap_hwmod_link **ml,
2647 struct omap_hwmod_link **sl)
2651 if ((free_ls + LINKS_PER_OCP_IF) <= max_ls) {
2652 *ml = &linkspace[free_ls++];
2653 *sl = &linkspace[free_ls++];
2657 sz = sizeof(struct omap_hwmod_link) * LINKS_PER_OCP_IF;
2660 *ml = alloc_bootmem(sz);
2664 *sl = (void *)(*ml) + sizeof(struct omap_hwmod_link);
2667 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2668 ls_supp * LINKS_PER_OCP_IF);
2674 * _add_link - add an interconnect between two IP blocks
2675 * @oi: pointer to a struct omap_hwmod_ocp_if record
2677 * Add struct omap_hwmod_link records connecting the master IP block
2678 * specified in @oi->master to @oi, and connecting the slave IP block
2679 * specified in @oi->slave to @oi. This code is assumed to run before
2680 * preemption or SMP has been enabled, thus avoiding the need for
2681 * locking in this code. Changes to this assumption will require
2682 * additional locking. Returns 0.
2684 static int __init _add_link(struct omap_hwmod_ocp_if *oi)
2686 struct omap_hwmod_link *ml, *sl;
2688 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi->master->name,
2691 _alloc_links(&ml, &sl);
2694 INIT_LIST_HEAD(&ml->node);
2695 list_add(&ml->node, &oi->master->master_ports);
2696 oi->master->masters_cnt++;
2699 INIT_LIST_HEAD(&sl->node);
2700 list_add(&sl->node, &oi->slave->slave_ports);
2701 oi->slave->slaves_cnt++;
2707 * _register_link - register a struct omap_hwmod_ocp_if
2708 * @oi: struct omap_hwmod_ocp_if *
2710 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2711 * has already been registered; -EINVAL if @oi is NULL or if the
2712 * record pointed to by @oi is missing required fields; or 0 upon
2715 * XXX The data should be copied into bootmem, so the original data
2716 * should be marked __initdata and freed after init. This would allow
2717 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2719 static int __init _register_link(struct omap_hwmod_ocp_if *oi)
2721 if (!oi || !oi->master || !oi->slave || !oi->user)
2724 if (oi->_int_flags & _OCPIF_INT_FLAGS_REGISTERED)
2727 pr_debug("omap_hwmod: registering link from %s to %s\n",
2728 oi->master->name, oi->slave->name);
2731 * Register the connected hwmods, if they haven't been
2732 * registered already
2734 if (oi->master->_state != _HWMOD_STATE_REGISTERED)
2735 _register(oi->master);
2737 if (oi->slave->_state != _HWMOD_STATE_REGISTERED)
2738 _register(oi->slave);
2742 oi->_int_flags |= _OCPIF_INT_FLAGS_REGISTERED;
2748 * _alloc_linkspace - allocate large block of hwmod links
2749 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2751 * Allocate a large block of struct omap_hwmod_link records. This
2752 * improves boot time significantly by avoiding the need to allocate
2753 * individual records one by one. If the number of records to
2754 * allocate in the block hasn't been manually specified, this function
2755 * will count the number of struct omap_hwmod_ocp_if records in @ois
2756 * and use that to determine the allocation size. For SoC families
2757 * that require multiple list registrations, such as OMAP3xxx, this
2758 * estimation process isn't optimal, so manual estimation is advised
2759 * in those cases. Returns -EEXIST if the allocation has already occurred
2760 * or 0 upon success.
2762 static int __init _alloc_linkspace(struct omap_hwmod_ocp_if **ois)
2768 WARN(1, "linkspace already allocated\n");
2774 max_ls += LINKS_PER_OCP_IF;
2776 sz = sizeof(struct omap_hwmod_link) * max_ls;
2778 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2779 __func__, sz, max_ls);
2781 linkspace = alloc_bootmem(sz);
2783 memset(linkspace, 0, sz);
2788 /* Static functions intended only for use in soc_ops field function pointers */
2791 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2792 * @oh: struct omap_hwmod *
2794 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2795 * does not have an IDLEST bit or if the module successfully leaves
2796 * slave idle; otherwise, pass along the return value of the
2797 * appropriate *_cm*_wait_module_ready() function.
2799 static int _omap2xxx_wait_target_ready(struct omap_hwmod *oh)
2804 if (oh->flags & HWMOD_NO_IDLEST)
2807 if (!_find_mpu_rt_port(oh))
2810 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2812 return omap2xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2813 oh->prcm.omap2.idlest_reg_id,
2814 oh->prcm.omap2.idlest_idle_bit);
2818 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2819 * @oh: struct omap_hwmod *
2821 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2822 * does not have an IDLEST bit or if the module successfully leaves
2823 * slave idle; otherwise, pass along the return value of the
2824 * appropriate *_cm*_wait_module_ready() function.
2826 static int _omap3xxx_wait_target_ready(struct omap_hwmod *oh)
2831 if (oh->flags & HWMOD_NO_IDLEST)
2834 if (!_find_mpu_rt_port(oh))
2837 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2839 return omap3xxx_cm_wait_module_ready(oh->prcm.omap2.module_offs,
2840 oh->prcm.omap2.idlest_reg_id,
2841 oh->prcm.omap2.idlest_idle_bit);
2845 * _omap4_wait_target_ready - wait for a module to leave slave idle
2846 * @oh: struct omap_hwmod *
2848 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2849 * does not have an IDLEST bit or if the module successfully leaves
2850 * slave idle; otherwise, pass along the return value of the
2851 * appropriate *_cm*_wait_module_ready() function.
2853 static int _omap4_wait_target_ready(struct omap_hwmod *oh)
2858 if (oh->flags & HWMOD_NO_IDLEST || !oh->clkdm)
2861 if (!_find_mpu_rt_port(oh))
2864 /* XXX check module SIDLEMODE, hardreset status */
2866 return omap4_cminst_wait_module_ready(oh->clkdm->prcm_partition,
2868 oh->clkdm->clkdm_offs,
2869 oh->prcm.omap4.clkctrl_offs);
2873 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2874 * @oh: struct omap_hwmod *
2876 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2877 * does not have an IDLEST bit or if the module successfully leaves
2878 * slave idle; otherwise, pass along the return value of the
2879 * appropriate *_cm*_wait_module_ready() function.
2881 static int _am33xx_wait_target_ready(struct omap_hwmod *oh)
2883 if (!oh || !oh->clkdm)
2886 if (oh->flags & HWMOD_NO_IDLEST)
2889 if (!_find_mpu_rt_port(oh))
2892 /* XXX check module SIDLEMODE, hardreset status */
2894 return am33xx_cm_wait_module_ready(oh->clkdm->cm_inst,
2895 oh->clkdm->clkdm_offs,
2896 oh->prcm.omap4.clkctrl_offs);
2900 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2901 * @oh: struct omap_hwmod * to assert hardreset
2902 * @ohri: hardreset line data
2904 * Call omap2_prm_assert_hardreset() with parameters extracted from
2905 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2906 * use as an soc_ops function pointer. Passes along the return value
2907 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2908 * for removal when the PRM code is moved into drivers/.
2910 static int _omap2_assert_hardreset(struct omap_hwmod *oh,
2911 struct omap_hwmod_rst_info *ohri)
2913 return omap2_prm_assert_hardreset(oh->prcm.omap2.module_offs,
2918 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2919 * @oh: struct omap_hwmod * to deassert hardreset
2920 * @ohri: hardreset line data
2922 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2923 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2924 * use as an soc_ops function pointer. Passes along the return value
2925 * from omap2_prm_deassert_hardreset(). XXX This function is
2926 * scheduled for removal when the PRM code is moved into drivers/.
2928 static int _omap2_deassert_hardreset(struct omap_hwmod *oh,
2929 struct omap_hwmod_rst_info *ohri)
2931 return omap2_prm_deassert_hardreset(oh->prcm.omap2.module_offs,
2937 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2938 * @oh: struct omap_hwmod * to test hardreset
2939 * @ohri: hardreset line data
2941 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2942 * from the hwmod @oh and the hardreset line data @ohri. Only
2943 * intended for use as an soc_ops function pointer. Passes along the
2944 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2945 * function is scheduled for removal when the PRM code is moved into
2948 static int _omap2_is_hardreset_asserted(struct omap_hwmod *oh,
2949 struct omap_hwmod_rst_info *ohri)
2951 return omap2_prm_is_hardreset_asserted(oh->prcm.omap2.module_offs,
2956 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2957 * @oh: struct omap_hwmod * to assert hardreset
2958 * @ohri: hardreset line data
2960 * Call omap4_prminst_assert_hardreset() with parameters extracted
2961 * from the hwmod @oh and the hardreset line data @ohri. Only
2962 * intended for use as an soc_ops function pointer. Passes along the
2963 * return value from omap4_prminst_assert_hardreset(). XXX This
2964 * function is scheduled for removal when the PRM code is moved into
2967 static int _omap4_assert_hardreset(struct omap_hwmod *oh,
2968 struct omap_hwmod_rst_info *ohri)
2973 return omap4_prminst_assert_hardreset(ohri->rst_shift,
2974 oh->clkdm->pwrdm.ptr->prcm_partition,
2975 oh->clkdm->pwrdm.ptr->prcm_offs,
2976 oh->prcm.omap4.rstctrl_offs);
2980 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2981 * @oh: struct omap_hwmod * to deassert hardreset
2982 * @ohri: hardreset line data
2984 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2985 * from the hwmod @oh and the hardreset line data @ohri. Only
2986 * intended for use as an soc_ops function pointer. Passes along the
2987 * return value from omap4_prminst_deassert_hardreset(). XXX This
2988 * function is scheduled for removal when the PRM code is moved into
2991 static int _omap4_deassert_hardreset(struct omap_hwmod *oh,
2992 struct omap_hwmod_rst_info *ohri)
2998 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2999 oh->name, ohri->name);
3000 return omap4_prminst_deassert_hardreset(ohri->rst_shift,
3001 oh->clkdm->pwrdm.ptr->prcm_partition,
3002 oh->clkdm->pwrdm.ptr->prcm_offs,
3003 oh->prcm.omap4.rstctrl_offs);
3007 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3008 * @oh: struct omap_hwmod * to test hardreset
3009 * @ohri: hardreset line data
3011 * Call omap4_prminst_is_hardreset_asserted() with parameters
3012 * extracted from the hwmod @oh and the hardreset line data @ohri.
3013 * Only intended for use as an soc_ops function pointer. Passes along
3014 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3015 * This function is scheduled for removal when the PRM code is moved
3018 static int _omap4_is_hardreset_asserted(struct omap_hwmod *oh,
3019 struct omap_hwmod_rst_info *ohri)
3024 return omap4_prminst_is_hardreset_asserted(ohri->rst_shift,
3025 oh->clkdm->pwrdm.ptr->prcm_partition,
3026 oh->clkdm->pwrdm.ptr->prcm_offs,
3027 oh->prcm.omap4.rstctrl_offs);
3031 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3032 * @oh: struct omap_hwmod * to assert hardreset
3033 * @ohri: hardreset line data
3035 * Call am33xx_prminst_assert_hardreset() with parameters extracted
3036 * from the hwmod @oh and the hardreset line data @ohri. Only
3037 * intended for use as an soc_ops function pointer. Passes along the
3038 * return value from am33xx_prminst_assert_hardreset(). XXX This
3039 * function is scheduled for removal when the PRM code is moved into
3042 static int _am33xx_assert_hardreset(struct omap_hwmod *oh,
3043 struct omap_hwmod_rst_info *ohri)
3046 return am33xx_prm_assert_hardreset(ohri->rst_shift,
3047 oh->clkdm->pwrdm.ptr->prcm_offs,
3048 oh->prcm.omap4.rstctrl_offs);
3052 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3053 * @oh: struct omap_hwmod * to deassert hardreset
3054 * @ohri: hardreset line data
3056 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3057 * from the hwmod @oh and the hardreset line data @ohri. Only
3058 * intended for use as an soc_ops function pointer. Passes along the
3059 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3060 * function is scheduled for removal when the PRM code is moved into
3063 static int _am33xx_deassert_hardreset(struct omap_hwmod *oh,
3064 struct omap_hwmod_rst_info *ohri)
3066 return am33xx_prm_deassert_hardreset(ohri->rst_shift,
3068 oh->clkdm->pwrdm.ptr->prcm_offs,
3069 oh->prcm.omap4.rstctrl_offs,
3070 oh->prcm.omap4.rstst_offs);
3074 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
3075 * @oh: struct omap_hwmod * to test hardreset
3076 * @ohri: hardreset line data
3078 * Call am33xx_prminst_is_hardreset_asserted() with parameters
3079 * extracted from the hwmod @oh and the hardreset line data @ohri.
3080 * Only intended for use as an soc_ops function pointer. Passes along
3081 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
3082 * This function is scheduled for removal when the PRM code is moved
3085 static int _am33xx_is_hardreset_asserted(struct omap_hwmod *oh,
3086 struct omap_hwmod_rst_info *ohri)
3088 return am33xx_prm_is_hardreset_asserted(ohri->rst_shift,
3089 oh->clkdm->pwrdm.ptr->prcm_offs,
3090 oh->prcm.omap4.rstctrl_offs);
3093 /* Public functions */
3095 u32 omap_hwmod_read(struct omap_hwmod *oh, u16 reg_offs)
3097 if (oh->flags & HWMOD_16BIT_REG)
3098 return __raw_readw(oh->_mpu_rt_va + reg_offs);
3100 return __raw_readl(oh->_mpu_rt_va + reg_offs);
3103 void omap_hwmod_write(u32 v, struct omap_hwmod *oh, u16 reg_offs)
3105 if (oh->flags & HWMOD_16BIT_REG)
3106 __raw_writew(v, oh->_mpu_rt_va + reg_offs);
3108 __raw_writel(v, oh->_mpu_rt_va + reg_offs);
3112 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3113 * @oh: struct omap_hwmod *
3115 * This is a public function exposed to drivers. Some drivers may need to do
3116 * some settings before and after resetting the device. Those drivers after
3117 * doing the necessary settings could use this function to start a reset by
3118 * setting the SYSCONFIG.SOFTRESET bit.
3120 int omap_hwmod_softreset(struct omap_hwmod *oh)
3125 if (!oh || !(oh->_sysc_cache))
3128 v = oh->_sysc_cache;
3129 ret = _set_softreset(oh, &v);
3132 _write_sysconfig(v, oh);
3139 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
3140 * @oh: struct omap_hwmod *
3141 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
3143 * Sets the IP block's OCP slave idlemode in hardware, and updates our
3144 * local copy. Intended to be used by drivers that have some erratum
3145 * that requires direct manipulation of the SIDLEMODE bits. Returns
3146 * -EINVAL if @oh is null, or passes along the return value from
3147 * _set_slave_idlemode().
3149 * XXX Does this function have any current users? If not, we should
3150 * remove it; it is better to let the rest of the hwmod code handle this.
3151 * Any users of this function should be scrutinized carefully.
3153 int omap_hwmod_set_slave_idlemode(struct omap_hwmod *oh, u8 idlemode)
3161 v = oh->_sysc_cache;
3163 retval = _set_slave_idlemode(oh, idlemode, &v);
3165 _write_sysconfig(v, oh);
3171 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3172 * @name: name of the omap_hwmod to look up
3174 * Given a @name of an omap_hwmod, return a pointer to the registered
3175 * struct omap_hwmod *, or NULL upon error.
3177 struct omap_hwmod *omap_hwmod_lookup(const char *name)
3179 struct omap_hwmod *oh;
3190 * omap_hwmod_for_each - call function for each registered omap_hwmod
3191 * @fn: pointer to a callback function
3192 * @data: void * data to pass to callback function
3194 * Call @fn for each registered omap_hwmod, passing @data to each
3195 * function. @fn must return 0 for success or any other value for
3196 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3197 * will stop and the non-zero return value will be passed to the
3198 * caller of omap_hwmod_for_each(). @fn is called with
3199 * omap_hwmod_for_each() held.
3201 int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data),
3204 struct omap_hwmod *temp_oh;
3210 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3211 ret = (*fn)(temp_oh, data);
3220 * omap_hwmod_register_links - register an array of hwmod links
3221 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3223 * Intended to be called early in boot before the clock framework is
3224 * initialized. If @ois is not null, will register all omap_hwmods
3225 * listed in @ois that are valid for this chip. Returns -EINVAL if
3226 * omap_hwmod_init() hasn't been called before calling this function,
3227 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3230 int __init omap_hwmod_register_links(struct omap_hwmod_ocp_if **ois)
3241 if (_alloc_linkspace(ois)) {
3242 pr_err("omap_hwmod: could not allocate link space\n");
3249 r = _register_link(ois[i]);
3250 WARN(r && r != -EEXIST,
3251 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3252 ois[i]->master->name, ois[i]->slave->name, r);
3259 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3260 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3262 * If the hwmod data corresponding to the MPU subsystem IP block
3263 * hasn't been initialized and set up yet, do so now. This must be
3264 * done first since sleep dependencies may be added from other hwmods
3265 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3268 static void __init _ensure_mpu_hwmod_is_setup(struct omap_hwmod *oh)
3270 if (!mpu_oh || mpu_oh->_state == _HWMOD_STATE_UNKNOWN)
3271 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3272 __func__, MPU_INITIATOR_NAME);
3273 else if (mpu_oh->_state == _HWMOD_STATE_REGISTERED && oh != mpu_oh)
3274 omap_hwmod_setup_one(MPU_INITIATOR_NAME);
3278 * omap_hwmod_setup_one - set up a single hwmod
3279 * @oh_name: const char * name of the already-registered hwmod to set up
3281 * Initialize and set up a single hwmod. Intended to be used for a
3282 * small number of early devices, such as the timer IP blocks used for
3283 * the scheduler clock. Must be called after omap2_clk_init().
3284 * Resolves the struct clk names to struct clk pointers for each
3285 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3286 * -EINVAL upon error or 0 upon success.
3288 int __init omap_hwmod_setup_one(const char *oh_name)
3290 struct omap_hwmod *oh;
3292 pr_debug("omap_hwmod: %s: %s\n", oh_name, __func__);
3294 oh = _lookup(oh_name);
3296 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name);
3300 _ensure_mpu_hwmod_is_setup(oh);
3309 * omap_hwmod_setup_all - set up all registered IP blocks
3311 * Initialize and set up all IP blocks registered with the hwmod code.
3312 * Must be called after omap2_clk_init(). Resolves the struct clk
3313 * names to struct clk pointers for each registered omap_hwmod. Also
3314 * calls _setup() on each hwmod. Returns 0 upon success.
3316 static int __init omap_hwmod_setup_all(void)
3318 _ensure_mpu_hwmod_is_setup(NULL);
3320 omap_hwmod_for_each(_init, NULL);
3321 omap_hwmod_for_each(_setup, NULL);
3325 omap_core_initcall(omap_hwmod_setup_all);
3328 * omap_hwmod_enable - enable an omap_hwmod
3329 * @oh: struct omap_hwmod *
3331 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3332 * Returns -EINVAL on error or passes along the return value from _enable().
3334 int omap_hwmod_enable(struct omap_hwmod *oh)
3337 unsigned long flags;
3342 spin_lock_irqsave(&oh->_lock, flags);
3344 spin_unlock_irqrestore(&oh->_lock, flags);
3350 * omap_hwmod_idle - idle an omap_hwmod
3351 * @oh: struct omap_hwmod *
3353 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3354 * Returns -EINVAL on error or passes along the return value from _idle().
3356 int omap_hwmod_idle(struct omap_hwmod *oh)
3358 unsigned long flags;
3363 spin_lock_irqsave(&oh->_lock, flags);
3365 spin_unlock_irqrestore(&oh->_lock, flags);
3371 * omap_hwmod_shutdown - shutdown an omap_hwmod
3372 * @oh: struct omap_hwmod *
3374 * Shutdown an omap_hwmod @oh. Intended to be called by
3375 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3376 * the return value from _shutdown().
3378 int omap_hwmod_shutdown(struct omap_hwmod *oh)
3380 unsigned long flags;
3385 spin_lock_irqsave(&oh->_lock, flags);
3387 spin_unlock_irqrestore(&oh->_lock, flags);
3393 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3394 * @oh: struct omap_hwmod *oh
3396 * Intended to be called by the omap_device code.
3398 int omap_hwmod_enable_clocks(struct omap_hwmod *oh)
3400 unsigned long flags;
3402 spin_lock_irqsave(&oh->_lock, flags);
3404 spin_unlock_irqrestore(&oh->_lock, flags);
3410 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3411 * @oh: struct omap_hwmod *oh
3413 * Intended to be called by the omap_device code.
3415 int omap_hwmod_disable_clocks(struct omap_hwmod *oh)
3417 unsigned long flags;
3419 spin_lock_irqsave(&oh->_lock, flags);
3420 _disable_clocks(oh);
3421 spin_unlock_irqrestore(&oh->_lock, flags);
3427 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3428 * @oh: struct omap_hwmod *oh
3430 * Intended to be called by drivers and core code when all posted
3431 * writes to a device must complete before continuing further
3432 * execution (for example, after clearing some device IRQSTATUS
3435 * XXX what about targets with multiple OCP threads?
3437 void omap_hwmod_ocp_barrier(struct omap_hwmod *oh)
3441 if (!oh->class->sysc || !oh->class->sysc->sysc_flags) {
3442 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3448 * Forces posted writes to complete on the OCP thread handling
3451 omap_hwmod_read(oh, oh->class->sysc->sysc_offs);
3455 * omap_hwmod_reset - reset the hwmod
3456 * @oh: struct omap_hwmod *
3458 * Under some conditions, a driver may wish to reset the entire device.
3459 * Called from omap_device code. Returns -EINVAL on error or passes along
3460 * the return value from _reset().
3462 int omap_hwmod_reset(struct omap_hwmod *oh)
3465 unsigned long flags;
3470 spin_lock_irqsave(&oh->_lock, flags);
3472 spin_unlock_irqrestore(&oh->_lock, flags);
3478 * IP block data retrieval functions
3482 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3483 * @oh: struct omap_hwmod *
3484 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3486 * Count the number of struct resource array elements necessary to
3487 * contain omap_hwmod @oh resources. Intended to be called by code
3488 * that registers omap_devices. Intended to be used to determine the
3489 * size of a dynamically-allocated struct resource array, before
3490 * calling omap_hwmod_fill_resources(). Returns the number of struct
3491 * resource array elements needed.
3493 * XXX This code is not optimized. It could attempt to merge adjacent
3497 int omap_hwmod_count_resources(struct omap_hwmod *oh, unsigned long flags)
3501 if (flags & IORESOURCE_IRQ)
3502 ret += _count_mpu_irqs(oh);
3504 if (flags & IORESOURCE_DMA)
3505 ret += _count_sdma_reqs(oh);
3507 if (flags & IORESOURCE_MEM) {
3509 struct omap_hwmod_ocp_if *os;
3510 struct list_head *p = oh->slave_ports.next;
3512 while (i < oh->slaves_cnt) {
3513 os = _fetch_next_ocp_if(&p, &i);
3514 ret += _count_ocp_if_addr_spaces(os);
3522 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3523 * @oh: struct omap_hwmod *
3524 * @res: pointer to the first element of an array of struct resource to fill
3526 * Fill the struct resource array @res with resource data from the
3527 * omap_hwmod @oh. Intended to be called by code that registers
3528 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3529 * number of array elements filled.
3531 int omap_hwmod_fill_resources(struct omap_hwmod *oh, struct resource *res)
3533 struct omap_hwmod_ocp_if *os;
3534 struct list_head *p;
3535 int i, j, mpu_irqs_cnt, sdma_reqs_cnt, addr_cnt;
3538 /* For each IRQ, DMA, memory area, fill in array.*/
3540 mpu_irqs_cnt = _count_mpu_irqs(oh);
3541 for (i = 0; i < mpu_irqs_cnt; i++) {
3542 (res + r)->name = (oh->mpu_irqs + i)->name;
3543 (res + r)->start = (oh->mpu_irqs + i)->irq;
3544 (res + r)->end = (oh->mpu_irqs + i)->irq;
3545 (res + r)->flags = IORESOURCE_IRQ;
3549 sdma_reqs_cnt = _count_sdma_reqs(oh);
3550 for (i = 0; i < sdma_reqs_cnt; i++) {
3551 (res + r)->name = (oh->sdma_reqs + i)->name;
3552 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3553 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3554 (res + r)->flags = IORESOURCE_DMA;
3558 p = oh->slave_ports.next;
3561 while (i < oh->slaves_cnt) {
3562 os = _fetch_next_ocp_if(&p, &i);
3563 addr_cnt = _count_ocp_if_addr_spaces(os);
3565 for (j = 0; j < addr_cnt; j++) {
3566 (res + r)->name = (os->addr + j)->name;
3567 (res + r)->start = (os->addr + j)->pa_start;
3568 (res + r)->end = (os->addr + j)->pa_end;
3569 (res + r)->flags = IORESOURCE_MEM;
3578 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3579 * @oh: struct omap_hwmod *
3580 * @res: pointer to the array of struct resource to fill
3582 * Fill the struct resource array @res with dma resource data from the
3583 * omap_hwmod @oh. Intended to be called by code that registers
3584 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3585 * number of array elements filled.
3587 int omap_hwmod_fill_dma_resources(struct omap_hwmod *oh, struct resource *res)
3589 int i, sdma_reqs_cnt;
3592 sdma_reqs_cnt = _count_sdma_reqs(oh);
3593 for (i = 0; i < sdma_reqs_cnt; i++) {
3594 (res + r)->name = (oh->sdma_reqs + i)->name;
3595 (res + r)->start = (oh->sdma_reqs + i)->dma_req;
3596 (res + r)->end = (oh->sdma_reqs + i)->dma_req;
3597 (res + r)->flags = IORESOURCE_DMA;
3605 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3606 * @oh: struct omap_hwmod * to operate on
3607 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3608 * @name: pointer to the name of the data to fetch (optional)
3609 * @rsrc: pointer to a struct resource, allocated by the caller
3611 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3612 * data for the IP block pointed to by @oh. The data will be filled
3613 * into a struct resource record pointed to by @rsrc. The struct
3614 * resource must be allocated by the caller. When @name is non-null,
3615 * the data associated with the matching entry in the IRQ/SDMA/address
3616 * space hwmod data arrays will be returned. If @name is null, the
3617 * first array entry will be returned. Data order is not meaningful
3618 * in hwmod data, so callers are strongly encouraged to use a non-null
3619 * @name whenever possible to avoid unpredictable effects if hwmod
3620 * data is later added that causes data ordering to change. This
3621 * function is only intended for use by OMAP core code. Device
3622 * drivers should not call this function - the appropriate bus-related
3623 * data accessor functions should be used instead. Returns 0 upon
3624 * success or a negative error code upon error.
3626 int omap_hwmod_get_resource_byname(struct omap_hwmod *oh, unsigned int type,
3627 const char *name, struct resource *rsrc)
3630 unsigned int irq, dma;
3631 u32 pa_start, pa_end;
3636 if (type == IORESOURCE_IRQ) {
3637 r = _get_mpu_irq_by_name(oh, name, &irq);
3643 } else if (type == IORESOURCE_DMA) {
3644 r = _get_sdma_req_by_name(oh, name, &dma);
3650 } else if (type == IORESOURCE_MEM) {
3651 r = _get_addr_space_by_name(oh, name, &pa_start, &pa_end);
3655 rsrc->start = pa_start;
3668 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3669 * @oh: struct omap_hwmod *
3671 * Return the powerdomain pointer associated with the OMAP module
3672 * @oh's main clock. If @oh does not have a main clk, return the
3673 * powerdomain associated with the interface clock associated with the
3674 * module's MPU port. (XXX Perhaps this should use the SDMA port
3675 * instead?) Returns NULL on error, or a struct powerdomain * on
3678 struct powerdomain *omap_hwmod_get_pwrdm(struct omap_hwmod *oh)
3681 struct omap_hwmod_ocp_if *oi;
3682 struct clockdomain *clkdm;
3683 struct clk_hw_omap *clk;
3689 return oh->clkdm->pwrdm.ptr;
3694 oi = _find_mpu_rt_port(oh);
3700 clk = to_clk_hw_omap(__clk_get_hw(c));
3705 return clkdm->pwrdm.ptr;
3709 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3710 * @oh: struct omap_hwmod *
3712 * Returns the virtual address corresponding to the beginning of the
3713 * module's register target, in the address range that is intended to
3714 * be used by the MPU. Returns the virtual address upon success or NULL
3717 void __iomem *omap_hwmod_get_mpu_rt_va(struct omap_hwmod *oh)
3722 if (oh->_int_flags & _HWMOD_NO_MPU_PORT)
3725 if (oh->_state == _HWMOD_STATE_UNKNOWN)
3728 return oh->_mpu_rt_va;
3732 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3733 * @oh: struct omap_hwmod *
3734 * @init_oh: struct omap_hwmod * (initiator)
3736 * Add a sleep dependency between the initiator @init_oh and @oh.
3737 * Intended to be called by DSP/Bridge code via platform_data for the
3738 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3739 * code needs to add/del initiator dependencies dynamically
3740 * before/after accessing a device. Returns the return value from
3741 * _add_initiator_dep().
3743 * XXX Keep a usecount in the clockdomain code
3745 int omap_hwmod_add_initiator_dep(struct omap_hwmod *oh,
3746 struct omap_hwmod *init_oh)
3748 return _add_initiator_dep(oh, init_oh);
3752 * XXX what about functions for drivers to save/restore ocp_sysconfig
3753 * for context save/restore operations?
3757 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3758 * @oh: struct omap_hwmod *
3759 * @init_oh: struct omap_hwmod * (initiator)
3761 * Remove a sleep dependency between the initiator @init_oh and @oh.
3762 * Intended to be called by DSP/Bridge code via platform_data for the
3763 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3764 * code needs to add/del initiator dependencies dynamically
3765 * before/after accessing a device. Returns the return value from
3766 * _del_initiator_dep().
3768 * XXX Keep a usecount in the clockdomain code
3770 int omap_hwmod_del_initiator_dep(struct omap_hwmod *oh,
3771 struct omap_hwmod *init_oh)
3773 return _del_initiator_dep(oh, init_oh);
3777 * omap_hwmod_enable_wakeup - allow device to wake up the system
3778 * @oh: struct omap_hwmod *
3780 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3781 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3782 * this IP block if it has dynamic mux entries. Eventually this
3783 * should set PRCM wakeup registers to cause the PRCM to receive
3784 * wakeup events from the module. Does not set any wakeup routing
3785 * registers beyond this point - if the module is to wake up any other
3786 * module or subsystem, that must be set separately. Called by
3787 * omap_device code. Returns -EINVAL on error or 0 upon success.
3789 int omap_hwmod_enable_wakeup(struct omap_hwmod *oh)
3791 unsigned long flags;
3794 spin_lock_irqsave(&oh->_lock, flags);
3796 if (oh->class->sysc &&
3797 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3798 v = oh->_sysc_cache;
3799 _enable_wakeup(oh, &v);
3800 _write_sysconfig(v, oh);
3803 _set_idle_ioring_wakeup(oh, true);
3804 spin_unlock_irqrestore(&oh->_lock, flags);
3810 * omap_hwmod_disable_wakeup - prevent device from waking the system
3811 * @oh: struct omap_hwmod *
3813 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3814 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3815 * events for this IP block if it has dynamic mux entries. Eventually
3816 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3817 * wakeup events from the module. Does not set any wakeup routing
3818 * registers beyond this point - if the module is to wake up any other
3819 * module or subsystem, that must be set separately. Called by
3820 * omap_device code. Returns -EINVAL on error or 0 upon success.
3822 int omap_hwmod_disable_wakeup(struct omap_hwmod *oh)
3824 unsigned long flags;
3827 spin_lock_irqsave(&oh->_lock, flags);
3829 if (oh->class->sysc &&
3830 (oh->class->sysc->sysc_flags & SYSC_HAS_ENAWAKEUP)) {
3831 v = oh->_sysc_cache;
3832 _disable_wakeup(oh, &v);
3833 _write_sysconfig(v, oh);
3836 _set_idle_ioring_wakeup(oh, false);
3837 spin_unlock_irqrestore(&oh->_lock, flags);
3843 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3844 * contained in the hwmod module.
3845 * @oh: struct omap_hwmod *
3846 * @name: name of the reset line to lookup and assert
3848 * Some IP like dsp, ipu or iva contain processor that require
3849 * an HW reset line to be assert / deassert in order to enable fully
3850 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3851 * yet supported on this OMAP; otherwise, passes along the return value
3852 * from _assert_hardreset().
3854 int omap_hwmod_assert_hardreset(struct omap_hwmod *oh, const char *name)
3857 unsigned long flags;
3862 spin_lock_irqsave(&oh->_lock, flags);
3863 ret = _assert_hardreset(oh, name);
3864 spin_unlock_irqrestore(&oh->_lock, flags);
3870 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3871 * contained in the hwmod module.
3872 * @oh: struct omap_hwmod *
3873 * @name: name of the reset line to look up and deassert
3875 * Some IP like dsp, ipu or iva contain processor that require
3876 * an HW reset line to be assert / deassert in order to enable fully
3877 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3878 * yet supported on this OMAP; otherwise, passes along the return value
3879 * from _deassert_hardreset().
3881 int omap_hwmod_deassert_hardreset(struct omap_hwmod *oh, const char *name)
3884 unsigned long flags;
3889 spin_lock_irqsave(&oh->_lock, flags);
3890 ret = _deassert_hardreset(oh, name);
3891 spin_unlock_irqrestore(&oh->_lock, flags);
3897 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3898 * contained in the hwmod module
3899 * @oh: struct omap_hwmod *
3900 * @name: name of the reset line to look up and read
3902 * Return the current state of the hwmod @oh's reset line named @name:
3903 * returns -EINVAL upon parameter error or if this operation
3904 * is unsupported on the current OMAP; otherwise, passes along the return
3905 * value from _read_hardreset().
3907 int omap_hwmod_read_hardreset(struct omap_hwmod *oh, const char *name)
3910 unsigned long flags;
3915 spin_lock_irqsave(&oh->_lock, flags);
3916 ret = _read_hardreset(oh, name);
3917 spin_unlock_irqrestore(&oh->_lock, flags);
3924 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3925 * @classname: struct omap_hwmod_class name to search for
3926 * @fn: callback function pointer to call for each hwmod in class @classname
3927 * @user: arbitrary context data to pass to the callback function
3929 * For each omap_hwmod of class @classname, call @fn.
3930 * If the callback function returns something other than
3931 * zero, the iterator is terminated, and the callback function's return
3932 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3933 * if @classname or @fn are NULL, or passes back the error code from @fn.
3935 int omap_hwmod_for_each_by_class(const char *classname,
3936 int (*fn)(struct omap_hwmod *oh,
3940 struct omap_hwmod *temp_oh;
3943 if (!classname || !fn)
3946 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3947 __func__, classname);
3949 list_for_each_entry(temp_oh, &omap_hwmod_list, node) {
3950 if (!strcmp(temp_oh->class->name, classname)) {
3951 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3952 __func__, temp_oh->name);
3953 ret = (*fn)(temp_oh, user);
3960 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3967 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3968 * @oh: struct omap_hwmod *
3969 * @state: state that _setup() should leave the hwmod in
3971 * Sets the hwmod state that @oh will enter at the end of _setup()
3972 * (called by omap_hwmod_setup_*()). See also the documentation
3973 * for _setup_postsetup(), above. Returns 0 upon success or
3974 * -EINVAL if there is a problem with the arguments or if the hwmod is
3975 * in the wrong state.
3977 int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state)
3980 unsigned long flags;
3985 if (state != _HWMOD_STATE_DISABLED &&
3986 state != _HWMOD_STATE_ENABLED &&
3987 state != _HWMOD_STATE_IDLE)
3990 spin_lock_irqsave(&oh->_lock, flags);
3992 if (oh->_state != _HWMOD_STATE_REGISTERED) {
3997 oh->_postsetup_state = state;
4001 spin_unlock_irqrestore(&oh->_lock, flags);
4007 * omap_hwmod_get_context_loss_count - get lost context count
4008 * @oh: struct omap_hwmod *
4010 * Returns the context loss count of associated @oh
4011 * upon success, or zero if no context loss data is available.
4013 * On OMAP4, this queries the per-hwmod context loss register,
4014 * assuming one exists. If not, or on OMAP2/3, this queries the
4015 * enclosing powerdomain context loss count.
4017 int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh)
4019 struct powerdomain *pwrdm;
4022 if (soc_ops.get_context_lost)
4023 return soc_ops.get_context_lost(oh);
4025 pwrdm = omap_hwmod_get_pwrdm(oh);
4027 ret = pwrdm_get_context_loss_count(pwrdm);
4033 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
4034 * @oh: struct omap_hwmod *
4036 * Prevent the hwmod @oh from being reset during the setup process.
4037 * Intended for use by board-*.c files on boards with devices that
4038 * cannot tolerate being reset. Must be called before the hwmod has
4039 * been set up. Returns 0 upon success or negative error code upon
4042 int omap_hwmod_no_setup_reset(struct omap_hwmod *oh)
4047 if (oh->_state != _HWMOD_STATE_REGISTERED) {
4048 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
4053 oh->flags |= HWMOD_INIT_NO_RESET;
4059 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
4060 * @oh: struct omap_hwmod * containing hwmod mux entries
4061 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
4062 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
4064 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
4065 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
4066 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
4067 * this function is not called for a given pad_idx, then the ISR
4068 * associated with @oh's first MPU IRQ will be triggered when an I/O
4069 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
4070 * the _dynamic or wakeup_ entry: if there are other entries not
4071 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
4072 * entries are NOT COUNTED in the dynamic pad index. This function
4073 * must be called separately for each pad that requires its interrupt
4074 * to be re-routed this way. Returns -EINVAL if there is an argument
4075 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
4076 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
4078 * XXX This function interface is fragile. Rather than using array
4079 * indexes, which are subject to unpredictable change, it should be
4080 * using hwmod IRQ names, and some other stable key for the hwmod mux
4083 int omap_hwmod_pad_route_irq(struct omap_hwmod *oh, int pad_idx, int irq_idx)
4089 if (!oh || !oh->mux || !oh->mpu_irqs || pad_idx < 0 ||
4090 pad_idx >= oh->mux->nr_pads_dynamic)
4093 /* Check the number of available mpu_irqs */
4094 for (nr_irqs = 0; oh->mpu_irqs[nr_irqs].irq >= 0; nr_irqs++)
4097 if (irq_idx >= nr_irqs)
4100 if (!oh->mux->irqs) {
4101 /* XXX What frees this? */
4102 oh->mux->irqs = kzalloc(sizeof(int) * oh->mux->nr_pads_dynamic,
4107 oh->mux->irqs[pad_idx] = irq_idx;
4113 * omap_hwmod_init - initialize the hwmod code
4115 * Sets up some function pointers needed by the hwmod code to operate on the
4116 * currently-booted SoC. Intended to be called once during kernel init
4117 * before any hwmods are registered. No return value.
4119 void __init omap_hwmod_init(void)
4121 if (cpu_is_omap24xx()) {
4122 soc_ops.wait_target_ready = _omap2xxx_wait_target_ready;
4123 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4124 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4125 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4126 } else if (cpu_is_omap34xx()) {
4127 soc_ops.wait_target_ready = _omap3xxx_wait_target_ready;
4128 soc_ops.assert_hardreset = _omap2_assert_hardreset;
4129 soc_ops.deassert_hardreset = _omap2_deassert_hardreset;
4130 soc_ops.is_hardreset_asserted = _omap2_is_hardreset_asserted;
4131 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
4132 soc_ops.enable_module = _omap4_enable_module;
4133 soc_ops.disable_module = _omap4_disable_module;
4134 soc_ops.wait_target_ready = _omap4_wait_target_ready;
4135 soc_ops.assert_hardreset = _omap4_assert_hardreset;
4136 soc_ops.deassert_hardreset = _omap4_deassert_hardreset;
4137 soc_ops.is_hardreset_asserted = _omap4_is_hardreset_asserted;
4138 soc_ops.init_clkdm = _init_clkdm;
4139 soc_ops.update_context_lost = _omap4_update_context_lost;
4140 soc_ops.get_context_lost = _omap4_get_context_lost;
4141 } else if (soc_is_am33xx()) {
4142 soc_ops.enable_module = _am33xx_enable_module;
4143 soc_ops.disable_module = _am33xx_disable_module;
4144 soc_ops.wait_target_ready = _am33xx_wait_target_ready;
4145 soc_ops.assert_hardreset = _am33xx_assert_hardreset;
4146 soc_ops.deassert_hardreset = _am33xx_deassert_hardreset;
4147 soc_ops.is_hardreset_asserted = _am33xx_is_hardreset_asserted;
4148 soc_ops.init_clkdm = _init_clkdm;
4150 WARN(1, "omap_hwmod: unknown SoC type\n");
4157 * omap_hwmod_get_main_clk - get pointer to main clock name
4158 * @oh: struct omap_hwmod *
4160 * Returns the main clock name assocated with @oh upon success,
4161 * or NULL if @oh is NULL.
4163 const char *omap_hwmod_get_main_clk(struct omap_hwmod *oh)
4168 return oh->main_clk;