2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk-provider.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
141 #include <linux/cpu.h>
142 #include <linux/of.h>
143 #include <linux/of_address.h>
145 #include <asm/system_misc.h>
148 #include "omap_hwmod.h"
152 #include "clockdomain.h"
153 #include "powerdomain.h"
156 #include "cminst44xx.h"
162 #include "prminst44xx.h"
166 /* Name of the OMAP hwmod for the MPU */
167 #define MPU_INITIATOR_NAME "mpu"
170 * Number of struct omap_hwmod_link records per struct
171 * omap_hwmod_ocp_if record (master->slave and slave->master)
173 #define LINKS_PER_OCP_IF 2
176 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
177 * @enable_module: function to enable a module (via MODULEMODE)
178 * @disable_module: function to disable a module (via MODULEMODE)
180 * XXX Eventually this functionality will be hidden inside the PRM/CM
181 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
182 * conditionals in this code.
184 struct omap_hwmod_soc_ops
{
185 void (*enable_module
)(struct omap_hwmod
*oh
);
186 int (*disable_module
)(struct omap_hwmod
*oh
);
187 int (*wait_target_ready
)(struct omap_hwmod
*oh
);
188 int (*assert_hardreset
)(struct omap_hwmod
*oh
,
189 struct omap_hwmod_rst_info
*ohri
);
190 int (*deassert_hardreset
)(struct omap_hwmod
*oh
,
191 struct omap_hwmod_rst_info
*ohri
);
192 int (*is_hardreset_asserted
)(struct omap_hwmod
*oh
,
193 struct omap_hwmod_rst_info
*ohri
);
194 int (*init_clkdm
)(struct omap_hwmod
*oh
);
195 void (*update_context_lost
)(struct omap_hwmod
*oh
);
196 int (*get_context_lost
)(struct omap_hwmod
*oh
);
199 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
200 static struct omap_hwmod_soc_ops soc_ops
;
202 /* omap_hwmod_list contains all registered struct omap_hwmods */
203 static LIST_HEAD(omap_hwmod_list
);
205 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
206 static struct omap_hwmod
*mpu_oh
;
208 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
209 static DEFINE_SPINLOCK(io_chain_lock
);
212 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
213 * allocated from - used to reduce the number of small memory
214 * allocations, which has a significant impact on performance
216 static struct omap_hwmod_link
*linkspace
;
219 * free_ls, max_ls: array indexes into linkspace; representing the
220 * next free struct omap_hwmod_link index, and the maximum number of
221 * struct omap_hwmod_link records allocated (respectively)
223 static unsigned short free_ls
, max_ls
, ls_supp
;
225 /* inited: set to true once the hwmod code is initialized */
228 /* Private functions */
231 * _fetch_next_ocp_if - return the next OCP interface in a list
232 * @p: ptr to a ptr to the list_head inside the ocp_if to return
233 * @i: pointer to the index of the element pointed to by @p in the list
235 * Return a pointer to the struct omap_hwmod_ocp_if record
236 * containing the struct list_head pointed to by @p, and increment
237 * @p such that a future call to this routine will return the next
240 static struct omap_hwmod_ocp_if
*_fetch_next_ocp_if(struct list_head
**p
,
243 struct omap_hwmod_ocp_if
*oi
;
245 oi
= list_entry(*p
, struct omap_hwmod_link
, node
)->ocp_if
;
254 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
255 * @oh: struct omap_hwmod *
257 * Load the current value of the hwmod OCP_SYSCONFIG register into the
258 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
259 * OCP_SYSCONFIG register or 0 upon success.
261 static int _update_sysc_cache(struct omap_hwmod
*oh
)
263 if (!oh
->class->sysc
) {
264 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
268 /* XXX ensure module interface clock is up */
270 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
272 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
273 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
279 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
280 * @v: OCP_SYSCONFIG value to write
281 * @oh: struct omap_hwmod *
283 * Write @v into the module class' OCP_SYSCONFIG register, if it has
284 * one. No return value.
286 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
288 if (!oh
->class->sysc
) {
289 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
293 /* XXX ensure module interface clock is up */
295 /* Module might have lost context, always update cache and register */
297 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
301 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
302 * @oh: struct omap_hwmod *
303 * @standbymode: MIDLEMODE field bits
304 * @v: pointer to register contents to modify
306 * Update the master standby mode bits in @v to be @standbymode for
307 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
308 * upon error or 0 upon success.
310 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
316 if (!oh
->class->sysc
||
317 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
320 if (!oh
->class->sysc
->sysc_fields
) {
321 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
325 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
326 mstandby_mask
= (0x3 << mstandby_shift
);
328 *v
&= ~mstandby_mask
;
329 *v
|= __ffs(standbymode
) << mstandby_shift
;
335 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
336 * @oh: struct omap_hwmod *
337 * @idlemode: SIDLEMODE field bits
338 * @v: pointer to register contents to modify
340 * Update the slave idle mode bits in @v to be @idlemode for the @oh
341 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
344 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
349 if (!oh
->class->sysc
||
350 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
353 if (!oh
->class->sysc
->sysc_fields
) {
354 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
358 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
359 sidle_mask
= (0x3 << sidle_shift
);
362 *v
|= __ffs(idlemode
) << sidle_shift
;
368 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
369 * @oh: struct omap_hwmod *
370 * @clockact: CLOCKACTIVITY field bits
371 * @v: pointer to register contents to modify
373 * Update the clockactivity mode bits in @v to be @clockact for the
374 * @oh hwmod. Used for additional powersaving on some modules. Does
375 * not write to the hardware. Returns -EINVAL upon error or 0 upon
378 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
383 if (!oh
->class->sysc
||
384 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
387 if (!oh
->class->sysc
->sysc_fields
) {
388 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
392 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
393 clkact_mask
= (0x3 << clkact_shift
);
396 *v
|= clockact
<< clkact_shift
;
402 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
403 * @oh: struct omap_hwmod *
404 * @v: pointer to register contents to modify
406 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
407 * error or 0 upon success.
409 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
413 if (!oh
->class->sysc
||
414 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
417 if (!oh
->class->sysc
->sysc_fields
) {
418 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
422 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
430 * _wait_softreset_complete - wait for an OCP softreset to complete
431 * @oh: struct omap_hwmod * to wait on
433 * Wait until the IP block represented by @oh reports that its OCP
434 * softreset is complete. This can be triggered by software (see
435 * _ocp_softreset()) or by hardware upon returning from off-mode (one
436 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
437 * microseconds. Returns the number of microseconds waited.
439 static int _wait_softreset_complete(struct omap_hwmod
*oh
)
441 struct omap_hwmod_class_sysconfig
*sysc
;
445 sysc
= oh
->class->sysc
;
447 if (sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
448 omap_test_timeout((omap_hwmod_read(oh
, sysc
->syss_offs
)
449 & SYSS_RESETDONE_MASK
),
450 MAX_MODULE_SOFTRESET_WAIT
, c
);
451 else if (sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
) {
452 softrst_mask
= (0x1 << sysc
->sysc_fields
->srst_shift
);
453 omap_test_timeout(!(omap_hwmod_read(oh
, sysc
->sysc_offs
)
455 MAX_MODULE_SOFTRESET_WAIT
, c
);
462 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
463 * @oh: struct omap_hwmod *
465 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
466 * of some modules. When the DMA must perform read/write accesses, the
467 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
468 * for power management, software must set the DMADISABLE bit back to 1.
470 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
471 * error or 0 upon success.
473 static int _set_dmadisable(struct omap_hwmod
*oh
)
478 if (!oh
->class->sysc
||
479 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_DMADISABLE
))
482 if (!oh
->class->sysc
->sysc_fields
) {
483 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
487 /* clocks must be on for this operation */
488 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
489 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh
->name
);
493 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh
->name
);
497 (0x1 << oh
->class->sysc
->sysc_fields
->dmadisable_shift
);
498 v
|= dmadisable_mask
;
499 _write_sysconfig(v
, oh
);
505 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
506 * @oh: struct omap_hwmod *
507 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
508 * @v: pointer to register contents to modify
510 * Update the module autoidle bit in @v to be @autoidle for the @oh
511 * hwmod. The autoidle bit controls whether the module can gate
512 * internal clocks automatically when it isn't doing anything; the
513 * exact function of this bit varies on a per-module basis. This
514 * function does not write to the hardware. Returns -EINVAL upon
515 * error or 0 upon success.
517 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
523 if (!oh
->class->sysc
||
524 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
527 if (!oh
->class->sysc
->sysc_fields
) {
528 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
532 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
533 autoidle_mask
= (0x1 << autoidle_shift
);
535 *v
&= ~autoidle_mask
;
536 *v
|= autoidle
<< autoidle_shift
;
542 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
543 * @oh: struct omap_hwmod *
544 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
546 * Set or clear the I/O pad wakeup flag in the mux entries for the
547 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
548 * in memory. If the hwmod is currently idled, and the new idle
549 * values don't match the previous ones, this function will also
550 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
551 * currently idled, this function won't touch the hardware: the new
552 * mux settings are written to the SCM PADCTRL registers when the
553 * hwmod is idled. No return value.
555 static void _set_idle_ioring_wakeup(struct omap_hwmod
*oh
, bool set_wake
)
557 struct omap_device_pad
*pad
;
562 if (!oh
->mux
|| !oh
->mux
->enabled
)
565 for (j
= 0; j
< oh
->mux
->nr_pads_dynamic
; j
++) {
566 pad
= oh
->mux
->pads_dynamic
[j
];
568 if (!(pad
->flags
& OMAP_DEVICE_PAD_WAKEUP
))
571 prev_idle
= pad
->idle
;
574 pad
->idle
|= OMAP_WAKEUP_EN
;
576 pad
->idle
&= ~OMAP_WAKEUP_EN
;
578 if (prev_idle
!= pad
->idle
)
582 if (change
&& oh
->_state
== _HWMOD_STATE_IDLE
)
583 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
587 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
588 * @oh: struct omap_hwmod *
590 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
591 * upon error or 0 upon success.
593 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
595 if (!oh
->class->sysc
||
596 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
597 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
598 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
601 if (!oh
->class->sysc
->sysc_fields
) {
602 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
606 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
607 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
609 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
610 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
611 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
612 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
614 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
620 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
621 * @oh: struct omap_hwmod *
623 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
624 * upon error or 0 upon success.
626 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
628 if (!oh
->class->sysc
||
629 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
630 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
631 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
634 if (!oh
->class->sysc
->sysc_fields
) {
635 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
639 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
640 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
642 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
643 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
644 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
645 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART
, v
);
647 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
652 static struct clockdomain
*_get_clkdm(struct omap_hwmod
*oh
)
654 struct clk_hw_omap
*clk
;
658 } else if (oh
->_clk
) {
659 clk
= to_clk_hw_omap(__clk_get_hw(oh
->_clk
));
666 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
667 * @oh: struct omap_hwmod *
669 * Prevent the hardware module @oh from entering idle while the
670 * hardare module initiator @init_oh is active. Useful when a module
671 * will be accessed by a particular initiator (e.g., if a module will
672 * be accessed by the IVA, there should be a sleepdep between the IVA
673 * initiator and the module). Only applies to modules in smart-idle
674 * mode. If the clockdomain is marked as not needing autodeps, return
675 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
676 * passes along clkdm_add_sleepdep() value upon success.
678 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
680 struct clockdomain
*clkdm
, *init_clkdm
;
682 clkdm
= _get_clkdm(oh
);
683 init_clkdm
= _get_clkdm(init_oh
);
685 if (!clkdm
|| !init_clkdm
)
688 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
691 return clkdm_add_sleepdep(clkdm
, init_clkdm
);
695 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
696 * @oh: struct omap_hwmod *
698 * Allow the hardware module @oh to enter idle while the hardare
699 * module initiator @init_oh is active. Useful when a module will not
700 * be accessed by a particular initiator (e.g., if a module will not
701 * be accessed by the IVA, there should be no sleepdep between the IVA
702 * initiator and the module). Only applies to modules in smart-idle
703 * mode. If the clockdomain is marked as not needing autodeps, return
704 * 0 without doing anything. Returns -EINVAL upon error or passes
705 * along clkdm_del_sleepdep() value upon success.
707 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
709 struct clockdomain
*clkdm
, *init_clkdm
;
711 clkdm
= _get_clkdm(oh
);
712 init_clkdm
= _get_clkdm(init_oh
);
714 if (!clkdm
|| !init_clkdm
)
717 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
720 return clkdm_del_sleepdep(clkdm
, init_clkdm
);
724 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
725 * @oh: struct omap_hwmod *
727 * Called from _init_clocks(). Populates the @oh _clk (main
728 * functional clock pointer) if a main_clk is present. Returns 0 on
729 * success or -EINVAL on error.
731 static int _init_main_clk(struct omap_hwmod
*oh
)
738 oh
->_clk
= clk_get(NULL
, oh
->main_clk
);
739 if (IS_ERR(oh
->_clk
)) {
740 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
741 oh
->name
, oh
->main_clk
);
745 * HACK: This needs a re-visit once clk_prepare() is implemented
746 * to do something meaningful. Today its just a no-op.
747 * If clk_prepare() is used at some point to do things like
748 * voltage scaling etc, then this would have to be moved to
749 * some point where subsystems like i2c and pmic become
752 clk_prepare(oh
->_clk
);
755 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
756 oh
->name
, oh
->main_clk
);
762 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
763 * @oh: struct omap_hwmod *
765 * Called from _init_clocks(). Populates the @oh OCP slave interface
766 * clock pointers. Returns 0 on success or -EINVAL on error.
768 static int _init_interface_clks(struct omap_hwmod
*oh
)
770 struct omap_hwmod_ocp_if
*os
;
776 p
= oh
->slave_ports
.next
;
778 while (i
< oh
->slaves_cnt
) {
779 os
= _fetch_next_ocp_if(&p
, &i
);
783 c
= clk_get(NULL
, os
->clk
);
785 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
791 * HACK: This needs a re-visit once clk_prepare() is implemented
792 * to do something meaningful. Today its just a no-op.
793 * If clk_prepare() is used at some point to do things like
794 * voltage scaling etc, then this would have to be moved to
795 * some point where subsystems like i2c and pmic become
798 clk_prepare(os
->_clk
);
805 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
806 * @oh: struct omap_hwmod *
808 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
809 * clock pointers. Returns 0 on success or -EINVAL on error.
811 static int _init_opt_clks(struct omap_hwmod
*oh
)
813 struct omap_hwmod_opt_clk
*oc
;
818 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
819 c
= clk_get(NULL
, oc
->clk
);
821 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
827 * HACK: This needs a re-visit once clk_prepare() is implemented
828 * to do something meaningful. Today its just a no-op.
829 * If clk_prepare() is used at some point to do things like
830 * voltage scaling etc, then this would have to be moved to
831 * some point where subsystems like i2c and pmic become
834 clk_prepare(oc
->_clk
);
841 * _enable_clocks - enable hwmod main clock and interface clocks
842 * @oh: struct omap_hwmod *
844 * Enables all clocks necessary for register reads and writes to succeed
845 * on the hwmod @oh. Returns 0.
847 static int _enable_clocks(struct omap_hwmod
*oh
)
849 struct omap_hwmod_ocp_if
*os
;
853 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
856 clk_enable(oh
->_clk
);
858 p
= oh
->slave_ports
.next
;
860 while (i
< oh
->slaves_cnt
) {
861 os
= _fetch_next_ocp_if(&p
, &i
);
863 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
864 clk_enable(os
->_clk
);
867 /* The opt clocks are controlled by the device driver. */
873 * _disable_clocks - disable hwmod main clock and interface clocks
874 * @oh: struct omap_hwmod *
876 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
878 static int _disable_clocks(struct omap_hwmod
*oh
)
880 struct omap_hwmod_ocp_if
*os
;
884 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
887 clk_disable(oh
->_clk
);
889 p
= oh
->slave_ports
.next
;
891 while (i
< oh
->slaves_cnt
) {
892 os
= _fetch_next_ocp_if(&p
, &i
);
894 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
895 clk_disable(os
->_clk
);
898 /* The opt clocks are controlled by the device driver. */
903 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
905 struct omap_hwmod_opt_clk
*oc
;
908 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
910 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
912 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
913 __clk_get_name(oc
->_clk
));
914 clk_enable(oc
->_clk
);
918 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
920 struct omap_hwmod_opt_clk
*oc
;
923 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
925 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
927 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
928 __clk_get_name(oc
->_clk
));
929 clk_disable(oc
->_clk
);
934 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
935 * @oh: struct omap_hwmod *
937 * Enables the PRCM module mode related to the hwmod @oh.
940 static void _omap4_enable_module(struct omap_hwmod
*oh
)
942 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
945 pr_debug("omap_hwmod: %s: %s: %d\n",
946 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
948 omap4_cminst_module_enable(oh
->prcm
.omap4
.modulemode
,
949 oh
->clkdm
->prcm_partition
,
951 oh
->clkdm
->clkdm_offs
,
952 oh
->prcm
.omap4
.clkctrl_offs
);
956 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
957 * @oh: struct omap_hwmod *
959 * Enables the PRCM module mode related to the hwmod @oh.
962 static void _am33xx_enable_module(struct omap_hwmod
*oh
)
964 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
967 pr_debug("omap_hwmod: %s: %s: %d\n",
968 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
970 am33xx_cm_module_enable(oh
->prcm
.omap4
.modulemode
, oh
->clkdm
->cm_inst
,
971 oh
->clkdm
->clkdm_offs
,
972 oh
->prcm
.omap4
.clkctrl_offs
);
976 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
977 * @oh: struct omap_hwmod *
979 * Wait for a module @oh to enter slave idle. Returns 0 if the module
980 * does not have an IDLEST bit or if the module successfully enters
981 * slave idle; otherwise, pass along the return value of the
982 * appropriate *_cm*_wait_module_idle() function.
984 static int _omap4_wait_target_disable(struct omap_hwmod
*oh
)
989 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| !oh
->clkdm
)
992 if (oh
->flags
& HWMOD_NO_IDLEST
)
995 return omap4_cminst_wait_module_idle(oh
->clkdm
->prcm_partition
,
997 oh
->clkdm
->clkdm_offs
,
998 oh
->prcm
.omap4
.clkctrl_offs
);
1002 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
1003 * @oh: struct omap_hwmod *
1005 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1006 * does not have an IDLEST bit or if the module successfully enters
1007 * slave idle; otherwise, pass along the return value of the
1008 * appropriate *_cm*_wait_module_idle() function.
1010 static int _am33xx_wait_target_disable(struct omap_hwmod
*oh
)
1015 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1018 if (oh
->flags
& HWMOD_NO_IDLEST
)
1021 return am33xx_cm_wait_module_idle(oh
->clkdm
->cm_inst
,
1022 oh
->clkdm
->clkdm_offs
,
1023 oh
->prcm
.omap4
.clkctrl_offs
);
1027 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1028 * @oh: struct omap_hwmod *oh
1030 * Count and return the number of MPU IRQs associated with the hwmod
1031 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1034 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
1036 struct omap_hwmod_irq_info
*ohii
;
1039 if (!oh
|| !oh
->mpu_irqs
)
1043 ohii
= &oh
->mpu_irqs
[i
++];
1044 } while (ohii
->irq
!= -1);
1050 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1051 * @oh: struct omap_hwmod *oh
1053 * Count and return the number of SDMA request lines associated with
1054 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1057 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
1059 struct omap_hwmod_dma_info
*ohdi
;
1062 if (!oh
|| !oh
->sdma_reqs
)
1066 ohdi
= &oh
->sdma_reqs
[i
++];
1067 } while (ohdi
->dma_req
!= -1);
1073 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1074 * @oh: struct omap_hwmod *oh
1076 * Count and return the number of address space ranges associated with
1077 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1080 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
1082 struct omap_hwmod_addr_space
*mem
;
1085 if (!os
|| !os
->addr
)
1089 mem
= &os
->addr
[i
++];
1090 } while (mem
->pa_start
!= mem
->pa_end
);
1096 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1097 * @oh: struct omap_hwmod * to operate on
1098 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1099 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1101 * Retrieve a MPU hardware IRQ line number named by @name associated
1102 * with the IP block pointed to by @oh. The IRQ number will be filled
1103 * into the address pointed to by @dma. When @name is non-null, the
1104 * IRQ line number associated with the named entry will be returned.
1105 * If @name is null, the first matching entry will be returned. Data
1106 * order is not meaningful in hwmod data, so callers are strongly
1107 * encouraged to use a non-null @name whenever possible to avoid
1108 * unpredictable effects if hwmod data is later added that causes data
1109 * ordering to change. Returns 0 upon success or a negative error
1112 static int _get_mpu_irq_by_name(struct omap_hwmod
*oh
, const char *name
,
1122 while (oh
->mpu_irqs
[i
].irq
!= -1) {
1123 if (name
== oh
->mpu_irqs
[i
].name
||
1124 !strcmp(name
, oh
->mpu_irqs
[i
].name
)) {
1134 *irq
= oh
->mpu_irqs
[i
].irq
;
1140 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1141 * @oh: struct omap_hwmod * to operate on
1142 * @name: pointer to the name of the SDMA request line to fetch (optional)
1143 * @dma: pointer to an unsigned int to store the request line ID to
1145 * Retrieve an SDMA request line ID named by @name on the IP block
1146 * pointed to by @oh. The ID will be filled into the address pointed
1147 * to by @dma. When @name is non-null, the request line ID associated
1148 * with the named entry will be returned. If @name is null, the first
1149 * matching entry will be returned. Data order is not meaningful in
1150 * hwmod data, so callers are strongly encouraged to use a non-null
1151 * @name whenever possible to avoid unpredictable effects if hwmod
1152 * data is later added that causes data ordering to change. Returns 0
1153 * upon success or a negative error code upon error.
1155 static int _get_sdma_req_by_name(struct omap_hwmod
*oh
, const char *name
,
1165 while (oh
->sdma_reqs
[i
].dma_req
!= -1) {
1166 if (name
== oh
->sdma_reqs
[i
].name
||
1167 !strcmp(name
, oh
->sdma_reqs
[i
].name
)) {
1177 *dma
= oh
->sdma_reqs
[i
].dma_req
;
1183 * _get_addr_space_by_name - fetch address space start & end by name
1184 * @oh: struct omap_hwmod * to operate on
1185 * @name: pointer to the name of the address space to fetch (optional)
1186 * @pa_start: pointer to a u32 to store the starting address to
1187 * @pa_end: pointer to a u32 to store the ending address to
1189 * Retrieve address space start and end addresses for the IP block
1190 * pointed to by @oh. The data will be filled into the addresses
1191 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1192 * address space data associated with the named entry will be
1193 * returned. If @name is null, the first matching entry will be
1194 * returned. Data order is not meaningful in hwmod data, so callers
1195 * are strongly encouraged to use a non-null @name whenever possible
1196 * to avoid unpredictable effects if hwmod data is later added that
1197 * causes data ordering to change. Returns 0 upon success or a
1198 * negative error code upon error.
1200 static int _get_addr_space_by_name(struct omap_hwmod
*oh
, const char *name
,
1201 u32
*pa_start
, u32
*pa_end
)
1204 struct omap_hwmod_ocp_if
*os
;
1205 struct list_head
*p
= NULL
;
1208 p
= oh
->slave_ports
.next
;
1211 while (i
< oh
->slaves_cnt
) {
1212 os
= _fetch_next_ocp_if(&p
, &i
);
1218 while (os
->addr
[j
].pa_start
!= os
->addr
[j
].pa_end
) {
1219 if (name
== os
->addr
[j
].name
||
1220 !strcmp(name
, os
->addr
[j
].name
)) {
1234 *pa_start
= os
->addr
[j
].pa_start
;
1235 *pa_end
= os
->addr
[j
].pa_end
;
1241 * _save_mpu_port_index - find and save the index to @oh's MPU port
1242 * @oh: struct omap_hwmod *
1244 * Determines the array index of the OCP slave port that the MPU uses
1245 * to address the device, and saves it into the struct omap_hwmod.
1246 * Intended to be called during hwmod registration only. No return
1249 static void __init
_save_mpu_port_index(struct omap_hwmod
*oh
)
1251 struct omap_hwmod_ocp_if
*os
= NULL
;
1252 struct list_head
*p
;
1258 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1260 p
= oh
->slave_ports
.next
;
1262 while (i
< oh
->slaves_cnt
) {
1263 os
= _fetch_next_ocp_if(&p
, &i
);
1264 if (os
->user
& OCP_USER_MPU
) {
1266 oh
->_int_flags
&= ~_HWMOD_NO_MPU_PORT
;
1275 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1276 * @oh: struct omap_hwmod *
1278 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1279 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1280 * communicate with the IP block. This interface need not be directly
1281 * connected to the MPU (and almost certainly is not), but is directly
1282 * connected to the IP block represented by @oh. Returns a pointer
1283 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1284 * error or if there does not appear to be a path from the MPU to this
1287 static struct omap_hwmod_ocp_if
*_find_mpu_rt_port(struct omap_hwmod
*oh
)
1289 if (!oh
|| oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| oh
->slaves_cnt
== 0)
1292 return oh
->_mpu_port
;
1296 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1297 * @oh: struct omap_hwmod *
1299 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1300 * the register target MPU address space; or returns NULL upon error.
1302 static struct omap_hwmod_addr_space
* __init
_find_mpu_rt_addr_space(struct omap_hwmod
*oh
)
1304 struct omap_hwmod_ocp_if
*os
;
1305 struct omap_hwmod_addr_space
*mem
;
1306 int found
= 0, i
= 0;
1308 os
= _find_mpu_rt_port(oh
);
1309 if (!os
|| !os
->addr
)
1313 mem
= &os
->addr
[i
++];
1314 if (mem
->flags
& ADDR_TYPE_RT
)
1316 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
1318 return (found
) ? mem
: NULL
;
1322 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1323 * @oh: struct omap_hwmod *
1325 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1326 * by @oh is set to indicate to the PRCM that the IP block is active.
1327 * Usually this means placing the module into smart-idle mode and
1328 * smart-standby, but if there is a bug in the automatic idle handling
1329 * for the IP block, it may need to be placed into the force-idle or
1330 * no-idle variants of these modes. No return value.
1332 static void _enable_sysc(struct omap_hwmod
*oh
)
1337 struct clockdomain
*clkdm
;
1339 if (!oh
->class->sysc
)
1343 * Wait until reset has completed, this is needed as the IP
1344 * block is reset automatically by hardware in some cases
1345 * (off-mode for example), and the drivers require the
1346 * IP to be ready when they access it
1348 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1349 _enable_optional_clocks(oh
);
1350 _wait_softreset_complete(oh
);
1351 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1352 _disable_optional_clocks(oh
);
1354 v
= oh
->_sysc_cache
;
1355 sf
= oh
->class->sysc
->sysc_flags
;
1357 clkdm
= _get_clkdm(oh
);
1358 if (sf
& SYSC_HAS_SIDLEMODE
) {
1359 if (oh
->flags
& HWMOD_SWSUP_SIDLE
||
1360 oh
->flags
& HWMOD_SWSUP_SIDLE_ACT
) {
1361 idlemode
= HWMOD_IDLEMODE_NO
;
1363 if (sf
& SYSC_HAS_ENAWAKEUP
)
1364 _enable_wakeup(oh
, &v
);
1365 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
1366 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1368 idlemode
= HWMOD_IDLEMODE_SMART
;
1372 * This is special handling for some IPs like
1373 * 32k sync timer. Force them to idle!
1375 clkdm_act
= (clkdm
&& clkdm
->flags
& CLKDM_ACTIVE_WITH_MPU
);
1376 if (clkdm_act
&& !(oh
->class->sysc
->idlemodes
&
1377 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1378 idlemode
= HWMOD_IDLEMODE_FORCE
;
1380 _set_slave_idlemode(oh
, idlemode
, &v
);
1383 if (sf
& SYSC_HAS_MIDLEMODE
) {
1384 if (oh
->flags
& HWMOD_FORCE_MSTANDBY
) {
1385 idlemode
= HWMOD_IDLEMODE_FORCE
;
1386 } else if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1387 idlemode
= HWMOD_IDLEMODE_NO
;
1389 if (sf
& SYSC_HAS_ENAWAKEUP
)
1390 _enable_wakeup(oh
, &v
);
1391 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1392 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1394 idlemode
= HWMOD_IDLEMODE_SMART
;
1396 _set_master_standbymode(oh
, idlemode
, &v
);
1400 * XXX The clock framework should handle this, by
1401 * calling into this code. But this must wait until the
1402 * clock structures are tagged with omap_hwmod entries
1404 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
1405 (sf
& SYSC_HAS_CLOCKACTIVITY
))
1406 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
1408 /* If the cached value is the same as the new value, skip the write */
1409 if (oh
->_sysc_cache
!= v
)
1410 _write_sysconfig(v
, oh
);
1413 * Set the autoidle bit only after setting the smartidle bit
1414 * Setting this will not have any impact on the other modules.
1416 if (sf
& SYSC_HAS_AUTOIDLE
) {
1417 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
1419 _set_module_autoidle(oh
, idlemode
, &v
);
1420 _write_sysconfig(v
, oh
);
1425 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1426 * @oh: struct omap_hwmod *
1428 * If module is marked as SWSUP_SIDLE, force the module into slave
1429 * idle; otherwise, configure it for smart-idle. If module is marked
1430 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1431 * configure it for smart-standby. No return value.
1433 static void _idle_sysc(struct omap_hwmod
*oh
)
1438 if (!oh
->class->sysc
)
1441 v
= oh
->_sysc_cache
;
1442 sf
= oh
->class->sysc
->sysc_flags
;
1444 if (sf
& SYSC_HAS_SIDLEMODE
) {
1445 if (oh
->flags
& HWMOD_SWSUP_SIDLE
) {
1446 idlemode
= HWMOD_IDLEMODE_FORCE
;
1448 if (sf
& SYSC_HAS_ENAWAKEUP
)
1449 _enable_wakeup(oh
, &v
);
1450 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
1451 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1453 idlemode
= HWMOD_IDLEMODE_SMART
;
1455 _set_slave_idlemode(oh
, idlemode
, &v
);
1458 if (sf
& SYSC_HAS_MIDLEMODE
) {
1459 if ((oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ||
1460 (oh
->flags
& HWMOD_FORCE_MSTANDBY
)) {
1461 idlemode
= HWMOD_IDLEMODE_FORCE
;
1463 if (sf
& SYSC_HAS_ENAWAKEUP
)
1464 _enable_wakeup(oh
, &v
);
1465 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1466 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1468 idlemode
= HWMOD_IDLEMODE_SMART
;
1470 _set_master_standbymode(oh
, idlemode
, &v
);
1473 _write_sysconfig(v
, oh
);
1477 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1478 * @oh: struct omap_hwmod *
1480 * Force the module into slave idle and master suspend. No return
1483 static void _shutdown_sysc(struct omap_hwmod
*oh
)
1488 if (!oh
->class->sysc
)
1491 v
= oh
->_sysc_cache
;
1492 sf
= oh
->class->sysc
->sysc_flags
;
1494 if (sf
& SYSC_HAS_SIDLEMODE
)
1495 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1497 if (sf
& SYSC_HAS_MIDLEMODE
)
1498 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1500 if (sf
& SYSC_HAS_AUTOIDLE
)
1501 _set_module_autoidle(oh
, 1, &v
);
1503 _write_sysconfig(v
, oh
);
1507 * _lookup - find an omap_hwmod by name
1508 * @name: find an omap_hwmod by name
1510 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1512 static struct omap_hwmod
*_lookup(const char *name
)
1514 struct omap_hwmod
*oh
, *temp_oh
;
1518 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1519 if (!strcmp(name
, temp_oh
->name
)) {
1529 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1530 * @oh: struct omap_hwmod *
1532 * Convert a clockdomain name stored in a struct omap_hwmod into a
1533 * clockdomain pointer, and save it into the struct omap_hwmod.
1534 * Return -EINVAL if the clkdm_name lookup failed.
1536 static int _init_clkdm(struct omap_hwmod
*oh
)
1538 if (!oh
->clkdm_name
) {
1539 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh
->name
);
1543 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1545 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1546 oh
->name
, oh
->clkdm_name
);
1550 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1551 oh
->name
, oh
->clkdm_name
);
1557 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1558 * well the clockdomain.
1559 * @oh: struct omap_hwmod *
1560 * @data: not used; pass NULL
1562 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1563 * Resolves all clock names embedded in the hwmod. Returns 0 on
1564 * success, or a negative error code on failure.
1566 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1570 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1573 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1575 if (soc_ops
.init_clkdm
)
1576 ret
|= soc_ops
.init_clkdm(oh
);
1578 ret
|= _init_main_clk(oh
);
1579 ret
|= _init_interface_clks(oh
);
1580 ret
|= _init_opt_clks(oh
);
1583 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1585 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1591 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1592 * @oh: struct omap_hwmod *
1593 * @name: name of the reset line in the context of this hwmod
1594 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1596 * Return the bit position of the reset line that match the
1597 * input name. Return -ENOENT if not found.
1599 static int _lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1600 struct omap_hwmod_rst_info
*ohri
)
1604 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1605 const char *rst_line
= oh
->rst_lines
[i
].name
;
1606 if (!strcmp(rst_line
, name
)) {
1607 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1608 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1609 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1610 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1621 * _assert_hardreset - assert the HW reset line of submodules
1622 * contained in the hwmod module.
1623 * @oh: struct omap_hwmod *
1624 * @name: name of the reset line to lookup and assert
1626 * Some IP like dsp, ipu or iva contain processor that require an HW
1627 * reset line to be assert / deassert in order to enable fully the IP.
1628 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1629 * asserting the hardreset line on the currently-booted SoC, or passes
1630 * along the return value from _lookup_hardreset() or the SoC's
1631 * assert_hardreset code.
1633 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1635 struct omap_hwmod_rst_info ohri
;
1641 if (!soc_ops
.assert_hardreset
)
1644 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1648 ret
= soc_ops
.assert_hardreset(oh
, &ohri
);
1654 * _deassert_hardreset - deassert the HW reset line of submodules contained
1655 * in the hwmod module.
1656 * @oh: struct omap_hwmod *
1657 * @name: name of the reset line to look up and deassert
1659 * Some IP like dsp, ipu or iva contain processor that require an HW
1660 * reset line to be assert / deassert in order to enable fully the IP.
1661 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1662 * deasserting the hardreset line on the currently-booted SoC, or passes
1663 * along the return value from _lookup_hardreset() or the SoC's
1664 * deassert_hardreset code.
1666 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1668 struct omap_hwmod_rst_info ohri
;
1675 if (!soc_ops
.deassert_hardreset
)
1678 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1684 * A clockdomain must be in SW_SUP otherwise reset
1685 * might not be completed. The clockdomain can be set
1686 * in HW_AUTO only when the module become ready.
1688 hwsup
= clkdm_in_hwsup(oh
->clkdm
);
1689 ret
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
1691 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1692 oh
->name
, oh
->clkdm
->name
, ret
);
1698 if (soc_ops
.enable_module
)
1699 soc_ops
.enable_module(oh
);
1701 ret
= soc_ops
.deassert_hardreset(oh
, &ohri
);
1703 if (soc_ops
.disable_module
)
1704 soc_ops
.disable_module(oh
);
1705 _disable_clocks(oh
);
1708 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1712 * Set the clockdomain to HW_AUTO, assuming that the
1713 * previous state was HW_AUTO.
1715 if (oh
->clkdm
&& hwsup
)
1716 clkdm_allow_idle(oh
->clkdm
);
1719 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1726 * _read_hardreset - read the HW reset line state of submodules
1727 * contained in the hwmod module
1728 * @oh: struct omap_hwmod *
1729 * @name: name of the reset line to look up and read
1731 * Return the state of the reset line. Returns -EINVAL if @oh is
1732 * null, -ENOSYS if we have no way of reading the hardreset line
1733 * status on the currently-booted SoC, or passes along the return
1734 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1737 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1739 struct omap_hwmod_rst_info ohri
;
1745 if (!soc_ops
.is_hardreset_asserted
)
1748 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1752 return soc_ops
.is_hardreset_asserted(oh
, &ohri
);
1756 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1757 * @oh: struct omap_hwmod *
1759 * If all hardreset lines associated with @oh are asserted, then return true.
1760 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1761 * associated with @oh are asserted, then return false.
1762 * This function is used to avoid executing some parts of the IP block
1763 * enable/disable sequence if its hardreset line is set.
1765 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1769 if (oh
->rst_lines_cnt
== 0)
1772 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1773 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1776 if (oh
->rst_lines_cnt
== rst_cnt
)
1783 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1785 * @oh: struct omap_hwmod *
1787 * If any hardreset lines associated with @oh are asserted, then
1788 * return true. Otherwise, if no hardreset lines associated with @oh
1789 * are asserted, or if @oh has no hardreset lines, then return false.
1790 * This function is used to avoid executing some parts of the IP block
1791 * enable/disable sequence if any hardreset line is set.
1793 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1798 for (i
= 0; i
< oh
->rst_lines_cnt
&& rst_cnt
== 0; i
++)
1799 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1802 return (rst_cnt
) ? true : false;
1806 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1807 * @oh: struct omap_hwmod *
1809 * Disable the PRCM module mode related to the hwmod @oh.
1810 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1812 static int _omap4_disable_module(struct omap_hwmod
*oh
)
1816 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1820 * Since integration code might still be doing something, only
1821 * disable if all lines are under hardreset.
1823 if (_are_any_hardreset_lines_asserted(oh
))
1826 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1828 omap4_cminst_module_disable(oh
->clkdm
->prcm_partition
,
1830 oh
->clkdm
->clkdm_offs
,
1831 oh
->prcm
.omap4
.clkctrl_offs
);
1833 v
= _omap4_wait_target_disable(oh
);
1835 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1842 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1843 * @oh: struct omap_hwmod *
1845 * Disable the PRCM module mode related to the hwmod @oh.
1846 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1848 static int _am33xx_disable_module(struct omap_hwmod
*oh
)
1852 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1855 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1857 if (_are_any_hardreset_lines_asserted(oh
))
1860 am33xx_cm_module_disable(oh
->clkdm
->cm_inst
, oh
->clkdm
->clkdm_offs
,
1861 oh
->prcm
.omap4
.clkctrl_offs
);
1863 v
= _am33xx_wait_target_disable(oh
);
1865 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1872 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1873 * @oh: struct omap_hwmod *
1875 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1876 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1877 * reset this way, -EINVAL if the hwmod is in the wrong state,
1878 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1880 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1881 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1882 * use the SYSCONFIG softreset bit to provide the status.
1884 * Note that some IP like McBSP do have reset control but don't have
1887 static int _ocp_softreset(struct omap_hwmod
*oh
)
1893 if (!oh
->class->sysc
||
1894 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1897 /* clocks must be on for this operation */
1898 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1899 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1904 /* For some modules, all optionnal clocks need to be enabled as well */
1905 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1906 _enable_optional_clocks(oh
);
1908 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1910 v
= oh
->_sysc_cache
;
1911 ret
= _set_softreset(oh
, &v
);
1914 _write_sysconfig(v
, oh
);
1916 if (oh
->class->sysc
->srst_udelay
)
1917 udelay(oh
->class->sysc
->srst_udelay
);
1919 c
= _wait_softreset_complete(oh
);
1920 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1921 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1922 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1924 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1927 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1928 * _wait_target_ready() or _reset()
1931 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1934 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1935 _disable_optional_clocks(oh
);
1941 * _reset - reset an omap_hwmod
1942 * @oh: struct omap_hwmod *
1944 * Resets an omap_hwmod @oh. If the module has a custom reset
1945 * function pointer defined, then call it to reset the IP block, and
1946 * pass along its return value to the caller. Otherwise, if the IP
1947 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1948 * associated with it, call a function to reset the IP block via that
1949 * method, and pass along the return value to the caller. Finally, if
1950 * the IP block has some hardreset lines associated with it, assert
1951 * all of those, but do _not_ deassert them. (This is because driver
1952 * authors have expressed an apparent requirement to control the
1953 * deassertion of the hardreset lines themselves.)
1955 * The default software reset mechanism for most OMAP IP blocks is
1956 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1957 * hwmods cannot be reset via this method. Some are not targets and
1958 * therefore have no OCP header registers to access. Others (like the
1959 * IVA) have idiosyncratic reset sequences. So for these relatively
1960 * rare cases, custom reset code can be supplied in the struct
1961 * omap_hwmod_class .reset function pointer.
1963 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1964 * does not prevent idling of the system. This is necessary for cases
1965 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1966 * kernel without disabling dma.
1968 * Passes along the return value from either _ocp_softreset() or the
1969 * custom reset function - these must return -EINVAL if the hwmod
1970 * cannot be reset this way or if the hwmod is in the wrong state,
1971 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1973 static int _reset(struct omap_hwmod
*oh
)
1977 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1979 if (oh
->class->reset
) {
1980 r
= oh
->class->reset(oh
);
1982 if (oh
->rst_lines_cnt
> 0) {
1983 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1984 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
1987 r
= _ocp_softreset(oh
);
1993 _set_dmadisable(oh
);
1996 * OCP_SYSCONFIG bits need to be reprogrammed after a
1997 * softreset. The _enable() function should be split to avoid
1998 * the rewrite of the OCP_SYSCONFIG register.
2000 if (oh
->class->sysc
) {
2001 _update_sysc_cache(oh
);
2009 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
2011 * Call the appropriate PRM function to clear any logged I/O chain
2012 * wakeups and to reconfigure the chain. This apparently needs to be
2013 * done upon every mux change. Since hwmods can be concurrently
2014 * enabled and idled, hold a spinlock around the I/O chain
2015 * reconfiguration sequence. No return value.
2017 * XXX When the PRM code is moved to drivers, this function can be removed,
2018 * as the PRM infrastructure should abstract this.
2020 static void _reconfigure_io_chain(void)
2022 unsigned long flags
;
2024 spin_lock_irqsave(&io_chain_lock
, flags
);
2026 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
2027 omap3xxx_prm_reconfigure_io_chain();
2028 else if (cpu_is_omap44xx())
2029 omap44xx_prm_reconfigure_io_chain();
2031 spin_unlock_irqrestore(&io_chain_lock
, flags
);
2035 * _omap4_update_context_lost - increment hwmod context loss counter if
2036 * hwmod context was lost, and clear hardware context loss reg
2037 * @oh: hwmod to check for context loss
2039 * If the PRCM indicates that the hwmod @oh lost context, increment
2040 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2041 * bits. No return value.
2043 static void _omap4_update_context_lost(struct omap_hwmod
*oh
)
2045 if (oh
->prcm
.omap4
.flags
& HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT
)
2048 if (!prm_was_any_context_lost_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2049 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2050 oh
->prcm
.omap4
.context_offs
))
2053 oh
->prcm
.omap4
.context_lost_counter
++;
2054 prm_clear_context_loss_flags_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2055 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2056 oh
->prcm
.omap4
.context_offs
);
2060 * _omap4_get_context_lost - get context loss counter for a hwmod
2061 * @oh: hwmod to get context loss counter for
2063 * Returns the in-memory context loss counter for a hwmod.
2065 static int _omap4_get_context_lost(struct omap_hwmod
*oh
)
2067 return oh
->prcm
.omap4
.context_lost_counter
;
2071 * _enable_preprogram - Pre-program an IP block during the _enable() process
2072 * @oh: struct omap_hwmod *
2074 * Some IP blocks (such as AESS) require some additional programming
2075 * after enable before they can enter idle. If a function pointer to
2076 * do so is present in the hwmod data, then call it and pass along the
2077 * return value; otherwise, return 0.
2079 static int _enable_preprogram(struct omap_hwmod
*oh
)
2081 if (!oh
->class->enable_preprogram
)
2084 return oh
->class->enable_preprogram(oh
);
2088 * _enable - enable an omap_hwmod
2089 * @oh: struct omap_hwmod *
2091 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2092 * register target. Returns -EINVAL if the hwmod is in the wrong
2093 * state or passes along the return value of _wait_target_ready().
2095 static int _enable(struct omap_hwmod
*oh
)
2100 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
2103 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2104 * state at init. Now that someone is really trying to enable
2105 * them, just ensure that the hwmod mux is set.
2107 if (oh
->_int_flags
& _HWMOD_SKIP_ENABLE
) {
2109 * If the caller has mux data populated, do the mux'ing
2110 * which wouldn't have been done as part of the _enable()
2111 * done during setup.
2114 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2116 oh
->_int_flags
&= ~_HWMOD_SKIP_ENABLE
;
2120 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
2121 oh
->_state
!= _HWMOD_STATE_IDLE
&&
2122 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
2123 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2129 * If an IP block contains HW reset lines and all of them are
2130 * asserted, we let integration code associated with that
2131 * block handle the enable. We've received very little
2132 * information on what those driver authors need, and until
2133 * detailed information is provided and the driver code is
2134 * posted to the public lists, this is probably the best we
2137 if (_are_all_hardreset_lines_asserted(oh
))
2140 /* Mux pins for device runtime if populated */
2141 if (oh
->mux
&& (!oh
->mux
->enabled
||
2142 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
2143 oh
->mux
->pads_dynamic
))) {
2144 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2145 _reconfigure_io_chain();
2148 _add_initiator_dep(oh
, mpu_oh
);
2152 * A clockdomain must be in SW_SUP before enabling
2153 * completely the module. The clockdomain can be set
2154 * in HW_AUTO only when the module become ready.
2156 hwsup
= clkdm_in_hwsup(oh
->clkdm
) &&
2157 !clkdm_missing_idle_reporting(oh
->clkdm
);
2158 r
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
2160 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2161 oh
->name
, oh
->clkdm
->name
, r
);
2167 if (soc_ops
.enable_module
)
2168 soc_ops
.enable_module(oh
);
2169 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2170 cpu_idle_poll_ctrl(true);
2172 if (soc_ops
.update_context_lost
)
2173 soc_ops
.update_context_lost(oh
);
2175 r
= (soc_ops
.wait_target_ready
) ? soc_ops
.wait_target_ready(oh
) :
2179 * Set the clockdomain to HW_AUTO only if the target is ready,
2180 * assuming that the previous state was HW_AUTO
2182 if (oh
->clkdm
&& hwsup
)
2183 clkdm_allow_idle(oh
->clkdm
);
2185 oh
->_state
= _HWMOD_STATE_ENABLED
;
2187 /* Access the sysconfig only if the target is ready */
2188 if (oh
->class->sysc
) {
2189 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
2190 _update_sysc_cache(oh
);
2193 r
= _enable_preprogram(oh
);
2195 if (soc_ops
.disable_module
)
2196 soc_ops
.disable_module(oh
);
2197 _disable_clocks(oh
);
2198 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2202 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2209 * _idle - idle an omap_hwmod
2210 * @oh: struct omap_hwmod *
2212 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2213 * no further work. Returns -EINVAL if the hwmod is in the wrong
2214 * state or returns 0.
2216 static int _idle(struct omap_hwmod
*oh
)
2218 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
2220 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2221 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2226 if (_are_all_hardreset_lines_asserted(oh
))
2229 if (oh
->class->sysc
)
2231 _del_initiator_dep(oh
, mpu_oh
);
2233 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2234 cpu_idle_poll_ctrl(false);
2235 if (soc_ops
.disable_module
)
2236 soc_ops
.disable_module(oh
);
2239 * The module must be in idle mode before disabling any parents
2240 * clocks. Otherwise, the parent clock might be disabled before
2241 * the module transition is done, and thus will prevent the
2242 * transition to complete properly.
2244 _disable_clocks(oh
);
2246 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2248 /* Mux pins for device idle if populated */
2249 if (oh
->mux
&& oh
->mux
->pads_dynamic
) {
2250 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
2251 _reconfigure_io_chain();
2254 oh
->_state
= _HWMOD_STATE_IDLE
;
2260 * _shutdown - shutdown an omap_hwmod
2261 * @oh: struct omap_hwmod *
2263 * Shut down an omap_hwmod @oh. This should be called when the driver
2264 * used for the hwmod is removed or unloaded or if the driver is not
2265 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2266 * state or returns 0.
2268 static int _shutdown(struct omap_hwmod
*oh
)
2273 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
2274 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2275 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2280 if (_are_all_hardreset_lines_asserted(oh
))
2283 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
2285 if (oh
->class->pre_shutdown
) {
2286 prev_state
= oh
->_state
;
2287 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2289 ret
= oh
->class->pre_shutdown(oh
);
2291 if (prev_state
== _HWMOD_STATE_IDLE
)
2297 if (oh
->class->sysc
) {
2298 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2303 /* clocks and deps are already disabled in idle */
2304 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
2305 _del_initiator_dep(oh
, mpu_oh
);
2306 /* XXX what about the other system initiators here? dma, dsp */
2307 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2308 cpu_idle_poll_ctrl(false);
2309 if (soc_ops
.disable_module
)
2310 soc_ops
.disable_module(oh
);
2311 _disable_clocks(oh
);
2313 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2315 /* XXX Should this code also force-disable the optional clocks? */
2317 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
2318 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
2320 /* Mux pins to safe mode or use populated off mode values */
2322 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
2324 oh
->_state
= _HWMOD_STATE_DISABLED
;
2330 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2331 * @np: struct device_node *
2332 * @oh: struct omap_hwmod *
2334 * Parse the dt blob and find out needed hwmod. Recursive function is
2335 * implemented to take care hierarchical dt blob parsing.
2336 * Return: The device node on success or NULL on failure.
2338 static struct device_node
*of_dev_hwmod_lookup(struct device_node
*np
,
2339 struct omap_hwmod
*oh
)
2341 struct device_node
*np0
= NULL
, *np1
= NULL
;
2344 for_each_child_of_node(np
, np0
) {
2345 if (of_find_property(np0
, "ti,hwmods", NULL
)) {
2346 p
= of_get_property(np0
, "ti,hwmods", NULL
);
2347 if (!strcmp(p
, oh
->name
))
2349 np1
= of_dev_hwmod_lookup(np0
, oh
);
2358 * _init_mpu_rt_base - populate the virtual address for a hwmod
2359 * @oh: struct omap_hwmod * to locate the virtual address
2360 * @data: (unused, caller should pass NULL)
2361 * @np: struct device_node * of the IP block's device node in the DT data
2363 * Cache the virtual address used by the MPU to access this IP block's
2364 * registers. This address is needed early so the OCP registers that
2365 * are part of the device's address space can be ioremapped properly.
2367 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2368 * -ENXIO on absent or invalid register target address space.
2370 static int __init
_init_mpu_rt_base(struct omap_hwmod
*oh
, void *data
,
2371 struct device_node
*np
)
2373 struct omap_hwmod_addr_space
*mem
;
2374 void __iomem
*va_start
= NULL
;
2379 _save_mpu_port_index(oh
);
2381 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2384 mem
= _find_mpu_rt_addr_space(oh
);
2386 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2389 /* Extract the IO space from device tree blob */
2393 va_start
= of_iomap(np
, oh
->mpu_rt_idx
);
2395 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
2399 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
2403 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2404 oh
->name
, va_start
);
2406 oh
->_mpu_rt_va
= va_start
;
2411 * _init - initialize internal data for the hwmod @oh
2412 * @oh: struct omap_hwmod *
2415 * Look up the clocks and the address space used by the MPU to access
2416 * registers belonging to the hwmod @oh. @oh must already be
2417 * registered at this point. This is the first of two phases for
2418 * hwmod initialization. Code called here does not touch any hardware
2419 * registers, it simply prepares internal data structures. Returns 0
2420 * upon success or if the hwmod isn't registered or if the hwmod's
2421 * address space is not defined, or -EINVAL upon failure.
2423 static int __init
_init(struct omap_hwmod
*oh
, void *data
)
2426 struct device_node
*np
= NULL
;
2428 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
2431 if (of_have_populated_dt())
2432 np
= of_dev_hwmod_lookup(of_find_node_by_name(NULL
, "ocp"), oh
);
2434 if (oh
->class->sysc
) {
2435 r
= _init_mpu_rt_base(oh
, NULL
, np
);
2437 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2443 r
= _init_clocks(oh
, NULL
);
2445 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh
->name
);
2450 if (of_find_property(np
, "ti,no-reset-on-init", NULL
))
2451 oh
->flags
|= HWMOD_INIT_NO_RESET
;
2452 if (of_find_property(np
, "ti,no-idle-on-init", NULL
))
2453 oh
->flags
|= HWMOD_INIT_NO_IDLE
;
2455 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
2461 * _setup_iclk_autoidle - configure an IP block's interface clocks
2462 * @oh: struct omap_hwmod *
2464 * Set up the module's interface clocks. XXX This function is still mostly
2465 * a stub; implementing this properly requires iclk autoidle usecounting in
2466 * the clock code. No return value.
2468 static void __init
_setup_iclk_autoidle(struct omap_hwmod
*oh
)
2470 struct omap_hwmod_ocp_if
*os
;
2471 struct list_head
*p
;
2473 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2476 p
= oh
->slave_ports
.next
;
2478 while (i
< oh
->slaves_cnt
) {
2479 os
= _fetch_next_ocp_if(&p
, &i
);
2483 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
2484 /* XXX omap_iclk_deny_idle(c); */
2486 /* XXX omap_iclk_allow_idle(c); */
2487 clk_enable(os
->_clk
);
2495 * _setup_reset - reset an IP block during the setup process
2496 * @oh: struct omap_hwmod *
2498 * Reset the IP block corresponding to the hwmod @oh during the setup
2499 * process. The IP block is first enabled so it can be successfully
2500 * reset. Returns 0 upon success or a negative error code upon
2503 static int __init
_setup_reset(struct omap_hwmod
*oh
)
2507 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2510 if (oh
->flags
& HWMOD_EXT_OPT_MAIN_CLK
)
2513 if (oh
->rst_lines_cnt
== 0) {
2516 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2517 oh
->name
, oh
->_state
);
2522 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
))
2529 * _setup_postsetup - transition to the appropriate state after _setup
2530 * @oh: struct omap_hwmod *
2532 * Place an IP block represented by @oh into a "post-setup" state --
2533 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2534 * this function is called at the end of _setup().) The postsetup
2535 * state for an IP block can be changed by calling
2536 * omap_hwmod_enter_postsetup_state() early in the boot process,
2537 * before one of the omap_hwmod_setup*() functions are called for the
2540 * The IP block stays in this state until a PM runtime-based driver is
2541 * loaded for that IP block. A post-setup state of IDLE is
2542 * appropriate for almost all IP blocks with runtime PM-enabled
2543 * drivers, since those drivers are able to enable the IP block. A
2544 * post-setup state of ENABLED is appropriate for kernels with PM
2545 * runtime disabled. The DISABLED state is appropriate for unusual IP
2546 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2547 * included, since the WDTIMER starts running on reset and will reset
2548 * the MPU if left active.
2550 * This post-setup mechanism is deprecated. Once all of the OMAP
2551 * drivers have been converted to use PM runtime, and all of the IP
2552 * block data and interconnect data is available to the hwmod code, it
2553 * should be possible to replace this mechanism with a "lazy reset"
2554 * arrangement. In a "lazy reset" setup, each IP block is enabled
2555 * when the driver first probes, then all remaining IP blocks without
2556 * drivers are either shut down or enabled after the drivers have
2557 * loaded. However, this cannot take place until the above
2558 * preconditions have been met, since otherwise the late reset code
2559 * has no way of knowing which IP blocks are in use by drivers, and
2560 * which ones are unused.
2564 static void __init
_setup_postsetup(struct omap_hwmod
*oh
)
2568 if (oh
->rst_lines_cnt
> 0)
2571 postsetup_state
= oh
->_postsetup_state
;
2572 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
2573 postsetup_state
= _HWMOD_STATE_ENABLED
;
2576 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2577 * it should be set by the core code as a runtime flag during startup
2579 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
2580 (postsetup_state
== _HWMOD_STATE_IDLE
)) {
2581 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2582 postsetup_state
= _HWMOD_STATE_ENABLED
;
2585 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2587 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2589 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2590 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2591 oh
->name
, postsetup_state
);
2597 * _setup - prepare IP block hardware for use
2598 * @oh: struct omap_hwmod *
2599 * @n: (unused, pass NULL)
2601 * Configure the IP block represented by @oh. This may include
2602 * enabling the IP block, resetting it, and placing it into a
2603 * post-setup state, depending on the type of IP block and applicable
2604 * flags. IP blocks are reset to prevent any previous configuration
2605 * by the bootloader or previous operating system from interfering
2606 * with power management or other parts of the system. The reset can
2607 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2608 * two phases for hwmod initialization. Code called here generally
2609 * affects the IP block hardware, or system integration hardware
2610 * associated with the IP block. Returns 0.
2612 static int __init
_setup(struct omap_hwmod
*oh
, void *data
)
2614 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2617 _setup_iclk_autoidle(oh
);
2619 if (!_setup_reset(oh
))
2620 _setup_postsetup(oh
);
2626 * _register - register a struct omap_hwmod
2627 * @oh: struct omap_hwmod *
2629 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2630 * already has been registered by the same name; -EINVAL if the
2631 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2632 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2633 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2636 * XXX The data should be copied into bootmem, so the original data
2637 * should be marked __initdata and freed after init. This would allow
2638 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2639 * that the copy process would be relatively complex due to the large number
2642 static int __init
_register(struct omap_hwmod
*oh
)
2644 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
2645 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
2648 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
2650 if (_lookup(oh
->name
))
2653 list_add_tail(&oh
->node
, &omap_hwmod_list
);
2655 INIT_LIST_HEAD(&oh
->master_ports
);
2656 INIT_LIST_HEAD(&oh
->slave_ports
);
2657 spin_lock_init(&oh
->_lock
);
2659 oh
->_state
= _HWMOD_STATE_REGISTERED
;
2662 * XXX Rather than doing a strcmp(), this should test a flag
2663 * set in the hwmod data, inserted by the autogenerator code.
2665 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
2672 * _alloc_links - return allocated memory for hwmod links
2673 * @ml: pointer to a struct omap_hwmod_link * for the master link
2674 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2676 * Return pointers to two struct omap_hwmod_link records, via the
2677 * addresses pointed to by @ml and @sl. Will first attempt to return
2678 * memory allocated as part of a large initial block, but if that has
2679 * been exhausted, will allocate memory itself. Since ideally this
2680 * second allocation path will never occur, the number of these
2681 * 'supplemental' allocations will be logged when debugging is
2682 * enabled. Returns 0.
2684 static int __init
_alloc_links(struct omap_hwmod_link
**ml
,
2685 struct omap_hwmod_link
**sl
)
2689 if ((free_ls
+ LINKS_PER_OCP_IF
) <= max_ls
) {
2690 *ml
= &linkspace
[free_ls
++];
2691 *sl
= &linkspace
[free_ls
++];
2695 sz
= sizeof(struct omap_hwmod_link
) * LINKS_PER_OCP_IF
;
2698 *ml
= alloc_bootmem(sz
);
2702 *sl
= (void *)(*ml
) + sizeof(struct omap_hwmod_link
);
2705 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2706 ls_supp
* LINKS_PER_OCP_IF
);
2712 * _add_link - add an interconnect between two IP blocks
2713 * @oi: pointer to a struct omap_hwmod_ocp_if record
2715 * Add struct omap_hwmod_link records connecting the master IP block
2716 * specified in @oi->master to @oi, and connecting the slave IP block
2717 * specified in @oi->slave to @oi. This code is assumed to run before
2718 * preemption or SMP has been enabled, thus avoiding the need for
2719 * locking in this code. Changes to this assumption will require
2720 * additional locking. Returns 0.
2722 static int __init
_add_link(struct omap_hwmod_ocp_if
*oi
)
2724 struct omap_hwmod_link
*ml
, *sl
;
2726 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi
->master
->name
,
2729 _alloc_links(&ml
, &sl
);
2732 INIT_LIST_HEAD(&ml
->node
);
2733 list_add(&ml
->node
, &oi
->master
->master_ports
);
2734 oi
->master
->masters_cnt
++;
2737 INIT_LIST_HEAD(&sl
->node
);
2738 list_add(&sl
->node
, &oi
->slave
->slave_ports
);
2739 oi
->slave
->slaves_cnt
++;
2745 * _register_link - register a struct omap_hwmod_ocp_if
2746 * @oi: struct omap_hwmod_ocp_if *
2748 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2749 * has already been registered; -EINVAL if @oi is NULL or if the
2750 * record pointed to by @oi is missing required fields; or 0 upon
2753 * XXX The data should be copied into bootmem, so the original data
2754 * should be marked __initdata and freed after init. This would allow
2755 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2757 static int __init
_register_link(struct omap_hwmod_ocp_if
*oi
)
2759 if (!oi
|| !oi
->master
|| !oi
->slave
|| !oi
->user
)
2762 if (oi
->_int_flags
& _OCPIF_INT_FLAGS_REGISTERED
)
2765 pr_debug("omap_hwmod: registering link from %s to %s\n",
2766 oi
->master
->name
, oi
->slave
->name
);
2769 * Register the connected hwmods, if they haven't been
2770 * registered already
2772 if (oi
->master
->_state
!= _HWMOD_STATE_REGISTERED
)
2773 _register(oi
->master
);
2775 if (oi
->slave
->_state
!= _HWMOD_STATE_REGISTERED
)
2776 _register(oi
->slave
);
2780 oi
->_int_flags
|= _OCPIF_INT_FLAGS_REGISTERED
;
2786 * _alloc_linkspace - allocate large block of hwmod links
2787 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2789 * Allocate a large block of struct omap_hwmod_link records. This
2790 * improves boot time significantly by avoiding the need to allocate
2791 * individual records one by one. If the number of records to
2792 * allocate in the block hasn't been manually specified, this function
2793 * will count the number of struct omap_hwmod_ocp_if records in @ois
2794 * and use that to determine the allocation size. For SoC families
2795 * that require multiple list registrations, such as OMAP3xxx, this
2796 * estimation process isn't optimal, so manual estimation is advised
2797 * in those cases. Returns -EEXIST if the allocation has already occurred
2798 * or 0 upon success.
2800 static int __init
_alloc_linkspace(struct omap_hwmod_ocp_if
**ois
)
2806 WARN(1, "linkspace already allocated\n");
2812 max_ls
+= LINKS_PER_OCP_IF
;
2814 sz
= sizeof(struct omap_hwmod_link
) * max_ls
;
2816 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2817 __func__
, sz
, max_ls
);
2819 linkspace
= alloc_bootmem(sz
);
2821 memset(linkspace
, 0, sz
);
2826 /* Static functions intended only for use in soc_ops field function pointers */
2829 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2830 * @oh: struct omap_hwmod *
2832 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2833 * does not have an IDLEST bit or if the module successfully leaves
2834 * slave idle; otherwise, pass along the return value of the
2835 * appropriate *_cm*_wait_module_ready() function.
2837 static int _omap2xxx_wait_target_ready(struct omap_hwmod
*oh
)
2842 if (oh
->flags
& HWMOD_NO_IDLEST
)
2845 if (!_find_mpu_rt_port(oh
))
2848 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2850 return omap2xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2851 oh
->prcm
.omap2
.idlest_reg_id
,
2852 oh
->prcm
.omap2
.idlest_idle_bit
);
2856 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2857 * @oh: struct omap_hwmod *
2859 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2860 * does not have an IDLEST bit or if the module successfully leaves
2861 * slave idle; otherwise, pass along the return value of the
2862 * appropriate *_cm*_wait_module_ready() function.
2864 static int _omap3xxx_wait_target_ready(struct omap_hwmod
*oh
)
2869 if (oh
->flags
& HWMOD_NO_IDLEST
)
2872 if (!_find_mpu_rt_port(oh
))
2875 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2877 return omap3xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2878 oh
->prcm
.omap2
.idlest_reg_id
,
2879 oh
->prcm
.omap2
.idlest_idle_bit
);
2883 * _omap4_wait_target_ready - wait for a module to leave slave idle
2884 * @oh: struct omap_hwmod *
2886 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2887 * does not have an IDLEST bit or if the module successfully leaves
2888 * slave idle; otherwise, pass along the return value of the
2889 * appropriate *_cm*_wait_module_ready() function.
2891 static int _omap4_wait_target_ready(struct omap_hwmod
*oh
)
2896 if (oh
->flags
& HWMOD_NO_IDLEST
|| !oh
->clkdm
)
2899 if (!_find_mpu_rt_port(oh
))
2902 /* XXX check module SIDLEMODE, hardreset status */
2904 return omap4_cminst_wait_module_ready(oh
->clkdm
->prcm_partition
,
2906 oh
->clkdm
->clkdm_offs
,
2907 oh
->prcm
.omap4
.clkctrl_offs
);
2911 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2912 * @oh: struct omap_hwmod *
2914 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2915 * does not have an IDLEST bit or if the module successfully leaves
2916 * slave idle; otherwise, pass along the return value of the
2917 * appropriate *_cm*_wait_module_ready() function.
2919 static int _am33xx_wait_target_ready(struct omap_hwmod
*oh
)
2921 if (!oh
|| !oh
->clkdm
)
2924 if (oh
->flags
& HWMOD_NO_IDLEST
)
2927 if (!_find_mpu_rt_port(oh
))
2930 /* XXX check module SIDLEMODE, hardreset status */
2932 return am33xx_cm_wait_module_ready(oh
->clkdm
->cm_inst
,
2933 oh
->clkdm
->clkdm_offs
,
2934 oh
->prcm
.omap4
.clkctrl_offs
);
2938 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2939 * @oh: struct omap_hwmod * to assert hardreset
2940 * @ohri: hardreset line data
2942 * Call omap2_prm_assert_hardreset() with parameters extracted from
2943 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2944 * use as an soc_ops function pointer. Passes along the return value
2945 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2946 * for removal when the PRM code is moved into drivers/.
2948 static int _omap2_assert_hardreset(struct omap_hwmod
*oh
,
2949 struct omap_hwmod_rst_info
*ohri
)
2951 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
2956 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2957 * @oh: struct omap_hwmod * to deassert hardreset
2958 * @ohri: hardreset line data
2960 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2961 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2962 * use as an soc_ops function pointer. Passes along the return value
2963 * from omap2_prm_deassert_hardreset(). XXX This function is
2964 * scheduled for removal when the PRM code is moved into drivers/.
2966 static int _omap2_deassert_hardreset(struct omap_hwmod
*oh
,
2967 struct omap_hwmod_rst_info
*ohri
)
2969 return omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
2975 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2976 * @oh: struct omap_hwmod * to test hardreset
2977 * @ohri: hardreset line data
2979 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2980 * from the hwmod @oh and the hardreset line data @ohri. Only
2981 * intended for use as an soc_ops function pointer. Passes along the
2982 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2983 * function is scheduled for removal when the PRM code is moved into
2986 static int _omap2_is_hardreset_asserted(struct omap_hwmod
*oh
,
2987 struct omap_hwmod_rst_info
*ohri
)
2989 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
2994 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2995 * @oh: struct omap_hwmod * to assert hardreset
2996 * @ohri: hardreset line data
2998 * Call omap4_prminst_assert_hardreset() with parameters extracted
2999 * from the hwmod @oh and the hardreset line data @ohri. Only
3000 * intended for use as an soc_ops function pointer. Passes along the
3001 * return value from omap4_prminst_assert_hardreset(). XXX This
3002 * function is scheduled for removal when the PRM code is moved into
3005 static int _omap4_assert_hardreset(struct omap_hwmod
*oh
,
3006 struct omap_hwmod_rst_info
*ohri
)
3011 return omap4_prminst_assert_hardreset(ohri
->rst_shift
,
3012 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3013 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3014 oh
->prcm
.omap4
.rstctrl_offs
);
3018 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3019 * @oh: struct omap_hwmod * to deassert hardreset
3020 * @ohri: hardreset line data
3022 * Call omap4_prminst_deassert_hardreset() with parameters extracted
3023 * from the hwmod @oh and the hardreset line data @ohri. Only
3024 * intended for use as an soc_ops function pointer. Passes along the
3025 * return value from omap4_prminst_deassert_hardreset(). XXX This
3026 * function is scheduled for removal when the PRM code is moved into
3029 static int _omap4_deassert_hardreset(struct omap_hwmod
*oh
,
3030 struct omap_hwmod_rst_info
*ohri
)
3036 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3037 oh
->name
, ohri
->name
);
3038 return omap4_prminst_deassert_hardreset(ohri
->rst_shift
,
3039 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3040 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3041 oh
->prcm
.omap4
.rstctrl_offs
);
3045 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3046 * @oh: struct omap_hwmod * to test hardreset
3047 * @ohri: hardreset line data
3049 * Call omap4_prminst_is_hardreset_asserted() with parameters
3050 * extracted from the hwmod @oh and the hardreset line data @ohri.
3051 * Only intended for use as an soc_ops function pointer. Passes along
3052 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3053 * This function is scheduled for removal when the PRM code is moved
3056 static int _omap4_is_hardreset_asserted(struct omap_hwmod
*oh
,
3057 struct omap_hwmod_rst_info
*ohri
)
3062 return omap4_prminst_is_hardreset_asserted(ohri
->rst_shift
,
3063 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3064 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3065 oh
->prcm
.omap4
.rstctrl_offs
);
3069 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3070 * @oh: struct omap_hwmod * to assert hardreset
3071 * @ohri: hardreset line data
3073 * Call am33xx_prminst_assert_hardreset() with parameters extracted
3074 * from the hwmod @oh and the hardreset line data @ohri. Only
3075 * intended for use as an soc_ops function pointer. Passes along the
3076 * return value from am33xx_prminst_assert_hardreset(). XXX This
3077 * function is scheduled for removal when the PRM code is moved into
3080 static int _am33xx_assert_hardreset(struct omap_hwmod
*oh
,
3081 struct omap_hwmod_rst_info
*ohri
)
3084 return am33xx_prm_assert_hardreset(ohri
->rst_shift
,
3085 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3086 oh
->prcm
.omap4
.rstctrl_offs
);
3090 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3091 * @oh: struct omap_hwmod * to deassert hardreset
3092 * @ohri: hardreset line data
3094 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3095 * from the hwmod @oh and the hardreset line data @ohri. Only
3096 * intended for use as an soc_ops function pointer. Passes along the
3097 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3098 * function is scheduled for removal when the PRM code is moved into
3101 static int _am33xx_deassert_hardreset(struct omap_hwmod
*oh
,
3102 struct omap_hwmod_rst_info
*ohri
)
3104 return am33xx_prm_deassert_hardreset(ohri
->rst_shift
,
3106 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3107 oh
->prcm
.omap4
.rstctrl_offs
,
3108 oh
->prcm
.omap4
.rstst_offs
);
3112 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
3113 * @oh: struct omap_hwmod * to test hardreset
3114 * @ohri: hardreset line data
3116 * Call am33xx_prminst_is_hardreset_asserted() with parameters
3117 * extracted from the hwmod @oh and the hardreset line data @ohri.
3118 * Only intended for use as an soc_ops function pointer. Passes along
3119 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
3120 * This function is scheduled for removal when the PRM code is moved
3123 static int _am33xx_is_hardreset_asserted(struct omap_hwmod
*oh
,
3124 struct omap_hwmod_rst_info
*ohri
)
3126 return am33xx_prm_is_hardreset_asserted(ohri
->rst_shift
,
3127 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3128 oh
->prcm
.omap4
.rstctrl_offs
);
3131 /* Public functions */
3133 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
3135 if (oh
->flags
& HWMOD_16BIT_REG
)
3136 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
3138 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
3141 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
3143 if (oh
->flags
& HWMOD_16BIT_REG
)
3144 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
3146 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
3150 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3151 * @oh: struct omap_hwmod *
3153 * This is a public function exposed to drivers. Some drivers may need to do
3154 * some settings before and after resetting the device. Those drivers after
3155 * doing the necessary settings could use this function to start a reset by
3156 * setting the SYSCONFIG.SOFTRESET bit.
3158 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
3163 if (!oh
|| !(oh
->_sysc_cache
))
3166 v
= oh
->_sysc_cache
;
3167 ret
= _set_softreset(oh
, &v
);
3170 _write_sysconfig(v
, oh
);
3177 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3178 * @name: name of the omap_hwmod to look up
3180 * Given a @name of an omap_hwmod, return a pointer to the registered
3181 * struct omap_hwmod *, or NULL upon error.
3183 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
3185 struct omap_hwmod
*oh
;
3196 * omap_hwmod_for_each - call function for each registered omap_hwmod
3197 * @fn: pointer to a callback function
3198 * @data: void * data to pass to callback function
3200 * Call @fn for each registered omap_hwmod, passing @data to each
3201 * function. @fn must return 0 for success or any other value for
3202 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3203 * will stop and the non-zero return value will be passed to the
3204 * caller of omap_hwmod_for_each(). @fn is called with
3205 * omap_hwmod_for_each() held.
3207 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
3210 struct omap_hwmod
*temp_oh
;
3216 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3217 ret
= (*fn
)(temp_oh
, data
);
3226 * omap_hwmod_register_links - register an array of hwmod links
3227 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3229 * Intended to be called early in boot before the clock framework is
3230 * initialized. If @ois is not null, will register all omap_hwmods
3231 * listed in @ois that are valid for this chip. Returns -EINVAL if
3232 * omap_hwmod_init() hasn't been called before calling this function,
3233 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3236 int __init
omap_hwmod_register_links(struct omap_hwmod_ocp_if
**ois
)
3247 if (_alloc_linkspace(ois
)) {
3248 pr_err("omap_hwmod: could not allocate link space\n");
3255 r
= _register_link(ois
[i
]);
3256 WARN(r
&& r
!= -EEXIST
,
3257 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3258 ois
[i
]->master
->name
, ois
[i
]->slave
->name
, r
);
3265 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3266 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3268 * If the hwmod data corresponding to the MPU subsystem IP block
3269 * hasn't been initialized and set up yet, do so now. This must be
3270 * done first since sleep dependencies may be added from other hwmods
3271 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3274 static void __init
_ensure_mpu_hwmod_is_setup(struct omap_hwmod
*oh
)
3276 if (!mpu_oh
|| mpu_oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3277 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3278 __func__
, MPU_INITIATOR_NAME
);
3279 else if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
3280 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
3284 * omap_hwmod_setup_one - set up a single hwmod
3285 * @oh_name: const char * name of the already-registered hwmod to set up
3287 * Initialize and set up a single hwmod. Intended to be used for a
3288 * small number of early devices, such as the timer IP blocks used for
3289 * the scheduler clock. Must be called after omap2_clk_init().
3290 * Resolves the struct clk names to struct clk pointers for each
3291 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3292 * -EINVAL upon error or 0 upon success.
3294 int __init
omap_hwmod_setup_one(const char *oh_name
)
3296 struct omap_hwmod
*oh
;
3298 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
3300 oh
= _lookup(oh_name
);
3302 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
3306 _ensure_mpu_hwmod_is_setup(oh
);
3315 * omap_hwmod_setup_all - set up all registered IP blocks
3317 * Initialize and set up all IP blocks registered with the hwmod code.
3318 * Must be called after omap2_clk_init(). Resolves the struct clk
3319 * names to struct clk pointers for each registered omap_hwmod. Also
3320 * calls _setup() on each hwmod. Returns 0 upon success.
3322 static int __init
omap_hwmod_setup_all(void)
3324 _ensure_mpu_hwmod_is_setup(NULL
);
3326 omap_hwmod_for_each(_init
, NULL
);
3327 omap_hwmod_for_each(_setup
, NULL
);
3331 omap_core_initcall(omap_hwmod_setup_all
);
3334 * omap_hwmod_enable - enable an omap_hwmod
3335 * @oh: struct omap_hwmod *
3337 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3338 * Returns -EINVAL on error or passes along the return value from _enable().
3340 int omap_hwmod_enable(struct omap_hwmod
*oh
)
3343 unsigned long flags
;
3348 spin_lock_irqsave(&oh
->_lock
, flags
);
3350 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3356 * omap_hwmod_idle - idle an omap_hwmod
3357 * @oh: struct omap_hwmod *
3359 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3360 * Returns -EINVAL on error or passes along the return value from _idle().
3362 int omap_hwmod_idle(struct omap_hwmod
*oh
)
3364 unsigned long flags
;
3369 spin_lock_irqsave(&oh
->_lock
, flags
);
3371 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3377 * omap_hwmod_shutdown - shutdown an omap_hwmod
3378 * @oh: struct omap_hwmod *
3380 * Shutdown an omap_hwmod @oh. Intended to be called by
3381 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3382 * the return value from _shutdown().
3384 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
3386 unsigned long flags
;
3391 spin_lock_irqsave(&oh
->_lock
, flags
);
3393 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3399 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3400 * @oh: struct omap_hwmod *oh
3402 * Intended to be called by the omap_device code.
3404 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
3406 unsigned long flags
;
3408 spin_lock_irqsave(&oh
->_lock
, flags
);
3410 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3416 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3417 * @oh: struct omap_hwmod *oh
3419 * Intended to be called by the omap_device code.
3421 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
3423 unsigned long flags
;
3425 spin_lock_irqsave(&oh
->_lock
, flags
);
3426 _disable_clocks(oh
);
3427 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3433 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3434 * @oh: struct omap_hwmod *oh
3436 * Intended to be called by drivers and core code when all posted
3437 * writes to a device must complete before continuing further
3438 * execution (for example, after clearing some device IRQSTATUS
3441 * XXX what about targets with multiple OCP threads?
3443 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
3447 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
3448 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3454 * Forces posted writes to complete on the OCP thread handling
3457 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
3461 * omap_hwmod_reset - reset the hwmod
3462 * @oh: struct omap_hwmod *
3464 * Under some conditions, a driver may wish to reset the entire device.
3465 * Called from omap_device code. Returns -EINVAL on error or passes along
3466 * the return value from _reset().
3468 int omap_hwmod_reset(struct omap_hwmod
*oh
)
3471 unsigned long flags
;
3476 spin_lock_irqsave(&oh
->_lock
, flags
);
3478 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3484 * IP block data retrieval functions
3488 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3489 * @oh: struct omap_hwmod *
3490 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3492 * Count the number of struct resource array elements necessary to
3493 * contain omap_hwmod @oh resources. Intended to be called by code
3494 * that registers omap_devices. Intended to be used to determine the
3495 * size of a dynamically-allocated struct resource array, before
3496 * calling omap_hwmod_fill_resources(). Returns the number of struct
3497 * resource array elements needed.
3499 * XXX This code is not optimized. It could attempt to merge adjacent
3503 int omap_hwmod_count_resources(struct omap_hwmod
*oh
, unsigned long flags
)
3507 if (flags
& IORESOURCE_IRQ
)
3508 ret
+= _count_mpu_irqs(oh
);
3510 if (flags
& IORESOURCE_DMA
)
3511 ret
+= _count_sdma_reqs(oh
);
3513 if (flags
& IORESOURCE_MEM
) {
3515 struct omap_hwmod_ocp_if
*os
;
3516 struct list_head
*p
= oh
->slave_ports
.next
;
3518 while (i
< oh
->slaves_cnt
) {
3519 os
= _fetch_next_ocp_if(&p
, &i
);
3520 ret
+= _count_ocp_if_addr_spaces(os
);
3528 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3529 * @oh: struct omap_hwmod *
3530 * @res: pointer to the first element of an array of struct resource to fill
3532 * Fill the struct resource array @res with resource data from the
3533 * omap_hwmod @oh. Intended to be called by code that registers
3534 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3535 * number of array elements filled.
3537 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3539 struct omap_hwmod_ocp_if
*os
;
3540 struct list_head
*p
;
3541 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
, addr_cnt
;
3544 /* For each IRQ, DMA, memory area, fill in array.*/
3546 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
3547 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
3548 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
3549 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
3550 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
3551 (res
+ r
)->flags
= IORESOURCE_IRQ
;
3555 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3556 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3557 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3558 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3559 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3560 (res
+ r
)->flags
= IORESOURCE_DMA
;
3564 p
= oh
->slave_ports
.next
;
3567 while (i
< oh
->slaves_cnt
) {
3568 os
= _fetch_next_ocp_if(&p
, &i
);
3569 addr_cnt
= _count_ocp_if_addr_spaces(os
);
3571 for (j
= 0; j
< addr_cnt
; j
++) {
3572 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
3573 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
3574 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
3575 (res
+ r
)->flags
= IORESOURCE_MEM
;
3584 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3585 * @oh: struct omap_hwmod *
3586 * @res: pointer to the array of struct resource to fill
3588 * Fill the struct resource array @res with dma resource data from the
3589 * omap_hwmod @oh. Intended to be called by code that registers
3590 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3591 * number of array elements filled.
3593 int omap_hwmod_fill_dma_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3595 int i
, sdma_reqs_cnt
;
3598 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3599 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3600 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3601 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3602 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3603 (res
+ r
)->flags
= IORESOURCE_DMA
;
3611 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3612 * @oh: struct omap_hwmod * to operate on
3613 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3614 * @name: pointer to the name of the data to fetch (optional)
3615 * @rsrc: pointer to a struct resource, allocated by the caller
3617 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3618 * data for the IP block pointed to by @oh. The data will be filled
3619 * into a struct resource record pointed to by @rsrc. The struct
3620 * resource must be allocated by the caller. When @name is non-null,
3621 * the data associated with the matching entry in the IRQ/SDMA/address
3622 * space hwmod data arrays will be returned. If @name is null, the
3623 * first array entry will be returned. Data order is not meaningful
3624 * in hwmod data, so callers are strongly encouraged to use a non-null
3625 * @name whenever possible to avoid unpredictable effects if hwmod
3626 * data is later added that causes data ordering to change. This
3627 * function is only intended for use by OMAP core code. Device
3628 * drivers should not call this function - the appropriate bus-related
3629 * data accessor functions should be used instead. Returns 0 upon
3630 * success or a negative error code upon error.
3632 int omap_hwmod_get_resource_byname(struct omap_hwmod
*oh
, unsigned int type
,
3633 const char *name
, struct resource
*rsrc
)
3636 unsigned int irq
, dma
;
3637 u32 pa_start
, pa_end
;
3642 if (type
== IORESOURCE_IRQ
) {
3643 r
= _get_mpu_irq_by_name(oh
, name
, &irq
);
3649 } else if (type
== IORESOURCE_DMA
) {
3650 r
= _get_sdma_req_by_name(oh
, name
, &dma
);
3656 } else if (type
== IORESOURCE_MEM
) {
3657 r
= _get_addr_space_by_name(oh
, name
, &pa_start
, &pa_end
);
3661 rsrc
->start
= pa_start
;
3674 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3675 * @oh: struct omap_hwmod *
3677 * Return the powerdomain pointer associated with the OMAP module
3678 * @oh's main clock. If @oh does not have a main clk, return the
3679 * powerdomain associated with the interface clock associated with the
3680 * module's MPU port. (XXX Perhaps this should use the SDMA port
3681 * instead?) Returns NULL on error, or a struct powerdomain * on
3684 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
3687 struct omap_hwmod_ocp_if
*oi
;
3688 struct clockdomain
*clkdm
;
3689 struct clk_hw_omap
*clk
;
3695 return oh
->clkdm
->pwrdm
.ptr
;
3700 oi
= _find_mpu_rt_port(oh
);
3706 clk
= to_clk_hw_omap(__clk_get_hw(c
));
3711 return clkdm
->pwrdm
.ptr
;
3715 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3716 * @oh: struct omap_hwmod *
3718 * Returns the virtual address corresponding to the beginning of the
3719 * module's register target, in the address range that is intended to
3720 * be used by the MPU. Returns the virtual address upon success or NULL
3723 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
3728 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
3731 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3734 return oh
->_mpu_rt_va
;
3738 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3739 * @oh: struct omap_hwmod *
3740 * @init_oh: struct omap_hwmod * (initiator)
3742 * Add a sleep dependency between the initiator @init_oh and @oh.
3743 * Intended to be called by DSP/Bridge code via platform_data for the
3744 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3745 * code needs to add/del initiator dependencies dynamically
3746 * before/after accessing a device. Returns the return value from
3747 * _add_initiator_dep().
3749 * XXX Keep a usecount in the clockdomain code
3751 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
3752 struct omap_hwmod
*init_oh
)
3754 return _add_initiator_dep(oh
, init_oh
);
3758 * XXX what about functions for drivers to save/restore ocp_sysconfig
3759 * for context save/restore operations?
3763 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3764 * @oh: struct omap_hwmod *
3765 * @init_oh: struct omap_hwmod * (initiator)
3767 * Remove a sleep dependency between the initiator @init_oh and @oh.
3768 * Intended to be called by DSP/Bridge code via platform_data for the
3769 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3770 * code needs to add/del initiator dependencies dynamically
3771 * before/after accessing a device. Returns the return value from
3772 * _del_initiator_dep().
3774 * XXX Keep a usecount in the clockdomain code
3776 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
3777 struct omap_hwmod
*init_oh
)
3779 return _del_initiator_dep(oh
, init_oh
);
3783 * omap_hwmod_enable_wakeup - allow device to wake up the system
3784 * @oh: struct omap_hwmod *
3786 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3787 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3788 * this IP block if it has dynamic mux entries. Eventually this
3789 * should set PRCM wakeup registers to cause the PRCM to receive
3790 * wakeup events from the module. Does not set any wakeup routing
3791 * registers beyond this point - if the module is to wake up any other
3792 * module or subsystem, that must be set separately. Called by
3793 * omap_device code. Returns -EINVAL on error or 0 upon success.
3795 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
3797 unsigned long flags
;
3800 spin_lock_irqsave(&oh
->_lock
, flags
);
3802 if (oh
->class->sysc
&&
3803 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3804 v
= oh
->_sysc_cache
;
3805 _enable_wakeup(oh
, &v
);
3806 _write_sysconfig(v
, oh
);
3809 _set_idle_ioring_wakeup(oh
, true);
3810 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3816 * omap_hwmod_disable_wakeup - prevent device from waking the system
3817 * @oh: struct omap_hwmod *
3819 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3820 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3821 * events for this IP block if it has dynamic mux entries. Eventually
3822 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3823 * wakeup events from the module. Does not set any wakeup routing
3824 * registers beyond this point - if the module is to wake up any other
3825 * module or subsystem, that must be set separately. Called by
3826 * omap_device code. Returns -EINVAL on error or 0 upon success.
3828 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
3830 unsigned long flags
;
3833 spin_lock_irqsave(&oh
->_lock
, flags
);
3835 if (oh
->class->sysc
&&
3836 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3837 v
= oh
->_sysc_cache
;
3838 _disable_wakeup(oh
, &v
);
3839 _write_sysconfig(v
, oh
);
3842 _set_idle_ioring_wakeup(oh
, false);
3843 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3849 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3850 * contained in the hwmod module.
3851 * @oh: struct omap_hwmod *
3852 * @name: name of the reset line to lookup and assert
3854 * Some IP like dsp, ipu or iva contain processor that require
3855 * an HW reset line to be assert / deassert in order to enable fully
3856 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3857 * yet supported on this OMAP; otherwise, passes along the return value
3858 * from _assert_hardreset().
3860 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3863 unsigned long flags
;
3868 spin_lock_irqsave(&oh
->_lock
, flags
);
3869 ret
= _assert_hardreset(oh
, name
);
3870 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3876 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3877 * contained in the hwmod module.
3878 * @oh: struct omap_hwmod *
3879 * @name: name of the reset line to look up and deassert
3881 * Some IP like dsp, ipu or iva contain processor that require
3882 * an HW reset line to be assert / deassert in order to enable fully
3883 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3884 * yet supported on this OMAP; otherwise, passes along the return value
3885 * from _deassert_hardreset().
3887 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3890 unsigned long flags
;
3895 spin_lock_irqsave(&oh
->_lock
, flags
);
3896 ret
= _deassert_hardreset(oh
, name
);
3897 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3903 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3904 * contained in the hwmod module
3905 * @oh: struct omap_hwmod *
3906 * @name: name of the reset line to look up and read
3908 * Return the current state of the hwmod @oh's reset line named @name:
3909 * returns -EINVAL upon parameter error or if this operation
3910 * is unsupported on the current OMAP; otherwise, passes along the return
3911 * value from _read_hardreset().
3913 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
3916 unsigned long flags
;
3921 spin_lock_irqsave(&oh
->_lock
, flags
);
3922 ret
= _read_hardreset(oh
, name
);
3923 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3930 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3931 * @classname: struct omap_hwmod_class name to search for
3932 * @fn: callback function pointer to call for each hwmod in class @classname
3933 * @user: arbitrary context data to pass to the callback function
3935 * For each omap_hwmod of class @classname, call @fn.
3936 * If the callback function returns something other than
3937 * zero, the iterator is terminated, and the callback function's return
3938 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3939 * if @classname or @fn are NULL, or passes back the error code from @fn.
3941 int omap_hwmod_for_each_by_class(const char *classname
,
3942 int (*fn
)(struct omap_hwmod
*oh
,
3946 struct omap_hwmod
*temp_oh
;
3949 if (!classname
|| !fn
)
3952 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3953 __func__
, classname
);
3955 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3956 if (!strcmp(temp_oh
->class->name
, classname
)) {
3957 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3958 __func__
, temp_oh
->name
);
3959 ret
= (*fn
)(temp_oh
, user
);
3966 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3973 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3974 * @oh: struct omap_hwmod *
3975 * @state: state that _setup() should leave the hwmod in
3977 * Sets the hwmod state that @oh will enter at the end of _setup()
3978 * (called by omap_hwmod_setup_*()). See also the documentation
3979 * for _setup_postsetup(), above. Returns 0 upon success or
3980 * -EINVAL if there is a problem with the arguments or if the hwmod is
3981 * in the wrong state.
3983 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
3986 unsigned long flags
;
3991 if (state
!= _HWMOD_STATE_DISABLED
&&
3992 state
!= _HWMOD_STATE_ENABLED
&&
3993 state
!= _HWMOD_STATE_IDLE
)
3996 spin_lock_irqsave(&oh
->_lock
, flags
);
3998 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
4003 oh
->_postsetup_state
= state
;
4007 spin_unlock_irqrestore(&oh
->_lock
, flags
);
4013 * omap_hwmod_get_context_loss_count - get lost context count
4014 * @oh: struct omap_hwmod *
4016 * Returns the context loss count of associated @oh
4017 * upon success, or zero if no context loss data is available.
4019 * On OMAP4, this queries the per-hwmod context loss register,
4020 * assuming one exists. If not, or on OMAP2/3, this queries the
4021 * enclosing powerdomain context loss count.
4023 int omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
4025 struct powerdomain
*pwrdm
;
4028 if (soc_ops
.get_context_lost
)
4029 return soc_ops
.get_context_lost(oh
);
4031 pwrdm
= omap_hwmod_get_pwrdm(oh
);
4033 ret
= pwrdm_get_context_loss_count(pwrdm
);
4039 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
4040 * @oh: struct omap_hwmod *
4042 * Prevent the hwmod @oh from being reset during the setup process.
4043 * Intended for use by board-*.c files on boards with devices that
4044 * cannot tolerate being reset. Must be called before the hwmod has
4045 * been set up. Returns 0 upon success or negative error code upon
4048 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
4053 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
4054 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
4059 oh
->flags
|= HWMOD_INIT_NO_RESET
;
4065 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
4066 * @oh: struct omap_hwmod * containing hwmod mux entries
4067 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
4068 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
4070 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
4071 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
4072 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
4073 * this function is not called for a given pad_idx, then the ISR
4074 * associated with @oh's first MPU IRQ will be triggered when an I/O
4075 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
4076 * the _dynamic or wakeup_ entry: if there are other entries not
4077 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
4078 * entries are NOT COUNTED in the dynamic pad index. This function
4079 * must be called separately for each pad that requires its interrupt
4080 * to be re-routed this way. Returns -EINVAL if there is an argument
4081 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
4082 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
4084 * XXX This function interface is fragile. Rather than using array
4085 * indexes, which are subject to unpredictable change, it should be
4086 * using hwmod IRQ names, and some other stable key for the hwmod mux
4089 int omap_hwmod_pad_route_irq(struct omap_hwmod
*oh
, int pad_idx
, int irq_idx
)
4095 if (!oh
|| !oh
->mux
|| !oh
->mpu_irqs
|| pad_idx
< 0 ||
4096 pad_idx
>= oh
->mux
->nr_pads_dynamic
)
4099 /* Check the number of available mpu_irqs */
4100 for (nr_irqs
= 0; oh
->mpu_irqs
[nr_irqs
].irq
>= 0; nr_irqs
++)
4103 if (irq_idx
>= nr_irqs
)
4106 if (!oh
->mux
->irqs
) {
4107 /* XXX What frees this? */
4108 oh
->mux
->irqs
= kzalloc(sizeof(int) * oh
->mux
->nr_pads_dynamic
,
4113 oh
->mux
->irqs
[pad_idx
] = irq_idx
;
4119 * omap_hwmod_init - initialize the hwmod code
4121 * Sets up some function pointers needed by the hwmod code to operate on the
4122 * currently-booted SoC. Intended to be called once during kernel init
4123 * before any hwmods are registered. No return value.
4125 void __init
omap_hwmod_init(void)
4127 if (cpu_is_omap24xx()) {
4128 soc_ops
.wait_target_ready
= _omap2xxx_wait_target_ready
;
4129 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
4130 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
4131 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
4132 } else if (cpu_is_omap34xx()) {
4133 soc_ops
.wait_target_ready
= _omap3xxx_wait_target_ready
;
4134 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
4135 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
4136 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
4137 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
4138 soc_ops
.enable_module
= _omap4_enable_module
;
4139 soc_ops
.disable_module
= _omap4_disable_module
;
4140 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
4141 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
4142 soc_ops
.deassert_hardreset
= _omap4_deassert_hardreset
;
4143 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
4144 soc_ops
.init_clkdm
= _init_clkdm
;
4145 soc_ops
.update_context_lost
= _omap4_update_context_lost
;
4146 soc_ops
.get_context_lost
= _omap4_get_context_lost
;
4147 } else if (soc_is_am43xx()) {
4148 soc_ops
.enable_module
= _omap4_enable_module
;
4149 soc_ops
.disable_module
= _omap4_disable_module
;
4150 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
4151 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
4152 soc_ops
.deassert_hardreset
= _omap4_deassert_hardreset
;
4153 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
4154 soc_ops
.init_clkdm
= _init_clkdm
;
4155 } else if (soc_is_am33xx()) {
4156 soc_ops
.enable_module
= _am33xx_enable_module
;
4157 soc_ops
.disable_module
= _am33xx_disable_module
;
4158 soc_ops
.wait_target_ready
= _am33xx_wait_target_ready
;
4159 soc_ops
.assert_hardreset
= _am33xx_assert_hardreset
;
4160 soc_ops
.deassert_hardreset
= _am33xx_deassert_hardreset
;
4161 soc_ops
.is_hardreset_asserted
= _am33xx_is_hardreset_asserted
;
4162 soc_ops
.init_clkdm
= _init_clkdm
;
4164 WARN(1, "omap_hwmod: unknown SoC type\n");
4171 * omap_hwmod_get_main_clk - get pointer to main clock name
4172 * @oh: struct omap_hwmod *
4174 * Returns the main clock name assocated with @oh upon success,
4175 * or NULL if @oh is NULL.
4177 const char *omap_hwmod_get_main_clk(struct omap_hwmod
*oh
)
4182 return oh
->main_clk
;