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 * | ({read,write}l_relaxed, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk.h>
134 #include <linux/clk-provider.h>
135 #include <linux/delay.h>
136 #include <linux/err.h>
137 #include <linux/list.h>
138 #include <linux/mutex.h>
139 #include <linux/spinlock.h>
140 #include <linux/slab.h>
141 #include <linux/bootmem.h>
142 #include <linux/cpu.h>
143 #include <linux/of.h>
144 #include <linux/of_address.h>
146 #include <asm/system_misc.h>
149 #include "omap_hwmod.h"
153 #include "clockdomain.h"
154 #include "powerdomain.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 * Address offset (in bytes) between the reset control and the reset
177 * status registers: 4 bytes on OMAP4
179 #define OMAP4_RST_CTRL_ST_OFFSET 4
182 * Maximum length for module clock handle names
184 #define MOD_CLK_MAX_NAME_LEN 32
187 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
188 * @enable_module: function to enable a module (via MODULEMODE)
189 * @disable_module: function to disable a module (via MODULEMODE)
191 * XXX Eventually this functionality will be hidden inside the PRM/CM
192 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
193 * conditionals in this code.
195 struct omap_hwmod_soc_ops
{
196 void (*enable_module
)(struct omap_hwmod
*oh
);
197 int (*disable_module
)(struct omap_hwmod
*oh
);
198 int (*wait_target_ready
)(struct omap_hwmod
*oh
);
199 int (*assert_hardreset
)(struct omap_hwmod
*oh
,
200 struct omap_hwmod_rst_info
*ohri
);
201 int (*deassert_hardreset
)(struct omap_hwmod
*oh
,
202 struct omap_hwmod_rst_info
*ohri
);
203 int (*is_hardreset_asserted
)(struct omap_hwmod
*oh
,
204 struct omap_hwmod_rst_info
*ohri
);
205 int (*init_clkdm
)(struct omap_hwmod
*oh
);
206 void (*update_context_lost
)(struct omap_hwmod
*oh
);
207 int (*get_context_lost
)(struct omap_hwmod
*oh
);
208 int (*disable_direct_prcm
)(struct omap_hwmod
*oh
);
211 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
212 static struct omap_hwmod_soc_ops soc_ops
;
214 /* omap_hwmod_list contains all registered struct omap_hwmods */
215 static LIST_HEAD(omap_hwmod_list
);
217 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
218 static struct omap_hwmod
*mpu_oh
;
220 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
221 static DEFINE_SPINLOCK(io_chain_lock
);
224 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
225 * allocated from - used to reduce the number of small memory
226 * allocations, which has a significant impact on performance
228 static struct omap_hwmod_link
*linkspace
;
231 * free_ls, max_ls: array indexes into linkspace; representing the
232 * next free struct omap_hwmod_link index, and the maximum number of
233 * struct omap_hwmod_link records allocated (respectively)
235 static unsigned short free_ls
, max_ls
, ls_supp
;
237 /* inited: set to true once the hwmod code is initialized */
240 /* Private functions */
243 * _fetch_next_ocp_if - return the next OCP interface in a list
244 * @p: ptr to a ptr to the list_head inside the ocp_if to return
245 * @i: pointer to the index of the element pointed to by @p in the list
247 * Return a pointer to the struct omap_hwmod_ocp_if record
248 * containing the struct list_head pointed to by @p, and increment
249 * @p such that a future call to this routine will return the next
252 static struct omap_hwmod_ocp_if
*_fetch_next_ocp_if(struct list_head
**p
,
255 struct omap_hwmod_ocp_if
*oi
;
257 oi
= list_entry(*p
, struct omap_hwmod_link
, node
)->ocp_if
;
266 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
267 * @oh: struct omap_hwmod *
269 * Load the current value of the hwmod OCP_SYSCONFIG register into the
270 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
271 * OCP_SYSCONFIG register or 0 upon success.
273 static int _update_sysc_cache(struct omap_hwmod
*oh
)
275 if (!oh
->class->sysc
) {
276 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
280 /* XXX ensure module interface clock is up */
282 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
284 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
285 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
291 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
292 * @v: OCP_SYSCONFIG value to write
293 * @oh: struct omap_hwmod *
295 * Write @v into the module class' OCP_SYSCONFIG register, if it has
296 * one. No return value.
298 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
300 if (!oh
->class->sysc
) {
301 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
305 /* XXX ensure module interface clock is up */
307 /* Module might have lost context, always update cache and register */
311 * Some IP blocks (such as RTC) require unlocking of IP before
312 * accessing its registers. If a function pointer is present
313 * to unlock, then call it before accessing sysconfig and
314 * call lock after writing sysconfig.
316 if (oh
->class->unlock
)
317 oh
->class->unlock(oh
);
319 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
326 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
327 * @oh: struct omap_hwmod *
328 * @standbymode: MIDLEMODE field bits
329 * @v: pointer to register contents to modify
331 * Update the master standby mode bits in @v to be @standbymode for
332 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
333 * upon error or 0 upon success.
335 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
341 if (!oh
->class->sysc
||
342 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
345 if (!oh
->class->sysc
->sysc_fields
) {
346 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
350 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
351 mstandby_mask
= (0x3 << mstandby_shift
);
353 *v
&= ~mstandby_mask
;
354 *v
|= __ffs(standbymode
) << mstandby_shift
;
360 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
361 * @oh: struct omap_hwmod *
362 * @idlemode: SIDLEMODE field bits
363 * @v: pointer to register contents to modify
365 * Update the slave idle mode bits in @v to be @idlemode for the @oh
366 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
369 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
374 if (!oh
->class->sysc
||
375 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
378 if (!oh
->class->sysc
->sysc_fields
) {
379 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
383 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
384 sidle_mask
= (0x3 << sidle_shift
);
387 *v
|= __ffs(idlemode
) << sidle_shift
;
393 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
394 * @oh: struct omap_hwmod *
395 * @clockact: CLOCKACTIVITY field bits
396 * @v: pointer to register contents to modify
398 * Update the clockactivity mode bits in @v to be @clockact for the
399 * @oh hwmod. Used for additional powersaving on some modules. Does
400 * not write to the hardware. Returns -EINVAL upon error or 0 upon
403 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
408 if (!oh
->class->sysc
||
409 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
412 if (!oh
->class->sysc
->sysc_fields
) {
413 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
417 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
418 clkact_mask
= (0x3 << clkact_shift
);
421 *v
|= clockact
<< clkact_shift
;
427 * _set_softreset: set OCP_SYSCONFIG.SOFTRESET bit in @v
428 * @oh: struct omap_hwmod *
429 * @v: pointer to register contents to modify
431 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
432 * error or 0 upon success.
434 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
438 if (!oh
->class->sysc
||
439 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
442 if (!oh
->class->sysc
->sysc_fields
) {
443 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
447 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
455 * _clear_softreset: clear OCP_SYSCONFIG.SOFTRESET bit in @v
456 * @oh: struct omap_hwmod *
457 * @v: pointer to register contents to modify
459 * Clear the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
460 * error or 0 upon success.
462 static int _clear_softreset(struct omap_hwmod
*oh
, u32
*v
)
466 if (!oh
->class->sysc
||
467 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
470 if (!oh
->class->sysc
->sysc_fields
) {
472 "omap_hwmod: %s: sysc_fields absent for sysconfig class\n",
477 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
485 * _wait_softreset_complete - wait for an OCP softreset to complete
486 * @oh: struct omap_hwmod * to wait on
488 * Wait until the IP block represented by @oh reports that its OCP
489 * softreset is complete. This can be triggered by software (see
490 * _ocp_softreset()) or by hardware upon returning from off-mode (one
491 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
492 * microseconds. Returns the number of microseconds waited.
494 static int _wait_softreset_complete(struct omap_hwmod
*oh
)
496 struct omap_hwmod_class_sysconfig
*sysc
;
500 sysc
= oh
->class->sysc
;
502 if (sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
503 omap_test_timeout((omap_hwmod_read(oh
, sysc
->syss_offs
)
504 & SYSS_RESETDONE_MASK
),
505 MAX_MODULE_SOFTRESET_WAIT
, c
);
506 else if (sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
) {
507 softrst_mask
= (0x1 << sysc
->sysc_fields
->srst_shift
);
508 omap_test_timeout(!(omap_hwmod_read(oh
, sysc
->sysc_offs
)
510 MAX_MODULE_SOFTRESET_WAIT
, c
);
517 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
518 * @oh: struct omap_hwmod *
520 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
521 * of some modules. When the DMA must perform read/write accesses, the
522 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
523 * for power management, software must set the DMADISABLE bit back to 1.
525 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
526 * error or 0 upon success.
528 static int _set_dmadisable(struct omap_hwmod
*oh
)
533 if (!oh
->class->sysc
||
534 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_DMADISABLE
))
537 if (!oh
->class->sysc
->sysc_fields
) {
538 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
542 /* clocks must be on for this operation */
543 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
544 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh
->name
);
548 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh
->name
);
552 (0x1 << oh
->class->sysc
->sysc_fields
->dmadisable_shift
);
553 v
|= dmadisable_mask
;
554 _write_sysconfig(v
, oh
);
560 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
561 * @oh: struct omap_hwmod *
562 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
563 * @v: pointer to register contents to modify
565 * Update the module autoidle bit in @v to be @autoidle for the @oh
566 * hwmod. The autoidle bit controls whether the module can gate
567 * internal clocks automatically when it isn't doing anything; the
568 * exact function of this bit varies on a per-module basis. This
569 * function does not write to the hardware. Returns -EINVAL upon
570 * error or 0 upon success.
572 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
578 if (!oh
->class->sysc
||
579 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
582 if (!oh
->class->sysc
->sysc_fields
) {
583 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
587 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
588 autoidle_mask
= (0x1 << autoidle_shift
);
590 *v
&= ~autoidle_mask
;
591 *v
|= autoidle
<< autoidle_shift
;
597 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
598 * @oh: struct omap_hwmod *
599 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
601 * Set or clear the I/O pad wakeup flag in the mux entries for the
602 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
603 * in memory. If the hwmod is currently idled, and the new idle
604 * values don't match the previous ones, this function will also
605 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
606 * currently idled, this function won't touch the hardware: the new
607 * mux settings are written to the SCM PADCTRL registers when the
608 * hwmod is idled. No return value.
610 static void _set_idle_ioring_wakeup(struct omap_hwmod
*oh
, bool set_wake
)
612 struct omap_device_pad
*pad
;
617 if (!oh
->mux
|| !oh
->mux
->enabled
)
620 for (j
= 0; j
< oh
->mux
->nr_pads_dynamic
; j
++) {
621 pad
= oh
->mux
->pads_dynamic
[j
];
623 if (!(pad
->flags
& OMAP_DEVICE_PAD_WAKEUP
))
626 prev_idle
= pad
->idle
;
629 pad
->idle
|= OMAP_WAKEUP_EN
;
631 pad
->idle
&= ~OMAP_WAKEUP_EN
;
633 if (prev_idle
!= pad
->idle
)
637 if (change
&& oh
->_state
== _HWMOD_STATE_IDLE
)
638 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
642 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
643 * @oh: struct omap_hwmod *
645 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
646 * upon error or 0 upon success.
648 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
650 if (!oh
->class->sysc
||
651 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
652 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
653 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
656 if (!oh
->class->sysc
->sysc_fields
) {
657 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
661 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
662 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
664 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
665 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
666 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
667 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
669 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
675 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
676 * @oh: struct omap_hwmod *
678 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
679 * upon error or 0 upon success.
681 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
683 if (!oh
->class->sysc
||
684 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
685 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
686 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
689 if (!oh
->class->sysc
->sysc_fields
) {
690 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
694 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
695 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
697 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
698 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
699 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
700 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART
, v
);
702 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
707 static struct clockdomain
*_get_clkdm(struct omap_hwmod
*oh
)
709 struct clk_hw_omap
*clk
;
713 } else if (oh
->_clk
) {
714 if (__clk_get_flags(oh
->_clk
) & CLK_IS_BASIC
)
716 clk
= to_clk_hw_omap(__clk_get_hw(oh
->_clk
));
723 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
724 * @oh: struct omap_hwmod *
726 * Prevent the hardware module @oh from entering idle while the
727 * hardare module initiator @init_oh is active. Useful when a module
728 * will be accessed by a particular initiator (e.g., if a module will
729 * be accessed by the IVA, there should be a sleepdep between the IVA
730 * initiator and the module). Only applies to modules in smart-idle
731 * mode. If the clockdomain is marked as not needing autodeps, return
732 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
733 * passes along clkdm_add_sleepdep() value upon success.
735 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
737 struct clockdomain
*clkdm
, *init_clkdm
;
739 clkdm
= _get_clkdm(oh
);
740 init_clkdm
= _get_clkdm(init_oh
);
742 if (!clkdm
|| !init_clkdm
)
745 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
748 return clkdm_add_sleepdep(clkdm
, init_clkdm
);
752 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
753 * @oh: struct omap_hwmod *
755 * Allow the hardware module @oh to enter idle while the hardare
756 * module initiator @init_oh is active. Useful when a module will not
757 * be accessed by a particular initiator (e.g., if a module will not
758 * be accessed by the IVA, there should be no sleepdep between the IVA
759 * initiator and the module). Only applies to modules in smart-idle
760 * mode. If the clockdomain is marked as not needing autodeps, return
761 * 0 without doing anything. Returns -EINVAL upon error or passes
762 * along clkdm_del_sleepdep() value upon success.
764 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
766 struct clockdomain
*clkdm
, *init_clkdm
;
768 clkdm
= _get_clkdm(oh
);
769 init_clkdm
= _get_clkdm(init_oh
);
771 if (!clkdm
|| !init_clkdm
)
774 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
777 return clkdm_del_sleepdep(clkdm
, init_clkdm
);
781 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
782 * @oh: struct omap_hwmod *
784 * Called from _init_clocks(). Populates the @oh _clk (main
785 * functional clock pointer) if a clock matching the hwmod name is found,
786 * or a main_clk is present. Returns 0 on success or -EINVAL on error.
788 static int _init_main_clk(struct omap_hwmod
*oh
)
791 char name
[MOD_CLK_MAX_NAME_LEN
];
794 /* +7 magic comes from '_mod_ck' suffix */
795 if (strlen(oh
->name
) + 7 > MOD_CLK_MAX_NAME_LEN
)
796 pr_warn("%s: warning: cropping name for %s\n", __func__
,
799 strncpy(name
, oh
->name
, MOD_CLK_MAX_NAME_LEN
- 7);
800 strcat(name
, "_mod_ck");
802 clk
= clk_get(NULL
, name
);
805 soc_ops
.disable_direct_prcm(oh
);
806 oh
->main_clk
= kstrdup(name
, GFP_KERNEL
);
811 oh
->_clk
= clk_get(NULL
, oh
->main_clk
);
814 if (IS_ERR(oh
->_clk
)) {
815 pr_warn("omap_hwmod: %s: cannot clk_get main_clk %s\n",
816 oh
->name
, oh
->main_clk
);
820 * HACK: This needs a re-visit once clk_prepare() is implemented
821 * to do something meaningful. Today its just a no-op.
822 * If clk_prepare() is used at some point to do things like
823 * voltage scaling etc, then this would have to be moved to
824 * some point where subsystems like i2c and pmic become
827 clk_prepare(oh
->_clk
);
830 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
831 oh
->name
, oh
->main_clk
);
837 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
838 * @oh: struct omap_hwmod *
840 * Called from _init_clocks(). Populates the @oh OCP slave interface
841 * clock pointers. Returns 0 on success or -EINVAL on error.
843 static int _init_interface_clks(struct omap_hwmod
*oh
)
845 struct omap_hwmod_ocp_if
*os
;
851 p
= oh
->slave_ports
.next
;
853 while (i
< oh
->slaves_cnt
) {
854 os
= _fetch_next_ocp_if(&p
, &i
);
858 c
= clk_get(NULL
, os
->clk
);
860 pr_warn("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
867 * HACK: This needs a re-visit once clk_prepare() is implemented
868 * to do something meaningful. Today its just a no-op.
869 * If clk_prepare() is used at some point to do things like
870 * voltage scaling etc, then this would have to be moved to
871 * some point where subsystems like i2c and pmic become
874 clk_prepare(os
->_clk
);
881 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
882 * @oh: struct omap_hwmod *
884 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
885 * clock pointers. Returns 0 on success or -EINVAL on error.
887 static int _init_opt_clks(struct omap_hwmod
*oh
)
889 struct omap_hwmod_opt_clk
*oc
;
894 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
895 c
= clk_get(NULL
, oc
->clk
);
897 pr_warn("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
904 * HACK: This needs a re-visit once clk_prepare() is implemented
905 * to do something meaningful. Today its just a no-op.
906 * If clk_prepare() is used at some point to do things like
907 * voltage scaling etc, then this would have to be moved to
908 * some point where subsystems like i2c and pmic become
911 clk_prepare(oc
->_clk
);
917 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
919 struct omap_hwmod_opt_clk
*oc
;
922 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
924 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
926 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
927 __clk_get_name(oc
->_clk
));
928 clk_enable(oc
->_clk
);
932 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
934 struct omap_hwmod_opt_clk
*oc
;
937 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
939 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
941 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
942 __clk_get_name(oc
->_clk
));
943 clk_disable(oc
->_clk
);
948 * _enable_clocks - enable hwmod main clock and interface clocks
949 * @oh: struct omap_hwmod *
951 * Enables all clocks necessary for register reads and writes to succeed
952 * on the hwmod @oh. Returns 0.
954 static int _enable_clocks(struct omap_hwmod
*oh
)
956 struct omap_hwmod_ocp_if
*os
;
960 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
963 clk_enable(oh
->_clk
);
965 p
= oh
->slave_ports
.next
;
967 while (i
< oh
->slaves_cnt
) {
968 os
= _fetch_next_ocp_if(&p
, &i
);
970 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
971 clk_enable(os
->_clk
);
974 if (oh
->flags
& HWMOD_OPT_CLKS_NEEDED
)
975 _enable_optional_clocks(oh
);
977 /* The opt clocks are controlled by the device driver. */
983 * _disable_clocks - disable hwmod main clock and interface clocks
984 * @oh: struct omap_hwmod *
986 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
988 static int _disable_clocks(struct omap_hwmod
*oh
)
990 struct omap_hwmod_ocp_if
*os
;
994 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
997 clk_disable(oh
->_clk
);
999 p
= oh
->slave_ports
.next
;
1001 while (i
< oh
->slaves_cnt
) {
1002 os
= _fetch_next_ocp_if(&p
, &i
);
1004 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
1005 clk_disable(os
->_clk
);
1008 if (oh
->flags
& HWMOD_OPT_CLKS_NEEDED
)
1009 _disable_optional_clocks(oh
);
1011 /* The opt clocks are controlled by the device driver. */
1017 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
1018 * @oh: struct omap_hwmod *
1020 * Enables the PRCM module mode related to the hwmod @oh.
1023 static void _omap4_enable_module(struct omap_hwmod
*oh
)
1025 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1028 pr_debug("omap_hwmod: %s: %s: %d\n",
1029 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
1031 omap_cm_module_enable(oh
->prcm
.omap4
.modulemode
,
1032 oh
->clkdm
->prcm_partition
,
1033 oh
->clkdm
->cm_inst
, oh
->prcm
.omap4
.clkctrl_offs
);
1037 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
1038 * @oh: struct omap_hwmod *
1040 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1041 * does not have an IDLEST bit or if the module successfully enters
1042 * slave idle; otherwise, pass along the return value of the
1043 * appropriate *_cm*_wait_module_idle() function.
1045 static int _omap4_wait_target_disable(struct omap_hwmod
*oh
)
1050 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| !oh
->clkdm
)
1053 if (oh
->flags
& HWMOD_NO_IDLEST
)
1056 return omap_cm_wait_module_idle(oh
->clkdm
->prcm_partition
,
1058 oh
->prcm
.omap4
.clkctrl_offs
, 0);
1062 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1063 * @oh: struct omap_hwmod *oh
1065 * Count and return the number of MPU IRQs associated with the hwmod
1066 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1069 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
1071 struct omap_hwmod_irq_info
*ohii
;
1074 if (!oh
|| !oh
->mpu_irqs
)
1078 ohii
= &oh
->mpu_irqs
[i
++];
1079 } while (ohii
->irq
!= -1);
1085 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1086 * @oh: struct omap_hwmod *oh
1088 * Count and return the number of SDMA request lines associated with
1089 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1092 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
1094 struct omap_hwmod_dma_info
*ohdi
;
1097 if (!oh
|| !oh
->sdma_reqs
)
1101 ohdi
= &oh
->sdma_reqs
[i
++];
1102 } while (ohdi
->dma_req
!= -1);
1108 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1109 * @oh: struct omap_hwmod *oh
1111 * Count and return the number of address space ranges associated with
1112 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1115 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
1117 struct omap_hwmod_addr_space
*mem
;
1120 if (!os
|| !os
->addr
)
1124 mem
= &os
->addr
[i
++];
1125 } while (mem
->pa_start
!= mem
->pa_end
);
1131 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1132 * @oh: struct omap_hwmod * to operate on
1133 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1134 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1136 * Retrieve a MPU hardware IRQ line number named by @name associated
1137 * with the IP block pointed to by @oh. The IRQ number will be filled
1138 * into the address pointed to by @dma. When @name is non-null, the
1139 * IRQ line number associated with the named entry will be returned.
1140 * If @name is null, the first matching entry will be returned. Data
1141 * order is not meaningful in hwmod data, so callers are strongly
1142 * encouraged to use a non-null @name whenever possible to avoid
1143 * unpredictable effects if hwmod data is later added that causes data
1144 * ordering to change. Returns 0 upon success or a negative error
1147 static int _get_mpu_irq_by_name(struct omap_hwmod
*oh
, const char *name
,
1157 while (oh
->mpu_irqs
[i
].irq
!= -1) {
1158 if (name
== oh
->mpu_irqs
[i
].name
||
1159 !strcmp(name
, oh
->mpu_irqs
[i
].name
)) {
1169 *irq
= oh
->mpu_irqs
[i
].irq
;
1175 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1176 * @oh: struct omap_hwmod * to operate on
1177 * @name: pointer to the name of the SDMA request line to fetch (optional)
1178 * @dma: pointer to an unsigned int to store the request line ID to
1180 * Retrieve an SDMA request line ID named by @name on the IP block
1181 * pointed to by @oh. The ID will be filled into the address pointed
1182 * to by @dma. When @name is non-null, the request line ID associated
1183 * with the named entry will be returned. If @name is null, the first
1184 * matching entry will be returned. Data order is not meaningful in
1185 * hwmod data, so callers are strongly encouraged to use a non-null
1186 * @name whenever possible to avoid unpredictable effects if hwmod
1187 * data is later added that causes data ordering to change. Returns 0
1188 * upon success or a negative error code upon error.
1190 static int _get_sdma_req_by_name(struct omap_hwmod
*oh
, const char *name
,
1200 while (oh
->sdma_reqs
[i
].dma_req
!= -1) {
1201 if (name
== oh
->sdma_reqs
[i
].name
||
1202 !strcmp(name
, oh
->sdma_reqs
[i
].name
)) {
1212 *dma
= oh
->sdma_reqs
[i
].dma_req
;
1218 * _get_addr_space_by_name - fetch address space start & end by name
1219 * @oh: struct omap_hwmod * to operate on
1220 * @name: pointer to the name of the address space to fetch (optional)
1221 * @pa_start: pointer to a u32 to store the starting address to
1222 * @pa_end: pointer to a u32 to store the ending address to
1224 * Retrieve address space start and end addresses for the IP block
1225 * pointed to by @oh. The data will be filled into the addresses
1226 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1227 * address space data associated with the named entry will be
1228 * returned. If @name is null, the first matching entry will be
1229 * returned. Data order is not meaningful in hwmod data, so callers
1230 * are strongly encouraged to use a non-null @name whenever possible
1231 * to avoid unpredictable effects if hwmod data is later added that
1232 * causes data ordering to change. Returns 0 upon success or a
1233 * negative error code upon error.
1235 static int _get_addr_space_by_name(struct omap_hwmod
*oh
, const char *name
,
1236 u32
*pa_start
, u32
*pa_end
)
1239 struct omap_hwmod_ocp_if
*os
;
1240 struct list_head
*p
= NULL
;
1243 p
= oh
->slave_ports
.next
;
1246 while (i
< oh
->slaves_cnt
) {
1247 os
= _fetch_next_ocp_if(&p
, &i
);
1253 while (os
->addr
[j
].pa_start
!= os
->addr
[j
].pa_end
) {
1254 if (name
== os
->addr
[j
].name
||
1255 !strcmp(name
, os
->addr
[j
].name
)) {
1269 *pa_start
= os
->addr
[j
].pa_start
;
1270 *pa_end
= os
->addr
[j
].pa_end
;
1276 * _save_mpu_port_index - find and save the index to @oh's MPU port
1277 * @oh: struct omap_hwmod *
1279 * Determines the array index of the OCP slave port that the MPU uses
1280 * to address the device, and saves it into the struct omap_hwmod.
1281 * Intended to be called during hwmod registration only. No return
1284 static void __init
_save_mpu_port_index(struct omap_hwmod
*oh
)
1286 struct omap_hwmod_ocp_if
*os
= NULL
;
1287 struct list_head
*p
;
1293 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1295 p
= oh
->slave_ports
.next
;
1297 while (i
< oh
->slaves_cnt
) {
1298 os
= _fetch_next_ocp_if(&p
, &i
);
1299 if (os
->user
& OCP_USER_MPU
) {
1301 oh
->_int_flags
&= ~_HWMOD_NO_MPU_PORT
;
1310 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1311 * @oh: struct omap_hwmod *
1313 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1314 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1315 * communicate with the IP block. This interface need not be directly
1316 * connected to the MPU (and almost certainly is not), but is directly
1317 * connected to the IP block represented by @oh. Returns a pointer
1318 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1319 * error or if there does not appear to be a path from the MPU to this
1322 static struct omap_hwmod_ocp_if
*_find_mpu_rt_port(struct omap_hwmod
*oh
)
1324 if (!oh
|| oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| oh
->slaves_cnt
== 0)
1327 return oh
->_mpu_port
;
1331 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1332 * @oh: struct omap_hwmod *
1334 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1335 * the register target MPU address space; or returns NULL upon error.
1337 static struct omap_hwmod_addr_space
* __init
_find_mpu_rt_addr_space(struct omap_hwmod
*oh
)
1339 struct omap_hwmod_ocp_if
*os
;
1340 struct omap_hwmod_addr_space
*mem
;
1341 int found
= 0, i
= 0;
1343 os
= _find_mpu_rt_port(oh
);
1344 if (!os
|| !os
->addr
)
1348 mem
= &os
->addr
[i
++];
1349 if (mem
->flags
& ADDR_TYPE_RT
)
1351 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
1353 return (found
) ? mem
: NULL
;
1357 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1358 * @oh: struct omap_hwmod *
1360 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1361 * by @oh is set to indicate to the PRCM that the IP block is active.
1362 * Usually this means placing the module into smart-idle mode and
1363 * smart-standby, but if there is a bug in the automatic idle handling
1364 * for the IP block, it may need to be placed into the force-idle or
1365 * no-idle variants of these modes. No return value.
1367 static void _enable_sysc(struct omap_hwmod
*oh
)
1372 struct clockdomain
*clkdm
;
1374 if (!oh
->class->sysc
)
1378 * Wait until reset has completed, this is needed as the IP
1379 * block is reset automatically by hardware in some cases
1380 * (off-mode for example), and the drivers require the
1381 * IP to be ready when they access it
1383 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1384 _enable_optional_clocks(oh
);
1385 _wait_softreset_complete(oh
);
1386 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1387 _disable_optional_clocks(oh
);
1389 v
= oh
->_sysc_cache
;
1390 sf
= oh
->class->sysc
->sysc_flags
;
1392 clkdm
= _get_clkdm(oh
);
1393 if (sf
& SYSC_HAS_SIDLEMODE
) {
1394 if (oh
->flags
& HWMOD_SWSUP_SIDLE
||
1395 oh
->flags
& HWMOD_SWSUP_SIDLE_ACT
) {
1396 idlemode
= HWMOD_IDLEMODE_NO
;
1398 if (sf
& SYSC_HAS_ENAWAKEUP
)
1399 _enable_wakeup(oh
, &v
);
1400 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
1401 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1403 idlemode
= HWMOD_IDLEMODE_SMART
;
1407 * This is special handling for some IPs like
1408 * 32k sync timer. Force them to idle!
1410 clkdm_act
= (clkdm
&& clkdm
->flags
& CLKDM_ACTIVE_WITH_MPU
);
1411 if (clkdm_act
&& !(oh
->class->sysc
->idlemodes
&
1412 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1413 idlemode
= HWMOD_IDLEMODE_FORCE
;
1415 _set_slave_idlemode(oh
, idlemode
, &v
);
1418 if (sf
& SYSC_HAS_MIDLEMODE
) {
1419 if (oh
->flags
& HWMOD_FORCE_MSTANDBY
) {
1420 idlemode
= HWMOD_IDLEMODE_FORCE
;
1421 } else if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1422 idlemode
= HWMOD_IDLEMODE_NO
;
1424 if (sf
& SYSC_HAS_ENAWAKEUP
)
1425 _enable_wakeup(oh
, &v
);
1426 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1427 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1429 idlemode
= HWMOD_IDLEMODE_SMART
;
1431 _set_master_standbymode(oh
, idlemode
, &v
);
1435 * XXX The clock framework should handle this, by
1436 * calling into this code. But this must wait until the
1437 * clock structures are tagged with omap_hwmod entries
1439 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
1440 (sf
& SYSC_HAS_CLOCKACTIVITY
))
1441 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
1443 _write_sysconfig(v
, oh
);
1446 * Set the autoidle bit only after setting the smartidle bit
1447 * Setting this will not have any impact on the other modules.
1449 if (sf
& SYSC_HAS_AUTOIDLE
) {
1450 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
1452 _set_module_autoidle(oh
, idlemode
, &v
);
1453 _write_sysconfig(v
, oh
);
1458 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1459 * @oh: struct omap_hwmod *
1461 * If module is marked as SWSUP_SIDLE, force the module into slave
1462 * idle; otherwise, configure it for smart-idle. If module is marked
1463 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1464 * configure it for smart-standby. No return value.
1466 static void _idle_sysc(struct omap_hwmod
*oh
)
1471 if (!oh
->class->sysc
)
1474 v
= oh
->_sysc_cache
;
1475 sf
= oh
->class->sysc
->sysc_flags
;
1477 if (sf
& SYSC_HAS_SIDLEMODE
) {
1478 if (oh
->flags
& HWMOD_SWSUP_SIDLE
) {
1479 idlemode
= HWMOD_IDLEMODE_FORCE
;
1481 if (sf
& SYSC_HAS_ENAWAKEUP
)
1482 _enable_wakeup(oh
, &v
);
1483 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
1484 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1486 idlemode
= HWMOD_IDLEMODE_SMART
;
1488 _set_slave_idlemode(oh
, idlemode
, &v
);
1491 if (sf
& SYSC_HAS_MIDLEMODE
) {
1492 if ((oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ||
1493 (oh
->flags
& HWMOD_FORCE_MSTANDBY
)) {
1494 idlemode
= HWMOD_IDLEMODE_FORCE
;
1496 if (sf
& SYSC_HAS_ENAWAKEUP
)
1497 _enable_wakeup(oh
, &v
);
1498 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1499 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1501 idlemode
= HWMOD_IDLEMODE_SMART
;
1503 _set_master_standbymode(oh
, idlemode
, &v
);
1506 /* If the cached value is the same as the new value, skip the write */
1507 if (oh
->_sysc_cache
!= v
)
1508 _write_sysconfig(v
, oh
);
1512 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1513 * @oh: struct omap_hwmod *
1515 * Force the module into slave idle and master suspend. No return
1518 static void _shutdown_sysc(struct omap_hwmod
*oh
)
1523 if (!oh
->class->sysc
)
1526 v
= oh
->_sysc_cache
;
1527 sf
= oh
->class->sysc
->sysc_flags
;
1529 if (sf
& SYSC_HAS_SIDLEMODE
)
1530 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1532 if (sf
& SYSC_HAS_MIDLEMODE
)
1533 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1535 if (sf
& SYSC_HAS_AUTOIDLE
)
1536 _set_module_autoidle(oh
, 1, &v
);
1538 _write_sysconfig(v
, oh
);
1542 * _lookup - find an omap_hwmod by name
1543 * @name: find an omap_hwmod by name
1545 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1547 static struct omap_hwmod
*_lookup(const char *name
)
1549 struct omap_hwmod
*oh
, *temp_oh
;
1553 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1554 if (!strcmp(name
, temp_oh
->name
)) {
1564 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1565 * @oh: struct omap_hwmod *
1567 * Convert a clockdomain name stored in a struct omap_hwmod into a
1568 * clockdomain pointer, and save it into the struct omap_hwmod.
1569 * Return -EINVAL if the clkdm_name lookup failed.
1571 static int _init_clkdm(struct omap_hwmod
*oh
)
1573 if (!oh
->clkdm_name
) {
1574 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh
->name
);
1578 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1580 pr_warn("omap_hwmod: %s: could not associate to clkdm %s\n",
1581 oh
->name
, oh
->clkdm_name
);
1585 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1586 oh
->name
, oh
->clkdm_name
);
1592 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1593 * well the clockdomain.
1594 * @oh: struct omap_hwmod *
1595 * @data: not used; pass NULL
1597 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1598 * Resolves all clock names embedded in the hwmod. Returns 0 on
1599 * success, or a negative error code on failure.
1601 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1605 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1608 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1610 if (soc_ops
.init_clkdm
)
1611 ret
|= soc_ops
.init_clkdm(oh
);
1613 ret
|= _init_main_clk(oh
);
1614 ret
|= _init_interface_clks(oh
);
1615 ret
|= _init_opt_clks(oh
);
1618 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1620 pr_warn("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1626 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1627 * @oh: struct omap_hwmod *
1628 * @name: name of the reset line in the context of this hwmod
1629 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1631 * Return the bit position of the reset line that match the
1632 * input name. Return -ENOENT if not found.
1634 static int _lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1635 struct omap_hwmod_rst_info
*ohri
)
1639 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1640 const char *rst_line
= oh
->rst_lines
[i
].name
;
1641 if (!strcmp(rst_line
, name
)) {
1642 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1643 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1644 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1645 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1656 * _assert_hardreset - assert the HW reset line of submodules
1657 * contained in the hwmod module.
1658 * @oh: struct omap_hwmod *
1659 * @name: name of the reset line to lookup and assert
1661 * Some IP like dsp, ipu or iva contain processor that require an HW
1662 * reset line to be assert / deassert in order to enable fully the IP.
1663 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1664 * asserting the hardreset line on the currently-booted SoC, or passes
1665 * along the return value from _lookup_hardreset() or the SoC's
1666 * assert_hardreset code.
1668 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1670 struct omap_hwmod_rst_info ohri
;
1676 if (!soc_ops
.assert_hardreset
)
1679 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1683 ret
= soc_ops
.assert_hardreset(oh
, &ohri
);
1689 * _deassert_hardreset - deassert the HW reset line of submodules contained
1690 * in the hwmod module.
1691 * @oh: struct omap_hwmod *
1692 * @name: name of the reset line to look up and deassert
1694 * Some IP like dsp, ipu or iva contain processor that require an HW
1695 * reset line to be assert / deassert in order to enable fully the IP.
1696 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1697 * deasserting the hardreset line on the currently-booted SoC, or passes
1698 * along the return value from _lookup_hardreset() or the SoC's
1699 * deassert_hardreset code.
1701 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1703 struct omap_hwmod_rst_info ohri
;
1709 if (!soc_ops
.deassert_hardreset
)
1712 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1718 * A clockdomain must be in SW_SUP otherwise reset
1719 * might not be completed. The clockdomain can be set
1720 * in HW_AUTO only when the module become ready.
1722 clkdm_deny_idle(oh
->clkdm
);
1723 ret
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
1725 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1726 oh
->name
, oh
->clkdm
->name
, ret
);
1732 if (soc_ops
.enable_module
)
1733 soc_ops
.enable_module(oh
);
1735 ret
= soc_ops
.deassert_hardreset(oh
, &ohri
);
1737 if (soc_ops
.disable_module
)
1738 soc_ops
.disable_module(oh
);
1739 _disable_clocks(oh
);
1742 pr_warn("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1746 * Set the clockdomain to HW_AUTO, assuming that the
1747 * previous state was HW_AUTO.
1749 clkdm_allow_idle(oh
->clkdm
);
1751 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1758 * _read_hardreset - read the HW reset line state of submodules
1759 * contained in the hwmod module
1760 * @oh: struct omap_hwmod *
1761 * @name: name of the reset line to look up and read
1763 * Return the state of the reset line. Returns -EINVAL if @oh is
1764 * null, -ENOSYS if we have no way of reading the hardreset line
1765 * status on the currently-booted SoC, or passes along the return
1766 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1769 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1771 struct omap_hwmod_rst_info ohri
;
1777 if (!soc_ops
.is_hardreset_asserted
)
1780 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1784 return soc_ops
.is_hardreset_asserted(oh
, &ohri
);
1788 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1789 * @oh: struct omap_hwmod *
1791 * If all hardreset lines associated with @oh are asserted, then return true.
1792 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1793 * associated with @oh are asserted, then return false.
1794 * This function is used to avoid executing some parts of the IP block
1795 * enable/disable sequence if its hardreset line is set.
1797 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1801 if (oh
->rst_lines_cnt
== 0)
1804 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1805 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1808 if (oh
->rst_lines_cnt
== rst_cnt
)
1815 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1817 * @oh: struct omap_hwmod *
1819 * If any hardreset lines associated with @oh are asserted, then
1820 * return true. Otherwise, if no hardreset lines associated with @oh
1821 * are asserted, or if @oh has no hardreset lines, then return false.
1822 * This function is used to avoid executing some parts of the IP block
1823 * enable/disable sequence if any hardreset line is set.
1825 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1830 for (i
= 0; i
< oh
->rst_lines_cnt
&& rst_cnt
== 0; i
++)
1831 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1834 return (rst_cnt
) ? true : false;
1838 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1839 * @oh: struct omap_hwmod *
1841 * Disable the PRCM module mode related to the hwmod @oh.
1842 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1844 static int _omap4_disable_module(struct omap_hwmod
*oh
)
1848 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1852 * Since integration code might still be doing something, only
1853 * disable if all lines are under hardreset.
1855 if (_are_any_hardreset_lines_asserted(oh
))
1858 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1860 omap_cm_module_disable(oh
->clkdm
->prcm_partition
, oh
->clkdm
->cm_inst
,
1861 oh
->prcm
.omap4
.clkctrl_offs
);
1863 v
= _omap4_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
);
1915 _write_sysconfig(v
, oh
);
1917 if (oh
->class->sysc
->srst_udelay
)
1918 udelay(oh
->class->sysc
->srst_udelay
);
1920 c
= _wait_softreset_complete(oh
);
1921 if (c
== MAX_MODULE_SOFTRESET_WAIT
) {
1922 pr_warn("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1923 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1927 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1930 ret
= _clear_softreset(oh
, &v
);
1934 _write_sysconfig(v
, oh
);
1937 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1938 * _wait_target_ready() or _reset()
1942 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1943 _disable_optional_clocks(oh
);
1949 * _reset - reset an omap_hwmod
1950 * @oh: struct omap_hwmod *
1952 * Resets an omap_hwmod @oh. If the module has a custom reset
1953 * function pointer defined, then call it to reset the IP block, and
1954 * pass along its return value to the caller. Otherwise, if the IP
1955 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1956 * associated with it, call a function to reset the IP block via that
1957 * method, and pass along the return value to the caller. Finally, if
1958 * the IP block has some hardreset lines associated with it, assert
1959 * all of those, but do _not_ deassert them. (This is because driver
1960 * authors have expressed an apparent requirement to control the
1961 * deassertion of the hardreset lines themselves.)
1963 * The default software reset mechanism for most OMAP IP blocks is
1964 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1965 * hwmods cannot be reset via this method. Some are not targets and
1966 * therefore have no OCP header registers to access. Others (like the
1967 * IVA) have idiosyncratic reset sequences. So for these relatively
1968 * rare cases, custom reset code can be supplied in the struct
1969 * omap_hwmod_class .reset function pointer.
1971 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1972 * does not prevent idling of the system. This is necessary for cases
1973 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1974 * kernel without disabling dma.
1976 * Passes along the return value from either _ocp_softreset() or the
1977 * custom reset function - these must return -EINVAL if the hwmod
1978 * cannot be reset this way or if the hwmod is in the wrong state,
1979 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1981 static int _reset(struct omap_hwmod
*oh
)
1985 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1987 if (oh
->class->reset
) {
1988 r
= oh
->class->reset(oh
);
1990 if (oh
->rst_lines_cnt
> 0) {
1991 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1992 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
1995 r
= _ocp_softreset(oh
);
2001 _set_dmadisable(oh
);
2004 * OCP_SYSCONFIG bits need to be reprogrammed after a
2005 * softreset. The _enable() function should be split to avoid
2006 * the rewrite of the OCP_SYSCONFIG register.
2008 if (oh
->class->sysc
) {
2009 _update_sysc_cache(oh
);
2017 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
2019 * Call the appropriate PRM function to clear any logged I/O chain
2020 * wakeups and to reconfigure the chain. This apparently needs to be
2021 * done upon every mux change. Since hwmods can be concurrently
2022 * enabled and idled, hold a spinlock around the I/O chain
2023 * reconfiguration sequence. No return value.
2025 * XXX When the PRM code is moved to drivers, this function can be removed,
2026 * as the PRM infrastructure should abstract this.
2028 static void _reconfigure_io_chain(void)
2030 unsigned long flags
;
2032 spin_lock_irqsave(&io_chain_lock
, flags
);
2034 omap_prm_reconfigure_io_chain();
2036 spin_unlock_irqrestore(&io_chain_lock
, flags
);
2040 * _omap4_update_context_lost - increment hwmod context loss counter if
2041 * hwmod context was lost, and clear hardware context loss reg
2042 * @oh: hwmod to check for context loss
2044 * If the PRCM indicates that the hwmod @oh lost context, increment
2045 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2046 * bits. No return value.
2048 static void _omap4_update_context_lost(struct omap_hwmod
*oh
)
2050 if (oh
->prcm
.omap4
.flags
& HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT
)
2053 if (!prm_was_any_context_lost_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2054 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2055 oh
->prcm
.omap4
.context_offs
))
2058 oh
->prcm
.omap4
.context_lost_counter
++;
2059 prm_clear_context_loss_flags_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2060 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2061 oh
->prcm
.omap4
.context_offs
);
2065 * _omap4_get_context_lost - get context loss counter for a hwmod
2066 * @oh: hwmod to get context loss counter for
2068 * Returns the in-memory context loss counter for a hwmod.
2070 static int _omap4_get_context_lost(struct omap_hwmod
*oh
)
2072 return oh
->prcm
.omap4
.context_lost_counter
;
2076 * _enable_preprogram - Pre-program an IP block during the _enable() process
2077 * @oh: struct omap_hwmod *
2079 * Some IP blocks (such as AESS) require some additional programming
2080 * after enable before they can enter idle. If a function pointer to
2081 * do so is present in the hwmod data, then call it and pass along the
2082 * return value; otherwise, return 0.
2084 static int _enable_preprogram(struct omap_hwmod
*oh
)
2086 if (!oh
->class->enable_preprogram
)
2089 return oh
->class->enable_preprogram(oh
);
2093 * _enable - enable an omap_hwmod
2094 * @oh: struct omap_hwmod *
2096 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2097 * register target. Returns -EINVAL if the hwmod is in the wrong
2098 * state or passes along the return value of _wait_target_ready().
2100 static int _enable(struct omap_hwmod
*oh
)
2104 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
2107 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2108 * state at init. Now that someone is really trying to enable
2109 * them, just ensure that the hwmod mux is set.
2111 if (oh
->_int_flags
& _HWMOD_SKIP_ENABLE
) {
2113 * If the caller has mux data populated, do the mux'ing
2114 * which wouldn't have been done as part of the _enable()
2115 * done during setup.
2118 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2120 oh
->_int_flags
&= ~_HWMOD_SKIP_ENABLE
;
2124 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
2125 oh
->_state
!= _HWMOD_STATE_IDLE
&&
2126 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
2127 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2133 * If an IP block contains HW reset lines and all of them are
2134 * asserted, we let integration code associated with that
2135 * block handle the enable. We've received very little
2136 * information on what those driver authors need, and until
2137 * detailed information is provided and the driver code is
2138 * posted to the public lists, this is probably the best we
2141 if (_are_all_hardreset_lines_asserted(oh
))
2144 /* Mux pins for device runtime if populated */
2145 if (oh
->mux
&& (!oh
->mux
->enabled
||
2146 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
2147 oh
->mux
->pads_dynamic
))) {
2148 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2149 _reconfigure_io_chain();
2150 } else if (oh
->flags
& HWMOD_RECONFIG_IO_CHAIN
) {
2151 _reconfigure_io_chain();
2154 _add_initiator_dep(oh
, mpu_oh
);
2158 * A clockdomain must be in SW_SUP before enabling
2159 * completely the module. The clockdomain can be set
2160 * in HW_AUTO only when the module become ready.
2162 clkdm_deny_idle(oh
->clkdm
);
2163 r
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
2165 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2166 oh
->name
, oh
->clkdm
->name
, r
);
2172 if (soc_ops
.enable_module
)
2173 soc_ops
.enable_module(oh
);
2174 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2175 cpu_idle_poll_ctrl(true);
2177 if (soc_ops
.update_context_lost
)
2178 soc_ops
.update_context_lost(oh
);
2180 r
= (soc_ops
.wait_target_ready
) ? soc_ops
.wait_target_ready(oh
) :
2183 clkdm_allow_idle(oh
->clkdm
);
2186 oh
->_state
= _HWMOD_STATE_ENABLED
;
2188 /* Access the sysconfig only if the target is ready */
2189 if (oh
->class->sysc
) {
2190 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
2191 _update_sysc_cache(oh
);
2194 r
= _enable_preprogram(oh
);
2196 if (soc_ops
.disable_module
)
2197 soc_ops
.disable_module(oh
);
2198 _disable_clocks(oh
);
2199 pr_err("omap_hwmod: %s: _wait_target_ready failed: %d\n",
2203 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2210 * _idle - idle an omap_hwmod
2211 * @oh: struct omap_hwmod *
2213 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2214 * no further work. Returns -EINVAL if the hwmod is in the wrong
2215 * state or returns 0.
2217 static int _idle(struct omap_hwmod
*oh
)
2219 if (oh
->flags
& HWMOD_NO_IDLE
) {
2220 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2224 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
2226 if (_are_all_hardreset_lines_asserted(oh
))
2229 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2230 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2235 if (oh
->class->sysc
)
2237 _del_initiator_dep(oh
, mpu_oh
);
2240 clkdm_deny_idle(oh
->clkdm
);
2242 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2243 cpu_idle_poll_ctrl(false);
2244 if (soc_ops
.disable_module
)
2245 soc_ops
.disable_module(oh
);
2248 * The module must be in idle mode before disabling any parents
2249 * clocks. Otherwise, the parent clock might be disabled before
2250 * the module transition is done, and thus will prevent the
2251 * transition to complete properly.
2253 _disable_clocks(oh
);
2255 clkdm_allow_idle(oh
->clkdm
);
2256 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2259 /* Mux pins for device idle if populated */
2260 if (oh
->mux
&& oh
->mux
->pads_dynamic
) {
2261 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
2262 _reconfigure_io_chain();
2263 } else if (oh
->flags
& HWMOD_RECONFIG_IO_CHAIN
) {
2264 _reconfigure_io_chain();
2267 oh
->_state
= _HWMOD_STATE_IDLE
;
2273 * _shutdown - shutdown an omap_hwmod
2274 * @oh: struct omap_hwmod *
2276 * Shut down an omap_hwmod @oh. This should be called when the driver
2277 * used for the hwmod is removed or unloaded or if the driver is not
2278 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2279 * state or returns 0.
2281 static int _shutdown(struct omap_hwmod
*oh
)
2286 if (_are_all_hardreset_lines_asserted(oh
))
2289 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
2290 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2291 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2296 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
2298 if (oh
->class->pre_shutdown
) {
2299 prev_state
= oh
->_state
;
2300 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2302 ret
= oh
->class->pre_shutdown(oh
);
2304 if (prev_state
== _HWMOD_STATE_IDLE
)
2310 if (oh
->class->sysc
) {
2311 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2316 /* clocks and deps are already disabled in idle */
2317 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
2318 _del_initiator_dep(oh
, mpu_oh
);
2319 /* XXX what about the other system initiators here? dma, dsp */
2320 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2321 cpu_idle_poll_ctrl(false);
2322 if (soc_ops
.disable_module
)
2323 soc_ops
.disable_module(oh
);
2324 _disable_clocks(oh
);
2326 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2328 /* XXX Should this code also force-disable the optional clocks? */
2330 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
2331 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
2333 /* Mux pins to safe mode or use populated off mode values */
2335 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
2337 oh
->_state
= _HWMOD_STATE_DISABLED
;
2342 static int of_dev_find_hwmod(struct device_node
*np
,
2343 struct omap_hwmod
*oh
)
2348 count
= of_property_count_strings(np
, "ti,hwmods");
2352 for (i
= 0; i
< count
; i
++) {
2353 res
= of_property_read_string_index(np
, "ti,hwmods",
2357 if (!strcmp(p
, oh
->name
)) {
2358 pr_debug("omap_hwmod: dt %s[%i] uses hwmod %s\n",
2359 np
->name
, i
, oh
->name
);
2368 * of_dev_hwmod_lookup - look up needed hwmod from dt blob
2369 * @np: struct device_node *
2370 * @oh: struct omap_hwmod *
2371 * @index: index of the entry found
2372 * @found: struct device_node * found or NULL
2374 * Parse the dt blob and find out needed hwmod. Recursive function is
2375 * implemented to take care hierarchical dt blob parsing.
2376 * Return: Returns 0 on success, -ENODEV when not found.
2378 static int of_dev_hwmod_lookup(struct device_node
*np
,
2379 struct omap_hwmod
*oh
,
2381 struct device_node
**found
)
2383 struct device_node
*np0
= NULL
;
2386 res
= of_dev_find_hwmod(np
, oh
);
2393 for_each_child_of_node(np
, np0
) {
2394 struct device_node
*fc
;
2397 res
= of_dev_hwmod_lookup(np0
, oh
, &i
, &fc
);
2412 * _init_mpu_rt_base - populate the virtual address for a hwmod
2413 * @oh: struct omap_hwmod * to locate the virtual address
2414 * @data: (unused, caller should pass NULL)
2415 * @index: index of the reg entry iospace in device tree
2416 * @np: struct device_node * of the IP block's device node in the DT data
2418 * Cache the virtual address used by the MPU to access this IP block's
2419 * registers. This address is needed early so the OCP registers that
2420 * are part of the device's address space can be ioremapped properly.
2422 * If SYSC access is not needed, the registers will not be remapped
2423 * and non-availability of MPU access is not treated as an error.
2425 * Returns 0 on success, -EINVAL if an invalid hwmod is passed, and
2426 * -ENXIO on absent or invalid register target address space.
2428 static int __init
_init_mpu_rt_base(struct omap_hwmod
*oh
, void *data
,
2429 int index
, struct device_node
*np
)
2431 struct omap_hwmod_addr_space
*mem
;
2432 void __iomem
*va_start
= NULL
;
2437 _save_mpu_port_index(oh
);
2439 /* if we don't need sysc access we don't need to ioremap */
2440 if (!oh
->class->sysc
)
2443 /* we can't continue without MPU PORT if we need sysc access */
2444 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2447 mem
= _find_mpu_rt_addr_space(oh
);
2449 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2452 /* Extract the IO space from device tree blob */
2454 pr_err("omap_hwmod: %s: no dt node\n", oh
->name
);
2458 va_start
= of_iomap(np
, index
+ oh
->mpu_rt_idx
);
2460 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
2465 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
2467 pr_err("omap_hwmod: %s: Missing dt reg%i for %s\n",
2468 oh
->name
, index
, np
->full_name
);
2472 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2473 oh
->name
, va_start
);
2475 oh
->_mpu_rt_va
= va_start
;
2480 * _init - initialize internal data for the hwmod @oh
2481 * @oh: struct omap_hwmod *
2484 * Look up the clocks and the address space used by the MPU to access
2485 * registers belonging to the hwmod @oh. @oh must already be
2486 * registered at this point. This is the first of two phases for
2487 * hwmod initialization. Code called here does not touch any hardware
2488 * registers, it simply prepares internal data structures. Returns 0
2489 * upon success or if the hwmod isn't registered or if the hwmod's
2490 * address space is not defined, or -EINVAL upon failure.
2492 static int __init
_init(struct omap_hwmod
*oh
, void *data
)
2495 struct device_node
*np
= NULL
;
2497 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
2500 if (of_have_populated_dt()) {
2501 struct device_node
*bus
;
2503 bus
= of_find_node_by_name(NULL
, "ocp");
2507 r
= of_dev_hwmod_lookup(bus
, oh
, &index
, &np
);
2509 pr_debug("omap_hwmod: %s missing dt data\n", oh
->name
);
2510 else if (np
&& index
)
2511 pr_warn("omap_hwmod: %s using broken dt data from %s\n",
2512 oh
->name
, np
->name
);
2515 r
= _init_mpu_rt_base(oh
, NULL
, index
, np
);
2517 WARN(1, "omap_hwmod: %s: doesn't have mpu register target base\n",
2522 r
= _init_clocks(oh
, NULL
);
2524 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh
->name
);
2529 if (of_find_property(np
, "ti,no-reset-on-init", NULL
))
2530 oh
->flags
|= HWMOD_INIT_NO_RESET
;
2531 if (of_find_property(np
, "ti,no-idle-on-init", NULL
))
2532 oh
->flags
|= HWMOD_INIT_NO_IDLE
;
2533 if (of_find_property(np
, "ti,no-idle", NULL
))
2534 oh
->flags
|= HWMOD_NO_IDLE
;
2537 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
2543 * _setup_iclk_autoidle - configure an IP block's interface clocks
2544 * @oh: struct omap_hwmod *
2546 * Set up the module's interface clocks. XXX This function is still mostly
2547 * a stub; implementing this properly requires iclk autoidle usecounting in
2548 * the clock code. No return value.
2550 static void __init
_setup_iclk_autoidle(struct omap_hwmod
*oh
)
2552 struct omap_hwmod_ocp_if
*os
;
2553 struct list_head
*p
;
2555 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2558 p
= oh
->slave_ports
.next
;
2560 while (i
< oh
->slaves_cnt
) {
2561 os
= _fetch_next_ocp_if(&p
, &i
);
2565 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
2566 /* XXX omap_iclk_deny_idle(c); */
2568 /* XXX omap_iclk_allow_idle(c); */
2569 clk_enable(os
->_clk
);
2577 * _setup_reset - reset an IP block during the setup process
2578 * @oh: struct omap_hwmod *
2580 * Reset the IP block corresponding to the hwmod @oh during the setup
2581 * process. The IP block is first enabled so it can be successfully
2582 * reset. Returns 0 upon success or a negative error code upon
2585 static int __init
_setup_reset(struct omap_hwmod
*oh
)
2589 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2592 if (oh
->flags
& HWMOD_EXT_OPT_MAIN_CLK
)
2595 if (oh
->rst_lines_cnt
== 0) {
2598 pr_warn("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2599 oh
->name
, oh
->_state
);
2604 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
))
2611 * _setup_postsetup - transition to the appropriate state after _setup
2612 * @oh: struct omap_hwmod *
2614 * Place an IP block represented by @oh into a "post-setup" state --
2615 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2616 * this function is called at the end of _setup().) The postsetup
2617 * state for an IP block can be changed by calling
2618 * omap_hwmod_enter_postsetup_state() early in the boot process,
2619 * before one of the omap_hwmod_setup*() functions are called for the
2622 * The IP block stays in this state until a PM runtime-based driver is
2623 * loaded for that IP block. A post-setup state of IDLE is
2624 * appropriate for almost all IP blocks with runtime PM-enabled
2625 * drivers, since those drivers are able to enable the IP block. A
2626 * post-setup state of ENABLED is appropriate for kernels with PM
2627 * runtime disabled. The DISABLED state is appropriate for unusual IP
2628 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2629 * included, since the WDTIMER starts running on reset and will reset
2630 * the MPU if left active.
2632 * This post-setup mechanism is deprecated. Once all of the OMAP
2633 * drivers have been converted to use PM runtime, and all of the IP
2634 * block data and interconnect data is available to the hwmod code, it
2635 * should be possible to replace this mechanism with a "lazy reset"
2636 * arrangement. In a "lazy reset" setup, each IP block is enabled
2637 * when the driver first probes, then all remaining IP blocks without
2638 * drivers are either shut down or enabled after the drivers have
2639 * loaded. However, this cannot take place until the above
2640 * preconditions have been met, since otherwise the late reset code
2641 * has no way of knowing which IP blocks are in use by drivers, and
2642 * which ones are unused.
2646 static void __init
_setup_postsetup(struct omap_hwmod
*oh
)
2650 if (oh
->rst_lines_cnt
> 0)
2653 postsetup_state
= oh
->_postsetup_state
;
2654 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
2655 postsetup_state
= _HWMOD_STATE_ENABLED
;
2658 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2659 * it should be set by the core code as a runtime flag during startup
2661 if ((oh
->flags
& (HWMOD_INIT_NO_IDLE
| HWMOD_NO_IDLE
)) &&
2662 (postsetup_state
== _HWMOD_STATE_IDLE
)) {
2663 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2664 postsetup_state
= _HWMOD_STATE_ENABLED
;
2667 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2669 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2671 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2672 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2673 oh
->name
, postsetup_state
);
2679 * _setup - prepare IP block hardware for use
2680 * @oh: struct omap_hwmod *
2681 * @n: (unused, pass NULL)
2683 * Configure the IP block represented by @oh. This may include
2684 * enabling the IP block, resetting it, and placing it into a
2685 * post-setup state, depending on the type of IP block and applicable
2686 * flags. IP blocks are reset to prevent any previous configuration
2687 * by the bootloader or previous operating system from interfering
2688 * with power management or other parts of the system. The reset can
2689 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2690 * two phases for hwmod initialization. Code called here generally
2691 * affects the IP block hardware, or system integration hardware
2692 * associated with the IP block. Returns 0.
2694 static int __init
_setup(struct omap_hwmod
*oh
, void *data
)
2696 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2699 if (oh
->parent_hwmod
) {
2702 r
= _enable(oh
->parent_hwmod
);
2703 WARN(r
, "hwmod: %s: setup: failed to enable parent hwmod %s\n",
2704 oh
->name
, oh
->parent_hwmod
->name
);
2707 _setup_iclk_autoidle(oh
);
2709 if (!_setup_reset(oh
))
2710 _setup_postsetup(oh
);
2712 if (oh
->parent_hwmod
) {
2715 postsetup_state
= oh
->parent_hwmod
->_postsetup_state
;
2717 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2718 _idle(oh
->parent_hwmod
);
2719 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2720 _shutdown(oh
->parent_hwmod
);
2721 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2722 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2723 oh
->parent_hwmod
->name
, postsetup_state
);
2730 * _register - register a struct omap_hwmod
2731 * @oh: struct omap_hwmod *
2733 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2734 * already has been registered by the same name; -EINVAL if the
2735 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2736 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2737 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2740 * XXX The data should be copied into bootmem, so the original data
2741 * should be marked __initdata and freed after init. This would allow
2742 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2743 * that the copy process would be relatively complex due to the large number
2746 static int __init
_register(struct omap_hwmod
*oh
)
2748 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
2749 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
2752 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
2754 if (_lookup(oh
->name
))
2757 list_add_tail(&oh
->node
, &omap_hwmod_list
);
2759 INIT_LIST_HEAD(&oh
->master_ports
);
2760 INIT_LIST_HEAD(&oh
->slave_ports
);
2761 spin_lock_init(&oh
->_lock
);
2762 lockdep_set_class(&oh
->_lock
, &oh
->hwmod_key
);
2764 oh
->_state
= _HWMOD_STATE_REGISTERED
;
2767 * XXX Rather than doing a strcmp(), this should test a flag
2768 * set in the hwmod data, inserted by the autogenerator code.
2770 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
2777 * _alloc_links - return allocated memory for hwmod links
2778 * @ml: pointer to a struct omap_hwmod_link * for the master link
2779 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2781 * Return pointers to two struct omap_hwmod_link records, via the
2782 * addresses pointed to by @ml and @sl. Will first attempt to return
2783 * memory allocated as part of a large initial block, but if that has
2784 * been exhausted, will allocate memory itself. Since ideally this
2785 * second allocation path will never occur, the number of these
2786 * 'supplemental' allocations will be logged when debugging is
2787 * enabled. Returns 0.
2789 static int __init
_alloc_links(struct omap_hwmod_link
**ml
,
2790 struct omap_hwmod_link
**sl
)
2794 if ((free_ls
+ LINKS_PER_OCP_IF
) <= max_ls
) {
2795 *ml
= &linkspace
[free_ls
++];
2796 *sl
= &linkspace
[free_ls
++];
2800 sz
= sizeof(struct omap_hwmod_link
) * LINKS_PER_OCP_IF
;
2803 *ml
= memblock_virt_alloc(sz
, 0);
2805 *sl
= (void *)(*ml
) + sizeof(struct omap_hwmod_link
);
2808 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2809 ls_supp
* LINKS_PER_OCP_IF
);
2815 * _add_link - add an interconnect between two IP blocks
2816 * @oi: pointer to a struct omap_hwmod_ocp_if record
2818 * Add struct omap_hwmod_link records connecting the master IP block
2819 * specified in @oi->master to @oi, and connecting the slave IP block
2820 * specified in @oi->slave to @oi. This code is assumed to run before
2821 * preemption or SMP has been enabled, thus avoiding the need for
2822 * locking in this code. Changes to this assumption will require
2823 * additional locking. Returns 0.
2825 static int __init
_add_link(struct omap_hwmod_ocp_if
*oi
)
2827 struct omap_hwmod_link
*ml
, *sl
;
2829 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi
->master
->name
,
2832 _alloc_links(&ml
, &sl
);
2835 list_add(&ml
->node
, &oi
->master
->master_ports
);
2836 oi
->master
->masters_cnt
++;
2839 list_add(&sl
->node
, &oi
->slave
->slave_ports
);
2840 oi
->slave
->slaves_cnt
++;
2846 * _register_link - register a struct omap_hwmod_ocp_if
2847 * @oi: struct omap_hwmod_ocp_if *
2849 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2850 * has already been registered; -EINVAL if @oi is NULL or if the
2851 * record pointed to by @oi is missing required fields; or 0 upon
2854 * XXX The data should be copied into bootmem, so the original data
2855 * should be marked __initdata and freed after init. This would allow
2856 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2858 static int __init
_register_link(struct omap_hwmod_ocp_if
*oi
)
2860 if (!oi
|| !oi
->master
|| !oi
->slave
|| !oi
->user
)
2863 if (oi
->_int_flags
& _OCPIF_INT_FLAGS_REGISTERED
)
2866 pr_debug("omap_hwmod: registering link from %s to %s\n",
2867 oi
->master
->name
, oi
->slave
->name
);
2870 * Register the connected hwmods, if they haven't been
2871 * registered already
2873 if (oi
->master
->_state
!= _HWMOD_STATE_REGISTERED
)
2874 _register(oi
->master
);
2876 if (oi
->slave
->_state
!= _HWMOD_STATE_REGISTERED
)
2877 _register(oi
->slave
);
2881 oi
->_int_flags
|= _OCPIF_INT_FLAGS_REGISTERED
;
2887 * _alloc_linkspace - allocate large block of hwmod links
2888 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2890 * Allocate a large block of struct omap_hwmod_link records. This
2891 * improves boot time significantly by avoiding the need to allocate
2892 * individual records one by one. If the number of records to
2893 * allocate in the block hasn't been manually specified, this function
2894 * will count the number of struct omap_hwmod_ocp_if records in @ois
2895 * and use that to determine the allocation size. For SoC families
2896 * that require multiple list registrations, such as OMAP3xxx, this
2897 * estimation process isn't optimal, so manual estimation is advised
2898 * in those cases. Returns -EEXIST if the allocation has already occurred
2899 * or 0 upon success.
2901 static int __init
_alloc_linkspace(struct omap_hwmod_ocp_if
**ois
)
2907 WARN(1, "linkspace already allocated\n");
2913 max_ls
+= LINKS_PER_OCP_IF
;
2915 sz
= sizeof(struct omap_hwmod_link
) * max_ls
;
2917 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2918 __func__
, sz
, max_ls
);
2920 linkspace
= memblock_virt_alloc(sz
, 0);
2925 /* Static functions intended only for use in soc_ops field function pointers */
2928 * _omap2xxx_3xxx_wait_target_ready - wait for a module to leave slave idle
2929 * @oh: struct omap_hwmod *
2931 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2932 * does not have an IDLEST bit or if the module successfully leaves
2933 * slave idle; otherwise, pass along the return value of the
2934 * appropriate *_cm*_wait_module_ready() function.
2936 static int _omap2xxx_3xxx_wait_target_ready(struct omap_hwmod
*oh
)
2941 if (oh
->flags
& HWMOD_NO_IDLEST
)
2944 if (!_find_mpu_rt_port(oh
))
2947 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2949 return omap_cm_wait_module_ready(0, oh
->prcm
.omap2
.module_offs
,
2950 oh
->prcm
.omap2
.idlest_reg_id
,
2951 oh
->prcm
.omap2
.idlest_idle_bit
);
2955 * _omap4_wait_target_ready - wait for a module to leave slave idle
2956 * @oh: struct omap_hwmod *
2958 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2959 * does not have an IDLEST bit or if the module successfully leaves
2960 * slave idle; otherwise, pass along the return value of the
2961 * appropriate *_cm*_wait_module_ready() function.
2963 static int _omap4_wait_target_ready(struct omap_hwmod
*oh
)
2968 if (oh
->flags
& HWMOD_NO_IDLEST
|| !oh
->clkdm
)
2971 if (!_find_mpu_rt_port(oh
))
2974 /* XXX check module SIDLEMODE, hardreset status */
2976 return omap_cm_wait_module_ready(oh
->clkdm
->prcm_partition
,
2978 oh
->prcm
.omap4
.clkctrl_offs
, 0);
2982 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2983 * @oh: struct omap_hwmod * to assert hardreset
2984 * @ohri: hardreset line data
2986 * Call omap2_prm_assert_hardreset() with parameters extracted from
2987 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2988 * use as an soc_ops function pointer. Passes along the return value
2989 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2990 * for removal when the PRM code is moved into drivers/.
2992 static int _omap2_assert_hardreset(struct omap_hwmod
*oh
,
2993 struct omap_hwmod_rst_info
*ohri
)
2995 return omap_prm_assert_hardreset(ohri
->rst_shift
, 0,
2996 oh
->prcm
.omap2
.module_offs
, 0);
3000 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
3001 * @oh: struct omap_hwmod * to deassert hardreset
3002 * @ohri: hardreset line data
3004 * Call omap2_prm_deassert_hardreset() with parameters extracted from
3005 * the hwmod @oh and the hardreset line data @ohri. Only intended for
3006 * use as an soc_ops function pointer. Passes along the return value
3007 * from omap2_prm_deassert_hardreset(). XXX This function is
3008 * scheduled for removal when the PRM code is moved into drivers/.
3010 static int _omap2_deassert_hardreset(struct omap_hwmod
*oh
,
3011 struct omap_hwmod_rst_info
*ohri
)
3013 return omap_prm_deassert_hardreset(ohri
->rst_shift
, ohri
->st_shift
, 0,
3014 oh
->prcm
.omap2
.module_offs
, 0, 0);
3018 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
3019 * @oh: struct omap_hwmod * to test hardreset
3020 * @ohri: hardreset line data
3022 * Call omap2_prm_is_hardreset_asserted() 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 omap2_prm_is_hardreset_asserted(). XXX This
3026 * function is scheduled for removal when the PRM code is moved into
3029 static int _omap2_is_hardreset_asserted(struct omap_hwmod
*oh
,
3030 struct omap_hwmod_rst_info
*ohri
)
3032 return omap_prm_is_hardreset_asserted(ohri
->st_shift
, 0,
3033 oh
->prcm
.omap2
.module_offs
, 0);
3037 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3038 * @oh: struct omap_hwmod * to assert hardreset
3039 * @ohri: hardreset line data
3041 * Call omap4_prminst_assert_hardreset() with parameters extracted
3042 * from the hwmod @oh and the hardreset line data @ohri. Only
3043 * intended for use as an soc_ops function pointer. Passes along the
3044 * return value from omap4_prminst_assert_hardreset(). XXX This
3045 * function is scheduled for removal when the PRM code is moved into
3048 static int _omap4_assert_hardreset(struct omap_hwmod
*oh
,
3049 struct omap_hwmod_rst_info
*ohri
)
3054 return omap_prm_assert_hardreset(ohri
->rst_shift
,
3055 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3056 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3057 oh
->prcm
.omap4
.rstctrl_offs
);
3061 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
3062 * @oh: struct omap_hwmod * to deassert hardreset
3063 * @ohri: hardreset line data
3065 * Call omap4_prminst_deassert_hardreset() with parameters extracted
3066 * from the hwmod @oh and the hardreset line data @ohri. Only
3067 * intended for use as an soc_ops function pointer. Passes along the
3068 * return value from omap4_prminst_deassert_hardreset(). XXX This
3069 * function is scheduled for removal when the PRM code is moved into
3072 static int _omap4_deassert_hardreset(struct omap_hwmod
*oh
,
3073 struct omap_hwmod_rst_info
*ohri
)
3079 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3080 oh
->name
, ohri
->name
);
3081 return omap_prm_deassert_hardreset(ohri
->rst_shift
, ohri
->rst_shift
,
3082 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3083 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3084 oh
->prcm
.omap4
.rstctrl_offs
,
3085 oh
->prcm
.omap4
.rstctrl_offs
+
3086 OMAP4_RST_CTRL_ST_OFFSET
);
3090 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3091 * @oh: struct omap_hwmod * to test hardreset
3092 * @ohri: hardreset line data
3094 * Call omap4_prminst_is_hardreset_asserted() with parameters
3095 * extracted from the hwmod @oh and the hardreset line data @ohri.
3096 * Only intended for use as an soc_ops function pointer. Passes along
3097 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3098 * This function is scheduled for removal when the PRM code is moved
3101 static int _omap4_is_hardreset_asserted(struct omap_hwmod
*oh
,
3102 struct omap_hwmod_rst_info
*ohri
)
3107 return omap_prm_is_hardreset_asserted(ohri
->rst_shift
,
3108 oh
->clkdm
->pwrdm
.ptr
->
3110 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3111 oh
->prcm
.omap4
.rstctrl_offs
);
3115 * _omap4_disable_direct_prcm - disable direct PRCM control for hwmod
3116 * @oh: struct omap_hwmod * to disable control for
3118 * Disables direct PRCM clkctrl done by hwmod core. Instead, the hwmod
3119 * will be using its main_clk to enable/disable the module. Returns
3122 static int _omap4_disable_direct_prcm(struct omap_hwmod
*oh
)
3127 oh
->prcm
.omap4
.clkctrl_offs
= 0;
3128 oh
->prcm
.omap4
.modulemode
= 0;
3134 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3135 * @oh: struct omap_hwmod * to deassert hardreset
3136 * @ohri: hardreset line data
3138 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3139 * from the hwmod @oh and the hardreset line data @ohri. Only
3140 * intended for use as an soc_ops function pointer. Passes along the
3141 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3142 * function is scheduled for removal when the PRM code is moved into
3145 static int _am33xx_deassert_hardreset(struct omap_hwmod
*oh
,
3146 struct omap_hwmod_rst_info
*ohri
)
3148 return omap_prm_deassert_hardreset(ohri
->rst_shift
, ohri
->st_shift
,
3149 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3150 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3151 oh
->prcm
.omap4
.rstctrl_offs
,
3152 oh
->prcm
.omap4
.rstst_offs
);
3155 /* Public functions */
3157 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
3159 if (oh
->flags
& HWMOD_16BIT_REG
)
3160 return readw_relaxed(oh
->_mpu_rt_va
+ reg_offs
);
3162 return readl_relaxed(oh
->_mpu_rt_va
+ reg_offs
);
3165 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
3167 if (oh
->flags
& HWMOD_16BIT_REG
)
3168 writew_relaxed(v
, oh
->_mpu_rt_va
+ reg_offs
);
3170 writel_relaxed(v
, oh
->_mpu_rt_va
+ reg_offs
);
3174 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3175 * @oh: struct omap_hwmod *
3177 * This is a public function exposed to drivers. Some drivers may need to do
3178 * some settings before and after resetting the device. Those drivers after
3179 * doing the necessary settings could use this function to start a reset by
3180 * setting the SYSCONFIG.SOFTRESET bit.
3182 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
3187 if (!oh
|| !(oh
->_sysc_cache
))
3190 v
= oh
->_sysc_cache
;
3191 ret
= _set_softreset(oh
, &v
);
3194 _write_sysconfig(v
, oh
);
3196 ret
= _clear_softreset(oh
, &v
);
3199 _write_sysconfig(v
, oh
);
3206 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3207 * @name: name of the omap_hwmod to look up
3209 * Given a @name of an omap_hwmod, return a pointer to the registered
3210 * struct omap_hwmod *, or NULL upon error.
3212 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
3214 struct omap_hwmod
*oh
;
3225 * omap_hwmod_for_each - call function for each registered omap_hwmod
3226 * @fn: pointer to a callback function
3227 * @data: void * data to pass to callback function
3229 * Call @fn for each registered omap_hwmod, passing @data to each
3230 * function. @fn must return 0 for success or any other value for
3231 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3232 * will stop and the non-zero return value will be passed to the
3233 * caller of omap_hwmod_for_each(). @fn is called with
3234 * omap_hwmod_for_each() held.
3236 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
3239 struct omap_hwmod
*temp_oh
;
3245 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3246 ret
= (*fn
)(temp_oh
, data
);
3255 * omap_hwmod_register_links - register an array of hwmod links
3256 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3258 * Intended to be called early in boot before the clock framework is
3259 * initialized. If @ois is not null, will register all omap_hwmods
3260 * listed in @ois that are valid for this chip. Returns -EINVAL if
3261 * omap_hwmod_init() hasn't been called before calling this function,
3262 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3265 int __init
omap_hwmod_register_links(struct omap_hwmod_ocp_if
**ois
)
3275 if (ois
[0] == NULL
) /* Empty list */
3279 if (_alloc_linkspace(ois
)) {
3280 pr_err("omap_hwmod: could not allocate link space\n");
3287 r
= _register_link(ois
[i
]);
3288 WARN(r
&& r
!= -EEXIST
,
3289 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3290 ois
[i
]->master
->name
, ois
[i
]->slave
->name
, r
);
3297 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3298 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3300 * If the hwmod data corresponding to the MPU subsystem IP block
3301 * hasn't been initialized and set up yet, do so now. This must be
3302 * done first since sleep dependencies may be added from other hwmods
3303 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3306 static void __init
_ensure_mpu_hwmod_is_setup(struct omap_hwmod
*oh
)
3308 if (!mpu_oh
|| mpu_oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3309 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3310 __func__
, MPU_INITIATOR_NAME
);
3311 else if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
3312 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
3316 * omap_hwmod_setup_one - set up a single hwmod
3317 * @oh_name: const char * name of the already-registered hwmod to set up
3319 * Initialize and set up a single hwmod. Intended to be used for a
3320 * small number of early devices, such as the timer IP blocks used for
3321 * the scheduler clock. Must be called after omap2_clk_init().
3322 * Resolves the struct clk names to struct clk pointers for each
3323 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3324 * -EINVAL upon error or 0 upon success.
3326 int __init
omap_hwmod_setup_one(const char *oh_name
)
3328 struct omap_hwmod
*oh
;
3330 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
3332 oh
= _lookup(oh_name
);
3334 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
3338 _ensure_mpu_hwmod_is_setup(oh
);
3347 * omap_hwmod_setup_all - set up all registered IP blocks
3349 * Initialize and set up all IP blocks registered with the hwmod code.
3350 * Must be called after omap2_clk_init(). Resolves the struct clk
3351 * names to struct clk pointers for each registered omap_hwmod. Also
3352 * calls _setup() on each hwmod. Returns 0 upon success.
3354 static int __init
omap_hwmod_setup_all(void)
3356 _ensure_mpu_hwmod_is_setup(NULL
);
3358 omap_hwmod_for_each(_init
, NULL
);
3359 omap_hwmod_for_each(_setup
, NULL
);
3363 omap_postcore_initcall(omap_hwmod_setup_all
);
3366 * omap_hwmod_enable - enable an omap_hwmod
3367 * @oh: struct omap_hwmod *
3369 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3370 * Returns -EINVAL on error or passes along the return value from _enable().
3372 int omap_hwmod_enable(struct omap_hwmod
*oh
)
3375 unsigned long flags
;
3380 spin_lock_irqsave(&oh
->_lock
, flags
);
3382 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3388 * omap_hwmod_idle - idle an omap_hwmod
3389 * @oh: struct omap_hwmod *
3391 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3392 * Returns -EINVAL on error or passes along the return value from _idle().
3394 int omap_hwmod_idle(struct omap_hwmod
*oh
)
3397 unsigned long flags
;
3402 spin_lock_irqsave(&oh
->_lock
, flags
);
3404 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3410 * omap_hwmod_shutdown - shutdown an omap_hwmod
3411 * @oh: struct omap_hwmod *
3413 * Shutdown an omap_hwmod @oh. Intended to be called by
3414 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3415 * the return value from _shutdown().
3417 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
3420 unsigned long flags
;
3425 spin_lock_irqsave(&oh
->_lock
, flags
);
3427 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3433 * IP block data retrieval functions
3437 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3438 * @oh: struct omap_hwmod *
3439 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3441 * Count the number of struct resource array elements necessary to
3442 * contain omap_hwmod @oh resources. Intended to be called by code
3443 * that registers omap_devices. Intended to be used to determine the
3444 * size of a dynamically-allocated struct resource array, before
3445 * calling omap_hwmod_fill_resources(). Returns the number of struct
3446 * resource array elements needed.
3448 * XXX This code is not optimized. It could attempt to merge adjacent
3452 int omap_hwmod_count_resources(struct omap_hwmod
*oh
, unsigned long flags
)
3456 if (flags
& IORESOURCE_IRQ
)
3457 ret
+= _count_mpu_irqs(oh
);
3459 if (flags
& IORESOURCE_DMA
)
3460 ret
+= _count_sdma_reqs(oh
);
3462 if (flags
& IORESOURCE_MEM
) {
3464 struct omap_hwmod_ocp_if
*os
;
3465 struct list_head
*p
= oh
->slave_ports
.next
;
3467 while (i
< oh
->slaves_cnt
) {
3468 os
= _fetch_next_ocp_if(&p
, &i
);
3469 ret
+= _count_ocp_if_addr_spaces(os
);
3477 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3478 * @oh: struct omap_hwmod *
3479 * @res: pointer to the first element of an array of struct resource to fill
3481 * Fill the struct resource array @res with resource data from the
3482 * omap_hwmod @oh. Intended to be called by code that registers
3483 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3484 * number of array elements filled.
3486 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3488 struct omap_hwmod_ocp_if
*os
;
3489 struct list_head
*p
;
3490 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
, addr_cnt
;
3493 /* For each IRQ, DMA, memory area, fill in array.*/
3495 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
3496 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
3500 irq
= oh
->xlate_irq((oh
->mpu_irqs
+ i
)->irq
);
3502 irq
= (oh
->mpu_irqs
+ i
)->irq
;
3503 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
3504 (res
+ r
)->start
= irq
;
3505 (res
+ r
)->end
= irq
;
3506 (res
+ r
)->flags
= IORESOURCE_IRQ
;
3510 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3511 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3512 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3513 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3514 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3515 (res
+ r
)->flags
= IORESOURCE_DMA
;
3519 p
= oh
->slave_ports
.next
;
3522 while (i
< oh
->slaves_cnt
) {
3523 os
= _fetch_next_ocp_if(&p
, &i
);
3524 addr_cnt
= _count_ocp_if_addr_spaces(os
);
3526 for (j
= 0; j
< addr_cnt
; j
++) {
3527 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
3528 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
3529 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
3530 (res
+ r
)->flags
= IORESOURCE_MEM
;
3539 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3540 * @oh: struct omap_hwmod *
3541 * @res: pointer to the array of struct resource to fill
3543 * Fill the struct resource array @res with dma resource data from the
3544 * omap_hwmod @oh. Intended to be called by code that registers
3545 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3546 * number of array elements filled.
3548 int omap_hwmod_fill_dma_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3550 int i
, sdma_reqs_cnt
;
3553 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3554 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3555 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3556 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3557 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3558 (res
+ r
)->flags
= IORESOURCE_DMA
;
3566 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3567 * @oh: struct omap_hwmod * to operate on
3568 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3569 * @name: pointer to the name of the data to fetch (optional)
3570 * @rsrc: pointer to a struct resource, allocated by the caller
3572 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3573 * data for the IP block pointed to by @oh. The data will be filled
3574 * into a struct resource record pointed to by @rsrc. The struct
3575 * resource must be allocated by the caller. When @name is non-null,
3576 * the data associated with the matching entry in the IRQ/SDMA/address
3577 * space hwmod data arrays will be returned. If @name is null, the
3578 * first array entry will be returned. Data order is not meaningful
3579 * in hwmod data, so callers are strongly encouraged to use a non-null
3580 * @name whenever possible to avoid unpredictable effects if hwmod
3581 * data is later added that causes data ordering to change. This
3582 * function is only intended for use by OMAP core code. Device
3583 * drivers should not call this function - the appropriate bus-related
3584 * data accessor functions should be used instead. Returns 0 upon
3585 * success or a negative error code upon error.
3587 int omap_hwmod_get_resource_byname(struct omap_hwmod
*oh
, unsigned int type
,
3588 const char *name
, struct resource
*rsrc
)
3591 unsigned int irq
, dma
;
3592 u32 pa_start
, pa_end
;
3597 if (type
== IORESOURCE_IRQ
) {
3598 r
= _get_mpu_irq_by_name(oh
, name
, &irq
);
3604 } else if (type
== IORESOURCE_DMA
) {
3605 r
= _get_sdma_req_by_name(oh
, name
, &dma
);
3611 } else if (type
== IORESOURCE_MEM
) {
3612 r
= _get_addr_space_by_name(oh
, name
, &pa_start
, &pa_end
);
3616 rsrc
->start
= pa_start
;
3629 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3630 * @oh: struct omap_hwmod *
3632 * Return the powerdomain pointer associated with the OMAP module
3633 * @oh's main clock. If @oh does not have a main clk, return the
3634 * powerdomain associated with the interface clock associated with the
3635 * module's MPU port. (XXX Perhaps this should use the SDMA port
3636 * instead?) Returns NULL on error, or a struct powerdomain * on
3639 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
3642 struct omap_hwmod_ocp_if
*oi
;
3643 struct clockdomain
*clkdm
;
3644 struct clk_hw_omap
*clk
;
3650 return oh
->clkdm
->pwrdm
.ptr
;
3655 oi
= _find_mpu_rt_port(oh
);
3661 clk
= to_clk_hw_omap(__clk_get_hw(c
));
3666 return clkdm
->pwrdm
.ptr
;
3670 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3671 * @oh: struct omap_hwmod *
3673 * Returns the virtual address corresponding to the beginning of the
3674 * module's register target, in the address range that is intended to
3675 * be used by the MPU. Returns the virtual address upon success or NULL
3678 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
3683 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
3686 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3689 return oh
->_mpu_rt_va
;
3693 * XXX what about functions for drivers to save/restore ocp_sysconfig
3694 * for context save/restore operations?
3698 * omap_hwmod_enable_wakeup - allow device to wake up the system
3699 * @oh: struct omap_hwmod *
3701 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3702 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3703 * this IP block if it has dynamic mux entries. Eventually this
3704 * should set PRCM wakeup registers to cause the PRCM to receive
3705 * wakeup events from the module. Does not set any wakeup routing
3706 * registers beyond this point - if the module is to wake up any other
3707 * module or subsystem, that must be set separately. Called by
3708 * omap_device code. Returns -EINVAL on error or 0 upon success.
3710 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
3712 unsigned long flags
;
3715 spin_lock_irqsave(&oh
->_lock
, flags
);
3717 if (oh
->class->sysc
&&
3718 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3719 v
= oh
->_sysc_cache
;
3720 _enable_wakeup(oh
, &v
);
3721 _write_sysconfig(v
, oh
);
3724 _set_idle_ioring_wakeup(oh
, true);
3725 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3731 * omap_hwmod_disable_wakeup - prevent device from waking the system
3732 * @oh: struct omap_hwmod *
3734 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3735 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3736 * events for this IP block if it has dynamic mux entries. Eventually
3737 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3738 * wakeup events from the module. Does not set any wakeup routing
3739 * registers beyond this point - if the module is to wake up any other
3740 * module or subsystem, that must be set separately. Called by
3741 * omap_device code. Returns -EINVAL on error or 0 upon success.
3743 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
3745 unsigned long flags
;
3748 spin_lock_irqsave(&oh
->_lock
, flags
);
3750 if (oh
->class->sysc
&&
3751 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3752 v
= oh
->_sysc_cache
;
3753 _disable_wakeup(oh
, &v
);
3754 _write_sysconfig(v
, oh
);
3757 _set_idle_ioring_wakeup(oh
, false);
3758 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3764 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3765 * contained in the hwmod module.
3766 * @oh: struct omap_hwmod *
3767 * @name: name of the reset line to lookup and assert
3769 * Some IP like dsp, ipu or iva contain processor that require
3770 * an HW reset line to be assert / deassert in order to enable fully
3771 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3772 * yet supported on this OMAP; otherwise, passes along the return value
3773 * from _assert_hardreset().
3775 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3778 unsigned long flags
;
3783 spin_lock_irqsave(&oh
->_lock
, flags
);
3784 ret
= _assert_hardreset(oh
, name
);
3785 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3791 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3792 * contained in the hwmod module.
3793 * @oh: struct omap_hwmod *
3794 * @name: name of the reset line to look up and deassert
3796 * Some IP like dsp, ipu or iva contain processor that require
3797 * an HW reset line to be assert / deassert in order to enable fully
3798 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3799 * yet supported on this OMAP; otherwise, passes along the return value
3800 * from _deassert_hardreset().
3802 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3805 unsigned long flags
;
3810 spin_lock_irqsave(&oh
->_lock
, flags
);
3811 ret
= _deassert_hardreset(oh
, name
);
3812 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3818 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3819 * @classname: struct omap_hwmod_class name to search for
3820 * @fn: callback function pointer to call for each hwmod in class @classname
3821 * @user: arbitrary context data to pass to the callback function
3823 * For each omap_hwmod of class @classname, call @fn.
3824 * If the callback function returns something other than
3825 * zero, the iterator is terminated, and the callback function's return
3826 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3827 * if @classname or @fn are NULL, or passes back the error code from @fn.
3829 int omap_hwmod_for_each_by_class(const char *classname
,
3830 int (*fn
)(struct omap_hwmod
*oh
,
3834 struct omap_hwmod
*temp_oh
;
3837 if (!classname
|| !fn
)
3840 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3841 __func__
, classname
);
3843 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3844 if (!strcmp(temp_oh
->class->name
, classname
)) {
3845 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3846 __func__
, temp_oh
->name
);
3847 ret
= (*fn
)(temp_oh
, user
);
3854 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3861 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3862 * @oh: struct omap_hwmod *
3863 * @state: state that _setup() should leave the hwmod in
3865 * Sets the hwmod state that @oh will enter at the end of _setup()
3866 * (called by omap_hwmod_setup_*()). See also the documentation
3867 * for _setup_postsetup(), above. Returns 0 upon success or
3868 * -EINVAL if there is a problem with the arguments or if the hwmod is
3869 * in the wrong state.
3871 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
3874 unsigned long flags
;
3879 if (state
!= _HWMOD_STATE_DISABLED
&&
3880 state
!= _HWMOD_STATE_ENABLED
&&
3881 state
!= _HWMOD_STATE_IDLE
)
3884 spin_lock_irqsave(&oh
->_lock
, flags
);
3886 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
3891 oh
->_postsetup_state
= state
;
3895 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3901 * omap_hwmod_get_context_loss_count - get lost context count
3902 * @oh: struct omap_hwmod *
3904 * Returns the context loss count of associated @oh
3905 * upon success, or zero if no context loss data is available.
3907 * On OMAP4, this queries the per-hwmod context loss register,
3908 * assuming one exists. If not, or on OMAP2/3, this queries the
3909 * enclosing powerdomain context loss count.
3911 int omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
3913 struct powerdomain
*pwrdm
;
3916 if (soc_ops
.get_context_lost
)
3917 return soc_ops
.get_context_lost(oh
);
3919 pwrdm
= omap_hwmod_get_pwrdm(oh
);
3921 ret
= pwrdm_get_context_loss_count(pwrdm
);
3927 * omap_hwmod_init - initialize the hwmod code
3929 * Sets up some function pointers needed by the hwmod code to operate on the
3930 * currently-booted SoC. Intended to be called once during kernel init
3931 * before any hwmods are registered. No return value.
3933 void __init
omap_hwmod_init(void)
3935 if (cpu_is_omap24xx()) {
3936 soc_ops
.wait_target_ready
= _omap2xxx_3xxx_wait_target_ready
;
3937 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
3938 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
3939 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
3940 } else if (cpu_is_omap34xx()) {
3941 soc_ops
.wait_target_ready
= _omap2xxx_3xxx_wait_target_ready
;
3942 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
3943 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
3944 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
3945 soc_ops
.init_clkdm
= _init_clkdm
;
3946 } else if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
3947 soc_ops
.enable_module
= _omap4_enable_module
;
3948 soc_ops
.disable_module
= _omap4_disable_module
;
3949 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
3950 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
3951 soc_ops
.deassert_hardreset
= _omap4_deassert_hardreset
;
3952 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
3953 soc_ops
.init_clkdm
= _init_clkdm
;
3954 soc_ops
.update_context_lost
= _omap4_update_context_lost
;
3955 soc_ops
.get_context_lost
= _omap4_get_context_lost
;
3956 soc_ops
.disable_direct_prcm
= _omap4_disable_direct_prcm
;
3957 } else if (cpu_is_ti814x() || cpu_is_ti816x() || soc_is_am33xx() ||
3959 soc_ops
.enable_module
= _omap4_enable_module
;
3960 soc_ops
.disable_module
= _omap4_disable_module
;
3961 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
3962 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
3963 soc_ops
.deassert_hardreset
= _am33xx_deassert_hardreset
;
3964 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
3965 soc_ops
.init_clkdm
= _init_clkdm
;
3966 soc_ops
.disable_direct_prcm
= _omap4_disable_direct_prcm
;
3968 WARN(1, "omap_hwmod: unknown SoC type\n");
3975 * omap_hwmod_get_main_clk - get pointer to main clock name
3976 * @oh: struct omap_hwmod *
3978 * Returns the main clock name assocated with @oh upon success,
3979 * or NULL if @oh is NULL.
3981 const char *omap_hwmod_get_main_clk(struct omap_hwmod
*oh
)
3986 return oh
->main_clk
;