2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
143 #include "omap_hwmod.h"
144 #include <plat/prcm.h>
148 #include "clockdomain.h"
149 #include "powerdomain.h"
152 #include "cminst44xx.h"
157 #include "prminst44xx.h"
161 /* Maximum microseconds to wait for OMAP module to softreset */
162 #define MAX_MODULE_SOFTRESET_WAIT 10000
164 /* Name of the OMAP hwmod for the MPU */
165 #define MPU_INITIATOR_NAME "mpu"
168 * Number of struct omap_hwmod_link records per struct
169 * omap_hwmod_ocp_if record (master->slave and slave->master)
171 #define LINKS_PER_OCP_IF 2
174 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
175 * @enable_module: function to enable a module (via MODULEMODE)
176 * @disable_module: function to disable a module (via MODULEMODE)
178 * XXX Eventually this functionality will be hidden inside the PRM/CM
179 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
180 * conditionals in this code.
182 struct omap_hwmod_soc_ops
{
183 void (*enable_module
)(struct omap_hwmod
*oh
);
184 int (*disable_module
)(struct omap_hwmod
*oh
);
185 int (*wait_target_ready
)(struct omap_hwmod
*oh
);
186 int (*assert_hardreset
)(struct omap_hwmod
*oh
,
187 struct omap_hwmod_rst_info
*ohri
);
188 int (*deassert_hardreset
)(struct omap_hwmod
*oh
,
189 struct omap_hwmod_rst_info
*ohri
);
190 int (*is_hardreset_asserted
)(struct omap_hwmod
*oh
,
191 struct omap_hwmod_rst_info
*ohri
);
192 int (*init_clkdm
)(struct omap_hwmod
*oh
);
195 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
196 static struct omap_hwmod_soc_ops soc_ops
;
198 /* omap_hwmod_list contains all registered struct omap_hwmods */
199 static LIST_HEAD(omap_hwmod_list
);
201 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
202 static struct omap_hwmod
*mpu_oh
;
204 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
205 static DEFINE_SPINLOCK(io_chain_lock
);
208 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
209 * allocated from - used to reduce the number of small memory
210 * allocations, which has a significant impact on performance
212 static struct omap_hwmod_link
*linkspace
;
215 * free_ls, max_ls: array indexes into linkspace; representing the
216 * next free struct omap_hwmod_link index, and the maximum number of
217 * struct omap_hwmod_link records allocated (respectively)
219 static unsigned short free_ls
, max_ls
, ls_supp
;
221 /* inited: set to true once the hwmod code is initialized */
224 /* Private functions */
227 * _fetch_next_ocp_if - return the next OCP interface in a list
228 * @p: ptr to a ptr to the list_head inside the ocp_if to return
229 * @i: pointer to the index of the element pointed to by @p in the list
231 * Return a pointer to the struct omap_hwmod_ocp_if record
232 * containing the struct list_head pointed to by @p, and increment
233 * @p such that a future call to this routine will return the next
236 static struct omap_hwmod_ocp_if
*_fetch_next_ocp_if(struct list_head
**p
,
239 struct omap_hwmod_ocp_if
*oi
;
241 oi
= list_entry(*p
, struct omap_hwmod_link
, node
)->ocp_if
;
250 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
251 * @oh: struct omap_hwmod *
253 * Load the current value of the hwmod OCP_SYSCONFIG register into the
254 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
255 * OCP_SYSCONFIG register or 0 upon success.
257 static int _update_sysc_cache(struct omap_hwmod
*oh
)
259 if (!oh
->class->sysc
) {
260 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
264 /* XXX ensure module interface clock is up */
266 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
268 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
269 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
275 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
276 * @v: OCP_SYSCONFIG value to write
277 * @oh: struct omap_hwmod *
279 * Write @v into the module class' OCP_SYSCONFIG register, if it has
280 * one. No return value.
282 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
284 if (!oh
->class->sysc
) {
285 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
289 /* XXX ensure module interface clock is up */
291 /* Module might have lost context, always update cache and register */
293 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
297 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
298 * @oh: struct omap_hwmod *
299 * @standbymode: MIDLEMODE field bits
300 * @v: pointer to register contents to modify
302 * Update the master standby mode bits in @v to be @standbymode for
303 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
304 * upon error or 0 upon success.
306 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
312 if (!oh
->class->sysc
||
313 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
316 if (!oh
->class->sysc
->sysc_fields
) {
317 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
321 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
322 mstandby_mask
= (0x3 << mstandby_shift
);
324 *v
&= ~mstandby_mask
;
325 *v
|= __ffs(standbymode
) << mstandby_shift
;
331 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
332 * @oh: struct omap_hwmod *
333 * @idlemode: SIDLEMODE field bits
334 * @v: pointer to register contents to modify
336 * Update the slave idle mode bits in @v to be @idlemode for the @oh
337 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
340 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
345 if (!oh
->class->sysc
||
346 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
349 if (!oh
->class->sysc
->sysc_fields
) {
350 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
354 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
355 sidle_mask
= (0x3 << sidle_shift
);
358 *v
|= __ffs(idlemode
) << sidle_shift
;
364 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
365 * @oh: struct omap_hwmod *
366 * @clockact: CLOCKACTIVITY field bits
367 * @v: pointer to register contents to modify
369 * Update the clockactivity mode bits in @v to be @clockact for the
370 * @oh hwmod. Used for additional powersaving on some modules. Does
371 * not write to the hardware. Returns -EINVAL upon error or 0 upon
374 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
379 if (!oh
->class->sysc
||
380 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
383 if (!oh
->class->sysc
->sysc_fields
) {
384 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
388 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
389 clkact_mask
= (0x3 << clkact_shift
);
392 *v
|= clockact
<< clkact_shift
;
398 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
399 * @oh: struct omap_hwmod *
400 * @v: pointer to register contents to modify
402 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
403 * error or 0 upon success.
405 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
409 if (!oh
->class->sysc
||
410 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
413 if (!oh
->class->sysc
->sysc_fields
) {
414 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
418 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
426 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
427 * @oh: struct omap_hwmod *
429 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
430 * of some modules. When the DMA must perform read/write accesses, the
431 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
432 * for power management, software must set the DMADISABLE bit back to 1.
434 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
435 * error or 0 upon success.
437 static int _set_dmadisable(struct omap_hwmod
*oh
)
442 if (!oh
->class->sysc
||
443 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_DMADISABLE
))
446 if (!oh
->class->sysc
->sysc_fields
) {
447 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
451 /* clocks must be on for this operation */
452 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
453 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh
->name
);
457 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh
->name
);
461 (0x1 << oh
->class->sysc
->sysc_fields
->dmadisable_shift
);
462 v
|= dmadisable_mask
;
463 _write_sysconfig(v
, oh
);
469 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
470 * @oh: struct omap_hwmod *
471 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
472 * @v: pointer to register contents to modify
474 * Update the module autoidle bit in @v to be @autoidle for the @oh
475 * hwmod. The autoidle bit controls whether the module can gate
476 * internal clocks automatically when it isn't doing anything; the
477 * exact function of this bit varies on a per-module basis. This
478 * function does not write to the hardware. Returns -EINVAL upon
479 * error or 0 upon success.
481 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
487 if (!oh
->class->sysc
||
488 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
491 if (!oh
->class->sysc
->sysc_fields
) {
492 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
496 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
497 autoidle_mask
= (0x1 << autoidle_shift
);
499 *v
&= ~autoidle_mask
;
500 *v
|= autoidle
<< autoidle_shift
;
506 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
507 * @oh: struct omap_hwmod *
508 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
510 * Set or clear the I/O pad wakeup flag in the mux entries for the
511 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
512 * in memory. If the hwmod is currently idled, and the new idle
513 * values don't match the previous ones, this function will also
514 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
515 * currently idled, this function won't touch the hardware: the new
516 * mux settings are written to the SCM PADCTRL registers when the
517 * hwmod is idled. No return value.
519 static void _set_idle_ioring_wakeup(struct omap_hwmod
*oh
, bool set_wake
)
521 struct omap_device_pad
*pad
;
526 if (!oh
->mux
|| !oh
->mux
->enabled
)
529 for (j
= 0; j
< oh
->mux
->nr_pads_dynamic
; j
++) {
530 pad
= oh
->mux
->pads_dynamic
[j
];
532 if (!(pad
->flags
& OMAP_DEVICE_PAD_WAKEUP
))
535 prev_idle
= pad
->idle
;
538 pad
->idle
|= OMAP_WAKEUP_EN
;
540 pad
->idle
&= ~OMAP_WAKEUP_EN
;
542 if (prev_idle
!= pad
->idle
)
546 if (change
&& oh
->_state
== _HWMOD_STATE_IDLE
)
547 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
551 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
552 * @oh: struct omap_hwmod *
554 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
555 * upon error or 0 upon success.
557 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
559 if (!oh
->class->sysc
||
560 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
561 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
562 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
565 if (!oh
->class->sysc
->sysc_fields
) {
566 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
570 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
571 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
573 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
574 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
575 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
576 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
578 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
580 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
586 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
587 * @oh: struct omap_hwmod *
589 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
590 * upon error or 0 upon success.
592 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
594 if (!oh
->class->sysc
||
595 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
596 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
597 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
600 if (!oh
->class->sysc
->sysc_fields
) {
601 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
605 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
606 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
608 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
609 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
610 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
611 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART
, v
);
613 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
615 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
621 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
622 * @oh: struct omap_hwmod *
624 * Prevent the hardware module @oh from entering idle while the
625 * hardare module initiator @init_oh is active. Useful when a module
626 * will be accessed by a particular initiator (e.g., if a module will
627 * be accessed by the IVA, there should be a sleepdep between the IVA
628 * initiator and the module). Only applies to modules in smart-idle
629 * mode. If the clockdomain is marked as not needing autodeps, return
630 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
631 * passes along clkdm_add_sleepdep() value upon success.
633 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
638 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
641 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
645 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
646 * @oh: struct omap_hwmod *
648 * Allow the hardware module @oh to enter idle while the hardare
649 * module initiator @init_oh is active. Useful when a module will not
650 * be accessed by a particular initiator (e.g., if a module will not
651 * be accessed by the IVA, there should be no sleepdep between the IVA
652 * initiator and the module). Only applies to modules in smart-idle
653 * mode. If the clockdomain is marked as not needing autodeps, return
654 * 0 without doing anything. Returns -EINVAL upon error or passes
655 * along clkdm_del_sleepdep() value upon success.
657 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
662 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
665 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
669 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
670 * @oh: struct omap_hwmod *
672 * Called from _init_clocks(). Populates the @oh _clk (main
673 * functional clock pointer) if a main_clk is present. Returns 0 on
674 * success or -EINVAL on error.
676 static int _init_main_clk(struct omap_hwmod
*oh
)
683 oh
->_clk
= clk_get(NULL
, oh
->main_clk
);
684 if (IS_ERR(oh
->_clk
)) {
685 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
686 oh
->name
, oh
->main_clk
);
690 * HACK: This needs a re-visit once clk_prepare() is implemented
691 * to do something meaningful. Today its just a no-op.
692 * If clk_prepare() is used at some point to do things like
693 * voltage scaling etc, then this would have to be moved to
694 * some point where subsystems like i2c and pmic become
697 clk_prepare(oh
->_clk
);
699 if (!oh
->_clk
->clkdm
)
700 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
701 oh
->name
, oh
->main_clk
);
707 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
708 * @oh: struct omap_hwmod *
710 * Called from _init_clocks(). Populates the @oh OCP slave interface
711 * clock pointers. Returns 0 on success or -EINVAL on error.
713 static int _init_interface_clks(struct omap_hwmod
*oh
)
715 struct omap_hwmod_ocp_if
*os
;
721 p
= oh
->slave_ports
.next
;
723 while (i
< oh
->slaves_cnt
) {
724 os
= _fetch_next_ocp_if(&p
, &i
);
728 c
= clk_get(NULL
, os
->clk
);
730 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
736 * HACK: This needs a re-visit once clk_prepare() is implemented
737 * to do something meaningful. Today its just a no-op.
738 * If clk_prepare() is used at some point to do things like
739 * voltage scaling etc, then this would have to be moved to
740 * some point where subsystems like i2c and pmic become
743 clk_prepare(os
->_clk
);
750 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
751 * @oh: struct omap_hwmod *
753 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
754 * clock pointers. Returns 0 on success or -EINVAL on error.
756 static int _init_opt_clks(struct omap_hwmod
*oh
)
758 struct omap_hwmod_opt_clk
*oc
;
763 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
764 c
= clk_get(NULL
, oc
->clk
);
766 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
772 * HACK: This needs a re-visit once clk_prepare() is implemented
773 * to do something meaningful. Today its just a no-op.
774 * If clk_prepare() is used at some point to do things like
775 * voltage scaling etc, then this would have to be moved to
776 * some point where subsystems like i2c and pmic become
779 clk_prepare(oc
->_clk
);
786 * _enable_clocks - enable hwmod main clock and interface clocks
787 * @oh: struct omap_hwmod *
789 * Enables all clocks necessary for register reads and writes to succeed
790 * on the hwmod @oh. Returns 0.
792 static int _enable_clocks(struct omap_hwmod
*oh
)
794 struct omap_hwmod_ocp_if
*os
;
798 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
801 clk_enable(oh
->_clk
);
803 p
= oh
->slave_ports
.next
;
805 while (i
< oh
->slaves_cnt
) {
806 os
= _fetch_next_ocp_if(&p
, &i
);
808 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
809 clk_enable(os
->_clk
);
812 /* The opt clocks are controlled by the device driver. */
818 * _disable_clocks - disable hwmod main clock and interface clocks
819 * @oh: struct omap_hwmod *
821 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
823 static int _disable_clocks(struct omap_hwmod
*oh
)
825 struct omap_hwmod_ocp_if
*os
;
829 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
832 clk_disable(oh
->_clk
);
834 p
= oh
->slave_ports
.next
;
836 while (i
< oh
->slaves_cnt
) {
837 os
= _fetch_next_ocp_if(&p
, &i
);
839 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
840 clk_disable(os
->_clk
);
843 /* The opt clocks are controlled by the device driver. */
848 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
850 struct omap_hwmod_opt_clk
*oc
;
853 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
855 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
857 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
858 __clk_get_name(oc
->_clk
));
859 clk_enable(oc
->_clk
);
863 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
865 struct omap_hwmod_opt_clk
*oc
;
868 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
870 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
872 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
873 __clk_get_name(oc
->_clk
));
874 clk_disable(oc
->_clk
);
879 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
880 * @oh: struct omap_hwmod *
882 * Enables the PRCM module mode related to the hwmod @oh.
885 static void _omap4_enable_module(struct omap_hwmod
*oh
)
887 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
890 pr_debug("omap_hwmod: %s: %s: %d\n",
891 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
893 omap4_cminst_module_enable(oh
->prcm
.omap4
.modulemode
,
894 oh
->clkdm
->prcm_partition
,
896 oh
->clkdm
->clkdm_offs
,
897 oh
->prcm
.omap4
.clkctrl_offs
);
901 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
902 * @oh: struct omap_hwmod *
904 * Enables the PRCM module mode related to the hwmod @oh.
907 static void _am33xx_enable_module(struct omap_hwmod
*oh
)
909 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
912 pr_debug("omap_hwmod: %s: %s: %d\n",
913 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
915 am33xx_cm_module_enable(oh
->prcm
.omap4
.modulemode
, oh
->clkdm
->cm_inst
,
916 oh
->clkdm
->clkdm_offs
,
917 oh
->prcm
.omap4
.clkctrl_offs
);
921 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
922 * @oh: struct omap_hwmod *
924 * Wait for a module @oh to enter slave idle. Returns 0 if the module
925 * does not have an IDLEST bit or if the module successfully enters
926 * slave idle; otherwise, pass along the return value of the
927 * appropriate *_cm*_wait_module_idle() function.
929 static int _omap4_wait_target_disable(struct omap_hwmod
*oh
)
934 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| !oh
->clkdm
)
937 if (oh
->flags
& HWMOD_NO_IDLEST
)
940 return omap4_cminst_wait_module_idle(oh
->clkdm
->prcm_partition
,
942 oh
->clkdm
->clkdm_offs
,
943 oh
->prcm
.omap4
.clkctrl_offs
);
947 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
948 * @oh: struct omap_hwmod *
950 * Wait for a module @oh to enter slave idle. Returns 0 if the module
951 * does not have an IDLEST bit or if the module successfully enters
952 * slave idle; otherwise, pass along the return value of the
953 * appropriate *_cm*_wait_module_idle() function.
955 static int _am33xx_wait_target_disable(struct omap_hwmod
*oh
)
960 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
963 if (oh
->flags
& HWMOD_NO_IDLEST
)
966 return am33xx_cm_wait_module_idle(oh
->clkdm
->cm_inst
,
967 oh
->clkdm
->clkdm_offs
,
968 oh
->prcm
.omap4
.clkctrl_offs
);
972 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
973 * @oh: struct omap_hwmod *oh
975 * Count and return the number of MPU IRQs associated with the hwmod
976 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
979 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
981 struct omap_hwmod_irq_info
*ohii
;
984 if (!oh
|| !oh
->mpu_irqs
)
988 ohii
= &oh
->mpu_irqs
[i
++];
989 } while (ohii
->irq
!= -1);
995 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
996 * @oh: struct omap_hwmod *oh
998 * Count and return the number of SDMA request lines associated with
999 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1002 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
1004 struct omap_hwmod_dma_info
*ohdi
;
1007 if (!oh
|| !oh
->sdma_reqs
)
1011 ohdi
= &oh
->sdma_reqs
[i
++];
1012 } while (ohdi
->dma_req
!= -1);
1018 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1019 * @oh: struct omap_hwmod *oh
1021 * Count and return the number of address space ranges associated with
1022 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1025 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
1027 struct omap_hwmod_addr_space
*mem
;
1030 if (!os
|| !os
->addr
)
1034 mem
= &os
->addr
[i
++];
1035 } while (mem
->pa_start
!= mem
->pa_end
);
1041 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1042 * @oh: struct omap_hwmod * to operate on
1043 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1044 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1046 * Retrieve a MPU hardware IRQ line number named by @name associated
1047 * with the IP block pointed to by @oh. The IRQ number will be filled
1048 * into the address pointed to by @dma. When @name is non-null, the
1049 * IRQ line number associated with the named entry will be returned.
1050 * If @name is null, the first matching entry will be returned. Data
1051 * order is not meaningful in hwmod data, so callers are strongly
1052 * encouraged to use a non-null @name whenever possible to avoid
1053 * unpredictable effects if hwmod data is later added that causes data
1054 * ordering to change. Returns 0 upon success or a negative error
1057 static int _get_mpu_irq_by_name(struct omap_hwmod
*oh
, const char *name
,
1067 while (oh
->mpu_irqs
[i
].irq
!= -1) {
1068 if (name
== oh
->mpu_irqs
[i
].name
||
1069 !strcmp(name
, oh
->mpu_irqs
[i
].name
)) {
1079 *irq
= oh
->mpu_irqs
[i
].irq
;
1085 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1086 * @oh: struct omap_hwmod * to operate on
1087 * @name: pointer to the name of the SDMA request line to fetch (optional)
1088 * @dma: pointer to an unsigned int to store the request line ID to
1090 * Retrieve an SDMA request line ID named by @name on the IP block
1091 * pointed to by @oh. The ID will be filled into the address pointed
1092 * to by @dma. When @name is non-null, the request line ID associated
1093 * with the named entry will be returned. If @name is null, the first
1094 * matching entry will be returned. Data order is not meaningful in
1095 * hwmod data, so callers are strongly encouraged to use a non-null
1096 * @name whenever possible to avoid unpredictable effects if hwmod
1097 * data is later added that causes data ordering to change. Returns 0
1098 * upon success or a negative error code upon error.
1100 static int _get_sdma_req_by_name(struct omap_hwmod
*oh
, const char *name
,
1110 while (oh
->sdma_reqs
[i
].dma_req
!= -1) {
1111 if (name
== oh
->sdma_reqs
[i
].name
||
1112 !strcmp(name
, oh
->sdma_reqs
[i
].name
)) {
1122 *dma
= oh
->sdma_reqs
[i
].dma_req
;
1128 * _get_addr_space_by_name - fetch address space start & end by name
1129 * @oh: struct omap_hwmod * to operate on
1130 * @name: pointer to the name of the address space to fetch (optional)
1131 * @pa_start: pointer to a u32 to store the starting address to
1132 * @pa_end: pointer to a u32 to store the ending address to
1134 * Retrieve address space start and end addresses for the IP block
1135 * pointed to by @oh. The data will be filled into the addresses
1136 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1137 * address space data associated with the named entry will be
1138 * returned. If @name is null, the first matching entry will be
1139 * returned. Data order is not meaningful in hwmod data, so callers
1140 * are strongly encouraged to use a non-null @name whenever possible
1141 * to avoid unpredictable effects if hwmod data is later added that
1142 * causes data ordering to change. Returns 0 upon success or a
1143 * negative error code upon error.
1145 static int _get_addr_space_by_name(struct omap_hwmod
*oh
, const char *name
,
1146 u32
*pa_start
, u32
*pa_end
)
1149 struct omap_hwmod_ocp_if
*os
;
1150 struct list_head
*p
= NULL
;
1153 p
= oh
->slave_ports
.next
;
1156 while (i
< oh
->slaves_cnt
) {
1157 os
= _fetch_next_ocp_if(&p
, &i
);
1163 while (os
->addr
[j
].pa_start
!= os
->addr
[j
].pa_end
) {
1164 if (name
== os
->addr
[j
].name
||
1165 !strcmp(name
, os
->addr
[j
].name
)) {
1179 *pa_start
= os
->addr
[j
].pa_start
;
1180 *pa_end
= os
->addr
[j
].pa_end
;
1186 * _save_mpu_port_index - find and save the index to @oh's MPU port
1187 * @oh: struct omap_hwmod *
1189 * Determines the array index of the OCP slave port that the MPU uses
1190 * to address the device, and saves it into the struct omap_hwmod.
1191 * Intended to be called during hwmod registration only. No return
1194 static void __init
_save_mpu_port_index(struct omap_hwmod
*oh
)
1196 struct omap_hwmod_ocp_if
*os
= NULL
;
1197 struct list_head
*p
;
1203 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1205 p
= oh
->slave_ports
.next
;
1207 while (i
< oh
->slaves_cnt
) {
1208 os
= _fetch_next_ocp_if(&p
, &i
);
1209 if (os
->user
& OCP_USER_MPU
) {
1211 oh
->_int_flags
&= ~_HWMOD_NO_MPU_PORT
;
1220 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1221 * @oh: struct omap_hwmod *
1223 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1224 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1225 * communicate with the IP block. This interface need not be directly
1226 * connected to the MPU (and almost certainly is not), but is directly
1227 * connected to the IP block represented by @oh. Returns a pointer
1228 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1229 * error or if there does not appear to be a path from the MPU to this
1232 static struct omap_hwmod_ocp_if
*_find_mpu_rt_port(struct omap_hwmod
*oh
)
1234 if (!oh
|| oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| oh
->slaves_cnt
== 0)
1237 return oh
->_mpu_port
;
1241 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1242 * @oh: struct omap_hwmod *
1244 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1245 * the register target MPU address space; or returns NULL upon error.
1247 static struct omap_hwmod_addr_space
* __init
_find_mpu_rt_addr_space(struct omap_hwmod
*oh
)
1249 struct omap_hwmod_ocp_if
*os
;
1250 struct omap_hwmod_addr_space
*mem
;
1251 int found
= 0, i
= 0;
1253 os
= _find_mpu_rt_port(oh
);
1254 if (!os
|| !os
->addr
)
1258 mem
= &os
->addr
[i
++];
1259 if (mem
->flags
& ADDR_TYPE_RT
)
1261 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
1263 return (found
) ? mem
: NULL
;
1267 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1268 * @oh: struct omap_hwmod *
1270 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1271 * by @oh is set to indicate to the PRCM that the IP block is active.
1272 * Usually this means placing the module into smart-idle mode and
1273 * smart-standby, but if there is a bug in the automatic idle handling
1274 * for the IP block, it may need to be placed into the force-idle or
1275 * no-idle variants of these modes. No return value.
1277 static void _enable_sysc(struct omap_hwmod
*oh
)
1283 if (!oh
->class->sysc
)
1286 v
= oh
->_sysc_cache
;
1287 sf
= oh
->class->sysc
->sysc_flags
;
1289 if (sf
& SYSC_HAS_SIDLEMODE
) {
1290 clkdm_act
= ((oh
->clkdm
&&
1291 oh
->clkdm
->flags
& CLKDM_ACTIVE_WITH_MPU
) ||
1292 (oh
->_clk
&& oh
->_clk
->clkdm
&&
1293 oh
->_clk
->clkdm
->flags
& CLKDM_ACTIVE_WITH_MPU
));
1294 if (clkdm_act
&& !(oh
->class->sysc
->idlemodes
&
1295 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1296 idlemode
= HWMOD_IDLEMODE_FORCE
;
1298 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
1299 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
1300 _set_slave_idlemode(oh
, idlemode
, &v
);
1303 if (sf
& SYSC_HAS_MIDLEMODE
) {
1304 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1305 idlemode
= HWMOD_IDLEMODE_NO
;
1307 if (sf
& SYSC_HAS_ENAWAKEUP
)
1308 _enable_wakeup(oh
, &v
);
1309 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1310 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1312 idlemode
= HWMOD_IDLEMODE_SMART
;
1314 _set_master_standbymode(oh
, idlemode
, &v
);
1318 * XXX The clock framework should handle this, by
1319 * calling into this code. But this must wait until the
1320 * clock structures are tagged with omap_hwmod entries
1322 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
1323 (sf
& SYSC_HAS_CLOCKACTIVITY
))
1324 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
1326 /* If slave is in SMARTIDLE, also enable wakeup */
1327 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1328 _enable_wakeup(oh
, &v
);
1330 _write_sysconfig(v
, oh
);
1333 * Set the autoidle bit only after setting the smartidle bit
1334 * Setting this will not have any impact on the other modules.
1336 if (sf
& SYSC_HAS_AUTOIDLE
) {
1337 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
1339 _set_module_autoidle(oh
, idlemode
, &v
);
1340 _write_sysconfig(v
, oh
);
1345 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1346 * @oh: struct omap_hwmod *
1348 * If module is marked as SWSUP_SIDLE, force the module into slave
1349 * idle; otherwise, configure it for smart-idle. If module is marked
1350 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1351 * configure it for smart-standby. No return value.
1353 static void _idle_sysc(struct omap_hwmod
*oh
)
1358 if (!oh
->class->sysc
)
1361 v
= oh
->_sysc_cache
;
1362 sf
= oh
->class->sysc
->sysc_flags
;
1364 if (sf
& SYSC_HAS_SIDLEMODE
) {
1365 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1366 if (oh
->flags
& HWMOD_SWSUP_SIDLE
||
1367 !(oh
->class->sysc
->idlemodes
&
1368 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1369 idlemode
= HWMOD_IDLEMODE_FORCE
;
1371 idlemode
= HWMOD_IDLEMODE_SMART
;
1372 _set_slave_idlemode(oh
, idlemode
, &v
);
1375 if (sf
& SYSC_HAS_MIDLEMODE
) {
1376 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1377 idlemode
= HWMOD_IDLEMODE_FORCE
;
1379 if (sf
& SYSC_HAS_ENAWAKEUP
)
1380 _enable_wakeup(oh
, &v
);
1381 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1382 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1384 idlemode
= HWMOD_IDLEMODE_SMART
;
1386 _set_master_standbymode(oh
, idlemode
, &v
);
1389 /* If slave is in SMARTIDLE, also enable wakeup */
1390 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1391 _enable_wakeup(oh
, &v
);
1393 _write_sysconfig(v
, oh
);
1397 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1398 * @oh: struct omap_hwmod *
1400 * Force the module into slave idle and master suspend. No return
1403 static void _shutdown_sysc(struct omap_hwmod
*oh
)
1408 if (!oh
->class->sysc
)
1411 v
= oh
->_sysc_cache
;
1412 sf
= oh
->class->sysc
->sysc_flags
;
1414 if (sf
& SYSC_HAS_SIDLEMODE
)
1415 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1417 if (sf
& SYSC_HAS_MIDLEMODE
)
1418 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1420 if (sf
& SYSC_HAS_AUTOIDLE
)
1421 _set_module_autoidle(oh
, 1, &v
);
1423 _write_sysconfig(v
, oh
);
1427 * _lookup - find an omap_hwmod by name
1428 * @name: find an omap_hwmod by name
1430 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1432 static struct omap_hwmod
*_lookup(const char *name
)
1434 struct omap_hwmod
*oh
, *temp_oh
;
1438 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1439 if (!strcmp(name
, temp_oh
->name
)) {
1449 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1450 * @oh: struct omap_hwmod *
1452 * Convert a clockdomain name stored in a struct omap_hwmod into a
1453 * clockdomain pointer, and save it into the struct omap_hwmod.
1454 * Return -EINVAL if the clkdm_name lookup failed.
1456 static int _init_clkdm(struct omap_hwmod
*oh
)
1458 if (!oh
->clkdm_name
) {
1459 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh
->name
);
1463 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1465 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1466 oh
->name
, oh
->clkdm_name
);
1470 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1471 oh
->name
, oh
->clkdm_name
);
1477 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1478 * well the clockdomain.
1479 * @oh: struct omap_hwmod *
1480 * @data: not used; pass NULL
1482 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1483 * Resolves all clock names embedded in the hwmod. Returns 0 on
1484 * success, or a negative error code on failure.
1486 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1490 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1493 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1495 ret
|= _init_main_clk(oh
);
1496 ret
|= _init_interface_clks(oh
);
1497 ret
|= _init_opt_clks(oh
);
1498 if (soc_ops
.init_clkdm
)
1499 ret
|= soc_ops
.init_clkdm(oh
);
1502 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1504 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1510 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1511 * @oh: struct omap_hwmod *
1512 * @name: name of the reset line in the context of this hwmod
1513 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1515 * Return the bit position of the reset line that match the
1516 * input name. Return -ENOENT if not found.
1518 static int _lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1519 struct omap_hwmod_rst_info
*ohri
)
1523 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1524 const char *rst_line
= oh
->rst_lines
[i
].name
;
1525 if (!strcmp(rst_line
, name
)) {
1526 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1527 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1528 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1529 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1540 * _assert_hardreset - assert the HW reset line of submodules
1541 * contained in the hwmod module.
1542 * @oh: struct omap_hwmod *
1543 * @name: name of the reset line to lookup and assert
1545 * Some IP like dsp, ipu or iva contain processor that require an HW
1546 * reset line to be assert / deassert in order to enable fully the IP.
1547 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1548 * asserting the hardreset line on the currently-booted SoC, or passes
1549 * along the return value from _lookup_hardreset() or the SoC's
1550 * assert_hardreset code.
1552 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1554 struct omap_hwmod_rst_info ohri
;
1560 if (!soc_ops
.assert_hardreset
)
1563 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1567 ret
= soc_ops
.assert_hardreset(oh
, &ohri
);
1573 * _deassert_hardreset - deassert the HW reset line of submodules contained
1574 * in the hwmod module.
1575 * @oh: struct omap_hwmod *
1576 * @name: name of the reset line to look up and deassert
1578 * Some IP like dsp, ipu or iva contain processor that require an HW
1579 * reset line to be assert / deassert in order to enable fully the IP.
1580 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1581 * deasserting the hardreset line on the currently-booted SoC, or passes
1582 * along the return value from _lookup_hardreset() or the SoC's
1583 * deassert_hardreset code.
1585 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1587 struct omap_hwmod_rst_info ohri
;
1594 if (!soc_ops
.deassert_hardreset
)
1597 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1598 if (IS_ERR_VALUE(ret
))
1603 * A clockdomain must be in SW_SUP otherwise reset
1604 * might not be completed. The clockdomain can be set
1605 * in HW_AUTO only when the module become ready.
1607 hwsup
= clkdm_in_hwsup(oh
->clkdm
);
1608 ret
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
1610 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1611 oh
->name
, oh
->clkdm
->name
, ret
);
1617 if (soc_ops
.enable_module
)
1618 soc_ops
.enable_module(oh
);
1620 ret
= soc_ops
.deassert_hardreset(oh
, &ohri
);
1622 if (soc_ops
.disable_module
)
1623 soc_ops
.disable_module(oh
);
1624 _disable_clocks(oh
);
1627 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1631 * Set the clockdomain to HW_AUTO, assuming that the
1632 * previous state was HW_AUTO.
1634 if (oh
->clkdm
&& hwsup
)
1635 clkdm_allow_idle(oh
->clkdm
);
1638 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1645 * _read_hardreset - read the HW reset line state of submodules
1646 * contained in the hwmod module
1647 * @oh: struct omap_hwmod *
1648 * @name: name of the reset line to look up and read
1650 * Return the state of the reset line. Returns -EINVAL if @oh is
1651 * null, -ENOSYS if we have no way of reading the hardreset line
1652 * status on the currently-booted SoC, or passes along the return
1653 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1656 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1658 struct omap_hwmod_rst_info ohri
;
1664 if (!soc_ops
.is_hardreset_asserted
)
1667 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1671 return soc_ops
.is_hardreset_asserted(oh
, &ohri
);
1675 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1676 * @oh: struct omap_hwmod *
1678 * If all hardreset lines associated with @oh are asserted, then return true.
1679 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1680 * associated with @oh are asserted, then return false.
1681 * This function is used to avoid executing some parts of the IP block
1682 * enable/disable sequence if its hardreset line is set.
1684 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1688 if (oh
->rst_lines_cnt
== 0)
1691 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1692 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1695 if (oh
->rst_lines_cnt
== rst_cnt
)
1702 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1704 * @oh: struct omap_hwmod *
1706 * If any hardreset lines associated with @oh are asserted, then
1707 * return true. Otherwise, if no hardreset lines associated with @oh
1708 * are asserted, or if @oh has no hardreset lines, then return false.
1709 * This function is used to avoid executing some parts of the IP block
1710 * enable/disable sequence if any hardreset line is set.
1712 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1717 for (i
= 0; i
< oh
->rst_lines_cnt
&& rst_cnt
== 0; i
++)
1718 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1721 return (rst_cnt
) ? true : false;
1725 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1726 * @oh: struct omap_hwmod *
1728 * Disable the PRCM module mode related to the hwmod @oh.
1729 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1731 static int _omap4_disable_module(struct omap_hwmod
*oh
)
1735 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1739 * Since integration code might still be doing something, only
1740 * disable if all lines are under hardreset.
1742 if (_are_any_hardreset_lines_asserted(oh
))
1745 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1747 omap4_cminst_module_disable(oh
->clkdm
->prcm_partition
,
1749 oh
->clkdm
->clkdm_offs
,
1750 oh
->prcm
.omap4
.clkctrl_offs
);
1752 v
= _omap4_wait_target_disable(oh
);
1754 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1761 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1762 * @oh: struct omap_hwmod *
1764 * Disable the PRCM module mode related to the hwmod @oh.
1765 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1767 static int _am33xx_disable_module(struct omap_hwmod
*oh
)
1771 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1774 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1776 if (_are_any_hardreset_lines_asserted(oh
))
1779 am33xx_cm_module_disable(oh
->clkdm
->cm_inst
, oh
->clkdm
->clkdm_offs
,
1780 oh
->prcm
.omap4
.clkctrl_offs
);
1782 v
= _am33xx_wait_target_disable(oh
);
1784 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1791 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1792 * @oh: struct omap_hwmod *
1794 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1795 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1796 * reset this way, -EINVAL if the hwmod is in the wrong state,
1797 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1799 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1800 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1801 * use the SYSCONFIG softreset bit to provide the status.
1803 * Note that some IP like McBSP do have reset control but don't have
1806 static int _ocp_softreset(struct omap_hwmod
*oh
)
1808 u32 v
, softrst_mask
;
1812 if (!oh
->class->sysc
||
1813 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1816 /* clocks must be on for this operation */
1817 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1818 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1823 /* For some modules, all optionnal clocks need to be enabled as well */
1824 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1825 _enable_optional_clocks(oh
);
1827 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1829 v
= oh
->_sysc_cache
;
1830 ret
= _set_softreset(oh
, &v
);
1833 _write_sysconfig(v
, oh
);
1835 if (oh
->class->sysc
->srst_udelay
)
1836 udelay(oh
->class->sysc
->srst_udelay
);
1838 if (oh
->class->sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
1839 omap_test_timeout((omap_hwmod_read(oh
,
1840 oh
->class->sysc
->syss_offs
)
1841 & SYSS_RESETDONE_MASK
),
1842 MAX_MODULE_SOFTRESET_WAIT
, c
);
1843 else if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
) {
1844 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
1845 omap_test_timeout(!(omap_hwmod_read(oh
,
1846 oh
->class->sysc
->sysc_offs
)
1848 MAX_MODULE_SOFTRESET_WAIT
, c
);
1851 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1852 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1853 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1855 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1858 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1859 * _wait_target_ready() or _reset()
1862 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1865 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1866 _disable_optional_clocks(oh
);
1872 * _reset - reset an omap_hwmod
1873 * @oh: struct omap_hwmod *
1875 * Resets an omap_hwmod @oh. If the module has a custom reset
1876 * function pointer defined, then call it to reset the IP block, and
1877 * pass along its return value to the caller. Otherwise, if the IP
1878 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1879 * associated with it, call a function to reset the IP block via that
1880 * method, and pass along the return value to the caller. Finally, if
1881 * the IP block has some hardreset lines associated with it, assert
1882 * all of those, but do _not_ deassert them. (This is because driver
1883 * authors have expressed an apparent requirement to control the
1884 * deassertion of the hardreset lines themselves.)
1886 * The default software reset mechanism for most OMAP IP blocks is
1887 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1888 * hwmods cannot be reset via this method. Some are not targets and
1889 * therefore have no OCP header registers to access. Others (like the
1890 * IVA) have idiosyncratic reset sequences. So for these relatively
1891 * rare cases, custom reset code can be supplied in the struct
1892 * omap_hwmod_class .reset function pointer.
1894 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1895 * does not prevent idling of the system. This is necessary for cases
1896 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1897 * kernel without disabling dma.
1899 * Passes along the return value from either _ocp_softreset() or the
1900 * custom reset function - these must return -EINVAL if the hwmod
1901 * cannot be reset this way or if the hwmod is in the wrong state,
1902 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1904 static int _reset(struct omap_hwmod
*oh
)
1908 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1910 if (oh
->class->reset
) {
1911 r
= oh
->class->reset(oh
);
1913 if (oh
->rst_lines_cnt
> 0) {
1914 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1915 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
1918 r
= _ocp_softreset(oh
);
1924 _set_dmadisable(oh
);
1927 * OCP_SYSCONFIG bits need to be reprogrammed after a
1928 * softreset. The _enable() function should be split to avoid
1929 * the rewrite of the OCP_SYSCONFIG register.
1931 if (oh
->class->sysc
) {
1932 _update_sysc_cache(oh
);
1940 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
1942 * Call the appropriate PRM function to clear any logged I/O chain
1943 * wakeups and to reconfigure the chain. This apparently needs to be
1944 * done upon every mux change. Since hwmods can be concurrently
1945 * enabled and idled, hold a spinlock around the I/O chain
1946 * reconfiguration sequence. No return value.
1948 * XXX When the PRM code is moved to drivers, this function can be removed,
1949 * as the PRM infrastructure should abstract this.
1951 static void _reconfigure_io_chain(void)
1953 unsigned long flags
;
1955 spin_lock_irqsave(&io_chain_lock
, flags
);
1957 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
1958 omap3xxx_prm_reconfigure_io_chain();
1959 else if (cpu_is_omap44xx())
1960 omap44xx_prm_reconfigure_io_chain();
1962 spin_unlock_irqrestore(&io_chain_lock
, flags
);
1966 * _enable - enable an omap_hwmod
1967 * @oh: struct omap_hwmod *
1969 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1970 * register target. Returns -EINVAL if the hwmod is in the wrong
1971 * state or passes along the return value of _wait_target_ready().
1973 static int _enable(struct omap_hwmod
*oh
)
1978 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
1981 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1982 * state at init. Now that someone is really trying to enable
1983 * them, just ensure that the hwmod mux is set.
1985 if (oh
->_int_flags
& _HWMOD_SKIP_ENABLE
) {
1987 * If the caller has mux data populated, do the mux'ing
1988 * which wouldn't have been done as part of the _enable()
1989 * done during setup.
1992 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
1994 oh
->_int_flags
&= ~_HWMOD_SKIP_ENABLE
;
1998 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
1999 oh
->_state
!= _HWMOD_STATE_IDLE
&&
2000 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
2001 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2007 * If an IP block contains HW reset lines and all of them are
2008 * asserted, we let integration code associated with that
2009 * block handle the enable. We've received very little
2010 * information on what those driver authors need, and until
2011 * detailed information is provided and the driver code is
2012 * posted to the public lists, this is probably the best we
2015 if (_are_all_hardreset_lines_asserted(oh
))
2018 /* Mux pins for device runtime if populated */
2019 if (oh
->mux
&& (!oh
->mux
->enabled
||
2020 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
2021 oh
->mux
->pads_dynamic
))) {
2022 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2023 _reconfigure_io_chain();
2026 _add_initiator_dep(oh
, mpu_oh
);
2030 * A clockdomain must be in SW_SUP before enabling
2031 * completely the module. The clockdomain can be set
2032 * in HW_AUTO only when the module become ready.
2034 hwsup
= clkdm_in_hwsup(oh
->clkdm
) &&
2035 !clkdm_missing_idle_reporting(oh
->clkdm
);
2036 r
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
2038 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2039 oh
->name
, oh
->clkdm
->name
, r
);
2045 if (soc_ops
.enable_module
)
2046 soc_ops
.enable_module(oh
);
2048 r
= (soc_ops
.wait_target_ready
) ? soc_ops
.wait_target_ready(oh
) :
2052 * Set the clockdomain to HW_AUTO only if the target is ready,
2053 * assuming that the previous state was HW_AUTO
2055 if (oh
->clkdm
&& hwsup
)
2056 clkdm_allow_idle(oh
->clkdm
);
2058 oh
->_state
= _HWMOD_STATE_ENABLED
;
2060 /* Access the sysconfig only if the target is ready */
2061 if (oh
->class->sysc
) {
2062 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
2063 _update_sysc_cache(oh
);
2067 _omap4_disable_module(oh
);
2068 _disable_clocks(oh
);
2069 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2073 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2080 * _idle - idle an omap_hwmod
2081 * @oh: struct omap_hwmod *
2083 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2084 * no further work. Returns -EINVAL if the hwmod is in the wrong
2085 * state or returns 0.
2087 static int _idle(struct omap_hwmod
*oh
)
2089 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
2091 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2092 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2097 if (_are_all_hardreset_lines_asserted(oh
))
2100 if (oh
->class->sysc
)
2102 _del_initiator_dep(oh
, mpu_oh
);
2104 if (soc_ops
.disable_module
)
2105 soc_ops
.disable_module(oh
);
2108 * The module must be in idle mode before disabling any parents
2109 * clocks. Otherwise, the parent clock might be disabled before
2110 * the module transition is done, and thus will prevent the
2111 * transition to complete properly.
2113 _disable_clocks(oh
);
2115 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2117 /* Mux pins for device idle if populated */
2118 if (oh
->mux
&& oh
->mux
->pads_dynamic
) {
2119 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
2120 _reconfigure_io_chain();
2123 oh
->_state
= _HWMOD_STATE_IDLE
;
2129 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2130 * @oh: struct omap_hwmod *
2131 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2133 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2134 * local copy. Intended to be used by drivers that require
2135 * direct manipulation of the AUTOIDLE bits.
2136 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2137 * along the return value from _set_module_autoidle().
2139 * Any users of this function should be scrutinized carefully.
2141 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod
*oh
, u8 autoidle
)
2145 unsigned long flags
;
2147 if (!oh
|| oh
->_state
!= _HWMOD_STATE_ENABLED
)
2150 spin_lock_irqsave(&oh
->_lock
, flags
);
2152 v
= oh
->_sysc_cache
;
2154 retval
= _set_module_autoidle(oh
, autoidle
, &v
);
2157 _write_sysconfig(v
, oh
);
2159 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2165 * _shutdown - shutdown an omap_hwmod
2166 * @oh: struct omap_hwmod *
2168 * Shut down an omap_hwmod @oh. This should be called when the driver
2169 * used for the hwmod is removed or unloaded or if the driver is not
2170 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2171 * state or returns 0.
2173 static int _shutdown(struct omap_hwmod
*oh
)
2178 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
2179 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2180 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2185 if (_are_all_hardreset_lines_asserted(oh
))
2188 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
2190 if (oh
->class->pre_shutdown
) {
2191 prev_state
= oh
->_state
;
2192 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2194 ret
= oh
->class->pre_shutdown(oh
);
2196 if (prev_state
== _HWMOD_STATE_IDLE
)
2202 if (oh
->class->sysc
) {
2203 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2208 /* clocks and deps are already disabled in idle */
2209 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
2210 _del_initiator_dep(oh
, mpu_oh
);
2211 /* XXX what about the other system initiators here? dma, dsp */
2212 if (soc_ops
.disable_module
)
2213 soc_ops
.disable_module(oh
);
2214 _disable_clocks(oh
);
2216 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2218 /* XXX Should this code also force-disable the optional clocks? */
2220 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
2221 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
2223 /* Mux pins to safe mode or use populated off mode values */
2225 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
2227 oh
->_state
= _HWMOD_STATE_DISABLED
;
2233 * _init_mpu_rt_base - populate the virtual address for a hwmod
2234 * @oh: struct omap_hwmod * to locate the virtual address
2236 * Cache the virtual address used by the MPU to access this IP block's
2237 * registers. This address is needed early so the OCP registers that
2238 * are part of the device's address space can be ioremapped properly.
2241 static void __init
_init_mpu_rt_base(struct omap_hwmod
*oh
, void *data
)
2243 struct omap_hwmod_addr_space
*mem
;
2244 void __iomem
*va_start
;
2249 _save_mpu_port_index(oh
);
2251 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2254 mem
= _find_mpu_rt_addr_space(oh
);
2256 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2261 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
2263 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
2267 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2268 oh
->name
, va_start
);
2270 oh
->_mpu_rt_va
= va_start
;
2274 * _init - initialize internal data for the hwmod @oh
2275 * @oh: struct omap_hwmod *
2278 * Look up the clocks and the address space used by the MPU to access
2279 * registers belonging to the hwmod @oh. @oh must already be
2280 * registered at this point. This is the first of two phases for
2281 * hwmod initialization. Code called here does not touch any hardware
2282 * registers, it simply prepares internal data structures. Returns 0
2283 * upon success or if the hwmod isn't registered, or -EINVAL upon
2286 static int __init
_init(struct omap_hwmod
*oh
, void *data
)
2290 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
2293 _init_mpu_rt_base(oh
, NULL
);
2295 r
= _init_clocks(oh
, NULL
);
2296 if (IS_ERR_VALUE(r
)) {
2297 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh
->name
);
2301 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
2307 * _setup_iclk_autoidle - configure an IP block's interface clocks
2308 * @oh: struct omap_hwmod *
2310 * Set up the module's interface clocks. XXX This function is still mostly
2311 * a stub; implementing this properly requires iclk autoidle usecounting in
2312 * the clock code. No return value.
2314 static void __init
_setup_iclk_autoidle(struct omap_hwmod
*oh
)
2316 struct omap_hwmod_ocp_if
*os
;
2317 struct list_head
*p
;
2319 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2322 p
= oh
->slave_ports
.next
;
2324 while (i
< oh
->slaves_cnt
) {
2325 os
= _fetch_next_ocp_if(&p
, &i
);
2329 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
2330 /* XXX omap_iclk_deny_idle(c); */
2332 /* XXX omap_iclk_allow_idle(c); */
2333 clk_enable(os
->_clk
);
2341 * _setup_reset - reset an IP block during the setup process
2342 * @oh: struct omap_hwmod *
2344 * Reset the IP block corresponding to the hwmod @oh during the setup
2345 * process. The IP block is first enabled so it can be successfully
2346 * reset. Returns 0 upon success or a negative error code upon
2349 static int __init
_setup_reset(struct omap_hwmod
*oh
)
2353 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2356 if (oh
->rst_lines_cnt
== 0) {
2359 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2360 oh
->name
, oh
->_state
);
2365 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
))
2372 * _setup_postsetup - transition to the appropriate state after _setup
2373 * @oh: struct omap_hwmod *
2375 * Place an IP block represented by @oh into a "post-setup" state --
2376 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2377 * this function is called at the end of _setup().) The postsetup
2378 * state for an IP block can be changed by calling
2379 * omap_hwmod_enter_postsetup_state() early in the boot process,
2380 * before one of the omap_hwmod_setup*() functions are called for the
2383 * The IP block stays in this state until a PM runtime-based driver is
2384 * loaded for that IP block. A post-setup state of IDLE is
2385 * appropriate for almost all IP blocks with runtime PM-enabled
2386 * drivers, since those drivers are able to enable the IP block. A
2387 * post-setup state of ENABLED is appropriate for kernels with PM
2388 * runtime disabled. The DISABLED state is appropriate for unusual IP
2389 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2390 * included, since the WDTIMER starts running on reset and will reset
2391 * the MPU if left active.
2393 * This post-setup mechanism is deprecated. Once all of the OMAP
2394 * drivers have been converted to use PM runtime, and all of the IP
2395 * block data and interconnect data is available to the hwmod code, it
2396 * should be possible to replace this mechanism with a "lazy reset"
2397 * arrangement. In a "lazy reset" setup, each IP block is enabled
2398 * when the driver first probes, then all remaining IP blocks without
2399 * drivers are either shut down or enabled after the drivers have
2400 * loaded. However, this cannot take place until the above
2401 * preconditions have been met, since otherwise the late reset code
2402 * has no way of knowing which IP blocks are in use by drivers, and
2403 * which ones are unused.
2407 static void __init
_setup_postsetup(struct omap_hwmod
*oh
)
2411 if (oh
->rst_lines_cnt
> 0)
2414 postsetup_state
= oh
->_postsetup_state
;
2415 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
2416 postsetup_state
= _HWMOD_STATE_ENABLED
;
2419 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2420 * it should be set by the core code as a runtime flag during startup
2422 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
2423 (postsetup_state
== _HWMOD_STATE_IDLE
)) {
2424 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2425 postsetup_state
= _HWMOD_STATE_ENABLED
;
2428 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2430 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2432 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2433 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2434 oh
->name
, postsetup_state
);
2440 * _setup - prepare IP block hardware for use
2441 * @oh: struct omap_hwmod *
2442 * @n: (unused, pass NULL)
2444 * Configure the IP block represented by @oh. This may include
2445 * enabling the IP block, resetting it, and placing it into a
2446 * post-setup state, depending on the type of IP block and applicable
2447 * flags. IP blocks are reset to prevent any previous configuration
2448 * by the bootloader or previous operating system from interfering
2449 * with power management or other parts of the system. The reset can
2450 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2451 * two phases for hwmod initialization. Code called here generally
2452 * affects the IP block hardware, or system integration hardware
2453 * associated with the IP block. Returns 0.
2455 static int __init
_setup(struct omap_hwmod
*oh
, void *data
)
2457 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2460 _setup_iclk_autoidle(oh
);
2462 if (!_setup_reset(oh
))
2463 _setup_postsetup(oh
);
2469 * _register - register a struct omap_hwmod
2470 * @oh: struct omap_hwmod *
2472 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2473 * already has been registered by the same name; -EINVAL if the
2474 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2475 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2476 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2479 * XXX The data should be copied into bootmem, so the original data
2480 * should be marked __initdata and freed after init. This would allow
2481 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2482 * that the copy process would be relatively complex due to the large number
2485 static int __init
_register(struct omap_hwmod
*oh
)
2487 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
2488 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
2491 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
2493 if (_lookup(oh
->name
))
2496 list_add_tail(&oh
->node
, &omap_hwmod_list
);
2498 INIT_LIST_HEAD(&oh
->master_ports
);
2499 INIT_LIST_HEAD(&oh
->slave_ports
);
2500 spin_lock_init(&oh
->_lock
);
2502 oh
->_state
= _HWMOD_STATE_REGISTERED
;
2505 * XXX Rather than doing a strcmp(), this should test a flag
2506 * set in the hwmod data, inserted by the autogenerator code.
2508 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
2515 * _alloc_links - return allocated memory for hwmod links
2516 * @ml: pointer to a struct omap_hwmod_link * for the master link
2517 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2519 * Return pointers to two struct omap_hwmod_link records, via the
2520 * addresses pointed to by @ml and @sl. Will first attempt to return
2521 * memory allocated as part of a large initial block, but if that has
2522 * been exhausted, will allocate memory itself. Since ideally this
2523 * second allocation path will never occur, the number of these
2524 * 'supplemental' allocations will be logged when debugging is
2525 * enabled. Returns 0.
2527 static int __init
_alloc_links(struct omap_hwmod_link
**ml
,
2528 struct omap_hwmod_link
**sl
)
2532 if ((free_ls
+ LINKS_PER_OCP_IF
) <= max_ls
) {
2533 *ml
= &linkspace
[free_ls
++];
2534 *sl
= &linkspace
[free_ls
++];
2538 sz
= sizeof(struct omap_hwmod_link
) * LINKS_PER_OCP_IF
;
2541 *ml
= alloc_bootmem(sz
);
2545 *sl
= (void *)(*ml
) + sizeof(struct omap_hwmod_link
);
2548 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2549 ls_supp
* LINKS_PER_OCP_IF
);
2555 * _add_link - add an interconnect between two IP blocks
2556 * @oi: pointer to a struct omap_hwmod_ocp_if record
2558 * Add struct omap_hwmod_link records connecting the master IP block
2559 * specified in @oi->master to @oi, and connecting the slave IP block
2560 * specified in @oi->slave to @oi. This code is assumed to run before
2561 * preemption or SMP has been enabled, thus avoiding the need for
2562 * locking in this code. Changes to this assumption will require
2563 * additional locking. Returns 0.
2565 static int __init
_add_link(struct omap_hwmod_ocp_if
*oi
)
2567 struct omap_hwmod_link
*ml
, *sl
;
2569 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi
->master
->name
,
2572 _alloc_links(&ml
, &sl
);
2575 INIT_LIST_HEAD(&ml
->node
);
2576 list_add(&ml
->node
, &oi
->master
->master_ports
);
2577 oi
->master
->masters_cnt
++;
2580 INIT_LIST_HEAD(&sl
->node
);
2581 list_add(&sl
->node
, &oi
->slave
->slave_ports
);
2582 oi
->slave
->slaves_cnt
++;
2588 * _register_link - register a struct omap_hwmod_ocp_if
2589 * @oi: struct omap_hwmod_ocp_if *
2591 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2592 * has already been registered; -EINVAL if @oi is NULL or if the
2593 * record pointed to by @oi is missing required fields; or 0 upon
2596 * XXX The data should be copied into bootmem, so the original data
2597 * should be marked __initdata and freed after init. This would allow
2598 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2600 static int __init
_register_link(struct omap_hwmod_ocp_if
*oi
)
2602 if (!oi
|| !oi
->master
|| !oi
->slave
|| !oi
->user
)
2605 if (oi
->_int_flags
& _OCPIF_INT_FLAGS_REGISTERED
)
2608 pr_debug("omap_hwmod: registering link from %s to %s\n",
2609 oi
->master
->name
, oi
->slave
->name
);
2612 * Register the connected hwmods, if they haven't been
2613 * registered already
2615 if (oi
->master
->_state
!= _HWMOD_STATE_REGISTERED
)
2616 _register(oi
->master
);
2618 if (oi
->slave
->_state
!= _HWMOD_STATE_REGISTERED
)
2619 _register(oi
->slave
);
2623 oi
->_int_flags
|= _OCPIF_INT_FLAGS_REGISTERED
;
2629 * _alloc_linkspace - allocate large block of hwmod links
2630 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2632 * Allocate a large block of struct omap_hwmod_link records. This
2633 * improves boot time significantly by avoiding the need to allocate
2634 * individual records one by one. If the number of records to
2635 * allocate in the block hasn't been manually specified, this function
2636 * will count the number of struct omap_hwmod_ocp_if records in @ois
2637 * and use that to determine the allocation size. For SoC families
2638 * that require multiple list registrations, such as OMAP3xxx, this
2639 * estimation process isn't optimal, so manual estimation is advised
2640 * in those cases. Returns -EEXIST if the allocation has already occurred
2641 * or 0 upon success.
2643 static int __init
_alloc_linkspace(struct omap_hwmod_ocp_if
**ois
)
2649 WARN(1, "linkspace already allocated\n");
2655 max_ls
+= LINKS_PER_OCP_IF
;
2657 sz
= sizeof(struct omap_hwmod_link
) * max_ls
;
2659 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2660 __func__
, sz
, max_ls
);
2662 linkspace
= alloc_bootmem(sz
);
2664 memset(linkspace
, 0, sz
);
2669 /* Static functions intended only for use in soc_ops field function pointers */
2672 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2673 * @oh: struct omap_hwmod *
2675 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2676 * does not have an IDLEST bit or if the module successfully leaves
2677 * slave idle; otherwise, pass along the return value of the
2678 * appropriate *_cm*_wait_module_ready() function.
2680 static int _omap2xxx_wait_target_ready(struct omap_hwmod
*oh
)
2685 if (oh
->flags
& HWMOD_NO_IDLEST
)
2688 if (!_find_mpu_rt_port(oh
))
2691 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2693 return omap2xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2694 oh
->prcm
.omap2
.idlest_reg_id
,
2695 oh
->prcm
.omap2
.idlest_idle_bit
);
2699 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2700 * @oh: struct omap_hwmod *
2702 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2703 * does not have an IDLEST bit or if the module successfully leaves
2704 * slave idle; otherwise, pass along the return value of the
2705 * appropriate *_cm*_wait_module_ready() function.
2707 static int _omap3xxx_wait_target_ready(struct omap_hwmod
*oh
)
2712 if (oh
->flags
& HWMOD_NO_IDLEST
)
2715 if (!_find_mpu_rt_port(oh
))
2718 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2720 return omap3xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2721 oh
->prcm
.omap2
.idlest_reg_id
,
2722 oh
->prcm
.omap2
.idlest_idle_bit
);
2726 * _omap4_wait_target_ready - wait for a module to leave slave idle
2727 * @oh: struct omap_hwmod *
2729 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2730 * does not have an IDLEST bit or if the module successfully leaves
2731 * slave idle; otherwise, pass along the return value of the
2732 * appropriate *_cm*_wait_module_ready() function.
2734 static int _omap4_wait_target_ready(struct omap_hwmod
*oh
)
2739 if (oh
->flags
& HWMOD_NO_IDLEST
|| !oh
->clkdm
)
2742 if (!_find_mpu_rt_port(oh
))
2745 /* XXX check module SIDLEMODE, hardreset status */
2747 return omap4_cminst_wait_module_ready(oh
->clkdm
->prcm_partition
,
2749 oh
->clkdm
->clkdm_offs
,
2750 oh
->prcm
.omap4
.clkctrl_offs
);
2754 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2755 * @oh: struct omap_hwmod *
2757 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2758 * does not have an IDLEST bit or if the module successfully leaves
2759 * slave idle; otherwise, pass along the return value of the
2760 * appropriate *_cm*_wait_module_ready() function.
2762 static int _am33xx_wait_target_ready(struct omap_hwmod
*oh
)
2764 if (!oh
|| !oh
->clkdm
)
2767 if (oh
->flags
& HWMOD_NO_IDLEST
)
2770 if (!_find_mpu_rt_port(oh
))
2773 /* XXX check module SIDLEMODE, hardreset status */
2775 return am33xx_cm_wait_module_ready(oh
->clkdm
->cm_inst
,
2776 oh
->clkdm
->clkdm_offs
,
2777 oh
->prcm
.omap4
.clkctrl_offs
);
2781 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2782 * @oh: struct omap_hwmod * to assert hardreset
2783 * @ohri: hardreset line data
2785 * Call omap2_prm_assert_hardreset() with parameters extracted from
2786 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2787 * use as an soc_ops function pointer. Passes along the return value
2788 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2789 * for removal when the PRM code is moved into drivers/.
2791 static int _omap2_assert_hardreset(struct omap_hwmod
*oh
,
2792 struct omap_hwmod_rst_info
*ohri
)
2794 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
2799 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2800 * @oh: struct omap_hwmod * to deassert hardreset
2801 * @ohri: hardreset line data
2803 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2804 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2805 * use as an soc_ops function pointer. Passes along the return value
2806 * from omap2_prm_deassert_hardreset(). XXX This function is
2807 * scheduled for removal when the PRM code is moved into drivers/.
2809 static int _omap2_deassert_hardreset(struct omap_hwmod
*oh
,
2810 struct omap_hwmod_rst_info
*ohri
)
2812 return omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
2818 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2819 * @oh: struct omap_hwmod * to test hardreset
2820 * @ohri: hardreset line data
2822 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2823 * from the hwmod @oh and the hardreset line data @ohri. Only
2824 * intended for use as an soc_ops function pointer. Passes along the
2825 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2826 * function is scheduled for removal when the PRM code is moved into
2829 static int _omap2_is_hardreset_asserted(struct omap_hwmod
*oh
,
2830 struct omap_hwmod_rst_info
*ohri
)
2832 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
2837 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2838 * @oh: struct omap_hwmod * to assert hardreset
2839 * @ohri: hardreset line data
2841 * Call omap4_prminst_assert_hardreset() with parameters extracted
2842 * from the hwmod @oh and the hardreset line data @ohri. Only
2843 * intended for use as an soc_ops function pointer. Passes along the
2844 * return value from omap4_prminst_assert_hardreset(). XXX This
2845 * function is scheduled for removal when the PRM code is moved into
2848 static int _omap4_assert_hardreset(struct omap_hwmod
*oh
,
2849 struct omap_hwmod_rst_info
*ohri
)
2854 return omap4_prminst_assert_hardreset(ohri
->rst_shift
,
2855 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2856 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2857 oh
->prcm
.omap4
.rstctrl_offs
);
2861 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2862 * @oh: struct omap_hwmod * to deassert hardreset
2863 * @ohri: hardreset line data
2865 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2866 * from the hwmod @oh and the hardreset line data @ohri. Only
2867 * intended for use as an soc_ops function pointer. Passes along the
2868 * return value from omap4_prminst_deassert_hardreset(). XXX This
2869 * function is scheduled for removal when the PRM code is moved into
2872 static int _omap4_deassert_hardreset(struct omap_hwmod
*oh
,
2873 struct omap_hwmod_rst_info
*ohri
)
2879 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2880 oh
->name
, ohri
->name
);
2881 return omap4_prminst_deassert_hardreset(ohri
->rst_shift
,
2882 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2883 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2884 oh
->prcm
.omap4
.rstctrl_offs
);
2888 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
2889 * @oh: struct omap_hwmod * to test hardreset
2890 * @ohri: hardreset line data
2892 * Call omap4_prminst_is_hardreset_asserted() with parameters
2893 * extracted from the hwmod @oh and the hardreset line data @ohri.
2894 * Only intended for use as an soc_ops function pointer. Passes along
2895 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
2896 * This function is scheduled for removal when the PRM code is moved
2899 static int _omap4_is_hardreset_asserted(struct omap_hwmod
*oh
,
2900 struct omap_hwmod_rst_info
*ohri
)
2905 return omap4_prminst_is_hardreset_asserted(ohri
->rst_shift
,
2906 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2907 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2908 oh
->prcm
.omap4
.rstctrl_offs
);
2912 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2913 * @oh: struct omap_hwmod * to assert hardreset
2914 * @ohri: hardreset line data
2916 * Call am33xx_prminst_assert_hardreset() with parameters extracted
2917 * from the hwmod @oh and the hardreset line data @ohri. Only
2918 * intended for use as an soc_ops function pointer. Passes along the
2919 * return value from am33xx_prminst_assert_hardreset(). XXX This
2920 * function is scheduled for removal when the PRM code is moved into
2923 static int _am33xx_assert_hardreset(struct omap_hwmod
*oh
,
2924 struct omap_hwmod_rst_info
*ohri
)
2927 return am33xx_prm_assert_hardreset(ohri
->rst_shift
,
2928 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2929 oh
->prcm
.omap4
.rstctrl_offs
);
2933 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
2934 * @oh: struct omap_hwmod * to deassert hardreset
2935 * @ohri: hardreset line data
2937 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
2938 * from the hwmod @oh and the hardreset line data @ohri. Only
2939 * intended for use as an soc_ops function pointer. Passes along the
2940 * return value from am33xx_prminst_deassert_hardreset(). XXX This
2941 * function is scheduled for removal when the PRM code is moved into
2944 static int _am33xx_deassert_hardreset(struct omap_hwmod
*oh
,
2945 struct omap_hwmod_rst_info
*ohri
)
2948 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
2949 oh
->name
, ohri
->name
);
2951 return am33xx_prm_deassert_hardreset(ohri
->rst_shift
,
2952 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2953 oh
->prcm
.omap4
.rstctrl_offs
,
2954 oh
->prcm
.omap4
.rstst_offs
);
2958 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
2959 * @oh: struct omap_hwmod * to test hardreset
2960 * @ohri: hardreset line data
2962 * Call am33xx_prminst_is_hardreset_asserted() with parameters
2963 * extracted from the hwmod @oh and the hardreset line data @ohri.
2964 * Only intended for use as an soc_ops function pointer. Passes along
2965 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
2966 * This function is scheduled for removal when the PRM code is moved
2969 static int _am33xx_is_hardreset_asserted(struct omap_hwmod
*oh
,
2970 struct omap_hwmod_rst_info
*ohri
)
2972 return am33xx_prm_is_hardreset_asserted(ohri
->rst_shift
,
2973 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2974 oh
->prcm
.omap4
.rstctrl_offs
);
2977 /* Public functions */
2979 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
2981 if (oh
->flags
& HWMOD_16BIT_REG
)
2982 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
2984 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
2987 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
2989 if (oh
->flags
& HWMOD_16BIT_REG
)
2990 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
2992 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
2996 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2997 * @oh: struct omap_hwmod *
2999 * This is a public function exposed to drivers. Some drivers may need to do
3000 * some settings before and after resetting the device. Those drivers after
3001 * doing the necessary settings could use this function to start a reset by
3002 * setting the SYSCONFIG.SOFTRESET bit.
3004 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
3009 if (!oh
|| !(oh
->_sysc_cache
))
3012 v
= oh
->_sysc_cache
;
3013 ret
= _set_softreset(oh
, &v
);
3016 _write_sysconfig(v
, oh
);
3023 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
3024 * @oh: struct omap_hwmod *
3025 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
3027 * Sets the IP block's OCP slave idlemode in hardware, and updates our
3028 * local copy. Intended to be used by drivers that have some erratum
3029 * that requires direct manipulation of the SIDLEMODE bits. Returns
3030 * -EINVAL if @oh is null, or passes along the return value from
3031 * _set_slave_idlemode().
3033 * XXX Does this function have any current users? If not, we should
3034 * remove it; it is better to let the rest of the hwmod code handle this.
3035 * Any users of this function should be scrutinized carefully.
3037 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
3045 v
= oh
->_sysc_cache
;
3047 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
3049 _write_sysconfig(v
, oh
);
3055 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3056 * @name: name of the omap_hwmod to look up
3058 * Given a @name of an omap_hwmod, return a pointer to the registered
3059 * struct omap_hwmod *, or NULL upon error.
3061 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
3063 struct omap_hwmod
*oh
;
3074 * omap_hwmod_for_each - call function for each registered omap_hwmod
3075 * @fn: pointer to a callback function
3076 * @data: void * data to pass to callback function
3078 * Call @fn for each registered omap_hwmod, passing @data to each
3079 * function. @fn must return 0 for success or any other value for
3080 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3081 * will stop and the non-zero return value will be passed to the
3082 * caller of omap_hwmod_for_each(). @fn is called with
3083 * omap_hwmod_for_each() held.
3085 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
3088 struct omap_hwmod
*temp_oh
;
3094 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3095 ret
= (*fn
)(temp_oh
, data
);
3104 * omap_hwmod_register_links - register an array of hwmod links
3105 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3107 * Intended to be called early in boot before the clock framework is
3108 * initialized. If @ois is not null, will register all omap_hwmods
3109 * listed in @ois that are valid for this chip. Returns -EINVAL if
3110 * omap_hwmod_init() hasn't been called before calling this function,
3111 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3114 int __init
omap_hwmod_register_links(struct omap_hwmod_ocp_if
**ois
)
3125 if (_alloc_linkspace(ois
)) {
3126 pr_err("omap_hwmod: could not allocate link space\n");
3133 r
= _register_link(ois
[i
]);
3134 WARN(r
&& r
!= -EEXIST
,
3135 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3136 ois
[i
]->master
->name
, ois
[i
]->slave
->name
, r
);
3143 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3144 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3146 * If the hwmod data corresponding to the MPU subsystem IP block
3147 * hasn't been initialized and set up yet, do so now. This must be
3148 * done first since sleep dependencies may be added from other hwmods
3149 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3152 static void __init
_ensure_mpu_hwmod_is_setup(struct omap_hwmod
*oh
)
3154 if (!mpu_oh
|| mpu_oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3155 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3156 __func__
, MPU_INITIATOR_NAME
);
3157 else if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
3158 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
3162 * omap_hwmod_setup_one - set up a single hwmod
3163 * @oh_name: const char * name of the already-registered hwmod to set up
3165 * Initialize and set up a single hwmod. Intended to be used for a
3166 * small number of early devices, such as the timer IP blocks used for
3167 * the scheduler clock. Must be called after omap2_clk_init().
3168 * Resolves the struct clk names to struct clk pointers for each
3169 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3170 * -EINVAL upon error or 0 upon success.
3172 int __init
omap_hwmod_setup_one(const char *oh_name
)
3174 struct omap_hwmod
*oh
;
3176 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
3178 oh
= _lookup(oh_name
);
3180 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
3184 _ensure_mpu_hwmod_is_setup(oh
);
3193 * omap_hwmod_setup_all - set up all registered IP blocks
3195 * Initialize and set up all IP blocks registered with the hwmod code.
3196 * Must be called after omap2_clk_init(). Resolves the struct clk
3197 * names to struct clk pointers for each registered omap_hwmod. Also
3198 * calls _setup() on each hwmod. Returns 0 upon success.
3200 static int __init
omap_hwmod_setup_all(void)
3202 _ensure_mpu_hwmod_is_setup(NULL
);
3204 omap_hwmod_for_each(_init
, NULL
);
3205 omap_hwmod_for_each(_setup
, NULL
);
3209 core_initcall(omap_hwmod_setup_all
);
3212 * omap_hwmod_enable - enable an omap_hwmod
3213 * @oh: struct omap_hwmod *
3215 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3216 * Returns -EINVAL on error or passes along the return value from _enable().
3218 int omap_hwmod_enable(struct omap_hwmod
*oh
)
3221 unsigned long flags
;
3226 spin_lock_irqsave(&oh
->_lock
, flags
);
3228 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3234 * omap_hwmod_idle - idle an omap_hwmod
3235 * @oh: struct omap_hwmod *
3237 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3238 * Returns -EINVAL on error or passes along the return value from _idle().
3240 int omap_hwmod_idle(struct omap_hwmod
*oh
)
3242 unsigned long flags
;
3247 spin_lock_irqsave(&oh
->_lock
, flags
);
3249 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3255 * omap_hwmod_shutdown - shutdown an omap_hwmod
3256 * @oh: struct omap_hwmod *
3258 * Shutdown an omap_hwmod @oh. Intended to be called by
3259 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3260 * the return value from _shutdown().
3262 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
3264 unsigned long flags
;
3269 spin_lock_irqsave(&oh
->_lock
, flags
);
3271 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3277 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3278 * @oh: struct omap_hwmod *oh
3280 * Intended to be called by the omap_device code.
3282 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
3284 unsigned long flags
;
3286 spin_lock_irqsave(&oh
->_lock
, flags
);
3288 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3294 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3295 * @oh: struct omap_hwmod *oh
3297 * Intended to be called by the omap_device code.
3299 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
3301 unsigned long flags
;
3303 spin_lock_irqsave(&oh
->_lock
, flags
);
3304 _disable_clocks(oh
);
3305 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3311 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3312 * @oh: struct omap_hwmod *oh
3314 * Intended to be called by drivers and core code when all posted
3315 * writes to a device must complete before continuing further
3316 * execution (for example, after clearing some device IRQSTATUS
3319 * XXX what about targets with multiple OCP threads?
3321 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
3325 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
3326 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3332 * Forces posted writes to complete on the OCP thread handling
3335 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
3339 * omap_hwmod_reset - reset the hwmod
3340 * @oh: struct omap_hwmod *
3342 * Under some conditions, a driver may wish to reset the entire device.
3343 * Called from omap_device code. Returns -EINVAL on error or passes along
3344 * the return value from _reset().
3346 int omap_hwmod_reset(struct omap_hwmod
*oh
)
3349 unsigned long flags
;
3354 spin_lock_irqsave(&oh
->_lock
, flags
);
3356 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3362 * IP block data retrieval functions
3366 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3367 * @oh: struct omap_hwmod *
3368 * @res: pointer to the first element of an array of struct resource to fill
3370 * Count the number of struct resource array elements necessary to
3371 * contain omap_hwmod @oh resources. Intended to be called by code
3372 * that registers omap_devices. Intended to be used to determine the
3373 * size of a dynamically-allocated struct resource array, before
3374 * calling omap_hwmod_fill_resources(). Returns the number of struct
3375 * resource array elements needed.
3377 * XXX This code is not optimized. It could attempt to merge adjacent
3381 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
3383 struct omap_hwmod_ocp_if
*os
;
3384 struct list_head
*p
;
3388 ret
= _count_mpu_irqs(oh
) + _count_sdma_reqs(oh
);
3390 p
= oh
->slave_ports
.next
;
3392 while (i
< oh
->slaves_cnt
) {
3393 os
= _fetch_next_ocp_if(&p
, &i
);
3394 ret
+= _count_ocp_if_addr_spaces(os
);
3401 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3402 * @oh: struct omap_hwmod *
3403 * @res: pointer to the first element of an array of struct resource to fill
3405 * Fill the struct resource array @res with resource data from the
3406 * omap_hwmod @oh. Intended to be called by code that registers
3407 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3408 * number of array elements filled.
3410 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3412 struct omap_hwmod_ocp_if
*os
;
3413 struct list_head
*p
;
3414 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
, addr_cnt
;
3417 /* For each IRQ, DMA, memory area, fill in array.*/
3419 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
3420 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
3421 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
3422 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
3423 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
3424 (res
+ r
)->flags
= IORESOURCE_IRQ
;
3428 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3429 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3430 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3431 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3432 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3433 (res
+ r
)->flags
= IORESOURCE_DMA
;
3437 p
= oh
->slave_ports
.next
;
3440 while (i
< oh
->slaves_cnt
) {
3441 os
= _fetch_next_ocp_if(&p
, &i
);
3442 addr_cnt
= _count_ocp_if_addr_spaces(os
);
3444 for (j
= 0; j
< addr_cnt
; j
++) {
3445 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
3446 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
3447 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
3448 (res
+ r
)->flags
= IORESOURCE_MEM
;
3457 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3458 * @oh: struct omap_hwmod *
3459 * @res: pointer to the array of struct resource to fill
3461 * Fill the struct resource array @res with dma resource data from the
3462 * omap_hwmod @oh. Intended to be called by code that registers
3463 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3464 * number of array elements filled.
3466 int omap_hwmod_fill_dma_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3468 int i
, sdma_reqs_cnt
;
3471 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3472 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3473 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3474 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3475 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3476 (res
+ r
)->flags
= IORESOURCE_DMA
;
3484 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3485 * @oh: struct omap_hwmod * to operate on
3486 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3487 * @name: pointer to the name of the data to fetch (optional)
3488 * @rsrc: pointer to a struct resource, allocated by the caller
3490 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3491 * data for the IP block pointed to by @oh. The data will be filled
3492 * into a struct resource record pointed to by @rsrc. The struct
3493 * resource must be allocated by the caller. When @name is non-null,
3494 * the data associated with the matching entry in the IRQ/SDMA/address
3495 * space hwmod data arrays will be returned. If @name is null, the
3496 * first array entry will be returned. Data order is not meaningful
3497 * in hwmod data, so callers are strongly encouraged to use a non-null
3498 * @name whenever possible to avoid unpredictable effects if hwmod
3499 * data is later added that causes data ordering to change. This
3500 * function is only intended for use by OMAP core code. Device
3501 * drivers should not call this function - the appropriate bus-related
3502 * data accessor functions should be used instead. Returns 0 upon
3503 * success or a negative error code upon error.
3505 int omap_hwmod_get_resource_byname(struct omap_hwmod
*oh
, unsigned int type
,
3506 const char *name
, struct resource
*rsrc
)
3509 unsigned int irq
, dma
;
3510 u32 pa_start
, pa_end
;
3515 if (type
== IORESOURCE_IRQ
) {
3516 r
= _get_mpu_irq_by_name(oh
, name
, &irq
);
3522 } else if (type
== IORESOURCE_DMA
) {
3523 r
= _get_sdma_req_by_name(oh
, name
, &dma
);
3529 } else if (type
== IORESOURCE_MEM
) {
3530 r
= _get_addr_space_by_name(oh
, name
, &pa_start
, &pa_end
);
3534 rsrc
->start
= pa_start
;
3547 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3548 * @oh: struct omap_hwmod *
3550 * Return the powerdomain pointer associated with the OMAP module
3551 * @oh's main clock. If @oh does not have a main clk, return the
3552 * powerdomain associated with the interface clock associated with the
3553 * module's MPU port. (XXX Perhaps this should use the SDMA port
3554 * instead?) Returns NULL on error, or a struct powerdomain * on
3557 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
3560 struct omap_hwmod_ocp_if
*oi
;
3568 oi
= _find_mpu_rt_port(oh
);
3577 return c
->clkdm
->pwrdm
.ptr
;
3582 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3583 * @oh: struct omap_hwmod *
3585 * Returns the virtual address corresponding to the beginning of the
3586 * module's register target, in the address range that is intended to
3587 * be used by the MPU. Returns the virtual address upon success or NULL
3590 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
3595 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
3598 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3601 return oh
->_mpu_rt_va
;
3605 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3606 * @oh: struct omap_hwmod *
3607 * @init_oh: struct omap_hwmod * (initiator)
3609 * Add a sleep dependency between the initiator @init_oh and @oh.
3610 * Intended to be called by DSP/Bridge code via platform_data for the
3611 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3612 * code needs to add/del initiator dependencies dynamically
3613 * before/after accessing a device. Returns the return value from
3614 * _add_initiator_dep().
3616 * XXX Keep a usecount in the clockdomain code
3618 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
3619 struct omap_hwmod
*init_oh
)
3621 return _add_initiator_dep(oh
, init_oh
);
3625 * XXX what about functions for drivers to save/restore ocp_sysconfig
3626 * for context save/restore operations?
3630 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3631 * @oh: struct omap_hwmod *
3632 * @init_oh: struct omap_hwmod * (initiator)
3634 * Remove a sleep dependency between the initiator @init_oh and @oh.
3635 * Intended to be called by DSP/Bridge code via platform_data for the
3636 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3637 * code needs to add/del initiator dependencies dynamically
3638 * before/after accessing a device. Returns the return value from
3639 * _del_initiator_dep().
3641 * XXX Keep a usecount in the clockdomain code
3643 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
3644 struct omap_hwmod
*init_oh
)
3646 return _del_initiator_dep(oh
, init_oh
);
3650 * omap_hwmod_enable_wakeup - allow device to wake up the system
3651 * @oh: struct omap_hwmod *
3653 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3654 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3655 * this IP block if it has dynamic mux entries. Eventually this
3656 * should set PRCM wakeup registers to cause the PRCM to receive
3657 * wakeup events from the module. Does not set any wakeup routing
3658 * registers beyond this point - if the module is to wake up any other
3659 * module or subsystem, that must be set separately. Called by
3660 * omap_device code. Returns -EINVAL on error or 0 upon success.
3662 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
3664 unsigned long flags
;
3667 spin_lock_irqsave(&oh
->_lock
, flags
);
3669 if (oh
->class->sysc
&&
3670 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3671 v
= oh
->_sysc_cache
;
3672 _enable_wakeup(oh
, &v
);
3673 _write_sysconfig(v
, oh
);
3676 _set_idle_ioring_wakeup(oh
, true);
3677 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3683 * omap_hwmod_disable_wakeup - prevent device from waking the system
3684 * @oh: struct omap_hwmod *
3686 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3687 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3688 * events for this IP block if it has dynamic mux entries. Eventually
3689 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3690 * wakeup events from the module. Does not set any wakeup routing
3691 * registers beyond this point - if the module is to wake up any other
3692 * module or subsystem, that must be set separately. Called by
3693 * omap_device code. Returns -EINVAL on error or 0 upon success.
3695 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
3697 unsigned long flags
;
3700 spin_lock_irqsave(&oh
->_lock
, flags
);
3702 if (oh
->class->sysc
&&
3703 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3704 v
= oh
->_sysc_cache
;
3705 _disable_wakeup(oh
, &v
);
3706 _write_sysconfig(v
, oh
);
3709 _set_idle_ioring_wakeup(oh
, false);
3710 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3716 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3717 * contained in the hwmod module.
3718 * @oh: struct omap_hwmod *
3719 * @name: name of the reset line to lookup and assert
3721 * Some IP like dsp, ipu or iva contain processor that require
3722 * an HW reset line to be assert / deassert in order to enable fully
3723 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3724 * yet supported on this OMAP; otherwise, passes along the return value
3725 * from _assert_hardreset().
3727 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3730 unsigned long flags
;
3735 spin_lock_irqsave(&oh
->_lock
, flags
);
3736 ret
= _assert_hardreset(oh
, name
);
3737 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3743 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3744 * contained in the hwmod module.
3745 * @oh: struct omap_hwmod *
3746 * @name: name of the reset line to look up and deassert
3748 * Some IP like dsp, ipu or iva contain processor that require
3749 * an HW reset line to be assert / deassert in order to enable fully
3750 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3751 * yet supported on this OMAP; otherwise, passes along the return value
3752 * from _deassert_hardreset().
3754 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3757 unsigned long flags
;
3762 spin_lock_irqsave(&oh
->_lock
, flags
);
3763 ret
= _deassert_hardreset(oh
, name
);
3764 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3770 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3771 * contained in the hwmod module
3772 * @oh: struct omap_hwmod *
3773 * @name: name of the reset line to look up and read
3775 * Return the current state of the hwmod @oh's reset line named @name:
3776 * returns -EINVAL upon parameter error or if this operation
3777 * is unsupported on the current OMAP; otherwise, passes along the return
3778 * value from _read_hardreset().
3780 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
3783 unsigned long flags
;
3788 spin_lock_irqsave(&oh
->_lock
, flags
);
3789 ret
= _read_hardreset(oh
, name
);
3790 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3797 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3798 * @classname: struct omap_hwmod_class name to search for
3799 * @fn: callback function pointer to call for each hwmod in class @classname
3800 * @user: arbitrary context data to pass to the callback function
3802 * For each omap_hwmod of class @classname, call @fn.
3803 * If the callback function returns something other than
3804 * zero, the iterator is terminated, and the callback function's return
3805 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3806 * if @classname or @fn are NULL, or passes back the error code from @fn.
3808 int omap_hwmod_for_each_by_class(const char *classname
,
3809 int (*fn
)(struct omap_hwmod
*oh
,
3813 struct omap_hwmod
*temp_oh
;
3816 if (!classname
|| !fn
)
3819 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3820 __func__
, classname
);
3822 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3823 if (!strcmp(temp_oh
->class->name
, classname
)) {
3824 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3825 __func__
, temp_oh
->name
);
3826 ret
= (*fn
)(temp_oh
, user
);
3833 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3840 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3841 * @oh: struct omap_hwmod *
3842 * @state: state that _setup() should leave the hwmod in
3844 * Sets the hwmod state that @oh will enter at the end of _setup()
3845 * (called by omap_hwmod_setup_*()). See also the documentation
3846 * for _setup_postsetup(), above. Returns 0 upon success or
3847 * -EINVAL if there is a problem with the arguments or if the hwmod is
3848 * in the wrong state.
3850 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
3853 unsigned long flags
;
3858 if (state
!= _HWMOD_STATE_DISABLED
&&
3859 state
!= _HWMOD_STATE_ENABLED
&&
3860 state
!= _HWMOD_STATE_IDLE
)
3863 spin_lock_irqsave(&oh
->_lock
, flags
);
3865 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
3870 oh
->_postsetup_state
= state
;
3874 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3880 * omap_hwmod_get_context_loss_count - get lost context count
3881 * @oh: struct omap_hwmod *
3883 * Query the powerdomain of of @oh to get the context loss
3884 * count for this device.
3886 * Returns the context loss count of the powerdomain assocated with @oh
3887 * upon success, or zero if no powerdomain exists for @oh.
3889 int omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
3891 struct powerdomain
*pwrdm
;
3894 pwrdm
= omap_hwmod_get_pwrdm(oh
);
3896 ret
= pwrdm_get_context_loss_count(pwrdm
);
3902 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
3903 * @oh: struct omap_hwmod *
3905 * Prevent the hwmod @oh from being reset during the setup process.
3906 * Intended for use by board-*.c files on boards with devices that
3907 * cannot tolerate being reset. Must be called before the hwmod has
3908 * been set up. Returns 0 upon success or negative error code upon
3911 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
3916 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
3917 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
3922 oh
->flags
|= HWMOD_INIT_NO_RESET
;
3928 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
3929 * @oh: struct omap_hwmod * containing hwmod mux entries
3930 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
3931 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
3933 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
3934 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
3935 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
3936 * this function is not called for a given pad_idx, then the ISR
3937 * associated with @oh's first MPU IRQ will be triggered when an I/O
3938 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
3939 * the _dynamic or wakeup_ entry: if there are other entries not
3940 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
3941 * entries are NOT COUNTED in the dynamic pad index. This function
3942 * must be called separately for each pad that requires its interrupt
3943 * to be re-routed this way. Returns -EINVAL if there is an argument
3944 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
3945 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
3947 * XXX This function interface is fragile. Rather than using array
3948 * indexes, which are subject to unpredictable change, it should be
3949 * using hwmod IRQ names, and some other stable key for the hwmod mux
3952 int omap_hwmod_pad_route_irq(struct omap_hwmod
*oh
, int pad_idx
, int irq_idx
)
3958 if (!oh
|| !oh
->mux
|| !oh
->mpu_irqs
|| pad_idx
< 0 ||
3959 pad_idx
>= oh
->mux
->nr_pads_dynamic
)
3962 /* Check the number of available mpu_irqs */
3963 for (nr_irqs
= 0; oh
->mpu_irqs
[nr_irqs
].irq
>= 0; nr_irqs
++)
3966 if (irq_idx
>= nr_irqs
)
3969 if (!oh
->mux
->irqs
) {
3970 /* XXX What frees this? */
3971 oh
->mux
->irqs
= kzalloc(sizeof(int) * oh
->mux
->nr_pads_dynamic
,
3976 oh
->mux
->irqs
[pad_idx
] = irq_idx
;
3982 * omap_hwmod_init - initialize the hwmod code
3984 * Sets up some function pointers needed by the hwmod code to operate on the
3985 * currently-booted SoC. Intended to be called once during kernel init
3986 * before any hwmods are registered. No return value.
3988 void __init
omap_hwmod_init(void)
3990 if (cpu_is_omap24xx()) {
3991 soc_ops
.wait_target_ready
= _omap2xxx_wait_target_ready
;
3992 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
3993 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
3994 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
3995 } else if (cpu_is_omap34xx()) {
3996 soc_ops
.wait_target_ready
= _omap3xxx_wait_target_ready
;
3997 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
3998 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
3999 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
4000 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
4001 soc_ops
.enable_module
= _omap4_enable_module
;
4002 soc_ops
.disable_module
= _omap4_disable_module
;
4003 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
4004 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
4005 soc_ops
.deassert_hardreset
= _omap4_deassert_hardreset
;
4006 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
4007 soc_ops
.init_clkdm
= _init_clkdm
;
4008 } else if (soc_is_am33xx()) {
4009 soc_ops
.enable_module
= _am33xx_enable_module
;
4010 soc_ops
.disable_module
= _am33xx_disable_module
;
4011 soc_ops
.wait_target_ready
= _am33xx_wait_target_ready
;
4012 soc_ops
.assert_hardreset
= _am33xx_assert_hardreset
;
4013 soc_ops
.deassert_hardreset
= _am33xx_deassert_hardreset
;
4014 soc_ops
.is_hardreset_asserted
= _am33xx_is_hardreset_asserted
;
4015 soc_ops
.init_clkdm
= _init_clkdm
;
4017 WARN(1, "omap_hwmod: unknown SoC type\n");
4024 * omap_hwmod_get_main_clk - get pointer to main clock name
4025 * @oh: struct omap_hwmod *
4027 * Returns the main clock name assocated with @oh upon success,
4028 * or NULL if @oh is NULL.
4030 const char *omap_hwmod_get_main_clk(struct omap_hwmod
*oh
)
4035 return oh
->main_clk
;