2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk-provider.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
142 #include <asm/system_misc.h>
145 #include "omap_hwmod.h"
149 #include "clockdomain.h"
150 #include "powerdomain.h"
153 #include "cminst44xx.h"
159 #include "prminst44xx.h"
163 /* Name of the OMAP hwmod for the MPU */
164 #define MPU_INITIATOR_NAME "mpu"
167 * Number of struct omap_hwmod_link records per struct
168 * omap_hwmod_ocp_if record (master->slave and slave->master)
170 #define LINKS_PER_OCP_IF 2
173 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
174 * @enable_module: function to enable a module (via MODULEMODE)
175 * @disable_module: function to disable a module (via MODULEMODE)
177 * XXX Eventually this functionality will be hidden inside the PRM/CM
178 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
179 * conditionals in this code.
181 struct omap_hwmod_soc_ops
{
182 void (*enable_module
)(struct omap_hwmod
*oh
);
183 int (*disable_module
)(struct omap_hwmod
*oh
);
184 int (*wait_target_ready
)(struct omap_hwmod
*oh
);
185 int (*assert_hardreset
)(struct omap_hwmod
*oh
,
186 struct omap_hwmod_rst_info
*ohri
);
187 int (*deassert_hardreset
)(struct omap_hwmod
*oh
,
188 struct omap_hwmod_rst_info
*ohri
);
189 int (*is_hardreset_asserted
)(struct omap_hwmod
*oh
,
190 struct omap_hwmod_rst_info
*ohri
);
191 int (*init_clkdm
)(struct omap_hwmod
*oh
);
192 void (*update_context_lost
)(struct omap_hwmod
*oh
);
193 int (*get_context_lost
)(struct omap_hwmod
*oh
);
196 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
197 static struct omap_hwmod_soc_ops soc_ops
;
199 /* omap_hwmod_list contains all registered struct omap_hwmods */
200 static LIST_HEAD(omap_hwmod_list
);
202 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
203 static struct omap_hwmod
*mpu_oh
;
205 /* io_chain_lock: used to serialize reconfigurations of the I/O chain */
206 static DEFINE_SPINLOCK(io_chain_lock
);
209 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
210 * allocated from - used to reduce the number of small memory
211 * allocations, which has a significant impact on performance
213 static struct omap_hwmod_link
*linkspace
;
216 * free_ls, max_ls: array indexes into linkspace; representing the
217 * next free struct omap_hwmod_link index, and the maximum number of
218 * struct omap_hwmod_link records allocated (respectively)
220 static unsigned short free_ls
, max_ls
, ls_supp
;
222 /* inited: set to true once the hwmod code is initialized */
225 /* Private functions */
228 * _fetch_next_ocp_if - return the next OCP interface in a list
229 * @p: ptr to a ptr to the list_head inside the ocp_if to return
230 * @i: pointer to the index of the element pointed to by @p in the list
232 * Return a pointer to the struct omap_hwmod_ocp_if record
233 * containing the struct list_head pointed to by @p, and increment
234 * @p such that a future call to this routine will return the next
237 static struct omap_hwmod_ocp_if
*_fetch_next_ocp_if(struct list_head
**p
,
240 struct omap_hwmod_ocp_if
*oi
;
242 oi
= list_entry(*p
, struct omap_hwmod_link
, node
)->ocp_if
;
251 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
252 * @oh: struct omap_hwmod *
254 * Load the current value of the hwmod OCP_SYSCONFIG register into the
255 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
256 * OCP_SYSCONFIG register or 0 upon success.
258 static int _update_sysc_cache(struct omap_hwmod
*oh
)
260 if (!oh
->class->sysc
) {
261 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
265 /* XXX ensure module interface clock is up */
267 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
269 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
270 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
276 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
277 * @v: OCP_SYSCONFIG value to write
278 * @oh: struct omap_hwmod *
280 * Write @v into the module class' OCP_SYSCONFIG register, if it has
281 * one. No return value.
283 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
285 if (!oh
->class->sysc
) {
286 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
290 /* XXX ensure module interface clock is up */
292 /* Module might have lost context, always update cache and register */
294 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
298 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
299 * @oh: struct omap_hwmod *
300 * @standbymode: MIDLEMODE field bits
301 * @v: pointer to register contents to modify
303 * Update the master standby mode bits in @v to be @standbymode for
304 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
305 * upon error or 0 upon success.
307 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
313 if (!oh
->class->sysc
||
314 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
317 if (!oh
->class->sysc
->sysc_fields
) {
318 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
322 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
323 mstandby_mask
= (0x3 << mstandby_shift
);
325 *v
&= ~mstandby_mask
;
326 *v
|= __ffs(standbymode
) << mstandby_shift
;
332 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
333 * @oh: struct omap_hwmod *
334 * @idlemode: SIDLEMODE field bits
335 * @v: pointer to register contents to modify
337 * Update the slave idle mode bits in @v to be @idlemode for the @oh
338 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
341 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
346 if (!oh
->class->sysc
||
347 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
350 if (!oh
->class->sysc
->sysc_fields
) {
351 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
355 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
356 sidle_mask
= (0x3 << sidle_shift
);
359 *v
|= __ffs(idlemode
) << sidle_shift
;
365 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
366 * @oh: struct omap_hwmod *
367 * @clockact: CLOCKACTIVITY field bits
368 * @v: pointer to register contents to modify
370 * Update the clockactivity mode bits in @v to be @clockact for the
371 * @oh hwmod. Used for additional powersaving on some modules. Does
372 * not write to the hardware. Returns -EINVAL upon error or 0 upon
375 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
380 if (!oh
->class->sysc
||
381 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
384 if (!oh
->class->sysc
->sysc_fields
) {
385 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
389 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
390 clkact_mask
= (0x3 << clkact_shift
);
393 *v
|= clockact
<< clkact_shift
;
399 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
400 * @oh: struct omap_hwmod *
401 * @v: pointer to register contents to modify
403 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
404 * error or 0 upon success.
406 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
410 if (!oh
->class->sysc
||
411 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
414 if (!oh
->class->sysc
->sysc_fields
) {
415 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
419 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
427 * _wait_softreset_complete - wait for an OCP softreset to complete
428 * @oh: struct omap_hwmod * to wait on
430 * Wait until the IP block represented by @oh reports that its OCP
431 * softreset is complete. This can be triggered by software (see
432 * _ocp_softreset()) or by hardware upon returning from off-mode (one
433 * example is HSMMC). Waits for up to MAX_MODULE_SOFTRESET_WAIT
434 * microseconds. Returns the number of microseconds waited.
436 static int _wait_softreset_complete(struct omap_hwmod
*oh
)
438 struct omap_hwmod_class_sysconfig
*sysc
;
442 sysc
= oh
->class->sysc
;
444 if (sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
445 omap_test_timeout((omap_hwmod_read(oh
, sysc
->syss_offs
)
446 & SYSS_RESETDONE_MASK
),
447 MAX_MODULE_SOFTRESET_WAIT
, c
);
448 else if (sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
) {
449 softrst_mask
= (0x1 << sysc
->sysc_fields
->srst_shift
);
450 omap_test_timeout(!(omap_hwmod_read(oh
, sysc
->sysc_offs
)
452 MAX_MODULE_SOFTRESET_WAIT
, c
);
459 * _set_dmadisable: set OCP_SYSCONFIG.DMADISABLE bit in @v
460 * @oh: struct omap_hwmod *
462 * The DMADISABLE bit is a semi-automatic bit present in sysconfig register
463 * of some modules. When the DMA must perform read/write accesses, the
464 * DMADISABLE bit is cleared by the hardware. But when the DMA must stop
465 * for power management, software must set the DMADISABLE bit back to 1.
467 * Set the DMADISABLE bit in @v for hwmod @oh. Returns -EINVAL upon
468 * error or 0 upon success.
470 static int _set_dmadisable(struct omap_hwmod
*oh
)
475 if (!oh
->class->sysc
||
476 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_DMADISABLE
))
479 if (!oh
->class->sysc
->sysc_fields
) {
480 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
484 /* clocks must be on for this operation */
485 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
486 pr_warn("omap_hwmod: %s: dma can be disabled only from enabled state\n", oh
->name
);
490 pr_debug("omap_hwmod: %s: setting DMADISABLE\n", oh
->name
);
494 (0x1 << oh
->class->sysc
->sysc_fields
->dmadisable_shift
);
495 v
|= dmadisable_mask
;
496 _write_sysconfig(v
, oh
);
502 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
503 * @oh: struct omap_hwmod *
504 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
505 * @v: pointer to register contents to modify
507 * Update the module autoidle bit in @v to be @autoidle for the @oh
508 * hwmod. The autoidle bit controls whether the module can gate
509 * internal clocks automatically when it isn't doing anything; the
510 * exact function of this bit varies on a per-module basis. This
511 * function does not write to the hardware. Returns -EINVAL upon
512 * error or 0 upon success.
514 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
520 if (!oh
->class->sysc
||
521 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
524 if (!oh
->class->sysc
->sysc_fields
) {
525 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
529 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
530 autoidle_mask
= (0x1 << autoidle_shift
);
532 *v
&= ~autoidle_mask
;
533 *v
|= autoidle
<< autoidle_shift
;
539 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
540 * @oh: struct omap_hwmod *
541 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
543 * Set or clear the I/O pad wakeup flag in the mux entries for the
544 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
545 * in memory. If the hwmod is currently idled, and the new idle
546 * values don't match the previous ones, this function will also
547 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
548 * currently idled, this function won't touch the hardware: the new
549 * mux settings are written to the SCM PADCTRL registers when the
550 * hwmod is idled. No return value.
552 static void _set_idle_ioring_wakeup(struct omap_hwmod
*oh
, bool set_wake
)
554 struct omap_device_pad
*pad
;
559 if (!oh
->mux
|| !oh
->mux
->enabled
)
562 for (j
= 0; j
< oh
->mux
->nr_pads_dynamic
; j
++) {
563 pad
= oh
->mux
->pads_dynamic
[j
];
565 if (!(pad
->flags
& OMAP_DEVICE_PAD_WAKEUP
))
568 prev_idle
= pad
->idle
;
571 pad
->idle
|= OMAP_WAKEUP_EN
;
573 pad
->idle
&= ~OMAP_WAKEUP_EN
;
575 if (prev_idle
!= pad
->idle
)
579 if (change
&& oh
->_state
== _HWMOD_STATE_IDLE
)
580 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
584 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
585 * @oh: struct omap_hwmod *
587 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
588 * upon error or 0 upon success.
590 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
592 if (!oh
->class->sysc
||
593 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
594 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
595 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
598 if (!oh
->class->sysc
->sysc_fields
) {
599 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
603 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
604 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
606 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
607 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
608 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
609 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
611 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
613 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
619 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
620 * @oh: struct omap_hwmod *
622 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
623 * upon error or 0 upon success.
625 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
627 if (!oh
->class->sysc
||
628 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
629 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
630 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
633 if (!oh
->class->sysc
->sysc_fields
) {
634 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
638 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
639 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
641 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
642 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
643 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
644 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART
, v
);
646 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
648 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
653 static struct clockdomain
*_get_clkdm(struct omap_hwmod
*oh
)
655 struct clk_hw_omap
*clk
;
659 } else if (oh
->_clk
) {
660 clk
= to_clk_hw_omap(__clk_get_hw(oh
->_clk
));
667 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
668 * @oh: struct omap_hwmod *
670 * Prevent the hardware module @oh from entering idle while the
671 * hardare module initiator @init_oh is active. Useful when a module
672 * will be accessed by a particular initiator (e.g., if a module will
673 * be accessed by the IVA, there should be a sleepdep between the IVA
674 * initiator and the module). Only applies to modules in smart-idle
675 * mode. If the clockdomain is marked as not needing autodeps, return
676 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
677 * passes along clkdm_add_sleepdep() value upon success.
679 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
681 struct clockdomain
*clkdm
, *init_clkdm
;
683 clkdm
= _get_clkdm(oh
);
684 init_clkdm
= _get_clkdm(init_oh
);
686 if (!clkdm
|| !init_clkdm
)
689 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
692 return clkdm_add_sleepdep(clkdm
, init_clkdm
);
696 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
697 * @oh: struct omap_hwmod *
699 * Allow the hardware module @oh to enter idle while the hardare
700 * module initiator @init_oh is active. Useful when a module will not
701 * be accessed by a particular initiator (e.g., if a module will not
702 * be accessed by the IVA, there should be no sleepdep between the IVA
703 * initiator and the module). Only applies to modules in smart-idle
704 * mode. If the clockdomain is marked as not needing autodeps, return
705 * 0 without doing anything. Returns -EINVAL upon error or passes
706 * along clkdm_del_sleepdep() value upon success.
708 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
710 struct clockdomain
*clkdm
, *init_clkdm
;
712 clkdm
= _get_clkdm(oh
);
713 init_clkdm
= _get_clkdm(init_oh
);
715 if (!clkdm
|| !init_clkdm
)
718 if (clkdm
&& clkdm
->flags
& CLKDM_NO_AUTODEPS
)
721 return clkdm_del_sleepdep(clkdm
, init_clkdm
);
725 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
726 * @oh: struct omap_hwmod *
728 * Called from _init_clocks(). Populates the @oh _clk (main
729 * functional clock pointer) if a main_clk is present. Returns 0 on
730 * success or -EINVAL on error.
732 static int _init_main_clk(struct omap_hwmod
*oh
)
739 oh
->_clk
= clk_get(NULL
, oh
->main_clk
);
740 if (IS_ERR(oh
->_clk
)) {
741 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
742 oh
->name
, oh
->main_clk
);
746 * HACK: This needs a re-visit once clk_prepare() is implemented
747 * to do something meaningful. Today its just a no-op.
748 * If clk_prepare() is used at some point to do things like
749 * voltage scaling etc, then this would have to be moved to
750 * some point where subsystems like i2c and pmic become
753 clk_prepare(oh
->_clk
);
756 pr_debug("omap_hwmod: %s: missing clockdomain for %s.\n",
757 oh
->name
, oh
->main_clk
);
763 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
764 * @oh: struct omap_hwmod *
766 * Called from _init_clocks(). Populates the @oh OCP slave interface
767 * clock pointers. Returns 0 on success or -EINVAL on error.
769 static int _init_interface_clks(struct omap_hwmod
*oh
)
771 struct omap_hwmod_ocp_if
*os
;
777 p
= oh
->slave_ports
.next
;
779 while (i
< oh
->slaves_cnt
) {
780 os
= _fetch_next_ocp_if(&p
, &i
);
784 c
= clk_get(NULL
, os
->clk
);
786 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
792 * HACK: This needs a re-visit once clk_prepare() is implemented
793 * to do something meaningful. Today its just a no-op.
794 * If clk_prepare() is used at some point to do things like
795 * voltage scaling etc, then this would have to be moved to
796 * some point where subsystems like i2c and pmic become
799 clk_prepare(os
->_clk
);
806 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
807 * @oh: struct omap_hwmod *
809 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
810 * clock pointers. Returns 0 on success or -EINVAL on error.
812 static int _init_opt_clks(struct omap_hwmod
*oh
)
814 struct omap_hwmod_opt_clk
*oc
;
819 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
820 c
= clk_get(NULL
, oc
->clk
);
822 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
828 * HACK: This needs a re-visit once clk_prepare() is implemented
829 * to do something meaningful. Today its just a no-op.
830 * If clk_prepare() is used at some point to do things like
831 * voltage scaling etc, then this would have to be moved to
832 * some point where subsystems like i2c and pmic become
835 clk_prepare(oc
->_clk
);
842 * _enable_clocks - enable hwmod main clock and interface clocks
843 * @oh: struct omap_hwmod *
845 * Enables all clocks necessary for register reads and writes to succeed
846 * on the hwmod @oh. Returns 0.
848 static int _enable_clocks(struct omap_hwmod
*oh
)
850 struct omap_hwmod_ocp_if
*os
;
854 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
857 clk_enable(oh
->_clk
);
859 p
= oh
->slave_ports
.next
;
861 while (i
< oh
->slaves_cnt
) {
862 os
= _fetch_next_ocp_if(&p
, &i
);
864 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
865 clk_enable(os
->_clk
);
868 /* The opt clocks are controlled by the device driver. */
874 * _disable_clocks - disable hwmod main clock and interface clocks
875 * @oh: struct omap_hwmod *
877 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
879 static int _disable_clocks(struct omap_hwmod
*oh
)
881 struct omap_hwmod_ocp_if
*os
;
885 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
888 clk_disable(oh
->_clk
);
890 p
= oh
->slave_ports
.next
;
892 while (i
< oh
->slaves_cnt
) {
893 os
= _fetch_next_ocp_if(&p
, &i
);
895 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
896 clk_disable(os
->_clk
);
899 /* The opt clocks are controlled by the device driver. */
904 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
906 struct omap_hwmod_opt_clk
*oc
;
909 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
911 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
913 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
914 __clk_get_name(oc
->_clk
));
915 clk_enable(oc
->_clk
);
919 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
921 struct omap_hwmod_opt_clk
*oc
;
924 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
926 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
928 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
929 __clk_get_name(oc
->_clk
));
930 clk_disable(oc
->_clk
);
935 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
936 * @oh: struct omap_hwmod *
938 * Enables the PRCM module mode related to the hwmod @oh.
941 static void _omap4_enable_module(struct omap_hwmod
*oh
)
943 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
946 pr_debug("omap_hwmod: %s: %s: %d\n",
947 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
949 omap4_cminst_module_enable(oh
->prcm
.omap4
.modulemode
,
950 oh
->clkdm
->prcm_partition
,
952 oh
->clkdm
->clkdm_offs
,
953 oh
->prcm
.omap4
.clkctrl_offs
);
957 * _am33xx_enable_module - enable CLKCTRL modulemode on AM33XX
958 * @oh: struct omap_hwmod *
960 * Enables the PRCM module mode related to the hwmod @oh.
963 static void _am33xx_enable_module(struct omap_hwmod
*oh
)
965 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
968 pr_debug("omap_hwmod: %s: %s: %d\n",
969 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
971 am33xx_cm_module_enable(oh
->prcm
.omap4
.modulemode
, oh
->clkdm
->cm_inst
,
972 oh
->clkdm
->clkdm_offs
,
973 oh
->prcm
.omap4
.clkctrl_offs
);
977 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
978 * @oh: struct omap_hwmod *
980 * Wait for a module @oh to enter slave idle. Returns 0 if the module
981 * does not have an IDLEST bit or if the module successfully enters
982 * slave idle; otherwise, pass along the return value of the
983 * appropriate *_cm*_wait_module_idle() function.
985 static int _omap4_wait_target_disable(struct omap_hwmod
*oh
)
990 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| !oh
->clkdm
)
993 if (oh
->flags
& HWMOD_NO_IDLEST
)
996 return omap4_cminst_wait_module_idle(oh
->clkdm
->prcm_partition
,
998 oh
->clkdm
->clkdm_offs
,
999 oh
->prcm
.omap4
.clkctrl_offs
);
1003 * _am33xx_wait_target_disable - wait for a module to be disabled on AM33XX
1004 * @oh: struct omap_hwmod *
1006 * Wait for a module @oh to enter slave idle. Returns 0 if the module
1007 * does not have an IDLEST bit or if the module successfully enters
1008 * slave idle; otherwise, pass along the return value of the
1009 * appropriate *_cm*_wait_module_idle() function.
1011 static int _am33xx_wait_target_disable(struct omap_hwmod
*oh
)
1016 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
1019 if (oh
->flags
& HWMOD_NO_IDLEST
)
1022 return am33xx_cm_wait_module_idle(oh
->clkdm
->cm_inst
,
1023 oh
->clkdm
->clkdm_offs
,
1024 oh
->prcm
.omap4
.clkctrl_offs
);
1028 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
1029 * @oh: struct omap_hwmod *oh
1031 * Count and return the number of MPU IRQs associated with the hwmod
1032 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
1035 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
1037 struct omap_hwmod_irq_info
*ohii
;
1040 if (!oh
|| !oh
->mpu_irqs
)
1044 ohii
= &oh
->mpu_irqs
[i
++];
1045 } while (ohii
->irq
!= -1);
1051 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
1052 * @oh: struct omap_hwmod *oh
1054 * Count and return the number of SDMA request lines associated with
1055 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1058 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
1060 struct omap_hwmod_dma_info
*ohdi
;
1063 if (!oh
|| !oh
->sdma_reqs
)
1067 ohdi
= &oh
->sdma_reqs
[i
++];
1068 } while (ohdi
->dma_req
!= -1);
1074 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
1075 * @oh: struct omap_hwmod *oh
1077 * Count and return the number of address space ranges associated with
1078 * the hwmod @oh. Used to allocate struct resource data. Returns 0
1081 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
1083 struct omap_hwmod_addr_space
*mem
;
1086 if (!os
|| !os
->addr
)
1090 mem
= &os
->addr
[i
++];
1091 } while (mem
->pa_start
!= mem
->pa_end
);
1097 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
1098 * @oh: struct omap_hwmod * to operate on
1099 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
1100 * @irq: pointer to an unsigned int to store the MPU IRQ number to
1102 * Retrieve a MPU hardware IRQ line number named by @name associated
1103 * with the IP block pointed to by @oh. The IRQ number will be filled
1104 * into the address pointed to by @dma. When @name is non-null, the
1105 * IRQ line number associated with the named entry will be returned.
1106 * If @name is null, the first matching entry will be returned. Data
1107 * order is not meaningful in hwmod data, so callers are strongly
1108 * encouraged to use a non-null @name whenever possible to avoid
1109 * unpredictable effects if hwmod data is later added that causes data
1110 * ordering to change. Returns 0 upon success or a negative error
1113 static int _get_mpu_irq_by_name(struct omap_hwmod
*oh
, const char *name
,
1123 while (oh
->mpu_irqs
[i
].irq
!= -1) {
1124 if (name
== oh
->mpu_irqs
[i
].name
||
1125 !strcmp(name
, oh
->mpu_irqs
[i
].name
)) {
1135 *irq
= oh
->mpu_irqs
[i
].irq
;
1141 * _get_sdma_req_by_name - fetch SDMA request line ID by name
1142 * @oh: struct omap_hwmod * to operate on
1143 * @name: pointer to the name of the SDMA request line to fetch (optional)
1144 * @dma: pointer to an unsigned int to store the request line ID to
1146 * Retrieve an SDMA request line ID named by @name on the IP block
1147 * pointed to by @oh. The ID will be filled into the address pointed
1148 * to by @dma. When @name is non-null, the request line ID associated
1149 * with the named entry will be returned. If @name is null, the first
1150 * matching entry will be returned. Data order is not meaningful in
1151 * hwmod data, so callers are strongly encouraged to use a non-null
1152 * @name whenever possible to avoid unpredictable effects if hwmod
1153 * data is later added that causes data ordering to change. Returns 0
1154 * upon success or a negative error code upon error.
1156 static int _get_sdma_req_by_name(struct omap_hwmod
*oh
, const char *name
,
1166 while (oh
->sdma_reqs
[i
].dma_req
!= -1) {
1167 if (name
== oh
->sdma_reqs
[i
].name
||
1168 !strcmp(name
, oh
->sdma_reqs
[i
].name
)) {
1178 *dma
= oh
->sdma_reqs
[i
].dma_req
;
1184 * _get_addr_space_by_name - fetch address space start & end by name
1185 * @oh: struct omap_hwmod * to operate on
1186 * @name: pointer to the name of the address space to fetch (optional)
1187 * @pa_start: pointer to a u32 to store the starting address to
1188 * @pa_end: pointer to a u32 to store the ending address to
1190 * Retrieve address space start and end addresses for the IP block
1191 * pointed to by @oh. The data will be filled into the addresses
1192 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1193 * address space data associated with the named entry will be
1194 * returned. If @name is null, the first matching entry will be
1195 * returned. Data order is not meaningful in hwmod data, so callers
1196 * are strongly encouraged to use a non-null @name whenever possible
1197 * to avoid unpredictable effects if hwmod data is later added that
1198 * causes data ordering to change. Returns 0 upon success or a
1199 * negative error code upon error.
1201 static int _get_addr_space_by_name(struct omap_hwmod
*oh
, const char *name
,
1202 u32
*pa_start
, u32
*pa_end
)
1205 struct omap_hwmod_ocp_if
*os
;
1206 struct list_head
*p
= NULL
;
1209 p
= oh
->slave_ports
.next
;
1212 while (i
< oh
->slaves_cnt
) {
1213 os
= _fetch_next_ocp_if(&p
, &i
);
1219 while (os
->addr
[j
].pa_start
!= os
->addr
[j
].pa_end
) {
1220 if (name
== os
->addr
[j
].name
||
1221 !strcmp(name
, os
->addr
[j
].name
)) {
1235 *pa_start
= os
->addr
[j
].pa_start
;
1236 *pa_end
= os
->addr
[j
].pa_end
;
1242 * _save_mpu_port_index - find and save the index to @oh's MPU port
1243 * @oh: struct omap_hwmod *
1245 * Determines the array index of the OCP slave port that the MPU uses
1246 * to address the device, and saves it into the struct omap_hwmod.
1247 * Intended to be called during hwmod registration only. No return
1250 static void __init
_save_mpu_port_index(struct omap_hwmod
*oh
)
1252 struct omap_hwmod_ocp_if
*os
= NULL
;
1253 struct list_head
*p
;
1259 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1261 p
= oh
->slave_ports
.next
;
1263 while (i
< oh
->slaves_cnt
) {
1264 os
= _fetch_next_ocp_if(&p
, &i
);
1265 if (os
->user
& OCP_USER_MPU
) {
1267 oh
->_int_flags
&= ~_HWMOD_NO_MPU_PORT
;
1276 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1277 * @oh: struct omap_hwmod *
1279 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1280 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1281 * communicate with the IP block. This interface need not be directly
1282 * connected to the MPU (and almost certainly is not), but is directly
1283 * connected to the IP block represented by @oh. Returns a pointer
1284 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1285 * error or if there does not appear to be a path from the MPU to this
1288 static struct omap_hwmod_ocp_if
*_find_mpu_rt_port(struct omap_hwmod
*oh
)
1290 if (!oh
|| oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| oh
->slaves_cnt
== 0)
1293 return oh
->_mpu_port
;
1297 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1298 * @oh: struct omap_hwmod *
1300 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1301 * the register target MPU address space; or returns NULL upon error.
1303 static struct omap_hwmod_addr_space
* __init
_find_mpu_rt_addr_space(struct omap_hwmod
*oh
)
1305 struct omap_hwmod_ocp_if
*os
;
1306 struct omap_hwmod_addr_space
*mem
;
1307 int found
= 0, i
= 0;
1309 os
= _find_mpu_rt_port(oh
);
1310 if (!os
|| !os
->addr
)
1314 mem
= &os
->addr
[i
++];
1315 if (mem
->flags
& ADDR_TYPE_RT
)
1317 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
1319 return (found
) ? mem
: NULL
;
1323 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1324 * @oh: struct omap_hwmod *
1326 * Ensure that the OCP_SYSCONFIG register for the IP block represented
1327 * by @oh is set to indicate to the PRCM that the IP block is active.
1328 * Usually this means placing the module into smart-idle mode and
1329 * smart-standby, but if there is a bug in the automatic idle handling
1330 * for the IP block, it may need to be placed into the force-idle or
1331 * no-idle variants of these modes. No return value.
1333 static void _enable_sysc(struct omap_hwmod
*oh
)
1338 struct clockdomain
*clkdm
;
1340 if (!oh
->class->sysc
)
1344 * Wait until reset has completed, this is needed as the IP
1345 * block is reset automatically by hardware in some cases
1346 * (off-mode for example), and the drivers require the
1347 * IP to be ready when they access it
1349 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1350 _enable_optional_clocks(oh
);
1351 _wait_softreset_complete(oh
);
1352 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1353 _disable_optional_clocks(oh
);
1355 v
= oh
->_sysc_cache
;
1356 sf
= oh
->class->sysc
->sysc_flags
;
1358 clkdm
= _get_clkdm(oh
);
1359 if (sf
& SYSC_HAS_SIDLEMODE
) {
1360 clkdm_act
= (clkdm
&& clkdm
->flags
& CLKDM_ACTIVE_WITH_MPU
);
1361 if (clkdm_act
&& !(oh
->class->sysc
->idlemodes
&
1362 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1363 idlemode
= HWMOD_IDLEMODE_FORCE
;
1365 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
1366 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
1367 _set_slave_idlemode(oh
, idlemode
, &v
);
1370 if (sf
& SYSC_HAS_MIDLEMODE
) {
1371 if (oh
->flags
& HWMOD_FORCE_MSTANDBY
) {
1372 idlemode
= HWMOD_IDLEMODE_FORCE
;
1373 } else if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1374 idlemode
= HWMOD_IDLEMODE_NO
;
1376 if (sf
& SYSC_HAS_ENAWAKEUP
)
1377 _enable_wakeup(oh
, &v
);
1378 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1379 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1381 idlemode
= HWMOD_IDLEMODE_SMART
;
1383 _set_master_standbymode(oh
, idlemode
, &v
);
1387 * XXX The clock framework should handle this, by
1388 * calling into this code. But this must wait until the
1389 * clock structures are tagged with omap_hwmod entries
1391 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
1392 (sf
& SYSC_HAS_CLOCKACTIVITY
))
1393 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
1395 /* If slave is in SMARTIDLE, also enable wakeup */
1396 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1397 _enable_wakeup(oh
, &v
);
1399 _write_sysconfig(v
, oh
);
1402 * Set the autoidle bit only after setting the smartidle bit
1403 * Setting this will not have any impact on the other modules.
1405 if (sf
& SYSC_HAS_AUTOIDLE
) {
1406 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
1408 _set_module_autoidle(oh
, idlemode
, &v
);
1409 _write_sysconfig(v
, oh
);
1414 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1415 * @oh: struct omap_hwmod *
1417 * If module is marked as SWSUP_SIDLE, force the module into slave
1418 * idle; otherwise, configure it for smart-idle. If module is marked
1419 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1420 * configure it for smart-standby. No return value.
1422 static void _idle_sysc(struct omap_hwmod
*oh
)
1427 if (!oh
->class->sysc
)
1430 v
= oh
->_sysc_cache
;
1431 sf
= oh
->class->sysc
->sysc_flags
;
1433 if (sf
& SYSC_HAS_SIDLEMODE
) {
1434 /* XXX What about HWMOD_IDLEMODE_SMART_WKUP? */
1435 if (oh
->flags
& HWMOD_SWSUP_SIDLE
||
1436 !(oh
->class->sysc
->idlemodes
&
1437 (SIDLE_SMART
| SIDLE_SMART_WKUP
)))
1438 idlemode
= HWMOD_IDLEMODE_FORCE
;
1440 idlemode
= HWMOD_IDLEMODE_SMART
;
1441 _set_slave_idlemode(oh
, idlemode
, &v
);
1444 if (sf
& SYSC_HAS_MIDLEMODE
) {
1445 if ((oh
->flags
& HWMOD_SWSUP_MSTANDBY
) ||
1446 (oh
->flags
& HWMOD_FORCE_MSTANDBY
)) {
1447 idlemode
= HWMOD_IDLEMODE_FORCE
;
1449 if (sf
& SYSC_HAS_ENAWAKEUP
)
1450 _enable_wakeup(oh
, &v
);
1451 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1452 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1454 idlemode
= HWMOD_IDLEMODE_SMART
;
1456 _set_master_standbymode(oh
, idlemode
, &v
);
1459 /* If slave is in SMARTIDLE, also enable wakeup */
1460 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1461 _enable_wakeup(oh
, &v
);
1463 _write_sysconfig(v
, oh
);
1467 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1468 * @oh: struct omap_hwmod *
1470 * Force the module into slave idle and master suspend. No return
1473 static void _shutdown_sysc(struct omap_hwmod
*oh
)
1478 if (!oh
->class->sysc
)
1481 v
= oh
->_sysc_cache
;
1482 sf
= oh
->class->sysc
->sysc_flags
;
1484 if (sf
& SYSC_HAS_SIDLEMODE
)
1485 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1487 if (sf
& SYSC_HAS_MIDLEMODE
)
1488 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1490 if (sf
& SYSC_HAS_AUTOIDLE
)
1491 _set_module_autoidle(oh
, 1, &v
);
1493 _write_sysconfig(v
, oh
);
1497 * _lookup - find an omap_hwmod by name
1498 * @name: find an omap_hwmod by name
1500 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1502 static struct omap_hwmod
*_lookup(const char *name
)
1504 struct omap_hwmod
*oh
, *temp_oh
;
1508 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1509 if (!strcmp(name
, temp_oh
->name
)) {
1519 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1520 * @oh: struct omap_hwmod *
1522 * Convert a clockdomain name stored in a struct omap_hwmod into a
1523 * clockdomain pointer, and save it into the struct omap_hwmod.
1524 * Return -EINVAL if the clkdm_name lookup failed.
1526 static int _init_clkdm(struct omap_hwmod
*oh
)
1528 if (!oh
->clkdm_name
) {
1529 pr_debug("omap_hwmod: %s: missing clockdomain\n", oh
->name
);
1533 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1535 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1536 oh
->name
, oh
->clkdm_name
);
1540 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1541 oh
->name
, oh
->clkdm_name
);
1547 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1548 * well the clockdomain.
1549 * @oh: struct omap_hwmod *
1550 * @data: not used; pass NULL
1552 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1553 * Resolves all clock names embedded in the hwmod. Returns 0 on
1554 * success, or a negative error code on failure.
1556 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1560 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1563 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1565 if (soc_ops
.init_clkdm
)
1566 ret
|= soc_ops
.init_clkdm(oh
);
1568 ret
|= _init_main_clk(oh
);
1569 ret
|= _init_interface_clks(oh
);
1570 ret
|= _init_opt_clks(oh
);
1573 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1575 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1581 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1582 * @oh: struct omap_hwmod *
1583 * @name: name of the reset line in the context of this hwmod
1584 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1586 * Return the bit position of the reset line that match the
1587 * input name. Return -ENOENT if not found.
1589 static int _lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1590 struct omap_hwmod_rst_info
*ohri
)
1594 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1595 const char *rst_line
= oh
->rst_lines
[i
].name
;
1596 if (!strcmp(rst_line
, name
)) {
1597 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1598 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1599 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1600 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1611 * _assert_hardreset - assert the HW reset line of submodules
1612 * contained in the hwmod module.
1613 * @oh: struct omap_hwmod *
1614 * @name: name of the reset line to lookup and assert
1616 * Some IP like dsp, ipu or iva contain processor that require an HW
1617 * reset line to be assert / deassert in order to enable fully the IP.
1618 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1619 * asserting the hardreset line on the currently-booted SoC, or passes
1620 * along the return value from _lookup_hardreset() or the SoC's
1621 * assert_hardreset code.
1623 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1625 struct omap_hwmod_rst_info ohri
;
1631 if (!soc_ops
.assert_hardreset
)
1634 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1638 ret
= soc_ops
.assert_hardreset(oh
, &ohri
);
1644 * _deassert_hardreset - deassert the HW reset line of submodules contained
1645 * in the hwmod module.
1646 * @oh: struct omap_hwmod *
1647 * @name: name of the reset line to look up and deassert
1649 * Some IP like dsp, ipu or iva contain processor that require an HW
1650 * reset line to be assert / deassert in order to enable fully the IP.
1651 * Returns -EINVAL if @oh is null, -ENOSYS if we have no way of
1652 * deasserting the hardreset line on the currently-booted SoC, or passes
1653 * along the return value from _lookup_hardreset() or the SoC's
1654 * deassert_hardreset code.
1656 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1658 struct omap_hwmod_rst_info ohri
;
1665 if (!soc_ops
.deassert_hardreset
)
1668 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1669 if (IS_ERR_VALUE(ret
))
1674 * A clockdomain must be in SW_SUP otherwise reset
1675 * might not be completed. The clockdomain can be set
1676 * in HW_AUTO only when the module become ready.
1678 hwsup
= clkdm_in_hwsup(oh
->clkdm
);
1679 ret
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
1681 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1682 oh
->name
, oh
->clkdm
->name
, ret
);
1688 if (soc_ops
.enable_module
)
1689 soc_ops
.enable_module(oh
);
1691 ret
= soc_ops
.deassert_hardreset(oh
, &ohri
);
1693 if (soc_ops
.disable_module
)
1694 soc_ops
.disable_module(oh
);
1695 _disable_clocks(oh
);
1698 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1702 * Set the clockdomain to HW_AUTO, assuming that the
1703 * previous state was HW_AUTO.
1705 if (oh
->clkdm
&& hwsup
)
1706 clkdm_allow_idle(oh
->clkdm
);
1709 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1716 * _read_hardreset - read the HW reset line state of submodules
1717 * contained in the hwmod module
1718 * @oh: struct omap_hwmod *
1719 * @name: name of the reset line to look up and read
1721 * Return the state of the reset line. Returns -EINVAL if @oh is
1722 * null, -ENOSYS if we have no way of reading the hardreset line
1723 * status on the currently-booted SoC, or passes along the return
1724 * value from _lookup_hardreset() or the SoC's is_hardreset_asserted
1727 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1729 struct omap_hwmod_rst_info ohri
;
1735 if (!soc_ops
.is_hardreset_asserted
)
1738 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1742 return soc_ops
.is_hardreset_asserted(oh
, &ohri
);
1746 * _are_all_hardreset_lines_asserted - return true if the @oh is hard-reset
1747 * @oh: struct omap_hwmod *
1749 * If all hardreset lines associated with @oh are asserted, then return true.
1750 * Otherwise, if part of @oh is out hardreset or if no hardreset lines
1751 * associated with @oh are asserted, then return false.
1752 * This function is used to avoid executing some parts of the IP block
1753 * enable/disable sequence if its hardreset line is set.
1755 static bool _are_all_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1759 if (oh
->rst_lines_cnt
== 0)
1762 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1763 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1766 if (oh
->rst_lines_cnt
== rst_cnt
)
1773 * _are_any_hardreset_lines_asserted - return true if any part of @oh is
1775 * @oh: struct omap_hwmod *
1777 * If any hardreset lines associated with @oh are asserted, then
1778 * return true. Otherwise, if no hardreset lines associated with @oh
1779 * are asserted, or if @oh has no hardreset lines, then return false.
1780 * This function is used to avoid executing some parts of the IP block
1781 * enable/disable sequence if any hardreset line is set.
1783 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1788 for (i
= 0; i
< oh
->rst_lines_cnt
&& rst_cnt
== 0; i
++)
1789 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1792 return (rst_cnt
) ? true : false;
1796 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1797 * @oh: struct omap_hwmod *
1799 * Disable the PRCM module mode related to the hwmod @oh.
1800 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1802 static int _omap4_disable_module(struct omap_hwmod
*oh
)
1806 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1810 * Since integration code might still be doing something, only
1811 * disable if all lines are under hardreset.
1813 if (_are_any_hardreset_lines_asserted(oh
))
1816 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1818 omap4_cminst_module_disable(oh
->clkdm
->prcm_partition
,
1820 oh
->clkdm
->clkdm_offs
,
1821 oh
->prcm
.omap4
.clkctrl_offs
);
1823 v
= _omap4_wait_target_disable(oh
);
1825 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1832 * _am33xx_disable_module - enable CLKCTRL modulemode on AM33XX
1833 * @oh: struct omap_hwmod *
1835 * Disable the PRCM module mode related to the hwmod @oh.
1836 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1838 static int _am33xx_disable_module(struct omap_hwmod
*oh
)
1842 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1845 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1847 if (_are_any_hardreset_lines_asserted(oh
))
1850 am33xx_cm_module_disable(oh
->clkdm
->cm_inst
, oh
->clkdm
->clkdm_offs
,
1851 oh
->prcm
.omap4
.clkctrl_offs
);
1853 v
= _am33xx_wait_target_disable(oh
);
1855 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1862 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1863 * @oh: struct omap_hwmod *
1865 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1866 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1867 * reset this way, -EINVAL if the hwmod is in the wrong state,
1868 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1870 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1871 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1872 * use the SYSCONFIG softreset bit to provide the status.
1874 * Note that some IP like McBSP do have reset control but don't have
1877 static int _ocp_softreset(struct omap_hwmod
*oh
)
1883 if (!oh
->class->sysc
||
1884 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1887 /* clocks must be on for this operation */
1888 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1889 pr_warn("omap_hwmod: %s: reset can only be entered from enabled state\n",
1894 /* For some modules, all optionnal clocks need to be enabled as well */
1895 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1896 _enable_optional_clocks(oh
);
1898 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1900 v
= oh
->_sysc_cache
;
1901 ret
= _set_softreset(oh
, &v
);
1904 _write_sysconfig(v
, oh
);
1906 if (oh
->class->sysc
->srst_udelay
)
1907 udelay(oh
->class->sysc
->srst_udelay
);
1909 c
= _wait_softreset_complete(oh
);
1910 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1911 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1912 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1914 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1917 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1918 * _wait_target_ready() or _reset()
1921 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1924 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1925 _disable_optional_clocks(oh
);
1931 * _reset - reset an omap_hwmod
1932 * @oh: struct omap_hwmod *
1934 * Resets an omap_hwmod @oh. If the module has a custom reset
1935 * function pointer defined, then call it to reset the IP block, and
1936 * pass along its return value to the caller. Otherwise, if the IP
1937 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1938 * associated with it, call a function to reset the IP block via that
1939 * method, and pass along the return value to the caller. Finally, if
1940 * the IP block has some hardreset lines associated with it, assert
1941 * all of those, but do _not_ deassert them. (This is because driver
1942 * authors have expressed an apparent requirement to control the
1943 * deassertion of the hardreset lines themselves.)
1945 * The default software reset mechanism for most OMAP IP blocks is
1946 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1947 * hwmods cannot be reset via this method. Some are not targets and
1948 * therefore have no OCP header registers to access. Others (like the
1949 * IVA) have idiosyncratic reset sequences. So for these relatively
1950 * rare cases, custom reset code can be supplied in the struct
1951 * omap_hwmod_class .reset function pointer.
1953 * _set_dmadisable() is called to set the DMADISABLE bit so that it
1954 * does not prevent idling of the system. This is necessary for cases
1955 * where ROMCODE/BOOTLOADER uses dma and transfers control to the
1956 * kernel without disabling dma.
1958 * Passes along the return value from either _ocp_softreset() or the
1959 * custom reset function - these must return -EINVAL if the hwmod
1960 * cannot be reset this way or if the hwmod is in the wrong state,
1961 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1963 static int _reset(struct omap_hwmod
*oh
)
1967 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1969 if (oh
->class->reset
) {
1970 r
= oh
->class->reset(oh
);
1972 if (oh
->rst_lines_cnt
> 0) {
1973 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1974 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
1977 r
= _ocp_softreset(oh
);
1983 _set_dmadisable(oh
);
1986 * OCP_SYSCONFIG bits need to be reprogrammed after a
1987 * softreset. The _enable() function should be split to avoid
1988 * the rewrite of the OCP_SYSCONFIG register.
1990 if (oh
->class->sysc
) {
1991 _update_sysc_cache(oh
);
1999 * _reconfigure_io_chain - clear any I/O chain wakeups and reconfigure chain
2001 * Call the appropriate PRM function to clear any logged I/O chain
2002 * wakeups and to reconfigure the chain. This apparently needs to be
2003 * done upon every mux change. Since hwmods can be concurrently
2004 * enabled and idled, hold a spinlock around the I/O chain
2005 * reconfiguration sequence. No return value.
2007 * XXX When the PRM code is moved to drivers, this function can be removed,
2008 * as the PRM infrastructure should abstract this.
2010 static void _reconfigure_io_chain(void)
2012 unsigned long flags
;
2014 spin_lock_irqsave(&io_chain_lock
, flags
);
2016 if (cpu_is_omap34xx() && omap3_has_io_chain_ctrl())
2017 omap3xxx_prm_reconfigure_io_chain();
2018 else if (cpu_is_omap44xx())
2019 omap44xx_prm_reconfigure_io_chain();
2021 spin_unlock_irqrestore(&io_chain_lock
, flags
);
2025 * _omap4_update_context_lost - increment hwmod context loss counter if
2026 * hwmod context was lost, and clear hardware context loss reg
2027 * @oh: hwmod to check for context loss
2029 * If the PRCM indicates that the hwmod @oh lost context, increment
2030 * our in-memory context loss counter, and clear the RM_*_CONTEXT
2031 * bits. No return value.
2033 static void _omap4_update_context_lost(struct omap_hwmod
*oh
)
2035 if (oh
->prcm
.omap4
.flags
& HWMOD_OMAP4_NO_CONTEXT_LOSS_BIT
)
2038 if (!prm_was_any_context_lost_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2039 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2040 oh
->prcm
.omap4
.context_offs
))
2043 oh
->prcm
.omap4
.context_lost_counter
++;
2044 prm_clear_context_loss_flags_old(oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2045 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2046 oh
->prcm
.omap4
.context_offs
);
2050 * _omap4_get_context_lost - get context loss counter for a hwmod
2051 * @oh: hwmod to get context loss counter for
2053 * Returns the in-memory context loss counter for a hwmod.
2055 static int _omap4_get_context_lost(struct omap_hwmod
*oh
)
2057 return oh
->prcm
.omap4
.context_lost_counter
;
2061 * _enable_preprogram - Pre-program an IP block during the _enable() process
2062 * @oh: struct omap_hwmod *
2064 * Some IP blocks (such as AESS) require some additional programming
2065 * after enable before they can enter idle. If a function pointer to
2066 * do so is present in the hwmod data, then call it and pass along the
2067 * return value; otherwise, return 0.
2069 static int __init
_enable_preprogram(struct omap_hwmod
*oh
)
2071 if (!oh
->class->enable_preprogram
)
2074 return oh
->class->enable_preprogram(oh
);
2078 * _enable - enable an omap_hwmod
2079 * @oh: struct omap_hwmod *
2081 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
2082 * register target. Returns -EINVAL if the hwmod is in the wrong
2083 * state or passes along the return value of _wait_target_ready().
2085 static int _enable(struct omap_hwmod
*oh
)
2090 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
2093 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
2094 * state at init. Now that someone is really trying to enable
2095 * them, just ensure that the hwmod mux is set.
2097 if (oh
->_int_flags
& _HWMOD_SKIP_ENABLE
) {
2099 * If the caller has mux data populated, do the mux'ing
2100 * which wouldn't have been done as part of the _enable()
2101 * done during setup.
2104 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2106 oh
->_int_flags
&= ~_HWMOD_SKIP_ENABLE
;
2110 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
2111 oh
->_state
!= _HWMOD_STATE_IDLE
&&
2112 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
2113 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
2119 * If an IP block contains HW reset lines and all of them are
2120 * asserted, we let integration code associated with that
2121 * block handle the enable. We've received very little
2122 * information on what those driver authors need, and until
2123 * detailed information is provided and the driver code is
2124 * posted to the public lists, this is probably the best we
2127 if (_are_all_hardreset_lines_asserted(oh
))
2130 /* Mux pins for device runtime if populated */
2131 if (oh
->mux
&& (!oh
->mux
->enabled
||
2132 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
2133 oh
->mux
->pads_dynamic
))) {
2134 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
2135 _reconfigure_io_chain();
2138 _add_initiator_dep(oh
, mpu_oh
);
2142 * A clockdomain must be in SW_SUP before enabling
2143 * completely the module. The clockdomain can be set
2144 * in HW_AUTO only when the module become ready.
2146 hwsup
= clkdm_in_hwsup(oh
->clkdm
) &&
2147 !clkdm_missing_idle_reporting(oh
->clkdm
);
2148 r
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
2150 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
2151 oh
->name
, oh
->clkdm
->name
, r
);
2157 if (soc_ops
.enable_module
)
2158 soc_ops
.enable_module(oh
);
2159 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2162 if (soc_ops
.update_context_lost
)
2163 soc_ops
.update_context_lost(oh
);
2165 r
= (soc_ops
.wait_target_ready
) ? soc_ops
.wait_target_ready(oh
) :
2169 * Set the clockdomain to HW_AUTO only if the target is ready,
2170 * assuming that the previous state was HW_AUTO
2172 if (oh
->clkdm
&& hwsup
)
2173 clkdm_allow_idle(oh
->clkdm
);
2175 oh
->_state
= _HWMOD_STATE_ENABLED
;
2177 /* Access the sysconfig only if the target is ready */
2178 if (oh
->class->sysc
) {
2179 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
2180 _update_sysc_cache(oh
);
2183 r
= _enable_preprogram(oh
);
2185 if (soc_ops
.disable_module
)
2186 soc_ops
.disable_module(oh
);
2187 _disable_clocks(oh
);
2188 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
2192 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2199 * _idle - idle an omap_hwmod
2200 * @oh: struct omap_hwmod *
2202 * Idles an omap_hwmod @oh. This should be called once the hwmod has
2203 * no further work. Returns -EINVAL if the hwmod is in the wrong
2204 * state or returns 0.
2206 static int _idle(struct omap_hwmod
*oh
)
2208 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
2210 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2211 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
2216 if (_are_all_hardreset_lines_asserted(oh
))
2219 if (oh
->class->sysc
)
2221 _del_initiator_dep(oh
, mpu_oh
);
2223 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2225 if (soc_ops
.disable_module
)
2226 soc_ops
.disable_module(oh
);
2229 * The module must be in idle mode before disabling any parents
2230 * clocks. Otherwise, the parent clock might be disabled before
2231 * the module transition is done, and thus will prevent the
2232 * transition to complete properly.
2234 _disable_clocks(oh
);
2236 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2238 /* Mux pins for device idle if populated */
2239 if (oh
->mux
&& oh
->mux
->pads_dynamic
) {
2240 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
2241 _reconfigure_io_chain();
2244 oh
->_state
= _HWMOD_STATE_IDLE
;
2250 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
2251 * @oh: struct omap_hwmod *
2252 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
2254 * Sets the IP block's OCP autoidle bit in hardware, and updates our
2255 * local copy. Intended to be used by drivers that require
2256 * direct manipulation of the AUTOIDLE bits.
2257 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
2258 * along the return value from _set_module_autoidle().
2260 * Any users of this function should be scrutinized carefully.
2262 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod
*oh
, u8 autoidle
)
2266 unsigned long flags
;
2268 if (!oh
|| oh
->_state
!= _HWMOD_STATE_ENABLED
)
2271 spin_lock_irqsave(&oh
->_lock
, flags
);
2273 v
= oh
->_sysc_cache
;
2275 retval
= _set_module_autoidle(oh
, autoidle
, &v
);
2278 _write_sysconfig(v
, oh
);
2280 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2286 * _shutdown - shutdown an omap_hwmod
2287 * @oh: struct omap_hwmod *
2289 * Shut down an omap_hwmod @oh. This should be called when the driver
2290 * used for the hwmod is removed or unloaded or if the driver is not
2291 * used by the system. Returns -EINVAL if the hwmod is in the wrong
2292 * state or returns 0.
2294 static int _shutdown(struct omap_hwmod
*oh
)
2299 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
2300 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
2301 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
2306 if (_are_all_hardreset_lines_asserted(oh
))
2309 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
2311 if (oh
->class->pre_shutdown
) {
2312 prev_state
= oh
->_state
;
2313 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2315 ret
= oh
->class->pre_shutdown(oh
);
2317 if (prev_state
== _HWMOD_STATE_IDLE
)
2323 if (oh
->class->sysc
) {
2324 if (oh
->_state
== _HWMOD_STATE_IDLE
)
2329 /* clocks and deps are already disabled in idle */
2330 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
2331 _del_initiator_dep(oh
, mpu_oh
);
2332 /* XXX what about the other system initiators here? dma, dsp */
2333 if (oh
->flags
& HWMOD_BLOCK_WFI
)
2335 if (soc_ops
.disable_module
)
2336 soc_ops
.disable_module(oh
);
2337 _disable_clocks(oh
);
2339 clkdm_hwmod_disable(oh
->clkdm
, oh
);
2341 /* XXX Should this code also force-disable the optional clocks? */
2343 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
2344 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
2346 /* Mux pins to safe mode or use populated off mode values */
2348 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
2350 oh
->_state
= _HWMOD_STATE_DISABLED
;
2356 * _init_mpu_rt_base - populate the virtual address for a hwmod
2357 * @oh: struct omap_hwmod * to locate the virtual address
2359 * Cache the virtual address used by the MPU to access this IP block's
2360 * registers. This address is needed early so the OCP registers that
2361 * are part of the device's address space can be ioremapped properly.
2364 static void __init
_init_mpu_rt_base(struct omap_hwmod
*oh
, void *data
)
2366 struct omap_hwmod_addr_space
*mem
;
2367 void __iomem
*va_start
;
2372 _save_mpu_port_index(oh
);
2374 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2377 mem
= _find_mpu_rt_addr_space(oh
);
2379 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2384 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
2386 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
2390 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2391 oh
->name
, va_start
);
2393 oh
->_mpu_rt_va
= va_start
;
2397 * _init - initialize internal data for the hwmod @oh
2398 * @oh: struct omap_hwmod *
2401 * Look up the clocks and the address space used by the MPU to access
2402 * registers belonging to the hwmod @oh. @oh must already be
2403 * registered at this point. This is the first of two phases for
2404 * hwmod initialization. Code called here does not touch any hardware
2405 * registers, it simply prepares internal data structures. Returns 0
2406 * upon success or if the hwmod isn't registered, or -EINVAL upon
2409 static int __init
_init(struct omap_hwmod
*oh
, void *data
)
2413 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
2416 _init_mpu_rt_base(oh
, NULL
);
2418 r
= _init_clocks(oh
, NULL
);
2419 if (IS_ERR_VALUE(r
)) {
2420 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh
->name
);
2424 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
2430 * _setup_iclk_autoidle - configure an IP block's interface clocks
2431 * @oh: struct omap_hwmod *
2433 * Set up the module's interface clocks. XXX This function is still mostly
2434 * a stub; implementing this properly requires iclk autoidle usecounting in
2435 * the clock code. No return value.
2437 static void __init
_setup_iclk_autoidle(struct omap_hwmod
*oh
)
2439 struct omap_hwmod_ocp_if
*os
;
2440 struct list_head
*p
;
2442 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2445 p
= oh
->slave_ports
.next
;
2447 while (i
< oh
->slaves_cnt
) {
2448 os
= _fetch_next_ocp_if(&p
, &i
);
2452 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
2453 /* XXX omap_iclk_deny_idle(c); */
2455 /* XXX omap_iclk_allow_idle(c); */
2456 clk_enable(os
->_clk
);
2464 * _setup_reset - reset an IP block during the setup process
2465 * @oh: struct omap_hwmod *
2467 * Reset the IP block corresponding to the hwmod @oh during the setup
2468 * process. The IP block is first enabled so it can be successfully
2469 * reset. Returns 0 upon success or a negative error code upon
2472 static int __init
_setup_reset(struct omap_hwmod
*oh
)
2476 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2479 if (oh
->flags
& HWMOD_EXT_OPT_MAIN_CLK
)
2482 if (oh
->rst_lines_cnt
== 0) {
2485 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2486 oh
->name
, oh
->_state
);
2491 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
))
2498 * _setup_postsetup - transition to the appropriate state after _setup
2499 * @oh: struct omap_hwmod *
2501 * Place an IP block represented by @oh into a "post-setup" state --
2502 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2503 * this function is called at the end of _setup().) The postsetup
2504 * state for an IP block can be changed by calling
2505 * omap_hwmod_enter_postsetup_state() early in the boot process,
2506 * before one of the omap_hwmod_setup*() functions are called for the
2509 * The IP block stays in this state until a PM runtime-based driver is
2510 * loaded for that IP block. A post-setup state of IDLE is
2511 * appropriate for almost all IP blocks with runtime PM-enabled
2512 * drivers, since those drivers are able to enable the IP block. A
2513 * post-setup state of ENABLED is appropriate for kernels with PM
2514 * runtime disabled. The DISABLED state is appropriate for unusual IP
2515 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2516 * included, since the WDTIMER starts running on reset and will reset
2517 * the MPU if left active.
2519 * This post-setup mechanism is deprecated. Once all of the OMAP
2520 * drivers have been converted to use PM runtime, and all of the IP
2521 * block data and interconnect data is available to the hwmod code, it
2522 * should be possible to replace this mechanism with a "lazy reset"
2523 * arrangement. In a "lazy reset" setup, each IP block is enabled
2524 * when the driver first probes, then all remaining IP blocks without
2525 * drivers are either shut down or enabled after the drivers have
2526 * loaded. However, this cannot take place until the above
2527 * preconditions have been met, since otherwise the late reset code
2528 * has no way of knowing which IP blocks are in use by drivers, and
2529 * which ones are unused.
2533 static void __init
_setup_postsetup(struct omap_hwmod
*oh
)
2537 if (oh
->rst_lines_cnt
> 0)
2540 postsetup_state
= oh
->_postsetup_state
;
2541 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
2542 postsetup_state
= _HWMOD_STATE_ENABLED
;
2545 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2546 * it should be set by the core code as a runtime flag during startup
2548 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
2549 (postsetup_state
== _HWMOD_STATE_IDLE
)) {
2550 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2551 postsetup_state
= _HWMOD_STATE_ENABLED
;
2554 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2556 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2558 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2559 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2560 oh
->name
, postsetup_state
);
2566 * _setup - prepare IP block hardware for use
2567 * @oh: struct omap_hwmod *
2568 * @n: (unused, pass NULL)
2570 * Configure the IP block represented by @oh. This may include
2571 * enabling the IP block, resetting it, and placing it into a
2572 * post-setup state, depending on the type of IP block and applicable
2573 * flags. IP blocks are reset to prevent any previous configuration
2574 * by the bootloader or previous operating system from interfering
2575 * with power management or other parts of the system. The reset can
2576 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2577 * two phases for hwmod initialization. Code called here generally
2578 * affects the IP block hardware, or system integration hardware
2579 * associated with the IP block. Returns 0.
2581 static int __init
_setup(struct omap_hwmod
*oh
, void *data
)
2583 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2586 _setup_iclk_autoidle(oh
);
2588 if (!_setup_reset(oh
))
2589 _setup_postsetup(oh
);
2595 * _register - register a struct omap_hwmod
2596 * @oh: struct omap_hwmod *
2598 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2599 * already has been registered by the same name; -EINVAL if the
2600 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2601 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2602 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2605 * XXX The data should be copied into bootmem, so the original data
2606 * should be marked __initdata and freed after init. This would allow
2607 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2608 * that the copy process would be relatively complex due to the large number
2611 static int __init
_register(struct omap_hwmod
*oh
)
2613 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
2614 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
2617 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
2619 if (_lookup(oh
->name
))
2622 list_add_tail(&oh
->node
, &omap_hwmod_list
);
2624 INIT_LIST_HEAD(&oh
->master_ports
);
2625 INIT_LIST_HEAD(&oh
->slave_ports
);
2626 spin_lock_init(&oh
->_lock
);
2628 oh
->_state
= _HWMOD_STATE_REGISTERED
;
2631 * XXX Rather than doing a strcmp(), this should test a flag
2632 * set in the hwmod data, inserted by the autogenerator code.
2634 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
2641 * _alloc_links - return allocated memory for hwmod links
2642 * @ml: pointer to a struct omap_hwmod_link * for the master link
2643 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2645 * Return pointers to two struct omap_hwmod_link records, via the
2646 * addresses pointed to by @ml and @sl. Will first attempt to return
2647 * memory allocated as part of a large initial block, but if that has
2648 * been exhausted, will allocate memory itself. Since ideally this
2649 * second allocation path will never occur, the number of these
2650 * 'supplemental' allocations will be logged when debugging is
2651 * enabled. Returns 0.
2653 static int __init
_alloc_links(struct omap_hwmod_link
**ml
,
2654 struct omap_hwmod_link
**sl
)
2658 if ((free_ls
+ LINKS_PER_OCP_IF
) <= max_ls
) {
2659 *ml
= &linkspace
[free_ls
++];
2660 *sl
= &linkspace
[free_ls
++];
2664 sz
= sizeof(struct omap_hwmod_link
) * LINKS_PER_OCP_IF
;
2667 *ml
= alloc_bootmem(sz
);
2671 *sl
= (void *)(*ml
) + sizeof(struct omap_hwmod_link
);
2674 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2675 ls_supp
* LINKS_PER_OCP_IF
);
2681 * _add_link - add an interconnect between two IP blocks
2682 * @oi: pointer to a struct omap_hwmod_ocp_if record
2684 * Add struct omap_hwmod_link records connecting the master IP block
2685 * specified in @oi->master to @oi, and connecting the slave IP block
2686 * specified in @oi->slave to @oi. This code is assumed to run before
2687 * preemption or SMP has been enabled, thus avoiding the need for
2688 * locking in this code. Changes to this assumption will require
2689 * additional locking. Returns 0.
2691 static int __init
_add_link(struct omap_hwmod_ocp_if
*oi
)
2693 struct omap_hwmod_link
*ml
, *sl
;
2695 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi
->master
->name
,
2698 _alloc_links(&ml
, &sl
);
2701 INIT_LIST_HEAD(&ml
->node
);
2702 list_add(&ml
->node
, &oi
->master
->master_ports
);
2703 oi
->master
->masters_cnt
++;
2706 INIT_LIST_HEAD(&sl
->node
);
2707 list_add(&sl
->node
, &oi
->slave
->slave_ports
);
2708 oi
->slave
->slaves_cnt
++;
2714 * _register_link - register a struct omap_hwmod_ocp_if
2715 * @oi: struct omap_hwmod_ocp_if *
2717 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2718 * has already been registered; -EINVAL if @oi is NULL or if the
2719 * record pointed to by @oi is missing required fields; or 0 upon
2722 * XXX The data should be copied into bootmem, so the original data
2723 * should be marked __initdata and freed after init. This would allow
2724 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2726 static int __init
_register_link(struct omap_hwmod_ocp_if
*oi
)
2728 if (!oi
|| !oi
->master
|| !oi
->slave
|| !oi
->user
)
2731 if (oi
->_int_flags
& _OCPIF_INT_FLAGS_REGISTERED
)
2734 pr_debug("omap_hwmod: registering link from %s to %s\n",
2735 oi
->master
->name
, oi
->slave
->name
);
2738 * Register the connected hwmods, if they haven't been
2739 * registered already
2741 if (oi
->master
->_state
!= _HWMOD_STATE_REGISTERED
)
2742 _register(oi
->master
);
2744 if (oi
->slave
->_state
!= _HWMOD_STATE_REGISTERED
)
2745 _register(oi
->slave
);
2749 oi
->_int_flags
|= _OCPIF_INT_FLAGS_REGISTERED
;
2755 * _alloc_linkspace - allocate large block of hwmod links
2756 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2758 * Allocate a large block of struct omap_hwmod_link records. This
2759 * improves boot time significantly by avoiding the need to allocate
2760 * individual records one by one. If the number of records to
2761 * allocate in the block hasn't been manually specified, this function
2762 * will count the number of struct omap_hwmod_ocp_if records in @ois
2763 * and use that to determine the allocation size. For SoC families
2764 * that require multiple list registrations, such as OMAP3xxx, this
2765 * estimation process isn't optimal, so manual estimation is advised
2766 * in those cases. Returns -EEXIST if the allocation has already occurred
2767 * or 0 upon success.
2769 static int __init
_alloc_linkspace(struct omap_hwmod_ocp_if
**ois
)
2775 WARN(1, "linkspace already allocated\n");
2781 max_ls
+= LINKS_PER_OCP_IF
;
2783 sz
= sizeof(struct omap_hwmod_link
) * max_ls
;
2785 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2786 __func__
, sz
, max_ls
);
2788 linkspace
= alloc_bootmem(sz
);
2790 memset(linkspace
, 0, sz
);
2795 /* Static functions intended only for use in soc_ops field function pointers */
2798 * _omap2xxx_wait_target_ready - wait for a module to leave slave idle
2799 * @oh: struct omap_hwmod *
2801 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2802 * does not have an IDLEST bit or if the module successfully leaves
2803 * slave idle; otherwise, pass along the return value of the
2804 * appropriate *_cm*_wait_module_ready() function.
2806 static int _omap2xxx_wait_target_ready(struct omap_hwmod
*oh
)
2811 if (oh
->flags
& HWMOD_NO_IDLEST
)
2814 if (!_find_mpu_rt_port(oh
))
2817 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2819 return omap2xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2820 oh
->prcm
.omap2
.idlest_reg_id
,
2821 oh
->prcm
.omap2
.idlest_idle_bit
);
2825 * _omap3xxx_wait_target_ready - wait for a module to leave slave idle
2826 * @oh: struct omap_hwmod *
2828 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2829 * does not have an IDLEST bit or if the module successfully leaves
2830 * slave idle; otherwise, pass along the return value of the
2831 * appropriate *_cm*_wait_module_ready() function.
2833 static int _omap3xxx_wait_target_ready(struct omap_hwmod
*oh
)
2838 if (oh
->flags
& HWMOD_NO_IDLEST
)
2841 if (!_find_mpu_rt_port(oh
))
2844 /* XXX check module SIDLEMODE, hardreset status, enabled clocks */
2846 return omap3xxx_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
2847 oh
->prcm
.omap2
.idlest_reg_id
,
2848 oh
->prcm
.omap2
.idlest_idle_bit
);
2852 * _omap4_wait_target_ready - wait for a module to leave slave idle
2853 * @oh: struct omap_hwmod *
2855 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2856 * does not have an IDLEST bit or if the module successfully leaves
2857 * slave idle; otherwise, pass along the return value of the
2858 * appropriate *_cm*_wait_module_ready() function.
2860 static int _omap4_wait_target_ready(struct omap_hwmod
*oh
)
2865 if (oh
->flags
& HWMOD_NO_IDLEST
|| !oh
->clkdm
)
2868 if (!_find_mpu_rt_port(oh
))
2871 /* XXX check module SIDLEMODE, hardreset status */
2873 return omap4_cminst_wait_module_ready(oh
->clkdm
->prcm_partition
,
2875 oh
->clkdm
->clkdm_offs
,
2876 oh
->prcm
.omap4
.clkctrl_offs
);
2880 * _am33xx_wait_target_ready - wait for a module to leave slave idle
2881 * @oh: struct omap_hwmod *
2883 * Wait for a module @oh to leave slave idle. Returns 0 if the module
2884 * does not have an IDLEST bit or if the module successfully leaves
2885 * slave idle; otherwise, pass along the return value of the
2886 * appropriate *_cm*_wait_module_ready() function.
2888 static int _am33xx_wait_target_ready(struct omap_hwmod
*oh
)
2890 if (!oh
|| !oh
->clkdm
)
2893 if (oh
->flags
& HWMOD_NO_IDLEST
)
2896 if (!_find_mpu_rt_port(oh
))
2899 /* XXX check module SIDLEMODE, hardreset status */
2901 return am33xx_cm_wait_module_ready(oh
->clkdm
->cm_inst
,
2902 oh
->clkdm
->clkdm_offs
,
2903 oh
->prcm
.omap4
.clkctrl_offs
);
2907 * _omap2_assert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2908 * @oh: struct omap_hwmod * to assert hardreset
2909 * @ohri: hardreset line data
2911 * Call omap2_prm_assert_hardreset() with parameters extracted from
2912 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2913 * use as an soc_ops function pointer. Passes along the return value
2914 * from omap2_prm_assert_hardreset(). XXX This function is scheduled
2915 * for removal when the PRM code is moved into drivers/.
2917 static int _omap2_assert_hardreset(struct omap_hwmod
*oh
,
2918 struct omap_hwmod_rst_info
*ohri
)
2920 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
2925 * _omap2_deassert_hardreset - call OMAP2 PRM hardreset fn with hwmod args
2926 * @oh: struct omap_hwmod * to deassert hardreset
2927 * @ohri: hardreset line data
2929 * Call omap2_prm_deassert_hardreset() with parameters extracted from
2930 * the hwmod @oh and the hardreset line data @ohri. Only intended for
2931 * use as an soc_ops function pointer. Passes along the return value
2932 * from omap2_prm_deassert_hardreset(). XXX This function is
2933 * scheduled for removal when the PRM code is moved into drivers/.
2935 static int _omap2_deassert_hardreset(struct omap_hwmod
*oh
,
2936 struct omap_hwmod_rst_info
*ohri
)
2938 return omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
2944 * _omap2_is_hardreset_asserted - call OMAP2 PRM hardreset fn with hwmod args
2945 * @oh: struct omap_hwmod * to test hardreset
2946 * @ohri: hardreset line data
2948 * Call omap2_prm_is_hardreset_asserted() with parameters extracted
2949 * from the hwmod @oh and the hardreset line data @ohri. Only
2950 * intended for use as an soc_ops function pointer. Passes along the
2951 * return value from omap2_prm_is_hardreset_asserted(). XXX This
2952 * function is scheduled for removal when the PRM code is moved into
2955 static int _omap2_is_hardreset_asserted(struct omap_hwmod
*oh
,
2956 struct omap_hwmod_rst_info
*ohri
)
2958 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
2963 * _omap4_assert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2964 * @oh: struct omap_hwmod * to assert hardreset
2965 * @ohri: hardreset line data
2967 * Call omap4_prminst_assert_hardreset() with parameters extracted
2968 * from the hwmod @oh and the hardreset line data @ohri. Only
2969 * intended for use as an soc_ops function pointer. Passes along the
2970 * return value from omap4_prminst_assert_hardreset(). XXX This
2971 * function is scheduled for removal when the PRM code is moved into
2974 static int _omap4_assert_hardreset(struct omap_hwmod
*oh
,
2975 struct omap_hwmod_rst_info
*ohri
)
2980 return omap4_prminst_assert_hardreset(ohri
->rst_shift
,
2981 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
2982 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
2983 oh
->prcm
.omap4
.rstctrl_offs
);
2987 * _omap4_deassert_hardreset - call OMAP4 PRM hardreset fn with hwmod args
2988 * @oh: struct omap_hwmod * to deassert hardreset
2989 * @ohri: hardreset line data
2991 * Call omap4_prminst_deassert_hardreset() with parameters extracted
2992 * from the hwmod @oh and the hardreset line data @ohri. Only
2993 * intended for use as an soc_ops function pointer. Passes along the
2994 * return value from omap4_prminst_deassert_hardreset(). XXX This
2995 * function is scheduled for removal when the PRM code is moved into
2998 static int _omap4_deassert_hardreset(struct omap_hwmod
*oh
,
2999 struct omap_hwmod_rst_info
*ohri
)
3005 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
3006 oh
->name
, ohri
->name
);
3007 return omap4_prminst_deassert_hardreset(ohri
->rst_shift
,
3008 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3009 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3010 oh
->prcm
.omap4
.rstctrl_offs
);
3014 * _omap4_is_hardreset_asserted - call OMAP4 PRM hardreset fn with hwmod args
3015 * @oh: struct omap_hwmod * to test hardreset
3016 * @ohri: hardreset line data
3018 * Call omap4_prminst_is_hardreset_asserted() with parameters
3019 * extracted from the hwmod @oh and the hardreset line data @ohri.
3020 * Only intended for use as an soc_ops function pointer. Passes along
3021 * the return value from omap4_prminst_is_hardreset_asserted(). XXX
3022 * This function is scheduled for removal when the PRM code is moved
3025 static int _omap4_is_hardreset_asserted(struct omap_hwmod
*oh
,
3026 struct omap_hwmod_rst_info
*ohri
)
3031 return omap4_prminst_is_hardreset_asserted(ohri
->rst_shift
,
3032 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
3033 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3034 oh
->prcm
.omap4
.rstctrl_offs
);
3038 * _am33xx_assert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3039 * @oh: struct omap_hwmod * to assert hardreset
3040 * @ohri: hardreset line data
3042 * Call am33xx_prminst_assert_hardreset() with parameters extracted
3043 * from the hwmod @oh and the hardreset line data @ohri. Only
3044 * intended for use as an soc_ops function pointer. Passes along the
3045 * return value from am33xx_prminst_assert_hardreset(). XXX This
3046 * function is scheduled for removal when the PRM code is moved into
3049 static int _am33xx_assert_hardreset(struct omap_hwmod
*oh
,
3050 struct omap_hwmod_rst_info
*ohri
)
3053 return am33xx_prm_assert_hardreset(ohri
->rst_shift
,
3054 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3055 oh
->prcm
.omap4
.rstctrl_offs
);
3059 * _am33xx_deassert_hardreset - call AM33XX PRM hardreset fn with hwmod args
3060 * @oh: struct omap_hwmod * to deassert hardreset
3061 * @ohri: hardreset line data
3063 * Call am33xx_prminst_deassert_hardreset() with parameters extracted
3064 * from the hwmod @oh and the hardreset line data @ohri. Only
3065 * intended for use as an soc_ops function pointer. Passes along the
3066 * return value from am33xx_prminst_deassert_hardreset(). XXX This
3067 * function is scheduled for removal when the PRM code is moved into
3070 static int _am33xx_deassert_hardreset(struct omap_hwmod
*oh
,
3071 struct omap_hwmod_rst_info
*ohri
)
3073 return am33xx_prm_deassert_hardreset(ohri
->rst_shift
,
3075 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3076 oh
->prcm
.omap4
.rstctrl_offs
,
3077 oh
->prcm
.omap4
.rstst_offs
);
3081 * _am33xx_is_hardreset_asserted - call AM33XX PRM hardreset fn with hwmod args
3082 * @oh: struct omap_hwmod * to test hardreset
3083 * @ohri: hardreset line data
3085 * Call am33xx_prminst_is_hardreset_asserted() with parameters
3086 * extracted from the hwmod @oh and the hardreset line data @ohri.
3087 * Only intended for use as an soc_ops function pointer. Passes along
3088 * the return value from am33xx_prminst_is_hardreset_asserted(). XXX
3089 * This function is scheduled for removal when the PRM code is moved
3092 static int _am33xx_is_hardreset_asserted(struct omap_hwmod
*oh
,
3093 struct omap_hwmod_rst_info
*ohri
)
3095 return am33xx_prm_is_hardreset_asserted(ohri
->rst_shift
,
3096 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
3097 oh
->prcm
.omap4
.rstctrl_offs
);
3100 /* Public functions */
3102 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
3104 if (oh
->flags
& HWMOD_16BIT_REG
)
3105 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
3107 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
3110 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
3112 if (oh
->flags
& HWMOD_16BIT_REG
)
3113 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
3115 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
3119 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
3120 * @oh: struct omap_hwmod *
3122 * This is a public function exposed to drivers. Some drivers may need to do
3123 * some settings before and after resetting the device. Those drivers after
3124 * doing the necessary settings could use this function to start a reset by
3125 * setting the SYSCONFIG.SOFTRESET bit.
3127 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
3132 if (!oh
|| !(oh
->_sysc_cache
))
3135 v
= oh
->_sysc_cache
;
3136 ret
= _set_softreset(oh
, &v
);
3139 _write_sysconfig(v
, oh
);
3146 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
3147 * @oh: struct omap_hwmod *
3148 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
3150 * Sets the IP block's OCP slave idlemode in hardware, and updates our
3151 * local copy. Intended to be used by drivers that have some erratum
3152 * that requires direct manipulation of the SIDLEMODE bits. Returns
3153 * -EINVAL if @oh is null, or passes along the return value from
3154 * _set_slave_idlemode().
3156 * XXX Does this function have any current users? If not, we should
3157 * remove it; it is better to let the rest of the hwmod code handle this.
3158 * Any users of this function should be scrutinized carefully.
3160 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
3168 v
= oh
->_sysc_cache
;
3170 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
3172 _write_sysconfig(v
, oh
);
3178 * omap_hwmod_lookup - look up a registered omap_hwmod by name
3179 * @name: name of the omap_hwmod to look up
3181 * Given a @name of an omap_hwmod, return a pointer to the registered
3182 * struct omap_hwmod *, or NULL upon error.
3184 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
3186 struct omap_hwmod
*oh
;
3197 * omap_hwmod_for_each - call function for each registered omap_hwmod
3198 * @fn: pointer to a callback function
3199 * @data: void * data to pass to callback function
3201 * Call @fn for each registered omap_hwmod, passing @data to each
3202 * function. @fn must return 0 for success or any other value for
3203 * failure. If @fn returns non-zero, the iteration across omap_hwmods
3204 * will stop and the non-zero return value will be passed to the
3205 * caller of omap_hwmod_for_each(). @fn is called with
3206 * omap_hwmod_for_each() held.
3208 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
3211 struct omap_hwmod
*temp_oh
;
3217 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3218 ret
= (*fn
)(temp_oh
, data
);
3227 * omap_hwmod_register_links - register an array of hwmod links
3228 * @ois: pointer to an array of omap_hwmod_ocp_if to register
3230 * Intended to be called early in boot before the clock framework is
3231 * initialized. If @ois is not null, will register all omap_hwmods
3232 * listed in @ois that are valid for this chip. Returns -EINVAL if
3233 * omap_hwmod_init() hasn't been called before calling this function,
3234 * -ENOMEM if the link memory area can't be allocated, or 0 upon
3237 int __init
omap_hwmod_register_links(struct omap_hwmod_ocp_if
**ois
)
3248 if (_alloc_linkspace(ois
)) {
3249 pr_err("omap_hwmod: could not allocate link space\n");
3256 r
= _register_link(ois
[i
]);
3257 WARN(r
&& r
!= -EEXIST
,
3258 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
3259 ois
[i
]->master
->name
, ois
[i
]->slave
->name
, r
);
3266 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
3267 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
3269 * If the hwmod data corresponding to the MPU subsystem IP block
3270 * hasn't been initialized and set up yet, do so now. This must be
3271 * done first since sleep dependencies may be added from other hwmods
3272 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
3275 static void __init
_ensure_mpu_hwmod_is_setup(struct omap_hwmod
*oh
)
3277 if (!mpu_oh
|| mpu_oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3278 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
3279 __func__
, MPU_INITIATOR_NAME
);
3280 else if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
3281 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
3285 * omap_hwmod_setup_one - set up a single hwmod
3286 * @oh_name: const char * name of the already-registered hwmod to set up
3288 * Initialize and set up a single hwmod. Intended to be used for a
3289 * small number of early devices, such as the timer IP blocks used for
3290 * the scheduler clock. Must be called after omap2_clk_init().
3291 * Resolves the struct clk names to struct clk pointers for each
3292 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
3293 * -EINVAL upon error or 0 upon success.
3295 int __init
omap_hwmod_setup_one(const char *oh_name
)
3297 struct omap_hwmod
*oh
;
3299 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
3301 oh
= _lookup(oh_name
);
3303 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
3307 _ensure_mpu_hwmod_is_setup(oh
);
3316 * omap_hwmod_setup_all - set up all registered IP blocks
3318 * Initialize and set up all IP blocks registered with the hwmod code.
3319 * Must be called after omap2_clk_init(). Resolves the struct clk
3320 * names to struct clk pointers for each registered omap_hwmod. Also
3321 * calls _setup() on each hwmod. Returns 0 upon success.
3323 static int __init
omap_hwmod_setup_all(void)
3325 _ensure_mpu_hwmod_is_setup(NULL
);
3327 omap_hwmod_for_each(_init
, NULL
);
3328 omap_hwmod_for_each(_setup
, NULL
);
3332 omap_core_initcall(omap_hwmod_setup_all
);
3335 * omap_hwmod_enable - enable an omap_hwmod
3336 * @oh: struct omap_hwmod *
3338 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
3339 * Returns -EINVAL on error or passes along the return value from _enable().
3341 int omap_hwmod_enable(struct omap_hwmod
*oh
)
3344 unsigned long flags
;
3349 spin_lock_irqsave(&oh
->_lock
, flags
);
3351 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3357 * omap_hwmod_idle - idle an omap_hwmod
3358 * @oh: struct omap_hwmod *
3360 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
3361 * Returns -EINVAL on error or passes along the return value from _idle().
3363 int omap_hwmod_idle(struct omap_hwmod
*oh
)
3365 unsigned long flags
;
3370 spin_lock_irqsave(&oh
->_lock
, flags
);
3372 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3378 * omap_hwmod_shutdown - shutdown an omap_hwmod
3379 * @oh: struct omap_hwmod *
3381 * Shutdown an omap_hwmod @oh. Intended to be called by
3382 * omap_device_shutdown(). Returns -EINVAL on error or passes along
3383 * the return value from _shutdown().
3385 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
3387 unsigned long flags
;
3392 spin_lock_irqsave(&oh
->_lock
, flags
);
3394 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3400 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
3401 * @oh: struct omap_hwmod *oh
3403 * Intended to be called by the omap_device code.
3405 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
3407 unsigned long flags
;
3409 spin_lock_irqsave(&oh
->_lock
, flags
);
3411 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3417 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
3418 * @oh: struct omap_hwmod *oh
3420 * Intended to be called by the omap_device code.
3422 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
3424 unsigned long flags
;
3426 spin_lock_irqsave(&oh
->_lock
, flags
);
3427 _disable_clocks(oh
);
3428 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3434 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
3435 * @oh: struct omap_hwmod *oh
3437 * Intended to be called by drivers and core code when all posted
3438 * writes to a device must complete before continuing further
3439 * execution (for example, after clearing some device IRQSTATUS
3442 * XXX what about targets with multiple OCP threads?
3444 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
3448 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
3449 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
3455 * Forces posted writes to complete on the OCP thread handling
3458 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
3462 * omap_hwmod_reset - reset the hwmod
3463 * @oh: struct omap_hwmod *
3465 * Under some conditions, a driver may wish to reset the entire device.
3466 * Called from omap_device code. Returns -EINVAL on error or passes along
3467 * the return value from _reset().
3469 int omap_hwmod_reset(struct omap_hwmod
*oh
)
3472 unsigned long flags
;
3477 spin_lock_irqsave(&oh
->_lock
, flags
);
3479 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3485 * IP block data retrieval functions
3489 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
3490 * @oh: struct omap_hwmod *
3491 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
3493 * Count the number of struct resource array elements necessary to
3494 * contain omap_hwmod @oh resources. Intended to be called by code
3495 * that registers omap_devices. Intended to be used to determine the
3496 * size of a dynamically-allocated struct resource array, before
3497 * calling omap_hwmod_fill_resources(). Returns the number of struct
3498 * resource array elements needed.
3500 * XXX This code is not optimized. It could attempt to merge adjacent
3504 int omap_hwmod_count_resources(struct omap_hwmod
*oh
, unsigned long flags
)
3508 if (flags
& IORESOURCE_IRQ
)
3509 ret
+= _count_mpu_irqs(oh
);
3511 if (flags
& IORESOURCE_DMA
)
3512 ret
+= _count_sdma_reqs(oh
);
3514 if (flags
& IORESOURCE_MEM
) {
3516 struct omap_hwmod_ocp_if
*os
;
3517 struct list_head
*p
= oh
->slave_ports
.next
;
3519 while (i
< oh
->slaves_cnt
) {
3520 os
= _fetch_next_ocp_if(&p
, &i
);
3521 ret
+= _count_ocp_if_addr_spaces(os
);
3529 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
3530 * @oh: struct omap_hwmod *
3531 * @res: pointer to the first element of an array of struct resource to fill
3533 * Fill the struct resource array @res with resource data from the
3534 * omap_hwmod @oh. Intended to be called by code that registers
3535 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3536 * number of array elements filled.
3538 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3540 struct omap_hwmod_ocp_if
*os
;
3541 struct list_head
*p
;
3542 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
, addr_cnt
;
3545 /* For each IRQ, DMA, memory area, fill in array.*/
3547 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
3548 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
3549 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
3550 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
3551 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
3552 (res
+ r
)->flags
= IORESOURCE_IRQ
;
3556 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3557 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3558 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3559 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3560 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3561 (res
+ r
)->flags
= IORESOURCE_DMA
;
3565 p
= oh
->slave_ports
.next
;
3568 while (i
< oh
->slaves_cnt
) {
3569 os
= _fetch_next_ocp_if(&p
, &i
);
3570 addr_cnt
= _count_ocp_if_addr_spaces(os
);
3572 for (j
= 0; j
< addr_cnt
; j
++) {
3573 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
3574 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
3575 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
3576 (res
+ r
)->flags
= IORESOURCE_MEM
;
3585 * omap_hwmod_fill_dma_resources - fill struct resource array with dma data
3586 * @oh: struct omap_hwmod *
3587 * @res: pointer to the array of struct resource to fill
3589 * Fill the struct resource array @res with dma resource data from the
3590 * omap_hwmod @oh. Intended to be called by code that registers
3591 * omap_devices. See also omap_hwmod_count_resources(). Returns the
3592 * number of array elements filled.
3594 int omap_hwmod_fill_dma_resources(struct omap_hwmod
*oh
, struct resource
*res
)
3596 int i
, sdma_reqs_cnt
;
3599 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
3600 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
3601 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
3602 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
3603 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
3604 (res
+ r
)->flags
= IORESOURCE_DMA
;
3612 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
3613 * @oh: struct omap_hwmod * to operate on
3614 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
3615 * @name: pointer to the name of the data to fetch (optional)
3616 * @rsrc: pointer to a struct resource, allocated by the caller
3618 * Retrieve MPU IRQ, SDMA request line, or address space start/end
3619 * data for the IP block pointed to by @oh. The data will be filled
3620 * into a struct resource record pointed to by @rsrc. The struct
3621 * resource must be allocated by the caller. When @name is non-null,
3622 * the data associated with the matching entry in the IRQ/SDMA/address
3623 * space hwmod data arrays will be returned. If @name is null, the
3624 * first array entry will be returned. Data order is not meaningful
3625 * in hwmod data, so callers are strongly encouraged to use a non-null
3626 * @name whenever possible to avoid unpredictable effects if hwmod
3627 * data is later added that causes data ordering to change. This
3628 * function is only intended for use by OMAP core code. Device
3629 * drivers should not call this function - the appropriate bus-related
3630 * data accessor functions should be used instead. Returns 0 upon
3631 * success or a negative error code upon error.
3633 int omap_hwmod_get_resource_byname(struct omap_hwmod
*oh
, unsigned int type
,
3634 const char *name
, struct resource
*rsrc
)
3637 unsigned int irq
, dma
;
3638 u32 pa_start
, pa_end
;
3643 if (type
== IORESOURCE_IRQ
) {
3644 r
= _get_mpu_irq_by_name(oh
, name
, &irq
);
3650 } else if (type
== IORESOURCE_DMA
) {
3651 r
= _get_sdma_req_by_name(oh
, name
, &dma
);
3657 } else if (type
== IORESOURCE_MEM
) {
3658 r
= _get_addr_space_by_name(oh
, name
, &pa_start
, &pa_end
);
3662 rsrc
->start
= pa_start
;
3675 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
3676 * @oh: struct omap_hwmod *
3678 * Return the powerdomain pointer associated with the OMAP module
3679 * @oh's main clock. If @oh does not have a main clk, return the
3680 * powerdomain associated with the interface clock associated with the
3681 * module's MPU port. (XXX Perhaps this should use the SDMA port
3682 * instead?) Returns NULL on error, or a struct powerdomain * on
3685 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
3688 struct omap_hwmod_ocp_if
*oi
;
3689 struct clockdomain
*clkdm
;
3690 struct clk_hw_omap
*clk
;
3696 return oh
->clkdm
->pwrdm
.ptr
;
3701 oi
= _find_mpu_rt_port(oh
);
3707 clk
= to_clk_hw_omap(__clk_get_hw(c
));
3712 return clkdm
->pwrdm
.ptr
;
3716 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3717 * @oh: struct omap_hwmod *
3719 * Returns the virtual address corresponding to the beginning of the
3720 * module's register target, in the address range that is intended to
3721 * be used by the MPU. Returns the virtual address upon success or NULL
3724 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
3729 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
3732 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3735 return oh
->_mpu_rt_va
;
3739 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3740 * @oh: struct omap_hwmod *
3741 * @init_oh: struct omap_hwmod * (initiator)
3743 * Add a sleep dependency between the initiator @init_oh and @oh.
3744 * Intended to be called by DSP/Bridge code via platform_data for the
3745 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3746 * code needs to add/del initiator dependencies dynamically
3747 * before/after accessing a device. Returns the return value from
3748 * _add_initiator_dep().
3750 * XXX Keep a usecount in the clockdomain code
3752 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
3753 struct omap_hwmod
*init_oh
)
3755 return _add_initiator_dep(oh
, init_oh
);
3759 * XXX what about functions for drivers to save/restore ocp_sysconfig
3760 * for context save/restore operations?
3764 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3765 * @oh: struct omap_hwmod *
3766 * @init_oh: struct omap_hwmod * (initiator)
3768 * Remove a sleep dependency between the initiator @init_oh and @oh.
3769 * Intended to be called by DSP/Bridge code via platform_data for the
3770 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3771 * code needs to add/del initiator dependencies dynamically
3772 * before/after accessing a device. Returns the return value from
3773 * _del_initiator_dep().
3775 * XXX Keep a usecount in the clockdomain code
3777 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
3778 struct omap_hwmod
*init_oh
)
3780 return _del_initiator_dep(oh
, init_oh
);
3784 * omap_hwmod_enable_wakeup - allow device to wake up the system
3785 * @oh: struct omap_hwmod *
3787 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3788 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3789 * this IP block if it has dynamic mux entries. Eventually this
3790 * should set PRCM wakeup registers to cause the PRCM to receive
3791 * wakeup events from the module. Does not set any wakeup routing
3792 * registers beyond this point - if the module is to wake up any other
3793 * module or subsystem, that must be set separately. Called by
3794 * omap_device code. Returns -EINVAL on error or 0 upon success.
3796 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
3798 unsigned long flags
;
3801 spin_lock_irqsave(&oh
->_lock
, flags
);
3803 if (oh
->class->sysc
&&
3804 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3805 v
= oh
->_sysc_cache
;
3806 _enable_wakeup(oh
, &v
);
3807 _write_sysconfig(v
, oh
);
3810 _set_idle_ioring_wakeup(oh
, true);
3811 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3817 * omap_hwmod_disable_wakeup - prevent device from waking the system
3818 * @oh: struct omap_hwmod *
3820 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3821 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3822 * events for this IP block if it has dynamic mux entries. Eventually
3823 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3824 * wakeup events from the module. Does not set any wakeup routing
3825 * registers beyond this point - if the module is to wake up any other
3826 * module or subsystem, that must be set separately. Called by
3827 * omap_device code. Returns -EINVAL on error or 0 upon success.
3829 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
3831 unsigned long flags
;
3834 spin_lock_irqsave(&oh
->_lock
, flags
);
3836 if (oh
->class->sysc
&&
3837 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3838 v
= oh
->_sysc_cache
;
3839 _disable_wakeup(oh
, &v
);
3840 _write_sysconfig(v
, oh
);
3843 _set_idle_ioring_wakeup(oh
, false);
3844 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3850 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3851 * contained in the hwmod module.
3852 * @oh: struct omap_hwmod *
3853 * @name: name of the reset line to lookup and assert
3855 * Some IP like dsp, ipu or iva contain processor that require
3856 * an HW reset line to be assert / deassert in order to enable fully
3857 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3858 * yet supported on this OMAP; otherwise, passes along the return value
3859 * from _assert_hardreset().
3861 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3864 unsigned long flags
;
3869 spin_lock_irqsave(&oh
->_lock
, flags
);
3870 ret
= _assert_hardreset(oh
, name
);
3871 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3877 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3878 * contained in the hwmod module.
3879 * @oh: struct omap_hwmod *
3880 * @name: name of the reset line to look up and deassert
3882 * Some IP like dsp, ipu or iva contain processor that require
3883 * an HW reset line to be assert / deassert in order to enable fully
3884 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3885 * yet supported on this OMAP; otherwise, passes along the return value
3886 * from _deassert_hardreset().
3888 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3891 unsigned long flags
;
3896 spin_lock_irqsave(&oh
->_lock
, flags
);
3897 ret
= _deassert_hardreset(oh
, name
);
3898 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3904 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3905 * contained in the hwmod module
3906 * @oh: struct omap_hwmod *
3907 * @name: name of the reset line to look up and read
3909 * Return the current state of the hwmod @oh's reset line named @name:
3910 * returns -EINVAL upon parameter error or if this operation
3911 * is unsupported on the current OMAP; otherwise, passes along the return
3912 * value from _read_hardreset().
3914 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
3917 unsigned long flags
;
3922 spin_lock_irqsave(&oh
->_lock
, flags
);
3923 ret
= _read_hardreset(oh
, name
);
3924 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3931 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3932 * @classname: struct omap_hwmod_class name to search for
3933 * @fn: callback function pointer to call for each hwmod in class @classname
3934 * @user: arbitrary context data to pass to the callback function
3936 * For each omap_hwmod of class @classname, call @fn.
3937 * If the callback function returns something other than
3938 * zero, the iterator is terminated, and the callback function's return
3939 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3940 * if @classname or @fn are NULL, or passes back the error code from @fn.
3942 int omap_hwmod_for_each_by_class(const char *classname
,
3943 int (*fn
)(struct omap_hwmod
*oh
,
3947 struct omap_hwmod
*temp_oh
;
3950 if (!classname
|| !fn
)
3953 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3954 __func__
, classname
);
3956 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3957 if (!strcmp(temp_oh
->class->name
, classname
)) {
3958 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3959 __func__
, temp_oh
->name
);
3960 ret
= (*fn
)(temp_oh
, user
);
3967 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3974 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3975 * @oh: struct omap_hwmod *
3976 * @state: state that _setup() should leave the hwmod in
3978 * Sets the hwmod state that @oh will enter at the end of _setup()
3979 * (called by omap_hwmod_setup_*()). See also the documentation
3980 * for _setup_postsetup(), above. Returns 0 upon success or
3981 * -EINVAL if there is a problem with the arguments or if the hwmod is
3982 * in the wrong state.
3984 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
3987 unsigned long flags
;
3992 if (state
!= _HWMOD_STATE_DISABLED
&&
3993 state
!= _HWMOD_STATE_ENABLED
&&
3994 state
!= _HWMOD_STATE_IDLE
)
3997 spin_lock_irqsave(&oh
->_lock
, flags
);
3999 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
4004 oh
->_postsetup_state
= state
;
4008 spin_unlock_irqrestore(&oh
->_lock
, flags
);
4014 * omap_hwmod_get_context_loss_count - get lost context count
4015 * @oh: struct omap_hwmod *
4017 * Returns the context loss count of associated @oh
4018 * upon success, or zero if no context loss data is available.
4020 * On OMAP4, this queries the per-hwmod context loss register,
4021 * assuming one exists. If not, or on OMAP2/3, this queries the
4022 * enclosing powerdomain context loss count.
4024 int omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
4026 struct powerdomain
*pwrdm
;
4029 if (soc_ops
.get_context_lost
)
4030 return soc_ops
.get_context_lost(oh
);
4032 pwrdm
= omap_hwmod_get_pwrdm(oh
);
4034 ret
= pwrdm_get_context_loss_count(pwrdm
);
4040 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
4041 * @oh: struct omap_hwmod *
4043 * Prevent the hwmod @oh from being reset during the setup process.
4044 * Intended for use by board-*.c files on boards with devices that
4045 * cannot tolerate being reset. Must be called before the hwmod has
4046 * been set up. Returns 0 upon success or negative error code upon
4049 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
4054 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
4055 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
4060 oh
->flags
|= HWMOD_INIT_NO_RESET
;
4066 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
4067 * @oh: struct omap_hwmod * containing hwmod mux entries
4068 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
4069 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
4071 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
4072 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
4073 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
4074 * this function is not called for a given pad_idx, then the ISR
4075 * associated with @oh's first MPU IRQ will be triggered when an I/O
4076 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
4077 * the _dynamic or wakeup_ entry: if there are other entries not
4078 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
4079 * entries are NOT COUNTED in the dynamic pad index. This function
4080 * must be called separately for each pad that requires its interrupt
4081 * to be re-routed this way. Returns -EINVAL if there is an argument
4082 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
4083 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
4085 * XXX This function interface is fragile. Rather than using array
4086 * indexes, which are subject to unpredictable change, it should be
4087 * using hwmod IRQ names, and some other stable key for the hwmod mux
4090 int omap_hwmod_pad_route_irq(struct omap_hwmod
*oh
, int pad_idx
, int irq_idx
)
4096 if (!oh
|| !oh
->mux
|| !oh
->mpu_irqs
|| pad_idx
< 0 ||
4097 pad_idx
>= oh
->mux
->nr_pads_dynamic
)
4100 /* Check the number of available mpu_irqs */
4101 for (nr_irqs
= 0; oh
->mpu_irqs
[nr_irqs
].irq
>= 0; nr_irqs
++)
4104 if (irq_idx
>= nr_irqs
)
4107 if (!oh
->mux
->irqs
) {
4108 /* XXX What frees this? */
4109 oh
->mux
->irqs
= kzalloc(sizeof(int) * oh
->mux
->nr_pads_dynamic
,
4114 oh
->mux
->irqs
[pad_idx
] = irq_idx
;
4120 * omap_hwmod_init - initialize the hwmod code
4122 * Sets up some function pointers needed by the hwmod code to operate on the
4123 * currently-booted SoC. Intended to be called once during kernel init
4124 * before any hwmods are registered. No return value.
4126 void __init
omap_hwmod_init(void)
4128 if (cpu_is_omap24xx()) {
4129 soc_ops
.wait_target_ready
= _omap2xxx_wait_target_ready
;
4130 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
4131 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
4132 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
4133 } else if (cpu_is_omap34xx()) {
4134 soc_ops
.wait_target_ready
= _omap3xxx_wait_target_ready
;
4135 soc_ops
.assert_hardreset
= _omap2_assert_hardreset
;
4136 soc_ops
.deassert_hardreset
= _omap2_deassert_hardreset
;
4137 soc_ops
.is_hardreset_asserted
= _omap2_is_hardreset_asserted
;
4138 } else if (cpu_is_omap44xx() || soc_is_omap54xx()) {
4139 soc_ops
.enable_module
= _omap4_enable_module
;
4140 soc_ops
.disable_module
= _omap4_disable_module
;
4141 soc_ops
.wait_target_ready
= _omap4_wait_target_ready
;
4142 soc_ops
.assert_hardreset
= _omap4_assert_hardreset
;
4143 soc_ops
.deassert_hardreset
= _omap4_deassert_hardreset
;
4144 soc_ops
.is_hardreset_asserted
= _omap4_is_hardreset_asserted
;
4145 soc_ops
.init_clkdm
= _init_clkdm
;
4146 soc_ops
.update_context_lost
= _omap4_update_context_lost
;
4147 soc_ops
.get_context_lost
= _omap4_get_context_lost
;
4148 } else if (soc_is_am33xx()) {
4149 soc_ops
.enable_module
= _am33xx_enable_module
;
4150 soc_ops
.disable_module
= _am33xx_disable_module
;
4151 soc_ops
.wait_target_ready
= _am33xx_wait_target_ready
;
4152 soc_ops
.assert_hardreset
= _am33xx_assert_hardreset
;
4153 soc_ops
.deassert_hardreset
= _am33xx_deassert_hardreset
;
4154 soc_ops
.is_hardreset_asserted
= _am33xx_is_hardreset_asserted
;
4155 soc_ops
.init_clkdm
= _init_clkdm
;
4157 WARN(1, "omap_hwmod: unknown SoC type\n");
4164 * omap_hwmod_get_main_clk - get pointer to main clock name
4165 * @oh: struct omap_hwmod *
4167 * Returns the main clock name assocated with @oh upon success,
4168 * or NULL if @oh is NULL.
4170 const char *omap_hwmod_get_main_clk(struct omap_hwmod
*oh
)
4175 return oh
->main_clk
;