2 * omap_hwmod implementation for OMAP2/3/4
4 * Copyright (C) 2009-2011 Nokia Corporation
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
7 * Paul Walmsley, BenoƮt Cousson, Kevin Hilman
9 * Created in collaboration with (alphabetical order): Thara Gopinath,
10 * Tony Lindgren, Rajendra Nayak, Vikram Pandita, Sakari Poussa, Anand
11 * Sawant, Santosh Shilimkar, Richard Woodruff
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
19 * One way to view an OMAP SoC is as a collection of largely unrelated
20 * IP blocks connected by interconnects. The IP blocks include
21 * devices such as ARM processors, audio serial interfaces, UARTs,
22 * etc. Some of these devices, like the DSP, are created by TI;
23 * others, like the SGX, largely originate from external vendors. In
24 * TI's documentation, on-chip devices are referred to as "OMAP
25 * modules." Some of these IP blocks are identical across several
26 * OMAP versions. Others are revised frequently.
28 * These OMAP modules are tied together by various interconnects.
29 * Most of the address and data flow between modules is via OCP-based
30 * interconnects such as the L3 and L4 buses; but there are other
31 * interconnects that distribute the hardware clock tree, handle idle
32 * and reset signaling, supply power, and connect the modules to
33 * various pads or balls on the OMAP package.
35 * OMAP hwmod provides a consistent way to describe the on-chip
36 * hardware blocks and their integration into the rest of the chip.
37 * This description can be automatically generated from the TI
38 * hardware database. OMAP hwmod provides a standard, consistent API
39 * to reset, enable, idle, and disable these hardware blocks. And
40 * hwmod provides a way for other core code, such as the Linux device
41 * code or the OMAP power management and address space mapping code,
42 * to query the hardware database.
46 * Drivers won't call hwmod functions directly. That is done by the
47 * omap_device code, and in rare occasions, by custom integration code
48 * in arch/arm/ *omap*. The omap_device code includes functions to
49 * build a struct platform_device using omap_hwmod data, and that is
50 * currently how hwmod data is communicated to drivers and to the
51 * Linux driver model. Most drivers will call omap_hwmod functions only
52 * indirectly, via pm_runtime*() functions.
54 * From a layering perspective, here is where the OMAP hwmod code
55 * fits into the kernel software stack:
57 * +-------------------------------+
58 * | Device driver code |
59 * | (e.g., drivers/) |
60 * +-------------------------------+
61 * | Linux driver model |
62 * | (platform_device / |
63 * | platform_driver data/code) |
64 * +-------------------------------+
65 * | OMAP core-driver integration |
66 * |(arch/arm/mach-omap2/devices.c)|
67 * +-------------------------------+
68 * | omap_device code |
69 * | (../plat-omap/omap_device.c) |
70 * +-------------------------------+
71 * ----> | omap_hwmod code/data | <-----
72 * | (../mach-omap2/omap_hwmod*) |
73 * +-------------------------------+
74 * | OMAP clock/PRCM/register fns |
75 * | (__raw_{read,write}l, clk*) |
76 * +-------------------------------+
78 * Device drivers should not contain any OMAP-specific code or data in
79 * them. They should only contain code to operate the IP block that
80 * the driver is responsible for. This is because these IP blocks can
81 * also appear in other SoCs, either from TI (such as DaVinci) or from
82 * other manufacturers; and drivers should be reusable across other
85 * The OMAP hwmod code also will attempt to reset and idle all on-chip
86 * devices upon boot. The goal here is for the kernel to be
87 * completely self-reliant and independent from bootloaders. This is
88 * to ensure a repeatable configuration, both to ensure consistent
89 * runtime behavior, and to make it easier for others to reproduce
92 * OMAP module activity states
93 * ---------------------------
94 * The hwmod code considers modules to be in one of several activity
95 * states. IP blocks start out in an UNKNOWN state, then once they
96 * are registered via the hwmod code, proceed to the REGISTERED state.
97 * Once their clock names are resolved to clock pointers, the module
98 * enters the CLKS_INITED state; and finally, once the module has been
99 * reset and the integration registers programmed, the INITIALIZED state
100 * is entered. The hwmod code will then place the module into either
101 * the IDLE state to save power, or in the case of a critical system
102 * module, the ENABLED state.
104 * OMAP core integration code can then call omap_hwmod*() functions
105 * directly to move the module between the IDLE, ENABLED, and DISABLED
106 * states, as needed. This is done during both the PM idle loop, and
107 * in the OMAP core integration code's implementation of the PM runtime
112 * This is a partial list.
113 * - OMAP2420 Multimedia Processor Silicon Revision 2.1.1, 2.2 (SWPU064)
114 * - OMAP2430 Multimedia Device POP Silicon Revision 2.1 (SWPU090)
115 * - OMAP34xx Multimedia Device Silicon Revision 3.1 (SWPU108)
116 * - OMAP4430 Multimedia Device Silicon Revision 1.0 (SWPU140)
117 * - Open Core Protocol Specification 2.2
120 * - handle IO mapping
121 * - bus throughput & module latency measurement code
123 * XXX add tests at the beginning of each function to ensure the hwmod is
124 * in the appropriate state
125 * XXX error return values should be checked to ensure that they are
130 #include <linux/kernel.h>
131 #include <linux/errno.h>
132 #include <linux/io.h>
133 #include <linux/clk.h>
134 #include <linux/delay.h>
135 #include <linux/err.h>
136 #include <linux/list.h>
137 #include <linux/mutex.h>
138 #include <linux/spinlock.h>
139 #include <linux/slab.h>
140 #include <linux/bootmem.h>
143 #include <plat/cpu.h>
144 #include "clockdomain.h"
145 #include "powerdomain.h"
146 #include <plat/clock.h>
147 #include <plat/omap_hwmod.h>
148 #include <plat/prcm.h>
150 #include "cm2xxx_3xxx.h"
151 #include "cminst44xx.h"
152 #include "prm2xxx_3xxx.h"
154 #include "prminst44xx.h"
157 /* Maximum microseconds to wait for OMAP module to softreset */
158 #define MAX_MODULE_SOFTRESET_WAIT 10000
160 /* Name of the OMAP hwmod for the MPU */
161 #define MPU_INITIATOR_NAME "mpu"
164 * Number of struct omap_hwmod_link records per struct
165 * omap_hwmod_ocp_if record (master->slave and slave->master)
167 #define LINKS_PER_OCP_IF 2
170 * struct omap_hwmod_soc_ops - fn ptrs for some SoC-specific operations
171 * @enable_module: function to enable a module (via MODULEMODE)
172 * @disable_module: function to disable a module (via MODULEMODE)
174 * XXX Eventually this functionality will be hidden inside the PRM/CM
175 * device drivers. Until then, this should avoid huge blocks of cpu_is_*()
176 * conditionals in this code.
178 struct omap_hwmod_soc_ops
{
179 void (*enable_module
)(struct omap_hwmod
*oh
);
180 int (*disable_module
)(struct omap_hwmod
*oh
);
183 /* soc_ops: adapts the omap_hwmod code to the currently-booted SoC */
184 static struct omap_hwmod_soc_ops soc_ops
;
186 /* omap_hwmod_list contains all registered struct omap_hwmods */
187 static LIST_HEAD(omap_hwmod_list
);
189 /* mpu_oh: used to add/remove MPU initiator from sleepdep list */
190 static struct omap_hwmod
*mpu_oh
;
193 * linkspace: ptr to a buffer that struct omap_hwmod_link records are
194 * allocated from - used to reduce the number of small memory
195 * allocations, which has a significant impact on performance
197 static struct omap_hwmod_link
*linkspace
;
200 * free_ls, max_ls: array indexes into linkspace; representing the
201 * next free struct omap_hwmod_link index, and the maximum number of
202 * struct omap_hwmod_link records allocated (respectively)
204 static unsigned short free_ls
, max_ls
, ls_supp
;
206 /* inited: set to true once the hwmod code is initialized */
209 /* Private functions */
212 * _fetch_next_ocp_if - return the next OCP interface in a list
213 * @p: ptr to a ptr to the list_head inside the ocp_if to return
214 * @i: pointer to the index of the element pointed to by @p in the list
216 * Return a pointer to the struct omap_hwmod_ocp_if record
217 * containing the struct list_head pointed to by @p, and increment
218 * @p such that a future call to this routine will return the next
221 static struct omap_hwmod_ocp_if
*_fetch_next_ocp_if(struct list_head
**p
,
224 struct omap_hwmod_ocp_if
*oi
;
226 oi
= list_entry(*p
, struct omap_hwmod_link
, node
)->ocp_if
;
235 * _update_sysc_cache - return the module OCP_SYSCONFIG register, keep copy
236 * @oh: struct omap_hwmod *
238 * Load the current value of the hwmod OCP_SYSCONFIG register into the
239 * struct omap_hwmod for later use. Returns -EINVAL if the hwmod has no
240 * OCP_SYSCONFIG register or 0 upon success.
242 static int _update_sysc_cache(struct omap_hwmod
*oh
)
244 if (!oh
->class->sysc
) {
245 WARN(1, "omap_hwmod: %s: cannot read OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
249 /* XXX ensure module interface clock is up */
251 oh
->_sysc_cache
= omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
253 if (!(oh
->class->sysc
->sysc_flags
& SYSC_NO_CACHE
))
254 oh
->_int_flags
|= _HWMOD_SYSCONFIG_LOADED
;
260 * _write_sysconfig - write a value to the module's OCP_SYSCONFIG register
261 * @v: OCP_SYSCONFIG value to write
262 * @oh: struct omap_hwmod *
264 * Write @v into the module class' OCP_SYSCONFIG register, if it has
265 * one. No return value.
267 static void _write_sysconfig(u32 v
, struct omap_hwmod
*oh
)
269 if (!oh
->class->sysc
) {
270 WARN(1, "omap_hwmod: %s: cannot write OCP_SYSCONFIG: not defined on hwmod's class\n", oh
->name
);
274 /* XXX ensure module interface clock is up */
276 /* Module might have lost context, always update cache and register */
278 omap_hwmod_write(v
, oh
, oh
->class->sysc
->sysc_offs
);
282 * _set_master_standbymode: set the OCP_SYSCONFIG MIDLEMODE field in @v
283 * @oh: struct omap_hwmod *
284 * @standbymode: MIDLEMODE field bits
285 * @v: pointer to register contents to modify
287 * Update the master standby mode bits in @v to be @standbymode for
288 * the @oh hwmod. Does not write to the hardware. Returns -EINVAL
289 * upon error or 0 upon success.
291 static int _set_master_standbymode(struct omap_hwmod
*oh
, u8 standbymode
,
297 if (!oh
->class->sysc
||
298 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_MIDLEMODE
))
301 if (!oh
->class->sysc
->sysc_fields
) {
302 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
306 mstandby_shift
= oh
->class->sysc
->sysc_fields
->midle_shift
;
307 mstandby_mask
= (0x3 << mstandby_shift
);
309 *v
&= ~mstandby_mask
;
310 *v
|= __ffs(standbymode
) << mstandby_shift
;
316 * _set_slave_idlemode: set the OCP_SYSCONFIG SIDLEMODE field in @v
317 * @oh: struct omap_hwmod *
318 * @idlemode: SIDLEMODE field bits
319 * @v: pointer to register contents to modify
321 * Update the slave idle mode bits in @v to be @idlemode for the @oh
322 * hwmod. Does not write to the hardware. Returns -EINVAL upon error
325 static int _set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
, u32
*v
)
330 if (!oh
->class->sysc
||
331 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SIDLEMODE
))
334 if (!oh
->class->sysc
->sysc_fields
) {
335 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
339 sidle_shift
= oh
->class->sysc
->sysc_fields
->sidle_shift
;
340 sidle_mask
= (0x3 << sidle_shift
);
343 *v
|= __ffs(idlemode
) << sidle_shift
;
349 * _set_clockactivity: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
350 * @oh: struct omap_hwmod *
351 * @clockact: CLOCKACTIVITY field bits
352 * @v: pointer to register contents to modify
354 * Update the clockactivity mode bits in @v to be @clockact for the
355 * @oh hwmod. Used for additional powersaving on some modules. Does
356 * not write to the hardware. Returns -EINVAL upon error or 0 upon
359 static int _set_clockactivity(struct omap_hwmod
*oh
, u8 clockact
, u32
*v
)
364 if (!oh
->class->sysc
||
365 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_CLOCKACTIVITY
))
368 if (!oh
->class->sysc
->sysc_fields
) {
369 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
373 clkact_shift
= oh
->class->sysc
->sysc_fields
->clkact_shift
;
374 clkact_mask
= (0x3 << clkact_shift
);
377 *v
|= clockact
<< clkact_shift
;
383 * _set_softreset: set OCP_SYSCONFIG.CLOCKACTIVITY bits in @v
384 * @oh: struct omap_hwmod *
385 * @v: pointer to register contents to modify
387 * Set the SOFTRESET bit in @v for hwmod @oh. Returns -EINVAL upon
388 * error or 0 upon success.
390 static int _set_softreset(struct omap_hwmod
*oh
, u32
*v
)
394 if (!oh
->class->sysc
||
395 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
398 if (!oh
->class->sysc
->sysc_fields
) {
399 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
403 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
411 * _set_module_autoidle: set the OCP_SYSCONFIG AUTOIDLE field in @v
412 * @oh: struct omap_hwmod *
413 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
414 * @v: pointer to register contents to modify
416 * Update the module autoidle bit in @v to be @autoidle for the @oh
417 * hwmod. The autoidle bit controls whether the module can gate
418 * internal clocks automatically when it isn't doing anything; the
419 * exact function of this bit varies on a per-module basis. This
420 * function does not write to the hardware. Returns -EINVAL upon
421 * error or 0 upon success.
423 static int _set_module_autoidle(struct omap_hwmod
*oh
, u8 autoidle
,
429 if (!oh
->class->sysc
||
430 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_AUTOIDLE
))
433 if (!oh
->class->sysc
->sysc_fields
) {
434 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
438 autoidle_shift
= oh
->class->sysc
->sysc_fields
->autoidle_shift
;
439 autoidle_mask
= (0x1 << autoidle_shift
);
441 *v
&= ~autoidle_mask
;
442 *v
|= autoidle
<< autoidle_shift
;
448 * _set_idle_ioring_wakeup - enable/disable IO pad wakeup on hwmod idle for mux
449 * @oh: struct omap_hwmod *
450 * @set_wake: bool value indicating to set (true) or clear (false) wakeup enable
452 * Set or clear the I/O pad wakeup flag in the mux entries for the
453 * hwmod @oh. This function changes the @oh->mux->pads_dynamic array
454 * in memory. If the hwmod is currently idled, and the new idle
455 * values don't match the previous ones, this function will also
456 * update the SCM PADCTRL registers. Otherwise, if the hwmod is not
457 * currently idled, this function won't touch the hardware: the new
458 * mux settings are written to the SCM PADCTRL registers when the
459 * hwmod is idled. No return value.
461 static void _set_idle_ioring_wakeup(struct omap_hwmod
*oh
, bool set_wake
)
463 struct omap_device_pad
*pad
;
468 if (!oh
->mux
|| !oh
->mux
->enabled
)
471 for (j
= 0; j
< oh
->mux
->nr_pads_dynamic
; j
++) {
472 pad
= oh
->mux
->pads_dynamic
[j
];
474 if (!(pad
->flags
& OMAP_DEVICE_PAD_WAKEUP
))
477 prev_idle
= pad
->idle
;
480 pad
->idle
|= OMAP_WAKEUP_EN
;
482 pad
->idle
&= ~OMAP_WAKEUP_EN
;
484 if (prev_idle
!= pad
->idle
)
488 if (change
&& oh
->_state
== _HWMOD_STATE_IDLE
)
489 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
493 * _enable_wakeup: set OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
494 * @oh: struct omap_hwmod *
496 * Allow the hardware module @oh to send wakeups. Returns -EINVAL
497 * upon error or 0 upon success.
499 static int _enable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
501 if (!oh
->class->sysc
||
502 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
503 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
504 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
507 if (!oh
->class->sysc
->sysc_fields
) {
508 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
512 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
513 *v
|= 0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
;
515 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
516 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
517 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
518 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
520 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
522 oh
->_int_flags
|= _HWMOD_WAKEUP_ENABLED
;
528 * _disable_wakeup: clear OCP_SYSCONFIG.ENAWAKEUP bit in the hardware
529 * @oh: struct omap_hwmod *
531 * Prevent the hardware module @oh to send wakeups. Returns -EINVAL
532 * upon error or 0 upon success.
534 static int _disable_wakeup(struct omap_hwmod
*oh
, u32
*v
)
536 if (!oh
->class->sysc
||
537 !((oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
) ||
538 (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
) ||
539 (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)))
542 if (!oh
->class->sysc
->sysc_fields
) {
543 WARN(1, "omap_hwmod: %s: offset struct for sysconfig not provided in class\n", oh
->name
);
547 if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)
548 *v
&= ~(0x1 << oh
->class->sysc
->sysc_fields
->enwkup_shift
);
550 if (oh
->class->sysc
->idlemodes
& SIDLE_SMART_WKUP
)
551 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_SMART
, v
);
552 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
553 _set_master_standbymode(oh
, HWMOD_IDLEMODE_SMART_WKUP
, v
);
555 /* XXX test pwrdm_get_wken for this hwmod's subsystem */
557 oh
->_int_flags
&= ~_HWMOD_WAKEUP_ENABLED
;
563 * _add_initiator_dep: prevent @oh from smart-idling while @init_oh is active
564 * @oh: struct omap_hwmod *
566 * Prevent the hardware module @oh from entering idle while the
567 * hardare module initiator @init_oh is active. Useful when a module
568 * will be accessed by a particular initiator (e.g., if a module will
569 * be accessed by the IVA, there should be a sleepdep between the IVA
570 * initiator and the module). Only applies to modules in smart-idle
571 * mode. If the clockdomain is marked as not needing autodeps, return
572 * 0 without doing anything. Otherwise, returns -EINVAL upon error or
573 * passes along clkdm_add_sleepdep() value upon success.
575 static int _add_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
580 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
583 return clkdm_add_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
587 * _del_initiator_dep: allow @oh to smart-idle even if @init_oh is active
588 * @oh: struct omap_hwmod *
590 * Allow the hardware module @oh to enter idle while the hardare
591 * module initiator @init_oh is active. Useful when a module will not
592 * be accessed by a particular initiator (e.g., if a module will not
593 * be accessed by the IVA, there should be no sleepdep between the IVA
594 * initiator and the module). Only applies to modules in smart-idle
595 * mode. If the clockdomain is marked as not needing autodeps, return
596 * 0 without doing anything. Returns -EINVAL upon error or passes
597 * along clkdm_del_sleepdep() value upon success.
599 static int _del_initiator_dep(struct omap_hwmod
*oh
, struct omap_hwmod
*init_oh
)
604 if (oh
->_clk
->clkdm
&& oh
->_clk
->clkdm
->flags
& CLKDM_NO_AUTODEPS
)
607 return clkdm_del_sleepdep(oh
->_clk
->clkdm
, init_oh
->_clk
->clkdm
);
611 * _init_main_clk - get a struct clk * for the the hwmod's main functional clk
612 * @oh: struct omap_hwmod *
614 * Called from _init_clocks(). Populates the @oh _clk (main
615 * functional clock pointer) if a main_clk is present. Returns 0 on
616 * success or -EINVAL on error.
618 static int _init_main_clk(struct omap_hwmod
*oh
)
625 oh
->_clk
= omap_clk_get_by_name(oh
->main_clk
);
627 pr_warning("omap_hwmod: %s: cannot clk_get main_clk %s\n",
628 oh
->name
, oh
->main_clk
);
632 if (!oh
->_clk
->clkdm
)
633 pr_warning("omap_hwmod: %s: missing clockdomain for %s.\n",
634 oh
->main_clk
, oh
->_clk
->name
);
640 * _init_interface_clks - get a struct clk * for the the hwmod's interface clks
641 * @oh: struct omap_hwmod *
643 * Called from _init_clocks(). Populates the @oh OCP slave interface
644 * clock pointers. Returns 0 on success or -EINVAL on error.
646 static int _init_interface_clks(struct omap_hwmod
*oh
)
648 struct omap_hwmod_ocp_if
*os
;
654 p
= oh
->slave_ports
.next
;
656 while (i
< oh
->slaves_cnt
) {
657 os
= _fetch_next_ocp_if(&p
, &i
);
661 c
= omap_clk_get_by_name(os
->clk
);
663 pr_warning("omap_hwmod: %s: cannot clk_get interface_clk %s\n",
674 * _init_opt_clk - get a struct clk * for the the hwmod's optional clocks
675 * @oh: struct omap_hwmod *
677 * Called from _init_clocks(). Populates the @oh omap_hwmod_opt_clk
678 * clock pointers. Returns 0 on success or -EINVAL on error.
680 static int _init_opt_clks(struct omap_hwmod
*oh
)
682 struct omap_hwmod_opt_clk
*oc
;
687 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++) {
688 c
= omap_clk_get_by_name(oc
->clk
);
690 pr_warning("omap_hwmod: %s: cannot clk_get opt_clk %s\n",
701 * _enable_clocks - enable hwmod main clock and interface clocks
702 * @oh: struct omap_hwmod *
704 * Enables all clocks necessary for register reads and writes to succeed
705 * on the hwmod @oh. Returns 0.
707 static int _enable_clocks(struct omap_hwmod
*oh
)
709 struct omap_hwmod_ocp_if
*os
;
713 pr_debug("omap_hwmod: %s: enabling clocks\n", oh
->name
);
716 clk_enable(oh
->_clk
);
718 p
= oh
->slave_ports
.next
;
720 while (i
< oh
->slaves_cnt
) {
721 os
= _fetch_next_ocp_if(&p
, &i
);
723 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
724 clk_enable(os
->_clk
);
727 /* The opt clocks are controlled by the device driver. */
733 * _disable_clocks - disable hwmod main clock and interface clocks
734 * @oh: struct omap_hwmod *
736 * Disables the hwmod @oh main functional and interface clocks. Returns 0.
738 static int _disable_clocks(struct omap_hwmod
*oh
)
740 struct omap_hwmod_ocp_if
*os
;
744 pr_debug("omap_hwmod: %s: disabling clocks\n", oh
->name
);
747 clk_disable(oh
->_clk
);
749 p
= oh
->slave_ports
.next
;
751 while (i
< oh
->slaves_cnt
) {
752 os
= _fetch_next_ocp_if(&p
, &i
);
754 if (os
->_clk
&& (os
->flags
& OCPIF_SWSUP_IDLE
))
755 clk_disable(os
->_clk
);
758 /* The opt clocks are controlled by the device driver. */
763 static void _enable_optional_clocks(struct omap_hwmod
*oh
)
765 struct omap_hwmod_opt_clk
*oc
;
768 pr_debug("omap_hwmod: %s: enabling optional clocks\n", oh
->name
);
770 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
772 pr_debug("omap_hwmod: enable %s:%s\n", oc
->role
,
774 clk_enable(oc
->_clk
);
778 static void _disable_optional_clocks(struct omap_hwmod
*oh
)
780 struct omap_hwmod_opt_clk
*oc
;
783 pr_debug("omap_hwmod: %s: disabling optional clocks\n", oh
->name
);
785 for (i
= oh
->opt_clks_cnt
, oc
= oh
->opt_clks
; i
> 0; i
--, oc
++)
787 pr_debug("omap_hwmod: disable %s:%s\n", oc
->role
,
789 clk_disable(oc
->_clk
);
794 * _omap4_enable_module - enable CLKCTRL modulemode on OMAP4
795 * @oh: struct omap_hwmod *
797 * Enables the PRCM module mode related to the hwmod @oh.
800 static void _omap4_enable_module(struct omap_hwmod
*oh
)
802 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
805 pr_debug("omap_hwmod: %s: %s: %d\n",
806 oh
->name
, __func__
, oh
->prcm
.omap4
.modulemode
);
808 omap4_cminst_module_enable(oh
->prcm
.omap4
.modulemode
,
809 oh
->clkdm
->prcm_partition
,
811 oh
->clkdm
->clkdm_offs
,
812 oh
->prcm
.omap4
.clkctrl_offs
);
816 * _omap4_wait_target_disable - wait for a module to be disabled on OMAP4
817 * @oh: struct omap_hwmod *
819 * Wait for a module @oh to enter slave idle. Returns 0 if the module
820 * does not have an IDLEST bit or if the module successfully enters
821 * slave idle; otherwise, pass along the return value of the
822 * appropriate *_cm*_wait_module_idle() function.
824 static int _omap4_wait_target_disable(struct omap_hwmod
*oh
)
826 if (!cpu_is_omap44xx())
832 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
835 if (oh
->flags
& HWMOD_NO_IDLEST
)
838 return omap4_cminst_wait_module_idle(oh
->clkdm
->prcm_partition
,
840 oh
->clkdm
->clkdm_offs
,
841 oh
->prcm
.omap4
.clkctrl_offs
);
845 * _count_mpu_irqs - count the number of MPU IRQ lines associated with @oh
846 * @oh: struct omap_hwmod *oh
848 * Count and return the number of MPU IRQs associated with the hwmod
849 * @oh. Used to allocate struct resource data. Returns 0 if @oh is
852 static int _count_mpu_irqs(struct omap_hwmod
*oh
)
854 struct omap_hwmod_irq_info
*ohii
;
857 if (!oh
|| !oh
->mpu_irqs
)
861 ohii
= &oh
->mpu_irqs
[i
++];
862 } while (ohii
->irq
!= -1);
868 * _count_sdma_reqs - count the number of SDMA request lines associated with @oh
869 * @oh: struct omap_hwmod *oh
871 * Count and return the number of SDMA request lines associated with
872 * the hwmod @oh. Used to allocate struct resource data. Returns 0
875 static int _count_sdma_reqs(struct omap_hwmod
*oh
)
877 struct omap_hwmod_dma_info
*ohdi
;
880 if (!oh
|| !oh
->sdma_reqs
)
884 ohdi
= &oh
->sdma_reqs
[i
++];
885 } while (ohdi
->dma_req
!= -1);
891 * _count_ocp_if_addr_spaces - count the number of address space entries for @oh
892 * @oh: struct omap_hwmod *oh
894 * Count and return the number of address space ranges associated with
895 * the hwmod @oh. Used to allocate struct resource data. Returns 0
898 static int _count_ocp_if_addr_spaces(struct omap_hwmod_ocp_if
*os
)
900 struct omap_hwmod_addr_space
*mem
;
903 if (!os
|| !os
->addr
)
907 mem
= &os
->addr
[i
++];
908 } while (mem
->pa_start
!= mem
->pa_end
);
914 * _get_mpu_irq_by_name - fetch MPU interrupt line number by name
915 * @oh: struct omap_hwmod * to operate on
916 * @name: pointer to the name of the MPU interrupt number to fetch (optional)
917 * @irq: pointer to an unsigned int to store the MPU IRQ number to
919 * Retrieve a MPU hardware IRQ line number named by @name associated
920 * with the IP block pointed to by @oh. The IRQ number will be filled
921 * into the address pointed to by @dma. When @name is non-null, the
922 * IRQ line number associated with the named entry will be returned.
923 * If @name is null, the first matching entry will be returned. Data
924 * order is not meaningful in hwmod data, so callers are strongly
925 * encouraged to use a non-null @name whenever possible to avoid
926 * unpredictable effects if hwmod data is later added that causes data
927 * ordering to change. Returns 0 upon success or a negative error
930 static int _get_mpu_irq_by_name(struct omap_hwmod
*oh
, const char *name
,
940 while (oh
->mpu_irqs
[i
].irq
!= -1) {
941 if (name
== oh
->mpu_irqs
[i
].name
||
942 !strcmp(name
, oh
->mpu_irqs
[i
].name
)) {
952 *irq
= oh
->mpu_irqs
[i
].irq
;
958 * _get_sdma_req_by_name - fetch SDMA request line ID by name
959 * @oh: struct omap_hwmod * to operate on
960 * @name: pointer to the name of the SDMA request line to fetch (optional)
961 * @dma: pointer to an unsigned int to store the request line ID to
963 * Retrieve an SDMA request line ID named by @name on the IP block
964 * pointed to by @oh. The ID will be filled into the address pointed
965 * to by @dma. When @name is non-null, the request line ID associated
966 * with the named entry will be returned. If @name is null, the first
967 * matching entry will be returned. Data order is not meaningful in
968 * hwmod data, so callers are strongly encouraged to use a non-null
969 * @name whenever possible to avoid unpredictable effects if hwmod
970 * data is later added that causes data ordering to change. Returns 0
971 * upon success or a negative error code upon error.
973 static int _get_sdma_req_by_name(struct omap_hwmod
*oh
, const char *name
,
983 while (oh
->sdma_reqs
[i
].dma_req
!= -1) {
984 if (name
== oh
->sdma_reqs
[i
].name
||
985 !strcmp(name
, oh
->sdma_reqs
[i
].name
)) {
995 *dma
= oh
->sdma_reqs
[i
].dma_req
;
1001 * _get_addr_space_by_name - fetch address space start & end by name
1002 * @oh: struct omap_hwmod * to operate on
1003 * @name: pointer to the name of the address space to fetch (optional)
1004 * @pa_start: pointer to a u32 to store the starting address to
1005 * @pa_end: pointer to a u32 to store the ending address to
1007 * Retrieve address space start and end addresses for the IP block
1008 * pointed to by @oh. The data will be filled into the addresses
1009 * pointed to by @pa_start and @pa_end. When @name is non-null, the
1010 * address space data associated with the named entry will be
1011 * returned. If @name is null, the first matching entry will be
1012 * returned. Data order is not meaningful in hwmod data, so callers
1013 * are strongly encouraged to use a non-null @name whenever possible
1014 * to avoid unpredictable effects if hwmod data is later added that
1015 * causes data ordering to change. Returns 0 upon success or a
1016 * negative error code upon error.
1018 static int _get_addr_space_by_name(struct omap_hwmod
*oh
, const char *name
,
1019 u32
*pa_start
, u32
*pa_end
)
1022 struct omap_hwmod_ocp_if
*os
;
1023 struct list_head
*p
= NULL
;
1026 p
= oh
->slave_ports
.next
;
1029 while (i
< oh
->slaves_cnt
) {
1030 os
= _fetch_next_ocp_if(&p
, &i
);
1036 while (os
->addr
[j
].pa_start
!= os
->addr
[j
].pa_end
) {
1037 if (name
== os
->addr
[j
].name
||
1038 !strcmp(name
, os
->addr
[j
].name
)) {
1052 *pa_start
= os
->addr
[j
].pa_start
;
1053 *pa_end
= os
->addr
[j
].pa_end
;
1059 * _save_mpu_port_index - find and save the index to @oh's MPU port
1060 * @oh: struct omap_hwmod *
1062 * Determines the array index of the OCP slave port that the MPU uses
1063 * to address the device, and saves it into the struct omap_hwmod.
1064 * Intended to be called during hwmod registration only. No return
1067 static void __init
_save_mpu_port_index(struct omap_hwmod
*oh
)
1069 struct omap_hwmod_ocp_if
*os
= NULL
;
1070 struct list_head
*p
;
1076 oh
->_int_flags
|= _HWMOD_NO_MPU_PORT
;
1078 p
= oh
->slave_ports
.next
;
1080 while (i
< oh
->slaves_cnt
) {
1081 os
= _fetch_next_ocp_if(&p
, &i
);
1082 if (os
->user
& OCP_USER_MPU
) {
1084 oh
->_int_flags
&= ~_HWMOD_NO_MPU_PORT
;
1093 * _find_mpu_rt_port - return omap_hwmod_ocp_if accessible by the MPU
1094 * @oh: struct omap_hwmod *
1096 * Given a pointer to a struct omap_hwmod record @oh, return a pointer
1097 * to the struct omap_hwmod_ocp_if record that is used by the MPU to
1098 * communicate with the IP block. This interface need not be directly
1099 * connected to the MPU (and almost certainly is not), but is directly
1100 * connected to the IP block represented by @oh. Returns a pointer
1101 * to the struct omap_hwmod_ocp_if * upon success, or returns NULL upon
1102 * error or if there does not appear to be a path from the MPU to this
1105 static struct omap_hwmod_ocp_if
*_find_mpu_rt_port(struct omap_hwmod
*oh
)
1107 if (!oh
|| oh
->_int_flags
& _HWMOD_NO_MPU_PORT
|| oh
->slaves_cnt
== 0)
1110 return oh
->_mpu_port
;
1114 * _find_mpu_rt_addr_space - return MPU register target address space for @oh
1115 * @oh: struct omap_hwmod *
1117 * Returns a pointer to the struct omap_hwmod_addr_space record representing
1118 * the register target MPU address space; or returns NULL upon error.
1120 static struct omap_hwmod_addr_space
* __init
_find_mpu_rt_addr_space(struct omap_hwmod
*oh
)
1122 struct omap_hwmod_ocp_if
*os
;
1123 struct omap_hwmod_addr_space
*mem
;
1124 int found
= 0, i
= 0;
1126 os
= _find_mpu_rt_port(oh
);
1127 if (!os
|| !os
->addr
)
1131 mem
= &os
->addr
[i
++];
1132 if (mem
->flags
& ADDR_TYPE_RT
)
1134 } while (!found
&& mem
->pa_start
!= mem
->pa_end
);
1136 return (found
) ? mem
: NULL
;
1140 * _enable_sysc - try to bring a module out of idle via OCP_SYSCONFIG
1141 * @oh: struct omap_hwmod *
1143 * If module is marked as SWSUP_SIDLE, force the module out of slave
1144 * idle; otherwise, configure it for smart-idle. If module is marked
1145 * as SWSUP_MSUSPEND, force the module out of master standby;
1146 * otherwise, configure it for smart-standby. No return value.
1148 static void _enable_sysc(struct omap_hwmod
*oh
)
1153 if (!oh
->class->sysc
)
1156 v
= oh
->_sysc_cache
;
1157 sf
= oh
->class->sysc
->sysc_flags
;
1159 if (sf
& SYSC_HAS_SIDLEMODE
) {
1160 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
1161 HWMOD_IDLEMODE_NO
: HWMOD_IDLEMODE_SMART
;
1162 _set_slave_idlemode(oh
, idlemode
, &v
);
1165 if (sf
& SYSC_HAS_MIDLEMODE
) {
1166 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1167 idlemode
= HWMOD_IDLEMODE_NO
;
1169 if (sf
& SYSC_HAS_ENAWAKEUP
)
1170 _enable_wakeup(oh
, &v
);
1171 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1172 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1174 idlemode
= HWMOD_IDLEMODE_SMART
;
1176 _set_master_standbymode(oh
, idlemode
, &v
);
1180 * XXX The clock framework should handle this, by
1181 * calling into this code. But this must wait until the
1182 * clock structures are tagged with omap_hwmod entries
1184 if ((oh
->flags
& HWMOD_SET_DEFAULT_CLOCKACT
) &&
1185 (sf
& SYSC_HAS_CLOCKACTIVITY
))
1186 _set_clockactivity(oh
, oh
->class->sysc
->clockact
, &v
);
1188 /* If slave is in SMARTIDLE, also enable wakeup */
1189 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1190 _enable_wakeup(oh
, &v
);
1192 _write_sysconfig(v
, oh
);
1195 * Set the autoidle bit only after setting the smartidle bit
1196 * Setting this will not have any impact on the other modules.
1198 if (sf
& SYSC_HAS_AUTOIDLE
) {
1199 idlemode
= (oh
->flags
& HWMOD_NO_OCP_AUTOIDLE
) ?
1201 _set_module_autoidle(oh
, idlemode
, &v
);
1202 _write_sysconfig(v
, oh
);
1207 * _idle_sysc - try to put a module into idle via OCP_SYSCONFIG
1208 * @oh: struct omap_hwmod *
1210 * If module is marked as SWSUP_SIDLE, force the module into slave
1211 * idle; otherwise, configure it for smart-idle. If module is marked
1212 * as SWSUP_MSUSPEND, force the module into master standby; otherwise,
1213 * configure it for smart-standby. No return value.
1215 static void _idle_sysc(struct omap_hwmod
*oh
)
1220 if (!oh
->class->sysc
)
1223 v
= oh
->_sysc_cache
;
1224 sf
= oh
->class->sysc
->sysc_flags
;
1226 if (sf
& SYSC_HAS_SIDLEMODE
) {
1227 idlemode
= (oh
->flags
& HWMOD_SWSUP_SIDLE
) ?
1228 HWMOD_IDLEMODE_FORCE
: HWMOD_IDLEMODE_SMART
;
1229 _set_slave_idlemode(oh
, idlemode
, &v
);
1232 if (sf
& SYSC_HAS_MIDLEMODE
) {
1233 if (oh
->flags
& HWMOD_SWSUP_MSTANDBY
) {
1234 idlemode
= HWMOD_IDLEMODE_FORCE
;
1236 if (sf
& SYSC_HAS_ENAWAKEUP
)
1237 _enable_wakeup(oh
, &v
);
1238 if (oh
->class->sysc
->idlemodes
& MSTANDBY_SMART_WKUP
)
1239 idlemode
= HWMOD_IDLEMODE_SMART_WKUP
;
1241 idlemode
= HWMOD_IDLEMODE_SMART
;
1243 _set_master_standbymode(oh
, idlemode
, &v
);
1246 /* If slave is in SMARTIDLE, also enable wakeup */
1247 if ((sf
& SYSC_HAS_SIDLEMODE
) && !(oh
->flags
& HWMOD_SWSUP_SIDLE
))
1248 _enable_wakeup(oh
, &v
);
1250 _write_sysconfig(v
, oh
);
1254 * _shutdown_sysc - force a module into idle via OCP_SYSCONFIG
1255 * @oh: struct omap_hwmod *
1257 * Force the module into slave idle and master suspend. No return
1260 static void _shutdown_sysc(struct omap_hwmod
*oh
)
1265 if (!oh
->class->sysc
)
1268 v
= oh
->_sysc_cache
;
1269 sf
= oh
->class->sysc
->sysc_flags
;
1271 if (sf
& SYSC_HAS_SIDLEMODE
)
1272 _set_slave_idlemode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1274 if (sf
& SYSC_HAS_MIDLEMODE
)
1275 _set_master_standbymode(oh
, HWMOD_IDLEMODE_FORCE
, &v
);
1277 if (sf
& SYSC_HAS_AUTOIDLE
)
1278 _set_module_autoidle(oh
, 1, &v
);
1280 _write_sysconfig(v
, oh
);
1284 * _lookup - find an omap_hwmod by name
1285 * @name: find an omap_hwmod by name
1287 * Return a pointer to an omap_hwmod by name, or NULL if not found.
1289 static struct omap_hwmod
*_lookup(const char *name
)
1291 struct omap_hwmod
*oh
, *temp_oh
;
1295 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
1296 if (!strcmp(name
, temp_oh
->name
)) {
1305 * _init_clkdm - look up a clockdomain name, store pointer in omap_hwmod
1306 * @oh: struct omap_hwmod *
1308 * Convert a clockdomain name stored in a struct omap_hwmod into a
1309 * clockdomain pointer, and save it into the struct omap_hwmod.
1310 * return -EINVAL if clkdm_name does not exist or if the lookup failed.
1312 static int _init_clkdm(struct omap_hwmod
*oh
)
1314 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1317 if (!oh
->clkdm_name
) {
1318 pr_warning("omap_hwmod: %s: no clkdm_name\n", oh
->name
);
1322 oh
->clkdm
= clkdm_lookup(oh
->clkdm_name
);
1324 pr_warning("omap_hwmod: %s: could not associate to clkdm %s\n",
1325 oh
->name
, oh
->clkdm_name
);
1329 pr_debug("omap_hwmod: %s: associated to clkdm %s\n",
1330 oh
->name
, oh
->clkdm_name
);
1336 * _init_clocks - clk_get() all clocks associated with this hwmod. Retrieve as
1337 * well the clockdomain.
1338 * @oh: struct omap_hwmod *
1339 * @data: not used; pass NULL
1341 * Called by omap_hwmod_setup_*() (after omap2_clk_init()).
1342 * Resolves all clock names embedded in the hwmod. Returns 0 on
1343 * success, or a negative error code on failure.
1345 static int _init_clocks(struct omap_hwmod
*oh
, void *data
)
1349 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
1352 pr_debug("omap_hwmod: %s: looking up clocks\n", oh
->name
);
1354 ret
|= _init_main_clk(oh
);
1355 ret
|= _init_interface_clks(oh
);
1356 ret
|= _init_opt_clks(oh
);
1357 ret
|= _init_clkdm(oh
);
1360 oh
->_state
= _HWMOD_STATE_CLKS_INITED
;
1362 pr_warning("omap_hwmod: %s: cannot _init_clocks\n", oh
->name
);
1368 * _wait_target_ready - wait for a module to leave slave idle
1369 * @oh: struct omap_hwmod *
1371 * Wait for a module @oh to leave slave idle. Returns 0 if the module
1372 * does not have an IDLEST bit or if the module successfully leaves
1373 * slave idle; otherwise, pass along the return value of the
1374 * appropriate *_cm*_wait_module_ready() function.
1376 static int _wait_target_ready(struct omap_hwmod
*oh
)
1378 struct omap_hwmod_ocp_if
*os
;
1384 if (oh
->flags
& HWMOD_NO_IDLEST
)
1387 os
= _find_mpu_rt_port(oh
);
1391 /* XXX check module SIDLEMODE */
1393 /* XXX check clock enable states */
1395 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1396 ret
= omap2_cm_wait_module_ready(oh
->prcm
.omap2
.module_offs
,
1397 oh
->prcm
.omap2
.idlest_reg_id
,
1398 oh
->prcm
.omap2
.idlest_idle_bit
);
1399 } else if (cpu_is_omap44xx()) {
1403 ret
= omap4_cminst_wait_module_ready(oh
->clkdm
->prcm_partition
,
1405 oh
->clkdm
->clkdm_offs
,
1406 oh
->prcm
.omap4
.clkctrl_offs
);
1415 * _lookup_hardreset - fill register bit info for this hwmod/reset line
1416 * @oh: struct omap_hwmod *
1417 * @name: name of the reset line in the context of this hwmod
1418 * @ohri: struct omap_hwmod_rst_info * that this function will fill in
1420 * Return the bit position of the reset line that match the
1421 * input name. Return -ENOENT if not found.
1423 static u8
_lookup_hardreset(struct omap_hwmod
*oh
, const char *name
,
1424 struct omap_hwmod_rst_info
*ohri
)
1428 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++) {
1429 const char *rst_line
= oh
->rst_lines
[i
].name
;
1430 if (!strcmp(rst_line
, name
)) {
1431 ohri
->rst_shift
= oh
->rst_lines
[i
].rst_shift
;
1432 ohri
->st_shift
= oh
->rst_lines
[i
].st_shift
;
1433 pr_debug("omap_hwmod: %s: %s: %s: rst %d st %d\n",
1434 oh
->name
, __func__
, rst_line
, ohri
->rst_shift
,
1445 * _assert_hardreset - assert the HW reset line of submodules
1446 * contained in the hwmod module.
1447 * @oh: struct omap_hwmod *
1448 * @name: name of the reset line to lookup and assert
1450 * Some IP like dsp, ipu or iva contain processor that require
1451 * an HW reset line to be assert / deassert in order to enable fully
1454 static int _assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1456 struct omap_hwmod_rst_info ohri
;
1462 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1463 if (IS_ERR_VALUE(ret
))
1466 if (cpu_is_omap24xx() || cpu_is_omap34xx())
1467 return omap2_prm_assert_hardreset(oh
->prcm
.omap2
.module_offs
,
1469 else if (cpu_is_omap44xx())
1470 return omap4_prminst_assert_hardreset(ohri
.rst_shift
,
1471 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
1472 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
1473 oh
->prcm
.omap4
.rstctrl_offs
);
1479 * _deassert_hardreset - deassert the HW reset line of submodules contained
1480 * in the hwmod module.
1481 * @oh: struct omap_hwmod *
1482 * @name: name of the reset line to look up and deassert
1484 * Some IP like dsp, ipu or iva contain processor that require
1485 * an HW reset line to be assert / deassert in order to enable fully
1488 static int _deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
1490 struct omap_hwmod_rst_info ohri
;
1496 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1497 if (IS_ERR_VALUE(ret
))
1500 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1501 ret
= omap2_prm_deassert_hardreset(oh
->prcm
.omap2
.module_offs
,
1504 } else if (cpu_is_omap44xx()) {
1506 pr_err("omap_hwmod: %s: %s: hwmod data error: OMAP4 does not support st_shift\n",
1508 ret
= omap4_prminst_deassert_hardreset(ohri
.rst_shift
,
1509 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
1510 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
1511 oh
->prcm
.omap4
.rstctrl_offs
);
1517 pr_warning("omap_hwmod: %s: failed to hardreset\n", oh
->name
);
1523 * _read_hardreset - read the HW reset line state of submodules
1524 * contained in the hwmod module
1525 * @oh: struct omap_hwmod *
1526 * @name: name of the reset line to look up and read
1528 * Return the state of the reset line.
1530 static int _read_hardreset(struct omap_hwmod
*oh
, const char *name
)
1532 struct omap_hwmod_rst_info ohri
;
1538 ret
= _lookup_hardreset(oh
, name
, &ohri
);
1539 if (IS_ERR_VALUE(ret
))
1542 if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
1543 return omap2_prm_is_hardreset_asserted(oh
->prcm
.omap2
.module_offs
,
1545 } else if (cpu_is_omap44xx()) {
1546 return omap4_prminst_is_hardreset_asserted(ohri
.rst_shift
,
1547 oh
->clkdm
->pwrdm
.ptr
->prcm_partition
,
1548 oh
->clkdm
->pwrdm
.ptr
->prcm_offs
,
1549 oh
->prcm
.omap4
.rstctrl_offs
);
1556 * _are_any_hardreset_lines_asserted - return true if part of @oh is hard-reset
1557 * @oh: struct omap_hwmod *
1559 * If any hardreset line associated with @oh is asserted, then return true.
1560 * Otherwise, if @oh has no hardreset lines associated with it, or if
1561 * no hardreset lines associated with @oh are asserted, then return false.
1562 * This function is used to avoid executing some parts of the IP block
1563 * enable/disable sequence if a hardreset line is set.
1565 static bool _are_any_hardreset_lines_asserted(struct omap_hwmod
*oh
)
1569 if (oh
->rst_lines_cnt
== 0)
1572 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1573 if (_read_hardreset(oh
, oh
->rst_lines
[i
].name
) > 0)
1580 * _omap4_disable_module - enable CLKCTRL modulemode on OMAP4
1581 * @oh: struct omap_hwmod *
1583 * Disable the PRCM module mode related to the hwmod @oh.
1584 * Return EINVAL if the modulemode is not supported and 0 in case of success.
1586 static int _omap4_disable_module(struct omap_hwmod
*oh
)
1590 if (!oh
->clkdm
|| !oh
->prcm
.omap4
.modulemode
)
1593 pr_debug("omap_hwmod: %s: %s\n", oh
->name
, __func__
);
1595 omap4_cminst_module_disable(oh
->clkdm
->prcm_partition
,
1597 oh
->clkdm
->clkdm_offs
,
1598 oh
->prcm
.omap4
.clkctrl_offs
);
1600 if (_are_any_hardreset_lines_asserted(oh
))
1603 v
= _omap4_wait_target_disable(oh
);
1605 pr_warn("omap_hwmod: %s: _wait_target_disable failed\n",
1612 * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
1613 * @oh: struct omap_hwmod *
1615 * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit. hwmod must be
1616 * enabled for this to work. Returns -ENOENT if the hwmod cannot be
1617 * reset this way, -EINVAL if the hwmod is in the wrong state,
1618 * -ETIMEDOUT if the module did not reset in time, or 0 upon success.
1620 * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
1621 * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
1622 * use the SYSCONFIG softreset bit to provide the status.
1624 * Note that some IP like McBSP do have reset control but don't have
1627 static int _ocp_softreset(struct omap_hwmod
*oh
)
1629 u32 v
, softrst_mask
;
1633 if (!oh
->class->sysc
||
1634 !(oh
->class->sysc
->sysc_flags
& SYSC_HAS_SOFTRESET
))
1637 /* clocks must be on for this operation */
1638 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1639 pr_warning("omap_hwmod: %s: reset can only be entered from "
1640 "enabled state\n", oh
->name
);
1644 /* For some modules, all optionnal clocks need to be enabled as well */
1645 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1646 _enable_optional_clocks(oh
);
1648 pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh
->name
);
1650 v
= oh
->_sysc_cache
;
1651 ret
= _set_softreset(oh
, &v
);
1654 _write_sysconfig(v
, oh
);
1656 if (oh
->class->sysc
->srst_udelay
)
1657 udelay(oh
->class->sysc
->srst_udelay
);
1659 if (oh
->class->sysc
->sysc_flags
& SYSS_HAS_RESET_STATUS
)
1660 omap_test_timeout((omap_hwmod_read(oh
,
1661 oh
->class->sysc
->syss_offs
)
1662 & SYSS_RESETDONE_MASK
),
1663 MAX_MODULE_SOFTRESET_WAIT
, c
);
1664 else if (oh
->class->sysc
->sysc_flags
& SYSC_HAS_RESET_STATUS
) {
1665 softrst_mask
= (0x1 << oh
->class->sysc
->sysc_fields
->srst_shift
);
1666 omap_test_timeout(!(omap_hwmod_read(oh
,
1667 oh
->class->sysc
->sysc_offs
)
1669 MAX_MODULE_SOFTRESET_WAIT
, c
);
1672 if (c
== MAX_MODULE_SOFTRESET_WAIT
)
1673 pr_warning("omap_hwmod: %s: softreset failed (waited %d usec)\n",
1674 oh
->name
, MAX_MODULE_SOFTRESET_WAIT
);
1676 pr_debug("omap_hwmod: %s: softreset in %d usec\n", oh
->name
, c
);
1679 * XXX add _HWMOD_STATE_WEDGED for modules that don't come back from
1680 * _wait_target_ready() or _reset()
1683 ret
= (c
== MAX_MODULE_SOFTRESET_WAIT
) ? -ETIMEDOUT
: 0;
1686 if (oh
->flags
& HWMOD_CONTROL_OPT_CLKS_IN_RESET
)
1687 _disable_optional_clocks(oh
);
1693 * _reset - reset an omap_hwmod
1694 * @oh: struct omap_hwmod *
1696 * Resets an omap_hwmod @oh. If the module has a custom reset
1697 * function pointer defined, then call it to reset the IP block, and
1698 * pass along its return value to the caller. Otherwise, if the IP
1699 * block has an OCP_SYSCONFIG register with a SOFTRESET bitfield
1700 * associated with it, call a function to reset the IP block via that
1701 * method, and pass along the return value to the caller. Finally, if
1702 * the IP block has some hardreset lines associated with it, assert
1703 * all of those, but do _not_ deassert them. (This is because driver
1704 * authors have expressed an apparent requirement to control the
1705 * deassertion of the hardreset lines themselves.)
1707 * The default software reset mechanism for most OMAP IP blocks is
1708 * triggered via the OCP_SYSCONFIG.SOFTRESET bit. However, some
1709 * hwmods cannot be reset via this method. Some are not targets and
1710 * therefore have no OCP header registers to access. Others (like the
1711 * IVA) have idiosyncratic reset sequences. So for these relatively
1712 * rare cases, custom reset code can be supplied in the struct
1713 * omap_hwmod_class .reset function pointer. Passes along the return
1714 * value from either _ocp_softreset() or the custom reset function -
1715 * these must return -EINVAL if the hwmod cannot be reset this way or
1716 * if the hwmod is in the wrong state, -ETIMEDOUT if the module did
1717 * not reset in time, or 0 upon success.
1719 static int _reset(struct omap_hwmod
*oh
)
1723 pr_debug("omap_hwmod: %s: resetting\n", oh
->name
);
1725 if (oh
->class->reset
) {
1726 r
= oh
->class->reset(oh
);
1728 if (oh
->rst_lines_cnt
> 0) {
1729 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
1730 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
1733 r
= _ocp_softreset(oh
);
1740 * OCP_SYSCONFIG bits need to be reprogrammed after a
1741 * softreset. The _enable() function should be split to avoid
1742 * the rewrite of the OCP_SYSCONFIG register.
1744 if (oh
->class->sysc
) {
1745 _update_sysc_cache(oh
);
1753 * _enable - enable an omap_hwmod
1754 * @oh: struct omap_hwmod *
1756 * Enables an omap_hwmod @oh such that the MPU can access the hwmod's
1757 * register target. Returns -EINVAL if the hwmod is in the wrong
1758 * state or passes along the return value of _wait_target_ready().
1760 static int _enable(struct omap_hwmod
*oh
)
1765 pr_debug("omap_hwmod: %s: enabling\n", oh
->name
);
1768 * hwmods with HWMOD_INIT_NO_IDLE flag set are left in enabled
1769 * state at init. Now that someone is really trying to enable
1770 * them, just ensure that the hwmod mux is set.
1772 if (oh
->_int_flags
& _HWMOD_SKIP_ENABLE
) {
1774 * If the caller has mux data populated, do the mux'ing
1775 * which wouldn't have been done as part of the _enable()
1776 * done during setup.
1779 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
1781 oh
->_int_flags
&= ~_HWMOD_SKIP_ENABLE
;
1785 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
&&
1786 oh
->_state
!= _HWMOD_STATE_IDLE
&&
1787 oh
->_state
!= _HWMOD_STATE_DISABLED
) {
1788 WARN(1, "omap_hwmod: %s: enabled state can only be entered from initialized, idle, or disabled state\n",
1794 * If an IP block contains HW reset lines and any of them are
1795 * asserted, we let integration code associated with that
1796 * block handle the enable. We've received very little
1797 * information on what those driver authors need, and until
1798 * detailed information is provided and the driver code is
1799 * posted to the public lists, this is probably the best we
1802 if (_are_any_hardreset_lines_asserted(oh
))
1805 /* Mux pins for device runtime if populated */
1806 if (oh
->mux
&& (!oh
->mux
->enabled
||
1807 ((oh
->_state
== _HWMOD_STATE_IDLE
) &&
1808 oh
->mux
->pads_dynamic
)))
1809 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_ENABLED
);
1811 _add_initiator_dep(oh
, mpu_oh
);
1815 * A clockdomain must be in SW_SUP before enabling
1816 * completely the module. The clockdomain can be set
1817 * in HW_AUTO only when the module become ready.
1819 hwsup
= clkdm_in_hwsup(oh
->clkdm
);
1820 r
= clkdm_hwmod_enable(oh
->clkdm
, oh
);
1822 WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n",
1823 oh
->name
, oh
->clkdm
->name
, r
);
1829 if (soc_ops
.enable_module
)
1830 soc_ops
.enable_module(oh
);
1832 r
= _wait_target_ready(oh
);
1835 * Set the clockdomain to HW_AUTO only if the target is ready,
1836 * assuming that the previous state was HW_AUTO
1838 if (oh
->clkdm
&& hwsup
)
1839 clkdm_allow_idle(oh
->clkdm
);
1841 oh
->_state
= _HWMOD_STATE_ENABLED
;
1843 /* Access the sysconfig only if the target is ready */
1844 if (oh
->class->sysc
) {
1845 if (!(oh
->_int_flags
& _HWMOD_SYSCONFIG_LOADED
))
1846 _update_sysc_cache(oh
);
1850 _disable_clocks(oh
);
1851 pr_debug("omap_hwmod: %s: _wait_target_ready: %d\n",
1855 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1862 * _idle - idle an omap_hwmod
1863 * @oh: struct omap_hwmod *
1865 * Idles an omap_hwmod @oh. This should be called once the hwmod has
1866 * no further work. Returns -EINVAL if the hwmod is in the wrong
1867 * state or returns 0.
1869 static int _idle(struct omap_hwmod
*oh
)
1871 pr_debug("omap_hwmod: %s: idling\n", oh
->name
);
1873 if (oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1874 WARN(1, "omap_hwmod: %s: idle state can only be entered from enabled state\n",
1879 if (_are_any_hardreset_lines_asserted(oh
))
1882 if (oh
->class->sysc
)
1884 _del_initiator_dep(oh
, mpu_oh
);
1886 if (soc_ops
.disable_module
)
1887 soc_ops
.disable_module(oh
);
1890 * The module must be in idle mode before disabling any parents
1891 * clocks. Otherwise, the parent clock might be disabled before
1892 * the module transition is done, and thus will prevent the
1893 * transition to complete properly.
1895 _disable_clocks(oh
);
1897 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1899 /* Mux pins for device idle if populated */
1900 if (oh
->mux
&& oh
->mux
->pads_dynamic
)
1901 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_IDLE
);
1903 oh
->_state
= _HWMOD_STATE_IDLE
;
1909 * omap_hwmod_set_ocp_autoidle - set the hwmod's OCP autoidle bit
1910 * @oh: struct omap_hwmod *
1911 * @autoidle: desired AUTOIDLE bitfield value (0 or 1)
1913 * Sets the IP block's OCP autoidle bit in hardware, and updates our
1914 * local copy. Intended to be used by drivers that require
1915 * direct manipulation of the AUTOIDLE bits.
1916 * Returns -EINVAL if @oh is null or is not in the ENABLED state, or passes
1917 * along the return value from _set_module_autoidle().
1919 * Any users of this function should be scrutinized carefully.
1921 int omap_hwmod_set_ocp_autoidle(struct omap_hwmod
*oh
, u8 autoidle
)
1925 unsigned long flags
;
1927 if (!oh
|| oh
->_state
!= _HWMOD_STATE_ENABLED
)
1930 spin_lock_irqsave(&oh
->_lock
, flags
);
1932 v
= oh
->_sysc_cache
;
1934 retval
= _set_module_autoidle(oh
, autoidle
, &v
);
1937 _write_sysconfig(v
, oh
);
1939 spin_unlock_irqrestore(&oh
->_lock
, flags
);
1945 * _shutdown - shutdown an omap_hwmod
1946 * @oh: struct omap_hwmod *
1948 * Shut down an omap_hwmod @oh. This should be called when the driver
1949 * used for the hwmod is removed or unloaded or if the driver is not
1950 * used by the system. Returns -EINVAL if the hwmod is in the wrong
1951 * state or returns 0.
1953 static int _shutdown(struct omap_hwmod
*oh
)
1958 if (oh
->_state
!= _HWMOD_STATE_IDLE
&&
1959 oh
->_state
!= _HWMOD_STATE_ENABLED
) {
1960 WARN(1, "omap_hwmod: %s: disabled state can only be entered from idle, or enabled state\n",
1965 if (_are_any_hardreset_lines_asserted(oh
))
1968 pr_debug("omap_hwmod: %s: disabling\n", oh
->name
);
1970 if (oh
->class->pre_shutdown
) {
1971 prev_state
= oh
->_state
;
1972 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1974 ret
= oh
->class->pre_shutdown(oh
);
1976 if (prev_state
== _HWMOD_STATE_IDLE
)
1982 if (oh
->class->sysc
) {
1983 if (oh
->_state
== _HWMOD_STATE_IDLE
)
1988 /* clocks and deps are already disabled in idle */
1989 if (oh
->_state
== _HWMOD_STATE_ENABLED
) {
1990 _del_initiator_dep(oh
, mpu_oh
);
1991 /* XXX what about the other system initiators here? dma, dsp */
1992 if (soc_ops
.disable_module
)
1993 soc_ops
.disable_module(oh
);
1994 _disable_clocks(oh
);
1996 clkdm_hwmod_disable(oh
->clkdm
, oh
);
1998 /* XXX Should this code also force-disable the optional clocks? */
2000 for (i
= 0; i
< oh
->rst_lines_cnt
; i
++)
2001 _assert_hardreset(oh
, oh
->rst_lines
[i
].name
);
2003 /* Mux pins to safe mode or use populated off mode values */
2005 omap_hwmod_mux(oh
->mux
, _HWMOD_STATE_DISABLED
);
2007 oh
->_state
= _HWMOD_STATE_DISABLED
;
2013 * _init_mpu_rt_base - populate the virtual address for a hwmod
2014 * @oh: struct omap_hwmod * to locate the virtual address
2016 * Cache the virtual address used by the MPU to access this IP block's
2017 * registers. This address is needed early so the OCP registers that
2018 * are part of the device's address space can be ioremapped properly.
2021 static void __init
_init_mpu_rt_base(struct omap_hwmod
*oh
, void *data
)
2023 struct omap_hwmod_addr_space
*mem
;
2024 void __iomem
*va_start
;
2029 _save_mpu_port_index(oh
);
2031 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
2034 mem
= _find_mpu_rt_addr_space(oh
);
2036 pr_debug("omap_hwmod: %s: no MPU register target found\n",
2041 va_start
= ioremap(mem
->pa_start
, mem
->pa_end
- mem
->pa_start
);
2043 pr_err("omap_hwmod: %s: Could not ioremap\n", oh
->name
);
2047 pr_debug("omap_hwmod: %s: MPU register target at va %p\n",
2048 oh
->name
, va_start
);
2050 oh
->_mpu_rt_va
= va_start
;
2054 * _init - initialize internal data for the hwmod @oh
2055 * @oh: struct omap_hwmod *
2058 * Look up the clocks and the address space used by the MPU to access
2059 * registers belonging to the hwmod @oh. @oh must already be
2060 * registered at this point. This is the first of two phases for
2061 * hwmod initialization. Code called here does not touch any hardware
2062 * registers, it simply prepares internal data structures. Returns 0
2063 * upon success or if the hwmod isn't registered, or -EINVAL upon
2066 static int __init
_init(struct omap_hwmod
*oh
, void *data
)
2070 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
)
2073 _init_mpu_rt_base(oh
, NULL
);
2075 r
= _init_clocks(oh
, NULL
);
2076 if (IS_ERR_VALUE(r
)) {
2077 WARN(1, "omap_hwmod: %s: couldn't init clocks\n", oh
->name
);
2081 oh
->_state
= _HWMOD_STATE_INITIALIZED
;
2087 * _setup_iclk_autoidle - configure an IP block's interface clocks
2088 * @oh: struct omap_hwmod *
2090 * Set up the module's interface clocks. XXX This function is still mostly
2091 * a stub; implementing this properly requires iclk autoidle usecounting in
2092 * the clock code. No return value.
2094 static void __init
_setup_iclk_autoidle(struct omap_hwmod
*oh
)
2096 struct omap_hwmod_ocp_if
*os
;
2097 struct list_head
*p
;
2099 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2102 p
= oh
->slave_ports
.next
;
2104 while (i
< oh
->slaves_cnt
) {
2105 os
= _fetch_next_ocp_if(&p
, &i
);
2109 if (os
->flags
& OCPIF_SWSUP_IDLE
) {
2110 /* XXX omap_iclk_deny_idle(c); */
2112 /* XXX omap_iclk_allow_idle(c); */
2113 clk_enable(os
->_clk
);
2121 * _setup_reset - reset an IP block during the setup process
2122 * @oh: struct omap_hwmod *
2124 * Reset the IP block corresponding to the hwmod @oh during the setup
2125 * process. The IP block is first enabled so it can be successfully
2126 * reset. Returns 0 upon success or a negative error code upon
2129 static int __init
_setup_reset(struct omap_hwmod
*oh
)
2133 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2136 if (oh
->rst_lines_cnt
== 0) {
2139 pr_warning("omap_hwmod: %s: cannot be enabled for reset (%d)\n",
2140 oh
->name
, oh
->_state
);
2145 if (!(oh
->flags
& HWMOD_INIT_NO_RESET
))
2152 * _setup_postsetup - transition to the appropriate state after _setup
2153 * @oh: struct omap_hwmod *
2155 * Place an IP block represented by @oh into a "post-setup" state --
2156 * either IDLE, ENABLED, or DISABLED. ("post-setup" simply means that
2157 * this function is called at the end of _setup().) The postsetup
2158 * state for an IP block can be changed by calling
2159 * omap_hwmod_enter_postsetup_state() early in the boot process,
2160 * before one of the omap_hwmod_setup*() functions are called for the
2163 * The IP block stays in this state until a PM runtime-based driver is
2164 * loaded for that IP block. A post-setup state of IDLE is
2165 * appropriate for almost all IP blocks with runtime PM-enabled
2166 * drivers, since those drivers are able to enable the IP block. A
2167 * post-setup state of ENABLED is appropriate for kernels with PM
2168 * runtime disabled. The DISABLED state is appropriate for unusual IP
2169 * blocks such as the MPU WDTIMER on kernels without WDTIMER drivers
2170 * included, since the WDTIMER starts running on reset and will reset
2171 * the MPU if left active.
2173 * This post-setup mechanism is deprecated. Once all of the OMAP
2174 * drivers have been converted to use PM runtime, and all of the IP
2175 * block data and interconnect data is available to the hwmod code, it
2176 * should be possible to replace this mechanism with a "lazy reset"
2177 * arrangement. In a "lazy reset" setup, each IP block is enabled
2178 * when the driver first probes, then all remaining IP blocks without
2179 * drivers are either shut down or enabled after the drivers have
2180 * loaded. However, this cannot take place until the above
2181 * preconditions have been met, since otherwise the late reset code
2182 * has no way of knowing which IP blocks are in use by drivers, and
2183 * which ones are unused.
2187 static void __init
_setup_postsetup(struct omap_hwmod
*oh
)
2191 if (oh
->rst_lines_cnt
> 0)
2194 postsetup_state
= oh
->_postsetup_state
;
2195 if (postsetup_state
== _HWMOD_STATE_UNKNOWN
)
2196 postsetup_state
= _HWMOD_STATE_ENABLED
;
2199 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
2200 * it should be set by the core code as a runtime flag during startup
2202 if ((oh
->flags
& HWMOD_INIT_NO_IDLE
) &&
2203 (postsetup_state
== _HWMOD_STATE_IDLE
)) {
2204 oh
->_int_flags
|= _HWMOD_SKIP_ENABLE
;
2205 postsetup_state
= _HWMOD_STATE_ENABLED
;
2208 if (postsetup_state
== _HWMOD_STATE_IDLE
)
2210 else if (postsetup_state
== _HWMOD_STATE_DISABLED
)
2212 else if (postsetup_state
!= _HWMOD_STATE_ENABLED
)
2213 WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n",
2214 oh
->name
, postsetup_state
);
2220 * _setup - prepare IP block hardware for use
2221 * @oh: struct omap_hwmod *
2222 * @n: (unused, pass NULL)
2224 * Configure the IP block represented by @oh. This may include
2225 * enabling the IP block, resetting it, and placing it into a
2226 * post-setup state, depending on the type of IP block and applicable
2227 * flags. IP blocks are reset to prevent any previous configuration
2228 * by the bootloader or previous operating system from interfering
2229 * with power management or other parts of the system. The reset can
2230 * be avoided; see omap_hwmod_no_setup_reset(). This is the second of
2231 * two phases for hwmod initialization. Code called here generally
2232 * affects the IP block hardware, or system integration hardware
2233 * associated with the IP block. Returns 0.
2235 static int __init
_setup(struct omap_hwmod
*oh
, void *data
)
2237 if (oh
->_state
!= _HWMOD_STATE_INITIALIZED
)
2240 _setup_iclk_autoidle(oh
);
2242 if (!_setup_reset(oh
))
2243 _setup_postsetup(oh
);
2249 * _register - register a struct omap_hwmod
2250 * @oh: struct omap_hwmod *
2252 * Registers the omap_hwmod @oh. Returns -EEXIST if an omap_hwmod
2253 * already has been registered by the same name; -EINVAL if the
2254 * omap_hwmod is in the wrong state, if @oh is NULL, if the
2255 * omap_hwmod's class field is NULL; if the omap_hwmod is missing a
2256 * name, or if the omap_hwmod's class is missing a name; or 0 upon
2259 * XXX The data should be copied into bootmem, so the original data
2260 * should be marked __initdata and freed after init. This would allow
2261 * unneeded omap_hwmods to be freed on multi-OMAP configurations. Note
2262 * that the copy process would be relatively complex due to the large number
2265 static int __init
_register(struct omap_hwmod
*oh
)
2267 if (!oh
|| !oh
->name
|| !oh
->class || !oh
->class->name
||
2268 (oh
->_state
!= _HWMOD_STATE_UNKNOWN
))
2271 pr_debug("omap_hwmod: %s: registering\n", oh
->name
);
2273 if (_lookup(oh
->name
))
2276 list_add_tail(&oh
->node
, &omap_hwmod_list
);
2278 INIT_LIST_HEAD(&oh
->master_ports
);
2279 INIT_LIST_HEAD(&oh
->slave_ports
);
2280 spin_lock_init(&oh
->_lock
);
2282 oh
->_state
= _HWMOD_STATE_REGISTERED
;
2285 * XXX Rather than doing a strcmp(), this should test a flag
2286 * set in the hwmod data, inserted by the autogenerator code.
2288 if (!strcmp(oh
->name
, MPU_INITIATOR_NAME
))
2295 * _alloc_links - return allocated memory for hwmod links
2296 * @ml: pointer to a struct omap_hwmod_link * for the master link
2297 * @sl: pointer to a struct omap_hwmod_link * for the slave link
2299 * Return pointers to two struct omap_hwmod_link records, via the
2300 * addresses pointed to by @ml and @sl. Will first attempt to return
2301 * memory allocated as part of a large initial block, but if that has
2302 * been exhausted, will allocate memory itself. Since ideally this
2303 * second allocation path will never occur, the number of these
2304 * 'supplemental' allocations will be logged when debugging is
2305 * enabled. Returns 0.
2307 static int __init
_alloc_links(struct omap_hwmod_link
**ml
,
2308 struct omap_hwmod_link
**sl
)
2312 if ((free_ls
+ LINKS_PER_OCP_IF
) <= max_ls
) {
2313 *ml
= &linkspace
[free_ls
++];
2314 *sl
= &linkspace
[free_ls
++];
2318 sz
= sizeof(struct omap_hwmod_link
) * LINKS_PER_OCP_IF
;
2321 *ml
= alloc_bootmem(sz
);
2325 *sl
= (void *)(*ml
) + sizeof(struct omap_hwmod_link
);
2328 pr_debug("omap_hwmod: supplemental link allocations needed: %d\n",
2329 ls_supp
* LINKS_PER_OCP_IF
);
2335 * _add_link - add an interconnect between two IP blocks
2336 * @oi: pointer to a struct omap_hwmod_ocp_if record
2338 * Add struct omap_hwmod_link records connecting the master IP block
2339 * specified in @oi->master to @oi, and connecting the slave IP block
2340 * specified in @oi->slave to @oi. This code is assumed to run before
2341 * preemption or SMP has been enabled, thus avoiding the need for
2342 * locking in this code. Changes to this assumption will require
2343 * additional locking. Returns 0.
2345 static int __init
_add_link(struct omap_hwmod_ocp_if
*oi
)
2347 struct omap_hwmod_link
*ml
, *sl
;
2349 pr_debug("omap_hwmod: %s -> %s: adding link\n", oi
->master
->name
,
2352 _alloc_links(&ml
, &sl
);
2355 INIT_LIST_HEAD(&ml
->node
);
2356 list_add(&ml
->node
, &oi
->master
->master_ports
);
2357 oi
->master
->masters_cnt
++;
2360 INIT_LIST_HEAD(&sl
->node
);
2361 list_add(&sl
->node
, &oi
->slave
->slave_ports
);
2362 oi
->slave
->slaves_cnt
++;
2368 * _register_link - register a struct omap_hwmod_ocp_if
2369 * @oi: struct omap_hwmod_ocp_if *
2371 * Registers the omap_hwmod_ocp_if record @oi. Returns -EEXIST if it
2372 * has already been registered; -EINVAL if @oi is NULL or if the
2373 * record pointed to by @oi is missing required fields; or 0 upon
2376 * XXX The data should be copied into bootmem, so the original data
2377 * should be marked __initdata and freed after init. This would allow
2378 * unneeded omap_hwmods to be freed on multi-OMAP configurations.
2380 static int __init
_register_link(struct omap_hwmod_ocp_if
*oi
)
2382 if (!oi
|| !oi
->master
|| !oi
->slave
|| !oi
->user
)
2385 if (oi
->_int_flags
& _OCPIF_INT_FLAGS_REGISTERED
)
2388 pr_debug("omap_hwmod: registering link from %s to %s\n",
2389 oi
->master
->name
, oi
->slave
->name
);
2392 * Register the connected hwmods, if they haven't been
2393 * registered already
2395 if (oi
->master
->_state
!= _HWMOD_STATE_REGISTERED
)
2396 _register(oi
->master
);
2398 if (oi
->slave
->_state
!= _HWMOD_STATE_REGISTERED
)
2399 _register(oi
->slave
);
2403 oi
->_int_flags
|= _OCPIF_INT_FLAGS_REGISTERED
;
2409 * _alloc_linkspace - allocate large block of hwmod links
2410 * @ois: pointer to an array of struct omap_hwmod_ocp_if records to count
2412 * Allocate a large block of struct omap_hwmod_link records. This
2413 * improves boot time significantly by avoiding the need to allocate
2414 * individual records one by one. If the number of records to
2415 * allocate in the block hasn't been manually specified, this function
2416 * will count the number of struct omap_hwmod_ocp_if records in @ois
2417 * and use that to determine the allocation size. For SoC families
2418 * that require multiple list registrations, such as OMAP3xxx, this
2419 * estimation process isn't optimal, so manual estimation is advised
2420 * in those cases. Returns -EEXIST if the allocation has already occurred
2421 * or 0 upon success.
2423 static int __init
_alloc_linkspace(struct omap_hwmod_ocp_if
**ois
)
2429 WARN(1, "linkspace already allocated\n");
2435 max_ls
+= LINKS_PER_OCP_IF
;
2437 sz
= sizeof(struct omap_hwmod_link
) * max_ls
;
2439 pr_debug("omap_hwmod: %s: allocating %d byte linkspace (%d links)\n",
2440 __func__
, sz
, max_ls
);
2442 linkspace
= alloc_bootmem(sz
);
2444 memset(linkspace
, 0, sz
);
2449 /* Public functions */
2451 u32
omap_hwmod_read(struct omap_hwmod
*oh
, u16 reg_offs
)
2453 if (oh
->flags
& HWMOD_16BIT_REG
)
2454 return __raw_readw(oh
->_mpu_rt_va
+ reg_offs
);
2456 return __raw_readl(oh
->_mpu_rt_va
+ reg_offs
);
2459 void omap_hwmod_write(u32 v
, struct omap_hwmod
*oh
, u16 reg_offs
)
2461 if (oh
->flags
& HWMOD_16BIT_REG
)
2462 __raw_writew(v
, oh
->_mpu_rt_va
+ reg_offs
);
2464 __raw_writel(v
, oh
->_mpu_rt_va
+ reg_offs
);
2468 * omap_hwmod_softreset - reset a module via SYSCONFIG.SOFTRESET bit
2469 * @oh: struct omap_hwmod *
2471 * This is a public function exposed to drivers. Some drivers may need to do
2472 * some settings before and after resetting the device. Those drivers after
2473 * doing the necessary settings could use this function to start a reset by
2474 * setting the SYSCONFIG.SOFTRESET bit.
2476 int omap_hwmod_softreset(struct omap_hwmod
*oh
)
2481 if (!oh
|| !(oh
->_sysc_cache
))
2484 v
= oh
->_sysc_cache
;
2485 ret
= _set_softreset(oh
, &v
);
2488 _write_sysconfig(v
, oh
);
2495 * omap_hwmod_set_slave_idlemode - set the hwmod's OCP slave idlemode
2496 * @oh: struct omap_hwmod *
2497 * @idlemode: SIDLEMODE field bits (shifted to bit 0)
2499 * Sets the IP block's OCP slave idlemode in hardware, and updates our
2500 * local copy. Intended to be used by drivers that have some erratum
2501 * that requires direct manipulation of the SIDLEMODE bits. Returns
2502 * -EINVAL if @oh is null, or passes along the return value from
2503 * _set_slave_idlemode().
2505 * XXX Does this function have any current users? If not, we should
2506 * remove it; it is better to let the rest of the hwmod code handle this.
2507 * Any users of this function should be scrutinized carefully.
2509 int omap_hwmod_set_slave_idlemode(struct omap_hwmod
*oh
, u8 idlemode
)
2517 v
= oh
->_sysc_cache
;
2519 retval
= _set_slave_idlemode(oh
, idlemode
, &v
);
2521 _write_sysconfig(v
, oh
);
2527 * omap_hwmod_lookup - look up a registered omap_hwmod by name
2528 * @name: name of the omap_hwmod to look up
2530 * Given a @name of an omap_hwmod, return a pointer to the registered
2531 * struct omap_hwmod *, or NULL upon error.
2533 struct omap_hwmod
*omap_hwmod_lookup(const char *name
)
2535 struct omap_hwmod
*oh
;
2546 * omap_hwmod_for_each - call function for each registered omap_hwmod
2547 * @fn: pointer to a callback function
2548 * @data: void * data to pass to callback function
2550 * Call @fn for each registered omap_hwmod, passing @data to each
2551 * function. @fn must return 0 for success or any other value for
2552 * failure. If @fn returns non-zero, the iteration across omap_hwmods
2553 * will stop and the non-zero return value will be passed to the
2554 * caller of omap_hwmod_for_each(). @fn is called with
2555 * omap_hwmod_for_each() held.
2557 int omap_hwmod_for_each(int (*fn
)(struct omap_hwmod
*oh
, void *data
),
2560 struct omap_hwmod
*temp_oh
;
2566 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
2567 ret
= (*fn
)(temp_oh
, data
);
2576 * omap_hwmod_register_links - register an array of hwmod links
2577 * @ois: pointer to an array of omap_hwmod_ocp_if to register
2579 * Intended to be called early in boot before the clock framework is
2580 * initialized. If @ois is not null, will register all omap_hwmods
2581 * listed in @ois that are valid for this chip. Returns -EINVAL if
2582 * omap_hwmod_init() hasn't been called before calling this function,
2583 * -ENOMEM if the link memory area can't be allocated, or 0 upon
2586 int __init
omap_hwmod_register_links(struct omap_hwmod_ocp_if
**ois
)
2597 if (_alloc_linkspace(ois
)) {
2598 pr_err("omap_hwmod: could not allocate link space\n");
2605 r
= _register_link(ois
[i
]);
2606 WARN(r
&& r
!= -EEXIST
,
2607 "omap_hwmod: _register_link(%s -> %s) returned %d\n",
2608 ois
[i
]->master
->name
, ois
[i
]->slave
->name
, r
);
2615 * _ensure_mpu_hwmod_is_setup - ensure the MPU SS hwmod is init'ed and set up
2616 * @oh: pointer to the hwmod currently being set up (usually not the MPU)
2618 * If the hwmod data corresponding to the MPU subsystem IP block
2619 * hasn't been initialized and set up yet, do so now. This must be
2620 * done first since sleep dependencies may be added from other hwmods
2621 * to the MPU. Intended to be called only by omap_hwmod_setup*(). No
2624 static void __init
_ensure_mpu_hwmod_is_setup(struct omap_hwmod
*oh
)
2626 if (!mpu_oh
|| mpu_oh
->_state
== _HWMOD_STATE_UNKNOWN
)
2627 pr_err("omap_hwmod: %s: MPU initiator hwmod %s not yet registered\n",
2628 __func__
, MPU_INITIATOR_NAME
);
2629 else if (mpu_oh
->_state
== _HWMOD_STATE_REGISTERED
&& oh
!= mpu_oh
)
2630 omap_hwmod_setup_one(MPU_INITIATOR_NAME
);
2634 * omap_hwmod_setup_one - set up a single hwmod
2635 * @oh_name: const char * name of the already-registered hwmod to set up
2637 * Initialize and set up a single hwmod. Intended to be used for a
2638 * small number of early devices, such as the timer IP blocks used for
2639 * the scheduler clock. Must be called after omap2_clk_init().
2640 * Resolves the struct clk names to struct clk pointers for each
2641 * registered omap_hwmod. Also calls _setup() on each hwmod. Returns
2642 * -EINVAL upon error or 0 upon success.
2644 int __init
omap_hwmod_setup_one(const char *oh_name
)
2646 struct omap_hwmod
*oh
;
2648 pr_debug("omap_hwmod: %s: %s\n", oh_name
, __func__
);
2650 oh
= _lookup(oh_name
);
2652 WARN(1, "omap_hwmod: %s: hwmod not yet registered\n", oh_name
);
2656 _ensure_mpu_hwmod_is_setup(oh
);
2665 * omap_hwmod_setup_all - set up all registered IP blocks
2667 * Initialize and set up all IP blocks registered with the hwmod code.
2668 * Must be called after omap2_clk_init(). Resolves the struct clk
2669 * names to struct clk pointers for each registered omap_hwmod. Also
2670 * calls _setup() on each hwmod. Returns 0 upon success.
2672 static int __init
omap_hwmod_setup_all(void)
2674 _ensure_mpu_hwmod_is_setup(NULL
);
2676 omap_hwmod_for_each(_init
, NULL
);
2677 omap_hwmod_for_each(_setup
, NULL
);
2681 core_initcall(omap_hwmod_setup_all
);
2684 * omap_hwmod_enable - enable an omap_hwmod
2685 * @oh: struct omap_hwmod *
2687 * Enable an omap_hwmod @oh. Intended to be called by omap_device_enable().
2688 * Returns -EINVAL on error or passes along the return value from _enable().
2690 int omap_hwmod_enable(struct omap_hwmod
*oh
)
2693 unsigned long flags
;
2698 spin_lock_irqsave(&oh
->_lock
, flags
);
2700 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2706 * omap_hwmod_idle - idle an omap_hwmod
2707 * @oh: struct omap_hwmod *
2709 * Idle an omap_hwmod @oh. Intended to be called by omap_device_idle().
2710 * Returns -EINVAL on error or passes along the return value from _idle().
2712 int omap_hwmod_idle(struct omap_hwmod
*oh
)
2714 unsigned long flags
;
2719 spin_lock_irqsave(&oh
->_lock
, flags
);
2721 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2727 * omap_hwmod_shutdown - shutdown an omap_hwmod
2728 * @oh: struct omap_hwmod *
2730 * Shutdown an omap_hwmod @oh. Intended to be called by
2731 * omap_device_shutdown(). Returns -EINVAL on error or passes along
2732 * the return value from _shutdown().
2734 int omap_hwmod_shutdown(struct omap_hwmod
*oh
)
2736 unsigned long flags
;
2741 spin_lock_irqsave(&oh
->_lock
, flags
);
2743 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2749 * omap_hwmod_enable_clocks - enable main_clk, all interface clocks
2750 * @oh: struct omap_hwmod *oh
2752 * Intended to be called by the omap_device code.
2754 int omap_hwmod_enable_clocks(struct omap_hwmod
*oh
)
2756 unsigned long flags
;
2758 spin_lock_irqsave(&oh
->_lock
, flags
);
2760 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2766 * omap_hwmod_disable_clocks - disable main_clk, all interface clocks
2767 * @oh: struct omap_hwmod *oh
2769 * Intended to be called by the omap_device code.
2771 int omap_hwmod_disable_clocks(struct omap_hwmod
*oh
)
2773 unsigned long flags
;
2775 spin_lock_irqsave(&oh
->_lock
, flags
);
2776 _disable_clocks(oh
);
2777 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2783 * omap_hwmod_ocp_barrier - wait for posted writes against the hwmod to complete
2784 * @oh: struct omap_hwmod *oh
2786 * Intended to be called by drivers and core code when all posted
2787 * writes to a device must complete before continuing further
2788 * execution (for example, after clearing some device IRQSTATUS
2791 * XXX what about targets with multiple OCP threads?
2793 void omap_hwmod_ocp_barrier(struct omap_hwmod
*oh
)
2797 if (!oh
->class->sysc
|| !oh
->class->sysc
->sysc_flags
) {
2798 WARN(1, "omap_device: %s: OCP barrier impossible due to device configuration\n",
2804 * Forces posted writes to complete on the OCP thread handling
2807 omap_hwmod_read(oh
, oh
->class->sysc
->sysc_offs
);
2811 * omap_hwmod_reset - reset the hwmod
2812 * @oh: struct omap_hwmod *
2814 * Under some conditions, a driver may wish to reset the entire device.
2815 * Called from omap_device code. Returns -EINVAL on error or passes along
2816 * the return value from _reset().
2818 int omap_hwmod_reset(struct omap_hwmod
*oh
)
2821 unsigned long flags
;
2826 spin_lock_irqsave(&oh
->_lock
, flags
);
2828 spin_unlock_irqrestore(&oh
->_lock
, flags
);
2834 * IP block data retrieval functions
2838 * omap_hwmod_count_resources - count number of struct resources needed by hwmod
2839 * @oh: struct omap_hwmod *
2840 * @res: pointer to the first element of an array of struct resource to fill
2842 * Count the number of struct resource array elements necessary to
2843 * contain omap_hwmod @oh resources. Intended to be called by code
2844 * that registers omap_devices. Intended to be used to determine the
2845 * size of a dynamically-allocated struct resource array, before
2846 * calling omap_hwmod_fill_resources(). Returns the number of struct
2847 * resource array elements needed.
2849 * XXX This code is not optimized. It could attempt to merge adjacent
2853 int omap_hwmod_count_resources(struct omap_hwmod
*oh
)
2855 struct omap_hwmod_ocp_if
*os
;
2856 struct list_head
*p
;
2860 ret
= _count_mpu_irqs(oh
) + _count_sdma_reqs(oh
);
2862 p
= oh
->slave_ports
.next
;
2864 while (i
< oh
->slaves_cnt
) {
2865 os
= _fetch_next_ocp_if(&p
, &i
);
2866 ret
+= _count_ocp_if_addr_spaces(os
);
2873 * omap_hwmod_fill_resources - fill struct resource array with hwmod data
2874 * @oh: struct omap_hwmod *
2875 * @res: pointer to the first element of an array of struct resource to fill
2877 * Fill the struct resource array @res with resource data from the
2878 * omap_hwmod @oh. Intended to be called by code that registers
2879 * omap_devices. See also omap_hwmod_count_resources(). Returns the
2880 * number of array elements filled.
2882 int omap_hwmod_fill_resources(struct omap_hwmod
*oh
, struct resource
*res
)
2884 struct omap_hwmod_ocp_if
*os
;
2885 struct list_head
*p
;
2886 int i
, j
, mpu_irqs_cnt
, sdma_reqs_cnt
, addr_cnt
;
2889 /* For each IRQ, DMA, memory area, fill in array.*/
2891 mpu_irqs_cnt
= _count_mpu_irqs(oh
);
2892 for (i
= 0; i
< mpu_irqs_cnt
; i
++) {
2893 (res
+ r
)->name
= (oh
->mpu_irqs
+ i
)->name
;
2894 (res
+ r
)->start
= (oh
->mpu_irqs
+ i
)->irq
;
2895 (res
+ r
)->end
= (oh
->mpu_irqs
+ i
)->irq
;
2896 (res
+ r
)->flags
= IORESOURCE_IRQ
;
2900 sdma_reqs_cnt
= _count_sdma_reqs(oh
);
2901 for (i
= 0; i
< sdma_reqs_cnt
; i
++) {
2902 (res
+ r
)->name
= (oh
->sdma_reqs
+ i
)->name
;
2903 (res
+ r
)->start
= (oh
->sdma_reqs
+ i
)->dma_req
;
2904 (res
+ r
)->end
= (oh
->sdma_reqs
+ i
)->dma_req
;
2905 (res
+ r
)->flags
= IORESOURCE_DMA
;
2909 p
= oh
->slave_ports
.next
;
2912 while (i
< oh
->slaves_cnt
) {
2913 os
= _fetch_next_ocp_if(&p
, &i
);
2914 addr_cnt
= _count_ocp_if_addr_spaces(os
);
2916 for (j
= 0; j
< addr_cnt
; j
++) {
2917 (res
+ r
)->name
= (os
->addr
+ j
)->name
;
2918 (res
+ r
)->start
= (os
->addr
+ j
)->pa_start
;
2919 (res
+ r
)->end
= (os
->addr
+ j
)->pa_end
;
2920 (res
+ r
)->flags
= IORESOURCE_MEM
;
2929 * omap_hwmod_get_resource_byname - fetch IP block integration data by name
2930 * @oh: struct omap_hwmod * to operate on
2931 * @type: one of the IORESOURCE_* constants from include/linux/ioport.h
2932 * @name: pointer to the name of the data to fetch (optional)
2933 * @rsrc: pointer to a struct resource, allocated by the caller
2935 * Retrieve MPU IRQ, SDMA request line, or address space start/end
2936 * data for the IP block pointed to by @oh. The data will be filled
2937 * into a struct resource record pointed to by @rsrc. The struct
2938 * resource must be allocated by the caller. When @name is non-null,
2939 * the data associated with the matching entry in the IRQ/SDMA/address
2940 * space hwmod data arrays will be returned. If @name is null, the
2941 * first array entry will be returned. Data order is not meaningful
2942 * in hwmod data, so callers are strongly encouraged to use a non-null
2943 * @name whenever possible to avoid unpredictable effects if hwmod
2944 * data is later added that causes data ordering to change. This
2945 * function is only intended for use by OMAP core code. Device
2946 * drivers should not call this function - the appropriate bus-related
2947 * data accessor functions should be used instead. Returns 0 upon
2948 * success or a negative error code upon error.
2950 int omap_hwmod_get_resource_byname(struct omap_hwmod
*oh
, unsigned int type
,
2951 const char *name
, struct resource
*rsrc
)
2954 unsigned int irq
, dma
;
2955 u32 pa_start
, pa_end
;
2960 if (type
== IORESOURCE_IRQ
) {
2961 r
= _get_mpu_irq_by_name(oh
, name
, &irq
);
2967 } else if (type
== IORESOURCE_DMA
) {
2968 r
= _get_sdma_req_by_name(oh
, name
, &dma
);
2974 } else if (type
== IORESOURCE_MEM
) {
2975 r
= _get_addr_space_by_name(oh
, name
, &pa_start
, &pa_end
);
2979 rsrc
->start
= pa_start
;
2992 * omap_hwmod_get_pwrdm - return pointer to this module's main powerdomain
2993 * @oh: struct omap_hwmod *
2995 * Return the powerdomain pointer associated with the OMAP module
2996 * @oh's main clock. If @oh does not have a main clk, return the
2997 * powerdomain associated with the interface clock associated with the
2998 * module's MPU port. (XXX Perhaps this should use the SDMA port
2999 * instead?) Returns NULL on error, or a struct powerdomain * on
3002 struct powerdomain
*omap_hwmod_get_pwrdm(struct omap_hwmod
*oh
)
3005 struct omap_hwmod_ocp_if
*oi
;
3013 oi
= _find_mpu_rt_port(oh
);
3022 return c
->clkdm
->pwrdm
.ptr
;
3027 * omap_hwmod_get_mpu_rt_va - return the module's base address (for the MPU)
3028 * @oh: struct omap_hwmod *
3030 * Returns the virtual address corresponding to the beginning of the
3031 * module's register target, in the address range that is intended to
3032 * be used by the MPU. Returns the virtual address upon success or NULL
3035 void __iomem
*omap_hwmod_get_mpu_rt_va(struct omap_hwmod
*oh
)
3040 if (oh
->_int_flags
& _HWMOD_NO_MPU_PORT
)
3043 if (oh
->_state
== _HWMOD_STATE_UNKNOWN
)
3046 return oh
->_mpu_rt_va
;
3050 * omap_hwmod_add_initiator_dep - add sleepdep from @init_oh to @oh
3051 * @oh: struct omap_hwmod *
3052 * @init_oh: struct omap_hwmod * (initiator)
3054 * Add a sleep dependency between the initiator @init_oh and @oh.
3055 * Intended to be called by DSP/Bridge code via platform_data for the
3056 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3057 * code needs to add/del initiator dependencies dynamically
3058 * before/after accessing a device. Returns the return value from
3059 * _add_initiator_dep().
3061 * XXX Keep a usecount in the clockdomain code
3063 int omap_hwmod_add_initiator_dep(struct omap_hwmod
*oh
,
3064 struct omap_hwmod
*init_oh
)
3066 return _add_initiator_dep(oh
, init_oh
);
3070 * XXX what about functions for drivers to save/restore ocp_sysconfig
3071 * for context save/restore operations?
3075 * omap_hwmod_del_initiator_dep - remove sleepdep from @init_oh to @oh
3076 * @oh: struct omap_hwmod *
3077 * @init_oh: struct omap_hwmod * (initiator)
3079 * Remove a sleep dependency between the initiator @init_oh and @oh.
3080 * Intended to be called by DSP/Bridge code via platform_data for the
3081 * DSP case; and by the DMA code in the sDMA case. DMA code, *Bridge
3082 * code needs to add/del initiator dependencies dynamically
3083 * before/after accessing a device. Returns the return value from
3084 * _del_initiator_dep().
3086 * XXX Keep a usecount in the clockdomain code
3088 int omap_hwmod_del_initiator_dep(struct omap_hwmod
*oh
,
3089 struct omap_hwmod
*init_oh
)
3091 return _del_initiator_dep(oh
, init_oh
);
3095 * omap_hwmod_enable_wakeup - allow device to wake up the system
3096 * @oh: struct omap_hwmod *
3098 * Sets the module OCP socket ENAWAKEUP bit to allow the module to
3099 * send wakeups to the PRCM, and enable I/O ring wakeup events for
3100 * this IP block if it has dynamic mux entries. Eventually this
3101 * should set PRCM wakeup registers to cause the PRCM to receive
3102 * wakeup events from the module. Does not set any wakeup routing
3103 * registers beyond this point - if the module is to wake up any other
3104 * module or subsystem, that must be set separately. Called by
3105 * omap_device code. Returns -EINVAL on error or 0 upon success.
3107 int omap_hwmod_enable_wakeup(struct omap_hwmod
*oh
)
3109 unsigned long flags
;
3112 spin_lock_irqsave(&oh
->_lock
, flags
);
3114 if (oh
->class->sysc
&&
3115 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3116 v
= oh
->_sysc_cache
;
3117 _enable_wakeup(oh
, &v
);
3118 _write_sysconfig(v
, oh
);
3121 _set_idle_ioring_wakeup(oh
, true);
3122 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3128 * omap_hwmod_disable_wakeup - prevent device from waking the system
3129 * @oh: struct omap_hwmod *
3131 * Clears the module OCP socket ENAWAKEUP bit to prevent the module
3132 * from sending wakeups to the PRCM, and disable I/O ring wakeup
3133 * events for this IP block if it has dynamic mux entries. Eventually
3134 * this should clear PRCM wakeup registers to cause the PRCM to ignore
3135 * wakeup events from the module. Does not set any wakeup routing
3136 * registers beyond this point - if the module is to wake up any other
3137 * module or subsystem, that must be set separately. Called by
3138 * omap_device code. Returns -EINVAL on error or 0 upon success.
3140 int omap_hwmod_disable_wakeup(struct omap_hwmod
*oh
)
3142 unsigned long flags
;
3145 spin_lock_irqsave(&oh
->_lock
, flags
);
3147 if (oh
->class->sysc
&&
3148 (oh
->class->sysc
->sysc_flags
& SYSC_HAS_ENAWAKEUP
)) {
3149 v
= oh
->_sysc_cache
;
3150 _disable_wakeup(oh
, &v
);
3151 _write_sysconfig(v
, oh
);
3154 _set_idle_ioring_wakeup(oh
, false);
3155 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3161 * omap_hwmod_assert_hardreset - assert the HW reset line of submodules
3162 * contained in the hwmod module.
3163 * @oh: struct omap_hwmod *
3164 * @name: name of the reset line to lookup and assert
3166 * Some IP like dsp, ipu or iva contain processor that require
3167 * an HW reset line to be assert / deassert in order to enable fully
3168 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3169 * yet supported on this OMAP; otherwise, passes along the return value
3170 * from _assert_hardreset().
3172 int omap_hwmod_assert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3175 unsigned long flags
;
3180 spin_lock_irqsave(&oh
->_lock
, flags
);
3181 ret
= _assert_hardreset(oh
, name
);
3182 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3188 * omap_hwmod_deassert_hardreset - deassert the HW reset line of submodules
3189 * contained in the hwmod module.
3190 * @oh: struct omap_hwmod *
3191 * @name: name of the reset line to look up and deassert
3193 * Some IP like dsp, ipu or iva contain processor that require
3194 * an HW reset line to be assert / deassert in order to enable fully
3195 * the IP. Returns -EINVAL if @oh is null or if the operation is not
3196 * yet supported on this OMAP; otherwise, passes along the return value
3197 * from _deassert_hardreset().
3199 int omap_hwmod_deassert_hardreset(struct omap_hwmod
*oh
, const char *name
)
3202 unsigned long flags
;
3207 spin_lock_irqsave(&oh
->_lock
, flags
);
3208 ret
= _deassert_hardreset(oh
, name
);
3209 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3215 * omap_hwmod_read_hardreset - read the HW reset line state of submodules
3216 * contained in the hwmod module
3217 * @oh: struct omap_hwmod *
3218 * @name: name of the reset line to look up and read
3220 * Return the current state of the hwmod @oh's reset line named @name:
3221 * returns -EINVAL upon parameter error or if this operation
3222 * is unsupported on the current OMAP; otherwise, passes along the return
3223 * value from _read_hardreset().
3225 int omap_hwmod_read_hardreset(struct omap_hwmod
*oh
, const char *name
)
3228 unsigned long flags
;
3233 spin_lock_irqsave(&oh
->_lock
, flags
);
3234 ret
= _read_hardreset(oh
, name
);
3235 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3242 * omap_hwmod_for_each_by_class - call @fn for each hwmod of class @classname
3243 * @classname: struct omap_hwmod_class name to search for
3244 * @fn: callback function pointer to call for each hwmod in class @classname
3245 * @user: arbitrary context data to pass to the callback function
3247 * For each omap_hwmod of class @classname, call @fn.
3248 * If the callback function returns something other than
3249 * zero, the iterator is terminated, and the callback function's return
3250 * value is passed back to the caller. Returns 0 upon success, -EINVAL
3251 * if @classname or @fn are NULL, or passes back the error code from @fn.
3253 int omap_hwmod_for_each_by_class(const char *classname
,
3254 int (*fn
)(struct omap_hwmod
*oh
,
3258 struct omap_hwmod
*temp_oh
;
3261 if (!classname
|| !fn
)
3264 pr_debug("omap_hwmod: %s: looking for modules of class %s\n",
3265 __func__
, classname
);
3267 list_for_each_entry(temp_oh
, &omap_hwmod_list
, node
) {
3268 if (!strcmp(temp_oh
->class->name
, classname
)) {
3269 pr_debug("omap_hwmod: %s: %s: calling callback fn\n",
3270 __func__
, temp_oh
->name
);
3271 ret
= (*fn
)(temp_oh
, user
);
3278 pr_debug("omap_hwmod: %s: iterator terminated early: %d\n",
3285 * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod
3286 * @oh: struct omap_hwmod *
3287 * @state: state that _setup() should leave the hwmod in
3289 * Sets the hwmod state that @oh will enter at the end of _setup()
3290 * (called by omap_hwmod_setup_*()). See also the documentation
3291 * for _setup_postsetup(), above. Returns 0 upon success or
3292 * -EINVAL if there is a problem with the arguments or if the hwmod is
3293 * in the wrong state.
3295 int omap_hwmod_set_postsetup_state(struct omap_hwmod
*oh
, u8 state
)
3298 unsigned long flags
;
3303 if (state
!= _HWMOD_STATE_DISABLED
&&
3304 state
!= _HWMOD_STATE_ENABLED
&&
3305 state
!= _HWMOD_STATE_IDLE
)
3308 spin_lock_irqsave(&oh
->_lock
, flags
);
3310 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
3315 oh
->_postsetup_state
= state
;
3319 spin_unlock_irqrestore(&oh
->_lock
, flags
);
3325 * omap_hwmod_get_context_loss_count - get lost context count
3326 * @oh: struct omap_hwmod *
3328 * Query the powerdomain of of @oh to get the context loss
3329 * count for this device.
3331 * Returns the context loss count of the powerdomain assocated with @oh
3332 * upon success, or zero if no powerdomain exists for @oh.
3334 int omap_hwmod_get_context_loss_count(struct omap_hwmod
*oh
)
3336 struct powerdomain
*pwrdm
;
3339 pwrdm
= omap_hwmod_get_pwrdm(oh
);
3341 ret
= pwrdm_get_context_loss_count(pwrdm
);
3347 * omap_hwmod_no_setup_reset - prevent a hwmod from being reset upon setup
3348 * @oh: struct omap_hwmod *
3350 * Prevent the hwmod @oh from being reset during the setup process.
3351 * Intended for use by board-*.c files on boards with devices that
3352 * cannot tolerate being reset. Must be called before the hwmod has
3353 * been set up. Returns 0 upon success or negative error code upon
3356 int omap_hwmod_no_setup_reset(struct omap_hwmod
*oh
)
3361 if (oh
->_state
!= _HWMOD_STATE_REGISTERED
) {
3362 pr_err("omap_hwmod: %s: cannot prevent setup reset; in wrong state\n",
3367 oh
->flags
|= HWMOD_INIT_NO_RESET
;
3373 * omap_hwmod_pad_route_irq - route an I/O pad wakeup to a particular MPU IRQ
3374 * @oh: struct omap_hwmod * containing hwmod mux entries
3375 * @pad_idx: array index in oh->mux of the hwmod mux entry to route wakeup
3376 * @irq_idx: the hwmod mpu_irqs array index of the IRQ to trigger on wakeup
3378 * When an I/O pad wakeup arrives for the dynamic or wakeup hwmod mux
3379 * entry number @pad_idx for the hwmod @oh, trigger the interrupt
3380 * service routine for the hwmod's mpu_irqs array index @irq_idx. If
3381 * this function is not called for a given pad_idx, then the ISR
3382 * associated with @oh's first MPU IRQ will be triggered when an I/O
3383 * pad wakeup occurs on that pad. Note that @pad_idx is the index of
3384 * the _dynamic or wakeup_ entry: if there are other entries not
3385 * marked with OMAP_DEVICE_PAD_WAKEUP or OMAP_DEVICE_PAD_REMUX, these
3386 * entries are NOT COUNTED in the dynamic pad index. This function
3387 * must be called separately for each pad that requires its interrupt
3388 * to be re-routed this way. Returns -EINVAL if there is an argument
3389 * problem or if @oh does not have hwmod mux entries or MPU IRQs;
3390 * returns -ENOMEM if memory cannot be allocated; or 0 upon success.
3392 * XXX This function interface is fragile. Rather than using array
3393 * indexes, which are subject to unpredictable change, it should be
3394 * using hwmod IRQ names, and some other stable key for the hwmod mux
3397 int omap_hwmod_pad_route_irq(struct omap_hwmod
*oh
, int pad_idx
, int irq_idx
)
3403 if (!oh
|| !oh
->mux
|| !oh
->mpu_irqs
|| pad_idx
< 0 ||
3404 pad_idx
>= oh
->mux
->nr_pads_dynamic
)
3407 /* Check the number of available mpu_irqs */
3408 for (nr_irqs
= 0; oh
->mpu_irqs
[nr_irqs
].irq
>= 0; nr_irqs
++)
3411 if (irq_idx
>= nr_irqs
)
3414 if (!oh
->mux
->irqs
) {
3415 /* XXX What frees this? */
3416 oh
->mux
->irqs
= kzalloc(sizeof(int) * oh
->mux
->nr_pads_dynamic
,
3421 oh
->mux
->irqs
[pad_idx
] = irq_idx
;
3427 * omap_hwmod_init - initialize the hwmod code
3429 * Sets up some function pointers needed by the hwmod code to operate on the
3430 * currently-booted SoC. Intended to be called once during kernel init
3431 * before any hwmods are registered. No return value.
3433 void __init
omap_hwmod_init(void)
3435 if (cpu_is_omap44xx()) {
3436 soc_ops
.enable_module
= _omap4_enable_module
;
3437 soc_ops
.disable_module
= _omap4_disable_module
;