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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * linux/arch/arm/plat-omap/dmtimer.c
4 *
5 * OMAP Dual-Mode Timers
6 *
7 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/
8 * Tarun Kanti DebBarma <tarun.kanti@ti.com>
9 * Thara Gopinath <thara@ti.com>
10 *
11 * dmtimer adaptation to platform_driver.
12 *
13 * Copyright (C) 2005 Nokia Corporation
14 * OMAP2 support by Juha Yrjola
15 * API improvements and OMAP2 clock framework support by Timo Teras
16 *
17 * Copyright (C) 2009 Texas Instruments
18 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
19 */
20
21#include <linux/clk.h>
22#include <linux/clk-provider.h>
23#include <linux/cpu_pm.h>
24#include <linux/module.h>
25#include <linux/io.h>
26#include <linux/device.h>
27#include <linux/err.h>
28#include <linux/pm_runtime.h>
29#include <linux/of.h>
30#include <linux/of_device.h>
31#include <linux/platform_device.h>
32#include <linux/platform_data/dmtimer-omap.h>
33
34#include <clocksource/timer-ti-dm.h>
35
36/*
37 * timer errata flags
38 *
39 * Errata i103/i767 impacts all OMAP3/4/5 devices including AM33xx. This
40 * errata prevents us from using posted mode on these devices, unless the
41 * timer counter register is never read. For more details please refer to
42 * the OMAP3/4/5 errata documents.
43 */
44#define OMAP_TIMER_ERRATA_I103_I767 0x80000000
45
46/* posted mode types */
47#define OMAP_TIMER_NONPOSTED 0x00
48#define OMAP_TIMER_POSTED 0x01
49
50/* register offsets with the write pending bit encoded */
51#define WPSHIFT 16
52
53#define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \
54 | (WP_NONE << WPSHIFT))
55
56#define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \
57 | (WP_TCLR << WPSHIFT))
58
59#define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \
60 | (WP_TCRR << WPSHIFT))
61
62#define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \
63 | (WP_TLDR << WPSHIFT))
64
65#define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \
66 | (WP_TTGR << WPSHIFT))
67
68#define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \
69 | (WP_NONE << WPSHIFT))
70
71#define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \
72 | (WP_TMAR << WPSHIFT))
73
74#define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \
75 | (WP_NONE << WPSHIFT))
76
77#define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \
78 | (WP_NONE << WPSHIFT))
79
80#define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \
81 | (WP_NONE << WPSHIFT))
82
83#define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \
84 | (WP_TPIR << WPSHIFT))
85
86#define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \
87 | (WP_TNIR << WPSHIFT))
88
89#define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \
90 | (WP_TCVR << WPSHIFT))
91
92#define OMAP_TIMER_TICK_INT_MASK_SET_REG \
93 (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
94
95#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \
96 (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
97
98struct timer_regs {
99 u32 ocp_cfg;
100 u32 tidr;
101 u32 tier;
102 u32 twer;
103 u32 tclr;
104 u32 tcrr;
105 u32 tldr;
106 u32 ttrg;
107 u32 twps;
108 u32 tmar;
109 u32 tcar1;
110 u32 tsicr;
111 u32 tcar2;
112 u32 tpir;
113 u32 tnir;
114 u32 tcvr;
115 u32 tocr;
116 u32 towr;
117};
118
119struct dmtimer {
120 struct omap_dm_timer cookie;
121 int id;
122 int irq;
123 struct clk *fclk;
124
125 void __iomem *io_base;
126 int irq_stat; /* TISR/IRQSTATUS interrupt status */
127 int irq_ena; /* irq enable */
128 int irq_dis; /* irq disable, only on v2 ip */
129 void __iomem *pend; /* write pending */
130 void __iomem *func_base; /* function register base */
131
132 atomic_t enabled;
133 unsigned long rate;
134 unsigned reserved:1;
135 unsigned posted:1;
136 unsigned omap1:1;
137 struct timer_regs context;
138 int revision;
139 u32 capability;
140 u32 errata;
141 struct platform_device *pdev;
142 struct list_head node;
143 struct notifier_block nb;
144};
145
146static u32 omap_reserved_systimers;
147static LIST_HEAD(omap_timer_list);
148static DEFINE_SPINLOCK(dm_timer_lock);
149
150enum {
151 REQUEST_ANY = 0,
152 REQUEST_BY_ID,
153 REQUEST_BY_CAP,
154 REQUEST_BY_NODE,
155};
156
157/**
158 * dmtimer_read - read timer registers in posted and non-posted mode
159 * @timer: timer pointer over which read operation to perform
160 * @reg: lowest byte holds the register offset
161 *
162 * The posted mode bit is encoded in reg. Note that in posted mode, write
163 * pending bit must be checked. Otherwise a read of a non completed write
164 * will produce an error.
165 */
166static inline u32 dmtimer_read(struct dmtimer *timer, u32 reg)
167{
168 u16 wp, offset;
169
170 wp = reg >> WPSHIFT;
171 offset = reg & 0xff;
172
173 /* Wait for a possible write pending bit in posted mode */
174 if (wp && timer->posted)
175 while (readl_relaxed(timer->pend) & wp)
176 cpu_relax();
177
178 return readl_relaxed(timer->func_base + offset);
179}
180
181/**
182 * dmtimer_write - write timer registers in posted and non-posted mode
183 * @timer: timer pointer over which write operation is to perform
184 * @reg: lowest byte holds the register offset
185 * @value: data to write into the register
186 *
187 * The posted mode bit is encoded in reg. Note that in posted mode, the write
188 * pending bit must be checked. Otherwise a write on a register which has a
189 * pending write will be lost.
190 */
191static inline void dmtimer_write(struct dmtimer *timer, u32 reg, u32 val)
192{
193 u16 wp, offset;
194
195 wp = reg >> WPSHIFT;
196 offset = reg & 0xff;
197
198 /* Wait for a possible write pending bit in posted mode */
199 if (wp && timer->posted)
200 while (readl_relaxed(timer->pend) & wp)
201 cpu_relax();
202
203 writel_relaxed(val, timer->func_base + offset);
204}
205
206static inline void __omap_dm_timer_init_regs(struct dmtimer *timer)
207{
208 u32 tidr;
209
210 /* Assume v1 ip if bits [31:16] are zero */
211 tidr = readl_relaxed(timer->io_base);
212 if (!(tidr >> 16)) {
213 timer->revision = 1;
214 timer->irq_stat = OMAP_TIMER_V1_STAT_OFFSET;
215 timer->irq_ena = OMAP_TIMER_V1_INT_EN_OFFSET;
216 timer->irq_dis = OMAP_TIMER_V1_INT_EN_OFFSET;
217 timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
218 timer->func_base = timer->io_base;
219 } else {
220 timer->revision = 2;
221 timer->irq_stat = OMAP_TIMER_V2_IRQSTATUS - OMAP_TIMER_V2_FUNC_OFFSET;
222 timer->irq_ena = OMAP_TIMER_V2_IRQENABLE_SET - OMAP_TIMER_V2_FUNC_OFFSET;
223 timer->irq_dis = OMAP_TIMER_V2_IRQENABLE_CLR - OMAP_TIMER_V2_FUNC_OFFSET;
224 timer->pend = timer->io_base +
225 _OMAP_TIMER_WRITE_PEND_OFFSET +
226 OMAP_TIMER_V2_FUNC_OFFSET;
227 timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
228 }
229}
230
231/*
232 * __omap_dm_timer_enable_posted - enables write posted mode
233 * @timer: pointer to timer instance handle
234 *
235 * Enables the write posted mode for the timer. When posted mode is enabled
236 * writes to certain timer registers are immediately acknowledged by the
237 * internal bus and hence prevents stalling the CPU waiting for the write to
238 * complete. Enabling this feature can improve performance for writing to the
239 * timer registers.
240 */
241static inline void __omap_dm_timer_enable_posted(struct dmtimer *timer)
242{
243 if (timer->posted)
244 return;
245
246 if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
247 timer->posted = OMAP_TIMER_NONPOSTED;
248 dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0);
249 return;
250 }
251
252 dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, OMAP_TIMER_CTRL_POSTED);
253 timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
254 timer->posted = OMAP_TIMER_POSTED;
255}
256
257static inline void __omap_dm_timer_stop(struct dmtimer *timer,
258 unsigned long rate)
259{
260 u32 l;
261
262 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
263 if (l & OMAP_TIMER_CTRL_ST) {
264 l &= ~0x1;
265 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l);
266#ifdef CONFIG_ARCH_OMAP2PLUS
267 /* Readback to make sure write has completed */
268 dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
269 /*
270 * Wait for functional clock period x 3.5 to make sure that
271 * timer is stopped
272 */
273 udelay(3500000 / rate + 1);
274#endif
275 }
276
277 /* Ack possibly pending interrupt */
278 dmtimer_write(timer, timer->irq_stat, OMAP_TIMER_INT_OVERFLOW);
279}
280
281static inline void __omap_dm_timer_int_enable(struct dmtimer *timer,
282 unsigned int value)
283{
284 dmtimer_write(timer, timer->irq_ena, value);
285 dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
286}
287
288static inline unsigned int
289__omap_dm_timer_read_counter(struct dmtimer *timer)
290{
291 return dmtimer_read(timer, OMAP_TIMER_COUNTER_REG);
292}
293
294static inline void __omap_dm_timer_write_status(struct dmtimer *timer,
295 unsigned int value)
296{
297 dmtimer_write(timer, timer->irq_stat, value);
298}
299
300static void omap_timer_restore_context(struct dmtimer *timer)
301{
302 dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, timer->context.ocp_cfg);
303
304 dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, timer->context.twer);
305 dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, timer->context.tcrr);
306 dmtimer_write(timer, OMAP_TIMER_LOAD_REG, timer->context.tldr);
307 dmtimer_write(timer, OMAP_TIMER_MATCH_REG, timer->context.tmar);
308 dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, timer->context.tsicr);
309 dmtimer_write(timer, timer->irq_ena, timer->context.tier);
310 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, timer->context.tclr);
311}
312
313static void omap_timer_save_context(struct dmtimer *timer)
314{
315 timer->context.ocp_cfg = dmtimer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET);
316
317 timer->context.tclr = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
318 timer->context.twer = dmtimer_read(timer, OMAP_TIMER_WAKEUP_EN_REG);
319 timer->context.tldr = dmtimer_read(timer, OMAP_TIMER_LOAD_REG);
320 timer->context.tmar = dmtimer_read(timer, OMAP_TIMER_MATCH_REG);
321 timer->context.tier = dmtimer_read(timer, timer->irq_ena);
322 timer->context.tsicr = dmtimer_read(timer, OMAP_TIMER_IF_CTRL_REG);
323}
324
325static int omap_timer_context_notifier(struct notifier_block *nb,
326 unsigned long cmd, void *v)
327{
328 struct dmtimer *timer;
329
330 timer = container_of(nb, struct dmtimer, nb);
331
332 switch (cmd) {
333 case CPU_CLUSTER_PM_ENTER:
334 if ((timer->capability & OMAP_TIMER_ALWON) ||
335 !atomic_read(&timer->enabled))
336 break;
337 omap_timer_save_context(timer);
338 break;
339 case CPU_CLUSTER_PM_ENTER_FAILED: /* No need to restore context */
340 break;
341 case CPU_CLUSTER_PM_EXIT:
342 if ((timer->capability & OMAP_TIMER_ALWON) ||
343 !atomic_read(&timer->enabled))
344 break;
345 omap_timer_restore_context(timer);
346 break;
347 }
348
349 return NOTIFY_OK;
350}
351
352static int omap_dm_timer_reset(struct dmtimer *timer)
353{
354 u32 l, timeout = 100000;
355
356 if (timer->revision != 1)
357 return -EINVAL;
358
359 dmtimer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
360
361 do {
362 l = dmtimer_read(timer, OMAP_TIMER_V1_SYS_STAT_OFFSET);
363 } while (!l && timeout--);
364
365 if (!timeout) {
366 dev_err(&timer->pdev->dev, "Timer failed to reset\n");
367 return -ETIMEDOUT;
368 }
369
370 /* Configure timer for smart-idle mode */
371 l = dmtimer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET);
372 l |= 0x2 << 0x3;
373 dmtimer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l);
374
375 timer->posted = 0;
376
377 return 0;
378}
379
380/*
381 * Functions exposed to PWM and remoteproc drivers via platform_data.
382 * Do not use these in the driver, these will get deprecated and will
383 * will be replaced by Linux generic framework functions such as
384 * chained interrupts and clock framework.
385 */
386static struct dmtimer *to_dmtimer(struct omap_dm_timer *cookie)
387{
388 if (!cookie)
389 return NULL;
390
391 return container_of(cookie, struct dmtimer, cookie);
392}
393
394static int omap_dm_timer_set_source(struct omap_dm_timer *cookie, int source)
395{
396 int ret;
397 const char *parent_name;
398 struct clk *parent;
399 struct dmtimer_platform_data *pdata;
400 struct dmtimer *timer;
401
402 timer = to_dmtimer(cookie);
403 if (unlikely(!timer) || IS_ERR(timer->fclk))
404 return -EINVAL;
405
406 switch (source) {
407 case OMAP_TIMER_SRC_SYS_CLK:
408 parent_name = "timer_sys_ck";
409 break;
410 case OMAP_TIMER_SRC_32_KHZ:
411 parent_name = "timer_32k_ck";
412 break;
413 case OMAP_TIMER_SRC_EXT_CLK:
414 parent_name = "timer_ext_ck";
415 break;
416 default:
417 return -EINVAL;
418 }
419
420 pdata = timer->pdev->dev.platform_data;
421
422 /*
423 * FIXME: Used for OMAP1 devices only because they do not currently
424 * use the clock framework to set the parent clock. To be removed
425 * once OMAP1 migrated to using clock framework for dmtimers
426 */
427 if (timer->omap1 && pdata && pdata->set_timer_src)
428 return pdata->set_timer_src(timer->pdev, source);
429
430#if defined(CONFIG_COMMON_CLK)
431 /* Check if the clock has configurable parents */
432 if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
433 return 0;
434#endif
435
436 parent = clk_get(&timer->pdev->dev, parent_name);
437 if (IS_ERR(parent)) {
438 pr_err("%s: %s not found\n", __func__, parent_name);
439 return -EINVAL;
440 }
441
442 ret = clk_set_parent(timer->fclk, parent);
443 if (ret < 0)
444 pr_err("%s: failed to set %s as parent\n", __func__,
445 parent_name);
446
447 clk_put(parent);
448
449 return ret;
450}
451
452static void omap_dm_timer_enable(struct omap_dm_timer *cookie)
453{
454 struct dmtimer *timer = to_dmtimer(cookie);
455 struct device *dev = &timer->pdev->dev;
456 int rc;
457
458 rc = pm_runtime_resume_and_get(dev);
459 if (rc)
460 dev_err(dev, "could not enable timer\n");
461}
462
463static void omap_dm_timer_disable(struct omap_dm_timer *cookie)
464{
465 struct dmtimer *timer = to_dmtimer(cookie);
466 struct device *dev = &timer->pdev->dev;
467
468 pm_runtime_put_sync(dev);
469}
470
471static int omap_dm_timer_prepare(struct dmtimer *timer)
472{
473 struct device *dev = &timer->pdev->dev;
474 int rc;
475
476 rc = pm_runtime_resume_and_get(dev);
477 if (rc)
478 return rc;
479
480 if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
481 rc = omap_dm_timer_reset(timer);
482 if (rc) {
483 pm_runtime_put_sync(dev);
484 return rc;
485 }
486 }
487
488 __omap_dm_timer_enable_posted(timer);
489 pm_runtime_put_sync(dev);
490
491 return 0;
492}
493
494static inline u32 omap_dm_timer_reserved_systimer(int id)
495{
496 return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
497}
498
499static struct dmtimer *_omap_dm_timer_request(int req_type, void *data)
500{
501 struct dmtimer *timer = NULL, *t;
502 struct device_node *np = NULL;
503 unsigned long flags;
504 u32 cap = 0;
505 int id = 0;
506
507 switch (req_type) {
508 case REQUEST_BY_ID:
509 id = *(int *)data;
510 break;
511 case REQUEST_BY_CAP:
512 cap = *(u32 *)data;
513 break;
514 case REQUEST_BY_NODE:
515 np = (struct device_node *)data;
516 break;
517 default:
518 /* REQUEST_ANY */
519 break;
520 }
521
522 spin_lock_irqsave(&dm_timer_lock, flags);
523 list_for_each_entry(t, &omap_timer_list, node) {
524 if (t->reserved)
525 continue;
526
527 switch (req_type) {
528 case REQUEST_BY_ID:
529 if (id == t->pdev->id) {
530 timer = t;
531 timer->reserved = 1;
532 goto found;
533 }
534 break;
535 case REQUEST_BY_CAP:
536 if (cap == (t->capability & cap)) {
537 /*
538 * If timer is not NULL, we have already found
539 * one timer. But it was not an exact match
540 * because it had more capabilities than what
541 * was required. Therefore, unreserve the last
542 * timer found and see if this one is a better
543 * match.
544 */
545 if (timer)
546 timer->reserved = 0;
547 timer = t;
548 timer->reserved = 1;
549
550 /* Exit loop early if we find an exact match */
551 if (t->capability == cap)
552 goto found;
553 }
554 break;
555 case REQUEST_BY_NODE:
556 if (np == t->pdev->dev.of_node) {
557 timer = t;
558 timer->reserved = 1;
559 goto found;
560 }
561 break;
562 default:
563 /* REQUEST_ANY */
564 timer = t;
565 timer->reserved = 1;
566 goto found;
567 }
568 }
569found:
570 spin_unlock_irqrestore(&dm_timer_lock, flags);
571
572 if (timer && omap_dm_timer_prepare(timer)) {
573 timer->reserved = 0;
574 timer = NULL;
575 }
576
577 if (!timer)
578 pr_debug("%s: timer request failed!\n", __func__);
579
580 return timer;
581}
582
583static struct omap_dm_timer *omap_dm_timer_request(void)
584{
585 struct dmtimer *timer;
586
587 timer = _omap_dm_timer_request(REQUEST_ANY, NULL);
588 if (!timer)
589 return NULL;
590
591 return &timer->cookie;
592}
593
594static struct omap_dm_timer *omap_dm_timer_request_specific(int id)
595{
596 struct dmtimer *timer;
597
598 /* Requesting timer by ID is not supported when device tree is used */
599 if (of_have_populated_dt()) {
600 pr_warn("%s: Please use omap_dm_timer_request_by_node()\n",
601 __func__);
602 return NULL;
603 }
604
605 timer = _omap_dm_timer_request(REQUEST_BY_ID, &id);
606 if (!timer)
607 return NULL;
608
609 return &timer->cookie;
610}
611
612/**
613 * omap_dm_timer_request_by_node - Request a timer by device-tree node
614 * @np: Pointer to device-tree timer node
615 *
616 * Request a timer based upon a device node pointer. Returns pointer to
617 * timer handle on success and a NULL pointer on failure.
618 */
619static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
620{
621 struct dmtimer *timer;
622
623 if (!np)
624 return NULL;
625
626 timer = _omap_dm_timer_request(REQUEST_BY_NODE, np);
627 if (!timer)
628 return NULL;
629
630 return &timer->cookie;
631}
632
633static int omap_dm_timer_free(struct omap_dm_timer *cookie)
634{
635 struct dmtimer *timer;
636 struct device *dev;
637 int rc;
638
639 timer = to_dmtimer(cookie);
640 if (unlikely(!timer))
641 return -EINVAL;
642
643 WARN_ON(!timer->reserved);
644 timer->reserved = 0;
645
646 dev = &timer->pdev->dev;
647 rc = pm_runtime_resume_and_get(dev);
648 if (rc)
649 return rc;
650
651 /* Clear timer configuration */
652 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, 0);
653
654 pm_runtime_put_sync(dev);
655
656 return 0;
657}
658
659static int omap_dm_timer_get_irq(struct omap_dm_timer *cookie)
660{
661 struct dmtimer *timer = to_dmtimer(cookie);
662 if (timer)
663 return timer->irq;
664 return -EINVAL;
665}
666
667#if defined(CONFIG_ARCH_OMAP1)
668#include <linux/soc/ti/omap1-io.h>
669
670static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *cookie)
671{
672 return NULL;
673}
674
675/**
676 * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
677 * @inputmask: current value of idlect mask
678 */
679__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
680{
681 int i = 0;
682 struct dmtimer *timer = NULL;
683 unsigned long flags;
684
685 /* If ARMXOR cannot be idled this function call is unnecessary */
686 if (!(inputmask & (1 << 1)))
687 return inputmask;
688
689 /* If any active timer is using ARMXOR return modified mask */
690 spin_lock_irqsave(&dm_timer_lock, flags);
691 list_for_each_entry(timer, &omap_timer_list, node) {
692 u32 l;
693
694 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
695 if (l & OMAP_TIMER_CTRL_ST) {
696 if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
697 inputmask &= ~(1 << 1);
698 else
699 inputmask &= ~(1 << 2);
700 }
701 i++;
702 }
703 spin_unlock_irqrestore(&dm_timer_lock, flags);
704
705 return inputmask;
706}
707
708#else
709
710static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *cookie)
711{
712 struct dmtimer *timer = to_dmtimer(cookie);
713
714 if (timer && !IS_ERR(timer->fclk))
715 return timer->fclk;
716 return NULL;
717}
718
719__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
720{
721 BUG();
722
723 return 0;
724}
725
726#endif
727
728static int omap_dm_timer_start(struct omap_dm_timer *cookie)
729{
730 struct dmtimer *timer;
731 struct device *dev;
732 int rc;
733 u32 l;
734
735 timer = to_dmtimer(cookie);
736 if (unlikely(!timer))
737 return -EINVAL;
738
739 dev = &timer->pdev->dev;
740
741 rc = pm_runtime_resume_and_get(dev);
742 if (rc)
743 return rc;
744
745 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
746 if (!(l & OMAP_TIMER_CTRL_ST)) {
747 l |= OMAP_TIMER_CTRL_ST;
748 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l);
749 }
750
751 return 0;
752}
753
754static int omap_dm_timer_stop(struct omap_dm_timer *cookie)
755{
756 struct dmtimer *timer;
757 struct device *dev;
758 unsigned long rate = 0;
759
760 timer = to_dmtimer(cookie);
761 if (unlikely(!timer))
762 return -EINVAL;
763
764 dev = &timer->pdev->dev;
765
766 if (!timer->omap1)
767 rate = clk_get_rate(timer->fclk);
768
769 __omap_dm_timer_stop(timer, rate);
770
771 pm_runtime_put_sync(dev);
772
773 return 0;
774}
775
776static int omap_dm_timer_set_load(struct omap_dm_timer *cookie,
777 unsigned int load)
778{
779 struct dmtimer *timer;
780 struct device *dev;
781 int rc;
782
783 timer = to_dmtimer(cookie);
784 if (unlikely(!timer))
785 return -EINVAL;
786
787 dev = &timer->pdev->dev;
788 rc = pm_runtime_resume_and_get(dev);
789 if (rc)
790 return rc;
791
792 dmtimer_write(timer, OMAP_TIMER_LOAD_REG, load);
793
794 pm_runtime_put_sync(dev);
795
796 return 0;
797}
798
799static int omap_dm_timer_set_match(struct omap_dm_timer *cookie, int enable,
800 unsigned int match)
801{
802 struct dmtimer *timer;
803 struct device *dev;
804 int rc;
805 u32 l;
806
807 timer = to_dmtimer(cookie);
808 if (unlikely(!timer))
809 return -EINVAL;
810
811 dev = &timer->pdev->dev;
812 rc = pm_runtime_resume_and_get(dev);
813 if (rc)
814 return rc;
815
816 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
817 if (enable)
818 l |= OMAP_TIMER_CTRL_CE;
819 else
820 l &= ~OMAP_TIMER_CTRL_CE;
821 dmtimer_write(timer, OMAP_TIMER_MATCH_REG, match);
822 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l);
823
824 pm_runtime_put_sync(dev);
825
826 return 0;
827}
828
829static int omap_dm_timer_set_pwm(struct omap_dm_timer *cookie, int def_on,
830 int toggle, int trigger, int autoreload)
831{
832 struct dmtimer *timer;
833 struct device *dev;
834 int rc;
835 u32 l;
836
837 timer = to_dmtimer(cookie);
838 if (unlikely(!timer))
839 return -EINVAL;
840
841 dev = &timer->pdev->dev;
842 rc = pm_runtime_resume_and_get(dev);
843 if (rc)
844 return rc;
845
846 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
847 l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
848 OMAP_TIMER_CTRL_PT | (0x03 << 10) | OMAP_TIMER_CTRL_AR);
849 if (def_on)
850 l |= OMAP_TIMER_CTRL_SCPWM;
851 if (toggle)
852 l |= OMAP_TIMER_CTRL_PT;
853 l |= trigger << 10;
854 if (autoreload)
855 l |= OMAP_TIMER_CTRL_AR;
856 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l);
857
858 pm_runtime_put_sync(dev);
859
860 return 0;
861}
862
863static int omap_dm_timer_get_pwm_status(struct omap_dm_timer *cookie)
864{
865 struct dmtimer *timer;
866 struct device *dev;
867 int rc;
868 u32 l;
869
870 timer = to_dmtimer(cookie);
871 if (unlikely(!timer))
872 return -EINVAL;
873
874 dev = &timer->pdev->dev;
875 rc = pm_runtime_resume_and_get(dev);
876 if (rc)
877 return rc;
878
879 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
880
881 pm_runtime_put_sync(dev);
882
883 return l;
884}
885
886static int omap_dm_timer_set_prescaler(struct omap_dm_timer *cookie,
887 int prescaler)
888{
889 struct dmtimer *timer;
890 struct device *dev;
891 int rc;
892 u32 l;
893
894 timer = to_dmtimer(cookie);
895 if (unlikely(!timer) || prescaler < -1 || prescaler > 7)
896 return -EINVAL;
897
898 dev = &timer->pdev->dev;
899 rc = pm_runtime_resume_and_get(dev);
900 if (rc)
901 return rc;
902
903 l = dmtimer_read(timer, OMAP_TIMER_CTRL_REG);
904 l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
905 if (prescaler >= 0) {
906 l |= OMAP_TIMER_CTRL_PRE;
907 l |= prescaler << 2;
908 }
909 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, l);
910
911 pm_runtime_put_sync(dev);
912
913 return 0;
914}
915
916static int omap_dm_timer_set_int_enable(struct omap_dm_timer *cookie,
917 unsigned int value)
918{
919 struct dmtimer *timer;
920 struct device *dev;
921 int rc;
922
923 timer = to_dmtimer(cookie);
924 if (unlikely(!timer))
925 return -EINVAL;
926
927 dev = &timer->pdev->dev;
928 rc = pm_runtime_resume_and_get(dev);
929 if (rc)
930 return rc;
931
932 __omap_dm_timer_int_enable(timer, value);
933
934 pm_runtime_put_sync(dev);
935
936 return 0;
937}
938
939/**
940 * omap_dm_timer_set_int_disable - disable timer interrupts
941 * @timer: pointer to timer handle
942 * @mask: bit mask of interrupts to be disabled
943 *
944 * Disables the specified timer interrupts for a timer.
945 */
946static int omap_dm_timer_set_int_disable(struct omap_dm_timer *cookie, u32 mask)
947{
948 struct dmtimer *timer;
949 struct device *dev;
950 u32 l = mask;
951 int rc;
952
953 timer = to_dmtimer(cookie);
954 if (unlikely(!timer))
955 return -EINVAL;
956
957 dev = &timer->pdev->dev;
958 rc = pm_runtime_resume_and_get(dev);
959 if (rc)
960 return rc;
961
962 if (timer->revision == 1)
963 l = dmtimer_read(timer, timer->irq_ena) & ~mask;
964
965 dmtimer_write(timer, timer->irq_dis, l);
966 l = dmtimer_read(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
967 dmtimer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
968
969 pm_runtime_put_sync(dev);
970
971 return 0;
972}
973
974static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *cookie)
975{
976 struct dmtimer *timer;
977 unsigned int l;
978
979 timer = to_dmtimer(cookie);
980 if (unlikely(!timer || !atomic_read(&timer->enabled))) {
981 pr_err("%s: timer not available or enabled.\n", __func__);
982 return 0;
983 }
984
985 l = dmtimer_read(timer, timer->irq_stat);
986
987 return l;
988}
989
990static int omap_dm_timer_write_status(struct omap_dm_timer *cookie, unsigned int value)
991{
992 struct dmtimer *timer;
993
994 timer = to_dmtimer(cookie);
995 if (unlikely(!timer || !atomic_read(&timer->enabled)))
996 return -EINVAL;
997
998 __omap_dm_timer_write_status(timer, value);
999
1000 return 0;
1001}
1002
1003static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *cookie)
1004{
1005 struct dmtimer *timer;
1006
1007 timer = to_dmtimer(cookie);
1008 if (unlikely(!timer || !atomic_read(&timer->enabled))) {
1009 pr_err("%s: timer not iavailable or enabled.\n", __func__);
1010 return 0;
1011 }
1012
1013 return __omap_dm_timer_read_counter(timer);
1014}
1015
1016static int omap_dm_timer_write_counter(struct omap_dm_timer *cookie, unsigned int value)
1017{
1018 struct dmtimer *timer;
1019
1020 timer = to_dmtimer(cookie);
1021 if (unlikely(!timer || !atomic_read(&timer->enabled))) {
1022 pr_err("%s: timer not available or enabled.\n", __func__);
1023 return -EINVAL;
1024 }
1025
1026 dmtimer_write(timer, OMAP_TIMER_COUNTER_REG, value);
1027
1028 /* Save the context */
1029 timer->context.tcrr = value;
1030 return 0;
1031}
1032
1033static int __maybe_unused omap_dm_timer_runtime_suspend(struct device *dev)
1034{
1035 struct dmtimer *timer = dev_get_drvdata(dev);
1036
1037 atomic_set(&timer->enabled, 0);
1038
1039 if (timer->capability & OMAP_TIMER_ALWON || !timer->func_base)
1040 return 0;
1041
1042 omap_timer_save_context(timer);
1043
1044 return 0;
1045}
1046
1047static int __maybe_unused omap_dm_timer_runtime_resume(struct device *dev)
1048{
1049 struct dmtimer *timer = dev_get_drvdata(dev);
1050
1051 if (!(timer->capability & OMAP_TIMER_ALWON) && timer->func_base)
1052 omap_timer_restore_context(timer);
1053
1054 atomic_set(&timer->enabled, 1);
1055
1056 return 0;
1057}
1058
1059static const struct dev_pm_ops omap_dm_timer_pm_ops = {
1060 SET_RUNTIME_PM_OPS(omap_dm_timer_runtime_suspend,
1061 omap_dm_timer_runtime_resume, NULL)
1062};
1063
1064static const struct of_device_id omap_timer_match[];
1065
1066/**
1067 * omap_dm_timer_probe - probe function called for every registered device
1068 * @pdev: pointer to current timer platform device
1069 *
1070 * Called by driver framework at the end of device registration for all
1071 * timer devices.
1072 */
1073static int omap_dm_timer_probe(struct platform_device *pdev)
1074{
1075 unsigned long flags;
1076 struct dmtimer *timer;
1077 struct device *dev = &pdev->dev;
1078 const struct dmtimer_platform_data *pdata;
1079 int ret;
1080
1081 pdata = of_device_get_match_data(dev);
1082 if (!pdata)
1083 pdata = dev_get_platdata(dev);
1084 else
1085 dev->platform_data = (void *)pdata;
1086
1087 if (!pdata) {
1088 dev_err(dev, "%s: no platform data.\n", __func__);
1089 return -ENODEV;
1090 }
1091
1092 timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
1093 if (!timer)
1094 return -ENOMEM;
1095
1096 timer->irq = platform_get_irq(pdev, 0);
1097 if (timer->irq < 0)
1098 return timer->irq;
1099
1100 timer->io_base = devm_platform_ioremap_resource(pdev, 0);
1101 if (IS_ERR(timer->io_base))
1102 return PTR_ERR(timer->io_base);
1103
1104 platform_set_drvdata(pdev, timer);
1105
1106 if (dev->of_node) {
1107 if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
1108 timer->capability |= OMAP_TIMER_ALWON;
1109 if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
1110 timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
1111 if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
1112 timer->capability |= OMAP_TIMER_HAS_PWM;
1113 if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
1114 timer->capability |= OMAP_TIMER_SECURE;
1115 } else {
1116 timer->id = pdev->id;
1117 timer->capability = pdata->timer_capability;
1118 timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
1119 }
1120
1121 timer->omap1 = timer->capability & OMAP_TIMER_NEEDS_RESET;
1122
1123 /* OMAP1 devices do not yet use the clock framework for dmtimers */
1124 if (!timer->omap1) {
1125 timer->fclk = devm_clk_get(dev, "fck");
1126 if (IS_ERR(timer->fclk))
1127 return PTR_ERR(timer->fclk);
1128 } else {
1129 timer->fclk = ERR_PTR(-ENODEV);
1130 }
1131
1132 if (!(timer->capability & OMAP_TIMER_ALWON)) {
1133 timer->nb.notifier_call = omap_timer_context_notifier;
1134 cpu_pm_register_notifier(&timer->nb);
1135 }
1136
1137 timer->errata = pdata->timer_errata;
1138
1139 timer->pdev = pdev;
1140
1141 pm_runtime_enable(dev);
1142
1143 if (!timer->reserved) {
1144 ret = pm_runtime_resume_and_get(dev);
1145 if (ret) {
1146 dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
1147 __func__);
1148 goto err_disable;
1149 }
1150 __omap_dm_timer_init_regs(timer);
1151
1152 /* Clear timer configuration */
1153 dmtimer_write(timer, OMAP_TIMER_CTRL_REG, 0);
1154
1155 pm_runtime_put(dev);
1156 }
1157
1158 /* add the timer element to the list */
1159 spin_lock_irqsave(&dm_timer_lock, flags);
1160 list_add_tail(&timer->node, &omap_timer_list);
1161 spin_unlock_irqrestore(&dm_timer_lock, flags);
1162
1163 dev_dbg(dev, "Device Probed.\n");
1164
1165 return 0;
1166
1167err_disable:
1168 pm_runtime_disable(dev);
1169 return ret;
1170}
1171
1172/**
1173 * omap_dm_timer_remove - cleanup a registered timer device
1174 * @pdev: pointer to current timer platform device
1175 *
1176 * Called by driver framework whenever a timer device is unregistered.
1177 * In addition to freeing platform resources it also deletes the timer
1178 * entry from the local list.
1179 */
1180static int omap_dm_timer_remove(struct platform_device *pdev)
1181{
1182 struct dmtimer *timer;
1183 unsigned long flags;
1184 int ret = -EINVAL;
1185
1186 spin_lock_irqsave(&dm_timer_lock, flags);
1187 list_for_each_entry(timer, &omap_timer_list, node)
1188 if (!strcmp(dev_name(&timer->pdev->dev),
1189 dev_name(&pdev->dev))) {
1190 if (!(timer->capability & OMAP_TIMER_ALWON))
1191 cpu_pm_unregister_notifier(&timer->nb);
1192 list_del(&timer->node);
1193 ret = 0;
1194 break;
1195 }
1196 spin_unlock_irqrestore(&dm_timer_lock, flags);
1197
1198 pm_runtime_disable(&pdev->dev);
1199
1200 return ret;
1201}
1202
1203static const struct omap_dm_timer_ops dmtimer_ops = {
1204 .request_by_node = omap_dm_timer_request_by_node,
1205 .request_specific = omap_dm_timer_request_specific,
1206 .request = omap_dm_timer_request,
1207 .set_source = omap_dm_timer_set_source,
1208 .get_irq = omap_dm_timer_get_irq,
1209 .set_int_enable = omap_dm_timer_set_int_enable,
1210 .set_int_disable = omap_dm_timer_set_int_disable,
1211 .free = omap_dm_timer_free,
1212 .enable = omap_dm_timer_enable,
1213 .disable = omap_dm_timer_disable,
1214 .get_fclk = omap_dm_timer_get_fclk,
1215 .start = omap_dm_timer_start,
1216 .stop = omap_dm_timer_stop,
1217 .set_load = omap_dm_timer_set_load,
1218 .set_match = omap_dm_timer_set_match,
1219 .set_pwm = omap_dm_timer_set_pwm,
1220 .get_pwm_status = omap_dm_timer_get_pwm_status,
1221 .set_prescaler = omap_dm_timer_set_prescaler,
1222 .read_counter = omap_dm_timer_read_counter,
1223 .write_counter = omap_dm_timer_write_counter,
1224 .read_status = omap_dm_timer_read_status,
1225 .write_status = omap_dm_timer_write_status,
1226};
1227
1228static const struct dmtimer_platform_data omap3plus_pdata = {
1229 .timer_errata = OMAP_TIMER_ERRATA_I103_I767,
1230 .timer_ops = &dmtimer_ops,
1231};
1232
1233static const struct dmtimer_platform_data am6_pdata = {
1234 .timer_ops = &dmtimer_ops,
1235};
1236
1237static const struct of_device_id omap_timer_match[] = {
1238 {
1239 .compatible = "ti,omap2420-timer",
1240 },
1241 {
1242 .compatible = "ti,omap3430-timer",
1243 .data = &omap3plus_pdata,
1244 },
1245 {
1246 .compatible = "ti,omap4430-timer",
1247 .data = &omap3plus_pdata,
1248 },
1249 {
1250 .compatible = "ti,omap5430-timer",
1251 .data = &omap3plus_pdata,
1252 },
1253 {
1254 .compatible = "ti,am335x-timer",
1255 .data = &omap3plus_pdata,
1256 },
1257 {
1258 .compatible = "ti,am335x-timer-1ms",
1259 .data = &omap3plus_pdata,
1260 },
1261 {
1262 .compatible = "ti,dm816-timer",
1263 .data = &omap3plus_pdata,
1264 },
1265 {
1266 .compatible = "ti,am654-timer",
1267 .data = &am6_pdata,
1268 },
1269 {},
1270};
1271MODULE_DEVICE_TABLE(of, omap_timer_match);
1272
1273static struct platform_driver omap_dm_timer_driver = {
1274 .probe = omap_dm_timer_probe,
1275 .remove = omap_dm_timer_remove,
1276 .driver = {
1277 .name = "omap_timer",
1278 .of_match_table = omap_timer_match,
1279 .pm = &omap_dm_timer_pm_ops,
1280 },
1281};
1282
1283module_platform_driver(omap_dm_timer_driver);
1284
1285MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
1286MODULE_LICENSE("GPL");
1287MODULE_AUTHOR("Texas Instruments Inc");
1/*
2 * linux/arch/arm/plat-omap/dmtimer.c
3 *
4 * OMAP Dual-Mode Timers
5 *
6 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
7 * Tarun Kanti DebBarma <tarun.kanti@ti.com>
8 * Thara Gopinath <thara@ti.com>
9 *
10 * dmtimer adaptation to platform_driver.
11 *
12 * Copyright (C) 2005 Nokia Corporation
13 * OMAP2 support by Juha Yrjola
14 * API improvements and OMAP2 clock framework support by Timo Teras
15 *
16 * Copyright (C) 2009 Texas Instruments
17 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
18 *
19 * This program is free software; you can redistribute it and/or modify it
20 * under the terms of the GNU General Public License as published by the
21 * Free Software Foundation; either version 2 of the License, or (at your
22 * option) any later version.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
27 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * You should have received a copy of the GNU General Public License along
34 * with this program; if not, write to the Free Software Foundation, Inc.,
35 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 */
37
38#include <linux/clk.h>
39#include <linux/clk-provider.h>
40#include <linux/module.h>
41#include <linux/io.h>
42#include <linux/device.h>
43#include <linux/err.h>
44#include <linux/pm_runtime.h>
45#include <linux/of.h>
46#include <linux/of_device.h>
47#include <linux/platform_device.h>
48#include <linux/platform_data/dmtimer-omap.h>
49
50#include <clocksource/timer-ti-dm.h>
51
52static u32 omap_reserved_systimers;
53static LIST_HEAD(omap_timer_list);
54static DEFINE_SPINLOCK(dm_timer_lock);
55
56enum {
57 REQUEST_ANY = 0,
58 REQUEST_BY_ID,
59 REQUEST_BY_CAP,
60 REQUEST_BY_NODE,
61};
62
63/**
64 * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
65 * @timer: timer pointer over which read operation to perform
66 * @reg: lowest byte holds the register offset
67 *
68 * The posted mode bit is encoded in reg. Note that in posted mode write
69 * pending bit must be checked. Otherwise a read of a non completed write
70 * will produce an error.
71 */
72static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
73{
74 WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
75 return __omap_dm_timer_read(timer, reg, timer->posted);
76}
77
78/**
79 * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
80 * @timer: timer pointer over which write operation is to perform
81 * @reg: lowest byte holds the register offset
82 * @value: data to write into the register
83 *
84 * The posted mode bit is encoded in reg. Note that in posted mode the write
85 * pending bit must be checked. Otherwise a write on a register which has a
86 * pending write will be lost.
87 */
88static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
89 u32 value)
90{
91 WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
92 __omap_dm_timer_write(timer, reg, value, timer->posted);
93}
94
95static void omap_timer_restore_context(struct omap_dm_timer *timer)
96{
97 omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
98 timer->context.twer);
99 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
100 timer->context.tcrr);
101 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
102 timer->context.tldr);
103 omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
104 timer->context.tmar);
105 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
106 timer->context.tsicr);
107 writel_relaxed(timer->context.tier, timer->irq_ena);
108 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
109 timer->context.tclr);
110}
111
112static int omap_dm_timer_reset(struct omap_dm_timer *timer)
113{
114 u32 l, timeout = 100000;
115
116 if (timer->revision != 1)
117 return -EINVAL;
118
119 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
120
121 do {
122 l = __omap_dm_timer_read(timer,
123 OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
124 } while (!l && timeout--);
125
126 if (!timeout) {
127 dev_err(&timer->pdev->dev, "Timer failed to reset\n");
128 return -ETIMEDOUT;
129 }
130
131 /* Configure timer for smart-idle mode */
132 l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
133 l |= 0x2 << 0x3;
134 __omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
135
136 timer->posted = 0;
137
138 return 0;
139}
140
141static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
142{
143 int ret;
144 struct clk *parent;
145
146 /*
147 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
148 * do not call clk_get() for these devices.
149 */
150 if (!timer->fclk)
151 return -ENODEV;
152
153 parent = clk_get(&timer->pdev->dev, NULL);
154 if (IS_ERR(parent))
155 return -ENODEV;
156
157 /* Bail out if both clocks point to fck */
158 if (clk_is_match(parent, timer->fclk))
159 return 0;
160
161 ret = clk_set_parent(timer->fclk, parent);
162 if (ret < 0)
163 pr_err("%s: failed to set parent\n", __func__);
164
165 clk_put(parent);
166
167 return ret;
168}
169
170static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
171{
172 int ret;
173 const char *parent_name;
174 struct clk *parent;
175 struct dmtimer_platform_data *pdata;
176
177 if (unlikely(!timer) || IS_ERR(timer->fclk))
178 return -EINVAL;
179
180 switch (source) {
181 case OMAP_TIMER_SRC_SYS_CLK:
182 parent_name = "timer_sys_ck";
183 break;
184 case OMAP_TIMER_SRC_32_KHZ:
185 parent_name = "timer_32k_ck";
186 break;
187 case OMAP_TIMER_SRC_EXT_CLK:
188 parent_name = "timer_ext_ck";
189 break;
190 default:
191 return -EINVAL;
192 }
193
194 pdata = timer->pdev->dev.platform_data;
195
196 /*
197 * FIXME: Used for OMAP1 devices only because they do not currently
198 * use the clock framework to set the parent clock. To be removed
199 * once OMAP1 migrated to using clock framework for dmtimers
200 */
201 if (pdata && pdata->set_timer_src)
202 return pdata->set_timer_src(timer->pdev, source);
203
204#if defined(CONFIG_COMMON_CLK)
205 /* Check if the clock has configurable parents */
206 if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
207 return 0;
208#endif
209
210 parent = clk_get(&timer->pdev->dev, parent_name);
211 if (IS_ERR(parent)) {
212 pr_err("%s: %s not found\n", __func__, parent_name);
213 return -EINVAL;
214 }
215
216 ret = clk_set_parent(timer->fclk, parent);
217 if (ret < 0)
218 pr_err("%s: failed to set %s as parent\n", __func__,
219 parent_name);
220
221 clk_put(parent);
222
223 return ret;
224}
225
226static void omap_dm_timer_enable(struct omap_dm_timer *timer)
227{
228 int c;
229
230 pm_runtime_get_sync(&timer->pdev->dev);
231
232 if (!(timer->capability & OMAP_TIMER_ALWON)) {
233 if (timer->get_context_loss_count) {
234 c = timer->get_context_loss_count(&timer->pdev->dev);
235 if (c != timer->ctx_loss_count) {
236 omap_timer_restore_context(timer);
237 timer->ctx_loss_count = c;
238 }
239 } else {
240 omap_timer_restore_context(timer);
241 }
242 }
243}
244
245static void omap_dm_timer_disable(struct omap_dm_timer *timer)
246{
247 pm_runtime_put_sync(&timer->pdev->dev);
248}
249
250static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
251{
252 int rc;
253
254 /*
255 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
256 * do not call clk_get() for these devices.
257 */
258 if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
259 timer->fclk = clk_get(&timer->pdev->dev, "fck");
260 if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
261 dev_err(&timer->pdev->dev, ": No fclk handle.\n");
262 return -EINVAL;
263 }
264 }
265
266 omap_dm_timer_enable(timer);
267
268 if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
269 rc = omap_dm_timer_reset(timer);
270 if (rc) {
271 omap_dm_timer_disable(timer);
272 return rc;
273 }
274 }
275
276 __omap_dm_timer_enable_posted(timer);
277 omap_dm_timer_disable(timer);
278
279 rc = omap_dm_timer_of_set_source(timer);
280 if (rc == -ENODEV)
281 return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
282
283 return rc;
284}
285
286static inline u32 omap_dm_timer_reserved_systimer(int id)
287{
288 return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
289}
290
291int omap_dm_timer_reserve_systimer(int id)
292{
293 if (omap_dm_timer_reserved_systimer(id))
294 return -ENODEV;
295
296 omap_reserved_systimers |= (1 << (id - 1));
297
298 return 0;
299}
300
301static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
302{
303 struct omap_dm_timer *timer = NULL, *t;
304 struct device_node *np = NULL;
305 unsigned long flags;
306 u32 cap = 0;
307 int id = 0;
308
309 switch (req_type) {
310 case REQUEST_BY_ID:
311 id = *(int *)data;
312 break;
313 case REQUEST_BY_CAP:
314 cap = *(u32 *)data;
315 break;
316 case REQUEST_BY_NODE:
317 np = (struct device_node *)data;
318 break;
319 default:
320 /* REQUEST_ANY */
321 break;
322 }
323
324 spin_lock_irqsave(&dm_timer_lock, flags);
325 list_for_each_entry(t, &omap_timer_list, node) {
326 if (t->reserved)
327 continue;
328
329 switch (req_type) {
330 case REQUEST_BY_ID:
331 if (id == t->pdev->id) {
332 timer = t;
333 timer->reserved = 1;
334 goto found;
335 }
336 break;
337 case REQUEST_BY_CAP:
338 if (cap == (t->capability & cap)) {
339 /*
340 * If timer is not NULL, we have already found
341 * one timer. But it was not an exact match
342 * because it had more capabilities than what
343 * was required. Therefore, unreserve the last
344 * timer found and see if this one is a better
345 * match.
346 */
347 if (timer)
348 timer->reserved = 0;
349 timer = t;
350 timer->reserved = 1;
351
352 /* Exit loop early if we find an exact match */
353 if (t->capability == cap)
354 goto found;
355 }
356 break;
357 case REQUEST_BY_NODE:
358 if (np == t->pdev->dev.of_node) {
359 timer = t;
360 timer->reserved = 1;
361 goto found;
362 }
363 break;
364 default:
365 /* REQUEST_ANY */
366 timer = t;
367 timer->reserved = 1;
368 goto found;
369 }
370 }
371found:
372 spin_unlock_irqrestore(&dm_timer_lock, flags);
373
374 if (timer && omap_dm_timer_prepare(timer)) {
375 timer->reserved = 0;
376 timer = NULL;
377 }
378
379 if (!timer)
380 pr_debug("%s: timer request failed!\n", __func__);
381
382 return timer;
383}
384
385static struct omap_dm_timer *omap_dm_timer_request(void)
386{
387 return _omap_dm_timer_request(REQUEST_ANY, NULL);
388}
389
390static struct omap_dm_timer *omap_dm_timer_request_specific(int id)
391{
392 /* Requesting timer by ID is not supported when device tree is used */
393 if (of_have_populated_dt()) {
394 pr_warn("%s: Please use omap_dm_timer_request_by_node()\n",
395 __func__);
396 return NULL;
397 }
398
399 return _omap_dm_timer_request(REQUEST_BY_ID, &id);
400}
401
402/**
403 * omap_dm_timer_request_by_cap - Request a timer by capability
404 * @cap: Bit mask of capabilities to match
405 *
406 * Find a timer based upon capabilities bit mask. Callers of this function
407 * should use the definitions found in the plat/dmtimer.h file under the
408 * comment "timer capabilities used in hwmod database". Returns pointer to
409 * timer handle on success and a NULL pointer on failure.
410 */
411struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
412{
413 return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
414}
415
416/**
417 * omap_dm_timer_request_by_node - Request a timer by device-tree node
418 * @np: Pointer to device-tree timer node
419 *
420 * Request a timer based upon a device node pointer. Returns pointer to
421 * timer handle on success and a NULL pointer on failure.
422 */
423static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
424{
425 if (!np)
426 return NULL;
427
428 return _omap_dm_timer_request(REQUEST_BY_NODE, np);
429}
430
431static int omap_dm_timer_free(struct omap_dm_timer *timer)
432{
433 if (unlikely(!timer))
434 return -EINVAL;
435
436 clk_put(timer->fclk);
437
438 WARN_ON(!timer->reserved);
439 timer->reserved = 0;
440 return 0;
441}
442
443int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
444{
445 if (timer)
446 return timer->irq;
447 return -EINVAL;
448}
449
450#if defined(CONFIG_ARCH_OMAP1)
451#include <mach/hardware.h>
452
453static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
454{
455 return NULL;
456}
457
458/**
459 * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
460 * @inputmask: current value of idlect mask
461 */
462__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
463{
464 int i = 0;
465 struct omap_dm_timer *timer = NULL;
466 unsigned long flags;
467
468 /* If ARMXOR cannot be idled this function call is unnecessary */
469 if (!(inputmask & (1 << 1)))
470 return inputmask;
471
472 /* If any active timer is using ARMXOR return modified mask */
473 spin_lock_irqsave(&dm_timer_lock, flags);
474 list_for_each_entry(timer, &omap_timer_list, node) {
475 u32 l;
476
477 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
478 if (l & OMAP_TIMER_CTRL_ST) {
479 if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
480 inputmask &= ~(1 << 1);
481 else
482 inputmask &= ~(1 << 2);
483 }
484 i++;
485 }
486 spin_unlock_irqrestore(&dm_timer_lock, flags);
487
488 return inputmask;
489}
490
491#else
492
493static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
494{
495 if (timer && !IS_ERR(timer->fclk))
496 return timer->fclk;
497 return NULL;
498}
499
500__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
501{
502 BUG();
503
504 return 0;
505}
506
507#endif
508
509int omap_dm_timer_trigger(struct omap_dm_timer *timer)
510{
511 if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
512 pr_err("%s: timer not available or enabled.\n", __func__);
513 return -EINVAL;
514 }
515
516 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
517 return 0;
518}
519
520static int omap_dm_timer_start(struct omap_dm_timer *timer)
521{
522 u32 l;
523
524 if (unlikely(!timer))
525 return -EINVAL;
526
527 omap_dm_timer_enable(timer);
528
529 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
530 if (!(l & OMAP_TIMER_CTRL_ST)) {
531 l |= OMAP_TIMER_CTRL_ST;
532 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
533 }
534
535 /* Save the context */
536 timer->context.tclr = l;
537 return 0;
538}
539
540static int omap_dm_timer_stop(struct omap_dm_timer *timer)
541{
542 unsigned long rate = 0;
543
544 if (unlikely(!timer))
545 return -EINVAL;
546
547 if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
548 rate = clk_get_rate(timer->fclk);
549
550 __omap_dm_timer_stop(timer, timer->posted, rate);
551
552 /*
553 * Since the register values are computed and written within
554 * __omap_dm_timer_stop, we need to use read to retrieve the
555 * context.
556 */
557 timer->context.tclr =
558 omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
559 omap_dm_timer_disable(timer);
560 return 0;
561}
562
563static int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
564 unsigned int load)
565{
566 u32 l;
567
568 if (unlikely(!timer))
569 return -EINVAL;
570
571 omap_dm_timer_enable(timer);
572 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
573 if (autoreload)
574 l |= OMAP_TIMER_CTRL_AR;
575 else
576 l &= ~OMAP_TIMER_CTRL_AR;
577 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
578 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
579
580 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
581 /* Save the context */
582 timer->context.tclr = l;
583 timer->context.tldr = load;
584 omap_dm_timer_disable(timer);
585 return 0;
586}
587
588static int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
589 unsigned int match)
590{
591 u32 l;
592
593 if (unlikely(!timer))
594 return -EINVAL;
595
596 omap_dm_timer_enable(timer);
597 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
598 if (enable)
599 l |= OMAP_TIMER_CTRL_CE;
600 else
601 l &= ~OMAP_TIMER_CTRL_CE;
602 omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
603 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
604
605 /* Save the context */
606 timer->context.tclr = l;
607 timer->context.tmar = match;
608 omap_dm_timer_disable(timer);
609 return 0;
610}
611
612static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
613 int toggle, int trigger)
614{
615 u32 l;
616
617 if (unlikely(!timer))
618 return -EINVAL;
619
620 omap_dm_timer_enable(timer);
621 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
622 l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
623 OMAP_TIMER_CTRL_PT | (0x03 << 10));
624 if (def_on)
625 l |= OMAP_TIMER_CTRL_SCPWM;
626 if (toggle)
627 l |= OMAP_TIMER_CTRL_PT;
628 l |= trigger << 10;
629 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
630
631 /* Save the context */
632 timer->context.tclr = l;
633 omap_dm_timer_disable(timer);
634 return 0;
635}
636
637static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer,
638 int prescaler)
639{
640 u32 l;
641
642 if (unlikely(!timer) || prescaler < -1 || prescaler > 7)
643 return -EINVAL;
644
645 omap_dm_timer_enable(timer);
646 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
647 l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
648 if (prescaler >= 0) {
649 l |= OMAP_TIMER_CTRL_PRE;
650 l |= prescaler << 2;
651 }
652 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
653
654 /* Save the context */
655 timer->context.tclr = l;
656 omap_dm_timer_disable(timer);
657 return 0;
658}
659
660static int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
661 unsigned int value)
662{
663 if (unlikely(!timer))
664 return -EINVAL;
665
666 omap_dm_timer_enable(timer);
667 __omap_dm_timer_int_enable(timer, value);
668
669 /* Save the context */
670 timer->context.tier = value;
671 timer->context.twer = value;
672 omap_dm_timer_disable(timer);
673 return 0;
674}
675
676/**
677 * omap_dm_timer_set_int_disable - disable timer interrupts
678 * @timer: pointer to timer handle
679 * @mask: bit mask of interrupts to be disabled
680 *
681 * Disables the specified timer interrupts for a timer.
682 */
683static int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
684{
685 u32 l = mask;
686
687 if (unlikely(!timer))
688 return -EINVAL;
689
690 omap_dm_timer_enable(timer);
691
692 if (timer->revision == 1)
693 l = readl_relaxed(timer->irq_ena) & ~mask;
694
695 writel_relaxed(l, timer->irq_dis);
696 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
697 omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
698
699 /* Save the context */
700 timer->context.tier &= ~mask;
701 timer->context.twer &= ~mask;
702 omap_dm_timer_disable(timer);
703 return 0;
704}
705
706static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
707{
708 unsigned int l;
709
710 if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
711 pr_err("%s: timer not available or enabled.\n", __func__);
712 return 0;
713 }
714
715 l = readl_relaxed(timer->irq_stat);
716
717 return l;
718}
719
720static int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
721{
722 if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
723 return -EINVAL;
724
725 __omap_dm_timer_write_status(timer, value);
726
727 return 0;
728}
729
730static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
731{
732 if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
733 pr_err("%s: timer not iavailable or enabled.\n", __func__);
734 return 0;
735 }
736
737 return __omap_dm_timer_read_counter(timer, timer->posted);
738}
739
740static int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
741{
742 if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
743 pr_err("%s: timer not available or enabled.\n", __func__);
744 return -EINVAL;
745 }
746
747 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
748
749 /* Save the context */
750 timer->context.tcrr = value;
751 return 0;
752}
753
754int omap_dm_timers_active(void)
755{
756 struct omap_dm_timer *timer;
757
758 list_for_each_entry(timer, &omap_timer_list, node) {
759 if (!timer->reserved)
760 continue;
761
762 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
763 OMAP_TIMER_CTRL_ST) {
764 return 1;
765 }
766 }
767 return 0;
768}
769
770static const struct of_device_id omap_timer_match[];
771
772/**
773 * omap_dm_timer_probe - probe function called for every registered device
774 * @pdev: pointer to current timer platform device
775 *
776 * Called by driver framework at the end of device registration for all
777 * timer devices.
778 */
779static int omap_dm_timer_probe(struct platform_device *pdev)
780{
781 unsigned long flags;
782 struct omap_dm_timer *timer;
783 struct resource *mem, *irq;
784 struct device *dev = &pdev->dev;
785 const struct dmtimer_platform_data *pdata;
786 int ret;
787
788 pdata = of_device_get_match_data(dev);
789 if (!pdata)
790 pdata = dev_get_platdata(dev);
791 else
792 dev->platform_data = (void *)pdata;
793
794 if (!pdata) {
795 dev_err(dev, "%s: no platform data.\n", __func__);
796 return -ENODEV;
797 }
798
799 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
800 if (unlikely(!irq)) {
801 dev_err(dev, "%s: no IRQ resource.\n", __func__);
802 return -ENODEV;
803 }
804
805 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
806 if (unlikely(!mem)) {
807 dev_err(dev, "%s: no memory resource.\n", __func__);
808 return -ENODEV;
809 }
810
811 timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
812 if (!timer)
813 return -ENOMEM;
814
815 timer->fclk = ERR_PTR(-ENODEV);
816 timer->io_base = devm_ioremap_resource(dev, mem);
817 if (IS_ERR(timer->io_base))
818 return PTR_ERR(timer->io_base);
819
820 if (dev->of_node) {
821 if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
822 timer->capability |= OMAP_TIMER_ALWON;
823 if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
824 timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
825 if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
826 timer->capability |= OMAP_TIMER_HAS_PWM;
827 if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
828 timer->capability |= OMAP_TIMER_SECURE;
829 } else {
830 timer->id = pdev->id;
831 timer->capability = pdata->timer_capability;
832 timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
833 timer->get_context_loss_count = pdata->get_context_loss_count;
834 }
835
836 if (pdata)
837 timer->errata = pdata->timer_errata;
838
839 timer->irq = irq->start;
840 timer->pdev = pdev;
841
842 pm_runtime_enable(dev);
843
844 if (!timer->reserved) {
845 ret = pm_runtime_get_sync(dev);
846 if (ret < 0) {
847 dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
848 __func__);
849 goto err_get_sync;
850 }
851 __omap_dm_timer_init_regs(timer);
852 pm_runtime_put(dev);
853 }
854
855 /* add the timer element to the list */
856 spin_lock_irqsave(&dm_timer_lock, flags);
857 list_add_tail(&timer->node, &omap_timer_list);
858 spin_unlock_irqrestore(&dm_timer_lock, flags);
859
860 dev_dbg(dev, "Device Probed.\n");
861
862 return 0;
863
864err_get_sync:
865 pm_runtime_put_noidle(dev);
866 pm_runtime_disable(dev);
867 return ret;
868}
869
870/**
871 * omap_dm_timer_remove - cleanup a registered timer device
872 * @pdev: pointer to current timer platform device
873 *
874 * Called by driver framework whenever a timer device is unregistered.
875 * In addition to freeing platform resources it also deletes the timer
876 * entry from the local list.
877 */
878static int omap_dm_timer_remove(struct platform_device *pdev)
879{
880 struct omap_dm_timer *timer;
881 unsigned long flags;
882 int ret = -EINVAL;
883
884 spin_lock_irqsave(&dm_timer_lock, flags);
885 list_for_each_entry(timer, &omap_timer_list, node)
886 if (!strcmp(dev_name(&timer->pdev->dev),
887 dev_name(&pdev->dev))) {
888 list_del(&timer->node);
889 ret = 0;
890 break;
891 }
892 spin_unlock_irqrestore(&dm_timer_lock, flags);
893
894 pm_runtime_disable(&pdev->dev);
895
896 return ret;
897}
898
899static const struct omap_dm_timer_ops dmtimer_ops = {
900 .request_by_node = omap_dm_timer_request_by_node,
901 .request_specific = omap_dm_timer_request_specific,
902 .request = omap_dm_timer_request,
903 .set_source = omap_dm_timer_set_source,
904 .get_irq = omap_dm_timer_get_irq,
905 .set_int_enable = omap_dm_timer_set_int_enable,
906 .set_int_disable = omap_dm_timer_set_int_disable,
907 .free = omap_dm_timer_free,
908 .enable = omap_dm_timer_enable,
909 .disable = omap_dm_timer_disable,
910 .get_fclk = omap_dm_timer_get_fclk,
911 .start = omap_dm_timer_start,
912 .stop = omap_dm_timer_stop,
913 .set_load = omap_dm_timer_set_load,
914 .set_match = omap_dm_timer_set_match,
915 .set_pwm = omap_dm_timer_set_pwm,
916 .set_prescaler = omap_dm_timer_set_prescaler,
917 .read_counter = omap_dm_timer_read_counter,
918 .write_counter = omap_dm_timer_write_counter,
919 .read_status = omap_dm_timer_read_status,
920 .write_status = omap_dm_timer_write_status,
921};
922
923static const struct dmtimer_platform_data omap3plus_pdata = {
924 .timer_errata = OMAP_TIMER_ERRATA_I103_I767,
925 .timer_ops = &dmtimer_ops,
926};
927
928static const struct of_device_id omap_timer_match[] = {
929 {
930 .compatible = "ti,omap2420-timer",
931 },
932 {
933 .compatible = "ti,omap3430-timer",
934 .data = &omap3plus_pdata,
935 },
936 {
937 .compatible = "ti,omap4430-timer",
938 .data = &omap3plus_pdata,
939 },
940 {
941 .compatible = "ti,omap5430-timer",
942 .data = &omap3plus_pdata,
943 },
944 {
945 .compatible = "ti,am335x-timer",
946 .data = &omap3plus_pdata,
947 },
948 {
949 .compatible = "ti,am335x-timer-1ms",
950 .data = &omap3plus_pdata,
951 },
952 {
953 .compatible = "ti,dm816-timer",
954 .data = &omap3plus_pdata,
955 },
956 {},
957};
958MODULE_DEVICE_TABLE(of, omap_timer_match);
959
960static struct platform_driver omap_dm_timer_driver = {
961 .probe = omap_dm_timer_probe,
962 .remove = omap_dm_timer_remove,
963 .driver = {
964 .name = "omap_timer",
965 .of_match_table = of_match_ptr(omap_timer_match),
966 },
967};
968
969module_platform_driver(omap_dm_timer_driver);
970
971MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
972MODULE_LICENSE("GPL");
973MODULE_AUTHOR("Texas Instruments Inc");