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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
[deliverable/linux.git] / arch / arm / plat-omap / dmtimer.c
1 /*
2 * linux/arch/arm/plat-omap/dmtimer.c
3 *
4 * OMAP Dual-Mode Timers
5 *
6 * Copyright (C) 2005 Nokia Corporation
7 * OMAP2 support by Juha Yrjola
8 * API improvements and OMAP2 clock framework support by Timo Teras
9 *
10 * Copyright (C) 2009 Texas Instruments
11 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
21 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * You should have received a copy of the GNU General Public License along
28 * with this program; if not, write to the Free Software Foundation, Inc.,
29 * 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32 #include <linux/init.h>
33 #include <linux/spinlock.h>
34 #include <linux/errno.h>
35 #include <linux/list.h>
36 #include <linux/clk.h>
37 #include <linux/delay.h>
38 #include <linux/io.h>
39 #include <linux/module.h>
40 #include <mach/hardware.h>
41 #include <plat/dmtimer.h>
42 #include <mach/irqs.h>
43
44 /* register offsets */
45 #define _OMAP_TIMER_ID_OFFSET 0x00
46 #define _OMAP_TIMER_OCP_CFG_OFFSET 0x10
47 #define _OMAP_TIMER_SYS_STAT_OFFSET 0x14
48 #define _OMAP_TIMER_STAT_OFFSET 0x18
49 #define _OMAP_TIMER_INT_EN_OFFSET 0x1c
50 #define _OMAP_TIMER_WAKEUP_EN_OFFSET 0x20
51 #define _OMAP_TIMER_CTRL_OFFSET 0x24
52 #define OMAP_TIMER_CTRL_GPOCFG (1 << 14)
53 #define OMAP_TIMER_CTRL_CAPTMODE (1 << 13)
54 #define OMAP_TIMER_CTRL_PT (1 << 12)
55 #define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8)
56 #define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8)
57 #define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8)
58 #define OMAP_TIMER_CTRL_SCPWM (1 << 7)
59 #define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */
60 #define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */
61 #define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* prescaler value shift */
62 #define OMAP_TIMER_CTRL_POSTED (1 << 2)
63 #define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */
64 #define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */
65 #define _OMAP_TIMER_COUNTER_OFFSET 0x28
66 #define _OMAP_TIMER_LOAD_OFFSET 0x2c
67 #define _OMAP_TIMER_TRIGGER_OFFSET 0x30
68 #define _OMAP_TIMER_WRITE_PEND_OFFSET 0x34
69 #define WP_NONE 0 /* no write pending bit */
70 #define WP_TCLR (1 << 0)
71 #define WP_TCRR (1 << 1)
72 #define WP_TLDR (1 << 2)
73 #define WP_TTGR (1 << 3)
74 #define WP_TMAR (1 << 4)
75 #define WP_TPIR (1 << 5)
76 #define WP_TNIR (1 << 6)
77 #define WP_TCVR (1 << 7)
78 #define WP_TOCR (1 << 8)
79 #define WP_TOWR (1 << 9)
80 #define _OMAP_TIMER_MATCH_OFFSET 0x38
81 #define _OMAP_TIMER_CAPTURE_OFFSET 0x3c
82 #define _OMAP_TIMER_IF_CTRL_OFFSET 0x40
83 #define _OMAP_TIMER_CAPTURE2_OFFSET 0x44 /* TCAR2, 34xx only */
84 #define _OMAP_TIMER_TICK_POS_OFFSET 0x48 /* TPIR, 34xx only */
85 #define _OMAP_TIMER_TICK_NEG_OFFSET 0x4c /* TNIR, 34xx only */
86 #define _OMAP_TIMER_TICK_COUNT_OFFSET 0x50 /* TCVR, 34xx only */
87 #define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET 0x54 /* TOCR, 34xx only */
88 #define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET 0x58 /* TOWR, 34xx only */
89
90 /* register offsets with the write pending bit encoded */
91 #define WPSHIFT 16
92
93 #define OMAP_TIMER_ID_REG (_OMAP_TIMER_ID_OFFSET \
94 | (WP_NONE << WPSHIFT))
95
96 #define OMAP_TIMER_OCP_CFG_REG (_OMAP_TIMER_OCP_CFG_OFFSET \
97 | (WP_NONE << WPSHIFT))
98
99 #define OMAP_TIMER_SYS_STAT_REG (_OMAP_TIMER_SYS_STAT_OFFSET \
100 | (WP_NONE << WPSHIFT))
101
102 #define OMAP_TIMER_STAT_REG (_OMAP_TIMER_STAT_OFFSET \
103 | (WP_NONE << WPSHIFT))
104
105 #define OMAP_TIMER_INT_EN_REG (_OMAP_TIMER_INT_EN_OFFSET \
106 | (WP_NONE << WPSHIFT))
107
108 #define OMAP_TIMER_WAKEUP_EN_REG (_OMAP_TIMER_WAKEUP_EN_OFFSET \
109 | (WP_NONE << WPSHIFT))
110
111 #define OMAP_TIMER_CTRL_REG (_OMAP_TIMER_CTRL_OFFSET \
112 | (WP_TCLR << WPSHIFT))
113
114 #define OMAP_TIMER_COUNTER_REG (_OMAP_TIMER_COUNTER_OFFSET \
115 | (WP_TCRR << WPSHIFT))
116
117 #define OMAP_TIMER_LOAD_REG (_OMAP_TIMER_LOAD_OFFSET \
118 | (WP_TLDR << WPSHIFT))
119
120 #define OMAP_TIMER_TRIGGER_REG (_OMAP_TIMER_TRIGGER_OFFSET \
121 | (WP_TTGR << WPSHIFT))
122
123 #define OMAP_TIMER_WRITE_PEND_REG (_OMAP_TIMER_WRITE_PEND_OFFSET \
124 | (WP_NONE << WPSHIFT))
125
126 #define OMAP_TIMER_MATCH_REG (_OMAP_TIMER_MATCH_OFFSET \
127 | (WP_TMAR << WPSHIFT))
128
129 #define OMAP_TIMER_CAPTURE_REG (_OMAP_TIMER_CAPTURE_OFFSET \
130 | (WP_NONE << WPSHIFT))
131
132 #define OMAP_TIMER_IF_CTRL_REG (_OMAP_TIMER_IF_CTRL_OFFSET \
133 | (WP_NONE << WPSHIFT))
134
135 #define OMAP_TIMER_CAPTURE2_REG (_OMAP_TIMER_CAPTURE2_OFFSET \
136 | (WP_NONE << WPSHIFT))
137
138 #define OMAP_TIMER_TICK_POS_REG (_OMAP_TIMER_TICK_POS_OFFSET \
139 | (WP_TPIR << WPSHIFT))
140
141 #define OMAP_TIMER_TICK_NEG_REG (_OMAP_TIMER_TICK_NEG_OFFSET \
142 | (WP_TNIR << WPSHIFT))
143
144 #define OMAP_TIMER_TICK_COUNT_REG (_OMAP_TIMER_TICK_COUNT_OFFSET \
145 | (WP_TCVR << WPSHIFT))
146
147 #define OMAP_TIMER_TICK_INT_MASK_SET_REG \
148 (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
149
150 #define OMAP_TIMER_TICK_INT_MASK_COUNT_REG \
151 (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
152
153 struct omap_dm_timer {
154 unsigned long phys_base;
155 int irq;
156 #ifdef CONFIG_ARCH_OMAP2PLUS
157 struct clk *iclk, *fclk;
158 #endif
159 void __iomem *io_base;
160 unsigned reserved:1;
161 unsigned enabled:1;
162 unsigned posted:1;
163 };
164
165 static int dm_timer_count;
166
167 #ifdef CONFIG_ARCH_OMAP1
168 static struct omap_dm_timer omap1_dm_timers[] = {
169 { .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
170 { .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
171 { .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
172 { .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
173 { .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
174 { .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
175 { .phys_base = 0xfffb7400, .irq = INT_1610_GPTIMER7 },
176 { .phys_base = 0xfffbd400, .irq = INT_1610_GPTIMER8 },
177 };
178
179 static const int omap1_dm_timer_count = ARRAY_SIZE(omap1_dm_timers);
180
181 #else
182 #define omap1_dm_timers NULL
183 #define omap1_dm_timer_count 0
184 #endif /* CONFIG_ARCH_OMAP1 */
185
186 #ifdef CONFIG_ARCH_OMAP2
187 static struct omap_dm_timer omap2_dm_timers[] = {
188 { .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
189 { .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
190 { .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
191 { .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
192 { .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
193 { .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
194 { .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
195 { .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
196 { .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
197 { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
198 { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
199 { .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
200 };
201
202 static const char *omap2_dm_source_names[] __initdata = {
203 "sys_ck",
204 "func_32k_ck",
205 "alt_ck",
206 NULL
207 };
208
209 static struct clk *omap2_dm_source_clocks[3];
210 static const int omap2_dm_timer_count = ARRAY_SIZE(omap2_dm_timers);
211
212 #else
213 #define omap2_dm_timers NULL
214 #define omap2_dm_timer_count 0
215 #define omap2_dm_source_names NULL
216 #define omap2_dm_source_clocks NULL
217 #endif /* CONFIG_ARCH_OMAP2 */
218
219 #ifdef CONFIG_ARCH_OMAP3
220 static struct omap_dm_timer omap3_dm_timers[] = {
221 { .phys_base = 0x48318000, .irq = INT_24XX_GPTIMER1 },
222 { .phys_base = 0x49032000, .irq = INT_24XX_GPTIMER2 },
223 { .phys_base = 0x49034000, .irq = INT_24XX_GPTIMER3 },
224 { .phys_base = 0x49036000, .irq = INT_24XX_GPTIMER4 },
225 { .phys_base = 0x49038000, .irq = INT_24XX_GPTIMER5 },
226 { .phys_base = 0x4903A000, .irq = INT_24XX_GPTIMER6 },
227 { .phys_base = 0x4903C000, .irq = INT_24XX_GPTIMER7 },
228 { .phys_base = 0x4903E000, .irq = INT_24XX_GPTIMER8 },
229 { .phys_base = 0x49040000, .irq = INT_24XX_GPTIMER9 },
230 { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
231 { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
232 { .phys_base = 0x48304000, .irq = INT_34XX_GPT12_IRQ },
233 };
234
235 static const char *omap3_dm_source_names[] __initdata = {
236 "sys_ck",
237 "omap_32k_fck",
238 NULL
239 };
240
241 static struct clk *omap3_dm_source_clocks[2];
242 static const int omap3_dm_timer_count = ARRAY_SIZE(omap3_dm_timers);
243
244 #else
245 #define omap3_dm_timers NULL
246 #define omap3_dm_timer_count 0
247 #define omap3_dm_source_names NULL
248 #define omap3_dm_source_clocks NULL
249 #endif /* CONFIG_ARCH_OMAP3 */
250
251 #ifdef CONFIG_ARCH_OMAP4
252 static struct omap_dm_timer omap4_dm_timers[] = {
253 { .phys_base = 0x4a318000, .irq = OMAP44XX_IRQ_GPT1 },
254 { .phys_base = 0x48032000, .irq = OMAP44XX_IRQ_GPT2 },
255 { .phys_base = 0x48034000, .irq = OMAP44XX_IRQ_GPT3 },
256 { .phys_base = 0x48036000, .irq = OMAP44XX_IRQ_GPT4 },
257 { .phys_base = 0x40138000, .irq = OMAP44XX_IRQ_GPT5 },
258 { .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT6 },
259 { .phys_base = 0x4013a000, .irq = OMAP44XX_IRQ_GPT7 },
260 { .phys_base = 0x4013e000, .irq = OMAP44XX_IRQ_GPT8 },
261 { .phys_base = 0x4803e000, .irq = OMAP44XX_IRQ_GPT9 },
262 { .phys_base = 0x48086000, .irq = OMAP44XX_IRQ_GPT10 },
263 { .phys_base = 0x48088000, .irq = OMAP44XX_IRQ_GPT11 },
264 { .phys_base = 0x4a320000, .irq = OMAP44XX_IRQ_GPT12 },
265 };
266 static const char *omap4_dm_source_names[] __initdata = {
267 "sys_ck",
268 "omap_32k_fck",
269 NULL
270 };
271 static struct clk *omap4_dm_source_clocks[2];
272 static const int omap4_dm_timer_count = ARRAY_SIZE(omap4_dm_timers);
273
274 #else
275 #define omap4_dm_timers NULL
276 #define omap4_dm_timer_count 0
277 #define omap4_dm_source_names NULL
278 #define omap4_dm_source_clocks NULL
279 #endif /* CONFIG_ARCH_OMAP4 */
280
281 static struct omap_dm_timer *dm_timers;
282 static const char **dm_source_names;
283 static struct clk **dm_source_clocks;
284
285 static spinlock_t dm_timer_lock;
286
287 /*
288 * Reads timer registers in posted and non-posted mode. The posted mode bit
289 * is encoded in reg. Note that in posted mode write pending bit must be
290 * checked. Otherwise a read of a non completed write will produce an error.
291 */
292 static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
293 {
294 if (timer->posted)
295 while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
296 & (reg >> WPSHIFT))
297 cpu_relax();
298 return readl(timer->io_base + (reg & 0xff));
299 }
300
301 /*
302 * Writes timer registers in posted and non-posted mode. The posted mode bit
303 * is encoded in reg. Note that in posted mode the write pending bit must be
304 * checked. Otherwise a write on a register which has a pending write will be
305 * lost.
306 */
307 static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
308 u32 value)
309 {
310 if (timer->posted)
311 while (readl(timer->io_base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
312 & (reg >> WPSHIFT))
313 cpu_relax();
314 writel(value, timer->io_base + (reg & 0xff));
315 }
316
317 static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
318 {
319 int c;
320
321 c = 0;
322 while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
323 c++;
324 if (c > 100000) {
325 printk(KERN_ERR "Timer failed to reset\n");
326 return;
327 }
328 }
329 }
330
331 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
332 {
333 u32 l;
334
335 if (!cpu_class_is_omap2() || timer != &dm_timers[0]) {
336 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
337 omap_dm_timer_wait_for_reset(timer);
338 }
339 omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
340
341 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
342 l |= 0x02 << 3; /* Set to smart-idle mode */
343 l |= 0x2 << 8; /* Set clock activity to perserve f-clock on idle */
344
345 /*
346 * Enable wake-up on OMAP2 CPUs.
347 */
348 if (cpu_class_is_omap2())
349 l |= 1 << 2;
350 omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
351
352 /* Match hardware reset default of posted mode */
353 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
354 OMAP_TIMER_CTRL_POSTED);
355 timer->posted = 1;
356 }
357
358 static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
359 {
360 omap_dm_timer_enable(timer);
361 omap_dm_timer_reset(timer);
362 }
363
364 struct omap_dm_timer *omap_dm_timer_request(void)
365 {
366 struct omap_dm_timer *timer = NULL;
367 unsigned long flags;
368 int i;
369
370 spin_lock_irqsave(&dm_timer_lock, flags);
371 for (i = 0; i < dm_timer_count; i++) {
372 if (dm_timers[i].reserved)
373 continue;
374
375 timer = &dm_timers[i];
376 timer->reserved = 1;
377 break;
378 }
379 spin_unlock_irqrestore(&dm_timer_lock, flags);
380
381 if (timer != NULL)
382 omap_dm_timer_prepare(timer);
383
384 return timer;
385 }
386 EXPORT_SYMBOL_GPL(omap_dm_timer_request);
387
388 struct omap_dm_timer *omap_dm_timer_request_specific(int id)
389 {
390 struct omap_dm_timer *timer;
391 unsigned long flags;
392
393 spin_lock_irqsave(&dm_timer_lock, flags);
394 if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
395 spin_unlock_irqrestore(&dm_timer_lock, flags);
396 printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
397 __FILE__, __LINE__, __func__, id);
398 dump_stack();
399 return NULL;
400 }
401
402 timer = &dm_timers[id-1];
403 timer->reserved = 1;
404 spin_unlock_irqrestore(&dm_timer_lock, flags);
405
406 omap_dm_timer_prepare(timer);
407
408 return timer;
409 }
410 EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
411
412 void omap_dm_timer_free(struct omap_dm_timer *timer)
413 {
414 omap_dm_timer_enable(timer);
415 omap_dm_timer_reset(timer);
416 omap_dm_timer_disable(timer);
417
418 WARN_ON(!timer->reserved);
419 timer->reserved = 0;
420 }
421 EXPORT_SYMBOL_GPL(omap_dm_timer_free);
422
423 void omap_dm_timer_enable(struct omap_dm_timer *timer)
424 {
425 if (timer->enabled)
426 return;
427
428 #ifdef CONFIG_ARCH_OMAP2PLUS
429 if (cpu_class_is_omap2()) {
430 clk_enable(timer->fclk);
431 clk_enable(timer->iclk);
432 }
433 #endif
434
435 timer->enabled = 1;
436 }
437 EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
438
439 void omap_dm_timer_disable(struct omap_dm_timer *timer)
440 {
441 if (!timer->enabled)
442 return;
443
444 #ifdef CONFIG_ARCH_OMAP2PLUS
445 if (cpu_class_is_omap2()) {
446 clk_disable(timer->iclk);
447 clk_disable(timer->fclk);
448 }
449 #endif
450
451 timer->enabled = 0;
452 }
453 EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
454
455 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
456 {
457 return timer->irq;
458 }
459 EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
460
461 #if defined(CONFIG_ARCH_OMAP1)
462
463 /**
464 * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
465 * @inputmask: current value of idlect mask
466 */
467 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
468 {
469 int i;
470
471 /* If ARMXOR cannot be idled this function call is unnecessary */
472 if (!(inputmask & (1 << 1)))
473 return inputmask;
474
475 /* If any active timer is using ARMXOR return modified mask */
476 for (i = 0; i < dm_timer_count; i++) {
477 u32 l;
478
479 l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG);
480 if (l & OMAP_TIMER_CTRL_ST) {
481 if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
482 inputmask &= ~(1 << 1);
483 else
484 inputmask &= ~(1 << 2);
485 }
486 }
487
488 return inputmask;
489 }
490 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
491
492 #else
493
494 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
495 {
496 return timer->fclk;
497 }
498 EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk);
499
500 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
501 {
502 BUG();
503
504 return 0;
505 }
506 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
507
508 #endif
509
510 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
511 {
512 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
513 }
514 EXPORT_SYMBOL_GPL(omap_dm_timer_trigger);
515
516 void omap_dm_timer_start(struct omap_dm_timer *timer)
517 {
518 u32 l;
519
520 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
521 if (!(l & OMAP_TIMER_CTRL_ST)) {
522 l |= OMAP_TIMER_CTRL_ST;
523 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
524 }
525 }
526 EXPORT_SYMBOL_GPL(omap_dm_timer_start);
527
528 void omap_dm_timer_stop(struct omap_dm_timer *timer)
529 {
530 u32 l;
531
532 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
533 if (l & OMAP_TIMER_CTRL_ST) {
534 l &= ~0x1;
535 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
536 #ifdef CONFIG_ARCH_OMAP2PLUS
537 /* Readback to make sure write has completed */
538 omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
539 /*
540 * Wait for functional clock period x 3.5 to make sure that
541 * timer is stopped
542 */
543 udelay(3500000 / clk_get_rate(timer->fclk) + 1);
544 /* Ack possibly pending interrupt */
545 omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG,
546 OMAP_TIMER_INT_OVERFLOW);
547 #endif
548 }
549 }
550 EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
551
552 #ifdef CONFIG_ARCH_OMAP1
553
554 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
555 {
556 int n = (timer - dm_timers) << 1;
557 u32 l;
558
559 l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
560 l |= source << n;
561 omap_writel(l, MOD_CONF_CTRL_1);
562
563 return 0;
564 }
565 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
566
567 #else
568
569 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
570 {
571 int ret = -EINVAL;
572
573 if (source < 0 || source >= 3)
574 return -EINVAL;
575
576 clk_disable(timer->fclk);
577 ret = clk_set_parent(timer->fclk, dm_source_clocks[source]);
578 clk_enable(timer->fclk);
579
580 /*
581 * When the functional clock disappears, too quick writes seem
582 * to cause an abort. XXX Is this still necessary?
583 */
584 __delay(150000);
585
586 return ret;
587 }
588 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
589
590 #endif
591
592 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
593 unsigned int load)
594 {
595 u32 l;
596
597 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
598 if (autoreload)
599 l |= OMAP_TIMER_CTRL_AR;
600 else
601 l &= ~OMAP_TIMER_CTRL_AR;
602 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
603 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
604
605 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
606 }
607 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
608
609 /* Optimized set_load which removes costly spin wait in timer_start */
610 void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
611 unsigned int load)
612 {
613 u32 l;
614
615 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
616 if (autoreload) {
617 l |= OMAP_TIMER_CTRL_AR;
618 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
619 } else {
620 l &= ~OMAP_TIMER_CTRL_AR;
621 }
622 l |= OMAP_TIMER_CTRL_ST;
623
624 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, load);
625 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
626 }
627 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
628
629 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
630 unsigned int match)
631 {
632 u32 l;
633
634 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
635 if (enable)
636 l |= OMAP_TIMER_CTRL_CE;
637 else
638 l &= ~OMAP_TIMER_CTRL_CE;
639 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
640 omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
641 }
642 EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
643
644 void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
645 int toggle, int trigger)
646 {
647 u32 l;
648
649 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
650 l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
651 OMAP_TIMER_CTRL_PT | (0x03 << 10));
652 if (def_on)
653 l |= OMAP_TIMER_CTRL_SCPWM;
654 if (toggle)
655 l |= OMAP_TIMER_CTRL_PT;
656 l |= trigger << 10;
657 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
658 }
659 EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
660
661 void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
662 {
663 u32 l;
664
665 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
666 l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
667 if (prescaler >= 0x00 && prescaler <= 0x07) {
668 l |= OMAP_TIMER_CTRL_PRE;
669 l |= prescaler << 2;
670 }
671 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
672 }
673 EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler);
674
675 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
676 unsigned int value)
677 {
678 omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
679 omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
680 }
681 EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
682
683 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
684 {
685 unsigned int l;
686
687 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
688
689 return l;
690 }
691 EXPORT_SYMBOL_GPL(omap_dm_timer_read_status);
692
693 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
694 {
695 omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
696 }
697 EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);
698
699 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
700 {
701 unsigned int l;
702
703 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
704
705 return l;
706 }
707 EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter);
708
709 void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
710 {
711 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
712 }
713 EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter);
714
715 int omap_dm_timers_active(void)
716 {
717 int i;
718
719 for (i = 0; i < dm_timer_count; i++) {
720 struct omap_dm_timer *timer;
721
722 timer = &dm_timers[i];
723
724 if (!timer->enabled)
725 continue;
726
727 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
728 OMAP_TIMER_CTRL_ST) {
729 return 1;
730 }
731 }
732 return 0;
733 }
734 EXPORT_SYMBOL_GPL(omap_dm_timers_active);
735
736 int __init omap_dm_timer_init(void)
737 {
738 struct omap_dm_timer *timer;
739 int i, map_size = SZ_8K; /* Module 4KB + L4 4KB except on omap1 */
740
741 if (!(cpu_is_omap16xx() || cpu_class_is_omap2()))
742 return -ENODEV;
743
744 spin_lock_init(&dm_timer_lock);
745
746 if (cpu_class_is_omap1()) {
747 dm_timers = omap1_dm_timers;
748 dm_timer_count = omap1_dm_timer_count;
749 map_size = SZ_2K;
750 } else if (cpu_is_omap24xx()) {
751 dm_timers = omap2_dm_timers;
752 dm_timer_count = omap2_dm_timer_count;
753 dm_source_names = omap2_dm_source_names;
754 dm_source_clocks = omap2_dm_source_clocks;
755 } else if (cpu_is_omap34xx()) {
756 dm_timers = omap3_dm_timers;
757 dm_timer_count = omap3_dm_timer_count;
758 dm_source_names = omap3_dm_source_names;
759 dm_source_clocks = omap3_dm_source_clocks;
760 } else if (cpu_is_omap44xx()) {
761 dm_timers = omap4_dm_timers;
762 dm_timer_count = omap4_dm_timer_count;
763 dm_source_names = omap4_dm_source_names;
764 dm_source_clocks = omap4_dm_source_clocks;
765 }
766
767 if (cpu_class_is_omap2())
768 for (i = 0; dm_source_names[i] != NULL; i++)
769 dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
770
771 if (cpu_is_omap243x())
772 dm_timers[0].phys_base = 0x49018000;
773
774 for (i = 0; i < dm_timer_count; i++) {
775 timer = &dm_timers[i];
776
777 /* Static mapping, never released */
778 timer->io_base = ioremap(timer->phys_base, map_size);
779 BUG_ON(!timer->io_base);
780
781 #ifdef CONFIG_ARCH_OMAP2PLUS
782 if (cpu_class_is_omap2()) {
783 char clk_name[16];
784 sprintf(clk_name, "gpt%d_ick", i + 1);
785 timer->iclk = clk_get(NULL, clk_name);
786 sprintf(clk_name, "gpt%d_fck", i + 1);
787 timer->fclk = clk_get(NULL, clk_name);
788 }
789 #endif
790 }
791
792 return 0;
793 }
Linux kernel - Deliverables
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