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arm: ep93xx: Add basic interrupt info
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / arm / plat-omap / dmtimer.c
blobee9f6ebba29b8a5479353e9c56bc9f839d8e0183
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_clkin_ck",
268 "sys_32k_ck",
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 /* Enable autoidle on OMAP2 / OMAP3 */
346 if (cpu_is_omap24xx() || cpu_is_omap34xx())
347 l |= 0x1 << 0;
348
349 /*
350 * Enable wake-up on OMAP2 CPUs.
351 */
352 if (cpu_class_is_omap2())
353 l |= 1 << 2;
354 omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
355
356 /* Match hardware reset default of posted mode */
357 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
358 OMAP_TIMER_CTRL_POSTED);
359 timer->posted = 1;
360 }
361
362 static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
363 {
364 omap_dm_timer_enable(timer);
365 omap_dm_timer_reset(timer);
366 }
367
368 struct omap_dm_timer *omap_dm_timer_request(void)
369 {
370 struct omap_dm_timer *timer = NULL;
371 unsigned long flags;
372 int i;
373
374 spin_lock_irqsave(&dm_timer_lock, flags);
375 for (i = 0; i < dm_timer_count; i++) {
376 if (dm_timers[i].reserved)
377 continue;
378
379 timer = &dm_timers[i];
380 timer->reserved = 1;
381 break;
382 }
383 spin_unlock_irqrestore(&dm_timer_lock, flags);
384
385 if (timer != NULL)
386 omap_dm_timer_prepare(timer);
387
388 return timer;
389 }
390 EXPORT_SYMBOL_GPL(omap_dm_timer_request);
391
392 struct omap_dm_timer *omap_dm_timer_request_specific(int id)
393 {
394 struct omap_dm_timer *timer;
395 unsigned long flags;
396
397 spin_lock_irqsave(&dm_timer_lock, flags);
398 if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
399 spin_unlock_irqrestore(&dm_timer_lock, flags);
400 printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
401 __FILE__, __LINE__, __func__, id);
402 dump_stack();
403 return NULL;
404 }
405
406 timer = &dm_timers[id-1];
407 timer->reserved = 1;
408 spin_unlock_irqrestore(&dm_timer_lock, flags);
409
410 omap_dm_timer_prepare(timer);
411
412 return timer;
413 }
414 EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
415
416 void omap_dm_timer_free(struct omap_dm_timer *timer)
417 {
418 omap_dm_timer_enable(timer);
419 omap_dm_timer_reset(timer);
420 omap_dm_timer_disable(timer);
421
422 WARN_ON(!timer->reserved);
423 timer->reserved = 0;
424 }
425 EXPORT_SYMBOL_GPL(omap_dm_timer_free);
426
427 void omap_dm_timer_enable(struct omap_dm_timer *timer)
428 {
429 if (timer->enabled)
430 return;
431
432 #ifdef CONFIG_ARCH_OMAP2PLUS
433 if (cpu_class_is_omap2()) {
434 clk_enable(timer->fclk);
435 clk_enable(timer->iclk);
436 }
437 #endif
438
439 timer->enabled = 1;
440 }
441 EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
442
443 void omap_dm_timer_disable(struct omap_dm_timer *timer)
444 {
445 if (!timer->enabled)
446 return;
447
448 #ifdef CONFIG_ARCH_OMAP2PLUS
449 if (cpu_class_is_omap2()) {
450 clk_disable(timer->iclk);
451 clk_disable(timer->fclk);
452 }
453 #endif
454
455 timer->enabled = 0;
456 }
457 EXPORT_SYMBOL_GPL(omap_dm_timer_disable);
458
459 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
460 {
461 return timer->irq;
462 }
463 EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
464
465 #if defined(CONFIG_ARCH_OMAP1)
466
467 /**
468 * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
469 * @inputmask: current value of idlect mask
470 */
471 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
472 {
473 int i;
474
475 /* If ARMXOR cannot be idled this function call is unnecessary */
476 if (!(inputmask & (1 << 1)))
477 return inputmask;
478
479 /* If any active timer is using ARMXOR return modified mask */
480 for (i = 0; i < dm_timer_count; i++) {
481 u32 l;
482
483 l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG);
484 if (l & OMAP_TIMER_CTRL_ST) {
485 if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
486 inputmask &= ~(1 << 1);
487 else
488 inputmask &= ~(1 << 2);
489 }
490 }
491
492 return inputmask;
493 }
494 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
495
496 #else
497
498 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
499 {
500 return timer->fclk;
501 }
502 EXPORT_SYMBOL_GPL(omap_dm_timer_get_fclk);
503
504 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
505 {
506 BUG();
507
508 return 0;
509 }
510 EXPORT_SYMBOL_GPL(omap_dm_timer_modify_idlect_mask);
511
512 #endif
513
514 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
515 {
516 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
517 }
518 EXPORT_SYMBOL_GPL(omap_dm_timer_trigger);
519
520 void omap_dm_timer_start(struct omap_dm_timer *timer)
521 {
522 u32 l;
523
524 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
525 if (!(l & OMAP_TIMER_CTRL_ST)) {
526 l |= OMAP_TIMER_CTRL_ST;
527 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
528 }
529 }
530 EXPORT_SYMBOL_GPL(omap_dm_timer_start);
531
532 void omap_dm_timer_stop(struct omap_dm_timer *timer)
533 {
534 u32 l;
535
536 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
537 if (l & OMAP_TIMER_CTRL_ST) {
538 l &= ~0x1;
539 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
540 #ifdef CONFIG_ARCH_OMAP2PLUS
541 /* Readback to make sure write has completed */
542 omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
543 /*
544 * Wait for functional clock period x 3.5 to make sure that
545 * timer is stopped
546 */
547 udelay(3500000 / clk_get_rate(timer->fclk) + 1);
548 #endif
549 }
550 /* Ack possibly pending interrupt */
551 omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG,
552 OMAP_TIMER_INT_OVERFLOW);
553 }
554 EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
555
556 #ifdef CONFIG_ARCH_OMAP1
557
558 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
559 {
560 int n = (timer - dm_timers) << 1;
561 u32 l;
562
563 l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
564 l |= source << n;
565 omap_writel(l, MOD_CONF_CTRL_1);
566
567 return 0;
568 }
569 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
570
571 #else
572
573 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
574 {
575 int ret = -EINVAL;
576
577 if (source < 0 || source >= 3)
578 return -EINVAL;
579
580 clk_disable(timer->fclk);
581 ret = clk_set_parent(timer->fclk, dm_source_clocks[source]);
582 clk_enable(timer->fclk);
583
584 /*
585 * When the functional clock disappears, too quick writes seem
586 * to cause an abort. XXX Is this still necessary?
587 */
588 __delay(300000);
589
590 return ret;
591 }
592 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
593
594 #endif
595
596 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
597 unsigned int load)
598 {
599 u32 l;
600
601 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
602 if (autoreload)
603 l |= OMAP_TIMER_CTRL_AR;
604 else
605 l &= ~OMAP_TIMER_CTRL_AR;
606 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
607 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
608
609 omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
610 }
611 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
612
613 /* Optimized set_load which removes costly spin wait in timer_start */
614 void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
615 unsigned int load)
616 {
617 u32 l;
618
619 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
620 if (autoreload) {
621 l |= OMAP_TIMER_CTRL_AR;
622 omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
623 } else {
624 l &= ~OMAP_TIMER_CTRL_AR;
625 }
626 l |= OMAP_TIMER_CTRL_ST;
627
628 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, load);
629 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
630 }
631 EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
632
633 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
634 unsigned int match)
635 {
636 u32 l;
637
638 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
639 if (enable)
640 l |= OMAP_TIMER_CTRL_CE;
641 else
642 l &= ~OMAP_TIMER_CTRL_CE;
643 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
644 omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
645 }
646 EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
647
648 void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
649 int toggle, int trigger)
650 {
651 u32 l;
652
653 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
654 l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
655 OMAP_TIMER_CTRL_PT | (0x03 << 10));
656 if (def_on)
657 l |= OMAP_TIMER_CTRL_SCPWM;
658 if (toggle)
659 l |= OMAP_TIMER_CTRL_PT;
660 l |= trigger << 10;
661 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
662 }
663 EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
664
665 void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
666 {
667 u32 l;
668
669 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
670 l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
671 if (prescaler >= 0x00 && prescaler <= 0x07) {
672 l |= OMAP_TIMER_CTRL_PRE;
673 l |= prescaler << 2;
674 }
675 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
676 }
677 EXPORT_SYMBOL_GPL(omap_dm_timer_set_prescaler);
678
679 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
680 unsigned int value)
681 {
682 omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
683 omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
684 }
685 EXPORT_SYMBOL_GPL(omap_dm_timer_set_int_enable);
686
687 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
688 {
689 unsigned int l;
690
691 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
692
693 return l;
694 }
695 EXPORT_SYMBOL_GPL(omap_dm_timer_read_status);
696
697 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
698 {
699 omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
700 }
701 EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);
702
703 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
704 {
705 unsigned int l;
706
707 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
708
709 return l;
710 }
711 EXPORT_SYMBOL_GPL(omap_dm_timer_read_counter);
712
713 void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
714 {
715 omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
716 }
717 EXPORT_SYMBOL_GPL(omap_dm_timer_write_counter);
718
719 int omap_dm_timers_active(void)
720 {
721 int i;
722
723 for (i = 0; i < dm_timer_count; i++) {
724 struct omap_dm_timer *timer;
725
726 timer = &dm_timers[i];
727
728 if (!timer->enabled)
729 continue;
730
731 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
732 OMAP_TIMER_CTRL_ST) {
733 return 1;
734 }
735 }
736 return 0;
737 }
738 EXPORT_SYMBOL_GPL(omap_dm_timers_active);
739
740 int __init omap_dm_timer_init(void)
741 {
742 struct omap_dm_timer *timer;
743 int i, map_size = SZ_8K; /* Module 4KB + L4 4KB except on omap1 */
744
745 if (!(cpu_is_omap16xx() || cpu_class_is_omap2()))
746 return -ENODEV;
747
748 spin_lock_init(&dm_timer_lock);
749
750 if (cpu_class_is_omap1()) {
751 dm_timers = omap1_dm_timers;
752 dm_timer_count = omap1_dm_timer_count;
753 map_size = SZ_2K;
754 } else if (cpu_is_omap24xx()) {
755 dm_timers = omap2_dm_timers;
756 dm_timer_count = omap2_dm_timer_count;
757 dm_source_names = omap2_dm_source_names;
758 dm_source_clocks = omap2_dm_source_clocks;
759 } else if (cpu_is_omap34xx()) {
760 dm_timers = omap3_dm_timers;
761 dm_timer_count = omap3_dm_timer_count;
762 dm_source_names = omap3_dm_source_names;
763 dm_source_clocks = omap3_dm_source_clocks;
764 } else if (cpu_is_omap44xx()) {
765 dm_timers = omap4_dm_timers;
766 dm_timer_count = omap4_dm_timer_count;
767 dm_source_names = omap4_dm_source_names;
768 dm_source_clocks = omap4_dm_source_clocks;
769 }
770
771 if (cpu_class_is_omap2())
772 for (i = 0; dm_source_names[i] != NULL; i++)
773 dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
774
775 if (cpu_is_omap243x())
776 dm_timers[0].phys_base = 0x49018000;
777
778 for (i = 0; i < dm_timer_count; i++) {
779 timer = &dm_timers[i];
780
781 /* Static mapping, never released */
782 timer->io_base = ioremap(timer->phys_base, map_size);
783 BUG_ON(!timer->io_base);
784
785 #ifdef CONFIG_ARCH_OMAP2PLUS
786 if (cpu_class_is_omap2()) {
787 char clk_name[16];
788 sprintf(clk_name, "gpt%d_ick", i + 1);
789 timer->iclk = clk_get(NULL, clk_name);
790 sprintf(clk_name, "gpt%d_fck", i + 1);
791 timer->fclk = clk_get(NULL, clk_name);
792 }
793 #endif
794 }
795
796 return 0;
797 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree