diff options
author | Peter Korsgaard <jacmet@sunsite.dk> | 2009-07-01 11:47:07 -0400 |
---|---|---|
committer | Ben Dooks <ben-linux@fluff.org> | 2009-07-30 19:10:24 -0400 |
commit | b5ead1cda64336b589eb4353e00f69c818fb6603 (patch) | |
tree | 75710d24405a28dd7f02d07eb31ce6d0197f0475 /arch/arm/plat-s3c24xx | |
parent | 14077ea63b5aea1db0142c1085d24aa0d11b9d36 (diff) |
ARM: S3C: move timer/pwm handling from plat-s3c24xx to plat-s3c
The s3c64xx devices use the same hardware core as s3c24xx, so move
the timer/pwm handling to plat-s3c so it can be used by both.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-s3c24xx')
-rw-r--r-- | arch/arm/plat-s3c24xx/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/plat-s3c24xx/pwm.c | 405 |
2 files changed, 0 insertions, 406 deletions
diff --git a/arch/arm/plat-s3c24xx/Makefile b/arch/arm/plat-s3c24xx/Makefile index 579a165c2827..0807831c9927 100644 --- a/arch/arm/plat-s3c24xx/Makefile +++ b/arch/arm/plat-s3c24xx/Makefile | |||
@@ -29,7 +29,6 @@ obj-$(CONFIG_PM_SIMTEC) += pm-simtec.o | |||
29 | obj-$(CONFIG_PM) += pm.o | 29 | obj-$(CONFIG_PM) += pm.o |
30 | obj-$(CONFIG_PM) += irq-pm.o | 30 | obj-$(CONFIG_PM) += irq-pm.o |
31 | obj-$(CONFIG_PM) += sleep.o | 31 | obj-$(CONFIG_PM) += sleep.o |
32 | obj-$(CONFIG_S3C24XX_PWM) += pwm.o | ||
33 | obj-$(CONFIG_S3C2410_CLOCK) += s3c2410-clock.o | 32 | obj-$(CONFIG_S3C2410_CLOCK) += s3c2410-clock.o |
34 | obj-$(CONFIG_S3C2410_DMA) += dma.o | 33 | obj-$(CONFIG_S3C2410_DMA) += dma.o |
35 | obj-$(CONFIG_S3C24XX_ADC) += adc.o | 34 | obj-$(CONFIG_S3C24XX_ADC) += adc.o |
diff --git a/arch/arm/plat-s3c24xx/pwm.c b/arch/arm/plat-s3c24xx/pwm.c deleted file mode 100644 index 0120b760315b..000000000000 --- a/arch/arm/plat-s3c24xx/pwm.c +++ /dev/null | |||
@@ -1,405 +0,0 @@ | |||
1 | /* arch/arm/plat-s3c24xx/pwm.c | ||
2 | * | ||
3 | * Copyright (c) 2007 Ben Dooks | ||
4 | * Copyright (c) 2008 Simtec Electronics | ||
5 | * Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org> | ||
6 | * | ||
7 | * S3C24XX PWM device core | ||
8 | * | ||
9 | * This program is free software; you can redistribute it and/or modify | ||
10 | * it under the terms of the GNU General Public License as published by | ||
11 | * the Free Software Foundation; either version 2 of the License. | ||
12 | */ | ||
13 | |||
14 | #include <linux/module.h> | ||
15 | #include <linux/kernel.h> | ||
16 | #include <linux/platform_device.h> | ||
17 | #include <linux/err.h> | ||
18 | #include <linux/clk.h> | ||
19 | #include <linux/io.h> | ||
20 | #include <linux/pwm.h> | ||
21 | |||
22 | #include <mach/irqs.h> | ||
23 | |||
24 | #include <plat/devs.h> | ||
25 | #include <plat/regs-timer.h> | ||
26 | |||
27 | struct pwm_device { | ||
28 | struct list_head list; | ||
29 | struct platform_device *pdev; | ||
30 | |||
31 | struct clk *clk_div; | ||
32 | struct clk *clk; | ||
33 | const char *label; | ||
34 | |||
35 | unsigned int period_ns; | ||
36 | unsigned int duty_ns; | ||
37 | |||
38 | unsigned char tcon_base; | ||
39 | unsigned char running; | ||
40 | unsigned char use_count; | ||
41 | unsigned char pwm_id; | ||
42 | }; | ||
43 | |||
44 | #define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg) | ||
45 | |||
46 | static struct clk *clk_scaler[2]; | ||
47 | |||
48 | /* Standard setup for a timer block. */ | ||
49 | |||
50 | #define TIMER_RESOURCE_SIZE (1) | ||
51 | |||
52 | #define TIMER_RESOURCE(_tmr, _irq) \ | ||
53 | (struct resource [TIMER_RESOURCE_SIZE]) { \ | ||
54 | [0] = { \ | ||
55 | .start = _irq, \ | ||
56 | .end = _irq, \ | ||
57 | .flags = IORESOURCE_IRQ \ | ||
58 | } \ | ||
59 | } | ||
60 | |||
61 | #define DEFINE_S3C_TIMER(_tmr_no, _irq) \ | ||
62 | .name = "s3c24xx-pwm", \ | ||
63 | .id = _tmr_no, \ | ||
64 | .num_resources = TIMER_RESOURCE_SIZE, \ | ||
65 | .resource = TIMER_RESOURCE(_tmr_no, _irq), \ | ||
66 | |||
67 | /* since we already have an static mapping for the timer, we do not | ||
68 | * bother setting any IO resource for the base. | ||
69 | */ | ||
70 | |||
71 | struct platform_device s3c_device_timer[] = { | ||
72 | [0] = { DEFINE_S3C_TIMER(0, IRQ_TIMER0) }, | ||
73 | [1] = { DEFINE_S3C_TIMER(1, IRQ_TIMER1) }, | ||
74 | [2] = { DEFINE_S3C_TIMER(2, IRQ_TIMER2) }, | ||
75 | [3] = { DEFINE_S3C_TIMER(3, IRQ_TIMER3) }, | ||
76 | [4] = { DEFINE_S3C_TIMER(4, IRQ_TIMER4) }, | ||
77 | }; | ||
78 | |||
79 | static inline int pwm_is_tdiv(struct pwm_device *pwm) | ||
80 | { | ||
81 | return clk_get_parent(pwm->clk) == pwm->clk_div; | ||
82 | } | ||
83 | |||
84 | static DEFINE_MUTEX(pwm_lock); | ||
85 | static LIST_HEAD(pwm_list); | ||
86 | |||
87 | struct pwm_device *pwm_request(int pwm_id, const char *label) | ||
88 | { | ||
89 | struct pwm_device *pwm; | ||
90 | int found = 0; | ||
91 | |||
92 | mutex_lock(&pwm_lock); | ||
93 | |||
94 | list_for_each_entry(pwm, &pwm_list, list) { | ||
95 | if (pwm->pwm_id == pwm_id) { | ||
96 | found = 1; | ||
97 | break; | ||
98 | } | ||
99 | } | ||
100 | |||
101 | if (found) { | ||
102 | if (pwm->use_count == 0) { | ||
103 | pwm->use_count = 1; | ||
104 | pwm->label = label; | ||
105 | } else | ||
106 | pwm = ERR_PTR(-EBUSY); | ||
107 | } else | ||
108 | pwm = ERR_PTR(-ENOENT); | ||
109 | |||
110 | mutex_unlock(&pwm_lock); | ||
111 | return pwm; | ||
112 | } | ||
113 | |||
114 | EXPORT_SYMBOL(pwm_request); | ||
115 | |||
116 | |||
117 | void pwm_free(struct pwm_device *pwm) | ||
118 | { | ||
119 | mutex_lock(&pwm_lock); | ||
120 | |||
121 | if (pwm->use_count) { | ||
122 | pwm->use_count--; | ||
123 | pwm->label = NULL; | ||
124 | } else | ||
125 | printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id); | ||
126 | |||
127 | mutex_unlock(&pwm_lock); | ||
128 | } | ||
129 | |||
130 | EXPORT_SYMBOL(pwm_free); | ||
131 | |||
132 | #define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0)) | ||
133 | #define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2)) | ||
134 | #define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3)) | ||
135 | #define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1)) | ||
136 | |||
137 | int pwm_enable(struct pwm_device *pwm) | ||
138 | { | ||
139 | unsigned long flags; | ||
140 | unsigned long tcon; | ||
141 | |||
142 | local_irq_save(flags); | ||
143 | |||
144 | tcon = __raw_readl(S3C2410_TCON); | ||
145 | tcon |= pwm_tcon_start(pwm); | ||
146 | __raw_writel(tcon, S3C2410_TCON); | ||
147 | |||
148 | local_irq_restore(flags); | ||
149 | |||
150 | pwm->running = 1; | ||
151 | return 0; | ||
152 | } | ||
153 | |||
154 | EXPORT_SYMBOL(pwm_enable); | ||
155 | |||
156 | void pwm_disable(struct pwm_device *pwm) | ||
157 | { | ||
158 | unsigned long flags; | ||
159 | unsigned long tcon; | ||
160 | |||
161 | local_irq_save(flags); | ||
162 | |||
163 | tcon = __raw_readl(S3C2410_TCON); | ||
164 | tcon &= ~pwm_tcon_start(pwm); | ||
165 | __raw_writel(tcon, S3C2410_TCON); | ||
166 | |||
167 | local_irq_restore(flags); | ||
168 | |||
169 | pwm->running = 0; | ||
170 | } | ||
171 | |||
172 | EXPORT_SYMBOL(pwm_disable); | ||
173 | |||
174 | static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq) | ||
175 | { | ||
176 | unsigned long tin_parent_rate; | ||
177 | unsigned int div; | ||
178 | |||
179 | tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div)); | ||
180 | pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate); | ||
181 | |||
182 | for (div = 2; div <= 16; div *= 2) { | ||
183 | if ((tin_parent_rate / (div << 16)) < freq) | ||
184 | return tin_parent_rate / div; | ||
185 | } | ||
186 | |||
187 | return tin_parent_rate / 16; | ||
188 | } | ||
189 | |||
190 | #define NS_IN_HZ (1000000000UL) | ||
191 | |||
192 | int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) | ||
193 | { | ||
194 | unsigned long tin_rate; | ||
195 | unsigned long tin_ns; | ||
196 | unsigned long period; | ||
197 | unsigned long flags; | ||
198 | unsigned long tcon; | ||
199 | unsigned long tcnt; | ||
200 | long tcmp; | ||
201 | |||
202 | /* We currently avoid using 64bit arithmetic by using the | ||
203 | * fact that anything faster than 1Hz is easily representable | ||
204 | * by 32bits. */ | ||
205 | |||
206 | if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ) | ||
207 | return -ERANGE; | ||
208 | |||
209 | if (duty_ns > period_ns) | ||
210 | return -EINVAL; | ||
211 | |||
212 | if (period_ns == pwm->period_ns && | ||
213 | duty_ns == pwm->duty_ns) | ||
214 | return 0; | ||
215 | |||
216 | /* The TCMP and TCNT can be read without a lock, they're not | ||
217 | * shared between the timers. */ | ||
218 | |||
219 | tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id)); | ||
220 | tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id)); | ||
221 | |||
222 | period = NS_IN_HZ / period_ns; | ||
223 | |||
224 | pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n", | ||
225 | duty_ns, period_ns, period); | ||
226 | |||
227 | /* Check to see if we are changing the clock rate of the PWM */ | ||
228 | |||
229 | if (pwm->period_ns != period_ns) { | ||
230 | if (pwm_is_tdiv(pwm)) { | ||
231 | tin_rate = pwm_calc_tin(pwm, period); | ||
232 | clk_set_rate(pwm->clk_div, tin_rate); | ||
233 | } else | ||
234 | tin_rate = clk_get_rate(pwm->clk); | ||
235 | |||
236 | pwm->period_ns = period_ns; | ||
237 | |||
238 | pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate); | ||
239 | |||
240 | tin_ns = NS_IN_HZ / tin_rate; | ||
241 | tcnt = period_ns / tin_ns; | ||
242 | } else | ||
243 | tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk); | ||
244 | |||
245 | /* Note, counters count down */ | ||
246 | |||
247 | tcmp = duty_ns / tin_ns; | ||
248 | tcmp = tcnt - tcmp; | ||
249 | |||
250 | pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt); | ||
251 | |||
252 | if (tcmp < 0) | ||
253 | tcmp = 0; | ||
254 | |||
255 | /* Update the PWM register block. */ | ||
256 | |||
257 | local_irq_save(flags); | ||
258 | |||
259 | __raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id)); | ||
260 | __raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id)); | ||
261 | |||
262 | tcon = __raw_readl(S3C2410_TCON); | ||
263 | tcon |= pwm_tcon_manulupdate(pwm); | ||
264 | tcon |= pwm_tcon_autoreload(pwm); | ||
265 | __raw_writel(tcon, S3C2410_TCON); | ||
266 | |||
267 | tcon &= ~pwm_tcon_manulupdate(pwm); | ||
268 | __raw_writel(tcon, S3C2410_TCON); | ||
269 | |||
270 | local_irq_restore(flags); | ||
271 | |||
272 | return 0; | ||
273 | } | ||
274 | |||
275 | EXPORT_SYMBOL(pwm_config); | ||
276 | |||
277 | static int pwm_register(struct pwm_device *pwm) | ||
278 | { | ||
279 | pwm->duty_ns = -1; | ||
280 | pwm->period_ns = -1; | ||
281 | |||
282 | mutex_lock(&pwm_lock); | ||
283 | list_add_tail(&pwm->list, &pwm_list); | ||
284 | mutex_unlock(&pwm_lock); | ||
285 | |||
286 | return 0; | ||
287 | } | ||
288 | |||
289 | static int s3c_pwm_probe(struct platform_device *pdev) | ||
290 | { | ||
291 | struct device *dev = &pdev->dev; | ||
292 | struct pwm_device *pwm; | ||
293 | unsigned long flags; | ||
294 | unsigned long tcon; | ||
295 | unsigned int id = pdev->id; | ||
296 | int ret; | ||
297 | |||
298 | if (id == 4) { | ||
299 | dev_err(dev, "TIMER4 is currently not supported\n"); | ||
300 | return -ENXIO; | ||
301 | } | ||
302 | |||
303 | pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); | ||
304 | if (pwm == NULL) { | ||
305 | dev_err(dev, "failed to allocate pwm_device\n"); | ||
306 | return -ENOMEM; | ||
307 | } | ||
308 | |||
309 | pwm->pdev = pdev; | ||
310 | pwm->pwm_id = id; | ||
311 | |||
312 | /* calculate base of control bits in TCON */ | ||
313 | pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4; | ||
314 | |||
315 | pwm->clk = clk_get(dev, "pwm-tin"); | ||
316 | if (IS_ERR(pwm->clk)) { | ||
317 | dev_err(dev, "failed to get pwm tin clk\n"); | ||
318 | ret = PTR_ERR(pwm->clk); | ||
319 | goto err_alloc; | ||
320 | } | ||
321 | |||
322 | pwm->clk_div = clk_get(dev, "pwm-tdiv"); | ||
323 | if (IS_ERR(pwm->clk_div)) { | ||
324 | dev_err(dev, "failed to get pwm tdiv clk\n"); | ||
325 | ret = PTR_ERR(pwm->clk_div); | ||
326 | goto err_clk_tin; | ||
327 | } | ||
328 | |||
329 | local_irq_save(flags); | ||
330 | |||
331 | tcon = __raw_readl(S3C2410_TCON); | ||
332 | tcon |= pwm_tcon_invert(pwm); | ||
333 | __raw_writel(tcon, S3C2410_TCON); | ||
334 | |||
335 | local_irq_restore(flags); | ||
336 | |||
337 | |||
338 | ret = pwm_register(pwm); | ||
339 | if (ret) { | ||
340 | dev_err(dev, "failed to register pwm\n"); | ||
341 | goto err_clk_tdiv; | ||
342 | } | ||
343 | |||
344 | pwm_dbg(pwm, "config bits %02x\n", | ||
345 | (__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f); | ||
346 | |||
347 | dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n", | ||
348 | clk_get_rate(pwm->clk), | ||
349 | clk_get_rate(pwm->clk_div), | ||
350 | pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base); | ||
351 | |||
352 | platform_set_drvdata(pdev, pwm); | ||
353 | return 0; | ||
354 | |||
355 | err_clk_tdiv: | ||
356 | clk_put(pwm->clk_div); | ||
357 | |||
358 | err_clk_tin: | ||
359 | clk_put(pwm->clk); | ||
360 | |||
361 | err_alloc: | ||
362 | kfree(pwm); | ||
363 | return ret; | ||
364 | } | ||
365 | |||
366 | static int s3c_pwm_remove(struct platform_device *pdev) | ||
367 | { | ||
368 | struct pwm_device *pwm = platform_get_drvdata(pdev); | ||
369 | |||
370 | clk_put(pwm->clk_div); | ||
371 | clk_put(pwm->clk); | ||
372 | kfree(pwm); | ||
373 | |||
374 | return 0; | ||
375 | } | ||
376 | |||
377 | static struct platform_driver s3c_pwm_driver = { | ||
378 | .driver = { | ||
379 | .name = "s3c24xx-pwm", | ||
380 | .owner = THIS_MODULE, | ||
381 | }, | ||
382 | .probe = s3c_pwm_probe, | ||
383 | .remove = __devexit_p(s3c_pwm_remove), | ||
384 | }; | ||
385 | |||
386 | static int __init pwm_init(void) | ||
387 | { | ||
388 | int ret; | ||
389 | |||
390 | clk_scaler[0] = clk_get(NULL, "pwm-scaler0"); | ||
391 | clk_scaler[1] = clk_get(NULL, "pwm-scaler1"); | ||
392 | |||
393 | if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) { | ||
394 | printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__); | ||
395 | return -EINVAL; | ||
396 | } | ||
397 | |||
398 | ret = platform_driver_register(&s3c_pwm_driver); | ||
399 | if (ret) | ||
400 | printk(KERN_ERR "%s: failed to add pwm driver\n", __func__); | ||
401 | |||
402 | return ret; | ||
403 | } | ||
404 | |||
405 | arch_initcall(pwm_init); | ||