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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Overkiz SAS 2012
4 *
5 * Author: Boris BREZILLON <b.brezillon@overkiz.com>
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/clocksource.h>
11#include <linux/clockchips.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/ioport.h>
18#include <linux/io.h>
19#include <linux/mfd/syscon.h>
20#include <linux/platform_device.h>
21#include <linux/pwm.h>
22#include <linux/of_device.h>
23#include <linux/of_irq.h>
24#include <linux/regmap.h>
25#include <linux/slab.h>
26#include <soc/at91/atmel_tcb.h>
27
28#define NPWM 2
29
30#define ATMEL_TC_ACMR_MASK (ATMEL_TC_ACPA | ATMEL_TC_ACPC | \
31 ATMEL_TC_AEEVT | ATMEL_TC_ASWTRG)
32
33#define ATMEL_TC_BCMR_MASK (ATMEL_TC_BCPB | ATMEL_TC_BCPC | \
34 ATMEL_TC_BEEVT | ATMEL_TC_BSWTRG)
35
36struct atmel_tcb_pwm_device {
37 enum pwm_polarity polarity; /* PWM polarity */
38 unsigned div; /* PWM clock divider */
39 unsigned duty; /* PWM duty expressed in clk cycles */
40 unsigned period; /* PWM period expressed in clk cycles */
41};
42
43struct atmel_tcb_channel {
44 u32 enabled;
45 u32 cmr;
46 u32 ra;
47 u32 rb;
48 u32 rc;
49};
50
51struct atmel_tcb_pwm_chip {
52 struct pwm_chip chip;
53 spinlock_t lock;
54 u8 channel;
55 u8 width;
56 struct regmap *regmap;
57 struct clk *clk;
58 struct clk *gclk;
59 struct clk *slow_clk;
60 struct atmel_tcb_pwm_device *pwms[NPWM];
61 struct atmel_tcb_channel bkup;
62};
63
64static const u8 atmel_tcb_divisors[] = { 2, 8, 32, 128, 0, };
65
66static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
67{
68 return container_of(chip, struct atmel_tcb_pwm_chip, chip);
69}
70
71static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
72 struct pwm_device *pwm,
73 enum pwm_polarity polarity)
74{
75 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
76 struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
77
78 tcbpwm->polarity = polarity;
79
80 return 0;
81}
82
83static int atmel_tcb_pwm_request(struct pwm_chip *chip,
84 struct pwm_device *pwm)
85{
86 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
87 struct atmel_tcb_pwm_device *tcbpwm;
88 unsigned cmr;
89 int ret;
90
91 tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL);
92 if (!tcbpwm)
93 return -ENOMEM;
94
95 ret = clk_prepare_enable(tcbpwmc->clk);
96 if (ret) {
97 devm_kfree(chip->dev, tcbpwm);
98 return ret;
99 }
100
101 tcbpwm->polarity = PWM_POLARITY_NORMAL;
102 tcbpwm->duty = 0;
103 tcbpwm->period = 0;
104 tcbpwm->div = 0;
105
106 spin_lock(&tcbpwmc->lock);
107 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
108 /*
109 * Get init config from Timer Counter registers if
110 * Timer Counter is already configured as a PWM generator.
111 */
112 if (cmr & ATMEL_TC_WAVE) {
113 if (pwm->hwpwm == 0)
114 regmap_read(tcbpwmc->regmap,
115 ATMEL_TC_REG(tcbpwmc->channel, RA),
116 &tcbpwm->duty);
117 else
118 regmap_read(tcbpwmc->regmap,
119 ATMEL_TC_REG(tcbpwmc->channel, RB),
120 &tcbpwm->duty);
121
122 tcbpwm->div = cmr & ATMEL_TC_TCCLKS;
123 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
124 &tcbpwm->period);
125 cmr &= (ATMEL_TC_TCCLKS | ATMEL_TC_ACMR_MASK |
126 ATMEL_TC_BCMR_MASK);
127 } else
128 cmr = 0;
129
130 cmr |= ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO | ATMEL_TC_EEVT_XC0;
131 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
132 spin_unlock(&tcbpwmc->lock);
133
134 tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
135
136 return 0;
137}
138
139static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
140{
141 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
142 struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
143
144 clk_disable_unprepare(tcbpwmc->clk);
145 tcbpwmc->pwms[pwm->hwpwm] = NULL;
146 devm_kfree(chip->dev, tcbpwm);
147}
148
149static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
150{
151 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
152 struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
153 unsigned cmr;
154 enum pwm_polarity polarity = tcbpwm->polarity;
155
156 /*
157 * If duty is 0 the timer will be stopped and we have to
158 * configure the output correctly on software trigger:
159 * - set output to high if PWM_POLARITY_INVERSED
160 * - set output to low if PWM_POLARITY_NORMAL
161 *
162 * This is why we're reverting polarity in this case.
163 */
164 if (tcbpwm->duty == 0)
165 polarity = !polarity;
166
167 spin_lock(&tcbpwmc->lock);
168 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
169
170 /* flush old setting and set the new one */
171 if (pwm->hwpwm == 0) {
172 cmr &= ~ATMEL_TC_ACMR_MASK;
173 if (polarity == PWM_POLARITY_INVERSED)
174 cmr |= ATMEL_TC_ASWTRG_CLEAR;
175 else
176 cmr |= ATMEL_TC_ASWTRG_SET;
177 } else {
178 cmr &= ~ATMEL_TC_BCMR_MASK;
179 if (polarity == PWM_POLARITY_INVERSED)
180 cmr |= ATMEL_TC_BSWTRG_CLEAR;
181 else
182 cmr |= ATMEL_TC_BSWTRG_SET;
183 }
184
185 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
186
187 /*
188 * Use software trigger to apply the new setting.
189 * If both PWM devices in this group are disabled we stop the clock.
190 */
191 if (!(cmr & (ATMEL_TC_ACPC | ATMEL_TC_BCPC))) {
192 regmap_write(tcbpwmc->regmap,
193 ATMEL_TC_REG(tcbpwmc->channel, CCR),
194 ATMEL_TC_SWTRG | ATMEL_TC_CLKDIS);
195 tcbpwmc->bkup.enabled = 1;
196 } else {
197 regmap_write(tcbpwmc->regmap,
198 ATMEL_TC_REG(tcbpwmc->channel, CCR),
199 ATMEL_TC_SWTRG);
200 tcbpwmc->bkup.enabled = 0;
201 }
202
203 spin_unlock(&tcbpwmc->lock);
204}
205
206static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
207{
208 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
209 struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
210 u32 cmr;
211 enum pwm_polarity polarity = tcbpwm->polarity;
212
213 /*
214 * If duty is 0 the timer will be stopped and we have to
215 * configure the output correctly on software trigger:
216 * - set output to high if PWM_POLARITY_INVERSED
217 * - set output to low if PWM_POLARITY_NORMAL
218 *
219 * This is why we're reverting polarity in this case.
220 */
221 if (tcbpwm->duty == 0)
222 polarity = !polarity;
223
224 spin_lock(&tcbpwmc->lock);
225 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
226
227 /* flush old setting and set the new one */
228 cmr &= ~ATMEL_TC_TCCLKS;
229
230 if (pwm->hwpwm == 0) {
231 cmr &= ~ATMEL_TC_ACMR_MASK;
232
233 /* Set CMR flags according to given polarity */
234 if (polarity == PWM_POLARITY_INVERSED)
235 cmr |= ATMEL_TC_ASWTRG_CLEAR;
236 else
237 cmr |= ATMEL_TC_ASWTRG_SET;
238 } else {
239 cmr &= ~ATMEL_TC_BCMR_MASK;
240 if (polarity == PWM_POLARITY_INVERSED)
241 cmr |= ATMEL_TC_BSWTRG_CLEAR;
242 else
243 cmr |= ATMEL_TC_BSWTRG_SET;
244 }
245
246 /*
247 * If duty is 0 or equal to period there's no need to register
248 * a specific action on RA/RB and RC compare.
249 * The output will be configured on software trigger and keep
250 * this config till next config call.
251 */
252 if (tcbpwm->duty != tcbpwm->period && tcbpwm->duty > 0) {
253 if (pwm->hwpwm == 0) {
254 if (polarity == PWM_POLARITY_INVERSED)
255 cmr |= ATMEL_TC_ACPA_SET | ATMEL_TC_ACPC_CLEAR;
256 else
257 cmr |= ATMEL_TC_ACPA_CLEAR | ATMEL_TC_ACPC_SET;
258 } else {
259 if (polarity == PWM_POLARITY_INVERSED)
260 cmr |= ATMEL_TC_BCPB_SET | ATMEL_TC_BCPC_CLEAR;
261 else
262 cmr |= ATMEL_TC_BCPB_CLEAR | ATMEL_TC_BCPC_SET;
263 }
264 }
265
266 cmr |= (tcbpwm->div & ATMEL_TC_TCCLKS);
267
268 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
269
270 if (pwm->hwpwm == 0)
271 regmap_write(tcbpwmc->regmap,
272 ATMEL_TC_REG(tcbpwmc->channel, RA),
273 tcbpwm->duty);
274 else
275 regmap_write(tcbpwmc->regmap,
276 ATMEL_TC_REG(tcbpwmc->channel, RB),
277 tcbpwm->duty);
278
279 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
280 tcbpwm->period);
281
282 /* Use software trigger to apply the new setting */
283 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CCR),
284 ATMEL_TC_SWTRG | ATMEL_TC_CLKEN);
285 tcbpwmc->bkup.enabled = 1;
286 spin_unlock(&tcbpwmc->lock);
287 return 0;
288}
289
290static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
291 int duty_ns, int period_ns)
292{
293 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
294 struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
295 struct atmel_tcb_pwm_device *atcbpwm = NULL;
296 int i = 0;
297 int slowclk = 0;
298 unsigned period;
299 unsigned duty;
300 unsigned rate = clk_get_rate(tcbpwmc->clk);
301 unsigned long long min;
302 unsigned long long max;
303
304 /*
305 * Find best clk divisor:
306 * the smallest divisor which can fulfill the period_ns requirements.
307 * If there is a gclk, the first divisor is actually the gclk selector
308 */
309 if (tcbpwmc->gclk)
310 i = 1;
311 for (; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) {
312 if (atmel_tcb_divisors[i] == 0) {
313 slowclk = i;
314 continue;
315 }
316 min = div_u64((u64)NSEC_PER_SEC * atmel_tcb_divisors[i], rate);
317 max = min << tcbpwmc->width;
318 if (max >= period_ns)
319 break;
320 }
321
322 /*
323 * If none of the divisor are small enough to represent period_ns
324 * take slow clock (32KHz).
325 */
326 if (i == ARRAY_SIZE(atmel_tcb_divisors)) {
327 i = slowclk;
328 rate = clk_get_rate(tcbpwmc->slow_clk);
329 min = div_u64(NSEC_PER_SEC, rate);
330 max = min << tcbpwmc->width;
331
332 /* If period is too big return ERANGE error */
333 if (max < period_ns)
334 return -ERANGE;
335 }
336
337 duty = div_u64(duty_ns, min);
338 period = div_u64(period_ns, min);
339
340 if (pwm->hwpwm == 0)
341 atcbpwm = tcbpwmc->pwms[1];
342 else
343 atcbpwm = tcbpwmc->pwms[0];
344
345 /*
346 * PWM devices provided by the TCB driver are grouped by 2.
347 * PWM devices in a given group must be configured with the
348 * same period_ns.
349 *
350 * We're checking the period value of the second PWM device
351 * in this group before applying the new config.
352 */
353 if ((atcbpwm && atcbpwm->duty > 0 &&
354 atcbpwm->duty != atcbpwm->period) &&
355 (atcbpwm->div != i || atcbpwm->period != period)) {
356 dev_err(chip->dev,
357 "failed to configure period_ns: PWM group already configured with a different value\n");
358 return -EINVAL;
359 }
360
361 tcbpwm->period = period;
362 tcbpwm->div = i;
363 tcbpwm->duty = duty;
364
365 return 0;
366}
367
368static int atmel_tcb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
369 const struct pwm_state *state)
370{
371 int duty_cycle, period;
372 int ret;
373
374 /* This function only sets a flag in driver data */
375 atmel_tcb_pwm_set_polarity(chip, pwm, state->polarity);
376
377 if (!state->enabled) {
378 atmel_tcb_pwm_disable(chip, pwm);
379 return 0;
380 }
381
382 period = state->period < INT_MAX ? state->period : INT_MAX;
383 duty_cycle = state->duty_cycle < INT_MAX ? state->duty_cycle : INT_MAX;
384
385 ret = atmel_tcb_pwm_config(chip, pwm, duty_cycle, period);
386 if (ret)
387 return ret;
388
389 return atmel_tcb_pwm_enable(chip, pwm);
390}
391
392static const struct pwm_ops atmel_tcb_pwm_ops = {
393 .request = atmel_tcb_pwm_request,
394 .free = atmel_tcb_pwm_free,
395 .apply = atmel_tcb_pwm_apply,
396 .owner = THIS_MODULE,
397};
398
399static struct atmel_tcb_config tcb_rm9200_config = {
400 .counter_width = 16,
401};
402
403static struct atmel_tcb_config tcb_sam9x5_config = {
404 .counter_width = 32,
405};
406
407static struct atmel_tcb_config tcb_sama5d2_config = {
408 .counter_width = 32,
409 .has_gclk = 1,
410};
411
412static const struct of_device_id atmel_tcb_of_match[] = {
413 { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
414 { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
415 { .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },
416 { /* sentinel */ }
417};
418
419static int atmel_tcb_pwm_probe(struct platform_device *pdev)
420{
421 const struct of_device_id *match;
422 struct atmel_tcb_pwm_chip *tcbpwm;
423 const struct atmel_tcb_config *config;
424 struct device_node *np = pdev->dev.of_node;
425 struct regmap *regmap;
426 struct clk *clk, *gclk = NULL;
427 struct clk *slow_clk;
428 char clk_name[] = "t0_clk";
429 int err;
430 int channel;
431
432 err = of_property_read_u32(np, "reg", &channel);
433 if (err < 0) {
434 dev_err(&pdev->dev,
435 "failed to get Timer Counter Block channel from device tree (error: %d)\n",
436 err);
437 return err;
438 }
439
440 regmap = syscon_node_to_regmap(np->parent);
441 if (IS_ERR(regmap))
442 return PTR_ERR(regmap);
443
444 slow_clk = of_clk_get_by_name(np->parent, "slow_clk");
445 if (IS_ERR(slow_clk))
446 return PTR_ERR(slow_clk);
447
448 clk_name[1] += channel;
449 clk = of_clk_get_by_name(np->parent, clk_name);
450 if (IS_ERR(clk))
451 clk = of_clk_get_by_name(np->parent, "t0_clk");
452 if (IS_ERR(clk))
453 return PTR_ERR(clk);
454
455 match = of_match_node(atmel_tcb_of_match, np->parent);
456 config = match->data;
457
458 if (config->has_gclk) {
459 gclk = of_clk_get_by_name(np->parent, "gclk");
460 if (IS_ERR(gclk))
461 return PTR_ERR(gclk);
462 }
463
464 tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
465 if (tcbpwm == NULL) {
466 err = -ENOMEM;
467 goto err_slow_clk;
468 }
469
470 tcbpwm->chip.dev = &pdev->dev;
471 tcbpwm->chip.ops = &atmel_tcb_pwm_ops;
472 tcbpwm->chip.npwm = NPWM;
473 tcbpwm->channel = channel;
474 tcbpwm->regmap = regmap;
475 tcbpwm->clk = clk;
476 tcbpwm->gclk = gclk;
477 tcbpwm->slow_clk = slow_clk;
478 tcbpwm->width = config->counter_width;
479
480 err = clk_prepare_enable(slow_clk);
481 if (err)
482 goto err_slow_clk;
483
484 spin_lock_init(&tcbpwm->lock);
485
486 err = pwmchip_add(&tcbpwm->chip);
487 if (err < 0)
488 goto err_disable_clk;
489
490 platform_set_drvdata(pdev, tcbpwm);
491
492 return 0;
493
494err_disable_clk:
495 clk_disable_unprepare(tcbpwm->slow_clk);
496
497err_slow_clk:
498 clk_put(slow_clk);
499
500 return err;
501}
502
503static int atmel_tcb_pwm_remove(struct platform_device *pdev)
504{
505 struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
506
507 pwmchip_remove(&tcbpwm->chip);
508
509 clk_disable_unprepare(tcbpwm->slow_clk);
510 clk_put(tcbpwm->slow_clk);
511 clk_put(tcbpwm->clk);
512
513 return 0;
514}
515
516static const struct of_device_id atmel_tcb_pwm_dt_ids[] = {
517 { .compatible = "atmel,tcb-pwm", },
518 { /* sentinel */ }
519};
520MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
521
522#ifdef CONFIG_PM_SLEEP
523static int atmel_tcb_pwm_suspend(struct device *dev)
524{
525 struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
526 struct atmel_tcb_channel *chan = &tcbpwm->bkup;
527 unsigned int channel = tcbpwm->channel;
528
529 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), &chan->cmr);
530 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), &chan->ra);
531 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), &chan->rb);
532 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), &chan->rc);
533
534 return 0;
535}
536
537static int atmel_tcb_pwm_resume(struct device *dev)
538{
539 struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
540 struct atmel_tcb_channel *chan = &tcbpwm->bkup;
541 unsigned int channel = tcbpwm->channel;
542
543 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), chan->cmr);
544 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), chan->ra);
545 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), chan->rb);
546 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), chan->rc);
547
548 if (chan->enabled)
549 regmap_write(tcbpwm->regmap,
550 ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
551 ATMEL_TC_REG(channel, CCR));
552
553 return 0;
554}
555#endif
556
557static SIMPLE_DEV_PM_OPS(atmel_tcb_pwm_pm_ops, atmel_tcb_pwm_suspend,
558 atmel_tcb_pwm_resume);
559
560static struct platform_driver atmel_tcb_pwm_driver = {
561 .driver = {
562 .name = "atmel-tcb-pwm",
563 .of_match_table = atmel_tcb_pwm_dt_ids,
564 .pm = &atmel_tcb_pwm_pm_ops,
565 },
566 .probe = atmel_tcb_pwm_probe,
567 .remove = atmel_tcb_pwm_remove,
568};
569module_platform_driver(atmel_tcb_pwm_driver);
570
571MODULE_AUTHOR("Boris BREZILLON <b.brezillon@overkiz.com>");
572MODULE_DESCRIPTION("Atmel Timer Counter Pulse Width Modulation Driver");
573MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Overkiz SAS 2012
4 *
5 * Author: Boris BREZILLON <b.brezillon@overkiz.com>
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/clocksource.h>
11#include <linux/clockchips.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14
15#include <linux/clk.h>
16#include <linux/err.h>
17#include <linux/ioport.h>
18#include <linux/io.h>
19#include <linux/mfd/syscon.h>
20#include <linux/platform_device.h>
21#include <linux/pwm.h>
22#include <linux/of.h>
23#include <linux/regmap.h>
24#include <linux/slab.h>
25#include <soc/at91/atmel_tcb.h>
26
27#define NPWM 2
28
29#define ATMEL_TC_ACMR_MASK (ATMEL_TC_ACPA | ATMEL_TC_ACPC | \
30 ATMEL_TC_AEEVT | ATMEL_TC_ASWTRG)
31
32#define ATMEL_TC_BCMR_MASK (ATMEL_TC_BCPB | ATMEL_TC_BCPC | \
33 ATMEL_TC_BEEVT | ATMEL_TC_BSWTRG)
34
35struct atmel_tcb_pwm_device {
36 unsigned div; /* PWM clock divider */
37 unsigned duty; /* PWM duty expressed in clk cycles */
38 unsigned period; /* PWM period expressed in clk cycles */
39};
40
41struct atmel_tcb_channel {
42 u32 enabled;
43 u32 cmr;
44 u32 ra;
45 u32 rb;
46 u32 rc;
47};
48
49struct atmel_tcb_pwm_chip {
50 spinlock_t lock;
51 u8 channel;
52 u8 width;
53 struct regmap *regmap;
54 struct clk *clk;
55 struct clk *gclk;
56 struct clk *slow_clk;
57 struct atmel_tcb_pwm_device pwms[NPWM];
58 struct atmel_tcb_channel bkup;
59};
60
61static const u8 atmel_tcb_divisors[] = { 2, 8, 32, 128, 0, };
62
63static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
64{
65 return pwmchip_get_drvdata(chip);
66}
67
68static int atmel_tcb_pwm_request(struct pwm_chip *chip,
69 struct pwm_device *pwm)
70{
71 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
72 struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
73 unsigned cmr;
74 int ret;
75
76 ret = clk_prepare_enable(tcbpwmc->clk);
77 if (ret)
78 return ret;
79
80 tcbpwm->duty = 0;
81 tcbpwm->period = 0;
82 tcbpwm->div = 0;
83
84 spin_lock(&tcbpwmc->lock);
85 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
86 /*
87 * Get init config from Timer Counter registers if
88 * Timer Counter is already configured as a PWM generator.
89 */
90 if (cmr & ATMEL_TC_WAVE) {
91 if (pwm->hwpwm == 0)
92 regmap_read(tcbpwmc->regmap,
93 ATMEL_TC_REG(tcbpwmc->channel, RA),
94 &tcbpwm->duty);
95 else
96 regmap_read(tcbpwmc->regmap,
97 ATMEL_TC_REG(tcbpwmc->channel, RB),
98 &tcbpwm->duty);
99
100 tcbpwm->div = cmr & ATMEL_TC_TCCLKS;
101 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
102 &tcbpwm->period);
103 cmr &= (ATMEL_TC_TCCLKS | ATMEL_TC_ACMR_MASK |
104 ATMEL_TC_BCMR_MASK);
105 } else
106 cmr = 0;
107
108 cmr |= ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO | ATMEL_TC_EEVT_XC0;
109 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
110 spin_unlock(&tcbpwmc->lock);
111
112 return 0;
113}
114
115static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
116{
117 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
118
119 clk_disable_unprepare(tcbpwmc->clk);
120}
121
122static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm,
123 enum pwm_polarity polarity)
124{
125 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
126 struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
127 unsigned cmr;
128
129 /*
130 * If duty is 0 the timer will be stopped and we have to
131 * configure the output correctly on software trigger:
132 * - set output to high if PWM_POLARITY_INVERSED
133 * - set output to low if PWM_POLARITY_NORMAL
134 *
135 * This is why we're reverting polarity in this case.
136 */
137 if (tcbpwm->duty == 0)
138 polarity = !polarity;
139
140 spin_lock(&tcbpwmc->lock);
141 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
142
143 /* flush old setting and set the new one */
144 if (pwm->hwpwm == 0) {
145 cmr &= ~ATMEL_TC_ACMR_MASK;
146 if (polarity == PWM_POLARITY_INVERSED)
147 cmr |= ATMEL_TC_ASWTRG_CLEAR;
148 else
149 cmr |= ATMEL_TC_ASWTRG_SET;
150 } else {
151 cmr &= ~ATMEL_TC_BCMR_MASK;
152 if (polarity == PWM_POLARITY_INVERSED)
153 cmr |= ATMEL_TC_BSWTRG_CLEAR;
154 else
155 cmr |= ATMEL_TC_BSWTRG_SET;
156 }
157
158 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
159
160 /*
161 * Use software trigger to apply the new setting.
162 * If both PWM devices in this group are disabled we stop the clock.
163 */
164 if (!(cmr & (ATMEL_TC_ACPC | ATMEL_TC_BCPC))) {
165 regmap_write(tcbpwmc->regmap,
166 ATMEL_TC_REG(tcbpwmc->channel, CCR),
167 ATMEL_TC_SWTRG | ATMEL_TC_CLKDIS);
168 tcbpwmc->bkup.enabled = 1;
169 } else {
170 regmap_write(tcbpwmc->regmap,
171 ATMEL_TC_REG(tcbpwmc->channel, CCR),
172 ATMEL_TC_SWTRG);
173 tcbpwmc->bkup.enabled = 0;
174 }
175
176 spin_unlock(&tcbpwmc->lock);
177}
178
179static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm,
180 enum pwm_polarity polarity)
181{
182 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
183 struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
184 u32 cmr;
185
186 /*
187 * If duty is 0 the timer will be stopped and we have to
188 * configure the output correctly on software trigger:
189 * - set output to high if PWM_POLARITY_INVERSED
190 * - set output to low if PWM_POLARITY_NORMAL
191 *
192 * This is why we're reverting polarity in this case.
193 */
194 if (tcbpwm->duty == 0)
195 polarity = !polarity;
196
197 spin_lock(&tcbpwmc->lock);
198 regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
199
200 /* flush old setting and set the new one */
201 cmr &= ~ATMEL_TC_TCCLKS;
202
203 if (pwm->hwpwm == 0) {
204 cmr &= ~ATMEL_TC_ACMR_MASK;
205
206 /* Set CMR flags according to given polarity */
207 if (polarity == PWM_POLARITY_INVERSED)
208 cmr |= ATMEL_TC_ASWTRG_CLEAR;
209 else
210 cmr |= ATMEL_TC_ASWTRG_SET;
211 } else {
212 cmr &= ~ATMEL_TC_BCMR_MASK;
213 if (polarity == PWM_POLARITY_INVERSED)
214 cmr |= ATMEL_TC_BSWTRG_CLEAR;
215 else
216 cmr |= ATMEL_TC_BSWTRG_SET;
217 }
218
219 /*
220 * If duty is 0 or equal to period there's no need to register
221 * a specific action on RA/RB and RC compare.
222 * The output will be configured on software trigger and keep
223 * this config till next config call.
224 */
225 if (tcbpwm->duty != tcbpwm->period && tcbpwm->duty > 0) {
226 if (pwm->hwpwm == 0) {
227 if (polarity == PWM_POLARITY_INVERSED)
228 cmr |= ATMEL_TC_ACPA_SET | ATMEL_TC_ACPC_CLEAR;
229 else
230 cmr |= ATMEL_TC_ACPA_CLEAR | ATMEL_TC_ACPC_SET;
231 } else {
232 if (polarity == PWM_POLARITY_INVERSED)
233 cmr |= ATMEL_TC_BCPB_SET | ATMEL_TC_BCPC_CLEAR;
234 else
235 cmr |= ATMEL_TC_BCPB_CLEAR | ATMEL_TC_BCPC_SET;
236 }
237 }
238
239 cmr |= (tcbpwm->div & ATMEL_TC_TCCLKS);
240
241 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
242
243 if (pwm->hwpwm == 0)
244 regmap_write(tcbpwmc->regmap,
245 ATMEL_TC_REG(tcbpwmc->channel, RA),
246 tcbpwm->duty);
247 else
248 regmap_write(tcbpwmc->regmap,
249 ATMEL_TC_REG(tcbpwmc->channel, RB),
250 tcbpwm->duty);
251
252 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
253 tcbpwm->period);
254
255 /* Use software trigger to apply the new setting */
256 regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CCR),
257 ATMEL_TC_SWTRG | ATMEL_TC_CLKEN);
258 tcbpwmc->bkup.enabled = 1;
259 spin_unlock(&tcbpwmc->lock);
260 return 0;
261}
262
263static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
264 int duty_ns, int period_ns)
265{
266 struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
267 struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
268 struct atmel_tcb_pwm_device *atcbpwm = NULL;
269 int i = 0;
270 int slowclk = 0;
271 unsigned period;
272 unsigned duty;
273 unsigned rate = clk_get_rate(tcbpwmc->clk);
274 unsigned long long min;
275 unsigned long long max;
276
277 /*
278 * Find best clk divisor:
279 * the smallest divisor which can fulfill the period_ns requirements.
280 * If there is a gclk, the first divisor is actually the gclk selector
281 */
282 if (tcbpwmc->gclk)
283 i = 1;
284 for (; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) {
285 if (atmel_tcb_divisors[i] == 0) {
286 slowclk = i;
287 continue;
288 }
289 min = div_u64((u64)NSEC_PER_SEC * atmel_tcb_divisors[i], rate);
290 max = min << tcbpwmc->width;
291 if (max >= period_ns)
292 break;
293 }
294
295 /*
296 * If none of the divisor are small enough to represent period_ns
297 * take slow clock (32KHz).
298 */
299 if (i == ARRAY_SIZE(atmel_tcb_divisors)) {
300 i = slowclk;
301 rate = clk_get_rate(tcbpwmc->slow_clk);
302 min = div_u64(NSEC_PER_SEC, rate);
303 max = min << tcbpwmc->width;
304
305 /* If period is too big return ERANGE error */
306 if (max < period_ns)
307 return -ERANGE;
308 }
309
310 duty = div_u64(duty_ns, min);
311 period = div_u64(period_ns, min);
312
313 if (pwm->hwpwm == 0)
314 atcbpwm = &tcbpwmc->pwms[1];
315 else
316 atcbpwm = &tcbpwmc->pwms[0];
317
318 /*
319 * PWM devices provided by the TCB driver are grouped by 2.
320 * PWM devices in a given group must be configured with the
321 * same period_ns.
322 *
323 * We're checking the period value of the second PWM device
324 * in this group before applying the new config.
325 */
326 if ((atcbpwm && atcbpwm->duty > 0 &&
327 atcbpwm->duty != atcbpwm->period) &&
328 (atcbpwm->div != i || atcbpwm->period != period)) {
329 dev_err(pwmchip_parent(chip),
330 "failed to configure period_ns: PWM group already configured with a different value\n");
331 return -EINVAL;
332 }
333
334 tcbpwm->period = period;
335 tcbpwm->div = i;
336 tcbpwm->duty = duty;
337
338 return 0;
339}
340
341static int atmel_tcb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
342 const struct pwm_state *state)
343{
344 int duty_cycle, period;
345 int ret;
346
347 if (!state->enabled) {
348 atmel_tcb_pwm_disable(chip, pwm, state->polarity);
349 return 0;
350 }
351
352 period = state->period < INT_MAX ? state->period : INT_MAX;
353 duty_cycle = state->duty_cycle < INT_MAX ? state->duty_cycle : INT_MAX;
354
355 ret = atmel_tcb_pwm_config(chip, pwm, duty_cycle, period);
356 if (ret)
357 return ret;
358
359 return atmel_tcb_pwm_enable(chip, pwm, state->polarity);
360}
361
362static const struct pwm_ops atmel_tcb_pwm_ops = {
363 .request = atmel_tcb_pwm_request,
364 .free = atmel_tcb_pwm_free,
365 .apply = atmel_tcb_pwm_apply,
366};
367
368static struct atmel_tcb_config tcb_rm9200_config = {
369 .counter_width = 16,
370};
371
372static struct atmel_tcb_config tcb_sam9x5_config = {
373 .counter_width = 32,
374};
375
376static struct atmel_tcb_config tcb_sama5d2_config = {
377 .counter_width = 32,
378 .has_gclk = 1,
379};
380
381static const struct of_device_id atmel_tcb_of_match[] = {
382 { .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
383 { .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
384 { .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },
385 { /* sentinel */ }
386};
387
388static int atmel_tcb_pwm_probe(struct platform_device *pdev)
389{
390 struct pwm_chip *chip;
391 const struct of_device_id *match;
392 struct atmel_tcb_pwm_chip *tcbpwm;
393 const struct atmel_tcb_config *config;
394 struct device_node *np = pdev->dev.of_node;
395 char clk_name[] = "t0_clk";
396 int err;
397 int channel;
398
399 chip = devm_pwmchip_alloc(&pdev->dev, NPWM, sizeof(*tcbpwm));
400 if (IS_ERR(chip))
401 return PTR_ERR(chip);
402 tcbpwm = to_tcb_chip(chip);
403
404 err = of_property_read_u32(np, "reg", &channel);
405 if (err < 0) {
406 dev_err(&pdev->dev,
407 "failed to get Timer Counter Block channel from device tree (error: %d)\n",
408 err);
409 return err;
410 }
411
412 tcbpwm->regmap = syscon_node_to_regmap(np->parent);
413 if (IS_ERR(tcbpwm->regmap))
414 return PTR_ERR(tcbpwm->regmap);
415
416 tcbpwm->slow_clk = of_clk_get_by_name(np->parent, "slow_clk");
417 if (IS_ERR(tcbpwm->slow_clk))
418 return PTR_ERR(tcbpwm->slow_clk);
419
420 clk_name[1] += channel;
421 tcbpwm->clk = of_clk_get_by_name(np->parent, clk_name);
422 if (IS_ERR(tcbpwm->clk))
423 tcbpwm->clk = of_clk_get_by_name(np->parent, "t0_clk");
424 if (IS_ERR(tcbpwm->clk)) {
425 err = PTR_ERR(tcbpwm->clk);
426 goto err_slow_clk;
427 }
428
429 match = of_match_node(atmel_tcb_of_match, np->parent);
430 config = match->data;
431
432 if (config->has_gclk) {
433 tcbpwm->gclk = of_clk_get_by_name(np->parent, "gclk");
434 if (IS_ERR(tcbpwm->gclk)) {
435 err = PTR_ERR(tcbpwm->gclk);
436 goto err_clk;
437 }
438 }
439
440 chip->ops = &atmel_tcb_pwm_ops;
441 tcbpwm->channel = channel;
442 tcbpwm->width = config->counter_width;
443
444 err = clk_prepare_enable(tcbpwm->slow_clk);
445 if (err)
446 goto err_gclk;
447
448 spin_lock_init(&tcbpwm->lock);
449
450 err = pwmchip_add(chip);
451 if (err < 0)
452 goto err_disable_clk;
453
454 platform_set_drvdata(pdev, chip);
455
456 return 0;
457
458err_disable_clk:
459 clk_disable_unprepare(tcbpwm->slow_clk);
460
461err_gclk:
462 clk_put(tcbpwm->gclk);
463
464err_clk:
465 clk_put(tcbpwm->clk);
466
467err_slow_clk:
468 clk_put(tcbpwm->slow_clk);
469
470 return err;
471}
472
473static void atmel_tcb_pwm_remove(struct platform_device *pdev)
474{
475 struct pwm_chip *chip = platform_get_drvdata(pdev);
476 struct atmel_tcb_pwm_chip *tcbpwm = to_tcb_chip(chip);
477
478 pwmchip_remove(chip);
479
480 clk_disable_unprepare(tcbpwm->slow_clk);
481 clk_put(tcbpwm->gclk);
482 clk_put(tcbpwm->clk);
483 clk_put(tcbpwm->slow_clk);
484}
485
486static const struct of_device_id atmel_tcb_pwm_dt_ids[] = {
487 { .compatible = "atmel,tcb-pwm", },
488 { /* sentinel */ }
489};
490MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
491
492static int atmel_tcb_pwm_suspend(struct device *dev)
493{
494 struct pwm_chip *chip = dev_get_drvdata(dev);
495 struct atmel_tcb_pwm_chip *tcbpwm = to_tcb_chip(chip);
496 struct atmel_tcb_channel *chan = &tcbpwm->bkup;
497 unsigned int channel = tcbpwm->channel;
498
499 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), &chan->cmr);
500 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), &chan->ra);
501 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), &chan->rb);
502 regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), &chan->rc);
503
504 return 0;
505}
506
507static int atmel_tcb_pwm_resume(struct device *dev)
508{
509 struct pwm_chip *chip = dev_get_drvdata(dev);
510 struct atmel_tcb_pwm_chip *tcbpwm = to_tcb_chip(chip);
511 struct atmel_tcb_channel *chan = &tcbpwm->bkup;
512 unsigned int channel = tcbpwm->channel;
513
514 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), chan->cmr);
515 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), chan->ra);
516 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), chan->rb);
517 regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), chan->rc);
518
519 if (chan->enabled)
520 regmap_write(tcbpwm->regmap,
521 ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
522 ATMEL_TC_REG(channel, CCR));
523
524 return 0;
525}
526
527static DEFINE_SIMPLE_DEV_PM_OPS(atmel_tcb_pwm_pm_ops, atmel_tcb_pwm_suspend,
528 atmel_tcb_pwm_resume);
529
530static struct platform_driver atmel_tcb_pwm_driver = {
531 .driver = {
532 .name = "atmel-tcb-pwm",
533 .of_match_table = atmel_tcb_pwm_dt_ids,
534 .pm = pm_ptr(&atmel_tcb_pwm_pm_ops),
535 },
536 .probe = atmel_tcb_pwm_probe,
537 .remove_new = atmel_tcb_pwm_remove,
538};
539module_platform_driver(atmel_tcb_pwm_driver);
540
541MODULE_AUTHOR("Boris BREZILLON <b.brezillon@overkiz.com>");
542MODULE_DESCRIPTION("Atmel Timer Counter Pulse Width Modulation Driver");
543MODULE_LICENSE("GPL v2");