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1/*
2 * EHRPWM PWM driver
3 *
4 * Copyright (C) 2012 Texas Instruments, Inc. - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <linux/pwm.h>
24#include <linux/io.h>
25#include <linux/err.h>
26#include <linux/clk.h>
27#include <linux/pm_runtime.h>
28#include <linux/of_device.h>
29
30#include "pwm-tipwmss.h"
31
32/* EHRPWM registers and bits definitions */
33
34/* Time base module registers */
35#define TBCTL 0x00
36#define TBPRD 0x0A
37
38#define TBCTL_RUN_MASK (BIT(15) | BIT(14))
39#define TBCTL_STOP_NEXT 0
40#define TBCTL_STOP_ON_CYCLE BIT(14)
41#define TBCTL_FREE_RUN (BIT(15) | BIT(14))
42#define TBCTL_PRDLD_MASK BIT(3)
43#define TBCTL_PRDLD_SHDW 0
44#define TBCTL_PRDLD_IMDT BIT(3)
45#define TBCTL_CLKDIV_MASK (BIT(12) | BIT(11) | BIT(10) | BIT(9) | \
46 BIT(8) | BIT(7))
47#define TBCTL_CTRMODE_MASK (BIT(1) | BIT(0))
48#define TBCTL_CTRMODE_UP 0
49#define TBCTL_CTRMODE_DOWN BIT(0)
50#define TBCTL_CTRMODE_UPDOWN BIT(1)
51#define TBCTL_CTRMODE_FREEZE (BIT(1) | BIT(0))
52
53#define TBCTL_HSPCLKDIV_SHIFT 7
54#define TBCTL_CLKDIV_SHIFT 10
55
56#define CLKDIV_MAX 7
57#define HSPCLKDIV_MAX 7
58#define PERIOD_MAX 0xFFFF
59
60/* compare module registers */
61#define CMPA 0x12
62#define CMPB 0x14
63
64/* Action qualifier module registers */
65#define AQCTLA 0x16
66#define AQCTLB 0x18
67#define AQSFRC 0x1A
68#define AQCSFRC 0x1C
69
70#define AQCTL_CBU_MASK (BIT(9) | BIT(8))
71#define AQCTL_CBU_FRCLOW BIT(8)
72#define AQCTL_CBU_FRCHIGH BIT(9)
73#define AQCTL_CBU_FRCTOGGLE (BIT(9) | BIT(8))
74#define AQCTL_CAU_MASK (BIT(5) | BIT(4))
75#define AQCTL_CAU_FRCLOW BIT(4)
76#define AQCTL_CAU_FRCHIGH BIT(5)
77#define AQCTL_CAU_FRCTOGGLE (BIT(5) | BIT(4))
78#define AQCTL_PRD_MASK (BIT(3) | BIT(2))
79#define AQCTL_PRD_FRCLOW BIT(2)
80#define AQCTL_PRD_FRCHIGH BIT(3)
81#define AQCTL_PRD_FRCTOGGLE (BIT(3) | BIT(2))
82#define AQCTL_ZRO_MASK (BIT(1) | BIT(0))
83#define AQCTL_ZRO_FRCLOW BIT(0)
84#define AQCTL_ZRO_FRCHIGH BIT(1)
85#define AQCTL_ZRO_FRCTOGGLE (BIT(1) | BIT(0))
86
87#define AQCTL_CHANA_POLNORMAL (AQCTL_CAU_FRCLOW | AQCTL_PRD_FRCHIGH | \
88 AQCTL_ZRO_FRCHIGH)
89#define AQCTL_CHANA_POLINVERSED (AQCTL_CAU_FRCHIGH | AQCTL_PRD_FRCLOW | \
90 AQCTL_ZRO_FRCLOW)
91#define AQCTL_CHANB_POLNORMAL (AQCTL_CBU_FRCLOW | AQCTL_PRD_FRCHIGH | \
92 AQCTL_ZRO_FRCHIGH)
93#define AQCTL_CHANB_POLINVERSED (AQCTL_CBU_FRCHIGH | AQCTL_PRD_FRCLOW | \
94 AQCTL_ZRO_FRCLOW)
95
96#define AQSFRC_RLDCSF_MASK (BIT(7) | BIT(6))
97#define AQSFRC_RLDCSF_ZRO 0
98#define AQSFRC_RLDCSF_PRD BIT(6)
99#define AQSFRC_RLDCSF_ZROPRD BIT(7)
100#define AQSFRC_RLDCSF_IMDT (BIT(7) | BIT(6))
101
102#define AQCSFRC_CSFB_MASK (BIT(3) | BIT(2))
103#define AQCSFRC_CSFB_FRCDIS 0
104#define AQCSFRC_CSFB_FRCLOW BIT(2)
105#define AQCSFRC_CSFB_FRCHIGH BIT(3)
106#define AQCSFRC_CSFB_DISSWFRC (BIT(3) | BIT(2))
107#define AQCSFRC_CSFA_MASK (BIT(1) | BIT(0))
108#define AQCSFRC_CSFA_FRCDIS 0
109#define AQCSFRC_CSFA_FRCLOW BIT(0)
110#define AQCSFRC_CSFA_FRCHIGH BIT(1)
111#define AQCSFRC_CSFA_DISSWFRC (BIT(1) | BIT(0))
112
113#define NUM_PWM_CHANNEL 2 /* EHRPWM channels */
114
115struct ehrpwm_context {
116 u16 tbctl;
117 u16 tbprd;
118 u16 cmpa;
119 u16 cmpb;
120 u16 aqctla;
121 u16 aqctlb;
122 u16 aqsfrc;
123 u16 aqcsfrc;
124};
125
126struct ehrpwm_pwm_chip {
127 struct pwm_chip chip;
128 unsigned int clk_rate;
129 void __iomem *mmio_base;
130 unsigned long period_cycles[NUM_PWM_CHANNEL];
131 enum pwm_polarity polarity[NUM_PWM_CHANNEL];
132 struct clk *tbclk;
133 struct ehrpwm_context ctx;
134};
135
136static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
137{
138 return container_of(chip, struct ehrpwm_pwm_chip, chip);
139}
140
141static inline u16 ehrpwm_read(void __iomem *base, int offset)
142{
143 return readw(base + offset);
144}
145
146static inline void ehrpwm_write(void __iomem *base, int offset, unsigned int val)
147{
148 writew(val & 0xFFFF, base + offset);
149}
150
151static void ehrpwm_modify(void __iomem *base, int offset,
152 unsigned short mask, unsigned short val)
153{
154 unsigned short regval;
155
156 regval = readw(base + offset);
157 regval &= ~mask;
158 regval |= val & mask;
159 writew(regval, base + offset);
160}
161
162/**
163 * set_prescale_div - Set up the prescaler divider function
164 * @rqst_prescaler: prescaler value min
165 * @prescale_div: prescaler value set
166 * @tb_clk_div: Time Base Control prescaler bits
167 */
168static int set_prescale_div(unsigned long rqst_prescaler,
169 unsigned short *prescale_div, unsigned short *tb_clk_div)
170{
171 unsigned int clkdiv, hspclkdiv;
172
173 for (clkdiv = 0; clkdiv <= CLKDIV_MAX; clkdiv++) {
174 for (hspclkdiv = 0; hspclkdiv <= HSPCLKDIV_MAX; hspclkdiv++) {
175
176 /*
177 * calculations for prescaler value :
178 * prescale_div = HSPCLKDIVIDER * CLKDIVIDER.
179 * HSPCLKDIVIDER = 2 ** hspclkdiv
180 * CLKDIVIDER = (1), if clkdiv == 0 *OR*
181 * (2 * clkdiv), if clkdiv != 0
182 *
183 * Configure prescale_div value such that period
184 * register value is less than 65535.
185 */
186
187 *prescale_div = (1 << clkdiv) *
188 (hspclkdiv ? (hspclkdiv * 2) : 1);
189 if (*prescale_div > rqst_prescaler) {
190 *tb_clk_div = (clkdiv << TBCTL_CLKDIV_SHIFT) |
191 (hspclkdiv << TBCTL_HSPCLKDIV_SHIFT);
192 return 0;
193 }
194 }
195 }
196 return 1;
197}
198
199static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
200{
201 int aqctl_reg;
202 unsigned short aqctl_val, aqctl_mask;
203
204 /*
205 * Configure PWM output to HIGH/LOW level on counter
206 * reaches compare register value and LOW/HIGH level
207 * on counter value reaches period register value and
208 * zero value on counter
209 */
210 if (chan == 1) {
211 aqctl_reg = AQCTLB;
212 aqctl_mask = AQCTL_CBU_MASK;
213
214 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
215 aqctl_val = AQCTL_CHANB_POLINVERSED;
216 else
217 aqctl_val = AQCTL_CHANB_POLNORMAL;
218 } else {
219 aqctl_reg = AQCTLA;
220 aqctl_mask = AQCTL_CAU_MASK;
221
222 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
223 aqctl_val = AQCTL_CHANA_POLINVERSED;
224 else
225 aqctl_val = AQCTL_CHANA_POLNORMAL;
226 }
227
228 aqctl_mask |= AQCTL_PRD_MASK | AQCTL_ZRO_MASK;
229 ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
230}
231
232/*
233 * period_ns = 10^9 * (ps_divval * period_cycles) / PWM_CLK_RATE
234 * duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
235 */
236static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
237 int duty_ns, int period_ns)
238{
239 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
240 unsigned long long c;
241 unsigned long period_cycles, duty_cycles;
242 unsigned short ps_divval, tb_divval;
243 int i, cmp_reg;
244
245 if (period_ns > NSEC_PER_SEC)
246 return -ERANGE;
247
248 c = pc->clk_rate;
249 c = c * period_ns;
250 do_div(c, NSEC_PER_SEC);
251 period_cycles = (unsigned long)c;
252
253 if (period_cycles < 1) {
254 period_cycles = 1;
255 duty_cycles = 1;
256 } else {
257 c = pc->clk_rate;
258 c = c * duty_ns;
259 do_div(c, NSEC_PER_SEC);
260 duty_cycles = (unsigned long)c;
261 }
262
263 /*
264 * Period values should be same for multiple PWM channels as IP uses
265 * same period register for multiple channels.
266 */
267 for (i = 0; i < NUM_PWM_CHANNEL; i++) {
268 if (pc->period_cycles[i] &&
269 (pc->period_cycles[i] != period_cycles)) {
270 /*
271 * Allow channel to reconfigure period if no other
272 * channels being configured.
273 */
274 if (i == pwm->hwpwm)
275 continue;
276
277 dev_err(chip->dev, "Period value conflicts with channel %d\n",
278 i);
279 return -EINVAL;
280 }
281 }
282
283 pc->period_cycles[pwm->hwpwm] = period_cycles;
284
285 /* Configure clock prescaler to support Low frequency PWM wave */
286 if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
287 &tb_divval)) {
288 dev_err(chip->dev, "Unsupported values\n");
289 return -EINVAL;
290 }
291
292 pm_runtime_get_sync(chip->dev);
293
294 /* Update clock prescaler values */
295 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CLKDIV_MASK, tb_divval);
296
297 /* Update period & duty cycle with presacler division */
298 period_cycles = period_cycles / ps_divval;
299 duty_cycles = duty_cycles / ps_divval;
300
301 /* Configure shadow loading on Period register */
302 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_PRDLD_MASK, TBCTL_PRDLD_SHDW);
303
304 ehrpwm_write(pc->mmio_base, TBPRD, period_cycles);
305
306 /* Configure ehrpwm counter for up-count mode */
307 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
308 TBCTL_CTRMODE_UP);
309
310 if (pwm->hwpwm == 1)
311 /* Channel 1 configured with compare B register */
312 cmp_reg = CMPB;
313 else
314 /* Channel 0 configured with compare A register */
315 cmp_reg = CMPA;
316
317 ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
318
319 pm_runtime_put_sync(chip->dev);
320 return 0;
321}
322
323static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
324 struct pwm_device *pwm, enum pwm_polarity polarity)
325{
326 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
327
328 /* Configuration of polarity in hardware delayed, do at enable */
329 pc->polarity[pwm->hwpwm] = polarity;
330 return 0;
331}
332
333static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
334{
335 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
336 unsigned short aqcsfrc_val, aqcsfrc_mask;
337 int ret;
338
339 /* Leave clock enabled on enabling PWM */
340 pm_runtime_get_sync(chip->dev);
341
342 /* Disabling Action Qualifier on PWM output */
343 if (pwm->hwpwm) {
344 aqcsfrc_val = AQCSFRC_CSFB_FRCDIS;
345 aqcsfrc_mask = AQCSFRC_CSFB_MASK;
346 } else {
347 aqcsfrc_val = AQCSFRC_CSFA_FRCDIS;
348 aqcsfrc_mask = AQCSFRC_CSFA_MASK;
349 }
350
351 /* Changes to shadow mode */
352 ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
353 AQSFRC_RLDCSF_ZRO);
354
355 ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
356
357 /* Channels polarity can be configured from action qualifier module */
358 configure_polarity(pc, pwm->hwpwm);
359
360 /* Enable TBCLK before enabling PWM device */
361 ret = clk_enable(pc->tbclk);
362 if (ret) {
363 dev_err(chip->dev, "Failed to enable TBCLK for %s\n",
364 dev_name(pc->chip.dev));
365 return ret;
366 }
367
368 /* Enable time counter for free_run */
369 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
370 return 0;
371}
372
373static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
374{
375 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
376 unsigned short aqcsfrc_val, aqcsfrc_mask;
377
378 /* Action Qualifier puts PWM output low forcefully */
379 if (pwm->hwpwm) {
380 aqcsfrc_val = AQCSFRC_CSFB_FRCLOW;
381 aqcsfrc_mask = AQCSFRC_CSFB_MASK;
382 } else {
383 aqcsfrc_val = AQCSFRC_CSFA_FRCLOW;
384 aqcsfrc_mask = AQCSFRC_CSFA_MASK;
385 }
386
387 /*
388 * Changes to immediate action on Action Qualifier. This puts
389 * Action Qualifier control on PWM output from next TBCLK
390 */
391 ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
392 AQSFRC_RLDCSF_IMDT);
393
394 ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
395
396 /* Disabling TBCLK on PWM disable */
397 clk_disable(pc->tbclk);
398
399 /* Stop Time base counter */
400 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_STOP_NEXT);
401
402 /* Disable clock on PWM disable */
403 pm_runtime_put_sync(chip->dev);
404}
405
406static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
407{
408 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
409
410 if (pwm_is_enabled(pwm)) {
411 dev_warn(chip->dev, "Removing PWM device without disabling\n");
412 pm_runtime_put_sync(chip->dev);
413 }
414
415 /* set period value to zero on free */
416 pc->period_cycles[pwm->hwpwm] = 0;
417}
418
419static const struct pwm_ops ehrpwm_pwm_ops = {
420 .free = ehrpwm_pwm_free,
421 .config = ehrpwm_pwm_config,
422 .set_polarity = ehrpwm_pwm_set_polarity,
423 .enable = ehrpwm_pwm_enable,
424 .disable = ehrpwm_pwm_disable,
425 .owner = THIS_MODULE,
426};
427
428static const struct of_device_id ehrpwm_of_match[] = {
429 { .compatible = "ti,am33xx-ehrpwm" },
430 {},
431};
432MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
433
434static int ehrpwm_pwm_probe(struct platform_device *pdev)
435{
436 int ret;
437 struct resource *r;
438 struct clk *clk;
439 struct ehrpwm_pwm_chip *pc;
440 u16 status;
441
442 pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
443 if (!pc)
444 return -ENOMEM;
445
446 clk = devm_clk_get(&pdev->dev, "fck");
447 if (IS_ERR(clk)) {
448 dev_err(&pdev->dev, "failed to get clock\n");
449 return PTR_ERR(clk);
450 }
451
452 pc->clk_rate = clk_get_rate(clk);
453 if (!pc->clk_rate) {
454 dev_err(&pdev->dev, "failed to get clock rate\n");
455 return -EINVAL;
456 }
457
458 pc->chip.dev = &pdev->dev;
459 pc->chip.ops = &ehrpwm_pwm_ops;
460 pc->chip.of_xlate = of_pwm_xlate_with_flags;
461 pc->chip.of_pwm_n_cells = 3;
462 pc->chip.base = -1;
463 pc->chip.npwm = NUM_PWM_CHANNEL;
464
465 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
466 pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
467 if (IS_ERR(pc->mmio_base))
468 return PTR_ERR(pc->mmio_base);
469
470 /* Acquire tbclk for Time Base EHRPWM submodule */
471 pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
472 if (IS_ERR(pc->tbclk)) {
473 dev_err(&pdev->dev, "Failed to get tbclk\n");
474 return PTR_ERR(pc->tbclk);
475 }
476
477 ret = clk_prepare(pc->tbclk);
478 if (ret < 0) {
479 dev_err(&pdev->dev, "clk_prepare() failed: %d\n", ret);
480 return ret;
481 }
482
483 ret = pwmchip_add(&pc->chip);
484 if (ret < 0) {
485 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
486 return ret;
487 }
488
489 pm_runtime_enable(&pdev->dev);
490 pm_runtime_get_sync(&pdev->dev);
491
492 status = pwmss_submodule_state_change(pdev->dev.parent,
493 PWMSS_EPWMCLK_EN);
494 if (!(status & PWMSS_EPWMCLK_EN_ACK)) {
495 dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
496 ret = -EINVAL;
497 goto pwmss_clk_failure;
498 }
499
500 pm_runtime_put_sync(&pdev->dev);
501
502 platform_set_drvdata(pdev, pc);
503 return 0;
504
505pwmss_clk_failure:
506 pm_runtime_put_sync(&pdev->dev);
507 pm_runtime_disable(&pdev->dev);
508 pwmchip_remove(&pc->chip);
509 clk_unprepare(pc->tbclk);
510 return ret;
511}
512
513static int ehrpwm_pwm_remove(struct platform_device *pdev)
514{
515 struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
516
517 clk_unprepare(pc->tbclk);
518
519 pm_runtime_get_sync(&pdev->dev);
520 /*
521 * Due to hardware misbehaviour, acknowledge of the stop_req
522 * is missing. Hence checking of the status bit skipped.
523 */
524 pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ);
525 pm_runtime_put_sync(&pdev->dev);
526
527 pm_runtime_put_sync(&pdev->dev);
528 pm_runtime_disable(&pdev->dev);
529 return pwmchip_remove(&pc->chip);
530}
531
532#ifdef CONFIG_PM_SLEEP
533static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
534{
535 pm_runtime_get_sync(pc->chip.dev);
536 pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
537 pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
538 pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
539 pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
540 pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
541 pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
542 pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
543 pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
544 pm_runtime_put_sync(pc->chip.dev);
545}
546
547static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
548{
549 ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
550 ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
551 ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
552 ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
553 ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
554 ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
555 ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
556 ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
557}
558
559static int ehrpwm_pwm_suspend(struct device *dev)
560{
561 struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
562 int i;
563
564 ehrpwm_pwm_save_context(pc);
565 for (i = 0; i < pc->chip.npwm; i++) {
566 struct pwm_device *pwm = &pc->chip.pwms[i];
567
568 if (!pwm_is_enabled(pwm))
569 continue;
570
571 /* Disable explicitly if PWM is running */
572 pm_runtime_put_sync(dev);
573 }
574 return 0;
575}
576
577static int ehrpwm_pwm_resume(struct device *dev)
578{
579 struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
580 int i;
581
582 for (i = 0; i < pc->chip.npwm; i++) {
583 struct pwm_device *pwm = &pc->chip.pwms[i];
584
585 if (!pwm_is_enabled(pwm))
586 continue;
587
588 /* Enable explicitly if PWM was running */
589 pm_runtime_get_sync(dev);
590 }
591 ehrpwm_pwm_restore_context(pc);
592 return 0;
593}
594#endif
595
596static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
597 ehrpwm_pwm_resume);
598
599static struct platform_driver ehrpwm_pwm_driver = {
600 .driver = {
601 .name = "ehrpwm",
602 .of_match_table = ehrpwm_of_match,
603 .pm = &ehrpwm_pwm_pm_ops,
604 },
605 .probe = ehrpwm_pwm_probe,
606 .remove = ehrpwm_pwm_remove,
607};
608
609module_platform_driver(ehrpwm_pwm_driver);
610
611MODULE_DESCRIPTION("EHRPWM PWM driver");
612MODULE_AUTHOR("Texas Instruments");
613MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * EHRPWM PWM driver
4 *
5 * Copyright (C) 2012 Texas Instruments, Inc. - https://www.ti.com/
6 */
7
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/pwm.h>
11#include <linux/io.h>
12#include <linux/err.h>
13#include <linux/clk.h>
14#include <linux/pm_runtime.h>
15#include <linux/of.h>
16
17/* EHRPWM registers and bits definitions */
18
19/* Time base module registers */
20#define TBCTL 0x00
21#define TBPRD 0x0A
22
23#define TBCTL_PRDLD_MASK BIT(3)
24#define TBCTL_PRDLD_SHDW 0
25#define TBCTL_PRDLD_IMDT BIT(3)
26#define TBCTL_CLKDIV_MASK (BIT(12) | BIT(11) | BIT(10) | BIT(9) | \
27 BIT(8) | BIT(7))
28#define TBCTL_CTRMODE_MASK (BIT(1) | BIT(0))
29#define TBCTL_CTRMODE_UP 0
30#define TBCTL_CTRMODE_DOWN BIT(0)
31#define TBCTL_CTRMODE_UPDOWN BIT(1)
32#define TBCTL_CTRMODE_FREEZE (BIT(1) | BIT(0))
33
34#define TBCTL_HSPCLKDIV_SHIFT 7
35#define TBCTL_CLKDIV_SHIFT 10
36
37#define CLKDIV_MAX 7
38#define HSPCLKDIV_MAX 7
39#define PERIOD_MAX 0xFFFF
40
41/* compare module registers */
42#define CMPA 0x12
43#define CMPB 0x14
44
45/* Action qualifier module registers */
46#define AQCTLA 0x16
47#define AQCTLB 0x18
48#define AQSFRC 0x1A
49#define AQCSFRC 0x1C
50
51#define AQCTL_CBU_MASK (BIT(9) | BIT(8))
52#define AQCTL_CBU_FRCLOW BIT(8)
53#define AQCTL_CBU_FRCHIGH BIT(9)
54#define AQCTL_CBU_FRCTOGGLE (BIT(9) | BIT(8))
55#define AQCTL_CAU_MASK (BIT(5) | BIT(4))
56#define AQCTL_CAU_FRCLOW BIT(4)
57#define AQCTL_CAU_FRCHIGH BIT(5)
58#define AQCTL_CAU_FRCTOGGLE (BIT(5) | BIT(4))
59#define AQCTL_PRD_MASK (BIT(3) | BIT(2))
60#define AQCTL_PRD_FRCLOW BIT(2)
61#define AQCTL_PRD_FRCHIGH BIT(3)
62#define AQCTL_PRD_FRCTOGGLE (BIT(3) | BIT(2))
63#define AQCTL_ZRO_MASK (BIT(1) | BIT(0))
64#define AQCTL_ZRO_FRCLOW BIT(0)
65#define AQCTL_ZRO_FRCHIGH BIT(1)
66#define AQCTL_ZRO_FRCTOGGLE (BIT(1) | BIT(0))
67
68#define AQCTL_CHANA_POLNORMAL (AQCTL_CAU_FRCLOW | AQCTL_PRD_FRCHIGH | \
69 AQCTL_ZRO_FRCHIGH)
70#define AQCTL_CHANA_POLINVERSED (AQCTL_CAU_FRCHIGH | AQCTL_PRD_FRCLOW | \
71 AQCTL_ZRO_FRCLOW)
72#define AQCTL_CHANB_POLNORMAL (AQCTL_CBU_FRCLOW | AQCTL_PRD_FRCHIGH | \
73 AQCTL_ZRO_FRCHIGH)
74#define AQCTL_CHANB_POLINVERSED (AQCTL_CBU_FRCHIGH | AQCTL_PRD_FRCLOW | \
75 AQCTL_ZRO_FRCLOW)
76
77#define AQSFRC_RLDCSF_MASK (BIT(7) | BIT(6))
78#define AQSFRC_RLDCSF_ZRO 0
79#define AQSFRC_RLDCSF_PRD BIT(6)
80#define AQSFRC_RLDCSF_ZROPRD BIT(7)
81#define AQSFRC_RLDCSF_IMDT (BIT(7) | BIT(6))
82
83#define AQCSFRC_CSFB_MASK (BIT(3) | BIT(2))
84#define AQCSFRC_CSFB_FRCDIS 0
85#define AQCSFRC_CSFB_FRCLOW BIT(2)
86#define AQCSFRC_CSFB_FRCHIGH BIT(3)
87#define AQCSFRC_CSFB_DISSWFRC (BIT(3) | BIT(2))
88#define AQCSFRC_CSFA_MASK (BIT(1) | BIT(0))
89#define AQCSFRC_CSFA_FRCDIS 0
90#define AQCSFRC_CSFA_FRCLOW BIT(0)
91#define AQCSFRC_CSFA_FRCHIGH BIT(1)
92#define AQCSFRC_CSFA_DISSWFRC (BIT(1) | BIT(0))
93
94#define NUM_PWM_CHANNEL 2 /* EHRPWM channels */
95
96struct ehrpwm_context {
97 u16 tbctl;
98 u16 tbprd;
99 u16 cmpa;
100 u16 cmpb;
101 u16 aqctla;
102 u16 aqctlb;
103 u16 aqsfrc;
104 u16 aqcsfrc;
105};
106
107struct ehrpwm_pwm_chip {
108 unsigned long clk_rate;
109 void __iomem *mmio_base;
110 unsigned long period_cycles[NUM_PWM_CHANNEL];
111 enum pwm_polarity polarity[NUM_PWM_CHANNEL];
112 struct clk *tbclk;
113 struct ehrpwm_context ctx;
114};
115
116static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
117{
118 return pwmchip_get_drvdata(chip);
119}
120
121static inline u16 ehrpwm_read(void __iomem *base, unsigned int offset)
122{
123 return readw(base + offset);
124}
125
126static inline void ehrpwm_write(void __iomem *base, unsigned int offset,
127 u16 value)
128{
129 writew(value, base + offset);
130}
131
132static void ehrpwm_modify(void __iomem *base, unsigned int offset, u16 mask,
133 u16 value)
134{
135 unsigned short val;
136
137 val = readw(base + offset);
138 val &= ~mask;
139 val |= value & mask;
140 writew(val, base + offset);
141}
142
143/**
144 * set_prescale_div - Set up the prescaler divider function
145 * @rqst_prescaler: prescaler value min
146 * @prescale_div: prescaler value set
147 * @tb_clk_div: Time Base Control prescaler bits
148 */
149static int set_prescale_div(unsigned long rqst_prescaler, u16 *prescale_div,
150 u16 *tb_clk_div)
151{
152 unsigned int clkdiv, hspclkdiv;
153
154 for (clkdiv = 0; clkdiv <= CLKDIV_MAX; clkdiv++) {
155 for (hspclkdiv = 0; hspclkdiv <= HSPCLKDIV_MAX; hspclkdiv++) {
156 /*
157 * calculations for prescaler value :
158 * prescale_div = HSPCLKDIVIDER * CLKDIVIDER.
159 * HSPCLKDIVIDER = 2 ** hspclkdiv
160 * CLKDIVIDER = (1), if clkdiv == 0 *OR*
161 * (2 * clkdiv), if clkdiv != 0
162 *
163 * Configure prescale_div value such that period
164 * register value is less than 65535.
165 */
166
167 *prescale_div = (1 << clkdiv) *
168 (hspclkdiv ? (hspclkdiv * 2) : 1);
169 if (*prescale_div > rqst_prescaler) {
170 *tb_clk_div = (clkdiv << TBCTL_CLKDIV_SHIFT) |
171 (hspclkdiv << TBCTL_HSPCLKDIV_SHIFT);
172 return 0;
173 }
174 }
175 }
176
177 return 1;
178}
179
180static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
181{
182 u16 aqctl_val, aqctl_mask;
183 unsigned int aqctl_reg;
184
185 /*
186 * Configure PWM output to HIGH/LOW level on counter
187 * reaches compare register value and LOW/HIGH level
188 * on counter value reaches period register value and
189 * zero value on counter
190 */
191 if (chan == 1) {
192 aqctl_reg = AQCTLB;
193 aqctl_mask = AQCTL_CBU_MASK;
194
195 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
196 aqctl_val = AQCTL_CHANB_POLINVERSED;
197 else
198 aqctl_val = AQCTL_CHANB_POLNORMAL;
199 } else {
200 aqctl_reg = AQCTLA;
201 aqctl_mask = AQCTL_CAU_MASK;
202
203 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
204 aqctl_val = AQCTL_CHANA_POLINVERSED;
205 else
206 aqctl_val = AQCTL_CHANA_POLNORMAL;
207 }
208
209 aqctl_mask |= AQCTL_PRD_MASK | AQCTL_ZRO_MASK;
210 ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
211}
212
213/*
214 * period_ns = 10^9 * (ps_divval * period_cycles) / PWM_CLK_RATE
215 * duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
216 */
217static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
218 u64 duty_ns, u64 period_ns)
219{
220 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
221 u32 period_cycles, duty_cycles;
222 u16 ps_divval, tb_divval;
223 unsigned int i, cmp_reg;
224 unsigned long long c;
225
226 if (period_ns > NSEC_PER_SEC)
227 return -ERANGE;
228
229 c = pc->clk_rate;
230 c = c * period_ns;
231 do_div(c, NSEC_PER_SEC);
232 period_cycles = (unsigned long)c;
233
234 if (period_cycles < 1) {
235 period_cycles = 1;
236 duty_cycles = 1;
237 } else {
238 c = pc->clk_rate;
239 c = c * duty_ns;
240 do_div(c, NSEC_PER_SEC);
241 duty_cycles = (unsigned long)c;
242 }
243
244 /*
245 * Period values should be same for multiple PWM channels as IP uses
246 * same period register for multiple channels.
247 */
248 for (i = 0; i < NUM_PWM_CHANNEL; i++) {
249 if (pc->period_cycles[i] &&
250 (pc->period_cycles[i] != period_cycles)) {
251 /*
252 * Allow channel to reconfigure period if no other
253 * channels being configured.
254 */
255 if (i == pwm->hwpwm)
256 continue;
257
258 dev_err(pwmchip_parent(chip),
259 "period value conflicts with channel %u\n",
260 i);
261 return -EINVAL;
262 }
263 }
264
265 pc->period_cycles[pwm->hwpwm] = period_cycles;
266
267 /* Configure clock prescaler to support Low frequency PWM wave */
268 if (set_prescale_div(period_cycles/PERIOD_MAX, &ps_divval,
269 &tb_divval)) {
270 dev_err(pwmchip_parent(chip), "Unsupported values\n");
271 return -EINVAL;
272 }
273
274 pm_runtime_get_sync(pwmchip_parent(chip));
275
276 /* Update clock prescaler values */
277 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CLKDIV_MASK, tb_divval);
278
279 /* Update period & duty cycle with presacler division */
280 period_cycles = period_cycles / ps_divval;
281 duty_cycles = duty_cycles / ps_divval;
282
283 /* Configure shadow loading on Period register */
284 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_PRDLD_MASK, TBCTL_PRDLD_SHDW);
285
286 ehrpwm_write(pc->mmio_base, TBPRD, period_cycles);
287
288 /* Configure ehrpwm counter for up-count mode */
289 ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_CTRMODE_MASK,
290 TBCTL_CTRMODE_UP);
291
292 if (pwm->hwpwm == 1)
293 /* Channel 1 configured with compare B register */
294 cmp_reg = CMPB;
295 else
296 /* Channel 0 configured with compare A register */
297 cmp_reg = CMPA;
298
299 ehrpwm_write(pc->mmio_base, cmp_reg, duty_cycles);
300
301 pm_runtime_put_sync(pwmchip_parent(chip));
302
303 return 0;
304}
305
306static int ehrpwm_pwm_set_polarity(struct pwm_chip *chip,
307 struct pwm_device *pwm,
308 enum pwm_polarity polarity)
309{
310 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
311
312 /* Configuration of polarity in hardware delayed, do at enable */
313 pc->polarity[pwm->hwpwm] = polarity;
314
315 return 0;
316}
317
318static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
319{
320 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
321 u16 aqcsfrc_val, aqcsfrc_mask;
322 int ret;
323
324 /* Leave clock enabled on enabling PWM */
325 pm_runtime_get_sync(pwmchip_parent(chip));
326
327 /* Disabling Action Qualifier on PWM output */
328 if (pwm->hwpwm) {
329 aqcsfrc_val = AQCSFRC_CSFB_FRCDIS;
330 aqcsfrc_mask = AQCSFRC_CSFB_MASK;
331 } else {
332 aqcsfrc_val = AQCSFRC_CSFA_FRCDIS;
333 aqcsfrc_mask = AQCSFRC_CSFA_MASK;
334 }
335
336 /* Changes to shadow mode */
337 ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
338 AQSFRC_RLDCSF_ZRO);
339
340 ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
341
342 /* Channels polarity can be configured from action qualifier module */
343 configure_polarity(pc, pwm->hwpwm);
344
345 /* Enable TBCLK */
346 ret = clk_enable(pc->tbclk);
347 if (ret) {
348 dev_err(pwmchip_parent(chip), "Failed to enable TBCLK for %s: %d\n",
349 dev_name(pwmchip_parent(chip)), ret);
350 return ret;
351 }
352
353 return 0;
354}
355
356static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
357{
358 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
359 u16 aqcsfrc_val, aqcsfrc_mask;
360
361 /* Action Qualifier puts PWM output low forcefully */
362 if (pwm->hwpwm) {
363 aqcsfrc_val = AQCSFRC_CSFB_FRCLOW;
364 aqcsfrc_mask = AQCSFRC_CSFB_MASK;
365 } else {
366 aqcsfrc_val = AQCSFRC_CSFA_FRCLOW;
367 aqcsfrc_mask = AQCSFRC_CSFA_MASK;
368 }
369
370 /* Update shadow register first before modifying active register */
371 ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
372 AQSFRC_RLDCSF_ZRO);
373 ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
374 /*
375 * Changes to immediate action on Action Qualifier. This puts
376 * Action Qualifier control on PWM output from next TBCLK
377 */
378 ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK,
379 AQSFRC_RLDCSF_IMDT);
380
381 ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
382
383 /* Disabling TBCLK on PWM disable */
384 clk_disable(pc->tbclk);
385
386 /* Disable clock on PWM disable */
387 pm_runtime_put_sync(pwmchip_parent(chip));
388}
389
390static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
391{
392 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
393
394 if (pwm_is_enabled(pwm)) {
395 dev_warn(pwmchip_parent(chip), "Removing PWM device without disabling\n");
396 pm_runtime_put_sync(pwmchip_parent(chip));
397 }
398
399 /* set period value to zero on free */
400 pc->period_cycles[pwm->hwpwm] = 0;
401}
402
403static int ehrpwm_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
404 const struct pwm_state *state)
405{
406 int err;
407 bool enabled = pwm->state.enabled;
408
409 if (state->polarity != pwm->state.polarity) {
410 if (enabled) {
411 ehrpwm_pwm_disable(chip, pwm);
412 enabled = false;
413 }
414
415 err = ehrpwm_pwm_set_polarity(chip, pwm, state->polarity);
416 if (err)
417 return err;
418 }
419
420 if (!state->enabled) {
421 if (enabled)
422 ehrpwm_pwm_disable(chip, pwm);
423 return 0;
424 }
425
426 err = ehrpwm_pwm_config(chip, pwm, state->duty_cycle, state->period);
427 if (err)
428 return err;
429
430 if (!enabled)
431 err = ehrpwm_pwm_enable(chip, pwm);
432
433 return err;
434}
435
436static const struct pwm_ops ehrpwm_pwm_ops = {
437 .free = ehrpwm_pwm_free,
438 .apply = ehrpwm_pwm_apply,
439};
440
441static const struct of_device_id ehrpwm_of_match[] = {
442 { .compatible = "ti,am3352-ehrpwm" },
443 { .compatible = "ti,am33xx-ehrpwm" },
444 {},
445};
446MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
447
448static int ehrpwm_pwm_probe(struct platform_device *pdev)
449{
450 struct device_node *np = pdev->dev.of_node;
451 struct ehrpwm_pwm_chip *pc;
452 struct pwm_chip *chip;
453 struct clk *clk;
454 int ret;
455
456 chip = devm_pwmchip_alloc(&pdev->dev, NUM_PWM_CHANNEL, sizeof(*pc));
457 if (IS_ERR(chip))
458 return PTR_ERR(chip);
459 pc = to_ehrpwm_pwm_chip(chip);
460
461 clk = devm_clk_get(&pdev->dev, "fck");
462 if (IS_ERR(clk)) {
463 if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
464 dev_warn(&pdev->dev, "Binding is obsolete.\n");
465 clk = devm_clk_get(pdev->dev.parent, "fck");
466 }
467 }
468
469 if (IS_ERR(clk))
470 return dev_err_probe(&pdev->dev, PTR_ERR(clk), "Failed to get fck\n");
471
472 pc->clk_rate = clk_get_rate(clk);
473 if (!pc->clk_rate) {
474 dev_err(&pdev->dev, "failed to get clock rate\n");
475 return -EINVAL;
476 }
477
478 chip->ops = &ehrpwm_pwm_ops;
479
480 pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
481 if (IS_ERR(pc->mmio_base))
482 return PTR_ERR(pc->mmio_base);
483
484 /* Acquire tbclk for Time Base EHRPWM submodule */
485 pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
486 if (IS_ERR(pc->tbclk))
487 return dev_err_probe(&pdev->dev, PTR_ERR(pc->tbclk), "Failed to get tbclk\n");
488
489 ret = clk_prepare(pc->tbclk);
490 if (ret < 0) {
491 dev_err(&pdev->dev, "clk_prepare() failed: %d\n", ret);
492 return ret;
493 }
494
495 ret = pwmchip_add(chip);
496 if (ret < 0) {
497 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
498 goto err_clk_unprepare;
499 }
500
501 platform_set_drvdata(pdev, chip);
502 pm_runtime_enable(&pdev->dev);
503
504 return 0;
505
506err_clk_unprepare:
507 clk_unprepare(pc->tbclk);
508
509 return ret;
510}
511
512static void ehrpwm_pwm_remove(struct platform_device *pdev)
513{
514 struct pwm_chip *chip = platform_get_drvdata(pdev);
515 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
516
517 pwmchip_remove(chip);
518
519 clk_unprepare(pc->tbclk);
520
521 pm_runtime_disable(&pdev->dev);
522}
523
524static void ehrpwm_pwm_save_context(struct pwm_chip *chip)
525{
526 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
527
528 pm_runtime_get_sync(pwmchip_parent(chip));
529
530 pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
531 pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
532 pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
533 pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
534 pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
535 pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
536 pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
537 pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
538
539 pm_runtime_put_sync(pwmchip_parent(chip));
540}
541
542static void ehrpwm_pwm_restore_context(struct pwm_chip *chip)
543{
544 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
545
546 ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
547 ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
548 ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
549 ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
550 ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
551 ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
552 ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
553 ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
554}
555
556static int ehrpwm_pwm_suspend(struct device *dev)
557{
558 struct pwm_chip *chip = dev_get_drvdata(dev);
559 unsigned int i;
560
561 ehrpwm_pwm_save_context(chip);
562
563 for (i = 0; i < chip->npwm; i++) {
564 struct pwm_device *pwm = &chip->pwms[i];
565
566 if (!pwm_is_enabled(pwm))
567 continue;
568
569 /* Disable explicitly if PWM is running */
570 pm_runtime_put_sync(dev);
571 }
572
573 return 0;
574}
575
576static int ehrpwm_pwm_resume(struct device *dev)
577{
578 struct pwm_chip *chip = dev_get_drvdata(dev);
579 unsigned int i;
580
581 for (i = 0; i < chip->npwm; i++) {
582 struct pwm_device *pwm = &chip->pwms[i];
583
584 if (!pwm_is_enabled(pwm))
585 continue;
586
587 /* Enable explicitly if PWM was running */
588 pm_runtime_get_sync(dev);
589 }
590
591 ehrpwm_pwm_restore_context(chip);
592
593 return 0;
594}
595
596static DEFINE_SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
597 ehrpwm_pwm_resume);
598
599static struct platform_driver ehrpwm_pwm_driver = {
600 .driver = {
601 .name = "ehrpwm",
602 .of_match_table = ehrpwm_of_match,
603 .pm = pm_ptr(&ehrpwm_pwm_pm_ops),
604 },
605 .probe = ehrpwm_pwm_probe,
606 .remove = ehrpwm_pwm_remove,
607};
608module_platform_driver(ehrpwm_pwm_driver);
609
610MODULE_DESCRIPTION("EHRPWM PWM driver");
611MODULE_AUTHOR("Texas Instruments");
612MODULE_LICENSE("GPL");