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Philip, Avinash19891b22012-07-25 16:58:19 +05301/*
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>
Philip, Avinash53ad9e82012-11-27 14:18:13 +053028#include <linux/of_device.h>
29
30#include "pwm-tipwmss.h"
Philip, Avinash19891b22012-07-25 16:58:19 +053031
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
Philip, Avinashdaa56292012-09-06 10:40:03 +053087#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
Philip, Avinash19891b22012-07-25 16:58:19 +053096#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
Philip Avinash0e2feb12013-01-17 14:50:02 +0530115struct 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
Philip, Avinash19891b22012-07-25 16:58:19 +0530126struct ehrpwm_pwm_chip {
127 struct pwm_chip chip;
128 unsigned int clk_rate;
129 void __iomem *mmio_base;
Philip, Avinash01b2d452012-09-06 10:44:25 +0530130 unsigned long period_cycles[NUM_PWM_CHANNEL];
Philip, Avinashdaa56292012-09-06 10:40:03 +0530131 enum pwm_polarity polarity[NUM_PWM_CHANNEL];
Philip, Avinashd91861d2012-11-27 14:18:12 +0530132 struct clk *tbclk;
Philip Avinash0e2feb12013-01-17 14:50:02 +0530133 struct ehrpwm_context ctx;
Philip, Avinash19891b22012-07-25 16:58:19 +0530134};
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
Jingoo Hanac872bc2013-08-02 15:22:03 +0900141static u16 ehrpwm_read(void __iomem *base, int offset)
Philip Avinash0e2feb12013-01-17 14:50:02 +0530142{
143 return readw(base + offset);
144}
145
Jingoo Hanac872bc2013-08-02 15:22:03 +0900146static void ehrpwm_write(void __iomem *base, int offset, unsigned int val)
Philip, Avinash19891b22012-07-25 16:58:19 +0530147{
148 writew(val & 0xFFFF, base + offset);
149}
150
Jingoo Hanac872bc2013-08-02 15:22:03 +0900151static void ehrpwm_modify(void __iomem *base, int offset,
Philip, Avinash19891b22012-07-25 16:58:19 +0530152 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
Philip, Avinashdaa56292012-09-06 10:40:03 +0530199static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
Philip, Avinash19891b22012-07-25 16:58:19 +0530200{
Philip, Avinashdaa56292012-09-06 10:40:03 +0530201 int aqctl_reg;
Philip, Avinash19891b22012-07-25 16:58:19 +0530202 unsigned short aqctl_val, aqctl_mask;
203
204 /*
Philip, Avinashdaa56292012-09-06 10:40:03 +0530205 * 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
Philip, Avinash19891b22012-07-25 16:58:19 +0530209 */
210 if (chan == 1) {
211 aqctl_reg = AQCTLB;
Philip, Avinash19891b22012-07-25 16:58:19 +0530212 aqctl_mask = AQCTL_CBU_MASK;
Philip, Avinashdaa56292012-09-06 10:40:03 +0530213
214 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
215 aqctl_val = AQCTL_CHANB_POLINVERSED;
216 else
217 aqctl_val = AQCTL_CHANB_POLNORMAL;
Philip, Avinash19891b22012-07-25 16:58:19 +0530218 } else {
Philip, Avinash19891b22012-07-25 16:58:19 +0530219 aqctl_reg = AQCTLA;
Philip, Avinash19891b22012-07-25 16:58:19 +0530220 aqctl_mask = AQCTL_CAU_MASK;
Philip, Avinashdaa56292012-09-06 10:40:03 +0530221
222 if (pc->polarity[chan] == PWM_POLARITY_INVERSED)
223 aqctl_val = AQCTL_CHANA_POLINVERSED;
224 else
225 aqctl_val = AQCTL_CHANA_POLNORMAL;
Philip, Avinash19891b22012-07-25 16:58:19 +0530226 }
227
Philip, Avinash19891b22012-07-25 16:58:19 +0530228 aqctl_mask |= AQCTL_PRD_MASK | AQCTL_ZRO_MASK;
Philip, Avinashdaa56292012-09-06 10:40:03 +0530229 ehrpwm_modify(pc->mmio_base, aqctl_reg, aqctl_mask, aqctl_val);
Philip, Avinash19891b22012-07-25 16:58:19 +0530230}
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;
Philip, Avinashdaa56292012-09-06 10:40:03 +0530243 int i, cmp_reg;
Philip, Avinash19891b22012-07-25 16:58:19 +0530244
Thierry Redingc2d476a2012-09-02 22:13:40 +0200245 if (period_ns > NSEC_PER_SEC)
Philip, Avinash19891b22012-07-25 16:58:19 +0530246 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
Philip, Avinash01b2d452012-09-06 10:44:25 +0530263 /*
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
Philip, Avinash19891b22012-07-25 16:58:19 +0530285 /* 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
Philip, Avinashdaa56292012-09-06 10:40:03 +0530310 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
Philip, Avinash19891b22012-07-25 16:58:19 +0530319 pm_runtime_put_sync(chip->dev);
320 return 0;
321}
322
Philip, Avinashdaa56292012-09-06 10:40:03 +0530323static 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
Philip, Avinash19891b22012-07-25 16:58:19 +0530333static 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;
Philip, Avinash0074b492013-01-10 18:35:26 +0530337 int ret;
Philip, Avinash19891b22012-07-25 16:58:19 +0530338
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
Philip, Avinashdaa56292012-09-06 10:40:03 +0530357 /* Channels polarity can be configured from action qualifier module */
358 configure_polarity(pc, pwm->hwpwm);
359
Philip, Avinashd91861d2012-11-27 14:18:12 +0530360 /* Enable TBCLK before enabling PWM device */
Marek Beliskob388f152013-06-26 14:38:04 +0200361 ret = clk_enable(pc->tbclk);
Philip, Avinash0074b492013-01-10 18:35:26 +0530362 if (ret) {
Jingoo Han82569e52013-12-19 14:12:05 +0900363 dev_err(chip->dev, "Failed to enable TBCLK for %s\n",
364 dev_name(pc->chip.dev));
Philip, Avinash0074b492013-01-10 18:35:26 +0530365 return ret;
366 }
Philip, Avinashd91861d2012-11-27 14:18:12 +0530367
Philip, Avinash19891b22012-07-25 16:58:19 +0530368 /* 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
Philip, Avinashd91861d2012-11-27 14:18:12 +0530396 /* Disabling TBCLK on PWM disable */
Marek Beliskob388f152013-06-26 14:38:04 +0200397 clk_disable(pc->tbclk);
Philip, Avinashd91861d2012-11-27 14:18:12 +0530398
Philip, Avinash19891b22012-07-25 16:58:19 +0530399 /* 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{
Philip, Avinash01b2d452012-09-06 10:44:25 +0530408 struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
409
Philip, Avinash19891b22012-07-25 16:58:19 +0530410 if (test_bit(PWMF_ENABLED, &pwm->flags)) {
411 dev_warn(chip->dev, "Removing PWM device without disabling\n");
412 pm_runtime_put_sync(chip->dev);
413 }
Philip, Avinash01b2d452012-09-06 10:44:25 +0530414
415 /* set period value to zero on free */
416 pc->period_cycles[pwm->hwpwm] = 0;
Philip, Avinash19891b22012-07-25 16:58:19 +0530417}
418
419static const struct pwm_ops ehrpwm_pwm_ops = {
420 .free = ehrpwm_pwm_free,
421 .config = ehrpwm_pwm_config,
Philip, Avinashdaa56292012-09-06 10:40:03 +0530422 .set_polarity = ehrpwm_pwm_set_polarity,
Philip, Avinash19891b22012-07-25 16:58:19 +0530423 .enable = ehrpwm_pwm_enable,
424 .disable = ehrpwm_pwm_disable,
425 .owner = THIS_MODULE,
426};
427
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530428static const struct of_device_id ehrpwm_of_match[] = {
429 { .compatible = "ti,am33xx-ehrpwm" },
430 {},
431};
432MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
433
Bill Pemberton3e9fe832012-11-19 13:23:14 -0500434static int ehrpwm_pwm_probe(struct platform_device *pdev)
Philip, Avinash19891b22012-07-25 16:58:19 +0530435{
436 int ret;
437 struct resource *r;
438 struct clk *clk;
439 struct ehrpwm_pwm_chip *pc;
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530440 u16 status;
Philip, Avinash19891b22012-07-25 16:58:19 +0530441
442 pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
443 if (!pc) {
444 dev_err(&pdev->dev, "failed to allocate memory\n");
445 return -ENOMEM;
446 }
447
448 clk = devm_clk_get(&pdev->dev, "fck");
449 if (IS_ERR(clk)) {
450 dev_err(&pdev->dev, "failed to get clock\n");
451 return PTR_ERR(clk);
452 }
453
454 pc->clk_rate = clk_get_rate(clk);
455 if (!pc->clk_rate) {
456 dev_err(&pdev->dev, "failed to get clock rate\n");
457 return -EINVAL;
458 }
459
460 pc->chip.dev = &pdev->dev;
461 pc->chip.ops = &ehrpwm_pwm_ops;
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530462 pc->chip.of_xlate = of_pwm_xlate_with_flags;
463 pc->chip.of_pwm_n_cells = 3;
Philip, Avinash19891b22012-07-25 16:58:19 +0530464 pc->chip.base = -1;
465 pc->chip.npwm = NUM_PWM_CHANNEL;
466
467 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Thierry Reding6d4294d2013-01-21 11:09:16 +0100468 pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
469 if (IS_ERR(pc->mmio_base))
470 return PTR_ERR(pc->mmio_base);
Philip, Avinash19891b22012-07-25 16:58:19 +0530471
Philip, Avinashd91861d2012-11-27 14:18:12 +0530472 /* Acquire tbclk for Time Base EHRPWM submodule */
473 pc->tbclk = devm_clk_get(&pdev->dev, "tbclk");
474 if (IS_ERR(pc->tbclk)) {
475 dev_err(&pdev->dev, "Failed to get tbclk\n");
476 return PTR_ERR(pc->tbclk);
477 }
478
Marek Beliskob388f152013-06-26 14:38:04 +0200479 ret = clk_prepare(pc->tbclk);
480 if (ret < 0) {
481 dev_err(&pdev->dev, "clk_prepare() failed: %d\n", ret);
482 return ret;
483 }
484
Philip, Avinash19891b22012-07-25 16:58:19 +0530485 ret = pwmchip_add(&pc->chip);
486 if (ret < 0) {
487 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
488 return ret;
489 }
490
491 pm_runtime_enable(&pdev->dev);
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530492 pm_runtime_get_sync(&pdev->dev);
493
494 status = pwmss_submodule_state_change(pdev->dev.parent,
495 PWMSS_EPWMCLK_EN);
496 if (!(status & PWMSS_EPWMCLK_EN_ACK)) {
497 dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
498 ret = -EINVAL;
499 goto pwmss_clk_failure;
500 }
501
502 pm_runtime_put_sync(&pdev->dev);
503
Philip, Avinash19891b22012-07-25 16:58:19 +0530504 platform_set_drvdata(pdev, pc);
505 return 0;
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530506
507pwmss_clk_failure:
508 pm_runtime_put_sync(&pdev->dev);
509 pm_runtime_disable(&pdev->dev);
510 pwmchip_remove(&pc->chip);
Marek Beliskob388f152013-06-26 14:38:04 +0200511 clk_unprepare(pc->tbclk);
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530512 return ret;
Philip, Avinash19891b22012-07-25 16:58:19 +0530513}
514
Bill Pemberton77f37912012-11-19 13:26:09 -0500515static int ehrpwm_pwm_remove(struct platform_device *pdev)
Philip, Avinash19891b22012-07-25 16:58:19 +0530516{
517 struct ehrpwm_pwm_chip *pc = platform_get_drvdata(pdev);
518
Marek Beliskob388f152013-06-26 14:38:04 +0200519 clk_unprepare(pc->tbclk);
520
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530521 pm_runtime_get_sync(&pdev->dev);
522 /*
523 * Due to hardware misbehaviour, acknowledge of the stop_req
524 * is missing. Hence checking of the status bit skipped.
525 */
526 pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ);
527 pm_runtime_put_sync(&pdev->dev);
528
Philip, Avinash19891b22012-07-25 16:58:19 +0530529 pm_runtime_put_sync(&pdev->dev);
530 pm_runtime_disable(&pdev->dev);
531 return pwmchip_remove(&pc->chip);
532}
533
Axel Linb343a182013-03-26 22:55:57 +0800534static void ehrpwm_pwm_save_context(struct ehrpwm_pwm_chip *pc)
Philip Avinash0e2feb12013-01-17 14:50:02 +0530535{
536 pm_runtime_get_sync(pc->chip.dev);
537 pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
538 pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
539 pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
540 pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
541 pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
542 pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
543 pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
544 pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
545 pm_runtime_put_sync(pc->chip.dev);
546}
547
Axel Linb343a182013-03-26 22:55:57 +0800548static void ehrpwm_pwm_restore_context(struct ehrpwm_pwm_chip *pc)
Philip Avinash0e2feb12013-01-17 14:50:02 +0530549{
550 ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
551 ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
552 ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
553 ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
554 ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
555 ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
556 ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
557 ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
558}
559
Jingoo Han29258b22013-03-11 11:14:41 +0900560#ifdef CONFIG_PM_SLEEP
Philip Avinash0e2feb12013-01-17 14:50:02 +0530561static int ehrpwm_pwm_suspend(struct device *dev)
562{
563 struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
564 int i;
565
566 ehrpwm_pwm_save_context(pc);
567 for (i = 0; i < pc->chip.npwm; i++) {
568 struct pwm_device *pwm = &pc->chip.pwms[i];
569
570 if (!test_bit(PWMF_ENABLED, &pwm->flags))
571 continue;
572
573 /* Disable explicitly if PWM is running */
574 pm_runtime_put_sync(dev);
575 }
576 return 0;
577}
578
579static int ehrpwm_pwm_resume(struct device *dev)
580{
581 struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
582 int i;
583
584 for (i = 0; i < pc->chip.npwm; i++) {
585 struct pwm_device *pwm = &pc->chip.pwms[i];
586
587 if (!test_bit(PWMF_ENABLED, &pwm->flags))
588 continue;
589
590 /* Enable explicitly if PWM was running */
591 pm_runtime_get_sync(dev);
592 }
593 ehrpwm_pwm_restore_context(pc);
594 return 0;
595}
Jingoo Han29258b22013-03-11 11:14:41 +0900596#endif
Philip Avinash0e2feb12013-01-17 14:50:02 +0530597
598static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
599 ehrpwm_pwm_resume);
600
Philip, Avinash19891b22012-07-25 16:58:19 +0530601static struct platform_driver ehrpwm_pwm_driver = {
602 .driver = {
Philip, Avinash53ad9e82012-11-27 14:18:13 +0530603 .name = "ehrpwm",
604 .owner = THIS_MODULE,
605 .of_match_table = ehrpwm_of_match,
Philip Avinash0e2feb12013-01-17 14:50:02 +0530606 .pm = &ehrpwm_pwm_pm_ops,
Philip, Avinash19891b22012-07-25 16:58:19 +0530607 },
608 .probe = ehrpwm_pwm_probe,
Bill Pembertonfd109112012-11-19 13:21:28 -0500609 .remove = ehrpwm_pwm_remove,
Philip, Avinash19891b22012-07-25 16:58:19 +0530610};
611
612module_platform_driver(ehrpwm_pwm_driver);
613
614MODULE_DESCRIPTION("EHRPWM PWM driver");
615MODULE_AUTHOR("Texas Instruments");
616MODULE_LICENSE("GPL");