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Peter Ujfalusi3744c262012-11-27 11:09:57 +01001/*
2 * Driver for TWL4030/6030 Generic Pulse Width Modulator
3 *
4 * Copyright (C) 2012 Texas Instruments
5 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/module.h>
21#include <linux/platform_device.h>
22#include <linux/pwm.h>
23#include <linux/i2c/twl.h>
24#include <linux/slab.h>
25
26/*
27 * This driver handles the PWMs of TWL4030 and TWL6030.
28 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
29 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
30 */
31
32#define TWL_PWM_MAX 0x7f
33
34/* Registers, bits and macro for TWL4030 */
35#define TWL4030_GPBR1_REG 0x0c
36#define TWL4030_PMBR1_REG 0x0d
37
38/* GPBR1 register bits */
39#define TWL4030_PWMXCLK_ENABLE (1 << 0)
40#define TWL4030_PWMX_ENABLE (1 << 2)
41#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
42#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
43
44/* PMBR1 register bits */
45#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
46#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
47#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
48#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
49
50/* Register, bits and macro for TWL6030 */
51#define TWL6030_TOGGLE3_REG 0x92
52
53#define TWL6030_PWMXR (1 << 0)
54#define TWL6030_PWMXS (1 << 1)
55#define TWL6030_PWMXEN (1 << 2)
56#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
57
58struct twl_pwm_chip {
59 struct pwm_chip chip;
60 struct mutex mutex;
61 u8 twl6030_toggle3;
62 u8 twl4030_pwm_mux;
63};
64
65static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
66{
67 return container_of(chip, struct twl_pwm_chip, chip);
68}
69
70static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
71 int duty_ns, int period_ns)
72{
73 int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
74 u8 pwm_config[2] = { 1, 0 };
75 int base, ret;
76
77 /*
78 * To configure the duty period:
79 * On-cycle is set to 1 (the minimum allowed value)
80 * The off time of 0 is not configurable, so the mapping is:
81 * 0 -> off cycle = 2,
82 * 1 -> off cycle = 2,
83 * 2 -> off cycle = 3,
84 * 126 - > off cycle 127,
85 * 127 - > off cycle 1
86 * When on cycle == off cycle the PWM will be always on
87 */
88 if (duty_cycle == 1)
89 duty_cycle = 2;
90 else if (duty_cycle > TWL_PWM_MAX)
91 duty_cycle = 1;
92
93 base = pwm->hwpwm * 3;
94
95 pwm_config[1] = duty_cycle;
96
97 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
98 if (ret < 0)
99 dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
100
101 return ret;
102}
103
104static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
105{
106 struct twl_pwm_chip *twl = to_twl(chip);
107 int ret;
108 u8 val;
109
110 mutex_lock(&twl->mutex);
111 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
112 if (ret < 0) {
113 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
114 goto out;
115 }
116
117 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
118
119 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
120 if (ret < 0)
121 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
122
123 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
124
125 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
126 if (ret < 0)
127 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
128
129out:
130 mutex_unlock(&twl->mutex);
131 return ret;
132}
133
134static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
135{
136 struct twl_pwm_chip *twl = to_twl(chip);
137 int ret;
138 u8 val;
139
140 mutex_lock(&twl->mutex);
141 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
142 if (ret < 0) {
143 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
144 goto out;
145 }
146
147 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
148
149 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
150 if (ret < 0)
151 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
152
153 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
154
155 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
156 if (ret < 0)
157 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
158
159out:
160 mutex_unlock(&twl->mutex);
161}
162
163static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
164{
165 struct twl_pwm_chip *twl = to_twl(chip);
166 int ret;
167 u8 val, mask, bits;
168
169 if (pwm->hwpwm == 1) {
170 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
171 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
172 } else {
173 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
174 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
175 }
176
177 mutex_lock(&twl->mutex);
178 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
179 if (ret < 0) {
180 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
181 goto out;
182 }
183
184 /* Save the current MUX configuration for the PWM */
185 twl->twl4030_pwm_mux &= ~mask;
186 twl->twl4030_pwm_mux |= (val & mask);
187
188 /* Select PWM functionality */
189 val &= ~mask;
190 val |= bits;
191
192 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
193 if (ret < 0)
194 dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
195
196out:
197 mutex_unlock(&twl->mutex);
198 return ret;
199}
200
201static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
202{
Johannes Thumshirn30f78612013-02-16 19:20:51 +0100203 struct twl_pwm_chip *twl = to_twl(chip);
Peter Ujfalusi3744c262012-11-27 11:09:57 +0100204 int ret;
205 u8 val, mask;
206
207 if (pwm->hwpwm == 1)
208 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
209 else
210 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
211
212 mutex_lock(&twl->mutex);
213 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
214 if (ret < 0) {
215 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
216 goto out;
217 }
218
219 /* Restore the MUX configuration for the PWM */
220 val &= ~mask;
221 val |= (twl->twl4030_pwm_mux & mask);
222
223 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
224 if (ret < 0)
225 dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
226
227out:
228 mutex_unlock(&twl->mutex);
229}
230
231static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
232{
Johannes Thumshirn30f78612013-02-16 19:20:51 +0100233 struct twl_pwm_chip *twl = to_twl(chip);
Peter Ujfalusi3744c262012-11-27 11:09:57 +0100234 int ret;
235 u8 val;
236
237 mutex_lock(&twl->mutex);
238 val = twl->twl6030_toggle3;
239 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
240 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
241
242 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
243 if (ret < 0) {
244 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
245 goto out;
246 }
247
248 twl->twl6030_toggle3 = val;
249out:
250 mutex_unlock(&twl->mutex);
251 return 0;
252}
253
254static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
255{
Johannes Thumshirn30f78612013-02-16 19:20:51 +0100256 struct twl_pwm_chip *twl = to_twl(chip);
Peter Ujfalusi3744c262012-11-27 11:09:57 +0100257 int ret;
258 u8 val;
259
260 mutex_lock(&twl->mutex);
261 val = twl->twl6030_toggle3;
262 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
263 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
264
265 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
266 if (ret < 0) {
267 dev_err(chip->dev, "%s: Failed to read TOGGLE3\n", pwm->label);
268 goto out;
269 }
270
271 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
272
273 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
274 if (ret < 0) {
275 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
276 goto out;
277 }
278
279 twl->twl6030_toggle3 = val;
280out:
281 mutex_unlock(&twl->mutex);
282}
283
284static const struct pwm_ops twl4030_pwm_ops = {
285 .config = twl_pwm_config,
286 .enable = twl4030_pwm_enable,
287 .disable = twl4030_pwm_disable,
288 .request = twl4030_pwm_request,
289 .free = twl4030_pwm_free,
290};
291
292static const struct pwm_ops twl6030_pwm_ops = {
293 .config = twl_pwm_config,
294 .enable = twl6030_pwm_enable,
295 .disable = twl6030_pwm_disable,
296};
297
298static int twl_pwm_probe(struct platform_device *pdev)
299{
300 struct twl_pwm_chip *twl;
301 int ret;
302
303 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
304 if (!twl)
305 return -ENOMEM;
306
307 if (twl_class_is_4030())
308 twl->chip.ops = &twl4030_pwm_ops;
309 else
310 twl->chip.ops = &twl6030_pwm_ops;
311
312 twl->chip.dev = &pdev->dev;
313 twl->chip.base = -1;
314 twl->chip.npwm = 2;
Florian Vaussard2e2a0f62013-01-28 15:00:58 +0100315 twl->chip.can_sleep = true;
Peter Ujfalusi3744c262012-11-27 11:09:57 +0100316
317 mutex_init(&twl->mutex);
318
319 ret = pwmchip_add(&twl->chip);
320 if (ret < 0)
321 return ret;
322
323 platform_set_drvdata(pdev, twl);
324
325 return 0;
326}
327
328static int twl_pwm_remove(struct platform_device *pdev)
329{
330 struct twl_pwm_chip *twl = platform_get_drvdata(pdev);
331
332 return pwmchip_remove(&twl->chip);
333}
334
335#ifdef CONFIG_OF
336static struct of_device_id twl_pwm_of_match[] = {
337 { .compatible = "ti,twl4030-pwm" },
338 { .compatible = "ti,twl6030-pwm" },
339 { },
340};
341MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
342#endif
343
344static struct platform_driver twl_pwm_driver = {
345 .driver = {
346 .name = "twl-pwm",
347 .of_match_table = of_match_ptr(twl_pwm_of_match),
348 },
349 .probe = twl_pwm_probe,
350 .remove = twl_pwm_remove,
351};
352module_platform_driver(twl_pwm_driver);
353
354MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
355MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
356MODULE_ALIAS("platform:twl-pwm");
357MODULE_LICENSE("GPL");