Commit | Line | Data |
---|---|---|
3744c263 PU |
1 | /* |
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> | |
ea8eeb15 | 21 | #include <linux/of.h> |
3744c263 PU |
22 | #include <linux/platform_device.h> |
23 | #include <linux/pwm.h> | |
24 | #include <linux/i2c/twl.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | /* | |
28 | * This driver handles the PWMs of TWL4030 and TWL6030. | |
29 | * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1 | |
30 | * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2 | |
31 | */ | |
32 | ||
33 | #define TWL_PWM_MAX 0x7f | |
34 | ||
35 | /* Registers, bits and macro for TWL4030 */ | |
36 | #define TWL4030_GPBR1_REG 0x0c | |
37 | #define TWL4030_PMBR1_REG 0x0d | |
38 | ||
39 | /* GPBR1 register bits */ | |
40 | #define TWL4030_PWMXCLK_ENABLE (1 << 0) | |
41 | #define TWL4030_PWMX_ENABLE (1 << 2) | |
42 | #define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE) | |
43 | #define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm)) | |
44 | ||
45 | /* PMBR1 register bits */ | |
46 | #define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2) | |
47 | #define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2) | |
48 | #define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4) | |
49 | #define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4) | |
50 | ||
51 | /* Register, bits and macro for TWL6030 */ | |
52 | #define TWL6030_TOGGLE3_REG 0x92 | |
53 | ||
54 | #define TWL6030_PWMXR (1 << 0) | |
55 | #define TWL6030_PWMXS (1 << 1) | |
56 | #define TWL6030_PWMXEN (1 << 2) | |
57 | #define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3)) | |
58 | ||
59 | struct twl_pwm_chip { | |
60 | struct pwm_chip chip; | |
61 | struct mutex mutex; | |
62 | u8 twl6030_toggle3; | |
63 | u8 twl4030_pwm_mux; | |
64 | }; | |
65 | ||
66 | static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip) | |
67 | { | |
68 | return container_of(chip, struct twl_pwm_chip, chip); | |
69 | } | |
70 | ||
71 | static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, | |
72 | int duty_ns, int period_ns) | |
73 | { | |
74 | int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1; | |
75 | u8 pwm_config[2] = { 1, 0 }; | |
76 | int base, ret; | |
77 | ||
78 | /* | |
79 | * To configure the duty period: | |
80 | * On-cycle is set to 1 (the minimum allowed value) | |
81 | * The off time of 0 is not configurable, so the mapping is: | |
82 | * 0 -> off cycle = 2, | |
83 | * 1 -> off cycle = 2, | |
84 | * 2 -> off cycle = 3, | |
85 | * 126 - > off cycle 127, | |
86 | * 127 - > off cycle 1 | |
87 | * When on cycle == off cycle the PWM will be always on | |
88 | */ | |
89 | if (duty_cycle == 1) | |
90 | duty_cycle = 2; | |
91 | else if (duty_cycle > TWL_PWM_MAX) | |
92 | duty_cycle = 1; | |
93 | ||
94 | base = pwm->hwpwm * 3; | |
95 | ||
96 | pwm_config[1] = duty_cycle; | |
97 | ||
98 | ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2); | |
99 | if (ret < 0) | |
100 | dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
106 | { | |
107 | struct twl_pwm_chip *twl = to_twl(chip); | |
108 | int ret; | |
109 | u8 val; | |
110 | ||
111 | mutex_lock(&twl->mutex); | |
112 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); | |
113 | if (ret < 0) { | |
114 | dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); | |
115 | goto out; | |
116 | } | |
117 | ||
118 | val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); | |
119 | ||
120 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
121 | if (ret < 0) | |
122 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
123 | ||
124 | val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); | |
125 | ||
126 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
127 | if (ret < 0) | |
128 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
129 | ||
130 | out: | |
131 | mutex_unlock(&twl->mutex); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) | |
136 | { | |
137 | struct twl_pwm_chip *twl = to_twl(chip); | |
138 | int ret; | |
139 | u8 val; | |
140 | ||
141 | mutex_lock(&twl->mutex); | |
142 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); | |
143 | if (ret < 0) { | |
144 | dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); | |
145 | goto out; | |
146 | } | |
147 | ||
148 | val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); | |
149 | ||
150 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
151 | if (ret < 0) | |
152 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
153 | ||
154 | val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); | |
155 | ||
156 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
157 | if (ret < 0) | |
158 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
159 | ||
160 | out: | |
161 | mutex_unlock(&twl->mutex); | |
162 | } | |
163 | ||
164 | static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) | |
165 | { | |
166 | struct twl_pwm_chip *twl = to_twl(chip); | |
167 | int ret; | |
168 | u8 val, mask, bits; | |
169 | ||
170 | if (pwm->hwpwm == 1) { | |
171 | mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; | |
172 | bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1; | |
173 | } else { | |
174 | mask = TWL4030_GPIO6_PWM0_MUTE_MASK; | |
175 | bits = TWL4030_GPIO6_PWM0_MUTE_PWM0; | |
176 | } | |
177 | ||
178 | mutex_lock(&twl->mutex); | |
179 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); | |
180 | if (ret < 0) { | |
181 | dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); | |
182 | goto out; | |
183 | } | |
184 | ||
185 | /* Save the current MUX configuration for the PWM */ | |
186 | twl->twl4030_pwm_mux &= ~mask; | |
187 | twl->twl4030_pwm_mux |= (val & mask); | |
188 | ||
189 | /* Select PWM functionality */ | |
190 | val &= ~mask; | |
191 | val |= bits; | |
192 | ||
193 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); | |
194 | if (ret < 0) | |
195 | dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); | |
196 | ||
197 | out: | |
198 | mutex_unlock(&twl->mutex); | |
199 | return ret; | |
200 | } | |
201 | ||
202 | static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) | |
203 | { | |
30f78617 | 204 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
205 | int ret; |
206 | u8 val, mask; | |
207 | ||
208 | if (pwm->hwpwm == 1) | |
209 | mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; | |
210 | else | |
211 | mask = TWL4030_GPIO6_PWM0_MUTE_MASK; | |
212 | ||
213 | mutex_lock(&twl->mutex); | |
214 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); | |
215 | if (ret < 0) { | |
216 | dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | /* Restore the MUX configuration for the PWM */ | |
221 | val &= ~mask; | |
222 | val |= (twl->twl4030_pwm_mux & mask); | |
223 | ||
224 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); | |
225 | if (ret < 0) | |
226 | dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); | |
227 | ||
228 | out: | |
229 | mutex_unlock(&twl->mutex); | |
230 | } | |
231 | ||
232 | static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
233 | { | |
30f78617 | 234 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
235 | int ret; |
236 | u8 val; | |
237 | ||
238 | mutex_lock(&twl->mutex); | |
239 | val = twl->twl6030_toggle3; | |
240 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
241 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
242 | ||
243 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
244 | if (ret < 0) { | |
245 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
246 | goto out; | |
247 | } | |
248 | ||
249 | twl->twl6030_toggle3 = val; | |
250 | out: | |
251 | mutex_unlock(&twl->mutex); | |
c8e4df31 | 252 | return ret; |
3744c263 PU |
253 | } |
254 | ||
255 | static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) | |
256 | { | |
30f78617 | 257 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
258 | int ret; |
259 | u8 val; | |
260 | ||
261 | mutex_lock(&twl->mutex); | |
262 | val = twl->twl6030_toggle3; | |
263 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
264 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
265 | ||
266 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
267 | if (ret < 0) { | |
268 | dev_err(chip->dev, "%s: Failed to read TOGGLE3\n", pwm->label); | |
269 | goto out; | |
270 | } | |
271 | ||
272 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
273 | ||
274 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
275 | if (ret < 0) { | |
276 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
277 | goto out; | |
278 | } | |
279 | ||
280 | twl->twl6030_toggle3 = val; | |
281 | out: | |
282 | mutex_unlock(&twl->mutex); | |
283 | } | |
284 | ||
285 | static const struct pwm_ops twl4030_pwm_ops = { | |
286 | .config = twl_pwm_config, | |
287 | .enable = twl4030_pwm_enable, | |
288 | .disable = twl4030_pwm_disable, | |
289 | .request = twl4030_pwm_request, | |
290 | .free = twl4030_pwm_free, | |
d5714e8b | 291 | .owner = THIS_MODULE, |
3744c263 PU |
292 | }; |
293 | ||
294 | static const struct pwm_ops twl6030_pwm_ops = { | |
295 | .config = twl_pwm_config, | |
296 | .enable = twl6030_pwm_enable, | |
297 | .disable = twl6030_pwm_disable, | |
d5714e8b | 298 | .owner = THIS_MODULE, |
3744c263 PU |
299 | }; |
300 | ||
301 | static int twl_pwm_probe(struct platform_device *pdev) | |
302 | { | |
303 | struct twl_pwm_chip *twl; | |
304 | int ret; | |
305 | ||
306 | twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL); | |
307 | if (!twl) | |
308 | return -ENOMEM; | |
309 | ||
310 | if (twl_class_is_4030()) | |
311 | twl->chip.ops = &twl4030_pwm_ops; | |
312 | else | |
313 | twl->chip.ops = &twl6030_pwm_ops; | |
314 | ||
315 | twl->chip.dev = &pdev->dev; | |
316 | twl->chip.base = -1; | |
317 | twl->chip.npwm = 2; | |
2e2a0f6e | 318 | twl->chip.can_sleep = true; |
3744c263 PU |
319 | |
320 | mutex_init(&twl->mutex); | |
321 | ||
322 | ret = pwmchip_add(&twl->chip); | |
323 | if (ret < 0) | |
324 | return ret; | |
325 | ||
326 | platform_set_drvdata(pdev, twl); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static int twl_pwm_remove(struct platform_device *pdev) | |
332 | { | |
333 | struct twl_pwm_chip *twl = platform_get_drvdata(pdev); | |
334 | ||
335 | return pwmchip_remove(&twl->chip); | |
336 | } | |
337 | ||
338 | #ifdef CONFIG_OF | |
f1a8870a | 339 | static const struct of_device_id twl_pwm_of_match[] = { |
3744c263 PU |
340 | { .compatible = "ti,twl4030-pwm" }, |
341 | { .compatible = "ti,twl6030-pwm" }, | |
342 | { }, | |
343 | }; | |
344 | MODULE_DEVICE_TABLE(of, twl_pwm_of_match); | |
345 | #endif | |
346 | ||
347 | static struct platform_driver twl_pwm_driver = { | |
348 | .driver = { | |
349 | .name = "twl-pwm", | |
350 | .of_match_table = of_match_ptr(twl_pwm_of_match), | |
351 | }, | |
352 | .probe = twl_pwm_probe, | |
353 | .remove = twl_pwm_remove, | |
354 | }; | |
355 | module_platform_driver(twl_pwm_driver); | |
356 | ||
357 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
358 | MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030"); | |
359 | MODULE_ALIAS("platform:twl-pwm"); | |
360 | MODULE_LICENSE("GPL"); |