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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> | |
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 | ||
58 | struct twl_pwm_chip { | |
59 | struct pwm_chip chip; | |
60 | struct mutex mutex; | |
61 | u8 twl6030_toggle3; | |
62 | u8 twl4030_pwm_mux; | |
63 | }; | |
64 | ||
65 | static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip) | |
66 | { | |
67 | return container_of(chip, struct twl_pwm_chip, chip); | |
68 | } | |
69 | ||
70 | static 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 | ||
104 | static 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 | ||
129 | out: | |
130 | mutex_unlock(&twl->mutex); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static 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 | ||
159 | out: | |
160 | mutex_unlock(&twl->mutex); | |
161 | } | |
162 | ||
163 | static 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 | ||
196 | out: | |
197 | mutex_unlock(&twl->mutex); | |
198 | return ret; | |
199 | } | |
200 | ||
201 | static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) | |
202 | { | |
203 | struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip, | |
204 | chip); | |
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 | { | |
234 | struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip, | |
235 | chip); | |
236 | int ret; | |
237 | u8 val; | |
238 | ||
239 | mutex_lock(&twl->mutex); | |
240 | val = twl->twl6030_toggle3; | |
241 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
242 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
243 | ||
244 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
245 | if (ret < 0) { | |
246 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
247 | goto out; | |
248 | } | |
249 | ||
250 | twl->twl6030_toggle3 = val; | |
251 | out: | |
252 | mutex_unlock(&twl->mutex); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) | |
257 | { | |
258 | struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip, | |
259 | chip); | |
260 | int ret; | |
261 | u8 val; | |
262 | ||
263 | mutex_lock(&twl->mutex); | |
264 | val = twl->twl6030_toggle3; | |
265 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
266 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
267 | ||
268 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
269 | if (ret < 0) { | |
270 | dev_err(chip->dev, "%s: Failed to read TOGGLE3\n", pwm->label); | |
271 | goto out; | |
272 | } | |
273 | ||
274 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
275 | ||
276 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
277 | if (ret < 0) { | |
278 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
279 | goto out; | |
280 | } | |
281 | ||
282 | twl->twl6030_toggle3 = val; | |
283 | out: | |
284 | mutex_unlock(&twl->mutex); | |
285 | } | |
286 | ||
287 | static const struct pwm_ops twl4030_pwm_ops = { | |
288 | .config = twl_pwm_config, | |
289 | .enable = twl4030_pwm_enable, | |
290 | .disable = twl4030_pwm_disable, | |
291 | .request = twl4030_pwm_request, | |
292 | .free = twl4030_pwm_free, | |
293 | }; | |
294 | ||
295 | static const struct pwm_ops twl6030_pwm_ops = { | |
296 | .config = twl_pwm_config, | |
297 | .enable = twl6030_pwm_enable, | |
298 | .disable = twl6030_pwm_disable, | |
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; | |
318 | ||
319 | mutex_init(&twl->mutex); | |
320 | ||
321 | ret = pwmchip_add(&twl->chip); | |
322 | if (ret < 0) | |
323 | return ret; | |
324 | ||
325 | platform_set_drvdata(pdev, twl); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | static int twl_pwm_remove(struct platform_device *pdev) | |
331 | { | |
332 | struct twl_pwm_chip *twl = platform_get_drvdata(pdev); | |
333 | ||
334 | return pwmchip_remove(&twl->chip); | |
335 | } | |
336 | ||
337 | #ifdef CONFIG_OF | |
338 | static struct of_device_id twl_pwm_of_match[] = { | |
339 | { .compatible = "ti,twl4030-pwm" }, | |
340 | { .compatible = "ti,twl6030-pwm" }, | |
341 | { }, | |
342 | }; | |
343 | MODULE_DEVICE_TABLE(of, twl_pwm_of_match); | |
344 | #endif | |
345 | ||
346 | static struct platform_driver twl_pwm_driver = { | |
347 | .driver = { | |
348 | .name = "twl-pwm", | |
349 | .of_match_table = of_match_ptr(twl_pwm_of_match), | |
350 | }, | |
351 | .probe = twl_pwm_probe, | |
352 | .remove = twl_pwm_remove, | |
353 | }; | |
354 | module_platform_driver(twl_pwm_driver); | |
355 | ||
356 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
357 | MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030"); | |
358 | MODULE_ALIAS("platform:twl-pwm"); | |
359 | MODULE_LICENSE("GPL"); |