Commit | Line | Data |
---|---|---|
caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3744c263 PU |
2 | /* |
3 | * Driver for TWL4030/6030 Generic Pulse Width Modulator | |
4 | * | |
5 | * Copyright (C) 2012 Texas Instruments | |
6 | * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> | |
3744c263 PU |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
ea8eeb15 | 10 | #include <linux/of.h> |
3744c263 PU |
11 | #include <linux/platform_device.h> |
12 | #include <linux/pwm.h> | |
a2054256 | 13 | #include <linux/mfd/twl.h> |
3744c263 PU |
14 | #include <linux/slab.h> |
15 | ||
16 | /* | |
17 | * This driver handles the PWMs of TWL4030 and TWL6030. | |
18 | * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1 | |
19 | * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2 | |
20 | */ | |
21 | ||
22 | #define TWL_PWM_MAX 0x7f | |
23 | ||
24 | /* Registers, bits and macro for TWL4030 */ | |
25 | #define TWL4030_GPBR1_REG 0x0c | |
26 | #define TWL4030_PMBR1_REG 0x0d | |
27 | ||
28 | /* GPBR1 register bits */ | |
29 | #define TWL4030_PWMXCLK_ENABLE (1 << 0) | |
30 | #define TWL4030_PWMX_ENABLE (1 << 2) | |
31 | #define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE) | |
32 | #define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm)) | |
33 | ||
34 | /* PMBR1 register bits */ | |
35 | #define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2) | |
36 | #define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2) | |
37 | #define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4) | |
38 | #define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4) | |
39 | ||
40 | /* Register, bits and macro for TWL6030 */ | |
41 | #define TWL6030_TOGGLE3_REG 0x92 | |
42 | ||
43 | #define TWL6030_PWMXR (1 << 0) | |
44 | #define TWL6030_PWMXS (1 << 1) | |
45 | #define TWL6030_PWMXEN (1 << 2) | |
46 | #define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3)) | |
47 | ||
48 | struct twl_pwm_chip { | |
49 | struct pwm_chip chip; | |
50 | struct mutex mutex; | |
51 | u8 twl6030_toggle3; | |
52 | u8 twl4030_pwm_mux; | |
53 | }; | |
54 | ||
55 | static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip) | |
56 | { | |
57 | return container_of(chip, struct twl_pwm_chip, chip); | |
58 | } | |
59 | ||
60 | static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, | |
61 | int duty_ns, int period_ns) | |
62 | { | |
63 | int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1; | |
64 | u8 pwm_config[2] = { 1, 0 }; | |
65 | int base, ret; | |
66 | ||
67 | /* | |
68 | * To configure the duty period: | |
69 | * On-cycle is set to 1 (the minimum allowed value) | |
70 | * The off time of 0 is not configurable, so the mapping is: | |
71 | * 0 -> off cycle = 2, | |
72 | * 1 -> off cycle = 2, | |
73 | * 2 -> off cycle = 3, | |
74 | * 126 - > off cycle 127, | |
75 | * 127 - > off cycle 1 | |
76 | * When on cycle == off cycle the PWM will be always on | |
77 | */ | |
78 | if (duty_cycle == 1) | |
79 | duty_cycle = 2; | |
80 | else if (duty_cycle > TWL_PWM_MAX) | |
81 | duty_cycle = 1; | |
82 | ||
83 | base = pwm->hwpwm * 3; | |
84 | ||
85 | pwm_config[1] = duty_cycle; | |
86 | ||
87 | ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2); | |
88 | if (ret < 0) | |
89 | dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
94 | static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
95 | { | |
96 | struct twl_pwm_chip *twl = to_twl(chip); | |
97 | int ret; | |
98 | u8 val; | |
99 | ||
100 | mutex_lock(&twl->mutex); | |
101 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); | |
102 | if (ret < 0) { | |
103 | dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); | |
104 | goto out; | |
105 | } | |
106 | ||
107 | val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); | |
108 | ||
109 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
110 | if (ret < 0) | |
111 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
112 | ||
113 | val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); | |
114 | ||
115 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
116 | if (ret < 0) | |
117 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
118 | ||
119 | out: | |
120 | mutex_unlock(&twl->mutex); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) | |
125 | { | |
126 | struct twl_pwm_chip *twl = to_twl(chip); | |
127 | int ret; | |
128 | u8 val; | |
129 | ||
130 | mutex_lock(&twl->mutex); | |
131 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); | |
132 | if (ret < 0) { | |
133 | dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); | |
134 | goto out; | |
135 | } | |
136 | ||
137 | val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); | |
138 | ||
139 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
140 | if (ret < 0) | |
141 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
142 | ||
143 | val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); | |
144 | ||
145 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); | |
146 | if (ret < 0) | |
147 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
148 | ||
149 | out: | |
150 | mutex_unlock(&twl->mutex); | |
151 | } | |
152 | ||
153 | static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) | |
154 | { | |
155 | struct twl_pwm_chip *twl = to_twl(chip); | |
156 | int ret; | |
157 | u8 val, mask, bits; | |
158 | ||
159 | if (pwm->hwpwm == 1) { | |
160 | mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; | |
161 | bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1; | |
162 | } else { | |
163 | mask = TWL4030_GPIO6_PWM0_MUTE_MASK; | |
164 | bits = TWL4030_GPIO6_PWM0_MUTE_PWM0; | |
165 | } | |
166 | ||
167 | mutex_lock(&twl->mutex); | |
168 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); | |
169 | if (ret < 0) { | |
170 | dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); | |
171 | goto out; | |
172 | } | |
173 | ||
174 | /* Save the current MUX configuration for the PWM */ | |
175 | twl->twl4030_pwm_mux &= ~mask; | |
176 | twl->twl4030_pwm_mux |= (val & mask); | |
177 | ||
178 | /* Select PWM functionality */ | |
179 | val &= ~mask; | |
180 | val |= bits; | |
181 | ||
182 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); | |
183 | if (ret < 0) | |
184 | dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); | |
185 | ||
186 | out: | |
187 | mutex_unlock(&twl->mutex); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) | |
192 | { | |
30f78617 | 193 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
194 | int ret; |
195 | u8 val, mask; | |
196 | ||
197 | if (pwm->hwpwm == 1) | |
198 | mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; | |
199 | else | |
200 | mask = TWL4030_GPIO6_PWM0_MUTE_MASK; | |
201 | ||
202 | mutex_lock(&twl->mutex); | |
203 | ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); | |
204 | if (ret < 0) { | |
205 | dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); | |
206 | goto out; | |
207 | } | |
208 | ||
209 | /* Restore the MUX configuration for the PWM */ | |
210 | val &= ~mask; | |
211 | val |= (twl->twl4030_pwm_mux & mask); | |
212 | ||
213 | ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); | |
214 | if (ret < 0) | |
215 | dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); | |
216 | ||
217 | out: | |
218 | mutex_unlock(&twl->mutex); | |
219 | } | |
220 | ||
221 | static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) | |
222 | { | |
30f78617 | 223 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
224 | int ret; |
225 | u8 val; | |
226 | ||
227 | mutex_lock(&twl->mutex); | |
228 | val = twl->twl6030_toggle3; | |
229 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
230 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
231 | ||
232 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
233 | if (ret < 0) { | |
234 | dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); | |
235 | goto out; | |
236 | } | |
237 | ||
238 | twl->twl6030_toggle3 = val; | |
239 | out: | |
240 | mutex_unlock(&twl->mutex); | |
c8e4df31 | 241 | return ret; |
3744c263 PU |
242 | } |
243 | ||
244 | static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) | |
245 | { | |
30f78617 | 246 | struct twl_pwm_chip *twl = to_twl(chip); |
3744c263 PU |
247 | int ret; |
248 | u8 val; | |
249 | ||
250 | mutex_lock(&twl->mutex); | |
251 | val = twl->twl6030_toggle3; | |
252 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); | |
253 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); | |
254 | ||
3744c263 PU |
255 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); |
256 | if (ret < 0) { | |
257 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
258 | goto out; | |
259 | } | |
260 | ||
45c0ce84 PK |
261 | val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); |
262 | ||
263 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
264 | if (ret < 0) { | |
265 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
266 | goto out; | |
267 | } | |
268 | ||
269 | val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); | |
270 | ||
271 | ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); | |
272 | if (ret < 0) { | |
273 | dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); | |
274 | goto out; | |
275 | } | |
276 | ||
3744c263 PU |
277 | twl->twl6030_toggle3 = val; |
278 | out: | |
279 | mutex_unlock(&twl->mutex); | |
280 | } | |
281 | ||
282 | static const struct pwm_ops twl4030_pwm_ops = { | |
283 | .config = twl_pwm_config, | |
284 | .enable = twl4030_pwm_enable, | |
285 | .disable = twl4030_pwm_disable, | |
286 | .request = twl4030_pwm_request, | |
287 | .free = twl4030_pwm_free, | |
d5714e8b | 288 | .owner = THIS_MODULE, |
3744c263 PU |
289 | }; |
290 | ||
291 | static const struct pwm_ops twl6030_pwm_ops = { | |
292 | .config = twl_pwm_config, | |
293 | .enable = twl6030_pwm_enable, | |
294 | .disable = twl6030_pwm_disable, | |
d5714e8b | 295 | .owner = THIS_MODULE, |
3744c263 PU |
296 | }; |
297 | ||
298 | static 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; | |
3744c263 PU |
313 | twl->chip.npwm = 2; |
314 | ||
315 | mutex_init(&twl->mutex); | |
316 | ||
317 | ret = pwmchip_add(&twl->chip); | |
318 | if (ret < 0) | |
319 | return ret; | |
320 | ||
321 | platform_set_drvdata(pdev, twl); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int twl_pwm_remove(struct platform_device *pdev) | |
327 | { | |
328 | struct twl_pwm_chip *twl = platform_get_drvdata(pdev); | |
329 | ||
330 | return pwmchip_remove(&twl->chip); | |
331 | } | |
332 | ||
333 | #ifdef CONFIG_OF | |
f1a8870a | 334 | static const struct of_device_id twl_pwm_of_match[] = { |
3744c263 PU |
335 | { .compatible = "ti,twl4030-pwm" }, |
336 | { .compatible = "ti,twl6030-pwm" }, | |
337 | { }, | |
338 | }; | |
339 | MODULE_DEVICE_TABLE(of, twl_pwm_of_match); | |
340 | #endif | |
341 | ||
342 | static struct platform_driver twl_pwm_driver = { | |
343 | .driver = { | |
344 | .name = "twl-pwm", | |
345 | .of_match_table = of_match_ptr(twl_pwm_of_match), | |
346 | }, | |
347 | .probe = twl_pwm_probe, | |
348 | .remove = twl_pwm_remove, | |
349 | }; | |
350 | module_platform_driver(twl_pwm_driver); | |
351 | ||
352 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
353 | MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030"); | |
354 | MODULE_ALIAS("platform:twl-pwm"); | |
355 | MODULE_LICENSE("GPL"); |