pwm-twl.c 8.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  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>
  7. */
  8. #include <linux/module.h>
  9. #include <linux/of.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/pwm.h>
  12. #include <linux/mfd/twl.h>
  13. #include <linux/slab.h>
  14. /*
  15. * This driver handles the PWMs of TWL4030 and TWL6030.
  16. * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
  17. * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
  18. */
  19. #define TWL_PWM_MAX 0x7f
  20. /* Registers, bits and macro for TWL4030 */
  21. #define TWL4030_GPBR1_REG 0x0c
  22. #define TWL4030_PMBR1_REG 0x0d
  23. /* GPBR1 register bits */
  24. #define TWL4030_PWMXCLK_ENABLE (1 << 0)
  25. #define TWL4030_PWMX_ENABLE (1 << 2)
  26. #define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
  27. #define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
  28. /* PMBR1 register bits */
  29. #define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
  30. #define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
  31. #define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
  32. #define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
  33. /* Register, bits and macro for TWL6030 */
  34. #define TWL6030_TOGGLE3_REG 0x92
  35. #define TWL6030_PWMXR (1 << 0)
  36. #define TWL6030_PWMXS (1 << 1)
  37. #define TWL6030_PWMXEN (1 << 2)
  38. #define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
  39. struct twl_pwm_chip {
  40. struct pwm_chip chip;
  41. struct mutex mutex;
  42. u8 twl6030_toggle3;
  43. u8 twl4030_pwm_mux;
  44. };
  45. static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
  46. {
  47. return container_of(chip, struct twl_pwm_chip, chip);
  48. }
  49. static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
  50. int duty_ns, int period_ns)
  51. {
  52. int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
  53. u8 pwm_config[2] = { 1, 0 };
  54. int base, ret;
  55. /*
  56. * To configure the duty period:
  57. * On-cycle is set to 1 (the minimum allowed value)
  58. * The off time of 0 is not configurable, so the mapping is:
  59. * 0 -> off cycle = 2,
  60. * 1 -> off cycle = 2,
  61. * 2 -> off cycle = 3,
  62. * 126 - > off cycle 127,
  63. * 127 - > off cycle 1
  64. * When on cycle == off cycle the PWM will be always on
  65. */
  66. if (duty_cycle == 1)
  67. duty_cycle = 2;
  68. else if (duty_cycle > TWL_PWM_MAX)
  69. duty_cycle = 1;
  70. base = pwm->hwpwm * 3;
  71. pwm_config[1] = duty_cycle;
  72. ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
  73. if (ret < 0)
  74. dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
  75. return ret;
  76. }
  77. static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
  78. {
  79. struct twl_pwm_chip *twl = to_twl(chip);
  80. int ret;
  81. u8 val;
  82. mutex_lock(&twl->mutex);
  83. ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
  84. if (ret < 0) {
  85. dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
  86. goto out;
  87. }
  88. val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
  89. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
  90. if (ret < 0)
  91. dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
  92. val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
  93. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
  94. if (ret < 0)
  95. dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
  96. out:
  97. mutex_unlock(&twl->mutex);
  98. return ret;
  99. }
  100. static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
  101. {
  102. struct twl_pwm_chip *twl = to_twl(chip);
  103. int ret;
  104. u8 val;
  105. mutex_lock(&twl->mutex);
  106. ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
  107. if (ret < 0) {
  108. dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
  109. goto out;
  110. }
  111. val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
  112. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
  113. if (ret < 0)
  114. dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
  115. val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
  116. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
  117. if (ret < 0)
  118. dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
  119. out:
  120. mutex_unlock(&twl->mutex);
  121. }
  122. static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
  123. {
  124. struct twl_pwm_chip *twl = to_twl(chip);
  125. int ret;
  126. u8 val, mask, bits;
  127. if (pwm->hwpwm == 1) {
  128. mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
  129. bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
  130. } else {
  131. mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
  132. bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
  133. }
  134. mutex_lock(&twl->mutex);
  135. ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
  136. if (ret < 0) {
  137. dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
  138. goto out;
  139. }
  140. /* Save the current MUX configuration for the PWM */
  141. twl->twl4030_pwm_mux &= ~mask;
  142. twl->twl4030_pwm_mux |= (val & mask);
  143. /* Select PWM functionality */
  144. val &= ~mask;
  145. val |= bits;
  146. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
  147. if (ret < 0)
  148. dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
  149. out:
  150. mutex_unlock(&twl->mutex);
  151. return ret;
  152. }
  153. static void twl4030_pwm_free(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;
  158. if (pwm->hwpwm == 1)
  159. mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
  160. else
  161. mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
  162. mutex_lock(&twl->mutex);
  163. ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
  164. if (ret < 0) {
  165. dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
  166. goto out;
  167. }
  168. /* Restore the MUX configuration for the PWM */
  169. val &= ~mask;
  170. val |= (twl->twl4030_pwm_mux & mask);
  171. ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
  172. if (ret < 0)
  173. dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
  174. out:
  175. mutex_unlock(&twl->mutex);
  176. }
  177. static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
  178. {
  179. struct twl_pwm_chip *twl = to_twl(chip);
  180. int ret;
  181. u8 val;
  182. mutex_lock(&twl->mutex);
  183. val = twl->twl6030_toggle3;
  184. val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
  185. val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
  186. ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
  187. if (ret < 0) {
  188. dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
  189. goto out;
  190. }
  191. twl->twl6030_toggle3 = val;
  192. out:
  193. mutex_unlock(&twl->mutex);
  194. return ret;
  195. }
  196. static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
  197. {
  198. struct twl_pwm_chip *twl = to_twl(chip);
  199. int ret;
  200. u8 val;
  201. mutex_lock(&twl->mutex);
  202. val = twl->twl6030_toggle3;
  203. val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
  204. val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
  205. ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
  206. if (ret < 0) {
  207. dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
  208. goto out;
  209. }
  210. val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
  211. ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
  212. if (ret < 0) {
  213. dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
  214. goto out;
  215. }
  216. val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
  217. ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
  218. if (ret < 0) {
  219. dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
  220. goto out;
  221. }
  222. twl->twl6030_toggle3 = val;
  223. out:
  224. mutex_unlock(&twl->mutex);
  225. }
  226. static const struct pwm_ops twl4030_pwm_ops = {
  227. .config = twl_pwm_config,
  228. .enable = twl4030_pwm_enable,
  229. .disable = twl4030_pwm_disable,
  230. .request = twl4030_pwm_request,
  231. .free = twl4030_pwm_free,
  232. .owner = THIS_MODULE,
  233. };
  234. static const struct pwm_ops twl6030_pwm_ops = {
  235. .config = twl_pwm_config,
  236. .enable = twl6030_pwm_enable,
  237. .disable = twl6030_pwm_disable,
  238. .owner = THIS_MODULE,
  239. };
  240. static int twl_pwm_probe(struct platform_device *pdev)
  241. {
  242. struct twl_pwm_chip *twl;
  243. int ret;
  244. twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
  245. if (!twl)
  246. return -ENOMEM;
  247. if (twl_class_is_4030())
  248. twl->chip.ops = &twl4030_pwm_ops;
  249. else
  250. twl->chip.ops = &twl6030_pwm_ops;
  251. twl->chip.dev = &pdev->dev;
  252. twl->chip.base = -1;
  253. twl->chip.npwm = 2;
  254. mutex_init(&twl->mutex);
  255. ret = pwmchip_add(&twl->chip);
  256. if (ret < 0)
  257. return ret;
  258. platform_set_drvdata(pdev, twl);
  259. return 0;
  260. }
  261. static int twl_pwm_remove(struct platform_device *pdev)
  262. {
  263. struct twl_pwm_chip *twl = platform_get_drvdata(pdev);
  264. return pwmchip_remove(&twl->chip);
  265. }
  266. #ifdef CONFIG_OF
  267. static const struct of_device_id twl_pwm_of_match[] = {
  268. { .compatible = "ti,twl4030-pwm" },
  269. { .compatible = "ti,twl6030-pwm" },
  270. { },
  271. };
  272. MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
  273. #endif
  274. static struct platform_driver twl_pwm_driver = {
  275. .driver = {
  276. .name = "twl-pwm",
  277. .of_match_table = of_match_ptr(twl_pwm_of_match),
  278. },
  279. .probe = twl_pwm_probe,
  280. .remove = twl_pwm_remove,
  281. };
  282. module_platform_driver(twl_pwm_driver);
  283. MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  284. MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
  285. MODULE_ALIAS("platform:twl-pwm");
  286. MODULE_LICENSE("GPL");