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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 | // SPDX-License-Identifier: GPL-2.0-only /* * Driver for TWL4030/6030 Generic Pulse Width Modulator * * Copyright (C) 2012 Texas Instruments * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> */ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pwm.h> #include <linux/mfd/twl.h> #include <linux/slab.h> /* * This driver handles the PWMs of TWL4030 and TWL6030. * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2 */ #define TWL_PWM_MAX 0x7f /* Registers, bits and macro for TWL4030 */ #define TWL4030_GPBR1_REG 0x0c #define TWL4030_PMBR1_REG 0x0d /* GPBR1 register bits */ #define TWL4030_PWMXCLK_ENABLE (1 << 0) #define TWL4030_PWMX_ENABLE (1 << 2) #define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE) #define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm)) /* PMBR1 register bits */ #define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2) #define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2) #define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4) #define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4) /* Register, bits and macro for TWL6030 */ #define TWL6030_TOGGLE3_REG 0x92 #define TWL6030_PWMXR (1 << 0) #define TWL6030_PWMXS (1 << 1) #define TWL6030_PWMXEN (1 << 2) #define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3)) struct twl_pwm_chip { struct pwm_chip chip; struct mutex mutex; u8 twl6030_toggle3; u8 twl4030_pwm_mux; }; static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip) { return container_of(chip, struct twl_pwm_chip, chip); } static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, u64 duty_ns, u64 period_ns) { int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1; u8 pwm_config[2] = { 1, 0 }; int base, ret; /* * To configure the duty period: * On-cycle is set to 1 (the minimum allowed value) * The off time of 0 is not configurable, so the mapping is: * 0 -> off cycle = 2, * 1 -> off cycle = 2, * 2 -> off cycle = 3, * 126 - > off cycle 127, * 127 - > off cycle 1 * When on cycle == off cycle the PWM will be always on */ if (duty_cycle == 1) duty_cycle = 2; else if (duty_cycle > TWL_PWM_MAX) duty_cycle = 1; base = pwm->hwpwm * 3; pwm_config[1] = duty_cycle; ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2); if (ret < 0) dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); return ret; } static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val; mutex_lock(&twl->mutex); ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); goto out; } val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); out: mutex_unlock(&twl->mutex); return ret; } static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val; mutex_lock(&twl->mutex); ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); goto out; } val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); out: mutex_unlock(&twl->mutex); } static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val, mask, bits; if (pwm->hwpwm == 1) { mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1; } else { mask = TWL4030_GPIO6_PWM0_MUTE_MASK; bits = TWL4030_GPIO6_PWM0_MUTE_PWM0; } mutex_lock(&twl->mutex); ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); goto out; } /* Save the current MUX configuration for the PWM */ twl->twl4030_pwm_mux &= ~mask; twl->twl4030_pwm_mux |= (val & mask); /* Select PWM functionality */ val &= ~mask; val |= bits; ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); out: mutex_unlock(&twl->mutex); return ret; } static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val, mask; if (pwm->hwpwm == 1) mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; else mask = TWL4030_GPIO6_PWM0_MUTE_MASK; mutex_lock(&twl->mutex); ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); goto out; } /* Restore the MUX configuration for the PWM */ val &= ~mask; val |= (twl->twl4030_pwm_mux & mask); ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); if (ret < 0) dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); out: mutex_unlock(&twl->mutex); } static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val; mutex_lock(&twl->mutex); val = twl->twl6030_toggle3; val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); goto out; } twl->twl6030_toggle3 = val; out: mutex_unlock(&twl->mutex); return ret; } static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct twl_pwm_chip *twl = to_twl(chip); int ret; u8 val; mutex_lock(&twl->mutex); val = twl->twl6030_toggle3; val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); goto out; } val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); goto out; } val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); if (ret < 0) { dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); goto out; } twl->twl6030_toggle3 = val; out: mutex_unlock(&twl->mutex); } static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { int err; if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; if (!state->enabled) { if (pwm->state.enabled) twl4030_pwm_disable(chip, pwm); return 0; } err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period); if (err) return err; if (!pwm->state.enabled) err = twl4030_pwm_enable(chip, pwm); return err; } static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { int err; if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; if (!state->enabled) { if (pwm->state.enabled) twl6030_pwm_disable(chip, pwm); return 0; } err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period); if (err) return err; if (!pwm->state.enabled) err = twl6030_pwm_enable(chip, pwm); return err; } static const struct pwm_ops twl4030_pwm_ops = { .apply = twl4030_pwm_apply, .request = twl4030_pwm_request, .free = twl4030_pwm_free, .owner = THIS_MODULE, }; static const struct pwm_ops twl6030_pwm_ops = { .apply = twl6030_pwm_apply, .owner = THIS_MODULE, }; static int twl_pwm_probe(struct platform_device *pdev) { struct twl_pwm_chip *twl; twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL); if (!twl) return -ENOMEM; if (twl_class_is_4030()) twl->chip.ops = &twl4030_pwm_ops; else twl->chip.ops = &twl6030_pwm_ops; twl->chip.dev = &pdev->dev; twl->chip.npwm = 2; mutex_init(&twl->mutex); return devm_pwmchip_add(&pdev->dev, &twl->chip); } #ifdef CONFIG_OF static const struct of_device_id twl_pwm_of_match[] = { { .compatible = "ti,twl4030-pwm" }, { .compatible = "ti,twl6030-pwm" }, { }, }; MODULE_DEVICE_TABLE(of, twl_pwm_of_match); #endif static struct platform_driver twl_pwm_driver = { .driver = { .name = "twl-pwm", .of_match_table = of_match_ptr(twl_pwm_of_match), }, .probe = twl_pwm_probe, }; module_platform_driver(twl_pwm_driver); MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030"); MODULE_ALIAS("platform:twl-pwm"); MODULE_LICENSE("GPL"); |