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340 lines
8.5 KiB
340 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for TWL4030/6030 Generic Pulse Width Modulator |
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* |
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* Copyright (C) 2012 Texas Instruments |
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* Author: Peter Ujfalusi <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pwm.h> |
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#include <linux/mfd/twl.h> |
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#include <linux/slab.h> |
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/* |
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* This driver handles the PWMs of TWL4030 and TWL6030. |
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* The TRM names for the PWMs on TWL4030 are: PWM0, PWM1 |
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* TWL6030 also have two PWMs named in the TRM as PWM1, PWM2 |
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*/ |
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#define TWL_PWM_MAX 0x7f |
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/* Registers, bits and macro for TWL4030 */ |
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#define TWL4030_GPBR1_REG 0x0c |
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#define TWL4030_PMBR1_REG 0x0d |
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/* GPBR1 register bits */ |
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#define TWL4030_PWMXCLK_ENABLE (1 << 0) |
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#define TWL4030_PWMX_ENABLE (1 << 2) |
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#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE) |
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#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm)) |
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/* PMBR1 register bits */ |
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#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2) |
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#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2) |
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#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4) |
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#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4) |
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/* Register, bits and macro for TWL6030 */ |
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#define TWL6030_TOGGLE3_REG 0x92 |
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#define TWL6030_PWMXR (1 << 0) |
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#define TWL6030_PWMXS (1 << 1) |
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#define TWL6030_PWMXEN (1 << 2) |
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#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3)) |
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struct twl_pwm_chip { |
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struct pwm_chip chip; |
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struct mutex mutex; |
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u8 twl6030_toggle3; |
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u8 twl4030_pwm_mux; |
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}; |
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static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip) |
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{ |
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return container_of(chip, struct twl_pwm_chip, chip); |
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} |
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static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, |
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int duty_ns, int period_ns) |
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{ |
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int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1; |
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u8 pwm_config[2] = { 1, 0 }; |
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int base, ret; |
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/* |
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* To configure the duty period: |
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* On-cycle is set to 1 (the minimum allowed value) |
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* The off time of 0 is not configurable, so the mapping is: |
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* 0 -> off cycle = 2, |
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* 1 -> off cycle = 2, |
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* 2 -> off cycle = 3, |
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* 126 - > off cycle 127, |
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* 127 - > off cycle 1 |
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* When on cycle == off cycle the PWM will be always on |
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*/ |
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if (duty_cycle == 1) |
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duty_cycle = 2; |
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else if (duty_cycle > TWL_PWM_MAX) |
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duty_cycle = 1; |
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base = pwm->hwpwm * 3; |
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pwm_config[1] = duty_cycle; |
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ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label); |
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return ret; |
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} |
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static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); |
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goto out; |
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} |
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val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); |
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val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label); |
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goto out; |
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} |
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val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val, mask, bits; |
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if (pwm->hwpwm == 1) { |
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mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; |
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bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1; |
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} else { |
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mask = TWL4030_GPIO6_PWM0_MUTE_MASK; |
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bits = TWL4030_GPIO6_PWM0_MUTE_PWM0; |
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} |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); |
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goto out; |
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} |
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/* Save the current MUX configuration for the PWM */ |
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twl->twl4030_pwm_mux &= ~mask; |
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twl->twl4030_pwm_mux |= (val & mask); |
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/* Select PWM functionality */ |
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val &= ~mask; |
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val |= bits; |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val, mask; |
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if (pwm->hwpwm == 1) |
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mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK; |
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else |
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mask = TWL4030_GPIO6_PWM0_MUTE_MASK; |
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mutex_lock(&twl->mutex); |
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ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label); |
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goto out; |
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} |
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/* Restore the MUX configuration for the PWM */ |
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val &= ~mask; |
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val |= (twl->twl4030_pwm_mux & mask); |
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ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label); |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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val = twl->twl6030_toggle3; |
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val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); |
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val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label); |
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goto out; |
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} |
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twl->twl6030_toggle3 = val; |
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out: |
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mutex_unlock(&twl->mutex); |
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return ret; |
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} |
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static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) |
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{ |
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struct twl_pwm_chip *twl = to_twl(chip); |
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int ret; |
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u8 val; |
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mutex_lock(&twl->mutex); |
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val = twl->twl6030_toggle3; |
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val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR); |
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val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN); |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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goto out; |
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} |
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val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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goto out; |
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} |
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val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN); |
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ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG); |
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if (ret < 0) { |
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dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label); |
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goto out; |
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} |
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twl->twl6030_toggle3 = val; |
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out: |
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mutex_unlock(&twl->mutex); |
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} |
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static const struct pwm_ops twl4030_pwm_ops = { |
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.config = twl_pwm_config, |
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.enable = twl4030_pwm_enable, |
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.disable = twl4030_pwm_disable, |
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.request = twl4030_pwm_request, |
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.free = twl4030_pwm_free, |
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.owner = THIS_MODULE, |
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}; |
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static const struct pwm_ops twl6030_pwm_ops = { |
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.config = twl_pwm_config, |
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.enable = twl6030_pwm_enable, |
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.disable = twl6030_pwm_disable, |
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.owner = THIS_MODULE, |
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}; |
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static int twl_pwm_probe(struct platform_device *pdev) |
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{ |
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struct twl_pwm_chip *twl; |
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twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL); |
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if (!twl) |
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return -ENOMEM; |
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if (twl_class_is_4030()) |
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twl->chip.ops = &twl4030_pwm_ops; |
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else |
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twl->chip.ops = &twl6030_pwm_ops; |
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twl->chip.dev = &pdev->dev; |
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twl->chip.npwm = 2; |
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mutex_init(&twl->mutex); |
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return devm_pwmchip_add(&pdev->dev, &twl->chip); |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id twl_pwm_of_match[] = { |
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{ .compatible = "ti,twl4030-pwm" }, |
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{ .compatible = "ti,twl6030-pwm" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, twl_pwm_of_match); |
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#endif |
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static struct platform_driver twl_pwm_driver = { |
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.driver = { |
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.name = "twl-pwm", |
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.of_match_table = of_match_ptr(twl_pwm_of_match), |
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}, |
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.probe = twl_pwm_probe, |
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}; |
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module_platform_driver(twl_pwm_driver); |
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MODULE_AUTHOR("Peter Ujfalusi <[email protected]>"); |
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MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030"); |
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MODULE_ALIAS("platform:twl-pwm"); |
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MODULE_LICENSE("GPL");
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