| /* |
| * Driver for TWL4030/6030 Generic Pulse Width Modulator |
| * |
| * Copyright (C) 2012 Texas Instruments |
| * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/pwm.h> |
| #include <linux/i2c/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, |
| int duty_ns, int period_ns) |
| { |
| int duty_cycle = DIV_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 = container_of(chip, struct twl_pwm_chip, |
| 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 = container_of(chip, struct twl_pwm_chip, |
| 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 0; |
| } |
| |
| static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) |
| { |
| struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip, |
| 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 read TOGGLE3\n", pwm->label); |
| goto out; |
| } |
| |
| 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; |
| } |
| |
| twl->twl6030_toggle3 = val; |
| out: |
| mutex_unlock(&twl->mutex); |
| } |
| |
| static const struct pwm_ops twl4030_pwm_ops = { |
| .config = twl_pwm_config, |
| .enable = twl4030_pwm_enable, |
| .disable = twl4030_pwm_disable, |
| .request = twl4030_pwm_request, |
| .free = twl4030_pwm_free, |
| }; |
| |
| static const struct pwm_ops twl6030_pwm_ops = { |
| .config = twl_pwm_config, |
| .enable = twl6030_pwm_enable, |
| .disable = twl6030_pwm_disable, |
| }; |
| |
| static int twl_pwm_probe(struct platform_device *pdev) |
| { |
| struct twl_pwm_chip *twl; |
| int ret; |
| |
| 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.base = -1; |
| twl->chip.npwm = 2; |
| twl->chip.can_sleep = true; |
| |
| mutex_init(&twl->mutex); |
| |
| ret = pwmchip_add(&twl->chip); |
| if (ret < 0) |
| return ret; |
| |
| platform_set_drvdata(pdev, twl); |
| |
| return 0; |
| } |
| |
| static int twl_pwm_remove(struct platform_device *pdev) |
| { |
| struct twl_pwm_chip *twl = platform_get_drvdata(pdev); |
| |
| return pwmchip_remove(&twl->chip); |
| } |
| |
| #ifdef CONFIG_OF |
| static 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, |
| .remove = twl_pwm_remove, |
| }; |
| 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"); |