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12fa8803b6
This prepares the pwm-twol driver to further changes of the pwm core outlined in the commit introducing devm_pwmchip_alloc(). There is no intended semantical change and the driver should behave as before. Link: https://lore.kernel.org/r/c65e796d46df71cd8d0d0941921997b9501f1cb3.1707900770.git.u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
382 lines
9.4 KiB
C
382 lines
9.4 KiB
C
// 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 <peter.ujfalusi@ti.com>
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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 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 pwmchip_get_drvdata(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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u64 duty_ns, u64 period_ns)
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{
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int duty_cycle = DIV64_U64_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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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(pwmchip_parent(chip), "%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 int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
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const struct pwm_state *state)
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{
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int err;
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if (state->polarity != PWM_POLARITY_NORMAL)
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return -EINVAL;
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if (!state->enabled) {
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if (pwm->state.enabled)
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twl4030_pwm_disable(chip, pwm);
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return 0;
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}
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err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
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if (err)
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return err;
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if (!pwm->state.enabled)
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err = twl4030_pwm_enable(chip, pwm);
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return err;
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}
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static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
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const struct pwm_state *state)
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{
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int err;
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if (state->polarity != PWM_POLARITY_NORMAL)
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return -EINVAL;
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if (!state->enabled) {
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if (pwm->state.enabled)
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twl6030_pwm_disable(chip, pwm);
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return 0;
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}
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err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
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if (err)
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return err;
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if (!pwm->state.enabled)
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err = twl6030_pwm_enable(chip, pwm);
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return err;
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}
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static const struct pwm_ops twl4030_pwm_ops = {
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.apply = twl4030_pwm_apply,
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.request = twl4030_pwm_request,
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.free = twl4030_pwm_free,
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};
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static const struct pwm_ops twl6030_pwm_ops = {
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.apply = twl6030_pwm_apply,
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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 pwm_chip *chip;
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struct twl_pwm_chip *twl;
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chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*twl));
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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twl = to_twl(chip);
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if (twl_class_is_4030())
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chip->ops = &twl4030_pwm_ops;
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else
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chip->ops = &twl6030_pwm_ops;
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mutex_init(&twl->mutex);
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return devm_pwmchip_add(&pdev->dev, 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 <peter.ujfalusi@ti.com>");
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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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