mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Uwe Kleine-König](/assets/img/avatar_default.png)
To eventually get rid of all legacy drivers convert this driver to the modern world implementing .apply(). This just pushes down a slightly optimized variant of how legacy drivers are handled in the core. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
386 lines
9.3 KiB
C
386 lines
9.3 KiB
C
// 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");
|