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linux-stable/drivers/pwm/pwm-twl.c
Uwe Kleine-König f9a8ee8c8b pwm: Always allocate PWM chip base ID dynamically 
Since commit 5e5da1e9fb ("pwm: ab8500: Explicitly allocate pwm chip
base dynamically") all drivers use dynamic ID allocation explicitly. New
drivers are supposed to do the same, so remove support for driver
specified base IDs and drop all assignments in the low-level drivers.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2021-03-22 11:53:00 +01:00

355 lines
8.8 KiB
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// 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,
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 = 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 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,
.owner = THIS_MODULE,
};
static const struct pwm_ops twl6030_pwm_ops = {
.config = twl_pwm_config,
.enable = twl6030_pwm_enable,
.disable = twl6030_pwm_disable,
.owner = THIS_MODULE,
};
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.npwm = 2;
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 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,
.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");
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