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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <clk.h>
#include <div64.h>
#include <dm.h>
#include <log.h>
#include <pwm.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch-rockchip/pwm.h>
#include <power/regulator.h>
DECLARE_GLOBAL_DATA_PTR;
struct rockchip_pwm_data {
struct rockchip_pwm_regs regs;
unsigned int prescaler;
bool supports_polarity;
bool supports_lock;
u32 enable_conf;
u32 enable_conf_mask;
};
struct rk_pwm_priv {
fdt_addr_t base;
ulong freq;
u32 conf_polarity;
const struct rockchip_pwm_data *data;
};
static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
if (!priv->data->supports_polarity) {
debug("%s: Do not support polarity\n", __func__);
return 0;
}
debug("%s: polarity=%u\n", __func__, polarity);
if (polarity)
priv->conf_polarity = PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
else
priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
return 0;
}
static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
uint duty_ns)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
const struct rockchip_pwm_regs *regs = &priv->data->regs;
unsigned long period, duty;
u32 ctrl;
debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
ctrl = readl(priv->base + regs->ctrl);
/*
* Lock the period and duty of previous configuration, then
* change the duty and period, that would not be effective.
*/
if (priv->data->supports_lock) {
ctrl |= PWM_LOCK;
writel(ctrl, priv->base + regs->ctrl);
}
period = lldiv((uint64_t)priv->freq * period_ns,
priv->data->prescaler * 1000000000);
duty = lldiv((uint64_t)priv->freq * duty_ns,
priv->data->prescaler * 1000000000);
writel(period, priv->base + regs->period);
writel(duty, priv->base + regs->duty);
if (priv->data->supports_polarity) {
ctrl &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
ctrl |= priv->conf_polarity;
}
/*
* Unlock and set polarity at the same time,
* the configuration of duty, period and polarity
* would be effective together at next period.
*/
if (priv->data->supports_lock)
ctrl &= ~PWM_LOCK;
writel(ctrl, priv->base + regs->ctrl);
debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
return 0;
}
static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
const struct rockchip_pwm_regs *regs = &priv->data->regs;
u32 ctrl;
debug("%s: Enable '%s'\n", __func__, dev->name);
ctrl = readl(priv->base + regs->ctrl);
ctrl &= ~priv->data->enable_conf_mask;
if (enable)
ctrl |= priv->data->enable_conf;
else
ctrl &= ~priv->data->enable_conf;
writel(ctrl, priv->base + regs->ctrl);
return 0;
}
static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr(dev);
return 0;
}
static int rk_pwm_probe(struct udevice *dev)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
struct clk clk;
int ret = 0;
ret = clk_get_by_index(dev, 0, &clk);
if (ret < 0) {
debug("%s get clock fail!\n", __func__);
return -EINVAL;
}
priv->freq = clk_get_rate(&clk);
priv->data = (struct rockchip_pwm_data *)dev_get_driver_data(dev);
if (priv->data->supports_polarity)
priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE;
return 0;
}
static const struct pwm_ops rk_pwm_ops = {
.set_invert = rk_pwm_set_invert,
.set_config = rk_pwm_set_config,
.set_enable = rk_pwm_set_enable,
};
static const struct rockchip_pwm_data pwm_data_v1 = {
.regs = {
.duty = 0x04,
.period = 0x08,
.cntr = 0x00,
.ctrl = 0x0c,
},
.prescaler = 2,
.supports_polarity = false,
.supports_lock = false,
.enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN,
.enable_conf_mask = BIT(1) | BIT(3),
};
static const struct rockchip_pwm_data pwm_data_v2 = {
.regs = {
.duty = 0x08,
.period = 0x04,
.cntr = 0x00,
.ctrl = 0x0c,
},
.prescaler = 1,
.supports_polarity = true,
.supports_lock = false,
.enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
PWM_CONTINUOUS,
.enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
};
static const struct rockchip_pwm_data pwm_data_v3 = {
.regs = {
.duty = 0x08,
.period = 0x04,
.cntr = 0x00,
.ctrl = 0x0c,
},
.prescaler = 1,
.supports_polarity = true,
.supports_lock = true,
.enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
PWM_CONTINUOUS,
.enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
};
static const struct udevice_id rk_pwm_ids[] = {
{ .compatible = "rockchip,rk2928-pwm", .data = (ulong)&pwm_data_v1},
{ .compatible = "rockchip,rk3288-pwm", .data = (ulong)&pwm_data_v2},
{ .compatible = "rockchip,rk3328-pwm", .data = (ulong)&pwm_data_v3},
{ }
};
U_BOOT_DRIVER(rk_pwm) = {
.name = "rk_pwm",
.id = UCLASS_PWM,
.of_match = rk_pwm_ids,
.ops = &rk_pwm_ops,
.ofdata_to_platdata = rk_pwm_ofdata_to_platdata,
.probe = rk_pwm_probe,
.priv_auto_alloc_size = sizeof(struct rk_pwm_priv),
};
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