rk_pwm.c
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/*
* Copyright (c) 2016 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <div64.h>
#include <dm.h>
#include <pwm.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch/pwm.h>
#include <power/regulator.h>
DECLARE_GLOBAL_DATA_PTR;
struct rk_pwm_priv {
struct rk3288_pwm *regs;
ulong freq;
uint enable_conf;
};
static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
debug("%s: polarity=%u\n", __func__, polarity);
priv->enable_conf &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
if (polarity)
priv->enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
else
priv->enable_conf |= 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);
struct rk3288_pwm *regs = priv->regs;
unsigned long period, duty;
debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
PWM_CONTINUOUS | priv->enable_conf |
RK_PWM_DISABLE,
®s->ctrl);
period = lldiv((uint64_t)(priv->freq / 1000) * period_ns, 1000000);
duty = lldiv((uint64_t)(priv->freq / 1000) * duty_ns, 1000000);
writel(period, ®s->period_hpr);
writel(duty, ®s->duty_lpr);
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);
struct rk3288_pwm *regs = priv->regs;
debug("%s: Enable '%s'\n", __func__, dev->name);
clrsetbits_le32(®s->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
return 0;
}
static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
{
struct rk_pwm_priv *priv = dev_get_priv(dev);
priv->regs = (struct rk3288_pwm *)devfdt_get_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->enable_conf = 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 udevice_id rk_pwm_ids[] = {
{ .compatible = "rockchip,rk3288-pwm" },
{ }
};
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),
};