u-boot/drivers/pwm/rk_pwm.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

117 lines
2.8 KiB
C

// 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 <pwm.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch/pwm.h>
#include <power/regulator.h>
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,
&regs->ctrl);
period = lldiv((uint64_t)(priv->freq / 1000) * period_ns, 1000000);
duty = lldiv((uint64_t)(priv->freq / 1000) * duty_ns, 1000000);
writel(period, &regs->period_hpr);
writel(duty, &regs->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(&regs->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 *)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->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),
};