pwm-imx.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*
* Basic support for the pwm module on imx6.
*/
#include <common.h>
#include <div64.h>
#include <dm.h>
#include <pwm.h>
#include <asm/arch/imx-regs.h>
#include <asm/io.h>
#include "pwm-imx-util.h"
int pwm_init(int pwm_id, int div, int invert)
{
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
if (!pwm)
return -1;
writel(0, &pwm->ir);
return 0;
}
int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles,
unsigned long duty_cycles, unsigned long prescale)
{
u32 cr;
writel(0, &pwm->ir);
cr = PWMCR_PRESCALER(prescale) |
PWMCR_DOZEEN | PWMCR_WAITEN |
PWMCR_DBGEN | PWMCR_CLKSRC_IPG_HIGH;
writel(cr, &pwm->cr);
/* set duty cycles */
writel(duty_cycles, &pwm->sar);
/* set period cycles */
writel(period_cycles, &pwm->pr);
return 0;
}
int pwm_config(int pwm_id, int duty_ns, int period_ns)
{
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
unsigned long period_cycles, duty_cycles, prescale;
if (!pwm)
return -1;
pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
&prescale);
return pwm_config_internal(pwm, period_cycles, duty_cycles, prescale);
}
int pwm_enable(int pwm_id)
{
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
if (!pwm)
return -1;
setbits_le32(&pwm->cr, PWMCR_EN);
return 0;
}
void pwm_disable(int pwm_id)
{
struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id);
if (!pwm)
return;
clrbits_le32(&pwm->cr, PWMCR_EN);
}
#if defined(CONFIG_DM_PWM)
struct imx_pwm_priv {
struct pwm_regs *regs;
bool invert;
};
static int imx_pwm_set_invert(struct udevice *dev, uint channel,
bool polarity)
{
struct imx_pwm_priv *priv = dev_get_priv(dev);
debug("%s: polarity=%u\n", __func__, polarity);
priv->invert = polarity;
return 0;
}
static int imx_pwm_set_config(struct udevice *dev, uint channel,
uint period_ns, uint duty_ns)
{
struct imx_pwm_priv *priv = dev_get_priv(dev);
struct pwm_regs *regs = priv->regs;
unsigned long period_cycles, duty_cycles, prescale;
debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel);
pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles,
&prescale);
return pwm_config_internal(regs, period_cycles, duty_cycles, prescale);
};
static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
{
struct imx_pwm_priv *priv = dev_get_priv(dev);
struct pwm_regs *regs = priv->regs;
debug("%s: Enable '%s' state: %d\n", __func__, dev->name, enable);
if (enable)
setbits_le32(®s->cr, PWMCR_EN);
else
clrbits_le32(®s->cr, PWMCR_EN);
return 0;
};
static int imx_pwm_ofdata_to_platdata(struct udevice *dev)
{
struct imx_pwm_priv *priv = dev_get_priv(dev);
priv->regs = (struct pwm_regs *)devfdt_get_addr(dev);
return 0;
}
static int imx_pwm_probe(struct udevice *dev)
{
return 0;
}
static const struct pwm_ops imx_pwm_ops = {
.set_invert = imx_pwm_set_invert,
.set_config = imx_pwm_set_config,
.set_enable = imx_pwm_set_enable,
};
static const struct udevice_id imx_pwm_ids[] = {
{ .compatible = "fsl,imx27-pwm" },
{ }
};
U_BOOT_DRIVER(imx_pwm) = {
.name = "imx_pwm",
.id = UCLASS_PWM,
.of_match = imx_pwm_ids,
.ops = &imx_pwm_ops,
.ofdata_to_platdata = imx_pwm_ofdata_to_platdata,
.probe = imx_pwm_probe,
.priv_auto_alloc_size = sizeof(struct imx_pwm_priv),
};
#endif