u-boot/drivers/pwm/pwm-imx.c
Masahiro Yamada 8613c8d897 treewide: convert (void *)devfdt_get_addr() to dev_read_addr_ptr()
Use the _ptr suffixed variant instead of casting. Also, convert it to
dev_read_addr_ptr(), which is safe to CONFIG_OF_LIVE.

One curious part is an error check like follows in
drivers/watchdog/omap_wdt.c:

    priv->regs = (struct wd_timer *)devfdt_get_addr(dev);
    if (!priv->regs)
            return -EINVAL;

devfdt_get_addr() returns FDT_ADDR_T_NONE (i.e. -1) on error.
So, this code does not catch any error in DT parsing.

dev_read_addr_ptr() returns NULL on error, so this error check
will work.

I generated this commit by the following command:

 $ find . -name .git -prune -o -name '*.[ch]' -type f -print | \
   xargs sed -i -e 's/([^*)]*\*)devfdt_get_addr(/dev_read_addr_ptr(/'

I manually fixed drivers/usb/host/ehci-mx6.c

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2020-07-25 14:46:57 -06:00

163 lines
3.4 KiB
C

// 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 <log.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(&regs->cr, PWMCR_EN);
else
clrbits_le32(&regs->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 = dev_read_addr_ptr(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