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gpio: stm32: add ops set_dir_flags

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Manage flags for GPIO configuration:
- open_drain, open_source, push_pull
- pull_up, pull_down

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-06-04 14:30:25 +02:00
parent 29e4ce3c97
commit f13ff88b61
1 changed files with 76 additions and 14 deletions
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90
drivers/gpio/stm32_gpio.c
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@ -18,9 +18,48 @@
#include <linux/errno.h>
#include <linux/io.h>
#define MODE_BITS(gpio_pin) (gpio_pin * 2)
#define MODE_BITS(gpio_pin) ((gpio_pin) * 2)
#define MODE_BITS_MASK 3
#define BSRR_BIT(gpio_pin, value) BIT(gpio_pin + (value ? 0 : 16))
#define BSRR_BIT(gpio_pin, value) BIT((gpio_pin) + (value ? 0 : 16))
#define PUPD_BITS(gpio_pin) ((gpio_pin) * 2)
#define PUPD_MASK 3
#define OTYPE_BITS(gpio_pin) (gpio_pin)
#define OTYPE_MSK 1
static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
int idx,
int mode)
{
int bits_index;
int mask;
bits_index = MODE_BITS(idx);
mask = MODE_BITS_MASK << bits_index;
clrsetbits_le32(&regs->moder, mask, mode << bits_index);
}
static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_otype otype)
{
int bits;
bits = OTYPE_BITS(idx);
clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
}
static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_pupd pupd)
{
int bits;
bits = PUPD_BITS(idx);
clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
}
/*
* convert gpio offset to gpio index taking into account gpio holes
@ -47,18 +86,13 @@ static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int bits_index;
int mask;
int idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
bits_index = MODE_BITS(idx);
mask = MODE_BITS_MASK << bits_index;
clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_IN << bits_index);
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
return 0;
}
@ -68,18 +102,13 @@ static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset,
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int bits_index;
int mask;
int idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
bits_index = MODE_BITS(idx);
mask = MODE_BITS_MASK << bits_index;
clrsetbits_le32(&regs->moder, mask, STM32_GPIO_MODE_OUT << bits_index);
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
writel(BSRR_BIT(idx, value), &regs->bsrr);
@ -141,12 +170,45 @@ static int stm32_gpio_get_function(struct udevice *dev, unsigned int offset)
return GPIOF_FUNC;
}
static int stm32_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
ulong flags)
{
struct stm32_gpio_priv *priv = dev_get_priv(dev);
struct stm32_gpio_regs *regs = priv->regs;
int idx;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
if (flags & GPIOD_IS_OUT) {
int value = GPIOD_FLAGS_OUTPUT(flags);
if (flags & GPIOD_OPEN_DRAIN)
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_OD);
else
stm32_gpio_set_otype(regs, idx, STM32_GPIO_OTYPE_PP);
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_OUT);
writel(BSRR_BIT(idx, value), &regs->bsrr);
} else if (flags & GPIOD_IS_IN) {
stm32_gpio_set_moder(regs, idx, STM32_GPIO_MODE_IN);
if (flags & GPIOD_PULL_UP)
stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_UP);
else if (flags & GPIOD_PULL_DOWN)
stm32_gpio_set_pupd(regs, idx, STM32_GPIO_PUPD_DOWN);
}
return 0;
}
static const struct dm_gpio_ops gpio_stm32_ops = {
.direction_input = stm32_gpio_direction_input,
.direction_output = stm32_gpio_direction_output,
.get_value = stm32_gpio_get_value,
.set_value = stm32_gpio_set_value,
.get_function = stm32_gpio_get_function,
.set_dir_flags = stm32_gpio_set_dir_flags,
};
static int gpio_stm32_probe(struct udevice *dev)