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gpio: stm32: add ops get_dir_flags

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Add ops get_dir_flags() to read dir flags from GPIO registers.

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 14:30:26 +02:00
parent f13ff88b61
commit 43efbb6a3e
1 changed files with 59 additions and 0 deletions
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59
drivers/gpio/stm32_gpio.c
View file

@ -41,6 +41,11 @@ static void stm32_gpio_set_moder(struct stm32_gpio_regs *regs,
clrsetbits_le32(&regs->moder, mask, mode << bits_index);
}
static int stm32_gpio_get_moder(struct stm32_gpio_regs *regs, int idx)
{
return (readl(&regs->moder) >> MODE_BITS(idx)) & MODE_BITS_MASK;
}
static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_otype otype)
@ -51,6 +56,12 @@ static void stm32_gpio_set_otype(struct stm32_gpio_regs *regs,
clrsetbits_le32(&regs->otyper, OTYPE_MSK << bits, otype << bits);
}
static enum stm32_gpio_otype stm32_gpio_get_otype(struct stm32_gpio_regs *regs,
int idx)
{
return (readl(&regs->otyper) >> OTYPE_BITS(idx)) & OTYPE_MSK;
}
static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
int idx,
enum stm32_gpio_pupd pupd)
@ -61,6 +72,12 @@ static void stm32_gpio_set_pupd(struct stm32_gpio_regs *regs,
clrsetbits_le32(&regs->pupdr, PUPD_MASK << bits, pupd << bits);
}
static enum stm32_gpio_pupd stm32_gpio_get_pupd(struct stm32_gpio_regs *regs,
int idx)
{
return (readl(&regs->pupdr) >> PUPD_BITS(idx)) & PUPD_MASK;
}
/*
* convert gpio offset to gpio index taking into account gpio holes
* into gpio bank
@ -202,6 +219,47 @@ static int stm32_gpio_set_dir_flags(struct udevice *dev, unsigned int offset,
return 0;
}
static int stm32_gpio_get_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;
ulong dir_flags = 0;
idx = stm32_offset_to_index(dev, offset);
if (idx < 0)
return idx;
switch (stm32_gpio_get_moder(regs, idx)) {
case STM32_GPIO_MODE_OUT:
dir_flags |= GPIOD_IS_OUT;
if (stm32_gpio_get_otype(regs, idx) == STM32_GPIO_OTYPE_OD)
dir_flags |= GPIOD_OPEN_DRAIN;
if (readl(&regs->idr) & BIT(idx))
dir_flags |= GPIOD_IS_OUT_ACTIVE;
break;
case STM32_GPIO_MODE_IN:
dir_flags |= GPIOD_IS_IN;
switch (stm32_gpio_get_pupd(regs, idx)) {
case STM32_GPIO_PUPD_UP:
dir_flags |= GPIOD_PULL_UP;
break;
case STM32_GPIO_PUPD_DOWN:
dir_flags |= GPIOD_PULL_DOWN;
break;
default:
break;
}
break;
default:
break;
}
*flags = dir_flags;
return 0;
}
static const struct dm_gpio_ops gpio_stm32_ops = {
.direction_input = stm32_gpio_direction_input,
.direction_output = stm32_gpio_direction_output,
@ -209,6 +267,7 @@ static const struct dm_gpio_ops gpio_stm32_ops = {
.set_value = stm32_gpio_set_value,
.get_function = stm32_gpio_get_function,
.set_dir_flags = stm32_gpio_set_dir_flags,
.get_dir_flags = stm32_gpio_get_dir_flags,
};
static int gpio_stm32_probe(struct udevice *dev)