diff options
| author | Patrice Chotard | 2018-08-09 11:57:57 +0200 |
|---|---|---|
| committer | Tom Rini | 2018-09-10 20:48:18 -0400 |
| commit | 798cd708d5e41fa86b0ff49ee996db9b9833e430 (patch) | |
| tree | 2222d28647f2e02c00723af4d73412afb5673b6a /drivers | |
| parent | c8e570167f8a2eadbd5f3c7a2b38a9e3796cea19 (diff) | |
gpio: stm32f7: replace ODR update by BSRR write
Replace clrsetbits on ODR register (2 operations: one read + one write)
by writing on the correct bit (SET or RESET) of the BSRR register
(only 1 write operation).
Moreover this register if safe for simultaneous access by 2 master on
the bus.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpio/stm32f7_gpio.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/gpio/stm32f7_gpio.c b/drivers/gpio/stm32f7_gpio.c index 5b08e7ee275..4c0786fff88 100644 --- a/drivers/gpio/stm32f7_gpio.c +++ b/drivers/gpio/stm32f7_gpio.c @@ -18,7 +18,7 @@ #define STM32_GPIOS_PER_BANK 16 #define MODE_BITS(gpio_pin) (gpio_pin * 2) #define MODE_BITS_MASK 3 -#define IN_OUT_BIT_INDEX(gpio_pin) (1UL << (gpio_pin)) +#define BSRR_BIT(gpio_pin, value) BIT(gpio_pin + (value ? 0 : 16)) static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset) { @@ -41,8 +41,8 @@ static int stm32_gpio_direction_output(struct udevice *dev, unsigned offset, int mask = MODE_BITS_MASK << bits_index; clrsetbits_le32(®s->moder, mask, STM32_GPIO_MODE_OUT << bits_index); - mask = IN_OUT_BIT_INDEX(offset); - clrsetbits_le32(®s->odr, mask, value ? mask : 0); + + writel(BSRR_BIT(offset, value), ®s->bsrr); return 0; } @@ -52,16 +52,15 @@ static int stm32_gpio_get_value(struct udevice *dev, unsigned offset) struct stm32_gpio_priv *priv = dev_get_priv(dev); struct stm32_gpio_regs *regs = priv->regs; - return readl(®s->idr) & IN_OUT_BIT_INDEX(offset) ? 1 : 0; + return readl(®s->idr) & BIT(offset) ? 1 : 0; } static int stm32_gpio_set_value(struct udevice *dev, unsigned offset, int value) { struct stm32_gpio_priv *priv = dev_get_priv(dev); struct stm32_gpio_regs *regs = priv->regs; - int mask = IN_OUT_BIT_INDEX(offset); - clrsetbits_le32(®s->odr, mask, value ? mask : 0); + writel(BSRR_BIT(offset, value), ®s->bsrr); return 0; } |