diff options
Diffstat (limited to 'arch/arm/mach-at91/gpio.c')
| -rw-r--r-- | arch/arm/mach-at91/gpio.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c index 9b7495cd555..7b87f3f101b 100644 --- a/arch/arm/mach-at91/gpio.c +++ b/arch/arm/mach-at91/gpio.c @@ -65,6 +65,24 @@ static inline unsigned pin_to_mask(unsigned pin) /* + * mux the pin to the "GPIO" peripheral role. + */ +int __init_or_module at91_set_GPIO_periph(unsigned pin, int use_pullup) +{ + void __iomem *pio = pin_to_controller(pin); + unsigned mask = pin_to_mask(pin); + + if (!pio) + return -EINVAL; + __raw_writel(mask, pio + PIO_IDR); + __raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR)); + __raw_writel(mask, pio + PIO_PER); + return 0; +} +EXPORT_SYMBOL(at91_set_GPIO_periph); + + +/* * mux the pin to the "A" internal peripheral role. */ int __init_or_module at91_set_A_periph(unsigned pin, int use_pullup) @@ -181,6 +199,36 @@ EXPORT_SYMBOL(at91_set_multi_drive); /*--------------------------------------------------------------------------*/ +/* new-style GPIO calls; these expect at91_set_GPIO_periph to have been + * called, and maybe at91_set_multi_drive() for putout pins. + */ + +int gpio_direction_input(unsigned pin) +{ + void __iomem *pio = pin_to_controller(pin); + unsigned mask = pin_to_mask(pin); + + if (!pio || !(__raw_readl(pio + PIO_PSR) & mask)) + return -EINVAL; + __raw_writel(mask, pio + PIO_OER); + return 0; +} +EXPORT_SYMBOL(gpio_direction_input); + +int gpio_direction_output(unsigned pin) +{ + void __iomem *pio = pin_to_controller(pin); + unsigned mask = pin_to_mask(pin); + + if (!pio || !(__raw_readl(pio + PIO_PSR) & mask)) + return -EINVAL; + __raw_writel(mask, pio + PIO_OER); + return 0; +} +EXPORT_SYMBOL(gpio_direction_output); + +/*--------------------------------------------------------------------------*/ + /* * assuming the pin is muxed as a gpio output, set its value. */ |