[U-Boot] [PATCH 5/6] at91: add function to set IO drive
Andreas Bießmann
andreas at biessmann.org
Fri Oct 7 00:11:13 CEST 2016
On 17.08.16 09:13, Heiko Schocher wrote:
> add new function to set I/O drive.
>
> Signed-off-by: Heiko Schocher <hs at denx.de>
> ---
>
> arch/arm/mach-at91/include/mach/at91_pio.h | 5 +++++
> arch/arm/mach-at91/include/mach/gpio.h | 2 ++
> drivers/gpio/at91_gpio.c | 29 +++++++++++++++++++++++++++++
> 3 files changed, 36 insertions(+)
>
> diff --git a/arch/arm/mach-at91/include/mach/at91_pio.h b/arch/arm/mach-at91/include/mach/at91_pio.h
> index 8e054e1..535208a 100644
> --- a/arch/arm/mach-at91/include/mach/at91_pio.h
> +++ b/arch/arm/mach-at91/include/mach/at91_pio.h
> @@ -134,6 +134,7 @@ int at91_set_pio_debounce(unsigned port, unsigned pin, int is_on, int div);
> int at91_set_pio_pulldown(unsigned port, unsigned pin, int is_on);
> int at91_set_pio_disable_schmitt_trig(unsigned port, unsigned pin);
> #endif
> +int at91_set_pio_io_drive(unsigned port, unsigned pin, int value);
> int at91_set_pio_input(unsigned port, unsigned pin, int use_pullup);
> int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on);
> int at91_set_pio_output(unsigned port, unsigned pin, int value);
> @@ -151,4 +152,8 @@ int at91_get_pio_value(unsigned port, unsigned pin);
> #define AT91_PIO_PORTD 0x3
> #define AT91_PIO_PORTE 0x4
>
> +/* allowed I/O driver values */
> +#define AT91_PIO_HI_DRIVE 0
sama5 has 0 + 1 low drive, 2 medium and 3 hi :(
> +#define AT91_PIO_MEDIUM_DRIVE 1
> +#define AT91_PIO_LOW_DRIVE 2
> #endif
> diff --git a/arch/arm/mach-at91/include/mach/gpio.h b/arch/arm/mach-at91/include/mach/gpio.h
> index 6d2a7b7..2b89309 100644
> --- a/arch/arm/mach-at91/include/mach/gpio.h
> +++ b/arch/arm/mach-at91/include/mach/gpio.h
> @@ -227,6 +227,8 @@ static inline unsigned pin_to_mask(unsigned pin)
> at91_set_pio_value((x - PIN_BASE) / 32,(x % 32), y)
> #define at91_get_gpio_value(x) \
> at91_get_pio_value((x - PIN_BASE) / 32,(x % 32))
> +#define at91_set_gpio_io_drive(x, v) \
> + at91_set_pio_io_drive((x - PIN_BASE) / 32,(x % 32), v)
> #else
> #define at91_set_gpio_value(x, y) at91_set_pio_value(x, y)
> #define at91_get_gpio_value(x) at91_get_pio_value(x)
> diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
> index 8e52e3d..1f624f8 100644
> --- a/drivers/gpio/at91_gpio.c
> +++ b/drivers/gpio/at91_gpio.c
> @@ -358,6 +358,35 @@ int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on)
> return 0;
> }
>
> +#if defined(CPU_HAS_PIO3)
> +/*
> + * set I/O driver value
> + */
> +int at91_set_pio_io_drive(unsigned port, unsigned pin, int value)
> +{
> + struct at91_port *at91_port = at91_pio_get_port(port);
> + u32 *reg;
> + u32 mask;
> +
> + if (pin > 15) {
> + reg = &at91_port->io_driver2;
> + pin -= 16;
> + } else {
> + reg = &at91_port->io_driver1;
> + }
> +
> + mask = 0x3 << (pin * 2);
> + clrsetbits_le32(reg, mask, value << (pin * 2));
> + return 0;
> +}
> +#else
> +int at91_set_pio_io_drive(unsigned port, unsigned pin, int value)
> +{
> + return -ENOENT;
> +}
> +#endif
> +
> +
> static void at91_set_port_value(struct at91_port *at91_port, int offset,
> int value)
> {
>
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