* add new at91_gpio driver, using c structure SoC access
Signed-off-by: Jens Scharsig js_at_ng@scharsoft.de --- drivers/gpio/at91_gpio.c | 240 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 240 insertions(+), 0 deletions(-) create mode 100644 drivers/gpio/at91_gpio.c
diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c new file mode 100644 index 0000000..5e50ead --- /dev/null +++ b/drivers/gpio/at91_gpio.c @@ -0,0 +1,240 @@ +/* + * Memory Setup stuff - taken from blob memsetup.S + * + * Copyright (C) 2009 Jens Scharsig (js_at_ng@scharsoft.de) + * + * Copyright (C) 2005 HP Labs + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <common.h> +#include <asm/sizes.h> +#include <asm/arch/hardware.h> +#include <asm/arch/io.h> +#include <asm/arch/at91_pio.h> + +#define PIN_BASE 32 + +u32 portpin_to_port(u32 portpin) +{ + return (portpin - PIN_BASE) / 32; +} + +u32 portpin_to_pin(u32 portpin) +{ + return 1 << ((portpin - PIN_BASE) % 32); +} + +/* + * mux the pin to the "GPIO" peripheral role. + */ +int at91_set_gpio_periph(unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + writel(mask, &pio->port[port].idr); + if (use_pullup) + writel(mask, &pio->port[port].puer); + else + writel(mask, &pio->port[port].pudr); + writel(mask, &pio->port[port].per); + + return 0; +} + +/* + * mux the pin to the "A" internal peripheral role. + */ +int at91_set_a_periph(unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + writel(mask, &pio->port[port].idr); + if (use_pullup) + writel(mask, &pio->port[port].puer); + else + writel(mask, &pio->port[port].pudr); + writel(mask, &pio->port[port].asr); + writel(mask, &pio->port[port].pdr); + + return 0; +} + +/* + * mux the pin to the "B" internal peripheral role. + */ +int at91_set_b_periph(unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + writel(mask, &pio->port[port].idr); + if (use_pullup) + writel(mask, &pio->port[port].puer); + else + writel(mask, &pio->port[port].pudr); + writel(mask, &pio->port[port].bsr); + writel(mask, &pio->port[port].pdr); + + return 0; +} + +/* + * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and + * configure it for an input. + */ +int at91_set_gpio_input(u32 pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + writel(mask, &pio->port[port].idr); + if (use_pullup) + writel(mask, &pio->port[port].puer); + else + writel(mask, &pio->port[port].pudr); + writel(mask, &pio->port[port].odr); + writel(mask, &pio->port[port].per); + return 0; +} + +/* + * mux the pin to the gpio controller (instead of "A" or "B" peripheral), + * and configure it for an output. + */ +int at91_set_gpio_output(u32 pin, int value) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + writel(mask, &pio->port[port].idr); + writel(mask, &pio->port[port].pudr); + if (value) + writel(mask, &pio->port[port].sodr); + else + writel(mask, &pio->port[port].codr); + writel(mask, &pio->port[port].oer); + writel(mask, &pio->port[port].per); + + return 0; +} + +/* + * enable/disable the glitch filter; mostly used with IRQ handling. + */ +int at91_set_deglitch(unsigned pin, int is_on) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + if (is_on) + writel(mask, &pio->port[port].ifer); + else + writel(mask, &pio->port[port].ifdr); + return 0; +} + +/* + * enable/disable the multi-driver; This is only valid for output and + * allows the output pin to run as an open collector output. + */ +int at91_set_multi_drive(unsigned pin, int is_on) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + if (is_on) + writel(mask, &pio->port[port].mder); + else + writel(mask, &pio->port[port].mddr); + return 0; +} + +/* +int gpio_direction_input(unsigned pin) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + if (!(readl(&pio->port[port].psr) & mask)) + return -EINVAL; + writel(mask, &pio->port[port].odr); + return 0; +} + +int gpio_direction_output(unsigned pin, int value) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + if (!(readl(&pio->port[port].psr) & mask)) + return -EINVAL; + if (value) + writel(mask, &pio->port[port].sodr); + else + writel(mask, &pio->port[port].codr); + writel(mask, &pio->port[port].oer); + + return 0; +} +*/ +/* + * assuming the pin is muxed as a gpio output, set its value. + */ +int at91_set_gpio_value(unsigned pin, int value) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + + /* printf("%d = Port %d Pin %d (%d)",pin, port, mask, value); */ + if (value) + writel(mask, &pio->port[port].sodr); + else + writel(mask, &pio->port[port].codr); + return 0; +} + +/* + * read the pin's value (works even if it's not muxed as a gpio). + */ +int at91_get_gpio_value(unsigned pin) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 port = portpin_to_port(pin); + u32 mask = portpin_to_pin(pin); + u32 pdsr; + + pdsr = readl(&pio->port[port]); + return (pdsr & mask) != 0; +} +