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author | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
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committer | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
commit | 92988a21ad4c4c9504295ccb580c9f806134471b (patch) | |
tree | 5effc9f14170112450de05c67dafbe8d5034d595 /u-boot/drivers/gpio/at91_gpio.c | |
parent | ca2b506783b676c95762c54ea24dcfdaae1947c9 (diff) | |
download | bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.zip bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.gz bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.bz2 |
added boot script files to repository
Diffstat (limited to 'u-boot/drivers/gpio/at91_gpio.c')
-rw-r--r-- | u-boot/drivers/gpio/at91_gpio.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/u-boot/drivers/gpio/at91_gpio.c b/u-boot/drivers/gpio/at91_gpio.c new file mode 100644 index 0000000..c0a97bc --- /dev/null +++ b/u-boot/drivers/gpio/at91_gpio.c @@ -0,0 +1,214 @@ +/* + * 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> + +int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + if (use_pullup) + writel(1 << pin, &pio->port[port].puer); + else + writel(1 << pin, &pio->port[port].pudr); + writel(mask, &pio->port[port].per); + } + return 0; +} + +/* + * mux the pin to the "GPIO" peripheral role. + */ +int at91_set_pio_periph(unsigned port, unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + writel(mask, &pio->port[port].idr); + at91_set_pio_pullup(port, pin, use_pullup); + writel(mask, &pio->port[port].per); + } + return 0; +} + +/* + * mux the pin to the "A" internal peripheral role. + */ +int at91_set_a_periph(unsigned port, unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + writel(mask, &pio->port[port].idr); + at91_set_pio_pullup(port, pin, use_pullup); + 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 port, unsigned pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + writel(mask, &pio->port[port].idr); + at91_set_pio_pullup(port, pin, use_pullup); + 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_pio_input(unsigned port, u32 pin, int use_pullup) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + writel(mask, &pio->port[port].idr); + at91_set_pio_pullup(port, pin, use_pullup); + 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_pio_output(unsigned port, u32 pin, int value) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << 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_pio_deglitch(unsigned port, unsigned pin, int is_on) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << 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_pio_multi_drive(unsigned port, unsigned pin, int is_on) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + if (is_on) + writel(mask, &pio->port[port].mder); + else + writel(mask, &pio->port[port].mddr); + } + return 0; +} + +/* + * assuming the pin is muxed as a gpio output, set its value. + */ +int at91_set_pio_value(unsigned port, unsigned pin, int value) +{ + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + 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_pio_value(unsigned port, unsigned pin) +{ + u32 pdsr = 0; + at91_pio_t *pio = (at91_pio_t *) AT91_PIO_BASE; + u32 mask; + + if ((port < AT91_PIO_PORTS) && (pin < 32)) { + mask = 1 << pin; + pdsr = readl(&pio->port[port].pdsr) & mask; + } + return pdsr != 0; +} |