diff options
author | Matthias Kaehlcke <matthias@kaehlcke.net> | 2010-01-12 20:30:47 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-01-14 10:04:13 +0100 |
commit | 80bbe0c66e5a36054738c4331f13ba7a5694a448 (patch) | |
tree | a70bbfdd151e63316c9bea3d15f3b6e2500ee7f9 /arch | |
parent | 6f4ed9536d2806e93f402eaf83755ffed542ca30 (diff) | |
download | barebox-80bbe0c66e5a36054738c4331f13ba7a5694a448.tar.gz barebox-80bbe0c66e5a36054738c4331f13ba7a5694a448.tar.xz |
Add support for EP9xx GPIOs
Added generic GPIO support for EP93xx SoCs
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/Kconfig | 1 | ||||
-rw-r--r-- | arch/arm/mach-ep93xx/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/mach-ep93xx/gpio.c | 136 | ||||
-rw-r--r-- | arch/arm/mach-ep93xx/include/mach/gpio.h | 29 |
4 files changed, 167 insertions, 1 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 414a013bf4..9cad224cec 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -34,6 +34,7 @@ config ARCH_AT91RM9200 config ARCH_EP93XX bool "Cirrus Logic EP93xx" select CPU_ARM920T + select GENERIC_GPIO config ARCH_IMX bool "Freescale iMX-based" diff --git a/arch/arm/mach-ep93xx/Makefile b/arch/arm/mach-ep93xx/Makefile index d5786db2b9..dac657178a 100644 --- a/arch/arm/mach-ep93xx/Makefile +++ b/arch/arm/mach-ep93xx/Makefile @@ -1,3 +1,3 @@ -obj-y += clocksource.o led.o +obj-y += clocksource.o gpio.o led.o obj-$(CONFIG_MACH_DO_LOWLEVEL_INIT) += lowlevel_init.o diff --git a/arch/arm/mach-ep93xx/gpio.c b/arch/arm/mach-ep93xx/gpio.c new file mode 100644 index 0000000000..5d57434031 --- /dev/null +++ b/arch/arm/mach-ep93xx/gpio.c @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net> + * + * 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 <common.h> +#include <errno.h> +#include <init.h> +#include <asm/io.h> +#include <mach/ep93xx-regs.h> + +#define EP93XX_GPIO_NUM_PORTS 8 +#define EP93XX_GPIO_NUM_GPIOS (EP93XX_GPIO_NUM_PORTS * 8) + +struct gpio_port { + uint32_t *dr; + uint32_t *ddr; +}; + +struct gpio_port gpio_ports[EP93XX_GPIO_NUM_PORTS]; + +static int ep93xx_gpio_init(void) +{ + struct gpio_regs *gpio_regs = (struct gpio_regs *)GPIO_BASE; + + gpio_ports[0].dr = &gpio_regs->padr; + gpio_ports[0].ddr = &gpio_regs->paddr; + gpio_ports[1].dr = &gpio_regs->pbdr; + gpio_ports[1].ddr = &gpio_regs->pbddr; + gpio_ports[2].dr = &gpio_regs->pcdr; + gpio_ports[2].ddr = &gpio_regs->pcddr; + gpio_ports[3].dr = &gpio_regs->pddr; + gpio_ports[3].ddr = &gpio_regs->pdddr; + gpio_ports[4].dr = &gpio_regs->pedr; + gpio_ports[4].ddr = &gpio_regs->peddr; + gpio_ports[5].dr = &gpio_regs->pfdr; + gpio_ports[5].ddr = &gpio_regs->pfddr; + gpio_ports[6].dr = &gpio_regs->pgdr; + gpio_ports[6].ddr = &gpio_regs->pgddr; + gpio_ports[7].dr = &gpio_regs->phdr; + gpio_ports[7].ddr = &gpio_regs->phddr; + + return 0; +} + +postcore_initcall(ep93xx_gpio_init); + +static struct gpio_port *gpio_get_port(unsigned gpio) +{ + if (gpio >= EP93XX_GPIO_NUM_GPIOS) + return 0; + + return &gpio_ports[gpio / 8]; +} + +void gpio_set_value(unsigned gpio, int value) +{ + struct gpio_port *port = gpio_get_port(gpio); + const int shift = gpio % 8; + u32 val; + + if (!port) + return; + + val = readl(port->dr); + + if (value) + val |= 1 << shift; + else + val &= ~(1 << shift); + + writel(val, port->dr); +} + +int gpio_direction_input(unsigned gpio) +{ + struct gpio_port *port = gpio_get_port(gpio); + const int shift = gpio % 8; + u32 val; + + if (!port) + return -EINVAL; + + val = readl(port->ddr); + val &= ~(1 << shift); + writel(val, port->ddr); + + return 0; +} + +int gpio_direction_output(unsigned gpio, int value) +{ + struct gpio_port *port = gpio_get_port(gpio); + const int shift = gpio % 8; + u32 val; + + if (!port) + return -EINVAL; + + gpio_set_value(gpio, value); + + val = readl(port->ddr); + val |= 1 << shift; + writel(val, port->ddr); + + return 0; +} + +int gpio_get_value(unsigned gpio) +{ + struct gpio_port *port = gpio_get_port(gpio); + const int shift = gpio % 8; + u32 val; + + if (!port) + return -EINVAL; + + val = readl(port->dr); + + return val & (1 << shift) ? 1 : 0; +} + diff --git a/arch/arm/mach-ep93xx/include/mach/gpio.h b/arch/arm/mach-ep93xx/include/mach/gpio.h new file mode 100644 index 0000000000..a305f274c4 --- /dev/null +++ b/arch/arm/mach-ep93xx/include/mach/gpio.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2010 Matthias Kaehlcke <matthias@kaehlcke.net> + * + * 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 + * + */ + +#ifndef __ASM_ARCH_GPIO_H +#define __ASM_ARCH_GPIO_H + +void gpio_set_value(unsigned gpio, int value); +int gpio_get_value(unsigned gpio); +int gpio_direction_output(unsigned gpio, int value); +int gpio_direction_input(unsigned gpio); + +#endif /* __ASM_ARCH_GPIO_H */ + |