Add a generic GPIO driver for the DaVinci DA8xx processors. It is turned on by defining CONFIG_DA8XX_GPIO and fulfills the generic GPIO interface specified in <asm/gpio.h> . The driver has support for both manipulating GPIO pins as well as automatically configuring the pin multiplexor registers to set the pin function to GPIO.
Signed-off-by: Laurence Withers lwithers@guralp.com --- arch/arm/include/asm/arch-davinci/gpio.h | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/da8xx_gpio.c | 281 ++++++++++++++++++++++++++++++ 3 files changed, 290 insertions(+), 0 deletions(-) create mode 100644 drivers/gpio/da8xx_gpio.c
diff --git a/arch/arm/include/asm/arch-davinci/gpio.h b/arch/arm/include/asm/arch-davinci/gpio.h index 1be2ac2..29dcccf 100644 --- a/arch/arm/include/asm/arch-davinci/gpio.h +++ b/arch/arm/include/asm/arch-davinci/gpio.h @@ -63,4 +63,12 @@ struct davinci_gpio_bank { #define davinci_gpio_bank45 ((struct davinci_gpio *)DAVINCI_GPIO_BANK45) #define davinci_gpio_bank67 ((struct davinci_gpio *)DAVINCI_GPIO_BANK67)
+#define gpio_status() gpio_info() +#define GPIO_NAME_SIZE 20 +#define MAX_NUM_GPIOS 144 +#define GPIO_BANK(gp) (davinci_gpio_bank01 + ((gp) >> 5)) +#define GPIO_BIT(gp) ((gp) & 0x1F) + +void gpio_info(void); + #endif diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 1e3ae11..62ec97d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -32,6 +32,7 @@ COBJS-$(CONFIG_MXC_GPIO) += mxc_gpio.o COBJS-$(CONFIG_PCA953X) += pca953x.o COBJS-$(CONFIG_S5P) += s5p_gpio.o COBJS-$(CONFIG_TEGRA2_GPIO) += tegra2_gpio.o +COBJS-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/gpio/da8xx_gpio.c b/drivers/gpio/da8xx_gpio.c new file mode 100644 index 0000000..0308223 --- /dev/null +++ b/drivers/gpio/da8xx_gpio.c @@ -0,0 +1,281 @@ +/* + * GPIO driver for TI DaVinci DA8xx SOCs. + * + * (C) Copyright 2011 Guralp Systems Ltd. + * Laurence Withers lwithers@guralp.com + * + * 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 <asm/io.h> +#include <asm/gpio.h> +#include <asm/arch/gpio.h> +#include <asm/arch/hardware.h> +#include <asm/arch/davinci_misc.h> + + +static struct gpio_registry { + int is_registered; + char name[GPIO_NAME_SIZE]; +} gpio_registry[MAX_NUM_GPIOS]; + + +#define pinmux(x) (&davinci_syscfg_regs->pinmux[x]) + +static const struct pinmux_config gpio_pinmux[] = { + { pinmux(1), 8, 7 }, /* GP0[0] */ + { pinmux(1), 8, 6 }, + { pinmux(1), 8, 5 }, + { pinmux(1), 8, 4 }, + { pinmux(1), 8, 3 }, + { pinmux(1), 8, 2 }, + { pinmux(1), 8, 1 }, + { pinmux(1), 8, 0 }, + { pinmux(0), 8, 7 }, + { pinmux(0), 8, 6 }, + { pinmux(0), 8, 5 }, + { pinmux(0), 8, 4 }, + { pinmux(0), 8, 3 }, + { pinmux(0), 8, 2 }, + { pinmux(0), 8, 1 }, + { pinmux(0), 8, 0 }, + { pinmux(4), 8, 7 }, /* GP1[0] */ + { pinmux(4), 8, 6 }, + { pinmux(4), 8, 5 }, + { pinmux(4), 8, 4 }, + { pinmux(4), 8, 3 }, + { pinmux(4), 8, 2 }, + { pinmux(4), 4, 1 }, + { pinmux(4), 4, 0 }, + { pinmux(3), 4, 0 }, + { pinmux(2), 4, 6 }, + { pinmux(2), 4, 5 }, + { pinmux(2), 4, 4 }, + { pinmux(2), 4, 3 }, + { pinmux(2), 4, 2 }, + { pinmux(2), 4, 1 }, + { pinmux(2), 8, 0 }, + { pinmux(6), 8, 7 }, /* GP2[0] */ + { pinmux(6), 8, 6 }, + { pinmux(6), 8, 5 }, + { pinmux(6), 8, 4 }, + { pinmux(6), 8, 3 }, + { pinmux(6), 8, 2 }, + { pinmux(6), 8, 1 }, + { pinmux(6), 8, 0 }, + { pinmux(5), 8, 7 }, + { pinmux(5), 8, 6 }, + { pinmux(5), 8, 5 }, + { pinmux(5), 8, 4 }, + { pinmux(5), 8, 3 }, + { pinmux(5), 8, 2 }, + { pinmux(5), 8, 1 }, + { pinmux(5), 8, 0 }, + { pinmux(8), 8, 7 }, /* GP3[0] */ + { pinmux(8), 8, 6 }, + { pinmux(8), 8, 5 }, + { pinmux(8), 8, 4 }, + { pinmux(8), 8, 3 }, + { pinmux(8), 8, 2 }, + { pinmux(8), 8, 1 }, + { pinmux(8), 8, 0 }, + { pinmux(7), 8, 7 }, + { pinmux(7), 8, 6 }, + { pinmux(7), 8, 5 }, + { pinmux(7), 8, 4 }, + { pinmux(7), 8, 3 }, + { pinmux(7), 8, 2 }, + { pinmux(7), 8, 1 }, + { pinmux(7), 8, 0 }, + { pinmux(10), 8, 7 }, /* GP4[0] */ + { pinmux(10), 8, 6 }, + { pinmux(10), 8, 5 }, + { pinmux(10), 8, 4 }, + { pinmux(10), 8, 3 }, + { pinmux(10), 8, 2 }, + { pinmux(10), 8, 1 }, + { pinmux(10), 8, 0 }, + { pinmux(9), 8, 7 }, + { pinmux(9), 8, 6 }, + { pinmux(9), 8, 5 }, + { pinmux(9), 8, 4 }, + { pinmux(9), 8, 3 }, + { pinmux(9), 8, 2 }, + { pinmux(9), 8, 1 }, + { pinmux(9), 8, 0 }, + { pinmux(12), 8, 7 }, /* GP5[0] */ + { pinmux(12), 8, 6 }, + { pinmux(12), 8, 5 }, + { pinmux(12), 8, 4 }, + { pinmux(12), 8, 3 }, + { pinmux(12), 8, 2 }, + { pinmux(12), 8, 1 }, + { pinmux(12), 8, 0 }, + { pinmux(11), 8, 7 }, + { pinmux(11), 8, 6 }, + { pinmux(11), 8, 5 }, + { pinmux(11), 8, 4 }, + { pinmux(11), 8, 3 }, + { pinmux(11), 8, 2 }, + { pinmux(11), 8, 1 }, + { pinmux(11), 8, 0 }, + { pinmux(19), 8, 6 }, /* GP6[0] */ + { pinmux(19), 8, 5 }, + { pinmux(19), 8, 4 }, + { pinmux(19), 8, 3 }, + { pinmux(19), 8, 2 }, + { pinmux(16), 8, 1 }, + { pinmux(14), 8, 1 }, + { pinmux(14), 8, 0 }, + { pinmux(13), 8, 7 }, + { pinmux(13), 8, 6 }, + { pinmux(13), 8, 5 }, + { pinmux(13), 8, 4 }, + { pinmux(13), 8, 3 }, + { pinmux(13), 8, 2 }, + { pinmux(13), 8, 1 }, + { pinmux(13), 8, 0 }, + { pinmux(18), 8, 1 }, /* GP7[0] */ + { pinmux(18), 8, 0 }, + { pinmux(17), 8, 7 }, + { pinmux(17), 8, 6 }, + { pinmux(17), 8, 5 }, + { pinmux(17), 8, 4 }, + { pinmux(17), 8, 3 }, + { pinmux(17), 8, 2 }, + { pinmux(17), 8, 1 }, + { pinmux(17), 8, 0 }, + { pinmux(16), 8, 7 }, + { pinmux(16), 8, 6 }, + { pinmux(16), 8, 5 }, + { pinmux(16), 8, 4 }, + { pinmux(16), 8, 3 }, + { pinmux(16), 8, 2 }, + { pinmux(19), 8, 0 }, /* GP8[0] */ + { pinmux(3), 4, 7 }, + { pinmux(3), 4, 6 }, + { pinmux(3), 4, 5 }, + { pinmux(3), 4, 4 }, + { pinmux(3), 4, 3 }, + { pinmux(3), 4, 2 }, + { pinmux(2), 4, 7 }, + { pinmux(19), 8, 1 }, + { pinmux(19), 8, 0 }, + { pinmux(18), 8, 7 }, + { pinmux(18), 8, 6 }, + { pinmux(18), 8, 5 }, + { pinmux(18), 8, 4 }, + { pinmux(18), 8, 3 }, + { pinmux(18), 8, 2 }, +}; + + + +int gpio_request(int gp, const char *label) +{ + if (gp >= MAX_NUM_GPIOS) + return -1; + + if (gpio_registry[gp].is_registered) + return -1; + + gpio_registry[gp].is_registered = 1; + strncpy(gpio_registry[gp].name, label, GPIO_NAME_SIZE); + gpio_registry[gp].name[GPIO_NAME_SIZE - 1] = 0; + + davinci_configure_pin_mux(&gpio_pinmux[gp], 1); + + return 0; +} + + +void gpio_free(int gp) +{ + gpio_registry[gp].is_registered = 0; +} + + +void gpio_toggle_value(int gp) +{ + struct davinci_gpio *bank; + + bank = GPIO_BANK(gp); + gpio_set_value(gp, !gpio_get_value(gp)); +} + + +int gpio_direction_input(int gp) +{ + struct davinci_gpio *bank; + + bank = GPIO_BANK(gp); + setbits_le32(&bank->dir, 1U << GPIO_BIT(gp)); + return 0; +} + + +int gpio_direction_output(int gp, int value) +{ + struct davinci_gpio *bank; + + bank = GPIO_BANK(gp); + clrbits_le32(&bank->dir, 1U << GPIO_BIT(gp)); + gpio_set_value(gp, value); + return 0; +} + + +int gpio_get_value(int gp) +{ + struct davinci_gpio *bank; + unsigned int ip; + + bank = GPIO_BANK(gp); + ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gp)); + return ip ? 1 : 0; +} + + +void gpio_set_value(int gp, int value) +{ + struct davinci_gpio *bank; + + bank = GPIO_BANK(gp); + + if (value) + bank->set_data = 1U << GPIO_BIT(gp); + else + bank->clr_data = 1U << GPIO_BIT(gp); +} + + +void gpio_info(void) +{ + int gp, dir, val; + struct davinci_gpio *bank; + + for (gp = 0; gp < MAX_NUM_GPIOS; ++gp) { + bank = GPIO_BANK(gp); + dir = in_le32(&bank->dir) & (1U << GPIO_BIT(gp)); + val = gpio_get_value(gp); + + printf("% 4d: %s: %d [%c] %s\n", + gp, dir ? " in" : "out", val, + gpio_registry[gp].is_registered ? 'x' : ' ', + gpio_registry[gp].name); + } +}