u-boot/drivers/gpio/da8xx_gpio.c
Laurence Withers f517afd5df DA8xx: add generic GPIO driver
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>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
2011-08-03 12:49:19 +02:00

281 lines
6.1 KiB
C

/*
* 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);
}
}