u-boot/board/st-ericsson/u8500/gpio.c
John Rigby afbf88993c armv7: Add support for ST-Ericsson U8500 href platform
Minimal platform support to boot linux from SD.

Supported devices/hw limited to external MMC/SD slot,
GPIO, I2C and minimal PRCMU.

Signed-off-by: John Rigby <john.rigby@linaro.org>
CC: Albert Aribaud <albert.aribaud@free.fr>
2011-06-01 19:31:03 +02:00

348 lines
7.5 KiB
C

/*
* Copyright (C) ST-Ericsson SA 2009
*
* 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 <common.h>
#include <asm/arch/gpio.h>
static struct gpio_register *addr_gpio_register[] = {
(void *)U8500_GPIO_0_BASE,
(void *)U8500_GPIO_1_BASE,
(void *)U8500_GPIO_2_BASE,
(void *)U8500_GPIO_3_BASE,
(void *)U8500_GPIO_4_BASE,
(void *)U8500_GPIO_5_BASE,
(void *)U8500_GPIO_6_BASE,
(void *)U8500_GPIO_7_BASE,
(void *)U8500_GPIO_8_BASE,
};
struct gpio_altfun_data altfun_table[] = {
{
.altfun = GPIO_ALT_I2C_0,
.start = 147,
.end = 148,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_I2C_1,
.start = 16,
.end = 17,
.cont = 0,
.type = GPIO_ALTF_B,
},
{
.altfun = GPIO_ALT_I2C_2,
.start = 10,
.end = 11,
.cont = 0,
.type = GPIO_ALTF_B,
},
{
.altfun = GPIO_ALT_I2C_3,
.start = 229,
.end = 230,
.cont = 0,
.type = GPIO_ALTF_C,
},
{
.altfun = GPIO_ALT_UART_0_MODEM,
.start = 0,
.end = 3,
.cont = 1,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_UART_0_MODEM,
.start = 33,
.end = 36,
.cont = 0,
.type = GPIO_ALTF_C,
},
{
.altfun = GPIO_ALT_UART_1,
.start = 4,
.end = 7,
.cont = 0,
.type =
GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_UART_2,
.start = 18,
.end = 19,
.cont = 1,
.type = GPIO_ALTF_B,
},
{
.altfun = GPIO_ALT_UART_2,
.start = 29,
.end = 32,
.cont = 0,
.type = GPIO_ALTF_C,
},
{
.altfun = GPIO_ALT_MSP_0,
.start = 12,
.end = 17,
.cont = 1,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_MSP_0,
.start = 21,
.end = 21,
.cont = 0,
.type = GPIO_ALTF_B,
},
{
.altfun = GPIO_ALT_MSP_1,
.start = 33,
.end = 36,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_MSP_2,
.start = 192,
.end = 196,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_LCD_PANEL,
.start = 64,
.end = 93,
.cont = 1,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_LCD_PANEL,
.start = 150,
.end = 171,
.cont = 0,
.type = GPIO_ALTF_B,
},
{
.altfun = GPIO_ALT_SD_CARD0,
.start = 18,
.end = 28,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_MM_CARD0,
.start = 18,
.end = 32,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_USB_OTG,
.start = 256,
.end = 267,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_EMMC,
.start = 197,
.end = 207,
.cont = 0,
.type = GPIO_ALTF_A,
},
{
.altfun = GPIO_ALT_POP_EMMC,
.start = 128,
.end = 138,
.cont = 0,
.type = GPIO_ALTF_A,
},
};
/*
* Static Function declarations
*/
enum gpio_error gpio_setpinconfig(int pin_id, struct gpio_config *config)
{
struct gpio_register *p_gpio_register =
addr_gpio_register[GPIO_BLOCK(pin_id)];
u32 mask = 1UL << (pin_id % GPIO_PINS_PER_BLOCK);
enum gpio_error error = GPIO_OK;
u32 temp_reg;
switch (config->mode) {
case GPIO_ALTF_A:
temp_reg = readl(&p_gpio_register->gpio_afsa);
temp_reg |= mask;
writel(temp_reg, &p_gpio_register->gpio_afsa);
temp_reg = readl(&p_gpio_register->gpio_afsb);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsb);
break;
case GPIO_ALTF_B:
temp_reg = readl(&p_gpio_register->gpio_afsa);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsa);
temp_reg = readl(&p_gpio_register->gpio_afsb);
temp_reg |= mask;
writel(temp_reg, &p_gpio_register->gpio_afsb);
break;
case GPIO_ALTF_C:
temp_reg = readl(&p_gpio_register->gpio_afsa);
temp_reg |= mask;
writel(temp_reg, &p_gpio_register->gpio_afsa);
temp_reg = readl(&p_gpio_register->gpio_afsb);
temp_reg |= mask;
writel(temp_reg, &p_gpio_register->gpio_afsb);
break;
case GPIO_MODE_SOFTWARE:
temp_reg = readl(&p_gpio_register->gpio_afsa);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsa);
temp_reg = readl(&p_gpio_register->gpio_afsb);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsb);
switch (config->direction) {
case GPIO_DIR_INPUT:
writel(mask, &p_gpio_register->gpio_dirc);
break;
case GPIO_DIR_OUTPUT:
writel(mask, &p_gpio_register->gpio_dirs);
break;
case GPIO_DIR_LEAVE_UNCHANGED:
break;
default:
return GPIO_INVALID_PARAMETER;
}
break;
case GPIO_MODE_LEAVE_UNCHANGED:
break;
default:
return GPIO_INVALID_PARAMETER;
}
return error;
}
enum gpio_error gpio_resetgpiopin(int pin_id, char *dev_name)
{
struct gpio_register *p_gpio_register =
addr_gpio_register[GPIO_BLOCK(pin_id)];
u32 mask = 1UL << (pin_id % GPIO_PINS_PER_BLOCK);
enum gpio_error error = GPIO_OK;
u32 temp_reg;
temp_reg = readl(&p_gpio_register->gpio_afsa);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsa);
temp_reg = readl(&p_gpio_register->gpio_afsb);
temp_reg &= ~mask;
writel(temp_reg, &p_gpio_register->gpio_afsb);
writel(mask, &p_gpio_register->gpio_dirc);
return error;
}
struct gpio_config altfun_pinconfig;
enum gpio_error gpio_altfunction(enum gpio_alt_function alt_func,
int which_altfunc, char *dev_name)
{
int i, j, start, end;
enum gpio_error error = -1;
for (i = 0; i < ARRAY_SIZE(altfun_table); i++) {
if (altfun_table[i].altfun != alt_func)
continue;
start = altfun_table[i].start;
end = altfun_table[i].end;
for (j = start; j <= end; j++) {
if (which_altfunc == GPIO_ALTF_FIND)
altfun_pinconfig.mode = altfun_table[i].type;
else
altfun_pinconfig.mode = which_altfunc;
altfun_pinconfig.direction = GPIO_DIR_OUTPUT;
altfun_pinconfig.dev_name = dev_name;
if (which_altfunc != GPIO_ALTF_DISABLE)
error = gpio_setpinconfig(j, &altfun_pinconfig);
else
error = gpio_resetgpiopin(j, dev_name);
if (!error)
continue;
printf("GPIO %d configuration failure (nmdk_error:%d)",
j, error);
error = GPIO_INVALID_PARAMETER;
return error;
}
if (!altfun_table[i].cont)
break;
}
return error;
}
int gpio_writepin(int pin_id, enum gpio_data value, char *dev_name)
{
struct gpio_register *p_gpio_register =
addr_gpio_register[GPIO_BLOCK(pin_id)];
u32 mask = 1UL << (pin_id % GPIO_PINS_PER_BLOCK);
switch (value) {
case GPIO_DATA_HIGH:
writel(mask, &p_gpio_register->gpio_dats);
break;
case GPIO_DATA_LOW:
writel(mask, &p_gpio_register->gpio_datc);
break;
default:
printf("Invalid value passed in %s", __FUNCTION__);
return GPIO_INVALID_PARAMETER;
}
return GPIO_OK;
}
int gpio_readpin(int pin_id, enum gpio_data *rv)
{
struct gpio_register *p_gpio_register =
addr_gpio_register[GPIO_BLOCK(pin_id)];
u32 mask = 1UL << (pin_id % GPIO_PINS_PER_BLOCK);
if ((readl(&p_gpio_register->gpio_dat) & mask) != 0)
*rv = GPIO_DATA_HIGH;
else
*rv = GPIO_DATA_LOW;
return GPIO_OK;
}
int gpio_altfuncenable(enum gpio_alt_function altfunc, char *dev_name)
{
return (int)gpio_altfunction(altfunc, GPIO_ALTF_FIND, dev_name);
}
int gpio_altfuncdisable(enum gpio_alt_function altfunc, char *dev_name)
{
return (int)gpio_altfunction(altfunc, GPIO_ALTF_DISABLE, dev_name);
}