u-boot/drivers/gpio/s5p_gpio.c
Przemyslaw Marczak 8475c869c3 s5p: gpio: change gpio coding method for s5p gpio.
Old s5p gpio coding method was not clean and was not working properly
for all parts and banks. New method is clean and easy to extend.

Gpio coding mask:
0x000000ff - pin number
0x00ffff00 - bank offset
0xff000000 - part number

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
2014-02-03 15:36:14 +09:00

181 lines
3.4 KiB
C

/*
* (C) Copyright 2009 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/gpio.h>
#define S5P_GPIO_GET_BANK(x) ((x >> S5P_GPIO_BANK_SHIFT) \
& S5P_GPIO_BANK_MASK)
#define S5P_GPIO_GET_PIN(x) (x & S5P_GPIO_PIN_MASK)
#define CON_MASK(x) (0xf << ((x) << 2))
#define CON_SFR(x, v) ((v) << ((x) << 2))
#define DAT_MASK(x) (0x1 << (x))
#define DAT_SET(x) (0x1 << (x))
#define PULL_MASK(x) (0x3 << ((x) << 1))
#define PULL_MODE(x, v) ((v) << ((x) << 1))
#define DRV_MASK(x) (0x3 << ((x) << 1))
#define DRV_SET(x, m) ((m) << ((x) << 1))
#define RATE_MASK(x) (0x1 << (x + 16))
#define RATE_SET(x) (0x1 << (x + 16))
void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
{
unsigned int value;
value = readl(&bank->con);
value &= ~CON_MASK(gpio);
value |= CON_SFR(gpio, cfg);
writel(value, &bank->con);
}
void s5p_gpio_direction_output(struct s5p_gpio_bank *bank, int gpio, int en)
{
s5p_gpio_cfg_pin(bank, gpio, GPIO_OUTPUT);
s5p_gpio_set_value(bank, gpio, en);
}
void s5p_gpio_direction_input(struct s5p_gpio_bank *bank, int gpio)
{
s5p_gpio_cfg_pin(bank, gpio, GPIO_INPUT);
}
void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
{
unsigned int value;
value = readl(&bank->dat);
value &= ~DAT_MASK(gpio);
if (en)
value |= DAT_SET(gpio);
writel(value, &bank->dat);
}
unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
{
unsigned int value;
value = readl(&bank->dat);
return !!(value & DAT_MASK(gpio));
}
void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->pull);
value &= ~PULL_MASK(gpio);
switch (mode) {
case GPIO_PULL_DOWN:
case GPIO_PULL_UP:
value |= PULL_MODE(gpio, mode);
break;
default:
break;
}
writel(value, &bank->pull);
}
void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->drv);
value &= ~DRV_MASK(gpio);
switch (mode) {
case GPIO_DRV_1X:
case GPIO_DRV_2X:
case GPIO_DRV_3X:
case GPIO_DRV_4X:
value |= DRV_SET(gpio, mode);
break;
default:
return;
}
writel(value, &bank->drv);
}
void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->drv);
value &= ~RATE_MASK(gpio);
switch (mode) {
case GPIO_DRV_FAST:
case GPIO_DRV_SLOW:
value |= RATE_SET(gpio);
break;
default:
return;
}
writel(value, &bank->drv);
}
struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned gpio)
{
unsigned bank = S5P_GPIO_GET_BANK(gpio);
unsigned base = s5p_gpio_base(gpio);
return (struct s5p_gpio_bank *)(base + bank);
}
int s5p_gpio_get_pin(unsigned gpio)
{
return S5P_GPIO_GET_PIN(gpio);
}
/* Common GPIO API */
int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
s5p_gpio_direction_input(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio));
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
s5p_gpio_direction_output(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), value);
return 0;
}
int gpio_get_value(unsigned gpio)
{
return (int) s5p_gpio_get_value(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio));
}
int gpio_set_value(unsigned gpio, int value)
{
s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), value);
return 0;
}