]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/gpio/s3c2440_gpio.c
3 * Gabriel Huau <contact@huau-gabriel.fr>
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/s3c2440.h>
13 #define GPIO_INPUT 0x0
14 #define GPIO_OUTPUT 0x1
16 #define S3C_GPIO_CON 0x0
17 #define S3C_GPIO_DAT 0x4
19 static uint32_t s3c_gpio_get_bank_addr(unsigned gpio
)
21 /* There is up to 16 pins per bank, one bank is 0x10 big. */
22 uint32_t addr
= gpio
& ~0xf;
24 if (addr
>= 0x80 && addr
!= 0xd0) { /* Wrong GPIO bank. */
25 printf("Invalid GPIO bank (bank %02x)\n", addr
);
29 return addr
| S3C24X0_GPIO_BASE
;
32 int gpio_set_value(unsigned gpio
, int value
)
34 uint32_t addr
= s3c_gpio_get_bank_addr(gpio
);
36 if (addr
== 0xffffffff)
40 setbits_le32(addr
| S3C_GPIO_DAT
, 1 << (gpio
& 0xf));
42 clrbits_le32(addr
| S3C_GPIO_DAT
, 1 << (gpio
& 0xf));
47 int gpio_get_value(unsigned gpio
)
49 uint32_t addr
= s3c_gpio_get_bank_addr(gpio
);
51 if (addr
== 0xffffffff)
54 return !!(readl(addr
| S3C_GPIO_DAT
) & (1 << (gpio
& 0xf)));
57 int gpio_request(unsigned gpio
, const char *label
)
62 int gpio_free(unsigned gpio
)
67 static int s3c_gpio_direction(unsigned gpio
, uint8_t dir
)
69 uint32_t addr
= s3c_gpio_get_bank_addr(gpio
);
70 const uint32_t mask
= 0x3 << ((gpio
& 0xf) << 1);
71 const uint32_t dirm
= dir
<< ((gpio
& 0xf) << 1);
73 if (addr
== 0xffffffff)
76 clrsetbits_le32(addr
| S3C_GPIO_CON
, mask
, dirm
);
80 int gpio_direction_input(unsigned gpio
)
82 return s3c_gpio_direction(gpio
, GPIO_INPUT
);
85 int gpio_direction_output(unsigned gpio
, int value
)
87 return s3c_gpio_direction(gpio
, GPIO_OUTPUT
);