kona_gpio.c
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/*
* Copyright 2013 Broadcom Corporation.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/sysmap.h>
#define GPIO_BASE (void *)GPIO2_BASE_ADDR
#define GPIO_PASSWD 0x00a5a501
#define GPIO_PER_BANK 32
#define GPIO_MAX_BANK_NUM 8
#define GPIO_BANK(gpio) ((gpio) >> 5)
#define GPIO_BITMASK(gpio) \
(1UL << ((gpio) & (GPIO_PER_BANK - 1)))
#define GPIO_OUT_STATUS(bank) (0x00000000 + ((bank) << 2))
#define GPIO_IN_STATUS(bank) (0x00000020 + ((bank) << 2))
#define GPIO_OUT_SET(bank) (0x00000040 + ((bank) << 2))
#define GPIO_OUT_CLEAR(bank) (0x00000060 + ((bank) << 2))
#define GPIO_INT_STATUS(bank) (0x00000080 + ((bank) << 2))
#define GPIO_INT_MASK(bank) (0x000000a0 + ((bank) << 2))
#define GPIO_INT_MSKCLR(bank) (0x000000c0 + ((bank) << 2))
#define GPIO_CONTROL(bank) (0x00000100 + ((bank) << 2))
#define GPIO_PWD_STATUS(bank) (0x00000500 + ((bank) << 2))
#define GPIO_GPPWR_OFFSET 0x00000520
#define GPIO_GPCTR0_DBR_SHIFT 5
#define GPIO_GPCTR0_DBR_MASK 0x000001e0
#define GPIO_GPCTR0_ITR_SHIFT 3
#define GPIO_GPCTR0_ITR_MASK 0x00000018
#define GPIO_GPCTR0_ITR_CMD_RISING_EDGE 0x00000001
#define GPIO_GPCTR0_ITR_CMD_FALLING_EDGE 0x00000002
#define GPIO_GPCTR0_ITR_CMD_BOTH_EDGE 0x00000003
#define GPIO_GPCTR0_IOTR_MASK 0x00000001
#define GPIO_GPCTR0_IOTR_CMD_0UTPUT 0x00000000
#define GPIO_GPCTR0_IOTR_CMD_INPUT 0x00000001
int gpio_request(unsigned gpio, const char *label)
{
unsigned int value, off;
writel(GPIO_PASSWD, GPIO_BASE + GPIO_GPPWR_OFFSET);
off = GPIO_PWD_STATUS(GPIO_BANK(gpio));
value = readl(GPIO_BASE + off) & ~GPIO_BITMASK(gpio);
writel(value, GPIO_BASE + off);
return 0;
}
int gpio_free(unsigned gpio)
{
unsigned int value, off;
writel(GPIO_PASSWD, GPIO_BASE + GPIO_GPPWR_OFFSET);
off = GPIO_PWD_STATUS(GPIO_BANK(gpio));
value = readl(GPIO_BASE + off) | GPIO_BITMASK(gpio);
writel(value, GPIO_BASE + off);
return 0;
}
int gpio_direction_input(unsigned gpio)
{
u32 val;
val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_IOTR_MASK;
val |= GPIO_GPCTR0_IOTR_CMD_INPUT;
writel(val, GPIO_BASE + GPIO_CONTROL(gpio));
return 0;
}
int gpio_direction_output(unsigned gpio, int value)
{
int bank_id = GPIO_BANK(gpio);
int bitmask = GPIO_BITMASK(gpio);
u32 val, off;
val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
val &= ~GPIO_GPCTR0_IOTR_MASK;
val |= GPIO_GPCTR0_IOTR_CMD_0UTPUT;
writel(val, GPIO_BASE + GPIO_CONTROL(gpio));
off = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
val = readl(GPIO_BASE + off);
val |= bitmask;
writel(val, GPIO_BASE + off);
return 0;
}
int gpio_get_value(unsigned gpio)
{
int bank_id = GPIO_BANK(gpio);
int bitmask = GPIO_BITMASK(gpio);
u32 val, off;
/* determine the GPIO pin direction */
val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
val &= GPIO_GPCTR0_IOTR_MASK;
/* read the GPIO bank status */
off = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ?
GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id);
val = readl(GPIO_BASE + off);
/* return the specified bit status */
return !!(val & bitmask);
}
void gpio_set_value(unsigned gpio, int value)
{
int bank_id = GPIO_BANK(gpio);
int bitmask = GPIO_BITMASK(gpio);
u32 val, off;
/* determine the GPIO pin direction */
val = readl(GPIO_BASE + GPIO_CONTROL(gpio));
val &= GPIO_GPCTR0_IOTR_MASK;
/* this function only applies to output pin */
if (GPIO_GPCTR0_IOTR_CMD_INPUT == val) {
printf("%s: Cannot set an input pin %d\n", __func__, gpio);
return;
}
off = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id);
val = readl(GPIO_BASE + off);
val |= bitmask;
writel(val, GPIO_BASE + off);
}