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drivers/gpio/kona_gpio.c
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24e521975 gpio: kona: Add K... |
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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 ", __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); } |