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kona_gpio.c 3.6 KiB
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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);
    }