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