forked from Mirrors/opensbi
bef8f9b806
FDT gpio drivers have an extra .xlate operation, so they need to embed the `struct fdt_driver` inside the subsystem-specific type. The gpio subsystem always initializes the driver for a specific DT node. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Starfive
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*
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* Authors:
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* Minda.chen <Minda.chen@starfivetech.com>
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*/
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_heap.h>
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#include <sbi/sbi_console.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/gpio/fdt_gpio.h>
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#define STARFIVE_GPIO_PINS_DEF 64
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#define STARFIVE_GPIO_OUTVAL 0x40
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#define STARFIVE_GPIO_MASK 0xff
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#define STARFIVE_GPIO_REG_SHIFT_MASK 0x3
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#define STARFIVE_GPIO_SHIFT_BITS 0x3
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struct starfive_gpio_chip {
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unsigned long addr;
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struct gpio_chip chip;
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};
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static int starfive_gpio_direction_output(struct gpio_pin *gp, int value)
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{
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u32 val;
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unsigned long reg_addr;
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u32 bit_mask, shift_bits;
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struct starfive_gpio_chip *chip =
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container_of(gp->chip, struct starfive_gpio_chip, chip);
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/* set out en*/
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reg_addr = chip->addr + gp->offset;
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reg_addr &= ~(STARFIVE_GPIO_REG_SHIFT_MASK);
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shift_bits = (gp->offset & STARFIVE_GPIO_REG_SHIFT_MASK)
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<< STARFIVE_GPIO_SHIFT_BITS;
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bit_mask = STARFIVE_GPIO_MASK << shift_bits;
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val = readl((void *)reg_addr);
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val &= ~bit_mask;
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writel(val, (void *)reg_addr);
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return 0;
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}
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static void starfive_gpio_set(struct gpio_pin *gp, int value)
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{
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u32 val;
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unsigned long reg_addr;
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u32 bit_mask, shift_bits;
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struct starfive_gpio_chip *chip =
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container_of(gp->chip, struct starfive_gpio_chip, chip);
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reg_addr = chip->addr + gp->offset;
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reg_addr &= ~(STARFIVE_GPIO_REG_SHIFT_MASK);
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shift_bits = (gp->offset & STARFIVE_GPIO_REG_SHIFT_MASK)
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<< STARFIVE_GPIO_SHIFT_BITS;
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bit_mask = STARFIVE_GPIO_MASK << shift_bits;
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/* set output value */
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val = readl((void *)(reg_addr + STARFIVE_GPIO_OUTVAL));
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val &= ~bit_mask;
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val |= value << shift_bits;
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writel(val, (void *)(reg_addr + STARFIVE_GPIO_OUTVAL));
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}
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const struct fdt_gpio fdt_gpio_starfive;
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static int starfive_gpio_init(const void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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int rc;
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struct starfive_gpio_chip *chip;
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u64 addr;
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chip = sbi_zalloc(sizeof(*chip));
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if (!chip)
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return SBI_ENOMEM;
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rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
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if (rc) {
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sbi_free(chip);
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return rc;
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}
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chip->addr = addr;
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chip->chip.driver = &fdt_gpio_starfive;
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chip->chip.id = nodeoff;
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chip->chip.ngpio = STARFIVE_GPIO_PINS_DEF;
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chip->chip.direction_output = starfive_gpio_direction_output;
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chip->chip.set = starfive_gpio_set;
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rc = gpio_chip_add(&chip->chip);
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if (rc) {
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sbi_free(chip);
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return rc;
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}
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return 0;
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}
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static const struct fdt_match starfive_gpio_match[] = {
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{ .compatible = "starfive,jh7110-sys-pinctrl" },
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{ .compatible = "starfive,iomux-pinctrl" },
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{ },
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};
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const struct fdt_gpio fdt_gpio_starfive = {
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.driver = {
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.match_table = starfive_gpio_match,
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.init = starfive_gpio_init,
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},
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.xlate = fdt_gpio_simple_xlate,
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};
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