mirror of
https://github.com/riscv-software-src/opensbi
synced 2025-11-04 05:50:22 +00:00
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>
92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <libfdt.h>
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#include <sbi/sbi_error.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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/* List of FDT gpio drivers generated at compile time */
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extern const struct fdt_driver *const fdt_gpio_drivers[];
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static int fdt_gpio_init(const void *fdt, int nodeoff)
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{
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/* Check "gpio-controller" property */
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if (!fdt_getprop(fdt, nodeoff, "gpio-controller", NULL))
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return SBI_EINVAL;
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return fdt_driver_init_by_offset(fdt, nodeoff, fdt_gpio_drivers);
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}
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static int fdt_gpio_chip_find(const void *fdt, int nodeoff,
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struct gpio_chip **out_chip)
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{
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int rc;
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struct gpio_chip *chip = gpio_chip_find(nodeoff);
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if (!chip) {
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/* GPIO chip not found so initialize matching driver */
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rc = fdt_gpio_init(fdt, nodeoff);
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if (rc)
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return rc;
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/* Try to find GPIO chip again */
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chip = gpio_chip_find(nodeoff);
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if (!chip)
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return SBI_ENOSYS;
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}
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if (out_chip)
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*out_chip = chip;
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return 0;
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}
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int fdt_gpio_pin_get(const void *fdt, int nodeoff, int index,
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struct gpio_pin *out_pin)
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{
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int rc;
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const struct fdt_gpio *drv;
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struct gpio_chip *chip = NULL;
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struct fdt_phandle_args pargs;
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if (!fdt || (nodeoff < 0) || (index < 0) || !out_pin)
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return SBI_EINVAL;
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pargs.node_offset = pargs.args_count = 0;
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rc = fdt_parse_phandle_with_args(fdt, nodeoff,
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"gpios", "#gpio-cells",
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index, &pargs);
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if (rc)
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return rc;
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rc = fdt_gpio_chip_find(fdt, pargs.node_offset, &chip);
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if (rc)
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return rc;
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drv = chip->driver;
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if (!drv || !drv->xlate)
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return SBI_ENOSYS;
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return drv->xlate(chip, &pargs, out_pin);
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}
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int fdt_gpio_simple_xlate(struct gpio_chip *chip,
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const struct fdt_phandle_args *pargs,
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struct gpio_pin *out_pin)
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{
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if ((pargs->args_count < 2) || (chip->ngpio <= pargs->args[0]))
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return SBI_EINVAL;
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out_pin->chip = chip;
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out_pin->offset = pargs->args[0];
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out_pin->flags = pargs->args[1];
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return 0;
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}
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