mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2026-06-17 16:41:19 +01:00
Inochi Amaoto
dec9141a77
Litex SoC controller supports reboot function by toggling the first bit of the ctrl register. Add a reset driver so other software can use it. Signed-off-by: Inochi Amaoto <inochiama@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260529085234.1682842-1-inochiama@gmail.com Signed-off-by: Anup Patel <anup@brainfault.org>
67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2026 Inochi Amaoto <inochiama@gmail.com>
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*/
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#include <libfdt.h>
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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_system.h>
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#include <sbi_utils/fdt/fdt_driver.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#define RESET_CTRL 0x0
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static volatile u32 *litex_soc_base;
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static int litex_reset_check(u32 type, u32 reason)
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{
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switch (type) {
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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return 255;
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}
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return 0;
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}
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static void litex_do_reset(u32 type, u32 reason)
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{
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writel_relaxed(0x1, litex_soc_base + RESET_CTRL);
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}
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static struct sbi_system_reset_device litex_reset = {
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.name = "litex-reset",
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.system_reset_check = litex_reset_check,
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.system_reset = litex_do_reset
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};
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static int litex_reset_init(const void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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uint64_t reg_addr;
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int rc;
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rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, NULL);
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if (rc < 0 || !reg_addr)
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return SBI_ENODEV;
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litex_soc_base = (volatile u32 *)(unsigned long)reg_addr;
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sbi_system_reset_add_device(&litex_reset);
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return 0;
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}
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static const struct fdt_match litex_reset_match[] = {
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{ .compatible = "litex,soc-controller" },
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{ },
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};
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const struct fdt_driver fdt_reset_litex = {
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.match_table = litex_reset_match,
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.init = litex_reset_init,
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};
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