mirror of
https://github.com/riscv-software-src/opensbi.git
synced 2026-09-08 18:21:29 +01:00
Benoît Monin
f1ab1b45ef
Add a driver for the system reset function found in Metanoia MT2824 SoC and enable it in the generic platform configuration. Originally-by: Jun Chang <jun.chang@metanoia-comm.com> Signed-off-by: Benoît Monin <benoit.monin@bootlin.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20260724-mt5824-v3-2-9a7d17d69974@bootlin.com Signed-off-by: Anup Patel <anup@brainfault.org>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2026 Metanoia Communications Inc.
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*
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*/
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_platform.h>
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#include <sbi/sbi_system.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/fdt/fdt_driver.h>
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#define SWRSTREQ_CTRL_REG_OFFSET 0x00
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#define SWRSTREQ_REG_OFFSET 0x04
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struct reset_metanoia_data {
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u8 *reg_base;
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};
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static struct reset_metanoia_data reset_data;
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static int metanoia_system_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_WARM_REBOOT:
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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return 1;
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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default:
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return 0;
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}
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}
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static void metanoia_system_reset(u32 type, u32 reason)
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{
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writew(0x1, reset_data.reg_base + SWRSTREQ_CTRL_REG_OFFSET);
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writew(0x1, reset_data.reg_base + SWRSTREQ_REG_OFFSET);
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}
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static struct sbi_system_reset_device metanoia_reset = {
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.name = "metanoia-mt2824-reboot",
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.system_reset_check = metanoia_system_reset_check,
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.system_reset = metanoia_system_reset,
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};
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static int metanoia_reset_init(const void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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u64 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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reset_data.reg_base = (u8 *)(ulong)reg_addr;
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sbi_system_reset_add_device(&metanoia_reset);
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return 0;
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}
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static const struct fdt_match metanoia_reset_match[] = {
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{ .compatible = "metanoia,mt2824-reboot" },
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{ /* sentinel */ }
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};
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const struct fdt_driver fdt_reset_metanoia = {
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.match_table = metanoia_reset_match,
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.init = metanoia_reset_init,
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};
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