64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (C) 2016 Broadcom
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/reboot.h>
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#define RSTMGR_REG_WR_ACCESS_OFFSET 0
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#define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4
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#define RSTMGR_WR_PASSWORD 0xa5a5
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#define RSTMGR_WR_PASSWORD_SHIFT 8
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#define RSTMGR_WR_ACCESS_ENABLE 1
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static void __iomem *kona_reset_base;
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static int kona_reset_handler(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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/*
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* A soft reset is triggered by writing a 0 to bit 0 of the soft reset
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* register. To write to that register we must first write the password
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* and the enable bit in the write access enable register.
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*/
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writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) |
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RSTMGR_WR_ACCESS_ENABLE,
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kona_reset_base + RSTMGR_REG_WR_ACCESS_OFFSET);
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writel(0, kona_reset_base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET);
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return NOTIFY_DONE;
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}
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static struct notifier_block kona_reset_nb = {
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.notifier_call = kona_reset_handler,
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.priority = 128,
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};
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static int kona_reset_probe(struct platform_device *pdev)
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{
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struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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kona_reset_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(kona_reset_base))
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return PTR_ERR(kona_reset_base);
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return register_restart_handler(&kona_reset_nb);
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}
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static const struct of_device_id of_match[] = {
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{ .compatible = "brcm,bcm21664-resetmgr" },
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{},
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};
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static struct platform_driver bcm_kona_reset_driver = {
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.probe = kona_reset_probe,
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.driver = {
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.name = "brcm-kona-reset",
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.of_match_table = of_match,
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},
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};
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builtin_platform_driver(bcm_kona_reset_driver);
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