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73 lines
2.0 KiB
73 lines
2.0 KiB
/* |
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* Copyright (C) 2016 Broadcom |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation version 2. |
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* |
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any |
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* kind, whether express or implied; without even the implied warranty |
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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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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