Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// 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/mod_devicetable.h>
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#include <linux/platform_device.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 sys_off_data *data)
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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 int kona_reset_probe(struct platform_device *pdev)
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{
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kona_reset_base = devm_platform_ioremap_resource(pdev, 0);
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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 devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_RESTART,
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128, kona_reset_handler, NULL);
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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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