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/* * Copyright (C) 2016 Broadcom * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/io.h> #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/reboot.h> #define RSTMGR_REG_WR_ACCESS_OFFSET 0 #define RSTMGR_REG_CHIP_SOFT_RST_OFFSET 4 #define RSTMGR_WR_PASSWORD 0xa5a5 #define RSTMGR_WR_PASSWORD_SHIFT 8 #define RSTMGR_WR_ACCESS_ENABLE 1 static void __iomem *kona_reset_base; static int kona_reset_handler(struct notifier_block *this, unsigned long mode, void *cmd) { /* * A soft reset is triggered by writing a 0 to bit 0 of the soft reset * register. To write to that register we must first write the password * and the enable bit in the write access enable register. */ writel((RSTMGR_WR_PASSWORD << RSTMGR_WR_PASSWORD_SHIFT) | RSTMGR_WR_ACCESS_ENABLE, kona_reset_base + RSTMGR_REG_WR_ACCESS_OFFSET); writel(0, kona_reset_base + RSTMGR_REG_CHIP_SOFT_RST_OFFSET); return NOTIFY_DONE; } static struct notifier_block kona_reset_nb = { .notifier_call = kona_reset_handler, .priority = 128, }; static int kona_reset_probe(struct platform_device *pdev) { struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); kona_reset_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(kona_reset_base)) return PTR_ERR(kona_reset_base); return register_restart_handler(&kona_reset_nb); } static const struct of_device_id of_match[] = { { .compatible = "brcm,bcm21664-resetmgr" }, {}, }; static struct platform_driver bcm_kona_reset_driver = { .probe = kona_reset_probe, .driver = { .name = "brcm-kona-reset", .of_match_table = of_match, }, }; builtin_platform_driver(bcm_kona_reset_driver); |