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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);
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