From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- drivers/power/reset/brcm-kona-reset.c | 73 +++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 drivers/power/reset/brcm-kona-reset.c (limited to 'drivers/power/reset/brcm-kona-reset.c') diff --git a/drivers/power/reset/brcm-kona-reset.c b/drivers/power/reset/brcm-kona-reset.c new file mode 100644 index 000000000..8eaa959d8 --- /dev/null +++ b/drivers/power/reset/brcm-kona-reset.c @@ -0,0 +1,73 @@ +/* + * 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 +#include +#include +#include + +#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); -- cgit v1.2.3