diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/power/reset/hisi-reboot.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/power/reset/hisi-reboot.c b/drivers/power/reset/hisi-reboot.c new file mode 100644 index 000000000..344093405 --- /dev/null +++ b/drivers/power/reset/hisi-reboot.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HiSilicon SoC reset code + * + * Copyright (c) 2014 HiSilicon Ltd. + * Copyright (c) 2014 Linaro Ltd. + * + * Author: Haojian Zhuang <haojian.zhuang@linaro.org> + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> + +#include <asm/proc-fns.h> + +static void __iomem *base; +static u32 reboot_offset; + +static int hisi_restart_handler(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + writel_relaxed(0xdeadbeef, base + reboot_offset); + + while (1) + cpu_do_idle(); + + return NOTIFY_DONE; +} + +static struct notifier_block hisi_restart_nb = { + .notifier_call = hisi_restart_handler, + .priority = 128, +}; + +static int hisi_reboot_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + int err; + + base = of_iomap(np, 0); + if (!base) { + WARN(1, "failed to map base address"); + return -ENODEV; + } + + if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) { + pr_err("failed to find reboot-offset property\n"); + iounmap(base); + return -EINVAL; + } + + err = register_restart_handler(&hisi_restart_nb); + if (err) { + dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", + err); + iounmap(base); + } + + return err; +} + +static const struct of_device_id hisi_reboot_of_match[] = { + { .compatible = "hisilicon,sysctrl" }, + {} +}; +MODULE_DEVICE_TABLE(of, hisi_reboot_of_match); + +static struct platform_driver hisi_reboot_driver = { + .probe = hisi_reboot_probe, + .driver = { + .name = "hisi-reboot", + .of_match_table = hisi_reboot_of_match, + }, +}; +module_platform_driver(hisi_reboot_driver); |