[PATCH v2] ARM: rockchip: add reboot notifier
Eddie Cai
eddie.cai.kernel at gmail.com
Thu Sep 10 19:01:43 PDT 2015
Hi Andy
2015-09-10 19:04 GMT+08:00 Andy Yan <andy.yan at rock-chips.com>:
> rockchip platform have a protocol to pass the kernel reboot
> mode to bootloader by some special registers when system reboot.
> By this way the bootloader can take different action according
> to the different kernel reboot mode, for example, command
> "reboot loader" will reboot the board to rockusb mode, this is
> a very convenient way to get the board enter download mode.
>
> Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
> ---
>
> Changes in v2:
> - check cpu dt node
> - remove a unnecessary of_put_node in function rockchip_get_pmu_regmap
> - fix a align issue
> - use reboot_notifier instead of restart_handler
>
> arch/arm/mach-rockchip/Makefile | 2 +-
> arch/arm/mach-rockchip/loader.h | 22 ++++++++
> arch/arm/mach-rockchip/reboot.c | 111 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 134 insertions(+), 1 deletion(-)
> create mode 100644 arch/arm/mach-rockchip/loader.h
> create mode 100644 arch/arm/mach-rockchip/reboot.c
>
> diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
> index 5c3a9b2..cd291e3 100644
> --- a/arch/arm/mach-rockchip/Makefile
> +++ b/arch/arm/mach-rockchip/Makefile
> @@ -1,5 +1,5 @@
> CFLAGS_platsmp.o := -march=armv7-a
>
> -obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip.o
> +obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip.o reboot.o
> obj-$(CONFIG_PM_SLEEP) += pm.o sleep.o
> obj-$(CONFIG_SMP) += headsmp.o platsmp.o
> diff --git a/arch/arm/mach-rockchip/loader.h b/arch/arm/mach-rockchip/loader.h
> new file mode 100644
> index 0000000..bf51baa
> --- /dev/null
> +++ b/arch/arm/mach-rockchip/loader.h
> @@ -0,0 +1,22 @@
> +#ifndef __MACH_ROCKCHIP_LOADER_H
> +#define __MACH_ROCKCHIP_LOADER_H
> +
> +/*high 24 bits is tag, low 8 bits is type*/
> +#define SYS_LOADER_REBOOT_FLAG 0x5242C300
> +
> +enum {
> + BOOT_NORMAL = 0, /* normal boot */
> + BOOT_LOADER, /* enter loader rockusb mode */
> + BOOT_MASKROM, /* enter maskrom rockusb mode (not support now) */
> + BOOT_RECOVER, /* enter recover */
> + BOOT_NORECOVER, /* do not enter recover */
> + BOOT_SECONDOS, /* boot second OS (not support now)*/
> + BOOT_WIPEDATA, /* enter recover and wipe data. */
> + BOOT_WIPEALL, /* enter recover and wipe all data. */
> + BOOT_CHECKIMG, /* check firmware img with backup part*/
> + BOOT_FASTBOOT, /* enter fast boot mode */
> + BOOT_SECUREBOOT_DISABLE,
> + BOOT_CHARGING, /* enter charge mode */
> + BOOT_MAX /* MAX VALID BOOT TYPE.*/
> +};
> +#endif
> diff --git a/arch/arm/mach-rockchip/reboot.c b/arch/arm/mach-rockchip/reboot.c
> new file mode 100644
> index 0000000..c29f031e
> --- /dev/null
> +++ b/arch/arm/mach-rockchip/reboot.c
> @@ -0,0 +1,111 @@
> +/*
> + * Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * 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; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/reboot.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include "loader.h"
> +
> +#define RK3188_PMU_SYS_REG0 0x40
> +#define RK3288_PMU_SYS_REG0 0x94
I think RK3066 and RK3368 also supported in upstream kernel. And the
protocol is the same. So it would be better to support it here.
> +
> +struct regmap *regmap;
> +int flag_reg;
> +
> +static int rockchip_get_pmu_regmap(void)
> +{
> + struct device_node *node;
> +
> + node = of_find_node_by_path("/cpus");
> + if (!node)
> + return -ENODEV;
> +
> + regmap = syscon_regmap_lookup_by_phandle(node, "rockchip,pmu");
> + of_node_put(node);
> + if (!IS_ERR(regmap))
> + return 0;
> +
> + regmap = syscon_regmap_lookup_by_compatible("rockchip,rk3066-pmu");
> + if (!IS_ERR(regmap))
> + return 0;
> +
> + return -ENODEV;
> +}
> +
> +static int rockchip_get_reboot_flag_regmap(void)
> +{
> + int ret = rockchip_get_pmu_regmap();
> +
> + if (ret < 0)
> + return ret;
> +
> + if (of_machine_is_compatible("rockchip,rk3288")) {
> + flag_reg = RK3288_PMU_SYS_REG0;
> + return 0;
> + } else if (of_machine_is_compatible("rockchip,rk3066a") ||
> + of_machine_is_compatible("rockchip,rk3066b") ||
> + of_machine_is_compatible("rockchip,rk3188")) {
> + flag_reg = RK3188_PMU_SYS_REG0;
> + return 0;
> + }
> +
> + return -ENODEV;
> +}
> +
> +static void rockchip_get_reboot_flag(const char *cmd, u32 *flag)
> +{
> + *flag = SYS_LOADER_REBOOT_FLAG + BOOT_NORMAL;
> +
> + if (cmd) {
> + if (!strcmp(cmd, "loader") || !strcmp(cmd, "bootloader"))
> + *flag = SYS_LOADER_REBOOT_FLAG + BOOT_LOADER;
> + else if (!strcmp(cmd, "recovery"))
> + *flag = SYS_LOADER_REBOOT_FLAG + BOOT_RECOVER;
> + else if (!strcmp(cmd, "charge"))
> + *flag = SYS_LOADER_REBOOT_FLAG + BOOT_CHARGING;
> + }
> +}
> +
> +static int rockchip_reboot_notify(struct notifier_block *this,
> + unsigned long mode, void *cmd)
> +{
> + u32 flag;
> +
> + rockchip_get_reboot_flag(cmd, &flag);
> + regmap_write(regmap, flag_reg, flag);
> +
> + return NOTIFY_DONE;
> +}
> +
> +static struct notifier_block rockchip_reboot_handler = {
> + .notifier_call = rockchip_reboot_notify,
> +};
> +
> +static int __init rockchip_reboot_init(void)
> +{
> + int ret = 0;
> +
> + if (!rockchip_get_reboot_flag_regmap()) {
> + ret = register_reboot_notifier(&rockchip_reboot_handler);
> + if (ret)
> + pr_err("%s: cannot register reboot handler, %d\n",
> + __func__, ret);
> + }
> +
> + return ret;
> +}
> +
> +module_init(rockchip_reboot_init);
> +MODULE_AUTHOR("Andy Yan <andy.yan at rock-chips.com");
> +MODULE_DESCRIPTION("Rockchip platform reboot notifier driver");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
>
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