Re: [PATCH u-boot-marvell v2 2/6] arm: mvebu: turris_mox: add support for board rescue mode

["Pali Rohár" <pali@kernel.org>]

On Monday 07 June 2021 16:34:47 Marek Behún wrote:
> Add necessary config options and board code to support board factory
> reset / rescue mode on Turris MOX.
> 
> In order to also support invoking rescue mode from U-Boot console,
> without having to press the factory reset button, put the rescue command
> into `bootcmd_rescue` default environment variable. When factory reset
> button is pressed, invoke rescue mode via distroboot by setting
> `boot_targets` to `rescue`.
> 
> Rescue boot from console can be invoked by running
>   run bootcmd_rescue
> 
> Signed-off-by: Marek Behún <marek.behun@nic.cz>

Reviewed-by: Pali Rohár <pali@kernel.org>

> ---
>  board/CZ.NIC/turris_mox/turris_mox.c | 71 ++++++++++++++++++++++++++++
>  configs/turris_mox_defconfig         |  6 +++
>  include/configs/turris_mox.h         |  9 ++++
>  3 files changed, 86 insertions(+)
> 
> diff --git a/board/CZ.NIC/turris_mox/turris_mox.c b/board/CZ.NIC/turris_mox/turris_mox.c
> index 15cbf92550..a78f33661e 100644
> --- a/board/CZ.NIC/turris_mox/turris_mox.c
> +++ b/board/CZ.NIC/turris_mox/turris_mox.c
> @@ -10,11 +10,13 @@
>  #include <asm/global_data.h>
>  #include <asm/io.h>
>  #include <asm/gpio.h>
> +#include <button.h>
>  #include <clk.h>
>  #include <dm.h>
>  #include <env.h>
>  #include <fdt_support.h>
>  #include <init.h>
> +#include <led.h>
>  #include <linux/delay.h>
>  #include <linux/libfdt.h>
>  #include <linux/string.h>
> @@ -44,6 +46,8 @@
>  #define SFP_GPIO_PATH	"/soc/internal-regs@d0000000/spi@10600/moxtet@1/gpio@0"
>  #define PCIE_PATH	"/soc/pcie@d0070000"
>  #define SFP_PATH	"/sfp"
> +#define LED_PATH	"/leds/led"
> +#define BUTTON_PATH	"/gpio-keys/reset"
>  
>  DECLARE_GLOBAL_DATA_PTR;
>  
> @@ -373,6 +377,71 @@ int misc_init_r(void)
>  	return 0;
>  }
>  
> +static bool read_reset_button(void)
> +{
> +	struct udevice *button, *led;
> +	int i;
> +
> +	if (device_get_global_by_ofnode(ofnode_path(BUTTON_PATH), &button)) {
> +		printf("Cannot find reset button!\n");
> +		return false;
> +	}
> +
> +	if (device_get_global_by_ofnode(ofnode_path(LED_PATH), &led)) {
> +		printf("Cannot find status LED!\n");
> +		return false;
> +	}
> +
> +	led_set_state(led, LEDST_ON);
> +
> +	for (i = 0; i < 21; ++i) {
> +		if (button_get_state(button) != BUTTON_ON)
> +			return false;
> +		if (i < 20)
> +			mdelay(50);
> +	}
> +
> +	led_set_state(led, LEDST_OFF);
> +
> +	return true;
> +}
> +
> +static void handle_reset_button(void)
> +{
> +	if (read_reset_button()) {
> +		const char * const vars[3] = {
> +			"bootcmd",
> +			"bootcmd_rescue",
> +			"distro_bootcmd",
> +		};
> +
> +		/*
> +		 * Set the above envs to their default values, in case the user
> +		 * managed to break them.
> +		 */
> +		env_set_default_vars(3, (char * const *)vars, 0);
> +
> +		/* Ensure bootcmd_rescue is used by distroboot */
> +		env_set("boot_targets", "rescue");
> +
> +		printf("RESET button was pressed, overwriting boot_targets!\n");
> +	} else {
> +		/*
> +		 * In case the user somehow managed to save environment with
> +		 * boot_targets=rescue, reset boot_targets to default value.
> +		 * This could happen in subsequent commands if bootcmd_rescue
> +		 * failed.
> +		 */
> +		if (!strcmp(env_get("boot_targets"), "rescue")) {
> +			const char * const vars[1] = {
> +				"boot_targets",
> +			};
> +
> +			env_set_default_vars(1, (char * const *)vars, 0);
> +		}
> +	}
> +}
> +
>  static void mox_print_info(void)
>  {
>  	int ret, board_version, ram_size;
> @@ -543,6 +612,8 @@ int last_stage_init(void)
>  
>  	printf("\n");
>  
> +	handle_reset_button();
> +
>  	return 0;
>  }
>  
> diff --git a/configs/turris_mox_defconfig b/configs/turris_mox_defconfig
> index 75524babbc..d6d37a3d7d 100644
> --- a/configs/turris_mox_defconfig
> +++ b/configs/turris_mox_defconfig
> @@ -23,10 +23,14 @@ CONFIG_SYS_CONSOLE_INFO_QUIET=y
>  # CONFIG_DISPLAY_BOARDINFO is not set
>  CONFIG_ARCH_EARLY_INIT_R=y
>  CONFIG_MISC_INIT_R=y
> +CONFIG_BUTTON=y
> +CONFIG_BUTTON_GPIO=y
> +CONFIG_CMD_BUTTON=y
>  CONFIG_CMD_CLK=y
>  # CONFIG_CMD_FLASH is not set
>  CONFIG_CMD_GPIO=y
>  CONFIG_CMD_I2C=y
> +CONFIG_CMD_LED=y
>  CONFIG_CMD_MMC=y
>  CONFIG_CMD_PCI=y
>  CONFIG_CMD_SPI=y
> @@ -46,6 +50,8 @@ CONFIG_CLK=y
>  CONFIG_CLK_MVEBU=y
>  # CONFIG_MVEBU_GPIO is not set
>  CONFIG_DM_I2C=y
> +CONFIG_LED=y
> +CONFIG_LED_GPIO=y
>  CONFIG_MISC=y
>  CONFIG_MMC_SDHCI=y
>  CONFIG_MMC_SDHCI_SDMA=y
> diff --git a/include/configs/turris_mox.h b/include/configs/turris_mox.h
> index 51445ec60a..b148b1621a 100644
> --- a/include/configs/turris_mox.h
> +++ b/include/configs/turris_mox.h
> @@ -75,12 +75,21 @@
>  
>  #include <config_distro_bootcmd.h>
>  
> +#define TURRIS_MOX_BOOTCMD_RESCUE \
> +	"setenv bootargs \"console=ttyMV0,115200 " \
> +			  "earlycon=ar3700_uart,0xd0012000\" && " \
> +	"sf probe && " \
> +	"sf read 0x5000000 0x190000 && " \
> +	"lzmadec 0x5000000 0x5800000 && " \
> +	"bootm 0x5800000"
> +
>  #define CONFIG_EXTRA_ENV_SETTINGS	\
>  	"scriptaddr=0x4d00000\0"	\
>  	"pxefile_addr_r=0x4e00000\0"	\
>  	"fdt_addr_r=0x4f00000\0"	\
>  	"kernel_addr_r=0x5000000\0"	\
>  	"ramdisk_addr_r=0x8000000\0"	\
> +	"bootcmd_rescue=" TURRIS_MOX_BOOTCMD_RESCUE "\0" \
>  	BOOTENV
>  
>  #endif /* _CONFIG_TURRIS_MOX_H */
> -- 
> 2.31.1
>