Commit 7691fed2 authored by Vaibhav Hiremath's avatar Vaibhav Hiremath Committed by Greg Kroah-Hartman
Browse files

greybus: arche-platform: Introduce FW_FLASHING state 



Introduce FW_FLASHING state to arche-platform driver, to enable
user space to flash/upgrade SVC firmware.

Command to enter into flashing state:

  # echo fw_flashing > /sys/devices/arche_platform.*/state

Testing Done: Tested on EVT1.2 and DB3.5 platform.

Signed-off-by: default avatarVaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 2923c58e

drivers/staging/greybus/arche-platform.c

+27 −0
Original line number Diff line number Diff line
@@ -134,6 +134,23 @@ static int arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdat 
	return 0;

}



static void arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)

{

	dev_info(arche_pdata->dev, "Switching to FW flashing state\n");



	svc_reset_onoff(arche_pdata->svc_reset_gpio,

			arche_pdata->is_reset_act_hi);



	gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);



	usleep_range(100, 200);

	svc_reset_onoff(arche_pdata->svc_reset_gpio,

			!arche_pdata->is_reset_act_hi);



	arche_pdata->state = ARCHE_PLATFORM_STATE_FW_FLASHING;



}



static void arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)

{

	/* Send disconnect/detach event to SVC */
@@ -170,6 +187,14 @@ static ssize_t state_store(struct device *dev, 
			return count;



		dev_warn(arche_pdata->dev, "standby state not supported\n");

	} else if (sysfs_streq(buf, "fw_flashing")) {

		if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)

			return count;



		/* First we want to make sure we power off everything

		 * and then enter FW flashing state */

		arche_platform_poweroff_seq(arche_pdata);

		arche_platform_fw_flashing_seq(arche_pdata);

	} else {

		dev_err(arche_pdata->dev, "unknown state\n");

		ret = -EINVAL;
@@ -190,6 +215,8 @@ static ssize_t state_show(struct device *dev, 
		return sprintf(buf, "active\n");

	case ARCHE_PLATFORM_STATE_STANDBY:

		return sprintf(buf, "standby\n");

	case ARCHE_PLATFORM_STATE_FW_FLASHING:

		return sprintf(buf, "fw_flashing\n");

	default:

		return sprintf(buf, "unknown state\n");

	}

drivers/staging/greybus/arche_platform.h

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ enum arche_platform_state { 
	ARCHE_PLATFORM_STATE_OFF,

	ARCHE_PLATFORM_STATE_ACTIVE,

	ARCHE_PLATFORM_STATE_STANDBY,

	ARCHE_PLATFORM_STATE_FW_FLASHING,

};



int arche_apb_ctrl_probe(struct platform_device *pdev);