mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-13 06:08:07 +00:00
Code Issues Releases Wiki Activity

greybus: arche-platform: Introduce FW_FLASHING state

Browse source 
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: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Vaibhav Hiremath 2016-02-13 02:04:08 +05:30 committed by Greg Kroah-Hartman
parent 2923c58eb5
commit 7691fed20e
2 changed files with 28 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
drivers/staging/greybus/arche-platform.c
View file

@ -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");
}

1
drivers/staging/greybus/arche_platform.h
View file

@ -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);