mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-26 04:16:39 +00:00
power: reset: at91-reset: add sysfs interface to the power on reason
Introduce a list of generic reset sources and use them to export the power on reason through sysfs. Update the ABI documentation to describe this new interface. Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> [Miquel Raynal: Follow-up on Kamel's work, 4 years later] Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
parent
7b9fc309c0
commit
d40befed9a
3 changed files with 58 additions and 10 deletions
12
Documentation/ABI/testing/sysfs-platform-power-on-reason
Normal file
12
Documentation/ABI/testing/sysfs-platform-power-on-reason
Normal file
|
@ -0,0 +1,12 @@
|
||||||
|
What: /sys/devices/platform/.../power_on_reason
|
||||||
|
Date: June 2023
|
||||||
|
KernelVersion: 6.5
|
||||||
|
Contact: Kamel Bouhara <kamel.bouhara@bootlin.com>
|
||||||
|
Description: Shows system power on reason. The following strings/reasons can
|
||||||
|
be read (the list can be extended):
|
||||||
|
"regular power-up", "RTC wakeup", "watchdog timeout",
|
||||||
|
"software reset", "reset button action", "CPU clock failure",
|
||||||
|
"crystal oscillator failure", "brown-out reset",
|
||||||
|
"unknown reason".
|
||||||
|
|
||||||
|
The file is read only.
|
|
@ -18,6 +18,7 @@
|
||||||
#include <linux/platform_device.h>
|
#include <linux/platform_device.h>
|
||||||
#include <linux/reboot.h>
|
#include <linux/reboot.h>
|
||||||
#include <linux/reset-controller.h>
|
#include <linux/reset-controller.h>
|
||||||
|
#include <linux/power/power_on_reason.h>
|
||||||
|
|
||||||
#include <soc/at91/at91sam9_ddrsdr.h>
|
#include <soc/at91/at91sam9_ddrsdr.h>
|
||||||
#include <soc/at91/at91sam9_sdramc.h>
|
#include <soc/at91/at91sam9_sdramc.h>
|
||||||
|
@ -149,44 +150,54 @@ static int at91_reset(struct notifier_block *this, unsigned long mode,
|
||||||
return NOTIFY_DONE;
|
return NOTIFY_DONE;
|
||||||
}
|
}
|
||||||
|
|
||||||
static const char * __init at91_reset_reason(struct at91_reset *reset)
|
static const char *at91_reset_reason(struct at91_reset *reset)
|
||||||
{
|
{
|
||||||
u32 reg = readl(reset->rstc_base + AT91_RSTC_SR);
|
u32 reg = readl(reset->rstc_base + AT91_RSTC_SR);
|
||||||
const char *reason;
|
const char *reason;
|
||||||
|
|
||||||
switch ((reg & AT91_RSTC_RSTTYP) >> 8) {
|
switch ((reg & AT91_RSTC_RSTTYP) >> 8) {
|
||||||
case RESET_TYPE_GENERAL:
|
case RESET_TYPE_GENERAL:
|
||||||
reason = "general reset";
|
reason = POWER_ON_REASON_REGULAR;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_WAKEUP:
|
case RESET_TYPE_WAKEUP:
|
||||||
reason = "wakeup";
|
reason = POWER_ON_REASON_RTC;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_WATCHDOG:
|
case RESET_TYPE_WATCHDOG:
|
||||||
reason = "watchdog reset";
|
reason = POWER_ON_REASON_WATCHDOG;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_SOFTWARE:
|
case RESET_TYPE_SOFTWARE:
|
||||||
reason = "software reset";
|
reason = POWER_ON_REASON_SOFTWARE;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_USER:
|
case RESET_TYPE_USER:
|
||||||
reason = "user reset";
|
reason = POWER_ON_REASON_RST_BTN;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_CPU_FAIL:
|
case RESET_TYPE_CPU_FAIL:
|
||||||
reason = "CPU clock failure detection";
|
reason = POWER_ON_REASON_CPU_CLK_FAIL;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_XTAL_FAIL:
|
case RESET_TYPE_XTAL_FAIL:
|
||||||
reason = "32.768 kHz crystal failure detection";
|
reason = POWER_ON_REASON_XTAL_FAIL;
|
||||||
break;
|
break;
|
||||||
case RESET_TYPE_ULP2:
|
case RESET_TYPE_ULP2:
|
||||||
reason = "ULP2 reset";
|
reason = POWER_ON_REASON_BROWN_OUT;
|
||||||
break;
|
break;
|
||||||
default:
|
default:
|
||||||
reason = "unknown reset";
|
reason = POWER_ON_REASON_UNKNOWN;
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
|
||||||
return reason;
|
return reason;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static ssize_t power_on_reason_show(struct device *dev,
|
||||||
|
struct device_attribute *attr, char *buf)
|
||||||
|
{
|
||||||
|
struct platform_device *pdev = to_platform_device(dev);
|
||||||
|
struct at91_reset *reset = platform_get_drvdata(pdev);
|
||||||
|
|
||||||
|
return sprintf(buf, "%s\n", at91_reset_reason(reset));
|
||||||
|
}
|
||||||
|
static DEVICE_ATTR_RO(power_on_reason);
|
||||||
|
|
||||||
static const struct of_device_id at91_ramc_of_match[] = {
|
static const struct of_device_id at91_ramc_of_match[] = {
|
||||||
{
|
{
|
||||||
.compatible = "atmel,at91sam9260-sdramc",
|
.compatible = "atmel,at91sam9260-sdramc",
|
||||||
|
@ -391,6 +402,12 @@ static int __init at91_reset_probe(struct platform_device *pdev)
|
||||||
if (ret)
|
if (ret)
|
||||||
goto disable_clk;
|
goto disable_clk;
|
||||||
|
|
||||||
|
ret = device_create_file(&pdev->dev, &dev_attr_power_on_reason);
|
||||||
|
if (ret) {
|
||||||
|
dev_err(&pdev->dev, "Could not create sysfs entry\n");
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
dev_info(&pdev->dev, "Starting after %s\n", at91_reset_reason(reset));
|
dev_info(&pdev->dev, "Starting after %s\n", at91_reset_reason(reset));
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
|
|
19
include/linux/power/power_on_reason.h
Normal file
19
include/linux/power/power_on_reason.h
Normal file
|
@ -0,0 +1,19 @@
|
||||||
|
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||||
|
/*
|
||||||
|
* Author: Kamel Bouhra <kamel.bouhara@bootlin.com>
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef POWER_ON_REASON_H
|
||||||
|
#define POWER_ON_REASON_H
|
||||||
|
|
||||||
|
#define POWER_ON_REASON_REGULAR "regular power-up"
|
||||||
|
#define POWER_ON_REASON_RTC "RTC wakeup"
|
||||||
|
#define POWER_ON_REASON_WATCHDOG "watchdog timeout"
|
||||||
|
#define POWER_ON_REASON_SOFTWARE "software reset"
|
||||||
|
#define POWER_ON_REASON_RST_BTN "reset button action"
|
||||||
|
#define POWER_ON_REASON_CPU_CLK_FAIL "CPU clock failure"
|
||||||
|
#define POWER_ON_REASON_XTAL_FAIL "crystal oscillator failure"
|
||||||
|
#define POWER_ON_REASON_BROWN_OUT "brown-out reset"
|
||||||
|
#define POWER_ON_REASON_UNKNOWN "unknown reason"
|
||||||
|
|
||||||
|
#endif /* POWER_ON_REASON_H */
|
Loading…
Reference in a new issue