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firmware/raspberrypi: Notify firmware of a reboot

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Register for reboot notifications, sending RPI_FIRMWARE_NOTIFY_REBOOT
over the mailbox interface on reception.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2018-05-12 21:35:43 +01:00
committed by popcornmix
parent ec5e2870c6
commit 792e4b7ca1
1 changed files with 39 additions and 1 deletions
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40
drivers/firmware/raspberrypi.c
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@@ -12,6 +12,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/reboot.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
@@ -177,6 +178,26 @@ int rpi_firmware_property(struct rpi_firmware *fw,
}
EXPORT_SYMBOL_GPL(rpi_firmware_property);
static int rpi_firmware_notify_reboot(struct notifier_block *nb,
unsigned long action,
void *data)
{
struct rpi_firmware *fw;
struct platform_device *pdev = g_pdev;
if (!pdev)
return 0;
fw = platform_get_drvdata(pdev);
if (!fw)
return 0;
(void)rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT,
0, 0);
return 0;
}
static void
rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
{
@@ -307,15 +328,32 @@ static struct platform_driver rpi_firmware_driver = {
.remove = rpi_firmware_remove,
};
static struct notifier_block rpi_firmware_reboot_notifier = {
.notifier_call = rpi_firmware_notify_reboot,
};
static int __init rpi_firmware_init(void)
{
return platform_driver_register(&rpi_firmware_driver);
int ret = register_reboot_notifier(&rpi_firmware_reboot_notifier);
if (ret)
goto out1;
ret = platform_driver_register(&rpi_firmware_driver);
if (ret)
goto out2;
return 0;
out2:
unregister_reboot_notifier(&rpi_firmware_reboot_notifier);
out1:
return ret;
}
subsys_initcall(rpi_firmware_init);
static void __init rpi_firmware_exit(void)
{
platform_driver_unregister(&rpi_firmware_driver);
unregister_reboot_notifier(&rpi_firmware_reboot_notifier);
}
module_exit(rpi_firmware_exit);