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From 3386d22d3b3bcb202ef186d699d9dddfa681e13b Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Sat, 12 May 2018 21:35:43 +0100
Subject: [PATCH] firmware/raspberrypi: Notify firmware of a reboot
Register for reboot notifications, sending RPI_FIRMWARE_NOTIFY_REBOOT
over the mailbox interface on reception.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/firmware/raspberrypi.c | 40 +++++++++++++++++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -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_fir
}
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_firmwa
.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);
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