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From a32b0e7851320cba0144d20e87e5326ee81e1063 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Tue, 5 Feb 2013 20:57:55 +0100
Subject: [PATCH] spi/ath79: add shutdown handler
commit 7410e848583f9120dd5f9414629f01bb76b5ee5f upstream.
The SPI controller of the AR7xxx/AR9xxx SoCs
have a special mode which allows the SoC to
directly read data from SPI flash chips. In
this mode, the content of the SPI flash chip
can be accessed via a memory mapped region.
During early init time, the kernel expects
that the flash chip is accessible through
that memory region because it reads board
specific values (e.g. MAC address, WiFi
calibration data) from the flash on various
boards.
This is working if the kernel is loaded
directly by the bootloader because that
leaves the SPI controller in the special
mode. However it is not working in a kexec'd
kernel because the SPI driver does not restore
the special mode during shutdown.
The patch adds a shutdown handler to fix this
issue.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
drivers/spi/spi-ath79.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platf
return 0;
}
+static void ath79_spi_shutdown(struct platform_device *pdev)
+{
+ ath79_spi_remove(pdev);
+}
+
static struct platform_driver ath79_spi_driver = {
.probe = ath79_spi_probe,
.remove = ath79_spi_remove,
+ .shutdown = ath79_spi_shutdown,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
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