[ar71xx] add flash locking code

[openwrt.git] / target / linux / ar71xx / files / arch / mips / ar71xx / ar71xx.c

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/ar71xx.c b/target/linux/ar71xx/files/arch/mips/ar71xx/ar71xx.c
index f224e82..ea7ae14 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/ar71xx.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/ar71xx.c
@@ -1,7 +1,7 @@
 /*
  *  AR71xx SoC routines
  *
- *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  *  This program is free software; you can redistribute it and/or modify it
@@ -12,9 +12,13 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/types.h>
+#include <linux/mutex.h>
 
 #include <asm/mach-ar71xx/ar71xx.h>
 
+static DEFINE_MUTEX(ar71xx_flash_mutex);
+static int ar71xx_flash_lock_enabled;
+
 void __iomem *ar71xx_ddr_base;
 EXPORT_SYMBOL_GPL(ar71xx_ddr_base);
 
@@ -98,3 +102,21 @@ void ar71xx_ddr_flush(u32 reg)
 }
 EXPORT_SYMBOL_GPL(ar71xx_ddr_flush);
 
+void  __init ar71xx_flash_lock_enable(void)
+{
+       ar71xx_flash_lock_enabled = 1;
+}
+
+void ar71xx_flash_acquire(void)
+{
+       if (ar71xx_flash_lock_enabled)
+               mutex_lock(&ar71xx_flash_mutex);
+}
+EXPORT_SYMBOL_GPL(ar71xx_flash_acquire);
+
+void ar71xx_flash_release(void)
+{
+       if (ar71xx_flash_lock_enabled)
+               mutex_unlock(&ar71xx_flash_mutex);
+}
+EXPORT_SYMBOL_GPL(ar71xx_flash_release);