tegra: Added spinlock primitives to NvOs.

Added spinlock primitives to NvOs.
Converted PMC scratch registers access mutexes to spin-locks.

Change-Id: I862baf4d3a7a8fcdf1e8552356805afd4ac897c3

2 files changed, 40 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/nvos/nvos.c b/arch/arm/mach-tegra/nvos/nvos.c
index 14f531f76f13..3e98dfc03063 100644
--- a/arch/arm/mach-tegra/nvos/nvos.c
+++ b/arch/arm/mach-tegra/nvos/nvos.c
@@ -772,6 +772,42 @@ void NvOsIntrMutexDestroy(NvOsIntrMutexHandle mutex)
         kfree(mutex);
 }
 
+typedef struct NvOsSpinMutexRec
+{
+    spinlock_t lock;
+} NvOsSpinMutex;
+
+NvError NvOsSpinMutexCreate(NvOsSpinMutexHandle *mutex)
+{
+    NvOsSpinMutex *m;
+
+    m = kzalloc( sizeof(NvOsSpinMutex), GFP_KERNEL );
+    if( !m )
+        return NvError_InsufficientMemory;
+
+    spin_lock_init( &m->lock );
+    *mutex = m;
+    return NvSuccess;
+}
+
+void NvOsSpinMutexLock(NvOsSpinMutexHandle mutex)
+{
+    NV_ASSERT( mutex );
+    spin_lock( &mutex->lock );
+}
+
+void NvOsSpinMutexUnlock(NvOsSpinMutexHandle mutex)
+{
+    NV_ASSERT( mutex );
+    spin_unlock( &mutex->lock );
+}
+
+void NvOsSpinMutexDestroy(NvOsSpinMutexHandle mutex)
+{
+    if (mutex)
+        kfree(mutex);
+}
+
 typedef struct NvOsSemaphoreRec
 {
     struct semaphore sem;
diff --git a/arch/arm/mach-tegra/nvos/nvos_exports.c b/arch/arm/mach-tegra/nvos/nvos_exports.c
index 6e39f50ffde1..916daca3ec28 100644
--- a/arch/arm/mach-tegra/nvos/nvos_exports.c
+++ b/arch/arm/mach-tegra/nvos/nvos_exports.c
@@ -112,6 +112,10 @@ EXPORT_SYMBOL(NvOsIntrMutexCreate);
 EXPORT_SYMBOL(NvOsIntrMutexLock);
 EXPORT_SYMBOL(NvOsIntrMutexUnlock);
 EXPORT_SYMBOL(NvOsIntrMutexDestroy);
+EXPORT_SYMBOL(NvOsSpinMutexCreate);
+EXPORT_SYMBOL(NvOsSpinMutexLock);
+EXPORT_SYMBOL(NvOsSpinMutexUnlock);
+EXPORT_SYMBOL(NvOsSpinMutexDestroy);
 EXPORT_SYMBOL(NvOsSemaphoreCreate);
 EXPORT_SYMBOL(NvOsSemaphoreClone);
 EXPORT_SYMBOL(NvOsSemaphoreUnmarshal);