[POWERPC] DART iommu suspend

This implements save and restore hooks for IOMMUs and implements
it the DART iommu.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 19 insertions, 0 deletions

diff --git a/include/asm-powerpc/iommu.h b/include/asm-powerpc/iommu.h
index b2e56b30306a..870967e47204 100644
--- a/include/asm-powerpc/iommu.h
+++ b/include/asm-powerpc/iommu.h
@@ -26,6 +26,7 @@
 #include <linux/spinlock.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
+#include <asm/machdep.h>
 #include <asm/types.h>
 #include <asm/bitops.h>
 
@@ -109,6 +110,19 @@ static inline void pci_iommu_init(void) { }
 #endif
 
 extern void alloc_dart_table(void);
+#if defined(CONFIG_PPC64) && defined(CONFIG_PM)
+static inline void iommu_save(void)
+{
+        if (ppc_md.iommu_save)
+                ppc_md.iommu_save();
+}
+
+static inline void iommu_restore(void)
+{
+        if (ppc_md.iommu_restore)
+                ppc_md.iommu_restore();
+}
+#endif
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_IOMMU_H */
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index bbd17d0e170d..6fdabd6dfb3e 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -91,6 +91,11 @@ struct machdep_calls {
         void __iomem *  (*ioremap)(phys_addr_t addr, unsigned long size,
                                    unsigned long flags);
         void            (*iounmap)(volatile void __iomem *token);
+
+#ifdef CONFIG_PM
+        void            (*iommu_save)(void);
+        void            (*iommu_restore)(void);
+#endif
 #endif /* CONFIG_PPC64 */
 
         int             (*probe)(void);