MIPS: Support per-device DMA coherence

[linux.git] / arch / mips / include / asm / dma-coherence.h

diff --git a/arch/mips/include/asm/dma-coherence.h b/arch/mips/include/asm/dma-coherence.h
index bc5e85d579e607a61420a7c0cd7a1c6b716d8f4c..72d0eab02afcbbfc33bd6ee653389a30887c1f3a 100644 (file)
--- a/arch/mips/include/asm/dma-coherence.h
+++ b/arch/mips/include/asm/dma-coherence.h
@@ -9,14 +9,22 @@
 #ifndef __ASM_DMA_COHERENCE_H
 #define __ASM_DMA_COHERENCE_H
 
-#ifdef CONFIG_DMA_MAYBE_COHERENT
-extern int coherentio;
+enum coherent_io_user_state {
+       IO_COHERENCE_DEFAULT,
+       IO_COHERENCE_ENABLED,
+       IO_COHERENCE_DISABLED,
+};
+
+#if defined(CONFIG_DMA_PERDEV_COHERENT)
+/* Don't provide (hw_)coherentio to avoid misuse */
+#elif defined(CONFIG_DMA_MAYBE_COHERENT)
+extern enum coherent_io_user_state coherentio;
 extern int hw_coherentio;
 #else
 #ifdef CONFIG_DMA_COHERENT
-#define coherentio     1
+#define coherentio     IO_COHERENCE_ENABLED
 #else
-#define coherentio     0
+#define coherentio     IO_COHERENCE_DISABLED
 #endif
 #define hw_coherentio  0
 #endif /* CONFIG_DMA_MAYBE_COHERENT */