[ARM] Hide ISA DMA API when ISA_DMA_API is unset

When ISA_DMA_API is unset, we're not implementing the ISA DMA API,
so there's no point in publishing the prototypes via asm/dma.h, nor
including the machine dependent parts of that API.

This allows us to remove a lot of mach/dma.h files which don't contain
any useful code.  Unfortunately though, some platforms put their own
private non-ISA definitions into mach/dma.h, so we leave these behind
and fix the appropriate #include statments.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/dma.h

@@ -1,13 +1,7 @@
 #ifndef __ASM_ARM_DMA_H
 #define __ASM_ARM_DMA_H
 
-typedef unsigned int dmach_t;
-
-#include <linux/spinlock.h>
 #include <asm/memory.h>
-#include <asm/system.h>
-#include <asm/scatterlist.h>
-#include <mach/dma.h>
 
 /*
  * This is the maximum virtual address which can be DMA'd from.
@@ -16,6 +10,19 @@ typedef unsigned int dmach_t;
 #define MAX_DMA_ADDRESS	0xffffffff
 #endif
 
+#ifdef CONFIG_ISA_DMA_API
+/*
+ * This is used to support drivers written for the x86 ISA DMA API.
+ * It should not be re-used except for that purpose.
+ */
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <asm/scatterlist.h>
+
+typedef unsigned int dmach_t;
+
+#include <mach/dma.h>
+
 /*
  * DMA modes
  */
@@ -141,4 +148,6 @@ extern int isa_dma_bridge_buggy;
 #define isa_dma_bridge_buggy    (0)
 #endif
 
-#endif /* _ARM_DMA_H */
+#endif /* CONFIG_ISA_DMA_API */
+
+#endif /* __ASM_ARM_DMA_H */

arch/arm/mach-imx/dma.c

@@ -28,10 +28,11 @@
 #include <linux/interrupt.h>
 #include <linux/errno.h>
 
+#include <asm/scatterlist.h>
 #include <asm/system.h>
 #include <asm/irq.h>
 #include <mach/hardware.h>
-#include <asm/dma.h>
+#include <mach/dma.h>
 #include <mach/imx-dma.h>
 
 struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
@@ -138,7 +139,7 @@ imx_dma_setup_sg_base(imx_dmach_t dma_ch,
 int
 imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
 		     unsigned int dma_length, unsigned int dev_addr,
-		     dmamode_t dmamode)
+		     unsigned int dmamode)
 {
 	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];
 
@@ -223,7 +224,7 @@ imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
 int
 imx_dma_setup_sg(imx_dmach_t dma_ch,
 		 struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
-		 unsigned int dev_addr, dmamode_t dmamode)
+		 unsigned int dev_addr, unsigned int dmamode)
 {
 	int res;
 	struct imx_dma_channel *imxdma = &imx_dma_channels[dma_ch];

arch/arm/mach-imx/include/mach/imx-dma.h

@@ -18,7 +18,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include <asm/dma.h>
+#include <mach/dma.h>
 
 #ifndef __ASM_ARCH_IMX_DMA_H
 #define __ASM_ARCH_IMX_DMA_H
@@ -48,7 +48,7 @@ struct imx_dma_channel {
 	void (*irq_handler) (int, void *);
 	void (*err_handler) (int, void *, int errcode);
 	void *data;
-	dmamode_t  dma_mode;
+	unsigned int  dma_mode;
 	struct scatterlist *sg;
 	unsigned int sgbc;
 	unsigned int sgcount;
@@ -66,14 +66,18 @@ extern struct imx_dma_channel imx_dma_channels[IMX_DMA_CHANNELS];
 /* The type to distinguish channel numbers parameter from ordinal int type */
 typedef int imx_dmach_t;
 
+#define DMA_MODE_READ		0
+#define DMA_MODE_WRITE		1
+#define DMA_MODE_MASK		1
+
 int
 imx_dma_setup_single(imx_dmach_t dma_ch, dma_addr_t dma_address,
-		unsigned int dma_length, unsigned int dev_addr, dmamode_t dmamode);
+		unsigned int dma_length, unsigned int dev_addr, unsigned int dmamode);
 
 int
 imx_dma_setup_sg(imx_dmach_t dma_ch,
 		 struct scatterlist *sg, unsigned int sgcount, unsigned int dma_length,
-		 unsigned int dev_addr, dmamode_t dmamode);
+		 unsigned int dev_addr, unsigned int dmamode);
 
 int
 imx_dma_setup_handlers(imx_dmach_t dma_ch,

arch/arm/mach-pnx4008/dma.c

@@ -25,9 +25,8 @@
 
 #include <asm/system.h>
 #include <mach/hardware.h>
-#include <asm/dma.h>
+#include <mach/dma.h>
 #include <asm/dma-mapping.h>
-#include <asm/mach/dma.h>
 #include <mach/clock.h>
 
 static struct dma_channel {

arch/arm/mach-pxa/dma.c

@@ -21,7 +21,7 @@
 #include <asm/system.h>
 #include <asm/irq.h>
 #include <mach/hardware.h>
-#include <asm/dma.h>
+#include <mach/dma.h>
 
 #include <mach/pxa-regs.h>
 

arch/arm/mach-s3c2410/dma.c

@@ -17,7 +17,6 @@
 #include <linux/sysdev.h>
 #include <linux/serial_core.h>
 
-#include <asm/dma.h>
 #include <mach/dma.h>
 
 #include <plat/cpu.h>