[ARM] 4451/1: pxa: make dma.c generic and remove cpu specific dma code

Since the number of dma channels varies between pxa25x and pxa27x, it
introduces some specific code in dma.c. This patch moves the specific
code to pxa25x.c and pxa27x.c and makes dma.c more generic.

1. add pxa_init_dma() for dma initialization, the number of channels
   are passed in by the argument

2. add a "prio" field to the "struct pxa_dma_channel" for the channel
   priority, and is initialized in pxa_init_dma()

3. use a general priority comparison with the channels "prio" field so
   to remove the processor specific pxa_for_each_dma_prio macro,  this
   is not lightning fast as the original one,  but it is acceptable as
   it happens when requesting dma, which is usually not so performance
   critical

Signed-off-by: eric miao <eric.miao@marvell.com>
Acked-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 20 deletions

diff --git a/include/asm-arm/arch-pxa/dma.h b/include/asm-arm/arch-pxa/dma.h
index bed042d71d6..3280ee2ddfa 100644
--- a/include/asm-arm/arch-pxa/dma.h
+++ b/include/asm-arm/arch-pxa/dma.h
@@ -30,30 +30,12 @@ typedef enum {
 	DMA_PRIO_LOW = 2
 } pxa_dma_prio;
 
-#if defined(CONFIG_PXA27x)
-
-#define PXA_DMA_CHANNELS	32
-
-#define pxa_for_each_dma_prio(ch, prio)					\
-for (									\
-	ch = prio * 4;							\
-	ch != (4 << prio) + 16;						\
-	ch = (ch + 1 == (4 << prio)) ? (prio * 4 + 16) : (ch + 1)	\
-)
-
-#elif defined(CONFIG_PXA25x)
-
-#define PXA_DMA_CHANNELS	16
-
-#define pxa_for_each_dma_prio(ch, prio)					\
-	for (ch = prio * 4; ch != (4 << prio); ch++)
-
-#endif
-
 /*
  * DMA registration
  */
 
+int __init pxa_init_dma(int num_ch);
+
 int pxa_request_dma (char *name,
 			 pxa_dma_prio prio,
 			 void (*irq_handler)(int, void *),