lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[ARM] dma: make DMA_MODE_xxx reflect ISA DMA settings

Browse Source 
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2009-01-02 12:18:53 +00:00 committed by Russell King
parent 5369bea7d7
commit bc6447b8e4
2 changed files with 9 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/include/asm/dma.h
View File

@ -26,12 +26,15 @@
*/
typedef unsigned int dmamode_t;
#define DMA_MODE_MASK 3
/*
* The DMA modes reflect the settings for the ISA DMA controller
*/
#define DMA_MODE_MASK 0xcc
#define DMA_MODE_READ 0
#define DMA_MODE_WRITE 1
#define DMA_MODE_CASCADE 2
#define DMA_AUTOINIT 4
#define DMA_MODE_READ 0x44
#define DMA_MODE_WRITE 0x48
#define DMA_MODE_CASCADE 0xc0
#define DMA_AUTOINIT 0x10
extern spinlock_t dma_spin_lock;

13
arch/arm/kernel/dma-isa.c
View File

@ -24,11 +24,6 @@
#include <asm/dma.h>
#include <asm/mach/dma.h>
#define ISA_DMA_MODE_READ 0x44
#define ISA_DMA_MODE_WRITE 0x48
#define ISA_DMA_MODE_CASCADE 0xc0
#define ISA_DMA_AUTOINIT 0x10
#define ISA_DMA_MASK 0
#define ISA_DMA_MODE 1
#define ISA_DMA_CLRFF 2
@ -67,20 +62,17 @@ static void isa_enable_dma(unsigned int chan, dma_t *dma)
unsigned int mode;
enum dma_data_direction direction;
mode = chan & 3;
mode = (chan & 3) | dma->dma_mode;
switch (dma->dma_mode & DMA_MODE_MASK) {
case DMA_MODE_READ:
mode |= ISA_DMA_MODE_READ;
direction = DMA_FROM_DEVICE;
break;
case DMA_MODE_WRITE:
mode |= ISA_DMA_MODE_WRITE;
direction = DMA_TO_DEVICE;
break;
case DMA_MODE_CASCADE:
mode |= ISA_DMA_MODE_CASCADE;
direction = DMA_BIDIRECTIONAL;
break;
@ -121,9 +113,6 @@ static void isa_enable_dma(unsigned int chan, dma_t *dma)
outb(length, isa_dma_port[chan][ISA_DMA_COUNT]);
outb(length >> 8, isa_dma_port[chan][ISA_DMA_COUNT]);
if (dma->dma_mode & DMA_AUTOINIT)
mode |= ISA_DMA_AUTOINIT;
outb(mode, isa_dma_port[chan][ISA_DMA_MODE]);
dma->invalid = 0;
}