Fix a name clash between Snes9x's dma.h and the DS2 dma.h by renaming the DS2 dma.h to ds2_dma.h.

Add preliminary support for drawing emulated screens with DS2 DMA.

1 files changed, 34 insertions, 104 deletions

diff --git a/sdk-modifications/include/ds2_dma.h b/sdk-modifications/include/ds2_dma.h
index c7cd267..491df0e 100644
--- a/sdk-modifications/include/ds2_dma.h
+++ b/sdk-modifications/include/ds2_dma.h
@@ -1,120 +1,50 @@
-#ifndef _DS2_DMA_H__
-#define _DS2_DMA_H__
+#ifndef __DMA_H__
+#define __DMA_H__
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-
-#define MAX_DMA_NUM 6  /* max 6 channels */
-
-
-// DMA request source register
-#define DMAC_DRSR_RS_BIT    0
-#define DMAC_DRSR_RS_AUTO (8 << DMAC_DRSR_RS_BIT)
-
-
-// DMA channel command register
-#define DMAC_DCMD_SAI       (1 << 23) /* source address increment */
-#define DMAC_DCMD_DAI       (1 << 22) /* dest address increment */
-
-#define DMAC_DCMD_SWDH_BIT  14  /* source port width */
-#define DMAC_DCMD_SWDH_32 (0 << DMAC_DCMD_SWDH_BIT)
-#define DMAC_DCMD_SWDH_8  (1 << DMAC_DCMD_SWDH_BIT)
-#define DMAC_DCMD_SWDH_16 (2 << DMAC_DCMD_SWDH_BIT)
-
-#define DMAC_DCMD_DWDH_BIT  12  /* dest port width */
-#define DMAC_DCMD_DWDH_32 (0 << DMAC_DCMD_DWDH_BIT)
-#define DMAC_DCMD_DWDH_8  (1 << DMAC_DCMD_DWDH_BIT)
- #define DMAC_DCMD_DWDH_16 (2 << DMAC_DCMD_DWDH_BIT)
-
-#define DMAC_DCMD_DS_BIT    8  /* transfer data size of a data unit */
-#define DMAC_DCMD_DS_32BIT    (0 << DMAC_DCMD_DS_BIT)
-#define DMAC_DCMD_DS_8BIT (1 << DMAC_DCMD_DS_BIT)
-#define DMAC_DCMD_DS_16BIT    (2 << DMAC_DCMD_DS_BIT)
-#define DMAC_DCMD_DS_16BYTE   (3 << DMAC_DCMD_DS_BIT)
-#define DMAC_DCMD_DS_32BYTE   (4 << DMAC_DCMD_DS_BIT)
-
-#define DMAC_DCMD_TM        (1 << 7)  /* transfer mode: 0-single 1-block */
-
-
-//detect if channel has completed job
-#define DMAC_DCCSR_TT   (1 << 3)  /* transfer terminated */
-#define DMAC_BASE 0xB3020000
-#define REG32(addr) *((volatile u32 *)(addr))
-#define DMAC_DCCSR(n) (DMAC_BASE + (0x10 + (n) * 0x20)) /* DMA control/status */
-#define REG_DMAC_DCCSR(n) REG32(DMAC_DCCSR((n)))
-
-#define ds2_DMA_isBusy(n) \
-  !(  REG_DMAC_DCCSR((n)) & DMAC_DCCSR_TT )
-
-
-/*
-Copy modes
-
-*/
-
-#define DMA_MODE32BYTE DMAC_DCMD_SWDH_32 | DMAC_DCMD_DWDH_32 | \
-                   DMAC_DCMD_DS_32BYTE | DMAC_DCMD_TM
-
-#define DMA_MODE16BYTE DMAC_DCMD_SWDH_16 | DMAC_DCMD_DWDH_16 | \
-                   DMAC_DCMD_DS_16BYTE | DMAC_DCMD_TM
-
-#define DMA_MODE32BIT DMAC_DCMD_SWDH_32 | DMAC_DCMD_DWDH_32 | \
-                   DMAC_DCMD_DS_32BIT
-
-#define DMA_MODE16BIT DMAC_DCMD_SWDH_16 | DMAC_DCMD_DWDH_16 | \
-                   DMAC_DCMD_DS_16BIT
-
-#define DMA_MODE8BIT DMAC_DCMD_SWDH_8 | DMAC_DCMD_DWDH_8 | \
-                   DMAC_DCMD_DS_8BIT | DMAC_DCMD_TM
-
-#define DMA_MODECOPY DMAC_DCMD_SAI
-
-
-
-extern int _dmaCopy(int ch, void *dest, void *src, unsigned int size, unsigned int flags);
-
-//copy from 32 bit source to 32 bit dest
-//data must be 32 byte aligned
-#define ds2_DMAcopy_32Byte(ch, dest, src, size)\
-  _dmaCopy(ch, dest, src, size, DMA_MODECOPY | DMA_MODE32BYTE)
-
-//copy from 16 bit source to 16 bit dest
-//data must be 16 byte aligned
-#define ds2_DMAcopy_16Byte(ch, dest, src, size)\
-  _dmaCopy(ch, dest, src, size, DMA_MODECOPY | DMA_MODE16BYTE);
-
-//copy from 32 bit source to 32 bit dest
-//data must be 32 bit aligned
-#define ds2_DMAcopy_32Bit(ch, dest, src, size)\
-  _dmaCopy(ch, dest, src, size, DMA_MODECOPY | DMA_MODE32BIT);
-
-//copy from 16 bit source to 16 bit dest
-//data must be 16 bit aligned
-#define ds2_DMAcopy_16Bit(ch, dest, src, size)\
-  _dmaCopy(ch, dest, src, size, DMA_MODECOPY | DMA_MODE16BIT)
-
-//copy from 8 bit source to 8 bit dest
-//data must be 8 bit aligned
-#define ds2_DMAcopy_8Bit(ch, dest, src, size)\
-  _dmaCopy(ch, dest, src, size, DMA_MODECOPY | DMA_MODE8BIT)
-
-
+//register a DMA transfer request
+//ch: channel id request, there are 6 channles, 
+//irq_handler: the DMA interruption handle
+//arg: argument to the handle
+//mode: DMA mode, such as port width, address increased/fixed, and so on
+//type: DMA request type
+extern int dma_request(int ch, void (*irq_handler)(unsigned int), unsigned int arg,
+		 unsigned int mode, unsigned int type);
+
+//start DMA transfer, must request a DMA first
+//ch: channel id
+//srcAddr: DMA source address
+//dstAddr: DMA destination address
+//count: DMA transfer count, the total bytes due the mode in dma_request
+extern void dma_start(int ch, unsigned int srcAddr, unsigned int dstAddr,
+	       unsigned int count);
 
 //Stop DMA transfer
 extern void dma_stop(int ch);
 
-#define ds2_DMA_stop(ch)\
-  dma_stop(ch)
-
 //Wait DMA transfer over
 extern int dma_wait_finish(int ch);
 
-#define ds2_DMA_wait(ch)\
-  dma_wait_finish(ch)
-
 
+/*
+ * Copy 'size' bytes from src to dest, in blocks of 32 bytes.
+ * size is in bytes and must be a multiple of 32.
+ * Both src and dest must be aligned to 32 bytes.
+ * Returns 0 on failure, non-zero on success.
+ */
+extern int dma_copy32Byte(int ch, void *dest, void *src, unsigned int size);
+// Blocks of 16 bytes, aligned to 16 bytes
+extern int dma_copy16Byte(int ch, void *dest, void *src, unsigned int size);
+// Blocks of 4 bytes, aligned to 4 bytes
+extern int dma_copy32Bit(int ch, void *dest, void *src, unsigned int size);
+// Blocks of 2 bytes, aligned to 2 bytes
+extern int dma_copy16Bit(int ch, void *dest, void *src, unsigned int size);
+extern int dma_isBusy(int ch);
+extern int dma_isFree(int ch);
+extern int dma_getFree(void);
 
 #ifdef __cplusplus
 }