include/asm/dma.h

1 /* SPDX-License-Identifier: GPL-2.0 */
20 ** DMA_CHUNK_SIZE is used by the SCSI mid-layer to break up
34 ** We don't have DMA channels... well V-class does but the
36 ** Note: this is not relevant right now for PA-RISC, but we cannot
38 ** won't compile :-(
41 #define DMA_MODE_READ	0x44	/* I/O to memory, no autoinit, increment, single mode */
42 #define DMA_MODE_WRITE	0x48	/* memory to I/O, no autoinit, increment, single mode */
43 #define DMA_MODE_CASCADE 0xC0	/* pass thru DREQ->HRQ, DACK<-HLDA only */
49 #define IO_DMA2_BASE	0xC0	/* 16 bit master DMA, ch 4(=slave input)..7 */
55 #define DMA1_MASK_REG		0x0A	/* single-channel mask (w) */
57 #define DMA1_CLEAR_FF_REG	0x0C	/* clear pointer flip-flop (w) */
59 #define DMA1_RESET_REG		0x0D	/* Master Clear (w) */
61 #define DMA1_MASK_ALL_REG       0x0F    /* all-channels mask (w) */
67 #define DMA2_MASK_REG		0xD4	/* single-channel mask (w) */
69 #define DMA2_CLEAR_FF_REG	0xD8	/* clear pointer flip-flop (w) */
71 #define DMA2_RESET_REG		0xDA	/* Master Clear (w) */
73 #define DMA2_MASK_ALL_REG       0xDE    /* all-channels mask (w) */
92  * Assumes DMA flip-flop is clear.
99 	/* using short to get 16-bit wrap around */  in get_dma_residue()
135  * After that, keep track of it. :-)
136  * --- In order to do that, the DMA routines below should ---
137  * --- only be used while holding the DMA lock ! ---
171  * Assumes dma flip-flop is clear.
172  * NOTE 2: "count" represents _bytes_ and must be even for channels 5-7.