2 * linux/include/asm-arm/arch-sa1100/dma.h
4 * Generic SA1100 DMA support
6 * Copyright (C) 2000 Nicolas Pitre
10 #ifndef __ASM_ARCH_DMA_H
11 #define __ASM_ARCH_DMA_H
17 * The SA1100 has six internal DMA channels.
19 #define SA1100_DMA_CHANNELS 6
22 * Maximum physical DMA buffer size
24 #define MAX_DMA_SIZE 0x1fff
25 #define CUT_DMA_SIZE 0x1000
28 * All possible SA1100 devices a DMA channel can be attached to.
31 DMA_Ser0UDCWr = DDAR_Ser0UDCWr, /* Ser. port 0 UDC Write */
32 DMA_Ser0UDCRd = DDAR_Ser0UDCRd, /* Ser. port 0 UDC Read */
33 DMA_Ser1UARTWr = DDAR_Ser1UARTWr, /* Ser. port 1 UART Write */
34 DMA_Ser1UARTRd = DDAR_Ser1UARTRd, /* Ser. port 1 UART Read */
35 DMA_Ser1SDLCWr = DDAR_Ser1SDLCWr, /* Ser. port 1 SDLC Write */
36 DMA_Ser1SDLCRd = DDAR_Ser1SDLCRd, /* Ser. port 1 SDLC Read */
37 DMA_Ser2UARTWr = DDAR_Ser2UARTWr, /* Ser. port 2 UART Write */
38 DMA_Ser2UARTRd = DDAR_Ser2UARTRd, /* Ser. port 2 UART Read */
39 DMA_Ser2HSSPWr = DDAR_Ser2HSSPWr, /* Ser. port 2 HSSP Write */
40 DMA_Ser2HSSPRd = DDAR_Ser2HSSPRd, /* Ser. port 2 HSSP Read */
41 DMA_Ser3UARTWr = DDAR_Ser3UARTWr, /* Ser. port 3 UART Write */
42 DMA_Ser3UARTRd = DDAR_Ser3UARTRd, /* Ser. port 3 UART Read */
43 DMA_Ser4MCP0Wr = DDAR_Ser4MCP0Wr, /* Ser. port 4 MCP 0 Write (audio) */
44 DMA_Ser4MCP0Rd = DDAR_Ser4MCP0Rd, /* Ser. port 4 MCP 0 Read (audio) */
45 DMA_Ser4MCP1Wr = DDAR_Ser4MCP1Wr, /* Ser. port 4 MCP 1 Write */
46 DMA_Ser4MCP1Rd = DDAR_Ser4MCP1Rd, /* Ser. port 4 MCP 1 Read */
47 DMA_Ser4SSPWr = DDAR_Ser4SSPWr, /* Ser. port 4 SSP Write (16 bits) */
48 DMA_Ser4SSPRd = DDAR_Ser4SSPRd /* Ser. port 4 SSP Read (16 bits) */
53 volatile u_long SetDCSR;
54 volatile u_long ClrDCSR;
55 volatile u_long RdDCSR;
56 volatile dma_addr_t DBSA;
58 volatile dma_addr_t DBSB;
62 typedef void (*dma_callback_t)(void *data);
65 * DMA function prototypes
68 extern int sa1100_request_dma( dma_device_t device, const char *device_id,
69 dma_callback_t callback, void *data,
71 extern void sa1100_free_dma( dma_regs_t *regs );
72 extern int sa1100_start_dma( dma_regs_t *regs, dma_addr_t dma_ptr, u_int size );
73 extern dma_addr_t sa1100_get_dma_pos(dma_regs_t *regs);
74 extern void sa1100_reset_dma(dma_regs_t *regs);
77 * sa1100_stop_dma - stop DMA in progress
78 * @regs: identifier for the channel to use
80 * This stops DMA without clearing buffer pointers. Unlike
81 * sa1100_clear_dma() this allows subsequent use of sa1100_resume_dma()
82 * or sa1100_get_dma_pos().
84 * The @regs identifier is provided by a successful call to
85 * sa1100_request_dma().
88 #define sa1100_stop_dma(regs) ((regs)->ClrDCSR = DCSR_IE|DCSR_RUN)
91 * sa1100_resume_dma - resume DMA on a stopped channel
92 * @regs: identifier for the channel to use
94 * This resumes DMA on a channel previously stopped with
97 * The @regs identifier is provided by a successful call to
98 * sa1100_request_dma().
101 #define sa1100_resume_dma(regs) ((regs)->SetDCSR = DCSR_IE|DCSR_RUN)
104 * sa1100_clear_dma - clear DMA pointers
105 * @regs: identifier for the channel to use
107 * This clear any DMA state so the DMA engine is ready to restart
108 * with new buffers through sa1100_start_dma(). Any buffers in flight
111 * The @regs identifier is provided by a successful call to
112 * sa1100_request_dma().
115 #define sa1100_clear_dma(regs) ((regs)->ClrDCSR = DCSR_IE|DCSR_RUN|DCSR_STRTA|DCSR_STRTB)
117 #endif /* _ASM_ARCH_DMA_H */