mirror of https://gitee.com/openkylin/linux.git
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
|
/*
|
||
|
* linux/include/asm-arm/arch-sa1100/dma.h
|
||
|
*
|
||
|
* Generic SA1100 DMA support
|
||
|
*
|
||
|
* Copyright (C) 2000 Nicolas Pitre
|
||
|
*
|
||
|
*/
|
||
|
|
||
|
#ifndef __ASM_ARCH_DMA_H
|
||
|
#define __ASM_ARCH_DMA_H
|
||
|
|
||
|
#include "hardware.h"
|
||
|
|
||
|
|
||
|
/*
|
||
|
* The SA1100 has six internal DMA channels.
|
||
|
*/
|
||
|
#define SA1100_DMA_CHANNELS 6
|
||
|
|
||
|
/*
|
||
|
* Maximum physical DMA buffer size
|
||
|
*/
|
||
|
#define MAX_DMA_SIZE 0x1fff
|
||
|
#define CUT_DMA_SIZE 0x1000
|
||
|
|
||
|
/*
|
||
|
* All possible SA1100 devices a DMA channel can be attached to.
|
||
|
*/
|
||
|
typedef enum {
|
||
|
DMA_Ser0UDCWr = DDAR_Ser0UDCWr, /* Ser. port 0 UDC Write */
|
||
|
DMA_Ser0UDCRd = DDAR_Ser0UDCRd, /* Ser. port 0 UDC Read */
|
||
|
DMA_Ser1UARTWr = DDAR_Ser1UARTWr, /* Ser. port 1 UART Write */
|
||
|
DMA_Ser1UARTRd = DDAR_Ser1UARTRd, /* Ser. port 1 UART Read */
|
||
|
DMA_Ser1SDLCWr = DDAR_Ser1SDLCWr, /* Ser. port 1 SDLC Write */
|
||
|
DMA_Ser1SDLCRd = DDAR_Ser1SDLCRd, /* Ser. port 1 SDLC Read */
|
||
|
DMA_Ser2UARTWr = DDAR_Ser2UARTWr, /* Ser. port 2 UART Write */
|
||
|
DMA_Ser2UARTRd = DDAR_Ser2UARTRd, /* Ser. port 2 UART Read */
|
||
|
DMA_Ser2HSSPWr = DDAR_Ser2HSSPWr, /* Ser. port 2 HSSP Write */
|
||
|
DMA_Ser2HSSPRd = DDAR_Ser2HSSPRd, /* Ser. port 2 HSSP Read */
|
||
|
DMA_Ser3UARTWr = DDAR_Ser3UARTWr, /* Ser. port 3 UART Write */
|
||
|
DMA_Ser3UARTRd = DDAR_Ser3UARTRd, /* Ser. port 3 UART Read */
|
||
|
DMA_Ser4MCP0Wr = DDAR_Ser4MCP0Wr, /* Ser. port 4 MCP 0 Write (audio) */
|
||
|
DMA_Ser4MCP0Rd = DDAR_Ser4MCP0Rd, /* Ser. port 4 MCP 0 Read (audio) */
|
||
|
DMA_Ser4MCP1Wr = DDAR_Ser4MCP1Wr, /* Ser. port 4 MCP 1 Write */
|
||
|
DMA_Ser4MCP1Rd = DDAR_Ser4MCP1Rd, /* Ser. port 4 MCP 1 Read */
|
||
|
DMA_Ser4SSPWr = DDAR_Ser4SSPWr, /* Ser. port 4 SSP Write (16 bits) */
|
||
|
DMA_Ser4SSPRd = DDAR_Ser4SSPRd /* Ser. port 4 SSP Read (16 bits) */
|
||
|
} dma_device_t;
|
||
|
|
||
|
typedef struct {
|
||
|
volatile u_long DDAR;
|
||
|
volatile u_long SetDCSR;
|
||
|
volatile u_long ClrDCSR;
|
||
|
volatile u_long RdDCSR;
|
||
|
volatile dma_addr_t DBSA;
|
||
|
volatile u_long DBTA;
|
||
|
volatile dma_addr_t DBSB;
|
||
|
volatile u_long DBTB;
|
||
|
} dma_regs_t;
|
||
|
|
||
|
typedef void (*dma_callback_t)(void *data);
|
||
|
|
||
|
/*
|
||
|
* DMA function prototypes
|
||
|
*/
|
||
|
|
||
|
extern int sa1100_request_dma( dma_device_t device, const char *device_id,
|
||
|
dma_callback_t callback, void *data,
|
||
|
dma_regs_t **regs );
|
||
|
extern void sa1100_free_dma( dma_regs_t *regs );
|
||
|
extern int sa1100_start_dma( dma_regs_t *regs, dma_addr_t dma_ptr, u_int size );
|
||
|
extern dma_addr_t sa1100_get_dma_pos(dma_regs_t *regs);
|
||
|
extern void sa1100_reset_dma(dma_regs_t *regs);
|
||
|
|
||
|
/**
|
||
|
* sa1100_stop_dma - stop DMA in progress
|
||
|
* @regs: identifier for the channel to use
|
||
|
*
|
||
|
* This stops DMA without clearing buffer pointers. Unlike
|
||
|
* sa1100_clear_dma() this allows subsequent use of sa1100_resume_dma()
|
||
|
* or sa1100_get_dma_pos().
|
||
|
*
|
||
|
* The @regs identifier is provided by a successful call to
|
||
|
* sa1100_request_dma().
|
||
|
**/
|
||
|
|
||
|
#define sa1100_stop_dma(regs) ((regs)->ClrDCSR = DCSR_IE|DCSR_RUN)
|
||
|
|
||
|
/**
|
||
|
* sa1100_resume_dma - resume DMA on a stopped channel
|
||
|
* @regs: identifier for the channel to use
|
||
|
*
|
||
|
* This resumes DMA on a channel previously stopped with
|
||
|
* sa1100_stop_dma().
|
||
|
*
|
||
|
* The @regs identifier is provided by a successful call to
|
||
|
* sa1100_request_dma().
|
||
|
**/
|
||
|
|
||
|
#define sa1100_resume_dma(regs) ((regs)->SetDCSR = DCSR_IE|DCSR_RUN)
|
||
|
|
||
|
/**
|
||
|
* sa1100_clear_dma - clear DMA pointers
|
||
|
* @regs: identifier for the channel to use
|
||
|
*
|
||
|
* This clear any DMA state so the DMA engine is ready to restart
|
||
|
* with new buffers through sa1100_start_dma(). Any buffers in flight
|
||
|
* are discarded.
|
||
|
*
|
||
|
* The @regs identifier is provided by a successful call to
|
||
|
* sa1100_request_dma().
|
||
|
**/
|
||
|
|
||
|
#define sa1100_clear_dma(regs) ((regs)->ClrDCSR = DCSR_IE|DCSR_RUN|DCSR_STRTA|DCSR_STRTB)
|
||
|
|
||
|
#endif /* _ASM_ARCH_DMA_H */
|