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/*
* 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 <linux/config.h>
#include "hardware.h"
/*
* This is the maximum DMA address that can be DMAd to.
*/
#define MAX_DMA_ADDRESS 0xffffffff
/*
* The regular generic DMA interface is inappropriate for the
* SA1100 DMA model. None of the SA1100 specific drivers using
* DMA are portable anyway so it's pointless to try to twist the
* regular DMA API to accommodate them.
*/
#define MAX_DMA_CHANNELS 0
/*
* 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 */
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