/* dma.h: FRV DMA controller management
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/

#ifndef _ASM_DMA_H
#define _ASM_DMA_H

//#define DMA_DEBUG 1

#include <linux/interrupt.h>

#undef MAX_DMA_CHANNELS /* don't use kernel/dma.c */

/* under 2.4 this is actually needed by the new bootmem allocator */
#define MAX_DMA_ADDRESS PAGE_OFFSET

/*
* FRV DMA controller management
*/
typedef irqreturn_t (*dma_irq_handler_t)(int dmachan, unsigned long cstr, void *data);

extern void frv_dma_init(void);

extern int frv_dma_open(const char *devname,
unsigned long dmamask,
int dmacap,
dma_irq_handler_t handler,
unsigned long irq_flags,
void *data);

/* channels required */
#define FRV_DMA_MASK_ANY ULONG_MAX /* any channel */

/* capabilities required */
#define FRV_DMA_CAP_DREQ 0x01 /* DMA request pin */
#define FRV_DMA_CAP_DACK 0x02 /* DMA ACK pin */
#define FRV_DMA_CAP_DONE 0x04 /* DMA done pin */

extern void frv_dma_close(int dma);

extern void frv_dma_config(int dma, unsigned long ccfr, unsigned long cctr, unsigned long apr);

extern void frv_dma_start(int dma,
unsigned long sba, unsigned long dba,
unsigned long pix, unsigned long six, unsigned long bcl);

extern void frv_dma_restart_circular(int dma, unsigned long six);

extern void frv_dma_stop(int dma);

extern int is_frv_dma_interrupting(int dma);

extern void frv_dma_dump(int dma);

extern void frv_dma_status_clear(int dma);

#define FRV_DMA_NCHANS 8
#define FRV_DMA_4CHANS 4
#define FRV_DMA_8CHANS 8

#define DMAC_CCFRx 0x00 /* channel configuration reg */
#define DMAC_CCFRx_CM_SHIFT 16
#define DMAC_CCFRx_CM_DA 0x00000000
#define DMAC_CCFRx_CM_SCA 0x00010000
#define DMAC_CCFRx_CM_DCA 0x00020000
#define DMAC_CCFRx_CM_2D 0x00030000
#define DMAC_CCFRx_ATS_SHIFT 8
#define DMAC_CCFRx_RS_INTERN 0x00000000
#define DMAC_CCFRx_RS_EXTERN 0x00000001
#define DMAC_CCFRx_RS_SHIFT 0

#define DMAC_CSTRx 0x08 /* channel status reg */
#define DMAC_CSTRx_FS 0x0000003f
#define DMAC_CSTRx_NE 0x00000100
#define DMAC_CSTRx_FED 0x00000200
#define DMAC_CSTRx_WER 0x00000800
#define DMAC_CSTRx_RER 0x00001000
#define DMAC_CSTRx_CE 0x00002000
#define DMAC_CSTRx_INT 0x00800000
#define DMAC_CSTRx_BUSY 0x80000000

#define DMAC_CCTRx 0x10 /* channel control reg */
#define DMAC_CCTRx_DSIZ_1 0x00000000
#define DMAC_CCTRx_DSIZ_2 0x00000001
#define DMAC_CCTRx_DSIZ_4 0x00000002
#define DMAC_CCTRx_DSIZ_32 0x00000005
#define DMAC_CCTRx_DAU_HOLD 0x00000000
#define DMAC_CCTRx_DAU_INC 0x00000010
#define DMAC_CCTRx_DAU_DEC 0x00000020
#define DMAC_CCTRx_SSIZ_1 0x00000000
#define DMAC_CCTRx_SSIZ_2 0x00000100
#define DMAC_CCTRx_SSIZ_4 0x00000200
#define DMAC_CCTRx_SSIZ_32 0x00000500
#define DMAC_CCTRx_SAU_HOLD 0x00000000
#define DMAC_CCTRx_SAU_INC 0x00001000
#define DMAC_CCTRx_SAU_DEC 0x00002000
#define DMAC_CCTRx_FC 0x08000000
#define DMAC_CCTRx_ICE 0x10000000
#define DMAC_CCTRx_IE 0x40000000
#define DMAC_CCTRx_ACT 0x80000000

#define DMAC_SBAx 0x18 /* source base address reg */
#define DMAC_DBAx 0x20 /* data base address reg */
#define DMAC_PIXx 0x28 /* primary index reg */
#define DMAC_SIXx 0x30 /* secondary index reg */
#define DMAC_BCLx 0x38 /* byte count limit reg */
#define DMAC_APRx 0x40 /* alternate pointer reg */

/*
* required for PCI + MODULES
*/
#ifdef CONFIG_PCI
extern int isa_dma_bridge_buggy;
#else
#define isa_dma_bridge_buggy (0)
#endif

#endif /* _ASM_DMA_H */