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/*
* arch/arm/mach-pxa/include/mach/dma.h
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_DMA_H
#define __ASM_ARCH_DMA_H
#include <mach/hardware.h>
/* DMA Controller Registers Definitions */
#define DMAC_REGS_VIRT io_p2v(0x40000000)
#define DMAC_REG(x) (*((volatile u32 *)(DMAC_REGS_VIRT + (x))))
#define DCSR(n) DMAC_REG((n) << 2)
#define DALGN DMAC_REG(0x00a0) /* DMA Alignment Register */
#define DINT DMAC_REG(0x00f0) /* DMA Interrupt Register */
#define DDADR(n) DMAC_REG(0x0200 + ((n) << 4))
#define DSADR(n) DMAC_REG(0x0204 + ((n) << 4))
#define DTADR(n) DMAC_REG(0x0208 + ((n) << 4))
#define DCMD(n) DMAC_REG(0x020c + ((n) << 4))
#define DRCMR(n) DMAC_REG((((n) < 64) ? 0x0100 : 0x1100) + \
(((n) & 0x3f) << 2))
#define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */
#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
#define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
#define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */
#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
#define DCSR_EORINTR (1 << 9) /* The end of Receive */
#endif
#define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
#define DDADR_STOP (1 << 0) /* Stop (read / write) */
#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */
#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
/*
* Descriptor structure for PXA's DMA engine
* Note: this structure must always be aligned to a 16-byte boundary.
*/
typedef struct pxa_dma_desc {
volatile u32 ddadr; /* Points to the next descriptor + flags */
volatile u32 dsadr; /* DSADR value for the current transfer */
volatile u32 dtadr; /* DTADR value for the current transfer */
volatile u32 dcmd; /* DCMD value for the current transfer */
} pxa_dma_desc;
typedef enum {
DMA_PRIO_HIGH = 0,
DMA_PRIO_MEDIUM = 1,
DMA_PRIO_LOW = 2
} pxa_dma_prio;
/*
* DMA registration
*/
int __init pxa_init_dma(int irq, int num_ch);
int pxa_request_dma (char *name,
pxa_dma_prio prio,
void (*irq_handler)(int, void *),
void *data);
void pxa_free_dma (int dma_ch);
#endif /* _ASM_ARCH_DMA_H */
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