/*
* dma.h - Blackfin DMA defines/structures/etc...
*
* Copyright 2004-2008 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#ifndef _BLACKFIN_DMA_H_
#define _BLACKFIN_DMA_H_
#include <asm/io.h>
#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/signal.h>
#include <linux/kernel.h>
#include <mach/dma.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <asm/blackfin.h>
#define MAX_DMA_ADDRESS PAGE_OFFSET
/*****************************************************************************
* Generic DMA Declarations
*
****************************************************************************/
enum dma_chan_status {
DMA_CHANNEL_FREE,
DMA_CHANNEL_REQUESTED,
DMA_CHANNEL_ENABLED,
};
/*-------------------------
* config reg bits value
*-------------------------*/
#define DATA_SIZE_8 0
#define DATA_SIZE_16 1
#define DATA_SIZE_32 2
#define DMA_FLOW_STOP 0
#define DMA_FLOW_AUTO 1
#define DMA_FLOW_ARRAY 4
#define DMA_FLOW_SMALL 6
#define DMA_FLOW_LARGE 7
#define DIMENSION_LINEAR 0
#define DIMENSION_2D 1
#define DIR_READ 0
#define DIR_WRITE 1
#define INTR_DISABLE 0
#define INTR_ON_BUF 2
#define INTR_ON_ROW 3
#define DMA_NOSYNC_KEEP_DMA_BUF 0
#define DMA_SYNC_RESTART 1
struct dmasg {
unsigned long next_desc_addr;
unsigned long start_addr;
unsigned short cfg;
unsigned short x_count;
short x_modify;
unsigned short y_count;
short y_modify;
} __attribute__((packed));
struct dma_register {
unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */
unsigned long start_addr; /* DMA Start address register */
unsigned short cfg; /* DMA Configuration register */
unsigned short dummy1; /* DMA Configuration register */
unsigned long reserved;
unsigned short x_count; /* DMA x_count register */
unsigned short dummy2;
short x_modify; /* DMA x_modify register */
unsigned short dummy3;
unsigned short y_count; /* DMA y_count register */
unsigned short dummy4;
short y_modify; /* DMA y_modify register */
unsigned short dummy5;
unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer
register */
unsigned long curr_addr_ptr; /* DMA Current Address Pointer
register */
unsigned short irq_status; /* DMA irq status register */
unsigned short dummy6;
unsigned short peripheral_map; /* DMA peripheral map register */
unsigned short dummy7;
unsigned short curr_x_count; /* DMA Current x-count register */
unsigned short dummy8;
unsigned long reserved2;
unsigned short curr_y_count; /* DMA Current y-count register */
unsigned short dummy9;
unsigned long reserved3;
};
typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
struct dma_channel {
struct mutex dmalock;
const char *device_id;
enum dma_chan_status chan_status;
struct dma_register *regs;
struct dmasg *sg; /* large mode descriptor */
unsigned int ctrl_num; /* controller number */
unsigned int irq;
dma_interrupt_t irq_callback;
void *data;
unsigned int dma_enable_flag;
unsigned int loopback_flag;
#ifdef CONFIG_PM
unsigned short saved_peripheral_map;
#endif
};
#ifdef CONFIG_PM
int blackfin_dma_suspend(void);
void blackfin_dma_resume(void);
#endif
/*******************************************************************************
* DMA API's
*******************************************************************************/
/* functions to set register mode */
void set_dma_start_addr(unsigned int channel, unsigned long addr);
void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr);
void set_dma_x_count(unsigned int channel, unsigned short x_count);
void set_dma_x_modify(unsigned int channel, short x_modify);
void set_dma_y_count(unsigned int channel, unsigned short y_count);
void set_dma_y_modify(unsigned int channel, short y_modify);
void set_dma_config(unsigned int channel, unsigned short config);
unsigned short set_bfin_dma_config(char direction, char flow_mode,
char intr_mode, char dma_mode, char width,
char syncmode);
void set_dma_curr_addr(unsigned int channel, unsigned long addr);
/* get curr status for polling */
unsigned short get_dma_curr_irqstat(unsigned int channel);
unsigned short get_dma_curr_xcount(unsigned int channel);
unsigned short get_dma_curr_ycount(unsigned int channel);
unsigned long get_dma_next_desc_ptr(unsigned int channel);
unsigned long get_dma_curr_desc_ptr(unsigned int channel);
unsigned long get_dma_curr_addr(unsigned int channel);
/* set large DMA mode descriptor */
void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg);
/* check if current channel is in use */
int dma_channel_active(unsigned int channel);
/* common functions must be called in any mode */
void free_dma(unsigned int channel);
int dma_channel_active(unsigned int channel); /* check if a channel is in use */
void disable_dma(unsigned int channel);
void enable_dma(unsigned int channel);
int request_dma(unsigned int channel, const char *device_id);
int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
void *data);
void dma_disable_irq(unsigned int channel);
void dma_enable_irq(unsigned int channel);
void clear_dma_irqstat(unsigned int channel);
void *dma_memcpy(void *dest, const void *src, size_t count);
void *safe_dma_memcpy(void *dest, const void *src, size_t count);
extern int channel2irq(unsigned int channel);
extern struct dma_register *dma_io_base_addr[MAX_DMA_CHANNELS];
#endif
