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dma.h

/*
 * File:         include/asm-blackfin/simple_bf533_dma.h
 * Based on:     none - original work
 * Author:       LG Soft India
 *               Copyright (C) 2004-2005 Analog Devices Inc.
 * Created:      Tue Sep 21 2004
 * Description:  This file contains the major Data structures and constants
 *           used for DMA Implementation in BF533
 * Modified:
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#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;
      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 */
      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, 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_BLACKFIN_DMA_CHANNEL];

#endif

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