include/asm-blackfin/dma.h

   1 /*
   2  * File:         include/asm-blackfin/simple_bf533_dma.h
   3  * Based on:     none - original work
   4  * Author:       LG Soft India
   5  *               Copyright (C) 2004-2005 Analog Devices Inc.
   6  * Created:      Tue Sep 21 2004
   7  * Description:  This file contains the major Data structures and constants
   8  *               used for DMA Implementation in BF533
   9  * Modified:
  10  *
  11  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; see the file COPYING.
  25  * If not, write to the Free Software Foundation,
  26  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 #ifndef _BLACKFIN_DMA_H_
  30 #define _BLACKFIN_DMA_H_
  31
  32 #include <asm/io.h>
  33 #include <linux/slab.h>
  34 #include <asm/irq.h>
  35 #include <asm/signal.h>
  36
  37 #include <linux/kernel.h>
  38 #include <asm/mach/dma.h>
  39 #include <linux/mm.h>
  40 #include <linux/interrupt.h>
  41 #include <asm/blackfin.h>
  42
  43 #define MAX_DMA_ADDRESS PAGE_OFFSET
  44
  45 /*****************************************************************************
  46 *        Generic DMA  Declarations
  47 *
  48 ****************************************************************************/
  49 enum dma_chan_status {
  50         DMA_CHANNEL_FREE,
  51         DMA_CHANNEL_REQUESTED,
  52         DMA_CHANNEL_ENABLED,
  53 };
  54
  55 /*-------------------------
  56  * config reg bits value
  57  *-------------------------*/
  58 #define DATA_SIZE_8             0
  59 #define DATA_SIZE_16            1
  60 #define DATA_SIZE_32            2
  61
  62 #define DMA_FLOW_STOP           0
  63 #define DMA_FLOW_AUTO           1
  64 #define DMA_FLOW_ARRAY          4
  65 #define DMA_FLOW_SMALL          6
  66 #define DMA_FLOW_LARGE          7
  67
  68 #define DIMENSION_LINEAR    0
  69 #define DIMENSION_2D           1
  70
  71 #define DIR_READ     0
  72 #define DIR_WRITE    1
  73
  74 #define INTR_DISABLE   0
  75 #define INTR_ON_BUF    2
  76 #define INTR_ON_ROW    3
  77
  78 #define DMA_NOSYNC_KEEP_DMA_BUF 0
  79 #define DMA_SYNC_RESTART        1
  80
  81 struct dmasg {
  82         unsigned long next_desc_addr;
  83         unsigned long start_addr;
  84         unsigned short cfg;
  85         unsigned short x_count;
  86         short x_modify;
  87         unsigned short y_count;
  88         short y_modify;
  89 } __attribute__((packed));
  90
  91 struct dma_register {
  92         unsigned long next_desc_ptr;    /* DMA Next Descriptor Pointer register */
  93         unsigned long start_addr;       /* DMA Start address  register */
  94
  95         unsigned short cfg;     /* DMA Configuration register */
  96         unsigned short dummy1;  /* DMA Configuration register */
  97
  98         unsigned long reserved;
  99
 100         unsigned short x_count; /* DMA x_count register */
 101         unsigned short dummy2;
 102
 103         short x_modify; /* DMA x_modify register */
 104         unsigned short dummy3;
 105
 106         unsigned short y_count; /* DMA y_count register */
 107         unsigned short dummy4;
 108
 109         short y_modify; /* DMA y_modify register */
 110         unsigned short dummy5;
 111
 112         unsigned long curr_desc_ptr;    /* DMA Current Descriptor Pointer
 113                                            register */
 114         unsigned long curr_addr_ptr;    /* DMA Current Address Pointer
 115                                                    register */
 116         unsigned short irq_status;      /* DMA irq status register */
 117         unsigned short dummy6;
 118
 119         unsigned short peripheral_map;  /* DMA peripheral map register */
 120         unsigned short dummy7;
 121
 122         unsigned short curr_x_count;    /* DMA Current x-count register */
 123         unsigned short dummy8;
 124
 125         unsigned long reserved2;
 126
 127         unsigned short curr_y_count;    /* DMA Current y-count register */
 128         unsigned short dummy9;
 129
 130         unsigned long reserved3;
 131
 132 };
 133
 134 typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
 135
 136 struct dma_channel {
 137         struct mutex dmalock;
 138         char *device_id;
 139         enum dma_chan_status chan_status;
 140         struct dma_register *regs;
 141         struct dmasg *sg;               /* large mode descriptor */
 142         unsigned int ctrl_num;  /* controller number */
 143         dma_interrupt_t irq_callback;
 144         void *data;
 145         unsigned int dma_enable_flag;
 146         unsigned int loopback_flag;
 147 };
 148
 149 /*******************************************************************************
 150 *       DMA API's
 151 *******************************************************************************/
 152 /* functions to set register mode */
 153 void set_dma_start_addr(unsigned int channel, unsigned long addr);
 154 void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
 155 void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr);
 156 void set_dma_x_count(unsigned int channel, unsigned short x_count);
 157 void set_dma_x_modify(unsigned int channel, short x_modify);
 158 void set_dma_y_count(unsigned int channel, unsigned short y_count);
 159 void set_dma_y_modify(unsigned int channel, short y_modify);
 160 void set_dma_config(unsigned int channel, unsigned short config);
 161 unsigned short set_bfin_dma_config(char direction, char flow_mode,
 162                                    char intr_mode, char dma_mode, char width,
 163                                    char syncmode);
 164 void set_dma_curr_addr(unsigned int channel, unsigned long addr);
 165
 166 /* get curr status for polling */
 167 unsigned short get_dma_curr_irqstat(unsigned int channel);
 168 unsigned short get_dma_curr_xcount(unsigned int channel);
 169 unsigned short get_dma_curr_ycount(unsigned int channel);
 170 unsigned long get_dma_next_desc_ptr(unsigned int channel);
 171 unsigned long get_dma_curr_desc_ptr(unsigned int channel);
 172 unsigned long get_dma_curr_addr(unsigned int channel);
 173
 174 /* set large DMA mode descriptor */
 175 void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg);
 176
 177 /* check if current channel is in use */
 178 int dma_channel_active(unsigned int channel);
 179
 180 /* common functions must be called in any mode */
 181 void free_dma(unsigned int channel);
 182 int dma_channel_active(unsigned int channel); /* check if a channel is in use */
 183 void disable_dma(unsigned int channel);
 184 void enable_dma(unsigned int channel);
 185 int request_dma(unsigned int channel, char *device_id);
 186 int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
 187                      void *data);
 188 void dma_disable_irq(unsigned int channel);
 189 void dma_enable_irq(unsigned int channel);
 190 void clear_dma_irqstat(unsigned int channel);
 191 void *dma_memcpy(void *dest, const void *src, size_t count);
 192 void *safe_dma_memcpy(void *dest, const void *src, size_t count);
 193
 194 extern int channel2irq(unsigned int channel);
 195 extern struct dma_register *dma_io_base_addr[MAX_BLACKFIN_DMA_CHANNEL];
 196
 197 #endif