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 #include <asm/semaphore.h>
  37
  38 #include <linux/kernel.h>
  39 #include <asm/mach/dma.h>
  40 #include <linux/mm.h>
  41 #include <linux/interrupt.h>
  42 #include <asm/blackfin.h>
  43
  44 #define MAX_DMA_ADDRESS PAGE_OFFSET
  45
  46 /*****************************************************************************
  47 *        Generic DMA  Declarations
  48 *
  49 ****************************************************************************/
  50 enum dma_chan_status {
  51         DMA_CHANNEL_FREE,
  52         DMA_CHANNEL_REQUESTED,
  53         DMA_CHANNEL_ENABLED,
  54 };
  55
  56 /*-------------------------
  57  * config reg bits value
  58  *-------------------------*/
  59 #define DATA_SIZE_8             0
  60 #define DATA_SIZE_16            1
  61 #define DATA_SIZE_32            2
  62
  63 #define DMA_FLOW_STOP           0
  64 #define DMA_FLOW_AUTO           1
  65 #define DMA_FLOW_ARRAY          4
  66 #define DMA_FLOW_SMALL          6
  67 #define DMA_FLOW_LARGE          7
  68
  69 #define DIMENSION_LINEAR    0
  70 #define DIMENSION_2D           1
  71
  72 #define DIR_READ     0
  73 #define DIR_WRITE    1
  74
  75 #define INTR_DISABLE   0
  76 #define INTR_ON_BUF    2
  77 #define INTR_ON_ROW    3
  78
  79 #define DMA_NOSYNC_KEEP_DMA_BUF 0
  80 #define DMA_SYNC_RESTART        1
  81
  82 struct dmasg {
  83         unsigned long next_desc_addr;
  84         unsigned long start_addr;
  85         unsigned short cfg;
  86         unsigned short x_count;
  87         short x_modify;
  88         unsigned short y_count;
  89         short y_modify;
  90 } __attribute__((packed));
  91
  92 struct dma_register {
  93         unsigned long next_desc_ptr;    /* DMA Next Descriptor Pointer register */
  94         unsigned long start_addr;       /* DMA Start address  register */
  95
  96         unsigned short cfg;     /* DMA Configuration register */
  97         unsigned short dummy1;  /* DMA Configuration register */
  98
  99         unsigned long reserved;
 100
 101         unsigned short x_count; /* DMA x_count register */
 102         unsigned short dummy2;
 103
 104         short x_modify; /* DMA x_modify register */
 105         unsigned short dummy3;
 106
 107         unsigned short y_count; /* DMA y_count register */
 108         unsigned short dummy4;
 109
 110         short y_modify; /* DMA y_modify register */
 111         unsigned short dummy5;
 112
 113         unsigned long curr_desc_ptr;    /* DMA Current Descriptor Pointer
 114                                            register */
 115         unsigned long curr_addr_ptr;    /* DMA Current Address Pointer
 116                                                    register */
 117         unsigned short irq_status;      /* DMA irq status register */
 118         unsigned short dummy6;
 119
 120         unsigned short peripheral_map;  /* DMA peripheral map register */
 121         unsigned short dummy7;
 122
 123         unsigned short curr_x_count;    /* DMA Current x-count register */
 124         unsigned short dummy8;
 125
 126         unsigned long reserved2;
 127
 128         unsigned short curr_y_count;    /* DMA Current y-count register */
 129         unsigned short dummy9;
 130
 131         unsigned long reserved3;
 132
 133 };
 134
 135 typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
 136
 137 struct dma_channel {
 138         struct mutex dmalock;
 139         char *device_id;
 140         enum dma_chan_status chan_status;
 141         struct dma_register *regs;
 142         struct dmasg *sg;               /* large mode descriptor */
 143         unsigned int ctrl_num;  /* controller number */
 144         dma_interrupt_t irq_callback;
 145         void *data;
 146         unsigned int dma_enable_flag;
 147         unsigned int loopback_flag;
 148 };
 149
 150 /*******************************************************************************
 151 *       DMA API's
 152 *******************************************************************************/
 153 /* functions to set register mode */
 154 void set_dma_start_addr(unsigned int channel, unsigned long addr);
 155 void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
 156 void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr);
 157 void set_dma_x_count(unsigned int channel, unsigned short x_count);
 158 void set_dma_x_modify(unsigned int channel, short x_modify);
 159 void set_dma_y_count(unsigned int channel, unsigned short y_count);
 160 void set_dma_y_modify(unsigned int channel, short y_modify);
 161 void set_dma_config(unsigned int channel, unsigned short config);
 162 unsigned short set_bfin_dma_config(char direction, char flow_mode,
 163                                    char intr_mode, char dma_mode, char width,
 164                                    char syncmode);
 165 void set_dma_curr_addr(unsigned int channel, unsigned long addr);
 166
 167 /* get curr status for polling */
 168 unsigned short get_dma_curr_irqstat(unsigned int channel);
 169 unsigned short get_dma_curr_xcount(unsigned int channel);
 170 unsigned short get_dma_curr_ycount(unsigned int channel);
 171 unsigned long get_dma_next_desc_ptr(unsigned int channel);
 172 unsigned long get_dma_curr_desc_ptr(unsigned int channel);
 173 unsigned long get_dma_curr_addr(unsigned int channel);
 174
 175 /* set large DMA mode descriptor */
 176 void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg);
 177
 178 /* check if current channel is in use */
 179 int dma_channel_active(unsigned int channel);
 180
 181 /* common functions must be called in any mode */
 182 void free_dma(unsigned int channel);
 183 int dma_channel_active(unsigned int channel); /* check if a channel is in use */
 184 void disable_dma(unsigned int channel);
 185 void enable_dma(unsigned int channel);
 186 int request_dma(unsigned int channel, char *device_id);
 187 int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
 188                      void *data);
 189 void dma_disable_irq(unsigned int channel);
 190 void dma_enable_irq(unsigned int channel);
 191 void clear_dma_irqstat(unsigned int channel);
 192 void *dma_memcpy(void *dest, const void *src, size_t count);
 193 void *safe_dma_memcpy(void *dest, const void *src, size_t count);
 194
 195 #endif