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
11 * Bugs: Enter bugs at http://blackfin.uclinux.org/
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)
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.
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.
29 #ifndef _BLACKFIN_DMA_H_
30 #define _BLACKFIN_DMA_H_
33 #include <linux/slab.h>
35 #include <asm/signal.h>
36 #include <asm/semaphore.h>
38 #include <linux/kernel.h>
39 #include <asm/mach/dma.h>
41 #include <linux/interrupt.h>
42 #include <asm/blackfin.h>
44 #define MAX_DMA_ADDRESS PAGE_OFFSET
46 /*****************************************************************************
47 * Generic DMA Declarations
49 ****************************************************************************/
50 enum dma_chan_status
{
52 DMA_CHANNEL_REQUESTED
,
56 /*-------------------------
57 * config reg bits value
58 *-------------------------*/
60 #define DATA_SIZE_16 1
61 #define DATA_SIZE_32 2
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
69 #define DIMENSION_LINEAR 0
70 #define DIMENSION_2D 1
75 #define INTR_DISABLE 0
80 unsigned long next_desc_addr
;
81 unsigned long start_addr
;
83 unsigned short x_count
;
85 unsigned short y_count
;
87 } __attribute__((packed
));
90 unsigned long next_desc_ptr
; /* DMA Next Descriptor Pointer register */
91 unsigned long start_addr
; /* DMA Start address register */
93 unsigned short cfg
; /* DMA Configuration register */
94 unsigned short dummy1
; /* DMA Configuration register */
96 unsigned long reserved
;
98 unsigned short x_count
; /* DMA x_count register */
99 unsigned short dummy2
;
101 short x_modify
; /* DMA x_modify register */
102 unsigned short dummy3
;
104 unsigned short y_count
; /* DMA y_count register */
105 unsigned short dummy4
;
107 short y_modify
; /* DMA y_modify register */
108 unsigned short dummy5
;
110 unsigned long curr_desc_ptr
; /* DMA Current Descriptor Pointer
112 unsigned short curr_addr_ptr_lo
; /* DMA Current Address Pointer
114 unsigned short curr_addr_ptr_hi
; /* DMA Current Address Pointer
116 unsigned short irq_status
; /* DMA irq status register */
117 unsigned short dummy6
;
119 unsigned short peripheral_map
; /* DMA peripheral map register */
120 unsigned short dummy7
;
122 unsigned short curr_x_count
; /* DMA Current x-count register */
123 unsigned short dummy8
;
125 unsigned long reserved2
;
127 unsigned short curr_y_count
; /* DMA Current y-count register */
128 unsigned short dummy9
;
130 unsigned long reserved3
;
134 typedef irqreturn_t(*dma_interrupt_t
) (int irq
, void *dev_id
);
137 struct mutex dmalock
;
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
;
145 unsigned int dma_enable_flag
;
146 unsigned int loopback_flag
;
149 /*******************************************************************************
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 void set_dma_curr_addr(unsigned int channel
, unsigned long addr
);
165 /* get curr status for polling */
166 unsigned short get_dma_curr_irqstat(unsigned int channel
);
167 unsigned short get_dma_curr_xcount(unsigned int channel
);
168 unsigned short get_dma_curr_ycount(unsigned int channel
);
170 /* set large DMA mode descriptor */
171 void set_dma_sg(unsigned int channel
, struct dmasg
*sg
, int nr_sg
);
173 /* check if current channel is in use */
174 int dma_channel_active(unsigned int channel
);
176 /* common functions must be called in any mode */
177 void free_dma(unsigned int channel
);
178 int dma_channel_active(unsigned int channel
); /* check if a channel is in use */
179 void disable_dma(unsigned int channel
);
180 void enable_dma(unsigned int channel
);
181 int request_dma(unsigned int channel
, char *device_id
);
182 int set_dma_callback(unsigned int channel
, dma_interrupt_t callback
,
184 void dma_disable_irq(unsigned int channel
);
185 void dma_enable_irq(unsigned int channel
);
186 void clear_dma_irqstat(unsigned int channel
);
187 void *dma_memcpy(void *dest
, const void *src
, size_t count
);
188 void *safe_dma_memcpy(void *dest
, const void *src
, size_t count
);