aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-blackfin/dma.h
blob: be0d913e5516271b240d1c691c074344bfc6cf36 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
/*
 * 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 <asm/semaphore.h>

#include <linux/kernel.h>
#include <asm/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

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 short curr_addr_ptr_lo;	/* DMA Current Address Pointer
						   register */
	unsigned short curr_addr_ptr_hi;	/* 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;
};

/*******************************************************************************
*	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_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);

/* 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);

/* 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);

#endif