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-rw-r--r--include/asm-blackfin/dma.h188
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diff --git a/include/asm-blackfin/dma.h b/include/asm-blackfin/dma.h
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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****************************************************************************/
50enum 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
79struct dmasg {
80 unsigned long next_desc_addr;
81 unsigned long start_addr;
82 unsigned short cfg;
83 unsigned short x_count;
84 short x_modify;
85 unsigned short y_count;
86 short y_modify;
87} __attribute__((packed));
88
89struct dma_register {
90 unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */
91 unsigned long start_addr; /* DMA Start address register */
92
93 unsigned short cfg; /* DMA Configuration register */
94 unsigned short dummy1; /* DMA Configuration register */
95
96 unsigned long reserved;
97
98 unsigned short x_count; /* DMA x_count register */
99 unsigned short dummy2;
100
101 short x_modify; /* DMA x_modify register */
102 unsigned short dummy3;
103
104 unsigned short y_count; /* DMA y_count register */
105 unsigned short dummy4;
106
107 short y_modify; /* DMA y_modify register */
108 unsigned short dummy5;
109
110 unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer
111 register */
112 unsigned short curr_addr_ptr_lo; /* DMA Current Address Pointer
113 register */
114 unsigned short curr_addr_ptr_hi; /* 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
134typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
135
136struct 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 */
153void set_dma_start_addr(unsigned int channel, unsigned long addr);
154void set_dma_next_desc_addr(unsigned int channel, unsigned long addr);
155void set_dma_x_count(unsigned int channel, unsigned short x_count);
156void set_dma_x_modify(unsigned int channel, short x_modify);
157void set_dma_y_count(unsigned int channel, unsigned short y_count);
158void set_dma_y_modify(unsigned int channel, short y_modify);
159void set_dma_config(unsigned int channel, unsigned short config);
160unsigned short set_bfin_dma_config(char direction, char flow_mode,
161 char intr_mode, char dma_mode, char width);
162
163/* get curr status for polling */
164unsigned short get_dma_curr_irqstat(unsigned int channel);
165unsigned short get_dma_curr_xcount(unsigned int channel);
166unsigned short get_dma_curr_ycount(unsigned int channel);
167
168/* set large DMA mode descriptor */
169void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg);
170
171/* check if current channel is in use */
172int dma_channel_active(unsigned int channel);
173
174/* common functions must be called in any mode */
175void free_dma(unsigned int channel);
176int dma_channel_active(unsigned int channel); /* check if a channel is in use */
177void disable_dma(unsigned int channel);
178void enable_dma(unsigned int channel);
179int request_dma(unsigned int channel, char *device_id);
180int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
181 void *data);
182void dma_disable_irq(unsigned int channel);
183void dma_enable_irq(unsigned int channel);
184void clear_dma_irqstat(unsigned int channel);
185void *dma_memcpy(void *dest, const void *src, size_t count);
186void *safe_dma_memcpy(void *dest, const void *src, size_t count);
187
188#endif
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