22120b868b5c35bc1a77831c9797c6964a71b598
[linux-2.6.git] / sound / isa / gus / gus_dram.c
1 /*
2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3  *  DRAM access routines
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <sound/driver.h>
23 #include <linux/time.h>
24 #include <sound/core.h>
25 #include <sound/gus.h>
26 #include <sound/info.h>
27
28
29 static int snd_gus_dram_poke(snd_gus_card_t *gus, char __user *_buffer,
30                              unsigned int address, unsigned int size)
31 {
32         unsigned long flags;
33         unsigned int size1, size2;
34         char buffer[256], *pbuffer;
35
36         while (size > 0) {
37                 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
38                 if (copy_from_user(buffer, _buffer, size1))
39                         return -EFAULT;
40                 if (gus->interwave) {
41                         spin_lock_irqsave(&gus->reg_lock, flags);
42                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
43                         snd_gf1_dram_addr(gus, address);
44                         outsb(GUSP(gus, DRAM), buffer, size1);
45                         spin_unlock_irqrestore(&gus->reg_lock, flags);
46                         address += size1;
47                 } else {
48                         pbuffer = buffer;
49                         size2 = size1;
50                         while (size2--)
51                                 snd_gf1_poke(gus, address++, *pbuffer++);
52                 }
53                 size -= size1;
54                 _buffer += size1;
55         }
56         return 0;
57 }
58
59
60 int snd_gus_dram_write(snd_gus_card_t *gus, char __user *buffer,
61                        unsigned int address, unsigned int size)
62 {
63         return snd_gus_dram_poke(gus, buffer, address, size);
64 }
65
66 static int snd_gus_dram_peek(snd_gus_card_t *gus, char __user *_buffer,
67                              unsigned int address, unsigned int size,
68                              int rom)
69 {
70         unsigned long flags;
71         unsigned int size1, size2;
72         char buffer[256], *pbuffer;
73
74         while (size > 0) {
75                 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
76                 if (gus->interwave) {
77                         spin_lock_irqsave(&gus->reg_lock, flags);
78                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
79                         snd_gf1_dram_addr(gus, address);
80                         insb(GUSP(gus, DRAM), buffer, size1);
81                         snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
82                         spin_unlock_irqrestore(&gus->reg_lock, flags);
83                         address += size1;
84                 } else {
85                         pbuffer = buffer;
86                         size2 = size1;
87                         while (size2--)
88                                 *pbuffer++ = snd_gf1_peek(gus, address++);
89                 }
90                 if (copy_to_user(_buffer, buffer, size1))
91                         return -EFAULT;
92                 size -= size1;
93                 _buffer += size1;
94         }
95         return 0;
96 }
97
98 int snd_gus_dram_read(snd_gus_card_t *gus, char __user *buffer,
99                       unsigned int address, unsigned int size,
100                       int rom)
101 {
102         return snd_gus_dram_peek(gus, buffer, address, size, rom);
103 }