1/*
2 *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/time.h>
23#include <sound/core.h>
24#include <sound/gus.h>
25#include <sound/info.h>
26
27
28static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
29			     unsigned int address, unsigned int size)
30{
31	unsigned long flags;
32	unsigned int size1, size2;
33	char buffer[256], *pbuffer;
34
35	while (size > 0) {
36		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
37		if (copy_from_user(buffer, _buffer, size1))
38			return -EFAULT;
39		if (gus->interwave) {
40			spin_lock_irqsave(&gus->reg_lock, flags);
41			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
42			snd_gf1_dram_addr(gus, address);
43			outsb(GUSP(gus, DRAM), buffer, size1);
44			spin_unlock_irqrestore(&gus->reg_lock, flags);
45			address += size1;
46		} else {
47			pbuffer = buffer;
48			size2 = size1;
49			while (size2--)
50				snd_gf1_poke(gus, address++, *pbuffer++);
51		}
52		size -= size1;
53		_buffer += size1;
54	}
55	return 0;
56}
57
58
59int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
60		       unsigned int address, unsigned int size)
61{
62	return snd_gus_dram_poke(gus, buffer, address, size);
63}
64
65static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
66			     unsigned int address, unsigned int size,
67			     int rom)
68{
69	unsigned long flags;
70	unsigned int size1, size2;
71	char buffer[256], *pbuffer;
72
73	while (size > 0) {
74		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
75		if (gus->interwave) {
76			spin_lock_irqsave(&gus->reg_lock, flags);
77			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
78			snd_gf1_dram_addr(gus, address);
79			insb(GUSP(gus, DRAM), buffer, size1);
80			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
81			spin_unlock_irqrestore(&gus->reg_lock, flags);
82			address += size1;
83		} else {
84			pbuffer = buffer;
85			size2 = size1;
86			while (size2--)
87				*pbuffer++ = snd_gf1_peek(gus, address++);
88		}
89		if (copy_to_user(_buffer, buffer, size1))
90			return -EFAULT;
91		size -= size1;
92		_buffer += size1;
93	}
94	return 0;
95}
96
97int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
98		      unsigned int address, unsigned int size,
99		      int rom)
100{
101	return snd_gus_dram_peek(gus, buffer, address, size, rom);
102}
103