1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * DRAM access routines
5 */
6
7 #include <linux/time.h>
8 #include <sound/core.h>
9 #include <sound/gus.h>
10 #include <sound/info.h>
11
12
13 static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
14 unsigned int address, unsigned int size)
15 {
16 unsigned long flags;
17 unsigned int size1, size2;
18 char buffer[256], *pbuffer;
19
20 while (size > 0) {
21 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
22 if (copy_from_user(buffer, _buffer, size1))
23 return -EFAULT;
24 if (gus->interwave) {
25 spin_lock_irqsave(&gus->reg_lock, flags);
26 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
27 snd_gf1_dram_addr(gus, address);
28 outsb(GUSP(gus, DRAM), buffer, size1);
29 spin_unlock_irqrestore(&gus->reg_lock, flags);
30 address += size1;
31 } else {
32 pbuffer = buffer;
33 size2 = size1;
34 while (size2--)
35 snd_gf1_poke(gus, address++, *pbuffer++);
36 }
37 size -= size1;
38 _buffer += size1;
39 }
40 return 0;
41 }
42
43
44 int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
45 unsigned int address, unsigned int size)
46 {
47 return snd_gus_dram_poke(gus, buffer, address, size);
48 }
49
50 static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
51 unsigned int address, unsigned int size,
52 int rom)
53 {
54 unsigned long flags;
55 unsigned int size1, size2;
56 char buffer[256], *pbuffer;
57
58 while (size > 0) {
59 size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
60 if (gus->interwave) {
61 spin_lock_irqsave(&gus->reg_lock, flags);
62 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
63 snd_gf1_dram_addr(gus, address);
64 insb(GUSP(gus, DRAM), buffer, size1);
65 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
66 spin_unlock_irqrestore(&gus->reg_lock, flags);
67 address += size1;
68 } else {
69 pbuffer = buffer;
70 size2 = size1;
71 while (size2--)
72 *pbuffer++ = snd_gf1_peek(gus, address++);
73 }
74 if (copy_to_user(_buffer, buffer, size1))
75 return -EFAULT;
76 size -= size1;
77 _buffer += size1;
78 }
79 return 0;
80 }
81
82 int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
83 unsigned int address, unsigned int size,
84 int rom)
85 {
86 return snd_gus_dram_peek(gus, buffer, address, size, rom);
87 }
88
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.