xref: /linux/sound/isa/gus/gus_dram.c (revision 05a54fa773284d1a7923cdfdd8f0c8dabb98bd26)
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 int size1, size2;
17 	char buffer[256], *pbuffer;
18 
19 	while (size > 0) {
20 		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
21 		if (copy_from_user(buffer, _buffer, size1))
22 			return -EFAULT;
23 		if (gus->interwave) {
24 			guard(spinlock_irqsave)(&gus->reg_lock);
25 			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
26 			snd_gf1_dram_addr(gus, address);
27 			outsb(GUSP(gus, DRAM), buffer, size1);
28 			address += size1;
29 		} else {
30 			pbuffer = buffer;
31 			size2 = size1;
32 			while (size2--)
33 				snd_gf1_poke(gus, address++, *pbuffer++);
34 		}
35 		size -= size1;
36 		_buffer += size1;
37 	}
38 	return 0;
39 }
40 
41 
42 int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
43 		       unsigned int address, unsigned int size)
44 {
45 	return snd_gus_dram_poke(gus, buffer, address, size);
46 }
47 
48 static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
49 			     unsigned int address, unsigned int size,
50 			     int rom)
51 {
52 	unsigned int size1, size2;
53 	char buffer[256], *pbuffer;
54 
55 	while (size > 0) {
56 		size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
57 		if (gus->interwave) {
58 			guard(spinlock_irqsave)(&gus->reg_lock);
59 			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
60 			snd_gf1_dram_addr(gus, address);
61 			insb(GUSP(gus, DRAM), buffer, size1);
62 			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
63 			address += size1;
64 		} else {
65 			pbuffer = buffer;
66 			size2 = size1;
67 			while (size2--)
68 				*pbuffer++ = snd_gf1_peek(gus, address++);
69 		}
70 		if (copy_to_user(_buffer, buffer, size1))
71 			return -EFAULT;
72 		size -= size1;
73 		_buffer += size1;
74 	}
75 	return 0;
76 }
77 
78 int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
79 		      unsigned int address, unsigned int size,
80 		      int rom)
81 {
82 	return snd_gus_dram_peek(gus, buffer, address, size, rom);
83 }
84