1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4*4882a593Smuzhiyun * DRAM access routines
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/time.h>
8*4882a593Smuzhiyun #include <sound/core.h>
9*4882a593Smuzhiyun #include <sound/gus.h>
10*4882a593Smuzhiyun #include <sound/info.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun
snd_gus_dram_poke(struct snd_gus_card * gus,char __user * _buffer,unsigned int address,unsigned int size)13*4882a593Smuzhiyun static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer,
14*4882a593Smuzhiyun unsigned int address, unsigned int size)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun unsigned long flags;
17*4882a593Smuzhiyun unsigned int size1, size2;
18*4882a593Smuzhiyun char buffer[256], *pbuffer;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun while (size > 0) {
21*4882a593Smuzhiyun size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
22*4882a593Smuzhiyun if (copy_from_user(buffer, _buffer, size1))
23*4882a593Smuzhiyun return -EFAULT;
24*4882a593Smuzhiyun if (gus->interwave) {
25*4882a593Smuzhiyun spin_lock_irqsave(&gus->reg_lock, flags);
26*4882a593Smuzhiyun snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
27*4882a593Smuzhiyun snd_gf1_dram_addr(gus, address);
28*4882a593Smuzhiyun outsb(GUSP(gus, DRAM), buffer, size1);
29*4882a593Smuzhiyun spin_unlock_irqrestore(&gus->reg_lock, flags);
30*4882a593Smuzhiyun address += size1;
31*4882a593Smuzhiyun } else {
32*4882a593Smuzhiyun pbuffer = buffer;
33*4882a593Smuzhiyun size2 = size1;
34*4882a593Smuzhiyun while (size2--)
35*4882a593Smuzhiyun snd_gf1_poke(gus, address++, *pbuffer++);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun size -= size1;
38*4882a593Smuzhiyun _buffer += size1;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun return 0;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun
snd_gus_dram_write(struct snd_gus_card * gus,char __user * buffer,unsigned int address,unsigned int size)44*4882a593Smuzhiyun int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer,
45*4882a593Smuzhiyun unsigned int address, unsigned int size)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun return snd_gus_dram_poke(gus, buffer, address, size);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
snd_gus_dram_peek(struct snd_gus_card * gus,char __user * _buffer,unsigned int address,unsigned int size,int rom)50*4882a593Smuzhiyun static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer,
51*4882a593Smuzhiyun unsigned int address, unsigned int size,
52*4882a593Smuzhiyun int rom)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun unsigned long flags;
55*4882a593Smuzhiyun unsigned int size1, size2;
56*4882a593Smuzhiyun char buffer[256], *pbuffer;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun while (size > 0) {
59*4882a593Smuzhiyun size1 = size > sizeof(buffer) ? sizeof(buffer) : size;
60*4882a593Smuzhiyun if (gus->interwave) {
61*4882a593Smuzhiyun spin_lock_irqsave(&gus->reg_lock, flags);
62*4882a593Smuzhiyun snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01);
63*4882a593Smuzhiyun snd_gf1_dram_addr(gus, address);
64*4882a593Smuzhiyun insb(GUSP(gus, DRAM), buffer, size1);
65*4882a593Smuzhiyun snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
66*4882a593Smuzhiyun spin_unlock_irqrestore(&gus->reg_lock, flags);
67*4882a593Smuzhiyun address += size1;
68*4882a593Smuzhiyun } else {
69*4882a593Smuzhiyun pbuffer = buffer;
70*4882a593Smuzhiyun size2 = size1;
71*4882a593Smuzhiyun while (size2--)
72*4882a593Smuzhiyun *pbuffer++ = snd_gf1_peek(gus, address++);
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun if (copy_to_user(_buffer, buffer, size1))
75*4882a593Smuzhiyun return -EFAULT;
76*4882a593Smuzhiyun size -= size1;
77*4882a593Smuzhiyun _buffer += size1;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun return 0;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
snd_gus_dram_read(struct snd_gus_card * gus,char __user * buffer,unsigned int address,unsigned int size,int rom)82*4882a593Smuzhiyun int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer,
83*4882a593Smuzhiyun unsigned int address, unsigned int size,
84*4882a593Smuzhiyun int rom)
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun return snd_gus_dram_peek(gus, buffer, address, size, rom);
87*4882a593Smuzhiyun }
88