tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Initialisation code for Cyrix/NatSemi VSA1 softaudio
3 *
4 * (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
5 *
6 * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
7 * The older version (VSA1) provides fairly good soundblaster emulation
8 * although there are a couple of bugs: large DMA buffers break record,
9 * and the MPU event handling seems suspect. VSA2 allows the native driver
10 * to control the AC97 audio engine directly and requires a different driver.
11 *
12 * Thanks to National Semiconductor for providing the needed information
13 * on the XpressAudio(tm) internals.
14 *
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2, or (at your option) any
18 * later version.
19 *
20 * This program is distributed in the hope that it will be useful, but
21 * WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
24 *
25 * TO DO:
26 * Investigate whether we can portably support Cognac (5520) in the
27 * same manner.
28 */
29
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/module.h>
33#include <linux/pci.h>
34
35#include "sound_config.h"
36
37#include "sb.h"
38
39/*
40 * Read a soundblaster compatible mixer register.
41 * In this case we are actually reading an SMI trap
42 * not real hardware.
43 */
44
45static u8 __devinit mixer_read(unsigned long io, u8 reg)
46{
47 outb(reg, io + 4);
48 udelay(20);
49 reg = inb(io + 5);
50 udelay(20);
51 return reg;
52}
53
54static int __devinit probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
55{
56 struct address_info *hw_config;
57 unsigned long base;
58 void __iomem *mem;
59 unsigned long io;
60 u16 map;
61 u8 irq, dma8, dma16;
62 int oldquiet;
63 extern int sb_be_quiet;
64
65 base = pci_resource_start(pdev, 0);
66 if(base == 0UL)
67 return 1;
68
69 mem = ioremap(base, 128);
70 if (!mem)
71 return 1;
72 map = readw(mem + 0x18); /* Read the SMI enables */
73 iounmap(mem);
74
75 /* Map bits
76 0:1 * 0x20 + 0x200 = sb base
77 2 sb enable
78 3 adlib enable
79 5 MPU enable 0x330
80 6 MPU enable 0x300
81
82 The other bits may be used internally so must be masked */
83
84 io = 0x220 + 0x20 * (map & 3);
85
86 if(map & (1<<2))
87 printk(KERN_INFO "kahlua: XpressAudio at 0x%lx\n", io);
88 else
89 return 1;
90
91 if(map & (1<<5))
92 printk(KERN_INFO "kahlua: MPU at 0x300\n");
93 else if(map & (1<<6))
94 printk(KERN_INFO "kahlua: MPU at 0x330\n");
95
96 irq = mixer_read(io, 0x80) & 0x0F;
97 dma8 = mixer_read(io, 0x81);
98
99 // printk("IRQ=%x MAP=%x DMA=%x\n", irq, map, dma8);
100
101 if(dma8 & 0x20)
102 dma16 = 5;
103 else if(dma8 & 0x40)
104 dma16 = 6;
105 else if(dma8 & 0x80)
106 dma16 = 7;
107 else
108 {
109 printk(KERN_ERR "kahlua: No 16bit DMA enabled.\n");
110 return 1;
111 }
112
113 if(dma8 & 0x01)
114 dma8 = 0;
115 else if(dma8 & 0x02)
116 dma8 = 1;
117 else if(dma8 & 0x08)
118 dma8 = 3;
119 else
120 {
121 printk(KERN_ERR "kahlua: No 8bit DMA enabled.\n");
122 return 1;
123 }
124
125 if(irq & 1)
126 irq = 9;
127 else if(irq & 2)
128 irq = 5;
129 else if(irq & 4)
130 irq = 7;
131 else if(irq & 8)
132 irq = 10;
133 else
134 {
135 printk(KERN_ERR "kahlua: SB IRQ not set.\n");
136 return 1;
137 }
138
139 printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n",
140 irq, dma8, dma16);
141
142 hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL);
143 if(hw_config == NULL)
144 {
145 printk(KERN_ERR "kahlua: out of memory.\n");
146 return 1;
147 }
148
149 pci_set_drvdata(pdev, hw_config);
150
151 hw_config->io_base = io;
152 hw_config->irq = irq;
153 hw_config->dma = dma8;
154 hw_config->dma2 = dma16;
155 hw_config->name = "Cyrix XpressAudio";
156 hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ;
157
158 if (!request_region(io, 16, "soundblaster"))
159 goto err_out_free;
160
161 if(sb_dsp_detect(hw_config, 0, 0, NULL)==0)
162 {
163 printk(KERN_ERR "kahlua: audio not responding.\n");
164 release_region(io, 16);
165 goto err_out_free;
166 }
167
168 oldquiet = sb_be_quiet;
169 sb_be_quiet = 1;
170 if(sb_dsp_init(hw_config, THIS_MODULE))
171 {
172 sb_be_quiet = oldquiet;
173 goto err_out_free;
174 }
175 sb_be_quiet = oldquiet;
176
177 return 0;
178
179err_out_free:
180 pci_set_drvdata(pdev, NULL);
181 kfree(hw_config);
182 return 1;
183}
184
185static void __devexit remove_one(struct pci_dev *pdev)
186{
187 struct address_info *hw_config = pci_get_drvdata(pdev);
188 sb_dsp_unload(hw_config, 0);
189 pci_set_drvdata(pdev, NULL);
190 kfree(hw_config);
191}
192
193MODULE_AUTHOR("Alan Cox");
194MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio");
195MODULE_LICENSE("GPL");
196
197/*
198 * 5530 only. The 5510/5520 decode is different.
199 */
200
201static struct pci_device_id id_tbl[] = {
202 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
203 { }
204};
205
206MODULE_DEVICE_TABLE(pci, id_tbl);
207
208static struct pci_driver kahlua_driver = {
209 .name = "kahlua",
210 .id_table = id_tbl,
211 .probe = probe_one,
212 .remove = __devexit_p(remove_one),
213};
214
215
216static int __init kahlua_init_module(void)
217{
218 printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc\n");
219 return pci_register_driver(&kahlua_driver);
220}
221
222static void __devexit kahlua_cleanup_module(void)
223{
224 pci_unregister_driver(&kahlua_driver);
225}
226
227
228module_init(kahlua_init_module);
229module_exit(kahlua_cleanup_module);
230