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#include <linux/slab.h>
 35
 36#include "sound_config.h"
 37
 38#include "sb.h"
 39
 40/*
 41 *	Read a soundblaster compatible mixer register.
 42 *	In this case we are actually reading an SMI trap
 43 *	not real hardware.
 44 */
 45
 46static u8 mixer_read(unsigned long io, u8 reg)
 47{
 48	outb(reg, io + 4);
 49	udelay(20);
 50	reg = inb(io + 5);
 51	udelay(20);
 52	return reg;
 53}
 54
 55static int probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 56{
 57	struct address_info *hw_config;
 58	unsigned long base;
 59	void __iomem *mem;
 60	unsigned long io;
 61	u16 map;
 62	u8 irq, dma8, dma16;
 63	int oldquiet;
 64	extern int sb_be_quiet;
 65		
 66	base = pci_resource_start(pdev, 0);
 67	if(base == 0UL)
 68		return 1;
 69	
 70	mem = ioremap(base, 128);
 71	if (!mem)
 72		return 1;
 73	map = readw(mem + 0x18);	/* Read the SMI enables */
 74	iounmap(mem);
 75	
 76	/* Map bits
 77		0:1	* 0x20 + 0x200 = sb base
 78		2	sb enable
 79		3	adlib enable
 80		5	MPU enable 0x330
 81		6	MPU enable 0x300
 82		
 83	   The other bits may be used internally so must be masked */
 84
 85	io = 0x220 + 0x20 * (map & 3);	   
 86	
 87	if(map & (1<<2))
 88		printk(KERN_INFO "kahlua: XpressAudio at 0x%lx\n", io);
 89	else
 90		return 1;
 91		
 92	if(map & (1<<5))
 93		printk(KERN_INFO "kahlua: MPU at 0x300\n");
 94	else if(map & (1<<6))
 95		printk(KERN_INFO "kahlua: MPU at 0x330\n");
 96	
 97	irq = mixer_read(io, 0x80) & 0x0F;
 98	dma8 = mixer_read(io, 0x81);
 99
100	// printk("IRQ=%x MAP=%x DMA=%x\n", irq, map, dma8);
101	
102	if(dma8 & 0x20)
103		dma16 = 5;
104	else if(dma8 & 0x40)
105		dma16 = 6;
106	else if(dma8 & 0x80)
107		dma16 = 7;
108	else
109	{
110		printk(KERN_ERR "kahlua: No 16bit DMA enabled.\n");
111		return 1;
112	}
113		
114	if(dma8 & 0x01)
115		dma8 = 0;
116	else if(dma8 & 0x02)
117		dma8 = 1;
118	else if(dma8 & 0x08)
119		dma8 = 3;
120	else
121	{
122		printk(KERN_ERR "kahlua: No 8bit DMA enabled.\n");
123		return 1;
124	}
125	
126	if(irq & 1)
127		irq = 9;
128	else if(irq & 2)
129		irq = 5;
130	else if(irq & 4)
131		irq = 7;
132	else if(irq & 8)
133		irq = 10;
134	else
135	{
136		printk(KERN_ERR "kahlua: SB IRQ not set.\n");
137		return 1;
138	}
139	
140	printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n",
141		irq, dma8, dma16);
142	
143	hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL);
144	if(hw_config == NULL)
145	{
146		printk(KERN_ERR "kahlua: out of memory.\n");
147		return 1;
148	}
149	
150	pci_set_drvdata(pdev, hw_config);
151	
152	hw_config->io_base = io;
153	hw_config->irq = irq;
154	hw_config->dma = dma8;
155	hw_config->dma2 = dma16;
156	hw_config->name = "Cyrix XpressAudio";
157	hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ;
158
159	if (!request_region(io, 16, "soundblaster"))
160		goto err_out_free;
161	
162	if(sb_dsp_detect(hw_config, 0, 0, NULL)==0)
163	{
164		printk(KERN_ERR "kahlua: audio not responding.\n");
165		release_region(io, 16);
166		goto err_out_free;
167	}
168
169	oldquiet = sb_be_quiet;	
170	sb_be_quiet = 1;
171	if(sb_dsp_init(hw_config, THIS_MODULE))
172	{
173		sb_be_quiet = oldquiet;
174		goto err_out_free;
175	}
176	sb_be_quiet = oldquiet;
177	
178	return 0;
179
180err_out_free:
181	kfree(hw_config);
182	return 1;
183}
184
185static void 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	kfree(hw_config);
190}
191
192MODULE_AUTHOR("Alan Cox");
193MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio");
194MODULE_LICENSE("GPL");
195
196/*
197 *	5530 only. The 5510/5520 decode is different.
198 */
199
200static const struct pci_device_id id_tbl[] = {
201	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO), 0 },
202	{ }
203};
204
205MODULE_DEVICE_TABLE(pci, id_tbl);
206
207static struct pci_driver kahlua_driver = {
208	.name		= "kahlua",
209	.id_table	= id_tbl,
210	.probe		= probe_one,
211	.remove		= remove_one,
212};
213
214
215static int __init kahlua_init_module(void)
216{
217	printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc\n");
218	return pci_register_driver(&kahlua_driver);
219}
220
221static void kahlua_cleanup_module(void)
222{
223	pci_unregister_driver(&kahlua_driver);
224}
225
226
227module_init(kahlua_init_module);
228module_exit(kahlua_cleanup_module);
229