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Linux/sound/pci/cs5530.c

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  1 /*
  2  * cs5530.c - Initialisation code for Cyrix/NatSemi VSA1 softaudio
  3  *
  4  *      (C) Copyright 2007 Ash Willis <ashwillis@programmer.net>
  5  *      (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
  6  *
  7  * This driver was ported (shamelessly ripped ;) from oss/kahlua.c but I did
  8  * mess with it a bit. The chip seems to have to have trouble with full duplex
  9  * mode. If we're recording in 8bit 8000kHz, say, and we then attempt to
 10  * simultaneously play back audio at 16bit 44100kHz, the device actually plays
 11  * back in the same format in which it is capturing. By forcing the chip to
 12  * always play/capture in 16/44100, we can let alsa-lib convert the samples and
 13  * that way we can hack up some full duplex audio. 
 14  * 
 15  * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
 16  * The older version (VSA1) provides fairly good soundblaster emulation
 17  * although there are a couple of bugs: large DMA buffers break record,
 18  * and the MPU event handling seems suspect. VSA2 allows the native driver
 19  * to control the AC97 audio engine directly and requires a different driver.
 20  *
 21  * Thanks to National Semiconductor for providing the needed information
 22  * on the XpressAudio(tm) internals.
 23  *
 24  * This program is free software; you can redistribute it and/or modify it
 25  * under the terms of the GNU General Public License as published by the
 26  * Free Software Foundation; either version 2, or (at your option) any
 27  * later version.
 28  *
 29  * This program is distributed in the hope that it will be useful, but
 30  * WITHOUT ANY WARRANTY; without even the implied warranty of
 31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 32  * General Public License for more details.
 33  *
 34  * TO DO:
 35  *      Investigate whether we can portably support Cognac (5520) in the
 36  *      same manner.
 37  */
 38 
 39 #include <linux/delay.h>
 40 #include <linux/module.h>
 41 #include <linux/pci.h>
 42 #include <linux/slab.h>
 43 #include <sound/core.h>
 44 #include <sound/sb.h>
 45 #include <sound/initval.h>
 46 
 47 MODULE_AUTHOR("Ash Willis");
 48 MODULE_DESCRIPTION("CS5530 Audio");
 49 MODULE_LICENSE("GPL");
 50 
 51 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 52 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 53 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 54 
 55 module_param_array(index, int, NULL, 0444);
 56 MODULE_PARM_DESC(index, "Index value for CS5530 Audio driver.");
 57 module_param_array(id, charp, NULL, 0444);
 58 MODULE_PARM_DESC(id, "ID string for CS5530 Audio driver.");
 59 module_param_array(enable, bool, NULL, 0444);
 60 MODULE_PARM_DESC(enable, "Enable CS5530 Audio driver.");
 61 
 62 struct snd_cs5530 {
 63         struct snd_card *card;
 64         struct pci_dev *pci;
 65         struct snd_sb *sb;
 66         unsigned long pci_base;
 67 };
 68 
 69 static DEFINE_PCI_DEVICE_TABLE(snd_cs5530_ids) = {
 70         {PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO, PCI_ANY_ID,
 71                                                         PCI_ANY_ID, 0, 0},
 72         {0,}
 73 };
 74 
 75 MODULE_DEVICE_TABLE(pci, snd_cs5530_ids);
 76 
 77 static int snd_cs5530_free(struct snd_cs5530 *chip)
 78 {
 79         pci_release_regions(chip->pci);
 80         pci_disable_device(chip->pci);
 81         kfree(chip);
 82         return 0;
 83 }
 84 
 85 static int snd_cs5530_dev_free(struct snd_device *device)
 86 {
 87         struct snd_cs5530 *chip = device->device_data;
 88         return snd_cs5530_free(chip);
 89 }
 90 
 91 static void snd_cs5530_remove(struct pci_dev *pci)
 92 {
 93         snd_card_free(pci_get_drvdata(pci));
 94 }
 95 
 96 static u8 snd_cs5530_mixer_read(unsigned long io, u8 reg)
 97 {
 98         outb(reg, io + 4);
 99         udelay(20);
100         reg = inb(io + 5);
101         udelay(20);
102         return reg;
103 }
104 
105 static int snd_cs5530_create(struct snd_card *card,
106                              struct pci_dev *pci,
107                              struct snd_cs5530 **rchip)
108 {
109         struct snd_cs5530 *chip;
110         unsigned long sb_base;
111         u8 irq, dma8, dma16 = 0;
112         u16 map;
113         void __iomem *mem;
114         int err;
115 
116         static struct snd_device_ops ops = {
117                 .dev_free = snd_cs5530_dev_free,
118         };
119         *rchip = NULL;
120 
121         err = pci_enable_device(pci);
122         if (err < 0)
123                 return err;
124 
125         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
126         if (chip == NULL) {
127                 pci_disable_device(pci);
128                 return -ENOMEM;
129         }
130 
131         chip->card = card;
132         chip->pci = pci;
133 
134         err = pci_request_regions(pci, "CS5530");
135         if (err < 0) {
136                 kfree(chip); 
137                 pci_disable_device(pci);
138                 return err;
139         }
140         chip->pci_base = pci_resource_start(pci, 0);
141 
142         mem = pci_ioremap_bar(pci, 0);
143         if (mem == NULL) {
144                 snd_cs5530_free(chip);
145                 return -EBUSY;
146         }
147 
148         map = readw(mem + 0x18);
149         iounmap(mem);
150 
151         /* Map bits
152                 0:1     * 0x20 + 0x200 = sb base
153                 2       sb enable
154                 3       adlib enable
155                 5       MPU enable 0x330
156                 6       MPU enable 0x300
157 
158            The other bits may be used internally so must be masked */
159 
160         sb_base = 0x220 + 0x20 * (map & 3);
161 
162         if (map & (1<<2))
163                 printk(KERN_INFO "CS5530: XpressAudio at 0x%lx\n", sb_base);
164         else {
165                 printk(KERN_ERR "Could not find XpressAudio!\n");
166                 snd_cs5530_free(chip);
167                 return -ENODEV;
168         }
169 
170         if (map & (1<<5))
171                 printk(KERN_INFO "CS5530: MPU at 0x300\n");
172         else if (map & (1<<6))
173                 printk(KERN_INFO "CS5530: MPU at 0x330\n");
174 
175         irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
176         dma8 = snd_cs5530_mixer_read(sb_base, 0x81);
177 
178         if (dma8 & 0x20)
179                 dma16 = 5;
180         else if (dma8 & 0x40)
181                 dma16 = 6;
182         else if (dma8 & 0x80)
183                 dma16 = 7;
184         else {
185                 printk(KERN_ERR "CS5530: No 16bit DMA enabled\n");
186                 snd_cs5530_free(chip);
187                 return -ENODEV;
188         }
189 
190         if (dma8 & 0x01)
191                 dma8 = 0;
192         else if (dma8 & 02)
193                 dma8 = 1;
194         else if (dma8 & 0x08)
195                 dma8 = 3;
196         else {
197                 printk(KERN_ERR "CS5530: No 8bit DMA enabled\n");
198                 snd_cs5530_free(chip);
199                 return -ENODEV;
200         }
201 
202         if (irq & 1)
203                 irq = 9;
204         else if (irq & 2)
205                 irq = 5;
206         else if (irq & 4)
207                 irq = 7;
208         else if (irq & 8)
209                 irq = 10;
210         else {
211                 printk(KERN_ERR "CS5530: SoundBlaster IRQ not set\n");
212                 snd_cs5530_free(chip);
213                 return -ENODEV;
214         }
215 
216         printk(KERN_INFO "CS5530: IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, 
217                                                                         dma16);
218 
219         err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
220                                                 dma16, SB_HW_CS5530, &chip->sb);
221         if (err < 0) {
222                 printk(KERN_ERR "CS5530: Could not create SoundBlaster\n");
223                 snd_cs5530_free(chip);
224                 return err;
225         }
226 
227         err = snd_sb16dsp_pcm(chip->sb, 0, &chip->sb->pcm);
228         if (err < 0) {
229                 printk(KERN_ERR "CS5530: Could not create PCM\n");
230                 snd_cs5530_free(chip);
231                 return err;
232         }
233 
234         err = snd_sbmixer_new(chip->sb);
235         if (err < 0) {
236                 printk(KERN_ERR "CS5530: Could not create Mixer\n");
237                 snd_cs5530_free(chip);
238                 return err;
239         }
240 
241         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
242         if (err < 0) {
243                 snd_cs5530_free(chip);
244                 return err;
245         }
246 
247         snd_card_set_dev(card, &pci->dev);
248         *rchip = chip;
249         return 0;
250 }
251 
252 static int snd_cs5530_probe(struct pci_dev *pci,
253                             const struct pci_device_id *pci_id)
254 {
255         static int dev;
256         struct snd_card *card;
257         struct snd_cs5530 *chip = NULL;
258         int err;
259 
260         if (dev >= SNDRV_CARDS)
261                 return -ENODEV;
262         if (!enable[dev]) {
263                 dev++;
264                 return -ENOENT;
265         }
266 
267         err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
268 
269         if (err < 0)
270                 return err;
271 
272         err = snd_cs5530_create(card, pci, &chip);
273         if (err < 0) {
274                 snd_card_free(card);
275                 return err;
276         }
277 
278         strcpy(card->driver, "CS5530");
279         strcpy(card->shortname, "CS5530 Audio");
280         sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);
281 
282         err = snd_card_register(card);
283         if (err < 0) {
284                 snd_card_free(card);
285                 return err;
286         }
287         pci_set_drvdata(pci, card);
288         dev++;
289         return 0;
290 }
291 
292 static struct pci_driver cs5530_driver = {
293         .name = KBUILD_MODNAME,
294         .id_table = snd_cs5530_ids,
295         .probe = snd_cs5530_probe,
296         .remove = snd_cs5530_remove,
297 };
298 
299 module_pci_driver(cs5530_driver);
300 

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