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Linux/sound/isa/sb/sb_common.c

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  1 /*
  2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  3  *                   Uros Bizjak <uros@kss-loka.si>
  4  *
  5  *  Lowlevel routines for control of Sound Blaster cards
  6  *
  7  *   This program is free software; you can redistribute it and/or modify
  8  *   it under the terms of the GNU General Public License as published by
  9  *   the Free Software Foundation; either version 2 of the License, or
 10  *   (at your option) any later version.
 11  *
 12  *   This program is distributed in the hope that it will be useful,
 13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *   GNU General Public License for more details.
 16  *
 17  *   You should have received a copy of the GNU General Public License
 18  *   along with this program; if not, write to the Free Software
 19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 20  *
 21  */
 22 
 23 #include <linux/delay.h>
 24 #include <linux/init.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/slab.h>
 27 #include <linux/ioport.h>
 28 #include <linux/module.h>
 29 #include <linux/io.h>
 30 #include <sound/core.h>
 31 #include <sound/sb.h>
 32 #include <sound/initval.h>
 33 
 34 #include <asm/dma.h>
 35 
 36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 37 MODULE_DESCRIPTION("ALSA lowlevel driver for Sound Blaster cards");
 38 MODULE_LICENSE("GPL");
 39 
 40 #define BUSY_LOOPS 100000
 41 
 42 #undef IO_DEBUG
 43 
 44 int snd_sbdsp_command(struct snd_sb *chip, unsigned char val)
 45 {
 46         int i;
 47 #ifdef IO_DEBUG
 48         snd_printk(KERN_DEBUG "command 0x%x\n", val);
 49 #endif
 50         for (i = BUSY_LOOPS; i; i--)
 51                 if ((inb(SBP(chip, STATUS)) & 0x80) == 0) {
 52                         outb(val, SBP(chip, COMMAND));
 53                         return 1;
 54                 }
 55         snd_printd("%s [0x%lx]: timeout (0x%x)\n", __func__, chip->port, val);
 56         return 0;
 57 }
 58 
 59 int snd_sbdsp_get_byte(struct snd_sb *chip)
 60 {
 61         int val;
 62         int i;
 63         for (i = BUSY_LOOPS; i; i--) {
 64                 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
 65                         val = inb(SBP(chip, READ));
 66 #ifdef IO_DEBUG
 67                         snd_printk(KERN_DEBUG "get_byte 0x%x\n", val);
 68 #endif
 69                         return val;
 70                 }
 71         }
 72         snd_printd("%s [0x%lx]: timeout\n", __func__, chip->port);
 73         return -ENODEV;
 74 }
 75 
 76 int snd_sbdsp_reset(struct snd_sb *chip)
 77 {
 78         int i;
 79 
 80         outb(1, SBP(chip, RESET));
 81         udelay(10);
 82         outb(0, SBP(chip, RESET));
 83         udelay(30);
 84         for (i = BUSY_LOOPS; i; i--)
 85                 if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
 86                         if (inb(SBP(chip, READ)) == 0xaa)
 87                                 return 0;
 88                         else
 89                                 break;
 90                 }
 91         snd_printdd("%s [0x%lx] failed...\n", __func__, chip->port);
 92         return -ENODEV;
 93 }
 94 
 95 static int snd_sbdsp_version(struct snd_sb * chip)
 96 {
 97         unsigned int result = -ENODEV;
 98 
 99         snd_sbdsp_command(chip, SB_DSP_GET_VERSION);
100         result = (short) snd_sbdsp_get_byte(chip) << 8;
101         result |= (short) snd_sbdsp_get_byte(chip);
102         return result;
103 }
104 
105 static int snd_sbdsp_probe(struct snd_sb * chip)
106 {
107         int version;
108         int major, minor;
109         char *str;
110         unsigned long flags;
111 
112         /*
113          *  initialization sequence
114          */
115 
116         spin_lock_irqsave(&chip->reg_lock, flags);
117         if (snd_sbdsp_reset(chip) < 0) {
118                 spin_unlock_irqrestore(&chip->reg_lock, flags);
119                 return -ENODEV;
120         }
121         version = snd_sbdsp_version(chip);
122         if (version < 0) {
123                 spin_unlock_irqrestore(&chip->reg_lock, flags);
124                 return -ENODEV;
125         }
126         spin_unlock_irqrestore(&chip->reg_lock, flags);
127         major = version >> 8;
128         minor = version & 0xff;
129         snd_printdd("SB [0x%lx]: DSP chip found, version = %i.%i\n",
130                     chip->port, major, minor);
131 
132         switch (chip->hardware) {
133         case SB_HW_AUTO:
134                 switch (major) {
135                 case 1:
136                         chip->hardware = SB_HW_10;
137                         str = "1.0";
138                         break;
139                 case 2:
140                         if (minor) {
141                                 chip->hardware = SB_HW_201;
142                                 str = "2.01+";
143                         } else {
144                                 chip->hardware = SB_HW_20;
145                                 str = "2.0";
146                         }
147                         break;
148                 case 3:
149                         chip->hardware = SB_HW_PRO;
150                         str = "Pro";
151                         break;
152                 case 4:
153                         chip->hardware = SB_HW_16;
154                         str = "16";
155                         break;
156                 default:
157                         snd_printk(KERN_INFO "SB [0x%lx]: unknown DSP chip version %i.%i\n",
158                                    chip->port, major, minor);
159                         return -ENODEV;
160                 }
161                 break;
162         case SB_HW_ALS100:
163                 str = "16 (ALS-100)";
164                 break;
165         case SB_HW_ALS4000:
166                 str = "16 (ALS-4000)";
167                 break;
168         case SB_HW_DT019X:
169                 str = "(DT019X/ALS007)";
170                 break;
171         case SB_HW_CS5530:
172                 str = "16 (CS5530)";
173                 break;
174         case SB_HW_JAZZ16:
175                 str = "Pro (Jazz16)";
176                 break;
177         default:
178                 return -ENODEV;
179         }
180         sprintf(chip->name, "Sound Blaster %s", str);
181         chip->version = (major << 8) | minor;
182         return 0;
183 }
184 
185 static int snd_sbdsp_free(struct snd_sb *chip)
186 {
187         release_and_free_resource(chip->res_port);
188         if (chip->irq >= 0)
189                 free_irq(chip->irq, (void *) chip);
190 #ifdef CONFIG_ISA
191         if (chip->dma8 >= 0) {
192                 disable_dma(chip->dma8);
193                 free_dma(chip->dma8);
194         }
195         if (chip->dma16 >= 0 && chip->dma16 != chip->dma8) {
196                 disable_dma(chip->dma16);
197                 free_dma(chip->dma16);
198         }
199 #endif
200         kfree(chip);
201         return 0;
202 }
203 
204 static int snd_sbdsp_dev_free(struct snd_device *device)
205 {
206         struct snd_sb *chip = device->device_data;
207         return snd_sbdsp_free(chip);
208 }
209 
210 int snd_sbdsp_create(struct snd_card *card,
211                      unsigned long port,
212                      int irq,
213                      irq_handler_t irq_handler,
214                      int dma8,
215                      int dma16,
216                      unsigned short hardware,
217                      struct snd_sb **r_chip)
218 {
219         struct snd_sb *chip;
220         int err;
221         static struct snd_device_ops ops = {
222                 .dev_free =     snd_sbdsp_dev_free,
223         };
224 
225         if (snd_BUG_ON(!r_chip))
226                 return -EINVAL;
227         *r_chip = NULL;
228         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
229         if (chip == NULL)
230                 return -ENOMEM;
231         spin_lock_init(&chip->reg_lock);
232         spin_lock_init(&chip->open_lock);
233         spin_lock_init(&chip->midi_input_lock);
234         spin_lock_init(&chip->mixer_lock);
235         chip->irq = -1;
236         chip->dma8 = -1;
237         chip->dma16 = -1;
238         chip->port = port;
239         
240         if (request_irq(irq, irq_handler,
241                         (hardware == SB_HW_ALS4000 ||
242                          hardware == SB_HW_CS5530) ?
243                         IRQF_SHARED : 0,
244                         "SoundBlaster", (void *) chip)) {
245                 snd_printk(KERN_ERR "sb: can't grab irq %d\n", irq);
246                 snd_sbdsp_free(chip);
247                 return -EBUSY;
248         }
249         chip->irq = irq;
250 
251         if (hardware == SB_HW_ALS4000)
252                 goto __skip_allocation;
253         
254         if ((chip->res_port = request_region(port, 16, "SoundBlaster")) == NULL) {
255                 snd_printk(KERN_ERR "sb: can't grab port 0x%lx\n", port);
256                 snd_sbdsp_free(chip);
257                 return -EBUSY;
258         }
259 
260 #ifdef CONFIG_ISA
261         if (dma8 >= 0 && request_dma(dma8, "SoundBlaster - 8bit")) {
262                 snd_printk(KERN_ERR "sb: can't grab DMA8 %d\n", dma8);
263                 snd_sbdsp_free(chip);
264                 return -EBUSY;
265         }
266         chip->dma8 = dma8;
267         if (dma16 >= 0) {
268                 if (hardware != SB_HW_ALS100 && (dma16 < 5 || dma16 > 7)) {
269                         /* no duplex */
270                         dma16 = -1;
271                 } else if (request_dma(dma16, "SoundBlaster - 16bit")) {
272                         snd_printk(KERN_ERR "sb: can't grab DMA16 %d\n", dma16);
273                         snd_sbdsp_free(chip);
274                         return -EBUSY;
275                 }
276         }
277         chip->dma16 = dma16;
278 #endif
279 
280       __skip_allocation:
281         chip->card = card;
282         chip->hardware = hardware;
283         if ((err = snd_sbdsp_probe(chip)) < 0) {
284                 snd_sbdsp_free(chip);
285                 return err;
286         }
287         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
288                 snd_sbdsp_free(chip);
289                 return err;
290         }
291         *r_chip = chip;
292         return 0;
293 }
294 
295 EXPORT_SYMBOL(snd_sbdsp_command);
296 EXPORT_SYMBOL(snd_sbdsp_get_byte);
297 EXPORT_SYMBOL(snd_sbdsp_reset);
298 EXPORT_SYMBOL(snd_sbdsp_create);
299 /* sb_mixer.c */
300 EXPORT_SYMBOL(snd_sbmixer_write);
301 EXPORT_SYMBOL(snd_sbmixer_read);
302 EXPORT_SYMBOL(snd_sbmixer_new);
303 EXPORT_SYMBOL(snd_sbmixer_add_ctl);
304 #ifdef CONFIG_PM
305 EXPORT_SYMBOL(snd_sbmixer_suspend);
306 EXPORT_SYMBOL(snd_sbmixer_resume);
307 #endif
308 
309 /*
310  *  INIT part
311  */
312 
313 static int __init alsa_sb_common_init(void)
314 {
315         return 0;
316 }
317 
318 static void __exit alsa_sb_common_exit(void)
319 {
320 }
321 
322 module_init(alsa_sb_common_init)
323 module_exit(alsa_sb_common_exit)
324 

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