2 * linux/drivers/sound/vidc.c
4 * Copyright (C) 1997-2000 by Russell King <rmk@arm.linux.org.uk>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * VIDC20 audio driver.
12 * The VIDC20 sound hardware consists of the VIDC20 itself, a DAC and a DMA
13 * engine. The DMA transfers fixed-format (16-bit little-endian linear)
14 * samples to the VIDC20, which then transfers this data serially to the
15 * DACs. The samplerate is controlled by the VIDC.
17 * We currently support a mixer device, but it is currently non-functional.
20 #include <linux/config.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/interrupt.h>
26 #include <asm/hardware.h>
29 #include <asm/hardware/iomd.h>
31 #include <asm/system.h>
33 #include "sound_config.h"
37 #define _SIOC_TYPE(x) _IOC_TYPE(x)
40 #define _SIOC_NR(x) _IOC_NR(x)
43 #define VIDC_SOUND_CLOCK (250000)
44 #define VIDC_SOUND_CLOCK_EXT (176400)
47 * When using SERIAL SOUND mode (external DAC), the number of physical
48 * channels is fixed at 2.
52 static int vidc_audio_rate;
53 static char vidc_audio_format;
54 static char vidc_audio_channels;
56 static unsigned char vidc_level_l[SOUND_MIXER_NRDEVICES] = {
69 static unsigned char vidc_level_r[SOUND_MIXER_NRDEVICES] = {
82 static unsigned int vidc_audio_volume_l; /* left PCM vol, 0 - 65536 */
83 static unsigned int vidc_audio_volume_r; /* right PCM vol, 0 - 65536 */
85 extern void vidc_update_filler(int bits, int channels);
86 extern int softoss_dev;
89 vidc_mixer_set(int mdev, unsigned int level)
91 unsigned int lev_l = level & 0x007f;
92 unsigned int lev_r = (level & 0x7f00) >> 8;
93 unsigned int mlev_l, mlev_r;
100 #define SCALE(lev,master) ((lev) * (master) * 65536 / 10000)
102 mlev_l = vidc_level_l[SOUND_MIXER_VOLUME];
103 mlev_r = vidc_level_r[SOUND_MIXER_VOLUME];
106 case SOUND_MIXER_VOLUME:
107 case SOUND_MIXER_PCM:
108 vidc_level_l[mdev] = lev_l;
109 vidc_level_r[mdev] = lev_r;
111 vidc_audio_volume_l = SCALE(lev_l, mlev_l);
112 vidc_audio_volume_r = SCALE(lev_r, mlev_r);
113 /*printk("VIDC: PCM vol %05X %05X\n", vidc_audio_volume_l, vidc_audio_volume_r);*/
119 static int vidc_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
124 if (_SIOC_TYPE(cmd) != 'M')
127 mdev = _SIOC_NR(cmd);
129 if (_SIOC_DIR(cmd) & _SIOC_WRITE) {
130 if (get_user(val, (unsigned int __user *)arg))
133 if (mdev < SOUND_MIXER_NRDEVICES)
134 vidc_mixer_set(mdev, val);
143 case SOUND_MIXER_RECSRC:
147 case SOUND_MIXER_DEVMASK:
148 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
151 case SOUND_MIXER_STEREODEVS:
152 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
155 case SOUND_MIXER_RECMASK:
159 case SOUND_MIXER_CAPS:
164 if (mdev < SOUND_MIXER_NRDEVICES)
165 val = vidc_level_l[mdev] | vidc_level_r[mdev] << 8;
170 return put_user(val, (unsigned int __user *)arg) ? -EFAULT : 0;
173 static unsigned int vidc_audio_set_format(int dev, unsigned int fmt)
181 vidc_audio_format = fmt;
182 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
186 return vidc_audio_format;
189 #define my_abs(i) ((i)<0 ? -(i) : (i))
191 static int vidc_audio_set_speed(int dev, int rate)
194 unsigned int hwctrl, hwrate, hwrate_ext, rate_int, rate_ext;
195 unsigned int diff_int, diff_ext;
196 unsigned int newsize, new2size;
200 /* Using internal clock */
201 hwrate = (((VIDC_SOUND_CLOCK * 2) / rate) + 1) >> 1;
207 /* Using exernal clock */
208 hwrate_ext = (((VIDC_SOUND_CLOCK_EXT * 2) / rate) + 1) >> 1;
211 if (hwrate_ext > 255)
214 rate_int = VIDC_SOUND_CLOCK / hwrate;
215 rate_ext = VIDC_SOUND_CLOCK_EXT / hwrate_ext;
217 /* Chose between external and internal clock */
218 diff_int = my_abs(rate_ext-rate);
219 diff_ext = my_abs(rate_int-rate);
220 if (diff_ext < diff_int) {
221 /*printk("VIDC: external %d %d %d\n", rate, rate_ext, hwrate_ext);*/
224 /* Allow roughly 0.4% tolerance */
225 if (diff_ext > (rate/256))
228 /*printk("VIDC: internal %d %d %d\n", rate, rate_int, hwrate);*/
230 /* Allow rougly 0.4% tolerance */
231 if (diff_int > (rate/256))
235 vidc_writel(0xb0000000 | (hwrate - 2));
236 vidc_writel(0xb1000000 | hwctrl);
238 newsize = (10000 / hwrate) & ~3;
243 for (new2size = 128; new2size < newsize; new2size <<= 1);
244 if (new2size - newsize > newsize - (new2size >> 1))
246 if (new2size > 4096) {
247 printk(KERN_ERR "VIDC: error: dma buffer (%d) %d > 4K\n",
251 /*printk("VIDC: dma size %d\n", new2size);*/
252 dma_bufsize = new2size;
253 vidc_audio_rate = rate;
255 return vidc_audio_rate;
258 static short vidc_audio_set_channels(int dev, short channels)
265 vidc_audio_channels = channels;
266 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
270 return vidc_audio_channels;
276 static int vidc_audio_open(int dev, int mode)
278 /* This audio device does not have recording capability */
279 if (mode == OPEN_READ)
292 static void vidc_audio_close(int dev)
298 * Output a block via DMA to sound device.
300 * We just set the DMA start and count; the DMA interrupt routine
301 * will take care of formatting the samples (via the appropriate
302 * vidc_filler routine), and flag via vidc_audio_dma_interrupt when
303 * more data is required.
306 vidc_audio_output_block(int dev, unsigned long buf, int total_count, int one)
308 struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
311 local_irq_save(flags);
312 dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
313 dma_count = total_count;
314 local_irq_restore(flags);
318 vidc_audio_start_input(int dev, unsigned long buf, int count, int intrflag)
322 static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
327 static irqreturn_t vidc_audio_dma_interrupt(void)
329 DMAbuf_outputintr(vidc_adev, 1);
334 * Prepare for outputting samples.
336 * Each buffer that will be passed will be `bsize' bytes long,
337 * with a total of `bcount' buffers.
339 static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
341 struct audio_operations *adev = audio_devs[dev];
343 dma_interrupt = NULL;
344 adev->dmap_out->flags |= DMA_NODMA;
350 * Stop our current operation.
352 static void vidc_audio_reset(int dev)
354 dma_interrupt = NULL;
357 static int vidc_audio_local_qlen(int dev)
359 return /*dma_count !=*/ 0;
362 static void vidc_audio_trigger(int dev, int enable_bits)
364 struct audio_operations *adev = audio_devs[dev];
366 if (enable_bits & PCM_ENABLE_OUTPUT) {
367 if (!(adev->flags & DMA_ACTIVE)) {
370 local_irq_save(flags);
372 /* prevent recusion */
373 adev->flags |= DMA_ACTIVE;
375 dma_interrupt = vidc_audio_dma_interrupt;
376 vidc_sound_dma_irq(0, NULL, NULL);
377 iomd_writeb(DMA_CR_E | 0x10, IOMD_SD0CR);
379 local_irq_restore(flags);
384 static struct audio_driver vidc_audio_driver =
386 .owner = THIS_MODULE,
387 .open = vidc_audio_open,
388 .close = vidc_audio_close,
389 .output_block = vidc_audio_output_block,
390 .start_input = vidc_audio_start_input,
391 .prepare_for_input = vidc_audio_prepare_for_input,
392 .prepare_for_output = vidc_audio_prepare_for_output,
393 .halt_io = vidc_audio_reset,
394 .local_qlen = vidc_audio_local_qlen,
395 .trigger = vidc_audio_trigger,
396 .set_speed = vidc_audio_set_speed,
397 .set_bits = vidc_audio_set_format,
398 .set_channels = vidc_audio_set_channels
401 static struct mixer_operations vidc_mixer_operations = {
402 .owner = THIS_MODULE,
405 .ioctl = vidc_mixer_ioctl
408 void vidc_update_filler(int format, int channels)
410 #define TYPE(fmt,ch) (((fmt)<<2) | ((ch)&3))
412 switch (TYPE(format, channels)) {
414 case TYPE(AFMT_U8, 1):
415 vidc_filler = vidc_fill_1x8_u;
418 case TYPE(AFMT_U8, 2):
419 vidc_filler = vidc_fill_2x8_u;
422 case TYPE(AFMT_S8, 1):
423 vidc_filler = vidc_fill_1x8_s;
426 case TYPE(AFMT_S8, 2):
427 vidc_filler = vidc_fill_2x8_s;
430 case TYPE(AFMT_S16_LE, 1):
431 vidc_filler = vidc_fill_1x16_s;
434 case TYPE(AFMT_S16_LE, 2):
435 vidc_filler = vidc_fill_2x16_s;
440 static void __init attach_vidc(struct address_info *hw_config)
445 sprintf(name, "VIDC %d-bit sound", hw_config->card_subtype);
446 conf_printf(name, hw_config);
447 memset(dma_buf, 0, sizeof(dma_buf));
449 adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION, name,
450 &vidc_audio_driver, sizeof(vidc_audio_driver),
451 DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
452 NULL, hw_config->dma, hw_config->dma2);
458 * 1024 bytes => 64 buffers
460 audio_devs[adev]->min_fragment = 10;
461 audio_devs[adev]->mixer_dev = num_mixers;
463 audio_devs[adev]->mixer_dev =
464 sound_install_mixer(MIXER_DRIVER_VERSION,
465 name, &vidc_mixer_operations,
466 sizeof(vidc_mixer_operations), NULL);
468 if (audio_devs[adev]->mixer_dev < 0)
471 for (i = 0; i < 2; i++) {
472 dma_buf[i] = get_zeroed_page(GFP_KERNEL);
474 printk(KERN_ERR "%s: can't allocate required buffers\n",
478 dma_pbuf[i] = virt_to_phys((void *)dma_buf[i]);
481 if (sound_alloc_dma(hw_config->dma, hw_config->name)) {
482 printk(KERN_ERR "%s: DMA %d is in use\n", name, hw_config->dma);
486 if (request_irq(hw_config->irq, vidc_sound_dma_irq, 0,
487 hw_config->name, &dma_start)) {
488 printk(KERN_ERR "%s: IRQ %d is in use\n", name, hw_config->irq);
492 vidc_mixer_set(SOUND_MIXER_VOLUME, (85 | 85 << 8));
494 #if defined(CONFIG_SOUND_SOFTOSS) || defined(CONFIG_SOUND_SOFTOSS_MODULE)
500 sound_free_dma(hw_config->dma);
503 for (i = 0; i < 2; i++)
504 free_page(dma_buf[i]);
505 sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
507 sound_unload_audiodev(adev);
512 static int __init probe_vidc(struct address_info *hw_config)
514 hw_config->irq = IRQ_DMAS0;
515 hw_config->dma = DMA_VIRTUAL_SOUND;
516 hw_config->dma2 = -1;
517 hw_config->card_subtype = 16;
518 hw_config->name = "VIDC20";
522 static void __exit unload_vidc(struct address_info *hw_config)
524 int i, adev = vidc_adev;
528 free_irq(hw_config->irq, &dma_start);
529 sound_free_dma(hw_config->dma);
532 sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
533 sound_unload_audiodev(adev);
534 for (i = 0; i < 2; i++)
535 free_page(dma_buf[i]);
539 static struct address_info cfg;
541 static int __init init_vidc(void)
543 if (probe_vidc(&cfg) == 0)
551 static void __exit cleanup_vidc(void)
556 module_init(init_vidc);
557 module_exit(cleanup_vidc);
559 MODULE_AUTHOR("Russell King");
560 MODULE_DESCRIPTION("VIDC20 audio driver");
561 MODULE_LICENSE("GPL");