aboutsummaryrefslogtreecommitdiff
path: root/sound/oss/vidc.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/oss/vidc.c')
-rw-r--r--sound/oss/vidc.c561
1 files changed, 561 insertions, 0 deletions
diff --git a/sound/oss/vidc.c b/sound/oss/vidc.c
new file mode 100644
index 00000000000..00fe5cec9dc
--- /dev/null
+++ b/sound/oss/vidc.c
@@ -0,0 +1,561 @@
+/*
+ * linux/drivers/sound/vidc.c
+ *
+ * Copyright (C) 1997-2000 by Russell King <rmk@arm.linux.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * VIDC20 audio driver.
+ *
+ * The VIDC20 sound hardware consists of the VIDC20 itself, a DAC and a DMA
+ * engine. The DMA transfers fixed-format (16-bit little-endian linear)
+ * samples to the VIDC20, which then transfers this data serially to the
+ * DACs. The samplerate is controlled by the VIDC.
+ *
+ * We currently support a mixer device, but it is currently non-functional.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+
+#include <asm/hardware.h>
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/hardware/iomd.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include "sound_config.h"
+#include "vidc.h"
+
+#ifndef _SIOC_TYPE
+#define _SIOC_TYPE(x) _IOC_TYPE(x)
+#endif
+#ifndef _SIOC_NR
+#define _SIOC_NR(x) _IOC_NR(x)
+#endif
+
+#define VIDC_SOUND_CLOCK (250000)
+#define VIDC_SOUND_CLOCK_EXT (176400)
+
+/*
+ * When using SERIAL SOUND mode (external DAC), the number of physical
+ * channels is fixed at 2.
+ */
+static int vidc_busy;
+static int vidc_adev;
+static int vidc_audio_rate;
+static char vidc_audio_format;
+static char vidc_audio_channels;
+
+static unsigned char vidc_level_l[SOUND_MIXER_NRDEVICES] = {
+ 85, /* master */
+ 50, /* bass */
+ 50, /* treble */
+ 0, /* synth */
+ 75, /* pcm */
+ 0, /* speaker */
+ 100, /* ext line */
+ 0, /* mic */
+ 100, /* CD */
+ 0,
+};
+
+static unsigned char vidc_level_r[SOUND_MIXER_NRDEVICES] = {
+ 85, /* master */
+ 50, /* bass */
+ 50, /* treble */
+ 0, /* synth */
+ 75, /* pcm */
+ 0, /* speaker */
+ 100, /* ext line */
+ 0, /* mic */
+ 100, /* CD */
+ 0,
+};
+
+static unsigned int vidc_audio_volume_l; /* left PCM vol, 0 - 65536 */
+static unsigned int vidc_audio_volume_r; /* right PCM vol, 0 - 65536 */
+
+extern void vidc_update_filler(int bits, int channels);
+extern int softoss_dev;
+
+static void
+vidc_mixer_set(int mdev, unsigned int level)
+{
+ unsigned int lev_l = level & 0x007f;
+ unsigned int lev_r = (level & 0x7f00) >> 8;
+ unsigned int mlev_l, mlev_r;
+
+ if (lev_l > 100)
+ lev_l = 100;
+ if (lev_r > 100)
+ lev_r = 100;
+
+#define SCALE(lev,master) ((lev) * (master) * 65536 / 10000)
+
+ mlev_l = vidc_level_l[SOUND_MIXER_VOLUME];
+ mlev_r = vidc_level_r[SOUND_MIXER_VOLUME];
+
+ switch (mdev) {
+ case SOUND_MIXER_VOLUME:
+ case SOUND_MIXER_PCM:
+ vidc_level_l[mdev] = lev_l;
+ vidc_level_r[mdev] = lev_r;
+
+ vidc_audio_volume_l = SCALE(lev_l, mlev_l);
+ vidc_audio_volume_r = SCALE(lev_r, mlev_r);
+/*printk("VIDC: PCM vol %05X %05X\n", vidc_audio_volume_l, vidc_audio_volume_r);*/
+ break;
+ }
+#undef SCALE
+}
+
+static int vidc_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
+{
+ unsigned int val;
+ unsigned int mdev;
+
+ if (_SIOC_TYPE(cmd) != 'M')
+ return -EINVAL;
+
+ mdev = _SIOC_NR(cmd);
+
+ if (_SIOC_DIR(cmd) & _SIOC_WRITE) {
+ if (get_user(val, (unsigned int __user *)arg))
+ return -EFAULT;
+
+ if (mdev < SOUND_MIXER_NRDEVICES)
+ vidc_mixer_set(mdev, val);
+ else
+ return -EINVAL;
+ }
+
+ /*
+ * Return parameters
+ */
+ switch (mdev) {
+ case SOUND_MIXER_RECSRC:
+ val = 0;
+ break;
+
+ case SOUND_MIXER_DEVMASK:
+ val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
+ break;
+
+ case SOUND_MIXER_STEREODEVS:
+ val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
+ break;
+
+ case SOUND_MIXER_RECMASK:
+ val = 0;
+ break;
+
+ case SOUND_MIXER_CAPS:
+ val = 0;
+ break;
+
+ default:
+ if (mdev < SOUND_MIXER_NRDEVICES)
+ val = vidc_level_l[mdev] | vidc_level_r[mdev] << 8;
+ else
+ return -EINVAL;
+ }
+
+ return put_user(val, (unsigned int __user *)arg) ? -EFAULT : 0;
+}
+
+static unsigned int vidc_audio_set_format(int dev, unsigned int fmt)
+{
+ switch (fmt) {
+ default:
+ fmt = AFMT_S16_LE;
+ case AFMT_U8:
+ case AFMT_S8:
+ case AFMT_S16_LE:
+ vidc_audio_format = fmt;
+ vidc_update_filler(vidc_audio_format, vidc_audio_channels);
+ case AFMT_QUERY:
+ break;
+ }
+ return vidc_audio_format;
+}
+
+#define my_abs(i) ((i)<0 ? -(i) : (i))
+
+static int vidc_audio_set_speed(int dev, int rate)
+{
+ if (rate) {
+ unsigned int hwctrl, hwrate, hwrate_ext, rate_int, rate_ext;
+ unsigned int diff_int, diff_ext;
+ unsigned int newsize, new2size;
+
+ hwctrl = 0x00000003;
+
+ /* Using internal clock */
+ hwrate = (((VIDC_SOUND_CLOCK * 2) / rate) + 1) >> 1;
+ if (hwrate < 3)
+ hwrate = 3;
+ if (hwrate > 255)
+ hwrate = 255;
+
+ /* Using exernal clock */
+ hwrate_ext = (((VIDC_SOUND_CLOCK_EXT * 2) / rate) + 1) >> 1;
+ if (hwrate_ext < 3)
+ hwrate_ext = 3;
+ if (hwrate_ext > 255)
+ hwrate_ext = 255;
+
+ rate_int = VIDC_SOUND_CLOCK / hwrate;
+ rate_ext = VIDC_SOUND_CLOCK_EXT / hwrate_ext;
+
+ /* Chose between external and internal clock */
+ diff_int = my_abs(rate_ext-rate);
+ diff_ext = my_abs(rate_int-rate);
+ if (diff_ext < diff_int) {
+ /*printk("VIDC: external %d %d %d\n", rate, rate_ext, hwrate_ext);*/
+ hwrate=hwrate_ext;
+ hwctrl=0x00000002;
+ /* Allow roughly 0.4% tolerance */
+ if (diff_ext > (rate/256))
+ rate=rate_ext;
+ } else {
+ /*printk("VIDC: internal %d %d %d\n", rate, rate_int, hwrate);*/
+ hwctrl=0x00000003;
+ /* Allow rougly 0.4% tolerance */
+ if (diff_int > (rate/256))
+ rate=rate_int;
+ }
+
+ vidc_writel(0xb0000000 | (hwrate - 2));
+ vidc_writel(0xb1000000 | hwctrl);
+
+ newsize = (10000 / hwrate) & ~3;
+ if (newsize < 208)
+ newsize = 208;
+ if (newsize > 4096)
+ newsize = 4096;
+ for (new2size = 128; new2size < newsize; new2size <<= 1);
+ if (new2size - newsize > newsize - (new2size >> 1))
+ new2size >>= 1;
+ if (new2size > 4096) {
+ printk(KERN_ERR "VIDC: error: dma buffer (%d) %d > 4K\n",
+ newsize, new2size);
+ new2size = 4096;
+ }
+ /*printk("VIDC: dma size %d\n", new2size);*/
+ dma_bufsize = new2size;
+ vidc_audio_rate = rate;
+ }
+ return vidc_audio_rate;
+}
+
+static short vidc_audio_set_channels(int dev, short channels)
+{
+ switch (channels) {
+ default:
+ channels = 2;
+ case 1:
+ case 2:
+ vidc_audio_channels = channels;
+ vidc_update_filler(vidc_audio_format, vidc_audio_channels);
+ case 0:
+ break;
+ }
+ return vidc_audio_channels;
+}
+
+/*
+ * Open the device
+ */
+static int vidc_audio_open(int dev, int mode)
+{
+ /* This audio device does not have recording capability */
+ if (mode == OPEN_READ)
+ return -EPERM;
+
+ if (vidc_busy)
+ return -EBUSY;
+
+ vidc_busy = 1;
+ return 0;
+}
+
+/*
+ * Close the device
+ */
+static void vidc_audio_close(int dev)
+{
+ vidc_busy = 0;
+}
+
+/*
+ * Output a block via DMA to sound device.
+ *
+ * We just set the DMA start and count; the DMA interrupt routine
+ * will take care of formatting the samples (via the appropriate
+ * vidc_filler routine), and flag via vidc_audio_dma_interrupt when
+ * more data is required.
+ */
+static void
+vidc_audio_output_block(int dev, unsigned long buf, int total_count, int one)
+{
+ struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
+ dma_count = total_count;
+ local_irq_restore(flags);
+}
+
+static void
+vidc_audio_start_input(int dev, unsigned long buf, int count, int intrflag)
+{
+}
+
+static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
+{
+ return -EINVAL;
+}
+
+static irqreturn_t vidc_audio_dma_interrupt(void)
+{
+ DMAbuf_outputintr(vidc_adev, 1);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Prepare for outputting samples.
+ *
+ * Each buffer that will be passed will be `bsize' bytes long,
+ * with a total of `bcount' buffers.
+ */
+static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
+{
+ struct audio_operations *adev = audio_devs[dev];
+
+ dma_interrupt = NULL;
+ adev->dmap_out->flags |= DMA_NODMA;
+
+ return 0;
+}
+
+/*
+ * Stop our current operation.
+ */
+static void vidc_audio_reset(int dev)
+{
+ dma_interrupt = NULL;
+}
+
+static int vidc_audio_local_qlen(int dev)
+{
+ return /*dma_count !=*/ 0;
+}
+
+static void vidc_audio_trigger(int dev, int enable_bits)
+{
+ struct audio_operations *adev = audio_devs[dev];
+
+ if (enable_bits & PCM_ENABLE_OUTPUT) {
+ if (!(adev->flags & DMA_ACTIVE)) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ /* prevent recusion */
+ adev->flags |= DMA_ACTIVE;
+
+ dma_interrupt = vidc_audio_dma_interrupt;
+ vidc_sound_dma_irq(0, NULL, NULL);
+ iomd_writeb(DMA_CR_E | 0x10, IOMD_SD0CR);
+
+ local_irq_restore(flags);
+ }
+ }
+}
+
+static struct audio_driver vidc_audio_driver =
+{
+ .owner = THIS_MODULE,
+ .open = vidc_audio_open,
+ .close = vidc_audio_close,
+ .output_block = vidc_audio_output_block,
+ .start_input = vidc_audio_start_input,
+ .prepare_for_input = vidc_audio_prepare_for_input,
+ .prepare_for_output = vidc_audio_prepare_for_output,
+ .halt_io = vidc_audio_reset,
+ .local_qlen = vidc_audio_local_qlen,
+ .trigger = vidc_audio_trigger,
+ .set_speed = vidc_audio_set_speed,
+ .set_bits = vidc_audio_set_format,
+ .set_channels = vidc_audio_set_channels
+};
+
+static struct mixer_operations vidc_mixer_operations = {
+ .owner = THIS_MODULE,
+ .id = "VIDC",
+ .name = "VIDCsound",
+ .ioctl = vidc_mixer_ioctl
+};
+
+void vidc_update_filler(int format, int channels)
+{
+#define TYPE(fmt,ch) (((fmt)<<2) | ((ch)&3))
+
+ switch (TYPE(format, channels)) {
+ default:
+ case TYPE(AFMT_U8, 1):
+ vidc_filler = vidc_fill_1x8_u;
+ break;
+
+ case TYPE(AFMT_U8, 2):
+ vidc_filler = vidc_fill_2x8_u;
+ break;
+
+ case TYPE(AFMT_S8, 1):
+ vidc_filler = vidc_fill_1x8_s;
+ break;
+
+ case TYPE(AFMT_S8, 2):
+ vidc_filler = vidc_fill_2x8_s;
+ break;
+
+ case TYPE(AFMT_S16_LE, 1):
+ vidc_filler = vidc_fill_1x16_s;
+ break;
+
+ case TYPE(AFMT_S16_LE, 2):
+ vidc_filler = vidc_fill_2x16_s;
+ break;
+ }
+}
+
+static void __init attach_vidc(struct address_info *hw_config)
+{
+ char name[32];
+ int i, adev;
+
+ sprintf(name, "VIDC %d-bit sound", hw_config->card_subtype);
+ conf_printf(name, hw_config);
+ memset(dma_buf, 0, sizeof(dma_buf));
+
+ adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION, name,
+ &vidc_audio_driver, sizeof(vidc_audio_driver),
+ DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
+ NULL, hw_config->dma, hw_config->dma2);
+
+ if (adev < 0)
+ goto audio_failed;
+
+ /*
+ * 1024 bytes => 64 buffers
+ */
+ audio_devs[adev]->min_fragment = 10;
+ audio_devs[adev]->mixer_dev = num_mixers;
+
+ audio_devs[adev]->mixer_dev =
+ sound_install_mixer(MIXER_DRIVER_VERSION,
+ name, &vidc_mixer_operations,
+ sizeof(vidc_mixer_operations), NULL);
+
+ if (audio_devs[adev]->mixer_dev < 0)
+ goto mixer_failed;
+
+ for (i = 0; i < 2; i++) {
+ dma_buf[i] = get_zeroed_page(GFP_KERNEL);
+ if (!dma_buf[i]) {
+ printk(KERN_ERR "%s: can't allocate required buffers\n",
+ name);
+ goto mem_failed;
+ }
+ dma_pbuf[i] = virt_to_phys((void *)dma_buf[i]);
+ }
+
+ if (sound_alloc_dma(hw_config->dma, hw_config->name)) {
+ printk(KERN_ERR "%s: DMA %d is in use\n", name, hw_config->dma);
+ goto dma_failed;
+ }
+
+ if (request_irq(hw_config->irq, vidc_sound_dma_irq, 0,
+ hw_config->name, &dma_start)) {
+ printk(KERN_ERR "%s: IRQ %d is in use\n", name, hw_config->irq);
+ goto irq_failed;
+ }
+ vidc_adev = adev;
+ vidc_mixer_set(SOUND_MIXER_VOLUME, (85 | 85 << 8));
+
+#if defined(CONFIG_SOUND_SOFTOSS) || defined(CONFIG_SOUND_SOFTOSS_MODULE)
+ softoss_dev = adev;
+#endif
+ return;
+
+irq_failed:
+ sound_free_dma(hw_config->dma);
+dma_failed:
+mem_failed:
+ for (i = 0; i < 2; i++)
+ free_page(dma_buf[i]);
+ sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
+mixer_failed:
+ sound_unload_audiodev(adev);
+audio_failed:
+ return;
+}
+
+static int __init probe_vidc(struct address_info *hw_config)
+{
+ hw_config->irq = IRQ_DMAS0;
+ hw_config->dma = DMA_VIRTUAL_SOUND;
+ hw_config->dma2 = -1;
+ hw_config->card_subtype = 16;
+ hw_config->name = "VIDC20";
+ return 1;
+}
+
+static void __exit unload_vidc(struct address_info *hw_config)
+{
+ int i, adev = vidc_adev;
+
+ vidc_adev = -1;
+
+ free_irq(hw_config->irq, &dma_start);
+ sound_free_dma(hw_config->dma);
+
+ if (adev >= 0) {
+ sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
+ sound_unload_audiodev(adev);
+ for (i = 0; i < 2; i++)
+ free_page(dma_buf[i]);
+ }
+}
+
+static struct address_info cfg;
+
+static int __init init_vidc(void)
+{
+ if (probe_vidc(&cfg) == 0)
+ return -ENODEV;
+
+ attach_vidc(&cfg);
+
+ return 0;
+}
+
+static void __exit cleanup_vidc(void)
+{
+ unload_vidc(&cfg);
+}
+
+module_init(init_vidc);
+module_exit(cleanup_vidc);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("VIDC20 audio driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 22:46:56 +0000