patch-1.3.34 linux/drivers/sound/ad1848.c
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- Lines: 1630
- Date:
Wed Oct 11 07:55:38 1995
- Orig file:
v1.3.33/linux/drivers/sound/ad1848.c
- Orig date:
Mon Aug 28 14:52:21 1995
diff -u --recursive --new-file v1.3.33/linux/drivers/sound/ad1848.c linux/drivers/sound/ad1848.c
@@ -10,7 +10,8 @@
* CS4231A and AD1845 are upward compatible with CS4231. However
* the new features of these chips are different.
*
- * CS4232 is a PnP audio chip which contains a CS4231A.
+ * CS4232 is a PnP audio chip which contains a CS4231A (and SB, MPU).
+ * CS4232A is an improved version of CS4232.
*
* Copyright by Hannu Savolainen 1994, 1995
*
@@ -47,17 +48,10 @@
#include "ad1848_mixer.h"
-#define IMODE_NONE 0
-#define IMODE_OUTPUT 1
-#define IMODE_INPUT 2
-#define IMODE_INIT 3
-#define IMODE_MIDI 4
-
typedef struct
{
int base;
int irq;
- int dma_capture, dma_playback;
int dual_dma; /* 1, when two DMA channels allocated */
unsigned char MCE_bit;
unsigned char saved_regs[16];
@@ -74,29 +68,42 @@
int opened;
char *chip_name;
int mode;
+#define MD_1848 1
+#define MD_4231 2
+#define MD_4231A 3
+#define MD_1845 4
/* Mixer parameters */
int recmask;
int supported_devices;
int supported_rec_devices;
unsigned short levels[32];
+ int dev_no;
+ volatile unsigned long timer_ticks;
+ int timer_running;
+ int irq_ok;
+ sound_os_info *osp;
}
ad1848_info;
static int nr_ad1848_devs = 0;
-static char irq2dev[16] =
+static volatile char irq2dev[17] =
{-1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1};
+ -1, -1, -1, -1, -1, -1, -1, -1, -1};
+
+static int timer_installed = -1;
static char mixer2codec[MAX_MIXER_DEV] =
{0};
-static int ad_format_mask[3 /*devc->mode */ ] =
+static int ad_format_mask[5 /*devc->mode */ ] =
{
0,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW,
- AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_U16_LE | AFMT_IMA_ADPCM
+ AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_U16_LE | AFMT_IMA_ADPCM,
+ AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_U16_LE | AFMT_IMA_ADPCM,
+ AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW /* AD1845 */
};
static ad1848_info dev_info[MAX_AUDIO_DEV];
@@ -108,13 +115,17 @@
static int ad1848_open (int dev, int mode);
static void ad1848_close (int dev);
-static int ad1848_ioctl (int dev, unsigned int cmd, unsigned int arg, int local);
+static int ad1848_ioctl (int dev, unsigned int cmd, ioctl_arg arg, int local);
static void ad1848_output_block (int dev, unsigned long buf, int count, int intrflag, int dma_restart);
static void ad1848_start_input (int dev, unsigned long buf, int count, int intrflag, int dma_restart);
static int ad1848_prepare_for_IO (int dev, int bsize, int bcount);
static void ad1848_reset (int dev);
static void ad1848_halt (int dev);
-void ad1848_interrupt (INT_HANDLER_PARMS (irq, dummy));
+static void ad1848_halt_input (int dev);
+static void ad1848_halt_output (int dev);
+static void ad1848_trigger (int dev, int bits);
+static int ad1848_tmr_install (int dev);
+static void ad1848_tmr_reprogram (int dev);
static int
ad_read (ad1848_info * devc, int reg)
@@ -123,14 +134,15 @@
int x;
int timeout = 900000;
- while (timeout > 0 && INB (devc->base) == 0x80) /*Are we initializing */
+ while (timeout > 0 && inb (devc->base) == 0x80) /*Are we initializing */
timeout--;
- DISABLE_INTR (flags);
- OUTB ((unsigned char) (reg & 0xff) | devc->MCE_bit, io_Index_Addr (devc));
- x = INB (io_Indexed_Data (devc));
+ save_flags (flags);
+ cli ();
+ outb ((unsigned char) (reg & 0xff) | devc->MCE_bit, io_Index_Addr (devc));
+ x = inb (io_Indexed_Data (devc));
/* printk("(%02x<-%02x) ", reg|devc->MCE_bit, x); */
- RESTORE_INTR (flags);
+ restore_flags (flags);
return x;
}
@@ -141,14 +153,15 @@
unsigned long flags;
int timeout = 90000;
- while (timeout > 0 && INB (devc->base) == 0x80) /*Are we initializing */
+ while (timeout > 0 && inb (devc->base) == 0x80) /*Are we initializing */
timeout--;
- DISABLE_INTR (flags);
- OUTB ((unsigned char) (reg & 0xff) | devc->MCE_bit, io_Index_Addr (devc));
- OUTB ((unsigned char) (data & 0xff), io_Indexed_Data (devc));
+ save_flags (flags);
+ cli ();
+ outb ((unsigned char) (reg & 0xff) | devc->MCE_bit, io_Index_Addr (devc));
+ outb ((unsigned char) (data & 0xff), io_Indexed_Data (devc));
/* printk("(%02x->%02x) ", reg|devc->MCE_bit, data); */
- RESTORE_INTR (flags);
+ restore_flags (flags);
}
static void
@@ -164,9 +177,9 @@
*/
timeout = 100000;
- while (timeout > 0 && INB (devc->base) & 0x80)
+ while (timeout > 0 && inb (devc->base) & 0x80)
timeout--;
- if (INB (devc->base) & 0x80)
+ if (inb (devc->base) & 0x80)
printk ("ad1848: Auto calibration timed out(1).\n");
timeout = 100;
@@ -219,21 +232,22 @@
int timeout = 1000;
unsigned short prev;
- while (timeout > 0 && INB (devc->base) == 0x80) /*Are we initializing */
+ while (timeout > 0 && inb (devc->base) == 0x80) /*Are we initializing */
timeout--;
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
devc->MCE_bit = 0x40;
- prev = INB (io_Index_Addr (devc));
+ prev = inb (io_Index_Addr (devc));
if (prev & 0x40)
{
- RESTORE_INTR (flags);
+ restore_flags (flags);
return;
}
- OUTB (devc->MCE_bit, io_Index_Addr (devc));
- RESTORE_INTR (flags);
+ outb (devc->MCE_bit, io_Index_Addr (devc));
+ restore_flags (flags);
}
static void
@@ -243,24 +257,25 @@
unsigned char prev;
int timeout = 1000;
- while (timeout > 0 && INB (devc->base) == 0x80) /*Are we initializing */
+ while (timeout > 0 && inb (devc->base) == 0x80) /*Are we initializing */
timeout--;
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
devc->MCE_bit = 0x00;
- prev = INB (io_Index_Addr (devc));
- OUTB (0x00, io_Index_Addr (devc)); /* Clear the MCE bit */
+ prev = inb (io_Index_Addr (devc));
+ outb (0x00, io_Index_Addr (devc)); /* Clear the MCE bit */
- if ((prev & 0x40) == 0) /* Not in MCE mode */
+ if ((prev & 0x40) == 0) /* Not in MCE mode */
{
- RESTORE_INTR (flags);
+ restore_flags (flags);
return;
}
- OUTB (0x00, io_Index_Addr (devc)); /* Clear the MCE bit */
+ outb (0x00, io_Index_Addr (devc)); /* Clear the MCE bit */
wait_for_calibration (devc);
- RESTORE_INTR (flags);
+ restore_flags (flags);
}
@@ -308,6 +323,10 @@
recdev = 1;
break;
+ case SOUND_MASK_IMIX:
+ recdev = 3;
+ break;
+
default:
mask = SOUND_MASK_MIC;
recdev = 2;
@@ -342,7 +361,7 @@
ad1848_mixer_get (ad1848_info * devc, int dev)
{
if (!((1 << dev) & devc->supported_devices))
- return RET_ERROR (EINVAL);
+ return -EINVAL;
return devc->levels[dev];
}
@@ -352,6 +371,7 @@
{
int left = value & 0x000000ff;
int right = (value & 0x0000ff00) >> 8;
+ int retvol;
int regoffs;
unsigned char val;
@@ -361,14 +381,29 @@
if (right > 100)
right = 100;
+ if (mix_devices[dev][RIGHT_CHN].nbits == 0) /* Mono control */
+ right = left;
+
+ retvol = left | (left << 8);
+
+ /* Scale volumes */
+ left = mix_cvt[left];
+ right = mix_cvt[right];
+
+ /* Scale it again */
+ left = mix_cvt[left];
+ right = mix_cvt[right];
+
if (dev > 31)
- return RET_ERROR (EINVAL);
+ return -EINVAL;
if (!(devc->supported_devices & (1 << dev)))
- return RET_ERROR (EINVAL);
+ return -EINVAL;
if (mix_devices[dev][LEFT_CHN].nbits == 0)
- return RET_ERROR (EINVAL);
+ return -EINVAL;
+
+ devc->levels[dev] = retvol;
/*
* Set the left channel
@@ -377,16 +412,15 @@
regoffs = mix_devices[dev][LEFT_CHN].regno;
val = ad_read (devc, regoffs);
change_bits (&val, dev, LEFT_CHN, left);
- devc->levels[dev] = left | (left << 8);
ad_write (devc, regoffs, val);
devc->saved_regs[regoffs] = val;
/*
- * Set the left right
+ * Set the right channel
*/
if (mix_devices[dev][RIGHT_CHN].nbits == 0)
- return left | (left << 8); /* Was just a mono channel */
+ return retvol; /* Was just a mono channel */
regoffs = mix_devices[dev][RIGHT_CHN].regno;
val = ad_read (devc, regoffs);
@@ -394,8 +428,7 @@
ad_write (devc, regoffs, val);
devc->saved_regs[regoffs] = val;
- devc->levels[dev] = left | (right << 8);
- return left | (right << 8);
+ return retvol;
}
static void
@@ -404,7 +437,7 @@
int i;
devc->recmask = 0;
- if (devc->mode == 2)
+ if (devc->mode != MD_1848)
devc->supported_devices = MODE2_MIXER_DEVICES;
else
devc->supported_devices = MODE1_MIXER_DEVICES;
@@ -412,19 +445,20 @@
devc->supported_rec_devices = MODE1_REC_DEVICES;
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
- ad1848_mixer_set (devc, i, devc->levels[i] = default_mixer_levels[i]);
+ if (devc->supported_devices & (1 << i))
+ ad1848_mixer_set (devc, i, default_mixer_levels[i]);
ad1848_set_recmask (devc, SOUND_MASK_MIC);
}
static int
-ad1848_mixer_ioctl (int dev, unsigned int cmd, unsigned int arg)
+ad1848_mixer_ioctl (int dev, unsigned int cmd, ioctl_arg arg)
{
ad1848_info *devc;
int codec_dev = mixer2codec[dev];
if (!codec_dev)
- return RET_ERROR (ENXIO);
+ return -ENXIO;
codec_dev--;
@@ -436,11 +470,11 @@
switch (cmd & 0xff)
{
case SOUND_MIXER_RECSRC:
- return IOCTL_OUT (arg, ad1848_set_recmask (devc, IOCTL_IN (arg)));
+ return snd_ioctl_return ((int *) arg, ad1848_set_recmask (devc, get_fs_long ((long *) arg)));
break;
default:
- return IOCTL_OUT (arg, ad1848_mixer_set (devc, cmd & 0xff, IOCTL_IN (arg)));
+ return snd_ioctl_return ((int *) arg, ad1848_mixer_set (devc, cmd & 0xff, get_fs_long ((long *) arg)));
}
else
switch (cmd & 0xff) /*
@@ -449,32 +483,31 @@
{
case SOUND_MIXER_RECSRC:
- return IOCTL_OUT (arg, devc->recmask);
+ return snd_ioctl_return ((int *) arg, devc->recmask);
break;
case SOUND_MIXER_DEVMASK:
- return IOCTL_OUT (arg, devc->supported_devices);
+ return snd_ioctl_return ((int *) arg, devc->supported_devices);
break;
case SOUND_MIXER_STEREODEVS:
- return IOCTL_OUT (arg, devc->supported_devices &
- ~(SOUND_MASK_SPEAKER | SOUND_MASK_IMIX));
+ return snd_ioctl_return ((int *) arg, devc->supported_devices & ~(SOUND_MASK_SPEAKER | SOUND_MASK_IMIX));
break;
case SOUND_MIXER_RECMASK:
- return IOCTL_OUT (arg, devc->supported_rec_devices);
+ return snd_ioctl_return ((int *) arg, devc->supported_rec_devices);
break;
case SOUND_MIXER_CAPS:
- return IOCTL_OUT (arg, SOUND_CAP_EXCL_INPUT);
+ return snd_ioctl_return ((int *) arg, SOUND_CAP_EXCL_INPUT);
break;
default:
- return IOCTL_OUT (arg, ad1848_mixer_get (devc, cmd & 0xff));
+ return snd_ioctl_return ((int *) arg, ad1848_mixer_get (devc, cmd & 0xff));
}
}
else
- return RET_ERROR (EINVAL);
+ return -EINVAL;
}
static struct audio_operations ad1848_pcm_operations[MAX_AUDIO_DEV] =
@@ -494,7 +527,10 @@
ad1848_reset,
ad1848_halt,
NULL,
- NULL
+ NULL,
+ ad1848_halt_input,
+ ad1848_halt_output,
+ ad1848_trigger
}};
static struct mixer_operations ad1848_mixer_operations =
@@ -506,71 +542,35 @@
static int
ad1848_open (int dev, int mode)
{
- int err;
ad1848_info *devc = NULL;
unsigned long flags;
- DEB (printk ("ad1848_open(int mode = %X)\n", mode));
-
if (dev < 0 || dev >= num_audiodevs)
- return RET_ERROR (ENXIO);
+ return -ENXIO;
devc = (ad1848_info *) audio_devs[dev]->devc;
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
if (devc->opened)
{
- RESTORE_INTR (flags);
+ restore_flags (flags);
printk ("ad1848: Already opened\n");
- return RET_ERROR (EBUSY);
+ return -EBUSY;
}
- if (devc->irq) /* Not managed by another driver */
- if ((err = snd_set_irq_handler (devc->irq, ad1848_interrupt,
- audio_devs[dev]->name)) < 0)
- {
- printk ("ad1848: IRQ in use\n");
- RESTORE_INTR (flags);
- return err;
- }
-
-/*
- * Allocate DMA
- */
-
- if (mode & OPEN_WRITE)
- audio_devs[dev]->dmachan = devc->dma_playback;
- else
- audio_devs[dev]->dmachan = devc->dma_capture;
-
- if (DMAbuf_open_dma (dev) < 0)
- {
- RESTORE_INTR (flags);
- if (devc->irq) /* Don't leave IRQ reserved */
- snd_release_irq (devc->irq);
-
- printk ("ad1848: DMA in use\n");
- return RET_ERROR (EBUSY);
- }
devc->dual_dma = 0;
- if (devc->dma_capture != devc->dma_playback && mode == OPEN_READWRITE)
+ if (audio_devs[dev]->flags & DMA_DUPLEX)
{
devc->dual_dma = 1;
-
- if (ALLOC_DMA_CHN (devc->dma_capture, "Sound System (capture)"))
- {
- if (devc->irq) /* Don't leave IRQ reserved */
- snd_release_irq (devc->irq);
- DMAbuf_close_dma (dev);
- return RET_ERROR (EBUSY);
- }
}
devc->intr_active = 0;
devc->opened = 1;
- RESTORE_INTR (flags);
+ devc->irq_mode = 0;
+ restore_flags (flags);
/*
* Mute output until the playback really starts. This decreases clicking.
*/
@@ -587,26 +587,18 @@
DEB (printk ("ad1848_close(void)\n"));
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
devc->intr_active = 0;
- if (devc->irq) /* Not managed by another driver */
- snd_release_irq (devc->irq);
ad1848_reset (dev);
- DMAbuf_close_dma (dev);
- if (devc->dual_dma) /* Release the second DMA channel */
- {
- if (audio_devs[dev]->dmachan == devc->dma_playback)
- RELEASE_DMA_CHN (devc->dma_capture);
- else
- RELEASE_DMA_CHN (devc->dma_playback);
- }
devc->opened = 0;
+ devc->irq_mode = 0;
ad_unmute (devc);
- RESTORE_INTR (flags);
+ restore_flags (flags);
}
static int
@@ -650,6 +642,18 @@
n = sizeof (speed_table) / sizeof (speed_struct);
+ if (devc->mode == MD_1845) /* AD1845 has different timer than others */
+ {
+ if (arg < 4000)
+ arg = 4000;
+ if (arg > 50000)
+ arg = 50000;
+
+ devc->speed = arg;
+ devc->speed_bits = speed_table[selected].bits;
+ return devc->speed;
+ }
+
if (arg < speed_table[0].speed)
selected = 0;
if (arg > speed_table[n - 1].speed)
@@ -765,7 +769,7 @@
}
static int
-ad1848_ioctl (int dev, unsigned int cmd, unsigned int arg, int local)
+ad1848_ioctl (int dev, unsigned int cmd, ioctl_arg arg, int local)
{
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
@@ -773,42 +777,42 @@
{
case SOUND_PCM_WRITE_RATE:
if (local)
- return set_speed (devc, arg);
- return IOCTL_OUT (arg, set_speed (devc, IOCTL_IN (arg)));
+ return set_speed (devc, (int) arg);
+ return snd_ioctl_return ((int *) arg, set_speed (devc, get_fs_long ((long *) arg)));
case SOUND_PCM_READ_RATE:
if (local)
return devc->speed;
- return IOCTL_OUT (arg, devc->speed);
+ return snd_ioctl_return ((int *) arg, devc->speed);
case SNDCTL_DSP_STEREO:
if (local)
- return set_channels (devc, arg + 1) - 1;
- return IOCTL_OUT (arg, set_channels (devc, IOCTL_IN (arg) + 1) - 1);
+ return set_channels (devc, (int) arg + 1) - 1;
+ return snd_ioctl_return ((int *) arg, set_channels (devc, get_fs_long ((long *) arg) + 1) - 1);
case SOUND_PCM_WRITE_CHANNELS:
if (local)
- return set_channels (devc, arg);
- return IOCTL_OUT (arg, set_channels (devc, IOCTL_IN (arg)));
+ return set_channels (devc, (int) arg);
+ return snd_ioctl_return ((int *) arg, set_channels (devc, get_fs_long ((long *) arg)));
case SOUND_PCM_READ_CHANNELS:
if (local)
return devc->channels;
- return IOCTL_OUT (arg, devc->channels);
+ return snd_ioctl_return ((int *) arg, devc->channels);
case SNDCTL_DSP_SAMPLESIZE:
if (local)
- return set_format (devc, arg);
- return IOCTL_OUT (arg, set_format (devc, IOCTL_IN (arg)));
+ return set_format (devc, (int) arg);
+ return snd_ioctl_return ((int *) arg, set_format (devc, get_fs_long ((long *) arg)));
case SOUND_PCM_READ_BITS:
if (local)
return devc->audio_format;
- return IOCTL_OUT (arg, devc->audio_format);
+ return snd_ioctl_return ((int *) arg, devc->audio_format);
default:;
}
- return RET_ERROR (EINVAL);
+ return -EINVAL;
}
static void
@@ -819,8 +823,6 @@
cnt = count;
- audio_devs[dev]->dmachan = devc->dma_playback;
-
if (devc->audio_format == AFMT_IMA_ADPCM)
{
cnt /= 4;
@@ -834,17 +836,18 @@
cnt >>= 1;
cnt--;
- if (audio_devs[dev]->flags & DMA_AUTOMODE &&
+ if (devc->irq_mode & PCM_ENABLE_OUTPUT && audio_devs[dev]->flags & DMA_AUTOMODE &&
intrflag &&
cnt == devc->xfer_count)
{
- devc->irq_mode = IMODE_OUTPUT;
+ devc->irq_mode |= PCM_ENABLE_OUTPUT;
devc->intr_active = 1;
return; /*
* Auto DMA mode on. No need to react
*/
}
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
if (dma_restart)
{
@@ -852,39 +855,16 @@
DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE);
}
- ad_enter_MCE (devc);
-
ad_write (devc, 15, (unsigned char) (cnt & 0xff));
ad_write (devc, 14, (unsigned char) ((cnt >> 8) & 0xff));
- if (devc->dma_playback == devc->dma_capture)
- {
- ad_write (devc, 9, 0x0d); /*
- * Playback enable, single DMA channel mode,
- * auto calibration on.
- */
- }
- else
- {
- ad_write (devc, 9, 0x09); /*
- * Playback enable, dual DMA channel mode.
- * auto calibration on.
- */
- }
-
- ad_leave_MCE (devc); /*
- * Starts the calibration process and
- * enters playback mode after it.
- */
+ /* ad_write (devc, 9, ad_read (devc, 9) | 0x01); *//* Playback enable */
ad_unmute (devc);
devc->xfer_count = cnt;
- devc->irq_mode = IMODE_OUTPUT;
+ devc->irq_mode |= PCM_ENABLE_OUTPUT;
devc->intr_active = 1;
- INB (io_Status (devc));
- OUTB (0, io_Status (devc)); /* Clear pending interrupts */
- RESTORE_INTR (flags);
-
+ restore_flags (flags);
}
static void
@@ -893,8 +873,6 @@
unsigned long flags, cnt;
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
- audio_devs[dev]->dmachan = devc->dma_capture;
-
cnt = count;
if (devc->audio_format == AFMT_IMA_ADPCM)
{
@@ -909,17 +887,18 @@
cnt >>= 1;
cnt--;
- if (audio_devs[dev]->flags & DMA_AUTOMODE &&
+ if (devc->irq_mode & PCM_ENABLE_INPUT && audio_devs[dev]->flags & DMA_AUTOMODE &&
intrflag &&
cnt == devc->xfer_count)
{
- devc->irq_mode = IMODE_INPUT;
+ devc->irq_mode |= PCM_ENABLE_INPUT;
devc->intr_active = 1;
return; /*
* Auto DMA mode on. No need to react
*/
}
- DISABLE_INTR (flags);
+ save_flags (flags);
+ cli ();
if (dma_restart)
{
@@ -927,71 +906,73 @@
DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ);
}
- ad_enter_MCE (devc);
-
- if (devc->dma_playback == devc->dma_capture) /* Single DMA channel mode */
+ if (devc->mode == MD_1848 || !devc->dual_dma) /* Single DMA channel mode */
{
ad_write (devc, 15, (unsigned char) (cnt & 0xff));
ad_write (devc, 14, (unsigned char) ((cnt >> 8) & 0xff));
-
- ad_write (devc, 9, 0x0e); /*
- * Capture enable, single DMA channel mode,
- * auto calibration on.
- */
}
else
/* Dual DMA channel mode */
{
ad_write (devc, 31, (unsigned char) (cnt & 0xff));
ad_write (devc, 30, (unsigned char) ((cnt >> 8) & 0xff));
-
- ad_write (devc, 9, 0x0a); /*
- * Capture enable, dual DMA channel mode,
- * auto calibration on.
- */
}
- ad_leave_MCE (devc); /*
- * Starts the calibration process and
- * enters playback mode after it.
- */
+ /* ad_write (devc, 9, ad_read (devc, 9) | 0x02); *//* Capture enable */
ad_unmute (devc);
devc->xfer_count = cnt;
- devc->irq_mode = IMODE_INPUT;
+ devc->irq_mode |= PCM_ENABLE_INPUT;
devc->intr_active = 1;
- INB (io_Status (devc));
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
- RESTORE_INTR (flags);
+ restore_flags (flags);
}
static int
ad1848_prepare_for_IO (int dev, int bsize, int bcount)
{
int timeout;
- unsigned char fs;
+ unsigned char fs, old_fs;
unsigned long flags;
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
- DISABLE_INTR (flags);
- ad_enter_MCE (devc); /* Enables changes to the format select reg */
+ if (devc->irq_mode)
+ return 0;
+
+ save_flags (flags);
+ cli ();
fs = devc->speed_bits | (devc->format_bits << 5);
if (devc->channels > 1)
fs |= 0x10;
+ if (devc->mode == MD_1845) /* Use alternate speed select registers */
+ {
+ fs &= 0xf0; /* Mask off the rate select bits */
+
+ ad_write (devc, 22, (devc->speed >> 8) & 0xff); /* Speed MSB */
+ ad_write (devc, 23, devc->speed & 0xff); /* Speed LSB */
+ }
+
+ if (fs == (old_fs = ad_read (devc, 8))) /* No change */
+ {
+ restore_flags (flags);
+ devc->xfer_count = 0;
+ return 0;
+ }
+
+ ad_enter_MCE (devc); /* Enables changes to the format select reg */
ad_write (devc, 8, fs);
/*
* Write to I8 starts resyncronization. Wait until it completes.
*/
timeout = 10000;
- while (timeout > 0 && INB (devc->base) == 0x80)
+ while (timeout > 0 && inb (devc->base) == 0x80)
timeout--;
/*
* If mode == 2 (CS4231), set I28 also. It's the capture format register.
*/
- if (devc->mode == 2)
+ if (devc->mode != MD_1848)
{
ad_write (devc, 28, fs);
@@ -999,7 +980,7 @@
* Write to I28 starts resyncronization. Wait until it completes.
*/
timeout = 10000;
- while (timeout > 0 && INB (devc->base) == 0x80)
+ while (timeout > 0 && inb (devc->base) == 0x80)
timeout--;
}
@@ -1007,8 +988,16 @@
ad_leave_MCE (devc); /*
* Starts the calibration process.
*/
- RESTORE_INTR (flags);
+ restore_flags (flags);
devc->xfer_count = 0;
+
+#ifndef EXCLUDE_SEQUENCER
+ if (dev == timer_installed && devc->timer_running)
+ if ((fs & 0x01) != (old_fs & 0x01))
+ {
+ ad1848_tmr_reprogram (dev);
+ }
+#endif
return 0;
}
@@ -1022,17 +1011,18 @@
ad1848_halt (int dev)
{
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+ unsigned long flags;
+
+ save_flags (flags);
+ cli ();
ad_mute (devc);
ad_write (devc, 9, ad_read (devc, 9) & ~0x03); /* Stop DMA */
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
- ad_enter_MCE (devc);
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
ad_write (devc, 15, 0); /* Clear DMA counter */
ad_write (devc, 14, 0); /* Clear DMA counter */
- if (devc->mode == 2)
+ if (devc->mode != MD_1848)
{
ad_write (devc, 30, 0); /* Clear DMA counter */
ad_write (devc, 31, 0); /* Clear DMA counter */
@@ -1040,15 +1030,85 @@
ad_write (devc, 9, ad_read (devc, 9) & ~0x03); /* Stop DMA */
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
- ad_leave_MCE (devc);
+ outb (0, io_Status (devc)); /* Clear interrupt status */
+ outb (0, io_Status (devc)); /* Clear interrupt status */
+ devc->irq_mode = 0;
/* DMAbuf_reset_dma (dev); */
+ restore_flags (flags);
+}
+
+static void
+ad1848_halt_input (int dev)
+{
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+ unsigned long flags;
+
+ if (devc->mode == MD_1848)
+ {
+ ad1848_halt (dev);
+ return;
+ }
+
+ save_flags (flags);
+ cli ();
+
+ ad_mute (devc);
+ ad_write (devc, 9, ad_read (devc, 9) & ~0x02); /* Stop capture */
+
+
+ devc->irq_mode &= ~PCM_ENABLE_INPUT;
+
+ restore_flags (flags);
+}
+
+static void
+ad1848_halt_output (int dev)
+{
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+ unsigned long flags;
+
+ if (devc->mode == MD_1848)
+ {
+ ad1848_halt (dev);
+ return;
+ }
+
+ save_flags (flags);
+ cli ();
+
+ ad_mute (devc);
+ ad_write (devc, 9, ad_read (devc, 9) & ~0x01); /* Stop playback */
+
+
+ devc->irq_mode &= ~PCM_ENABLE_OUTPUT;
+
+ restore_flags (flags);
+}
+
+static void
+ad1848_trigger (int dev, int state)
+{
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+ unsigned long flags;
+ unsigned char tmp;
+
+ save_flags (flags);
+ cli ();
+ state &= devc->irq_mode;
+
+ tmp = ad_read (devc, 9) & ~0x03;
+ if (state & PCM_ENABLE_INPUT)
+ tmp |= 0x02;
+ if (state & PCM_ENABLE_OUTPUT)
+ tmp |= 0x01;
+ ad_write (devc, 9, tmp);
+
+ restore_flags (flags);
}
int
-ad1848_detect (int io_base)
+ad1848_detect (int io_base, int *ad_flags, sound_os_info * osp)
{
unsigned char tmp;
@@ -1056,20 +1116,29 @@
ad1848_info *devc = &dev_info[nr_ad1848_devs];
unsigned char tmp1 = 0xff, tmp2 = 0xff;
+ if (ad_flags)
+ *ad_flags = 0;
+
if (nr_ad1848_devs >= MAX_AUDIO_DEV)
{
DDB (printk ("ad1848 detect error - step 0\n"));
return 0;
}
+ if (check_region (io_base, 4))
+ {
+ printk ("\n\nad1848.c: Port %x not free.\n\n", io_base);
+ return 0;
+ }
devc->base = io_base;
+ devc->irq_ok = 0;
+ devc->timer_running = 0;
devc->MCE_bit = 0x40;
devc->irq = 0;
- devc->dma_capture = 0;
- devc->dma_playback = 0;
devc->opened = 0;
devc->chip_name = "AD1848";
- devc->mode = 1; /* MODE1 = original AD1848 */
+ devc->mode = MD_1848; /* AD1848 or CS4248 */
+ devc->osp = osp;
/*
* Check that the I/O address is in use.
@@ -1080,10 +1149,10 @@
*
* If the I/O address is unused, it typically returns 0xff.
*/
-
- if ((INB (devc->base) & 0x80) != 0x00) /* Not a AD1884 */
+ if ((inb (devc->base) & 0x80) != 0x00) /* Not a AD1848 */
{
- DDB (printk ("ad1848 detect error - step A\n"));
+ DDB (printk ("ad1848 detect error - step A (%02x)\n",
+ inb (devc->base)));
return 0;
}
@@ -1155,7 +1224,12 @@
tmp1 = ad_read (devc, 12);
if (tmp1 & 0x80)
- devc->chip_name = "CS4248"; /* Our best knowledge just now */
+ {
+ if (ad_flags)
+ *ad_flags |= AD_F_CS4248;
+
+ devc->chip_name = "CS4248"; /* Our best knowledge just now */
+ }
if ((tmp1 & 0xc0) == (0x80 | 0x40))
{
@@ -1185,6 +1259,8 @@
ad_write (devc, 25, ~tmp1); /* Invert all bits */
if ((ad_read (devc, 25) & 0xe7) == (tmp1 & 0xe7))
{
+ int id;
+
/*
* It's at least CS4231
*/
@@ -1193,7 +1269,7 @@
#ifdef MOZART_PORT
if (devc->base != MOZART_PORT + 4)
#endif
- devc->mode = 2;
+ devc->mode = MD_4231;
/*
* It could be an AD1845 or CS4231A as well.
@@ -1201,41 +1277,69 @@
* while the CS4231A reports different.
*/
- if ((ad_read (devc, 25) & 0xe7) == 0xa0)
+ id = ad_read (devc, 25) & 0xe7;
+
+ switch (id)
{
+
+ case 0xa0:
devc->chip_name = "CS4231A";
- }
- else if ((ad_read (devc, 25) & 0xe7) == 0x80)
- {
- /*
- * It must be a CS4231 or AD1845. The register I23 of
- * CS4231 is undefined and it appears to be read only.
- * AD1845 uses I23 for setting sample rate. Assume
- * the chip is AD1845 if I23 is changeable.
- */
-
- unsigned char tmp = ad_read (devc, 23);
-
- ad_write (devc, 23, ~tmp);
- if (ad_read (devc, 23) != tmp) /* AD1845 ? */
- {
- devc->chip_name = "AD1845";
- }
+ devc->mode = MD_4231A;
+ break;
- ad_write (devc, 23, tmp); /* Restore */
- }
+ case 0xa2:
+ devc->chip_name = "CS4232";
+ devc->mode = MD_4231A;
+ break;
+
+ case 0xb2:
+ devc->chip_name = "CS4232A";
+ devc->mode = MD_4231A;
+ break;
+
+ case 0x80:
+ {
+ /*
+ * It must be a CS4231 or AD1845. The register I23 of
+ * CS4231 is undefined and it appears to be read only.
+ * AD1845 uses I23 for setting sample rate. Assume
+ * the chip is AD1845 if I23 is changeable.
+ */
+
+ unsigned char tmp = ad_read (devc, 23);
+
+ ad_write (devc, 23, ~tmp);
+ if (ad_read (devc, 23) != tmp) /* AD1845 ? */
+ {
+ devc->chip_name = "AD1845";
+ devc->mode = MD_1845;
+ }
+
+ ad_write (devc, 23, tmp); /* Restore */
+ }
+ break;
- /* Otherwise behave just as if the chip is a CS4231 */
+ default: /* Assume CS4231 */
+ devc->mode = MD_4231;
+
+ }
}
ad_write (devc, 25, tmp1); /* Restore bits */
+
}
}
+ if (ad_flags)
+ {
+ if (devc->mode != MD_1848)
+ *ad_flags |= AD_F_CS4231;
+ }
+
return 1;
}
void
-ad1848_init (char *name, int io_base, int irq, int dma_playback, int dma_capture)
+ad1848_init (char *name, int io_base, int irq, int dma_playback, int dma_capture, int share_dma, sound_os_info * osp)
{
/*
* NOTE! If irq < 0, there is another driver which has allocated the IRQ
@@ -1249,7 +1353,7 @@
static int init_values[] =
{
0xa8, 0xa8, 0x08, 0x08, 0x08, 0x08, 0x80, 0x80,
- 0x00, 0x08, 0x02, 0x00, 0x8a, 0x01, 0x00, 0x00,
+ 0x00, 0x0c, 0x02, 0x00, 0x8a, 0x01, 0x00, 0x00,
/* Positions 16 to 31 just for CS4231 */
0x80, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,
@@ -1258,18 +1362,15 @@
int i, my_dev;
ad1848_info *devc = &dev_info[nr_ad1848_devs];
- if (!ad1848_detect (io_base))
+ if (!ad1848_detect (io_base, NULL, osp))
return;
- devc->irq = (irq > 0) ? irq : 0;
- devc->dma_playback = dma_playback;
-
- if (devc->mode == 2)
- devc->dma_capture = dma_capture;
- else
- devc->dma_capture = dma_playback; /* Use just single DMA */
+ request_region (devc->base, 4, devc->chip_name);
+ devc->irq = (irq > 0) ? irq : 0;
devc->opened = 0;
+ devc->timer_ticks = 0;
+ devc->osp = osp;
if (nr_ad1848_devs != 0)
{
@@ -1284,16 +1385,35 @@
ad_mute (devc); /* Initialize some variables */
ad_unmute (devc); /* Leave it unmuted now */
- if (devc->mode == 2)
+ if (devc->mode > MD_1848)
{
+ if (dma_capture == dma_playback || dma_capture == -1 || dma_playback == -1)
+ {
+ ad_write (devc, 9, ad_read (devc, 9) | 0x04); /* Single DMA mode */
+ ad1848_pcm_operations[nr_ad1848_devs].flags &= ~DMA_DUPLEX;
+ }
+ else
+ {
+ ad_write (devc, 9, ad_read (devc, 9) & ~0x04); /* Dual DMA mode */
+ ad1848_pcm_operations[nr_ad1848_devs].flags |= DMA_DUPLEX;
+ }
+
ad_write (devc, 12, ad_read (devc, 12) | 0x40); /* Mode2 = enabled */
for (i = 16; i < 32; i++)
ad_write (devc, i, init_values[i]);
+
+ if (devc->mode == MD_4231A)
+ ad_write (devc, 9, init_values[9] | 0x18); /* Enable full calibration */
+
+ if (devc->mode == MD_1845)
+ ad_write (devc, 27, init_values[27] | 0x08); /* Alternate freq select enabled */
}
+ else
+ ad_write (devc, 9, ad_read (devc, 9) | 0x04); /* Single DMA mode */
- OUTB (0, io_Status (devc)); /* Clear pending interrupts */
+ outb (0, io_Status (devc)); /* Clear pending interrupts */
- if (name[0] != 0)
+ if (name != NULL && name[0] != 0)
sprintf (ad1848_pcm_operations[nr_ad1848_devs].name,
"%s (%s)", name, devc->chip_name);
else
@@ -1306,17 +1426,68 @@
{
audio_devs[my_dev = num_audiodevs++] = &ad1848_pcm_operations[nr_ad1848_devs];
if (irq > 0)
- irq2dev[irq] = my_dev;
+ {
+ audio_devs[my_dev]->devc = devc;
+ irq2dev[irq] = my_dev;
+ if (snd_set_irq_handler (devc->irq, ad1848_interrupt,
+ audio_devs[my_dev]->name,
+ devc->osp) < 0)
+ {
+ printk ("ad1848: IRQ in use\n");
+ }
+
+#ifdef NO_IRQ_TEST
+ if (devc->mode != MD_1848)
+ {
+ int x;
+ unsigned char tmp = ad_read (devc, 16);
+
+ devc->timer_ticks = 0;
+
+ ad_write (devc, 21, 0x00); /* Timer msb */
+ ad_write (devc, 20, 0x10); /* Timer lsb */
+
+ ad_write (devc, 16, tmp | 0x40); /* Enable timer */
+ for (x = 0; x < 100000 && devc->timer_ticks == 0; x++);
+ ad_write (devc, 16, tmp & ~0x40); /* Disable timer */
+
+ if (devc->timer_ticks == 0)
+ printk ("[IRQ conflict???]");
+ else
+ devc->irq_ok = 1;
+
+ }
+ else
+ devc->irq_ok = 1; /* Couldn't test. assume it's OK */
+#else
+ devc->irq_ok = 1;
+#endif
+ }
else if (irq < 0)
- irq2dev[-irq] = my_dev;
+ irq2dev[-irq] = devc->dev_no = my_dev;
- audio_devs[my_dev]->dmachan = dma_playback;
- audio_devs[my_dev]->buffcount = 1;
- audio_devs[my_dev]->buffsize = DSP_BUFFSIZE * 2;
+ audio_devs[my_dev]->dmachan1 = dma_playback;
+ audio_devs[my_dev]->dmachan2 = dma_capture;
+ audio_devs[my_dev]->buffsize = DSP_BUFFSIZE;
audio_devs[my_dev]->devc = devc;
audio_devs[my_dev]->format_mask = ad_format_mask[devc->mode];
nr_ad1848_devs++;
+#ifndef EXCLUDE_SEQUENCER
+ if (devc->mode != MD_1848 && devc->irq_ok)
+ ad1848_tmr_install (my_dev);
+#endif
+
+ if (!share_dma)
+ {
+ if (sound_alloc_dma (dma_playback, "Sound System"))
+ printk ("ad1848.c: Can't allocate DMA%d\n", dma_playback);
+
+ if (dma_capture != dma_playback)
+ if (sound_alloc_dma (dma_capture, "Sound System (capture)"))
+ printk ("ad1848.c: Can't allocate DMA%d\n", dma_capture);
+ }
+
/*
* Toggle the MCE bit. It completes the initialization phase.
*/
@@ -1337,43 +1508,107 @@
}
void
-ad1848_interrupt (INT_HANDLER_PARMS (irq, dummy))
+ad1848_unload (int io_base, int irq, int dma_playback, int dma_capture, int share_dma)
+{
+ int i, dev = 0;
+ ad1848_info *devc = NULL;
+
+ for (i = 0; devc == NULL && nr_ad1848_devs; i++)
+ if (dev_info[i].base == io_base)
+ {
+ devc = &dev_info[i];
+ dev = devc->dev_no;
+ }
+
+ if (devc != NULL)
+ {
+ release_region (devc->base, 4);
+
+ if (!share_dma)
+ {
+ if (irq > 0)
+ snd_release_irq (devc->irq);
+
+ sound_free_dma (audio_devs[dev]->dmachan1);
+
+ if (audio_devs[dev]->dmachan2 != audio_devs[dev]->dmachan1)
+ sound_free_dma (audio_devs[dev]->dmachan2);
+ }
+ }
+ else
+ printk ("ad1848: Can't find device to be undoaded. Base=%x\n",
+ io_base);
+}
+
+void
+ad1848_interrupt (int irq, struct pt_regs *dummy)
{
unsigned char status;
ad1848_info *devc;
int dev;
if (irq < 0 || irq > 15)
- return; /* Bogus irq */
- dev = irq2dev[irq];
+ {
+ dev = -1;
+ }
+ else
+ dev = irq2dev[irq];
+
if (dev < 0 || dev >= num_audiodevs)
- return; /* Bogus dev */
+ {
+ for (irq = 0; irq < 17; irq++)
+ if (irq2dev[irq] != -1)
+ break;
- devc = (ad1848_info *) audio_devs[dev]->devc;
- status = INB (io_Status (devc));
+ if (irq > 15)
+ {
+ printk ("ad1848.c: Bogus interrupt %d\n", irq);
+ return;
+ }
+
+ dev = irq2dev[irq];
+ devc = (ad1848_info *) audio_devs[dev]->devc;
+ }
+ else
+ devc = (ad1848_info *) audio_devs[dev]->devc;
+
+ status = inb (io_Status (devc));
if (status == 0x80)
printk ("ad1848_interrupt: Why?\n");
if (status & 0x01)
{
- if (devc->opened && devc->irq_mode == IMODE_OUTPUT)
+ int alt_stat;
+
+ if (devc->mode != MD_1848)
{
- DMAbuf_outputintr (dev, 1);
+ alt_stat = ad_read (devc, 24);
+ if (alt_stat & 0x40) /* Timer interrupt */
+ {
+ devc->timer_ticks++;
+#ifndef EXCLUDE_SEQUENCER
+ if (timer_installed == dev && devc->timer_running)
+ sound_timer_interrupt ();
+#endif
+ }
}
+ else
+ alt_stat = 0xff;
- if (devc->opened && devc->irq_mode == IMODE_INPUT)
- DMAbuf_inputintr (dev);
+ if (devc->opened && devc->irq_mode & PCM_ENABLE_INPUT && alt_stat & 0x20)
+ {
+ DMAbuf_inputintr (dev);
+ }
+
+ if (devc->opened && devc->irq_mode & PCM_ENABLE_OUTPUT && alt_stat & 0x10)
+ {
+ DMAbuf_outputintr (dev, 1);
+ }
}
- OUTB (0, io_Status (devc)); /* Clear interrupt status */
+ outb (0, io_Status (devc)); /* Clear interrupt status */
- status = INB (io_Status (devc));
- if (status == 0x80 || status & 0x01)
- {
- printk ("ad1848: Problems when clearing interrupt, status=%x\n", status);
- OUTB (0, io_Status (devc)); /* Try again */
- }
}
/*
@@ -1383,6 +1618,14 @@
int
probe_ms_sound (struct address_info *hw_config)
{
+ unsigned char tmp;
+
+ if (check_region (hw_config->io_base, 8))
+ {
+ printk ("MSS: I/O port conflict\n");
+ return 0;
+ }
+
#if !defined(EXCLUDE_AEDSP16) && defined(AEDSP16_MSS)
/*
* Initialize Audio Excel DSP 16 to MSS: before any operation
@@ -1395,14 +1638,17 @@
/*
* Check if the IO port returns valid signature. The original MS Sound
* system returns 0x04 while some cards (AudioTriX Pro for example)
- * return 0x00.
+ * return 0x00 or 0x0f.
*/
- if ((INB (hw_config->io_base + 3) & 0x3f) != 0x04 &&
- (INB (hw_config->io_base + 3) & 0x3f) != 0x00)
+ if ((tmp = inb (hw_config->io_base + 3)) == 0xff) /* Bus float */
+ return 0;
+ if ((tmp & 0x3f) != 0x04 &&
+ (tmp & 0x3f) != 0x0f &&
+ (tmp & 0x3f) != 0x00)
{
DDB (printk ("No MSS signature detected on port 0x%x (0x%x)\n",
- hw_config->io_base, INB (hw_config->io_base + 3)));
+ hw_config->io_base, inb (hw_config->io_base + 3)));
return 0;
}
@@ -1422,19 +1668,19 @@
* Check that DMA0 is not in use with a 8 bit board.
*/
- if (hw_config->dma == 0 && INB (hw_config->io_base + 3) & 0x80)
+ if (hw_config->dma == 0 && inb (hw_config->io_base + 3) & 0x80)
{
printk ("MSS: Can't use DMA0 with a 8 bit card/slot\n");
return 0;
}
- if (hw_config->irq > 7 && hw_config->irq != 9 && INB (hw_config->io_base + 3) & 0x80)
+ if (hw_config->irq > 7 && hw_config->irq != 9 && inb (hw_config->io_base + 3) & 0x80)
{
printk ("MSS: Can't use IRQ%d with a 8 bit card/slot\n", hw_config->irq);
return 0;
}
- return ad1848_detect (hw_config->io_base + 4);
+ return ad1848_detect (hw_config->io_base + 4, NULL, hw_config->osp);
}
long
@@ -1453,7 +1699,7 @@
int config_port = hw_config->io_base + 0, version_port = hw_config->io_base + 3;
- if (!ad1848_detect (hw_config->io_base + 4))
+ if (!ad1848_detect (hw_config->io_base + 4, NULL, hw_config->osp))
return mem_start;
/*
@@ -1464,17 +1710,174 @@
if (bits == -1)
return mem_start;
- OUTB (bits | 0x40, config_port);
- if ((INB (version_port) & 0x40) == 0)
+ outb (bits | 0x40, config_port);
+ if ((inb (version_port) & 0x40) == 0)
printk ("[IRQ Conflict?]");
- OUTB (bits | dma_bits[hw_config->dma], config_port); /* Write IRQ+DMA setup */
+ outb (bits | dma_bits[hw_config->dma], config_port); /* Write IRQ+DMA setup */
ad1848_init ("MS Sound System", hw_config->io_base + 4,
hw_config->irq,
hw_config->dma,
- hw_config->dma);
+ hw_config->dma, 0, hw_config->osp);
+ request_region (hw_config->io_base, 4, "WSS config");
return mem_start;
}
+void
+unload_ms_sound (struct address_info *hw_config)
+{
+ ad1848_unload (hw_config->io_base + 4,
+ hw_config->irq,
+ hw_config->dma,
+ hw_config->dma, 0);
+ release_region (hw_config->io_base, 4);
+}
+
+/*
+ * WSS compatible PnP codec support
+ */
+
+int
+probe_pnp_ad1848 (struct address_info *hw_config)
+{
+ return ad1848_detect (hw_config->io_base, NULL, hw_config->osp);
+}
+
+long
+attach_pnp_ad1848 (long mem_start, struct address_info *hw_config)
+{
+
+ ad1848_init (hw_config->name, hw_config->io_base,
+ hw_config->irq,
+ hw_config->dma,
+ hw_config->dma2, 0, hw_config->osp);
+ return mem_start;
+}
+
+void
+unload_pnp_ad1848 (struct address_info *hw_config)
+{
+ ad1848_unload (hw_config->io_base,
+ hw_config->irq,
+ hw_config->dma,
+ hw_config->dma2, 0);
+ release_region (hw_config->io_base, 4);
+}
+
+#ifndef EXCLUDE_SEQUENCER
+/*
+ * Timer stuff (for /dev/music).
+ */
+
+static unsigned int current_interval = 0;
+
+static unsigned int
+ad1848_tmr_start (int dev, unsigned int usecs)
+{
+ unsigned long flags;
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+ unsigned long xtal_nsecs; /* nanoseconds per xtal oscillaror tick */
+ unsigned long divider;
+
+ save_flags (flags);
+ cli ();
+
+/*
+ * Length of the timer interval (in nanoseconds) depends on the
+ * selected crystal oscillator. Check this from bit 0x01 of I8.
+ *
+ * AD1845 has just one oscillator which has cycle time of 10.050 us
+ * (when a 24.576 MHz xtal oscillator is used).
+ *
+ * Convert requested interval to nanoseconds before computing
+ * the timer divider.
+ */
+
+ if (devc->mode == MD_1845)
+ xtal_nsecs = 10050;
+ else if (ad_read (devc, 8) & 0x01)
+ xtal_nsecs = 9920;
+ else
+ xtal_nsecs = 9969;
+
+ divider = (usecs * 1000 + xtal_nsecs / 2) / xtal_nsecs;
+
+ if (divider < 100) /* Don't allow shorter intervals than about 1ms */
+ divider = 100;
+
+ if (divider > 65535) /* Overflow check */
+ divider = 65535;
+
+ ad_write (devc, 21, (divider >> 8) & 0xff); /* Set upper bits */
+ ad_write (devc, 20, divider & 0xff); /* Set lower bits */
+ ad_write (devc, 16, ad_read (devc, 16) | 0x40); /* Start the timer */
+ devc->timer_running = 1;
+ restore_flags (flags);
+
+ return current_interval = (divider * xtal_nsecs + 500) / 1000;
+}
+
+static void
+ad1848_tmr_reprogram (int dev)
+{
+/*
+ * Audio driver has changed sampling rate so that a different xtal
+ * oscillator was selected. We have to reprogram the timer rate.
+ */
+
+ ad1848_tmr_start (dev, current_interval);
+ sound_timer_syncinterval (current_interval);
+}
+
+static void
+ad1848_tmr_disable (int dev)
+{
+ unsigned long flags;
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+
+ save_flags (flags);
+ cli ();
+ ad_write (devc, 16, ad_read (devc, 16) & ~0x40);
+ devc->timer_running = 0;
+ restore_flags (flags);
+}
+
+static void
+ad1848_tmr_restart (int dev)
+{
+ unsigned long flags;
+ ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
+
+ if (current_interval == 0)
+ return;
+
+ save_flags (flags);
+ cli ();
+ ad_write (devc, 16, ad_read (devc, 16) | 0x40);
+ devc->timer_running = 1;
+ restore_flags (flags);
+}
+
+static struct sound_lowlev_timer ad1848_tmr =
+{
+ 0,
+ ad1848_tmr_start,
+ ad1848_tmr_disable,
+ ad1848_tmr_restart
+};
+
+static int
+ad1848_tmr_install (int dev)
+{
+
+ if (timer_installed != -1)
+ return 0; /* Don't install another timer */
+
+ timer_installed = ad1848_tmr.dev = dev;
+ sound_timer_init (&ad1848_tmr, audio_devs[dev]->name);
+
+ return 1;
+}
+#endif
#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov
with Sam's (original) version of this