/*
* prepare playback/capture stream
*/
static int snd_pmac_pcm_prepare(struct snd_pmac *chip, struct pmac_stream *rec, struct snd_pcm_substream *subs)
{
int i;
volatile struct dbdma_cmd __iomem *cp;
struct snd_pcm_runtime *runtime = subs->runtime;
int rate_index;
long offset;
struct pmac_stream *astr;
rec->dma_size = snd_pcm_lib_buffer_bytes(subs);
rec->period_size = snd_pcm_lib_period_bytes(subs);
rec->nperiods = rec->dma_size / rec->period_size;
rec->cur_period = 0;
rate_index = snd_pmac_rate_index(chip, rec, runtime->rate);
/* set up constraints */
astr = snd_pmac_get_stream(chip, another_stream(rec->stream));
if (! astr)
return -EINVAL;
astr->cur_freqs = 1 << rate_index;
astr->cur_formats = 1 << runtime->format;
chip->rate_index = rate_index;
chip->format = runtime->format;
/* We really want to execute a DMA stop command, after the AWACS
* is initialized.
* For reasons I don't understand, it stops the hissing noise
* common to many PowerBook G3 systems and random noise otherwise
* captured on iBook2's about every third time. -ReneR
*/
spin_lock_irq(&chip->reg_lock);
snd_pmac_dma_stop(rec);
chip->extra_dma.cmds->command = cpu_to_le16(DBDMA_STOP);
snd_pmac_dma_set_command(rec, &chip->extra_dma);
snd_pmac_dma_run(rec, RUN);
spin_unlock_irq(&chip->reg_lock);
mdelay(5);
spin_lock_irq(&chip->reg_lock);
/* continuous DMA memory type doesn't provide the physical address,
* so we need to resolve the address here...
*/
offset = runtime->dma_addr;
for (i = 0, cp = rec->cmd.cmds; i < rec->nperiods; i++, cp++) {
cp->phy_addr = cpu_to_le32(offset);
cp->req_count = cpu_to_le16(rec->period_size);
/*cp->res_count = cpu_to_le16(0);*/
cp->xfer_status = cpu_to_le16(0);
offset += rec->period_size;
}
/* make loop */
cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
cp->cmd_dep = cpu_to_le32(rec->cmd.addr);
snd_pmac_dma_stop(rec);
snd_pmac_dma_set_command(rec, &rec->cmd);
spin_unlock_irq(&chip->reg_lock);
return 0;
}
static int snd_pmac_beep_event(struct input_dev *dev, unsigned int type,
unsigned int code, int hz)
{
struct snd_pmac *chip;
struct pmac_beep *beep;
unsigned long flags;
int beep_speed = 0;
int srate;
int period, ncycles, nsamples;
int i, j, f;
short *p;
if (type != EV_SND)
return -1;
switch (code) {
case SND_BELL: if (hz) hz = 1000;
case SND_TONE: break;
default: return -1;
}
chip = input_get_drvdata(dev);
if (! chip || (beep = chip->beep) == NULL)
return -1;
if (! hz) {
spin_lock_irqsave(&chip->reg_lock, flags);
if (beep->running)
snd_pmac_beep_stop(chip);
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
beep_speed = snd_pmac_rate_index(chip, &chip->playback, BEEP_SRATE);
srate = chip->freq_table[beep_speed];
if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
hz = 1000;
spin_lock_irqsave(&chip->reg_lock, flags);
if (chip->playback.running || chip->capture.running || beep->running) {
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
beep->running = 1;
spin_unlock_irqrestore(&chip->reg_lock, flags);
if (hz == beep->hz && beep->volume == beep->volume_play) {
nsamples = beep->nsamples;
} else {
period = srate * 256 / hz; /* fixed point */
ncycles = BEEP_BUFLEN * 256 / period;
nsamples = (period * ncycles) >> 8;
f = ncycles * 65536 / nsamples;
j = 0;
p = beep->buf;
for (i = 0; i < nsamples; ++i, p += 2) {
p[0] = p[1] = beep_wform[j >> 8] * beep->volume;
j = (j + f) & 0xffff;
}
beep->hz = hz;
beep->volume_play = beep->volume;
beep->nsamples = nsamples;
}
spin_lock_irqsave(&chip->reg_lock, flags);
snd_pmac_beep_dma_start(chip, beep->nsamples * 4, beep->addr, beep_speed);
spin_unlock_irqrestore(&chip->reg_lock, flags);
return 0;
}
