[alsa-devel] [PATCH] ALSA sound driver for SEGA Dreamcast AICA (pcm)
Heikki Orsila
shdl at zakalwe.fi
Tue May 15 02:47:51 CEST 2007
I still noticed some type cleanups, and possibly a good debug message..
On Mon, May 14, 2007 at 11:14:55PM +0100, Adrian McMenamin wrote:
> +/* spu_memload - write to SPU address space */
> +static void spu_memload(u32 toi, void __iomem * from, int length)
> +{
> + u32 __iomem *froml = from;
> + u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
> + int i, val;
You should use "void *from" because it's not IO memory. Also, use "u32 val"
since that is the native type of "u32 *from".
> + length = DIV_ROUND_UP(length, 4);
> + spu_write_wait();
> + for (i = 0; i < length; i++) {
> + val = *froml;
> + writel(val, to);
> + froml++;
> + to++;
> + if (i && !(i % 8))
> + spu_write_wait();
> + }
> +}
It seems a small simplification is possible:
/* remove first spu_write_wait(); */
for (i = 0; i < length; i++) {
if (!(i % 8))
spu_write_wait();
val = *froml;
...
}
> +/* SPU specific functions */
> +/* spu_write_wait - wait for G2-SH FIFO to clear */
> +static void spu_write_wait(void)
> +{
> + int time_count;
> + time_count = 0;
> + while (1) {
> + if (!(readl(G2_FIFO) & 0x11))
> + break;
> + /* To ensure hardware failure doesn't wedge kernel */
> + time_count++;
> + if (time_count > 0x10000)
Maybe this deserves a printk() message?
> +static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
> + .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
> + .formats =
> + (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
> + SNDRV_PCM_FMTBIT_IMA_ADPCM),
> + .rates = SNDRV_PCM_RATE_8000_48000,
> + .rate_min = 8000,
> + .rate_max = 48000,
> + .channels_min = 1,
> + .channels_max = 2,
> + .buffer_bytes_max = AICA_BUFFER_SIZE,
> + .period_bytes_min = AICA_PERIOD_SIZE,
> + .period_bytes_max = AICA_PERIOD_SIZE,
> + .periods_min = AICA_PERIOD_NUMBER,
> + .periods_max = AICA_PERIOD_NUMBER,
> +};
> +
> +static int aica_dma_transfer(int channels, int buffer_size,
> + struct snd_pcm_substream *substream)
> +{
> + int q, err, period_offset;
> + struct snd_card_aica *dreamcastcard;
> + struct snd_pcm_runtime *runtime;
> + err = 0;
> + dreamcastcard = substream->pcm->private_data;
> + period_offset = dreamcastcard->clicks;
> + period_offset %= (AICA_PERIOD_NUMBER / channels);
> + runtime = substream->runtime;
> + for (q = 0; q < channels; q++) {
> + err = dma_xfer(AICA_DMA_CHANNEL,
> + (unsigned long)(runtime->dma_area +
> + (AICA_BUFFER_SIZE * q) /
> + channels +
> + AICA_PERIOD_SIZE *
> + period_offset),
> + AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
> + AICA_PERIOD_SIZE * period_offset,
> + buffer_size / channels, AICA_DMA_MODE);
> + if (unlikely(err < 0))
> + break;
> + dma_wait_for_completion(AICA_DMA_CHANNEL);
> + }
> + return err;
> +}
> +
> +static void startup_aica(struct snd_card_aica *dreamcastcard)
> +{
> + spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
> + (u8 *) dreamcastcard->channel,
Why cast to u8 *? spu_memload gets a void *, and the void * is casted
into an u32 *.
> + sizeof(struct aica_channel));
> + aica_chn_start();
> +}
> +
> +static void run_spu_dma(struct work_struct *work)
> +{
> + int buffer_size;
> + struct snd_pcm_substream *substream;
> + struct snd_pcm_runtime *runtime;
> + struct snd_card_aica *dreamcastcard;
> + struct spu_work_holder *holder = container_of(work, struct spu_work_holder, spu_dma_work);
> + substream = holder-> sspointer;
> + dreamcastcard = substream->pcm->private_data;
> + runtime = substream->runtime;
> + if (unlikely(dreamcastcard->dma_check == 0)) {
> + buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
> + if (runtime->channels > 1)
> + dreamcastcard->channel->flags |= 0x01;
> + aica_dma_transfer(runtime->channels, buffer_size, substream);
> + startup_aica(dreamcastcard);
> + dreamcastcard->clicks =
> + buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
> + return;
> + } else {
> + aica_dma_transfer(runtime->channels,
> + AICA_PERIOD_SIZE * runtime->channels,
> + substream);
> + snd_pcm_period_elapsed(dreamcastcard->substream);
> + dreamcastcard->clicks++;
> + if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
> + {
> + dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
> + }
> + mod_timer(&dreamcastcard->timer, jiffies + 1);
> + }
> +}
> +
> +static void aica_period_elapsed(unsigned long timer_var)
> +{
> + /*timer function - so cannot sleep */
> + int play_period;
> + struct snd_pcm_runtime *runtime;
> + struct snd_pcm_substream *substream;
> + struct snd_card_aica *dreamcastcard;
> + substream = (struct snd_pcm_substream *)timer_var;
> + runtime = substream->runtime;
> + dreamcastcard = substream->pcm->private_data;
> + /* Have we played out an additional period? */
> + play_period =
> + frames_to_bytes(runtime,
> + readl
> + (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
> + AICA_PERIOD_SIZE;
> + if (play_period == dreamcastcard->current_period) {
> + /* reschedule the timer */
> + mod_timer(&(dreamcastcard->timer), jiffies + 1);
> + return;
> + }
> + if (runtime->channels > 1)
> + dreamcastcard->current_period = play_period;
> + if (unlikely(dreamcastcard->dma_check == 0))
> + dreamcastcard->dma_check = 1;
> + queue_work(aica_queue, &(spu_working.spu_dma_work));
> +}
> +
> +static void spu_begin_dma(struct snd_pcm_substream *substream)
> +{
> + /* Must be atomic */
> + struct snd_card_aica *dreamcastcard;
> + struct snd_pcm_runtime *runtime;
> + runtime = substream->runtime;
> + dreamcastcard = substream->pcm->private_data;
> + /* Use queue to do the heavy lifting */
> + spu_working.sspointer = substream;
> + INIT_WORK(&(spu_working.spu_dma_work), run_spu_dma);
> + queue_work(aica_queue, &(spu_working.spu_dma_work));
> + /* Timer may already be running */
> + if (unlikely(dreamcastcard->timer.data)) {
> + mod_timer(&dreamcastcard->timer, jiffies + 4);
> + return;
> + }
> + init_timer(&(dreamcastcard->timer));
> + dreamcastcard->timer.data = (unsigned long)substream;
> + dreamcastcard->timer.function = aica_period_elapsed;
> + dreamcastcard->timer.expires = jiffies + 4;
> + add_timer(&(dreamcastcard->timer));
> +}
> +
> +static int snd_aicapcm_pcm_open(struct snd_pcm_substream
> + *substream)
> +{
> + struct snd_pcm_runtime *runtime;
> + struct aica_channel *channel;
> + struct snd_card_aica *dreamcastcard;
> + if (!enable)
> + return -ENOENT;
> + dreamcastcard = substream->pcm->private_data;
> + channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
> + if (!channel)
> + return -ENOMEM;
> + /* set defaults for channel */
> + channel->sfmt = SM_8BIT;
> + channel->cmd = AICA_CMD_START;
> + channel->vol = dreamcastcard->master_volume;
> + channel->pan = 0x80;
> + channel->pos = 0;
> + channel->flags = 0; /* default to mono */
> + dreamcastcard->channel = channel;
> + runtime = substream->runtime;
> + runtime->hw = snd_pcm_aica_playback_hw;
> + spu_enable();
> + dreamcastcard->clicks = 0;
> + dreamcastcard->current_period = 0;
> + dreamcastcard->dma_check = 0;
> + return 0;
> +}
> +
> +static int snd_aicapcm_pcm_close(struct snd_pcm_substream
> + *substream)
> +{
> + struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
> + del_timer(&dreamcastcard->timer);
> + kfree(dreamcastcard->channel);
> + spu_disable();
> + return 0;
> +}
> +
> +static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
> + *substream)
> +{
> + /* Free the DMA buffer */
> + return snd_pcm_lib_free_pages(substream);
> +}
> +
> +static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
> + *substream, struct snd_pcm_hw_params
> + *hw_params)
> +{
> + /* Allocate a DMA buffer using ALSA built-ins */
> + return
> + snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
> +}
> +
> +static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
> + *substream)
> +{
> + struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
> + if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
> + dreamcastcard->channel->sfmt = SM_16BIT;
> + dreamcastcard->channel->freq = substream->runtime->rate;
> + dreamcastcard->substream = substream;
> + return 0;
> +}
> +
> +static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
> + *substream, int cmd)
> +{
> + struct snd_card_aica *dreamcastcard;
> + switch (cmd) {
> + case SNDRV_PCM_TRIGGER_START:
> + spu_begin_dma(substream);
> + break;
> + case SNDRV_PCM_TRIGGER_STOP:
> + dreamcastcard = substream->pcm->private_data;
> + if (dreamcastcard->timer.data)
> + del_timer(&dreamcastcard->timer);
> + aica_chn_halt();
> + break;
> + default:
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
> + *substream)
> +{
> + return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
> +}
> +
> +static struct snd_pcm_ops snd_aicapcm_playback_ops = {
> + .open = snd_aicapcm_pcm_open,
> + .close = snd_aicapcm_pcm_close,
> + .ioctl = snd_pcm_lib_ioctl,
> + .hw_params = snd_aicapcm_pcm_hw_params,
> + .hw_free = snd_aicapcm_pcm_hw_free,
> + .prepare = snd_aicapcm_pcm_prepare,
> + .trigger = snd_aicapcm_pcm_trigger,
> + .pointer = snd_aicapcm_pcm_pointer,
> +};
> +
> +/* TO DO: set up to handle more than one pcm instance */
> +static int __init snd_aicapcmchip(struct snd_card_aica
> + *dreamcastcard, int pcm_index)
> +{
> + struct snd_pcm *pcm;
> + int err;
> + /* AICA has no capture ability */
> + err =
> + snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, &pcm);
> + if (unlikely(err < 0))
> + return err;
> + pcm->private_data = dreamcastcard;
> + strcpy(pcm->name, "AICA PCM");
> + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
> + &snd_aicapcm_playback_ops);
> + /* Allocate the DMA buffers */
> + err =
> + snd_pcm_lib_preallocate_pages_for_all(pcm,
> + SNDRV_DMA_TYPE_CONTINUOUS,
> + snd_dma_continuous_data
> + (GFP_KERNEL),
> + AICA_BUFFER_SIZE,
> + AICA_BUFFER_SIZE);
> + return err;
> +}
> +
> +/* Mixer controls */
> +static int aica_pcmswitch_info(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_info *uinfo)
> +{
> + uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
> + uinfo->count = 1;
> + uinfo->value.integer.min = 0;
> + uinfo->value.integer.max = 1;
> + return 0;
> +}
> +
> +static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */
> + return 0;
> +}
> +
> +static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + if (ucontrol->value.integer.value[0] == 1)
> + return 0; /* TO DO: Fix me */
> + else
> + aica_chn_halt();
> + return 0;
> +}
> +
> +static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_info *uinfo)
> +{
> + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
> + uinfo->count = 1;
> + uinfo->value.integer.min = 0;
> + uinfo->value.integer.max = 0xFF;
> + return 0;
> +}
> +
> +static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_card_aica *dreamcastcard;
> + dreamcastcard = kcontrol->private_data;
> + if (unlikely(!dreamcastcard->channel))
> + return -ETXTBSY; /* we've not yet been set up */
> + ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
> + return 0;
> +}
> +
> +static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_card_aica *dreamcastcard;
> + dreamcastcard = kcontrol->private_data;
> + if (unlikely(!dreamcastcard->channel))
> + return -ETXTBSY;
> + if (unlikely(dreamcastcard->channel->vol ==
> + ucontrol->value.integer.value[0]))
> + return 0;
> + dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
> + dreamcastcard->master_volume = ucontrol->value.integer.value[0];
> + spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
> + (u8 *) dreamcastcard->channel,
Unuseful cast again.
--
Heikki Orsila Barbie's law:
heikki.orsila at iki.fi "Math is hard, let's go shopping!"
http://www.iki.fi/shd
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