int dma_prog_channel (unsigned int chn, dma_setup_t *dma_setup)
{
if ((chn >= DMA_MAX_CHANNELS) || !dma_channels[chn].name ||
dma_valid_config(dma_setup) )
return -EINVAL;
DMACH_SRC_ADDR(chn) = dma_setup->src_address;
DMACH_DST_ADDR(chn) = dma_setup->dest_address;
DMACH_LEN(chn) = dma_setup->trans_length;
DMACH_CFG(chn) = dma_setup->cfg;
return 0;
}
int dma_prog_sg_channel(int chn, u32 dma_sg_list)
{
u32 dma_config;
if (chn >= DMA_MAX_CHANNELS)
return -EINVAL;
dma_config = DMA_CFG_CMP_CH_EN | DMA_CFG_CMP_CH_NR(chn - 1);
lpc313x_dma_lock();
DMACH_SRC_ADDR(chn) = dma_sg_list;
DMACH_DST_ADDR(chn) = DMACH_ALT_PHYS(chn - 1);
DMACH_LEN(chn) = 0x4;
DMACH_CFG(chn) = dma_config;
lpc313x_dma_unlock();
return 0;
}
static void lpc313x_check_dmall(unsigned long data) {
struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
struct snd_pcm_runtime *rtd = substream->runtime;
struct lpc313x_dma_data *prtd = rtd->private_data;
/* Determine buffer position from current DMA position. We don't need
the exact address, just the last finished period */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
mod_timer(&prtd->timer[0], jiffies + MINTICKINC);
prtd->dma_cur = (dma_addr_t) DMACH_SRC_ADDR(prtd->dmach - 1);
}
else {
mod_timer(&prtd->timer[1], jiffies + MINTICKINC);
prtd->dma_cur = (dma_addr_t) DMACH_DST_ADDR(prtd->dmach - 1);
}
/* Tell audio system more buffer space is available */
snd_pcm_period_elapsed(substream);
}
int dma_current_state (unsigned int chn,
unsigned int * psrc,
unsigned int * pdst,
unsigned int * plen,
unsigned int * pcfg,
unsigned int * pena,
unsigned int * pcnt)
{
if (chn >= DMA_MAX_CHANNELS || !dma_channels[chn].name) {
return -EINVAL;
}
*psrc = DMACH_SRC_ADDR(chn);
*pdst = DMACH_DST_ADDR(chn);
*plen = DMACH_LEN(chn);
*pcfg = DMACH_CFG(chn);
*pena = DMACH_EN(chn);
*pcnt = DMACH_TCNT(chn);
return 0;
}