static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; struct snd_dmaengine_dai_dma_data *dma_data; int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: wlen = 16; break; case SNDRV_PCM_FORMAT_S32_LE: wlen = 32; break; default: return -EINVAL; } if (mcbsp->pdata->buffer_size) { if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; period_words = params_period_bytes(params) / (wlen / 8); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) max_thrsh = mcbsp->max_tx_thres; else max_thrsh = mcbsp->max_rx_thres; /* * Use sDMA packet mode if McBSP is in threshold mode: * If period words less than the FIFO size the packet * size is set to the number of period words, otherwise * Look for the biggest threshold value which divides * the period size evenly. */ divider = period_words / max_thrsh; if (period_words % max_thrsh) divider++; while (period_words % divider && divider < period_words) divider++; if (divider == period_words) return -EINVAL; pkt_size = period_words / divider; } else if (channels > 1) { /* Use packet mode for non mono streams */ pkt_size = channels; } omap_mcbsp_set_threshold(substream, pkt_size); } dma_data->maxburst = pkt_size; if (mcbsp->configured) { /* McBSP already c
static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs; struct snd_dmaengine_dai_dma_data *dma_data; int wlen, channels, wpf; int pkt_size = 0; unsigned int format, div, framesize, master; dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); channels = params_channels(params); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: wlen = 16; break; case SNDRV_PCM_FORMAT_S32_LE: wlen = 32; break; default: return -EINVAL; } if (mcbsp->pdata->buffer_size) { if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) { int period_words, max_thrsh; int divider = 0; period_words = params_period_bytes(params) / (wlen / 8); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) max_thrsh = mcbsp->max_tx_thres; else max_thrsh = mcbsp->max_rx_thres; /* * Use sDMA packet mode if McBSP is in threshold mode: * If period words less than the FIFO size the packet * size is set to the number of period words, otherwise * Look for the biggest threshold value which divides * the period size evenly. */ divider = period_words / max_thrsh; if (period_words % max_thrsh) divider++; while (period_words % divider && divider < period_words) divider++; if (divider == period_words) return -EINVAL; pkt_size = period_words / divider; } else if (channels > 1) { /* Use packet mode for non mono streams */ pkt_size = channels; } omap_mcbsp_set_threshold(substream, pkt_size); } dma_data->maxburst = pkt_size; if (mcbsp->configured) { /* McBSP already configured by another stream */ return 0; } regs->rcr2 &= ~(RPHASE | RFRLEN2(0x7f) | RWDLEN2(7)); regs->xcr2 &= ~(RPHASE | XFRLEN2(0x7f) | XWDLEN2(7)); regs->rcr1 &= ~(RFRLEN1(0x7f) | RWDLEN1(7)); regs->xcr1 &= ~(XFRLEN1(0x7f) | XWDLEN1(7)); format = mcbsp->fmt & SND_SOC_DAIFMT_FORMAT_MASK; wpf = channels; if (channels == 2 && (format == SND_SOC_DAIFMT_I2S || format == SND_SOC_DAIFMT_LEFT_J)) { /* Use dual-phase frames */ regs->rcr2 |= RPHASE; regs->xcr2 |= XPHASE; /* Set 1 word per (McBSP) frame for phase1 and phase2 */ wpf--; regs->rcr2 |= RFRLEN2(wpf - 1); regs->xcr2 |= XFRLEN2(wpf - 1); } regs->rcr1 |= RFRLEN1(wpf - 1); regs->xcr1 |= XFRLEN1(wpf - 1); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: /* Set word lengths */ regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_16); regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_16); regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_16); regs->xcr1 |= XWDLEN1(OMAP_MCBSP_WORD_16); break; case SNDRV_PCM_FORMAT_S32_LE: /* Set word lengths */ regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_32); regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_32); regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_32); regs->xcr1 |= XWDLEN1(OMAP_MCBSP_WORD_32); break; default: /* Unsupported PCM format */ return -EINVAL; } /* In McBSP master modes, FRAME (i.e. sample rate) is generated * by _counting_ BCLKs. Calculate frame size in BCLKs */ master = mcbsp->fmt & SND_SOC_DAIFMT_MASTER_MASK; if (master == SND_SOC_DAIFMT_CBS_CFS) { div = mcbsp->clk_div ? mcbsp->clk_div : 1; framesize = (mcbsp->in_freq / div) / params_rate(params); if (framesize < wlen * channels) { printk(KERN_ERR "%s: not enough bandwidth for desired rate and " "channels\n", __func__); return -EINVAL; } } else framesize = wlen * channels; /* Set FS period and length in terms of bit clock periods */ regs->srgr2 &= ~FPER(0xfff); regs->srgr1 &= ~FWID(0xff); switch (format) { case SND_SOC_DAIFMT_I2S: case SND_SOC_DAIFMT_LEFT_J: regs->srgr2 |= FPER(framesize - 1); regs->srgr1 |= FWID((framesize >> 1) - 1); break; case SND_SOC_DAIFMT_DSP_A: case SND_SOC_DAIFMT_DSP_B: regs->srgr2 |= FPER(framesize - 1); regs->srgr1 |= FWID(0); break; } omap_mcbsp_config(mcbsp, &mcbsp->cfg_regs); mcbsp->wlen = wlen; mcbsp->configured = 1; return 0; }