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241 lines
6.6 KiB
241 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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// |
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// Freescale MPC5200 PSC in I2S mode |
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// ALSA SoC Digital Audio Interface (DAI) driver |
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// |
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// Copyright (C) 2008 Secret Lab Technologies Ltd. |
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// Copyright (C) 2009 Jon Smirl, Digispeaker |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/of_platform.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <asm/mpc52xx_psc.h> |
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#include "mpc5200_dma.h" |
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/** |
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* PSC_I2S_RATES: sample rates supported by the I2S |
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* |
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* This driver currently only supports the PSC running in I2S slave mode, |
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* which means the codec determines the sample rate. Therefore, we tell |
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* ALSA that we support all rates and let the codec driver decide what rates |
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* are really supported. |
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*/ |
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#define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS |
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/** |
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* PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode |
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*/ |
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#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ |
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SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) |
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static int psc_i2s_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *dai) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); |
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u32 mode; |
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dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" |
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" periods=%i buffer_size=%i buffer_bytes=%i\n", |
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__func__, substream, params_period_size(params), |
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params_period_bytes(params), params_periods(params), |
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params_buffer_size(params), params_buffer_bytes(params)); |
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switch (params_format(params)) { |
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case SNDRV_PCM_FORMAT_S8: |
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mode = MPC52xx_PSC_SICR_SIM_CODEC_8; |
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break; |
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case SNDRV_PCM_FORMAT_S16_BE: |
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mode = MPC52xx_PSC_SICR_SIM_CODEC_16; |
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break; |
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case SNDRV_PCM_FORMAT_S24_BE: |
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mode = MPC52xx_PSC_SICR_SIM_CODEC_24; |
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break; |
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case SNDRV_PCM_FORMAT_S32_BE: |
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mode = MPC52xx_PSC_SICR_SIM_CODEC_32; |
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break; |
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default: |
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dev_dbg(psc_dma->dev, "invalid format\n"); |
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return -EINVAL; |
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} |
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out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); |
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return 0; |
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} |
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/** |
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* psc_i2s_set_sysclk: set the clock frequency and direction |
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* |
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* This function is called by the machine driver to tell us what the clock |
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* frequency and direction are. |
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* |
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* Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), |
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* and we don't care about the frequency. Return an error if the direction |
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* is not SND_SOC_CLOCK_IN. |
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* |
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* @clk_id: reserved, should be zero |
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* @freq: the frequency of the given clock ID, currently ignored |
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* @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) |
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*/ |
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static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, |
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int clk_id, unsigned int freq, int dir) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
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dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", |
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cpu_dai, dir); |
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return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; |
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} |
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/** |
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* psc_i2s_set_fmt: set the serial format. |
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* |
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* This function is called by the machine driver to tell us what serial |
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* format to use. |
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* |
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* This driver only supports I2S mode. Return an error if the format is |
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* not SND_SOC_DAIFMT_I2S. |
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* |
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* @format: one of SND_SOC_DAIFMT_xxx |
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*/ |
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static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) |
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{ |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
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dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", |
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cpu_dai, format); |
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return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; |
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} |
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/* --------------------------------------------------------------------- |
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* ALSA SoC Bindings |
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* |
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* - Digital Audio Interface (DAI) template |
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* - create/destroy dai hooks |
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*/ |
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/** |
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* psc_i2s_dai_template: template CPU Digital Audio Interface |
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*/ |
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static const struct snd_soc_dai_ops psc_i2s_dai_ops = { |
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.hw_params = psc_i2s_hw_params, |
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.set_sysclk = psc_i2s_set_sysclk, |
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.set_fmt = psc_i2s_set_fmt, |
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}; |
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static struct snd_soc_dai_driver psc_i2s_dai[] = {{ |
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.name = "mpc5200-psc-i2s.0", |
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.playback = { |
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.stream_name = "I2S Playback", |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = PSC_I2S_RATES, |
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.formats = PSC_I2S_FORMATS, |
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}, |
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.capture = { |
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.stream_name = "I2S Capture", |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = PSC_I2S_RATES, |
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.formats = PSC_I2S_FORMATS, |
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}, |
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.ops = &psc_i2s_dai_ops, |
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} }; |
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static const struct snd_soc_component_driver psc_i2s_component = { |
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.name = "mpc5200-i2s", |
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}; |
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/* --------------------------------------------------------------------- |
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* OF platform bus binding code: |
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* - Probe/remove operations |
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* - OF device match table |
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*/ |
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static int psc_i2s_of_probe(struct platform_device *op) |
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{ |
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int rc; |
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struct psc_dma *psc_dma; |
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struct mpc52xx_psc __iomem *regs; |
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rc = mpc5200_audio_dma_create(op); |
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if (rc != 0) |
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return rc; |
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rc = snd_soc_register_component(&op->dev, &psc_i2s_component, |
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psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); |
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if (rc != 0) { |
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pr_err("Failed to register DAI\n"); |
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return rc; |
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} |
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psc_dma = dev_get_drvdata(&op->dev); |
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regs = psc_dma->psc_regs; |
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/* Configure the serial interface mode; defaulting to CODEC8 mode */ |
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psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | |
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MPC52xx_PSC_SICR_CLKPOL; |
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out_be32(&psc_dma->psc_regs->sicr, |
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psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); |
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/* Check for the codec handle. If it is not present then we |
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* are done */ |
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if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) |
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return 0; |
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/* Due to errata in the dma mode; need to line up enabling |
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* the transmitter with a transition on the frame sync |
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* line */ |
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/* first make sure it is low */ |
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while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) |
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; |
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/* then wait for the transition to high */ |
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while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) |
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; |
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/* Finally, enable the PSC. |
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* Receiver must always be enabled; even when we only want |
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* transmit. (see 15.3.2.3 of MPC5200B User's Guide) */ |
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/* Go */ |
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out_8(&psc_dma->psc_regs->command, |
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MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); |
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return 0; |
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} |
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static int psc_i2s_of_remove(struct platform_device *op) |
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{ |
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mpc5200_audio_dma_destroy(op); |
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snd_soc_unregister_component(&op->dev); |
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return 0; |
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} |
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/* Match table for of_platform binding */ |
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static const struct of_device_id psc_i2s_match[] = { |
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{ .compatible = "fsl,mpc5200-psc-i2s", }, |
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{ .compatible = "fsl,mpc5200b-psc-i2s", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, psc_i2s_match); |
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static struct platform_driver psc_i2s_driver = { |
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.probe = psc_i2s_of_probe, |
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.remove = psc_i2s_of_remove, |
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.driver = { |
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.name = "mpc5200-psc-i2s", |
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.of_match_table = psc_i2s_match, |
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}, |
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}; |
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module_platform_driver(psc_i2s_driver); |
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MODULE_AUTHOR("Grant Likely <[email protected]>"); |
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MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); |
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MODULE_LICENSE("GPL"); |
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