242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
// 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 = substream->private_data;
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
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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 <grant.likely@secretlab.ca>");
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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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