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1// SPDX-License-Identifier: GPL-2.0-only2//3// Freescale MPC5200 PSC in I2S mode4// ALSA SoC Digital Audio Interface (DAI) driver5//6// Copyright (C) 2008 Secret Lab Technologies Ltd.7// Copyright (C) 2009 Jon Smirl, Digispeaker8 9#include <linux/module.h>10#include <linux/of.h>11 12#include <sound/pcm.h>13#include <sound/pcm_params.h>14#include <sound/soc.h>15 16#include <asm/mpc52xx_psc.h>17 18#include "mpc5200_dma.h"19 20/**21 * PSC_I2S_RATES: sample rates supported by the I2S22 *23 * This driver currently only supports the PSC running in I2S slave mode,24 * which means the codec determines the sample rate. Therefore, we tell25 * ALSA that we support all rates and let the codec driver decide what rates26 * are really supported.27 */28#define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS29 30/**31 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode32 */33#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \34 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)35 36static int psc_i2s_hw_params(struct snd_pcm_substream *substream,37 struct snd_pcm_hw_params *params,38 struct snd_soc_dai *dai)39{40 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);41 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));42 u32 mode;43 44 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"45 " periods=%i buffer_size=%i buffer_bytes=%i\n",46 __func__, substream, params_period_size(params),47 params_period_bytes(params), params_periods(params),48 params_buffer_size(params), params_buffer_bytes(params));49 50 switch (params_format(params)) {51 case SNDRV_PCM_FORMAT_S8:52 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;53 break;54 case SNDRV_PCM_FORMAT_S16_BE:55 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;56 break;57 case SNDRV_PCM_FORMAT_S24_BE:58 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;59 break;60 case SNDRV_PCM_FORMAT_S32_BE:61 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;62 break;63 default:64 dev_dbg(psc_dma->dev, "invalid format\n");65 return -EINVAL;66 }67 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);68 69 return 0;70}71 72/**73 * psc_i2s_set_sysclk: set the clock frequency and direction74 *75 * This function is called by the machine driver to tell us what the clock76 * frequency and direction are.77 *78 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),79 * and we don't care about the frequency. Return an error if the direction80 * is not SND_SOC_CLOCK_IN.81 *82 * @clk_id: reserved, should be zero83 * @freq: the frequency of the given clock ID, currently ignored84 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)85 */86static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,87 int clk_id, unsigned int freq, int dir)88{89 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);90 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",91 cpu_dai, dir);92 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;93}94 95/**96 * psc_i2s_set_fmt: set the serial format.97 *98 * This function is called by the machine driver to tell us what serial99 * format to use.100 *101 * This driver only supports I2S mode. Return an error if the format is102 * not SND_SOC_DAIFMT_I2S.103 *104 * @format: one of SND_SOC_DAIFMT_xxx105 */106static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)107{108 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);109 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",110 cpu_dai, format);111 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;112}113 114/* ---------------------------------------------------------------------115 * ALSA SoC Bindings116 *117 * - Digital Audio Interface (DAI) template118 * - create/destroy dai hooks119 */120 121/**122 * psc_i2s_dai_template: template CPU Digital Audio Interface123 */124static const struct snd_soc_dai_ops psc_i2s_dai_ops = {125 .hw_params = psc_i2s_hw_params,126 .set_sysclk = psc_i2s_set_sysclk,127 .set_fmt = psc_i2s_set_fmt,128};129 130static struct snd_soc_dai_driver psc_i2s_dai[] = {{131 .name = "mpc5200-psc-i2s.0",132 .playback = {133 .stream_name = "I2S Playback",134 .channels_min = 2,135 .channels_max = 2,136 .rates = PSC_I2S_RATES,137 .formats = PSC_I2S_FORMATS,138 },139 .capture = {140 .stream_name = "I2S Capture",141 .channels_min = 2,142 .channels_max = 2,143 .rates = PSC_I2S_RATES,144 .formats = PSC_I2S_FORMATS,145 },146 .ops = &psc_i2s_dai_ops,147} };148 149static const struct snd_soc_component_driver psc_i2s_component = {150 .name = "mpc5200-i2s",151 .legacy_dai_naming = 1,152};153 154/* ---------------------------------------------------------------------155 * OF platform bus binding code:156 * - Probe/remove operations157 * - OF device match table158 */159static int psc_i2s_of_probe(struct platform_device *op)160{161 int rc;162 struct psc_dma *psc_dma;163 struct mpc52xx_psc __iomem *regs;164 165 rc = mpc5200_audio_dma_create(op);166 if (rc != 0)167 return rc;168 169 rc = snd_soc_register_component(&op->dev, &psc_i2s_component,170 psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));171 if (rc != 0) {172 pr_err("Failed to register DAI\n");173 return rc;174 }175 176 psc_dma = dev_get_drvdata(&op->dev);177 regs = psc_dma->psc_regs;178 179 /* Configure the serial interface mode; defaulting to CODEC8 mode */180 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |181 MPC52xx_PSC_SICR_CLKPOL;182 out_be32(&psc_dma->psc_regs->sicr,183 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);184 185 /* Check for the codec handle. If it is not present then we186 * are done */187 if (!of_property_present(op->dev.of_node, "codec-handle"))188 return 0;189 190 /* Due to errata in the dma mode; need to line up enabling191 * the transmitter with a transition on the frame sync192 * line */193 194 /* first make sure it is low */195 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)196 ;197 /* then wait for the transition to high */198 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0)199 ;200 /* Finally, enable the PSC.201 * Receiver must always be enabled; even when we only want202 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */203 204 /* Go */205 out_8(&psc_dma->psc_regs->command,206 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);207 208 return 0;209 210}211 212static void psc_i2s_of_remove(struct platform_device *op)213{214 mpc5200_audio_dma_destroy(op);215 snd_soc_unregister_component(&op->dev);216}217 218/* Match table for of_platform binding */219static const struct of_device_id psc_i2s_match[] = {220 { .compatible = "fsl,mpc5200-psc-i2s", },221 { .compatible = "fsl,mpc5200b-psc-i2s", },222 {}223};224MODULE_DEVICE_TABLE(of, psc_i2s_match);225 226static struct platform_driver psc_i2s_driver = {227 .probe = psc_i2s_of_probe,228 .remove = psc_i2s_of_remove,229 .driver = {230 .name = "mpc5200-psc-i2s",231 .of_match_table = psc_i2s_match,232 },233};234 235module_platform_driver(psc_i2s_driver);236 237MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");238MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");239MODULE_LICENSE("GPL");240 241