1 // SPDX-License-Identifier: GPL-2.0-only 2 // 3 // Freescale MPC5200 PSC in I2S mode 4 // ALSA SoC Digital Audio Interface (DAI) driver 5 // 6 // Copyright (C) 2008 Secret Lab Technologies Ltd. 7 // Copyright (C) 2009 Jon Smirl, Digispeaker 8 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 I2S 22 * 23 * This driver currently only supports the PSC running in I2S slave mode, 24 * which means the codec determines the sample rate. Therefore, we tell 25 * ALSA that we support all rates and let the codec driver decide what rates 26 * are really supported. 27 */ 28 #define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS 29 30 /** 31 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode 32 */ 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 36 static 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 direction 74 * 75 * This function is called by the machine driver to tell us what the clock 76 * 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 direction 80 * is not SND_SOC_CLOCK_IN. 81 * 82 * @clk_id: reserved, should be zero 83 * @freq: the frequency of the given clock ID, currently ignored 84 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) 85 */ 86 static 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 serial 99 * format to use. 100 * 101 * This driver only supports I2S mode. Return an error if the format is 102 * not SND_SOC_DAIFMT_I2S. 103 * 104 * @format: one of SND_SOC_DAIFMT_xxx 105 */ 106 static 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 Bindings 116 * 117 * - Digital Audio Interface (DAI) template 118 * - create/destroy dai hooks 119 */ 120 121 /** 122 * psc_i2s_dai_template: template CPU Digital Audio Interface 123 */ 124 static 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 }; 129 130 static 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 } }; 148 149 static 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 operations 157 * - OF device match table 158 */ 159 static 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 we 186 * 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 enabling 191 * the transmitter with a transition on the frame sync 192 * 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 want 202 * 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 } 211 212 static 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 */ 219 static const struct of_device_id psc_i2s_match[] = { 220 { .compatible = "fsl,mpc5200-psc-i2s", }, 221 { .compatible = "fsl,mpc5200b-psc-i2s", }, 222 {} 223 }; 224 MODULE_DEVICE_TABLE(of, psc_i2s_match); 225 226 static 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 }; 234 235 module_platform_driver(psc_i2s_driver); 236 237 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 238 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); 239 MODULE_LICENSE("GPL"); 240 241