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_device.h> 11 #include <linux/of_platform.h> 12 13 #include <sound/pcm.h> 14 #include <sound/pcm_params.h> 15 #include <sound/soc.h> 16 17 #include <asm/mpc52xx_psc.h> 18 19 #include "mpc5200_dma.h" 20 21 /** 22 * PSC_I2S_RATES: sample rates supported by the I2S 23 * 24 * This driver currently only supports the PSC running in I2S slave mode, 25 * which means the codec determines the sample rate. Therefore, we tell 26 * ALSA that we support all rates and let the codec driver decide what rates 27 * are really supported. 28 */ 29 #define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS 30 31 /** 32 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode 33 */ 34 #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ 35 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) 36 37 static int psc_i2s_hw_params(struct snd_pcm_substream *substream, 38 struct snd_pcm_hw_params *params, 39 struct snd_soc_dai *dai) 40 { 41 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 42 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); 43 u32 mode; 44 45 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" 46 " periods=%i buffer_size=%i buffer_bytes=%i\n", 47 __func__, substream, params_period_size(params), 48 params_period_bytes(params), params_periods(params), 49 params_buffer_size(params), params_buffer_bytes(params)); 50 51 switch (params_format(params)) { 52 case SNDRV_PCM_FORMAT_S8: 53 mode = MPC52xx_PSC_SICR_SIM_CODEC_8; 54 break; 55 case SNDRV_PCM_FORMAT_S16_BE: 56 mode = MPC52xx_PSC_SICR_SIM_CODEC_16; 57 break; 58 case SNDRV_PCM_FORMAT_S24_BE: 59 mode = MPC52xx_PSC_SICR_SIM_CODEC_24; 60 break; 61 case SNDRV_PCM_FORMAT_S32_BE: 62 mode = MPC52xx_PSC_SICR_SIM_CODEC_32; 63 break; 64 default: 65 dev_dbg(psc_dma->dev, "invalid format\n"); 66 return -EINVAL; 67 } 68 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); 69 70 return 0; 71 } 72 73 /** 74 * psc_i2s_set_sysclk: set the clock frequency and direction 75 * 76 * This function is called by the machine driver to tell us what the clock 77 * frequency and direction are. 78 * 79 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), 80 * and we don't care about the frequency. Return an error if the direction 81 * is not SND_SOC_CLOCK_IN. 82 * 83 * @clk_id: reserved, should be zero 84 * @freq: the frequency of the given clock ID, currently ignored 85 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) 86 */ 87 static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, 88 int clk_id, unsigned int freq, int dir) 89 { 90 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 91 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", 92 cpu_dai, dir); 93 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; 94 } 95 96 /** 97 * psc_i2s_set_fmt: set the serial format. 98 * 99 * This function is called by the machine driver to tell us what serial 100 * format to use. 101 * 102 * This driver only supports I2S mode. Return an error if the format is 103 * not SND_SOC_DAIFMT_I2S. 104 * 105 * @format: one of SND_SOC_DAIFMT_xxx 106 */ 107 static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) 108 { 109 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 110 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", 111 cpu_dai, format); 112 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; 113 } 114 115 /* --------------------------------------------------------------------- 116 * ALSA SoC Bindings 117 * 118 * - Digital Audio Interface (DAI) template 119 * - create/destroy dai hooks 120 */ 121 122 /** 123 * psc_i2s_dai_template: template CPU Digital Audio Interface 124 */ 125 static const struct snd_soc_dai_ops psc_i2s_dai_ops = { 126 .hw_params = psc_i2s_hw_params, 127 .set_sysclk = psc_i2s_set_sysclk, 128 .set_fmt = psc_i2s_set_fmt, 129 }; 130 131 static struct snd_soc_dai_driver psc_i2s_dai[] = {{ 132 .name = "mpc5200-psc-i2s.0", 133 .playback = { 134 .stream_name = "I2S Playback", 135 .channels_min = 2, 136 .channels_max = 2, 137 .rates = PSC_I2S_RATES, 138 .formats = PSC_I2S_FORMATS, 139 }, 140 .capture = { 141 .stream_name = "I2S Capture", 142 .channels_min = 2, 143 .channels_max = 2, 144 .rates = PSC_I2S_RATES, 145 .formats = PSC_I2S_FORMATS, 146 }, 147 .ops = &psc_i2s_dai_ops, 148 } }; 149 150 static const struct snd_soc_component_driver psc_i2s_component = { 151 .name = "mpc5200-i2s", 152 .legacy_dai_naming = 1, 153 }; 154 155 /* --------------------------------------------------------------------- 156 * OF platform bus binding code: 157 * - Probe/remove operations 158 * - OF device match table 159 */ 160 static int psc_i2s_of_probe(struct platform_device *op) 161 { 162 int rc; 163 struct psc_dma *psc_dma; 164 struct mpc52xx_psc __iomem *regs; 165 166 rc = mpc5200_audio_dma_create(op); 167 if (rc != 0) 168 return rc; 169 170 rc = snd_soc_register_component(&op->dev, &psc_i2s_component, 171 psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); 172 if (rc != 0) { 173 pr_err("Failed to register DAI\n"); 174 return rc; 175 } 176 177 psc_dma = dev_get_drvdata(&op->dev); 178 regs = psc_dma->psc_regs; 179 180 /* Configure the serial interface mode; defaulting to CODEC8 mode */ 181 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | 182 MPC52xx_PSC_SICR_CLKPOL; 183 out_be32(&psc_dma->psc_regs->sicr, 184 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); 185 186 /* Check for the codec handle. If it is not present then we 187 * are done */ 188 if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) 189 return 0; 190 191 /* Due to errata in the dma mode; need to line up enabling 192 * the transmitter with a transition on the frame sync 193 * line */ 194 195 /* first make sure it is low */ 196 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) 197 ; 198 /* then wait for the transition to high */ 199 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) 200 ; 201 /* Finally, enable the PSC. 202 * Receiver must always be enabled; even when we only want 203 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */ 204 205 /* Go */ 206 out_8(&psc_dma->psc_regs->command, 207 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); 208 209 return 0; 210 211 } 212 213 static void psc_i2s_of_remove(struct platform_device *op) 214 { 215 mpc5200_audio_dma_destroy(op); 216 snd_soc_unregister_component(&op->dev); 217 } 218 219 /* Match table for of_platform binding */ 220 static const struct of_device_id psc_i2s_match[] = { 221 { .compatible = "fsl,mpc5200-psc-i2s", }, 222 { .compatible = "fsl,mpc5200b-psc-i2s", }, 223 {} 224 }; 225 MODULE_DEVICE_TABLE(of, psc_i2s_match); 226 227 static struct platform_driver psc_i2s_driver = { 228 .probe = psc_i2s_of_probe, 229 .remove_new = psc_i2s_of_remove, 230 .driver = { 231 .name = "mpc5200-psc-i2s", 232 .of_match_table = psc_i2s_match, 233 }, 234 }; 235 236 module_platform_driver(psc_i2s_driver); 237 238 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 239 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); 240 MODULE_LICENSE("GPL"); 241 242