1 /* 2 * Freescale MPC5200 PSC in I2S mode 3 * ALSA SoC Digital Audio Interface (DAI) driver 4 * 5 * Copyright (C) 2008 Secret Lab Technologies Ltd. 6 * Copyright (C) 2009 Jon Smirl, Digispeaker 7 */ 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_psc_i2s.h" 20 #include "mpc5200_dma.h" 21 22 /** 23 * PSC_I2S_RATES: sample rates supported by the I2S 24 * 25 * This driver currently only supports the PSC running in I2S slave mode, 26 * which means the codec determines the sample rate. Therefore, we tell 27 * ALSA that we support all rates and let the codec driver decide what rates 28 * are really supported. 29 */ 30 #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \ 31 SNDRV_PCM_RATE_CONTINUOUS) 32 33 /** 34 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode 35 */ 36 #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ 37 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) 38 39 static int psc_i2s_hw_params(struct snd_pcm_substream *substream, 40 struct snd_pcm_hw_params *params, 41 struct snd_soc_dai *dai) 42 { 43 struct snd_soc_pcm_runtime *rtd = substream->private_data; 44 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; 45 u32 mode; 46 47 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" 48 " periods=%i buffer_size=%i buffer_bytes=%i\n", 49 __func__, substream, params_period_size(params), 50 params_period_bytes(params), params_periods(params), 51 params_buffer_size(params), params_buffer_bytes(params)); 52 53 switch (params_format(params)) { 54 case SNDRV_PCM_FORMAT_S8: 55 mode = MPC52xx_PSC_SICR_SIM_CODEC_8; 56 break; 57 case SNDRV_PCM_FORMAT_S16_BE: 58 mode = MPC52xx_PSC_SICR_SIM_CODEC_16; 59 break; 60 case SNDRV_PCM_FORMAT_S24_BE: 61 mode = MPC52xx_PSC_SICR_SIM_CODEC_24; 62 break; 63 case SNDRV_PCM_FORMAT_S32_BE: 64 mode = MPC52xx_PSC_SICR_SIM_CODEC_32; 65 break; 66 default: 67 dev_dbg(psc_dma->dev, "invalid format\n"); 68 return -EINVAL; 69 } 70 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); 71 72 return 0; 73 } 74 75 /** 76 * psc_i2s_set_sysclk: set the clock frequency and direction 77 * 78 * This function is called by the machine driver to tell us what the clock 79 * frequency and direction are. 80 * 81 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), 82 * and we don't care about the frequency. Return an error if the direction 83 * is not SND_SOC_CLOCK_IN. 84 * 85 * @clk_id: reserved, should be zero 86 * @freq: the frequency of the given clock ID, currently ignored 87 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) 88 */ 89 static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, 90 int clk_id, unsigned int freq, int dir) 91 { 92 struct psc_dma *psc_dma = cpu_dai->private_data; 93 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", 94 cpu_dai, dir); 95 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; 96 } 97 98 /** 99 * psc_i2s_set_fmt: set the serial format. 100 * 101 * This function is called by the machine driver to tell us what serial 102 * format to use. 103 * 104 * This driver only supports I2S mode. Return an error if the format is 105 * not SND_SOC_DAIFMT_I2S. 106 * 107 * @format: one of SND_SOC_DAIFMT_xxx 108 */ 109 static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) 110 { 111 struct psc_dma *psc_dma = cpu_dai->private_data; 112 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", 113 cpu_dai, format); 114 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; 115 } 116 117 /* --------------------------------------------------------------------- 118 * ALSA SoC Bindings 119 * 120 * - Digital Audio Interface (DAI) template 121 * - create/destroy dai hooks 122 */ 123 124 /** 125 * psc_i2s_dai_template: template CPU Digital Audio Interface 126 */ 127 static struct snd_soc_dai_ops psc_i2s_dai_ops = { 128 .hw_params = psc_i2s_hw_params, 129 .set_sysclk = psc_i2s_set_sysclk, 130 .set_fmt = psc_i2s_set_fmt, 131 }; 132 133 struct snd_soc_dai psc_i2s_dai[] = {{ 134 .name = "I2S", 135 .playback = { 136 .channels_min = 2, 137 .channels_max = 2, 138 .rates = PSC_I2S_RATES, 139 .formats = PSC_I2S_FORMATS, 140 }, 141 .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 EXPORT_SYMBOL_GPL(psc_i2s_dai); 150 151 /* --------------------------------------------------------------------- 152 * OF platform bus binding code: 153 * - Probe/remove operations 154 * - OF device match table 155 */ 156 static int __devinit psc_i2s_of_probe(struct of_device *op, 157 const struct of_device_id *match) 158 { 159 int rc; 160 struct psc_dma *psc_dma; 161 struct mpc52xx_psc __iomem *regs; 162 163 rc = mpc5200_audio_dma_create(op); 164 if (rc != 0) 165 return rc; 166 167 rc = snd_soc_register_dais(psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); 168 if (rc != 0) { 169 pr_err("Failed to register DAI\n"); 170 return 0; 171 } 172 173 psc_dma = dev_get_drvdata(&op->dev); 174 regs = psc_dma->psc_regs; 175 176 /* Configure the serial interface mode; defaulting to CODEC8 mode */ 177 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | 178 MPC52xx_PSC_SICR_CLKPOL; 179 out_be32(&psc_dma->psc_regs->sicr, 180 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); 181 182 /* Check for the codec handle. If it is not present then we 183 * are done */ 184 if (!of_get_property(op->node, "codec-handle", NULL)) 185 return 0; 186 187 /* Due to errata in the dma mode; need to line up enabling 188 * the transmitter with a transition on the frame sync 189 * line */ 190 191 /* first make sure it is low */ 192 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) 193 ; 194 /* then wait for the transition to high */ 195 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) 196 ; 197 /* Finally, enable the PSC. 198 * Receiver must always be enabled; even when we only want 199 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */ 200 201 /* Go */ 202 out_8(&psc_dma->psc_regs->command, 203 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); 204 205 return 0; 206 207 } 208 209 static int __devexit psc_i2s_of_remove(struct of_device *op) 210 { 211 return mpc5200_audio_dma_destroy(op); 212 } 213 214 /* Match table for of_platform binding */ 215 static struct of_device_id psc_i2s_match[] __devinitdata = { 216 { .compatible = "fsl,mpc5200-psc-i2s", }, 217 { .compatible = "fsl,mpc5200b-psc-i2s", }, 218 {} 219 }; 220 MODULE_DEVICE_TABLE(of, psc_i2s_match); 221 222 static struct of_platform_driver psc_i2s_driver = { 223 .match_table = psc_i2s_match, 224 .probe = psc_i2s_of_probe, 225 .remove = __devexit_p(psc_i2s_of_remove), 226 .driver = { 227 .name = "mpc5200-psc-i2s", 228 .owner = THIS_MODULE, 229 }, 230 }; 231 232 /* --------------------------------------------------------------------- 233 * Module setup and teardown; simply register the of_platform driver 234 * for the PSC in I2S mode. 235 */ 236 static int __init psc_i2s_init(void) 237 { 238 return of_register_platform_driver(&psc_i2s_driver); 239 } 240 module_init(psc_i2s_init); 241 242 static void __exit psc_i2s_exit(void) 243 { 244 of_unregister_platform_driver(&psc_i2s_driver); 245 } 246 module_exit(psc_i2s_exit); 247 248 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 249 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); 250 MODULE_LICENSE("GPL"); 251 252