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_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_5512 | SNDRV_PCM_RATE_8000_192000 | \ 30 SNDRV_PCM_RATE_CONTINUOUS) 31 32 /** 33 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode 34 */ 35 #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ 36 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) 37 38 static int psc_i2s_hw_params(struct snd_pcm_substream *substream, 39 struct snd_pcm_hw_params *params, 40 struct snd_soc_dai *dai) 41 { 42 struct snd_soc_pcm_runtime *rtd = substream->private_data; 43 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); 44 u32 mode; 45 46 dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" 47 " periods=%i buffer_size=%i buffer_bytes=%i\n", 48 __func__, substream, params_period_size(params), 49 params_period_bytes(params), params_periods(params), 50 params_buffer_size(params), params_buffer_bytes(params)); 51 52 switch (params_format(params)) { 53 case SNDRV_PCM_FORMAT_S8: 54 mode = MPC52xx_PSC_SICR_SIM_CODEC_8; 55 break; 56 case SNDRV_PCM_FORMAT_S16_BE: 57 mode = MPC52xx_PSC_SICR_SIM_CODEC_16; 58 break; 59 case SNDRV_PCM_FORMAT_S24_BE: 60 mode = MPC52xx_PSC_SICR_SIM_CODEC_24; 61 break; 62 case SNDRV_PCM_FORMAT_S32_BE: 63 mode = MPC52xx_PSC_SICR_SIM_CODEC_32; 64 break; 65 default: 66 dev_dbg(psc_dma->dev, "invalid format\n"); 67 return -EINVAL; 68 } 69 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); 70 71 return 0; 72 } 73 74 /** 75 * psc_i2s_set_sysclk: set the clock frequency and direction 76 * 77 * This function is called by the machine driver to tell us what the clock 78 * frequency and direction are. 79 * 80 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), 81 * and we don't care about the frequency. Return an error if the direction 82 * is not SND_SOC_CLOCK_IN. 83 * 84 * @clk_id: reserved, should be zero 85 * @freq: the frequency of the given clock ID, currently ignored 86 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) 87 */ 88 static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, 89 int clk_id, unsigned int freq, int dir) 90 { 91 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 92 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", 93 cpu_dai, dir); 94 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; 95 } 96 97 /** 98 * psc_i2s_set_fmt: set the serial format. 99 * 100 * This function is called by the machine driver to tell us what serial 101 * format to use. 102 * 103 * This driver only supports I2S mode. Return an error if the format is 104 * not SND_SOC_DAIFMT_I2S. 105 * 106 * @format: one of SND_SOC_DAIFMT_xxx 107 */ 108 static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) 109 { 110 struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); 111 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", 112 cpu_dai, format); 113 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; 114 } 115 116 /* --------------------------------------------------------------------- 117 * ALSA SoC Bindings 118 * 119 * - Digital Audio Interface (DAI) template 120 * - create/destroy dai hooks 121 */ 122 123 /** 124 * psc_i2s_dai_template: template CPU Digital Audio Interface 125 */ 126 static const struct snd_soc_dai_ops psc_i2s_dai_ops = { 127 .hw_params = psc_i2s_hw_params, 128 .set_sysclk = psc_i2s_set_sysclk, 129 .set_fmt = psc_i2s_set_fmt, 130 }; 131 132 static struct snd_soc_dai_driver psc_i2s_dai[] = {{ 133 .playback = { 134 .channels_min = 2, 135 .channels_max = 2, 136 .rates = PSC_I2S_RATES, 137 .formats = PSC_I2S_FORMATS, 138 }, 139 .capture = { 140 .channels_min = 2, 141 .channels_max = 2, 142 .rates = PSC_I2S_RATES, 143 .formats = PSC_I2S_FORMATS, 144 }, 145 .ops = &psc_i2s_dai_ops, 146 } }; 147 148 /* --------------------------------------------------------------------- 149 * OF platform bus binding code: 150 * - Probe/remove operations 151 * - OF device match table 152 */ 153 static int __devinit psc_i2s_of_probe(struct platform_device *op) 154 { 155 int rc; 156 struct psc_dma *psc_dma; 157 struct mpc52xx_psc __iomem *regs; 158 159 rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); 160 if (rc != 0) { 161 pr_err("Failed to register DAI\n"); 162 return rc; 163 } 164 165 psc_dma = dev_get_drvdata(&op->dev); 166 regs = psc_dma->psc_regs; 167 168 /* Configure the serial interface mode; defaulting to CODEC8 mode */ 169 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | 170 MPC52xx_PSC_SICR_CLKPOL; 171 out_be32(&psc_dma->psc_regs->sicr, 172 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); 173 174 /* Check for the codec handle. If it is not present then we 175 * are done */ 176 if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) 177 return 0; 178 179 /* Due to errata in the dma mode; need to line up enabling 180 * the transmitter with a transition on the frame sync 181 * line */ 182 183 /* first make sure it is low */ 184 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) 185 ; 186 /* then wait for the transition to high */ 187 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) 188 ; 189 /* Finally, enable the PSC. 190 * Receiver must always be enabled; even when we only want 191 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */ 192 193 /* Go */ 194 out_8(&psc_dma->psc_regs->command, 195 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); 196 197 return 0; 198 199 } 200 201 static int __devexit psc_i2s_of_remove(struct platform_device *op) 202 { 203 snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai)); 204 return 0; 205 } 206 207 /* Match table for of_platform binding */ 208 static struct of_device_id psc_i2s_match[] __devinitdata = { 209 { .compatible = "fsl,mpc5200-psc-i2s", }, 210 { .compatible = "fsl,mpc5200b-psc-i2s", }, 211 {} 212 }; 213 MODULE_DEVICE_TABLE(of, psc_i2s_match); 214 215 static struct platform_driver psc_i2s_driver = { 216 .probe = psc_i2s_of_probe, 217 .remove = __devexit_p(psc_i2s_of_remove), 218 .driver = { 219 .name = "mpc5200-psc-i2s", 220 .owner = THIS_MODULE, 221 .of_match_table = psc_i2s_match, 222 }, 223 }; 224 225 module_platform_driver(psc_i2s_driver); 226 227 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 228 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); 229 MODULE_LICENSE("GPL"); 230 231