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Linux/sound/soc/fsl/mpc5200_psc_i2s.c

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  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         .name = "mpc5200-psc-i2s.0",
134         .playback = {
135                 .stream_name = "I2S Playback",
136                 .channels_min = 2,
137                 .channels_max = 2,
138                 .rates = PSC_I2S_RATES,
139                 .formats = PSC_I2S_FORMATS,
140         },
141         .capture = {
142                 .stream_name = "I2S Capture",
143                 .channels_min = 2,
144                 .channels_max = 2,
145                 .rates = PSC_I2S_RATES,
146                 .formats = PSC_I2S_FORMATS,
147         },
148         .ops = &psc_i2s_dai_ops,
149 } };
150 
151 static const struct snd_soc_component_driver psc_i2s_component = {
152         .name           = "mpc5200-i2s",
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(&regs->ipcr_acr.ipcr) & 0x80) != 0)
197                 ;
198         /* then wait for the transition to high */
199         while ((in_8(&regs->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 int psc_i2s_of_remove(struct platform_device *op)
214 {
215         mpc5200_audio_dma_destroy(op);
216         snd_soc_unregister_component(&op->dev);
217         return 0;
218 }
219 
220 /* Match table for of_platform binding */
221 static struct of_device_id psc_i2s_match[] = {
222         { .compatible = "fsl,mpc5200-psc-i2s", },
223         { .compatible = "fsl,mpc5200b-psc-i2s", },
224         {}
225 };
226 MODULE_DEVICE_TABLE(of, psc_i2s_match);
227 
228 static struct platform_driver psc_i2s_driver = {
229         .probe = psc_i2s_of_probe,
230         .remove = psc_i2s_of_remove,
231         .driver = {
232                 .name = "mpc5200-psc-i2s",
233                 .owner = THIS_MODULE,
234                 .of_match_table = psc_i2s_match,
235         },
236 };
237 
238 module_platform_driver(psc_i2s_driver);
239 
240 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
241 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
242 MODULE_LICENSE("GPL");
243 
244 

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