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Linux/sound/soc/fsl/mpc5200_psc_i2s.c

  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_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 = substream->private_data;
 42         struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 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 };
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_get_property(op->dev.of_node, "codec-handle", NULL))
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(&regs->ipcr_acr.ipcr) & 0x80) != 0)
196                 ;
197         /* then wait for the transition to high */
198         while ((in_8(&regs->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 int psc_i2s_of_remove(struct platform_device *op)
213 {
214         mpc5200_audio_dma_destroy(op);
215         snd_soc_unregister_component(&op->dev);
216         return 0;
217 }
218 
219 /* Match table for of_platform binding */
220 static 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 = psc_i2s_of_remove,
230         .driver = {
231                 .name = "mpc5200-psc-i2s",
232                 .owner = THIS_MODULE,
233                 .of_match_table = psc_i2s_match,
234         },
235 };
236 
237 module_platform_driver(psc_i2s_driver);
238 
239 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
240 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
241 MODULE_LICENSE("GPL");
242 
243 

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