2 * Freescale MPC5200 PSC in I2S mode
3 * ALSA SoC Digital Audio Interface (DAI) driver
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
6 * Copyright (C) 2009 Jon Smirl, Digispeaker
9 #include <linux/module.h>
10 #include <linux/of_device.h>
11 #include <linux/of_platform.h>
13 #include <sound/pcm.h>
14 #include <sound/pcm_params.h>
15 #include <sound/soc.h>
17 #include <asm/mpc52xx_psc.h>
19 #include "mpc5200_dma.h"
22 * PSC_I2S_RATES: sample rates supported by the I2S
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.
29 #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
30 SNDRV_PCM_RATE_CONTINUOUS)
33 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
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)
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)
42 struct snd_soc_pcm_runtime *rtd = substream->private_data;
43 struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
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));
52 switch (params_format(params)) {
53 case SNDRV_PCM_FORMAT_S8:
54 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
56 case SNDRV_PCM_FORMAT_S16_BE:
57 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
59 case SNDRV_PCM_FORMAT_S24_BE:
60 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
62 case SNDRV_PCM_FORMAT_S32_BE:
63 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
66 dev_dbg(psc_dma->dev, "invalid format\n");
69 out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);
75 * psc_i2s_set_sysclk: set the clock frequency and direction
77 * This function is called by the machine driver to tell us what the clock
78 * frequency and direction are.
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.
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)
88 static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
89 int clk_id, unsigned int freq, int dir)
91 struct psc_dma *psc_dma = cpu_dai->private_data;
92 dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
94 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
98 * psc_i2s_set_fmt: set the serial format.
100 * This function is called by the machine driver to tell us what serial
103 * This driver only supports I2S mode. Return an error if the format is
104 * not SND_SOC_DAIFMT_I2S.
106 * @format: one of SND_SOC_DAIFMT_xxx
108 static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
110 struct psc_dma *psc_dma = cpu_dai->private_data;
111 dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
113 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
116 /* ---------------------------------------------------------------------
119 * - Digital Audio Interface (DAI) template
120 * - create/destroy dai hooks
124 * psc_i2s_dai_template: template CPU Digital Audio Interface
126 static 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,
132 struct snd_soc_dai psc_i2s_dai[] = {{
137 .rates = PSC_I2S_RATES,
138 .formats = PSC_I2S_FORMATS,
143 .rates = PSC_I2S_RATES,
144 .formats = PSC_I2S_FORMATS,
146 .ops = &psc_i2s_dai_ops,
148 EXPORT_SYMBOL_GPL(psc_i2s_dai);
150 /* ---------------------------------------------------------------------
151 * OF platform bus binding code:
152 * - Probe/remove operations
153 * - OF device match table
155 static int __devinit psc_i2s_of_probe(struct of_device *op,
156 const struct of_device_id *match)
159 struct psc_dma *psc_dma;
160 struct mpc52xx_psc __iomem *regs;
162 rc = mpc5200_audio_dma_create(op);
166 rc = snd_soc_register_dais(psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai));
168 pr_err("Failed to register DAI\n");
172 psc_dma = dev_get_drvdata(&op->dev);
173 regs = psc_dma->psc_regs;
175 /* Configure the serial interface mode; defaulting to CODEC8 mode */
176 psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
177 MPC52xx_PSC_SICR_CLKPOL;
178 out_be32(&psc_dma->psc_regs->sicr,
179 psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
181 /* Check for the codec handle. If it is not present then we
183 if (!of_get_property(op->dev.of_node, "codec-handle", NULL))
186 /* Due to errata in the dma mode; need to line up enabling
187 * the transmitter with a transition on the frame sync
190 /* first make sure it is low */
191 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0)
193 /* then wait for the transition to high */
194 while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0)
196 /* Finally, enable the PSC.
197 * Receiver must always be enabled; even when we only want
198 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
201 out_8(&psc_dma->psc_regs->command,
202 MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
208 static int __devexit psc_i2s_of_remove(struct of_device *op)
210 return mpc5200_audio_dma_destroy(op);
213 /* Match table for of_platform binding */
214 static struct of_device_id psc_i2s_match[] __devinitdata = {
215 { .compatible = "fsl,mpc5200-psc-i2s", },
216 { .compatible = "fsl,mpc5200b-psc-i2s", },
219 MODULE_DEVICE_TABLE(of, psc_i2s_match);
221 static struct of_platform_driver psc_i2s_driver = {
222 .probe = psc_i2s_of_probe,
223 .remove = __devexit_p(psc_i2s_of_remove),
225 .name = "mpc5200-psc-i2s",
226 .owner = THIS_MODULE,
227 .of_match_table = psc_i2s_match,
231 /* ---------------------------------------------------------------------
232 * Module setup and teardown; simply register the of_platform driver
233 * for the PSC in I2S mode.
235 static int __init psc_i2s_init(void)
237 return of_register_platform_driver(&psc_i2s_driver);
239 module_init(psc_i2s_init);
241 static void __exit psc_i2s_exit(void)
243 of_unregister_platform_driver(&psc_i2s_driver);
245 module_exit(psc_i2s_exit);
247 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
248 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
249 MODULE_LICENSE("GPL");