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
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