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dc641378 GL |
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. | |
dbcc3475 | 6 | * Copyright (C) 2009 Jon Smirl, Digispeaker |
dc641378 GL |
7 | */ |
8 | ||
dc641378 | 9 | #include <linux/module.h> |
dc641378 GL |
10 | #include <linux/of_device.h> |
11 | #include <linux/of_platform.h> | |
dc641378 | 12 | |
dc641378 GL |
13 | #include <sound/pcm.h> |
14 | #include <sound/pcm_params.h> | |
dc641378 | 15 | #include <sound/soc.h> |
dc641378 | 16 | |
dc641378 GL |
17 | #include <asm/mpc52xx_psc.h> |
18 | ||
89dd0842 JS |
19 | #include "mpc5200_dma.h" |
20 | ||
dc641378 GL |
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 | \ | |
dbcc3475 | 36 | SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) |
dc641378 | 37 | |
dc641378 | 38 | static int psc_i2s_hw_params(struct snd_pcm_substream *substream, |
dee89c4d MB |
39 | struct snd_pcm_hw_params *params, |
40 | struct snd_soc_dai *dai) | |
dc641378 GL |
41 | { |
42 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
f0fba2ad | 43 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); |
dc641378 GL |
44 | u32 mode; |
45 | ||
cebe7767 | 46 | dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" |
dc641378 GL |
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: | |
cebe7767 | 66 | dev_dbg(psc_dma->dev, "invalid format\n"); |
dc641378 GL |
67 | return -EINVAL; |
68 | } | |
cebe7767 | 69 | out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); |
dc641378 | 70 | |
dc641378 GL |
71 | return 0; |
72 | } | |
73 | ||
dc641378 GL |
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 | { | |
f0fba2ad | 91 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
cebe7767 | 92 | dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", |
dc641378 GL |
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 | { | |
f0fba2ad | 110 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
cebe7767 | 111 | dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", |
dc641378 GL |
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 | */ | |
85e7652d | 126 | static const struct snd_soc_dai_ops psc_i2s_dai_ops = { |
6335d055 | 127 | .hw_params = psc_i2s_hw_params, |
6335d055 EM |
128 | .set_sysclk = psc_i2s_set_sysclk, |
129 | .set_fmt = psc_i2s_set_fmt, | |
130 | }; | |
131 | ||
f0fba2ad | 132 | static struct snd_soc_dai_driver psc_i2s_dai[] = {{ |
a4f7b70d | 133 | .name = "mpc5200-psc-i2s.0", |
dc641378 | 134 | .playback = { |
a4f7b70d | 135 | .stream_name = "I2S Playback", |
dc641378 GL |
136 | .channels_min = 2, |
137 | .channels_max = 2, | |
138 | .rates = PSC_I2S_RATES, | |
139 | .formats = PSC_I2S_FORMATS, | |
140 | }, | |
141 | .capture = { | |
a4f7b70d | 142 | .stream_name = "I2S Capture", |
dc641378 GL |
143 | .channels_min = 2, |
144 | .channels_max = 2, | |
145 | .rates = PSC_I2S_RATES, | |
146 | .formats = PSC_I2S_FORMATS, | |
147 | }, | |
6335d055 | 148 | .ops = &psc_i2s_dai_ops, |
dbcc3475 | 149 | } }; |
dc641378 GL |
150 | |
151 | /* --------------------------------------------------------------------- | |
152 | * OF platform bus binding code: | |
153 | * - Probe/remove operations | |
154 | * - OF device match table | |
155 | */ | |
f07eb223 | 156 | static int __devinit psc_i2s_of_probe(struct platform_device *op) |
dc641378 | 157 | { |
dbcc3475 | 158 | int rc; |
cebe7767 | 159 | struct psc_dma *psc_dma; |
dbcc3475 | 160 | struct mpc52xx_psc __iomem *regs; |
dc641378 | 161 | |
f515b673 EM |
162 | rc = mpc5200_audio_dma_create(op); |
163 | if (rc != 0) | |
164 | return rc; | |
165 | ||
f0fba2ad | 166 | rc = snd_soc_register_dais(&op->dev, psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); |
dbcc3475 JS |
167 | if (rc != 0) { |
168 | pr_err("Failed to register DAI\n"); | |
1ebd0061 | 169 | return rc; |
dc641378 GL |
170 | } |
171 | ||
dbcc3475 JS |
172 | psc_dma = dev_get_drvdata(&op->dev); |
173 | regs = psc_dma->psc_regs; | |
dc641378 GL |
174 | |
175 | /* Configure the serial interface mode; defaulting to CODEC8 mode */ | |
cebe7767 | 176 | psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | |
dc641378 | 177 | MPC52xx_PSC_SICR_CLKPOL; |
cebe7767 JS |
178 | out_be32(&psc_dma->psc_regs->sicr, |
179 | psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); | |
dc641378 GL |
180 | |
181 | /* Check for the codec handle. If it is not present then we | |
182 | * are done */ | |
61c7a080 | 183 | if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) |
dc641378 GL |
184 | return 0; |
185 | ||
dbcc3475 JS |
186 | /* Due to errata in the dma mode; need to line up enabling |
187 | * the transmitter with a transition on the frame sync | |
188 | * line */ | |
189 | ||
190 | /* first make sure it is low */ | |
191 | while ((in_8(®s->ipcr_acr.ipcr) & 0x80) != 0) | |
192 | ; | |
193 | /* then wait for the transition to high */ | |
194 | while ((in_8(®s->ipcr_acr.ipcr) & 0x80) == 0) | |
195 | ; | |
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) */ | |
199 | ||
200 | /* Go */ | |
201 | out_8(&psc_dma->psc_regs->command, | |
202 | MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); | |
dc641378 GL |
203 | |
204 | return 0; | |
dbcc3475 | 205 | |
dc641378 GL |
206 | } |
207 | ||
2dc11581 | 208 | static int __devexit psc_i2s_of_remove(struct platform_device *op) |
dc641378 | 209 | { |
f515b673 | 210 | mpc5200_audio_dma_destroy(op); |
f0fba2ad LG |
211 | snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_i2s_dai)); |
212 | return 0; | |
dc641378 GL |
213 | } |
214 | ||
215 | /* Match table for of_platform binding */ | |
216 | static struct of_device_id psc_i2s_match[] __devinitdata = { | |
217 | { .compatible = "fsl,mpc5200-psc-i2s", }, | |
dbcc3475 | 218 | { .compatible = "fsl,mpc5200b-psc-i2s", }, |
dc641378 GL |
219 | {} |
220 | }; | |
221 | MODULE_DEVICE_TABLE(of, psc_i2s_match); | |
222 | ||
f07eb223 | 223 | static struct platform_driver psc_i2s_driver = { |
dc641378 GL |
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, | |
4018294b | 229 | .of_match_table = psc_i2s_match, |
dc641378 GL |
230 | }, |
231 | }; | |
232 | ||
ba0a7e02 | 233 | module_platform_driver(psc_i2s_driver); |
dc641378 | 234 | |
dbcc3475 JS |
235 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); |
236 | MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); | |
237 | MODULE_LICENSE("GPL"); | |
dc641378 | 238 |