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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 | */ | |
24710c97 | 29 | #define PSC_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS |
dc641378 GL |
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 | \ | |
dbcc3475 | 35 | SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) |
dc641378 | 36 | |
dc641378 | 37 | static int psc_i2s_hw_params(struct snd_pcm_substream *substream, |
dee89c4d MB |
38 | struct snd_pcm_hw_params *params, |
39 | struct snd_soc_dai *dai) | |
dc641378 GL |
40 | { |
41 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
f0fba2ad | 42 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(rtd->cpu_dai); |
dc641378 GL |
43 | u32 mode; |
44 | ||
cebe7767 | 45 | dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" |
dc641378 GL |
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: | |
cebe7767 | 65 | dev_dbg(psc_dma->dev, "invalid format\n"); |
dc641378 GL |
66 | return -EINVAL; |
67 | } | |
cebe7767 | 68 | out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode); |
dc641378 | 69 | |
dc641378 GL |
70 | return 0; |
71 | } | |
72 | ||
dc641378 GL |
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 | { | |
f0fba2ad | 90 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
cebe7767 | 91 | dev_dbg(psc_dma->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", |
dc641378 GL |
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 | { | |
f0fba2ad | 109 | struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); |
cebe7767 | 110 | dev_dbg(psc_dma->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", |
dc641378 GL |
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 | */ | |
85e7652d | 125 | static const struct snd_soc_dai_ops psc_i2s_dai_ops = { |
6335d055 | 126 | .hw_params = psc_i2s_hw_params, |
6335d055 EM |
127 | .set_sysclk = psc_i2s_set_sysclk, |
128 | .set_fmt = psc_i2s_set_fmt, | |
129 | }; | |
130 | ||
f0fba2ad | 131 | static struct snd_soc_dai_driver psc_i2s_dai[] = {{ |
a4f7b70d | 132 | .name = "mpc5200-psc-i2s.0", |
dc641378 | 133 | .playback = { |
a4f7b70d | 134 | .stream_name = "I2S Playback", |
dc641378 GL |
135 | .channels_min = 2, |
136 | .channels_max = 2, | |
137 | .rates = PSC_I2S_RATES, | |
138 | .formats = PSC_I2S_FORMATS, | |
139 | }, | |
140 | .capture = { | |
a4f7b70d | 141 | .stream_name = "I2S Capture", |
dc641378 GL |
142 | .channels_min = 2, |
143 | .channels_max = 2, | |
144 | .rates = PSC_I2S_RATES, | |
145 | .formats = PSC_I2S_FORMATS, | |
146 | }, | |
6335d055 | 147 | .ops = &psc_i2s_dai_ops, |
dbcc3475 | 148 | } }; |
dc641378 | 149 | |
f200c02b KM |
150 | static const struct snd_soc_component_driver psc_i2s_component = { |
151 | .name = "mpc5200-i2s", | |
152 | }; | |
153 | ||
dc641378 GL |
154 | /* --------------------------------------------------------------------- |
155 | * OF platform bus binding code: | |
156 | * - Probe/remove operations | |
157 | * - OF device match table | |
158 | */ | |
a0a3d518 | 159 | static int psc_i2s_of_probe(struct platform_device *op) |
dc641378 | 160 | { |
dbcc3475 | 161 | int rc; |
cebe7767 | 162 | struct psc_dma *psc_dma; |
dbcc3475 | 163 | struct mpc52xx_psc __iomem *regs; |
dc641378 | 164 | |
f515b673 EM |
165 | rc = mpc5200_audio_dma_create(op); |
166 | if (rc != 0) | |
167 | return rc; | |
168 | ||
f200c02b KM |
169 | rc = snd_soc_register_component(&op->dev, &psc_i2s_component, |
170 | psc_i2s_dai, ARRAY_SIZE(psc_i2s_dai)); | |
dbcc3475 JS |
171 | if (rc != 0) { |
172 | pr_err("Failed to register DAI\n"); | |
1ebd0061 | 173 | return rc; |
dc641378 GL |
174 | } |
175 | ||
dbcc3475 JS |
176 | psc_dma = dev_get_drvdata(&op->dev); |
177 | regs = psc_dma->psc_regs; | |
dc641378 GL |
178 | |
179 | /* Configure the serial interface mode; defaulting to CODEC8 mode */ | |
cebe7767 | 180 | psc_dma->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | |
dc641378 | 181 | MPC52xx_PSC_SICR_CLKPOL; |
cebe7767 JS |
182 | out_be32(&psc_dma->psc_regs->sicr, |
183 | psc_dma->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); | |
dc641378 GL |
184 | |
185 | /* Check for the codec handle. If it is not present then we | |
186 | * are done */ | |
61c7a080 | 187 | if (!of_get_property(op->dev.of_node, "codec-handle", NULL)) |
dc641378 GL |
188 | return 0; |
189 | ||
dbcc3475 JS |
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(®s->ipcr_acr.ipcr) & 0x80) != 0) | |
196 | ; | |
197 | /* then wait for the transition to high */ | |
198 | while ((in_8(®s->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); | |
dc641378 GL |
207 | |
208 | return 0; | |
dbcc3475 | 209 | |
dc641378 GL |
210 | } |
211 | ||
a0a3d518 | 212 | static int psc_i2s_of_remove(struct platform_device *op) |
dc641378 | 213 | { |
f515b673 | 214 | mpc5200_audio_dma_destroy(op); |
f200c02b | 215 | snd_soc_unregister_component(&op->dev); |
f0fba2ad | 216 | return 0; |
dc641378 GL |
217 | } |
218 | ||
219 | /* Match table for of_platform binding */ | |
6ffa84df | 220 | static const struct of_device_id psc_i2s_match[] = { |
dc641378 | 221 | { .compatible = "fsl,mpc5200-psc-i2s", }, |
dbcc3475 | 222 | { .compatible = "fsl,mpc5200b-psc-i2s", }, |
dc641378 GL |
223 | {} |
224 | }; | |
225 | MODULE_DEVICE_TABLE(of, psc_i2s_match); | |
226 | ||
f07eb223 | 227 | static struct platform_driver psc_i2s_driver = { |
dc641378 | 228 | .probe = psc_i2s_of_probe, |
a0a3d518 | 229 | .remove = psc_i2s_of_remove, |
dc641378 GL |
230 | .driver = { |
231 | .name = "mpc5200-psc-i2s", | |
4018294b | 232 | .of_match_table = psc_i2s_match, |
dc641378 GL |
233 | }, |
234 | }; | |
235 | ||
ba0a7e02 | 236 | module_platform_driver(psc_i2s_driver); |
dc641378 | 237 | |
dbcc3475 JS |
238 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); |
239 | MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); | |
240 | MODULE_LICENSE("GPL"); | |
dc641378 | 241 |