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aef3b06a ML |
1 | /* |
2 | * Serial Sound Interface (I2S) support for SH7760/SH7780 | |
3 | * | |
4 | * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net> | |
5 | * | |
6 | * licensed under the terms outlined in the file COPYING at the root | |
7 | * of the linux kernel sources. | |
8 | * | |
9 | * dont forget to set IPSEL/OMSEL register bits (in your board code) to | |
10 | * enable SSI output pins! | |
11 | */ | |
12 | ||
13 | /* | |
14 | * LIMITATIONS: | |
15 | * The SSI unit has only one physical data line, so full duplex is | |
16 | * impossible. This can be remedied on the SH7760 by using the | |
17 | * other SSI unit for recording; however the SH7780 has only 1 SSI | |
18 | * unit, and its pins are shared with the AC97 unit, among others. | |
19 | * | |
20 | * FEATURES: | |
21 | * The SSI features "compressed mode": in this mode it continuously | |
22 | * streams PCM data over the I2S lines and uses LRCK as a handshake | |
23 | * signal. Can be used to send compressed data (AC3/DTS) to a DSP. | |
24 | * The number of bits sent over the wire in a frame can be adjusted | |
25 | * and can be independent from the actual sample bit depth. This is | |
26 | * useful to support TDM mode codecs like the AD1939 which have a | |
27 | * fixed TDM slot size, regardless of sample resolution. | |
28 | */ | |
29 | ||
30 | #include <linux/init.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/platform_device.h> | |
aef3b06a ML |
33 | #include <sound/core.h> |
34 | #include <sound/pcm.h> | |
35 | #include <sound/initval.h> | |
36 | #include <sound/soc.h> | |
37 | #include <asm/io.h> | |
38 | ||
39 | #define SSICR 0x00 | |
40 | #define SSISR 0x04 | |
41 | ||
42 | #define CR_DMAEN (1 << 28) | |
43 | #define CR_CHNL_SHIFT 22 | |
44 | #define CR_CHNL_MASK (3 << CR_CHNL_SHIFT) | |
45 | #define CR_DWL_SHIFT 19 | |
46 | #define CR_DWL_MASK (7 << CR_DWL_SHIFT) | |
47 | #define CR_SWL_SHIFT 16 | |
48 | #define CR_SWL_MASK (7 << CR_SWL_SHIFT) | |
49 | #define CR_SCK_MASTER (1 << 15) /* bitclock master bit */ | |
50 | #define CR_SWS_MASTER (1 << 14) /* wordselect master bit */ | |
51 | #define CR_SCKP (1 << 13) /* I2Sclock polarity */ | |
52 | #define CR_SWSP (1 << 12) /* LRCK polarity */ | |
53 | #define CR_SPDP (1 << 11) | |
54 | #define CR_SDTA (1 << 10) /* i2s alignment (msb/lsb) */ | |
55 | #define CR_PDTA (1 << 9) /* fifo data alignment */ | |
56 | #define CR_DEL (1 << 8) /* delay data by 1 i2sclk */ | |
57 | #define CR_BREN (1 << 7) /* clock gating in burst mode */ | |
58 | #define CR_CKDIV_SHIFT 4 | |
59 | #define CR_CKDIV_MASK (7 << CR_CKDIV_SHIFT) /* bitclock divider */ | |
60 | #define CR_MUTE (1 << 3) /* SSI mute */ | |
61 | #define CR_CPEN (1 << 2) /* compressed mode */ | |
62 | #define CR_TRMD (1 << 1) /* transmit/receive select */ | |
63 | #define CR_EN (1 << 0) /* enable SSI */ | |
64 | ||
65 | #define SSIREG(reg) (*(unsigned long *)(ssi->mmio + (reg))) | |
66 | ||
67 | struct ssi_priv { | |
68 | unsigned long mmio; | |
69 | unsigned long sysclk; | |
70 | int inuse; | |
71 | } ssi_cpu_data[] = { | |
72 | #if defined(CONFIG_CPU_SUBTYPE_SH7760) | |
73 | { | |
74 | .mmio = 0xFE680000, | |
75 | }, | |
76 | { | |
77 | .mmio = 0xFE690000, | |
78 | }, | |
79 | #elif defined(CONFIG_CPU_SUBTYPE_SH7780) | |
80 | { | |
81 | .mmio = 0xFFE70000, | |
82 | }, | |
83 | #else | |
84 | #error "Unsupported SuperH SoC" | |
85 | #endif | |
86 | }; | |
87 | ||
88 | /* | |
89 | * track usage of the SSI; it is simplex-only so prevent attempts of | |
90 | * concurrent playback + capture. FIXME: any locking required? | |
91 | */ | |
dee89c4d MB |
92 | static int ssi_startup(struct snd_pcm_substream *substream, |
93 | struct snd_soc_dai *dai) | |
aef3b06a | 94 | { |
f0fba2ad | 95 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; |
aef3b06a ML |
96 | if (ssi->inuse) { |
97 | pr_debug("ssi: already in use!\n"); | |
98 | return -EBUSY; | |
99 | } else | |
100 | ssi->inuse = 1; | |
101 | return 0; | |
102 | } | |
103 | ||
dee89c4d MB |
104 | static void ssi_shutdown(struct snd_pcm_substream *substream, |
105 | struct snd_soc_dai *dai) | |
aef3b06a | 106 | { |
f0fba2ad | 107 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; |
aef3b06a ML |
108 | |
109 | ssi->inuse = 0; | |
110 | } | |
111 | ||
dee89c4d MB |
112 | static int ssi_trigger(struct snd_pcm_substream *substream, int cmd, |
113 | struct snd_soc_dai *dai) | |
aef3b06a | 114 | { |
f0fba2ad | 115 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; |
aef3b06a ML |
116 | |
117 | switch (cmd) { | |
118 | case SNDRV_PCM_TRIGGER_START: | |
119 | SSIREG(SSICR) |= CR_DMAEN | CR_EN; | |
120 | break; | |
121 | case SNDRV_PCM_TRIGGER_STOP: | |
122 | SSIREG(SSICR) &= ~(CR_DMAEN | CR_EN); | |
123 | break; | |
124 | default: | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int ssi_hw_params(struct snd_pcm_substream *substream, | |
dee89c4d MB |
132 | struct snd_pcm_hw_params *params, |
133 | struct snd_soc_dai *dai) | |
aef3b06a | 134 | { |
f0fba2ad | 135 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; |
aef3b06a ML |
136 | unsigned long ssicr = SSIREG(SSICR); |
137 | unsigned int bits, channels, swl, recv, i; | |
138 | ||
139 | channels = params_channels(params); | |
140 | bits = params->msbits; | |
141 | recv = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 0 : 1; | |
142 | ||
143 | pr_debug("ssi_hw_params() enter\nssicr was %08lx\n", ssicr); | |
449bd54d | 144 | pr_debug("bits: %u channels: %u\n", bits, channels); |
aef3b06a ML |
145 | |
146 | ssicr &= ~(CR_TRMD | CR_CHNL_MASK | CR_DWL_MASK | CR_PDTA | | |
147 | CR_SWL_MASK); | |
148 | ||
149 | /* direction (send/receive) */ | |
150 | if (!recv) | |
151 | ssicr |= CR_TRMD; /* transmit */ | |
152 | ||
153 | /* channels */ | |
154 | if ((channels < 2) || (channels > 8) || (channels & 1)) { | |
155 | pr_debug("ssi: invalid number of channels\n"); | |
156 | return -EINVAL; | |
157 | } | |
158 | ssicr |= ((channels >> 1) - 1) << CR_CHNL_SHIFT; | |
159 | ||
160 | /* DATA WORD LENGTH (DWL): databits in audio sample */ | |
161 | i = 0; | |
162 | switch (bits) { | |
163 | case 32: ++i; | |
164 | case 24: ++i; | |
165 | case 22: ++i; | |
166 | case 20: ++i; | |
167 | case 18: ++i; | |
168 | case 16: ++i; | |
169 | ssicr |= i << CR_DWL_SHIFT; | |
170 | case 8: break; | |
171 | default: | |
172 | pr_debug("ssi: invalid sample width\n"); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | /* | |
177 | * SYSTEM WORD LENGTH: size in bits of half a frame over the I2S | |
178 | * wires. This is usually bits_per_sample x channels/2; i.e. in | |
179 | * Stereo mode the SWL equals DWL. SWL can be bigger than the | |
180 | * product of (channels_per_slot x samplebits), e.g. for codecs | |
181 | * like the AD1939 which only accept 32bit wide TDM slots. For | |
182 | * "standard" I2S operation we set SWL = chans / 2 * DWL here. | |
183 | * Waiting for ASoC to get TDM support ;-) | |
184 | */ | |
185 | if ((bits > 16) && (bits <= 24)) { | |
186 | bits = 24; /* these are padded by the SSI */ | |
187 | /*ssicr |= CR_PDTA;*/ /* cpu/data endianness ? */ | |
188 | } | |
189 | i = 0; | |
190 | swl = (bits * channels) / 2; | |
191 | switch (swl) { | |
192 | case 256: ++i; | |
193 | case 128: ++i; | |
194 | case 64: ++i; | |
195 | case 48: ++i; | |
196 | case 32: ++i; | |
197 | case 16: ++i; | |
198 | ssicr |= i << CR_SWL_SHIFT; | |
199 | case 8: break; | |
200 | default: | |
201 | pr_debug("ssi: invalid system word length computed\n"); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | SSIREG(SSICR) = ssicr; | |
206 | ||
207 | pr_debug("ssi_hw_params() leave\nssicr is now %08lx\n", ssicr); | |
208 | return 0; | |
209 | } | |
210 | ||
53640650 | 211 | static int ssi_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, |
aef3b06a ML |
212 | unsigned int freq, int dir) |
213 | { | |
214 | struct ssi_priv *ssi = &ssi_cpu_data[cpu_dai->id]; | |
215 | ||
216 | ssi->sysclk = freq; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
222 | * This divider is used to generate the SSI_SCK (I2S bitclock) from the | |
223 | * clock at the HAC_BIT_CLK ("oversampling clock") pin. | |
224 | */ | |
53640650 | 225 | static int ssi_set_clkdiv(struct snd_soc_dai *dai, int did, int div) |
aef3b06a ML |
226 | { |
227 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; | |
228 | unsigned long ssicr; | |
229 | int i; | |
230 | ||
231 | i = 0; | |
232 | ssicr = SSIREG(SSICR) & ~CR_CKDIV_MASK; | |
233 | switch (div) { | |
234 | case 16: ++i; | |
235 | case 8: ++i; | |
236 | case 4: ++i; | |
237 | case 2: ++i; | |
238 | SSIREG(SSICR) = ssicr | (i << CR_CKDIV_SHIFT); | |
239 | case 1: break; | |
240 | default: | |
241 | pr_debug("ssi: invalid sck divider %d\n", div); | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
53640650 | 248 | static int ssi_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) |
aef3b06a ML |
249 | { |
250 | struct ssi_priv *ssi = &ssi_cpu_data[dai->id]; | |
251 | unsigned long ssicr = SSIREG(SSICR); | |
252 | ||
253 | pr_debug("ssi_set_fmt()\nssicr was 0x%08lx\n", ssicr); | |
254 | ||
255 | ssicr &= ~(CR_DEL | CR_PDTA | CR_BREN | CR_SWSP | CR_SCKP | | |
256 | CR_SWS_MASTER | CR_SCK_MASTER); | |
257 | ||
258 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
259 | case SND_SOC_DAIFMT_I2S: | |
260 | break; | |
261 | case SND_SOC_DAIFMT_RIGHT_J: | |
262 | ssicr |= CR_DEL | CR_PDTA; | |
263 | break; | |
264 | case SND_SOC_DAIFMT_LEFT_J: | |
265 | ssicr |= CR_DEL; | |
266 | break; | |
267 | default: | |
268 | pr_debug("ssi: unsupported format\n"); | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) { | |
273 | case SND_SOC_DAIFMT_CONT: | |
274 | break; | |
275 | case SND_SOC_DAIFMT_GATED: | |
276 | ssicr |= CR_BREN; | |
277 | break; | |
278 | } | |
279 | ||
280 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
281 | case SND_SOC_DAIFMT_NB_NF: | |
282 | ssicr |= CR_SCKP; /* sample data at low clkedge */ | |
283 | break; | |
284 | case SND_SOC_DAIFMT_NB_IF: | |
285 | ssicr |= CR_SCKP | CR_SWSP; | |
286 | break; | |
287 | case SND_SOC_DAIFMT_IB_NF: | |
288 | break; | |
289 | case SND_SOC_DAIFMT_IB_IF: | |
290 | ssicr |= CR_SWSP; /* word select starts low */ | |
291 | break; | |
292 | default: | |
293 | pr_debug("ssi: invalid inversion\n"); | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
297 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
298 | case SND_SOC_DAIFMT_CBM_CFM: | |
299 | break; | |
300 | case SND_SOC_DAIFMT_CBS_CFM: | |
301 | ssicr |= CR_SCK_MASTER; | |
302 | break; | |
303 | case SND_SOC_DAIFMT_CBM_CFS: | |
304 | ssicr |= CR_SWS_MASTER; | |
305 | break; | |
306 | case SND_SOC_DAIFMT_CBS_CFS: | |
307 | ssicr |= CR_SWS_MASTER | CR_SCK_MASTER; | |
308 | break; | |
309 | default: | |
310 | pr_debug("ssi: invalid master/slave configuration\n"); | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | SSIREG(SSICR) = ssicr; | |
315 | pr_debug("ssi_set_fmt() leave\nssicr is now 0x%08lx\n", ssicr); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | /* the SSI depends on an external clocksource (at HAC_BIT_CLK) even in | |
321 | * Master mode, so really this is board specific; the SSI can do any | |
322 | * rate with the right bitclk and divider settings. | |
323 | */ | |
324 | #define SSI_RATES \ | |
325 | SNDRV_PCM_RATE_8000_192000 | |
326 | ||
327 | /* the SSI can do 8-32 bit samples, with 8 possible channels */ | |
328 | #define SSI_FMTS \ | |
329 | (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \ | |
330 | SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE | \ | |
331 | SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE | \ | |
332 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3LE | \ | |
333 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE) | |
334 | ||
85e7652d | 335 | static const struct snd_soc_dai_ops ssi_dai_ops = { |
6335d055 EM |
336 | .startup = ssi_startup, |
337 | .shutdown = ssi_shutdown, | |
338 | .trigger = ssi_trigger, | |
339 | .hw_params = ssi_hw_params, | |
340 | .set_sysclk = ssi_set_sysclk, | |
341 | .set_clkdiv = ssi_set_clkdiv, | |
342 | .set_fmt = ssi_set_fmt, | |
343 | }; | |
344 | ||
8fccf469 | 345 | static struct snd_soc_dai_driver sh4_ssi_dai[] = { |
aef3b06a | 346 | { |
f0fba2ad | 347 | .name = "ssi-dai.0", |
aef3b06a ML |
348 | .playback = { |
349 | .rates = SSI_RATES, | |
350 | .formats = SSI_FMTS, | |
351 | .channels_min = 2, | |
352 | .channels_max = 8, | |
353 | }, | |
354 | .capture = { | |
355 | .rates = SSI_RATES, | |
356 | .formats = SSI_FMTS, | |
357 | .channels_min = 2, | |
358 | .channels_max = 8, | |
359 | }, | |
6335d055 | 360 | .ops = &ssi_dai_ops, |
aef3b06a ML |
361 | }, |
362 | #ifdef CONFIG_CPU_SUBTYPE_SH7760 | |
363 | { | |
f0fba2ad | 364 | .name = "ssi-dai.1", |
aef3b06a ML |
365 | .playback = { |
366 | .rates = SSI_RATES, | |
367 | .formats = SSI_FMTS, | |
368 | .channels_min = 2, | |
369 | .channels_max = 8, | |
370 | }, | |
371 | .capture = { | |
372 | .rates = SSI_RATES, | |
373 | .formats = SSI_FMTS, | |
374 | .channels_min = 2, | |
375 | .channels_max = 8, | |
376 | }, | |
6335d055 | 377 | .ops = &ssi_dai_ops, |
aef3b06a ML |
378 | }, |
379 | #endif | |
380 | }; | |
aef3b06a | 381 | |
f0fba2ad LG |
382 | static int __devinit sh4_soc_dai_probe(struct platform_device *pdev) |
383 | { | |
384 | return snd_soc_register_dais(&pdev->dev, sh4_ssi_dai, | |
385 | ARRAY_SIZE(sh4_ssi_dai)); | |
386 | } | |
387 | ||
388 | static int __devexit sh4_soc_dai_remove(struct platform_device *pdev) | |
389 | { | |
3b6bc354 | 390 | snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(sh4_ssi_dai)); |
f0fba2ad LG |
391 | return 0; |
392 | } | |
393 | ||
394 | static struct platform_driver sh4_ssi_driver = { | |
395 | .driver = { | |
396 | .name = "sh4-ssi-dai", | |
397 | .owner = THIS_MODULE, | |
398 | }, | |
399 | ||
400 | .probe = sh4_soc_dai_probe, | |
401 | .remove = __devexit_p(sh4_soc_dai_remove), | |
402 | }; | |
403 | ||
404 | static int __init snd_sh4_ssi_init(void) | |
3f4b783c | 405 | { |
f0fba2ad | 406 | return platform_driver_register(&sh4_ssi_driver); |
3f4b783c | 407 | } |
f0fba2ad | 408 | module_init(snd_sh4_ssi_init); |
3f4b783c | 409 | |
f0fba2ad | 410 | static void __exit snd_sh4_ssi_exit(void) |
3f4b783c | 411 | { |
f0fba2ad | 412 | platform_driver_unregister(&sh4_ssi_driver); |
3f4b783c | 413 | } |
f0fba2ad | 414 | module_exit(snd_sh4_ssi_exit); |
3f4b783c | 415 | |
aef3b06a ML |
416 | MODULE_LICENSE("GPL"); |
417 | MODULE_DESCRIPTION("SuperH onchip SSI (I2S) audio driver"); | |
418 | MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>"); |