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43550821 XL |
1 | /* |
2 | * Freescale ALSA SoC Digital Audio Interface (SAI) driver. | |
3 | * | |
4 | * Copyright 2012-2013 Freescale Semiconductor, Inc. | |
5 | * | |
6 | * This program is free software, you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation, either version 2 of the License, or(at your | |
9 | * option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_address.h> | |
18 | #include <linux/slab.h> | |
19 | #include <sound/core.h> | |
20 | #include <sound/dmaengine_pcm.h> | |
21 | #include <sound/pcm_params.h> | |
22 | ||
23 | #include "fsl_sai.h" | |
24 | ||
25 | static inline u32 sai_readl(struct fsl_sai *sai, | |
26 | const void __iomem *addr) | |
27 | { | |
28 | u32 val; | |
29 | ||
30 | val = __raw_readl(addr); | |
31 | ||
32 | if (likely(sai->big_endian_regs)) | |
33 | val = be32_to_cpu(val); | |
34 | else | |
35 | val = le32_to_cpu(val); | |
36 | rmb(); | |
37 | ||
38 | return val; | |
39 | } | |
40 | ||
41 | static inline void sai_writel(struct fsl_sai *sai, | |
42 | u32 val, void __iomem *addr) | |
43 | { | |
44 | wmb(); | |
45 | if (likely(sai->big_endian_regs)) | |
46 | val = cpu_to_be32(val); | |
47 | else | |
48 | val = cpu_to_le32(val); | |
49 | ||
50 | __raw_writel(val, addr); | |
51 | } | |
52 | ||
53 | static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai, | |
54 | int clk_id, unsigned int freq, int fsl_dir) | |
55 | { | |
56 | u32 val_cr2, reg_cr2; | |
57 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
58 | ||
59 | if (fsl_dir == FSL_FMT_TRANSMITTER) | |
60 | reg_cr2 = FSL_SAI_TCR2; | |
61 | else | |
62 | reg_cr2 = FSL_SAI_RCR2; | |
63 | ||
64 | val_cr2 = sai_readl(sai, sai->base + reg_cr2); | |
65 | switch (clk_id) { | |
66 | case FSL_SAI_CLK_BUS: | |
67 | val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK; | |
68 | val_cr2 |= FSL_SAI_CR2_MSEL_BUS; | |
69 | break; | |
70 | case FSL_SAI_CLK_MAST1: | |
71 | val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK; | |
72 | val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1; | |
73 | break; | |
74 | case FSL_SAI_CLK_MAST2: | |
75 | val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK; | |
76 | val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2; | |
77 | break; | |
78 | case FSL_SAI_CLK_MAST3: | |
79 | val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK; | |
80 | val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3; | |
81 | break; | |
82 | default: | |
83 | return -EINVAL; | |
84 | } | |
85 | sai_writel(sai, val_cr2, sai->base + reg_cr2); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai, | |
91 | int clk_id, unsigned int freq, int dir) | |
92 | { | |
93 | int ret; | |
94 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
95 | ||
96 | if (dir == SND_SOC_CLOCK_IN) | |
97 | return 0; | |
98 | ||
99 | ret = clk_prepare_enable(sai->clk); | |
100 | if (ret) | |
101 | return ret; | |
102 | ||
103 | sai_writel(sai, 0x0, sai->base + FSL_SAI_RCSR); | |
104 | sai_writel(sai, 0x0, sai->base + FSL_SAI_TCSR); | |
105 | sai_writel(sai, FSL_SAI_MAXBURST_TX * 2, sai->base + FSL_SAI_TCR1); | |
106 | sai_writel(sai, FSL_SAI_MAXBURST_RX - 1, sai->base + FSL_SAI_RCR1); | |
107 | ||
108 | ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq, | |
109 | FSL_FMT_TRANSMITTER); | |
110 | if (ret) { | |
111 | dev_err(cpu_dai->dev, | |
112 | "Cannot set SAI's transmitter sysclk: %d\n", | |
113 | ret); | |
1fb2d9d7 | 114 | goto err_clk; |
43550821 XL |
115 | } |
116 | ||
117 | ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq, | |
118 | FSL_FMT_RECEIVER); | |
119 | if (ret) { | |
120 | dev_err(cpu_dai->dev, | |
121 | "Cannot set SAI's receiver sysclk: %d\n", | |
122 | ret); | |
1fb2d9d7 | 123 | goto err_clk; |
43550821 XL |
124 | } |
125 | ||
1fb2d9d7 | 126 | err_clk: |
43550821 XL |
127 | clk_disable_unprepare(sai->clk); |
128 | ||
1fb2d9d7 | 129 | return ret; |
43550821 XL |
130 | } |
131 | ||
132 | static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai, | |
133 | unsigned int fmt, int fsl_dir) | |
134 | { | |
135 | u32 val_cr2, val_cr3, val_cr4, reg_cr2, reg_cr3, reg_cr4; | |
136 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
137 | ||
138 | if (fsl_dir == FSL_FMT_TRANSMITTER) { | |
139 | reg_cr2 = FSL_SAI_TCR2; | |
140 | reg_cr3 = FSL_SAI_TCR3; | |
141 | reg_cr4 = FSL_SAI_TCR4; | |
142 | } else { | |
143 | reg_cr2 = FSL_SAI_RCR2; | |
144 | reg_cr3 = FSL_SAI_RCR3; | |
145 | reg_cr4 = FSL_SAI_RCR4; | |
146 | } | |
147 | ||
148 | val_cr2 = sai_readl(sai, sai->base + reg_cr2); | |
149 | val_cr3 = sai_readl(sai, sai->base + reg_cr3); | |
150 | val_cr4 = sai_readl(sai, sai->base + reg_cr4); | |
151 | ||
152 | if (sai->big_endian_data) | |
153 | val_cr4 |= FSL_SAI_CR4_MF; | |
154 | else | |
155 | val_cr4 &= ~FSL_SAI_CR4_MF; | |
156 | ||
157 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
158 | case SND_SOC_DAIFMT_I2S: | |
159 | val_cr4 |= FSL_SAI_CR4_FSE; | |
160 | val_cr4 |= FSL_SAI_CR4_FSP; | |
161 | break; | |
162 | default: | |
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
167 | case SND_SOC_DAIFMT_IB_IF: | |
168 | val_cr4 |= FSL_SAI_CR4_FSP; | |
169 | val_cr2 &= ~FSL_SAI_CR2_BCP; | |
170 | break; | |
171 | case SND_SOC_DAIFMT_IB_NF: | |
172 | val_cr4 &= ~FSL_SAI_CR4_FSP; | |
173 | val_cr2 &= ~FSL_SAI_CR2_BCP; | |
174 | break; | |
175 | case SND_SOC_DAIFMT_NB_IF: | |
176 | val_cr4 |= FSL_SAI_CR4_FSP; | |
177 | val_cr2 |= FSL_SAI_CR2_BCP; | |
178 | break; | |
179 | case SND_SOC_DAIFMT_NB_NF: | |
180 | val_cr4 &= ~FSL_SAI_CR4_FSP; | |
181 | val_cr2 |= FSL_SAI_CR2_BCP; | |
182 | break; | |
183 | default: | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
188 | case SND_SOC_DAIFMT_CBS_CFS: | |
189 | val_cr2 |= FSL_SAI_CR2_BCD_MSTR; | |
190 | val_cr4 |= FSL_SAI_CR4_FSD_MSTR; | |
191 | break; | |
192 | case SND_SOC_DAIFMT_CBM_CFM: | |
193 | val_cr2 &= ~FSL_SAI_CR2_BCD_MSTR; | |
194 | val_cr4 &= ~FSL_SAI_CR4_FSD_MSTR; | |
195 | break; | |
196 | default: | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | val_cr3 |= FSL_SAI_CR3_TRCE; | |
201 | ||
202 | if (fsl_dir == FSL_FMT_RECEIVER) | |
203 | val_cr2 |= FSL_SAI_CR2_SYNC; | |
204 | ||
205 | sai_writel(sai, val_cr2, sai->base + reg_cr2); | |
206 | sai_writel(sai, val_cr3, sai->base + reg_cr3); | |
207 | sai_writel(sai, val_cr4, sai->base + reg_cr4); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) | |
213 | { | |
214 | int ret; | |
215 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
216 | ||
217 | ret = clk_prepare_enable(sai->clk); | |
218 | if (ret) | |
219 | return ret; | |
220 | ||
221 | ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER); | |
222 | if (ret) { | |
223 | dev_err(cpu_dai->dev, | |
224 | "Cannot set SAI's transmitter format: %d\n", | |
225 | ret); | |
1fb2d9d7 | 226 | goto err_clk; |
43550821 XL |
227 | } |
228 | ||
229 | ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER); | |
230 | if (ret) { | |
231 | dev_err(cpu_dai->dev, | |
232 | "Cannot set SAI's receiver format: %d\n", | |
233 | ret); | |
1fb2d9d7 | 234 | goto err_clk; |
43550821 XL |
235 | } |
236 | ||
1fb2d9d7 | 237 | err_clk: |
43550821 XL |
238 | clk_disable_unprepare(sai->clk); |
239 | ||
1fb2d9d7 | 240 | return ret; |
43550821 XL |
241 | } |
242 | ||
243 | static int fsl_sai_hw_params(struct snd_pcm_substream *substream, | |
244 | struct snd_pcm_hw_params *params, | |
245 | struct snd_soc_dai *cpu_dai) | |
246 | { | |
247 | u32 val_cr4, val_cr5, val_mr, reg_cr4, reg_cr5, reg_mr, word_width; | |
248 | unsigned int channels = params_channels(params); | |
249 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
250 | ||
251 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
252 | reg_cr4 = FSL_SAI_TCR4; | |
253 | reg_cr5 = FSL_SAI_TCR5; | |
254 | reg_mr = FSL_SAI_TMR; | |
255 | } else { | |
256 | reg_cr4 = FSL_SAI_RCR4; | |
257 | reg_cr5 = FSL_SAI_RCR5; | |
258 | reg_mr = FSL_SAI_RMR; | |
259 | } | |
260 | ||
261 | val_cr4 = sai_readl(sai, sai->base + reg_cr4); | |
262 | val_cr4 &= ~FSL_SAI_CR4_SYWD_MASK; | |
263 | val_cr4 &= ~FSL_SAI_CR4_FRSZ_MASK; | |
264 | ||
265 | val_cr5 = sai_readl(sai, sai->base + reg_cr5); | |
266 | val_cr5 &= ~FSL_SAI_CR5_WNW_MASK; | |
267 | val_cr5 &= ~FSL_SAI_CR5_W0W_MASK; | |
268 | val_cr5 &= ~FSL_SAI_CR5_FBT_MASK; | |
269 | ||
270 | switch (params_format(params)) { | |
271 | case SNDRV_PCM_FORMAT_S16_LE: | |
272 | word_width = 16; | |
273 | break; | |
274 | case SNDRV_PCM_FORMAT_S20_3LE: | |
275 | word_width = 20; | |
276 | break; | |
277 | case SNDRV_PCM_FORMAT_S24_LE: | |
278 | word_width = 24; | |
279 | break; | |
280 | default: | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
284 | val_cr4 |= FSL_SAI_CR4_SYWD(word_width); | |
285 | val_cr5 |= FSL_SAI_CR5_WNW(word_width); | |
286 | val_cr5 |= FSL_SAI_CR5_W0W(word_width); | |
287 | ||
288 | if (sai->big_endian_data) | |
289 | val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1); | |
290 | else | |
291 | val_cr5 |= FSL_SAI_CR5_FBT(0); | |
292 | ||
293 | val_cr4 |= FSL_SAI_CR4_FRSZ(channels); | |
294 | if (channels == 2 || channels == 1) | |
295 | val_mr = ~0UL - ((1 << channels) - 1); | |
296 | else | |
297 | return -EINVAL; | |
298 | ||
299 | sai_writel(sai, val_cr4, sai->base + reg_cr4); | |
300 | sai_writel(sai, val_cr5, sai->base + reg_cr5); | |
301 | sai_writel(sai, val_mr, sai->base + reg_mr); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd, | |
307 | struct snd_soc_dai *cpu_dai) | |
308 | { | |
309 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
310 | unsigned int tcsr, rcsr; | |
311 | ||
312 | tcsr = sai_readl(sai, sai->base + FSL_SAI_TCSR); | |
313 | rcsr = sai_readl(sai, sai->base + FSL_SAI_RCSR); | |
314 | ||
315 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
316 | tcsr |= FSL_SAI_CSR_FRDE; | |
317 | rcsr &= ~FSL_SAI_CSR_FRDE; | |
318 | } else { | |
319 | rcsr |= FSL_SAI_CSR_FRDE; | |
320 | tcsr &= ~FSL_SAI_CSR_FRDE; | |
321 | } | |
322 | ||
323 | switch (cmd) { | |
324 | case SNDRV_PCM_TRIGGER_START: | |
325 | case SNDRV_PCM_TRIGGER_RESUME: | |
326 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
327 | tcsr |= FSL_SAI_CSR_TERE; | |
328 | rcsr |= FSL_SAI_CSR_TERE; | |
329 | sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR); | |
330 | sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR); | |
331 | break; | |
332 | ||
333 | case SNDRV_PCM_TRIGGER_STOP: | |
334 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
335 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
336 | if (!(cpu_dai->playback_active || cpu_dai->capture_active)) { | |
337 | tcsr &= ~FSL_SAI_CSR_TERE; | |
338 | rcsr &= ~FSL_SAI_CSR_TERE; | |
339 | } | |
340 | sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR); | |
341 | sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR); | |
342 | break; | |
343 | default: | |
344 | return -EINVAL; | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static int fsl_sai_startup(struct snd_pcm_substream *substream, | |
351 | struct snd_soc_dai *cpu_dai) | |
352 | { | |
353 | int ret; | |
354 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
355 | ||
356 | ret = clk_prepare_enable(sai->clk); | |
357 | ||
358 | return ret; | |
359 | } | |
360 | ||
361 | static void fsl_sai_shutdown(struct snd_pcm_substream *substream, | |
362 | struct snd_soc_dai *cpu_dai) | |
363 | { | |
364 | struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai); | |
365 | ||
366 | clk_disable_unprepare(sai->clk); | |
367 | } | |
368 | ||
369 | static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = { | |
370 | .set_sysclk = fsl_sai_set_dai_sysclk, | |
371 | .set_fmt = fsl_sai_set_dai_fmt, | |
372 | .hw_params = fsl_sai_hw_params, | |
373 | .trigger = fsl_sai_trigger, | |
374 | .startup = fsl_sai_startup, | |
375 | .shutdown = fsl_sai_shutdown, | |
376 | }; | |
377 | ||
378 | static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai) | |
379 | { | |
380 | struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev); | |
381 | ||
dd9f4060 XL |
382 | snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx, |
383 | &sai->dma_params_rx); | |
43550821 XL |
384 | |
385 | snd_soc_dai_set_drvdata(cpu_dai, sai); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
43550821 XL |
390 | static struct snd_soc_dai_driver fsl_sai_dai = { |
391 | .probe = fsl_sai_dai_probe, | |
43550821 XL |
392 | .playback = { |
393 | .channels_min = 1, | |
394 | .channels_max = 2, | |
395 | .rates = SNDRV_PCM_RATE_8000_96000, | |
396 | .formats = FSL_SAI_FORMATS, | |
397 | }, | |
398 | .capture = { | |
399 | .channels_min = 1, | |
400 | .channels_max = 2, | |
401 | .rates = SNDRV_PCM_RATE_8000_96000, | |
402 | .formats = FSL_SAI_FORMATS, | |
403 | }, | |
404 | .ops = &fsl_sai_pcm_dai_ops, | |
405 | }; | |
406 | ||
407 | static const struct snd_soc_component_driver fsl_component = { | |
408 | .name = "fsl-sai", | |
409 | }; | |
410 | ||
411 | static int fsl_sai_probe(struct platform_device *pdev) | |
412 | { | |
413 | int ret; | |
414 | struct fsl_sai *sai; | |
415 | struct resource *res; | |
416 | struct device_node *np = pdev->dev.of_node; | |
417 | ||
418 | sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); | |
419 | if (!sai) | |
420 | return -ENOMEM; | |
421 | ||
422 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
423 | sai->base = devm_ioremap_resource(&pdev->dev, res); | |
424 | if (IS_ERR(sai->base)) | |
425 | return PTR_ERR(sai->base); | |
426 | ||
427 | sai->clk = devm_clk_get(&pdev->dev, "sai"); | |
428 | if (IS_ERR(sai->clk)) { | |
429 | dev_err(&pdev->dev, "Cannot get SAI's clock\n"); | |
430 | return PTR_ERR(sai->clk); | |
431 | } | |
432 | ||
433 | sai->dma_params_rx.addr = res->start + FSL_SAI_RDR; | |
434 | sai->dma_params_tx.addr = res->start + FSL_SAI_TDR; | |
435 | sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX; | |
436 | sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX; | |
437 | ||
438 | sai->big_endian_regs = of_property_read_bool(np, "big-endian-regs"); | |
439 | sai->big_endian_data = of_property_read_bool(np, "big-endian-data"); | |
440 | ||
441 | platform_set_drvdata(pdev, sai); | |
442 | ||
443 | ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component, | |
444 | &fsl_sai_dai, 1); | |
445 | if (ret) | |
446 | return ret; | |
447 | ||
e5180df3 | 448 | return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, |
43550821 | 449 | SND_DMAENGINE_PCM_FLAG_NO_RESIDUE); |
43550821 XL |
450 | } |
451 | ||
452 | static const struct of_device_id fsl_sai_ids[] = { | |
453 | { .compatible = "fsl,vf610-sai", }, | |
454 | { /* sentinel */ } | |
455 | }; | |
456 | ||
457 | static struct platform_driver fsl_sai_driver = { | |
458 | .probe = fsl_sai_probe, | |
43550821 XL |
459 | .driver = { |
460 | .name = "fsl-sai", | |
461 | .owner = THIS_MODULE, | |
462 | .of_match_table = fsl_sai_ids, | |
463 | }, | |
464 | }; | |
465 | module_platform_driver(fsl_sai_driver); | |
466 | ||
467 | MODULE_DESCRIPTION("Freescale Soc SAI Interface"); | |
468 | MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>"); | |
469 | MODULE_ALIAS("platform:fsl-sai"); | |
470 | MODULE_LICENSE("GPL"); |