1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * pxa-ssp.c -- ALSA Soc Audio Layer
4 *
5 * Copyright 2005,2008 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood
7 * Mark Brown <broonie@opensource.wolfsonmicro.com>
8 *
9 * TODO:
10 * o Test network mode for > 16bit sample size
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/clk.h>
18 #include <linux/io.h>
19 #include <linux/pxa2xx_ssp.h>
20 #include <linux/of.h>
21 #include <linux/dmaengine.h>
22
23 #include <asm/irq.h>
24
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/initval.h>
28 #include <sound/pcm_params.h>
29 #include <sound/soc.h>
30 #include <sound/pxa2xx-lib.h>
31 #include <sound/dmaengine_pcm.h>
32
33 #include "pxa-ssp.h"
34
35 /*
36 * SSP audio private data
37 */
38 struct ssp_priv {
39 struct ssp_device *ssp;
40 struct clk *extclk;
41 unsigned long ssp_clk;
42 unsigned int sysclk;
43 unsigned int dai_fmt;
44 unsigned int configured_dai_fmt;
45 #ifdef CONFIG_PM
46 uint32_t cr0;
47 uint32_t cr1;
48 uint32_t to;
49 uint32_t psp;
50 #endif
51 };
52
dump_registers(struct ssp_device * ssp)53 static void dump_registers(struct ssp_device *ssp)
54 {
55 dev_dbg(ssp->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n",
56 pxa_ssp_read_reg(ssp, SSCR0), pxa_ssp_read_reg(ssp, SSCR1),
57 pxa_ssp_read_reg(ssp, SSTO));
58
59 dev_dbg(ssp->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n",
60 pxa_ssp_read_reg(ssp, SSPSP), pxa_ssp_read_reg(ssp, SSSR),
61 pxa_ssp_read_reg(ssp, SSACD));
62 }
63
pxa_ssp_set_dma_params(struct ssp_device * ssp,int width4,int out,struct snd_dmaengine_dai_dma_data * dma)64 static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4,
65 int out, struct snd_dmaengine_dai_dma_data *dma)
66 {
67 dma->addr_width = width4 ? DMA_SLAVE_BUSWIDTH_4_BYTES :
68 DMA_SLAVE_BUSWIDTH_2_BYTES;
69 dma->maxburst = 16;
70 dma->addr = ssp->phys_base + SSDR;
71 }
72
pxa_ssp_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)73 static int pxa_ssp_startup(struct snd_pcm_substream *substream,
74 struct snd_soc_dai *cpu_dai)
75 {
76 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
77 struct ssp_device *ssp = priv->ssp;
78 struct snd_dmaengine_dai_dma_data *dma;
79 int ret = 0;
80
81 if (!snd_soc_dai_active(cpu_dai)) {
82 clk_prepare_enable(ssp->clk);
83 pxa_ssp_disable(ssp);
84 }
85
86 clk_prepare_enable(priv->extclk);
87
88 dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL);
89 if (!dma)
90 return -ENOMEM;
91 dma->chan_name = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
92 "tx" : "rx";
93
94 snd_soc_dai_set_dma_data(cpu_dai, substream, dma);
95
96 return ret;
97 }
98
pxa_ssp_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * cpu_dai)99 static void pxa_ssp_shutdown(struct snd_pcm_substream *substream,
100 struct snd_soc_dai *cpu_dai)
101 {
102 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
103 struct ssp_device *ssp = priv->ssp;
104
105 if (!snd_soc_dai_active(cpu_dai)) {
106 pxa_ssp_disable(ssp);
107 clk_disable_unprepare(ssp->clk);
108 }
109
110 clk_disable_unprepare(priv->extclk);
111
112 kfree(snd_soc_dai_get_dma_data(cpu_dai, substream));
113 snd_soc_dai_set_dma_data(cpu_dai, substream, NULL);
114 }
115
116 #ifdef CONFIG_PM
117
pxa_ssp_suspend(struct snd_soc_component * component)118 static int pxa_ssp_suspend(struct snd_soc_component *component)
119 {
120 struct ssp_priv *priv = snd_soc_component_get_drvdata(component);
121 struct ssp_device *ssp = priv->ssp;
122
123 if (!snd_soc_component_active(component))
124 clk_prepare_enable(ssp->clk);
125
126 priv->cr0 = __raw_readl(ssp->mmio_base + SSCR0);
127 priv->cr1 = __raw_readl(ssp->mmio_base + SSCR1);
128 priv->to = __raw_readl(ssp->mmio_base + SSTO);
129 priv->psp = __raw_readl(ssp->mmio_base + SSPSP);
130
131 pxa_ssp_disable(ssp);
132 clk_disable_unprepare(ssp->clk);
133 return 0;
134 }
135
pxa_ssp_resume(struct snd_soc_component * component)136 static int pxa_ssp_resume(struct snd_soc_component *component)
137 {
138 struct ssp_priv *priv = snd_soc_component_get_drvdata(component);
139 struct ssp_device *ssp = priv->ssp;
140 uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE;
141
142 clk_prepare_enable(ssp->clk);
143
144 __raw_writel(sssr, ssp->mmio_base + SSSR);
145 __raw_writel(priv->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0);
146 __raw_writel(priv->cr1, ssp->mmio_base + SSCR1);
147 __raw_writel(priv->to, ssp->mmio_base + SSTO);
148 __raw_writel(priv->psp, ssp->mmio_base + SSPSP);
149
150 if (snd_soc_component_active(component))
151 pxa_ssp_enable(ssp);
152 else
153 clk_disable_unprepare(ssp->clk);
154
155 return 0;
156 }
157
158 #else
159 #define pxa_ssp_suspend NULL
160 #define pxa_ssp_resume NULL
161 #endif
162
163 /*
164 * ssp_set_clkdiv - set SSP clock divider
165 * @div: serial clock rate divider
166 */
pxa_ssp_set_scr(struct ssp_device * ssp,u32 div)167 static void pxa_ssp_set_scr(struct ssp_device *ssp, u32 div)
168 {
169 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
170
171 if (ssp->type == PXA25x_SSP) {
172 sscr0 &= ~0x0000ff00;
173 sscr0 |= ((div - 2)/2) << 8; /* 2..512 */
174 } else {
175 sscr0 &= ~0x000fff00;
176 sscr0 |= (div - 1) << 8; /* 1..4096 */
177 }
178 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
179 }
180
181 /*
182 * Set the SSP ports SYSCLK.
183 */
pxa_ssp_set_dai_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)184 static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
185 int clk_id, unsigned int freq, int dir)
186 {
187 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
188 struct ssp_device *ssp = priv->ssp;
189
190 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
191 ~(SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
192
193 if (priv->extclk) {
194 int ret;
195
196 /*
197 * For DT based boards, if an extclk is given, use it
198 * here and configure PXA_SSP_CLK_EXT.
199 */
200
201 ret = clk_set_rate(priv->extclk, freq);
202 if (ret < 0)
203 return ret;
204
205 clk_id = PXA_SSP_CLK_EXT;
206 }
207
208 dev_dbg(ssp->dev,
209 "pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n",
210 cpu_dai->id, clk_id, freq);
211
212 switch (clk_id) {
213 case PXA_SSP_CLK_NET_PLL:
214 sscr0 |= SSCR0_MOD;
215 break;
216 case PXA_SSP_CLK_PLL:
217 /* Internal PLL is fixed */
218 if (ssp->type == PXA25x_SSP)
219 priv->sysclk = 1843200;
220 else
221 priv->sysclk = 13000000;
222 break;
223 case PXA_SSP_CLK_EXT:
224 priv->sysclk = freq;
225 sscr0 |= SSCR0_ECS;
226 break;
227 case PXA_SSP_CLK_NET:
228 priv->sysclk = freq;
229 sscr0 |= SSCR0_NCS | SSCR0_MOD;
230 break;
231 case PXA_SSP_CLK_AUDIO:
232 priv->sysclk = 0;
233 pxa_ssp_set_scr(ssp, 1);
234 sscr0 |= SSCR0_ACS;
235 break;
236 default:
237 return -ENODEV;
238 }
239
240 /* The SSP clock must be disabled when changing SSP clock mode
241 * on PXA2xx. On PXA3xx it must be enabled when doing so. */
242 if (ssp->type != PXA3xx_SSP)
243 clk_disable_unprepare(ssp->clk);
244 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
245 if (ssp->type != PXA3xx_SSP)
246 clk_prepare_enable(ssp->clk);
247
248 return 0;
249 }
250
251 /*
252 * Configure the PLL frequency pxa27x and (afaik - pxa320 only)
253 */
pxa_ssp_set_pll(struct ssp_priv * priv,unsigned int freq)254 static int pxa_ssp_set_pll(struct ssp_priv *priv, unsigned int freq)
255 {
256 struct ssp_device *ssp = priv->ssp;
257 u32 ssacd = pxa_ssp_read_reg(ssp, SSACD) & ~0x70;
258
259 if (ssp->type == PXA3xx_SSP)
260 pxa_ssp_write_reg(ssp, SSACDD, 0);
261
262 switch (freq) {
263 case 5622000:
264 break;
265 case 11345000:
266 ssacd |= (0x1 << 4);
267 break;
268 case 12235000:
269 ssacd |= (0x2 << 4);
270 break;
271 case 14857000:
272 ssacd |= (0x3 << 4);
273 break;
274 case 32842000:
275 ssacd |= (0x4 << 4);
276 break;
277 case 48000000:
278 ssacd |= (0x5 << 4);
279 break;
280 case 0:
281 /* Disable */
282 break;
283
284 default:
285 /* PXA3xx has a clock ditherer which can be used to generate
286 * a wider range of frequencies - calculate a value for it.
287 */
288 if (ssp->type == PXA3xx_SSP) {
289 u32 val;
290 u64 tmp = 19968;
291
292 tmp *= 1000000;
293 do_div(tmp, freq);
294 val = tmp;
295
296 val = (val << 16) | 64;
297 pxa_ssp_write_reg(ssp, SSACDD, val);
298
299 ssacd |= (0x6 << 4);
300
301 dev_dbg(ssp->dev,
302 "Using SSACDD %x to supply %uHz\n",
303 val, freq);
304 break;
305 }
306
307 return -EINVAL;
308 }
309
310 pxa_ssp_write_reg(ssp, SSACD, ssacd);
311
312 return 0;
313 }
314
315 /*
316 * Set the active slots in TDM/Network mode
317 */
pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai * cpu_dai,unsigned int tx_mask,unsigned int rx_mask,int slots,int slot_width)318 static int pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
319 unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
320 {
321 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
322 struct ssp_device *ssp = priv->ssp;
323 u32 sscr0;
324
325 sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
326 sscr0 &= ~(SSCR0_MOD | SSCR0_SlotsPerFrm(8) | SSCR0_EDSS | SSCR0_DSS);
327
328 /* set slot width */
329 if (slot_width > 16)
330 sscr0 |= SSCR0_EDSS | SSCR0_DataSize(slot_width - 16);
331 else
332 sscr0 |= SSCR0_DataSize(slot_width);
333
334 if (slots > 1) {
335 /* enable network mode */
336 sscr0 |= SSCR0_MOD;
337
338 /* set number of active slots */
339 sscr0 |= SSCR0_SlotsPerFrm(slots);
340
341 /* set active slot mask */
342 pxa_ssp_write_reg(ssp, SSTSA, tx_mask);
343 pxa_ssp_write_reg(ssp, SSRSA, rx_mask);
344 }
345 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
346
347 return 0;
348 }
349
350 /*
351 * Tristate the SSP DAI lines
352 */
pxa_ssp_set_dai_tristate(struct snd_soc_dai * cpu_dai,int tristate)353 static int pxa_ssp_set_dai_tristate(struct snd_soc_dai *cpu_dai,
354 int tristate)
355 {
356 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
357 struct ssp_device *ssp = priv->ssp;
358 u32 sscr1;
359
360 sscr1 = pxa_ssp_read_reg(ssp, SSCR1);
361 if (tristate)
362 sscr1 &= ~SSCR1_TTE;
363 else
364 sscr1 |= SSCR1_TTE;
365 pxa_ssp_write_reg(ssp, SSCR1, sscr1);
366
367 return 0;
368 }
369
pxa_ssp_set_dai_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)370 static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
371 unsigned int fmt)
372 {
373 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
374
375 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
376 case SND_SOC_DAIFMT_BC_FC:
377 case SND_SOC_DAIFMT_BC_FP:
378 case SND_SOC_DAIFMT_BP_FP:
379 break;
380 default:
381 return -EINVAL;
382 }
383
384 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
385 case SND_SOC_DAIFMT_NB_NF:
386 case SND_SOC_DAIFMT_NB_IF:
387 case SND_SOC_DAIFMT_IB_IF:
388 case SND_SOC_DAIFMT_IB_NF:
389 break;
390 default:
391 return -EINVAL;
392 }
393
394 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
395 case SND_SOC_DAIFMT_I2S:
396 case SND_SOC_DAIFMT_DSP_A:
397 case SND_SOC_DAIFMT_DSP_B:
398 break;
399
400 default:
401 return -EINVAL;
402 }
403
404 /* Settings will be applied in hw_params() */
405 priv->dai_fmt = fmt;
406
407 return 0;
408 }
409
410 /*
411 * Set up the SSP DAI format.
412 * The SSP Port must be inactive before calling this function as the
413 * physical interface format is changed.
414 */
pxa_ssp_configure_dai_fmt(struct ssp_priv * priv)415 static int pxa_ssp_configure_dai_fmt(struct ssp_priv *priv)
416 {
417 struct ssp_device *ssp = priv->ssp;
418 u32 sscr0, sscr1, sspsp, scfr;
419
420 /* check if we need to change anything at all */
421 if (priv->configured_dai_fmt == priv->dai_fmt)
422 return 0;
423
424 /* reset port settings */
425 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) &
426 ~(SSCR0_PSP | SSCR0_MOD);
427 sscr1 = pxa_ssp_read_reg(ssp, SSCR1) &
428 ~(SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR |
429 SSCR1_RWOT | SSCR1_TRAIL | SSCR1_TFT | SSCR1_RFT);
430 sspsp = pxa_ssp_read_reg(ssp, SSPSP) &
431 ~(SSPSP_SFRMP | SSPSP_SCMODE(3));
432
433 sscr1 |= SSCR1_RxTresh(8) | SSCR1_TxTresh(7);
434
435 switch (priv->dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
436 case SND_SOC_DAIFMT_BC_FC:
437 sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR;
438 break;
439 case SND_SOC_DAIFMT_BC_FP:
440 sscr1 |= SSCR1_SCLKDIR | SSCR1_SCFR;
441 break;
442 case SND_SOC_DAIFMT_BP_FP:
443 break;
444 default:
445 return -EINVAL;
446 }
447
448 switch (priv->dai_fmt & SND_SOC_DAIFMT_INV_MASK) {
449 case SND_SOC_DAIFMT_NB_NF:
450 sspsp |= SSPSP_SFRMP;
451 break;
452 case SND_SOC_DAIFMT_NB_IF:
453 break;
454 case SND_SOC_DAIFMT_IB_IF:
455 sspsp |= SSPSP_SCMODE(2);
456 break;
457 case SND_SOC_DAIFMT_IB_NF:
458 sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP;
459 break;
460 default:
461 return -EINVAL;
462 }
463
464 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
465 case SND_SOC_DAIFMT_I2S:
466 sscr0 |= SSCR0_PSP;
467 sscr1 |= SSCR1_RWOT | SSCR1_TRAIL;
468 /* See hw_params() */
469 break;
470
471 case SND_SOC_DAIFMT_DSP_A:
472 sspsp |= SSPSP_FSRT;
473 fallthrough;
474 case SND_SOC_DAIFMT_DSP_B:
475 sscr0 |= SSCR0_MOD | SSCR0_PSP;
476 sscr1 |= SSCR1_TRAIL | SSCR1_RWOT;
477 break;
478
479 default:
480 return -EINVAL;
481 }
482
483 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
484 pxa_ssp_write_reg(ssp, SSCR1, sscr1);
485 pxa_ssp_write_reg(ssp, SSPSP, sspsp);
486
487 switch (priv->dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
488 case SND_SOC_DAIFMT_BC_FC:
489 case SND_SOC_DAIFMT_BC_FP:
490 scfr = pxa_ssp_read_reg(ssp, SSCR1) | SSCR1_SCFR;
491 pxa_ssp_write_reg(ssp, SSCR1, scfr);
492
493 while (pxa_ssp_read_reg(ssp, SSSR) & SSSR_BSY)
494 cpu_relax();
495 break;
496 }
497
498 dump_registers(ssp);
499
500 /* Since we are configuring the timings for the format by hand
501 * we have to defer some things until hw_params() where we
502 * know parameters like the sample size.
503 */
504 priv->configured_dai_fmt = priv->dai_fmt;
505
506 return 0;
507 }
508
509 struct pxa_ssp_clock_mode {
510 int rate;
511 int pll;
512 u8 acds;
513 u8 scdb;
514 };
515
516 static const struct pxa_ssp_clock_mode pxa_ssp_clock_modes[] = {
517 { .rate = 8000, .pll = 32842000, .acds = SSACD_ACDS_32, .scdb = SSACD_SCDB_4X },
518 { .rate = 11025, .pll = 5622000, .acds = SSACD_ACDS_4, .scdb = SSACD_SCDB_4X },
519 { .rate = 16000, .pll = 32842000, .acds = SSACD_ACDS_16, .scdb = SSACD_SCDB_4X },
520 { .rate = 22050, .pll = 5622000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X },
521 { .rate = 44100, .pll = 11345000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X },
522 { .rate = 48000, .pll = 12235000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X },
523 { .rate = 96000, .pll = 12235000, .acds = SSACD_ACDS_4, .scdb = SSACD_SCDB_1X },
524 {}
525 };
526
527 /*
528 * Set the SSP audio DMA parameters and sample size.
529 * Can be called multiple times by oss emulation.
530 */
pxa_ssp_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)531 static int pxa_ssp_hw_params(struct snd_pcm_substream *substream,
532 struct snd_pcm_hw_params *params,
533 struct snd_soc_dai *cpu_dai)
534 {
535 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
536 struct ssp_device *ssp = priv->ssp;
537 int chn = params_channels(params);
538 u32 sscr0, sspsp;
539 int width = snd_pcm_format_physical_width(params_format(params));
540 int ttsa = pxa_ssp_read_reg(ssp, SSTSA) & 0xf;
541 struct snd_dmaengine_dai_dma_data *dma_data;
542 int rate = params_rate(params);
543 int bclk = rate * chn * (width / 8);
544 int ret;
545
546 dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
547
548 /* Network mode with one active slot (ttsa == 1) can be used
549 * to force 16-bit frame width on the wire (for S16_LE), even
550 * with two channels. Use 16-bit DMA transfers for this case.
551 */
552 pxa_ssp_set_dma_params(ssp,
553 ((chn == 2) && (ttsa != 1)) || (width == 32),
554 substream->stream == SNDRV_PCM_STREAM_PLAYBACK, dma_data);
555
556 /* we can only change the settings if the port is not in use */
557 if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE)
558 return 0;
559
560 ret = pxa_ssp_configure_dai_fmt(priv);
561 if (ret < 0)
562 return ret;
563
564 /* clear selected SSP bits */
565 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS);
566
567 /* bit size */
568 switch (params_format(params)) {
569 case SNDRV_PCM_FORMAT_S16_LE:
570 if (ssp->type == PXA3xx_SSP)
571 sscr0 |= SSCR0_FPCKE;
572 sscr0 |= SSCR0_DataSize(16);
573 break;
574 case SNDRV_PCM_FORMAT_S24_LE:
575 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(8));
576 break;
577 case SNDRV_PCM_FORMAT_S32_LE:
578 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(16));
579 break;
580 }
581 pxa_ssp_write_reg(ssp, SSCR0, sscr0);
582
583 if (sscr0 & SSCR0_ACS) {
584 ret = pxa_ssp_set_pll(priv, bclk);
585
586 /*
587 * If we were able to generate the bclk directly,
588 * all is fine. Otherwise, look up the closest rate
589 * from the table and also set the dividers.
590 */
591
592 if (ret < 0) {
593 const struct pxa_ssp_clock_mode *m;
594 int ssacd;
595
596 for (m = pxa_ssp_clock_modes; m->rate; m++) {
597 if (m->rate == rate)
598 break;
599 }
600
601 if (!m->rate)
602 return -EINVAL;
603
604 ret = pxa_ssp_set_pll(priv, bclk);
605 if (ret < 0)
606 return ret;
607
608 ssacd = pxa_ssp_read_reg(ssp, SSACD);
609 ssacd &= ~(SSACD_ACDS(7) | SSACD_SCDB_1X);
610 ssacd |= SSACD_ACDS(m->acds);
611 ssacd |= m->scdb;
612 pxa_ssp_write_reg(ssp, SSACD, ssacd);
613 }
614 } else if (sscr0 & SSCR0_ECS) {
615 /*
616 * For setups with external clocking, the PLL and its diviers
617 * are not active. Instead, the SCR bits in SSCR0 can be used
618 * to divide the clock.
619 */
620 pxa_ssp_set_scr(ssp, bclk / rate);
621 }
622
623 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
624 case SND_SOC_DAIFMT_I2S:
625 sspsp = pxa_ssp_read_reg(ssp, SSPSP);
626
627 if (((priv->sysclk / bclk) == 64) && (width == 16)) {
628 /* This is a special case where the bitclk is 64fs
629 * and we're not dealing with 2*32 bits of audio
630 * samples.
631 *
632 * The SSP values used for that are all found out by
633 * trying and failing a lot; some of the registers
634 * needed for that mode are only available on PXA3xx.
635 */
636 if (ssp->type != PXA3xx_SSP)
637 return -EINVAL;
638
639 sspsp |= SSPSP_SFRMWDTH(width * 2);
640 sspsp |= SSPSP_SFRMDLY(width * 4);
641 sspsp |= SSPSP_EDMYSTOP(3);
642 sspsp |= SSPSP_DMYSTOP(3);
643 sspsp |= SSPSP_DMYSTRT(1);
644 } else {
645 /* The frame width is the width the LRCLK is
646 * asserted for; the delay is expressed in
647 * half cycle units. We need the extra cycle
648 * because the data starts clocking out one BCLK
649 * after LRCLK changes polarity.
650 */
651 sspsp |= SSPSP_SFRMWDTH(width + 1);
652 sspsp |= SSPSP_SFRMDLY((width + 1) * 2);
653 sspsp |= SSPSP_DMYSTRT(1);
654 }
655
656 pxa_ssp_write_reg(ssp, SSPSP, sspsp);
657 break;
658 default:
659 break;
660 }
661
662 /* When we use a network mode, we always require TDM slots
663 * - complain loudly and fail if they've not been set up yet.
664 */
665 if ((sscr0 & SSCR0_MOD) && !ttsa) {
666 dev_err(ssp->dev, "No TDM timeslot configured\n");
667 return -EINVAL;
668 }
669
670 dump_registers(ssp);
671
672 return 0;
673 }
674
pxa_ssp_set_running_bit(struct snd_pcm_substream * substream,struct ssp_device * ssp,int value)675 static void pxa_ssp_set_running_bit(struct snd_pcm_substream *substream,
676 struct ssp_device *ssp, int value)
677 {
678 uint32_t sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
679 uint32_t sscr1 = pxa_ssp_read_reg(ssp, SSCR1);
680 uint32_t sspsp = pxa_ssp_read_reg(ssp, SSPSP);
681 uint32_t sssr = pxa_ssp_read_reg(ssp, SSSR);
682
683 if (value && (sscr0 & SSCR0_SSE))
684 pxa_ssp_write_reg(ssp, SSCR0, sscr0 & ~SSCR0_SSE);
685
686 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
687 if (value)
688 sscr1 |= SSCR1_TSRE;
689 else
690 sscr1 &= ~SSCR1_TSRE;
691 } else {
692 if (value)
693 sscr1 |= SSCR1_RSRE;
694 else
695 sscr1 &= ~SSCR1_RSRE;
696 }
697
698 pxa_ssp_write_reg(ssp, SSCR1, sscr1);
699
700 if (value) {
701 pxa_ssp_write_reg(ssp, SSSR, sssr);
702 pxa_ssp_write_reg(ssp, SSPSP, sspsp);
703 pxa_ssp_write_reg(ssp, SSCR0, sscr0 | SSCR0_SSE);
704 }
705 }
706
pxa_ssp_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * cpu_dai)707 static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
708 struct snd_soc_dai *cpu_dai)
709 {
710 int ret = 0;
711 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
712 struct ssp_device *ssp = priv->ssp;
713 int val;
714
715 switch (cmd) {
716 case SNDRV_PCM_TRIGGER_RESUME:
717 pxa_ssp_enable(ssp);
718 break;
719 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
720 pxa_ssp_set_running_bit(substream, ssp, 1);
721 val = pxa_ssp_read_reg(ssp, SSSR);
722 pxa_ssp_write_reg(ssp, SSSR, val);
723 break;
724 case SNDRV_PCM_TRIGGER_START:
725 pxa_ssp_set_running_bit(substream, ssp, 1);
726 break;
727 case SNDRV_PCM_TRIGGER_STOP:
728 pxa_ssp_set_running_bit(substream, ssp, 0);
729 break;
730 case SNDRV_PCM_TRIGGER_SUSPEND:
731 pxa_ssp_disable(ssp);
732 break;
733 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
734 pxa_ssp_set_running_bit(substream, ssp, 0);
735 break;
736
737 default:
738 ret = -EINVAL;
739 }
740
741 dump_registers(ssp);
742
743 return ret;
744 }
745
pxa_ssp_probe(struct snd_soc_dai * dai)746 static int pxa_ssp_probe(struct snd_soc_dai *dai)
747 {
748 struct device *dev = dai->dev;
749 struct ssp_priv *priv;
750 int ret;
751
752 priv = kzalloc(sizeof(struct ssp_priv), GFP_KERNEL);
753 if (!priv)
754 return -ENOMEM;
755
756 if (dev->of_node) {
757 struct device_node *ssp_handle;
758
759 ssp_handle = of_parse_phandle(dev->of_node, "port", 0);
760 if (!ssp_handle) {
761 dev_err(dev, "unable to get 'port' phandle\n");
762 ret = -ENODEV;
763 goto err_priv;
764 }
765
766 priv->ssp = pxa_ssp_request_of(ssp_handle, "SoC audio");
767 if (priv->ssp == NULL) {
768 ret = -ENODEV;
769 goto err_priv;
770 }
771
772 priv->extclk = devm_clk_get(dev, "extclk");
773 if (IS_ERR(priv->extclk)) {
774 ret = PTR_ERR(priv->extclk);
775 if (ret == -EPROBE_DEFER)
776 goto err_priv;
777
778 priv->extclk = NULL;
779 }
780 } else {
781 priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio");
782 if (priv->ssp == NULL) {
783 ret = -ENODEV;
784 goto err_priv;
785 }
786 }
787
788 priv->dai_fmt = (unsigned int) -1;
789 snd_soc_dai_set_drvdata(dai, priv);
790
791 return 0;
792
793 err_priv:
794 kfree(priv);
795 return ret;
796 }
797
pxa_ssp_remove(struct snd_soc_dai * dai)798 static int pxa_ssp_remove(struct snd_soc_dai *dai)
799 {
800 struct ssp_priv *priv = snd_soc_dai_get_drvdata(dai);
801
802 pxa_ssp_free(priv->ssp);
803 kfree(priv);
804 return 0;
805 }
806
807 #define PXA_SSP_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
808 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
809 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
810 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
811 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
812
813 #define PXA_SSP_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
814
815 static const struct snd_soc_dai_ops pxa_ssp_dai_ops = {
816 .probe = pxa_ssp_probe,
817 .remove = pxa_ssp_remove,
818 .startup = pxa_ssp_startup,
819 .shutdown = pxa_ssp_shutdown,
820 .trigger = pxa_ssp_trigger,
821 .hw_params = pxa_ssp_hw_params,
822 .set_sysclk = pxa_ssp_set_dai_sysclk,
823 .set_fmt = pxa_ssp_set_dai_fmt,
824 .set_tdm_slot = pxa_ssp_set_dai_tdm_slot,
825 .set_tristate = pxa_ssp_set_dai_tristate,
826 };
827
828 static struct snd_soc_dai_driver pxa_ssp_dai = {
829 .playback = {
830 .channels_min = 1,
831 .channels_max = 8,
832 .rates = PXA_SSP_RATES,
833 .formats = PXA_SSP_FORMATS,
834 },
835 .capture = {
836 .channels_min = 1,
837 .channels_max = 8,
838 .rates = PXA_SSP_RATES,
839 .formats = PXA_SSP_FORMATS,
840 },
841 .ops = &pxa_ssp_dai_ops,
842 };
843
844 static const struct snd_soc_component_driver pxa_ssp_component = {
845 .name = "pxa-ssp",
846 .pcm_construct = pxa2xx_soc_pcm_new,
847 .open = pxa2xx_soc_pcm_open,
848 .close = pxa2xx_soc_pcm_close,
849 .hw_params = pxa2xx_soc_pcm_hw_params,
850 .prepare = pxa2xx_soc_pcm_prepare,
851 .trigger = pxa2xx_soc_pcm_trigger,
852 .pointer = pxa2xx_soc_pcm_pointer,
853 .suspend = pxa_ssp_suspend,
854 .resume = pxa_ssp_resume,
855 .legacy_dai_naming = 1,
856 };
857
858 #ifdef CONFIG_OF
859 static const struct of_device_id pxa_ssp_of_ids[] = {
860 { .compatible = "mrvl,pxa-ssp-dai" },
861 {}
862 };
863 MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
864 #endif
865
asoc_ssp_probe(struct platform_device * pdev)866 static int asoc_ssp_probe(struct platform_device *pdev)
867 {
868 return devm_snd_soc_register_component(&pdev->dev, &pxa_ssp_component,
869 &pxa_ssp_dai, 1);
870 }
871
872 static struct platform_driver asoc_ssp_driver = {
873 .driver = {
874 .name = "pxa-ssp-dai",
875 .of_match_table = of_match_ptr(pxa_ssp_of_ids),
876 },
877
878 .probe = asoc_ssp_probe,
879 };
880
881 module_platform_driver(asoc_ssp_driver);
882
883 /* Module information */
884 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
885 MODULE_DESCRIPTION("PXA SSP/PCM SoC Interface");
886 MODULE_LICENSE("GPL");
887 MODULE_ALIAS("platform:pxa-ssp-dai");
888