xref: /openbmc/linux/sound/soc/pxa/mmp-sspa.c (revision aa5b395b) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * linux/sound/soc/pxa/mmp-sspa.c
4  * Base on pxa2xx-ssp.c
5  *
6  * Copyright (C) 2011 Marvell International Ltd.
7  */
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/delay.h>
12 #include <linux/clk.h>
13 #include <linux/slab.h>
14 #include <linux/pxa2xx_ssp.h>
15 #include <linux/io.h>
16 #include <linux/dmaengine.h>
17 
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/initval.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
23 #include <sound/pxa2xx-lib.h>
24 #include <sound/dmaengine_pcm.h>
25 #include "mmp-sspa.h"
26 
27 /*
28  * SSPA audio private data
29  */
30 struct sspa_priv {
31 	struct ssp_device *sspa;
32 	struct snd_dmaengine_dai_dma_data *dma_params;
33 	struct clk *audio_clk;
34 	struct clk *sysclk;
35 	int dai_fmt;
36 	int running_cnt;
37 };
38 
39 static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
40 {
41 	__raw_writel(val, sspa->mmio_base + reg);
42 }
43 
44 static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
45 {
46 	return __raw_readl(sspa->mmio_base + reg);
47 }
48 
49 static void mmp_sspa_tx_enable(struct ssp_device *sspa)
50 {
51 	unsigned int sspa_sp;
52 
53 	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
54 	sspa_sp |= SSPA_SP_S_EN;
55 	sspa_sp |= SSPA_SP_WEN;
56 	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
57 }
58 
59 static void mmp_sspa_tx_disable(struct ssp_device *sspa)
60 {
61 	unsigned int sspa_sp;
62 
63 	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
64 	sspa_sp &= ~SSPA_SP_S_EN;
65 	sspa_sp |= SSPA_SP_WEN;
66 	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
67 }
68 
69 static void mmp_sspa_rx_enable(struct ssp_device *sspa)
70 {
71 	unsigned int sspa_sp;
72 
73 	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
74 	sspa_sp |= SSPA_SP_S_EN;
75 	sspa_sp |= SSPA_SP_WEN;
76 	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
77 }
78 
79 static void mmp_sspa_rx_disable(struct ssp_device *sspa)
80 {
81 	unsigned int sspa_sp;
82 
83 	sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
84 	sspa_sp &= ~SSPA_SP_S_EN;
85 	sspa_sp |= SSPA_SP_WEN;
86 	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
87 }
88 
89 static int mmp_sspa_startup(struct snd_pcm_substream *substream,
90 	struct snd_soc_dai *dai)
91 {
92 	struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
93 
94 	clk_enable(priv->sysclk);
95 	clk_enable(priv->sspa->clk);
96 
97 	return 0;
98 }
99 
100 static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
101 	struct snd_soc_dai *dai)
102 {
103 	struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
104 
105 	clk_disable(priv->sspa->clk);
106 	clk_disable(priv->sysclk);
107 
108 }
109 
110 /*
111  * Set the SSP ports SYSCLK.
112  */
113 static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
114 				    int clk_id, unsigned int freq, int dir)
115 {
116 	struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
117 	int ret = 0;
118 
119 	switch (clk_id) {
120 	case MMP_SSPA_CLK_AUDIO:
121 		ret = clk_set_rate(priv->audio_clk, freq);
122 		if (ret)
123 			return ret;
124 		break;
125 	case MMP_SSPA_CLK_PLL:
126 	case MMP_SSPA_CLK_VCXO:
127 		/* not support yet */
128 		return -EINVAL;
129 	default:
130 		return -EINVAL;
131 	}
132 
133 	return 0;
134 }
135 
136 static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
137 				 int source, unsigned int freq_in,
138 				 unsigned int freq_out)
139 {
140 	struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
141 	int ret = 0;
142 
143 	switch (pll_id) {
144 	case MMP_SYSCLK:
145 		ret = clk_set_rate(priv->sysclk, freq_out);
146 		if (ret)
147 			return ret;
148 		break;
149 	case MMP_SSPA_CLK:
150 		ret = clk_set_rate(priv->sspa->clk, freq_out);
151 		if (ret)
152 			return ret;
153 		break;
154 	default:
155 		return -ENODEV;
156 	}
157 
158 	return 0;
159 }
160 
161 /*
162  * Set up the sspa dai format. The sspa port must be inactive
163  * before calling this function as the physical
164  * interface format is changed.
165  */
166 static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
167 				 unsigned int fmt)
168 {
169 	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai);
170 	struct ssp_device *sspa = sspa_priv->sspa;
171 	u32 sspa_sp, sspa_ctrl;
172 
173 	/* check if we need to change anything at all */
174 	if (sspa_priv->dai_fmt == fmt)
175 		return 0;
176 
177 	/* we can only change the settings if the port is not in use */
178 	if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) ||
179 	    (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) {
180 		dev_err(sspa->dev,
181 			"can't change hardware dai format: stream is in use\n");
182 		return -EINVAL;
183 	}
184 
185 	/* reset port settings */
186 	sspa_sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
187 	sspa_ctrl = 0;
188 
189 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
190 	case SND_SOC_DAIFMT_CBS_CFS:
191 		sspa_sp |= SSPA_SP_MSL;
192 		break;
193 	case SND_SOC_DAIFMT_CBM_CFM:
194 		break;
195 	default:
196 		return -EINVAL;
197 	}
198 
199 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
200 	case SND_SOC_DAIFMT_NB_NF:
201 		sspa_sp |= SSPA_SP_FSP;
202 		break;
203 	default:
204 		return -EINVAL;
205 	}
206 
207 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
208 	case SND_SOC_DAIFMT_I2S:
209 		sspa_sp |= SSPA_TXSP_FPER(63);
210 		sspa_sp |= SSPA_SP_FWID(31);
211 		sspa_ctrl |= SSPA_CTL_XDATDLY(1);
212 		break;
213 	default:
214 		return -EINVAL;
215 	}
216 
217 	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
218 	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
219 
220 	sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
221 	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
222 	mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
223 
224 	/*
225 	 * FIXME: hw issue, for the tx serial port,
226 	 * can not config the master/slave mode;
227 	 * so must clean this bit.
228 	 * The master/slave mode has been set in the
229 	 * rx port.
230 	 */
231 	sspa_sp &= ~SSPA_SP_MSL;
232 	mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
233 
234 	mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
235 	mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
236 
237 	/* Since we are configuring the timings for the format by hand
238 	 * we have to defer some things until hw_params() where we
239 	 * know parameters like the sample size.
240 	 */
241 	sspa_priv->dai_fmt = fmt;
242 	return 0;
243 }
244 
245 /*
246  * Set the SSPA audio DMA parameters and sample size.
247  * Can be called multiple times by oss emulation.
248  */
249 static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
250 			       struct snd_pcm_hw_params *params,
251 			       struct snd_soc_dai *dai)
252 {
253 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
254 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
255 	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
256 	struct ssp_device *sspa = sspa_priv->sspa;
257 	struct snd_dmaengine_dai_dma_data *dma_params;
258 	u32 sspa_ctrl;
259 
260 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
261 		sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL);
262 	else
263 		sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL);
264 
265 	sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK;
266 	sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1);
267 	sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
268 	sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS);
269 	sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
270 
271 	switch (params_format(params)) {
272 	case SNDRV_PCM_FORMAT_S8:
273 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS);
274 		break;
275 	case SNDRV_PCM_FORMAT_S16_LE:
276 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
277 		break;
278 	case SNDRV_PCM_FORMAT_S20_3LE:
279 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
280 		break;
281 	case SNDRV_PCM_FORMAT_S24_3LE:
282 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
283 		break;
284 	case SNDRV_PCM_FORMAT_S32_LE:
285 		sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS);
286 		break;
287 	default:
288 		return -EINVAL;
289 	}
290 
291 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
292 		mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
293 		mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1);
294 	} else {
295 		mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
296 		mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0);
297 	}
298 
299 	dma_params = &sspa_priv->dma_params[substream->stream];
300 	dma_params->addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
301 				(sspa->phys_base + SSPA_TXD) :
302 				(sspa->phys_base + SSPA_RXD);
303 	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params);
304 	return 0;
305 }
306 
307 static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
308 			     struct snd_soc_dai *dai)
309 {
310 	struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
311 	struct ssp_device *sspa = sspa_priv->sspa;
312 	int ret = 0;
313 
314 	switch (cmd) {
315 	case SNDRV_PCM_TRIGGER_START:
316 	case SNDRV_PCM_TRIGGER_RESUME:
317 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
318 		/*
319 		 * whatever playback or capture, must enable rx.
320 		 * this is a hw issue, so need check if rx has been
321 		 * enabled or not; if has been enabled by another
322 		 * stream, do not enable again.
323 		 */
324 		if (!sspa_priv->running_cnt)
325 			mmp_sspa_rx_enable(sspa);
326 
327 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
328 			mmp_sspa_tx_enable(sspa);
329 
330 		sspa_priv->running_cnt++;
331 		break;
332 
333 	case SNDRV_PCM_TRIGGER_STOP:
334 	case SNDRV_PCM_TRIGGER_SUSPEND:
335 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
336 		sspa_priv->running_cnt--;
337 
338 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
339 			mmp_sspa_tx_disable(sspa);
340 
341 		/* have no capture stream, disable rx port */
342 		if (!sspa_priv->running_cnt)
343 			mmp_sspa_rx_disable(sspa);
344 		break;
345 
346 	default:
347 		ret = -EINVAL;
348 	}
349 
350 	return ret;
351 }
352 
353 static int mmp_sspa_probe(struct snd_soc_dai *dai)
354 {
355 	struct sspa_priv *priv = dev_get_drvdata(dai->dev);
356 
357 	snd_soc_dai_set_drvdata(dai, priv);
358 	return 0;
359 
360 }
361 
362 #define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
363 #define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
364 		SNDRV_PCM_FMTBIT_S16_LE | \
365 		SNDRV_PCM_FMTBIT_S24_LE | \
366 		SNDRV_PCM_FMTBIT_S32_LE)
367 
368 static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
369 	.startup	= mmp_sspa_startup,
370 	.shutdown	= mmp_sspa_shutdown,
371 	.trigger	= mmp_sspa_trigger,
372 	.hw_params	= mmp_sspa_hw_params,
373 	.set_sysclk	= mmp_sspa_set_dai_sysclk,
374 	.set_pll	= mmp_sspa_set_dai_pll,
375 	.set_fmt	= mmp_sspa_set_dai_fmt,
376 };
377 
378 static struct snd_soc_dai_driver mmp_sspa_dai = {
379 	.probe = mmp_sspa_probe,
380 	.playback = {
381 		.channels_min = 1,
382 		.channels_max = 128,
383 		.rates = MMP_SSPA_RATES,
384 		.formats = MMP_SSPA_FORMATS,
385 	},
386 	.capture = {
387 		.channels_min = 1,
388 		.channels_max = 2,
389 		.rates = MMP_SSPA_RATES,
390 		.formats = MMP_SSPA_FORMATS,
391 	},
392 	.ops = &mmp_sspa_dai_ops,
393 };
394 
395 static const struct snd_soc_component_driver mmp_sspa_component = {
396 	.name		= "mmp-sspa",
397 };
398 
399 static int asoc_mmp_sspa_probe(struct platform_device *pdev)
400 {
401 	struct sspa_priv *priv;
402 
403 	priv = devm_kzalloc(&pdev->dev,
404 				sizeof(struct sspa_priv), GFP_KERNEL);
405 	if (!priv)
406 		return -ENOMEM;
407 
408 	priv->sspa = devm_kzalloc(&pdev->dev,
409 				sizeof(struct ssp_device), GFP_KERNEL);
410 	if (priv->sspa == NULL)
411 		return -ENOMEM;
412 
413 	priv->dma_params = devm_kcalloc(&pdev->dev,
414 			2, sizeof(struct snd_dmaengine_dai_dma_data),
415 			GFP_KERNEL);
416 	if (priv->dma_params == NULL)
417 		return -ENOMEM;
418 
419 	priv->sspa->mmio_base = devm_platform_ioremap_resource(pdev, 0);
420 	if (IS_ERR(priv->sspa->mmio_base))
421 		return PTR_ERR(priv->sspa->mmio_base);
422 
423 	priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
424 	if (IS_ERR(priv->sspa->clk))
425 		return PTR_ERR(priv->sspa->clk);
426 
427 	priv->audio_clk = clk_get(NULL, "mmp-audio");
428 	if (IS_ERR(priv->audio_clk))
429 		return PTR_ERR(priv->audio_clk);
430 
431 	priv->sysclk = clk_get(NULL, "mmp-sysclk");
432 	if (IS_ERR(priv->sysclk)) {
433 		clk_put(priv->audio_clk);
434 		return PTR_ERR(priv->sysclk);
435 	}
436 	clk_enable(priv->audio_clk);
437 	priv->dai_fmt = (unsigned int) -1;
438 	platform_set_drvdata(pdev, priv);
439 
440 	return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
441 					       &mmp_sspa_dai, 1);
442 }
443 
444 static int asoc_mmp_sspa_remove(struct platform_device *pdev)
445 {
446 	struct sspa_priv *priv = platform_get_drvdata(pdev);
447 
448 	clk_disable(priv->audio_clk);
449 	clk_put(priv->audio_clk);
450 	clk_put(priv->sysclk);
451 	return 0;
452 }
453 
454 static struct platform_driver asoc_mmp_sspa_driver = {
455 	.driver = {
456 		.name = "mmp-sspa-dai",
457 	},
458 	.probe = asoc_mmp_sspa_probe,
459 	.remove = asoc_mmp_sspa_remove,
460 };
461 
462 module_platform_driver(asoc_mmp_sspa_driver);
463 
464 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
465 MODULE_DESCRIPTION("MMP SSPA SoC Interface");
466 MODULE_LICENSE("GPL");
467 MODULE_ALIAS("platform:mmp-sspa-dai");
468