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/io.h>
15#include <linux/dmaengine.h>
16#include <linux/pm_runtime.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 */
30struct sspa_priv {
31	void __iomem *tx_base;
32	void __iomem *rx_base;
33
34	struct snd_dmaengine_dai_dma_data playback_dma_data;
35	struct snd_dmaengine_dai_dma_data capture_dma_data;
36	struct clk *clk;
37	struct clk *audio_clk;
38	struct clk *sysclk;
39
40	int running_cnt;
41	u32 sp;
42	u32 ctrl;
43};
44
45static void mmp_sspa_tx_enable(struct sspa_priv *sspa)
46{
47	unsigned int sspa_sp = sspa->sp;
48
49	sspa_sp &= ~SSPA_SP_MSL;
50	sspa_sp |= SSPA_SP_S_EN;
51	sspa_sp |= SSPA_SP_WEN;
52	__raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
53}
54
55static void mmp_sspa_tx_disable(struct sspa_priv *sspa)
56{
57	unsigned int sspa_sp = sspa->sp;
58
59	sspa_sp &= ~SSPA_SP_MSL;
60	sspa_sp &= ~SSPA_SP_S_EN;
61	sspa_sp |= SSPA_SP_WEN;
62	__raw_writel(sspa_sp, sspa->tx_base + SSPA_SP);
63}
64
65static void mmp_sspa_rx_enable(struct sspa_priv *sspa)
66{
67	unsigned int sspa_sp = sspa->sp;
68
69	sspa_sp |= SSPA_SP_S_EN;
70	sspa_sp |= SSPA_SP_WEN;
71	__raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
72}
73
74static void mmp_sspa_rx_disable(struct sspa_priv *sspa)
75{
76	unsigned int sspa_sp = sspa->sp;
77
78	sspa_sp &= ~SSPA_SP_S_EN;
79	sspa_sp |= SSPA_SP_WEN;
80	__raw_writel(sspa_sp, sspa->rx_base + SSPA_SP);
81}
82
83static int mmp_sspa_startup(struct snd_pcm_substream *substream,
84	struct snd_soc_dai *dai)
85{
86	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
87
88	clk_prepare_enable(sspa->sysclk);
89	clk_prepare_enable(sspa->clk);
90
91	return 0;
92}
93
94static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
95	struct snd_soc_dai *dai)
96{
97	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
98
99	clk_disable_unprepare(sspa->clk);
100	clk_disable_unprepare(sspa->sysclk);
101}
102
103/*
104 * Set the SSP ports SYSCLK.
105 */
106static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
107				    int clk_id, unsigned int freq, int dir)
108{
109	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
110	struct device *dev = cpu_dai->component->dev;
111	int ret = 0;
112
113	if (dev->of_node)
114		return -ENOTSUPP;
115
116	switch (clk_id) {
117	case MMP_SSPA_CLK_AUDIO:
118		ret = clk_set_rate(sspa->audio_clk, freq);
119		if (ret)
120			return ret;
121		break;
122	case MMP_SSPA_CLK_PLL:
123	case MMP_SSPA_CLK_VCXO:
124		/* not support yet */
125		return -EINVAL;
126	default:
127		return -EINVAL;
128	}
129
130	return 0;
131}
132
133static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
134				 int source, unsigned int freq_in,
135				 unsigned int freq_out)
136{
137	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
138	struct device *dev = cpu_dai->component->dev;
139	int ret = 0;
140
141	if (dev->of_node)
142		return -ENOTSUPP;
143
144	switch (pll_id) {
145	case MMP_SYSCLK:
146		ret = clk_set_rate(sspa->sysclk, freq_out);
147		if (ret)
148			return ret;
149		break;
150	case MMP_SSPA_CLK:
151		ret = clk_set_rate(sspa->clk, freq_out);
152		if (ret)
153			return ret;
154		break;
155	default:
156		return -ENODEV;
157	}
158
159	return 0;
160}
161
162/*
163 * Set up the sspa dai format.
164 */
165static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
166				 unsigned int fmt)
167{
168	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(cpu_dai);
169
170	/* reset port settings */
171	sspa->sp   = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
172	sspa->ctrl = 0;
173
174	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
175	case SND_SOC_DAIFMT_BP_FP:
176		sspa->sp |= SSPA_SP_MSL;
177		break;
178	case SND_SOC_DAIFMT_BC_FC:
179		break;
180	default:
181		return -EINVAL;
182	}
183
184	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
185	case SND_SOC_DAIFMT_NB_NF:
186		sspa->sp |= SSPA_SP_FSP;
187		break;
188	default:
189		return -EINVAL;
190	}
191
192	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
193	case SND_SOC_DAIFMT_I2S:
194		sspa->ctrl |= SSPA_CTL_XDATDLY(1);
195		break;
196	default:
197		return -EINVAL;
198	}
199
200	/* Since we are configuring the timings for the format by hand
201	 * we have to defer some things until hw_params() where we
202	 * know parameters like the sample size.
203	 */
204	return 0;
205}
206
207/*
208 * Set the SSPA audio DMA parameters and sample size.
209 * Can be called multiple times by oss emulation.
210 */
211static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
212			       struct snd_pcm_hw_params *params,
213			       struct snd_soc_dai *dai)
214{
215	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
216	struct device *dev = dai->component->dev;
217	u32 sspa_ctrl = sspa->ctrl;
218	int bits;
219	int bitval;
220
221	switch (params_format(params)) {
222	case SNDRV_PCM_FORMAT_S8:
223		bits = 8;
224		bitval = SSPA_CTL_8_BITS;
225		break;
226	case SNDRV_PCM_FORMAT_S16_LE:
227		bits = 16;
228		bitval = SSPA_CTL_16_BITS;
229		break;
230	case SNDRV_PCM_FORMAT_S24_3LE:
231		bits = 24;
232		bitval = SSPA_CTL_24_BITS;
233		break;
234	case SNDRV_PCM_FORMAT_S32_LE:
235		bits = 32;
236		bitval = SSPA_CTL_32_BITS;
237		break;
238	default:
239		return -EINVAL;
240	}
241
242	sspa_ctrl &= ~SSPA_CTL_XPH;
243	if (dev->of_node || params_channels(params) == 2)
244		sspa_ctrl |= SSPA_CTL_XPH;
245
246	sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
247	sspa_ctrl |= SSPA_CTL_XWDLEN1(bitval);
248
249	sspa_ctrl &= ~SSPA_CTL_XWDLEN2_MASK;
250	sspa_ctrl |= SSPA_CTL_XWDLEN2(bitval);
251
252	sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
253	sspa_ctrl |= SSPA_CTL_XSSZ1(bitval);
254
255	sspa_ctrl &= ~SSPA_CTL_XSSZ2_MASK;
256	sspa_ctrl |= SSPA_CTL_XSSZ2(bitval);
257
258	sspa->sp &= ~SSPA_SP_FWID_MASK;
259	sspa->sp |= SSPA_SP_FWID(bits - 1);
260
261	sspa->sp &= ~SSPA_TXSP_FPER_MASK;
262	sspa->sp |= SSPA_TXSP_FPER(bits * 2 - 1);
263
264	if (dev->of_node) {
265		clk_set_rate(sspa->clk, params_rate(params) *
266					params_channels(params) * bits);
267	}
268
269	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
270		__raw_writel(sspa_ctrl, sspa->tx_base + SSPA_CTL);
271		__raw_writel(0x1, sspa->tx_base + SSPA_FIFO_UL);
272	} else {
273		__raw_writel(sspa_ctrl, sspa->rx_base + SSPA_CTL);
274		__raw_writel(0x0, sspa->rx_base + SSPA_FIFO_UL);
275	}
276
277	return 0;
278}
279
280static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
281			     struct snd_soc_dai *dai)
282{
283	struct sspa_priv *sspa = snd_soc_dai_get_drvdata(dai);
284	int ret = 0;
285
286	switch (cmd) {
287	case SNDRV_PCM_TRIGGER_START:
288	case SNDRV_PCM_TRIGGER_RESUME:
289	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
290		/*
291		 * whatever playback or capture, must enable rx.
292		 * this is a hw issue, so need check if rx has been
293		 * enabled or not; if has been enabled by another
294		 * stream, do not enable again.
295		 */
296		if (!sspa->running_cnt)
297			mmp_sspa_rx_enable(sspa);
298
299		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
300			mmp_sspa_tx_enable(sspa);
301
302		sspa->running_cnt++;
303		break;
304
305	case SNDRV_PCM_TRIGGER_STOP:
306	case SNDRV_PCM_TRIGGER_SUSPEND:
307	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
308		sspa->running_cnt--;
309
310		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
311			mmp_sspa_tx_disable(sspa);
312
313		/* have no capture stream, disable rx port */
314		if (!sspa->running_cnt)
315			mmp_sspa_rx_disable(sspa);
316		break;
317
318	default:
319		ret = -EINVAL;
320	}
321
322	return ret;
323}
324
325static int mmp_sspa_probe(struct snd_soc_dai *dai)
326{
327	struct sspa_priv *sspa = dev_get_drvdata(dai->dev);
328
329	snd_soc_dai_init_dma_data(dai,
330				&sspa->playback_dma_data,
331				&sspa->capture_dma_data);
332
333	return 0;
334}
335
336#define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
337#define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
338		SNDRV_PCM_FMTBIT_S16_LE | \
339		SNDRV_PCM_FMTBIT_S24_3LE | \
340		SNDRV_PCM_FMTBIT_S32_LE)
341
342static const struct snd_soc_dai_ops mmp_sspa_dai_ops = {
343	.probe		= mmp_sspa_probe,
344	.startup	= mmp_sspa_startup,
345	.shutdown	= mmp_sspa_shutdown,
346	.trigger	= mmp_sspa_trigger,
347	.hw_params	= mmp_sspa_hw_params,
348	.set_sysclk	= mmp_sspa_set_dai_sysclk,
349	.set_pll	= mmp_sspa_set_dai_pll,
350	.set_fmt	= mmp_sspa_set_dai_fmt,
351};
352
353static struct snd_soc_dai_driver mmp_sspa_dai = {
354	.playback = {
355		.channels_min = 1,
356		.channels_max = 128,
357		.rates = MMP_SSPA_RATES,
358		.formats = MMP_SSPA_FORMATS,
359	},
360	.capture = {
361		.channels_min = 1,
362		.channels_max = 2,
363		.rates = MMP_SSPA_RATES,
364		.formats = MMP_SSPA_FORMATS,
365	},
366	.ops = &mmp_sspa_dai_ops,
367};
368
369#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |	\
370		SNDRV_PCM_INFO_MMAP_VALID |	\
371		SNDRV_PCM_INFO_INTERLEAVED |	\
372		SNDRV_PCM_INFO_PAUSE |		\
373		SNDRV_PCM_INFO_RESUME |		\
374		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
375
376static const struct snd_pcm_hardware mmp_pcm_hardware[] = {
377	{
378		.info			= MMP_PCM_INFO,
379		.period_bytes_min	= 1024,
380		.period_bytes_max	= 2048,
381		.periods_min		= 2,
382		.periods_max		= 32,
383		.buffer_bytes_max	= 4096,
384		.fifo_size		= 32,
385	},
386	{
387		.info			= MMP_PCM_INFO,
388		.period_bytes_min	= 1024,
389		.period_bytes_max	= 2048,
390		.periods_min		= 2,
391		.periods_max		= 32,
392		.buffer_bytes_max	= 4096,
393		.fifo_size		= 32,
394	},
395};
396
397static const struct snd_dmaengine_pcm_config mmp_pcm_config = {
398	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
399	.pcm_hardware = mmp_pcm_hardware,
400	.prealloc_buffer_size = 4096,
401};
402
403static int mmp_pcm_mmap(struct snd_soc_component *component,
404			struct snd_pcm_substream *substream,
405			struct vm_area_struct *vma)
406{
407	vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP);
408	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
409	return remap_pfn_range(vma, vma->vm_start,
410		substream->dma_buffer.addr >> PAGE_SHIFT,
411		vma->vm_end - vma->vm_start, vma->vm_page_prot);
412}
413
414static int mmp_sspa_open(struct snd_soc_component *component,
415			 struct snd_pcm_substream *substream)
416{
417	struct sspa_priv *sspa = snd_soc_component_get_drvdata(component);
418
419	pm_runtime_get_sync(component->dev);
420
421	/* we can only change the settings if the port is not in use */
422	if ((__raw_readl(sspa->tx_base + SSPA_SP) & SSPA_SP_S_EN) ||
423	    (__raw_readl(sspa->rx_base + SSPA_SP) & SSPA_SP_S_EN)) {
424		dev_err(component->dev,
425			"can't change hardware dai format: stream is in use\n");
426		return -EBUSY;
427	}
428
429	__raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
430	__raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
431
432	sspa->sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
433	__raw_writel(sspa->sp, sspa->tx_base + SSPA_SP);
434	__raw_writel(sspa->sp, sspa->rx_base + SSPA_SP);
435
436	/*
437	 * FIXME: hw issue, for the tx serial port,
438	 * can not config the master/slave mode;
439	 * so must clean this bit.
440	 * The master/slave mode has been set in the
441	 * rx port.
442	 */
443	__raw_writel(sspa->sp & ~SSPA_SP_MSL, sspa->tx_base + SSPA_SP);
444
445	__raw_writel(sspa->ctrl, sspa->tx_base + SSPA_CTL);
446	__raw_writel(sspa->ctrl, sspa->rx_base + SSPA_CTL);
447
448	return 0;
449}
450
451static int mmp_sspa_close(struct snd_soc_component *component,
452			  struct snd_pcm_substream *substream)
453{
454	pm_runtime_put_sync(component->dev);
455	return 0;
456}
457
458static const struct snd_soc_component_driver mmp_sspa_component = {
459	.name			= "mmp-sspa",
460	.mmap			= mmp_pcm_mmap,
461	.open			= mmp_sspa_open,
462	.close			= mmp_sspa_close,
463	.legacy_dai_naming	= 1,
464};
465
466static int asoc_mmp_sspa_probe(struct platform_device *pdev)
467{
468	struct sspa_priv *sspa;
469	int ret;
470
471	sspa = devm_kzalloc(&pdev->dev,
472				sizeof(struct sspa_priv), GFP_KERNEL);
473	if (!sspa)
474		return -ENOMEM;
475
476	if (pdev->dev.of_node) {
477		sspa->rx_base = devm_platform_ioremap_resource(pdev, 0);
478		if (IS_ERR(sspa->rx_base))
479			return PTR_ERR(sspa->rx_base);
480
481		sspa->tx_base = devm_platform_ioremap_resource(pdev, 1);
482		if (IS_ERR(sspa->tx_base))
483			return PTR_ERR(sspa->tx_base);
484
485		sspa->clk = devm_clk_get(&pdev->dev, "bitclk");
486		if (IS_ERR(sspa->clk))
487			return PTR_ERR(sspa->clk);
488
489		sspa->audio_clk = devm_clk_get(&pdev->dev, "audio");
490		if (IS_ERR(sspa->audio_clk))
491			return PTR_ERR(sspa->audio_clk);
492	} else {
493		struct resource *res;
494
495		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
496		if (res == NULL)
497			return -ENODEV;
498
499		sspa->rx_base = devm_ioremap(&pdev->dev, res->start, 0x30);
500		if (!sspa->rx_base)
501			return -ENOMEM;
502
503		sspa->tx_base = devm_ioremap(&pdev->dev,
504					     res->start + 0x80, 0x30);
505		if (!sspa->tx_base)
506			return -ENOMEM;
507
508		sspa->clk = devm_clk_get(&pdev->dev, NULL);
509		if (IS_ERR(sspa->clk))
510			return PTR_ERR(sspa->clk);
511
512		sspa->audio_clk = clk_get(NULL, "mmp-audio");
513		if (IS_ERR(sspa->audio_clk))
514			return PTR_ERR(sspa->audio_clk);
515
516		sspa->sysclk = clk_get(NULL, "mmp-sysclk");
517		if (IS_ERR(sspa->sysclk)) {
518			clk_put(sspa->audio_clk);
519			return PTR_ERR(sspa->sysclk);
520		}
521	}
522	platform_set_drvdata(pdev, sspa);
523
524	sspa->playback_dma_data.maxburst = 4;
525	sspa->capture_dma_data.maxburst = 4;
526	/* You know, these addresses are actually ignored. */
527	sspa->capture_dma_data.addr = SSPA_D;
528	sspa->playback_dma_data.addr = 0x80 + SSPA_D;
529
530	if (pdev->dev.of_node) {
531		ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
532						      &mmp_pcm_config, 0);
533		if (ret)
534			return ret;
535	}
536
537	ret = devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
538					      &mmp_sspa_dai, 1);
539	if (ret)
540		return ret;
541
542	pm_runtime_enable(&pdev->dev);
543	clk_prepare_enable(sspa->audio_clk);
544
545	return 0;
546}
547
548static void asoc_mmp_sspa_remove(struct platform_device *pdev)
549{
550	struct sspa_priv *sspa = platform_get_drvdata(pdev);
551
552	clk_disable_unprepare(sspa->audio_clk);
553	pm_runtime_disable(&pdev->dev);
554
555	if (pdev->dev.of_node)
556		return;
557
558	clk_put(sspa->audio_clk);
559	clk_put(sspa->sysclk);
560}
561
562#ifdef CONFIG_OF
563static const struct of_device_id mmp_sspa_of_match[] = {
564	{ .compatible = "marvell,mmp-sspa" },
565	{},
566};
567
568MODULE_DEVICE_TABLE(of, mmp_sspa_of_match);
569#endif
570
571static struct platform_driver asoc_mmp_sspa_driver = {
572	.driver = {
573		.name = "mmp-sspa-dai",
574		.of_match_table = of_match_ptr(mmp_sspa_of_match),
575	},
576	.probe = asoc_mmp_sspa_probe,
577	.remove_new = asoc_mmp_sspa_remove,
578};
579
580module_platform_driver(asoc_mmp_sspa_driver);
581
582MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
583MODULE_DESCRIPTION("MMP SSPA SoC Interface");
584MODULE_LICENSE("GPL");
585MODULE_ALIAS("platform:mmp-sspa-dai");
586