1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) STMicroelectronics SA 2015
4 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
5 *          for STMicroelectronics.
6 */
7
8#include <linux/io.h>
9#include <linux/module.h>
10#include <linux/regmap.h>
11#include <linux/reset.h>
12#include <linux/mfd/syscon.h>
13
14#include <sound/soc.h>
15#include <sound/soc-dapm.h>
16
17/* DAC definitions */
18
19/* stih407 DAC registers */
20/* sysconf 5041: Audio-Gue-Control */
21#define STIH407_AUDIO_GLUE_CTRL 0x000000A4
22/* sysconf 5042: Audio-DAC-Control */
23#define STIH407_AUDIO_DAC_CTRL 0x000000A8
24
25/* DAC definitions */
26#define STIH407_DAC_SOFTMUTE		0x0
27#define STIH407_DAC_STANDBY_ANA		0x1
28#define STIH407_DAC_STANDBY		0x2
29
30#define STIH407_DAC_SOFTMUTE_MASK	BIT(STIH407_DAC_SOFTMUTE)
31#define STIH407_DAC_STANDBY_ANA_MASK    BIT(STIH407_DAC_STANDBY_ANA)
32#define STIH407_DAC_STANDBY_MASK        BIT(STIH407_DAC_STANDBY)
33
34/* SPDIF definitions */
35#define SPDIF_BIPHASE_ENABLE		0x6
36#define SPDIF_BIPHASE_IDLE		0x7
37
38#define SPDIF_BIPHASE_ENABLE_MASK	BIT(SPDIF_BIPHASE_ENABLE)
39#define SPDIF_BIPHASE_IDLE_MASK		BIT(SPDIF_BIPHASE_IDLE)
40
41enum {
42	STI_SAS_DAI_SPDIF_OUT,
43	STI_SAS_DAI_ANALOG_OUT,
44};
45
46static const struct reg_default stih407_sas_reg_defaults[] = {
47	{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
48	{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
49};
50
51struct sti_dac_audio {
52	struct regmap *regmap;
53	struct regmap *virt_regmap;
54	struct regmap_field  **field;
55	struct reset_control *rst;
56	int mclk;
57};
58
59struct sti_spdif_audio {
60	struct regmap *regmap;
61	struct regmap_field  **field;
62	int mclk;
63};
64
65/* device data structure */
66struct sti_sas_dev_data {
67	const struct regmap_config *regmap;
68	const struct snd_soc_dai_ops *dac_ops;  /* DAC function callbacks */
69	const struct snd_soc_dapm_widget *dapm_widgets; /* dapms declaration */
70	const int num_dapm_widgets; /* dapms declaration */
71	const struct snd_soc_dapm_route *dapm_routes; /* route declaration */
72	const int num_dapm_routes; /* route declaration */
73};
74
75/* driver data structure */
76struct sti_sas_data {
77	struct device *dev;
78	const struct sti_sas_dev_data *dev_data;
79	struct sti_dac_audio dac;
80	struct sti_spdif_audio spdif;
81};
82
83/* Read a register from the sysconf reg bank */
84static int sti_sas_read_reg(void *context, unsigned int reg,
85			    unsigned int *value)
86{
87	struct sti_sas_data *drvdata = context;
88	int status;
89	u32 val;
90
91	status = regmap_read(drvdata->dac.regmap, reg, &val);
92	*value = (unsigned int)val;
93
94	return status;
95}
96
97/* Read a register from the sysconf reg bank */
98static int sti_sas_write_reg(void *context, unsigned int reg,
99			     unsigned int value)
100{
101	struct sti_sas_data *drvdata = context;
102	int status;
103
104	status = regmap_write(drvdata->dac.regmap, reg, value);
105
106	return status;
107}
108
109static int  sti_sas_init_sas_registers(struct snd_soc_component *component,
110				       struct sti_sas_data *data)
111{
112	int ret;
113	/*
114	 * DAC and SPDIF are activated by default
115	 * put them in IDLE to save power
116	 */
117
118	/* Initialise bi-phase formatter to disabled */
119	ret = snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
120				  SPDIF_BIPHASE_ENABLE_MASK, 0);
121
122	if (!ret)
123		/* Initialise bi-phase formatter idle value to 0 */
124		ret = snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
125					  SPDIF_BIPHASE_IDLE_MASK, 0);
126	if (ret < 0) {
127		dev_err(component->dev, "Failed to update SPDIF registers\n");
128		return ret;
129	}
130
131	/* Init DAC configuration */
132	/* init configuration */
133	ret =  snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
134				   STIH407_DAC_STANDBY_MASK,
135				   STIH407_DAC_STANDBY_MASK);
136
137	if (!ret)
138		ret = snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
139					  STIH407_DAC_STANDBY_ANA_MASK,
140					  STIH407_DAC_STANDBY_ANA_MASK);
141	if (!ret)
142		ret = snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
143					  STIH407_DAC_SOFTMUTE_MASK,
144					  STIH407_DAC_SOFTMUTE_MASK);
145
146	if (ret < 0) {
147		dev_err(component->dev, "Failed to update DAC registers\n");
148		return ret;
149	}
150
151	return ret;
152}
153
154/*
155 * DAC
156 */
157static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
158{
159	/* Sanity check only */
160	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
161		dev_err(dai->component->dev,
162			"%s: ERROR: Unsupporter master mask 0x%x\n",
163			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
164		return -EINVAL;
165	}
166
167	return 0;
168}
169
170static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
171	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
172			     STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
173	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH407_AUDIO_DAC_CTRL,
174			 STIH407_DAC_STANDBY, 1),
175	SND_SOC_DAPM_OUTPUT("DAC Output"),
176};
177
178static const struct snd_soc_dapm_route stih407_sas_route[] = {
179	{"DAC Output", NULL, "DAC standby ana"},
180	{"DAC standby ana", NULL, "DAC standby"},
181};
182
183
184static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
185{
186	struct snd_soc_component *component = dai->component;
187
188	if (mute) {
189		return snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
190					    STIH407_DAC_SOFTMUTE_MASK,
191					    STIH407_DAC_SOFTMUTE_MASK);
192	} else {
193		return snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
194					    STIH407_DAC_SOFTMUTE_MASK,
195					    0);
196	}
197}
198
199/*
200 * SPDIF
201 */
202static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
203				 unsigned int fmt)
204{
205	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
206		dev_err(dai->component->dev,
207			"%s: ERROR: Unsupporter master mask 0x%x\n",
208			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
209		return -EINVAL;
210	}
211
212	return 0;
213}
214
215/*
216 * sti_sas_spdif_trigger:
217 * Trigger function is used to ensure that BiPhase Formater is disabled
218 * before CPU dai is stopped.
219 * This is mandatory to avoid that BPF is stalled
220 */
221static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
222				 struct snd_soc_dai *dai)
223{
224	struct snd_soc_component *component = dai->component;
225
226	switch (cmd) {
227	case SNDRV_PCM_TRIGGER_START:
228	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
229		return snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
230					    SPDIF_BIPHASE_ENABLE_MASK,
231					    SPDIF_BIPHASE_ENABLE_MASK);
232	case SNDRV_PCM_TRIGGER_RESUME:
233	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
234	case SNDRV_PCM_TRIGGER_STOP:
235	case SNDRV_PCM_TRIGGER_SUSPEND:
236		return snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
237					    SPDIF_BIPHASE_ENABLE_MASK,
238					    0);
239	default:
240		return -EINVAL;
241	}
242}
243
244static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
245{
246	if (reg == STIH407_AUDIO_GLUE_CTRL)
247		return true;
248
249	return false;
250}
251
252/*
253 * CODEC DAIS
254 */
255
256/*
257 * sti_sas_set_sysclk:
258 * get MCLK input frequency to check that MCLK-FS ratio is coherent
259 */
260static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
261			      unsigned int freq, int dir)
262{
263	struct snd_soc_component *component = dai->component;
264	struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
265
266	if (dir == SND_SOC_CLOCK_OUT)
267		return 0;
268
269	if (clk_id != 0)
270		return -EINVAL;
271
272	switch (dai->id) {
273	case STI_SAS_DAI_SPDIF_OUT:
274		drvdata->spdif.mclk = freq;
275		break;
276
277	case STI_SAS_DAI_ANALOG_OUT:
278		drvdata->dac.mclk = freq;
279		break;
280	}
281
282	return 0;
283}
284
285static int sti_sas_prepare(struct snd_pcm_substream *substream,
286			   struct snd_soc_dai *dai)
287{
288	struct snd_soc_component *component = dai->component;
289	struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
290	struct snd_pcm_runtime *runtime = substream->runtime;
291
292	switch (dai->id) {
293	case STI_SAS_DAI_SPDIF_OUT:
294		if ((drvdata->spdif.mclk / runtime->rate) != 128) {
295			dev_err(component->dev, "unexpected mclk-fs ratio\n");
296			return -EINVAL;
297		}
298		break;
299	case STI_SAS_DAI_ANALOG_OUT:
300		if ((drvdata->dac.mclk / runtime->rate) != 256) {
301			dev_err(component->dev, "unexpected mclk-fs ratio\n");
302			return -EINVAL;
303		}
304		break;
305	}
306
307	return 0;
308}
309
310static const struct snd_soc_dai_ops stih407_dac_ops = {
311	.set_fmt = sti_sas_dac_set_fmt,
312	.mute_stream = stih407_sas_dac_mute,
313	.prepare = sti_sas_prepare,
314	.set_sysclk = sti_sas_set_sysclk,
315};
316
317static const struct regmap_config stih407_sas_regmap = {
318	.reg_bits = 32,
319	.val_bits = 32,
320	.fast_io = true,
321	.max_register = STIH407_AUDIO_DAC_CTRL,
322	.reg_defaults = stih407_sas_reg_defaults,
323	.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
324	.volatile_reg = sti_sas_volatile_register,
325	.cache_type = REGCACHE_RBTREE,
326	.reg_read = sti_sas_read_reg,
327	.reg_write = sti_sas_write_reg,
328};
329
330static const struct sti_sas_dev_data stih407_data = {
331	.regmap = &stih407_sas_regmap,
332	.dac_ops = &stih407_dac_ops,
333	.dapm_widgets = stih407_sas_dapm_widgets,
334	.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
335	.dapm_routes =	stih407_sas_route,
336	.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
337};
338
339static struct snd_soc_dai_driver sti_sas_dai[] = {
340	{
341		.name = "sas-dai-spdif-out",
342		.id = STI_SAS_DAI_SPDIF_OUT,
343		.playback = {
344			.stream_name = "spdif_p",
345			.channels_min = 2,
346			.channels_max = 2,
347			.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
348				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 |
349				 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
350				 SNDRV_PCM_RATE_192000,
351			.formats = SNDRV_PCM_FMTBIT_S16_LE |
352				   SNDRV_PCM_FMTBIT_S32_LE,
353		},
354		.ops = (struct snd_soc_dai_ops[]) {
355			{
356				.set_fmt = sti_sas_spdif_set_fmt,
357				.trigger = sti_sas_spdif_trigger,
358				.set_sysclk = sti_sas_set_sysclk,
359				.prepare = sti_sas_prepare,
360			}
361		},
362	},
363	{
364		.name = "sas-dai-dac",
365		.id = STI_SAS_DAI_ANALOG_OUT,
366		.playback = {
367			.stream_name = "dac_p",
368			.channels_min = 2,
369			.channels_max = 2,
370			.rates = SNDRV_PCM_RATE_8000_48000,
371			.formats = SNDRV_PCM_FMTBIT_S16_LE |
372				   SNDRV_PCM_FMTBIT_S32_LE,
373		},
374	},
375};
376
377#ifdef CONFIG_PM_SLEEP
378static int sti_sas_resume(struct snd_soc_component *component)
379{
380	struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
381
382	return sti_sas_init_sas_registers(component, drvdata);
383}
384#else
385#define sti_sas_resume NULL
386#endif
387
388static int sti_sas_component_probe(struct snd_soc_component *component)
389{
390	struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
391	int ret;
392
393	ret = sti_sas_init_sas_registers(component, drvdata);
394
395	return ret;
396}
397
398static struct snd_soc_component_driver sti_sas_driver = {
399	.probe			= sti_sas_component_probe,
400	.resume			= sti_sas_resume,
401	.idle_bias_on		= 1,
402	.use_pmdown_time	= 1,
403	.endianness		= 1,
404	.non_legacy_dai_naming	= 1,
405};
406
407static const struct of_device_id sti_sas_dev_match[] = {
408	{
409		.compatible = "st,stih407-sas-codec",
410		.data = &stih407_data,
411	},
412	{},
413};
414MODULE_DEVICE_TABLE(of, sti_sas_dev_match);
415
416static int sti_sas_driver_probe(struct platform_device *pdev)
417{
418	struct device_node *pnode = pdev->dev.of_node;
419	struct sti_sas_data *drvdata;
420	const struct of_device_id *of_id;
421
422	/* Allocate device structure */
423	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
424			       GFP_KERNEL);
425	if (!drvdata)
426		return -ENOMEM;
427
428	/* Populate data structure depending on compatibility */
429	of_id = of_match_node(sti_sas_dev_match, pnode);
430	if (!of_id->data) {
431		dev_err(&pdev->dev, "data associated to device is missing\n");
432		return -EINVAL;
433	}
434
435	drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data;
436
437	/* Initialise device structure */
438	drvdata->dev = &pdev->dev;
439
440	/* Request the DAC & SPDIF registers memory region */
441	drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
442						    drvdata->dev_data->regmap);
443	if (IS_ERR(drvdata->dac.virt_regmap)) {
444		dev_err(&pdev->dev, "audio registers not enabled\n");
445		return PTR_ERR(drvdata->dac.virt_regmap);
446	}
447
448	/* Request the syscon region */
449	drvdata->dac.regmap =
450		syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
451	if (IS_ERR(drvdata->dac.regmap)) {
452		dev_err(&pdev->dev, "syscon registers not available\n");
453		return PTR_ERR(drvdata->dac.regmap);
454	}
455	drvdata->spdif.regmap = drvdata->dac.regmap;
456
457	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;
458
459	/* Set dapms*/
460	sti_sas_driver.dapm_widgets = drvdata->dev_data->dapm_widgets;
461	sti_sas_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets;
462
463	sti_sas_driver.dapm_routes = drvdata->dev_data->dapm_routes;
464	sti_sas_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes;
465
466	/* Store context */
467	dev_set_drvdata(&pdev->dev, drvdata);
468
469	return devm_snd_soc_register_component(&pdev->dev, &sti_sas_driver,
470					sti_sas_dai,
471					ARRAY_SIZE(sti_sas_dai));
472}
473
474static struct platform_driver sti_sas_platform_driver = {
475	.driver = {
476		.name = "sti-sas-codec",
477		.of_match_table = sti_sas_dev_match,
478	},
479	.probe = sti_sas_driver_probe,
480};
481
482module_platform_driver(sti_sas_platform_driver);
483
484MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
485MODULE_AUTHOR("Arnaud.pouliquen@st.com");
486MODULE_LICENSE("GPL v2");
487