1// SPDX-License-Identifier: GPL-2.0+
2//
3// ALSA Soc Audio Layer - S3C2412 I2S driver
4//
5// Copyright (c) 2006 Wolfson Microelectronics PLC.
6//	Graeme Gregory graeme.gregory@wolfsonmicro.com
7//	linux@wolfsonmicro.com
8//
9// Copyright (c) 2007, 2004-2005 Simtec Electronics
10//	http://armlinux.simtec.co.uk/
11//	Ben Dooks <ben@simtec.co.uk>
12
13#include <linux/delay.h>
14#include <linux/gpio.h>
15#include <linux/clk.h>
16#include <linux/io.h>
17#include <linux/module.h>
18
19#include <sound/soc.h>
20#include <sound/pcm_params.h>
21
22#include "dma.h"
23#include "regs-i2s-v2.h"
24#include "s3c2412-i2s.h"
25
26#include <linux/platform_data/asoc-s3c.h>
27
28static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
29	.chan_name	= "tx",
30	.addr_width	= 4,
31};
32
33static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
34	.chan_name	= "rx",
35	.addr_width	= 4,
36};
37
38static struct s3c_i2sv2_info s3c2412_i2s;
39
40static int s3c2412_i2s_probe(struct snd_soc_dai *dai)
41{
42	int ret;
43
44	pr_debug("Entered %s\n", __func__);
45
46	snd_soc_dai_init_dma_data(dai, &s3c2412_i2s_pcm_stereo_out,
47					&s3c2412_i2s_pcm_stereo_in);
48
49	ret = s3c_i2sv2_probe(dai, &s3c2412_i2s);
50	if (ret)
51		return ret;
52
53	s3c2412_i2s.dma_capture = &s3c2412_i2s_pcm_stereo_in;
54	s3c2412_i2s.dma_playback = &s3c2412_i2s_pcm_stereo_out;
55
56	s3c2412_i2s.iis_cclk = devm_clk_get(dai->dev, "i2sclk");
57	if (IS_ERR(s3c2412_i2s.iis_cclk)) {
58		pr_err("failed to get i2sclk clock\n");
59		ret = PTR_ERR(s3c2412_i2s.iis_cclk);
60		goto err;
61	}
62
63	/* Set MPLL as the source for IIS CLK */
64
65	clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
66	ret = clk_prepare_enable(s3c2412_i2s.iis_cclk);
67	if (ret)
68		goto err;
69
70	return 0;
71
72err:
73	s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
74
75	return ret;
76}
77
78static int s3c2412_i2s_remove(struct snd_soc_dai *dai)
79{
80	clk_disable_unprepare(s3c2412_i2s.iis_cclk);
81	s3c_i2sv2_cleanup(dai, &s3c2412_i2s);
82
83	return 0;
84}
85
86static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
87				 struct snd_pcm_hw_params *params,
88				 struct snd_soc_dai *cpu_dai)
89{
90	struct s3c_i2sv2_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
91	u32 iismod;
92
93	pr_debug("Entered %s\n", __func__);
94
95	iismod = readl(i2s->regs + S3C2412_IISMOD);
96	pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
97
98	switch (params_width(params)) {
99	case 8:
100		iismod |= S3C2412_IISMOD_8BIT;
101		break;
102	case 16:
103		iismod &= ~S3C2412_IISMOD_8BIT;
104		break;
105	}
106
107	writel(iismod, i2s->regs + S3C2412_IISMOD);
108	pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
109
110	return 0;
111}
112
113#ifdef CONFIG_PM
114static int s3c2412_i2s_suspend(struct snd_soc_component *component)
115{
116	struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component);
117	u32 iismod;
118
119	if (component->active) {
120		i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
121		i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
122		i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
123
124		/* some basic suspend checks */
125
126		iismod = readl(i2s->regs + S3C2412_IISMOD);
127
128		if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
129			pr_warn("%s: RXDMA active?\n", __func__);
130
131		if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
132			pr_warn("%s: TXDMA active?\n", __func__);
133
134		if (iismod & S3C2412_IISCON_IIS_ACTIVE)
135			pr_warn("%s: IIS active\n", __func__);
136	}
137
138	return 0;
139}
140
141static int s3c2412_i2s_resume(struct snd_soc_component *component)
142{
143	struct s3c_i2sv2_info *i2s = snd_soc_component_get_drvdata(component);
144
145	pr_info("component_active %d, IISMOD %08x, IISCON %08x\n",
146		component->active, i2s->suspend_iismod, i2s->suspend_iiscon);
147
148	if (component->active) {
149		writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
150		writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
151		writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
152
153		writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
154		       i2s->regs + S3C2412_IISFIC);
155
156		ndelay(250);
157		writel(0x0, i2s->regs + S3C2412_IISFIC);
158	}
159
160	return 0;
161}
162#else
163#define s3c2412_i2s_suspend NULL
164#define s3c2412_i2s_resume  NULL
165#endif
166
167#define S3C2412_I2S_RATES \
168	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
169	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
170	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
171
172static const struct snd_soc_dai_ops s3c2412_i2s_dai_ops = {
173	.hw_params	= s3c2412_i2s_hw_params,
174};
175
176static struct snd_soc_dai_driver s3c2412_i2s_dai = {
177	.probe		= s3c2412_i2s_probe,
178	.remove	= s3c2412_i2s_remove,
179	.playback = {
180		.channels_min	= 2,
181		.channels_max	= 2,
182		.rates		= S3C2412_I2S_RATES,
183		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
184	},
185	.capture = {
186		.channels_min	= 2,
187		.channels_max	= 2,
188		.rates		= S3C2412_I2S_RATES,
189		.formats	= SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
190	},
191	.ops = &s3c2412_i2s_dai_ops,
192};
193
194static const struct snd_soc_component_driver s3c2412_i2s_component = {
195	.name		= "s3c2412-i2s",
196	.suspend	= s3c2412_i2s_suspend,
197	.resume		= s3c2412_i2s_resume,
198};
199
200static int s3c2412_iis_dev_probe(struct platform_device *pdev)
201{
202	int ret = 0;
203	struct resource *res;
204	struct s3c_audio_pdata *pdata = dev_get_platdata(&pdev->dev);
205
206	if (!pdata) {
207		dev_err(&pdev->dev, "missing platform data");
208		return -ENXIO;
209	}
210
211	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
212	s3c2412_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
213	if (IS_ERR(s3c2412_i2s.regs))
214		return PTR_ERR(s3c2412_i2s.regs);
215
216	s3c2412_i2s_pcm_stereo_out.addr = res->start + S3C2412_IISTXD;
217	s3c2412_i2s_pcm_stereo_out.filter_data = pdata->dma_playback;
218	s3c2412_i2s_pcm_stereo_in.addr = res->start + S3C2412_IISRXD;
219	s3c2412_i2s_pcm_stereo_in.filter_data = pdata->dma_capture;
220
221	ret = samsung_asoc_dma_platform_register(&pdev->dev,
222						 pdata->dma_filter,
223						 "tx", "rx", NULL);
224	if (ret) {
225		pr_err("failed to register the DMA: %d\n", ret);
226		return ret;
227	}
228
229	ret = s3c_i2sv2_register_component(&pdev->dev, -1,
230					   &s3c2412_i2s_component,
231					   &s3c2412_i2s_dai);
232	if (ret)
233		pr_err("failed to register the dai\n");
234
235	return ret;
236}
237
238static struct platform_driver s3c2412_iis_driver = {
239	.probe  = s3c2412_iis_dev_probe,
240	.driver = {
241		.name = "s3c2412-iis",
242	},
243};
244
245module_platform_driver(s3c2412_iis_driver);
246
247/* Module information */
248MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
249MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
250MODULE_LICENSE("GPL");
251MODULE_ALIAS("platform:s3c2412-iis");
252