1/*
2 * ALSA SoC SPDIF Out Audio Layer for spear processors
3 *
4 * Copyright (C) 2012 ST Microelectronics
5 * Vipin Kumar <vipin.kumar@st.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/device.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/io.h>
18#include <linux/ioport.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <sound/dmaengine_pcm.h>
22#include <sound/soc.h>
23#include <sound/spear_dma.h>
24#include <sound/spear_spdif.h>
25#include "spdif_out_regs.h"
26#include "spear_pcm.h"
27
28struct spdif_out_params {
29	u32 rate;
30	u32 core_freq;
31	u32 mute;
32};
33
34struct spdif_out_dev {
35	struct clk *clk;
36	struct spear_dma_data dma_params;
37	struct spdif_out_params saved_params;
38	u32 running;
39	void __iomem *io_base;
40	struct snd_dmaengine_dai_dma_data dma_params_tx;
41	struct snd_dmaengine_pcm_config config;
42};
43
44static void spdif_out_configure(struct spdif_out_dev *host)
45{
46	writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
47	mdelay(1);
48	writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
49			host->io_base + SPDIF_OUT_SOFT_RST);
50
51	writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
52			SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
53			SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
54			host->io_base + SPDIF_OUT_CFG);
55
56	writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
57	writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
58}
59
60static int spdif_out_startup(struct snd_pcm_substream *substream,
61		struct snd_soc_dai *cpu_dai)
62{
63	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
64	int ret;
65
66	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
67		return -EINVAL;
68
69	ret = clk_enable(host->clk);
70	if (ret)
71		return ret;
72
73	host->running = true;
74	spdif_out_configure(host);
75
76	return 0;
77}
78
79static void spdif_out_shutdown(struct snd_pcm_substream *substream,
80		struct snd_soc_dai *dai)
81{
82	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
83
84	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
85		return;
86
87	clk_disable(host->clk);
88	host->running = false;
89}
90
91static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
92		u32 rate)
93{
94	u32 divider, ctrl;
95
96	clk_set_rate(host->clk, core_freq);
97	divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
98
99	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
100	ctrl &= ~SPDIF_DIVIDER_MASK;
101	ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
102	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
103}
104
105static int spdif_out_hw_params(struct snd_pcm_substream *substream,
106		struct snd_pcm_hw_params *params,
107		struct snd_soc_dai *dai)
108{
109	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
110	u32 rate, core_freq;
111
112	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
113		return -EINVAL;
114
115	rate = params_rate(params);
116
117	switch (rate) {
118	case 8000:
119	case 16000:
120	case 32000:
121	case 64000:
122		/*
123		 * The clock is multiplied by 10 to bring it to feasible range
124		 * of frequencies for sscg
125		 */
126		core_freq = 64000 * 128 * 10;	/* 81.92 MHz */
127		break;
128	case 5512:
129	case 11025:
130	case 22050:
131	case 44100:
132	case 88200:
133	case 176400:
134		core_freq = 176400 * 128;	/* 22.5792 MHz */
135		break;
136	case 48000:
137	case 96000:
138	case 192000:
139	default:
140		core_freq = 192000 * 128;	/* 24.576 MHz */
141		break;
142	}
143
144	spdif_out_clock(host, core_freq, rate);
145	host->saved_params.core_freq = core_freq;
146	host->saved_params.rate = rate;
147
148	return 0;
149}
150
151static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
152		struct snd_soc_dai *dai)
153{
154	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
155	u32 ctrl;
156	int ret = 0;
157
158	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
159		return -EINVAL;
160
161	switch (cmd) {
162	case SNDRV_PCM_TRIGGER_START:
163	case SNDRV_PCM_TRIGGER_RESUME:
164	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
165			ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
166			ctrl &= ~SPDIF_OPMODE_MASK;
167			if (!host->saved_params.mute)
168				ctrl |= SPDIF_OPMODE_AUD_DATA |
169					SPDIF_STATE_NORMAL;
170			else
171				ctrl |= SPDIF_OPMODE_MUTE_PCM;
172			writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
173		break;
174
175	case SNDRV_PCM_TRIGGER_STOP:
176	case SNDRV_PCM_TRIGGER_SUSPEND:
177	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
178		ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
179		ctrl &= ~SPDIF_OPMODE_MASK;
180		ctrl |= SPDIF_OPMODE_OFF;
181		writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
182		break;
183
184	default:
185		ret = -EINVAL;
186		break;
187	}
188	return ret;
189}
190
191static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
192{
193	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
194	u32 val;
195
196	host->saved_params.mute = mute;
197	val = readl(host->io_base + SPDIF_OUT_CTRL);
198	val &= ~SPDIF_OPMODE_MASK;
199
200	if (mute)
201		val |= SPDIF_OPMODE_MUTE_PCM;
202	else {
203		if (host->running)
204			val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
205		else
206			val |= SPDIF_OPMODE_OFF;
207	}
208
209	writel(val, host->io_base + SPDIF_OUT_CTRL);
210	return 0;
211}
212
213static int spdif_mute_get(struct snd_kcontrol *kcontrol,
214		struct snd_ctl_elem_value *ucontrol)
215{
216	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
217	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
218
219	ucontrol->value.integer.value[0] = host->saved_params.mute;
220	return 0;
221}
222
223static int spdif_mute_put(struct snd_kcontrol *kcontrol,
224		struct snd_ctl_elem_value *ucontrol)
225{
226	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
227	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
228
229	if (host->saved_params.mute == ucontrol->value.integer.value[0])
230		return 0;
231
232	spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
233
234	return 1;
235}
236static const struct snd_kcontrol_new spdif_out_controls[] = {
237	SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
238			spdif_mute_get, spdif_mute_put),
239};
240
241static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
242{
243	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
244
245	host->dma_params_tx.filter_data = &host->dma_params;
246	dai->playback_dma_data = &host->dma_params_tx;
247
248	return snd_soc_add_dai_controls(dai, spdif_out_controls,
249				ARRAY_SIZE(spdif_out_controls));
250}
251
252static const struct snd_soc_dai_ops spdif_out_dai_ops = {
253	.digital_mute	= spdif_digital_mute,
254	.startup	= spdif_out_startup,
255	.shutdown	= spdif_out_shutdown,
256	.trigger	= spdif_out_trigger,
257	.hw_params	= spdif_out_hw_params,
258};
259
260static struct snd_soc_dai_driver spdif_out_dai = {
261	.playback = {
262		.channels_min = 2,
263		.channels_max = 2,
264		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
265				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
266				 SNDRV_PCM_RATE_192000),
267		.formats = SNDRV_PCM_FMTBIT_S16_LE,
268	},
269	.probe = spdif_soc_dai_probe,
270	.ops = &spdif_out_dai_ops,
271};
272
273static const struct snd_soc_component_driver spdif_out_component = {
274	.name		= "spdif-out",
275};
276
277static int spdif_out_probe(struct platform_device *pdev)
278{
279	struct spdif_out_dev *host;
280	struct spear_spdif_platform_data *pdata;
281	struct resource *res;
282	int ret;
283
284	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
285	if (!host) {
286		dev_warn(&pdev->dev, "kzalloc fail\n");
287		return -ENOMEM;
288	}
289
290	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
291	host->io_base = devm_ioremap_resource(&pdev->dev, res);
292	if (IS_ERR(host->io_base))
293		return PTR_ERR(host->io_base);
294
295	host->clk = devm_clk_get(&pdev->dev, NULL);
296	if (IS_ERR(host->clk))
297		return PTR_ERR(host->clk);
298
299	pdata = dev_get_platdata(&pdev->dev);
300
301	host->dma_params.data = pdata->dma_params;
302	host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
303	host->dma_params.max_burst = 16;
304	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
305
306	dev_set_drvdata(&pdev->dev, host);
307
308	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component,
309					      &spdif_out_dai, 1);
310	if (ret)
311		return ret;
312
313	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
314						pdata->filter);
315}
316
317#ifdef CONFIG_PM
318static int spdif_out_suspend(struct device *dev)
319{
320	struct platform_device *pdev = to_platform_device(dev);
321	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
322
323	if (host->running)
324		clk_disable(host->clk);
325
326	return 0;
327}
328
329static int spdif_out_resume(struct device *dev)
330{
331	struct platform_device *pdev = to_platform_device(dev);
332	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
333
334	if (host->running) {
335		clk_enable(host->clk);
336		spdif_out_configure(host);
337		spdif_out_clock(host, host->saved_params.core_freq,
338				host->saved_params.rate);
339	}
340	return 0;
341}
342
343static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
344		spdif_out_resume);
345
346#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
347
348#else
349#define SPDIF_OUT_DEV_PM_OPS NULL
350
351#endif
352
353static struct platform_driver spdif_out_driver = {
354	.probe		= spdif_out_probe,
355	.driver		= {
356		.name	= "spdif-out",
357		.pm	= SPDIF_OUT_DEV_PM_OPS,
358	},
359};
360
361module_platform_driver(spdif_out_driver);
362
363MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
364MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
365MODULE_LICENSE("GPL");
366MODULE_ALIAS("platform:spdif_out");
367