xref: /linux/sound/soc/img/img-i2s-in.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * IMG I2S input controller driver
4  *
5  * Copyright (C) 2015 Imagination Technologies Ltd.
6  *
7  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
8  */
9 
10 #include <linux/clk.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/reset.h>
18 
19 #include <sound/core.h>
20 #include <sound/dmaengine_pcm.h>
21 #include <sound/initval.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 
26 #define IMG_I2S_IN_RX_FIFO			0x0
27 
28 #define IMG_I2S_IN_CTL				0x4
29 #define IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK		0xfffffffc
30 #define IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT		2
31 #define IMG_I2S_IN_CTL_16PACK_MASK		BIT(1)
32 #define IMG_I2S_IN_CTL_ME_MASK			BIT(0)
33 
34 #define IMG_I2S_IN_CH_CTL			0x4
35 #define IMG_I2S_IN_CH_CTL_CCDEL_MASK		0x38000
36 #define IMG_I2S_IN_CH_CTL_CCDEL_SHIFT		15
37 #define IMG_I2S_IN_CH_CTL_FEN_MASK		BIT(14)
38 #define IMG_I2S_IN_CH_CTL_FMODE_MASK		BIT(13)
39 #define IMG_I2S_IN_CH_CTL_16PACK_MASK		BIT(12)
40 #define IMG_I2S_IN_CH_CTL_JUST_MASK		BIT(10)
41 #define IMG_I2S_IN_CH_CTL_PACKH_MASK		BIT(9)
42 #define IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK	BIT(8)
43 #define IMG_I2S_IN_CH_CTL_BLKP_MASK		BIT(7)
44 #define IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK	BIT(6)
45 #define IMG_I2S_IN_CH_CTL_LRD_MASK		BIT(3)
46 #define IMG_I2S_IN_CH_CTL_FW_MASK		BIT(2)
47 #define IMG_I2S_IN_CH_CTL_SW_MASK		BIT(1)
48 #define IMG_I2S_IN_CH_CTL_ME_MASK		BIT(0)
49 
50 #define IMG_I2S_IN_CH_STRIDE			0x20
51 
52 struct img_i2s_in {
53 	void __iomem *base;
54 	struct clk *clk_sys;
55 	struct snd_dmaengine_dai_dma_data dma_data;
56 	struct device *dev;
57 	unsigned int max_i2s_chan;
58 	void __iomem *channel_base;
59 	unsigned int active_channels;
60 	struct snd_soc_dai_driver dai_driver;
61 	u32 suspend_ctl;
62 	u32 *suspend_ch_ctl;
63 };
64 
img_i2s_in_runtime_suspend(struct device * dev)65 static int img_i2s_in_runtime_suspend(struct device *dev)
66 {
67 	struct img_i2s_in *i2s = dev_get_drvdata(dev);
68 
69 	clk_disable_unprepare(i2s->clk_sys);
70 
71 	return 0;
72 }
73 
img_i2s_in_runtime_resume(struct device * dev)74 static int img_i2s_in_runtime_resume(struct device *dev)
75 {
76 	struct img_i2s_in *i2s = dev_get_drvdata(dev);
77 	int ret;
78 
79 	ret = clk_prepare_enable(i2s->clk_sys);
80 	if (ret) {
81 		dev_err(dev, "Unable to enable sys clock\n");
82 		return ret;
83 	}
84 
85 	return 0;
86 }
87 
img_i2s_in_writel(struct img_i2s_in * i2s,u32 val,u32 reg)88 static inline void img_i2s_in_writel(struct img_i2s_in *i2s, u32 val, u32 reg)
89 {
90 	writel(val, i2s->base + reg);
91 }
92 
img_i2s_in_readl(struct img_i2s_in * i2s,u32 reg)93 static inline u32 img_i2s_in_readl(struct img_i2s_in *i2s, u32 reg)
94 {
95 	return readl(i2s->base + reg);
96 }
97 
img_i2s_in_ch_writel(struct img_i2s_in * i2s,u32 chan,u32 val,u32 reg)98 static inline void img_i2s_in_ch_writel(struct img_i2s_in *i2s, u32 chan,
99 					u32 val, u32 reg)
100 {
101 	writel(val, i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
102 }
103 
img_i2s_in_ch_readl(struct img_i2s_in * i2s,u32 chan,u32 reg)104 static inline u32 img_i2s_in_ch_readl(struct img_i2s_in *i2s, u32 chan,
105 					u32 reg)
106 {
107 	return readl(i2s->channel_base + (chan * IMG_I2S_IN_CH_STRIDE) + reg);
108 }
109 
img_i2s_in_ch_disable(struct img_i2s_in * i2s,u32 chan)110 static inline void img_i2s_in_ch_disable(struct img_i2s_in *i2s, u32 chan)
111 {
112 	u32 reg;
113 
114 	reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
115 	reg &= ~IMG_I2S_IN_CH_CTL_ME_MASK;
116 	img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
117 }
118 
img_i2s_in_ch_enable(struct img_i2s_in * i2s,u32 chan)119 static inline void img_i2s_in_ch_enable(struct img_i2s_in *i2s, u32 chan)
120 {
121 	u32 reg;
122 
123 	reg = img_i2s_in_ch_readl(i2s, chan, IMG_I2S_IN_CH_CTL);
124 	reg |= IMG_I2S_IN_CH_CTL_ME_MASK;
125 	img_i2s_in_ch_writel(i2s, chan, reg, IMG_I2S_IN_CH_CTL);
126 }
127 
img_i2s_in_disable(struct img_i2s_in * i2s)128 static inline void img_i2s_in_disable(struct img_i2s_in *i2s)
129 {
130 	u32 reg;
131 
132 	reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
133 	reg &= ~IMG_I2S_IN_CTL_ME_MASK;
134 	img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
135 }
136 
img_i2s_in_enable(struct img_i2s_in * i2s)137 static inline void img_i2s_in_enable(struct img_i2s_in *i2s)
138 {
139 	u32 reg;
140 
141 	reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
142 	reg |= IMG_I2S_IN_CTL_ME_MASK;
143 	img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
144 }
145 
img_i2s_in_flush(struct img_i2s_in * i2s)146 static inline void img_i2s_in_flush(struct img_i2s_in *i2s)
147 {
148 	int i;
149 	u32 reg;
150 
151 	for (i = 0; i < i2s->active_channels; i++) {
152 		reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
153 		reg |= IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
154 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
155 		reg &= ~IMG_I2S_IN_CH_CTL_FIFO_FLUSH_MASK;
156 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
157 	}
158 }
159 
img_i2s_in_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)160 static int img_i2s_in_trigger(struct snd_pcm_substream *substream, int cmd,
161 	struct snd_soc_dai *dai)
162 {
163 	struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
164 
165 	switch (cmd) {
166 	case SNDRV_PCM_TRIGGER_START:
167 	case SNDRV_PCM_TRIGGER_RESUME:
168 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
169 		img_i2s_in_enable(i2s);
170 		break;
171 
172 	case SNDRV_PCM_TRIGGER_STOP:
173 	case SNDRV_PCM_TRIGGER_SUSPEND:
174 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
175 		img_i2s_in_disable(i2s);
176 		break;
177 	default:
178 		return -EINVAL;
179 	}
180 
181 	return 0;
182 }
183 
img_i2s_in_check_rate(struct img_i2s_in * i2s,unsigned int sample_rate,unsigned int frame_size,unsigned int * bclk_filter_enable,unsigned int * bclk_filter_value)184 static int img_i2s_in_check_rate(struct img_i2s_in *i2s,
185 		unsigned int sample_rate, unsigned int frame_size,
186 		unsigned int *bclk_filter_enable,
187 		unsigned int *bclk_filter_value)
188 {
189 	unsigned int bclk_freq, cur_freq;
190 
191 	bclk_freq = sample_rate * frame_size;
192 
193 	cur_freq = clk_get_rate(i2s->clk_sys);
194 
195 	if (cur_freq >= bclk_freq * 8) {
196 		*bclk_filter_enable = 1;
197 		*bclk_filter_value = 0;
198 	} else if (cur_freq >= bclk_freq * 7) {
199 		*bclk_filter_enable = 1;
200 		*bclk_filter_value = 1;
201 	} else if (cur_freq >= bclk_freq * 6) {
202 		*bclk_filter_enable = 0;
203 		*bclk_filter_value = 0;
204 	} else {
205 		dev_err(i2s->dev,
206 			"Sys clock rate %u insufficient for sample rate %u\n",
207 			cur_freq, sample_rate);
208 		return -EINVAL;
209 	}
210 
211 	return 0;
212 }
213 
img_i2s_in_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)214 static int img_i2s_in_hw_params(struct snd_pcm_substream *substream,
215 	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
216 {
217 	struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
218 	unsigned int rate, channels, i2s_channels, frame_size;
219 	unsigned int bclk_filter_enable, bclk_filter_value;
220 	int i, ret = 0;
221 	u32 reg, control_mask, chan_control_mask;
222 	u32 control_set = 0, chan_control_set = 0;
223 	snd_pcm_format_t format;
224 
225 	rate = params_rate(params);
226 	format = params_format(params);
227 	channels = params_channels(params);
228 	i2s_channels = channels / 2;
229 
230 	switch (format) {
231 	case SNDRV_PCM_FORMAT_S32_LE:
232 		frame_size = 64;
233 		chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
234 		chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
235 		chan_control_set |= IMG_I2S_IN_CH_CTL_PACKH_MASK;
236 		break;
237 	case SNDRV_PCM_FORMAT_S24_LE:
238 		frame_size = 64;
239 		chan_control_set |= IMG_I2S_IN_CH_CTL_SW_MASK;
240 		chan_control_set |= IMG_I2S_IN_CH_CTL_FW_MASK;
241 		break;
242 	case SNDRV_PCM_FORMAT_S16_LE:
243 		frame_size = 32;
244 		control_set |= IMG_I2S_IN_CTL_16PACK_MASK;
245 		chan_control_set |= IMG_I2S_IN_CH_CTL_16PACK_MASK;
246 		break;
247 	default:
248 		return -EINVAL;
249 	}
250 
251 	if ((channels < 2) ||
252 	    (channels > (i2s->max_i2s_chan * 2)) ||
253 	    (channels % 2))
254 		return -EINVAL;
255 
256 	control_set |= ((i2s_channels - 1) << IMG_I2S_IN_CTL_ACTIVE_CH_SHIFT);
257 
258 	ret = img_i2s_in_check_rate(i2s, rate, frame_size,
259 			&bclk_filter_enable, &bclk_filter_value);
260 	if (ret < 0)
261 		return ret;
262 
263 	if (bclk_filter_enable)
264 		chan_control_set |= IMG_I2S_IN_CH_CTL_FEN_MASK;
265 
266 	if (bclk_filter_value)
267 		chan_control_set |= IMG_I2S_IN_CH_CTL_FMODE_MASK;
268 
269 	control_mask = IMG_I2S_IN_CTL_16PACK_MASK |
270 		       IMG_I2S_IN_CTL_ACTIVE_CHAN_MASK;
271 
272 	chan_control_mask = IMG_I2S_IN_CH_CTL_16PACK_MASK |
273 			    IMG_I2S_IN_CH_CTL_FEN_MASK |
274 			    IMG_I2S_IN_CH_CTL_FMODE_MASK |
275 			    IMG_I2S_IN_CH_CTL_SW_MASK |
276 			    IMG_I2S_IN_CH_CTL_FW_MASK |
277 			    IMG_I2S_IN_CH_CTL_PACKH_MASK;
278 
279 	reg = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
280 	reg = (reg & ~control_mask) | control_set;
281 	img_i2s_in_writel(i2s, reg, IMG_I2S_IN_CTL);
282 
283 	for (i = 0; i < i2s->active_channels; i++)
284 		img_i2s_in_ch_disable(i2s, i);
285 
286 	for (i = 0; i < i2s->max_i2s_chan; i++) {
287 		reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
288 		reg = (reg & ~chan_control_mask) | chan_control_set;
289 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
290 	}
291 
292 	i2s->active_channels = i2s_channels;
293 
294 	img_i2s_in_flush(i2s);
295 
296 	for (i = 0; i < i2s->active_channels; i++)
297 		img_i2s_in_ch_enable(i2s, i);
298 
299 	return 0;
300 }
301 
img_i2s_in_set_fmt(struct snd_soc_dai * dai,unsigned int fmt)302 static int img_i2s_in_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
303 {
304 	struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
305 	int i, ret;
306 	u32 chan_control_mask, lrd_set = 0, blkp_set = 0, chan_control_set = 0;
307 	u32 reg;
308 
309 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
310 	case SND_SOC_DAIFMT_NB_NF:
311 		lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
312 		break;
313 	case SND_SOC_DAIFMT_NB_IF:
314 		break;
315 	case SND_SOC_DAIFMT_IB_NF:
316 		lrd_set |= IMG_I2S_IN_CH_CTL_LRD_MASK;
317 		blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
318 		break;
319 	case SND_SOC_DAIFMT_IB_IF:
320 		blkp_set |= IMG_I2S_IN_CH_CTL_BLKP_MASK;
321 		break;
322 	default:
323 		return -EINVAL;
324 	}
325 
326 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
327 	case SND_SOC_DAIFMT_I2S:
328 		chan_control_set |= IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
329 		break;
330 	case SND_SOC_DAIFMT_LEFT_J:
331 		break;
332 	default:
333 		return -EINVAL;
334 	}
335 
336 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
337 	case SND_SOC_DAIFMT_BC_FC:
338 		break;
339 	default:
340 		return -EINVAL;
341 	}
342 
343 	chan_control_mask = IMG_I2S_IN_CH_CTL_CLK_TRANS_MASK;
344 
345 	ret = pm_runtime_resume_and_get(i2s->dev);
346 	if (ret < 0)
347 		return ret;
348 
349 	for (i = 0; i < i2s->active_channels; i++)
350 		img_i2s_in_ch_disable(i2s, i);
351 
352 	/*
353 	 * BLKP and LRD must be set during separate register writes
354 	 */
355 	for (i = 0; i < i2s->max_i2s_chan; i++) {
356 		reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
357 		reg = (reg & ~chan_control_mask) | chan_control_set;
358 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
359 		reg = (reg & ~IMG_I2S_IN_CH_CTL_BLKP_MASK) | blkp_set;
360 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
361 		reg = (reg & ~IMG_I2S_IN_CH_CTL_LRD_MASK) | lrd_set;
362 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
363 	}
364 
365 	for (i = 0; i < i2s->active_channels; i++)
366 		img_i2s_in_ch_enable(i2s, i);
367 
368 	pm_runtime_put(i2s->dev);
369 
370 	return 0;
371 }
372 
img_i2s_in_dai_probe(struct snd_soc_dai * dai)373 static int img_i2s_in_dai_probe(struct snd_soc_dai *dai)
374 {
375 	struct img_i2s_in *i2s = snd_soc_dai_get_drvdata(dai);
376 
377 	snd_soc_dai_init_dma_data(dai, NULL, &i2s->dma_data);
378 
379 	return 0;
380 }
381 
382 static const struct snd_soc_dai_ops img_i2s_in_dai_ops = {
383 	.probe		= img_i2s_in_dai_probe,
384 	.trigger	= img_i2s_in_trigger,
385 	.hw_params	= img_i2s_in_hw_params,
386 	.set_fmt	= img_i2s_in_set_fmt
387 };
388 
389 static const struct snd_soc_component_driver img_i2s_in_component = {
390 	.name = "img-i2s-in",
391 	.legacy_dai_naming = 1,
392 };
393 
img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream * st,struct snd_pcm_hw_params * params,struct dma_slave_config * sc)394 static int img_i2s_in_dma_prepare_slave_config(struct snd_pcm_substream *st,
395 	struct snd_pcm_hw_params *params, struct dma_slave_config *sc)
396 {
397 	unsigned int i2s_channels = params_channels(params) / 2;
398 	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(st);
399 	struct snd_dmaengine_dai_dma_data *dma_data;
400 	int ret;
401 
402 	dma_data = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), st);
403 
404 	ret = snd_hwparams_to_dma_slave_config(st, params, sc);
405 	if (ret)
406 		return ret;
407 
408 	sc->src_addr = dma_data->addr;
409 	sc->src_addr_width = dma_data->addr_width;
410 	sc->src_maxburst = 4 * i2s_channels;
411 
412 	return 0;
413 }
414 
415 static const struct snd_dmaengine_pcm_config img_i2s_in_dma_config = {
416 	.prepare_slave_config = img_i2s_in_dma_prepare_slave_config
417 };
418 
img_i2s_in_probe(struct platform_device * pdev)419 static int img_i2s_in_probe(struct platform_device *pdev)
420 {
421 	struct img_i2s_in *i2s;
422 	struct resource *res;
423 	void __iomem *base;
424 	int ret, i;
425 	struct reset_control *rst;
426 	unsigned int max_i2s_chan_pow_2;
427 	struct device *dev = &pdev->dev;
428 
429 	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
430 	if (!i2s)
431 		return -ENOMEM;
432 
433 	platform_set_drvdata(pdev, i2s);
434 
435 	i2s->dev = dev;
436 
437 	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
438 	if (IS_ERR(base))
439 		return PTR_ERR(base);
440 
441 	i2s->base = base;
442 
443 	if (of_property_read_u32(pdev->dev.of_node, "img,i2s-channels",
444 			&i2s->max_i2s_chan)) {
445 		dev_err(dev, "No img,i2s-channels property\n");
446 		return -EINVAL;
447 	}
448 
449 	max_i2s_chan_pow_2 = 1 << get_count_order(i2s->max_i2s_chan);
450 
451 	i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20);
452 
453 	i2s->clk_sys = devm_clk_get(dev, "sys");
454 	if (IS_ERR(i2s->clk_sys))
455 		return dev_err_probe(dev, PTR_ERR(i2s->clk_sys),
456 				     "Failed to acquire clock 'sys'\n");
457 
458 	pm_runtime_enable(&pdev->dev);
459 	if (!pm_runtime_enabled(&pdev->dev)) {
460 		ret = img_i2s_in_runtime_resume(&pdev->dev);
461 		if (ret)
462 			goto err_pm_disable;
463 	}
464 	ret = pm_runtime_resume_and_get(&pdev->dev);
465 	if (ret < 0)
466 		goto err_suspend;
467 
468 	i2s->active_channels = 1;
469 	i2s->dma_data.addr = res->start + IMG_I2S_IN_RX_FIFO;
470 	i2s->dma_data.addr_width = 4;
471 
472 	i2s->dai_driver.capture.channels_min = 2;
473 	i2s->dai_driver.capture.channels_max = i2s->max_i2s_chan * 2;
474 	i2s->dai_driver.capture.rates = SNDRV_PCM_RATE_8000_192000;
475 	i2s->dai_driver.capture.formats = SNDRV_PCM_FMTBIT_S32_LE |
476 		SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE;
477 	i2s->dai_driver.ops = &img_i2s_in_dai_ops;
478 
479 	rst = devm_reset_control_get_exclusive(dev, "rst");
480 	if (IS_ERR(rst)) {
481 		if (PTR_ERR(rst) == -EPROBE_DEFER) {
482 			ret = -EPROBE_DEFER;
483 			pm_runtime_put(&pdev->dev);
484 			goto err_suspend;
485 		}
486 
487 		dev_dbg(dev, "No top level reset found\n");
488 
489 		img_i2s_in_disable(i2s);
490 
491 		for (i = 0; i < i2s->max_i2s_chan; i++)
492 			img_i2s_in_ch_disable(i2s, i);
493 	} else {
494 		reset_control_assert(rst);
495 		reset_control_deassert(rst);
496 	}
497 
498 	img_i2s_in_writel(i2s, 0, IMG_I2S_IN_CTL);
499 
500 	for (i = 0; i < i2s->max_i2s_chan; i++)
501 		img_i2s_in_ch_writel(i2s, i,
502 			(4 << IMG_I2S_IN_CH_CTL_CCDEL_SHIFT) |
503 			IMG_I2S_IN_CH_CTL_JUST_MASK |
504 			IMG_I2S_IN_CH_CTL_FW_MASK, IMG_I2S_IN_CH_CTL);
505 
506 	pm_runtime_put(&pdev->dev);
507 
508 	i2s->suspend_ch_ctl = devm_kcalloc(dev,
509 		i2s->max_i2s_chan, sizeof(*i2s->suspend_ch_ctl), GFP_KERNEL);
510 	if (!i2s->suspend_ch_ctl) {
511 		ret = -ENOMEM;
512 		goto err_suspend;
513 	}
514 
515 	ret = devm_snd_soc_register_component(dev, &img_i2s_in_component,
516 						&i2s->dai_driver, 1);
517 	if (ret)
518 		goto err_suspend;
519 
520 	ret = devm_snd_dmaengine_pcm_register(dev, &img_i2s_in_dma_config, 0);
521 	if (ret)
522 		goto err_suspend;
523 
524 	return 0;
525 
526 err_suspend:
527 	if (!pm_runtime_enabled(&pdev->dev))
528 		img_i2s_in_runtime_suspend(&pdev->dev);
529 err_pm_disable:
530 	pm_runtime_disable(&pdev->dev);
531 
532 	return ret;
533 }
534 
img_i2s_in_dev_remove(struct platform_device * pdev)535 static void img_i2s_in_dev_remove(struct platform_device *pdev)
536 {
537 	pm_runtime_disable(&pdev->dev);
538 	if (!pm_runtime_status_suspended(&pdev->dev))
539 		img_i2s_in_runtime_suspend(&pdev->dev);
540 }
541 
542 #ifdef CONFIG_PM_SLEEP
img_i2s_in_suspend(struct device * dev)543 static int img_i2s_in_suspend(struct device *dev)
544 {
545 	struct img_i2s_in *i2s = dev_get_drvdata(dev);
546 	int i, ret;
547 	u32 reg;
548 
549 	if (pm_runtime_status_suspended(dev)) {
550 		ret = img_i2s_in_runtime_resume(dev);
551 		if (ret)
552 			return ret;
553 	}
554 
555 	for (i = 0; i < i2s->max_i2s_chan; i++) {
556 		reg = img_i2s_in_ch_readl(i2s, i, IMG_I2S_IN_CH_CTL);
557 		i2s->suspend_ch_ctl[i] = reg;
558 	}
559 
560 	i2s->suspend_ctl = img_i2s_in_readl(i2s, IMG_I2S_IN_CTL);
561 
562 	img_i2s_in_runtime_suspend(dev);
563 
564 	return 0;
565 }
566 
img_i2s_in_resume(struct device * dev)567 static int img_i2s_in_resume(struct device *dev)
568 {
569 	struct img_i2s_in *i2s = dev_get_drvdata(dev);
570 	int i, ret;
571 	u32 reg;
572 
573 	ret = img_i2s_in_runtime_resume(dev);
574 	if (ret)
575 		return ret;
576 
577 	for (i = 0; i < i2s->max_i2s_chan; i++) {
578 		reg = i2s->suspend_ch_ctl[i];
579 		img_i2s_in_ch_writel(i2s, i, reg, IMG_I2S_IN_CH_CTL);
580 	}
581 
582 	img_i2s_in_writel(i2s, i2s->suspend_ctl, IMG_I2S_IN_CTL);
583 
584 	if (pm_runtime_status_suspended(dev))
585 		img_i2s_in_runtime_suspend(dev);
586 
587 	return 0;
588 }
589 #endif
590 
591 static const struct of_device_id img_i2s_in_of_match[] = {
592 	{ .compatible = "img,i2s-in" },
593 	{}
594 };
595 MODULE_DEVICE_TABLE(of, img_i2s_in_of_match);
596 
597 static const struct dev_pm_ops img_i2s_in_pm_ops = {
598 	SET_RUNTIME_PM_OPS(img_i2s_in_runtime_suspend,
599 			   img_i2s_in_runtime_resume, NULL)
600 	SET_SYSTEM_SLEEP_PM_OPS(img_i2s_in_suspend, img_i2s_in_resume)
601 };
602 
603 static struct platform_driver img_i2s_in_driver = {
604 	.driver = {
605 		.name = "img-i2s-in",
606 		.of_match_table = img_i2s_in_of_match,
607 		.pm = &img_i2s_in_pm_ops
608 	},
609 	.probe = img_i2s_in_probe,
610 	.remove = img_i2s_in_dev_remove
611 };
612 module_platform_driver(img_i2s_in_driver);
613 
614 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
615 MODULE_DESCRIPTION("IMG I2S Input Driver");
616 MODULE_LICENSE("GPL v2");
617