xref: /openbmc/linux/sound/soc/codecs/rt5514-spi.c (revision 31af04cd)
1 /*
2  * rt5514-spi.c  --  RT5514 SPI driver
3  *
4  * Copyright 2015 Realtek Semiconductor Corp.
5  * Author: Oder Chiou <oder_chiou@realtek.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <linux/module.h>
13 #include <linux/input.h>
14 #include <linux/spi/spi.h>
15 #include <linux/device.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/slab.h>
21 #include <linux/gpio.h>
22 #include <linux/sched.h>
23 #include <linux/uaccess.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_qos.h>
26 #include <linux/sysfs.h>
27 #include <linux/clk.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/soc.h>
32 #include <sound/soc-dapm.h>
33 #include <sound/initval.h>
34 #include <sound/tlv.h>
35 
36 #include "rt5514-spi.h"
37 
38 #define DRV_NAME "rt5514-spi"
39 
40 static struct spi_device *rt5514_spi;
41 
42 struct rt5514_dsp {
43 	struct device *dev;
44 	struct delayed_work copy_work;
45 	struct mutex dma_lock;
46 	struct snd_pcm_substream *substream;
47 	unsigned int buf_base, buf_limit, buf_rp;
48 	size_t buf_size, get_size, dma_offset;
49 };
50 
51 static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
52 	.info			= SNDRV_PCM_INFO_MMAP |
53 				  SNDRV_PCM_INFO_MMAP_VALID |
54 				  SNDRV_PCM_INFO_INTERLEAVED,
55 	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
56 	.period_bytes_min	= PAGE_SIZE,
57 	.period_bytes_max	= 0x20000 / 8,
58 	.periods_min		= 8,
59 	.periods_max		= 8,
60 	.channels_min		= 1,
61 	.channels_max		= 1,
62 	.buffer_bytes_max	= 0x20000,
63 };
64 
65 static struct snd_soc_dai_driver rt5514_spi_dai = {
66 	.name = "rt5514-dsp-cpu-dai",
67 	.id = 0,
68 	.capture = {
69 		.stream_name = "DSP Capture",
70 		.channels_min = 1,
71 		.channels_max = 1,
72 		.rates = SNDRV_PCM_RATE_16000,
73 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
74 	},
75 };
76 
77 static void rt5514_spi_copy_work(struct work_struct *work)
78 {
79 	struct rt5514_dsp *rt5514_dsp =
80 		container_of(work, struct rt5514_dsp, copy_work.work);
81 	struct snd_pcm_runtime *runtime;
82 	size_t period_bytes, truncated_bytes = 0;
83 	unsigned int cur_wp, remain_data;
84 	u8 buf[8];
85 
86 	mutex_lock(&rt5514_dsp->dma_lock);
87 	if (!rt5514_dsp->substream) {
88 		dev_err(rt5514_dsp->dev, "No pcm substream\n");
89 		goto done;
90 	}
91 
92 	runtime = rt5514_dsp->substream->runtime;
93 	period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
94 	if (!period_bytes) {
95 		schedule_delayed_work(&rt5514_dsp->copy_work, 5);
96 		goto done;
97 	}
98 
99 	if (rt5514_dsp->buf_size % period_bytes)
100 		rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
101 			period_bytes;
102 
103 	if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
104 		rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
105 			sizeof(buf));
106 		cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
107 					buf[3] << 24;
108 
109 		if (cur_wp >= rt5514_dsp->buf_rp)
110 			remain_data = (cur_wp - rt5514_dsp->buf_rp);
111 		else
112 			remain_data =
113 				(rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
114 				(cur_wp - rt5514_dsp->buf_base);
115 
116 		if (remain_data < period_bytes) {
117 			schedule_delayed_work(&rt5514_dsp->copy_work, 5);
118 			goto done;
119 		}
120 	}
121 
122 	if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
123 		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
124 			runtime->dma_area + rt5514_dsp->dma_offset,
125 			period_bytes);
126 
127 		if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
128 			rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
129 		else
130 			rt5514_dsp->buf_rp += period_bytes;
131 	} else {
132 		truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
133 		rt5514_spi_burst_read(rt5514_dsp->buf_rp,
134 			runtime->dma_area + rt5514_dsp->dma_offset,
135 			truncated_bytes);
136 
137 		rt5514_spi_burst_read(rt5514_dsp->buf_base,
138 			runtime->dma_area + rt5514_dsp->dma_offset +
139 			truncated_bytes, period_bytes - truncated_bytes);
140 
141 		rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
142 			truncated_bytes;
143 	}
144 
145 	rt5514_dsp->get_size += period_bytes;
146 	rt5514_dsp->dma_offset += period_bytes;
147 	if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
148 		rt5514_dsp->dma_offset = 0;
149 
150 	snd_pcm_period_elapsed(rt5514_dsp->substream);
151 
152 	schedule_delayed_work(&rt5514_dsp->copy_work, 5);
153 
154 done:
155 	mutex_unlock(&rt5514_dsp->dma_lock);
156 }
157 
158 static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
159 {
160 	u8 buf[8];
161 
162 	if (!rt5514_dsp->substream)
163 		return;
164 
165 	rt5514_dsp->get_size = 0;
166 
167 	/**
168 	 * The address area x1800XXXX is the register address, and it cannot
169 	 * support spi burst read perfectly. So we use the spi burst read
170 	 * individually to make sure the data correctly.
171 	 */
172 	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
173 		sizeof(buf));
174 	rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
175 				buf[3] << 24;
176 
177 	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
178 		sizeof(buf));
179 	rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
180 				buf[3] << 24;
181 
182 	rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
183 		sizeof(buf));
184 	rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
185 				buf[3] << 24;
186 
187 	if (rt5514_dsp->buf_rp % 8)
188 		rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
189 
190 	rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
191 
192 	if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
193 		rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
194 		schedule_delayed_work(&rt5514_dsp->copy_work, 0);
195 }
196 
197 static irqreturn_t rt5514_spi_irq(int irq, void *data)
198 {
199 	struct rt5514_dsp *rt5514_dsp = data;
200 
201 	rt5514_schedule_copy(rt5514_dsp);
202 
203 	return IRQ_HANDLED;
204 }
205 
206 /* PCM for streaming audio from the DSP buffer */
207 static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
208 {
209 	snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
210 
211 	return 0;
212 }
213 
214 static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
215 			       struct snd_pcm_hw_params *hw_params)
216 {
217 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
218 	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
219 	struct rt5514_dsp *rt5514_dsp =
220 		snd_soc_component_get_drvdata(component);
221 	int ret;
222 	u8 buf[8];
223 
224 	mutex_lock(&rt5514_dsp->dma_lock);
225 	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
226 			params_buffer_bytes(hw_params));
227 	rt5514_dsp->substream = substream;
228 	rt5514_dsp->dma_offset = 0;
229 
230 	/* Read IRQ status and schedule copy accordingly. */
231 	rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
232 	if (buf[0] & RT5514_IRQ_STATUS_BIT)
233 		rt5514_schedule_copy(rt5514_dsp);
234 
235 	mutex_unlock(&rt5514_dsp->dma_lock);
236 
237 	return ret;
238 }
239 
240 static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
241 {
242 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
243 	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
244 	struct rt5514_dsp *rt5514_dsp =
245 		snd_soc_component_get_drvdata(component);
246 
247 	mutex_lock(&rt5514_dsp->dma_lock);
248 	rt5514_dsp->substream = NULL;
249 	mutex_unlock(&rt5514_dsp->dma_lock);
250 
251 	cancel_delayed_work_sync(&rt5514_dsp->copy_work);
252 
253 	return snd_pcm_lib_free_vmalloc_buffer(substream);
254 }
255 
256 static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
257 		struct snd_pcm_substream *substream)
258 {
259 	struct snd_pcm_runtime *runtime = substream->runtime;
260 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
261 	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
262 	struct rt5514_dsp *rt5514_dsp =
263 		snd_soc_component_get_drvdata(component);
264 
265 	return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
266 }
267 
268 static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
269 	.open		= rt5514_spi_pcm_open,
270 	.hw_params	= rt5514_spi_hw_params,
271 	.hw_free	= rt5514_spi_hw_free,
272 	.pointer	= rt5514_spi_pcm_pointer,
273 	.page		= snd_pcm_lib_get_vmalloc_page,
274 };
275 
276 static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
277 {
278 	struct rt5514_dsp *rt5514_dsp;
279 	int ret;
280 
281 	rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
282 			GFP_KERNEL);
283 	if (!rt5514_dsp)
284 		return -ENOMEM;
285 
286 	rt5514_dsp->dev = &rt5514_spi->dev;
287 	mutex_init(&rt5514_dsp->dma_lock);
288 	INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
289 	snd_soc_component_set_drvdata(component, rt5514_dsp);
290 
291 	if (rt5514_spi->irq) {
292 		ret = devm_request_threaded_irq(&rt5514_spi->dev,
293 			rt5514_spi->irq, NULL, rt5514_spi_irq,
294 			IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
295 			rt5514_dsp);
296 		if (ret)
297 			dev_err(&rt5514_spi->dev,
298 				"%s Failed to reguest IRQ: %d\n", __func__,
299 				ret);
300 		else
301 			device_init_wakeup(rt5514_dsp->dev, true);
302 	}
303 
304 	return 0;
305 }
306 
307 static const struct snd_soc_component_driver rt5514_spi_component = {
308 	.name  = DRV_NAME,
309 	.probe = rt5514_spi_pcm_probe,
310 	.ops = &rt5514_spi_pcm_ops,
311 };
312 
313 /**
314  * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
315  * @addr: Start address.
316  * @rxbuf: Data Buffer for reading.
317  * @len: Data length, it must be a multiple of 8.
318  *
319  *
320  * Returns true for success.
321  */
322 int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
323 {
324 	u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
325 	int status;
326 	u8 write_buf[8];
327 	unsigned int i, end, offset = 0;
328 
329 	struct spi_message message;
330 	struct spi_transfer x[3];
331 
332 	while (offset < len) {
333 		if (offset + RT5514_SPI_BUF_LEN <= len)
334 			end = RT5514_SPI_BUF_LEN;
335 		else
336 			end = len % RT5514_SPI_BUF_LEN;
337 
338 		write_buf[0] = spi_cmd;
339 		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
340 		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
341 		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
342 		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
343 
344 		spi_message_init(&message);
345 		memset(x, 0, sizeof(x));
346 
347 		x[0].len = 5;
348 		x[0].tx_buf = write_buf;
349 		spi_message_add_tail(&x[0], &message);
350 
351 		x[1].len = 4;
352 		x[1].tx_buf = write_buf;
353 		spi_message_add_tail(&x[1], &message);
354 
355 		x[2].len = end;
356 		x[2].rx_buf = rxbuf + offset;
357 		spi_message_add_tail(&x[2], &message);
358 
359 		status = spi_sync(rt5514_spi, &message);
360 
361 		if (status)
362 			return false;
363 
364 		offset += RT5514_SPI_BUF_LEN;
365 	}
366 
367 	for (i = 0; i < len; i += 8) {
368 		write_buf[0] = rxbuf[i + 0];
369 		write_buf[1] = rxbuf[i + 1];
370 		write_buf[2] = rxbuf[i + 2];
371 		write_buf[3] = rxbuf[i + 3];
372 		write_buf[4] = rxbuf[i + 4];
373 		write_buf[5] = rxbuf[i + 5];
374 		write_buf[6] = rxbuf[i + 6];
375 		write_buf[7] = rxbuf[i + 7];
376 
377 		rxbuf[i + 0] = write_buf[7];
378 		rxbuf[i + 1] = write_buf[6];
379 		rxbuf[i + 2] = write_buf[5];
380 		rxbuf[i + 3] = write_buf[4];
381 		rxbuf[i + 4] = write_buf[3];
382 		rxbuf[i + 5] = write_buf[2];
383 		rxbuf[i + 6] = write_buf[1];
384 		rxbuf[i + 7] = write_buf[0];
385 	}
386 
387 	return true;
388 }
389 EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
390 
391 /**
392  * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
393  * @addr: Start address.
394  * @txbuf: Data Buffer for writng.
395  * @len: Data length, it must be a multiple of 8.
396  *
397  *
398  * Returns true for success.
399  */
400 int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
401 {
402 	u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
403 	u8 *write_buf;
404 	unsigned int i, end, offset = 0;
405 
406 	write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
407 
408 	if (write_buf == NULL)
409 		return -ENOMEM;
410 
411 	while (offset < len) {
412 		if (offset + RT5514_SPI_BUF_LEN <= len)
413 			end = RT5514_SPI_BUF_LEN;
414 		else
415 			end = len % RT5514_SPI_BUF_LEN;
416 
417 		write_buf[0] = spi_cmd;
418 		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
419 		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
420 		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
421 		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
422 
423 		for (i = 0; i < end; i += 8) {
424 			write_buf[i + 12] = txbuf[offset + i + 0];
425 			write_buf[i + 11] = txbuf[offset + i + 1];
426 			write_buf[i + 10] = txbuf[offset + i + 2];
427 			write_buf[i +  9] = txbuf[offset + i + 3];
428 			write_buf[i +  8] = txbuf[offset + i + 4];
429 			write_buf[i +  7] = txbuf[offset + i + 5];
430 			write_buf[i +  6] = txbuf[offset + i + 6];
431 			write_buf[i +  5] = txbuf[offset + i + 7];
432 		}
433 
434 		write_buf[end + 5] = spi_cmd;
435 
436 		spi_write(rt5514_spi, write_buf, end + 6);
437 
438 		offset += RT5514_SPI_BUF_LEN;
439 	}
440 
441 	kfree(write_buf);
442 
443 	return 0;
444 }
445 EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
446 
447 static int rt5514_spi_probe(struct spi_device *spi)
448 {
449 	int ret;
450 
451 	rt5514_spi = spi;
452 
453 	ret = devm_snd_soc_register_component(&spi->dev,
454 					      &rt5514_spi_component,
455 					      &rt5514_spi_dai, 1);
456 	if (ret < 0) {
457 		dev_err(&spi->dev, "Failed to register component.\n");
458 		return ret;
459 	}
460 
461 	return 0;
462 }
463 
464 static int __maybe_unused rt5514_suspend(struct device *dev)
465 {
466 	int irq = to_spi_device(dev)->irq;
467 
468 	if (device_may_wakeup(dev))
469 		enable_irq_wake(irq);
470 
471 	return 0;
472 }
473 
474 static int __maybe_unused rt5514_resume(struct device *dev)
475 {
476 	struct snd_soc_component *component = snd_soc_lookup_component(dev, DRV_NAME);
477 	struct rt5514_dsp *rt5514_dsp =
478 		snd_soc_component_get_drvdata(component);
479 	int irq = to_spi_device(dev)->irq;
480 	u8 buf[8];
481 
482 	if (device_may_wakeup(dev))
483 		disable_irq_wake(irq);
484 
485 	if (rt5514_dsp) {
486 		if (rt5514_dsp->substream) {
487 			rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
488 				sizeof(buf));
489 			if (buf[0] & RT5514_IRQ_STATUS_BIT)
490 				rt5514_schedule_copy(rt5514_dsp);
491 		}
492 	}
493 
494 	return 0;
495 }
496 
497 static const struct dev_pm_ops rt5514_pm_ops = {
498 	SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
499 };
500 
501 static const struct of_device_id rt5514_of_match[] = {
502 	{ .compatible = "realtek,rt5514", },
503 	{},
504 };
505 MODULE_DEVICE_TABLE(of, rt5514_of_match);
506 
507 static struct spi_driver rt5514_spi_driver = {
508 	.driver = {
509 		.name = "rt5514",
510 		.pm = &rt5514_pm_ops,
511 		.of_match_table = of_match_ptr(rt5514_of_match),
512 	},
513 	.probe = rt5514_spi_probe,
514 };
515 module_spi_driver(rt5514_spi_driver);
516 
517 MODULE_DESCRIPTION("RT5514 SPI driver");
518 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
519 MODULE_LICENSE("GPL v2");
520