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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * rt5514-spi.c -- RT5514 SPI driver
4 *
5 * Copyright 2015 Realtek Semiconductor Corp.
6 * Author: Oder Chiou <oder_chiou@realtek.com>
7 */
8
9#include <linux/module.h>
10#include <linux/input.h>
11#include <linux/spi/spi.h>
12#include <linux/device.h>
13#include <linux/init.h>
14#include <linux/delay.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <linux/slab.h>
18#include <linux/sched.h>
19#include <linux/uaccess.h>
20#include <linux/regulator/consumer.h>
21#include <linux/pm_qos.h>
22#include <linux/sysfs.h>
23#include <linux/clk.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/pcm_params.h>
27#include <sound/soc.h>
28#include <sound/soc-dapm.h>
29#include <sound/initval.h>
30#include <sound/tlv.h>
31
32#include "rt5514-spi.h"
33
34#define DRV_NAME "rt5514-spi"
35
36static struct spi_device *rt5514_spi;
37
38struct rt5514_dsp {
39 struct device *dev;
40 struct delayed_work copy_work;
41 struct mutex dma_lock;
42 struct snd_pcm_substream *substream;
43 unsigned int buf_base, buf_limit, buf_rp;
44 size_t buf_size, get_size, dma_offset;
45};
46
47static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
48 .info = SNDRV_PCM_INFO_MMAP |
49 SNDRV_PCM_INFO_MMAP_VALID |
50 SNDRV_PCM_INFO_INTERLEAVED,
51 .formats = SNDRV_PCM_FMTBIT_S16_LE,
52 .period_bytes_min = PAGE_SIZE,
53 .period_bytes_max = 0x20000 / 8,
54 .periods_min = 8,
55 .periods_max = 8,
56 .channels_min = 1,
57 .channels_max = 1,
58 .buffer_bytes_max = 0x20000,
59};
60
61static struct snd_soc_dai_driver rt5514_spi_dai = {
62 .name = "rt5514-dsp-cpu-dai",
63 .id = 0,
64 .capture = {
65 .stream_name = "DSP Capture",
66 .channels_min = 1,
67 .channels_max = 1,
68 .rates = SNDRV_PCM_RATE_16000,
69 .formats = SNDRV_PCM_FMTBIT_S16_LE,
70 },
71};
72
73static void rt5514_spi_copy_work(struct work_struct *work)
74{
75 struct rt5514_dsp *rt5514_dsp =
76 container_of(work, struct rt5514_dsp, copy_work.work);
77 struct snd_pcm_runtime *runtime;
78 size_t period_bytes, truncated_bytes = 0;
79 unsigned int cur_wp, remain_data;
80 u8 buf[8];
81
82 mutex_lock(&rt5514_dsp->dma_lock);
83 if (!rt5514_dsp->substream) {
84 dev_err(rt5514_dsp->dev, "No pcm substream\n");
85 goto done;
86 }
87
88 runtime = rt5514_dsp->substream->runtime;
89 period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
90 if (!period_bytes) {
91 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
92 goto done;
93 }
94
95 if (rt5514_dsp->buf_size % period_bytes)
96 rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
97 period_bytes;
98
99 if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
100 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
101 sizeof(buf));
102 cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
103 buf[3] << 24;
104
105 if (cur_wp >= rt5514_dsp->buf_rp)
106 remain_data = (cur_wp - rt5514_dsp->buf_rp);
107 else
108 remain_data =
109 (rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
110 (cur_wp - rt5514_dsp->buf_base);
111
112 if (remain_data < period_bytes) {
113 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
114 goto done;
115 }
116 }
117
118 if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
119 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
120 runtime->dma_area + rt5514_dsp->dma_offset,
121 period_bytes);
122
123 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
124 rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
125 else
126 rt5514_dsp->buf_rp += period_bytes;
127 } else {
128 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
129 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
130 runtime->dma_area + rt5514_dsp->dma_offset,
131 truncated_bytes);
132
133 rt5514_spi_burst_read(rt5514_dsp->buf_base,
134 runtime->dma_area + rt5514_dsp->dma_offset +
135 truncated_bytes, period_bytes - truncated_bytes);
136
137 rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
138 truncated_bytes;
139 }
140
141 rt5514_dsp->get_size += period_bytes;
142 rt5514_dsp->dma_offset += period_bytes;
143 if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
144 rt5514_dsp->dma_offset = 0;
145
146 snd_pcm_period_elapsed(rt5514_dsp->substream);
147
148 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
149
150done:
151 mutex_unlock(&rt5514_dsp->dma_lock);
152}
153
154static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
155{
156 u8 buf[8];
157
158 if (!rt5514_dsp->substream)
159 return;
160
161 rt5514_dsp->get_size = 0;
162
163 /**
164 * The address area x1800XXXX is the register address, and it cannot
165 * support spi burst read perfectly. So we use the spi burst read
166 * individually to make sure the data correctly.
167 */
168 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
169 sizeof(buf));
170 rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
171 buf[3] << 24;
172
173 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
174 sizeof(buf));
175 rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
176 buf[3] << 24;
177
178 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
179 sizeof(buf));
180 rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
181 buf[3] << 24;
182
183 if (rt5514_dsp->buf_rp % 8)
184 rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
185
186 rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
187
188 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
189 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
190 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
191}
192
193static irqreturn_t rt5514_spi_irq(int irq, void *data)
194{
195 struct rt5514_dsp *rt5514_dsp = data;
196
197 rt5514_schedule_copy(rt5514_dsp);
198
199 return IRQ_HANDLED;
200}
201
202/* PCM for streaming audio from the DSP buffer */
203static int rt5514_spi_pcm_open(struct snd_soc_component *component,
204 struct snd_pcm_substream *substream)
205{
206 snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
207
208 return 0;
209}
210
211static int rt5514_spi_hw_params(struct snd_soc_component *component,
212 struct snd_pcm_substream *substream,
213 struct snd_pcm_hw_params *hw_params)
214{
215 struct rt5514_dsp *rt5514_dsp =
216 snd_soc_component_get_drvdata(component);
217 u8 buf[8];
218
219 mutex_lock(&rt5514_dsp->dma_lock);
220 rt5514_dsp->substream = substream;
221 rt5514_dsp->dma_offset = 0;
222
223 /* Read IRQ status and schedule copy accordingly. */
224 rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
225 if (buf[0] & RT5514_IRQ_STATUS_BIT)
226 rt5514_schedule_copy(rt5514_dsp);
227
228 mutex_unlock(&rt5514_dsp->dma_lock);
229
230 return 0;
231}
232
233static int rt5514_spi_hw_free(struct snd_soc_component *component,
234 struct snd_pcm_substream *substream)
235{
236 struct rt5514_dsp *rt5514_dsp =
237 snd_soc_component_get_drvdata(component);
238
239 mutex_lock(&rt5514_dsp->dma_lock);
240 rt5514_dsp->substream = NULL;
241 mutex_unlock(&rt5514_dsp->dma_lock);
242
243 cancel_delayed_work_sync(&rt5514_dsp->copy_work);
244
245 return 0;
246}
247
248static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
249 struct snd_soc_component *component,
250 struct snd_pcm_substream *substream)
251{
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 struct rt5514_dsp *rt5514_dsp =
254 snd_soc_component_get_drvdata(component);
255
256 return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
257}
258
259
260static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
261{
262 struct rt5514_dsp *rt5514_dsp;
263 int ret;
264
265 rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
266 GFP_KERNEL);
267 if (!rt5514_dsp)
268 return -ENOMEM;
269
270 rt5514_dsp->dev = &rt5514_spi->dev;
271 mutex_init(&rt5514_dsp->dma_lock);
272 INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
273 snd_soc_component_set_drvdata(component, rt5514_dsp);
274
275 if (rt5514_spi->irq) {
276 ret = devm_request_threaded_irq(&rt5514_spi->dev,
277 rt5514_spi->irq, NULL, rt5514_spi_irq,
278 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
279 rt5514_dsp);
280 if (ret)
281 dev_err(&rt5514_spi->dev,
282 "%s Failed to request IRQ: %d\n", __func__,
283 ret);
284 else
285 device_init_wakeup(rt5514_dsp->dev, true);
286 }
287
288 return 0;
289}
290
291static int rt5514_spi_pcm_new(struct snd_soc_component *component,
292 struct snd_soc_pcm_runtime *rtd)
293{
294 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
295 NULL, 0, 0);
296 return 0;
297}
298
299static const struct snd_soc_component_driver rt5514_spi_component = {
300 .name = DRV_NAME,
301 .probe = rt5514_spi_pcm_probe,
302 .open = rt5514_spi_pcm_open,
303 .hw_params = rt5514_spi_hw_params,
304 .hw_free = rt5514_spi_hw_free,
305 .pointer = rt5514_spi_pcm_pointer,
306 .pcm_construct = rt5514_spi_pcm_new,
307 .legacy_dai_naming = 1,
308};
309
310/**
311 * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
312 * @addr: Start address.
313 * @rxbuf: Data Buffer for reading.
314 * @len: Data length, it must be a multiple of 8.
315 *
316 *
317 * Returns true for success.
318 */
319int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
320{
321 u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
322 int status;
323 u8 write_buf[8];
324 unsigned int i, end, offset = 0;
325
326 struct spi_message message;
327 struct spi_transfer x[3];
328
329 while (offset < len) {
330 if (offset + RT5514_SPI_BUF_LEN <= len)
331 end = RT5514_SPI_BUF_LEN;
332 else
333 end = len % RT5514_SPI_BUF_LEN;
334
335 write_buf[0] = spi_cmd;
336 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
337 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
338 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
339 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
340
341 spi_message_init(&message);
342 memset(x, 0, sizeof(x));
343
344 x[0].len = 5;
345 x[0].tx_buf = write_buf;
346 spi_message_add_tail(&x[0], &message);
347
348 x[1].len = 4;
349 x[1].tx_buf = write_buf;
350 spi_message_add_tail(&x[1], &message);
351
352 x[2].len = end;
353 x[2].rx_buf = rxbuf + offset;
354 spi_message_add_tail(&x[2], &message);
355
356 status = spi_sync(rt5514_spi, &message);
357
358 if (status)
359 return false;
360
361 offset += RT5514_SPI_BUF_LEN;
362 }
363
364 for (i = 0; i < len; i += 8) {
365 write_buf[0] = rxbuf[i + 0];
366 write_buf[1] = rxbuf[i + 1];
367 write_buf[2] = rxbuf[i + 2];
368 write_buf[3] = rxbuf[i + 3];
369 write_buf[4] = rxbuf[i + 4];
370 write_buf[5] = rxbuf[i + 5];
371 write_buf[6] = rxbuf[i + 6];
372 write_buf[7] = rxbuf[i + 7];
373
374 rxbuf[i + 0] = write_buf[7];
375 rxbuf[i + 1] = write_buf[6];
376 rxbuf[i + 2] = write_buf[5];
377 rxbuf[i + 3] = write_buf[4];
378 rxbuf[i + 4] = write_buf[3];
379 rxbuf[i + 5] = write_buf[2];
380 rxbuf[i + 6] = write_buf[1];
381 rxbuf[i + 7] = write_buf[0];
382 }
383
384 return true;
385}
386EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
387
388/**
389 * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
390 * @addr: Start address.
391 * @txbuf: Data Buffer for writng.
392 * @len: Data length, it must be a multiple of 8.
393 *
394 *
395 * Returns true for success.
396 */
397int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
398{
399 u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
400 u8 *write_buf;
401 unsigned int i, end, offset = 0;
402
403 write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
404
405 if (write_buf == NULL)
406 return -ENOMEM;
407
408 while (offset < len) {
409 if (offset + RT5514_SPI_BUF_LEN <= len)
410 end = RT5514_SPI_BUF_LEN;
411 else
412 end = len % RT5514_SPI_BUF_LEN;
413
414 write_buf[0] = spi_cmd;
415 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
416 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
417 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
418 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
419
420 for (i = 0; i < end; i += 8) {
421 write_buf[i + 12] = txbuf[offset + i + 0];
422 write_buf[i + 11] = txbuf[offset + i + 1];
423 write_buf[i + 10] = txbuf[offset + i + 2];
424 write_buf[i + 9] = txbuf[offset + i + 3];
425 write_buf[i + 8] = txbuf[offset + i + 4];
426 write_buf[i + 7] = txbuf[offset + i + 5];
427 write_buf[i + 6] = txbuf[offset + i + 6];
428 write_buf[i + 5] = txbuf[offset + i + 7];
429 }
430
431 write_buf[end + 5] = spi_cmd;
432
433 spi_write(rt5514_spi, write_buf, end + 6);
434
435 offset += RT5514_SPI_BUF_LEN;
436 }
437
438 kfree(write_buf);
439
440 return 0;
441}
442EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
443
444static int rt5514_spi_probe(struct spi_device *spi)
445{
446 int ret;
447
448 rt5514_spi = spi;
449
450 ret = devm_snd_soc_register_component(&spi->dev,
451 &rt5514_spi_component,
452 &rt5514_spi_dai, 1);
453 if (ret < 0) {
454 dev_err(&spi->dev, "Failed to register component.\n");
455 return ret;
456 }
457
458 return 0;
459}
460
461static int __maybe_unused rt5514_suspend(struct device *dev)
462{
463 int irq = to_spi_device(dev)->irq;
464
465 if (device_may_wakeup(dev))
466 enable_irq_wake(irq);
467
468 return 0;
469}
470
471static int __maybe_unused rt5514_resume(struct device *dev)
472{
473 struct rt5514_dsp *rt5514_dsp = dev_get_drvdata(dev);
474 int irq = to_spi_device(dev)->irq;
475 u8 buf[8];
476
477 if (device_may_wakeup(dev))
478 disable_irq_wake(irq);
479
480 if (rt5514_dsp) {
481 if (rt5514_dsp->substream) {
482 rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
483 sizeof(buf));
484 if (buf[0] & RT5514_IRQ_STATUS_BIT)
485 rt5514_schedule_copy(rt5514_dsp);
486 }
487 }
488
489 return 0;
490}
491
492static const struct dev_pm_ops rt5514_pm_ops = {
493 SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
494};
495
496static const struct of_device_id rt5514_of_match[] = {
497 { .compatible = "realtek,rt5514", },
498 {},
499};
500MODULE_DEVICE_TABLE(of, rt5514_of_match);
501
502static struct spi_driver rt5514_spi_driver = {
503 .driver = {
504 .name = "rt5514",
505 .pm = &rt5514_pm_ops,
506 .of_match_table = of_match_ptr(rt5514_of_match),
507 },
508 .probe = rt5514_spi_probe,
509};
510module_spi_driver(rt5514_spi_driver);
511
512MODULE_DESCRIPTION("RT5514 SPI driver");
513MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
514MODULE_LICENSE("GPL v2");
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/miscdevice.h>
25#include <linux/regulator/consumer.h>
26#include <linux/pm_qos.h>
27#include <linux/sysfs.h>
28#include <linux/clk.h>
29#include <sound/core.h>
30#include <sound/pcm.h>
31#include <sound/pcm_params.h>
32#include <sound/soc.h>
33#include <sound/soc-dapm.h>
34#include <sound/initval.h>
35#include <sound/tlv.h>
36
37#include "rt5514-spi.h"
38
39static struct spi_device *rt5514_spi;
40
41struct rt5514_dsp {
42 struct device *dev;
43 struct delayed_work copy_work;
44 struct mutex dma_lock;
45 struct snd_pcm_substream *substream;
46 unsigned int buf_base, buf_limit, buf_rp;
47 size_t buf_size;
48 size_t dma_offset;
49 size_t dsp_offset;
50};
51
52static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
53 .info = SNDRV_PCM_INFO_MMAP |
54 SNDRV_PCM_INFO_MMAP_VALID |
55 SNDRV_PCM_INFO_INTERLEAVED,
56 .formats = SNDRV_PCM_FMTBIT_S16_LE,
57 .period_bytes_min = PAGE_SIZE,
58 .period_bytes_max = 0x20000 / 8,
59 .periods_min = 8,
60 .periods_max = 8,
61 .channels_min = 1,
62 .channels_max = 1,
63 .buffer_bytes_max = 0x20000,
64};
65
66static struct snd_soc_dai_driver rt5514_spi_dai = {
67 .name = "rt5514-dsp-cpu-dai",
68 .id = 0,
69 .capture = {
70 .stream_name = "DSP Capture",
71 .channels_min = 1,
72 .channels_max = 1,
73 .rates = SNDRV_PCM_RATE_16000,
74 .formats = SNDRV_PCM_FMTBIT_S16_LE,
75 },
76};
77
78static void rt5514_spi_copy_work(struct work_struct *work)
79{
80 struct rt5514_dsp *rt5514_dsp =
81 container_of(work, struct rt5514_dsp, copy_work.work);
82 struct snd_pcm_runtime *runtime;
83 size_t period_bytes, truncated_bytes = 0;
84
85 mutex_lock(&rt5514_dsp->dma_lock);
86 if (!rt5514_dsp->substream) {
87 dev_err(rt5514_dsp->dev, "No pcm substream\n");
88 goto done;
89 }
90
91 runtime = rt5514_dsp->substream->runtime;
92 period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
93
94 if (rt5514_dsp->buf_size - rt5514_dsp->dsp_offset < period_bytes)
95 period_bytes = rt5514_dsp->buf_size - rt5514_dsp->dsp_offset;
96
97 if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
98 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
99 runtime->dma_area + rt5514_dsp->dma_offset,
100 period_bytes);
101
102 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
103 rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
104 else
105 rt5514_dsp->buf_rp += period_bytes;
106 } else {
107 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
108 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
109 runtime->dma_area + rt5514_dsp->dma_offset,
110 truncated_bytes);
111
112 rt5514_spi_burst_read(rt5514_dsp->buf_base,
113 runtime->dma_area + rt5514_dsp->dma_offset +
114 truncated_bytes, period_bytes - truncated_bytes);
115
116 rt5514_dsp->buf_rp = rt5514_dsp->buf_base +
117 period_bytes - truncated_bytes;
118 }
119
120 rt5514_dsp->dma_offset += period_bytes;
121 if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
122 rt5514_dsp->dma_offset = 0;
123
124 rt5514_dsp->dsp_offset += period_bytes;
125
126 snd_pcm_period_elapsed(rt5514_dsp->substream);
127
128 if (rt5514_dsp->dsp_offset < rt5514_dsp->buf_size)
129 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
130done:
131 mutex_unlock(&rt5514_dsp->dma_lock);
132}
133
134/* PCM for streaming audio from the DSP buffer */
135static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
136{
137 snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
138
139 return 0;
140}
141
142static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
143 struct snd_pcm_hw_params *hw_params)
144{
145 struct snd_soc_pcm_runtime *rtd = substream->private_data;
146 struct rt5514_dsp *rt5514_dsp =
147 snd_soc_platform_get_drvdata(rtd->platform);
148 int ret;
149
150 mutex_lock(&rt5514_dsp->dma_lock);
151 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
152 params_buffer_bytes(hw_params));
153 rt5514_dsp->substream = substream;
154 mutex_unlock(&rt5514_dsp->dma_lock);
155
156 return ret;
157}
158
159static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
160{
161 struct snd_soc_pcm_runtime *rtd = substream->private_data;
162 struct rt5514_dsp *rt5514_dsp =
163 snd_soc_platform_get_drvdata(rtd->platform);
164
165 mutex_lock(&rt5514_dsp->dma_lock);
166 rt5514_dsp->substream = NULL;
167 mutex_unlock(&rt5514_dsp->dma_lock);
168
169 cancel_delayed_work_sync(&rt5514_dsp->copy_work);
170
171 return snd_pcm_lib_free_vmalloc_buffer(substream);
172}
173
174static int rt5514_spi_prepare(struct snd_pcm_substream *substream)
175{
176 struct snd_soc_pcm_runtime *rtd = substream->private_data;
177 struct rt5514_dsp *rt5514_dsp =
178 snd_soc_platform_get_drvdata(rtd->platform);
179 u8 buf[8];
180
181 rt5514_dsp->dma_offset = 0;
182 rt5514_dsp->dsp_offset = 0;
183
184 /**
185 * The address area x1800XXXX is the register address, and it cannot
186 * support spi burst read perfectly. So we use the spi burst read
187 * individually to make sure the data correctly.
188 */
189 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
190 sizeof(buf));
191 rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
192 buf[3] << 24;
193
194 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
195 sizeof(buf));
196 rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
197 buf[3] << 24;
198
199 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_RP, (u8 *)&buf,
200 sizeof(buf));
201 rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
202 buf[3] << 24;
203
204 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_SIZE, (u8 *)&buf,
205 sizeof(buf));
206 rt5514_dsp->buf_size = buf[0] | buf[1] << 8 | buf[2] << 16 |
207 buf[3] << 24;
208
209 return 0;
210}
211
212static int rt5514_spi_trigger(struct snd_pcm_substream *substream, int cmd)
213{
214 struct snd_soc_pcm_runtime *rtd = substream->private_data;
215 struct rt5514_dsp *rt5514_dsp =
216 snd_soc_platform_get_drvdata(rtd->platform);
217
218 if (cmd == SNDRV_PCM_TRIGGER_START) {
219 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
220 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
221 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
222 }
223
224 return 0;
225}
226
227static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
228 struct snd_pcm_substream *substream)
229{
230 struct snd_pcm_runtime *runtime = substream->runtime;
231 struct snd_soc_pcm_runtime *rtd = substream->private_data;
232 struct rt5514_dsp *rt5514_dsp =
233 snd_soc_platform_get_drvdata(rtd->platform);
234
235 return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
236}
237
238static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
239 .open = rt5514_spi_pcm_open,
240 .hw_params = rt5514_spi_hw_params,
241 .hw_free = rt5514_spi_hw_free,
242 .trigger = rt5514_spi_trigger,
243 .prepare = rt5514_spi_prepare,
244 .pointer = rt5514_spi_pcm_pointer,
245 .mmap = snd_pcm_lib_mmap_vmalloc,
246 .page = snd_pcm_lib_get_vmalloc_page,
247};
248
249static int rt5514_spi_pcm_probe(struct snd_soc_platform *platform)
250{
251 struct rt5514_dsp *rt5514_dsp;
252
253 rt5514_dsp = devm_kzalloc(platform->dev, sizeof(*rt5514_dsp),
254 GFP_KERNEL);
255
256 rt5514_dsp->dev = &rt5514_spi->dev;
257 mutex_init(&rt5514_dsp->dma_lock);
258 INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
259 snd_soc_platform_set_drvdata(platform, rt5514_dsp);
260
261 return 0;
262}
263
264static struct snd_soc_platform_driver rt5514_spi_platform = {
265 .probe = rt5514_spi_pcm_probe,
266 .ops = &rt5514_spi_pcm_ops,
267};
268
269static const struct snd_soc_component_driver rt5514_spi_dai_component = {
270 .name = "rt5514-spi-dai",
271};
272
273/**
274 * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
275 * @addr: Start address.
276 * @rxbuf: Data Buffer for reading.
277 * @len: Data length, it must be a multiple of 8.
278 *
279 *
280 * Returns true for success.
281 */
282int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
283{
284 u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
285 int status;
286 u8 write_buf[8];
287 unsigned int i, end, offset = 0;
288
289 struct spi_message message;
290 struct spi_transfer x[3];
291
292 while (offset < len) {
293 if (offset + RT5514_SPI_BUF_LEN <= len)
294 end = RT5514_SPI_BUF_LEN;
295 else
296 end = len % RT5514_SPI_BUF_LEN;
297
298 write_buf[0] = spi_cmd;
299 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
300 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
301 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
302 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
303
304 spi_message_init(&message);
305 memset(x, 0, sizeof(x));
306
307 x[0].len = 5;
308 x[0].tx_buf = write_buf;
309 spi_message_add_tail(&x[0], &message);
310
311 x[1].len = 4;
312 x[1].tx_buf = write_buf;
313 spi_message_add_tail(&x[1], &message);
314
315 x[2].len = end;
316 x[2].rx_buf = rxbuf + offset;
317 spi_message_add_tail(&x[2], &message);
318
319 status = spi_sync(rt5514_spi, &message);
320
321 if (status)
322 return false;
323
324 offset += RT5514_SPI_BUF_LEN;
325 }
326
327 for (i = 0; i < len; i += 8) {
328 write_buf[0] = rxbuf[i + 0];
329 write_buf[1] = rxbuf[i + 1];
330 write_buf[2] = rxbuf[i + 2];
331 write_buf[3] = rxbuf[i + 3];
332 write_buf[4] = rxbuf[i + 4];
333 write_buf[5] = rxbuf[i + 5];
334 write_buf[6] = rxbuf[i + 6];
335 write_buf[7] = rxbuf[i + 7];
336
337 rxbuf[i + 0] = write_buf[7];
338 rxbuf[i + 1] = write_buf[6];
339 rxbuf[i + 2] = write_buf[5];
340 rxbuf[i + 3] = write_buf[4];
341 rxbuf[i + 4] = write_buf[3];
342 rxbuf[i + 5] = write_buf[2];
343 rxbuf[i + 6] = write_buf[1];
344 rxbuf[i + 7] = write_buf[0];
345 }
346
347 return true;
348}
349
350/**
351 * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
352 * @addr: Start address.
353 * @txbuf: Data Buffer for writng.
354 * @len: Data length, it must be a multiple of 8.
355 *
356 *
357 * Returns true for success.
358 */
359int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
360{
361 u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
362 u8 *write_buf;
363 unsigned int i, end, offset = 0;
364
365 write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
366
367 if (write_buf == NULL)
368 return -ENOMEM;
369
370 while (offset < len) {
371 if (offset + RT5514_SPI_BUF_LEN <= len)
372 end = RT5514_SPI_BUF_LEN;
373 else
374 end = len % RT5514_SPI_BUF_LEN;
375
376 write_buf[0] = spi_cmd;
377 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
378 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
379 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
380 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
381
382 for (i = 0; i < end; i += 8) {
383 write_buf[i + 12] = txbuf[offset + i + 0];
384 write_buf[i + 11] = txbuf[offset + i + 1];
385 write_buf[i + 10] = txbuf[offset + i + 2];
386 write_buf[i + 9] = txbuf[offset + i + 3];
387 write_buf[i + 8] = txbuf[offset + i + 4];
388 write_buf[i + 7] = txbuf[offset + i + 5];
389 write_buf[i + 6] = txbuf[offset + i + 6];
390 write_buf[i + 5] = txbuf[offset + i + 7];
391 }
392
393 write_buf[end + 5] = spi_cmd;
394
395 spi_write(rt5514_spi, write_buf, end + 6);
396
397 offset += RT5514_SPI_BUF_LEN;
398 }
399
400 kfree(write_buf);
401
402 return 0;
403}
404EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
405
406static int rt5514_spi_probe(struct spi_device *spi)
407{
408 int ret;
409
410 rt5514_spi = spi;
411
412 ret = devm_snd_soc_register_platform(&spi->dev, &rt5514_spi_platform);
413 if (ret < 0) {
414 dev_err(&spi->dev, "Failed to register platform.\n");
415 return ret;
416 }
417
418 ret = devm_snd_soc_register_component(&spi->dev,
419 &rt5514_spi_dai_component,
420 &rt5514_spi_dai, 1);
421 if (ret < 0) {
422 dev_err(&spi->dev, "Failed to register component.\n");
423 return ret;
424 }
425
426 return 0;
427}
428
429static const struct of_device_id rt5514_of_match[] = {
430 { .compatible = "realtek,rt5514", },
431 {},
432};
433MODULE_DEVICE_TABLE(of, rt5514_of_match);
434
435static struct spi_driver rt5514_spi_driver = {
436 .driver = {
437 .name = "rt5514",
438 .of_match_table = of_match_ptr(rt5514_of_match),
439 },
440 .probe = rt5514_spi_probe,
441};
442module_spi_driver(rt5514_spi_driver);
443
444MODULE_DESCRIPTION("RT5514 SPI driver");
445MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
446MODULE_LICENSE("GPL v2");