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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// 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/gpio.h>
19#include <linux/sched.h>
20#include <linux/uaccess.h>
21#include <linux/regulator/consumer.h>
22#include <linux/pm_qos.h>
23#include <linux/sysfs.h>
24#include <linux/clk.h>
25#include <sound/core.h>
26#include <sound/pcm.h>
27#include <sound/pcm_params.h>
28#include <sound/soc.h>
29#include <sound/soc-dapm.h>
30#include <sound/initval.h>
31#include <sound/tlv.h>
32
33#include "rt5514-spi.h"
34
35#define DRV_NAME "rt5514-spi"
36
37static struct spi_device *rt5514_spi;
38
39struct rt5514_dsp {
40 struct device *dev;
41 struct delayed_work copy_work;
42 struct mutex dma_lock;
43 struct snd_pcm_substream *substream;
44 unsigned int buf_base, buf_limit, buf_rp;
45 size_t buf_size, get_size, dma_offset;
46};
47
48static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
49 .info = SNDRV_PCM_INFO_MMAP |
50 SNDRV_PCM_INFO_MMAP_VALID |
51 SNDRV_PCM_INFO_INTERLEAVED,
52 .formats = SNDRV_PCM_FMTBIT_S16_LE,
53 .period_bytes_min = PAGE_SIZE,
54 .period_bytes_max = 0x20000 / 8,
55 .periods_min = 8,
56 .periods_max = 8,
57 .channels_min = 1,
58 .channels_max = 1,
59 .buffer_bytes_max = 0x20000,
60};
61
62static struct snd_soc_dai_driver rt5514_spi_dai = {
63 .name = "rt5514-dsp-cpu-dai",
64 .id = 0,
65 .capture = {
66 .stream_name = "DSP Capture",
67 .channels_min = 1,
68 .channels_max = 1,
69 .rates = SNDRV_PCM_RATE_16000,
70 .formats = SNDRV_PCM_FMTBIT_S16_LE,
71 },
72};
73
74static void rt5514_spi_copy_work(struct work_struct *work)
75{
76 struct rt5514_dsp *rt5514_dsp =
77 container_of(work, struct rt5514_dsp, copy_work.work);
78 struct snd_pcm_runtime *runtime;
79 size_t period_bytes, truncated_bytes = 0;
80 unsigned int cur_wp, remain_data;
81 u8 buf[8];
82
83 mutex_lock(&rt5514_dsp->dma_lock);
84 if (!rt5514_dsp->substream) {
85 dev_err(rt5514_dsp->dev, "No pcm substream\n");
86 goto done;
87 }
88
89 runtime = rt5514_dsp->substream->runtime;
90 period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
91 if (!period_bytes) {
92 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
93 goto done;
94 }
95
96 if (rt5514_dsp->buf_size % period_bytes)
97 rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
98 period_bytes;
99
100 if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
101 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
102 sizeof(buf));
103 cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
104 buf[3] << 24;
105
106 if (cur_wp >= rt5514_dsp->buf_rp)
107 remain_data = (cur_wp - rt5514_dsp->buf_rp);
108 else
109 remain_data =
110 (rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
111 (cur_wp - rt5514_dsp->buf_base);
112
113 if (remain_data < period_bytes) {
114 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
115 goto done;
116 }
117 }
118
119 if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
120 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
121 runtime->dma_area + rt5514_dsp->dma_offset,
122 period_bytes);
123
124 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
125 rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
126 else
127 rt5514_dsp->buf_rp += period_bytes;
128 } else {
129 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
130 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
131 runtime->dma_area + rt5514_dsp->dma_offset,
132 truncated_bytes);
133
134 rt5514_spi_burst_read(rt5514_dsp->buf_base,
135 runtime->dma_area + rt5514_dsp->dma_offset +
136 truncated_bytes, period_bytes - truncated_bytes);
137
138 rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
139 truncated_bytes;
140 }
141
142 rt5514_dsp->get_size += period_bytes;
143 rt5514_dsp->dma_offset += period_bytes;
144 if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
145 rt5514_dsp->dma_offset = 0;
146
147 snd_pcm_period_elapsed(rt5514_dsp->substream);
148
149 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
150
151done:
152 mutex_unlock(&rt5514_dsp->dma_lock);
153}
154
155static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
156{
157 u8 buf[8];
158
159 if (!rt5514_dsp->substream)
160 return;
161
162 rt5514_dsp->get_size = 0;
163
164 /**
165 * The address area x1800XXXX is the register address, and it cannot
166 * support spi burst read perfectly. So we use the spi burst read
167 * individually to make sure the data correctly.
168 */
169 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
170 sizeof(buf));
171 rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
172 buf[3] << 24;
173
174 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
175 sizeof(buf));
176 rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
177 buf[3] << 24;
178
179 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
180 sizeof(buf));
181 rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
182 buf[3] << 24;
183
184 if (rt5514_dsp->buf_rp % 8)
185 rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
186
187 rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
188
189 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
190 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
191 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
192}
193
194static irqreturn_t rt5514_spi_irq(int irq, void *data)
195{
196 struct rt5514_dsp *rt5514_dsp = data;
197
198 rt5514_schedule_copy(rt5514_dsp);
199
200 return IRQ_HANDLED;
201}
202
203/* PCM for streaming audio from the DSP buffer */
204static int rt5514_spi_pcm_open(struct snd_soc_component *component,
205 struct snd_pcm_substream *substream)
206{
207 snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
208
209 return 0;
210}
211
212static int rt5514_spi_hw_params(struct snd_soc_component *component,
213 struct snd_pcm_substream *substream,
214 struct snd_pcm_hw_params *hw_params)
215{
216 struct rt5514_dsp *rt5514_dsp =
217 snd_soc_component_get_drvdata(component);
218 u8 buf[8];
219
220 mutex_lock(&rt5514_dsp->dma_lock);
221 rt5514_dsp->substream = substream;
222 rt5514_dsp->dma_offset = 0;
223
224 /* Read IRQ status and schedule copy accordingly. */
225 rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
226 if (buf[0] & RT5514_IRQ_STATUS_BIT)
227 rt5514_schedule_copy(rt5514_dsp);
228
229 mutex_unlock(&rt5514_dsp->dma_lock);
230
231 return 0;
232}
233
234static int rt5514_spi_hw_free(struct snd_soc_component *component,
235 struct snd_pcm_substream *substream)
236{
237 struct rt5514_dsp *rt5514_dsp =
238 snd_soc_component_get_drvdata(component);
239
240 mutex_lock(&rt5514_dsp->dma_lock);
241 rt5514_dsp->substream = NULL;
242 mutex_unlock(&rt5514_dsp->dma_lock);
243
244 cancel_delayed_work_sync(&rt5514_dsp->copy_work);
245
246 return 0;
247}
248
249static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
250 struct snd_soc_component *component,
251 struct snd_pcm_substream *substream)
252{
253 struct snd_pcm_runtime *runtime = substream->runtime;
254 struct rt5514_dsp *rt5514_dsp =
255 snd_soc_component_get_drvdata(component);
256
257 return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
258}
259
260
261static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
262{
263 struct rt5514_dsp *rt5514_dsp;
264 int ret;
265
266 rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
267 GFP_KERNEL);
268 if (!rt5514_dsp)
269 return -ENOMEM;
270
271 rt5514_dsp->dev = &rt5514_spi->dev;
272 mutex_init(&rt5514_dsp->dma_lock);
273 INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
274 snd_soc_component_set_drvdata(component, rt5514_dsp);
275
276 if (rt5514_spi->irq) {
277 ret = devm_request_threaded_irq(&rt5514_spi->dev,
278 rt5514_spi->irq, NULL, rt5514_spi_irq,
279 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
280 rt5514_dsp);
281 if (ret)
282 dev_err(&rt5514_spi->dev,
283 "%s Failed to reguest IRQ: %d\n", __func__,
284 ret);
285 else
286 device_init_wakeup(rt5514_dsp->dev, true);
287 }
288
289 return 0;
290}
291
292static int rt5514_spi_pcm_new(struct snd_soc_component *component,
293 struct snd_soc_pcm_runtime *rtd)
294{
295 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
296 NULL, 0, 0);
297 return 0;
298}
299
300static const struct snd_soc_component_driver rt5514_spi_component = {
301 .name = DRV_NAME,
302 .probe = rt5514_spi_pcm_probe,
303 .open = rt5514_spi_pcm_open,
304 .hw_params = rt5514_spi_hw_params,
305 .hw_free = rt5514_spi_hw_free,
306 .pointer = rt5514_spi_pcm_pointer,
307 .pcm_construct = rt5514_spi_pcm_new,
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");