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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
38static struct spi_device *rt5514_spi;
39
40struct rt5514_dsp {
41 struct device *dev;
42 struct delayed_work copy_work;
43 struct mutex dma_lock;
44 struct snd_pcm_substream *substream;
45 unsigned int buf_base, buf_limit, buf_rp;
46 size_t buf_size;
47 size_t dma_offset;
48 size_t dsp_offset;
49};
50
51static 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
65static 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
77static 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
84 mutex_lock(&rt5514_dsp->dma_lock);
85 if (!rt5514_dsp->substream) {
86 dev_err(rt5514_dsp->dev, "No pcm substream\n");
87 goto done;
88 }
89
90 runtime = rt5514_dsp->substream->runtime;
91 period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
92
93 if (rt5514_dsp->buf_size - rt5514_dsp->dsp_offset < period_bytes)
94 period_bytes = rt5514_dsp->buf_size - rt5514_dsp->dsp_offset;
95
96 if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
97 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
98 runtime->dma_area + rt5514_dsp->dma_offset,
99 period_bytes);
100
101 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
102 rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
103 else
104 rt5514_dsp->buf_rp += period_bytes;
105 } else {
106 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
107 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
108 runtime->dma_area + rt5514_dsp->dma_offset,
109 truncated_bytes);
110
111 rt5514_spi_burst_read(rt5514_dsp->buf_base,
112 runtime->dma_area + rt5514_dsp->dma_offset +
113 truncated_bytes, period_bytes - truncated_bytes);
114
115 rt5514_dsp->buf_rp = rt5514_dsp->buf_base +
116 period_bytes - truncated_bytes;
117 }
118
119 rt5514_dsp->dma_offset += period_bytes;
120 if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
121 rt5514_dsp->dma_offset = 0;
122
123 rt5514_dsp->dsp_offset += period_bytes;
124
125 snd_pcm_period_elapsed(rt5514_dsp->substream);
126
127 if (rt5514_dsp->dsp_offset < rt5514_dsp->buf_size)
128 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
129done:
130 mutex_unlock(&rt5514_dsp->dma_lock);
131}
132
133
134static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
135{
136 snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
137
138 return 0;
139}
140
141static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
142 struct snd_pcm_hw_params *hw_params)
143{
144 struct snd_soc_pcm_runtime *rtd = substream->private_data;
145 struct rt5514_dsp *rt5514_dsp =
146 snd_soc_platform_get_drvdata(rtd->platform);
147 int ret;
148
149 mutex_lock(&rt5514_dsp->dma_lock);
150 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
151 params_buffer_bytes(hw_params));
152 rt5514_dsp->substream = substream;
153 mutex_unlock(&rt5514_dsp->dma_lock);
154
155 return ret;
156}
157
158static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
159{
160 struct snd_soc_pcm_runtime *rtd = substream->private_data;
161 struct rt5514_dsp *rt5514_dsp =
162 snd_soc_platform_get_drvdata(rtd->platform);
163
164 mutex_lock(&rt5514_dsp->dma_lock);
165 rt5514_dsp->substream = NULL;
166 mutex_unlock(&rt5514_dsp->dma_lock);
167
168 cancel_delayed_work_sync(&rt5514_dsp->copy_work);
169
170 return snd_pcm_lib_free_vmalloc_buffer(substream);
171}
172
173static int rt5514_spi_prepare(struct snd_pcm_substream *substream)
174{
175 struct snd_soc_pcm_runtime *rtd = substream->private_data;
176 struct rt5514_dsp *rt5514_dsp =
177 snd_soc_platform_get_drvdata(rtd->platform);
178 u8 buf[8];
179
180 rt5514_dsp->dma_offset = 0;
181 rt5514_dsp->dsp_offset = 0;
182
183
184
185
186
187
188 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
189 sizeof(buf));
190 rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
191 buf[3] << 24;
192
193 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
194 sizeof(buf));
195 rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
196 buf[3] << 24;
197
198 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_RP, (u8 *)&buf,
199 sizeof(buf));
200 rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
201 buf[3] << 24;
202
203 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_SIZE, (u8 *)&buf,
204 sizeof(buf));
205 rt5514_dsp->buf_size = buf[0] | buf[1] << 8 | buf[2] << 16 |
206 buf[3] << 24;
207
208 return 0;
209}
210
211static int rt5514_spi_trigger(struct snd_pcm_substream *substream, int cmd)
212{
213 struct snd_soc_pcm_runtime *rtd = substream->private_data;
214 struct rt5514_dsp *rt5514_dsp =
215 snd_soc_platform_get_drvdata(rtd->platform);
216
217 if (cmd == SNDRV_PCM_TRIGGER_START) {
218 if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
219 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
220 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
221 }
222
223 return 0;
224}
225
226static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
227 struct snd_pcm_substream *substream)
228{
229 struct snd_pcm_runtime *runtime = substream->runtime;
230 struct snd_soc_pcm_runtime *rtd = substream->private_data;
231 struct rt5514_dsp *rt5514_dsp =
232 snd_soc_platform_get_drvdata(rtd->platform);
233
234 return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
235}
236
237static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
238 .open = rt5514_spi_pcm_open,
239 .hw_params = rt5514_spi_hw_params,
240 .hw_free = rt5514_spi_hw_free,
241 .trigger = rt5514_spi_trigger,
242 .prepare = rt5514_spi_prepare,
243 .pointer = rt5514_spi_pcm_pointer,
244 .mmap = snd_pcm_lib_mmap_vmalloc,
245 .page = snd_pcm_lib_get_vmalloc_page,
246};
247
248static int rt5514_spi_pcm_probe(struct snd_soc_platform *platform)
249{
250 struct rt5514_dsp *rt5514_dsp;
251
252 rt5514_dsp = devm_kzalloc(platform->dev, sizeof(*rt5514_dsp),
253 GFP_KERNEL);
254
255 rt5514_dsp->dev = &rt5514_spi->dev;
256 mutex_init(&rt5514_dsp->dma_lock);
257 INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
258 snd_soc_platform_set_drvdata(platform, rt5514_dsp);
259
260 return 0;
261}
262
263static struct snd_soc_platform_driver rt5514_spi_platform = {
264 .probe = rt5514_spi_pcm_probe,
265 .ops = &rt5514_spi_pcm_ops,
266};
267
268static const struct snd_soc_component_driver rt5514_spi_dai_component = {
269 .name = "rt5514-spi-dai",
270};
271
272
273
274
275
276
277
278
279
280
281int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
282{
283 u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
284 int status;
285 u8 write_buf[8];
286 unsigned int i, end, offset = 0;
287
288 struct spi_message message;
289 struct spi_transfer x[3];
290
291 while (offset < len) {
292 if (offset + RT5514_SPI_BUF_LEN <= len)
293 end = RT5514_SPI_BUF_LEN;
294 else
295 end = len % RT5514_SPI_BUF_LEN;
296
297 write_buf[0] = spi_cmd;
298 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
299 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
300 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
301 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
302
303 spi_message_init(&message);
304 memset(x, 0, sizeof(x));
305
306 x[0].len = 5;
307 x[0].tx_buf = write_buf;
308 spi_message_add_tail(&x[0], &message);
309
310 x[1].len = 4;
311 x[1].tx_buf = write_buf;
312 spi_message_add_tail(&x[1], &message);
313
314 x[2].len = end;
315 x[2].rx_buf = rxbuf + offset;
316 spi_message_add_tail(&x[2], &message);
317
318 status = spi_sync(rt5514_spi, &message);
319
320 if (status)
321 return false;
322
323 offset += RT5514_SPI_BUF_LEN;
324 }
325
326 for (i = 0; i < len; i += 8) {
327 write_buf[0] = rxbuf[i + 0];
328 write_buf[1] = rxbuf[i + 1];
329 write_buf[2] = rxbuf[i + 2];
330 write_buf[3] = rxbuf[i + 3];
331 write_buf[4] = rxbuf[i + 4];
332 write_buf[5] = rxbuf[i + 5];
333 write_buf[6] = rxbuf[i + 6];
334 write_buf[7] = rxbuf[i + 7];
335
336 rxbuf[i + 0] = write_buf[7];
337 rxbuf[i + 1] = write_buf[6];
338 rxbuf[i + 2] = write_buf[5];
339 rxbuf[i + 3] = write_buf[4];
340 rxbuf[i + 4] = write_buf[3];
341 rxbuf[i + 5] = write_buf[2];
342 rxbuf[i + 6] = write_buf[1];
343 rxbuf[i + 7] = write_buf[0];
344 }
345
346 return true;
347}
348
349
350
351
352
353
354
355
356
357
358int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
359{
360 u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
361 u8 *write_buf;
362 unsigned int i, end, offset = 0;
363
364 write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
365
366 if (write_buf == NULL)
367 return -ENOMEM;
368
369 while (offset < len) {
370 if (offset + RT5514_SPI_BUF_LEN <= len)
371 end = RT5514_SPI_BUF_LEN;
372 else
373 end = len % RT5514_SPI_BUF_LEN;
374
375 write_buf[0] = spi_cmd;
376 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
377 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
378 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
379 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
380
381 for (i = 0; i < end; i += 8) {
382 write_buf[i + 12] = txbuf[offset + i + 0];
383 write_buf[i + 11] = txbuf[offset + i + 1];
384 write_buf[i + 10] = txbuf[offset + i + 2];
385 write_buf[i + 9] = txbuf[offset + i + 3];
386 write_buf[i + 8] = txbuf[offset + i + 4];
387 write_buf[i + 7] = txbuf[offset + i + 5];
388 write_buf[i + 6] = txbuf[offset + i + 6];
389 write_buf[i + 5] = txbuf[offset + i + 7];
390 }
391
392 write_buf[end + 5] = spi_cmd;
393
394 spi_write(rt5514_spi, write_buf, end + 6);
395
396 offset += RT5514_SPI_BUF_LEN;
397 }
398
399 kfree(write_buf);
400
401 return 0;
402}
403EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
404
405static int rt5514_spi_probe(struct spi_device *spi)
406{
407 int ret;
408
409 rt5514_spi = spi;
410
411 ret = devm_snd_soc_register_platform(&spi->dev, &rt5514_spi_platform);
412 if (ret < 0) {
413 dev_err(&spi->dev, "Failed to register platform.\n");
414 return ret;
415 }
416
417 ret = devm_snd_soc_register_component(&spi->dev,
418 &rt5514_spi_dai_component,
419 &rt5514_spi_dai, 1);
420 if (ret < 0) {
421 dev_err(&spi->dev, "Failed to register component.\n");
422 return ret;
423 }
424
425 return 0;
426}
427
428static const struct of_device_id rt5514_of_match[] = {
429 { .compatible = "realtek,rt5514", },
430 {},
431};
432MODULE_DEVICE_TABLE(of, rt5514_of_match);
433
434static struct spi_driver rt5514_spi_driver = {
435 .driver = {
436 .name = "rt5514",
437 .of_match_table = of_match_ptr(rt5514_of_match),
438 },
439 .probe = rt5514_spi_probe,
440};
441module_spi_driver(rt5514_spi_driver);
442
443MODULE_DESCRIPTION("RT5514 SPI driver");
444MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
445MODULE_LICENSE("GPL v2");
446
