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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/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
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
186
187
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
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277
278
279
280
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
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352
353
354
355
356
357
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");
447
