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1// SPDX-License-Identifier: GPL-2.0-only
2//
3// CS35L56 ALSA SoC audio driver SoundWire binding
4//
5// Copyright (C) 2023 Cirrus Logic, Inc. and
6// Cirrus Logic International Semiconductor Ltd.
7
8#include <linux/delay.h>
9#include <linux/device.h>
10#include <linux/err.h>
11#include <linux/module.h>
12#include <linux/pm_runtime.h>
13#include <linux/regmap.h>
14#include <linux/soundwire/sdw.h>
15#include <linux/soundwire/sdw_registers.h>
16#include <linux/soundwire/sdw_type.h>
17#include <linux/swab.h>
18#include <linux/types.h>
19#include <linux/workqueue.h>
20
21#include "cs35l56.h"
22
23/* Register addresses are offset when sent over SoundWire */
24#define CS35L56_SDW_ADDR_OFFSET 0x8000
25
26static int cs35l56_sdw_read_one(struct sdw_slave *peripheral, unsigned int reg, void *buf)
27{
28 int ret;
29
30 ret = sdw_nread_no_pm(peripheral, reg, 4, (u8 *)buf);
31 if (ret != 0) {
32 dev_err(&peripheral->dev, "Read failed @%#x:%d\n", reg, ret);
33 return ret;
34 }
35
36 swab32s((u32 *)buf);
37
38 return 0;
39}
40
41static int cs35l56_sdw_read(void *context, const void *reg_buf,
42 const size_t reg_size, void *val_buf,
43 size_t val_size)
44{
45 struct sdw_slave *peripheral = context;
46 u8 *buf8 = val_buf;
47 unsigned int reg, bytes;
48 int ret;
49
50 reg = le32_to_cpu(*(const __le32 *)reg_buf);
51 reg += CS35L56_SDW_ADDR_OFFSET;
52
53 if (val_size == 4)
54 return cs35l56_sdw_read_one(peripheral, reg, val_buf);
55
56 while (val_size) {
57 bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */
58 if (bytes > val_size)
59 bytes = val_size;
60
61 ret = sdw_nread_no_pm(peripheral, reg, bytes, buf8);
62 if (ret != 0) {
63 dev_err(&peripheral->dev, "Read failed @%#x..%#x:%d\n",
64 reg, reg + bytes - 1, ret);
65 return ret;
66 }
67
68 swab32_array((u32 *)buf8, bytes / 4);
69 val_size -= bytes;
70 reg += bytes;
71 buf8 += bytes;
72 }
73
74 return 0;
75}
76
77static inline void cs35l56_swab_copy(void *dest, const void *src, size_t nbytes)
78{
79 u32 *dest32 = dest;
80 const u32 *src32 = src;
81
82 for (; nbytes > 0; nbytes -= 4)
83 *dest32++ = swab32(*src32++);
84}
85
86static int cs35l56_sdw_write_one(struct sdw_slave *peripheral, unsigned int reg, const void *buf)
87{
88 u32 val_le = swab32(*(u32 *)buf);
89 int ret;
90
91 ret = sdw_nwrite_no_pm(peripheral, reg, 4, (u8 *)&val_le);
92 if (ret != 0) {
93 dev_err(&peripheral->dev, "Write failed @%#x:%d\n", reg, ret);
94 return ret;
95 }
96
97 return 0;
98}
99
100static int cs35l56_sdw_gather_write(void *context,
101 const void *reg_buf, size_t reg_size,
102 const void *val_buf, size_t val_size)
103{
104 struct sdw_slave *peripheral = context;
105 const u8 *src_be = val_buf;
106 u32 val_le_buf[64]; /* Define u32 so it is 32-bit aligned */
107 unsigned int reg, bytes;
108 int ret;
109
110 reg = le32_to_cpu(*(const __le32 *)reg_buf);
111 reg += CS35L56_SDW_ADDR_OFFSET;
112
113 if (val_size == 4)
114 return cs35l56_sdw_write_one(peripheral, reg, src_be);
115
116 while (val_size) {
117 bytes = SDW_REG_NO_PAGE - (reg & SDW_REGADDR); /* to end of page */
118 if (bytes > val_size)
119 bytes = val_size;
120 if (bytes > sizeof(val_le_buf))
121 bytes = sizeof(val_le_buf);
122
123 cs35l56_swab_copy(val_le_buf, src_be, bytes);
124
125 ret = sdw_nwrite_no_pm(peripheral, reg, bytes, (u8 *)val_le_buf);
126 if (ret != 0) {
127 dev_err(&peripheral->dev, "Write failed @%#x..%#x:%d\n",
128 reg, reg + bytes - 1, ret);
129 return ret;
130 }
131
132 val_size -= bytes;
133 reg += bytes;
134 src_be += bytes;
135 }
136
137 return 0;
138}
139
140static int cs35l56_sdw_write(void *context, const void *val_buf, size_t val_size)
141{
142 const u8 *src_buf = val_buf;
143
144 /* First word of val_buf contains the destination address */
145 return cs35l56_sdw_gather_write(context, &src_buf[0], 4, &src_buf[4], val_size - 4);
146}
147
148/*
149 * Registers are big-endian on I2C and SPI but little-endian on SoundWire.
150 * Exported firmware controls are big-endian on I2C/SPI but little-endian on
151 * SoundWire. Firmware files are always big-endian and are opaque blobs.
152 * Present a big-endian regmap and hide the endianness swap, so that the ALSA
153 * byte controls always have the same byte order, and firmware file blobs
154 * can be written verbatim.
155 */
156static const struct regmap_bus cs35l56_regmap_bus_sdw = {
157 .read = cs35l56_sdw_read,
158 .write = cs35l56_sdw_write,
159 .gather_write = cs35l56_sdw_gather_write,
160 .reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
161 .val_format_endian_default = REGMAP_ENDIAN_BIG,
162};
163
164static int cs35l56_sdw_set_cal_index(struct cs35l56_private *cs35l56)
165{
166 int ret;
167
168 /* SoundWire UniqueId is used to index the calibration array */
169 ret = sdw_read_no_pm(cs35l56->sdw_peripheral, SDW_SCP_DEVID_0);
170 if (ret < 0)
171 return ret;
172
173 cs35l56->base.cal_index = ret & 0xf;
174
175 return 0;
176}
177
178static void cs35l56_sdw_init(struct sdw_slave *peripheral)
179{
180 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
181 int ret;
182
183 pm_runtime_get_noresume(cs35l56->base.dev);
184
185 if (cs35l56->base.cal_index < 0) {
186 ret = cs35l56_sdw_set_cal_index(cs35l56);
187 if (ret < 0)
188 goto out;
189 }
190
191 ret = cs35l56_init(cs35l56);
192 if (ret < 0) {
193 regcache_cache_only(cs35l56->base.regmap, true);
194 goto out;
195 }
196
197 /*
198 * cs35l56_init can return with !init_done if it triggered
199 * a soft reset.
200 */
201 if (cs35l56->base.init_done) {
202 /* Enable SoundWire interrupts */
203 sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1,
204 CS35L56_SDW_INT_MASK_CODEC_IRQ);
205 }
206
207out:
208 pm_runtime_mark_last_busy(cs35l56->base.dev);
209 pm_runtime_put_autosuspend(cs35l56->base.dev);
210}
211
212static int cs35l56_sdw_interrupt(struct sdw_slave *peripheral,
213 struct sdw_slave_intr_status *status)
214{
215 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
216
217 /* SoundWire core holds our pm_runtime when calling this function. */
218
219 dev_dbg(cs35l56->base.dev, "int control_port=%#x\n", status->control_port);
220
221 if ((status->control_port & SDW_SCP_INT1_IMPL_DEF) == 0)
222 return 0;
223
224 /*
225 * Prevent bus manager suspending and possibly issuing a
226 * bus-reset before the queued work has run.
227 */
228 pm_runtime_get_noresume(cs35l56->base.dev);
229
230 /*
231 * Mask and clear until it has been handled. The read of GEN_INT_STAT_1
232 * is required as per the SoundWire spec for interrupt status bits
233 * to clear. GEN_INT_MASK_1 masks the _inputs_ to GEN_INT_STAT1.
234 * None of the interrupts are time-critical so use the
235 * power-efficient queue.
236 */
237 sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
238 sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);
239 sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
240 queue_work(system_power_efficient_wq, &cs35l56->sdw_irq_work);
241
242 return 0;
243}
244
245static void cs35l56_sdw_irq_work(struct work_struct *work)
246{
247 struct cs35l56_private *cs35l56 = container_of(work,
248 struct cs35l56_private,
249 sdw_irq_work);
250
251 cs35l56_irq(-1, &cs35l56->base);
252
253 /* unmask interrupts */
254 if (!cs35l56->sdw_irq_no_unmask)
255 sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,
256 CS35L56_SDW_INT_MASK_CODEC_IRQ);
257
258 pm_runtime_put_autosuspend(cs35l56->base.dev);
259}
260
261static int cs35l56_sdw_read_prop(struct sdw_slave *peripheral)
262{
263 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
264 struct sdw_slave_prop *prop = &peripheral->prop;
265 struct sdw_dpn_prop *ports;
266
267 ports = devm_kcalloc(cs35l56->base.dev, 2, sizeof(*ports), GFP_KERNEL);
268 if (!ports)
269 return -ENOMEM;
270
271 prop->source_ports = BIT(CS35L56_SDW1_CAPTURE_PORT);
272 prop->sink_ports = BIT(CS35L56_SDW1_PLAYBACK_PORT);
273 prop->paging_support = true;
274 prop->clk_stop_mode1 = false;
275 prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;
276 prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY | SDW_SCP_INT1_IMPL_DEF;
277
278 /* DP1 - playback */
279 ports[0].num = CS35L56_SDW1_PLAYBACK_PORT;
280 ports[0].type = SDW_DPN_FULL;
281 ports[0].ch_prep_timeout = 10;
282 prop->sink_dpn_prop = &ports[0];
283
284 /* DP3 - capture */
285 ports[1].num = CS35L56_SDW1_CAPTURE_PORT;
286 ports[1].type = SDW_DPN_FULL;
287 ports[1].ch_prep_timeout = 10;
288 prop->src_dpn_prop = &ports[1];
289
290 return 0;
291}
292
293static int cs35l56_sdw_update_status(struct sdw_slave *peripheral,
294 enum sdw_slave_status status)
295{
296 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
297
298 switch (status) {
299 case SDW_SLAVE_ATTACHED:
300 dev_dbg(cs35l56->base.dev, "%s: ATTACHED\n", __func__);
301 if (cs35l56->sdw_attached)
302 break;
303
304 if (!cs35l56->base.init_done || cs35l56->soft_resetting)
305 cs35l56_sdw_init(peripheral);
306
307 cs35l56->sdw_attached = true;
308 break;
309 case SDW_SLAVE_UNATTACHED:
310 dev_dbg(cs35l56->base.dev, "%s: UNATTACHED\n", __func__);
311 cs35l56->sdw_attached = false;
312 break;
313 default:
314 break;
315 }
316
317 return 0;
318}
319
320static int cs35l56_a1_kick_divider(struct cs35l56_private *cs35l56,
321 struct sdw_slave *peripheral)
322{
323 unsigned int curr_scale_reg, next_scale_reg;
324 int curr_scale, next_scale, ret;
325
326 if (!cs35l56->base.init_done)
327 return 0;
328
329 if (peripheral->bus->params.curr_bank) {
330 curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
331 next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
332 } else {
333 curr_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B0;
334 next_scale_reg = SDW_SCP_BUSCLOCK_SCALE_B1;
335 }
336
337 /*
338 * Current clock scale value must be different to new value.
339 * Modify current to guarantee this. If next still has the dummy
340 * value we wrote when it was current, the core code has not set
341 * a new scale so restore its original good value
342 */
343 curr_scale = sdw_read_no_pm(peripheral, curr_scale_reg);
344 if (curr_scale < 0) {
345 dev_err(cs35l56->base.dev, "Failed to read current clock scale: %d\n", curr_scale);
346 return curr_scale;
347 }
348
349 next_scale = sdw_read_no_pm(peripheral, next_scale_reg);
350 if (next_scale < 0) {
351 dev_err(cs35l56->base.dev, "Failed to read next clock scale: %d\n", next_scale);
352 return next_scale;
353 }
354
355 if (next_scale == CS35L56_SDW_INVALID_BUS_SCALE) {
356 next_scale = cs35l56->old_sdw_clock_scale;
357 ret = sdw_write_no_pm(peripheral, next_scale_reg, next_scale);
358 if (ret < 0) {
359 dev_err(cs35l56->base.dev, "Failed to modify current clock scale: %d\n",
360 ret);
361 return ret;
362 }
363 }
364
365 cs35l56->old_sdw_clock_scale = curr_scale;
366 ret = sdw_write_no_pm(peripheral, curr_scale_reg, CS35L56_SDW_INVALID_BUS_SCALE);
367 if (ret < 0) {
368 dev_err(cs35l56->base.dev, "Failed to modify current clock scale: %d\n", ret);
369 return ret;
370 }
371
372 dev_dbg(cs35l56->base.dev, "Next bus scale: %#x\n", next_scale);
373
374 return 0;
375}
376
377static int cs35l56_sdw_bus_config(struct sdw_slave *peripheral,
378 struct sdw_bus_params *params)
379{
380 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
381 int sclk;
382
383 sclk = params->curr_dr_freq / 2;
384 dev_dbg(cs35l56->base.dev, "%s: sclk=%u c=%u r=%u\n",
385 __func__, sclk, params->col, params->row);
386
387 if ((cs35l56->base.type == 0x56) && (cs35l56->base.rev < 0xb0))
388 return cs35l56_a1_kick_divider(cs35l56, peripheral);
389
390 return 0;
391}
392
393static int __maybe_unused cs35l56_sdw_clk_stop(struct sdw_slave *peripheral,
394 enum sdw_clk_stop_mode mode,
395 enum sdw_clk_stop_type type)
396{
397 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
398
399 dev_dbg(cs35l56->base.dev, "%s: mode:%d type:%d\n", __func__, mode, type);
400
401 return 0;
402}
403
404static const struct sdw_slave_ops cs35l56_sdw_ops = {
405 .read_prop = cs35l56_sdw_read_prop,
406 .interrupt_callback = cs35l56_sdw_interrupt,
407 .update_status = cs35l56_sdw_update_status,
408 .bus_config = cs35l56_sdw_bus_config,
409#ifdef DEBUG
410 .clk_stop = cs35l56_sdw_clk_stop,
411#endif
412};
413
414static int __maybe_unused cs35l56_sdw_handle_unattach(struct cs35l56_private *cs35l56)
415{
416 struct sdw_slave *peripheral = cs35l56->sdw_peripheral;
417
418 if (peripheral->unattach_request) {
419 /* Cannot access registers until bus is re-initialized. */
420 dev_dbg(cs35l56->base.dev, "Wait for initialization_complete\n");
421 if (!wait_for_completion_timeout(&peripheral->initialization_complete,
422 msecs_to_jiffies(5000))) {
423 dev_err(cs35l56->base.dev, "initialization_complete timed out\n");
424 return -ETIMEDOUT;
425 }
426
427 peripheral->unattach_request = 0;
428
429 /*
430 * Don't call regcache_mark_dirty(), we can't be sure that the
431 * Manager really did issue a Bus Reset.
432 */
433 }
434
435 return 0;
436}
437
438static int __maybe_unused cs35l56_sdw_runtime_suspend(struct device *dev)
439{
440 struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
441
442 if (!cs35l56->base.init_done)
443 return 0;
444
445 return cs35l56_runtime_suspend_common(&cs35l56->base);
446}
447
448static int __maybe_unused cs35l56_sdw_runtime_resume(struct device *dev)
449{
450 struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
451 int ret;
452
453 dev_dbg(dev, "Runtime resume\n");
454
455 if (!cs35l56->base.init_done)
456 return 0;
457
458 ret = cs35l56_sdw_handle_unattach(cs35l56);
459 if (ret < 0)
460 return ret;
461
462 ret = cs35l56_runtime_resume_common(&cs35l56->base, true);
463 if (ret)
464 return ret;
465
466 /* Re-enable SoundWire interrupts */
467 sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1,
468 CS35L56_SDW_INT_MASK_CODEC_IRQ);
469
470 return 0;
471}
472
473static int __maybe_unused cs35l56_sdw_system_suspend(struct device *dev)
474{
475 struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
476
477 if (!cs35l56->base.init_done)
478 return 0;
479
480 /*
481 * Disable SoundWire interrupts.
482 * Flush - don't cancel because that could leave an unbalanced pm_runtime_get.
483 */
484 cs35l56->sdw_irq_no_unmask = true;
485 flush_work(&cs35l56->sdw_irq_work);
486
487 /* Mask interrupts and flush in case sdw_irq_work was queued again */
488 sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
489 sdw_read_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1);
490 sdw_write_no_pm(cs35l56->sdw_peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
491 flush_work(&cs35l56->sdw_irq_work);
492
493 return cs35l56_system_suspend(dev);
494}
495
496static int __maybe_unused cs35l56_sdw_system_resume(struct device *dev)
497{
498 struct cs35l56_private *cs35l56 = dev_get_drvdata(dev);
499
500 cs35l56->sdw_irq_no_unmask = false;
501 /* runtime_resume re-enables the interrupt */
502
503 return cs35l56_system_resume(dev);
504}
505
506static int cs35l56_sdw_probe(struct sdw_slave *peripheral, const struct sdw_device_id *id)
507{
508 struct device *dev = &peripheral->dev;
509 struct cs35l56_private *cs35l56;
510 int ret;
511
512 cs35l56 = devm_kzalloc(dev, sizeof(*cs35l56), GFP_KERNEL);
513 if (!cs35l56)
514 return -ENOMEM;
515
516 cs35l56->base.dev = dev;
517 cs35l56->sdw_peripheral = peripheral;
518 INIT_WORK(&cs35l56->sdw_irq_work, cs35l56_sdw_irq_work);
519
520 dev_set_drvdata(dev, cs35l56);
521
522 cs35l56->base.regmap = devm_regmap_init(dev, &cs35l56_regmap_bus_sdw,
523 peripheral, &cs35l56_regmap_sdw);
524 if (IS_ERR(cs35l56->base.regmap)) {
525 ret = PTR_ERR(cs35l56->base.regmap);
526 return dev_err_probe(dev, ret, "Failed to allocate register map\n");
527 }
528
529 /* Start in cache-only until device is enumerated */
530 regcache_cache_only(cs35l56->base.regmap, true);
531
532 ret = cs35l56_common_probe(cs35l56);
533 if (ret != 0)
534 return ret;
535
536 return 0;
537}
538
539static int cs35l56_sdw_remove(struct sdw_slave *peripheral)
540{
541 struct cs35l56_private *cs35l56 = dev_get_drvdata(&peripheral->dev);
542
543 /* Disable SoundWire interrupts */
544 cs35l56->sdw_irq_no_unmask = true;
545 cancel_work_sync(&cs35l56->sdw_irq_work);
546 sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_MASK_1, 0);
547 sdw_read_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1);
548 sdw_write_no_pm(peripheral, CS35L56_SDW_GEN_INT_STAT_1, 0xFF);
549
550 cs35l56_remove(cs35l56);
551
552 return 0;
553}
554
555static const struct dev_pm_ops cs35l56_sdw_pm = {
556 SET_RUNTIME_PM_OPS(cs35l56_sdw_runtime_suspend, cs35l56_sdw_runtime_resume, NULL)
557 SYSTEM_SLEEP_PM_OPS(cs35l56_sdw_system_suspend, cs35l56_sdw_system_resume)
558 LATE_SYSTEM_SLEEP_PM_OPS(cs35l56_system_suspend_late, cs35l56_system_resume_early)
559 /* NOIRQ stage not needed, SoundWire doesn't use a hard IRQ */
560};
561
562static const struct sdw_device_id cs35l56_sdw_id[] = {
563 SDW_SLAVE_ENTRY(0x01FA, 0x3556, 0),
564 SDW_SLAVE_ENTRY(0x01FA, 0x3557, 0),
565 {},
566};
567MODULE_DEVICE_TABLE(sdw, cs35l56_sdw_id);
568
569static struct sdw_driver cs35l56_sdw_driver = {
570 .driver = {
571 .name = "cs35l56",
572 .pm = pm_ptr(&cs35l56_sdw_pm),
573 },
574 .probe = cs35l56_sdw_probe,
575 .remove = cs35l56_sdw_remove,
576 .ops = &cs35l56_sdw_ops,
577 .id_table = cs35l56_sdw_id,
578};
579
580module_sdw_driver(cs35l56_sdw_driver);
581
582MODULE_DESCRIPTION("ASoC CS35L56 SoundWire driver");
583MODULE_IMPORT_NS(SND_SOC_CS35L56_CORE);
584MODULE_IMPORT_NS(SND_SOC_CS35L56_SHARED);
585MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
586MODULE_AUTHOR("Simon Trimmer <simont@opensource.cirrus.com>");
587MODULE_LICENSE("GPL");