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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");
1