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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2// Copyright(c) 2015-22 Intel Corporation.
3
4/*
5 * Soundwire Intel Manager Driver
6 */
7
8#include <linux/acpi.h>
9#include <linux/debugfs.h>
10#include <linux/delay.h>
11#include <linux/module.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/auxiliary_bus.h>
15#include <sound/pcm_params.h>
16#include <linux/pm_runtime.h>
17#include <sound/soc.h>
18#include <linux/soundwire/sdw_registers.h>
19#include <linux/soundwire/sdw.h>
20#include <linux/soundwire/sdw_intel.h>
21#include "cadence_master.h"
22#include "bus.h"
23#include "intel.h"
24#include "intel_auxdevice.h"
25
26#define INTEL_MASTER_SUSPEND_DELAY_MS 3000
27
28/*
29 * debug/config flags for the Intel SoundWire Master.
30 *
31 * Since we may have multiple masters active, we can have up to 8
32 * flags reused in each byte, with master0 using the ls-byte, etc.
33 */
34
35#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME BIT(0)
36#define SDW_INTEL_MASTER_DISABLE_CLOCK_STOP BIT(1)
37#define SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE BIT(2)
38#define SDW_INTEL_MASTER_DISABLE_MULTI_LINK BIT(3)
39
40static int md_flags;
41module_param_named(sdw_md_flags, md_flags, int, 0444);
42MODULE_PARM_DESC(sdw_md_flags, "SoundWire Intel Master device flags (0x0 all off)");
43
44static int mclk_divider;
45module_param_named(sdw_mclk_divider, mclk_divider, int, 0444);
46MODULE_PARM_DESC(sdw_mclk_divider, "SoundWire Intel mclk divider");
47
48struct wake_capable_part {
49 const u16 mfg_id;
50 const u16 part_id;
51};
52
53static struct wake_capable_part wake_capable_list[] = {
54 {0x01fa, 0x2A30},
55 {0x01fa, 0x2A3B},
56 {0x01fa, 0x4243},
57 {0x01fa, 0x4244},
58 {0x01fa, 0x4245},
59 {0x01fa, 0x4249},
60 {0x01fa, 0x4747},
61 {0x025d, 0x5682},
62 {0x025d, 0x700},
63 {0x025d, 0x711},
64 {0x025d, 0x1712},
65 {0x025d, 0x1713},
66 {0x025d, 0x1716},
67 {0x025d, 0x1717},
68 {0x025d, 0x712},
69 {0x025d, 0x713},
70 {0x025d, 0x714},
71 {0x025d, 0x715},
72 {0x025d, 0x716},
73 {0x025d, 0x717},
74 {0x025d, 0x721},
75 {0x025d, 0x722},
76 {0x04b3, 0x9356},
77};
78
79static bool is_wake_capable(struct sdw_slave *slave)
80{
81 int i;
82
83 for (i = 0; i < ARRAY_SIZE(wake_capable_list); i++)
84 if (slave->id.part_id == wake_capable_list[i].part_id &&
85 slave->id.mfg_id == wake_capable_list[i].mfg_id)
86 return true;
87 return false;
88}
89
90static int generic_bpt_send_async(struct sdw_bus *bus, struct sdw_slave *slave,
91 struct sdw_bpt_msg *msg)
92{
93 struct sdw_cdns *cdns = bus_to_cdns(bus);
94 struct sdw_intel *sdw = cdns_to_intel(cdns);
95
96 if (sdw->link_res->hw_ops->bpt_send_async)
97 return sdw->link_res->hw_ops->bpt_send_async(sdw, slave, msg);
98 return -EOPNOTSUPP;
99}
100
101static int generic_bpt_wait(struct sdw_bus *bus, struct sdw_slave *slave, struct sdw_bpt_msg *msg)
102{
103 struct sdw_cdns *cdns = bus_to_cdns(bus);
104 struct sdw_intel *sdw = cdns_to_intel(cdns);
105
106 if (sdw->link_res->hw_ops->bpt_wait)
107 return sdw->link_res->hw_ops->bpt_wait(sdw, slave, msg);
108 return -EOPNOTSUPP;
109}
110
111static int generic_pre_bank_switch(struct sdw_bus *bus)
112{
113 struct sdw_cdns *cdns = bus_to_cdns(bus);
114 struct sdw_intel *sdw = cdns_to_intel(cdns);
115
116 return sdw->link_res->hw_ops->pre_bank_switch(sdw);
117}
118
119static int generic_post_bank_switch(struct sdw_bus *bus)
120{
121 struct sdw_cdns *cdns = bus_to_cdns(bus);
122 struct sdw_intel *sdw = cdns_to_intel(cdns);
123
124 return sdw->link_res->hw_ops->post_bank_switch(sdw);
125}
126
127static void generic_new_peripheral_assigned(struct sdw_bus *bus,
128 struct sdw_slave *slave,
129 int dev_num)
130{
131 struct sdw_cdns *cdns = bus_to_cdns(bus);
132 struct sdw_intel *sdw = cdns_to_intel(cdns);
133 int dev_num_min;
134 int dev_num_max;
135 bool wake_capable = slave->prop.wake_capable || is_wake_capable(slave);
136
137 if (wake_capable) {
138 dev_num_min = SDW_INTEL_DEV_NUM_IDA_MIN;
139 dev_num_max = SDW_MAX_DEVICES;
140 } else {
141 dev_num_min = 1;
142 dev_num_max = SDW_INTEL_DEV_NUM_IDA_MIN - 1;
143 }
144
145 /* paranoia check, this should never happen */
146 if (dev_num < dev_num_min || dev_num > dev_num_max) {
147 dev_err(bus->dev, "%s: invalid dev_num %d, wake supported %d\n",
148 __func__, dev_num, slave->prop.wake_capable);
149 return;
150 }
151
152 if (sdw->link_res->hw_ops->program_sdi && wake_capable)
153 sdw->link_res->hw_ops->program_sdi(sdw, dev_num);
154}
155
156static int sdw_master_read_intel_prop(struct sdw_bus *bus)
157{
158 struct sdw_master_prop *prop = &bus->prop;
159 struct sdw_intel_prop *intel_prop;
160 struct fwnode_handle *link;
161 char name[32];
162 u32 quirk_mask;
163
164 /* Find master handle */
165 snprintf(name, sizeof(name),
166 "mipi-sdw-link-%d-subproperties", bus->link_id);
167
168 link = device_get_named_child_node(bus->dev, name);
169 if (!link) {
170 dev_err(bus->dev, "Master node %s not found\n", name);
171 return -EIO;
172 }
173
174 fwnode_property_read_u32(link,
175 "intel-sdw-ip-clock",
176 &prop->mclk_freq);
177
178 if (mclk_divider)
179 /* use kernel parameter for BIOS or board work-arounds */
180 prop->mclk_freq /= mclk_divider;
181 else
182 /* the values reported by BIOS are the 2x clock, not the bus clock */
183 prop->mclk_freq /= 2;
184
185 fwnode_property_read_u32(link,
186 "intel-quirk-mask",
187 &quirk_mask);
188
189 if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE)
190 prop->hw_disabled = true;
191
192 prop->quirks = SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH |
193 SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY;
194
195 intel_prop = devm_kzalloc(bus->dev, sizeof(*intel_prop), GFP_KERNEL);
196 if (!intel_prop) {
197 fwnode_handle_put(link);
198 return -ENOMEM;
199 }
200
201 /* initialize with hardware defaults, in case the properties are not found */
202 intel_prop->clde = 0x0;
203 intel_prop->doaise2 = 0x0;
204 intel_prop->dodse2 = 0x0;
205 intel_prop->clds = 0x0;
206 intel_prop->clss = 0x0;
207 intel_prop->doaise = 0x1;
208 intel_prop->doais = 0x3;
209 intel_prop->dodse = 0x0;
210 intel_prop->dods = 0x1;
211
212 fwnode_property_read_u16(link,
213 "intel-sdw-clde",
214 &intel_prop->clde);
215 fwnode_property_read_u16(link,
216 "intel-sdw-doaise2",
217 &intel_prop->doaise2);
218 fwnode_property_read_u16(link,
219 "intel-sdw-dodse2",
220 &intel_prop->dodse2);
221 fwnode_property_read_u16(link,
222 "intel-sdw-clds",
223 &intel_prop->clds);
224 fwnode_property_read_u16(link,
225 "intel-sdw-clss",
226 &intel_prop->clss);
227 fwnode_property_read_u16(link,
228 "intel-sdw-doaise",
229 &intel_prop->doaise);
230 fwnode_property_read_u16(link,
231 "intel-sdw-doais",
232 &intel_prop->doais);
233 fwnode_property_read_u16(link,
234 "intel-sdw-dodse",
235 &intel_prop->dodse);
236 fwnode_property_read_u16(link,
237 "intel-sdw-dods",
238 &intel_prop->dods);
239 bus->vendor_specific_prop = intel_prop;
240
241 dev_dbg(bus->dev, "doaise %#x doais %#x dodse %#x dods %#x\n",
242 intel_prop->doaise,
243 intel_prop->doais,
244 intel_prop->dodse,
245 intel_prop->dods);
246
247 fwnode_handle_put(link);
248
249 return 0;
250}
251
252static int intel_prop_read(struct sdw_bus *bus)
253{
254 /* Initialize with default handler to read all DisCo properties */
255 sdw_master_read_prop(bus);
256
257 /* read Intel-specific properties */
258 sdw_master_read_intel_prop(bus);
259
260 return 0;
261}
262
263static DEFINE_IDA(intel_peripheral_ida);
264
265static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
266{
267 int bit;
268
269 if (slave->prop.wake_capable || is_wake_capable(slave))
270 return ida_alloc_range(&intel_peripheral_ida,
271 SDW_INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
272 GFP_KERNEL);
273
274 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
275 if (bit == SDW_MAX_DEVICES)
276 return -ENODEV;
277
278 return bit;
279}
280
281static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
282{
283 if (slave->prop.wake_capable || is_wake_capable(slave))
284 ida_free(&intel_peripheral_ida, slave->dev_num);
285}
286
287static struct sdw_master_ops sdw_intel_ops = {
288 .read_prop = intel_prop_read,
289 .override_adr = sdw_dmi_override_adr,
290 .xfer_msg = cdns_xfer_msg,
291 .xfer_msg_defer = cdns_xfer_msg_defer,
292 .set_bus_conf = cdns_bus_conf,
293 .pre_bank_switch = generic_pre_bank_switch,
294 .post_bank_switch = generic_post_bank_switch,
295 .read_ping_status = cdns_read_ping_status,
296 .get_device_num = intel_get_device_num_ida,
297 .put_device_num = intel_put_device_num_ida,
298 .new_peripheral_assigned = generic_new_peripheral_assigned,
299
300 .bpt_send_async = generic_bpt_send_async,
301 .bpt_wait = generic_bpt_wait,
302};
303
304/*
305 * probe and init (aux_dev_id argument is required by function prototype but not used)
306 */
307static int intel_link_probe(struct auxiliary_device *auxdev,
308 const struct auxiliary_device_id *aux_dev_id)
309
310{
311 struct device *dev = &auxdev->dev;
312 struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
313 struct sdw_intel *sdw;
314 struct sdw_cdns *cdns;
315 struct sdw_bus *bus;
316 int ret;
317
318 sdw = devm_kzalloc(dev, sizeof(*sdw), GFP_KERNEL);
319 if (!sdw)
320 return -ENOMEM;
321
322 cdns = &sdw->cdns;
323 bus = &cdns->bus;
324
325 sdw->instance = auxdev->id;
326 sdw->link_res = &ldev->link_res;
327 cdns->dev = dev;
328 cdns->registers = sdw->link_res->registers;
329 cdns->ip_offset = sdw->link_res->ip_offset;
330 cdns->instance = sdw->instance;
331 cdns->msg_count = 0;
332
333 /* single controller for all SoundWire links */
334 bus->controller_id = 0;
335
336 bus->link_id = auxdev->id;
337 bus->clk_stop_timeout = 1;
338
339 /*
340 * paranoia check: make sure ACPI-reported number of links is aligned with
341 * hardware capabilities.
342 */
343 ret = sdw_intel_get_link_count(sdw);
344 if (ret < 0) {
345 dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);
346 return ret;
347 }
348 if (ret <= sdw->instance) {
349 dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);
350 return -EINVAL;
351 }
352
353 sdw_cdns_probe(cdns);
354
355 /* Set ops */
356 bus->ops = &sdw_intel_ops;
357
358 /* set driver data, accessed by snd_soc_dai_get_drvdata() */
359 auxiliary_set_drvdata(auxdev, cdns);
360
361 /* use generic bandwidth allocation algorithm */
362 sdw->cdns.bus.compute_params = sdw_compute_params;
363
364 ret = sdw_bus_master_add(bus, dev, dev->fwnode);
365 if (ret) {
366 dev_err(dev, "sdw_bus_master_add fail: %d\n", ret);
367 return ret;
368 }
369
370 if (bus->prop.hw_disabled)
371 dev_info(dev,
372 "SoundWire master %d is disabled, will be ignored\n",
373 bus->link_id);
374 /*
375 * Ignore BIOS err_threshold, it's a really bad idea when dealing
376 * with multiple hardware synchronized links
377 */
378 bus->prop.err_threshold = 0;
379
380 return 0;
381}
382
383int intel_link_startup(struct auxiliary_device *auxdev)
384{
385 struct device *dev = &auxdev->dev;
386 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
387 struct sdw_intel *sdw = cdns_to_intel(cdns);
388 struct sdw_bus *bus = &cdns->bus;
389 int link_flags;
390 bool multi_link;
391 u32 clock_stop_quirks;
392 int ret;
393
394 if (bus->prop.hw_disabled) {
395 dev_info(dev,
396 "SoundWire master %d is disabled, ignoring\n",
397 sdw->instance);
398 return 0;
399 }
400
401 link_flags = md_flags >> (bus->link_id * 8);
402 multi_link = !(link_flags & SDW_INTEL_MASTER_DISABLE_MULTI_LINK);
403 if (!multi_link) {
404 dev_dbg(dev, "Multi-link is disabled\n");
405 } else {
406 /*
407 * hardware-based synchronization is required regardless
408 * of the number of segments used by a stream: SSP-based
409 * synchronization is gated by gsync when the multi-master
410 * mode is set.
411 */
412 bus->hw_sync_min_links = 1;
413 }
414 bus->multi_link = multi_link;
415
416 /* Initialize shim, controller */
417 ret = sdw_intel_link_power_up(sdw);
418 if (ret)
419 goto err_init;
420
421 /* Register DAIs */
422 ret = sdw_intel_register_dai(sdw);
423 if (ret) {
424 dev_err(dev, "DAI registration failed: %d\n", ret);
425 goto err_power_up;
426 }
427
428 sdw_intel_debugfs_init(sdw);
429
430 /* Enable runtime PM */
431 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME)) {
432 pm_runtime_set_autosuspend_delay(dev,
433 INTEL_MASTER_SUSPEND_DELAY_MS);
434 pm_runtime_use_autosuspend(dev);
435 pm_runtime_mark_last_busy(dev);
436
437 pm_runtime_set_active(dev);
438 pm_runtime_enable(dev);
439
440 pm_runtime_resume(bus->dev);
441 }
442
443 /* start bus */
444 ret = sdw_intel_start_bus(sdw);
445 if (ret) {
446 dev_err(dev, "bus start failed: %d\n", ret);
447 goto err_pm_runtime;
448 }
449
450 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
451 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) {
452 /*
453 * To keep the clock running we need to prevent
454 * pm_runtime suspend from happening by increasing the
455 * reference count.
456 * This quirk is specified by the parent PCI device in
457 * case of specific latency requirements. It will have
458 * no effect if pm_runtime is disabled by the user via
459 * a module parameter for testing purposes.
460 */
461 pm_runtime_get_noresume(dev);
462 }
463
464 /*
465 * The runtime PM status of Slave devices is "Unsupported"
466 * until they report as ATTACHED. If they don't, e.g. because
467 * there are no Slave devices populated or if the power-on is
468 * delayed or dependent on a power switch, the Master will
469 * remain active and prevent its parent from suspending.
470 *
471 * Conditionally force the pm_runtime core to re-evaluate the
472 * Master status in the absence of any Slave activity. A quirk
473 * is provided to e.g. deal with Slaves that may be powered on
474 * with a delay. A more complete solution would require the
475 * definition of Master properties.
476 */
477 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE)) {
478 pm_runtime_mark_last_busy(bus->dev);
479 pm_runtime_mark_last_busy(dev);
480 pm_runtime_idle(dev);
481 }
482
483 sdw->startup_done = true;
484 return 0;
485
486err_pm_runtime:
487 if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME))
488 pm_runtime_disable(dev);
489err_power_up:
490 sdw_intel_link_power_down(sdw);
491err_init:
492 return ret;
493}
494
495static void intel_link_remove(struct auxiliary_device *auxdev)
496{
497 struct sdw_cdns *cdns = auxiliary_get_drvdata(auxdev);
498 struct sdw_intel *sdw = cdns_to_intel(cdns);
499 struct sdw_bus *bus = &cdns->bus;
500
501 /*
502 * Since pm_runtime is already disabled, we don't decrease
503 * the refcount when the clock_stop_quirk is
504 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
505 */
506 if (!bus->prop.hw_disabled) {
507 sdw_intel_debugfs_exit(sdw);
508 cancel_delayed_work_sync(&cdns->attach_dwork);
509 sdw_cdns_enable_interrupt(cdns, false);
510 }
511 sdw_bus_master_delete(bus);
512}
513
514int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
515{
516 struct device *dev = &auxdev->dev;
517 struct sdw_intel *sdw;
518 struct sdw_bus *bus;
519
520 sdw = auxiliary_get_drvdata(auxdev);
521 bus = &sdw->cdns.bus;
522
523 if (bus->prop.hw_disabled || !sdw->startup_done) {
524 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
525 bus->link_id);
526 return 0;
527 }
528
529 if (!sdw_intel_shim_check_wake(sdw))
530 return 0;
531
532 /* disable WAKEEN interrupt ASAP to prevent interrupt flood */
533 sdw_intel_shim_wake(sdw, false);
534
535 /*
536 * resume the Master, which will generate a bus reset and result in
537 * Slaves re-attaching and be re-enumerated. The SoundWire physical
538 * device which generated the wake will trigger an interrupt, which
539 * will in turn cause the corresponding Linux Slave device to be
540 * resumed and the Slave codec driver to check the status.
541 */
542 pm_request_resume(dev);
543
544 return 0;
545}
546
547/*
548 * PM calls
549 */
550
551int intel_resume_child_device(struct device *dev, void *data)
552{
553 int ret;
554 struct sdw_slave *slave = dev_to_sdw_dev(dev);
555
556 if (!slave->probed) {
557 dev_dbg(dev, "skipping device, no probed driver\n");
558 return 0;
559 }
560 if (!slave->dev_num_sticky) {
561 dev_dbg(dev, "skipping device, never detected on bus\n");
562 return 0;
563 }
564
565 ret = pm_runtime_resume(dev);
566 if (ret < 0) {
567 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
568 return ret;
569 }
570
571 return 0;
572}
573
574static int __maybe_unused intel_pm_prepare(struct device *dev)
575{
576 struct sdw_cdns *cdns = dev_get_drvdata(dev);
577 struct sdw_intel *sdw = cdns_to_intel(cdns);
578 struct sdw_bus *bus = &cdns->bus;
579 u32 clock_stop_quirks;
580 int ret;
581
582 if (bus->prop.hw_disabled || !sdw->startup_done) {
583 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
584 bus->link_id);
585 return 0;
586 }
587
588 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
589
590 if (pm_runtime_suspended(dev) &&
591 pm_runtime_suspended(dev->parent) &&
592 ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
593 !clock_stop_quirks)) {
594 /*
595 * if we've enabled clock stop, and the parent is suspended, the SHIM registers
596 * are not accessible and the shim wake cannot be disabled.
597 * The only solution is to resume the entire bus to full power
598 */
599
600 /*
601 * If any operation in this block fails, we keep going since we don't want
602 * to prevent system suspend from happening and errors should be recoverable
603 * on resume.
604 */
605
606 /*
607 * first resume the device for this link. This will also by construction
608 * resume the PCI parent device.
609 */
610 ret = pm_runtime_resume(dev);
611 if (ret < 0) {
612 dev_err(dev, "%s: pm_runtime_resume failed: %d\n", __func__, ret);
613 return 0;
614 }
615
616 /*
617 * Continue resuming the entire bus (parent + child devices) to exit
618 * the clock stop mode. If there are no devices connected on this link
619 * this is a no-op.
620 * The resume to full power could have been implemented with a .prepare
621 * step in SoundWire codec drivers. This would however require a lot
622 * of code to handle an Intel-specific corner case. It is simpler in
623 * practice to add a loop at the link level.
624 */
625 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
626
627 if (ret < 0)
628 dev_err(dev, "%s: intel_resume_child_device failed: %d\n", __func__, ret);
629 }
630
631 return 0;
632}
633
634static int __maybe_unused intel_suspend(struct device *dev)
635{
636 struct sdw_cdns *cdns = dev_get_drvdata(dev);
637 struct sdw_intel *sdw = cdns_to_intel(cdns);
638 struct sdw_bus *bus = &cdns->bus;
639 u32 clock_stop_quirks;
640 int ret;
641
642 if (bus->prop.hw_disabled || !sdw->startup_done) {
643 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
644 bus->link_id);
645 return 0;
646 }
647
648 /* Prevent runtime PM from racing with the code below. */
649 pm_runtime_disable(dev);
650
651 if (pm_runtime_status_suspended(dev)) {
652 dev_dbg(dev, "pm_runtime status: suspended\n");
653
654 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
655
656 if ((clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) ||
657 !clock_stop_quirks) {
658
659 if (pm_runtime_status_suspended(dev->parent)) {
660 /*
661 * paranoia check: this should not happen with the .prepare
662 * resume to full power
663 */
664 dev_err(dev, "%s: invalid config: parent is suspended\n", __func__);
665 } else {
666 sdw_intel_shim_wake(sdw, false);
667 }
668 }
669
670 return 0;
671 }
672
673 ret = sdw_intel_stop_bus(sdw, false);
674 if (ret < 0) {
675 dev_err(dev, "%s: cannot stop bus: %d\n", __func__, ret);
676 return ret;
677 }
678
679 return 0;
680}
681
682static int __maybe_unused intel_suspend_runtime(struct device *dev)
683{
684 struct sdw_cdns *cdns = dev_get_drvdata(dev);
685 struct sdw_intel *sdw = cdns_to_intel(cdns);
686 struct sdw_bus *bus = &cdns->bus;
687 u32 clock_stop_quirks;
688 int ret;
689
690 if (bus->prop.hw_disabled || !sdw->startup_done) {
691 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
692 bus->link_id);
693 return 0;
694 }
695
696 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
697
698 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
699 ret = sdw_intel_stop_bus(sdw, false);
700 if (ret < 0) {
701 dev_err(dev, "%s: cannot stop bus during teardown: %d\n",
702 __func__, ret);
703 return ret;
704 }
705 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET || !clock_stop_quirks) {
706 ret = sdw_intel_stop_bus(sdw, true);
707 if (ret < 0) {
708 dev_err(dev, "%s: cannot stop bus during clock_stop: %d\n",
709 __func__, ret);
710 return ret;
711 }
712 } else {
713 dev_err(dev, "%s clock_stop_quirks %x unsupported\n",
714 __func__, clock_stop_quirks);
715 ret = -EINVAL;
716 }
717
718 return ret;
719}
720
721static int __maybe_unused intel_resume(struct device *dev)
722{
723 struct sdw_cdns *cdns = dev_get_drvdata(dev);
724 struct sdw_intel *sdw = cdns_to_intel(cdns);
725 struct sdw_bus *bus = &cdns->bus;
726 int ret;
727
728 if (bus->prop.hw_disabled || !sdw->startup_done) {
729 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
730 bus->link_id);
731 return 0;
732 }
733
734 ret = sdw_intel_link_power_up(sdw);
735 if (ret) {
736 dev_err(dev, "%s failed: %d\n", __func__, ret);
737 return ret;
738 }
739
740 /*
741 * make sure all Slaves are tagged as UNATTACHED and provide
742 * reason for reinitialization
743 */
744 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
745
746 ret = sdw_intel_start_bus(sdw);
747 if (ret < 0) {
748 dev_err(dev, "cannot start bus during resume\n");
749 sdw_intel_link_power_down(sdw);
750 return ret;
751 }
752
753 /*
754 * Runtime PM has been disabled in intel_suspend(), so set the status
755 * to active because the device has just been resumed and re-enable
756 * runtime PM.
757 */
758 pm_runtime_set_active(dev);
759 pm_runtime_enable(dev);
760
761 /*
762 * after system resume, the pm_runtime suspend() may kick in
763 * during the enumeration, before any children device force the
764 * master device to remain active. Using pm_runtime_get()
765 * routines is not really possible, since it'd prevent the
766 * master from suspending.
767 * A reasonable compromise is to update the pm_runtime
768 * counters and delay the pm_runtime suspend by several
769 * seconds, by when all enumeration should be complete.
770 */
771 pm_runtime_mark_last_busy(bus->dev);
772 pm_runtime_mark_last_busy(dev);
773
774 return 0;
775}
776
777static int __maybe_unused intel_resume_runtime(struct device *dev)
778{
779 struct sdw_cdns *cdns = dev_get_drvdata(dev);
780 struct sdw_intel *sdw = cdns_to_intel(cdns);
781 struct sdw_bus *bus = &cdns->bus;
782 u32 clock_stop_quirks;
783 int ret;
784
785 if (bus->prop.hw_disabled || !sdw->startup_done) {
786 dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
787 bus->link_id);
788 return 0;
789 }
790
791 /* unconditionally disable WAKEEN interrupt */
792 sdw_intel_shim_wake(sdw, false);
793
794 clock_stop_quirks = sdw->link_res->clock_stop_quirks;
795
796 if (clock_stop_quirks & SDW_INTEL_CLK_STOP_TEARDOWN) {
797 ret = sdw_intel_link_power_up(sdw);
798 if (ret) {
799 dev_err(dev, "%s: power_up failed after teardown: %d\n", __func__, ret);
800 return ret;
801 }
802
803 /*
804 * make sure all Slaves are tagged as UNATTACHED and provide
805 * reason for reinitialization
806 */
807 sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET);
808
809 ret = sdw_intel_start_bus(sdw);
810 if (ret < 0) {
811 dev_err(dev, "%s: cannot start bus after teardown: %d\n", __func__, ret);
812 sdw_intel_link_power_down(sdw);
813 return ret;
814 }
815
816 } else if (clock_stop_quirks & SDW_INTEL_CLK_STOP_BUS_RESET) {
817 ret = sdw_intel_link_power_up(sdw);
818 if (ret) {
819 dev_err(dev, "%s: power_up failed after bus reset: %d\n", __func__, ret);
820 return ret;
821 }
822
823 ret = sdw_intel_start_bus_after_reset(sdw);
824 if (ret < 0) {
825 dev_err(dev, "%s: cannot start bus after reset: %d\n", __func__, ret);
826 sdw_intel_link_power_down(sdw);
827 return ret;
828 }
829 } else if (!clock_stop_quirks) {
830
831 sdw_intel_check_clock_stop(sdw);
832
833 ret = sdw_intel_link_power_up(sdw);
834 if (ret) {
835 dev_err(dev, "%s: power_up failed: %d\n", __func__, ret);
836 return ret;
837 }
838
839 ret = sdw_intel_start_bus_after_clock_stop(sdw);
840 if (ret < 0) {
841 dev_err(dev, "%s: cannot start bus after clock stop: %d\n", __func__, ret);
842 sdw_intel_link_power_down(sdw);
843 return ret;
844 }
845 } else {
846 dev_err(dev, "%s: clock_stop_quirks %x unsupported\n",
847 __func__, clock_stop_quirks);
848 ret = -EINVAL;
849 }
850
851 return ret;
852}
853
854static const struct dev_pm_ops intel_pm = {
855 .prepare = intel_pm_prepare,
856 SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume)
857 SET_RUNTIME_PM_OPS(intel_suspend_runtime, intel_resume_runtime, NULL)
858};
859
860static const struct auxiliary_device_id intel_link_id_table[] = {
861 { .name = "soundwire_intel.link" },
862 {},
863};
864MODULE_DEVICE_TABLE(auxiliary, intel_link_id_table);
865
866static struct auxiliary_driver sdw_intel_drv = {
867 .probe = intel_link_probe,
868 .remove = intel_link_remove,
869 .driver = {
870 /* auxiliary_driver_register() sets .name to be the modname */
871 .pm = &intel_pm,
872 },
873 .id_table = intel_link_id_table
874};
875module_auxiliary_driver(sdw_intel_drv);
876
877MODULE_LICENSE("Dual BSD/GPL");
878MODULE_DESCRIPTION("Intel Soundwire Link Driver");