1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // rt712-sdca-sdw.c -- rt712 SDCA ALSA SoC audio driver
4 //
5 // Copyright(c) 2023 Realtek Semiconductor Corp.
6 //
7 //
8 
9 #include <linux/delay.h>
10 #include <linux/device.h>
11 #include <linux/mod_devicetable.h>
12 #include <linux/module.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/soundwire/sdw_registers.h>
15 #include "rt712-sdca.h"
16 #include "rt712-sdca-sdw.h"
17 
18 static bool rt712_sdca_readable_register(struct device *dev, unsigned int reg)
19 {
20 	switch (reg) {
21 	case 0x201a ... 0x201f:
22 	case 0x2029 ... 0x202a:
23 	case 0x202d ... 0x2034:
24 	case 0x2230 ... 0x2232:
25 	case 0x2f01 ... 0x2f0a:
26 	case 0x2f35 ... 0x2f36:
27 	case 0x2f50:
28 	case 0x2f54:
29 	case 0x2f58 ... 0x2f5d:
30 	case 0x3201:
31 	case 0x320c:
32 	case 0x3301 ... 0x3303:
33 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_SELECTED_MODE, 0):
34 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_DETECTED_MODE, 0):
35 	case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_CURRENT_OWNER, 0) ...
36 		SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_MESSAGE_LENGTH, 0):
37 	case RT712_BUF_ADDR_HID1 ... RT712_BUF_ADDR_HID2:
38 		return true;
39 	default:
40 		return false;
41 	}
42 }
43 
44 static bool rt712_sdca_volatile_register(struct device *dev, unsigned int reg)
45 {
46 	switch (reg) {
47 	case 0x201b:
48 	case 0x201c:
49 	case 0x201d:
50 	case 0x201f:
51 	case 0x202d ... 0x202f:
52 	case 0x2230:
53 	case 0x2f01:
54 	case 0x2f35:
55 	case 0x320c:
56 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_GE49, RT712_SDCA_CTL_DETECTED_MODE, 0):
57 	case SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_CURRENT_OWNER, 0) ...
58 		SDW_SDCA_CTL(FUNC_NUM_HID, RT712_SDCA_ENT_HID01, RT712_SDCA_CTL_HIDTX_MESSAGE_LENGTH, 0):
59 	case RT712_BUF_ADDR_HID1 ... RT712_BUF_ADDR_HID2:
60 		return true;
61 	default:
62 		return false;
63 	}
64 }
65 
66 static bool rt712_sdca_mbq_readable_register(struct device *dev, unsigned int reg)
67 {
68 	switch (reg) {
69 	case 0x2000000 ... 0x200008e:
70 	case 0x5300000 ... 0x530000e:
71 	case 0x5400000 ... 0x540000e:
72 	case 0x5600000 ... 0x5600008:
73 	case 0x5700000 ... 0x570000d:
74 	case 0x5800000 ... 0x5800021:
75 	case 0x5900000 ... 0x5900028:
76 	case 0x5a00000 ... 0x5a00009:
77 	case 0x5b00000 ... 0x5b00051:
78 	case 0x5c00000 ... 0x5c0009a:
79 	case 0x5d00000 ... 0x5d00009:
80 	case 0x5f00000 ... 0x5f00030:
81 	case 0x6100000 ... 0x6100068:
82 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU05, RT712_SDCA_CTL_FU_VOLUME, CH_L):
83 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU05, RT712_SDCA_CTL_FU_VOLUME, CH_R):
84 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU0F, RT712_SDCA_CTL_FU_VOLUME, CH_L):
85 	case SDW_SDCA_CTL(FUNC_NUM_JACK_CODEC, RT712_SDCA_ENT_USER_FU0F, RT712_SDCA_CTL_FU_VOLUME, CH_R):
86 	case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT_USER_FU06, RT712_SDCA_CTL_FU_VOLUME, CH_L):
87 	case SDW_SDCA_CTL(FUNC_NUM_AMP, RT712_SDCA_ENT_USER_FU06, RT712_SDCA_CTL_FU_VOLUME, CH_R):
88 		return true;
89 	default:
90 		return false;
91 	}
92 }
93 
94 static bool rt712_sdca_mbq_volatile_register(struct device *dev, unsigned int reg)
95 {
96 	switch (reg) {
97 	case 0x2000000:
98 	case 0x200001a:
99 	case 0x2000024:
100 	case 0x2000046:
101 	case 0x200008a:
102 	case 0x5800000:
103 	case 0x5800001:
104 	case 0x6100008:
105 		return true;
106 	default:
107 		return false;
108 	}
109 }
110 
111 static const struct regmap_config rt712_sdca_regmap = {
112 	.reg_bits = 32,
113 	.val_bits = 8,
114 	.readable_reg = rt712_sdca_readable_register,
115 	.volatile_reg = rt712_sdca_volatile_register,
116 	.max_register = 0x44ffffff,
117 	.reg_defaults = rt712_sdca_reg_defaults,
118 	.num_reg_defaults = ARRAY_SIZE(rt712_sdca_reg_defaults),
119 	.cache_type = REGCACHE_MAPLE,
120 	.use_single_read = true,
121 	.use_single_write = true,
122 };
123 
124 static const struct regmap_config rt712_sdca_mbq_regmap = {
125 	.name = "sdw-mbq",
126 	.reg_bits = 32,
127 	.val_bits = 16,
128 	.readable_reg = rt712_sdca_mbq_readable_register,
129 	.volatile_reg = rt712_sdca_mbq_volatile_register,
130 	.max_register = 0x41000312,
131 	.reg_defaults = rt712_sdca_mbq_defaults,
132 	.num_reg_defaults = ARRAY_SIZE(rt712_sdca_mbq_defaults),
133 	.cache_type = REGCACHE_MAPLE,
134 	.use_single_read = true,
135 	.use_single_write = true,
136 };
137 
138 static int rt712_sdca_update_status(struct sdw_slave *slave,
139 				enum sdw_slave_status status)
140 {
141 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
142 
143 	if (status == SDW_SLAVE_UNATTACHED)
144 		rt712->hw_init = false;
145 
146 	if (status == SDW_SLAVE_ATTACHED) {
147 		if (rt712->hs_jack) {
148 			/*
149 			 * Due to the SCP_SDCA_INTMASK will be cleared by any reset, and then
150 			 * if the device attached again, we will need to set the setting back.
151 			 * It could avoid losing the jack detection interrupt.
152 			 * This also could sync with the cache value as the rt712_sdca_jack_init set.
153 			 */
154 			sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INTMASK1,
155 				SDW_SCP_SDCA_INTMASK_SDCA_0);
156 			sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INTMASK2,
157 				SDW_SCP_SDCA_INTMASK_SDCA_8);
158 		}
159 	}
160 
161 	/*
162 	 * Perform initialization only if slave status is present and
163 	 * hw_init flag is false
164 	 */
165 	if (rt712->hw_init || status != SDW_SLAVE_ATTACHED)
166 		return 0;
167 
168 	/* perform I/O transfers required for Slave initialization */
169 	return rt712_sdca_io_init(&slave->dev, slave);
170 }
171 
172 static int rt712_sdca_read_prop(struct sdw_slave *slave)
173 {
174 	struct sdw_slave_prop *prop = &slave->prop;
175 	int nval;
176 	int i, j;
177 	u32 bit;
178 	unsigned long addr;
179 	struct sdw_dpn_prop *dpn;
180 
181 	prop->scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY;
182 	prop->quirks = SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY;
183 
184 	prop->paging_support = true;
185 
186 	/* first we need to allocate memory for set bits in port lists */
187 	prop->source_ports = BIT(4); /* BITMAP: 00010000 */
188 	prop->sink_ports = BIT(3) | BIT(1); /* BITMAP:  00001010 */
189 
190 	nval = hweight32(prop->source_ports);
191 	prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
192 		sizeof(*prop->src_dpn_prop), GFP_KERNEL);
193 	if (!prop->src_dpn_prop)
194 		return -ENOMEM;
195 
196 	i = 0;
197 	dpn = prop->src_dpn_prop;
198 	addr = prop->source_ports;
199 	for_each_set_bit(bit, &addr, 32) {
200 		dpn[i].num = bit;
201 		dpn[i].type = SDW_DPN_FULL;
202 		dpn[i].simple_ch_prep_sm = true;
203 		dpn[i].ch_prep_timeout = 10;
204 		i++;
205 	}
206 
207 	/* do this again for sink now */
208 	nval = hweight32(prop->sink_ports);
209 	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
210 		sizeof(*prop->sink_dpn_prop), GFP_KERNEL);
211 	if (!prop->sink_dpn_prop)
212 		return -ENOMEM;
213 
214 	j = 0;
215 	dpn = prop->sink_dpn_prop;
216 	addr = prop->sink_ports;
217 	for_each_set_bit(bit, &addr, 32) {
218 		dpn[j].num = bit;
219 		dpn[j].type = SDW_DPN_FULL;
220 		dpn[j].simple_ch_prep_sm = true;
221 		dpn[j].ch_prep_timeout = 10;
222 		j++;
223 	}
224 
225 	/* set the timeout values */
226 	prop->clk_stop_timeout = 1380;
227 
228 	/* wake-up event */
229 	prop->wake_capable = 1;
230 
231 	return 0;
232 }
233 
234 static int rt712_sdca_interrupt_callback(struct sdw_slave *slave,
235 					struct sdw_slave_intr_status *status)
236 {
237 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
238 	int ret, stat;
239 	int count = 0, retry = 3;
240 	unsigned int sdca_cascade, scp_sdca_stat1, scp_sdca_stat2 = 0;
241 
242 	dev_dbg(&slave->dev,
243 		"%s control_port_stat=%x, sdca_cascade=%x", __func__,
244 		status->control_port, status->sdca_cascade);
245 
246 	if (cancel_delayed_work_sync(&rt712->jack_detect_work)) {
247 		dev_warn(&slave->dev, "%s the pending delayed_work was cancelled", __func__);
248 		/* avoid the HID owner doesn't change to device */
249 		if (rt712->scp_sdca_stat2)
250 			scp_sdca_stat2 = rt712->scp_sdca_stat2;
251 	}
252 
253 	/*
254 	 * The critical section below intentionally protects a rather large piece of code.
255 	 * We don't want to allow the system suspend to disable an interrupt while we are
256 	 * processing it, which could be problematic given the quirky SoundWire interrupt
257 	 * scheme. We do want however to prevent new workqueues from being scheduled if
258 	 * the disable_irq flag was set during system suspend.
259 	 */
260 	mutex_lock(&rt712->disable_irq_lock);
261 
262 	ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
263 	if (ret < 0)
264 		goto io_error;
265 	rt712->scp_sdca_stat1 = ret;
266 	ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
267 	if (ret < 0)
268 		goto io_error;
269 	rt712->scp_sdca_stat2 = ret;
270 	if (scp_sdca_stat2)
271 		rt712->scp_sdca_stat2 |= scp_sdca_stat2;
272 
273 	do {
274 		/* clear flag */
275 		ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
276 		if (ret < 0)
277 			goto io_error;
278 		if (ret & SDW_SCP_SDCA_INTMASK_SDCA_0) {
279 			ret = sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INT1,
280 						SDW_SCP_SDCA_INTMASK_SDCA_0);
281 			if (ret < 0)
282 				goto io_error;
283 		}
284 		ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
285 		if (ret < 0)
286 			goto io_error;
287 		if (ret & SDW_SCP_SDCA_INTMASK_SDCA_8) {
288 			ret = sdw_write_no_pm(rt712->slave, SDW_SCP_SDCA_INT2,
289 						SDW_SCP_SDCA_INTMASK_SDCA_8);
290 			if (ret < 0)
291 				goto io_error;
292 		}
293 
294 		/* check if flag clear or not */
295 		ret = sdw_read_no_pm(rt712->slave, SDW_DP0_INT);
296 		if (ret < 0)
297 			goto io_error;
298 		sdca_cascade = ret & SDW_DP0_SDCA_CASCADE;
299 
300 		ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT1);
301 		if (ret < 0)
302 			goto io_error;
303 		scp_sdca_stat1 = ret & SDW_SCP_SDCA_INTMASK_SDCA_0;
304 
305 		ret = sdw_read_no_pm(rt712->slave, SDW_SCP_SDCA_INT2);
306 		if (ret < 0)
307 			goto io_error;
308 		scp_sdca_stat2 = ret & SDW_SCP_SDCA_INTMASK_SDCA_8;
309 
310 		stat = scp_sdca_stat1 || scp_sdca_stat2 || sdca_cascade;
311 
312 		count++;
313 	} while (stat != 0 && count < retry);
314 
315 	if (stat)
316 		dev_warn(&slave->dev,
317 			"%s scp_sdca_stat1=0x%x, scp_sdca_stat2=0x%x\n", __func__,
318 			rt712->scp_sdca_stat1, rt712->scp_sdca_stat2);
319 
320 	if (status->sdca_cascade && !rt712->disable_irq)
321 		mod_delayed_work(system_power_efficient_wq,
322 			&rt712->jack_detect_work, msecs_to_jiffies(30));
323 
324 	mutex_unlock(&rt712->disable_irq_lock);
325 
326 	return 0;
327 
328 io_error:
329 	mutex_unlock(&rt712->disable_irq_lock);
330 	pr_err_ratelimited("IO error in %s, ret %d\n", __func__, ret);
331 	return ret;
332 }
333 
334 static struct sdw_slave_ops rt712_sdca_slave_ops = {
335 	.read_prop = rt712_sdca_read_prop,
336 	.interrupt_callback = rt712_sdca_interrupt_callback,
337 	.update_status = rt712_sdca_update_status,
338 };
339 
340 static int rt712_sdca_sdw_probe(struct sdw_slave *slave,
341 				const struct sdw_device_id *id)
342 {
343 	struct regmap *regmap, *mbq_regmap;
344 
345 	/* Regmap Initialization */
346 	mbq_regmap = devm_regmap_init_sdw_mbq(slave, &rt712_sdca_mbq_regmap);
347 	if (IS_ERR(mbq_regmap))
348 		return PTR_ERR(mbq_regmap);
349 
350 	regmap = devm_regmap_init_sdw(slave, &rt712_sdca_regmap);
351 	if (IS_ERR(regmap))
352 		return PTR_ERR(regmap);
353 
354 	return rt712_sdca_init(&slave->dev, regmap, mbq_regmap, slave);
355 }
356 
357 static int rt712_sdca_sdw_remove(struct sdw_slave *slave)
358 {
359 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(&slave->dev);
360 
361 	if (rt712->hw_init) {
362 		cancel_delayed_work_sync(&rt712->jack_detect_work);
363 		cancel_delayed_work_sync(&rt712->jack_btn_check_work);
364 	}
365 
366 	if (rt712->first_hw_init)
367 		pm_runtime_disable(&slave->dev);
368 
369 	mutex_destroy(&rt712->calibrate_mutex);
370 	mutex_destroy(&rt712->disable_irq_lock);
371 
372 	return 0;
373 }
374 
375 static const struct sdw_device_id rt712_sdca_id[] = {
376 	SDW_SLAVE_ENTRY_EXT(0x025d, 0x712, 0x3, 0x1, 0),
377 	SDW_SLAVE_ENTRY_EXT(0x025d, 0x713, 0x3, 0x1, 0),
378 	SDW_SLAVE_ENTRY_EXT(0x025d, 0x716, 0x3, 0x1, 0),
379 	SDW_SLAVE_ENTRY_EXT(0x025d, 0x717, 0x3, 0x1, 0),
380 	{},
381 };
382 MODULE_DEVICE_TABLE(sdw, rt712_sdca_id);
383 
384 static int __maybe_unused rt712_sdca_dev_suspend(struct device *dev)
385 {
386 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(dev);
387 
388 	if (!rt712->hw_init)
389 		return 0;
390 
391 	cancel_delayed_work_sync(&rt712->jack_detect_work);
392 	cancel_delayed_work_sync(&rt712->jack_btn_check_work);
393 
394 	regcache_cache_only(rt712->regmap, true);
395 	regcache_cache_only(rt712->mbq_regmap, true);
396 
397 	return 0;
398 }
399 
400 static int __maybe_unused rt712_sdca_dev_system_suspend(struct device *dev)
401 {
402 	struct rt712_sdca_priv *rt712_sdca = dev_get_drvdata(dev);
403 	struct sdw_slave *slave = dev_to_sdw_dev(dev);
404 	int ret1, ret2;
405 
406 	if (!rt712_sdca->hw_init)
407 		return 0;
408 
409 	/*
410 	 * prevent new interrupts from being handled after the
411 	 * deferred work completes and before the parent disables
412 	 * interrupts on the link
413 	 */
414 	mutex_lock(&rt712_sdca->disable_irq_lock);
415 	rt712_sdca->disable_irq = true;
416 	ret1 = sdw_update_no_pm(slave, SDW_SCP_SDCA_INTMASK1,
417 				SDW_SCP_SDCA_INTMASK_SDCA_0, 0);
418 	ret2 = sdw_update_no_pm(slave, SDW_SCP_SDCA_INTMASK2,
419 				SDW_SCP_SDCA_INTMASK_SDCA_8, 0);
420 	mutex_unlock(&rt712_sdca->disable_irq_lock);
421 
422 	if (ret1 < 0 || ret2 < 0) {
423 		/* log but don't prevent suspend from happening */
424 		dev_dbg(&slave->dev, "%s: could not disable SDCA interrupts\n:", __func__);
425 	}
426 
427 	return rt712_sdca_dev_suspend(dev);
428 }
429 
430 #define RT712_PROBE_TIMEOUT 5000
431 
432 static int __maybe_unused rt712_sdca_dev_resume(struct device *dev)
433 {
434 	struct sdw_slave *slave = dev_to_sdw_dev(dev);
435 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(dev);
436 	unsigned long time;
437 
438 	if (!rt712->first_hw_init)
439 		return 0;
440 
441 	if (!slave->unattach_request)
442 		goto regmap_sync;
443 
444 	time = wait_for_completion_timeout(&slave->initialization_complete,
445 				msecs_to_jiffies(RT712_PROBE_TIMEOUT));
446 	if (!time) {
447 		dev_err(&slave->dev, "Initialization not complete, timed out\n");
448 		sdw_show_ping_status(slave->bus, true);
449 
450 		return -ETIMEDOUT;
451 	}
452 
453 regmap_sync:
454 	slave->unattach_request = 0;
455 	regcache_cache_only(rt712->regmap, false);
456 	regcache_sync(rt712->regmap);
457 	regcache_cache_only(rt712->mbq_regmap, false);
458 	regcache_sync(rt712->mbq_regmap);
459 	return 0;
460 }
461 
462 static const struct dev_pm_ops rt712_sdca_pm = {
463 	SET_SYSTEM_SLEEP_PM_OPS(rt712_sdca_dev_system_suspend, rt712_sdca_dev_resume)
464 	SET_RUNTIME_PM_OPS(rt712_sdca_dev_suspend, rt712_sdca_dev_resume, NULL)
465 };
466 
467 static struct sdw_driver rt712_sdca_sdw_driver = {
468 	.driver = {
469 		.name = "rt712-sdca",
470 		.owner = THIS_MODULE,
471 		.pm = &rt712_sdca_pm,
472 	},
473 	.probe = rt712_sdca_sdw_probe,
474 	.remove = rt712_sdca_sdw_remove,
475 	.ops = &rt712_sdca_slave_ops,
476 	.id_table = rt712_sdca_id,
477 };
478 module_sdw_driver(rt712_sdca_sdw_driver);
479 
480 MODULE_DESCRIPTION("ASoC RT712 SDCA SDW driver");
481 MODULE_AUTHOR("Shuming Fan <shumingf@realtek.com>");
482 MODULE_LICENSE("GPL");
483