summaryrefslogtreecommitdiffstats
path: root/drivers/soundwire/intel_init.c
blob: a09134b97cd6667b0b5f6471cdff329cc1148ca4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.

/*
 * SDW Intel Init Routines
 *
 * Initializes and creates SDW devices based on ACPI and Hardware values
 */

#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/auxiliary_bus.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_intel.h>
#include "cadence_master.h"
#include "bus.h"
#include "intel.h"
#include "intel_auxdevice.h"

static void intel_link_dev_release(struct device *dev)
{
	struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
	struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);

	kfree(ldev);
}

/* alloc, init and add link devices */
static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res,
							  struct sdw_intel_ctx *ctx,
							  struct fwnode_handle *fwnode,
							  const char *name,
							  int link_id)
{
	struct sdw_intel_link_dev *ldev;
	struct sdw_intel_link_res *link;
	struct auxiliary_device *auxdev;
	int ret;

	ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
	if (!ldev)
		return ERR_PTR(-ENOMEM);

	auxdev = &ldev->auxdev;
	auxdev->name = name;
	auxdev->dev.parent = res->parent;
	auxdev->dev.fwnode = fwnode;
	auxdev->dev.release = intel_link_dev_release;

	/* we don't use an IDA since we already have a link ID */
	auxdev->id = link_id;

	/*
	 * keep a handle on the allocated memory, to be used in all other functions.
	 * Since the same pattern is used to skip links that are not enabled, there is
	 * no need to check if ctx->ldev[i] is NULL later on.
	 */
	ctx->ldev[link_id] = ldev;

	/* Add link information used in the driver probe */
	link = &ldev->link_res;
	link->hw_ops = res->hw_ops;
	link->mmio_base = res->mmio_base;
	if (!res->ext) {
		link->registers = res->mmio_base + SDW_LINK_BASE
			+ (SDW_LINK_SIZE * link_id);
		link->ip_offset = 0;
		link->shim = res->mmio_base + res->shim_base;
		link->alh = res->mmio_base + res->alh_base;
		link->shim_lock = &ctx->shim_lock;
	} else {
		link->registers = res->mmio_base + SDW_IP_BASE(link_id);
		link->ip_offset = SDW_CADENCE_MCP_IP_OFFSET;
		link->shim = res->mmio_base +  SDW_SHIM2_GENERIC_BASE(link_id);
		link->shim_vs = res->mmio_base + SDW_SHIM2_VS_BASE(link_id);
		link->shim_lock = res->eml_lock;
	}

	link->ops = res->ops;
	link->dev = res->dev;

	link->clock_stop_quirks = res->clock_stop_quirks;
	link->shim_mask = &ctx->shim_mask;
	link->link_mask = ctx->link_mask;

	link->hbus = res->hbus;

	/* now follow the two-step init/add sequence */
	ret = auxiliary_device_init(auxdev);
	if (ret < 0) {
		dev_err(res->parent, "failed to initialize link dev %s link_id %d\n",
			name, link_id);
		kfree(ldev);
		return ERR_PTR(ret);
	}

	ret = auxiliary_device_add(&ldev->auxdev);
	if (ret < 0) {
		dev_err(res->parent, "failed to add link dev %s link_id %d\n",
			ldev->auxdev.name, link_id);
		/* ldev will be freed with the put_device() and .release sequence */
		auxiliary_device_uninit(&ldev->auxdev);
		return ERR_PTR(ret);
	}

	return ldev;
}

static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev)
{
	auxiliary_device_delete(&ldev->auxdev);
	auxiliary_device_uninit(&ldev->auxdev);
}

static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
{
	struct sdw_intel_link_dev *ldev;
	u32 link_mask;
	int i;

	link_mask = ctx->link_mask;

	for (i = 0; i < ctx->count; i++) {
		if (!(link_mask & BIT(i)))
			continue;

		ldev = ctx->ldev[i];

		pm_runtime_disable(&ldev->auxdev.dev);
		if (!ldev->link_res.clock_stop_quirks)
			pm_runtime_put_noidle(ldev->link_res.dev);

		intel_link_dev_unregister(ldev);
	}

	return 0;
}

irqreturn_t sdw_intel_thread(int irq, void *dev_id)
{
	struct sdw_intel_ctx *ctx = dev_id;
	struct sdw_intel_link_res *link;

	list_for_each_entry(link, &ctx->link_list, list)
		sdw_cdns_irq(irq, link->cdns);

	return IRQ_HANDLED;
}
EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT);

static struct sdw_intel_ctx
*sdw_intel_probe_controller(struct sdw_intel_res *res)
{
	struct sdw_intel_link_res *link;
	struct sdw_intel_link_dev *ldev;
	struct sdw_intel_ctx *ctx;
	struct acpi_device *adev;
	struct sdw_slave *slave;
	struct list_head *node;
	struct sdw_bus *bus;
	u32 link_mask;
	int num_slaves = 0;
	int count;
	int i;

	if (!res)
		return NULL;

	adev = acpi_fetch_acpi_dev(res->handle);
	if (!adev)
		return NULL;

	if (!res->count)
		return NULL;

	count = res->count;
	dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);

	/*
	 * we need to alloc/free memory manually and can't use devm:
	 * this routine may be called from a workqueue, and not from
	 * the parent .probe.
	 * If devm_ was used, the memory might never be freed on errors.
	 */
	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return NULL;

	ctx->count = count;

	/*
	 * allocate the array of pointers. The link-specific data is allocated
	 * as part of the first loop below and released with the auxiliary_device_uninit().
	 * If some links are disabled, the link pointer will remain NULL. Given that the
	 * number of links is small, this is simpler than using a list to keep track of links.
	 */
	ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL);
	if (!ctx->ldev) {
		kfree(ctx);
		return NULL;
	}

	ctx->mmio_base = res->mmio_base;
	ctx->shim_base = res->shim_base;
	ctx->alh_base = res->alh_base;
	ctx->link_mask = res->link_mask;
	ctx->handle = res->handle;
	mutex_init(&ctx->shim_lock);

	link_mask = ctx->link_mask;

	INIT_LIST_HEAD(&ctx->link_list);

	for (i = 0; i < count; i++) {
		if (!(link_mask & BIT(i)))
			continue;

		/*
		 * init and add a device for each link
		 *
		 * The name of the device will be soundwire_intel.link.[i],
		 * with the "soundwire_intel" module prefix automatically added
		 * by the auxiliary bus core.
		 */
		ldev = intel_link_dev_register(res,
					       ctx,
					       acpi_fwnode_handle(adev),
					       "link",
					       i);
		if (IS_ERR(ldev))
			goto err;

		link = &ldev->link_res;
		link->cdns = auxiliary_get_drvdata(&ldev->auxdev);

		if (!link->cdns) {
			dev_err(&adev->dev, "failed to get link->cdns\n");
			/*
			 * 1 will be subtracted from i in the err label, but we need to call
			 * intel_link_dev_unregister for this ldev, so plus 1 now
			 */
			i++;
			goto err;
		}
		list_add_tail(&link->list, &ctx->link_list);
		bus = &link->cdns->bus;
		/* Calculate number of slaves */
		list_for_each(node, &bus->slaves)
			num_slaves++;
	}

	ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
	if (!ctx->ids)
		goto err;

	ctx->num_slaves = num_slaves;
	i = 0;
	list_for_each_entry(link, &ctx->link_list, list) {
		bus = &link->cdns->bus;
		list_for_each_entry(slave, &bus->slaves, node) {
			ctx->ids[i].id = slave->id;
			ctx->ids[i].link_id = bus->link_id;
			i++;
		}
	}

	return ctx;

err:
	while (i--) {
		if (!(link_mask & BIT(i)))
			continue;
		ldev = ctx->ldev[i];
		intel_link_dev_unregister(ldev);
	}
	kfree(ctx->ldev);
	kfree(ctx);
	return NULL;
}

static int
sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
{
	struct acpi_device *adev = acpi_fetch_acpi_dev(ctx->handle);
	struct sdw_intel_link_dev *ldev;
	u32 link_mask;
	int i;

	if (!adev)
		return -EINVAL;

	if (!ctx->ldev)
		return -EINVAL;

	link_mask = ctx->link_mask;

	/* Startup SDW Master devices */
	for (i = 0; i < ctx->count; i++) {
		if (!(link_mask & BIT(i)))
			continue;

		ldev = ctx->ldev[i];

		intel_link_startup(&ldev->auxdev);

		if (!ldev->link_res.clock_stop_quirks) {
			/*
			 * we need to prevent the parent PCI device
			 * from entering pm_runtime suspend, so that
			 * power rails to the SoundWire IP are not
			 * turned off.
			 */
			pm_runtime_get_noresume(ldev->link_res.dev);
		}
	}

	return 0;
}

/**
 * sdw_intel_probe() - SoundWire Intel probe routine
 * @res: resource data
 *
 * This registers an auxiliary device for each Master handled by the controller,
 * and SoundWire Master and Slave devices will be created by the auxiliary
 * device probe. All the information necessary is stored in the context, and
 * the res argument pointer can be freed after this step.
 * This function will be called after sdw_intel_acpi_scan() by SOF probe.
 */
struct sdw_intel_ctx
*sdw_intel_probe(struct sdw_intel_res *res)
{
	return sdw_intel_probe_controller(res);
}
EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT);

/**
 * sdw_intel_startup() - SoundWire Intel startup
 * @ctx: SoundWire context allocated in the probe
 *
 * Startup Intel SoundWire controller. This function will be called after
 * Intel Audio DSP is powered up.
 */
int sdw_intel_startup(struct sdw_intel_ctx *ctx)
{
	return sdw_intel_startup_controller(ctx);
}
EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT);
/**
 * sdw_intel_exit() - SoundWire Intel exit
 * @ctx: SoundWire context allocated in the probe
 *
 * Delete the controller instances created and cleanup
 */
void sdw_intel_exit(struct sdw_intel_ctx *ctx)
{
	struct sdw_intel_link_res *link;

	/* we first resume links and devices and wait synchronously before the cleanup */
	list_for_each_entry(link, &ctx->link_list, list) {
		struct sdw_bus *bus = &link->cdns->bus;
		int ret;

		ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
		if (ret < 0)
			dev_err(bus->dev, "%s: intel_resume_child_device failed: %d\n",
				__func__, ret);
	}

	sdw_intel_cleanup(ctx);
	kfree(ctx->ids);
	kfree(ctx->ldev);
	kfree(ctx);
}
EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT);

void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
{
	struct sdw_intel_link_dev *ldev;
	u32 link_mask;
	int i;

	if (!ctx->ldev)
		return;

	link_mask = ctx->link_mask;

	/* Startup SDW Master devices */
	for (i = 0; i < ctx->count; i++) {
		if (!(link_mask & BIT(i)))
			continue;

		ldev = ctx->ldev[i];

		intel_link_process_wakeen_event(&ldev->auxdev);
	}
}
EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Intel Soundwire Init Library");