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d62a7d41 VK |
1 | // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
2 | // Copyright(c) 2015-17 Intel Corporation. | |
3 | ||
4 | /* | |
5 | * SDW Intel Init Routines | |
6 | * | |
7 | * Initializes and creates SDW devices based on ACPI and Hardware values | |
8 | */ | |
9 | ||
10 | #include <linux/acpi.h> | |
4abbd783 | 11 | #include <linux/export.h> |
4a98a6b2 | 12 | #include <linux/interrupt.h> |
3fc40449 | 13 | #include <linux/io.h> |
4abbd783 | 14 | #include <linux/module.h> |
29a269c6 | 15 | #include <linux/auxiliary_bus.h> |
ebf878ed | 16 | #include <linux/pm_runtime.h> |
d62a7d41 | 17 | #include <linux/soundwire/sdw_intel.h> |
b6109dd6 | 18 | #include "cadence_master.h" |
d62a7d41 | 19 | #include "intel.h" |
7cbf00bd | 20 | #include "intel_auxdevice.h" |
d62a7d41 | 21 | |
29a269c6 PLB |
22 | static void intel_link_dev_release(struct device *dev) |
23 | { | |
24 | struct auxiliary_device *auxdev = to_auxiliary_dev(dev); | |
25 | struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev); | |
26 | ||
27 | kfree(ldev); | |
28 | } | |
29 | ||
30 | /* alloc, init and add link devices */ | |
31 | static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res, | |
32 | struct sdw_intel_ctx *ctx, | |
33 | struct fwnode_handle *fwnode, | |
34 | const char *name, | |
35 | int link_id) | |
36 | { | |
37 | struct sdw_intel_link_dev *ldev; | |
38 | struct sdw_intel_link_res *link; | |
39 | struct auxiliary_device *auxdev; | |
40 | int ret; | |
41 | ||
42 | ldev = kzalloc(sizeof(*ldev), GFP_KERNEL); | |
43 | if (!ldev) | |
44 | return ERR_PTR(-ENOMEM); | |
45 | ||
46 | auxdev = &ldev->auxdev; | |
47 | auxdev->name = name; | |
48 | auxdev->dev.parent = res->parent; | |
49 | auxdev->dev.fwnode = fwnode; | |
50 | auxdev->dev.release = intel_link_dev_release; | |
51 | ||
52 | /* we don't use an IDA since we already have a link ID */ | |
53 | auxdev->id = link_id; | |
54 | ||
55 | /* | |
56 | * keep a handle on the allocated memory, to be used in all other functions. | |
57 | * Since the same pattern is used to skip links that are not enabled, there is | |
58 | * no need to check if ctx->ldev[i] is NULL later on. | |
59 | */ | |
60 | ctx->ldev[link_id] = ldev; | |
61 | ||
62 | /* Add link information used in the driver probe */ | |
63 | link = &ldev->link_res; | |
b3ad31f3 | 64 | link->hw_ops = res->hw_ops; |
29a269c6 PLB |
65 | link->mmio_base = res->mmio_base; |
66 | link->registers = res->mmio_base + SDW_LINK_BASE | |
67 | + (SDW_LINK_SIZE * link_id); | |
60e9feb7 BL |
68 | link->shim = res->mmio_base + res->shim_base; |
69 | link->alh = res->mmio_base + res->alh_base; | |
29a269c6 PLB |
70 | |
71 | link->ops = res->ops; | |
72 | link->dev = res->dev; | |
73 | ||
74 | link->clock_stop_quirks = res->clock_stop_quirks; | |
75 | link->shim_lock = &ctx->shim_lock; | |
76 | link->shim_mask = &ctx->shim_mask; | |
77 | link->link_mask = ctx->link_mask; | |
78 | ||
79 | /* now follow the two-step init/add sequence */ | |
80 | ret = auxiliary_device_init(auxdev); | |
81 | if (ret < 0) { | |
82 | dev_err(res->parent, "failed to initialize link dev %s link_id %d\n", | |
83 | name, link_id); | |
84 | kfree(ldev); | |
85 | return ERR_PTR(ret); | |
86 | } | |
87 | ||
88 | ret = auxiliary_device_add(&ldev->auxdev); | |
89 | if (ret < 0) { | |
90 | dev_err(res->parent, "failed to add link dev %s link_id %d\n", | |
91 | ldev->auxdev.name, link_id); | |
92 | /* ldev will be freed with the put_device() and .release sequence */ | |
93 | auxiliary_device_uninit(&ldev->auxdev); | |
94 | return ERR_PTR(ret); | |
95 | } | |
96 | ||
97 | return ldev; | |
98 | } | |
99 | ||
100 | static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev) | |
101 | { | |
102 | auxiliary_device_delete(&ldev->auxdev); | |
103 | auxiliary_device_uninit(&ldev->auxdev); | |
104 | } | |
105 | ||
6d2c6669 | 106 | static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx) |
d62a7d41 | 107 | { |
29a269c6 | 108 | struct sdw_intel_link_dev *ldev; |
6d2c6669 | 109 | u32 link_mask; |
d62a7d41 VK |
110 | int i; |
111 | ||
6d2c6669 PLB |
112 | link_mask = ctx->link_mask; |
113 | ||
29a269c6 | 114 | for (i = 0; i < ctx->count; i++) { |
6d2c6669 PLB |
115 | if (!(link_mask & BIT(i))) |
116 | continue; | |
117 | ||
29a269c6 | 118 | ldev = ctx->ldev[i]; |
ab996b29 | 119 | |
29a269c6 PLB |
120 | pm_runtime_disable(&ldev->auxdev.dev); |
121 | if (!ldev->link_res.clock_stop_quirks) | |
122 | pm_runtime_put_noidle(ldev->link_res.dev); | |
123 | ||
124 | intel_link_dev_unregister(ldev); | |
d62a7d41 VK |
125 | } |
126 | ||
d62a7d41 VK |
127 | return 0; |
128 | } | |
129 | ||
4a98a6b2 BL |
130 | irqreturn_t sdw_intel_thread(int irq, void *dev_id) |
131 | { | |
132 | struct sdw_intel_ctx *ctx = dev_id; | |
133 | struct sdw_intel_link_res *link; | |
134 | ||
135 | list_for_each_entry(link, &ctx->link_list, list) | |
136 | sdw_cdns_irq(irq, link->cdns); | |
137 | ||
4a98a6b2 BL |
138 | return IRQ_HANDLED; |
139 | } | |
140 | EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT); | |
141 | ||
6d2c6669 PLB |
142 | static struct sdw_intel_ctx |
143 | *sdw_intel_probe_controller(struct sdw_intel_res *res) | |
144 | { | |
6d2c6669 | 145 | struct sdw_intel_link_res *link; |
29a269c6 | 146 | struct sdw_intel_link_dev *ldev; |
6d2c6669 PLB |
147 | struct sdw_intel_ctx *ctx; |
148 | struct acpi_device *adev; | |
a8184403 BL |
149 | struct sdw_slave *slave; |
150 | struct list_head *node; | |
151 | struct sdw_bus *bus; | |
6d2c6669 | 152 | u32 link_mask; |
a8184403 | 153 | int num_slaves = 0; |
6d2c6669 PLB |
154 | int count; |
155 | int i; | |
156 | ||
157 | if (!res) | |
158 | return NULL; | |
159 | ||
8733729e RW |
160 | adev = acpi_fetch_acpi_dev(res->handle); |
161 | if (!adev) | |
6d2c6669 PLB |
162 | return NULL; |
163 | ||
164 | if (!res->count) | |
165 | return NULL; | |
166 | ||
167 | count = res->count; | |
d62a7d41 VK |
168 | dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count); |
169 | ||
29a269c6 PLB |
170 | /* |
171 | * we need to alloc/free memory manually and can't use devm: | |
172 | * this routine may be called from a workqueue, and not from | |
173 | * the parent .probe. | |
174 | * If devm_ was used, the memory might never be freed on errors. | |
175 | */ | |
176 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
d62a7d41 VK |
177 | if (!ctx) |
178 | return NULL; | |
179 | ||
180 | ctx->count = count; | |
29a269c6 PLB |
181 | |
182 | /* | |
183 | * allocate the array of pointers. The link-specific data is allocated | |
184 | * as part of the first loop below and released with the auxiliary_device_uninit(). | |
185 | * If some links are disabled, the link pointer will remain NULL. Given that the | |
186 | * number of links is small, this is simpler than using a list to keep track of links. | |
187 | */ | |
188 | ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL); | |
189 | if (!ctx->ldev) { | |
190 | kfree(ctx); | |
dd906cc6 | 191 | return NULL; |
29a269c6 | 192 | } |
d62a7d41 | 193 | |
6d2c6669 | 194 | ctx->mmio_base = res->mmio_base; |
60e9feb7 BL |
195 | ctx->shim_base = res->shim_base; |
196 | ctx->alh_base = res->alh_base; | |
6d2c6669 PLB |
197 | ctx->link_mask = res->link_mask; |
198 | ctx->handle = res->handle; | |
4a17c441 | 199 | mutex_init(&ctx->shim_lock); |
6d2c6669 | 200 | |
6d2c6669 | 201 | link_mask = ctx->link_mask; |
d62a7d41 | 202 | |
4a98a6b2 BL |
203 | INIT_LIST_HEAD(&ctx->link_list); |
204 | ||
29a269c6 PLB |
205 | for (i = 0; i < count; i++) { |
206 | if (!(link_mask & BIT(i))) | |
50302fc7 | 207 | continue; |
50302fc7 | 208 | |
29a269c6 PLB |
209 | /* |
210 | * init and add a device for each link | |
211 | * | |
212 | * The name of the device will be soundwire_intel.link.[i], | |
213 | * with the "soundwire_intel" module prefix automatically added | |
214 | * by the auxiliary bus core. | |
215 | */ | |
216 | ldev = intel_link_dev_register(res, | |
217 | ctx, | |
218 | acpi_fwnode_handle(adev), | |
219 | "link", | |
220 | i); | |
221 | if (IS_ERR(ldev)) | |
6d2c6669 | 222 | goto err; |
29a269c6 PLB |
223 | |
224 | link = &ldev->link_res; | |
3edac08e | 225 | link->cdns = auxiliary_get_drvdata(&ldev->auxdev); |
4a98a6b2 | 226 | |
14968dd3 BL |
227 | if (!link->cdns) { |
228 | dev_err(&adev->dev, "failed to get link->cdns\n"); | |
229 | /* | |
230 | * 1 will be subtracted from i in the err label, but we need to call | |
231 | * intel_link_dev_unregister for this ldev, so plus 1 now | |
232 | */ | |
233 | i++; | |
234 | goto err; | |
235 | } | |
4a98a6b2 | 236 | list_add_tail(&link->list, &ctx->link_list); |
a8184403 BL |
237 | bus = &link->cdns->bus; |
238 | /* Calculate number of slaves */ | |
239 | list_for_each(node, &bus->slaves) | |
240 | num_slaves++; | |
241 | } | |
242 | ||
29a269c6 | 243 | ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL); |
a8184403 BL |
244 | if (!ctx->ids) |
245 | goto err; | |
246 | ||
247 | ctx->num_slaves = num_slaves; | |
248 | i = 0; | |
249 | list_for_each_entry(link, &ctx->link_list, list) { | |
250 | bus = &link->cdns->bus; | |
251 | list_for_each_entry(slave, &bus->slaves, node) { | |
252 | ctx->ids[i].id = slave->id; | |
253 | ctx->ids[i].link_id = bus->link_id; | |
254 | i++; | |
255 | } | |
d62a7d41 VK |
256 | } |
257 | ||
258 | return ctx; | |
259 | ||
6d2c6669 | 260 | err: |
29a269c6 PLB |
261 | while (i--) { |
262 | if (!(link_mask & BIT(i))) | |
263 | continue; | |
264 | ldev = ctx->ldev[i]; | |
265 | intel_link_dev_unregister(ldev); | |
266 | } | |
267 | kfree(ctx->ldev); | |
268 | kfree(ctx); | |
d62a7d41 VK |
269 | return NULL; |
270 | } | |
271 | ||
6d2c6669 PLB |
272 | static int |
273 | sdw_intel_startup_controller(struct sdw_intel_ctx *ctx) | |
274 | { | |
8733729e | 275 | struct acpi_device *adev = acpi_fetch_acpi_dev(ctx->handle); |
29a269c6 | 276 | struct sdw_intel_link_dev *ldev; |
6d2c6669 PLB |
277 | u32 link_mask; |
278 | int i; | |
279 | ||
8733729e | 280 | if (!adev) |
6d2c6669 PLB |
281 | return -EINVAL; |
282 | ||
29a269c6 | 283 | if (!ctx->ldev) |
6d2c6669 PLB |
284 | return -EINVAL; |
285 | ||
6d2c6669 PLB |
286 | link_mask = ctx->link_mask; |
287 | ||
288 | /* Startup SDW Master devices */ | |
29a269c6 | 289 | for (i = 0; i < ctx->count; i++) { |
6d2c6669 PLB |
290 | if (!(link_mask & BIT(i))) |
291 | continue; | |
292 | ||
29a269c6 PLB |
293 | ldev = ctx->ldev[i]; |
294 | ||
295 | intel_link_startup(&ldev->auxdev); | |
ab996b29 | 296 | |
29a269c6 | 297 | if (!ldev->link_res.clock_stop_quirks) { |
ab996b29 PLB |
298 | /* |
299 | * we need to prevent the parent PCI device | |
300 | * from entering pm_runtime suspend, so that | |
301 | * power rails to the SoundWire IP are not | |
302 | * turned off. | |
303 | */ | |
29a269c6 | 304 | pm_runtime_get_noresume(ldev->link_res.dev); |
ab996b29 | 305 | } |
6d2c6669 PLB |
306 | } |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
6d2c6669 PLB |
311 | /** |
312 | * sdw_intel_probe() - SoundWire Intel probe routine | |
313 | * @res: resource data | |
314 | * | |
29a269c6 PLB |
315 | * This registers an auxiliary device for each Master handled by the controller, |
316 | * and SoundWire Master and Slave devices will be created by the auxiliary | |
6d2c6669 PLB |
317 | * device probe. All the information necessary is stored in the context, and |
318 | * the res argument pointer can be freed after this step. | |
319 | * This function will be called after sdw_intel_acpi_scan() by SOF probe. | |
320 | */ | |
321 | struct sdw_intel_ctx | |
322 | *sdw_intel_probe(struct sdw_intel_res *res) | |
323 | { | |
324 | return sdw_intel_probe_controller(res); | |
325 | } | |
8459cea7 | 326 | EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT); |
6d2c6669 PLB |
327 | |
328 | /** | |
329 | * sdw_intel_startup() - SoundWire Intel startup | |
330 | * @ctx: SoundWire context allocated in the probe | |
331 | * | |
332 | * Startup Intel SoundWire controller. This function will be called after | |
333 | * Intel Audio DSP is powered up. | |
334 | */ | |
335 | int sdw_intel_startup(struct sdw_intel_ctx *ctx) | |
336 | { | |
337 | return sdw_intel_startup_controller(ctx); | |
338 | } | |
8459cea7 | 339 | EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT); |
d62a7d41 VK |
340 | /** |
341 | * sdw_intel_exit() - SoundWire Intel exit | |
6d2c6669 | 342 | * @ctx: SoundWire context allocated in the probe |
d62a7d41 VK |
343 | * |
344 | * Delete the controller instances created and cleanup | |
345 | */ | |
f98f690f | 346 | void sdw_intel_exit(struct sdw_intel_ctx *ctx) |
d62a7d41 | 347 | { |
6d2c6669 | 348 | sdw_intel_cleanup(ctx); |
29a269c6 PLB |
349 | kfree(ctx->ids); |
350 | kfree(ctx->ldev); | |
351 | kfree(ctx); | |
d62a7d41 | 352 | } |
8459cea7 | 353 | EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT); |
d62a7d41 | 354 | |
ab2c9132 RW |
355 | void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx) |
356 | { | |
29a269c6 | 357 | struct sdw_intel_link_dev *ldev; |
ab2c9132 RW |
358 | u32 link_mask; |
359 | int i; | |
360 | ||
29a269c6 | 361 | if (!ctx->ldev) |
ab2c9132 RW |
362 | return; |
363 | ||
ab2c9132 RW |
364 | link_mask = ctx->link_mask; |
365 | ||
366 | /* Startup SDW Master devices */ | |
29a269c6 | 367 | for (i = 0; i < ctx->count; i++) { |
ab2c9132 RW |
368 | if (!(link_mask & BIT(i))) |
369 | continue; | |
370 | ||
29a269c6 PLB |
371 | ldev = ctx->ldev[i]; |
372 | ||
373 | intel_link_process_wakeen_event(&ldev->auxdev); | |
ab2c9132 RW |
374 | } |
375 | } | |
376 | EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT); | |
377 | ||
d62a7d41 VK |
378 | MODULE_LICENSE("Dual BSD/GPL"); |
379 | MODULE_DESCRIPTION("Intel Soundwire Init Library"); |