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3648e78e SD |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2011-2017, The Linux Foundation | |
4 | */ | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/errno.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/init.h> | |
46a2bb5a | 10 | #include <linux/idr.h> |
7588a511 | 11 | #include <linux/of.h> |
9e663f48 | 12 | #include <linux/of_device.h> |
4b14e62a | 13 | #include <linux/pm_runtime.h> |
3648e78e | 14 | #include <linux/slimbus.h> |
46a2bb5a SD |
15 | #include "slimbus.h" |
16 | ||
17 | static DEFINE_IDA(ctrl_ida); | |
3648e78e SD |
18 | |
19 | static const struct slim_device_id *slim_match(const struct slim_device_id *id, | |
20 | const struct slim_device *sbdev) | |
21 | { | |
22 | while (id->manf_id != 0 || id->prod_code != 0) { | |
23 | if (id->manf_id == sbdev->e_addr.manf_id && | |
8631f940 SK |
24 | id->prod_code == sbdev->e_addr.prod_code && |
25 | id->dev_index == sbdev->e_addr.dev_index && | |
26 | id->instance == sbdev->e_addr.instance) | |
3648e78e SD |
27 | return id; |
28 | id++; | |
29 | } | |
30 | return NULL; | |
31 | } | |
32 | ||
33 | static int slim_device_match(struct device *dev, struct device_driver *drv) | |
34 | { | |
35 | struct slim_device *sbdev = to_slim_device(dev); | |
36 | struct slim_driver *sbdrv = to_slim_driver(drv); | |
37 | ||
14a649d3 SK |
38 | /* Attempt an OF style match first */ |
39 | if (of_driver_match_device(dev, drv)) | |
40 | return 1; | |
41 | ||
3648e78e SD |
42 | return !!slim_match(sbdrv->id_table, sbdev); |
43 | } | |
44 | ||
380c6246 SK |
45 | static void slim_device_update_status(struct slim_device *sbdev, |
46 | enum slim_device_status status) | |
47 | { | |
48 | struct slim_driver *sbdrv; | |
49 | ||
50 | if (sbdev->status == status) | |
51 | return; | |
52 | ||
53 | sbdev->status = status; | |
54 | if (!sbdev->dev.driver) | |
55 | return; | |
56 | ||
57 | sbdrv = to_slim_driver(sbdev->dev.driver); | |
58 | if (sbdrv->device_status) | |
59 | sbdrv->device_status(sbdev, sbdev->status); | |
60 | } | |
61 | ||
3648e78e SD |
62 | static int slim_device_probe(struct device *dev) |
63 | { | |
64 | struct slim_device *sbdev = to_slim_device(dev); | |
65 | struct slim_driver *sbdrv = to_slim_driver(dev->driver); | |
8f3d5fcd | 66 | int ret; |
3648e78e | 67 | |
8f3d5fcd SK |
68 | ret = sbdrv->probe(sbdev); |
69 | if (ret) | |
70 | return ret; | |
71 | ||
72 | /* try getting the logical address after probe */ | |
73 | ret = slim_get_logical_addr(sbdev); | |
74 | if (!ret) { | |
380c6246 | 75 | slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP); |
8f3d5fcd SK |
76 | } else { |
77 | dev_err(&sbdev->dev, "Failed to get logical address\n"); | |
78 | ret = -EPROBE_DEFER; | |
79 | } | |
80 | ||
81 | return ret; | |
3648e78e SD |
82 | } |
83 | ||
84 | static int slim_device_remove(struct device *dev) | |
85 | { | |
86 | struct slim_device *sbdev = to_slim_device(dev); | |
87 | struct slim_driver *sbdrv; | |
88 | ||
89 | if (dev->driver) { | |
90 | sbdrv = to_slim_driver(dev->driver); | |
91 | if (sbdrv->remove) | |
92 | sbdrv->remove(sbdev); | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
9e663f48 SK |
98 | static int slim_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
99 | { | |
100 | struct slim_device *sbdev = to_slim_device(dev); | |
9e663f48 SK |
101 | |
102 | return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev)); | |
103 | } | |
104 | ||
3648e78e SD |
105 | struct bus_type slimbus_bus = { |
106 | .name = "slimbus", | |
107 | .match = slim_device_match, | |
108 | .probe = slim_device_probe, | |
109 | .remove = slim_device_remove, | |
9e663f48 | 110 | .uevent = slim_device_uevent, |
3648e78e SD |
111 | }; |
112 | EXPORT_SYMBOL_GPL(slimbus_bus); | |
113 | ||
114 | /* | |
115 | * __slim_driver_register() - Client driver registration with SLIMbus | |
116 | * | |
117 | * @drv:Client driver to be associated with client-device. | |
118 | * @owner: owning module/driver | |
119 | * | |
120 | * This API will register the client driver with the SLIMbus | |
121 | * It is called from the driver's module-init function. | |
122 | */ | |
123 | int __slim_driver_register(struct slim_driver *drv, struct module *owner) | |
124 | { | |
125 | /* ID table and probe are mandatory */ | |
14a649d3 | 126 | if (!(drv->driver.of_match_table || drv->id_table) || !drv->probe) |
3648e78e SD |
127 | return -EINVAL; |
128 | ||
129 | drv->driver.bus = &slimbus_bus; | |
130 | drv->driver.owner = owner; | |
131 | ||
132 | return driver_register(&drv->driver); | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(__slim_driver_register); | |
135 | ||
136 | /* | |
137 | * slim_driver_unregister() - Undo effect of slim_driver_register | |
138 | * | |
139 | * @drv: Client driver to be unregistered | |
140 | */ | |
141 | void slim_driver_unregister(struct slim_driver *drv) | |
142 | { | |
143 | driver_unregister(&drv->driver); | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(slim_driver_unregister); | |
146 | ||
46a2bb5a SD |
147 | static void slim_dev_release(struct device *dev) |
148 | { | |
149 | struct slim_device *sbdev = to_slim_device(dev); | |
150 | ||
151 | kfree(sbdev); | |
152 | } | |
153 | ||
154 | static int slim_add_device(struct slim_controller *ctrl, | |
155 | struct slim_device *sbdev, | |
156 | struct device_node *node) | |
157 | { | |
158 | sbdev->dev.bus = &slimbus_bus; | |
159 | sbdev->dev.parent = ctrl->dev; | |
160 | sbdev->dev.release = slim_dev_release; | |
161 | sbdev->dev.driver = NULL; | |
162 | sbdev->ctrl = ctrl; | |
abb9c9b8 SK |
163 | INIT_LIST_HEAD(&sbdev->stream_list); |
164 | spin_lock_init(&sbdev->stream_list_lock); | |
dbf4d133 SK |
165 | sbdev->dev.of_node = of_node_get(node); |
166 | sbdev->dev.fwnode = of_fwnode_handle(node); | |
7588a511 | 167 | |
46a2bb5a SD |
168 | dev_set_name(&sbdev->dev, "%x:%x:%x:%x", |
169 | sbdev->e_addr.manf_id, | |
170 | sbdev->e_addr.prod_code, | |
171 | sbdev->e_addr.dev_index, | |
172 | sbdev->e_addr.instance); | |
173 | ||
174 | return device_register(&sbdev->dev); | |
175 | } | |
176 | ||
177 | static struct slim_device *slim_alloc_device(struct slim_controller *ctrl, | |
178 | struct slim_eaddr *eaddr, | |
179 | struct device_node *node) | |
180 | { | |
181 | struct slim_device *sbdev; | |
182 | int ret; | |
183 | ||
184 | sbdev = kzalloc(sizeof(*sbdev), GFP_KERNEL); | |
185 | if (!sbdev) | |
186 | return NULL; | |
187 | ||
188 | sbdev->e_addr = *eaddr; | |
189 | ret = slim_add_device(ctrl, sbdev, node); | |
190 | if (ret) { | |
bd329f02 | 191 | put_device(&sbdev->dev); |
46a2bb5a SD |
192 | return NULL; |
193 | } | |
194 | ||
195 | return sbdev; | |
196 | } | |
197 | ||
7588a511 SK |
198 | static void of_register_slim_devices(struct slim_controller *ctrl) |
199 | { | |
200 | struct device *dev = ctrl->dev; | |
201 | struct device_node *node; | |
202 | ||
203 | if (!ctrl->dev->of_node) | |
204 | return; | |
205 | ||
206 | for_each_child_of_node(ctrl->dev->of_node, node) { | |
207 | struct slim_device *sbdev; | |
208 | struct slim_eaddr e_addr; | |
209 | const char *compat = NULL; | |
210 | int reg[2], ret; | |
211 | int manf_id, prod_code; | |
212 | ||
213 | compat = of_get_property(node, "compatible", NULL); | |
214 | if (!compat) | |
215 | continue; | |
216 | ||
217 | ret = sscanf(compat, "slim%x,%x", &manf_id, &prod_code); | |
218 | if (ret != 2) { | |
219 | dev_err(dev, "Manf ID & Product code not found %s\n", | |
220 | compat); | |
221 | continue; | |
222 | } | |
223 | ||
224 | ret = of_property_read_u32_array(node, "reg", reg, 2); | |
225 | if (ret) { | |
226 | dev_err(dev, "Device and Instance id not found:%d\n", | |
227 | ret); | |
228 | continue; | |
229 | } | |
230 | ||
231 | e_addr.dev_index = reg[0]; | |
232 | e_addr.instance = reg[1]; | |
233 | e_addr.manf_id = manf_id; | |
234 | e_addr.prod_code = prod_code; | |
235 | ||
236 | sbdev = slim_alloc_device(ctrl, &e_addr, node); | |
237 | if (!sbdev) | |
238 | continue; | |
239 | } | |
240 | } | |
241 | ||
46a2bb5a SD |
242 | /* |
243 | * slim_register_controller() - Controller bring-up and registration. | |
244 | * | |
245 | * @ctrl: Controller to be registered. | |
246 | * | |
247 | * A controller is registered with the framework using this API. | |
248 | * If devices on a controller were registered before controller, | |
249 | * this will make sure that they get probed when controller is up | |
250 | */ | |
251 | int slim_register_controller(struct slim_controller *ctrl) | |
252 | { | |
253 | int id; | |
254 | ||
255 | id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL); | |
256 | if (id < 0) | |
257 | return id; | |
258 | ||
259 | ctrl->id = id; | |
260 | ||
261 | if (!ctrl->min_cg) | |
262 | ctrl->min_cg = SLIM_MIN_CLK_GEAR; | |
263 | if (!ctrl->max_cg) | |
264 | ctrl->max_cg = SLIM_MAX_CLK_GEAR; | |
265 | ||
266 | ida_init(&ctrl->laddr_ida); | |
267 | idr_init(&ctrl->tid_idr); | |
268 | mutex_init(&ctrl->lock); | |
4b14e62a SD |
269 | mutex_init(&ctrl->sched.m_reconf); |
270 | init_completion(&ctrl->sched.pause_comp); | |
8147760d | 271 | spin_lock_init(&ctrl->txn_lock); |
46a2bb5a SD |
272 | |
273 | dev_dbg(ctrl->dev, "Bus [%s] registered:dev:%p\n", | |
274 | ctrl->name, ctrl->dev); | |
275 | ||
7588a511 SK |
276 | of_register_slim_devices(ctrl); |
277 | ||
46a2bb5a SD |
278 | return 0; |
279 | } | |
280 | EXPORT_SYMBOL_GPL(slim_register_controller); | |
281 | ||
282 | /* slim_remove_device: Remove the effect of slim_add_device() */ | |
283 | static void slim_remove_device(struct slim_device *sbdev) | |
284 | { | |
01360857 | 285 | of_node_put(sbdev->dev.of_node); |
46a2bb5a SD |
286 | device_unregister(&sbdev->dev); |
287 | } | |
288 | ||
289 | static int slim_ctrl_remove_device(struct device *dev, void *null) | |
290 | { | |
291 | slim_remove_device(to_slim_device(dev)); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /** | |
296 | * slim_unregister_controller() - Controller tear-down. | |
297 | * | |
298 | * @ctrl: Controller to tear-down. | |
299 | */ | |
300 | int slim_unregister_controller(struct slim_controller *ctrl) | |
301 | { | |
302 | /* Remove all clients */ | |
303 | device_for_each_child(ctrl->dev, NULL, slim_ctrl_remove_device); | |
4b14e62a SD |
304 | /* Enter Clock Pause */ |
305 | slim_ctrl_clk_pause(ctrl, false, 0); | |
46a2bb5a SD |
306 | ida_simple_remove(&ctrl_ida, ctrl->id); |
307 | ||
308 | return 0; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(slim_unregister_controller); | |
311 | ||
46a2bb5a SD |
312 | /** |
313 | * slim_report_absent() - Controller calls this function when a device | |
314 | * reports absent, OR when the device cannot be communicated with | |
315 | * | |
316 | * @sbdev: Device that cannot be reached, or sent report absent | |
317 | */ | |
318 | void slim_report_absent(struct slim_device *sbdev) | |
319 | { | |
320 | struct slim_controller *ctrl = sbdev->ctrl; | |
321 | ||
322 | if (!ctrl) | |
323 | return; | |
324 | ||
325 | /* invalidate logical addresses */ | |
326 | mutex_lock(&ctrl->lock); | |
327 | sbdev->is_laddr_valid = false; | |
328 | mutex_unlock(&ctrl->lock); | |
329 | ||
330 | ida_simple_remove(&ctrl->laddr_ida, sbdev->laddr); | |
331 | slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_DOWN); | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(slim_report_absent); | |
334 | ||
335 | static bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b) | |
336 | { | |
337 | return (a->manf_id == b->manf_id && | |
338 | a->prod_code == b->prod_code && | |
339 | a->dev_index == b->dev_index && | |
340 | a->instance == b->instance); | |
341 | } | |
342 | ||
343 | static int slim_match_dev(struct device *dev, void *data) | |
344 | { | |
345 | struct slim_eaddr *e_addr = data; | |
346 | struct slim_device *sbdev = to_slim_device(dev); | |
347 | ||
348 | return slim_eaddr_equal(&sbdev->e_addr, e_addr); | |
349 | } | |
350 | ||
351 | static struct slim_device *find_slim_device(struct slim_controller *ctrl, | |
352 | struct slim_eaddr *eaddr) | |
353 | { | |
354 | struct slim_device *sbdev; | |
355 | struct device *dev; | |
356 | ||
357 | dev = device_find_child(ctrl->dev, eaddr, slim_match_dev); | |
358 | if (dev) { | |
359 | sbdev = to_slim_device(dev); | |
360 | return sbdev; | |
361 | } | |
362 | ||
363 | return NULL; | |
364 | } | |
365 | ||
366 | /** | |
367 | * slim_get_device() - get handle to a device. | |
368 | * | |
369 | * @ctrl: Controller on which this device will be added/queried | |
370 | * @e_addr: Enumeration address of the device to be queried | |
371 | * | |
372 | * Return: pointer to a device if it has already reported. Creates a new | |
373 | * device and returns pointer to it if the device has not yet enumerated. | |
374 | */ | |
375 | struct slim_device *slim_get_device(struct slim_controller *ctrl, | |
376 | struct slim_eaddr *e_addr) | |
377 | { | |
378 | struct slim_device *sbdev; | |
379 | ||
380 | sbdev = find_slim_device(ctrl, e_addr); | |
381 | if (!sbdev) { | |
382 | sbdev = slim_alloc_device(ctrl, e_addr, NULL); | |
383 | if (!sbdev) | |
384 | return ERR_PTR(-ENOMEM); | |
385 | } | |
386 | ||
387 | return sbdev; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(slim_get_device); | |
390 | ||
e0772de8 SK |
391 | static int of_slim_match_dev(struct device *dev, void *data) |
392 | { | |
393 | struct device_node *np = data; | |
394 | struct slim_device *sbdev = to_slim_device(dev); | |
395 | ||
396 | return (sbdev->dev.of_node == np); | |
397 | } | |
398 | ||
399 | static struct slim_device *of_find_slim_device(struct slim_controller *ctrl, | |
400 | struct device_node *np) | |
401 | { | |
402 | struct slim_device *sbdev; | |
403 | struct device *dev; | |
404 | ||
405 | dev = device_find_child(ctrl->dev, np, of_slim_match_dev); | |
406 | if (dev) { | |
407 | sbdev = to_slim_device(dev); | |
408 | return sbdev; | |
409 | } | |
410 | ||
411 | return NULL; | |
412 | } | |
413 | ||
414 | /** | |
415 | * of_slim_get_device() - get handle to a device using dt node. | |
416 | * | |
417 | * @ctrl: Controller on which this device will be added/queried | |
418 | * @np: node pointer to device | |
419 | * | |
420 | * Return: pointer to a device if it has already reported. Creates a new | |
421 | * device and returns pointer to it if the device has not yet enumerated. | |
422 | */ | |
423 | struct slim_device *of_slim_get_device(struct slim_controller *ctrl, | |
424 | struct device_node *np) | |
425 | { | |
426 | return of_find_slim_device(ctrl, np); | |
427 | } | |
428 | EXPORT_SYMBOL_GPL(of_slim_get_device); | |
429 | ||
46a2bb5a SD |
430 | static int slim_device_alloc_laddr(struct slim_device *sbdev, |
431 | bool report_present) | |
432 | { | |
433 | struct slim_controller *ctrl = sbdev->ctrl; | |
434 | u8 laddr; | |
435 | int ret; | |
436 | ||
437 | mutex_lock(&ctrl->lock); | |
438 | if (ctrl->get_laddr) { | |
439 | ret = ctrl->get_laddr(ctrl, &sbdev->e_addr, &laddr); | |
440 | if (ret < 0) | |
441 | goto err; | |
442 | } else if (report_present) { | |
443 | ret = ida_simple_get(&ctrl->laddr_ida, | |
444 | 0, SLIM_LA_MANAGER - 1, GFP_KERNEL); | |
445 | if (ret < 0) | |
446 | goto err; | |
447 | ||
448 | laddr = ret; | |
449 | } else { | |
450 | ret = -EINVAL; | |
451 | goto err; | |
452 | } | |
453 | ||
454 | if (ctrl->set_laddr) { | |
455 | ret = ctrl->set_laddr(ctrl, &sbdev->e_addr, laddr); | |
456 | if (ret) { | |
457 | ret = -EINVAL; | |
458 | goto err; | |
459 | } | |
460 | } | |
461 | ||
462 | sbdev->laddr = laddr; | |
463 | sbdev->is_laddr_valid = true; | |
cfb32101 | 464 | mutex_unlock(&ctrl->lock); |
46a2bb5a SD |
465 | |
466 | slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP); | |
467 | ||
468 | dev_dbg(ctrl->dev, "setting slimbus l-addr:%x, ea:%x,%x,%x,%x\n", | |
469 | laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code, | |
470 | sbdev->e_addr.dev_index, sbdev->e_addr.instance); | |
471 | ||
cfb32101 SK |
472 | return 0; |
473 | ||
46a2bb5a SD |
474 | err: |
475 | mutex_unlock(&ctrl->lock); | |
476 | return ret; | |
477 | ||
478 | } | |
479 | ||
480 | /** | |
481 | * slim_device_report_present() - Report enumerated device. | |
482 | * | |
483 | * @ctrl: Controller with which device is enumerated. | |
484 | * @e_addr: Enumeration address of the device. | |
485 | * @laddr: Return logical address (if valid flag is false) | |
486 | * | |
487 | * Called by controller in response to REPORT_PRESENT. Framework will assign | |
488 | * a logical address to this enumeration address. | |
489 | * Function returns -EXFULL to indicate that all logical addresses are already | |
490 | * taken. | |
491 | */ | |
492 | int slim_device_report_present(struct slim_controller *ctrl, | |
493 | struct slim_eaddr *e_addr, u8 *laddr) | |
494 | { | |
495 | struct slim_device *sbdev; | |
496 | int ret; | |
497 | ||
4b14e62a SD |
498 | ret = pm_runtime_get_sync(ctrl->dev); |
499 | ||
500 | if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) { | |
501 | dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n", | |
502 | ctrl->sched.clk_state, ret); | |
503 | goto slimbus_not_active; | |
504 | } | |
505 | ||
46a2bb5a SD |
506 | sbdev = slim_get_device(ctrl, e_addr); |
507 | if (IS_ERR(sbdev)) | |
508 | return -ENODEV; | |
509 | ||
510 | if (sbdev->is_laddr_valid) { | |
511 | *laddr = sbdev->laddr; | |
512 | return 0; | |
513 | } | |
514 | ||
515 | ret = slim_device_alloc_laddr(sbdev, true); | |
516 | ||
4b14e62a SD |
517 | slimbus_not_active: |
518 | pm_runtime_mark_last_busy(ctrl->dev); | |
519 | pm_runtime_put_autosuspend(ctrl->dev); | |
46a2bb5a SD |
520 | return ret; |
521 | } | |
522 | EXPORT_SYMBOL_GPL(slim_device_report_present); | |
523 | ||
524 | /** | |
525 | * slim_get_logical_addr() - get/allocate logical address of a SLIMbus device. | |
526 | * | |
527 | * @sbdev: client handle requesting the address. | |
528 | * | |
529 | * Return: zero if a logical address is valid or a new logical address | |
530 | * has been assigned. error code in case of error. | |
531 | */ | |
532 | int slim_get_logical_addr(struct slim_device *sbdev) | |
533 | { | |
534 | if (!sbdev->is_laddr_valid) | |
535 | return slim_device_alloc_laddr(sbdev, false); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | EXPORT_SYMBOL_GPL(slim_get_logical_addr); | |
540 | ||
3648e78e SD |
541 | static void __exit slimbus_exit(void) |
542 | { | |
543 | bus_unregister(&slimbus_bus); | |
544 | } | |
545 | module_exit(slimbus_exit); | |
546 | ||
547 | static int __init slimbus_init(void) | |
548 | { | |
549 | return bus_register(&slimbus_bus); | |
550 | } | |
551 | postcore_initcall(slimbus_init); | |
552 | ||
553 | MODULE_LICENSE("GPL v2"); | |
554 | MODULE_DESCRIPTION("SLIMbus core"); |