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3a379bbc BB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2018 Cadence Design Systems Inc. | |
4 | * | |
5 | * Author: Boris Brezillon <boris.brezillon@bootlin.com> | |
6 | */ | |
7 | ||
8 | #include <linux/atomic.h> | |
9 | #include <linux/bug.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/export.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/workqueue.h> | |
19 | ||
20 | #include "internals.h" | |
21 | ||
22 | static DEFINE_IDR(i3c_bus_idr); | |
23 | static DEFINE_MUTEX(i3c_core_lock); | |
24 | ||
25 | /** | |
26 | * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation | |
27 | * @bus: I3C bus to take the lock on | |
28 | * | |
29 | * This function takes the bus lock so that no other operations can occur on | |
30 | * the bus. This is needed for all kind of bus maintenance operation, like | |
31 | * - enabling/disabling slave events | |
32 | * - re-triggering DAA | |
33 | * - changing the dynamic address of a device | |
34 | * - relinquishing mastership | |
35 | * - ... | |
36 | * | |
37 | * The reason for this kind of locking is that we don't want drivers and core | |
38 | * logic to rely on I3C device information that could be changed behind their | |
39 | * back. | |
40 | */ | |
41 | static void i3c_bus_maintenance_lock(struct i3c_bus *bus) | |
42 | { | |
43 | down_write(&bus->lock); | |
44 | } | |
45 | ||
46 | /** | |
47 | * i3c_bus_maintenance_unlock - Release the bus lock after a maintenance | |
48 | * operation | |
49 | * @bus: I3C bus to release the lock on | |
50 | * | |
51 | * Should be called when the bus maintenance operation is done. See | |
52 | * i3c_bus_maintenance_lock() for more details on what these maintenance | |
53 | * operations are. | |
54 | */ | |
55 | static void i3c_bus_maintenance_unlock(struct i3c_bus *bus) | |
56 | { | |
57 | up_write(&bus->lock); | |
58 | } | |
59 | ||
60 | /** | |
61 | * i3c_bus_normaluse_lock - Lock the bus for a normal operation | |
62 | * @bus: I3C bus to take the lock on | |
63 | * | |
64 | * This function takes the bus lock for any operation that is not a maintenance | |
65 | * operation (see i3c_bus_maintenance_lock() for a non-exhaustive list of | |
66 | * maintenance operations). Basically all communications with I3C devices are | |
67 | * normal operations (HDR, SDR transfers or CCC commands that do not change bus | |
68 | * state or I3C dynamic address). | |
69 | * | |
70 | * Note that this lock is not guaranteeing serialization of normal operations. | |
71 | * In other words, transfer requests passed to the I3C master can be submitted | |
72 | * in parallel and I3C master drivers have to use their own locking to make | |
73 | * sure two different communications are not inter-mixed, or access to the | |
74 | * output/input queue is not done while the engine is busy. | |
75 | */ | |
76 | void i3c_bus_normaluse_lock(struct i3c_bus *bus) | |
77 | { | |
78 | down_read(&bus->lock); | |
79 | } | |
80 | ||
81 | /** | |
82 | * i3c_bus_normaluse_unlock - Release the bus lock after a normal operation | |
83 | * @bus: I3C bus to release the lock on | |
84 | * | |
85 | * Should be called when a normal operation is done. See | |
86 | * i3c_bus_normaluse_lock() for more details on what these normal operations | |
87 | * are. | |
88 | */ | |
89 | void i3c_bus_normaluse_unlock(struct i3c_bus *bus) | |
90 | { | |
91 | up_read(&bus->lock); | |
92 | } | |
93 | ||
ecc8fb54 VS |
94 | static struct i3c_master_controller * |
95 | i3c_bus_to_i3c_master(struct i3c_bus *i3cbus) | |
96 | { | |
97 | return container_of(i3cbus, struct i3c_master_controller, bus); | |
98 | } | |
99 | ||
3a379bbc BB |
100 | static struct i3c_master_controller *dev_to_i3cmaster(struct device *dev) |
101 | { | |
102 | return container_of(dev, struct i3c_master_controller, dev); | |
103 | } | |
104 | ||
105 | static const struct device_type i3c_device_type; | |
106 | ||
107 | static struct i3c_bus *dev_to_i3cbus(struct device *dev) | |
108 | { | |
109 | struct i3c_master_controller *master; | |
110 | ||
111 | if (dev->type == &i3c_device_type) | |
112 | return dev_to_i3cdev(dev)->bus; | |
113 | ||
114 | master = dev_to_i3cmaster(dev); | |
115 | ||
116 | return &master->bus; | |
117 | } | |
118 | ||
119 | static struct i3c_dev_desc *dev_to_i3cdesc(struct device *dev) | |
120 | { | |
121 | struct i3c_master_controller *master; | |
122 | ||
123 | if (dev->type == &i3c_device_type) | |
124 | return dev_to_i3cdev(dev)->desc; | |
125 | ||
6030f42d | 126 | master = dev_to_i3cmaster(dev); |
3a379bbc BB |
127 | |
128 | return master->this; | |
129 | } | |
130 | ||
131 | static ssize_t bcr_show(struct device *dev, | |
132 | struct device_attribute *da, | |
133 | char *buf) | |
134 | { | |
135 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
136 | struct i3c_dev_desc *desc; | |
137 | ssize_t ret; | |
138 | ||
139 | i3c_bus_normaluse_lock(bus); | |
140 | desc = dev_to_i3cdesc(dev); | |
141 | ret = sprintf(buf, "%x\n", desc->info.bcr); | |
142 | i3c_bus_normaluse_unlock(bus); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | static DEVICE_ATTR_RO(bcr); | |
147 | ||
148 | static ssize_t dcr_show(struct device *dev, | |
149 | struct device_attribute *da, | |
150 | char *buf) | |
151 | { | |
152 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
153 | struct i3c_dev_desc *desc; | |
154 | ssize_t ret; | |
155 | ||
156 | i3c_bus_normaluse_lock(bus); | |
157 | desc = dev_to_i3cdesc(dev); | |
158 | ret = sprintf(buf, "%x\n", desc->info.dcr); | |
159 | i3c_bus_normaluse_unlock(bus); | |
160 | ||
161 | return ret; | |
162 | } | |
163 | static DEVICE_ATTR_RO(dcr); | |
164 | ||
165 | static ssize_t pid_show(struct device *dev, | |
166 | struct device_attribute *da, | |
167 | char *buf) | |
168 | { | |
169 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
170 | struct i3c_dev_desc *desc; | |
171 | ssize_t ret; | |
172 | ||
173 | i3c_bus_normaluse_lock(bus); | |
174 | desc = dev_to_i3cdesc(dev); | |
175 | ret = sprintf(buf, "%llx\n", desc->info.pid); | |
176 | i3c_bus_normaluse_unlock(bus); | |
177 | ||
178 | return ret; | |
179 | } | |
180 | static DEVICE_ATTR_RO(pid); | |
181 | ||
182 | static ssize_t dynamic_address_show(struct device *dev, | |
183 | struct device_attribute *da, | |
184 | char *buf) | |
185 | { | |
186 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
187 | struct i3c_dev_desc *desc; | |
188 | ssize_t ret; | |
189 | ||
190 | i3c_bus_normaluse_lock(bus); | |
191 | desc = dev_to_i3cdesc(dev); | |
192 | ret = sprintf(buf, "%02x\n", desc->info.dyn_addr); | |
193 | i3c_bus_normaluse_unlock(bus); | |
194 | ||
195 | return ret; | |
196 | } | |
197 | static DEVICE_ATTR_RO(dynamic_address); | |
198 | ||
199 | static const char * const hdrcap_strings[] = { | |
200 | "hdr-ddr", "hdr-tsp", "hdr-tsl", | |
201 | }; | |
202 | ||
203 | static ssize_t hdrcap_show(struct device *dev, | |
204 | struct device_attribute *da, | |
205 | char *buf) | |
206 | { | |
207 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
208 | struct i3c_dev_desc *desc; | |
209 | ssize_t offset = 0, ret; | |
210 | unsigned long caps; | |
211 | int mode; | |
212 | ||
213 | i3c_bus_normaluse_lock(bus); | |
214 | desc = dev_to_i3cdesc(dev); | |
215 | caps = desc->info.hdr_cap; | |
216 | for_each_set_bit(mode, &caps, 8) { | |
217 | if (mode >= ARRAY_SIZE(hdrcap_strings)) | |
218 | break; | |
219 | ||
220 | if (!hdrcap_strings[mode]) | |
221 | continue; | |
222 | ||
223 | ret = sprintf(buf + offset, offset ? " %s" : "%s", | |
224 | hdrcap_strings[mode]); | |
225 | if (ret < 0) | |
226 | goto out; | |
227 | ||
228 | offset += ret; | |
229 | } | |
230 | ||
231 | ret = sprintf(buf + offset, "\n"); | |
232 | if (ret < 0) | |
233 | goto out; | |
234 | ||
235 | ret = offset + ret; | |
236 | ||
237 | out: | |
238 | i3c_bus_normaluse_unlock(bus); | |
239 | ||
240 | return ret; | |
241 | } | |
242 | static DEVICE_ATTR_RO(hdrcap); | |
243 | ||
7ec0ddb0 BB |
244 | static ssize_t modalias_show(struct device *dev, |
245 | struct device_attribute *da, char *buf) | |
246 | { | |
247 | struct i3c_device *i3c = dev_to_i3cdev(dev); | |
248 | struct i3c_device_info devinfo; | |
249 | u16 manuf, part, ext; | |
250 | ||
251 | i3c_device_get_info(i3c, &devinfo); | |
252 | manuf = I3C_PID_MANUF_ID(devinfo.pid); | |
253 | part = I3C_PID_PART_ID(devinfo.pid); | |
254 | ext = I3C_PID_EXTRA_INFO(devinfo.pid); | |
255 | ||
256 | if (I3C_PID_RND_LOWER_32BITS(devinfo.pid)) | |
257 | return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr, | |
258 | manuf); | |
259 | ||
260 | return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X", | |
261 | devinfo.dcr, manuf, part, ext); | |
262 | } | |
263 | static DEVICE_ATTR_RO(modalias); | |
264 | ||
3a379bbc BB |
265 | static struct attribute *i3c_device_attrs[] = { |
266 | &dev_attr_bcr.attr, | |
267 | &dev_attr_dcr.attr, | |
268 | &dev_attr_pid.attr, | |
269 | &dev_attr_dynamic_address.attr, | |
270 | &dev_attr_hdrcap.attr, | |
7ec0ddb0 | 271 | &dev_attr_modalias.attr, |
3a379bbc BB |
272 | NULL, |
273 | }; | |
274 | ATTRIBUTE_GROUPS(i3c_device); | |
275 | ||
276 | static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env) | |
277 | { | |
278 | struct i3c_device *i3cdev = dev_to_i3cdev(dev); | |
279 | struct i3c_device_info devinfo; | |
280 | u16 manuf, part, ext; | |
281 | ||
282 | i3c_device_get_info(i3cdev, &devinfo); | |
283 | manuf = I3C_PID_MANUF_ID(devinfo.pid); | |
284 | part = I3C_PID_PART_ID(devinfo.pid); | |
285 | ext = I3C_PID_EXTRA_INFO(devinfo.pid); | |
286 | ||
287 | if (I3C_PID_RND_LOWER_32BITS(devinfo.pid)) | |
288 | return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04X", | |
289 | devinfo.dcr, manuf); | |
290 | ||
291 | return add_uevent_var(env, | |
12e21a23 | 292 | "MODALIAS=i3c:dcr%02Xmanuf%04Xpart%04Xext%04X", |
3a379bbc BB |
293 | devinfo.dcr, manuf, part, ext); |
294 | } | |
295 | ||
296 | static const struct device_type i3c_device_type = { | |
297 | .groups = i3c_device_groups, | |
298 | .uevent = i3c_device_uevent, | |
299 | }; | |
300 | ||
3a379bbc BB |
301 | static int i3c_device_match(struct device *dev, struct device_driver *drv) |
302 | { | |
303 | struct i3c_device *i3cdev; | |
304 | struct i3c_driver *i3cdrv; | |
305 | ||
306 | if (dev->type != &i3c_device_type) | |
307 | return 0; | |
308 | ||
309 | i3cdev = dev_to_i3cdev(dev); | |
310 | i3cdrv = drv_to_i3cdrv(drv); | |
311 | if (i3c_device_match_id(i3cdev, i3cdrv->id_table)) | |
312 | return 1; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int i3c_device_probe(struct device *dev) | |
318 | { | |
319 | struct i3c_device *i3cdev = dev_to_i3cdev(dev); | |
320 | struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); | |
321 | ||
322 | return driver->probe(i3cdev); | |
323 | } | |
324 | ||
fc7a6209 | 325 | static void i3c_device_remove(struct device *dev) |
3a379bbc BB |
326 | { |
327 | struct i3c_device *i3cdev = dev_to_i3cdev(dev); | |
328 | struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); | |
3a379bbc | 329 | |
dd926703 UKK |
330 | if (driver->remove) |
331 | driver->remove(i3cdev); | |
3a379bbc BB |
332 | |
333 | i3c_device_free_ibi(i3cdev); | |
3a379bbc BB |
334 | } |
335 | ||
336 | struct bus_type i3c_bus_type = { | |
337 | .name = "i3c", | |
338 | .match = i3c_device_match, | |
339 | .probe = i3c_device_probe, | |
340 | .remove = i3c_device_remove, | |
341 | }; | |
342 | ||
343 | static enum i3c_addr_slot_status | |
344 | i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) | |
345 | { | |
f18f9811 JI |
346 | unsigned long status; |
347 | int bitpos = addr * 2; | |
3a379bbc BB |
348 | |
349 | if (addr > I2C_MAX_ADDR) | |
350 | return I3C_ADDR_SLOT_RSVD; | |
351 | ||
352 | status = bus->addrslots[bitpos / BITS_PER_LONG]; | |
353 | status >>= bitpos % BITS_PER_LONG; | |
354 | ||
355 | return status & I3C_ADDR_SLOT_STATUS_MASK; | |
356 | } | |
357 | ||
358 | static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, | |
359 | enum i3c_addr_slot_status status) | |
360 | { | |
361 | int bitpos = addr * 2; | |
362 | unsigned long *ptr; | |
363 | ||
364 | if (addr > I2C_MAX_ADDR) | |
365 | return; | |
366 | ||
367 | ptr = bus->addrslots + (bitpos / BITS_PER_LONG); | |
476c7e1d DC |
368 | *ptr &= ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK << |
369 | (bitpos % BITS_PER_LONG)); | |
370 | *ptr |= (unsigned long)status << (bitpos % BITS_PER_LONG); | |
3a379bbc BB |
371 | } |
372 | ||
373 | static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr) | |
374 | { | |
375 | enum i3c_addr_slot_status status; | |
376 | ||
377 | status = i3c_bus_get_addr_slot_status(bus, addr); | |
378 | ||
379 | return status == I3C_ADDR_SLOT_FREE; | |
380 | } | |
381 | ||
382 | static int i3c_bus_get_free_addr(struct i3c_bus *bus, u8 start_addr) | |
383 | { | |
384 | enum i3c_addr_slot_status status; | |
385 | u8 addr; | |
386 | ||
387 | for (addr = start_addr; addr < I3C_MAX_ADDR; addr++) { | |
388 | status = i3c_bus_get_addr_slot_status(bus, addr); | |
389 | if (status == I3C_ADDR_SLOT_FREE) | |
390 | return addr; | |
391 | } | |
392 | ||
393 | return -ENOMEM; | |
394 | } | |
395 | ||
396 | static void i3c_bus_init_addrslots(struct i3c_bus *bus) | |
397 | { | |
398 | int i; | |
399 | ||
400 | /* Addresses 0 to 7 are reserved. */ | |
401 | for (i = 0; i < 8; i++) | |
402 | i3c_bus_set_addr_slot_status(bus, i, I3C_ADDR_SLOT_RSVD); | |
403 | ||
404 | /* | |
405 | * Reserve broadcast address and all addresses that might collide | |
406 | * with the broadcast address when facing a single bit error. | |
407 | */ | |
408 | i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR, | |
409 | I3C_ADDR_SLOT_RSVD); | |
410 | for (i = 0; i < 7; i++) | |
411 | i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR ^ BIT(i), | |
412 | I3C_ADDR_SLOT_RSVD); | |
413 | } | |
414 | ||
415 | static void i3c_bus_cleanup(struct i3c_bus *i3cbus) | |
416 | { | |
417 | mutex_lock(&i3c_core_lock); | |
418 | idr_remove(&i3c_bus_idr, i3cbus->id); | |
419 | mutex_unlock(&i3c_core_lock); | |
420 | } | |
421 | ||
422 | static int i3c_bus_init(struct i3c_bus *i3cbus) | |
423 | { | |
424 | int ret; | |
425 | ||
426 | init_rwsem(&i3cbus->lock); | |
427 | INIT_LIST_HEAD(&i3cbus->devs.i2c); | |
428 | INIT_LIST_HEAD(&i3cbus->devs.i3c); | |
429 | i3c_bus_init_addrslots(i3cbus); | |
430 | i3cbus->mode = I3C_BUS_MODE_PURE; | |
431 | ||
432 | mutex_lock(&i3c_core_lock); | |
433 | ret = idr_alloc(&i3c_bus_idr, i3cbus, 0, 0, GFP_KERNEL); | |
434 | mutex_unlock(&i3c_core_lock); | |
435 | ||
436 | if (ret < 0) | |
437 | return ret; | |
438 | ||
439 | i3cbus->id = ret; | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static const char * const i3c_bus_mode_strings[] = { | |
445 | [I3C_BUS_MODE_PURE] = "pure", | |
446 | [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast", | |
cbf4f732 | 447 | [I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited", |
3a379bbc BB |
448 | [I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow", |
449 | }; | |
450 | ||
451 | static ssize_t mode_show(struct device *dev, | |
452 | struct device_attribute *da, | |
453 | char *buf) | |
454 | { | |
455 | struct i3c_bus *i3cbus = dev_to_i3cbus(dev); | |
456 | ssize_t ret; | |
457 | ||
458 | i3c_bus_normaluse_lock(i3cbus); | |
459 | if (i3cbus->mode < 0 || | |
afe120c7 | 460 | i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) || |
3a379bbc BB |
461 | !i3c_bus_mode_strings[i3cbus->mode]) |
462 | ret = sprintf(buf, "unknown\n"); | |
463 | else | |
464 | ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]); | |
465 | i3c_bus_normaluse_unlock(i3cbus); | |
466 | ||
467 | return ret; | |
468 | } | |
469 | static DEVICE_ATTR_RO(mode); | |
470 | ||
471 | static ssize_t current_master_show(struct device *dev, | |
472 | struct device_attribute *da, | |
473 | char *buf) | |
474 | { | |
475 | struct i3c_bus *i3cbus = dev_to_i3cbus(dev); | |
476 | ssize_t ret; | |
477 | ||
478 | i3c_bus_normaluse_lock(i3cbus); | |
479 | ret = sprintf(buf, "%d-%llx\n", i3cbus->id, | |
480 | i3cbus->cur_master->info.pid); | |
481 | i3c_bus_normaluse_unlock(i3cbus); | |
482 | ||
483 | return ret; | |
484 | } | |
485 | static DEVICE_ATTR_RO(current_master); | |
486 | ||
487 | static ssize_t i3c_scl_frequency_show(struct device *dev, | |
488 | struct device_attribute *da, | |
489 | char *buf) | |
490 | { | |
491 | struct i3c_bus *i3cbus = dev_to_i3cbus(dev); | |
492 | ssize_t ret; | |
493 | ||
494 | i3c_bus_normaluse_lock(i3cbus); | |
495 | ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c); | |
496 | i3c_bus_normaluse_unlock(i3cbus); | |
497 | ||
498 | return ret; | |
499 | } | |
500 | static DEVICE_ATTR_RO(i3c_scl_frequency); | |
501 | ||
502 | static ssize_t i2c_scl_frequency_show(struct device *dev, | |
503 | struct device_attribute *da, | |
504 | char *buf) | |
505 | { | |
506 | struct i3c_bus *i3cbus = dev_to_i3cbus(dev); | |
507 | ssize_t ret; | |
508 | ||
509 | i3c_bus_normaluse_lock(i3cbus); | |
510 | ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c); | |
511 | i3c_bus_normaluse_unlock(i3cbus); | |
512 | ||
513 | return ret; | |
514 | } | |
515 | static DEVICE_ATTR_RO(i2c_scl_frequency); | |
516 | ||
517 | static struct attribute *i3c_masterdev_attrs[] = { | |
518 | &dev_attr_mode.attr, | |
519 | &dev_attr_current_master.attr, | |
520 | &dev_attr_i3c_scl_frequency.attr, | |
521 | &dev_attr_i2c_scl_frequency.attr, | |
522 | &dev_attr_bcr.attr, | |
523 | &dev_attr_dcr.attr, | |
524 | &dev_attr_pid.attr, | |
525 | &dev_attr_dynamic_address.attr, | |
526 | &dev_attr_hdrcap.attr, | |
527 | NULL, | |
528 | }; | |
529 | ATTRIBUTE_GROUPS(i3c_masterdev); | |
530 | ||
531 | static void i3c_masterdev_release(struct device *dev) | |
532 | { | |
533 | struct i3c_master_controller *master = dev_to_i3cmaster(dev); | |
534 | struct i3c_bus *bus = dev_to_i3cbus(dev); | |
535 | ||
536 | if (master->wq) | |
537 | destroy_workqueue(master->wq); | |
538 | ||
539 | WARN_ON(!list_empty(&bus->devs.i2c) || !list_empty(&bus->devs.i3c)); | |
540 | i3c_bus_cleanup(bus); | |
541 | ||
542 | of_node_put(dev->of_node); | |
543 | } | |
544 | ||
545 | static const struct device_type i3c_masterdev_type = { | |
546 | .groups = i3c_masterdev_groups, | |
547 | }; | |
548 | ||
026d8450 BG |
549 | static int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode, |
550 | unsigned long max_i2c_scl_rate) | |
3a379bbc | 551 | { |
ecc8fb54 | 552 | struct i3c_master_controller *master = i3c_bus_to_i3c_master(i3cbus); |
3a379bbc | 553 | |
ecc8fb54 | 554 | i3cbus->mode = mode; |
3a379bbc | 555 | |
ecc8fb54 VS |
556 | switch (i3cbus->mode) { |
557 | case I3C_BUS_MODE_PURE: | |
558 | if (!i3cbus->scl_rate.i3c) | |
559 | i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; | |
560 | break; | |
561 | case I3C_BUS_MODE_MIXED_FAST: | |
cbf4f732 | 562 | case I3C_BUS_MODE_MIXED_LIMITED: |
ecc8fb54 VS |
563 | if (!i3cbus->scl_rate.i3c) |
564 | i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; | |
565 | if (!i3cbus->scl_rate.i2c) | |
566 | i3cbus->scl_rate.i2c = max_i2c_scl_rate; | |
567 | break; | |
568 | case I3C_BUS_MODE_MIXED_SLOW: | |
569 | if (!i3cbus->scl_rate.i2c) | |
570 | i3cbus->scl_rate.i2c = max_i2c_scl_rate; | |
571 | if (!i3cbus->scl_rate.i3c || | |
572 | i3cbus->scl_rate.i3c > i3cbus->scl_rate.i2c) | |
573 | i3cbus->scl_rate.i3c = i3cbus->scl_rate.i2c; | |
574 | break; | |
575 | default: | |
576 | return -EINVAL; | |
3a379bbc BB |
577 | } |
578 | ||
ecc8fb54 VS |
579 | dev_dbg(&master->dev, "i2c-scl = %ld Hz i3c-scl = %ld Hz\n", |
580 | i3cbus->scl_rate.i2c, i3cbus->scl_rate.i3c); | |
581 | ||
3a379bbc BB |
582 | /* |
583 | * I3C/I2C frequency may have been overridden, check that user-provided | |
584 | * values are not exceeding max possible frequency. | |
585 | */ | |
586 | if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE || | |
587 | i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE) | |
588 | return -EINVAL; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | static struct i3c_master_controller * | |
594 | i2c_adapter_to_i3c_master(struct i2c_adapter *adap) | |
595 | { | |
596 | return container_of(adap, struct i3c_master_controller, i2c); | |
597 | } | |
598 | ||
599 | static struct i2c_adapter * | |
600 | i3c_master_to_i2c_adapter(struct i3c_master_controller *master) | |
601 | { | |
602 | return &master->i2c; | |
603 | } | |
604 | ||
605 | static void i3c_master_free_i2c_dev(struct i2c_dev_desc *dev) | |
606 | { | |
607 | kfree(dev); | |
608 | } | |
609 | ||
610 | static struct i2c_dev_desc * | |
611 | i3c_master_alloc_i2c_dev(struct i3c_master_controller *master, | |
31b9887c | 612 | u16 addr, u8 lvr) |
3a379bbc BB |
613 | { |
614 | struct i2c_dev_desc *dev; | |
615 | ||
616 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
617 | if (!dev) | |
618 | return ERR_PTR(-ENOMEM); | |
619 | ||
620 | dev->common.master = master; | |
31b9887c JI |
621 | dev->addr = addr; |
622 | dev->lvr = lvr; | |
3a379bbc BB |
623 | |
624 | return dev; | |
625 | } | |
626 | ||
627 | static void *i3c_ccc_cmd_dest_init(struct i3c_ccc_cmd_dest *dest, u8 addr, | |
628 | u16 payloadlen) | |
629 | { | |
630 | dest->addr = addr; | |
631 | dest->payload.len = payloadlen; | |
632 | if (payloadlen) | |
633 | dest->payload.data = kzalloc(payloadlen, GFP_KERNEL); | |
634 | else | |
635 | dest->payload.data = NULL; | |
636 | ||
637 | return dest->payload.data; | |
638 | } | |
639 | ||
640 | static void i3c_ccc_cmd_dest_cleanup(struct i3c_ccc_cmd_dest *dest) | |
641 | { | |
642 | kfree(dest->payload.data); | |
643 | } | |
644 | ||
645 | static void i3c_ccc_cmd_init(struct i3c_ccc_cmd *cmd, bool rnw, u8 id, | |
646 | struct i3c_ccc_cmd_dest *dests, | |
647 | unsigned int ndests) | |
648 | { | |
649 | cmd->rnw = rnw ? 1 : 0; | |
650 | cmd->id = id; | |
651 | cmd->dests = dests; | |
652 | cmd->ndests = ndests; | |
653 | cmd->err = I3C_ERROR_UNKNOWN; | |
654 | } | |
655 | ||
656 | static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master, | |
657 | struct i3c_ccc_cmd *cmd) | |
658 | { | |
659 | int ret; | |
660 | ||
661 | if (!cmd || !master) | |
662 | return -EINVAL; | |
663 | ||
664 | if (WARN_ON(master->init_done && | |
665 | !rwsem_is_locked(&master->bus.lock))) | |
666 | return -EINVAL; | |
667 | ||
668 | if (!master->ops->send_ccc_cmd) | |
669 | return -ENOTSUPP; | |
670 | ||
671 | if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests)) | |
672 | return -EINVAL; | |
673 | ||
674 | if (master->ops->supports_ccc_cmd && | |
675 | !master->ops->supports_ccc_cmd(master, cmd)) | |
676 | return -ENOTSUPP; | |
677 | ||
678 | ret = master->ops->send_ccc_cmd(master, cmd); | |
679 | if (ret) { | |
680 | if (cmd->err != I3C_ERROR_UNKNOWN) | |
681 | return cmd->err; | |
682 | ||
683 | return ret; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static struct i2c_dev_desc * | |
690 | i3c_master_find_i2c_dev_by_addr(const struct i3c_master_controller *master, | |
691 | u16 addr) | |
692 | { | |
693 | struct i2c_dev_desc *dev; | |
694 | ||
695 | i3c_bus_for_each_i2cdev(&master->bus, dev) { | |
31b9887c | 696 | if (dev->addr == addr) |
3a379bbc BB |
697 | return dev; |
698 | } | |
699 | ||
700 | return NULL; | |
701 | } | |
702 | ||
703 | /** | |
704 | * i3c_master_get_free_addr() - get a free address on the bus | |
705 | * @master: I3C master object | |
706 | * @start_addr: where to start searching | |
707 | * | |
708 | * This function must be called with the bus lock held in write mode. | |
709 | * | |
710 | * Return: the first free address starting at @start_addr (included) or -ENOMEM | |
711 | * if there's no more address available. | |
712 | */ | |
713 | int i3c_master_get_free_addr(struct i3c_master_controller *master, | |
714 | u8 start_addr) | |
715 | { | |
716 | return i3c_bus_get_free_addr(&master->bus, start_addr); | |
717 | } | |
718 | EXPORT_SYMBOL_GPL(i3c_master_get_free_addr); | |
719 | ||
720 | static void i3c_device_release(struct device *dev) | |
721 | { | |
722 | struct i3c_device *i3cdev = dev_to_i3cdev(dev); | |
723 | ||
724 | WARN_ON(i3cdev->desc); | |
725 | ||
726 | of_node_put(i3cdev->dev.of_node); | |
727 | kfree(i3cdev); | |
728 | } | |
729 | ||
730 | static void i3c_master_free_i3c_dev(struct i3c_dev_desc *dev) | |
731 | { | |
732 | kfree(dev); | |
733 | } | |
734 | ||
735 | static struct i3c_dev_desc * | |
736 | i3c_master_alloc_i3c_dev(struct i3c_master_controller *master, | |
737 | const struct i3c_device_info *info) | |
738 | { | |
739 | struct i3c_dev_desc *dev; | |
740 | ||
741 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
742 | if (!dev) | |
743 | return ERR_PTR(-ENOMEM); | |
744 | ||
745 | dev->common.master = master; | |
746 | dev->info = *info; | |
747 | mutex_init(&dev->ibi_lock); | |
748 | ||
749 | return dev; | |
750 | } | |
751 | ||
752 | static int i3c_master_rstdaa_locked(struct i3c_master_controller *master, | |
753 | u8 addr) | |
754 | { | |
755 | enum i3c_addr_slot_status addrstat; | |
756 | struct i3c_ccc_cmd_dest dest; | |
757 | struct i3c_ccc_cmd cmd; | |
758 | int ret; | |
759 | ||
760 | if (!master) | |
761 | return -EINVAL; | |
762 | ||
763 | addrstat = i3c_bus_get_addr_slot_status(&master->bus, addr); | |
764 | if (addr != I3C_BROADCAST_ADDR && addrstat != I3C_ADDR_SLOT_I3C_DEV) | |
765 | return -EINVAL; | |
766 | ||
767 | i3c_ccc_cmd_dest_init(&dest, addr, 0); | |
768 | i3c_ccc_cmd_init(&cmd, false, | |
769 | I3C_CCC_RSTDAA(addr == I3C_BROADCAST_ADDR), | |
770 | &dest, 1); | |
771 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
772 | i3c_ccc_cmd_dest_cleanup(&dest); | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
777 | /** | |
778 | * i3c_master_entdaa_locked() - start a DAA (Dynamic Address Assignment) | |
779 | * procedure | |
780 | * @master: master used to send frames on the bus | |
781 | * | |
782 | * Send a ENTDAA CCC command to start a DAA procedure. | |
783 | * | |
784 | * Note that this function only sends the ENTDAA CCC command, all the logic | |
785 | * behind dynamic address assignment has to be handled in the I3C master | |
786 | * driver. | |
787 | * | |
788 | * This function must be called with the bus lock held in write mode. | |
789 | * | |
790 | * Return: 0 in case of success, a positive I3C error code if the error is | |
791 | * one of the official Mx error codes, and a negative error code otherwise. | |
792 | */ | |
793 | int i3c_master_entdaa_locked(struct i3c_master_controller *master) | |
794 | { | |
795 | struct i3c_ccc_cmd_dest dest; | |
796 | struct i3c_ccc_cmd cmd; | |
797 | int ret; | |
798 | ||
799 | i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, 0); | |
800 | i3c_ccc_cmd_init(&cmd, false, I3C_CCC_ENTDAA, &dest, 1); | |
801 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
802 | i3c_ccc_cmd_dest_cleanup(&dest); | |
803 | ||
804 | return ret; | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(i3c_master_entdaa_locked); | |
807 | ||
808 | static int i3c_master_enec_disec_locked(struct i3c_master_controller *master, | |
809 | u8 addr, bool enable, u8 evts) | |
810 | { | |
811 | struct i3c_ccc_events *events; | |
812 | struct i3c_ccc_cmd_dest dest; | |
813 | struct i3c_ccc_cmd cmd; | |
814 | int ret; | |
815 | ||
816 | events = i3c_ccc_cmd_dest_init(&dest, addr, sizeof(*events)); | |
817 | if (!events) | |
818 | return -ENOMEM; | |
819 | ||
820 | events->events = evts; | |
821 | i3c_ccc_cmd_init(&cmd, false, | |
822 | enable ? | |
823 | I3C_CCC_ENEC(addr == I3C_BROADCAST_ADDR) : | |
824 | I3C_CCC_DISEC(addr == I3C_BROADCAST_ADDR), | |
825 | &dest, 1); | |
826 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
827 | i3c_ccc_cmd_dest_cleanup(&dest); | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
832 | /** | |
833 | * i3c_master_disec_locked() - send a DISEC CCC command | |
834 | * @master: master used to send frames on the bus | |
835 | * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR | |
836 | * @evts: events to disable | |
837 | * | |
838 | * Send a DISEC CCC command to disable some or all events coming from a | |
839 | * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. | |
840 | * | |
841 | * This function must be called with the bus lock held in write mode. | |
842 | * | |
843 | * Return: 0 in case of success, a positive I3C error code if the error is | |
844 | * one of the official Mx error codes, and a negative error code otherwise. | |
845 | */ | |
846 | int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr, | |
847 | u8 evts) | |
848 | { | |
849 | return i3c_master_enec_disec_locked(master, addr, false, evts); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(i3c_master_disec_locked); | |
852 | ||
853 | /** | |
854 | * i3c_master_enec_locked() - send an ENEC CCC command | |
855 | * @master: master used to send frames on the bus | |
856 | * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR | |
857 | * @evts: events to disable | |
858 | * | |
859 | * Sends an ENEC CCC command to enable some or all events coming from a | |
860 | * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. | |
861 | * | |
862 | * This function must be called with the bus lock held in write mode. | |
863 | * | |
864 | * Return: 0 in case of success, a positive I3C error code if the error is | |
865 | * one of the official Mx error codes, and a negative error code otherwise. | |
866 | */ | |
867 | int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr, | |
868 | u8 evts) | |
869 | { | |
870 | return i3c_master_enec_disec_locked(master, addr, true, evts); | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(i3c_master_enec_locked); | |
873 | ||
874 | /** | |
875 | * i3c_master_defslvs_locked() - send a DEFSLVS CCC command | |
876 | * @master: master used to send frames on the bus | |
877 | * | |
878 | * Send a DEFSLVS CCC command containing all the devices known to the @master. | |
879 | * This is useful when you have secondary masters on the bus to propagate | |
880 | * device information. | |
881 | * | |
882 | * This should be called after all I3C devices have been discovered (in other | |
883 | * words, after the DAA procedure has finished) and instantiated in | |
884 | * &i3c_master_controller_ops->bus_init(). | |
885 | * It should also be called if a master ACKed an Hot-Join request and assigned | |
886 | * a dynamic address to the device joining the bus. | |
887 | * | |
888 | * This function must be called with the bus lock held in write mode. | |
889 | * | |
890 | * Return: 0 in case of success, a positive I3C error code if the error is | |
891 | * one of the official Mx error codes, and a negative error code otherwise. | |
892 | */ | |
893 | int i3c_master_defslvs_locked(struct i3c_master_controller *master) | |
894 | { | |
895 | struct i3c_ccc_defslvs *defslvs; | |
896 | struct i3c_ccc_dev_desc *desc; | |
897 | struct i3c_ccc_cmd_dest dest; | |
898 | struct i3c_dev_desc *i3cdev; | |
899 | struct i2c_dev_desc *i2cdev; | |
900 | struct i3c_ccc_cmd cmd; | |
901 | struct i3c_bus *bus; | |
902 | bool send = false; | |
903 | int ndevs = 0, ret; | |
904 | ||
905 | if (!master) | |
906 | return -EINVAL; | |
907 | ||
908 | bus = i3c_master_get_bus(master); | |
909 | i3c_bus_for_each_i3cdev(bus, i3cdev) { | |
910 | ndevs++; | |
911 | ||
912 | if (i3cdev == master->this) | |
913 | continue; | |
914 | ||
915 | if (I3C_BCR_DEVICE_ROLE(i3cdev->info.bcr) == | |
916 | I3C_BCR_I3C_MASTER) | |
917 | send = true; | |
918 | } | |
919 | ||
920 | /* No other master on the bus, skip DEFSLVS. */ | |
921 | if (!send) | |
922 | return 0; | |
923 | ||
924 | i3c_bus_for_each_i2cdev(bus, i2cdev) | |
925 | ndevs++; | |
926 | ||
927 | defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, | |
ede20015 GS |
928 | struct_size(defslvs, slaves, |
929 | ndevs - 1)); | |
3a379bbc BB |
930 | if (!defslvs) |
931 | return -ENOMEM; | |
932 | ||
933 | defslvs->count = ndevs; | |
934 | defslvs->master.bcr = master->this->info.bcr; | |
935 | defslvs->master.dcr = master->this->info.dcr; | |
936 | defslvs->master.dyn_addr = master->this->info.dyn_addr << 1; | |
937 | defslvs->master.static_addr = I3C_BROADCAST_ADDR << 1; | |
938 | ||
939 | desc = defslvs->slaves; | |
940 | i3c_bus_for_each_i2cdev(bus, i2cdev) { | |
b1ac3a4b PG |
941 | desc->lvr = i2cdev->lvr; |
942 | desc->static_addr = i2cdev->addr << 1; | |
3a379bbc BB |
943 | desc++; |
944 | } | |
945 | ||
946 | i3c_bus_for_each_i3cdev(bus, i3cdev) { | |
947 | /* Skip the I3C dev representing this master. */ | |
948 | if (i3cdev == master->this) | |
949 | continue; | |
950 | ||
951 | desc->bcr = i3cdev->info.bcr; | |
952 | desc->dcr = i3cdev->info.dcr; | |
953 | desc->dyn_addr = i3cdev->info.dyn_addr << 1; | |
954 | desc->static_addr = i3cdev->info.static_addr << 1; | |
955 | desc++; | |
956 | } | |
957 | ||
958 | i3c_ccc_cmd_init(&cmd, false, I3C_CCC_DEFSLVS, &dest, 1); | |
959 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
960 | i3c_ccc_cmd_dest_cleanup(&dest); | |
961 | ||
962 | return ret; | |
963 | } | |
964 | EXPORT_SYMBOL_GPL(i3c_master_defslvs_locked); | |
965 | ||
966 | static int i3c_master_setda_locked(struct i3c_master_controller *master, | |
967 | u8 oldaddr, u8 newaddr, bool setdasa) | |
968 | { | |
969 | struct i3c_ccc_cmd_dest dest; | |
970 | struct i3c_ccc_setda *setda; | |
971 | struct i3c_ccc_cmd cmd; | |
972 | int ret; | |
973 | ||
974 | if (!oldaddr || !newaddr) | |
975 | return -EINVAL; | |
976 | ||
977 | setda = i3c_ccc_cmd_dest_init(&dest, oldaddr, sizeof(*setda)); | |
978 | if (!setda) | |
979 | return -ENOMEM; | |
980 | ||
981 | setda->addr = newaddr << 1; | |
982 | i3c_ccc_cmd_init(&cmd, false, | |
983 | setdasa ? I3C_CCC_SETDASA : I3C_CCC_SETNEWDA, | |
984 | &dest, 1); | |
985 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
986 | i3c_ccc_cmd_dest_cleanup(&dest); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
991 | static int i3c_master_setdasa_locked(struct i3c_master_controller *master, | |
992 | u8 static_addr, u8 dyn_addr) | |
993 | { | |
994 | return i3c_master_setda_locked(master, static_addr, dyn_addr, true); | |
995 | } | |
996 | ||
997 | static int i3c_master_setnewda_locked(struct i3c_master_controller *master, | |
998 | u8 oldaddr, u8 newaddr) | |
999 | { | |
1000 | return i3c_master_setda_locked(master, oldaddr, newaddr, false); | |
1001 | } | |
1002 | ||
1003 | static int i3c_master_getmrl_locked(struct i3c_master_controller *master, | |
1004 | struct i3c_device_info *info) | |
1005 | { | |
1006 | struct i3c_ccc_cmd_dest dest; | |
3a379bbc BB |
1007 | struct i3c_ccc_mrl *mrl; |
1008 | struct i3c_ccc_cmd cmd; | |
1009 | int ret; | |
1010 | ||
1011 | mrl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mrl)); | |
1012 | if (!mrl) | |
1013 | return -ENOMEM; | |
1014 | ||
1015 | /* | |
1016 | * When the device does not have IBI payload GETMRL only returns 2 | |
1017 | * bytes of data. | |
1018 | */ | |
1019 | if (!(info->bcr & I3C_BCR_IBI_PAYLOAD)) | |
1020 | dest.payload.len -= 1; | |
1021 | ||
3a379bbc BB |
1022 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1); |
1023 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1024 | if (ret) | |
1025 | goto out; | |
1026 | ||
b4203ce0 NP |
1027 | switch (dest.payload.len) { |
1028 | case 3: | |
1029 | info->max_ibi_len = mrl->ibi_len; | |
1030 | fallthrough; | |
1031 | case 2: | |
1032 | info->max_read_len = be16_to_cpu(mrl->read_len); | |
1033 | break; | |
1034 | default: | |
3a379bbc BB |
1035 | ret = -EIO; |
1036 | goto out; | |
1037 | } | |
1038 | ||
3a379bbc BB |
1039 | out: |
1040 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | ||
1045 | static int i3c_master_getmwl_locked(struct i3c_master_controller *master, | |
1046 | struct i3c_device_info *info) | |
1047 | { | |
1048 | struct i3c_ccc_cmd_dest dest; | |
1049 | struct i3c_ccc_mwl *mwl; | |
1050 | struct i3c_ccc_cmd cmd; | |
1051 | int ret; | |
1052 | ||
1053 | mwl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mwl)); | |
1054 | if (!mwl) | |
1055 | return -ENOMEM; | |
1056 | ||
1057 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMWL, &dest, 1); | |
1058 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1059 | if (ret) | |
1060 | goto out; | |
1061 | ||
7afe9a4e WW |
1062 | if (dest.payload.len != sizeof(*mwl)) { |
1063 | ret = -EIO; | |
1064 | goto out; | |
1065 | } | |
3a379bbc BB |
1066 | |
1067 | info->max_write_len = be16_to_cpu(mwl->len); | |
1068 | ||
1069 | out: | |
1070 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1071 | ||
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | static int i3c_master_getmxds_locked(struct i3c_master_controller *master, | |
1076 | struct i3c_device_info *info) | |
1077 | { | |
1078 | struct i3c_ccc_getmxds *getmaxds; | |
1079 | struct i3c_ccc_cmd_dest dest; | |
1080 | struct i3c_ccc_cmd cmd; | |
1081 | int ret; | |
1082 | ||
1083 | getmaxds = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, | |
1084 | sizeof(*getmaxds)); | |
1085 | if (!getmaxds) | |
1086 | return -ENOMEM; | |
1087 | ||
1088 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMXDS, &dest, 1); | |
1089 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1090 | if (ret) | |
1091 | goto out; | |
1092 | ||
1093 | if (dest.payload.len != 2 && dest.payload.len != 5) { | |
1094 | ret = -EIO; | |
1095 | goto out; | |
1096 | } | |
1097 | ||
1098 | info->max_read_ds = getmaxds->maxrd; | |
1099 | info->max_write_ds = getmaxds->maxwr; | |
1100 | if (dest.payload.len == 5) | |
1101 | info->max_read_turnaround = getmaxds->maxrdturn[0] | | |
1102 | ((u32)getmaxds->maxrdturn[1] << 8) | | |
1103 | ((u32)getmaxds->maxrdturn[2] << 16); | |
1104 | ||
1105 | out: | |
1106 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1107 | ||
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | static int i3c_master_gethdrcap_locked(struct i3c_master_controller *master, | |
1112 | struct i3c_device_info *info) | |
1113 | { | |
1114 | struct i3c_ccc_gethdrcap *gethdrcap; | |
1115 | struct i3c_ccc_cmd_dest dest; | |
1116 | struct i3c_ccc_cmd cmd; | |
1117 | int ret; | |
1118 | ||
1119 | gethdrcap = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, | |
1120 | sizeof(*gethdrcap)); | |
1121 | if (!gethdrcap) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETHDRCAP, &dest, 1); | |
1125 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1126 | if (ret) | |
1127 | goto out; | |
1128 | ||
1129 | if (dest.payload.len != 1) { | |
1130 | ret = -EIO; | |
1131 | goto out; | |
1132 | } | |
1133 | ||
1134 | info->hdr_cap = gethdrcap->modes; | |
1135 | ||
1136 | out: | |
1137 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1138 | ||
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static int i3c_master_getpid_locked(struct i3c_master_controller *master, | |
1143 | struct i3c_device_info *info) | |
1144 | { | |
1145 | struct i3c_ccc_getpid *getpid; | |
1146 | struct i3c_ccc_cmd_dest dest; | |
1147 | struct i3c_ccc_cmd cmd; | |
1148 | int ret, i; | |
1149 | ||
1150 | getpid = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getpid)); | |
1151 | if (!getpid) | |
1152 | return -ENOMEM; | |
1153 | ||
1154 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETPID, &dest, 1); | |
1155 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1156 | if (ret) | |
1157 | goto out; | |
1158 | ||
1159 | info->pid = 0; | |
1160 | for (i = 0; i < sizeof(getpid->pid); i++) { | |
1161 | int sft = (sizeof(getpid->pid) - i - 1) * 8; | |
1162 | ||
1163 | info->pid |= (u64)getpid->pid[i] << sft; | |
1164 | } | |
1165 | ||
1166 | out: | |
1167 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1168 | ||
1169 | return ret; | |
1170 | } | |
1171 | ||
1172 | static int i3c_master_getbcr_locked(struct i3c_master_controller *master, | |
1173 | struct i3c_device_info *info) | |
1174 | { | |
1175 | struct i3c_ccc_getbcr *getbcr; | |
1176 | struct i3c_ccc_cmd_dest dest; | |
1177 | struct i3c_ccc_cmd cmd; | |
1178 | int ret; | |
1179 | ||
1180 | getbcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getbcr)); | |
1181 | if (!getbcr) | |
1182 | return -ENOMEM; | |
1183 | ||
1184 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETBCR, &dest, 1); | |
1185 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1186 | if (ret) | |
1187 | goto out; | |
1188 | ||
1189 | info->bcr = getbcr->bcr; | |
1190 | ||
1191 | out: | |
1192 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1193 | ||
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static int i3c_master_getdcr_locked(struct i3c_master_controller *master, | |
1198 | struct i3c_device_info *info) | |
1199 | { | |
1200 | struct i3c_ccc_getdcr *getdcr; | |
1201 | struct i3c_ccc_cmd_dest dest; | |
1202 | struct i3c_ccc_cmd cmd; | |
1203 | int ret; | |
1204 | ||
1205 | getdcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getdcr)); | |
1206 | if (!getdcr) | |
1207 | return -ENOMEM; | |
1208 | ||
1209 | i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETDCR, &dest, 1); | |
1210 | ret = i3c_master_send_ccc_cmd_locked(master, &cmd); | |
1211 | if (ret) | |
1212 | goto out; | |
1213 | ||
1214 | info->dcr = getdcr->dcr; | |
1215 | ||
1216 | out: | |
1217 | i3c_ccc_cmd_dest_cleanup(&dest); | |
1218 | ||
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | static int i3c_master_retrieve_dev_info(struct i3c_dev_desc *dev) | |
1223 | { | |
1224 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
1225 | enum i3c_addr_slot_status slot_status; | |
1226 | int ret; | |
1227 | ||
1228 | if (!dev->info.dyn_addr) | |
1229 | return -EINVAL; | |
1230 | ||
1231 | slot_status = i3c_bus_get_addr_slot_status(&master->bus, | |
1232 | dev->info.dyn_addr); | |
1233 | if (slot_status == I3C_ADDR_SLOT_RSVD || | |
1234 | slot_status == I3C_ADDR_SLOT_I2C_DEV) | |
1235 | return -EINVAL; | |
1236 | ||
1237 | ret = i3c_master_getpid_locked(master, &dev->info); | |
1238 | if (ret) | |
1239 | return ret; | |
1240 | ||
1241 | ret = i3c_master_getbcr_locked(master, &dev->info); | |
1242 | if (ret) | |
1243 | return ret; | |
1244 | ||
1245 | ret = i3c_master_getdcr_locked(master, &dev->info); | |
1246 | if (ret) | |
1247 | return ret; | |
1248 | ||
1249 | if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM) { | |
1250 | ret = i3c_master_getmxds_locked(master, &dev->info); | |
1251 | if (ret) | |
1252 | return ret; | |
1253 | } | |
1254 | ||
1255 | if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD) | |
1256 | dev->info.max_ibi_len = 1; | |
1257 | ||
1258 | i3c_master_getmrl_locked(master, &dev->info); | |
1259 | i3c_master_getmwl_locked(master, &dev->info); | |
1260 | ||
1261 | if (dev->info.bcr & I3C_BCR_HDR_CAP) { | |
1262 | ret = i3c_master_gethdrcap_locked(master, &dev->info); | |
1263 | if (ret) | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static void i3c_master_put_i3c_addrs(struct i3c_dev_desc *dev) | |
1271 | { | |
1272 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
1273 | ||
1274 | if (dev->info.static_addr) | |
1275 | i3c_bus_set_addr_slot_status(&master->bus, | |
1276 | dev->info.static_addr, | |
1277 | I3C_ADDR_SLOT_FREE); | |
1278 | ||
1279 | if (dev->info.dyn_addr) | |
1280 | i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, | |
1281 | I3C_ADDR_SLOT_FREE); | |
1282 | ||
1283 | if (dev->boardinfo && dev->boardinfo->init_dyn_addr) | |
1284 | i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, | |
1285 | I3C_ADDR_SLOT_FREE); | |
1286 | } | |
1287 | ||
1288 | static int i3c_master_get_i3c_addrs(struct i3c_dev_desc *dev) | |
1289 | { | |
1290 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
1291 | enum i3c_addr_slot_status status; | |
1292 | ||
1293 | if (!dev->info.static_addr && !dev->info.dyn_addr) | |
1294 | return 0; | |
1295 | ||
1296 | if (dev->info.static_addr) { | |
1297 | status = i3c_bus_get_addr_slot_status(&master->bus, | |
1298 | dev->info.static_addr); | |
1299 | if (status != I3C_ADDR_SLOT_FREE) | |
1300 | return -EBUSY; | |
1301 | ||
1302 | i3c_bus_set_addr_slot_status(&master->bus, | |
1303 | dev->info.static_addr, | |
1304 | I3C_ADDR_SLOT_I3C_DEV); | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * ->init_dyn_addr should have been reserved before that, so, if we're | |
1309 | * trying to apply a pre-reserved dynamic address, we should not try | |
1310 | * to reserve the address slot a second time. | |
1311 | */ | |
1312 | if (dev->info.dyn_addr && | |
1313 | (!dev->boardinfo || | |
1314 | dev->boardinfo->init_dyn_addr != dev->info.dyn_addr)) { | |
1315 | status = i3c_bus_get_addr_slot_status(&master->bus, | |
1316 | dev->info.dyn_addr); | |
1317 | if (status != I3C_ADDR_SLOT_FREE) | |
1318 | goto err_release_static_addr; | |
1319 | ||
1320 | i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, | |
1321 | I3C_ADDR_SLOT_I3C_DEV); | |
1322 | } | |
1323 | ||
1324 | return 0; | |
1325 | ||
1326 | err_release_static_addr: | |
1327 | if (dev->info.static_addr) | |
1328 | i3c_bus_set_addr_slot_status(&master->bus, | |
1329 | dev->info.static_addr, | |
1330 | I3C_ADDR_SLOT_FREE); | |
1331 | ||
1332 | return -EBUSY; | |
1333 | } | |
1334 | ||
1335 | static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master, | |
1336 | struct i3c_dev_desc *dev) | |
1337 | { | |
1338 | int ret; | |
1339 | ||
1340 | /* | |
1341 | * We don't attach devices to the controller until they are | |
1342 | * addressable on the bus. | |
1343 | */ | |
1344 | if (!dev->info.static_addr && !dev->info.dyn_addr) | |
1345 | return 0; | |
1346 | ||
1347 | ret = i3c_master_get_i3c_addrs(dev); | |
1348 | if (ret) | |
1349 | return ret; | |
1350 | ||
1351 | /* Do not attach the master device itself. */ | |
1352 | if (master->this != dev && master->ops->attach_i3c_dev) { | |
1353 | ret = master->ops->attach_i3c_dev(dev); | |
1354 | if (ret) { | |
1355 | i3c_master_put_i3c_addrs(dev); | |
1356 | return ret; | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | list_add_tail(&dev->common.node, &master->bus.devs.i3c); | |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, | |
1366 | u8 old_dyn_addr) | |
1367 | { | |
1368 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
1369 | enum i3c_addr_slot_status status; | |
1370 | int ret; | |
1371 | ||
cc3a392d PT |
1372 | if (dev->info.dyn_addr != old_dyn_addr && |
1373 | (!dev->boardinfo || | |
1374 | dev->info.dyn_addr != dev->boardinfo->init_dyn_addr)) { | |
3a379bbc BB |
1375 | status = i3c_bus_get_addr_slot_status(&master->bus, |
1376 | dev->info.dyn_addr); | |
1377 | if (status != I3C_ADDR_SLOT_FREE) | |
1378 | return -EBUSY; | |
1379 | i3c_bus_set_addr_slot_status(&master->bus, | |
1380 | dev->info.dyn_addr, | |
1381 | I3C_ADDR_SLOT_I3C_DEV); | |
1382 | } | |
1383 | ||
1384 | if (master->ops->reattach_i3c_dev) { | |
1385 | ret = master->ops->reattach_i3c_dev(dev, old_dyn_addr); | |
1386 | if (ret) { | |
1387 | i3c_master_put_i3c_addrs(dev); | |
1388 | return ret; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static void i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev) | |
1396 | { | |
1397 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
1398 | ||
1399 | /* Do not detach the master device itself. */ | |
1400 | if (master->this != dev && master->ops->detach_i3c_dev) | |
1401 | master->ops->detach_i3c_dev(dev); | |
1402 | ||
1403 | i3c_master_put_i3c_addrs(dev); | |
1404 | list_del(&dev->common.node); | |
1405 | } | |
1406 | ||
1407 | static int i3c_master_attach_i2c_dev(struct i3c_master_controller *master, | |
1408 | struct i2c_dev_desc *dev) | |
1409 | { | |
1410 | int ret; | |
1411 | ||
1412 | if (master->ops->attach_i2c_dev) { | |
1413 | ret = master->ops->attach_i2c_dev(dev); | |
1414 | if (ret) | |
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | list_add_tail(&dev->common.node, &master->bus.devs.i2c); | |
1419 | ||
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static void i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev) | |
1424 | { | |
1425 | struct i3c_master_controller *master = i2c_dev_get_master(dev); | |
1426 | ||
1427 | list_del(&dev->common.node); | |
1428 | ||
1429 | if (master->ops->detach_i2c_dev) | |
1430 | master->ops->detach_i2c_dev(dev); | |
1431 | } | |
1432 | ||
cc3a392d PT |
1433 | static int i3c_master_early_i3c_dev_add(struct i3c_master_controller *master, |
1434 | struct i3c_dev_boardinfo *boardinfo) | |
3a379bbc | 1435 | { |
cc3a392d PT |
1436 | struct i3c_device_info info = { |
1437 | .static_addr = boardinfo->static_addr, | |
1438 | }; | |
1439 | struct i3c_dev_desc *i3cdev; | |
3a379bbc BB |
1440 | int ret; |
1441 | ||
cc3a392d PT |
1442 | i3cdev = i3c_master_alloc_i3c_dev(master, &info); |
1443 | if (IS_ERR(i3cdev)) | |
1444 | return -ENOMEM; | |
3a379bbc | 1445 | |
cc3a392d PT |
1446 | i3cdev->boardinfo = boardinfo; |
1447 | ||
1448 | ret = i3c_master_attach_i3c_dev(master, i3cdev); | |
3a379bbc | 1449 | if (ret) |
cc3a392d | 1450 | goto err_free_dev; |
3a379bbc | 1451 | |
cc3a392d PT |
1452 | ret = i3c_master_setdasa_locked(master, i3cdev->info.static_addr, |
1453 | i3cdev->boardinfo->init_dyn_addr); | |
1454 | if (ret) | |
1455 | goto err_detach_dev; | |
1456 | ||
1457 | i3cdev->info.dyn_addr = i3cdev->boardinfo->init_dyn_addr; | |
1458 | ret = i3c_master_reattach_i3c_dev(i3cdev, 0); | |
3a379bbc BB |
1459 | if (ret) |
1460 | goto err_rstdaa; | |
1461 | ||
cc3a392d | 1462 | ret = i3c_master_retrieve_dev_info(i3cdev); |
3a379bbc BB |
1463 | if (ret) |
1464 | goto err_rstdaa; | |
1465 | ||
cc3a392d | 1466 | return 0; |
3a379bbc BB |
1467 | |
1468 | err_rstdaa: | |
cc3a392d PT |
1469 | i3c_master_rstdaa_locked(master, i3cdev->boardinfo->init_dyn_addr); |
1470 | err_detach_dev: | |
1471 | i3c_master_detach_i3c_dev(i3cdev); | |
1472 | err_free_dev: | |
1473 | i3c_master_free_i3c_dev(i3cdev); | |
1474 | ||
1475 | return ret; | |
3a379bbc BB |
1476 | } |
1477 | ||
1478 | static void | |
1479 | i3c_master_register_new_i3c_devs(struct i3c_master_controller *master) | |
1480 | { | |
1481 | struct i3c_dev_desc *desc; | |
1482 | int ret; | |
1483 | ||
1484 | if (!master->init_done) | |
1485 | return; | |
1486 | ||
1487 | i3c_bus_for_each_i3cdev(&master->bus, desc) { | |
1488 | if (desc->dev || !desc->info.dyn_addr || desc == master->this) | |
1489 | continue; | |
1490 | ||
1491 | desc->dev = kzalloc(sizeof(*desc->dev), GFP_KERNEL); | |
1492 | if (!desc->dev) | |
1493 | continue; | |
1494 | ||
1495 | desc->dev->bus = &master->bus; | |
1496 | desc->dev->desc = desc; | |
1497 | desc->dev->dev.parent = &master->dev; | |
1498 | desc->dev->dev.type = &i3c_device_type; | |
1499 | desc->dev->dev.bus = &i3c_bus_type; | |
1500 | desc->dev->dev.release = i3c_device_release; | |
1501 | dev_set_name(&desc->dev->dev, "%d-%llx", master->bus.id, | |
1502 | desc->info.pid); | |
1503 | ||
1504 | if (desc->boardinfo) | |
1505 | desc->dev->dev.of_node = desc->boardinfo->of_node; | |
1506 | ||
1507 | ret = device_register(&desc->dev->dev); | |
1508 | if (ret) | |
1509 | dev_err(&master->dev, | |
1510 | "Failed to add I3C device (err = %d)\n", ret); | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /** | |
1515 | * i3c_master_do_daa() - do a DAA (Dynamic Address Assignment) | |
1516 | * @master: master doing the DAA | |
1517 | * | |
1518 | * This function is instantiating an I3C device object and adding it to the | |
1519 | * I3C device list. All device information are automatically retrieved using | |
1520 | * standard CCC commands. | |
1521 | * | |
1522 | * The I3C device object is returned in case the master wants to attach | |
1523 | * private data to it using i3c_dev_set_master_data(). | |
1524 | * | |
1525 | * This function must be called with the bus lock held in write mode. | |
1526 | * | |
1527 | * Return: a 0 in case of success, an negative error code otherwise. | |
1528 | */ | |
1529 | int i3c_master_do_daa(struct i3c_master_controller *master) | |
1530 | { | |
1531 | int ret; | |
1532 | ||
1533 | i3c_bus_maintenance_lock(&master->bus); | |
1534 | ret = master->ops->do_daa(master); | |
1535 | i3c_bus_maintenance_unlock(&master->bus); | |
1536 | ||
1537 | if (ret) | |
1538 | return ret; | |
1539 | ||
1540 | i3c_bus_normaluse_lock(&master->bus); | |
1541 | i3c_master_register_new_i3c_devs(master); | |
1542 | i3c_bus_normaluse_unlock(&master->bus); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(i3c_master_do_daa); | |
1547 | ||
1548 | /** | |
1549 | * i3c_master_set_info() - set master device information | |
1550 | * @master: master used to send frames on the bus | |
1551 | * @info: I3C device information | |
1552 | * | |
1553 | * Set master device info. This should be called from | |
1554 | * &i3c_master_controller_ops->bus_init(). | |
1555 | * | |
1556 | * Not all &i3c_device_info fields are meaningful for a master device. | |
1557 | * Here is a list of fields that should be properly filled: | |
1558 | * | |
1559 | * - &i3c_device_info->dyn_addr | |
1560 | * - &i3c_device_info->bcr | |
1561 | * - &i3c_device_info->dcr | |
1562 | * - &i3c_device_info->pid | |
1563 | * - &i3c_device_info->hdr_cap if %I3C_BCR_HDR_CAP bit is set in | |
1564 | * &i3c_device_info->bcr | |
1565 | * | |
1566 | * This function must be called with the bus lock held in maintenance mode. | |
1567 | * | |
1568 | * Return: 0 if @info contains valid information (not every piece of | |
1569 | * information can be checked, but we can at least make sure @info->dyn_addr | |
1570 | * and @info->bcr are correct), -EINVAL otherwise. | |
1571 | */ | |
1572 | int i3c_master_set_info(struct i3c_master_controller *master, | |
1573 | const struct i3c_device_info *info) | |
1574 | { | |
1575 | struct i3c_dev_desc *i3cdev; | |
1576 | int ret; | |
1577 | ||
1578 | if (!i3c_bus_dev_addr_is_avail(&master->bus, info->dyn_addr)) | |
1579 | return -EINVAL; | |
1580 | ||
1581 | if (I3C_BCR_DEVICE_ROLE(info->bcr) == I3C_BCR_I3C_MASTER && | |
1582 | master->secondary) | |
1583 | return -EINVAL; | |
1584 | ||
1585 | if (master->this) | |
1586 | return -EINVAL; | |
1587 | ||
1588 | i3cdev = i3c_master_alloc_i3c_dev(master, info); | |
1589 | if (IS_ERR(i3cdev)) | |
1590 | return PTR_ERR(i3cdev); | |
1591 | ||
1592 | master->this = i3cdev; | |
1593 | master->bus.cur_master = master->this; | |
1594 | ||
1595 | ret = i3c_master_attach_i3c_dev(master, i3cdev); | |
1596 | if (ret) | |
1597 | goto err_free_dev; | |
1598 | ||
1599 | return 0; | |
1600 | ||
1601 | err_free_dev: | |
1602 | i3c_master_free_i3c_dev(i3cdev); | |
1603 | ||
1604 | return ret; | |
1605 | } | |
1606 | EXPORT_SYMBOL_GPL(i3c_master_set_info); | |
1607 | ||
1608 | static void i3c_master_detach_free_devs(struct i3c_master_controller *master) | |
1609 | { | |
1610 | struct i3c_dev_desc *i3cdev, *i3ctmp; | |
1611 | struct i2c_dev_desc *i2cdev, *i2ctmp; | |
1612 | ||
1613 | list_for_each_entry_safe(i3cdev, i3ctmp, &master->bus.devs.i3c, | |
1614 | common.node) { | |
1615 | i3c_master_detach_i3c_dev(i3cdev); | |
1616 | ||
1617 | if (i3cdev->boardinfo && i3cdev->boardinfo->init_dyn_addr) | |
1618 | i3c_bus_set_addr_slot_status(&master->bus, | |
1619 | i3cdev->boardinfo->init_dyn_addr, | |
1620 | I3C_ADDR_SLOT_FREE); | |
1621 | ||
1622 | i3c_master_free_i3c_dev(i3cdev); | |
1623 | } | |
1624 | ||
1625 | list_for_each_entry_safe(i2cdev, i2ctmp, &master->bus.devs.i2c, | |
1626 | common.node) { | |
1627 | i3c_master_detach_i2c_dev(i2cdev); | |
1628 | i3c_bus_set_addr_slot_status(&master->bus, | |
b1ac3a4b PG |
1629 | i2cdev->addr, |
1630 | I3C_ADDR_SLOT_FREE); | |
3a379bbc BB |
1631 | i3c_master_free_i2c_dev(i2cdev); |
1632 | } | |
1633 | } | |
1634 | ||
1635 | /** | |
1636 | * i3c_master_bus_init() - initialize an I3C bus | |
1637 | * @master: main master initializing the bus | |
1638 | * | |
1639 | * This function is following all initialisation steps described in the I3C | |
1640 | * specification: | |
1641 | * | |
cc3a392d PT |
1642 | * 1. Attach I2C devs to the master so that the master can fill its internal |
1643 | * device table appropriately | |
3a379bbc BB |
1644 | * |
1645 | * 2. Call &i3c_master_controller_ops->bus_init() method to initialize | |
1646 | * the master controller. That's usually where the bus mode is selected | |
1647 | * (pure bus or mixed fast/slow bus) | |
1648 | * | |
1649 | * 3. Instruct all devices on the bus to drop their dynamic address. This is | |
1650 | * particularly important when the bus was previously configured by someone | |
1651 | * else (for example the bootloader) | |
1652 | * | |
1653 | * 4. Disable all slave events. | |
1654 | * | |
cc3a392d PT |
1655 | * 5. Reserve address slots for I3C devices with init_dyn_addr. And if devices |
1656 | * also have static_addr, try to pre-assign dynamic addresses requested by | |
1657 | * the FW with SETDASA and attach corresponding statically defined I3C | |
1658 | * devices to the master. | |
3a379bbc BB |
1659 | * |
1660 | * 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all | |
1661 | * remaining I3C devices | |
1662 | * | |
1663 | * Once this is done, all I3C and I2C devices should be usable. | |
1664 | * | |
1665 | * Return: a 0 in case of success, an negative error code otherwise. | |
1666 | */ | |
1667 | static int i3c_master_bus_init(struct i3c_master_controller *master) | |
1668 | { | |
1669 | enum i3c_addr_slot_status status; | |
1670 | struct i2c_dev_boardinfo *i2cboardinfo; | |
1671 | struct i3c_dev_boardinfo *i3cboardinfo; | |
3a379bbc BB |
1672 | struct i2c_dev_desc *i2cdev; |
1673 | int ret; | |
1674 | ||
1675 | /* | |
1676 | * First attach all devices with static definitions provided by the | |
1677 | * FW. | |
1678 | */ | |
1679 | list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) { | |
1680 | status = i3c_bus_get_addr_slot_status(&master->bus, | |
1681 | i2cboardinfo->base.addr); | |
1682 | if (status != I3C_ADDR_SLOT_FREE) { | |
1683 | ret = -EBUSY; | |
1684 | goto err_detach_devs; | |
1685 | } | |
1686 | ||
1687 | i3c_bus_set_addr_slot_status(&master->bus, | |
1688 | i2cboardinfo->base.addr, | |
1689 | I3C_ADDR_SLOT_I2C_DEV); | |
1690 | ||
31b9887c JI |
1691 | i2cdev = i3c_master_alloc_i2c_dev(master, |
1692 | i2cboardinfo->base.addr, | |
1693 | i2cboardinfo->lvr); | |
3a379bbc BB |
1694 | if (IS_ERR(i2cdev)) { |
1695 | ret = PTR_ERR(i2cdev); | |
1696 | goto err_detach_devs; | |
1697 | } | |
1698 | ||
1699 | ret = i3c_master_attach_i2c_dev(master, i2cdev); | |
1700 | if (ret) { | |
1701 | i3c_master_free_i2c_dev(i2cdev); | |
1702 | goto err_detach_devs; | |
1703 | } | |
1704 | } | |
3a379bbc BB |
1705 | |
1706 | /* | |
1707 | * Now execute the controller specific ->bus_init() routine, which | |
1708 | * might configure its internal logic to match the bus limitations. | |
1709 | */ | |
1710 | ret = master->ops->bus_init(master); | |
1711 | if (ret) | |
1712 | goto err_detach_devs; | |
1713 | ||
1714 | /* | |
1715 | * The master device should have been instantiated in ->bus_init(), | |
1716 | * complain if this was not the case. | |
1717 | */ | |
1718 | if (!master->this) { | |
1719 | dev_err(&master->dev, | |
1720 | "master_set_info() was not called in ->bus_init()\n"); | |
1721 | ret = -EINVAL; | |
1722 | goto err_bus_cleanup; | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * Reset all dynamic address that may have been assigned before | |
1727 | * (assigned by the bootloader for example). | |
1728 | */ | |
1729 | ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); | |
1730 | if (ret && ret != I3C_ERROR_M2) | |
1731 | goto err_bus_cleanup; | |
1732 | ||
1733 | /* Disable all slave events before starting DAA. */ | |
1734 | ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR, | |
1735 | I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR | | |
1736 | I3C_CCC_EVENT_HJ); | |
1737 | if (ret && ret != I3C_ERROR_M2) | |
1738 | goto err_bus_cleanup; | |
1739 | ||
1740 | /* | |
cc3a392d PT |
1741 | * Reserve init_dyn_addr first, and then try to pre-assign dynamic |
1742 | * address and retrieve device information if needed. | |
1743 | * In case pre-assign dynamic address fails, setting dynamic address to | |
1744 | * the requested init_dyn_addr is retried after DAA is done in | |
1745 | * i3c_master_add_i3c_dev_locked(). | |
3a379bbc | 1746 | */ |
cc3a392d PT |
1747 | list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) { |
1748 | ||
1749 | /* | |
1750 | * We don't reserve a dynamic address for devices that | |
1751 | * don't explicitly request one. | |
1752 | */ | |
1753 | if (!i3cboardinfo->init_dyn_addr) | |
1754 | continue; | |
1755 | ||
1756 | ret = i3c_bus_get_addr_slot_status(&master->bus, | |
1757 | i3cboardinfo->init_dyn_addr); | |
1758 | if (ret != I3C_ADDR_SLOT_FREE) { | |
1759 | ret = -EBUSY; | |
1760 | goto err_rstdaa; | |
1761 | } | |
1762 | ||
1763 | i3c_bus_set_addr_slot_status(&master->bus, | |
1764 | i3cboardinfo->init_dyn_addr, | |
1765 | I3C_ADDR_SLOT_I3C_DEV); | |
1766 | ||
1767 | /* | |
1768 | * Only try to create/attach devices that have a static | |
1769 | * address. Other devices will be created/attached when | |
1770 | * DAA happens, and the requested dynamic address will | |
1771 | * be set using SETNEWDA once those devices become | |
1772 | * addressable. | |
1773 | */ | |
1774 | ||
1775 | if (i3cboardinfo->static_addr) | |
1776 | i3c_master_early_i3c_dev_add(master, i3cboardinfo); | |
1777 | } | |
3a379bbc BB |
1778 | |
1779 | ret = i3c_master_do_daa(master); | |
1780 | if (ret) | |
1781 | goto err_rstdaa; | |
1782 | ||
1783 | return 0; | |
1784 | ||
1785 | err_rstdaa: | |
1786 | i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); | |
1787 | ||
1788 | err_bus_cleanup: | |
1789 | if (master->ops->bus_cleanup) | |
1790 | master->ops->bus_cleanup(master); | |
1791 | ||
1792 | err_detach_devs: | |
1793 | i3c_master_detach_free_devs(master); | |
1794 | ||
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | static void i3c_master_bus_cleanup(struct i3c_master_controller *master) | |
1799 | { | |
1800 | if (master->ops->bus_cleanup) | |
1801 | master->ops->bus_cleanup(master); | |
1802 | ||
1803 | i3c_master_detach_free_devs(master); | |
1804 | } | |
1805 | ||
9da36a7e PT |
1806 | static void i3c_master_attach_boardinfo(struct i3c_dev_desc *i3cdev) |
1807 | { | |
1808 | struct i3c_master_controller *master = i3cdev->common.master; | |
1809 | struct i3c_dev_boardinfo *i3cboardinfo; | |
1810 | ||
1811 | list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) { | |
1812 | if (i3cdev->info.pid != i3cboardinfo->pid) | |
1813 | continue; | |
1814 | ||
1815 | i3cdev->boardinfo = i3cboardinfo; | |
1816 | i3cdev->info.static_addr = i3cboardinfo->static_addr; | |
1817 | return; | |
1818 | } | |
1819 | } | |
1820 | ||
3a379bbc BB |
1821 | static struct i3c_dev_desc * |
1822 | i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev) | |
1823 | { | |
f12b524e | 1824 | struct i3c_master_controller *master = i3c_dev_get_master(refdev); |
3a379bbc BB |
1825 | struct i3c_dev_desc *i3cdev; |
1826 | ||
1827 | i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { | |
1828 | if (i3cdev != refdev && i3cdev->info.pid == refdev->info.pid) | |
1829 | return i3cdev; | |
1830 | } | |
1831 | ||
1832 | return NULL; | |
1833 | } | |
1834 | ||
1835 | /** | |
1836 | * i3c_master_add_i3c_dev_locked() - add an I3C slave to the bus | |
1837 | * @master: master used to send frames on the bus | |
1838 | * @addr: I3C slave dynamic address assigned to the device | |
1839 | * | |
1840 | * This function is instantiating an I3C device object and adding it to the | |
1841 | * I3C device list. All device information are automatically retrieved using | |
1842 | * standard CCC commands. | |
1843 | * | |
1844 | * The I3C device object is returned in case the master wants to attach | |
1845 | * private data to it using i3c_dev_set_master_data(). | |
1846 | * | |
1847 | * This function must be called with the bus lock held in write mode. | |
1848 | * | |
1849 | * Return: a 0 in case of success, an negative error code otherwise. | |
1850 | */ | |
1851 | int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master, | |
1852 | u8 addr) | |
1853 | { | |
1854 | struct i3c_device_info info = { .dyn_addr = addr }; | |
1855 | struct i3c_dev_desc *newdev, *olddev; | |
1856 | u8 old_dyn_addr = addr, expected_dyn_addr; | |
1857 | struct i3c_ibi_setup ibireq = { }; | |
1858 | bool enable_ibi = false; | |
1859 | int ret; | |
1860 | ||
1861 | if (!master) | |
1862 | return -EINVAL; | |
1863 | ||
1864 | newdev = i3c_master_alloc_i3c_dev(master, &info); | |
1865 | if (IS_ERR(newdev)) | |
1866 | return PTR_ERR(newdev); | |
1867 | ||
1868 | ret = i3c_master_attach_i3c_dev(master, newdev); | |
840414ae | 1869 | if (ret) |
3a379bbc | 1870 | goto err_free_dev; |
3a379bbc BB |
1871 | |
1872 | ret = i3c_master_retrieve_dev_info(newdev); | |
1873 | if (ret) | |
093c61b6 | 1874 | goto err_detach_dev; |
3a379bbc | 1875 | |
9da36a7e PT |
1876 | i3c_master_attach_boardinfo(newdev); |
1877 | ||
3a379bbc BB |
1878 | olddev = i3c_master_search_i3c_dev_duplicate(newdev); |
1879 | if (olddev) { | |
3a379bbc BB |
1880 | newdev->dev = olddev->dev; |
1881 | if (newdev->dev) | |
1882 | newdev->dev->desc = newdev; | |
1883 | ||
1884 | /* | |
1885 | * We need to restore the IBI state too, so let's save the | |
1886 | * IBI information and try to restore them after olddev has | |
1887 | * been detached+released and its IBI has been stopped and | |
1888 | * the associated resources have been freed. | |
1889 | */ | |
1890 | mutex_lock(&olddev->ibi_lock); | |
1891 | if (olddev->ibi) { | |
1892 | ibireq.handler = olddev->ibi->handler; | |
1893 | ibireq.max_payload_len = olddev->ibi->max_payload_len; | |
1894 | ibireq.num_slots = olddev->ibi->num_slots; | |
1895 | ||
1896 | if (olddev->ibi->enabled) { | |
1897 | enable_ibi = true; | |
1898 | i3c_dev_disable_ibi_locked(olddev); | |
1899 | } | |
1900 | ||
1901 | i3c_dev_free_ibi_locked(olddev); | |
1902 | } | |
1903 | mutex_unlock(&olddev->ibi_lock); | |
1904 | ||
1905 | old_dyn_addr = olddev->info.dyn_addr; | |
1906 | ||
1907 | i3c_master_detach_i3c_dev(olddev); | |
1908 | i3c_master_free_i3c_dev(olddev); | |
1909 | } | |
1910 | ||
1911 | ret = i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); | |
1912 | if (ret) | |
1913 | goto err_detach_dev; | |
1914 | ||
1915 | /* | |
1916 | * Depending on our previous state, the expected dynamic address might | |
1917 | * differ: | |
1918 | * - if the device already had a dynamic address assigned, let's try to | |
1919 | * re-apply this one | |
1920 | * - if the device did not have a dynamic address and the firmware | |
1921 | * requested a specific address, pick this one | |
1922 | * - in any other case, keep the address automatically assigned by the | |
1923 | * master | |
1924 | */ | |
1925 | if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr) | |
1926 | expected_dyn_addr = old_dyn_addr; | |
1927 | else if (newdev->boardinfo && newdev->boardinfo->init_dyn_addr) | |
1928 | expected_dyn_addr = newdev->boardinfo->init_dyn_addr; | |
1929 | else | |
1930 | expected_dyn_addr = newdev->info.dyn_addr; | |
1931 | ||
1932 | if (newdev->info.dyn_addr != expected_dyn_addr) { | |
1933 | /* | |
1934 | * Try to apply the expected dynamic address. If it fails, keep | |
1935 | * the address assigned by the master. | |
1936 | */ | |
1937 | ret = i3c_master_setnewda_locked(master, | |
1938 | newdev->info.dyn_addr, | |
1939 | expected_dyn_addr); | |
1940 | if (!ret) { | |
1941 | old_dyn_addr = newdev->info.dyn_addr; | |
1942 | newdev->info.dyn_addr = expected_dyn_addr; | |
1943 | i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); | |
1944 | } else { | |
1945 | dev_err(&master->dev, | |
1946 | "Failed to assign reserved/old address to device %d%llx", | |
1947 | master->bus.id, newdev->info.pid); | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * Now is time to try to restore the IBI setup. If we're lucky, | |
1953 | * everything works as before, otherwise, all we can do is complain. | |
1954 | * FIXME: maybe we should add callback to inform the driver that it | |
1955 | * should request the IBI again instead of trying to hide that from | |
1956 | * him. | |
1957 | */ | |
1958 | if (ibireq.handler) { | |
1959 | mutex_lock(&newdev->ibi_lock); | |
1960 | ret = i3c_dev_request_ibi_locked(newdev, &ibireq); | |
1961 | if (ret) { | |
1962 | dev_err(&master->dev, | |
1963 | "Failed to request IBI on device %d-%llx", | |
1964 | master->bus.id, newdev->info.pid); | |
1965 | } else if (enable_ibi) { | |
1966 | ret = i3c_dev_enable_ibi_locked(newdev); | |
1967 | if (ret) | |
1968 | dev_err(&master->dev, | |
1969 | "Failed to re-enable IBI on device %d-%llx", | |
1970 | master->bus.id, newdev->info.pid); | |
1971 | } | |
1972 | mutex_unlock(&newdev->ibi_lock); | |
1973 | } | |
1974 | ||
1975 | return 0; | |
1976 | ||
1977 | err_detach_dev: | |
1978 | if (newdev->dev && newdev->dev->desc) | |
1979 | newdev->dev->desc = NULL; | |
1980 | ||
1981 | i3c_master_detach_i3c_dev(newdev); | |
1982 | ||
1983 | err_free_dev: | |
1984 | i3c_master_free_i3c_dev(newdev); | |
1985 | ||
1986 | return ret; | |
1987 | } | |
1988 | EXPORT_SYMBOL_GPL(i3c_master_add_i3c_dev_locked); | |
1989 | ||
1990 | #define OF_I3C_REG1_IS_I2C_DEV BIT(31) | |
1991 | ||
1992 | static int | |
1993 | of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master, | |
1994 | struct device_node *node, u32 *reg) | |
1995 | { | |
1996 | struct i2c_dev_boardinfo *boardinfo; | |
1997 | struct device *dev = &master->dev; | |
1998 | int ret; | |
1999 | ||
2000 | boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); | |
2001 | if (!boardinfo) | |
2002 | return -ENOMEM; | |
2003 | ||
2004 | ret = of_i2c_get_board_info(dev, node, &boardinfo->base); | |
2005 | if (ret) | |
2006 | return ret; | |
2007 | ||
88c50322 PG |
2008 | /* |
2009 | * The I3C Specification does not clearly say I2C devices with 10-bit | |
2010 | * address are supported. These devices can't be passed properly through | |
2011 | * DEFSLVS command. | |
2012 | */ | |
2013 | if (boardinfo->base.flags & I2C_CLIENT_TEN) { | |
de896499 | 2014 | dev_err(dev, "I2C device with 10 bit address not supported."); |
88c50322 PG |
2015 | return -ENOTSUPP; |
2016 | } | |
2017 | ||
3a379bbc BB |
2018 | /* LVR is encoded in reg[2]. */ |
2019 | boardinfo->lvr = reg[2]; | |
2020 | ||
3a379bbc BB |
2021 | list_add_tail(&boardinfo->node, &master->boardinfo.i2c); |
2022 | of_node_get(node); | |
2023 | ||
2024 | return 0; | |
2025 | } | |
2026 | ||
2027 | static int | |
2028 | of_i3c_master_add_i3c_boardinfo(struct i3c_master_controller *master, | |
2029 | struct device_node *node, u32 *reg) | |
2030 | { | |
2031 | struct i3c_dev_boardinfo *boardinfo; | |
2032 | struct device *dev = &master->dev; | |
3a379bbc BB |
2033 | enum i3c_addr_slot_status addrstatus; |
2034 | u32 init_dyn_addr = 0; | |
2035 | ||
2036 | boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); | |
2037 | if (!boardinfo) | |
2038 | return -ENOMEM; | |
2039 | ||
2040 | if (reg[0]) { | |
2041 | if (reg[0] > I3C_MAX_ADDR) | |
2042 | return -EINVAL; | |
2043 | ||
2044 | addrstatus = i3c_bus_get_addr_slot_status(&master->bus, | |
2045 | reg[0]); | |
2046 | if (addrstatus != I3C_ADDR_SLOT_FREE) | |
2047 | return -EINVAL; | |
2048 | } | |
2049 | ||
2050 | boardinfo->static_addr = reg[0]; | |
2051 | ||
2052 | if (!of_property_read_u32(node, "assigned-address", &init_dyn_addr)) { | |
2053 | if (init_dyn_addr > I3C_MAX_ADDR) | |
2054 | return -EINVAL; | |
2055 | ||
2056 | addrstatus = i3c_bus_get_addr_slot_status(&master->bus, | |
2057 | init_dyn_addr); | |
2058 | if (addrstatus != I3C_ADDR_SLOT_FREE) | |
2059 | return -EINVAL; | |
2060 | } | |
2061 | ||
2062 | boardinfo->pid = ((u64)reg[1] << 32) | reg[2]; | |
2063 | ||
9752c37c VS |
2064 | if ((boardinfo->pid & GENMASK_ULL(63, 48)) || |
2065 | I3C_PID_RND_LOWER_32BITS(boardinfo->pid)) | |
3a379bbc BB |
2066 | return -EINVAL; |
2067 | ||
2068 | boardinfo->init_dyn_addr = init_dyn_addr; | |
2069 | boardinfo->of_node = of_node_get(node); | |
2070 | list_add_tail(&boardinfo->node, &master->boardinfo.i3c); | |
2071 | ||
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | static int of_i3c_master_add_dev(struct i3c_master_controller *master, | |
2076 | struct device_node *node) | |
2077 | { | |
2078 | u32 reg[3]; | |
2079 | int ret; | |
2080 | ||
2081 | if (!master || !node) | |
2082 | return -EINVAL; | |
2083 | ||
2084 | ret = of_property_read_u32_array(node, "reg", reg, ARRAY_SIZE(reg)); | |
2085 | if (ret) | |
2086 | return ret; | |
2087 | ||
2088 | /* | |
2089 | * The manufacturer ID can't be 0. If reg[1] == 0 that means we're | |
2090 | * dealing with an I2C device. | |
2091 | */ | |
2092 | if (!reg[1]) | |
2093 | ret = of_i3c_master_add_i2c_boardinfo(master, node, reg); | |
2094 | else | |
2095 | ret = of_i3c_master_add_i3c_boardinfo(master, node, reg); | |
2096 | ||
2097 | return ret; | |
2098 | } | |
2099 | ||
2100 | static int of_populate_i3c_bus(struct i3c_master_controller *master) | |
2101 | { | |
2102 | struct device *dev = &master->dev; | |
2103 | struct device_node *i3cbus_np = dev->of_node; | |
2104 | struct device_node *node; | |
2105 | int ret; | |
2106 | u32 val; | |
2107 | ||
2108 | if (!i3cbus_np) | |
2109 | return 0; | |
2110 | ||
2111 | for_each_available_child_of_node(i3cbus_np, node) { | |
2112 | ret = of_i3c_master_add_dev(master, node); | |
91227632 ND |
2113 | if (ret) { |
2114 | of_node_put(node); | |
3a379bbc | 2115 | return ret; |
91227632 | 2116 | } |
3a379bbc BB |
2117 | } |
2118 | ||
2119 | /* | |
2120 | * The user might want to limit I2C and I3C speed in case some devices | |
2121 | * on the bus are not supporting typical rates, or if the bus topology | |
2122 | * prevents it from using max possible rate. | |
2123 | */ | |
2124 | if (!of_property_read_u32(i3cbus_np, "i2c-scl-hz", &val)) | |
2125 | master->bus.scl_rate.i2c = val; | |
2126 | ||
2127 | if (!of_property_read_u32(i3cbus_np, "i3c-scl-hz", &val)) | |
2128 | master->bus.scl_rate.i3c = val; | |
2129 | ||
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | static int i3c_master_i2c_adapter_xfer(struct i2c_adapter *adap, | |
2134 | struct i2c_msg *xfers, int nxfers) | |
2135 | { | |
2136 | struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); | |
2137 | struct i2c_dev_desc *dev; | |
2138 | int i, ret; | |
2139 | u16 addr; | |
2140 | ||
2141 | if (!xfers || !master || nxfers <= 0) | |
2142 | return -EINVAL; | |
2143 | ||
2144 | if (!master->ops->i2c_xfers) | |
2145 | return -ENOTSUPP; | |
2146 | ||
2147 | /* Doing transfers to different devices is not supported. */ | |
2148 | addr = xfers[0].addr; | |
2149 | for (i = 1; i < nxfers; i++) { | |
2150 | if (addr != xfers[i].addr) | |
2151 | return -ENOTSUPP; | |
2152 | } | |
2153 | ||
2154 | i3c_bus_normaluse_lock(&master->bus); | |
2155 | dev = i3c_master_find_i2c_dev_by_addr(master, addr); | |
2156 | if (!dev) | |
2157 | ret = -ENOENT; | |
2158 | else | |
2159 | ret = master->ops->i2c_xfers(dev, xfers, nxfers); | |
2160 | i3c_bus_normaluse_unlock(&master->bus); | |
2161 | ||
2162 | return ret ? ret : nxfers; | |
2163 | } | |
2164 | ||
88c50322 | 2165 | static u32 i3c_master_i2c_funcs(struct i2c_adapter *adapter) |
3a379bbc | 2166 | { |
88c50322 | 2167 | return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; |
3a379bbc BB |
2168 | } |
2169 | ||
72a4501b JI |
2170 | static u8 i3c_master_i2c_get_lvr(struct i2c_client *client) |
2171 | { | |
2172 | /* Fall back to no spike filters and FM bus mode. */ | |
2173 | u8 lvr = I3C_LVR_I2C_INDEX(2) | I3C_LVR_I2C_FM_MODE; | |
2174 | ||
2175 | if (client->dev.of_node) { | |
2176 | u32 reg[3]; | |
2177 | ||
2178 | if (!of_property_read_u32_array(client->dev.of_node, "reg", | |
2179 | reg, ARRAY_SIZE(reg))) | |
2180 | lvr = reg[2]; | |
2181 | } | |
2182 | ||
2183 | return lvr; | |
2184 | } | |
2185 | ||
2186 | static int i3c_master_i2c_attach(struct i2c_adapter *adap, struct i2c_client *client) | |
2187 | { | |
2188 | struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); | |
2189 | enum i3c_addr_slot_status status; | |
2190 | struct i2c_dev_desc *i2cdev; | |
2191 | int ret; | |
2192 | ||
2193 | /* Already added by board info? */ | |
2194 | if (i3c_master_find_i2c_dev_by_addr(master, client->addr)) | |
2195 | return 0; | |
2196 | ||
2197 | status = i3c_bus_get_addr_slot_status(&master->bus, client->addr); | |
2198 | if (status != I3C_ADDR_SLOT_FREE) | |
2199 | return -EBUSY; | |
2200 | ||
2201 | i3c_bus_set_addr_slot_status(&master->bus, client->addr, | |
2202 | I3C_ADDR_SLOT_I2C_DEV); | |
2203 | ||
2204 | i2cdev = i3c_master_alloc_i2c_dev(master, client->addr, | |
2205 | i3c_master_i2c_get_lvr(client)); | |
2206 | if (IS_ERR(i2cdev)) { | |
2207 | ret = PTR_ERR(i2cdev); | |
2208 | goto out_clear_status; | |
2209 | } | |
2210 | ||
2211 | ret = i3c_master_attach_i2c_dev(master, i2cdev); | |
2212 | if (ret) | |
2213 | goto out_free_dev; | |
2214 | ||
2215 | return 0; | |
2216 | ||
2217 | out_free_dev: | |
2218 | i3c_master_free_i2c_dev(i2cdev); | |
2219 | out_clear_status: | |
2220 | i3c_bus_set_addr_slot_status(&master->bus, client->addr, | |
2221 | I3C_ADDR_SLOT_FREE); | |
2222 | ||
2223 | return ret; | |
2224 | } | |
2225 | ||
2226 | static int i3c_master_i2c_detach(struct i2c_adapter *adap, struct i2c_client *client) | |
2227 | { | |
2228 | struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); | |
2229 | struct i2c_dev_desc *dev; | |
2230 | ||
2231 | dev = i3c_master_find_i2c_dev_by_addr(master, client->addr); | |
2232 | if (!dev) | |
2233 | return -ENODEV; | |
2234 | ||
2235 | i3c_master_detach_i2c_dev(dev); | |
2236 | i3c_bus_set_addr_slot_status(&master->bus, dev->addr, | |
2237 | I3C_ADDR_SLOT_FREE); | |
2238 | i3c_master_free_i2c_dev(dev); | |
2239 | ||
2240 | return 0; | |
2241 | } | |
2242 | ||
3a379bbc BB |
2243 | static const struct i2c_algorithm i3c_master_i2c_algo = { |
2244 | .master_xfer = i3c_master_i2c_adapter_xfer, | |
88c50322 | 2245 | .functionality = i3c_master_i2c_funcs, |
3a379bbc BB |
2246 | }; |
2247 | ||
72a4501b JI |
2248 | static int i3c_i2c_notifier_call(struct notifier_block *nb, unsigned long action, |
2249 | void *data) | |
2250 | { | |
2251 | struct i2c_adapter *adap; | |
2252 | struct i2c_client *client; | |
2253 | struct device *dev = data; | |
2254 | struct i3c_master_controller *master; | |
2255 | int ret; | |
2256 | ||
2257 | if (dev->type != &i2c_client_type) | |
2258 | return 0; | |
2259 | ||
2260 | client = to_i2c_client(dev); | |
2261 | adap = client->adapter; | |
2262 | ||
2263 | if (adap->algo != &i3c_master_i2c_algo) | |
2264 | return 0; | |
2265 | ||
2266 | master = i2c_adapter_to_i3c_master(adap); | |
2267 | ||
2268 | i3c_bus_maintenance_lock(&master->bus); | |
2269 | switch (action) { | |
2270 | case BUS_NOTIFY_ADD_DEVICE: | |
2271 | ret = i3c_master_i2c_attach(adap, client); | |
2272 | break; | |
2273 | case BUS_NOTIFY_DEL_DEVICE: | |
2274 | ret = i3c_master_i2c_detach(adap, client); | |
2275 | break; | |
2276 | } | |
2277 | i3c_bus_maintenance_unlock(&master->bus); | |
2278 | ||
2279 | return ret; | |
2280 | } | |
2281 | ||
2282 | static struct notifier_block i2cdev_notifier = { | |
2283 | .notifier_call = i3c_i2c_notifier_call, | |
2284 | }; | |
2285 | ||
3a379bbc BB |
2286 | static int i3c_master_i2c_adapter_init(struct i3c_master_controller *master) |
2287 | { | |
2288 | struct i2c_adapter *adap = i3c_master_to_i2c_adapter(master); | |
2289 | struct i2c_dev_desc *i2cdev; | |
31b9887c | 2290 | struct i2c_dev_boardinfo *i2cboardinfo; |
3a379bbc BB |
2291 | int ret; |
2292 | ||
2293 | adap->dev.parent = master->dev.parent; | |
2294 | adap->owner = master->dev.parent->driver->owner; | |
2295 | adap->algo = &i3c_master_i2c_algo; | |
2296 | strncpy(adap->name, dev_name(master->dev.parent), sizeof(adap->name)); | |
2297 | ||
2298 | /* FIXME: Should we allow i3c masters to override these values? */ | |
2299 | adap->timeout = 1000; | |
2300 | adap->retries = 3; | |
2301 | ||
2302 | ret = i2c_add_adapter(adap); | |
2303 | if (ret) | |
2304 | return ret; | |
2305 | ||
2306 | /* | |
2307 | * We silently ignore failures here. The bus should keep working | |
2308 | * correctly even if one or more i2c devices are not registered. | |
2309 | */ | |
6cbf8b38 JI |
2310 | list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) { |
2311 | i2cdev = i3c_master_find_i2c_dev_by_addr(master, | |
2312 | i2cboardinfo->base.addr); | |
2313 | if (WARN_ON(!i2cdev)) | |
2314 | continue; | |
31b9887c | 2315 | i2cdev->dev = i2c_new_client_device(adap, &i2cboardinfo->base); |
6cbf8b38 | 2316 | } |
3a379bbc BB |
2317 | |
2318 | return 0; | |
2319 | } | |
2320 | ||
2321 | static void i3c_master_i2c_adapter_cleanup(struct i3c_master_controller *master) | |
2322 | { | |
2323 | struct i2c_dev_desc *i2cdev; | |
2324 | ||
2325 | i2c_del_adapter(&master->i2c); | |
2326 | ||
2327 | i3c_bus_for_each_i2cdev(&master->bus, i2cdev) | |
2328 | i2cdev->dev = NULL; | |
2329 | } | |
2330 | ||
2331 | static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master) | |
2332 | { | |
2333 | struct i3c_dev_desc *i3cdev; | |
2334 | ||
2335 | i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { | |
2336 | if (!i3cdev->dev) | |
2337 | continue; | |
2338 | ||
2339 | i3cdev->dev->desc = NULL; | |
2340 | if (device_is_registered(&i3cdev->dev->dev)) | |
2341 | device_unregister(&i3cdev->dev->dev); | |
2342 | else | |
2343 | put_device(&i3cdev->dev->dev); | |
2344 | i3cdev->dev = NULL; | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | /** | |
2349 | * i3c_master_queue_ibi() - Queue an IBI | |
2350 | * @dev: the device this IBI is coming from | |
2351 | * @slot: the IBI slot used to store the payload | |
2352 | * | |
2353 | * Queue an IBI to the controller workqueue. The IBI handler attached to | |
2354 | * the dev will be called from a workqueue context. | |
2355 | */ | |
2356 | void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) | |
2357 | { | |
2358 | atomic_inc(&dev->ibi->pending_ibis); | |
2359 | queue_work(dev->common.master->wq, &slot->work); | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(i3c_master_queue_ibi); | |
2362 | ||
2363 | static void i3c_master_handle_ibi(struct work_struct *work) | |
2364 | { | |
2365 | struct i3c_ibi_slot *slot = container_of(work, struct i3c_ibi_slot, | |
2366 | work); | |
2367 | struct i3c_dev_desc *dev = slot->dev; | |
2368 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
2369 | struct i3c_ibi_payload payload; | |
2370 | ||
2371 | payload.data = slot->data; | |
2372 | payload.len = slot->len; | |
2373 | ||
2374 | if (dev->dev) | |
2375 | dev->ibi->handler(dev->dev, &payload); | |
2376 | ||
2377 | master->ops->recycle_ibi_slot(dev, slot); | |
2378 | if (atomic_dec_and_test(&dev->ibi->pending_ibis)) | |
2379 | complete(&dev->ibi->all_ibis_handled); | |
2380 | } | |
2381 | ||
2382 | static void i3c_master_init_ibi_slot(struct i3c_dev_desc *dev, | |
2383 | struct i3c_ibi_slot *slot) | |
2384 | { | |
2385 | slot->dev = dev; | |
2386 | INIT_WORK(&slot->work, i3c_master_handle_ibi); | |
2387 | } | |
2388 | ||
2389 | struct i3c_generic_ibi_slot { | |
2390 | struct list_head node; | |
2391 | struct i3c_ibi_slot base; | |
2392 | }; | |
2393 | ||
2394 | struct i3c_generic_ibi_pool { | |
2395 | spinlock_t lock; | |
2396 | unsigned int num_slots; | |
2397 | struct i3c_generic_ibi_slot *slots; | |
2398 | void *payload_buf; | |
2399 | struct list_head free_slots; | |
2400 | struct list_head pending; | |
2401 | }; | |
2402 | ||
2403 | /** | |
2404 | * i3c_generic_ibi_free_pool() - Free a generic IBI pool | |
2405 | * @pool: the IBI pool to free | |
2406 | * | |
2407 | * Free all IBI slots allated by a generic IBI pool. | |
2408 | */ | |
2409 | void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool) | |
2410 | { | |
2411 | struct i3c_generic_ibi_slot *slot; | |
2412 | unsigned int nslots = 0; | |
2413 | ||
2414 | while (!list_empty(&pool->free_slots)) { | |
2415 | slot = list_first_entry(&pool->free_slots, | |
2416 | struct i3c_generic_ibi_slot, node); | |
2417 | list_del(&slot->node); | |
2418 | nslots++; | |
2419 | } | |
2420 | ||
2421 | /* | |
2422 | * If the number of freed slots is not equal to the number of allocated | |
2423 | * slots we have a leak somewhere. | |
2424 | */ | |
2425 | WARN_ON(nslots != pool->num_slots); | |
2426 | ||
2427 | kfree(pool->payload_buf); | |
2428 | kfree(pool->slots); | |
2429 | kfree(pool); | |
2430 | } | |
2431 | EXPORT_SYMBOL_GPL(i3c_generic_ibi_free_pool); | |
2432 | ||
2433 | /** | |
2434 | * i3c_generic_ibi_alloc_pool() - Create a generic IBI pool | |
2435 | * @dev: the device this pool will be used for | |
2436 | * @req: IBI setup request describing what the device driver expects | |
2437 | * | |
2438 | * Create a generic IBI pool based on the information provided in @req. | |
2439 | * | |
2440 | * Return: a valid IBI pool in case of success, an ERR_PTR() otherwise. | |
2441 | */ | |
2442 | struct i3c_generic_ibi_pool * | |
2443 | i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev, | |
2444 | const struct i3c_ibi_setup *req) | |
2445 | { | |
2446 | struct i3c_generic_ibi_pool *pool; | |
2447 | struct i3c_generic_ibi_slot *slot; | |
2448 | unsigned int i; | |
2449 | int ret; | |
2450 | ||
2451 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
2452 | if (!pool) | |
2453 | return ERR_PTR(-ENOMEM); | |
2454 | ||
2455 | spin_lock_init(&pool->lock); | |
2456 | INIT_LIST_HEAD(&pool->free_slots); | |
2457 | INIT_LIST_HEAD(&pool->pending); | |
2458 | ||
2459 | pool->slots = kcalloc(req->num_slots, sizeof(*slot), GFP_KERNEL); | |
2460 | if (!pool->slots) { | |
2461 | ret = -ENOMEM; | |
2462 | goto err_free_pool; | |
2463 | } | |
2464 | ||
2465 | if (req->max_payload_len) { | |
2466 | pool->payload_buf = kcalloc(req->num_slots, | |
2467 | req->max_payload_len, GFP_KERNEL); | |
2468 | if (!pool->payload_buf) { | |
2469 | ret = -ENOMEM; | |
2470 | goto err_free_pool; | |
2471 | } | |
2472 | } | |
2473 | ||
2474 | for (i = 0; i < req->num_slots; i++) { | |
2475 | slot = &pool->slots[i]; | |
2476 | i3c_master_init_ibi_slot(dev, &slot->base); | |
2477 | ||
2478 | if (req->max_payload_len) | |
2479 | slot->base.data = pool->payload_buf + | |
2480 | (i * req->max_payload_len); | |
2481 | ||
2482 | list_add_tail(&slot->node, &pool->free_slots); | |
2483 | pool->num_slots++; | |
2484 | } | |
2485 | ||
2486 | return pool; | |
2487 | ||
2488 | err_free_pool: | |
2489 | i3c_generic_ibi_free_pool(pool); | |
2490 | return ERR_PTR(ret); | |
2491 | } | |
2492 | EXPORT_SYMBOL_GPL(i3c_generic_ibi_alloc_pool); | |
2493 | ||
2494 | /** | |
2495 | * i3c_generic_ibi_get_free_slot() - Get a free slot from a generic IBI pool | |
2496 | * @pool: the pool to query an IBI slot on | |
2497 | * | |
2498 | * Search for a free slot in a generic IBI pool. | |
2499 | * The slot should be returned to the pool using i3c_generic_ibi_recycle_slot() | |
2500 | * when it's no longer needed. | |
2501 | * | |
2502 | * Return: a pointer to a free slot, or NULL if there's no free slot available. | |
2503 | */ | |
2504 | struct i3c_ibi_slot * | |
2505 | i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool) | |
2506 | { | |
2507 | struct i3c_generic_ibi_slot *slot; | |
2508 | unsigned long flags; | |
2509 | ||
2510 | spin_lock_irqsave(&pool->lock, flags); | |
2511 | slot = list_first_entry_or_null(&pool->free_slots, | |
2512 | struct i3c_generic_ibi_slot, node); | |
2513 | if (slot) | |
2514 | list_del(&slot->node); | |
2515 | spin_unlock_irqrestore(&pool->lock, flags); | |
2516 | ||
2517 | return slot ? &slot->base : NULL; | |
2518 | } | |
2519 | EXPORT_SYMBOL_GPL(i3c_generic_ibi_get_free_slot); | |
2520 | ||
2521 | /** | |
2522 | * i3c_generic_ibi_recycle_slot() - Return a slot to a generic IBI pool | |
2523 | * @pool: the pool to return the IBI slot to | |
2524 | * @s: IBI slot to recycle | |
2525 | * | |
2526 | * Add an IBI slot back to its generic IBI pool. Should be called from the | |
2527 | * master driver struct_master_controller_ops->recycle_ibi() method. | |
2528 | */ | |
2529 | void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool, | |
2530 | struct i3c_ibi_slot *s) | |
2531 | { | |
2532 | struct i3c_generic_ibi_slot *slot; | |
2533 | unsigned long flags; | |
2534 | ||
2535 | if (!s) | |
2536 | return; | |
2537 | ||
2538 | slot = container_of(s, struct i3c_generic_ibi_slot, base); | |
2539 | spin_lock_irqsave(&pool->lock, flags); | |
2540 | list_add_tail(&slot->node, &pool->free_slots); | |
2541 | spin_unlock_irqrestore(&pool->lock, flags); | |
2542 | } | |
2543 | EXPORT_SYMBOL_GPL(i3c_generic_ibi_recycle_slot); | |
2544 | ||
2545 | static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops) | |
2546 | { | |
2547 | if (!ops || !ops->bus_init || !ops->priv_xfers || | |
88c50322 | 2548 | !ops->send_ccc_cmd || !ops->do_daa || !ops->i2c_xfers) |
3a379bbc BB |
2549 | return -EINVAL; |
2550 | ||
2551 | if (ops->request_ibi && | |
2552 | (!ops->enable_ibi || !ops->disable_ibi || !ops->free_ibi || | |
2553 | !ops->recycle_ibi_slot)) | |
2554 | return -EINVAL; | |
2555 | ||
2556 | return 0; | |
2557 | } | |
2558 | ||
2559 | /** | |
2560 | * i3c_master_register() - register an I3C master | |
2561 | * @master: master used to send frames on the bus | |
2562 | * @parent: the parent device (the one that provides this I3C master | |
2563 | * controller) | |
2564 | * @ops: the master controller operations | |
2565 | * @secondary: true if you are registering a secondary master. Will return | |
2566 | * -ENOTSUPP if set to true since secondary masters are not yet | |
2567 | * supported | |
2568 | * | |
2569 | * This function takes care of everything for you: | |
2570 | * | |
2571 | * - creates and initializes the I3C bus | |
2572 | * - populates the bus with static I2C devs if @parent->of_node is not | |
2573 | * NULL | |
2574 | * - registers all I3C devices added by the controller during bus | |
2575 | * initialization | |
2576 | * - registers the I2C adapter and all I2C devices | |
2577 | * | |
2578 | * Return: 0 in case of success, a negative error code otherwise. | |
2579 | */ | |
2580 | int i3c_master_register(struct i3c_master_controller *master, | |
2581 | struct device *parent, | |
2582 | const struct i3c_master_controller_ops *ops, | |
2583 | bool secondary) | |
2584 | { | |
ecc8fb54 | 2585 | unsigned long i2c_scl_rate = I3C_BUS_I2C_FM_PLUS_SCL_RATE; |
3a379bbc BB |
2586 | struct i3c_bus *i3cbus = i3c_master_get_bus(master); |
2587 | enum i3c_bus_mode mode = I3C_BUS_MODE_PURE; | |
2588 | struct i2c_dev_boardinfo *i2cbi; | |
2589 | int ret; | |
2590 | ||
2591 | /* We do not support secondary masters yet. */ | |
2592 | if (secondary) | |
2593 | return -ENOTSUPP; | |
2594 | ||
2595 | ret = i3c_master_check_ops(ops); | |
2596 | if (ret) | |
2597 | return ret; | |
2598 | ||
2599 | master->dev.parent = parent; | |
2600 | master->dev.of_node = of_node_get(parent->of_node); | |
2601 | master->dev.bus = &i3c_bus_type; | |
2602 | master->dev.type = &i3c_masterdev_type; | |
2603 | master->dev.release = i3c_masterdev_release; | |
2604 | master->ops = ops; | |
2605 | master->secondary = secondary; | |
2606 | INIT_LIST_HEAD(&master->boardinfo.i2c); | |
2607 | INIT_LIST_HEAD(&master->boardinfo.i3c); | |
2608 | ||
2609 | ret = i3c_bus_init(i3cbus); | |
2610 | if (ret) | |
2611 | return ret; | |
2612 | ||
2613 | device_initialize(&master->dev); | |
2614 | dev_set_name(&master->dev, "i3c-%d", i3cbus->id); | |
2615 | ||
2616 | ret = of_populate_i3c_bus(master); | |
2617 | if (ret) | |
2618 | goto err_put_dev; | |
2619 | ||
2620 | list_for_each_entry(i2cbi, &master->boardinfo.i2c, node) { | |
2621 | switch (i2cbi->lvr & I3C_LVR_I2C_INDEX_MASK) { | |
2622 | case I3C_LVR_I2C_INDEX(0): | |
2623 | if (mode < I3C_BUS_MODE_MIXED_FAST) | |
2624 | mode = I3C_BUS_MODE_MIXED_FAST; | |
2625 | break; | |
2626 | case I3C_LVR_I2C_INDEX(1): | |
cbf4f732 VS |
2627 | if (mode < I3C_BUS_MODE_MIXED_LIMITED) |
2628 | mode = I3C_BUS_MODE_MIXED_LIMITED; | |
2629 | break; | |
3a379bbc BB |
2630 | case I3C_LVR_I2C_INDEX(2): |
2631 | if (mode < I3C_BUS_MODE_MIXED_SLOW) | |
2632 | mode = I3C_BUS_MODE_MIXED_SLOW; | |
2633 | break; | |
2634 | default: | |
2635 | ret = -EINVAL; | |
2636 | goto err_put_dev; | |
2637 | } | |
ecc8fb54 VS |
2638 | |
2639 | if (i2cbi->lvr & I3C_LVR_I2C_FM_MODE) | |
2640 | i2c_scl_rate = I3C_BUS_I2C_FM_SCL_RATE; | |
3a379bbc BB |
2641 | } |
2642 | ||
ecc8fb54 | 2643 | ret = i3c_bus_set_mode(i3cbus, mode, i2c_scl_rate); |
3a379bbc BB |
2644 | if (ret) |
2645 | goto err_put_dev; | |
2646 | ||
2647 | master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent)); | |
2648 | if (!master->wq) { | |
2649 | ret = -ENOMEM; | |
2650 | goto err_put_dev; | |
2651 | } | |
2652 | ||
2653 | ret = i3c_master_bus_init(master); | |
2654 | if (ret) | |
0d95f41e | 2655 | goto err_put_dev; |
3a379bbc BB |
2656 | |
2657 | ret = device_add(&master->dev); | |
2658 | if (ret) | |
2659 | goto err_cleanup_bus; | |
2660 | ||
2661 | /* | |
2662 | * Expose our I3C bus as an I2C adapter so that I2C devices are exposed | |
2663 | * through the I2C subsystem. | |
2664 | */ | |
2665 | ret = i3c_master_i2c_adapter_init(master); | |
2666 | if (ret) | |
2667 | goto err_del_dev; | |
2668 | ||
2669 | /* | |
2670 | * We're done initializing the bus and the controller, we can now | |
708bc6ec | 2671 | * register I3C devices discovered during the initial DAA. |
3a379bbc BB |
2672 | */ |
2673 | master->init_done = true; | |
2674 | i3c_bus_normaluse_lock(&master->bus); | |
2675 | i3c_master_register_new_i3c_devs(master); | |
2676 | i3c_bus_normaluse_unlock(&master->bus); | |
2677 | ||
2678 | return 0; | |
2679 | ||
2680 | err_del_dev: | |
2681 | device_del(&master->dev); | |
2682 | ||
2683 | err_cleanup_bus: | |
2684 | i3c_master_bus_cleanup(master); | |
2685 | ||
2686 | err_put_dev: | |
2687 | put_device(&master->dev); | |
2688 | ||
2689 | return ret; | |
2690 | } | |
2691 | EXPORT_SYMBOL_GPL(i3c_master_register); | |
2692 | ||
2693 | /** | |
2694 | * i3c_master_unregister() - unregister an I3C master | |
2695 | * @master: master used to send frames on the bus | |
2696 | * | |
2697 | * Basically undo everything done in i3c_master_register(). | |
2698 | * | |
2699 | * Return: 0 in case of success, a negative error code otherwise. | |
2700 | */ | |
2701 | int i3c_master_unregister(struct i3c_master_controller *master) | |
2702 | { | |
2703 | i3c_master_i2c_adapter_cleanup(master); | |
2704 | i3c_master_unregister_i3c_devs(master); | |
2705 | i3c_master_bus_cleanup(master); | |
2706 | device_unregister(&master->dev); | |
2707 | ||
2708 | return 0; | |
2709 | } | |
2710 | EXPORT_SYMBOL_GPL(i3c_master_unregister); | |
2711 | ||
2712 | int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev, | |
2713 | struct i3c_priv_xfer *xfers, | |
2714 | int nxfers) | |
2715 | { | |
2716 | struct i3c_master_controller *master; | |
2717 | ||
2718 | if (!dev) | |
2719 | return -ENOENT; | |
2720 | ||
2721 | master = i3c_dev_get_master(dev); | |
2722 | if (!master || !xfers) | |
2723 | return -EINVAL; | |
2724 | ||
2725 | if (!master->ops->priv_xfers) | |
2726 | return -ENOTSUPP; | |
2727 | ||
2728 | return master->ops->priv_xfers(dev, xfers, nxfers); | |
2729 | } | |
2730 | ||
2731 | int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev) | |
2732 | { | |
2733 | struct i3c_master_controller *master; | |
2734 | int ret; | |
2735 | ||
2736 | if (!dev->ibi) | |
2737 | return -EINVAL; | |
2738 | ||
2739 | master = i3c_dev_get_master(dev); | |
2740 | ret = master->ops->disable_ibi(dev); | |
2741 | if (ret) | |
2742 | return ret; | |
2743 | ||
2744 | reinit_completion(&dev->ibi->all_ibis_handled); | |
2745 | if (atomic_read(&dev->ibi->pending_ibis)) | |
2746 | wait_for_completion(&dev->ibi->all_ibis_handled); | |
2747 | ||
2748 | dev->ibi->enabled = false; | |
2749 | ||
2750 | return 0; | |
2751 | } | |
2752 | ||
2753 | int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev) | |
2754 | { | |
2755 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
2756 | int ret; | |
2757 | ||
2758 | if (!dev->ibi) | |
2759 | return -EINVAL; | |
2760 | ||
2761 | ret = master->ops->enable_ibi(dev); | |
2762 | if (!ret) | |
2763 | dev->ibi->enabled = true; | |
2764 | ||
2765 | return ret; | |
2766 | } | |
2767 | ||
2768 | int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev, | |
2769 | const struct i3c_ibi_setup *req) | |
2770 | { | |
2771 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
2772 | struct i3c_device_ibi_info *ibi; | |
2773 | int ret; | |
2774 | ||
2775 | if (!master->ops->request_ibi) | |
2776 | return -ENOTSUPP; | |
2777 | ||
2778 | if (dev->ibi) | |
2779 | return -EBUSY; | |
2780 | ||
2781 | ibi = kzalloc(sizeof(*ibi), GFP_KERNEL); | |
2782 | if (!ibi) | |
2783 | return -ENOMEM; | |
2784 | ||
2785 | atomic_set(&ibi->pending_ibis, 0); | |
2786 | init_completion(&ibi->all_ibis_handled); | |
2787 | ibi->handler = req->handler; | |
2788 | ibi->max_payload_len = req->max_payload_len; | |
2789 | ibi->num_slots = req->num_slots; | |
2790 | ||
2791 | dev->ibi = ibi; | |
2792 | ret = master->ops->request_ibi(dev, req); | |
2793 | if (ret) { | |
2794 | kfree(ibi); | |
2795 | dev->ibi = NULL; | |
2796 | } | |
2797 | ||
2798 | return ret; | |
2799 | } | |
2800 | ||
2801 | void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev) | |
2802 | { | |
2803 | struct i3c_master_controller *master = i3c_dev_get_master(dev); | |
2804 | ||
2805 | if (!dev->ibi) | |
2806 | return; | |
2807 | ||
2808 | if (WARN_ON(dev->ibi->enabled)) | |
2809 | WARN_ON(i3c_dev_disable_ibi_locked(dev)); | |
2810 | ||
2811 | master->ops->free_ibi(dev); | |
2812 | kfree(dev->ibi); | |
2813 | dev->ibi = NULL; | |
2814 | } | |
2815 | ||
2816 | static int __init i3c_init(void) | |
2817 | { | |
72a4501b JI |
2818 | int res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier); |
2819 | ||
2820 | if (res) | |
2821 | return res; | |
2822 | ||
2823 | res = bus_register(&i3c_bus_type); | |
2824 | if (res) | |
2825 | goto out_unreg_notifier; | |
2826 | ||
2827 | return 0; | |
2828 | ||
2829 | out_unreg_notifier: | |
2830 | bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier); | |
2831 | ||
2832 | return res; | |
3a379bbc BB |
2833 | } |
2834 | subsys_initcall(i3c_init); | |
2835 | ||
2836 | static void __exit i3c_exit(void) | |
2837 | { | |
72a4501b | 2838 | bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier); |
3a379bbc BB |
2839 | idr_destroy(&i3c_bus_idr); |
2840 | bus_unregister(&i3c_bus_type); | |
2841 | } | |
2842 | module_exit(i3c_exit); | |
2843 | ||
2844 | MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>"); | |
2845 | MODULE_DESCRIPTION("I3C core"); | |
2846 | MODULE_LICENSE("GPL v2"); |