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7c3cd189 VK |
1 | // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) |
2 | // Copyright(c) 2015-17 Intel Corporation. | |
3 | ||
4 | #include <linux/acpi.h> | |
0231453b | 5 | #include <linux/delay.h> |
7c3cd189 | 6 | #include <linux/mod_devicetable.h> |
9d715fa0 VK |
7 | #include <linux/pm_runtime.h> |
8 | #include <linux/soundwire/sdw_registers.h> | |
7c3cd189 | 9 | #include <linux/soundwire/sdw.h> |
bd29c00e | 10 | #include <linux/soundwire/sdw_type.h> |
7c3cd189 | 11 | #include "bus.h" |
3b6c4a11 | 12 | #include "irq.h" |
bcac5902 | 13 | #include "sysfs_local.h" |
7c3cd189 | 14 | |
88de0a8f | 15 | static DEFINE_IDA(sdw_bus_ida); |
dbb50c7a BL |
16 | |
17 | static int sdw_get_id(struct sdw_bus *bus) | |
18 | { | |
88de0a8f | 19 | int rc = ida_alloc(&sdw_bus_ida, GFP_KERNEL); |
dbb50c7a BL |
20 | |
21 | if (rc < 0) | |
22 | return rc; | |
23 | ||
24 | bus->id = rc; | |
25 | return 0; | |
26 | } | |
27 | ||
7c3cd189 | 28 | /** |
5cab3ff2 | 29 | * sdw_bus_master_add() - add a bus Master instance |
7c3cd189 | 30 | * @bus: bus instance |
5cab3ff2 PLB |
31 | * @parent: parent device |
32 | * @fwnode: firmware node handle | |
7c3cd189 VK |
33 | * |
34 | * Initializes the bus instance, read properties and create child | |
35 | * devices. | |
36 | */ | |
5cab3ff2 PLB |
37 | int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, |
38 | struct fwnode_handle *fwnode) | |
7c3cd189 | 39 | { |
5c3eb9f7 | 40 | struct sdw_master_prop *prop = NULL; |
7c3cd189 VK |
41 | int ret; |
42 | ||
7ceaa40b PLB |
43 | if (!parent) { |
44 | pr_err("SoundWire parent device is not set\n"); | |
7c3cd189 VK |
45 | return -ENODEV; |
46 | } | |
47 | ||
dbb50c7a | 48 | ret = sdw_get_id(bus); |
a5759f19 | 49 | if (ret < 0) { |
7ceaa40b PLB |
50 | dev_err(parent, "Failed to get bus id\n"); |
51 | return ret; | |
52 | } | |
53 | ||
54 | ret = sdw_master_device_add(bus, parent, fwnode); | |
a5759f19 | 55 | if (ret < 0) { |
7ceaa40b PLB |
56 | dev_err(parent, "Failed to add master device at link %d\n", |
57 | bus->link_id); | |
dbb50c7a BL |
58 | return ret; |
59 | } | |
60 | ||
9d715fa0 | 61 | if (!bus->ops) { |
17ed5bef | 62 | dev_err(bus->dev, "SoundWire Bus ops are not set\n"); |
9d715fa0 VK |
63 | return -EINVAL; |
64 | } | |
65 | ||
9026118f BL |
66 | if (!bus->compute_params) { |
67 | dev_err(bus->dev, | |
68 | "Bandwidth allocation not configured, compute_params no set\n"); | |
69 | return -EINVAL; | |
70 | } | |
71 | ||
256a9978 RF |
72 | /* |
73 | * Give each bus_lock and msg_lock a unique key so that lockdep won't | |
74 | * trigger a deadlock warning when the locks of several buses are | |
75 | * grabbed during configuration of a multi-bus stream. | |
76 | */ | |
77 | lockdep_register_key(&bus->msg_lock_key); | |
78 | __mutex_init(&bus->msg_lock, "msg_lock", &bus->msg_lock_key); | |
79 | ||
80 | lockdep_register_key(&bus->bus_lock_key); | |
81 | __mutex_init(&bus->bus_lock, "bus_lock", &bus->bus_lock_key); | |
82 | ||
7c3cd189 | 83 | INIT_LIST_HEAD(&bus->slaves); |
89e59053 | 84 | INIT_LIST_HEAD(&bus->m_rt_list); |
7c3cd189 | 85 | |
ce6e74d0 SN |
86 | /* |
87 | * Initialize multi_link flag | |
ce6e74d0 SN |
88 | */ |
89 | bus->multi_link = false; | |
56d4fe31 VK |
90 | if (bus->ops->read_prop) { |
91 | ret = bus->ops->read_prop(bus); | |
92 | if (ret < 0) { | |
62f0cec3 VK |
93 | dev_err(bus->dev, |
94 | "Bus read properties failed:%d\n", ret); | |
56d4fe31 VK |
95 | return ret; |
96 | } | |
97 | } | |
98 | ||
bf03473d PLB |
99 | sdw_bus_debugfs_init(bus); |
100 | ||
7c3cd189 | 101 | /* |
21c2de29 | 102 | * Device numbers in SoundWire are 0 through 15. Enumeration device |
7c3cd189 VK |
103 | * number (0), Broadcast device number (15), Group numbers (12 and |
104 | * 13) and Master device number (14) are not used for assignment so | |
105 | * mask these and other higher bits. | |
106 | */ | |
107 | ||
108 | /* Set higher order bits */ | |
109 | *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM); | |
110 | ||
111 | /* Set enumuration device number and broadcast device number */ | |
112 | set_bit(SDW_ENUM_DEV_NUM, bus->assigned); | |
113 | set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned); | |
114 | ||
115 | /* Set group device numbers and master device number */ | |
116 | set_bit(SDW_GROUP12_DEV_NUM, bus->assigned); | |
117 | set_bit(SDW_GROUP13_DEV_NUM, bus->assigned); | |
118 | set_bit(SDW_MASTER_DEV_NUM, bus->assigned); | |
119 | ||
120 | /* | |
121 | * SDW is an enumerable bus, but devices can be powered off. So, | |
122 | * they won't be able to report as present. | |
123 | * | |
124 | * Create Slave devices based on Slaves described in | |
125 | * the respective firmware (ACPI/DT) | |
126 | */ | |
127 | if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev)) | |
128 | ret = sdw_acpi_find_slaves(bus); | |
a2e48458 SK |
129 | else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node) |
130 | ret = sdw_of_find_slaves(bus); | |
7c3cd189 VK |
131 | else |
132 | ret = -ENOTSUPP; /* No ACPI/DT so error out */ | |
133 | ||
a5759f19 | 134 | if (ret < 0) { |
7c3cd189 VK |
135 | dev_err(bus->dev, "Finding slaves failed:%d\n", ret); |
136 | return ret; | |
137 | } | |
138 | ||
99b8a5d6 | 139 | /* |
5c3eb9f7 | 140 | * Initialize clock values based on Master properties. The max |
3424305b | 141 | * frequency is read from max_clk_freq property. Current assumption |
5c3eb9f7 SK |
142 | * is that the bus will start at highest clock frequency when |
143 | * powered on. | |
144 | * | |
99b8a5d6 SK |
145 | * Default active bank will be 0 as out of reset the Slaves have |
146 | * to start with bank 0 (Table 40 of Spec) | |
147 | */ | |
5c3eb9f7 | 148 | prop = &bus->prop; |
3424305b | 149 | bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR; |
5c3eb9f7 | 150 | bus->params.curr_dr_freq = bus->params.max_dr_freq; |
99b8a5d6 SK |
151 | bus->params.curr_bank = SDW_BANK0; |
152 | bus->params.next_bank = SDW_BANK1; | |
153 | ||
3b6c4a11 CK |
154 | ret = sdw_irq_create(bus, fwnode); |
155 | if (ret) | |
156 | return ret; | |
12a95123 | 157 | |
7c3cd189 VK |
158 | return 0; |
159 | } | |
5cab3ff2 | 160 | EXPORT_SYMBOL(sdw_bus_master_add); |
7c3cd189 VK |
161 | |
162 | static int sdw_delete_slave(struct device *dev, void *data) | |
163 | { | |
164 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
165 | struct sdw_bus *bus = slave->bus; | |
166 | ||
dff70572 PLB |
167 | pm_runtime_disable(dev); |
168 | ||
bf03473d PLB |
169 | sdw_slave_debugfs_exit(slave); |
170 | ||
7c3cd189 VK |
171 | mutex_lock(&bus->bus_lock); |
172 | ||
c6056101 | 173 | if (slave->dev_num) { /* clear dev_num if assigned */ |
7c3cd189 | 174 | clear_bit(slave->dev_num, bus->assigned); |
39d80b0e PLB |
175 | if (bus->ops && bus->ops->put_device_num) |
176 | bus->ops->put_device_num(bus, slave); | |
c6056101 | 177 | } |
7c3cd189 VK |
178 | list_del_init(&slave->node); |
179 | mutex_unlock(&bus->bus_lock); | |
180 | ||
181 | device_unregister(dev); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | /** | |
5cab3ff2 | 186 | * sdw_bus_master_delete() - delete the bus master instance |
7c3cd189 VK |
187 | * @bus: bus to be deleted |
188 | * | |
189 | * Remove the instance, delete the child devices. | |
190 | */ | |
5cab3ff2 | 191 | void sdw_bus_master_delete(struct sdw_bus *bus) |
7c3cd189 VK |
192 | { |
193 | device_for_each_child(bus->dev, NULL, sdw_delete_slave); | |
12a95123 | 194 | |
3b6c4a11 | 195 | sdw_irq_delete(bus); |
12a95123 | 196 | |
7ceaa40b | 197 | sdw_master_device_del(bus); |
bf03473d PLB |
198 | |
199 | sdw_bus_debugfs_exit(bus); | |
256a9978 RF |
200 | lockdep_unregister_key(&bus->bus_lock_key); |
201 | lockdep_unregister_key(&bus->msg_lock_key); | |
88de0a8f | 202 | ida_free(&sdw_bus_ida, bus->id); |
7c3cd189 | 203 | } |
5cab3ff2 | 204 | EXPORT_SYMBOL(sdw_bus_master_delete); |
7c3cd189 | 205 | |
9d715fa0 VK |
206 | /* |
207 | * SDW IO Calls | |
208 | */ | |
209 | ||
210 | static inline int find_response_code(enum sdw_command_response resp) | |
211 | { | |
212 | switch (resp) { | |
213 | case SDW_CMD_OK: | |
214 | return 0; | |
215 | ||
216 | case SDW_CMD_IGNORED: | |
217 | return -ENODATA; | |
218 | ||
219 | case SDW_CMD_TIMEOUT: | |
220 | return -ETIMEDOUT; | |
221 | ||
222 | default: | |
223 | return -EIO; | |
224 | } | |
225 | } | |
226 | ||
227 | static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg) | |
228 | { | |
229 | int retry = bus->prop.err_threshold; | |
230 | enum sdw_command_response resp; | |
231 | int ret = 0, i; | |
232 | ||
233 | for (i = 0; i <= retry; i++) { | |
234 | resp = bus->ops->xfer_msg(bus, msg); | |
235 | ret = find_response_code(resp); | |
236 | ||
237 | /* if cmd is ok or ignored return */ | |
238 | if (ret == 0 || ret == -ENODATA) | |
239 | return ret; | |
240 | } | |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | static inline int do_transfer_defer(struct sdw_bus *bus, | |
45cb70f9 | 246 | struct sdw_msg *msg) |
9d715fa0 | 247 | { |
45cb70f9 | 248 | struct sdw_defer *defer = &bus->defer_msg; |
9d715fa0 VK |
249 | int retry = bus->prop.err_threshold; |
250 | enum sdw_command_response resp; | |
251 | int ret = 0, i; | |
252 | ||
253 | defer->msg = msg; | |
254 | defer->length = msg->len; | |
a306a0e4 | 255 | init_completion(&defer->complete); |
9d715fa0 VK |
256 | |
257 | for (i = 0; i <= retry; i++) { | |
66f95de7 | 258 | resp = bus->ops->xfer_msg_defer(bus); |
9d715fa0 VK |
259 | ret = find_response_code(resp); |
260 | /* if cmd is ok or ignored return */ | |
261 | if (ret == 0 || ret == -ENODATA) | |
262 | return ret; | |
263 | } | |
264 | ||
265 | return ret; | |
266 | } | |
267 | ||
a350aff4 PLB |
268 | static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg) |
269 | { | |
270 | int ret; | |
271 | ||
272 | ret = do_transfer(bus, msg); | |
273 | if (ret != 0 && ret != -ENODATA) | |
ec475187 BL |
274 | dev_err(bus->dev, "trf on Slave %d failed:%d %s addr %x count %d\n", |
275 | msg->dev_num, ret, | |
276 | (msg->flags & SDW_MSG_FLAG_WRITE) ? "write" : "read", | |
277 | msg->addr, msg->len); | |
a350aff4 | 278 | |
a350aff4 PLB |
279 | return ret; |
280 | } | |
281 | ||
9d715fa0 VK |
282 | /** |
283 | * sdw_transfer() - Synchronous transfer message to a SDW Slave device | |
284 | * @bus: SDW bus | |
285 | * @msg: SDW message to be xfered | |
286 | */ | |
287 | int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg) | |
288 | { | |
289 | int ret; | |
290 | ||
291 | mutex_lock(&bus->msg_lock); | |
292 | ||
a350aff4 | 293 | ret = sdw_transfer_unlocked(bus, msg); |
9d715fa0 VK |
294 | |
295 | mutex_unlock(&bus->msg_lock); | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
79fe02cb PLB |
300 | /** |
301 | * sdw_show_ping_status() - Direct report of PING status, to be used by Peripheral drivers | |
302 | * @bus: SDW bus | |
303 | * @sync_delay: Delay before reading status | |
304 | */ | |
305 | void sdw_show_ping_status(struct sdw_bus *bus, bool sync_delay) | |
306 | { | |
307 | u32 status; | |
308 | ||
309 | if (!bus->ops->read_ping_status) | |
310 | return; | |
311 | ||
312 | /* | |
313 | * wait for peripheral to sync if desired. 10-15ms should be more than | |
314 | * enough in most cases. | |
315 | */ | |
316 | if (sync_delay) | |
317 | usleep_range(10000, 15000); | |
318 | ||
319 | mutex_lock(&bus->msg_lock); | |
320 | ||
321 | status = bus->ops->read_ping_status(bus); | |
322 | ||
323 | mutex_unlock(&bus->msg_lock); | |
324 | ||
325 | if (!status) | |
326 | dev_warn(bus->dev, "%s: no peripherals attached\n", __func__); | |
327 | else | |
328 | dev_dbg(bus->dev, "PING status: %#x\n", status); | |
329 | } | |
330 | EXPORT_SYMBOL(sdw_show_ping_status); | |
331 | ||
9d715fa0 VK |
332 | /** |
333 | * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device | |
334 | * @bus: SDW bus | |
335 | * @msg: SDW message to be xfered | |
9d715fa0 VK |
336 | * |
337 | * Caller needs to hold the msg_lock lock while calling this | |
338 | */ | |
45cb70f9 | 339 | int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg) |
9d715fa0 VK |
340 | { |
341 | int ret; | |
342 | ||
343 | if (!bus->ops->xfer_msg_defer) | |
344 | return -ENOTSUPP; | |
345 | ||
45cb70f9 | 346 | ret = do_transfer_defer(bus, msg); |
9d715fa0 VK |
347 | if (ret != 0 && ret != -ENODATA) |
348 | dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n", | |
73ede046 | 349 | msg->dev_num, ret); |
9d715fa0 | 350 | |
9d715fa0 VK |
351 | return ret; |
352 | } | |
353 | ||
9d715fa0 | 354 | int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, |
73ede046 | 355 | u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf) |
9d715fa0 VK |
356 | { |
357 | memset(msg, 0, sizeof(*msg)); | |
358 | msg->addr = addr; /* addr is 16 bit and truncated here */ | |
359 | msg->len = count; | |
360 | msg->dev_num = dev_num; | |
361 | msg->flags = flags; | |
362 | msg->buf = buf; | |
9d715fa0 | 363 | |
f779ad09 | 364 | if (addr < SDW_REG_NO_PAGE) /* no paging area */ |
9d715fa0 | 365 | return 0; |
f779ad09 GL |
366 | |
367 | if (addr >= SDW_REG_MAX) { /* illegal addr */ | |
9d715fa0 VK |
368 | pr_err("SDW: Invalid address %x passed\n", addr); |
369 | return -EINVAL; | |
370 | } | |
371 | ||
372 | if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */ | |
373 | if (slave && !slave->prop.paging_support) | |
374 | return 0; | |
21c2de29 | 375 | /* no need for else as that will fall-through to paging */ |
9d715fa0 VK |
376 | } |
377 | ||
378 | /* paging mandatory */ | |
379 | if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) { | |
380 | pr_err("SDW: Invalid device for paging :%d\n", dev_num); | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | if (!slave) { | |
385 | pr_err("SDW: No slave for paging addr\n"); | |
386 | return -EINVAL; | |
f779ad09 GL |
387 | } |
388 | ||
389 | if (!slave->prop.paging_support) { | |
9d715fa0 | 390 | dev_err(&slave->dev, |
17ed5bef | 391 | "address %x needs paging but no support\n", addr); |
9d715fa0 VK |
392 | return -EINVAL; |
393 | } | |
394 | ||
d5826a4b VK |
395 | msg->addr_page1 = FIELD_GET(SDW_SCP_ADDRPAGE1_MASK, addr); |
396 | msg->addr_page2 = FIELD_GET(SDW_SCP_ADDRPAGE2_MASK, addr); | |
9d715fa0 VK |
397 | msg->addr |= BIT(15); |
398 | msg->page = true; | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
60ee9be2 PLB |
403 | /* |
404 | * Read/Write IO functions. | |
60ee9be2 PLB |
405 | */ |
406 | ||
d005ea71 CK |
407 | static int sdw_ntransfer_no_pm(struct sdw_slave *slave, u32 addr, u8 flags, |
408 | size_t count, u8 *val) | |
409 | { | |
410 | struct sdw_msg msg; | |
411 | size_t size; | |
412 | int ret; | |
413 | ||
414 | while (count) { | |
415 | // Only handle bytes up to next page boundary | |
416 | size = min_t(size_t, count, (SDW_REGADDR + 1) - (addr & SDW_REGADDR)); | |
417 | ||
418 | ret = sdw_fill_msg(&msg, slave, addr, size, slave->dev_num, flags, val); | |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
422 | ret = sdw_transfer(slave->bus, &msg); | |
423 | if (ret < 0 && !slave->is_mockup_device) | |
424 | return ret; | |
425 | ||
426 | addr += size; | |
427 | val += size; | |
428 | count -= size; | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
d94e1e01 CK |
434 | /** |
435 | * sdw_nread_no_pm() - Read "n" contiguous SDW Slave registers with no PM | |
436 | * @slave: SDW Slave | |
437 | * @addr: Register address | |
438 | * @count: length | |
439 | * @val: Buffer for values to be read | |
d005ea71 CK |
440 | * |
441 | * Note that if the message crosses a page boundary each page will be | |
442 | * transferred under a separate invocation of the msg_lock. | |
d94e1e01 | 443 | */ |
62dc9f3f | 444 | int sdw_nread_no_pm(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) |
60ee9be2 | 445 | { |
d005ea71 | 446 | return sdw_ntransfer_no_pm(slave, addr, SDW_MSG_FLAG_READ, count, val); |
60ee9be2 | 447 | } |
62dc9f3f | 448 | EXPORT_SYMBOL(sdw_nread_no_pm); |
60ee9be2 | 449 | |
d94e1e01 CK |
450 | /** |
451 | * sdw_nwrite_no_pm() - Write "n" contiguous SDW Slave registers with no PM | |
452 | * @slave: SDW Slave | |
453 | * @addr: Register address | |
454 | * @count: length | |
455 | * @val: Buffer for values to be written | |
d005ea71 CK |
456 | * |
457 | * Note that if the message crosses a page boundary each page will be | |
458 | * transferred under a separate invocation of the msg_lock. | |
d94e1e01 | 459 | */ |
62dc9f3f | 460 | int sdw_nwrite_no_pm(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) |
60ee9be2 | 461 | { |
d005ea71 | 462 | return sdw_ntransfer_no_pm(slave, addr, SDW_MSG_FLAG_WRITE, count, (u8 *)val); |
60ee9be2 | 463 | } |
62dc9f3f | 464 | EXPORT_SYMBOL(sdw_nwrite_no_pm); |
60ee9be2 | 465 | |
d94e1e01 CK |
466 | /** |
467 | * sdw_write_no_pm() - Write a SDW Slave register with no PM | |
468 | * @slave: SDW Slave | |
469 | * @addr: Register address | |
470 | * @value: Register value | |
471 | */ | |
167790ab | 472 | int sdw_write_no_pm(struct sdw_slave *slave, u32 addr, u8 value) |
60ee9be2 PLB |
473 | { |
474 | return sdw_nwrite_no_pm(slave, addr, 1, &value); | |
475 | } | |
167790ab | 476 | EXPORT_SYMBOL(sdw_write_no_pm); |
60ee9be2 | 477 | |
0231453b RW |
478 | static int |
479 | sdw_bread_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr) | |
480 | { | |
481 | struct sdw_msg msg; | |
482 | u8 buf; | |
483 | int ret; | |
484 | ||
485 | ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, | |
486 | SDW_MSG_FLAG_READ, &buf); | |
a5759f19 | 487 | if (ret < 0) |
0231453b RW |
488 | return ret; |
489 | ||
490 | ret = sdw_transfer(bus, &msg); | |
491 | if (ret < 0) | |
492 | return ret; | |
f779ad09 GL |
493 | |
494 | return buf; | |
0231453b RW |
495 | } |
496 | ||
497 | static int | |
498 | sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value) | |
499 | { | |
500 | struct sdw_msg msg; | |
501 | int ret; | |
502 | ||
503 | ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, | |
504 | SDW_MSG_FLAG_WRITE, &value); | |
a5759f19 | 505 | if (ret < 0) |
0231453b RW |
506 | return ret; |
507 | ||
508 | return sdw_transfer(bus, &msg); | |
509 | } | |
510 | ||
a350aff4 PLB |
511 | int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr) |
512 | { | |
513 | struct sdw_msg msg; | |
514 | u8 buf; | |
515 | int ret; | |
516 | ||
517 | ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, | |
518 | SDW_MSG_FLAG_READ, &buf); | |
a5759f19 | 519 | if (ret < 0) |
a350aff4 PLB |
520 | return ret; |
521 | ||
522 | ret = sdw_transfer_unlocked(bus, &msg); | |
523 | if (ret < 0) | |
524 | return ret; | |
525 | ||
526 | return buf; | |
527 | } | |
528 | EXPORT_SYMBOL(sdw_bread_no_pm_unlocked); | |
529 | ||
530 | int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value) | |
531 | { | |
532 | struct sdw_msg msg; | |
533 | int ret; | |
534 | ||
535 | ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num, | |
536 | SDW_MSG_FLAG_WRITE, &value); | |
a5759f19 | 537 | if (ret < 0) |
a350aff4 PLB |
538 | return ret; |
539 | ||
540 | return sdw_transfer_unlocked(bus, &msg); | |
541 | } | |
542 | EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked); | |
543 | ||
d94e1e01 CK |
544 | /** |
545 | * sdw_read_no_pm() - Read a SDW Slave register with no PM | |
546 | * @slave: SDW Slave | |
547 | * @addr: Register address | |
548 | */ | |
167790ab | 549 | int sdw_read_no_pm(struct sdw_slave *slave, u32 addr) |
0231453b RW |
550 | { |
551 | u8 buf; | |
552 | int ret; | |
553 | ||
554 | ret = sdw_nread_no_pm(slave, addr, 1, &buf); | |
555 | if (ret < 0) | |
556 | return ret; | |
557 | else | |
558 | return buf; | |
559 | } | |
167790ab | 560 | EXPORT_SYMBOL(sdw_read_no_pm); |
0231453b | 561 | |
d38ebaf2 | 562 | int sdw_update_no_pm(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) |
b04c975e PLB |
563 | { |
564 | int tmp; | |
565 | ||
566 | tmp = sdw_read_no_pm(slave, addr); | |
567 | if (tmp < 0) | |
568 | return tmp; | |
569 | ||
570 | tmp = (tmp & ~mask) | val; | |
571 | return sdw_write_no_pm(slave, addr, tmp); | |
572 | } | |
d38ebaf2 PLB |
573 | EXPORT_SYMBOL(sdw_update_no_pm); |
574 | ||
575 | /* Read-Modify-Write Slave register */ | |
576 | int sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) | |
577 | { | |
578 | int tmp; | |
579 | ||
580 | tmp = sdw_read(slave, addr); | |
581 | if (tmp < 0) | |
582 | return tmp; | |
583 | ||
584 | tmp = (tmp & ~mask) | val; | |
585 | return sdw_write(slave, addr, tmp); | |
586 | } | |
587 | EXPORT_SYMBOL(sdw_update); | |
b04c975e | 588 | |
9d715fa0 VK |
589 | /** |
590 | * sdw_nread() - Read "n" contiguous SDW Slave registers | |
591 | * @slave: SDW Slave | |
592 | * @addr: Register address | |
593 | * @count: length | |
594 | * @val: Buffer for values to be read | |
d94e1e01 CK |
595 | * |
596 | * This version of the function will take a PM reference to the slave | |
597 | * device. | |
d005ea71 CK |
598 | * Note that if the message crosses a page boundary each page will be |
599 | * transferred under a separate invocation of the msg_lock. | |
9d715fa0 VK |
600 | */ |
601 | int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val) | |
602 | { | |
9d715fa0 VK |
603 | int ret; |
604 | ||
e9537962 RF |
605 | ret = pm_runtime_get_sync(&slave->dev); |
606 | if (ret < 0 && ret != -EACCES) { | |
607 | pm_runtime_put_noidle(&slave->dev); | |
9d715fa0 | 608 | return ret; |
e9537962 | 609 | } |
60ee9be2 PLB |
610 | |
611 | ret = sdw_nread_no_pm(slave, addr, count, val); | |
9d715fa0 | 612 | |
973794e8 PLB |
613 | pm_runtime_mark_last_busy(&slave->dev); |
614 | pm_runtime_put(&slave->dev); | |
9d715fa0 VK |
615 | |
616 | return ret; | |
617 | } | |
618 | EXPORT_SYMBOL(sdw_nread); | |
619 | ||
620 | /** | |
621 | * sdw_nwrite() - Write "n" contiguous SDW Slave registers | |
622 | * @slave: SDW Slave | |
623 | * @addr: Register address | |
624 | * @count: length | |
031e668b | 625 | * @val: Buffer for values to be written |
d94e1e01 CK |
626 | * |
627 | * This version of the function will take a PM reference to the slave | |
628 | * device. | |
d005ea71 CK |
629 | * Note that if the message crosses a page boundary each page will be |
630 | * transferred under a separate invocation of the msg_lock. | |
9d715fa0 | 631 | */ |
031e668b | 632 | int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, const u8 *val) |
9d715fa0 | 633 | { |
9d715fa0 VK |
634 | int ret; |
635 | ||
e9537962 RF |
636 | ret = pm_runtime_get_sync(&slave->dev); |
637 | if (ret < 0 && ret != -EACCES) { | |
638 | pm_runtime_put_noidle(&slave->dev); | |
9d715fa0 | 639 | return ret; |
e9537962 | 640 | } |
60ee9be2 PLB |
641 | |
642 | ret = sdw_nwrite_no_pm(slave, addr, count, val); | |
9d715fa0 | 643 | |
973794e8 PLB |
644 | pm_runtime_mark_last_busy(&slave->dev); |
645 | pm_runtime_put(&slave->dev); | |
9d715fa0 VK |
646 | |
647 | return ret; | |
648 | } | |
649 | EXPORT_SYMBOL(sdw_nwrite); | |
650 | ||
651 | /** | |
652 | * sdw_read() - Read a SDW Slave register | |
653 | * @slave: SDW Slave | |
654 | * @addr: Register address | |
d94e1e01 CK |
655 | * |
656 | * This version of the function will take a PM reference to the slave | |
657 | * device. | |
9d715fa0 VK |
658 | */ |
659 | int sdw_read(struct sdw_slave *slave, u32 addr) | |
660 | { | |
661 | u8 buf; | |
662 | int ret; | |
663 | ||
664 | ret = sdw_nread(slave, addr, 1, &buf); | |
665 | if (ret < 0) | |
666 | return ret; | |
f779ad09 GL |
667 | |
668 | return buf; | |
9d715fa0 VK |
669 | } |
670 | EXPORT_SYMBOL(sdw_read); | |
671 | ||
672 | /** | |
673 | * sdw_write() - Write a SDW Slave register | |
674 | * @slave: SDW Slave | |
675 | * @addr: Register address | |
676 | * @value: Register value | |
d94e1e01 CK |
677 | * |
678 | * This version of the function will take a PM reference to the slave | |
679 | * device. | |
9d715fa0 VK |
680 | */ |
681 | int sdw_write(struct sdw_slave *slave, u32 addr, u8 value) | |
682 | { | |
683 | return sdw_nwrite(slave, addr, 1, &value); | |
9d715fa0 VK |
684 | } |
685 | EXPORT_SYMBOL(sdw_write); | |
686 | ||
d52d7a1b SK |
687 | /* |
688 | * SDW alert handling | |
689 | */ | |
690 | ||
691 | /* called with bus_lock held */ | |
692 | static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i) | |
693 | { | |
1429cc26 | 694 | struct sdw_slave *slave; |
d52d7a1b SK |
695 | |
696 | list_for_each_entry(slave, &bus->slaves, node) { | |
697 | if (slave->dev_num == i) | |
698 | return slave; | |
699 | } | |
700 | ||
701 | return NULL; | |
702 | } | |
703 | ||
01ad444e | 704 | int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id) |
d52d7a1b | 705 | { |
2e8c4ad1 | 706 | if (slave->id.mfg_id != id.mfg_id || |
09830d5e | 707 | slave->id.part_id != id.part_id || |
2e8c4ad1 PLB |
708 | slave->id.class_id != id.class_id || |
709 | (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID && | |
710 | slave->id.unique_id != id.unique_id)) | |
d52d7a1b SK |
711 | return -ENODEV; |
712 | ||
713 | return 0; | |
714 | } | |
01ad444e | 715 | EXPORT_SYMBOL(sdw_compare_devid); |
d52d7a1b SK |
716 | |
717 | /* called with bus_lock held */ | |
718 | static int sdw_get_device_num(struct sdw_slave *slave) | |
719 | { | |
39d80b0e | 720 | struct sdw_bus *bus = slave->bus; |
d52d7a1b SK |
721 | int bit; |
722 | ||
39d80b0e PLB |
723 | if (bus->ops && bus->ops->get_device_num) { |
724 | bit = bus->ops->get_device_num(bus, slave); | |
c6056101 PLB |
725 | if (bit < 0) |
726 | goto err; | |
727 | } else { | |
39d80b0e | 728 | bit = find_first_zero_bit(bus->assigned, SDW_MAX_DEVICES); |
c6056101 PLB |
729 | if (bit == SDW_MAX_DEVICES) { |
730 | bit = -ENODEV; | |
731 | goto err; | |
732 | } | |
d52d7a1b SK |
733 | } |
734 | ||
735 | /* | |
736 | * Do not update dev_num in Slave data structure here, | |
737 | * Update once program dev_num is successful | |
738 | */ | |
39d80b0e | 739 | set_bit(bit, bus->assigned); |
d52d7a1b SK |
740 | |
741 | err: | |
742 | return bit; | |
743 | } | |
744 | ||
745 | static int sdw_assign_device_num(struct sdw_slave *slave) | |
746 | { | |
6d7a1ff7 | 747 | struct sdw_bus *bus = slave->bus; |
d52d7a1b | 748 | int ret, dev_num; |
fd6a3ac8 | 749 | bool new_device = false; |
d52d7a1b SK |
750 | |
751 | /* check first if device number is assigned, if so reuse that */ | |
752 | if (!slave->dev_num) { | |
fd6a3ac8 PLB |
753 | if (!slave->dev_num_sticky) { |
754 | mutex_lock(&slave->bus->bus_lock); | |
755 | dev_num = sdw_get_device_num(slave); | |
756 | mutex_unlock(&slave->bus->bus_lock); | |
757 | if (dev_num < 0) { | |
6d7a1ff7 | 758 | dev_err(bus->dev, "Get dev_num failed: %d\n", |
fd6a3ac8 PLB |
759 | dev_num); |
760 | return dev_num; | |
761 | } | |
762 | slave->dev_num = dev_num; | |
763 | slave->dev_num_sticky = dev_num; | |
764 | new_device = true; | |
765 | } else { | |
766 | slave->dev_num = slave->dev_num_sticky; | |
d52d7a1b | 767 | } |
fd6a3ac8 PLB |
768 | } |
769 | ||
770 | if (!new_device) | |
6d7a1ff7 | 771 | dev_dbg(bus->dev, |
f48f4fd9 PLB |
772 | "Slave already registered, reusing dev_num:%d\n", |
773 | slave->dev_num); | |
d52d7a1b | 774 | |
fd6a3ac8 PLB |
775 | /* Clear the slave->dev_num to transfer message on device 0 */ |
776 | dev_num = slave->dev_num; | |
777 | slave->dev_num = 0; | |
d52d7a1b | 778 | |
d300de4f | 779 | ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num); |
d52d7a1b | 780 | if (ret < 0) { |
6d7a1ff7 | 781 | dev_err(bus->dev, "Program device_num %d failed: %d\n", |
6e0ac6a6 | 782 | dev_num, ret); |
d52d7a1b SK |
783 | return ret; |
784 | } | |
785 | ||
786 | /* After xfer of msg, restore dev_num */ | |
fd6a3ac8 | 787 | slave->dev_num = slave->dev_num_sticky; |
d52d7a1b | 788 | |
6bac0d8d | 789 | if (bus->ops && bus->ops->new_peripheral_assigned) |
23afc82f | 790 | bus->ops->new_peripheral_assigned(bus, slave, dev_num); |
6bac0d8d | 791 | |
d52d7a1b SK |
792 | return 0; |
793 | } | |
794 | ||
7c3cd189 | 795 | void sdw_extract_slave_id(struct sdw_bus *bus, |
73ede046 | 796 | u64 addr, struct sdw_slave_id *id) |
7c3cd189 | 797 | { |
17ed5bef | 798 | dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr); |
7c3cd189 | 799 | |
2c6cff68 PLB |
800 | id->sdw_version = SDW_VERSION(addr); |
801 | id->unique_id = SDW_UNIQUE_ID(addr); | |
802 | id->mfg_id = SDW_MFG_ID(addr); | |
803 | id->part_id = SDW_PART_ID(addr); | |
804 | id->class_id = SDW_CLASS_ID(addr); | |
7c3cd189 VK |
805 | |
806 | dev_dbg(bus->dev, | |
c397efb7 PLB |
807 | "SDW Slave class_id 0x%02x, mfg_id 0x%04x, part_id 0x%04x, unique_id 0x%x, version 0x%x\n", |
808 | id->class_id, id->mfg_id, id->part_id, id->unique_id, id->sdw_version); | |
7c3cd189 | 809 | } |
01ad444e | 810 | EXPORT_SYMBOL(sdw_extract_slave_id); |
d52d7a1b | 811 | |
72124f07 | 812 | static int sdw_program_device_num(struct sdw_bus *bus, bool *programmed) |
d52d7a1b SK |
813 | { |
814 | u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0}; | |
815 | struct sdw_slave *slave, *_s; | |
816 | struct sdw_slave_id id; | |
817 | struct sdw_msg msg; | |
f03690f4 | 818 | bool found; |
d52d7a1b SK |
819 | int count = 0, ret; |
820 | u64 addr; | |
821 | ||
72124f07 RF |
822 | *programmed = false; |
823 | ||
d52d7a1b SK |
824 | /* No Slave, so use raw xfer api */ |
825 | ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0, | |
73ede046 | 826 | SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf); |
d52d7a1b SK |
827 | if (ret < 0) |
828 | return ret; | |
829 | ||
830 | do { | |
831 | ret = sdw_transfer(bus, &msg); | |
832 | if (ret == -ENODATA) { /* end of device id reads */ | |
6e0ac6a6 | 833 | dev_dbg(bus->dev, "No more devices to enumerate\n"); |
d52d7a1b SK |
834 | ret = 0; |
835 | break; | |
836 | } | |
837 | if (ret < 0) { | |
838 | dev_err(bus->dev, "DEVID read fail:%d\n", ret); | |
839 | break; | |
840 | } | |
841 | ||
842 | /* | |
843 | * Construct the addr and extract. Cast the higher shift | |
844 | * bits to avoid truncation due to size limit. | |
845 | */ | |
846 | addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) | | |
0132af05 CIK |
847 | ((u64)buf[2] << 24) | ((u64)buf[1] << 32) | |
848 | ((u64)buf[0] << 40); | |
d52d7a1b SK |
849 | |
850 | sdw_extract_slave_id(bus, addr, &id); | |
851 | ||
f03690f4 | 852 | found = false; |
d52d7a1b SK |
853 | /* Now compare with entries */ |
854 | list_for_each_entry_safe(slave, _s, &bus->slaves, node) { | |
855 | if (sdw_compare_devid(slave, id) == 0) { | |
856 | found = true; | |
857 | ||
7297f8fa RF |
858 | /* |
859 | * To prevent skipping state-machine stages don't | |
860 | * program a device until we've seen it UNATTACH. | |
861 | * Must return here because no other device on #0 | |
862 | * can be detected until this one has been | |
863 | * assigned a device ID. | |
864 | */ | |
865 | if (slave->status != SDW_SLAVE_UNATTACHED) | |
866 | return 0; | |
867 | ||
d52d7a1b SK |
868 | /* |
869 | * Assign a new dev_num to this Slave and | |
870 | * not mark it present. It will be marked | |
871 | * present after it reports ATTACHED on new | |
872 | * dev_num | |
873 | */ | |
874 | ret = sdw_assign_device_num(slave); | |
a5759f19 | 875 | if (ret < 0) { |
6d7a1ff7 | 876 | dev_err(bus->dev, |
17ed5bef | 877 | "Assign dev_num failed:%d\n", |
d52d7a1b SK |
878 | ret); |
879 | return ret; | |
880 | } | |
881 | ||
72124f07 RF |
882 | *programmed = true; |
883 | ||
d52d7a1b SK |
884 | break; |
885 | } | |
886 | } | |
887 | ||
d7b956b6 | 888 | if (!found) { |
d52d7a1b | 889 | /* TODO: Park this device in Group 13 */ |
fcb9d730 SK |
890 | |
891 | /* | |
892 | * add Slave device even if there is no platform | |
893 | * firmware description. There will be no driver probe | |
894 | * but the user/integration will be able to see the | |
895 | * device, enumeration status and device number in sysfs | |
896 | */ | |
897 | sdw_slave_add(bus, &id, NULL); | |
898 | ||
17ed5bef | 899 | dev_err(bus->dev, "Slave Entry not found\n"); |
d52d7a1b SK |
900 | } |
901 | ||
902 | count++; | |
903 | ||
904 | /* | |
905 | * Check till error out or retry (count) exhausts. | |
906 | * Device can drop off and rejoin during enumeration | |
907 | * so count till twice the bound. | |
908 | */ | |
909 | ||
910 | } while (ret == 0 && count < (SDW_MAX_DEVICES * 2)); | |
911 | ||
912 | return ret; | |
913 | } | |
914 | ||
915 | static void sdw_modify_slave_status(struct sdw_slave *slave, | |
73ede046 | 916 | enum sdw_slave_status status) |
d52d7a1b | 917 | { |
6d7a1ff7 PLB |
918 | struct sdw_bus *bus = slave->bus; |
919 | ||
920 | mutex_lock(&bus->bus_lock); | |
fb9469e5 | 921 | |
6d7a1ff7 | 922 | dev_vdbg(bus->dev, |
9af8c36a PLB |
923 | "changing status slave %d status %d new status %d\n", |
924 | slave->dev_num, slave->status, status); | |
fb9469e5 PLB |
925 | |
926 | if (status == SDW_SLAVE_UNATTACHED) { | |
927 | dev_dbg(&slave->dev, | |
9af8c36a PLB |
928 | "initializing enumeration and init completion for Slave %d\n", |
929 | slave->dev_num); | |
fb9469e5 | 930 | |
c40d6b32 JH |
931 | reinit_completion(&slave->enumeration_complete); |
932 | reinit_completion(&slave->initialization_complete); | |
fb9469e5 PLB |
933 | |
934 | } else if ((status == SDW_SLAVE_ATTACHED) && | |
935 | (slave->status == SDW_SLAVE_UNATTACHED)) { | |
936 | dev_dbg(&slave->dev, | |
9af8c36a PLB |
937 | "signaling enumeration completion for Slave %d\n", |
938 | slave->dev_num); | |
fb9469e5 | 939 | |
c40d6b32 | 940 | complete_all(&slave->enumeration_complete); |
fb9469e5 | 941 | } |
d52d7a1b | 942 | slave->status = status; |
6d7a1ff7 | 943 | mutex_unlock(&bus->bus_lock); |
d52d7a1b SK |
944 | } |
945 | ||
0231453b RW |
946 | static int sdw_slave_clk_stop_callback(struct sdw_slave *slave, |
947 | enum sdw_clk_stop_mode mode, | |
948 | enum sdw_clk_stop_type type) | |
949 | { | |
bd29c00e | 950 | int ret = 0; |
0231453b | 951 | |
bd29c00e PLB |
952 | mutex_lock(&slave->sdw_dev_lock); |
953 | ||
954 | if (slave->probed) { | |
955 | struct device *dev = &slave->dev; | |
956 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
957 | ||
958 | if (drv->ops && drv->ops->clk_stop) | |
959 | ret = drv->ops->clk_stop(slave, mode, type); | |
0231453b RW |
960 | } |
961 | ||
bd29c00e PLB |
962 | mutex_unlock(&slave->sdw_dev_lock); |
963 | ||
964 | return ret; | |
0231453b RW |
965 | } |
966 | ||
967 | static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave, | |
968 | enum sdw_clk_stop_mode mode, | |
969 | bool prepare) | |
970 | { | |
971 | bool wake_en; | |
972 | u32 val = 0; | |
973 | int ret; | |
974 | ||
975 | wake_en = slave->prop.wake_capable; | |
976 | ||
977 | if (prepare) { | |
978 | val = SDW_SCP_SYSTEMCTRL_CLK_STP_PREP; | |
979 | ||
980 | if (mode == SDW_CLK_STOP_MODE1) | |
981 | val |= SDW_SCP_SYSTEMCTRL_CLK_STP_MODE1; | |
982 | ||
983 | if (wake_en) | |
984 | val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN; | |
985 | } else { | |
665cf215 PLB |
986 | ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL); |
987 | if (ret < 0) { | |
b50bb8ba PLB |
988 | if (ret != -ENODATA) |
989 | dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret); | |
665cf215 PLB |
990 | return ret; |
991 | } | |
992 | val = ret; | |
0231453b RW |
993 | val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP); |
994 | } | |
995 | ||
996 | ret = sdw_write_no_pm(slave, SDW_SCP_SYSTEMCTRL, val); | |
997 | ||
b50bb8ba PLB |
998 | if (ret < 0 && ret != -ENODATA) |
999 | dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL write failed:%d\n", ret); | |
0231453b RW |
1000 | |
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num) | |
1005 | { | |
1006 | int retry = bus->clk_stop_timeout; | |
1007 | int val; | |
1008 | ||
1009 | do { | |
665cf215 PLB |
1010 | val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT); |
1011 | if (val < 0) { | |
9f9bc7d5 PLB |
1012 | if (val != -ENODATA) |
1013 | dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val); | |
665cf215 PLB |
1014 | return val; |
1015 | } | |
1016 | val &= SDW_SCP_STAT_CLK_STP_NF; | |
0231453b | 1017 | if (!val) { |
54a6ca4f | 1018 | dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d\n", |
af7254b4 | 1019 | dev_num); |
0231453b RW |
1020 | return 0; |
1021 | } | |
1022 | ||
1023 | usleep_range(1000, 1500); | |
1024 | retry--; | |
1025 | } while (retry); | |
1026 | ||
54a6ca4f | 1027 | dev_err(bus->dev, "clock stop prep/de-prep failed slave:%d\n", |
0231453b RW |
1028 | dev_num); |
1029 | ||
1030 | return -ETIMEDOUT; | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * sdw_bus_prep_clk_stop: prepare Slave(s) for clock stop | |
1035 | * | |
1036 | * @bus: SDW bus instance | |
1037 | * | |
1038 | * Query Slave for clock stop mode and prepare for that mode. | |
1039 | */ | |
1040 | int sdw_bus_prep_clk_stop(struct sdw_bus *bus) | |
1041 | { | |
0231453b RW |
1042 | bool simple_clk_stop = true; |
1043 | struct sdw_slave *slave; | |
1044 | bool is_slave = false; | |
1045 | int ret = 0; | |
1046 | ||
1047 | /* | |
1048 | * In order to save on transition time, prepare | |
1049 | * each Slave and then wait for all Slave(s) to be | |
1050 | * prepared for clock stop. | |
b50bb8ba PLB |
1051 | * If one of the Slave devices has lost sync and |
1052 | * replies with Command Ignored/-ENODATA, we continue | |
1053 | * the loop | |
0231453b RW |
1054 | */ |
1055 | list_for_each_entry(slave, &bus->slaves, node) { | |
1056 | if (!slave->dev_num) | |
1057 | continue; | |
1058 | ||
0231453b RW |
1059 | if (slave->status != SDW_SLAVE_ATTACHED && |
1060 | slave->status != SDW_SLAVE_ALERT) | |
1061 | continue; | |
1062 | ||
929cfee3 BL |
1063 | /* Identify if Slave(s) are available on Bus */ |
1064 | is_slave = true; | |
1065 | ||
345e9f5c PLB |
1066 | ret = sdw_slave_clk_stop_callback(slave, |
1067 | SDW_CLK_STOP_MODE0, | |
0231453b | 1068 | SDW_CLK_PRE_PREPARE); |
b50bb8ba PLB |
1069 | if (ret < 0 && ret != -ENODATA) { |
1070 | dev_err(&slave->dev, "clock stop pre-prepare cb failed:%d\n", ret); | |
0231453b RW |
1071 | return ret; |
1072 | } | |
1073 | ||
345e9f5c PLB |
1074 | /* Only prepare a Slave device if needed */ |
1075 | if (!slave->prop.simple_clk_stop_capable) { | |
0231453b | 1076 | simple_clk_stop = false; |
345e9f5c PLB |
1077 | |
1078 | ret = sdw_slave_clk_stop_prepare(slave, | |
1079 | SDW_CLK_STOP_MODE0, | |
1080 | true); | |
b50bb8ba PLB |
1081 | if (ret < 0 && ret != -ENODATA) { |
1082 | dev_err(&slave->dev, "clock stop prepare failed:%d\n", ret); | |
345e9f5c PLB |
1083 | return ret; |
1084 | } | |
1085 | } | |
0231453b RW |
1086 | } |
1087 | ||
18de2f72 CS |
1088 | /* Skip remaining clock stop preparation if no Slave is attached */ |
1089 | if (!is_slave) | |
b50bb8ba | 1090 | return 0; |
18de2f72 | 1091 | |
345e9f5c PLB |
1092 | /* |
1093 | * Don't wait for all Slaves to be ready if they follow the simple | |
1094 | * state machine | |
1095 | */ | |
18de2f72 | 1096 | if (!simple_clk_stop) { |
0231453b RW |
1097 | ret = sdw_bus_wait_for_clk_prep_deprep(bus, |
1098 | SDW_BROADCAST_DEV_NUM); | |
b50bb8ba PLB |
1099 | /* |
1100 | * if there are no Slave devices present and the reply is | |
1101 | * Command_Ignored/-ENODATA, we don't need to continue with the | |
1102 | * flow and can just return here. The error code is not modified | |
1103 | * and its handling left as an exercise for the caller. | |
1104 | */ | |
0231453b RW |
1105 | if (ret < 0) |
1106 | return ret; | |
1107 | } | |
1108 | ||
1109 | /* Inform slaves that prep is done */ | |
1110 | list_for_each_entry(slave, &bus->slaves, node) { | |
1111 | if (!slave->dev_num) | |
1112 | continue; | |
1113 | ||
1114 | if (slave->status != SDW_SLAVE_ATTACHED && | |
1115 | slave->status != SDW_SLAVE_ALERT) | |
1116 | continue; | |
1117 | ||
345e9f5c PLB |
1118 | ret = sdw_slave_clk_stop_callback(slave, |
1119 | SDW_CLK_STOP_MODE0, | |
1120 | SDW_CLK_POST_PREPARE); | |
0231453b | 1121 | |
b50bb8ba PLB |
1122 | if (ret < 0 && ret != -ENODATA) { |
1123 | dev_err(&slave->dev, "clock stop post-prepare cb failed:%d\n", ret); | |
1124 | return ret; | |
0231453b RW |
1125 | } |
1126 | } | |
1127 | ||
b50bb8ba | 1128 | return 0; |
0231453b RW |
1129 | } |
1130 | EXPORT_SYMBOL(sdw_bus_prep_clk_stop); | |
1131 | ||
1132 | /** | |
1133 | * sdw_bus_clk_stop: stop bus clock | |
1134 | * | |
1135 | * @bus: SDW bus instance | |
1136 | * | |
1137 | * After preparing the Slaves for clock stop, stop the clock by broadcasting | |
1138 | * write to SCP_CTRL register. | |
1139 | */ | |
1140 | int sdw_bus_clk_stop(struct sdw_bus *bus) | |
1141 | { | |
1142 | int ret; | |
1143 | ||
1144 | /* | |
1145 | * broadcast clock stop now, attached Slaves will ACK this, | |
1146 | * unattached will ignore | |
1147 | */ | |
1148 | ret = sdw_bwrite_no_pm(bus, SDW_BROADCAST_DEV_NUM, | |
1149 | SDW_SCP_CTRL, SDW_SCP_CTRL_CLK_STP_NOW); | |
1150 | if (ret < 0) { | |
b50bb8ba PLB |
1151 | if (ret != -ENODATA) |
1152 | dev_err(bus->dev, "ClockStopNow Broadcast msg failed %d\n", ret); | |
0231453b RW |
1153 | return ret; |
1154 | } | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | EXPORT_SYMBOL(sdw_bus_clk_stop); | |
1159 | ||
1160 | /** | |
1161 | * sdw_bus_exit_clk_stop: Exit clock stop mode | |
1162 | * | |
1163 | * @bus: SDW bus instance | |
1164 | * | |
1165 | * This De-prepares the Slaves by exiting Clock Stop Mode 0. For the Slaves | |
1166 | * exiting Clock Stop Mode 1, they will be de-prepared after they enumerate | |
1167 | * back. | |
1168 | */ | |
1169 | int sdw_bus_exit_clk_stop(struct sdw_bus *bus) | |
1170 | { | |
0231453b RW |
1171 | bool simple_clk_stop = true; |
1172 | struct sdw_slave *slave; | |
1173 | bool is_slave = false; | |
1174 | int ret; | |
1175 | ||
1176 | /* | |
1177 | * In order to save on transition time, de-prepare | |
1178 | * each Slave and then wait for all Slave(s) to be | |
1179 | * de-prepared after clock resume. | |
1180 | */ | |
1181 | list_for_each_entry(slave, &bus->slaves, node) { | |
1182 | if (!slave->dev_num) | |
1183 | continue; | |
1184 | ||
0231453b RW |
1185 | if (slave->status != SDW_SLAVE_ATTACHED && |
1186 | slave->status != SDW_SLAVE_ALERT) | |
1187 | continue; | |
1188 | ||
929cfee3 BL |
1189 | /* Identify if Slave(s) are available on Bus */ |
1190 | is_slave = true; | |
1191 | ||
345e9f5c | 1192 | ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0, |
0231453b RW |
1193 | SDW_CLK_PRE_DEPREPARE); |
1194 | if (ret < 0) | |
b50bb8ba | 1195 | dev_warn(&slave->dev, "clock stop pre-deprepare cb failed:%d\n", ret); |
0231453b | 1196 | |
345e9f5c PLB |
1197 | /* Only de-prepare a Slave device if needed */ |
1198 | if (!slave->prop.simple_clk_stop_capable) { | |
1199 | simple_clk_stop = false; | |
0231453b | 1200 | |
345e9f5c PLB |
1201 | ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0, |
1202 | false); | |
0231453b | 1203 | |
345e9f5c | 1204 | if (ret < 0) |
b50bb8ba | 1205 | dev_warn(&slave->dev, "clock stop deprepare failed:%d\n", ret); |
345e9f5c | 1206 | } |
0231453b RW |
1207 | } |
1208 | ||
18de2f72 | 1209 | /* Skip remaining clock stop de-preparation if no Slave is attached */ |
929cfee3 BL |
1210 | if (!is_slave) |
1211 | return 0; | |
1212 | ||
345e9f5c PLB |
1213 | /* |
1214 | * Don't wait for all Slaves to be ready if they follow the simple | |
1215 | * state machine | |
1216 | */ | |
b50bb8ba PLB |
1217 | if (!simple_clk_stop) { |
1218 | ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); | |
1219 | if (ret < 0) | |
4cbbe74d | 1220 | dev_warn(bus->dev, "clock stop deprepare wait failed:%d\n", ret); |
b50bb8ba | 1221 | } |
18de2f72 | 1222 | |
0231453b RW |
1223 | list_for_each_entry(slave, &bus->slaves, node) { |
1224 | if (!slave->dev_num) | |
1225 | continue; | |
1226 | ||
1227 | if (slave->status != SDW_SLAVE_ATTACHED && | |
1228 | slave->status != SDW_SLAVE_ALERT) | |
1229 | continue; | |
1230 | ||
b50bb8ba PLB |
1231 | ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0, |
1232 | SDW_CLK_POST_DEPREPARE); | |
1233 | if (ret < 0) | |
1234 | dev_warn(&slave->dev, "clock stop post-deprepare cb failed:%d\n", ret); | |
0231453b RW |
1235 | } |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | EXPORT_SYMBOL(sdw_bus_exit_clk_stop); | |
1240 | ||
79df15b7 | 1241 | int sdw_configure_dpn_intr(struct sdw_slave *slave, |
73ede046 | 1242 | int port, bool enable, int mask) |
79df15b7 SK |
1243 | { |
1244 | u32 addr; | |
1245 | int ret; | |
1246 | u8 val = 0; | |
1247 | ||
dd87a72a PLB |
1248 | if (slave->bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL) { |
1249 | dev_dbg(&slave->dev, "TEST FAIL interrupt %s\n", | |
1250 | enable ? "on" : "off"); | |
1251 | mask |= SDW_DPN_INT_TEST_FAIL; | |
1252 | } | |
1253 | ||
79df15b7 SK |
1254 | addr = SDW_DPN_INTMASK(port); |
1255 | ||
1256 | /* Set/Clear port ready interrupt mask */ | |
1257 | if (enable) { | |
1258 | val |= mask; | |
1259 | val |= SDW_DPN_INT_PORT_READY; | |
1260 | } else { | |
1261 | val &= ~(mask); | |
1262 | val &= ~SDW_DPN_INT_PORT_READY; | |
1263 | } | |
1264 | ||
545c3651 | 1265 | ret = sdw_update_no_pm(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val); |
79df15b7 | 1266 | if (ret < 0) |
6d7a1ff7 | 1267 | dev_err(&slave->dev, |
17ed5bef | 1268 | "SDW_DPN_INTMASK write failed:%d\n", val); |
79df15b7 SK |
1269 | |
1270 | return ret; | |
1271 | } | |
1272 | ||
29d158f9 PLB |
1273 | static int sdw_slave_set_frequency(struct sdw_slave *slave) |
1274 | { | |
1275 | u32 mclk_freq = slave->bus->prop.mclk_freq; | |
1276 | u32 curr_freq = slave->bus->params.curr_dr_freq >> 1; | |
1277 | unsigned int scale; | |
1278 | u8 scale_index; | |
1279 | u8 base; | |
1280 | int ret; | |
1281 | ||
1282 | /* | |
1283 | * frequency base and scale registers are required for SDCA | |
ffa17265 PLB |
1284 | * devices. They may also be used for 1.2+/non-SDCA devices. |
1285 | * Driver can set the property, we will need a DisCo property | |
1286 | * to discover this case from platform firmware. | |
29d158f9 | 1287 | */ |
ffa17265 | 1288 | if (!slave->id.class_id && !slave->prop.clock_reg_supported) |
29d158f9 PLB |
1289 | return 0; |
1290 | ||
1291 | if (!mclk_freq) { | |
1292 | dev_err(&slave->dev, | |
1293 | "no bus MCLK, cannot set SDW_SCP_BUS_CLOCK_BASE\n"); | |
1294 | return -EINVAL; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * map base frequency using Table 89 of SoundWire 1.2 spec. | |
1299 | * The order of the tests just follows the specification, this | |
1300 | * is not a selection between possible values or a search for | |
1301 | * the best value but just a mapping. Only one case per platform | |
1302 | * is relevant. | |
1303 | * Some BIOS have inconsistent values for mclk_freq but a | |
1304 | * correct root so we force the mclk_freq to avoid variations. | |
1305 | */ | |
1306 | if (!(19200000 % mclk_freq)) { | |
1307 | mclk_freq = 19200000; | |
1308 | base = SDW_SCP_BASE_CLOCK_19200000_HZ; | |
1309 | } else if (!(24000000 % mclk_freq)) { | |
1310 | mclk_freq = 24000000; | |
1311 | base = SDW_SCP_BASE_CLOCK_24000000_HZ; | |
1312 | } else if (!(24576000 % mclk_freq)) { | |
1313 | mclk_freq = 24576000; | |
1314 | base = SDW_SCP_BASE_CLOCK_24576000_HZ; | |
1315 | } else if (!(22579200 % mclk_freq)) { | |
1316 | mclk_freq = 22579200; | |
1317 | base = SDW_SCP_BASE_CLOCK_22579200_HZ; | |
1318 | } else if (!(32000000 % mclk_freq)) { | |
1319 | mclk_freq = 32000000; | |
1320 | base = SDW_SCP_BASE_CLOCK_32000000_HZ; | |
1321 | } else { | |
1322 | dev_err(&slave->dev, | |
1323 | "Unsupported clock base, mclk %d\n", | |
1324 | mclk_freq); | |
1325 | return -EINVAL; | |
1326 | } | |
1327 | ||
1328 | if (mclk_freq % curr_freq) { | |
1329 | dev_err(&slave->dev, | |
1330 | "mclk %d is not multiple of bus curr_freq %d\n", | |
1331 | mclk_freq, curr_freq); | |
1332 | return -EINVAL; | |
1333 | } | |
1334 | ||
1335 | scale = mclk_freq / curr_freq; | |
1336 | ||
1337 | /* | |
1338 | * map scale to Table 90 of SoundWire 1.2 spec - and check | |
1339 | * that the scale is a power of two and maximum 64 | |
1340 | */ | |
1341 | scale_index = ilog2(scale); | |
1342 | ||
1343 | if (BIT(scale_index) != scale || scale_index > 6) { | |
1344 | dev_err(&slave->dev, | |
1345 | "No match found for scale %d, bus mclk %d curr_freq %d\n", | |
1346 | scale, mclk_freq, curr_freq); | |
1347 | return -EINVAL; | |
1348 | } | |
1349 | scale_index++; | |
1350 | ||
299e9780 | 1351 | ret = sdw_write_no_pm(slave, SDW_SCP_BUS_CLOCK_BASE, base); |
29d158f9 PLB |
1352 | if (ret < 0) { |
1353 | dev_err(&slave->dev, | |
1354 | "SDW_SCP_BUS_CLOCK_BASE write failed:%d\n", ret); | |
1355 | return ret; | |
1356 | } | |
1357 | ||
1358 | /* initialize scale for both banks */ | |
299e9780 | 1359 | ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B0, scale_index); |
29d158f9 PLB |
1360 | if (ret < 0) { |
1361 | dev_err(&slave->dev, | |
1362 | "SDW_SCP_BUSCLOCK_SCALE_B0 write failed:%d\n", ret); | |
1363 | return ret; | |
1364 | } | |
299e9780 | 1365 | ret = sdw_write_no_pm(slave, SDW_SCP_BUSCLOCK_SCALE_B1, scale_index); |
29d158f9 PLB |
1366 | if (ret < 0) |
1367 | dev_err(&slave->dev, | |
1368 | "SDW_SCP_BUSCLOCK_SCALE_B1 write failed:%d\n", ret); | |
1369 | ||
1370 | dev_dbg(&slave->dev, | |
1371 | "Configured bus base %d, scale %d, mclk %d, curr_freq %d\n", | |
1372 | base, scale_index, mclk_freq, curr_freq); | |
1373 | ||
1374 | return ret; | |
1375 | } | |
1376 | ||
d52d7a1b SK |
1377 | static int sdw_initialize_slave(struct sdw_slave *slave) |
1378 | { | |
1379 | struct sdw_slave_prop *prop = &slave->prop; | |
6b8caa6f | 1380 | int status; |
d52d7a1b SK |
1381 | int ret; |
1382 | u8 val; | |
1383 | ||
29d158f9 PLB |
1384 | ret = sdw_slave_set_frequency(slave); |
1385 | if (ret < 0) | |
1386 | return ret; | |
1387 | ||
6b8caa6f BL |
1388 | if (slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_CLASH) { |
1389 | /* Clear bus clash interrupt before enabling interrupt mask */ | |
1390 | status = sdw_read_no_pm(slave, SDW_SCP_INT1); | |
1391 | if (status < 0) { | |
1392 | dev_err(&slave->dev, | |
1393 | "SDW_SCP_INT1 (BUS_CLASH) read failed:%d\n", status); | |
1394 | return status; | |
1395 | } | |
1396 | if (status & SDW_SCP_INT1_BUS_CLASH) { | |
1397 | dev_warn(&slave->dev, "Bus clash detected before INT mask is enabled\n"); | |
1398 | ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_BUS_CLASH); | |
1399 | if (ret < 0) { | |
1400 | dev_err(&slave->dev, | |
1401 | "SDW_SCP_INT1 (BUS_CLASH) write failed:%d\n", ret); | |
1402 | return ret; | |
1403 | } | |
1404 | } | |
1405 | } | |
1406 | if ((slave->bus->prop.quirks & SDW_MASTER_QUIRKS_CLEAR_INITIAL_PARITY) && | |
1407 | !(slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY)) { | |
1408 | /* Clear parity interrupt before enabling interrupt mask */ | |
1409 | status = sdw_read_no_pm(slave, SDW_SCP_INT1); | |
1410 | if (status < 0) { | |
1411 | dev_err(&slave->dev, | |
1412 | "SDW_SCP_INT1 (PARITY) read failed:%d\n", status); | |
1413 | return status; | |
1414 | } | |
1415 | if (status & SDW_SCP_INT1_PARITY) { | |
1416 | dev_warn(&slave->dev, "PARITY error detected before INT mask is enabled\n"); | |
1417 | ret = sdw_write_no_pm(slave, SDW_SCP_INT1, SDW_SCP_INT1_PARITY); | |
1418 | if (ret < 0) { | |
1419 | dev_err(&slave->dev, | |
1420 | "SDW_SCP_INT1 (PARITY) write failed:%d\n", ret); | |
1421 | return ret; | |
1422 | } | |
1423 | } | |
1424 | } | |
1425 | ||
d52d7a1b | 1426 | /* |
2acd30b9 PLB |
1427 | * Set SCP_INT1_MASK register, typically bus clash and |
1428 | * implementation-defined interrupt mask. The Parity detection | |
1429 | * may not always be correct on startup so its use is | |
1430 | * device-dependent, it might e.g. only be enabled in | |
1431 | * steady-state after a couple of frames. | |
d52d7a1b | 1432 | */ |
2acd30b9 | 1433 | val = slave->prop.scp_int1_mask; |
d52d7a1b SK |
1434 | |
1435 | /* Enable SCP interrupts */ | |
b04c975e | 1436 | ret = sdw_update_no_pm(slave, SDW_SCP_INTMASK1, val, val); |
d52d7a1b | 1437 | if (ret < 0) { |
6d7a1ff7 | 1438 | dev_err(&slave->dev, |
17ed5bef | 1439 | "SDW_SCP_INTMASK1 write failed:%d\n", ret); |
d52d7a1b SK |
1440 | return ret; |
1441 | } | |
1442 | ||
1443 | /* No need to continue if DP0 is not present */ | |
1444 | if (!slave->prop.dp0_prop) | |
1445 | return 0; | |
1446 | ||
1447 | /* Enable DP0 interrupts */ | |
8acbbfec | 1448 | val = prop->dp0_prop->imp_def_interrupts; |
d52d7a1b SK |
1449 | val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE; |
1450 | ||
b04c975e | 1451 | ret = sdw_update_no_pm(slave, SDW_DP0_INTMASK, val, val); |
5de79ba8 | 1452 | if (ret < 0) |
6d7a1ff7 | 1453 | dev_err(&slave->dev, |
17ed5bef | 1454 | "SDW_DP0_INTMASK read failed:%d\n", ret); |
5de79ba8 | 1455 | return ret; |
d52d7a1b | 1456 | } |
b0a9c37b VK |
1457 | |
1458 | static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status) | |
1459 | { | |
b35991de | 1460 | u8 clear, impl_int_mask; |
b0a9c37b VK |
1461 | int status, status2, ret, count = 0; |
1462 | ||
c30b63ef | 1463 | status = sdw_read_no_pm(slave, SDW_DP0_INT); |
b0a9c37b | 1464 | if (status < 0) { |
6d7a1ff7 | 1465 | dev_err(&slave->dev, |
17ed5bef | 1466 | "SDW_DP0_INT read failed:%d\n", status); |
b0a9c37b VK |
1467 | return status; |
1468 | } | |
1469 | ||
1470 | do { | |
b35991de PLB |
1471 | clear = status & ~SDW_DP0_INTERRUPTS; |
1472 | ||
b0a9c37b | 1473 | if (status & SDW_DP0_INT_TEST_FAIL) { |
17ed5bef | 1474 | dev_err(&slave->dev, "Test fail for port 0\n"); |
b0a9c37b VK |
1475 | clear |= SDW_DP0_INT_TEST_FAIL; |
1476 | } | |
1477 | ||
1478 | /* | |
1479 | * Assumption: PORT_READY interrupt will be received only for | |
1480 | * ports implementing Channel Prepare state machine (CP_SM) | |
1481 | */ | |
1482 | ||
1483 | if (status & SDW_DP0_INT_PORT_READY) { | |
1484 | complete(&slave->port_ready[0]); | |
1485 | clear |= SDW_DP0_INT_PORT_READY; | |
1486 | } | |
1487 | ||
1488 | if (status & SDW_DP0_INT_BRA_FAILURE) { | |
17ed5bef | 1489 | dev_err(&slave->dev, "BRA failed\n"); |
b0a9c37b VK |
1490 | clear |= SDW_DP0_INT_BRA_FAILURE; |
1491 | } | |
1492 | ||
1493 | impl_int_mask = SDW_DP0_INT_IMPDEF1 | | |
1494 | SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3; | |
1495 | ||
1496 | if (status & impl_int_mask) { | |
1497 | clear |= impl_int_mask; | |
1498 | *slave_status = clear; | |
1499 | } | |
1500 | ||
b35991de | 1501 | /* clear the interrupts but don't touch reserved and SDCA_CASCADE fields */ |
c30b63ef | 1502 | ret = sdw_write_no_pm(slave, SDW_DP0_INT, clear); |
b0a9c37b | 1503 | if (ret < 0) { |
6d7a1ff7 | 1504 | dev_err(&slave->dev, |
17ed5bef | 1505 | "SDW_DP0_INT write failed:%d\n", ret); |
b0a9c37b VK |
1506 | return ret; |
1507 | } | |
1508 | ||
1509 | /* Read DP0 interrupt again */ | |
c30b63ef | 1510 | status2 = sdw_read_no_pm(slave, SDW_DP0_INT); |
b0a9c37b | 1511 | if (status2 < 0) { |
6d7a1ff7 | 1512 | dev_err(&slave->dev, |
17ed5bef | 1513 | "SDW_DP0_INT read failed:%d\n", status2); |
80cd8f01 | 1514 | return status2; |
b0a9c37b | 1515 | } |
6e06a855 | 1516 | /* filter to limit loop to interrupts identified in the first status read */ |
b0a9c37b VK |
1517 | status &= status2; |
1518 | ||
1519 | count++; | |
1520 | ||
1521 | /* we can get alerts while processing so keep retrying */ | |
b35991de | 1522 | } while ((status & SDW_DP0_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY)); |
b0a9c37b VK |
1523 | |
1524 | if (count == SDW_READ_INTR_CLEAR_RETRY) | |
6d7a1ff7 | 1525 | dev_warn(&slave->dev, "Reached MAX_RETRY on DP0 read\n"); |
b0a9c37b VK |
1526 | |
1527 | return ret; | |
1528 | } | |
1529 | ||
1530 | static int sdw_handle_port_interrupt(struct sdw_slave *slave, | |
73ede046 | 1531 | int port, u8 *slave_status) |
b0a9c37b | 1532 | { |
47b85209 | 1533 | u8 clear, impl_int_mask; |
b0a9c37b VK |
1534 | int status, status2, ret, count = 0; |
1535 | u32 addr; | |
1536 | ||
1537 | if (port == 0) | |
1538 | return sdw_handle_dp0_interrupt(slave, slave_status); | |
1539 | ||
1540 | addr = SDW_DPN_INT(port); | |
c30b63ef | 1541 | status = sdw_read_no_pm(slave, addr); |
b0a9c37b | 1542 | if (status < 0) { |
6d7a1ff7 | 1543 | dev_err(&slave->dev, |
17ed5bef | 1544 | "SDW_DPN_INT read failed:%d\n", status); |
b0a9c37b VK |
1545 | |
1546 | return status; | |
1547 | } | |
1548 | ||
1549 | do { | |
47b85209 PLB |
1550 | clear = status & ~SDW_DPN_INTERRUPTS; |
1551 | ||
b0a9c37b | 1552 | if (status & SDW_DPN_INT_TEST_FAIL) { |
17ed5bef | 1553 | dev_err(&slave->dev, "Test fail for port:%d\n", port); |
b0a9c37b VK |
1554 | clear |= SDW_DPN_INT_TEST_FAIL; |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * Assumption: PORT_READY interrupt will be received only | |
1559 | * for ports implementing CP_SM. | |
1560 | */ | |
1561 | if (status & SDW_DPN_INT_PORT_READY) { | |
1562 | complete(&slave->port_ready[port]); | |
1563 | clear |= SDW_DPN_INT_PORT_READY; | |
1564 | } | |
1565 | ||
1566 | impl_int_mask = SDW_DPN_INT_IMPDEF1 | | |
1567 | SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3; | |
1568 | ||
b0a9c37b VK |
1569 | if (status & impl_int_mask) { |
1570 | clear |= impl_int_mask; | |
1571 | *slave_status = clear; | |
1572 | } | |
1573 | ||
47b85209 | 1574 | /* clear the interrupt but don't touch reserved fields */ |
c30b63ef | 1575 | ret = sdw_write_no_pm(slave, addr, clear); |
b0a9c37b | 1576 | if (ret < 0) { |
6d7a1ff7 | 1577 | dev_err(&slave->dev, |
17ed5bef | 1578 | "SDW_DPN_INT write failed:%d\n", ret); |
b0a9c37b VK |
1579 | return ret; |
1580 | } | |
1581 | ||
1582 | /* Read DPN interrupt again */ | |
c30b63ef | 1583 | status2 = sdw_read_no_pm(slave, addr); |
80cd8f01 | 1584 | if (status2 < 0) { |
6d7a1ff7 | 1585 | dev_err(&slave->dev, |
17ed5bef | 1586 | "SDW_DPN_INT read failed:%d\n", status2); |
80cd8f01 | 1587 | return status2; |
b0a9c37b | 1588 | } |
6e06a855 | 1589 | /* filter to limit loop to interrupts identified in the first status read */ |
b0a9c37b VK |
1590 | status &= status2; |
1591 | ||
1592 | count++; | |
1593 | ||
1594 | /* we can get alerts while processing so keep retrying */ | |
47b85209 | 1595 | } while ((status & SDW_DPN_INTERRUPTS) && (count < SDW_READ_INTR_CLEAR_RETRY)); |
b0a9c37b VK |
1596 | |
1597 | if (count == SDW_READ_INTR_CLEAR_RETRY) | |
6d7a1ff7 | 1598 | dev_warn(&slave->dev, "Reached MAX_RETRY on port read"); |
b0a9c37b VK |
1599 | |
1600 | return ret; | |
1601 | } | |
1602 | ||
1603 | static int sdw_handle_slave_alerts(struct sdw_slave *slave) | |
1604 | { | |
1605 | struct sdw_slave_intr_status slave_intr; | |
f1fac63a | 1606 | u8 clear = 0, bit, port_status[15] = {0}; |
b0a9c37b VK |
1607 | int port_num, stat, ret, count = 0; |
1608 | unsigned long port; | |
7ffaba04 | 1609 | bool slave_notify; |
b7cab9be | 1610 | u8 sdca_cascade = 0; |
9420c971 | 1611 | u8 buf, buf2[2]; |
4724f12c PLB |
1612 | bool parity_check; |
1613 | bool parity_quirk; | |
b0a9c37b VK |
1614 | |
1615 | sdw_modify_slave_status(slave, SDW_SLAVE_ALERT); | |
1616 | ||
e9537962 | 1617 | ret = pm_runtime_get_sync(&slave->dev); |
aa792935 RW |
1618 | if (ret < 0 && ret != -EACCES) { |
1619 | dev_err(&slave->dev, "Failed to resume device: %d\n", ret); | |
e9537962 | 1620 | pm_runtime_put_noidle(&slave->dev); |
aa792935 RW |
1621 | return ret; |
1622 | } | |
1623 | ||
f8d0168e | 1624 | /* Read Intstat 1, Intstat 2 and Intstat 3 registers */ |
c30b63ef | 1625 | ret = sdw_read_no_pm(slave, SDW_SCP_INT1); |
b0a9c37b | 1626 | if (ret < 0) { |
6d7a1ff7 | 1627 | dev_err(&slave->dev, |
17ed5bef | 1628 | "SDW_SCP_INT1 read failed:%d\n", ret); |
aa792935 | 1629 | goto io_err; |
b0a9c37b | 1630 | } |
72b16d4a | 1631 | buf = ret; |
b0a9c37b | 1632 | |
c30b63ef | 1633 | ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2); |
b0a9c37b | 1634 | if (ret < 0) { |
6d7a1ff7 | 1635 | dev_err(&slave->dev, |
17ed5bef | 1636 | "SDW_SCP_INT2/3 read failed:%d\n", ret); |
aa792935 | 1637 | goto io_err; |
b0a9c37b VK |
1638 | } |
1639 | ||
be505ba8 | 1640 | if (slave->id.class_id) { |
c30b63ef | 1641 | ret = sdw_read_no_pm(slave, SDW_DP0_INT); |
b7cab9be | 1642 | if (ret < 0) { |
6d7a1ff7 | 1643 | dev_err(&slave->dev, |
b7cab9be PLB |
1644 | "SDW_DP0_INT read failed:%d\n", ret); |
1645 | goto io_err; | |
1646 | } | |
1647 | sdca_cascade = ret & SDW_DP0_SDCA_CASCADE; | |
1648 | } | |
1649 | ||
b0a9c37b | 1650 | do { |
7ffaba04 PLB |
1651 | slave_notify = false; |
1652 | ||
b0a9c37b VK |
1653 | /* |
1654 | * Check parity, bus clash and Slave (impl defined) | |
1655 | * interrupt | |
1656 | */ | |
1657 | if (buf & SDW_SCP_INT1_PARITY) { | |
4724f12c PLB |
1658 | parity_check = slave->prop.scp_int1_mask & SDW_SCP_INT1_PARITY; |
1659 | parity_quirk = !slave->first_interrupt_done && | |
1660 | (slave->prop.quirks & SDW_SLAVE_QUIRKS_INVALID_INITIAL_PARITY); | |
1661 | ||
1662 | if (parity_check && !parity_quirk) | |
310f6dc6 | 1663 | dev_err(&slave->dev, "Parity error detected\n"); |
b0a9c37b VK |
1664 | clear |= SDW_SCP_INT1_PARITY; |
1665 | } | |
1666 | ||
1667 | if (buf & SDW_SCP_INT1_BUS_CLASH) { | |
310f6dc6 PLB |
1668 | if (slave->prop.scp_int1_mask & SDW_SCP_INT1_BUS_CLASH) |
1669 | dev_err(&slave->dev, "Bus clash detected\n"); | |
b0a9c37b VK |
1670 | clear |= SDW_SCP_INT1_BUS_CLASH; |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * When bus clash or parity errors are detected, such errors | |
1675 | * are unlikely to be recoverable errors. | |
1676 | * TODO: In such scenario, reset bus. Make this configurable | |
1677 | * via sysfs property with bus reset being the default. | |
1678 | */ | |
1679 | ||
1680 | if (buf & SDW_SCP_INT1_IMPL_DEF) { | |
310f6dc6 PLB |
1681 | if (slave->prop.scp_int1_mask & SDW_SCP_INT1_IMPL_DEF) { |
1682 | dev_dbg(&slave->dev, "Slave impl defined interrupt\n"); | |
1683 | slave_notify = true; | |
1684 | } | |
b0a9c37b | 1685 | clear |= SDW_SCP_INT1_IMPL_DEF; |
b0a9c37b VK |
1686 | } |
1687 | ||
b7cab9be PLB |
1688 | /* the SDCA interrupts are cleared in the codec driver .interrupt_callback() */ |
1689 | if (sdca_cascade) | |
1690 | slave_notify = true; | |
1691 | ||
b0a9c37b VK |
1692 | /* Check port 0 - 3 interrupts */ |
1693 | port = buf & SDW_SCP_INT1_PORT0_3; | |
1694 | ||
1695 | /* To get port number corresponding to bits, shift it */ | |
d5826a4b | 1696 | port = FIELD_GET(SDW_SCP_INT1_PORT0_3, port); |
b0a9c37b VK |
1697 | for_each_set_bit(bit, &port, 8) { |
1698 | sdw_handle_port_interrupt(slave, bit, | |
73ede046 | 1699 | &port_status[bit]); |
b0a9c37b VK |
1700 | } |
1701 | ||
1702 | /* Check if cascade 2 interrupt is present */ | |
1703 | if (buf & SDW_SCP_INT1_SCP2_CASCADE) { | |
1704 | port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10; | |
1705 | for_each_set_bit(bit, &port, 8) { | |
1706 | /* scp2 ports start from 4 */ | |
560458df | 1707 | port_num = bit + 4; |
b0a9c37b VK |
1708 | sdw_handle_port_interrupt(slave, |
1709 | port_num, | |
1710 | &port_status[port_num]); | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | /* now check last cascade */ | |
1715 | if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) { | |
1716 | port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14; | |
1717 | for_each_set_bit(bit, &port, 8) { | |
1718 | /* scp3 ports start from 11 */ | |
560458df | 1719 | port_num = bit + 11; |
b0a9c37b VK |
1720 | sdw_handle_port_interrupt(slave, |
1721 | port_num, | |
1722 | &port_status[port_num]); | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | /* Update the Slave driver */ | |
bd29c00e PLB |
1727 | if (slave_notify) { |
1728 | mutex_lock(&slave->sdw_dev_lock); | |
1729 | ||
1730 | if (slave->probed) { | |
1731 | struct device *dev = &slave->dev; | |
1732 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
1733 | ||
12a95123 LT |
1734 | if (slave->prop.use_domain_irq && slave->irq) |
1735 | handle_nested_irq(slave->irq); | |
1736 | ||
bd29c00e PLB |
1737 | if (drv->ops && drv->ops->interrupt_callback) { |
1738 | slave_intr.sdca_cascade = sdca_cascade; | |
1739 | slave_intr.control_port = clear; | |
1740 | memcpy(slave_intr.port, &port_status, | |
1741 | sizeof(slave_intr.port)); | |
1742 | ||
1743 | drv->ops->interrupt_callback(slave, &slave_intr); | |
1744 | } | |
1745 | } | |
1746 | ||
1747 | mutex_unlock(&slave->sdw_dev_lock); | |
b0a9c37b VK |
1748 | } |
1749 | ||
1750 | /* Ack interrupt */ | |
c30b63ef | 1751 | ret = sdw_write_no_pm(slave, SDW_SCP_INT1, clear); |
b0a9c37b | 1752 | if (ret < 0) { |
6d7a1ff7 | 1753 | dev_err(&slave->dev, |
17ed5bef | 1754 | "SDW_SCP_INT1 write failed:%d\n", ret); |
aa792935 | 1755 | goto io_err; |
b0a9c37b VK |
1756 | } |
1757 | ||
c2819e19 PLB |
1758 | /* at this point all initial interrupt sources were handled */ |
1759 | slave->first_interrupt_done = true; | |
1760 | ||
b0a9c37b VK |
1761 | /* |
1762 | * Read status again to ensure no new interrupts arrived | |
1763 | * while servicing interrupts. | |
1764 | */ | |
c30b63ef | 1765 | ret = sdw_read_no_pm(slave, SDW_SCP_INT1); |
b0a9c37b | 1766 | if (ret < 0) { |
6d7a1ff7 | 1767 | dev_err(&slave->dev, |
b500127e | 1768 | "SDW_SCP_INT1 recheck read failed:%d\n", ret); |
aa792935 | 1769 | goto io_err; |
b0a9c37b | 1770 | } |
9420c971 | 1771 | buf = ret; |
b0a9c37b | 1772 | |
9420c971 | 1773 | ret = sdw_nread_no_pm(slave, SDW_SCP_INTSTAT2, 2, buf2); |
b0a9c37b | 1774 | if (ret < 0) { |
6d7a1ff7 | 1775 | dev_err(&slave->dev, |
b500127e | 1776 | "SDW_SCP_INT2/3 recheck read failed:%d\n", ret); |
aa792935 | 1777 | goto io_err; |
b0a9c37b VK |
1778 | } |
1779 | ||
be505ba8 | 1780 | if (slave->id.class_id) { |
c30b63ef | 1781 | ret = sdw_read_no_pm(slave, SDW_DP0_INT); |
b7cab9be | 1782 | if (ret < 0) { |
6d7a1ff7 | 1783 | dev_err(&slave->dev, |
b500127e | 1784 | "SDW_DP0_INT recheck read failed:%d\n", ret); |
b7cab9be PLB |
1785 | goto io_err; |
1786 | } | |
1787 | sdca_cascade = ret & SDW_DP0_SDCA_CASCADE; | |
1788 | } | |
1789 | ||
6e06a855 | 1790 | /* |
9420c971 | 1791 | * Make sure no interrupts are pending |
6e06a855 | 1792 | */ |
b7cab9be | 1793 | stat = buf || buf2[0] || buf2[1] || sdca_cascade; |
b0a9c37b VK |
1794 | |
1795 | /* | |
1796 | * Exit loop if Slave is continuously in ALERT state even | |
1797 | * after servicing the interrupt multiple times. | |
1798 | */ | |
1799 | count++; | |
1800 | ||
1801 | /* we can get alerts while processing so keep retrying */ | |
1802 | } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY); | |
1803 | ||
1804 | if (count == SDW_READ_INTR_CLEAR_RETRY) | |
6d7a1ff7 | 1805 | dev_warn(&slave->dev, "Reached MAX_RETRY on alert read\n"); |
b0a9c37b | 1806 | |
aa792935 RW |
1807 | io_err: |
1808 | pm_runtime_mark_last_busy(&slave->dev); | |
1809 | pm_runtime_put_autosuspend(&slave->dev); | |
1810 | ||
b0a9c37b VK |
1811 | return ret; |
1812 | } | |
1813 | ||
1814 | static int sdw_update_slave_status(struct sdw_slave *slave, | |
73ede046 | 1815 | enum sdw_slave_status status) |
b0a9c37b | 1816 | { |
bd29c00e | 1817 | int ret = 0; |
b0a9c37b | 1818 | |
bd29c00e PLB |
1819 | mutex_lock(&slave->sdw_dev_lock); |
1820 | ||
1821 | if (slave->probed) { | |
1822 | struct device *dev = &slave->dev; | |
1823 | struct sdw_driver *drv = drv_to_sdw_driver(dev->driver); | |
1824 | ||
1825 | if (drv->ops && drv->ops->update_status) | |
1826 | ret = drv->ops->update_status(slave, status); | |
2140b66b PLB |
1827 | } |
1828 | ||
bd29c00e | 1829 | mutex_unlock(&slave->sdw_dev_lock); |
2140b66b | 1830 | |
bd29c00e | 1831 | return ret; |
b0a9c37b VK |
1832 | } |
1833 | ||
1834 | /** | |
1835 | * sdw_handle_slave_status() - Handle Slave status | |
1836 | * @bus: SDW bus instance | |
1837 | * @status: Status for all Slave(s) | |
1838 | */ | |
1839 | int sdw_handle_slave_status(struct sdw_bus *bus, | |
73ede046 | 1840 | enum sdw_slave_status status[]) |
b0a9c37b VK |
1841 | { |
1842 | enum sdw_slave_status prev_status; | |
1843 | struct sdw_slave *slave; | |
72124f07 | 1844 | bool attached_initializing, id_programmed; |
b0a9c37b VK |
1845 | int i, ret = 0; |
1846 | ||
61061901 PLB |
1847 | /* first check if any Slaves fell off the bus */ |
1848 | for (i = 1; i <= SDW_MAX_DEVICES; i++) { | |
1849 | mutex_lock(&bus->bus_lock); | |
1850 | if (test_bit(i, bus->assigned) == false) { | |
1851 | mutex_unlock(&bus->bus_lock); | |
1852 | continue; | |
1853 | } | |
1854 | mutex_unlock(&bus->bus_lock); | |
1855 | ||
1856 | slave = sdw_get_slave(bus, i); | |
1857 | if (!slave) | |
1858 | continue; | |
1859 | ||
1860 | if (status[i] == SDW_SLAVE_UNATTACHED && | |
d1b32855 PLB |
1861 | slave->status != SDW_SLAVE_UNATTACHED) { |
1862 | dev_warn(&slave->dev, "Slave %d state check1: UNATTACHED, status was %d\n", | |
1863 | i, slave->status); | |
61061901 | 1864 | sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); |
f605f32e RF |
1865 | |
1866 | /* Ensure driver knows that peripheral unattached */ | |
1867 | ret = sdw_update_slave_status(slave, status[i]); | |
1868 | if (ret < 0) | |
1869 | dev_warn(&slave->dev, "Update Slave status failed:%d\n", ret); | |
d1b32855 | 1870 | } |
61061901 PLB |
1871 | } |
1872 | ||
b0a9c37b | 1873 | if (status[0] == SDW_SLAVE_ATTACHED) { |
6e0ac6a6 | 1874 | dev_dbg(bus->dev, "Slave attached, programming device number\n"); |
72124f07 | 1875 | |
15ed3ea2 | 1876 | /* |
72124f07 RF |
1877 | * Programming a device number will have side effects, |
1878 | * so we deal with other devices at a later time. | |
1879 | * This relies on those devices reporting ATTACHED, which will | |
1880 | * trigger another call to this function. This will only | |
1881 | * happen if at least one device ID was programmed. | |
1882 | * Error returns from sdw_program_device_num() are currently | |
1883 | * ignored because there's no useful recovery that can be done. | |
1884 | * Returning the error here could result in the current status | |
1885 | * of other devices not being handled, because if no device IDs | |
1886 | * were programmed there's nothing to guarantee a status change | |
1887 | * to trigger another call to this function. | |
15ed3ea2 | 1888 | */ |
72124f07 RF |
1889 | sdw_program_device_num(bus, &id_programmed); |
1890 | if (id_programmed) | |
1891 | return 0; | |
b0a9c37b VK |
1892 | } |
1893 | ||
1894 | /* Continue to check other slave statuses */ | |
1895 | for (i = 1; i <= SDW_MAX_DEVICES; i++) { | |
1896 | mutex_lock(&bus->bus_lock); | |
1897 | if (test_bit(i, bus->assigned) == false) { | |
1898 | mutex_unlock(&bus->bus_lock); | |
1899 | continue; | |
1900 | } | |
1901 | mutex_unlock(&bus->bus_lock); | |
1902 | ||
1903 | slave = sdw_get_slave(bus, i); | |
1904 | if (!slave) | |
1905 | continue; | |
1906 | ||
a90def06 PLB |
1907 | attached_initializing = false; |
1908 | ||
b0a9c37b VK |
1909 | switch (status[i]) { |
1910 | case SDW_SLAVE_UNATTACHED: | |
1911 | if (slave->status == SDW_SLAVE_UNATTACHED) | |
1912 | break; | |
1913 | ||
d1b32855 PLB |
1914 | dev_warn(&slave->dev, "Slave %d state check2: UNATTACHED, status was %d\n", |
1915 | i, slave->status); | |
1916 | ||
b0a9c37b VK |
1917 | sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); |
1918 | break; | |
1919 | ||
1920 | case SDW_SLAVE_ALERT: | |
1921 | ret = sdw_handle_slave_alerts(slave); | |
a5759f19 | 1922 | if (ret < 0) |
6d7a1ff7 | 1923 | dev_err(&slave->dev, |
17ed5bef | 1924 | "Slave %d alert handling failed: %d\n", |
b0a9c37b VK |
1925 | i, ret); |
1926 | break; | |
1927 | ||
1928 | case SDW_SLAVE_ATTACHED: | |
1929 | if (slave->status == SDW_SLAVE_ATTACHED) | |
1930 | break; | |
1931 | ||
1932 | prev_status = slave->status; | |
1933 | sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED); | |
1934 | ||
1935 | if (prev_status == SDW_SLAVE_ALERT) | |
1936 | break; | |
1937 | ||
a90def06 PLB |
1938 | attached_initializing = true; |
1939 | ||
b0a9c37b | 1940 | ret = sdw_initialize_slave(slave); |
a5759f19 | 1941 | if (ret < 0) |
6d7a1ff7 | 1942 | dev_err(&slave->dev, |
17ed5bef | 1943 | "Slave %d initialization failed: %d\n", |
b0a9c37b VK |
1944 | i, ret); |
1945 | ||
1946 | break; | |
1947 | ||
1948 | default: | |
6d7a1ff7 | 1949 | dev_err(&slave->dev, "Invalid slave %d status:%d\n", |
73ede046 | 1950 | i, status[i]); |
b0a9c37b VK |
1951 | break; |
1952 | } | |
1953 | ||
1954 | ret = sdw_update_slave_status(slave, status[i]); | |
a5759f19 | 1955 | if (ret < 0) |
6d7a1ff7 | 1956 | dev_err(&slave->dev, |
17ed5bef | 1957 | "Update Slave status failed:%d\n", ret); |
f1b69026 PLB |
1958 | if (attached_initializing) { |
1959 | dev_dbg(&slave->dev, | |
9af8c36a PLB |
1960 | "signaling initialization completion for Slave %d\n", |
1961 | slave->dev_num); | |
f1b69026 | 1962 | |
c40d6b32 | 1963 | complete_all(&slave->initialization_complete); |
e557bca4 PLB |
1964 | |
1965 | /* | |
1966 | * If the manager became pm_runtime active, the peripherals will be | |
1967 | * restarted and attach, but their pm_runtime status may remain | |
1968 | * suspended. If the 'update_slave_status' callback initiates | |
1969 | * any sort of deferred processing, this processing would not be | |
1970 | * cancelled on pm_runtime suspend. | |
1971 | * To avoid such zombie states, we queue a request to resume. | |
1972 | * This would be a no-op in case the peripheral was being resumed | |
1973 | * by e.g. the ALSA/ASoC framework. | |
1974 | */ | |
1975 | pm_request_resume(&slave->dev); | |
f1b69026 | 1976 | } |
b0a9c37b VK |
1977 | } |
1978 | ||
1979 | return ret; | |
1980 | } | |
1981 | EXPORT_SYMBOL(sdw_handle_slave_status); | |
3ab2ca40 PLB |
1982 | |
1983 | void sdw_clear_slave_status(struct sdw_bus *bus, u32 request) | |
1984 | { | |
1985 | struct sdw_slave *slave; | |
1986 | int i; | |
1987 | ||
1988 | /* Check all non-zero devices */ | |
1989 | for (i = 1; i <= SDW_MAX_DEVICES; i++) { | |
1990 | mutex_lock(&bus->bus_lock); | |
1991 | if (test_bit(i, bus->assigned) == false) { | |
1992 | mutex_unlock(&bus->bus_lock); | |
1993 | continue; | |
1994 | } | |
1995 | mutex_unlock(&bus->bus_lock); | |
1996 | ||
1997 | slave = sdw_get_slave(bus, i); | |
1998 | if (!slave) | |
1999 | continue; | |
2000 | ||
c2819e19 | 2001 | if (slave->status != SDW_SLAVE_UNATTACHED) { |
3ab2ca40 | 2002 | sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); |
c2819e19 | 2003 | slave->first_interrupt_done = false; |
899a7509 | 2004 | sdw_update_slave_status(slave, SDW_SLAVE_UNATTACHED); |
c2819e19 | 2005 | } |
3ab2ca40 PLB |
2006 | |
2007 | /* keep track of request, used in pm_runtime resume */ | |
2008 | slave->unattach_request = request; | |
2009 | } | |
2010 | } | |
2011 | EXPORT_SYMBOL(sdw_clear_slave_status); |