1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * USB4 specific functionality
4 *
5 * Copyright (C) 2019, Intel Corporation
6 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
7 * Rajmohan Mani <rajmohan.mani@intel.com>
8 */
9
10 #include <linux/delay.h>
11 #include <linux/ktime.h>
12 #include <linux/units.h>
13
14 #include "sb_regs.h"
15 #include "tb.h"
16
17 #define USB4_DATA_RETRIES 3
18 #define USB4_DATA_DWORDS 16
19
20 enum usb4_sb_target {
21 USB4_SB_TARGET_ROUTER,
22 USB4_SB_TARGET_PARTNER,
23 USB4_SB_TARGET_RETIMER,
24 };
25
26 #define USB4_NVM_READ_OFFSET_MASK GENMASK(23, 2)
27 #define USB4_NVM_READ_OFFSET_SHIFT 2
28 #define USB4_NVM_READ_LENGTH_MASK GENMASK(27, 24)
29 #define USB4_NVM_READ_LENGTH_SHIFT 24
30
31 #define USB4_NVM_SET_OFFSET_MASK USB4_NVM_READ_OFFSET_MASK
32 #define USB4_NVM_SET_OFFSET_SHIFT USB4_NVM_READ_OFFSET_SHIFT
33
34 #define USB4_DROM_ADDRESS_MASK GENMASK(14, 2)
35 #define USB4_DROM_ADDRESS_SHIFT 2
36 #define USB4_DROM_SIZE_MASK GENMASK(19, 15)
37 #define USB4_DROM_SIZE_SHIFT 15
38
39 #define USB4_NVM_SECTOR_SIZE_MASK GENMASK(23, 0)
40
41 #define USB4_BA_LENGTH_MASK GENMASK(7, 0)
42 #define USB4_BA_INDEX_MASK GENMASK(15, 0)
43
44 enum usb4_ba_index {
45 USB4_BA_MAX_USB3 = 0x1,
46 USB4_BA_MIN_DP_AUX = 0x2,
47 USB4_BA_MIN_DP_MAIN = 0x3,
48 USB4_BA_MAX_PCIE = 0x4,
49 USB4_BA_MAX_HI = 0x5,
50 };
51
52 #define USB4_BA_VALUE_MASK GENMASK(31, 16)
53 #define USB4_BA_VALUE_SHIFT 16
54
usb4_native_switch_op(struct tb_switch * sw,u16 opcode,u32 * metadata,u8 * status,const void * tx_data,size_t tx_dwords,void * rx_data,size_t rx_dwords)55 static int usb4_native_switch_op(struct tb_switch *sw, u16 opcode,
56 u32 *metadata, u8 *status,
57 const void *tx_data, size_t tx_dwords,
58 void *rx_data, size_t rx_dwords)
59 {
60 u32 val;
61 int ret;
62
63 if (metadata) {
64 ret = tb_sw_write(sw, metadata, TB_CFG_SWITCH, ROUTER_CS_25, 1);
65 if (ret)
66 return ret;
67 }
68 if (tx_dwords) {
69 ret = tb_sw_write(sw, tx_data, TB_CFG_SWITCH, ROUTER_CS_9,
70 tx_dwords);
71 if (ret)
72 return ret;
73 }
74
75 val = opcode | ROUTER_CS_26_OV;
76 ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
77 if (ret)
78 return ret;
79
80 ret = tb_switch_wait_for_bit(sw, ROUTER_CS_26, ROUTER_CS_26_OV, 0, 500);
81 if (ret)
82 return ret;
83
84 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
85 if (ret)
86 return ret;
87
88 if (val & ROUTER_CS_26_ONS)
89 return -EOPNOTSUPP;
90
91 if (status)
92 *status = (val & ROUTER_CS_26_STATUS_MASK) >>
93 ROUTER_CS_26_STATUS_SHIFT;
94
95 if (metadata) {
96 ret = tb_sw_read(sw, metadata, TB_CFG_SWITCH, ROUTER_CS_25, 1);
97 if (ret)
98 return ret;
99 }
100 if (rx_dwords) {
101 ret = tb_sw_read(sw, rx_data, TB_CFG_SWITCH, ROUTER_CS_9,
102 rx_dwords);
103 if (ret)
104 return ret;
105 }
106
107 return 0;
108 }
109
__usb4_switch_op(struct tb_switch * sw,u16 opcode,u32 * metadata,u8 * status,const void * tx_data,size_t tx_dwords,void * rx_data,size_t rx_dwords)110 static int __usb4_switch_op(struct tb_switch *sw, u16 opcode, u32 *metadata,
111 u8 *status, const void *tx_data, size_t tx_dwords,
112 void *rx_data, size_t rx_dwords)
113 {
114 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
115
116 if (tx_dwords > USB4_DATA_DWORDS || rx_dwords > USB4_DATA_DWORDS)
117 return -EINVAL;
118
119 /*
120 * If the connection manager implementation provides USB4 router
121 * operation proxy callback, call it here instead of running the
122 * operation natively.
123 */
124 if (cm_ops->usb4_switch_op) {
125 int ret;
126
127 ret = cm_ops->usb4_switch_op(sw, opcode, metadata, status,
128 tx_data, tx_dwords, rx_data,
129 rx_dwords);
130 if (ret != -EOPNOTSUPP)
131 return ret;
132
133 /*
134 * If the proxy was not supported then run the native
135 * router operation instead.
136 */
137 }
138
139 return usb4_native_switch_op(sw, opcode, metadata, status, tx_data,
140 tx_dwords, rx_data, rx_dwords);
141 }
142
usb4_switch_op(struct tb_switch * sw,u16 opcode,u32 * metadata,u8 * status)143 static inline int usb4_switch_op(struct tb_switch *sw, u16 opcode,
144 u32 *metadata, u8 *status)
145 {
146 return __usb4_switch_op(sw, opcode, metadata, status, NULL, 0, NULL, 0);
147 }
148
usb4_switch_op_data(struct tb_switch * sw,u16 opcode,u32 * metadata,u8 * status,const void * tx_data,size_t tx_dwords,void * rx_data,size_t rx_dwords)149 static inline int usb4_switch_op_data(struct tb_switch *sw, u16 opcode,
150 u32 *metadata, u8 *status,
151 const void *tx_data, size_t tx_dwords,
152 void *rx_data, size_t rx_dwords)
153 {
154 return __usb4_switch_op(sw, opcode, metadata, status, tx_data,
155 tx_dwords, rx_data, rx_dwords);
156 }
157
158 /**
159 * usb4_switch_check_wakes() - Check for wakes and notify PM core about them
160 * @sw: Router whose wakes to check
161 *
162 * Checks wakes occurred during suspend and notify the PM core about them.
163 */
usb4_switch_check_wakes(struct tb_switch * sw)164 void usb4_switch_check_wakes(struct tb_switch *sw)
165 {
166 bool wakeup_usb4 = false;
167 struct usb4_port *usb4;
168 struct tb_port *port;
169 bool wakeup = false;
170 u32 val;
171
172 if (tb_route(sw)) {
173 if (tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_6, 1))
174 return;
175
176 tb_sw_dbg(sw, "PCIe wake: %s, USB3 wake: %s\n",
177 (val & ROUTER_CS_6_WOPS) ? "yes" : "no",
178 (val & ROUTER_CS_6_WOUS) ? "yes" : "no");
179
180 wakeup = val & (ROUTER_CS_6_WOPS | ROUTER_CS_6_WOUS);
181 }
182
183 /*
184 * Check for any downstream ports for USB4 wake,
185 * connection wake and disconnection wake.
186 */
187 tb_switch_for_each_port(sw, port) {
188 if (!port->cap_usb4)
189 continue;
190
191 if (tb_port_read(port, &val, TB_CFG_PORT,
192 port->cap_usb4 + PORT_CS_18, 1))
193 break;
194
195 tb_port_dbg(port, "USB4 wake: %s, connection wake: %s, disconnection wake: %s\n",
196 (val & PORT_CS_18_WOU4S) ? "yes" : "no",
197 (val & PORT_CS_18_WOCS) ? "yes" : "no",
198 (val & PORT_CS_18_WODS) ? "yes" : "no");
199
200 wakeup_usb4 = val & (PORT_CS_18_WOU4S | PORT_CS_18_WOCS |
201 PORT_CS_18_WODS);
202
203 usb4 = port->usb4;
204 if (device_may_wakeup(&usb4->dev) && wakeup_usb4)
205 pm_wakeup_event(&usb4->dev, 0);
206
207 wakeup |= wakeup_usb4;
208 }
209
210 if (wakeup)
211 pm_wakeup_event(&sw->dev, 0);
212 }
213
link_is_usb4(struct tb_port * port)214 static bool link_is_usb4(struct tb_port *port)
215 {
216 u32 val;
217
218 if (!port->cap_usb4)
219 return false;
220
221 if (tb_port_read(port, &val, TB_CFG_PORT,
222 port->cap_usb4 + PORT_CS_18, 1))
223 return false;
224
225 return !(val & PORT_CS_18_TCM);
226 }
227
228 /**
229 * usb4_switch_setup() - Additional setup for USB4 device
230 * @sw: USB4 router to setup
231 *
232 * USB4 routers need additional settings in order to enable all the
233 * tunneling. This function enables USB and PCIe tunneling if it can be
234 * enabled (e.g the parent switch also supports them). If USB tunneling
235 * is not available for some reason (like that there is Thunderbolt 3
236 * switch upstream) then the internal xHCI controller is enabled
237 * instead.
238 *
239 * This does not set the configuration valid bit of the router. To do
240 * that call usb4_switch_configuration_valid().
241 */
usb4_switch_setup(struct tb_switch * sw)242 int usb4_switch_setup(struct tb_switch *sw)
243 {
244 struct tb_switch *parent = tb_switch_parent(sw);
245 struct tb_port *down;
246 bool tbt3, xhci;
247 u32 val = 0;
248 int ret;
249
250 if (!tb_route(sw))
251 return 0;
252
253 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_6, 1);
254 if (ret)
255 return ret;
256
257 down = tb_switch_downstream_port(sw);
258 sw->link_usb4 = link_is_usb4(down);
259 tb_sw_dbg(sw, "link: %s\n", sw->link_usb4 ? "USB4" : "TBT");
260
261 xhci = val & ROUTER_CS_6_HCI;
262 tbt3 = !(val & ROUTER_CS_6_TNS);
263
264 tb_sw_dbg(sw, "TBT3 support: %s, xHCI: %s\n",
265 tbt3 ? "yes" : "no", xhci ? "yes" : "no");
266
267 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
268 if (ret)
269 return ret;
270
271 if (tb_acpi_may_tunnel_usb3() && sw->link_usb4 &&
272 tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
273 val |= ROUTER_CS_5_UTO;
274 xhci = false;
275 }
276
277 /*
278 * Only enable PCIe tunneling if the parent router supports it
279 * and it is not disabled.
280 */
281 if (tb_acpi_may_tunnel_pcie() &&
282 tb_switch_find_port(parent, TB_TYPE_PCIE_DOWN)) {
283 val |= ROUTER_CS_5_PTO;
284 /*
285 * xHCI can be enabled if PCIe tunneling is supported
286 * and the parent does not have any USB3 dowstream
287 * adapters (so we cannot do USB 3.x tunneling).
288 */
289 if (xhci)
290 val |= ROUTER_CS_5_HCO;
291 }
292
293 /* TBT3 supported by the CM */
294 val &= ~ROUTER_CS_5_CNS;
295
296 return tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
297 }
298
299 /**
300 * usb4_switch_configuration_valid() - Set tunneling configuration to be valid
301 * @sw: USB4 router
302 *
303 * Sets configuration valid bit for the router. Must be called before
304 * any tunnels can be set through the router and after
305 * usb4_switch_setup() has been called. Can be called to host and device
306 * routers (does nothing for the latter).
307 *
308 * Returns %0 in success and negative errno otherwise.
309 */
usb4_switch_configuration_valid(struct tb_switch * sw)310 int usb4_switch_configuration_valid(struct tb_switch *sw)
311 {
312 u32 val;
313 int ret;
314
315 if (!tb_route(sw))
316 return 0;
317
318 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
319 if (ret)
320 return ret;
321
322 val |= ROUTER_CS_5_CV;
323
324 ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
325 if (ret)
326 return ret;
327
328 return tb_switch_wait_for_bit(sw, ROUTER_CS_6, ROUTER_CS_6_CR,
329 ROUTER_CS_6_CR, 50);
330 }
331
332 /**
333 * usb4_switch_read_uid() - Read UID from USB4 router
334 * @sw: USB4 router
335 * @uid: UID is stored here
336 *
337 * Reads 64-bit UID from USB4 router config space.
338 */
usb4_switch_read_uid(struct tb_switch * sw,u64 * uid)339 int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid)
340 {
341 return tb_sw_read(sw, uid, TB_CFG_SWITCH, ROUTER_CS_7, 2);
342 }
343
usb4_switch_drom_read_block(void * data,unsigned int dwaddress,void * buf,size_t dwords)344 static int usb4_switch_drom_read_block(void *data,
345 unsigned int dwaddress, void *buf,
346 size_t dwords)
347 {
348 struct tb_switch *sw = data;
349 u8 status = 0;
350 u32 metadata;
351 int ret;
352
353 metadata = (dwords << USB4_DROM_SIZE_SHIFT) & USB4_DROM_SIZE_MASK;
354 metadata |= (dwaddress << USB4_DROM_ADDRESS_SHIFT) &
355 USB4_DROM_ADDRESS_MASK;
356
357 ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_DROM_READ, &metadata,
358 &status, NULL, 0, buf, dwords);
359 if (ret)
360 return ret;
361
362 return status ? -EIO : 0;
363 }
364
365 /**
366 * usb4_switch_drom_read() - Read arbitrary bytes from USB4 router DROM
367 * @sw: USB4 router
368 * @address: Byte address inside DROM to start reading
369 * @buf: Buffer where the DROM content is stored
370 * @size: Number of bytes to read from DROM
371 *
372 * Uses USB4 router operations to read router DROM. For devices this
373 * should always work but for hosts it may return %-EOPNOTSUPP in which
374 * case the host router does not have DROM.
375 */
usb4_switch_drom_read(struct tb_switch * sw,unsigned int address,void * buf,size_t size)376 int usb4_switch_drom_read(struct tb_switch *sw, unsigned int address, void *buf,
377 size_t size)
378 {
379 return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
380 usb4_switch_drom_read_block, sw);
381 }
382
383 /**
384 * usb4_switch_lane_bonding_possible() - Are conditions met for lane bonding
385 * @sw: USB4 router
386 *
387 * Checks whether conditions are met so that lane bonding can be
388 * established with the upstream router. Call only for device routers.
389 */
usb4_switch_lane_bonding_possible(struct tb_switch * sw)390 bool usb4_switch_lane_bonding_possible(struct tb_switch *sw)
391 {
392 struct tb_port *up;
393 int ret;
394 u32 val;
395
396 up = tb_upstream_port(sw);
397 ret = tb_port_read(up, &val, TB_CFG_PORT, up->cap_usb4 + PORT_CS_18, 1);
398 if (ret)
399 return false;
400
401 return !!(val & PORT_CS_18_BE);
402 }
403
404 /**
405 * usb4_switch_set_wake() - Enabled/disable wake
406 * @sw: USB4 router
407 * @flags: Wakeup flags (%0 to disable)
408 *
409 * Enables/disables router to wake up from sleep.
410 */
usb4_switch_set_wake(struct tb_switch * sw,unsigned int flags)411 int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags)
412 {
413 struct usb4_port *usb4;
414 struct tb_port *port;
415 u64 route = tb_route(sw);
416 u32 val;
417 int ret;
418
419 /*
420 * Enable wakes coming from all USB4 downstream ports (from
421 * child routers). For device routers do this also for the
422 * upstream USB4 port.
423 */
424 tb_switch_for_each_port(sw, port) {
425 if (!tb_port_is_null(port))
426 continue;
427 if (!route && tb_is_upstream_port(port))
428 continue;
429 if (!port->cap_usb4)
430 continue;
431
432 ret = tb_port_read(port, &val, TB_CFG_PORT,
433 port->cap_usb4 + PORT_CS_19, 1);
434 if (ret)
435 return ret;
436
437 val &= ~(PORT_CS_19_WOC | PORT_CS_19_WOD | PORT_CS_19_WOU4);
438
439 if (tb_is_upstream_port(port)) {
440 val |= PORT_CS_19_WOU4;
441 } else {
442 bool configured = val & PORT_CS_19_PC;
443 usb4 = port->usb4;
444
445 if (((flags & TB_WAKE_ON_CONNECT) |
446 device_may_wakeup(&usb4->dev)) && !configured)
447 val |= PORT_CS_19_WOC;
448 if (((flags & TB_WAKE_ON_DISCONNECT) |
449 device_may_wakeup(&usb4->dev)) && configured)
450 val |= PORT_CS_19_WOD;
451 if ((flags & TB_WAKE_ON_USB4) && configured)
452 val |= PORT_CS_19_WOU4;
453 }
454
455 ret = tb_port_write(port, &val, TB_CFG_PORT,
456 port->cap_usb4 + PORT_CS_19, 1);
457 if (ret)
458 return ret;
459 }
460
461 /*
462 * Enable wakes from PCIe, USB 3.x and DP on this router. Only
463 * needed for device routers.
464 */
465 if (route) {
466 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
467 if (ret)
468 return ret;
469
470 val &= ~(ROUTER_CS_5_WOP | ROUTER_CS_5_WOU | ROUTER_CS_5_WOD);
471 if (flags & TB_WAKE_ON_USB3)
472 val |= ROUTER_CS_5_WOU;
473 if (flags & TB_WAKE_ON_PCIE)
474 val |= ROUTER_CS_5_WOP;
475 if (flags & TB_WAKE_ON_DP)
476 val |= ROUTER_CS_5_WOD;
477
478 ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
479 if (ret)
480 return ret;
481 }
482
483 return 0;
484 }
485
486 /**
487 * usb4_switch_set_sleep() - Prepare the router to enter sleep
488 * @sw: USB4 router
489 *
490 * Sets sleep bit for the router. Returns when the router sleep ready
491 * bit has been asserted.
492 */
usb4_switch_set_sleep(struct tb_switch * sw)493 int usb4_switch_set_sleep(struct tb_switch *sw)
494 {
495 int ret;
496 u32 val;
497
498 /* Set sleep bit and wait for sleep ready to be asserted */
499 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
500 if (ret)
501 return ret;
502
503 val |= ROUTER_CS_5_SLP;
504
505 ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
506 if (ret)
507 return ret;
508
509 return tb_switch_wait_for_bit(sw, ROUTER_CS_6, ROUTER_CS_6_SLPR,
510 ROUTER_CS_6_SLPR, 500);
511 }
512
513 /**
514 * usb4_switch_nvm_sector_size() - Return router NVM sector size
515 * @sw: USB4 router
516 *
517 * If the router supports NVM operations this function returns the NVM
518 * sector size in bytes. If NVM operations are not supported returns
519 * %-EOPNOTSUPP.
520 */
usb4_switch_nvm_sector_size(struct tb_switch * sw)521 int usb4_switch_nvm_sector_size(struct tb_switch *sw)
522 {
523 u32 metadata;
524 u8 status;
525 int ret;
526
527 ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_SECTOR_SIZE, &metadata,
528 &status);
529 if (ret)
530 return ret;
531
532 if (status)
533 return status == 0x2 ? -EOPNOTSUPP : -EIO;
534
535 return metadata & USB4_NVM_SECTOR_SIZE_MASK;
536 }
537
usb4_switch_nvm_read_block(void * data,unsigned int dwaddress,void * buf,size_t dwords)538 static int usb4_switch_nvm_read_block(void *data,
539 unsigned int dwaddress, void *buf, size_t dwords)
540 {
541 struct tb_switch *sw = data;
542 u8 status = 0;
543 u32 metadata;
544 int ret;
545
546 metadata = (dwords << USB4_NVM_READ_LENGTH_SHIFT) &
547 USB4_NVM_READ_LENGTH_MASK;
548 metadata |= (dwaddress << USB4_NVM_READ_OFFSET_SHIFT) &
549 USB4_NVM_READ_OFFSET_MASK;
550
551 ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_NVM_READ, &metadata,
552 &status, NULL, 0, buf, dwords);
553 if (ret)
554 return ret;
555
556 return status ? -EIO : 0;
557 }
558
559 /**
560 * usb4_switch_nvm_read() - Read arbitrary bytes from router NVM
561 * @sw: USB4 router
562 * @address: Starting address in bytes
563 * @buf: Read data is placed here
564 * @size: How many bytes to read
565 *
566 * Reads NVM contents of the router. If NVM is not supported returns
567 * %-EOPNOTSUPP.
568 */
usb4_switch_nvm_read(struct tb_switch * sw,unsigned int address,void * buf,size_t size)569 int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
570 size_t size)
571 {
572 return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
573 usb4_switch_nvm_read_block, sw);
574 }
575
576 /**
577 * usb4_switch_nvm_set_offset() - Set NVM write offset
578 * @sw: USB4 router
579 * @address: Start offset
580 *
581 * Explicitly sets NVM write offset. Normally when writing to NVM this
582 * is done automatically by usb4_switch_nvm_write().
583 *
584 * Returns %0 in success and negative errno if there was a failure.
585 */
usb4_switch_nvm_set_offset(struct tb_switch * sw,unsigned int address)586 int usb4_switch_nvm_set_offset(struct tb_switch *sw, unsigned int address)
587 {
588 u32 metadata, dwaddress;
589 u8 status = 0;
590 int ret;
591
592 dwaddress = address / 4;
593 metadata = (dwaddress << USB4_NVM_SET_OFFSET_SHIFT) &
594 USB4_NVM_SET_OFFSET_MASK;
595
596 ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_SET_OFFSET, &metadata,
597 &status);
598 if (ret)
599 return ret;
600
601 return status ? -EIO : 0;
602 }
603
usb4_switch_nvm_write_next_block(void * data,unsigned int dwaddress,const void * buf,size_t dwords)604 static int usb4_switch_nvm_write_next_block(void *data, unsigned int dwaddress,
605 const void *buf, size_t dwords)
606 {
607 struct tb_switch *sw = data;
608 u8 status;
609 int ret;
610
611 ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_NVM_WRITE, NULL, &status,
612 buf, dwords, NULL, 0);
613 if (ret)
614 return ret;
615
616 return status ? -EIO : 0;
617 }
618
619 /**
620 * usb4_switch_nvm_write() - Write to the router NVM
621 * @sw: USB4 router
622 * @address: Start address where to write in bytes
623 * @buf: Pointer to the data to write
624 * @size: Size of @buf in bytes
625 *
626 * Writes @buf to the router NVM using USB4 router operations. If NVM
627 * write is not supported returns %-EOPNOTSUPP.
628 */
usb4_switch_nvm_write(struct tb_switch * sw,unsigned int address,const void * buf,size_t size)629 int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address,
630 const void *buf, size_t size)
631 {
632 int ret;
633
634 ret = usb4_switch_nvm_set_offset(sw, address);
635 if (ret)
636 return ret;
637
638 return tb_nvm_write_data(address, buf, size, USB4_DATA_RETRIES,
639 usb4_switch_nvm_write_next_block, sw);
640 }
641
642 /**
643 * usb4_switch_nvm_authenticate() - Authenticate new NVM
644 * @sw: USB4 router
645 *
646 * After the new NVM has been written via usb4_switch_nvm_write(), this
647 * function triggers NVM authentication process. The router gets power
648 * cycled and if the authentication is successful the new NVM starts
649 * running. In case of failure returns negative errno.
650 *
651 * The caller should call usb4_switch_nvm_authenticate_status() to read
652 * the status of the authentication after power cycle. It should be the
653 * first router operation to avoid the status being lost.
654 */
usb4_switch_nvm_authenticate(struct tb_switch * sw)655 int usb4_switch_nvm_authenticate(struct tb_switch *sw)
656 {
657 int ret;
658
659 ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_AUTH, NULL, NULL);
660 switch (ret) {
661 /*
662 * The router is power cycled once NVM_AUTH is started so it is
663 * expected to get any of the following errors back.
664 */
665 case -EACCES:
666 case -ENOTCONN:
667 case -ETIMEDOUT:
668 return 0;
669
670 default:
671 return ret;
672 }
673 }
674
675 /**
676 * usb4_switch_nvm_authenticate_status() - Read status of last NVM authenticate
677 * @sw: USB4 router
678 * @status: Status code of the operation
679 *
680 * The function checks if there is status available from the last NVM
681 * authenticate router operation. If there is status then %0 is returned
682 * and the status code is placed in @status. Returns negative errno in case
683 * of failure.
684 *
685 * Must be called before any other router operation.
686 */
usb4_switch_nvm_authenticate_status(struct tb_switch * sw,u32 * status)687 int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status)
688 {
689 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
690 u16 opcode;
691 u32 val;
692 int ret;
693
694 if (cm_ops->usb4_switch_nvm_authenticate_status) {
695 ret = cm_ops->usb4_switch_nvm_authenticate_status(sw, status);
696 if (ret != -EOPNOTSUPP)
697 return ret;
698 }
699
700 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
701 if (ret)
702 return ret;
703
704 /* Check that the opcode is correct */
705 opcode = val & ROUTER_CS_26_OPCODE_MASK;
706 if (opcode == USB4_SWITCH_OP_NVM_AUTH) {
707 if (val & ROUTER_CS_26_OV)
708 return -EBUSY;
709 if (val & ROUTER_CS_26_ONS)
710 return -EOPNOTSUPP;
711
712 *status = (val & ROUTER_CS_26_STATUS_MASK) >>
713 ROUTER_CS_26_STATUS_SHIFT;
714 } else {
715 *status = 0;
716 }
717
718 return 0;
719 }
720
721 /**
722 * usb4_switch_credits_init() - Read buffer allocation parameters
723 * @sw: USB4 router
724 *
725 * Reads @sw buffer allocation parameters and initializes @sw buffer
726 * allocation fields accordingly. Specifically @sw->credits_allocation
727 * is set to %true if these parameters can be used in tunneling.
728 *
729 * Returns %0 on success and negative errno otherwise.
730 */
usb4_switch_credits_init(struct tb_switch * sw)731 int usb4_switch_credits_init(struct tb_switch *sw)
732 {
733 int max_usb3, min_dp_aux, min_dp_main, max_pcie, max_dma;
734 int ret, length, i, nports;
735 const struct tb_port *port;
736 u32 data[USB4_DATA_DWORDS];
737 u32 metadata = 0;
738 u8 status = 0;
739
740 memset(data, 0, sizeof(data));
741 ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_BUFFER_ALLOC, &metadata,
742 &status, NULL, 0, data, ARRAY_SIZE(data));
743 if (ret)
744 return ret;
745 if (status)
746 return -EIO;
747
748 length = metadata & USB4_BA_LENGTH_MASK;
749 if (WARN_ON(length > ARRAY_SIZE(data)))
750 return -EMSGSIZE;
751
752 max_usb3 = -1;
753 min_dp_aux = -1;
754 min_dp_main = -1;
755 max_pcie = -1;
756 max_dma = -1;
757
758 tb_sw_dbg(sw, "credit allocation parameters:\n");
759
760 for (i = 0; i < length; i++) {
761 u16 index, value;
762
763 index = data[i] & USB4_BA_INDEX_MASK;
764 value = (data[i] & USB4_BA_VALUE_MASK) >> USB4_BA_VALUE_SHIFT;
765
766 switch (index) {
767 case USB4_BA_MAX_USB3:
768 tb_sw_dbg(sw, " USB3: %u\n", value);
769 max_usb3 = value;
770 break;
771 case USB4_BA_MIN_DP_AUX:
772 tb_sw_dbg(sw, " DP AUX: %u\n", value);
773 min_dp_aux = value;
774 break;
775 case USB4_BA_MIN_DP_MAIN:
776 tb_sw_dbg(sw, " DP main: %u\n", value);
777 min_dp_main = value;
778 break;
779 case USB4_BA_MAX_PCIE:
780 tb_sw_dbg(sw, " PCIe: %u\n", value);
781 max_pcie = value;
782 break;
783 case USB4_BA_MAX_HI:
784 tb_sw_dbg(sw, " DMA: %u\n", value);
785 max_dma = value;
786 break;
787 default:
788 tb_sw_dbg(sw, " unknown credit allocation index %#x, skipping\n",
789 index);
790 break;
791 }
792 }
793
794 /*
795 * Validate the buffer allocation preferences. If we find
796 * issues, log a warning and fall back using the hard-coded
797 * values.
798 */
799
800 /* Host router must report baMaxHI */
801 if (!tb_route(sw) && max_dma < 0) {
802 tb_sw_warn(sw, "host router is missing baMaxHI\n");
803 goto err_invalid;
804 }
805
806 nports = 0;
807 tb_switch_for_each_port(sw, port) {
808 if (tb_port_is_null(port))
809 nports++;
810 }
811
812 /* Must have DP buffer allocation (multiple USB4 ports) */
813 if (nports > 2 && (min_dp_aux < 0 || min_dp_main < 0)) {
814 tb_sw_warn(sw, "multiple USB4 ports require baMinDPaux/baMinDPmain\n");
815 goto err_invalid;
816 }
817
818 tb_switch_for_each_port(sw, port) {
819 if (tb_port_is_dpout(port) && min_dp_main < 0) {
820 tb_sw_warn(sw, "missing baMinDPmain");
821 goto err_invalid;
822 }
823 if ((tb_port_is_dpin(port) || tb_port_is_dpout(port)) &&
824 min_dp_aux < 0) {
825 tb_sw_warn(sw, "missing baMinDPaux");
826 goto err_invalid;
827 }
828 if ((tb_port_is_usb3_down(port) || tb_port_is_usb3_up(port)) &&
829 max_usb3 < 0) {
830 tb_sw_warn(sw, "missing baMaxUSB3");
831 goto err_invalid;
832 }
833 if ((tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) &&
834 max_pcie < 0) {
835 tb_sw_warn(sw, "missing baMaxPCIe");
836 goto err_invalid;
837 }
838 }
839
840 /*
841 * Buffer allocation passed the validation so we can use it in
842 * path creation.
843 */
844 sw->credit_allocation = true;
845 if (max_usb3 > 0)
846 sw->max_usb3_credits = max_usb3;
847 if (min_dp_aux > 0)
848 sw->min_dp_aux_credits = min_dp_aux;
849 if (min_dp_main > 0)
850 sw->min_dp_main_credits = min_dp_main;
851 if (max_pcie > 0)
852 sw->max_pcie_credits = max_pcie;
853 if (max_dma > 0)
854 sw->max_dma_credits = max_dma;
855
856 return 0;
857
858 err_invalid:
859 return -EINVAL;
860 }
861
862 /**
863 * usb4_switch_query_dp_resource() - Query availability of DP IN resource
864 * @sw: USB4 router
865 * @in: DP IN adapter
866 *
867 * For DP tunneling this function can be used to query availability of
868 * DP IN resource. Returns true if the resource is available for DP
869 * tunneling, false otherwise.
870 */
usb4_switch_query_dp_resource(struct tb_switch * sw,struct tb_port * in)871 bool usb4_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
872 {
873 u32 metadata = in->port;
874 u8 status;
875 int ret;
876
877 ret = usb4_switch_op(sw, USB4_SWITCH_OP_QUERY_DP_RESOURCE, &metadata,
878 &status);
879 /*
880 * If DP resource allocation is not supported assume it is
881 * always available.
882 */
883 if (ret == -EOPNOTSUPP)
884 return true;
885 if (ret)
886 return false;
887
888 return !status;
889 }
890
891 /**
892 * usb4_switch_alloc_dp_resource() - Allocate DP IN resource
893 * @sw: USB4 router
894 * @in: DP IN adapter
895 *
896 * Allocates DP IN resource for DP tunneling using USB4 router
897 * operations. If the resource was allocated returns %0. Otherwise
898 * returns negative errno, in particular %-EBUSY if the resource is
899 * already allocated.
900 */
usb4_switch_alloc_dp_resource(struct tb_switch * sw,struct tb_port * in)901 int usb4_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
902 {
903 u32 metadata = in->port;
904 u8 status;
905 int ret;
906
907 ret = usb4_switch_op(sw, USB4_SWITCH_OP_ALLOC_DP_RESOURCE, &metadata,
908 &status);
909 if (ret == -EOPNOTSUPP)
910 return 0;
911 if (ret)
912 return ret;
913
914 return status ? -EBUSY : 0;
915 }
916
917 /**
918 * usb4_switch_dealloc_dp_resource() - Releases allocated DP IN resource
919 * @sw: USB4 router
920 * @in: DP IN adapter
921 *
922 * Releases the previously allocated DP IN resource.
923 */
usb4_switch_dealloc_dp_resource(struct tb_switch * sw,struct tb_port * in)924 int usb4_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
925 {
926 u32 metadata = in->port;
927 u8 status;
928 int ret;
929
930 ret = usb4_switch_op(sw, USB4_SWITCH_OP_DEALLOC_DP_RESOURCE, &metadata,
931 &status);
932 if (ret == -EOPNOTSUPP)
933 return 0;
934 if (ret)
935 return ret;
936
937 return status ? -EIO : 0;
938 }
939
usb4_port_idx(const struct tb_switch * sw,const struct tb_port * port)940 static int usb4_port_idx(const struct tb_switch *sw, const struct tb_port *port)
941 {
942 struct tb_port *p;
943 int usb4_idx = 0;
944
945 /* Assume port is primary */
946 tb_switch_for_each_port(sw, p) {
947 if (!tb_port_is_null(p))
948 continue;
949 if (tb_is_upstream_port(p))
950 continue;
951 if (!p->link_nr) {
952 if (p == port)
953 break;
954 usb4_idx++;
955 }
956 }
957
958 return usb4_idx;
959 }
960
961 /**
962 * usb4_switch_map_pcie_down() - Map USB4 port to a PCIe downstream adapter
963 * @sw: USB4 router
964 * @port: USB4 port
965 *
966 * USB4 routers have direct mapping between USB4 ports and PCIe
967 * downstream adapters where the PCIe topology is extended. This
968 * function returns the corresponding downstream PCIe adapter or %NULL
969 * if no such mapping was possible.
970 */
usb4_switch_map_pcie_down(struct tb_switch * sw,const struct tb_port * port)971 struct tb_port *usb4_switch_map_pcie_down(struct tb_switch *sw,
972 const struct tb_port *port)
973 {
974 int usb4_idx = usb4_port_idx(sw, port);
975 struct tb_port *p;
976 int pcie_idx = 0;
977
978 /* Find PCIe down port matching usb4_port */
979 tb_switch_for_each_port(sw, p) {
980 if (!tb_port_is_pcie_down(p))
981 continue;
982
983 if (pcie_idx == usb4_idx)
984 return p;
985
986 pcie_idx++;
987 }
988
989 return NULL;
990 }
991
992 /**
993 * usb4_switch_map_usb3_down() - Map USB4 port to a USB3 downstream adapter
994 * @sw: USB4 router
995 * @port: USB4 port
996 *
997 * USB4 routers have direct mapping between USB4 ports and USB 3.x
998 * downstream adapters where the USB 3.x topology is extended. This
999 * function returns the corresponding downstream USB 3.x adapter or
1000 * %NULL if no such mapping was possible.
1001 */
usb4_switch_map_usb3_down(struct tb_switch * sw,const struct tb_port * port)1002 struct tb_port *usb4_switch_map_usb3_down(struct tb_switch *sw,
1003 const struct tb_port *port)
1004 {
1005 int usb4_idx = usb4_port_idx(sw, port);
1006 struct tb_port *p;
1007 int usb_idx = 0;
1008
1009 /* Find USB3 down port matching usb4_port */
1010 tb_switch_for_each_port(sw, p) {
1011 if (!tb_port_is_usb3_down(p))
1012 continue;
1013
1014 if (usb_idx == usb4_idx)
1015 return p;
1016
1017 usb_idx++;
1018 }
1019
1020 return NULL;
1021 }
1022
1023 /**
1024 * usb4_switch_add_ports() - Add USB4 ports for this router
1025 * @sw: USB4 router
1026 *
1027 * For USB4 router finds all USB4 ports and registers devices for each.
1028 * Can be called to any router.
1029 *
1030 * Return %0 in case of success and negative errno in case of failure.
1031 */
usb4_switch_add_ports(struct tb_switch * sw)1032 int usb4_switch_add_ports(struct tb_switch *sw)
1033 {
1034 struct tb_port *port;
1035
1036 if (tb_switch_is_icm(sw) || !tb_switch_is_usb4(sw))
1037 return 0;
1038
1039 tb_switch_for_each_port(sw, port) {
1040 struct usb4_port *usb4;
1041
1042 if (!tb_port_is_null(port))
1043 continue;
1044 if (!port->cap_usb4)
1045 continue;
1046
1047 usb4 = usb4_port_device_add(port);
1048 if (IS_ERR(usb4)) {
1049 usb4_switch_remove_ports(sw);
1050 return PTR_ERR(usb4);
1051 }
1052
1053 port->usb4 = usb4;
1054 }
1055
1056 return 0;
1057 }
1058
1059 /**
1060 * usb4_switch_remove_ports() - Removes USB4 ports from this router
1061 * @sw: USB4 router
1062 *
1063 * Unregisters previously registered USB4 ports.
1064 */
usb4_switch_remove_ports(struct tb_switch * sw)1065 void usb4_switch_remove_ports(struct tb_switch *sw)
1066 {
1067 struct tb_port *port;
1068
1069 tb_switch_for_each_port(sw, port) {
1070 if (port->usb4) {
1071 usb4_port_device_remove(port->usb4);
1072 port->usb4 = NULL;
1073 }
1074 }
1075 }
1076
1077 /**
1078 * usb4_port_unlock() - Unlock USB4 downstream port
1079 * @port: USB4 port to unlock
1080 *
1081 * Unlocks USB4 downstream port so that the connection manager can
1082 * access the router below this port.
1083 */
usb4_port_unlock(struct tb_port * port)1084 int usb4_port_unlock(struct tb_port *port)
1085 {
1086 int ret;
1087 u32 val;
1088
1089 ret = tb_port_read(port, &val, TB_CFG_PORT, ADP_CS_4, 1);
1090 if (ret)
1091 return ret;
1092
1093 val &= ~ADP_CS_4_LCK;
1094 return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_4, 1);
1095 }
1096
1097 /**
1098 * usb4_port_hotplug_enable() - Enables hotplug for a port
1099 * @port: USB4 port to operate on
1100 *
1101 * Enables hot plug events on a given port. This is only intended
1102 * to be used on lane, DP-IN, and DP-OUT adapters.
1103 */
usb4_port_hotplug_enable(struct tb_port * port)1104 int usb4_port_hotplug_enable(struct tb_port *port)
1105 {
1106 int ret;
1107 u32 val;
1108
1109 ret = tb_port_read(port, &val, TB_CFG_PORT, ADP_CS_5, 1);
1110 if (ret)
1111 return ret;
1112
1113 val &= ~ADP_CS_5_DHP;
1114 return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_5, 1);
1115 }
1116
1117 /**
1118 * usb4_port_reset() - Issue downstream port reset
1119 * @port: USB4 port to reset
1120 *
1121 * Issues downstream port reset to @port.
1122 */
usb4_port_reset(struct tb_port * port)1123 int usb4_port_reset(struct tb_port *port)
1124 {
1125 int ret;
1126 u32 val;
1127
1128 if (!port->cap_usb4)
1129 return -EINVAL;
1130
1131 ret = tb_port_read(port, &val, TB_CFG_PORT,
1132 port->cap_usb4 + PORT_CS_19, 1);
1133 if (ret)
1134 return ret;
1135
1136 val |= PORT_CS_19_DPR;
1137
1138 ret = tb_port_write(port, &val, TB_CFG_PORT,
1139 port->cap_usb4 + PORT_CS_19, 1);
1140 if (ret)
1141 return ret;
1142
1143 fsleep(10000);
1144
1145 ret = tb_port_read(port, &val, TB_CFG_PORT,
1146 port->cap_usb4 + PORT_CS_19, 1);
1147 if (ret)
1148 return ret;
1149
1150 val &= ~PORT_CS_19_DPR;
1151
1152 return tb_port_write(port, &val, TB_CFG_PORT,
1153 port->cap_usb4 + PORT_CS_19, 1);
1154 }
1155
usb4_port_set_configured(struct tb_port * port,bool configured)1156 static int usb4_port_set_configured(struct tb_port *port, bool configured)
1157 {
1158 int ret;
1159 u32 val;
1160
1161 if (!port->cap_usb4)
1162 return -EINVAL;
1163
1164 ret = tb_port_read(port, &val, TB_CFG_PORT,
1165 port->cap_usb4 + PORT_CS_19, 1);
1166 if (ret)
1167 return ret;
1168
1169 if (configured)
1170 val |= PORT_CS_19_PC;
1171 else
1172 val &= ~PORT_CS_19_PC;
1173
1174 return tb_port_write(port, &val, TB_CFG_PORT,
1175 port->cap_usb4 + PORT_CS_19, 1);
1176 }
1177
1178 /**
1179 * usb4_port_configure() - Set USB4 port configured
1180 * @port: USB4 router
1181 *
1182 * Sets the USB4 link to be configured for power management purposes.
1183 */
usb4_port_configure(struct tb_port * port)1184 int usb4_port_configure(struct tb_port *port)
1185 {
1186 return usb4_port_set_configured(port, true);
1187 }
1188
1189 /**
1190 * usb4_port_unconfigure() - Set USB4 port unconfigured
1191 * @port: USB4 router
1192 *
1193 * Sets the USB4 link to be unconfigured for power management purposes.
1194 */
usb4_port_unconfigure(struct tb_port * port)1195 void usb4_port_unconfigure(struct tb_port *port)
1196 {
1197 usb4_port_set_configured(port, false);
1198 }
1199
usb4_set_xdomain_configured(struct tb_port * port,bool configured)1200 static int usb4_set_xdomain_configured(struct tb_port *port, bool configured)
1201 {
1202 int ret;
1203 u32 val;
1204
1205 if (!port->cap_usb4)
1206 return -EINVAL;
1207
1208 ret = tb_port_read(port, &val, TB_CFG_PORT,
1209 port->cap_usb4 + PORT_CS_19, 1);
1210 if (ret)
1211 return ret;
1212
1213 if (configured)
1214 val |= PORT_CS_19_PID;
1215 else
1216 val &= ~PORT_CS_19_PID;
1217
1218 return tb_port_write(port, &val, TB_CFG_PORT,
1219 port->cap_usb4 + PORT_CS_19, 1);
1220 }
1221
1222 /**
1223 * usb4_port_configure_xdomain() - Configure port for XDomain
1224 * @port: USB4 port connected to another host
1225 * @xd: XDomain that is connected to the port
1226 *
1227 * Marks the USB4 port as being connected to another host and updates
1228 * the link type. Returns %0 in success and negative errno in failure.
1229 */
usb4_port_configure_xdomain(struct tb_port * port,struct tb_xdomain * xd)1230 int usb4_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd)
1231 {
1232 xd->link_usb4 = link_is_usb4(port);
1233 return usb4_set_xdomain_configured(port, true);
1234 }
1235
1236 /**
1237 * usb4_port_unconfigure_xdomain() - Unconfigure port for XDomain
1238 * @port: USB4 port that was connected to another host
1239 *
1240 * Clears USB4 port from being marked as XDomain.
1241 */
usb4_port_unconfigure_xdomain(struct tb_port * port)1242 void usb4_port_unconfigure_xdomain(struct tb_port *port)
1243 {
1244 usb4_set_xdomain_configured(port, false);
1245 }
1246
usb4_port_wait_for_bit(struct tb_port * port,u32 offset,u32 bit,u32 value,int timeout_msec)1247 static int usb4_port_wait_for_bit(struct tb_port *port, u32 offset, u32 bit,
1248 u32 value, int timeout_msec)
1249 {
1250 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1251
1252 do {
1253 u32 val;
1254 int ret;
1255
1256 ret = tb_port_read(port, &val, TB_CFG_PORT, offset, 1);
1257 if (ret)
1258 return ret;
1259
1260 if ((val & bit) == value)
1261 return 0;
1262
1263 usleep_range(50, 100);
1264 } while (ktime_before(ktime_get(), timeout));
1265
1266 return -ETIMEDOUT;
1267 }
1268
usb4_port_read_data(struct tb_port * port,void * data,size_t dwords)1269 static int usb4_port_read_data(struct tb_port *port, void *data, size_t dwords)
1270 {
1271 if (dwords > USB4_DATA_DWORDS)
1272 return -EINVAL;
1273
1274 return tb_port_read(port, data, TB_CFG_PORT, port->cap_usb4 + PORT_CS_2,
1275 dwords);
1276 }
1277
usb4_port_write_data(struct tb_port * port,const void * data,size_t dwords)1278 static int usb4_port_write_data(struct tb_port *port, const void *data,
1279 size_t dwords)
1280 {
1281 if (dwords > USB4_DATA_DWORDS)
1282 return -EINVAL;
1283
1284 return tb_port_write(port, data, TB_CFG_PORT, port->cap_usb4 + PORT_CS_2,
1285 dwords);
1286 }
1287
usb4_port_sb_read(struct tb_port * port,enum usb4_sb_target target,u8 index,u8 reg,void * buf,u8 size)1288 static int usb4_port_sb_read(struct tb_port *port, enum usb4_sb_target target,
1289 u8 index, u8 reg, void *buf, u8 size)
1290 {
1291 size_t dwords = DIV_ROUND_UP(size, 4);
1292 int ret;
1293 u32 val;
1294
1295 if (!port->cap_usb4)
1296 return -EINVAL;
1297
1298 val = reg;
1299 val |= size << PORT_CS_1_LENGTH_SHIFT;
1300 val |= (target << PORT_CS_1_TARGET_SHIFT) & PORT_CS_1_TARGET_MASK;
1301 if (target == USB4_SB_TARGET_RETIMER)
1302 val |= (index << PORT_CS_1_RETIMER_INDEX_SHIFT);
1303 val |= PORT_CS_1_PND;
1304
1305 ret = tb_port_write(port, &val, TB_CFG_PORT,
1306 port->cap_usb4 + PORT_CS_1, 1);
1307 if (ret)
1308 return ret;
1309
1310 ret = usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_1,
1311 PORT_CS_1_PND, 0, 500);
1312 if (ret)
1313 return ret;
1314
1315 ret = tb_port_read(port, &val, TB_CFG_PORT,
1316 port->cap_usb4 + PORT_CS_1, 1);
1317 if (ret)
1318 return ret;
1319
1320 if (val & PORT_CS_1_NR)
1321 return -ENODEV;
1322 if (val & PORT_CS_1_RC)
1323 return -EIO;
1324
1325 return buf ? usb4_port_read_data(port, buf, dwords) : 0;
1326 }
1327
usb4_port_sb_write(struct tb_port * port,enum usb4_sb_target target,u8 index,u8 reg,const void * buf,u8 size)1328 static int usb4_port_sb_write(struct tb_port *port, enum usb4_sb_target target,
1329 u8 index, u8 reg, const void *buf, u8 size)
1330 {
1331 size_t dwords = DIV_ROUND_UP(size, 4);
1332 int ret;
1333 u32 val;
1334
1335 if (!port->cap_usb4)
1336 return -EINVAL;
1337
1338 if (buf) {
1339 ret = usb4_port_write_data(port, buf, dwords);
1340 if (ret)
1341 return ret;
1342 }
1343
1344 val = reg;
1345 val |= size << PORT_CS_1_LENGTH_SHIFT;
1346 val |= PORT_CS_1_WNR_WRITE;
1347 val |= (target << PORT_CS_1_TARGET_SHIFT) & PORT_CS_1_TARGET_MASK;
1348 if (target == USB4_SB_TARGET_RETIMER)
1349 val |= (index << PORT_CS_1_RETIMER_INDEX_SHIFT);
1350 val |= PORT_CS_1_PND;
1351
1352 ret = tb_port_write(port, &val, TB_CFG_PORT,
1353 port->cap_usb4 + PORT_CS_1, 1);
1354 if (ret)
1355 return ret;
1356
1357 ret = usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_1,
1358 PORT_CS_1_PND, 0, 500);
1359 if (ret)
1360 return ret;
1361
1362 ret = tb_port_read(port, &val, TB_CFG_PORT,
1363 port->cap_usb4 + PORT_CS_1, 1);
1364 if (ret)
1365 return ret;
1366
1367 if (val & PORT_CS_1_NR)
1368 return -ENODEV;
1369 if (val & PORT_CS_1_RC)
1370 return -EIO;
1371
1372 return 0;
1373 }
1374
usb4_port_sb_opcode_err_to_errno(u32 val)1375 static int usb4_port_sb_opcode_err_to_errno(u32 val)
1376 {
1377 switch (val) {
1378 case 0:
1379 return 0;
1380 case USB4_SB_OPCODE_ERR:
1381 return -EAGAIN;
1382 case USB4_SB_OPCODE_ONS:
1383 return -EOPNOTSUPP;
1384 default:
1385 return -EIO;
1386 }
1387 }
1388
usb4_port_sb_op(struct tb_port * port,enum usb4_sb_target target,u8 index,enum usb4_sb_opcode opcode,int timeout_msec)1389 static int usb4_port_sb_op(struct tb_port *port, enum usb4_sb_target target,
1390 u8 index, enum usb4_sb_opcode opcode, int timeout_msec)
1391 {
1392 ktime_t timeout;
1393 u32 val;
1394 int ret;
1395
1396 val = opcode;
1397 ret = usb4_port_sb_write(port, target, index, USB4_SB_OPCODE, &val,
1398 sizeof(val));
1399 if (ret)
1400 return ret;
1401
1402 timeout = ktime_add_ms(ktime_get(), timeout_msec);
1403
1404 do {
1405 /* Check results */
1406 ret = usb4_port_sb_read(port, target, index, USB4_SB_OPCODE,
1407 &val, sizeof(val));
1408 if (ret)
1409 return ret;
1410
1411 if (val != opcode)
1412 return usb4_port_sb_opcode_err_to_errno(val);
1413 } while (ktime_before(ktime_get(), timeout));
1414
1415 return -ETIMEDOUT;
1416 }
1417
usb4_port_set_router_offline(struct tb_port * port,bool offline)1418 static int usb4_port_set_router_offline(struct tb_port *port, bool offline)
1419 {
1420 u32 val = !offline;
1421 int ret;
1422
1423 ret = usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
1424 USB4_SB_METADATA, &val, sizeof(val));
1425 if (ret)
1426 return ret;
1427
1428 val = USB4_SB_OPCODE_ROUTER_OFFLINE;
1429 return usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
1430 USB4_SB_OPCODE, &val, sizeof(val));
1431 }
1432
1433 /**
1434 * usb4_port_router_offline() - Put the USB4 port to offline mode
1435 * @port: USB4 port
1436 *
1437 * This function puts the USB4 port into offline mode. In this mode the
1438 * port does not react on hotplug events anymore. This needs to be
1439 * called before retimer access is done when the USB4 links is not up.
1440 *
1441 * Returns %0 in case of success and negative errno if there was an
1442 * error.
1443 */
usb4_port_router_offline(struct tb_port * port)1444 int usb4_port_router_offline(struct tb_port *port)
1445 {
1446 return usb4_port_set_router_offline(port, true);
1447 }
1448
1449 /**
1450 * usb4_port_router_online() - Put the USB4 port back to online
1451 * @port: USB4 port
1452 *
1453 * Makes the USB4 port functional again.
1454 */
usb4_port_router_online(struct tb_port * port)1455 int usb4_port_router_online(struct tb_port *port)
1456 {
1457 return usb4_port_set_router_offline(port, false);
1458 }
1459
1460 /**
1461 * usb4_port_enumerate_retimers() - Send RT broadcast transaction
1462 * @port: USB4 port
1463 *
1464 * This forces the USB4 port to send broadcast RT transaction which
1465 * makes the retimers on the link to assign index to themselves. Returns
1466 * %0 in case of success and negative errno if there was an error.
1467 */
usb4_port_enumerate_retimers(struct tb_port * port)1468 int usb4_port_enumerate_retimers(struct tb_port *port)
1469 {
1470 u32 val;
1471
1472 val = USB4_SB_OPCODE_ENUMERATE_RETIMERS;
1473 return usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
1474 USB4_SB_OPCODE, &val, sizeof(val));
1475 }
1476
1477 /**
1478 * usb4_port_clx_supported() - Check if CLx is supported by the link
1479 * @port: Port to check for CLx support for
1480 *
1481 * PORT_CS_18_CPS bit reflects if the link supports CLx including
1482 * active cables (if connected on the link).
1483 */
usb4_port_clx_supported(struct tb_port * port)1484 bool usb4_port_clx_supported(struct tb_port *port)
1485 {
1486 int ret;
1487 u32 val;
1488
1489 ret = tb_port_read(port, &val, TB_CFG_PORT,
1490 port->cap_usb4 + PORT_CS_18, 1);
1491 if (ret)
1492 return false;
1493
1494 return !!(val & PORT_CS_18_CPS);
1495 }
1496
1497 /**
1498 * usb4_port_margining_caps() - Read USB4 port marginig capabilities
1499 * @port: USB4 port
1500 * @caps: Array with at least two elements to hold the results
1501 *
1502 * Reads the USB4 port lane margining capabilities into @caps.
1503 */
usb4_port_margining_caps(struct tb_port * port,u32 * caps)1504 int usb4_port_margining_caps(struct tb_port *port, u32 *caps)
1505 {
1506 int ret;
1507
1508 ret = usb4_port_sb_op(port, USB4_SB_TARGET_ROUTER, 0,
1509 USB4_SB_OPCODE_READ_LANE_MARGINING_CAP, 500);
1510 if (ret)
1511 return ret;
1512
1513 return usb4_port_sb_read(port, USB4_SB_TARGET_ROUTER, 0,
1514 USB4_SB_DATA, caps, sizeof(*caps) * 2);
1515 }
1516
1517 /**
1518 * usb4_port_hw_margin() - Run hardware lane margining on port
1519 * @port: USB4 port
1520 * @lanes: Which lanes to run (must match the port capabilities). Can be
1521 * %0, %1 or %7.
1522 * @ber_level: BER level contour value
1523 * @timing: Perform timing margining instead of voltage
1524 * @right_high: Use Right/high margin instead of left/low
1525 * @results: Array with at least two elements to hold the results
1526 *
1527 * Runs hardware lane margining on USB4 port and returns the result in
1528 * @results.
1529 */
usb4_port_hw_margin(struct tb_port * port,unsigned int lanes,unsigned int ber_level,bool timing,bool right_high,u32 * results)1530 int usb4_port_hw_margin(struct tb_port *port, unsigned int lanes,
1531 unsigned int ber_level, bool timing, bool right_high,
1532 u32 *results)
1533 {
1534 u32 val;
1535 int ret;
1536
1537 val = lanes;
1538 if (timing)
1539 val |= USB4_MARGIN_HW_TIME;
1540 if (right_high)
1541 val |= USB4_MARGIN_HW_RH;
1542 if (ber_level)
1543 val |= (ber_level << USB4_MARGIN_HW_BER_SHIFT) &
1544 USB4_MARGIN_HW_BER_MASK;
1545
1546 ret = usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
1547 USB4_SB_METADATA, &val, sizeof(val));
1548 if (ret)
1549 return ret;
1550
1551 ret = usb4_port_sb_op(port, USB4_SB_TARGET_ROUTER, 0,
1552 USB4_SB_OPCODE_RUN_HW_LANE_MARGINING, 2500);
1553 if (ret)
1554 return ret;
1555
1556 return usb4_port_sb_read(port, USB4_SB_TARGET_ROUTER, 0,
1557 USB4_SB_DATA, results, sizeof(*results) * 2);
1558 }
1559
1560 /**
1561 * usb4_port_sw_margin() - Run software lane margining on port
1562 * @port: USB4 port
1563 * @lanes: Which lanes to run (must match the port capabilities). Can be
1564 * %0, %1 or %7.
1565 * @timing: Perform timing margining instead of voltage
1566 * @right_high: Use Right/high margin instead of left/low
1567 * @counter: What to do with the error counter
1568 *
1569 * Runs software lane margining on USB4 port. Read back the error
1570 * counters by calling usb4_port_sw_margin_errors(). Returns %0 in
1571 * success and negative errno otherwise.
1572 */
usb4_port_sw_margin(struct tb_port * port,unsigned int lanes,bool timing,bool right_high,u32 counter)1573 int usb4_port_sw_margin(struct tb_port *port, unsigned int lanes, bool timing,
1574 bool right_high, u32 counter)
1575 {
1576 u32 val;
1577 int ret;
1578
1579 val = lanes;
1580 if (timing)
1581 val |= USB4_MARGIN_SW_TIME;
1582 if (right_high)
1583 val |= USB4_MARGIN_SW_RH;
1584 val |= (counter << USB4_MARGIN_SW_COUNTER_SHIFT) &
1585 USB4_MARGIN_SW_COUNTER_MASK;
1586
1587 ret = usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
1588 USB4_SB_METADATA, &val, sizeof(val));
1589 if (ret)
1590 return ret;
1591
1592 return usb4_port_sb_op(port, USB4_SB_TARGET_ROUTER, 0,
1593 USB4_SB_OPCODE_RUN_SW_LANE_MARGINING, 2500);
1594 }
1595
1596 /**
1597 * usb4_port_sw_margin_errors() - Read the software margining error counters
1598 * @port: USB4 port
1599 * @errors: Error metadata is copied here.
1600 *
1601 * This reads back the software margining error counters from the port.
1602 * Returns %0 in success and negative errno otherwise.
1603 */
usb4_port_sw_margin_errors(struct tb_port * port,u32 * errors)1604 int usb4_port_sw_margin_errors(struct tb_port *port, u32 *errors)
1605 {
1606 int ret;
1607
1608 ret = usb4_port_sb_op(port, USB4_SB_TARGET_ROUTER, 0,
1609 USB4_SB_OPCODE_READ_SW_MARGIN_ERR, 150);
1610 if (ret)
1611 return ret;
1612
1613 return usb4_port_sb_read(port, USB4_SB_TARGET_ROUTER, 0,
1614 USB4_SB_METADATA, errors, sizeof(*errors));
1615 }
1616
usb4_port_retimer_op(struct tb_port * port,u8 index,enum usb4_sb_opcode opcode,int timeout_msec)1617 static inline int usb4_port_retimer_op(struct tb_port *port, u8 index,
1618 enum usb4_sb_opcode opcode,
1619 int timeout_msec)
1620 {
1621 return usb4_port_sb_op(port, USB4_SB_TARGET_RETIMER, index, opcode,
1622 timeout_msec);
1623 }
1624
1625 /**
1626 * usb4_port_retimer_set_inbound_sbtx() - Enable sideband channel transactions
1627 * @port: USB4 port
1628 * @index: Retimer index
1629 *
1630 * Enables sideband channel transations on SBTX. Can be used when USB4
1631 * link does not go up, for example if there is no device connected.
1632 */
usb4_port_retimer_set_inbound_sbtx(struct tb_port * port,u8 index)1633 int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index)
1634 {
1635 int ret;
1636
1637 ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX,
1638 500);
1639
1640 if (ret != -ENODEV)
1641 return ret;
1642
1643 /*
1644 * Per the USB4 retimer spec, the retimer is not required to
1645 * send an RT (Retimer Transaction) response for the first
1646 * SET_INBOUND_SBTX command
1647 */
1648 return usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX,
1649 500);
1650 }
1651
1652 /**
1653 * usb4_port_retimer_unset_inbound_sbtx() - Disable sideband channel transactions
1654 * @port: USB4 port
1655 * @index: Retimer index
1656 *
1657 * Disables sideband channel transations on SBTX. The reverse of
1658 * usb4_port_retimer_set_inbound_sbtx().
1659 */
usb4_port_retimer_unset_inbound_sbtx(struct tb_port * port,u8 index)1660 int usb4_port_retimer_unset_inbound_sbtx(struct tb_port *port, u8 index)
1661 {
1662 return usb4_port_retimer_op(port, index,
1663 USB4_SB_OPCODE_UNSET_INBOUND_SBTX, 500);
1664 }
1665
1666 /**
1667 * usb4_port_retimer_read() - Read from retimer sideband registers
1668 * @port: USB4 port
1669 * @index: Retimer index
1670 * @reg: Sideband register to read
1671 * @buf: Data from @reg is stored here
1672 * @size: Number of bytes to read
1673 *
1674 * Function reads retimer sideband registers starting from @reg. The
1675 * retimer is connected to @port at @index. Returns %0 in case of
1676 * success, and read data is copied to @buf. If there is no retimer
1677 * present at given @index returns %-ENODEV. In any other failure
1678 * returns negative errno.
1679 */
usb4_port_retimer_read(struct tb_port * port,u8 index,u8 reg,void * buf,u8 size)1680 int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf,
1681 u8 size)
1682 {
1683 return usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index, reg, buf,
1684 size);
1685 }
1686
1687 /**
1688 * usb4_port_retimer_write() - Write to retimer sideband registers
1689 * @port: USB4 port
1690 * @index: Retimer index
1691 * @reg: Sideband register to write
1692 * @buf: Data that is written starting from @reg
1693 * @size: Number of bytes to write
1694 *
1695 * Writes retimer sideband registers starting from @reg. The retimer is
1696 * connected to @port at @index. Returns %0 in case of success. If there
1697 * is no retimer present at given @index returns %-ENODEV. In any other
1698 * failure returns negative errno.
1699 */
usb4_port_retimer_write(struct tb_port * port,u8 index,u8 reg,const void * buf,u8 size)1700 int usb4_port_retimer_write(struct tb_port *port, u8 index, u8 reg,
1701 const void *buf, u8 size)
1702 {
1703 return usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index, reg, buf,
1704 size);
1705 }
1706
1707 /**
1708 * usb4_port_retimer_is_last() - Is the retimer last on-board retimer
1709 * @port: USB4 port
1710 * @index: Retimer index
1711 *
1712 * If the retimer at @index is last one (connected directly to the
1713 * Type-C port) this function returns %1. If it is not returns %0. If
1714 * the retimer is not present returns %-ENODEV. Otherwise returns
1715 * negative errno.
1716 */
usb4_port_retimer_is_last(struct tb_port * port,u8 index)1717 int usb4_port_retimer_is_last(struct tb_port *port, u8 index)
1718 {
1719 u32 metadata;
1720 int ret;
1721
1722 ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_QUERY_LAST_RETIMER,
1723 500);
1724 if (ret)
1725 return ret;
1726
1727 ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA, &metadata,
1728 sizeof(metadata));
1729 return ret ? ret : metadata & 1;
1730 }
1731
1732 /**
1733 * usb4_port_retimer_nvm_sector_size() - Read retimer NVM sector size
1734 * @port: USB4 port
1735 * @index: Retimer index
1736 *
1737 * Reads NVM sector size (in bytes) of a retimer at @index. This
1738 * operation can be used to determine whether the retimer supports NVM
1739 * upgrade for example. Returns sector size in bytes or negative errno
1740 * in case of error. Specifically returns %-ENODEV if there is no
1741 * retimer at @index.
1742 */
usb4_port_retimer_nvm_sector_size(struct tb_port * port,u8 index)1743 int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index)
1744 {
1745 u32 metadata;
1746 int ret;
1747
1748 ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE,
1749 500);
1750 if (ret)
1751 return ret;
1752
1753 ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA, &metadata,
1754 sizeof(metadata));
1755 return ret ? ret : metadata & USB4_NVM_SECTOR_SIZE_MASK;
1756 }
1757
1758 /**
1759 * usb4_port_retimer_nvm_set_offset() - Set NVM write offset
1760 * @port: USB4 port
1761 * @index: Retimer index
1762 * @address: Start offset
1763 *
1764 * Exlicitly sets NVM write offset. Normally when writing to NVM this is
1765 * done automatically by usb4_port_retimer_nvm_write().
1766 *
1767 * Returns %0 in success and negative errno if there was a failure.
1768 */
usb4_port_retimer_nvm_set_offset(struct tb_port * port,u8 index,unsigned int address)1769 int usb4_port_retimer_nvm_set_offset(struct tb_port *port, u8 index,
1770 unsigned int address)
1771 {
1772 u32 metadata, dwaddress;
1773 int ret;
1774
1775 dwaddress = address / 4;
1776 metadata = (dwaddress << USB4_NVM_SET_OFFSET_SHIFT) &
1777 USB4_NVM_SET_OFFSET_MASK;
1778
1779 ret = usb4_port_retimer_write(port, index, USB4_SB_METADATA, &metadata,
1780 sizeof(metadata));
1781 if (ret)
1782 return ret;
1783
1784 return usb4_port_retimer_op(port, index, USB4_SB_OPCODE_NVM_SET_OFFSET,
1785 500);
1786 }
1787
1788 struct retimer_info {
1789 struct tb_port *port;
1790 u8 index;
1791 };
1792
usb4_port_retimer_nvm_write_next_block(void * data,unsigned int dwaddress,const void * buf,size_t dwords)1793 static int usb4_port_retimer_nvm_write_next_block(void *data,
1794 unsigned int dwaddress, const void *buf, size_t dwords)
1795
1796 {
1797 const struct retimer_info *info = data;
1798 struct tb_port *port = info->port;
1799 u8 index = info->index;
1800 int ret;
1801
1802 ret = usb4_port_retimer_write(port, index, USB4_SB_DATA,
1803 buf, dwords * 4);
1804 if (ret)
1805 return ret;
1806
1807 return usb4_port_retimer_op(port, index,
1808 USB4_SB_OPCODE_NVM_BLOCK_WRITE, 1000);
1809 }
1810
1811 /**
1812 * usb4_port_retimer_nvm_write() - Write to retimer NVM
1813 * @port: USB4 port
1814 * @index: Retimer index
1815 * @address: Byte address where to start the write
1816 * @buf: Data to write
1817 * @size: Size in bytes how much to write
1818 *
1819 * Writes @size bytes from @buf to the retimer NVM. Used for NVM
1820 * upgrade. Returns %0 if the data was written successfully and negative
1821 * errno in case of failure. Specifically returns %-ENODEV if there is
1822 * no retimer at @index.
1823 */
usb4_port_retimer_nvm_write(struct tb_port * port,u8 index,unsigned int address,const void * buf,size_t size)1824 int usb4_port_retimer_nvm_write(struct tb_port *port, u8 index, unsigned int address,
1825 const void *buf, size_t size)
1826 {
1827 struct retimer_info info = { .port = port, .index = index };
1828 int ret;
1829
1830 ret = usb4_port_retimer_nvm_set_offset(port, index, address);
1831 if (ret)
1832 return ret;
1833
1834 return tb_nvm_write_data(address, buf, size, USB4_DATA_RETRIES,
1835 usb4_port_retimer_nvm_write_next_block, &info);
1836 }
1837
1838 /**
1839 * usb4_port_retimer_nvm_authenticate() - Start retimer NVM upgrade
1840 * @port: USB4 port
1841 * @index: Retimer index
1842 *
1843 * After the new NVM image has been written via usb4_port_retimer_nvm_write()
1844 * this function can be used to trigger the NVM upgrade process. If
1845 * successful the retimer restarts with the new NVM and may not have the
1846 * index set so one needs to call usb4_port_enumerate_retimers() to
1847 * force index to be assigned.
1848 */
usb4_port_retimer_nvm_authenticate(struct tb_port * port,u8 index)1849 int usb4_port_retimer_nvm_authenticate(struct tb_port *port, u8 index)
1850 {
1851 u32 val;
1852
1853 /*
1854 * We need to use the raw operation here because once the
1855 * authentication completes the retimer index is not set anymore
1856 * so we do not get back the status now.
1857 */
1858 val = USB4_SB_OPCODE_NVM_AUTH_WRITE;
1859 return usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
1860 USB4_SB_OPCODE, &val, sizeof(val));
1861 }
1862
1863 /**
1864 * usb4_port_retimer_nvm_authenticate_status() - Read status of NVM upgrade
1865 * @port: USB4 port
1866 * @index: Retimer index
1867 * @status: Raw status code read from metadata
1868 *
1869 * This can be called after usb4_port_retimer_nvm_authenticate() and
1870 * usb4_port_enumerate_retimers() to fetch status of the NVM upgrade.
1871 *
1872 * Returns %0 if the authentication status was successfully read. The
1873 * completion metadata (the result) is then stored into @status. If
1874 * reading the status fails, returns negative errno.
1875 */
usb4_port_retimer_nvm_authenticate_status(struct tb_port * port,u8 index,u32 * status)1876 int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
1877 u32 *status)
1878 {
1879 u32 metadata, val;
1880 int ret;
1881
1882 ret = usb4_port_retimer_read(port, index, USB4_SB_OPCODE, &val,
1883 sizeof(val));
1884 if (ret)
1885 return ret;
1886
1887 ret = usb4_port_sb_opcode_err_to_errno(val);
1888 switch (ret) {
1889 case 0:
1890 *status = 0;
1891 return 0;
1892
1893 case -EAGAIN:
1894 ret = usb4_port_retimer_read(port, index, USB4_SB_METADATA,
1895 &metadata, sizeof(metadata));
1896 if (ret)
1897 return ret;
1898
1899 *status = metadata & USB4_SB_METADATA_NVM_AUTH_WRITE_MASK;
1900 return 0;
1901
1902 default:
1903 return ret;
1904 }
1905 }
1906
usb4_port_retimer_nvm_read_block(void * data,unsigned int dwaddress,void * buf,size_t dwords)1907 static int usb4_port_retimer_nvm_read_block(void *data, unsigned int dwaddress,
1908 void *buf, size_t dwords)
1909 {
1910 const struct retimer_info *info = data;
1911 struct tb_port *port = info->port;
1912 u8 index = info->index;
1913 u32 metadata;
1914 int ret;
1915
1916 metadata = dwaddress << USB4_NVM_READ_OFFSET_SHIFT;
1917 if (dwords < USB4_DATA_DWORDS)
1918 metadata |= dwords << USB4_NVM_READ_LENGTH_SHIFT;
1919
1920 ret = usb4_port_retimer_write(port, index, USB4_SB_METADATA, &metadata,
1921 sizeof(metadata));
1922 if (ret)
1923 return ret;
1924
1925 ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_NVM_READ, 500);
1926 if (ret)
1927 return ret;
1928
1929 return usb4_port_retimer_read(port, index, USB4_SB_DATA, buf,
1930 dwords * 4);
1931 }
1932
1933 /**
1934 * usb4_port_retimer_nvm_read() - Read contents of retimer NVM
1935 * @port: USB4 port
1936 * @index: Retimer index
1937 * @address: NVM address (in bytes) to start reading
1938 * @buf: Data read from NVM is stored here
1939 * @size: Number of bytes to read
1940 *
1941 * Reads retimer NVM and copies the contents to @buf. Returns %0 if the
1942 * read was successful and negative errno in case of failure.
1943 * Specifically returns %-ENODEV if there is no retimer at @index.
1944 */
usb4_port_retimer_nvm_read(struct tb_port * port,u8 index,unsigned int address,void * buf,size_t size)1945 int usb4_port_retimer_nvm_read(struct tb_port *port, u8 index,
1946 unsigned int address, void *buf, size_t size)
1947 {
1948 struct retimer_info info = { .port = port, .index = index };
1949
1950 return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
1951 usb4_port_retimer_nvm_read_block, &info);
1952 }
1953
1954 static inline unsigned int
usb4_usb3_port_max_bandwidth(const struct tb_port * port,unsigned int bw)1955 usb4_usb3_port_max_bandwidth(const struct tb_port *port, unsigned int bw)
1956 {
1957 /* Take the possible bandwidth limitation into account */
1958 if (port->max_bw)
1959 return min(bw, port->max_bw);
1960 return bw;
1961 }
1962
1963 /**
1964 * usb4_usb3_port_max_link_rate() - Maximum support USB3 link rate
1965 * @port: USB3 adapter port
1966 *
1967 * Return maximum supported link rate of a USB3 adapter in Mb/s.
1968 * Negative errno in case of error.
1969 */
usb4_usb3_port_max_link_rate(struct tb_port * port)1970 int usb4_usb3_port_max_link_rate(struct tb_port *port)
1971 {
1972 int ret, lr;
1973 u32 val;
1974
1975 if (!tb_port_is_usb3_down(port) && !tb_port_is_usb3_up(port))
1976 return -EINVAL;
1977
1978 ret = tb_port_read(port, &val, TB_CFG_PORT,
1979 port->cap_adap + ADP_USB3_CS_4, 1);
1980 if (ret)
1981 return ret;
1982
1983 lr = (val & ADP_USB3_CS_4_MSLR_MASK) >> ADP_USB3_CS_4_MSLR_SHIFT;
1984 ret = lr == ADP_USB3_CS_4_MSLR_20G ? 20000 : 10000;
1985
1986 return usb4_usb3_port_max_bandwidth(port, ret);
1987 }
1988
1989 /**
1990 * usb4_usb3_port_actual_link_rate() - Established USB3 link rate
1991 * @port: USB3 adapter port
1992 *
1993 * Return actual established link rate of a USB3 adapter in Mb/s. If the
1994 * link is not up returns %0 and negative errno in case of failure.
1995 */
usb4_usb3_port_actual_link_rate(struct tb_port * port)1996 int usb4_usb3_port_actual_link_rate(struct tb_port *port)
1997 {
1998 int ret, lr;
1999 u32 val;
2000
2001 if (!tb_port_is_usb3_down(port) && !tb_port_is_usb3_up(port))
2002 return -EINVAL;
2003
2004 ret = tb_port_read(port, &val, TB_CFG_PORT,
2005 port->cap_adap + ADP_USB3_CS_4, 1);
2006 if (ret)
2007 return ret;
2008
2009 if (!(val & ADP_USB3_CS_4_ULV))
2010 return 0;
2011
2012 lr = val & ADP_USB3_CS_4_ALR_MASK;
2013 ret = lr == ADP_USB3_CS_4_ALR_20G ? 20000 : 10000;
2014
2015 return usb4_usb3_port_max_bandwidth(port, ret);
2016 }
2017
usb4_usb3_port_cm_request(struct tb_port * port,bool request)2018 static int usb4_usb3_port_cm_request(struct tb_port *port, bool request)
2019 {
2020 int ret;
2021 u32 val;
2022
2023 if (!tb_port_is_usb3_down(port))
2024 return -EINVAL;
2025 if (tb_route(port->sw))
2026 return -EINVAL;
2027
2028 ret = tb_port_read(port, &val, TB_CFG_PORT,
2029 port->cap_adap + ADP_USB3_CS_2, 1);
2030 if (ret)
2031 return ret;
2032
2033 if (request)
2034 val |= ADP_USB3_CS_2_CMR;
2035 else
2036 val &= ~ADP_USB3_CS_2_CMR;
2037
2038 ret = tb_port_write(port, &val, TB_CFG_PORT,
2039 port->cap_adap + ADP_USB3_CS_2, 1);
2040 if (ret)
2041 return ret;
2042
2043 /*
2044 * We can use val here directly as the CMR bit is in the same place
2045 * as HCA. Just mask out others.
2046 */
2047 val &= ADP_USB3_CS_2_CMR;
2048 return usb4_port_wait_for_bit(port, port->cap_adap + ADP_USB3_CS_1,
2049 ADP_USB3_CS_1_HCA, val, 1500);
2050 }
2051
usb4_usb3_port_set_cm_request(struct tb_port * port)2052 static inline int usb4_usb3_port_set_cm_request(struct tb_port *port)
2053 {
2054 return usb4_usb3_port_cm_request(port, true);
2055 }
2056
usb4_usb3_port_clear_cm_request(struct tb_port * port)2057 static inline int usb4_usb3_port_clear_cm_request(struct tb_port *port)
2058 {
2059 return usb4_usb3_port_cm_request(port, false);
2060 }
2061
usb3_bw_to_mbps(u32 bw,u8 scale)2062 static unsigned int usb3_bw_to_mbps(u32 bw, u8 scale)
2063 {
2064 unsigned long uframes;
2065
2066 uframes = bw * 512UL << scale;
2067 return DIV_ROUND_CLOSEST(uframes * 8000, MEGA);
2068 }
2069
mbps_to_usb3_bw(unsigned int mbps,u8 scale)2070 static u32 mbps_to_usb3_bw(unsigned int mbps, u8 scale)
2071 {
2072 unsigned long uframes;
2073
2074 /* 1 uframe is 1/8 ms (125 us) -> 1 / 8000 s */
2075 uframes = ((unsigned long)mbps * MEGA) / 8000;
2076 return DIV_ROUND_UP(uframes, 512UL << scale);
2077 }
2078
usb4_usb3_port_read_allocated_bandwidth(struct tb_port * port,int * upstream_bw,int * downstream_bw)2079 static int usb4_usb3_port_read_allocated_bandwidth(struct tb_port *port,
2080 int *upstream_bw,
2081 int *downstream_bw)
2082 {
2083 u32 val, bw, scale;
2084 int ret;
2085
2086 ret = tb_port_read(port, &val, TB_CFG_PORT,
2087 port->cap_adap + ADP_USB3_CS_2, 1);
2088 if (ret)
2089 return ret;
2090
2091 ret = tb_port_read(port, &scale, TB_CFG_PORT,
2092 port->cap_adap + ADP_USB3_CS_3, 1);
2093 if (ret)
2094 return ret;
2095
2096 scale &= ADP_USB3_CS_3_SCALE_MASK;
2097
2098 bw = val & ADP_USB3_CS_2_AUBW_MASK;
2099 *upstream_bw = usb3_bw_to_mbps(bw, scale);
2100
2101 bw = (val & ADP_USB3_CS_2_ADBW_MASK) >> ADP_USB3_CS_2_ADBW_SHIFT;
2102 *downstream_bw = usb3_bw_to_mbps(bw, scale);
2103
2104 return 0;
2105 }
2106
2107 /**
2108 * usb4_usb3_port_allocated_bandwidth() - Bandwidth allocated for USB3
2109 * @port: USB3 adapter port
2110 * @upstream_bw: Allocated upstream bandwidth is stored here
2111 * @downstream_bw: Allocated downstream bandwidth is stored here
2112 *
2113 * Stores currently allocated USB3 bandwidth into @upstream_bw and
2114 * @downstream_bw in Mb/s. Returns %0 in case of success and negative
2115 * errno in failure.
2116 */
usb4_usb3_port_allocated_bandwidth(struct tb_port * port,int * upstream_bw,int * downstream_bw)2117 int usb4_usb3_port_allocated_bandwidth(struct tb_port *port, int *upstream_bw,
2118 int *downstream_bw)
2119 {
2120 int ret;
2121
2122 ret = usb4_usb3_port_set_cm_request(port);
2123 if (ret)
2124 return ret;
2125
2126 ret = usb4_usb3_port_read_allocated_bandwidth(port, upstream_bw,
2127 downstream_bw);
2128 usb4_usb3_port_clear_cm_request(port);
2129
2130 return ret;
2131 }
2132
usb4_usb3_port_read_consumed_bandwidth(struct tb_port * port,int * upstream_bw,int * downstream_bw)2133 static int usb4_usb3_port_read_consumed_bandwidth(struct tb_port *port,
2134 int *upstream_bw,
2135 int *downstream_bw)
2136 {
2137 u32 val, bw, scale;
2138 int ret;
2139
2140 ret = tb_port_read(port, &val, TB_CFG_PORT,
2141 port->cap_adap + ADP_USB3_CS_1, 1);
2142 if (ret)
2143 return ret;
2144
2145 ret = tb_port_read(port, &scale, TB_CFG_PORT,
2146 port->cap_adap + ADP_USB3_CS_3, 1);
2147 if (ret)
2148 return ret;
2149
2150 scale &= ADP_USB3_CS_3_SCALE_MASK;
2151
2152 bw = val & ADP_USB3_CS_1_CUBW_MASK;
2153 *upstream_bw = usb3_bw_to_mbps(bw, scale);
2154
2155 bw = (val & ADP_USB3_CS_1_CDBW_MASK) >> ADP_USB3_CS_1_CDBW_SHIFT;
2156 *downstream_bw = usb3_bw_to_mbps(bw, scale);
2157
2158 return 0;
2159 }
2160
usb4_usb3_port_write_allocated_bandwidth(struct tb_port * port,int upstream_bw,int downstream_bw)2161 static int usb4_usb3_port_write_allocated_bandwidth(struct tb_port *port,
2162 int upstream_bw,
2163 int downstream_bw)
2164 {
2165 u32 val, ubw, dbw, scale;
2166 int ret, max_bw;
2167
2168 /* Figure out suitable scale */
2169 scale = 0;
2170 max_bw = max(upstream_bw, downstream_bw);
2171 while (scale < 64) {
2172 if (mbps_to_usb3_bw(max_bw, scale) < 4096)
2173 break;
2174 scale++;
2175 }
2176
2177 if (WARN_ON(scale >= 64))
2178 return -EINVAL;
2179
2180 ret = tb_port_write(port, &scale, TB_CFG_PORT,
2181 port->cap_adap + ADP_USB3_CS_3, 1);
2182 if (ret)
2183 return ret;
2184
2185 ubw = mbps_to_usb3_bw(upstream_bw, scale);
2186 dbw = mbps_to_usb3_bw(downstream_bw, scale);
2187
2188 tb_port_dbg(port, "scaled bandwidth %u/%u, scale %u\n", ubw, dbw, scale);
2189
2190 ret = tb_port_read(port, &val, TB_CFG_PORT,
2191 port->cap_adap + ADP_USB3_CS_2, 1);
2192 if (ret)
2193 return ret;
2194
2195 val &= ~(ADP_USB3_CS_2_AUBW_MASK | ADP_USB3_CS_2_ADBW_MASK);
2196 val |= dbw << ADP_USB3_CS_2_ADBW_SHIFT;
2197 val |= ubw;
2198
2199 return tb_port_write(port, &val, TB_CFG_PORT,
2200 port->cap_adap + ADP_USB3_CS_2, 1);
2201 }
2202
2203 /**
2204 * usb4_usb3_port_allocate_bandwidth() - Allocate bandwidth for USB3
2205 * @port: USB3 adapter port
2206 * @upstream_bw: New upstream bandwidth
2207 * @downstream_bw: New downstream bandwidth
2208 *
2209 * This can be used to set how much bandwidth is allocated for the USB3
2210 * tunneled isochronous traffic. @upstream_bw and @downstream_bw are the
2211 * new values programmed to the USB3 adapter allocation registers. If
2212 * the values are lower than what is currently consumed the allocation
2213 * is set to what is currently consumed instead (consumed bandwidth
2214 * cannot be taken away by CM). The actual new values are returned in
2215 * @upstream_bw and @downstream_bw.
2216 *
2217 * Returns %0 in case of success and negative errno if there was a
2218 * failure.
2219 */
usb4_usb3_port_allocate_bandwidth(struct tb_port * port,int * upstream_bw,int * downstream_bw)2220 int usb4_usb3_port_allocate_bandwidth(struct tb_port *port, int *upstream_bw,
2221 int *downstream_bw)
2222 {
2223 int ret, consumed_up, consumed_down, allocate_up, allocate_down;
2224
2225 ret = usb4_usb3_port_set_cm_request(port);
2226 if (ret)
2227 return ret;
2228
2229 ret = usb4_usb3_port_read_consumed_bandwidth(port, &consumed_up,
2230 &consumed_down);
2231 if (ret)
2232 goto err_request;
2233
2234 /* Don't allow it go lower than what is consumed */
2235 allocate_up = max(*upstream_bw, consumed_up);
2236 allocate_down = max(*downstream_bw, consumed_down);
2237
2238 ret = usb4_usb3_port_write_allocated_bandwidth(port, allocate_up,
2239 allocate_down);
2240 if (ret)
2241 goto err_request;
2242
2243 *upstream_bw = allocate_up;
2244 *downstream_bw = allocate_down;
2245
2246 err_request:
2247 usb4_usb3_port_clear_cm_request(port);
2248 return ret;
2249 }
2250
2251 /**
2252 * usb4_usb3_port_release_bandwidth() - Release allocated USB3 bandwidth
2253 * @port: USB3 adapter port
2254 * @upstream_bw: New allocated upstream bandwidth
2255 * @downstream_bw: New allocated downstream bandwidth
2256 *
2257 * Releases USB3 allocated bandwidth down to what is actually consumed.
2258 * The new bandwidth is returned in @upstream_bw and @downstream_bw.
2259 *
2260 * Returns 0% in success and negative errno in case of failure.
2261 */
usb4_usb3_port_release_bandwidth(struct tb_port * port,int * upstream_bw,int * downstream_bw)2262 int usb4_usb3_port_release_bandwidth(struct tb_port *port, int *upstream_bw,
2263 int *downstream_bw)
2264 {
2265 int ret, consumed_up, consumed_down;
2266
2267 ret = usb4_usb3_port_set_cm_request(port);
2268 if (ret)
2269 return ret;
2270
2271 ret = usb4_usb3_port_read_consumed_bandwidth(port, &consumed_up,
2272 &consumed_down);
2273 if (ret)
2274 goto err_request;
2275
2276 /*
2277 * Always keep 1000 Mb/s to make sure xHCI has at least some
2278 * bandwidth available for isochronous traffic.
2279 */
2280 if (consumed_up < 1000)
2281 consumed_up = 1000;
2282 if (consumed_down < 1000)
2283 consumed_down = 1000;
2284
2285 ret = usb4_usb3_port_write_allocated_bandwidth(port, consumed_up,
2286 consumed_down);
2287 if (ret)
2288 goto err_request;
2289
2290 *upstream_bw = consumed_up;
2291 *downstream_bw = consumed_down;
2292
2293 err_request:
2294 usb4_usb3_port_clear_cm_request(port);
2295 return ret;
2296 }
2297
is_usb4_dpin(const struct tb_port * port)2298 static bool is_usb4_dpin(const struct tb_port *port)
2299 {
2300 if (!tb_port_is_dpin(port))
2301 return false;
2302 if (!tb_switch_is_usb4(port->sw))
2303 return false;
2304 return true;
2305 }
2306
2307 /**
2308 * usb4_dp_port_set_cm_id() - Assign CM ID to the DP IN adapter
2309 * @port: DP IN adapter
2310 * @cm_id: CM ID to assign
2311 *
2312 * Sets CM ID for the @port. Returns %0 on success and negative errno
2313 * otherwise. Speficially returns %-EOPNOTSUPP if the @port does not
2314 * support this.
2315 */
usb4_dp_port_set_cm_id(struct tb_port * port,int cm_id)2316 int usb4_dp_port_set_cm_id(struct tb_port *port, int cm_id)
2317 {
2318 u32 val;
2319 int ret;
2320
2321 if (!is_usb4_dpin(port))
2322 return -EOPNOTSUPP;
2323
2324 ret = tb_port_read(port, &val, TB_CFG_PORT,
2325 port->cap_adap + ADP_DP_CS_2, 1);
2326 if (ret)
2327 return ret;
2328
2329 val &= ~ADP_DP_CS_2_CM_ID_MASK;
2330 val |= cm_id << ADP_DP_CS_2_CM_ID_SHIFT;
2331
2332 return tb_port_write(port, &val, TB_CFG_PORT,
2333 port->cap_adap + ADP_DP_CS_2, 1);
2334 }
2335
2336 /**
2337 * usb4_dp_port_bandwidth_mode_supported() - Is the bandwidth allocation mode
2338 * supported
2339 * @port: DP IN adapter to check
2340 *
2341 * Can be called to any DP IN adapter. Returns true if the adapter
2342 * supports USB4 bandwidth allocation mode, false otherwise.
2343 */
usb4_dp_port_bandwidth_mode_supported(struct tb_port * port)2344 bool usb4_dp_port_bandwidth_mode_supported(struct tb_port *port)
2345 {
2346 int ret;
2347 u32 val;
2348
2349 if (!is_usb4_dpin(port))
2350 return false;
2351
2352 ret = tb_port_read(port, &val, TB_CFG_PORT,
2353 port->cap_adap + DP_LOCAL_CAP, 1);
2354 if (ret)
2355 return false;
2356
2357 return !!(val & DP_COMMON_CAP_BW_MODE);
2358 }
2359
2360 /**
2361 * usb4_dp_port_bandwidth_mode_enabled() - Is the bandwidth allocation mode
2362 * enabled
2363 * @port: DP IN adapter to check
2364 *
2365 * Can be called to any DP IN adapter. Returns true if the bandwidth
2366 * allocation mode has been enabled, false otherwise.
2367 */
usb4_dp_port_bandwidth_mode_enabled(struct tb_port * port)2368 bool usb4_dp_port_bandwidth_mode_enabled(struct tb_port *port)
2369 {
2370 int ret;
2371 u32 val;
2372
2373 if (!is_usb4_dpin(port))
2374 return false;
2375
2376 ret = tb_port_read(port, &val, TB_CFG_PORT,
2377 port->cap_adap + ADP_DP_CS_8, 1);
2378 if (ret)
2379 return false;
2380
2381 return !!(val & ADP_DP_CS_8_DPME);
2382 }
2383
2384 /**
2385 * usb4_dp_port_set_cm_bandwidth_mode_supported() - Set/clear CM support for
2386 * bandwidth allocation mode
2387 * @port: DP IN adapter
2388 * @supported: Does the CM support bandwidth allocation mode
2389 *
2390 * Can be called to any DP IN adapter. Sets or clears the CM support bit
2391 * of the DP IN adapter. Returns %0 in success and negative errno
2392 * otherwise. Specifically returns %-OPNOTSUPP if the passed in adapter
2393 * does not support this.
2394 */
usb4_dp_port_set_cm_bandwidth_mode_supported(struct tb_port * port,bool supported)2395 int usb4_dp_port_set_cm_bandwidth_mode_supported(struct tb_port *port,
2396 bool supported)
2397 {
2398 u32 val;
2399 int ret;
2400
2401 if (!is_usb4_dpin(port))
2402 return -EOPNOTSUPP;
2403
2404 ret = tb_port_read(port, &val, TB_CFG_PORT,
2405 port->cap_adap + ADP_DP_CS_2, 1);
2406 if (ret)
2407 return ret;
2408
2409 if (supported)
2410 val |= ADP_DP_CS_2_CMMS;
2411 else
2412 val &= ~ADP_DP_CS_2_CMMS;
2413
2414 return tb_port_write(port, &val, TB_CFG_PORT,
2415 port->cap_adap + ADP_DP_CS_2, 1);
2416 }
2417
2418 /**
2419 * usb4_dp_port_group_id() - Return Group ID assigned for the adapter
2420 * @port: DP IN adapter
2421 *
2422 * Reads bandwidth allocation Group ID from the DP IN adapter and
2423 * returns it. If the adapter does not support setting Group_ID
2424 * %-EOPNOTSUPP is returned.
2425 */
usb4_dp_port_group_id(struct tb_port * port)2426 int usb4_dp_port_group_id(struct tb_port *port)
2427 {
2428 u32 val;
2429 int ret;
2430
2431 if (!is_usb4_dpin(port))
2432 return -EOPNOTSUPP;
2433
2434 ret = tb_port_read(port, &val, TB_CFG_PORT,
2435 port->cap_adap + ADP_DP_CS_2, 1);
2436 if (ret)
2437 return ret;
2438
2439 return (val & ADP_DP_CS_2_GROUP_ID_MASK) >> ADP_DP_CS_2_GROUP_ID_SHIFT;
2440 }
2441
2442 /**
2443 * usb4_dp_port_set_group_id() - Set adapter Group ID
2444 * @port: DP IN adapter
2445 * @group_id: Group ID for the adapter
2446 *
2447 * Sets bandwidth allocation mode Group ID for the DP IN adapter.
2448 * Returns %0 in case of success and negative errno otherwise.
2449 * Specifically returns %-EOPNOTSUPP if the adapter does not support
2450 * this.
2451 */
usb4_dp_port_set_group_id(struct tb_port * port,int group_id)2452 int usb4_dp_port_set_group_id(struct tb_port *port, int group_id)
2453 {
2454 u32 val;
2455 int ret;
2456
2457 if (!is_usb4_dpin(port))
2458 return -EOPNOTSUPP;
2459
2460 ret = tb_port_read(port, &val, TB_CFG_PORT,
2461 port->cap_adap + ADP_DP_CS_2, 1);
2462 if (ret)
2463 return ret;
2464
2465 val &= ~ADP_DP_CS_2_GROUP_ID_MASK;
2466 val |= group_id << ADP_DP_CS_2_GROUP_ID_SHIFT;
2467
2468 return tb_port_write(port, &val, TB_CFG_PORT,
2469 port->cap_adap + ADP_DP_CS_2, 1);
2470 }
2471
2472 /**
2473 * usb4_dp_port_nrd() - Read non-reduced rate and lanes
2474 * @port: DP IN adapter
2475 * @rate: Non-reduced rate in Mb/s is placed here
2476 * @lanes: Non-reduced lanes are placed here
2477 *
2478 * Reads the non-reduced rate and lanes from the DP IN adapter. Returns
2479 * %0 in success and negative errno otherwise. Specifically returns
2480 * %-EOPNOTSUPP if the adapter does not support this.
2481 */
usb4_dp_port_nrd(struct tb_port * port,int * rate,int * lanes)2482 int usb4_dp_port_nrd(struct tb_port *port, int *rate, int *lanes)
2483 {
2484 u32 val, tmp;
2485 int ret;
2486
2487 if (!is_usb4_dpin(port))
2488 return -EOPNOTSUPP;
2489
2490 ret = tb_port_read(port, &val, TB_CFG_PORT,
2491 port->cap_adap + ADP_DP_CS_2, 1);
2492 if (ret)
2493 return ret;
2494
2495 tmp = (val & ADP_DP_CS_2_NRD_MLR_MASK) >> ADP_DP_CS_2_NRD_MLR_SHIFT;
2496 switch (tmp) {
2497 case DP_COMMON_CAP_RATE_RBR:
2498 *rate = 1620;
2499 break;
2500 case DP_COMMON_CAP_RATE_HBR:
2501 *rate = 2700;
2502 break;
2503 case DP_COMMON_CAP_RATE_HBR2:
2504 *rate = 5400;
2505 break;
2506 case DP_COMMON_CAP_RATE_HBR3:
2507 *rate = 8100;
2508 break;
2509 }
2510
2511 tmp = val & ADP_DP_CS_2_NRD_MLC_MASK;
2512 switch (tmp) {
2513 case DP_COMMON_CAP_1_LANE:
2514 *lanes = 1;
2515 break;
2516 case DP_COMMON_CAP_2_LANES:
2517 *lanes = 2;
2518 break;
2519 case DP_COMMON_CAP_4_LANES:
2520 *lanes = 4;
2521 break;
2522 }
2523
2524 return 0;
2525 }
2526
2527 /**
2528 * usb4_dp_port_set_nrd() - Set non-reduced rate and lanes
2529 * @port: DP IN adapter
2530 * @rate: Non-reduced rate in Mb/s
2531 * @lanes: Non-reduced lanes
2532 *
2533 * Before the capabilities reduction this function can be used to set
2534 * the non-reduced values for the DP IN adapter. Returns %0 in success
2535 * and negative errno otherwise. If the adapter does not support this
2536 * %-EOPNOTSUPP is returned.
2537 */
usb4_dp_port_set_nrd(struct tb_port * port,int rate,int lanes)2538 int usb4_dp_port_set_nrd(struct tb_port *port, int rate, int lanes)
2539 {
2540 u32 val;
2541 int ret;
2542
2543 if (!is_usb4_dpin(port))
2544 return -EOPNOTSUPP;
2545
2546 ret = tb_port_read(port, &val, TB_CFG_PORT,
2547 port->cap_adap + ADP_DP_CS_2, 1);
2548 if (ret)
2549 return ret;
2550
2551 val &= ~ADP_DP_CS_2_NRD_MLR_MASK;
2552
2553 switch (rate) {
2554 case 1620:
2555 break;
2556 case 2700:
2557 val |= (DP_COMMON_CAP_RATE_HBR << ADP_DP_CS_2_NRD_MLR_SHIFT)
2558 & ADP_DP_CS_2_NRD_MLR_MASK;
2559 break;
2560 case 5400:
2561 val |= (DP_COMMON_CAP_RATE_HBR2 << ADP_DP_CS_2_NRD_MLR_SHIFT)
2562 & ADP_DP_CS_2_NRD_MLR_MASK;
2563 break;
2564 case 8100:
2565 val |= (DP_COMMON_CAP_RATE_HBR3 << ADP_DP_CS_2_NRD_MLR_SHIFT)
2566 & ADP_DP_CS_2_NRD_MLR_MASK;
2567 break;
2568 default:
2569 return -EINVAL;
2570 }
2571
2572 val &= ~ADP_DP_CS_2_NRD_MLC_MASK;
2573
2574 switch (lanes) {
2575 case 1:
2576 break;
2577 case 2:
2578 val |= DP_COMMON_CAP_2_LANES;
2579 break;
2580 case 4:
2581 val |= DP_COMMON_CAP_4_LANES;
2582 break;
2583 default:
2584 return -EINVAL;
2585 }
2586
2587 return tb_port_write(port, &val, TB_CFG_PORT,
2588 port->cap_adap + ADP_DP_CS_2, 1);
2589 }
2590
2591 /**
2592 * usb4_dp_port_granularity() - Return granularity for the bandwidth values
2593 * @port: DP IN adapter
2594 *
2595 * Reads the programmed granularity from @port. If the DP IN adapter does
2596 * not support bandwidth allocation mode returns %-EOPNOTSUPP and negative
2597 * errno in other error cases.
2598 */
usb4_dp_port_granularity(struct tb_port * port)2599 int usb4_dp_port_granularity(struct tb_port *port)
2600 {
2601 u32 val;
2602 int ret;
2603
2604 if (!is_usb4_dpin(port))
2605 return -EOPNOTSUPP;
2606
2607 ret = tb_port_read(port, &val, TB_CFG_PORT,
2608 port->cap_adap + ADP_DP_CS_2, 1);
2609 if (ret)
2610 return ret;
2611
2612 val &= ADP_DP_CS_2_GR_MASK;
2613 val >>= ADP_DP_CS_2_GR_SHIFT;
2614
2615 switch (val) {
2616 case ADP_DP_CS_2_GR_0_25G:
2617 return 250;
2618 case ADP_DP_CS_2_GR_0_5G:
2619 return 500;
2620 case ADP_DP_CS_2_GR_1G:
2621 return 1000;
2622 }
2623
2624 return -EINVAL;
2625 }
2626
2627 /**
2628 * usb4_dp_port_set_granularity() - Set granularity for the bandwidth values
2629 * @port: DP IN adapter
2630 * @granularity: Granularity in Mb/s. Supported values: 1000, 500 and 250.
2631 *
2632 * Sets the granularity used with the estimated, allocated and requested
2633 * bandwidth. Returns %0 in success and negative errno otherwise. If the
2634 * adapter does not support this %-EOPNOTSUPP is returned.
2635 */
usb4_dp_port_set_granularity(struct tb_port * port,int granularity)2636 int usb4_dp_port_set_granularity(struct tb_port *port, int granularity)
2637 {
2638 u32 val;
2639 int ret;
2640
2641 if (!is_usb4_dpin(port))
2642 return -EOPNOTSUPP;
2643
2644 ret = tb_port_read(port, &val, TB_CFG_PORT,
2645 port->cap_adap + ADP_DP_CS_2, 1);
2646 if (ret)
2647 return ret;
2648
2649 val &= ~ADP_DP_CS_2_GR_MASK;
2650
2651 switch (granularity) {
2652 case 250:
2653 val |= ADP_DP_CS_2_GR_0_25G << ADP_DP_CS_2_GR_SHIFT;
2654 break;
2655 case 500:
2656 val |= ADP_DP_CS_2_GR_0_5G << ADP_DP_CS_2_GR_SHIFT;
2657 break;
2658 case 1000:
2659 val |= ADP_DP_CS_2_GR_1G << ADP_DP_CS_2_GR_SHIFT;
2660 break;
2661 default:
2662 return -EINVAL;
2663 }
2664
2665 return tb_port_write(port, &val, TB_CFG_PORT,
2666 port->cap_adap + ADP_DP_CS_2, 1);
2667 }
2668
2669 /**
2670 * usb4_dp_port_set_estimated_bandwidth() - Set estimated bandwidth
2671 * @port: DP IN adapter
2672 * @bw: Estimated bandwidth in Mb/s.
2673 *
2674 * Sets the estimated bandwidth to @bw. Set the granularity by calling
2675 * usb4_dp_port_set_granularity() before calling this. The @bw is round
2676 * down to the closest granularity multiplier. Returns %0 in success
2677 * and negative errno otherwise. Specifically returns %-EOPNOTSUPP if
2678 * the adapter does not support this.
2679 */
usb4_dp_port_set_estimated_bandwidth(struct tb_port * port,int bw)2680 int usb4_dp_port_set_estimated_bandwidth(struct tb_port *port, int bw)
2681 {
2682 u32 val, granularity;
2683 int ret;
2684
2685 if (!is_usb4_dpin(port))
2686 return -EOPNOTSUPP;
2687
2688 ret = usb4_dp_port_granularity(port);
2689 if (ret < 0)
2690 return ret;
2691 granularity = ret;
2692
2693 ret = tb_port_read(port, &val, TB_CFG_PORT,
2694 port->cap_adap + ADP_DP_CS_2, 1);
2695 if (ret)
2696 return ret;
2697
2698 val &= ~ADP_DP_CS_2_ESTIMATED_BW_MASK;
2699 val |= (bw / granularity) << ADP_DP_CS_2_ESTIMATED_BW_SHIFT;
2700
2701 return tb_port_write(port, &val, TB_CFG_PORT,
2702 port->cap_adap + ADP_DP_CS_2, 1);
2703 }
2704
2705 /**
2706 * usb4_dp_port_allocated_bandwidth() - Return allocated bandwidth
2707 * @port: DP IN adapter
2708 *
2709 * Reads and returns allocated bandwidth for @port in Mb/s (taking into
2710 * account the programmed granularity). Returns negative errno in case
2711 * of error.
2712 */
usb4_dp_port_allocated_bandwidth(struct tb_port * port)2713 int usb4_dp_port_allocated_bandwidth(struct tb_port *port)
2714 {
2715 u32 val, granularity;
2716 int ret;
2717
2718 if (!is_usb4_dpin(port))
2719 return -EOPNOTSUPP;
2720
2721 ret = usb4_dp_port_granularity(port);
2722 if (ret < 0)
2723 return ret;
2724 granularity = ret;
2725
2726 ret = tb_port_read(port, &val, TB_CFG_PORT,
2727 port->cap_adap + DP_STATUS, 1);
2728 if (ret)
2729 return ret;
2730
2731 val &= DP_STATUS_ALLOCATED_BW_MASK;
2732 val >>= DP_STATUS_ALLOCATED_BW_SHIFT;
2733
2734 return val * granularity;
2735 }
2736
__usb4_dp_port_set_cm_ack(struct tb_port * port,bool ack)2737 static int __usb4_dp_port_set_cm_ack(struct tb_port *port, bool ack)
2738 {
2739 u32 val;
2740 int ret;
2741
2742 ret = tb_port_read(port, &val, TB_CFG_PORT,
2743 port->cap_adap + ADP_DP_CS_2, 1);
2744 if (ret)
2745 return ret;
2746
2747 if (ack)
2748 val |= ADP_DP_CS_2_CA;
2749 else
2750 val &= ~ADP_DP_CS_2_CA;
2751
2752 return tb_port_write(port, &val, TB_CFG_PORT,
2753 port->cap_adap + ADP_DP_CS_2, 1);
2754 }
2755
usb4_dp_port_set_cm_ack(struct tb_port * port)2756 static inline int usb4_dp_port_set_cm_ack(struct tb_port *port)
2757 {
2758 return __usb4_dp_port_set_cm_ack(port, true);
2759 }
2760
usb4_dp_port_wait_and_clear_cm_ack(struct tb_port * port,int timeout_msec)2761 static int usb4_dp_port_wait_and_clear_cm_ack(struct tb_port *port,
2762 int timeout_msec)
2763 {
2764 ktime_t end;
2765 u32 val;
2766 int ret;
2767
2768 ret = __usb4_dp_port_set_cm_ack(port, false);
2769 if (ret)
2770 return ret;
2771
2772 end = ktime_add_ms(ktime_get(), timeout_msec);
2773 do {
2774 ret = tb_port_read(port, &val, TB_CFG_PORT,
2775 port->cap_adap + ADP_DP_CS_8, 1);
2776 if (ret)
2777 return ret;
2778
2779 if (!(val & ADP_DP_CS_8_DR))
2780 break;
2781
2782 usleep_range(50, 100);
2783 } while (ktime_before(ktime_get(), end));
2784
2785 if (val & ADP_DP_CS_8_DR)
2786 return -ETIMEDOUT;
2787
2788 ret = tb_port_read(port, &val, TB_CFG_PORT,
2789 port->cap_adap + ADP_DP_CS_2, 1);
2790 if (ret)
2791 return ret;
2792
2793 val &= ~ADP_DP_CS_2_CA;
2794 return tb_port_write(port, &val, TB_CFG_PORT,
2795 port->cap_adap + ADP_DP_CS_2, 1);
2796 }
2797
2798 /**
2799 * usb4_dp_port_allocate_bandwidth() - Set allocated bandwidth
2800 * @port: DP IN adapter
2801 * @bw: New allocated bandwidth in Mb/s
2802 *
2803 * Communicates the new allocated bandwidth with the DPCD (graphics
2804 * driver). Takes into account the programmed granularity. Returns %0 in
2805 * success and negative errno in case of error.
2806 */
usb4_dp_port_allocate_bandwidth(struct tb_port * port,int bw)2807 int usb4_dp_port_allocate_bandwidth(struct tb_port *port, int bw)
2808 {
2809 u32 val, granularity;
2810 int ret;
2811
2812 if (!is_usb4_dpin(port))
2813 return -EOPNOTSUPP;
2814
2815 ret = usb4_dp_port_granularity(port);
2816 if (ret < 0)
2817 return ret;
2818 granularity = ret;
2819
2820 ret = tb_port_read(port, &val, TB_CFG_PORT,
2821 port->cap_adap + DP_STATUS, 1);
2822 if (ret)
2823 return ret;
2824
2825 val &= ~DP_STATUS_ALLOCATED_BW_MASK;
2826 val |= (bw / granularity) << DP_STATUS_ALLOCATED_BW_SHIFT;
2827
2828 ret = tb_port_write(port, &val, TB_CFG_PORT,
2829 port->cap_adap + DP_STATUS, 1);
2830 if (ret)
2831 return ret;
2832
2833 ret = usb4_dp_port_set_cm_ack(port);
2834 if (ret)
2835 return ret;
2836
2837 return usb4_dp_port_wait_and_clear_cm_ack(port, 500);
2838 }
2839
2840 /**
2841 * usb4_dp_port_requested_bandwidth() - Read requested bandwidth
2842 * @port: DP IN adapter
2843 *
2844 * Reads the DPCD (graphics driver) requested bandwidth and returns it
2845 * in Mb/s. Takes the programmed granularity into account. In case of
2846 * error returns negative errno. Specifically returns %-EOPNOTSUPP if
2847 * the adapter does not support bandwidth allocation mode, and %ENODATA
2848 * if there is no active bandwidth request from the graphics driver.
2849 */
usb4_dp_port_requested_bandwidth(struct tb_port * port)2850 int usb4_dp_port_requested_bandwidth(struct tb_port *port)
2851 {
2852 u32 val, granularity;
2853 int ret;
2854
2855 if (!is_usb4_dpin(port))
2856 return -EOPNOTSUPP;
2857
2858 ret = usb4_dp_port_granularity(port);
2859 if (ret < 0)
2860 return ret;
2861 granularity = ret;
2862
2863 ret = tb_port_read(port, &val, TB_CFG_PORT,
2864 port->cap_adap + ADP_DP_CS_8, 1);
2865 if (ret)
2866 return ret;
2867
2868 if (!(val & ADP_DP_CS_8_DR))
2869 return -ENODATA;
2870
2871 return (val & ADP_DP_CS_8_REQUESTED_BW_MASK) * granularity;
2872 }
2873
2874 /**
2875 * usb4_pci_port_set_ext_encapsulation() - Enable/disable extended encapsulation
2876 * @port: PCIe adapter
2877 * @enable: Enable/disable extended encapsulation
2878 *
2879 * Enables or disables extended encapsulation used in PCIe tunneling. Caller
2880 * needs to make sure both adapters support this before enabling. Returns %0 on
2881 * success and negative errno otherwise.
2882 */
usb4_pci_port_set_ext_encapsulation(struct tb_port * port,bool enable)2883 int usb4_pci_port_set_ext_encapsulation(struct tb_port *port, bool enable)
2884 {
2885 u32 val;
2886 int ret;
2887
2888 if (!tb_port_is_pcie_up(port) && !tb_port_is_pcie_down(port))
2889 return -EINVAL;
2890
2891 ret = tb_port_read(port, &val, TB_CFG_PORT,
2892 port->cap_adap + ADP_PCIE_CS_1, 1);
2893 if (ret)
2894 return ret;
2895
2896 if (enable)
2897 val |= ADP_PCIE_CS_1_EE;
2898 else
2899 val &= ~ADP_PCIE_CS_1_EE;
2900
2901 return tb_port_write(port, &val, TB_CFG_PORT,
2902 port->cap_adap + ADP_PCIE_CS_1, 1);
2903 }
2904