1 // SPDX-License-Identifier: GPL-2.0
3 * Thunderbolt driver - switch/port utility functions
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2018, Intel Corporation
9 #include <linux/delay.h>
10 #include <linux/idr.h>
11 #include <linux/nvmem-provider.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/sched/signal.h>
14 #include <linux/sizes.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
20 /* Switch NVM support */
24 struct nvm_auth_status {
25 struct list_head list;
30 static bool clx_enabled = true;
31 module_param_named(clx, clx_enabled, bool, 0444);
32 MODULE_PARM_DESC(clx, "allow low power states on the high-speed lanes (default: true)");
35 * Hold NVM authentication failure status per switch This information
36 * needs to stay around even when the switch gets power cycled so we
39 static LIST_HEAD(nvm_auth_status_cache);
40 static DEFINE_MUTEX(nvm_auth_status_lock);
42 static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
44 struct nvm_auth_status *st;
46 list_for_each_entry(st, &nvm_auth_status_cache, list) {
47 if (uuid_equal(&st->uuid, sw->uuid))
54 static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
56 struct nvm_auth_status *st;
58 mutex_lock(&nvm_auth_status_lock);
59 st = __nvm_get_auth_status(sw);
60 mutex_unlock(&nvm_auth_status_lock);
62 *status = st ? st->status : 0;
65 static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
67 struct nvm_auth_status *st;
69 if (WARN_ON(!sw->uuid))
72 mutex_lock(&nvm_auth_status_lock);
73 st = __nvm_get_auth_status(sw);
76 st = kzalloc(sizeof(*st), GFP_KERNEL);
80 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
81 INIT_LIST_HEAD(&st->list);
82 list_add_tail(&st->list, &nvm_auth_status_cache);
87 mutex_unlock(&nvm_auth_status_lock);
90 static void nvm_clear_auth_status(const struct tb_switch *sw)
92 struct nvm_auth_status *st;
94 mutex_lock(&nvm_auth_status_lock);
95 st = __nvm_get_auth_status(sw);
100 mutex_unlock(&nvm_auth_status_lock);
103 static int nvm_validate_and_write(struct tb_switch *sw)
105 unsigned int image_size, hdr_size;
106 const u8 *buf = sw->nvm->buf;
113 image_size = sw->nvm->buf_data_size;
114 if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
118 * FARB pointer must point inside the image and must at least
119 * contain parts of the digital section we will be reading here.
121 hdr_size = (*(u32 *)buf) & 0xffffff;
122 if (hdr_size + NVM_DEVID + 2 >= image_size)
125 /* Digital section start should be aligned to 4k page */
126 if (!IS_ALIGNED(hdr_size, SZ_4K))
130 * Read digital section size and check that it also fits inside
133 ds_size = *(u16 *)(buf + hdr_size);
134 if (ds_size >= image_size)
137 if (!sw->safe_mode) {
141 * Make sure the device ID in the image matches the one
142 * we read from the switch config space.
144 device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
145 if (device_id != sw->config.device_id)
148 if (sw->generation < 3) {
149 /* Write CSS headers first */
150 ret = dma_port_flash_write(sw->dma_port,
151 DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
152 DMA_PORT_CSS_MAX_SIZE);
157 /* Skip headers in the image */
159 image_size -= hdr_size;
162 if (tb_switch_is_usb4(sw))
163 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
165 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
167 sw->nvm->flushed = true;
171 static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
176 * Root switch NVM upgrade requires that we disconnect the
177 * existing paths first (in case it is not in safe mode
180 if (!sw->safe_mode) {
183 ret = tb_domain_disconnect_all_paths(sw->tb);
187 * The host controller goes away pretty soon after this if
188 * everything goes well so getting timeout is expected.
190 ret = dma_port_flash_update_auth(sw->dma_port);
191 if (!ret || ret == -ETIMEDOUT)
195 * Any error from update auth operation requires power
196 * cycling of the host router.
198 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
199 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
200 nvm_set_auth_status(sw, status);
204 * From safe mode we can get out by just power cycling the
207 dma_port_power_cycle(sw->dma_port);
211 static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
213 int ret, retries = 10;
215 ret = dma_port_flash_update_auth(sw->dma_port);
221 /* Power cycle is required */
228 * Poll here for the authentication status. It takes some time
229 * for the device to respond (we get timeout for a while). Once
230 * we get response the device needs to be power cycled in order
231 * to the new NVM to be taken into use.
236 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
237 if (ret < 0 && ret != -ETIMEDOUT)
241 tb_sw_warn(sw, "failed to authenticate NVM\n");
242 nvm_set_auth_status(sw, status);
245 tb_sw_info(sw, "power cycling the switch now\n");
246 dma_port_power_cycle(sw->dma_port);
256 static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
258 struct pci_dev *root_port;
261 * During host router NVM upgrade we should not allow root port to
262 * go into D3cold because some root ports cannot trigger PME
263 * itself. To be on the safe side keep the root port in D0 during
264 * the whole upgrade process.
266 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
268 pm_runtime_get_noresume(&root_port->dev);
271 static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
273 struct pci_dev *root_port;
275 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
277 pm_runtime_put(&root_port->dev);
280 static inline bool nvm_readable(struct tb_switch *sw)
282 if (tb_switch_is_usb4(sw)) {
284 * USB4 devices must support NVM operations but it is
285 * optional for hosts. Therefore we query the NVM sector
286 * size here and if it is supported assume NVM
287 * operations are implemented.
289 return usb4_switch_nvm_sector_size(sw) > 0;
292 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
293 return !!sw->dma_port;
296 static inline bool nvm_upgradeable(struct tb_switch *sw)
298 if (sw->no_nvm_upgrade)
300 return nvm_readable(sw);
303 static inline int nvm_read(struct tb_switch *sw, unsigned int address,
304 void *buf, size_t size)
306 if (tb_switch_is_usb4(sw))
307 return usb4_switch_nvm_read(sw, address, buf, size);
308 return dma_port_flash_read(sw->dma_port, address, buf, size);
311 static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
315 if (tb_switch_is_usb4(sw)) {
317 ret = usb4_switch_nvm_set_offset(sw, 0);
321 sw->nvm->authenticating = true;
322 return usb4_switch_nvm_authenticate(sw);
323 } else if (auth_only) {
327 sw->nvm->authenticating = true;
329 nvm_authenticate_start_dma_port(sw);
330 ret = nvm_authenticate_host_dma_port(sw);
332 ret = nvm_authenticate_device_dma_port(sw);
338 static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
341 struct tb_nvm *nvm = priv;
342 struct tb_switch *sw = tb_to_switch(nvm->dev);
345 pm_runtime_get_sync(&sw->dev);
347 if (!mutex_trylock(&sw->tb->lock)) {
348 ret = restart_syscall();
352 ret = nvm_read(sw, offset, val, bytes);
353 mutex_unlock(&sw->tb->lock);
356 pm_runtime_mark_last_busy(&sw->dev);
357 pm_runtime_put_autosuspend(&sw->dev);
362 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
365 struct tb_nvm *nvm = priv;
366 struct tb_switch *sw = tb_to_switch(nvm->dev);
369 if (!mutex_trylock(&sw->tb->lock))
370 return restart_syscall();
373 * Since writing the NVM image might require some special steps,
374 * for example when CSS headers are written, we cache the image
375 * locally here and handle the special cases when the user asks
376 * us to authenticate the image.
378 ret = tb_nvm_write_buf(nvm, offset, val, bytes);
379 mutex_unlock(&sw->tb->lock);
384 static int tb_switch_nvm_add(struct tb_switch *sw)
390 if (!nvm_readable(sw))
394 * The NVM format of non-Intel hardware is not known so
395 * currently restrict NVM upgrade for Intel hardware. We may
396 * relax this in the future when we learn other NVM formats.
398 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL &&
399 sw->config.vendor_id != 0x8087) {
401 "NVM format of vendor %#x is not known, disabling NVM upgrade\n",
402 sw->config.vendor_id);
406 nvm = tb_nvm_alloc(&sw->dev);
411 * If the switch is in safe-mode the only accessible portion of
412 * the NVM is the non-active one where userspace is expected to
413 * write new functional NVM.
415 if (!sw->safe_mode) {
416 u32 nvm_size, hdr_size;
418 ret = nvm_read(sw, NVM_FLASH_SIZE, &val, sizeof(val));
422 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
423 nvm_size = (SZ_1M << (val & 7)) / 8;
424 nvm_size = (nvm_size - hdr_size) / 2;
426 ret = nvm_read(sw, NVM_VERSION, &val, sizeof(val));
430 nvm->major = val >> 16;
431 nvm->minor = val >> 8;
433 ret = tb_nvm_add_active(nvm, nvm_size, tb_switch_nvm_read);
438 if (!sw->no_nvm_upgrade) {
439 ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE,
440 tb_switch_nvm_write);
453 static void tb_switch_nvm_remove(struct tb_switch *sw)
463 /* Remove authentication status in case the switch is unplugged */
464 if (!nvm->authenticating)
465 nvm_clear_auth_status(sw);
470 /* port utility functions */
472 static const char *tb_port_type(const struct tb_regs_port_header *port)
474 switch (port->type >> 16) {
476 switch ((u8) port->type) {
501 static void tb_dump_port(struct tb *tb, const struct tb_port *port)
503 const struct tb_regs_port_header *regs = &port->config;
506 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
507 regs->port_number, regs->vendor_id, regs->device_id,
508 regs->revision, regs->thunderbolt_version, tb_port_type(regs),
510 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
511 regs->max_in_hop_id, regs->max_out_hop_id);
512 tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
513 tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
514 tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
519 * tb_port_state() - get connectedness state of a port
520 * @port: the port to check
522 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
524 * Return: Returns an enum tb_port_state on success or an error code on failure.
526 int tb_port_state(struct tb_port *port)
528 struct tb_cap_phy phy;
530 if (port->cap_phy == 0) {
531 tb_port_WARN(port, "does not have a PHY\n");
534 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
541 * tb_wait_for_port() - wait for a port to become ready
542 * @port: Port to wait
543 * @wait_if_unplugged: Wait also when port is unplugged
545 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
546 * wait_if_unplugged is set then we also wait if the port is in state
547 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
548 * switch resume). Otherwise we only wait if a device is registered but the link
549 * has not yet been established.
551 * Return: Returns an error code on failure. Returns 0 if the port is not
552 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
553 * if the port is connected and in state TB_PORT_UP.
555 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
559 if (!port->cap_phy) {
560 tb_port_WARN(port, "does not have PHY\n");
563 if (tb_is_upstream_port(port)) {
564 tb_port_WARN(port, "is the upstream port\n");
569 state = tb_port_state(port);
572 if (state == TB_PORT_DISABLED) {
573 tb_port_dbg(port, "is disabled (state: 0)\n");
576 if (state == TB_PORT_UNPLUGGED) {
577 if (wait_if_unplugged) {
578 /* used during resume */
580 "is unplugged (state: 7), retrying...\n");
584 tb_port_dbg(port, "is unplugged (state: 7)\n");
587 if (state == TB_PORT_UP) {
588 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
593 * After plug-in the state is TB_PORT_CONNECTING. Give it some
597 "is connected, link is not up (state: %d), retrying...\n",
602 "failed to reach state TB_PORT_UP. Ignoring port...\n");
607 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
608 * @port: Port to add/remove NFC credits
609 * @credits: Credits to add/remove
611 * Change the number of NFC credits allocated to @port by @credits. To remove
612 * NFC credits pass a negative amount of credits.
614 * Return: Returns 0 on success or an error code on failure.
616 int tb_port_add_nfc_credits(struct tb_port *port, int credits)
620 if (credits == 0 || port->sw->is_unplugged)
624 * USB4 restricts programming NFC buffers to lane adapters only
625 * so skip other ports.
627 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
630 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
632 credits = max_t(int, -nfc_credits, credits);
634 nfc_credits += credits;
636 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
637 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
639 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
640 port->config.nfc_credits |= nfc_credits;
642 return tb_port_write(port, &port->config.nfc_credits,
643 TB_CFG_PORT, ADP_CS_4, 1);
647 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
648 * @port: Port whose counters to clear
649 * @counter: Counter index to clear
651 * Return: Returns 0 on success or an error code on failure.
653 int tb_port_clear_counter(struct tb_port *port, int counter)
655 u32 zero[3] = { 0, 0, 0 };
656 tb_port_dbg(port, "clearing counter %d\n", counter);
657 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
661 * tb_port_unlock() - Unlock downstream port
662 * @port: Port to unlock
664 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
665 * downstream router accessible for CM.
667 int tb_port_unlock(struct tb_port *port)
669 if (tb_switch_is_icm(port->sw))
671 if (!tb_port_is_null(port))
673 if (tb_switch_is_usb4(port->sw))
674 return usb4_port_unlock(port);
678 static int __tb_port_enable(struct tb_port *port, bool enable)
683 if (!tb_port_is_null(port))
686 ret = tb_port_read(port, &phy, TB_CFG_PORT,
687 port->cap_phy + LANE_ADP_CS_1, 1);
692 phy &= ~LANE_ADP_CS_1_LD;
694 phy |= LANE_ADP_CS_1_LD;
696 return tb_port_write(port, &phy, TB_CFG_PORT,
697 port->cap_phy + LANE_ADP_CS_1, 1);
701 * tb_port_enable() - Enable lane adapter
702 * @port: Port to enable (can be %NULL)
704 * This is used for lane 0 and 1 adapters to enable it.
706 int tb_port_enable(struct tb_port *port)
708 return __tb_port_enable(port, true);
712 * tb_port_disable() - Disable lane adapter
713 * @port: Port to disable (can be %NULL)
715 * This is used for lane 0 and 1 adapters to disable it.
717 int tb_port_disable(struct tb_port *port)
719 return __tb_port_enable(port, false);
723 * tb_init_port() - initialize a port
725 * This is a helper method for tb_switch_alloc. Does not check or initialize
726 * any downstream switches.
728 * Return: Returns 0 on success or an error code on failure.
730 static int tb_init_port(struct tb_port *port)
735 INIT_LIST_HEAD(&port->list);
737 /* Control adapter does not have configuration space */
741 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
743 if (res == -ENODEV) {
744 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
746 port->disabled = true;
752 /* Port 0 is the switch itself and has no PHY. */
753 if (port->config.type == TB_TYPE_PORT) {
754 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
759 tb_port_WARN(port, "non switch port without a PHY\n");
761 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
763 port->cap_usb4 = cap;
766 * USB4 ports the buffers allocated for the control path
767 * can be read from the path config space. Legacy
768 * devices we use hard-coded value.
770 if (tb_switch_is_usb4(port->sw)) {
771 struct tb_regs_hop hop;
773 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
774 port->ctl_credits = hop.initial_credits;
776 if (!port->ctl_credits)
777 port->ctl_credits = 2;
780 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
782 port->cap_adap = cap;
785 port->total_credits =
786 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
787 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
789 tb_dump_port(port->sw->tb, port);
793 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
800 port_max_hopid = port->config.max_in_hop_id;
801 ida = &port->in_hopids;
803 port_max_hopid = port->config.max_out_hop_id;
804 ida = &port->out_hopids;
808 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
811 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
812 min_hopid = TB_PATH_MIN_HOPID;
814 if (max_hopid < 0 || max_hopid > port_max_hopid)
815 max_hopid = port_max_hopid;
817 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
821 * tb_port_alloc_in_hopid() - Allocate input HopID from port
822 * @port: Port to allocate HopID for
823 * @min_hopid: Minimum acceptable input HopID
824 * @max_hopid: Maximum acceptable input HopID
826 * Return: HopID between @min_hopid and @max_hopid or negative errno in
829 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
831 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
835 * tb_port_alloc_out_hopid() - Allocate output HopID from port
836 * @port: Port to allocate HopID for
837 * @min_hopid: Minimum acceptable output HopID
838 * @max_hopid: Maximum acceptable output HopID
840 * Return: HopID between @min_hopid and @max_hopid or negative errno in
843 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
845 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
849 * tb_port_release_in_hopid() - Release allocated input HopID from port
850 * @port: Port whose HopID to release
851 * @hopid: HopID to release
853 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
855 ida_simple_remove(&port->in_hopids, hopid);
859 * tb_port_release_out_hopid() - Release allocated output HopID from port
860 * @port: Port whose HopID to release
861 * @hopid: HopID to release
863 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
865 ida_simple_remove(&port->out_hopids, hopid);
868 static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
869 const struct tb_switch *sw)
871 u64 mask = (1ULL << parent->config.depth * 8) - 1;
872 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
876 * tb_next_port_on_path() - Return next port for given port on a path
877 * @start: Start port of the walk
878 * @end: End port of the walk
879 * @prev: Previous port (%NULL if this is the first)
881 * This function can be used to walk from one port to another if they
882 * are connected through zero or more switches. If the @prev is dual
883 * link port, the function follows that link and returns another end on
886 * If the @end port has been reached, return %NULL.
888 * Domain tb->lock must be held when this function is called.
890 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
891 struct tb_port *prev)
893 struct tb_port *next;
898 if (prev->sw == end->sw) {
904 if (tb_switch_is_reachable(prev->sw, end->sw)) {
905 next = tb_port_at(tb_route(end->sw), prev->sw);
906 /* Walk down the topology if next == prev */
908 (next == prev || next->dual_link_port == prev))
911 if (tb_is_upstream_port(prev)) {
914 next = tb_upstream_port(prev->sw);
916 * Keep the same link if prev and next are both
919 if (next->dual_link_port &&
920 next->link_nr != prev->link_nr) {
921 next = next->dual_link_port;
926 return next != prev ? next : NULL;
930 * tb_port_get_link_speed() - Get current link speed
931 * @port: Port to check (USB4 or CIO)
933 * Returns link speed in Gb/s or negative errno in case of failure.
935 int tb_port_get_link_speed(struct tb_port *port)
943 ret = tb_port_read(port, &val, TB_CFG_PORT,
944 port->cap_phy + LANE_ADP_CS_1, 1);
948 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
949 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
950 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
954 * tb_port_get_link_width() - Get current link width
955 * @port: Port to check (USB4 or CIO)
957 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
958 * or negative errno in case of failure.
960 int tb_port_get_link_width(struct tb_port *port)
968 ret = tb_port_read(port, &val, TB_CFG_PORT,
969 port->cap_phy + LANE_ADP_CS_1, 1);
973 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
974 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
977 static bool tb_port_is_width_supported(struct tb_port *port, int width)
985 ret = tb_port_read(port, &phy, TB_CFG_PORT,
986 port->cap_phy + LANE_ADP_CS_0, 1);
990 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
991 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
993 return !!(widths & width);
996 static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
1004 ret = tb_port_read(port, &val, TB_CFG_PORT,
1005 port->cap_phy + LANE_ADP_CS_1, 1);
1009 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
1012 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
1013 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1016 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
1017 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1023 val |= LANE_ADP_CS_1_LB;
1025 return tb_port_write(port, &val, TB_CFG_PORT,
1026 port->cap_phy + LANE_ADP_CS_1, 1);
1030 * tb_port_lane_bonding_enable() - Enable bonding on port
1031 * @port: port to enable
1033 * Enable bonding by setting the link width of the port and the other
1034 * port in case of dual link port. Does not wait for the link to
1035 * actually reach the bonded state so caller needs to call
1036 * tb_port_wait_for_link_width() before enabling any paths through the
1037 * link to make sure the link is in expected state.
1039 * Return: %0 in case of success and negative errno in case of error
1041 int tb_port_lane_bonding_enable(struct tb_port *port)
1046 * Enable lane bonding for both links if not already enabled by
1047 * for example the boot firmware.
1049 ret = tb_port_get_link_width(port);
1051 ret = tb_port_set_link_width(port, 2);
1056 ret = tb_port_get_link_width(port->dual_link_port);
1058 ret = tb_port_set_link_width(port->dual_link_port, 2);
1060 tb_port_set_link_width(port, 1);
1065 port->bonded = true;
1066 port->dual_link_port->bonded = true;
1072 * tb_port_lane_bonding_disable() - Disable bonding on port
1073 * @port: port to disable
1075 * Disable bonding by setting the link width of the port and the
1076 * other port in case of dual link port.
1079 void tb_port_lane_bonding_disable(struct tb_port *port)
1081 port->dual_link_port->bonded = false;
1082 port->bonded = false;
1084 tb_port_set_link_width(port->dual_link_port, 1);
1085 tb_port_set_link_width(port, 1);
1089 * tb_port_wait_for_link_width() - Wait until link reaches specific width
1090 * @port: Port to wait for
1091 * @width: Expected link width (%1 or %2)
1092 * @timeout_msec: Timeout in ms how long to wait
1094 * Should be used after both ends of the link have been bonded (or
1095 * bonding has been disabled) to wait until the link actually reaches
1096 * the expected state. Returns %-ETIMEDOUT if the @width was not reached
1097 * within the given timeout, %0 if it did.
1099 int tb_port_wait_for_link_width(struct tb_port *port, int width,
1102 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1106 ret = tb_port_get_link_width(port);
1109 else if (ret == width)
1112 usleep_range(1000, 2000);
1113 } while (ktime_before(ktime_get(), timeout));
1118 static int tb_port_do_update_credits(struct tb_port *port)
1123 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
1127 if (nfc_credits != port->config.nfc_credits) {
1130 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
1131 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
1133 tb_port_dbg(port, "total credits changed %u -> %u\n",
1134 port->total_credits, total);
1136 port->config.nfc_credits = nfc_credits;
1137 port->total_credits = total;
1144 * tb_port_update_credits() - Re-read port total credits
1145 * @port: Port to update
1147 * After the link is bonded (or bonding was disabled) the port total
1148 * credits may change, so this function needs to be called to re-read
1149 * the credits. Updates also the second lane adapter.
1151 int tb_port_update_credits(struct tb_port *port)
1155 ret = tb_port_do_update_credits(port);
1158 return tb_port_do_update_credits(port->dual_link_port);
1161 static int tb_port_start_lane_initialization(struct tb_port *port)
1165 if (tb_switch_is_usb4(port->sw))
1168 ret = tb_lc_start_lane_initialization(port);
1169 return ret == -EINVAL ? 0 : ret;
1173 * Returns true if the port had something (router, XDomain) connected
1176 static bool tb_port_resume(struct tb_port *port)
1178 bool has_remote = tb_port_has_remote(port);
1181 usb4_port_device_resume(port->usb4);
1182 } else if (!has_remote) {
1184 * For disconnected downstream lane adapters start lane
1185 * initialization now so we detect future connects.
1187 * For XDomain start the lane initialzation now so the
1188 * link gets re-established.
1190 * This is only needed for non-USB4 ports.
1192 if (!tb_is_upstream_port(port) || port->xdomain)
1193 tb_port_start_lane_initialization(port);
1196 return has_remote || port->xdomain;
1200 * tb_port_is_enabled() - Is the adapter port enabled
1201 * @port: Port to check
1203 bool tb_port_is_enabled(struct tb_port *port)
1205 switch (port->config.type) {
1206 case TB_TYPE_PCIE_UP:
1207 case TB_TYPE_PCIE_DOWN:
1208 return tb_pci_port_is_enabled(port);
1210 case TB_TYPE_DP_HDMI_IN:
1211 case TB_TYPE_DP_HDMI_OUT:
1212 return tb_dp_port_is_enabled(port);
1214 case TB_TYPE_USB3_UP:
1215 case TB_TYPE_USB3_DOWN:
1216 return tb_usb3_port_is_enabled(port);
1224 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1225 * @port: USB3 adapter port to check
1227 bool tb_usb3_port_is_enabled(struct tb_port *port)
1231 if (tb_port_read(port, &data, TB_CFG_PORT,
1232 port->cap_adap + ADP_USB3_CS_0, 1))
1235 return !!(data & ADP_USB3_CS_0_PE);
1239 * tb_usb3_port_enable() - Enable USB3 adapter port
1240 * @port: USB3 adapter port to enable
1241 * @enable: Enable/disable the USB3 adapter
1243 int tb_usb3_port_enable(struct tb_port *port, bool enable)
1245 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1248 if (!port->cap_adap)
1250 return tb_port_write(port, &word, TB_CFG_PORT,
1251 port->cap_adap + ADP_USB3_CS_0, 1);
1255 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1256 * @port: PCIe port to check
1258 bool tb_pci_port_is_enabled(struct tb_port *port)
1262 if (tb_port_read(port, &data, TB_CFG_PORT,
1263 port->cap_adap + ADP_PCIE_CS_0, 1))
1266 return !!(data & ADP_PCIE_CS_0_PE);
1270 * tb_pci_port_enable() - Enable PCIe adapter port
1271 * @port: PCIe port to enable
1272 * @enable: Enable/disable the PCIe adapter
1274 int tb_pci_port_enable(struct tb_port *port, bool enable)
1276 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1277 if (!port->cap_adap)
1279 return tb_port_write(port, &word, TB_CFG_PORT,
1280 port->cap_adap + ADP_PCIE_CS_0, 1);
1284 * tb_dp_port_hpd_is_active() - Is HPD already active
1285 * @port: DP out port to check
1287 * Checks if the DP OUT adapter port has HDP bit already set.
1289 int tb_dp_port_hpd_is_active(struct tb_port *port)
1294 ret = tb_port_read(port, &data, TB_CFG_PORT,
1295 port->cap_adap + ADP_DP_CS_2, 1);
1299 return !!(data & ADP_DP_CS_2_HDP);
1303 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1304 * @port: Port to clear HPD
1306 * If the DP IN port has HDP set, this function can be used to clear it.
1308 int tb_dp_port_hpd_clear(struct tb_port *port)
1313 ret = tb_port_read(port, &data, TB_CFG_PORT,
1314 port->cap_adap + ADP_DP_CS_3, 1);
1318 data |= ADP_DP_CS_3_HDPC;
1319 return tb_port_write(port, &data, TB_CFG_PORT,
1320 port->cap_adap + ADP_DP_CS_3, 1);
1324 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1325 * @port: DP IN/OUT port to set hops
1326 * @video: Video Hop ID
1327 * @aux_tx: AUX TX Hop ID
1328 * @aux_rx: AUX RX Hop ID
1330 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1331 * router DP adapters too but does not program the values as the fields
1334 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1335 unsigned int aux_tx, unsigned int aux_rx)
1340 if (tb_switch_is_usb4(port->sw))
1343 ret = tb_port_read(port, data, TB_CFG_PORT,
1344 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1348 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1349 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1350 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1352 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1353 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1354 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1355 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1356 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1358 return tb_port_write(port, data, TB_CFG_PORT,
1359 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1363 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1364 * @port: DP adapter port to check
1366 bool tb_dp_port_is_enabled(struct tb_port *port)
1370 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1374 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1378 * tb_dp_port_enable() - Enables/disables DP paths of a port
1379 * @port: DP IN/OUT port
1380 * @enable: Enable/disable DP path
1382 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1383 * calling this function.
1385 int tb_dp_port_enable(struct tb_port *port, bool enable)
1390 ret = tb_port_read(port, data, TB_CFG_PORT,
1391 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1396 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1398 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1400 return tb_port_write(port, data, TB_CFG_PORT,
1401 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1404 /* switch utility functions */
1406 static const char *tb_switch_generation_name(const struct tb_switch *sw)
1408 switch (sw->generation) {
1410 return "Thunderbolt 1";
1412 return "Thunderbolt 2";
1414 return "Thunderbolt 3";
1422 static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1424 const struct tb_regs_switch_header *regs = &sw->config;
1426 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1427 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1428 regs->revision, regs->thunderbolt_version);
1429 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1430 tb_dbg(tb, " Config:\n");
1432 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1433 regs->upstream_port_number, regs->depth,
1434 (((u64) regs->route_hi) << 32) | regs->route_lo,
1435 regs->enabled, regs->plug_events_delay);
1436 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1437 regs->__unknown1, regs->__unknown4);
1441 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1442 * @sw: Switch to reset
1444 * Return: Returns 0 on success or an error code on failure.
1446 int tb_switch_reset(struct tb_switch *sw)
1448 struct tb_cfg_result res;
1450 if (sw->generation > 1)
1453 tb_sw_dbg(sw, "resetting switch\n");
1455 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1456 TB_CFG_SWITCH, 2, 2);
1459 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
1466 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
1467 * @sw: Router to read the offset value from
1468 * @offset: Offset in the router config space to read from
1469 * @bit: Bit mask in the offset to wait for
1470 * @value: Value of the bits to wait for
1471 * @timeout_msec: Timeout in ms how long to wait
1473 * Wait till the specified bits in specified offset reach specified value.
1474 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
1475 * within the given timeout or a negative errno in case of failure.
1477 int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
1478 u32 value, int timeout_msec)
1480 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1486 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
1490 if ((val & bit) == value)
1493 usleep_range(50, 100);
1494 } while (ktime_before(ktime_get(), timeout));
1500 * tb_plug_events_active() - enable/disable plug events on a switch
1502 * Also configures a sane plug_events_delay of 255ms.
1504 * Return: Returns 0 on success or an error code on failure.
1506 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1511 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1514 sw->config.plug_events_delay = 0xff;
1515 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1519 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1524 data = data & 0xFFFFFF83;
1525 switch (sw->config.device_id) {
1526 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1527 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1528 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1532 * Skip Alpine Ridge, it needs to have vendor
1533 * specific USB hotplug event enabled for the
1534 * internal xHCI to work.
1536 if (!tb_switch_is_alpine_ridge(sw))
1537 data |= TB_PLUG_EVENTS_USB_DISABLE;
1542 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1543 sw->cap_plug_events + 1, 1);
1546 static ssize_t authorized_show(struct device *dev,
1547 struct device_attribute *attr,
1550 struct tb_switch *sw = tb_to_switch(dev);
1552 return sprintf(buf, "%u\n", sw->authorized);
1555 static int disapprove_switch(struct device *dev, void *not_used)
1557 char *envp[] = { "AUTHORIZED=0", NULL };
1558 struct tb_switch *sw;
1560 sw = tb_to_switch(dev);
1561 if (sw && sw->authorized) {
1564 /* First children */
1565 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1569 ret = tb_domain_disapprove_switch(sw->tb, sw);
1574 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1580 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1582 char envp_string[13];
1584 char *envp[] = { envp_string, NULL };
1586 if (!mutex_trylock(&sw->tb->lock))
1587 return restart_syscall();
1589 if (!!sw->authorized == !!val)
1593 /* Disapprove switch */
1596 ret = disapprove_switch(&sw->dev, NULL);
1601 /* Approve switch */
1604 ret = tb_domain_approve_switch_key(sw->tb, sw);
1606 ret = tb_domain_approve_switch(sw->tb, sw);
1609 /* Challenge switch */
1612 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1620 sw->authorized = val;
1622 * Notify status change to the userspace, informing the new
1623 * value of /sys/bus/thunderbolt/devices/.../authorized.
1625 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
1626 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1630 mutex_unlock(&sw->tb->lock);
1634 static ssize_t authorized_store(struct device *dev,
1635 struct device_attribute *attr,
1636 const char *buf, size_t count)
1638 struct tb_switch *sw = tb_to_switch(dev);
1642 ret = kstrtouint(buf, 0, &val);
1648 pm_runtime_get_sync(&sw->dev);
1649 ret = tb_switch_set_authorized(sw, val);
1650 pm_runtime_mark_last_busy(&sw->dev);
1651 pm_runtime_put_autosuspend(&sw->dev);
1653 return ret ? ret : count;
1655 static DEVICE_ATTR_RW(authorized);
1657 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1660 struct tb_switch *sw = tb_to_switch(dev);
1662 return sprintf(buf, "%u\n", sw->boot);
1664 static DEVICE_ATTR_RO(boot);
1666 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1669 struct tb_switch *sw = tb_to_switch(dev);
1671 return sprintf(buf, "%#x\n", sw->device);
1673 static DEVICE_ATTR_RO(device);
1676 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1678 struct tb_switch *sw = tb_to_switch(dev);
1680 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1682 static DEVICE_ATTR_RO(device_name);
1685 generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1687 struct tb_switch *sw = tb_to_switch(dev);
1689 return sprintf(buf, "%u\n", sw->generation);
1691 static DEVICE_ATTR_RO(generation);
1693 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1696 struct tb_switch *sw = tb_to_switch(dev);
1699 if (!mutex_trylock(&sw->tb->lock))
1700 return restart_syscall();
1703 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1705 ret = sprintf(buf, "\n");
1707 mutex_unlock(&sw->tb->lock);
1711 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1712 const char *buf, size_t count)
1714 struct tb_switch *sw = tb_to_switch(dev);
1715 u8 key[TB_SWITCH_KEY_SIZE];
1716 ssize_t ret = count;
1719 if (!strcmp(buf, "\n"))
1721 else if (hex2bin(key, buf, sizeof(key)))
1724 if (!mutex_trylock(&sw->tb->lock))
1725 return restart_syscall();
1727 if (sw->authorized) {
1734 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1740 mutex_unlock(&sw->tb->lock);
1743 static DEVICE_ATTR(key, 0600, key_show, key_store);
1745 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1748 struct tb_switch *sw = tb_to_switch(dev);
1750 return sprintf(buf, "%u.0 Gb/s\n", sw->link_speed);
1754 * Currently all lanes must run at the same speed but we expose here
1755 * both directions to allow possible asymmetric links in the future.
1757 static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1758 static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1760 static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1763 struct tb_switch *sw = tb_to_switch(dev);
1765 return sprintf(buf, "%u\n", sw->link_width);
1769 * Currently link has same amount of lanes both directions (1 or 2) but
1770 * expose them separately to allow possible asymmetric links in the future.
1772 static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1773 static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1775 static ssize_t nvm_authenticate_show(struct device *dev,
1776 struct device_attribute *attr, char *buf)
1778 struct tb_switch *sw = tb_to_switch(dev);
1781 nvm_get_auth_status(sw, &status);
1782 return sprintf(buf, "%#x\n", status);
1785 static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1788 struct tb_switch *sw = tb_to_switch(dev);
1791 pm_runtime_get_sync(&sw->dev);
1793 if (!mutex_trylock(&sw->tb->lock)) {
1794 ret = restart_syscall();
1798 /* If NVMem devices are not yet added */
1804 ret = kstrtoint(buf, 10, &val);
1808 /* Always clear the authentication status */
1809 nvm_clear_auth_status(sw);
1812 if (val == AUTHENTICATE_ONLY) {
1816 ret = nvm_authenticate(sw, true);
1818 if (!sw->nvm->flushed) {
1819 if (!sw->nvm->buf) {
1824 ret = nvm_validate_and_write(sw);
1825 if (ret || val == WRITE_ONLY)
1828 if (val == WRITE_AND_AUTHENTICATE) {
1830 ret = tb_lc_force_power(sw);
1832 ret = nvm_authenticate(sw, false);
1838 mutex_unlock(&sw->tb->lock);
1840 pm_runtime_mark_last_busy(&sw->dev);
1841 pm_runtime_put_autosuspend(&sw->dev);
1846 static ssize_t nvm_authenticate_store(struct device *dev,
1847 struct device_attribute *attr, const char *buf, size_t count)
1849 int ret = nvm_authenticate_sysfs(dev, buf, false);
1854 static DEVICE_ATTR_RW(nvm_authenticate);
1856 static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
1857 struct device_attribute *attr, char *buf)
1859 return nvm_authenticate_show(dev, attr, buf);
1862 static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
1863 struct device_attribute *attr, const char *buf, size_t count)
1867 ret = nvm_authenticate_sysfs(dev, buf, true);
1868 return ret ? ret : count;
1870 static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
1872 static ssize_t nvm_version_show(struct device *dev,
1873 struct device_attribute *attr, char *buf)
1875 struct tb_switch *sw = tb_to_switch(dev);
1878 if (!mutex_trylock(&sw->tb->lock))
1879 return restart_syscall();
1886 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1888 mutex_unlock(&sw->tb->lock);
1892 static DEVICE_ATTR_RO(nvm_version);
1894 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1897 struct tb_switch *sw = tb_to_switch(dev);
1899 return sprintf(buf, "%#x\n", sw->vendor);
1901 static DEVICE_ATTR_RO(vendor);
1904 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1906 struct tb_switch *sw = tb_to_switch(dev);
1908 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1910 static DEVICE_ATTR_RO(vendor_name);
1912 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1915 struct tb_switch *sw = tb_to_switch(dev);
1917 return sprintf(buf, "%pUb\n", sw->uuid);
1919 static DEVICE_ATTR_RO(unique_id);
1921 static struct attribute *switch_attrs[] = {
1922 &dev_attr_authorized.attr,
1923 &dev_attr_boot.attr,
1924 &dev_attr_device.attr,
1925 &dev_attr_device_name.attr,
1926 &dev_attr_generation.attr,
1928 &dev_attr_nvm_authenticate.attr,
1929 &dev_attr_nvm_authenticate_on_disconnect.attr,
1930 &dev_attr_nvm_version.attr,
1931 &dev_attr_rx_speed.attr,
1932 &dev_attr_rx_lanes.attr,
1933 &dev_attr_tx_speed.attr,
1934 &dev_attr_tx_lanes.attr,
1935 &dev_attr_vendor.attr,
1936 &dev_attr_vendor_name.attr,
1937 &dev_attr_unique_id.attr,
1941 static umode_t switch_attr_is_visible(struct kobject *kobj,
1942 struct attribute *attr, int n)
1944 struct device *dev = kobj_to_dev(kobj);
1945 struct tb_switch *sw = tb_to_switch(dev);
1947 if (attr == &dev_attr_authorized.attr) {
1948 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
1949 sw->tb->security_level == TB_SECURITY_DPONLY)
1951 } else if (attr == &dev_attr_device.attr) {
1954 } else if (attr == &dev_attr_device_name.attr) {
1955 if (!sw->device_name)
1957 } else if (attr == &dev_attr_vendor.attr) {
1960 } else if (attr == &dev_attr_vendor_name.attr) {
1961 if (!sw->vendor_name)
1963 } else if (attr == &dev_attr_key.attr) {
1965 sw->tb->security_level == TB_SECURITY_SECURE &&
1966 sw->security_level == TB_SECURITY_SECURE)
1969 } else if (attr == &dev_attr_rx_speed.attr ||
1970 attr == &dev_attr_rx_lanes.attr ||
1971 attr == &dev_attr_tx_speed.attr ||
1972 attr == &dev_attr_tx_lanes.attr) {
1976 } else if (attr == &dev_attr_nvm_authenticate.attr) {
1977 if (nvm_upgradeable(sw))
1980 } else if (attr == &dev_attr_nvm_version.attr) {
1981 if (nvm_readable(sw))
1984 } else if (attr == &dev_attr_boot.attr) {
1988 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
1989 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
1994 return sw->safe_mode ? 0 : attr->mode;
1997 static const struct attribute_group switch_group = {
1998 .is_visible = switch_attr_is_visible,
1999 .attrs = switch_attrs,
2002 static const struct attribute_group *switch_groups[] = {
2007 static void tb_switch_release(struct device *dev)
2009 struct tb_switch *sw = tb_to_switch(dev);
2010 struct tb_port *port;
2012 dma_port_free(sw->dma_port);
2014 tb_switch_for_each_port(sw, port) {
2015 ida_destroy(&port->in_hopids);
2016 ida_destroy(&port->out_hopids);
2020 kfree(sw->device_name);
2021 kfree(sw->vendor_name);
2028 static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
2030 struct tb_switch *sw = tb_to_switch(dev);
2033 if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
2034 if (add_uevent_var(env, "USB4_VERSION=1.0"))
2038 if (!tb_route(sw)) {
2041 const struct tb_port *port;
2044 /* Device is hub if it has any downstream ports */
2045 tb_switch_for_each_port(sw, port) {
2046 if (!port->disabled && !tb_is_upstream_port(port) &&
2047 tb_port_is_null(port)) {
2053 type = hub ? "hub" : "device";
2056 if (add_uevent_var(env, "USB4_TYPE=%s", type))
2062 * Currently only need to provide the callbacks. Everything else is handled
2063 * in the connection manager.
2065 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
2067 struct tb_switch *sw = tb_to_switch(dev);
2068 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2070 if (cm_ops->runtime_suspend_switch)
2071 return cm_ops->runtime_suspend_switch(sw);
2076 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
2078 struct tb_switch *sw = tb_to_switch(dev);
2079 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2081 if (cm_ops->runtime_resume_switch)
2082 return cm_ops->runtime_resume_switch(sw);
2086 static const struct dev_pm_ops tb_switch_pm_ops = {
2087 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
2091 struct device_type tb_switch_type = {
2092 .name = "thunderbolt_device",
2093 .release = tb_switch_release,
2094 .uevent = tb_switch_uevent,
2095 .pm = &tb_switch_pm_ops,
2098 static int tb_switch_get_generation(struct tb_switch *sw)
2100 switch (sw->config.device_id) {
2101 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
2102 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
2103 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
2104 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
2105 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
2106 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
2107 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
2108 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
2111 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
2112 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
2113 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
2116 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
2117 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
2118 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
2119 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
2120 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
2121 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
2122 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
2123 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
2124 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
2125 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
2129 if (tb_switch_is_usb4(sw))
2133 * For unknown switches assume generation to be 1 to be
2136 tb_sw_warn(sw, "unsupported switch device id %#x\n",
2137 sw->config.device_id);
2142 static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
2146 if (tb_switch_is_usb4(sw) ||
2147 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
2148 max_depth = USB4_SWITCH_MAX_DEPTH;
2150 max_depth = TB_SWITCH_MAX_DEPTH;
2152 return depth > max_depth;
2156 * tb_switch_alloc() - allocate a switch
2157 * @tb: Pointer to the owning domain
2158 * @parent: Parent device for this switch
2159 * @route: Route string for this switch
2161 * Allocates and initializes a switch. Will not upload configuration to
2162 * the switch. For that you need to call tb_switch_configure()
2163 * separately. The returned switch should be released by calling
2166 * Return: Pointer to the allocated switch or ERR_PTR() in case of
2169 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
2172 struct tb_switch *sw;
2176 /* Unlock the downstream port so we can access the switch below */
2178 struct tb_switch *parent_sw = tb_to_switch(parent);
2179 struct tb_port *down;
2181 down = tb_port_at(route, parent_sw);
2182 tb_port_unlock(down);
2185 depth = tb_route_length(route);
2187 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
2188 if (upstream_port < 0)
2189 return ERR_PTR(upstream_port);
2191 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2193 return ERR_PTR(-ENOMEM);
2196 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
2198 goto err_free_sw_ports;
2200 sw->generation = tb_switch_get_generation(sw);
2202 tb_dbg(tb, "current switch config:\n");
2203 tb_dump_switch(tb, sw);
2205 /* configure switch */
2206 sw->config.upstream_port_number = upstream_port;
2207 sw->config.depth = depth;
2208 sw->config.route_hi = upper_32_bits(route);
2209 sw->config.route_lo = lower_32_bits(route);
2210 sw->config.enabled = 0;
2212 /* Make sure we do not exceed maximum topology limit */
2213 if (tb_switch_exceeds_max_depth(sw, depth)) {
2214 ret = -EADDRNOTAVAIL;
2215 goto err_free_sw_ports;
2218 /* initialize ports */
2219 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
2223 goto err_free_sw_ports;
2226 for (i = 0; i <= sw->config.max_port_number; i++) {
2227 /* minimum setup for tb_find_cap and tb_drom_read to work */
2228 sw->ports[i].sw = sw;
2229 sw->ports[i].port = i;
2231 /* Control port does not need HopID allocation */
2233 ida_init(&sw->ports[i].in_hopids);
2234 ida_init(&sw->ports[i].out_hopids);
2238 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2240 sw->cap_plug_events = ret;
2242 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
2244 sw->cap_vsec_tmu = ret;
2246 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2250 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
2254 /* Root switch is always authorized */
2256 sw->authorized = true;
2258 device_initialize(&sw->dev);
2259 sw->dev.parent = parent;
2260 sw->dev.bus = &tb_bus_type;
2261 sw->dev.type = &tb_switch_type;
2262 sw->dev.groups = switch_groups;
2263 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2271 return ERR_PTR(ret);
2275 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2276 * @tb: Pointer to the owning domain
2277 * @parent: Parent device for this switch
2278 * @route: Route string for this switch
2280 * This creates a switch in safe mode. This means the switch pretty much
2281 * lacks all capabilities except DMA configuration port before it is
2282 * flashed with a valid NVM firmware.
2284 * The returned switch must be released by calling tb_switch_put().
2286 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2289 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2291 struct tb_switch *sw;
2293 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2295 return ERR_PTR(-ENOMEM);
2298 sw->config.depth = tb_route_length(route);
2299 sw->config.route_hi = upper_32_bits(route);
2300 sw->config.route_lo = lower_32_bits(route);
2301 sw->safe_mode = true;
2303 device_initialize(&sw->dev);
2304 sw->dev.parent = parent;
2305 sw->dev.bus = &tb_bus_type;
2306 sw->dev.type = &tb_switch_type;
2307 sw->dev.groups = switch_groups;
2308 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2314 * tb_switch_configure() - Uploads configuration to the switch
2315 * @sw: Switch to configure
2317 * Call this function before the switch is added to the system. It will
2318 * upload configuration to the switch and makes it available for the
2319 * connection manager to use. Can be called to the switch again after
2320 * resume from low power states to re-initialize it.
2322 * Return: %0 in case of success and negative errno in case of failure
2324 int tb_switch_configure(struct tb_switch *sw)
2326 struct tb *tb = sw->tb;
2330 route = tb_route(sw);
2332 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2333 sw->config.enabled ? "restoring" : "initializing", route,
2334 tb_route_length(route), sw->config.upstream_port_number);
2336 sw->config.enabled = 1;
2338 if (tb_switch_is_usb4(sw)) {
2340 * For USB4 devices, we need to program the CM version
2341 * accordingly so that it knows to expose all the
2342 * additional capabilities.
2344 sw->config.cmuv = USB4_VERSION_1_0;
2346 /* Enumerate the switch */
2347 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2352 ret = usb4_switch_setup(sw);
2354 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2355 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2356 sw->config.vendor_id);
2358 if (!sw->cap_plug_events) {
2359 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2363 /* Enumerate the switch */
2364 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2370 return tb_plug_events_active(sw, true);
2373 static int tb_switch_set_uuid(struct tb_switch *sw)
2382 if (tb_switch_is_usb4(sw)) {
2383 ret = usb4_switch_read_uid(sw, &sw->uid);
2389 * The newer controllers include fused UUID as part of
2390 * link controller specific registers
2392 ret = tb_lc_read_uuid(sw, uuid);
2402 * ICM generates UUID based on UID and fills the upper
2403 * two words with ones. This is not strictly following
2404 * UUID format but we want to be compatible with it so
2405 * we do the same here.
2407 uuid[0] = sw->uid & 0xffffffff;
2408 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2409 uuid[2] = 0xffffffff;
2410 uuid[3] = 0xffffffff;
2413 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2419 static int tb_switch_add_dma_port(struct tb_switch *sw)
2424 switch (sw->generation) {
2426 /* Only root switch can be upgraded */
2433 ret = tb_switch_set_uuid(sw);
2440 * DMA port is the only thing available when the switch
2448 if (sw->no_nvm_upgrade)
2451 if (tb_switch_is_usb4(sw)) {
2452 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2457 tb_sw_info(sw, "switch flash authentication failed\n");
2458 nvm_set_auth_status(sw, status);
2464 /* Root switch DMA port requires running firmware */
2465 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2468 sw->dma_port = dma_port_alloc(sw);
2473 * If there is status already set then authentication failed
2474 * when the dma_port_flash_update_auth() returned. Power cycling
2475 * is not needed (it was done already) so only thing we do here
2476 * is to unblock runtime PM of the root port.
2478 nvm_get_auth_status(sw, &status);
2481 nvm_authenticate_complete_dma_port(sw);
2486 * Check status of the previous flash authentication. If there
2487 * is one we need to power cycle the switch in any case to make
2488 * it functional again.
2490 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2494 /* Now we can allow root port to suspend again */
2496 nvm_authenticate_complete_dma_port(sw);
2499 tb_sw_info(sw, "switch flash authentication failed\n");
2500 nvm_set_auth_status(sw, status);
2503 tb_sw_info(sw, "power cycling the switch now\n");
2504 dma_port_power_cycle(sw->dma_port);
2507 * We return error here which causes the switch adding failure.
2508 * It should appear back after power cycle is complete.
2513 static void tb_switch_default_link_ports(struct tb_switch *sw)
2517 for (i = 1; i <= sw->config.max_port_number; i++) {
2518 struct tb_port *port = &sw->ports[i];
2519 struct tb_port *subordinate;
2521 if (!tb_port_is_null(port))
2524 /* Check for the subordinate port */
2525 if (i == sw->config.max_port_number ||
2526 !tb_port_is_null(&sw->ports[i + 1]))
2529 /* Link them if not already done so (by DROM) */
2530 subordinate = &sw->ports[i + 1];
2531 if (!port->dual_link_port && !subordinate->dual_link_port) {
2533 port->dual_link_port = subordinate;
2534 subordinate->link_nr = 1;
2535 subordinate->dual_link_port = port;
2537 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2538 port->port, subordinate->port);
2543 static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2545 const struct tb_port *up = tb_upstream_port(sw);
2547 if (!up->dual_link_port || !up->dual_link_port->remote)
2550 if (tb_switch_is_usb4(sw))
2551 return usb4_switch_lane_bonding_possible(sw);
2552 return tb_lc_lane_bonding_possible(sw);
2555 static int tb_switch_update_link_attributes(struct tb_switch *sw)
2558 bool change = false;
2561 if (!tb_route(sw) || tb_switch_is_icm(sw))
2564 up = tb_upstream_port(sw);
2566 ret = tb_port_get_link_speed(up);
2569 if (sw->link_speed != ret)
2571 sw->link_speed = ret;
2573 ret = tb_port_get_link_width(up);
2576 if (sw->link_width != ret)
2578 sw->link_width = ret;
2580 /* Notify userspace that there is possible link attribute change */
2581 if (device_is_registered(&sw->dev) && change)
2582 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2588 * tb_switch_lane_bonding_enable() - Enable lane bonding
2589 * @sw: Switch to enable lane bonding
2591 * Connection manager can call this function to enable lane bonding of a
2592 * switch. If conditions are correct and both switches support the feature,
2593 * lanes are bonded. It is safe to call this to any switch.
2595 int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2597 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2598 struct tb_port *up, *down;
2599 u64 route = tb_route(sw);
2605 if (!tb_switch_lane_bonding_possible(sw))
2608 up = tb_upstream_port(sw);
2609 down = tb_port_at(route, parent);
2611 if (!tb_port_is_width_supported(up, 2) ||
2612 !tb_port_is_width_supported(down, 2))
2615 ret = tb_port_lane_bonding_enable(up);
2617 tb_port_warn(up, "failed to enable lane bonding\n");
2621 ret = tb_port_lane_bonding_enable(down);
2623 tb_port_warn(down, "failed to enable lane bonding\n");
2624 tb_port_lane_bonding_disable(up);
2628 ret = tb_port_wait_for_link_width(down, 2, 100);
2630 tb_port_warn(down, "timeout enabling lane bonding\n");
2634 tb_port_update_credits(down);
2635 tb_port_update_credits(up);
2636 tb_switch_update_link_attributes(sw);
2638 tb_sw_dbg(sw, "lane bonding enabled\n");
2643 * tb_switch_lane_bonding_disable() - Disable lane bonding
2644 * @sw: Switch whose lane bonding to disable
2646 * Disables lane bonding between @sw and parent. This can be called even
2647 * if lanes were not bonded originally.
2649 void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2651 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2652 struct tb_port *up, *down;
2657 up = tb_upstream_port(sw);
2661 down = tb_port_at(tb_route(sw), parent);
2663 tb_port_lane_bonding_disable(up);
2664 tb_port_lane_bonding_disable(down);
2667 * It is fine if we get other errors as the router might have
2670 if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT)
2671 tb_sw_warn(sw, "timeout disabling lane bonding\n");
2673 tb_port_update_credits(down);
2674 tb_port_update_credits(up);
2675 tb_switch_update_link_attributes(sw);
2677 tb_sw_dbg(sw, "lane bonding disabled\n");
2681 * tb_switch_configure_link() - Set link configured
2682 * @sw: Switch whose link is configured
2684 * Sets the link upstream from @sw configured (from both ends) so that
2685 * it will not be disconnected when the domain exits sleep. Can be
2686 * called for any switch.
2688 * It is recommended that this is called after lane bonding is enabled.
2690 * Returns %0 on success and negative errno in case of error.
2692 int tb_switch_configure_link(struct tb_switch *sw)
2694 struct tb_port *up, *down;
2697 if (!tb_route(sw) || tb_switch_is_icm(sw))
2700 up = tb_upstream_port(sw);
2701 if (tb_switch_is_usb4(up->sw))
2702 ret = usb4_port_configure(up);
2704 ret = tb_lc_configure_port(up);
2709 if (tb_switch_is_usb4(down->sw))
2710 return usb4_port_configure(down);
2711 return tb_lc_configure_port(down);
2715 * tb_switch_unconfigure_link() - Unconfigure link
2716 * @sw: Switch whose link is unconfigured
2718 * Sets the link unconfigured so the @sw will be disconnected if the
2719 * domain exists sleep.
2721 void tb_switch_unconfigure_link(struct tb_switch *sw)
2723 struct tb_port *up, *down;
2725 if (sw->is_unplugged)
2727 if (!tb_route(sw) || tb_switch_is_icm(sw))
2730 up = tb_upstream_port(sw);
2731 if (tb_switch_is_usb4(up->sw))
2732 usb4_port_unconfigure(up);
2734 tb_lc_unconfigure_port(up);
2737 if (tb_switch_is_usb4(down->sw))
2738 usb4_port_unconfigure(down);
2740 tb_lc_unconfigure_port(down);
2743 static void tb_switch_credits_init(struct tb_switch *sw)
2745 if (tb_switch_is_icm(sw))
2747 if (!tb_switch_is_usb4(sw))
2749 if (usb4_switch_credits_init(sw))
2750 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
2754 * tb_switch_add() - Add a switch to the domain
2755 * @sw: Switch to add
2757 * This is the last step in adding switch to the domain. It will read
2758 * identification information from DROM and initializes ports so that
2759 * they can be used to connect other switches. The switch will be
2760 * exposed to the userspace when this function successfully returns. To
2761 * remove and release the switch, call tb_switch_remove().
2763 * Return: %0 in case of success and negative errno in case of failure
2765 int tb_switch_add(struct tb_switch *sw)
2770 * Initialize DMA control port now before we read DROM. Recent
2771 * host controllers have more complete DROM on NVM that includes
2772 * vendor and model identification strings which we then expose
2773 * to the userspace. NVM can be accessed through DMA
2774 * configuration based mailbox.
2776 ret = tb_switch_add_dma_port(sw);
2778 dev_err(&sw->dev, "failed to add DMA port\n");
2782 if (!sw->safe_mode) {
2783 tb_switch_credits_init(sw);
2786 ret = tb_drom_read(sw);
2788 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
2789 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2791 tb_check_quirks(sw);
2793 ret = tb_switch_set_uuid(sw);
2795 dev_err(&sw->dev, "failed to set UUID\n");
2799 for (i = 0; i <= sw->config.max_port_number; i++) {
2800 if (sw->ports[i].disabled) {
2801 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2804 ret = tb_init_port(&sw->ports[i]);
2806 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2811 tb_switch_default_link_ports(sw);
2813 ret = tb_switch_update_link_attributes(sw);
2817 ret = tb_switch_tmu_init(sw);
2822 ret = device_add(&sw->dev);
2824 dev_err(&sw->dev, "failed to add device: %d\n", ret);
2829 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
2830 sw->vendor, sw->device);
2831 if (sw->vendor_name && sw->device_name)
2832 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
2836 ret = usb4_switch_add_ports(sw);
2838 dev_err(&sw->dev, "failed to add USB4 ports\n");
2842 ret = tb_switch_nvm_add(sw);
2844 dev_err(&sw->dev, "failed to add NVM devices\n");
2849 * Thunderbolt routers do not generate wakeups themselves but
2850 * they forward wakeups from tunneled protocols, so enable it
2853 device_init_wakeup(&sw->dev, true);
2855 pm_runtime_set_active(&sw->dev);
2857 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
2858 pm_runtime_use_autosuspend(&sw->dev);
2859 pm_runtime_mark_last_busy(&sw->dev);
2860 pm_runtime_enable(&sw->dev);
2861 pm_request_autosuspend(&sw->dev);
2864 tb_switch_debugfs_init(sw);
2868 usb4_switch_remove_ports(sw);
2870 device_del(&sw->dev);
2876 * tb_switch_remove() - Remove and release a switch
2877 * @sw: Switch to remove
2879 * This will remove the switch from the domain and release it after last
2880 * reference count drops to zero. If there are switches connected below
2881 * this switch, they will be removed as well.
2883 void tb_switch_remove(struct tb_switch *sw)
2885 struct tb_port *port;
2887 tb_switch_debugfs_remove(sw);
2890 pm_runtime_get_sync(&sw->dev);
2891 pm_runtime_disable(&sw->dev);
2894 /* port 0 is the switch itself and never has a remote */
2895 tb_switch_for_each_port(sw, port) {
2896 if (tb_port_has_remote(port)) {
2897 tb_switch_remove(port->remote->sw);
2898 port->remote = NULL;
2899 } else if (port->xdomain) {
2900 tb_xdomain_remove(port->xdomain);
2901 port->xdomain = NULL;
2904 /* Remove any downstream retimers */
2905 tb_retimer_remove_all(port);
2908 if (!sw->is_unplugged)
2909 tb_plug_events_active(sw, false);
2911 tb_switch_nvm_remove(sw);
2912 usb4_switch_remove_ports(sw);
2915 dev_info(&sw->dev, "device disconnected\n");
2916 device_unregister(&sw->dev);
2920 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
2921 * @sw: Router to mark unplugged
2923 void tb_sw_set_unplugged(struct tb_switch *sw)
2925 struct tb_port *port;
2927 if (sw == sw->tb->root_switch) {
2928 tb_sw_WARN(sw, "cannot unplug root switch\n");
2931 if (sw->is_unplugged) {
2932 tb_sw_WARN(sw, "is_unplugged already set\n");
2935 sw->is_unplugged = true;
2936 tb_switch_for_each_port(sw, port) {
2937 if (tb_port_has_remote(port))
2938 tb_sw_set_unplugged(port->remote->sw);
2939 else if (port->xdomain)
2940 port->xdomain->is_unplugged = true;
2944 static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
2947 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
2949 tb_sw_dbg(sw, "disabling wakeup\n");
2951 if (tb_switch_is_usb4(sw))
2952 return usb4_switch_set_wake(sw, flags);
2953 return tb_lc_set_wake(sw, flags);
2956 int tb_switch_resume(struct tb_switch *sw)
2958 struct tb_port *port;
2961 tb_sw_dbg(sw, "resuming switch\n");
2964 * Check for UID of the connected switches except for root
2965 * switch which we assume cannot be removed.
2971 * Check first that we can still read the switch config
2972 * space. It may be that there is now another domain
2975 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
2977 tb_sw_info(sw, "switch not present anymore\n");
2981 /* We don't have any way to confirm this was the same device */
2985 if (tb_switch_is_usb4(sw))
2986 err = usb4_switch_read_uid(sw, &uid);
2988 err = tb_drom_read_uid_only(sw, &uid);
2990 tb_sw_warn(sw, "uid read failed\n");
2993 if (sw->uid != uid) {
2995 "changed while suspended (uid %#llx -> %#llx)\n",
3001 err = tb_switch_configure(sw);
3006 tb_switch_set_wake(sw, 0);
3008 err = tb_switch_tmu_init(sw);
3012 /* check for surviving downstream switches */
3013 tb_switch_for_each_port(sw, port) {
3014 if (!tb_port_is_null(port))
3017 if (!tb_port_resume(port))
3020 if (tb_wait_for_port(port, true) <= 0) {
3022 "lost during suspend, disconnecting\n");
3023 if (tb_port_has_remote(port))
3024 tb_sw_set_unplugged(port->remote->sw);
3025 else if (port->xdomain)
3026 port->xdomain->is_unplugged = true;
3029 * Always unlock the port so the downstream
3030 * switch/domain is accessible.
3032 if (tb_port_unlock(port))
3033 tb_port_warn(port, "failed to unlock port\n");
3034 if (port->remote && tb_switch_resume(port->remote->sw)) {
3036 "lost during suspend, disconnecting\n");
3037 tb_sw_set_unplugged(port->remote->sw);
3045 * tb_switch_suspend() - Put a switch to sleep
3046 * @sw: Switch to suspend
3047 * @runtime: Is this runtime suspend or system sleep
3049 * Suspends router and all its children. Enables wakes according to
3050 * value of @runtime and then sets sleep bit for the router. If @sw is
3051 * host router the domain is ready to go to sleep once this function
3054 void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3056 unsigned int flags = 0;
3057 struct tb_port *port;
3060 tb_sw_dbg(sw, "suspending switch\n");
3063 * Actually only needed for Titan Ridge but for simplicity can be
3064 * done for USB4 device too as CLx is re-enabled at resume.
3066 if (tb_switch_disable_clx(sw, TB_CL0S))
3067 tb_sw_warn(sw, "failed to disable CLx on upstream port\n");
3069 err = tb_plug_events_active(sw, false);
3073 tb_switch_for_each_port(sw, port) {
3074 if (tb_port_has_remote(port))
3075 tb_switch_suspend(port->remote->sw, runtime);
3079 /* Trigger wake when something is plugged in/out */
3080 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3081 flags |= TB_WAKE_ON_USB4;
3082 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3083 } else if (device_may_wakeup(&sw->dev)) {
3084 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3087 tb_switch_set_wake(sw, flags);
3089 if (tb_switch_is_usb4(sw))
3090 usb4_switch_set_sleep(sw);
3092 tb_lc_set_sleep(sw);
3096 * tb_switch_query_dp_resource() - Query availability of DP resource
3097 * @sw: Switch whose DP resource is queried
3100 * Queries availability of DP resource for DP tunneling using switch
3101 * specific means. Returns %true if resource is available.
3103 bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3105 if (tb_switch_is_usb4(sw))
3106 return usb4_switch_query_dp_resource(sw, in);
3107 return tb_lc_dp_sink_query(sw, in);
3111 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3112 * @sw: Switch whose DP resource is allocated
3115 * Allocates DP resource for DP tunneling. The resource must be
3116 * available for this to succeed (see tb_switch_query_dp_resource()).
3117 * Returns %0 in success and negative errno otherwise.
3119 int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3123 if (tb_switch_is_usb4(sw))
3124 ret = usb4_switch_alloc_dp_resource(sw, in);
3126 ret = tb_lc_dp_sink_alloc(sw, in);
3129 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3132 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3138 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3139 * @sw: Switch whose DP resource is de-allocated
3142 * De-allocates DP resource that was previously allocated for DP
3145 void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3149 if (tb_switch_is_usb4(sw))
3150 ret = usb4_switch_dealloc_dp_resource(sw, in);
3152 ret = tb_lc_dp_sink_dealloc(sw, in);
3155 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3158 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3161 struct tb_sw_lookup {
3169 static int tb_switch_match(struct device *dev, const void *data)
3171 struct tb_switch *sw = tb_to_switch(dev);
3172 const struct tb_sw_lookup *lookup = data;
3176 if (sw->tb != lookup->tb)
3180 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3182 if (lookup->route) {
3183 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3184 sw->config.route_hi == upper_32_bits(lookup->route);
3187 /* Root switch is matched only by depth */
3191 return sw->link == lookup->link && sw->depth == lookup->depth;
3195 * tb_switch_find_by_link_depth() - Find switch by link and depth
3196 * @tb: Domain the switch belongs
3197 * @link: Link number the switch is connected
3198 * @depth: Depth of the switch in link
3200 * Returned switch has reference count increased so the caller needs to
3201 * call tb_switch_put() when done with the switch.
3203 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3205 struct tb_sw_lookup lookup;
3208 memset(&lookup, 0, sizeof(lookup));
3211 lookup.depth = depth;
3213 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3215 return tb_to_switch(dev);
3221 * tb_switch_find_by_uuid() - Find switch by UUID
3222 * @tb: Domain the switch belongs
3223 * @uuid: UUID to look for
3225 * Returned switch has reference count increased so the caller needs to
3226 * call tb_switch_put() when done with the switch.
3228 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3230 struct tb_sw_lookup lookup;
3233 memset(&lookup, 0, sizeof(lookup));
3237 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3239 return tb_to_switch(dev);
3245 * tb_switch_find_by_route() - Find switch by route string
3246 * @tb: Domain the switch belongs
3247 * @route: Route string to look for
3249 * Returned switch has reference count increased so the caller needs to
3250 * call tb_switch_put() when done with the switch.
3252 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3254 struct tb_sw_lookup lookup;
3258 return tb_switch_get(tb->root_switch);
3260 memset(&lookup, 0, sizeof(lookup));
3262 lookup.route = route;
3264 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3266 return tb_to_switch(dev);
3272 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3273 * @sw: Switch to find the port from
3274 * @type: Port type to look for
3276 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3277 enum tb_port_type type)
3279 struct tb_port *port;
3281 tb_switch_for_each_port(sw, port) {
3282 if (port->config.type == type)
3289 static int __tb_port_pm_secondary_set(struct tb_port *port, bool secondary)
3294 ret = tb_port_read(port, &phy, TB_CFG_PORT,
3295 port->cap_phy + LANE_ADP_CS_1, 1);
3300 phy |= LANE_ADP_CS_1_PMS;
3302 phy &= ~LANE_ADP_CS_1_PMS;
3304 return tb_port_write(port, &phy, TB_CFG_PORT,
3305 port->cap_phy + LANE_ADP_CS_1, 1);
3308 static int tb_port_pm_secondary_enable(struct tb_port *port)
3310 return __tb_port_pm_secondary_set(port, true);
3313 static int tb_port_pm_secondary_disable(struct tb_port *port)
3315 return __tb_port_pm_secondary_set(port, false);
3318 static int tb_switch_pm_secondary_resolve(struct tb_switch *sw)
3320 struct tb_switch *parent = tb_switch_parent(sw);
3321 struct tb_port *up, *down;
3327 up = tb_upstream_port(sw);
3328 down = tb_port_at(tb_route(sw), parent);
3329 ret = tb_port_pm_secondary_enable(up);
3333 return tb_port_pm_secondary_disable(down);
3336 /* Called for USB4 or Titan Ridge routers only */
3337 static bool tb_port_clx_supported(struct tb_port *port, enum tb_clx clx)
3342 /* Don't enable CLx in case of two single-lane links */
3343 if (!port->bonded && port->dual_link_port)
3346 /* Don't enable CLx in case of inter-domain link */
3350 if (tb_switch_is_usb4(port->sw)) {
3351 if (!usb4_port_clx_supported(port))
3353 } else if (!tb_lc_is_clx_supported(port)) {
3359 /* CL0s support requires also CL1 support */
3360 mask = LANE_ADP_CS_0_CL0S_SUPPORT | LANE_ADP_CS_0_CL1_SUPPORT;
3363 /* For now we support only CL0s. Not CL1, CL2 */
3370 ret = tb_port_read(port, &val, TB_CFG_PORT,
3371 port->cap_phy + LANE_ADP_CS_0, 1);
3375 return !!(val & mask);
3378 static inline bool tb_port_cl0s_supported(struct tb_port *port)
3380 return tb_port_clx_supported(port, TB_CL0S);
3383 static int __tb_port_cl0s_set(struct tb_port *port, bool enable)
3388 /* To enable CL0s also required to enable CL1 */
3389 mask = LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
3390 ret = tb_port_read(port, &phy, TB_CFG_PORT,
3391 port->cap_phy + LANE_ADP_CS_1, 1);
3400 return tb_port_write(port, &phy, TB_CFG_PORT,
3401 port->cap_phy + LANE_ADP_CS_1, 1);
3404 static int tb_port_cl0s_disable(struct tb_port *port)
3406 return __tb_port_cl0s_set(port, false);
3409 static int tb_port_cl0s_enable(struct tb_port *port)
3411 return __tb_port_cl0s_set(port, true);
3414 static int tb_switch_enable_cl0s(struct tb_switch *sw)
3416 struct tb_switch *parent = tb_switch_parent(sw);
3417 bool up_cl0s_support, down_cl0s_support;
3418 struct tb_port *up, *down;
3421 if (!tb_switch_is_clx_supported(sw))
3425 * Enable CLx for host router's downstream port as part of the
3426 * downstream router enabling procedure.
3431 /* Enable CLx only for first hop router (depth = 1) */
3432 if (tb_route(parent))
3435 ret = tb_switch_pm_secondary_resolve(sw);
3439 up = tb_upstream_port(sw);
3440 down = tb_port_at(tb_route(sw), parent);
3442 up_cl0s_support = tb_port_cl0s_supported(up);
3443 down_cl0s_support = tb_port_cl0s_supported(down);
3445 tb_port_dbg(up, "CL0s %ssupported\n",
3446 up_cl0s_support ? "" : "not ");
3447 tb_port_dbg(down, "CL0s %ssupported\n",
3448 down_cl0s_support ? "" : "not ");
3450 if (!up_cl0s_support || !down_cl0s_support)
3453 ret = tb_port_cl0s_enable(up);
3457 ret = tb_port_cl0s_enable(down);
3459 tb_port_cl0s_disable(up);
3463 ret = tb_switch_mask_clx_objections(sw);
3465 tb_port_cl0s_disable(up);
3466 tb_port_cl0s_disable(down);
3472 tb_port_dbg(up, "CL0s enabled\n");
3477 * tb_switch_enable_clx() - Enable CLx on upstream port of specified router
3478 * @sw: Router to enable CLx for
3479 * @clx: The CLx state to enable
3481 * Enable CLx state only for first hop router. That is the most common
3482 * use-case, that is intended for better thermal management, and so helps
3483 * to improve performance. CLx is enabled only if both sides of the link
3484 * support CLx, and if both sides of the link are not configured as two
3485 * single lane links and only if the link is not inter-domain link. The
3486 * complete set of conditions is descibed in CM Guide 1.0 section 8.1.
3488 * Return: Returns 0 on success or an error code on failure.
3490 int tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3492 struct tb_switch *root_sw = sw->tb->root_switch;
3498 * CLx is not enabled and validated on Intel USB4 platforms before
3501 if (root_sw->generation < 4 || tb_switch_is_tiger_lake(root_sw))
3506 return tb_switch_enable_cl0s(sw);
3513 static int tb_switch_disable_cl0s(struct tb_switch *sw)
3515 struct tb_switch *parent = tb_switch_parent(sw);
3516 struct tb_port *up, *down;
3519 if (!tb_switch_is_clx_supported(sw))
3523 * Disable CLx for host router's downstream port as part of the
3524 * downstream router enabling procedure.
3529 /* Disable CLx only for first hop router (depth = 1) */
3530 if (tb_route(parent))
3533 up = tb_upstream_port(sw);
3534 down = tb_port_at(tb_route(sw), parent);
3535 ret = tb_port_cl0s_disable(up);
3539 ret = tb_port_cl0s_disable(down);
3543 sw->clx = TB_CLX_DISABLE;
3545 tb_port_dbg(up, "CL0s disabled\n");
3550 * tb_switch_disable_clx() - Disable CLx on upstream port of specified router
3551 * @sw: Router to disable CLx for
3552 * @clx: The CLx state to disable
3554 * Return: Returns 0 on success or an error code on failure.
3556 int tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3563 return tb_switch_disable_cl0s(sw);
3571 * tb_switch_mask_clx_objections() - Mask CLx objections for a router
3572 * @sw: Router to mask objections for
3574 * Mask the objections coming from the second depth routers in order to
3575 * stop these objections from interfering with the CLx states of the first
3578 int tb_switch_mask_clx_objections(struct tb_switch *sw)
3580 int up_port = sw->config.upstream_port_number;
3581 u32 offset, val[2], mask_obj, unmask_obj;
3584 /* Only Titan Ridge of pre-USB4 devices support CLx states */
3585 if (!tb_switch_is_titan_ridge(sw))
3592 * In Titan Ridge there are only 2 dual-lane Thunderbolt ports:
3593 * Port A consists of lane adapters 1,2 and
3594 * Port B consists of lane adapters 3,4
3595 * If upstream port is A, (lanes are 1,2), we mask objections from
3596 * port B (lanes 3,4) and unmask objections from Port A and vice-versa.
3599 mask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3600 unmask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3601 offset = TB_LOW_PWR_C1_CL1;
3603 mask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3604 unmask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3605 offset = TB_LOW_PWR_C3_CL1;
3608 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
3609 sw->cap_lp + offset, ARRAY_SIZE(val));
3613 for (i = 0; i < ARRAY_SIZE(val); i++) {
3615 val[i] &= ~unmask_obj;
3618 return tb_sw_write(sw, &val, TB_CFG_SWITCH,
3619 sw->cap_lp + offset, ARRAY_SIZE(val));
3623 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3624 * device. For now used only for Titan Ridge.
3626 static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3627 unsigned int pcie_offset, u32 value)
3629 u32 offset, command, val;
3632 if (sw->generation != 3)
3635 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3636 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3640 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3641 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3642 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3643 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3644 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3645 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3647 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3649 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3653 ret = tb_switch_wait_for_bit(sw, offset,
3654 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3658 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3662 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3669 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3670 * @sw: Router to enable PCIe L1
3672 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3673 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3674 * was configured. Due to Intel platforms limitation, shall be called only
3675 * for first hop switch.
3677 int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3679 struct tb_switch *parent = tb_switch_parent(sw);
3685 if (!tb_switch_is_titan_ridge(sw))
3688 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3689 if (tb_route(parent))
3692 /* Write to downstream PCIe bridge #5 aka Dn4 */
3693 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3697 /* Write to Upstream PCIe bridge #0 aka Up0 */
3698 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3702 * tb_switch_xhci_connect() - Connect internal xHCI
3703 * @sw: Router whose xHCI to connect
3705 * Can be called to any router. For Alpine Ridge and Titan Ridge
3706 * performs special flows that bring the xHCI functional for any device
3707 * connected to the type-C port. Call only after PCIe tunnel has been
3708 * established. The function only does the connect if not done already
3709 * so can be called several times for the same router.
3711 int tb_switch_xhci_connect(struct tb_switch *sw)
3713 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3714 struct tb_port *port1, *port3;
3717 port1 = &sw->ports[1];
3718 port3 = &sw->ports[3];
3720 if (tb_switch_is_alpine_ridge(sw)) {
3721 usb_port1 = tb_lc_is_usb_plugged(port1);
3722 usb_port3 = tb_lc_is_usb_plugged(port3);
3723 xhci_port1 = tb_lc_is_xhci_connected(port1);
3724 xhci_port3 = tb_lc_is_xhci_connected(port3);
3726 /* Figure out correct USB port to connect */
3727 if (usb_port1 && !xhci_port1) {
3728 ret = tb_lc_xhci_connect(port1);
3732 if (usb_port3 && !xhci_port3)
3733 return tb_lc_xhci_connect(port3);
3734 } else if (tb_switch_is_titan_ridge(sw)) {
3735 ret = tb_lc_xhci_connect(port1);
3738 return tb_lc_xhci_connect(port3);
3745 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
3746 * @sw: Router whose xHCI to disconnect
3748 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
3751 void tb_switch_xhci_disconnect(struct tb_switch *sw)
3753 if (sw->generation == 3) {
3754 struct tb_port *port1 = &sw->ports[1];
3755 struct tb_port *port3 = &sw->ports[3];
3757 tb_lc_xhci_disconnect(port1);
3758 tb_port_dbg(port1, "disconnected xHCI\n");
3759 tb_lc_xhci_disconnect(port3);
3760 tb_port_dbg(port3, "disconnected xHCI\n");