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;
697 ret = tb_port_write(port, &phy, TB_CFG_PORT,
698 port->cap_phy + LANE_ADP_CS_1, 1);
702 tb_port_dbg(port, "lane %sabled\n", enable ? "en" : "dis");
707 * tb_port_enable() - Enable lane adapter
708 * @port: Port to enable (can be %NULL)
710 * This is used for lane 0 and 1 adapters to enable it.
712 int tb_port_enable(struct tb_port *port)
714 return __tb_port_enable(port, true);
718 * tb_port_disable() - Disable lane adapter
719 * @port: Port to disable (can be %NULL)
721 * This is used for lane 0 and 1 adapters to disable it.
723 int tb_port_disable(struct tb_port *port)
725 return __tb_port_enable(port, false);
729 * tb_init_port() - initialize a port
731 * This is a helper method for tb_switch_alloc. Does not check or initialize
732 * any downstream switches.
734 * Return: Returns 0 on success or an error code on failure.
736 static int tb_init_port(struct tb_port *port)
741 INIT_LIST_HEAD(&port->list);
743 /* Control adapter does not have configuration space */
747 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
749 if (res == -ENODEV) {
750 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
752 port->disabled = true;
758 /* Port 0 is the switch itself and has no PHY. */
759 if (port->config.type == TB_TYPE_PORT) {
760 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
765 tb_port_WARN(port, "non switch port without a PHY\n");
767 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
769 port->cap_usb4 = cap;
772 * USB4 ports the buffers allocated for the control path
773 * can be read from the path config space. Legacy
774 * devices we use hard-coded value.
776 if (tb_switch_is_usb4(port->sw)) {
777 struct tb_regs_hop hop;
779 if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
780 port->ctl_credits = hop.initial_credits;
782 if (!port->ctl_credits)
783 port->ctl_credits = 2;
786 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
788 port->cap_adap = cap;
791 port->total_credits =
792 (port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
793 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
795 tb_dump_port(port->sw->tb, port);
799 static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
806 port_max_hopid = port->config.max_in_hop_id;
807 ida = &port->in_hopids;
809 port_max_hopid = port->config.max_out_hop_id;
810 ida = &port->out_hopids;
814 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
817 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
818 min_hopid = TB_PATH_MIN_HOPID;
820 if (max_hopid < 0 || max_hopid > port_max_hopid)
821 max_hopid = port_max_hopid;
823 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
827 * tb_port_alloc_in_hopid() - Allocate input HopID from port
828 * @port: Port to allocate HopID for
829 * @min_hopid: Minimum acceptable input HopID
830 * @max_hopid: Maximum acceptable input HopID
832 * Return: HopID between @min_hopid and @max_hopid or negative errno in
835 int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
837 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
841 * tb_port_alloc_out_hopid() - Allocate output HopID from port
842 * @port: Port to allocate HopID for
843 * @min_hopid: Minimum acceptable output HopID
844 * @max_hopid: Maximum acceptable output HopID
846 * Return: HopID between @min_hopid and @max_hopid or negative errno in
849 int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
851 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
855 * tb_port_release_in_hopid() - Release allocated input HopID from port
856 * @port: Port whose HopID to release
857 * @hopid: HopID to release
859 void tb_port_release_in_hopid(struct tb_port *port, int hopid)
861 ida_simple_remove(&port->in_hopids, hopid);
865 * tb_port_release_out_hopid() - Release allocated output HopID from port
866 * @port: Port whose HopID to release
867 * @hopid: HopID to release
869 void tb_port_release_out_hopid(struct tb_port *port, int hopid)
871 ida_simple_remove(&port->out_hopids, hopid);
874 static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
875 const struct tb_switch *sw)
877 u64 mask = (1ULL << parent->config.depth * 8) - 1;
878 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
882 * tb_next_port_on_path() - Return next port for given port on a path
883 * @start: Start port of the walk
884 * @end: End port of the walk
885 * @prev: Previous port (%NULL if this is the first)
887 * This function can be used to walk from one port to another if they
888 * are connected through zero or more switches. If the @prev is dual
889 * link port, the function follows that link and returns another end on
892 * If the @end port has been reached, return %NULL.
894 * Domain tb->lock must be held when this function is called.
896 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
897 struct tb_port *prev)
899 struct tb_port *next;
904 if (prev->sw == end->sw) {
910 if (tb_switch_is_reachable(prev->sw, end->sw)) {
911 next = tb_port_at(tb_route(end->sw), prev->sw);
912 /* Walk down the topology if next == prev */
914 (next == prev || next->dual_link_port == prev))
917 if (tb_is_upstream_port(prev)) {
920 next = tb_upstream_port(prev->sw);
922 * Keep the same link if prev and next are both
925 if (next->dual_link_port &&
926 next->link_nr != prev->link_nr) {
927 next = next->dual_link_port;
932 return next != prev ? next : NULL;
936 * tb_port_get_link_speed() - Get current link speed
937 * @port: Port to check (USB4 or CIO)
939 * Returns link speed in Gb/s or negative errno in case of failure.
941 int tb_port_get_link_speed(struct tb_port *port)
949 ret = tb_port_read(port, &val, TB_CFG_PORT,
950 port->cap_phy + LANE_ADP_CS_1, 1);
954 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
955 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
956 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
960 * tb_port_get_link_width() - Get current link width
961 * @port: Port to check (USB4 or CIO)
963 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
964 * or negative errno in case of failure.
966 int tb_port_get_link_width(struct tb_port *port)
974 ret = tb_port_read(port, &val, TB_CFG_PORT,
975 port->cap_phy + LANE_ADP_CS_1, 1);
979 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
980 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
983 static bool tb_port_is_width_supported(struct tb_port *port, int width)
991 ret = tb_port_read(port, &phy, TB_CFG_PORT,
992 port->cap_phy + LANE_ADP_CS_0, 1);
996 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
997 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
999 return !!(widths & width);
1003 * tb_port_set_link_width() - Set target link width of the lane adapter
1004 * @port: Lane adapter
1005 * @width: Target link width (%1 or %2)
1007 * Sets the target link width of the lane adapter to @width. Does not
1008 * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
1010 * Return: %0 in case of success and negative errno in case of error
1012 int tb_port_set_link_width(struct tb_port *port, unsigned int width)
1020 ret = tb_port_read(port, &val, TB_CFG_PORT,
1021 port->cap_phy + LANE_ADP_CS_1, 1);
1025 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
1028 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
1029 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1032 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
1033 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1039 return tb_port_write(port, &val, TB_CFG_PORT,
1040 port->cap_phy + LANE_ADP_CS_1, 1);
1044 * tb_port_set_lane_bonding() - Enable/disable lane bonding
1045 * @port: Lane adapter
1046 * @bonding: enable/disable bonding
1048 * Enables or disables lane bonding. This should be called after target
1049 * link width has been set (tb_port_set_link_width()). Note in most
1050 * cases one should use tb_port_lane_bonding_enable() instead to enable
1053 * As a side effect sets @port->bonding accordingly (and does the same
1056 * Return: %0 in case of success and negative errno in case of error
1058 int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
1066 ret = tb_port_read(port, &val, TB_CFG_PORT,
1067 port->cap_phy + LANE_ADP_CS_1, 1);
1072 val |= LANE_ADP_CS_1_LB;
1074 val &= ~LANE_ADP_CS_1_LB;
1076 ret = tb_port_write(port, &val, TB_CFG_PORT,
1077 port->cap_phy + LANE_ADP_CS_1, 1);
1082 * When lane 0 bonding is set it will affect lane 1 too so
1085 port->bonded = bonding;
1086 port->dual_link_port->bonded = bonding;
1092 * tb_port_lane_bonding_enable() - Enable bonding on port
1093 * @port: port to enable
1095 * Enable bonding by setting the link width of the port and the other
1096 * port in case of dual link port. Does not wait for the link to
1097 * actually reach the bonded state so caller needs to call
1098 * tb_port_wait_for_link_width() before enabling any paths through the
1099 * link to make sure the link is in expected state.
1101 * Return: %0 in case of success and negative errno in case of error
1103 int tb_port_lane_bonding_enable(struct tb_port *port)
1108 * Enable lane bonding for both links if not already enabled by
1109 * for example the boot firmware.
1111 ret = tb_port_get_link_width(port);
1113 ret = tb_port_set_link_width(port, 2);
1118 ret = tb_port_get_link_width(port->dual_link_port);
1120 ret = tb_port_set_link_width(port->dual_link_port, 2);
1125 ret = tb_port_set_lane_bonding(port, true);
1132 tb_port_set_link_width(port->dual_link_port, 1);
1134 tb_port_set_link_width(port, 1);
1139 * tb_port_lane_bonding_disable() - Disable bonding on port
1140 * @port: port to disable
1142 * Disable bonding by setting the link width of the port and the
1143 * other port in case of dual link port.
1145 void tb_port_lane_bonding_disable(struct tb_port *port)
1147 tb_port_set_lane_bonding(port, false);
1148 tb_port_set_link_width(port->dual_link_port, 1);
1149 tb_port_set_link_width(port, 1);
1153 * tb_port_wait_for_link_width() - Wait until link reaches specific width
1154 * @port: Port to wait for
1155 * @width: Expected link width (%1 or %2)
1156 * @timeout_msec: Timeout in ms how long to wait
1158 * Should be used after both ends of the link have been bonded (or
1159 * bonding has been disabled) to wait until the link actually reaches
1160 * the expected state. Returns %-ETIMEDOUT if the @width was not reached
1161 * within the given timeout, %0 if it did.
1163 int tb_port_wait_for_link_width(struct tb_port *port, int width,
1166 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1170 ret = tb_port_get_link_width(port);
1173 * Sometimes we get port locked error when
1174 * polling the lanes so we can ignore it and
1179 } else if (ret == width) {
1183 usleep_range(1000, 2000);
1184 } while (ktime_before(ktime_get(), timeout));
1189 static int tb_port_do_update_credits(struct tb_port *port)
1194 ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
1198 if (nfc_credits != port->config.nfc_credits) {
1201 total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
1202 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
1204 tb_port_dbg(port, "total credits changed %u -> %u\n",
1205 port->total_credits, total);
1207 port->config.nfc_credits = nfc_credits;
1208 port->total_credits = total;
1215 * tb_port_update_credits() - Re-read port total credits
1216 * @port: Port to update
1218 * After the link is bonded (or bonding was disabled) the port total
1219 * credits may change, so this function needs to be called to re-read
1220 * the credits. Updates also the second lane adapter.
1222 int tb_port_update_credits(struct tb_port *port)
1226 ret = tb_port_do_update_credits(port);
1229 return tb_port_do_update_credits(port->dual_link_port);
1232 static int __tb_port_pm_secondary_set(struct tb_port *port, bool secondary)
1237 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1238 port->cap_phy + LANE_ADP_CS_1, 1);
1243 phy |= LANE_ADP_CS_1_PMS;
1245 phy &= ~LANE_ADP_CS_1_PMS;
1247 return tb_port_write(port, &phy, TB_CFG_PORT,
1248 port->cap_phy + LANE_ADP_CS_1, 1);
1251 static int tb_port_pm_secondary_enable(struct tb_port *port)
1253 return __tb_port_pm_secondary_set(port, true);
1256 static int tb_port_pm_secondary_disable(struct tb_port *port)
1258 return __tb_port_pm_secondary_set(port, false);
1261 /* Called for USB4 or Titan Ridge routers only */
1262 static bool tb_port_clx_supported(struct tb_port *port, unsigned int clx_mask)
1267 /* Don't enable CLx in case of two single-lane links */
1268 if (!port->bonded && port->dual_link_port)
1271 /* Don't enable CLx in case of inter-domain link */
1275 if (tb_switch_is_usb4(port->sw)) {
1276 if (!usb4_port_clx_supported(port))
1278 } else if (!tb_lc_is_clx_supported(port)) {
1282 if (clx_mask & TB_CL1) {
1283 /* CL0s and CL1 are enabled and supported together */
1284 mask |= LANE_ADP_CS_0_CL0S_SUPPORT | LANE_ADP_CS_0_CL1_SUPPORT;
1286 if (clx_mask & TB_CL2)
1287 mask |= LANE_ADP_CS_0_CL2_SUPPORT;
1289 ret = tb_port_read(port, &val, TB_CFG_PORT,
1290 port->cap_phy + LANE_ADP_CS_0, 1);
1294 return !!(val & mask);
1297 static int __tb_port_clx_set(struct tb_port *port, enum tb_clx clx, bool enable)
1302 /* CL0s and CL1 are enabled and supported together */
1304 mask = LANE_ADP_CS_1_CL0S_ENABLE | LANE_ADP_CS_1_CL1_ENABLE;
1306 /* For now we support only CL0s and CL1. Not CL2 */
1309 ret = tb_port_read(port, &phy, TB_CFG_PORT,
1310 port->cap_phy + LANE_ADP_CS_1, 1);
1319 return tb_port_write(port, &phy, TB_CFG_PORT,
1320 port->cap_phy + LANE_ADP_CS_1, 1);
1323 static int tb_port_clx_disable(struct tb_port *port, enum tb_clx clx)
1325 return __tb_port_clx_set(port, clx, false);
1328 static int tb_port_clx_enable(struct tb_port *port, enum tb_clx clx)
1330 return __tb_port_clx_set(port, clx, true);
1333 static int tb_port_start_lane_initialization(struct tb_port *port)
1337 if (tb_switch_is_usb4(port->sw))
1340 ret = tb_lc_start_lane_initialization(port);
1341 return ret == -EINVAL ? 0 : ret;
1345 * Returns true if the port had something (router, XDomain) connected
1348 static bool tb_port_resume(struct tb_port *port)
1350 bool has_remote = tb_port_has_remote(port);
1353 usb4_port_device_resume(port->usb4);
1354 } else if (!has_remote) {
1356 * For disconnected downstream lane adapters start lane
1357 * initialization now so we detect future connects.
1359 * For XDomain start the lane initialzation now so the
1360 * link gets re-established.
1362 * This is only needed for non-USB4 ports.
1364 if (!tb_is_upstream_port(port) || port->xdomain)
1365 tb_port_start_lane_initialization(port);
1368 return has_remote || port->xdomain;
1372 * tb_port_is_enabled() - Is the adapter port enabled
1373 * @port: Port to check
1375 bool tb_port_is_enabled(struct tb_port *port)
1377 switch (port->config.type) {
1378 case TB_TYPE_PCIE_UP:
1379 case TB_TYPE_PCIE_DOWN:
1380 return tb_pci_port_is_enabled(port);
1382 case TB_TYPE_DP_HDMI_IN:
1383 case TB_TYPE_DP_HDMI_OUT:
1384 return tb_dp_port_is_enabled(port);
1386 case TB_TYPE_USB3_UP:
1387 case TB_TYPE_USB3_DOWN:
1388 return tb_usb3_port_is_enabled(port);
1396 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1397 * @port: USB3 adapter port to check
1399 bool tb_usb3_port_is_enabled(struct tb_port *port)
1403 if (tb_port_read(port, &data, TB_CFG_PORT,
1404 port->cap_adap + ADP_USB3_CS_0, 1))
1407 return !!(data & ADP_USB3_CS_0_PE);
1411 * tb_usb3_port_enable() - Enable USB3 adapter port
1412 * @port: USB3 adapter port to enable
1413 * @enable: Enable/disable the USB3 adapter
1415 int tb_usb3_port_enable(struct tb_port *port, bool enable)
1417 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1420 if (!port->cap_adap)
1422 return tb_port_write(port, &word, TB_CFG_PORT,
1423 port->cap_adap + ADP_USB3_CS_0, 1);
1427 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1428 * @port: PCIe port to check
1430 bool tb_pci_port_is_enabled(struct tb_port *port)
1434 if (tb_port_read(port, &data, TB_CFG_PORT,
1435 port->cap_adap + ADP_PCIE_CS_0, 1))
1438 return !!(data & ADP_PCIE_CS_0_PE);
1442 * tb_pci_port_enable() - Enable PCIe adapter port
1443 * @port: PCIe port to enable
1444 * @enable: Enable/disable the PCIe adapter
1446 int tb_pci_port_enable(struct tb_port *port, bool enable)
1448 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
1449 if (!port->cap_adap)
1451 return tb_port_write(port, &word, TB_CFG_PORT,
1452 port->cap_adap + ADP_PCIE_CS_0, 1);
1456 * tb_dp_port_hpd_is_active() - Is HPD already active
1457 * @port: DP out port to check
1459 * Checks if the DP OUT adapter port has HDP bit already set.
1461 int tb_dp_port_hpd_is_active(struct tb_port *port)
1466 ret = tb_port_read(port, &data, TB_CFG_PORT,
1467 port->cap_adap + ADP_DP_CS_2, 1);
1471 return !!(data & ADP_DP_CS_2_HDP);
1475 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1476 * @port: Port to clear HPD
1478 * If the DP IN port has HDP set, this function can be used to clear it.
1480 int tb_dp_port_hpd_clear(struct tb_port *port)
1485 ret = tb_port_read(port, &data, TB_CFG_PORT,
1486 port->cap_adap + ADP_DP_CS_3, 1);
1490 data |= ADP_DP_CS_3_HDPC;
1491 return tb_port_write(port, &data, TB_CFG_PORT,
1492 port->cap_adap + ADP_DP_CS_3, 1);
1496 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1497 * @port: DP IN/OUT port to set hops
1498 * @video: Video Hop ID
1499 * @aux_tx: AUX TX Hop ID
1500 * @aux_rx: AUX RX Hop ID
1502 * Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
1503 * router DP adapters too but does not program the values as the fields
1506 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1507 unsigned int aux_tx, unsigned int aux_rx)
1512 if (tb_switch_is_usb4(port->sw))
1515 ret = tb_port_read(port, data, TB_CFG_PORT,
1516 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1520 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1521 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1522 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1524 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1525 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1526 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1527 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1528 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1530 return tb_port_write(port, data, TB_CFG_PORT,
1531 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1535 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1536 * @port: DP adapter port to check
1538 bool tb_dp_port_is_enabled(struct tb_port *port)
1542 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
1546 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
1550 * tb_dp_port_enable() - Enables/disables DP paths of a port
1551 * @port: DP IN/OUT port
1552 * @enable: Enable/disable DP path
1554 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1555 * calling this function.
1557 int tb_dp_port_enable(struct tb_port *port, bool enable)
1562 ret = tb_port_read(port, data, TB_CFG_PORT,
1563 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1568 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
1570 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
1572 return tb_port_write(port, data, TB_CFG_PORT,
1573 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
1576 /* switch utility functions */
1578 static const char *tb_switch_generation_name(const struct tb_switch *sw)
1580 switch (sw->generation) {
1582 return "Thunderbolt 1";
1584 return "Thunderbolt 2";
1586 return "Thunderbolt 3";
1594 static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1596 const struct tb_regs_switch_header *regs = &sw->config;
1598 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1599 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1600 regs->revision, regs->thunderbolt_version);
1601 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
1602 tb_dbg(tb, " Config:\n");
1604 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
1605 regs->upstream_port_number, regs->depth,
1606 (((u64) regs->route_hi) << 32) | regs->route_lo,
1607 regs->enabled, regs->plug_events_delay);
1608 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
1609 regs->__unknown1, regs->__unknown4);
1613 * tb_switch_reset() - reconfigure route, enable and send TB_CFG_PKG_RESET
1614 * @sw: Switch to reset
1616 * Return: Returns 0 on success or an error code on failure.
1618 int tb_switch_reset(struct tb_switch *sw)
1620 struct tb_cfg_result res;
1622 if (sw->generation > 1)
1625 tb_sw_dbg(sw, "resetting switch\n");
1627 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1628 TB_CFG_SWITCH, 2, 2);
1631 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
1638 * tb_switch_wait_for_bit() - Wait for specified value of bits in offset
1639 * @sw: Router to read the offset value from
1640 * @offset: Offset in the router config space to read from
1641 * @bit: Bit mask in the offset to wait for
1642 * @value: Value of the bits to wait for
1643 * @timeout_msec: Timeout in ms how long to wait
1645 * Wait till the specified bits in specified offset reach specified value.
1646 * Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
1647 * within the given timeout or a negative errno in case of failure.
1649 int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
1650 u32 value, int timeout_msec)
1652 ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
1658 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
1662 if ((val & bit) == value)
1665 usleep_range(50, 100);
1666 } while (ktime_before(ktime_get(), timeout));
1672 * tb_plug_events_active() - enable/disable plug events on a switch
1674 * Also configures a sane plug_events_delay of 255ms.
1676 * Return: Returns 0 on success or an error code on failure.
1678 static int tb_plug_events_active(struct tb_switch *sw, bool active)
1683 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
1686 sw->config.plug_events_delay = 0xff;
1687 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1691 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1696 data = data & 0xFFFFFF83;
1697 switch (sw->config.device_id) {
1698 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1699 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1700 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1704 * Skip Alpine Ridge, it needs to have vendor
1705 * specific USB hotplug event enabled for the
1706 * internal xHCI to work.
1708 if (!tb_switch_is_alpine_ridge(sw))
1709 data |= TB_PLUG_EVENTS_USB_DISABLE;
1714 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1715 sw->cap_plug_events + 1, 1);
1718 static ssize_t authorized_show(struct device *dev,
1719 struct device_attribute *attr,
1722 struct tb_switch *sw = tb_to_switch(dev);
1724 return sprintf(buf, "%u\n", sw->authorized);
1727 static int disapprove_switch(struct device *dev, void *not_used)
1729 char *envp[] = { "AUTHORIZED=0", NULL };
1730 struct tb_switch *sw;
1732 sw = tb_to_switch(dev);
1733 if (sw && sw->authorized) {
1736 /* First children */
1737 ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
1741 ret = tb_domain_disapprove_switch(sw->tb, sw);
1746 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1752 static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1754 char envp_string[13];
1756 char *envp[] = { envp_string, NULL };
1758 if (!mutex_trylock(&sw->tb->lock))
1759 return restart_syscall();
1761 if (!!sw->authorized == !!val)
1765 /* Disapprove switch */
1768 ret = disapprove_switch(&sw->dev, NULL);
1773 /* Approve switch */
1776 ret = tb_domain_approve_switch_key(sw->tb, sw);
1778 ret = tb_domain_approve_switch(sw->tb, sw);
1781 /* Challenge switch */
1784 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1792 sw->authorized = val;
1794 * Notify status change to the userspace, informing the new
1795 * value of /sys/bus/thunderbolt/devices/.../authorized.
1797 sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
1798 kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
1802 mutex_unlock(&sw->tb->lock);
1806 static ssize_t authorized_store(struct device *dev,
1807 struct device_attribute *attr,
1808 const char *buf, size_t count)
1810 struct tb_switch *sw = tb_to_switch(dev);
1814 ret = kstrtouint(buf, 0, &val);
1820 pm_runtime_get_sync(&sw->dev);
1821 ret = tb_switch_set_authorized(sw, val);
1822 pm_runtime_mark_last_busy(&sw->dev);
1823 pm_runtime_put_autosuspend(&sw->dev);
1825 return ret ? ret : count;
1827 static DEVICE_ATTR_RW(authorized);
1829 static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1832 struct tb_switch *sw = tb_to_switch(dev);
1834 return sprintf(buf, "%u\n", sw->boot);
1836 static DEVICE_ATTR_RO(boot);
1838 static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1841 struct tb_switch *sw = tb_to_switch(dev);
1843 return sprintf(buf, "%#x\n", sw->device);
1845 static DEVICE_ATTR_RO(device);
1848 device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1850 struct tb_switch *sw = tb_to_switch(dev);
1852 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1854 static DEVICE_ATTR_RO(device_name);
1857 generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1859 struct tb_switch *sw = tb_to_switch(dev);
1861 return sprintf(buf, "%u\n", sw->generation);
1863 static DEVICE_ATTR_RO(generation);
1865 static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1868 struct tb_switch *sw = tb_to_switch(dev);
1871 if (!mutex_trylock(&sw->tb->lock))
1872 return restart_syscall();
1875 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1877 ret = sprintf(buf, "\n");
1879 mutex_unlock(&sw->tb->lock);
1883 static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1884 const char *buf, size_t count)
1886 struct tb_switch *sw = tb_to_switch(dev);
1887 u8 key[TB_SWITCH_KEY_SIZE];
1888 ssize_t ret = count;
1891 if (!strcmp(buf, "\n"))
1893 else if (hex2bin(key, buf, sizeof(key)))
1896 if (!mutex_trylock(&sw->tb->lock))
1897 return restart_syscall();
1899 if (sw->authorized) {
1906 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1912 mutex_unlock(&sw->tb->lock);
1915 static DEVICE_ATTR(key, 0600, key_show, key_store);
1917 static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1920 struct tb_switch *sw = tb_to_switch(dev);
1922 return sprintf(buf, "%u.0 Gb/s\n", sw->link_speed);
1926 * Currently all lanes must run at the same speed but we expose here
1927 * both directions to allow possible asymmetric links in the future.
1929 static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1930 static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1932 static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1935 struct tb_switch *sw = tb_to_switch(dev);
1937 return sprintf(buf, "%u\n", sw->link_width);
1941 * Currently link has same amount of lanes both directions (1 or 2) but
1942 * expose them separately to allow possible asymmetric links in the future.
1944 static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1945 static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1947 static ssize_t nvm_authenticate_show(struct device *dev,
1948 struct device_attribute *attr, char *buf)
1950 struct tb_switch *sw = tb_to_switch(dev);
1953 nvm_get_auth_status(sw, &status);
1954 return sprintf(buf, "%#x\n", status);
1957 static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1960 struct tb_switch *sw = tb_to_switch(dev);
1963 pm_runtime_get_sync(&sw->dev);
1965 if (!mutex_trylock(&sw->tb->lock)) {
1966 ret = restart_syscall();
1970 /* If NVMem devices are not yet added */
1976 ret = kstrtoint(buf, 10, &val);
1980 /* Always clear the authentication status */
1981 nvm_clear_auth_status(sw);
1984 if (val == AUTHENTICATE_ONLY) {
1988 ret = nvm_authenticate(sw, true);
1990 if (!sw->nvm->flushed) {
1991 if (!sw->nvm->buf) {
1996 ret = nvm_validate_and_write(sw);
1997 if (ret || val == WRITE_ONLY)
2000 if (val == WRITE_AND_AUTHENTICATE) {
2002 ret = tb_lc_force_power(sw);
2004 ret = nvm_authenticate(sw, false);
2010 mutex_unlock(&sw->tb->lock);
2012 pm_runtime_mark_last_busy(&sw->dev);
2013 pm_runtime_put_autosuspend(&sw->dev);
2018 static ssize_t nvm_authenticate_store(struct device *dev,
2019 struct device_attribute *attr, const char *buf, size_t count)
2021 int ret = nvm_authenticate_sysfs(dev, buf, false);
2026 static DEVICE_ATTR_RW(nvm_authenticate);
2028 static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
2029 struct device_attribute *attr, char *buf)
2031 return nvm_authenticate_show(dev, attr, buf);
2034 static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
2035 struct device_attribute *attr, const char *buf, size_t count)
2039 ret = nvm_authenticate_sysfs(dev, buf, true);
2040 return ret ? ret : count;
2042 static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
2044 static ssize_t nvm_version_show(struct device *dev,
2045 struct device_attribute *attr, char *buf)
2047 struct tb_switch *sw = tb_to_switch(dev);
2050 if (!mutex_trylock(&sw->tb->lock))
2051 return restart_syscall();
2058 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
2060 mutex_unlock(&sw->tb->lock);
2064 static DEVICE_ATTR_RO(nvm_version);
2066 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
2069 struct tb_switch *sw = tb_to_switch(dev);
2071 return sprintf(buf, "%#x\n", sw->vendor);
2073 static DEVICE_ATTR_RO(vendor);
2076 vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
2078 struct tb_switch *sw = tb_to_switch(dev);
2080 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
2082 static DEVICE_ATTR_RO(vendor_name);
2084 static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
2087 struct tb_switch *sw = tb_to_switch(dev);
2089 return sprintf(buf, "%pUb\n", sw->uuid);
2091 static DEVICE_ATTR_RO(unique_id);
2093 static struct attribute *switch_attrs[] = {
2094 &dev_attr_authorized.attr,
2095 &dev_attr_boot.attr,
2096 &dev_attr_device.attr,
2097 &dev_attr_device_name.attr,
2098 &dev_attr_generation.attr,
2100 &dev_attr_nvm_authenticate.attr,
2101 &dev_attr_nvm_authenticate_on_disconnect.attr,
2102 &dev_attr_nvm_version.attr,
2103 &dev_attr_rx_speed.attr,
2104 &dev_attr_rx_lanes.attr,
2105 &dev_attr_tx_speed.attr,
2106 &dev_attr_tx_lanes.attr,
2107 &dev_attr_vendor.attr,
2108 &dev_attr_vendor_name.attr,
2109 &dev_attr_unique_id.attr,
2113 static umode_t switch_attr_is_visible(struct kobject *kobj,
2114 struct attribute *attr, int n)
2116 struct device *dev = kobj_to_dev(kobj);
2117 struct tb_switch *sw = tb_to_switch(dev);
2119 if (attr == &dev_attr_authorized.attr) {
2120 if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
2121 sw->tb->security_level == TB_SECURITY_DPONLY)
2123 } else if (attr == &dev_attr_device.attr) {
2126 } else if (attr == &dev_attr_device_name.attr) {
2127 if (!sw->device_name)
2129 } else if (attr == &dev_attr_vendor.attr) {
2132 } else if (attr == &dev_attr_vendor_name.attr) {
2133 if (!sw->vendor_name)
2135 } else if (attr == &dev_attr_key.attr) {
2137 sw->tb->security_level == TB_SECURITY_SECURE &&
2138 sw->security_level == TB_SECURITY_SECURE)
2141 } else if (attr == &dev_attr_rx_speed.attr ||
2142 attr == &dev_attr_rx_lanes.attr ||
2143 attr == &dev_attr_tx_speed.attr ||
2144 attr == &dev_attr_tx_lanes.attr) {
2148 } else if (attr == &dev_attr_nvm_authenticate.attr) {
2149 if (nvm_upgradeable(sw))
2152 } else if (attr == &dev_attr_nvm_version.attr) {
2153 if (nvm_readable(sw))
2156 } else if (attr == &dev_attr_boot.attr) {
2160 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
2161 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
2166 return sw->safe_mode ? 0 : attr->mode;
2169 static const struct attribute_group switch_group = {
2170 .is_visible = switch_attr_is_visible,
2171 .attrs = switch_attrs,
2174 static const struct attribute_group *switch_groups[] = {
2179 static void tb_switch_release(struct device *dev)
2181 struct tb_switch *sw = tb_to_switch(dev);
2182 struct tb_port *port;
2184 dma_port_free(sw->dma_port);
2186 tb_switch_for_each_port(sw, port) {
2187 ida_destroy(&port->in_hopids);
2188 ida_destroy(&port->out_hopids);
2192 kfree(sw->device_name);
2193 kfree(sw->vendor_name);
2200 static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
2202 struct tb_switch *sw = tb_to_switch(dev);
2205 if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
2206 if (add_uevent_var(env, "USB4_VERSION=1.0"))
2210 if (!tb_route(sw)) {
2213 const struct tb_port *port;
2216 /* Device is hub if it has any downstream ports */
2217 tb_switch_for_each_port(sw, port) {
2218 if (!port->disabled && !tb_is_upstream_port(port) &&
2219 tb_port_is_null(port)) {
2225 type = hub ? "hub" : "device";
2228 if (add_uevent_var(env, "USB4_TYPE=%s", type))
2234 * Currently only need to provide the callbacks. Everything else is handled
2235 * in the connection manager.
2237 static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
2239 struct tb_switch *sw = tb_to_switch(dev);
2240 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2242 if (cm_ops->runtime_suspend_switch)
2243 return cm_ops->runtime_suspend_switch(sw);
2248 static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
2250 struct tb_switch *sw = tb_to_switch(dev);
2251 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
2253 if (cm_ops->runtime_resume_switch)
2254 return cm_ops->runtime_resume_switch(sw);
2258 static const struct dev_pm_ops tb_switch_pm_ops = {
2259 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
2263 struct device_type tb_switch_type = {
2264 .name = "thunderbolt_device",
2265 .release = tb_switch_release,
2266 .uevent = tb_switch_uevent,
2267 .pm = &tb_switch_pm_ops,
2270 static int tb_switch_get_generation(struct tb_switch *sw)
2272 switch (sw->config.device_id) {
2273 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
2274 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
2275 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
2276 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
2277 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
2278 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
2279 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
2280 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
2283 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
2284 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
2285 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
2288 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
2289 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
2290 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
2291 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
2292 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
2293 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
2294 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
2295 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
2296 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
2297 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
2301 if (tb_switch_is_usb4(sw))
2305 * For unknown switches assume generation to be 1 to be
2308 tb_sw_warn(sw, "unsupported switch device id %#x\n",
2309 sw->config.device_id);
2314 static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
2318 if (tb_switch_is_usb4(sw) ||
2319 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
2320 max_depth = USB4_SWITCH_MAX_DEPTH;
2322 max_depth = TB_SWITCH_MAX_DEPTH;
2324 return depth > max_depth;
2328 * tb_switch_alloc() - allocate a switch
2329 * @tb: Pointer to the owning domain
2330 * @parent: Parent device for this switch
2331 * @route: Route string for this switch
2333 * Allocates and initializes a switch. Will not upload configuration to
2334 * the switch. For that you need to call tb_switch_configure()
2335 * separately. The returned switch should be released by calling
2338 * Return: Pointer to the allocated switch or ERR_PTR() in case of
2341 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
2344 struct tb_switch *sw;
2348 /* Unlock the downstream port so we can access the switch below */
2350 struct tb_switch *parent_sw = tb_to_switch(parent);
2351 struct tb_port *down;
2353 down = tb_port_at(route, parent_sw);
2354 tb_port_unlock(down);
2357 depth = tb_route_length(route);
2359 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
2360 if (upstream_port < 0)
2361 return ERR_PTR(upstream_port);
2363 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2365 return ERR_PTR(-ENOMEM);
2368 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
2370 goto err_free_sw_ports;
2372 sw->generation = tb_switch_get_generation(sw);
2374 tb_dbg(tb, "current switch config:\n");
2375 tb_dump_switch(tb, sw);
2377 /* configure switch */
2378 sw->config.upstream_port_number = upstream_port;
2379 sw->config.depth = depth;
2380 sw->config.route_hi = upper_32_bits(route);
2381 sw->config.route_lo = lower_32_bits(route);
2382 sw->config.enabled = 0;
2384 /* Make sure we do not exceed maximum topology limit */
2385 if (tb_switch_exceeds_max_depth(sw, depth)) {
2386 ret = -EADDRNOTAVAIL;
2387 goto err_free_sw_ports;
2390 /* initialize ports */
2391 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
2395 goto err_free_sw_ports;
2398 for (i = 0; i <= sw->config.max_port_number; i++) {
2399 /* minimum setup for tb_find_cap and tb_drom_read to work */
2400 sw->ports[i].sw = sw;
2401 sw->ports[i].port = i;
2403 /* Control port does not need HopID allocation */
2405 ida_init(&sw->ports[i].in_hopids);
2406 ida_init(&sw->ports[i].out_hopids);
2410 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
2412 sw->cap_plug_events = ret;
2414 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
2416 sw->cap_vsec_tmu = ret;
2418 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
2422 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
2426 /* Root switch is always authorized */
2428 sw->authorized = true;
2430 device_initialize(&sw->dev);
2431 sw->dev.parent = parent;
2432 sw->dev.bus = &tb_bus_type;
2433 sw->dev.type = &tb_switch_type;
2434 sw->dev.groups = switch_groups;
2435 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2443 return ERR_PTR(ret);
2447 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2448 * @tb: Pointer to the owning domain
2449 * @parent: Parent device for this switch
2450 * @route: Route string for this switch
2452 * This creates a switch in safe mode. This means the switch pretty much
2453 * lacks all capabilities except DMA configuration port before it is
2454 * flashed with a valid NVM firmware.
2456 * The returned switch must be released by calling tb_switch_put().
2458 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
2461 tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2463 struct tb_switch *sw;
2465 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2467 return ERR_PTR(-ENOMEM);
2470 sw->config.depth = tb_route_length(route);
2471 sw->config.route_hi = upper_32_bits(route);
2472 sw->config.route_lo = lower_32_bits(route);
2473 sw->safe_mode = true;
2475 device_initialize(&sw->dev);
2476 sw->dev.parent = parent;
2477 sw->dev.bus = &tb_bus_type;
2478 sw->dev.type = &tb_switch_type;
2479 sw->dev.groups = switch_groups;
2480 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2486 * tb_switch_configure() - Uploads configuration to the switch
2487 * @sw: Switch to configure
2489 * Call this function before the switch is added to the system. It will
2490 * upload configuration to the switch and makes it available for the
2491 * connection manager to use. Can be called to the switch again after
2492 * resume from low power states to re-initialize it.
2494 * Return: %0 in case of success and negative errno in case of failure
2496 int tb_switch_configure(struct tb_switch *sw)
2498 struct tb *tb = sw->tb;
2502 route = tb_route(sw);
2504 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
2505 sw->config.enabled ? "restoring" : "initializing", route,
2506 tb_route_length(route), sw->config.upstream_port_number);
2508 sw->config.enabled = 1;
2510 if (tb_switch_is_usb4(sw)) {
2512 * For USB4 devices, we need to program the CM version
2513 * accordingly so that it knows to expose all the
2514 * additional capabilities.
2516 sw->config.cmuv = USB4_VERSION_1_0;
2518 /* Enumerate the switch */
2519 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2524 ret = usb4_switch_setup(sw);
2526 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2527 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2528 sw->config.vendor_id);
2530 if (!sw->cap_plug_events) {
2531 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2535 /* Enumerate the switch */
2536 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2542 return tb_plug_events_active(sw, true);
2545 static int tb_switch_set_uuid(struct tb_switch *sw)
2554 if (tb_switch_is_usb4(sw)) {
2555 ret = usb4_switch_read_uid(sw, &sw->uid);
2561 * The newer controllers include fused UUID as part of
2562 * link controller specific registers
2564 ret = tb_lc_read_uuid(sw, uuid);
2574 * ICM generates UUID based on UID and fills the upper
2575 * two words with ones. This is not strictly following
2576 * UUID format but we want to be compatible with it so
2577 * we do the same here.
2579 uuid[0] = sw->uid & 0xffffffff;
2580 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2581 uuid[2] = 0xffffffff;
2582 uuid[3] = 0xffffffff;
2585 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
2591 static int tb_switch_add_dma_port(struct tb_switch *sw)
2596 switch (sw->generation) {
2598 /* Only root switch can be upgraded */
2605 ret = tb_switch_set_uuid(sw);
2612 * DMA port is the only thing available when the switch
2620 if (sw->no_nvm_upgrade)
2623 if (tb_switch_is_usb4(sw)) {
2624 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2629 tb_sw_info(sw, "switch flash authentication failed\n");
2630 nvm_set_auth_status(sw, status);
2636 /* Root switch DMA port requires running firmware */
2637 if (!tb_route(sw) && !tb_switch_is_icm(sw))
2640 sw->dma_port = dma_port_alloc(sw);
2645 * If there is status already set then authentication failed
2646 * when the dma_port_flash_update_auth() returned. Power cycling
2647 * is not needed (it was done already) so only thing we do here
2648 * is to unblock runtime PM of the root port.
2650 nvm_get_auth_status(sw, &status);
2653 nvm_authenticate_complete_dma_port(sw);
2658 * Check status of the previous flash authentication. If there
2659 * is one we need to power cycle the switch in any case to make
2660 * it functional again.
2662 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2666 /* Now we can allow root port to suspend again */
2668 nvm_authenticate_complete_dma_port(sw);
2671 tb_sw_info(sw, "switch flash authentication failed\n");
2672 nvm_set_auth_status(sw, status);
2675 tb_sw_info(sw, "power cycling the switch now\n");
2676 dma_port_power_cycle(sw->dma_port);
2679 * We return error here which causes the switch adding failure.
2680 * It should appear back after power cycle is complete.
2685 static void tb_switch_default_link_ports(struct tb_switch *sw)
2689 for (i = 1; i <= sw->config.max_port_number; i++) {
2690 struct tb_port *port = &sw->ports[i];
2691 struct tb_port *subordinate;
2693 if (!tb_port_is_null(port))
2696 /* Check for the subordinate port */
2697 if (i == sw->config.max_port_number ||
2698 !tb_port_is_null(&sw->ports[i + 1]))
2701 /* Link them if not already done so (by DROM) */
2702 subordinate = &sw->ports[i + 1];
2703 if (!port->dual_link_port && !subordinate->dual_link_port) {
2705 port->dual_link_port = subordinate;
2706 subordinate->link_nr = 1;
2707 subordinate->dual_link_port = port;
2709 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2710 port->port, subordinate->port);
2715 static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2717 const struct tb_port *up = tb_upstream_port(sw);
2719 if (!up->dual_link_port || !up->dual_link_port->remote)
2722 if (tb_switch_is_usb4(sw))
2723 return usb4_switch_lane_bonding_possible(sw);
2724 return tb_lc_lane_bonding_possible(sw);
2727 static int tb_switch_update_link_attributes(struct tb_switch *sw)
2730 bool change = false;
2733 if (!tb_route(sw) || tb_switch_is_icm(sw))
2736 up = tb_upstream_port(sw);
2738 ret = tb_port_get_link_speed(up);
2741 if (sw->link_speed != ret)
2743 sw->link_speed = ret;
2745 ret = tb_port_get_link_width(up);
2748 if (sw->link_width != ret)
2750 sw->link_width = ret;
2752 /* Notify userspace that there is possible link attribute change */
2753 if (device_is_registered(&sw->dev) && change)
2754 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2760 * tb_switch_lane_bonding_enable() - Enable lane bonding
2761 * @sw: Switch to enable lane bonding
2763 * Connection manager can call this function to enable lane bonding of a
2764 * switch. If conditions are correct and both switches support the feature,
2765 * lanes are bonded. It is safe to call this to any switch.
2767 int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2769 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2770 struct tb_port *up, *down;
2771 u64 route = tb_route(sw);
2777 if (!tb_switch_lane_bonding_possible(sw))
2780 up = tb_upstream_port(sw);
2781 down = tb_port_at(route, parent);
2783 if (!tb_port_is_width_supported(up, 2) ||
2784 !tb_port_is_width_supported(down, 2))
2787 ret = tb_port_lane_bonding_enable(up);
2789 tb_port_warn(up, "failed to enable lane bonding\n");
2793 ret = tb_port_lane_bonding_enable(down);
2795 tb_port_warn(down, "failed to enable lane bonding\n");
2796 tb_port_lane_bonding_disable(up);
2800 ret = tb_port_wait_for_link_width(down, 2, 100);
2802 tb_port_warn(down, "timeout enabling lane bonding\n");
2806 tb_port_update_credits(down);
2807 tb_port_update_credits(up);
2808 tb_switch_update_link_attributes(sw);
2810 tb_sw_dbg(sw, "lane bonding enabled\n");
2815 * tb_switch_lane_bonding_disable() - Disable lane bonding
2816 * @sw: Switch whose lane bonding to disable
2818 * Disables lane bonding between @sw and parent. This can be called even
2819 * if lanes were not bonded originally.
2821 void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2823 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2824 struct tb_port *up, *down;
2829 up = tb_upstream_port(sw);
2833 down = tb_port_at(tb_route(sw), parent);
2835 tb_port_lane_bonding_disable(up);
2836 tb_port_lane_bonding_disable(down);
2839 * It is fine if we get other errors as the router might have
2842 if (tb_port_wait_for_link_width(down, 1, 100) == -ETIMEDOUT)
2843 tb_sw_warn(sw, "timeout disabling lane bonding\n");
2845 tb_port_update_credits(down);
2846 tb_port_update_credits(up);
2847 tb_switch_update_link_attributes(sw);
2849 tb_sw_dbg(sw, "lane bonding disabled\n");
2853 * tb_switch_configure_link() - Set link configured
2854 * @sw: Switch whose link is configured
2856 * Sets the link upstream from @sw configured (from both ends) so that
2857 * it will not be disconnected when the domain exits sleep. Can be
2858 * called for any switch.
2860 * It is recommended that this is called after lane bonding is enabled.
2862 * Returns %0 on success and negative errno in case of error.
2864 int tb_switch_configure_link(struct tb_switch *sw)
2866 struct tb_port *up, *down;
2869 if (!tb_route(sw) || tb_switch_is_icm(sw))
2872 up = tb_upstream_port(sw);
2873 if (tb_switch_is_usb4(up->sw))
2874 ret = usb4_port_configure(up);
2876 ret = tb_lc_configure_port(up);
2881 if (tb_switch_is_usb4(down->sw))
2882 return usb4_port_configure(down);
2883 return tb_lc_configure_port(down);
2887 * tb_switch_unconfigure_link() - Unconfigure link
2888 * @sw: Switch whose link is unconfigured
2890 * Sets the link unconfigured so the @sw will be disconnected if the
2891 * domain exists sleep.
2893 void tb_switch_unconfigure_link(struct tb_switch *sw)
2895 struct tb_port *up, *down;
2897 if (sw->is_unplugged)
2899 if (!tb_route(sw) || tb_switch_is_icm(sw))
2902 up = tb_upstream_port(sw);
2903 if (tb_switch_is_usb4(up->sw))
2904 usb4_port_unconfigure(up);
2906 tb_lc_unconfigure_port(up);
2909 if (tb_switch_is_usb4(down->sw))
2910 usb4_port_unconfigure(down);
2912 tb_lc_unconfigure_port(down);
2915 static void tb_switch_credits_init(struct tb_switch *sw)
2917 if (tb_switch_is_icm(sw))
2919 if (!tb_switch_is_usb4(sw))
2921 if (usb4_switch_credits_init(sw))
2922 tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
2926 * tb_switch_add() - Add a switch to the domain
2927 * @sw: Switch to add
2929 * This is the last step in adding switch to the domain. It will read
2930 * identification information from DROM and initializes ports so that
2931 * they can be used to connect other switches. The switch will be
2932 * exposed to the userspace when this function successfully returns. To
2933 * remove and release the switch, call tb_switch_remove().
2935 * Return: %0 in case of success and negative errno in case of failure
2937 int tb_switch_add(struct tb_switch *sw)
2942 * Initialize DMA control port now before we read DROM. Recent
2943 * host controllers have more complete DROM on NVM that includes
2944 * vendor and model identification strings which we then expose
2945 * to the userspace. NVM can be accessed through DMA
2946 * configuration based mailbox.
2948 ret = tb_switch_add_dma_port(sw);
2950 dev_err(&sw->dev, "failed to add DMA port\n");
2954 if (!sw->safe_mode) {
2955 tb_switch_credits_init(sw);
2958 ret = tb_drom_read(sw);
2960 dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
2961 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
2963 tb_check_quirks(sw);
2965 ret = tb_switch_set_uuid(sw);
2967 dev_err(&sw->dev, "failed to set UUID\n");
2971 for (i = 0; i <= sw->config.max_port_number; i++) {
2972 if (sw->ports[i].disabled) {
2973 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
2976 ret = tb_init_port(&sw->ports[i]);
2978 dev_err(&sw->dev, "failed to initialize port %d\n", i);
2983 tb_switch_default_link_ports(sw);
2985 ret = tb_switch_update_link_attributes(sw);
2989 ret = tb_switch_tmu_init(sw);
2994 ret = device_add(&sw->dev);
2996 dev_err(&sw->dev, "failed to add device: %d\n", ret);
3001 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
3002 sw->vendor, sw->device);
3003 if (sw->vendor_name && sw->device_name)
3004 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
3008 ret = usb4_switch_add_ports(sw);
3010 dev_err(&sw->dev, "failed to add USB4 ports\n");
3014 ret = tb_switch_nvm_add(sw);
3016 dev_err(&sw->dev, "failed to add NVM devices\n");
3021 * Thunderbolt routers do not generate wakeups themselves but
3022 * they forward wakeups from tunneled protocols, so enable it
3025 device_init_wakeup(&sw->dev, true);
3027 pm_runtime_set_active(&sw->dev);
3029 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
3030 pm_runtime_use_autosuspend(&sw->dev);
3031 pm_runtime_mark_last_busy(&sw->dev);
3032 pm_runtime_enable(&sw->dev);
3033 pm_request_autosuspend(&sw->dev);
3036 tb_switch_debugfs_init(sw);
3040 usb4_switch_remove_ports(sw);
3042 device_del(&sw->dev);
3048 * tb_switch_remove() - Remove and release a switch
3049 * @sw: Switch to remove
3051 * This will remove the switch from the domain and release it after last
3052 * reference count drops to zero. If there are switches connected below
3053 * this switch, they will be removed as well.
3055 void tb_switch_remove(struct tb_switch *sw)
3057 struct tb_port *port;
3059 tb_switch_debugfs_remove(sw);
3062 pm_runtime_get_sync(&sw->dev);
3063 pm_runtime_disable(&sw->dev);
3066 /* port 0 is the switch itself and never has a remote */
3067 tb_switch_for_each_port(sw, port) {
3068 if (tb_port_has_remote(port)) {
3069 tb_switch_remove(port->remote->sw);
3070 port->remote = NULL;
3071 } else if (port->xdomain) {
3072 tb_xdomain_remove(port->xdomain);
3073 port->xdomain = NULL;
3076 /* Remove any downstream retimers */
3077 tb_retimer_remove_all(port);
3080 if (!sw->is_unplugged)
3081 tb_plug_events_active(sw, false);
3083 tb_switch_nvm_remove(sw);
3084 usb4_switch_remove_ports(sw);
3087 dev_info(&sw->dev, "device disconnected\n");
3088 device_unregister(&sw->dev);
3092 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
3093 * @sw: Router to mark unplugged
3095 void tb_sw_set_unplugged(struct tb_switch *sw)
3097 struct tb_port *port;
3099 if (sw == sw->tb->root_switch) {
3100 tb_sw_WARN(sw, "cannot unplug root switch\n");
3103 if (sw->is_unplugged) {
3104 tb_sw_WARN(sw, "is_unplugged already set\n");
3107 sw->is_unplugged = true;
3108 tb_switch_for_each_port(sw, port) {
3109 if (tb_port_has_remote(port))
3110 tb_sw_set_unplugged(port->remote->sw);
3111 else if (port->xdomain)
3112 port->xdomain->is_unplugged = true;
3116 static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
3119 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
3121 tb_sw_dbg(sw, "disabling wakeup\n");
3123 if (tb_switch_is_usb4(sw))
3124 return usb4_switch_set_wake(sw, flags);
3125 return tb_lc_set_wake(sw, flags);
3128 int tb_switch_resume(struct tb_switch *sw)
3130 struct tb_port *port;
3133 tb_sw_dbg(sw, "resuming switch\n");
3136 * Check for UID of the connected switches except for root
3137 * switch which we assume cannot be removed.
3143 * Check first that we can still read the switch config
3144 * space. It may be that there is now another domain
3147 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
3149 tb_sw_info(sw, "switch not present anymore\n");
3153 /* We don't have any way to confirm this was the same device */
3157 if (tb_switch_is_usb4(sw))
3158 err = usb4_switch_read_uid(sw, &uid);
3160 err = tb_drom_read_uid_only(sw, &uid);
3162 tb_sw_warn(sw, "uid read failed\n");
3165 if (sw->uid != uid) {
3167 "changed while suspended (uid %#llx -> %#llx)\n",
3173 err = tb_switch_configure(sw);
3178 tb_switch_set_wake(sw, 0);
3180 err = tb_switch_tmu_init(sw);
3184 /* check for surviving downstream switches */
3185 tb_switch_for_each_port(sw, port) {
3186 if (!tb_port_is_null(port))
3189 if (!tb_port_resume(port))
3192 if (tb_wait_for_port(port, true) <= 0) {
3194 "lost during suspend, disconnecting\n");
3195 if (tb_port_has_remote(port))
3196 tb_sw_set_unplugged(port->remote->sw);
3197 else if (port->xdomain)
3198 port->xdomain->is_unplugged = true;
3201 * Always unlock the port so the downstream
3202 * switch/domain is accessible.
3204 if (tb_port_unlock(port))
3205 tb_port_warn(port, "failed to unlock port\n");
3206 if (port->remote && tb_switch_resume(port->remote->sw)) {
3208 "lost during suspend, disconnecting\n");
3209 tb_sw_set_unplugged(port->remote->sw);
3217 * tb_switch_suspend() - Put a switch to sleep
3218 * @sw: Switch to suspend
3219 * @runtime: Is this runtime suspend or system sleep
3221 * Suspends router and all its children. Enables wakes according to
3222 * value of @runtime and then sets sleep bit for the router. If @sw is
3223 * host router the domain is ready to go to sleep once this function
3226 void tb_switch_suspend(struct tb_switch *sw, bool runtime)
3228 unsigned int flags = 0;
3229 struct tb_port *port;
3232 tb_sw_dbg(sw, "suspending switch\n");
3235 * Actually only needed for Titan Ridge but for simplicity can be
3236 * done for USB4 device too as CLx is re-enabled at resume.
3237 * CL0s and CL1 are enabled and supported together.
3239 if (tb_switch_is_clx_enabled(sw, TB_CL1)) {
3240 if (tb_switch_disable_clx(sw, TB_CL1))
3241 tb_sw_warn(sw, "failed to disable %s on upstream port\n",
3242 tb_switch_clx_name(TB_CL1));
3245 err = tb_plug_events_active(sw, false);
3249 tb_switch_for_each_port(sw, port) {
3250 if (tb_port_has_remote(port))
3251 tb_switch_suspend(port->remote->sw, runtime);
3255 /* Trigger wake when something is plugged in/out */
3256 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
3257 flags |= TB_WAKE_ON_USB4;
3258 flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
3259 } else if (device_may_wakeup(&sw->dev)) {
3260 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
3263 tb_switch_set_wake(sw, flags);
3265 if (tb_switch_is_usb4(sw))
3266 usb4_switch_set_sleep(sw);
3268 tb_lc_set_sleep(sw);
3272 * tb_switch_query_dp_resource() - Query availability of DP resource
3273 * @sw: Switch whose DP resource is queried
3276 * Queries availability of DP resource for DP tunneling using switch
3277 * specific means. Returns %true if resource is available.
3279 bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
3281 if (tb_switch_is_usb4(sw))
3282 return usb4_switch_query_dp_resource(sw, in);
3283 return tb_lc_dp_sink_query(sw, in);
3287 * tb_switch_alloc_dp_resource() - Allocate available DP resource
3288 * @sw: Switch whose DP resource is allocated
3291 * Allocates DP resource for DP tunneling. The resource must be
3292 * available for this to succeed (see tb_switch_query_dp_resource()).
3293 * Returns %0 in success and negative errno otherwise.
3295 int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3299 if (tb_switch_is_usb4(sw))
3300 ret = usb4_switch_alloc_dp_resource(sw, in);
3302 ret = tb_lc_dp_sink_alloc(sw, in);
3305 tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
3308 tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
3314 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
3315 * @sw: Switch whose DP resource is de-allocated
3318 * De-allocates DP resource that was previously allocated for DP
3321 void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
3325 if (tb_switch_is_usb4(sw))
3326 ret = usb4_switch_dealloc_dp_resource(sw, in);
3328 ret = tb_lc_dp_sink_dealloc(sw, in);
3331 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
3334 tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
3337 struct tb_sw_lookup {
3345 static int tb_switch_match(struct device *dev, const void *data)
3347 struct tb_switch *sw = tb_to_switch(dev);
3348 const struct tb_sw_lookup *lookup = data;
3352 if (sw->tb != lookup->tb)
3356 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
3358 if (lookup->route) {
3359 return sw->config.route_lo == lower_32_bits(lookup->route) &&
3360 sw->config.route_hi == upper_32_bits(lookup->route);
3363 /* Root switch is matched only by depth */
3367 return sw->link == lookup->link && sw->depth == lookup->depth;
3371 * tb_switch_find_by_link_depth() - Find switch by link and depth
3372 * @tb: Domain the switch belongs
3373 * @link: Link number the switch is connected
3374 * @depth: Depth of the switch in link
3376 * Returned switch has reference count increased so the caller needs to
3377 * call tb_switch_put() when done with the switch.
3379 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
3381 struct tb_sw_lookup lookup;
3384 memset(&lookup, 0, sizeof(lookup));
3387 lookup.depth = depth;
3389 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3391 return tb_to_switch(dev);
3397 * tb_switch_find_by_uuid() - Find switch by UUID
3398 * @tb: Domain the switch belongs
3399 * @uuid: UUID to look for
3401 * Returned switch has reference count increased so the caller needs to
3402 * call tb_switch_put() when done with the switch.
3404 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
3406 struct tb_sw_lookup lookup;
3409 memset(&lookup, 0, sizeof(lookup));
3413 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3415 return tb_to_switch(dev);
3421 * tb_switch_find_by_route() - Find switch by route string
3422 * @tb: Domain the switch belongs
3423 * @route: Route string to look for
3425 * Returned switch has reference count increased so the caller needs to
3426 * call tb_switch_put() when done with the switch.
3428 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
3430 struct tb_sw_lookup lookup;
3434 return tb_switch_get(tb->root_switch);
3436 memset(&lookup, 0, sizeof(lookup));
3438 lookup.route = route;
3440 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
3442 return tb_to_switch(dev);
3448 * tb_switch_find_port() - return the first port of @type on @sw or NULL
3449 * @sw: Switch to find the port from
3450 * @type: Port type to look for
3452 struct tb_port *tb_switch_find_port(struct tb_switch *sw,
3453 enum tb_port_type type)
3455 struct tb_port *port;
3457 tb_switch_for_each_port(sw, port) {
3458 if (port->config.type == type)
3465 static int tb_switch_pm_secondary_resolve(struct tb_switch *sw)
3467 struct tb_switch *parent = tb_switch_parent(sw);
3468 struct tb_port *up, *down;
3474 up = tb_upstream_port(sw);
3475 down = tb_port_at(tb_route(sw), parent);
3476 ret = tb_port_pm_secondary_enable(up);
3480 return tb_port_pm_secondary_disable(down);
3483 static int __tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3485 struct tb_switch *parent = tb_switch_parent(sw);
3486 bool up_clx_support, down_clx_support;
3487 struct tb_port *up, *down;
3490 if (!tb_switch_is_clx_supported(sw))
3494 * Enable CLx for host router's downstream port as part of the
3495 * downstream router enabling procedure.
3500 /* Enable CLx only for first hop router (depth = 1) */
3501 if (tb_route(parent))
3504 ret = tb_switch_pm_secondary_resolve(sw);
3508 up = tb_upstream_port(sw);
3509 down = tb_port_at(tb_route(sw), parent);
3511 up_clx_support = tb_port_clx_supported(up, clx);
3512 down_clx_support = tb_port_clx_supported(down, clx);
3514 tb_port_dbg(up, "%s %ssupported\n", tb_switch_clx_name(clx),
3515 up_clx_support ? "" : "not ");
3516 tb_port_dbg(down, "%s %ssupported\n", tb_switch_clx_name(clx),
3517 down_clx_support ? "" : "not ");
3519 if (!up_clx_support || !down_clx_support)
3522 ret = tb_port_clx_enable(up, clx);
3526 ret = tb_port_clx_enable(down, clx);
3528 tb_port_clx_disable(up, clx);
3532 ret = tb_switch_mask_clx_objections(sw);
3534 tb_port_clx_disable(up, clx);
3535 tb_port_clx_disable(down, clx);
3541 tb_port_dbg(up, "%s enabled\n", tb_switch_clx_name(clx));
3546 * tb_switch_enable_clx() - Enable CLx on upstream port of specified router
3547 * @sw: Router to enable CLx for
3548 * @clx: The CLx state to enable
3550 * Enable CLx state only for first hop router. That is the most common
3551 * use-case, that is intended for better thermal management, and so helps
3552 * to improve performance. CLx is enabled only if both sides of the link
3553 * support CLx, and if both sides of the link are not configured as two
3554 * single lane links and only if the link is not inter-domain link. The
3555 * complete set of conditions is described in CM Guide 1.0 section 8.1.
3557 * Return: Returns 0 on success or an error code on failure.
3559 int tb_switch_enable_clx(struct tb_switch *sw, enum tb_clx clx)
3561 struct tb_switch *root_sw = sw->tb->root_switch;
3567 * CLx is not enabled and validated on Intel USB4 platforms before
3570 if (root_sw->generation < 4 || tb_switch_is_tiger_lake(root_sw))
3575 /* CL0s and CL1 are enabled and supported together */
3576 return __tb_switch_enable_clx(sw, clx);
3583 static int __tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3585 struct tb_switch *parent = tb_switch_parent(sw);
3586 struct tb_port *up, *down;
3589 if (!tb_switch_is_clx_supported(sw))
3593 * Disable CLx for host router's downstream port as part of the
3594 * downstream router enabling procedure.
3599 /* Disable CLx only for first hop router (depth = 1) */
3600 if (tb_route(parent))
3603 up = tb_upstream_port(sw);
3604 down = tb_port_at(tb_route(sw), parent);
3605 ret = tb_port_clx_disable(up, clx);
3609 ret = tb_port_clx_disable(down, clx);
3613 sw->clx = TB_CLX_DISABLE;
3615 tb_port_dbg(up, "%s disabled\n", tb_switch_clx_name(clx));
3620 * tb_switch_disable_clx() - Disable CLx on upstream port of specified router
3621 * @sw: Router to disable CLx for
3622 * @clx: The CLx state to disable
3624 * Return: Returns 0 on success or an error code on failure.
3626 int tb_switch_disable_clx(struct tb_switch *sw, enum tb_clx clx)
3633 /* CL0s and CL1 are enabled and supported together */
3634 return __tb_switch_disable_clx(sw, clx);
3642 * tb_switch_mask_clx_objections() - Mask CLx objections for a router
3643 * @sw: Router to mask objections for
3645 * Mask the objections coming from the second depth routers in order to
3646 * stop these objections from interfering with the CLx states of the first
3649 int tb_switch_mask_clx_objections(struct tb_switch *sw)
3651 int up_port = sw->config.upstream_port_number;
3652 u32 offset, val[2], mask_obj, unmask_obj;
3655 /* Only Titan Ridge of pre-USB4 devices support CLx states */
3656 if (!tb_switch_is_titan_ridge(sw))
3663 * In Titan Ridge there are only 2 dual-lane Thunderbolt ports:
3664 * Port A consists of lane adapters 1,2 and
3665 * Port B consists of lane adapters 3,4
3666 * If upstream port is A, (lanes are 1,2), we mask objections from
3667 * port B (lanes 3,4) and unmask objections from Port A and vice-versa.
3670 mask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3671 unmask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3672 offset = TB_LOW_PWR_C1_CL1;
3674 mask_obj = TB_LOW_PWR_C1_PORT_A_MASK;
3675 unmask_obj = TB_LOW_PWR_C0_PORT_B_MASK;
3676 offset = TB_LOW_PWR_C3_CL1;
3679 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH,
3680 sw->cap_lp + offset, ARRAY_SIZE(val));
3684 for (i = 0; i < ARRAY_SIZE(val); i++) {
3686 val[i] &= ~unmask_obj;
3689 return tb_sw_write(sw, &val, TB_CFG_SWITCH,
3690 sw->cap_lp + offset, ARRAY_SIZE(val));
3694 * Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
3695 * device. For now used only for Titan Ridge.
3697 static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
3698 unsigned int pcie_offset, u32 value)
3700 u32 offset, command, val;
3703 if (sw->generation != 3)
3706 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
3707 ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
3711 command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
3712 command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
3713 command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
3714 command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
3715 << TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
3716 command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
3718 offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
3720 ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
3724 ret = tb_switch_wait_for_bit(sw, offset,
3725 TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
3729 ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
3733 if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
3740 * tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
3741 * @sw: Router to enable PCIe L1
3743 * For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
3744 * entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
3745 * was configured. Due to Intel platforms limitation, shall be called only
3746 * for first hop switch.
3748 int tb_switch_pcie_l1_enable(struct tb_switch *sw)
3750 struct tb_switch *parent = tb_switch_parent(sw);
3756 if (!tb_switch_is_titan_ridge(sw))
3759 /* Enable PCIe L1 enable only for first hop router (depth = 1) */
3760 if (tb_route(parent))
3763 /* Write to downstream PCIe bridge #5 aka Dn4 */
3764 ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
3768 /* Write to Upstream PCIe bridge #0 aka Up0 */
3769 return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
3773 * tb_switch_xhci_connect() - Connect internal xHCI
3774 * @sw: Router whose xHCI to connect
3776 * Can be called to any router. For Alpine Ridge and Titan Ridge
3777 * performs special flows that bring the xHCI functional for any device
3778 * connected to the type-C port. Call only after PCIe tunnel has been
3779 * established. The function only does the connect if not done already
3780 * so can be called several times for the same router.
3782 int tb_switch_xhci_connect(struct tb_switch *sw)
3784 bool usb_port1, usb_port3, xhci_port1, xhci_port3;
3785 struct tb_port *port1, *port3;
3788 port1 = &sw->ports[1];
3789 port3 = &sw->ports[3];
3791 if (tb_switch_is_alpine_ridge(sw)) {
3792 usb_port1 = tb_lc_is_usb_plugged(port1);
3793 usb_port3 = tb_lc_is_usb_plugged(port3);
3794 xhci_port1 = tb_lc_is_xhci_connected(port1);
3795 xhci_port3 = tb_lc_is_xhci_connected(port3);
3797 /* Figure out correct USB port to connect */
3798 if (usb_port1 && !xhci_port1) {
3799 ret = tb_lc_xhci_connect(port1);
3803 if (usb_port3 && !xhci_port3)
3804 return tb_lc_xhci_connect(port3);
3805 } else if (tb_switch_is_titan_ridge(sw)) {
3806 ret = tb_lc_xhci_connect(port1);
3809 return tb_lc_xhci_connect(port3);
3816 * tb_switch_xhci_disconnect() - Disconnect internal xHCI
3817 * @sw: Router whose xHCI to disconnect
3819 * The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
3822 void tb_switch_xhci_disconnect(struct tb_switch *sw)
3824 if (sw->generation == 3) {
3825 struct tb_port *port1 = &sw->ports[1];
3826 struct tb_port *port3 = &sw->ports[3];
3828 tb_lc_xhci_disconnect(port1);
3829 tb_port_dbg(port1, "disconnected xHCI\n");
3830 tb_lc_xhci_disconnect(port3);
3831 tb_port_dbg(port3, "disconnected xHCI\n");