Upgrade to 4.4.50-rt62
[kvmfornfv.git] / kernel / drivers / usb / host / xhci-hub.c
1 /*
2  * xHCI host controller driver
3  *
4  * Copyright (C) 2008 Intel Corp.
5  *
6  * Author: Sarah Sharp
7  * Some code borrowed from the Linux EHCI driver.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16  * for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software Foundation,
20  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22
23
24 #include <linux/slab.h>
25 #include <asm/unaligned.h>
26
27 #include "xhci.h"
28 #include "xhci-trace.h"
29
30 #define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
31 #define PORT_RWC_BITS   (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
32                          PORT_RC | PORT_PLC | PORT_PE)
33
34 /* USB 3 BOS descriptor and a capability descriptors, combined.
35  * Fields will be adjusted and added later in xhci_create_usb3_bos_desc()
36  */
37 static u8 usb_bos_descriptor [] = {
38         USB_DT_BOS_SIZE,                /*  __u8 bLength, 5 bytes */
39         USB_DT_BOS,                     /*  __u8 bDescriptorType */
40         0x0F, 0x00,                     /*  __le16 wTotalLength, 15 bytes */
41         0x1,                            /*  __u8 bNumDeviceCaps */
42         /* First device capability, SuperSpeed */
43         USB_DT_USB_SS_CAP_SIZE,         /*  __u8 bLength, 10 bytes */
44         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
45         USB_SS_CAP_TYPE,                /* bDevCapabilityType, SUPERSPEED_USB */
46         0x00,                           /* bmAttributes, LTM off by default */
47         USB_5GBPS_OPERATION, 0x00,      /* wSpeedsSupported, 5Gbps only */
48         0x03,                           /* bFunctionalitySupport,
49                                            USB 3.0 speed only */
50         0x00,                           /* bU1DevExitLat, set later. */
51         0x00, 0x00,                     /* __le16 bU2DevExitLat, set later. */
52         /* Second device capability, SuperSpeedPlus */
53         0x0c,                           /* bLength 12, will be adjusted later */
54         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
55         USB_SSP_CAP_TYPE,               /* bDevCapabilityType SUPERSPEED_PLUS */
56         0x00,                           /* bReserved 0 */
57         0x00, 0x00, 0x00, 0x00,         /* bmAttributes, get from xhci psic */
58         0x00, 0x00,                     /* wFunctionalitySupport */
59         0x00, 0x00,                     /* wReserved 0 */
60         /* Sublink Speed Attributes are added in xhci_create_usb3_bos_desc() */
61 };
62
63 static int xhci_create_usb3_bos_desc(struct xhci_hcd *xhci, char *buf,
64                                      u16 wLength)
65 {
66         int i, ssa_count;
67         u32 temp;
68         u16 desc_size, ssp_cap_size, ssa_size = 0;
69         bool usb3_1 = false;
70
71         desc_size = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
72         ssp_cap_size = sizeof(usb_bos_descriptor) - desc_size;
73
74         /* does xhci support USB 3.1 Enhanced SuperSpeed */
75         if (xhci->usb3_rhub.min_rev >= 0x01 && xhci->usb3_rhub.psi_uid_count) {
76                 /* two SSA entries for each unique PSI ID, one RX and one TX */
77                 ssa_count = xhci->usb3_rhub.psi_uid_count * 2;
78                 ssa_size = ssa_count * sizeof(u32);
79                 desc_size += ssp_cap_size;
80                 usb3_1 = true;
81         }
82         memcpy(buf, &usb_bos_descriptor, min(desc_size, wLength));
83
84         if (usb3_1) {
85                 /* modify bos descriptor bNumDeviceCaps and wTotalLength */
86                 buf[4] += 1;
87                 put_unaligned_le16(desc_size + ssa_size, &buf[2]);
88         }
89
90         if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
91                 return wLength;
92
93         /* Indicate whether the host has LTM support. */
94         temp = readl(&xhci->cap_regs->hcc_params);
95         if (HCC_LTC(temp))
96                 buf[8] |= USB_LTM_SUPPORT;
97
98         /* Set the U1 and U2 exit latencies. */
99         if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
100                 temp = readl(&xhci->cap_regs->hcs_params3);
101                 buf[12] = HCS_U1_LATENCY(temp);
102                 put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]);
103         }
104
105         if (usb3_1) {
106                 u32 ssp_cap_base, bm_attrib, psi;
107                 int offset;
108
109                 ssp_cap_base = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
110
111                 if (wLength < desc_size)
112                         return wLength;
113                 buf[ssp_cap_base] = ssp_cap_size + ssa_size;
114
115                 /* attribute count SSAC bits 4:0 and ID count SSIC bits 8:5 */
116                 bm_attrib = (ssa_count - 1) & 0x1f;
117                 bm_attrib |= (xhci->usb3_rhub.psi_uid_count - 1) << 5;
118                 put_unaligned_le32(bm_attrib, &buf[ssp_cap_base + 4]);
119
120                 if (wLength < desc_size + ssa_size)
121                         return wLength;
122                 /*
123                  * Create the Sublink Speed Attributes (SSA) array.
124                  * The xhci PSI field and USB 3.1 SSA fields are very similar,
125                  * but link type bits 7:6 differ for values 01b and 10b.
126                  * xhci has also only one PSI entry for a symmetric link when
127                  * USB 3.1 requires two SSA entries (RX and TX) for every link
128                  */
129                 offset = desc_size;
130                 for (i = 0; i < xhci->usb3_rhub.psi_count; i++) {
131                         psi = xhci->usb3_rhub.psi[i];
132                         psi &= ~USB_SSP_SUBLINK_SPEED_RSVD;
133                         if ((psi & PLT_MASK) == PLT_SYM) {
134                         /* Symmetric, create SSA RX and TX from one PSI entry */
135                                 put_unaligned_le32(psi, &buf[offset]);
136                                 psi |= 1 << 7;  /* turn entry to TX */
137                                 offset += 4;
138                                 if (offset >= desc_size + ssa_size)
139                                         return desc_size + ssa_size;
140                         } else if ((psi & PLT_MASK) == PLT_ASYM_RX) {
141                                 /* Asymetric RX, flip bits 7:6 for SSA */
142                                 psi ^= PLT_MASK;
143                         }
144                         put_unaligned_le32(psi, &buf[offset]);
145                         offset += 4;
146                         if (offset >= desc_size + ssa_size)
147                                 return desc_size + ssa_size;
148                 }
149         }
150         /* ssa_size is 0 for other than usb 3.1 hosts */
151         return desc_size + ssa_size;
152 }
153
154 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
155                 struct usb_hub_descriptor *desc, int ports)
156 {
157         u16 temp;
158
159         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
160         desc->bHubContrCurrent = 0;
161
162         desc->bNbrPorts = ports;
163         temp = 0;
164         /* Bits 1:0 - support per-port power switching, or power always on */
165         if (HCC_PPC(xhci->hcc_params))
166                 temp |= HUB_CHAR_INDV_PORT_LPSM;
167         else
168                 temp |= HUB_CHAR_NO_LPSM;
169         /* Bit  2 - root hubs are not part of a compound device */
170         /* Bits 4:3 - individual port over current protection */
171         temp |= HUB_CHAR_INDV_PORT_OCPM;
172         /* Bits 6:5 - no TTs in root ports */
173         /* Bit  7 - no port indicators */
174         desc->wHubCharacteristics = cpu_to_le16(temp);
175 }
176
177 /* Fill in the USB 2.0 roothub descriptor */
178 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
179                 struct usb_hub_descriptor *desc)
180 {
181         int ports;
182         u16 temp;
183         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
184         u32 portsc;
185         unsigned int i;
186
187         ports = xhci->num_usb2_ports;
188
189         xhci_common_hub_descriptor(xhci, desc, ports);
190         desc->bDescriptorType = USB_DT_HUB;
191         temp = 1 + (ports / 8);
192         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
193
194         /* The Device Removable bits are reported on a byte granularity.
195          * If the port doesn't exist within that byte, the bit is set to 0.
196          */
197         memset(port_removable, 0, sizeof(port_removable));
198         for (i = 0; i < ports; i++) {
199                 portsc = readl(xhci->usb2_ports[i]);
200                 /* If a device is removable, PORTSC reports a 0, same as in the
201                  * hub descriptor DeviceRemovable bits.
202                  */
203                 if (portsc & PORT_DEV_REMOVE)
204                         /* This math is hairy because bit 0 of DeviceRemovable
205                          * is reserved, and bit 1 is for port 1, etc.
206                          */
207                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
208         }
209
210         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
211          * ports on it.  The USB 2.0 specification says that there are two
212          * variable length fields at the end of the hub descriptor:
213          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
214          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
215          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
216          * 0xFF, so we initialize the both arrays (DeviceRemovable and
217          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
218          * set of ports that actually exist.
219          */
220         memset(desc->u.hs.DeviceRemovable, 0xff,
221                         sizeof(desc->u.hs.DeviceRemovable));
222         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
223                         sizeof(desc->u.hs.PortPwrCtrlMask));
224
225         for (i = 0; i < (ports + 1 + 7) / 8; i++)
226                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
227                                 sizeof(__u8));
228 }
229
230 /* Fill in the USB 3.0 roothub descriptor */
231 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
232                 struct usb_hub_descriptor *desc)
233 {
234         int ports;
235         u16 port_removable;
236         u32 portsc;
237         unsigned int i;
238
239         ports = xhci->num_usb3_ports;
240         xhci_common_hub_descriptor(xhci, desc, ports);
241         desc->bDescriptorType = USB_DT_SS_HUB;
242         desc->bDescLength = USB_DT_SS_HUB_SIZE;
243
244         /* header decode latency should be zero for roothubs,
245          * see section 4.23.5.2.
246          */
247         desc->u.ss.bHubHdrDecLat = 0;
248         desc->u.ss.wHubDelay = 0;
249
250         port_removable = 0;
251         /* bit 0 is reserved, bit 1 is for port 1, etc. */
252         for (i = 0; i < ports; i++) {
253                 portsc = readl(xhci->usb3_ports[i]);
254                 if (portsc & PORT_DEV_REMOVE)
255                         port_removable |= 1 << (i + 1);
256         }
257
258         desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
259 }
260
261 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
262                 struct usb_hub_descriptor *desc)
263 {
264
265         if (hcd->speed >= HCD_USB3)
266                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
267         else
268                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
269
270 }
271
272 static unsigned int xhci_port_speed(unsigned int port_status)
273 {
274         if (DEV_LOWSPEED(port_status))
275                 return USB_PORT_STAT_LOW_SPEED;
276         if (DEV_HIGHSPEED(port_status))
277                 return USB_PORT_STAT_HIGH_SPEED;
278         /*
279          * FIXME: Yes, we should check for full speed, but the core uses that as
280          * a default in portspeed() in usb/core/hub.c (which is the only place
281          * USB_PORT_STAT_*_SPEED is used).
282          */
283         return 0;
284 }
285
286 /*
287  * These bits are Read Only (RO) and should be saved and written to the
288  * registers: 0, 3, 10:13, 30
289  * connect status, over-current status, port speed, and device removable.
290  * connect status and port speed are also sticky - meaning they're in
291  * the AUX well and they aren't changed by a hot, warm, or cold reset.
292  */
293 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
294 /*
295  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
296  * bits 5:8, 9, 14:15, 25:27
297  * link state, port power, port indicator state, "wake on" enable state
298  */
299 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
300 /*
301  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
302  * bit 4 (port reset)
303  */
304 #define XHCI_PORT_RW1S  ((1<<4))
305 /*
306  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
307  * bits 1, 17, 18, 19, 20, 21, 22, 23
308  * port enable/disable, and
309  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
310  * over-current, reset, link state, and L1 change
311  */
312 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
313 /*
314  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
315  * latched in
316  */
317 #define XHCI_PORT_RW    ((1<<16))
318 /*
319  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
320  * bits 2, 24, 28:31
321  */
322 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
323
324 /*
325  * Given a port state, this function returns a value that would result in the
326  * port being in the same state, if the value was written to the port status
327  * control register.
328  * Save Read Only (RO) bits and save read/write bits where
329  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
330  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
331  */
332 u32 xhci_port_state_to_neutral(u32 state)
333 {
334         /* Save read-only status and port state */
335         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
336 }
337
338 /*
339  * find slot id based on port number.
340  * @port: The one-based port number from one of the two split roothubs.
341  */
342 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
343                 u16 port)
344 {
345         int slot_id;
346         int i;
347         enum usb_device_speed speed;
348
349         slot_id = 0;
350         for (i = 0; i < MAX_HC_SLOTS; i++) {
351                 if (!xhci->devs[i])
352                         continue;
353                 speed = xhci->devs[i]->udev->speed;
354                 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
355                                 && xhci->devs[i]->fake_port == port) {
356                         slot_id = i;
357                         break;
358                 }
359         }
360
361         return slot_id;
362 }
363
364 /*
365  * Stop device
366  * It issues stop endpoint command for EP 0 to 30. And wait the last command
367  * to complete.
368  * suspend will set to 1, if suspend bit need to set in command.
369  */
370 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
371 {
372         struct xhci_virt_device *virt_dev;
373         struct xhci_command *cmd;
374         unsigned long flags;
375         int ret;
376         int i;
377
378         ret = 0;
379         virt_dev = xhci->devs[slot_id];
380         if (!virt_dev)
381                 return -ENODEV;
382
383         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
384         if (!cmd) {
385                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
386                 return -ENOMEM;
387         }
388
389         spin_lock_irqsave(&xhci->lock, flags);
390         for (i = LAST_EP_INDEX; i > 0; i--) {
391                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
392                         struct xhci_command *command;
393                         command = xhci_alloc_command(xhci, false, false,
394                                                      GFP_NOWAIT);
395                         if (!command) {
396                                 spin_unlock_irqrestore(&xhci->lock, flags);
397                                 xhci_free_command(xhci, cmd);
398                                 return -ENOMEM;
399
400                         }
401                         xhci_queue_stop_endpoint(xhci, command, slot_id, i,
402                                                  suspend);
403                 }
404         }
405         xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
406         xhci_ring_cmd_db(xhci);
407         spin_unlock_irqrestore(&xhci->lock, flags);
408
409         /* Wait for last stop endpoint command to finish */
410         wait_for_completion(cmd->completion);
411
412         if (cmd->status == COMP_CMD_ABORT || cmd->status == COMP_CMD_STOP) {
413                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
414                 ret = -ETIME;
415         }
416         xhci_free_command(xhci, cmd);
417         return ret;
418 }
419
420 /*
421  * Ring device, it rings the all doorbells unconditionally.
422  */
423 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
424 {
425         int i, s;
426         struct xhci_virt_ep *ep;
427
428         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
429                 ep = &xhci->devs[slot_id]->eps[i];
430
431                 if (ep->ep_state & EP_HAS_STREAMS) {
432                         for (s = 1; s < ep->stream_info->num_streams; s++)
433                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
434                 } else if (ep->ring && ep->ring->dequeue) {
435                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
436                 }
437         }
438
439         return;
440 }
441
442 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
443                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
444 {
445         /* Don't allow the USB core to disable SuperSpeed ports. */
446         if (hcd->speed >= HCD_USB3) {
447                 xhci_dbg(xhci, "Ignoring request to disable "
448                                 "SuperSpeed port.\n");
449                 return;
450         }
451
452         /* Write 1 to disable the port */
453         writel(port_status | PORT_PE, addr);
454         port_status = readl(addr);
455         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
456                         wIndex, port_status);
457 }
458
459 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
460                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
461 {
462         char *port_change_bit;
463         u32 status;
464
465         switch (wValue) {
466         case USB_PORT_FEAT_C_RESET:
467                 status = PORT_RC;
468                 port_change_bit = "reset";
469                 break;
470         case USB_PORT_FEAT_C_BH_PORT_RESET:
471                 status = PORT_WRC;
472                 port_change_bit = "warm(BH) reset";
473                 break;
474         case USB_PORT_FEAT_C_CONNECTION:
475                 status = PORT_CSC;
476                 port_change_bit = "connect";
477                 break;
478         case USB_PORT_FEAT_C_OVER_CURRENT:
479                 status = PORT_OCC;
480                 port_change_bit = "over-current";
481                 break;
482         case USB_PORT_FEAT_C_ENABLE:
483                 status = PORT_PEC;
484                 port_change_bit = "enable/disable";
485                 break;
486         case USB_PORT_FEAT_C_SUSPEND:
487                 status = PORT_PLC;
488                 port_change_bit = "suspend/resume";
489                 break;
490         case USB_PORT_FEAT_C_PORT_LINK_STATE:
491                 status = PORT_PLC;
492                 port_change_bit = "link state";
493                 break;
494         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
495                 status = PORT_CEC;
496                 port_change_bit = "config error";
497                 break;
498         default:
499                 /* Should never happen */
500                 return;
501         }
502         /* Change bits are all write 1 to clear */
503         writel(port_status | status, addr);
504         port_status = readl(addr);
505         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
506                         port_change_bit, wIndex, port_status);
507 }
508
509 static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
510 {
511         int max_ports;
512         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
513
514         if (hcd->speed >= HCD_USB3) {
515                 max_ports = xhci->num_usb3_ports;
516                 *port_array = xhci->usb3_ports;
517         } else {
518                 max_ports = xhci->num_usb2_ports;
519                 *port_array = xhci->usb2_ports;
520         }
521
522         return max_ports;
523 }
524
525 void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
526                                 int port_id, u32 link_state)
527 {
528         u32 temp;
529
530         temp = readl(port_array[port_id]);
531         temp = xhci_port_state_to_neutral(temp);
532         temp &= ~PORT_PLS_MASK;
533         temp |= PORT_LINK_STROBE | link_state;
534         writel(temp, port_array[port_id]);
535 }
536
537 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
538                 __le32 __iomem **port_array, int port_id, u16 wake_mask)
539 {
540         u32 temp;
541
542         temp = readl(port_array[port_id]);
543         temp = xhci_port_state_to_neutral(temp);
544
545         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
546                 temp |= PORT_WKCONN_E;
547         else
548                 temp &= ~PORT_WKCONN_E;
549
550         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
551                 temp |= PORT_WKDISC_E;
552         else
553                 temp &= ~PORT_WKDISC_E;
554
555         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
556                 temp |= PORT_WKOC_E;
557         else
558                 temp &= ~PORT_WKOC_E;
559
560         writel(temp, port_array[port_id]);
561 }
562
563 /* Test and clear port RWC bit */
564 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
565                                 int port_id, u32 port_bit)
566 {
567         u32 temp;
568
569         temp = readl(port_array[port_id]);
570         if (temp & port_bit) {
571                 temp = xhci_port_state_to_neutral(temp);
572                 temp |= port_bit;
573                 writel(temp, port_array[port_id]);
574         }
575 }
576
577 /* Updates Link Status for USB 2.1 port */
578 static void xhci_hub_report_usb2_link_state(u32 *status, u32 status_reg)
579 {
580         if ((status_reg & PORT_PLS_MASK) == XDEV_U2)
581                 *status |= USB_PORT_STAT_L1;
582 }
583
584 /* Updates Link Status for super Speed port */
585 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
586                 u32 *status, u32 status_reg)
587 {
588         u32 pls = status_reg & PORT_PLS_MASK;
589
590         /* resume state is a xHCI internal state.
591          * Do not report it to usb core, instead, pretend to be U3,
592          * thus usb core knows it's not ready for transfer
593          */
594         if (pls == XDEV_RESUME) {
595                 *status |= USB_SS_PORT_LS_U3;
596                 return;
597         }
598
599         /* When the CAS bit is set then warm reset
600          * should be performed on port
601          */
602         if (status_reg & PORT_CAS) {
603                 /* The CAS bit can be set while the port is
604                  * in any link state.
605                  * Only roothubs have CAS bit, so we
606                  * pretend to be in compliance mode
607                  * unless we're already in compliance
608                  * or the inactive state.
609                  */
610                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
611                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
612                         pls = USB_SS_PORT_LS_COMP_MOD;
613                 }
614                 /* Return also connection bit -
615                  * hub state machine resets port
616                  * when this bit is set.
617                  */
618                 pls |= USB_PORT_STAT_CONNECTION;
619         } else {
620                 /*
621                  * If CAS bit isn't set but the Port is already at
622                  * Compliance Mode, fake a connection so the USB core
623                  * notices the Compliance state and resets the port.
624                  * This resolves an issue generated by the SN65LVPE502CP
625                  * in which sometimes the port enters compliance mode
626                  * caused by a delay on the host-device negotiation.
627                  */
628                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
629                                 (pls == USB_SS_PORT_LS_COMP_MOD))
630                         pls |= USB_PORT_STAT_CONNECTION;
631         }
632
633         /* update status field */
634         *status |= pls;
635 }
636
637 /*
638  * Function for Compliance Mode Quirk.
639  *
640  * This Function verifies if all xhc USB3 ports have entered U0, if so,
641  * the compliance mode timer is deleted. A port won't enter
642  * compliance mode if it has previously entered U0.
643  */
644 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
645                                     u16 wIndex)
646 {
647         u32 all_ports_seen_u0 = ((1 << xhci->num_usb3_ports)-1);
648         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
649
650         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
651                 return;
652
653         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
654                 xhci->port_status_u0 |= 1 << wIndex;
655                 if (xhci->port_status_u0 == all_ports_seen_u0) {
656                         del_timer_sync(&xhci->comp_mode_recovery_timer);
657                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
658                                 "All USB3 ports have entered U0 already!");
659                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
660                                 "Compliance Mode Recovery Timer Deleted.");
661                 }
662         }
663 }
664
665 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
666 {
667         u32 ext_stat = 0;
668         int speed_id;
669
670         /* only support rx and tx lane counts of 1 in usb3.1 spec */
671         speed_id = DEV_PORT_SPEED(raw_port_status);
672         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
673         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
674
675         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
676         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
677
678         return ext_stat;
679 }
680
681 /*
682  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
683  * 3.0 hubs use.
684  *
685  * Possible side effects:
686  *  - Mark a port as being done with device resume,
687  *    and ring the endpoint doorbells.
688  *  - Stop the Synopsys redriver Compliance Mode polling.
689  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
690  */
691 static u32 xhci_get_port_status(struct usb_hcd *hcd,
692                 struct xhci_bus_state *bus_state,
693                 __le32 __iomem **port_array,
694                 u16 wIndex, u32 raw_port_status,
695                 unsigned long flags)
696         __releases(&xhci->lock)
697         __acquires(&xhci->lock)
698 {
699         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
700         u32 status = 0;
701         int slot_id;
702
703         /* wPortChange bits */
704         if (raw_port_status & PORT_CSC)
705                 status |= USB_PORT_STAT_C_CONNECTION << 16;
706         if (raw_port_status & PORT_PEC)
707                 status |= USB_PORT_STAT_C_ENABLE << 16;
708         if ((raw_port_status & PORT_OCC))
709                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
710         if ((raw_port_status & PORT_RC))
711                 status |= USB_PORT_STAT_C_RESET << 16;
712         /* USB3.0 only */
713         if (hcd->speed >= HCD_USB3) {
714                 /* Port link change with port in resume state should not be
715                  * reported to usbcore, as this is an internal state to be
716                  * handled by xhci driver. Reporting PLC to usbcore may
717                  * cause usbcore clearing PLC first and port change event
718                  * irq won't be generated.
719                  */
720                 if ((raw_port_status & PORT_PLC) &&
721                         (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME)
722                         status |= USB_PORT_STAT_C_LINK_STATE << 16;
723                 if ((raw_port_status & PORT_WRC))
724                         status |= USB_PORT_STAT_C_BH_RESET << 16;
725                 if ((raw_port_status & PORT_CEC))
726                         status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
727         }
728
729         if (hcd->speed < HCD_USB3) {
730                 if ((raw_port_status & PORT_PLS_MASK) == XDEV_U3
731                                 && (raw_port_status & PORT_POWER))
732                         status |= USB_PORT_STAT_SUSPEND;
733         }
734         if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
735                 !DEV_SUPERSPEED_ANY(raw_port_status)) {
736                 if ((raw_port_status & PORT_RESET) ||
737                                 !(raw_port_status & PORT_PE))
738                         return 0xffffffff;
739                 /* did port event handler already start resume timing? */
740                 if (!bus_state->resume_done[wIndex]) {
741                         /* If not, maybe we are in a host initated resume? */
742                         if (test_bit(wIndex, &bus_state->resuming_ports)) {
743                                 /* Host initated resume doesn't time the resume
744                                  * signalling using resume_done[].
745                                  * It manually sets RESUME state, sleeps 20ms
746                                  * and sets U0 state. This should probably be
747                                  * changed, but not right now.
748                                  */
749                         } else {
750                                 /* port resume was discovered now and here,
751                                  * start resume timing
752                                  */
753                                 unsigned long timeout = jiffies +
754                                         msecs_to_jiffies(USB_RESUME_TIMEOUT);
755
756                                 set_bit(wIndex, &bus_state->resuming_ports);
757                                 bus_state->resume_done[wIndex] = timeout;
758                                 mod_timer(&hcd->rh_timer, timeout);
759                         }
760                 /* Has resume been signalled for USB_RESUME_TIME yet? */
761                 } else if (time_after_eq(jiffies,
762                                          bus_state->resume_done[wIndex])) {
763                         int time_left;
764
765                         xhci_dbg(xhci, "Resume USB2 port %d\n",
766                                         wIndex + 1);
767                         bus_state->resume_done[wIndex] = 0;
768                         clear_bit(wIndex, &bus_state->resuming_ports);
769
770                         set_bit(wIndex, &bus_state->rexit_ports);
771                         xhci_set_link_state(xhci, port_array, wIndex,
772                                         XDEV_U0);
773
774                         spin_unlock_irqrestore(&xhci->lock, flags);
775                         time_left = wait_for_completion_timeout(
776                                         &bus_state->rexit_done[wIndex],
777                                         msecs_to_jiffies(
778                                                 XHCI_MAX_REXIT_TIMEOUT));
779                         spin_lock_irqsave(&xhci->lock, flags);
780
781                         if (time_left) {
782                                 slot_id = xhci_find_slot_id_by_port(hcd,
783                                                 xhci, wIndex + 1);
784                                 if (!slot_id) {
785                                         xhci_dbg(xhci, "slot_id is zero\n");
786                                         return 0xffffffff;
787                                 }
788                                 xhci_ring_device(xhci, slot_id);
789                         } else {
790                                 int port_status = readl(port_array[wIndex]);
791                                 xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n",
792                                                 XHCI_MAX_REXIT_TIMEOUT,
793                                                 port_status);
794                                 status |= USB_PORT_STAT_SUSPEND;
795                                 clear_bit(wIndex, &bus_state->rexit_ports);
796                         }
797
798                         bus_state->port_c_suspend |= 1 << wIndex;
799                         bus_state->suspended_ports &= ~(1 << wIndex);
800                 } else {
801                         /*
802                          * The resume has been signaling for less than
803                          * USB_RESUME_TIME. Report the port status as SUSPEND,
804                          * let the usbcore check port status again and clear
805                          * resume signaling later.
806                          */
807                         status |= USB_PORT_STAT_SUSPEND;
808                 }
809         }
810         /*
811          * Clear stale usb2 resume signalling variables in case port changed
812          * state during resume signalling. For example on error
813          */
814         if ((bus_state->resume_done[wIndex] ||
815              test_bit(wIndex, &bus_state->resuming_ports)) &&
816             (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
817             (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
818                 bus_state->resume_done[wIndex] = 0;
819                 clear_bit(wIndex, &bus_state->resuming_ports);
820         }
821
822
823         if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 &&
824             (raw_port_status & PORT_POWER)) {
825                 if (bus_state->suspended_ports & (1 << wIndex)) {
826                         bus_state->suspended_ports &= ~(1 << wIndex);
827                         if (hcd->speed < HCD_USB3)
828                                 bus_state->port_c_suspend |= 1 << wIndex;
829                 }
830                 bus_state->resume_done[wIndex] = 0;
831                 clear_bit(wIndex, &bus_state->resuming_ports);
832         }
833         if (raw_port_status & PORT_CONNECT) {
834                 status |= USB_PORT_STAT_CONNECTION;
835                 status |= xhci_port_speed(raw_port_status);
836         }
837         if (raw_port_status & PORT_PE)
838                 status |= USB_PORT_STAT_ENABLE;
839         if (raw_port_status & PORT_OC)
840                 status |= USB_PORT_STAT_OVERCURRENT;
841         if (raw_port_status & PORT_RESET)
842                 status |= USB_PORT_STAT_RESET;
843         if (raw_port_status & PORT_POWER) {
844                 if (hcd->speed >= HCD_USB3)
845                         status |= USB_SS_PORT_STAT_POWER;
846                 else
847                         status |= USB_PORT_STAT_POWER;
848         }
849         /* Update Port Link State */
850         if (hcd->speed >= HCD_USB3) {
851                 xhci_hub_report_usb3_link_state(xhci, &status, raw_port_status);
852                 /*
853                  * Verify if all USB3 Ports Have entered U0 already.
854                  * Delete Compliance Mode Timer if so.
855                  */
856                 xhci_del_comp_mod_timer(xhci, raw_port_status, wIndex);
857         } else {
858                 xhci_hub_report_usb2_link_state(&status, raw_port_status);
859         }
860         if (bus_state->port_c_suspend & (1 << wIndex))
861                 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
862
863         return status;
864 }
865
866 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
867                 u16 wIndex, char *buf, u16 wLength)
868 {
869         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
870         int max_ports;
871         unsigned long flags;
872         u32 temp, status;
873         int retval = 0;
874         __le32 __iomem **port_array;
875         int slot_id;
876         struct xhci_bus_state *bus_state;
877         u16 link_state = 0;
878         u16 wake_mask = 0;
879         u16 timeout = 0;
880
881         max_ports = xhci_get_ports(hcd, &port_array);
882         bus_state = &xhci->bus_state[hcd_index(hcd)];
883
884         spin_lock_irqsave(&xhci->lock, flags);
885         switch (typeReq) {
886         case GetHubStatus:
887                 /* No power source, over-current reported per port */
888                 memset(buf, 0, 4);
889                 break;
890         case GetHubDescriptor:
891                 /* Check to make sure userspace is asking for the USB 3.0 hub
892                  * descriptor for the USB 3.0 roothub.  If not, we stall the
893                  * endpoint, like external hubs do.
894                  */
895                 if (hcd->speed >= HCD_USB3 &&
896                                 (wLength < USB_DT_SS_HUB_SIZE ||
897                                  wValue != (USB_DT_SS_HUB << 8))) {
898                         xhci_dbg(xhci, "Wrong hub descriptor type for "
899                                         "USB 3.0 roothub.\n");
900                         goto error;
901                 }
902                 xhci_hub_descriptor(hcd, xhci,
903                                 (struct usb_hub_descriptor *) buf);
904                 break;
905         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
906                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
907                         goto error;
908
909                 if (hcd->speed < HCD_USB3)
910                         goto error;
911
912                 retval = xhci_create_usb3_bos_desc(xhci, buf, wLength);
913                 spin_unlock_irqrestore(&xhci->lock, flags);
914                 return retval;
915         case GetPortStatus:
916                 if (!wIndex || wIndex > max_ports)
917                         goto error;
918                 wIndex--;
919                 temp = readl(port_array[wIndex]);
920                 if (temp == 0xffffffff) {
921                         retval = -ENODEV;
922                         break;
923                 }
924                 status = xhci_get_port_status(hcd, bus_state, port_array,
925                                 wIndex, temp, flags);
926                 if (status == 0xffffffff)
927                         goto error;
928
929                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n",
930                                 wIndex, temp);
931                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
932
933                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
934                 /* if USB 3.1 extended port status return additional 4 bytes */
935                 if (wValue == 0x02) {
936                         u32 port_li;
937
938                         if (hcd->speed < HCD_USB31 || wLength != 8) {
939                                 xhci_err(xhci, "get ext port status invalid parameter\n");
940                                 retval = -EINVAL;
941                                 break;
942                         }
943                         port_li = readl(port_array[wIndex] + PORTLI);
944                         status = xhci_get_ext_port_status(temp, port_li);
945                         put_unaligned_le32(cpu_to_le32(status), &buf[4]);
946                 }
947                 break;
948         case SetPortFeature:
949                 if (wValue == USB_PORT_FEAT_LINK_STATE)
950                         link_state = (wIndex & 0xff00) >> 3;
951                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
952                         wake_mask = wIndex & 0xff00;
953                 /* The MSB of wIndex is the U1/U2 timeout */
954                 timeout = (wIndex & 0xff00) >> 8;
955                 wIndex &= 0xff;
956                 if (!wIndex || wIndex > max_ports)
957                         goto error;
958                 wIndex--;
959                 temp = readl(port_array[wIndex]);
960                 if (temp == 0xffffffff) {
961                         retval = -ENODEV;
962                         break;
963                 }
964                 temp = xhci_port_state_to_neutral(temp);
965                 /* FIXME: What new port features do we need to support? */
966                 switch (wValue) {
967                 case USB_PORT_FEAT_SUSPEND:
968                         temp = readl(port_array[wIndex]);
969                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
970                                 /* Resume the port to U0 first */
971                                 xhci_set_link_state(xhci, port_array, wIndex,
972                                                         XDEV_U0);
973                                 spin_unlock_irqrestore(&xhci->lock, flags);
974                                 msleep(10);
975                                 spin_lock_irqsave(&xhci->lock, flags);
976                         }
977                         /* In spec software should not attempt to suspend
978                          * a port unless the port reports that it is in the
979                          * enabled (PED = â€˜1’,PLS < â€˜3’) state.
980                          */
981                         temp = readl(port_array[wIndex]);
982                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
983                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
984                                 xhci_warn(xhci, "USB core suspending device "
985                                           "not in U0/U1/U2.\n");
986                                 goto error;
987                         }
988
989                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
990                                         wIndex + 1);
991                         if (!slot_id) {
992                                 xhci_warn(xhci, "slot_id is zero\n");
993                                 goto error;
994                         }
995                         /* unlock to execute stop endpoint commands */
996                         spin_unlock_irqrestore(&xhci->lock, flags);
997                         xhci_stop_device(xhci, slot_id, 1);
998                         spin_lock_irqsave(&xhci->lock, flags);
999
1000                         xhci_set_link_state(xhci, port_array, wIndex, XDEV_U3);
1001
1002                         spin_unlock_irqrestore(&xhci->lock, flags);
1003                         msleep(10); /* wait device to enter */
1004                         spin_lock_irqsave(&xhci->lock, flags);
1005
1006                         temp = readl(port_array[wIndex]);
1007                         bus_state->suspended_ports |= 1 << wIndex;
1008                         break;
1009                 case USB_PORT_FEAT_LINK_STATE:
1010                         temp = readl(port_array[wIndex]);
1011
1012                         /* Disable port */
1013                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1014                                 xhci_dbg(xhci, "Disable port %d\n", wIndex);
1015                                 temp = xhci_port_state_to_neutral(temp);
1016                                 /*
1017                                  * Clear all change bits, so that we get a new
1018                                  * connection event.
1019                                  */
1020                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1021                                         PORT_OCC | PORT_RC | PORT_PLC |
1022                                         PORT_CEC;
1023                                 writel(temp | PORT_PE, port_array[wIndex]);
1024                                 temp = readl(port_array[wIndex]);
1025                                 break;
1026                         }
1027
1028                         /* Put link in RxDetect (enable port) */
1029                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1030                                 xhci_dbg(xhci, "Enable port %d\n", wIndex);
1031                                 xhci_set_link_state(xhci, port_array, wIndex,
1032                                                 link_state);
1033                                 temp = readl(port_array[wIndex]);
1034                                 break;
1035                         }
1036
1037                         /* Software should not attempt to set
1038                          * port link state above '3' (U3) and the port
1039                          * must be enabled.
1040                          */
1041                         if ((temp & PORT_PE) == 0 ||
1042                                 (link_state > USB_SS_PORT_LS_U3)) {
1043                                 xhci_warn(xhci, "Cannot set link state.\n");
1044                                 goto error;
1045                         }
1046
1047                         if (link_state == USB_SS_PORT_LS_U3) {
1048                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1049                                                 wIndex + 1);
1050                                 if (slot_id) {
1051                                         /* unlock to execute stop endpoint
1052                                          * commands */
1053                                         spin_unlock_irqrestore(&xhci->lock,
1054                                                                 flags);
1055                                         xhci_stop_device(xhci, slot_id, 1);
1056                                         spin_lock_irqsave(&xhci->lock, flags);
1057                                 }
1058                         }
1059
1060                         xhci_set_link_state(xhci, port_array, wIndex,
1061                                                 link_state);
1062
1063                         spin_unlock_irqrestore(&xhci->lock, flags);
1064                         msleep(20); /* wait device to enter */
1065                         spin_lock_irqsave(&xhci->lock, flags);
1066
1067                         temp = readl(port_array[wIndex]);
1068                         if (link_state == USB_SS_PORT_LS_U3)
1069                                 bus_state->suspended_ports |= 1 << wIndex;
1070                         break;
1071                 case USB_PORT_FEAT_POWER:
1072                         /*
1073                          * Turn on ports, even if there isn't per-port switching.
1074                          * HC will report connect events even before this is set.
1075                          * However, hub_wq will ignore the roothub events until
1076                          * the roothub is registered.
1077                          */
1078                         writel(temp | PORT_POWER, port_array[wIndex]);
1079
1080                         temp = readl(port_array[wIndex]);
1081                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
1082
1083                         spin_unlock_irqrestore(&xhci->lock, flags);
1084                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1085                                         wIndex);
1086                         if (temp)
1087                                 usb_acpi_set_power_state(hcd->self.root_hub,
1088                                                 wIndex, true);
1089                         spin_lock_irqsave(&xhci->lock, flags);
1090                         break;
1091                 case USB_PORT_FEAT_RESET:
1092                         temp = (temp | PORT_RESET);
1093                         writel(temp, port_array[wIndex]);
1094
1095                         temp = readl(port_array[wIndex]);
1096                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
1097                         break;
1098                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1099                         xhci_set_remote_wake_mask(xhci, port_array,
1100                                         wIndex, wake_mask);
1101                         temp = readl(port_array[wIndex]);
1102                         xhci_dbg(xhci, "set port remote wake mask, "
1103                                         "actual port %d status  = 0x%x\n",
1104                                         wIndex, temp);
1105                         break;
1106                 case USB_PORT_FEAT_BH_PORT_RESET:
1107                         temp |= PORT_WR;
1108                         writel(temp, port_array[wIndex]);
1109
1110                         temp = readl(port_array[wIndex]);
1111                         break;
1112                 case USB_PORT_FEAT_U1_TIMEOUT:
1113                         if (hcd->speed < HCD_USB3)
1114                                 goto error;
1115                         temp = readl(port_array[wIndex] + PORTPMSC);
1116                         temp &= ~PORT_U1_TIMEOUT_MASK;
1117                         temp |= PORT_U1_TIMEOUT(timeout);
1118                         writel(temp, port_array[wIndex] + PORTPMSC);
1119                         break;
1120                 case USB_PORT_FEAT_U2_TIMEOUT:
1121                         if (hcd->speed < HCD_USB3)
1122                                 goto error;
1123                         temp = readl(port_array[wIndex] + PORTPMSC);
1124                         temp &= ~PORT_U2_TIMEOUT_MASK;
1125                         temp |= PORT_U2_TIMEOUT(timeout);
1126                         writel(temp, port_array[wIndex] + PORTPMSC);
1127                         break;
1128                 default:
1129                         goto error;
1130                 }
1131                 /* unblock any posted writes */
1132                 temp = readl(port_array[wIndex]);
1133                 break;
1134         case ClearPortFeature:
1135                 if (!wIndex || wIndex > max_ports)
1136                         goto error;
1137                 wIndex--;
1138                 temp = readl(port_array[wIndex]);
1139                 if (temp == 0xffffffff) {
1140                         retval = -ENODEV;
1141                         break;
1142                 }
1143                 /* FIXME: What new port features do we need to support? */
1144                 temp = xhci_port_state_to_neutral(temp);
1145                 switch (wValue) {
1146                 case USB_PORT_FEAT_SUSPEND:
1147                         temp = readl(port_array[wIndex]);
1148                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1149                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1150                         if (temp & PORT_RESET)
1151                                 goto error;
1152                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1153                                 if ((temp & PORT_PE) == 0)
1154                                         goto error;
1155
1156                                 set_bit(wIndex, &bus_state->resuming_ports);
1157                                 xhci_set_link_state(xhci, port_array, wIndex,
1158                                                         XDEV_RESUME);
1159                                 spin_unlock_irqrestore(&xhci->lock, flags);
1160                                 msleep(USB_RESUME_TIMEOUT);
1161                                 spin_lock_irqsave(&xhci->lock, flags);
1162                                 xhci_set_link_state(xhci, port_array, wIndex,
1163                                                         XDEV_U0);
1164                                 clear_bit(wIndex, &bus_state->resuming_ports);
1165                         }
1166                         bus_state->port_c_suspend |= 1 << wIndex;
1167
1168                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1169                                         wIndex + 1);
1170                         if (!slot_id) {
1171                                 xhci_dbg(xhci, "slot_id is zero\n");
1172                                 goto error;
1173                         }
1174                         xhci_ring_device(xhci, slot_id);
1175                         break;
1176                 case USB_PORT_FEAT_C_SUSPEND:
1177                         bus_state->port_c_suspend &= ~(1 << wIndex);
1178                 case USB_PORT_FEAT_C_RESET:
1179                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1180                 case USB_PORT_FEAT_C_CONNECTION:
1181                 case USB_PORT_FEAT_C_OVER_CURRENT:
1182                 case USB_PORT_FEAT_C_ENABLE:
1183                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1184                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1185                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1186                                         port_array[wIndex], temp);
1187                         break;
1188                 case USB_PORT_FEAT_ENABLE:
1189                         xhci_disable_port(hcd, xhci, wIndex,
1190                                         port_array[wIndex], temp);
1191                         break;
1192                 case USB_PORT_FEAT_POWER:
1193                         writel(temp & ~PORT_POWER, port_array[wIndex]);
1194
1195                         spin_unlock_irqrestore(&xhci->lock, flags);
1196                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1197                                         wIndex);
1198                         if (temp)
1199                                 usb_acpi_set_power_state(hcd->self.root_hub,
1200                                                 wIndex, false);
1201                         spin_lock_irqsave(&xhci->lock, flags);
1202                         break;
1203                 default:
1204                         goto error;
1205                 }
1206                 break;
1207         default:
1208 error:
1209                 /* "stall" on error */
1210                 retval = -EPIPE;
1211         }
1212         spin_unlock_irqrestore(&xhci->lock, flags);
1213         return retval;
1214 }
1215
1216 /*
1217  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1218  * Ports are 0-indexed from the HCD point of view,
1219  * and 1-indexed from the USB core pointer of view.
1220  *
1221  * Note that the status change bits will be cleared as soon as a port status
1222  * change event is generated, so we use the saved status from that event.
1223  */
1224 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1225 {
1226         unsigned long flags;
1227         u32 temp, status;
1228         u32 mask;
1229         int i, retval;
1230         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1231         int max_ports;
1232         __le32 __iomem **port_array;
1233         struct xhci_bus_state *bus_state;
1234         bool reset_change = false;
1235
1236         max_ports = xhci_get_ports(hcd, &port_array);
1237         bus_state = &xhci->bus_state[hcd_index(hcd)];
1238
1239         /* Initial status is no changes */
1240         retval = (max_ports + 8) / 8;
1241         memset(buf, 0, retval);
1242
1243         /*
1244          * Inform the usbcore about resume-in-progress by returning
1245          * a non-zero value even if there are no status changes.
1246          */
1247         status = bus_state->resuming_ports;
1248
1249         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1250
1251         spin_lock_irqsave(&xhci->lock, flags);
1252         /* For each port, did anything change?  If so, set that bit in buf. */
1253         for (i = 0; i < max_ports; i++) {
1254                 temp = readl(port_array[i]);
1255                 if (temp == 0xffffffff) {
1256                         retval = -ENODEV;
1257                         break;
1258                 }
1259                 if ((temp & mask) != 0 ||
1260                         (bus_state->port_c_suspend & 1 << i) ||
1261                         (bus_state->resume_done[i] && time_after_eq(
1262                             jiffies, bus_state->resume_done[i]))) {
1263                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1264                         status = 1;
1265                 }
1266                 if ((temp & PORT_RC))
1267                         reset_change = true;
1268         }
1269         if (!status && !reset_change) {
1270                 xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
1271                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1272         }
1273         spin_unlock_irqrestore(&xhci->lock, flags);
1274         return status ? retval : 0;
1275 }
1276
1277 #ifdef CONFIG_PM
1278
1279 int xhci_bus_suspend(struct usb_hcd *hcd)
1280 {
1281         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1282         int max_ports, port_index;
1283         __le32 __iomem **port_array;
1284         struct xhci_bus_state *bus_state;
1285         unsigned long flags;
1286
1287         max_ports = xhci_get_ports(hcd, &port_array);
1288         bus_state = &xhci->bus_state[hcd_index(hcd)];
1289
1290         spin_lock_irqsave(&xhci->lock, flags);
1291
1292         if (hcd->self.root_hub->do_remote_wakeup) {
1293                 if (bus_state->resuming_ports ||        /* USB2 */
1294                     bus_state->port_remote_wakeup) {    /* USB3 */
1295                         spin_unlock_irqrestore(&xhci->lock, flags);
1296                         xhci_dbg(xhci, "suspend failed because a port is resuming\n");
1297                         return -EBUSY;
1298                 }
1299         }
1300
1301         port_index = max_ports;
1302         bus_state->bus_suspended = 0;
1303         while (port_index--) {
1304                 /* suspend the port if the port is not suspended */
1305                 u32 t1, t2;
1306                 int slot_id;
1307
1308                 t1 = readl(port_array[port_index]);
1309                 t2 = xhci_port_state_to_neutral(t1);
1310
1311                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
1312                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
1313                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1314                                         port_index + 1);
1315                         if (slot_id) {
1316                                 spin_unlock_irqrestore(&xhci->lock, flags);
1317                                 xhci_stop_device(xhci, slot_id, 1);
1318                                 spin_lock_irqsave(&xhci->lock, flags);
1319                         }
1320                         t2 &= ~PORT_PLS_MASK;
1321                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1322                         set_bit(port_index, &bus_state->bus_suspended);
1323                 }
1324                 /* USB core sets remote wake mask for USB 3.0 hubs,
1325                  * including the USB 3.0 roothub, but only if CONFIG_PM
1326                  * is enabled, so also enable remote wake here.
1327                  */
1328                 if (hcd->self.root_hub->do_remote_wakeup) {
1329                         if (t1 & PORT_CONNECT) {
1330                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1331                                 t2 &= ~PORT_WKCONN_E;
1332                         } else {
1333                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1334                                 t2 &= ~PORT_WKDISC_E;
1335                         }
1336                 } else
1337                         t2 &= ~PORT_WAKE_BITS;
1338
1339                 t1 = xhci_port_state_to_neutral(t1);
1340                 if (t1 != t2)
1341                         writel(t2, port_array[port_index]);
1342         }
1343         hcd->state = HC_STATE_SUSPENDED;
1344         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1345         spin_unlock_irqrestore(&xhci->lock, flags);
1346         return 0;
1347 }
1348
1349 /*
1350  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1351  * warm reset a USB3 device stuck in polling or compliance mode after resume.
1352  * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1353  */
1354 static bool xhci_port_missing_cas_quirk(int port_index,
1355                                              __le32 __iomem **port_array)
1356 {
1357         u32 portsc;
1358
1359         portsc = readl(port_array[port_index]);
1360
1361         /* if any of these are set we are not stuck */
1362         if (portsc & (PORT_CONNECT | PORT_CAS))
1363                 return false;
1364
1365         if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1366             ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1367                 return false;
1368
1369         /* clear wakeup/change bits, and do a warm port reset */
1370         portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1371         portsc |= PORT_WR;
1372         writel(portsc, port_array[port_index]);
1373         /* flush write */
1374         readl(port_array[port_index]);
1375         return true;
1376 }
1377
1378 int xhci_bus_resume(struct usb_hcd *hcd)
1379 {
1380         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1381         int max_ports, port_index;
1382         __le32 __iomem **port_array;
1383         struct xhci_bus_state *bus_state;
1384         u32 temp;
1385         unsigned long flags;
1386         unsigned long port_was_suspended = 0;
1387         bool need_usb2_u3_exit = false;
1388         int slot_id;
1389         int sret;
1390
1391         max_ports = xhci_get_ports(hcd, &port_array);
1392         bus_state = &xhci->bus_state[hcd_index(hcd)];
1393
1394         if (time_before(jiffies, bus_state->next_statechange))
1395                 msleep(5);
1396
1397         spin_lock_irqsave(&xhci->lock, flags);
1398         if (!HCD_HW_ACCESSIBLE(hcd)) {
1399                 spin_unlock_irqrestore(&xhci->lock, flags);
1400                 return -ESHUTDOWN;
1401         }
1402
1403         /* delay the irqs */
1404         temp = readl(&xhci->op_regs->command);
1405         temp &= ~CMD_EIE;
1406         writel(temp, &xhci->op_regs->command);
1407
1408         port_index = max_ports;
1409         while (port_index--) {
1410                 /* Check whether need resume ports. If needed
1411                    resume port and disable remote wakeup */
1412                 u32 temp;
1413
1414                 temp = readl(port_array[port_index]);
1415
1416                 /* warm reset CAS limited ports stuck in polling/compliance */
1417                 if ((xhci->quirks & XHCI_MISSING_CAS) &&
1418                     (hcd->speed >= HCD_USB3) &&
1419                     xhci_port_missing_cas_quirk(port_index, port_array)) {
1420                         xhci_dbg(xhci, "reset stuck port %d\n", port_index);
1421                         continue;
1422                 }
1423                 if (DEV_SUPERSPEED_ANY(temp))
1424                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1425                 else
1426                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
1427                 if (test_bit(port_index, &bus_state->bus_suspended) &&
1428                     (temp & PORT_PLS_MASK)) {
1429                         set_bit(port_index, &port_was_suspended);
1430                         if (!DEV_SUPERSPEED_ANY(temp)) {
1431                                 xhci_set_link_state(xhci, port_array,
1432                                                 port_index, XDEV_RESUME);
1433                                 need_usb2_u3_exit = true;
1434                         }
1435                 } else
1436                         writel(temp, port_array[port_index]);
1437         }
1438
1439         if (need_usb2_u3_exit) {
1440                 spin_unlock_irqrestore(&xhci->lock, flags);
1441                 msleep(USB_RESUME_TIMEOUT);
1442                 spin_lock_irqsave(&xhci->lock, flags);
1443         }
1444
1445         port_index = max_ports;
1446         while (port_index--) {
1447                 if (!(port_was_suspended & BIT(port_index)))
1448                         continue;
1449                 /* Clear PLC to poll it later after XDEV_U0 */
1450                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1451                 xhci_set_link_state(xhci, port_array, port_index, XDEV_U0);
1452         }
1453
1454         port_index = max_ports;
1455         while (port_index--) {
1456                 if (!(port_was_suspended & BIT(port_index)))
1457                         continue;
1458                 /* Poll and Clear PLC */
1459                 sret = xhci_handshake(port_array[port_index], PORT_PLC,
1460                                       PORT_PLC, 10 * 1000);
1461                 if (sret)
1462                         xhci_warn(xhci, "port %d resume PLC timeout\n",
1463                                   port_index);
1464                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1465                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1466                 if (slot_id)
1467                         xhci_ring_device(xhci, slot_id);
1468         }
1469
1470         (void) readl(&xhci->op_regs->command);
1471
1472         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1473         /* re-enable irqs */
1474         temp = readl(&xhci->op_regs->command);
1475         temp |= CMD_EIE;
1476         writel(temp, &xhci->op_regs->command);
1477         temp = readl(&xhci->op_regs->command);
1478
1479         spin_unlock_irqrestore(&xhci->lock, flags);
1480         return 0;
1481 }
1482
1483 #endif  /* CONFIG_PM */