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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         0x1c,                           /* bLength 28, will be adjusted later */
54         USB_DT_DEVICE_CAPABILITY,       /* Device Capability */
55         USB_SSP_CAP_TYPE,               /* bDevCapabilityType SUPERSPEED_PLUS */
56         0x00,                           /* bReserved 0 */
57         0x23, 0x00, 0x00, 0x00,         /* bmAttributes, SSAC=3 SSIC=1 */
58         0x01, 0x00,                     /* wFunctionalitySupport */
59         0x00, 0x00,                     /* wReserved 0 */
60         /* Default Sublink Speed Attributes, overwrite if custom PSI exists */
61         0x34, 0x00, 0x05, 0x00,         /* 5Gbps, symmetric, rx, ID = 4 */
62         0xb4, 0x00, 0x05, 0x00,         /* 5Gbps, symmetric, tx, ID = 4 */
63         0x35, 0x40, 0x0a, 0x00,         /* 10Gbps, SSP, symmetric, rx, ID = 5 */
64         0xb5, 0x40, 0x0a, 0x00,         /* 10Gbps, SSP, symmetric, tx, ID = 5 */
65 };
66
67 static int xhci_create_usb3_bos_desc(struct xhci_hcd *xhci, char *buf,
68                                      u16 wLength)
69 {
70         int i, ssa_count;
71         u32 temp;
72         u16 desc_size, ssp_cap_size, ssa_size = 0;
73         bool usb3_1 = false;
74
75         desc_size = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
76         ssp_cap_size = sizeof(usb_bos_descriptor) - desc_size;
77
78         /* does xhci support USB 3.1 Enhanced SuperSpeed */
79         if (xhci->usb3_rhub.min_rev >= 0x01) {
80                 /* does xhci provide a PSI table for SSA speed attributes? */
81                 if (xhci->usb3_rhub.psi_count) {
82                         /* two SSA entries for each unique PSI ID, RX and TX */
83                         ssa_count = xhci->usb3_rhub.psi_uid_count * 2;
84                         ssa_size = ssa_count * sizeof(u32);
85                         ssp_cap_size -= 16; /* skip copying the default SSA */
86                 }
87                 desc_size += ssp_cap_size;
88                 usb3_1 = true;
89         }
90         memcpy(buf, &usb_bos_descriptor, min(desc_size, wLength));
91
92         if (usb3_1) {
93                 /* modify bos descriptor bNumDeviceCaps and wTotalLength */
94                 buf[4] += 1;
95                 put_unaligned_le16(desc_size + ssa_size, &buf[2]);
96         }
97
98         if (wLength < USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE)
99                 return wLength;
100
101         /* Indicate whether the host has LTM support. */
102         temp = readl(&xhci->cap_regs->hcc_params);
103         if (HCC_LTC(temp))
104                 buf[8] |= USB_LTM_SUPPORT;
105
106         /* Set the U1 and U2 exit latencies. */
107         if ((xhci->quirks & XHCI_LPM_SUPPORT)) {
108                 temp = readl(&xhci->cap_regs->hcs_params3);
109                 buf[12] = HCS_U1_LATENCY(temp);
110                 put_unaligned_le16(HCS_U2_LATENCY(temp), &buf[13]);
111         }
112
113         /* If PSI table exists, add the custom speed attributes from it */
114         if (usb3_1 && xhci->usb3_rhub.psi_count) {
115                 u32 ssp_cap_base, bm_attrib, psi;
116                 int offset;
117
118                 ssp_cap_base = USB_DT_BOS_SIZE + USB_DT_USB_SS_CAP_SIZE;
119
120                 if (wLength < desc_size)
121                         return wLength;
122                 buf[ssp_cap_base] = ssp_cap_size + ssa_size;
123
124                 /* attribute count SSAC bits 4:0 and ID count SSIC bits 8:5 */
125                 bm_attrib = (ssa_count - 1) & 0x1f;
126                 bm_attrib |= (xhci->usb3_rhub.psi_uid_count - 1) << 5;
127                 put_unaligned_le32(bm_attrib, &buf[ssp_cap_base + 4]);
128
129                 if (wLength < desc_size + ssa_size)
130                         return wLength;
131                 /*
132                  * Create the Sublink Speed Attributes (SSA) array.
133                  * The xhci PSI field and USB 3.1 SSA fields are very similar,
134                  * but link type bits 7:6 differ for values 01b and 10b.
135                  * xhci has also only one PSI entry for a symmetric link when
136                  * USB 3.1 requires two SSA entries (RX and TX) for every link
137                  */
138                 offset = desc_size;
139                 for (i = 0; i < xhci->usb3_rhub.psi_count; i++) {
140                         psi = xhci->usb3_rhub.psi[i];
141                         psi &= ~USB_SSP_SUBLINK_SPEED_RSVD;
142                         if ((psi & PLT_MASK) == PLT_SYM) {
143                         /* Symmetric, create SSA RX and TX from one PSI entry */
144                                 put_unaligned_le32(psi, &buf[offset]);
145                                 psi |= 1 << 7;  /* turn entry to TX */
146                                 offset += 4;
147                                 if (offset >= desc_size + ssa_size)
148                                         return desc_size + ssa_size;
149                         } else if ((psi & PLT_MASK) == PLT_ASYM_RX) {
150                                 /* Asymetric RX, flip bits 7:6 for SSA */
151                                 psi ^= PLT_MASK;
152                         }
153                         put_unaligned_le32(psi, &buf[offset]);
154                         offset += 4;
155                         if (offset >= desc_size + ssa_size)
156                                 return desc_size + ssa_size;
157                 }
158         }
159         /* ssa_size is 0 for other than usb 3.1 hosts */
160         return desc_size + ssa_size;
161 }
162
163 static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
164                 struct usb_hub_descriptor *desc, int ports)
165 {
166         u16 temp;
167
168         desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
169         desc->bHubContrCurrent = 0;
170
171         desc->bNbrPorts = ports;
172         temp = 0;
173         /* Bits 1:0 - support per-port power switching, or power always on */
174         if (HCC_PPC(xhci->hcc_params))
175                 temp |= HUB_CHAR_INDV_PORT_LPSM;
176         else
177                 temp |= HUB_CHAR_NO_LPSM;
178         /* Bit  2 - root hubs are not part of a compound device */
179         /* Bits 4:3 - individual port over current protection */
180         temp |= HUB_CHAR_INDV_PORT_OCPM;
181         /* Bits 6:5 - no TTs in root ports */
182         /* Bit  7 - no port indicators */
183         desc->wHubCharacteristics = cpu_to_le16(temp);
184 }
185
186 /* Fill in the USB 2.0 roothub descriptor */
187 static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
188                 struct usb_hub_descriptor *desc)
189 {
190         int ports;
191         u16 temp;
192         __u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
193         u32 portsc;
194         unsigned int i;
195
196         ports = xhci->num_usb2_ports;
197
198         xhci_common_hub_descriptor(xhci, desc, ports);
199         desc->bDescriptorType = USB_DT_HUB;
200         temp = 1 + (ports / 8);
201         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * temp;
202
203         /* The Device Removable bits are reported on a byte granularity.
204          * If the port doesn't exist within that byte, the bit is set to 0.
205          */
206         memset(port_removable, 0, sizeof(port_removable));
207         for (i = 0; i < ports; i++) {
208                 portsc = readl(xhci->usb2_ports[i]);
209                 /* If a device is removable, PORTSC reports a 0, same as in the
210                  * hub descriptor DeviceRemovable bits.
211                  */
212                 if (portsc & PORT_DEV_REMOVE)
213                         /* This math is hairy because bit 0 of DeviceRemovable
214                          * is reserved, and bit 1 is for port 1, etc.
215                          */
216                         port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
217         }
218
219         /* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
220          * ports on it.  The USB 2.0 specification says that there are two
221          * variable length fields at the end of the hub descriptor:
222          * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
223          * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
224          * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
225          * 0xFF, so we initialize the both arrays (DeviceRemovable and
226          * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
227          * set of ports that actually exist.
228          */
229         memset(desc->u.hs.DeviceRemovable, 0xff,
230                         sizeof(desc->u.hs.DeviceRemovable));
231         memset(desc->u.hs.PortPwrCtrlMask, 0xff,
232                         sizeof(desc->u.hs.PortPwrCtrlMask));
233
234         for (i = 0; i < (ports + 1 + 7) / 8; i++)
235                 memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
236                                 sizeof(__u8));
237 }
238
239 /* Fill in the USB 3.0 roothub descriptor */
240 static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
241                 struct usb_hub_descriptor *desc)
242 {
243         int ports;
244         u16 port_removable;
245         u32 portsc;
246         unsigned int i;
247
248         ports = xhci->num_usb3_ports;
249         xhci_common_hub_descriptor(xhci, desc, ports);
250         desc->bDescriptorType = USB_DT_SS_HUB;
251         desc->bDescLength = USB_DT_SS_HUB_SIZE;
252
253         /* header decode latency should be zero for roothubs,
254          * see section 4.23.5.2.
255          */
256         desc->u.ss.bHubHdrDecLat = 0;
257         desc->u.ss.wHubDelay = 0;
258
259         port_removable = 0;
260         /* bit 0 is reserved, bit 1 is for port 1, etc. */
261         for (i = 0; i < ports; i++) {
262                 portsc = readl(xhci->usb3_ports[i]);
263                 if (portsc & PORT_DEV_REMOVE)
264                         port_removable |= 1 << (i + 1);
265         }
266
267         desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
268 }
269
270 static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
271                 struct usb_hub_descriptor *desc)
272 {
273
274         if (hcd->speed >= HCD_USB3)
275                 xhci_usb3_hub_descriptor(hcd, xhci, desc);
276         else
277                 xhci_usb2_hub_descriptor(hcd, xhci, desc);
278
279 }
280
281 static unsigned int xhci_port_speed(unsigned int port_status)
282 {
283         if (DEV_LOWSPEED(port_status))
284                 return USB_PORT_STAT_LOW_SPEED;
285         if (DEV_HIGHSPEED(port_status))
286                 return USB_PORT_STAT_HIGH_SPEED;
287         /*
288          * FIXME: Yes, we should check for full speed, but the core uses that as
289          * a default in portspeed() in usb/core/hub.c (which is the only place
290          * USB_PORT_STAT_*_SPEED is used).
291          */
292         return 0;
293 }
294
295 /*
296  * These bits are Read Only (RO) and should be saved and written to the
297  * registers: 0, 3, 10:13, 30
298  * connect status, over-current status, port speed, and device removable.
299  * connect status and port speed are also sticky - meaning they're in
300  * the AUX well and they aren't changed by a hot, warm, or cold reset.
301  */
302 #define XHCI_PORT_RO    ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
303 /*
304  * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
305  * bits 5:8, 9, 14:15, 25:27
306  * link state, port power, port indicator state, "wake on" enable state
307  */
308 #define XHCI_PORT_RWS   ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
309 /*
310  * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
311  * bit 4 (port reset)
312  */
313 #define XHCI_PORT_RW1S  ((1<<4))
314 /*
315  * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
316  * bits 1, 17, 18, 19, 20, 21, 22, 23
317  * port enable/disable, and
318  * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
319  * over-current, reset, link state, and L1 change
320  */
321 #define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
322 /*
323  * Bit 16 is RW, and writing a '1' to it causes the link state control to be
324  * latched in
325  */
326 #define XHCI_PORT_RW    ((1<<16))
327 /*
328  * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
329  * bits 2, 24, 28:31
330  */
331 #define XHCI_PORT_RZ    ((1<<2) | (1<<24) | (0xf<<28))
332
333 /*
334  * Given a port state, this function returns a value that would result in the
335  * port being in the same state, if the value was written to the port status
336  * control register.
337  * Save Read Only (RO) bits and save read/write bits where
338  * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
339  * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
340  */
341 u32 xhci_port_state_to_neutral(u32 state)
342 {
343         /* Save read-only status and port state */
344         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
345 }
346
347 /*
348  * find slot id based on port number.
349  * @port: The one-based port number from one of the two split roothubs.
350  */
351 int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
352                 u16 port)
353 {
354         int slot_id;
355         int i;
356         enum usb_device_speed speed;
357
358         slot_id = 0;
359         for (i = 0; i < MAX_HC_SLOTS; i++) {
360                 if (!xhci->devs[i])
361                         continue;
362                 speed = xhci->devs[i]->udev->speed;
363                 if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
364                                 && xhci->devs[i]->fake_port == port) {
365                         slot_id = i;
366                         break;
367                 }
368         }
369
370         return slot_id;
371 }
372
373 /*
374  * Stop device
375  * It issues stop endpoint command for EP 0 to 30. And wait the last command
376  * to complete.
377  * suspend will set to 1, if suspend bit need to set in command.
378  */
379 static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
380 {
381         struct xhci_virt_device *virt_dev;
382         struct xhci_command *cmd;
383         unsigned long flags;
384         int ret;
385         int i;
386
387         ret = 0;
388         virt_dev = xhci->devs[slot_id];
389         if (!virt_dev)
390                 return -ENODEV;
391
392         trace_xhci_stop_device(virt_dev);
393
394         cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
395         if (!cmd) {
396                 xhci_dbg(xhci, "Couldn't allocate command structure.\n");
397                 return -ENOMEM;
398         }
399
400         spin_lock_irqsave(&xhci->lock, flags);
401         for (i = LAST_EP_INDEX; i > 0; i--) {
402                 if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) {
403                         struct xhci_command *command;
404                         command = xhci_alloc_command(xhci, false, false,
405                                                      GFP_NOWAIT);
406                         if (!command) {
407                                 spin_unlock_irqrestore(&xhci->lock, flags);
408                                 xhci_free_command(xhci, cmd);
409                                 return -ENOMEM;
410
411                         }
412                         xhci_queue_stop_endpoint(xhci, command, slot_id, i,
413                                                  suspend);
414                 }
415         }
416         xhci_queue_stop_endpoint(xhci, cmd, slot_id, 0, suspend);
417         xhci_ring_cmd_db(xhci);
418         spin_unlock_irqrestore(&xhci->lock, flags);
419
420         /* Wait for last stop endpoint command to finish */
421         wait_for_completion(cmd->completion);
422
423         if (cmd->status == COMP_COMMAND_ABORTED ||
424                         cmd->status == COMP_STOPPED) {
425                 xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
426                 ret = -ETIME;
427         }
428         xhci_free_command(xhci, cmd);
429         return ret;
430 }
431
432 /*
433  * Ring device, it rings the all doorbells unconditionally.
434  */
435 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
436 {
437         int i, s;
438         struct xhci_virt_ep *ep;
439
440         for (i = 0; i < LAST_EP_INDEX + 1; i++) {
441                 ep = &xhci->devs[slot_id]->eps[i];
442
443                 if (ep->ep_state & EP_HAS_STREAMS) {
444                         for (s = 1; s < ep->stream_info->num_streams; s++)
445                                 xhci_ring_ep_doorbell(xhci, slot_id, i, s);
446                 } else if (ep->ring && ep->ring->dequeue) {
447                         xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
448                 }
449         }
450
451         return;
452 }
453
454 static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
455                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
456 {
457         /* Don't allow the USB core to disable SuperSpeed ports. */
458         if (hcd->speed >= HCD_USB3) {
459                 xhci_dbg(xhci, "Ignoring request to disable "
460                                 "SuperSpeed port.\n");
461                 return;
462         }
463
464         if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
465                 xhci_dbg(xhci,
466                          "Broken Port Enabled/Disabled, ignoring port disable request.\n");
467                 return;
468         }
469
470         /* Write 1 to disable the port */
471         writel(port_status | PORT_PE, addr);
472         port_status = readl(addr);
473         xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
474                         wIndex, port_status);
475 }
476
477 static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
478                 u16 wIndex, __le32 __iomem *addr, u32 port_status)
479 {
480         char *port_change_bit;
481         u32 status;
482
483         switch (wValue) {
484         case USB_PORT_FEAT_C_RESET:
485                 status = PORT_RC;
486                 port_change_bit = "reset";
487                 break;
488         case USB_PORT_FEAT_C_BH_PORT_RESET:
489                 status = PORT_WRC;
490                 port_change_bit = "warm(BH) reset";
491                 break;
492         case USB_PORT_FEAT_C_CONNECTION:
493                 status = PORT_CSC;
494                 port_change_bit = "connect";
495                 break;
496         case USB_PORT_FEAT_C_OVER_CURRENT:
497                 status = PORT_OCC;
498                 port_change_bit = "over-current";
499                 break;
500         case USB_PORT_FEAT_C_ENABLE:
501                 status = PORT_PEC;
502                 port_change_bit = "enable/disable";
503                 break;
504         case USB_PORT_FEAT_C_SUSPEND:
505                 status = PORT_PLC;
506                 port_change_bit = "suspend/resume";
507                 break;
508         case USB_PORT_FEAT_C_PORT_LINK_STATE:
509                 status = PORT_PLC;
510                 port_change_bit = "link state";
511                 break;
512         case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
513                 status = PORT_CEC;
514                 port_change_bit = "config error";
515                 break;
516         default:
517                 /* Should never happen */
518                 return;
519         }
520         /* Change bits are all write 1 to clear */
521         writel(port_status | status, addr);
522         port_status = readl(addr);
523         xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
524                         port_change_bit, wIndex, port_status);
525 }
526
527 static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
528 {
529         int max_ports;
530         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
531
532         if (hcd->speed >= HCD_USB3) {
533                 max_ports = xhci->num_usb3_ports;
534                 *port_array = xhci->usb3_ports;
535         } else {
536                 max_ports = xhci->num_usb2_ports;
537                 *port_array = xhci->usb2_ports;
538         }
539
540         return max_ports;
541 }
542
543 void xhci_set_link_state(struct xhci_hcd *xhci, __le32 __iomem **port_array,
544                                 int port_id, u32 link_state)
545 {
546         u32 temp;
547
548         temp = readl(port_array[port_id]);
549         temp = xhci_port_state_to_neutral(temp);
550         temp &= ~PORT_PLS_MASK;
551         temp |= PORT_LINK_STROBE | link_state;
552         writel(temp, port_array[port_id]);
553 }
554
555 static void xhci_set_remote_wake_mask(struct xhci_hcd *xhci,
556                 __le32 __iomem **port_array, int port_id, u16 wake_mask)
557 {
558         u32 temp;
559
560         temp = readl(port_array[port_id]);
561         temp = xhci_port_state_to_neutral(temp);
562
563         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_CONNECT)
564                 temp |= PORT_WKCONN_E;
565         else
566                 temp &= ~PORT_WKCONN_E;
567
568         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT)
569                 temp |= PORT_WKDISC_E;
570         else
571                 temp &= ~PORT_WKDISC_E;
572
573         if (wake_mask & USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT)
574                 temp |= PORT_WKOC_E;
575         else
576                 temp &= ~PORT_WKOC_E;
577
578         writel(temp, port_array[port_id]);
579 }
580
581 /* Test and clear port RWC bit */
582 void xhci_test_and_clear_bit(struct xhci_hcd *xhci, __le32 __iomem **port_array,
583                                 int port_id, u32 port_bit)
584 {
585         u32 temp;
586
587         temp = readl(port_array[port_id]);
588         if (temp & port_bit) {
589                 temp = xhci_port_state_to_neutral(temp);
590                 temp |= port_bit;
591                 writel(temp, port_array[port_id]);
592         }
593 }
594
595 /* Updates Link Status for USB 2.1 port */
596 static void xhci_hub_report_usb2_link_state(u32 *status, u32 status_reg)
597 {
598         if ((status_reg & PORT_PLS_MASK) == XDEV_U2)
599                 *status |= USB_PORT_STAT_L1;
600 }
601
602 /* Updates Link Status for super Speed port */
603 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
604                 u32 *status, u32 status_reg)
605 {
606         u32 pls = status_reg & PORT_PLS_MASK;
607
608         /* resume state is a xHCI internal state.
609          * Do not report it to usb core, instead, pretend to be U3,
610          * thus usb core knows it's not ready for transfer
611          */
612         if (pls == XDEV_RESUME) {
613                 *status |= USB_SS_PORT_LS_U3;
614                 return;
615         }
616
617         /* When the CAS bit is set then warm reset
618          * should be performed on port
619          */
620         if (status_reg & PORT_CAS) {
621                 /* The CAS bit can be set while the port is
622                  * in any link state.
623                  * Only roothubs have CAS bit, so we
624                  * pretend to be in compliance mode
625                  * unless we're already in compliance
626                  * or the inactive state.
627                  */
628                 if (pls != USB_SS_PORT_LS_COMP_MOD &&
629                     pls != USB_SS_PORT_LS_SS_INACTIVE) {
630                         pls = USB_SS_PORT_LS_COMP_MOD;
631                 }
632                 /* Return also connection bit -
633                  * hub state machine resets port
634                  * when this bit is set.
635                  */
636                 pls |= USB_PORT_STAT_CONNECTION;
637         } else {
638                 /*
639                  * If CAS bit isn't set but the Port is already at
640                  * Compliance Mode, fake a connection so the USB core
641                  * notices the Compliance state and resets the port.
642                  * This resolves an issue generated by the SN65LVPE502CP
643                  * in which sometimes the port enters compliance mode
644                  * caused by a delay on the host-device negotiation.
645                  */
646                 if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
647                                 (pls == USB_SS_PORT_LS_COMP_MOD))
648                         pls |= USB_PORT_STAT_CONNECTION;
649         }
650
651         /* update status field */
652         *status |= pls;
653 }
654
655 /*
656  * Function for Compliance Mode Quirk.
657  *
658  * This Function verifies if all xhc USB3 ports have entered U0, if so,
659  * the compliance mode timer is deleted. A port won't enter
660  * compliance mode if it has previously entered U0.
661  */
662 static void xhci_del_comp_mod_timer(struct xhci_hcd *xhci, u32 status,
663                                     u16 wIndex)
664 {
665         u32 all_ports_seen_u0 = ((1 << xhci->num_usb3_ports)-1);
666         bool port_in_u0 = ((status & PORT_PLS_MASK) == XDEV_U0);
667
668         if (!(xhci->quirks & XHCI_COMP_MODE_QUIRK))
669                 return;
670
671         if ((xhci->port_status_u0 != all_ports_seen_u0) && port_in_u0) {
672                 xhci->port_status_u0 |= 1 << wIndex;
673                 if (xhci->port_status_u0 == all_ports_seen_u0) {
674                         del_timer_sync(&xhci->comp_mode_recovery_timer);
675                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
676                                 "All USB3 ports have entered U0 already!");
677                         xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
678                                 "Compliance Mode Recovery Timer Deleted.");
679                 }
680         }
681 }
682
683 static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
684 {
685         u32 ext_stat = 0;
686         int speed_id;
687
688         /* only support rx and tx lane counts of 1 in usb3.1 spec */
689         speed_id = DEV_PORT_SPEED(raw_port_status);
690         ext_stat |= speed_id;           /* bits 3:0, RX speed id */
691         ext_stat |= speed_id << 4;      /* bits 7:4, TX speed id */
692
693         ext_stat |= PORT_RX_LANES(port_li) << 8;  /* bits 11:8 Rx lane count */
694         ext_stat |= PORT_TX_LANES(port_li) << 12; /* bits 15:12 Tx lane count */
695
696         return ext_stat;
697 }
698
699 /*
700  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
701  * 3.0 hubs use.
702  *
703  * Possible side effects:
704  *  - Mark a port as being done with device resume,
705  *    and ring the endpoint doorbells.
706  *  - Stop the Synopsys redriver Compliance Mode polling.
707  *  - Drop and reacquire the xHCI lock, in order to wait for port resume.
708  */
709 static u32 xhci_get_port_status(struct usb_hcd *hcd,
710                 struct xhci_bus_state *bus_state,
711                 __le32 __iomem **port_array,
712                 u16 wIndex, u32 raw_port_status,
713                 unsigned long flags)
714         __releases(&xhci->lock)
715         __acquires(&xhci->lock)
716 {
717         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
718         u32 status = 0;
719         int slot_id;
720
721         /* wPortChange bits */
722         if (raw_port_status & PORT_CSC)
723                 status |= USB_PORT_STAT_C_CONNECTION << 16;
724         if (raw_port_status & PORT_PEC)
725                 status |= USB_PORT_STAT_C_ENABLE << 16;
726         if ((raw_port_status & PORT_OCC))
727                 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
728         if ((raw_port_status & PORT_RC))
729                 status |= USB_PORT_STAT_C_RESET << 16;
730         /* USB3.0 only */
731         if (hcd->speed >= HCD_USB3) {
732                 /* Port link change with port in resume state should not be
733                  * reported to usbcore, as this is an internal state to be
734                  * handled by xhci driver. Reporting PLC to usbcore may
735                  * cause usbcore clearing PLC first and port change event
736                  * irq won't be generated.
737                  */
738                 if ((raw_port_status & PORT_PLC) &&
739                         (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME)
740                         status |= USB_PORT_STAT_C_LINK_STATE << 16;
741                 if ((raw_port_status & PORT_WRC))
742                         status |= USB_PORT_STAT_C_BH_RESET << 16;
743                 if ((raw_port_status & PORT_CEC))
744                         status |= USB_PORT_STAT_C_CONFIG_ERROR << 16;
745         }
746
747         if (hcd->speed < HCD_USB3) {
748                 if ((raw_port_status & PORT_PLS_MASK) == XDEV_U3
749                                 && (raw_port_status & PORT_POWER))
750                         status |= USB_PORT_STAT_SUSPEND;
751         }
752         if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
753                 !DEV_SUPERSPEED_ANY(raw_port_status)) {
754                 if ((raw_port_status & PORT_RESET) ||
755                                 !(raw_port_status & PORT_PE))
756                         return 0xffffffff;
757                 /* did port event handler already start resume timing? */
758                 if (!bus_state->resume_done[wIndex]) {
759                         /* If not, maybe we are in a host initated resume? */
760                         if (test_bit(wIndex, &bus_state->resuming_ports)) {
761                                 /* Host initated resume doesn't time the resume
762                                  * signalling using resume_done[].
763                                  * It manually sets RESUME state, sleeps 20ms
764                                  * and sets U0 state. This should probably be
765                                  * changed, but not right now.
766                                  */
767                         } else {
768                                 /* port resume was discovered now and here,
769                                  * start resume timing
770                                  */
771                                 unsigned long timeout = jiffies +
772                                         msecs_to_jiffies(USB_RESUME_TIMEOUT);
773
774                                 set_bit(wIndex, &bus_state->resuming_ports);
775                                 bus_state->resume_done[wIndex] = timeout;
776                                 mod_timer(&hcd->rh_timer, timeout);
777                         }
778                 /* Has resume been signalled for USB_RESUME_TIME yet? */
779                 } else if (time_after_eq(jiffies,
780                                          bus_state->resume_done[wIndex])) {
781                         int time_left;
782
783                         xhci_dbg(xhci, "Resume USB2 port %d\n",
784                                         wIndex + 1);
785                         bus_state->resume_done[wIndex] = 0;
786                         clear_bit(wIndex, &bus_state->resuming_ports);
787
788                         set_bit(wIndex, &bus_state->rexit_ports);
789                         xhci_set_link_state(xhci, port_array, wIndex,
790                                         XDEV_U0);
791
792                         spin_unlock_irqrestore(&xhci->lock, flags);
793                         time_left = wait_for_completion_timeout(
794                                         &bus_state->rexit_done[wIndex],
795                                         msecs_to_jiffies(
796                                                 XHCI_MAX_REXIT_TIMEOUT));
797                         spin_lock_irqsave(&xhci->lock, flags);
798
799                         if (time_left) {
800                                 slot_id = xhci_find_slot_id_by_port(hcd,
801                                                 xhci, wIndex + 1);
802                                 if (!slot_id) {
803                                         xhci_dbg(xhci, "slot_id is zero\n");
804                                         return 0xffffffff;
805                                 }
806                                 xhci_ring_device(xhci, slot_id);
807                         } else {
808                                 int port_status = readl(port_array[wIndex]);
809                                 xhci_warn(xhci, "Port resume took longer than %i msec, port status = 0x%x\n",
810                                                 XHCI_MAX_REXIT_TIMEOUT,
811                                                 port_status);
812                                 status |= USB_PORT_STAT_SUSPEND;
813                                 clear_bit(wIndex, &bus_state->rexit_ports);
814                         }
815
816                         bus_state->port_c_suspend |= 1 << wIndex;
817                         bus_state->suspended_ports &= ~(1 << wIndex);
818                 } else {
819                         /*
820                          * The resume has been signaling for less than
821                          * USB_RESUME_TIME. Report the port status as SUSPEND,
822                          * let the usbcore check port status again and clear
823                          * resume signaling later.
824                          */
825                         status |= USB_PORT_STAT_SUSPEND;
826                 }
827         }
828         /*
829          * Clear stale usb2 resume signalling variables in case port changed
830          * state during resume signalling. For example on error
831          */
832         if ((bus_state->resume_done[wIndex] ||
833              test_bit(wIndex, &bus_state->resuming_ports)) &&
834             (raw_port_status & PORT_PLS_MASK) != XDEV_U3 &&
835             (raw_port_status & PORT_PLS_MASK) != XDEV_RESUME) {
836                 bus_state->resume_done[wIndex] = 0;
837                 clear_bit(wIndex, &bus_state->resuming_ports);
838         }
839
840
841         if ((raw_port_status & PORT_PLS_MASK) == XDEV_U0 &&
842             (raw_port_status & PORT_POWER)) {
843                 if (bus_state->suspended_ports & (1 << wIndex)) {
844                         bus_state->suspended_ports &= ~(1 << wIndex);
845                         if (hcd->speed < HCD_USB3)
846                                 bus_state->port_c_suspend |= 1 << wIndex;
847                 }
848                 bus_state->resume_done[wIndex] = 0;
849                 clear_bit(wIndex, &bus_state->resuming_ports);
850         }
851         if (raw_port_status & PORT_CONNECT) {
852                 status |= USB_PORT_STAT_CONNECTION;
853                 status |= xhci_port_speed(raw_port_status);
854         }
855         if (raw_port_status & PORT_PE)
856                 status |= USB_PORT_STAT_ENABLE;
857         if (raw_port_status & PORT_OC)
858                 status |= USB_PORT_STAT_OVERCURRENT;
859         if (raw_port_status & PORT_RESET)
860                 status |= USB_PORT_STAT_RESET;
861         if (raw_port_status & PORT_POWER) {
862                 if (hcd->speed >= HCD_USB3)
863                         status |= USB_SS_PORT_STAT_POWER;
864                 else
865                         status |= USB_PORT_STAT_POWER;
866         }
867         /* Update Port Link State */
868         if (hcd->speed >= HCD_USB3) {
869                 xhci_hub_report_usb3_link_state(xhci, &status, raw_port_status);
870                 /*
871                  * Verify if all USB3 Ports Have entered U0 already.
872                  * Delete Compliance Mode Timer if so.
873                  */
874                 xhci_del_comp_mod_timer(xhci, raw_port_status, wIndex);
875         } else {
876                 xhci_hub_report_usb2_link_state(&status, raw_port_status);
877         }
878         if (bus_state->port_c_suspend & (1 << wIndex))
879                 status |= USB_PORT_STAT_C_SUSPEND << 16;
880
881         return status;
882 }
883
884 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
885                 u16 wIndex, char *buf, u16 wLength)
886 {
887         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
888         int max_ports;
889         unsigned long flags;
890         u32 temp, status;
891         int retval = 0;
892         __le32 __iomem **port_array;
893         int slot_id;
894         struct xhci_bus_state *bus_state;
895         u16 link_state = 0;
896         u16 wake_mask = 0;
897         u16 timeout = 0;
898
899         max_ports = xhci_get_ports(hcd, &port_array);
900         bus_state = &xhci->bus_state[hcd_index(hcd)];
901
902         spin_lock_irqsave(&xhci->lock, flags);
903         switch (typeReq) {
904         case GetHubStatus:
905                 /* No power source, over-current reported per port */
906                 memset(buf, 0, 4);
907                 break;
908         case GetHubDescriptor:
909                 /* Check to make sure userspace is asking for the USB 3.0 hub
910                  * descriptor for the USB 3.0 roothub.  If not, we stall the
911                  * endpoint, like external hubs do.
912                  */
913                 if (hcd->speed >= HCD_USB3 &&
914                                 (wLength < USB_DT_SS_HUB_SIZE ||
915                                  wValue != (USB_DT_SS_HUB << 8))) {
916                         xhci_dbg(xhci, "Wrong hub descriptor type for "
917                                         "USB 3.0 roothub.\n");
918                         goto error;
919                 }
920                 xhci_hub_descriptor(hcd, xhci,
921                                 (struct usb_hub_descriptor *) buf);
922                 break;
923         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
924                 if ((wValue & 0xff00) != (USB_DT_BOS << 8))
925                         goto error;
926
927                 if (hcd->speed < HCD_USB3)
928                         goto error;
929
930                 retval = xhci_create_usb3_bos_desc(xhci, buf, wLength);
931                 spin_unlock_irqrestore(&xhci->lock, flags);
932                 return retval;
933         case GetPortStatus:
934                 if (!wIndex || wIndex > max_ports)
935                         goto error;
936                 wIndex--;
937                 temp = readl(port_array[wIndex]);
938                 if (temp == 0xffffffff) {
939                         retval = -ENODEV;
940                         break;
941                 }
942                 status = xhci_get_port_status(hcd, bus_state, port_array,
943                                 wIndex, temp, flags);
944                 if (status == 0xffffffff)
945                         goto error;
946
947                 xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n",
948                                 wIndex, temp);
949                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
950
951                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
952                 /* if USB 3.1 extended port status return additional 4 bytes */
953                 if (wValue == 0x02) {
954                         u32 port_li;
955
956                         if (hcd->speed < HCD_USB31 || wLength != 8) {
957                                 xhci_err(xhci, "get ext port status invalid parameter\n");
958                                 retval = -EINVAL;
959                                 break;
960                         }
961                         port_li = readl(port_array[wIndex] + PORTLI);
962                         status = xhci_get_ext_port_status(temp, port_li);
963                         put_unaligned_le32(cpu_to_le32(status), &buf[4]);
964                 }
965                 break;
966         case SetPortFeature:
967                 if (wValue == USB_PORT_FEAT_LINK_STATE)
968                         link_state = (wIndex & 0xff00) >> 3;
969                 if (wValue == USB_PORT_FEAT_REMOTE_WAKE_MASK)
970                         wake_mask = wIndex & 0xff00;
971                 /* The MSB of wIndex is the U1/U2 timeout */
972                 timeout = (wIndex & 0xff00) >> 8;
973                 wIndex &= 0xff;
974                 if (!wIndex || wIndex > max_ports)
975                         goto error;
976                 wIndex--;
977                 temp = readl(port_array[wIndex]);
978                 if (temp == 0xffffffff) {
979                         retval = -ENODEV;
980                         break;
981                 }
982                 temp = xhci_port_state_to_neutral(temp);
983                 /* FIXME: What new port features do we need to support? */
984                 switch (wValue) {
985                 case USB_PORT_FEAT_SUSPEND:
986                         temp = readl(port_array[wIndex]);
987                         if ((temp & PORT_PLS_MASK) != XDEV_U0) {
988                                 /* Resume the port to U0 first */
989                                 xhci_set_link_state(xhci, port_array, wIndex,
990                                                         XDEV_U0);
991                                 spin_unlock_irqrestore(&xhci->lock, flags);
992                                 msleep(10);
993                                 spin_lock_irqsave(&xhci->lock, flags);
994                         }
995                         /* In spec software should not attempt to suspend
996                          * a port unless the port reports that it is in the
997                          * enabled (PED = â€˜1’,PLS < â€˜3’) state.
998                          */
999                         temp = readl(port_array[wIndex]);
1000                         if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
1001                                 || (temp & PORT_PLS_MASK) >= XDEV_U3) {
1002                                 xhci_warn(xhci, "USB core suspending device not in U0/U1/U2.\n");
1003                                 goto error;
1004                         }
1005
1006                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1007                                         wIndex + 1);
1008                         if (!slot_id) {
1009                                 xhci_warn(xhci, "slot_id is zero\n");
1010                                 goto error;
1011                         }
1012                         /* unlock to execute stop endpoint commands */
1013                         spin_unlock_irqrestore(&xhci->lock, flags);
1014                         xhci_stop_device(xhci, slot_id, 1);
1015                         spin_lock_irqsave(&xhci->lock, flags);
1016
1017                         xhci_set_link_state(xhci, port_array, wIndex, XDEV_U3);
1018
1019                         spin_unlock_irqrestore(&xhci->lock, flags);
1020                         msleep(10); /* wait device to enter */
1021                         spin_lock_irqsave(&xhci->lock, flags);
1022
1023                         temp = readl(port_array[wIndex]);
1024                         bus_state->suspended_ports |= 1 << wIndex;
1025                         break;
1026                 case USB_PORT_FEAT_LINK_STATE:
1027                         temp = readl(port_array[wIndex]);
1028
1029                         /* Disable port */
1030                         if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
1031                                 xhci_dbg(xhci, "Disable port %d\n", wIndex);
1032                                 temp = xhci_port_state_to_neutral(temp);
1033                                 /*
1034                                  * Clear all change bits, so that we get a new
1035                                  * connection event.
1036                                  */
1037                                 temp |= PORT_CSC | PORT_PEC | PORT_WRC |
1038                                         PORT_OCC | PORT_RC | PORT_PLC |
1039                                         PORT_CEC;
1040                                 writel(temp | PORT_PE, port_array[wIndex]);
1041                                 temp = readl(port_array[wIndex]);
1042                                 break;
1043                         }
1044
1045                         /* Put link in RxDetect (enable port) */
1046                         if (link_state == USB_SS_PORT_LS_RX_DETECT) {
1047                                 xhci_dbg(xhci, "Enable port %d\n", wIndex);
1048                                 xhci_set_link_state(xhci, port_array, wIndex,
1049                                                 link_state);
1050                                 temp = readl(port_array[wIndex]);
1051                                 break;
1052                         }
1053
1054                         /* Software should not attempt to set
1055                          * port link state above '3' (U3) and the port
1056                          * must be enabled.
1057                          */
1058                         if ((temp & PORT_PE) == 0 ||
1059                                 (link_state > USB_SS_PORT_LS_U3)) {
1060                                 xhci_warn(xhci, "Cannot set link state.\n");
1061                                 goto error;
1062                         }
1063
1064                         if (link_state == USB_SS_PORT_LS_U3) {
1065                                 slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1066                                                 wIndex + 1);
1067                                 if (slot_id) {
1068                                         /* unlock to execute stop endpoint
1069                                          * commands */
1070                                         spin_unlock_irqrestore(&xhci->lock,
1071                                                                 flags);
1072                                         xhci_stop_device(xhci, slot_id, 1);
1073                                         spin_lock_irqsave(&xhci->lock, flags);
1074                                 }
1075                         }
1076
1077                         xhci_set_link_state(xhci, port_array, wIndex,
1078                                                 link_state);
1079
1080                         spin_unlock_irqrestore(&xhci->lock, flags);
1081                         msleep(20); /* wait device to enter */
1082                         spin_lock_irqsave(&xhci->lock, flags);
1083
1084                         temp = readl(port_array[wIndex]);
1085                         if (link_state == USB_SS_PORT_LS_U3)
1086                                 bus_state->suspended_ports |= 1 << wIndex;
1087                         break;
1088                 case USB_PORT_FEAT_POWER:
1089                         /*
1090                          * Turn on ports, even if there isn't per-port switching.
1091                          * HC will report connect events even before this is set.
1092                          * However, hub_wq will ignore the roothub events until
1093                          * the roothub is registered.
1094                          */
1095                         writel(temp | PORT_POWER, port_array[wIndex]);
1096
1097                         temp = readl(port_array[wIndex]);
1098                         xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
1099
1100                         spin_unlock_irqrestore(&xhci->lock, flags);
1101                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1102                                         wIndex);
1103                         if (temp)
1104                                 usb_acpi_set_power_state(hcd->self.root_hub,
1105                                                 wIndex, true);
1106                         spin_lock_irqsave(&xhci->lock, flags);
1107                         break;
1108                 case USB_PORT_FEAT_RESET:
1109                         temp = (temp | PORT_RESET);
1110                         writel(temp, port_array[wIndex]);
1111
1112                         temp = readl(port_array[wIndex]);
1113                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
1114                         break;
1115                 case USB_PORT_FEAT_REMOTE_WAKE_MASK:
1116                         xhci_set_remote_wake_mask(xhci, port_array,
1117                                         wIndex, wake_mask);
1118                         temp = readl(port_array[wIndex]);
1119                         xhci_dbg(xhci, "set port remote wake mask, "
1120                                         "actual port %d status  = 0x%x\n",
1121                                         wIndex, temp);
1122                         break;
1123                 case USB_PORT_FEAT_BH_PORT_RESET:
1124                         temp |= PORT_WR;
1125                         writel(temp, port_array[wIndex]);
1126
1127                         temp = readl(port_array[wIndex]);
1128                         break;
1129                 case USB_PORT_FEAT_U1_TIMEOUT:
1130                         if (hcd->speed < HCD_USB3)
1131                                 goto error;
1132                         temp = readl(port_array[wIndex] + PORTPMSC);
1133                         temp &= ~PORT_U1_TIMEOUT_MASK;
1134                         temp |= PORT_U1_TIMEOUT(timeout);
1135                         writel(temp, port_array[wIndex] + PORTPMSC);
1136                         break;
1137                 case USB_PORT_FEAT_U2_TIMEOUT:
1138                         if (hcd->speed < HCD_USB3)
1139                                 goto error;
1140                         temp = readl(port_array[wIndex] + PORTPMSC);
1141                         temp &= ~PORT_U2_TIMEOUT_MASK;
1142                         temp |= PORT_U2_TIMEOUT(timeout);
1143                         writel(temp, port_array[wIndex] + PORTPMSC);
1144                         break;
1145                 default:
1146                         goto error;
1147                 }
1148                 /* unblock any posted writes */
1149                 temp = readl(port_array[wIndex]);
1150                 break;
1151         case ClearPortFeature:
1152                 if (!wIndex || wIndex > max_ports)
1153                         goto error;
1154                 wIndex--;
1155                 temp = readl(port_array[wIndex]);
1156                 if (temp == 0xffffffff) {
1157                         retval = -ENODEV;
1158                         break;
1159                 }
1160                 /* FIXME: What new port features do we need to support? */
1161                 temp = xhci_port_state_to_neutral(temp);
1162                 switch (wValue) {
1163                 case USB_PORT_FEAT_SUSPEND:
1164                         temp = readl(port_array[wIndex]);
1165                         xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
1166                         xhci_dbg(xhci, "PORTSC %04x\n", temp);
1167                         if (temp & PORT_RESET)
1168                                 goto error;
1169                         if ((temp & PORT_PLS_MASK) == XDEV_U3) {
1170                                 if ((temp & PORT_PE) == 0)
1171                                         goto error;
1172
1173                                 set_bit(wIndex, &bus_state->resuming_ports);
1174                                 xhci_set_link_state(xhci, port_array, wIndex,
1175                                                         XDEV_RESUME);
1176                                 spin_unlock_irqrestore(&xhci->lock, flags);
1177                                 msleep(USB_RESUME_TIMEOUT);
1178                                 spin_lock_irqsave(&xhci->lock, flags);
1179                                 xhci_set_link_state(xhci, port_array, wIndex,
1180                                                         XDEV_U0);
1181                                 clear_bit(wIndex, &bus_state->resuming_ports);
1182                         }
1183                         bus_state->port_c_suspend |= 1 << wIndex;
1184
1185                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1186                                         wIndex + 1);
1187                         if (!slot_id) {
1188                                 xhci_dbg(xhci, "slot_id is zero\n");
1189                                 goto error;
1190                         }
1191                         xhci_ring_device(xhci, slot_id);
1192                         break;
1193                 case USB_PORT_FEAT_C_SUSPEND:
1194                         bus_state->port_c_suspend &= ~(1 << wIndex);
1195                 case USB_PORT_FEAT_C_RESET:
1196                 case USB_PORT_FEAT_C_BH_PORT_RESET:
1197                 case USB_PORT_FEAT_C_CONNECTION:
1198                 case USB_PORT_FEAT_C_OVER_CURRENT:
1199                 case USB_PORT_FEAT_C_ENABLE:
1200                 case USB_PORT_FEAT_C_PORT_LINK_STATE:
1201                 case USB_PORT_FEAT_C_PORT_CONFIG_ERROR:
1202                         xhci_clear_port_change_bit(xhci, wValue, wIndex,
1203                                         port_array[wIndex], temp);
1204                         break;
1205                 case USB_PORT_FEAT_ENABLE:
1206                         xhci_disable_port(hcd, xhci, wIndex,
1207                                         port_array[wIndex], temp);
1208                         break;
1209                 case USB_PORT_FEAT_POWER:
1210                         writel(temp & ~PORT_POWER, port_array[wIndex]);
1211
1212                         spin_unlock_irqrestore(&xhci->lock, flags);
1213                         temp = usb_acpi_power_manageable(hcd->self.root_hub,
1214                                         wIndex);
1215                         if (temp)
1216                                 usb_acpi_set_power_state(hcd->self.root_hub,
1217                                                 wIndex, false);
1218                         spin_lock_irqsave(&xhci->lock, flags);
1219                         break;
1220                 default:
1221                         goto error;
1222                 }
1223                 break;
1224         default:
1225 error:
1226                 /* "stall" on error */
1227                 retval = -EPIPE;
1228         }
1229         spin_unlock_irqrestore(&xhci->lock, flags);
1230         return retval;
1231 }
1232
1233 /*
1234  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
1235  * Ports are 0-indexed from the HCD point of view,
1236  * and 1-indexed from the USB core pointer of view.
1237  *
1238  * Note that the status change bits will be cleared as soon as a port status
1239  * change event is generated, so we use the saved status from that event.
1240  */
1241 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
1242 {
1243         unsigned long flags;
1244         u32 temp, status;
1245         u32 mask;
1246         int i, retval;
1247         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1248         int max_ports;
1249         __le32 __iomem **port_array;
1250         struct xhci_bus_state *bus_state;
1251         bool reset_change = false;
1252
1253         max_ports = xhci_get_ports(hcd, &port_array);
1254         bus_state = &xhci->bus_state[hcd_index(hcd)];
1255
1256         /* Initial status is no changes */
1257         retval = (max_ports + 8) / 8;
1258         memset(buf, 0, retval);
1259
1260         /*
1261          * Inform the usbcore about resume-in-progress by returning
1262          * a non-zero value even if there are no status changes.
1263          */
1264         status = bus_state->resuming_ports;
1265
1266         mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC;
1267
1268         spin_lock_irqsave(&xhci->lock, flags);
1269         /* For each port, did anything change?  If so, set that bit in buf. */
1270         for (i = 0; i < max_ports; i++) {
1271                 temp = readl(port_array[i]);
1272                 if (temp == 0xffffffff) {
1273                         retval = -ENODEV;
1274                         break;
1275                 }
1276                 if ((temp & mask) != 0 ||
1277                         (bus_state->port_c_suspend & 1 << i) ||
1278                         (bus_state->resume_done[i] && time_after_eq(
1279                             jiffies, bus_state->resume_done[i]))) {
1280                         buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
1281                         status = 1;
1282                 }
1283                 if ((temp & PORT_RC))
1284                         reset_change = true;
1285         }
1286         if (!status && !reset_change) {
1287                 xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
1288                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
1289         }
1290         spin_unlock_irqrestore(&xhci->lock, flags);
1291         return status ? retval : 0;
1292 }
1293
1294 #ifdef CONFIG_PM
1295
1296 int xhci_bus_suspend(struct usb_hcd *hcd)
1297 {
1298         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1299         int max_ports, port_index;
1300         __le32 __iomem **port_array;
1301         struct xhci_bus_state *bus_state;
1302         unsigned long flags;
1303
1304         max_ports = xhci_get_ports(hcd, &port_array);
1305         bus_state = &xhci->bus_state[hcd_index(hcd)];
1306
1307         spin_lock_irqsave(&xhci->lock, flags);
1308
1309         if (hcd->self.root_hub->do_remote_wakeup) {
1310                 if (bus_state->resuming_ports ||        /* USB2 */
1311                     bus_state->port_remote_wakeup) {    /* USB3 */
1312                         spin_unlock_irqrestore(&xhci->lock, flags);
1313                         xhci_dbg(xhci, "suspend failed because a port is resuming\n");
1314                         return -EBUSY;
1315                 }
1316         }
1317
1318         port_index = max_ports;
1319         bus_state->bus_suspended = 0;
1320         while (port_index--) {
1321                 /* suspend the port if the port is not suspended */
1322                 u32 t1, t2;
1323                 int slot_id;
1324
1325                 t1 = readl(port_array[port_index]);
1326                 t2 = xhci_port_state_to_neutral(t1);
1327
1328                 if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
1329                         xhci_dbg(xhci, "port %d not suspended\n", port_index);
1330                         slot_id = xhci_find_slot_id_by_port(hcd, xhci,
1331                                         port_index + 1);
1332                         if (slot_id) {
1333                                 spin_unlock_irqrestore(&xhci->lock, flags);
1334                                 xhci_stop_device(xhci, slot_id, 1);
1335                                 spin_lock_irqsave(&xhci->lock, flags);
1336                         }
1337                         t2 &= ~PORT_PLS_MASK;
1338                         t2 |= PORT_LINK_STROBE | XDEV_U3;
1339                         set_bit(port_index, &bus_state->bus_suspended);
1340                 }
1341                 /* USB core sets remote wake mask for USB 3.0 hubs,
1342                  * including the USB 3.0 roothub, but only if CONFIG_PM
1343                  * is enabled, so also enable remote wake here.
1344                  */
1345                 if (hcd->self.root_hub->do_remote_wakeup) {
1346                         if (t1 & PORT_CONNECT) {
1347                                 t2 |= PORT_WKOC_E | PORT_WKDISC_E;
1348                                 t2 &= ~PORT_WKCONN_E;
1349                         } else {
1350                                 t2 |= PORT_WKOC_E | PORT_WKCONN_E;
1351                                 t2 &= ~PORT_WKDISC_E;
1352                         }
1353                 } else
1354                         t2 &= ~PORT_WAKE_BITS;
1355
1356                 t1 = xhci_port_state_to_neutral(t1);
1357                 if (t1 != t2)
1358                         writel(t2, port_array[port_index]);
1359         }
1360         hcd->state = HC_STATE_SUSPENDED;
1361         bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
1362         spin_unlock_irqrestore(&xhci->lock, flags);
1363         return 0;
1364 }
1365
1366 /*
1367  * Workaround for missing Cold Attach Status (CAS) if device re-plugged in S3.
1368  * warm reset a USB3 device stuck in polling or compliance mode after resume.
1369  * See Intel 100/c230 series PCH specification update Doc #332692-006 Errata #8
1370  */
1371 static bool xhci_port_missing_cas_quirk(int port_index,
1372                                              __le32 __iomem **port_array)
1373 {
1374         u32 portsc;
1375
1376         portsc = readl(port_array[port_index]);
1377
1378         /* if any of these are set we are not stuck */
1379         if (portsc & (PORT_CONNECT | PORT_CAS))
1380                 return false;
1381
1382         if (((portsc & PORT_PLS_MASK) != XDEV_POLLING) &&
1383             ((portsc & PORT_PLS_MASK) != XDEV_COMP_MODE))
1384                 return false;
1385
1386         /* clear wakeup/change bits, and do a warm port reset */
1387         portsc &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1388         portsc |= PORT_WR;
1389         writel(portsc, port_array[port_index]);
1390         /* flush write */
1391         readl(port_array[port_index]);
1392         return true;
1393 }
1394
1395 int xhci_bus_resume(struct usb_hcd *hcd)
1396 {
1397         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
1398         int max_ports, port_index;
1399         __le32 __iomem **port_array;
1400         struct xhci_bus_state *bus_state;
1401         u32 temp;
1402         unsigned long flags;
1403         unsigned long port_was_suspended = 0;
1404         bool need_usb2_u3_exit = false;
1405         int slot_id;
1406         int sret;
1407
1408         max_ports = xhci_get_ports(hcd, &port_array);
1409         bus_state = &xhci->bus_state[hcd_index(hcd)];
1410
1411         if (time_before(jiffies, bus_state->next_statechange))
1412                 msleep(5);
1413
1414         spin_lock_irqsave(&xhci->lock, flags);
1415         if (!HCD_HW_ACCESSIBLE(hcd)) {
1416                 spin_unlock_irqrestore(&xhci->lock, flags);
1417                 return -ESHUTDOWN;
1418         }
1419
1420         /* delay the irqs */
1421         temp = readl(&xhci->op_regs->command);
1422         temp &= ~CMD_EIE;
1423         writel(temp, &xhci->op_regs->command);
1424
1425         port_index = max_ports;
1426         while (port_index--) {
1427                 /* Check whether need resume ports. If needed
1428                    resume port and disable remote wakeup */
1429                 u32 temp;
1430
1431                 temp = readl(port_array[port_index]);
1432
1433                 /* warm reset CAS limited ports stuck in polling/compliance */
1434                 if ((xhci->quirks & XHCI_MISSING_CAS) &&
1435                     (hcd->speed >= HCD_USB3) &&
1436                     xhci_port_missing_cas_quirk(port_index, port_array)) {
1437                         xhci_dbg(xhci, "reset stuck port %d\n", port_index);
1438                         continue;
1439                 }
1440                 if (DEV_SUPERSPEED_ANY(temp))
1441                         temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
1442                 else
1443                         temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
1444                 if (test_bit(port_index, &bus_state->bus_suspended) &&
1445                     (temp & PORT_PLS_MASK)) {
1446                         set_bit(port_index, &port_was_suspended);
1447                         if (!DEV_SUPERSPEED_ANY(temp)) {
1448                                 xhci_set_link_state(xhci, port_array,
1449                                                 port_index, XDEV_RESUME);
1450                                 need_usb2_u3_exit = true;
1451                         }
1452                 } else
1453                         writel(temp, port_array[port_index]);
1454         }
1455
1456         if (need_usb2_u3_exit) {
1457                 spin_unlock_irqrestore(&xhci->lock, flags);
1458                 msleep(USB_RESUME_TIMEOUT);
1459                 spin_lock_irqsave(&xhci->lock, flags);
1460         }
1461
1462         port_index = max_ports;
1463         while (port_index--) {
1464                 if (!(port_was_suspended & BIT(port_index)))
1465                         continue;
1466                 /* Clear PLC to poll it later after XDEV_U0 */
1467                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1468                 xhci_set_link_state(xhci, port_array, port_index, XDEV_U0);
1469         }
1470
1471         port_index = max_ports;
1472         while (port_index--) {
1473                 if (!(port_was_suspended & BIT(port_index)))
1474                         continue;
1475                 /* Poll and Clear PLC */
1476                 sret = xhci_handshake(port_array[port_index], PORT_PLC,
1477                                       PORT_PLC, 10 * 1000);
1478                 if (sret)
1479                         xhci_warn(xhci, "port %d resume PLC timeout\n",
1480                                   port_index);
1481                 xhci_test_and_clear_bit(xhci, port_array, port_index, PORT_PLC);
1482                 slot_id = xhci_find_slot_id_by_port(hcd, xhci, port_index + 1);
1483                 if (slot_id)
1484                         xhci_ring_device(xhci, slot_id);
1485         }
1486
1487         (void) readl(&xhci->op_regs->command);
1488
1489         bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
1490         /* re-enable irqs */
1491         temp = readl(&xhci->op_regs->command);
1492         temp |= CMD_EIE;
1493         writel(temp, &xhci->op_regs->command);
1494         temp = readl(&xhci->op_regs->command);
1495
1496         spin_unlock_irqrestore(&xhci->lock, flags);
1497         return 0;
1498 }
1499
1500 #endif  /* CONFIG_PM */