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#include <asm/unaligned.h>
 24
 25#include "xhci.h"
 
 26
 27#define	PORT_WAKE_BITS	(PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
 28#define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
 29			 PORT_RC | PORT_PLC | PORT_PE)
 30
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 31static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
 32		struct usb_hub_descriptor *desc, int ports)
 33{
 34	u16 temp;
 35
 36	desc->bPwrOn2PwrGood = 10;	/* xhci section 5.4.9 says 20ms max */
 37	desc->bHubContrCurrent = 0;
 38
 39	desc->bNbrPorts = ports;
 40	/* Ugh, these should be #defines, FIXME */
 41	/* Using table 11-13 in USB 2.0 spec. */
 42	temp = 0;
 43	/* Bits 1:0 - support port power switching, or power always on */
 44	if (HCC_PPC(xhci->hcc_params))
 45		temp |= 0x0001;
 46	else
 47		temp |= 0x0002;
 48	/* Bit  2 - root hubs are not part of a compound device */
 49	/* Bits 4:3 - individual port over current protection */
 50	temp |= 0x0008;
 51	/* Bits 6:5 - no TTs in root ports */
 52	/* Bit  7 - no port indicators */
 53	desc->wHubCharacteristics = cpu_to_le16(temp);
 54}
 55
 56/* Fill in the USB 2.0 roothub descriptor */
 57static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
 58		struct usb_hub_descriptor *desc)
 59{
 60	int ports;
 61	u16 temp;
 62	__u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
 63	u32 portsc;
 64	unsigned int i;
 65
 66	ports = xhci->num_usb2_ports;
 67
 68	xhci_common_hub_descriptor(xhci, desc, ports);
 69	desc->bDescriptorType = 0x29;
 70	temp = 1 + (ports / 8);
 71	desc->bDescLength = 7 + 2 * temp;
 72
 73	/* The Device Removable bits are reported on a byte granularity.
 74	 * If the port doesn't exist within that byte, the bit is set to 0.
 75	 */
 76	memset(port_removable, 0, sizeof(port_removable));
 77	for (i = 0; i < ports; i++) {
 78		portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
 79		/* If a device is removable, PORTSC reports a 0, same as in the
 80		 * hub descriptor DeviceRemovable bits.
 81		 */
 82		if (portsc & PORT_DEV_REMOVE)
 83			/* This math is hairy because bit 0 of DeviceRemovable
 84			 * is reserved, and bit 1 is for port 1, etc.
 85			 */
 86			port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
 87	}
 88
 89	/* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
 90	 * ports on it.  The USB 2.0 specification says that there are two
 91	 * variable length fields at the end of the hub descriptor:
 92	 * DeviceRemovable and PortPwrCtrlMask.  But since we can have less than
 93	 * USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
 94	 * to set PortPwrCtrlMask bits.  PortPwrCtrlMask must always be set to
 95	 * 0xFF, so we initialize the both arrays (DeviceRemovable and
 96	 * PortPwrCtrlMask) to 0xFF.  Then we set the DeviceRemovable for each
 97	 * set of ports that actually exist.
 98	 */
 99	memset(desc->u.hs.DeviceRemovable, 0xff,
100			sizeof(desc->u.hs.DeviceRemovable));
101	memset(desc->u.hs.PortPwrCtrlMask, 0xff,
102			sizeof(desc->u.hs.PortPwrCtrlMask));
103
104	for (i = 0; i < (ports + 1 + 7) / 8; i++)
105		memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
106				sizeof(__u8));
107}
108
109/* Fill in the USB 3.0 roothub descriptor */
110static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
111		struct usb_hub_descriptor *desc)
112{
113	int ports;
114	u16 port_removable;
115	u32 portsc;
116	unsigned int i;
117
118	ports = xhci->num_usb3_ports;
119	xhci_common_hub_descriptor(xhci, desc, ports);
120	desc->bDescriptorType = 0x2a;
121	desc->bDescLength = 12;
122
123	/* header decode latency should be zero for roothubs,
124	 * see section 4.23.5.2.
125	 */
126	desc->u.ss.bHubHdrDecLat = 0;
127	desc->u.ss.wHubDelay = 0;
128
129	port_removable = 0;
130	/* bit 0 is reserved, bit 1 is for port 1, etc. */
131	for (i = 0; i < ports; i++) {
132		portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
133		if (portsc & PORT_DEV_REMOVE)
134			port_removable |= 1 << (i + 1);
135	}
136	memset(&desc->u.ss.DeviceRemovable,
137			(__force __u16) cpu_to_le16(port_removable),
138			sizeof(__u16));
139}
140
141static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
142		struct usb_hub_descriptor *desc)
143{
144
145	if (hcd->speed == HCD_USB3)
146		xhci_usb3_hub_descriptor(hcd, xhci, desc);
147	else
148		xhci_usb2_hub_descriptor(hcd, xhci, desc);
149
150}
151
152static unsigned int xhci_port_speed(unsigned int port_status)
153{
154	if (DEV_LOWSPEED(port_status))
155		return USB_PORT_STAT_LOW_SPEED;
156	if (DEV_HIGHSPEED(port_status))
157		return USB_PORT_STAT_HIGH_SPEED;
158	/*
159	 * FIXME: Yes, we should check for full speed, but the core uses that as
160	 * a default in portspeed() in usb/core/hub.c (which is the only place
161	 * USB_PORT_STAT_*_SPEED is used).
162	 */
163	return 0;
164}
165
166/*
167 * These bits are Read Only (RO) and should be saved and written to the
168 * registers: 0, 3, 10:13, 30
169 * connect status, over-current status, port speed, and device removable.
170 * connect status and port speed are also sticky - meaning they're in
171 * the AUX well and they aren't changed by a hot, warm, or cold reset.
172 */
173#define	XHCI_PORT_RO	((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
174/*
175 * These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
176 * bits 5:8, 9, 14:15, 25:27
177 * link state, port power, port indicator state, "wake on" enable state
178 */
179#define XHCI_PORT_RWS	((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
180/*
181 * These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
182 * bit 4 (port reset)
183 */
184#define	XHCI_PORT_RW1S	((1<<4))
185/*
186 * These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
187 * bits 1, 17, 18, 19, 20, 21, 22, 23
188 * port enable/disable, and
189 * change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
190 * over-current, reset, link state, and L1 change
191 */
192#define XHCI_PORT_RW1CS	((1<<1) | (0x7f<<17))
193/*
194 * Bit 16 is RW, and writing a '1' to it causes the link state control to be
195 * latched in
196 */
197#define	XHCI_PORT_RW	((1<<16))
198/*
199 * These bits are Reserved Zero (RsvdZ) and zero should be written to them:
200 * bits 2, 24, 28:31
201 */
202#define	XHCI_PORT_RZ	((1<<2) | (1<<24) | (0xf<<28))
203
204/*
205 * Given a port state, this function returns a value that would result in the
206 * port being in the same state, if the value was written to the port status
207 * control register.
208 * Save Read Only (RO) bits and save read/write bits where
209 * writing a 0 clears the bit and writing a 1 sets the bit (RWS).
210 * For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
211 */
212u32 xhci_port_state_to_neutral(u32 state)
213{
214	/* Save read-only status and port state */
215	return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
216}
217
218/*
219 * find slot id based on port number.
220 * @port: The one-based port number from one of the two split roothubs.
221 */
222int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
223		u16 port)
224{
225	int slot_id;
226	int i;
227	enum usb_device_speed speed;
228
229	slot_id = 0;
230	for (i = 0; i < MAX_HC_SLOTS; i++) {
231		if (!xhci->devs[i])
232			continue;
233		speed = xhci->devs[i]->udev->speed;
234		if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3))
235				&& xhci->devs[i]->port == port) {
236			slot_id = i;
237			break;
238		}
239	}
240
241	return slot_id;
242}
243
244/*
245 * Stop device
246 * It issues stop endpoint command for EP 0 to 30. And wait the last command
247 * to complete.
248 * suspend will set to 1, if suspend bit need to set in command.
249 */
250static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
251{
252	struct xhci_virt_device *virt_dev;
253	struct xhci_command *cmd;
254	unsigned long flags;
255	int timeleft;
256	int ret;
257	int i;
258
259	ret = 0;
260	virt_dev = xhci->devs[slot_id];
 
 
 
261	cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
262	if (!cmd) {
263		xhci_dbg(xhci, "Couldn't allocate command structure.\n");
264		return -ENOMEM;
265	}
266
267	spin_lock_irqsave(&xhci->lock, flags);
268	for (i = LAST_EP_INDEX; i > 0; i--) {
269		if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
270			xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
 
 
 
 
 
 
 
 
 
 
 
271	}
272	cmd->command_trb = xhci->cmd_ring->enqueue;
273	list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
274	xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
275	xhci_ring_cmd_db(xhci);
276	spin_unlock_irqrestore(&xhci->lock, flags);
277
278	/* Wait for last stop endpoint command to finish */
279	timeleft = wait_for_completion_interruptible_timeout(
280			cmd->completion,
281			USB_CTRL_SET_TIMEOUT);
282	if (timeleft <= 0) {
283		xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
284				timeleft == 0 ? "Timeout" : "Signal");
285		spin_lock_irqsave(&xhci->lock, flags);
286		/* The timeout might have raced with the event ring handler, so
287		 * only delete from the list if the item isn't poisoned.
288		 */
289		if (cmd->cmd_list.next != LIST_POISON1)
290			list_del(&cmd->cmd_list);
291		spin_unlock_irqrestore(&xhci->lock, flags);
292		ret = -ETIME;
293		goto command_cleanup;
294	}
295
296command_cleanup:
297	xhci_free_command(xhci, cmd);
298	return ret;
299}
300
301/*
302 * Ring device, it rings the all doorbells unconditionally.
303 */
304void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
305{
306	int i;
 
307
308	for (i = 0; i < LAST_EP_INDEX + 1; i++)
309		if (xhci->devs[slot_id]->eps[i].ring &&
310		    xhci->devs[slot_id]->eps[i].ring->dequeue)
 
 
 
 
311			xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
 
 
312
313	return;
314}
315
316static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
317		u16 wIndex, __le32 __iomem *addr, u32 port_status)
318{
319	/* Don't allow the USB core to disable SuperSpeed ports. */
320	if (hcd->speed == HCD_USB3) {
321		xhci_dbg(xhci, "Ignoring request to disable "
322				"SuperSpeed port.\n");
323		return;
324	}
325
 
 
 
 
 
 
326	/* Write 1 to disable the port */
327	xhci_writel(xhci, port_status | PORT_PE, addr);
328	port_status = xhci_readl(xhci, addr);
329	xhci_dbg(xhci, "disable port, actual port %d status  = 0x%x\n",
330			wIndex, port_status);
331}
332
333static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
334		u16 wIndex, __le32 __iomem *addr, u32 port_status)
335{
336	char *port_change_bit;
337	u32 status;
338
339	switch (wValue) {
340	case USB_PORT_FEAT_C_RESET:
341		status = PORT_RC;
342		port_change_bit = "reset";
343		break;
344	case USB_PORT_FEAT_C_BH_PORT_RESET:
345		status = PORT_WRC;
346		port_change_bit = "warm(BH) reset";
347		break;
348	case USB_PORT_FEAT_C_CONNECTION:
349		status = PORT_CSC;
350		port_change_bit = "connect";
351		break;
352	case USB_PORT_FEAT_C_OVER_CURRENT:
353		status = PORT_OCC;
354		port_change_bit = "over-current";
355		break;
356	case USB_PORT_FEAT_C_ENABLE:
357		status = PORT_PEC;
358		port_change_bit = "enable/disable";
359		break;
360	case USB_PORT_FEAT_C_SUSPEND:
361		status = PORT_PLC;
362		port_change_bit = "suspend/resume";
363		break;
364	case USB_PORT_FEAT_C_PORT_LINK_STATE:
365		status = PORT_PLC;
366		port_change_bit = "link state";
367		break;
 
 
 
 
368	default:
369		/* Should never happen */
370		return;
371	}
372	/* Change bits are all write 1 to clear */
373	xhci_writel(xhci, port_status | status, addr);
374	port_status = xhci_readl(xhci, addr);
375	xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
376			port_change_bit, wIndex, port_status);
377}
378
379static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
380{
381	int max_ports;
382	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
383
384	if (hcd->speed == HCD_USB3) {
385		max_ports = xhci->num_usb3_ports;
386		*port_array = xhci->usb3_ports;
387	} else {
388		max_ports = xhci->num_usb2_ports;
389		*port_array = xhci->usb2_ports;
390	}
391
392	return max_ports;
393}
394
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
395int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
396		u16 wIndex, char *buf, u16 wLength)
397{
398	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
399	int max_ports;
400	unsigned long flags;
401	u32 temp, temp1, status;
402	int retval = 0;
403	__le32 __iomem **port_array;
404	int slot_id;
405	struct xhci_bus_state *bus_state;
406	u16 link_state = 0;
 
 
407
408	max_ports = xhci_get_ports(hcd, &port_array);
409	bus_state = &xhci->bus_state[hcd_index(hcd)];
410
411	spin_lock_irqsave(&xhci->lock, flags);
412	switch (typeReq) {
413	case GetHubStatus:
414		/* No power source, over-current reported per port */
415		memset(buf, 0, 4);
416		break;
417	case GetHubDescriptor:
418		/* Check to make sure userspace is asking for the USB 3.0 hub
419		 * descriptor for the USB 3.0 roothub.  If not, we stall the
420		 * endpoint, like external hubs do.
421		 */
422		if (hcd->speed == HCD_USB3 &&
423				(wLength < USB_DT_SS_HUB_SIZE ||
424				 wValue != (USB_DT_SS_HUB << 8))) {
425			xhci_dbg(xhci, "Wrong hub descriptor type for "
426					"USB 3.0 roothub.\n");
427			goto error;
428		}
429		xhci_hub_descriptor(hcd, xhci,
430				(struct usb_hub_descriptor *) buf);
431		break;
 
 
 
 
 
 
 
 
 
 
432	case GetPortStatus:
433		if (!wIndex || wIndex > max_ports)
434			goto error;
435		wIndex--;
436		status = 0;
437		temp = xhci_readl(xhci, port_array[wIndex]);
438		if (temp == 0xffffffff) {
439			retval = -ENODEV;
440			break;
441		}
442		xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
443
444		/* wPortChange bits */
445		if (temp & PORT_CSC)
446			status |= USB_PORT_STAT_C_CONNECTION << 16;
447		if (temp & PORT_PEC)
448			status |= USB_PORT_STAT_C_ENABLE << 16;
449		if ((temp & PORT_OCC))
450			status |= USB_PORT_STAT_C_OVERCURRENT << 16;
451		if ((temp & PORT_RC))
452			status |= USB_PORT_STAT_C_RESET << 16;
453		/* USB3.0 only */
454		if (hcd->speed == HCD_USB3) {
455			if ((temp & PORT_PLC))
456				status |= USB_PORT_STAT_C_LINK_STATE << 16;
457			if ((temp & PORT_WRC))
458				status |= USB_PORT_STAT_C_BH_RESET << 16;
459		}
460
461		if (hcd->speed != HCD_USB3) {
462			if ((temp & PORT_PLS_MASK) == XDEV_U3
463					&& (temp & PORT_POWER))
464				status |= USB_PORT_STAT_SUSPEND;
465		}
466		if ((temp & PORT_PLS_MASK) == XDEV_RESUME &&
467				!DEV_SUPERSPEED(temp)) {
468			if ((temp & PORT_RESET) || !(temp & PORT_PE))
469				goto error;
470			if (time_after_eq(jiffies,
471					bus_state->resume_done[wIndex])) {
472				xhci_dbg(xhci, "Resume USB2 port %d\n",
473					wIndex + 1);
474				bus_state->resume_done[wIndex] = 0;
475				temp1 = xhci_port_state_to_neutral(temp);
476				temp1 &= ~PORT_PLS_MASK;
477				temp1 |= PORT_LINK_STROBE | XDEV_U0;
478				xhci_writel(xhci, temp1, port_array[wIndex]);
479
480				xhci_dbg(xhci, "set port %d resume\n",
481					wIndex + 1);
482				slot_id = xhci_find_slot_id_by_port(hcd, xhci,
483								 wIndex + 1);
484				if (!slot_id) {
485					xhci_dbg(xhci, "slot_id is zero\n");
486					goto error;
487				}
488				xhci_ring_device(xhci, slot_id);
489				bus_state->port_c_suspend |= 1 << wIndex;
490				bus_state->suspended_ports &= ~(1 << wIndex);
491			} else {
492				/*
493				 * The resume has been signaling for less than
494				 * 20ms. Report the port status as SUSPEND,
495				 * let the usbcore check port status again
496				 * and clear resume signaling later.
497				 */
498				status |= USB_PORT_STAT_SUSPEND;
499			}
 
 
 
500		}
501		if ((temp & PORT_PLS_MASK) == XDEV_U0
502			&& (temp & PORT_POWER)
503			&& (bus_state->suspended_ports & (1 << wIndex))) {
504			bus_state->suspended_ports &= ~(1 << wIndex);
505			if (hcd->speed != HCD_USB3)
506				bus_state->port_c_suspend |= 1 << wIndex;
507		}
508		if (temp & PORT_CONNECT) {
509			status |= USB_PORT_STAT_CONNECTION;
510			status |= xhci_port_speed(temp);
511		}
512		if (temp & PORT_PE)
513			status |= USB_PORT_STAT_ENABLE;
514		if (temp & PORT_OC)
515			status |= USB_PORT_STAT_OVERCURRENT;
516		if (temp & PORT_RESET)
517			status |= USB_PORT_STAT_RESET;
518		if (temp & PORT_POWER) {
519			if (hcd->speed == HCD_USB3)
520				status |= USB_SS_PORT_STAT_POWER;
521			else
522				status |= USB_PORT_STAT_POWER;
523		}
524		/* Port Link State */
525		if (hcd->speed == HCD_USB3) {
526			/* resume state is a xHCI internal state.
527			 * Do not report it to usb core.
528			 */
529			if ((temp & PORT_PLS_MASK) != XDEV_RESUME)
530				status |= (temp & PORT_PLS_MASK);
531		}
532		if (bus_state->port_c_suspend & (1 << wIndex))
533			status |= 1 << USB_PORT_FEAT_C_SUSPEND;
534		xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
535		put_unaligned(cpu_to_le32(status), (__le32 *) buf);
536		break;
537	case SetPortFeature:
538		if (wValue == USB_PORT_FEAT_LINK_STATE)
539			link_state = (wIndex & 0xff00) >> 3;
 
 
 
 
540		wIndex &= 0xff;
541		if (!wIndex || wIndex > max_ports)
542			goto error;
543		wIndex--;
544		temp = xhci_readl(xhci, port_array[wIndex]);
545		if (temp == 0xffffffff) {
546			retval = -ENODEV;
547			break;
548		}
549		temp = xhci_port_state_to_neutral(temp);
550		/* FIXME: What new port features do we need to support? */
551		switch (wValue) {
552		case USB_PORT_FEAT_SUSPEND:
553			temp = xhci_readl(xhci, port_array[wIndex]);
 
 
 
 
 
 
 
 
554			/* In spec software should not attempt to suspend
555			 * a port unless the port reports that it is in the
556			 * enabled (PED = ‘1’,PLS < ‘3’) state.
557			 */
 
558			if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
559				|| (temp & PORT_PLS_MASK) >= XDEV_U3) {
560				xhci_warn(xhci, "USB core suspending device "
561					  "not in U0/U1/U2.\n");
562				goto error;
563			}
564
565			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
566					wIndex + 1);
567			if (!slot_id) {
568				xhci_warn(xhci, "slot_id is zero\n");
569				goto error;
570			}
571			/* unlock to execute stop endpoint commands */
572			spin_unlock_irqrestore(&xhci->lock, flags);
573			xhci_stop_device(xhci, slot_id, 1);
574			spin_lock_irqsave(&xhci->lock, flags);
575
576			temp = xhci_port_state_to_neutral(temp);
577			temp &= ~PORT_PLS_MASK;
578			temp |= PORT_LINK_STROBE | XDEV_U3;
579			xhci_writel(xhci, temp, port_array[wIndex]);
580
581			spin_unlock_irqrestore(&xhci->lock, flags);
582			msleep(10); /* wait device to enter */
583			spin_lock_irqsave(&xhci->lock, flags);
584
585			temp = xhci_readl(xhci, port_array[wIndex]);
586			bus_state->suspended_ports |= 1 << wIndex;
587			break;
588		case USB_PORT_FEAT_LINK_STATE:
589			temp = xhci_readl(xhci, port_array[wIndex]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
590			/* Software should not attempt to set
591			 * port link state above '5' (Rx.Detect) and the port
592			 * must be enabled.
593			 */
594			if ((temp & PORT_PE) == 0 ||
595				(link_state > USB_SS_PORT_LS_RX_DETECT)) {
596				xhci_warn(xhci, "Cannot set link state.\n");
597				goto error;
598			}
599
600			if (link_state == USB_SS_PORT_LS_U3) {
601				slot_id = xhci_find_slot_id_by_port(hcd, xhci,
602						wIndex + 1);
603				if (slot_id) {
604					/* unlock to execute stop endpoint
605					 * commands */
606					spin_unlock_irqrestore(&xhci->lock,
607								flags);
608					xhci_stop_device(xhci, slot_id, 1);
609					spin_lock_irqsave(&xhci->lock, flags);
610				}
611			}
612
613			temp = xhci_port_state_to_neutral(temp);
614			temp &= ~PORT_PLS_MASK;
615			temp |= PORT_LINK_STROBE | link_state;
616			xhci_writel(xhci, temp, port_array[wIndex]);
617
618			spin_unlock_irqrestore(&xhci->lock, flags);
619			msleep(20); /* wait device to enter */
620			spin_lock_irqsave(&xhci->lock, flags);
621
622			temp = xhci_readl(xhci, port_array[wIndex]);
623			if (link_state == USB_SS_PORT_LS_U3)
624				bus_state->suspended_ports |= 1 << wIndex;
625			break;
626		case USB_PORT_FEAT_POWER:
627			/*
628			 * Turn on ports, even if there isn't per-port switching.
629			 * HC will report connect events even before this is set.
630			 * However, khubd will ignore the roothub events until
631			 * the roothub is registered.
632			 */
633			xhci_writel(xhci, temp | PORT_POWER,
634					port_array[wIndex]);
635
636			temp = xhci_readl(xhci, port_array[wIndex]);
637			xhci_dbg(xhci, "set port power, actual port %d status  = 0x%x\n", wIndex, temp);
 
 
 
 
 
 
 
 
638			break;
639		case USB_PORT_FEAT_RESET:
640			temp = (temp | PORT_RESET);
641			xhci_writel(xhci, temp, port_array[wIndex]);
642
643			temp = xhci_readl(xhci, port_array[wIndex]);
644			xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
645			break;
 
 
 
 
 
 
 
 
646		case USB_PORT_FEAT_BH_PORT_RESET:
647			temp |= PORT_WR;
648			xhci_writel(xhci, temp, port_array[wIndex]);
649
650			temp = xhci_readl(xhci, port_array[wIndex]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
651			break;
652		default:
653			goto error;
654		}
655		/* unblock any posted writes */
656		temp = xhci_readl(xhci, port_array[wIndex]);
657		break;
658	case ClearPortFeature:
659		if (!wIndex || wIndex > max_ports)
660			goto error;
661		wIndex--;
662		temp = xhci_readl(xhci, port_array[wIndex]);
663		if (temp == 0xffffffff) {
664			retval = -ENODEV;
665			break;
666		}
667		/* FIXME: What new port features do we need to support? */
668		temp = xhci_port_state_to_neutral(temp);
669		switch (wValue) {
670		case USB_PORT_FEAT_SUSPEND:
671			temp = xhci_readl(xhci, port_array[wIndex]);
672			xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
673			xhci_dbg(xhci, "PORTSC %04x\n", temp);
674			if (temp & PORT_RESET)
675				goto error;
676			if ((temp & PORT_PLS_MASK) == XDEV_U3) {
677				if ((temp & PORT_PE) == 0)
678					goto error;
679
680				temp = xhci_port_state_to_neutral(temp);
681				temp &= ~PORT_PLS_MASK;
682				temp |= PORT_LINK_STROBE | XDEV_RESUME;
683				xhci_writel(xhci, temp,
684						port_array[wIndex]);
685
686				spin_unlock_irqrestore(&xhci->lock,
687						       flags);
688				msleep(20);
689				spin_lock_irqsave(&xhci->lock, flags);
690
691				temp = xhci_readl(xhci,
692						port_array[wIndex]);
693				temp = xhci_port_state_to_neutral(temp);
694				temp &= ~PORT_PLS_MASK;
695				temp |= PORT_LINK_STROBE | XDEV_U0;
696				xhci_writel(xhci, temp,
697						port_array[wIndex]);
698			}
699			bus_state->port_c_suspend |= 1 << wIndex;
700
701			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
702					wIndex + 1);
703			if (!slot_id) {
704				xhci_dbg(xhci, "slot_id is zero\n");
705				goto error;
706			}
707			xhci_ring_device(xhci, slot_id);
708			break;
709		case USB_PORT_FEAT_C_SUSPEND:
710			bus_state->port_c_suspend &= ~(1 << wIndex);
711		case USB_PORT_FEAT_C_RESET:
712		case USB_PORT_FEAT_C_BH_PORT_RESET:
713		case USB_PORT_FEAT_C_CONNECTION:
714		case USB_PORT_FEAT_C_OVER_CURRENT:
715		case USB_PORT_FEAT_C_ENABLE:
716		case USB_PORT_FEAT_C_PORT_LINK_STATE:
 
717			xhci_clear_port_change_bit(xhci, wValue, wIndex,
718					port_array[wIndex], temp);
719			break;
720		case USB_PORT_FEAT_ENABLE:
721			xhci_disable_port(hcd, xhci, wIndex,
722					port_array[wIndex], temp);
723			break;
 
 
 
 
 
 
 
 
 
 
 
724		default:
725			goto error;
726		}
727		break;
728	default:
729error:
730		/* "stall" on error */
731		retval = -EPIPE;
732	}
733	spin_unlock_irqrestore(&xhci->lock, flags);
734	return retval;
735}
736
737/*
738 * Returns 0 if the status hasn't changed, or the number of bytes in buf.
739 * Ports are 0-indexed from the HCD point of view,
740 * and 1-indexed from the USB core pointer of view.
741 *
742 * Note that the status change bits will be cleared as soon as a port status
743 * change event is generated, so we use the saved status from that event.
744 */
745int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
746{
747	unsigned long flags;
748	u32 temp, status;
749	u32 mask;
750	int i, retval;
751	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
752	int max_ports;
753	__le32 __iomem **port_array;
754	struct xhci_bus_state *bus_state;
 
755
756	max_ports = xhci_get_ports(hcd, &port_array);
757	bus_state = &xhci->bus_state[hcd_index(hcd)];
758
759	/* Initial status is no changes */
760	retval = (max_ports + 8) / 8;
761	memset(buf, 0, retval);
762	status = 0;
763
764	mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC;
 
 
 
 
 
 
765
766	spin_lock_irqsave(&xhci->lock, flags);
767	/* For each port, did anything change?  If so, set that bit in buf. */
768	for (i = 0; i < max_ports; i++) {
769		temp = xhci_readl(xhci, port_array[i]);
770		if (temp == 0xffffffff) {
771			retval = -ENODEV;
772			break;
773		}
774		if ((temp & mask) != 0 ||
775			(bus_state->port_c_suspend & 1 << i) ||
776			(bus_state->resume_done[i] && time_after_eq(
777			    jiffies, bus_state->resume_done[i]))) {
778			buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
779			status = 1;
780		}
 
 
 
 
 
 
781	}
782	spin_unlock_irqrestore(&xhci->lock, flags);
783	return status ? retval : 0;
784}
785
786#ifdef CONFIG_PM
787
788int xhci_bus_suspend(struct usb_hcd *hcd)
789{
790	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
791	int max_ports, port_index;
792	__le32 __iomem **port_array;
793	struct xhci_bus_state *bus_state;
794	unsigned long flags;
795
796	max_ports = xhci_get_ports(hcd, &port_array);
797	bus_state = &xhci->bus_state[hcd_index(hcd)];
798
799	spin_lock_irqsave(&xhci->lock, flags);
800
801	if (hcd->self.root_hub->do_remote_wakeup) {
802		port_index = max_ports;
803		while (port_index--) {
804			if (bus_state->resume_done[port_index] != 0) {
805				spin_unlock_irqrestore(&xhci->lock, flags);
806				xhci_dbg(xhci, "suspend failed because "
807						"port %d is resuming\n",
808						port_index + 1);
809				return -EBUSY;
810			}
811		}
812	}
813
814	port_index = max_ports;
815	bus_state->bus_suspended = 0;
816	while (port_index--) {
817		/* suspend the port if the port is not suspended */
818		u32 t1, t2;
819		int slot_id;
820
821		t1 = xhci_readl(xhci, port_array[port_index]);
822		t2 = xhci_port_state_to_neutral(t1);
823
824		if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
825			xhci_dbg(xhci, "port %d not suspended\n", port_index);
826			slot_id = xhci_find_slot_id_by_port(hcd, xhci,
827					port_index + 1);
828			if (slot_id) {
829				spin_unlock_irqrestore(&xhci->lock, flags);
830				xhci_stop_device(xhci, slot_id, 1);
831				spin_lock_irqsave(&xhci->lock, flags);
832			}
833			t2 &= ~PORT_PLS_MASK;
834			t2 |= PORT_LINK_STROBE | XDEV_U3;
835			set_bit(port_index, &bus_state->bus_suspended);
836		}
 
 
 
 
837		if (hcd->self.root_hub->do_remote_wakeup) {
838			if (t1 & PORT_CONNECT) {
839				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
840				t2 &= ~PORT_WKCONN_E;
841			} else {
842				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
843				t2 &= ~PORT_WKDISC_E;
844			}
845		} else
846			t2 &= ~PORT_WAKE_BITS;
847
848		t1 = xhci_port_state_to_neutral(t1);
849		if (t1 != t2)
850			xhci_writel(xhci, t2, port_array[port_index]);
851
852		if (hcd->speed != HCD_USB3) {
853			/* enable remote wake up for USB 2.0 */
854			__le32 __iomem *addr;
855			u32 tmp;
856
857			/* Add one to the port status register address to get
858			 * the port power control register address.
859			 */
860			addr = port_array[port_index] + 1;
861			tmp = xhci_readl(xhci, addr);
862			tmp |= PORT_RWE;
863			xhci_writel(xhci, tmp, addr);
864		}
865	}
866	hcd->state = HC_STATE_SUSPENDED;
867	bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
868	spin_unlock_irqrestore(&xhci->lock, flags);
869	return 0;
870}
871
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
872int xhci_bus_resume(struct usb_hcd *hcd)
873{
874	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
875	int max_ports, port_index;
876	__le32 __iomem **port_array;
877	struct xhci_bus_state *bus_state;
878	u32 temp;
879	unsigned long flags;
 
 
 
 
880
881	max_ports = xhci_get_ports(hcd, &port_array);
882	bus_state = &xhci->bus_state[hcd_index(hcd)];
883
884	if (time_before(jiffies, bus_state->next_statechange))
885		msleep(5);
886
887	spin_lock_irqsave(&xhci->lock, flags);
888	if (!HCD_HW_ACCESSIBLE(hcd)) {
889		spin_unlock_irqrestore(&xhci->lock, flags);
890		return -ESHUTDOWN;
891	}
892
893	/* delay the irqs */
894	temp = xhci_readl(xhci, &xhci->op_regs->command);
895	temp &= ~CMD_EIE;
896	xhci_writel(xhci, temp, &xhci->op_regs->command);
897
898	port_index = max_ports;
899	while (port_index--) {
900		/* Check whether need resume ports. If needed
901		   resume port and disable remote wakeup */
902		u32 temp;
903		int slot_id;
904
905		temp = xhci_readl(xhci, port_array[port_index]);
906		if (DEV_SUPERSPEED(temp))
 
 
 
 
 
 
 
 
907			temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
908		else
909			temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
910		if (test_bit(port_index, &bus_state->bus_suspended) &&
911		    (temp & PORT_PLS_MASK)) {
912			if (DEV_SUPERSPEED(temp)) {
913				temp = xhci_port_state_to_neutral(temp);
914				temp &= ~PORT_PLS_MASK;
915				temp |= PORT_LINK_STROBE | XDEV_U0;
916				xhci_writel(xhci, temp, port_array[port_index]);
917			} else {
918				temp = xhci_port_state_to_neutral(temp);
919				temp &= ~PORT_PLS_MASK;
920				temp |= PORT_LINK_STROBE | XDEV_RESUME;
921				xhci_writel(xhci, temp, port_array[port_index]);
922
923				spin_unlock_irqrestore(&xhci->lock, flags);
924				msleep(20);
925				spin_lock_irqsave(&xhci->lock, flags);
926
927				temp = xhci_readl(xhci, port_array[port_index]);
928				temp = xhci_port_state_to_neutral(temp);
929				temp &= ~PORT_PLS_MASK;
930				temp |= PORT_LINK_STROBE | XDEV_U0;
931				xhci_writel(xhci, temp, port_array[port_index]);
932			}
933			/* wait for the port to enter U0 and report port link
934			 * state change.
935			 */
936			spin_unlock_irqrestore(&xhci->lock, flags);
937			msleep(20);
938			spin_lock_irqsave(&xhci->lock, flags);
939
940			/* Clear PLC */
941			temp = xhci_readl(xhci, port_array[port_index]);
942			if (temp & PORT_PLC) {
943				temp = xhci_port_state_to_neutral(temp);
944				temp |= PORT_PLC;
945				xhci_writel(xhci, temp, port_array[port_index]);
946			}
947
948			slot_id = xhci_find_slot_id_by_port(hcd,
949					xhci, port_index + 1);
950			if (slot_id)
951				xhci_ring_device(xhci, slot_id);
952		} else
953			xhci_writel(xhci, temp, port_array[port_index]);
 
954
955		if (hcd->speed != HCD_USB3) {
956			/* disable remote wake up for USB 2.0 */
957			__le32 __iomem *addr;
958			u32 tmp;
 
959
960			/* Add one to the port status register address to get
961			 * the port power control register address.
962			 */
963			addr = port_array[port_index] + 1;
964			tmp = xhci_readl(xhci, addr);
965			tmp &= ~PORT_RWE;
966			xhci_writel(xhci, tmp, addr);
967		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
968	}
969
970	(void) xhci_readl(xhci, &xhci->op_regs->command);
971
972	bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
973	/* re-enable irqs */
974	temp = xhci_readl(xhci, &xhci->op_regs->command);
975	temp |= CMD_EIE;
976	xhci_writel(xhci, temp, &xhci->op_regs->command);
977	temp = xhci_readl(xhci, &xhci->op_regs->command);
978
979	spin_unlock_irqrestore(&xhci->lock, flags);
980	return 0;
981}
982
983#endif	/* CONFIG_PM */