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linux_dsm_epyc7002/drivers/usb/host/xhci-hub.c
Sarah Sharp 131dec344d USB: Remove bogus USB_PORT_STAT_SUPER_SPEED symbol. 
USB_PORT_STAT_SUPER_SPEED is a made up symbol that the USB core used to
track whether USB ports had a SuperSpeed device attached.  This is a
linux-internal symbol that was used when SuperSpeed and non-SuperSpeed
devices would show up under the same xHCI roothub.  This particular
port status is never returned by external USB 3.0 hubs.  (Instead they
have a USB_PORT_STAT_SPEED_5GBPS that uses a completely different speed
mask.)

Now that the xHCI driver registers two roothubs, USB 3.0 devices will only
show up under USB 3.0 hubs.  Rip out USB_PORT_STAT_SUPER_SPEED and replace
it with calls to hub_is_superspeed().

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
2011-03-13 18:23:50 -07:00

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/*
* xHCI host controller driver
*
* Copyright (C) 2008 Intel Corp.
*
* Author: Sarah Sharp
* Some code borrowed from the Linux EHCI driver.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <asm/unaligned.h>
#include "xhci.h"
#define PORT_WAKE_BITS (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
#define PORT_RWC_BITS (PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
PORT_RC | PORT_PLC | PORT_PE)
static void xhci_common_hub_descriptor(struct xhci_hcd *xhci,
struct usb_hub_descriptor *desc, int ports)
{
u16 temp;
desc->bPwrOn2PwrGood = 10; /* xhci section 5.4.9 says 20ms max */
desc->bHubContrCurrent = 0;
desc->bNbrPorts = ports;
/* Ugh, these should be #defines, FIXME */
/* Using table 11-13 in USB 2.0 spec. */
temp = 0;
/* Bits 1:0 - support port power switching, or power always on */
if (HCC_PPC(xhci->hcc_params))
temp |= 0x0001;
else
temp |= 0x0002;
/* Bit 2 - root hubs are not part of a compound device */
/* Bits 4:3 - individual port over current protection */
temp |= 0x0008;
/* Bits 6:5 - no TTs in root ports */
/* Bit 7 - no port indicators */
desc->wHubCharacteristics = (__force __u16) cpu_to_le16(temp);
}
/* Fill in the USB 2.0 roothub descriptor */
static void xhci_usb2_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
struct usb_hub_descriptor *desc)
{
int ports;
u16 temp;
__u8 port_removable[(USB_MAXCHILDREN + 1 + 7) / 8];
u32 portsc;
unsigned int i;
ports = xhci->num_usb2_ports;
xhci_common_hub_descriptor(xhci, desc, ports);
desc->bDescriptorType = 0x29;
temp = 1 + (ports / 8);
desc->bDescLength = 7 + 2 * temp;
/* The Device Removable bits are reported on a byte granularity.
* If the port doesn't exist within that byte, the bit is set to 0.
*/
memset(port_removable, 0, sizeof(port_removable));
for (i = 0; i < ports; i++) {
portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
/* If a device is removable, PORTSC reports a 0, same as in the
* hub descriptor DeviceRemovable bits.
*/
if (portsc & PORT_DEV_REMOVE)
/* This math is hairy because bit 0 of DeviceRemovable
* is reserved, and bit 1 is for port 1, etc.
*/
port_removable[(i + 1) / 8] |= 1 << ((i + 1) % 8);
}
/* ch11.h defines a hub descriptor that has room for USB_MAXCHILDREN
* ports on it. The USB 2.0 specification says that there are two
* variable length fields at the end of the hub descriptor:
* DeviceRemovable and PortPwrCtrlMask. But since we can have less than
* USB_MAXCHILDREN ports, we may need to use the DeviceRemovable array
* to set PortPwrCtrlMask bits. PortPwrCtrlMask must always be set to
* 0xFF, so we initialize the both arrays (DeviceRemovable and
* PortPwrCtrlMask) to 0xFF. Then we set the DeviceRemovable for each
* set of ports that actually exist.
*/
memset(desc->u.hs.DeviceRemovable, 0xff,
sizeof(desc->u.hs.DeviceRemovable));
memset(desc->u.hs.PortPwrCtrlMask, 0xff,
sizeof(desc->u.hs.PortPwrCtrlMask));
for (i = 0; i < (ports + 1 + 7) / 8; i++)
memset(&desc->u.hs.DeviceRemovable[i], port_removable[i],
sizeof(__u8));
}
/* Fill in the USB 3.0 roothub descriptor */
static void xhci_usb3_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
struct usb_hub_descriptor *desc)
{
int ports;
u16 port_removable;
u32 portsc;
unsigned int i;
ports = xhci->num_usb3_ports;
xhci_common_hub_descriptor(xhci, desc, ports);
desc->bDescriptorType = 0x2a;
desc->bDescLength = 12;
/* header decode latency should be zero for roothubs,
* see section 4.23.5.2.
*/
desc->u.ss.bHubHdrDecLat = 0;
desc->u.ss.wHubDelay = 0;
port_removable = 0;
/* bit 0 is reserved, bit 1 is for port 1, etc. */
for (i = 0; i < ports; i++) {
portsc = xhci_readl(xhci, xhci->usb3_ports[i]);
if (portsc & PORT_DEV_REMOVE)
port_removable |= 1 << (i + 1);
}
memset(&desc->u.ss.DeviceRemovable,
(__force __u16) cpu_to_le16(port_removable),
sizeof(__u16));
}
static void xhci_hub_descriptor(struct usb_hcd *hcd, struct xhci_hcd *xhci,
struct usb_hub_descriptor *desc)
{
if (hcd->speed == HCD_USB3)
xhci_usb3_hub_descriptor(hcd, xhci, desc);
else
xhci_usb2_hub_descriptor(hcd, xhci, desc);
}
static unsigned int xhci_port_speed(unsigned int port_status)
{
if (DEV_LOWSPEED(port_status))
return USB_PORT_STAT_LOW_SPEED;
if (DEV_HIGHSPEED(port_status))
return USB_PORT_STAT_HIGH_SPEED;
/*
* FIXME: Yes, we should check for full speed, but the core uses that as
* a default in portspeed() in usb/core/hub.c (which is the only place
* USB_PORT_STAT_*_SPEED is used).
*/
return 0;
}
/*
* These bits are Read Only (RO) and should be saved and written to the
* registers: 0, 3, 10:13, 30
* connect status, over-current status, port speed, and device removable.
* connect status and port speed are also sticky - meaning they're in
* the AUX well and they aren't changed by a hot, warm, or cold reset.
*/
#define XHCI_PORT_RO ((1<<0) | (1<<3) | (0xf<<10) | (1<<30))
/*
* These bits are RW; writing a 0 clears the bit, writing a 1 sets the bit:
* bits 5:8, 9, 14:15, 25:27
* link state, port power, port indicator state, "wake on" enable state
*/
#define XHCI_PORT_RWS ((0xf<<5) | (1<<9) | (0x3<<14) | (0x7<<25))
/*
* These bits are RW; writing a 1 sets the bit, writing a 0 has no effect:
* bit 4 (port reset)
*/
#define XHCI_PORT_RW1S ((1<<4))
/*
* These bits are RW; writing a 1 clears the bit, writing a 0 has no effect:
* bits 1, 17, 18, 19, 20, 21, 22, 23
* port enable/disable, and
* change bits: connect, PED, warm port reset changed (reserved zero for USB 2.0 ports),
* over-current, reset, link state, and L1 change
*/
#define XHCI_PORT_RW1CS ((1<<1) | (0x7f<<17))
/*
* Bit 16 is RW, and writing a '1' to it causes the link state control to be
* latched in
*/
#define XHCI_PORT_RW ((1<<16))
/*
* These bits are Reserved Zero (RsvdZ) and zero should be written to them:
* bits 2, 24, 28:31
*/
#define XHCI_PORT_RZ ((1<<2) | (1<<24) | (0xf<<28))
/*
* Given a port state, this function returns a value that would result in the
* port being in the same state, if the value was written to the port status
* control register.
* Save Read Only (RO) bits and save read/write bits where
* writing a 0 clears the bit and writing a 1 sets the bit (RWS).
* For all other types (RW1S, RW1CS, RW, and RZ), writing a '0' has no effect.
*/
u32 xhci_port_state_to_neutral(u32 state)
{
/* Save read-only status and port state */
return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
}
/*
* find slot id based on port number.
* @port: The one-based port number from one of the two split roothubs.
*/
int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
u16 port)
{
int slot_id;
int i;
enum usb_device_speed speed;
slot_id = 0;
for (i = 0; i < MAX_HC_SLOTS; i++) {
if (!xhci->devs[i])
continue;
speed = xhci->devs[i]->udev->speed;
if (((speed == USB_SPEED_SUPER) == (hcd->speed == HCD_USB3))
&& xhci->devs[i]->port == port) {
slot_id = i;
break;
}
}
return slot_id;
}
/*
* Stop device
* It issues stop endpoint command for EP 0 to 30. And wait the last command
* to complete.
* suspend will set to 1, if suspend bit need to set in command.
*/
static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
{
struct xhci_virt_device *virt_dev;
struct xhci_command *cmd;
unsigned long flags;
int timeleft;
int ret;
int i;
ret = 0;
virt_dev = xhci->devs[slot_id];
cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
if (!cmd) {
xhci_dbg(xhci, "Couldn't allocate command structure.\n");
return -ENOMEM;
}
spin_lock_irqsave(&xhci->lock, flags);
for (i = LAST_EP_INDEX; i > 0; i--) {
if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
}
cmd->command_trb = xhci->cmd_ring->enqueue;
list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
xhci_ring_cmd_db(xhci);
spin_unlock_irqrestore(&xhci->lock, flags);
/* Wait for last stop endpoint command to finish */
timeleft = wait_for_completion_interruptible_timeout(
cmd->completion,
USB_CTRL_SET_TIMEOUT);
if (timeleft <= 0) {
xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
timeleft == 0 ? "Timeout" : "Signal");
spin_lock_irqsave(&xhci->lock, flags);
/* The timeout might have raced with the event ring handler, so
* only delete from the list if the item isn't poisoned.
*/
if (cmd->cmd_list.next != LIST_POISON1)
list_del(&cmd->cmd_list);
spin_unlock_irqrestore(&xhci->lock, flags);
ret = -ETIME;
goto command_cleanup;
}
command_cleanup:
xhci_free_command(xhci, cmd);
return ret;
}
/*
* Ring device, it rings the all doorbells unconditionally.
*/
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
{
int i;
for (i = 0; i < LAST_EP_INDEX + 1; i++)
if (xhci->devs[slot_id]->eps[i].ring &&
xhci->devs[slot_id]->eps[i].ring->dequeue)
xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
return;
}
static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
u16 wIndex, u32 __iomem *addr, u32 port_status)
{
/* Don't allow the USB core to disable SuperSpeed ports. */
if (hcd->speed == HCD_USB3) {
xhci_dbg(xhci, "Ignoring request to disable "
"SuperSpeed port.\n");
return;
}
/* Write 1 to disable the port */
xhci_writel(xhci, port_status | PORT_PE, addr);
port_status = xhci_readl(xhci, addr);
xhci_dbg(xhci, "disable port, actual port %d status = 0x%x\n",
wIndex, port_status);
}
static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
u16 wIndex, u32 __iomem *addr, u32 port_status)
{
char *port_change_bit;
u32 status;
switch (wValue) {
case USB_PORT_FEAT_C_RESET:
status = PORT_RC;
port_change_bit = "reset";
break;
case USB_PORT_FEAT_C_CONNECTION:
status = PORT_CSC;
port_change_bit = "connect";
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
status = PORT_OCC;
port_change_bit = "over-current";
break;
case USB_PORT_FEAT_C_ENABLE:
status = PORT_PEC;
port_change_bit = "enable/disable";
break;
case USB_PORT_FEAT_C_SUSPEND:
status = PORT_PLC;
port_change_bit = "suspend/resume";
break;
default:
/* Should never happen */
return;
}
/* Change bits are all write 1 to clear */
xhci_writel(xhci, port_status | status, addr);
port_status = xhci_readl(xhci, addr);
xhci_dbg(xhci, "clear port %s change, actual port %d status = 0x%x\n",
port_change_bit, wIndex, port_status);
}
int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ports;
unsigned long flags;
u32 temp, temp1, status;
int retval = 0;
u32 __iomem **port_array;
int slot_id;
struct xhci_bus_state *bus_state;
if (hcd->speed == HCD_USB3) {
ports = xhci->num_usb3_ports;
port_array = xhci->usb3_ports;
} else {
ports = xhci->num_usb2_ports;
port_array = xhci->usb2_ports;
}
bus_state = &xhci->bus_state[hcd_index(hcd)];
spin_lock_irqsave(&xhci->lock, flags);
switch (typeReq) {
case GetHubStatus:
/* No power source, over-current reported per port */
memset(buf, 0, 4);
break;
case GetHubDescriptor:
/* Check to make sure userspace is asking for the USB 3.0 hub
* descriptor for the USB 3.0 roothub. If not, we stall the
* endpoint, like external hubs do.
*/
if (hcd->speed == HCD_USB3 &&
(wLength < USB_DT_SS_HUB_SIZE ||
wValue != (USB_DT_SS_HUB << 8))) {
xhci_dbg(xhci, "Wrong hub descriptor type for "
"USB 3.0 roothub.\n");
goto error;
}
xhci_hub_descriptor(hcd, xhci,
(struct usb_hub_descriptor *) buf);
break;
case GetPortStatus:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
status = 0;
temp = xhci_readl(xhci, port_array[wIndex]);
if (temp == 0xffffffff) {
retval = -ENODEV;
break;
}
xhci_dbg(xhci, "get port status, actual port %d status = 0x%x\n", wIndex, temp);
/* FIXME - should we return a port status value like the USB
* 3.0 external hubs do?
*/
/* wPortChange bits */
if (temp & PORT_CSC)
status |= USB_PORT_STAT_C_CONNECTION << 16;
if (temp & PORT_PEC)
status |= USB_PORT_STAT_C_ENABLE << 16;
if ((temp & PORT_OCC))
status |= USB_PORT_STAT_C_OVERCURRENT << 16;
/*
* FIXME ignoring reset and USB 2.1/3.0 specific
* changes
*/
if ((temp & PORT_PLS_MASK) == XDEV_U3
&& (temp & PORT_POWER))
status |= 1 << USB_PORT_FEAT_SUSPEND;
if ((temp & PORT_PLS_MASK) == XDEV_RESUME) {
if ((temp & PORT_RESET) || !(temp & PORT_PE))
goto error;
if (!DEV_SUPERSPEED(temp) && time_after_eq(jiffies,
bus_state->resume_done[wIndex])) {
xhci_dbg(xhci, "Resume USB2 port %d\n",
wIndex + 1);
bus_state->resume_done[wIndex] = 0;
temp1 = xhci_port_state_to_neutral(temp);
temp1 &= ~PORT_PLS_MASK;
temp1 |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp1, port_array[wIndex]);
xhci_dbg(xhci, "set port %d resume\n",
wIndex + 1);
slot_id = xhci_find_slot_id_by_port(hcd, xhci,
wIndex + 1);
if (!slot_id) {
xhci_dbg(xhci, "slot_id is zero\n");
goto error;
}
xhci_ring_device(xhci, slot_id);
bus_state->port_c_suspend |= 1 << wIndex;
bus_state->suspended_ports &= ~(1 << wIndex);
}
}
if ((temp & PORT_PLS_MASK) == XDEV_U0
&& (temp & PORT_POWER)
&& (bus_state->suspended_ports & (1 << wIndex))) {
bus_state->suspended_ports &= ~(1 << wIndex);
bus_state->port_c_suspend |= 1 << wIndex;
}
if (temp & PORT_CONNECT) {
status |= USB_PORT_STAT_CONNECTION;
status |= xhci_port_speed(temp);
}
if (temp & PORT_PE)
status |= USB_PORT_STAT_ENABLE;
if (temp & PORT_OC)
status |= USB_PORT_STAT_OVERCURRENT;
if (temp & PORT_RESET)
status |= USB_PORT_STAT_RESET;
if (temp & PORT_POWER)
status |= USB_PORT_STAT_POWER;
if (bus_state->port_c_suspend & (1 << wIndex))
status |= 1 << USB_PORT_FEAT_C_SUSPEND;
xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
put_unaligned(cpu_to_le32(status), (__le32 *) buf);
break;
case SetPortFeature:
wIndex &= 0xff;
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = xhci_readl(xhci, port_array[wIndex]);
if (temp == 0xffffffff) {
retval = -ENODEV;
break;
}
temp = xhci_port_state_to_neutral(temp);
/* FIXME: What new port features do we need to support? */
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
temp = xhci_readl(xhci, port_array[wIndex]);
/* In spec software should not attempt to suspend
* a port unless the port reports that it is in the
* enabled (PED = ‘1’,PLS < ‘3’) state.
*/
if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
|| (temp & PORT_PLS_MASK) >= XDEV_U3) {
xhci_warn(xhci, "USB core suspending device "
"not in U0/U1/U2.\n");
goto error;
}
slot_id = xhci_find_slot_id_by_port(hcd, xhci,
wIndex + 1);
if (!slot_id) {
xhci_warn(xhci, "slot_id is zero\n");
goto error;
}
/* unlock to execute stop endpoint commands */
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_stop_device(xhci, slot_id, 1);
spin_lock_irqsave(&xhci->lock, flags);
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_U3;
xhci_writel(xhci, temp, port_array[wIndex]);
spin_unlock_irqrestore(&xhci->lock, flags);
msleep(10); /* wait device to enter */
spin_lock_irqsave(&xhci->lock, flags);
temp = xhci_readl(xhci, port_array[wIndex]);
bus_state->suspended_ports |= 1 << wIndex;
break;
case USB_PORT_FEAT_POWER:
/*
* Turn on ports, even if there isn't per-port switching.
* HC will report connect events even before this is set.
* However, khubd will ignore the roothub events until
* the roothub is registered.
*/
xhci_writel(xhci, temp | PORT_POWER,
port_array[wIndex]);
temp = xhci_readl(xhci, port_array[wIndex]);
xhci_dbg(xhci, "set port power, actual port %d status = 0x%x\n", wIndex, temp);
break;
case USB_PORT_FEAT_RESET:
temp = (temp | PORT_RESET);
xhci_writel(xhci, temp, port_array[wIndex]);
temp = xhci_readl(xhci, port_array[wIndex]);
xhci_dbg(xhci, "set port reset, actual port %d status = 0x%x\n", wIndex, temp);
break;
default:
goto error;
}
/* unblock any posted writes */
temp = xhci_readl(xhci, port_array[wIndex]);
break;
case ClearPortFeature:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = xhci_readl(xhci, port_array[wIndex]);
if (temp == 0xffffffff) {
retval = -ENODEV;
break;
}
/* FIXME: What new port features do we need to support? */
temp = xhci_port_state_to_neutral(temp);
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
temp = xhci_readl(xhci, port_array[wIndex]);
xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
xhci_dbg(xhci, "PORTSC %04x\n", temp);
if (temp & PORT_RESET)
goto error;
if (temp & XDEV_U3) {
if ((temp & PORT_PE) == 0)
goto error;
if (DEV_SUPERSPEED(temp)) {
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp,
port_array[wIndex]);
xhci_readl(xhci, port_array[wIndex]);
} else {
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_RESUME;
xhci_writel(xhci, temp,
port_array[wIndex]);
spin_unlock_irqrestore(&xhci->lock,
flags);
msleep(20);
spin_lock_irqsave(&xhci->lock, flags);
temp = xhci_readl(xhci,
port_array[wIndex]);
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp,
port_array[wIndex]);
}
bus_state->port_c_suspend |= 1 << wIndex;
}
slot_id = xhci_find_slot_id_by_port(hcd, xhci,
wIndex + 1);
if (!slot_id) {
xhci_dbg(xhci, "slot_id is zero\n");
goto error;
}
xhci_ring_device(xhci, slot_id);
break;
case USB_PORT_FEAT_C_SUSPEND:
bus_state->port_c_suspend &= ~(1 << wIndex);
case USB_PORT_FEAT_C_RESET:
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_ENABLE:
xhci_clear_port_change_bit(xhci, wValue, wIndex,
port_array[wIndex], temp);
break;
case USB_PORT_FEAT_ENABLE:
xhci_disable_port(hcd, xhci, wIndex,
port_array[wIndex], temp);
break;
default:
goto error;
}
break;
default:
error:
/* "stall" on error */
retval = -EPIPE;
}
spin_unlock_irqrestore(&xhci->lock, flags);
return retval;
}
/*
* Returns 0 if the status hasn't changed, or the number of bytes in buf.
* Ports are 0-indexed from the HCD point of view,
* and 1-indexed from the USB core pointer of view.
*
* Note that the status change bits will be cleared as soon as a port status
* change event is generated, so we use the saved status from that event.
*/
int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
{
unsigned long flags;
u32 temp, status;
u32 mask;
int i, retval;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int ports;
u32 __iomem **port_array;
struct xhci_bus_state *bus_state;
if (hcd->speed == HCD_USB3) {
ports = xhci->num_usb3_ports;
port_array = xhci->usb3_ports;
} else {
ports = xhci->num_usb2_ports;
port_array = xhci->usb2_ports;
}
bus_state = &xhci->bus_state[hcd_index(hcd)];
/* Initial status is no changes */
retval = (ports + 8) / 8;
memset(buf, 0, retval);
status = 0;
mask = PORT_CSC | PORT_PEC | PORT_OCC;
spin_lock_irqsave(&xhci->lock, flags);
/* For each port, did anything change? If so, set that bit in buf. */
for (i = 0; i < ports; i++) {
temp = xhci_readl(xhci, port_array[i]);
if (temp == 0xffffffff) {
retval = -ENODEV;
break;
}
if ((temp & mask) != 0 ||
(bus_state->port_c_suspend & 1 << i) ||
(bus_state->resume_done[i] && time_after_eq(
jiffies, bus_state->resume_done[i]))) {
buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
status = 1;
}
}
spin_unlock_irqrestore(&xhci->lock, flags);
return status ? retval : 0;
}
#ifdef CONFIG_PM
int xhci_bus_suspend(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int max_ports, port_index;
u32 __iomem **port_array;
struct xhci_bus_state *bus_state;
unsigned long flags;
if (hcd->speed == HCD_USB3) {
max_ports = xhci->num_usb3_ports;
port_array = xhci->usb3_ports;
xhci_dbg(xhci, "suspend USB 3.0 root hub\n");
} else {
max_ports = xhci->num_usb2_ports;
port_array = xhci->usb2_ports;
xhci_dbg(xhci, "suspend USB 2.0 root hub\n");
}
bus_state = &xhci->bus_state[hcd_index(hcd)];
spin_lock_irqsave(&xhci->lock, flags);
if (hcd->self.root_hub->do_remote_wakeup) {
port_index = max_ports;
while (port_index--) {
if (bus_state->resume_done[port_index] != 0) {
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_dbg(xhci, "suspend failed because "
"port %d is resuming\n",
port_index + 1);
return -EBUSY;
}
}
}
port_index = max_ports;
bus_state->bus_suspended = 0;
while (port_index--) {
/* suspend the port if the port is not suspended */
u32 t1, t2;
int slot_id;
t1 = xhci_readl(xhci, port_array[port_index]);
t2 = xhci_port_state_to_neutral(t1);
if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
xhci_dbg(xhci, "port %d not suspended\n", port_index);
slot_id = xhci_find_slot_id_by_port(hcd, xhci,
port_index + 1);
if (slot_id) {
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_stop_device(xhci, slot_id, 1);
spin_lock_irqsave(&xhci->lock, flags);
}
t2 &= ~PORT_PLS_MASK;
t2 |= PORT_LINK_STROBE | XDEV_U3;
set_bit(port_index, &bus_state->bus_suspended);
}
if (hcd->self.root_hub->do_remote_wakeup) {
if (t1 & PORT_CONNECT) {
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
t2 &= ~PORT_WKCONN_E;
} else {
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
t2 &= ~PORT_WKDISC_E;
}
} else
t2 &= ~PORT_WAKE_BITS;
t1 = xhci_port_state_to_neutral(t1);
if (t1 != t2)
xhci_writel(xhci, t2, port_array[port_index]);
if (DEV_HIGHSPEED(t1)) {
/* enable remote wake up for USB 2.0 */
u32 __iomem *addr;
u32 tmp;
/* Add one to the port status register address to get
* the port power control register address.
*/
addr = port_array[port_index] + 1;
tmp = xhci_readl(xhci, addr);
tmp |= PORT_RWE;
xhci_writel(xhci, tmp, addr);
}
}
hcd->state = HC_STATE_SUSPENDED;
bus_state->next_statechange = jiffies + msecs_to_jiffies(10);
spin_unlock_irqrestore(&xhci->lock, flags);
return 0;
}
int xhci_bus_resume(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
int max_ports, port_index;
u32 __iomem **port_array;
struct xhci_bus_state *bus_state;
u32 temp;
unsigned long flags;
if (hcd->speed == HCD_USB3) {
max_ports = xhci->num_usb3_ports;
port_array = xhci->usb3_ports;
xhci_dbg(xhci, "resume USB 3.0 root hub\n");
} else {
max_ports = xhci->num_usb2_ports;
port_array = xhci->usb2_ports;
xhci_dbg(xhci, "resume USB 2.0 root hub\n");
}
bus_state = &xhci->bus_state[hcd_index(hcd)];
if (time_before(jiffies, bus_state->next_statechange))
msleep(5);
spin_lock_irqsave(&xhci->lock, flags);
if (!HCD_HW_ACCESSIBLE(hcd)) {
spin_unlock_irqrestore(&xhci->lock, flags);
return -ESHUTDOWN;
}
/* delay the irqs */
temp = xhci_readl(xhci, &xhci->op_regs->command);
temp &= ~CMD_EIE;
xhci_writel(xhci, temp, &xhci->op_regs->command);
port_index = max_ports;
while (port_index--) {
/* Check whether need resume ports. If needed
resume port and disable remote wakeup */
u32 temp;
int slot_id;
temp = xhci_readl(xhci, port_array[port_index]);
if (DEV_SUPERSPEED(temp))
temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
else
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
if (test_bit(port_index, &bus_state->bus_suspended) &&
(temp & PORT_PLS_MASK)) {
if (DEV_SUPERSPEED(temp)) {
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp, port_array[port_index]);
} else {
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_RESUME;
xhci_writel(xhci, temp, port_array[port_index]);
spin_unlock_irqrestore(&xhci->lock, flags);
msleep(20);
spin_lock_irqsave(&xhci->lock, flags);
temp = xhci_readl(xhci, port_array[port_index]);
temp = xhci_port_state_to_neutral(temp);
temp &= ~PORT_PLS_MASK;
temp |= PORT_LINK_STROBE | XDEV_U0;
xhci_writel(xhci, temp, port_array[port_index]);
}
slot_id = xhci_find_slot_id_by_port(hcd,
xhci, port_index + 1);
if (slot_id)
xhci_ring_device(xhci, slot_id);
} else
xhci_writel(xhci, temp, port_array[port_index]);
if (DEV_HIGHSPEED(temp)) {
/* disable remote wake up for USB 2.0 */
u32 __iomem *addr;
u32 tmp;
/* Add one to the port status register address to get
* the port power control register address.
*/
addr = port_array[port_index] + 1;
tmp = xhci_readl(xhci, addr);
tmp &= ~PORT_RWE;
xhci_writel(xhci, tmp, addr);
}
}
(void) xhci_readl(xhci, &xhci->op_regs->command);
bus_state->next_statechange = jiffies + msecs_to_jiffies(5);
/* re-enable irqs */
temp = xhci_readl(xhci, &xhci->op_regs->command);
temp |= CMD_EIE;
xhci_writel(xhci, temp, &xhci->op_regs->command);
temp = xhci_readl(xhci, &xhci->op_regs->command);
spin_unlock_irqrestore(&xhci->lock, flags);
return 0;
}
#endif /* CONFIG_PM */
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