1 files changed, 308 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
new file mode 100644
index 000000000000..eac5b53aa9e7
--- /dev/null
+++ b/drivers/usb/host/xhci-hub.c
@@ -0,0 +1,308 @@
+/*
+ * 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"
+
+static void xhci_hub_descriptor(struct xhci_hcd *xhci,
+                struct usb_hub_descriptor *desc)
+{
+        int ports;
+        u16 temp;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        /* USB 3.0 hubs have a different descriptor, but we fake this for now */
+        desc->bDescriptorType = 0x29;
+        desc->bPwrOn2PwrGood = 10;      /* xhci section 5.4.9 says 20ms max */
+        desc->bHubContrCurrent = 0;
+
+        desc->bNbrPorts = ports;
+        temp = 1 + (ports / 8);
+        desc->bDescLength = 7 + 2 * temp;
+
+        /* Why does core/hcd.h define bitmap?  It's just confusing. */
+        memset(&desc->DeviceRemovable[0], 0, temp);
+        memset(&desc->DeviceRemovable[temp], 0xff, temp);
+
+        /* 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);
+}
+
+static unsigned int xhci_port_speed(unsigned int port_status)
+{
+        if (DEV_LOWSPEED(port_status))
+                return 1 << USB_PORT_FEAT_LOWSPEED;
+        if (DEV_HIGHSPEED(port_status))
+                return 1 << USB_PORT_FEAT_HIGHSPEED;
+        if (DEV_SUPERSPEED(port_status))
+                return 1 << USB_PORT_FEAT_SUPERSPEED;
+        /*
+         * 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_FEAT_*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.
+ */
+static u32 xhci_port_state_to_neutral(u32 state)
+{
+        /* Save read-only status and port state */
+        return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
+}
+
+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, status;
+        int retval = 0;
+        u32 __iomem *addr;
+        char *port_change_bit;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        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:
+                xhci_hub_descriptor(xhci, (struct usb_hub_descriptor *) buf);
+                break;
+        case GetPortStatus:
+                if (!wIndex || wIndex > ports)
+                        goto error;
+                wIndex--;
+                status = 0;
+                addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                xhci_dbg(xhci, "get port status, actual port %d status  = 0x%x\n", wIndex, temp);
+
+                /* wPortChange bits */
+                if (temp & PORT_CSC)
+                        status |= 1 << USB_PORT_FEAT_C_CONNECTION;
+                if (temp & PORT_PEC)
+                        status |= 1 << USB_PORT_FEAT_C_ENABLE;
+                if ((temp & PORT_OCC))
+                        status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
+                /*
+                 * FIXME ignoring suspend, reset, and USB 2.1/3.0 specific
+                 * changes
+                 */
+                if (temp & PORT_CONNECT) {
+                        status |= 1 << USB_PORT_FEAT_CONNECTION;
+                        status |= xhci_port_speed(temp);
+                }
+                if (temp & PORT_PE)
+                        status |= 1 << USB_PORT_FEAT_ENABLE;
+                if (temp & PORT_OC)
+                        status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
+                if (temp & PORT_RESET)
+                        status |= 1 << USB_PORT_FEAT_RESET;
+                if (temp & PORT_POWER)
+                        status |= 1 << USB_PORT_FEAT_POWER;
+                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--;
+                addr = &xhci->op_regs->port_status_base + NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                temp = xhci_port_state_to_neutral(temp);
+                switch (wValue) {
+                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, addr);
+
+                        temp = xhci_readl(xhci, addr);
+                        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, addr);
+
+                        temp = xhci_readl(xhci, addr);
+                        xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
+                        break;
+                default:
+                        goto error;
+                }
+                temp = xhci_readl(xhci, addr); /* unblock any posted writes */
+                break;
+        case ClearPortFeature:
+                if (!wIndex || wIndex > ports)
+                        goto error;
+                wIndex--;
+                addr = &xhci->op_regs->port_status_base +
+                        NUM_PORT_REGS*(wIndex & 0xff);
+                temp = xhci_readl(xhci, addr);
+                temp = xhci_port_state_to_neutral(temp);
+                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;
+                default:
+                        goto error;
+                }
+                /* Change bits are all write 1 to clear */
+                xhci_writel(xhci, temp | status, addr);
+                temp = xhci_readl(xhci, addr);
+                xhci_dbg(xhci, "clear port %s change, actual port %d status  = 0x%x\n",
+                                port_change_bit, wIndex, temp);
+                temp = xhci_readl(xhci, addr); /* unblock any posted writes */
+                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.
+ * xHCI instances can have up to 127 ports, so FIXME if you see more than 15.
+ *
+ * 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;
+        int i, retval;
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+        int ports;
+        u32 __iomem *addr;
+
+        ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+        /* Initial status is no changes */
+        buf[0] = 0;
+        status = 0;
+        if (ports > 7) {
+                buf[1] = 0;
+                retval = 2;
+        } else {
+                retval = 1;
+        }
+
+        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++) {
+                addr = &xhci->op_regs->port_status_base +
+                        NUM_PORT_REGS*i;
+                temp = xhci_readl(xhci, addr);
+                if (temp & (PORT_CSC | PORT_PEC | PORT_OCC)) {
+                        if (i < 7)
+                                buf[0] |= 1 << (i + 1);
+                        else
+                                buf[1] |= 1 << (i - 7);
+                        status = 1;
+                }
+        }
+        spin_unlock_irqrestore(&xhci->lock, flags);
+        return status ? retval : 0;
+}