USB: xhci: BIOS handoff and HW initialization.

Add PCI initialization code to take control of the xHCI host controller
away from the BIOS, halt, and reset the host controller.  The xHCI spec
says that BIOSes must give up the host controller within 5 seconds.

Add some host controller glue functions to handle hardware initialization
and memory allocation for the host controller.  The current xHCI
prototypes use PCI interrupts, but the xHCI spec requires MSI-X
interrupts.  Add code to support MSI-X interrupts, but use the PCI
interrupts for now.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
new file mode 100644
index 000000000000..4015082adf60
--- /dev/null
+++ b/drivers/usb/host/xhci-pci.c
@@ -0,0 +1,150 @@
+/*
+ * xHCI host controller driver PCI Bus Glue.
+ *
+ * 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 <linux/pci.h>
+
+#include "xhci.h"
+
+static const char hcd_name[] = "xhci_hcd";
+
+/* called after powerup, by probe or system-pm "wakeup" */
+static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
+{
+        /*
+         * TODO: Implement finding debug ports later.
+         * TODO: see if there are any quirks that need to be added to handle
+         * new extended capabilities.
+         */
+
+        /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
+        if (!pci_set_mwi(pdev))
+                xhci_dbg(xhci, "MWI active\n");
+
+        xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
+        return 0;
+}
+
+/* called during probe() after chip reset completes */
+static int xhci_pci_setup(struct usb_hcd *hcd)
+{
+        struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
+        struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
+        int                     retval;
+
+        xhci->cap_regs = hcd->regs;
+        xhci->op_regs = hcd->regs +
+                HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));
+        xhci->run_regs = hcd->regs +
+                (xhci_readl(xhci, &xhci->cap_regs->run_regs_off) & RTSOFF_MASK);
+        /* Cache read-only capability registers */
+        xhci->hcs_params1 = xhci_readl(xhci, &xhci->cap_regs->hcs_params1);
+        xhci->hcs_params2 = xhci_readl(xhci, &xhci->cap_regs->hcs_params2);
+        xhci->hcs_params3 = xhci_readl(xhci, &xhci->cap_regs->hcs_params3);
+        xhci->hcc_params = xhci_readl(xhci, &xhci->cap_regs->hcc_params);
+        xhci_print_registers(xhci);
+
+        /* Make sure the HC is halted. */
+        retval = xhci_halt(xhci);
+        if (retval)
+                return retval;
+
+        xhci_dbg(xhci, "Resetting HCD\n");
+        /* Reset the internal HC memory state and registers. */
+        retval = xhci_reset(xhci);
+        if (retval)
+                return retval;
+        xhci_dbg(xhci, "Reset complete\n");
+
+        xhci_dbg(xhci, "Calling HCD init\n");
+        /* Initialize HCD and host controller data structures. */
+        retval = xhci_init(hcd);
+        if (retval)
+                return retval;
+        xhci_dbg(xhci, "Called HCD init\n");
+
+        pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
+        xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);
+
+        /* Find any debug ports */
+        return xhci_pci_reinit(xhci, pdev);
+}
+
+static const struct hc_driver xhci_pci_hc_driver = {
+        .description =          hcd_name,
+        .product_desc =         "xHCI Host Controller",
+        .hcd_priv_size =        sizeof(struct xhci_hcd),
+
+        /*
+         * generic hardware linkage
+         */
+        .flags =                HCD_MEMORY | HCD_USB3,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset =                xhci_pci_setup,
+        .start =                xhci_run,
+        /* suspend and resume implemented later */
+        .stop =                 xhci_stop,
+        .shutdown =             xhci_shutdown,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number =     xhci_get_frame,
+
+        /* Implement root hub support later. */
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* PCI driver selection metadata; PCI hotplugging uses this */
+static const struct pci_device_id pci_ids[] = { {
+        /* handle any USB 3.0 xHCI controller */
+        PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
+        .driver_data =  (unsigned long) &xhci_pci_hc_driver,
+        },
+        { /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+/* pci driver glue; this is a "new style" PCI driver module */
+static struct pci_driver xhci_pci_driver = {
+        .name =         (char *) hcd_name,
+        .id_table =     pci_ids,
+
+        .probe =        usb_hcd_pci_probe,
+        .remove =       usb_hcd_pci_remove,
+        /* suspend and resume implemented later */
+
+        .shutdown =     usb_hcd_pci_shutdown,
+};
+
+int xhci_register_pci()
+{
+        return pci_register_driver(&xhci_pci_driver);
+}
+
+void xhci_unregister_pci()
+{
+        pci_unregister_driver(&xhci_pci_driver);
+}