[PATCH] EHCI, split out PCI glue
authorMatt Porter <mporter@kernel.crashing.org>
Fri, 23 Sep 2005 05:31:15 +0000 (22:31 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 28 Oct 2005 23:47:39 +0000 (16:47 -0700)
This splits BIOS and PCI specific support out of ehci-hcd.c into
ehci-pci.c.  It follows the model already used in the OHCI driver
so support for non-PCI EHCI controllers can be more easily added.

Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 drivers/usb/host/ehci-hcd.c |  543 ++++++--------------------------------------
 drivers/usb/host/ehci-pci.c |  414 +++++++++++++++++++++++++++++++++
 drivers/usb/host/ehci.h     |    1
 3 files changed, 492 insertions(+), 466 deletions(-)

drivers/usb/host/ehci-hcd.c
drivers/usb/host/ehci-pci.c [new file with mode: 0644]
drivers/usb/host/ehci.h

index 513fccbb8e432d9ac52253311209a1c16cdeff56..af3c05eb86fcd4ccc24d2908f7d65ca35b3a3570 100644 (file)
@@ -300,44 +300,6 @@ static void ehci_watchdog (unsigned long param)
        spin_unlock_irqrestore (&ehci->lock, flags);
 }
 
-#ifdef CONFIG_PCI
-
-/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
- * off the controller (maybe it can boot from highspeed USB disks).
- */
-static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
-{
-       struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
-
-       /* always say Linux will own the hardware */
-       pci_write_config_byte(pdev, where + 3, 1);
-
-       /* maybe wait a while for BIOS to respond */
-       if (cap & (1 << 16)) {
-               int msec = 5000;
-
-               do {
-                       msleep(10);
-                       msec -= 10;
-                       pci_read_config_dword(pdev, where, &cap);
-               } while ((cap & (1 << 16)) && msec);
-               if (cap & (1 << 16)) {
-                       ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
-                               where, cap);
-                       // some BIOS versions seem buggy...
-                       // return 1;
-                       ehci_warn (ehci, "continuing after BIOS bug...\n");
-                       /* disable all SMIs, and clear "BIOS owns" flag */
-                       pci_write_config_dword(pdev, where + 4, 0);
-                       pci_write_config_byte(pdev, where + 2, 0);
-               } else
-                       ehci_dbg(ehci, "BIOS handoff succeeded\n");
-       }
-       return 0;
-}
-
-#endif
-
 /* Reboot notifiers kick in for silicon on any bus (not just pci, etc).
  * This forcibly disables dma and IRQs, helping kexec and other cases
  * where the next system software may expect clean state.
@@ -371,156 +333,90 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
        msleep(20);
 }
 
+/*-------------------------------------------------------------------------*/
 
-/* called by khubd or root hub init threads */
+/*
+ * ehci_work is called from some interrupts, timers, and so on.
+ * it calls driver completion functions, after dropping ehci->lock.
+ */
+static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs)
+{
+       timer_action_done (ehci, TIMER_IO_WATCHDOG);
+       if (ehci->reclaim_ready)
+               end_unlink_async (ehci, regs);
+
+       /* another CPU may drop ehci->lock during a schedule scan while
+        * it reports urb completions.  this flag guards against bogus
+        * attempts at re-entrant schedule scanning.
+        */
+       if (ehci->scanning)
+               return;
+       ehci->scanning = 1;
+       scan_async (ehci, regs);
+       if (ehci->next_uframe != -1)
+               scan_periodic (ehci, regs);
+       ehci->scanning = 0;
+
+       /* the IO watchdog guards against hardware or driver bugs that
+        * misplace IRQs, and should let us run completely without IRQs.
+        * such lossage has been observed on both VT6202 and VT8235.
+        */
+       if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
+                       (ehci->async->qh_next.ptr != NULL ||
+                        ehci->periodic_sched != 0))
+               timer_action (ehci, TIMER_IO_WATCHDOG);
+}
 
-static int ehci_hc_reset (struct usb_hcd *hcd)
+static void ehci_stop (struct usb_hcd *hcd)
 {
        struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-       u32                     temp;
-       unsigned                count = 256/4;
 
-       spin_lock_init (&ehci->lock);
+       ehci_dbg (ehci, "stop\n");
 
-       ehci->caps = hcd->regs;
-       ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase));
-       dbg_hcs_params (ehci, "reset");
-       dbg_hcc_params (ehci, "reset");
+       /* Turn off port power on all root hub ports. */
+       ehci_port_power (ehci, 0);
 
-       /* cache this readonly data; minimize chip reads */
-       ehci->hcs_params = readl (&ehci->caps->hcs_params);
+       /* no more interrupts ... */
+       del_timer_sync (&ehci->watchdog);
 
-#ifdef CONFIG_PCI
-       if (hcd->self.controller->bus == &pci_bus_type) {
-               struct pci_dev  *pdev = to_pci_dev(hcd->self.controller);
+       spin_lock_irq(&ehci->lock);
+       if (HC_IS_RUNNING (hcd->state))
+               ehci_quiesce (ehci);
 
-               switch (pdev->vendor) {
-               case PCI_VENDOR_ID_TDI:
-                       if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
-                               ehci->is_tdi_rh_tt = 1;
-                               tdi_reset (ehci);
-                       }
-                       break;
-               case PCI_VENDOR_ID_AMD:
-                       /* AMD8111 EHCI doesn't work, according to AMD errata */
-                       if (pdev->device == 0x7463) {
-                               ehci_info (ehci, "ignoring AMD8111 (errata)\n");
-                               return -EIO;
-                       }
-                       break;
-               case PCI_VENDOR_ID_NVIDIA:
-                       /* NVidia reports that certain chips don't handle
-                        * QH, ITD, or SITD addresses above 2GB.  (But TD,
-                        * data buffer, and periodic schedule are normal.)
-                        */
-                       switch (pdev->device) {
-                       case 0x003c:    /* MCP04 */
-                       case 0x005b:    /* CK804 */
-                       case 0x00d8:    /* CK8 */
-                       case 0x00e8:    /* CK8S */
-                               if (pci_set_consistent_dma_mask(pdev,
-                                                       DMA_31BIT_MASK) < 0)
-                                       ehci_warn (ehci, "can't enable NVidia "
-                                               "workaround for >2GB RAM\n");
-                               break;
-                       }
-                       break;
-               }
+       ehci_reset (ehci);
+       writel (0, &ehci->regs->intr_enable);
+       spin_unlock_irq(&ehci->lock);
 
-               /* optional debug port, normally in the first BAR */
-               temp = pci_find_capability (pdev, 0x0a);
-               if (temp) {
-                       pci_read_config_dword(pdev, temp, &temp);
-                       temp >>= 16;
-                       if ((temp & (3 << 13)) == (1 << 13)) {
-                               temp &= 0x1fff;
-                               ehci->debug = hcd->regs + temp;
-                               temp = readl (&ehci->debug->control);
-                               ehci_info (ehci, "debug port %d%s\n",
-                                       HCS_DEBUG_PORT(ehci->hcs_params),
-                                       (temp & DBGP_ENABLED)
-                                               ? " IN USE"
-                                               : "");
-                               if (!(temp & DBGP_ENABLED))
-                                       ehci->debug = NULL;
-                       }
-               }
+       /* let companion controllers work when we aren't */
+       writel (0, &ehci->regs->configured_flag);
+       unregister_reboot_notifier (&ehci->reboot_notifier);
 
-               temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
-       } else
-               temp = 0;
-
-       /* EHCI 0.96 and later may have "extended capabilities" */
-       while (temp && count--) {
-               u32             cap;
-
-               pci_read_config_dword (to_pci_dev(hcd->self.controller),
-                               temp, &cap);
-               ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp);
-               switch (cap & 0xff) {
-               case 1:                 /* BIOS/SMM/... handoff */
-                       if (bios_handoff (ehci, temp, cap) != 0)
-                               return -EOPNOTSUPP;
-                       break;
-               case 0:                 /* illegal reserved capability */
-                       ehci_warn (ehci, "illegal capability!\n");
-                       cap = 0;
-                       /* FALLTHROUGH */
-               default:                /* unknown */
-                       break;
-               }
-               temp = (cap >> 8) & 0xff;
-       }
-       if (!count) {
-               ehci_err (ehci, "bogus capabilities ... PCI problems!\n");
-               return -EIO;
-       }
-       if (ehci_is_TDI(ehci))
-               ehci_reset (ehci);
-#endif
+       remove_debug_files (ehci);
 
-       ehci_port_power (ehci, 0);
+       /* root hub is shut down separately (first, when possible) */
+       spin_lock_irq (&ehci->lock);
+       if (ehci->async)
+               ehci_work (ehci, NULL);
+       spin_unlock_irq (&ehci->lock);
+       ehci_mem_cleanup (ehci);
 
-       /* at least the Genesys GL880S needs fixup here */
-       temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
-       temp &= 0x0f;
-       if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
-               ehci_dbg (ehci, "bogus port configuration: "
-                       "cc=%d x pcc=%d < ports=%d\n",
-                       HCS_N_CC(ehci->hcs_params),
-                       HCS_N_PCC(ehci->hcs_params),
-                       HCS_N_PORTS(ehci->hcs_params));
-
-#ifdef CONFIG_PCI
-               if (hcd->self.controller->bus == &pci_bus_type) {
-                       struct pci_dev  *pdev;
-
-                       pdev = to_pci_dev(hcd->self.controller);
-                       switch (pdev->vendor) {
-                       case 0x17a0:            /* GENESYS */
-                               /* GL880S: should be PORTS=2 */
-                               temp |= (ehci->hcs_params & ~0xf);
-                               ehci->hcs_params = temp;
-                               break;
-                       case PCI_VENDOR_ID_NVIDIA:
-                               /* NF4: should be PCC=10 */
-                               break;
-                       }
-               }
+#ifdef EHCI_STATS
+       ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
+               ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+               ehci->stats.lost_iaa);
+       ehci_dbg (ehci, "complete %ld unlink %ld\n",
+               ehci->stats.complete, ehci->stats.unlink);
 #endif
-       }
 
-       /* force HC to halt state */
-       return ehci_halt (ehci);
+       dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
 }
 
-static int ehci_start (struct usb_hcd *hcd)
+static int ehci_run (struct usb_hcd *hcd)
 {
        struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
        u32                     temp;
        int                     retval;
        u32                     hcc_params;
-       u8                      sbrn = 0;
        int                     first;
 
        /* skip some things on restart paths */
@@ -559,27 +455,6 @@ static int ehci_start (struct usb_hcd *hcd)
        }
        writel (ehci->periodic_dma, &ehci->regs->frame_list);
 
-#ifdef CONFIG_PCI
-       if (hcd->self.controller->bus == &pci_bus_type) {
-               struct pci_dev          *pdev;
-               u16                     port_wake;
-
-               pdev = to_pci_dev(hcd->self.controller);
-
-               /* Serial Bus Release Number is at PCI 0x60 offset */
-               pci_read_config_byte(pdev, 0x60, &sbrn);
-
-               /* port wake capability, reported by boot firmware */
-               pci_read_config_word(pdev, 0x62, &port_wake);
-               hcd->can_wakeup = (port_wake & 1) != 0;
-
-               /* help hc dma work well with cachelines */
-               retval = pci_set_mwi(pdev);
-               if (retval)
-                       ehci_dbg(ehci, "unable to enable MWI - not fatal.\n");
-       }
-#endif
-
        /*
         * dedicate a qh for the async ring head, since we couldn't unlink
         * a 'real' qh without stopping the async schedule [4.8].  use it
@@ -675,7 +550,7 @@ static int ehci_start (struct usb_hcd *hcd)
        temp = HC_VERSION(readl (&ehci->caps->hc_capbase));
        ehci_info (ehci,
                "USB %x.%x %s, EHCI %x.%02x, driver %s\n",
-               ((sbrn & 0xf0)>>4), (sbrn & 0x0f),
+               ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f),
                first ? "initialized" : "restarted",
                temp >> 8, temp & 0xff, DRIVER_VERSION);
 
@@ -687,188 +562,6 @@ static int ehci_start (struct usb_hcd *hcd)
        return 0;
 }
 
-/* always called by thread; normally rmmod */
-
-static void ehci_stop (struct usb_hcd *hcd)
-{
-       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-
-       ehci_dbg (ehci, "stop\n");
-
-       /* Turn off port power on all root hub ports. */
-       ehci_port_power (ehci, 0);
-
-       /* no more interrupts ... */
-       del_timer_sync (&ehci->watchdog);
-
-       spin_lock_irq(&ehci->lock);
-       if (HC_IS_RUNNING (hcd->state))
-               ehci_quiesce (ehci);
-
-       ehci_reset (ehci);
-       writel (0, &ehci->regs->intr_enable);
-       spin_unlock_irq(&ehci->lock);
-
-       /* let companion controllers work when we aren't */
-       writel (0, &ehci->regs->configured_flag);
-       unregister_reboot_notifier (&ehci->reboot_notifier);
-
-       remove_debug_files (ehci);
-
-       /* root hub is shut down separately (first, when possible) */
-       spin_lock_irq (&ehci->lock);
-       if (ehci->async)
-               ehci_work (ehci, NULL);
-       spin_unlock_irq (&ehci->lock);
-       ehci_mem_cleanup (ehci);
-
-#ifdef EHCI_STATS
-       ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
-               ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
-               ehci->stats.lost_iaa);
-       ehci_dbg (ehci, "complete %ld unlink %ld\n",
-               ehci->stats.complete, ehci->stats.unlink);
-#endif
-
-       dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status));
-}
-
-static int ehci_get_frame (struct usb_hcd *hcd)
-{
-       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-       return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
-}
-
-/*-------------------------------------------------------------------------*/
-
-#ifdef CONFIG_PM
-
-/* suspend/resume, section 4.3 */
-
-/* These routines rely on the bus (pci, platform, etc)
- * to handle powerdown and wakeup, and currently also on
- * transceivers that don't need any software attention to set up
- * the right sort of wakeup.  
- */
-
-static int ehci_suspend (struct usb_hcd *hcd, pm_message_t message)
-{
-       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-
-       if (time_before (jiffies, ehci->next_statechange))
-               msleep (100);
-
-#ifdef CONFIG_USB_SUSPEND
-       (void) usb_suspend_device (hcd->self.root_hub);
-#else
-       usb_lock_device (hcd->self.root_hub);
-       (void) ehci_hub_suspend (hcd);
-       usb_unlock_device (hcd->self.root_hub);
-#endif
-
-       // save (PCI) FLADJ in case of Vaux power loss
-       // ... we'd only use it to handle clock skew
-
-       return 0;
-}
-
-static int ehci_resume (struct usb_hcd *hcd)
-{
-       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
-       unsigned                port;
-       struct usb_device       *root = hcd->self.root_hub;
-       int                     retval = -EINVAL;
-
-       // maybe restore (PCI) FLADJ
-
-       if (time_before (jiffies, ehci->next_statechange))
-               msleep (100);
-
-       /* If any port is suspended (or owned by the companion),
-        * we know we can/must resume the HC (and mustn't reset it).
-        */
-       for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
-               u32     status;
-               port--;
-               status = readl (&ehci->regs->port_status [port]);
-               if (!(status & PORT_POWER))
-                       continue;
-               if (status & (PORT_SUSPEND | PORT_OWNER)) {
-                       down (&hcd->self.root_hub->serialize);
-                       retval = ehci_hub_resume (hcd);
-                       up (&hcd->self.root_hub->serialize);
-                       break;
-               }
-               if (!root->children [port])
-                       continue;
-               dbg_port (ehci, __FUNCTION__, port + 1, status);
-               usb_set_device_state (root->children[port],
-                                       USB_STATE_NOTATTACHED);
-       }
-
-       /* Else reset, to cope with power loss or flush-to-storage
-        * style "resume" having activated BIOS during reboot.
-        */
-       if (port == 0) {
-               (void) ehci_halt (ehci);
-               (void) ehci_reset (ehci);
-               (void) ehci_hc_reset (hcd);
-
-               /* emptying the schedule aborts any urbs */
-               spin_lock_irq (&ehci->lock);
-               if (ehci->reclaim)
-                       ehci->reclaim_ready = 1;
-               ehci_work (ehci, NULL);
-               spin_unlock_irq (&ehci->lock);
-
-               /* restart; khubd will disconnect devices */
-               retval = ehci_start (hcd);
-
-               /* here we "know" root ports should always stay powered;
-                * but some controllers may lose all power.
-                */
-               ehci_port_power (ehci, 1);
-       }
-
-       return retval;
-}
-
-#endif
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * ehci_work is called from some interrupts, timers, and so on.
- * it calls driver completion functions, after dropping ehci->lock.
- */
-static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs)
-{
-       timer_action_done (ehci, TIMER_IO_WATCHDOG);
-       if (ehci->reclaim_ready)
-               end_unlink_async (ehci, regs);
-
-       /* another CPU may drop ehci->lock during a schedule scan while
-        * it reports urb completions.  this flag guards against bogus
-        * attempts at re-entrant schedule scanning.
-        */
-       if (ehci->scanning)
-               return;
-       ehci->scanning = 1;
-       scan_async (ehci, regs);
-       if (ehci->next_uframe != -1)
-               scan_periodic (ehci, regs);
-       ehci->scanning = 0;
-
-       /* the IO watchdog guards against hardware or driver bugs that
-        * misplace IRQs, and should let us run completely without IRQs.
-        * such lossage has been observed on both VT6202 and VT8235. 
-        */
-       if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
-                       (ehci->async->qh_next.ptr != NULL ||
-                        ehci->periodic_sched != 0))
-               timer_action (ehci, TIMER_IO_WATCHDOG);
-}
-
 /*-------------------------------------------------------------------------*/
 
 static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs)
@@ -1179,106 +872,24 @@ done:
        return;
 }
 
-/*-------------------------------------------------------------------------*/
-
-static const struct hc_driver ehci_driver = {
-       .description =          hcd_name,
-       .product_desc =         "EHCI Host Controller",
-       .hcd_priv_size =        sizeof(struct ehci_hcd),
-
-       /*
-        * generic hardware linkage
-        */
-       .irq =                  ehci_irq,
-       .flags =                HCD_MEMORY | HCD_USB2,
-
-       /*
-        * basic lifecycle operations
-        */
-       .reset =                ehci_hc_reset,
-       .start =                ehci_start,
-#ifdef CONFIG_PM
-       .suspend =              ehci_suspend,
-       .resume =               ehci_resume,
-#endif
-       .stop =                 ehci_stop,
-
-       /*
-        * managing i/o requests and associated device resources
-        */
-       .urb_enqueue =          ehci_urb_enqueue,
-       .urb_dequeue =          ehci_urb_dequeue,
-       .endpoint_disable =     ehci_endpoint_disable,
-
-       /*
-        * scheduling support
-        */
-       .get_frame_number =     ehci_get_frame,
-
-       /*
-        * root hub support
-        */
-       .hub_status_data =      ehci_hub_status_data,
-       .hub_control =          ehci_hub_control,
-       .hub_suspend =          ehci_hub_suspend,
-       .hub_resume =           ehci_hub_resume,
-};
+static int ehci_get_frame (struct usb_hcd *hcd)
+{
+       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
+       return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
+}
 
 /*-------------------------------------------------------------------------*/
 
-/* EHCI 1.0 doesn't require PCI */
-
-#ifdef CONFIG_PCI
-
-/* PCI driver selection metadata; PCI hotplugging uses this */
-static const struct pci_device_id pci_ids [] = { {
-       /* handle any USB 2.0 EHCI controller */
-       PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
-       .driver_data =  (unsigned long) &ehci_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 ehci_pci_driver = {
-       .name =         (char *) hcd_name,
-       .id_table =     pci_ids,
-
-       .probe =        usb_hcd_pci_probe,
-       .remove =       usb_hcd_pci_remove,
-
-#ifdef CONFIG_PM
-       .suspend =      usb_hcd_pci_suspend,
-       .resume =       usb_hcd_pci_resume,
-#endif
-};
-
-#endif /* PCI */
-
-
 #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
 
 MODULE_DESCRIPTION (DRIVER_INFO);
 MODULE_AUTHOR (DRIVER_AUTHOR);
 MODULE_LICENSE ("GPL");
 
-static int __init init (void) 
-{
-       if (usb_disabled())
-               return -ENODEV;
-
-       pr_debug ("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
-               hcd_name,
-               sizeof (struct ehci_qh), sizeof (struct ehci_qtd),
-               sizeof (struct ehci_itd), sizeof (struct ehci_sitd));
-
-       return pci_register_driver (&ehci_pci_driver);
-}
-module_init (init);
+#ifdef CONFIG_PCI
+#include "ehci-pci.c"
+#endif
 
-static void __exit cleanup (void) 
-{      
-       pci_unregister_driver (&ehci_pci_driver);
-}
-module_exit (cleanup);
+#if !defined(CONFIG_PCI)
+#error "missing bus glue for ehci-hcd"
+#endif
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
new file mode 100644 (file)
index 0000000..66ebf75
--- /dev/null
@@ -0,0 +1,414 @@
+/*
+ * EHCI HCD (Host Controller Driver) PCI Bus Glue.
+ *
+ * Copyright (c) 2000-2004 by David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef CONFIG_PCI
+#error "This file is PCI bus glue.  CONFIG_PCI must be defined."
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
+ * off the controller (maybe it can boot from highspeed USB disks).
+ */
+static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
+{
+       struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
+
+       /* always say Linux will own the hardware */
+       pci_write_config_byte(pdev, where + 3, 1);
+
+       /* maybe wait a while for BIOS to respond */
+       if (cap & (1 << 16)) {
+               int msec = 5000;
+
+               do {
+                       msleep(10);
+                       msec -= 10;
+                       pci_read_config_dword(pdev, where, &cap);
+               } while ((cap & (1 << 16)) && msec);
+               if (cap & (1 << 16)) {
+                       ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
+                               where, cap);
+                       // some BIOS versions seem buggy...
+                       // return 1;
+                       ehci_warn (ehci, "continuing after BIOS bug...\n");
+                       /* disable all SMIs, and clear "BIOS owns" flag */
+                       pci_write_config_dword(pdev, where + 4, 0);
+                       pci_write_config_byte(pdev, where + 2, 0);
+               } else
+                       ehci_dbg(ehci, "BIOS handoff succeeded\n");
+       }
+       return 0;
+}
+
+/* called by khubd or root hub init threads */
+static int ehci_pci_reset (struct usb_hcd *hcd)
+{
+       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
+       u32                     temp;
+       unsigned                count = 256/4;
+
+       spin_lock_init (&ehci->lock);
+
+       ehci->caps = hcd->regs;
+       ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase));
+       dbg_hcs_params (ehci, "reset");
+       dbg_hcc_params (ehci, "reset");
+
+       /* cache this readonly data; minimize chip reads */
+       ehci->hcs_params = readl (&ehci->caps->hcs_params);
+
+       if (hcd->self.controller->bus == &pci_bus_type) {
+               struct pci_dev  *pdev = to_pci_dev(hcd->self.controller);
+
+               switch (pdev->vendor) {
+               case PCI_VENDOR_ID_TDI:
+                       if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
+                               ehci->is_tdi_rh_tt = 1;
+                               tdi_reset (ehci);
+                       }
+                       break;
+               case PCI_VENDOR_ID_AMD:
+                       /* AMD8111 EHCI doesn't work, according to AMD errata */
+                       if (pdev->device == 0x7463) {
+                               ehci_info (ehci, "ignoring AMD8111 (errata)\n");
+                               return -EIO;
+                       }
+                       break;
+               case PCI_VENDOR_ID_NVIDIA:
+                       /* NVidia reports that certain chips don't handle
+                        * QH, ITD, or SITD addresses above 2GB.  (But TD,
+                        * data buffer, and periodic schedule are normal.)
+                        */
+                       switch (pdev->device) {
+                       case 0x003c:    /* MCP04 */
+                       case 0x005b:    /* CK804 */
+                       case 0x00d8:    /* CK8 */
+                       case 0x00e8:    /* CK8S */
+                               if (pci_set_consistent_dma_mask(pdev,
+                                                       DMA_31BIT_MASK) < 0)
+                                       ehci_warn (ehci, "can't enable NVidia "
+                                               "workaround for >2GB RAM\n");
+                               break;
+                       }
+                       break;
+               }
+
+               /* optional debug port, normally in the first BAR */
+               temp = pci_find_capability (pdev, 0x0a);
+               if (temp) {
+                       pci_read_config_dword(pdev, temp, &temp);
+                       temp >>= 16;
+                       if ((temp & (3 << 13)) == (1 << 13)) {
+                               temp &= 0x1fff;
+                               ehci->debug = hcd->regs + temp;
+                               temp = readl (&ehci->debug->control);
+                               ehci_info (ehci, "debug port %d%s\n",
+                                       HCS_DEBUG_PORT(ehci->hcs_params),
+                                       (temp & DBGP_ENABLED)
+                                               ? " IN USE"
+                                               : "");
+                               if (!(temp & DBGP_ENABLED))
+                                       ehci->debug = NULL;
+                       }
+               }
+
+               temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
+       } else
+               temp = 0;
+
+       /* EHCI 0.96 and later may have "extended capabilities" */
+       while (temp && count--) {
+               u32             cap;
+
+               pci_read_config_dword (to_pci_dev(hcd->self.controller),
+                               temp, &cap);
+               ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp);
+               switch (cap & 0xff) {
+               case 1:                 /* BIOS/SMM/... handoff */
+                       if (bios_handoff (ehci, temp, cap) != 0)
+                               return -EOPNOTSUPP;
+                       break;
+               case 0:                 /* illegal reserved capability */
+                       ehci_warn (ehci, "illegal capability!\n");
+                       cap = 0;
+                       /* FALLTHROUGH */
+               default:                /* unknown */
+                       break;
+               }
+               temp = (cap >> 8) & 0xff;
+       }
+       if (!count) {
+               ehci_err (ehci, "bogus capabilities ... PCI problems!\n");
+               return -EIO;
+       }
+       if (ehci_is_TDI(ehci))
+               ehci_reset (ehci);
+
+       ehci_port_power (ehci, 0);
+
+       /* at least the Genesys GL880S needs fixup here */
+       temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
+       temp &= 0x0f;
+       if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
+               ehci_dbg (ehci, "bogus port configuration: "
+                       "cc=%d x pcc=%d < ports=%d\n",
+                       HCS_N_CC(ehci->hcs_params),
+                       HCS_N_PCC(ehci->hcs_params),
+                       HCS_N_PORTS(ehci->hcs_params));
+
+               if (hcd->self.controller->bus == &pci_bus_type) {
+                       struct pci_dev  *pdev;
+
+                       pdev = to_pci_dev(hcd->self.controller);
+                       switch (pdev->vendor) {
+                       case 0x17a0:            /* GENESYS */
+                               /* GL880S: should be PORTS=2 */
+                               temp |= (ehci->hcs_params & ~0xf);
+                               ehci->hcs_params = temp;
+                               break;
+                       case PCI_VENDOR_ID_NVIDIA:
+                               /* NF4: should be PCC=10 */
+                               break;
+                       }
+               }
+       }
+
+       /* force HC to halt state */
+       return ehci_halt (ehci);
+}
+
+static int ehci_pci_start (struct usb_hcd *hcd)
+{
+       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
+       int result = 0;
+
+       if (hcd->self.controller->bus == &pci_bus_type) {
+               struct pci_dev          *pdev;
+               u16                     port_wake;
+
+               pdev = to_pci_dev(hcd->self.controller);
+
+               /* Serial Bus Release Number is at PCI 0x60 offset */
+               pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
+
+               /* port wake capability, reported by boot firmware */
+               pci_read_config_word(pdev, 0x62, &port_wake);
+               hcd->can_wakeup = (port_wake & 1) != 0;
+
+               /* help hc dma work well with cachelines */
+               result = pci_set_mwi(pdev);
+               if (result)
+                       ehci_dbg(ehci, "unable to enable MWI - not fatal.\n");
+       }
+
+       return ehci_run (hcd);
+}
+
+/* always called by thread; normally rmmod */
+
+static void ehci_pci_stop (struct usb_hcd *hcd)
+{
+       ehci_stop (hcd);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_PM
+
+/* suspend/resume, section 4.3 */
+
+/* These routines rely on the bus (pci, platform, etc)
+ * to handle powerdown and wakeup, and currently also on
+ * transceivers that don't need any software attention to set up
+ * the right sort of wakeup.
+ */
+
+static int ehci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
+{
+       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
+
+       if (time_before (jiffies, ehci->next_statechange))
+               msleep (100);
+
+#ifdef CONFIG_USB_SUSPEND
+       (void) usb_suspend_device (hcd->self.root_hub);
+#else
+       usb_lock_device (hcd->self.root_hub);
+       (void) ehci_hub_suspend (hcd);
+       usb_unlock_device (hcd->self.root_hub);
+#endif
+
+       // save (PCI) FLADJ in case of Vaux power loss
+       // ... we'd only use it to handle clock skew
+
+       return 0;
+}
+
+static int ehci_pci_resume (struct usb_hcd *hcd)
+{
+       struct ehci_hcd         *ehci = hcd_to_ehci (hcd);
+       unsigned                port;
+       struct usb_device       *root = hcd->self.root_hub;
+       int                     retval = -EINVAL;
+
+       // maybe restore (PCI) FLADJ
+
+       if (time_before (jiffies, ehci->next_statechange))
+               msleep (100);
+
+       /* If any port is suspended (or owned by the companion),
+        * we know we can/must resume the HC (and mustn't reset it).
+        */
+       for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
+               u32     status;
+               port--;
+               status = readl (&ehci->regs->port_status [port]);
+               if (!(status & PORT_POWER))
+                       continue;
+               if (status & (PORT_SUSPEND | PORT_OWNER)) {
+                       down (&hcd->self.root_hub->serialize);
+                       retval = ehci_hub_resume (hcd);
+                       up (&hcd->self.root_hub->serialize);
+                       break;
+               }
+               if (!root->children [port])
+                       continue;
+               dbg_port (ehci, __FUNCTION__, port + 1, status);
+               usb_set_device_state (root->children[port],
+                                       USB_STATE_NOTATTACHED);
+       }
+
+       /* Else reset, to cope with power loss or flush-to-storage
+        * style "resume" having activated BIOS during reboot.
+        */
+       if (port == 0) {
+               (void) ehci_halt (ehci);
+               (void) ehci_reset (ehci);
+               (void) ehci_pci_reset (hcd);
+
+               /* emptying the schedule aborts any urbs */
+               spin_lock_irq (&ehci->lock);
+               if (ehci->reclaim)
+                       ehci->reclaim_ready = 1;
+               ehci_work (ehci, NULL);
+               spin_unlock_irq (&ehci->lock);
+
+               /* restart; khubd will disconnect devices */
+               retval = ehci_run (hcd);
+
+               /* here we "know" root ports should always stay powered;
+                * but some controllers may lose all power.
+                */
+               ehci_port_power (ehci, 1);
+       }
+
+       return retval;
+}
+#endif
+
+static const struct hc_driver ehci_pci_hc_driver = {
+       .description =          hcd_name,
+       .product_desc =         "EHCI Host Controller",
+       .hcd_priv_size =        sizeof(struct ehci_hcd),
+
+       /*
+        * generic hardware linkage
+        */
+       .irq =                  ehci_irq,
+       .flags =                HCD_MEMORY | HCD_USB2,
+
+       /*
+        * basic lifecycle operations
+        */
+       .reset =                ehci_pci_reset,
+       .start =                ehci_pci_start,
+#ifdef CONFIG_PM
+       .suspend =              ehci_pci_suspend,
+       .resume =               ehci_pci_resume,
+#endif
+       .stop =                 ehci_pci_stop,
+
+       /*
+        * managing i/o requests and associated device resources
+        */
+       .urb_enqueue =          ehci_urb_enqueue,
+       .urb_dequeue =          ehci_urb_dequeue,
+       .endpoint_disable =     ehci_endpoint_disable,
+
+       /*
+        * scheduling support
+        */
+       .get_frame_number =     ehci_get_frame,
+
+       /*
+        * root hub support
+        */
+       .hub_status_data =      ehci_hub_status_data,
+       .hub_control =          ehci_hub_control,
+       .hub_suspend =          ehci_hub_suspend,
+       .hub_resume =           ehci_hub_resume,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* PCI driver selection metadata; PCI hotplugging uses this */
+static const struct pci_device_id pci_ids [] = { {
+       /* handle any USB 2.0 EHCI controller */
+       PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
+       .driver_data =  (unsigned long) &ehci_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 ehci_pci_driver = {
+       .name =         (char *) hcd_name,
+       .id_table =     pci_ids,
+
+       .probe =        usb_hcd_pci_probe,
+       .remove =       usb_hcd_pci_remove,
+
+#ifdef CONFIG_PM
+       .suspend =      usb_hcd_pci_suspend,
+       .resume =       usb_hcd_pci_resume,
+#endif
+};
+
+static int __init ehci_hcd_pci_init (void)
+{
+       if (usb_disabled())
+               return -ENODEV;
+
+       pr_debug ("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
+               hcd_name,
+               sizeof (struct ehci_qh), sizeof (struct ehci_qtd),
+               sizeof (struct ehci_itd), sizeof (struct ehci_sitd));
+
+       return pci_register_driver (&ehci_pci_driver);
+}
+module_init (ehci_hcd_pci_init);
+
+static void __exit ehci_hcd_pci_cleanup (void)
+{
+       pci_unregister_driver (&ehci_pci_driver);
+}
+module_exit (ehci_hcd_pci_cleanup);
index f34a0516d35ff2b63ae0355080db4016b91343a8..18e257c2bdb5fca1006246d50636b24c01a2570e 100644 (file)
@@ -97,6 +97,7 @@ struct ehci_hcd {                     /* one per controller */
 #else
 #      define COUNT(x) do {} while (0)
 #endif
+       u8                      sbrn;           /* packed release number */
 };
 
 /* convert between an HCD pointer and the corresponding EHCI_HCD */