diff options
Diffstat (limited to 'drivers/usb/host/uhci-hcd.c')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.c | 139 |
1 files changed, 70 insertions, 69 deletions
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index d225e11f405..7b48567622e 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -13,7 +13,7 @@ * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com). * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) - * (C) Copyright 2004-2005 Alan Stern, stern@rowland.harvard.edu + * (C) Copyright 2004-2006 Alan Stern, stern@rowland.harvard.edu * * Intel documents this fairly well, and as far as I know there * are no royalties or anything like that, but even so there are @@ -31,7 +31,6 @@ #include <linux/ioport.h> #include <linux/sched.h> #include <linux/slab.h> -#include <linux/smp_lock.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/interrupt.h> @@ -88,15 +87,6 @@ static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state); static void wakeup_rh(struct uhci_hcd *uhci); static void uhci_get_current_frame_number(struct uhci_hcd *uhci); -/* If a transfer is still active after this much time, turn off FSBR */ -#define IDLE_TIMEOUT msecs_to_jiffies(50) -#define FSBR_DELAY msecs_to_jiffies(50) - -/* When we timeout an idle transfer for FSBR, we'll switch it over to */ -/* depth first traversal. We'll do it in groups of this number of TDs */ -/* to make sure it doesn't hog all of the bandwidth */ -#define DEPTH_INTERVAL 5 - #include "uhci-debug.c" #include "uhci-q.c" #include "uhci-hub.c" @@ -120,22 +110,29 @@ static void finish_reset(struct uhci_hcd *uhci) uhci->is_stopped = UHCI_IS_STOPPED; uhci_to_hcd(uhci)->state = HC_STATE_HALT; uhci_to_hcd(uhci)->poll_rh = 0; + + uhci->dead = 0; /* Full reset resurrects the controller */ } /* * Last rites for a defunct/nonfunctional controller * or one we don't want to use any more. */ -static void hc_died(struct uhci_hcd *uhci) +static void uhci_hc_died(struct uhci_hcd *uhci) { + uhci_get_current_frame_number(uhci); uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr); finish_reset(uhci); - uhci->hc_inaccessible = 1; + uhci->dead = 1; + + /* The current frame may already be partway finished */ + ++uhci->frame_number; } /* - * Initialize a controller that was newly discovered or has just been - * resumed. In either case we can't be sure of its previous state. + * Initialize a controller that was newly discovered or has lost power + * or otherwise been reset while it was suspended. In none of these cases + * can we be sure of its previous state. */ static void check_and_reset_hc(struct uhci_hcd *uhci) { @@ -155,7 +152,8 @@ static void configure_hc(struct uhci_hcd *uhci) outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD); /* Set the current frame number */ - outw(uhci->frame_number, uhci->io_addr + USBFRNUM); + outw(uhci->frame_number & UHCI_MAX_SOF_NUMBER, + uhci->io_addr + USBFRNUM); /* Mark controller as not halted before we enable interrupts */ uhci_to_hcd(uhci)->state = HC_STATE_SUSPENDED; @@ -207,7 +205,8 @@ __acquires(uhci->lock) int int_enable; auto_stop = (new_state == UHCI_RH_AUTO_STOPPED); - dev_dbg(uhci_dev(uhci), "%s%s\n", __FUNCTION__, + dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev, + "%s%s\n", __FUNCTION__, (auto_stop ? " (auto-stop)" : "")); /* If we get a suspend request when we're already auto-stopped @@ -241,27 +240,27 @@ __acquires(uhci->lock) spin_unlock_irq(&uhci->lock); msleep(1); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Died */ + if (uhci->dead) return; } if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) - dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n"); + dev_warn(&uhci_to_hcd(uhci)->self.root_hub->dev, + "Controller not stopped yet!\n"); uhci_get_current_frame_number(uhci); - smp_wmb(); uhci->rh_state = new_state; uhci->is_stopped = UHCI_IS_STOPPED; uhci_to_hcd(uhci)->poll_rh = !int_enable; uhci_scan_schedule(uhci, NULL); + uhci_fsbr_off(uhci); } static void start_rh(struct uhci_hcd *uhci) { uhci_to_hcd(uhci)->state = HC_STATE_RUNNING; uhci->is_stopped = 0; - smp_wmb(); /* Mark it configured and running with a 64-byte max packet. * All interrupts are enabled, even though RESUME won't do anything. @@ -278,7 +277,8 @@ static void wakeup_rh(struct uhci_hcd *uhci) __releases(uhci->lock) __acquires(uhci->lock) { - dev_dbg(uhci_dev(uhci), "%s%s\n", __FUNCTION__, + dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev, + "%s%s\n", __FUNCTION__, uhci->rh_state == UHCI_RH_AUTO_STOPPED ? " (auto-start)" : ""); @@ -293,7 +293,7 @@ __acquires(uhci->lock) spin_unlock_irq(&uhci->lock); msleep(20); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Died */ + if (uhci->dead) return; /* End Global Resume and wait for EOP to be sent */ @@ -345,7 +345,7 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs) errbuf, ERRBUF_LEN); lprintk(errbuf); } - hc_died(uhci); + uhci_hc_died(uhci); /* Force a callback in case there are * pending unlinks */ @@ -368,12 +368,21 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs) /* * Store the current frame number in uhci->frame_number if the controller - * is runnning + * is runnning. Expand from 11 bits (of which we use only 10) to a + * full-sized integer. + * + * Like many other parts of the driver, this code relies on being polled + * more than once per second as long as the controller is running. */ static void uhci_get_current_frame_number(struct uhci_hcd *uhci) { - if (!uhci->is_stopped) - uhci->frame_number = inw(uhci->io_addr + USBFRNUM); + if (!uhci->is_stopped) { + unsigned delta; + + delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) & + (UHCI_NUMFRAMES - 1); + uhci->frame_number += delta; + } } /* @@ -407,7 +416,7 @@ static void release_uhci(struct uhci_hcd *uhci) uhci->frame, uhci->frame_dma_handle); } -static int uhci_reset(struct usb_hcd *hcd) +static int uhci_init(struct usb_hcd *hcd) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); unsigned io_size = (unsigned) hcd->rsrc_len; @@ -459,7 +468,7 @@ static void uhci_shutdown(struct pci_dev *pdev) { struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev); - hc_died(hcd_to_uhci(hcd)); + uhci_hc_died(hcd_to_uhci(hcd)); } /* @@ -487,14 +496,10 @@ static int uhci_start(struct usb_hcd *hcd) hcd->uses_new_polling = 1; - uhci->fsbr = 0; - uhci->fsbrtimeout = 0; - spin_lock_init(&uhci->lock); - - INIT_LIST_HEAD(&uhci->td_remove_list); + setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout, + (unsigned long) uhci); INIT_LIST_HEAD(&uhci->idle_qh_list); - init_waitqueue_head(&uhci->waitqh); if (DEBUG_CONFIGURED) { @@ -665,11 +670,12 @@ static void uhci_stop(struct usb_hcd *hcd) struct uhci_hcd *uhci = hcd_to_uhci(hcd); spin_lock_irq(&uhci->lock); - if (!uhci->hc_inaccessible) - hc_died(uhci); + if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead) + uhci_hc_died(uhci); uhci_scan_schedule(uhci, NULL); spin_unlock_irq(&uhci->lock); + del_timer_sync(&uhci->fsbr_timer); release_uhci(uhci); } @@ -677,12 +683,15 @@ static void uhci_stop(struct usb_hcd *hcd) static int uhci_rh_suspend(struct usb_hcd *hcd) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); + int rc = 0; spin_lock_irq(&uhci->lock); - if (!uhci->hc_inaccessible) /* Not dead */ + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) + rc = -ESHUTDOWN; + else if (!uhci->dead) suspend_rh(uhci, UHCI_RH_SUSPENDED); spin_unlock_irq(&uhci->lock); - return 0; + return rc; } static int uhci_rh_resume(struct usb_hcd *hcd) @@ -691,13 +700,10 @@ static int uhci_rh_resume(struct usb_hcd *hcd) int rc = 0; spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) { - if (uhci->rh_state == UHCI_RH_SUSPENDED) { - dev_warn(uhci_dev(uhci), "HC isn't running!\n"); - rc = -ENODEV; - } - /* Otherwise the HC is dead */ - } else + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) { + dev_warn(&hcd->self.root_hub->dev, "HC isn't running!\n"); + rc = -ESHUTDOWN; + } else if (!uhci->dead) wakeup_rh(uhci); spin_unlock_irq(&uhci->lock); return rc; @@ -711,8 +717,8 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message) dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__); spin_lock_irq(&uhci->lock); - if (uhci->hc_inaccessible) /* Dead or already suspended */ - goto done; + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead) + goto done_okay; /* Already suspended or dead */ if (uhci->rh_state > UHCI_RH_SUSPENDED) { dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n"); @@ -725,12 +731,12 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message) */ pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0); mb(); - clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); - uhci->hc_inaccessible = 1; hcd->poll_rh = 0; /* FIXME: Enable non-PME# remote wakeup? */ +done_okay: + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); done: spin_unlock_irq(&uhci->lock); return rc; @@ -743,24 +749,22 @@ static int uhci_resume(struct usb_hcd *hcd) dev_dbg(uhci_dev(uhci), "%s\n", __FUNCTION__); /* Since we aren't in D3 any more, it's safe to set this flag - * even if the controller was dead. It might not even be dead - * any more, if the firmware or quirks code has reset it. + * even if the controller was dead. */ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); mb(); - if (uhci->rh_state == UHCI_RH_RESET) /* Dead */ - return 0; spin_lock_irq(&uhci->lock); /* FIXME: Disable non-PME# remote wakeup? */ - uhci->hc_inaccessible = 0; - - /* The BIOS may have changed the controller settings during a - * system wakeup. Check it and reconfigure to avoid problems. + /* The firmware or a boot kernel may have changed the controller + * settings during a system wakeup. Check it and reconfigure + * to avoid problems. */ check_and_reset_hc(uhci); + + /* If the controller was dead before, it's back alive now */ configure_hc(uhci); if (uhci->rh_state == UHCI_RH_RESET) { @@ -810,18 +814,15 @@ done: static int uhci_hcd_get_frame_number(struct usb_hcd *hcd) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); - unsigned long flags; - int is_stopped; - int frame_number; + unsigned frame_number; + unsigned delta; /* Minimize latency by avoiding the spinlock */ - local_irq_save(flags); - is_stopped = uhci->is_stopped; - smp_rmb(); - frame_number = (is_stopped ? uhci->frame_number : - inw(uhci->io_addr + USBFRNUM)); - local_irq_restore(flags); - return frame_number; + frame_number = uhci->frame_number; + barrier(); + delta = (inw(uhci->io_addr + USBFRNUM) - frame_number) & + (UHCI_NUMFRAMES - 1); + return frame_number + delta; } static const char hcd_name[] = "uhci_hcd"; @@ -836,7 +837,7 @@ static const struct hc_driver uhci_driver = { .flags = HCD_USB11, /* Basic lifecycle operations */ - .reset = uhci_reset, + .reset = uhci_init, .start = uhci_start, #ifdef CONFIG_PM .suspend = uhci_suspend, |