diff options
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 164 |
1 files changed, 122 insertions, 42 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index c1514442883e..4caa6a8b9a37 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -33,6 +33,7 @@ #include <linux/usb.h> #include <linux/moduleparam.h> #include <linux/dma-mapping.h> +#include <linux/debugfs.h> #include "../core/hcd.h" @@ -109,7 +110,7 @@ static const char hcd_name [] = "ehci_hcd"; #define EHCI_TUNE_MULT_TT 1 #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */ -#define EHCI_IAA_JIFFIES (HZ/100) /* arbitrary; ~10 msec */ +#define EHCI_IAA_MSECS 10 /* arbitrary */ #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */ #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */ #define EHCI_SHRINK_JIFFIES (HZ/200) /* async qh unlink delay */ @@ -266,6 +267,7 @@ static void ehci_quiesce (struct ehci_hcd *ehci) /*-------------------------------------------------------------------------*/ +static void end_unlink_async(struct ehci_hcd *ehci); static void ehci_work(struct ehci_hcd *ehci); #include "ehci-hub.c" @@ -275,25 +277,41 @@ static void ehci_work(struct ehci_hcd *ehci); /*-------------------------------------------------------------------------*/ -static void ehci_watchdog (unsigned long param) +static void ehci_iaa_watchdog(unsigned long param) { struct ehci_hcd *ehci = (struct ehci_hcd *) param; unsigned long flags; + u32 status, cmd; spin_lock_irqsave (&ehci->lock, flags); + WARN_ON(!ehci->reclaim); - /* lost IAA irqs wedge things badly; seen with a vt8235 */ + status = ehci_readl(ehci, &ehci->regs->status); + cmd = ehci_readl(ehci, &ehci->regs->command); + ehci_dbg(ehci, "IAA watchdog: status %x cmd %x\n", status, cmd); + + /* lost IAA irqs wedge things badly; seen first with a vt8235 */ if (ehci->reclaim) { - u32 status = ehci_readl(ehci, &ehci->regs->status); if (status & STS_IAA) { ehci_vdbg (ehci, "lost IAA\n"); COUNT (ehci->stats.lost_iaa); ehci_writel(ehci, STS_IAA, &ehci->regs->status); - ehci->reclaim_ready = 1; } + ehci_writel(ehci, cmd & ~CMD_IAAD, &ehci->regs->command); + end_unlink_async(ehci); } - /* stop async processing after it's idled a bit */ + spin_unlock_irqrestore(&ehci->lock, flags); +} + +static void ehci_watchdog(unsigned long param) +{ + struct ehci_hcd *ehci = (struct ehci_hcd *) param; + unsigned long flags; + + spin_lock_irqsave(&ehci->lock, flags); + + /* stop async processing after it's idled a bit */ if (test_bit (TIMER_ASYNC_OFF, &ehci->actions)) start_unlink_async (ehci, ehci->async); @@ -363,8 +381,6 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on) static void ehci_work (struct ehci_hcd *ehci) { timer_action_done (ehci, TIMER_IO_WATCHDOG); - if (ehci->reclaim_ready) - end_unlink_async (ehci); /* another CPU may drop ehci->lock during a schedule scan while * it reports urb completions. this flag guards against bogus @@ -399,6 +415,7 @@ static void ehci_stop (struct usb_hcd *hcd) /* no more interrupts ... */ del_timer_sync (&ehci->watchdog); + del_timer_sync(&ehci->iaa_watchdog); spin_lock_irq(&ehci->lock); if (HC_IS_RUNNING (hcd->state)) @@ -447,6 +464,10 @@ static int ehci_init(struct usb_hcd *hcd) ehci->watchdog.function = ehci_watchdog; ehci->watchdog.data = (unsigned long) ehci; + init_timer(&ehci->iaa_watchdog); + ehci->iaa_watchdog.function = ehci_iaa_watchdog; + ehci->iaa_watchdog.data = (unsigned long) ehci; + /* * hw default: 1K periodic list heads, one per frame. * periodic_size can shrink by USBCMD update if hcc_params allows. @@ -463,7 +484,6 @@ static int ehci_init(struct usb_hcd *hcd) ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params); ehci->reclaim = NULL; - ehci->reclaim_ready = 0; ehci->next_uframe = -1; /* @@ -575,12 +595,15 @@ static int ehci_run (struct usb_hcd *hcd) * from the companions to the EHCI controller. If any of the * companions are in the middle of a port reset at the time, it * could cause trouble. Write-locking ehci_cf_port_reset_rwsem - * guarantees that no resets are in progress. + * guarantees that no resets are in progress. After we set CF, + * a short delay lets the hardware catch up; new resets shouldn't + * be started before the port switching actions could complete. */ down_write(&ehci_cf_port_reset_rwsem); hcd->state = HC_STATE_RUNNING; ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ + msleep(5); up_write(&ehci_cf_port_reset_rwsem); temp = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase)); @@ -651,8 +674,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) /* complete the unlinking of some qh [4.15.2.3] */ if (status & STS_IAA) { COUNT (ehci->stats.reclaim); - ehci->reclaim_ready = 1; - bh = 1; + end_unlink_async(ehci); } /* remote wakeup [4.3.1] */ @@ -758,10 +780,16 @@ static int ehci_urb_enqueue ( static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) { - /* if we need to use IAA and it's busy, defer */ - if (qh->qh_state == QH_STATE_LINKED - && ehci->reclaim - && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) { + /* failfast */ + if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) + end_unlink_async(ehci); + + /* if it's not linked then there's nothing to do */ + if (qh->qh_state != QH_STATE_LINKED) + ; + + /* defer till later if busy */ + else if (ehci->reclaim) { struct ehci_qh *last; for (last = ehci->reclaim; @@ -771,12 +799,8 @@ static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) qh->qh_state = QH_STATE_UNLINK_WAIT; last->reclaim = qh; - /* bypass IAA if the hc can't care */ - } else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim) - end_unlink_async (ehci); - - /* something else might have unlinked the qh by now */ - if (qh->qh_state == QH_STATE_LINKED) + /* start IAA cycle */ + } else start_unlink_async (ehci, qh); } @@ -803,7 +827,19 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) qh = (struct ehci_qh *) urb->hcpriv; if (!qh) break; - unlink_async (ehci, qh); + switch (qh->qh_state) { + case QH_STATE_LINKED: + case QH_STATE_COMPLETING: + unlink_async(ehci, qh); + break; + case QH_STATE_UNLINK: + case QH_STATE_UNLINK_WAIT: + /* already started */ + break; + case QH_STATE_IDLE: + WARN_ON(1); + break; + } break; case PIPE_INTERRUPT: @@ -826,16 +862,16 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) /* reschedule QH iff another request is queued */ if (!list_empty (&qh->qtd_list) && HC_IS_RUNNING (hcd->state)) { - int status; + int schedule_status; - status = qh_schedule (ehci, qh); + schedule_status = qh_schedule (ehci, qh); spin_unlock_irqrestore (&ehci->lock, flags); - if (status != 0) { + if (schedule_status != 0) { // shouldn't happen often, but ... // FIXME kill those tds' urbs err ("can't reschedule qh %p, err %d", - qh, status); + qh, schedule_status); } return status; } @@ -895,6 +931,7 @@ rescan: unlink_async (ehci, qh); /* FALL THROUGH */ case QH_STATE_UNLINK: /* wait for hw to finish? */ + case QH_STATE_UNLINK_WAIT: idle_timeout: spin_unlock_irqrestore (&ehci->lock, flags); schedule_timeout_uninterruptible(1); @@ -956,11 +993,26 @@ MODULE_LICENSE ("GPL"); #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver #endif -#ifdef CONFIG_440EPX +#if defined(CONFIG_440EPX) && !defined(CONFIG_PPC_MERGE) #include "ehci-ppc-soc.c" #define PLATFORM_DRIVER ehci_ppc_soc_driver #endif +#ifdef CONFIG_USB_EHCI_HCD_PPC_OF +#include "ehci-ppc-of.c" +#define OF_PLATFORM_DRIVER ehci_hcd_ppc_of_driver +#endif + +#ifdef CONFIG_ARCH_ORION +#include "ehci-orion.c" +#define PLATFORM_DRIVER ehci_orion_driver +#endif + +#ifdef CONFIG_ARCH_IXP4XX +#include "ehci-ixp4xx.c" +#define PLATFORM_DRIVER ixp4xx_ehci_driver +#endif + #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \ !defined(PS3_SYSTEM_BUS_DRIVER) #error "missing bus glue for ehci-hcd" @@ -975,41 +1027,66 @@ static int __init ehci_hcd_init(void) sizeof(struct ehci_qh), sizeof(struct ehci_qtd), sizeof(struct ehci_itd), sizeof(struct ehci_sitd)); +#ifdef DEBUG + ehci_debug_root = debugfs_create_dir("ehci", NULL); + if (!ehci_debug_root) + return -ENOENT; +#endif + #ifdef PLATFORM_DRIVER retval = platform_driver_register(&PLATFORM_DRIVER); if (retval < 0) - return retval; + goto clean0; #endif #ifdef PCI_DRIVER retval = pci_register_driver(&PCI_DRIVER); - if (retval < 0) { -#ifdef PLATFORM_DRIVER - platform_driver_unregister(&PLATFORM_DRIVER); -#endif - return retval; - } + if (retval < 0) + goto clean1; #endif #ifdef PS3_SYSTEM_BUS_DRIVER retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER); - if (retval < 0) { -#ifdef PLATFORM_DRIVER - platform_driver_unregister(&PLATFORM_DRIVER); + if (retval < 0) + goto clean2; +#endif + +#ifdef OF_PLATFORM_DRIVER + retval = of_register_platform_driver(&OF_PLATFORM_DRIVER); + if (retval < 0) + goto clean3; +#endif + return retval; + +#ifdef OF_PLATFORM_DRIVER + /* of_unregister_platform_driver(&OF_PLATFORM_DRIVER); */ +clean3: +#endif +#ifdef PS3_SYSTEM_BUS_DRIVER + ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); +clean2: #endif #ifdef PCI_DRIVER - pci_unregister_driver(&PCI_DRIVER); + pci_unregister_driver(&PCI_DRIVER); +clean1: #endif - return retval; - } +#ifdef PLATFORM_DRIVER + platform_driver_unregister(&PLATFORM_DRIVER); +clean0: +#endif +#ifdef DEBUG + debugfs_remove(ehci_debug_root); + ehci_debug_root = NULL; #endif - return retval; } module_init(ehci_hcd_init); static void __exit ehci_hcd_cleanup(void) { +#ifdef OF_PLATFORM_DRIVER + of_unregister_platform_driver(&OF_PLATFORM_DRIVER); +#endif #ifdef PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); #endif @@ -1019,6 +1096,9 @@ static void __exit ehci_hcd_cleanup(void) #ifdef PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); #endif +#ifdef DEBUG + debugfs_remove(ehci_debug_root); +#endif } module_exit(ehci_hcd_cleanup); |