/* * Enhanced Host Controller Interface (EHCI) driver for USB. * * Maintainer: Alan Stern * * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_PPC_PS3) #include #endif /*-------------------------------------------------------------------------*/ /* * EHCI hc_driver implementation ... experimental, incomplete. * Based on the final 1.0 register interface specification. * * USB 2.0 shows up in upcoming www.pcmcia.org technology. * First was PCMCIA, like ISA; then CardBus, which is PCI. * Next comes "CardBay", using USB 2.0 signals. * * Contains additional contributions by Brad Hards, Rory Bolt, and others. * Special thanks to Intel and VIA for providing host controllers to * test this driver on, and Cypress (including In-System Design) for * providing early devices for those host controllers to talk to! */ #define DRIVER_AUTHOR "David Brownell" #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver" static const char hcd_name [] = "ehci_hcd"; #undef VERBOSE_DEBUG #undef EHCI_URB_TRACE #ifdef DEBUG #define EHCI_STATS #endif /* magic numbers that can affect system performance */ #define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */ #define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */ #define EHCI_TUNE_RL_TT 0 #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ #define EHCI_TUNE_MULT_TT 1 /* * Some drivers think it's safe to schedule isochronous transfers more than * 256 ms into the future (partly as a result of an old bug in the scheduling * code). In an attempt to avoid trouble, we will use a minimum scheduling * length of 512 frames instead of 256. */ #define EHCI_TUNE_FLS 1 /* (medium) 512-frame schedule */ #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 (DIV_ROUND_UP(HZ, 200) + 1) /* 5-ms async qh unlink delay */ /* Initial IRQ latency: faster than hw default */ static int log2_irq_thresh = 0; // 0 to 6 module_param (log2_irq_thresh, int, S_IRUGO); MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes"); /* initial park setting: slower than hw default */ static unsigned park = 0; module_param (park, uint, S_IRUGO); MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets"); /* for flakey hardware, ignore overcurrent indicators */ static int ignore_oc = 0; module_param (ignore_oc, bool, S_IRUGO); MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications"); /* for link power management(LPM) feature */ static unsigned int hird; module_param(hird, int, S_IRUGO); MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us"); #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) /*-------------------------------------------------------------------------*/ #include "ehci.h" #include "ehci-dbg.c" #include "pci-quirks.h" /*-------------------------------------------------------------------------*/ static void timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action) { /* Don't override timeouts which shrink or (later) disable * the async ring; just the I/O watchdog. Note that if a * SHRINK were pending, OFF would never be requested. */ if (timer_pending(&ehci->watchdog) && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF)) & ehci->actions)) return; if (!test_and_set_bit(action, &ehci->actions)) { unsigned long t; switch (action) { case TIMER_IO_WATCHDOG: if (!ehci->need_io_watchdog) return; t = EHCI_IO_JIFFIES; break; case TIMER_ASYNC_OFF: t = EHCI_ASYNC_JIFFIES; break; /* case TIMER_ASYNC_SHRINK: */ default: t = EHCI_SHRINK_JIFFIES; break; } mod_timer(&ehci->watchdog, t + jiffies); } } /*-------------------------------------------------------------------------*/ /* * handshake - spin reading hc until handshake completes or fails * @ptr: address of hc register to be read * @mask: bits to look at in result of read * @done: value of those bits when handshake succeeds * @usec: timeout in microseconds * * Returns negative errno, or zero on success * * Success happens when the "mask" bits have the specified value (hardware * handshake done). There are two failure modes: "usec" have passed (major * hardware flakeout), or the register reads as all-ones (hardware removed). * * That last failure should_only happen in cases like physical cardbus eject * before driver shutdown. But it also seems to be caused by bugs in cardbus * bridge shutdown: shutting down the bridge before the devices using it. */ static int handshake (struct ehci_hcd *ehci, void __iomem *ptr, u32 mask, u32 done, int usec) { u32 result; do { result = ehci_readl(ehci, ptr); if (result == ~(u32)0) /* card removed */ return -ENODEV; result &= mask; if (result == done) return 0; udelay (1); usec--; } while (usec > 0); return -ETIMEDOUT; } /* check TDI/ARC silicon is in host mode */ static int tdi_in_host_mode (struct ehci_hcd *ehci) { u32 __iomem *reg_ptr; u32 tmp; reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE); tmp = ehci_readl(ehci, reg_ptr); return (tmp & 3) == USBMODE_CM_HC; } /* force HC to halt state from unknown (EHCI spec section 2.3) */ static int ehci_halt (struct ehci_hcd *ehci) { u32 temp = ehci_readl(ehci, &ehci->regs->status); /* disable any irqs left enabled by previous code */ ehci_writel(ehci, 0, &ehci->regs->intr_enable); if (ehci_is_TDI(ehci) && tdi_in_host_mode(ehci) == 0) { return 0; } if ((temp & STS_HALT) != 0) return 0; temp = ehci_readl(ehci, &ehci->regs->command); temp &= ~CMD_RUN; ehci_writel(ehci, temp, &ehci->regs->command); return handshake (ehci, &ehci->regs->status, STS_HALT, STS_HALT, 16 * 125); } #if defined(CONFIG_USB_SUSPEND) && defined(CONFIG_PPC_PS3) /* * The EHCI controller of the Cell Super Companion Chip used in the * PS3 will stop the root hub after all root hub ports are suspended. * When in this condition handshake will return -ETIMEDOUT. The * STS_HLT bit will not be set, so inspection of the frame index is * used here to test for the condition. If the condition is found * return success to allow the USB suspend to complete. */ static int handshake_for_broken_root_hub(struct ehci_hcd *ehci, void __iomem *ptr, u32 mask, u32 done, int usec) { unsigned int old_index; int error; if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) return -ETIMEDOUT; old_index = ehci_read_frame_index(ehci); error = handshake(ehci, ptr, mask, done, usec); if (error == -ETIMEDOUT && ehci_read_frame_index(ehci) == old_index) return 0; return error; } #else static int handshake_for_broken_root_hub(struct ehci_hcd *ehci, void __iomem *ptr, u32 mask, u32 done, int usec) { return -ETIMEDOUT; } #endif static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr, u32 mask, u32 done, int usec) { int error; error = handshake(ehci, ptr, mask, done, usec); if (error == -ETIMEDOUT) error = handshake_for_broken_root_hub(ehci, ptr, mask, done, usec); if (error) { ehci_halt(ehci); ehci->rh_state = EHCI_RH_HALTED; ehci_err(ehci, "force halt; handshake %p %08x %08x -> %d\n", ptr, mask, done, error); } return error; } /* put TDI/ARC silicon into EHCI mode */ static void tdi_reset (struct ehci_hcd *ehci) { u32 __iomem *reg_ptr; u32 tmp; reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE); tmp = ehci_readl(ehci, reg_ptr); tmp |= USBMODE_CM_HC; /* The default byte access to MMR space is LE after * controller reset. Set the required endian mode * for transfer buffers to match the host microprocessor */ if (ehci_big_endian_mmio(ehci)) tmp |= USBMODE_BE; ehci_writel(ehci, tmp, reg_ptr); } /* reset a non-running (STS_HALT == 1) controller */ static int ehci_reset (struct ehci_hcd *ehci) { int retval; u32 command = ehci_readl(ehci, &ehci->regs->command); /* If the EHCI debug controller is active, special care must be * taken before and after a host controller reset */ if (ehci->debug && !dbgp_reset_prep()) ehci->debug = NULL; command |= CMD_RESET; dbg_cmd (ehci, "reset", command); ehci_writel(ehci, command, &ehci->regs->command); ehci->rh_state = EHCI_RH_HALTED; ehci->next_statechange = jiffies; retval = handshake (ehci, &ehci->regs->command, CMD_RESET, 0, 250 * 1000); if (ehci->has_hostpc) { ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS, (u32 __iomem *)(((u8 *)ehci->regs) + USBMODE_EX)); ehci_writel(ehci, TXFIFO_DEFAULT, (u32 __iomem *)(((u8 *)ehci->regs) + TXFILLTUNING)); } if (retval) return retval; if (ehci_is_TDI(ehci)) tdi_reset (ehci); if (ehci->debug) dbgp_external_startup(); return retval; } /* idle the controller (from running) */ static void ehci_quiesce (struct ehci_hcd *ehci) { u32 temp; #ifdef DEBUG if (ehci->rh_state != EHCI_RH_RUNNING) BUG (); #endif /* wait for any schedule enables/disables to take effect */ temp = ehci_readl(ehci, &ehci->regs->command) << 10; temp &= STS_ASS | STS_PSS; if (handshake_on_error_set_halt(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp, 16 * 125)) return; /* then disable anything that's still active */ temp = ehci_readl(ehci, &ehci->regs->command); temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE); ehci_writel(ehci, temp, &ehci->regs->command); /* hardware can take 16 microframes to turn off ... */ handshake_on_error_set_halt(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0, 16 * 125); } /*-------------------------------------------------------------------------*/ static void end_unlink_async(struct ehci_hcd *ehci); static void ehci_work(struct ehci_hcd *ehci); #include "ehci-hub.c" #include "ehci-lpm.c" #include "ehci-mem.c" #include "ehci-q.c" #include "ehci-sched.c" #include "ehci-sysfs.c" /*-------------------------------------------------------------------------*/ static void ehci_iaa_watchdog(unsigned long param) { struct ehci_hcd *ehci = (struct ehci_hcd *) param; unsigned long flags; spin_lock_irqsave (&ehci->lock, flags); /* Lost IAA irqs wedge things badly; seen first with a vt8235. * So we need this watchdog, but must protect it against both * (a) SMP races against real IAA firing and retriggering, and * (b) clean HC shutdown, when IAA watchdog was pending. */ if (ehci->reclaim && !timer_pending(&ehci->iaa_watchdog) && ehci->rh_state == EHCI_RH_RUNNING) { u32 cmd, status; /* If we get here, IAA is *REALLY* late. It's barely * conceivable that the system is so busy that CMD_IAAD * is still legitimately set, so let's be sure it's * clear before we read STS_IAA. (The HC should clear * CMD_IAAD when it sets STS_IAA.) */ cmd = ehci_readl(ehci, &ehci->regs->command); if (cmd & CMD_IAAD) ehci_writel(ehci, cmd & ~CMD_IAAD, &ehci->regs->command); /* If IAA is set here it either legitimately triggered * before we cleared IAAD above (but _way_ late, so we'll * still count it as lost) ... or a silicon erratum: * - VIA seems to set IAA without triggering the IRQ; * - IAAD potentially cleared without setting IAA. */ status = ehci_readl(ehci, &ehci->regs->status); if ((status & STS_IAA) || !(cmd & CMD_IAAD)) { COUNT (ehci->stats.lost_iaa); ehci_writel(ehci, STS_IAA, &ehci->regs->status); } ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n", status, cmd); end_unlink_async(ehci); } 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); /* ehci could run by timer, without IRQs ... */ ehci_work (ehci); spin_unlock_irqrestore (&ehci->lock, flags); } /* On some systems, leaving remote wakeup enabled prevents system shutdown. * The firmware seems to think that powering off is a wakeup event! * This routine turns off remote wakeup and everything else, on all ports. */ static void ehci_turn_off_all_ports(struct ehci_hcd *ehci) { int port = HCS_N_PORTS(ehci->hcs_params); while (port--) ehci_writel(ehci, PORT_RWC_BITS, &ehci->regs->port_status[port]); } /* * Halt HC, turn off all ports, and let the BIOS use the companion controllers. * Should be called with ehci->lock held. */ static void ehci_silence_controller(struct ehci_hcd *ehci) { ehci_halt(ehci); ehci_turn_off_all_ports(ehci); /* make BIOS/etc use companion controller during reboot */ ehci_writel(ehci, 0, &ehci->regs->configured_flag); /* unblock posted writes */ ehci_readl(ehci, &ehci->regs->configured_flag); } /* ehci_shutdown 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. */ static void ehci_shutdown(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); del_timer_sync(&ehci->watchdog); del_timer_sync(&ehci->iaa_watchdog); spin_lock_irq(&ehci->lock); ehci_silence_controller(ehci); spin_unlock_irq(&ehci->lock); } static void ehci_port_power (struct ehci_hcd *ehci, int is_on) { unsigned port; if (!HCS_PPC (ehci->hcs_params)) return; ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down"); for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) (void) ehci_hub_control(ehci_to_hcd(ehci), is_on ? SetPortFeature : ClearPortFeature, USB_PORT_FEAT_POWER, port--, NULL, 0); /* Flush those writes */ ehci_readl(ehci, &ehci->regs->command); msleep(20); } /*-------------------------------------------------------------------------*/ /* * 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) { timer_action_done (ehci, TIMER_IO_WATCHDOG); /* 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); if (ehci->next_uframe != -1) scan_periodic (ehci); 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 (ehci->rh_state == EHCI_RH_RUNNING && (ehci->async->qh_next.ptr != NULL || ehci->periodic_sched != 0)) timer_action (ehci, TIMER_IO_WATCHDOG); } /* * Called when the ehci_hcd module is removed. */ static void ehci_stop (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); ehci_dbg (ehci, "stop\n"); /* no more interrupts ... */ del_timer_sync (&ehci->watchdog); del_timer_sync(&ehci->iaa_watchdog); spin_lock_irq(&ehci->lock); if (ehci->rh_state == EHCI_RH_RUNNING) ehci_quiesce (ehci); ehci_silence_controller(ehci); ehci_reset (ehci); spin_unlock_irq(&ehci->lock); remove_sysfs_files(ehci); remove_debug_files (ehci); /* root hub is shut down separately (first, when possible) */ spin_lock_irq (&ehci->lock); if (ehci->async) ehci_work (ehci); spin_unlock_irq (&ehci->lock); ehci_mem_cleanup (ehci); if (ehci->amd_pll_fix == 1) usb_amd_dev_put(); #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", ehci_readl(ehci, &ehci->regs->status)); } /* one-time init, only for memory state */ static int ehci_init(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); u32 temp; int retval; u32 hcc_params; struct ehci_qh_hw *hw; spin_lock_init(&ehci->lock); /* * keep io watchdog by default, those good HCDs could turn off it later */ ehci->need_io_watchdog = 1; init_timer(&ehci->watchdog); 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; hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params); /* * by default set standard 80% (== 100 usec/uframe) max periodic * bandwidth as required by USB 2.0 */ ehci->uframe_periodic_max = 100; /* * hw default: 1K periodic list heads, one per frame. * periodic_size can shrink by USBCMD update if hcc_params allows. */ ehci->periodic_size = DEFAULT_I_TDPS; INIT_LIST_HEAD(&ehci->cached_itd_list); INIT_LIST_HEAD(&ehci->cached_sitd_list); if (HCC_PGM_FRAMELISTLEN(hcc_params)) { /* periodic schedule size can be smaller than default */ switch (EHCI_TUNE_FLS) { case 0: ehci->periodic_size = 1024; break; case 1: ehci->periodic_size = 512; break; case 2: ehci->periodic_size = 256; break; default: BUG(); } } if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0) return retval; /* controllers may cache some of the periodic schedule ... */ if (HCC_ISOC_CACHE(hcc_params)) // full frame cache ehci->i_thresh = 2 + 8; else // N microframes cached ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params); ehci->reclaim = NULL; ehci->next_uframe = -1; ehci->clock_frame = -1; /* * 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 * as the 'reclamation list head' too. * its dummy is used in hw_alt_next of many tds, to prevent the qh * from automatically advancing to the next td after short reads. */ ehci->async->qh_next.qh = NULL; hw = ehci->async->hw; hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma); hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD); hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7)); /* I = 1 */ hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT); hw->hw_qtd_next = EHCI_LIST_END(ehci); ehci->async->qh_state = QH_STATE_LINKED; hw->hw_alt_next = QTD_NEXT(ehci, ehci->async->dummy->qtd_dma); /* clear interrupt enables, set irq latency */ if (log2_irq_thresh < 0 || log2_irq_thresh > 6) log2_irq_thresh = 0; temp = 1 << (16 + log2_irq_thresh); if (HCC_PER_PORT_CHANGE_EVENT(hcc_params)) { ehci->has_ppcd = 1; ehci_dbg(ehci, "enable per-port change event\n"); temp |= CMD_PPCEE; } if (HCC_CANPARK(hcc_params)) { /* HW default park == 3, on hardware that supports it (like * NVidia and ALI silicon), maximizes throughput on the async * schedule by avoiding QH fetches between transfers. * * With fast usb storage devices and NForce2, "park" seems to * make problems: throughput reduction (!), data errors... */ if (park) { park = min(park, (unsigned) 3); temp |= CMD_PARK; temp |= park << 8; } ehci_dbg(ehci, "park %d\n", park); } if (HCC_PGM_FRAMELISTLEN(hcc_params)) { /* periodic schedule size can be smaller than default */ temp &= ~(3 << 2); temp |= (EHCI_TUNE_FLS << 2); } if (HCC_LPM(hcc_params)) { /* support link power management EHCI 1.1 addendum */ ehci_dbg(ehci, "support lpm\n"); ehci->has_lpm = 1; if (hird > 0xf) { ehci_dbg(ehci, "hird %d invalid, use default 0", hird); hird = 0; } temp |= hird << 24; } ehci->command = temp; /* Accept arbitrarily long scatter-gather lists */ if (!(hcd->driver->flags & HCD_LOCAL_MEM)) hcd->self.sg_tablesize = ~0; return 0; } /* start HC running; it's halted, ehci_init() has been run (once) */ static int ehci_run (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); u32 temp; u32 hcc_params; hcd->uses_new_polling = 1; /* EHCI spec section 4.1 */ ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list); ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next); /* * hcc_params controls whether ehci->regs->segment must (!!!) * be used; it constrains QH/ITD/SITD and QTD locations. * pci_pool consistent memory always uses segment zero. * streaming mappings for I/O buffers, like pci_map_single(), * can return segments above 4GB, if the device allows. * * NOTE: the dma mask is visible through dma_supported(), so * drivers can pass this info along ... like NETIF_F_HIGHDMA, * Scsi_Host.highmem_io, and so forth. It's readonly to all * host side drivers though. */ hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params); if (HCC_64BIT_ADDR(hcc_params)) { ehci_writel(ehci, 0, &ehci->regs->segment); #if 0 // this is deeply broken on almost all architectures if (!dma_set_mask(hcd->self.controller, DMA_BIT_MASK(64))) ehci_info(ehci, "enabled 64bit DMA\n"); #endif } // Philips, Intel, and maybe others need CMD_RUN before the // root hub will detect new devices (why?); NEC doesn't ehci->command &= ~(CMD_LRESET|CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); ehci->command |= CMD_RUN; ehci_writel(ehci, ehci->command, &ehci->regs->command); dbg_cmd (ehci, "init", ehci->command); /* * Start, enabling full USB 2.0 functionality ... usb 1.1 devices * are explicitly handed to companion controller(s), so no TT is * involved with the root hub. (Except where one is integrated, * and there's no companion controller unless maybe for USB OTG.) * * Turning on the CF flag will transfer ownership of all ports * 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. 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); ehci->rh_state = EHCI_RH_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); ehci->last_periodic_enable = ktime_get_real(); temp = HC_VERSION(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); ehci_info (ehci, "USB %x.%x started, EHCI %x.%02x%s\n", ((ehci->sbrn & 0xf0)>>4), (ehci->sbrn & 0x0f), temp >> 8, temp & 0xff, ignore_oc ? ", overcurrent ignored" : ""); ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */ /* GRR this is run-once init(), being done every time the HC starts. * So long as they're part of class devices, we can't do it init() * since the class device isn't created that early. */ create_debug_files(ehci); create_sysfs_files(ehci); return 0; } static int __maybe_unused ehci_setup (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); int retval; ehci->regs = (void __iomem *)ehci->caps + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); dbg_hcs_params(ehci, "reset"); dbg_hcc_params(ehci, "reset"); /* cache this readonly data; minimize chip reads */ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); ehci->sbrn = HCD_USB2; retval = ehci_halt(ehci); if (retval) return retval; /* data structure init */ retval = ehci_init(hcd); if (retval) return retval; ehci_reset(ehci); return 0; } /*-------------------------------------------------------------------------*/ static irqreturn_t ehci_irq (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); u32 status, masked_status, pcd_status = 0, cmd; int bh; spin_lock (&ehci->lock); status = ehci_readl(ehci, &ehci->regs->status); /* e.g. cardbus physical eject */ if (status == ~(u32) 0) { ehci_dbg (ehci, "device removed\n"); goto dead; } /* Shared IRQ? */ masked_status = status & INTR_MASK; if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) { spin_unlock(&ehci->lock); return IRQ_NONE; } /* clear (just) interrupts */ ehci_writel(ehci, masked_status, &ehci->regs->status); cmd = ehci_readl(ehci, &ehci->regs->command); bh = 0; #ifdef VERBOSE_DEBUG /* unrequested/ignored: Frame List Rollover */ dbg_status (ehci, "irq", status); #endif /* INT, ERR, and IAA interrupt rates can be throttled */ /* normal [4.15.1.2] or error [4.15.1.1] completion */ if (likely ((status & (STS_INT|STS_ERR)) != 0)) { if (likely ((status & STS_ERR) == 0)) COUNT (ehci->stats.normal); else COUNT (ehci->stats.error); bh = 1; } /* complete the unlinking of some qh [4.15.2.3] */ if (status & STS_IAA) { /* guard against (alleged) silicon errata */ if (cmd & CMD_IAAD) { ehci_writel(ehci, cmd & ~CMD_IAAD, &ehci->regs->command); ehci_dbg(ehci, "IAA with IAAD still set?\n"); } if (ehci->reclaim) { COUNT(ehci->stats.reclaim); end_unlink_async(ehci); } else ehci_dbg(ehci, "IAA with nothing to reclaim?\n"); } /* remote wakeup [4.3.1] */ if (status & STS_PCD) { unsigned i = HCS_N_PORTS (ehci->hcs_params); u32 ppcd = 0; /* kick root hub later */ pcd_status = status; /* resume root hub? */ if (!(cmd & CMD_RUN)) usb_hcd_resume_root_hub(hcd); /* get per-port change detect bits */ if (ehci->has_ppcd) ppcd = status >> 16; while (i--) { int pstatus; /* leverage per-port change bits feature */ if (ehci->has_ppcd && !(ppcd & (1 << i))) continue; pstatus = ehci_readl(ehci, &ehci->regs->port_status[i]); if (pstatus & PORT_OWNER) continue; if (!(test_bit(i, &ehci->suspended_ports) && ((pstatus & PORT_RESUME) || !(pstatus & PORT_SUSPEND)) && (pstatus & PORT_PE) && ehci->reset_done[i] == 0)) continue; /* start 20 msec resume signaling from this port, * and make khubd collect PORT_STAT_C_SUSPEND to * stop that signaling. Use 5 ms extra for safety, * like usb_port_resume() does. */ ehci->reset_done[i] = jiffies + msecs_to_jiffies(25); ehci_dbg (ehci, "port %d remote wakeup\n", i + 1); mod_timer(&hcd->rh_timer, ehci->reset_done[i]); } } /* PCI errors [4.15.2.4] */ if (unlikely ((status & STS_FATAL) != 0)) { ehci_err(ehci, "fatal error\n"); dbg_cmd(ehci, "fatal", cmd); dbg_status(ehci, "fatal", status); ehci_halt(ehci); dead: ehci_reset(ehci); ehci_writel(ehci, 0, &ehci->regs->configured_flag); usb_hc_died(hcd); /* generic layer kills/unlinks all urbs, then * uses ehci_stop to clean up the rest */ bh = 1; } if (bh) ehci_work (ehci); spin_unlock (&ehci->lock); if (pcd_status) usb_hcd_poll_rh_status(hcd); return IRQ_HANDLED; } /*-------------------------------------------------------------------------*/ /* * non-error returns are a promise to giveback() the urb later * we drop ownership so next owner (or urb unlink) can get it * * urb + dev is in hcd.self.controller.urb_list * we're queueing TDs onto software and hardware lists * * hcd-specific init for hcpriv hasn't been done yet * * NOTE: control, bulk, and interrupt share the same code to append TDs * to a (possibly active) QH, and the same QH scanning code. */ static int ehci_urb_enqueue ( struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags ) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); struct list_head qtd_list; INIT_LIST_HEAD (&qtd_list); switch (usb_pipetype (urb->pipe)) { case PIPE_CONTROL: /* qh_completions() code doesn't handle all the fault cases * in multi-TD control transfers. Even 1KB is rare anyway. */ if (urb->transfer_buffer_length > (16 * 1024)) return -EMSGSIZE; /* FALLTHROUGH */ /* case PIPE_BULK: */ default: if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags)) return -ENOMEM; return submit_async(ehci, urb, &qtd_list, mem_flags); case PIPE_INTERRUPT: if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags)) return -ENOMEM; return intr_submit(ehci, urb, &qtd_list, mem_flags); case PIPE_ISOCHRONOUS: if (urb->dev->speed == USB_SPEED_HIGH) return itd_submit (ehci, urb, mem_flags); else return sitd_submit (ehci, urb, mem_flags); } } static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) { /* failfast */ if (ehci->rh_state != EHCI_RH_RUNNING && ehci->reclaim) end_unlink_async(ehci); /* If the QH isn't linked then there's nothing we can do * unless we were called during a giveback, in which case * qh_completions() has to deal with it. */ if (qh->qh_state != QH_STATE_LINKED) { if (qh->qh_state == QH_STATE_COMPLETING) qh->needs_rescan = 1; return; } /* defer till later if busy */ if (ehci->reclaim) { struct ehci_qh *last; for (last = ehci->reclaim; last->reclaim; last = last->reclaim) continue; qh->qh_state = QH_STATE_UNLINK_WAIT; last->reclaim = qh; /* start IAA cycle */ } else start_unlink_async (ehci, qh); } /* remove from hardware lists * completions normally happen asynchronously */ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); struct ehci_qh *qh; unsigned long flags; int rc; spin_lock_irqsave (&ehci->lock, flags); rc = usb_hcd_check_unlink_urb(hcd, urb, status); if (rc) goto done; switch (usb_pipetype (urb->pipe)) { // case PIPE_CONTROL: // case PIPE_BULK: default: qh = (struct ehci_qh *) urb->hcpriv; if (!qh) break; 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: /* QH might be waiting for a Clear-TT-Buffer */ qh_completions(ehci, qh); break; } break; case PIPE_INTERRUPT: qh = (struct ehci_qh *) urb->hcpriv; if (!qh) break; switch (qh->qh_state) { case QH_STATE_LINKED: case QH_STATE_COMPLETING: intr_deschedule (ehci, qh); break; case QH_STATE_IDLE: qh_completions (ehci, qh); break; default: ehci_dbg (ehci, "bogus qh %p state %d\n", qh, qh->qh_state); goto done; } break; case PIPE_ISOCHRONOUS: // itd or sitd ... // wait till next completion, do it then. // completion irqs can wait up to 1024 msec, break; } done: spin_unlock_irqrestore (&ehci->lock, flags); return rc; } /*-------------------------------------------------------------------------*/ // bulk qh holds the data toggle static void ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); unsigned long flags; struct ehci_qh *qh, *tmp; /* ASSERT: any requests/urbs are being unlinked */ /* ASSERT: nobody can be submitting urbs for this any more */ rescan: spin_lock_irqsave (&ehci->lock, flags); qh = ep->hcpriv; if (!qh) goto done; /* endpoints can be iso streams. for now, we don't * accelerate iso completions ... so spin a while. */ if (qh->hw == NULL) { ehci_vdbg (ehci, "iso delay\n"); goto idle_timeout; } if (ehci->rh_state != EHCI_RH_RUNNING) qh->qh_state = QH_STATE_IDLE; switch (qh->qh_state) { case QH_STATE_LINKED: case QH_STATE_COMPLETING: for (tmp = ehci->async->qh_next.qh; tmp && tmp != qh; tmp = tmp->qh_next.qh) continue; /* periodic qh self-unlinks on empty, and a COMPLETING qh * may already be unlinked. */ if (tmp) 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); goto rescan; case QH_STATE_IDLE: /* fully unlinked */ if (qh->clearing_tt) goto idle_timeout; if (list_empty (&qh->qtd_list)) { qh_put (qh); break; } /* else FALL THROUGH */ default: /* caller was supposed to have unlinked any requests; * that's not our job. just leak this memory. */ ehci_err (ehci, "qh %p (#%02x) state %d%s\n", qh, ep->desc.bEndpointAddress, qh->qh_state, list_empty (&qh->qtd_list) ? "" : "(has tds)"); break; } ep->hcpriv = NULL; done: spin_unlock_irqrestore (&ehci->lock, flags); } static void ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); struct ehci_qh *qh; int eptype = usb_endpoint_type(&ep->desc); int epnum = usb_endpoint_num(&ep->desc); int is_out = usb_endpoint_dir_out(&ep->desc); unsigned long flags; if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT) return; spin_lock_irqsave(&ehci->lock, flags); qh = ep->hcpriv; /* For Bulk and Interrupt endpoints we maintain the toggle state * in the hardware; the toggle bits in udev aren't used at all. * When an endpoint is reset by usb_clear_halt() we must reset * the toggle bit in the QH. */ if (qh) { usb_settoggle(qh->dev, epnum, is_out, 0); if (!list_empty(&qh->qtd_list)) { WARN_ONCE(1, "clear_halt for a busy endpoint\n"); } else if (qh->qh_state == QH_STATE_LINKED || qh->qh_state == QH_STATE_COMPLETING) { /* The toggle value in the QH can't be updated * while the QH is active. Unlink it now; * re-linking will call qh_refresh(). */ if (eptype == USB_ENDPOINT_XFER_BULK) unlink_async(ehci, qh); else intr_deschedule(ehci, qh); } } spin_unlock_irqrestore(&ehci->lock, flags); } static int ehci_get_frame (struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci (hcd); return (ehci_read_frame_index(ehci) >> 3) % ehci->periodic_size; } /*-------------------------------------------------------------------------*/ MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR (DRIVER_AUTHOR); MODULE_LICENSE ("GPL"); #ifdef CONFIG_PCI #include "ehci-pci.c" #define PCI_DRIVER ehci_pci_driver #endif #ifdef CONFIG_USB_EHCI_FSL #include "ehci-fsl.c" #define PLATFORM_DRIVER ehci_fsl_driver #endif #ifdef CONFIG_USB_EHCI_MXC #include "ehci-mxc.c" #define PLATFORM_DRIVER ehci_mxc_driver #endif #ifdef CONFIG_USB_EHCI_SH #include "ehci-sh.c" #define PLATFORM_DRIVER ehci_hcd_sh_driver #endif #ifdef CONFIG_MIPS_ALCHEMY #include "ehci-au1xxx.c" #define PLATFORM_DRIVER ehci_hcd_au1xxx_driver #endif #ifdef CONFIG_USB_EHCI_HCD_OMAP #include "ehci-omap.c" #define PLATFORM_DRIVER ehci_hcd_omap_driver #endif #ifdef CONFIG_PPC_PS3 #include "ehci-ps3.c" #define PS3_SYSTEM_BUS_DRIVER ps3_ehci_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_XPS_USB_HCD_XILINX #include "ehci-xilinx-of.c" #define XILINX_OF_PLATFORM_DRIVER ehci_hcd_xilinx_of_driver #endif #ifdef CONFIG_PLAT_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 #ifdef CONFIG_USB_W90X900_EHCI #include "ehci-w90x900.c" #define PLATFORM_DRIVER ehci_hcd_w90x900_driver #endif #ifdef CONFIG_ARCH_AT91 #include "ehci-atmel.c" #define PLATFORM_DRIVER ehci_atmel_driver #endif #ifdef CONFIG_USB_OCTEON_EHCI #include "ehci-octeon.c" #define PLATFORM_DRIVER ehci_octeon_driver #endif #ifdef CONFIG_USB_CNS3XXX_EHCI #include "ehci-cns3xxx.c" #define PLATFORM_DRIVER cns3xxx_ehci_driver #endif #ifdef CONFIG_ARCH_VT8500 #include "ehci-vt8500.c" #define PLATFORM_DRIVER vt8500_ehci_driver #endif #ifdef CONFIG_PLAT_SPEAR #include "ehci-spear.c" #define PLATFORM_DRIVER spear_ehci_hcd_driver #endif #ifdef CONFIG_USB_EHCI_MSM #include "ehci-msm.c" #define PLATFORM_DRIVER ehci_msm_driver #endif #ifdef CONFIG_USB_EHCI_HCD_PMC_MSP #include "ehci-pmcmsp.c" #define PLATFORM_DRIVER ehci_hcd_msp_driver #endif #ifdef CONFIG_USB_EHCI_TEGRA #include "ehci-tegra.c" #define PLATFORM_DRIVER tegra_ehci_driver #endif #ifdef CONFIG_USB_EHCI_S5P #include "ehci-s5p.c" #define PLATFORM_DRIVER s5p_ehci_driver #endif #ifdef CONFIG_USB_EHCI_ATH79 #include "ehci-ath79.c" #define PLATFORM_DRIVER ehci_ath79_driver #endif #ifdef CONFIG_SPARC_LEON #include "ehci-grlib.c" #define PLATFORM_DRIVER ehci_grlib_driver #endif #ifdef CONFIG_USB_PXA168_EHCI #include "ehci-pxa168.c" #define PLATFORM_DRIVER ehci_pxa168_driver #endif #ifdef CONFIG_CPU_XLR #include "ehci-xls.c" #define PLATFORM_DRIVER ehci_xls_driver #endif #ifdef CONFIG_USB_EHCI_MV #include "ehci-mv.c" #define PLATFORM_DRIVER ehci_mv_driver #endif #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \ !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \ !defined(XILINX_OF_PLATFORM_DRIVER) #error "missing bus glue for ehci-hcd" #endif static int __init ehci_hcd_init(void) { int retval = 0; if (usb_disabled()) return -ENODEV; printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name); set_bit(USB_EHCI_LOADED, &usb_hcds_loaded); if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) || test_bit(USB_OHCI_LOADED, &usb_hcds_loaded)) printk(KERN_WARNING "Warning! ehci_hcd should always be loaded" " before uhci_hcd and ohci_hcd, not after\n"); 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)); #ifdef DEBUG ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root); if (!ehci_debug_root) { retval = -ENOENT; goto err_debug; } #endif #ifdef PLATFORM_DRIVER retval = platform_driver_register(&PLATFORM_DRIVER); if (retval < 0) goto clean0; #endif #ifdef PCI_DRIVER retval = pci_register_driver(&PCI_DRIVER); if (retval < 0) goto clean1; #endif #ifdef PS3_SYSTEM_BUS_DRIVER retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER); if (retval < 0) goto clean2; #endif #ifdef OF_PLATFORM_DRIVER retval = platform_driver_register(&OF_PLATFORM_DRIVER); if (retval < 0) goto clean3; #endif #ifdef XILINX_OF_PLATFORM_DRIVER retval = platform_driver_register(&XILINX_OF_PLATFORM_DRIVER); if (retval < 0) goto clean4; #endif return retval; #ifdef XILINX_OF_PLATFORM_DRIVER /* platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); */ clean4: #endif #ifdef OF_PLATFORM_DRIVER platform_driver_unregister(&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); clean1: #endif #ifdef PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); clean0: #endif #ifdef DEBUG debugfs_remove(ehci_debug_root); ehci_debug_root = NULL; err_debug: #endif clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); return retval; } module_init(ehci_hcd_init); static void __exit ehci_hcd_cleanup(void) { #ifdef XILINX_OF_PLATFORM_DRIVER platform_driver_unregister(&XILINX_OF_PLATFORM_DRIVER); #endif #ifdef OF_PLATFORM_DRIVER platform_driver_unregister(&OF_PLATFORM_DRIVER); #endif #ifdef PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); #endif #ifdef PCI_DRIVER pci_unregister_driver(&PCI_DRIVER); #endif #ifdef PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); #endif #ifdef DEBUG debugfs_remove(ehci_debug_root); #endif clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); } module_exit(ehci_hcd_cleanup);