| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Alan Stern | 1882 | 36.01% | 68 | 34.00% |
| David Brownell | 1186 | 22.69% | 53 | 26.50% |
| Linus Torvalds | 708 | 13.55% | 4 | 2.00% |
| Matt Porter | 285 | 5.45% | 1 | 0.50% |
| Matthieu CASTET | 165 | 3.16% | 2 | 1.00% |
| Alek Du | 118 | 2.26% | 4 | 2.00% |
| Kumar Gala | 104 | 1.99% | 1 | 0.50% |
| Benjamin Herrenschmidt | 88 | 1.68% | 1 | 0.50% |
| Geoff Levand | 78 | 1.49% | 4 | 2.00% |
| Valentine Barshak | 71 | 1.36% | 1 | 0.50% |
| Michael Grzeschik | 57 | 1.09% | 1 | 0.50% |
| Sage Sharp | 56 | 1.07% | 1 | 0.50% |
| Grant C. Likely | 50 | 0.96% | 2 | 1.00% |
| Ming Lei | 36 | 0.69% | 2 | 1.00% |
| Tony Jones | 28 | 0.54% | 1 | 0.50% |
| Jason Wessel | 24 | 0.46% | 1 | 0.50% |
| Marcelo Tosatti | 23 | 0.44% | 1 | 0.50% |
| Marc Ohlf | 17 | 0.33% | 1 | 0.50% |
| Stanislaw Gruszka | 14 | 0.27% | 1 | 0.50% |
| Jan Andersson | 14 | 0.27% | 2 | 1.00% |
| Oliver Neukum | 13 | 0.25% | 2 | 1.00% |
| Stefan Roese | 13 | 0.25% | 1 | 0.50% |
| Vladimir Barinov | 13 | 0.25% | 1 | 0.50% |
| Jan Beulich | 12 | 0.23% | 1 | 0.50% |
| Anoop | 12 | 0.23% | 1 | 0.50% |
| Kirill Smelkov | 12 | 0.23% | 2 | 1.00% |
| Paul Mundt | 11 | 0.21% | 1 | 0.50% |
| Manjunath Goudar | 11 | 0.21% | 1 | 0.50% |
| Julie Zhu | 11 | 0.21% | 1 | 0.50% |
| Greg Kroah-Hartman | 10 | 0.19% | 7 | 3.50% |
| Srinivas Kandagatla | 9 | 0.17% | 1 | 0.50% |
| Andiry Brienza | 9 | 0.17% | 1 | 0.50% |
| Karsten Wiese | 8 | 0.15% | 1 | 0.50% |
| Ricardo Martins | 8 | 0.15% | 1 | 0.50% |
| Jia-Ju Bai | 7 | 0.13% | 1 | 0.50% |
| Andrea Righi | 6 | 0.11% | 1 | 0.50% |
| Ramneek Mehresh | 5 | 0.10% | 1 | 0.50% |
| Eric Lescouet | 5 | 0.10% | 1 | 0.50% |
| Deepak Saxena | 5 | 0.10% | 1 | 0.50% |
| Gustavo A. R. Silva | 4 | 0.08% | 1 | 0.50% |
| Alex He | 4 | 0.08% | 1 | 0.50% |
| Stephen Hemminger | 3 | 0.06% | 1 | 0.50% |
| Quentin Perret | 3 | 0.06% | 1 | 0.50% |
| Corentin Labbe | 3 | 0.06% | 1 | 0.50% |
| Lei Ming | 3 | 0.06% | 1 | 0.50% |
| Xenia Ragiadakou | 3 | 0.06% | 1 | 0.50% |
| William Wu | 3 | 0.06% | 1 | 0.50% |
| Tejun Heo | 2 | 0.04% | 1 | 0.50% |
| Christoph Hellwig | 2 | 0.04% | 1 | 0.50% |
| Felipe Balbi | 2 | 0.04% | 1 | 0.50% |
| Mika Kukkonen | 1 | 0.02% | 1 | 0.50% |
| Yang Hongyang | 1 | 0.02% | 1 | 0.50% |
| Alexey Dobriyan | 1 | 0.02% | 1 | 0.50% |
| Al Viro | 1 | 0.02% | 1 | 0.50% |
| Romain Perier | 1 | 0.02% | 1 | 0.50% |
| Tudor Laurentiu | 1 | 0.02% | 1 | 0.50% |
| Yoshihiro Shimoda | 1 | 0.02% | 1 | 0.50% |
| Clemens Ladisch | 1 | 0.02% | 1 | 0.50% |
| Rusty Russell | 1 | 0.02% | 1 | 0.50% |
| Aleksey Gorelov | 1 | 0.02% | 1 | 0.50% |
| Total | 5226 | 200 |
// SPDX-License-Identifier: GPL-2.0+ /* * Enhanced Host Controller Interface (EHCI) driver for USB. * * Maintainer: Alan Stern <stern@rowland.harvard.edu> * * Copyright (c) 2000-2004 by David Brownell */ #include <linux/module.h> #include <linux/pci.h> #include <linux/dmapool.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/vmalloc.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/hrtimer.h> #include <linux/list.h> #include <linux/interrupt.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include <linux/usb/otg.h> #include <linux/moduleparam.h> #include <linux/dma-mapping.h> #include <linux/debugfs.h> #include <linux/slab.h> #include <asm/byteorder.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/unaligned.h> #if defined(CONFIG_PPC_PS3) #include <asm/firmware.h> #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 EHCI_URB_TRACE /* 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 */ /* 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 bool ignore_oc; module_param (ignore_oc, bool, S_IRUGO); MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications"); #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) /*-------------------------------------------------------------------------*/ #include "ehci.h" #include "pci-quirks.h" static void compute_tt_budget(u8 budget_table[EHCI_BANDWIDTH_SIZE], struct ehci_tt *tt); /* * The MosChip MCS9990 controller updates its microframe counter * a little before the frame counter, and occasionally we will read * the invalid intermediate value. Avoid problems by checking the * microframe number (the low-order 3 bits); if they are 0 then * re-read the register to get the correct value. */ static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci) { unsigned uf; uf = ehci_readl(ehci, &ehci->regs->frame_index); if (unlikely((uf & 7) == 0)) uf = ehci_readl(ehci, &ehci->regs->frame_index); return uf; } static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci) { if (ehci->frame_index_bug) return ehci_moschip_read_frame_index(ehci); return ehci_readl(ehci, &ehci->regs->frame_index); } #include "ehci-dbg.c" /*-------------------------------------------------------------------------*/ /* * ehci_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. */ int ehci_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; } EXPORT_SYMBOL_GPL(ehci_handshake); /* check TDI/ARC silicon is in host mode */ static int tdi_in_host_mode (struct ehci_hcd *ehci) { u32 tmp; tmp = ehci_readl(ehci, &ehci->regs->usbmode); return (tmp & 3) == USBMODE_CM_HC; } /* * Force HC to halt state from unknown (EHCI spec section 2.3). * Must be called with interrupts enabled and the lock not held. */ static int ehci_halt (struct ehci_hcd *ehci) { u32 temp; spin_lock_irq(&ehci->lock); /* 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)) { spin_unlock_irq(&ehci->lock); return 0; } /* * This routine gets called during probe before ehci->command * has been initialized, so we can't rely on its value. */ ehci->command &= ~CMD_RUN; temp = ehci_readl(ehci, &ehci->regs->command); temp &= ~(CMD_RUN | CMD_IAAD); ehci_writel(ehci, temp, &ehci->regs->command); spin_unlock_irq(&ehci->lock); synchronize_irq(ehci_to_hcd(ehci)->irq); return ehci_handshake(ehci, &ehci->regs->status, STS_HALT, STS_HALT, 16 * 125); } /* put TDI/ARC silicon into EHCI mode */ static void tdi_reset (struct ehci_hcd *ehci) { u32 tmp; tmp = ehci_readl(ehci, &ehci->regs->usbmode); 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, &ehci->regs->usbmode); } /* * Reset a non-running (STS_HALT == 1) controller. * Must be called with interrupts enabled and the lock not held. */ 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_to_hcd(ehci))) 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 = ehci_handshake(ehci, &ehci->regs->command, CMD_RESET, 0, 250 * 1000); if (ehci->has_hostpc) { ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS, &ehci->regs->usbmode_ex); ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning); } if (retval) return retval; if (ehci_is_TDI(ehci)) tdi_reset (ehci); if (ehci->debug) dbgp_external_startup(ehci_to_hcd(ehci)); ehci->port_c_suspend = ehci->suspended_ports = ehci->resuming_ports = 0; return retval; } EXPORT_SYMBOL_GPL(ehci_reset); /* * Idle the controller (turn off the schedules). * Must be called with interrupts enabled and the lock not held. */ static void ehci_quiesce (struct ehci_hcd *ehci) { u32 temp; if (ehci->rh_state != EHCI_RH_RUNNING) return; /* wait for any schedule enables/disables to take effect */ temp = (ehci->command << 10) & (STS_ASS | STS_PSS); ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp, 16 * 125); /* then disable anything that's still active */ spin_lock_irq(&ehci->lock); ehci->command &= ~(CMD_ASE | CMD_PSE); ehci_writel(ehci, ehci->command, &ehci->regs->command); spin_unlock_irq(&ehci->lock); /* hardware can take 16 microframes to turn off ... */ ehci_handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0, 16 * 125); } /*-------------------------------------------------------------------------*/ static void end_iaa_cycle(struct ehci_hcd *ehci); static void end_unlink_async(struct ehci_hcd *ehci); static void unlink_empty_async(struct ehci_hcd *ehci); static void ehci_work(struct ehci_hcd *ehci); static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh); static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh); static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable); #include "ehci-timer.c" #include "ehci-hub.c" #include "ehci-mem.c" #include "ehci-q.c" #include "ehci-sched.c" #include "ehci-sysfs.c" /*-------------------------------------------------------------------------*/ /* 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--) { spin_unlock_irq(&ehci->lock); ehci_port_power(ehci, port, false); spin_lock_irq(&ehci->lock); 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. * Must be called with interrupts enabled and the lock not held. */ static void ehci_silence_controller(struct ehci_hcd *ehci) { ehci_halt(ehci); spin_lock_irq(&ehci->lock); ehci->rh_state = EHCI_RH_HALTED; 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); spin_unlock_irq(&ehci->lock); } /* 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); /** * Protect the system from crashing at system shutdown in cases where * usb host is not added yet from OTG controller driver. * As ehci_setup() not done yet, so stop accessing registers or * variables initialized in ehci_setup() */ if (!ehci->sbrn) return; spin_lock_irq(&ehci->lock); ehci->shutdown = true; ehci->rh_state = EHCI_RH_STOPPING; ehci->enabled_hrtimer_events = 0; spin_unlock_irq(&ehci->lock); ehci_silence_controller(ehci); hrtimer_cancel(&ehci->hrtimer); } /*-------------------------------------------------------------------------*/ /* * 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) { /* 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) { ehci->need_rescan = true; return; } ehci->scanning = true; rescan: ehci->need_rescan = false; if (ehci->async_count) scan_async(ehci); if (ehci->intr_count > 0) scan_intr(ehci); if (ehci->isoc_count > 0) scan_isoc(ehci); if (ehci->need_rescan) goto rescan; ehci->scanning = false; /* 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. */ turn_on_io_watchdog(ehci); } /* * 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 ... */ spin_lock_irq(&ehci->lock); ehci->enabled_hrtimer_events = 0; spin_unlock_irq(&ehci->lock); ehci_quiesce(ehci); ehci_silence_controller(ehci); ehci_reset (ehci); hrtimer_cancel(&ehci->hrtimer); remove_sysfs_files(ehci); remove_debug_files (ehci); /* root hub is shut down separately (first, when possible) */ spin_lock_irq (&ehci->lock); end_free_itds(ehci); spin_unlock_irq (&ehci->lock); ehci_mem_cleanup (ehci); if (ehci->amd_pll_fix == 1) usb_amd_dev_put(); 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; hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); ehci->hrtimer.function = ehci_hrtimer_func; ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT; 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->async_unlink); INIT_LIST_HEAD(&ehci->async_idle); INIT_LIST_HEAD(&ehci->intr_unlink_wait); INIT_LIST_HEAD(&ehci->intr_unlink); INIT_LIST_HEAD(&ehci->intr_qh_list); INIT_LIST_HEAD(&ehci->cached_itd_list); INIT_LIST_HEAD(&ehci->cached_sitd_list); INIT_LIST_HEAD(&ehci->tt_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 = 0; else // N microframes cached ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params); /* * 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); #if defined(CONFIG_PPC_PS3) hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE); #endif 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); } ehci->command = temp; /* Accept arbitrarily long scatter-gather lists */ if (!hcd->localmem_pool) hcd->self.sg_tablesize = ~0; /* Prepare for unlinking active QHs */ ehci->old_current = ~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. * dma_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 dev->dma_mask, 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; } int 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; /* data structure init */ retval = ehci_init(hcd); if (retval) return retval; retval = ehci_halt(ehci); if (retval) { ehci_mem_cleanup(ehci); return retval; } ehci_reset(ehci); return 0; } EXPORT_SYMBOL_GPL(ehci_setup); /*-------------------------------------------------------------------------*/ 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; unsigned long flags; /* * For threadirqs option we use spin_lock_irqsave() variant to prevent * deadlock with ehci hrtimer callback, because hrtimer callbacks run * in interrupt context even when threadirqs is specified. We can go * back to spin_lock() variant when hrtimer callbacks become threaded. */ spin_lock_irqsave(&ehci->lock, flags); status = ehci_readl(ehci, &ehci->regs->status); /* e.g. cardbus physical eject */ if (status == ~(u32) 0) { ehci_dbg (ehci, "device removed\n"); goto dead; } /* * We don't use STS_FLR, but some controllers don't like it to * remain on, so mask it out along with the other status bits. */ masked_status = status & (INTR_MASK | STS_FLR); /* Shared IRQ? */ if (!masked_status || unlikely(ehci->rh_state == EHCI_RH_HALTED)) { spin_unlock_irqrestore(&ehci->lock, flags); return IRQ_NONE; } /* clear (just) interrupts */ ehci_writel(ehci, masked_status, &ehci->regs->status); cmd = ehci_readl(ehci, &ehci->regs->command); bh = 0; /* 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)) INCR(ehci->stats.normal); else INCR(ehci->stats.error); bh = 1; } /* complete the unlinking of some qh [4.15.2.3] */ if (status & STS_IAA) { /* Turn off the IAA watchdog */ ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG); /* * Mild optimization: Allow another IAAD to reset the * hrtimer, if one occurs before the next expiration. * In theory we could always cancel the hrtimer, but * tests show that about half the time it will be reset * for some other event anyway. */ if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG) ++ehci->next_hrtimer_event; /* guard against (alleged) silicon errata */ if (cmd & CMD_IAAD) ehci_dbg(ehci, "IAA with IAAD still set?\n"); if (ehci->iaa_in_progress) INCR(ehci->stats.iaa); end_iaa_cycle(ehci); } /* 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 (ehci->rh_state == EHCI_RH_SUSPENDED) 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 (!(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 USB_RESUME_TIMEOUT msec resume signaling from * this port, and make hub_wq collect * PORT_STAT_C_SUSPEND to stop that signaling. */ ehci->reset_done[i] = jiffies + msecs_to_jiffies(USB_RESUME_TIMEOUT); set_bit(i, &ehci->resuming_ports); ehci_dbg (ehci, "port %d remote wakeup\n", i + 1); usb_hcd_start_port_resume(&hcd->self, i); 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); dead: usb_hc_died(hcd); /* Don't let the controller do anything more */ ehci->shutdown = true; ehci->rh_state = EHCI_RH_STOPPING; ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE); ehci_writel(ehci, ehci->command, &ehci->regs->command); ehci_writel(ehci, 0, &ehci->regs->intr_enable); ehci_handle_controller_death(ehci); /* Handle completions when the controller stops */ bh = 0; } if (bh) ehci_work (ehci); spin_unlock_irqrestore(&ehci->lock, flags); 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); } } /* 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; if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { /* * We don't expedite dequeue for isochronous URBs. * Just wait until they complete normally or their * time slot expires. */ } else { qh = (struct ehci_qh *) urb->hcpriv; qh->unlink_reason |= QH_UNLINK_REQUESTED; switch (qh->qh_state) { case QH_STATE_LINKED: if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) start_unlink_intr(ehci, qh); else start_unlink_async(ehci, qh); break; case QH_STATE_COMPLETING: qh->dequeue_during_giveback = 1; 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; } } 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; /* 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) { struct ehci_iso_stream *stream = ep->hcpriv; if (!list_empty(&stream->td_list)) goto idle_timeout; /* BUG_ON(!list_empty(&stream->free_list)); */ reserve_release_iso_bandwidth(ehci, stream, -1); kfree(stream); goto done; } qh->unlink_reason |= QH_UNLINK_REQUESTED; switch (qh->qh_state) { case QH_STATE_LINKED: if (list_empty(&qh->qtd_list)) qh->unlink_reason |= QH_UNLINK_QUEUE_EMPTY; else WARN_ON(1); if (usb_endpoint_type(&ep->desc) != USB_ENDPOINT_XFER_INT) start_unlink_async(ehci, qh); else start_unlink_intr(ehci, qh); fallthrough; case QH_STATE_COMPLETING: /* already in unlinking */ 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)) { if (qh->ps.bw_uperiod) reserve_release_intr_bandwidth(ehci, qh, -1); qh_destroy(ehci, qh); break; } fallthrough; 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; } done: ep->hcpriv = NULL; 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) { if (!list_empty(&qh->qtd_list)) { WARN_ONCE(1, "clear_halt for a busy endpoint\n"); } else { /* The toggle value in the QH can't be updated * while the QH is active. Unlink it now; * re-linking will call qh_refresh(). */ usb_settoggle(qh->ps.udev, epnum, is_out, 0); qh->unlink_reason |= QH_UNLINK_REQUESTED; if (eptype == USB_ENDPOINT_XFER_BULK) start_unlink_async(ehci, qh); else start_unlink_intr(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; } /*-------------------------------------------------------------------------*/ /* Device addition and removal */ static void ehci_remove_device(struct usb_hcd *hcd, struct usb_device *udev) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); spin_lock_irq(&ehci->lock); drop_tt(udev); spin_unlock_irq(&ehci->lock); } /*-------------------------------------------------------------------------*/ #ifdef CONFIG_PM /* suspend/resume, section 4.3 */ /* These routines handle the generic parts of controller suspend/resume */ int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); if (time_before(jiffies, ehci->next_statechange)) msleep(10); /* * Root hub was already suspended. Disable IRQ emission and * mark HW unaccessible. The PM and USB cores make sure that * the root hub is either suspended or stopped. */ ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup); spin_lock_irq(&ehci->lock); ehci_writel(ehci, 0, &ehci->regs->intr_enable); (void) ehci_readl(ehci, &ehci->regs->intr_enable); clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); spin_unlock_irq(&ehci->lock); synchronize_irq(hcd->irq); /* Check for race with a wakeup request */ if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) { ehci_resume(hcd, false); return -EBUSY; } return 0; } EXPORT_SYMBOL_GPL(ehci_suspend); /* Returns 0 if power was preserved, 1 if power was lost */ int ehci_resume(struct usb_hcd *hcd, bool force_reset) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); if (time_before(jiffies, ehci->next_statechange)) msleep(100); /* Mark hardware accessible again as we are back to full power by now */ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); if (ehci->shutdown) return 0; /* Controller is dead */ /* * If CF is still set and reset isn't forced * then we maintained suspend power. * Just undo the effect of ehci_suspend(). */ if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF && !force_reset) { int mask = INTR_MASK; ehci_prepare_ports_for_controller_resume(ehci); spin_lock_irq(&ehci->lock); if (ehci->shutdown) goto skip; if (!hcd->self.root_hub->do_remote_wakeup) mask &= ~STS_PCD; ehci_writel(ehci, mask, &ehci->regs->intr_enable); ehci_readl(ehci, &ehci->regs->intr_enable); skip: spin_unlock_irq(&ehci->lock); return 0; } /* * Else reset, to cope with power loss or resume from hibernation * having let the firmware kick in during reboot. */ usb_root_hub_lost_power(hcd->self.root_hub); (void) ehci_halt(ehci); (void) ehci_reset(ehci); spin_lock_irq(&ehci->lock); if (ehci->shutdown) goto skip; ehci_writel(ehci, ehci->command, &ehci->regs->command); ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ ehci->rh_state = EHCI_RH_SUSPENDED; spin_unlock_irq(&ehci->lock); return 1; } EXPORT_SYMBOL_GPL(ehci_resume); #endif /*-------------------------------------------------------------------------*/ /* * Generic structure: This gets copied for platform drivers so that * individual entries can be overridden as needed. */ static const struct hc_driver ehci_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_DMA | HCD_USB2 | HCD_BH, /* * basic lifecycle operations */ .reset = ehci_setup, .start = ehci_run, .stop = ehci_stop, .shutdown = ehci_shutdown, /* * managing i/o requests and associated device resources */ .urb_enqueue = ehci_urb_enqueue, .urb_dequeue = ehci_urb_dequeue, .endpoint_disable = ehci_endpoint_disable, .endpoint_reset = ehci_endpoint_reset, .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, /* * scheduling support */ .get_frame_number = ehci_get_frame, /* * root hub support */ .hub_status_data = ehci_hub_status_data, .hub_control = ehci_hub_control, .bus_suspend = ehci_bus_suspend, .bus_resume = ehci_bus_resume, .relinquish_port = ehci_relinquish_port, .port_handed_over = ehci_port_handed_over, .get_resuming_ports = ehci_get_resuming_ports, /* * device support */ .free_dev = ehci_remove_device, }; void ehci_init_driver(struct hc_driver *drv, const struct ehci_driver_overrides *over) { /* Copy the generic table to drv and then apply the overrides */ *drv = ehci_hc_driver; if (over) { drv->hcd_priv_size += over->extra_priv_size; if (over->reset) drv->reset = over->reset; if (over->port_power) drv->port_power = over->port_power; } } EXPORT_SYMBOL_GPL(ehci_init_driver); /*-------------------------------------------------------------------------*/ MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR (DRIVER_AUTHOR); MODULE_LICENSE ("GPL"); #ifdef CONFIG_USB_EHCI_SH #include "ehci-sh.c" #define PLATFORM_DRIVER ehci_hcd_sh_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_USB_EHCI_HCD_PMC_MSP #include "ehci-pmcmsp.c" #define PLATFORM_DRIVER ehci_hcd_msp_driver #endif #ifdef CONFIG_SPARC_LEON #include "ehci-grlib.c" #define PLATFORM_DRIVER ehci_grlib_driver #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 CONFIG_DYNAMIC_DEBUG ehci_debug_root = debugfs_create_dir("ehci", usb_debug_root); #endif #ifdef PLATFORM_DRIVER retval = platform_driver_register(&PLATFORM_DRIVER); if (retval < 0) goto clean0; #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 PLATFORM_DRIVER platform_driver_unregister(&PLATFORM_DRIVER); clean0: #endif #ifdef CONFIG_DYNAMIC_DEBUG debugfs_remove(ehci_debug_root); ehci_debug_root = NULL; #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 PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER); #endif #ifdef CONFIG_DYNAMIC_DEBUG debugfs_remove(ehci_debug_root); #endif clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); } module_exit(ehci_hcd_cleanup);
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