| /* |
| * Universal Host Controller Interface driver for USB. |
| * |
| * Maintainer: Alan Stern <stern@rowland.harvard.edu> |
| * |
| * (C) Copyright 1999 Linus Torvalds |
| * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com |
| * (C) Copyright 1999 Randy Dunlap |
| * (C) Copyright 1999 Georg Acher, acher@in.tum.de |
| * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de |
| * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch |
| * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at |
| * (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 2004-2007 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 |
| * people who decided that they want to do the same thing in a |
| * completely different way. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/unistd.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/debugfs.h> |
| #include <linux/pm.h> |
| #include <linux/dmapool.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/usb.h> |
| #include <linux/bitops.h> |
| #include <linux/dmi.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| #include <asm/system.h> |
| |
| #include "../core/hcd.h" |
| #include "uhci-hcd.h" |
| #include "pci-quirks.h" |
| |
| /* |
| * Version Information |
| */ |
| #define DRIVER_AUTHOR "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, \ |
| Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, Roman Weissgaerber, \ |
| Alan Stern" |
| #define DRIVER_DESC "USB Universal Host Controller Interface driver" |
| |
| /* for flakey hardware, ignore overcurrent indicators */ |
| static int ignore_oc; |
| module_param(ignore_oc, bool, S_IRUGO); |
| MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications"); |
| |
| /* |
| * debug = 0, no debugging messages |
| * debug = 1, dump failed URBs except for stalls |
| * debug = 2, dump all failed URBs (including stalls) |
| * show all queues in /debug/uhci/[pci_addr] |
| * debug = 3, show all TDs in URBs when dumping |
| */ |
| #ifdef DEBUG |
| #define DEBUG_CONFIGURED 1 |
| static int debug = 1; |
| module_param(debug, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(debug, "Debug level"); |
| |
| #else |
| #define DEBUG_CONFIGURED 0 |
| #define debug 0 |
| #endif |
| |
| static char *errbuf; |
| #define ERRBUF_LEN (32 * 1024) |
| |
| static struct kmem_cache *uhci_up_cachep; /* urb_priv */ |
| |
| 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); |
| |
| /* |
| * Calculate the link pointer DMA value for the first Skeleton QH in a frame. |
| */ |
| static __le32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame) |
| { |
| int skelnum; |
| |
| /* |
| * The interrupt queues will be interleaved as evenly as possible. |
| * There's not much to be done about period-1 interrupts; they have |
| * to occur in every frame. But we can schedule period-2 interrupts |
| * in odd-numbered frames, period-4 interrupts in frames congruent |
| * to 2 (mod 4), and so on. This way each frame only has two |
| * interrupt QHs, which will help spread out bandwidth utilization. |
| * |
| * ffs (Find First bit Set) does exactly what we need: |
| * 1,3,5,... => ffs = 0 => use period-2 QH = skelqh[8], |
| * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc. |
| * ffs >= 7 => not on any high-period queue, so use |
| * period-1 QH = skelqh[9]. |
| * Add in UHCI_NUMFRAMES to insure at least one bit is set. |
| */ |
| skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES); |
| if (skelnum <= 1) |
| skelnum = 9; |
| return LINK_TO_QH(uhci->skelqh[skelnum]); |
| } |
| |
| #include "uhci-debug.c" |
| #include "uhci-q.c" |
| #include "uhci-hub.c" |
| |
| /* |
| * Finish up a host controller reset and update the recorded state. |
| */ |
| static void finish_reset(struct uhci_hcd *uhci) |
| { |
| int port; |
| |
| /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect |
| * bits in the port status and control registers. |
| * We have to clear them by hand. |
| */ |
| for (port = 0; port < uhci->rh_numports; ++port) |
| outw(0, uhci->io_addr + USBPORTSC1 + (port * 2)); |
| |
| uhci->port_c_suspend = uhci->resuming_ports = 0; |
| uhci->rh_state = UHCI_RH_RESET; |
| 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 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->dead = 1; |
| |
| /* The current frame may already be partway finished */ |
| ++uhci->frame_number; |
| } |
| |
| /* |
| * 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) |
| { |
| if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr)) |
| finish_reset(uhci); |
| } |
| |
| /* |
| * Store the basic register settings needed by the controller. |
| */ |
| static void configure_hc(struct uhci_hcd *uhci) |
| { |
| /* Set the frame length to the default: 1 ms exactly */ |
| outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF); |
| |
| /* Store the frame list base address */ |
| outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD); |
| |
| /* Set the current frame number */ |
| 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; |
| mb(); |
| |
| /* Enable PIRQ */ |
| pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, |
| USBLEGSUP_DEFAULT); |
| } |
| |
| |
| static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci) |
| { |
| int port; |
| |
| /* If we have to ignore overcurrent events then almost by definition |
| * we can't depend on resume-detect interrupts. */ |
| if (ignore_oc) |
| return 1; |
| |
| switch (to_pci_dev(uhci_dev(uhci))->vendor) { |
| default: |
| break; |
| |
| case PCI_VENDOR_ID_GENESYS: |
| /* Genesys Logic's GL880S controllers don't generate |
| * resume-detect interrupts. |
| */ |
| return 1; |
| |
| case PCI_VENDOR_ID_INTEL: |
| /* Some of Intel's USB controllers have a bug that causes |
| * resume-detect interrupts if any port has an over-current |
| * condition. To make matters worse, some motherboards |
| * hardwire unused USB ports' over-current inputs active! |
| * To prevent problems, we will not enable resume-detect |
| * interrupts if any ports are OC. |
| */ |
| for (port = 0; port < uhci->rh_numports; ++port) { |
| if (inw(uhci->io_addr + USBPORTSC1 + port * 2) & |
| USBPORTSC_OC) |
| return 1; |
| } |
| break; |
| } |
| return 0; |
| } |
| |
| static int global_suspend_mode_is_broken(struct uhci_hcd *uhci) |
| { |
| int port; |
| const char *sys_info; |
| static char bad_Asus_board[] = "A7V8X"; |
| |
| /* One of Asus's motherboards has a bug which causes it to |
| * wake up immediately from suspend-to-RAM if any of the ports |
| * are connected. In such cases we will not set EGSM. |
| */ |
| sys_info = dmi_get_system_info(DMI_BOARD_NAME); |
| if (sys_info && !strcmp(sys_info, bad_Asus_board)) { |
| for (port = 0; port < uhci->rh_numports; ++port) { |
| if (inw(uhci->io_addr + USBPORTSC1 + port * 2) & |
| USBPORTSC_CCS) |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state) |
| __releases(uhci->lock) |
| __acquires(uhci->lock) |
| { |
| int auto_stop; |
| int int_enable, egsm_enable, wakeup_enable; |
| struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub; |
| |
| auto_stop = (new_state == UHCI_RH_AUTO_STOPPED); |
| dev_dbg(&rhdev->dev, "%s%s\n", __func__, |
| (auto_stop ? " (auto-stop)" : "")); |
| |
| /* Start off by assuming Resume-Detect interrupts and EGSM work |
| * and that remote wakeups should be enabled. |
| */ |
| egsm_enable = USBCMD_EGSM; |
| uhci->RD_enable = 1; |
| int_enable = USBINTR_RESUME; |
| wakeup_enable = 1; |
| |
| /* In auto-stop mode wakeups must always be detected, but |
| * Resume-Detect interrupts may be prohibited. (In the absence |
| * of CONFIG_PM, they are always disallowed.) |
| */ |
| if (auto_stop) { |
| if (!device_may_wakeup(&rhdev->dev)) |
| int_enable = 0; |
| |
| /* In bus-suspend mode wakeups may be disabled, but if they are |
| * allowed then so are Resume-Detect interrupts. |
| */ |
| } else { |
| #ifdef CONFIG_PM |
| if (!rhdev->do_remote_wakeup) |
| wakeup_enable = 0; |
| #endif |
| } |
| |
| /* EGSM causes the root hub to echo a 'K' signal (resume) out any |
| * port which requests a remote wakeup. According to the USB spec, |
| * every hub is supposed to do this. But if we are ignoring |
| * remote-wakeup requests anyway then there's no point to it. |
| * We also shouldn't enable EGSM if it's broken. |
| */ |
| if (!wakeup_enable || global_suspend_mode_is_broken(uhci)) |
| egsm_enable = 0; |
| |
| /* If we're ignoring wakeup events then there's no reason to |
| * enable Resume-Detect interrupts. We also shouldn't enable |
| * them if they are broken or disallowed. |
| * |
| * This logic may lead us to enabling RD but not EGSM. The UHCI |
| * spec foolishly says that RD works only when EGSM is on, but |
| * there's no harm in enabling it anyway -- perhaps some chips |
| * will implement it! |
| */ |
| if (!wakeup_enable || resume_detect_interrupts_are_broken(uhci) || |
| !int_enable) |
| uhci->RD_enable = int_enable = 0; |
| |
| outw(int_enable, uhci->io_addr + USBINTR); |
| outw(egsm_enable | USBCMD_CF, uhci->io_addr + USBCMD); |
| mb(); |
| udelay(5); |
| |
| /* If we're auto-stopping then no devices have been attached |
| * for a while, so there shouldn't be any active URBs and the |
| * controller should stop after a few microseconds. Otherwise |
| * we will give the controller one frame to stop. |
| */ |
| if (!auto_stop && !(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) { |
| uhci->rh_state = UHCI_RH_SUSPENDING; |
| spin_unlock_irq(&uhci->lock); |
| msleep(1); |
| spin_lock_irq(&uhci->lock); |
| if (uhci->dead) |
| return; |
| } |
| if (!(inw(uhci->io_addr + USBSTS) & USBSTS_HCH)) |
| dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n"); |
| |
| uhci_get_current_frame_number(uhci); |
| |
| uhci->rh_state = new_state; |
| uhci->is_stopped = UHCI_IS_STOPPED; |
| |
| /* If interrupts don't work and remote wakeup is enabled then |
| * the suspended root hub needs to be polled. |
| */ |
| uhci_to_hcd(uhci)->poll_rh = (!int_enable && wakeup_enable); |
| |
| uhci_scan_schedule(uhci); |
| uhci_fsbr_off(uhci); |
| } |
| |
| static void start_rh(struct uhci_hcd *uhci) |
| { |
| uhci_to_hcd(uhci)->state = HC_STATE_RUNNING; |
| uhci->is_stopped = 0; |
| |
| /* Mark it configured and running with a 64-byte max packet. |
| * All interrupts are enabled, even though RESUME won't do anything. |
| */ |
| outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, uhci->io_addr + USBCMD); |
| outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP, |
| uhci->io_addr + USBINTR); |
| mb(); |
| uhci->rh_state = UHCI_RH_RUNNING; |
| uhci_to_hcd(uhci)->poll_rh = 1; |
| } |
| |
| static void wakeup_rh(struct uhci_hcd *uhci) |
| __releases(uhci->lock) |
| __acquires(uhci->lock) |
| { |
| dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev, |
| "%s%s\n", __func__, |
| uhci->rh_state == UHCI_RH_AUTO_STOPPED ? |
| " (auto-start)" : ""); |
| |
| /* If we are auto-stopped then no devices are attached so there's |
| * no need for wakeup signals. Otherwise we send Global Resume |
| * for 20 ms. |
| */ |
| if (uhci->rh_state == UHCI_RH_SUSPENDED) { |
| unsigned egsm; |
| |
| /* Keep EGSM on if it was set before */ |
| egsm = inw(uhci->io_addr + USBCMD) & USBCMD_EGSM; |
| uhci->rh_state = UHCI_RH_RESUMING; |
| outw(USBCMD_FGR | USBCMD_CF | egsm, uhci->io_addr + USBCMD); |
| spin_unlock_irq(&uhci->lock); |
| msleep(20); |
| spin_lock_irq(&uhci->lock); |
| if (uhci->dead) |
| return; |
| |
| /* End Global Resume and wait for EOP to be sent */ |
| outw(USBCMD_CF, uhci->io_addr + USBCMD); |
| mb(); |
| udelay(4); |
| if (inw(uhci->io_addr + USBCMD) & USBCMD_FGR) |
| dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n"); |
| } |
| |
| start_rh(uhci); |
| |
| /* Restart root hub polling */ |
| mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies); |
| } |
| |
| static irqreturn_t uhci_irq(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| unsigned short status; |
| |
| /* |
| * Read the interrupt status, and write it back to clear the |
| * interrupt cause. Contrary to the UHCI specification, the |
| * "HC Halted" status bit is persistent: it is RO, not R/WC. |
| */ |
| status = inw(uhci->io_addr + USBSTS); |
| if (!(status & ~USBSTS_HCH)) /* shared interrupt, not mine */ |
| return IRQ_NONE; |
| outw(status, uhci->io_addr + USBSTS); /* Clear it */ |
| |
| if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) { |
| if (status & USBSTS_HSE) |
| dev_err(uhci_dev(uhci), "host system error, " |
| "PCI problems?\n"); |
| if (status & USBSTS_HCPE) |
| dev_err(uhci_dev(uhci), "host controller process " |
| "error, something bad happened!\n"); |
| if (status & USBSTS_HCH) { |
| spin_lock(&uhci->lock); |
| if (uhci->rh_state >= UHCI_RH_RUNNING) { |
| dev_err(uhci_dev(uhci), |
| "host controller halted, " |
| "very bad!\n"); |
| if (debug > 1 && errbuf) { |
| /* Print the schedule for debugging */ |
| uhci_sprint_schedule(uhci, |
| errbuf, ERRBUF_LEN); |
| lprintk(errbuf); |
| } |
| uhci_hc_died(uhci); |
| |
| /* Force a callback in case there are |
| * pending unlinks */ |
| mod_timer(&hcd->rh_timer, jiffies); |
| } |
| spin_unlock(&uhci->lock); |
| } |
| } |
| |
| if (status & USBSTS_RD) |
| usb_hcd_poll_rh_status(hcd); |
| else { |
| spin_lock(&uhci->lock); |
| uhci_scan_schedule(uhci); |
| spin_unlock(&uhci->lock); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Store the current frame number in uhci->frame_number if the controller |
| * 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) { |
| unsigned delta; |
| |
| delta = (inw(uhci->io_addr + USBFRNUM) - uhci->frame_number) & |
| (UHCI_NUMFRAMES - 1); |
| uhci->frame_number += delta; |
| } |
| } |
| |
| /* |
| * De-allocate all resources |
| */ |
| static void release_uhci(struct uhci_hcd *uhci) |
| { |
| int i; |
| |
| if (DEBUG_CONFIGURED) { |
| spin_lock_irq(&uhci->lock); |
| uhci->is_initialized = 0; |
| spin_unlock_irq(&uhci->lock); |
| |
| debugfs_remove(uhci->dentry); |
| } |
| |
| for (i = 0; i < UHCI_NUM_SKELQH; i++) |
| uhci_free_qh(uhci, uhci->skelqh[i]); |
| |
| uhci_free_td(uhci, uhci->term_td); |
| |
| dma_pool_destroy(uhci->qh_pool); |
| |
| dma_pool_destroy(uhci->td_pool); |
| |
| kfree(uhci->frame_cpu); |
| |
| dma_free_coherent(uhci_dev(uhci), |
| UHCI_NUMFRAMES * sizeof(*uhci->frame), |
| uhci->frame, uhci->frame_dma_handle); |
| } |
| |
| static int uhci_init(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| unsigned io_size = (unsigned) hcd->rsrc_len; |
| int port; |
| |
| uhci->io_addr = (unsigned long) hcd->rsrc_start; |
| |
| /* The UHCI spec says devices must have 2 ports, and goes on to say |
| * they may have more but gives no way to determine how many there |
| * are. However according to the UHCI spec, Bit 7 of the port |
| * status and control register is always set to 1. So we try to |
| * use this to our advantage. Another common failure mode when |
| * a nonexistent register is addressed is to return all ones, so |
| * we test for that also. |
| */ |
| for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) { |
| unsigned int portstatus; |
| |
| portstatus = inw(uhci->io_addr + USBPORTSC1 + (port * 2)); |
| if (!(portstatus & 0x0080) || portstatus == 0xffff) |
| break; |
| } |
| if (debug) |
| dev_info(uhci_dev(uhci), "detected %d ports\n", port); |
| |
| /* Anything greater than 7 is weird so we'll ignore it. */ |
| if (port > UHCI_RH_MAXCHILD) { |
| dev_info(uhci_dev(uhci), "port count misdetected? " |
| "forcing to 2 ports\n"); |
| port = 2; |
| } |
| uhci->rh_numports = port; |
| |
| /* Kick BIOS off this hardware and reset if the controller |
| * isn't already safely quiescent. |
| */ |
| check_and_reset_hc(uhci); |
| return 0; |
| } |
| |
| /* Make sure the controller is quiescent and that we're not using it |
| * any more. This is mainly for the benefit of programs which, like kexec, |
| * expect the hardware to be idle: not doing DMA or generating IRQs. |
| * |
| * This routine may be called in a damaged or failing kernel. Hence we |
| * do not acquire the spinlock before shutting down the controller. |
| */ |
| static void uhci_shutdown(struct pci_dev *pdev) |
| { |
| struct usb_hcd *hcd = (struct usb_hcd *) pci_get_drvdata(pdev); |
| |
| uhci_hc_died(hcd_to_uhci(hcd)); |
| } |
| |
| /* |
| * Allocate a frame list, and then setup the skeleton |
| * |
| * The hardware doesn't really know any difference |
| * in the queues, but the order does matter for the |
| * protocols higher up. The order in which the queues |
| * are encountered by the hardware is: |
| * |
| * - All isochronous events are handled before any |
| * of the queues. We don't do that here, because |
| * we'll create the actual TD entries on demand. |
| * - The first queue is the high-period interrupt queue. |
| * - The second queue is the period-1 interrupt and async |
| * (low-speed control, full-speed control, then bulk) queue. |
| * - The third queue is the terminating bandwidth reclamation queue, |
| * which contains no members, loops back to itself, and is present |
| * only when FSBR is on and there are no full-speed control or bulk QHs. |
| */ |
| static int uhci_start(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| int retval = -EBUSY; |
| int i; |
| struct dentry *dentry; |
| |
| hcd->uses_new_polling = 1; |
| |
| spin_lock_init(&uhci->lock); |
| 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) { |
| dentry = debugfs_create_file(hcd->self.bus_name, |
| S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root, |
| uhci, &uhci_debug_operations); |
| if (!dentry) { |
| dev_err(uhci_dev(uhci), "couldn't create uhci " |
| "debugfs entry\n"); |
| retval = -ENOMEM; |
| goto err_create_debug_entry; |
| } |
| uhci->dentry = dentry; |
| } |
| |
| uhci->frame = dma_alloc_coherent(uhci_dev(uhci), |
| UHCI_NUMFRAMES * sizeof(*uhci->frame), |
| &uhci->frame_dma_handle, 0); |
| if (!uhci->frame) { |
| dev_err(uhci_dev(uhci), "unable to allocate " |
| "consistent memory for frame list\n"); |
| goto err_alloc_frame; |
| } |
| memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame)); |
| |
| uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu), |
| GFP_KERNEL); |
| if (!uhci->frame_cpu) { |
| dev_err(uhci_dev(uhci), "unable to allocate " |
| "memory for frame pointers\n"); |
| goto err_alloc_frame_cpu; |
| } |
| |
| uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci), |
| sizeof(struct uhci_td), 16, 0); |
| if (!uhci->td_pool) { |
| dev_err(uhci_dev(uhci), "unable to create td dma_pool\n"); |
| goto err_create_td_pool; |
| } |
| |
| uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci), |
| sizeof(struct uhci_qh), 16, 0); |
| if (!uhci->qh_pool) { |
| dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n"); |
| goto err_create_qh_pool; |
| } |
| |
| uhci->term_td = uhci_alloc_td(uhci); |
| if (!uhci->term_td) { |
| dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n"); |
| goto err_alloc_term_td; |
| } |
| |
| for (i = 0; i < UHCI_NUM_SKELQH; i++) { |
| uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL); |
| if (!uhci->skelqh[i]) { |
| dev_err(uhci_dev(uhci), "unable to allocate QH\n"); |
| goto err_alloc_skelqh; |
| } |
| } |
| |
| /* |
| * 8 Interrupt queues; link all higher int queues to int1 = async |
| */ |
| for (i = SKEL_ISO + 1; i < SKEL_ASYNC; ++i) |
| uhci->skelqh[i]->link = LINK_TO_QH(uhci->skel_async_qh); |
| uhci->skel_async_qh->link = UHCI_PTR_TERM; |
| uhci->skel_term_qh->link = LINK_TO_QH(uhci->skel_term_qh); |
| |
| /* This dummy TD is to work around a bug in Intel PIIX controllers */ |
| uhci_fill_td(uhci->term_td, 0, uhci_explen(0) | |
| (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0); |
| uhci->term_td->link = UHCI_PTR_TERM; |
| uhci->skel_async_qh->element = uhci->skel_term_qh->element = |
| LINK_TO_TD(uhci->term_td); |
| |
| /* |
| * Fill the frame list: make all entries point to the proper |
| * interrupt queue. |
| */ |
| for (i = 0; i < UHCI_NUMFRAMES; i++) { |
| |
| /* Only place we don't use the frame list routines */ |
| uhci->frame[i] = uhci_frame_skel_link(uhci, i); |
| } |
| |
| /* |
| * Some architectures require a full mb() to enforce completion of |
| * the memory writes above before the I/O transfers in configure_hc(). |
| */ |
| mb(); |
| |
| configure_hc(uhci); |
| uhci->is_initialized = 1; |
| start_rh(uhci); |
| return 0; |
| |
| /* |
| * error exits: |
| */ |
| err_alloc_skelqh: |
| for (i = 0; i < UHCI_NUM_SKELQH; i++) { |
| if (uhci->skelqh[i]) |
| uhci_free_qh(uhci, uhci->skelqh[i]); |
| } |
| |
| uhci_free_td(uhci, uhci->term_td); |
| |
| err_alloc_term_td: |
| dma_pool_destroy(uhci->qh_pool); |
| |
| err_create_qh_pool: |
| dma_pool_destroy(uhci->td_pool); |
| |
| err_create_td_pool: |
| kfree(uhci->frame_cpu); |
| |
| err_alloc_frame_cpu: |
| dma_free_coherent(uhci_dev(uhci), |
| UHCI_NUMFRAMES * sizeof(*uhci->frame), |
| uhci->frame, uhci->frame_dma_handle); |
| |
| err_alloc_frame: |
| debugfs_remove(uhci->dentry); |
| |
| err_create_debug_entry: |
| return retval; |
| } |
| |
| static void uhci_stop(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| |
| spin_lock_irq(&uhci->lock); |
| if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead) |
| uhci_hc_died(uhci); |
| uhci_scan_schedule(uhci); |
| spin_unlock_irq(&uhci->lock); |
| |
| del_timer_sync(&uhci->fsbr_timer); |
| release_uhci(uhci); |
| } |
| |
| #ifdef CONFIG_PM |
| 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 (!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 rc; |
| } |
| |
| static int uhci_rh_resume(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| int rc = 0; |
| |
| spin_lock_irq(&uhci->lock); |
| if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) |
| rc = -ESHUTDOWN; |
| else if (!uhci->dead) |
| wakeup_rh(uhci); |
| spin_unlock_irq(&uhci->lock); |
| return rc; |
| } |
| |
| static int uhci_pci_suspend(struct usb_hcd *hcd, pm_message_t message) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| int rc = 0; |
| |
| dev_dbg(uhci_dev(uhci), "%s\n", __func__); |
| |
| spin_lock_irq(&uhci->lock); |
| 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"); |
| rc = -EBUSY; |
| goto done; |
| }; |
| |
| /* All PCI host controllers are required to disable IRQ generation |
| * at the source, so we must turn off PIRQ. |
| */ |
| pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0); |
| mb(); |
| hcd->poll_rh = 0; |
| |
| /* FIXME: Enable non-PME# remote wakeup? */ |
| |
| /* make sure snapshot being resumed re-enumerates everything */ |
| if (message.event == PM_EVENT_PRETHAW) |
| uhci_hc_died(uhci); |
| |
| done_okay: |
| clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| done: |
| spin_unlock_irq(&uhci->lock); |
| return rc; |
| } |
| |
| static int uhci_pci_resume(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| |
| dev_dbg(uhci_dev(uhci), "%s\n", __func__); |
| |
| /* Since we aren't in D3 any more, it's safe to set this flag |
| * even if the controller was dead. |
| */ |
| set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
| mb(); |
| |
| spin_lock_irq(&uhci->lock); |
| |
| /* FIXME: Disable non-PME# remote wakeup? */ |
| |
| /* 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) { |
| |
| /* The controller had to be reset */ |
| usb_root_hub_lost_power(hcd->self.root_hub); |
| suspend_rh(uhci, UHCI_RH_SUSPENDED); |
| } |
| |
| spin_unlock_irq(&uhci->lock); |
| |
| /* If interrupts don't work and remote wakeup is enabled then |
| * the suspended root hub needs to be polled. |
| */ |
| if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) { |
| hcd->poll_rh = 1; |
| usb_hcd_poll_rh_status(hcd); |
| } |
| return 0; |
| } |
| #endif |
| |
| /* Wait until a particular device/endpoint's QH is idle, and free it */ |
| static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd, |
| struct usb_host_endpoint *hep) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| struct uhci_qh *qh; |
| |
| spin_lock_irq(&uhci->lock); |
| qh = (struct uhci_qh *) hep->hcpriv; |
| if (qh == NULL) |
| goto done; |
| |
| while (qh->state != QH_STATE_IDLE) { |
| ++uhci->num_waiting; |
| spin_unlock_irq(&uhci->lock); |
| wait_event_interruptible(uhci->waitqh, |
| qh->state == QH_STATE_IDLE); |
| spin_lock_irq(&uhci->lock); |
| --uhci->num_waiting; |
| } |
| |
| uhci_free_qh(uhci, qh); |
| done: |
| spin_unlock_irq(&uhci->lock); |
| } |
| |
| static int uhci_hcd_get_frame_number(struct usb_hcd *hcd) |
| { |
| struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| unsigned frame_number; |
| unsigned delta; |
| |
| /* Minimize latency by avoiding the spinlock */ |
| 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"; |
| |
| static const struct hc_driver uhci_driver = { |
| .description = hcd_name, |
| .product_desc = "UHCI Host Controller", |
| .hcd_priv_size = sizeof(struct uhci_hcd), |
| |
| /* Generic hardware linkage */ |
| .irq = uhci_irq, |
| .flags = HCD_USB11, |
| |
| /* Basic lifecycle operations */ |
| .reset = uhci_init, |
| .start = uhci_start, |
| #ifdef CONFIG_PM |
| .pci_suspend = uhci_pci_suspend, |
| .pci_resume = uhci_pci_resume, |
| .bus_suspend = uhci_rh_suspend, |
| .bus_resume = uhci_rh_resume, |
| #endif |
| .stop = uhci_stop, |
| |
| .urb_enqueue = uhci_urb_enqueue, |
| .urb_dequeue = uhci_urb_dequeue, |
| |
| .endpoint_disable = uhci_hcd_endpoint_disable, |
| .get_frame_number = uhci_hcd_get_frame_number, |
| |
| .hub_status_data = uhci_hub_status_data, |
| .hub_control = uhci_hub_control, |
| }; |
| |
| static const struct pci_device_id uhci_pci_ids[] = { { |
| /* handle any USB UHCI controller */ |
| PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0), |
| .driver_data = (unsigned long) &uhci_driver, |
| }, { /* end: all zeroes */ } |
| }; |
| |
| MODULE_DEVICE_TABLE(pci, uhci_pci_ids); |
| |
| static struct pci_driver uhci_pci_driver = { |
| .name = (char *)hcd_name, |
| .id_table = uhci_pci_ids, |
| |
| .probe = usb_hcd_pci_probe, |
| .remove = usb_hcd_pci_remove, |
| .shutdown = uhci_shutdown, |
| |
| #ifdef CONFIG_PM |
| .suspend = usb_hcd_pci_suspend, |
| .resume = usb_hcd_pci_resume, |
| #endif /* PM */ |
| }; |
| |
| static int __init uhci_hcd_init(void) |
| { |
| int retval = -ENOMEM; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n", |
| ignore_oc ? ", overcurrent ignored" : ""); |
| set_bit(USB_UHCI_LOADED, &usb_hcds_loaded); |
| |
| if (DEBUG_CONFIGURED) { |
| errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL); |
| if (!errbuf) |
| goto errbuf_failed; |
| uhci_debugfs_root = debugfs_create_dir("uhci", NULL); |
| if (!uhci_debugfs_root) |
| goto debug_failed; |
| } |
| |
| uhci_up_cachep = kmem_cache_create("uhci_urb_priv", |
| sizeof(struct urb_priv), 0, 0, NULL); |
| if (!uhci_up_cachep) |
| goto up_failed; |
| |
| retval = pci_register_driver(&uhci_pci_driver); |
| if (retval) |
| goto init_failed; |
| |
| return 0; |
| |
| init_failed: |
| kmem_cache_destroy(uhci_up_cachep); |
| |
| up_failed: |
| debugfs_remove(uhci_debugfs_root); |
| |
| debug_failed: |
| kfree(errbuf); |
| |
| errbuf_failed: |
| |
| clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded); |
| return retval; |
| } |
| |
| static void __exit uhci_hcd_cleanup(void) |
| { |
| pci_unregister_driver(&uhci_pci_driver); |
| kmem_cache_destroy(uhci_up_cachep); |
| debugfs_remove(uhci_debugfs_root); |
| kfree(errbuf); |
| clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded); |
| } |
| |
| module_init(uhci_hcd_init); |
| module_exit(uhci_hcd_cleanup); |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |