diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.c | 945 |
1 files changed, 945 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c new file mode 100644 index 000000000..6218bfe54 --- /dev/null +++ b/drivers/usb/host/uhci-hcd.c @@ -0,0 +1,945 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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/usb/hcd.h> +#include <linux/bitops.h> +#include <linux/dmi.h> + +#include <linux/uaccess.h> +#include <asm/io.h> +#include <asm/irq.h> + +#include "uhci-hcd.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 bool 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 /sys/kernel/debug/uhci/[pci_addr] + * debug = 3, show all TDs in URBs when dumping + */ +#ifdef CONFIG_DYNAMIC_DEBUG + +static int debug = 1; +module_param(debug, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Debug level"); +static char *errbuf; + +#else + +#define debug 0 +#define errbuf NULL + +#endif + + +#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 __hc32 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, 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) + uhci_writew(uhci, 0, USBPORTSC1 + (port * 2)); + + uhci->port_c_suspend = uhci->resuming_ports = 0; + uhci->rh_state = UHCI_RH_RESET; + uhci->is_stopped = UHCI_IS_STOPPED; + clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags); +} + +/* + * 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(uhci); + 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(uhci)) + finish_reset(uhci); +} + +#if defined(CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC) +/* + * The two functions below are generic reset functions that are used on systems + * that do not have keyboard and mouse legacy support. We assume that we are + * running on such a system if CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC is defined. + */ + +/* + * Make sure the controller is completely inactive, unable to + * generate interrupts or do DMA. + */ +static void uhci_generic_reset_hc(struct uhci_hcd *uhci) +{ + /* Reset the HC - this will force us to get a + * new notification of any already connected + * ports due to the virtual disconnect that it + * implies. + */ + uhci_writew(uhci, USBCMD_HCRESET, USBCMD); + mb(); + udelay(5); + if (uhci_readw(uhci, USBCMD) & USBCMD_HCRESET) + dev_warn(uhci_dev(uhci), "HCRESET not completed yet!\n"); + + /* Just to be safe, disable interrupt requests and + * make sure the controller is stopped. + */ + uhci_writew(uhci, 0, USBINTR); + uhci_writew(uhci, 0, USBCMD); +} + +/* + * Initialize a controller that was newly discovered or has just been + * resumed. In either case we can't be sure of its previous state. + * + * Returns: 1 if the controller was reset, 0 otherwise. + */ +static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci) +{ + unsigned int cmd, intr; + + /* + * When restarting a suspended controller, we expect all the + * settings to be the same as we left them: + * + * Controller is stopped and configured with EGSM set; + * No interrupts enabled except possibly Resume Detect. + * + * If any of these conditions are violated we do a complete reset. + */ + + cmd = uhci_readw(uhci, USBCMD); + if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) { + dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n", + __func__, cmd); + goto reset_needed; + } + + intr = uhci_readw(uhci, USBINTR); + if (intr & (~USBINTR_RESUME)) { + dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n", + __func__, intr); + goto reset_needed; + } + return 0; + +reset_needed: + dev_dbg(uhci_dev(uhci), "Performing full reset\n"); + uhci_generic_reset_hc(uhci); + return 1; +} +#endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */ + +/* + * 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 */ + uhci_writeb(uhci, USBSOF_DEFAULT, USBSOF); + + /* Store the frame list base address */ + uhci_writel(uhci, uhci->frame_dma_handle, USBFLBASEADD); + + /* Set the current frame number */ + uhci_writew(uhci, uhci->frame_number & UHCI_MAX_SOF_NUMBER, + USBFRNUM); + + /* perform any arch/bus specific configuration */ + if (uhci->configure_hc) + uhci->configure_hc(uhci); +} + +static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci) +{ + /* + * If we have to ignore overcurrent events then almost by definition + * we can't depend on resume-detect interrupts. + * + * Those interrupts also don't seem to work on ASpeed SoCs. + */ + if (ignore_oc || uhci_is_aspeed(uhci)) + return 1; + + return uhci->resume_detect_interrupts_are_broken ? + uhci->resume_detect_interrupts_are_broken(uhci) : 0; +} + +static int global_suspend_mode_is_broken(struct uhci_hcd *uhci) +{ + return uhci->global_suspend_mode_is_broken ? + uhci->global_suspend_mode_is_broken(uhci) : 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; + int_enable = USBINTR_RESUME; + wakeup_enable = 1; + + /* + * In auto-stop mode, we must be able to detect new connections. + * The user can force us to poll by disabling remote wakeup; + * otherwise we will use the EGSM/RD mechanism. + */ + if (auto_stop) { + if (!device_may_wakeup(&rhdev->dev)) + egsm_enable = int_enable = 0; + } + +#ifdef CONFIG_PM + /* + * In bus-suspend mode, we use the wakeup setting specified + * for the root hub. + */ + else { + if (!rhdev->do_remote_wakeup) + wakeup_enable = 0; + } +#endif + + /* + * UHCI doesn't distinguish between wakeup requests from downstream + * devices and local connect/disconnect events. There's no way to + * enable one without the other; both are controlled by EGSM. Thus + * if wakeups are disallowed then EGSM must be turned off -- in which + * case remote wakeup requests from downstream during system sleep + * will be lost. + * + * In addition, if EGSM is broken then we can't use it. Likewise, + * if Resume-Detect interrupts are broken then we can't use them. + * + * Finally, neither EGSM nor RD is useful by itself. Without EGSM, + * the RD status bit will never get set. Without RD, the controller + * won't generate interrupts to tell the system about wakeup events. + */ + if (!wakeup_enable || global_suspend_mode_is_broken(uhci) || + resume_detect_interrupts_are_broken(uhci)) + egsm_enable = int_enable = 0; + + uhci->RD_enable = !!int_enable; + uhci_writew(uhci, int_enable, USBINTR); + uhci_writew(uhci, egsm_enable | USBCMD_CF, 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 && !(uhci_readw(uhci, 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 (!(uhci_readw(uhci, 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 remote wakeup is enabled but either EGSM or RD interrupts + * doesn't work, then we won't get an interrupt when a wakeup event + * occurs. Thus the suspended root hub needs to be polled. + */ + if (wakeup_enable && (!int_enable || !egsm_enable)) + set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags); + else + clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags); + + uhci_scan_schedule(uhci); + uhci_fsbr_off(uhci); +} + +static void start_rh(struct uhci_hcd *uhci) +{ + uhci->is_stopped = 0; + + /* + * Clear stale status bits on Aspeed as we get a stale HCH + * which causes problems later on + */ + if (uhci_is_aspeed(uhci)) + uhci_writew(uhci, uhci_readw(uhci, USBSTS), USBSTS); + + /* Mark it configured and running with a 64-byte max packet. + * All interrupts are enabled, even though RESUME won't do anything. + */ + uhci_writew(uhci, USBCMD_RS | USBCMD_CF | USBCMD_MAXP, USBCMD); + uhci_writew(uhci, USBINTR_TIMEOUT | USBINTR_RESUME | + USBINTR_IOC | USBINTR_SP, USBINTR); + mb(); + uhci->rh_state = UHCI_RH_RUNNING; + set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags); +} + +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 = uhci_readw(uhci, USBCMD) & USBCMD_EGSM; + uhci->rh_state = UHCI_RH_RESUMING; + uhci_writew(uhci, USBCMD_FGR | USBCMD_CF | egsm, 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 */ + uhci_writew(uhci, USBCMD_CF, USBCMD); + mb(); + udelay(4); + if (uhci_readw(uhci, 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 = uhci_readw(uhci, USBSTS); + if (!(status & ~USBSTS_HCH)) /* shared interrupt, not mine */ + return IRQ_NONE; + uhci_writew(uhci, status, USBSTS); /* Clear it */ + + spin_lock(&uhci->lock); + if (unlikely(!uhci->is_initialized)) /* not yet configured */ + goto done; + + 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) { + 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 - EXTRA_SPACE); + lprintk(errbuf); + } + uhci_hc_died(uhci); + usb_hc_died(hcd); + + /* Force a callback in case there are + * pending unlinks */ + mod_timer(&hcd->rh_timer, jiffies); + } + } + } + + if (status & USBSTS_RD) { + spin_unlock(&uhci->lock); + usb_hcd_poll_rh_status(hcd); + } else { + uhci_scan_schedule(uhci); + done: + spin_unlock(&uhci->lock); + } + + return IRQ_HANDLED; +} + +/* + * Store the current frame number in uhci->frame_number if the controller + * is running. 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 = (uhci_readw(uhci, 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; + + + 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); +} + +/* + * 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 __maybe_unused *dentry; + + hcd->uses_new_polling = 1; + /* Accept arbitrarily long scatter-gather lists */ + if (!(hcd->driver->flags & HCD_LOCAL_MEM)) + hcd->self.sg_tablesize = ~0; + + spin_lock_init(&uhci->lock); + timer_setup(&uhci->fsbr_timer, uhci_fsbr_timeout, 0); + INIT_LIST_HEAD(&uhci->idle_qh_list); + init_waitqueue_head(&uhci->waitqh); + +#ifdef UHCI_DEBUG_OPS + uhci->dentry = debugfs_create_file(hcd->self.bus_name, + S_IFREG|S_IRUGO|S_IWUSR, + uhci_debugfs_root, uhci, + &uhci_debug_operations); +#endif + + uhci->frame = dma_zalloc_coherent(uhci_dev(uhci), + UHCI_NUMFRAMES * sizeof(*uhci->frame), + &uhci->frame_dma_handle, GFP_KERNEL); + if (!uhci->frame) { + dev_err(uhci_dev(uhci), + "unable to allocate consistent memory for frame list\n"); + goto err_alloc_frame; + } + + uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu), + GFP_KERNEL); + if (!uhci->frame_cpu) + 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, uhci->skel_async_qh); + uhci->skel_async_qh->link = UHCI_PTR_TERM(uhci); + uhci->skel_term_qh->link = LINK_TO_QH(uhci, uhci->skel_term_qh); + + /* This dummy TD is to work around a bug in Intel PIIX controllers */ + uhci_fill_td(uhci, uhci->term_td, 0, uhci_explen(0) | + (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0); + uhci->term_td->link = UHCI_PTR_TERM(uhci); + uhci->skel_async_qh->element = uhci->skel_term_qh->element = + LINK_TO_TD(uhci, 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(); + + spin_lock_irq(&uhci->lock); + configure_hc(uhci); + uhci->is_initialized = 1; + start_rh(uhci); + spin_unlock_irq(&uhci->lock); + 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); + + return retval; +} + +static void uhci_stop(struct usb_hcd *hcd) +{ + struct uhci_hcd *uhci = hcd_to_uhci(hcd); + + spin_lock_irq(&uhci->lock); + if (HCD_HW_ACCESSIBLE(hcd) && !uhci->dead) + uhci_hc_died(uhci); + uhci_scan_schedule(uhci); + spin_unlock_irq(&uhci->lock); + synchronize_irq(hcd->irq); + + 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 (!HCD_HW_ACCESSIBLE(hcd)) + rc = -ESHUTDOWN; + else if (uhci->dead) + ; /* Dead controllers tell no tales */ + + /* Once the controller is stopped, port resumes that are already + * in progress won't complete. Hence if remote wakeup is enabled + * for the root hub and any ports are in the middle of a resume or + * remote wakeup, we must fail the suspend. + */ + else if (hcd->self.root_hub->do_remote_wakeup && + uhci->resuming_ports) { + dev_dbg(uhci_dev(uhci), + "suspend failed because a port is resuming\n"); + rc = -EBUSY; + } else + 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 (!HCD_HW_ACCESSIBLE(hcd)) + rc = -ESHUTDOWN; + else if (!uhci->dead) + wakeup_rh(uhci); + spin_unlock_irq(&uhci->lock); + return rc; +} + +#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 = (uhci_readw(uhci, USBFRNUM) - frame_number) & + (UHCI_NUMFRAMES - 1); + return frame_number + delta; +} + +/* Determines number of ports on controller */ +static int uhci_count_ports(struct usb_hcd *hcd) +{ + struct uhci_hcd *uhci = hcd_to_uhci(hcd); + unsigned io_size = (unsigned) hcd->rsrc_len; + int port; + + /* 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 = uhci_readw(uhci, 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; + } + + return port; +} + +static const char hcd_name[] = "uhci_hcd"; + +#ifdef CONFIG_USB_PCI +#include "uhci-pci.c" +#define PCI_DRIVER uhci_pci_driver +#endif + +#ifdef CONFIG_SPARC_LEON +#include "uhci-grlib.c" +#define PLATFORM_DRIVER uhci_grlib_driver +#endif + +#ifdef CONFIG_USB_UHCI_PLATFORM +#include "uhci-platform.c" +#define PLATFORM_DRIVER uhci_platform_driver +#endif + +#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) +#error "missing bus glue for uhci-hcd" +#endif + +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); + +#ifdef CONFIG_DYNAMIC_DEBUG + errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL); + if (!errbuf) + goto errbuf_failed; + uhci_debugfs_root = debugfs_create_dir("uhci", usb_debug_root); +#endif + + uhci_up_cachep = kmem_cache_create("uhci_urb_priv", + sizeof(struct urb_priv), 0, 0, NULL); + if (!uhci_up_cachep) + goto up_failed; + +#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 + + return 0; + +#ifdef PCI_DRIVER +clean1: +#endif +#ifdef PLATFORM_DRIVER + platform_driver_unregister(&PLATFORM_DRIVER); +clean0: +#endif + kmem_cache_destroy(uhci_up_cachep); + +up_failed: +#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) + debugfs_remove(uhci_debugfs_root); + + kfree(errbuf); + +errbuf_failed: +#endif + + clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded); + return retval; +} + +static void __exit uhci_hcd_cleanup(void) +{ +#ifdef PLATFORM_DRIVER + platform_driver_unregister(&PLATFORM_DRIVER); +#endif +#ifdef PCI_DRIVER + pci_unregister_driver(&PCI_DRIVER); +#endif + kmem_cache_destroy(uhci_up_cachep); + debugfs_remove(uhci_debugfs_root); +#ifdef CONFIG_DYNAMIC_DEBUG + kfree(errbuf); +#endif + 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"); |