// 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. *
*/
/* * 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
/* * 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]);
}
/* * Finish up a host controller reset and update the recorded state.
*/ staticvoid 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));
/* * Last rites for a defunct/nonfunctional controller * or one we don't want to use any more.
*/ staticvoid 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.
*/ staticvoid check_and_reset_hc(struct uhci_hcd *uhci)
{ if (uhci->check_and_reset_hc(uhci))
finish_reset(uhci);
}
#ifdefined(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.
*/ staticvoid 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.
*/ staticint uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
{ unsignedint 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.
*/
/* * Store the basic register settings needed by the controller.
*/ staticvoid 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);
}
staticint 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;
/* 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;
/* 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");
/* * 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);
/* * 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);
}
/* 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");
}
/* * 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);
}
}
}
/* * 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.
*/ staticvoid uhci_get_current_frame_number(struct uhci_hcd *uhci)
{ if (!uhci->is_stopped) { unsigned delta;
/* * 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.
*/ staticint uhci_start(struct usb_hcd *hcd)
{ struct uhci_hcd *uhci = hcd_to_uhci(hcd); int retval = -EBUSY; int i;
hcd->uses_new_polling = 1; /* Accept arbitrarily long scatter-gather lists */ if (!hcd->localmem_pool)
hcd->self.sg_tablesize = ~0;
uhci->frame = dma_alloc_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); if (!HCD_HW_ACCESSIBLE(hcd))
rc = -ESHUTDOWN; elseif (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.
*/ elseif (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;
}
/* Determines number of ports on controller */ staticint 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++) { unsignedint portstatus;
/* 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;
}
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