+++ /dev/null
-/*
- * Copyright (c) 2000-2004 by David Brownell
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <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/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/timer.h>
-#include <linux/list.h>
-#include <linux/interrupt.h>
-#include <linux/reboot.h>
-#include <linux/usb.h>
-#include <linux/moduleparam.h>
-#include <linux/dma-mapping.h>
-#include <linux/debugfs.h>
-
-#include "../core/hcd.h"
-
-#include <asm/byteorder.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/system.h>
-#include <asm/unaligned.h>
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * EHCI hc_driver implementation ... experimental, incomplete.
- * Based on the final 1.0 register interface specification.
- *
- * USB 2.0 shows up in upcoming www.pcmcia.org technology.
- * First was PCMCIA, like ISA; then CardBus, which is PCI.
- * Next comes "CardBay", using USB 2.0 signals.
- *
- * Contains additional contributions by Brad Hards, Rory Bolt, and others.
- * Special thanks to Intel and VIA for providing host controllers to
- * test this driver on, and Cypress (including In-System Design) for
- * providing early devices for those host controllers to talk to!
- */
-
-#define DRIVER_AUTHOR "David Brownell"
-#define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
-
-static const char hcd_name [] = "ehci_hcd";
-
-
-#undef VERBOSE_DEBUG
-#undef EHCI_URB_TRACE
-
-#ifdef DEBUG
-#define EHCI_STATS
-#endif
-
-/* magic numbers that can affect system performance */
-#define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
-#define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
-#define EHCI_TUNE_RL_TT 0
-#define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
-#define EHCI_TUNE_MULT_TT 1
-#define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */
-
-#define EHCI_IAA_MSECS 10 /* arbitrary */
-#define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
-#define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */
-#define EHCI_SHRINK_FRAMES 5 /* async qh unlink delay */
-
-/* Initial IRQ latency: faster than hw default */
-static int log2_irq_thresh = 0; // 0 to 6
-module_param (log2_irq_thresh, int, S_IRUGO);
-MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
-
-/* initial park setting: slower than hw default */
-static unsigned park = 0;
-module_param (park, uint, S_IRUGO);
-MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets");
-
-/* for flakey hardware, ignore overcurrent indicators */
-static int ignore_oc = 0;
-module_param (ignore_oc, bool, S_IRUGO);
-MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
-
-#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
-
-/*-------------------------------------------------------------------------*/
-
-#include "ehci.h"
-#include "ehci-dbg.c"
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * handshake - spin reading hc until handshake completes or fails
- * @ptr: address of hc register to be read
- * @mask: bits to look at in result of read
- * @done: value of those bits when handshake succeeds
- * @usec: timeout in microseconds
- *
- * Returns negative errno, or zero on success
- *
- * Success happens when the "mask" bits have the specified value (hardware
- * handshake done). There are two failure modes: "usec" have passed (major
- * hardware flakeout), or the register reads as all-ones (hardware removed).
- *
- * That last failure should_only happen in cases like physical cardbus eject
- * before driver shutdown. But it also seems to be caused by bugs in cardbus
- * bridge shutdown: shutting down the bridge before the devices using it.
- */
-static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
- u32 mask, u32 done, int usec)
-{
- u32 result;
-
- do {
- result = ehci_readl(ehci, ptr);
- if (result == ~(u32)0) /* card removed */
- return -ENODEV;
- result &= mask;
- if (result == done)
- return 0;
- udelay (1);
- usec--;
- } while (usec > 0);
- return -ETIMEDOUT;
-}
-
-/* force HC to halt state from unknown (EHCI spec section 2.3) */
-static int ehci_halt (struct ehci_hcd *ehci)
-{
- u32 temp = ehci_readl(ehci, &ehci->regs->status);
-
- /* disable any irqs left enabled by previous code */
- ehci_writel(ehci, 0, &ehci->regs->intr_enable);
-
- if ((temp & STS_HALT) != 0)
- return 0;
-
- temp = ehci_readl(ehci, &ehci->regs->command);
- temp &= ~CMD_RUN;
- ehci_writel(ehci, temp, &ehci->regs->command);
- return handshake (ehci, &ehci->regs->status,
- STS_HALT, STS_HALT, 16 * 125);
-}
-
-static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
- u32 mask, u32 done, int usec)
-{
- int error;
-
- error = handshake(ehci, ptr, mask, done, usec);
- if (error) {
- ehci_halt(ehci);
- ehci_to_hcd(ehci)->state = HC_STATE_HALT;
- ehci_err(ehci, "force halt; handhake %p %08x %08x -> %d\n",
- ptr, mask, done, error);
- }
-
- return error;
-}
-
-/* put TDI/ARC silicon into EHCI mode */
-static void tdi_reset (struct ehci_hcd *ehci)
-{
- u32 __iomem *reg_ptr;
- u32 tmp;
-
- reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
- tmp = ehci_readl(ehci, reg_ptr);
- tmp |= USBMODE_CM_HC;
- /* The default byte access to MMR space is LE after
- * controller reset. Set the required endian mode
- * for transfer buffers to match the host microprocessor
- */
- if (ehci_big_endian_mmio(ehci))
- tmp |= USBMODE_BE;
- ehci_writel(ehci, tmp, reg_ptr);
-}
-
-/* reset a non-running (STS_HALT == 1) controller */
-static int ehci_reset (struct ehci_hcd *ehci)
-{
- int retval;
- u32 command = ehci_readl(ehci, &ehci->regs->command);
-
- command |= CMD_RESET;
- dbg_cmd (ehci, "reset", command);
- ehci_writel(ehci, command, &ehci->regs->command);
- ehci_to_hcd(ehci)->state = HC_STATE_HALT;
- ehci->next_statechange = jiffies;
- retval = handshake (ehci, &ehci->regs->command,
- CMD_RESET, 0, 250 * 1000);
-
- if (retval)
- return retval;
-
- if (ehci_is_TDI(ehci))
- tdi_reset (ehci);
-
- return retval;
-}
-
-/* idle the controller (from running) */
-static void ehci_quiesce (struct ehci_hcd *ehci)
-{
- u32 temp;
-
-#ifdef DEBUG
- if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
- BUG ();
-#endif
-
- /* wait for any schedule enables/disables to take effect */
- temp = ehci_readl(ehci, &ehci->regs->command) << 10;
- temp &= STS_ASS | STS_PSS;
- if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
- STS_ASS | STS_PSS, temp, 16 * 125))
- return;
-
- /* then disable anything that's still active */
- temp = ehci_readl(ehci, &ehci->regs->command);
- temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
- ehci_writel(ehci, temp, &ehci->regs->command);
-
- /* hardware can take 16 microframes to turn off ... */
- handshake_on_error_set_halt(ehci, &ehci->regs->status,
- STS_ASS | STS_PSS, 0, 16 * 125);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void end_unlink_async(struct ehci_hcd *ehci);
-static void ehci_work(struct ehci_hcd *ehci);
-
-#include "ehci-hub.c"
-#include "ehci-mem.c"
-#include "ehci-q.c"
-#include "ehci-sched.c"
-
-/*-------------------------------------------------------------------------*/
-
-static void ehci_iaa_watchdog(unsigned long param)
-{
- struct ehci_hcd *ehci = (struct ehci_hcd *) param;
- unsigned long flags;
-
- spin_lock_irqsave (&ehci->lock, flags);
-
- /* Lost IAA irqs wedge things badly; seen first with a vt8235.
- * So we need this watchdog, but must protect it against both
- * (a) SMP races against real IAA firing and retriggering, and
- * (b) clean HC shutdown, when IAA watchdog was pending.
- */
- if (ehci->reclaim
- && !timer_pending(&ehci->iaa_watchdog)
- && HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
- u32 cmd, status;
-
- /* If we get here, IAA is *REALLY* late. It's barely
- * conceivable that the system is so busy that CMD_IAAD
- * is still legitimately set, so let's be sure it's
- * clear before we read STS_IAA. (The HC should clear
- * CMD_IAAD when it sets STS_IAA.)
- */
- cmd = ehci_readl(ehci, &ehci->regs->command);
- if (cmd & CMD_IAAD)
- ehci_writel(ehci, cmd & ~CMD_IAAD,
- &ehci->regs->command);
-
- /* If IAA is set here it either legitimately triggered
- * before we cleared IAAD above (but _way_ late, so we'll
- * still count it as lost) ... or a silicon erratum:
- * - VIA seems to set IAA without triggering the IRQ;
- * - IAAD potentially cleared without setting IAA.
- */
- status = ehci_readl(ehci, &ehci->regs->status);
- if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
- COUNT (ehci->stats.lost_iaa);
- ehci_writel(ehci, STS_IAA, &ehci->regs->status);
- }
-
- ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
- status, cmd);
- end_unlink_async(ehci);
- }
-
- spin_unlock_irqrestore(&ehci->lock, flags);
-}
-
-static void ehci_watchdog(unsigned long param)
-{
- struct ehci_hcd *ehci = (struct ehci_hcd *) param;
- unsigned long flags;
-
- spin_lock_irqsave(&ehci->lock, flags);
-
- /* stop async processing after it's idled a bit */
- if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
- start_unlink_async (ehci, ehci->async);
-
- /* ehci could run by timer, without IRQs ... */
- ehci_work (ehci);
-
- spin_unlock_irqrestore (&ehci->lock, flags);
-}
-
-/* On some systems, leaving remote wakeup enabled prevents system shutdown.
- * The firmware seems to think that powering off is a wakeup event!
- * This routine turns off remote wakeup and everything else, on all ports.
- */
-static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
-{
- int port = HCS_N_PORTS(ehci->hcs_params);
-
- while (port--)
- ehci_writel(ehci, PORT_RWC_BITS,
- &ehci->regs->port_status[port]);
-}
-
-/*
- * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
- * Should be called with ehci->lock held.
- */
-static void ehci_silence_controller(struct ehci_hcd *ehci)
-{
- ehci_halt(ehci);
- ehci_turn_off_all_ports(ehci);
-
- /* make BIOS/etc use companion controller during reboot */
- ehci_writel(ehci, 0, &ehci->regs->configured_flag);
-
- /* unblock posted writes */
- ehci_readl(ehci, &ehci->regs->configured_flag);
-}
-
-/* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
- * This forcibly disables dma and IRQs, helping kexec and other cases
- * where the next system software may expect clean state.
- */
-static void ehci_shutdown(struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-
- del_timer_sync(&ehci->watchdog);
- del_timer_sync(&ehci->iaa_watchdog);
-
- spin_lock_irq(&ehci->lock);
- ehci_silence_controller(ehci);
- spin_unlock_irq(&ehci->lock);
-}
-
-static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
-{
- unsigned port;
-
- if (!HCS_PPC (ehci->hcs_params))
- return;
-
- ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
- for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
- (void) ehci_hub_control(ehci_to_hcd(ehci),
- is_on ? SetPortFeature : ClearPortFeature,
- USB_PORT_FEAT_POWER,
- port--, NULL, 0);
- /* Flush those writes */
- ehci_readl(ehci, &ehci->regs->command);
- msleep(20);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * ehci_work is called from some interrupts, timers, and so on.
- * it calls driver completion functions, after dropping ehci->lock.
- */
-static void ehci_work (struct ehci_hcd *ehci)
-{
- timer_action_done (ehci, TIMER_IO_WATCHDOG);
-
- /* another CPU may drop ehci->lock during a schedule scan while
- * it reports urb completions. this flag guards against bogus
- * attempts at re-entrant schedule scanning.
- */
- if (ehci->scanning)
- return;
- ehci->scanning = 1;
- scan_async (ehci);
- if (ehci->next_uframe != -1)
- scan_periodic (ehci);
- ehci->scanning = 0;
-
- /* the IO watchdog guards against hardware or driver bugs that
- * misplace IRQs, and should let us run completely without IRQs.
- * such lossage has been observed on both VT6202 and VT8235.
- */
- if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) &&
- (ehci->async->qh_next.ptr != NULL ||
- ehci->periodic_sched != 0))
- timer_action (ehci, TIMER_IO_WATCHDOG);
-}
-
-/*
- * Called when the ehci_hcd module is removed.
- */
-static void ehci_stop (struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
-
- ehci_dbg (ehci, "stop\n");
-
- /* no more interrupts ... */
- del_timer_sync (&ehci->watchdog);
- del_timer_sync(&ehci->iaa_watchdog);
-
- spin_lock_irq(&ehci->lock);
- if (HC_IS_RUNNING (hcd->state))
- ehci_quiesce (ehci);
-
- ehci_silence_controller(ehci);
- ehci_reset (ehci);
- spin_unlock_irq(&ehci->lock);
-
- remove_companion_file(ehci);
- remove_debug_files (ehci);
-
- /* root hub is shut down separately (first, when possible) */
- spin_lock_irq (&ehci->lock);
- if (ehci->async)
- ehci_work (ehci);
- spin_unlock_irq (&ehci->lock);
- ehci_mem_cleanup (ehci);
-
-#ifdef EHCI_STATS
- ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
- ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
- ehci->stats.lost_iaa);
- ehci_dbg (ehci, "complete %ld unlink %ld\n",
- ehci->stats.complete, ehci->stats.unlink);
-#endif
-
- dbg_status (ehci, "ehci_stop completed",
- ehci_readl(ehci, &ehci->regs->status));
-}
-
-/* one-time init, only for memory state */
-static int ehci_init(struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci(hcd);
- u32 temp;
- int retval;
- u32 hcc_params;
-
- spin_lock_init(&ehci->lock);
-
- init_timer(&ehci->watchdog);
- ehci->watchdog.function = ehci_watchdog;
- ehci->watchdog.data = (unsigned long) ehci;
-
- init_timer(&ehci->iaa_watchdog);
- ehci->iaa_watchdog.function = ehci_iaa_watchdog;
- ehci->iaa_watchdog.data = (unsigned long) ehci;
-
- /*
- * hw default: 1K periodic list heads, one per frame.
- * periodic_size can shrink by USBCMD update if hcc_params allows.
- */
- ehci->periodic_size = DEFAULT_I_TDPS;
- INIT_LIST_HEAD(&ehci->cached_itd_list);
- if ((retval = ehci_mem_init(ehci, GFP_KERNEL)) < 0)
- return retval;
-
- /* controllers may cache some of the periodic schedule ... */
- hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
- if (HCC_ISOC_CACHE(hcc_params)) // full frame cache
- ehci->i_thresh = 8;
- else // N microframes cached
- ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
-
- ehci->reclaim = NULL;
- ehci->next_uframe = -1;
- ehci->clock_frame = -1;
-
- /*
- * dedicate a qh for the async ring head, since we couldn't unlink
- * a 'real' qh without stopping the async schedule [4.8]. use it
- * as the 'reclamation list head' too.
- * its dummy is used in hw_alt_next of many tds, to prevent the qh
- * from automatically advancing to the next td after short reads.
- */
- ehci->async->qh_next.qh = NULL;
- ehci->async->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
- ehci->async->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
- ehci->async->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
- ehci->async->hw_qtd_next = EHCI_LIST_END(ehci);
- ehci->async->qh_state = QH_STATE_LINKED;
- ehci->async->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_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);
- 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();
- }
- }
- ehci->command = temp;
-
- 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);
- int retval;
- u32 temp;
- u32 hcc_params;
-
- hcd->uses_new_polling = 1;
- hcd->poll_rh = 0;
-
- /* EHCI spec section 4.1 */
- if ((retval = ehci_reset(ehci)) != 0) {
- ehci_mem_cleanup(ehci);
- return retval;
- }
- ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
- ehci_writel(ehci, (u32)ehci->async->qh_dma, &ehci->regs->async_next);
-
- /*
- * hcc_params controls whether ehci->regs->segment must (!!!)
- * be used; it constrains QH/ITD/SITD and QTD locations.
- * pci_pool consistent memory always uses segment zero.
- * streaming mappings for I/O buffers, like pci_map_single(),
- * can return segments above 4GB, if the device allows.
- *
- * NOTE: the dma mask is visible through dma_supported(), so
- * drivers can pass this info along ... like NETIF_F_HIGHDMA,
- * Scsi_Host.highmem_io, and so forth. It's readonly to all
- * host side drivers though.
- */
- hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
- if (HCC_64BIT_ADDR(hcc_params)) {
- ehci_writel(ehci, 0, &ehci->regs->segment);
-#if 0
-// this is deeply broken on almost all architectures
- if (!dma_set_mask(hcd->self.controller, DMA_64BIT_MASK))
- 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);
- hcd->state = HC_STATE_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);
-
- temp = HC_VERSION(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_companion_file(ehci);
-
- return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static irqreturn_t ehci_irq (struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- u32 status, masked_status, pcd_status = 0, cmd;
- int bh;
-
- spin_lock (&ehci->lock);
-
- status = ehci_readl(ehci, &ehci->regs->status);
-
- /* e.g. cardbus physical eject */
- if (status == ~(u32) 0) {
- ehci_dbg (ehci, "device removed\n");
- goto dead;
- }
-
- masked_status = status & INTR_MASK;
- if (!masked_status) { /* irq sharing? */
- spin_unlock(&ehci->lock);
- return IRQ_NONE;
- }
-
- /* clear (just) interrupts */
- ehci_writel(ehci, masked_status, &ehci->regs->status);
- cmd = ehci_readl(ehci, &ehci->regs->command);
- bh = 0;
-
-#ifdef VERBOSE_DEBUG
- /* unrequested/ignored: Frame List Rollover */
- dbg_status (ehci, "irq", status);
-#endif
-
- /* INT, ERR, and IAA interrupt rates can be throttled */
-
- /* normal [4.15.1.2] or error [4.15.1.1] completion */
- if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
- if (likely ((status & STS_ERR) == 0))
- COUNT (ehci->stats.normal);
- else
- COUNT (ehci->stats.error);
- bh = 1;
- }
-
- /* complete the unlinking of some qh [4.15.2.3] */
- if (status & STS_IAA) {
- /* guard against (alleged) silicon errata */
- if (cmd & CMD_IAAD) {
- ehci_writel(ehci, cmd & ~CMD_IAAD,
- &ehci->regs->command);
- ehci_dbg(ehci, "IAA with IAAD still set?\n");
- }
- if (ehci->reclaim) {
- COUNT(ehci->stats.reclaim);
- end_unlink_async(ehci);
- } else
- ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
- }
-
- /* remote wakeup [4.3.1] */
- if (status & STS_PCD) {
- unsigned i = HCS_N_PORTS (ehci->hcs_params);
-
- /* kick root hub later */
- pcd_status = status;
-
- /* resume root hub? */
- if (!(cmd & CMD_RUN))
- usb_hcd_resume_root_hub(hcd);
-
- while (i--) {
- int pstatus = ehci_readl(ehci,
- &ehci->regs->port_status [i]);
-
- if (pstatus & PORT_OWNER)
- continue;
- if (!(test_bit(i, &ehci->suspended_ports) &&
- ((pstatus & PORT_RESUME) ||
- !(pstatus & PORT_SUSPEND)) &&
- (pstatus & PORT_PE) &&
- ehci->reset_done[i] == 0))
- continue;
-
- /* start 20 msec resume signaling from this port,
- * and make khubd collect PORT_STAT_C_SUSPEND to
- * stop that signaling.
- */
- ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
- ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
- mod_timer(&hcd->rh_timer, ehci->reset_done[i]);
- }
- }
-
- /* PCI errors [4.15.2.4] */
- if (unlikely ((status & STS_FATAL) != 0)) {
- ehci_err(ehci, "fatal error\n");
- dbg_cmd(ehci, "fatal", cmd);
- dbg_status(ehci, "fatal", status);
- ehci_halt(ehci);
-dead:
- ehci_reset(ehci);
- ehci_writel(ehci, 0, &ehci->regs->configured_flag);
- /* generic layer kills/unlinks all urbs, then
- * uses ehci_stop to clean up the rest
- */
- bh = 1;
- }
-
- if (bh)
- ehci_work (ehci);
- spin_unlock (&ehci->lock);
- if (pcd_status)
- usb_hcd_poll_rh_status(hcd);
- return IRQ_HANDLED;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * non-error returns are a promise to giveback() the urb later
- * we drop ownership so next owner (or urb unlink) can get it
- *
- * urb + dev is in hcd.self.controller.urb_list
- * we're queueing TDs onto software and hardware lists
- *
- * hcd-specific init for hcpriv hasn't been done yet
- *
- * NOTE: control, bulk, and interrupt share the same code to append TDs
- * to a (possibly active) QH, and the same QH scanning code.
- */
-static int ehci_urb_enqueue (
- struct usb_hcd *hcd,
- struct urb *urb,
- gfp_t mem_flags
-) {
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- struct list_head qtd_list;
-
- INIT_LIST_HEAD (&qtd_list);
-
- switch (usb_pipetype (urb->pipe)) {
- case PIPE_CONTROL:
- /* qh_completions() code doesn't handle all the fault cases
- * in multi-TD control transfers. Even 1KB is rare anyway.
- */
- if (urb->transfer_buffer_length > (16 * 1024))
- return -EMSGSIZE;
- /* FALLTHROUGH */
- /* case PIPE_BULK: */
- default:
- if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
- return -ENOMEM;
- return submit_async(ehci, urb, &qtd_list, mem_flags);
-
- case PIPE_INTERRUPT:
- if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
- return -ENOMEM;
- return intr_submit(ehci, urb, &qtd_list, mem_flags);
-
- case PIPE_ISOCHRONOUS:
- if (urb->dev->speed == USB_SPEED_HIGH)
- return itd_submit (ehci, urb, mem_flags);
- else
- return sitd_submit (ehci, urb, mem_flags);
- }
-}
-
-static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
-{
- /* failfast */
- if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim)
- end_unlink_async(ehci);
-
- /* if it's not linked then there's nothing to do */
- if (qh->qh_state != QH_STATE_LINKED)
- ;
-
- /* defer till later if busy */
- else if (ehci->reclaim) {
- struct ehci_qh *last;
-
- for (last = ehci->reclaim;
- last->reclaim;
- last = last->reclaim)
- continue;
- qh->qh_state = QH_STATE_UNLINK_WAIT;
- last->reclaim = qh;
-
- /* start IAA cycle */
- } else
- start_unlink_async (ehci, qh);
-}
-
-/* remove from hardware lists
- * completions normally happen asynchronously
- */
-
-static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
-{
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- struct ehci_qh *qh;
- unsigned long flags;
- int rc;
-
- spin_lock_irqsave (&ehci->lock, flags);
- rc = usb_hcd_check_unlink_urb(hcd, urb, status);
- if (rc)
- goto done;
-
- switch (usb_pipetype (urb->pipe)) {
- // case PIPE_CONTROL:
- // case PIPE_BULK:
- default:
- qh = (struct ehci_qh *) urb->hcpriv;
- if (!qh)
- break;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- case QH_STATE_COMPLETING:
- unlink_async(ehci, qh);
- break;
- case QH_STATE_UNLINK:
- case QH_STATE_UNLINK_WAIT:
- /* already started */
- break;
- case QH_STATE_IDLE:
- WARN_ON(1);
- break;
- }
- break;
-
- case PIPE_INTERRUPT:
- qh = (struct ehci_qh *) urb->hcpriv;
- if (!qh)
- break;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- intr_deschedule (ehci, qh);
- /* FALL THROUGH */
- case QH_STATE_IDLE:
- qh_completions (ehci, qh);
- break;
- default:
- ehci_dbg (ehci, "bogus qh %p state %d\n",
- qh, qh->qh_state);
- goto done;
- }
-
- /* reschedule QH iff another request is queued */
- if (!list_empty (&qh->qtd_list)
- && HC_IS_RUNNING (hcd->state)) {
- rc = qh_schedule(ehci, qh);
-
- /* An error here likely indicates handshake failure
- * or no space left in the schedule. Neither fault
- * should happen often ...
- *
- * FIXME kill the now-dysfunctional queued urbs
- */
- if (rc != 0)
- ehci_err(ehci,
- "can't reschedule qh %p, err %d",
- qh, rc);
- }
- break;
-
- case PIPE_ISOCHRONOUS:
- // itd or sitd ...
-
- // wait till next completion, do it then.
- // completion irqs can wait up to 1024 msec,
- break;
- }
-done:
- spin_unlock_irqrestore (&ehci->lock, flags);
- return rc;
-}
-
-/*-------------------------------------------------------------------------*/
-
-// bulk qh holds the data toggle
-
-static void
-ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep)
-{
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- unsigned long flags;
- struct ehci_qh *qh, *tmp;
-
- /* ASSERT: any requests/urbs are being unlinked */
- /* ASSERT: nobody can be submitting urbs for this any more */
-
-rescan:
- spin_lock_irqsave (&ehci->lock, flags);
- qh = ep->hcpriv;
- if (!qh)
- goto done;
-
- /* endpoints can be iso streams. for now, we don't
- * accelerate iso completions ... so spin a while.
- */
- if (qh->hw_info1 == 0) {
- ehci_vdbg (ehci, "iso delay\n");
- goto idle_timeout;
- }
-
- if (!HC_IS_RUNNING (hcd->state))
- qh->qh_state = QH_STATE_IDLE;
- switch (qh->qh_state) {
- case QH_STATE_LINKED:
- for (tmp = ehci->async->qh_next.qh;
- tmp && tmp != qh;
- tmp = tmp->qh_next.qh)
- continue;
- /* periodic qh self-unlinks on empty */
- if (!tmp)
- goto nogood;
- unlink_async (ehci, qh);
- /* FALL THROUGH */
- case QH_STATE_UNLINK: /* wait for hw to finish? */
- case QH_STATE_UNLINK_WAIT:
-idle_timeout:
- spin_unlock_irqrestore (&ehci->lock, flags);
- schedule_timeout_uninterruptible(1);
- goto rescan;
- case QH_STATE_IDLE: /* fully unlinked */
- if (list_empty (&qh->qtd_list)) {
- qh_put (qh);
- break;
- }
- /* else FALL THROUGH */
- default:
-nogood:
- /* caller was supposed to have unlinked any requests;
- * that's not our job. just leak this memory.
- */
- ehci_err (ehci, "qh %p (#%02x) state %d%s\n",
- qh, ep->desc.bEndpointAddress, qh->qh_state,
- list_empty (&qh->qtd_list) ? "" : "(has tds)");
- break;
- }
- ep->hcpriv = NULL;
-done:
- spin_unlock_irqrestore (&ehci->lock, flags);
- return;
-}
-
-static int ehci_get_frame (struct usb_hcd *hcd)
-{
- struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- return (ehci_readl(ehci, &ehci->regs->frame_index) >> 3) %
- ehci->periodic_size;
-}
-
-/*-------------------------------------------------------------------------*/
-
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR (DRIVER_AUTHOR);
-MODULE_LICENSE ("GPL");
-
-#ifdef CONFIG_PCI
-#include "ehci-pci.c"
-#define PCI_DRIVER ehci_pci_driver
-#endif
-
-#ifdef CONFIG_USB_EHCI_FSL
-#include "ehci-fsl.c"
-#define PLATFORM_DRIVER ehci_fsl_driver
-#endif
-
-#ifdef CONFIG_SOC_AU1200
-#include "ehci-au1xxx.c"
-#define PLATFORM_DRIVER ehci_hcd_au1xxx_driver
-#endif
-
-#ifdef CONFIG_ARCH_OMAP34XX
-#include "ehci-omap.c"
-#define PLATFORM_DRIVER ehci_hcd_omap_driver
-#endif
-
-#ifdef CONFIG_PPC_PS3
-#include "ehci-ps3.c"
-#define PS3_SYSTEM_BUS_DRIVER ps3_ehci_driver
-#endif
-
-#ifdef CONFIG_USB_EHCI_HCD_PPC_OF
-#include "ehci-ppc-of.c"
-#define OF_PLATFORM_DRIVER ehci_hcd_ppc_of_driver
-#endif
-
-#ifdef CONFIG_PLAT_ORION
-#include "ehci-orion.c"
-#define PLATFORM_DRIVER ehci_orion_driver
-#endif
-
-#ifdef CONFIG_ARCH_IXP4XX
-#include "ehci-ixp4xx.c"
-#define PLATFORM_DRIVER ixp4xx_ehci_driver
-#endif
-
-#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
- !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER)
-#error "missing bus glue for ehci-hcd"
-#endif
-
-static int __init ehci_hcd_init(void)
-{
- int retval = 0;
-
- if (usb_disabled())
- return -ENODEV;
-
- printk(KERN_INFO "%s: " DRIVER_DESC "\n", hcd_name);
- set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
- if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
- test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
- printk(KERN_WARNING "Warning! ehci_hcd should always be loaded"
- " before uhci_hcd and ohci_hcd, not after\n");
-
- pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n",
- hcd_name,
- sizeof(struct ehci_qh), sizeof(struct ehci_qtd),
- sizeof(struct ehci_itd), sizeof(struct ehci_sitd));
-
-#ifdef DEBUG
- ehci_debug_root = debugfs_create_dir("ehci", NULL);
- if (!ehci_debug_root) {
- retval = -ENOENT;
- goto err_debug;
- }
-#endif
-
-#ifdef PLATFORM_DRIVER
- retval = platform_driver_register(&PLATFORM_DRIVER);
- if (retval < 0)
- goto clean0;
-#endif
-
-#ifdef PCI_DRIVER
- retval = pci_register_driver(&PCI_DRIVER);
- if (retval < 0)
- goto clean1;
-#endif
-
-#ifdef PS3_SYSTEM_BUS_DRIVER
- retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
- if (retval < 0)
- goto clean2;
-#endif
-
-#ifdef OF_PLATFORM_DRIVER
- retval = of_register_platform_driver(&OF_PLATFORM_DRIVER);
- if (retval < 0)
- goto clean3;
-#endif
- return retval;
-
-#ifdef OF_PLATFORM_DRIVER
- /* of_unregister_platform_driver(&OF_PLATFORM_DRIVER); */
-clean3:
-#endif
-#ifdef PS3_SYSTEM_BUS_DRIVER
- ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
-clean2:
-#endif
-#ifdef PCI_DRIVER
- pci_unregister_driver(&PCI_DRIVER);
-clean1:
-#endif
-#ifdef PLATFORM_DRIVER
- platform_driver_unregister(&PLATFORM_DRIVER);
-clean0:
-#endif
-#ifdef DEBUG
- debugfs_remove(ehci_debug_root);
- ehci_debug_root = NULL;
-err_debug:
-#endif
- clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
- return retval;
-}
-module_init(ehci_hcd_init);
-
-static void __exit ehci_hcd_cleanup(void)
-{
-#ifdef OF_PLATFORM_DRIVER
- of_unregister_platform_driver(&OF_PLATFORM_DRIVER);
-#endif
-#ifdef PLATFORM_DRIVER
- platform_driver_unregister(&PLATFORM_DRIVER);
-#endif
-#ifdef PCI_DRIVER
- pci_unregister_driver(&PCI_DRIVER);
-#endif
-#ifdef PS3_SYSTEM_BUS_DRIVER
- ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
-#endif
-#ifdef DEBUG
- debugfs_remove(ehci_debug_root);
-#endif
- clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
-}
-module_exit(ehci_hcd_cleanup);
-
projects / kernel-power / blobdiff