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linux/drivers/usb/host/ehci-hcd.c

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/*
* 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/config.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#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/smp_lock.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 "../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!
*
* HISTORY:
*
* 2004-05-10 Root hub and PCI suspend/resume support; remote wakeup. (db)
* 2004-02-24 Replace pci_* with generic dma_* API calls (dsaxena@plexity.net)
* 2003-12-29 Rewritten high speed iso transfer support (by Michal Sojka,
* <sojkam@centrum.cz>, updates by DB).
*
* 2002-11-29 Correct handling for hw async_next register.
* 2002-08-06 Handling for bulk and interrupt transfers is mostly shared;
* only scheduling is different, no arbitrary limitations.
* 2002-07-25 Sanity check PCI reads, mostly for better cardbus support,
* clean up HC run state handshaking.
* 2002-05-24 Preliminary FS/LS interrupts, using scheduling shortcuts
* 2002-05-11 Clear TT errors for FS/LS ctrl/bulk. Fill in some other
* missing pieces: enabling 64bit dma, handoff from BIOS/SMM.
* 2002-05-07 Some error path cleanups to report better errors; wmb();
* use non-CVS version id; better iso bandwidth claim.
* 2002-04-19 Control/bulk/interrupt submit no longer uses giveback() on
* errors in submit path. Bugfixes to interrupt scheduling/processing.
* 2002-03-05 Initial high-speed ISO support; reduce ITD memory; shift
* more checking to generic hcd framework (db). Make it work with
* Philips EHCI; reduce PCI traffic; shorten IRQ path (Rory Bolt).
* 2002-01-14 Minor cleanup; version synch.
* 2002-01-08 Fix roothub handoff of FS/LS to companion controllers.
* 2002-01-04 Control/Bulk queuing behaves.
*
* 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
* 2001-June Works with usb-storage and NEC EHCI on 2.4
*/
#define DRIVER_VERSION "10 Dec 2004"
#define DRIVER_AUTHOR "David Brownell"
#define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
static const char hcd_name [] = "ehci_hcd";
#undef EHCI_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_JIFFIES (HZ/100) /* arbitrary; ~10 msec */
#define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */
#define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */
#define EHCI_SHRINK_JIFFIES (HZ/200) /* 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");
#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 (void __iomem *ptr, u32 mask, u32 done, int usec)
{
u32 result;
do {
result = readl (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 = readl (&ehci->regs->status);
if ((temp & STS_HALT) != 0)
return 0;
temp = readl (&ehci->regs->command);
temp &= ~CMD_RUN;
writel (temp, &ehci->regs->command);
return handshake (&ehci->regs->status, STS_HALT, STS_HALT, 16 * 125);
}
/* put TDI/ARC silicon into EHCI mode */
static void tdi_reset (struct ehci_hcd *ehci)
{
u32 __iomem *reg_ptr;
u32 tmp;
reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + 0x68);
tmp = readl (reg_ptr);
tmp |= 0x3;
writel (tmp, reg_ptr);
}
/* reset a non-running (STS_HALT == 1) controller */
static int ehci_reset (struct ehci_hcd *ehci)
{
int retval;
u32 command = readl (&ehci->regs->command);
command |= CMD_RESET;
dbg_cmd (ehci, "reset", command);
writel (command, &ehci->regs->command);
ehci_to_hcd(ehci)->state = HC_STATE_HALT;
ehci->next_statechange = jiffies;
retval = handshake (&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 = readl (&ehci->regs->command) << 10;
temp &= STS_ASS | STS_PSS;
if (handshake (&ehci->regs->status, STS_ASS | STS_PSS,
temp, 16 * 125) != 0) {
ehci_to_hcd(ehci)->state = HC_STATE_HALT;
return;
}
/* then disable anything that's still active */
temp = readl (&ehci->regs->command);
temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
writel (temp, &ehci->regs->command);
/* hardware can take 16 microframes to turn off ... */
if (handshake (&ehci->regs->status, STS_ASS | STS_PSS,
0, 16 * 125) != 0) {
ehci_to_hcd(ehci)->state = HC_STATE_HALT;
return;
}
}
/*-------------------------------------------------------------------------*/
static void ehci_work(struct ehci_hcd *ehci, struct pt_regs *regs);
#include "ehci-hub.c"
#include "ehci-mem.c"
#include "ehci-q.c"
#include "ehci-sched.c"
/*-------------------------------------------------------------------------*/
static void ehci_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 with a vt8235 */
if (ehci->reclaim) {
u32 status = readl (&ehci->regs->status);
if (status & STS_IAA) {
ehci_vdbg (ehci, "lost IAA\n");
COUNT (ehci->stats.lost_iaa);
writel (STS_IAA, &ehci->regs->status);
ehci->reclaim_ready = 1;
}
}
/* 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, NULL);
spin_unlock_irqrestore (&ehci->lock, flags);
}
#ifdef CONFIG_PCI
/* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/...
* off the controller (maybe it can boot from highspeed USB disks).
*/
static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
{
struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
/* always say Linux will own the hardware */
pci_write_config_byte(pdev, where + 3, 1);
/* maybe wait a while for BIOS to respond */
if (cap & (1 << 16)) {
int msec = 5000;
do {
msleep(10);
msec -= 10;
pci_read_config_dword(pdev, where, &cap);
} while ((cap & (1 << 16)) && msec);
if (cap & (1 << 16)) {
ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n",
where, cap);
// some BIOS versions seem buggy...
// return 1;
ehci_warn (ehci, "continuing after BIOS bug...\n");
/* disable all SMIs, and clear "BIOS owns" flag */
pci_write_config_dword(pdev, where + 4, 0);
pci_write_config_byte(pdev, where + 2, 0);
} else
ehci_dbg(ehci, "BIOS handoff succeeded\n");
}
return 0;
}
#endif
static int
ehci_reboot (struct notifier_block *self, unsigned long code, void *null)
{
struct ehci_hcd *ehci;
ehci = container_of (self, struct ehci_hcd, reboot_notifier);
/* make BIOS/etc use companion controller during reboot */
writel (0, &ehci->regs->configured_flag);
return 0;
}
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);
msleep(20);
}
/* called by khubd or root hub init threads */
static int ehci_hc_reset (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp;
unsigned count = 256/4;
spin_lock_init (&ehci->lock);
ehci->caps = hcd->regs;
ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase));
dbg_hcs_params (ehci, "reset");
dbg_hcc_params (ehci, "reset");
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl (&ehci->caps->hcs_params);
#ifdef CONFIG_PCI
if (hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
switch (pdev->vendor) {
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
ehci->is_tdi_rh_tt = 1;
tdi_reset (ehci);
}
break;
case PCI_VENDOR_ID_AMD:
/* AMD8111 EHCI doesn't work, according to AMD errata */
if (pdev->device == 0x7463) {
ehci_info (ehci, "ignoring AMD8111 (errata)\n");
return -EIO;
}
break;
}
/* optional debug port, normally in the first BAR */
temp = pci_find_capability (pdev, 0x0a);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if ((temp & (3 << 13)) == (1 << 13)) {
temp &= 0x1fff;
ehci->debug = hcd->regs + temp;
temp = readl (&ehci->debug->control);
ehci_info (ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(ehci->hcs_params),
(temp & DBGP_ENABLED)
? " IN USE"
: "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
} else
temp = 0;
/* EHCI 0.96 and later may have "extended capabilities" */
while (temp && count--) {
u32 cap;
pci_read_config_dword (to_pci_dev(hcd->self.controller),
temp, &cap);
ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp);
switch (cap & 0xff) {
case 1: /* BIOS/SMM/... handoff */
if (bios_handoff (ehci, temp, cap) != 0)
return -EOPNOTSUPP;
break;
case 0: /* illegal reserved capability */
ehci_warn (ehci, "illegal capability!\n");
cap = 0;
/* FALLTHROUGH */
default: /* unknown */
break;
}
temp = (cap >> 8) & 0xff;
}
if (!count) {
ehci_err (ehci, "bogus capabilities ... PCI problems!\n");
return -EIO;
}
if (ehci_is_TDI(ehci))
ehci_reset (ehci);
#endif
ehci_port_power (ehci, 0);
/* at least the Genesys GL880S needs fixup here */
temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
temp &= 0x0f;
if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
ehci_dbg (ehci, "bogus port configuration: "
"cc=%d x pcc=%d < ports=%d\n",
HCS_N_CC(ehci->hcs_params),
HCS_N_PCC(ehci->hcs_params),
HCS_N_PORTS(ehci->hcs_params));
#ifdef CONFIG_PCI
if (hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev;
pdev = to_pci_dev(hcd->self.controller);
switch (pdev->vendor) {
case 0x17a0: /* GENESYS */
/* GL880S: should be PORTS=2 */
temp |= (ehci->hcs_params & ~0xf);
ehci->hcs_params = temp;
break;
case PCI_VENDOR_ID_NVIDIA:
/* NF4: should be PCC=10 */
break;
}
}
#endif
}
/* force HC to halt state */
return ehci_halt (ehci);
}
static int ehci_start (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp;
int retval;
u32 hcc_params;
u8 sbrn = 0;
int first;
/* skip some things on restart paths */
first = (ehci->watchdog.data == 0);
if (first) {
init_timer (&ehci->watchdog);
ehci->watchdog.function = ehci_watchdog;
ehci->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;
if (first && (retval = ehci_mem_init (ehci, GFP_KERNEL)) < 0)
return retval;
/* controllers may cache some of the periodic schedule ... */
hcc_params = readl (&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->reclaim_ready = 0;
ehci->next_uframe = -1;
/* controller state: unknown --> reset */
/* EHCI spec section 4.1 */
if ((retval = ehci_reset (ehci)) != 0) {
ehci_mem_cleanup (ehci);
return retval;
}
writel (ehci->periodic_dma, &ehci->regs->frame_list);
#ifdef CONFIG_PCI
if (hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev;
u16 port_wake;
pdev = to_pci_dev(hcd->self.controller);
/* Serial Bus Release Number is at PCI 0x60 offset */
pci_read_config_byte(pdev, 0x60, &sbrn);
/* port wake capability, reported by boot firmware */
pci_read_config_word(pdev, 0x62, &port_wake);
hcd->can_wakeup = (port_wake & 1) != 0;
/* help hc dma work well with cachelines */
pci_set_mwi (pdev);
}
#endif
/*
* 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.
*/
if (first) {
ehci->async->qh_next.qh = NULL;
ehci->async->hw_next = QH_NEXT (ehci->async->qh_dma);
ehci->async->hw_info1 = cpu_to_le32 (QH_HEAD);
ehci->async->hw_token = cpu_to_le32 (QTD_STS_HALT);
ehci->async->hw_qtd_next = EHCI_LIST_END;
ehci->async->qh_state = QH_STATE_LINKED;
ehci->async->hw_alt_next = QTD_NEXT (ehci->async->dummy->qtd_dma);
}
writel ((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.
*/
if (HCC_64BIT_ADDR (hcc_params)) {
writel (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
}
/* 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_info (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 ();
}
}
// Philips, Intel, and maybe others need CMD_RUN before the
// root hub will detect new devices (why?); NEC doesn't
temp |= CMD_RUN;
writel (temp, &ehci->regs->command);
dbg_cmd (ehci, "init", temp);
/* set async sleep time = 10 us ... ? */
/*
* 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.)
*/
if (first) {
ehci->reboot_notifier.notifier_call = ehci_reboot;
register_reboot_notifier (&ehci->reboot_notifier);
}
hcd->state = HC_STATE_RUNNING;
writel (FLAG_CF, &ehci->regs->configured_flag);
readl (&ehci->regs->command); /* unblock posted write */
temp = HC_VERSION(readl (&ehci->caps->hc_capbase));
ehci_info (ehci,
"USB %x.%x %s, EHCI %x.%02x, driver %s\n",
((sbrn & 0xf0)>>4), (sbrn & 0x0f),
first ? "initialized" : "restarted",
temp >> 8, temp & 0xff, DRIVER_VERSION);
writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
if (first)
create_debug_files (ehci);
return 0;
}
/* always called by thread; normally rmmod */
static void ehci_stop (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
ehci_dbg (ehci, "stop\n");
/* Turn off port power on all root hub ports. */
ehci_port_power (ehci, 0);
/* no more interrupts ... */
del_timer_sync (&ehci->watchdog);
spin_lock_irq(&ehci->lock);
if (HC_IS_RUNNING (hcd->state))
ehci_quiesce (ehci);
ehci_reset (ehci);
writel (0, &ehci->regs->intr_enable);
spin_unlock_irq(&ehci->lock);
/* let companion controllers work when we aren't */
writel (0, &ehci->regs->configured_flag);
unregister_reboot_notifier (&ehci->reboot_notifier);
remove_debug_files (ehci);
/* root hub is shut down separately (first, when possible) */
spin_lock_irq (&ehci->lock);
if (ehci->async)
ehci_work (ehci, NULL);
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", readl (&ehci->regs->status));
}
static int ehci_get_frame (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
/* suspend/resume, section 4.3 */
/* These routines rely on the bus (pci, platform, etc)
* to handle powerdown and wakeup, and currently also on
* transceivers that don't need any software attention to set up
* the right sort of wakeup.
*/
static int ehci_suspend (struct usb_hcd *hcd, pm_message_t message)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
#ifdef CONFIG_USB_SUSPEND
(void) usb_suspend_device (hcd->self.root_hub, message);
#else
usb_lock_device (hcd->self.root_hub);
(void) ehci_hub_suspend (hcd);
usb_unlock_device (hcd->self.root_hub);
#endif
// save (PCI) FLADJ in case of Vaux power loss
// ... we'd only use it to handle clock skew
return 0;
}
static int ehci_resume (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
unsigned port;
struct usb_device *root = hcd->self.root_hub;
int retval = -EINVAL;
// maybe restore (PCI) FLADJ
if (time_before (jiffies, ehci->next_statechange))
msleep (100);
/* If any port is suspended, we know we can/must resume the HC. */
for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) {
u32 status;
port--;
status = readl (&ehci->regs->port_status [port]);
if (status & PORT_SUSPEND) {
down (&hcd->self.root_hub->serialize);
retval = ehci_hub_resume (hcd);
up (&hcd->self.root_hub->serialize);
break;
}
if (!root->children [port])
continue;
dbg_port (ehci, __FUNCTION__, port + 1, status);
usb_set_device_state (root->children[port],
USB_STATE_NOTATTACHED);
}
/* Else reset, to cope with power loss or flush-to-storage
* style "resume" having activated BIOS during reboot.
*/
if (port == 0) {
(void) ehci_halt (ehci);
(void) ehci_reset (ehci);
(void) ehci_hc_reset (hcd);
/* emptying the schedule aborts any urbs */
spin_lock_irq (&ehci->lock);
if (ehci->reclaim)
ehci->reclaim_ready = 1;
ehci_work (ehci, NULL);
spin_unlock_irq (&ehci->lock);
/* restart; khubd will disconnect devices */
retval = ehci_start (hcd);
/* here we "know" root ports should always stay powered;
* but some controllers may lose all power.
*/
ehci_port_power (ehci, 1);
}
return retval;
}
#endif
/*-------------------------------------------------------------------------*/
/*
* 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, struct pt_regs *regs)
{
timer_action_done (ehci, TIMER_IO_WATCHDOG);
if (ehci->reclaim_ready)
end_unlink_async (ehci, regs);
/* 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, regs);
if (ehci->next_uframe != -1)
scan_periodic (ehci, regs);
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);
}
/*-------------------------------------------------------------------------*/
static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 status;
int bh;
spin_lock (&ehci->lock);
status = readl (&ehci->regs->status);
/* e.g. cardbus physical eject */
if (status == ~(u32) 0) {
ehci_dbg (ehci, "device removed\n");
goto dead;
}
status &= INTR_MASK;
if (!status) { /* irq sharing? */
spin_unlock(&ehci->lock);
return IRQ_NONE;
}
/* clear (just) interrupts */
writel (status, &ehci->regs->status);
readl (&ehci->regs->command); /* unblock posted write */
bh = 0;
#ifdef EHCI_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) {
COUNT (ehci->stats.reclaim);
ehci->reclaim_ready = 1;
bh = 1;
}
/* remote wakeup [4.3.1] */
if ((status & STS_PCD) && hcd->remote_wakeup) {
unsigned i = HCS_N_PORTS (ehci->hcs_params);
/* resume root hub? */
status = readl (&ehci->regs->command);
if (!(status & CMD_RUN))
writel (status | CMD_RUN, &ehci->regs->command);
while (i--) {
status = readl (&ehci->regs->port_status [i]);
if (status & PORT_OWNER)
continue;
if (!(status & PORT_RESUME)
|| 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);
mod_timer (&hcd->rh_timer,
ehci->reset_done [i] + 1);
ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
}
}
/* PCI errors [4.15.2.4] */
if (unlikely ((status & STS_FATAL) != 0)) {
/* bogus "fatal" IRQs appear on some chips... why? */
status = readl (&ehci->regs->status);
dbg_cmd (ehci, "fatal", readl (&ehci->regs->command));
dbg_status (ehci, "fatal", status);
if (status & STS_HALT) {
ehci_err (ehci, "fatal error\n");
dead:
ehci_reset (ehci);
writel (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, regs);
spin_unlock (&ehci->lock);
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 usb_host_endpoint *ep,
struct urb *urb,
unsigned 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:
// case PIPE_BULK:
default:
if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
return -ENOMEM;
return submit_async (ehci, ep, urb, &qtd_list, mem_flags);
case PIPE_INTERRUPT:
if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags))
return -ENOMEM;
return intr_submit (ehci, ep, 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)
{
/* if we need to use IAA and it's busy, defer */
if (qh->qh_state == QH_STATE_LINKED
&& ehci->reclaim
&& HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) {
struct ehci_qh *last;
for (last = ehci->reclaim;
last->reclaim;
last = last->reclaim)
continue;
qh->qh_state = QH_STATE_UNLINK_WAIT;
last->reclaim = qh;
/* bypass IAA if the hc can't care */
} else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim)
end_unlink_async (ehci, NULL);
/* something else might have unlinked the qh by now */
if (qh->qh_state == QH_STATE_LINKED)
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)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
struct ehci_qh *qh;
unsigned long flags;
spin_lock_irqsave (&ehci->lock, flags);
switch (usb_pipetype (urb->pipe)) {
// case PIPE_CONTROL:
// case PIPE_BULK:
default:
qh = (struct ehci_qh *) urb->hcpriv;
if (!qh)
break;
unlink_async (ehci, qh);
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, NULL);
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)) {
int status;
status = qh_schedule (ehci, qh);
spin_unlock_irqrestore (&ehci->lock, flags);
if (status != 0) {
// shouldn't happen often, but ...
// FIXME kill those tds' urbs
err ("can't reschedule qh %p, err %d",
qh, status);
}
return status;
}
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 0;
}
/*-------------------------------------------------------------------------*/
// 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? */
idle_timeout:
spin_unlock_irqrestore (&ehci->lock, flags);
set_current_state (TASK_UNINTERRUPTIBLE);
schedule_timeout (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 const struct hc_driver ehci_driver = {
.description = hcd_name,
.product_desc = "EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_hc_reset,
.start = ehci_start,
#ifdef CONFIG_PM
.suspend = ehci_suspend,
.resume = ehci_resume,
#endif
.stop = ehci_stop,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.hub_suspend = ehci_hub_suspend,
.hub_resume = ehci_hub_resume,
};
/*-------------------------------------------------------------------------*/
/* EHCI 1.0 doesn't require PCI */
#ifdef CONFIG_PCI
/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids [] = { {
/* handle any USB 2.0 EHCI controller */
PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0),
.driver_data = (unsigned long) &ehci_driver,
},
{ /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE (pci, pci_ids);
/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver ehci_pci_driver = {
.name = (char *) hcd_name,
.id_table = pci_ids,
.probe = usb_hcd_pci_probe,
.remove = usb_hcd_pci_remove,
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
.resume = usb_hcd_pci_resume,
#endif
};
#endif /* PCI */
#define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
MODULE_DESCRIPTION (DRIVER_INFO);
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_LICENSE ("GPL");
static int __init init (void)
{
if (usb_disabled())
return -ENODEV;
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));
return pci_register_driver (&ehci_pci_driver);
}
module_init (init);
static void __exit cleanup (void)
{
pci_unregister_driver (&ehci_pci_driver);
}
module_exit (cleanup);
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