Skip to content

L
linux
Commit a96a4b53 authored by Georg Acher's avatar Georg Acher Committed by Greg Kroah-Hartman
Browse files
Options

[PATCH] USB-UHCI-HCD 

After maturing for more than a month, I decided that it's enough...
So here's the patch for the HCD-version of usb-uhci, I called it
usb-uhci-hcd. For me, the usual devices work (TM).

Since the internals haven't changed much, I don't expect much difference to
usb-uhci in functionality and performance.

There is one major improvement: I've added a (preliminary) watchdog, that
regularly checks whether UHCI interrupts are coming through. If they are
"missing", ie. the HC halted without saying so, the HC is "re-animated" by a
real and clean restart, which is (internally) equivalent to a module-reload.
This is especially for VIA-chips which get comatose quite easily by babble
or other incorrect transfers.

The side effect is, of course, disconnects for all connected devices, but
they re-appear after a few seconds and were dead before anyway. So keyboard
and mouse work again, which is IMO a _very_ useful thing :-)

Another point: The watchdog (currently with moderate 8 interrupts/s) detects
IRQ-problems, so the misleading "device doesn't accept new device"-message
is replaced by an immediate error.

More comments and the separation into multiple files (I've taken ohci-hcd as
an example) should make the code more concise...

A few things are still on the todo-list and will come later:
- A few watchdog modifications (fewer interrupts, better diagnostics)
- Support for module "tune"-parameters for breadth/depth search, debug etc.
- interval support for ISO
- More SMP-tests
- maybe changes for reference counting when it is clear what survives :-)
parent 82b3d954
Hide whitespace changes
Inline Side-by-side
Showing with 3298 additions and 0 deletions
drivers/usb/host/usb-uhci-dbg.c 0 → 100644
View file @ a96a4b53
/*
UHCI HCD (Host Controller Driver) for USB, debugging calls
(c) 1999-2002
Georg Acher + Deti Fliegl + Thomas Sailer
georg@acher.org deti@fliegl.de sailer@ife.ee.ethz.ch
$Id: usb-uhci-dbg.c,v 1.1 2002/05/14 20:36:57 acher Exp $
*/
#ifdef DEBUG
static void __attribute__((__unused__)) uhci_show_qh (puhci_desc_t qh)
{
if (qh->type != QH_TYPE) {
dbg("qh has not QH_TYPE");
return;
}
dbg("QH @ %p/%08llX:", qh, (unsigned long long)qh->dma_addr);
if (qh->hw.qh.head & UHCI_PTR_TERM)
dbg(" Head Terminate");
else
dbg(" Head: %s @ %08X",
(qh->hw.qh.head & UHCI_PTR_QH?"QH":"TD"),
qh->hw.qh.head & ~UHCI_PTR_BITS);
if (qh->hw.qh.element & UHCI_PTR_TERM)
dbg(" Element Terminate");
else
dbg(" Element: %s @ %08X",
(qh->hw.qh.element & UHCI_PTR_QH?"QH":"TD"),
qh->hw.qh.element & ~UHCI_PTR_BITS);
}
#endif
#if 0
static void uhci_show_td (puhci_desc_t td)
{
char *spid;
switch (td->hw.td.info & 0xff) {
case USB_PID_SETUP:
spid = "SETUP";
break;
case USB_PID_OUT:
spid = " OUT ";
break;
case USB_PID_IN:
spid = " IN ";
break;
default:
spid = " ? ";
break;
}
warn(" TD @ %p/%08X, MaxLen=%02x DT%d EP=%x Dev=%x PID=(%s) buf=%08x",
td, td->dma_addr,
td->hw.td.info >> 21,
((td->hw.td.info >> 19) & 1),
(td->hw.td.info >> 15) & 15,
(td->hw.td.info >> 8) & 127,
spid,
td->hw.td.buffer);
warn(" Len=%02x e%d %s%s%s%s%s%s%s%s%s%s",
td->hw.td.status & 0x7ff,
((td->hw.td.status >> 27) & 3),
(td->hw.td.status & TD_CTRL_SPD) ? "SPD " : "",
(td->hw.td.status & TD_CTRL_LS) ? "LS " : "",
(td->hw.td.status & TD_CTRL_IOC) ? "IOC " : "",
(td->hw.td.status & TD_CTRL_ACTIVE) ? "Active " : "",
(td->hw.td.status & TD_CTRL_STALLED) ? "Stalled " : "",
(td->hw.td.status & TD_CTRL_DBUFERR) ? "DataBufErr " : "",
(td->hw.td.status & TD_CTRL_BABBLE) ? "Babble " : "",
(td->hw.td.status & TD_CTRL_NAK) ? "NAK " : "",
(td->hw.td.status & TD_CTRL_CRCTIMEO) ? "CRC/Timeo " : "",
(td->hw.td.status & TD_CTRL_BITSTUFF) ? "BitStuff " : ""
);
if (td->hw.td.link & UHCI_PTR_TERM)
warn(" TD Link Terminate");
else
warn(" Link points to %s @ %08x, %s",
(td->hw.td.link & UHCI_PTR_QH?"QH":"TD"),
td->hw.td.link & ~UHCI_PTR_BITS,
(td->hw.td.link & UHCI_PTR_DEPTH ? "Depth first" : "Breadth first"));
}
#endif
#ifdef DEBUG
static void __attribute__((__unused__)) uhci_show_sc (int port, unsigned short status)
{
dbg(" stat%d = %04x %s%s%s%s%s%s%s%s",
port,
status,
(status & USBPORTSC_SUSP) ? "PortSuspend " : "",
(status & USBPORTSC_PR) ? "PortReset " : "",
(status & USBPORTSC_LSDA) ? "LowSpeed " : "",
(status & USBPORTSC_RD) ? "ResumeDetect " : "",
(status & USBPORTSC_PEC) ? "EnableChange " : "",
(status & USBPORTSC_PE) ? "PortEnabled " : "",
(status & USBPORTSC_CSC) ? "ConnectChange " : "",
(status & USBPORTSC_CCS) ? "PortConnected " : "");
}
void uhci_show_status (struct uhci_hcd *uhci)
{
unsigned int io_addr = (int)uhci->hcd.regs;
unsigned short usbcmd, usbstat, usbint, usbfrnum;
unsigned int flbaseadd;
unsigned char sof;
unsigned short portsc1, portsc2;
usbcmd = inw (io_addr + 0);
usbstat = inw (io_addr + 2);
usbint = inw (io_addr + 4);
usbfrnum = inw (io_addr + 6);
flbaseadd = inl (io_addr + 8);
sof = inb (io_addr + 12);
portsc1 = inw (io_addr + 16);
portsc2 = inw (io_addr + 18);
dbg(" usbcmd = %04x %s%s%s%s%s%s%s%s",
usbcmd,
(usbcmd & USBCMD_MAXP) ? "Maxp64 " : "Maxp32 ",
(usbcmd & USBCMD_CF) ? "CF " : "",
(usbcmd & USBCMD_SWDBG) ? "SWDBG " : "",
(usbcmd & USBCMD_FGR) ? "FGR " : "",
(usbcmd & USBCMD_EGSM) ? "EGSM " : "",
(usbcmd & USBCMD_GRESET) ? "GRESET " : "",
(usbcmd & USBCMD_HCRESET) ? "HCRESET " : "",
(usbcmd & USBCMD_RS) ? "RS " : "");
dbg(" usbstat = %04x %s%s%s%s%s%s",
usbstat,
(usbstat & USBSTS_HCH) ? "HCHalted " : "",
(usbstat & USBSTS_HCPE) ? "HostControllerProcessError " : "",
(usbstat & USBSTS_HSE) ? "HostSystemError " : "",
(usbstat & USBSTS_RD) ? "ResumeDetect " : "",
(usbstat & USBSTS_ERROR) ? "USBError " : "",
(usbstat & USBSTS_USBINT) ? "USBINT " : "");
dbg(" usbint = %04x", usbint);
dbg(" usbfrnum = (%d)%03x", (usbfrnum >> 10) & 1,
0xfff & (4 * (unsigned int) usbfrnum));
dbg(" flbaseadd = %08x", flbaseadd);
dbg(" sof = %02x", sof);
uhci_show_sc (1, portsc1);
uhci_show_sc (2, portsc2);
}
#endif
drivers/usb/host/usb-uhci-hcd.c 0 → 100644
View file @ a96a4b53
/*
UHCI HCD (Host Controller Driver) for USB, main part for HCD frame
(c) 1999-2002
Georg Acher + Deti Fliegl + Thomas Sailer
georg@acher.org deti@fliegl.de sailer@ife.ee.ethz.ch
with the help of
David Brownell, david-b@pacbell.net
Adam Richter, adam@yggdrasil.com
Roman Weissgaerber, weissg@vienna.at
HW-initalization based on material of
Randy Dunlap + Johannes Erdfelt + Gregory P. Smith + Linus Torvalds
$Id: usb-uhci-hcd.c,v 1.1 2002/05/14 20:36:57 acher Exp $
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/pci.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> /* for in_interrupt () */
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/usb.h>
#define CONFIG_USB_DEBUG
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include "../core/hcd.h"
#include "usb-uhci-hcd.h"
#define DRIVER_VERSION "$Revision: 1.1 $"
#define DRIVER_AUTHOR "Georg Acher, Deti Fliegl, Thomas Sailer"
#define DRIVER_DESC "USB 1.1 Universal Host Controller Interface driver (HCD)"
/*--------------------------------------------------------------------------*/
// Values you may tweak
/* CONFIG_USB_UHCI_HIGH_BANDWITH turns on Full Speed Bandwidth
* Reclamation: feature that puts loop on descriptor loop when
* there's some transfer going on. With FSBR, USB performance
* is optimal, but PCI can be slowed down up-to 5 times, slowing down
* system performance (eg. framebuffer devices).
*/
#define CONFIG_USB_UHCI_HIGH_BANDWIDTH
/* *_DEPTH_FIRST puts descriptor in depth-first mode. This has
* somehow similar effect to FSBR (higher speed), but does not
* slow PCI down. OTOH USB performace is slightly slower than
* in FSBR case and single device could hog whole USB, starving
* other devices.
*/
#define USE_CTRL_DEPTH_FIRST 0 // 0: Breadth first, 1: Depth first
#define USE_BULK_DEPTH_FIRST 0 // 0: Breadth first, 1: Depth first
/* Turning off both CONFIG_USB_UHCI_HIGH_BANDWITH and *_DEPTH_FIRST
* will lead to <64KB/sec performance over USB for bulk transfers targeting
* one device's endpoint. You probably do not want to do that.
*/
// stop bandwidth reclamation after (roughly) 50ms
#define IDLE_TIMEOUT (HZ/20)
// Suppress HC interrupt error messages for 5s
#define ERROR_SUPPRESSION_TIME (HZ*5)
// HC watchdog
#define WATCHDOG_TIMEOUT (4*HZ)
#define MAX_REANIMATIONS 5
#define DEBUG_SYMBOLS
#ifdef DEBUG_SYMBOLS
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
#endif
#define queue_dbg dbg
#define async_dbg dbg
#define init_dbg dbg
/*--------------------------------------------------------------------------*/
// NO serviceable parts below!
/*--------------------------------------------------------------------------*/
// How much URBs with ->next are walked
#define MAX_NEXT_COUNT 2048
static struct uhci *devs = NULL;
/* used by userspace UHCI data structure dumper */
struct uhci **uhci_devices = &devs;
/* A few prototypes */
static int uhci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb);
static int hc_reset (struct uhci_hcd *uhci);
static void uhci_stop (struct usb_hcd *hcd);
static int process_transfer (struct uhci_hcd *uhci, struct urb *urb, int mode);
static int process_iso (struct uhci_hcd *uhci, struct urb *urb, int mode);
static int process_interrupt (struct uhci_hcd *uhci, struct urb *urb, int mode);
static int process_urb (struct uhci_hcd *uhci, struct list_head *p);
static int uhci_urb_enqueue (struct usb_hcd *hcd, struct urb *urb, int mem_flags);
static int hc_defibrillate(struct uhci_hcd * uhci);
static int hc_irq_run(struct uhci_hcd *uhci);
#include "usb-uhci-dbg.c"
#include "usb-uhci-mem.c"
#include "usb-uhci-hub.c"
#include "usb-uhci-q.c"
#define PIPESTRING(x) (x==PIPE_BULK?"Bulk":(x==PIPE_INTERRUPT?"Interrupt":(x==PIPE_CONTROL?"Control":"Iso")))
/*--------------------------------------------------------------------------*/
static int uhci_urb_enqueue (struct usb_hcd *hcd, struct urb *urb, int mem_flags)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
urb_priv_t *urb_priv;
int ret = 0, type;
unsigned long flags;
struct urb *queued_urb=NULL;
int bustime;
type = usb_pipetype (urb->pipe);
// err("submit_urb: scheduling %p (%s), tb %p, len %i", urb,
// PIPESTRING(type),urb->transfer_buffer,urb->transfer_buffer_length);
if (uhci->need_init) {
if (in_interrupt())
return -ESHUTDOWN;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
ret = hc_defibrillate(uhci);
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
if (ret)
return ret;
}
if (!uhci->running)
return -ESHUTDOWN;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
queued_urb = search_dev_ep (uhci, urb); // returns already queued urb for that pipe
if (queued_urb) {
queue_dbg("found bulk urb %p\n", queued_urb);
if (( type != PIPE_BULK) ||
((type == PIPE_BULK) &&
(!(urb->transfer_flags & USB_QUEUE_BULK) || !(queued_urb->transfer_flags & USB_QUEUE_BULK)))) {
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
err("ENXIO (%s) %08x, flags %x, urb %p, burb %p, propably device driver bug...",
PIPESTRING(type),
urb->pipe,urb->transfer_flags,urb,queued_urb);
return -ENXIO; // urb already queued
}
}
urb_priv = uhci_alloc_priv(mem_flags);
if (!urb_priv) {
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
return -ENOMEM;
}
urb->hcpriv = urb_priv;
urb_priv->urb=urb;
INIT_LIST_HEAD (&urb_priv->desc_list);
if (type == PIPE_CONTROL)
urb_priv->setup_packet_dma = pci_map_single(uhci->uhci_pci, urb->setup_packet,
sizeof(struct usb_ctrlrequest), PCI_DMA_TODEVICE);
if (urb->transfer_buffer_length)
urb_priv->transfer_buffer_dma = pci_map_single(uhci->uhci_pci,
urb->transfer_buffer,
urb->transfer_buffer_length,
usb_pipein(urb->pipe) ?
PCI_DMA_FROMDEVICE :
PCI_DMA_TODEVICE);
// for bulk queuing it is essential that interrupts are disabled until submission
// all other type enable interrupts again
switch (type) {
case PIPE_BULK:
if (queued_urb) {
while (((urb_priv_t*)queued_urb->hcpriv)->next_queued_urb) // find last queued bulk
queued_urb=((urb_priv_t*)queued_urb->hcpriv)->next_queued_urb;
((urb_priv_t*)queued_urb->hcpriv)->next_queued_urb=urb;
}
atomic_inc (&uhci->avoid_bulk);
ret = uhci_submit_bulk_urb (uhci, urb, queued_urb);
atomic_dec (&uhci->avoid_bulk);
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
break;
case PIPE_ISOCHRONOUS:
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
if (urb->bandwidth == 0) { /* not yet checked/allocated */
bustime = usb_check_bandwidth (urb->dev, urb);
if (bustime < 0)
ret = bustime;
else {
ret = uhci_submit_iso_urb(uhci, urb, mem_flags);
if (ret == 0)
usb_claim_bandwidth (urb->dev, urb, bustime, 1);
}
} else { /* bandwidth is already set */
ret = uhci_submit_iso_urb(uhci, urb, mem_flags);
}
break;
case PIPE_INTERRUPT:
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
if (urb->bandwidth == 0) { /* not yet checked/allocated */
bustime = usb_check_bandwidth (urb->dev, urb);
if (bustime < 0)
ret = bustime;
else {
ret = uhci_submit_int_urb(uhci, urb);
if (ret == 0)
usb_claim_bandwidth (urb->dev, urb, bustime, 0);
}
} else { /* bandwidth is already set */
ret = uhci_submit_int_urb(uhci, urb);
}
break;
case PIPE_CONTROL:
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
ret = uhci_submit_control_urb (uhci, urb);
break;
default:
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
ret = -EINVAL;
}
// err("submit_urb: scheduled with ret: %d", ret);
if (ret != 0)
uhci_free_priv(uhci, urb, urb_priv);
return ret;
}
/*--------------------------------------------------------------------------*/
static int uhci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
{
unsigned long flags=0;
struct uhci_hcd *uhci;
dbg("uhci_urb_dequeue called for %p",urb);
uhci = hcd_to_uhci (hcd);
if (urb->transfer_flags & USB_ASYNC_UNLINK) {
int ret;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
ret = uhci_unlink_urb_async(uhci, urb, UNLINK_ASYNC_STORE_URB);
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
return ret;
}
else
return uhci_unlink_urb_sync(uhci, urb);
}
/*--------------------------------------------------------------------------*/
static int uhci_get_frame (struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
return inw ((int)uhci->hcd.regs + USBFRNUM);
}
/*--------------------------------------------------------------------------*/
// Init and shutdown functions for HW
/*--------------------------------------------------------------------------*/
static int hc_reset (struct uhci_hcd *uhci)
{
unsigned int io_addr = (int)uhci->hcd.regs;
uhci->apm_state = 0;
uhci->running = 0;
outw (USBCMD_GRESET, io_addr + USBCMD);
uhci_wait_ms (50); /* Global reset for 50ms */
outw (0, io_addr + USBCMD);
uhci_wait_ms (10);
return 0;
}
/*--------------------------------------------------------------------------*/
static int hc_irq_run(struct uhci_hcd *uhci)
{
unsigned int io_addr = (int)uhci->hcd.regs;
/* Turn on all interrupts */
outw (USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP, io_addr + USBINTR);
/* Start at frame 0 */
outw (0, io_addr + USBFRNUM);
outl (uhci->framelist_dma, io_addr + USBFLBASEADD);
/* Run and mark it configured with a 64-byte max packet */
outw (USBCMD_RS | USBCMD_CF | USBCMD_MAXP, io_addr + USBCMD);
uhci->apm_state = 1;
uhci->running = 1;
uhci->last_hcd_irq = jiffies+4*HZ;
return 0;
}
/*--------------------------------------------------------------------------*/
static int hc_start (struct uhci_hcd *uhci)
{
unsigned int io_addr = (int)uhci->hcd.regs;
int timeout = 10;
struct usb_device *udev;
init_dbg("hc_start uhci %p",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.
*/
outw (USBCMD_HCRESET, io_addr + USBCMD);
while (inw (io_addr + USBCMD) & USBCMD_HCRESET) {
if (!--timeout) {
err("USBCMD_HCRESET timed out!");
break;
}
udelay(1);
}
hc_irq_run(uhci);
/* connect the virtual root hub */
uhci->hcd.self.root_hub = udev = usb_alloc_dev (NULL, &uhci->hcd.self);
uhci->hcd.state = USB_STATE_READY;
if (!udev) {
uhci->running = 0;
// FIXME cleanup
return -ENOMEM;
}
usb_connect (udev);
udev->speed = USB_SPEED_FULL;
if (usb_register_root_hub (udev, &uhci->hcd.pdev->dev) != 0) {
usb_free_dev (udev);
uhci->running = 0;
// FIXME cleanup
return -ENODEV;
}
return 0;
}
/*--------------------------------------------------------------------------*/
// Start up UHCI, find ports, init DMA lists
static int __devinit uhci_start (struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
int ret;
int io_addr=(int)hcd->regs, io_size=0x20; // FIXME
init_dbg("uhci_start hcd %p uhci %p, pdev %p",hcd,uhci,hcd->pdev);
/* disable legacy emulation, Linux takes over... */
pci_write_config_word (hcd->pdev, USBLEGSUP, 0);
/* UHCI specs says devices must have 2 ports, but goes on to say */
/* they may have more but give no way to determine how many they */
/* have, so default to 2 */
/* According to the UHCI spec, Bit 7 is always set to 1. So we try */
/* to use this to our advantage */
for (uhci->maxports = 0; uhci->maxports < (io_size - 0x10) / 2; uhci->maxports++) {
unsigned int portstatus;
portstatus = inw (io_addr + 0x10 + (uhci->maxports * 2));
dbg("port %i, adr %x status %x", uhci->maxports,
io_addr + 0x10 + (uhci->maxports * 2), portstatus);
if (!(portstatus & 0x0080))
break;
}
warn("Detected %d ports", uhci->maxports);
if (uhci->maxports < 2 || uhci->maxports > 8) {
dbg("Port count misdetected, forcing to 2 ports");
uhci->maxports = 2;
}
ret=init_skel(uhci);
if (ret)
return ret;
hc_reset (uhci);
if (hc_start (uhci) < 0) {
err ("can't start %s", uhci->hcd.self.bus_name);
uhci_stop (hcd);
return -EBUSY;
}
// Enable PIRQ
pci_write_config_word (hcd->pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
set_td_ioc(uhci->td128ms); // start watchdog interrupt
uhci->last_hcd_irq=jiffies+5*HZ;
return 0;
}
/*--------------------------------------------------------------------------*/
static void uhci_free_config (struct usb_hcd *hcd, struct usb_device *udev)
{
dbg("uhci_free_config for dev %p", udev);
uhci_unlink_urbs (hcd_to_uhci (hcd), udev, 0); // Forced unlink of remaining URBs
}
/*--------------------------------------------------------------------------*/
static void uhci_stop (struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
init_dbg("%s: stop controller", hcd->bus_name);
uhci->running=0;
hc_reset (uhci);
wait_ms (1);
uhci_unlink_urbs (uhci, 0, CLEAN_FORCED); // Forced unlink of remaining URBs
uhci_cleanup_unlink (uhci, CLEAN_FORCED); // force cleanup of async killed URBs
cleanup_skel (uhci);
}
/*--------------------------------------------------------------------------*/
// UHCI INTERRUPT PROCESSING
/*--------------------------------------------------------------------------*/
static void uhci_irq (struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
unsigned int io_addr = (int)hcd->regs;
unsigned short status;
struct list_head *p, *p2;
int restarts, work_done;
/*
* Read the interrupt status, and write it back to clear the
* interrupt cause
*/
status = inw (io_addr + USBSTS);
if (!status) /* shared interrupt, not mine */
return;
dbg("interrupt");
uhci->last_hcd_irq=jiffies; // for watchdog
if (status != 1) {
// Avoid too much error messages at a time
if (time_after(jiffies, uhci->last_error_time + ERROR_SUPPRESSION_TIME)) {
warn("interrupt, status %x, frame# %i", status,
UHCI_GET_CURRENT_FRAME(uhci));
uhci->last_error_time = jiffies;
}
// remove host controller halted state
if ((status&0x20) && (uhci->running)) {
err("Host controller halted, waiting for timeout.");
// outw (USBCMD_RS | inw(io_addr + USBCMD), io_addr + USBCMD);
}
//uhci_show_status (s);
}
/*
* traverse the list in *reverse* direction, because new entries
* may be added at the end.
* also, because process_urb may unlink the current urb,
* we need to advance the list before
* New: check for max. workload and restart count
*/
spin_lock (&uhci->urb_list_lock);
restarts=0;
work_done=0;
restart:
uhci->unlink_urb_done=0;
p = uhci->urb_list.prev;
while (p != &uhci->urb_list && (work_done < 1024)) {
p2 = p;
p = p->prev;
process_urb (uhci, p2);
work_done++;
if (uhci->unlink_urb_done) {
uhci->unlink_urb_done=0;
restarts++;
if (restarts<16) // avoid endless restarts
goto restart;
else
break;
}
}
if (time_after(jiffies, uhci->timeout_check + (HZ/30)))
uhci_check_timeouts(uhci);
clean_descs(uhci, CLEAN_NOT_FORCED);
uhci_cleanup_unlink(uhci, CLEAN_NOT_FORCED);
uhci_switch_timer_int(uhci);
spin_unlock (&uhci->urb_list_lock);
outw (status, io_addr + USBSTS);
//dbg("uhci_interrupt: done");
}
/*--------------------------------------------------------------------------*/
// POWER MANAGEMENT
#ifdef CONFIG_PM
static int uhci_suspend (struct usb_hcd *hcd, u32 state)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
hc_reset(uhci);
return 0;
}
/*--------------------------------------------------------------------------*/
static int uhci_resume (struct usb_hcd *hcd)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
hc_start(uhci);
return 0;
}
#endif
/*--------------------------------------------------------------------------*/
static const char hcd_name [] = "usb-uhci-hcd";
static const struct hc_driver uhci_driver = {
description: hcd_name,
// generic hardware linkage
irq: uhci_irq,
flags: HCD_USB11,
// basic lifecycle operations
start: uhci_start,
#ifdef CONFIG_PM
suspend: uhci_suspend,
resume: uhci_resume,
#endif
stop: uhci_stop,
// memory lifecycle (except per-request)
hcd_alloc: uhci_hcd_alloc,
hcd_free: uhci_hcd_free,
// managing i/o requests and associated device resources
urb_enqueue: uhci_urb_enqueue,
urb_dequeue: uhci_urb_dequeue,
free_config: uhci_free_config,
// scheduling support
get_frame_number: uhci_get_frame,
// root hub support
hub_status_data: uhci_hub_status_data,
hub_control: uhci_hub_control,
};
#define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC
EXPORT_NO_SYMBOLS;
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_INFO);
MODULE_LICENSE ("GPL");
static const struct pci_device_id __devinitdata pci_ids [] = { {
/* handle any USB UHCI controller */
class: (PCI_CLASS_SERIAL_USB << 8) | 0x00,
class_mask: ~0,
driver_data: (unsigned long) &uhci_driver,
/* no matter who makes it */
vendor: PCI_ANY_ID,
device: PCI_ANY_ID,
subvendor: PCI_ANY_ID,
subdevice: PCI_ANY_ID,
}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE (pci, pci_ids);
/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver uhci_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
};
/*-------------------------------------------------------------------------*/
static int __init uhci_hcd_init (void)
{
init_dbg (DRIVER_INFO);
init_dbg ("block sizes: hq %d td %d",
sizeof (struct qh), sizeof (struct td));
return pci_module_init (&uhci_pci_driver);
}
static void __exit uhci_hcd_cleanup (void)
{
pci_unregister_driver (&uhci_pci_driver);
}
module_init (uhci_hcd_init);
module_exit (uhci_hcd_cleanup);
drivers/usb/host/usb-uhci-hcd.h 0 → 100644
View file @ a96a4b53
#ifndef __LINUX_USB_UHCI_H
#define __LINUX_USB_UHCI_H
/* $Id: usb-uhci-hcd.h,v 1.1 2002/05/14 20:36:57 acher Exp $ */
#ifndef CONFIG_PCI
#error "UHCI needs the CONFIG_PCI option!"
#endif
#define MODNAME "usb-uhci-hcd"
#define UHCI_LATENCY_TIMER 0
static __inline__ void uhci_wait_ms(unsigned int ms)
{
if(!in_interrupt())
{
current->state = TASK_UNINTERRUPTIBLE;
schedule_timeout(1 + ms * HZ / 1000);
}
else
mdelay(ms);
}
/* Command register */
#define USBCMD 0
#define USBCMD_RS 0x0001 /* Run/Stop */
#define USBCMD_HCRESET 0x0002 /* Host reset */
#define USBCMD_GRESET 0x0004 /* Global reset */
#define USBCMD_EGSM 0x0008 /* Global Suspend Mode */
#define USBCMD_FGR 0x0010 /* Force Global Resume */
#define USBCMD_SWDBG 0x0020 /* SW Debug mode */
#define USBCMD_CF 0x0040 /* Config Flag (sw only) */
#define USBCMD_MAXP 0x0080 /* Max Packet (0 = 32, 1 = 64) */
/* Status register */
#define USBSTS 2
#define USBSTS_USBINT 0x0001 /* Interrupt due to IOC */
#define USBSTS_ERROR 0x0002 /* Interrupt due to error */
#define USBSTS_RD 0x0004 /* Resume Detect */
#define USBSTS_HSE 0x0008 /* Host System Error - basically PCI problems */
#define USBSTS_HCPE 0x0010 /* Host Controller Process Error - the scripts were buggy */
#define USBSTS_HCH 0x0020 /* HC Halted */
/* Interrupt enable register */
#define USBINTR 4
#define USBINTR_TIMEOUT 0x0001 /* Timeout/CRC error enable */
#define USBINTR_RESUME 0x0002 /* Resume interrupt enable */
#define USBINTR_IOC 0x0004 /* Interrupt On Complete enable */
#define USBINTR_SP 0x0008 /* Short packet interrupt enable */
#define USBFRNUM 6
#define USBFLBASEADD 8
#define USBSOF 12
/* USB port status and control registers */
#define USBPORTSC1 16
#define USBPORTSC2 18
#define USBPORTSC_CCS 0x0001 /* Current Connect Status ("device present") */
#define USBPORTSC_CSC 0x0002 /* Connect Status Change */
#define USBPORTSC_PE 0x0004 /* Port Enable */
#define USBPORTSC_PEC 0x0008 /* Port Enable Change */
#define USBPORTSC_LS 0x0030 /* Line Status */
#define USBPORTSC_RD 0x0040 /* Resume Detect */
#define USBPORTSC_LSDA 0x0100 /* Low Speed Device Attached */
#define USBPORTSC_PR 0x0200 /* Port Reset */
#define USBPORTSC_SUSP 0x1000 /* Suspend */
/* Legacy support register */
#define USBLEGSUP 0xc0
#define USBLEGSUP_DEFAULT 0x2000 /* only PIRQ enable set */
#define UHCI_NULL_DATA_SIZE 0x7ff /* for UHCI controller TD */
#define UHCI_PID 0xff /* PID MASK */
#define UHCI_PTR_BITS 0x000F
#define UHCI_PTR_TERM 0x0001
#define UHCI_PTR_QH 0x0002
#define UHCI_PTR_DEPTH 0x0004
#define UHCI_NUMFRAMES 1024 /* in the frame list [array] */
#define UHCI_MAX_SOF_NUMBER 2047 /* in an SOF packet */
#define CAN_SCHEDULE_FRAMES 1000 /* how far future frames can be scheduled */
/* for TD <status> */
#define TD_CTRL_SPD (1 << 29) /* Short Packet Detect */
#define TD_CTRL_C_ERR_MASK (3 << 27) /* Error Counter bits */
#define TD_CTRL_LS (1 << 26) /* Low Speed Device */
#define TD_CTRL_IOS (1 << 25) /* Isochronous Select */
#define TD_CTRL_IOC (1 << 24) /* Interrupt on Complete */
#define TD_CTRL_ACTIVE (1 << 23) /* TD Active */
#define TD_CTRL_STALLED (1 << 22) /* TD Stalled */
#define TD_CTRL_DBUFERR (1 << 21) /* Data Buffer Error */
#define TD_CTRL_BABBLE (1 << 20) /* Babble Detected */
#define TD_CTRL_NAK (1 << 19) /* NAK Received */
#define TD_CTRL_CRCTIMEO (1 << 18) /* CRC/Time Out Error */
#define TD_CTRL_BITSTUFF (1 << 17) /* Bit Stuff Error */
#define TD_CTRL_ACTLEN_MASK 0x7ff /* actual length, encoded as n - 1 */
#define TD_CTRL_ANY_ERROR (TD_CTRL_STALLED | TD_CTRL_DBUFERR | \
TD_CTRL_BABBLE | TD_CTRL_CRCTIME | TD_CTRL_BITSTUFF)
#define uhci_status_bits(ctrl_sts) (ctrl_sts & 0xFE0000)
#define uhci_actual_length(desc) ((le32_to_cpu(desc->hw.td.status) + 1) & TD_CTRL_ACTLEN_MASK) /* 1-based */
/* for TD <flags>: */
#define UHCI_TD_REMOVE 0x0001 /* Remove when done */
/* for TD <info>: (a.k.a. Token) */
#define TD_TOKEN_TOGGLE 19
#define uhci_maxlen(token) ((token) >> 21)
#define uhci_toggle(token) (((token) >> TD_TOKEN_TOGGLE) & 1)
#define uhci_endpoint(token) (((token) >> 15) & 0xf)
#define uhci_devaddr(token) (((token) >> 8) & 0x7f)
#define uhci_devep(token) (((token) >> 8) & 0x7ff)
#define uhci_packetid(token) ((token) & 0xff)
#define uhci_packetout(token) (uhci_packetid(token) != USB_PID_IN)
#define uhci_packetin(token) (uhci_packetid(token) == USB_PID_IN)
#define uhci_do_toggle(urb) usb_dotoggle (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe))
#define uhci_get_toggle(urb) usb_gettoggle (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe))
/* ------------------------------------------------------------------------------------
TD/QH-structures
------------------------------------------------------------------------------------ */
typedef enum {
TD_TYPE, QH_TYPE
} uhci_desc_type_t;
typedef struct {
__u32 link;
__u32 status;
__u32 info;
__u32 buffer;
} uhci_td_t, *puhci_td_t;
typedef struct {
__u32 head;
__u32 element; /* Queue element pointer */
} uhci_qh_t, *puhci_qh_t;
typedef struct {
union {
uhci_td_t td;
uhci_qh_t qh;
} hw;
uhci_desc_type_t type;
dma_addr_t dma_addr;
struct list_head horizontal;
struct list_head vertical;
struct list_head desc_list;
int last_used;
} uhci_desc_t, *puhci_desc_t;
typedef struct {
struct list_head desc_list; // list pointer to all corresponding TDs/QHs associated with this request
struct list_head urb_list;
struct urb *urb; // urb to which this data belongs
dma_addr_t setup_packet_dma;
dma_addr_t transfer_buffer_dma;
unsigned long started;
struct urb *next_queued_urb; // next queued urb for this EP
struct urb *prev_queued_urb;
uhci_desc_t *bottom_qh;
uhci_desc_t *next_qh; // next helper QH
char use_loop;
char flags;
} urb_priv_t, *purb_priv_t;
struct uhci_hcd {
unsigned int maxports;
int running;
int apm_state;
struct uhci_hcd *next; // chain of uhci device contexts
spinlock_t urb_list_lock; // lock to keep consistency
spinlock_t qh_lock;
spinlock_t td_lock;
atomic_t avoid_bulk;
__u32 *framelist;
dma_addr_t framelist_dma;
uhci_desc_t **iso_td;
uhci_desc_t *int_chain[8];
uhci_desc_t *ls_control_chain;
uhci_desc_t *control_chain;
uhci_desc_t *bulk_chain;
uhci_desc_t *chain_end;
uhci_desc_t *td1ms;
uhci_desc_t *td32ms;
uhci_desc_t *td128ms;
struct list_head urb_list; // list of all pending urbs
struct list_head free_desc_qh; // Cool down pool for QH
struct list_head free_desc_td; // Cool down pool for ISO/INT-TDs
struct list_head urb_unlinked; // list of all unlinked urbs
struct pci_dev *uhci_pci;
struct pci_pool *desc_pool;
int unlink_urb_done;
int loop_usage; // URBs using bandwidth reclamation
long timeout_check;
int timeout_urbs;
long last_error_time; // last error output in uhci_interrupt()
long last_hcd_irq;
int reanimations;
int need_init;
// Framework state
struct usb_hcd hcd;
};
#define hcd_to_uhci(hcd_ptr) list_entry(hcd_ptr, struct uhci_hcd, hcd)
#define MAKE_TD_ADDR(a) ((a)->dma_addr&~UHCI_PTR_QH)
#define MAKE_QH_ADDR(a) ((a)->dma_addr|UHCI_PTR_QH)
#define UHCI_GET_CURRENT_FRAME(uhci) (inw ((int)(uhci->hcd.regs) + USBFRNUM))
#define CLEAN_TRANSFER_NO_DELETION 0
#define CLEAN_TRANSFER_REGULAR 1
#define CLEAN_TRANSFER_DELETION_MARK 2
#define CLEAN_NOT_FORCED 0
#define CLEAN_FORCED 1
#define PROCESS_ISO_REGULAR 0
#define PROCESS_ISO_FORCE 1
#define PROCESS_INT_REGULAR 0
#define PROCESS_INT_REMOVE 1
#define UNLINK_ASYNC_STORE_URB 0
#define UNLINK_ASYNC_DONT_STORE 1
#define is_td_active(desc) (desc->hw.td.status & cpu_to_le32(TD_CTRL_ACTIVE))
#define set_qh_head(desc,val) (desc)->hw.qh.head=cpu_to_le32(val)
#define set_qh_element(desc,val) (desc)->hw.qh.element=cpu_to_le32(val)
#define set_td_link(desc,val) (desc)->hw.td.link=cpu_to_le32(val)
#define set_td_ioc(desc) (desc)->hw.td.status |= cpu_to_le32(TD_CTRL_IOC)
#define clr_td_ioc(desc) (desc)->hw.td.status &= cpu_to_le32(~TD_CTRL_IOC)
#endif
drivers/usb/host/usb-uhci-hub.c 0 → 100644
View file @ a96a4b53
/*
UHCI HCD (Host Controller Driver) for USB, UHCI Root Hub
(c) 1999-2002
Georg Acher + Deti Fliegl + Thomas Sailer
georg@acher.org deti@fliegl.de sailer@ife.ee.ethz.ch
with the help of
David Brownell, david-b@pacbell.net
Adam Richter, adam@yggdrasil.com
Roman Weissgaerber, weissg@vienna.at
HW-initalization based on material of
Randy Dunlap + Johannes Erdfelt + Gregory P. Smith + Linus Torvalds
$Id: usb-uhci-hub.c,v 1.1 2002/05/14 20:36:57 acher Exp $
*/
#define CLR_RH_PORTSTAT(x) \
status = inw(io_addr+USBPORTSC1+2*(wIndex-1)); \
status = (status & 0xfff5) & ~(x); \
outw(status, io_addr+USBPORTSC1+2*(wIndex-1))
#define SET_RH_PORTSTAT(x) \
status = inw(io_addr+USBPORTSC1+2*(wIndex-1)); \
status = (status & 0xfff5) | (x); \
outw(status, io_addr+USBPORTSC1+2*(wIndex-1))
static int oldval=-1;
/* build "status change" packet (one or two bytes) from HC registers
Since uhci_hub_status_data is called by a SW timer, it is also used
for monitoring HC health */
static int uhci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
unsigned int io_addr = (int)uhci->hcd.regs;
int i, len=0, data = 0, portstate;
int changed=0;
for (i = 0; i < uhci->maxports; i++) {
portstate=inw (io_addr + USBPORTSC1 + i * 2);
#if 0
if (i==0 && (portstate&0xf) != (oldval&0xf))
err("Port %i: %x", i+1, portstate);
#endif
if (i==0)
oldval=portstate;
if ((portstate & 0xa) > 0) {
changed=1;
}
data |= ((portstate & 0xa) > 0 ? (1 << (i + 1)) : 0);
len = (i + 1) / 8 + 1;
}
*(__u16 *)buf = cpu_to_le16 (data);
// Watchdog
if (uhci->running && time_after(jiffies, uhci->last_hcd_irq + WATCHDOG_TIMEOUT)) {
if (uhci->reanimations > MAX_REANIMATIONS) {
err("He's dead, Jim. Giving up reanimating the UHCI host controller.\n"
"Maybe a real module reload helps...");
uhci->running = 0;
}
else {
uhci->running = 0;
uhci->need_init=1; // init done in the next submit_urb
}
}
return changed?len:0;
}
/*-------------------------------------------------------------------------*/
static void uhci_hub_descriptor (struct uhci_hcd *uhci, struct usb_hub_descriptor *desc)
{
int ports = uhci->maxports;
u16 temp;
desc->bDescriptorType = 0x29;
desc->bPwrOn2PwrGood = 1;
desc->bHubContrCurrent = 0;
desc->bNbrPorts = ports;
temp = 1 + (ports / 8);
desc->bDescLength = 7 + 2 * temp;
desc->wHubCharacteristics = 0;
desc-> bitmap[0] = 0;
desc-> bitmap[1] = 0xff;
}
/*-------------------------------------------------------------------------*/
static int uhci_hub_control (
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength)
{
struct uhci_hcd *uhci = hcd_to_uhci (hcd);
int status = 0;
int stat = 0;
int cstatus;
unsigned int io_addr = (int)uhci->hcd.regs;
int ports = uhci->maxports;
switch (typeReq) {
case ClearHubFeature:
break;
case ClearPortFeature:
if (!wIndex || wIndex > ports)
goto error;
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
CLR_RH_PORTSTAT (USBPORTSC_PE);
break;
case USB_PORT_FEAT_C_ENABLE:
SET_RH_PORTSTAT (USBPORTSC_PEC);
break;
case USB_PORT_FEAT_SUSPEND:
CLR_RH_PORTSTAT (USBPORTSC_SUSP);
break;
case USB_PORT_FEAT_C_SUSPEND:
/*** WR_RH_PORTSTAT(RH_PS_PSSC); */
break;
case USB_PORT_FEAT_POWER:
break;/* port power ** */
case USB_PORT_FEAT_C_CONNECTION:
SET_RH_PORTSTAT (USBPORTSC_CSC);
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
break; /* port power over current ** */
case USB_PORT_FEAT_C_RESET:
break;
default:
goto error;
}
break;
case GetHubDescriptor:
uhci_hub_descriptor (uhci, (struct usb_hub_descriptor *) buf);
break;
case GetHubStatus:
*(u32 *) buf = cpu_to_le32 (0);
break;
case GetPortStatus:
if (!wIndex || wIndex > ports)
goto error;
status = inw (io_addr + USBPORTSC1 + 2 * (wIndex - 1));
cstatus = ((status & USBPORTSC_CSC) >> (1 - 0)) |
((status & USBPORTSC_PEC) >> (3 - 1));
status = (status & USBPORTSC_CCS) |
((status & USBPORTSC_PE) >> (2 - 1)) |
((status & USBPORTSC_SUSP) >> (12 - 2)) |
((status & USBPORTSC_PR) >> (9 - 4)) |
(1 << 8) | /* power on ** */
((status & USBPORTSC_LSDA) << (-8 + 9));
*(__u16 *) buf = cpu_to_le16 (status);
*(__u16 *) (buf + 2) = cpu_to_le16 (cstatus);
break;
case SetHubFeature:
// FIXME
break;
case SetPortFeature:
if (!wIndex || wIndex > ports)
goto error;
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
SET_RH_PORTSTAT (USBPORTSC_SUSP);
break;
case USB_PORT_FEAT_RESET:
SET_RH_PORTSTAT (USBPORTSC_PR);
uhci_wait_ms (10);
CLR_RH_PORTSTAT (USBPORTSC_PR);
udelay (10);
SET_RH_PORTSTAT (USBPORTSC_PE);
uhci_wait_ms (10);
SET_RH_PORTSTAT (0xa);
break;
case USB_PORT_FEAT_POWER:
break; /* port power ** */
case USB_PORT_FEAT_ENABLE:
SET_RH_PORTSTAT (USBPORTSC_PE);
break;
default:
goto error;
}
break;
default:
error:
stat = -EPIPE;
}
dbg("Root-Hub stat port1: %x port2: %x",
inw (io_addr + USBPORTSC1), inw (io_addr + USBPORTSC2));
return stat;
}
drivers/usb/host/usb-uhci-mem.c 0 → 100644
View file @ a96a4b53
/*
UHCI HCD (Host Controller Driver) for USB
UHCI memory allocation and basic descriptor handling
(c) 1999-2002
Georg Acher + Deti Fliegl + Thomas Sailer
georg@acher.org deti@fliegl.de sailer@ife.ee.ethz.ch
with the help of
David Brownell, david-b@pacbell.net
Adam Richter, adam@yggdrasil.com
Roman Weissgaerber, weissg@vienna.at
HW-initalization based on material of
Randy Dunlap + Johannes Erdfelt + Gregory P. Smith + Linus Torvalds
$Id: usb-uhci-mem.c,v 1.1 2002/05/14 20:36:57 acher Exp $
*/
/*###########################################################################*/
// UHCI STRUCTURE
/*###########################################################################*/
static struct usb_hcd *uhci_hcd_alloc (void)
{
struct uhci_hcd *uhci;
int len;
len=sizeof (struct uhci_hcd);
uhci = (struct uhci_hcd *) kmalloc (len, GFP_KERNEL);
if (uhci == 0)
return NULL;
memset (uhci, 0, len);
init_dbg("uhci @ %p, hcd @ %p",uhci, &(uhci->hcd));
INIT_LIST_HEAD (&uhci->free_desc_qh);
INIT_LIST_HEAD (&uhci->free_desc_td);
INIT_LIST_HEAD (&uhci->urb_list);
INIT_LIST_HEAD (&uhci->urb_unlinked);
spin_lock_init (&uhci->urb_list_lock);
spin_lock_init (&uhci->qh_lock);
spin_lock_init (&uhci->td_lock);
atomic_set(&uhci->avoid_bulk, 0);
return &(uhci->hcd);
}
/*-------------------------------------------------------------------*/
static void uhci_hcd_free (struct usb_hcd *hcd)
{
kfree (hcd_to_uhci (hcd));
}
/*###########################################################################*/
// DMA/PCI CONSISTENCY
/*###########################################################################*/
static void uhci_urb_dma_sync(struct uhci_hcd *uhci, struct urb *urb, urb_priv_t *urb_priv)
{
if (urb_priv->setup_packet_dma)
pci_dma_sync_single(uhci->uhci_pci, urb_priv->setup_packet_dma,
sizeof(struct usb_ctrlrequest), PCI_DMA_TODEVICE);
if (urb_priv->transfer_buffer_dma)
pci_dma_sync_single(uhci->uhci_pci, urb_priv->transfer_buffer_dma,
urb->transfer_buffer_length,
usb_pipein(urb->pipe) ?
PCI_DMA_FROMDEVICE :
PCI_DMA_TODEVICE);
}
/*-------------------------------------------------------------------*/
static void uhci_urb_dma_unmap(struct uhci_hcd *uhci, struct urb *urb, urb_priv_t *urb_priv)
{
if (urb_priv->setup_packet_dma) {
pci_unmap_single(uhci->uhci_pci, urb_priv->setup_packet_dma,
sizeof(struct usb_ctrlrequest), PCI_DMA_TODEVICE);
urb_priv->setup_packet_dma = 0;
}
if (urb_priv->transfer_buffer_dma) {
pci_unmap_single(uhci->uhci_pci, urb_priv->transfer_buffer_dma,
urb->transfer_buffer_length,
usb_pipein(urb->pipe) ?
PCI_DMA_FROMDEVICE :
PCI_DMA_TODEVICE);
urb_priv->transfer_buffer_dma = 0;
}
}
/*###########################################################################*/
// TRANSFER DESCRIPTORS (TD)
/*###########################################################################*/
static void fill_td (uhci_desc_t *td, int status, int info, __u32 buffer)
{
td->hw.td.status = cpu_to_le32(status);
td->hw.td.info = cpu_to_le32(info);
td->hw.td.buffer = cpu_to_le32(buffer);
}
/*-------------------------------------------------------------------*/
static int alloc_td (struct uhci_hcd *uhci, uhci_desc_t ** new, int flags)
{
dma_addr_t dma_handle;
*new = pci_pool_alloc(uhci->desc_pool, GFP_DMA | GFP_ATOMIC, &dma_handle);
if (!*new)
return -ENOMEM;
memset (*new, 0, sizeof (uhci_desc_t));
(*new)->dma_addr = dma_handle;
set_td_link((*new), UHCI_PTR_TERM | (flags & UHCI_PTR_BITS)); // last by default
(*new)->type = TD_TYPE;
mb();
INIT_LIST_HEAD (&(*new)->vertical);
INIT_LIST_HEAD (&(*new)->horizontal);
return 0;
}
/*-------------------------------------------------------------------*/
/* insert td at last position in td-list of qh (vertical) */
static int insert_td (struct uhci_hcd *uhci, uhci_desc_t *qh, uhci_desc_t* new, int flags)
{
uhci_desc_t *prev;
unsigned long cpuflags;
spin_lock_irqsave (&uhci->td_lock, cpuflags);
list_add_tail (&new->vertical, &qh->vertical);
prev = list_entry (new->vertical.prev, uhci_desc_t, vertical);
if (qh == prev ) {
// virgin qh without any tds
set_qh_element(qh, new->dma_addr | UHCI_PTR_TERM);
}
else {
// already tds inserted, implicitely remove TERM bit of prev
set_td_link(prev, new->dma_addr | (flags & UHCI_PTR_DEPTH));
}
mb();
spin_unlock_irqrestore (&uhci->td_lock, cpuflags);
return 0;
}
/*-------------------------------------------------------------------*/
/* insert new_td after td (horizontal) */
static int insert_td_horizontal (struct uhci_hcd *uhci, uhci_desc_t *td, uhci_desc_t* new)
{
uhci_desc_t *next;
unsigned long flags;
spin_lock_irqsave (&uhci->td_lock, flags);
next = list_entry (td->horizontal.next, uhci_desc_t, horizontal);
list_add (&new->horizontal, &td->horizontal);
new->hw.td.link = td->hw.td.link;
mb();
set_td_link(td, new->dma_addr);
mb();
spin_unlock_irqrestore (&uhci->td_lock, flags);
return 0;
}
/*-------------------------------------------------------------------*/
static int unlink_td (struct uhci_hcd *uhci, uhci_desc_t *element, int phys_unlink)
{
uhci_desc_t *next, *prev;
int dir = 0;
unsigned long flags;
spin_lock_irqsave (&uhci->td_lock, flags);
next = list_entry (element->vertical.next, uhci_desc_t, vertical);
if (next == element) {
dir = 1;
prev = list_entry (element->horizontal.prev, uhci_desc_t, horizontal);
}
else
prev = list_entry (element->vertical.prev, uhci_desc_t, vertical);
if (phys_unlink) {
// really remove HW linking
if (prev->type == TD_TYPE) {
prev->hw.td.link = element->hw.td.link;
}
else
prev->hw.qh.element = element->hw.td.link;
}
mb ();
if (dir == 0)
list_del (&element->vertical);
else
list_del (&element->horizontal);
spin_unlock_irqrestore (&uhci->td_lock, flags);
return 0;
}
/*###########################################################################*/
// QUEUE HEADS (QH)
/*###########################################################################*/
// Allocates qh element
static int alloc_qh (struct uhci_hcd *uhci, uhci_desc_t ** new)
{
dma_addr_t dma_handle;
*new = pci_pool_alloc(uhci->desc_pool, GFP_DMA | GFP_ATOMIC, &dma_handle);
if (!*new)
return -ENOMEM;
memset (*new, 0, sizeof (uhci_desc_t));
(*new)->dma_addr = dma_handle;
set_qh_head(*new, UHCI_PTR_TERM);
set_qh_element(*new, UHCI_PTR_TERM);
(*new)->type = QH_TYPE;
mb();
INIT_LIST_HEAD (&(*new)->horizontal);
INIT_LIST_HEAD (&(*new)->vertical);
dbg("Allocated qh @ %p", *new);
return 0;
}
/*-------------------------------------------------------------------*/
// inserts new qh before/after the qh at pos
// flags: 0: insert before pos, 1: insert after pos (for low speed transfers)
static int insert_qh (struct uhci_hcd *uhci, uhci_desc_t *pos, uhci_desc_t *new, int order)
{
uhci_desc_t *old;
unsigned long flags;
spin_lock_irqsave (&uhci->qh_lock, flags);
if (!order) {
// (OLD) (POS) -> (OLD) (NEW) (POS)
old = list_entry (pos->horizontal.prev, uhci_desc_t, horizontal);
list_add_tail (&new->horizontal, &pos->horizontal);
set_qh_head(new, MAKE_QH_ADDR (pos)) ;
mb();
if (!(old->hw.qh.head & cpu_to_le32(UHCI_PTR_TERM)))
set_qh_head(old, MAKE_QH_ADDR (new)) ;
}
else {
// (POS) (OLD) -> (POS) (NEW) (OLD)
old = list_entry (pos->horizontal.next, uhci_desc_t, horizontal);
list_add (&new->horizontal, &pos->horizontal);
set_qh_head(new, MAKE_QH_ADDR (old));
mb();
set_qh_head(pos, MAKE_QH_ADDR (new)) ;
}
mb ();
spin_unlock_irqrestore (&uhci->qh_lock, flags);
return 0;
}
/*-------------------------------------------------------------------*/
// append a qh to td.link physically, the SW linkage is not affected
static void append_qh(struct uhci_hcd *uhci, uhci_desc_t *td, uhci_desc_t* qh, int flags)
{
unsigned long cpuflags;
spin_lock_irqsave (&uhci->td_lock, cpuflags);
set_td_link(td, qh->dma_addr | (flags & UHCI_PTR_DEPTH) | UHCI_PTR_QH);
mb();
spin_unlock_irqrestore (&uhci->td_lock, cpuflags);
}
/*-------------------------------------------------------------------*/
static int unlink_qh (struct uhci_hcd *uhci, uhci_desc_t *element)
{
uhci_desc_t *prev;
unsigned long flags;
__u32 old_head;
spin_lock_irqsave (&uhci->qh_lock, flags);
prev = list_entry (element->horizontal.prev, uhci_desc_t, horizontal);
old_head = element->hw.qh.head;
element->hw.qh.head = UHCI_PTR_TERM;
mb();
prev->hw.qh.head = old_head;
dbg("unlink qh %p, pqh %p, nxqh %p, to %08x", element, prev,
list_entry (element->horizontal.next, uhci_desc_t, horizontal),
le32_to_cpu(element->hw.qh.head) &~15);
list_del(&element->horizontal);
mb ();
spin_unlock_irqrestore (&uhci->qh_lock, flags);
return 0;
}
/*-------------------------------------------------------------------*/
static int delete_desc (struct uhci_hcd *uhci, uhci_desc_t *element)
{
pci_pool_free(uhci->desc_pool, element, element->dma_addr);
return 0;
}
/*-------------------------------------------------------------------*/
static int delete_qh (struct uhci_hcd *uhci, uhci_desc_t *qh)
{
uhci_desc_t *td;
struct list_head *p;
int n=0;
list_del (&qh->horizontal);
while ((p = qh->vertical.next) != &qh->vertical && n<10000) {
td = list_entry (p, uhci_desc_t, vertical);
dbg("unlink td @ %p",td);
unlink_td (uhci, td, 0); // no physical unlink
delete_desc (uhci, td);
n++;
}
// never trust any software, not even your own...
if (n>=10000)
err("delete_qh: Garbage in QH list, giving up");
delete_desc (uhci, qh);
return 0;
}
/*###########################################################################*/
// DESCRIPTOR CHAINING HELPERS
/*###########################################################################*/
static void clean_td_chain (struct uhci_hcd *uhci, uhci_desc_t *td)
{
struct list_head *p;
uhci_desc_t *td1;
if (!td)
return;
while ((p = td->horizontal.next) != &td->horizontal) {
td1 = list_entry (p, uhci_desc_t, horizontal);
delete_desc (uhci, td1);
}
delete_desc (uhci, td);
}
/*-------------------------------------------------------------------*/
// Cleans up collected QHs/TDs, but not more than 100 in one go
void clean_descs(struct uhci_hcd *uhci, int force)
{
struct list_head *q;
uhci_desc_t *qh,*td;
int now=UHCI_GET_CURRENT_FRAME(uhci), n=0;
q=uhci->free_desc_qh.prev;
while (q != &uhci->free_desc_qh && (force || n<100)) {
qh = list_entry (q, uhci_desc_t, horizontal);
q=qh->horizontal.prev;
if ((qh->last_used!=now) || force) {
delete_qh(uhci,qh);
}
n++;
}
q=uhci->free_desc_td.prev;
n=0;
while (q != &uhci->free_desc_td && (force || n<100)) {
td = list_entry (q, uhci_desc_t, horizontal);
q=td->horizontal.prev;
if (((td->last_used!=now)&&(td->last_used+1!=now)) || force) {
list_del (&td->horizontal);
delete_desc(uhci,td);
}
n++;
}
}
/*-------------------------------------------------------------------*/
static void uhci_switch_timer_int(struct uhci_hcd *uhci)
{
if (!list_empty(&uhci->urb_unlinked))
set_td_ioc(uhci->td1ms);
else
clr_td_ioc(uhci->td1ms);
if (uhci->timeout_urbs)
set_td_ioc(uhci->td32ms);
else
clr_td_ioc(uhci->td32ms);
wmb();
}
/*-------------------------------------------------------------------*/
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
static void enable_desc_loop(struct uhci_hcd *uhci, struct urb *urb)
{
int flags;
if (urb->transfer_flags & USB_NO_FSBR)
return;
spin_lock_irqsave (&uhci->qh_lock, flags);
uhci->chain_end->hw.qh.head&=cpu_to_le32(~UHCI_PTR_TERM);
mb();
uhci->loop_usage++;
((urb_priv_t*)urb->hcpriv)->use_loop=1;
spin_unlock_irqrestore (&uhci->qh_lock, flags);
}
/*-------------------------------------------------------------------*/
static void disable_desc_loop(struct uhci_hcd *uhci, struct urb *urb)
{
int flags;
if (urb->transfer_flags & USB_NO_FSBR)
return;
spin_lock_irqsave (&uhci->qh_lock, flags);
if (((urb_priv_t*)urb->hcpriv)->use_loop) {
uhci->loop_usage--;
if (!uhci->loop_usage) {
uhci->chain_end->hw.qh.head|=cpu_to_le32(UHCI_PTR_TERM);
mb();
}
((urb_priv_t*)urb->hcpriv)->use_loop=0;
}
spin_unlock_irqrestore (&uhci->qh_lock, flags);
}
#endif
/*-------------------------------------------------------------------*/
static void queue_urb_unlocked (struct uhci_hcd *uhci, struct urb *urb)
{
urb_priv_t *priv=(urb_priv_t*)urb->hcpriv;
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
int type;
type=usb_pipetype (urb->pipe);
if ((type == PIPE_BULK) || (type == PIPE_CONTROL))
enable_desc_loop(uhci, urb);
#endif
urb->status = -EINPROGRESS;
priv->started=jiffies;
list_add (&priv->urb_list, &uhci->urb_list);
if (urb->timeout)
uhci->timeout_urbs++;
uhci_switch_timer_int(uhci);
}
/*-------------------------------------------------------------------*/
static void queue_urb (struct uhci_hcd *uhci, struct urb *urb)
{
unsigned long flags=0;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
queue_urb_unlocked(uhci,urb);
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
}
/*-------------------------------------------------------------------*/
static void dequeue_urb (struct uhci_hcd *uhci, struct urb *urb)
{
urb_priv_t *priv=(urb_priv_t*)urb->hcpriv;
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
int type;
dbg("dequeue URB %p",urb);
type=usb_pipetype (urb->pipe);
if ((type == PIPE_BULK) || (type == PIPE_CONTROL))
disable_desc_loop(uhci, urb);
#endif
list_del (&priv->urb_list);
if (urb->timeout && uhci->timeout_urbs)
uhci->timeout_urbs--;
}
/*###########################################################################*/
// INIT/FREE FRAME LAYOUT IN MEMORY
/*###########################################################################*/
// Removes ALL qhs in chain (paranoia!)
static void cleanup_skel (struct uhci_hcd *uhci)
{
unsigned int n;
uhci_desc_t *td;
dbg("cleanup_skel");
clean_descs(uhci,1);
dbg("clean_descs done");
if (uhci->td32ms) {
unlink_td(uhci,uhci->td32ms,1);
delete_desc(uhci, uhci->td32ms);
}
if (uhci->td128ms) {
unlink_td(uhci,uhci->td128ms,1);
delete_desc(uhci, uhci->td128ms);
}
for (n = 0; n < 8; n++) {
td = uhci->int_chain[n];
clean_td_chain (uhci, td);
}
if (uhci->iso_td) {
for (n = 0; n < 1024; n++) {
td = uhci->iso_td[n];
clean_td_chain (uhci, td);
}
kfree (uhci->iso_td);
}
if (uhci->framelist)
pci_free_consistent(uhci->uhci_pci, PAGE_SIZE,
uhci->framelist, uhci->framelist_dma);
if (uhci->control_chain) {
// completed init_skel?
struct list_head *p;
uhci_desc_t *qh, *qh1;
qh = uhci->control_chain;
while ((p = qh->horizontal.next) != &qh->horizontal) {
qh1 = list_entry (p, uhci_desc_t, horizontal);
delete_qh (uhci, qh1);
}
delete_qh (uhci, qh);
}
else {
if (uhci->ls_control_chain)
delete_desc (uhci, uhci->ls_control_chain);
if (uhci->control_chain)
delete_desc (uhci, uhci->control_chain);
if (uhci->bulk_chain)
delete_desc (uhci, uhci->bulk_chain);
if (uhci->chain_end)
delete_desc (uhci, uhci->chain_end);
}
if (uhci->desc_pool) {
pci_pool_destroy(uhci->desc_pool);
uhci->desc_pool = NULL;
}
uhci->ls_control_chain = NULL;
uhci->control_chain = NULL;
uhci->bulk_chain = NULL;
uhci->chain_end = NULL;
for (n = 0; n < 8; n++)
uhci->int_chain[n] = NULL;
dbg("cleanup_skel finished");
}
/*-------------------------------------------------------------------*/
// allocates framelist and qh-skeletons
// only HW-links provide continous linking, SW-links stay in their domain (ISO/INT)
static int init_skel (struct uhci_hcd *uhci)
{
int n, ret;
uhci_desc_t *qh, *td;
init_dbg("init_skel");
uhci->framelist = pci_alloc_consistent(uhci->uhci_pci, PAGE_SIZE,
&uhci->framelist_dma);
if (!uhci->framelist)
return -ENOMEM;
memset (uhci->framelist, 0, 4096);
init_dbg("creating descriptor pci_pool");
uhci->desc_pool = pci_pool_create("uhci_desc", uhci->uhci_pci,
sizeof(uhci_desc_t), 16, 0,
GFP_DMA | GFP_ATOMIC);
if (!uhci->desc_pool)
goto init_skel_cleanup;
init_dbg("allocating iso desc pointer list");
uhci->iso_td = (uhci_desc_t **) kmalloc (1024 * sizeof (uhci_desc_t*), GFP_KERNEL);
if (!uhci->iso_td)
goto init_skel_cleanup;
uhci->ls_control_chain = NULL;
uhci->control_chain = NULL;
uhci->bulk_chain = NULL;
uhci->chain_end = NULL;
for (n = 0; n < 8; n++)
uhci->int_chain[n] = NULL;
init_dbg("allocating iso descs");
for (n = 0; n < 1024; n++) {
// allocate skeleton iso/irq-tds
if (alloc_td (uhci, &td, 0))
goto init_skel_cleanup;
uhci->iso_td[n] = td;
uhci->framelist[n] = cpu_to_le32((__u32) td->dma_addr);
}
init_dbg("allocating qh: chain_end");
if (alloc_qh (uhci, &qh))
goto init_skel_cleanup;
uhci->chain_end = qh;
if (alloc_td (uhci, &td, 0))
goto init_skel_cleanup;
fill_td (td, 0 * TD_CTRL_IOC, 0, 0); // generate 1ms interrupt (enabled on demand)
insert_td (uhci, qh, td, 0);
qh->hw.qh.element &= cpu_to_le32(~UHCI_PTR_TERM); // remove TERM bit
uhci->td1ms=td;
dbg("allocating qh: bulk_chain");
if (alloc_qh (uhci, &qh))
goto init_skel_cleanup;
insert_qh (uhci, uhci->chain_end, qh, 0);
uhci->bulk_chain = qh;
dbg("allocating qh: control_chain");
if ((ret = alloc_qh (uhci, &qh)))
goto init_skel_cleanup;
insert_qh (uhci, uhci->bulk_chain, qh, 0);
uhci->control_chain = qh;
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
// disabled reclamation loop
set_qh_head(uhci->chain_end, uhci->control_chain->dma_addr | UHCI_PTR_QH | UHCI_PTR_TERM);
#endif
init_dbg("allocating qh: ls_control_chain");
if (alloc_qh (uhci, &qh))
goto init_skel_cleanup;
insert_qh (uhci, uhci->control_chain, qh, 0);
uhci->ls_control_chain = qh;
init_dbg("allocating skeleton INT-TDs");
for (n = 0; n < 8; n++) {
uhci_desc_t *td;
if (alloc_td (uhci, &td, 0))
goto init_skel_cleanup;
uhci->int_chain[n] = td;
if (n == 0) {
set_td_link(uhci->int_chain[0], uhci->ls_control_chain->dma_addr | UHCI_PTR_QH);
}
else {
set_td_link(uhci->int_chain[n], uhci->int_chain[0]->dma_addr);
}
}
init_dbg("Linking skeleton INT-TDs");
for (n = 0; n < 1024; n++) {
// link all iso-tds to the interrupt chains
int m, o;
dbg("framelist[%i]=%x",n,le32_to_cpu(uhci->framelist[n]));
if ((n&127)==127)
((uhci_desc_t*) uhci->iso_td[n])->hw.td.link = cpu_to_le32(uhci->int_chain[0]->dma_addr);
else
for (o = 1, m = 2; m <= 128; o++, m += m)
if ((n & (m - 1)) == ((m - 1) / 2))
set_td_link(((uhci_desc_t*) uhci->iso_td[n]), uhci->int_chain[o]->dma_addr);
}
if (alloc_td (uhci, &td, 0))
goto init_skel_cleanup;
fill_td (td, 0 * TD_CTRL_IOC, 0, 0); // generate 32ms interrupt (activated later)
uhci->td32ms=td;
insert_td_horizontal (uhci, uhci->int_chain[5], td);
if (alloc_td (uhci, &td, 0))
goto init_skel_cleanup;
fill_td (td, 0 * TD_CTRL_IOC, 0, 0); // generate 128ms interrupt (activated later)
uhci->td128ms=td;
insert_td_horizontal (uhci, uhci->int_chain[7], td);
mb();
init_dbg("init_skel exit");
return 0;
init_skel_cleanup:
cleanup_skel (uhci);
return -ENOMEM;
}
/*###########################################################################*/
// UHCI PRIVATE DATA
/*###########################################################################*/
urb_priv_t *uhci_alloc_priv(int mem_flags)
{
urb_priv_t *p;
#ifdef DEBUG_SLAB
p = kmem_cache_alloc(urb_priv_kmem, SLAB_FLAG);
#else
p = kmalloc (sizeof (urb_priv_t), mem_flags);
#endif
if (p) {
memset(p, 0, sizeof(urb_priv_t));
INIT_LIST_HEAD (&p->urb_list);
}
return p;
}
/*-------------------------------------------------------------------*/
void uhci_free_priv(struct uhci_hcd *uhci, struct urb *urb, urb_priv_t* p)
{
uhci_urb_dma_unmap(uhci, urb, p);
#ifdef DEBUG_SLAB
err("free_priv %p",p);
kmem_cache_free(urb_priv_kmem, p);
#else
kfree (p);
#endif
urb->hcpriv = NULL;
}
drivers/usb/host/usb-uhci-q.c 0 → 100644
View file @ a96a4b53
/*
UHCI HCD (Host Controller Driver) for USB, UHCI transfer processing
(c) 1999-2002
Georg Acher + Deti Fliegl + Thomas Sailer
georg@acher.org deti@fliegl.de sailer@ife.ee.ethz.ch
with the help of
David Brownell, david-b@pacbell.net
Adam Richter, adam@yggdrasil.com
Roman Weissgaerber, weissg@vienna.at
HW-initalization based on material of
Randy Dunlap + Johannes Erdfelt + Gregory P. Smith + Linus Torvalds
$Id: usb-uhci-q.c,v 1.1 2002/05/14 20:36:57 acher Exp $
*/
/*-------------------------------------------------------------------*/
static inline void finish_urb (struct uhci_hcd *uhci, struct urb *urb)
{
if (urb->hcpriv)
uhci_free_priv (uhci, urb, urb->hcpriv);
usb_hcd_giveback_urb (&uhci->hcd, urb);
}
/*###########################################################################*/
// URB SUBMISSION STUFF
// assembles QHs und TDs for control, bulk, interrupt and isochronous
/*###########################################################################*/
// returns: 0 (no transfer queued), urb* (this urb already queued)
static struct urb* search_dev_ep (struct uhci_hcd *uhci, struct urb *urb)
{
struct list_head *p;
struct urb *tmp;
urb_priv_t *priv;
unsigned int mask = usb_pipecontrol(urb->pipe) ? (~USB_DIR_IN) : (~0);
p=uhci->urb_list.next;
for (; p != &uhci->urb_list; p = p->next) {
priv = list_entry (p, urb_priv_t, urb_list);
tmp = priv->urb;
dbg("search_dev_ep urb: %p", tmp);
// we can accept this urb if it is not queued at this time
// or if non-iso transfer requests should be scheduled for the same device and pipe
if ((!usb_pipeisoc(urb->pipe) && (tmp->dev == urb->dev) && !((tmp->pipe ^ urb->pipe) & mask)) ||
(urb == tmp))
return tmp; // found another urb already queued for processing
}
return 0;
}
/*-------------------------------------------------------------------*/
static int uhci_submit_control_urb (struct uhci_hcd *uhci, struct urb *urb)
{
uhci_desc_t *qh, *td;
urb_priv_t *urb_priv = urb->hcpriv;
unsigned long destination, status;
int maxsze = usb_maxpacket (urb->dev, urb->pipe, usb_pipeout (urb->pipe));
int depth_first=USE_CTRL_DEPTH_FIRST; // UHCI descriptor chasing method
unsigned long len;
char *data;
// err("uhci_submit_control start, buf %p", urb->transfer_buffer);
if (alloc_qh (uhci, &qh)) // alloc qh for this request
return -ENOMEM;
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH * depth_first)) // get td for setup stage
goto fail_unmap_enomem;
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
status = TD_CTRL_ACTIVE
| (urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD)
| (3 << 27); /* 3 errors */
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
/* Build the TD for the control request, try forever, 8 bytes of data */
fill_td (td, status, destination | (7 << 21), urb_priv->setup_packet_dma);
insert_td (uhci, qh, td, 0); // queue 'setup stage'-td in qh
#if 0
{
char *sp=urb->setup_packet;
dbg("SETUP to pipe %x: %x %x %x %x %x %x %x %x", urb->pipe,
sp[0],sp[1],sp[2],sp[3],sp[4],sp[5],sp[6],sp[7]);
}
//uhci_show_td(td);
#endif
len = urb->transfer_buffer_length;
data = urb->transfer_buffer;
/* If direction is "send", change the frame from SETUP (0x2D)
to OUT (0xE1). Else change it from SETUP to IN (0x69). */
destination = (urb->pipe & PIPE_DEVEP_MASK) | (usb_pipeout (urb->pipe)?USB_PID_OUT:USB_PID_IN);
while (len > 0) {
int pktsze = len;
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH * depth_first))
goto fail_unmap_enomem;
if (pktsze > maxsze)
pktsze = maxsze;
destination ^= 1 << TD_TOKEN_TOGGLE; // toggle DATA0/1
// Status, pktsze bytes of data
fill_td (td, status, destination | ((pktsze - 1) << 21),
urb_priv->transfer_buffer_dma + (data - (char *)urb->transfer_buffer));
insert_td (uhci, qh, td, UHCI_PTR_DEPTH * depth_first); // queue 'data stage'-td in qh
data += pktsze;
len -= pktsze;
}
/* Build the final TD for control status
It's only IN if the pipe is out AND we aren't expecting data */
destination &= ~UHCI_PID;
if (usb_pipeout (urb->pipe) || (urb->transfer_buffer_length == 0))
destination |= USB_PID_IN;
else
destination |= USB_PID_OUT;
destination |= 1 << TD_TOKEN_TOGGLE; /* End in Data1 */
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH))
goto fail_unmap_enomem;
status &=~TD_CTRL_SPD;
/* no limit on errors on final packet, 0 bytes of data */
fill_td (td, status | TD_CTRL_IOC, destination | (UHCI_NULL_DATA_SIZE << 21), 0);
insert_td (uhci, qh, td, UHCI_PTR_DEPTH * depth_first); // queue status td
list_add (&qh->desc_list, &urb_priv->desc_list);
queue_urb (uhci, urb); // queue _before_ inserting in desc chain
qh->hw.qh.element &= cpu_to_le32(~UHCI_PTR_TERM);
/* Start it up... put low speed first */
if (urb->dev->speed == USB_SPEED_LOW)
insert_qh (uhci, uhci->control_chain, qh, 0);
else
insert_qh (uhci, uhci->bulk_chain, qh, 0);
return 0;
fail_unmap_enomem:
delete_qh(uhci, qh);
return -ENOMEM;
}
/*-------------------------------------------------------------------*/
// For queued bulk transfers, two additional QH helpers are allocated (nqh, bqh)
// Due to the linking with other bulk urbs, it has to be locked with urb_list_lock!
static int uhci_submit_bulk_urb (struct uhci_hcd *uhci, struct urb *urb, struct urb *bulk_urb)
{
urb_priv_t *urb_priv = urb->hcpriv, *upriv, *bpriv=NULL;
uhci_desc_t *qh, *td, *nqh=NULL, *bqh=NULL, *first_td=NULL;
unsigned long destination, status;
char *data;
unsigned int pipe = urb->pipe;
int maxsze = usb_maxpacket (urb->dev, pipe, usb_pipeout (pipe));
int info, len, last;
int depth_first=USE_BULK_DEPTH_FIRST; // UHCI descriptor chasing method
if (usb_endpoint_halted (urb->dev, usb_pipeendpoint (pipe), usb_pipeout (pipe)))
return -EPIPE;
queue_dbg("uhci_submit_bulk_urb: urb %p, old %p, pipe %08x, len %i",
urb,bulk_urb,urb->pipe,urb->transfer_buffer_length);
upriv = (urb_priv_t*)urb->hcpriv;
if (!bulk_urb) {
if (alloc_qh (uhci, &qh)) // get qh for this request
return -ENOMEM;
if (urb->transfer_flags & USB_QUEUE_BULK) {
if (alloc_qh(uhci, &nqh)) // placeholder for clean unlink
goto fail_unmap_enomem;
upriv->next_qh = nqh;
queue_dbg("new next qh %p",nqh);
}
}
else {
bpriv = (urb_priv_t*)bulk_urb->hcpriv;
qh = bpriv->bottom_qh; // re-use bottom qh and next qh
nqh = bpriv->next_qh;
upriv->next_qh=nqh;
upriv->prev_queued_urb=bulk_urb;
}
if (urb->transfer_flags & USB_QUEUE_BULK) {
if (alloc_qh (uhci, &bqh)) // "bottom" QH
goto fail_unmap_enomem;
set_qh_element(bqh, UHCI_PTR_TERM);
set_qh_head(bqh, nqh->dma_addr | UHCI_PTR_QH); // element
upriv->bottom_qh = bqh;
}
queue_dbg("uhci_submit_bulk: qh %p bqh %p nqh %p",qh, bqh, nqh);
/* The "pipe" thing contains the destination in bits 8--18. */
destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid (pipe);
status = TD_CTRL_ACTIVE
| ((urb->transfer_flags & USB_DISABLE_SPD) ? 0 : TD_CTRL_SPD)
| (3 << 27); /* 3 errors */
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
/* Build the TDs for the bulk request */
len = urb->transfer_buffer_length;
data = urb->transfer_buffer;
do { // TBD: Really allow zero-length packets?
int pktsze = len;
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH * depth_first))
goto fail_unmap_enomem;
if (pktsze > maxsze)
pktsze = maxsze;
// pktsze bytes of data
info = destination | (((pktsze - 1)&UHCI_NULL_DATA_SIZE) << 21) |
(uhci_get_toggle (urb) << TD_TOKEN_TOGGLE);
fill_td (td, status, info,
urb_priv->transfer_buffer_dma + (data - (char *)urb->transfer_buffer));
data += pktsze;
len -= pktsze;
// Use USB_ZERO_PACKET to finish bulk OUTs always with a zero length packet
last = (len == 0 && (usb_pipein(pipe) || pktsze < maxsze || !(urb->transfer_flags & USB_ZERO_PACKET)));
if (last)
set_td_ioc(td); // last one generates INT
insert_td (uhci, qh, td, UHCI_PTR_DEPTH * depth_first);
if (!first_td)
first_td=td;
uhci_do_toggle (urb);
} while (!last);
if (bulk_urb && bpriv) // everything went OK, link with old bulk URB
bpriv->next_queued_urb=urb;
list_add (&qh->desc_list, &urb_priv->desc_list);
if (urb->transfer_flags & USB_QUEUE_BULK)
append_qh(uhci, td, bqh, UHCI_PTR_DEPTH * depth_first);
queue_urb_unlocked (uhci, urb);
if (urb->transfer_flags & USB_QUEUE_BULK)
set_qh_element(qh, first_td->dma_addr);
else
qh->hw.qh.element &= cpu_to_le32(~UHCI_PTR_TERM); // arm QH
if (!bulk_urb) { // new bulk queue
if (urb->transfer_flags & USB_QUEUE_BULK) {
spin_lock (&uhci->td_lock); // both QHs in one go
insert_qh (uhci, uhci->chain_end, qh, 0); // Main QH
insert_qh (uhci, uhci->chain_end, nqh, 0); // Helper QH
spin_unlock (&uhci->td_lock);
}
else
insert_qh (uhci, uhci->chain_end, qh, 0);
}
//dbg("uhci_submit_bulk_urb: exit\n");
return 0;
fail_unmap_enomem:
delete_qh(uhci, qh);
if (bqh)
delete_qh(uhci, bqh);
if (!bulk_urb && nqh)
delete_qh(uhci, nqh);
return -ENOMEM;
}
/*---------------------------------------------------------------------------*/
// submits USB interrupt (ie. polling ;-)
// ASAP-flag set implicitely
// if period==0, the transfer is only done once
static int uhci_submit_int_urb (struct uhci_hcd *uhci, struct urb *urb)
{
urb_priv_t *urb_priv = urb->hcpriv;
int nint, n;
uhci_desc_t *td;
int status, destination;
int info;
unsigned int pipe = urb->pipe;
if (urb->interval == 0)
nint = 0;
else { // round interval down to 2^n
for (nint = 0, n = 1; nint <= 8; nint++, n += n)
if (urb->interval < n) {
urb->interval = n / 2;
break;
}
nint--;
}
dbg("Rounded interval to %i, chain %i", urb->interval, nint);
// remember start frame, just in case...
urb->start_frame = UHCI_GET_CURRENT_FRAME (uhci) & 1023;
urb->number_of_packets = 1; // INT allows only one packet
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH))
return -ENOMEM;
status = TD_CTRL_ACTIVE | TD_CTRL_IOC
| (urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD)
| (3 << 27);
if (urb->dev->speed == USB_SPEED_LOW)
status |= TD_CTRL_LS;
destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid (pipe) |
(((urb->transfer_buffer_length - 1) & 0x7ff) << 21);
info = destination | (uhci_get_toggle (urb) << TD_TOKEN_TOGGLE);
fill_td (td, status, info, urb_priv->transfer_buffer_dma);
list_add_tail (&td->desc_list, &urb_priv->desc_list);
queue_urb (uhci, urb);
insert_td_horizontal (uhci, uhci->int_chain[nint], td); // store in INT-TDs
uhci_do_toggle (urb);
return 0;
}
/*###########################################################################*/
// ISOCHRONOUS TRANSFERS
/*###########################################################################*/
// In case of ASAP iso transfer, search the URB-list for already queued URBs
// for this EP and calculate the earliest start frame for the new
// URB (easy seamless URB continuation!)
static int find_iso_limits (struct uhci_hcd *uhci, struct urb *urb, unsigned int *start, unsigned int *end)
{
struct urb *u, *last_urb = NULL;
urb_priv_t *priv;
struct list_head *p;
int ret=-1;
unsigned long flags;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
p=uhci->urb_list.prev;
for (; p != &uhci->urb_list; p = p->prev) {
priv = list_entry (p, urb_priv_t, urb_list);
u = priv->urb;
// look for pending URBs with identical pipe handle
// works only because iso doesn't toggle the data bit!
if ((urb->pipe == u->pipe) && (urb->dev == u->dev) && (u->status == -EINPROGRESS)) {
if (!last_urb)
*start = u->start_frame;
last_urb = u;
}
}
if (last_urb) {
*end = (last_urb->start_frame + last_urb->number_of_packets) & 1023;
ret=0;
}
spin_unlock_irqrestore(&uhci->urb_list_lock, flags);
return ret;
}
/*-------------------------------------------------------------------*/
// adjust start_frame according to scheduling constraints (ASAP etc)
static int iso_find_start (struct uhci_hcd *uhci, struct urb *urb)
{
unsigned int now;
unsigned int start_limit = 0, stop_limit = 0, queued_size;
int limits;
now = UHCI_GET_CURRENT_FRAME (uhci) & 1023;
if ((unsigned) urb->number_of_packets > 900)
return -EFBIG;
limits = find_iso_limits (uhci, urb, &start_limit, &stop_limit);
queued_size = (stop_limit - start_limit) & 1023;
if (urb->transfer_flags & USB_ISO_ASAP) {
// first iso
if (limits) {
// 10ms setup should be enough //FIXME!
urb->start_frame = (now + 10) & 1023;
}
else {
urb->start_frame = stop_limit; // seamless linkage
if (((now - urb->start_frame) & 1023) <= (unsigned) urb->number_of_packets) {
info("iso_find_start: gap in seamless isochronous scheduling");
dbg("iso_find_start: now %u start_frame %u number_of_packets %u pipe 0x%08x",
now, urb->start_frame, urb->number_of_packets, urb->pipe);
urb->start_frame = (now + 5) & 1023; // 5ms setup should be enough
}
}
}
else {
urb->start_frame &= 1023;
if (((now - urb->start_frame) & 1023) < (unsigned) urb->number_of_packets) {
dbg("iso_find_start: now between start_frame and end");
return -EAGAIN;
}
}
/* check if either start_frame or start_frame+number_of_packets-1 lies between start_limit and stop_limit */
if (limits)
return 0;
if (((urb->start_frame - start_limit) & 1023) < queued_size ||
((urb->start_frame + urb->number_of_packets - 1 - start_limit) & 1023) < queued_size) {
dbg("iso_find_start: start_frame %u number_of_packets %u start_limit %u stop_limit %u",
urb->start_frame, urb->number_of_packets, start_limit, stop_limit);
return -EAGAIN;
}
return 0;
}
/*-------------------------------------------------------------------*/
static int uhci_submit_iso_urb (struct uhci_hcd *uhci, struct urb *urb, int mem_flags)
{
urb_priv_t *urb_priv = urb->hcpriv;
int n=0, i, ret, last=0;
uhci_desc_t *td, **tdm;
int status, destination;
unsigned long flags;
tdm = (uhci_desc_t **) kmalloc (urb->number_of_packets * sizeof (uhci_desc_t*), mem_flags);
if (!tdm)
return -ENOMEM;
memset(tdm, 0, urb->number_of_packets * sizeof (uhci_desc_t*));
// First try to get all TDs. Cause: Removing already inserted TDs can only be done
// racefree in three steps: unlink TDs, wait one frame, delete TDs.
// So, this solutions seems simpler...
for (n = 0; n < urb->number_of_packets; n++) {
dbg("n:%d urb->iso_frame_desc[n].length:%d", n, urb->iso_frame_desc[n].length);
if (!urb->iso_frame_desc[n].length)
continue; // allows ISO striping by setting length to zero in iso_descriptor
if (alloc_td (uhci, &td, UHCI_PTR_DEPTH)) {
ret = -ENOMEM;
goto fail_unmap_tds;
}
last=n;
tdm[n] = td;
}
__save_flags(flags);
__cli(); // Disable IRQs to schedule all ISO-TDs in time
ret = iso_find_start (uhci, urb); // adjusts urb->start_frame for later use
if (ret) {
__restore_flags(flags);
n = urb->number_of_packets;
goto fail_unmap_tds;
}
status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid (urb->pipe);
// Queue all allocated TDs
for (n = 0; n < urb->number_of_packets; n++) {
td = tdm[n];
if (!td)
continue;
if (n == last) {
status |= TD_CTRL_IOC;
queue_urb (uhci, urb);
}
fill_td (td, status, destination | (((urb->iso_frame_desc[n].length - 1) & 0x7ff) << 21),
urb_priv->transfer_buffer_dma + urb->iso_frame_desc[n].offset);
list_add_tail (&td->desc_list, &urb_priv->desc_list);
insert_td_horizontal (uhci, uhci->iso_td[(urb->start_frame + n) & 1023], td); // store in iso-tds
}
kfree (tdm);
dbg("ISO-INT# %i, start %i, now %i", urb->number_of_packets, urb->start_frame, UHCI_GET_CURRENT_FRAME (uhci) & 1023);
ret = 0;
__restore_flags(flags);
return ret;
// Cleanup allocated TDs
fail_unmap_tds:
dbg("ISO failed, free %i, ret %i",n,ret);
for (i = 0; i < n; i++)
if (tdm[i])
delete_desc(uhci, tdm[i]);
kfree (tdm);
return ret;
}
/*###########################################################################*/
// URB UNLINK PROCESSING
/*###########################################################################*/
static void uhci_clean_iso_step1(struct uhci_hcd *uhci, urb_priv_t *urb_priv)
{
struct list_head *p;
uhci_desc_t *td;
dbg("uhci_clean_iso_step1");
for (p = urb_priv->desc_list.next; p != &urb_priv->desc_list; p = p->next) {
td = list_entry (p, uhci_desc_t, desc_list);
unlink_td (uhci, td, 1);
}
}
/*-------------------------------------------------------------------*/
static void uhci_clean_iso_step2(struct uhci_hcd *uhci, urb_priv_t *urb_priv)
{
struct list_head *p;
uhci_desc_t *td;
int now=UHCI_GET_CURRENT_FRAME(uhci);
dbg("uhci_clean_iso_step2");
while ((p = urb_priv->desc_list.next) != &urb_priv->desc_list) {
td = list_entry (p, uhci_desc_t, desc_list);
list_del (p);
INIT_LIST_HEAD(&td->horizontal);
list_add_tail (&td->horizontal, &uhci->free_desc_td);
td->last_used=now;
}
}
/*-------------------------------------------------------------------*/
/* mode: CLEAN_TRANSFER_NO_DELETION: unlink but no deletion mark (step 1 of async_unlink)
CLEAN_TRANSFER_REGULAR: regular (unlink/delete-mark)
CLEAN_TRANSFER_DELETION_MARK: deletion mark for QH (step 2 of async_unlink)
looks a bit complicated because of all the bulk queueing goodies
*/
static void uhci_clean_transfer (struct uhci_hcd *uhci, struct urb *urb, uhci_desc_t *qh, int mode)
{
uhci_desc_t *bqh, *nqh, *prevqh, *prevtd;
urb_priv_t *priv=(urb_priv_t*)urb->hcpriv;
int now=UHCI_GET_CURRENT_FRAME(uhci);
bqh=priv->bottom_qh;
if (!priv->next_queued_urb) { // no more appended bulk queues
queue_dbg("uhci_clean_transfer: No more bulks for urb %p, qh %p, bqh %p, nqh %p",
urb, qh, bqh, priv->next_qh);
if (priv->prev_queued_urb && mode != CLEAN_TRANSFER_DELETION_MARK) { // qh not top of the queue
unsigned long flags;
urb_priv_t* ppriv=(urb_priv_t*)priv->prev_queued_urb->hcpriv;
spin_lock_irqsave (&uhci->qh_lock, flags);
prevqh = list_entry (ppriv->desc_list.next, uhci_desc_t, desc_list);
prevtd = list_entry (prevqh->vertical.prev, uhci_desc_t, vertical);
set_td_link(prevtd, priv->bottom_qh->dma_addr | UHCI_PTR_QH); // skip current qh
mb();
queue_dbg("uhci_clean_transfer: relink pqh %p, ptd %p",prevqh, prevtd);
spin_unlock_irqrestore (&uhci->qh_lock, flags);
ppriv->bottom_qh = priv->bottom_qh;
ppriv->next_queued_urb = NULL;
}
else { // queue is dead, qh is top of the queue
if (mode != CLEAN_TRANSFER_DELETION_MARK)
unlink_qh(uhci, qh); // remove qh from horizontal chain
if (bqh) { // remove remainings of bulk queue
nqh=priv->next_qh;
if (mode != CLEAN_TRANSFER_DELETION_MARK)
unlink_qh(uhci, nqh); // remove nqh from horizontal chain
if (mode != CLEAN_TRANSFER_NO_DELETION) { // add helper QHs to free desc list
nqh->last_used = bqh->last_used = now;
list_add_tail (&nqh->horizontal, &uhci->free_desc_qh);
list_add_tail (&bqh->horizontal, &uhci->free_desc_qh);
}
}
}
}
else { // there are queued urbs following
queue_dbg("uhci_clean_transfer: urb %p, prevurb %p, nexturb %p, qh %p, bqh %p, nqh %p",
urb, priv->prev_queued_urb, priv->next_queued_urb, qh, bqh, priv->next_qh);
if (mode != CLEAN_TRANSFER_DELETION_MARK) { // no work for cleanup at unlink-completion
struct urb *nurb;
unsigned long flags;
nurb = priv->next_queued_urb;
spin_lock_irqsave (&uhci->qh_lock, flags);
if (!priv->prev_queued_urb) { // top QH
prevqh = list_entry (qh->horizontal.prev, uhci_desc_t, horizontal);
set_qh_head(prevqh, bqh->dma_addr | UHCI_PTR_QH);
list_del (&qh->horizontal); // remove this qh from horizontal chain
list_add (&bqh->horizontal, &prevqh->horizontal); // insert next bqh in horizontal chain
}
else { // intermediate QH
urb_priv_t* ppriv=(urb_priv_t*)priv->prev_queued_urb->hcpriv;
urb_priv_t* npriv=(urb_priv_t*)nurb->hcpriv;
uhci_desc_t * bnqh;
bnqh = list_entry (npriv->desc_list.next, uhci_desc_t, desc_list);
ppriv->bottom_qh = bnqh;
ppriv->next_queued_urb = nurb;
prevqh = list_entry (ppriv->desc_list.next, uhci_desc_t, desc_list);
set_qh_head(prevqh, bqh->dma_addr | UHCI_PTR_QH);
}
mb();
((urb_priv_t*)nurb->hcpriv)->prev_queued_urb=priv->prev_queued_urb;
spin_unlock_irqrestore (&uhci->qh_lock, flags);
}
}
if (mode != CLEAN_TRANSFER_NO_DELETION) {
qh->last_used = now;
list_add_tail (&qh->horizontal, &uhci->free_desc_qh); // mark qh for later deletion/kfree
}
}
/*-------------------------------------------------------------------*/
// async unlink_urb completion/cleanup work
// has to be protected by urb_list_lock!
// features: if set in transfer_flags, the resulting status of the killed
// transaction is not overwritten
static void uhci_cleanup_unlink(struct uhci_hcd *uhci, int force)
{
struct list_head *q;
struct urb *urb;
urb_priv_t *urb_priv;
int type, now = UHCI_GET_CURRENT_FRAME(uhci);
q = uhci->urb_unlinked.next;
while (q != &uhci->urb_unlinked) {
urb_priv = list_entry (q, urb_priv_t, urb_list);
urb = urb_priv->urb;
q = urb_priv->urb_list.next;
if (force || ((urb_priv->started != ~0) && (urb_priv->started != now))) {
async_dbg("async cleanup %p",urb);
type=usb_pipetype (urb->pipe);
switch (type) { // process descriptors
case PIPE_CONTROL:
// usb_show_device(urb->dev);
process_transfer (uhci, urb, CLEAN_TRANSFER_DELETION_MARK); // don't unlink (already done)
// usb_show_device(urb->dev);
break;
case PIPE_BULK:
if (!uhci->avoid_bulk.counter)
process_transfer (uhci, urb, CLEAN_TRANSFER_DELETION_MARK); // don't unlink (already done)
else
continue;
break;
case PIPE_ISOCHRONOUS:
process_iso (uhci, urb, PROCESS_ISO_FORCE); // force, don't unlink
break;
case PIPE_INTERRUPT:
process_interrupt (uhci, urb, PROCESS_INT_REMOVE);
break;
}
list_del (&urb_priv->urb_list);
uhci_urb_dma_sync(uhci, urb, urb_priv);
// clean up descriptors for INT/ISO
// if (type==PIPE_ISOCHRONOUS || type==PIPE_INTERRUPT)
// uhci_clean_iso_step2(uhci, urb_priv);
uhci_free_priv(uhci, urb, urb_priv);
if (!(urb->transfer_flags & USB_TIMEOUT_KILLED))
urb->status = -ENOENT; // now the urb is really dead
spin_unlock(&uhci->urb_list_lock);
usb_hcd_giveback_urb(&uhci->hcd, urb);
spin_lock(&uhci->urb_list_lock);
}
}
}
/*-------------------------------------------------------------------*/
/* needs urb_list_lock!
mode: UNLINK_ASYNC_STORE_URB: unlink and move URB into unlinked list
UNLINK_ASYNC_DONT_STORE: unlink, don't move URB into unlinked list
*/
static int uhci_unlink_urb_async (struct uhci_hcd *uhci, struct urb *urb, int mode)
{
uhci_desc_t *qh;
urb_priv_t *urb_priv;
async_dbg("unlink_urb_async called %p",urb);
urb_priv = (urb_priv_t*)urb->hcpriv;
if (urb_priv==0) {
err("hc_priv for URB %p is zero!",urb);
return -EINVAL;
}
urb_priv->started = ~0; // mark
dequeue_urb (uhci, urb);
if (mode==UNLINK_ASYNC_STORE_URB)
list_add_tail (&urb_priv->urb_list, &uhci->urb_unlinked); // store urb
uhci_switch_timer_int(uhci);
uhci->unlink_urb_done = 1;
switch (usb_pipetype (urb->pipe)) {
case PIPE_INTERRUPT:
uhci_do_toggle (urb);
case PIPE_ISOCHRONOUS:
uhci_clean_iso_step1 (uhci, urb_priv);
break;
case PIPE_BULK:
case PIPE_CONTROL:
qh = list_entry (urb_priv->desc_list.next, uhci_desc_t, desc_list);
uhci_clean_transfer (uhci, urb, qh, CLEAN_TRANSFER_NO_DELETION);
break;
}
urb_priv->started = UHCI_GET_CURRENT_FRAME(uhci);
return 0; // completion will follow
}
/*-------------------------------------------------------------------*/
// kills an urb by unlinking descriptors and waiting for at least one frame
static int uhci_unlink_urb_sync (struct uhci_hcd *uhci, struct urb *urb)
{
uhci_desc_t *qh;
urb_priv_t *urb_priv;
unsigned long flags=0;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
// err("uhci_unlink_urb_sync %p, %i",urb,urb->status);
// move descriptors out the the running chains, dequeue urb
uhci_unlink_urb_async(uhci, urb, UNLINK_ASYNC_DONT_STORE);
urb_priv = urb->hcpriv;
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
// cleanup the rest
switch (usb_pipetype (urb->pipe)) {
case PIPE_INTERRUPT:
case PIPE_ISOCHRONOUS:
uhci_wait_ms(1);
uhci_clean_iso_step2(uhci, urb_priv);
break;
case PIPE_BULK:
case PIPE_CONTROL:
qh = list_entry (urb_priv->desc_list.next, uhci_desc_t, desc_list);
uhci_clean_transfer(uhci, urb, qh, CLEAN_TRANSFER_DELETION_MARK);
uhci_wait_ms(1);
}
urb->status = -ENOENT; // mark urb as killed
finish_urb(uhci,urb);
return 0;
}
/*-------------------------------------------------------------------*/
// unlink urbs for specific device or all devices
static void uhci_unlink_urbs(struct uhci_hcd *uhci, struct usb_device *usb_dev, int remove_all)
{
struct list_head *p;
struct list_head *p2;
struct urb *urb;
urb_priv_t *priv;
unsigned long flags;
spin_lock_irqsave (&uhci->urb_list_lock, flags);
p = uhci->urb_list.prev;
while (p != &uhci->urb_list) {
p2 = p;
p = p->prev;
priv = list_entry (p2, urb_priv_t, urb_list);
urb = priv->urb;
// err("unlink urb: %p, dev %p, ud %p", urb, usb_dev,urb->dev);
//urb->transfer_flags |=USB_ASYNC_UNLINK;
if (remove_all || (usb_dev == urb->dev)) {
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
err("forced removing of queued URB %p due to disconnect",urb);
uhci_urb_dequeue(&uhci->hcd, urb);
urb->dev = NULL; // avoid further processing of this URB
spin_lock_irqsave (&uhci->urb_list_lock, flags);
p = uhci->urb_list.prev;
}
}
spin_unlock_irqrestore (&uhci->urb_list_lock, flags);
}
/*-------------------------------------------------------------------*/
// Checks for URB timeout and removes bandwidth reclamation if URB idles too long
static void uhci_check_timeouts(struct uhci_hcd *uhci)
{
struct list_head *p,*p2;
struct urb *urb;
int type;
p = uhci->urb_list.prev;
while (p != &uhci->urb_list) {
urb_priv_t *hcpriv;
p2 = p;
p = p->prev;
hcpriv = list_entry (p2, urb_priv_t, urb_list);
urb = hcpriv->urb;
type = usb_pipetype (urb->pipe);
if ( urb->timeout && time_after(jiffies, hcpriv->started + urb->timeout)) {
urb->transfer_flags |= USB_TIMEOUT_KILLED | USB_ASYNC_UNLINK;
async_dbg("uhci_check_timeout: timeout for %p",urb);
uhci_unlink_urb_async(uhci, urb, UNLINK_ASYNC_STORE_URB);
}
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
else if (((type == PIPE_BULK) || (type == PIPE_CONTROL)) &&
(hcpriv->use_loop) && time_after(jiffies, hcpriv->started + IDLE_TIMEOUT))
disable_desc_loop(uhci, urb);
#endif
}
uhci->timeout_check=jiffies;
}
/*###########################################################################*/
// INTERRUPT PROCESSING ROUTINES
/*###########################################################################*/
/*
* Map status to standard result codes
*
* <status> is (td->status & 0xFE0000) [a.k.a. uhci_status_bits(td->status)
* <dir_out> is True for output TDs and False for input TDs.
*/
static int uhci_map_status (int status, int dir_out)
{
if (!status)
return 0;
if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
return -EPROTO;
if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
if (dir_out)
return -ETIMEDOUT;
else
return -EILSEQ;
}
if (status & TD_CTRL_NAK) /* NAK */
return -ETIMEDOUT;
if (status & TD_CTRL_BABBLE) /* Babble */
return -EOVERFLOW;
if (status & TD_CTRL_DBUFERR) /* Buffer error */
return -ENOSR;
if (status & TD_CTRL_STALLED) /* Stalled */
return -EPIPE;
if (status & TD_CTRL_ACTIVE) /* Active */
return 0;
return -EPROTO;
}
/*-------------------------------------------------------------------*/
static void correct_data_toggles(struct urb *urb)
{
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe),
!uhci_get_toggle (urb));
while(urb) {
urb_priv_t *priv=urb->hcpriv;
uhci_desc_t *qh = list_entry (priv->desc_list.next, uhci_desc_t, desc_list);
struct list_head *p = qh->vertical.next;
uhci_desc_t *td;
dbg("URB to correct %p\n", urb);
for (; p != &qh->vertical; p = p->next) {
td = list_entry (p, uhci_desc_t, vertical);
td->hw.td.info^=cpu_to_le32(1<<TD_TOKEN_TOGGLE);
}
urb=priv->next_queued_urb;
}
}
/*-------------------------------------------------------------------*/
/*
* For IN-control transfers, process_transfer gets a bit more complicated,
* since there are devices that return less data (eg. strings) than they
* have announced. This leads to a queue abort due to the short packet,
* the status stage is not executed. If this happens, the status stage
* is manually re-executed.
* mode: PROCESS_TRANSFER_REGULAR: regular (unlink QH)
* PROCESS_TRANSFER_DONT_UNLINK: QHs already unlinked (for async unlink_urb)
*/
static int process_transfer (struct uhci_hcd *uhci, struct urb *urb, int mode)
{
urb_priv_t *urb_priv = urb->hcpriv;
struct list_head *qhl = urb_priv->desc_list.next;
uhci_desc_t *qh = list_entry (qhl, uhci_desc_t, desc_list);
struct list_head *p = qh->vertical.next;
uhci_desc_t *desc= list_entry (urb_priv->desc_list.prev, uhci_desc_t, desc_list);
uhci_desc_t *last_desc = list_entry (desc->vertical.prev, uhci_desc_t, vertical);
int data_toggle = uhci_get_toggle (urb); // save initial data_toggle
int maxlength; // extracted and remapped info from TD
int actual_length;
int status = 0, ret = 0;
//dbg("process_transfer: urb %p, urb_priv %p, qh %p last_desc %p\n",urb,urb_priv, qh, last_desc);
/* if the status phase has been retriggered and the
queue is empty or the last status-TD is inactive, the retriggered
status stage is completed
*/
if (urb_priv->flags &&
((qh->hw.qh.element == cpu_to_le32(UHCI_PTR_TERM)) || !is_td_active(desc)))
goto transfer_finished;
urb->actual_length=0;
for (; p != &qh->vertical; p = p->next) {
desc = list_entry (p, uhci_desc_t, vertical);
if (is_td_active(desc)) { // do not process active TDs
if (mode == CLEAN_TRANSFER_DELETION_MARK) // if called from async_unlink
uhci_clean_transfer(uhci, urb, qh, CLEAN_TRANSFER_DELETION_MARK);
return ret;
}
actual_length = uhci_actual_length(desc); // extract transfer parameters from TD
maxlength = (((le32_to_cpu(desc->hw.td.info) >> 21) & 0x7ff) + 1) & 0x7ff;
status = uhci_map_status (uhci_status_bits (le32_to_cpu(desc->hw.td.status)), usb_pipeout (urb->pipe));
if (status == -EPIPE) { // see if EP is stalled
// set up stalled condition
usb_endpoint_halt (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe));
}
if (status && (status != -EPIPE) && (status != -EOVERFLOW)) {
// if any error occurred stop processing of further TDs
// only set ret if status returned an error
ret = status;
urb->error_count++;
break;
}
else if ((le32_to_cpu(desc->hw.td.info) & 0xff) != USB_PID_SETUP)
urb->actual_length += actual_length;
// got less data than requested
if ( (actual_length < maxlength)) {
if (urb->transfer_flags & USB_DISABLE_SPD) {
status = -EREMOTEIO; // treat as real error
dbg("process_transfer: SPD!!");
break; // exit after this TD because SP was detected
}
// short read during control-IN: re-start status stage
if ((usb_pipetype (urb->pipe) == PIPE_CONTROL)) {
if (uhci_packetid(le32_to_cpu(last_desc->hw.td.info)) == USB_PID_OUT) {
set_qh_element(qh, last_desc->dma_addr); // re-trigger status stage
dbg("short packet during control transfer, retrigger status stage @ %p",last_desc);
urb_priv->flags = 1; // mark as short control packet
return 0;
}
}
// all other cases: short read is OK
data_toggle = uhci_toggle (le32_to_cpu(desc->hw.td.info));
break;
}
else if (status) {
ret = status;
urb->error_count++;
break;
}
data_toggle = uhci_toggle (le32_to_cpu(desc->hw.td.info));
queue_dbg("process_transfer: len:%d status:%x mapped:%x toggle:%d",
actual_length, le32_to_cpu(desc->hw.td.status),status, data_toggle);
}
/* toggle correction for short bulk transfers (nonqueued/queued) */
if (usb_pipetype (urb->pipe) == PIPE_BULK ) {
urb_priv_t *priv=(urb_priv_t*)urb->hcpriv;
struct urb *next_queued_urb=priv->next_queued_urb;
if (next_queued_urb) {
urb_priv_t *next_priv=(urb_priv_t*)next_queued_urb->hcpriv;
uhci_desc_t *qh = list_entry (next_priv->desc_list.next, uhci_desc_t, desc_list);
uhci_desc_t *first_td=list_entry (qh->vertical.next, uhci_desc_t, vertical);
if (data_toggle == uhci_toggle (le32_to_cpu(first_td->hw.td.info))) {
err("process_transfer: fixed toggle");
correct_data_toggles(next_queued_urb);
}
}
else
usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe), !data_toggle);
}
transfer_finished:
uhci_clean_transfer(uhci, urb, qh, mode);
urb->status = status;
#ifdef CONFIG_USB_UHCI_HIGH_BANDWIDTH
disable_desc_loop(uhci,urb);
#endif
dbg("process_transfer: (end) urb %p, wanted len %d, len %d status %x err %d",
urb,urb->transfer_buffer_length,urb->actual_length, urb->status, urb->error_count);
return ret;
}
/*-------------------------------------------------------------------*/
static int process_interrupt (struct uhci_hcd *uhci, struct urb *urb, int mode)
{
urb_priv_t *urb_priv = urb->hcpriv;
struct list_head *p = urb_priv->desc_list.next;
uhci_desc_t *desc = list_entry (urb_priv->desc_list.prev, uhci_desc_t, desc_list);
int actual_length, status = 0, i, ret = -EINPROGRESS;
//dbg("urb contains interrupt request");
for (i = 0; p != &urb_priv->desc_list; p = p->next, i++) // Maybe we allow more than one TD later ;-)
{
desc = list_entry (p, uhci_desc_t, desc_list);
if (is_td_active(desc) || !(desc->hw.td.status & cpu_to_le32(TD_CTRL_IOC))) {
// do not process active TDs or one-shot TDs (->no recycling)
//dbg("TD ACT Status @%p %08x",desc,le32_to_cpu(desc->hw.td.status));
break;
}
// extract transfer parameters from TD
actual_length = uhci_actual_length(desc);
status = uhci_map_status (uhci_status_bits (le32_to_cpu(desc->hw.td.status)), usb_pipeout (urb->pipe));
// see if EP is stalled
if (status == -EPIPE) {
// set up stalled condition
usb_endpoint_halt (urb->dev, usb_pipeendpoint (urb->pipe), usb_pipeout (urb->pipe));
}
// if any error occurred: ignore this td, and continue
if (status != 0) {
//uhci_show_td (desc);
urb->error_count++;
goto recycle;
}
else
urb->actual_length = actual_length;
recycle:
uhci_urb_dma_sync(uhci, urb, urb->hcpriv);
if (urb->complete) {
//dbg("process_interrupt: calling completion, status %i",status);
urb->status = status;
((urb_priv_t*)urb->hcpriv)->flags=1; // if unlink_urb is called during completion
spin_unlock(&uhci->urb_list_lock);
urb->complete ((struct urb *) urb);
spin_lock(&uhci->urb_list_lock);
((urb_priv_t*)urb->hcpriv)->flags=0; // FIXME: unlink in completion not handled...
}
if ((urb->status != -ECONNABORTED) && (urb->status != ECONNRESET) &&
(urb->status != -ENOENT)) {
urb->status = -EINPROGRESS;
// Recycle INT-TD if interval!=0, else mark TD as one-shot
if (urb->interval) {
desc->hw.td.info &= cpu_to_le32(~(1 << TD_TOKEN_TOGGLE));
if (status==0) {
((urb_priv_t*)urb->hcpriv)->started=jiffies;
desc->hw.td.info |= cpu_to_le32((uhci_get_toggle (urb) << TD_TOKEN_TOGGLE));
uhci_do_toggle (urb);
} else {
desc->hw.td.info |= cpu_to_le32((!uhci_get_toggle (urb) << TD_TOKEN_TOGGLE));
}
desc->hw.td.status= cpu_to_le32(TD_CTRL_ACTIVE | TD_CTRL_IOC |
(urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD) | (3 << 27));
if (urb->dev->speed == USB_SPEED_LOW)
desc->hw.td.status |=
__constant_cpu_to_le32 (TD_CTRL_LS);
mb();
}
else {
uhci_unlink_urb_async(uhci, urb, UNLINK_ASYNC_STORE_URB);
uhci_do_toggle (urb); // correct toggle after unlink
clr_td_ioc(desc); // inactivate TD
}
}
if (mode == PROCESS_INT_REMOVE) {
INIT_LIST_HEAD(&desc->horizontal);
list_add_tail (&desc->horizontal, &uhci->free_desc_td);
desc->last_used=UHCI_GET_CURRENT_FRAME(uhci);
}
}
return ret;
}
/*-------------------------------------------------------------------*/
// mode: PROCESS_ISO_REGULAR: processing only for done TDs, unlink TDs
// mode: PROCESS_ISO_FORCE: force processing, don't unlink TDs (already unlinked)
static int process_iso (struct uhci_hcd *uhci, struct urb *urb, int mode)
{
urb_priv_t *urb_priv = urb->hcpriv;
struct list_head *p = urb_priv->desc_list.next, *p_tmp;
uhci_desc_t *desc = list_entry (urb_priv->desc_list.prev, uhci_desc_t, desc_list);
int i, ret = 0;
int now=UHCI_GET_CURRENT_FRAME(uhci);
dbg("urb contains iso request");
if (is_td_active(desc) && mode==PROCESS_ISO_REGULAR)
return -EXDEV; // last TD not finished
urb->error_count = 0;
urb->actual_length = 0;
urb->status = 0;
dbg("process iso urb %p, %li, %i, %i, %i %08x",urb,jiffies,UHCI_GET_CURRENT_FRAME(s),
urb->number_of_packets,mode,le32_to_cpu(desc->hw.td.status));
for (i = 0; p != &urb_priv->desc_list; i++) {
desc = list_entry (p, uhci_desc_t, desc_list);
//uhci_show_td(desc);
if (is_td_active(desc)) {
// means we have completed the last TD, but not the TDs before
desc->hw.td.status &= cpu_to_le32(~TD_CTRL_ACTIVE);
dbg("TD still active (%x)- grrr. paranoia!", le32_to_cpu(desc->hw.td.status));
ret = -EXDEV;
urb->iso_frame_desc[i].status = ret;
unlink_td (uhci, desc, 1);
goto err;
}
if (mode == PROCESS_ISO_REGULAR)
unlink_td (uhci, desc, 1);
if (urb->number_of_packets <= i) {
dbg("urb->number_of_packets (%d)<=(%d)", urb->number_of_packets, i);
ret = -EINVAL;
goto err;
}
urb->iso_frame_desc[i].actual_length = uhci_actual_length(desc);
urb->iso_frame_desc[i].status = uhci_map_status (uhci_status_bits (le32_to_cpu(desc->hw.td.status)), usb_pipeout (urb->pipe));
urb->actual_length += urb->iso_frame_desc[i].actual_length;
err:
if (urb->iso_frame_desc[i].status != 0) {
urb->error_count++;
urb->status = urb->iso_frame_desc[i].status;
}
dbg("process_iso: %i: len:%d %08x status:%x",
i, urb->iso_frame_desc[i].actual_length, le32_to_cpu(desc->hw.td.status),urb->iso_frame_desc[i].status);
p_tmp = p;
p = p->next;
list_del (p_tmp);
// delete_desc (uhci, desc);
// add to cool down pool
INIT_LIST_HEAD(&desc->horizontal);
list_add_tail (&desc->horizontal, &uhci->free_desc_td);
desc->last_used=now;
}
dbg("process_iso: exit %i (%d), actual_len %i", i, ret,urb->actual_length);
return ret;
}
/*-------------------------------------------------------------------*/
// called with urb_list_lock set
static int process_urb (struct uhci_hcd *uhci, struct list_head *p)
{
struct urb *urb, *urbt;
struct usb_device *usb_dev;
urb_priv_t *priv;
int type, n, ret = 0;
priv=list_entry (p, urb_priv_t, urb_list);
urb=priv->urb;
// dbg("process_urb p %p, udev %p",urb, urb->dev);
type=usb_pipetype (urb->pipe);
switch (type) {
case PIPE_CONTROL:
ret = process_transfer (uhci, urb, CLEAN_TRANSFER_REGULAR);
break;
case PIPE_BULK:
// if a submit is fiddling with bulk queues, ignore it for now
if (!uhci->avoid_bulk.counter)
ret = process_transfer (uhci, urb, CLEAN_TRANSFER_REGULAR);
else
return 0;
break;
case PIPE_ISOCHRONOUS:
ret = process_iso (uhci, urb, PROCESS_ISO_REGULAR);
break;
case PIPE_INTERRUPT:
ret = process_interrupt (uhci, urb, PROCESS_INT_REGULAR);
break;
}
if (urb->status != -EINPROGRESS) {
dequeue_urb (uhci, urb);
uhci_free_priv(uhci, urb, urb->hcpriv);
if (type != PIPE_INTERRUPT) { // process_interrupt does completion on its own
// FIXME: How to detect killed URBs in a ring?
if (type == PIPE_ISOCHRONOUS) {
for (n=0, urbt = urb->next; urbt && (urbt != urb) && (n<MAX_NEXT_COUNT); urbt = urbt->next, n++)
continue;
if (urbt && (n<MAX_NEXT_COUNT)) {
usb_dev=urb->dev;
urb->dev = NULL;
spin_unlock(&uhci->urb_list_lock);
if (urb->complete)
urb->complete (urb);
urb->dev=usb_dev;
uhci_urb_enqueue(&uhci->hcd, urb, GFP_ATOMIC); // FIXME memflags!
spin_lock(&uhci->urb_list_lock);
}
else {
spin_unlock(&uhci->urb_list_lock);
dbg("giveback iso urb %p, status %i, length %i\n",
urb, urb->status, urb->transfer_buffer_length);
usb_hcd_giveback_urb(&uhci->hcd, urb);
spin_lock(&uhci->urb_list_lock);
}
}
else {
spin_unlock(&uhci->urb_list_lock);
dbg("giveback urb %p, status %i, length %i\n",
urb, urb->status, urb->transfer_buffer_length);
usb_hcd_giveback_urb(&uhci->hcd, urb);
spin_lock(&uhci->urb_list_lock);
}
}
}
return ret;
}
/*###########################################################################*/
// EMERGENCY ROOM
/*###########################################################################*/
/* used to reanimate a halted hostcontroller which signals no interrupts anymore.
This is a shortcut for unloading and reloading the module, and should be only
used as the last resort, but some VIA chips need it.
*/
static int hc_defibrillate(struct uhci_hcd *uhci)
{
int ret;
err("Watchdog timeout, host controller obviously clinically dead, defibrillating...\n"
"Expect disconnections for all devices on this controller!");
uhci->running=0;
outw (USBCMD_HCRESET, (int)uhci->hcd.regs + USBCMD);
uhci_stop(&uhci->hcd);
ret=init_skel(uhci);
if (ret)
return -ENOMEM;
set_td_ioc(uhci->td128ms); // enable watchdog interrupt
hc_irq_run(uhci);
uhci->reanimations++;
err("Host controller restart done...");
return 0;
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7