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* Universal Host Controller Interface driver for USB.
*
* (C) Copyright 1999 Linus Torvalds
*
* Intel documents this fairly well, and as far as I know there
* are no royalties or anything like that, but even so there are
* people who decided that they want to do the same thing in a
* completely different way.
*
* Oh, well. The intel version is the more common by far. As such,
* that's the one I care about right now.
*
* WARNING! The USB documentation is downright evil. Most of it
* is just crap, written by a committee. You're better off ignoring
* most of it, the important stuff is:
* - the low-level protocol (fairly simple but lots of small details)
* - working around the horridness of the rest
*/
/* 4/4/1999 added data toggle for interrupt pipes -keryan */
/* 5/16/1999 added global toggles for bulk and control */
#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/malloc.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/spinlock.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include "uhci.h"
#ifdef CONFIG_APM
#include <linux/apm_bios.h>
static int handle_apm_event(apm_event_t event);
static int apm_resume = 0;
#endif
static int uhci_debug = 1;
#define compile_assert(x) do { switch (0) { case 1: case !(x): } } while (0)
static DECLARE_WAIT_QUEUE_HEAD(uhci_configure);
/*
* Map status to standard result codes
*/
static int uhci_map_status(int status, int dir_out)
{
if (!status)
return USB_ST_NOERROR;
if (status & 0x02) /* Bitstuff error*/
return USB_ST_BITSTUFF;
if (status & 0x04) { /* CRC/Timeout */
if (dir_out)
return USB_ST_TIMEOUT;
else
return USB_ST_CRC;
}
if (status & 0x08) /* NAK */
return USB_ST_TIMEOUT;
if (status & 0x10) /* Babble */
return USB_ST_STALL;
if (status & 0x20) /* Buffer error */
return USB_ST_BUFFERUNDERRUN;
if (status & 0x40) /* Stalled */
return USB_ST_STALL;
if (status & 0x80) /* Active */
return USB_ST_NOERROR;
return USB_ST_INTERNALERROR;
}
/*
* Return the result of a TD..
*/
static int uhci_td_result(struct uhci_device *dev, struct uhci_td *td, unsigned long *rval)
{
unsigned int status;
struct uhci_td *tmp = td->first;
if(rval)
*rval = 0;
/* locate the first failing td, if any */
do {
status = (tmp->status >> 16) & 0xff;
if (status) {
/* must reset the toggle on first error */
if (uhci_debug) {
printk("Set toggle from %x rval %d\n", (unsigned int)tmp, rval ? *rval : 0);
}
usb_settoggle(dev->usb, usb_pipeendpoint(tmp->info), (tmp->info >> 19) & 1);
break;
} else {
if(rval)
*rval += (tmp->status & 0x3ff) + 1;
}
if ((tmp->link & 1) || (tmp->link & 2))
break;
tmp = bus_to_virt(tmp->link & ~0xF);
} while (1);
if (!status)
return USB_ST_NOERROR;
/* Some debugging code */
if (uhci_debug /* && (!usb_pipeendpoint(tmp->info) || !(status & 0x08))*/ ) {
int i = 10;
tmp = td->first;
printk("uhci_td_result() failed with status %x\n", status);
//show_status(dev->uhci);
do {
show_td(tmp);
if ((tmp->link & 1) || (tmp->link & 2))
break;
tmp = bus_to_virt(tmp->link & ~0xF);
if (!--i)
break;
} while (1);
}
if (status & 0x40) {
/* endpoint has stalled - mark it halted */
usb_endpoint_halt(dev->usb, usb_pipeendpoint(tmp->info));
return USB_ST_STALL;
}
if (status == 0x80) {
/* still active */
if (!rval)
return USB_ST_DATAUNDERRUN;
}
return uhci_map_status(status, usb_pipeout(tmp->info));
}
/*
* Inserts a td into qh list at the top.
*
* Careful about atomicity: even on UP this
* requires a locked access due to the concurrent
* DMA engine.
*
* NOTE! This assumes that first->last is a valid
* list of TD's with the proper backpointers set
* up and all..
*/
static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct uhci_td *first, struct uhci_td *last)
{
unsigned int link = qh->element;
unsigned int new = 4 | virt_to_bus(first);
for (;;) {
unsigned char success;
last->link = link;
first->backptr = &qh->element;
asm volatile("lock ; cmpxchg %4,%2 ; sete %0"
:"=q" (success), "=a" (link)
:"m" (qh->element), "1" (link), "r" (new)
:"memory");
if (success) {
/* Was there a successor entry? Fix it's backpointer.. */
if ((link & 1) == 0) {
struct uhci_td *next = bus_to_virt(link & ~15);
next->backptr = &last->link;
}
break;
}
}
}
static inline void uhci_insert_td_in_qh(struct uhci_qh *qh, struct uhci_td *td)
{
uhci_insert_tds_in_qh(qh, td, td);
}
static void uhci_insert_qh(struct uhci_qh *qh, struct uhci_qh *newqh)
{
newqh->link = qh->link;
qh->link = virt_to_bus(newqh) | 2;
}
static void uhci_remove_qh(struct uhci_qh *qh, struct uhci_qh *remqh)
{
unsigned int remphys = virt_to_bus(remqh);
struct uhci_qh *lqh = qh;
while ((lqh->link & ~0xF) != remphys) {
if (lqh->link & 1)
break;
lqh = bus_to_virt(lqh->link & ~0xF);
}
if (lqh->link & 1) {
printk("couldn't find qh in chain!\n");
return;
}
lqh->link = remqh->link;
}
/*
* Removes td from qh if present.
*
* NOTE! We keep track of both forward and back-pointers,
* so this should be trivial, right?
*
* Wrong. While all TD insert/remove operations are synchronous
* on the CPU, the UHCI controller can (and does) play with the
* very first forward pointer. So we need to validate the backptr
* before we change it, so that we don't by mistake reset the QH
* head to something old.
*/
static void uhci_remove_td(struct uhci_td *td)
{
unsigned int *backptr = td->backptr;
unsigned int link = td->link;
unsigned int me;
if (!backptr)
return;
td->backptr = NULL;
/*
* This is the easy case: the UHCI will never change "td->link",
* so we can always just look at that and fix up the backpointer
* of any next element..
*/
if (!(link & 1)) {
struct uhci_td *next = bus_to_virt(link & ~15);
next->backptr = backptr;
}
/*
* The nasty case is "backptr->next", which we need to
* update to "link" _only_ if "backptr" still points
* to us (it may not: maybe backptr is a QH->element
* pointer and the UHCI has changed the value).
*/
me = virt_to_bus(td) | (0xe & *backptr);
asm volatile("lock ; cmpxchg %0,%1"
:
:"r" (link), "m" (*backptr), "a" (me)
:"memory");
}
static struct uhci_qh *uhci_qh_allocate(struct uhci_device *dev)
{
struct uhci_qh *qh;
int inuse;
qh = dev->qh;
for (; (inuse = test_and_set_bit(0, &qh->inuse)) != 0 && qh < &dev->qh[UHCI_MAXQH]; qh++)
;
if (!inuse)
return(qh);
printk("ran out of qh's for dev %p\n", dev);
return(NULL);
}
static void uhci_qh_deallocate(struct uhci_qh *qh)
{
// if (qh->element != 1)
// printk("qh %p leaving dangling entries? (%X)\n", qh, qh->element);
qh->element = 1;
qh->link = 1;
clear_bit(0, &qh->inuse);
}
static struct uhci_td *uhci_td_allocate(struct uhci_device *dev)
{
struct uhci_td *td;
int inuse;
td = dev->td;
for (; (inuse = test_and_set_bit(0, &td->inuse)) != 0 && td < &dev->td[UHCI_MAXTD]; td++)
;
if (!inuse) {
td->inuse = 1;
return(td);
}
printk("ran out of td's for dev %p\n", dev);
return(NULL);
}
/*
* This MUST only be called when it has been removed from a QH already (or
* the QH has been removed from the skeleton
*/
static void uhci_td_deallocate(struct uhci_td *td)
{
td->link = 1;
clear_bit(0, &td->inuse);
}
/*
* UHCI interrupt list operations..
*/
static spinlock_t irqlist_lock = SPIN_LOCK_UNLOCKED;
static void uhci_add_irq_list(struct uhci *uhci, struct uhci_td *td, usb_device_irq completed, void *dev_id)
{
unsigned long flags;
td->completed = completed;
td->dev_id = dev_id;
spin_lock_irqsave(&irqlist_lock, flags);
list_add(&td->irq_list, &uhci->interrupt_list);
spin_unlock_irqrestore(&irqlist_lock, flags);
}
static void uhci_remove_irq_list(struct uhci_td *td)
{
unsigned long flags;
spin_lock_irqsave(&irqlist_lock, flags);
list_del(&td->irq_list);
spin_unlock_irqrestore(&irqlist_lock, flags);
}
/*
* Request a interrupt handler..
*/
static int uhci_request_irq(struct usb_device *usb_dev, unsigned int pipe, usb_device_irq handler, int period, void *dev_id)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_device *root_hub=usb_to_uhci(dev->uhci->bus->root_hub);
struct uhci_td *td = uhci_td_allocate(dev);
struct uhci_qh *interrupt_qh = uhci_qh_allocate(dev);
unsigned int destination, status;
/* Destination: pipe destination with INPUT */
destination = (pipe & 0x0007ff00) | 0x69;
/* Status: slow/fast, Interrupt, Active, Short Packet Detect Infinite Errors */
status = (pipe & (1 << 26)) | (1 << 24) | (1 << 23) | (1 << 29) | (0 << 27);
if(interrupt_qh->element != 1)
printk("interrupt_qh->element = 0x%x\n",
interrupt_qh->element);
td->link = 1;
td->status = status; /* In */
td->info = destination | (7 << 21) | (usb_gettoggle(usb_dev, usb_pipeendpoint(pipe)) << 19); /* 8 bytes of data */
td->buffer = virt_to_bus(dev->data);
td->first = td;
td->qh = interrupt_qh;
td->dev = usb_dev;
/* if period 0, insert into fast q */
if (period == 0) {
td->inuse |= 2;
interrupt_qh->skel = &root_hub->skel_int2_qh;
} else
interrupt_qh->skel = &root_hub->skel_int8_qh;
uhci_add_irq_list(dev->uhci, td, handler, dev_id);
uhci_insert_td_in_qh(interrupt_qh, td);
/* Add it into the skeleton */
uhci_insert_qh(interrupt_qh->skel, interrupt_qh);
return 0;
}
/*
* Remove running irq td from queues
*/
static int uhci_remove_irq(struct usb_device *usb_dev, unsigned int pipe, usb_device_irq handler, int period, void *dev_id)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_device *root_hub=usb_to_uhci(dev->uhci->bus->root_hub);
struct uhci_td *td;
struct uhci_qh *interrupt_qh;
unsigned long flags;
struct list_head *head = &dev->uhci->interrupt_list;
struct list_head *tmp;
spin_lock_irqsave(&irqlist_lock, flags);
/* find the TD in the interrupt list */
tmp = head->next;
while (tmp != head) {
td = list_entry(tmp, struct uhci_td, irq_list);
if (td->dev_id == dev_id && td->completed == handler) {
/* found the right one - let's remove it */
/* notify removal */
td->completed(USB_ST_REMOVED, NULL, 0, td->dev_id);
/* this is DANGEROUS - not sure whether this is right */
list_del(&td->irq_list);
uhci_remove_td(td);
interrupt_qh = td->qh;
uhci_remove_qh(interrupt_qh->skel, interrupt_qh);
uhci_td_deallocate(td);
uhci_qh_deallocate(interrupt_qh);
spin_unlock_irqrestore(&irqlist_lock, flags);
return USB_ST_NOERROR;
}
}
spin_unlock_irqrestore(&irqlist_lock, flags);
return USB_ST_INTERNALERROR;
}
/*
* Isochronous thread operations
*/
int uhci_compress_isochronous(struct usb_device *usb_dev, void *_isodesc)
{
struct uhci_iso_td *isodesc = (struct uhci_iso_td *)_isodesc;
char *data = isodesc->data;
int i, totlen = 0;
for (i = 0; i < isodesc->num; i++) {
char *cdata = bus_to_virt(isodesc->td[i].buffer & ~0xF);
int n = (isodesc->td[i].status + 1) & 0x7FF;
if ((cdata != data) && (n))
memmove(data, cdata, n);
#if 0
if (n && n != 960)
printk("underrun: %d %d\n", i, n);
#endif
if ((isodesc->td[i].status >> 16) & 0xFF)
printk("error: %d %X\n", i, (isodesc->td[i].status >> 16));
data += n;
totlen += n;
}
return totlen;
}
int uhci_unsched_isochronous(struct usb_device *usb_dev, void *_isodesc)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci *uhci = dev->uhci;
struct uhci_iso_td *isodesc = (struct uhci_iso_td *)_isodesc;
int i;
if ((isodesc->frame < 0) || (isodesc->frame > 1023))
return 1;
/* Remove from previous frames */
for (i = 0; i < isodesc->num; i++) {
/* Turn off Active and IOC bits */
isodesc->td[i].status &= ~(3 << 23);
uhci->fl->frame[(isodesc->frame + i) % 1024] = isodesc->td[i].link;
}
isodesc->frame = -1;
return 0;
}
/* td points to the one td we allocated for isochronous transfers */
int uhci_sched_isochronous(struct usb_device *usb_dev, void *_isodesc, void *_pisodesc)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci *uhci = dev->uhci;
struct uhci_iso_td *isodesc = (struct uhci_iso_td *)_isodesc;
struct uhci_iso_td *pisodesc = (struct uhci_iso_td *)_pisodesc;
int frame, i;
if (isodesc->frame != -1) {
printk("isoc queue not removed\n");
uhci_unsched_isochronous(usb_dev, isodesc);
}
/* Insert TD into list */
if (!pisodesc) {
frame = inw(uhci->io_addr + USBFRNUM) % 1024;
/* HACK: Start 2 frames from now */
frame = (frame + 2) % 1024;
} else
frame = (pisodesc->endframe + 1) % 1024;
#if 0
printk("scheduling first at frame %d\n", frame);
#endif
for (i = 0; i < isodesc->num; i++) {
/* Active */
isodesc->td[i].status |= (1 << 23);
isodesc->td[i].backptr = &uhci->fl->frame[(frame + i) % 1024];
isodesc->td[i].link = uhci->fl->frame[(frame + i) % 1024];
uhci->fl->frame[(frame + i) % 1024] = virt_to_bus(&isodesc->td[i]);
}
#if 0
printk("last at frame %d\n", (frame + i - 1) % 1024);
#endif
/* Interrupt */
isodesc->td[i - 1].status |= (1 << 24);
isodesc->frame = frame;
isodesc->endframe = (frame + isodesc->num - 1) % 1024;
#if 0
return uhci_td_result(dev, td[num - 1]);
#endif
return 0;
}
/*
* Initialize isochronous queue
*/
void *uhci_alloc_isochronous(struct usb_device *usb_dev, unsigned int pipe, void *data, int len, int maxsze, usb_device_irq completed, void *dev_id)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
unsigned long destination, status;
struct uhci_td *td;
struct uhci_iso_td *isodesc;
int i;
isodesc = kmalloc(sizeof(*isodesc), GFP_KERNEL);
if (!isodesc) {
printk("Couldn't allocate isodesc!\n");
return NULL;
}
memset(isodesc, 0, sizeof(*isodesc));
/* Carefully work around the non contiguous pages */
isodesc->num = (len / PAGE_SIZE) * (PAGE_SIZE / maxsze);
isodesc->td = kmalloc(sizeof(struct uhci_td) * isodesc->num, GFP_KERNEL);
isodesc->frame = isodesc->endframe = -1;
isodesc->data = data;
isodesc->maxsze = maxsze;
if (!isodesc->td) {
printk("Couldn't allocate td's\n");
kfree(isodesc);
return NULL;
}
isodesc->frame = isodesc->endframe = -1;
/*
* Build the DATA TD's
*/
i = 0;
do {
/* Build the TD for control status */
td = &isodesc->td[i];
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (pipe & 0x0007ff00);
if (usb_pipeout(pipe))
destination |= 0xE1; /* OUT */
else
destination |= 0x69; /* IN */
/* Status: slow/fast, Active, Isochronous */
status = (pipe & (1 << 26)) | (1 << 23) | (1 << 25);
/*
* Build the TD for the control request
*/
td->status = status;
td->info = destination | ((maxsze - 1) << 21);
td->buffer = virt_to_bus(data);
td->first = td;
td->backptr = NULL;
i++;
data += maxsze;
if (((int)data % PAGE_SIZE) + maxsze >= PAGE_SIZE)
data = (char *)(((int)data + maxsze) & ~(PAGE_SIZE - 1));
len -= maxsze;
} while (i < isodesc->num);
/* IOC on the last TD */
td->status |= (1 << 24);
uhci_add_irq_list(dev->uhci, td, completed, dev_id);
return isodesc;
}
void uhci_delete_isochronous(struct usb_device *usb_dev, void *_isodesc)
{
struct uhci_iso_td *isodesc = (struct uhci_iso_td *)_isodesc;
/* If it's still scheduled, unschedule them */
if (isodesc->frame)
uhci_unsched_isochronous(usb_dev, isodesc);
/* Remove it from the IRQ list */
uhci_remove_irq_list(&isodesc->td[isodesc->num - 1]);
kfree(isodesc->td);
kfree(isodesc);
}
/*
* Control thread operations: we just mark the last TD
* in a control thread as an interrupt TD, and wake up
* the front-end on completion.
*
* We need to remove the TD from the lists (both interrupt
* list and TD lists) by hand if something bad happens!
*/
static DECLARE_WAIT_QUEUE_HEAD(control_wakeup);
static int uhci_control_completed(int status, void *buffer, int len, void *dev_id)
{
wake_up(&control_wakeup);
return 0; /* Don't re-instate */
}
/* td points to the last td in the list, which interrupts on completion */
static int uhci_run_control(struct uhci_device *dev, struct uhci_td *first, struct uhci_td *last)
{
DECLARE_WAITQUEUE(wait, current);
struct uhci_qh *ctrl_qh = uhci_qh_allocate(dev);
struct uhci_td *curtd;
struct uhci_device *root_hub=usb_to_uhci(dev->uhci->bus->root_hub);
current->state = TASK_UNINTERRUPTIBLE;
add_wait_queue(&control_wakeup, &wait);
uhci_add_irq_list(dev->uhci, last, uhci_control_completed, NULL);
/* FIXME: This is kinda kludged */
/* Walk the TD list and update the QH pointer */
{
int maxcount = 100;
curtd = first;
do {
curtd->qh = ctrl_qh;
if (curtd->link & 1)
break;
curtd = bus_to_virt(curtd->link & ~0xF);
if (!--maxcount) {
printk("runaway tds!\n");
break;
}
} while (1);
}
uhci_insert_tds_in_qh(ctrl_qh, first, last);
/* Add it into the skeleton */
uhci_insert_qh(&root_hub->skel_control_qh, ctrl_qh);
// control should be full here...
// printk("control\n");
// show_status(dev->uhci);
// show_queues(dev->uhci);
schedule_timeout(HZ*5);
// control should be empty here...
// show_status(dev->uhci);
// show_queues(dev->uhci);
remove_wait_queue(&control_wakeup, &wait);
/* Clean up in case it failed.. */
uhci_remove_irq_list(last);
#if 0
printk("Looking for tds [%p, %p]\n", dev->control_td, td);
#endif
/* Remove it from the skeleton */
uhci_remove_qh(&root_hub->skel_control_qh, ctrl_qh);
uhci_qh_deallocate(ctrl_qh);
return uhci_td_result(dev, last, NULL);
}
/*
* Send or receive a control message on a pipe.
*
* Note that the "pipe" structure is set up to map
* easily to the uhci destination fields.
*
* A control message is built up from three parts:
* - The command itself
* - [ optional ] data phase
* - Status complete phase
*
* The data phase can be an arbitrary number of TD's
* although we currently had better not have more than
* 29 TD's here (we have 31 TD's allocated for control
* operations, and two of them are used for command and
* status).
*
* 29 TD's is a minimum of 232 bytes worth of control
* information, that's just ridiculously high. Most
* control messages have just a few bytes of data.
*/
static int uhci_control_msg(struct usb_device *usb_dev, unsigned int pipe, void *cmd, void *data, int len)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_td *first, *td, *prevtd;
unsigned long destination, status;
int ret;
int maxsze = usb_maxpacket(usb_dev, pipe);
if (len > maxsze * 29)
printk("Warning, too much data for a control packet, crashing\n");
first = td = uhci_td_allocate(dev);
/* The "pipe" thing contains the destination in bits 8--18, 0x2D is SETUP */
destination = (pipe & 0x0007ff00) | 0x2D;
/* Status: slow/fast, Active, Short Packet Detect Three Errors */
status = (pipe & (1 << 26)) | (1 << 23) | (1 << 29) | (3 << 27);
/*
* Build the TD for the control request
*/
td->status = status; /* Try forever */
td->info = destination | (7 << 21); /* 8 bytes of data */
td->buffer = virt_to_bus(cmd);
td->first = td;
/*
* If direction is "send", change the frame from SETUP (0x2D)
* to OUT (0xE1). Else change it from SETUP to IN (0x69)
*/
destination ^= (0x2D ^ 0x69); /* SETUP -> IN */
if (usb_pipeout(pipe))
destination ^= (0xE1 ^ 0x69); /* IN -> OUT */
prevtd = td;
td = uhci_td_allocate(dev);
prevtd->link = 4 | virt_to_bus(td);
/*
* Build the DATA TD's
*/
while (len > 0) {
/* Build the TD for control status */
int pktsze = len;
if (pktsze > maxsze)
pktsze = maxsze;
/* Alternate Data0/1 (start with Data1) */
destination ^= 1 << 19;
td->status = status; /* Status */
td->info = destination | ((pktsze-1) << 21); /* pktsze bytes of data */
td->buffer = virt_to_bus(data);
td->first = first;
td->backptr = &prevtd->link;
data += pktsze;
len -= pktsze;
prevtd = td;
td = uhci_td_allocate(dev);
prevtd->link = 4 | virt_to_bus(td); /* Update previous TD */
}
/*
* Build the final TD for control status
*/
destination ^= (0xE1 ^ 0x69); /* OUT -> IN */
destination |= 1 << 19; /* End in Data1 */
td->backptr = &prevtd->link;
td->status = (status /* & ~(3 << 27) */) | (1 << 24); /* no limit on final packet */
td->info = destination | (0x7ff << 21); /* 0 bytes of data */
td->buffer = 0;
td->first = first;
td->link = 1; /* Terminate */
/* Start it up.. */
ret = uhci_run_control(dev, first, td);
{
int maxcount = 100;
struct uhci_td *curtd = first;
unsigned int nextlink;
do {
nextlink = curtd->link;
uhci_remove_td(curtd);
uhci_td_deallocate(curtd);
if (nextlink & 1) /* Tail? */
break;
curtd = bus_to_virt(nextlink & ~0xF);
if (!--maxcount) {
printk("runaway td's!?\n");
break;
}
} while (1);
}
if (uhci_debug && ret) {
__u8 *p = cmd;
printk("Failed cmd - %02X %02X %02X %02X %02X %02X %02X %02X\n",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
}
return ret;
}
/*
* Bulk thread operations: we just mark the last TD
* in a bulk thread as an interrupt TD, and wake up
* the front-end on completion.
*
* We need to remove the TD from the lists (both interrupt
* list and TD lists) by hand if something bad happens!
*/
static DECLARE_WAIT_QUEUE_HEAD(bulk_wakeup);
static int uhci_bulk_completed(int status, void *buffer, int len, void *dev_id)
{
wake_up(&bulk_wakeup);
return 0; /* Don't re-instate */
}
/* td points to the last td in the list, which interrupts on completion */
static int uhci_run_bulk(struct uhci_device *dev, struct uhci_td *first, struct uhci_td *last, unsigned long *rval)
{
DECLARE_WAITQUEUE(wait, current);
struct uhci_qh *bulk_qh = uhci_qh_allocate(dev);
struct uhci_td *curtd;
struct uhci_device *root_hub=usb_to_uhci(dev->uhci->bus->root_hub);
current->state = TASK_UNINTERRUPTIBLE;
add_wait_queue(&bulk_wakeup, &wait);
uhci_add_irq_list(dev->uhci, last, uhci_bulk_completed, NULL);
/* FIXME: This is kinda kludged */
/* Walk the TD list and update the QH pointer */
{
int maxcount = 100;
curtd = first;
do {
curtd->qh = bulk_qh;
if (curtd->link & 1)
break;
curtd = bus_to_virt(curtd->link & ~0xF);
if (!--maxcount) {
printk("runaway tds!\n");
break;
}
} while (1);
}
uhci_insert_tds_in_qh(bulk_qh, first, last);
/* Add it into the skeleton */
uhci_insert_qh(&root_hub->skel_bulk0_qh, bulk_qh);
// now we're in the queue... but don't ask WHAT is in there ;-(
// printk("bulk\n");
// show_status(dev->uhci);
// show_queues(dev->uhci);
schedule_timeout(HZ*5);
// show_status(dev->uhci);
// show_queues(dev->uhci);
//show_queue(first->qh);
remove_wait_queue(&bulk_wakeup, &wait);
/* Clean up in case it failed.. */
uhci_remove_irq_list(last);
#if 0
printk("Looking for tds [%p, %p]\n", dev->control_td, td);
#endif
/* Remove it from the skeleton */
uhci_remove_qh(&root_hub->skel_bulk0_qh, bulk_qh);
uhci_qh_deallocate(bulk_qh);
return uhci_td_result(dev, last, rval);
}
/*
* Send or receive a bulk message on a pipe.
*
* Note that the "pipe" structure is set up to map
* easily to the uhci destination fields.
*
* A bulk message is only built up from
* the data phase
*
* The data phase can be an arbitrary number of TD's
* although we currently had better not have more than
* 31 TD's here.
*
* 31 TD's is a minimum of 248 bytes worth of bulk
* information.
*/
static int uhci_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, void *data, int len, unsigned long *rval)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_td *first, *td, *prevtd;
unsigned long destination, status;
int ret;
int maxsze = usb_maxpacket(usb_dev, pipe);
if (usb_endpoint_halted(usb_dev, usb_pipeendpoint(pipe)) &&
usb_clear_halt(usb_dev, usb_pipeendpoint(pipe) | (pipe & 0x80)))
return USB_ST_STALL;
if (len > maxsze * 31)
printk("Warning, too much data for a bulk packet, crashing (%d/%d)\n", len, maxsze);
/* The "pipe" thing contains the destination in bits 8--18, 0x69 is IN */
/*
IS THIS NECCESARY? PERHAPS WE CAN JUST USE THE PIPE
LOOK AT: usb_pipeout and the pipe bits
I FORGOT WHAT IT EXACTLY DOES
*/
if (usb_pipeout(pipe)) {
destination = (pipe & 0x0007ff00) | 0xE1;
}
else {
destination = (pipe & 0x0007ff00) | 0x69;
}
/* Status: slow/fast, Active, Short Packet Detect Three Errors */
status = (pipe & (1 << 26)) | (1 << 23) | (1 << 29) | (3 << 27);
/*
* Build the TDs for the bulk request
*/
first = td = uhci_td_allocate(dev);
prevtd = first; //This is fake, but at least it's not NULL
while (len > 0) {
/* Build the TD for control status */
int pktsze = len;
if (pktsze > maxsze)
pktsze = maxsze;
td->status = status; /* Status */
td->info = destination | ((pktsze-1) << 21) |
(usb_gettoggle(usb_dev, usb_pipeendpoint(pipe)) << 19); /* pktsze bytes of data */
td->buffer = virt_to_bus(data);
td->backptr = &prevtd->link;
td->first = first;
data += maxsze;
len -= maxsze;
if (len > 0) {
prevtd = td;
td = uhci_td_allocate(dev);
prevtd->link = 4 | virt_to_bus(td); /* Update previous TD */
}
/* Alternate Data0/1 (start with Data0) */
usb_dotoggle(usb_dev, usb_pipeendpoint(pipe));
}
td->link = 1; /* Terminate */
td->status |= (1 << 24); /* IOC */
/* CHANGE DIRECTION HERE! SAVE IT SOMEWHERE IN THE ENDPOINT!!! */
/* Start it up.. */
ret = uhci_run_bulk(dev, first, td, rval);
{
int maxcount = 100;
struct uhci_td *curtd = first;
unsigned int nextlink;
do {
nextlink = curtd->link;
uhci_remove_td(curtd);
uhci_td_deallocate(curtd);
if (nextlink & 1) /* Tail? */
break;
curtd = bus_to_virt(nextlink & ~0xF);
if (!--maxcount) {
printk("runaway td's!?\n");
break;
}
} while (1);
}
return ret;
}
static struct usb_device *uhci_usb_allocate(struct usb_device *parent)
{
struct usb_device *usb_dev;
struct uhci_device *dev;
int i;
usb_dev = kmalloc(sizeof(*usb_dev), GFP_KERNEL);
if (!usb_dev)
return NULL;
memset(usb_dev, 0, sizeof(*usb_dev));
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
usb_destroy_configuration(usb_dev);
kfree(usb_dev);
return NULL;
}
/* Initialize "dev" */
memset(dev, 0, sizeof(*dev));
usb_dev->hcpriv = dev;
dev->usb = usb_dev;
usb_dev->parent = parent;
if (parent) {
usb_dev->bus = parent->bus;
dev->uhci = usb_to_uhci(parent)->uhci;
}
/* Reset the QH's and TD's */
for (i = 0; i < UHCI_MAXQH; i++) {
dev->qh[i].link = 1;
dev->qh[i].element = 1;
dev->qh[i].inuse = 0;
}
for (i = 0; i < UHCI_MAXTD; i++) {
dev->td[i].link = 1;
dev->td[i].inuse = 0;
}
return usb_dev;
}
static int uhci_usb_deallocate(struct usb_device *usb_dev)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
int i;
/* There are UHCI_MAXTD preallocated tds */
for (i = 0; i < UHCI_MAXTD; ++i) {
struct uhci_td *td = dev->td + i;
if (td->inuse & 1) {
uhci_remove_td(td);
/* And remove it from the irq list, if it's active */
if (td->status & (1 << 23))
td->status &= ~(1 << 23);
#if 0
uhci_remove_irq_list(td);
#endif
}
}
/* Remove the td from any queues */
for (i = 0; i < UHCI_MAXQH; ++i) {
struct uhci_qh *qh = dev->qh + i;
if (qh->inuse & 1)
uhci_remove_qh(qh->skel, qh);
}
kfree(dev);
usb_destroy_configuration(usb_dev);
kfree(usb_dev);
return 0;
}
struct usb_operations uhci_device_operations = {
uhci_usb_allocate,
uhci_usb_deallocate,
uhci_control_msg,
uhci_bulk_msg,
uhci_request_irq,
uhci_remove_irq,
};
/*
* This is just incredibly fragile. The timings must be just
* right, and they aren't really documented very well.
*
* Note the short delay between disabling reset and enabling
* the port..
*/
static void uhci_reset_port(unsigned int port)
{
unsigned short status;
status = inw(port);
outw(status | USBPORTSC_PR, port); /* reset port */
wait_ms(10);
outw(status & ~USBPORTSC_PR, port);
udelay(5);
status = inw(port);
outw(status | USBPORTSC_PE, port); /* enable port */
wait_ms(10);
status = inw(port);
if(!(status & USBPORTSC_PE)) {
outw(status | USBPORTSC_PE, port); /* one more try at enabling port */
wait_ms(50);
}
}
/*
* This gets called if the connect status on the root
* hub (and the root hub only) changes.
*/
static void uhci_connect_change(struct uhci *uhci, unsigned int port, unsigned int nr)
{
struct usb_device *usb_dev;
struct uhci_device *dev;
unsigned short status;
struct uhci_device *root_hub=usb_to_uhci(uhci->bus->root_hub);
printk("uhci_connect_change: called for %d\n", nr);
/*
* Even if the status says we're connected,
* the fact that the status bits changed may
* that we got disconnected and then reconnected.
*
* So start off by getting rid of any old devices..
*/
usb_disconnect(&root_hub->usb->children[nr]);
status = inw(port);
/* If we have nothing connected, then clear change status and disable the port */
status = (status & ~USBPORTSC_PE) | USBPORTSC_PEC;
if (!(status & USBPORTSC_CCS)) {
outw(status, port);
return;
}
/*
* Ok, we got a new connection. Allocate a device to it,
* and find out what it wants to do..
*/
usb_dev = uhci_usb_allocate(root_hub->usb);
dev = usb_dev->hcpriv;
dev->uhci = uhci;
usb_connect(usb_dev);
root_hub->usb->children[nr] = usb_dev;
wait_ms(200); /* wait for powerup */
uhci_reset_port(port);
/* Get speed information */
usb_dev->slow = (inw(port) & USBPORTSC_LSDA) ? 1 : 0;
/*
* Ok, all the stuff specific to the root hub has been done.
* The rest is generic for any new USB attach, regardless of
* hub type.
*/
usb_new_device(usb_dev);
}
/*
* This gets called when the root hub configuration
* has changed. Just go through each port, seeing if
* there is something interesting happening.
*/
static void uhci_check_configuration(struct uhci *uhci)
{
struct uhci_device * root_hub=usb_to_uhci(uhci->bus->root_hub);
unsigned int io_addr = uhci->io_addr + USBPORTSC1;
int maxchild = root_hub->usb->maxchild;
int nr = 0;
do {
unsigned short status = inw(io_addr);
if (status & USBPORTSC_CSC)
uhci_connect_change(uhci, io_addr, nr);
nr++; io_addr += 2;
} while (nr < maxchild);
}
static void uhci_interrupt_notify(struct uhci *uhci)
{
struct list_head *head = &uhci->interrupt_list;
struct list_head *tmp;
int status;
spin_lock(&irqlist_lock);
tmp = head->next;
while (tmp != head) {
struct uhci_td *td = list_entry(tmp, struct uhci_td, irq_list);
struct list_head *next;
next = tmp->next;
if (!((status = td->status) & (1 << 23)) || /* No longer active? */
((td->qh->element & ~15) &&
!((status = uhci_link_to_td(td->qh->element)->status) & (1 <<23)) &&
(status & 0x760000) /* is in error state (Stall, db, babble, timeout, bitstuff) */)) {
/* remove from IRQ list */
__list_del(tmp->prev, next);
INIT_LIST_HEAD(tmp);
if (td->completed(uhci_map_status(status, 0), bus_to_virt(td->buffer), -1, td->dev_id)) {
list_add(&td->irq_list, &uhci->interrupt_list);
if (!(td->status & (1 << 25))) {
struct uhci_qh *interrupt_qh = td->qh;
usb_dotoggle(td->dev, usb_pipeendpoint(td->info));
td->info &= ~(1 << 19); /* clear data toggle */
td->info |= usb_gettoggle(td->dev, usb_pipeendpoint(td->info)) << 19; /* toggle between data0 and data1 */
td->status = (td->status & 0x2f000000) | (1 << 23) | (1 << 24); /* active */
/* Remove then readd? Is that necessary */
uhci_remove_td(td);
uhci_insert_td_in_qh(interrupt_qh, td);
}
} else if (td->inuse & 2) {
struct uhci_qh *interrupt_qh = td->qh;
/* marked for removal */
td->inuse &= ~2;
usb_dotoggle(td->dev, usb_pipeendpoint(td->info));
uhci_remove_qh(interrupt_qh->skel, interrupt_qh);
uhci_qh_deallocate(interrupt_qh);
uhci_td_deallocate(td);
}
/* If completed wants to not reactivate, then it's */
/* responsible for free'ing the TD's and QH's */
/* or another function (such as run_control) */
}
tmp = next;
}
spin_unlock(&irqlist_lock);
}
/*
* Check port status - Connect Status Change - for
* each of the attached ports (defaults to two ports,
* but at least in theory there can be more of them).
*
* Wake up the configurator if something happened, we
* can't really do much at interrupt time.
*/
static void uhci_root_hub_events(struct uhci *uhci, unsigned int io_addr)
{
if (waitqueue_active(&uhci_configure)) {
struct uhci_device * root_hub=usb_to_uhci(uhci->bus->root_hub);
int ports = root_hub->usb->maxchild;
io_addr += USBPORTSC1;
do {
if (inw(io_addr) & USBPORTSC_CSC) {
wake_up(&uhci_configure);
return;
}
io_addr += 2;
} while (--ports > 0);
}
}
static void uhci_interrupt(int irq, void *__uhci, struct pt_regs *regs)
{
struct uhci *uhci = __uhci;
unsigned int io_addr = uhci->io_addr;
unsigned short status;
/*
* Read the interrupt status, and write it back to clear the interrupt cause
*/
status = inw(io_addr + USBSTS);
outw(status, io_addr + USBSTS);
// if ((status & ~0x21) != 0)
// printk("interrupt: %X\n", status);
/* Walk the list of pending TD's to see which ones completed.. */
uhci_interrupt_notify(uhci);
/* Check if there are any events on the root hub.. */
uhci_root_hub_events(uhci, io_addr);
}
/*
* We init one packet, and mark it just IOC and _not_
* active. Which will result in no actual USB traffic,
* but _will_ result in an interrupt every second.
*
* Which is exactly what we want.
*/
static void uhci_init_ticktd(struct uhci *uhci)
{
struct uhci_device *dev = usb_to_uhci(uhci->bus->root_hub);
struct uhci_td *td = uhci_td_allocate(dev);
td->link = 1;
td->status = (1 << 24); /* interrupt on completion */
td->info = (15 << 21) | 0x7f69; /* (ignored) input packet, 16 bytes, device 127 */
td->buffer = 0;
td->first = td;
td->qh = NULL;
uhci->fl->frame[0] = virt_to_bus(td);
}
static void reset_hc(struct uhci *uhci)
{
unsigned int io_addr = uhci->io_addr;
/* Global reset for 50ms */
outw(USBCMD_GRESET, io_addr+USBCMD);
wait_ms(50);
outw(0, io_addr+USBCMD);
wait_ms(10);
}
static void start_hc(struct uhci *uhci)
{
unsigned int io_addr = uhci->io_addr;
int timeout = 1000;
uhci_init_ticktd(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) {
printk("USBCMD_HCRESET timed out!\n");
break;
}
}
outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP, io_addr + USBINTR);
outw(0, io_addr + USBFRNUM);
outl(virt_to_bus(uhci->fl), io_addr + USBFLBASEADD);
/* Run and mark it configured with a 64-byte max packet */
outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, io_addr + USBCMD);
}
/*
* Allocate a frame list, and four regular queues.
*
* The hardware doesn't really know any difference
* in the queues, but the order does matter for the
* protocols higher up. The order is:
*
* - any isochronous events handled before any
* of the queues. We don't do that here, because
* we'll create the actual TD entries on demand.
* - The first queue is the "interrupt queue".
* - The second queue is the "control queue".
* - The third queue is "bulk data".
*
* We could certainly have multiple queues of the same
* type, and maybe we should. We could have per-device
* queues, for example. We begin small.
*/
static struct uhci *alloc_uhci(unsigned int io_addr)
{
int i;
struct uhci *uhci;
struct usb_bus *bus;
struct uhci_device *dev;
struct usb_device *usb;
uhci = kmalloc(sizeof(*uhci), GFP_KERNEL);
if (!uhci)
return NULL;
memset(uhci, 0, sizeof(*uhci));
uhci->irq = -1;
uhci->io_addr = io_addr;
INIT_LIST_HEAD(&uhci->interrupt_list);
/* We need exactly one page (per UHCI specs), how convenient */
uhci->fl = (void *)__get_free_page(GFP_KERNEL);
bus = kmalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
return NULL;
memset(bus, 0, sizeof(*bus));
uhci->bus = bus;
bus->hcpriv = uhci;
bus->op = &uhci_device_operations;
/*
* We allocate a 8kB area for the UHCI hub. The area
* is described by the uhci_device structure, and basically
* contains everything needed for normal operation.
*
* The first page is the actual device descriptor for the
* hub.
*
* The second page is used for the frame list.
*/
usb = uhci_usb_allocate(NULL);
if (!usb)
return NULL;
usb->bus = bus;
dev = usb_to_uhci(usb);
uhci->bus->root_hub=uhci_to_usb(dev);
/* Initialize the root hub */
/* 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 */
usb->maxchild = 2;
usb_init_root_hub(usb);
/*
* Initialize the queues. They all start out empty,
* linked to each other in the proper order.
*/
for (i = 1 ; i < 9; i++) {
dev->qh[i].link = 2 | virt_to_bus(&dev->skel_control_qh);
dev->qh[i].element = 1;
}
dev->skel_control_qh.link = 2 | virt_to_bus(&dev->skel_bulk0_qh);
dev->skel_control_qh.element = 1;
dev->skel_bulk0_qh.link = 2 | virt_to_bus(&dev->skel_bulk1_qh);
dev->skel_bulk0_qh.element = 1;
dev->skel_bulk1_qh.link = 2 | virt_to_bus(&dev->skel_bulk2_qh);
dev->skel_bulk1_qh.element = 1;
dev->skel_bulk2_qh.link = 2 | virt_to_bus(&dev->skel_bulk3_qh);
dev->skel_bulk2_qh.element = 1;
dev->skel_bulk3_qh.link = 1;
dev->skel_bulk3_qh.element = 1;
/*
* Fill the frame list: make all entries point to
* the proper interrupt queue.
*
* This is probably silly, but it's a simple way to
* scatter the interrupt queues in a way that gives
* us a reasonable dynamic range for irq latencies.
*/
for (i = 0; i < 1024; i++) {
struct uhci_qh * irq = &dev->skel_int2_qh;
if (i & 1) {
irq++;
if (i & 2) {
irq++;
if (i & 4) {
irq++;
if (i & 8) {
irq++;
if (i & 16) {
irq++;
if (i & 32) {
irq++;
if (i & 64) {
irq++;
}
}
}
}
}
}
}
uhci->fl->frame[i] = 2 | virt_to_bus(irq);
}
return uhci;
}
/*
* De-allocate all resources..
*/
static void release_uhci(struct uhci *uhci)
{
if (uhci->irq >= 0) {
free_irq(uhci->irq, uhci);
uhci->irq = -1;
}
#if 0
if (uhci->bus->root_hub) {
uhci_usb_deallocate(uhci_to_usb(uhci->bus->root_hub));
uhci->bus->root_hub = NULL;
}
#endif
if (uhci->fl) {
free_page((unsigned long)uhci->fl);
uhci->fl = NULL;
}
kfree(uhci->bus);
kfree(uhci);
}
static int uhci_control_thread(void * __uhci)
{
struct uhci *uhci = (struct uhci *)__uhci;
struct uhci_device * root_hub =usb_to_uhci(uhci->bus->root_hub);
lock_kernel();
request_region(uhci->io_addr, 32, "usb-uhci");
/*
* This thread doesn't need any user-level access,
* so get rid of all our resources..
*/
printk("uhci_control_thread at %p\n", &uhci_control_thread);
exit_mm(current);
exit_files(current);
//exit_fs(current);
strcpy(current->comm, "uhci-control");
/*
* Ok, all systems are go..
*/
start_hc(uhci);
usb_register_bus(uhci->bus);
for(;;) {
siginfo_t info;
int unsigned long signr;
interruptible_sleep_on(&uhci_configure);
#ifdef CONFIG_APM
if (apm_resume) {
apm_resume = 0;
start_hc(uhci);
continue;
}
#endif
uhci_check_configuration(uhci);
if(signal_pending(current)) {
/* sending SIGUSR1 makes us print out some info */
spin_lock_irq(¤t->sigmask_lock);
signr = dequeue_signal(¤t->blocked, &info);
spin_unlock_irq(¤t->sigmask_lock);
if(signr == SIGUSR1) {
printk("UHCI queue dump:\n");
show_queues(uhci);
} else if (signr == SIGUSR2) {
printk("UHCI debug toggle\n");
uhci_debug = !uhci_debug;
} else {
break;
}
}
}
{
int i;
if(root_hub)
for(i = 0; i < root_hub->usb->maxchild; i++)
usb_disconnect(root_hub->usb->children + i);
}
usb_deregister_bus(uhci->bus);
reset_hc(uhci);
release_region(uhci->io_addr, 32);
release_uhci(uhci);
MOD_DEC_USE_COUNT;
printk("uhci_control_thread exiting\n");
return 0;
}
/*
* If we've successfully found a UHCI, now is the time to increment the
* module usage count, start the control thread, and return success..
*/
static int found_uhci(int irq, unsigned int io_addr)
{
int retval;
struct uhci *uhci;
uhci = alloc_uhci(io_addr);
if (!uhci)
return -ENOMEM;
reset_hc(uhci);
retval = -EBUSY;
if (request_irq(irq, uhci_interrupt, SA_SHIRQ, "usb", uhci) == 0) {
int pid;
MOD_INC_USE_COUNT;
uhci->irq = irq;
pid = kernel_thread(uhci_control_thread, uhci,
CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
if (pid >= 0)
return 0;
MOD_DEC_USE_COUNT;
retval = pid;
}
release_uhci(uhci);
return retval;
}
static int start_uhci(struct pci_dev *dev)
{
int i;
/* Search for the IO base address.. */
for (i = 0; i < 6; i++) {
unsigned int io_addr = dev->base_address[i];
/* IO address? */
if (!(io_addr & 1))
continue;
io_addr &= PCI_BASE_ADDRESS_IO_MASK;
/* Is it already in use? */
if (check_region(io_addr, 32))
break;
return found_uhci(dev->irq, io_addr);
}
return -1;
}
#ifdef CONFIG_APM
static int handle_apm_event(apm_event_t event)
{
static int down = 0;
switch (event) {
case APM_SYS_SUSPEND:
case APM_USER_SUSPEND:
if (down) {
printk(KERN_DEBUG "uhci: received extra suspend event\n");
break;
}
down = 1;
break;
case APM_NORMAL_RESUME:
case APM_CRITICAL_RESUME:
if (!down) {
printk(KERN_DEBUG "uhci: received bogus resume event\n");
break;
}
down = 0;
if (waitqueue_active(&uhci_configure)) {
apm_resume = 1;
wake_up(&uhci_configure);
}
break;
}
return 0;
}
#endif
int uhci_init(void)
{
int retval;
struct pci_dev *dev = NULL;
u8 type;
retval = -ENODEV;
for (;;) {
dev = pci_find_class(PCI_CLASS_SERIAL_USB<<8, dev);
if (!dev)
break;
/* Is it UHCI */
pci_read_config_byte(dev, PCI_CLASS_PROG, &type);
if(type != 0)
continue;
/* Ok set it up */
retval = start_uhci(dev);
if (retval < 0)
continue;
#ifdef CONFIG_APM
apm_register_callback(&handle_apm_event);
#endif
return 0;
}
return retval;
}
#ifdef MODULE
int init_module(void)
{
return uhci_init();
}
void cleanup_module(void)
{
#ifdef CONFIG_APM
apm_unregister_callback(&handle_apm_event);
#endif
}
#endif //MODULE
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