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/*
* URB OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2001 David Brownell <dbrownell@users.sourceforge.net>
*
* [ Initialisation is based on Linus' ]
* [ uhci code and gregs ohci fragments ]
* [ (C) Copyright 1999 Linus Torvalds ]
* [ (C) Copyright 1999 Gregory P. Smith]
*
*
* History:
*
* 2001/09/19 USB_ZERO_PACKET support (Jean Tourrilhes)
* 2001/07/17 power management and pmac cleanup (Benjamin Herrenschmidt)
* 2001/03/24 td/ed hashing to remove bus_to_virt (Steve Longerbeam);
pci_map_single (db)
* 2001/03/21 td and dev/ed allocation uses new pci_pool API (db)
* 2001/03/07 hcca allocation uses pci_alloc_consistent (Steve Longerbeam)
*
* 2000/09/26 fixed races in removing the private portion of the urb
* 2000/09/07 disable bulk and control lists when unlinking the last
* endpoint descriptor in order to avoid unrecoverable errors on
* the Lucent chips. (rwc@sgi)
* 2000/08/29 use bandwidth claiming hooks (thanks Randy!), fix some
* urb unlink probs, indentation fixes
* 2000/08/11 various oops fixes mostly affecting iso and cleanup from
* device unplugs.
* 2000/06/28 use PCI hotplug framework, for better power management
* and for Cardbus support (David Brownell)
* 2000/earlier: fixes for NEC/Lucent chips; suspend/resume handling
* when the controller loses power; handle UE; cleanup; ...
*
* v5.2 1999/12/07 URB 3rd preview,
* v5.1 1999/11/30 URB 2nd preview, cpia, (usb-scsi)
* v5.0 1999/11/22 URB Technical preview, Paul Mackerras powerbook susp/resume
* i386: HUB, Keyboard, Mouse, Printer
*
* v4.3 1999/10/27 multiple HCs, bulk_request
* v4.2 1999/09/05 ISO API alpha, new dev alloc, neg Error-codes
* v4.1 1999/08/27 Randy Dunlap's - ISO API first impl.
* v4.0 1999/08/18
* v3.0 1999/06/25
* v2.1 1999/05/09 code clean up
* v2.0 1999/05/04
* v1.0 1999/04/27 initial release
*/
#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() */
#undef DEBUG
#include <linux/usb.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#define OHCI_USE_NPS // force NoPowerSwitching mode
// #define OHCI_VERBOSE_DEBUG /* not always helpful */
#include "usb-ohci.h"
#ifdef CONFIG_PMAC_PBOOK
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/pci-bridge.h>
#ifndef CONFIG_PM
#define CONFIG_PM
#endif
#endif
/*
* Version Information
*/
#define DRIVER_VERSION "v5.3"
#define DRIVER_AUTHOR "Roman Weissgaerber <weissg@vienna.at>, David Brownell"
#define DRIVER_DESC "USB OHCI Host Controller Driver"
/* For initializing controller (mask in an HCFS mode too) */
#define OHCI_CONTROL_INIT \
(OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE
#define OHCI_UNLINK_TIMEOUT (HZ / 10)
static LIST_HEAD (ohci_hcd_list);
static spinlock_t usb_ed_lock = SPIN_LOCK_UNLOCKED;
/*-------------------------------------------------------------------------*/
/* AMD-756 (D2 rev) reports corrupt register contents in some cases.
* The erratum (#4) description is incorrect. AMD's workaround waits
* till some bits (mostly reserved) are clear; ok for all revs.
*/
#define read_roothub(hc, register, mask) ({ \
u32 temp = readl (&hc->regs->roothub.register); \
if (hc->flags & OHCI_QUIRK_AMD756) \
while (temp & mask) \
temp = readl (&hc->regs->roothub.register); \
temp; })
static u32 roothub_a (struct ohci *hc)
{ return read_roothub (hc, a, 0xfc0fe000); }
static inline u32 roothub_b (struct ohci *hc)
{ return readl (&hc->regs->roothub.b); }
static inline u32 roothub_status (struct ohci *hc)
{ return readl (&hc->regs->roothub.status); }
static u32 roothub_portstatus (struct ohci *hc, int i)
{ return read_roothub (hc, portstatus [i], 0xffe0fce0); }
/*-------------------------------------------------------------------------*
* URB support functions
*-------------------------------------------------------------------------*/
/* free HCD-private data associated with this URB */
static void urb_free_priv (struct ohci *hc, urb_priv_t * urb_priv)
{
int i;
int last = urb_priv->length - 1;
int len;
int dir;
struct td *td;
if (last >= 0) {
/* ISOC, BULK, INTR data buffer starts at td 0
* CTRL setup starts at td 0 */
td = urb_priv->td [0];
len = td->urb->transfer_buffer_length,
dir = usb_pipeout (td->urb->pipe)
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE;
/* unmap CTRL URB setup */
if (usb_pipecontrol (td->urb->pipe)) {
pci_unmap_single (hc->ohci_dev,
td->data_dma, 8, PCI_DMA_TODEVICE);
/* CTRL data buffer starts at td 1 if len > 0 */
if (len && last > 0)
td = urb_priv->td [1];
}
/* unmap data buffer */
if (len && td->data_dma)
pci_unmap_single (hc->ohci_dev, td->data_dma, len, dir);
for (i = 0; i <= last; i++) {
td = urb_priv->td [i];
if (td)
td_free (hc, td);
}
}
kfree (urb_priv);
}
static void urb_rm_priv_locked (urb_t * urb)
{
urb_priv_t * urb_priv = urb->hcpriv;
if (urb_priv) {
urb->hcpriv = NULL;
#ifdef DO_TIMEOUTS
if (urb->timeout) {
list_del (&urb->urb_list);
urb->timeout -= jiffies;
}
#endif
/* Release int/iso bandwidth */
if (urb->bandwidth) {
switch (usb_pipetype(urb->pipe)) {
case PIPE_INTERRUPT:
usb_release_bandwidth (urb->dev, urb, 0);
break;
case PIPE_ISOCHRONOUS:
usb_release_bandwidth (urb->dev, urb, 1);
break;
default:
break;
}
}
urb_free_priv ((struct ohci *)urb->dev->bus->hcpriv, urb_priv);
usb_dec_dev_use (urb->dev);
urb->dev = NULL;
}
}
static void urb_rm_priv (urb_t * urb)
{
unsigned long flags;
spin_lock_irqsave (&usb_ed_lock, flags);
urb_rm_priv_locked (urb);
spin_unlock_irqrestore (&usb_ed_lock, flags);
}
/*-------------------------------------------------------------------------*/
#ifdef DEBUG
static int sohci_get_current_frame_number (struct usb_device * dev);
/* debug| print the main components of an URB
* small: 0) header + data packets 1) just header */
static void urb_print (urb_t * urb, char * str, int small)
{
unsigned int pipe= urb->pipe;
if (!urb->dev || !urb->dev->bus) {
dbg("%s URB: no dev", str);
return;
}
#ifndef OHCI_VERBOSE_DEBUG
if (urb->status != 0)
#endif
dbg("%s URB:[%4x] dev:%2d,ep:%2d-%c,type:%s,flags:%4x,len:%d/%d,stat:%d(%x)",
str,
sohci_get_current_frame_number (urb->dev),
usb_pipedevice (pipe),
usb_pipeendpoint (pipe),
usb_pipeout (pipe)? 'O': 'I',
usb_pipetype (pipe) < 2? (usb_pipeint (pipe)? "INTR": "ISOC"):
(usb_pipecontrol (pipe)? "CTRL": "BULK"),
urb->transfer_flags,
urb->actual_length,
urb->transfer_buffer_length,
urb->status, urb->status);
#ifdef OHCI_VERBOSE_DEBUG
if (!small) {
int i, len;
if (usb_pipecontrol (pipe)) {
printk (KERN_DEBUG __FILE__ ": cmd(8):");
for (i = 0; i < 8 ; i++)
printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
printk ("\n");
}
if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
printk (KERN_DEBUG __FILE__ ": data(%d/%d):",
urb->actual_length,
urb->transfer_buffer_length);
len = usb_pipeout (pipe)?
urb->transfer_buffer_length: urb->actual_length;
for (i = 0; i < 16 && i < len; i++)
printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
printk ("%s stat:%d\n", i < len? "...": "", urb->status);
}
}
#endif
}
/* just for debugging; prints non-empty branches of the int ed tree inclusive iso eds*/
void ep_print_int_eds (ohci_t * ohci, char * str) {
int i, j;
__u32 * ed_p;
for (i= 0; i < 32; i++) {
j = 5;
ed_p = &(ohci->hcca->int_table [i]);
if (*ed_p == 0)
continue;
printk (KERN_DEBUG __FILE__ ": %s branch int %2d(%2x):", str, i, i);
while (*ed_p != 0 && j--) {
ed_t *ed = dma_to_ed (ohci, le32_to_cpup(ed_p));
printk (" ed: %4x;", ed->hwINFO);
ed_p = &ed->hwNextED;
}
printk ("\n");
}
}
static void ohci_dump_intr_mask (char *label, __u32 mask)
{
dbg ("%s: 0x%08x%s%s%s%s%s%s%s%s%s",
label,
mask,
(mask & OHCI_INTR_MIE) ? " MIE" : "",
(mask & OHCI_INTR_OC) ? " OC" : "",
(mask & OHCI_INTR_RHSC) ? " RHSC" : "",
(mask & OHCI_INTR_FNO) ? " FNO" : "",
(mask & OHCI_INTR_UE) ? " UE" : "",
(mask & OHCI_INTR_RD) ? " RD" : "",
(mask & OHCI_INTR_SF) ? " SF" : "",
(mask & OHCI_INTR_WDH) ? " WDH" : "",
(mask & OHCI_INTR_SO) ? " SO" : ""
);
}
static void maybe_print_eds (char *label, __u32 value)
{
if (value)
dbg ("%s %08x", label, value);
}
static char *hcfs2string (int state)
{
switch (state) {
case OHCI_USB_RESET: return "reset";
case OHCI_USB_RESUME: return "resume";
case OHCI_USB_OPER: return "operational";
case OHCI_USB_SUSPEND: return "suspend";
}
return "?";
}
// dump control and status registers
static void ohci_dump_status (ohci_t *controller)
{
struct ohci_regs *regs = controller->regs;
__u32 temp;
temp = readl (®s->revision) & 0xff;
if (temp != 0x10)
dbg ("spec %d.%d", (temp >> 4), (temp & 0x0f));
temp = readl (®s->control);
dbg ("control: 0x%08x%s%s%s HCFS=%s%s%s%s%s CBSR=%d", temp,
(temp & OHCI_CTRL_RWE) ? " RWE" : "",
(temp & OHCI_CTRL_RWC) ? " RWC" : "",
(temp & OHCI_CTRL_IR) ? " IR" : "",
hcfs2string (temp & OHCI_CTRL_HCFS),
(temp & OHCI_CTRL_BLE) ? " BLE" : "",
(temp & OHCI_CTRL_CLE) ? " CLE" : "",
(temp & OHCI_CTRL_IE) ? " IE" : "",
(temp & OHCI_CTRL_PLE) ? " PLE" : "",
temp & OHCI_CTRL_CBSR
);
temp = readl (®s->cmdstatus);
dbg ("cmdstatus: 0x%08x SOC=%d%s%s%s%s", temp,
(temp & OHCI_SOC) >> 16,
(temp & OHCI_OCR) ? " OCR" : "",
(temp & OHCI_BLF) ? " BLF" : "",
(temp & OHCI_CLF) ? " CLF" : "",
(temp & OHCI_HCR) ? " HCR" : ""
);
ohci_dump_intr_mask ("intrstatus", readl (®s->intrstatus));
ohci_dump_intr_mask ("intrenable", readl (®s->intrenable));
// intrdisable always same as intrenable
// ohci_dump_intr_mask ("intrdisable", readl (®s->intrdisable));
maybe_print_eds ("ed_periodcurrent", readl (®s->ed_periodcurrent));
maybe_print_eds ("ed_controlhead", readl (®s->ed_controlhead));
maybe_print_eds ("ed_controlcurrent", readl (®s->ed_controlcurrent));
maybe_print_eds ("ed_bulkhead", readl (®s->ed_bulkhead));
maybe_print_eds ("ed_bulkcurrent", readl (®s->ed_bulkcurrent));
maybe_print_eds ("donehead", readl (®s->donehead));
}
static void ohci_dump_roothub (ohci_t *controller, int verbose)
{
__u32 temp, ndp, i;
temp = roothub_a (controller);
ndp = (temp & RH_A_NDP);
if (verbose) {
dbg ("roothub.a: %08x POTPGT=%d%s%s%s%s%s NDP=%d", temp,
((temp & RH_A_POTPGT) >> 24) & 0xff,
(temp & RH_A_NOCP) ? " NOCP" : "",
(temp & RH_A_OCPM) ? " OCPM" : "",
(temp & RH_A_DT) ? " DT" : "",
(temp & RH_A_NPS) ? " NPS" : "",
(temp & RH_A_PSM) ? " PSM" : "",
ndp
);
temp = roothub_b (controller);
dbg ("roothub.b: %08x PPCM=%04x DR=%04x",
temp,
(temp & RH_B_PPCM) >> 16,
(temp & RH_B_DR)
);
temp = roothub_status (controller);
dbg ("roothub.status: %08x%s%s%s%s%s%s",
temp,
(temp & RH_HS_CRWE) ? " CRWE" : "",
(temp & RH_HS_OCIC) ? " OCIC" : "",
(temp & RH_HS_LPSC) ? " LPSC" : "",
(temp & RH_HS_DRWE) ? " DRWE" : "",
(temp & RH_HS_OCI) ? " OCI" : "",
(temp & RH_HS_LPS) ? " LPS" : ""
);
}
for (i = 0; i < ndp; i++) {
temp = roothub_portstatus (controller, i);
dbg ("roothub.portstatus [%d] = 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s",
i,
temp,
(temp & RH_PS_PRSC) ? " PRSC" : "",
(temp & RH_PS_OCIC) ? " OCIC" : "",
(temp & RH_PS_PSSC) ? " PSSC" : "",
(temp & RH_PS_PESC) ? " PESC" : "",
(temp & RH_PS_CSC) ? " CSC" : "",
(temp & RH_PS_LSDA) ? " LSDA" : "",
(temp & RH_PS_PPS) ? " PPS" : "",
(temp & RH_PS_PRS) ? " PRS" : "",
(temp & RH_PS_POCI) ? " POCI" : "",
(temp & RH_PS_PSS) ? " PSS" : "",
(temp & RH_PS_PES) ? " PES" : "",
(temp & RH_PS_CCS) ? " CCS" : ""
);
}
}
static void ohci_dump (ohci_t *controller, int verbose)
{
dbg ("OHCI controller usb-%s state", controller->ohci_dev->slot_name);
// dumps some of the state we know about
ohci_dump_status (controller);
if (verbose)
ep_print_int_eds (controller, "hcca");
dbg ("hcca frame #%04x", controller->hcca->frame_no);
ohci_dump_roothub (controller, 1);
}
#endif
/*-------------------------------------------------------------------------*
* Interface functions (URB)
*-------------------------------------------------------------------------*/
/* return a request to the completion handler */
static int sohci_return_urb (struct ohci *hc, urb_t * urb)
{
urb_priv_t * urb_priv = urb->hcpriv;
urb_t * urbt;
unsigned long flags;
int i;
if (!urb_priv)
return -1; /* urb already unlinked */
/* just to be sure */
if (!urb->complete) {
urb_rm_priv (urb);
return -1;
}
#ifdef DEBUG
urb_print (urb, "RET", usb_pipeout (urb->pipe));
#endif
switch (usb_pipetype (urb->pipe)) {
case PIPE_INTERRUPT:
pci_unmap_single (hc->ohci_dev,
urb_priv->td [0]->data_dma,
urb->transfer_buffer_length,
usb_pipeout (urb->pipe)
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE);
urb->complete (urb);
/* implicitly requeued */
urb->actual_length = 0;
urb->status = USB_ST_URB_PENDING;
if (urb_priv->state != URB_DEL)
td_submit_urb (urb);
break;
case PIPE_ISOCHRONOUS:
for (urbt = urb->next; urbt && (urbt != urb); urbt = urbt->next);
if (urbt) { /* send the reply and requeue URB */
pci_unmap_single (hc->ohci_dev,
urb_priv->td [0]->data_dma,
urb->transfer_buffer_length,
usb_pipeout (urb->pipe)
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE);
urb->complete (urb);
spin_lock_irqsave (&usb_ed_lock, flags);
urb->actual_length = 0;
urb->status = USB_ST_URB_PENDING;
urb->start_frame = urb_priv->ed->last_iso + 1;
if (urb_priv->state != URB_DEL) {
for (i = 0; i < urb->number_of_packets; i++) {
urb->iso_frame_desc[i].actual_length = 0;
urb->iso_frame_desc[i].status = -EXDEV;
}
td_submit_urb (urb);
}
spin_unlock_irqrestore (&usb_ed_lock, flags);
} else { /* unlink URB, call complete */
urb_rm_priv (urb);
urb->complete (urb);
}
break;
case PIPE_BULK:
case PIPE_CONTROL: /* unlink URB, call complete */
urb_rm_priv (urb);
urb->complete (urb);
break;
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* get a transfer request */
static int sohci_submit_urb (urb_t * urb)
{
ohci_t * ohci;
ed_t * ed;
urb_priv_t * urb_priv;
unsigned int pipe = urb->pipe;
int maxps = usb_maxpacket (urb->dev, pipe, usb_pipeout (pipe));
int i, size = 0;
unsigned long flags;
int bustime = 0;
int mem_flags = ALLOC_FLAGS;
if (!urb->dev || !urb->dev->bus)
return -ENODEV;
if (urb->hcpriv) /* urb already in use */
return -EINVAL;
// if(usb_endpoint_halted (urb->dev, usb_pipeendpoint (pipe), usb_pipeout (pipe)))
// return -EPIPE;
usb_inc_dev_use (urb->dev);
ohci = (ohci_t *) urb->dev->bus->hcpriv;
#ifdef DEBUG
urb_print (urb, "SUB", usb_pipein (pipe));
#endif
/* handle a request to the virtual root hub */
if (usb_pipedevice (pipe) == ohci->rh.devnum)
return rh_submit_urb (urb);
/* when controller's hung, permit only roothub cleanup attempts
* such as powering down ports */
if (ohci->disabled) {
usb_dec_dev_use (urb->dev);
return -ESHUTDOWN;
}
/* every endpoint has a ed, locate and fill it */
if (!(ed = ep_add_ed (urb->dev, pipe, urb->interval, 1, mem_flags))) {
usb_dec_dev_use (urb->dev);
return -ENOMEM;
}
/* for the private part of the URB we need the number of TDs (size) */
switch (usb_pipetype (pipe)) {
case PIPE_BULK: /* one TD for every 4096 Byte */
size = (urb->transfer_buffer_length - 1) / 4096 + 1;
/* If the transfer size is multiple of the pipe mtu,
* we may need an extra TD to create a empty frame
* Jean II */
if ((urb->transfer_flags & USB_ZERO_PACKET) &&
usb_pipeout (pipe) &&
(urb->transfer_buffer_length != 0) &&
((urb->transfer_buffer_length % maxps) == 0))
size++;
break;
case PIPE_ISOCHRONOUS: /* number of packets from URB */
size = urb->number_of_packets;
if (size <= 0) {
usb_dec_dev_use (urb->dev);
return -EINVAL;
}
for (i = 0; i < urb->number_of_packets; i++) {
urb->iso_frame_desc[i].actual_length = 0;
urb->iso_frame_desc[i].status = -EXDEV;
}
break;
case PIPE_CONTROL: /* 1 TD for setup, 1 for ACK and 1 for every 4096 B */
size = (urb->transfer_buffer_length == 0)? 2:
(urb->transfer_buffer_length - 1) / 4096 + 3;
break;
case PIPE_INTERRUPT: /* one TD */
size = 1;
break;
}
/* allocate the private part of the URB */
urb_priv = kmalloc (sizeof (urb_priv_t) + size * sizeof (td_t *),
in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
if (!urb_priv) {
usb_dec_dev_use (urb->dev);
return -ENOMEM;
}
memset (urb_priv, 0, sizeof (urb_priv_t) + size * sizeof (td_t *));
/* fill the private part of the URB */
urb_priv->length = size;
urb_priv->ed = ed;
/* allocate the TDs (updating hash chains) */
spin_lock_irqsave (&usb_ed_lock, flags);
for (i = 0; i < size; i++) {
urb_priv->td[i] = td_alloc (ohci, SLAB_ATOMIC);
if (!urb_priv->td[i]) {
urb_priv->length = i;
urb_free_priv (ohci, urb_priv);
spin_unlock_irqrestore (&usb_ed_lock, flags);
usb_dec_dev_use (urb->dev);
return -ENOMEM;
}
}
if (ed->state == ED_NEW || (ed->state & ED_DEL)) {
urb_free_priv (ohci, urb_priv);
spin_unlock_irqrestore (&usb_ed_lock, flags);
usb_dec_dev_use (urb->dev);
return -EINVAL;
}
/* allocate and claim bandwidth if needed; ISO
* needs start frame index if it was't provided.
*/
switch (usb_pipetype (pipe)) {
case PIPE_ISOCHRONOUS:
if (urb->transfer_flags & USB_ISO_ASAP) {
urb->start_frame = ((ed->state == ED_OPER)
? (ed->last_iso + 1)
: (le16_to_cpu (ohci->hcca->frame_no) + 10)) & 0xffff;
}
/* FALLTHROUGH */
case PIPE_INTERRUPT:
if (urb->bandwidth == 0) {
bustime = usb_check_bandwidth (urb->dev, urb);
}
if (bustime < 0) {
urb_free_priv (ohci, urb_priv);
spin_unlock_irqrestore (&usb_ed_lock, flags);
usb_dec_dev_use (urb->dev);
return bustime;
}
usb_claim_bandwidth (urb->dev, urb, bustime, usb_pipeisoc (urb->pipe));
#ifdef DO_TIMEOUTS
urb->timeout = 0;
#endif
}
urb->actual_length = 0;
urb->hcpriv = urb_priv;
urb->status = USB_ST_URB_PENDING;
/* link the ed into a chain if is not already */
if (ed->state != ED_OPER)
ep_link (ohci, ed);
/* fill the TDs and link it to the ed */
td_submit_urb (urb);
#ifdef DO_TIMEOUTS
/* maybe add to ordered list of timeouts */
if (urb->timeout) {
struct list_head *entry;
// FIXME: usb-uhci uses relative timeouts (like this),
// while uhci uses absolute ones (probably better).
// Pick one solution and change the affected drivers.
urb->timeout += jiffies;
list_for_each (entry, &ohci->timeout_list) {
struct urb *next_urb;
next_urb = list_entry (entry, struct urb, urb_list);
if (time_after_eq (urb->timeout, next_urb->timeout))
break;
}
list_add (&urb->urb_list, entry);
/* drive timeouts by SF (messy, but works) */
writel (OHCI_INTR_SF, &ohci->regs->intrenable);
}
#endif
spin_unlock_irqrestore (&usb_ed_lock, flags);
return 0;
}
/*-------------------------------------------------------------------------*/
/* deactivate all TDs and remove the private part of the URB */
/* interrupt callers must use async unlink mode */
static int sohci_unlink_urb (urb_t * urb)
{
unsigned long flags;
ohci_t * ohci;
if (!urb) /* just to be sure */
return -EINVAL;
if (!urb->dev || !urb->dev->bus)
return -ENODEV;
ohci = (ohci_t *) urb->dev->bus->hcpriv;
#ifdef DEBUG
urb_print (urb, "UNLINK", 1);
#endif
/* handle a request to the virtual root hub */
if (usb_pipedevice (urb->pipe) == ohci->rh.devnum)
return rh_unlink_urb (urb);
if (urb->hcpriv && (urb->status == USB_ST_URB_PENDING)) {
if (!ohci->disabled) {
urb_priv_t * urb_priv;
/* interrupt code may not sleep; it must use
* async status return to unlink pending urbs.
*/
if (!(urb->transfer_flags & USB_ASYNC_UNLINK)
&& in_interrupt ()) {
err ("bug in call from %p; use async!",
__builtin_return_address(0));
return -EWOULDBLOCK;
}
/* flag the urb and its TDs for deletion in some
* upcoming SF interrupt delete list processing
*/
spin_lock_irqsave (&usb_ed_lock, flags);
urb_priv = urb->hcpriv;
if (!urb_priv || (urb_priv->state == URB_DEL)) {
spin_unlock_irqrestore (&usb_ed_lock, flags);
return 0;
}
urb_priv->state = URB_DEL;
ep_rm_ed (urb->dev, urb_priv->ed);
urb_priv->ed->state |= ED_URB_DEL;
if (!(urb->transfer_flags & USB_ASYNC_UNLINK)) {
DECLARE_WAIT_QUEUE_HEAD (unlink_wakeup);
DECLARE_WAITQUEUE (wait, current);
int timeout = OHCI_UNLINK_TIMEOUT;
add_wait_queue (&unlink_wakeup, &wait);
urb_priv->wait = &unlink_wakeup;
spin_unlock_irqrestore (&usb_ed_lock, flags);
/* wait until all TDs are deleted */
set_current_state(TASK_UNINTERRUPTIBLE);
while (timeout && (urb->status == USB_ST_URB_PENDING))
timeout = schedule_timeout (timeout);
set_current_state(TASK_RUNNING);
remove_wait_queue (&unlink_wakeup, &wait);
if (urb->status == USB_ST_URB_PENDING) {
err ("unlink URB timeout");
return -ETIMEDOUT;
}
} else {
/* usb_dec_dev_use done in dl_del_list() */
urb->status = -EINPROGRESS;
spin_unlock_irqrestore (&usb_ed_lock, flags);
}
} else {
urb_rm_priv (urb);
if (urb->transfer_flags & USB_ASYNC_UNLINK) {
urb->status = -ECONNRESET;
if (urb->complete)
urb->complete (urb);
} else
urb->status = -ENOENT;
}
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* allocate private data space for a usb device */
static int sohci_alloc_dev (struct usb_device *usb_dev)
{
struct ohci_device * dev;
dev = dev_alloc ((struct ohci *) usb_dev->bus->hcpriv, ALLOC_FLAGS);
if (!dev)
return -ENOMEM;
usb_dev->hcpriv = dev;
return 0;
}
/*-------------------------------------------------------------------------*/
/* may be called from interrupt context */
/* frees private data space of usb device */
static int sohci_free_dev (struct usb_device * usb_dev)
{
unsigned long flags;
int i, cnt = 0;
ed_t * ed;
struct ohci_device * dev = usb_to_ohci (usb_dev);
ohci_t * ohci = usb_dev->bus->hcpriv;
if (!dev)
return 0;
if (usb_dev->devnum >= 0) {
/* driver disconnects should have unlinked all urbs
* (freeing all the TDs, unlinking EDs) but we need
* to defend against bugs that prevent that.
*/
spin_lock_irqsave (&usb_ed_lock, flags);
for(i = 0; i < NUM_EDS; i++) {
ed = &(dev->ed[i]);
if (ed->state != ED_NEW) {
if (ed->state == ED_OPER) {
/* driver on that interface didn't unlink an urb */
dbg ("driver usb-%s dev %d ed 0x%x unfreed URB",
ohci->ohci_dev->slot_name, usb_dev->devnum, i);
ep_unlink (ohci, ed);
}
ep_rm_ed (usb_dev, ed);
ed->state = ED_DEL;
cnt++;
}
}
spin_unlock_irqrestore (&usb_ed_lock, flags);
/* if the controller is running, tds for those unlinked
* urbs get freed by dl_del_list at the next SF interrupt
*/
if (cnt > 0) {
if (ohci->disabled) {
/* FIXME: Something like this should kick in,
* though it's currently an exotic case ...
* the controller won't ever be touching
* these lists again!!
dl_del_list (ohci,
le16_to_cpu (ohci->hcca->frame_no) & 1);
*/
warn ("TD leak, %d", cnt);
} else if (!in_interrupt ()) {
DECLARE_WAIT_QUEUE_HEAD (freedev_wakeup);
DECLARE_WAITQUEUE (wait, current);
int timeout = OHCI_UNLINK_TIMEOUT;
/* SF interrupt handler calls dl_del_list */
add_wait_queue (&freedev_wakeup, &wait);
dev->wait = &freedev_wakeup;
set_current_state(TASK_UNINTERRUPTIBLE);
while (timeout && dev->ed_cnt)
timeout = schedule_timeout (timeout);
set_current_state(TASK_RUNNING);
remove_wait_queue (&freedev_wakeup, &wait);
if (dev->ed_cnt) {
err ("free device %d timeout", usb_dev->devnum);
return -ETIMEDOUT;
}
} else {
/* likely some interface's driver has a refcount bug */
err ("bus %s devnum %d deletion in interrupt",
ohci->ohci_dev->slot_name, usb_dev->devnum);
BUG ();
}
}
}
/* free device, and associated EDs */
dev_free (ohci, dev);
return 0;
}
/*-------------------------------------------------------------------------*/
/* tell us the current USB frame number */
static int sohci_get_current_frame_number (struct usb_device *usb_dev)
{
ohci_t * ohci = usb_dev->bus->hcpriv;
return le16_to_cpu (ohci->hcca->frame_no);
}
/*-------------------------------------------------------------------------*/
struct usb_operations sohci_device_operations = {
sohci_alloc_dev,
sohci_free_dev,
sohci_get_current_frame_number,
sohci_submit_urb,
sohci_unlink_urb
};
/*-------------------------------------------------------------------------*
* ED handling functions
*-------------------------------------------------------------------------*/
/* search for the right branch to insert an interrupt ed into the int tree
* do some load ballancing;
* returns the branch and
* sets the interval to interval = 2^integer (ld (interval)) */
static int ep_int_ballance (ohci_t * ohci, int interval, int load)
{
int i, branch = 0;
/* search for the least loaded interrupt endpoint branch of all 32 branches */
for (i = 0; i < 32; i++)
if (ohci->ohci_int_load [branch] > ohci->ohci_int_load [i]) branch = i;
branch = branch % interval;
for (i = branch; i < 32; i += interval) ohci->ohci_int_load [i] += load;
return branch;
}
/*-------------------------------------------------------------------------*/
/* 2^int( ld (inter)) */
static int ep_2_n_interval (int inter)
{
int i;
for (i = 0; ((inter >> i) > 1 ) && (i < 5); i++);
return 1 << i;
}
/*-------------------------------------------------------------------------*/
/* the int tree is a binary tree
* in order to process it sequentially the indexes of the branches have to be mapped
* the mapping reverses the bits of a word of num_bits length */
static int ep_rev (int num_bits, int word)
{
int i, wout = 0;
for (i = 0; i < num_bits; i++) wout |= (((word >> i) & 1) << (num_bits - i - 1));
return wout;
}
/*-------------------------------------------------------------------------*/
/* link an ed into one of the HC chains */
static int ep_link (ohci_t * ohci, ed_t * edi)
{
int int_branch;
int i;
int inter;
int interval;
int load;
__u32 * ed_p;
volatile ed_t * ed = edi;
ed->state = ED_OPER;
switch (ed->type) {
case PIPE_CONTROL:
ed->hwNextED = 0;
if (ohci->ed_controltail == NULL) {
writel (ed->dma, &ohci->regs->ed_controlhead);
} else {
ohci->ed_controltail->hwNextED = cpu_to_le32 (ed->dma);
}
ed->ed_prev = ohci->ed_controltail;
if (!ohci->ed_controltail && !ohci->ed_rm_list[0] &&
!ohci->ed_rm_list[1] && !ohci->sleeping) {
ohci->hc_control |= OHCI_CTRL_CLE;
writel (ohci->hc_control, &ohci->regs->control);
}
ohci->ed_controltail = edi;
break;
case PIPE_BULK:
ed->hwNextED = 0;
if (ohci->ed_bulktail == NULL) {
writel (ed->dma, &ohci->regs->ed_bulkhead);
} else {
ohci->ed_bulktail->hwNextED = cpu_to_le32 (ed->dma);
}
ed->ed_prev = ohci->ed_bulktail;
if (!ohci->ed_bulktail && !ohci->ed_rm_list[0] &&
!ohci->ed_rm_list[1] && !ohci->sleeping) {
ohci->hc_control |= OHCI_CTRL_BLE;
writel (ohci->hc_control, &ohci->regs->control);
}
ohci->ed_bulktail = edi;
break;
case PIPE_INTERRUPT:
load = ed->int_load;
interval = ep_2_n_interval (ed->int_period);
ed->int_interval = interval;
int_branch = ep_int_ballance (ohci, interval, load);
ed->int_branch = int_branch;
for (i = 0; i < ep_rev (6, interval); i += inter) {
inter = 1;
for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i) + int_branch]);
(*ed_p != 0) && ((dma_to_ed (ohci, le32_to_cpup (ed_p)))->int_interval >= interval);
ed_p = &((dma_to_ed (ohci, le32_to_cpup (ed_p)))->hwNextED))
inter = ep_rev (6, (dma_to_ed (ohci, le32_to_cpup (ed_p)))->int_interval);
ed->hwNextED = *ed_p;
*ed_p = cpu_to_le32 (ed->dma);
}
#ifdef DEBUG
ep_print_int_eds (ohci, "LINK_INT");
#endif
break;
case PIPE_ISOCHRONOUS:
ed->hwNextED = 0;
ed->int_interval = 1;
if (ohci->ed_isotail != NULL) {
ohci->ed_isotail->hwNextED = cpu_to_le32 (ed->dma);
ed->ed_prev = ohci->ed_isotail;
} else {
for ( i = 0; i < 32; i += inter) {
inter = 1;
for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i)]);
*ed_p != 0;
ed_p = &((dma_to_ed (ohci, le32_to_cpup (ed_p)))->hwNextED))
inter = ep_rev (6, (dma_to_ed (ohci, le32_to_cpup (ed_p)))->int_interval);
*ed_p = cpu_to_le32 (ed->dma);
}
ed->ed_prev = NULL;
}
ohci->ed_isotail = edi;
#ifdef DEBUG
ep_print_int_eds (ohci, "LINK_ISO");
#endif
break;
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* unlink an ed from one of the HC chains.
* just the link to the ed is unlinked.
* the link from the ed still points to another operational ed or 0
* so the HC can eventually finish the processing of the unlinked ed */
static int ep_unlink (ohci_t * ohci, ed_t * ed)
{
int int_branch;
int i;
int inter;
int interval;
__u32 * ed_p;
ed->hwINFO |= cpu_to_le32 (OHCI_ED_SKIP);
switch (ed->type) {
case PIPE_CONTROL:
if (ed->ed_prev == NULL) {
if (!ed->hwNextED) {
ohci->hc_control &= ~OHCI_CTRL_CLE;
writel (ohci->hc_control, &ohci->regs->control);
}
writel (le32_to_cpup (&ed->hwNextED), &ohci->regs->ed_controlhead);
} else {
ed->ed_prev->hwNextED = ed->hwNextED;
}
if (ohci->ed_controltail == ed) {
ohci->ed_controltail = ed->ed_prev;
} else {
(dma_to_ed (ohci, le32_to_cpup (&ed->hwNextED)))->ed_prev = ed->ed_prev;
}
break;
case PIPE_BULK:
if (ed->ed_prev == NULL) {
if (!ed->hwNextED) {
ohci->hc_control &= ~OHCI_CTRL_BLE;
writel (ohci->hc_control, &ohci->regs->control);
}
writel (le32_to_cpup (&ed->hwNextED), &ohci->regs->ed_bulkhead);
} else {
ed->ed_prev->hwNextED = ed->hwNextED;
}
if (ohci->ed_bulktail == ed) {
ohci->ed_bulktail = ed->ed_prev;
} else {
(dma_to_ed (ohci, le32_to_cpup (&ed->hwNextED)))->ed_prev = ed->ed_prev;
}
break;
case PIPE_INTERRUPT:
int_branch = ed->int_branch;
interval = ed->int_interval;
for (i = 0; i < ep_rev (6, interval); i += inter) {
for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i) + int_branch]), inter = 1;
(*ed_p != 0) && (*ed_p != ed->hwNextED);
ed_p = &((dma_to_ed (ohci, le32_to_cpup (ed_p)))->hwNextED),
inter = ep_rev (6, (dma_to_ed (ohci, le32_to_cpup (ed_p)))->int_interval)) {
if((dma_to_ed (ohci, le32_to_cpup (ed_p))) == ed) {
*ed_p = ed->hwNextED;
break;
}
}
}
for (i = int_branch; i < 32; i += interval)
ohci->ohci_int_load[i] -= ed->int_load;
#ifdef DEBUG
ep_print_int_eds (ohci, "UNLINK_INT");
#endif
break;
case PIPE_ISOCHRONOUS:
if (ohci->ed_isotail == ed)
ohci->ed_isotail = ed->ed_prev;
if (ed->hwNextED != 0)
(dma_to_ed (ohci, le32_to_cpup (&ed->hwNextED)))->ed_prev = ed->ed_prev;
if (ed->ed_prev != NULL) {
ed->ed_prev->hwNextED = ed->hwNextED;
} else {
for (i = 0; i < 32; i++) {
for (ed_p = &(ohci->hcca->int_table[ep_rev (5, i)]);
*ed_p != 0;
ed_p = &((dma_to_ed (ohci, le32_to_cpup (ed_p)))->hwNextED)) {
// inter = ep_rev (6, (dma_to_ed (ohci, le32_to_cpup (ed_p)))->int_interval);
if((dma_to_ed (ohci, le32_to_cpup (ed_p))) == ed) {
*ed_p = ed->hwNextED;
break;
}
}
}
}
#ifdef DEBUG
ep_print_int_eds (ohci, "UNLINK_ISO");
#endif
break;
}
ed->state = ED_UNLINK;
return 0;
}
/*-------------------------------------------------------------------------*/
/* add/reinit an endpoint; this should be done once at the usb_set_configuration command,
* but the USB stack is a little bit stateless so we do it at every transaction
* if the state of the ed is ED_NEW then a dummy td is added and the state is changed to ED_UNLINK
* in all other cases the state is left unchanged
* the ed info fields are setted anyway even though most of them should not change */
static ed_t * ep_add_ed (
struct usb_device * usb_dev,
unsigned int pipe,
int interval,
int load,
int mem_flags
)
{
ohci_t * ohci = usb_dev->bus->hcpriv;
td_t * td;
ed_t * ed_ret;
volatile ed_t * ed;
unsigned long flags;
spin_lock_irqsave (&usb_ed_lock, flags);
ed = ed_ret = &(usb_to_ohci (usb_dev)->ed[(usb_pipeendpoint (pipe) << 1) |
(usb_pipecontrol (pipe)? 0: usb_pipeout (pipe))]);
if ((ed->state & ED_DEL) || (ed->state & ED_URB_DEL)) {
/* pending delete request */
spin_unlock_irqrestore (&usb_ed_lock, flags);
return NULL;
}
if (ed->state == ED_NEW) {
ed->hwINFO = cpu_to_le32 (OHCI_ED_SKIP); /* skip ed */
/* dummy td; end of td list for ed */
td = td_alloc (ohci, SLAB_ATOMIC);
/* hash the ed for later reverse mapping */
if (!td || !hash_add_ed (ohci, (ed_t *)ed)) {
/* out of memory */
if (td)
td_free(ohci, td);
spin_unlock_irqrestore (&usb_ed_lock, flags);
return NULL;
}
ed->hwTailP = cpu_to_le32 (td->td_dma);
ed->hwHeadP = ed->hwTailP;
ed->state = ED_UNLINK;
ed->type = usb_pipetype (pipe);
usb_to_ohci (usb_dev)->ed_cnt++;
}
ohci->dev[usb_pipedevice (pipe)] = usb_dev;
ed->hwINFO = cpu_to_le32 (usb_pipedevice (pipe)
| usb_pipeendpoint (pipe) << 7
| (usb_pipeisoc (pipe)? 0x8000: 0)
| (usb_pipecontrol (pipe)? 0: (usb_pipeout (pipe)? 0x800: 0x1000))
| usb_pipeslow (pipe) << 13
| usb_maxpacket (usb_dev, pipe, usb_pipeout (pipe)) << 16);
if (ed->type == PIPE_INTERRUPT && ed->state == ED_UNLINK) {
ed->int_period = interval;
ed->int_load = load;
}
spin_unlock_irqrestore (&usb_ed_lock, flags);
return ed_ret;
}
/*-------------------------------------------------------------------------*/
/* request the removal of an endpoint
* put the ep on the rm_list and request a stop of the bulk or ctrl list
* real removal is done at the next start frame (SF) hardware interrupt */
static void ep_rm_ed (struct usb_device * usb_dev, ed_t * ed)
{
unsigned int frame;
ohci_t * ohci = usb_dev->bus->hcpriv;
if ((ed->state & ED_DEL) || (ed->state & ED_URB_DEL))
return;
ed->hwINFO |= cpu_to_le32 (OHCI_ED_SKIP);
if (!ohci->disabled) {
switch (ed->type) {
case PIPE_CONTROL: /* stop control list */
ohci->hc_control &= ~OHCI_CTRL_CLE;
writel (ohci->hc_control, &ohci->regs->control);
break;
case PIPE_BULK: /* stop bulk list */
ohci->hc_control &= ~OHCI_CTRL_BLE;
writel (ohci->hc_control, &ohci->regs->control);
break;
}
}
frame = le16_to_cpu (ohci->hcca->frame_no) & 0x1;
ed->ed_rm_list = ohci->ed_rm_list[frame];
ohci->ed_rm_list[frame] = ed;
if (!ohci->disabled && !ohci->sleeping) {
/* enable SOF interrupt */
writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
writel (OHCI_INTR_SF, &ohci->regs->intrenable);
}
}
/*-------------------------------------------------------------------------*
* TD handling functions
*-------------------------------------------------------------------------*/
/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */
static void
td_fill (ohci_t * ohci, unsigned int info,
dma_addr_t data, int len,
urb_t * urb, int index)
{
volatile td_t * td, * td_pt;
urb_priv_t * urb_priv = urb->hcpriv;
if (index >= urb_priv->length) {
err("internal OHCI error: TD index > length");
return;
}
/* use this td as the next dummy */
td_pt = urb_priv->td [index];
td_pt->hwNextTD = 0;
/* fill the old dummy TD */
td = urb_priv->td [index] = dma_to_td (ohci,
le32_to_cpup (&urb_priv->ed->hwTailP) & ~0xf);
td->ed = urb_priv->ed;
td->next_dl_td = NULL;
td->index = index;
td->urb = urb;
td->data_dma = data;
if (!len)
data = 0;
td->hwINFO = cpu_to_le32 (info);
if ((td->ed->type) == PIPE_ISOCHRONOUS) {
td->hwCBP = cpu_to_le32 (data & 0xFFFFF000);
td->ed->last_iso = info & 0xffff;
} else {
td->hwCBP = cpu_to_le32 (data);
}
if (data)
td->hwBE = cpu_to_le32 (data + len - 1);
else
td->hwBE = 0;
td->hwNextTD = cpu_to_le32 (td_pt->td_dma);
td->hwPSW [0] = cpu_to_le16 ((data & 0x0FFF) | 0xE000);
/* append to queue */
td->ed->hwTailP = td->hwNextTD;
}
/*-------------------------------------------------------------------------*/
/* prepare all TDs of a transfer */
static void td_submit_urb (urb_t * urb)
{
urb_priv_t * urb_priv = urb->hcpriv;
ohci_t * ohci = (ohci_t *) urb->dev->bus->hcpriv;
dma_addr_t data;
int data_len = urb->transfer_buffer_length;
int maxps = usb_maxpacket (urb->dev, urb->pipe, usb_pipeout (urb->pipe));
int cnt = 0;
__u32 info = 0;
unsigned int toggle = 0;
/* OHCI handles the DATA-toggles itself, we just use the USB-toggle bits for reseting */
if(usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe))) {
toggle = TD_T_TOGGLE;
} else {
toggle = TD_T_DATA0;
usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe), 1);
}
urb_priv->td_cnt = 0;
if (data_len) {
data = pci_map_single (ohci->ohci_dev,
urb->transfer_buffer, data_len,
usb_pipeout (urb->pipe)
? PCI_DMA_TODEVICE
: PCI_DMA_FROMDEVICE
);
} else
data = 0;
switch (usb_pipetype (urb->pipe)) {
case PIPE_BULK:
info = usb_pipeout (urb->pipe)?
TD_CC | TD_DP_OUT : TD_CC | TD_DP_IN ;
while(data_len > 4096) {
td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, 4096, urb, cnt);
data += 4096; data_len -= 4096; cnt++;
}
info = usb_pipeout (urb->pipe)?
TD_CC | TD_DP_OUT : TD_CC | TD_R | TD_DP_IN ;
td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, data_len, urb, cnt);
cnt++;
/* If the transfer size is multiple of the pipe mtu,
* we may need an extra TD to create a empty frame
* Note : another way to check this condition is
* to test if(urb_priv->length > cnt) - Jean II */
if ((urb->transfer_flags & USB_ZERO_PACKET) &&
usb_pipeout (urb->pipe) &&
(urb->transfer_buffer_length != 0) &&
((urb->transfer_buffer_length % maxps) == 0)) {
td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), 0, 0, urb, cnt);
cnt++;
}
if (!ohci->sleeping)
writel (OHCI_BLF, &ohci->regs->cmdstatus); /* start bulk list */
break;
case PIPE_INTERRUPT:
info = usb_pipeout (urb->pipe)?
TD_CC | TD_DP_OUT | toggle: TD_CC | TD_R | TD_DP_IN | toggle;
td_fill (ohci, info, data, data_len, urb, cnt++);
break;
case PIPE_CONTROL:
info = TD_CC | TD_DP_SETUP | TD_T_DATA0;
td_fill (ohci, info,
pci_map_single (ohci->ohci_dev,
urb->setup_packet, 8,
PCI_DMA_TODEVICE),
8, urb, cnt++);
if (data_len > 0) {
info = usb_pipeout (urb->pipe)?
TD_CC | TD_R | TD_DP_OUT | TD_T_DATA1 : TD_CC | TD_R | TD_DP_IN | TD_T_DATA1;
/* NOTE: mishandles transfers >8K, some >4K */
td_fill (ohci, info, data, data_len, urb, cnt++);
}
info = usb_pipeout (urb->pipe)?
TD_CC | TD_DP_IN | TD_T_DATA1: TD_CC | TD_DP_OUT | TD_T_DATA1;
td_fill (ohci, info, data, 0, urb, cnt++);
if (!ohci->sleeping)
writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */
break;
case PIPE_ISOCHRONOUS:
for (cnt = 0; cnt < urb->number_of_packets; cnt++) {
td_fill (ohci, TD_CC|TD_ISO | ((urb->start_frame + cnt) & 0xffff),
data + urb->iso_frame_desc[cnt].offset,
urb->iso_frame_desc[cnt].length, urb, cnt);
}
break;
}
if (urb_priv->length != cnt)
dbg("TD LENGTH %d != CNT %d", urb_priv->length, cnt);
}
/*-------------------------------------------------------------------------*
* Done List handling functions
*-------------------------------------------------------------------------*/
/* calculate the transfer length and update the urb */
static void dl_transfer_length(td_t * td)
{
__u32 tdINFO, tdBE, tdCBP;
__u16 tdPSW;
urb_t * urb = td->urb;
urb_priv_t * urb_priv = urb->hcpriv;
int dlen = 0;
int cc = 0;
tdINFO = le32_to_cpup (&td->hwINFO);
tdBE = le32_to_cpup (&td->hwBE);
tdCBP = le32_to_cpup (&td->hwCBP);
if (tdINFO & TD_ISO) {
tdPSW = le16_to_cpu (td->hwPSW[0]);
cc = (tdPSW >> 12) & 0xF;
if (cc < 0xE) {
if (usb_pipeout(urb->pipe)) {
dlen = urb->iso_frame_desc[td->index].length;
} else {
dlen = tdPSW & 0x3ff;
}
urb->actual_length += dlen;
urb->iso_frame_desc[td->index].actual_length = dlen;
if (!(urb->transfer_flags & USB_DISABLE_SPD) && (cc == TD_DATAUNDERRUN))
cc = TD_CC_NOERROR;
urb->iso_frame_desc[td->index].status = cc_to_error[cc];
}
} else { /* BULK, INT, CONTROL DATA */
if (!(usb_pipetype (urb->pipe) == PIPE_CONTROL &&
((td->index == 0) || (td->index == urb_priv->length - 1)))) {
if (tdBE != 0) {
if (td->hwCBP == 0)
urb->actual_length += tdBE - td->data_dma + 1;
else
urb->actual_length += tdCBP - td->data_dma;
}
}
}
}
/* handle an urb that is being unlinked */
static void dl_del_urb (urb_t * urb)
{
wait_queue_head_t * wait_head = ((urb_priv_t *)(urb->hcpriv))->wait;
urb_rm_priv_locked (urb);
if (urb->transfer_flags & USB_ASYNC_UNLINK) {
urb->status = -ECONNRESET;
if (urb->complete)
urb->complete (urb);
} else {
urb->status = -ENOENT;
/* unblock sohci_unlink_urb */
if (wait_head)
wake_up (wait_head);
}
}
/*-------------------------------------------------------------------------*/
/* replies to the request have to be on a FIFO basis so
* we reverse the reversed done-list */
static td_t * dl_reverse_done_list (ohci_t * ohci)
{
__u32 td_list_hc;
td_t * td_rev = NULL;
td_t * td_list = NULL;
urb_priv_t * urb_priv = NULL;
unsigned long flags;
spin_lock_irqsave (&usb_ed_lock, flags);
td_list_hc = le32_to_cpup (&ohci->hcca->done_head) & 0xfffffff0;
ohci->hcca->done_head = 0;
while (td_list_hc) {
td_list = dma_to_td (ohci, td_list_hc);
if (TD_CC_GET (le32_to_cpup (&td_list->hwINFO))) {
urb_priv = (urb_priv_t *) td_list->urb->hcpriv;
dbg(" USB-error/status: %x : %p",
TD_CC_GET (le32_to_cpup (&td_list->hwINFO)), td_list);
if (td_list->ed->hwHeadP & cpu_to_le32 (0x1)) {
if (urb_priv && ((td_list->index + 1) < urb_priv->length)) {
td_list->ed->hwHeadP =
(urb_priv->td[urb_priv->length - 1]->hwNextTD & cpu_to_le32 (0xfffffff0)) |
(td_list->ed->hwHeadP & cpu_to_le32 (0x2));
urb_priv->td_cnt += urb_priv->length - td_list->index - 1;
} else
td_list->ed->hwHeadP &= cpu_to_le32 (0xfffffff2);
}
}
td_list->next_dl_td = td_rev;
td_rev = td_list;
td_list_hc = le32_to_cpup (&td_list->hwNextTD) & 0xfffffff0;
}
spin_unlock_irqrestore (&usb_ed_lock, flags);
return td_list;
}
/*-------------------------------------------------------------------------*/
/* there are some pending requests to remove
* - some of the eds (if ed->state & ED_DEL (set by sohci_free_dev)
* - some URBs/TDs if urb_priv->state == URB_DEL */
static void dl_del_list (ohci_t * ohci, unsigned int frame)
{
unsigned long flags;
ed_t * ed;
__u32 edINFO;
__u32 tdINFO;
td_t * td = NULL, * td_next = NULL, * tdHeadP = NULL, * tdTailP;
__u32 * td_p;
int ctrl = 0, bulk = 0;
spin_lock_irqsave (&usb_ed_lock, flags);
for (ed = ohci->ed_rm_list[frame]; ed != NULL; ed = ed->ed_rm_list) {
tdTailP = dma_to_td (ohci, le32_to_cpup (&ed->hwTailP) & 0xfffffff0);
tdHeadP = dma_to_td (ohci, le32_to_cpup (&ed->hwHeadP) & 0xfffffff0);
edINFO = le32_to_cpup (&ed->hwINFO);
td_p = &ed->hwHeadP;
for (td = tdHeadP; td != tdTailP; td = td_next) {
urb_t * urb = td->urb;
urb_priv_t * urb_priv = td->urb->hcpriv;
td_next = dma_to_td (ohci, le32_to_cpup (&td->hwNextTD) & 0xfffffff0);
if ((urb_priv->state == URB_DEL) || (ed->state & ED_DEL)) {
tdINFO = le32_to_cpup (&td->hwINFO);
if (TD_CC_GET (tdINFO) < 0xE)
dl_transfer_length (td);
*td_p = td->hwNextTD | (*td_p & cpu_to_le32 (0x3));
/* URB is done; clean up */
if (++(urb_priv->td_cnt) == urb_priv->length)
dl_del_urb (urb);
} else {
td_p = &td->hwNextTD;
}
}
if (ed->state & ED_DEL) { /* set by sohci_free_dev */
struct ohci_device * dev = usb_to_ohci (ohci->dev[edINFO & 0x7F]);
td_free (ohci, tdTailP); /* free dummy td */
ed->hwINFO = cpu_to_le32 (OHCI_ED_SKIP);
ed->state = ED_NEW;
hash_free_ed(ohci, ed);
/* if all eds are removed wake up sohci_free_dev */
if (!--dev->ed_cnt) {
wait_queue_head_t *wait_head = dev->wait;
dev->wait = 0;
if (wait_head)
wake_up (wait_head);
}
} else {
ed->state &= ~ED_URB_DEL;
tdHeadP = dma_to_td (ohci, le32_to_cpup (&ed->hwHeadP) & 0xfffffff0);
if (tdHeadP == tdTailP) {
if (ed->state == ED_OPER)
ep_unlink(ohci, ed);
td_free (ohci, tdTailP);
ed->hwINFO = cpu_to_le32 (OHCI_ED_SKIP);
ed->state = ED_NEW;
hash_free_ed(ohci, ed);
--(usb_to_ohci (ohci->dev[edINFO & 0x7F]))->ed_cnt;
} else
ed->hwINFO &= ~cpu_to_le32 (OHCI_ED_SKIP);
}
switch (ed->type) {
case PIPE_CONTROL:
ctrl = 1;
break;
case PIPE_BULK:
bulk = 1;
break;
}
}
/* maybe reenable control and bulk lists */
if (!ohci->disabled) {
if (ctrl) /* reset control list */
writel (0, &ohci->regs->ed_controlcurrent);
if (bulk) /* reset bulk list */
writel (0, &ohci->regs->ed_bulkcurrent);
if (!ohci->ed_rm_list[!frame] && !ohci->sleeping) {
if (ohci->ed_controltail)
ohci->hc_control |= OHCI_CTRL_CLE;
if (ohci->ed_bulktail)
ohci->hc_control |= OHCI_CTRL_BLE;
writel (ohci->hc_control, &ohci->regs->control);
}
}
ohci->ed_rm_list[frame] = NULL;
spin_unlock_irqrestore (&usb_ed_lock, flags);
}
/*-------------------------------------------------------------------------*/
/* td done list */
static void dl_done_list (ohci_t * ohci, td_t * td_list)
{
td_t * td_list_next = NULL;
ed_t * ed;
int cc = 0;
urb_t * urb;
urb_priv_t * urb_priv;
__u32 tdINFO, edHeadP, edTailP;
unsigned long flags;
while (td_list) {
td_list_next = td_list->next_dl_td;
urb = td_list->urb;
urb_priv = urb->hcpriv;
tdINFO = le32_to_cpup (&td_list->hwINFO);
ed = td_list->ed;
dl_transfer_length(td_list);
/* error code of transfer */
cc = TD_CC_GET (tdINFO);
if (cc == TD_CC_STALL)
usb_endpoint_halt(urb->dev,
usb_pipeendpoint(urb->pipe),
usb_pipeout(urb->pipe));
if (!(urb->transfer_flags & USB_DISABLE_SPD)
&& (cc == TD_DATAUNDERRUN))
cc = TD_CC_NOERROR;
if (++(urb_priv->td_cnt) == urb_priv->length) {
if ((ed->state & (ED_OPER | ED_UNLINK))
&& (urb_priv->state != URB_DEL)) {
urb->status = cc_to_error[cc];
sohci_return_urb (ohci, urb);
} else {
spin_lock_irqsave (&usb_ed_lock, flags);
dl_del_urb (urb);
spin_unlock_irqrestore (&usb_ed_lock, flags);
}
}
spin_lock_irqsave (&usb_ed_lock, flags);
if (ed->state != ED_NEW) {
edHeadP = le32_to_cpup (&ed->hwHeadP) & 0xfffffff0;
edTailP = le32_to_cpup (&ed->hwTailP);
/* unlink eds if they are not busy */
if ((edHeadP == edTailP) && (ed->state == ED_OPER))
ep_unlink (ohci, ed);
}
spin_unlock_irqrestore (&usb_ed_lock, flags);
td_list = td_list_next;
}
}
/*-------------------------------------------------------------------------*
* Virtual Root Hub
*-------------------------------------------------------------------------*/
/* Device descriptor */
static __u8 root_hub_dev_des[] =
{
0x12, /* __u8 bLength; */
0x01, /* __u8 bDescriptorType; Device */
0x10, /* __u16 bcdUSB; v1.1 */
0x01,
0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
0x00, /* __u8 bDeviceSubClass; */
0x00, /* __u8 bDeviceProtocol; */
0x08, /* __u8 bMaxPacketSize0; 8 Bytes */
0x00, /* __u16 idVendor; */
0x00,
0x00, /* __u16 idProduct; */
0x00,
0x00, /* __u16 bcdDevice; */
0x00,
0x00, /* __u8 iManufacturer; */
0x02, /* __u8 iProduct; */
0x01, /* __u8 iSerialNumber; */
0x01 /* __u8 bNumConfigurations; */
};
/* Configuration descriptor */
static __u8 root_hub_config_des[] =
{
0x09, /* __u8 bLength; */
0x02, /* __u8 bDescriptorType; Configuration */
0x19, /* __u16 wTotalLength; */
0x00,
0x01, /* __u8 bNumInterfaces; */
0x01, /* __u8 bConfigurationValue; */
0x00, /* __u8 iConfiguration; */
0x40, /* __u8 bmAttributes;
Bit 7: Bus-powered, 6: Self-powered, 5 Remote-wakwup, 4..0: resvd */
0x00, /* __u8 MaxPower; */
/* interface */
0x09, /* __u8 if_bLength; */
0x04, /* __u8 if_bDescriptorType; Interface */
0x00, /* __u8 if_bInterfaceNumber; */
0x00, /* __u8 if_bAlternateSetting; */
0x01, /* __u8 if_bNumEndpoints; */
0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
0x00, /* __u8 if_bInterfaceSubClass; */
0x00, /* __u8 if_bInterfaceProtocol; */
0x00, /* __u8 if_iInterface; */
/* endpoint */
0x07, /* __u8 ep_bLength; */
0x05, /* __u8 ep_bDescriptorType; Endpoint */
0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
0x03, /* __u8 ep_bmAttributes; Interrupt */
0x02, /* __u16 ep_wMaxPacketSize; ((MAX_ROOT_PORTS + 1) / 8 */
0x00,
0xff /* __u8 ep_bInterval; 255 ms */
};
/* Hub class-specific descriptor is constructed dynamically */
/*-------------------------------------------------------------------------*/
/* prepare Interrupt pipe data; HUB INTERRUPT ENDPOINT */
static int rh_send_irq (ohci_t * ohci, void * rh_data, int rh_len)
{
int num_ports;
int i;
int ret;
int len;
__u8 data[8];
num_ports = roothub_a (ohci) & RH_A_NDP;
if (num_ports > MAX_ROOT_PORTS) {
err ("bogus NDP=%d for OHCI usb-%s", num_ports,
ohci->ohci_dev->slot_name);
err ("rereads as NDP=%d",
readl (&ohci->regs->roothub.a) & RH_A_NDP);
/* retry later; "should not happen" */
return 0;
}
*(__u8 *) data = (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
? 1: 0;
ret = *(__u8 *) data;
for ( i = 0; i < num_ports; i++) {
*(__u8 *) (data + (i + 1) / 8) |=
((roothub_portstatus (ohci, i) &
(RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC | RH_PS_OCIC | RH_PS_PRSC))
? 1: 0) << ((i + 1) % 8);
ret += *(__u8 *) (data + (i + 1) / 8);
}
len = i/8 + 1;
if (ret > 0) {
memcpy(rh_data, data,
min_t(unsigned int, len,
min_t(unsigned int, rh_len, sizeof(data))));
return len;
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* Virtual Root Hub INTs are polled by this timer every "interval" ms */
static void rh_int_timer_do (unsigned long ptr)
{
int len;
urb_t * urb = (urb_t *) ptr;
ohci_t * ohci = urb->dev->bus->hcpriv;
if (ohci->disabled)
return;
/* ignore timers firing during PM suspend, etc */
if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER)
goto out;
if(ohci->rh.send) {
len = rh_send_irq (ohci, urb->transfer_buffer, urb->transfer_buffer_length);
if (len > 0) {
urb->actual_length = len;
#ifdef DEBUG
urb_print (urb, "RET-t(rh)", usb_pipeout (urb->pipe));
#endif
if (urb->complete)
urb->complete (urb);
}
}
out:
rh_init_int_timer (urb);
}
/*-------------------------------------------------------------------------*/
/* Root Hub INTs are polled by this timer */
static int rh_init_int_timer (urb_t * urb)
{
ohci_t * ohci = urb->dev->bus->hcpriv;
ohci->rh.interval = urb->interval;
init_timer (&ohci->rh.rh_int_timer);
ohci->rh.rh_int_timer.function = rh_int_timer_do;
ohci->rh.rh_int_timer.data = (unsigned long) urb;
ohci->rh.rh_int_timer.expires =
jiffies + (HZ * (urb->interval < 30? 30: urb->interval)) / 1000;
add_timer (&ohci->rh.rh_int_timer);
return 0;
}
/*-------------------------------------------------------------------------*/
#define OK(x) len = (x); break
#define WR_RH_STAT(x) writel((x), &ohci->regs->roothub.status)
#define WR_RH_PORTSTAT(x) writel((x), &ohci->regs->roothub.portstatus[wIndex-1])
#define RD_RH_STAT roothub_status(ohci)
#define RD_RH_PORTSTAT roothub_portstatus(ohci,wIndex-1)
/* request to virtual root hub */
static int rh_submit_urb (urb_t * urb)
{
struct usb_device * usb_dev = urb->dev;
ohci_t * ohci = usb_dev->bus->hcpriv;
unsigned int pipe = urb->pipe;
devrequest * cmd = (devrequest *) urb->setup_packet;
void * data = urb->transfer_buffer;
int leni = urb->transfer_buffer_length;
int len = 0;
int status = TD_CC_NOERROR;
__u32 datab[4];
__u8 * data_buf = (__u8 *) datab;
__u16 bmRType_bReq;
__u16 wValue;
__u16 wIndex;
__u16 wLength;
if (usb_pipeint(pipe)) {
ohci->rh.urb = urb;
ohci->rh.send = 1;
ohci->rh.interval = urb->interval;
rh_init_int_timer(urb);
urb->status = cc_to_error [TD_CC_NOERROR];
return 0;
}
bmRType_bReq = cmd->requesttype | (cmd->request << 8);
wValue = le16_to_cpu (cmd->value);
wIndex = le16_to_cpu (cmd->index);
wLength = le16_to_cpu (cmd->length);
switch (bmRType_bReq) {
/* Request Destination:
without flags: Device,
RH_INTERFACE: interface,
RH_ENDPOINT: endpoint,
RH_CLASS means HUB here,
RH_OTHER | RH_CLASS almost ever means HUB_PORT here
*/
case RH_GET_STATUS:
*(__u16 *) data_buf = cpu_to_le16 (1); OK (2);
case RH_GET_STATUS | RH_INTERFACE:
*(__u16 *) data_buf = cpu_to_le16 (0); OK (2);
case RH_GET_STATUS | RH_ENDPOINT:
*(__u16 *) data_buf = cpu_to_le16 (0); OK (2);
case RH_GET_STATUS | RH_CLASS:
*(__u32 *) data_buf = cpu_to_le32 (
RD_RH_STAT & ~(RH_HS_CRWE | RH_HS_DRWE));
OK (4);
case RH_GET_STATUS | RH_OTHER | RH_CLASS:
*(__u32 *) data_buf = cpu_to_le32 (RD_RH_PORTSTAT); OK (4);
case RH_CLEAR_FEATURE | RH_ENDPOINT:
switch (wValue) {
case (RH_ENDPOINT_STALL): OK (0);
}
break;
case RH_CLEAR_FEATURE | RH_CLASS:
switch (wValue) {
case RH_C_HUB_LOCAL_POWER:
OK(0);
case (RH_C_HUB_OVER_CURRENT):
WR_RH_STAT(RH_HS_OCIC); OK (0);
}
break;
case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
switch (wValue) {
case (RH_PORT_ENABLE):
WR_RH_PORTSTAT (RH_PS_CCS ); OK (0);
case (RH_PORT_SUSPEND):
WR_RH_PORTSTAT (RH_PS_POCI); OK (0);
case (RH_PORT_POWER):
WR_RH_PORTSTAT (RH_PS_LSDA); OK (0);
case (RH_C_PORT_CONNECTION):
WR_RH_PORTSTAT (RH_PS_CSC ); OK (0);
case (RH_C_PORT_ENABLE):
WR_RH_PORTSTAT (RH_PS_PESC); OK (0);
case (RH_C_PORT_SUSPEND):
WR_RH_PORTSTAT (RH_PS_PSSC); OK (0);
case (RH_C_PORT_OVER_CURRENT):
WR_RH_PORTSTAT (RH_PS_OCIC); OK (0);
case (RH_C_PORT_RESET):
WR_RH_PORTSTAT (RH_PS_PRSC); OK (0);
}
break;
case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
switch (wValue) {
case (RH_PORT_SUSPEND):
WR_RH_PORTSTAT (RH_PS_PSS ); OK (0);
case (RH_PORT_RESET): /* BUG IN HUP CODE *********/
if (RD_RH_PORTSTAT & RH_PS_CCS)
WR_RH_PORTSTAT (RH_PS_PRS);
OK (0);
case (RH_PORT_POWER):
WR_RH_PORTSTAT (RH_PS_PPS ); OK (0);
case (RH_PORT_ENABLE): /* BUG IN HUP CODE *********/
if (RD_RH_PORTSTAT & RH_PS_CCS)
WR_RH_PORTSTAT (RH_PS_PES );
OK (0);
}
break;
case RH_SET_ADDRESS: ohci->rh.devnum = wValue; OK(0);
case RH_GET_DESCRIPTOR:
switch ((wValue & 0xff00) >> 8) {
case (0x01): /* device descriptor */
len = min_t(unsigned int,
leni,
min_t(unsigned int,
sizeof (root_hub_dev_des),
wLength));
data_buf = root_hub_dev_des; OK(len);
case (0x02): /* configuration descriptor */
len = min_t(unsigned int,
leni,
min_t(unsigned int,
sizeof (root_hub_config_des),
wLength));
data_buf = root_hub_config_des; OK(len);
case (0x03): /* string descriptors */
len = usb_root_hub_string (wValue & 0xff,
(int)(long) ohci->regs, "OHCI",
data, wLength);
if (len > 0) {
data_buf = data;
OK(min_t(int, leni, len));
}
// else fallthrough
default:
status = TD_CC_STALL;
}
break;
case RH_GET_DESCRIPTOR | RH_CLASS:
{
__u32 temp = roothub_a (ohci);
data_buf [0] = 9; // min length;
data_buf [1] = 0x29;
data_buf [2] = temp & RH_A_NDP;
data_buf [3] = 0;
if (temp & RH_A_PSM) /* per-port power switching? */
data_buf [3] |= 0x1;
if (temp & RH_A_NOCP) /* no overcurrent reporting? */
data_buf [3] |= 0x10;
else if (temp & RH_A_OCPM) /* per-port overcurrent reporting? */
data_buf [3] |= 0x8;
datab [1] = 0;
data_buf [5] = (temp & RH_A_POTPGT) >> 24;
temp = roothub_b (ohci);
data_buf [7] = temp & RH_B_DR;
if (data_buf [2] < 7) {
data_buf [8] = 0xff;
} else {
data_buf [0] += 2;
data_buf [8] = (temp & RH_B_DR) >> 8;
data_buf [10] = data_buf [9] = 0xff;
}
len = min_t(unsigned int, leni,
min_t(unsigned int, data_buf [0], wLength));
OK (len);
}
case RH_GET_CONFIGURATION: *(__u8 *) data_buf = 0x01; OK (1);
case RH_SET_CONFIGURATION: WR_RH_STAT (0x10000); OK (0);
default:
dbg ("unsupported root hub command");
status = TD_CC_STALL;
}
#ifdef DEBUG
// ohci_dump_roothub (ohci, 0);
#endif
len = min_t(int, len, leni);
if (data != data_buf)
memcpy (data, data_buf, len);
urb->actual_length = len;
urb->status = cc_to_error [status];
#ifdef DEBUG
urb_print (urb, "RET(rh)", usb_pipeout (urb->pipe));
#endif
urb->hcpriv = NULL;
usb_dec_dev_use (usb_dev);
urb->dev = NULL;
if (urb->complete)
urb->complete (urb);
return 0;
}
/*-------------------------------------------------------------------------*/
static int rh_unlink_urb (urb_t * urb)
{
ohci_t * ohci = urb->dev->bus->hcpriv;
if (ohci->rh.urb == urb) {
ohci->rh.send = 0;
del_timer (&ohci->rh.rh_int_timer);
ohci->rh.urb = NULL;
urb->hcpriv = NULL;
usb_dec_dev_use(urb->dev);
urb->dev = NULL;
if (urb->transfer_flags & USB_ASYNC_UNLINK) {
urb->status = -ECONNRESET;
if (urb->complete)
urb->complete (urb);
} else
urb->status = -ENOENT;
}
return 0;
}
/*-------------------------------------------------------------------------*
* HC functions
*-------------------------------------------------------------------------*/
/* reset the HC and BUS */
static int hc_reset (ohci_t * ohci)
{
int timeout = 30;
int smm_timeout = 50; /* 0,5 sec */
if (readl (&ohci->regs->control) & OHCI_CTRL_IR) { /* SMM owns the HC */
writel (OHCI_OCR, &ohci->regs->cmdstatus); /* request ownership */
dbg("USB HC TakeOver from SMM");
while (readl (&ohci->regs->control) & OHCI_CTRL_IR) {
wait_ms (10);
if (--smm_timeout == 0) {
err("USB HC TakeOver failed!");
return -1;
}
}
}
/* Disable HC interrupts */
writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);
dbg("USB HC reset_hc usb-%s: ctrl = 0x%x ;",
ohci->ohci_dev->slot_name,
readl (&ohci->regs->control));
/* Reset USB (needed by some controllers) */
writel (0, &ohci->regs->control);
/* HC Reset requires max 10 ms delay */
writel (OHCI_HCR, &ohci->regs->cmdstatus);
while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
if (--timeout == 0) {
err("USB HC reset timed out!");
return -1;
}
udelay (1);
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* Start an OHCI controller, set the BUS operational
* enable interrupts
* connect the virtual root hub */
static int hc_start (ohci_t * ohci)
{
__u32 mask;
unsigned int fminterval;
struct usb_device * usb_dev;
struct ohci_device * dev;
ohci->disabled = 1;
/* Tell the controller where the control and bulk lists are
* The lists are empty now. */
writel (0, &ohci->regs->ed_controlhead);
writel (0, &ohci->regs->ed_bulkhead);
writel (ohci->hcca_dma, &ohci->regs->hcca); /* a reset clears this */
fminterval = 0x2edf;
writel ((fminterval * 9) / 10, &ohci->regs->periodicstart);
fminterval |= ((((fminterval - 210) * 6) / 7) << 16);
writel (fminterval, &ohci->regs->fminterval);
writel (0x628, &ohci->regs->lsthresh);
/* start controller operations */
ohci->hc_control = OHCI_CONTROL_INIT | OHCI_USB_OPER;
ohci->disabled = 0;
writel (ohci->hc_control, &ohci->regs->control);
/* Choose the interrupts we care about now, others later on demand */
mask = OHCI_INTR_MIE | OHCI_INTR_UE | OHCI_INTR_WDH | OHCI_INTR_SO;
writel (mask, &ohci->regs->intrenable);
writel (mask, &ohci->regs->intrstatus);
#ifdef OHCI_USE_NPS
/* required for AMD-756 and some Mac platforms */
writel ((roothub_a (ohci) | RH_A_NPS) & ~RH_A_PSM,
&ohci->regs->roothub.a);
writel (RH_HS_LPSC, &ohci->regs->roothub.status);
#endif /* OHCI_USE_NPS */
// POTPGT delay is bits 24-31, in 2 ms units.
mdelay ((roothub_a (ohci) >> 23) & 0x1fe);
/* connect the virtual root hub */
ohci->rh.devnum = 0;
usb_dev = usb_alloc_dev (NULL, ohci->bus);
if (!usb_dev) {
ohci->disabled = 1;
return -ENOMEM;
}
dev = usb_to_ohci (usb_dev);
ohci->bus->root_hub = usb_dev;
usb_connect (usb_dev);
if (usb_new_device (usb_dev) != 0) {
usb_free_dev (usb_dev);
ohci->disabled = 1;
return -ENODEV;
}
return 0;
}
/*-------------------------------------------------------------------------*/
/* called only from interrupt handler */
static void check_timeouts (struct ohci *ohci)
{
spin_lock (&usb_ed_lock);
while (!list_empty (&ohci->timeout_list)) {
struct urb *urb;
urb = list_entry (ohci->timeout_list.next, struct urb, urb_list);
if (time_after (jiffies, urb->timeout))
break;
list_del_init (&urb->urb_list);
if (urb->status != -EINPROGRESS)
continue;
urb->transfer_flags |= USB_TIMEOUT_KILLED | USB_ASYNC_UNLINK;
spin_unlock (&usb_ed_lock);
// outside the interrupt handler (in a timer...)
// this reference would race interrupts
sohci_unlink_urb (urb);
spin_lock (&usb_ed_lock);
}
spin_unlock (&usb_ed_lock);
}
/*-------------------------------------------------------------------------*/
/* an interrupt happens */
static void hc_interrupt (int irq, void * __ohci, struct pt_regs * r)
{
ohci_t * ohci = __ohci;
struct ohci_regs * regs = ohci->regs;
int ints;
if ((ohci->hcca->done_head != 0) && !(le32_to_cpup (&ohci->hcca->done_head) & 0x01)) {
ints = OHCI_INTR_WDH;
} else if ((ints = (readl (®s->intrstatus) & readl (®s->intrenable))) == 0) {
return;
}
// dbg("Interrupt: %x frame: %x", ints, le16_to_cpu (ohci->hcca->frame_no));
if (ints & OHCI_INTR_UE) {
ohci->disabled++;
err ("OHCI Unrecoverable Error, controller usb-%s disabled",
ohci->ohci_dev->slot_name);
// e.g. due to PCI Master/Target Abort
#ifdef DEBUG
ohci_dump (ohci, 1);
#else
// FIXME: be optimistic, hope that bug won't repeat often.
// Make some non-interrupt context restart the controller.
// Count and limit the retries though; either hardware or
// software errors can go forever...
#endif
hc_reset (ohci);
}
if (ints & OHCI_INTR_WDH) {
writel (OHCI_INTR_WDH, ®s->intrdisable);
dl_done_list (ohci, dl_reverse_done_list (ohci));
writel (OHCI_INTR_WDH, ®s->intrenable);
}
if (ints & OHCI_INTR_SO) {
dbg("USB Schedule overrun");
writel (OHCI_INTR_SO, ®s->intrenable);
}
// FIXME: this assumes SOF (1/ms) interrupts don't get lost...
if (ints & OHCI_INTR_SF) {
unsigned int frame = le16_to_cpu (ohci->hcca->frame_no) & 1;
writel (OHCI_INTR_SF, ®s->intrdisable);
if (ohci->ed_rm_list[!frame] != NULL) {
dl_del_list (ohci, !frame);
}
if (ohci->ed_rm_list[frame] != NULL)
writel (OHCI_INTR_SF, ®s->intrenable);
}
if (!list_empty (&ohci->timeout_list)) {
check_timeouts (ohci);
// FIXME: enable SF as needed in a timer;
// don't make lots of 1ms interrupts
// On unloaded USB, think 4k ~= 4-5msec
if (!list_empty (&ohci->timeout_list))
writel (OHCI_INTR_SF, ®s->intrenable);
}
writel (ints, ®s->intrstatus);
writel (OHCI_INTR_MIE, ®s->intrenable);
}
/*-------------------------------------------------------------------------*/
/* allocate OHCI */
static ohci_t * __devinit hc_alloc_ohci (struct pci_dev *dev, void * mem_base)
{
ohci_t * ohci;
struct usb_bus * bus;
ohci = (ohci_t *) kmalloc (sizeof *ohci, GFP_KERNEL);
if (!ohci)
return NULL;
memset (ohci, 0, sizeof (ohci_t));
ohci->hcca = pci_alloc_consistent (dev, sizeof *ohci->hcca,
&ohci->hcca_dma);
if (!ohci->hcca) {
kfree (ohci);
return NULL;
}
memset (ohci->hcca, 0, sizeof (struct ohci_hcca));
ohci->disabled = 1;
ohci->sleeping = 0;
ohci->irq = -1;
ohci->regs = mem_base;
ohci->ohci_dev = dev;
pci_set_drvdata(dev, ohci);
INIT_LIST_HEAD (&ohci->ohci_hcd_list);
list_add (&ohci->ohci_hcd_list, &ohci_hcd_list);
INIT_LIST_HEAD (&ohci->timeout_list);
bus = usb_alloc_bus (&sohci_device_operations);
if (!bus) {
kfree (ohci);
return NULL;
}
ohci->bus = bus;
bus->hcpriv = (void *) ohci;
return ohci;
}
/*-------------------------------------------------------------------------*/
/* De-allocate all resources.. */
static void hc_release_ohci (ohci_t * ohci)
{
dbg ("USB HC release ohci usb-%s", ohci->ohci_dev->slot_name);
/* disconnect all devices */
if (ohci->bus->root_hub)
usb_disconnect (&ohci->bus->root_hub);
if (!ohci->disabled)
hc_reset (ohci);
if (ohci->irq >= 0) {
free_irq (ohci->irq, ohci);
ohci->irq = -1;
}
pci_set_drvdata(ohci->ohci_dev, NULL);
usb_deregister_bus (ohci->bus);
usb_free_bus (ohci->bus);
list_del (&ohci->ohci_hcd_list);
INIT_LIST_HEAD (&ohci->ohci_hcd_list);
ohci_mem_cleanup (ohci);
/* unmap the IO address space */
iounmap (ohci->regs);
pci_free_consistent (ohci->ohci_dev, sizeof *ohci->hcca,
ohci->hcca, ohci->hcca_dma);
kfree (ohci);
}
/*-------------------------------------------------------------------------*/
/* Increment the module usage count, start the control thread and
* return success. */
static struct pci_driver ohci_pci_driver;
static int __devinit
hc_found_ohci (struct pci_dev *dev, int irq,
void *mem_base, const struct pci_device_id *id)
{
ohci_t * ohci;
u8 latency, limit;
char buf[8], *bufp = buf;
int ret;
#ifndef __sparc__
sprintf(buf, "%d", irq);
#else
bufp = __irq_itoa(irq);
#endif
printk(KERN_INFO __FILE__ ": USB OHCI at membase 0x%lx, IRQ %s\n",
(unsigned long) mem_base, bufp);
printk(KERN_INFO __FILE__ ": usb-%s, %s\n", dev->slot_name, dev->name);
ohci = hc_alloc_ohci (dev, mem_base);
if (!ohci) {
return -ENOMEM;
}
if ((ret = ohci_mem_init (ohci)) < 0) {
hc_release_ohci (ohci);
return ret;
}
ohci->flags = id->driver_data;
if (ohci->flags & OHCI_QUIRK_AMD756)
printk (KERN_INFO __FILE__ ": AMD756 erratum 4 workaround\n");
/* bad pci latencies can contribute to overruns */
pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency);
if (latency) {
pci_read_config_byte (dev, PCI_MAX_LAT, &limit);
if (limit && limit < latency) {
dbg ("PCI latency reduced to max %d", limit);
pci_write_config_byte (dev, PCI_LATENCY_TIMER, limit);
ohci->pci_latency = limit;
} else {
/* it might already have been reduced */
ohci->pci_latency = latency;
}
}
if (hc_reset (ohci) < 0) {
hc_release_ohci (ohci);
return -ENODEV;
}
/* FIXME this is a second HC reset; why?? */
writel (ohci->hc_control = OHCI_USB_RESET, &ohci->regs->control);
wait_ms (10);
usb_register_bus (ohci->bus);
if (request_irq (irq, hc_interrupt, SA_SHIRQ,
ohci_pci_driver.name, ohci) != 0) {
err ("request interrupt %s failed", bufp);
hc_release_ohci (ohci);
return -EBUSY;
}
ohci->irq = irq;
if (hc_start (ohci) < 0) {
err ("can't start usb-%s", dev->slot_name);
hc_release_ohci (ohci);
return -EBUSY;
}
#ifdef DEBUG
ohci_dump (ohci, 1);
#endif
return 0;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
/* controller died; cleanup debris, then restart */
/* must not be called from interrupt context */
static void hc_restart (ohci_t *ohci)
{
int temp;
int i;
if (ohci->pci_latency)
pci_write_config_byte (ohci->ohci_dev, PCI_LATENCY_TIMER, ohci->pci_latency);
ohci->disabled = 1;
ohci->sleeping = 0;
if (ohci->bus->root_hub)
usb_disconnect (&ohci->bus->root_hub);
/* empty the interrupt branches */
for (i = 0; i < NUM_INTS; i++) ohci->ohci_int_load[i] = 0;
for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table[i] = 0;
/* no EDs to remove */
ohci->ed_rm_list [0] = NULL;
ohci->ed_rm_list [1] = NULL;
/* empty control and bulk lists */
ohci->ed_isotail = NULL;
ohci->ed_controltail = NULL;
ohci->ed_bulktail = NULL;
if ((temp = hc_reset (ohci)) < 0 || (temp = hc_start (ohci)) < 0) {
err ("can't restart usb-%s, %d", ohci->ohci_dev->slot_name, temp);
} else
dbg ("restart usb-%s completed", ohci->ohci_dev->slot_name);
}
#endif /* CONFIG_PM */
/*-------------------------------------------------------------------------*/
/* configured so that an OHCI device is always provided */
/* always called with process context; sleeping is OK */
static int __devinit
ohci_pci_probe (struct pci_dev *dev, const struct pci_device_id *id)
{
unsigned long mem_resource, mem_len;
void *mem_base;
if (pci_enable_device(dev) < 0)
return -ENODEV;
if (!dev->irq) {
err("found OHCI device with no IRQ assigned. check BIOS settings!");
return -ENODEV;
}
/* we read its hardware registers as memory */
mem_resource = pci_resource_start(dev, 0);
mem_len = pci_resource_len(dev, 0);
if (!request_mem_region (mem_resource, mem_len, ohci_pci_driver.name)) {
dbg ("controller already in use");
return -EBUSY;
}
mem_base = ioremap_nocache (mem_resource, mem_len);
if (!mem_base) {
err("Error mapping OHCI memory");
return -EFAULT;
}
/* controller writes into our memory */
pci_set_master (dev);
return hc_found_ohci (dev, dev->irq, mem_base, id);
}
/*-------------------------------------------------------------------------*/
/* may be called from interrupt context [interface spec] */
/* may be called without controller present */
/* may be called with controller, bus, and devices active */
static void __devexit
ohci_pci_remove (struct pci_dev *dev)
{
ohci_t *ohci = pci_get_drvdata(dev);
dbg ("remove %s controller usb-%s%s%s",
hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
dev->slot_name,
ohci->disabled ? " (disabled)" : "",
in_interrupt () ? " in interrupt" : ""
);
#ifdef DEBUG
ohci_dump (ohci, 1);
#endif
/* don't wake up sleeping controllers, or block in interrupt context */
if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER || in_interrupt ()) {
dbg ("controller being disabled");
ohci->disabled = 1;
}
/* on return, USB will always be reset (if present) */
if (ohci->disabled)
writel (ohci->hc_control = OHCI_USB_RESET,
&ohci->regs->control);
hc_release_ohci (ohci);
release_mem_region (pci_resource_start (dev, 0), pci_resource_len (dev, 0));
}
#ifdef CONFIG_PM
/*-------------------------------------------------------------------------*/
static int
ohci_pci_suspend (struct pci_dev *dev, u32 state)
{
ohci_t *ohci = pci_get_drvdata(dev);
unsigned long flags;
u16 cmd;
if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER) {
dbg ("can't suspend usb-%s (state is %s)", dev->slot_name,
hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS));
return -EIO;
}
/* act as if usb suspend can always be used */
info ("USB suspend: usb-%s", dev->slot_name);
ohci->sleeping = 1;
/* First stop processing */
spin_lock_irqsave (&usb_ed_lock, flags);
ohci->hc_control &= ~(OHCI_CTRL_PLE|OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_IE);
writel (ohci->hc_control, &ohci->regs->control);
writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
(void) readl (&ohci->regs->intrstatus);
spin_unlock_irqrestore (&usb_ed_lock, flags);
/* Wait a frame or two */
mdelay(1);
if (!readl (&ohci->regs->intrstatus) & OHCI_INTR_SF)
mdelay (1);
#ifdef CONFIG_PMAC_PBOOK
if (_machine == _MACH_Pmac)
disable_irq (ohci->irq);
/* else, 2.4 assumes shared irqs -- don't disable */
#endif
/* Enable remote wakeup */
writel (readl(&ohci->regs->intrenable) | OHCI_INTR_RD, &ohci->regs->intrenable);
/* Suspend chip and let things settle down a bit */
ohci->hc_control = OHCI_USB_SUSPEND;
writel (ohci->hc_control, &ohci->regs->control);
(void) readl (&ohci->regs->control);
mdelay (500); /* No schedule here ! */
switch (readl (&ohci->regs->control) & OHCI_CTRL_HCFS) {
case OHCI_USB_RESET:
dbg("Bus in reset phase ???");
break;
case OHCI_USB_RESUME:
dbg("Bus in resume phase ???");
break;
case OHCI_USB_OPER:
dbg("Bus in operational phase ???");
break;
case OHCI_USB_SUSPEND:
dbg("Bus suspended");
break;
}
/* In some rare situations, Apple's OHCI have happily trashed
* memory during sleep. We disable it's bus master bit during
* suspend
*/
pci_read_config_word (dev, PCI_COMMAND, &cmd);
cmd &= ~PCI_COMMAND_MASTER;
pci_write_config_word (dev, PCI_COMMAND, cmd);
#ifdef CONFIG_PMAC_PBOOK
{
struct device_node *of_node;
/* Disable USB PAD & cell clock */
of_node = pci_device_to_OF_node (ohci->ohci_dev);
if (of_node)
pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
}
#endif
return 0;
}
/*-------------------------------------------------------------------------*/
static int
ohci_pci_resume (struct pci_dev *dev)
{
ohci_t *ohci = pci_get_drvdata(dev);
int temp;
unsigned long flags;
/* guard against multiple resumes */
atomic_inc (&ohci->resume_count);
if (atomic_read (&ohci->resume_count) != 1) {
err ("concurrent PCI resumes for usb-%s", dev->slot_name);
atomic_dec (&ohci->resume_count);
return 0;
}
#ifdef CONFIG_PMAC_PBOOK
{
struct device_node *of_node;
/* Re-enable USB PAD & cell clock */
of_node = pci_device_to_OF_node (ohci->ohci_dev);
if (of_node)
pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 1);
}
#endif
/* did we suspend, or were we powered off? */
ohci->hc_control = readl (&ohci->regs->control);
temp = ohci->hc_control & OHCI_CTRL_HCFS;
#ifdef DEBUG
/* the registers may look crazy here */
ohci_dump_status (ohci);
#endif
/* Re-enable bus mastering */
pci_set_master(ohci->ohci_dev);
switch (temp) {
case OHCI_USB_RESET: // lost power
info ("USB restart: usb-%s", dev->slot_name);
hc_restart (ohci);
break;
case OHCI_USB_SUSPEND: // host wakeup
case OHCI_USB_RESUME: // remote wakeup
info ("USB continue: usb-%s from %s wakeup", dev->slot_name,
(temp == OHCI_USB_SUSPEND)
? "host" : "remote");
ohci->hc_control = OHCI_USB_RESUME;
writel (ohci->hc_control, &ohci->regs->control);
(void) readl (&ohci->regs->control);
mdelay (20); /* no schedule here ! */
/* Some controllers (lucent) need a longer delay here */
mdelay (15);
temp = readl (&ohci->regs->control);
temp = ohci->hc_control & OHCI_CTRL_HCFS;
if (temp != OHCI_USB_RESUME) {
err ("controller usb-%s won't resume", dev->slot_name);
ohci->disabled = 1;
return -EIO;
}
/* Some chips likes being resumed first */
writel (OHCI_USB_OPER, &ohci->regs->control);
(void) readl (&ohci->regs->control);
mdelay (3);
/* Then re-enable operations */
spin_lock_irqsave (&usb_ed_lock, flags);
ohci->disabled = 0;
ohci->sleeping = 0;
ohci->hc_control = OHCI_CONTROL_INIT | OHCI_USB_OPER;
if (!ohci->ed_rm_list[0] && !ohci->ed_rm_list[1]) {
if (ohci->ed_controltail)
ohci->hc_control |= OHCI_CTRL_CLE;
if (ohci->ed_bulktail)
ohci->hc_control |= OHCI_CTRL_BLE;
}
writel (ohci->hc_control, &ohci->regs->control);
writel (OHCI_INTR_SF, &ohci->regs->intrstatus);
writel (OHCI_INTR_SF, &ohci->regs->intrenable);
/* Check for a pending done list */
writel (OHCI_INTR_WDH, &ohci->regs->intrdisable);
(void) readl (&ohci->regs->intrdisable);
spin_unlock_irqrestore (&usb_ed_lock, flags);
#ifdef CONFIG_PMAC_PBOOK
if (_machine == _MACH_Pmac)
enable_irq (ohci->irq);
#endif
if (ohci->hcca->done_head)
dl_done_list (ohci, dl_reverse_done_list (ohci));
writel (OHCI_INTR_WDH, &ohci->regs->intrenable);
writel (OHCI_BLF, &ohci->regs->cmdstatus); /* start bulk list */
writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */
break;
default:
warn ("odd PCI resume for usb-%s", dev->slot_name);
}
/* controller is operational, extra resumes are harmless */
atomic_dec (&ohci->resume_count);
return 0;
}
#endif /* CONFIG_PM */
/*-------------------------------------------------------------------------*/
static const struct pci_device_id __devinitdata ohci_pci_ids [] = { {
/*
* AMD-756 [Viper] USB has a serious erratum when used with
* lowspeed devices like mice.
*/
vendor: 0x1022,
device: 0x740c,
subvendor: PCI_ANY_ID,
subdevice: PCI_ANY_ID,
driver_data: OHCI_QUIRK_AMD756,
} , {
/* handle any USB OHCI controller */
class: ((PCI_CLASS_SERIAL_USB << 8) | 0x10),
class_mask: ~0,
/* 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, ohci_pci_ids);
static struct pci_driver ohci_pci_driver = {
name: "usb-ohci",
id_table: &ohci_pci_ids [0],
probe: ohci_pci_probe,
remove: __devexit_p(ohci_pci_remove),
#ifdef CONFIG_PM
suspend: ohci_pci_suspend,
resume: ohci_pci_resume,
#endif /* PM */
};
/*-------------------------------------------------------------------------*/
static int __init ohci_hcd_init (void)
{
return pci_module_init (&ohci_pci_driver);
}
/*-------------------------------------------------------------------------*/
static void __exit ohci_hcd_cleanup (void)
{
pci_unregister_driver (&ohci_pci_driver);
}
module_init (ohci_hcd_init);
module_exit (ohci_hcd_cleanup);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
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