coreboot-kgpe-d16/payloads/libpayload/drivers/usb/uhci.c

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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008-2010 coresystems GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
//#define USB_DEBUG
#include <arch/virtual.h>
#include <usb/usb.h>
#include "uhci.h"
#include "uhci_private.h"
static void uhci_start (hci_t *controller);
static void uhci_stop (hci_t *controller);
static void uhci_reset (hci_t *controller);
static void uhci_shutdown (hci_t *controller);
static int uhci_bulk (endpoint_t *ep, int size, u8 *data, int finalize);
static int uhci_control (usbdev_t *dev, direction_t dir, int drlen, void *devreq,
int dalen, u8 *data);
static void* uhci_create_intr_queue (endpoint_t *ep, int reqsize, int reqcount, int reqtiming);
static void uhci_destroy_intr_queue (endpoint_t *ep, void *queue);
static u8* uhci_poll_intr_queue (void *queue);
#if 0
/* dump uhci */
static void
uhci_dump (hci_t *controller)
{
usb_debug ("dump:\nUSBCMD: %x\n", uhci_reg_read16 (controller, USBCMD));
usb_debug ("USBSTS: %x\n", uhci_reg_read16 (controller, USBSTS));
usb_debug ("USBINTR: %x\n", uhci_reg_read16 (controller, USBINTR));
usb_debug ("FRNUM: %x\n", uhci_reg_read16 (controller, FRNUM));
usb_debug ("FLBASEADD: %x\n", uhci_reg_read32 (controller, FLBASEADD));
usb_debug ("SOFMOD: %x\n", uhci_reg_read8 (controller, SOFMOD));
usb_debug ("PORTSC1: %x\n", uhci_reg_read16 (controller, PORTSC1));
usb_debug ("PORTSC2: %x\n", uhci_reg_read16 (controller, PORTSC2));
}
#endif
static void td_dump(td_t *td)
{
usb_debug("+---------------------------------------------------+\n");
if ((td->token & TD_PID_MASK) == UHCI_SETUP)
usb_debug("|..[SETUP]..........................................|\n");
else if ((td->token & TD_PID_MASK) == UHCI_IN)
usb_debug("|..[IN].............................................|\n");
else if ((td->token & TD_PID_MASK) == UHCI_OUT)
usb_debug("|..[OUT]............................................|\n");
else
usb_debug("|..[]...............................................|\n");
usb_debug("|:|============ UHCI TD at [0x%08lx] ==========|:|\n", virt_to_phys(td));
usb_debug("|:+-----------------------------------------------+:|\n");
usb_debug("|:| Next TD/QH [0x%08lx] |:|\n", td->ptr & ~0xFUL);
usb_debug("|:+-----------------------------------------------+:|\n");
usb_debug("|:| Depth/Breath [%lx] | QH/TD [%lx] | TERMINATE [%lx] |:|\n",
(td->ptr & (1UL << 2)) >> 2, (td->ptr & (1UL << 1)) >> 1, td->ptr & 1UL);
usb_debug("|:+-----------------------------------------------+:|\n");
usb_debug("|:| T | Maximum Length | [%04lx] |:|\n", (td->token & (0x7FFUL << 21)) >> 21);
usb_debug("|:| O | PID CODE | [%04lx] |:|\n", td->token & 0xFF);
usb_debug("|:| K | Endpoint | [%04lx] |:|\n", (td->token & TD_EP_MASK) >> TD_EP_SHIFT);
usb_debug("|:| E | Device Address | [%04lx] |:|\n", (td->token & (0x7FUL << 8)) >> 8);
usb_debug("|:| N | Data Toggle | [%lx] |:|\n", (td->token & (1UL << 19)) >> 19);
usb_debug("|:+-----------------------------------------------+:|\n");
usb_debug("|:| C | Short Packet Detector | [%lx] |:|\n", (td->ctrlsts & (1UL << 29)) >> 29);
usb_debug("|:| O | Error Counter | [%lx] |:|\n",
(td->ctrlsts & (3UL << TD_COUNTER_SHIFT)) >> TD_COUNTER_SHIFT);
usb_debug("|:| N | Low Speed Device | [%lx] |:|\n", (td->ctrlsts & (1UL << 26)) >> 26);
usb_debug("|:| T | Isochronous Select | [%lx] |:|\n", (td->ctrlsts & (1UL << 25)) >> 25);
usb_debug("|:| R | Interrupt on Complete (IOC) | [%lx] |:|\n", (td->ctrlsts & (1UL << 24)) >> 24);
usb_debug("|:+ O ----------------------------------------+:|\n");
usb_debug("|:| L | Active | [%lx] |:|\n", (td->ctrlsts & (1UL << 23)) >> 23);
usb_debug("|:| & | Stalled | [%lx] |:|\n", (td->ctrlsts & (1UL << 22)) >> 22);
usb_debug("|:| S | Data Buffer Error | [%lx] |:|\n", (td->ctrlsts & (1UL << 21)) >> 21);
usb_debug("|:| T | Bubble Detected | [%lx] |:|\n", (td->ctrlsts & (1UL << 20)) >> 20);
usb_debug("|:| A | NAK Received | [%lx] |:|\n", (td->ctrlsts & (1UL << 19)) >> 19);
usb_debug("|:| T | CRC/Timeout Error | [%lx] |:|\n", (td->ctrlsts & (1UL << 18)) >> 18);
usb_debug("|:| U | Bitstuff Error | [%lx] |:|\n", (td->ctrlsts & (1UL << 17)) >> 17);
usb_debug("|:| S ----------------------------------------|:|\n");
usb_debug("|:| | Actual Length | [%04lx] |:|\n", td->ctrlsts & 0x7FFUL);
usb_debug("|:+-----------------------------------------------+:|\n");
usb_debug("|:| Buffer pointer [0x%08lx] |:|\n", td->bufptr);
usb_debug("|:|-----------------------------------------------|:|\n");
usb_debug("|...................................................|\n");
usb_debug("+---------------------------------------------------+\n");
}
static void
uhci_reset (hci_t *controller)
{
/* reset */
uhci_reg_write16 (controller, USBCMD, 4); /* Global Reset */
mdelay (50); /* uhci spec 2.1.1: at least 10ms */
uhci_reg_write16 (controller, USBCMD, 0);
mdelay (10);
uhci_reg_write16 (controller, USBCMD, 2); /* Host Controller Reset */
/* wait for controller to finish reset */
/* TOTEST: how long to wait? 100ms for now */
int timeout = 200; /* time out after 200 * 500us == 100ms */
while (((uhci_reg_read16 (controller, USBCMD) & 2) != 0) && timeout--)
udelay (500);
if (timeout < 0)
usb_debug ("Warning: uhci: host controller reset timed out.\n");
}
static void
uhci_reinit (hci_t *controller)
{
uhci_reg_write32 (controller, FLBASEADD,
(u32) virt_to_phys (UHCI_INST (controller)->
framelistptr));
//usb_debug ("framelist at %p\n",UHCI_INST(controller)->framelistptr);
/* disable irqs */
uhci_reg_write16 (controller, USBINTR, 0);
/* reset framelist index */
uhci_reg_write16 (controller, FRNUM, 0);
uhci_reg_write16(controller, USBCMD,
uhci_reg_read16(controller, USBCMD) | 0xc0); // max packets, configure flag
uhci_start (controller);
}
hci_t *
uhci_pci_init (pcidev_t addr)
{
int i;
u16 reg16;
hci_t *controller = new_controller ();
controller->pcidev = addr;
controller->instance = xzalloc(sizeof (uhci_t));
controller->type = UHCI;
controller->start = uhci_start;
controller->stop = uhci_stop;
controller->reset = uhci_reset;
controller->init = uhci_reinit;
controller->shutdown = uhci_shutdown;
controller->bulk = uhci_bulk;
controller->control = uhci_control;
controller->set_address = generic_set_address;
controller->finish_device_config = NULL;
controller->destroy_device = NULL;
controller->create_intr_queue = uhci_create_intr_queue;
controller->destroy_intr_queue = uhci_destroy_intr_queue;
controller->poll_intr_queue = uhci_poll_intr_queue;
init_device_entry (controller, 0);
UHCI_INST (controller)->roothub = controller->devices[0];
/* ~1 clears the register type indicator that is set to 1
* for IO space */
controller->reg_base = pci_read_config32 (addr, 0x20) & ~1;
/* kill legacy support handler */
uhci_stop (controller);
mdelay (1);
uhci_reg_write16 (controller, USBSTS, 0x3f);
reg16 = pci_read_config16(addr, 0xc0);
reg16 &= 0xdf80;
pci_write_config16 (addr, 0xc0, reg16);
UHCI_INST (controller)->framelistptr = memalign (0x1000, 1024 * sizeof (flistp_t)); /* 4kb aligned to 4kb */
if (! UHCI_INST (controller)->framelistptr)
fatal("Not enough memory for USB frame list pointer.\n");
memset (UHCI_INST (controller)->framelistptr, 0,
1024 * sizeof (flistp_t));
/* According to the *BSD UHCI code, this one is needed on some
PIIX chips, because otherwise they misbehave. It must be
added to the last chain.
FIXME: this leaks, if the driver should ever be reinited
for some reason. Not a problem now.
*/
td_t *antiberserk = memalign(16, sizeof(td_t));
if (!antiberserk)
fatal("Not enough memory for chipset workaround.\n");
memset(antiberserk, 0, sizeof(td_t));
UHCI_INST (controller)->qh_prei = memalign (16, sizeof (qh_t));
UHCI_INST (controller)->qh_intr = memalign (16, sizeof (qh_t));
UHCI_INST (controller)->qh_data = memalign (16, sizeof (qh_t));
UHCI_INST (controller)->qh_last = memalign (16, sizeof (qh_t));
if (! UHCI_INST (controller)->qh_prei ||
! UHCI_INST (controller)->qh_intr ||
! UHCI_INST (controller)->qh_data ||
! UHCI_INST (controller)->qh_last)
fatal("Not enough memory for USB controller queues.\n");
UHCI_INST (controller)->qh_prei->headlinkptr =
virt_to_phys (UHCI_INST (controller)->qh_intr) | FLISTP_QH;
UHCI_INST (controller)->qh_prei->elementlinkptr = 0 | FLISTP_TERMINATE;
UHCI_INST (controller)->qh_intr->headlinkptr =
virt_to_phys (UHCI_INST (controller)->qh_data) | FLISTP_QH;
UHCI_INST (controller)->qh_intr->elementlinkptr = 0 | FLISTP_TERMINATE;
UHCI_INST (controller)->qh_data->headlinkptr =
virt_to_phys (UHCI_INST (controller)->qh_last) | FLISTP_QH;
UHCI_INST (controller)->qh_data->elementlinkptr = 0 | FLISTP_TERMINATE;
UHCI_INST (controller)->qh_last->headlinkptr = virt_to_phys (UHCI_INST (controller)->qh_data) | FLISTP_TERMINATE;
UHCI_INST (controller)->qh_last->elementlinkptr = virt_to_phys (antiberserk) | FLISTP_TERMINATE;
for (i = 0; i < 1024; i++) {
UHCI_INST (controller)->framelistptr[i] =
virt_to_phys (UHCI_INST (controller)->qh_prei) | FLISTP_QH;
}
controller->devices[0]->controller = controller;
controller->devices[0]->init = uhci_rh_init;
controller->devices[0]->init (controller->devices[0]);
uhci_reset (controller);
uhci_reinit (controller);
return controller;
}
static void
uhci_shutdown (hci_t *controller)
{
if (controller == 0)
return;
detach_controller (controller);
uhci_reg_write16(controller, USBCMD,
uhci_reg_read16(controller, USBCMD) & 0); // stop work
free (UHCI_INST (controller)->framelistptr);
free (UHCI_INST (controller)->qh_prei);
free (UHCI_INST (controller)->qh_intr);
free (UHCI_INST (controller)->qh_data);
free (UHCI_INST (controller)->qh_last);
free (UHCI_INST (controller));
free (controller);
}
static void
uhci_start (hci_t *controller)
{
uhci_reg_write16(controller, USBCMD,
uhci_reg_read16(controller, USBCMD) | 1); // start work on schedule
}
static void
uhci_stop (hci_t *controller)
{
uhci_reg_write16(controller, USBCMD,
uhci_reg_read16(controller, USBCMD) & ~1); // stop work on schedule
}
#define GET_TD(x) ((void*)(((unsigned int)(x))&~0xf))
static td_t *
wait_for_completed_qh (hci_t *controller, qh_t *qh)
{
int timeout = 1000; /* max 30 ms. */
void *current = GET_TD (qh->elementlinkptr);
while (((qh->elementlinkptr & FLISTP_TERMINATE) == 0) && (timeout-- > 0)) {
if (current != GET_TD (qh->elementlinkptr)) {
current = GET_TD (qh->elementlinkptr);
timeout = 1000;
}
uhci_reg_write16(controller, USBSTS,
uhci_reg_read16(controller, USBSTS) | 0); // clear resettable registers
udelay (30);
}
return (GET_TD (qh->elementlinkptr) ==
0) ? 0 : GET_TD (phys_to_virt (qh->elementlinkptr));
}
static int
maxlen (int size)
{
return (size - 1) & 0x7ff;
}
static int
min (int a, int b)
{
if (a < b)
return a;
else
return b;
}
static int
uhci_control (usbdev_t *dev, direction_t dir, int drlen, void *devreq, int dalen,
unsigned char *data)
{
int endp = 0; /* this is control: always 0 */
int mlen = dev->endpoints[0].maxpacketsize;
int count = (2 + (dalen + mlen - 1) / mlen);
unsigned short req = ((unsigned short *) devreq)[0];
int i;
td_t *tds = memalign (16, sizeof (td_t) * count);
if (!tds)
fatal("Not enough memory for uhci control.\n");
memset (tds, 0, sizeof (td_t) * count);
count--; /* to compensate for 0-indexed array */
for (i = 0; i < count; i++) {
tds[i].ptr = virt_to_phys (&tds[i + 1]) | TD_DEPTH_FIRST;
}
tds[count].ptr = 0 | TD_DEPTH_FIRST | TD_TERMINATE;
tds[0].token = UHCI_SETUP |
dev->address << TD_DEVADDR_SHIFT |
endp << TD_EP_SHIFT |
TD_TOGGLE_DATA0 |
maxlen(drlen) << TD_MAXLEN_SHIFT;
tds[0].bufptr = virt_to_phys (devreq);
tds[0].ctrlsts = (3 << TD_COUNTER_SHIFT) |
(dev->speed?TD_LOWSPEED:0) |
TD_STATUS_ACTIVE;
int toggle = 1;
for (i = 1; i < count; i++) {
switch (dir) {
case SETUP: tds[i].token = UHCI_SETUP; break;
case IN: tds[i].token = UHCI_IN; break;
case OUT: tds[i].token = UHCI_OUT; break;
}
tds[i].token |= dev->address << TD_DEVADDR_SHIFT |
endp << TD_EP_SHIFT |
maxlen (min (mlen, dalen)) << TD_MAXLEN_SHIFT |
toggle << TD_TOGGLE_SHIFT;
tds[i].bufptr = virt_to_phys (data);
tds[i].ctrlsts = (3 << TD_COUNTER_SHIFT) |
(dev->speed?TD_LOWSPEED:0) |
TD_STATUS_ACTIVE;
toggle ^= 1;
dalen -= mlen;
data += mlen;
}
tds[count].token = ((dir == OUT) ? UHCI_IN : UHCI_OUT) |
dev->address << TD_DEVADDR_SHIFT |
endp << TD_EP_SHIFT |
maxlen(0) << TD_MAXLEN_SHIFT |
TD_TOGGLE_DATA1;
tds[count].bufptr = 0;
tds[count].ctrlsts = (0 << TD_COUNTER_SHIFT) | /* as Linux 2.4.10 does */
(dev->speed?TD_LOWSPEED:0) |
TD_STATUS_ACTIVE;
UHCI_INST (dev->controller)->qh_data->elementlinkptr =
virt_to_phys (tds) & ~(FLISTP_QH | FLISTP_TERMINATE);
td_t *td = wait_for_completed_qh (dev->controller,
UHCI_INST (dev->controller)->
qh_data);
int result;
if (td == 0) {
result = 0;
} else {
usb_debug ("control packet, req %x\n", req);
td_dump (td);
libpayload: Make USB transfer functions return amount of bytes The USB bulk and control transfer functions in libpayload currently always return 0 for success and 1 for all errors. This is sufficient for current use cases (essentially just mass storage), but other classes (like certain Ethernet adapters) need to be able to tell if a transfer reached the intended amount of bytes, or if it fell short. This patch slightly changes that USB API to return -1 on errors, and the amount of transferred bytes on successes. All drivers in the current libpayload mainline are modified to conform to the new error detection model. Any third party users of this API will need to adapt their if (...<controller>->bulk/control(...)) checks to if (...<controller>->bulk/control(...) < 0) as well. The host controller drivers for OHCI and EHCI correctly implement the new behavior. UHCI and the XHCI stub just comply with the new API by returning 0 or -1, but do not actually count the returned bytes. Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/48308 Reviewed-by: Gabe Black <gabeblack@chromium.org> Reviewed-by: Stefan Reinauer <reinauer@google.com> Tested-by: Gabe Black <gabeblack@chromium.org> Commit-Queue: Gabe Black <gabeblack@chromium.org> Updated the patch to support XHCI as well. Change-Id: Ic2ea2810c5edb992cbe185bc9711d2f8f557cae6 (cherry picked from commit e39e2d84762a3804653d950a228ed2269c651458) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6390 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
2013-02-21 22:41:40 +01:00
result = -1;
}
free (tds);
return result;
}
static td_t *
create_schedule (int numpackets)
{
if (numpackets == 0)
return 0;
td_t *tds = memalign (16, sizeof (td_t) * numpackets);
if (!tds)
fatal("Not enough memory for packets scheduling.\n");
memset (tds, 0, sizeof (td_t) * numpackets);
int i;
for (i = 0; i < numpackets; i++) {
tds[i].ptr = virt_to_phys (&tds[i + 1]) | TD_DEPTH_FIRST;
}
tds[numpackets - 1].ptr = 0 | TD_TERMINATE;
return tds;
}
static void
fill_schedule (td_t *td, endpoint_t *ep, int length, unsigned char *data,
int *toggle)
{
switch (ep->direction) {
case IN: td->token = UHCI_IN; break;
case OUT: td->token = UHCI_OUT; break;
case SETUP: td->token = UHCI_SETUP; break;
}
td->token |= ep->dev->address << TD_DEVADDR_SHIFT |
(ep->endpoint & 0xf) << TD_EP_SHIFT |
maxlen (length) << TD_MAXLEN_SHIFT |
(*toggle & 1) << TD_TOGGLE_SHIFT;
td->bufptr = virt_to_phys (data);
td->ctrlsts = ((ep->direction == SETUP?3:0) << TD_COUNTER_SHIFT) |
(ep->dev->speed?TD_LOWSPEED:0) |
TD_STATUS_ACTIVE;
*toggle ^= 1;
}
static int
run_schedule (usbdev_t *dev, td_t *td)
{
UHCI_INST (dev->controller)->qh_data->elementlinkptr =
virt_to_phys (td) & ~(FLISTP_QH | FLISTP_TERMINATE);
td = wait_for_completed_qh (dev->controller,
UHCI_INST (dev->controller)->qh_data);
if (td == 0) {
return 0;
} else {
td_dump (td);
return 1;
}
}
/* finalize == 1: if data is of packet aligned size, add a zero length packet */
static int
uhci_bulk (endpoint_t *ep, int size, u8 *data, int finalize)
{
int maxpsize = ep->maxpacketsize;
if (maxpsize == 0)
fatal("MaxPacketSize == 0!!!");
int numpackets = (size + maxpsize - 1) / maxpsize;
if (finalize && ((size % maxpsize) == 0)) {
numpackets++;
}
if (numpackets == 0)
return 0;
td_t *tds = create_schedule (numpackets);
int i = 0, toggle = ep->toggle;
while ((size > 0) || ((size == 0) && (finalize != 0))) {
fill_schedule (&tds[i], ep, min (size, maxpsize), data,
&toggle);
i++;
data += maxpsize;
size -= maxpsize;
}
if (run_schedule (ep->dev, tds) == 1) {
free (tds);
libpayload: Make USB transfer functions return amount of bytes The USB bulk and control transfer functions in libpayload currently always return 0 for success and 1 for all errors. This is sufficient for current use cases (essentially just mass storage), but other classes (like certain Ethernet adapters) need to be able to tell if a transfer reached the intended amount of bytes, or if it fell short. This patch slightly changes that USB API to return -1 on errors, and the amount of transferred bytes on successes. All drivers in the current libpayload mainline are modified to conform to the new error detection model. Any third party users of this API will need to adapt their if (...<controller>->bulk/control(...)) checks to if (...<controller>->bulk/control(...) < 0) as well. The host controller drivers for OHCI and EHCI correctly implement the new behavior. UHCI and the XHCI stub just comply with the new API by returning 0 or -1, but do not actually count the returned bytes. Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/48308 Reviewed-by: Gabe Black <gabeblack@chromium.org> Reviewed-by: Stefan Reinauer <reinauer@google.com> Tested-by: Gabe Black <gabeblack@chromium.org> Commit-Queue: Gabe Black <gabeblack@chromium.org> Updated the patch to support XHCI as well. Change-Id: Ic2ea2810c5edb992cbe185bc9711d2f8f557cae6 (cherry picked from commit e39e2d84762a3804653d950a228ed2269c651458) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6390 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
2013-02-21 22:41:40 +01:00
return -1;
}
ep->toggle = toggle;
free (tds);
return 0;
}
typedef struct {
qh_t *qh;
td_t *tds;
td_t *last_td;
u8 *data;
int lastread;
int total;
int reqsize;
} intr_q;
/* create and hook-up an intr queue into device schedule */
static void*
uhci_create_intr_queue (endpoint_t *ep, int reqsize, int reqcount, int reqtiming)
{
u8 *data = malloc(reqsize*reqcount);
td_t *tds = memalign(16, sizeof(td_t) * reqcount);
qh_t *qh = memalign(16, sizeof(qh_t));
if (!data || !tds || !qh)
fatal("Not enough memory to create USB intr queue prerequisites.\n");
qh->elementlinkptr = virt_to_phys(tds);
intr_q *q = malloc(sizeof(intr_q));
if (!q)
fatal("Not enough memory to create USB intr queue.\n");
q->qh = qh;
q->tds = tds;
q->data = data;
q->lastread = 0;
q->total = reqcount;
q->reqsize = reqsize;
q->last_td = &tds[reqcount - 1];
memset (tds, 0, sizeof (td_t) * reqcount);
int i;
for (i = 0; i < reqcount; i++) {
tds[i].ptr = virt_to_phys (&tds[i + 1]);
switch (ep->direction) {
case IN: tds[i].token = UHCI_IN; break;
case OUT: tds[i].token = UHCI_OUT; break;
case SETUP: tds[i].token = UHCI_SETUP; break;
}
tds[i].token |= ep->dev->address << TD_DEVADDR_SHIFT |
(ep->endpoint & 0xf) << TD_EP_SHIFT |
maxlen (reqsize) << TD_MAXLEN_SHIFT |
(ep->toggle & 1) << TD_TOGGLE_SHIFT;
tds[i].bufptr = virt_to_phys (data);
tds[i].ctrlsts = (0 << TD_COUNTER_SHIFT) |
(ep->dev->speed?TD_LOWSPEED:0) |
TD_STATUS_ACTIVE;
ep->toggle ^= 1;
data += reqsize;
}
tds[reqcount - 1].ptr = 0 | TD_TERMINATE;
/* insert QH into framelist */
uhci_t *const uhcic = UHCI_INST(ep->dev->controller);
const u32 def_ptr = virt_to_phys(uhcic->qh_prei) | FLISTP_QH;
int nothing_placed = 1;
qh->headlinkptr = def_ptr;
for (i = 0; i < 1024; i += reqtiming) {
/* advance to the next free position */
while ((i < 1024) && (uhcic->framelistptr[i] != def_ptr)) ++i;
if (i < 1024) {
uhcic->framelistptr[i] = virt_to_phys(qh) | FLISTP_QH;
nothing_placed = 0;
}
}
if (nothing_placed) {
usb_debug("Error: Failed to place UHCI interrupt queue "
"head into framelist: no space left\n");
uhci_destroy_intr_queue(ep, q);
return NULL;
}
return q;
}
/* remove queue from device schedule, dropping all data that came in */
static void
uhci_destroy_intr_queue (endpoint_t *ep, void *q_)
{
intr_q *const q = (intr_q*)q_;
/* remove QH from framelist */
uhci_t *const uhcic = UHCI_INST(ep->dev->controller);
const u32 qh_ptr = virt_to_phys(q->qh) | FLISTP_QH;
const u32 def_ptr = virt_to_phys(uhcic->qh_prei) | FLISTP_QH;
int i;
for (i = 0; i < 1024; ++i) {
if (uhcic->framelistptr[i] == qh_ptr)
uhcic->framelistptr[i] = def_ptr;
}
free(q->data);
free(q->tds);
free(q->qh);
free(q);
}
/* read one intr-packet from queue, if available. extend the queue for new input.
return NULL if nothing new available.
Recommended use: while (data=poll_intr_queue(q)) process(data);
*/
static u8*
uhci_poll_intr_queue (void *q_)
{
intr_q *q = (intr_q*)q_;
if ((q->tds[q->lastread].ctrlsts & TD_STATUS_ACTIVE) == 0) {
int current = q->lastread;
int previous;
if (q->lastread == 0) {
previous = q->total - 1;
} else {
previous = q->lastread - 1;
}
q->tds[previous].ctrlsts &= ~TD_STATUS_MASK;
q->tds[previous].ptr = 0 | TD_TERMINATE;
if (q->last_td != &q->tds[previous]) {
q->last_td->ptr = virt_to_phys(&q->tds[previous]) & ~TD_TERMINATE;
q->last_td = &q->tds[previous];
}
q->tds[previous].ctrlsts |= TD_STATUS_ACTIVE;
q->lastread = (q->lastread + 1) % q->total;
if (!(q->tds[current].ctrlsts & TD_STATUS_MASK))
return &q->data[current*q->reqsize];
}
/* reset queue if we fully processed it after underrun */
else if (q->qh->elementlinkptr & FLISTP_TERMINATE) {
usb_debug("resetting underrun uhci interrupt queue.\n");
q->qh->elementlinkptr = virt_to_phys(q->tds + q->lastread);
}
return NULL;
}
void
uhci_reg_write32 (hci_t *ctrl, usbreg reg, u32 value)
{
outl (value, ctrl->reg_base + reg);
}
u32
uhci_reg_read32 (hci_t *ctrl, usbreg reg)
{
return inl (ctrl->reg_base + reg);
}
void
uhci_reg_write16 (hci_t *ctrl, usbreg reg, u16 value)
{
outw (value, ctrl->reg_base + reg);
}
u16
uhci_reg_read16 (hci_t *ctrl, usbreg reg)
{
return inw (ctrl->reg_base + reg);
}
void
uhci_reg_write8 (hci_t *ctrl, usbreg reg, u8 value)
{
outb (value, ctrl->reg_base + reg);
}
u8
uhci_reg_read8 (hci_t *ctrl, usbreg reg)
{
return inb (ctrl->reg_base + reg);
}