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historical/m0-applesillicon.git/xnu-qemu-arm64-5.1.0/hw/usb/hcd-uhci.c
ThatLinuxFan 4061214e6a phht hahahahaah
2024-01-16 11:20:27 -06:00

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/*
* USB UHCI controller emulation
*
* Copyright (c) 2005 Fabrice Bellard
*
* Copyright (c) 2008 Max Krasnyansky
* Magor rewrite of the UHCI data structures parser and frame processor
* Support for fully async operation and multiple outstanding transactions
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/usb.h"
#include "hw/usb/uhci-regs.h"
#include "migration/vmstate.h"
#include "hw/pci/pci.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "qemu/iov.h"
#include "sysemu/dma.h"
#include "trace.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#define FRAME_TIMER_FREQ 1000
#define FRAME_MAX_LOOPS 256
/* Must be large enough to handle 10 frame delay for initial isoc requests */
#define QH_VALID 32
#define MAX_FRAMES_PER_TICK (QH_VALID / 2)
#define NB_PORTS 2
enum {
TD_RESULT_STOP_FRAME = 10,
TD_RESULT_COMPLETE,
TD_RESULT_NEXT_QH,
TD_RESULT_ASYNC_START,
TD_RESULT_ASYNC_CONT,
};
typedef struct UHCIState UHCIState;
typedef struct UHCIAsync UHCIAsync;
typedef struct UHCIQueue UHCIQueue;
typedef struct UHCIInfo UHCIInfo;
typedef struct UHCIPCIDeviceClass UHCIPCIDeviceClass;
struct UHCIInfo {
const char *name;
uint16_t vendor_id;
uint16_t device_id;
uint8_t revision;
uint8_t irq_pin;
void (*realize)(PCIDevice *dev, Error **errp);
bool unplug;
};
struct UHCIPCIDeviceClass {
PCIDeviceClass parent_class;
UHCIInfo info;
};
/*
* Pending async transaction.
* 'packet' must be the first field because completion
* handler does "(UHCIAsync *) pkt" cast.
*/
struct UHCIAsync {
USBPacket packet;
uint8_t static_buf[64]; /* 64 bytes is enough, except for isoc packets */
uint8_t *buf;
UHCIQueue *queue;
QTAILQ_ENTRY(UHCIAsync) next;
uint32_t td_addr;
uint8_t done;
};
struct UHCIQueue {
uint32_t qh_addr;
uint32_t token;
UHCIState *uhci;
USBEndpoint *ep;
QTAILQ_ENTRY(UHCIQueue) next;
QTAILQ_HEAD(, UHCIAsync) asyncs;
int8_t valid;
};
typedef struct UHCIPort {
USBPort port;
uint16_t ctrl;
} UHCIPort;
struct UHCIState {
PCIDevice dev;
MemoryRegion io_bar;
USBBus bus; /* Note unused when we're a companion controller */
uint16_t cmd; /* cmd register */
uint16_t status;
uint16_t intr; /* interrupt enable register */
uint16_t frnum; /* frame number */
uint32_t fl_base_addr; /* frame list base address */
uint8_t sof_timing;
uint8_t status2; /* bit 0 and 1 are used to generate UHCI_STS_USBINT */
int64_t expire_time;
QEMUTimer *frame_timer;
QEMUBH *bh;
uint32_t frame_bytes;
uint32_t frame_bandwidth;
bool completions_only;
UHCIPort ports[NB_PORTS];
/* Interrupts that should be raised at the end of the current frame. */
uint32_t pending_int_mask;
/* Active packets */
QTAILQ_HEAD(, UHCIQueue) queues;
uint8_t num_ports_vmstate;
/* Properties */
char *masterbus;
uint32_t firstport;
uint32_t maxframes;
};
typedef struct UHCI_TD {
uint32_t link;
uint32_t ctrl; /* see TD_CTRL_xxx */
uint32_t token;
uint32_t buffer;
} UHCI_TD;
typedef struct UHCI_QH {
uint32_t link;
uint32_t el_link;
} UHCI_QH;
static void uhci_async_cancel(UHCIAsync *async);
static void uhci_queue_fill(UHCIQueue *q, UHCI_TD *td);
static void uhci_resume(void *opaque);
#define TYPE_UHCI "pci-uhci-usb"
#define UHCI(obj) OBJECT_CHECK(UHCIState, (obj), TYPE_UHCI)
static inline int32_t uhci_queue_token(UHCI_TD *td)
{
if ((td->token & (0xf << 15)) == 0) {
/* ctrl ep, cover ep and dev, not pid! */
return td->token & 0x7ff00;
} else {
/* covers ep, dev, pid -> identifies the endpoint */
return td->token & 0x7ffff;
}
}
static UHCIQueue *uhci_queue_new(UHCIState *s, uint32_t qh_addr, UHCI_TD *td,
USBEndpoint *ep)
{
UHCIQueue *queue;
queue = g_new0(UHCIQueue, 1);
queue->uhci = s;
queue->qh_addr = qh_addr;
queue->token = uhci_queue_token(td);
queue->ep = ep;
QTAILQ_INIT(&queue->asyncs);
QTAILQ_INSERT_HEAD(&s->queues, queue, next);
queue->valid = QH_VALID;
trace_usb_uhci_queue_add(queue->token);
return queue;
}
static void uhci_queue_free(UHCIQueue *queue, const char *reason)
{
UHCIState *s = queue->uhci;
UHCIAsync *async;
while (!QTAILQ_EMPTY(&queue->asyncs)) {
async = QTAILQ_FIRST(&queue->asyncs);
uhci_async_cancel(async);
}
usb_device_ep_stopped(queue->ep->dev, queue->ep);
trace_usb_uhci_queue_del(queue->token, reason);
QTAILQ_REMOVE(&s->queues, queue, next);
g_free(queue);
}
static UHCIQueue *uhci_queue_find(UHCIState *s, UHCI_TD *td)
{
uint32_t token = uhci_queue_token(td);
UHCIQueue *queue;
QTAILQ_FOREACH(queue, &s->queues, next) {
if (queue->token == token) {
return queue;
}
}
return NULL;
}
static bool uhci_queue_verify(UHCIQueue *queue, uint32_t qh_addr, UHCI_TD *td,
uint32_t td_addr, bool queuing)
{
UHCIAsync *first = QTAILQ_FIRST(&queue->asyncs);
uint32_t queue_token_addr = (queue->token >> 8) & 0x7f;
return queue->qh_addr == qh_addr &&
queue->token == uhci_queue_token(td) &&
queue_token_addr == queue->ep->dev->addr &&
(queuing || !(td->ctrl & TD_CTRL_ACTIVE) || first == NULL ||
first->td_addr == td_addr);
}
static UHCIAsync *uhci_async_alloc(UHCIQueue *queue, uint32_t td_addr)
{
UHCIAsync *async = g_new0(UHCIAsync, 1);
async->queue = queue;
async->td_addr = td_addr;
usb_packet_init(&async->packet);
trace_usb_uhci_packet_add(async->queue->token, async->td_addr);
return async;
}
static void uhci_async_free(UHCIAsync *async)
{
trace_usb_uhci_packet_del(async->queue->token, async->td_addr);
usb_packet_cleanup(&async->packet);
if (async->buf != async->static_buf) {
g_free(async->buf);
}
g_free(async);
}
static void uhci_async_link(UHCIAsync *async)
{
UHCIQueue *queue = async->queue;
QTAILQ_INSERT_TAIL(&queue->asyncs, async, next);
trace_usb_uhci_packet_link_async(async->queue->token, async->td_addr);
}
static void uhci_async_unlink(UHCIAsync *async)
{
UHCIQueue *queue = async->queue;
QTAILQ_REMOVE(&queue->asyncs, async, next);
trace_usb_uhci_packet_unlink_async(async->queue->token, async->td_addr);
}
static void uhci_async_cancel(UHCIAsync *async)
{
uhci_async_unlink(async);
trace_usb_uhci_packet_cancel(async->queue->token, async->td_addr,
async->done);
if (!async->done)
usb_cancel_packet(&async->packet);
uhci_async_free(async);
}
/*
* Mark all outstanding async packets as invalid.
* This is used for canceling them when TDs are removed by the HCD.
*/
static void uhci_async_validate_begin(UHCIState *s)
{
UHCIQueue *queue;
QTAILQ_FOREACH(queue, &s->queues, next) {
queue->valid--;
}
}
/*
* Cancel async packets that are no longer valid
*/
static void uhci_async_validate_end(UHCIState *s)
{
UHCIQueue *queue, *n;
QTAILQ_FOREACH_SAFE(queue, &s->queues, next, n) {
if (!queue->valid) {
uhci_queue_free(queue, "validate-end");
}
}
}
static void uhci_async_cancel_device(UHCIState *s, USBDevice *dev)
{
UHCIQueue *queue, *n;
QTAILQ_FOREACH_SAFE(queue, &s->queues, next, n) {
if (queue->ep->dev == dev) {
uhci_queue_free(queue, "cancel-device");
}
}
}
static void uhci_async_cancel_all(UHCIState *s)
{
UHCIQueue *queue, *nq;
QTAILQ_FOREACH_SAFE(queue, &s->queues, next, nq) {
uhci_queue_free(queue, "cancel-all");
}
}
static UHCIAsync *uhci_async_find_td(UHCIState *s, uint32_t td_addr)
{
UHCIQueue *queue;
UHCIAsync *async;
QTAILQ_FOREACH(queue, &s->queues, next) {
QTAILQ_FOREACH(async, &queue->asyncs, next) {
if (async->td_addr == td_addr) {
return async;
}
}
}
return NULL;
}
static void uhci_update_irq(UHCIState *s)
{
int level;
if (((s->status2 & 1) && (s->intr & (1 << 2))) ||
((s->status2 & 2) && (s->intr & (1 << 3))) ||
((s->status & UHCI_STS_USBERR) && (s->intr & (1 << 0))) ||
((s->status & UHCI_STS_RD) && (s->intr & (1 << 1))) ||
(s->status & UHCI_STS_HSERR) ||
(s->status & UHCI_STS_HCPERR)) {
level = 1;
} else {
level = 0;
}
pci_set_irq(&s->dev, level);
}
static void uhci_reset(DeviceState *dev)
{
PCIDevice *d = PCI_DEVICE(dev);
UHCIState *s = UHCI(d);
uint8_t *pci_conf;
int i;
UHCIPort *port;
trace_usb_uhci_reset();
pci_conf = s->dev.config;
pci_conf[0x6a] = 0x01; /* usb clock */
pci_conf[0x6b] = 0x00;
s->cmd = 0;
s->status = UHCI_STS_HCHALTED;
s->status2 = 0;
s->intr = 0;
s->fl_base_addr = 0;
s->sof_timing = 64;
for(i = 0; i < NB_PORTS; i++) {
port = &s->ports[i];
port->ctrl = 0x0080;
if (port->port.dev && port->port.dev->attached) {
usb_port_reset(&port->port);
}
}
uhci_async_cancel_all(s);
qemu_bh_cancel(s->bh);
uhci_update_irq(s);
}
static const VMStateDescription vmstate_uhci_port = {
.name = "uhci port",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(ctrl, UHCIPort),
VMSTATE_END_OF_LIST()
}
};
static int uhci_post_load(void *opaque, int version_id)
{
UHCIState *s = opaque;
if (version_id < 2) {
s->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
(NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ);
}
return 0;
}
static const VMStateDescription vmstate_uhci = {
.name = "uhci",
.version_id = 3,
.minimum_version_id = 1,
.post_load = uhci_post_load,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(dev, UHCIState),
VMSTATE_UINT8_EQUAL(num_ports_vmstate, UHCIState, NULL),
VMSTATE_STRUCT_ARRAY(ports, UHCIState, NB_PORTS, 1,
vmstate_uhci_port, UHCIPort),
VMSTATE_UINT16(cmd, UHCIState),
VMSTATE_UINT16(status, UHCIState),
VMSTATE_UINT16(intr, UHCIState),
VMSTATE_UINT16(frnum, UHCIState),
VMSTATE_UINT32(fl_base_addr, UHCIState),
VMSTATE_UINT8(sof_timing, UHCIState),
VMSTATE_UINT8(status2, UHCIState),
VMSTATE_TIMER_PTR(frame_timer, UHCIState),
VMSTATE_INT64_V(expire_time, UHCIState, 2),
VMSTATE_UINT32_V(pending_int_mask, UHCIState, 3),
VMSTATE_END_OF_LIST()
}
};
static void uhci_port_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
UHCIState *s = opaque;
trace_usb_uhci_mmio_writew(addr, val);
switch(addr) {
case 0x00:
if ((val & UHCI_CMD_RS) && !(s->cmd & UHCI_CMD_RS)) {
/* start frame processing */
trace_usb_uhci_schedule_start();
s->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
(NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ);
timer_mod(s->frame_timer, s->expire_time);
s->status &= ~UHCI_STS_HCHALTED;
} else if (!(val & UHCI_CMD_RS)) {
s->status |= UHCI_STS_HCHALTED;
}
if (val & UHCI_CMD_GRESET) {
UHCIPort *port;
int i;
/* send reset on the USB bus */
for(i = 0; i < NB_PORTS; i++) {
port = &s->ports[i];
usb_device_reset(port->port.dev);
}
uhci_reset(DEVICE(s));
return;
}
if (val & UHCI_CMD_HCRESET) {
uhci_reset(DEVICE(s));
return;
}
s->cmd = val;
if (val & UHCI_CMD_EGSM) {
if ((s->ports[0].ctrl & UHCI_PORT_RD) ||
(s->ports[1].ctrl & UHCI_PORT_RD)) {
uhci_resume(s);
}
}
break;
case 0x02:
s->status &= ~val;
/* XXX: the chip spec is not coherent, so we add a hidden
register to distinguish between IOC and SPD */
if (val & UHCI_STS_USBINT)
s->status2 = 0;
uhci_update_irq(s);
break;
case 0x04:
s->intr = val;
uhci_update_irq(s);
break;
case 0x06:
if (s->status & UHCI_STS_HCHALTED)
s->frnum = val & 0x7ff;
break;
case 0x08:
s->fl_base_addr &= 0xffff0000;
s->fl_base_addr |= val & ~0xfff;
break;
case 0x0a:
s->fl_base_addr &= 0x0000ffff;
s->fl_base_addr |= (val << 16);
break;
case 0x0c:
s->sof_timing = val & 0xff;
break;
case 0x10 ... 0x1f:
{
UHCIPort *port;
USBDevice *dev;
int n;
n = (addr >> 1) & 7;
if (n >= NB_PORTS)
return;
port = &s->ports[n];
dev = port->port.dev;
if (dev && dev->attached) {
/* port reset */
if ( (val & UHCI_PORT_RESET) &&
!(port->ctrl & UHCI_PORT_RESET) ) {
usb_device_reset(dev);
}
}
port->ctrl &= UHCI_PORT_READ_ONLY;
/* enabled may only be set if a device is connected */
if (!(port->ctrl & UHCI_PORT_CCS)) {
val &= ~UHCI_PORT_EN;
}
port->ctrl |= (val & ~UHCI_PORT_READ_ONLY);
/* some bits are reset when a '1' is written to them */
port->ctrl &= ~(val & UHCI_PORT_WRITE_CLEAR);
}
break;
}
}
static uint64_t uhci_port_read(void *opaque, hwaddr addr, unsigned size)
{
UHCIState *s = opaque;
uint32_t val;
switch(addr) {
case 0x00:
val = s->cmd;
break;
case 0x02:
val = s->status;
break;
case 0x04:
val = s->intr;
break;
case 0x06:
val = s->frnum;
break;
case 0x08:
val = s->fl_base_addr & 0xffff;
break;
case 0x0a:
val = (s->fl_base_addr >> 16) & 0xffff;
break;
case 0x0c:
val = s->sof_timing;
break;
case 0x10 ... 0x1f:
{
UHCIPort *port;
int n;
n = (addr >> 1) & 7;
if (n >= NB_PORTS)
goto read_default;
port = &s->ports[n];
val = port->ctrl;
}
break;
default:
read_default:
val = 0xff7f; /* disabled port */
break;
}
trace_usb_uhci_mmio_readw(addr, val);
return val;
}
/* signal resume if controller suspended */
static void uhci_resume (void *opaque)
{
UHCIState *s = (UHCIState *)opaque;
if (!s)
return;
if (s->cmd & UHCI_CMD_EGSM) {
s->cmd |= UHCI_CMD_FGR;
s->status |= UHCI_STS_RD;
uhci_update_irq(s);
}
}
static void uhci_attach(USBPort *port1)
{
UHCIState *s = port1->opaque;
UHCIPort *port = &s->ports[port1->index];
/* set connect status */
port->ctrl |= UHCI_PORT_CCS | UHCI_PORT_CSC;
/* update speed */
if (port->port.dev->speed == USB_SPEED_LOW) {
port->ctrl |= UHCI_PORT_LSDA;
} else {
port->ctrl &= ~UHCI_PORT_LSDA;
}
uhci_resume(s);
}
static void uhci_detach(USBPort *port1)
{
UHCIState *s = port1->opaque;
UHCIPort *port = &s->ports[port1->index];
uhci_async_cancel_device(s, port1->dev);
/* set connect status */
if (port->ctrl & UHCI_PORT_CCS) {
port->ctrl &= ~UHCI_PORT_CCS;
port->ctrl |= UHCI_PORT_CSC;
}
/* disable port */
if (port->ctrl & UHCI_PORT_EN) {
port->ctrl &= ~UHCI_PORT_EN;
port->ctrl |= UHCI_PORT_ENC;
}
uhci_resume(s);
}
static void uhci_child_detach(USBPort *port1, USBDevice *child)
{
UHCIState *s = port1->opaque;
uhci_async_cancel_device(s, child);
}
static void uhci_wakeup(USBPort *port1)
{
UHCIState *s = port1->opaque;
UHCIPort *port = &s->ports[port1->index];
if (port->ctrl & UHCI_PORT_SUSPEND && !(port->ctrl & UHCI_PORT_RD)) {
port->ctrl |= UHCI_PORT_RD;
uhci_resume(s);
}
}
static USBDevice *uhci_find_device(UHCIState *s, uint8_t addr)
{
USBDevice *dev;
int i;
for (i = 0; i < NB_PORTS; i++) {
UHCIPort *port = &s->ports[i];
if (!(port->ctrl & UHCI_PORT_EN)) {
continue;
}
dev = usb_find_device(&port->port, addr);
if (dev != NULL) {
return dev;
}
}
return NULL;
}
static void uhci_read_td(UHCIState *s, UHCI_TD *td, uint32_t link)
{
pci_dma_read(&s->dev, link & ~0xf, td, sizeof(*td));
le32_to_cpus(&td->link);
le32_to_cpus(&td->ctrl);
le32_to_cpus(&td->token);
le32_to_cpus(&td->buffer);
}
static int uhci_handle_td_error(UHCIState *s, UHCI_TD *td, uint32_t td_addr,
int status, uint32_t *int_mask)
{
uint32_t queue_token = uhci_queue_token(td);
int ret;
switch (status) {
case USB_RET_NAK:
td->ctrl |= TD_CTRL_NAK;
return TD_RESULT_NEXT_QH;
case USB_RET_STALL:
td->ctrl |= TD_CTRL_STALL;
trace_usb_uhci_packet_complete_stall(queue_token, td_addr);
ret = TD_RESULT_NEXT_QH;
break;
case USB_RET_BABBLE:
td->ctrl |= TD_CTRL_BABBLE | TD_CTRL_STALL;
/* frame interrupted */
trace_usb_uhci_packet_complete_babble(queue_token, td_addr);
ret = TD_RESULT_STOP_FRAME;
break;
case USB_RET_IOERROR:
case USB_RET_NODEV:
default:
td->ctrl |= TD_CTRL_TIMEOUT;
td->ctrl &= ~(3 << TD_CTRL_ERROR_SHIFT);
trace_usb_uhci_packet_complete_error(queue_token, td_addr);
ret = TD_RESULT_NEXT_QH;
break;
}
td->ctrl &= ~TD_CTRL_ACTIVE;
s->status |= UHCI_STS_USBERR;
if (td->ctrl & TD_CTRL_IOC) {
*int_mask |= 0x01;
}
uhci_update_irq(s);
return ret;
}
static int uhci_complete_td(UHCIState *s, UHCI_TD *td, UHCIAsync *async, uint32_t *int_mask)
{
int len = 0, max_len;
uint8_t pid;
max_len = ((td->token >> 21) + 1) & 0x7ff;
pid = td->token & 0xff;
if (td->ctrl & TD_CTRL_IOS)
td->ctrl &= ~TD_CTRL_ACTIVE;
if (async->packet.status != USB_RET_SUCCESS) {
return uhci_handle_td_error(s, td, async->td_addr,
async->packet.status, int_mask);
}
len = async->packet.actual_length;
td->ctrl = (td->ctrl & ~0x7ff) | ((len - 1) & 0x7ff);
/* The NAK bit may have been set by a previous frame, so clear it
here. The docs are somewhat unclear, but win2k relies on this
behavior. */
td->ctrl &= ~(TD_CTRL_ACTIVE | TD_CTRL_NAK);
if (td->ctrl & TD_CTRL_IOC)
*int_mask |= 0x01;
if (pid == USB_TOKEN_IN) {
pci_dma_write(&s->dev, td->buffer, async->buf, len);
if ((td->ctrl & TD_CTRL_SPD) && len < max_len) {
*int_mask |= 0x02;
/* short packet: do not update QH */
trace_usb_uhci_packet_complete_shortxfer(async->queue->token,
async->td_addr);
return TD_RESULT_NEXT_QH;
}
}
/* success */
trace_usb_uhci_packet_complete_success(async->queue->token,
async->td_addr);
return TD_RESULT_COMPLETE;
}
static int uhci_handle_td(UHCIState *s, UHCIQueue *q, uint32_t qh_addr,
UHCI_TD *td, uint32_t td_addr, uint32_t *int_mask)
{
int ret, max_len;
bool spd;
bool queuing = (q != NULL);
uint8_t pid = td->token & 0xff;
UHCIAsync *async;
async = uhci_async_find_td(s, td_addr);
if (async) {
if (uhci_queue_verify(async->queue, qh_addr, td, td_addr, queuing)) {
assert(q == NULL || q == async->queue);
q = async->queue;
} else {
uhci_queue_free(async->queue, "guest re-used pending td");
async = NULL;
}
}
if (q == NULL) {
q = uhci_queue_find(s, td);
if (q && !uhci_queue_verify(q, qh_addr, td, td_addr, queuing)) {
uhci_queue_free(q, "guest re-used qh");
q = NULL;
}
}
if (q) {
q->valid = QH_VALID;
}
/* Is active ? */
if (!(td->ctrl & TD_CTRL_ACTIVE)) {
if (async) {
/* Guest marked a pending td non-active, cancel the queue */
uhci_queue_free(async->queue, "pending td non-active");
}
/*
* ehci11d spec page 22: "Even if the Active bit in the TD is already
* cleared when the TD is fetched ... an IOC interrupt is generated"
*/
if (td->ctrl & TD_CTRL_IOC) {
*int_mask |= 0x01;
}
return TD_RESULT_NEXT_QH;
}
switch (pid) {
case USB_TOKEN_OUT:
case USB_TOKEN_SETUP:
case USB_TOKEN_IN:
break;
default:
/* invalid pid : frame interrupted */
s->status |= UHCI_STS_HCPERR;
s->cmd &= ~UHCI_CMD_RS;
uhci_update_irq(s);
return TD_RESULT_STOP_FRAME;
}
if (async) {
if (queuing) {
/* we are busy filling the queue, we are not prepared
to consume completed packages then, just leave them
in async state */
return TD_RESULT_ASYNC_CONT;
}
if (!async->done) {
UHCI_TD last_td;
UHCIAsync *last = QTAILQ_LAST(&async->queue->asyncs);
/*
* While we are waiting for the current td to complete, the guest
* may have added more tds to the queue. Note we re-read the td
* rather then caching it, as we want to see guest made changes!
*/
uhci_read_td(s, &last_td, last->td_addr);
uhci_queue_fill(async->queue, &last_td);
return TD_RESULT_ASYNC_CONT;
}
uhci_async_unlink(async);
goto done;
}
if (s->completions_only) {
return TD_RESULT_ASYNC_CONT;
}
/* Allocate new packet */
if (q == NULL) {
USBDevice *dev;
USBEndpoint *ep;
dev = uhci_find_device(s, (td->token >> 8) & 0x7f);
if (dev == NULL) {
return uhci_handle_td_error(s, td, td_addr, USB_RET_NODEV,
int_mask);
}
ep = usb_ep_get(dev, pid, (td->token >> 15) & 0xf);
q = uhci_queue_new(s, qh_addr, td, ep);
}
async = uhci_async_alloc(q, td_addr);
max_len = ((td->token >> 21) + 1) & 0x7ff;
spd = (pid == USB_TOKEN_IN && (td->ctrl & TD_CTRL_SPD) != 0);
usb_packet_setup(&async->packet, pid, q->ep, 0, td_addr, spd,
(td->ctrl & TD_CTRL_IOC) != 0);
if (max_len <= sizeof(async->static_buf)) {
async->buf = async->static_buf;
} else {
async->buf = g_malloc(max_len);
}
usb_packet_addbuf(&async->packet, async->buf, max_len);
switch(pid) {
case USB_TOKEN_OUT:
case USB_TOKEN_SETUP:
pci_dma_read(&s->dev, td->buffer, async->buf, max_len);
usb_handle_packet(q->ep->dev, &async->packet);
if (async->packet.status == USB_RET_SUCCESS) {
async->packet.actual_length = max_len;
}
break;
case USB_TOKEN_IN:
usb_handle_packet(q->ep->dev, &async->packet);
break;
default:
abort(); /* Never to execute */
}
if (async->packet.status == USB_RET_ASYNC) {
uhci_async_link(async);
if (!queuing) {
uhci_queue_fill(q, td);
}
return TD_RESULT_ASYNC_START;
}
done:
ret = uhci_complete_td(s, td, async, int_mask);
uhci_async_free(async);
return ret;
}
static void uhci_async_complete(USBPort *port, USBPacket *packet)
{
UHCIAsync *async = container_of(packet, UHCIAsync, packet);
UHCIState *s = async->queue->uhci;
if (packet->status == USB_RET_REMOVE_FROM_QUEUE) {
uhci_async_cancel(async);
return;
}
async->done = 1;
/* Force processing of this packet *now*, needed for migration */
s->completions_only = true;
qemu_bh_schedule(s->bh);
}
static int is_valid(uint32_t link)
{
return (link & 1) == 0;
}
static int is_qh(uint32_t link)
{
return (link & 2) != 0;
}
static int depth_first(uint32_t link)
{
return (link & 4) != 0;
}
/* QH DB used for detecting QH loops */
#define UHCI_MAX_QUEUES 128
typedef struct {
uint32_t addr[UHCI_MAX_QUEUES];
int count;
} QhDb;
static void qhdb_reset(QhDb *db)
{
db->count = 0;
}
/* Add QH to DB. Returns 1 if already present or DB is full. */
static int qhdb_insert(QhDb *db, uint32_t addr)
{
int i;
for (i = 0; i < db->count; i++)
if (db->addr[i] == addr)
return 1;
if (db->count >= UHCI_MAX_QUEUES)
return 1;
db->addr[db->count++] = addr;
return 0;
}
static void uhci_queue_fill(UHCIQueue *q, UHCI_TD *td)
{
uint32_t int_mask = 0;
uint32_t plink = td->link;
UHCI_TD ptd;
int ret;
while (is_valid(plink)) {
uhci_read_td(q->uhci, &ptd, plink);
if (!(ptd.ctrl & TD_CTRL_ACTIVE)) {
break;
}
if (uhci_queue_token(&ptd) != q->token) {
break;
}
trace_usb_uhci_td_queue(plink & ~0xf, ptd.ctrl, ptd.token);
ret = uhci_handle_td(q->uhci, q, q->qh_addr, &ptd, plink, &int_mask);
if (ret == TD_RESULT_ASYNC_CONT) {
break;
}
assert(ret == TD_RESULT_ASYNC_START);
assert(int_mask == 0);
plink = ptd.link;
}
usb_device_flush_ep_queue(q->ep->dev, q->ep);
}
static void uhci_process_frame(UHCIState *s)
{
uint32_t frame_addr, link, old_td_ctrl, val, int_mask;
uint32_t curr_qh, td_count = 0;
int cnt, ret;
UHCI_TD td;
UHCI_QH qh;
QhDb qhdb;
frame_addr = s->fl_base_addr + ((s->frnum & 0x3ff) << 2);
pci_dma_read(&s->dev, frame_addr, &link, 4);
le32_to_cpus(&link);
int_mask = 0;
curr_qh = 0;
qhdb_reset(&qhdb);
for (cnt = FRAME_MAX_LOOPS; is_valid(link) && cnt; cnt--) {
if (!s->completions_only && s->frame_bytes >= s->frame_bandwidth) {
/* We've reached the usb 1.1 bandwidth, which is
1280 bytes/frame, stop processing */
trace_usb_uhci_frame_stop_bandwidth();
break;
}
if (is_qh(link)) {
/* QH */
trace_usb_uhci_qh_load(link & ~0xf);
if (qhdb_insert(&qhdb, link)) {
/*
* We're going in circles. Which is not a bug because
* HCD is allowed to do that as part of the BW management.
*
* Stop processing here if no transaction has been done
* since we've been here last time.
*/
if (td_count == 0) {
trace_usb_uhci_frame_loop_stop_idle();
break;
} else {
trace_usb_uhci_frame_loop_continue();
td_count = 0;
qhdb_reset(&qhdb);
qhdb_insert(&qhdb, link);
}
}
pci_dma_read(&s->dev, link & ~0xf, &qh, sizeof(qh));
le32_to_cpus(&qh.link);
le32_to_cpus(&qh.el_link);
if (!is_valid(qh.el_link)) {
/* QH w/o elements */
curr_qh = 0;
link = qh.link;
} else {
/* QH with elements */
curr_qh = link;
link = qh.el_link;
}
continue;
}
/* TD */
uhci_read_td(s, &td, link);
trace_usb_uhci_td_load(curr_qh & ~0xf, link & ~0xf, td.ctrl, td.token);
old_td_ctrl = td.ctrl;
ret = uhci_handle_td(s, NULL, curr_qh, &td, link, &int_mask);
if (old_td_ctrl != td.ctrl) {
/* update the status bits of the TD */
val = cpu_to_le32(td.ctrl);
pci_dma_write(&s->dev, (link & ~0xf) + 4, &val, sizeof(val));
}
switch (ret) {
case TD_RESULT_STOP_FRAME: /* interrupted frame */
goto out;
case TD_RESULT_NEXT_QH:
case TD_RESULT_ASYNC_CONT:
trace_usb_uhci_td_nextqh(curr_qh & ~0xf, link & ~0xf);
link = curr_qh ? qh.link : td.link;
continue;
case TD_RESULT_ASYNC_START:
trace_usb_uhci_td_async(curr_qh & ~0xf, link & ~0xf);
link = curr_qh ? qh.link : td.link;
continue;
case TD_RESULT_COMPLETE:
trace_usb_uhci_td_complete(curr_qh & ~0xf, link & ~0xf);
link = td.link;
td_count++;
s->frame_bytes += (td.ctrl & 0x7ff) + 1;
if (curr_qh) {
/* update QH element link */
qh.el_link = link;
val = cpu_to_le32(qh.el_link);
pci_dma_write(&s->dev, (curr_qh & ~0xf) + 4, &val, sizeof(val));
if (!depth_first(link)) {
/* done with this QH */
curr_qh = 0;
link = qh.link;
}
}
break;
default:
assert(!"unknown return code");
}
/* go to the next entry */
}
out:
s->pending_int_mask |= int_mask;
}
static void uhci_bh(void *opaque)
{
UHCIState *s = opaque;
uhci_process_frame(s);
}
static void uhci_frame_timer(void *opaque)
{
UHCIState *s = opaque;
uint64_t t_now, t_last_run;
int i, frames;
const uint64_t frame_t = NANOSECONDS_PER_SECOND / FRAME_TIMER_FREQ;
s->completions_only = false;
qemu_bh_cancel(s->bh);
if (!(s->cmd & UHCI_CMD_RS)) {
/* Full stop */
trace_usb_uhci_schedule_stop();
timer_del(s->frame_timer);
uhci_async_cancel_all(s);
/* set hchalted bit in status - UHCI11D 2.1.2 */
s->status |= UHCI_STS_HCHALTED;
return;
}
/* We still store expire_time in our state, for migration */
t_last_run = s->expire_time - frame_t;
t_now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
/* Process up to MAX_FRAMES_PER_TICK frames */
frames = (t_now - t_last_run) / frame_t;
if (frames > s->maxframes) {
int skipped = frames - s->maxframes;
s->expire_time += skipped * frame_t;
s->frnum = (s->frnum + skipped) & 0x7ff;
frames -= skipped;
}
if (frames > MAX_FRAMES_PER_TICK) {
frames = MAX_FRAMES_PER_TICK;
}
for (i = 0; i < frames; i++) {
s->frame_bytes = 0;
trace_usb_uhci_frame_start(s->frnum);
uhci_async_validate_begin(s);
uhci_process_frame(s);
uhci_async_validate_end(s);
/* The spec says frnum is the frame currently being processed, and
* the guest must look at frnum - 1 on interrupt, so inc frnum now */
s->frnum = (s->frnum + 1) & 0x7ff;
s->expire_time += frame_t;
}
/* Complete the previous frame(s) */
if (s->pending_int_mask) {
s->status2 |= s->pending_int_mask;
s->status |= UHCI_STS_USBINT;
uhci_update_irq(s);
}
s->pending_int_mask = 0;
timer_mod(s->frame_timer, t_now + frame_t);
}
static const MemoryRegionOps uhci_ioport_ops = {
.read = uhci_port_read,
.write = uhci_port_write,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 2,
.impl.max_access_size = 2,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static USBPortOps uhci_port_ops = {
.attach = uhci_attach,
.detach = uhci_detach,
.child_detach = uhci_child_detach,
.wakeup = uhci_wakeup,
.complete = uhci_async_complete,
};
static USBBusOps uhci_bus_ops = {
};
static void usb_uhci_common_realize(PCIDevice *dev, Error **errp)
{
Error *err = NULL;
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
UHCIPCIDeviceClass *u = container_of(pc, UHCIPCIDeviceClass, parent_class);
UHCIState *s = UHCI(dev);
uint8_t *pci_conf = s->dev.config;
int i;
pci_conf[PCI_CLASS_PROG] = 0x00;
/* TODO: reset value should be 0. */
pci_conf[USB_SBRN] = USB_RELEASE_1; // release number
pci_config_set_interrupt_pin(pci_conf, u->info.irq_pin + 1);
if (s->masterbus) {
USBPort *ports[NB_PORTS];
for(i = 0; i < NB_PORTS; i++) {
ports[i] = &s->ports[i].port;
}
usb_register_companion(s->masterbus, ports, NB_PORTS,
s->firstport, s, &uhci_port_ops,
USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL,
&err);
if (err) {
error_propagate(errp, err);
return;
}
} else {
usb_bus_new(&s->bus, sizeof(s->bus), &uhci_bus_ops, DEVICE(dev));
for (i = 0; i < NB_PORTS; i++) {
usb_register_port(&s->bus, &s->ports[i].port, s, i, &uhci_port_ops,
USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
}
}
s->bh = qemu_bh_new(uhci_bh, s);
s->frame_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, uhci_frame_timer, s);
s->num_ports_vmstate = NB_PORTS;
QTAILQ_INIT(&s->queues);
memory_region_init_io(&s->io_bar, OBJECT(s), &uhci_ioport_ops, s,
"uhci", 0x20);
/* Use region 4 for consistency with real hardware. BSD guests seem
to rely on this. */
pci_register_bar(&s->dev, 4, PCI_BASE_ADDRESS_SPACE_IO, &s->io_bar);
}
static void usb_uhci_vt82c686b_realize(PCIDevice *dev, Error **errp)
{
UHCIState *s = UHCI(dev);
uint8_t *pci_conf = s->dev.config;
/* USB misc control 1/2 */
pci_set_long(pci_conf + 0x40,0x00001000);
/* PM capability */
pci_set_long(pci_conf + 0x80,0x00020001);
/* USB legacy support */
pci_set_long(pci_conf + 0xc0,0x00002000);
usb_uhci_common_realize(dev, errp);
}
static void usb_uhci_exit(PCIDevice *dev)
{
UHCIState *s = UHCI(dev);
trace_usb_uhci_exit();
if (s->frame_timer) {
timer_del(s->frame_timer);
timer_free(s->frame_timer);
s->frame_timer = NULL;
}
if (s->bh) {
qemu_bh_delete(s->bh);
}
uhci_async_cancel_all(s);
if (!s->masterbus) {
usb_bus_release(&s->bus);
}
}
static Property uhci_properties_companion[] = {
DEFINE_PROP_STRING("masterbus", UHCIState, masterbus),
DEFINE_PROP_UINT32("firstport", UHCIState, firstport, 0),
DEFINE_PROP_UINT32("bandwidth", UHCIState, frame_bandwidth, 1280),
DEFINE_PROP_UINT32("maxframes", UHCIState, maxframes, 128),
DEFINE_PROP_END_OF_LIST(),
};
static Property uhci_properties_standalone[] = {
DEFINE_PROP_UINT32("bandwidth", UHCIState, frame_bandwidth, 1280),
DEFINE_PROP_UINT32("maxframes", UHCIState, maxframes, 128),
DEFINE_PROP_END_OF_LIST(),
};
static void uhci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->class_id = PCI_CLASS_SERIAL_USB;
dc->vmsd = &vmstate_uhci;
dc->reset = uhci_reset;
set_bit(DEVICE_CATEGORY_USB, dc->categories);
}
static const TypeInfo uhci_pci_type_info = {
.name = TYPE_UHCI,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(UHCIState),
.class_size = sizeof(UHCIPCIDeviceClass),
.abstract = true,
.class_init = uhci_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void uhci_data_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
UHCIPCIDeviceClass *u = container_of(k, UHCIPCIDeviceClass, parent_class);
UHCIInfo *info = data;
k->realize = info->realize ? info->realize : usb_uhci_common_realize;
k->exit = info->unplug ? usb_uhci_exit : NULL;
k->vendor_id = info->vendor_id;
k->device_id = info->device_id;
k->revision = info->revision;
if (!info->unplug) {
/* uhci controllers in companion setups can't be hotplugged */
dc->hotpluggable = false;
device_class_set_props(dc, uhci_properties_companion);
} else {
device_class_set_props(dc, uhci_properties_standalone);
}
u->info = *info;
}
static UHCIInfo uhci_info[] = {
{
.name = "piix3-usb-uhci",
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82371SB_2,
.revision = 0x01,
.irq_pin = 3,
.unplug = true,
},{
.name = "piix4-usb-uhci",
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82371AB_2,
.revision = 0x01,
.irq_pin = 3,
.unplug = true,
},{
.name = "vt82c686b-usb-uhci",
.vendor_id = PCI_VENDOR_ID_VIA,
.device_id = PCI_DEVICE_ID_VIA_UHCI,
.revision = 0x01,
.irq_pin = 3,
.realize = usb_uhci_vt82c686b_realize,
.unplug = true,
},{
.name = "ich9-usb-uhci1", /* 00:1d.0 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI1,
.revision = 0x03,
.irq_pin = 0,
.unplug = false,
},{
.name = "ich9-usb-uhci2", /* 00:1d.1 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI2,
.revision = 0x03,
.irq_pin = 1,
.unplug = false,
},{
.name = "ich9-usb-uhci3", /* 00:1d.2 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI3,
.revision = 0x03,
.irq_pin = 2,
.unplug = false,
},{
.name = "ich9-usb-uhci4", /* 00:1a.0 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI4,
.revision = 0x03,
.irq_pin = 0,
.unplug = false,
},{
.name = "ich9-usb-uhci5", /* 00:1a.1 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI5,
.revision = 0x03,
.irq_pin = 1,
.unplug = false,
},{
.name = "ich9-usb-uhci6", /* 00:1a.2 */
.vendor_id = PCI_VENDOR_ID_INTEL,
.device_id = PCI_DEVICE_ID_INTEL_82801I_UHCI6,
.revision = 0x03,
.irq_pin = 2,
.unplug = false,
}
};
static void uhci_register_types(void)
{
TypeInfo uhci_type_info = {
.parent = TYPE_UHCI,
.class_init = uhci_data_class_init,
};
int i;
type_register_static(&uhci_pci_type_info);
for (i = 0; i < ARRAY_SIZE(uhci_info); i++) {
uhci_type_info.name = uhci_info[i].name;
uhci_type_info.class_data = uhci_info + i;
type_register(&uhci_type_info);
}
}
type_init(uhci_register_types)
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