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// Code for handling UHCI USB controllers.
//
// Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "util.h" // dprintf
#include "pci.h" // pci_bdf_to_bus
#include "config.h" // CONFIG_*
#include "ioport.h" // outw
#include "usb-uhci.h" // USBLEGSUP
#include "pci_regs.h" // PCI_BASE_ADDRESS_4
#include "usb.h" // struct usb_s
#include "farptr.h" // GET_FLATPTR
struct usb_uhci_s {
struct usb_s usb;
u16 iobase;
struct uhci_qh *control_qh, *bulk_qh;
struct uhci_framelist *framelist;
};
/****************************************************************
* Root hub
****************************************************************/
// Check if device attached to a given port
static int
uhci_hub_detect(struct usbhub_s *hub, u32 port)
{
struct usb_uhci_s *cntl = container_of(hub->cntl, struct usb_uhci_s, usb);
u16 ioport = cntl->iobase + USBPORTSC1 + port * 2;
u16 status = inw(ioport);
if (!(status & USBPORTSC_CCS))
// No device
return -1;
// XXX - if just powered up, need to wait for USB_TIME_ATTDB?
// Begin reset on port
outw(USBPORTSC_PR, ioport);
msleep(USB_TIME_DRSTR);
return 0;
}
// Reset device on port
static int
uhci_hub_reset(struct usbhub_s *hub, u32 port)
{
struct usb_uhci_s *cntl = container_of(hub->cntl, struct usb_uhci_s, usb);
u16 ioport = cntl->iobase + USBPORTSC1 + port * 2;
// Finish reset on port
outw(0, ioport);
udelay(6); // 64 high-speed bit times
u16 status = inw(ioport);
if (!(status & USBPORTSC_CCS))
// No longer connected
return -1;
outw(USBPORTSC_PE, ioport);
return !!(status & USBPORTSC_LSDA);
}
// Disable port
static void
uhci_hub_disconnect(struct usbhub_s *hub, u32 port)
{
struct usb_uhci_s *cntl = container_of(hub->cntl, struct usb_uhci_s, usb);
u16 ioport = cntl->iobase + USBPORTSC1 + port * 2;
outw(0, ioport);
}
static struct usbhub_op_s uhci_HubOp = {
.detect = uhci_hub_detect,
.reset = uhci_hub_reset,
.disconnect = uhci_hub_disconnect,
};
// Find any devices connected to the root hub.
static int
check_uhci_ports(struct usb_uhci_s *cntl)
{
ASSERT32FLAT();
struct usbhub_s hub;
memset(&hub, 0, sizeof(hub));
hub.cntl = &cntl->usb;
hub.portcount = 2;
hub.op = &uhci_HubOp;
usb_enumerate(&hub);
return hub.devcount;
}
/****************************************************************
* Setup
****************************************************************/
static void
reset_uhci(struct usb_uhci_s *cntl, u16 bdf)
{
// XXX - don't reset if not needed.
// Reset PIRQ and SMI
pci_config_writew(bdf, USBLEGSUP, USBLEGSUP_RWC);
// Reset the HC
outw(USBCMD_HCRESET, cntl->iobase + USBCMD);
udelay(5);
// Disable interrupts and commands (just to be safe).
outw(0, cntl->iobase + USBINTR);
outw(0, cntl->iobase + USBCMD);
}
static void
configure_uhci(void *data)
{
struct usb_uhci_s *cntl = data;
// Allocate ram for schedule storage
struct uhci_td *term_td = malloc_high(sizeof(*term_td));
struct uhci_framelist *fl = memalign_high(sizeof(*fl), sizeof(*fl));
struct uhci_qh *intr_qh = malloc_high(sizeof(*intr_qh));
struct uhci_qh *term_qh = malloc_high(sizeof(*term_qh));
if (!term_td || !fl || !intr_qh || !term_qh) {
warn_noalloc();
goto fail;
}
// Work around for PIIX errata
memset(term_td, 0, sizeof(*term_td));
term_td->link = UHCI_PTR_TERM;
term_td->token = (uhci_explen(0) | (0x7f << TD_TOKEN_DEVADDR_SHIFT)
| USB_PID_IN);
memset(term_qh, 0, sizeof(*term_qh));
term_qh->element = (u32)term_td;
term_qh->link = UHCI_PTR_TERM;
// Set schedule to point to primary intr queue head
memset(intr_qh, 0, sizeof(*intr_qh));
intr_qh->element = UHCI_PTR_TERM;
intr_qh->link = (u32)term_qh | UHCI_PTR_QH;
int i;
for (i=0; i<ARRAY_SIZE(fl->links); i++)
fl->links[i] = (u32)intr_qh | UHCI_PTR_QH;
cntl->framelist = fl;
cntl->control_qh = cntl->bulk_qh = intr_qh;
barrier();
// Set the frame length to the default: 1 ms exactly
outb(USBSOF_DEFAULT, cntl->iobase + USBSOF);
// Store the frame list base address
outl((u32)fl->links, cntl->iobase + USBFLBASEADD);
// Set the current frame number
outw(0, cntl->iobase + USBFRNUM);
// Mark as configured and running with a 64-byte max packet.
outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, cntl->iobase + USBCMD);
// Find devices
int count = check_uhci_ports(cntl);
free_pipe(cntl->usb.defaultpipe);
if (count)
// Success
return;
// No devices found - shutdown and free controller.
outw(0, cntl->iobase + USBCMD);
fail:
free(term_td);
free(fl);
free(intr_qh);
free(term_qh);
free(cntl);
}
void
uhci_init(u16 bdf, int busid)
{
if (! CONFIG_USB_UHCI)
return;
struct usb_uhci_s *cntl = malloc_tmphigh(sizeof(*cntl));
memset(cntl, 0, sizeof(*cntl));
cntl->usb.busid = busid;
cntl->usb.type = USB_TYPE_UHCI;
cntl->iobase = (pci_config_readl(bdf, PCI_BASE_ADDRESS_4)
& PCI_BASE_ADDRESS_IO_MASK);
dprintf(1, "UHCI init on dev %02x:%02x.%x (io=%x)\n"
, pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf)
, pci_bdf_to_fn(bdf), cntl->iobase);
pci_config_maskw(bdf, PCI_COMMAND, 0, PCI_COMMAND_MASTER);
reset_uhci(cntl, bdf);
run_thread(configure_uhci, cntl);
}
/****************************************************************
* End point communication
****************************************************************/
static int
wait_qh(struct usb_uhci_s *cntl, struct uhci_qh *qh)
{
// XXX - 500ms just a guess
u64 end = calc_future_tsc(500);
for (;;) {
if (qh->element & UHCI_PTR_TERM)
return 0;
if (check_time(end)) {
warn_timeout();
struct uhci_td *td = (void*)(qh->element & ~UHCI_PTR_BITS);
dprintf(1, "Timeout on wait_qh %p (td=%p s=%x c=%x/%x)\n"
, qh, td, td->status
, inw(cntl->iobase + USBCMD)
, inw(cntl->iobase + USBSTS));
return -1;
}
yield();
}
}
// Wait for next USB frame to start - for ensuring safe memory release.
static void
uhci_waittick(u16 iobase)
{
barrier();
u16 startframe = inw(iobase + USBFRNUM);
u64 end = calc_future_tsc(1000 * 5);
for (;;) {
if (inw(iobase + USBFRNUM) != startframe)
break;
if (check_time(end)) {
warn_timeout();
return;
}
yield();
}
}
struct uhci_pipe {
struct uhci_qh qh;
struct uhci_td *next_td;
struct usb_pipe pipe;
u16 iobase;
u8 toggle;
};
void
uhci_free_pipe(struct usb_pipe *p)
{
if (! CONFIG_USB_UHCI)
return;
dprintf(7, "uhci_free_pipe %p\n", p);
struct uhci_pipe *pipe = container_of(p, struct uhci_pipe, pipe);
struct usb_uhci_s *cntl = container_of(
pipe->pipe.cntl, struct usb_uhci_s, usb);
struct uhci_qh *pos = (void*)(cntl->framelist->links[0] & ~UHCI_PTR_BITS);
for (;;) {
u32 link = pos->link;
if (link == UHCI_PTR_TERM) {
// Not found?! Exit without freeing.
warn_internalerror();
return;
}
struct uhci_qh *next = (void*)(link & ~UHCI_PTR_BITS);
if (next == &pipe->qh) {
pos->link = next->link;
if (cntl->control_qh == next)
cntl->control_qh = pos;
if (cntl->bulk_qh == next)
cntl->bulk_qh = pos;
uhci_waittick(cntl->iobase);
free(pipe);
return;
}
pos = next;
}
}
struct usb_pipe *
uhci_alloc_control_pipe(struct usb_pipe *dummy)
{
if (! CONFIG_USB_UHCI)
return NULL;
struct usb_uhci_s *cntl = container_of(
dummy->cntl, struct usb_uhci_s, usb);
dprintf(7, "uhci_alloc_control_pipe %p\n", &cntl->usb);
// Allocate a queue head.
struct uhci_pipe *pipe = malloc_tmphigh(sizeof(*pipe));
if (!pipe) {
warn_noalloc();
return NULL;
}
memset(pipe, 0, sizeof(*pipe));
memcpy(&pipe->pipe, dummy, sizeof(pipe->pipe));
pipe->qh.element = UHCI_PTR_TERM;
pipe->iobase = cntl->iobase;
// Add queue head to controller list.
struct uhci_qh *control_qh = cntl->control_qh;
pipe->qh.link = control_qh->link;
barrier();
control_qh->link = (u32)&pipe->qh | UHCI_PTR_QH;
if (cntl->bulk_qh == control_qh)
cntl->bulk_qh = &pipe->qh;
return &pipe->pipe;
}
int
uhci_control(struct usb_pipe *p, int dir, const void *cmd, int cmdsize
, void *data, int datasize)
{
ASSERT32FLAT();
if (! CONFIG_USB_UHCI)
return -1;
dprintf(5, "uhci_control %p\n", p);
struct uhci_pipe *pipe = container_of(p, struct uhci_pipe, pipe);
struct usb_uhci_s *cntl = container_of(
pipe->pipe.cntl, struct usb_uhci_s, usb);
int maxpacket = pipe->pipe.maxpacket;
int lowspeed = pipe->pipe.speed;
int devaddr = pipe->pipe.devaddr | (pipe->pipe.ep << 7);
// Setup transfer descriptors
int count = 2 + DIV_ROUND_UP(datasize, maxpacket);
struct uhci_td *tds = malloc_tmphigh(sizeof(*tds) * count);
if (!tds) {
warn_noalloc();
return -1;
}
tds[0].link = (u32)&tds[1] | UHCI_PTR_DEPTH;
tds[0].status = (uhci_maxerr(3) | (lowspeed ? TD_CTRL_LS : 0)
| TD_CTRL_ACTIVE);
tds[0].token = (uhci_explen(cmdsize) | (devaddr << TD_TOKEN_DEVADDR_SHIFT)
| USB_PID_SETUP);
tds[0].buffer = (void*)cmd;
int toggle = TD_TOKEN_TOGGLE;
int i;
for (i=1; i<count-1; i++) {
tds[i].link = (u32)&tds[i+1] | UHCI_PTR_DEPTH;
tds[i].status = (uhci_maxerr(3) | (lowspeed ? TD_CTRL_LS : 0)
| TD_CTRL_ACTIVE);
int len = (i == count-2 ? (datasize - (i-1)*maxpacket) : maxpacket);
tds[i].token = (uhci_explen(len) | toggle
| (devaddr << TD_TOKEN_DEVADDR_SHIFT)
| (dir ? USB_PID_IN : USB_PID_OUT));
tds[i].buffer = data + (i-1) * maxpacket;
toggle ^= TD_TOKEN_TOGGLE;
}
tds[i].link = UHCI_PTR_TERM;
tds[i].status = (uhci_maxerr(0) | (lowspeed ? TD_CTRL_LS : 0)
| TD_CTRL_ACTIVE);
tds[i].token = (uhci_explen(0) | TD_TOKEN_TOGGLE
| (devaddr << TD_TOKEN_DEVADDR_SHIFT)
| (dir ? USB_PID_OUT : USB_PID_IN));
tds[i].buffer = 0;
// Transfer data
barrier();
pipe->qh.element = (u32)&tds[0];
int ret = wait_qh(cntl, &pipe->qh);
if (ret) {
pipe->qh.element = UHCI_PTR_TERM;
uhci_waittick(pipe->iobase);
}
free(tds);
return ret;
}
struct usb_pipe *
uhci_alloc_bulk_pipe(struct usb_pipe *dummy)
{
if (! CONFIG_USB_UHCI)
return NULL;
struct usb_uhci_s *cntl = container_of(
dummy->cntl, struct usb_uhci_s, usb);
dprintf(7, "uhci_alloc_bulk_pipe %p\n", &cntl->usb);
// Allocate a queue head.
struct uhci_pipe *pipe = malloc_low(sizeof(*pipe));
if (!pipe) {
warn_noalloc();
return NULL;
}
memset(pipe, 0, sizeof(*pipe));
memcpy(&pipe->pipe, dummy, sizeof(pipe->pipe));
pipe->qh.element = UHCI_PTR_TERM;
pipe->iobase = cntl->iobase;
// Add queue head to controller list.
struct uhci_qh *bulk_qh = cntl->bulk_qh;
pipe->qh.link = bulk_qh->link;
barrier();
bulk_qh->link = (u32)&pipe->qh | UHCI_PTR_QH;
return &pipe->pipe;
}
static int
wait_td(struct uhci_td *td)
{
u64 end = calc_future_tsc(5000); // XXX - lookup real time.
u32 status;
for (;;) {
status = td->status;
if (!(status & TD_CTRL_ACTIVE))
break;
if (check_time(end)) {
warn_timeout();
return -1;
}
yield();
}
if (status & TD_CTRL_ANY_ERROR) {
dprintf(1, "wait_td error - status=%x\n", status);
return -2;
}
return 0;
}
#define STACKTDS 4
#define TDALIGN 16
int
uhci_send_bulk(struct usb_pipe *p, int dir, void *data, int datasize)
{
if (! CONFIG_USB_UHCI)
return -1;
struct uhci_pipe *pipe = container_of(p, struct uhci_pipe, pipe);
dprintf(7, "uhci_send_bulk qh=%p dir=%d data=%p size=%d\n"
, &pipe->qh, dir, data, datasize);
int maxpacket = GET_FLATPTR(pipe->pipe.maxpacket);
int lowspeed = GET_FLATPTR(pipe->pipe.speed);
int devaddr = (GET_FLATPTR(pipe->pipe.devaddr)
| (GET_FLATPTR(pipe->pipe.ep) << 7));
int toggle = GET_FLATPTR(pipe->toggle) ? TD_TOKEN_TOGGLE : 0;
// Allocate 4 tds on stack (16byte aligned)
u8 tdsbuf[sizeof(struct uhci_td) * STACKTDS + TDALIGN - 1];
struct uhci_td *tds = (void*)ALIGN((u32)tdsbuf, TDALIGN);
memset(tds, 0, sizeof(*tds) * STACKTDS);
// Enable tds
barrier();
SET_FLATPTR(pipe->qh.element, (u32)MAKE_FLATPTR(GET_SEG(SS), tds));
int tdpos = 0;
while (datasize) {
struct uhci_td *td = &tds[tdpos++ % STACKTDS];
int ret = wait_td(td);
if (ret)
goto fail;
int transfer = datasize;
if (transfer > maxpacket)
transfer = maxpacket;
struct uhci_td *nexttd_fl = MAKE_FLATPTR(GET_SEG(SS)
, &tds[tdpos % STACKTDS]);
td->link = (transfer==datasize ? UHCI_PTR_TERM : (u32)nexttd_fl);
td->token = (uhci_explen(transfer) | toggle
| (devaddr << TD_TOKEN_DEVADDR_SHIFT)
| (dir ? USB_PID_IN : USB_PID_OUT));
td->buffer = data;
barrier();
td->status = (uhci_maxerr(3) | (lowspeed ? TD_CTRL_LS : 0)
| TD_CTRL_ACTIVE);
toggle ^= TD_TOKEN_TOGGLE;
data += transfer;
datasize -= transfer;
}
int i;
for (i=0; i<STACKTDS; i++) {
struct uhci_td *td = &tds[tdpos++ % STACKTDS];
int ret = wait_td(td);
if (ret)
goto fail;
}
SET_FLATPTR(pipe->toggle, !!toggle);
return 0;
fail:
dprintf(1, "uhci_send_bulk failed\n");
SET_FLATPTR(pipe->qh.element, UHCI_PTR_TERM);
uhci_waittick(GET_FLATPTR(pipe->iobase));
return -1;
}
struct usb_pipe *
uhci_alloc_intr_pipe(struct usb_pipe *dummy, int frameexp)
{
if (! CONFIG_USB_UHCI)
return NULL;
struct usb_uhci_s *cntl = container_of(
dummy->cntl, struct usb_uhci_s, usb);
dprintf(7, "uhci_alloc_intr_pipe %p %d\n", &cntl->usb, frameexp);
if (frameexp > 10)
frameexp = 10;
int maxpacket = dummy->maxpacket;
int lowspeed = dummy->speed;
int devaddr = dummy->devaddr | (dummy->ep << 7);
// Determine number of entries needed for 2 timer ticks.
int ms = 1<<frameexp;
int count = DIV_ROUND_UP(PIT_TICK_INTERVAL * 1000 * 2, PIT_TICK_RATE * ms);
count = ALIGN(count, 2);
struct uhci_pipe *pipe = malloc_low(sizeof(*pipe));
struct uhci_td *tds = malloc_low(sizeof(*tds) * count);
void *data = malloc_low(maxpacket * count);
if (!pipe || !tds || !data) {
warn_noalloc();
goto fail;
}
memset(pipe, 0, sizeof(*pipe));
memcpy(&pipe->pipe, dummy, sizeof(pipe->pipe));
pipe->qh.element = (u32)tds;
pipe->next_td = &tds[0];
pipe->iobase = cntl->iobase;
int toggle = 0;
int i;
for (i=0; i<count; i++) {
tds[i].link = (i==count-1 ? (u32)&tds[0] : (u32)&tds[i+1]);
tds[i].status = (uhci_maxerr(3) | (lowspeed ? TD_CTRL_LS : 0)
| TD_CTRL_ACTIVE);
tds[i].token = (uhci_explen(maxpacket) | toggle
| (devaddr << TD_TOKEN_DEVADDR_SHIFT)
| USB_PID_IN);
tds[i].buffer = data + maxpacket * i;
toggle ^= TD_TOKEN_TOGGLE;
}
// Add to interrupt schedule.
struct uhci_framelist *fl = cntl->framelist;
if (frameexp == 0) {
// Add to existing interrupt entry.
struct uhci_qh *intr_qh = (void*)(fl->links[0] & ~UHCI_PTR_BITS);
pipe->qh.link = intr_qh->link;
barrier();
intr_qh->link = (u32)&pipe->qh | UHCI_PTR_QH;
if (cntl->control_qh == intr_qh)
cntl->control_qh = &pipe->qh;
if (cntl->bulk_qh == intr_qh)
cntl->bulk_qh = &pipe->qh;
} else {
int startpos = 1<<(frameexp-1);
pipe->qh.link = fl->links[startpos];
barrier();
for (i=startpos; i<ARRAY_SIZE(fl->links); i+=ms)
fl->links[i] = (u32)&pipe->qh | UHCI_PTR_QH;
}
return &pipe->pipe;
fail:
free(pipe);
free(tds);
free(data);
return NULL;
}
int
uhci_poll_intr(struct usb_pipe *p, void *data)
{
ASSERT16();
if (! CONFIG_USB_UHCI)
return -1;
struct uhci_pipe *pipe = container_of(p, struct uhci_pipe, pipe);
struct uhci_td *td = GET_FLATPTR(pipe->next_td);
u32 status = GET_FLATPTR(td->status);
u32 token = GET_FLATPTR(td->token);
if (status & TD_CTRL_ACTIVE)
// No intrs found.
return -1;
// XXX - check for errors.
// Copy data.
void *tddata = GET_FLATPTR(td->buffer);
memcpy_far(GET_SEG(SS), data
, FLATPTR_TO_SEG(tddata), (void*)FLATPTR_TO_OFFSET(tddata)
, uhci_expected_length(token));
// Reenable this td.
struct uhci_td *next = (void*)(GET_FLATPTR(td->link) & ~UHCI_PTR_BITS);
SET_FLATPTR(pipe->next_td, next);
barrier();
SET_FLATPTR(td->status, (uhci_maxerr(0) | (status & TD_CTRL_LS)
| TD_CTRL_ACTIVE));
return 0;
}