ref: f35d5ee5b036b7b4fa59b1839f52fca15b7f99f9
dir: /sys/src/9/pc/usbehcipc.c/
/*
* PC-specific code for
* USB Enhanced Host Controller Interface (EHCI) driver
* High speed USB 2.0.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/usb.h"
#include "usbehci.h"
static Ctlr* ctlrs[Nhcis];
static int maxehci = Nhcis;
static int
ehciecap(Ctlr *ctlr, int cap)
{
int i, off;
off = (ctlr->capio->capparms >> Ceecpshift) & Ceecpmask;
for(i=0; i<48; i++){
if(off < 0x40 || (off & 3) != 0)
break;
if(pcicfgr8(ctlr->pcidev, off) == cap)
return off;
off = pcicfgr8(ctlr->pcidev, off+1);
}
return -1;
}
static void
getehci(Ctlr* ctlr)
{
int i, off;
off = ehciecap(ctlr, Clegacy);
if(off == -1)
return;
if(getconf("*noehcihandoff") == nil && pcicfgr8(ctlr->pcidev, off+CLbiossem) != 0){
dprint("ehci %#p: bios active, taking over...\n", ctlr->capio);
pcicfgw8(ctlr->pcidev, off+CLossem, 1);
for(i = 0; i < 100; i++){
if(pcicfgr8(ctlr->pcidev, off+CLbiossem) == 0)
break;
delay(10);
}
if(i == 100)
print("ehci %#p: bios timed out\n", ctlr->capio);
}
pcicfgw32(ctlr->pcidev, off+CLcontrol, 0); /* no SMIs */
}
static void
ehcireset(Ctlr *ctlr)
{
Eopio *opio;
int i;
ilock(ctlr);
dprint("ehci %#p reset\n", ctlr->capio);
opio = ctlr->opio;
/*
* reclaim from bios
*/
getehci(ctlr);
/*
* halt and route ports to companion controllers
* until we are setup
*/
ehcirun(ctlr, 0);
opio->config = 0;
coherence();
/* clear high 32 bits of address signals if it's 64 bits capable.
* This is probably not needed but it does not hurt and others do it.
*/
if((ctlr->capio->capparms & C64) != 0){
dprint("ehci: 64 bits\n");
opio->seg = 0;
coherence();
}
if(ehcidebugcapio != ctlr->capio){
opio->cmd |= Chcreset; /* controller reset */
coherence();
for(i = 0; i < 100; i++){
if((opio->cmd & Chcreset) == 0)
break;
delay(1);
}
if(i == 100)
print("ehci %#p controller reset timed out\n", ctlr->capio);
}
opio->cmd |= Citc1; /* 1 intr. per µframe */
coherence();
switch(opio->cmd & Cflsmask){
case Cfls1024:
ctlr->nframes = 1024;
break;
case Cfls512:
ctlr->nframes = 512;
break;
case Cfls256:
ctlr->nframes = 256;
break;
default:
panic("ehci: unknown fls %ld", opio->cmd & Cflsmask);
}
dprint("ehci: %d frames\n", ctlr->nframes);
iunlock(ctlr);
}
static void
setdebug(Hci*, int d)
{
ehcidebug = d;
}
static void
shutdown(Hci *hp)
{
int i;
Ctlr *ctlr;
Eopio *opio;
ctlr = hp->aux;
ilock(ctlr);
opio = ctlr->opio;
opio->cmd |= Chcreset; /* controller reset */
coherence();
for(i = 0; i < 100; i++){
if((opio->cmd & Chcreset) == 0)
break;
delay(1);
}
if(i >= 100)
print("ehci %#p controller reset timed out\n", ctlr->capio);
delay(100);
ehcirun(ctlr, 0);
opio->frbase = 0;
iunlock(ctlr);
}
static void
scanpci(void)
{
static int already = 0;
int i;
uintptr io;
Ctlr *ctlr;
Pcidev *p;
Ecapio *capio;
if(already)
return;
already = 1;
p = nil;
while ((p = pcimatch(p, 0, 0)) != nil) {
/*
* Find EHCI controllers (Programming Interface = 0x20).
*/
if(p->ccrb != Pcibcserial || p->ccru != Pciscusb)
continue;
switch(p->ccrp){
case 0x20:
io = p->mem[0].bar & ~0x0f;
break;
default:
continue;
}
if(io == 0)
continue;
print("usbehci: %#x %#x: port %#p size %#x irq %d\n",
p->vid, p->did, io, p->mem[0].size, p->intl);
ctlr = malloc(sizeof(Ctlr));
if(ctlr == nil){
print("usbehci: no memory\n");
continue;
}
if((capio = vmap(io, p->mem[0].size)) == nil){
print("usbehci: cannot map mmio\n");
free(ctlr);
continue;
}
ctlr->pcidev = p;
ctlr->base = io;
ctlr->capio = capio;
for(i = 0; i < Nhcis; i++)
if(ctlrs[i] == nil){
ctlrs[i] = ctlr;
break;
}
if(i >= Nhcis)
print("ehci: bug: more than %d controllers\n", Nhcis);
/*
* currently, if we enable a second ehci controller,
* we'll wedge solid after iunlock in init for the second one.
*/
if (i >= maxehci) {
iprint("usbehci: ignoring controllers after first %d, "
"at %#p\n", maxehci, io);
ctlrs[i] = nil;
}
}
}
static int
reset(Hci *hp)
{
int i;
char *s;
Ctlr *ctlr;
Ecapio *capio;
Pcidev *p;
static Lock resetlck;
s = getconf("*maxehci");
if (s != nil && s[0] >= '0' && s[0] <= '9')
maxehci = atoi(s);
if(maxehci == 0 || getconf("*nousbehci"))
return -1;
ilock(&resetlck);
scanpci();
/*
* Any adapter matches if no hp->port is supplied,
* otherwise the ports must match.
*/
ctlr = nil;
for(i = 0; i < Nhcis && ctlrs[i] != nil; i++){
ctlr = ctlrs[i];
if(ctlr->active == 0)
if(hp->port == 0 || hp->port == ctlr->base){
ctlr->active = 1;
break;
}
}
iunlock(&resetlck);
if(i >= Nhcis || ctlrs[i] == nil)
return -1;
p = ctlr->pcidev;
pcienable(p);
hp->aux = ctlr;
hp->port = ctlr->base;
hp->irq = p->intl;
hp->tbdf = p->tbdf;
capio = ctlr->capio;
hp->nports = capio->parms & Cnports;
ddprint("echi: %s, ncc %lud npcc %lud\n",
capio->parms & 0x10000 ? "leds" : "no leds",
(capio->parms >> 12) & 0xf, (capio->parms >> 8) & 0xf);
ddprint("ehci: routing %s, %sport power ctl, %d ports\n",
capio->parms & 0x40 ? "explicit" : "automatic",
capio->parms & 0x10 ? "" : "no ", hp->nports);
ctlr->opio = (Eopio*)((uintptr)capio + (capio->cap & 0xff));
ehcireset(ctlr);
ehcimeminit(ctlr);
pcisetbme(p);
/*
* Linkage to the generic HCI driver.
*/
ehcilinkage(hp);
hp->shutdown = shutdown;
hp->debug = setdebug;
intrenable(hp->irq, hp->interrupt, hp, hp->tbdf, hp->type);
return 0;
}
void
usbehcilink(void)
{
addhcitype("ehci", reset);
}