/*
* USB Open Host Controller Interface (Ohci) driver
*
* BUGS:
* - Missing isochronous input streams.
* - Too many delays and ilocks.
* - bandwidth admission control must be done per-frame.
* - Buffering could be handled like in uhci, to avoid
* needed block allocation and avoid allocs for small Tds.
* - must warn of power overruns.
*/
#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"
typedef struct Ctlio Ctlio;
typedef struct Ctlr Ctlr;
typedef struct Ed Ed;
typedef struct Edpool Edpool;
typedef struct Epx Epx;
typedef struct Hcca Hcca;
typedef struct Isoio Isoio;
typedef struct Ohci Ohci;
typedef struct Qio Qio;
typedef struct Qtree Qtree;
typedef struct Td Td;
typedef struct Tdpool Tdpool;
enum
{
Incr = 64, /* for Td and Ed pools */
Align = 0x20, /* OHCI only requires 0x10 */
/* use always a power of 2 */
Abortdelay = 1, /* delay after cancelling Tds (ms) */
Tdatomic = 8, /* max nb. of Tds per bulk I/O op. */
Enabledelay = 100, /* waiting for a port to enable */
/* Queue states (software) */
Qidle = 0,
Qinstall,
Qrun,
Qdone,
Qclose,
Qfree,
/* Ed control bits */
Edmpsmask = 0x7ff, /* max packet size */
Edmpsshift = 16,
Edlow = 1 << 13, /* low speed */
Edskip = 1 << 14, /* skip this ed */
Ediso = 1 << 15, /* iso Tds used */
Edtddir = 0, /* get dir from td */
Edin = 2 << 11, /* direction in */
Edout = 1 << 11, /* direction out */
Eddirmask = 3 << 11, /* direction bits */
Edhalt = 1, /* halted (in head ptr) */
Edtoggle = 2, /* toggle (in head ptr) 1 == data1 */
/* Td control bits */
Tdround = 1<<18, /* (rounding) short packets ok */
Tdtoksetup = 0<<19, /* setup packet */
Tdtokin = 2<<19, /* in packet */
Tdtokout = 1<<19, /* out packet */
Tdtokmask = 3<<19, /* in/out/setup bits */
Tdnoioc = 7<<21, /* intr. cnt. value for no interrupt */
Tdusetog = 1<<25, /* use toggle from Td (1) or Ed (0) */
Tddata1 = 1<<24, /* data toggle (1 == data1) */
Tddata0 = 0<<24,
Tdfcmask = 7, /* frame count (iso) */
Tdfcshift = 24,
Tdsfmask = 0xFFFF, /* starting frame (iso) */
Tderrmask = 3, /* error counter */
Tderrshift = 26,
Tdccmask = 0xf, /* condition code (status) */
Tdccshift = 28,
Tdiccmask = 0xf, /* condition code (iso, offsets) */
Tdiccshift = 12,
Ntdframes = 0x10000, /* # of different iso frame numbers */
/* Td errors (condition code) */
Tdok = 0,
Tdcrc = 1,
Tdbitstuff = 2,
Tdbadtog = 3,
Tdstalled = 4,
Tdtmout = 5,
Tdpidchk = 6,
Tdbadpid = 7,
Tddataovr = 8,
Tddataund = 9,
Tdbufovr = 0xC,
Tdbufund = 0xD,
Tdnotacc = 0xE,
/* control register */
Cple = 0x04, /* periodic list enable */
Cie = 0x08, /* iso. list enable */
Ccle = 0x10, /* ctl list enable */
Cble = 0x20, /* bulk list enable */
Cfsmask = 3 << 6, /* functional state... */
Cfsreset = 0 << 6,
Cfsresume = 1 << 6,
Cfsoper = 2 << 6,
Cfssuspend = 3 << 6,
/* command status */
Sblf = 1 << 2, /* bulk list (load) flag */
Sclf = 1 << 1, /* control list (load) flag */
Shcr = 1 << 0, /* host controller reset */
/* intr enable */
Mie = 1 << 31,
Oc = 1 << 30,
Rhsc = 1 << 6,
Fno = 1 << 5,
Ue = 1 << 4,
Rd = 1 << 3,
Sf = 1 << 2,
Wdh = 1 << 1,
So = 1 << 0,
Fmaxpktmask = 0x7fff,
Fmaxpktshift = 16,
HcRhDescA_POTPGT_MASK = 0xff << 24,
HcRhDescA_POTPGT_SHIFT = 24,
/* Rh status */
Lps = 1 << 0,
Cgp = 1 << 0,
Oci = 1 << 1,
Psm = 1 << 8,
Nps = 1 << 9,
Drwe = 1 << 15,
Srwe = 1 << 15,
Lpsc = 1 << 16,
Ccic = 1 << 17,
Crwe = 1 << 31,
/* port status */
Ccs = 0x00001, /* current connect status */
Pes = 0x00002, /* port enable status */
Pss = 0x00004, /* port suspend status */
Poci = 0x00008, /* over current indicator */
Prs = 0x00010, /* port reset status */
Pps = 0x00100, /* port power status */
Lsda = 0x00200, /* low speed device attached */
Csc = 0x10000, /* connect status change */
Pesc = 0x20000, /* enable status change */
Pssc = 0x40000, /* suspend status change */
Ocic = 0x80000, /* over current ind. change */
Prsc = 0x100000, /* reset status change */
/* port status write bits */
Cpe = 0x001, /* clear port enable */
Spe = 0x002, /* set port enable */
Spr = 0x010, /* set port reset */
Spp = 0x100, /* set port power */
Cpp = 0x200, /* clear port power */
};
/*
* Endpoint descriptor. (first 4 words used by hardware)
*/
struct Ed {
ulong ctrl;
ulong tail; /* transfer descriptor */
ulong head;
ulong nexted;
Ed* next; /* sw; in free list or next in list */
Td* tds; /* in use by current xfer; all for iso */
Ep* ep; /* debug/align */
Ed* inext; /* debug/align (dump interrupt eds). */
};
/*
* Endpoint I/O state (software), per direction.
*/
struct Qio
{
QLock; /* for the entire I/O process */
Rendez; /* wait for completion */
Ed* ed; /* to place Tds on it */
int sched; /* queue number (intr/iso) */
int toggle; /* Tddata0/Tddata1 */
ulong usbid; /* device/endpoint address */
int tok; /* Tdsetup, Tdtokin, Tdtokout */
long iotime; /* last I/O time; to hold interrupt polls */
int debug; /* for the endpoint */
char* err; /* error status */
int state; /* Qidle -> Qinstall -> Qrun -> Qdone | Qclose */
long bw; /* load (intr/iso) */
};
struct Ctlio
{
Qio; /* single Ed for all transfers */
uchar* data; /* read from last ctl req. */
int ndata; /* number of bytes read */
};
struct Isoio
{
Qio;
int nframes; /* number of frames for a full second */
Td* atds; /* Tds avail for further I/O */
int navail; /* number of avail Tds */
ulong frno; /* next frame number avail for I/O */
ulong left; /* remainder after rounding Hz to samples/ms */
int nerrs; /* consecutive errors on iso I/O */
};
/*
* Transfer descriptor. Size must be multiple of 32
* First block is used by hardware (aligned to 32).
*/
struct Td
{
ulong ctrl;
ulong cbp; /* current buffer pointer */
ulong nexttd;
ulong be;
ushort offsets[8]; /* used by Iso Tds only */
Td* next; /* in free or Ed tds list */
Td* anext; /* in avail td list (iso) */
Ep* ep; /* using this Td for I/O */
Qio* io; /* using this Td for I/O */
Block* bp; /* data for this Td */
ulong nbytes; /* bytes in this Td */
ulong cbp0; /* initial value for cbp */
ulong last; /* true for last Td in Qio */
};
/*
* Host controller communication area (hardware)
*/
struct Hcca
{
ulong intrtable[32];
ushort framenumber;
ushort pad1;
ulong donehead;
uchar reserved[116];
};
/*
* I/O registers
*/
struct Ohci
{
/* control and status group */
ulong revision; /*00*/
ulong control; /*04*/
ulong cmdsts; /*08*/
ulong intrsts; /*0c*/
ulong intrenable; /*10*/
ulong intrdisable; /*14*/
/* memory pointer group */
ulong hcca; /*18*/
ulong periodcurred; /*1c*/
ulong ctlheaded; /*20*/
ulong ctlcurred; /*24*/
ulong bulkheaded; /*28*/
ulong bulkcurred; /*2c*/
ulong donehead; /*30*/
/* frame counter group */
ulong fminterval; /*34*/
ulong fmremaining; /*38*/
ulong fmnumber; /*3c*/
ulong periodicstart; /*40*/
ulong lsthreshold; /*44*/
/* root hub group */
ulong rhdesca; /*48*/
ulong rhdescb; /*4c*/
ulong rhsts; /*50*/
ulong rhportsts[15]; /*54*/
ulong pad25[20]; /*90*/
/* unknown */
ulong hostueaddr; /*e0*/
ulong hostuests; /*e4*/
ulong hosttimeoutctrl; /*e8*/
ulong pad59; /*ec*/
ulong pad60; /*f0*/
ulong hostrevision; /*f4*/
ulong pad62[2];
/*100*/
};
/*
* Endpoint tree (software)
*/
struct Qtree
{
int nel;
int depth;
ulong* bw;
Ed** root;
};
struct Tdpool
{
Lock;
Td* free;
int nalloc;
int ninuse;
int nfree;
};
struct Edpool
{
Lock;
Ed* free;
int nalloc;
int ninuse;
int nfree;
};
struct Ctlr
{
Lock; /* for ilock; lists and basic ctlr I/O */
QLock resetl; /* lock controller during USB reset */
int active;
Ctlr* next;
int nports;
Ohci* ohci; /* base I/O address */
Hcca* hcca; /* intr/done Td lists (used by hardware) */
int overrun; /* sched. overrun */
Ed* intrhd; /* list of intr. eds in tree */
Qtree* tree; /* tree for t Ep i/o */
int ntree; /* number of dummy Eds in tree */
Pcidev* pcidev;
};
#define dqprint if(debug || io && io->debug)print
#define ddqprint if(debug>1 || (io && io->debug>1))print
#define diprint if(debug || iso && iso->debug)print
#define ddiprint if(debug>1 || (iso && iso->debug>1))print
#define TRUNC(x, sz) ((x) & ((sz)-1))
static int ohciinterrupts[Nttypes];
static char* iosname[] = { "idle", "install", "run", "done", "close", "FREE" };
static int debug;
static Edpool edpool;
static Tdpool tdpool;
static Ctlr* ctlrs[Nhcis];
static QLock usbhstate; /* protects name space state */
static int schedendpt(Ctlr *ub, Ep *ep);
static void unschedendpt(Ctlr *ub, Ep *ep);
static long qtd(Ctlr*, Ep*, int, Block*, uchar*, uchar*, int, ulong);
static char* errmsgs[] =
{
[Tdcrc] "crc error",
[Tdbitstuff] "bit stuffing error",
[Tdbadtog] "bad toggle",
[Tdstalled] Estalled,
[Tdtmout] "timeout error",
[Tdpidchk] "pid check error",
[Tdbadpid] "bad pid",
[Tddataovr] "data overrun",
[Tddataund] "data underrun",
[Tdbufovr] "buffer overrun",
[Tdbufund] "buffer underrun",
[Tdnotacc] "not accessed"
};
static void*
pa2ptr(ulong pa)
{
if(pa == 0)
return nil;
else
return KADDR(pa);
}
static ulong
ptr2pa(void *p)
{
if(p == nil)
return 0;
else
return PADDR(p);
}
static void
waitSOF(Ctlr *ub)
{
int frame = ub->hcca->framenumber & 0x3f;
do {
delay(2);
} while(frame == (ub->hcca->framenumber & 0x3f));
}
static char*
errmsg(int err)
{
if(err < nelem(errmsgs))
return errmsgs[err];
return nil;
}
static Ed*
ctlhd(Ctlr *ctlr)
{
return pa2ptr(ctlr->ohci->ctlheaded);
}
static Ed*
bulkhd(Ctlr *ctlr)
{
return pa2ptr(ctlr->ohci->bulkheaded);
}
static void
edlinked(Ed *ed, Ed *next)
{
if(ed == nil)
print("edlinked: nil ed: pc %#p\n", getcallerpc(&ed));
ed->nexted = ptr2pa(next);
ed->next = next;
}
static void
setctlhd(Ctlr *ctlr, Ed *ed)
{
ctlr->ohci->ctlheaded = ptr2pa(ed);
if(ed != nil)
ctlr->ohci->cmdsts |= Sclf; /* reload it on next pass */
}
static void
setbulkhd(Ctlr *ctlr, Ed *ed)
{
ctlr->ohci->bulkheaded = ptr2pa(ed);
if(ed != nil)
ctlr->ohci->cmdsts |= Sblf; /* reload it on next pass */
}
static void
unlinkctl(Ctlr *ctlr, Ed *ed)
{
Ed *this, *prev, *next;
ctlr->ohci->control &= ~Ccle;
waitSOF(ctlr);
this = ctlhd(ctlr);
ctlr->ohci->ctlcurred = 0;
prev = nil;
while(this != nil && this != ed){
prev = this;
this = this->next;
}
if(this == nil){
print("unlinkctl: not found\n");
return;
}
next = this->next;
if(prev == nil)
setctlhd(ctlr, next);
else
edlinked(prev, next);
ctlr->ohci->control |= Ccle;
edlinked(ed, nil); /* wipe out next field */
}
static void
unlinkbulk(Ctlr *ctlr, Ed *ed)
{
Ed *this, *prev, *next;
ctlr->ohci->control &= ~Cble;
waitSOF(ctlr);
this = bulkhd(ctlr);
ctlr->ohci->bulkcurred = 0;
prev = nil;
while(this != nil && this != ed){
prev = this;
this = this->next;
}
if(this == nil){
print("unlinkbulk: not found\n");
return;
}
next = this->next;
if(prev == nil)
setbulkhd(ctlr, next);
else
edlinked(prev, next);
ctlr->ohci->control |= Cble;
edlinked(ed, nil); /* wipe out next field */
}
static void
edsetaddr(Ed *ed, ulong addr)
{
ulong ctrl;
ctrl = ed->ctrl & ~((Epmax<<7)|Devmax);
ctrl |= (addr & ((Epmax<<7)|Devmax));
ed->ctrl = ctrl;
}
static void
edsettog(Ed *ed, int c)
{
if(c != 0)
ed->head |= Edtoggle;
else
ed->head &= ~Edtoggle;
}
static int
edtoggle(Ed *ed)
{
return ed->head & Edtoggle;
}
static int
edhalted(Ed *ed)
{
return ed->head & Edhalt;
}
static int
edmaxpkt(Ed *ed)
{
return (ed->ctrl >> Edmpsshift) & Edmpsmask;
}
static void
edsetmaxpkt(Ed *ed, int m)
{
ulong c;
c = ed->ctrl & ~(Edmpsmask << Edmpsshift);
ed->ctrl = c | ((m&Edmpsmask) << Edmpsshift);
}
static int
tderrs(Td *td)
{
return (td->ctrl >> Tdccshift) & Tdccmask;
}
static int
tdtok(Td *td)
{
return (td->ctrl & Tdtokmask);
}
static Td*
tdalloc(void)
{
Td *td;
Td *pool;
int i;
lock(&tdpool);
if(tdpool.free == nil){
ddprint("ohci: tdalloc %d Tds\n", Incr);
pool = xspanalloc(Incr*sizeof(Td), Align, 0);
if(pool == nil)
panic("tdalloc");
for(i=Incr; --i>=0;){
pool[i].next = tdpool.free;
tdpool.free = &pool[i];
}
tdpool.nalloc += Incr;
tdpool.nfree += Incr;
}
tdpool.ninuse++;
tdpool.nfree--;
td = tdpool.free;
tdpool.free = td->next;
memset(td, 0, sizeof(Td));
unlock(&tdpool);
assert(((uintptr)td & 0xF) == 0);
return td;
}
static void
tdfree(Td *td)
{
if(td == 0)
return;
freeb(td->bp);
td->bp = nil;
lock(&tdpool);
if(td->nexttd == 0x77777777)
panic("ohci: tdfree: double free");
memset(td, 7, sizeof(Td)); /* poison */
td->next = tdpool.free;
tdpool.free = td;
tdpool.ninuse--;
tdpool.nfree++;
unlock(&tdpool);
}
static Ed*
edalloc(void)
{
Ed *ed, *pool;
int i;
lock(&edpool);
if(edpool.free == nil){
ddprint("ohci: edalloc %d Eds\n", Incr);
pool = xspanalloc(Incr*sizeof(Ed), Align, 0);
if(pool == nil)
panic("edalloc");
for(i=Incr; --i>=0;){
pool[i].next = edpool.free;
edpool.free = &pool[i];
}
edpool.nalloc += Incr;
edpool.nfree += Incr;
}
edpool.ninuse++;
edpool.nfree--;
ed = edpool.free;
edpool.free = ed->next;
memset(ed, 0, sizeof(Ed));
unlock(&edpool);
return ed;
}
static void
edfree(Ed *ed)
{
Td *td, *next;
int i;
if(ed == 0)
return;
i = 0;
for(td = ed->tds; td != nil; td = next){
next = td->next;
tdfree(td);
if(i++ > 2000){
print("ohci: bug: ed with more than 2000 tds\n");
break;
}
}
lock(&edpool);
if(ed->nexted == 0x99999999)
panic("ohci: edfree: double free");
memset(ed, 9, sizeof(Ed)); /* poison */
ed->next = edpool.free;
edpool.free = ed;
edpool.ninuse--;
edpool.nfree++;
unlock(&edpool);
ddprint("edfree: ed %#p\n", ed);
}
/*
* return smallest power of 2 >= n
*/
static int
flog2(int n)
{
int i;
for(i = 0; (1 << i) < n; i++)
;
return i;
}
/*
* return smallest power of 2 <= n
*/
static int
flog2lower(int n)
{
int i;
for(i = 0; (1 << (i + 1)) <= n; i++)
;
return i;
}
static int
pickschedq(Qtree *qt, int pollival, ulong bw, ulong limit)
{
int i, j, d, upperb, q;
ulong best, worst, total;
d = flog2lower(pollival);
if(d > qt->depth)
d = qt->depth;
q = -1;
worst = 0;
best = ~0;
upperb = (1 << (d+1)) - 1;
for(i = (1 << d) - 1; i < upperb; i++){
total = qt->bw[0];
for(j = i; j > 0; j = (j - 1) / 2)
total += qt->bw[j];
if(total < best){
best = total;
q = i;
}
if(total > worst)
worst = total;
}
if(worst + bw >= limit)
return -1;
return q;
}
static int
schedq(Ctlr *ctlr, Qio *io, int pollival)
{
int q;
Ed *ted;
q = pickschedq(ctlr->tree, pollival, io->bw, ~0);
ddqprint("ohci: sched %#p q %d, ival %d, bw %ld\n", io, q, pollival, io->bw);
if(q < 0){
print("ohci: no room for ed\n");
return -1;
}
ctlr->tree->bw[q] += io->bw;
ted = ctlr->tree->root[q];
io->sched = q;
edlinked(io->ed, ted->next);
edlinked(ted, io->ed);
io->ed->inext = ctlr->intrhd;
ctlr->intrhd = io->ed;
return 0;
}
static void
unschedq(Ctlr *ctlr, Qio *qio)
{
int q;
Ed *prev, *this, *next;
Ed **l;
q = qio->sched;
if(q < 0)
return;
ctlr->tree->bw[q] -= qio->bw;
prev = ctlr->tree->root[q];
this = prev->next;
while(this != nil && this != qio->ed){
prev = this;
this = this->next;
}
if(this == nil)
print("ohci: unschedq %d: not found\n", q);
else{
next = this->next;
edlinked(prev, next);
}
waitSOF(ctlr);
for(l = &ctlr->intrhd; *l != nil; l = &(*l)->inext)
if(*l == qio->ed){
*l = (*l)->inext;
return;
}
print("ohci: unschedq: ed %#p not found\n", qio->ed);
}
static char*
seprinttdtok(char *s, char *e, int tok)
{
switch(tok){
case Tdtoksetup:
s = seprint(s, e, " setup");
break;
case Tdtokin:
s = seprint(s, e, " in");
break;
case Tdtokout:
s = seprint(s, e, " out");
break;
}
return s;
}
static char*
seprinttd(char *s, char *e, Td *td, int iso)
{
int i;
Block *bp;
if(td == nil)
return seprint(s, e, "<nil td>\n");
s = seprint(s, e, "%#p ep %#p ctrl %#p", td, td->ep, td->ctrl);
s = seprint(s, e, " cc=%#ulx", (td->ctrl >> Tdccshift) & Tdccmask);
if(iso == 0){
if((td->ctrl & Tdround) != 0)
s = seprint(s, e, " rnd");
s = seprinttdtok(s, e, td->ctrl & Tdtokmask);
if((td->ctrl & Tdusetog) != 0)
s = seprint(s, e, " d%d", (td->ctrl & Tddata1) ? 1 : 0);
else
s = seprint(s, e, " d-");
s = seprint(s, e, " ec=%uld", (td->ctrl >> Tderrshift) & Tderrmask);
}else{
s = seprint(s, e, " fc=%uld", (td->ctrl >> Tdfcshift) & Tdfcmask);
s = seprint(s, e, " sf=%uld", td->ctrl & Tdsfmask);
}
s = seprint(s, e, " cbp0 %#p cbp %#p next %#p be %#p %s",
td->cbp0, td->cbp, td->nexttd, td->be, td->last ? "last" : "");
s = seprint(s, e, "\n\t\t%ld bytes", td->nbytes);
if((bp = td->bp) != nil){
s = seprint(s, e, " rp %#p wp %#p ", bp->rp, bp->wp);
if(BLEN(bp) > 0)
s = seprintdata(s, e, bp->rp, bp->wp - bp->rp);
}
if(iso == 0)
return seprint(s, e, "\n");
s = seprint(s, e, "\n\t\t");
/* we use only offsets[0] */
i = 0;
s = seprint(s, e, "[%d] %#ux cc=%#ux sz=%ud\n", i, td->offsets[i],
(td->offsets[i] >> Tdiccshift) & Tdiccmask,
td->offsets[i] & 0x7FF);
return s;
}
static void
dumptd(Td *td, char *p, int iso)
{
static char buf[512]; /* Too much */
char *s;
s = seprint(buf, buf+sizeof(buf), "%s: ", p);
s = seprinttd(s, buf+sizeof(buf), td, iso);
if(s > buf && s[-1] != '\n')
s[-1] = '\n';
print("\t%s", buf);
}
static void
dumptds(Td *td, char *p, int iso)
{
int i;
for(i = 0; td != nil; td = td->next){
dumptd(td, p, iso);
if(td->last)
break;
if(tdtok(td) == Tdtokin && ++i > 2){
print("\t\t...\n");
break;
}
}
}
static void
dumped(Ed *ed)
{
char *buf, *s, *e;
if(ed == nil){
print("<null ed>\n");
return;
}
buf = malloc(512);
/* no waserror; may want to use from interrupt context */
if(buf == nil)
return;
e = buf+512;
s = seprint(buf, e, "\ted %#p: ctrl %#p", ed, ed->ctrl);
if((ed->ctrl & Edskip) != 0)
s = seprint(s, e, " skip");
if((ed->ctrl & Ediso) != 0)
s = seprint(s, e, " iso");
if((ed->ctrl & Edlow) != 0)
s = seprint(s, e, " low");
s = seprint(s, e, " d%d", (ed->head & Edtoggle) ? 1 : 0);
if((ed->ctrl & Eddirmask) == Edin)
s = seprint(s, e, " in");
if((ed->ctrl & Eddirmask) == Edout)
s = seprint(s, e, " out");
if(edhalted(ed))
s = seprint(s, e, " hlt");
s = seprint(s, e, " ep%uld.%uld", (ed->ctrl>>7)&Epmax, ed->ctrl&0x7f);
s = seprint(s, e, " maxpkt %uld", (ed->ctrl>>Edmpsshift)&Edmpsmask);
seprint(s, e, " tail %#p head %#p next %#p\n",ed->tail,ed->head,ed->nexted);
print("%s", buf);
free(buf);
if(ed->tds != nil && (ed->ctrl & Ediso) == 0)
dumptds(ed->tds, "td", 0);
}
static char*
seprintio(char *s, char *e, Qio *io, char *pref)
{
s = seprint(s, e, "%s qio %#p ed %#p", pref, io, io->ed);
s = seprint(s, e, " tog %d iot %ld err %s id %#ulx",
io->toggle, io->iotime, io->err, io->usbid);
s = seprinttdtok(s, e, io->tok);
s = seprint(s, e, " %s\n", iosname[io->state]);
return s;
}
static char*
seprintep(char* s, char* e, Ep *ep)
{
Isoio *iso;
Qio *io;
Ctlio *cio;
if(ep == nil)
return seprint(s, e, "<nil ep>\n");
if(ep->aux == nil)
return seprint(s, e, "no mdep\n");
switch(ep->ttype){
case Tctl:
cio = ep->aux;
s = seprintio(s, e, cio, "c");
s = seprint(s, e, "\trepl %d ndata %d\n", ep->rhrepl, cio->ndata);
break;
case Tbulk:
case Tintr:
io = ep->aux;
if(ep->mode != OWRITE)
s = seprintio(s, e, &io[OREAD], "r");
if(ep->mode != OREAD)
s = seprintio(s, e, &io[OWRITE], "w");
break;
case Tiso:
iso = ep->aux;
s = seprintio(s, e, iso, "w");
s = seprint(s, e, "\tntds %d avail %d frno %uld left %uld next avail %#p\n",
iso->nframes, iso->navail, iso->frno, iso->left, iso->atds);
break;
}
return s;
}
static char*
seprintctl(char *s, char *se, ulong ctl)
{
s = seprint(s, se, "en=");
if((ctl&Cple) != 0)
s = seprint(s, se, "p");
if((ctl&Cie) != 0)
s = seprint(s, se, "i");
if((ctl&Ccle) != 0)
s = seprint(s, se, "c");
if((ctl&Cble) != 0)
s = seprint(s, se, "b");
switch(ctl & Cfsmask){
case Cfsreset:
return seprint(s, se, " reset");
case Cfsresume:
return seprint(s, se, " resume");
case Cfsoper:
return seprint(s, se, " run");
case Cfssuspend:
return seprint(s, se, " suspend");
default:
return seprint(s, se, " ???");
}
}
static void
dump(Hci *hp)
{
Ctlr *ctlr;
Ed *ed;
char cs[20];
ctlr = hp->aux;
ilock(ctlr);
seprintctl(cs, cs+sizeof(cs), ctlr->ohci->control);
print("ohci ctlr %#p: frno %#ux ctl %#lux %s sts %#lux intr %#lux\n",
ctlr, ctlr->hcca->framenumber, ctlr->ohci->control, cs,
ctlr->ohci->cmdsts, ctlr->ohci->intrsts);
print("ctlhd %#ulx cur %#ulx bulkhd %#ulx cur %#ulx done %#ulx\n",
ctlr->ohci->ctlheaded, ctlr->ohci->ctlcurred,
ctlr->ohci->bulkheaded, ctlr->ohci->bulkcurred,
ctlr->ohci->donehead);
if(ctlhd(ctlr) != nil)
print("[ctl]\n");
for(ed = ctlhd(ctlr); ed != nil; ed = ed->next)
dumped(ed);
if(bulkhd(ctlr) != nil)
print("[bulk]\n");
for(ed = bulkhd(ctlr); ed != nil; ed = ed->next)
dumped(ed);
if(ctlr->intrhd != nil)
print("[intr]\n");
for(ed = ctlr->intrhd; ed != nil; ed = ed->inext)
dumped(ed);
if(ctlr->tree->root[0]->next != nil)
print("[iso]");
for(ed = ctlr->tree->root[0]->next; ed != nil; ed = ed->next)
dumped(ed);
print("%d eds in tree\n", ctlr->ntree);
iunlock(ctlr);
lock(&tdpool);
print("%d tds allocated = %d in use + %d free\n",
tdpool.nalloc, tdpool.ninuse, tdpool.nfree);
unlock(&tdpool);
lock(&edpool);
print("%d eds allocated = %d in use + %d free\n",
edpool.nalloc, edpool.ninuse, edpool.nfree);
unlock(&edpool);
}
/*
* Compute size for the next iso Td and setup its
* descriptor for I/O according to the buffer size.
*/
static void
isodtdinit(Ep *ep, Isoio *iso, Td *td)
{
Block *bp;
long size;
int i;
bp = td->bp;
assert(bp != nil && BLEN(bp) == 0);
size = (ep->hz+iso->left) * ep->pollival / 1000;
iso->left = (ep->hz+iso->left) * ep->pollival % 1000;
size *= ep->samplesz;
if(size > ep->maxpkt){
print("ohci: ep%d.%d: size > maxpkt\n",
ep->dev->nb, ep->nb);
print("size = %uld max = %ld\n", size, ep->maxpkt);
size = ep->maxpkt;
}
td->nbytes = size;
memset(bp->wp, 0, size); /* in case we don't fill it on time */
td->cbp0 = td->cbp = ptr2pa(bp->rp) & ~0xFFF;
td->ctrl = TRUNC(iso->frno, Ntdframes);
td->offsets[0] = (ptr2pa(bp->rp) & 0xFFF);
td->offsets[0] |= (Tdnotacc << Tdiccshift);
/* in case the controller checks out the offests... */
for(i = 1; i < nelem(td->offsets); i++)
td->offsets[i] = td->offsets[0];
td->be = ptr2pa(bp->rp + size - 1);
td->ctrl |= (0 << Tdfcshift); /* frame count is 1 */
iso->frno = TRUNC(iso->frno + ep->pollival, Ntdframes);
}
/*
* start I/O on the dummy td and setup a new dummy to fill up.
*/
static void
isoadvance(Ep *ep, Isoio *iso, Td *td)
{
Td *dtd;
dtd = iso->atds;
iso->atds = dtd->anext;
iso->navail--;
dtd->anext = nil;
dtd->bp->wp = dtd->bp->rp;
dtd->nexttd = 0;
td->nexttd = ptr2pa(dtd);
isodtdinit(ep, iso, dtd);
iso->ed->tail = ptr2pa(dtd);
}
static int
isocanwrite(void *a)
{
Isoio *iso;
iso = a;
return iso->state == Qclose || iso->err != nil ||
iso->navail > iso->nframes / 2;
}
/*
* Service a completed/failed Td from the done queue.
* It may be of any transfer type.
* The queue is not in completion order.
* (It's actually in reverse completion order).
*
* When an error, a short packet, or a last Td is found
* we awake the process waiting for the transfer.
* Although later we will process other Tds completed
* before, epio won't be able to touch the current Td
* until interrupt returns and releases the lock on the
* controller.
*/
static void
qhinterrupt(Ctlr *, Ep *ep, Qio *io, Td *td, int)
{
Block *bp;
int mode, err;
Ed *ed;
ed = io->ed;
if(io->state != Qrun)
return;
if(tdtok(td) == Tdtokin)
mode = OREAD;
else
mode = OWRITE;
bp = td->bp;
err = tderrs(td);
switch(err){
case Tddataovr: /* Overrun is not an error */
break;
case Tdok:
/* virtualbox doesn't always report underflow on short packets */
if(td->cbp == 0)
break;
/* fall through */
case Tddataund:
/* short input packets are ok */
if(mode == OREAD){
if(td->cbp == 0)
panic("ohci: short packet but cbp == 0");
/*
* td->cbp and td->cbp0 are the real addresses
* corresponding to virtual addresses bp->wp and
* bp->rp respectively.
*/
bp->wp = bp->rp + (td->cbp - td->cbp0);
if(bp->wp < bp->rp)
panic("ohci: wp < rp");
/*
* It's ok. clear error and flag as last in xfer.
* epio must ignore following Tds.
*/
td->last = 1;
td->ctrl &= ~(Tdccmask << Tdccshift);
break;
}
/* else fall; it's an error */
case Tdcrc:
case Tdbitstuff:
case Tdbadtog:
case Tdstalled:
case Tdtmout:
case Tdpidchk:
case Tdbadpid:
bp->wp = bp->rp; /* no bytes in xfer. */
io->err = errmsg(err);
if(debug || ep->debug){
print("tdinterrupt: failed err %d (%s)\n", err, io->err);
dumptd(td, "failed", ed->ctrl & Ediso);
}
td->last = 1;
break;
default:
panic("ohci: td cc %ud unknown", err);
}
if(td->last != 0){
/*
* clear td list and halt flag.
*/
ed->head = (ed->head & Edtoggle) | ed->tail;
ed->tds = pa2ptr(ed->tail);
io->state = Qdone;
wakeup(io);
}
}
/*
* BUG: Iso input streams are not implemented.
*/
static void
isointerrupt(Ctlr *ctlr, Ep *ep, Qio *io, Td *td, int)
{
Isoio *iso;
Block *bp;
Ed *ed;
int err, isoerr;
iso = ep->aux;
ed = io->ed;
if(io->state == Qclose)
return;
bp = td->bp;
/*
* When we get more than half the frames consecutive errors
* we signal an actual error. Errors in the entire Td are
* more serious and are always singaled.
* Errors like overrun are not really errors. In fact, for
* output, errors cannot be really detected. The driver will
* hopefully notice I/O errors on input endpoints and detach the device.
*/
err = tderrs(td);
isoerr = (td->offsets[0] >> Tdiccshift) & Tdiccmask;
if(isoerr == Tdok || isoerr == Tdnotacc)
iso->nerrs = 0;
else if(iso->nerrs++ > iso->nframes/2)
err = Tdstalled;
if(err != Tdok && err != Tddataovr){
bp->wp = bp->rp;
io->err = errmsg(err);
if(debug || ep->debug){
print("ohci: isointerrupt: ep%d.%d: err %d (%s) frnum 0x%lux\n",
ep->dev->nb, ep->nb,
err, errmsg(err), ctlr->ohci->fmnumber);
dumptd(td, "failed", ed->ctrl & Ediso);
}
}
td->bp->wp = td->bp->rp;
td->nbytes = 0;
td->anext = iso->atds;
iso->atds = td;
iso->navail++;
/*
* If almost all Tds are avail the user is not doing I/O at the
* required rate. We put another Td in place to keep the polling rate.
*/
if(iso->err == nil && iso->navail > iso->nframes - 10)
isoadvance(ep, iso, pa2ptr(iso->ed->tail));
/*
* If there's enough buffering futher I/O can be done.
*/
if(isocanwrite(iso))
wakeup(iso);
}
static void
interrupt(Ureg *, void *arg)
{
Td *td, *ntd;
Hci *hp;
Ctlr *ctlr;
ulong status, curred;
int i, frno;
hp = arg;
ctlr = hp->aux;
ilock(ctlr);
ctlr->ohci->intrdisable = Mie;
coherence();
status = ctlr->ohci->intrsts & ctlr->ohci->intrenable;
status &= Oc|Rhsc|Fno|Ue|Rd|Sf|Wdh|So;
frno = TRUNC(ctlr->ohci->fmnumber, Ntdframes);
if(status & Wdh){
/* lsb of donehead has bit to flag other intrs. */
td = pa2ptr(ctlr->hcca->donehead & ~0xF);
for(i = 0; td != nil && i < 1024; i++){
if(0)ddprint("ohci tdinterrupt: td %#p\n", td);
ntd = pa2ptr(td->nexttd & ~0xF);
td->nexttd = 0;
if(td->ep == nil || td->io == nil)
panic("ohci: interrupt: ep %#p io %#p",
td->ep, td->io);
ohciinterrupts[td->ep->ttype]++;
if(td->ep->ttype == Tiso)
isointerrupt(ctlr, td->ep, td->io, td, frno);
else
qhinterrupt(ctlr, td->ep, td->io, td, frno);
td = ntd;
}
if(i >= 1024)
print("ohci: bug: more than 1024 done Tds?\n");
ctlr->hcca->donehead = 0;
}
ctlr->ohci->intrsts = status;
status &= ~Wdh;
status &= ~Sf;
if(status & So){
print("ohci: sched overrun: too much load\n");
ctlr->overrun++;
status &= ~So;
}
if((status & Ue) != 0){
curred = ctlr->ohci->periodcurred;
print("ohci: unrecoverable error frame 0x%.8lux ed 0x%.8lux, "
"ints %d %d %d %d\n",
ctlr->ohci->fmnumber, curred,
ohciinterrupts[Tctl], ohciinterrupts[Tintr],
ohciinterrupts[Tbulk], ohciinterrupts[Tiso]);
if(curred != 0)
dumped(pa2ptr(curred));
status &= ~Ue;
}
if(status != 0)
print("ohci interrupt: unhandled sts 0x%.8lux\n", status);
ctlr->ohci->intrenable = Mie | Wdh | Ue;
iunlock(ctlr);
}
/*
* The old dummy Td is used to implement the new Td.
* A new dummy is linked at the end of the old one and
* returned, to link further Tds if needed.
*/
static Td*
epgettd(Ep *ep, Qio *io, Td **dtdp, int flags, void *a, int count)
{
Td *td, *dtd;
Block *bp;
if(count <= BY2PG)
bp = allocb(count);
else{
if(count > 2*BY2PG)
panic("ohci: transfer > two pages");
/* maximum of one physical page crossing allowed */
bp = allocb(count+BY2PG);
bp->rp = (uchar*)PGROUND((uintptr)bp->rp);
bp->wp = bp->rp;
}
dtd = *dtdp;
td = dtd;
td->bp = bp;
if(count > 0){
td->cbp0 = td->cbp = ptr2pa(bp->wp);
td->be = ptr2pa(bp->wp + count - 1);
if(a != nil){
/* validaddr((uintptr)a, count, 0); DEBUG */
memmove(bp->wp, a, count);
}
bp->wp += count;
}
td->nbytes = count;
td->ctrl = io->tok|Tdusetog|io->toggle|flags;
if(io->toggle == Tddata0)
io->toggle = Tddata1;
else
io->toggle = Tddata0;
assert(td->ep == ep);
td->io = io;
dtd = tdalloc(); /* new dummy */
dtd->ep = ep;
td->nexttd = ptr2pa(dtd);
td->next = dtd;
*dtdp = dtd;
return td;
}
/*
* Try to get them idle
*/
static void
aborttds(Qio *io)
{
Ed *ed;
Td *td;
ed = io->ed;
if(ed == nil)
return;
ed->ctrl |= Edskip;
for(td = ed->tds; td != nil; td = td->next)
if(td->bp != nil)
td->bp->wp = td->bp->rp;
ed->head = (ed->head&0xF) | ed->tail;
if((ed->ctrl & Ediso) == 0)
ed->tds = pa2ptr(ed->tail);
}
static int
epiodone(void *a)
{
Qio *io;
io = a;
return io->state != Qrun;
}
static void
epiowait(Ctlr *ctlr, Qio *io, int tmout, ulong)
{
Ed *ed;
int timedout;
ed = io->ed;
if(0)ddqprint("ohci io %#p sleep on ed %#p state %s\n",
io, ed, iosname[io->state]);
timedout = 0;
if(waserror()){
dqprint("ohci io %#p ed %#p timed out\n", io, ed);
timedout++;
}else{
if(tmout == 0)
sleep(io, epiodone, io);
else
tsleep(io, epiodone, io, tmout);
poperror();
}
ilock(ctlr);
if(io->state == Qrun)
timedout = 1;
else if(io->state != Qdone && io->state != Qclose)
panic("epio: ed not done and not closed");
if(timedout){
aborttds(io);
io->err = "request timed out";
iunlock(ctlr);
if(!waserror()){
tsleep(&up->sleep, return0, 0, Abortdelay);
poperror();
}
ilock(ctlr);
}
if(io->state != Qclose)
io->state = Qidle;
iunlock(ctlr);
}
/*
* Non iso I/O.
* To make it work for control transfers, the caller may
* lock the Qio for the entire control transfer.
*/
static long
epio(Ep *ep, Qio *io, void *a, long count, int mustlock)
{
Ed *ed;
Ctlr *ctlr;
char buf[80];
char *err;
uchar *c;
Td *td, *ltd, *ntd, *td0;
int last, ntds, tmout;
long tot, n;
ulong load;
ed = io->ed;
ctlr = ep->hp->aux;
io->debug = ep->debug;
tmout = ep->tmout;
ddeprint("ohci: %s ep%d.%d io %#p count %ld\n",
io->tok == Tdtokin ? "in" : "out",
ep->dev->nb, ep->nb, io, count);
if((debug > 1 || ep->debug > 1) && io->tok != Tdtokin){
seprintdata(buf, buf+sizeof(buf), a, count);
print("\t%s\n", buf);
}
if(mustlock){
qlock(io);
if(waserror()){
qunlock(io);
nexterror();
}
}
io->err = nil;
ilock(ctlr);
if(io->state == Qclose){ /* Tds released by cancelio */
iunlock(ctlr);
error(io->err ? io->err : Eio);
}
if(io->state != Qidle)
panic("epio: qio not idle");
io->state = Qinstall;
c = a;
ltd = td0 = ed->tds;
load = tot = 0;
do{
n = 2*BY2PG;
if(count-tot < n)
n = count-tot;
if(c != nil && io->tok != Tdtokin)
td = epgettd(ep, io, <d, 0, c+tot, n);
else
td = epgettd(ep, io, <d, 0, nil, n);
tot += n;
load += ep->load;
}while(tot < count);
if(td0 == nil || ltd == nil || td0 == ltd)
panic("epio: no td");
td->last = 1;
if(debug > 2 || ep->debug > 2)
dumptds(td0, "put td", ep->ttype == Tiso);
iunlock(ctlr);
ilock(ctlr);
if(io->state != Qclose){
io->iotime = TK2MS(MACHP(0)->ticks);
io->state = Qrun;
ed->tail = ptr2pa(ltd);
if(ep->ttype == Tctl)
ctlr->ohci->cmdsts |= Sclf;
else if(ep->ttype == Tbulk)
ctlr->ohci->cmdsts |= Sblf;
}
iunlock(ctlr);
epiowait(ctlr, io, tmout, load);
ilock(ctlr);
if(debug > 1 || ep->debug > 1)
dumptds(td0, "got td", 0);
iunlock(ctlr);
tot = 0;
c = a;
ntds = last = 0;
for(td = td0; td != ltd; td = ntd){
ntds++;
/*
* If the Td is flagged as last we must
* ignore any following Td. The block may
* seem to have bytes but interrupt has not seen
* those Tds through the done queue, and they are void.
*/
if(last == 0 && tderrs(td) == Tdok){
n = BLEN(td->bp);
tot += n;
if(c != nil && tdtok(td) == Tdtokin && n > 0){
memmove(c, td->bp->rp, n);
c += n;
}
}
last |= td->last;
ntd = td->next;
tdfree(td);
}
if(edtoggle(ed) == 0)
io->toggle = Tddata0;
else
io->toggle = Tddata1;
err = io->err;
if(mustlock){
qunlock(io);
poperror();
}
ddeprint("ohci: io %#p: %d tds: return %ld err '%s'\n\n",
io, ntds, tot, err);
if(err != nil)
error(err);
if(tot < 0)
error(Eio);
return tot;
}
/*
* halt condition was cleared on the endpoint. update our toggles.
*/
static void
clrhalt(Ep *ep)
{
Qio *io;
ep->clrhalt = 0;
switch(ep->ttype){
case Tbulk:
case Tintr:
io = ep->aux;
if(ep->mode != OREAD){
qlock(&io[OWRITE]);
io[OWRITE].toggle = Tddata0;
deprint("ep clrhalt for io %#p\n", io+OWRITE);
qunlock(&io[OWRITE]);
}
if(ep->mode != OWRITE){
qlock(&io[OREAD]);
io[OREAD].toggle = Tddata0;
deprint("ep clrhalt for io %#p\n", io+OREAD);
qunlock(&io[OREAD]);
}
break;
}
}
static long
epread(Ep *ep, void *a, long count)
{
Ctlio *cio;
Qio *io;
char buf[80];
ulong delta;
if(ep->aux == nil)
panic("epread: not open");
switch(ep->ttype){
case Tctl:
cio = ep->aux;
qlock(cio);
if(waserror()){
qunlock(cio);
nexterror();
}
ddeprint("epread ctl ndata %d\n", cio->ndata);
if(cio->ndata < 0)
error("request expected");
else if(cio->ndata == 0){
cio->ndata = -1;
count = 0;
}else{
if(count > cio->ndata)
count = cio->ndata;
if(count > 0)
memmove(a, cio->data, count);
/* BUG for big transfers */
free(cio->data);
cio->data = nil;
cio->ndata = 0; /* signal EOF next time */
}
qunlock(cio);
poperror();
if(debug>1 || ep->debug){
seprintdata(buf, buf+sizeof(buf), a, count);
print("epread: %s\n", buf);
}
return count;
case Tbulk:
io = ep->aux;
if(ep->clrhalt)
clrhalt(ep);
return epio(ep, &io[OREAD], a, count, 1);
case Tintr:
io = ep->aux;
delta = TK2MS(MACHP(0)->ticks) - io[OREAD].iotime + 1;
if(delta < ep->pollival / 2)
tsleep(&up->sleep, return0, 0, ep->pollival/2 - delta);
if(ep->clrhalt)
clrhalt(ep);
return epio(ep, &io[OREAD], a, count, 1);
case Tiso:
panic("ohci: iso read not implemented");
break;
default:
panic("epread: bad ep ttype %d", ep->ttype);
}
return -1;
}
/*
* Control transfers are one setup write (data0)
* plus zero or more reads/writes (data1, data0, ...)
* plus a final write/read with data1 to ack.
* For both host to device and device to host we perform
* the entire transfer when the user writes the request,
* and keep any data read from the device for a later read.
* We call epio three times instead of placing all Tds at
* the same time because doing so leads to crc/tmout errors
* for some devices.
* Upon errors on the data phase we must still run the status
* phase or the device may cease responding in the future.
*/
static long
epctlio(Ep *ep, Ctlio *cio, void *a, long count)
{
uchar *c;
long len;
ddeprint("epctlio: cio %#p ep%d.%d count %ld\n",
cio, ep->dev->nb, ep->nb, count);
if(count < Rsetuplen)
error("short usb command");
qlock(cio);
free(cio->data);
cio->data = nil;
cio->ndata = 0;
if(waserror()){
qunlock(cio);
free(cio->data);
cio->data = nil;
cio->ndata = 0;
nexterror();
}
/* set the address if unset and out of configuration state */
if(ep->dev->state != Dconfig && ep->dev->state != Dreset)
if(cio->usbid == 0){
cio->usbid = (ep->nb<<7)|(ep->dev->nb & Devmax);
edsetaddr(cio->ed, cio->usbid);
}
/* adjust maxpkt if the user has learned a different one */
if(edmaxpkt(cio->ed) != ep->maxpkt)
edsetmaxpkt(cio->ed, ep->maxpkt);
c = a;
cio->tok = Tdtoksetup;
cio->toggle = Tddata0;
if(epio(ep, cio, a, Rsetuplen, 0) < Rsetuplen)
error(Eio);
a = c + Rsetuplen;
count -= Rsetuplen;
cio->toggle = Tddata1;
if(c[Rtype] & Rd2h){
cio->tok = Tdtokin;
len = GET2(c+Rcount);
if(len <= 0)
error("bad length in d2h request");
if(len > Maxctllen)
error("d2h data too large to fit in ohci");
a = cio->data = smalloc(len+1);
}else{
cio->tok = Tdtokout;
len = count;
}
if(len > 0)
if(waserror())
len = -1;
else{
len = epio(ep, cio, a, len, 0);
poperror();
}
if(c[Rtype] & Rd2h){
count = Rsetuplen;
cio->ndata = len;
cio->tok = Tdtokout;
}else{
if(len < 0)
count = -1;
else
count = Rsetuplen + len;
cio->tok = Tdtokin;
}
cio->toggle = Tddata1;
epio(ep, cio, nil, 0, 0);
qunlock(cio);
poperror();
ddeprint("epctlio cio %#p return %ld\n", cio, count);
return count;
}
/*
* Put new samples in the dummy Td.
* BUG: This does only a transfer per Td. We could do up to 8.
*/
static long
putsamples(Ctlr *ctlr, Ep *ep, Isoio *iso, uchar *b, long count)
{
Td *td;
ulong n;
td = pa2ptr(iso->ed->tail);
n = count;
if(n > td->nbytes - BLEN(td->bp))
n = td->nbytes - BLEN(td->bp);
assert(td->bp->wp + n <= td->bp->lim);
memmove(td->bp->wp, b, n);
td->bp->wp += n;
if(BLEN(td->bp) == td->nbytes){ /* full Td: activate it */
ilock(ctlr);
isoadvance(ep, iso, td);
iunlock(ctlr);
}
return n;
}
static long
episowrite(Ep *ep, void *a, long count)
{
long tot, nw;
char *err;
uchar *b;
Ctlr *ctlr;
Isoio *iso;
ctlr = ep->hp->aux;
iso = ep->aux;
iso->debug = ep->debug;
qlock(iso);
if(waserror()){
qunlock(iso);
nexterror();
}
diprint("ohci: episowrite: %#p ep%d.%d\n", iso, ep->dev->nb, ep->nb);
ilock(ctlr);
if(iso->state == Qclose){
iunlock(ctlr);
error(iso->err ? iso->err : Eio);
}
iso->state = Qrun;
b = a;
for(tot = 0; tot < count; tot += nw){
while(isocanwrite(iso) == 0){
iunlock(ctlr);
diprint("ohci: episowrite: %#p sleep\n", iso);
if(waserror()){
if(iso->err == nil)
iso->err = "I/O timed out";
ilock(ctlr);
break;
}
tsleep(iso, isocanwrite, iso, ep->tmout);
poperror();
ilock(ctlr);
}
err = iso->err;
iso->err = nil;
if(iso->state == Qclose || err != nil){
iunlock(ctlr);
error(err ? err : Eio);
}
if(iso->state != Qrun)
panic("episowrite: iso not running");
iunlock(ctlr); /* We could page fault here */
nw = putsamples(ctlr, ep, iso, b+tot, count-tot);
ilock(ctlr);
}
if(iso->state != Qclose)
iso->state = Qdone;
iunlock(ctlr);
err = iso->err; /* in case it failed early */
iso->err = nil;
qunlock(iso);
poperror();
if(err != nil)
error(err);
diprint("ohci: episowrite: %#p %ld bytes\n", iso, tot);
return tot;
}
static long
epwrite(Ep *ep, void *a, long count)
{
Qio *io;
Ctlio *cio;
ulong delta;
uchar *b;
long tot, nw;
if(ep->aux == nil)
panic("ohci: epwrite: not open");
switch(ep->ttype){
case Tctl:
cio = ep->aux;
return epctlio(ep, cio, a, count);
case Tbulk:
io = ep->aux;
if(ep->clrhalt)
clrhalt(ep);
/*
* Put at most Tdatomic Tds (512 bytes) at a time.
* Otherwise some devices produce babble errors.
*/
b = a;
assert(a != nil);
for(tot = 0; tot < count ; tot += nw){
nw = count - tot;
if(nw > Tdatomic * ep->maxpkt)
nw = Tdatomic * ep->maxpkt;
nw = epio(ep, &io[OWRITE], b+tot, nw, 1);
}
return tot;
case Tintr:
io = ep->aux;
delta = TK2MS(MACHP(0)->ticks) - io[OWRITE].iotime + 1;
if(delta < ep->pollival)
tsleep(&up->sleep, return0, 0, ep->pollival - delta);
if(ep->clrhalt)
clrhalt(ep);
return epio(ep, &io[OWRITE], a, count, 1);
case Tiso:
return episowrite(ep, a, count);
default:
panic("ohci: epwrite: bad ep ttype %d", ep->ttype);
}
return -1;
}
static Ed*
newed(Ctlr *ctlr, Ep *ep, Qio *io, char *)
{
Ed *ed;
Td *td;
ed = io->ed = edalloc(); /* no errors raised here, really */
td = tdalloc();
td->ep = ep;
td->io = io;
ed->tail = ptr2pa(td);
ed->head = ptr2pa(td);
ed->tds = td;
ed->ep = ep;
ed->ctrl = (ep->maxpkt & Edmpsmask) << Edmpsshift;
if(ep->ttype == Tiso)
ed->ctrl |= Ediso;
if(waserror()){
edfree(ed);
io->ed = nil;
nexterror();
}
/* For setup endpoints we start with the config address */
if(ep->ttype != Tctl)
edsetaddr(io->ed, io->usbid);
if(ep->dev->speed == Lowspeed)
ed->ctrl |= Edlow;
switch(io->tok){
case Tdtokin:
ed->ctrl |= Edin;
break;
case Tdtokout:
ed->ctrl |= Edout;
break;
default:
ed->ctrl |= Edtddir; /* Td will say */
break;
}
switch(ep->ttype){
case Tctl:
ilock(ctlr);
edlinked(ed, ctlhd(ctlr));
setctlhd(ctlr, ed);
iunlock(ctlr);
break;
case Tbulk:
ilock(ctlr);
edlinked(ed, bulkhd(ctlr));
setbulkhd(ctlr, ed);
iunlock(ctlr);
break;
case Tintr:
case Tiso:
ilock(ctlr);
schedq(ctlr, io, ep->pollival);
iunlock(ctlr);
break;
default:
panic("ohci: newed: bad ttype");
}
poperror();
return ed;
}
static void
isoopen(Ctlr *ctlr, Ep *ep)
{
Td *td, *edtds;
Isoio *iso;
int i;
iso = ep->aux;
iso->usbid = (ep->nb<<7)|(ep->dev->nb & Devmax);
iso->bw = ep->hz * ep->samplesz; /* bytes/sec */
if(ep->mode != OWRITE){
print("ohci: bug: iso input streams not implemented\n");
error("ohci iso input streams not implemented");
}else
iso->tok = Tdtokout;
iso->left = 0;
iso->nerrs = 0;
iso->frno = TRUNC(ctlr->ohci->fmnumber + 10, Ntdframes);
iso->nframes = 1000 / ep->pollival;
if(iso->nframes < 10){
print("ohci: isoopen: less than 10 frames; using 10.\n");
iso->nframes = 10;
}
iso->navail = iso->nframes;
iso->atds = edtds = nil;
for(i = 0; i < iso->nframes-1; i++){ /* -1 for dummy */
td = tdalloc();
td->ep = ep;
td->io = iso;
td->bp = allocb(ep->maxpkt);
td->anext = iso->atds; /* link as avail */
iso->atds = td;
td->next = edtds;
edtds = td;
}
newed(ctlr, ep, iso, "iso"); /* allocates a dummy td */
iso->ed->tds->bp = allocb(ep->maxpkt); /* but not its block */
iso->ed->tds->next = edtds;
isodtdinit(ep, iso, iso->ed->tds);
}
/*
* Allocate the endpoint and set it up for I/O
* in the controller. This must follow what's said
* in Ep regarding configuration, including perhaps
* the saved toggles (saved on a previous close of
* the endpoint data file by epclose).
*/
static void
epopen(Ep *ep)
{
Ctlr *ctlr;
Qio *io;
Ctlio *cio;
ulong usbid;
ctlr = ep->hp->aux;
deprint("ohci: epopen ep%d.%d\n", ep->dev->nb, ep->nb);
if(ep->aux != nil)
panic("ohci: epopen called with open ep");
if(waserror()){
free(ep->aux);
ep->aux = nil;
nexterror();
}
switch(ep->ttype){
case Tnone:
error("endpoint not configured");
case Tiso:
ep->aux = smalloc(sizeof(Isoio));
isoopen(ctlr, ep);
break;
case Tctl:
cio = ep->aux = smalloc(sizeof(Ctlio));
cio->debug = ep->debug;
cio->ndata = -1;
cio->data = nil;
cio->tok = -1; /* invalid; Tds will say */
if(ep->dev->isroot != 0 && ep->nb == 0) /* root hub */
break;
newed(ctlr, ep, cio, "epc");
break;
case Tbulk:
ep->pollival = 1; /* assume this; doesn't really matter */
/* and fall... */
case Tintr:
io = ep->aux = smalloc(sizeof(Qio)*2);
io[OREAD].debug = io[OWRITE].debug = ep->debug;
usbid = (ep->nb<<7)|(ep->dev->nb & Devmax);
if(ep->mode != OREAD){
if(ep->toggle[OWRITE] != 0)
io[OWRITE].toggle = Tddata1;
else
io[OWRITE].toggle = Tddata0;
io[OWRITE].tok = Tdtokout;
io[OWRITE].usbid = usbid;
io[OWRITE].bw = ep->maxpkt*1000/ep->pollival; /* bytes/s */
newed(ctlr, ep, io+OWRITE, "epw");
}
if(ep->mode != OWRITE){
if(ep->toggle[OREAD] != 0)
io[OREAD].toggle = Tddata1;
else
io[OREAD].toggle = Tddata0;
io[OREAD].tok = Tdtokin;
io[OREAD].usbid = usbid;
io[OREAD].bw = ep->maxpkt*1000/ep->pollival; /* bytes/s */
newed(ctlr, ep, io+OREAD, "epr");
}
break;
}
deprint("ohci: epopen done:\n");
if(debug || ep->debug)
dump(ep->hp);
poperror();
}
static void
cancelio(Ep *ep, Qio *io)
{
Ed *ed;
Ctlr *ctlr;
ctlr = ep->hp->aux;
ilock(ctlr);
if(io == nil || io->state == Qclose){
assert(io == nil || io->ed == nil);
iunlock(ctlr);
return;
}
ed = io->ed;
io->state = Qclose;
io->err = Eio;
aborttds(io);
iunlock(ctlr);
if(!waserror()){
tsleep(&up->sleep, return0, 0, Abortdelay);
poperror();
}
wakeup(io);
qlock(io);
/* wait for epio if running */
qunlock(io);
ilock(ctlr);
switch(ep->ttype){
case Tctl:
unlinkctl(ctlr, ed);
break;
case Tbulk:
unlinkbulk(ctlr, ed);
break;
case Tintr:
case Tiso:
unschedq(ctlr, io);
break;
default:
panic("ohci cancelio: bad ttype");
}
iunlock(ctlr);
edfree(io->ed);
io->ed = nil;
}
static void
epclose(Ep *ep)
{
Ctlio *cio;
Isoio *iso;
Qio *io;
deprint("ohci: epclose ep%d.%d\n", ep->dev->nb, ep->nb);
if(ep->aux == nil)
panic("ohci: epclose called with closed ep");
switch(ep->ttype){
case Tctl:
cio = ep->aux;
cancelio(ep, cio);
free(cio->data);
cio->data = nil;
break;
case Tbulk:
case Tintr:
io = ep->aux;
if(ep->mode != OWRITE){
cancelio(ep, &io[OREAD]);
if(io[OREAD].toggle == Tddata1)
ep->toggle[OREAD] = 1;
}
if(ep->mode != OREAD){
cancelio(ep, &io[OWRITE]);
if(io[OWRITE].toggle == Tddata1)
ep->toggle[OWRITE] = 1;
}
break;
case Tiso:
iso = ep->aux;
cancelio(ep, iso);
break;
default:
panic("epclose: bad ttype %d", ep->ttype);
}
deprint("ohci: epclose ep%d.%d: done\n", ep->dev->nb, ep->nb);
free(ep->aux);
ep->aux = nil;
}
static int
portreset(Hci *hp, int port, int on)
{
Ctlr *ctlr;
Ohci *ohci;
if(on == 0)
return 0;
ctlr = hp->aux;
qlock(&ctlr->resetl);
if(waserror()){
qunlock(&ctlr->resetl);
nexterror();
}
ilock(ctlr);
ohci = ctlr->ohci;
ohci->rhportsts[port - 1] = Spp;
if((ohci->rhportsts[port - 1] & Ccs) == 0){
iunlock(ctlr);
error("port not connected");
}
ohci->rhportsts[port - 1] = Spr;
while((ohci->rhportsts[port - 1] & Prsc) == 0){
iunlock(ctlr);
dprint("ohci: portreset, wait for reset complete\n");
ilock(ctlr);
}
ohci->rhportsts[port - 1] = Prsc;
iunlock(ctlr);
poperror();
qunlock(&ctlr->resetl);
return 0;
}
static int
portenable(Hci *hp, int port, int on)
{
Ctlr *ctlr;
ctlr = hp->aux;
dprint("ohci: %#p port %d enable=%d\n", ctlr->ohci, port, on);
qlock(&ctlr->resetl);
if(waserror()){
qunlock(&ctlr->resetl);
nexterror();
}
ilock(ctlr);
if(on)
ctlr->ohci->rhportsts[port - 1] = Spe | Spp;
else
ctlr->ohci->rhportsts[port - 1] = Cpe;
iunlock(ctlr);
tsleep(&up->sleep, return0, 0, Enabledelay);
poperror();
qunlock(&ctlr->resetl);
return 0;
}
static int
portstatus(Hci *hp, int port)
{
int v;
Ctlr *ub;
ulong ohcistatus;
/*
* We must return status bits as a
* get port status hub request would do.
*/
ub = hp->aux;
ohcistatus = ub->ohci->rhportsts[port - 1];
v = 0;
if(ohcistatus & Ccs)
v |= HPpresent;
if(ohcistatus & Pes)
v |= HPenable;
if(ohcistatus & Pss)
v |= HPsuspend;
if(ohcistatus & Prs)
v |= HPreset;
else {
/* port is not in reset; these potential writes are ok */
if(ohcistatus & Csc){
v |= HPstatuschg;
ub->ohci->rhportsts[port - 1] = Csc;
}
if(ohcistatus & Pesc){
v |= HPchange;
ub->ohci->rhportsts[port - 1] = Pesc;
}
}
if(ohcistatus & Lsda)
v |= HPslow;
if(v & (HPstatuschg|HPchange))
ddprint("ohci port %d sts %#ulx hub sts %#x\n", port, ohcistatus, v);
return v;
}
static void
dumpohci(Ctlr *ctlr)
{
int i;
ulong *ohci;
ohci = &ctlr->ohci->revision;
print("ohci registers: \n");
for(i = 0; i < sizeof(Ohci)/sizeof(ulong); i++)
if(i < 3 || ohci[i] != 0)
print("\t[%#2.2x]\t%#8.8ulx\n", i * 4, ohci[i]);
print("\n");
}
static void
init(Hci *hp)
{
Ctlr *ctlr;
Ohci *ohci;
int i;
ulong ival, ctrl, fmi;
ctlr = hp->aux;
dprint("ohci %#p init\n", ctlr->ohci);
ohci = ctlr->ohci;
fmi = ctlr->ohci->fminterval;
ctlr->ohci->cmdsts = Shcr; /* reset the block */
while(ctlr->ohci->cmdsts & Shcr)
delay(1); /* wait till reset complete, Ohci says 10us max. */
ctlr->ohci->fminterval = fmi;
/*
* now that soft reset is done we are in suspend state.
* Setup registers which take in suspend state
* (will only be here for 2ms).
*/
ctlr->ohci->hcca = ptr2pa(ctlr->hcca);
setctlhd(ctlr, nil);
ctlr->ohci->ctlcurred = 0;
setbulkhd(ctlr, nil);
ctlr->ohci->bulkcurred = 0;
ohci->intrenable = Mie | Wdh | Ue;
ohci->control |= Ccle | Cble | Cple | Cie | Cfsoper;
/* set frame after operational */
ohci->rhdesca = Nps; /* no power switching */
if(ohci->rhdesca & Nps){
dprint("ohci: ports are not power switched\n");
}else{
dprint("ohci: ports are power switched\n");
ohci->rhdesca &= ~Psm;
ohci->rhsts &= ~Lpsc;
}
for(i = 0; i < ctlr->nports; i++) /* paranoia */
ohci->rhportsts[i] = 0; /* this has no effect */
delay(50);
for(i = 0; i < ctlr->nports; i++){
ohci->rhportsts[i] = Spp;
if((ohci->rhportsts[i] & Ccs) != 0)
ohci->rhportsts[i] |= Spr;
}
delay(100);
ctrl = ohci->control;
if((ctrl & Cfsmask) != Cfsoper){
ctrl = (ctrl & ~Cfsmask) | Cfsoper;
ohci->control = ctrl;
ohci->rhsts = Lpsc;
}
ival = ohci->fminterval & ~(Fmaxpktmask << Fmaxpktshift);
ohci->fminterval = ival | (5120 << Fmaxpktshift);
if(debug > 1)
dumpohci(ctlr);
}
static void
scanpci(void)
{
ulong mem;
Ctlr *ctlr;
Pcidev *p;
int i;
static int already = 0;
if(already)
return;
already = 1;
p = nil;
while(p = pcimatch(p, 0, 0)) {
/*
* Find Ohci controllers (Programming Interface = 0x10).
*/
if(p->ccrb != Pcibcserial || p->ccru != Pciscusb ||
p->ccrp != 0x10)
continue;
mem = p->mem[0].bar & ~0x0F;
dprint("ohci: %x/%x port 0x%lux size 0x%x irq %d\n",
p->vid, p->did, mem, p->mem[0].size, p->intl);
if(mem == 0){
print("ohci: failed to map registers\n");
continue;
}
if(p->intl == 0xFF || p->intl == 0) {
print("ohci: no irq assigned for port %#lux\n", mem);
continue;
}
ctlr = malloc(sizeof(Ctlr));
if (ctlr == nil)
panic("ohci: out of memory");
ctlr->pcidev = p;
ctlr->ohci = vmap(mem, p->mem[0].size);
dprint("scanpci: ctlr %#p, ohci %#p\n", ctlr, ctlr->ohci);
pcisetbme(p);
pcisetpms(p, 0);
for(i = 0; i < Nhcis; i++)
if(ctlrs[i] == nil){
ctlrs[i] = ctlr;
break;
}
if(i == Nhcis)
print("ohci: bug: no more controllers\n");
}
}
static void
usbdebug(Hci*, int d)
{
debug = d;
}
/*
* build the periodic scheduling tree:
* framesize must be a multiple of the tree size
*/
static void
mkqhtree(Ctlr *ctlr)
{
int i, n, d, o, leaf0, depth;
Ed **tree;
Qtree *qt;
depth = flog2(32);
n = (1 << (depth+1)) - 1;
qt = mallocz(sizeof(*qt), 1);
if(qt == nil)
panic("usb: can't allocate scheduling tree");
qt->nel = n;
qt->depth = depth;
qt->bw = mallocz(n * sizeof(qt->bw), 1);
qt->root = tree = mallocz(n * sizeof(Ed *), 1);
if(qt->bw == nil || qt->root == nil)
panic("usb: can't allocate scheduling tree");
for(i = 0; i < n; i++){
if((tree[i] = edalloc()) == nil)
panic("mkqhtree");
tree[i]->ctrl = (8 << Edmpsshift); /* not needed */
tree[i]->ctrl |= Edskip;
if(i > 0)
edlinked(tree[i], tree[(i-1)/2]);
else
edlinked(tree[i], nil);
}
ctlr->ntree = i;
dprint("ohci: tree: %d endpoints allocated\n", i);
/* distribute leaves evenly round the frame list */
leaf0 = n / 2;
for(i = 0; i < 32; i++){
o = 0;
for(d = 0; d < depth; d++){
o <<= 1;
if(i & (1 << d))
o |= 1;
}
if(leaf0 + o >= n){
print("leaf0=%d o=%d i=%d n=%d\n", leaf0, o, i, n);
break;
}
ctlr->hcca->intrtable[i] = ptr2pa(tree[leaf0 + o]);
}
ctlr->tree = qt;
}
static void
ohcimeminit(Ctlr *ctlr)
{
Hcca *hcca;
edfree(edalloc()); /* allocate pools now */
tdfree(tdalloc());
hcca = xspanalloc(sizeof(Hcca), 256, 0);
if(hcca == nil)
panic("usbhreset: no memory for Hcca");
memset(hcca, 0, sizeof(*hcca));
ctlr->hcca = hcca;
mkqhtree(ctlr);
}
static void
ohcireset(Ctlr *ctlr)
{
ilock(ctlr);
dprint("ohci %#p reset\n", ctlr->ohci);
/*
* usually enter here in reset, wait till its through,
* then do our own so we are on known timing conditions.
* Is this needed?
*/
delay(100);
ctlr->ohci->control = 0;
delay(100);
/* legacy support register: turn off lunacy mode */
pcicfgw16(ctlr->pcidev, 0xc0, 0x2000);
iunlock(ctlr);
}
static void
shutdown(Hci *hp)
{
Ctlr *ctlr;
ctlr = hp->aux;
ilock(ctlr);
ctlr->ohci->intrdisable = Mie;
ctlr->ohci->control = 0;
coherence();
delay(100);
iunlock(ctlr);
}
static int
reset(Hci *hp)
{
int i;
Ctlr *ctlr;
Pcidev *p;
static Lock resetlck;
if(getconf("*nousbohci"))
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 == (uintptr)ctlr->ohci){
ctlr->active = 1;
break;
}
}
iunlock(&resetlck);
if(ctlrs[i] == nil || i == Nhcis)
return -1;
if(ctlr->ohci->control == ~0)
return -1;
p = ctlr->pcidev;
hp->aux = ctlr;
hp->port = (uintptr)ctlr->ohci;
hp->irq = p->intl;
hp->tbdf = p->tbdf;
ctlr->nports = hp->nports = ctlr->ohci->rhdesca & 0xff;
ohcireset(ctlr);
ohcimeminit(ctlr);
/*
* Linkage to the generic HCI driver.
*/
hp->init = init;
hp->dump = dump;
hp->interrupt = interrupt;
hp->epopen = epopen;
hp->epclose = epclose;
hp->epread = epread;
hp->epwrite = epwrite;
hp->seprintep = seprintep;
hp->portenable = portenable;
hp->portreset = portreset;
hp->portstatus = portstatus;
hp->shutdown = shutdown;
hp->debug = usbdebug;
hp->type = "ohci";
return 0;
}
void
usbohcilink(void)
{
addhcitype("ohci", reset);
}
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