ref: 83246e296ea433b65b9d295b5e08fedd39ff1ab7
dir: /os/cerf405/mal.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
/*
* on the 405EP the MAL is used only by the Ethernet
* but we keep it separate even so
*/
enum {
Nrxchan= 2,
Ntxchan= 4,
Maxchan = 4
};
enum {
/* device control registers */
Cfg= 0x180, /* configuration register */
Esr= 0x181, /* error status register */
Ier= 0x182, /* interrupt enable register */
Txcasr= 0x184, /* transmit channel active set register */
Txcarr= 0x185, /* transmit channel active reset register */
Txeobisr= 0x186, /* transmit end of buffer interrupt status register */
Txdeir= 0x187, /* transmit descriptor error interrupt register */
Rxcasr= 0x190, /* receive channel active set register */
Rxcarr= 0x191, /* receive channel active reset register */
Rxeobisr= 0x192, /* receive channel descriptor error interrupt register */
Rxdeir= 0x193, /* receive descriptor error interrupt register */
};
#define TXCTPR(n) (0x1A0+(n)) /* transmit channel table pointer register */
#define RXCTPR(n) (0x1C0+(n)) /* receive channel table pointer register */
#define RCBS(n) (0x1E0+(n)) /* receive channel buffer size register */
enum {
/* configuration */
CfgSr= 1<<31, /* software reset */
CfgPlbp0= 0<<22, /* PLB priority (0=lowest) */
CfgPlbp1= 1<<22,
CfgPlbp2= 2<<22,
CfgPlbp3= 3<<22,
CfgGa= 1<<21, /* guarded */
CfgOa= 1<<20, /* ordered */
CfgPlble= 1<<19, /* lock error */
CfgPlbt_f= 0xF<<15, /* latency timer field */
CfgPlbt_s= 15, /* latency timer (shift) */
CfgPlbb= 1<<14, /* burst enable */
CfgOpbbl= 1<<7, /* OPB locked */
CfgOepie= 1<<2, /* interrupt on every end of packet */
CfgLea= 1<<1, /* locked error active */
CfgSd= 1<<0, /* scroll to next packet on early termination */
/* error status */
EsrEvb= 1<<31, /* error valid bit */
EsrCid_f= 0x7F<<25, /* field: channel ID causing lock error */
EsrDe= 1<<20, /* descriptor error */
EsrOne= 1<<19, /* OPB non-fullword error */
EsrOte= 1<<18, /* OPB timeout error */
EsrOse= 1<<17, /* OPB slave error */
EsrPein= 1<<16, /* PLB bus error indication */
EsrDei= 1<<4, /* descriptor error interrupt */
EsrOnei= 1<<3, /* OPB non-fulword error interrupt */
EsrOtei= 1<<2, /* OPB timeout error interrupt */
EsrOsei= 1<<1, /* OPB slave error interrupt */
EsrPbei= 1<<0, /* OPB bus error interrupt */
};
typedef struct Malmem Malmem;
struct Malmem {
Lock;
BD* base;
BD* limit;
BD* avail;
};
static Malmem malmem;
static Mal* malchans[2][Maxchan];
static void
errorintr(Ureg*, void*)
{
ulong esr, rxdeir, txdeir;
/* mal de tête */
esr = getdcr(Esr);
txdeir = getdcr(Txdeir);
rxdeir = getdcr(Rxdeir);
iprint("mal: esr=%8.8lux txdeir=%8.8lux rxdeir=%8.8lux\n", esr, txdeir, rxdeir);
putdcr(Rxdeir, rxdeir);
putdcr(Txdeir, txdeir);
putdcr(Esr, esr);
}
static void
scanintr(Ureg *ur, ulong ir, Mal *chans[])
{
Mal *ml;
int i;
for(i=0; ir != 0 && i < Maxchan; i++)
if(ir & IBIT(i)){
ir &= ~IBIT(i);
ml = chans[i];
if(ml != nil && ml->interrupt != nil)
ml->interrupt(ur, ml->arg);
/* unexpected interrupt otherwise */
}
}
static void
txinterrupt(Ureg *ur, void*)
{
ulong ir;
ir = getdcr(Txeobisr);
putdcr(Txeobisr, ir);
scanintr(ur, ir, malchans[1]);
}
static void
rxinterrupt(Ureg *ur, void*)
{
ulong ir;
ir = getdcr(Rxeobisr);
putdcr(Rxeobisr, ir);
scanintr(ur, ir, malchans[0]);
}
void
ioinit(void)
{
int i;
putdcr(Txcarr, ~0);
putdcr(Rxcarr, ~0);
/* reset */
putdcr(Cfg, CfgSr);
while(getdcr(Cfg) & CfgSr)
; /* at most one system clock */
/* clear these out whilst we're at it */
for(i=0; i<Nrxchan; i++){
putdcr(RCBS(i), 0);
putdcr(RXCTPR(i), 0);
}
for(i=0; i<Ntxchan; i++)
putdcr(TXCTPR(i), 0);
putdcr(Cfg, (0xF<<CfgPlbt_s)|CfgPlbb); /* TO DO: check */
/* Ier */
intrenable(VectorMALSERR, errorintr, nil, BUSUNKNOWN, "malserr");
intrenable(VectorMALTXDE, errorintr, nil, BUSUNKNOWN, "maltxde");
intrenable(VectorMALRXDE, errorintr, nil, BUSUNKNOWN, "malrxde");
intrenable(VectorMALTXEOB, txinterrupt, nil, BUSUNKNOWN, "maltxeob");
intrenable(VectorMALRXEOB, rxinterrupt, nil, BUSUNKNOWN, "malrxeob");
putdcr(Ier, EsrDei | EsrOnei | EsrOtei | EsrOsei | EsrPbei);
}
Mal*
malchannel(int n, int tx, void (*intr)(Ureg*, void*), void *arg)
{
Mal *ml;
if((ml = malchans[tx][n]) == nil){
ml = malloc(sizeof(*m));
malchans[tx][n] = ml;
}
ml->n = n;
ml->tx = tx;
ml->len = 1;
ml->arg = arg;
ml->interrupt = intr;
return ml;
}
void
maltxreset(Mal *ml)
{
putdcr(Txcarr, IBIT(ml->n));
}
void
maltxinit(Mal *ml, Ring *r)
{
putdcr(TXCTPR(ml->n), PADDR(r->tdr));
}
void
maltxenable(Mal *ml)
{
putdcr(Txcasr, getdcr(Txcasr) | IBIT(ml->n));
}
void
malrxreset(Mal *ml)
{
putdcr(Rxcarr, IBIT(ml->n));
}
void
malrxinit(Mal *ml, Ring *r, ulong limit)
{
putdcr(RXCTPR(ml->n), PADDR(r->rdr));
putdcr(RCBS(ml->n), limit);
}
void
malrxenable(Mal *ml)
{
putdcr(Rxcasr, getdcr(Rxcasr) | IBIT(ml->n));
}
/*
* initialise receive and transmit buffer rings
* to use both Emacs, or two channels per emac, we'll need
* to allocate all rx descriptors at once, and all tx descriptors at once,
* in a region where all addresses have the same bits 0-12(!);
* see p 20-34. of the MAL chapter.
*
* the ring entries must be aligned on sizeof(BD) boundaries
* rings must be uncached, and buffers must align with cache lines since the cache doesn't snoop
*
* thus, we initialise it once for all, then hand it out as requested.
*/
void
ioringreserve(int nrx, ulong nrb, int ntx, ulong ntb)
{
ulong nb, nbd;
lock(&malmem);
if(malmem.base == nil){
nbd = nrx*nrb + ntx*ntb;
nb = mmumapsize(nbd*sizeof(BD));
/*
* the data sheet says in the description of buffer tables that they must be on a 4k boundary,
* but the pointer register descriptions say 8 bytes; it seems to be the latter.
*/
malmem.base = mmucacheinhib(xspanalloc(nb, nb, 1<<19), nb);
malmem.limit = malmem.base + nbd;
malmem.avail = malmem.base;
if((PADDR(malmem.base)&~0x7FFFF) != (PADDR(malmem.base)&~0x7FFFF))
print("mal: trouble ahead?\n");
}
unlock(&malmem);
if(malmem.base == nil)
panic("ioringreserve");
}
BD*
bdalloc(ulong nd)
{
BD *b;
lock(&malmem);
b = malmem.avail;
if(b+nd > malmem.limit)
b = nil;
else
malmem.avail = b+nd;
unlock(&malmem);
return b;
}
int
ioringinit(Ring* r, int nrdre, int ntdre)
{
int i;
/* buffers must align with cache lines since the cache doesn't snoop */
r->nrdre = nrdre;
if(r->rdr == nil)
r->rdr = bdalloc(nrdre);
if(r->rxb == nil)
r->rxb = malloc(nrdre*sizeof(Block*));
if(r->rdr == nil || r->rxb == nil)
return -1;
for(i = 0; i < nrdre; i++){
r->rxb[i] = nil;
r->rdr[i].length = 0;
r->rdr[i].addr = 0;
r->rdr[i].status = BDEmpty|BDInt;
}
r->rdr[i-1].status |= BDWrap;
r->rdrx = 0;
r->ntdre = ntdre;
if(r->tdr == nil)
r->tdr = bdalloc(ntdre);
if(r->txb == nil)
r->txb = malloc(ntdre*sizeof(Block*));
if(r->tdr == nil || r->txb == nil)
return -1;
for(i = 0; i < ntdre; i++){
r->txb[i] = nil;
r->tdr[i].addr = 0;
r->tdr[i].length = 0;
r->tdr[i].status = 0;
}
r->tdr[i-1].status |= BDWrap;
r->tdrh = 0;
r->tdri = 0;
r->ntq = 0;
return 0;
}
void
dumpmal(void)
{
int i;
iprint("Cfg=%8.8lux\n", getdcr(Cfg));
iprint("Esr=%8.8lux\n", getdcr(Esr));
iprint("Ier=%8.8lux\n", getdcr(Ier));
iprint("Txcasr=%8.8lux\n", getdcr(Txcasr));
iprint("Txcarr=%8.8lux\n", getdcr(Txcarr));
iprint("Txeobisr=%8.8lux\n", getdcr(Txeobisr));
iprint("Txdeir=%8.8lux\n", getdcr(Txdeir));
iprint("Rxcasr=%8.8lux\n", getdcr(Rxcasr));
iprint("Rxcarr=%8.8lux\n", getdcr(Rxcarr));
iprint("Rxeobisr=%8.8lux\n", getdcr(Rxeobisr));
iprint("Rxdeir=%8.8lux\n", getdcr(Rxdeir));
for(i=0; i<Nrxchan; i++)
iprint("Rxctpr[%d]=%8.8lux Rcbs[%d]=%8.8lux\n", i, getdcr(RXCTPR(i)), i, getdcr(RCBS(i)));
for(i=0;i<Ntxchan; i++)
iprint("Txctpr[%d]=%8.8lux\n", i, getdcr(TXCTPR(i)));
}