ref: a15863b8ae23a26a2f825daf6107ab92e53c2669
dir: /sys/src/9/zynq/etherzynq.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/netif.h"
#include "../port/etherif.h"
#define Rbsz ROUNDUP(sizeof(Etherpkt)+16, 64)
enum {
RXRING = 0x200,
TXRING = 0x200,
Linkdelay = 500,
MDC_DIV = 6,
};
enum {
NET_CTRL,
NET_CFG,
NET_STATUS,
DMA_CFG = 4,
TX_STATUS,
RX_QBAR,
TX_QBAR,
RX_STATUS,
INTR_STATUS,
INTR_EN,
INTR_DIS,
INTR_MASK,
PHY_MAINT,
RX_PAUSEQ,
TX_PAUSEQ,
HASH_BOT = 32,
HASH_TOP,
SPEC_ADDR1_BOT,
SPEC_ADDR1_TOP,
};
enum {
MDCTRL,
MDSTATUS,
MDID1,
MDID2,
MDAUTOADV,
MDAUTOPART,
MDAUTOEX,
MDAUTONEXT,
MDAUTOLINK,
MDGCTRL,
MDGSTATUS,
MDPHYCTRL = 0x1f,
};
enum {
/* NET_CTRL */
RXEN = 1<<2,
TXEN = 1<<3,
MDEN = 1<<4,
STARTTX = 1<<9,
/* NET_CFG */
SPEED = 1<<0,
FDEN = 1<<1,
COPYALLEN = 1<<4,
MCASTHASHEN = 1<<6,
UCASTHASHEN = 1<<7,
RX1536EN = 1<<8,
GIGE_EN = 1<<10,
RXCHKSUMEN = 1<<24,
/* NET_STATUS */
PHY_IDLE = 1<<2,
/* DMA_CFG */
TXCHKSUMEN = 1<<11,
/* TX_STATUS */
TXCOMPL = 1<<5,
/* INTR_{EN,DIS} */
MGMTDONE = 1<<0,
RXCOMPL = 1<<1,
RXUSED = 1<<2,
TXUNDER = 1<<4,
RXOVER = 1<<10,
/* MDCTRL */
MDRESET = 1<<15,
AUTONEG = 1<<12,
FULLDUP = 1<<8,
/* MDSTATUS */
LINK = 1<<2,
/* MDGSTATUS */
RECVOK = 3<<12,
};
enum {
RxUsed = 1,
TxUsed = 1<<31,
FrameEnd = 1<<15,
};
enum {
GEM0_CLK_CTRL = 0x140/4,
};
typedef struct Ctlr Ctlr;
struct Ctlr {
ulong *r;
Rendez phy;
int phyaddr;
int rxconsi, rxprodi, txi;
ulong *rxr, *txr;
Block **rxs, **txs;
Lock txlock;
int attach;
};
static int
phyidle(void *v)
{
return ((Ctlr*)v)->r[NET_STATUS] & PHY_IDLE;
}
static void
mdwrite(Ctlr *c, int r, u16int v)
{
sleep(&c->phy, phyidle, c);
c->r[PHY_MAINT] = 1<<30 | 1<<28 | 1<<17 | c->phyaddr << 23 | r << 18 | v;
sleep(&c->phy, phyidle, c);
}
static u16int
mdread(Ctlr *c, int r)
{
sleep(&c->phy, phyidle, c);
c->r[PHY_MAINT] = 1<<30 | 1<< 29 | 1<<17 | c->phyaddr << 23 | r << 18;
sleep(&c->phy, phyidle, c);
return c->r[PHY_MAINT];
}
static void
ethproc(void *ved)
{
Ether *edev;
Ctlr *c;
char *sp, *dpl;
u16int v;
edev = ved;
c = edev->ctlr;
mdwrite(c, MDCTRL, AUTONEG);
for(;;){
if((mdread(c, MDSTATUS) & LINK) == 0){
edev->link = 0;
print("eth: no link\n");
while((mdread(c, MDSTATUS) & LINK) == 0)
tsleep(&up->sleep, return0, nil, Linkdelay);
}
v = mdread(c, MDPHYCTRL);
if((v & 0x40) != 0){
sp = "1000BASE-T";
while((mdread(c, MDGSTATUS) & RECVOK) != RECVOK)
;
edev->mbps = 1000;
c->r[NET_CFG] |= GIGE_EN;
slcr[GEM0_CLK_CTRL] = 1 << 20 | 8 << 8 | 1;
}else if((v & 0x20) != 0){
sp = "100BASE-TX";
edev->mbps = 100;
c->r[NET_CFG] = c->r[NET_CFG] & ~GIGE_EN | SPEED;
slcr[GEM0_CLK_CTRL] = 5 << 20 | 8 << 8 | 1;
}else if((v & 0x10) != 0){
sp = "10BASE-T";
edev->mbps = 10;
c->r[NET_CFG] = c->r[NET_CFG] & ~(GIGE_EN | SPEED);
slcr[GEM0_CLK_CTRL] = 20 << 20 | 20 << 8 | 1;
}else
sp = "???";
if((v & 0x08) != 0){
dpl = "full";
c->r[NET_CFG] |= FDEN;
}else{
dpl = "half";
c->r[NET_CFG] &= ~FDEN;
}
edev->link = 1;
print("eth: %s %s duplex link\n", sp, dpl);
while((mdread(c, MDSTATUS) & LINK) != 0)
tsleep(&up->sleep, return0, nil, Linkdelay);
}
}
static int
replenish(Ctlr *c)
{
Block *bp;
int i;
ulong *r;
while(c->rxprodi != c->rxconsi){
i = c->rxprodi;
bp = iallocb(Rbsz);
if(bp == nil){
print("eth: out of memory for receive buffers\n");
return -1;
}
c->rxs[i] = bp;
r = &c->rxr[2 * i];
r[0] = RxUsed | PADDR(bp->rp);
if(i == RXRING - 1)
r[0] |= 2;
r[1] = 0;
cleandse(bp->base, bp->lim);
clean2pa(PADDR(bp->base), PADDR(bp->lim));
r[0] &= ~RxUsed;
c->rxprodi = (c->rxprodi + 1) & (RXRING - 1);
}
return 0;
}
static void
ethrx(Ether *edev)
{
Ctlr *c;
ulong *r;
Block *bp;
c = edev->ctlr;
// print("rx! %p %p\n", PADDR(&c->rxr[2 * c->rxconsi]), c->r[RX_QBAR]);
for(;;){
r = &c->rxr[2 * c->rxconsi];
if((r[0] & RxUsed) == 0)
break;
if((r[1] & FrameEnd) == 0)
print("eth: partial frame received -- shouldn't happen\n");
bp = c->rxs[c->rxconsi];
bp->wp = bp->rp + (r[1] & 0x1fff);
invaldse(bp->rp, bp->wp);
inval2pa(PADDR(bp->rp), PADDR(bp->wp));
etheriq(edev, bp);
c->rxconsi = (c->rxconsi + 1) & (RXRING - 1);
replenish(c);
}
}
static void
ethtx(Ether *edev)
{
Ctlr *c;
ulong *r;
Block *bp;
c = edev->ctlr;
ilock(&c->txlock);
for(;;){
r = &c->txr[2 * c->txi];
if((r[1] & TxUsed) == 0){
print("eth: transmit buffer full\n");
break;
}
bp = qget(edev->oq);
if(bp == nil)
break;
if(c->txs[c->txi] != nil)
freeb(c->txs[c->txi]);
c->txs[c->txi] = bp;
cleandse(bp->rp, bp->wp);
clean2pa(PADDR(bp->rp), PADDR(bp->wp));
r[0] = PADDR(bp->rp);
r[1] = BLEN(bp) | FrameEnd | TxUsed;
if(r == c->txr + 2 * (TXRING - 1))
r[1] |= 1<<30;
coherence();
r[1] &= ~TxUsed;
coherence();
c->r[NET_CTRL] |= STARTTX;
c->txi = (c->txi + 1) & (TXRING - 1);
}
iunlock(&c->txlock);
}
static void
ethirq(Ureg *, void *arg)
{
Ether *edev;
Ctlr *c;
ulong fl;
edev = arg;
c = edev->ctlr;
fl = c->r[INTR_STATUS];
c->r[INTR_STATUS] = fl;
if((fl & MGMTDONE) != 0)
wakeup(&c->phy);
if((fl & TXUNDER) != 0)
ethtx(edev);
if((fl & RXCOMPL) != 0)
ethrx(edev);
if((fl & RXUSED) != 0)
print("eth: DMA read RX descriptor with used bit set, shouldn't happen\n");
if((fl & RXOVER) != 0)
print("eth: RX overrun, shouldn't happen\n");
}
static void
ethprom(void *arg, int on)
{
Ether *edev;
Ctlr *c;
edev = arg;
c = edev->ctlr;
if(on)
c->r[NET_CFG] |= COPYALLEN;
else
c->r[NET_CFG] &= ~COPYALLEN;
}
static void
ethmcast(void *arg, uchar *ea, int on)
{
Ether *edev;
Ctlr *c;
u64int a;
uchar x;
edev = arg;
c = edev->ctlr;
if(edev->nmaddr == 0){
c->r[NET_CFG] &= ~MCASTHASHEN;
c->r[HASH_BOT] = 0;
c->r[HASH_TOP] = 0;
}
if(!on)
return;
a = (u64int)ea[0] | (u64int)ea[1]<<8 | (u64int)ea[2]<<16 |
(u64int)ea[3]<<24 | (u64int)ea[4]<<32 | (u64int)ea[5]<<40;
x = a ^ (a>>6) ^ (a>>12) ^ (a>>18) ^ (a>>24) ^ (a>>30) ^ (a>>36) ^ (a>>42);
x &= 63;
if(x < 32)
c->r[HASH_BOT] |= 1<<x;
else
c->r[HASH_TOP] |= 1<<(x-32);
c->r[NET_CFG] |= MCASTHASHEN;
}
static int
ethinit(Ether *edev)
{
Ctlr *c;
int i;
c = edev->ctlr;
c->r[NET_CTRL] = 0;
c->r[RX_STATUS] = 0xf;
c->r[TX_STATUS] = 0xff;
c->r[INTR_DIS] = 0x7FFFEFF;
c->r[NET_CFG] = MDC_DIV << 18 | FDEN | SPEED | RX1536EN | GIGE_EN | RXCHKSUMEN;
c->r[SPEC_ADDR1_BOT] = edev->ea[0] | edev->ea[1] << 8 | edev->ea[2] << 16 | edev->ea[3] << 24;
c->r[SPEC_ADDR1_TOP] = edev->ea[4] | edev->ea[5] << 8;
c->r[DMA_CFG] = TXCHKSUMEN | (Rbsz/64) << 16 | 1 << 10 | 3 << 8 | 0x10;
c->rxr = ucalloc(8 * RXRING);
c->txr = ucalloc(8 * TXRING);
c->rxs = xspanalloc(4 * RXRING, 4, 0);
c->txs = xspanalloc(4 * TXRING, 4, 0);
for(i = 0; i < 2 * RXRING; ){
c->rxr[i++] = 1;
c->rxr[i++] = 0;
}
c->rxconsi = 1;
replenish(c);
c->rxconsi = 0;
replenish(c);
for(i = 0; i < 2 * TXRING; ){
c->txr[i++] = 0;
c->txr[i++] = 1<<31;
}
c->txr[2 * (TXRING - 1)] |= 1<<30;
c->r[RX_QBAR] = PADDR(c->rxr);
c->r[TX_QBAR] = PADDR(c->txr);
c->r[NET_CTRL] = MDEN | TXEN | RXEN;
c->r[INTR_EN] = MGMTDONE | TXUNDER | RXCOMPL | RXUSED | RXOVER;
return 0;
}
static void
ethattach(Ether *edev)
{
Ctlr *c;
c = edev->ctlr;
if(c->attach)
return;
c->attach = 1;
kproc("ethproc", ethproc, edev);
}
static int
etherpnp(Ether *edev)
{
static Ctlr ct;
static uchar mac[] = {0x0e, 0xa7, 0xde, 0xad, 0xbe, 0xef};
if(ct.r != nil)
return -1;
memmove(edev->ea, mac, 6);
edev->ctlr = &ct;
edev->port = ETH0_BASE;
ct.r = vmap(edev->port, BY2PG);
edev->irq = ETH0IRQ;
edev->ctlr = &ct;
edev->transmit = ethtx;
edev->attach = ethattach;
edev->promiscuous = ethprom;
edev->multicast = ethmcast;
edev->arg = edev;
edev->mbps = 1000;
if(ethinit(edev) < 0){
edev->ctlr = nil;
return -1;
}
intrenable(edev->irq, ethirq, edev, LEVEL, edev->name);
return 0;
}
void
etherzynqlink(void)
{
addethercard("eth", etherpnp);
}