netjet.c

arm平台上的uclinux系统全部源代码

	bcs->tx_cnt -= bcs->tx_skb->len;
	bcs->hw.tiger.sp = bcs->hw.tiger.sendbuf;
	return(0);
}

static void got_frame(struct BCState *bcs, int count) {
	struct sk_buff *skb;
		
	if (!(skb = dev_alloc_skb(count)))
		printk(KERN_WARNING "TIGER: receive out of memory\n");
	else {
		SET_SKB_FREE(skb);
		memcpy(skb_put(skb, count), bcs->hw.tiger.rcvbuf, count);
		skb_queue_tail(&bcs->rqueue, skb);
	}
	bcs->event |= 1 << B_RCVBUFREADY;
	queue_task(&bcs->tqueue, &tq_immediate);
	mark_bh(IMMEDIATE_BH);
	
	if (bcs->cs->debug & L1_DEB_RECEIVE_FRAME)
		printframe(bcs->cs, bcs->hw.tiger.rcvbuf, count, "rec");
}



static void read_raw(struct BCState *bcs, u_int *buf, int cnt){
	int i;
	register u_char j;
	register u_char val;
	u_int  *pend = bcs->hw.tiger.rec +NETJET_DMA_SIZE -1;
	register u_char state = bcs->hw.tiger.r_state;
	register u_char r_one = bcs->hw.tiger.r_one;
	register u_char r_val = bcs->hw.tiger.r_val;
	register u_int bitcnt = bcs->hw.tiger.r_bitcnt;
	u_int *p = buf;
        
	for (i=0;i<cnt;i++) {
		val = bcs->channel ? ((*p>>8) & 0xff) : (*p & 0xff);
		p++;
		if (p > pend)
			p = bcs->hw.tiger.rec;
		if (val == 0xff) {
			state = HDLC_ZERO_SEARCH;
			bcs->hw.tiger.r_tot++;
			bitcnt = 0;
			r_one = 0;
			continue;
		}
		for (j=0;j<8;j++) {
			if (state == HDLC_ZERO_SEARCH) {
				if (val & 1) {
					r_one++;
				} else {
					r_one=0;
					state= HDLC_FLAG_SEARCH;
					if (bcs->cs->debug & L1_DEB_HSCX)
						debugl1(bcs->cs,"tiger read_raw: zBit(%d,%d,%d) %x",
							bcs->hw.tiger.r_tot,i,j,val);
				}
			} else if (state == HDLC_FLAG_SEARCH) { 
				if (val & 1) {
					r_one++;
					if (r_one>6) {
						state=HDLC_ZERO_SEARCH;
					}
				} else {
					if (r_one==6) {
						bitcnt=0;
						r_val=0;
						state=HDLC_FLAG_FOUND;
						if (bcs->cs->debug & L1_DEB_HSCX)
							debugl1(bcs->cs,"tiger read_raw: flag(%d,%d,%d) %x",
								bcs->hw.tiger.r_tot,i,j,val);
					}
					r_one=0;
				}
			} else if (state ==  HDLC_FLAG_FOUND) {
				if (val & 1) {
					r_one++;
					if (r_one>6) {
						state=HDLC_ZERO_SEARCH;
					} else {
						r_val >>= 1;
						r_val |= 0x80;
						bitcnt++;
					}
				} else {
					if (r_one==6) {
						bitcnt=0;
						r_val=0;
						r_one=0;
						val >>= 1;
						continue;
					} else if (r_one!=5) {
						r_val >>= 1;
						r_val &= 0x7f;
						bitcnt++;
					}
					r_one=0;	
				}
				if ((state != HDLC_ZERO_SEARCH) &&
					!(bitcnt & 7)) {
					state=HDLC_FRAME_FOUND;
					bcs->hw.tiger.r_fcs = PPP_INITFCS;
					bcs->hw.tiger.rcvbuf[0] = r_val;
					bcs->hw.tiger.r_fcs = PPP_FCS (bcs->hw.tiger.r_fcs, r_val);
					if (bcs->cs->debug & L1_DEB_HSCX)
						debugl1(bcs->cs,"tiger read_raw: byte1(%d,%d,%d) rval %x val %x i %x",
							bcs->hw.tiger.r_tot,i,j,r_val,val,
							bcs->cs->hw.njet.irqstat0);
				}
			} else if (state ==  HDLC_FRAME_FOUND) {
				if (val & 1) {
					r_one++;
					if (r_one>6) {
						state=HDLC_ZERO_SEARCH;
						bitcnt=0;
					} else {
						r_val >>= 1;
						r_val |= 0x80;
						bitcnt++;
					}
				} else {
					if (r_one==6) {
						r_val=0; 
						r_one=0;
						bitcnt++;
						if (bitcnt & 7) {
							debugl1(bcs->cs, "tiger: frame not byte aligned");
							state=HDLC_FLAG_SEARCH;
							bcs->hw.tiger.r_err++;
						} else {
							if (bcs->cs->debug & L1_DEB_HSCX)
								debugl1(bcs->cs,"tiger frame end(%d,%d): fcs(%x) i %x",
									i,j,bcs->hw.tiger.r_fcs, bcs->cs->hw.njet.irqstat0);
							if (bcs->hw.tiger.r_fcs == PPP_GOODFCS) {
								got_frame(bcs, (bitcnt>>3)-3);
							} else
								if (bcs->cs->debug) {
									debugl1(bcs->cs, "tiger FCS error");
									printframe(bcs->cs, bcs->hw.tiger.rcvbuf,
										(bitcnt>>3)-1, "rec");
									bcs->hw.tiger.r_err++;
								}
							state=HDLC_FLAG_FOUND;
						}
						bitcnt=0;
					} else if (r_one==5) {
						val >>= 1;
						r_one=0;
						continue;
					} else {
						r_val >>= 1;
						r_val &= 0x7f;
						bitcnt++;
					}
					r_one=0;	
				}
				if ((state == HDLC_FRAME_FOUND) &&
					!(bitcnt & 7)) {
					if ((bitcnt>>3)>=HSCX_BUFMAX) {
						debugl1(bcs->cs, "tiger: frame to big");
						r_val=0; 
						state=HDLC_FLAG_SEARCH;
						bcs->hw.tiger.r_err++;
					} else {
						bcs->hw.tiger.rcvbuf[(bitcnt>>3)-1] = r_val;
						bcs->hw.tiger.r_fcs = 
							PPP_FCS (bcs->hw.tiger.r_fcs, r_val);
					}
				}
			}
			val >>= 1;
		}
		bcs->hw.tiger.r_tot++;
	}
	bcs->hw.tiger.r_state = state;
	bcs->hw.tiger.r_one = r_one;
	bcs->hw.tiger.r_val = r_val;
	bcs->hw.tiger.r_bitcnt = bitcnt;
}

static void read_tiger(struct IsdnCardState *cs) {
	u_int *p;
	int cnt = NETJET_DMA_SIZE/2;
	
	if ((cs->hw.njet.irqstat0 & cs->hw.njet.last_is0) & NETJET_IRQM0_READ) {
		debugl1(cs,"tiger warn read double dma %x/%x",
			cs->hw.njet.irqstat0, cs->hw.njet.last_is0);
		return;
	} else {
		cs->hw.njet.last_is0 &= ~NETJET_IRQM0_READ;
		cs->hw.njet.last_is0 |= (cs->hw.njet.irqstat0 & NETJET_IRQM0_READ);
	}	
	if (cs->hw.njet.irqstat0 & NETJET_IRQM0_READ_1)
		p = cs->bcs[0].hw.tiger.rec + NETJET_DMA_SIZE - 1;
	else
		p = cs->bcs[0].hw.tiger.rec + cnt - 1;
	if (cs->bcs[0].mode == L1_MODE_HDLC)
		read_raw(cs->bcs, p, cnt);
	if (cs->bcs[1].mode == L1_MODE_HDLC)
		read_raw(cs->bcs + 1, p, cnt);
	cs->hw.njet.irqstat0 &= ~NETJET_IRQM0_READ;
}

static void write_raw(struct BCState *bcs, u_int *buf, int cnt);

static void fill_dma(struct BCState *bcs)
{
	register u_int *p, *sp;
	register int cnt;

	if (!bcs->tx_skb)
		return;
	if (bcs->cs->debug & L1_DEB_HSCX)
		debugl1(bcs->cs,"tiger fill_dma1: c%d %4x", bcs->channel,
			bcs->Flag);
	if (test_and_set_bit(BC_FLG_BUSY, &bcs->Flag))
		return;
	if (make_raw_data(bcs))
		return;		
	if (bcs->cs->debug & L1_DEB_HSCX)
		debugl1(bcs->cs,"tiger fill_dma2: c%d %4x", bcs->channel,
			bcs->Flag);
	if (test_and_clear_bit(BC_FLG_NOFRAME, &bcs->Flag)) {
		write_raw(bcs, bcs->hw.tiger.sendp, bcs->hw.tiger.free);
	} else if (test_and_clear_bit(BC_FLG_HALF, &bcs->Flag)) {
		p = bus_to_virt(inl(bcs->cs->hw.njet.base + NETJET_DMA_READ_ADR));
		sp = bcs->hw.tiger.sendp;
		if (p == bcs->hw.tiger.s_end)
			p = bcs->hw.tiger.send -1;
		if (sp == bcs->hw.tiger.s_end)
			sp = bcs->hw.tiger.send -1;
		cnt = p - sp;
		if (cnt <0) {
			write_raw(bcs, bcs->hw.tiger.sendp, bcs->hw.tiger.free);
		} else {
			p++;
			cnt++;
			if (p > bcs->hw.tiger.s_end)
				p = bcs->hw.tiger.send;
			p++;
			cnt++;
			if (p > bcs->hw.tiger.s_end)
				p = bcs->hw.tiger.send;
			write_raw(bcs, p, bcs->hw.tiger.free - cnt);
		}
	} else if (test_and_clear_bit(BC_FLG_EMPTY, &bcs->Flag)) {
		p = bus_to_virt(inl(bcs->cs->hw.njet.base + NETJET_DMA_READ_ADR));
		cnt = bcs->hw.tiger.s_end - p;
		if (cnt < 2) {
			p = bcs->hw.tiger.send + 1;
			cnt = NETJET_DMA_SIZE/2 - 2;
		} else {
			p++;
			p++;
			if (cnt <= (NETJET_DMA_SIZE/2))
				cnt += NETJET_DMA_SIZE/2;
			cnt--;
			cnt--;
		}
		write_raw(bcs, p, cnt);
	}
	if (bcs->cs->debug & L1_DEB_HSCX)
		debugl1(bcs->cs,"tiger fill_dma3: c%d %4x", bcs->channel,
			bcs->Flag);
}

static void write_raw(struct BCState *bcs, u_int *buf, int cnt) {
	u_int mask, val, *p=buf;
	u_int i, s_cnt;
        
        if (cnt <= 0)
        	return;
	if (test_bit(BC_FLG_BUSY, &bcs->Flag)) {
		if (bcs->hw.tiger.sendcnt> cnt) {
			s_cnt = cnt;
			bcs->hw.tiger.sendcnt -= cnt;
		} else {
			s_cnt = bcs->hw.tiger.sendcnt;
			bcs->hw.tiger.sendcnt = 0;
		}
		if (bcs->channel)
			mask = 0xffff00ff;
		else
			mask = 0xffffff00;
		for (i=0; i<s_cnt; i++) {
			val = bcs->channel ? ((bcs->hw.tiger.sp[i] <<8) & 0xff00) :
				(bcs->hw.tiger.sp[i]);
			*p   &= mask;
			*p++ |= val;
			if (p>bcs->hw.tiger.s_end)
				p = bcs->hw.tiger.send;
		}
		bcs->hw.tiger.s_tot += s_cnt;
		if (bcs->cs->debug & L1_DEB_HSCX)
			debugl1(bcs->cs,"tiger write_raw: c%d %x-%x %d/%d %d %x", bcs->channel,
				(u_int)buf, (u_int)p, s_cnt, cnt,
				bcs->hw.tiger.sendcnt, bcs->cs->hw.njet.irqstat0);
		if (bcs->cs->debug & L1_DEB_HSCX_FIFO)
			printframe(bcs->cs, bcs->hw.tiger.sp, s_cnt, "snd");
		bcs->hw.tiger.sp += s_cnt;
		bcs->hw.tiger.sendp = p;
		if (!bcs->hw.tiger.sendcnt) {
			if (!bcs->tx_skb) {
				debugl1(bcs->cs,"tiger write_raw: NULL skb s_cnt %d", s_cnt);
			} else {
				if (bcs->st->lli.l1writewakeup &&
					(PACKET_NOACK != bcs->tx_skb->pkt_type))
					bcs->st->lli.l1writewakeup(bcs->st, bcs->tx_skb->len);
				dev_kfree_skb(bcs->tx_skb, FREE_WRITE);
				bcs->tx_skb = NULL;
			}
			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
			bcs->hw.tiger.free = cnt - s_cnt;
			if (bcs->hw.tiger.free > (NETJET_DMA_SIZE/2))
				test_and_set_bit(BC_FLG_HALF, &bcs->Flag);
			else {
				test_and_clear_bit(BC_FLG_HALF, &bcs->Flag);
				test_and_set_bit(BC_FLG_NOFRAME, &bcs->Flag);
			}
			if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
				fill_dma(bcs);
			} else {
				mask ^= 0xffffffff;
				if (s_cnt < cnt) {
					for (i=s_cnt; i<cnt;i++) {
						*p++ |= mask;
						if (p>bcs->hw.tiger.s_end)
							p = bcs->hw.tiger.send;
					}
					if (bcs->cs->debug & L1_DEB_HSCX)
						debugl1(bcs->cs, "tiger write_raw: fill rest %d",
							cnt - s_cnt);
				}
				bcs->event |= 1 << B_XMTBUFREADY;
				queue_task(&bcs->tqueue, &tq_immediate);
				mark_bh(IMMEDIATE_BH);
			}
		}
	} else if (test_and_clear_bit(BC_FLG_NOFRAME, &bcs->Flag)) {
		test_and_set_bit(BC_FLG_HALF, &bcs->Flag);
		fill_mem(bcs, buf, cnt, bcs->channel, 0xff);
		bcs->hw.tiger.free += cnt;
		if (bcs->cs->debug & L1_DEB_HSCX)
			debugl1(bcs->cs,"tiger write_raw: fill half");
	} else if (test_and_clear_bit(BC_FLG_HALF, &bcs->Flag)) {
		test_and_set_bit(BC_FLG_EMPTY, &bcs->Flag);
		fill_mem(bcs, buf, cnt, bcs->channel, 0xff);
		if (bcs->cs->debug & L1_DEB_HSCX)
			debugl1(bcs->cs,"tiger write_raw: fill full");
	}
}

static void write_tiger(struct IsdnCardState *cs) {
	u_int *p, cnt = NETJET_DMA_SIZE/2;
	
	if ((cs->hw.njet.irqstat0 & cs->hw.njet.last_is0) & NETJET_IRQM0_WRITE) {
		debugl1(cs,"tiger warn write double dma %x/%x",
			cs->hw.njet.irqstat0, cs->hw.njet.last_is0);
		return;
	} else {
		cs->hw.njet.last_is0 &= ~NETJET_IRQM0_WRITE;
		cs->hw.njet.last_is0 |= (cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE);
	}	
	if (cs->hw.njet.irqstat0  & NETJET_IRQM0_WRITE_1)
		p = cs->bcs[0].hw.tiger.send + NETJET_DMA_SIZE - 1;
	else
		p = cs->bcs[0].hw.tiger.send + cnt - 1;
	if (cs->bcs[0].mode == L1_MODE_HDLC)
		write_raw(cs->bcs, p, cnt);
	if (cs->bcs[1].mode == L1_MODE_HDLC)
		write_raw(cs->bcs + 1, p, cnt);
	cs->hw.njet.irqstat0 &= ~NETJET_IRQM0_WRITE;
}

static void
tiger_l2l1(struct PStack *st, int pr, void *arg)
{
	struct sk_buff *skb = arg;
	long flags;

	switch (pr) {
		case (PH_DATA | REQUEST):
			save_flags(flags);
			cli();