ni52.c

powerpc内核mpc8241linux系统下net驱动程序

					}
					else
						p->stats.rx_dropped++;
				}
				else
				{
					int rstat;
						 /* free all RBD's until RBD_LAST is set */
					totlen = 0;
					while(!((rstat=rbd->status) & RBD_LAST))
					{
						totlen += rstat & RBD_MASK;
						if(!rstat)
						{
							printk("%s: Whoops .. no end mark in RBD list\n",dev->name);
							break;
						}
						rbd->status = 0;
						rbd = (struct rbd_struct *) make32(rbd->next);
					}
					totlen += rstat & RBD_MASK;
					rbd->status = 0;
					printk("%s: received oversized frame! length: %d\n",dev->name,totlen);
					p->stats.rx_dropped++;
			 }
		}
		else /* frame !(ok), only with 'save-bad-frames' */
		{
			printk("%s: oops! rfd-error-status: %04x\n",dev->name,status);
			p->stats.rx_errors++;
		}
		p->rfd_top->stat_high = 0;
		p->rfd_top->last = RFD_SUSP; /* maybe exchange by RFD_LAST */
		p->rfd_top->rbd_offset = 0xffff;
		p->rfd_last->last = 0;				/* delete RFD_SUSP	*/
		p->rfd_last = p->rfd_top;
		p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next); /* step to next RFD */
		p->scb->rfa_offset = make16(p->rfd_top);

		if(debuglevel > 0)
			printk("%d",cnt++);
	}

	if(automatic_resume)
	{
		WAIT_4_SCB_CMD();
		p->scb->cmd_ruc = RUC_RESUME;
		ni_attn586();
		WAIT_4_SCB_CMD_RUC();
	}

#ifdef WAIT_4_BUSY
	{
		int i;
		for(i=0;i<1024;i++)
		{
			if(p->rfd_top->status)
				break;
			DELAY_16();
			if(i == 1023)
				printk("%s: RU hasn't fetched next RFD (not busy/complete)\n",dev->name);
		}
	}
#endif

#if 0
	if(!at_least_one)
	{
		int i;
		volatile struct rfd_struct *rfds=p->rfd_top;
		volatile struct rbd_struct *rbds;
		printk("%s: received a FC intr. without having a frame: %04x %d\n",dev->name,status,old_at_least);
		for(i=0;i< (p->num_recv_buffs+4);i++)
		{
			rbds = (struct rbd_struct *) make32(rfds->rbd_offset);
			printk("%04x:%04x ",rfds->status,rbds->status);
			rfds = (struct rfd_struct *) make32(rfds->next);
		}
		printk("\nerrs: %04x %04x stat: %04x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->status);
		printk("\nerrs: %04x %04x rus: %02x, cus: %02x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->rus,(int)p->scb->cus);
	}
	old_at_least = at_least_one;
#endif

	if(debuglevel > 0)
		printk("r");
}

/**********************************************************
 * handle 'Receiver went not ready'.
 */

static void ni52_rnr_int(struct device *dev)
{
	struct priv *p = (struct priv *) dev->priv;

	p->stats.rx_errors++;

	WAIT_4_SCB_CMD();		/* wait for the last cmd, WAIT_4_FULLSTAT?? */
	p->scb->cmd_ruc = RUC_ABORT; /* usually the RU is in the 'no resource'-state .. abort it now. */
	ni_attn586();
	WAIT_4_SCB_CMD_RUC();		/* wait for accept cmd. */

	alloc_rfa(dev,(char *)p->rfd_first);
/* maybe add a check here, before restarting the RU */
	startrecv586(dev); /* restart RU */

	printk("%s: Receive-Unit restarted. Status: %04x\n",dev->name,p->scb->rus);

}

/**********************************************************
 * handle xmit - interrupt
 */

static void ni52_xmt_int(struct device *dev)
{
	int status;
	struct priv *p = (struct priv *) dev->priv;

	if(debuglevel > 0)
		printk("X");

	status = p->xmit_cmds[p->xmit_last]->cmd_status;
	if(!(status & STAT_COMPL))
		printk("%s: strange .. xmit-int without a 'COMPLETE'\n",dev->name);

	if(status & STAT_OK)
	{
		p->stats.tx_packets++;
		p->stats.collisions += (status & TCMD_MAXCOLLMASK);
	}
	else
	{
		p->stats.tx_errors++;
		if(status & TCMD_LATECOLL) {
			printk("%s: late collision detected.\n",dev->name);
			p->stats.collisions++;
		}
		else if(status & TCMD_NOCARRIER) {
			p->stats.tx_carrier_errors++;
			printk("%s: no carrier detected.\n",dev->name);
		}
		else if(status & TCMD_LOSTCTS)
			printk("%s: loss of CTS detected.\n",dev->name);
		else if(status & TCMD_UNDERRUN) {
			p->stats.tx_fifo_errors++;
			printk("%s: DMA underrun detected.\n",dev->name);
		}
		else if(status & TCMD_MAXCOLL) {
			printk("%s: Max. collisions exceeded.\n",dev->name);
			p->stats.collisions += 16;
		}
	}

#if (NUM_XMIT_BUFFS > 1)
	if( (++p->xmit_last) == NUM_XMIT_BUFFS)
		p->xmit_last = 0;
#endif

	dev->tbusy = 0;
	mark_bh(NET_BH);
}

/***********************************************************
 * (re)start the receiver
 */

static void startrecv586(struct device *dev)
{
	struct priv *p = (struct priv *) dev->priv;

	WAIT_4_SCB_CMD();
	WAIT_4_SCB_CMD_RUC();
	p->scb->rfa_offset = make16(p->rfd_first);
	p->scb->cmd_ruc = RUC_START;
	ni_attn586();		/* start cmd. */
	WAIT_4_SCB_CMD_RUC();	/* wait for accept cmd. (no timeout!!) */
}

/******************************************************
 * send frame
 */

static int ni52_send_packet(struct sk_buff *skb, struct device *dev)
{
	int len,i;
#ifndef NO_NOPCOMMANDS
	int next_nop;
#endif
	struct priv *p = (struct priv *) dev->priv;

	if(dev->tbusy)
	{
		int tickssofar = jiffies - dev->trans_start;
		if (tickssofar < 5)
			return 1;

#ifndef NO_NOPCOMMANDS
		if(p->scb->cus & CU_ACTIVE) /* COMMAND-UNIT active? */
		{
			dev->tbusy = 0;
#ifdef DEBUG
			printk("%s: strange ... timeout with CU active?!?\n",dev->name);
			printk("%s: X0: %04x N0: %04x N1: %04x %d\n",dev->name,(int)p->xmit_cmds[0]->cmd_status,(int)p->nop_cmds[0]->cmd_status,(int)p->nop_cmds[1]->cmd_status,(int)p->nop_point);
#endif
			p->scb->cmd_cuc = CUC_ABORT;
			ni_attn586();
			WAIT_4_SCB_CMD();
			p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
			p->scb->cmd_cuc = CUC_START;
			ni_attn586();
			WAIT_4_SCB_CMD();
			dev->trans_start = jiffies;
			return 0;
		}
		else
#endif
		{
#ifdef DEBUG
			printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus);
			printk("%s: command-stats: %04x %04x\n",dev->name,p->xmit_cmds[0]->cmd_status,p->xmit_cmds[1]->cmd_status);
			printk("%s: check, whether you set the right interrupt number!\n",dev->name);
#endif
			ni52_close(dev);
			ni52_open(dev);
		}
		dev->trans_start = jiffies;
		return 0;
	}

	if(skb->len > XMIT_BUFF_SIZE)
	{
		printk("%s: Sorry, max. framelength is %d bytes. The length of your frame is %d bytes.\n",dev->name,XMIT_BUFF_SIZE,skb->len);
		return 0;
	}

	if (test_and_set_bit(0, (void*)&dev->tbusy)) {
		printk("%s: Transmitter access conflict.\n", dev->name);
		return 1;
	}
#if(NUM_XMIT_BUFFS > 1)
	else if(test_and_set_bit(0,(void *) &p->lock)) {
		printk("%s: Queue was locked\n",dev->name);
		return 1;
	}
#endif
	else
	{
		memcpy((char *)p->xmit_cbuffs[p->xmit_count],(char *)(skb->data),skb->len);
		len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;

#if (NUM_XMIT_BUFFS == 1)
#	ifdef NO_NOPCOMMANDS

#ifdef DEBUG
		if(p->scb->cus & CU_ACTIVE)
		{
			printk("%s: Hmmm .. CU is still running and we wanna send a new packet.\n",dev->name);
			printk("%s: stat: %04x %04x\n",dev->name,p->scb->cus,p->xmit_cmds[0]->cmd_status);
		}
#endif

		p->xmit_buffs[0]->size = TBD_LAST | len;
		for(i=0;i<16;i++)
		{
			p->xmit_cmds[0]->cmd_status = 0;
			WAIT_4_SCB_CMD();
			if( (p->scb->cus & CU_STATUS) == CU_SUSPEND)
				p->scb->cmd_cuc = CUC_RESUME;
			else
			{
				p->scb->cbl_offset = make16(p->xmit_cmds[0]);
				p->scb->cmd_cuc = CUC_START;
			}

			ni_attn586();
			dev->trans_start = jiffies;
			if(!i)
				dev_kfree_skb(skb);
			WAIT_4_SCB_CMD();
			if( (p->scb->cus & CU_ACTIVE)) /* test it, because CU sometimes doesn't start immediately */
				break;
			if(p->xmit_cmds[0]->cmd_status)
				break;
			if(i==15)
				printk("%s: Can't start transmit-command.\n",dev->name);
		}
#	else
		next_nop = (p->nop_point + 1) & 0x1;
		p->xmit_buffs[0]->size = TBD_LAST | len;

		p->xmit_cmds[0]->cmd_link	 = p->nop_cmds[next_nop]->cmd_link
																= make16((p->nop_cmds[next_nop]));
		p->xmit_cmds[0]->cmd_status = p->nop_cmds[next_nop]->cmd_status = 0;

		p->nop_cmds[p->nop_point]->cmd_link = make16((p->xmit_cmds[0]));
		dev->trans_start = jiffies;
		p->nop_point = next_nop;
		dev_kfree_skb(skb);
#	endif
#else
		p->xmit_buffs[p->xmit_count]->size = TBD_LAST | len;
		if( (next_nop = p->xmit_count + 1) == NUM_XMIT_BUFFS )
			next_nop = 0;

		p->xmit_cmds[p->xmit_count]->cmd_status	= 0;
	/* linkpointer of xmit-command already points to next nop cmd */
		p->nop_cmds[next_nop]->cmd_link = make16((p->nop_cmds[next_nop]));
		p->nop_cmds[next_nop]->cmd_status = 0;

		p->nop_cmds[p->xmit_count]->cmd_link = make16((p->xmit_cmds[p->xmit_count]));
		dev->trans_start = jiffies;
		p->xmit_count = next_nop;

		{
			long flags;
			save_flags(flags);
			cli();
			if(p->xmit_count != p->xmit_last)
				dev->tbusy = 0;
			p->lock = 0;
			restore_flags(flags);
		}
		dev_kfree_skb(skb);
#endif
	}
	return 0;
}

/*******************************************
 * Someone wanna have the statistics
 */

static struct net_device_stats *ni52_get_stats(struct device *dev)
{
	struct priv *p = (struct priv *) dev->priv;
	unsigned short crc,aln,rsc,ovrn;

	crc = p->scb->crc_errs; /* get error-statistic from the ni82586 */
	p->scb->crc_errs = 0;
	aln = p->scb->aln_errs;
	p->scb->aln_errs = 0;
	rsc = p->scb->rsc_errs;
	p->scb->rsc_errs = 0;
	ovrn = p->scb->ovrn_errs;
	p->scb->ovrn_errs = 0;

	p->stats.rx_crc_errors += crc;
	p->stats.rx_fifo_errors += ovrn;
	p->stats.rx_frame_errors += aln;
	p->stats.rx_dropped += rsc;

	return &p->stats;
}

/********************************************************
 * Set MC list ..
 */
static void set_multicast_list(struct device *dev)
{
	if(!dev->start)
	{
		printk("%s: Can't apply promiscuous/multicastmode to a not running interface.\n",dev->name);
		return;
	}

	dev->start = 0;

	ni_disint();
	alloc586(dev);
	init586(dev);
	startrecv586(dev);
	ni_enaint();

	dev->start = 1;
}

#ifdef MODULE
static char devicename[9] = { 0, };
static struct device dev_ni52 = {
	devicename,	/* "ni5210": device name inserted by net_init.c */
	0, 0, 0, 0,
	0x300, 9,	 /* I/O address, IRQ */
	0, 0, 0, NULL, ni52_probe };

/* set: io,irq,memstart,memend or set it when calling insmod */
int irq=9;
int io=0x300;
long memstart=0; /* e.g 0xd0000 */
long memend=0;	 /* e.g 0xd4000 */

MODULE_PARM(io, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(memstart, "l");
MODULE_PARM(memend, "l");

int init_module(void)
{
	if(io <= 0x0 || !memend || !memstart || irq < 2) {
		printk("ni52: Autoprobing not allowed for modules.\nni52: Set symbols 'io' 'irq' 'memstart' and 'memend'\n");
		return -ENODEV;
	}
	dev_ni52.irq = irq;
	dev_ni52.base_addr = io;
	dev_ni52.mem_end = memend;
	dev_ni52.mem_start = memstart;
	if (register_netdev(&dev_ni52) != 0)
		return -EIO;
	return 0;
}

void cleanup_module(void)
{
	release_region(dev_ni52.base_addr, NI52_TOTAL_SIZE);
	unregister_netdev(&dev_ni52);
	kfree(dev_ni52.priv);
	dev_ni52.priv = NULL;
}
#endif /* MODULE */

#if 0
/*
 * DUMP .. we expect a not running CMD unit and enough space
 */
void ni52_dump(struct device *dev,void *ptr)
{
	struct priv *p = (struct priv *) dev->priv;
	struct dump_cmd_struct *dump_cmd = (struct dump_cmd_struct *) ptr;
	int i;

	p->scb->cmd_cuc = CUC_ABORT;
	ni_attn586();
	WAIT_4_SCB_CMD();
	WAIT_4_SCB_CMD_RUC();

	dump_cmd->cmd_status = 0;
	dump_cmd->cmd_cmd = CMD_DUMP | CMD_LAST;
	dump_cmd->dump_offset = make16((dump_cmd + 1));
	dump_cmd->cmd_link = 0xffff;

	p->scb->cbl_offset = make16(dump_cmd);
	p->scb->cmd_cuc = CUC_START;
	ni_attn586();
	WAIT_4_STAT_COMPL(dump_cmd);

	if( (dump_cmd->cmd_status & (STAT_COMPL|STAT_OK)) != (STAT_COMPL|STAT_OK) )
				printk("%s: Can't get dump information.\n",dev->name);

	for(i=0;i<170;i++) {
		printk("%02x ",(int) ((unsigned char *) (dump_cmd + 1))[i]);
		if(i % 24 == 23)
			printk("\n");
	}
	printk("\n");
}
#endif

/*
 * END: linux/drivers/net/ni52.c
 */