405gp_enet.c

U-Boot1.1.2是最为常用的嵌入式系统Bootloader

				serviced = 1;
				rc = 0;
			}
		}

		/* port by port dispatch of emac interrupts */

		if ((SEL_UIC_DEF(hw_p->devnum) & my_uicmsr) != 0) {	/* look for EMAC errors */
			emac_isr = in32 (EMAC_ISR + hw_p->hw_addr);
			if ((hw_p->emac_ier & emac_isr) != 0) {
				emac_err (dev, emac_isr);
				serviced = 1;
				rc = 0;
			}
		}
		if (((hw_p->emac_ier & emac_isr) != 0) || ((MAL_UIC_ERR & my_uicmsr) != 0)) {
			mtdcr (uicsr, MAL_UIC_DEF | SEL_UIC_DEF(hw_p->devnum)); /* Clear */
			return (rc);		/* we had errors so get out */
		}

		/* handle MAX TX EOB interrupt from a tx */
		if (my_uicmsr & UIC_MAL_TXEOB) {
			mal_rx_eob = mfdcr (maltxeobisr);
			mtdcr (maltxeobisr, mal_rx_eob);
			mtdcr (uicsr, UIC_MAL_TXEOB);
		}
		/* handle MAL RX EOB  interupt from a receive */
		/* check for EOB on valid channels	      */
		if (my_uicmsr & UIC_MAL_RXEOB)
		{
			mal_rx_eob = mfdcr (malrxeobisr);
			if ((mal_rx_eob & (0x80000000 >> hw_p->devnum)) != 0) {	/* call emac routine for channel x */
				/* clear EOB
				 mtdcr(malrxeobisr, mal_rx_eob); */
				enet_rcv (dev, emac_isr);
				/* indicate that we serviced an interrupt */
				serviced = 1;
				rc = 0;
			}
		}
		mtdcr (uicsr, MAL_UIC_DEF|EMAC_UIC_DEF|EMAC_UIC_DEF1);	/* Clear */
	}
	while (serviced);

	return (rc);
}
#endif
/*-----------------------------------------------------------------------------+
 *  MAL Error Routine
 *-----------------------------------------------------------------------------*/
static void mal_err (struct eth_device *dev, unsigned long isr,
		     unsigned long uic, unsigned long maldef,
		     unsigned long mal_errr)
{
	EMAC_405_HW_PST hw_p = dev->priv;

	mtdcr (malesr, isr);	/* clear interrupt */

	/* clear DE interrupt */
	mtdcr (maltxdeir, 0xC0000000);
	mtdcr (malrxdeir, 0x80000000);

#ifdef INFO_405_ENET
	printf ("\nMAL error occured.... ISR = %lx UIC = = %lx  MAL_DEF = %lx  MAL_ERR= %lx \n", isr, uic, maldef, mal_errr);
#endif

	eth_init (hw_p->bis);	/* start again... */
}

/*-----------------------------------------------------------------------------+
 *  EMAC Error Routine
 *-----------------------------------------------------------------------------*/
static void emac_err (struct eth_device *dev, unsigned long isr)
{
	EMAC_405_HW_PST hw_p = dev->priv;

	printf ("EMAC%d error occured.... ISR = %lx\n", hw_p->devnum, isr);
	out32 (EMAC_ISR + hw_p->hw_addr, isr);
}

/*-----------------------------------------------------------------------------+
 *  enet_rcv() handles the ethernet receive data
 *-----------------------------------------------------------------------------*/
static void enet_rcv (struct eth_device *dev, unsigned long malisr)
{
	struct enet_frame *ef_ptr;
	unsigned long data_len;
	unsigned long rx_eob_isr;
	EMAC_405_HW_PST hw_p = dev->priv;

	int handled = 0;
	int i;
	int loop_count = 0;

	rx_eob_isr = mfdcr (malrxeobisr);
	if ((0x80000000 >> hw_p->devnum) & rx_eob_isr) {
		/* clear EOB */
		mtdcr (malrxeobisr, rx_eob_isr);

		/* EMAC RX done */
		while (1) {	/* do all */
			i = hw_p->rx_slot;

			if ((MAL_RX_CTRL_EMPTY & hw_p->rx[i].ctrl)
			    || (loop_count >= NUM_RX_BUFF))
				break;
			loop_count++;
			hw_p->rx_slot++;
			if (NUM_RX_BUFF == hw_p->rx_slot)
				hw_p->rx_slot = 0;
			handled++;
			data_len = (unsigned long) hw_p->rx[i].data_len;	/* Get len */
			if (data_len) {
				if (data_len > ENET_MAX_MTU)	/* Check len */
					data_len = 0;
				else {
					if (EMAC_RX_ERRORS & hw_p->rx[i].ctrl) {	/* Check Errors */
						data_len = 0;
						hw_p->stats.rx_err_log[hw_p->
								       rx_err_index]
							= hw_p->rx[i].ctrl;
						hw_p->rx_err_index++;
						if (hw_p->rx_err_index ==
						    MAX_ERR_LOG)
							hw_p->rx_err_index =
								0;
					}	/* emac_erros */
				}	/* data_len < max mtu */
			}	/* if data_len */
			if (!data_len) {	/* no data */
				hw_p->rx[i].ctrl |= MAL_RX_CTRL_EMPTY;	/* Free Recv Buffer */

				hw_p->stats.data_len_err++;	/* Error at Rx */
			}

			/* !data_len */
			/* AS.HARNOIS */
			/* Check if user has already eaten buffer */
			/* if not => ERROR */
			else if (hw_p->rx_ready[hw_p->rx_i_index] != -1) {
				if (hw_p->is_receiving)
					printf ("ERROR : Receive buffers are full!\n");
				break;
			} else {
				hw_p->stats.rx_frames++;
				hw_p->stats.rx += data_len;
				ef_ptr = (struct enet_frame *) hw_p->rx[i].
					data_ptr;
#ifdef INFO_405_ENET
				hw_p->stats.pkts_rx++;
#endif
				/* AS.HARNOIS
				 * use ring buffer
				 */
				hw_p->rx_ready[hw_p->rx_i_index] = i;
				hw_p->rx_i_index++;
				if (NUM_RX_BUFF == hw_p->rx_i_index)
					hw_p->rx_i_index = 0;

				/* printf("X");  /|* test-only *|/ */

				/*  AS.HARNOIS
				 * free receive buffer only when
				 * buffer has been handled (eth_rx)
				 rx[i].ctrl |= MAL_RX_CTRL_EMPTY;
				 */
			}	/* if data_len */
		}		/* while */
	}			/* if EMACK_RXCHL */
}


static int ppc_4xx_eth_rx (struct eth_device *dev)
{
	int length;
	int user_index;
	unsigned long msr;
	EMAC_405_HW_PST hw_p = dev->priv;

	hw_p->is_receiving = 1;	/* tell driver */

	for (;;) {
		/* AS.HARNOIS
		 * use ring buffer and
		 * get index from rx buffer desciptor queue
		 */
		user_index = hw_p->rx_ready[hw_p->rx_u_index];
		if (user_index == -1) {
			length = -1;
			break;	/* nothing received - leave for() loop */
		}

		msr = mfmsr ();
		mtmsr (msr & ~(MSR_EE));

		length = hw_p->rx[user_index].data_len;

		/* Pass the packet up to the protocol layers. */
		/*       NetReceive(NetRxPackets[rxIdx], length - 4); */
		/*       NetReceive(NetRxPackets[i], length); */
		NetReceive (NetRxPackets[user_index], length - 4);
		/* Free Recv Buffer */
		hw_p->rx[user_index].ctrl |= MAL_RX_CTRL_EMPTY;
		/* Free rx buffer descriptor queue */
		hw_p->rx_ready[hw_p->rx_u_index] = -1;
		hw_p->rx_u_index++;
		if (NUM_RX_BUFF == hw_p->rx_u_index)
			hw_p->rx_u_index = 0;

#ifdef INFO_405_ENET
		hw_p->stats.pkts_handled++;
#endif

		mtmsr (msr);	/* Enable IRQ's */
	}

	hw_p->is_receiving = 0;	/* tell driver */

	return length;
}

static int virgin = 0;
int ppc_4xx_eth_initialize (bd_t * bis)
{
	struct eth_device *dev;
	int eth_num = 0;

	EMAC_405_HW_PST hw = NULL;

	for (eth_num = 0; eth_num < EMAC_NUM_DEV; eth_num++) {

		/* Allocate device structure */
		dev = (struct eth_device *) malloc (sizeof (*dev));
		if (dev == NULL) {
			printf ("ppc_405x_eth_initialize: "
				"Cannot allocate eth_device %d\n", eth_num);
			return (-1);
		}
		memset(dev, 0, sizeof(*dev));
		/* Allocate our private use data */
		hw = (EMAC_405_HW_PST) malloc (sizeof (*hw));
		if (hw == NULL) {
			printf ("ppc_405x_eth_initialize: "
				"Cannot allocate private hw data for eth_device %d",
				eth_num);
			free (dev);
			return (-1);
		}
		memset(hw, 0, sizeof(*hw));

		switch (eth_num) {
		case 0:
			hw->hw_addr = 0;
			memcpy (dev->enetaddr, bis->bi_enetaddr, 6);
			break;
#if defined(CONFIG_NET_MULTI)
		case 1:
			hw->hw_addr = 0x100;
			memcpy (dev->enetaddr, bis->bi_enet1addr, 6);
			break;
#endif
		default:
			hw->hw_addr = 0;
			memcpy (dev->enetaddr, bis->bi_enetaddr, 6);
			break;
		}

		hw->devnum = eth_num;
		hw->print_speed = 1;

		sprintf (dev->name, "ppc_405x_eth%d", eth_num);
		dev->priv = (void *) hw;
		dev->init = ppc_4xx_eth_init;
		dev->halt = ppc_4xx_eth_halt;
		dev->send = ppc_4xx_eth_send;
		dev->recv = ppc_4xx_eth_rx;

		if (0 == virgin) {
			/* set the MAL IER ??? names may change with new spec ??? */
			mal_ier =
				MAL_IER_DE | MAL_IER_NE | MAL_IER_TE |
				MAL_IER_OPBE | MAL_IER_PLBE;
			mtdcr (malesr, 0xffffffff);	/* clear pending interrupts */
			mtdcr (maltxdeir, 0xffffffff);	/* clear pending interrupts */
			mtdcr (malrxdeir, 0xffffffff);	/* clear pending interrupts */
			mtdcr (malier, mal_ier);

#if defined(CONFIG_405EP)
			/* 405EP has one EWU interrupt */
			irq_install_handler (VECNUM_EWU0,
					     (interrupt_handler_t *) enetInt,
					     dev);
#endif
			/* install MAL interrupt handler */
			irq_install_handler (VECNUM_MS,
					     (interrupt_handler_t *) enetInt,
					     dev);
			irq_install_handler (VECNUM_MTE,
					     (interrupt_handler_t *) enetInt,
					     dev);
			irq_install_handler (VECNUM_MRE,
					     (interrupt_handler_t *) enetInt,
					     dev);
			irq_install_handler (VECNUM_TXDE,
					     (interrupt_handler_t *) enetInt,
					     dev);
			irq_install_handler (VECNUM_RXDE,
					     (interrupt_handler_t *) enetInt,
					     dev);
			virgin = 1;
		}

#if defined(CONFIG_NET_MULTI)
		eth_register (dev);
#else
		emac0_dev = dev;
#endif

	}			/* end for each supported device */

	return (1);
}

#if !defined(CONFIG_NET_MULTI)
void eth_halt (void) {
	if (emac0_dev) {
		ppc_4xx_eth_halt(emac0_dev);
		free(emac0_dev);
		emac0_dev = NULL;
	}
}

int eth_init (bd_t *bis)
{
	ppc_4xx_eth_initialize(bis);
	return(ppc_4xx_eth_init(emac0_dev, bis));
}

int eth_send(volatile void *packet, int length)
{

	return (ppc_4xx_eth_send(emac0_dev, packet, length));
}

int eth_rx(void)
{
	return (ppc_4xx_eth_rx(emac0_dev));
}
#endif

#endif /* CONFIG_405 */