405gp_enet.c

U-Boot1.1.2是最为常用的嵌入式系统Bootloader

	hw_p->alloc_rx_buf =
		(mal_desc_t *) malloc ((sizeof (mal_desc_t) * NUM_RX_BUFF) +
				       ((2 * CFG_CACHELINE_SIZE) - 2));
	if (((int) hw_p->alloc_rx_buf & CACHELINE_MASK) != 0) {
		hw_p->rx =
			(mal_desc_t *) ((int) hw_p->alloc_rx_buf +
					CFG_CACHELINE_SIZE -
					((int) hw_p->
					 alloc_rx_buf & CACHELINE_MASK));
	} else {
		hw_p->rx = hw_p->alloc_rx_buf;
	}

	for (i = 0; i < NUM_TX_BUFF; i++) {
		hw_p->tx[i].ctrl = 0;
		hw_p->tx[i].data_len = 0;
		if (hw_p->first_init == 0)
			hw_p->txbuf_ptr =
				(char *) malloc (ENET_MAX_MTU_ALIGNED);
		hw_p->tx[i].data_ptr = hw_p->txbuf_ptr;
		if ((NUM_TX_BUFF - 1) == i)
			hw_p->tx[i].ctrl |= MAL_TX_CTRL_WRAP;
		hw_p->tx_run[i] = -1;
#if 0
		printf ("TX_BUFF %d @ 0x%08lx\n", i,
			(ulong) hw_p->tx[i].data_ptr);
#endif
	}

	for (i = 0; i < NUM_RX_BUFF; i++) {
		hw_p->rx[i].ctrl = 0;
		hw_p->rx[i].data_len = 0;
		/*       rx[i].data_ptr = (char *) &rx_buff[i]; */
		hw_p->rx[i].data_ptr = (char *) NetRxPackets[i];
		if ((NUM_RX_BUFF - 1) == i)
			hw_p->rx[i].ctrl |= MAL_RX_CTRL_WRAP;
		hw_p->rx[i].ctrl |= MAL_RX_CTRL_EMPTY | MAL_RX_CTRL_INTR;
		hw_p->rx_ready[i] = -1;
#if 0
		printf ("RX_BUFF %d @ 0x%08lx\n", i, (ulong) rx[i].data_ptr);
#endif
	}

	reg = 0x00000000;
	reg |= dev->enetaddr[0];	/* set high address */
	reg = reg << 8;
	reg |= dev->enetaddr[1];

	out32 (EMAC_IAH + hw_p->hw_addr, reg);

	reg = 0x00000000;
	reg |= dev->enetaddr[2];	/* set low address  */
	reg = reg << 8;
	reg |= dev->enetaddr[3];
	reg = reg << 8;
	reg |= dev->enetaddr[4];
	reg = reg << 8;
	reg |= dev->enetaddr[5];

	out32 (EMAC_IAL + hw_p->hw_addr, reg);
	switch (devnum) {
#if defined(CONFIG_NET_MULTI)
	case 1:
		/* setup MAL tx & rx channel pointers */
		/* For 405EP, the EMAC1 tx channel 0 is MAL tx channel 2 */
		mtdcr (maltxctp2r, hw_p->tx);
		mtdcr (malrxctp1r, hw_p->rx);
		/* set RX buffer size */
		mtdcr (malrcbs1, ENET_MAX_MTU_ALIGNED / 16);
		break;
#endif
	case 0:
	default:
		/* setup MAL tx & rx channel pointers */
		mtdcr (maltxctp0r, hw_p->tx);
		mtdcr (malrxctp0r, hw_p->rx);
		/* set RX buffer size */
		mtdcr (malrcbs0, ENET_MAX_MTU_ALIGNED / 16);
		break;
	}

	/* Enable MAL transmit and receive channels */
	mtdcr (maltxcasr, (MAL_TXRX_CASR >> (hw_p->devnum * 2)));
	mtdcr (malrxcasr, (MAL_TXRX_CASR >> hw_p->devnum));

	/* set transmit enable & receive enable */
	out32 (EMAC_M0 + hw_p->hw_addr, EMAC_M0_TXE | EMAC_M0_RXE);

	/* set receive fifo to 4k and tx fifo to 2k */
	mode_reg = in32 (EMAC_M1 + hw_p->hw_addr);
	mode_reg |= EMAC_M1_RFS_4K | EMAC_M1_TX_FIFO_2K;

	/* set speed */
	if (speed == _100BASET)
		mode_reg = mode_reg | EMAC_M1_MF_100MBPS | EMAC_M1_IST;
	else
		mode_reg = mode_reg & ~0x00C00000;	/* 10 MBPS */
	if (duplex == FULL)
		mode_reg = mode_reg | 0x80000000 | EMAC_M1_IST;

	out32 (EMAC_M1 + hw_p->hw_addr, mode_reg);

#if defined(CONFIG_440)
	/* set speed in the ZMII bridge */
	if (speed == _100BASET)
		out32(ZMII_SSR, in32(ZMII_SSR) | 0x10000000);
	else
		out32(ZMII_SSR, in32(ZMII_SSR) & ~0x10000000);
#endif

	/* Enable broadcast and indvidual address */
	/* TBS: enabling runts as some misbehaved nics will send runts */
	out32 (EMAC_RXM + hw_p->hw_addr, EMAC_RMR_BAE | EMAC_RMR_IAE);

	/* we probably need to set the tx mode1 reg? maybe at tx time */

	/* set transmit request threshold register */
	out32 (EMAC_TRTR + hw_p->hw_addr, 0x18000000);	/* 256 byte threshold */

#if defined(CONFIG_440)
	/* 440GP has a 64 byte burst length */
	out32 (EMAC_RX_HI_LO_WMARK + hw_p->hw_addr, 0x0f002000);
	out32 (EMAC_TXM1 + hw_p->hw_addr, 0xf8640000);
#else
	/* 405s have a 16 byte burst length */
	out32 (EMAC_RX_HI_LO_WMARK + hw_p->hw_addr, 0x0f002000);
#endif


	/* Frame gap set */
	out32 (EMAC_I_FRAME_GAP_REG + hw_p->hw_addr, 0x00000008);

	/* Set EMAC IER */
	hw_p->emac_ier = EMAC_ISR_PTLE | EMAC_ISR_BFCS |
		EMAC_ISR_ORE | EMAC_ISR_IRE;
	if (speed == _100BASET)
		hw_p->emac_ier = hw_p->emac_ier | EMAC_ISR_SYE;

	out32 (EMAC_ISR + hw_p->hw_addr, 0xffffffff);	/* clear pending interrupts */
	out32 (EMAC_IER + hw_p->hw_addr, hw_p->emac_ier);

	if (hw_p->first_init == 0) {
		/*
		 * Connect interrupt service routines
		 */
#if !defined(CONFIG_405EP)
		/* 405EP has one EWU interrupt */
		irq_install_handler (VECNUM_EWU0 + (hw_p->devnum * 2),
				     (interrupt_handler_t *) enetInt, dev);
#endif
		irq_install_handler (VECNUM_ETH0 + (hw_p->devnum * 2),
				     (interrupt_handler_t *) enetInt, dev);
	}

	mtmsr (msr);		/* enable interrupts again */

	hw_p->bis = bis;
	hw_p->first_init = 1;

	return (1);
}


static int ppc_4xx_eth_send (struct eth_device *dev, volatile void *ptr, int len)
{
	struct enet_frame *ef_ptr;
	ulong time_start, time_now;
	unsigned long temp_txm0;
	EMAC_405_HW_PST hw_p = dev->priv;

	ef_ptr = (struct enet_frame *) ptr;

	/*-----------------------------------------------------------------------+
	 *  Copy in our address into the frame.
	 *-----------------------------------------------------------------------*/
	(void) memcpy (ef_ptr->source_addr, dev->enetaddr, ENET_ADDR_LENGTH);

	/*-----------------------------------------------------------------------+
	 * If frame is too long or too short, modify length.
	 *-----------------------------------------------------------------------*/
	/* TBS: where does the fragment go???? */
	if (len > ENET_MAX_MTU)
		len = ENET_MAX_MTU;

	/*   memcpy ((void *) &tx_buff[tx_slot], (const void *) ptr, len); */
	memcpy ((void *) hw_p->txbuf_ptr, (const void *) ptr, len);

	/*-----------------------------------------------------------------------+
	 * set TX Buffer busy, and send it
	 *-----------------------------------------------------------------------*/
	hw_p->tx[hw_p->tx_slot].ctrl = (MAL_TX_CTRL_LAST |
					EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP) &
		~(EMAC_TX_CTRL_ISA | EMAC_TX_CTRL_RSA);
	if ((NUM_TX_BUFF - 1) == hw_p->tx_slot)
		hw_p->tx[hw_p->tx_slot].ctrl |= MAL_TX_CTRL_WRAP;

	hw_p->tx[hw_p->tx_slot].data_len = (short) len;
	hw_p->tx[hw_p->tx_slot].ctrl |= MAL_TX_CTRL_READY;

	__asm__ volatile ("eieio");

	out32 (EMAC_TXM0 + hw_p->hw_addr,
	       in32 (EMAC_TXM0 + hw_p->hw_addr) | EMAC_TXM0_GNP0);
#ifdef INFO_405_ENET
	hw_p->stats.pkts_tx++;
#endif

	/*-----------------------------------------------------------------------+
	 * poll unitl the packet is sent and then make sure it is OK
	 *-----------------------------------------------------------------------*/
	time_start = get_timer (0);
	while (1) {
		temp_txm0 = in32 (EMAC_TXM0 + hw_p->hw_addr);
		/* loop until either TINT turns on or 3 seconds elapse */
		if ((temp_txm0 & EMAC_TXM0_GNP0) != 0) {
			/* transmit is done, so now check for errors
			 * If there is an error, an interrupt should
			 * happen when we return
			 */
			time_now = get_timer (0);
			if ((time_now - time_start) > 3000) {
				return (-1);
			}
		} else {
			return (len);
		}
	}
}

#if defined(CONFIG_440)
int enetInt (struct eth_device *dev)
{
	int serviced;
	int rc = -1;				/* default to not us */
	unsigned long mal_isr;
	unsigned long emac_isr = 0;
	unsigned long mal_rx_eob;
	unsigned long my_uic0msr, my_uic1msr;
	EMAC_405_HW_PST hw_p;

	/*
	 * Because the mal is generic, we need to get the current
	 * eth device
	 */
#if defined(CONFIG_NET_MULTI)
	dev = eth_get_dev();
#else
	dev = emac0_dev;
#endif
	hw_p = dev->priv;

	/* enter loop that stays in interrupt code until nothing to service */
	do {
		serviced = 0;

		my_uic0msr = mfdcr (uic0msr);
		my_uic1msr = mfdcr (uic1msr);

		if (!(my_uic0msr & UIC_MRE)
		    && !(my_uic1msr & (UIC_ETH0 | UIC_MS | UIC_MTDE | UIC_MRDE))) {
			/* not for us */
			return (rc);
		}

		/* get and clear controller status interrupts */
		/* look at Mal and EMAC interrupts */
		if ((my_uic0msr & UIC_MRE)
		    || (my_uic1msr & (UIC_MS | UIC_MTDE | UIC_MRDE))) {
			/* we have a MAL interrupt */
			mal_isr = mfdcr (malesr);
			/* look for mal error */
			if (my_uic1msr & (UIC_MS | UIC_MTDE | UIC_MRDE)) {
				mal_err (dev, mal_isr, my_uic0msr, MAL_UIC_DEF, MAL_UIC_ERR);
				serviced = 1;
				rc = 0;
			}
		}
		if (UIC_ETH0 & my_uic1msr) {	/* 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)
		    || (my_uic1msr & (UIC_MS | UIC_MTDE | UIC_MRDE))) {
			mtdcr (uic0sr, UIC_MRE); /* Clear */
			mtdcr (uic1sr, UIC_ETH0 | UIC_MS | UIC_MTDE | UIC_MRDE); /* Clear */
			return (rc);		/* we had errors so get out */
		}

		/* handle MAL RX EOB  interupt from a receive */
		/* check for EOB on valid channels            */
		if (my_uic0msr & UIC_MRE) {
			mal_rx_eob = mfdcr (malrxeobisr);
			if ((mal_rx_eob & (0x80000000 >> hw_p->devnum)) != 0) {	/* call emac routine for channel 0 */
				/* clear EOB
				   mtdcr(malrxeobisr, mal_rx_eob); */
				enet_rcv (dev, emac_isr);
				/* indicate that we serviced an interrupt */
				serviced = 1;
				rc = 0;
			}
		}
		mtdcr (uic0sr, UIC_MRE); /* Clear */
		mtdcr (uic1sr, UIC_ETH0 | UIC_MS | UIC_MTDE | UIC_MRDE); /* Clear */
	} while (serviced);

	return (rc);
}

#else /* CONFIG_440 */

int enetInt (struct eth_device *dev)
{
	int serviced;
	int rc = -1;		/* default to not us */
	unsigned long mal_isr;
	unsigned long emac_isr = 0;
	unsigned long mal_rx_eob;
	unsigned long my_uicmsr;

	EMAC_405_HW_PST hw_p;

	/*
	 * Because the mal is generic, we need to get the current
	 * eth device
	 */
#if defined(CONFIG_NET_MULTI)
	dev = eth_get_dev();
#else
	dev = emac0_dev;
#endif

	hw_p = dev->priv;

	/* enter loop that stays in interrupt code until nothing to service */
	do {
		serviced = 0;

		my_uicmsr = mfdcr (uicmsr);

		if ((my_uicmsr & (MAL_UIC_DEF | EMAC_UIC_DEF)) == 0) {	/* not for us */
			return (rc);
		}
		/* get and clear controller status interrupts */
		/* look at Mal and EMAC interrupts */
		if ((MAL_UIC_DEF & my_uicmsr) != 0) {	/* we have a MAL interrupt */
			mal_isr = mfdcr (malesr);
			/* look for mal error */
			if ((my_uicmsr & MAL_UIC_ERR) != 0) {
				mal_err (dev, mal_isr, my_uicmsr, MAL_UIC_DEF, MAL_UIC_ERR);