e1000.c

	txp = tx_base + tx_tail;
	tx_tail = (tx_tail + 1) % 8;

	txp->buffer_addr = cpu_to_le64(virt_to_bus(hw->pdev, nv_packet));
	txp->lower.data = cpu_to_le32(hw->txd_cmd | length);
	txp->upper.data = 0;
	E1000_WRITE_REG(hw, TDT, tx_tail);

	E1000_WRITE_FLUSH(hw);
	while (!(le32_to_cpu(txp->upper.data) & E1000_TXD_STAT_DD)) {
		if (i++ > TOUT_LOOP) {
			DEBUGOUT("e1000: tx timeout\n");
			return 0;
		}
		udelay(10);	/* give the nic a chance to write to the register */
	}
	return 1;
}

/*reset function*/
static inline int
e1000_reset(struct eth_device *nic)
{
	struct e1000_hw *hw = nic->priv;

	e1000_reset_hw(hw);
	if (hw->mac_type >= e1000_82544) {
		E1000_WRITE_REG(hw, WUC, 0);
	}
	return e1000_init_hw(nic);
}

/**************************************************************************
DISABLE - Turn off ethernet interface
***************************************************************************/
static void
e1000_disable(struct eth_device *nic)
{
	struct e1000_hw *hw = nic->priv;

	/* Turn off the ethernet interface */
	E1000_WRITE_REG(hw, RCTL, 0);
	E1000_WRITE_REG(hw, TCTL, 0);

	/* Clear the transmit ring */
	E1000_WRITE_REG(hw, TDH, 0);
	E1000_WRITE_REG(hw, TDT, 0);

	/* Clear the receive ring */
	E1000_WRITE_REG(hw, RDH, 0);
	E1000_WRITE_REG(hw, RDT, 0);

	/* put the card in its initial state */
#if 0
	E1000_WRITE_REG(hw, CTRL, E1000_CTRL_RST);
#endif
	mdelay(10);

}

/**************************************************************************
INIT - set up ethernet interface(s)
***************************************************************************/
static int
e1000_init(struct eth_device *nic, bd_t * bis)
{
	struct e1000_hw *hw = nic->priv;
	int ret_val = 0;

	ret_val = e1000_reset(nic);
	if (ret_val < 0) {
		if ((ret_val == -E1000_ERR_NOLINK) ||
		    (ret_val == -E1000_ERR_TIMEOUT)) {
			E1000_ERR(hw->nic, "Valid Link not detected\n");
		} else {
			E1000_ERR(hw->nic, "Hardware Initialization Failed\n");
		}
		return 0;
	}
	e1000_configure_tx(hw);
	e1000_setup_rctl(hw);
	e1000_configure_rx(hw);
	return 1;
}

/******************************************************************************
 * Gets the current PCI bus type of hardware
 *
 * hw - Struct containing variables accessed by shared code
 *****************************************************************************/
void e1000_get_bus_type(struct e1000_hw *hw)
{
	uint32_t status;

	switch (hw->mac_type) {
	case e1000_82542_rev2_0:
	case e1000_82542_rev2_1:
		hw->bus_type = e1000_bus_type_pci;
		break;
	case e1000_82571:
	case e1000_82572:
	case e1000_82573:
	case e1000_82574:
	case e1000_80003es2lan:
		hw->bus_type = e1000_bus_type_pci_express;
		break;
	case e1000_ich8lan:
		hw->bus_type = e1000_bus_type_pci_express;
		break;
	default:
		status = E1000_READ_REG(hw, STATUS);
		hw->bus_type = (status & E1000_STATUS_PCIX_MODE) ?
				e1000_bus_type_pcix : e1000_bus_type_pci;
		break;
	}
}

/* A list of all registered e1000 devices */
static LIST_HEAD(e1000_hw_list);

/**************************************************************************
PROBE - Look for an adapter, this routine's visible to the outside
You should omit the last argument struct pci_device * for a non-PCI NIC
***************************************************************************/
int
e1000_initialize(bd_t * bis)
{
	unsigned int i;
	pci_dev_t devno;

	DEBUGFUNC();

	/* Find and probe all the matching PCI devices */
	for (i = 0; (devno = pci_find_devices(e1000_supported, i)) >= 0; i++) {
		u32 val;

		/*
		 * These will never get freed due to errors, this allows us to
		 * perform SPI EEPROM programming from U-boot, for example.
		 */
		struct eth_device *nic = malloc(sizeof(*nic));
		struct e1000_hw *hw = malloc(sizeof(*hw));
		if (!nic || !hw) {
			printf("e1000#%u: Out of Memory!\n", i);
			free(nic);
			free(hw);
			continue;
		}

		/* Make sure all of the fields are initially zeroed */
		memset(nic, 0, sizeof(*nic));
		memset(hw, 0, sizeof(*hw));

		/* Assign the passed-in values */
		hw->cardnum = i;
		hw->pdev = devno;
		hw->nic = nic;
		nic->priv = hw;

		/* Generate a card name */
		sprintf(nic->name, "e1000#%u", hw->cardnum);

		/* Print a debug message with the IO base address */
		pci_read_config_dword(devno, PCI_BASE_ADDRESS_0, &val);
		E1000_DBG(nic, "iobase 0x%08x\n", val & 0xfffffff0);

		/* Try to enable I/O accesses and bus-mastering */
		val = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
		pci_write_config_dword(devno, PCI_COMMAND, val);

		/* Make sure it worked */
		pci_read_config_dword(devno, PCI_COMMAND, &val);
		if (!(val & PCI_COMMAND_MEMORY)) {
			E1000_ERR(nic, "Can't enable I/O memory\n");
			continue;
		}
		if (!(val & PCI_COMMAND_MASTER)) {
			E1000_ERR(nic, "Can't enable bus-mastering\n");
			continue;
		}

		/* Are these variables needed? */
		hw->fc = e1000_fc_default;
		hw->original_fc = e1000_fc_default;
		hw->autoneg_failed = 0;
		hw->autoneg = 1;
		hw->get_link_status = TRUE;
		hw->hw_addr = pci_map_bar(devno,	PCI_BASE_ADDRESS_0,
							PCI_REGION_MEM);
		hw->mac_type = e1000_undefined;

		/* MAC and Phy settings */
		if (e1000_sw_init(nic) < 0) {
			E1000_ERR(nic, "Software init failed\n");
			continue;
		}
		if (e1000_check_phy_reset_block(hw))
			E1000_ERR(nic, "PHY Reset is blocked!\n");

		/* Basic init was OK, reset the hardware and allow SPI access */
		e1000_reset_hw(hw);
		list_add_tail(&hw->list_node, &e1000_hw_list);

		/* Validate the EEPROM and get chipset information */
#if !defined(CONFIG_MVBC_1G)
		if (e1000_init_eeprom_params(hw)) {
			E1000_ERR(nic, "EEPROM is invalid!\n");
			continue;
		}
		if (e1000_validate_eeprom_checksum(hw))
			continue;
#endif
		e1000_read_mac_addr(nic);
		e1000_get_bus_type(hw);

		printf("e1000: %02x:%02x:%02x:%02x:%02x:%02x\n       ",
		       nic->enetaddr[0], nic->enetaddr[1], nic->enetaddr[2],
		       nic->enetaddr[3], nic->enetaddr[4], nic->enetaddr[5]);

		/* Set up the function pointers and register the device */
		nic->init = e1000_init;
		nic->recv = e1000_poll;
		nic->send = e1000_transmit;
		nic->halt = e1000_disable;
		eth_register(nic);
	}

	return i;
}

struct e1000_hw *e1000_find_card(unsigned int cardnum)
{
	struct e1000_hw *hw;

	list_for_each_entry(hw, &e1000_hw_list, list_node)
		if (hw->cardnum == cardnum)
			return hw;

	return NULL;
}

#ifdef CONFIG_CMD_E1000
static int do_e1000(cmd_tbl_t *cmdtp, int flag,
		int argc, char * const argv[])
{
	struct e1000_hw *hw;

	if (argc < 3) {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Make sure we can find the requested e1000 card */
	hw = e1000_find_card(simple_strtoul(argv[1], NULL, 10));
	if (!hw) {
		printf("e1000: ERROR: No such device: e1000#%s\n", argv[1]);
		return 1;
	}

	if (!strcmp(argv[2], "print-mac-address")) {
		unsigned char *mac = hw->nic->enetaddr;
		printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
			mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
		return 0;
	}

#ifdef CONFIG_E1000_SPI
	/* Handle the "SPI" subcommand */
	if (!strcmp(argv[2], "spi"))
		return do_e1000_spi(cmdtp, hw, argc - 3, argv + 3);
#endif

	cmd_usage(cmdtp);
	return 1;
}

U_BOOT_CMD(
	e1000, 7, 0, do_e1000,
	"Intel e1000 controller management",
	/*  */"<card#> print-mac-address\n"
#ifdef CONFIG_E1000_SPI
	"e1000 <card#> spi show [<offset> [<length>]]\n"
	"e1000 <card#> spi dump <addr> <offset> <length>\n"
	"e1000 <card#> spi program <addr> <offset> <length>\n"
	"e1000 <card#> spi checksum [update]\n"
#endif
	"       - Manage the Intel E1000 PCI device"
);
#endif /* not CONFIG_CMD_E1000 */