drivers/net/ethernet/natsemi/macsonic.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/natsemi/macsonic.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/natsemi/macsonic.c
Extension
.c
Size
17666 bytes
Lines
650
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct net_device_ops macsonic_netdev_ops = {
	.ndo_open		= macsonic_open,
	.ndo_stop		= macsonic_close,
	.ndo_start_xmit		= sonic_send_packet,
	.ndo_set_rx_mode	= sonic_multicast_list,
	.ndo_tx_timeout		= sonic_tx_timeout,
	.ndo_get_stats		= sonic_get_stats,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
};

static int macsonic_init(struct net_device *dev)
{
	struct sonic_local* lp = netdev_priv(dev);
	int err = sonic_alloc_descriptors(dev);

	if (err)
		return err;

	dev->netdev_ops = &macsonic_netdev_ops;
	dev->watchdog_timeo = TX_TIMEOUT;

	/*
	 * clear tally counter
	 */
	SONIC_WRITE(SONIC_CRCT, 0xffff);
	SONIC_WRITE(SONIC_FAET, 0xffff);
	SONIC_WRITE(SONIC_MPT, 0xffff);

	return 0;
}

#define INVALID_MAC(mac) (memcmp(mac, "\x08\x00\x07", 3) && \
                          memcmp(mac, "\x00\xA0\x40", 3) && \
                          memcmp(mac, "\x00\x80\x19", 3) && \
                          memcmp(mac, "\x00\x05\x02", 3))

static void mac_onboard_sonic_ethernet_addr(struct net_device *dev)
{
	struct sonic_local *lp = netdev_priv(dev);
	const int prom_addr = ONBOARD_SONIC_PROM_BASE;
	unsigned short val;
	u8 addr[ETH_ALEN];

	/*
	 * On NuBus boards we can sometimes look in the ROM resources.
	 * No such luck for comm-slot/onboard.
	 * On the PowerBook 520, the PROM base address is a mystery.
	 */
	if (hwreg_present((void *)prom_addr)) {
		int i;

		for (i = 0; i < 6; i++)
			addr[i] = SONIC_READ_PROM(i);
		eth_hw_addr_set(dev, addr);
		if (!INVALID_MAC(dev->dev_addr))
			return;

		/*
		 * Most of the time, the address is bit-reversed. The NetBSD
		 * source has a rather long and detailed historical account of
		 * why this is so.
		 */
		bit_reverse_addr(addr);
		eth_hw_addr_set(dev, addr);
		if (!INVALID_MAC(dev->dev_addr))
			return;

		/*
		 * If we still have what seems to be a bogus address, we'll
		 * look in the CAM. The top entry should be ours.
		 */
		printk(KERN_WARNING "macsonic: MAC address in PROM seems "
		                    "to be invalid, trying CAM\n");
	} else {
		printk(KERN_WARNING "macsonic: cannot read MAC address from "
		                    "PROM, trying CAM\n");
	}

	/* This only works if MacOS has already initialized the card. */

	SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
	SONIC_WRITE(SONIC_CEP, 15);

	val = SONIC_READ(SONIC_CAP2);
	addr[5] = val >> 8;
	addr[4] = val & 0xff;
	val = SONIC_READ(SONIC_CAP1);
	addr[3] = val >> 8;
	addr[2] = val & 0xff;

Annotation

Implementation Notes