drivers/net/ethernet/dec/tulip/timer.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/dec/tulip/timer.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/dec/tulip/timer.c
Extension
.c
Size
4916 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source 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

if (tp->mtable == NULL) {	/* No EEPROM info, use generic code. */
			/* Not much that can be done.
			   Assume this a generic MII or SYM transceiver. */
			next_tick = 60*HZ;
			if (tulip_debug > 2)
				netdev_dbg(dev, "network media monitor CSR6 %08x CSR12 0x%02x\n",
					   ioread32(ioaddr + CSR6),
					   csr12 & 0xff);
			break;
		}
		mleaf = &tp->mtable->mleaf[tp->cur_index];
		p = mleaf->leafdata;
		switch (mleaf->type) {
		case 0: case 4: {
			/* Type 0 serial or 4 SYM transceiver.  Check the link beat bit. */
			int offset = mleaf->type == 4 ? 5 : 2;
			s8 bitnum = p[offset];
			if (p[offset+1] & 0x80) {
				if (tulip_debug > 1)
					netdev_dbg(dev, "Transceiver monitor tick CSR12=%#02x, no media sense\n",
						   csr12);
				if (mleaf->type == 4) {
					if (mleaf->media == 3 && (csr12 & 0x02))
						goto select_next_media;
				}
				break;
			}
			if (tulip_debug > 2)
				netdev_dbg(dev, "Transceiver monitor tick: CSR12=%#02x bit %d is %d, expecting %d\n",
					   csr12, (bitnum >> 1) & 7,
					   (csr12 & (1 << ((bitnum >> 1) & 7))) != 0,
					   (bitnum >= 0));
			/* Check that the specified bit has the proper value. */
			if ((bitnum < 0) !=
				((csr12 & (1 << ((bitnum >> 1) & 7))) != 0)) {
				if (tulip_debug > 2)
					netdev_dbg(dev, "Link beat detected for %s\n",
						   medianame[mleaf->media & MEDIA_MASK]);
				if ((p[2] & 0x61) == 0x01)	/* Bogus Znyx board. */
					goto actually_mii;
				netif_carrier_on(dev);
				break;
			}
			netif_carrier_off(dev);
			if (tp->medialock)
				break;
	  select_next_media:
			if (--tp->cur_index < 0) {
				/* We start again, but should instead look for default. */
				tp->cur_index = tp->mtable->leafcount - 1;
			}
			dev->if_port = tp->mtable->mleaf[tp->cur_index].media;
			if (tulip_media_cap[dev->if_port] & MediaIsFD)
				goto select_next_media; /* Skip FD entries. */
			if (tulip_debug > 1)
				netdev_dbg(dev, "No link beat on media %s, trying transceiver type %s\n",
					   medianame[mleaf->media & MEDIA_MASK],
					   medianame[tp->mtable->mleaf[tp->cur_index].media]);
			tulip_select_media(dev, 0);
			/* Restart the transmit process. */
			tulip_restart_rxtx(tp);
			next_tick = (24*HZ)/10;
			break;
		}
		case 1:  case 3:		/* 21140, 21142 MII */
		actually_mii:
			if (tulip_check_duplex(dev) < 0) {
				netif_carrier_off(dev);
				next_tick = 3*HZ;
			} else {
				netif_carrier_on(dev);
				next_tick = 60*HZ;
			}
			break;
		case 2:					/* 21142 serial block has no link beat. */
		default:
			break;
		}
	}
	break;
	}


	spin_lock_irqsave(&tp->lock, flags);
	if (tp->timeout_recovery) {
		tulip_tx_timeout_complete(tp, ioaddr);
		tp->timeout_recovery = 0;
	}
	spin_unlock_irqrestore(&tp->lock, flags);

Annotation

Implementation Notes