drivers/net/wan/hd64570.c

Source file repositories/reference/linux-study-clean/drivers/net/wan/hd64570.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wan/hd64570.c
Extension
.c
Size
19914 bytes
Lines
725
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 (!transmit) { /* Receive */
			/* set buffer length */
			sca_outw(HDLC_MAX_MRU, dmac + BFLL, card);
			/* Chain mode, Multi-frame */
			sca_out(0x14, DMR_RX(phy_node(port)), card);
			sca_out(DIR_EOME | DIR_BOFE, DIR_RX(phy_node(port)),
				card);
			/* DMA enable */
			sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
		} else {	/* Transmit */
			/* Chain mode, Multi-frame */
			sca_out(0x14, DMR_TX(phy_node(port)), card);
			/* enable underflow interrupts */
			sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
		}
	}
	sca_set_carrier(port);
}

#ifdef NEED_SCA_MSCI_INTR
/* MSCI interrupt service */
static inline void sca_msci_intr(port_t *port)
{
	u16 msci = get_msci(port);
	card_t *card = port_to_card(port);
	u8 stat = sca_in(msci + ST1, card); /* read MSCI ST1 status */

	/* Reset MSCI TX underrun and CDCD status bit */
	sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);

	if (stat & ST1_UDRN) {
		/* TX Underrun error detected */
		port_to_dev(port)->stats.tx_errors++;
		port_to_dev(port)->stats.tx_fifo_errors++;
	}

	if (stat & ST1_CDCD)
		sca_set_carrier(port);
}
#endif

static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc,
			  u16 rxin)
{
	struct net_device *dev = port_to_dev(port);
	struct sk_buff *skb;
	u16 len;
	u32 buff;
	u32 maxlen;
	u8 page;

	len = readw(&desc->len);
	skb = dev_alloc_skb(len);
	if (!skb) {
		dev->stats.rx_dropped++;
		return;
	}

	buff = buffer_offset(port, rxin, 0);
	page = buff / winsize(card);
	buff = buff % winsize(card);
	maxlen = winsize(card) - buff;

	openwin(card, page);

	if (len > maxlen) {
		memcpy_fromio(skb->data, winbase(card) + buff, maxlen);
		openwin(card, page + 1);
		memcpy_fromio(skb->data + maxlen, winbase(card), len - maxlen);
	} else {
		memcpy_fromio(skb->data, winbase(card) + buff, len);
	}

#ifndef PAGE0_ALWAYS_MAPPED
	openwin(card, 0);	/* select pkt_desc table page back */
#endif
	skb_put(skb, len);
#ifdef DEBUG_PKT
	printk(KERN_DEBUG "%s RX(%i):", dev->name, skb->len);
	debug_frame(skb);
#endif
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += skb->len;
	skb->protocol = hdlc_type_trans(skb, dev);
	netif_rx(skb);
}

/* Receive DMA interrupt service */
static inline void sca_rx_intr(port_t *port)
{

Annotation

Implementation Notes