/*
* This file is derived from sys/arch/i386/stand/lib/netif/dp8390.c
* NetBSD: dp8390.c,v 1.6 2008/12/14 18:46:33 christos Exp
*/
/*
* Polling driver for National Semiconductor DS8390/WD83C690 based
* ethernet adapters.
*
* Copyright (c) 1998 Matthias Drochner. All rights reserved.
*
* Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved.
*
* Copyright (C) 1993, David Greenman. This software may be used, modified,
* copied, distributed, and sold, in both source and binary form provided that
* the above copyright and these terms are retained. Under no circumstances is
* the author responsible for the proper functioning of this software, nor does
* the author assume any responsibility for damages incurred with its use.
*/
/*
* Initialize the NIC in the exact order outlined in the NS manual.
* This init procedure is "mandatory"...don't change what or when
* things happen.
*/
/* Set interface for page 0, remote DMA complete, stopped. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_STP);
if ((dp8390_dcr_reg & ED_DCR_LS)) {
NIC_PUT(ED_P0_DCR, dp8390_dcr_reg);
} else {
/*
* Set FIFO threshold to 8, No auto-init Remote DMA, byte
* order=80x86, byte-wide DMA xfers,
*/
NIC_PUT(ED_P0_DCR, ED_DCR_FT1 | ED_DCR_LS);
}
/*
* Clear all interrupts. A '1' in each bit position clears the
* corresponding flag.
*/
NIC_PUT(ED_P0_ISR, 0xff);
/*
* Disable all interrupts.
*/
NIC_PUT(ED_P0_IMR, 0);
/* Program command register for page 1. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_1 | ED_CR_STP);
/* Copy out our station address. */
for (i = 0; i < 6; i++)
NIC_PUT(ED_P1_PAR0 + i, eth_myaddr[i]);
/*
* Set current page pointer to one page after the boundary pointer, as
* recommended in the National manual.
*/
next_packet = rec_page_start + 1;
NIC_PUT(ED_P1_CURR, next_packet);
/* Program command register for page 0. */
NIC_PUT(ED_P1_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_STP);
/* directed and broadcast */
NIC_PUT(ED_P0_RCR, ED_RCR_AB);
/* Take interface out of loopback. */
NIC_PUT(ED_P0_TCR, 0);
/* Fire up the interface. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_STA);
}
/* Stop everything on the interface, and select page 0 registers. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_STP);
/*
* Wait for interface to enter stopped state, but limit # of checks to
* 'n' (about 5ms). It shouldn't even take 5us on modern DS8390's, but
* just in case it's an old one.
*/
while (((NIC_GET(ED_P0_ISR) & ED_ISR_RST) == 0) && --n)
continue;
}
int
EtherSend(char *pkt, int len)
{
ne2000_writemem(pkt, dp8390_membase, len);
/* Set TX buffer start page. */
NIC_PUT(ED_P0_TPSR, TX_PAGE_START);
/* Set TX length. */
NIC_PUT(ED_P0_TBCR0, len < 60 ? 60 : len);
NIC_PUT(ED_P0_TBCR1, len >> 8);
/* Set page 0, remote DMA complete, transmit packet, and *start*. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_TXP | ED_CR_STA);
/* Does copy wrap to lower addr in ring buffer? */
if (buf + len > dp8390_membase + dp8390_memsize) {
tmp_amount = dp8390_membase + dp8390_memsize - buf;
/* Copy amount up to end of NIC memory. */
ne2000_readmem(buf, dest, tmp_amount);
len -= tmp_amount;
buf = RX_BUFBASE + (rec_page_start << ED_PAGE_SHIFT);
dest += tmp_amount;
}
ne2000_readmem(buf, dest, len);
}
int
EtherReceive(char *pkt, int maxlen)
{
struct dp8390_ring packet_hdr;
int packet_ptr;
u_short len;
u_char boundary, current;
#ifdef DP8390_OLDCHIPS
u_char nlen;
#endif
/* Set NIC to page 1 registers to get 'current' pointer. */
NIC_PUT(ED_P0_CR, dp8390_cr_proto | ED_CR_PAGE_1 | ED_CR_STA);
/*
* 'sc->next_packet' is the logical beginning of the ring-buffer - i.e.
* it points to where new data has been buffered. The 'CURR' (current)
* register points to the logical end of the ring-buffer - i.e. it
* points to where additional new data will be added. We loop here
* until the logical beginning equals the logical end (or in other
* words, until the ring-buffer is empty).
*/
current = NIC_GET(ED_P1_CURR);
/* Set NIC to page 0 registers to update boundary register. */
NIC_PUT(ED_P1_CR, dp8390_cr_proto | ED_CR_PAGE_0 | ED_CR_STA);
if (next_packet == current)
return 0;
/* Get pointer to this buffer's header structure. */
packet_ptr = RX_BUFBASE + (next_packet << ED_PAGE_SHIFT);
/*
* The byte count includes a 4 byte header that was added by
* the NIC.
*/
ne2000_readmem(packet_ptr, (void *)&packet_hdr, 4);
len = le16toh(packet_hdr.count);
#ifdef DP8390_OLDCHIPS
/*
* Try do deal with old, buggy chips that sometimes duplicate
* the low byte of the length into the high byte. We do this
* by simply ignoring the high byte of the length and always
* recalculating it.
*
* NOTE: sc->next_packet is pointing at the current packet.
*/
if (packet_hdr.next_packet >= next_packet)
nlen = (packet_hdr.next_packet - next_packet);
else
nlen = ((packet_hdr.next_packet - rec_page_start) +
(rec_page_stop - next_packet));
--nlen;
if ((len & ED_PAGE_MASK) + sizeof(packet_hdr) > ED_PAGE_SIZE)
--nlen;
len = (len & ED_PAGE_MASK) | (nlen << ED_PAGE_SHIFT);
#ifdef DIAGNOSTIC
if (len != packet_hdr.count) {
printf(IFNAME ": length does not match next packet pointer\n");
printf(IFNAME ": len %04x nlen %04x start %02x "
"first %02x curr %02x next %02x stop %02x\n",
packet_hdr.count, len,
rec_page_start, next_packet, current,
packet_hdr.next_packet, rec_page_stop);
}
#endif
#endif
len -= sizeof(struct dp8390_ring);
if (len <= maxlen) {
/* Go get packet. */
dp8390_read(packet_ptr + sizeof(struct dp8390_ring),
pkt, len);
} else
len = 0;
/* Update next packet pointer. */
next_packet = packet_hdr.next_packet;
/*
* Update NIC boundary pointer - being careful to keep it one
* buffer behind (as recommended by NS databook).
*/
boundary = next_packet - 1;
if (boundary < rec_page_start)
boundary = rec_page_stop - 1;
NIC_PUT(ED_P0_BNRY, boundary);
