341 lines
11 KiB
C
341 lines
11 KiB
C
/* 3c503.c: A shared-memory NS8390 ethernet driver for linux. */
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/*
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Written 1992,1993 by Donald Becker. This is alpha test code.
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This is a extension to the Linux operating system, and is covered by
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same Gnu Public License that covers that work.
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This driver should work with the 3c503 and 3c503/16. It must be used
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in shared memory mode.
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The Author may be reached as becker@super.org or
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C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
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*/
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static char *version = "3c503.c:v0.28 1/28/93 Donald Becker (becker@super.org)\n";
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include "dev.h"
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#include "8390.h"
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#include "3c503reg.h"
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#define EL2AUTOPROBE
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extern void NS8390_init(struct device *dev, int startp);
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extern int ei_debug;
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extern struct sigaction ei_sigaction;
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extern struct ei_device ei_status;
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int etherlink2 = 0;
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int el2autoprobe(int ioaddr, struct device *dev);
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int el2probe(int ioaddr, struct device *dev);
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static void el2_reset_8390(struct device *dev);
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static void el2_init_card(struct device *dev);
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static void el2_block_output(struct device *dev, int count,
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const unsigned char *buf, const start_page);
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static int el2_block_input(struct device *dev, int count, char *buf,
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int ring_offset);
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int
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el2autoprobe(int ioaddr, struct device *dev)
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{
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int *addr, addrs[] = { 0xddfff, 0xd9fff, 0xcdfff, 0xc9fff, 0};
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int ports[] = {0, 0x300, 0x310, 0x330, 0x350, 0x250, 0x280, 0x2a0, 0x2e0, 0};
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/* Non-autoprobe case first: */
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if (ioaddr > 0)
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if (el2probe(ioaddr, dev))
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return dev->base_addr = ioaddr;
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else
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return 0;
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/* We check for a memory-mapped 3c503 board by looking at the
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end of boot PROM space (works even if a PROM isn't there). */
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for (addr = addrs; *addr; addr++) {
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unsigned int base_bits = *(unsigned char *)*addr, i;
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/* Find first set bit. */
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for(i = 8; i; i--, base_bits >>= 1)
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if (base_bits & 0x1)
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break;
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if (base_bits == 1 && el2probe(ports[i], dev))
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return dev->base_addr = ports[i];
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}
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#ifdef notdef
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/* If it's not memory mapped, we don't care to find it. I haven't
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tested the non-memory-mapped code. */
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/* It's not memory mapped -- try all of the locations that aren't
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obviously empty. */
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{ int *port;
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for (port = &ports[1]; *port; port++)
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if (inb_p(*port) != 0xff && el2probe(*port, dev))
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return dev->base_addr = *port;
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}
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#endif
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return 0;
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}
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/* Probe for the Etherlink II card at I/O port base IOADDR,
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returning non-zero on sucess. If found, set the station
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address and memory parameters in DEVICE. */
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int
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el2probe(int ioaddr, struct device *dev)
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{
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int i, found, mem_jumpers;
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unsigned char *station_addr = dev->dev_addr;
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/* We verify that it's a 3C503 board by checking the first three octets
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of its ethernet address. */
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printk("3c503 probe at %#3x:", ioaddr);
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outb_p(ECNTRL_RESET|ECNTRL_THIN, ioaddr + 0x406); /* Reset it... */
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outb_p(ECNTRL_THIN, ioaddr + 0x406);
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/* Map the station addr PROM into the lower I/O ports. */
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outb(ECNTRL_SAPROM|ECNTRL_THIN, ioaddr + 0x406);
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for (i = 0; i < ETHER_ADDR_LEN; i++) {
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printk(" %2.2X", (station_addr[i] = inb(ioaddr + i)));
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}
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/* Map the 8390 back into the window. */
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outb(ECNTRL_THIN, ioaddr + 0x406);
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found =( station_addr[0] == 0x02
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&& station_addr[1] == 0x60
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&& station_addr[2] == 0x8c);
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if (! found) {
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printk(" 3C503 not found.\n");
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return 0;
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}
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/* Probe for, turn on and clear the board's shared memory. */
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mem_jumpers = inb(ioaddr + 0x404); /* E33G_ROMBASE */
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if (ei_debug > 2) printk(" memory jumpers %2.2x ", mem_jumpers);
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outb(EGACFR_IRQOFF, E33G_GACFR); /* Enable RAM */
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if ((mem_jumpers & 0xf0) == 0) {
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dev->mem_start = 0;
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if (ei_debug > 1) printk(" no shared memory ");
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} else {
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dev->mem_start = ((mem_jumpers & 0xc0) ? 0xD8000 : 0xC8000) +
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((mem_jumpers & 0xA0) ? 0x4000 : 0);
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#define EL2_MEMSIZE (EL2SM_STOP_PG - EL2SM_START_PG)*256
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#ifdef EL2MEMTEST
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{ /* Check the card's memory. */
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int *mem_base = (int *)dev->mem_start;
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int memtest_value = 0xbbadf00d;
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mem_base[0] = 0xba5eba5e;
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for (i = 1; i < EL2_MEMSIZE/sizeof(mem_base[0]); i++) {
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mem_base[i] = memtest_value;
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if (mem_base[0] != 0xba5eba5e
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|| mem_base[i] != memtest_value) {
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printk(" memory failure or memory address conflict.\n");
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dev->mem_start = 0;
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break;
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}
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memtest_value += 0x55555555;
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mem_base[i] = 0;
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}
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}
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#endif /* EL2MEMTEST */
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/* Divide the on-board memory into a single maximum-sized transmit
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(double-sized for ping-pong transmit) buffer at the base, and
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use the rest as a receive ring. */
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dev->mem_end = dev->rmem_end = dev->mem_start + EL2_MEMSIZE;
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dev->rmem_start = TX_PAGES*256 + dev->mem_start;
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}
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if (ei_debug > 2)
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printk("\n3c503: memory params start=%#5x rstart=%#5x end=%#5x rend=%#5x.\n",
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dev->mem_start, dev->rmem_start, dev->mem_end, dev->rmem_end);
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/* Finish setting the board's parameters. */
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etherlink2 = 1;
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ei_status.tx_start_page = EL2SM_START_PG;
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ei_status.rx_start_page = EL2SM_START_PG + TX_PAGES;
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ei_status.stop_page = EL2SM_STOP_PG;
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ei_status.reset_8390 = &el2_reset_8390;
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ei_status.block_input = &el2_block_input;
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ei_status.block_output = &el2_block_output;
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/* This should be probed for (or set via an ioctl()) at run-time someday. */
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#ifdef EI8390_THICK
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ei_status.thin_bit = 0;
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#else
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ei_status.thin_bit = ECNTRL_THIN;
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#endif
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if (dev->irq <= 0)
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dev->irq = 5; /* Autoprobe guess... */
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if (dev->irq == 2)
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dev->irq = 9;
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else if (dev->irq != 9 && (dev->irq > 5 || dev->irq < 3)) {
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printk("\n3c503: configured interrupt number %d out of range.\n",
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dev->irq);
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return 0;
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}
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if (irqaction (dev->irq, &ei_sigaction)) {
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printk ("\n3c503: Unable to get IRQ%d.\n", dev->irq);
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/* We could look for other free interrupts here, or something... */
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return 0;
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}
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el2_init_card(dev);
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if (dev->mem_start)
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printk("3c503 found, memory at %#6x, IRQ %d\n",
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dev->mem_start, dev->irq);
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else
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printk(" 3c503 found, no shared memory, IRQ %d\n", dev->irq);
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if (ei_debug > 2)
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printk(version);
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return ioaddr;
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}
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/* This is called whenever we have a unrecoverable failure:
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transmit timeout
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Bad ring buffer packet header
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*/
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static void
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el2_reset_8390(struct device *dev)
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{
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if (ei_debug > 1) printk("3c503: Resetting the board...");
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outb_p(ECNTRL_RESET|ECNTRL_THIN, E33G_CNTRL);
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ei_status.txing = 0;
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outb_p(ei_status.thin_bit, E33G_CNTRL);
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el2_init_card(dev);
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if (ei_debug > 1) printk("done\n");
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}
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/* Initialize the 3c503 GA registers after a reset. */
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static void
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el2_init_card(struct device *dev)
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{
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/* Unmap the station PROM and select the DIX or BNC connector. */
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outb_p(ei_status.thin_bit, E33G_CNTRL);
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/* Set ASIC copy of rx's first and last+1 buffer pages */
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/* These must be the same as in the 8390. */
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outb(ei_status.rx_start_page, E33G_STARTPG);
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outb(ei_status.stop_page, E33G_STOPPG);
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/* Point the vector pointer registers somewhere ?harmless?. */
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outb(0xff, E33G_VP2); /* Point at the ROM restart location 0xffff0 */
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outb(0xff, E33G_VP1);
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outb(0x00, E33G_VP0);
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/* Turn off all interrupts until we're opened. */
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outb_p(0x00, dev->base_addr + EN0_IMR);
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outb_p(EGACFR_IRQOFF, E33G_GACFR);
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/* Set the interrupt line. */
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outb_p((0x04 << (dev->irq == 9 ? 2 : dev->irq)), E33G_IDCFR);
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outb_p(8, E33G_DRQCNT); /* Set burst size to 8 */
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outb_p(0x20, E33G_DMAAH); /* Put a valid addr in the GA DMA */
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outb_p(0x00, E33G_DMAAL);
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return; /* We always succeed */
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}
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/* Either use the shared memory (if enabled on the board) or put the packet
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out through the ASIC FIFO. The latter is probably much slower. */
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static void
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el2_block_output(struct device *dev, int count,
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const unsigned char *buf, const start_page)
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{
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int i; /* Buffer index */
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int boguscount = 0; /* timeout counter */
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if (dev->mem_start) { /* Shared memory transfer */
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void *dest_addr = (void *)(dev->mem_start +
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((start_page - ei_status.tx_start_page) << 8));
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outb(EGACFR_NORM, E33G_GACFR); /* Enable RAM */
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memcpy(dest_addr, buf, count);
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if (ei_debug > 2 && memcmp(dest_addr, buf, count))
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printk("3c503: send_packet() bad memory copy @ %#5x.\n",
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dest_addr);
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else if (ei_debug > 4)
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printk("3c503: send_packet() good memory copy @ %#5x.\n",
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dest_addr);
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return;
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}
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/* Set up then start the internal memory transfer to Tx Start Page */
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outb(0x00, E33G_DMAAL);
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outb(start_page, E33G_DMAAH);
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outb(ei_status.thin_bit | ECNTRL_OUTPUT | ECNTRL_START, E33G_CNTRL);
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/* This is the byte copy loop: it should probably be tuned for
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for speed once everything is working. I think it is possible
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to output 8 bytes between each check of the status bit. */
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for(i = 0; i < count; i++) {
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if (count % 8 == 7)
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while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
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if (++boguscount > 32) {
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printk(EI_NAME": fifo blocked in el2_block_output.\n");
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return;
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}
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outb(buf[i], E33G_FIFOH);
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}
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outb(ei_status.thin_bit, E33G_CNTRL);
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return;
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}
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/* Returns the new ring pointer. */
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static int
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el2_block_input(struct device *dev, int count, char *buf, int ring_offset)
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{
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int boguscount = 0;
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int end_of_ring = dev->rmem_end;
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ring_offset -= (EL2SM_START_PG<<8);
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/* Maybe enable shared memory just be to be safe... nahh.*/
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if (dev->mem_start) { /* Use the shared memory. */
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if (dev->mem_start + ring_offset + count > end_of_ring) {
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/* We must wrap the input move. */
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int semi_count = end_of_ring - (dev->mem_start + ring_offset);
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if (ei_debug > 4)
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printk("3c503: block_input() @ %#5x+%x=%5x.\n",
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dev->mem_start, ring_offset,
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(char *)dev->mem_start + ring_offset);
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memcpy(buf, (char *)dev->mem_start + ring_offset, semi_count);
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count -= semi_count;
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memcpy(buf + semi_count, (char *)dev->rmem_start, count);
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return dev->rmem_start + count;
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}
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if (ei_debug > 4)
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printk("3c503: block_input() @ %#5x+%x=%5x.\n",
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dev->mem_start, ring_offset,
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(char *)dev->mem_start + ring_offset);
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memcpy(buf, (char *)dev->mem_start + ring_offset, count);
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return ring_offset + count;
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} else { /* No shared memory, use the fifo. */
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int i;
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outb(ring_offset & 0xff, E33G_DMAAL);
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outb((ring_offset >> 8) & 0xff, E33G_DMAAH);
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outb(ei_status.thin_bit | ECNTRL_INPUT | ECNTRL_START, E33G_CNTRL);
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/* This is the byte copy loop: it should probably be tuned for
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for speed once everything is working. */
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for(i = 0; i < count; i++) {
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if (count % 8 == 7)
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while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
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if (++boguscount > 32) {
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printk(EI_NAME": fifo blocked in el2_block_input().\n");
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return 0;
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}
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buf[i] = inb(E33G_FIFOH);
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}
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outb(ei_status.thin_bit, E33G_CNTRL);
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ring_offset += count;
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if (ring_offset >= end_of_ring)
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ring_offset = dev->rmem_start + ring_offset - end_of_ring;
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return ring_offset;
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}
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}
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/*
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* Local variables:
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* compile-command: "gcc -DKERNEL -Wall -O6 -fomit-frame-pointer -I/usr/src/linux/net/tcp -c 3c503.c"
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* version-control: t
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* kept-new-versions: 5
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* End:
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*/
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