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- From b63062.STUDENT.cwru.edu!root Sat Apr 16 15:19:29 1994
- /* e2100.c: A Cabletron E2100 series ethernet driver for linux. */
- /*
- Written 1993 by Donald Becker.
- Copyright 1993 United States Government as represented by the
- Director, National Security Agency. This software may be used and
- distributed according to the terms of the GNU Public License,
- incorporated herein by reference.
-
- This is a driver for the Cabletron E2100 series ethercards.
-
- The Author may be reached as becker@super.org or
- C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
-
- The E2100 series ethercard is a fairly generic shared memory 8390
- implementation. The only unusual aspect is the way the shared memory
- registers are set: first you do an inb() in what is normally the
- station address region, and the low four bits of next outb() is used
- as the write value for that register. Either someone wasn't too used
- to dem bit en bites, or they were trying to obfusicate the programming
- interface.
-
- There is an additional complication when setting the window on the packet
- buffer. You must first do a read into the packet buffer region with the
- low 8 address bits the address setting the page for the start of the packet
- buffer window, and then do the above operation. See mem_on() for details.
-
- One bug on the chip is that even a hard reset won't disable the memory
- window, usually resulting in a hung machine if mem_off() isn't called.
- If this happens, you must power down the machine for about 30 seconds.
-
- Modified by
- b63062.STUDENT.cwru.edu!root Apr 14 1994 for NET3
-
- THIS DRIVER IS NOT SUPPORTED BY DONALD BECKER.
-
- */
-
- static char *version =
- "e2100.c:v0.01 11/21/93 Donald Becker (becker@super.org)\n";
-
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <asm/io.h>
- #include <asm/system.h>
- #ifndef PRE_PL13
- #include <linux/ioport.h> /* Delete if your kernel doesn't have it. */
- #endif
-
- #include <linux/netdevice.h>
- #include "8390.h"
-
- /* Compatibility definitions for earlier kernel versions. */
- #ifndef HAVE_PORTRESERVE
- #define check_region(ioaddr, size) 0
- #define snarf_region(ioaddr, size); do ; while (0)
- #endif
- #ifndef HAVE_AUTOIRQ
- /* From auto_irq.c, in ioport.h for later versions. */
- extern void autoirq_setup(int waittime);
- extern int autoirq_report(int waittime);
- /* The map from IRQ number (as passed to the interrupt handler) to
- 'struct device'. */
- extern struct device *irq2dev_map[16];
- #endif
-
- /* Offsets from the base_addr.
- Read from the ASIC register, and the low 3(?) bits of the next outb() address
- is used to set the cooresponding register. */
- #define E21_NIC_OFFSET 0 /* Offset to the 8390 NIC. */
- #define E21_ASIC 0x10
- #define E21_MEM_ENABLE 0x10
- #define E21_MEM_ON 0x05 /* Enable memory in 16 bit mode. */
- #define E21_MEM_ON_8 0x07 /* Enable memory in 8 bit mode. */
- #define E21_MEM_BASE 0x11
- #define E21_IRQ_LOW 0x12 /* The low three bits of the IRQ number. */
- #define E21_IRQ_HIGH 0x14 /* The high IRQ bit, and ... */
- #define E21_ALT_IFPORT 0x02 /* Set to use the other (BNC,AUI) port. */
- #define E21_BIG_MEM 0x04 /* Use a bigger (64K) buffer (we don't) */
- #define E21_SAPROM 0x10 /* Offset to station address data. */
- #define ETHERCARD_TOTAL_SIZE 0x20
-
- extern inline void mem_on(short port, volatile char *mem_base,
- unsigned char start_page )
- {
- /* This is a little weird: set the shared memory window by doing a
- read. The low address bits specify the starting page. */
- mem_base[start_page];
- inb(port + E21_MEM_ENABLE);
- outb(E21_MEM_ON, port + E21_MEM_ENABLE + E21_MEM_ON);
- }
-
- extern inline void mem_off(short port)
- {
- inb(port + E21_MEM_ENABLE);
- outb(0x00, port + E21_MEM_ENABLE);
- }
-
- /* In other drivers I put the TX pages first, but the E2100 window circuitry
- is designed to have a 4K Tx region last. The windowing circuitry wraps the
- window at 0x2fff->0x0000 so that the packets at e.g. 0x2f00 in the RX ring
- appear contiguously in the window. */
- #define E21_RX_START_PG 0x00 /* First page of RX buffer */
- #define E21_RX_STOP_PG 0x30 /* Last page +1 of RX ring */
- #define E21_BIG_RX_STOP_PG 0xF0 /* Last page +1 of RX ring */
- #define E21_TX_START_PG E21_RX_STOP_PG /* First page of TX buffer */
-
- int e2100_probe(struct device *dev);
- int e21_probe1(struct device *dev, int ioaddr);
-
- static int e21_open(struct device *dev);
- static void e21_reset_8390(struct device *dev);
- static int e21_block_input(struct device *dev, int count,
- char *buf, int ring_offset);
- static void e21_block_output(struct device *dev, int count,
- const unsigned char *buf, const start_page);
- static int e21_close(struct device *dev);
-
-
- /* Probe for the E2100 series ethercards. These cards have an 8390 at the
- base address and the station address at both offset 0x10 and 0x18. I read
- the station address from offset 0x18 to avoid the dataport of NE2000
- ethercards, and look for Ctron's unique ID (first three octets of the
- station address).
- */
-
- int e2100_probe(struct device *dev)
- {
- int *port, ports[] = {0x300, 0x280, 0x380, 0};
- short base_addr = dev->base_addr;
-
- if (base_addr > 0x1ff) /* Check a single specified location. */
- return e21_probe1(dev, base_addr);
- else if (base_addr > 0) /* Don't probe at all. */
- return ENXIO;
-
- for (port = &ports[0]; *port; port++) {
- ushort ioaddr = *port;
- int i;
-
- if (check_region(ioaddr, ETHERCARD_TOTAL_SIZE))
- continue;
-
- #ifdef testing_only
- printk("%s: E21xx at %#3x: ", dev->name, ioaddr);
- for (i = 0; i < 16; i++)
- printk(" %02X", inb(ioaddr + E21_SAPROM + i));
- printk("\n");
- #endif
-
-
- if (inb(ioaddr + E21_SAPROM + 0) == 0x00
- && inb(ioaddr + E21_SAPROM + 1) == 0x00
- && inb(ioaddr + E21_SAPROM + 2) == 0x1d
- && e21_probe1(dev, ioaddr) == 0)
- return 0;
- }
- return -ENODEV;
- }
-
- int e21_probe1(struct device *dev, int ioaddr)
- {
- int i, status;
- unsigned char *station_addr = dev->dev_addr;
-
- /* We've already checked the station address prefix, now verify by making
- certain that there is a 8390 at the expected location. */
- outb(E8390_NODMA + E8390_STOP, ioaddr);
- SLOW_DOWN_IO;
- status = inb(ioaddr);
- if (status != 0x21 && status != 0x23)
- return -ENODEV;
-
- #ifdef testing_only
- printk("%s: E21xx at %#3x (PAXI backwards): ", dev->name, ioaddr);
- for (i = 0; i < 16; i++)
- printk(" %02X", inb(ioaddr + 0x1f - i));
- printk("\n");
- #endif
-
- /* Read the station address PROM. */
- for (i = 0; i < 6; i++)
- station_addr[i] = inb(ioaddr + E21_SAPROM + i);
-
- /* Grab the region so we can find another board if needed . */
- snarf_region(ioaddr, ETHERCARD_TOTAL_SIZE);
-
- printk("%s: E21xx at %#3x, ", dev->name, ioaddr);
- for (i = 0; i < 6; i++)
- printk(" %02X", station_addr[i]);
-
- if (dev->irq < 2) {
- int irqlist[] = {9,15,11,10,12,5,3,4,0}, i;
- for (i = 0; irqlist[i] ; i++)
- if (request_irq (irqlist[i], NULL) != -EBUSY) {
- dev->irq = irqlist[i];
- break;
- }
- } else if (dev->irq == 2) /* Fixup bogosity: IRQ2 is really IRQ9 */
- dev->irq = 9;
-
- /* Snarf the interrupt now. */
- if (irqaction (dev->irq, &ei_sigaction)) {
- printk (" unable to get IRQ %d.\n", dev->irq);
- return -EBUSY;
- }
-
- /* The 8390 is at the base address. */
- dev->base_addr = ioaddr;
-
- ethdev_init(dev);
-
- ei_status.name = "E2100";
- ei_status.word16 = 1;
- ei_status.tx_start_page = E21_TX_START_PG;
- ei_status.rx_start_page = E21_RX_START_PG;
- ei_status.stop_page = E21_RX_STOP_PG;
-
- /* Check the media port used. The port can be passed in on the
- low mem_end bits. */
- if (dev->mem_end & 15)
- dev->if_port = dev->mem_end & 7;
- else {
- dev->if_port = 0;
- inb_p(ioaddr + E21_IRQ_HIGH); /* Select if_port detect. */
- for(i = 0; i < 6; i++)
- if (station_addr[i] != inb(ioaddr + E21_SAPROM))
- dev->if_port = 1;
- }
-
- dev->if_port = 0;
-
- /* Never map in the E21 shared memory unless you are actively using it.
- Also, the shared memory has effective only one setting -- spread all
- over the 128K region! */
- if (dev->mem_start == 0)
- dev->mem_start = 0xd0000;
-
- #ifdef notdef
- /* These values are unused. The E2100 has a 2K window into the packet
- buffer. The window can be set to start on any page boundary. */
- dev->rmem_start = dev->mem_start + TX_PAGES*256;
- dev->mem_end = dev->rmem_end = dev->mem_start + 2*1024;
- #endif
-
- printk(" IRQ %d, %s interface, memory at %#x-%#x.\n", dev->irq,
- dev->if_port ? "secondary" : "primary", dev->mem_start,
- dev->mem_start + 2*1024 - 1);
-
- if (ei_debug > 0)
- printk(version);
-
- ei_status.reset_8390 = &e21_reset_8390;
- ei_status.block_input = &e21_block_input;
- ei_status.block_output = &e21_block_output;
- dev->open = &e21_open;
- dev->stop = &e21_close;
- NS8390_init(dev, 0);
-
- return 0;
- }
-
- static int
- e21_open(struct device *dev)
- {
- short ioaddr = dev->base_addr;
-
- /* Set the interrupt line and memory base on the hardware. */
- inb_p(ioaddr + E21_IRQ_LOW);
- outb_p(0, ioaddr + E21_ASIC + (dev->irq & 7));
- inb_p(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */
- outb_p(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)
- + (dev->if_port ? E21_ALT_IFPORT : 0));
- inb_p(ioaddr + E21_MEM_BASE);
- outb_p(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));
-
- return ei_open(dev);
- }
-
- static void
- e21_reset_8390(struct device *dev)
- {
- short ioaddr = dev->base_addr;
-
- outb(0x01, ioaddr);
- if (ei_debug > 1) printk("resetting the E2180x3 t=%d...", jiffies);
- ei_status.txing = 0;
-
- /* Set up the ASIC registers, just in case something changed them. */
-
- if (ei_debug > 1) printk("reset done\n");
- return;
- }
-
- /* Block input and output are easy on shared memory ethercards. The E21xx makes
- block_input() especially easy by wrapping the top ring buffer to the bottom
- automatically. */
- static int
- e21_block_input(struct device *dev, int count, char *buf, int ring_offset)
- {
- short ioaddr = dev->base_addr;
- char *shared_mem = (char *)dev->mem_start;
- int start_page = (ring_offset>>8);
-
- mem_on(ioaddr, shared_mem, start_page);
-
- /* We'll always get a 4 byte header read first. */
- if (count == 4)
- ((int*)buf)[0] = ((int*)shared_mem)[0];
- else
- memcpy(buf, shared_mem + (ring_offset & 0xff), count);
-
- /* Turn off memory access: we would need to reprogram the window anyway. */
- mem_off(ioaddr);
-
- return 0;
- }
-
- static void
- e21_block_output(struct device *dev, int count, const unsigned char *buf,
- int start_page)
- {
- short ioaddr = dev->base_addr;
- volatile char *shared_mem = (char *)dev->mem_start;
-
- /* Set the shared memory window start by doing a read, with the low address
- bits specifing the starting page. */
- *(shared_mem + start_page);
- mem_on(ioaddr, shared_mem, start_page);
-
- memcpy((char*)shared_mem, buf, count);
- mem_off(ioaddr);
- }
-
- static int
- e21_close(struct device *dev)
- {
- short ioaddr = dev->base_addr;
-
- if (ei_debug > 1)
- printk("%s: Shutting down ethercard.\n", dev->name);
- NS8390_init(dev, 0);
-
- mem_off(ioaddr);
-
- return 0;
- }
-
-
- /*
- * Local variables:
- * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c e2100.c"
- * version-control: t
- * tab-width: 4
- * kept-new-versions: 5
- * End:
- */
-
-
-