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/* e2100.c: A Cabletron E2100 series ethernet driver for linux. */

/*

        Written 1993-1994 by Donald Becker.

        Copyright 1994 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@cesdis.gsfc.nasa.gov, or

        C/O Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

        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 three bits of next outb() *address*

        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 obfuscate 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.

*/

static const char *version =

        "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/ioport.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <asm/io.h>

#include <asm/system.h>

#include "8390.h"

static int e21_probe_list[] = {0x300, 0x280, 0x380, 0x220, 0};

/* Offsets from the base_addr.

   Read from the ASIC register, and the low three bits of the next outb()

   address is used to set the corresponding 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 media select ...  */

#define E21_MEDIA               0x14    /* (alias). */

#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 E21_IO_EXTENT    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 void e21_block_input(struct device *dev, int count,

                                                   struct sk_buff *skb, int ring_offset);

static void e21_block_output(struct device *dev, int count,

                                                         const unsigned char *buf, const int start_page);

static void e21_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,

                                                        int ring_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;

        int 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 = e21_probe_list; *port; port++) {

                if (check_region(*port, E21_IO_EXTENT))

                        continue;

                if (e21_probe1(dev, *port) == 0)

                        return 0;

        }

        return ENODEV;

}

int e21_probe1(struct device *dev, int ioaddr)

{

        int i, status;

        unsigned char *station_addr = dev->dev_addr;

        static unsigned version_printed = 0;

        /* First check the station address for the Ctron prefix. */

        if (inb(ioaddr + E21_SAPROM + 0) != 0x00

                || inb(ioaddr + E21_SAPROM + 1) != 0x00

                || inb(ioaddr + E21_SAPROM + 2) != 0x1d)

                return ENODEV;

        /* Verify by making certain that there is a 8390 at there. */

        outb(E8390_NODMA + E8390_STOP, ioaddr);

        SLOW_DOWN_IO;

        status = inb(ioaddr);

        if (status != 0x21 && status != 0x23)

                return ENODEV;

        /* Read the station address PROM.  */

        for (i = 0; i < 6; i++)

                station_addr[i] = inb(ioaddr + E21_SAPROM + i);

        inb(ioaddr + E21_MEDIA);                /* Point to media selection. */

        outb(0, ioaddr + E21_ASIC);      /* and disable the secondary interface. */

        if (ei_debug  &&  version_printed++ == 0)

                printk(version);

        /* We should have a "dev" from Space.c or the static module table. */

        if (dev == NULL) {

                printk("e2100.c: Passed a NULL device.\n");

                dev = init_etherdev(0, 0);

        }

        printk("%s: E21** at %#3x,", dev->name, ioaddr);

        for (i = 0; i < 6; i++)

                printk(" %02X", station_addr[i]);

        if (dev->irq < 2) {

                int irqlist[] = {15,11,10,12,5,9,3,4}, i;

                for (i = 0; i < 8; i++)

                        if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {

                                dev->irq = irqlist[i];

                                break;

                        }

                if (i >= 8) {

                        printk(" unable to get IRQ %d.\n", dev->irq);

                        return EAGAIN;

                }

        } else if (dev->irq == 2)       /* Fixup luser bogosity: IRQ2 is really IRQ9 */

                dev->irq = 9;

        /* Allocate dev->priv and fill in 8390 specific dev fields. */

        if (ethdev_init(dev)) {

                printk (" unable to get memory for dev->priv.\n");

                return -ENOMEM;

        }

        /* Grab the region so we can find a different board if IRQ select fails. */

        request_region(ioaddr, E21_IO_EXTENT, "e2100");

        /* The 8390 is at the base address. */

        dev->base_addr = ioaddr;

        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;

        ei_status.saved_irq = dev->irq;

        /* 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(ioaddr + E21_MEDIA);        /* Turn automatic media detection on. */

                for(i = 0; i < 6; i++)

                        if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) {

                                dev->if_port = 1;

                                break;

                        }

        }

        /* 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 media, memory @ %#lx.\n", dev->irq,

                   dev->if_port ? "secondary" : "primary", dev->mem_start);

        ei_status.reset_8390 = &e21_reset_8390;

        ei_status.block_input = &e21_block_input;

        ei_status.block_output = &e21_block_output;

        ei_status.get_8390_hdr = &e21_get_8390_hdr;

        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;

        if (request_irq(dev->irq, ei_interrupt, 0, "e2100", NULL)) {

                return EBUSY;

        }

        irq2dev_map[dev->irq] = dev;

        /* Set the interrupt line and memory base on the hardware. */

        inb(ioaddr + E21_IRQ_LOW);

        outb(0, ioaddr + E21_ASIC + (dev->irq & 7));

        inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */

        outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)

                   + (dev->if_port ? E21_ALT_IFPORT : 0));

        inb(ioaddr + E21_MEM_BASE);

        outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));

        ei_open(dev);

        MOD_INC_USE_COUNT;

        return 0;

}

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=%ld...", 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;

}

/* Grab the 8390 specific header. We put the 2k window so the header page

   appears at the start of the shared memory. */

static void

e21_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)

{

        short ioaddr = dev->base_addr;

        char *shared_mem = (char *)dev->mem_start;

        mem_on(ioaddr, shared_mem, ring_page);

#ifdef notdef

        /* Officially this is what we are doing, but the readl() is faster */

        memcpy_fromio(hdr, shared_mem, sizeof(struct e8390_pkt_hdr));

#else

        ((unsigned int*)hdr)[0] = readl(shared_mem);

#endif

        /* Turn off memory access: we would need to reprogram the window anyway. */

        mem_off(ioaddr);

}

/*  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 void

e21_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)

{

        short ioaddr = dev->base_addr;

        char *shared_mem = (char *)dev->mem_start;

        mem_on(ioaddr, shared_mem, (ring_offset>>8));

        /* Packet is always in one chunk -- we can copy + cksum. */

        eth_io_copy_and_sum(skb, dev->mem_start + (ring_offset & 0xff), count, 0);

        mem_off(ioaddr);

}

static void

e21_block_output(struct device *dev, int count, const unsigned char *buf,

                                 const 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 specifying the starting page. */

        readb(shared_mem + start_page);

        mem_on(ioaddr, shared_mem, start_page);

        memcpy_toio(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);

        free_irq(dev->irq, NULL);

        dev->irq = ei_status.saved_irq;

        /* Shut off the interrupt line and secondary interface. */

        inb(ioaddr + E21_IRQ_LOW);

        outb(0, ioaddr + E21_ASIC);

        inb(ioaddr + E21_IRQ_HIGH);                     /* High IRQ bit, and if_port. */

        outb(0, ioaddr + E21_ASIC);

        irq2dev_map[dev->irq] = NULL;

        ei_close(dev);

        /* Double-check that the memory has been turned off, because really

           really bad things happen if it isn't. */

        mem_off(ioaddr);

        MOD_DEC_USE_COUNT;

        return 0;

}

#ifdef HAVE_DEVLIST

struct netdev_entry e21_drv =

{"e21", e21_probe1, E21_IO_EXTENT, e21_probe_list};

#endif

#ifdef MODULE

#define MAX_E21_CARDS   4       /* Max number of E21 cards per module */

#define NAMELEN         8       /* # of chars for storing dev->name */

static char namelist[NAMELEN * MAX_E21_CARDS] = { 0, };

static struct device dev_e21[MAX_E21_CARDS] = {

        {

                NULL,           /* assign a chunk of namelist[] below */

                0, 0, 0, 0,

                0, 0,

                0, 0, 0, NULL, NULL

        },

};

static int io[MAX_E21_CARDS] = { 0, };

static int irq[MAX_E21_CARDS]  = { 0, };

static int mem[MAX_E21_CARDS] = { 0, };

static int xcvr[MAX_E21_CARDS] = { 0, };         /* choose int. or ext. xcvr */

/* This is set up so that only a single autoprobe takes place per call.

ISA device autoprobes on a running machine are not recommended. */

int

init_module(void)

{

        int this_dev, found = 0;

        for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {

                struct device *dev = &dev_e21[this_dev];

                dev->name = namelist+(NAMELEN*this_dev);

                dev->irq = irq[this_dev];

                dev->base_addr = io[this_dev];

                dev->mem_start = mem[this_dev];

                dev->mem_end = xcvr[this_dev];  /* low 4bits = xcvr sel. */

                dev->init = e2100_probe;

                if (io[this_dev] == 0)  {

                        if (this_dev != 0) break; /* only autoprobe 1st one */

                        printk(KERN_NOTICE "e2100.c: Presently autoprobing (not recommended) for a single card.\n");

                }

                if (register_netdev(dev) != 0) {

                        printk(KERN_WARNING "e2100.c: No E2100 card found (i/o = 0x%x).\n", io[this_dev]);

                        if (found != 0) return 0; /* Got at least one. */

                        return -ENXIO;

                }

                found++;

        }

        return 0;

}

void

cleanup_module(void)

{

        int this_dev;

        for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {

                struct device *dev = &dev_e21[this_dev];

                if (dev->priv != NULL) {

                        /* NB: e21_close() handles free_irq + irq2dev map */

                        kfree(dev->priv);

                        dev->priv = NULL;

                        release_region(dev->base_addr, E21_IO_EXTENT);

                        unregister_netdev(dev);

                }

        }

}

#endif /* MODULE */

/*

 * 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:

 */