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/* smc-ultra.c: A SMC Ultra ethernet driver for linux. */

/*

        This is a driver for the SMC Ultra and SMC EtherEZ ISA ethercards.

        Written 1993-1998 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.

        The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O

        Center of Excellence in Space Data and Information Sciences

                Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

        This driver uses the cards in the 8390-compatible mode.

        Most of the run-time complexity is handled by the generic code in

        8390.c.  The code in this file is responsible for

                ultra_probe()           Detecting and initializing the card.

                ultra_probe1()

                ultra_open()            The card-specific details of starting, stopping

                ultra_reset_8390()      and resetting the 8390 NIC core.

                ultra_close()

                ultra_block_input()             Routines for reading and writing blocks of

                ultra_block_output()    packet buffer memory.

                ultra_pio_input()

                ultra_pio_output()

        This driver enables the shared memory only when doing the actual data

        transfers to avoid a bug in early version of the card that corrupted

        data transferred by a AHA1542.

        This driver now supports the programmed-I/O (PIO) data transfer mode of

        the EtherEZ. It does not use the non-8390-compatible "Altego" mode.

        That support (if available) is in smc-ez.c.

        Changelog:

        Paul Gortmaker  : multiple card support for module users.

        Donald Becker   : 4/17/96 PIO support, minor potential problems avoided.

        Donald Becker   : 6/6/96 correctly set auto-wrap bit.

*/

static const char *version =

        "smc-ultra.c:v2.02 2/3/98 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 <asm/io.h>

#include <asm/system.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include "8390.h"

/* A zero-terminated list of I/O addresses to be probed. */

static unsigned int ultra_portlist[] =

{0x200, 0x220, 0x240, 0x280, 0x300, 0x340, 0x380, 0};

int ultra_probe(struct device *dev);

int ultra_probe1(struct device *dev, int ioaddr);

static int ultra_open(struct device *dev);

static void ultra_reset_8390(struct device *dev);

static void ultra_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,

                                                int ring_page);

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

                                                  struct sk_buff *skb, int ring_offset);

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

                                                        const unsigned char *buf, const int start_page);

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

                                                int ring_page);

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

                                                  struct sk_buff *skb, int ring_offset);

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

                                                         const unsigned char *buf, const int start_page);

static int ultra_close_card(struct device *dev);

#define START_PG                0x00    /* First page of TX buffer */

#define ULTRA_CMDREG    0                /* Offset to ASIC command register. */

#define  ULTRA_RESET    0x80    /* Board reset, in ULTRA_CMDREG. */

#define  ULTRA_MEMENB   0x40    /* Enable the shared memory. */

#define IOPD    0x02                    /* I/O Pipe Data (16 bits), PIO operation. */

#define IOPA    0x07                    /* I/O Pipe Address for PIO operation. */

#define ULTRA_NIC_OFFSET  16    /* NIC register offset from the base_addr. */

#define ULTRA_IO_EXTENT 32

#define EN0_ERWCNT              0x08    /* Early receive warning count. */

/*      Probe for the Ultra.  This looks like a 8013 with the station

        address PROM at I/O ports <base>+8 to <base>+13, with a checksum

        following.

*/

#ifdef HAVE_DEVLIST

struct netdev_entry ultra_drv =

{"ultra", ultra_probe1, NETCARD_IO_EXTENT, netcard_portlist};

#else

int ultra_probe(struct device *dev)

{

        int i;

        int base_addr = dev ? dev->base_addr : 0;

        if (base_addr > 0x1ff)          /* Check a single specified location. */

                return ultra_probe1(dev, base_addr);

        else if (base_addr != 0) /* Don't probe at all. */

                return ENXIO;

        for (i = 0; ultra_portlist[i]; i++) {

                int ioaddr = ultra_portlist[i];

                if (check_region(ioaddr, ULTRA_IO_EXTENT))

                        continue;

                if (ultra_probe1(dev, ioaddr) == 0)

                        return 0;

        }

        return ENODEV;

}

#endif

int ultra_probe1(struct device *dev, int ioaddr)

{

        int i;

        int checksum = 0;

        const char *model_name;

        unsigned char eeprom_irq = 0;

        static unsigned version_printed = 0;

        /* Values from various config regs. */

        unsigned char num_pages, irqreg, addr, piomode;

        unsigned char idreg = inb(ioaddr + 7);

        unsigned char reg4 = inb(ioaddr + 4) & 0x7f;

        /* Check the ID nibble. */

        if ((idreg & 0xF0) != 0x20                      /* SMC Ultra */

                && (idreg & 0xF0) != 0x40)              /* SMC EtherEZ */

                return ENODEV;

        /* Select the station address register set. */

        outb(reg4, ioaddr + 4);

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

                checksum += inb(ioaddr + 8 + i);

        if ((checksum & 0xff) != 0xFF)

                return ENODEV;

        if (dev == NULL)

                dev = init_etherdev(0, 0);

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

                printk(version);

        model_name = (idreg & 0xF0) == 0x20 ? "SMC Ultra" : "SMC EtherEZ";

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

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

                printk(" %2.2X", dev->dev_addr[i] = inb(ioaddr + 8 + i));

        /* Switch from the station address to the alternate register set and

           read the useful registers there. */

        outb(0x80 | reg4, ioaddr + 4);

        /* Enabled FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */

        outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);

        piomode = inb(ioaddr + 0x8);

        addr = inb(ioaddr + 0xb);

        irqreg = inb(ioaddr + 0xd);

        /* Switch back to the station address register set so that the MS-DOS driver

           can find the card after a warm boot. */

        outb(reg4, ioaddr + 4);

        if (dev->irq < 2) {

                unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};

                int irq;

                /* The IRQ bits are split. */

                irq = irqmap[((irqreg & 0x40) >> 4) + ((irqreg & 0x0c) >> 2)];

                if (irq == 0) {

                        printk(", failed to detect IRQ line.\n");

                        return -EAGAIN;

                }

                dev->irq = irq;

                eeprom_irq = 1;

        }

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

        if (ethdev_init(dev)) {

                printk (", no memory for dev->priv.\n");

                return -ENOMEM;

        }

        /* OK, we are certain this is going to work.  Setup the device. */

        request_region(ioaddr, ULTRA_IO_EXTENT, model_name);

        /* The 8390 isn't at the base address, so fake the offset */

        dev->base_addr = ioaddr+ULTRA_NIC_OFFSET;

        {

                int addr_tbl[4] = {0x0C0000, 0x0E0000, 0xFC0000, 0xFE0000};

                short num_pages_tbl[4] = {0x20, 0x40, 0x80, 0xff};

                dev->mem_start = ((addr & 0x0f) << 13) + addr_tbl[(addr >> 6) & 3] ;

                num_pages = num_pages_tbl[(addr >> 4) & 3];

        }

        ei_status.name = model_name;

        ei_status.word16 = 1;

        ei_status.tx_start_page = START_PG;

        ei_status.rx_start_page = START_PG + TX_PAGES;

        ei_status.stop_page = num_pages;

        dev->rmem_start = dev->mem_start + TX_PAGES*256;

        dev->mem_end = dev->rmem_end

                = dev->mem_start + (ei_status.stop_page - START_PG)*256;

        if (piomode) {

                printk(",%s IRQ %d programmed-I/O mode.\n",

                           eeprom_irq ? "EEPROM" : "assigned ", dev->irq);

                ei_status.block_input = &ultra_pio_input;

                ei_status.block_output = &ultra_pio_output;

                ei_status.get_8390_hdr = &ultra_pio_get_hdr;

        } else {

                printk(",%s IRQ %d memory %#lx-%#lx.\n", eeprom_irq ? "" : "assigned ",

                           dev->irq, dev->mem_start, dev->mem_end-1);

                ei_status.block_input = &ultra_block_input;

                ei_status.block_output = &ultra_block_output;

                ei_status.get_8390_hdr = &ultra_get_8390_hdr;

        }

        ei_status.reset_8390 = &ultra_reset_8390;

        dev->open = &ultra_open;

        dev->stop = &ultra_close_card;

        NS8390_init(dev, 0);

        return 0;

}

static int

ultra_open(struct device *dev)

{

        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC addr */

        unsigned char irq2reg[] = {0, 0, 0x04, 0x08, 0, 0x0C, 0, 0x40,

                                                           0, 0x04, 0x44, 0x48, 0, 0, 0, 0x4C, };

        if (request_irq(dev->irq, ei_interrupt, 0, ei_status.name, dev))

                return -EAGAIN;

        outb(0x00, ioaddr);     /* Disable shared memory for safety. */

        outb(0x80, ioaddr + 5);

        /* Set the IRQ line. */

        outb(inb(ioaddr + 4) | 0x80, ioaddr + 4);

        outb((inb(ioaddr + 13) & ~0x4C) | irq2reg[dev->irq], ioaddr + 13);

        outb(inb(ioaddr + 4) & 0x7f, ioaddr + 4);

        if (ei_status.block_input == &ultra_pio_input) {

                outb(0x11, ioaddr + 6);         /* Enable interrupts and PIO. */

                outb(0x01, ioaddr + 0x19);      /* Enable ring read auto-wrap. */

        } else

                outb(0x01, ioaddr + 6);         /* Enable interrupts and memory. */

        /* Set the early receive warning level in window 0 high enough not

           to receive ERW interrupts. */

        outb_p(E8390_NODMA+E8390_PAGE0, dev->base_addr);

        outb(0xff, dev->base_addr + EN0_ERWCNT);

        ei_open(dev);

        MOD_INC_USE_COUNT;

        return 0;

}

static void

ultra_reset_8390(struct device *dev)

{

        int cmd_port = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC base addr */

        outb(ULTRA_RESET, cmd_port);

        if (ei_debug > 1) printk("resetting Ultra, t=%ld...", jiffies);

        ei_status.txing = 0;

        outb(0x00, cmd_port);   /* Disable shared memory for safety. */

        outb(0x80, cmd_port + 5);

        if (ei_status.block_input == &ultra_pio_input)

                outb(0x11, cmd_port + 6);               /* Enable interrupts and PIO. */

        else

                outb(0x01, cmd_port + 6);               /* Enable interrupts and memory. */

        if (ei_debug > 1) printk("reset done\n");

        return;

}

/* Grab the 8390 specific header. Similar to the block_input routine, but

   we don't need to be concerned with ring wrap as the header will be at

   the start of a page, so we optimize accordingly. */

static void

ultra_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)

{

        unsigned long hdr_start = dev->mem_start + ((ring_page - START_PG)<<8);

        outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);  /* shmem on */

#ifdef notdef

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

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

#else

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

#endif

        outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET); /* shmem off */

}

/* Block input and output are easy on shared memory ethercards, the only

   complication is when the ring buffer wraps. */

static void

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

{

        unsigned long xfer_start = dev->mem_start + ring_offset - (START_PG<<8);

        /* Enable shared memory. */

        outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);

        if (xfer_start + count > dev->rmem_end) {

                /* We must wrap the input move. */

                int semi_count = dev->rmem_end - xfer_start;

                memcpy_fromio(skb->data, xfer_start, semi_count);

                count -= semi_count;

                memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);

        } else {

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

                eth_io_copy_and_sum(skb, xfer_start, count, 0);

        }

        outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET);  /* Disable memory. */

}

static void

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

                                int start_page)

{

        unsigned long shmem = dev->mem_start + ((start_page - START_PG)<<8);

        /* Enable shared memory. */

        outb(ULTRA_MEMENB, dev->base_addr - ULTRA_NIC_OFFSET);

        memcpy_toio(shmem, buf, count);

        outb(0x00, dev->base_addr - ULTRA_NIC_OFFSET); /* Disable memory. */

}

/* The identical operations for programmed I/O cards.

   The PIO model is trivial to use: the 16 bit start address is written

   byte-sequentially to IOPA, with no intervening I/O operations, and the

   data is read or written to the IOPD data port.

   The only potential complication is that the address register is shared

   and must be always be rewritten between each read/write direction change.

   This is no problem for us, as the 8390 code ensures that we are single

   threaded. */

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

                                                int ring_page)

{

        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC addr */

        outb(0x00, ioaddr + IOPA);      /* Set the address, LSB first. */

        outb(ring_page, ioaddr + IOPA);

        insw(ioaddr + IOPD, hdr, sizeof(struct e8390_pkt_hdr)>>1);

}

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

                                                  struct sk_buff *skb, int ring_offset)

{

        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC addr */

    char *buf = skb->data;

        /* For now set the address again, although it should already be correct. */

        outb(ring_offset, ioaddr + IOPA);       /* Set the address, LSB first. */

        outb(ring_offset >> 8, ioaddr + IOPA);

        /* We know skbuffs are padded to at least word alignment. */

        insw(ioaddr + IOPD, buf, (count+1)>>1);

}

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

                                                        const unsigned char *buf, const int start_page)

{

        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* ASIC addr */

        outb(0x00, ioaddr + IOPA);      /* Set the address, LSB first. */

        outb(start_page, ioaddr + IOPA);

        /* An extra odd byte is OK here as well. */

        outsw(ioaddr + IOPD, buf, (count+1)>>1);

}

static int

ultra_close_card(struct device *dev)

{

        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET; /* CMDREG */

        dev->start = 0;

        dev->tbusy = 1;

        if (ei_debug > 1)

                printk("%s: Shutting down ethercard.\n", dev->name);

        outb(0x00, ioaddr + 6);         /* Disable interrupts. */

        free_irq(dev->irq, dev);

        irq2dev_map[dev->irq] = 0;

        NS8390_init(dev, 0);

        /* We should someday disable shared memory and change to 8-bit mode

           "just in case"... */

        MOD_DEC_USE_COUNT;

        return 0;

}

#ifdef MODULE

#define MAX_ULTRA_CARDS 4       /* Max number of Ultra cards per module */

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

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

static struct device dev_ultra[MAX_ULTRA_CARDS] = {

        {

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

                0, 0, 0, 0,

                0, 0,

                0, 0, 0, NULL, NULL

        },

};

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

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

/* 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_ULTRA_CARDS; this_dev++) {

                struct device *dev = &dev_ultra[this_dev];

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

                dev->irq = irq[this_dev];

                dev->base_addr = io[this_dev];

                dev->init = ultra_probe;

                if (io[this_dev] == 0)  {

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

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

                }

                if (register_netdev(dev) != 0) {

                        printk(KERN_WARNING "smc-ultra.c: No SMC Ultra 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_ULTRA_CARDS; this_dev++) {

                struct device *dev = &dev_ultra[this_dev];

                if (dev->priv != NULL) {

                        /* NB: ultra_close_card() does free_irq + irq2dev */

                        int ioaddr = dev->base_addr - ULTRA_NIC_OFFSET;

                        kfree(dev->priv);

                        dev->priv = NULL;

                        release_region(ioaddr, ULTRA_IO_EXTENT);

                        unregister_netdev(dev);

                }

        }

}

#endif /* MODULE */

/*

 * Local variables:

 *  compile-command: "gcc -D__KERNEL__ -Wall -O6 -I/usr/src/linux/net/inet -c smc-ultra.c"

 *  version-control: t

 *  kept-new-versions: 5

 *  c-indent-level: 4

 *  c-basic-offset: 4

 *  tab-width: 4

 * End:

 */