436 lines
11 KiB
C
436 lines
11 KiB
C
/*
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* Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
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*
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* Written 1997 by David Woodhouse.
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* Written 1994-1999 by Avery Pennarun.
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* Written 1999-2000 by Martin Mares <mj@ucw.cz>.
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* Derived from skeleton.c by Donald Becker.
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*
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
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* for sponsoring the further development of this driver.
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*
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* **********************
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*
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* The original copyright of skeleton.c was as follows:
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*
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* skeleton.c Written 1993 by Donald Becker.
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* Copyright 1993 United States Government as represented by the
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* Director, National Security Agency. This software may only be used
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* and distributed according to the terms of the GNU General Public License as
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* modified by SRC, incorporated herein by reference.
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*
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* **********************
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*
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* For more details, see drivers/net/arcnet.c
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*
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* **********************
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/bootmem.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/arcdevice.h>
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#define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"
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/* Internal function declarations */
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static int com90io_found(struct net_device *dev);
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static void com90io_command(struct net_device *dev, int command);
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static int com90io_status(struct net_device *dev);
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static void com90io_setmask(struct net_device *dev, int mask);
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static int com90io_reset(struct net_device *dev, int really_reset);
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static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count);
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static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count);
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/* Handy defines for ARCnet specific stuff */
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/* The number of low I/O ports used by the card. */
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#define ARCNET_TOTAL_SIZE 16
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/* COM 9026 controller chip --> ARCnet register addresses */
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#define _INTMASK (ioaddr+0) /* writable */
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#define _STATUS (ioaddr+0) /* readable */
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#define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */
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#define _RESET (ioaddr+8) /* software reset (on read) */
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#define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */
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#define _ADDR_HI (ioaddr+15) /* Control registers for said */
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#define _ADDR_LO (ioaddr+14)
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#define _CONFIG (ioaddr+2) /* Configuration register */
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#undef ASTATUS
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#undef ACOMMAND
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#undef AINTMASK
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#define ASTATUS() inb(_STATUS)
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#define ACOMMAND(cmd) outb((cmd),_COMMAND)
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#define AINTMASK(msk) outb((msk),_INTMASK)
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#define SETCONF() outb((lp->config),_CONFIG)
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/****************************************************************************
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* *
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* IO-mapped operation routines *
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* *
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****************************************************************************/
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#undef ONE_AT_A_TIME_TX
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#undef ONE_AT_A_TIME_RX
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static u_char get_buffer_byte(struct net_device *dev, unsigned offset)
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{
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int ioaddr = dev->base_addr;
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outb(offset >> 8, _ADDR_HI);
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outb(offset & 0xff, _ADDR_LO);
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return inb(_MEMDATA);
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}
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#ifdef ONE_AT_A_TIME_TX
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static void put_buffer_byte(struct net_device *dev, unsigned offset, u_char datum)
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{
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int ioaddr = dev->base_addr;
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outb(offset >> 8, _ADDR_HI);
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outb(offset & 0xff, _ADDR_LO);
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outb(datum, _MEMDATA);
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}
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#endif
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static void get_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
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{
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int ioaddr = dev->base_addr;
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outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
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outb(offset & 0xff, _ADDR_LO);
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while (length--)
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#ifdef ONE_AT_A_TIME_RX
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*(dest++) = get_buffer_byte(dev, offset++);
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#else
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*(dest++) = inb(_MEMDATA);
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#endif
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}
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static void put_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest)
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{
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int ioaddr = dev->base_addr;
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outb((offset >> 8) | AUTOINCflag, _ADDR_HI);
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outb(offset & 0xff, _ADDR_LO);
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while (length--)
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#ifdef ONE_AT_A_TIME_TX
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put_buffer_byte(dev, offset++, *(dest++));
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#else
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outb(*(dest++), _MEMDATA);
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#endif
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}
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/*
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* We cannot probe for an IO mapped card either, although we can check that
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* it's where we were told it was, and even autoirq
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*/
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static int __init com90io_probe(struct net_device *dev)
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{
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int ioaddr = dev->base_addr, status;
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unsigned long airqmask;
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BUGLVL(D_NORMAL) printk(VERSION);
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BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n");
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if (!ioaddr) {
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BUGMSG(D_NORMAL, "No autoprobe for IO mapped cards; you "
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"must specify the base address!\n");
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return -ENODEV;
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}
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if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) {
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BUGMSG(D_INIT_REASONS, "IO check_region %x-%x failed.\n",
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ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
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return -ENXIO;
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}
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if (ASTATUS() == 0xFF) {
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BUGMSG(D_INIT_REASONS, "IO address %x empty\n", ioaddr);
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goto err_out;
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}
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inb(_RESET);
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mdelay(RESETtime);
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status = ASTATUS();
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if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
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BUGMSG(D_INIT_REASONS, "Status invalid (%Xh).\n", status);
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goto err_out;
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}
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BUGMSG(D_INIT_REASONS, "Status after reset: %X\n", status);
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ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
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BUGMSG(D_INIT_REASONS, "Status after reset acknowledged: %X\n", status);
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status = ASTATUS();
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if (status & RESETflag) {
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BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status);
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goto err_out;
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}
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outb((0x16 | IOMAPflag) & ~ENABLE16flag, _CONFIG);
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/* Read first loc'n of memory */
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outb(AUTOINCflag, _ADDR_HI);
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outb(0, _ADDR_LO);
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if ((status = inb(_MEMDATA)) != 0xd1) {
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BUGMSG(D_INIT_REASONS, "Signature byte not found"
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" (%Xh instead).\n", status);
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goto err_out;
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}
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if (!dev->irq) {
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/*
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* if we do this, we're sure to get an IRQ since the
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* card has just reset and the NORXflag is on until
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* we tell it to start receiving.
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*/
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airqmask = probe_irq_on();
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outb(NORXflag, _INTMASK);
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udelay(1);
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outb(0, _INTMASK);
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dev->irq = probe_irq_off(airqmask);
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if (dev->irq <= 0) {
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BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed\n");
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goto err_out;
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}
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}
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release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */
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return com90io_found(dev);
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err_out:
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release_region(ioaddr, ARCNET_TOTAL_SIZE);
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return -ENODEV;
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}
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/* Set up the struct net_device associated with this card. Called after
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* probing succeeds.
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*/
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static int __init com90io_found(struct net_device *dev)
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{
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struct arcnet_local *lp;
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int ioaddr = dev->base_addr;
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int err;
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/* Reserve the irq */
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if (request_irq(dev->irq, &arcnet_interrupt, 0, "arcnet (COM90xx-IO)", dev)) {
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BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
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return -ENODEV;
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}
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/* Reserve the I/O region - guaranteed to work by check_region */
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if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)")) {
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free_irq(dev->irq, dev);
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return -EBUSY;
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}
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lp = dev->priv;
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lp->card_name = "COM90xx I/O";
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lp->hw.command = com90io_command;
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lp->hw.status = com90io_status;
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lp->hw.intmask = com90io_setmask;
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lp->hw.reset = com90io_reset;
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lp->hw.owner = THIS_MODULE;
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lp->hw.copy_to_card = com90io_copy_to_card;
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lp->hw.copy_from_card = com90io_copy_from_card;
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lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag;
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SETCONF();
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/* get and check the station ID from offset 1 in shmem */
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dev->dev_addr[0] = get_buffer_byte(dev, 1);
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err = register_netdev(dev);
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if (err) {
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outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
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free_irq(dev->irq, dev);
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release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
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return err;
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}
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BUGMSG(D_NORMAL, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
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dev->dev_addr[0], dev->base_addr, dev->irq);
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return 0;
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}
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/*
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* Do a hardware reset on the card, and set up necessary registers.
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*
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* This should be called as little as possible, because it disrupts the
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* token on the network (causes a RECON) and requires a significant delay.
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*
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* However, it does make sure the card is in a defined state.
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*/
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static int com90io_reset(struct net_device *dev, int really_reset)
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{
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struct arcnet_local *lp = dev->priv;
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short ioaddr = dev->base_addr;
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BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
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if (really_reset) {
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/* reset the card */
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inb(_RESET);
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mdelay(RESETtime);
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}
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/* Set the thing to IO-mapped, 8-bit mode */
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lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag;
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SETCONF();
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ACOMMAND(CFLAGScmd | RESETclear); /* clear flags & end reset */
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ACOMMAND(CFLAGScmd | CONFIGclear);
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/* verify that the ARCnet signature byte is present */
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if (get_buffer_byte(dev, 0) != TESTvalue) {
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BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
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return 1;
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}
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/* enable extended (512-byte) packets */
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ACOMMAND(CONFIGcmd | EXTconf);
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/* done! return success. */
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return 0;
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}
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static void com90io_command(struct net_device *dev, int cmd)
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{
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short ioaddr = dev->base_addr;
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ACOMMAND(cmd);
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}
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static int com90io_status(struct net_device *dev)
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{
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short ioaddr = dev->base_addr;
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return ASTATUS();
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}
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static void com90io_setmask(struct net_device *dev, int mask)
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{
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short ioaddr = dev->base_addr;
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AINTMASK(mask);
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}
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static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count)
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{
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TIME("put_whole_buffer", count, put_whole_buffer(dev, bufnum * 512 + offset, count, buf));
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}
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static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count)
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{
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TIME("get_whole_buffer", count, get_whole_buffer(dev, bufnum * 512 + offset, count, buf));
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}
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static int io; /* use the insmod io= irq= shmem= options */
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static int irq;
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static char device[9]; /* use eg. device=arc1 to change name */
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module_param(io, int, 0);
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module_param(irq, int, 0);
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module_param_string(device, device, sizeof(device), 0);
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MODULE_LICENSE("GPL");
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#ifndef MODULE
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static int __init com90io_setup(char *s)
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{
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int ints[4];
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s = get_options(s, 4, ints);
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if (!ints[0])
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return 0;
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switch (ints[0]) {
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default: /* ERROR */
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printk("com90io: Too many arguments.\n");
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case 2: /* IRQ */
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irq = ints[2];
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case 1: /* IO address */
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io = ints[1];
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}
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if (*s)
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snprintf(device, sizeof(device), "%s", s);
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return 1;
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}
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__setup("com90io=", com90io_setup);
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#endif
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static struct net_device *my_dev;
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static int __init com90io_init(void)
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{
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struct net_device *dev;
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int err;
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dev = alloc_arcdev(device);
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if (!dev)
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return -ENOMEM;
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SET_MODULE_OWNER(dev);
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dev->base_addr = io;
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dev->irq = irq;
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if (dev->irq == 2)
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dev->irq = 9;
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err = com90io_probe(dev);
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if (err) {
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free_netdev(dev);
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return err;
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}
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my_dev = dev;
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return 0;
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}
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static void __exit com90io_exit(void)
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{
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struct net_device *dev = my_dev;
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int ioaddr = dev->base_addr;
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unregister_netdev(dev);
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/* Set the thing back to MMAP mode, in case the old driver is loaded later */
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outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG);
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free_irq(dev->irq, dev);
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release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
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free_netdev(dev);
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}
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module_init(com90io_init)
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module_exit(com90io_exit)
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