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