com90xx.c
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上传日期:2013-04-10
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- /*
- * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
- *
- * Written 1994-1999 by Avery Pennarun.
- * Written 1999 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/module.h>
- #include <linux/init.h>
- #include <linux/ioport.h>
- #include <linux/delay.h>
- #include <linux/netdevice.h>
- #include <linux/bootmem.h>
- #include <asm/io.h>
- #include <linux/arcdevice.h>
- #define VERSION "arcnet: COM90xx chipset supportn"
- /* Define this to speed up the autoprobe by assuming if only one io port and
- * shmem are left in the list at Stage 5, they must correspond to each
- * other.
- *
- * This is undefined by default because it might not always be true, and the
- * extra check makes the autoprobe even more careful. Speed demons can turn
- * it on - I think it should be fine if you only have one ARCnet card
- * installed.
- *
- * If no ARCnet cards are installed, this delay never happens anyway and thus
- * the option has no effect.
- */
- #undef FAST_PROBE
- /* Internal function declarations */
- static int com90xx_found(struct net_device *dev, int ioaddr, int airq,
- u_long shmem);
- static void com90xx_command(struct net_device *dev, int command);
- static int com90xx_status(struct net_device *dev);
- static void com90xx_setmask(struct net_device *dev, int mask);
- static int com90xx_reset(struct net_device *dev, int really_reset);
- static void com90xx_openclose(struct net_device *dev, bool open);
- static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
- void *buf, int count);
- static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
- void *buf, int count);
- /* Known ARCnet cards */
- static struct net_device *cards[16];
- static int numcards;
- /* Handy defines for ARCnet specific stuff */
- /* The number of low I/O ports used by the card */
- #define ARCNET_TOTAL_SIZE 16
- /* Amount of I/O memory used by the card */
- #define BUFFER_SIZE (512)
- #define MIRROR_SIZE (BUFFER_SIZE*4)
- /* 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 _CONFIG (ioaddr+2) /* Configuration register */
- #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)
- #undef ASTATUS
- #undef ACOMMAND
- #undef AINTMASK
- #define ASTATUS() inb(_STATUS)
- #define ACOMMAND(cmd) outb((cmd),_COMMAND)
- #define AINTMASK(msk) outb((msk),_INTMASK)
- static int com90xx_skip_probe __initdata = 0;
- int __init com90xx_probe(struct net_device *dev)
- {
- int count, status, ioaddr, numprint, airq, retval = -ENODEV,
- openparen = 0;
- unsigned long airqmask;
- int ports[(0x3f0 - 0x200) / 16 + 1] =
- {0};
- u_long shmems[(0xFF800 - 0xA0000) / 2048 + 1] =
- {0};
- int numports, numshmems, *port;
- u_long *shmem;
- if (!dev && com90xx_skip_probe)
- return -ENODEV;
- #ifndef MODULE
- arcnet_init();
- #endif
- BUGLVL(D_NORMAL) printk(VERSION);
- /* set up the arrays where we'll store the possible probe addresses */
- numports = numshmems = 0;
- if (dev && dev->base_addr)
- ports[numports++] = dev->base_addr;
- else
- for (count = 0x200; count <= 0x3f0; count += 16)
- ports[numports++] = count;
- if (dev && dev->mem_start)
- shmems[numshmems++] = dev->mem_start;
- else
- for (count = 0xA0000; count <= 0xFF800; count += 2048)
- shmems[numshmems++] = count;
- /* Stage 1: abandon any reserved ports, or ones with status==0xFF
- * (empty), and reset any others by reading the reset port.
- */
- numprint = -1;
- for (port = &ports[0]; port - ports < numports; port++) {
- numprint++;
- numprint %= 8;
- if (!numprint) {
- BUGMSG2(D_INIT, "n");
- BUGMSG2(D_INIT, "S1: ");
- }
- BUGMSG2(D_INIT, "%Xh ", *port);
- ioaddr = *port;
- if (check_region(*port, ARCNET_TOTAL_SIZE)) {
- BUGMSG2(D_INIT_REASONS, "(check_region)n");
- BUGMSG2(D_INIT_REASONS, "S1: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *port = ports[numports - 1];
- numports--;
- port--;
- continue;
- }
- if (ASTATUS() == 0xFF) {
- BUGMSG2(D_INIT_REASONS, "(empty)n");
- BUGMSG2(D_INIT_REASONS, "S1: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *port = ports[numports - 1];
- numports--;
- port--;
- continue;
- }
- inb(_RESET); /* begin resetting card */
- BUGMSG2(D_INIT_REASONS, "n");
- BUGMSG2(D_INIT_REASONS, "S1: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- }
- BUGMSG2(D_INIT, "n");
- if (!numports) {
- BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.n");
- return -ENODEV;
- }
- /* Stage 2: we have now reset any possible ARCnet cards, so we can't
- * do anything until they finish. If D_INIT, print the list of
- * cards that are left.
- */
- numprint = -1;
- for (port = &ports[0]; port - ports < numports; port++) {
- numprint++;
- numprint %= 8;
- if (!numprint) {
- BUGMSG2(D_INIT, "n");
- BUGMSG2(D_INIT, "S2: ");
- }
- BUGMSG2(D_INIT, "%Xh ", *port);
- }
- BUGMSG2(D_INIT, "n");
- mdelay(RESETtime);
- /* Stage 3: abandon any shmem addresses that don't have the signature
- * 0xD1 byte in the right place, or are read-only.
- */
- numprint = -1;
- for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
- u_long ptr = *shmem;
- numprint++;
- numprint %= 8;
- if (!numprint) {
- BUGMSG2(D_INIT, "n");
- BUGMSG2(D_INIT, "S3: ");
- }
- BUGMSG2(D_INIT, "%lXh ", *shmem);
- if (check_mem_region(*shmem, BUFFER_SIZE)) {
- BUGMSG2(D_INIT_REASONS, "(check_mem_region)n");
- BUGMSG2(D_INIT_REASONS, "Stage 3: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *shmem = shmems[numshmems - 1];
- numshmems--;
- shmem--;
- continue;
- }
- if (isa_readb(ptr) != TESTvalue) {
- BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)n",
- isa_readb(ptr), TESTvalue);
- BUGMSG2(D_INIT_REASONS, "S3: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *shmem = shmems[numshmems - 1];
- numshmems--;
- shmem--;
- continue;
- }
- /* By writing 0x42 to the TESTvalue location, we also make
- * sure no "mirror" shmem areas show up - if they occur
- * in another pass through this loop, they will be discarded
- * because *cptr != TESTvalue.
- */
- isa_writeb(0x42, ptr);
- if (isa_readb(ptr) != 0x42) {
- BUGMSG2(D_INIT_REASONS, "(read only)n");
- BUGMSG2(D_INIT_REASONS, "S3: ");
- *shmem = shmems[numshmems - 1];
- numshmems--;
- shmem--;
- continue;
- }
- BUGMSG2(D_INIT_REASONS, "n");
- BUGMSG2(D_INIT_REASONS, "S3: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- }
- BUGMSG2(D_INIT, "n");
- if (!numshmems) {
- BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.n");
- return -ENODEV;
- }
- /* Stage 4: something of a dummy, to report the shmems that are
- * still possible after stage 3.
- */
- numprint = -1;
- for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
- numprint++;
- numprint %= 8;
- if (!numprint) {
- BUGMSG2(D_INIT, "n");
- BUGMSG2(D_INIT, "S4: ");
- }
- BUGMSG2(D_INIT, "%lXh ", *shmem);
- }
- BUGMSG2(D_INIT, "n");
- /* Stage 5: for any ports that have the correct status, can disable
- * the RESET flag, and (if no irq is given) generate an autoirq,
- * register an ARCnet device.
- *
- * Currently, we can only register one device per probe, so quit
- * after the first one is found.
- */
- numprint = -1;
- for (port = &ports[0]; port - ports < numports; port++) {
- numprint++;
- numprint %= 8;
- if (!numprint) {
- BUGMSG2(D_INIT, "n");
- BUGMSG2(D_INIT, "S5: ");
- }
- BUGMSG2(D_INIT, "%Xh ", *port);
- ioaddr = *port;
- status = ASTATUS();
- if ((status & 0x9D)
- != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
- BUGMSG2(D_INIT_REASONS, "(status=%Xh)n", status);
- BUGMSG2(D_INIT_REASONS, "S5: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *port = ports[numports - 1];
- numports--;
- port--;
- continue;
- }
- ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
- status = ASTATUS();
- if (status & RESETflag) {
- BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)n",
- status);
- BUGMSG2(D_INIT_REASONS, "S5: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *port = ports[numports - 1];
- numports--;
- port--;
- continue;
- }
- /* skip this completely if an IRQ was given, because maybe
- * we're on a machine that locks during autoirq!
- */
- if (!dev || !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();
- AINTMASK(NORXflag);
- udelay(1);
- AINTMASK(0);
- airq = probe_irq_off(airqmask);
- if (airq <= 0) {
- BUGMSG2(D_INIT_REASONS, "(airq=%d)n", airq);
- BUGMSG2(D_INIT_REASONS, "S5: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- *port = ports[numports - 1];
- numports--;
- port--;
- continue;
- }
- } else {
- airq = dev->irq;
- }
- BUGMSG2(D_INIT, "(%d,", airq);
- openparen = 1;
- /* Everything seems okay. But which shmem, if any, puts
- * back its signature byte when the card is reset?
- *
- * If there are multiple cards installed, there might be
- * multiple shmems still in the list.
- */
- #ifdef FAST_PROBE
- if (numports > 1 || numshmems > 1) {
- inb(_RESET);
- mdelay(RESETtime);
- } else {
- /* just one shmem and port, assume they match */
- isa_writeb(TESTvalue, shmems[0]);
- }
- #else
- inb(_RESET);
- mdelay(RESETtime);
- #endif
- for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
- u_long ptr = *shmem;
- if (isa_readb(ptr) == TESTvalue) { /* found one */
- BUGMSG2(D_INIT, "%lXh)n", *shmem);
- openparen = 0;
- /* register the card */
- retval = com90xx_found(dev, *port, airq, *shmem);
- numprint = -1;
- /* remove shmem from the list */
- *shmem = shmems[numshmems - 1];
- numshmems--;
- break; /* go to the next I/O port */
- } else {
- BUGMSG2(D_INIT_REASONS, "%Xh-", isa_readb(ptr));
- }
- }
- if (openparen) {
- BUGLVL(D_INIT) printk("no matching shmem)n");
- BUGLVL(D_INIT_REASONS) printk("S5: ");
- BUGLVL(D_INIT_REASONS) numprint = 0;
- }
- *port = ports[numports - 1];
- numports--;
- port--;
- }
- BUGLVL(D_INIT_REASONS) printk("n");
- /* Now put back TESTvalue on all leftover shmems. */
- for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++)
- isa_writeb(TESTvalue, *shmem);
- if (retval && dev && !numcards)
- BUGMSG2(D_NORMAL, "S5: No ARCnet cards found.n");
- return retval;
- }
- /* Set up the struct net_device associated with this card. Called after
- * probing succeeds.
- */
- static int __init com90xx_found(struct net_device *dev0, int ioaddr, int airq,
- u_long shmem)
- {
- struct net_device *dev = dev0;
- struct arcnet_local *lp;
- u_long first_mirror, last_mirror;
- int mirror_size, err;
- /* allocate struct net_device if we don't have one yet */
- if (!dev && !(dev = dev_alloc("arc%d", &err))) {
- BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!n");
- return err;
- }
- lp = dev->priv = kmalloc(sizeof(struct arcnet_local), GFP_KERNEL);
- if (!lp) {
- BUGMSG(D_NORMAL, "Can't allocate device data!n");
- goto err_free_dev;
- }
- /* find the real shared memory start/end points, including mirrors */
- /* guess the actual size of one "memory mirror" - the number of
- * bytes between copies of the shared memory. On most cards, it's
- * 2k (or there are no mirrors at all) but on some, it's 4k.
- */
- mirror_size = MIRROR_SIZE;
- if (isa_readb(shmem) == TESTvalue
- && isa_readb(shmem - mirror_size) != TESTvalue
- && isa_readb(shmem - 2 * mirror_size) == TESTvalue)
- mirror_size *= 2;
- first_mirror = last_mirror = shmem;
- while (isa_readb(first_mirror) == TESTvalue)
- first_mirror -= mirror_size;
- first_mirror += mirror_size;
- while (isa_readb(last_mirror) == TESTvalue)
- last_mirror += mirror_size;
- last_mirror -= mirror_size;
- dev->mem_start = first_mirror;
- dev->mem_end = last_mirror + MIRROR_SIZE - 1;
- dev->rmem_start = dev->mem_start + BUFFER_SIZE * 0;
- dev->rmem_end = dev->mem_start + BUFFER_SIZE * 2 - 1;
- /* Initialize the rest of the device structure. */
- memset(lp, 0, sizeof(struct arcnet_local));
- lp->card_name = "COM90xx";
- lp->hw.command = com90xx_command;
- lp->hw.status = com90xx_status;
- lp->hw.intmask = com90xx_setmask;
- lp->hw.reset = com90xx_reset;
- lp->hw.open_close = com90xx_openclose;
- lp->hw.copy_to_card = com90xx_copy_to_card;
- lp->hw.copy_from_card = com90xx_copy_from_card;
- lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
- if (!lp->mem_start) {
- BUGMSG(D_NORMAL, "Can't remap device memory!n");
- goto err_free_dev_priv;
- }
- /* Fill in the fields of the device structure with generic values. */
- arcdev_setup(dev);
- /* get and check the station ID from offset 1 in shmem */
- dev->dev_addr[0] = readb(lp->mem_start + 1);
- /* reserve the irq */
- if (request_irq(airq, &arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
- BUGMSG(D_NORMAL, "Can't get IRQ %d!n", airq);
- goto err_unmap;
- }
- dev->irq = airq;
- /* reserve the I/O and memory regions - guaranteed to work by check_region */
- request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (90xx)");
- request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)");
- dev->base_addr = ioaddr;
- BUGMSG(D_NORMAL, "COM90xx station %02Xh found at %03lXh, IRQ %d, "
- "ShMem %lXh (%ld*%xh).n",
- dev->dev_addr[0],
- dev->base_addr, dev->irq, dev->mem_start,
- (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
- if (!dev0 && register_netdev(dev))
- goto err_release;
- cards[numcards++] = dev;
- return 0;
- err_release:
- free_irq(dev->irq, dev);
- release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
- release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
- err_unmap:
- iounmap(lp->mem_start);
- err_free_dev_priv:
- kfree(dev->priv);
- err_free_dev:
- if (!dev0)
- kfree(dev);
- return -EIO;
- }
- static void com90xx_command(struct net_device *dev, int cmd)
- {
- short ioaddr = dev->base_addr;
- ACOMMAND(cmd);
- }
- static int com90xx_status(struct net_device *dev)
- {
- short ioaddr = dev->base_addr;
- return ASTATUS();
- }
- static void com90xx_setmask(struct net_device *dev, int mask)
- {
- short ioaddr = dev->base_addr;
- AINTMASK(mask);
- }
- /*
- * 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.
- */
- int com90xx_reset(struct net_device *dev, int really_reset)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- short ioaddr = dev->base_addr;
- BUGMSG(D_INIT, "Resetting (status=%02Xh)n", ASTATUS());
- if (really_reset) {
- /* reset the card */
- inb(_RESET);
- mdelay(RESETtime);
- }
- ACOMMAND(CFLAGScmd | RESETclear); /* clear flags & end reset */
- ACOMMAND(CFLAGScmd | CONFIGclear);
- /* don't do this until we verify that it doesn't hurt older cards! */
- /* outb(inb(_CONFIG) | ENABLE16flag, _CONFIG); */
- /* verify that the ARCnet signature byte is present */
- if (readb(lp->mem_start) != TESTvalue) {
- if (really_reset)
- BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.n");
- return 1;
- }
- /* enable extended (512-byte) packets */
- ACOMMAND(CONFIGcmd | EXTconf);
- /* clean out all the memory to make debugging make more sense :) */
- BUGLVL(D_DURING)
- memset_io(lp->mem_start, 0x42, 2048);
- /* done! return success. */
- return 0;
- }
- static void com90xx_openclose(struct net_device *dev, bool open)
- {
- if (open)
- MOD_INC_USE_COUNT;
- else
- MOD_DEC_USE_COUNT;
- }
- static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
- void *buf, int count)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- void *memaddr = lp->mem_start + bufnum * 512 + offset;
- TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
- }
- static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
- void *buf, int count)
- {
- struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
- void *memaddr = lp->mem_start + bufnum * 512 + offset;
- TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
- }
- #ifdef MODULE
- /* Module parameters */
- static int io; /* use the insmod io= irq= shmem= options */
- static int irq;
- static int shmem;
- static char *device; /* use eg. device=arc1 to change name */
- MODULE_PARM(io, "i");
- MODULE_PARM(irq, "i");
- MODULE_PARM(shmem, "i");
- MODULE_PARM(device, "s");
- MODULE_LICENSE("GPL");
- int init_module(void)
- {
- struct net_device *dev;
- int err;
- if (io || irq || shmem || device) {
- dev = dev_alloc(device ? : "arc%d", &err);
- if (!dev)
- return err;
- dev->base_addr = io;
- dev->irq = irq;
- if (dev->irq == 2)
- dev->irq = 9;
- dev->mem_start = shmem;
- com90xx_probe(dev);
- } else
- com90xx_probe(NULL);
- if (!numcards)
- return -EIO;
- return 0;
- }
- void cleanup_module(void)
- {
- struct net_device *dev;
- struct arcnet_local *lp;
- int count;
- for (count = 0; count < numcards; count++) {
- dev = cards[count];
- lp = (struct arcnet_local *) dev->priv;
- unregister_netdev(dev);
- free_irq(dev->irq, dev);
- iounmap(lp->mem_start);
- release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
- release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
- kfree(dev->priv);
- kfree(dev);
- }
- }
- #else
- static int __init com90xx_setup(char *s)
- {
- struct net_device *dev;
- int ints[8];
- com90xx_skip_probe = 1;
- s = get_options(s, 8, ints);
- if (!ints[0] && !*s) {
- printk("com90xx: Disabled.n");
- return 1;
- }
- dev = alloc_bootmem(sizeof(struct net_device));
- memset(dev, 0, sizeof(struct net_device));
- dev->init = com90xx_probe;
- switch (ints[0]) {
- default: /* ERROR */
- printk("com90xx: Too many arguments.n");
- case 3: /* Mem address */
- dev->mem_start = ints[3];
- case 2: /* IRQ */
- dev->irq = ints[2];
- case 1: /* IO address */
- dev->base_addr = ints[1];
- }
- if (*s)
- strncpy(dev->name, s, 9);
- else
- strcpy(dev->name, "arc%d");
- if (register_netdev(dev))
- printk(KERN_ERR "com90xx: Cannot register arcnet devicen");
- return 1;
- }
- __setup("com90xx=", com90xx_setup);
- #endif /* MODULE */