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path: root/drivers/net/arcnet/com90xx.c
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Diffstat (limited to 'drivers/net/arcnet/com90xx.c')
-rw-r--r--drivers/net/arcnet/com90xx.c646
1 files changed, 646 insertions, 0 deletions
diff --git a/drivers/net/arcnet/com90xx.c b/drivers/net/arcnet/com90xx.c
new file mode 100644
index 000000000000..6c2c9b9ac6db
--- /dev/null
+++ b/drivers/net/arcnet/com90xx.c
@@ -0,0 +1,646 @@
+/*
+ * 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/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <asm/io.h>
+#include <linux/arcdevice.h>
+
+
+#define VERSION "arcnet: COM90xx chipset support\n"
+
+
+/* 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(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_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;
+
+/* Module parameters */
+
+static int io; /* use the insmod io= irq= shmem= options */
+static int irq;
+static int shmem;
+static char device[9]; /* use eg. device=arc1 to change name */
+
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(shmem, int, 0);
+module_param_string(device, device, sizeof(device), 0);
+
+static void __init com90xx_probe(void)
+{
+ int count, status, ioaddr, numprint, airq, 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 *p;
+
+ if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
+ return;
+
+ BUGLVL(D_NORMAL) printk(VERSION);
+
+ /* set up the arrays where we'll store the possible probe addresses */
+ numports = numshmems = 0;
+ if (io)
+ ports[numports++] = io;
+ else
+ for (count = 0x200; count <= 0x3f0; count += 16)
+ ports[numports++] = count;
+ if (shmem)
+ shmems[numshmems++] = shmem;
+ 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 (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
+ BUGMSG2(D_INIT_REASONS, "(request_region)\n");
+ BUGMSG2(D_INIT_REASONS, "S1: ");
+ BUGLVL(D_INIT_REASONS) numprint = 0;
+ *port-- = ports[--numports];
+ continue;
+ }
+ if (ASTATUS() == 0xFF) {
+ BUGMSG2(D_INIT_REASONS, "(empty)\n");
+ BUGMSG2(D_INIT_REASONS, "S1: ");
+ BUGLVL(D_INIT_REASONS) numprint = 0;
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ *port-- = ports[--numports];
+ 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;
+ }
+ /* 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 (p = &shmems[0]; p < shmems + numshmems; p++) {
+ u_long ptr = *p;
+
+ numprint++;
+ numprint %= 8;
+ if (!numprint) {
+ BUGMSG2(D_INIT, "\n");
+ BUGMSG2(D_INIT, "S3: ");
+ }
+ BUGMSG2(D_INIT, "%lXh ", *p);
+
+ if (!request_mem_region(*p, BUFFER_SIZE, "arcnet (90xx)")) {
+ BUGMSG2(D_INIT_REASONS, "(request_mem_region)\n");
+ BUGMSG2(D_INIT_REASONS, "Stage 3: ");
+ BUGLVL(D_INIT_REASONS) numprint = 0;
+ *p-- = shmems[--numshmems];
+ 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;
+ release_mem_region(*p, BUFFER_SIZE);
+ *p-- = shmems[--numshmems];
+ 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: ");
+ release_mem_region(*p, BUFFER_SIZE);
+ *p-- = shmems[--numshmems];
+ 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");
+ for (port = &ports[0]; port < ports + numports; port++)
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ return;
+ }
+ /* Stage 4: something of a dummy, to report the shmems that are
+ * still possible after stage 3.
+ */
+ numprint = -1;
+ for (p = &shmems[0]; p < shmems + numshmems; p++) {
+ numprint++;
+ numprint %= 8;
+ if (!numprint) {
+ BUGMSG2(D_INIT, "\n");
+ BUGMSG2(D_INIT, "S4: ");
+ }
+ BUGMSG2(D_INIT, "%lXh ", *p);
+ }
+ 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++) {
+ int found = 0;
+ 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;
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ *port-- = ports[--numports];
+ 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;
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ *port-- = ports[--numports];
+ continue;
+ }
+ /* skip this completely if an IRQ was given, because maybe
+ * we're on a machine that locks during autoirq!
+ */
+ if (!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;
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ *port-- = ports[--numports];
+ continue;
+ }
+ } else {
+ airq = 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 (p = &shmems[0]; p < shmems + numshmems; p++) {
+ u_long ptr = *p;
+
+ if (isa_readb(ptr) == TESTvalue) { /* found one */
+ BUGMSG2(D_INIT, "%lXh)\n", *p);
+ openparen = 0;
+
+ /* register the card */
+ if (com90xx_found(*port, airq, *p) == 0)
+ found = 1;
+ numprint = -1;
+
+ /* remove shmem from the list */
+ *p = shmems[--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;
+ }
+ if (!found)
+ release_region(*port, ARCNET_TOTAL_SIZE);
+ *port-- = ports[--numports];
+ }
+
+ BUGLVL(D_INIT_REASONS) printk("\n");
+
+ /* Now put back TESTvalue on all leftover shmems. */
+ for (p = &shmems[0]; p < shmems + numshmems; p++) {
+ isa_writeb(TESTvalue, *p);
+ release_mem_region(*p, BUFFER_SIZE);
+ }
+}
+
+
+/* Set up the struct net_device associated with this card. Called after
+ * probing succeeds.
+ */
+static int __init com90xx_found(int ioaddr, int airq, u_long shmem)
+{
+ struct net_device *dev = NULL;
+ struct arcnet_local *lp;
+ u_long first_mirror, last_mirror;
+ int mirror_size;
+
+ /* allocate struct net_device */
+ dev = alloc_arcdev(device);
+ if (!dev) {
+ BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!\n");
+ release_mem_region(shmem, BUFFER_SIZE);
+ return -ENOMEM;
+ }
+ lp = dev->priv;
+ /* 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;
+
+ release_mem_region(shmem, BUFFER_SIZE);
+ if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
+ goto err_free_dev;
+
+ /* 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_release_mem;
+ }
+ dev->irq = airq;
+
+ /* Initialize the rest of the device structure. */
+ 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.owner = THIS_MODULE;
+ 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_irq;
+ }
+
+ /* get and check the station ID from offset 1 in shmem */
+ dev->dev_addr[0] = readb(lp->mem_start + 1);
+
+ 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 (register_netdev(dev))
+ goto err_unmap;
+
+ cards[numcards++] = dev;
+ return 0;
+
+err_unmap:
+ iounmap(lp->mem_start);
+err_free_irq:
+ free_irq(dev->irq, dev);
+err_release_mem:
+ release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
+err_free_dev:
+ free_netdev(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 = 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_copy_to_card(struct net_device *dev, int bufnum, int offset,
+ void *buf, int count)
+{
+ struct arcnet_local *lp = dev->priv;
+ void __iomem *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 = dev->priv;
+ void __iomem *memaddr = lp->mem_start + bufnum * 512 + offset;
+ TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
+}
+
+
+MODULE_LICENSE("GPL");
+
+static int __init com90xx_init(void)
+{
+ if (irq == 2)
+ irq = 9;
+ com90xx_probe();
+ if (!numcards)
+ return -EIO;
+ return 0;
+}
+
+static void __exit com90xx_exit(void)
+{
+ struct net_device *dev;
+ struct arcnet_local *lp;
+ int count;
+
+ for (count = 0; count < numcards; count++) {
+ dev = cards[count];
+ lp = 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);
+ free_netdev(dev);
+ }
+}
+
+module_init(com90xx_init);
+module_exit(com90xx_exit);
+
+#ifndef MODULE
+static int __init com90xx_setup(char *s)
+{
+ int ints[8];
+
+ s = get_options(s, 8, ints);
+ if (!ints[0] && !*s) {
+ printk("com90xx: Disabled.\n");
+ return 1;
+ }
+
+ switch (ints[0]) {
+ default: /* ERROR */
+ printk("com90xx: Too many arguments.\n");
+ case 3: /* Mem address */
+ shmem = ints[3];
+ case 2: /* IRQ */
+ irq = ints[2];
+ case 1: /* IO address */
+ io = ints[1];
+ }
+
+ if (*s)
+ snprintf(device, sizeof(device), "%s", s);
+
+ return 1;
+}
+
+__setup("com90xx=", com90xx_setup);
+#endif
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