![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
647 lines
17 KiB
C
647 lines
17 KiB
C
/*
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* Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
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*
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* Written 1994-1999 by Avery Pennarun.
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* Written 1999 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/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/netdevice.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 chipset support\n"
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/* Define this to speed up the autoprobe by assuming if only one io port and
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* shmem are left in the list at Stage 5, they must correspond to each
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* other.
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*
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* This is undefined by default because it might not always be true, and the
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* extra check makes the autoprobe even more careful. Speed demons can turn
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* it on - I think it should be fine if you only have one ARCnet card
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* installed.
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*
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* If no ARCnet cards are installed, this delay never happens anyway and thus
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* the option has no effect.
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*/
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#undef FAST_PROBE
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/* Internal function declarations */
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static int com90xx_found(int ioaddr, int airq, u_long shmem);
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static void com90xx_command(struct net_device *dev, int command);
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static int com90xx_status(struct net_device *dev);
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static void com90xx_setmask(struct net_device *dev, int mask);
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static int com90xx_reset(struct net_device *dev, int really_reset);
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static void com90xx_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 com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
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void *buf, int count);
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/* Known ARCnet cards */
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static struct net_device *cards[16];
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static int numcards;
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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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/* Amount of I/O memory used by the card */
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#define BUFFER_SIZE (512)
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#define MIRROR_SIZE (BUFFER_SIZE*4)
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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 _CONFIG (ioaddr+2) /* Configuration register */
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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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#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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static int com90xx_skip_probe __initdata = 0;
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/* Module parameters */
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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 int shmem;
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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(shmem, int, 0);
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module_param_string(device, device, sizeof(device), 0);
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static void __init com90xx_probe(void)
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{
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int count, status, ioaddr, numprint, airq, openparen = 0;
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unsigned long airqmask;
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int ports[(0x3f0 - 0x200) / 16 + 1] =
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{0};
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u_long shmems[(0xFF800 - 0xA0000) / 2048 + 1] =
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{0};
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int numports, numshmems, *port;
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u_long *p;
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if (!io && !irq && !shmem && !*device && com90xx_skip_probe)
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return;
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BUGLVL(D_NORMAL) printk(VERSION);
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/* set up the arrays where we'll store the possible probe addresses */
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numports = numshmems = 0;
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if (io)
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ports[numports++] = io;
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else
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for (count = 0x200; count <= 0x3f0; count += 16)
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ports[numports++] = count;
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if (shmem)
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shmems[numshmems++] = shmem;
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else
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for (count = 0xA0000; count <= 0xFF800; count += 2048)
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shmems[numshmems++] = count;
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/* Stage 1: abandon any reserved ports, or ones with status==0xFF
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* (empty), and reset any others by reading the reset port.
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*/
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numprint = -1;
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for (port = &ports[0]; port - ports < numports; port++) {
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numprint++;
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numprint %= 8;
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if (!numprint) {
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BUGMSG2(D_INIT, "\n");
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BUGMSG2(D_INIT, "S1: ");
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}
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BUGMSG2(D_INIT, "%Xh ", *port);
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ioaddr = *port;
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if (!request_region(*port, ARCNET_TOTAL_SIZE, "arcnet (90xx)")) {
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BUGMSG2(D_INIT_REASONS, "(request_region)\n");
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BUGMSG2(D_INIT_REASONS, "S1: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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*port-- = ports[--numports];
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continue;
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}
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if (ASTATUS() == 0xFF) {
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BUGMSG2(D_INIT_REASONS, "(empty)\n");
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BUGMSG2(D_INIT_REASONS, "S1: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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release_region(*port, ARCNET_TOTAL_SIZE);
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*port-- = ports[--numports];
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continue;
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}
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inb(_RESET); /* begin resetting card */
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BUGMSG2(D_INIT_REASONS, "\n");
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BUGMSG2(D_INIT_REASONS, "S1: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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}
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BUGMSG2(D_INIT, "\n");
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if (!numports) {
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BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.\n");
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return;
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}
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/* Stage 2: we have now reset any possible ARCnet cards, so we can't
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* do anything until they finish. If D_INIT, print the list of
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* cards that are left.
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*/
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numprint = -1;
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for (port = &ports[0]; port < ports + numports; port++) {
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numprint++;
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numprint %= 8;
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if (!numprint) {
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BUGMSG2(D_INIT, "\n");
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BUGMSG2(D_INIT, "S2: ");
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}
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BUGMSG2(D_INIT, "%Xh ", *port);
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}
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BUGMSG2(D_INIT, "\n");
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mdelay(RESETtime);
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/* Stage 3: abandon any shmem addresses that don't have the signature
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* 0xD1 byte in the right place, or are read-only.
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*/
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numprint = -1;
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for (p = &shmems[0]; p < shmems + numshmems; p++) {
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u_long ptr = *p;
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numprint++;
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numprint %= 8;
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if (!numprint) {
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BUGMSG2(D_INIT, "\n");
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BUGMSG2(D_INIT, "S3: ");
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}
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BUGMSG2(D_INIT, "%lXh ", *p);
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if (!request_mem_region(*p, BUFFER_SIZE, "arcnet (90xx)")) {
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BUGMSG2(D_INIT_REASONS, "(request_mem_region)\n");
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BUGMSG2(D_INIT_REASONS, "Stage 3: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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*p-- = shmems[--numshmems];
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continue;
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}
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if (isa_readb(ptr) != TESTvalue) {
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BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
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isa_readb(ptr), TESTvalue);
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BUGMSG2(D_INIT_REASONS, "S3: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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release_mem_region(*p, BUFFER_SIZE);
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*p-- = shmems[--numshmems];
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continue;
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}
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/* By writing 0x42 to the TESTvalue location, we also make
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* sure no "mirror" shmem areas show up - if they occur
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* in another pass through this loop, they will be discarded
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* because *cptr != TESTvalue.
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*/
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isa_writeb(0x42, ptr);
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if (isa_readb(ptr) != 0x42) {
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BUGMSG2(D_INIT_REASONS, "(read only)\n");
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BUGMSG2(D_INIT_REASONS, "S3: ");
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release_mem_region(*p, BUFFER_SIZE);
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*p-- = shmems[--numshmems];
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continue;
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}
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BUGMSG2(D_INIT_REASONS, "\n");
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BUGMSG2(D_INIT_REASONS, "S3: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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}
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BUGMSG2(D_INIT, "\n");
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if (!numshmems) {
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BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.\n");
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for (port = &ports[0]; port < ports + numports; port++)
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release_region(*port, ARCNET_TOTAL_SIZE);
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return;
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}
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/* Stage 4: something of a dummy, to report the shmems that are
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* still possible after stage 3.
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*/
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numprint = -1;
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for (p = &shmems[0]; p < shmems + numshmems; p++) {
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numprint++;
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numprint %= 8;
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if (!numprint) {
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BUGMSG2(D_INIT, "\n");
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BUGMSG2(D_INIT, "S4: ");
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}
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BUGMSG2(D_INIT, "%lXh ", *p);
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}
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BUGMSG2(D_INIT, "\n");
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/* Stage 5: for any ports that have the correct status, can disable
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* the RESET flag, and (if no irq is given) generate an autoirq,
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* register an ARCnet device.
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*
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* Currently, we can only register one device per probe, so quit
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* after the first one is found.
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*/
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numprint = -1;
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for (port = &ports[0]; port < ports + numports; port++) {
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int found = 0;
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numprint++;
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numprint %= 8;
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if (!numprint) {
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BUGMSG2(D_INIT, "\n");
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BUGMSG2(D_INIT, "S5: ");
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}
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BUGMSG2(D_INIT, "%Xh ", *port);
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ioaddr = *port;
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status = ASTATUS();
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if ((status & 0x9D)
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!= (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
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BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
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BUGMSG2(D_INIT_REASONS, "S5: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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release_region(*port, ARCNET_TOTAL_SIZE);
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*port-- = ports[--numports];
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continue;
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}
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ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
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status = ASTATUS();
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if (status & RESETflag) {
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BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
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status);
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BUGMSG2(D_INIT_REASONS, "S5: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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release_region(*port, ARCNET_TOTAL_SIZE);
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*port-- = ports[--numports];
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continue;
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}
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/* skip this completely if an IRQ was given, because maybe
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* we're on a machine that locks during autoirq!
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*/
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if (!irq) {
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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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AINTMASK(NORXflag);
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udelay(1);
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AINTMASK(0);
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airq = probe_irq_off(airqmask);
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if (airq <= 0) {
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BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
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BUGMSG2(D_INIT_REASONS, "S5: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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release_region(*port, ARCNET_TOTAL_SIZE);
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*port-- = ports[--numports];
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continue;
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}
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} else {
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airq = irq;
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}
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BUGMSG2(D_INIT, "(%d,", airq);
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openparen = 1;
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/* Everything seems okay. But which shmem, if any, puts
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* back its signature byte when the card is reset?
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*
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* If there are multiple cards installed, there might be
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* multiple shmems still in the list.
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*/
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#ifdef FAST_PROBE
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if (numports > 1 || numshmems > 1) {
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inb(_RESET);
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mdelay(RESETtime);
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} else {
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/* just one shmem and port, assume they match */
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isa_writeb(TESTvalue, shmems[0]);
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}
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#else
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inb(_RESET);
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mdelay(RESETtime);
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#endif
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for (p = &shmems[0]; p < shmems + numshmems; p++) {
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u_long ptr = *p;
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if (isa_readb(ptr) == TESTvalue) { /* found one */
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BUGMSG2(D_INIT, "%lXh)\n", *p);
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openparen = 0;
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/* register the card */
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if (com90xx_found(*port, airq, *p) == 0)
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found = 1;
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numprint = -1;
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/* remove shmem from the list */
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*p = shmems[--numshmems];
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break; /* go to the next I/O port */
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} else {
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BUGMSG2(D_INIT_REASONS, "%Xh-", isa_readb(ptr));
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}
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}
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if (openparen) {
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BUGLVL(D_INIT) printk("no matching shmem)\n");
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BUGLVL(D_INIT_REASONS) printk("S5: ");
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BUGLVL(D_INIT_REASONS) numprint = 0;
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}
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if (!found)
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release_region(*port, ARCNET_TOTAL_SIZE);
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*port-- = ports[--numports];
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}
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BUGLVL(D_INIT_REASONS) printk("\n");
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/* Now put back TESTvalue on all leftover shmems. */
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for (p = &shmems[0]; p < shmems + numshmems; p++) {
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isa_writeb(TESTvalue, *p);
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release_mem_region(*p, BUFFER_SIZE);
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}
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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 com90xx_found(int ioaddr, int airq, u_long shmem)
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{
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struct net_device *dev = NULL;
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struct arcnet_local *lp;
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u_long first_mirror, last_mirror;
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int mirror_size;
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/* allocate struct net_device */
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dev = alloc_arcdev(device);
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if (!dev) {
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BUGMSG2(D_NORMAL, "com90xx: Can't allocate device!\n");
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release_mem_region(shmem, BUFFER_SIZE);
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return -ENOMEM;
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}
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lp = dev->priv;
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/* find the real shared memory start/end points, including mirrors */
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/* guess the actual size of one "memory mirror" - the number of
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* bytes between copies of the shared memory. On most cards, it's
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* 2k (or there are no mirrors at all) but on some, it's 4k.
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*/
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mirror_size = MIRROR_SIZE;
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if (isa_readb(shmem) == TESTvalue
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&& isa_readb(shmem - mirror_size) != TESTvalue
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&& isa_readb(shmem - 2 * mirror_size) == TESTvalue)
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mirror_size *= 2;
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first_mirror = last_mirror = shmem;
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while (isa_readb(first_mirror) == TESTvalue)
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first_mirror -= mirror_size;
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first_mirror += mirror_size;
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while (isa_readb(last_mirror) == TESTvalue)
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last_mirror += mirror_size;
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last_mirror -= mirror_size;
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dev->mem_start = first_mirror;
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dev->mem_end = last_mirror + MIRROR_SIZE - 1;
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release_mem_region(shmem, BUFFER_SIZE);
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if (!request_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1, "arcnet (90xx)"))
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goto err_free_dev;
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/* reserve the irq */
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if (request_irq(airq, &arcnet_interrupt, 0, "arcnet (90xx)", dev)) {
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BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", airq);
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goto err_release_mem;
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}
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dev->irq = airq;
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/* Initialize the rest of the device structure. */
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lp->card_name = "COM90xx";
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lp->hw.command = com90xx_command;
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lp->hw.status = com90xx_status;
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lp->hw.intmask = com90xx_setmask;
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lp->hw.reset = com90xx_reset;
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lp->hw.owner = THIS_MODULE;
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lp->hw.copy_to_card = com90xx_copy_to_card;
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lp->hw.copy_from_card = com90xx_copy_from_card;
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lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
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if (!lp->mem_start) {
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BUGMSG(D_NORMAL, "Can't remap device memory!\n");
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goto err_free_irq;
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}
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/* get and check the station ID from offset 1 in shmem */
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dev->dev_addr[0] = readb(lp->mem_start + 1);
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dev->base_addr = ioaddr;
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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
|