drivers/net/arcnet/arc-rimi.c

   1 /*
   2  * Linux ARCnet driver - "RIM I" (entirely mem-mapped) cards
   3  *
   4  * Written 1994-1999 by Avery Pennarun.
   5  * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
   6  * Derived from skeleton.c by Donald Becker.
   7  *
   8  * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
   9  *  for sponsoring the further development of this driver.
  10  *
  11  * **********************
  12  *
  13  * The original copyright of skeleton.c was as follows:
  14  *
  15  * skeleton.c Written 1993 by Donald Becker.
  16  * Copyright 1993 United States Government as represented by the
  17  * Director, National Security Agency.  This software may only be used
  18  * and distributed according to the terms of the GNU General Public License as
  19  * modified by SRC, incorporated herein by reference.
  20  *
  21  * **********************
  22  *
  23  * For more details, see drivers/net/arcnet.c
  24  *
  25  * **********************
  26  */
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/ioport.h>
  31 #include <linux/delay.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/bootmem.h>
  34 #include <linux/init.h>
  35 #include <asm/io.h>
  36 #include <linux/arcdevice.h>
  37
  38
  39 #define VERSION "arcnet: RIM I (entirely mem-mapped) support\n"
  40
  41
  42 /* Internal function declarations */
  43
  44 static int arcrimi_probe(struct net_device *dev);
  45 static int arcrimi_found(struct net_device *dev);
  46 static void arcrimi_command(struct net_device *dev, int command);
  47 static int arcrimi_status(struct net_device *dev);
  48 static void arcrimi_setmask(struct net_device *dev, int mask);
  49 static int arcrimi_reset(struct net_device *dev, int really_reset);
  50 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
  51                                  void *buf, int count);
  52 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
  53                                    void *buf, int count);
  54
  55 /* Handy defines for ARCnet specific stuff */
  56
  57 /* Amount of I/O memory used by the card */
  58 #define BUFFER_SIZE (512)
  59 #define MIRROR_SIZE (BUFFER_SIZE*4)
  60
  61 /* COM 9026 controller chip --> ARCnet register addresses */
  62 #define _INTMASK (ioaddr+0)     /* writable */
  63 #define _STATUS  (ioaddr+0)     /* readable */
  64 #define _COMMAND (ioaddr+1)     /* writable, returns random vals on read (?) */
  65 #define _RESET  (ioaddr+8)      /* software reset (on read) */
  66 #define _MEMDATA  (ioaddr+12)   /* Data port for IO-mapped memory */
  67 #define _ADDR_HI  (ioaddr+15)   /* Control registers for said */
  68 #define _ADDR_LO  (ioaddr+14)
  69 #define _CONFIG  (ioaddr+2)     /* Configuration register */
  70
  71 #undef ASTATUS
  72 #undef ACOMMAND
  73 #undef AINTMASK
  74
  75 #define ASTATUS()       readb(_STATUS)
  76 #define ACOMMAND(cmd)   writeb((cmd),_COMMAND)
  77 #define AINTMASK(msk)   writeb((msk),_INTMASK)
  78 #define SETCONF()       writeb(lp->config,_CONFIG)
  79
  80
  81 /*
  82  * We cannot probe for a RIM I card; one reason is I don't know how to reset
  83  * them.  In fact, we can't even get their node ID automatically.  So, we
  84  * need to be passed a specific shmem address, IRQ, and node ID.
  85  */
  86 static int __init arcrimi_probe(struct net_device *dev)
  87 {
  88         BUGLVL(D_NORMAL) printk(VERSION);
  89         BUGLVL(D_NORMAL) printk("E-mail me if you actually test the RIM I driver, please!\n");
  90
  91         BUGMSG(D_NORMAL, "Given: node %02Xh, shmem %lXh, irq %d\n",
  92                dev->dev_addr[0], dev->mem_start, dev->irq);
  93
  94         if (dev->mem_start <= 0 || dev->irq <= 0) {
  95                 BUGMSG(D_NORMAL, "No autoprobe for RIM I; you "
  96                        "must specify the shmem and irq!\n");
  97                 return -ENODEV;
  98         }
  99         if (dev->dev_addr[0] == 0) {
 100                 BUGMSG(D_NORMAL, "You need to specify your card's station "
 101                        "ID!\n");
 102                 return -ENODEV;
 103         }
 104         /*
 105          * Grab the memory region at mem_start for MIRROR_SIZE bytes.
 106          * Later in arcrimi_found() the real size will be determined
 107          * and this reserve will be released and the correct size
 108          * will be taken.
 109          */
 110         if (!request_mem_region(dev->mem_start, MIRROR_SIZE, "arcnet (90xx)")) {
 111                 BUGMSG(D_NORMAL, "Card memory already allocated\n");
 112                 return -ENODEV;
 113         }
 114         return arcrimi_found(dev);
 115 }
 116
 117 static int check_mirror(unsigned long addr, size_t size)
 118 {
 119         void __iomem *p;
 120         int res = -1;
 121
 122         if (!request_mem_region(addr, size, "arcnet (90xx)"))
 123                 return -1;
 124
 125         p = ioremap(addr, size);
 126         if (p) {
 127                 if (readb(p) == TESTvalue)
 128                         res = 1;
 129                 else
 130                         res = 0;
 131                 iounmap(p);
 132         }
 133
 134         release_mem_region(addr, size);
 135         return res;
 136 }
 137
 138 /*
 139  * Set up the struct net_device associated with this card.  Called after
 140  * probing succeeds.
 141  */
 142 static int __init arcrimi_found(struct net_device *dev)
 143 {
 144         struct arcnet_local *lp;
 145         unsigned long first_mirror, last_mirror, shmem;
 146         void __iomem *p;
 147         int mirror_size;
 148         int err;
 149
 150         p = ioremap(dev->mem_start, MIRROR_SIZE);
 151         if (!p) {
 152                 release_mem_region(dev->mem_start, MIRROR_SIZE);
 153                 BUGMSG(D_NORMAL, "Can't ioremap\n");
 154                 return -ENODEV;
 155         }
 156
 157         /* reserve the irq */
 158         if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (RIM I)", dev)) {
 159                 iounmap(p);
 160                 release_mem_region(dev->mem_start, MIRROR_SIZE);
 161                 BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
 162                 return -ENODEV;
 163         }
 164
 165         shmem = dev->mem_start;
 166         writeb(TESTvalue, p);
 167         writeb(dev->dev_addr[0], p + 1);        /* actually the node ID */
 168
 169         /* find the real shared memory start/end points, including mirrors */
 170
 171         /* guess the actual size of one "memory mirror" - the number of
 172          * bytes between copies of the shared memory.  On most cards, it's
 173          * 2k (or there are no mirrors at all) but on some, it's 4k.
 174          */
 175         mirror_size = MIRROR_SIZE;
 176         if (readb(p) == TESTvalue &&
 177             check_mirror(shmem - MIRROR_SIZE, MIRROR_SIZE) == 0 &&
 178             check_mirror(shmem - 2 * MIRROR_SIZE, MIRROR_SIZE) == 1)
 179                 mirror_size = 2 * MIRROR_SIZE;
 180
 181         first_mirror = shmem - mirror_size;
 182         while (check_mirror(first_mirror, mirror_size) == 1)
 183                 first_mirror -= mirror_size;
 184         first_mirror += mirror_size;
 185
 186         last_mirror = shmem + mirror_size;
 187         while (check_mirror(last_mirror, mirror_size) == 1)
 188                 last_mirror += mirror_size;
 189         last_mirror -= mirror_size;
 190
 191         dev->mem_start = first_mirror;
 192         dev->mem_end = last_mirror + MIRROR_SIZE - 1;
 193
 194         /* initialize the rest of the device structure. */
 195
 196         lp = netdev_priv(dev);
 197         lp->card_name = "RIM I";
 198         lp->hw.command = arcrimi_command;
 199         lp->hw.status = arcrimi_status;
 200         lp->hw.intmask = arcrimi_setmask;
 201         lp->hw.reset = arcrimi_reset;
 202         lp->hw.owner = THIS_MODULE;
 203         lp->hw.copy_to_card = arcrimi_copy_to_card;
 204         lp->hw.copy_from_card = arcrimi_copy_from_card;
 205
 206         /*
 207          * re-reserve the memory region - arcrimi_probe() alloced this reqion
 208          * but didn't know the real size.  Free that region and then re-get
 209          * with the correct size.  There is a VERY slim chance this could
 210          * fail.
 211          */
 212         iounmap(p);
 213         release_mem_region(shmem, MIRROR_SIZE);
 214         if (!request_mem_region(dev->mem_start,
 215                                 dev->mem_end - dev->mem_start + 1,
 216                                 "arcnet (90xx)")) {
 217                 BUGMSG(D_NORMAL, "Card memory already allocated\n");
 218                 goto err_free_irq;
 219         }
 220
 221         lp->mem_start = ioremap(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 222         if (!lp->mem_start) {
 223                 BUGMSG(D_NORMAL, "Can't remap device memory!\n");
 224                 goto err_release_mem;
 225         }
 226
 227         /* get and check the station ID from offset 1 in shmem */
 228         dev->dev_addr[0] = readb(lp->mem_start + 1);
 229
 230         BUGMSG(D_NORMAL, "ARCnet RIM I: station %02Xh found at IRQ %d, "
 231                "ShMem %lXh (%ld*%d bytes).\n",
 232                dev->dev_addr[0],
 233                dev->irq, dev->mem_start,
 234          (dev->mem_end - dev->mem_start + 1) / mirror_size, mirror_size);
 235
 236         err = register_netdev(dev);
 237         if (err)
 238                 goto err_unmap;
 239
 240         return 0;
 241
 242 err_unmap:
 243         iounmap(lp->mem_start);
 244 err_release_mem:
 245         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 246 err_free_irq:
 247         free_irq(dev->irq, dev);
 248         return -EIO;
 249 }
 250
 251
 252 /*
 253  * Do a hardware reset on the card, and set up necessary registers.
 254  *
 255  * This should be called as little as possible, because it disrupts the
 256  * token on the network (causes a RECON) and requires a significant delay.
 257  *
 258  * However, it does make sure the card is in a defined state.
 259  */
 260 static int arcrimi_reset(struct net_device *dev, int really_reset)
 261 {
 262         struct arcnet_local *lp = netdev_priv(dev);
 263         void __iomem *ioaddr = lp->mem_start + 0x800;
 264
 265         BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS());
 266
 267         if (really_reset) {
 268                 writeb(TESTvalue, ioaddr - 0x800);      /* fake reset */
 269                 return 0;
 270         }
 271         ACOMMAND(CFLAGScmd | RESETclear);       /* clear flags & end reset */
 272         ACOMMAND(CFLAGScmd | CONFIGclear);
 273
 274         /* enable extended (512-byte) packets */
 275         ACOMMAND(CONFIGcmd | EXTconf);
 276
 277         /* done!  return success. */
 278         return 0;
 279 }
 280
 281 static void arcrimi_setmask(struct net_device *dev, int mask)
 282 {
 283         struct arcnet_local *lp = netdev_priv(dev);
 284         void __iomem *ioaddr = lp->mem_start + 0x800;
 285
 286         AINTMASK(mask);
 287 }
 288
 289 static int arcrimi_status(struct net_device *dev)
 290 {
 291         struct arcnet_local *lp = netdev_priv(dev);
 292         void __iomem *ioaddr = lp->mem_start + 0x800;
 293
 294         return ASTATUS();
 295 }
 296
 297 static void arcrimi_command(struct net_device *dev, int cmd)
 298 {
 299         struct arcnet_local *lp = netdev_priv(dev);
 300         void __iomem *ioaddr = lp->mem_start + 0x800;
 301
 302         ACOMMAND(cmd);
 303 }
 304
 305 static void arcrimi_copy_to_card(struct net_device *dev, int bufnum, int offset,
 306                                  void *buf, int count)
 307 {
 308         struct arcnet_local *lp = netdev_priv(dev);
 309         void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
 310         TIME("memcpy_toio", count, memcpy_toio(memaddr, buf, count));
 311 }
 312
 313
 314 static void arcrimi_copy_from_card(struct net_device *dev, int bufnum, int offset,
 315                                    void *buf, int count)
 316 {
 317         struct arcnet_local *lp = netdev_priv(dev);
 318         void __iomem *memaddr = lp->mem_start + 0x800 + bufnum * 512 + offset;
 319         TIME("memcpy_fromio", count, memcpy_fromio(buf, memaddr, count));
 320 }
 321
 322 static int node;
 323 static int io;                  /* use the insmod io= irq= node= options */
 324 static int irq;
 325 static char device[9];          /* use eg. device=arc1 to change name */
 326
 327 module_param(node, int, 0);
 328 module_param(io, int, 0);
 329 module_param(irq, int, 0);
 330 module_param_string(device, device, sizeof(device), 0);
 331 MODULE_LICENSE("GPL");
 332
 333 static struct net_device *my_dev;
 334
 335 static int __init arc_rimi_init(void)
 336 {
 337         struct net_device *dev;
 338
 339         dev = alloc_arcdev(device);
 340         if (!dev)
 341                 return -ENOMEM;
 342
 343         if (node && node != 0xff)
 344                 dev->dev_addr[0] = node;
 345
 346         dev->mem_start = io;
 347         dev->irq = irq;
 348         if (dev->irq == 2)
 349                 dev->irq = 9;
 350
 351         if (arcrimi_probe(dev)) {
 352                 free_netdev(dev);
 353                 return -EIO;
 354         }
 355
 356         my_dev = dev;
 357         return 0;
 358 }
 359
 360 static void __exit arc_rimi_exit(void)
 361 {
 362         struct net_device *dev = my_dev;
 363         struct arcnet_local *lp = netdev_priv(dev);
 364
 365         unregister_netdev(dev);
 366         iounmap(lp->mem_start);
 367         release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
 368         free_irq(dev->irq, dev);
 369         free_netdev(dev);
 370 }
 371
 372 #ifndef MODULE
 373 static int __init arcrimi_setup(char *s)
 374 {
 375         int ints[8];
 376         s = get_options(s, 8, ints);
 377         if (!ints[0])
 378                 return 1;
 379         switch (ints[0]) {
 380         default:                /* ERROR */
 381                 printk("arcrimi: Too many arguments.\n");
 382         case 3:         /* Node ID */
 383                 node = ints[3];
 384         case 2:         /* IRQ */
 385                 irq = ints[2];
 386         case 1:         /* IO address */
 387                 io = ints[1];
 388         }
 389         if (*s)
 390                 snprintf(device, sizeof(device), "%s", s);
 391         return 1;
 392 }
 393 __setup("arcrimi=", arcrimi_setup);
 394 #endif                          /* MODULE */
 395
 396 module_init(arc_rimi_init)
 397 module_exit(arc_rimi_exit)