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