drivers/net/wan/cycx_main.c

   1 /*
   2 * cycx_main.c   Cyclades Cyclom 2X WAN Link Driver. Main module.
   3 *
   4 * Author:       Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   5 *
   6 * Copyright:    (c) 1998-2003 Arnaldo Carvalho de Melo
   7 *
   8 * Based on sdlamain.c by Gene Kozin <genek@compuserve.com> &
   9 *                        Jaspreet Singh <jaspreet@sangoma.com>
  10 *
  11 *               This program is free software; you can redistribute it and/or
  12 *               modify it under the terms of the GNU General Public License
  13 *               as published by the Free Software Foundation; either version
  14 *               2 of the License, or (at your option) any later version.
  15 * ============================================================================
  16 * Please look at the bitkeeper changelog (or any other scm tool that ends up
  17 * importing bitkeeper changelog or that replaces bitkeeper in the future as
  18 * main tool for linux development).
  19 *
  20 * 2001/05/09    acme            Fix MODULE_DESC for debug, .bss nitpicks,
  21 *                               some cleanups
  22 * 2000/07/13    acme            remove useless #ifdef MODULE and crap
  23 *                               #if KERNEL_VERSION > blah
  24 * 2000/07/06    acme            __exit at cyclomx_cleanup
  25 * 2000/04/02    acme            dprintk and cycx_debug
  26 *                               module_init/module_exit
  27 * 2000/01/21    acme            rename cyclomx_open to cyclomx_mod_inc_use_count
  28 *                               and cyclomx_close to cyclomx_mod_dec_use_count
  29 * 2000/01/08    acme            cleanup
  30 * 1999/11/06    acme            cycx_down back to life (it needs to be
  31 *                               called to iounmap the dpmbase)
  32 * 1999/08/09    acme            removed references to enable_tx_int
  33 *                               use spinlocks instead of cli/sti in
  34 *                               cyclomx_set_state
  35 * 1999/05/19    acme            works directly linked into the kernel
  36 *                               init_waitqueue_head for 2.3.* kernel
  37 * 1999/05/18    acme            major cleanup (polling not needed), etc
  38 * 1998/08/28    acme            minor cleanup (ioctls for firmware deleted)
  39 *                               queue_task activated
  40 * 1998/08/08    acme            Initial version.
  41 */
  42
  43 #include <linux/stddef.h>       /* offsetof(), etc. */
  44 #include <linux/errno.h>        /* return codes */
  45 #include <linux/string.h>       /* inline memset(), etc. */
  46 #include <linux/slab.h>         /* kmalloc(), kfree() */
  47 #include <linux/kernel.h>       /* printk(), and other useful stuff */
  48 #include <linux/module.h>       /* support for loadable modules */
  49 #include <linux/ioport.h>       /* request_region(), release_region() */
  50 #include <linux/wanrouter.h>    /* WAN router definitions */
  51 #include <linux/cyclomx.h>      /* cyclomx common user API definitions */
  52 #include <linux/init.h>         /* __init (when not using as a module) */
  53
  54 unsigned int cycx_debug;
  55
  56 MODULE_AUTHOR("Arnaldo Carvalho de Melo");
  57 MODULE_DESCRIPTION("Cyclom 2X Sync Card Driver.");
  58 MODULE_LICENSE("GPL");
  59 module_param(cycx_debug, int, 0);
  60 MODULE_PARM_DESC(cycx_debug, "cyclomx debug level");
  61
  62 /* Defines & Macros */
  63
  64 #define CYCX_DRV_VERSION        0       /* version number */
  65 #define CYCX_DRV_RELEASE        11      /* release (minor version) number */
  66 #define CYCX_MAX_CARDS          1       /* max number of adapters */
  67
  68 #define CONFIG_CYCX_CARDS 1
  69
  70 /* Function Prototypes */
  71
  72 /* WAN link driver entry points */
  73 static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf);
  74 static int cycx_wan_shutdown(struct wan_device *wandev);
  75
  76 /* Miscellaneous functions */
  77 static irqreturn_t cycx_isr(int irq, void *dev_id);
  78
  79 /* Global Data
  80  * Note: All data must be explicitly initialized!!!
  81  */
  82
  83 /* private data */
  84 static char cycx_drvname[] = "cyclomx";
  85 static char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
  86 static char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
  87                           "<acme@conectiva.com.br>";
  88 static int cycx_ncards = CONFIG_CYCX_CARDS;
  89 static struct cycx_device *cycx_card_array;     /* adapter data space */
  90
  91 /* Kernel Loadable Module Entry Points */
  92
  93 /*
  94  * Module 'insert' entry point.
  95  * o print announcement
  96  * o allocate adapter data space
  97  * o initialize static data
  98  * o register all cards with WAN router
  99  * o calibrate Cyclom 2X shared memory access delay.
 100  *
 101  * Return:      0       Ok
 102  *              < 0     error.
 103  * Context:     process
 104  */
 105 static int __init cycx_init(void)
 106 {
 107         int cnt, err = -ENOMEM;
 108
 109         printk(KERN_INFO "%s v%u.%u %s\n",
 110                 cycx_fullname, CYCX_DRV_VERSION, CYCX_DRV_RELEASE,
 111                 cycx_copyright);
 112
 113         /* Verify number of cards and allocate adapter data space */
 114         cycx_ncards = min_t(int, cycx_ncards, CYCX_MAX_CARDS);
 115         cycx_ncards = max_t(int, cycx_ncards, 1);
 116         cycx_card_array = kmalloc(sizeof(struct cycx_device) * cycx_ncards,
 117                                   GFP_KERNEL);
 118         if (!cycx_card_array)
 119                 goto out;
 120
 121         memset(cycx_card_array, 0, sizeof(struct cycx_device) * cycx_ncards);
 122
 123         /* Register adapters with WAN router */
 124         for (cnt = 0; cnt < cycx_ncards; ++cnt) {
 125                 struct cycx_device *card = &cycx_card_array[cnt];
 126                 struct wan_device *wandev = &card->wandev;
 127
 128                 sprintf(card->devname, "%s%d", cycx_drvname, cnt + 1);
 129                 wandev->magic    = ROUTER_MAGIC;
 130                 wandev->name     = card->devname;
 131                 wandev->private  = card;
 132                 wandev->setup    = cycx_wan_setup;
 133                 wandev->shutdown = cycx_wan_shutdown;
 134                 err = register_wan_device(wandev);
 135
 136                 if (err) {
 137                         printk(KERN_ERR "%s: %s registration failed with "
 138                                         "error %d!\n",
 139                                         cycx_drvname, card->devname, err);
 140                         break;
 141                 }
 142         }
 143
 144         err = -ENODEV;
 145         if (!cnt) {
 146                 kfree(cycx_card_array);
 147                 goto out;
 148         }
 149         err = 0;
 150         cycx_ncards = cnt;      /* adjust actual number of cards */
 151 out:    return err;
 152 }
 153
 154 /*
 155  * Module 'remove' entry point.
 156  * o unregister all adapters from the WAN router
 157  * o release all remaining system resources
 158  */
 159 static void __exit cycx_exit(void)
 160 {
 161         int i = 0;
 162
 163         for (; i < cycx_ncards; ++i) {
 164                 struct cycx_device *card = &cycx_card_array[i];
 165                 unregister_wan_device(card->devname);
 166         }
 167
 168         kfree(cycx_card_array);
 169 }
 170
 171 /* WAN Device Driver Entry Points */
 172 /*
 173  * Setup/configure WAN link driver.
 174  * o check adapter state
 175  * o make sure firmware is present in configuration
 176  * o allocate interrupt vector
 177  * o setup Cyclom 2X hardware
 178  * o call appropriate routine to perform protocol-specific initialization
 179  *
 180  * This function is called when router handles ROUTER_SETUP IOCTL. The
 181  * configuration structure is in kernel memory (including extended data, if
 182  * any).
 183  */
 184 static int cycx_wan_setup(struct wan_device *wandev, wandev_conf_t *conf)
 185 {
 186         int rc = -EFAULT;
 187         struct cycx_device *card;
 188         int irq;
 189
 190         /* Sanity checks */
 191
 192         if (!wandev || !wandev->private || !conf)
 193                 goto out;
 194
 195         card = wandev->private;
 196         rc = -EBUSY;
 197         if (wandev->state != WAN_UNCONFIGURED)
 198                 goto out;
 199
 200         rc = -EINVAL;
 201         if (!conf->data_size || !conf->data) {
 202                 printk(KERN_ERR "%s: firmware not found in configuration "
 203                                 "data!\n", wandev->name);
 204                 goto out;
 205         }
 206
 207         if (conf->irq <= 0) {
 208                 printk(KERN_ERR "%s: can't configure without IRQ!\n",
 209                                 wandev->name);
 210                 goto out;
 211         }
 212
 213         /* Allocate IRQ */
 214         irq = conf->irq == 2 ? 9 : conf->irq;   /* IRQ2 -> IRQ9 */
 215
 216         if (request_irq(irq, cycx_isr, 0, wandev->name, card)) {
 217                 printk(KERN_ERR "%s: can't reserve IRQ %d!\n",
 218                                 wandev->name, irq);
 219                 goto out;
 220         }
 221
 222         /* Configure hardware, load firmware, etc. */
 223         memset(&card->hw, 0, sizeof(card->hw));
 224         card->hw.irq     = irq;
 225         card->hw.dpmsize = CYCX_WINDOWSIZE;
 226         card->hw.fwid    = CFID_X25_2X;
 227         spin_lock_init(&card->lock);
 228         init_waitqueue_head(&card->wait_stats);
 229
 230         rc = cycx_setup(&card->hw, conf->data, conf->data_size, conf->maddr);
 231         if (rc)
 232                 goto out_irq;
 233
 234         /* Initialize WAN device data space */
 235         wandev->irq       = irq;
 236         wandev->dma       = wandev->ioport = 0;
 237         wandev->maddr     = (unsigned long)card->hw.dpmbase;
 238         wandev->msize     = card->hw.dpmsize;
 239         wandev->hw_opt[2] = 0;
 240         wandev->hw_opt[3] = card->hw.fwid;
 241
 242         /* Protocol-specific initialization */
 243         switch (card->hw.fwid) {
 244 #ifdef CONFIG_CYCLOMX_X25
 245         case CFID_X25_2X:
 246                 rc = cycx_x25_wan_init(card, conf);
 247                 break;
 248 #endif
 249         default:
 250                 printk(KERN_ERR "%s: this firmware is not supported!\n",
 251                                 wandev->name);
 252                 rc = -EINVAL;
 253         }
 254
 255         if (rc) {
 256                 cycx_down(&card->hw);
 257                 goto out_irq;
 258         }
 259
 260         rc = 0;
 261 out:
 262         return rc;
 263 out_irq:
 264         free_irq(irq, card);
 265         goto out;
 266 }
 267
 268 /*
 269  * Shut down WAN link driver.
 270  * o shut down adapter hardware
 271  * o release system resources.
 272  *
 273  * This function is called by the router when device is being unregistered or
 274  * when it handles ROUTER_DOWN IOCTL.
 275  */
 276 static int cycx_wan_shutdown(struct wan_device *wandev)
 277 {
 278         int ret = -EFAULT;
 279         struct cycx_device *card;
 280
 281         /* sanity checks */
 282         if (!wandev || !wandev->private)
 283                 goto out;
 284
 285         ret = 0;
 286         if (wandev->state == WAN_UNCONFIGURED)
 287                 goto out;
 288
 289         card = wandev->private;
 290         wandev->state = WAN_UNCONFIGURED;
 291         cycx_down(&card->hw);
 292         printk(KERN_INFO "%s: irq %d being freed!\n", wandev->name,
 293                         wandev->irq);
 294         free_irq(wandev->irq, card);
 295 out:    return ret;
 296 }
 297
 298 /* Miscellaneous */
 299 /*
 300  * Cyclom 2X Interrupt Service Routine.
 301  * o acknowledge Cyclom 2X hardware interrupt.
 302  * o call protocol-specific interrupt service routine, if any.
 303  */
 304 static irqreturn_t cycx_isr(int irq, void *dev_id)
 305 {
 306         struct cycx_device *card = dev_id;
 307
 308         if (card->wandev.state == WAN_UNCONFIGURED)
 309                 goto out;
 310
 311         if (card->in_isr) {
 312                 printk(KERN_WARNING "%s: interrupt re-entrancy on IRQ %d!\n",
 313                                     card->devname, card->wandev.irq);
 314                 goto out;
 315         }
 316
 317         if (card->isr)
 318                 card->isr(card);
 319         return IRQ_HANDLED;
 320 out:
 321         return IRQ_NONE;
 322 }
 323
 324 /* Set WAN device state.  */
 325 void cycx_set_state(struct cycx_device *card, int state)
 326 {
 327         unsigned long flags;
 328         char *string_state = NULL;
 329
 330         spin_lock_irqsave(&card->lock, flags);
 331
 332         if (card->wandev.state != state) {
 333                 switch (state) {
 334                 case WAN_CONNECTED:
 335                         string_state = "connected!";
 336                         break;
 337                 case WAN_DISCONNECTED:
 338                         string_state = "disconnected!";
 339                         break;
 340                 }
 341                 printk(KERN_INFO "%s: link %s\n", card->devname, string_state);
 342                 card->wandev.state = state;
 343         }
 344
 345         card->state_tick = jiffies;
 346         spin_unlock_irqrestore(&card->lock, flags);
 347 }
 348
 349 module_init(cycx_init);
 350 module_exit(cycx_exit);