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