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