drivers/net/wireless/prism54/islpci_hotplug.c

   1 /*
   2  *
   3  *  Copyright (C) 2002 Intersil Americas Inc.
   4  *  Copyright (C) 2003 Herbert Valerio Riedel <hvr@gnu.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h> /* For __init, __exit */
  25
  26 #include "prismcompat.h"
  27 #include "islpci_dev.h"
  28 #include "islpci_mgt.h"         /* for pc_debug */
  29 #include "isl_oid.h"
  30
  31 #define DRV_NAME        "prism54"
  32 #define DRV_VERSION     "1.2"
  33
  34 MODULE_AUTHOR("[Intersil] R.Bastings and W.Termorshuizen, The prism54.org Development Team <prism54-devel@prism54.org>");
  35 MODULE_DESCRIPTION("The Prism54 802.11 Wireless LAN adapter");
  36 MODULE_LICENSE("GPL");
  37
  38 static int      init_pcitm = 0;
  39 module_param(init_pcitm, int, 0);
  40
  41 /* In this order: vendor, device, subvendor, subdevice, class, class_mask,
  42  * driver_data
  43  * If you have an update for this please contact prism54-devel@prism54.org
  44  * The latest list can be found at http://prism54.org/supported_cards.php */
  45 static const struct pci_device_id prism54_id_tbl[] = {
  46         /* Intersil PRISM Duette/Prism GT Wireless LAN adapter */
  47         {
  48          0x1260, 0x3890,
  49          PCI_ANY_ID, PCI_ANY_ID,
  50          0, 0, 0
  51         },
  52
  53         /* 3COM 3CRWE154G72 Wireless LAN adapter */
  54         {
  55          0x10b7, 0x6001,
  56          PCI_ANY_ID, PCI_ANY_ID,
  57          0, 0, 0
  58         },
  59
  60         /* Intersil PRISM Indigo Wireless LAN adapter */
  61         {
  62          0x1260, 0x3877,
  63          PCI_ANY_ID, PCI_ANY_ID,
  64          0, 0, 0
  65         },
  66
  67         /* Intersil PRISM Javelin/Xbow Wireless LAN adapter */
  68         {
  69          0x1260, 0x3886,
  70          PCI_ANY_ID, PCI_ANY_ID,
  71          0, 0, 0
  72         },
  73
  74         /* End of list */
  75         {0,0,0,0,0,0,0}
  76 };
  77
  78 /* register the device with the Hotplug facilities of the kernel */
  79 MODULE_DEVICE_TABLE(pci, prism54_id_tbl);
  80
  81 static int prism54_probe(struct pci_dev *, const struct pci_device_id *);
  82 static void prism54_remove(struct pci_dev *);
  83 static int prism54_suspend(struct pci_dev *, pm_message_t state);
  84 static int prism54_resume(struct pci_dev *);
  85
  86 static struct pci_driver prism54_driver = {
  87         .name = DRV_NAME,
  88         .id_table = prism54_id_tbl,
  89         .probe = prism54_probe,
  90         .remove = prism54_remove,
  91         .suspend = prism54_suspend,
  92         .resume = prism54_resume,
  93         /* .enable_wake ; we don't support this yet */
  94 };
  95
  96 /******************************************************************************
  97     Module initialization functions
  98 ******************************************************************************/
  99
 100 int
 101 prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 102 {
 103         struct net_device *ndev;
 104         u8 latency_tmr;
 105         u32 mem_addr;
 106         islpci_private *priv;
 107         int rvalue;
 108
 109         /* Enable the pci device */
 110         if (pci_enable_device(pdev)) {
 111                 printk(KERN_ERR "%s: pci_enable_device() failed.\n", DRV_NAME);
 112                 return -ENODEV;
 113         }
 114
 115         /* check whether the latency timer is set correctly */
 116         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency_tmr);
 117 #if VERBOSE > SHOW_ERROR_MESSAGES
 118         DEBUG(SHOW_TRACING, "latency timer: %x\n", latency_tmr);
 119 #endif
 120         if (latency_tmr < PCIDEVICE_LATENCY_TIMER_MIN) {
 121                 /* set the latency timer */
 122                 pci_write_config_byte(pdev, PCI_LATENCY_TIMER,
 123                                       PCIDEVICE_LATENCY_TIMER_VAL);
 124         }
 125
 126         /* enable PCI DMA */
 127         if (pci_set_dma_mask(pdev, 0xffffffff)) {
 128                 printk(KERN_ERR "%s: 32-bit PCI DMA not supported", DRV_NAME);
 129                 goto do_pci_disable_device;
 130         }
 131
 132         /* 0x40 is the programmable timer to configure the response timeout (TRDY_TIMEOUT)
 133          * 0x41 is the programmable timer to configure the retry timeout (RETRY_TIMEOUT)
 134          *      The RETRY_TIMEOUT is used to set the number of retries that the core, as a
 135          *      Master, will perform before abandoning a cycle. The default value for
 136          *      RETRY_TIMEOUT is 0x80, which far exceeds the PCI 2.1 requirement for new
 137          *      devices. A write of zero to the RETRY_TIMEOUT register disables this
 138          *      function to allow use with any non-compliant legacy devices that may
 139          *      execute more retries.
 140          *
 141          *      Writing zero to both these two registers will disable both timeouts and
 142          *      *can* solve problems caused by devices that are slow to respond.
 143          *      Make this configurable - MSW
 144          */
 145         if ( init_pcitm >= 0 ) {
 146                 pci_write_config_byte(pdev, 0x40, (u8)init_pcitm);
 147                 pci_write_config_byte(pdev, 0x41, (u8)init_pcitm);
 148         } else {
 149                 printk(KERN_INFO "PCI TRDY/RETRY unchanged\n");
 150         }
 151
 152         /* request the pci device I/O regions */
 153         rvalue = pci_request_regions(pdev, DRV_NAME);
 154         if (rvalue) {
 155                 printk(KERN_ERR "%s: pci_request_regions failure (rc=%d)\n",
 156                        DRV_NAME, rvalue);
 157                 goto do_pci_disable_device;
 158         }
 159
 160         /* check if the memory window is indeed set */
 161         rvalue = pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &mem_addr);
 162         if (rvalue || !mem_addr) {
 163                 printk(KERN_ERR "%s: PCI device memory region not configured; fix your BIOS or CardBus bridge/drivers\n",
 164                        DRV_NAME);
 165                 goto do_pci_release_regions;
 166         }
 167
 168         /* enable PCI bus-mastering */
 169         DEBUG(SHOW_TRACING, "%s: pci_set_master(pdev)\n", DRV_NAME);
 170         pci_set_master(pdev);
 171
 172         /* enable MWI */
 173         pci_set_mwi(pdev);
 174
 175         /* setup the network device interface and its structure */
 176         if (!(ndev = islpci_setup(pdev))) {
 177                 /* error configuring the driver as a network device */
 178                 printk(KERN_ERR "%s: could not configure network device\n",
 179                        DRV_NAME);
 180                 goto do_pci_release_regions;
 181         }
 182
 183         priv = netdev_priv(ndev);
 184         islpci_set_state(priv, PRV_STATE_PREBOOT); /* we are attempting to boot */
 185
 186         /* card is in unknown state yet, might have some interrupts pending */
 187         isl38xx_disable_interrupts(priv->device_base);
 188
 189         /* request for the interrupt before uploading the firmware */
 190         rvalue = request_irq(pdev->irq, &islpci_interrupt,
 191                              SA_SHIRQ, ndev->name, priv);
 192
 193         if (rvalue) {
 194                 /* error, could not hook the handler to the irq */
 195                 printk(KERN_ERR "%s: could not install IRQ handler\n",
 196                        ndev->name);
 197                 goto do_unregister_netdev;
 198         }
 199
 200         /* firmware upload is triggered in islpci_open */
 201
 202         return 0;
 203
 204       do_unregister_netdev:
 205         unregister_netdev(ndev);
 206         islpci_free_memory(priv);
 207         pci_set_drvdata(pdev, NULL);
 208         free_netdev(ndev);
 209         priv = NULL;
 210       do_pci_release_regions:
 211         pci_release_regions(pdev);
 212       do_pci_disable_device:
 213         pci_disable_device(pdev);
 214         return -EIO;
 215 }
 216
 217 /* set by cleanup_module */
 218 static volatile int __in_cleanup_module = 0;
 219
 220 /* this one removes one(!!) instance only */
 221 void
 222 prism54_remove(struct pci_dev *pdev)
 223 {
 224         struct net_device *ndev = pci_get_drvdata(pdev);
 225         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 226         BUG_ON(!priv);
 227
 228         if (!__in_cleanup_module) {
 229                 printk(KERN_DEBUG "%s: hot unplug detected\n", ndev->name);
 230                 islpci_set_state(priv, PRV_STATE_OFF);
 231         }
 232
 233         printk(KERN_DEBUG "%s: removing device\n", ndev->name);
 234
 235         unregister_netdev(ndev);
 236
 237         /* free the interrupt request */
 238
 239         if (islpci_get_state(priv) != PRV_STATE_OFF) {
 240                 isl38xx_disable_interrupts(priv->device_base);
 241                 islpci_set_state(priv, PRV_STATE_OFF);
 242                 /* This bellow causes a lockup at rmmod time. It might be
 243                  * because some interrupts still linger after rmmod time,
 244                  * see bug #17 */
 245                 /* pci_set_power_state(pdev, 3);*/      /* try to power-off */
 246         }
 247
 248         free_irq(pdev->irq, priv);
 249
 250         /* free the PCI memory and unmap the remapped page */
 251         islpci_free_memory(priv);
 252
 253         pci_set_drvdata(pdev, NULL);
 254         free_netdev(ndev);
 255         priv = NULL;
 256
 257         pci_release_regions(pdev);
 258
 259         pci_disable_device(pdev);
 260 }
 261
 262 int
 263 prism54_suspend(struct pci_dev *pdev, pm_message_t state)
 264 {
 265         struct net_device *ndev = pci_get_drvdata(pdev);
 266         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 267         BUG_ON(!priv);
 268
 269
 270         pci_save_state(pdev);
 271
 272         /* tell the device not to trigger interrupts for now... */
 273         isl38xx_disable_interrupts(priv->device_base);
 274
 275         /* from now on assume the hardware was already powered down
 276            and don't touch it anymore */
 277         islpci_set_state(priv, PRV_STATE_OFF);
 278
 279         netif_stop_queue(ndev);
 280         netif_device_detach(ndev);
 281
 282         return 0;
 283 }
 284
 285 int
 286 prism54_resume(struct pci_dev *pdev)
 287 {
 288         struct net_device *ndev = pci_get_drvdata(pdev);
 289         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 290         BUG_ON(!priv);
 291
 292         pci_enable_device(pdev);
 293
 294         printk(KERN_NOTICE "%s: got resume request\n", ndev->name);
 295
 296         pci_restore_state(pdev);
 297
 298         /* alright let's go into the PREBOOT state */
 299         islpci_reset(priv, 1);
 300
 301         netif_device_attach(ndev);
 302         netif_start_queue(ndev);
 303
 304         return 0;
 305 }
 306
 307 static int __init
 308 prism54_module_init(void)
 309 {
 310         printk(KERN_INFO "Loaded %s driver, version %s\n",
 311                DRV_NAME, DRV_VERSION);
 312
 313         __bug_on_wrong_struct_sizes ();
 314
 315         return pci_module_init(&prism54_driver);
 316 }
 317
 318 /* by the time prism54_module_exit() terminates, as a postcondition
 319  * all instances will have been destroyed by calls to
 320  * prism54_remove() */
 321 static void __exit
 322 prism54_module_exit(void)
 323 {
 324         __in_cleanup_module = 1;
 325
 326         pci_unregister_driver(&prism54_driver);
 327
 328         printk(KERN_INFO "Unloaded %s driver\n", DRV_NAME);
 329
 330         __in_cleanup_module = 0;
 331 }
 332
 333 /* register entry points */
 334 module_init(prism54_module_init);
 335 module_exit(prism54_module_exit);
 336 /* EOF */