drivers/net/wireless/prism54/islpci_hotplug.c

   1 /*
   2  *  Copyright (C) 2002 Intersil Americas Inc.
   3  *  Copyright (C) 2003 Herbert Valerio Riedel <hvr@gnu.org>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  */
  18
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/pci.h>
  22 #include <linux/delay.h>
  23 #include <linux/init.h> /* For __init, __exit */
  24 #include <linux/dma-mapping.h>
  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 MODULE_AUTHOR("[Intersil] R.Bastings and W.Termorshuizen, The prism54.org Development Team <prism54-devel@prism54.org>");
  32 MODULE_DESCRIPTION("The Prism54 802.11 Wireless LAN adapter");
  33 MODULE_LICENSE("GPL");
  34
  35 static int      init_pcitm = 0;
  36 module_param(init_pcitm, int, 0);
  37
  38 /* In this order: vendor, device, subvendor, subdevice, class, class_mask,
  39  * driver_data
  40  * If you have an update for this please contact prism54-devel@prism54.org
  41  * The latest list can be found at http://wireless.kernel.org/en/users/Drivers/p54 */
  42 static const struct pci_device_id prism54_id_tbl[] = {
  43         /* Intersil PRISM Duette/Prism GT Wireless LAN adapter */
  44         {
  45          0x1260, 0x3890,
  46          PCI_ANY_ID, PCI_ANY_ID,
  47          0, 0, 0
  48         },
  49
  50         /* 3COM 3CRWE154G72 Wireless LAN adapter */
  51         {
  52          PCI_VDEVICE(3COM, 0x6001), 0
  53         },
  54
  55         /* Intersil PRISM Indigo Wireless LAN adapter */
  56         {
  57          0x1260, 0x3877,
  58          PCI_ANY_ID, PCI_ANY_ID,
  59          0, 0, 0
  60         },
  61
  62         /* Intersil PRISM Javelin/Xbow Wireless LAN adapter */
  63         {
  64          0x1260, 0x3886,
  65          PCI_ANY_ID, PCI_ANY_ID,
  66          0, 0, 0
  67         },
  68
  69         /* End of list */
  70         {0,0,0,0,0,0,0}
  71 };
  72
  73 /* register the device with the Hotplug facilities of the kernel */
  74 MODULE_DEVICE_TABLE(pci, prism54_id_tbl);
  75
  76 static int prism54_probe(struct pci_dev *, const struct pci_device_id *);
  77 static void prism54_remove(struct pci_dev *);
  78 static int prism54_suspend(struct pci_dev *, pm_message_t state);
  79 static int prism54_resume(struct pci_dev *);
  80
  81 static struct pci_driver prism54_driver = {
  82         .name = DRV_NAME,
  83         .id_table = prism54_id_tbl,
  84         .probe = prism54_probe,
  85         .remove = prism54_remove,
  86         .suspend = prism54_suspend,
  87         .resume = prism54_resume,
  88 };
  89
  90 /******************************************************************************
  91     Module initialization functions
  92 ******************************************************************************/
  93
  94 static int
  95 prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  96 {
  97         struct net_device *ndev;
  98         u8 latency_tmr;
  99         u32 mem_addr;
 100         islpci_private *priv;
 101         int rvalue;
 102
 103         /* Enable the pci device */
 104         if (pci_enable_device(pdev)) {
 105                 printk(KERN_ERR "%s: pci_enable_device() failed.\n", DRV_NAME);
 106                 return -ENODEV;
 107         }
 108
 109         /* check whether the latency timer is set correctly */
 110         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency_tmr);
 111 #if VERBOSE > SHOW_ERROR_MESSAGES
 112         DEBUG(SHOW_TRACING, "latency timer: %x\n", latency_tmr);
 113 #endif
 114         if (latency_tmr < PCIDEVICE_LATENCY_TIMER_MIN) {
 115                 /* set the latency timer */
 116                 pci_write_config_byte(pdev, PCI_LATENCY_TIMER,
 117                                       PCIDEVICE_LATENCY_TIMER_VAL);
 118         }
 119
 120         /* enable PCI DMA */
 121         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
 122                 printk(KERN_ERR "%s: 32-bit PCI DMA not supported", DRV_NAME);
 123                 goto do_pci_disable_device;
 124         }
 125
 126         /* 0x40 is the programmable timer to configure the response timeout (TRDY_TIMEOUT)
 127          * 0x41 is the programmable timer to configure the retry timeout (RETRY_TIMEOUT)
 128          *      The RETRY_TIMEOUT is used to set the number of retries that the core, as a
 129          *      Master, will perform before abandoning a cycle. The default value for
 130          *      RETRY_TIMEOUT is 0x80, which far exceeds the PCI 2.1 requirement for new
 131          *      devices. A write of zero to the RETRY_TIMEOUT register disables this
 132          *      function to allow use with any non-compliant legacy devices that may
 133          *      execute more retries.
 134          *
 135          *      Writing zero to both these two registers will disable both timeouts and
 136          *      *can* solve problems caused by devices that are slow to respond.
 137          *      Make this configurable - MSW
 138          */
 139         if ( init_pcitm >= 0 ) {
 140                 pci_write_config_byte(pdev, 0x40, (u8)init_pcitm);
 141                 pci_write_config_byte(pdev, 0x41, (u8)init_pcitm);
 142         } else {
 143                 printk(KERN_INFO "PCI TRDY/RETRY unchanged\n");
 144         }
 145
 146         /* request the pci device I/O regions */
 147         rvalue = pci_request_regions(pdev, DRV_NAME);
 148         if (rvalue) {
 149                 printk(KERN_ERR "%s: pci_request_regions failure (rc=%d)\n",
 150                        DRV_NAME, rvalue);
 151                 goto do_pci_disable_device;
 152         }
 153
 154         /* check if the memory window is indeed set */
 155         rvalue = pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &mem_addr);
 156         if (rvalue || !mem_addr) {
 157                 printk(KERN_ERR "%s: PCI device memory region not configured; fix your BIOS or CardBus bridge/drivers\n",
 158                        DRV_NAME);
 159                 goto do_pci_release_regions;
 160         }
 161
 162         /* enable PCI bus-mastering */
 163         DEBUG(SHOW_TRACING, "%s: pci_set_master(pdev)\n", DRV_NAME);
 164         pci_set_master(pdev);
 165
 166         /* enable MWI */
 167         pci_try_set_mwi(pdev);
 168
 169         /* setup the network device interface and its structure */
 170         if (!(ndev = islpci_setup(pdev))) {
 171                 /* error configuring the driver as a network device */
 172                 printk(KERN_ERR "%s: could not configure network device\n",
 173                        DRV_NAME);
 174                 goto do_pci_clear_mwi;
 175         }
 176
 177         priv = netdev_priv(ndev);
 178         islpci_set_state(priv, PRV_STATE_PREBOOT); /* we are attempting to boot */
 179
 180         /* card is in unknown state yet, might have some interrupts pending */
 181         isl38xx_disable_interrupts(priv->device_base);
 182
 183         /* request for the interrupt before uploading the firmware */
 184         rvalue = request_irq(pdev->irq, islpci_interrupt,
 185                              IRQF_SHARED, ndev->name, priv);
 186
 187         if (rvalue) {
 188                 /* error, could not hook the handler to the irq */
 189                 printk(KERN_ERR "%s: could not install IRQ handler\n",
 190                        ndev->name);
 191                 goto do_unregister_netdev;
 192         }
 193
 194         /* firmware upload is triggered in islpci_open */
 195
 196         return 0;
 197
 198       do_unregister_netdev:
 199         unregister_netdev(ndev);
 200         islpci_free_memory(priv);
 201         free_netdev(ndev);
 202         priv = NULL;
 203       do_pci_clear_mwi:
 204         pci_clear_mwi(pdev);
 205       do_pci_release_regions:
 206         pci_release_regions(pdev);
 207       do_pci_disable_device:
 208         pci_disable_device(pdev);
 209         return -EIO;
 210 }
 211
 212 /* set by cleanup_module */
 213 static volatile int __in_cleanup_module = 0;
 214
 215 /* this one removes one(!!) instance only */
 216 static void
 217 prism54_remove(struct pci_dev *pdev)
 218 {
 219         struct net_device *ndev = pci_get_drvdata(pdev);
 220         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 221         BUG_ON(!priv);
 222
 223         if (!__in_cleanup_module) {
 224                 printk(KERN_DEBUG "%s: hot unplug detected\n", ndev->name);
 225                 islpci_set_state(priv, PRV_STATE_OFF);
 226         }
 227
 228         printk(KERN_DEBUG "%s: removing device\n", ndev->name);
 229
 230         unregister_netdev(ndev);
 231
 232         /* free the interrupt request */
 233
 234         if (islpci_get_state(priv) != PRV_STATE_OFF) {
 235                 isl38xx_disable_interrupts(priv->device_base);
 236                 islpci_set_state(priv, PRV_STATE_OFF);
 237                 /* This bellow causes a lockup at rmmod time. It might be
 238                  * because some interrupts still linger after rmmod time,
 239                  * see bug #17 */
 240                 /* pci_set_power_state(pdev, 3);*/      /* try to power-off */
 241         }
 242
 243         free_irq(pdev->irq, priv);
 244
 245         /* free the PCI memory and unmap the remapped page */
 246         islpci_free_memory(priv);
 247
 248         free_netdev(ndev);
 249         priv = NULL;
 250
 251         pci_clear_mwi(pdev);
 252
 253         pci_release_regions(pdev);
 254
 255         pci_disable_device(pdev);
 256 }
 257
 258 static int
 259 prism54_suspend(struct pci_dev *pdev, pm_message_t state)
 260 {
 261         struct net_device *ndev = pci_get_drvdata(pdev);
 262         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 263         BUG_ON(!priv);
 264
 265
 266         pci_save_state(pdev);
 267
 268         /* tell the device not to trigger interrupts for now... */
 269         isl38xx_disable_interrupts(priv->device_base);
 270
 271         /* from now on assume the hardware was already powered down
 272            and don't touch it anymore */
 273         islpci_set_state(priv, PRV_STATE_OFF);
 274
 275         netif_stop_queue(ndev);
 276         netif_device_detach(ndev);
 277
 278         return 0;
 279 }
 280
 281 static int
 282 prism54_resume(struct pci_dev *pdev)
 283 {
 284         struct net_device *ndev = pci_get_drvdata(pdev);
 285         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 286         int err;
 287
 288         BUG_ON(!priv);
 289
 290         printk(KERN_NOTICE "%s: got resume request\n", ndev->name);
 291
 292         err = pci_enable_device(pdev);
 293         if (err) {
 294                 printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
 295                        ndev->name);
 296                 return err;
 297         }
 298
 299         pci_restore_state(pdev);
 300
 301         /* alright let's go into the PREBOOT state */
 302         islpci_reset(priv, 1);
 303
 304         netif_device_attach(ndev);
 305         netif_start_queue(ndev);
 306
 307         return 0;
 308 }
 309
 310 static int __init
 311 prism54_module_init(void)
 312 {
 313         printk(KERN_INFO "Loaded %s driver, version %s\n",
 314                DRV_NAME, DRV_VERSION);
 315
 316         __bug_on_wrong_struct_sizes ();
 317
 318         return pci_register_driver(&prism54_driver);
 319 }
 320
 321 /* by the time prism54_module_exit() terminates, as a postcondition
 322  * all instances will have been destroyed by calls to
 323  * prism54_remove() */
 324 static void __exit
 325 prism54_module_exit(void)
 326 {
 327         __in_cleanup_module = 1;
 328
 329         pci_unregister_driver(&prism54_driver);
 330
 331         printk(KERN_INFO "Unloaded %s driver\n", DRV_NAME);
 332
 333         __in_cleanup_module = 0;
 334 }
 335
 336 /* register entry points */
 337 module_init(prism54_module_init);
 338 module_exit(prism54_module_exit);
 339 /* EOF */