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, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19
  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://prism54.org/supported_cards.php */
  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          0x10b7, 0x6001,
  53          PCI_ANY_ID, PCI_ANY_ID,
  54          0, 0, 0
  55         },
  56
  57         /* Intersil PRISM Indigo Wireless LAN adapter */
  58         {
  59          0x1260, 0x3877,
  60          PCI_ANY_ID, PCI_ANY_ID,
  61          0, 0, 0
  62         },
  63
  64         /* Intersil PRISM Javelin/Xbow Wireless LAN adapter */
  65         {
  66          0x1260, 0x3886,
  67          PCI_ANY_ID, PCI_ANY_ID,
  68          0, 0, 0
  69         },
  70
  71         /* End of list */
  72         {0,0,0,0,0,0,0}
  73 };
  74
  75 /* register the device with the Hotplug facilities of the kernel */
  76 MODULE_DEVICE_TABLE(pci, prism54_id_tbl);
  77
  78 static int prism54_probe(struct pci_dev *, const struct pci_device_id *);
  79 static void prism54_remove(struct pci_dev *);
  80 static int prism54_suspend(struct pci_dev *, pm_message_t state);
  81 static int prism54_resume(struct pci_dev *);
  82
  83 static struct pci_driver prism54_driver = {
  84         .name = DRV_NAME,
  85         .id_table = prism54_id_tbl,
  86         .probe = prism54_probe,
  87         .remove = prism54_remove,
  88         .suspend = prism54_suspend,
  89         .resume = prism54_resume,
  90 };
  91
  92 /******************************************************************************
  93     Module initialization functions
  94 ******************************************************************************/
  95
  96 int
  97 prism54_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  98 {
  99         struct net_device *ndev;
 100         u8 latency_tmr;
 101         u32 mem_addr;
 102         islpci_private *priv;
 103         int rvalue;
 104
 105         /* Enable the pci device */
 106         if (pci_enable_device(pdev)) {
 107                 printk(KERN_ERR "%s: pci_enable_device() failed.\n", DRV_NAME);
 108                 return -ENODEV;
 109         }
 110
 111         /* check whether the latency timer is set correctly */
 112         pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency_tmr);
 113 #if VERBOSE > SHOW_ERROR_MESSAGES
 114         DEBUG(SHOW_TRACING, "latency timer: %x\n", latency_tmr);
 115 #endif
 116         if (latency_tmr < PCIDEVICE_LATENCY_TIMER_MIN) {
 117                 /* set the latency timer */
 118                 pci_write_config_byte(pdev, PCI_LATENCY_TIMER,
 119                                       PCIDEVICE_LATENCY_TIMER_VAL);
 120         }
 121
 122         /* enable PCI DMA */
 123         if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
 124                 printk(KERN_ERR "%s: 32-bit PCI DMA not supported", DRV_NAME);
 125                 goto do_pci_disable_device;
 126         }
 127
 128         /* 0x40 is the programmable timer to configure the response timeout (TRDY_TIMEOUT)
 129          * 0x41 is the programmable timer to configure the retry timeout (RETRY_TIMEOUT)
 130          *      The RETRY_TIMEOUT is used to set the number of retries that the core, as a
 131          *      Master, will perform before abandoning a cycle. The default value for
 132          *      RETRY_TIMEOUT is 0x80, which far exceeds the PCI 2.1 requirement for new
 133          *      devices. A write of zero to the RETRY_TIMEOUT register disables this
 134          *      function to allow use with any non-compliant legacy devices that may
 135          *      execute more retries.
 136          *
 137          *      Writing zero to both these two registers will disable both timeouts and
 138          *      *can* solve problems caused by devices that are slow to respond.
 139          *      Make this configurable - MSW
 140          */
 141         if ( init_pcitm >= 0 ) {
 142                 pci_write_config_byte(pdev, 0x40, (u8)init_pcitm);
 143                 pci_write_config_byte(pdev, 0x41, (u8)init_pcitm);
 144         } else {
 145                 printk(KERN_INFO "PCI TRDY/RETRY unchanged\n");
 146         }
 147
 148         /* request the pci device I/O regions */
 149         rvalue = pci_request_regions(pdev, DRV_NAME);
 150         if (rvalue) {
 151                 printk(KERN_ERR "%s: pci_request_regions failure (rc=%d)\n",
 152                        DRV_NAME, rvalue);
 153                 goto do_pci_disable_device;
 154         }
 155
 156         /* check if the memory window is indeed set */
 157         rvalue = pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &mem_addr);
 158         if (rvalue || !mem_addr) {
 159                 printk(KERN_ERR "%s: PCI device memory region not configured; fix your BIOS or CardBus bridge/drivers\n",
 160                        DRV_NAME);
 161                 goto do_pci_release_regions;
 162         }
 163
 164         /* enable PCI bus-mastering */
 165         DEBUG(SHOW_TRACING, "%s: pci_set_master(pdev)\n", DRV_NAME);
 166         pci_set_master(pdev);
 167
 168         /* enable MWI */
 169         pci_try_set_mwi(pdev);
 170
 171         /* setup the network device interface and its structure */
 172         if (!(ndev = islpci_setup(pdev))) {
 173                 /* error configuring the driver as a network device */
 174                 printk(KERN_ERR "%s: could not configure network device\n",
 175                        DRV_NAME);
 176                 goto do_pci_clear_mwi;
 177         }
 178
 179         priv = netdev_priv(ndev);
 180         islpci_set_state(priv, PRV_STATE_PREBOOT); /* we are attempting to boot */
 181
 182         /* card is in unknown state yet, might have some interrupts pending */
 183         isl38xx_disable_interrupts(priv->device_base);
 184
 185         /* request for the interrupt before uploading the firmware */
 186         rvalue = request_irq(pdev->irq, &islpci_interrupt,
 187                              IRQF_SHARED, ndev->name, priv);
 188
 189         if (rvalue) {
 190                 /* error, could not hook the handler to the irq */
 191                 printk(KERN_ERR "%s: could not install IRQ handler\n",
 192                        ndev->name);
 193                 goto do_unregister_netdev;
 194         }
 195
 196         /* firmware upload is triggered in islpci_open */
 197
 198         return 0;
 199
 200       do_unregister_netdev:
 201         unregister_netdev(ndev);
 202         islpci_free_memory(priv);
 203         pci_set_drvdata(pdev, NULL);
 204         free_netdev(ndev);
 205         priv = NULL;
 206       do_pci_clear_mwi:
 207         pci_clear_mwi(pdev);
 208       do_pci_release_regions:
 209         pci_release_regions(pdev);
 210       do_pci_disable_device:
 211         pci_disable_device(pdev);
 212         return -EIO;
 213 }
 214
 215 /* set by cleanup_module */
 216 static volatile int __in_cleanup_module = 0;
 217
 218 /* this one removes one(!!) instance only */
 219 void
 220 prism54_remove(struct pci_dev *pdev)
 221 {
 222         struct net_device *ndev = pci_get_drvdata(pdev);
 223         islpci_private *priv = ndev ? netdev_priv(ndev) : NULL;
 224         BUG_ON(!priv);
 225
 226         if (!__in_cleanup_module) {
 227                 printk(KERN_DEBUG "%s: hot unplug detected\n", ndev->name);
 228                 islpci_set_state(priv, PRV_STATE_OFF);
 229         }
 230
 231         printk(KERN_DEBUG "%s: removing device\n", ndev->name);
 232
 233         unregister_netdev(ndev);
 234
 235         /* free the interrupt request */
 236
 237         if (islpci_get_state(priv) != PRV_STATE_OFF) {
 238                 isl38xx_disable_interrupts(priv->device_base);
 239                 islpci_set_state(priv, PRV_STATE_OFF);
 240                 /* This bellow causes a lockup at rmmod time. It might be
 241                  * because some interrupts still linger after rmmod time,
 242                  * see bug #17 */
 243                 /* pci_set_power_state(pdev, 3);*/      /* try to power-off */
 244         }
 245
 246         free_irq(pdev->irq, priv);
 247
 248         /* free the PCI memory and unmap the remapped page */
 249         islpci_free_memory(priv);
 250
 251         pci_set_drvdata(pdev, NULL);
 252         free_netdev(ndev);
 253         priv = NULL;
 254
 255         pci_clear_mwi(pdev);
 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         int err;
 291
 292         BUG_ON(!priv);
 293
 294         printk(KERN_NOTICE "%s: got resume request\n", ndev->name);
 295
 296         err = pci_enable_device(pdev);
 297         if (err) {
 298                 printk(KERN_ERR "%s: pci_enable_device failed on resume\n",
 299                        ndev->name);
 300                 return err;
 301         }
 302
 303         pci_restore_state(pdev);
 304
 305         /* alright let's go into the PREBOOT state */
 306         islpci_reset(priv, 1);
 307
 308         netif_device_attach(ndev);
 309         netif_start_queue(ndev);
 310
 311         return 0;
 312 }
 313
 314 static int __init
 315 prism54_module_init(void)
 316 {
 317         printk(KERN_INFO "Loaded %s driver, version %s\n",
 318                DRV_NAME, DRV_VERSION);
 319
 320         __bug_on_wrong_struct_sizes ();
 321
 322         return pci_register_driver(&prism54_driver);
 323 }
 324
 325 /* by the time prism54_module_exit() terminates, as a postcondition
 326  * all instances will have been destroyed by calls to
 327  * prism54_remove() */
 328 static void __exit
 329 prism54_module_exit(void)
 330 {
 331         __in_cleanup_module = 1;
 332
 333         pci_unregister_driver(&prism54_driver);
 334
 335         printk(KERN_INFO "Unloaded %s driver\n", DRV_NAME);
 336
 337         __in_cleanup_module = 0;
 338 }
 339
 340 /* register entry points */
 341 module_init(prism54_module_init);
 342 module_exit(prism54_module_exit);
 343 /* EOF */