drivers/net/wireless/orinoco_pci.c

   1 /* orinoco_pci.c
   2  *
   3  * Driver for Prism 2.5/3 devices that have a direct PCI interface
   4  * (i.e. these are not PCMCIA cards in a PCMCIA-to-PCI bridge).
   5  * The card contains only one PCI region, which contains all the usual
   6  * hermes registers, as well as the COR register.
   7  *
   8  * Current maintainers are:
   9  *      Pavel Roskin <proski AT gnu.org>
  10  * and  David Gibson <hermes AT gibson.dropbear.id.au>
  11  *
  12  * Some of this code is borrowed from orinoco_plx.c
  13  *      Copyright (C) 2001 Daniel Barlow <dan AT telent.net>
  14  * Some of this code is "inspired" by linux-wlan-ng-0.1.10, but nothing
  15  * has been copied from it. linux-wlan-ng-0.1.10 is originally :
  16  *      Copyright (C) 1999 AbsoluteValue Systems, Inc.  All Rights Reserved.
  17  * This file originally written by:
  18  *      Copyright (C) 2001 Jean Tourrilhes <jt AT hpl.hp.com>
  19  * And is now maintained by:
  20  *      (C) Copyright David Gibson, IBM Corp. 2002-2003.
  21  *
  22  * The contents of this file are subject to the Mozilla Public License
  23  * Version 1.1 (the "License"); you may not use this file except in
  24  * compliance with the License. You may obtain a copy of the License
  25  * at http://www.mozilla.org/MPL/
  26  *
  27  * Software distributed under the License is distributed on an "AS IS"
  28  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  29  * the License for the specific language governing rights and
  30  * limitations under the License.
  31  *
  32  * Alternatively, the contents of this file may be used under the
  33  * terms of the GNU General Public License version 2 (the "GPL"), in
  34  * which case the provisions of the GPL are applicable instead of the
  35  * above.  If you wish to allow the use of your version of this file
  36  * only under the terms of the GPL and not to allow others to use your
  37  * version of this file under the MPL, indicate your decision by
  38  * deleting the provisions above and replace them with the notice and
  39  * other provisions required by the GPL.  If you do not delete the
  40  * provisions above, a recipient may use your version of this file
  41  * under either the MPL or the GPL.
  42  */
  43
  44 #define DRIVER_NAME "orinoco_pci"
  45 #define PFX DRIVER_NAME ": "
  46
  47 #include <linux/module.h>
  48 #include <linux/kernel.h>
  49 #include <linux/init.h>
  50 #include <linux/delay.h>
  51 #include <linux/pci.h>
  52
  53 #include "orinoco.h"
  54 #include "orinoco_pci.h"
  55
  56 /* Offset of the COR register of the PCI card */
  57 #define HERMES_PCI_COR          (0x26)
  58
  59 /* Bitmask to reset the card */
  60 #define HERMES_PCI_COR_MASK     (0x0080)
  61
  62 /* Magic timeouts for doing the reset.
  63  * Those times are straight from wlan-ng, and it is claimed that they
  64  * are necessary. Alan will kill me. Take your time and grab a coffee. */
  65 #define HERMES_PCI_COR_ONT      (250)           /* ms */
  66 #define HERMES_PCI_COR_OFFT     (500)           /* ms */
  67 #define HERMES_PCI_COR_BUSYT    (500)           /* ms */
  68
  69 /*
  70  * Do a soft reset of the card using the Configuration Option Register
  71  * We need this to get going...
  72  * This is the part of the code that is strongly inspired from wlan-ng
  73  *
  74  * Note : This code is done with irq enabled. This mean that many
  75  * interrupts will occur while we are there. This is why we use the
  76  * jiffies to regulate time instead of a straight mdelay(). Usually we
  77  * need only around 245 iteration of the loop to do 250 ms delay.
  78  *
  79  * Note bis : Don't try to access HERMES_CMD during the reset phase.
  80  * It just won't work !
  81  */
  82 static int orinoco_pci_cor_reset(struct orinoco_private *priv)
  83 {
  84         hermes_t *hw = &priv->hw;
  85         unsigned long timeout;
  86         u16 reg;
  87
  88         /* Assert the reset until the card notices */
  89         hermes_write_regn(hw, PCI_COR, HERMES_PCI_COR_MASK);
  90         mdelay(HERMES_PCI_COR_ONT);
  91
  92         /* Give time for the card to recover from this hard effort */
  93         hermes_write_regn(hw, PCI_COR, 0x0000);
  94         mdelay(HERMES_PCI_COR_OFFT);
  95
  96         /* The card is ready when it's no longer busy */
  97         timeout = jiffies + (HERMES_PCI_COR_BUSYT * HZ / 1000);
  98         reg = hermes_read_regn(hw, CMD);
  99         while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) {
 100                 mdelay(1);
 101                 reg = hermes_read_regn(hw, CMD);
 102         }
 103
 104         /* Still busy? */
 105         if (reg & HERMES_CMD_BUSY) {
 106                 printk(KERN_ERR PFX "Busy timeout\n");
 107                 return -ETIMEDOUT;
 108         }
 109
 110         return 0;
 111 }
 112
 113 static int orinoco_pci_init_one(struct pci_dev *pdev,
 114                                 const struct pci_device_id *ent)
 115 {
 116         int err;
 117         struct orinoco_private *priv;
 118         struct orinoco_pci_card *card;
 119         struct net_device *dev;
 120         void __iomem *hermes_io;
 121
 122         err = pci_enable_device(pdev);
 123         if (err) {
 124                 printk(KERN_ERR PFX "Cannot enable PCI device\n");
 125                 return err;
 126         }
 127
 128         err = pci_request_regions(pdev, DRIVER_NAME);
 129         if (err) {
 130                 printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
 131                 goto fail_resources;
 132         }
 133
 134         hermes_io = pci_iomap(pdev, 0, 0);
 135         if (!hermes_io) {
 136                 printk(KERN_ERR PFX "Cannot remap chipset registers\n");
 137                 err = -EIO;
 138                 goto fail_map_hermes;
 139         }
 140
 141         /* Allocate network device */
 142         dev = alloc_orinocodev(sizeof(*card), orinoco_pci_cor_reset);
 143         if (!dev) {
 144                 printk(KERN_ERR PFX "Cannot allocate network device\n");
 145                 err = -ENOMEM;
 146                 goto fail_alloc;
 147         }
 148
 149         priv = netdev_priv(dev);
 150         card = priv->card;
 151         SET_NETDEV_DEV(dev, &pdev->dev);
 152
 153         hermes_struct_init(&priv->hw, hermes_io, HERMES_32BIT_REGSPACING);
 154
 155         err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
 156                           dev->name, dev);
 157         if (err) {
 158                 printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
 159                 err = -EBUSY;
 160                 goto fail_irq;
 161         }
 162
 163         err = orinoco_pci_cor_reset(priv);
 164         if (err) {
 165                 printk(KERN_ERR PFX "Initial reset failed\n");
 166                 goto fail;
 167         }
 168
 169         err = register_netdev(dev);
 170         if (err) {
 171                 printk(KERN_ERR PFX "Cannot register network device\n");
 172                 goto fail;
 173         }
 174
 175         pci_set_drvdata(pdev, dev);
 176         printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s\n", dev->name,
 177                pci_name(pdev));
 178
 179         return 0;
 180
 181  fail:
 182         free_irq(pdev->irq, dev);
 183
 184  fail_irq:
 185         pci_set_drvdata(pdev, NULL);
 186         free_orinocodev(dev);
 187
 188  fail_alloc:
 189         pci_iounmap(pdev, hermes_io);
 190
 191  fail_map_hermes:
 192         pci_release_regions(pdev);
 193
 194  fail_resources:
 195         pci_disable_device(pdev);
 196
 197         return err;
 198 }
 199
 200 static void __devexit orinoco_pci_remove_one(struct pci_dev *pdev)
 201 {
 202         struct net_device *dev = pci_get_drvdata(pdev);
 203         struct orinoco_private *priv = netdev_priv(dev);
 204
 205         unregister_netdev(dev);
 206         free_irq(pdev->irq, dev);
 207         pci_set_drvdata(pdev, NULL);
 208         free_orinocodev(dev);
 209         pci_iounmap(pdev, priv->hw.iobase);
 210         pci_release_regions(pdev);
 211         pci_disable_device(pdev);
 212 }
 213
 214 static struct pci_device_id orinoco_pci_id_table[] = {
 215         /* Intersil Prism 3 */
 216         {0x1260, 0x3872, PCI_ANY_ID, PCI_ANY_ID,},
 217         /* Intersil Prism 2.5 */
 218         {0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
 219         /* Samsung MagicLAN SWL-2210P */
 220         {0x167d, 0xa000, PCI_ANY_ID, PCI_ANY_ID,},
 221         {0,},
 222 };
 223
 224 MODULE_DEVICE_TABLE(pci, orinoco_pci_id_table);
 225
 226 static struct pci_driver orinoco_pci_driver = {
 227         .name           = DRIVER_NAME,
 228         .id_table       = orinoco_pci_id_table,
 229         .probe          = orinoco_pci_init_one,
 230         .remove         = __devexit_p(orinoco_pci_remove_one),
 231         .suspend        = orinoco_pci_suspend,
 232         .resume         = orinoco_pci_resume,
 233 };
 234
 235 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 236         " (Pavel Roskin <proski@gnu.org>,"
 237         " David Gibson <hermes@gibson.dropbear.id.au> &"
 238         " Jean Tourrilhes <jt@hpl.hp.com>)";
 239 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> & David Gibson <hermes@gibson.dropbear.id.au>");
 240 MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
 241 MODULE_LICENSE("Dual MPL/GPL");
 242
 243 static int __init orinoco_pci_init(void)
 244 {
 245         printk(KERN_DEBUG "%s\n", version);
 246         return pci_register_driver(&orinoco_pci_driver);
 247 }
 248
 249 static void __exit orinoco_pci_exit(void)
 250 {
 251         pci_unregister_driver(&orinoco_pci_driver);
 252 }
 253
 254 module_init(orinoco_pci_init);
 255 module_exit(orinoco_pci_exit);
 256
 257 /*
 258  * Local variables:
 259  *  c-indent-level: 8
 260  *  c-basic-offset: 8
 261  *  tab-width: 8
 262  * End:
 263  */