drivers/net/wireless/orinoco/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         void __iomem *hermes_io;
 120
 121         err = pci_enable_device(pdev);
 122         if (err) {
 123                 printk(KERN_ERR PFX "Cannot enable PCI device\n");
 124                 return err;
 125         }
 126
 127         err = pci_request_regions(pdev, DRIVER_NAME);
 128         if (err) {
 129                 printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
 130                 goto fail_resources;
 131         }
 132
 133         hermes_io = pci_iomap(pdev, 0, 0);
 134         if (!hermes_io) {
 135                 printk(KERN_ERR PFX "Cannot remap chipset registers\n");
 136                 err = -EIO;
 137                 goto fail_map_hermes;
 138         }
 139
 140         /* Allocate network device */
 141         priv = alloc_orinocodev(sizeof(*card), &pdev->dev,
 142                                 orinoco_pci_cor_reset, NULL);
 143         if (!priv) {
 144                 printk(KERN_ERR PFX "Cannot allocate network device\n");
 145                 err = -ENOMEM;
 146                 goto fail_alloc;
 147         }
 148
 149         card = priv->card;
 150
 151         hermes_struct_init(&priv->hw, hermes_io, HERMES_32BIT_REGSPACING);
 152
 153         err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
 154                           DRIVER_NAME, priv);
 155         if (err) {
 156                 printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
 157                 err = -EBUSY;
 158                 goto fail_irq;
 159         }
 160
 161         err = orinoco_pci_cor_reset(priv);
 162         if (err) {
 163                 printk(KERN_ERR PFX "Initial reset failed\n");
 164                 goto fail;
 165         }
 166
 167         err = orinoco_init(priv);
 168         if (err) {
 169                 printk(KERN_ERR PFX "orinoco_init() failed\n");
 170                 goto fail;
 171         }
 172
 173         err = orinoco_if_add(priv, 0, 0);
 174         if (err) {
 175                 printk(KERN_ERR PFX "orinoco_if_add() failed\n");
 176                 goto fail;
 177         }
 178
 179         pci_set_drvdata(pdev, priv);
 180
 181         return 0;
 182
 183  fail:
 184         free_irq(pdev->irq, priv);
 185
 186  fail_irq:
 187         pci_set_drvdata(pdev, NULL);
 188         free_orinocodev(priv);
 189
 190  fail_alloc:
 191         pci_iounmap(pdev, hermes_io);
 192
 193  fail_map_hermes:
 194         pci_release_regions(pdev);
 195
 196  fail_resources:
 197         pci_disable_device(pdev);
 198
 199         return err;
 200 }
 201
 202 static void __devexit orinoco_pci_remove_one(struct pci_dev *pdev)
 203 {
 204         struct orinoco_private *priv = pci_get_drvdata(pdev);
 205
 206         orinoco_if_del(priv);
 207         free_irq(pdev->irq, priv);
 208         pci_set_drvdata(pdev, NULL);
 209         free_orinocodev(priv);
 210         pci_iounmap(pdev, priv->hw.iobase);
 211         pci_release_regions(pdev);
 212         pci_disable_device(pdev);
 213 }
 214
 215 static struct pci_device_id orinoco_pci_id_table[] = {
 216         /* Intersil Prism 3 */
 217         {0x1260, 0x3872, PCI_ANY_ID, PCI_ANY_ID,},
 218         /* Intersil Prism 2.5 */
 219         {0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
 220         /* Samsung MagicLAN SWL-2210P */
 221         {0x167d, 0xa000, PCI_ANY_ID, PCI_ANY_ID,},
 222         {0,},
 223 };
 224
 225 MODULE_DEVICE_TABLE(pci, orinoco_pci_id_table);
 226
 227 static struct pci_driver orinoco_pci_driver = {
 228         .name           = DRIVER_NAME,
 229         .id_table       = orinoco_pci_id_table,
 230         .probe          = orinoco_pci_init_one,
 231         .remove         = __devexit_p(orinoco_pci_remove_one),
 232         .suspend        = orinoco_pci_suspend,
 233         .resume         = orinoco_pci_resume,
 234 };
 235
 236 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 237         " (Pavel Roskin <proski@gnu.org>,"
 238         " David Gibson <hermes@gibson.dropbear.id.au> &"
 239         " Jean Tourrilhes <jt@hpl.hp.com>)";
 240 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> &"
 241               " David Gibson <hermes@gibson.dropbear.id.au>");
 242 MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
 243 MODULE_LICENSE("Dual MPL/GPL");
 244
 245 static int __init orinoco_pci_init(void)
 246 {
 247         printk(KERN_DEBUG "%s\n", version);
 248         return pci_register_driver(&orinoco_pci_driver);
 249 }
 250
 251 static void __exit orinoco_pci_exit(void)
 252 {
 253         pci_unregister_driver(&orinoco_pci_driver);
 254 }
 255
 256 module_init(orinoco_pci_init);
 257 module_exit(orinoco_pci_exit);
 258
 259 /*
 260  * Local variables:
 261  *  c-indent-level: 8
 262  *  c-basic-offset: 8
 263  *  tab-width: 8
 264  * End:
 265  */