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Linux/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         struct hermes *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 + msecs_to_jiffies(HERMES_PCI_COR_BUSYT);
 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, NULL);
174         if (err) {
175                 printk(KERN_ERR PFX "orinoco_if_add() failed\n");
176                 goto fail_wiphy;
177         }
178 
179         pci_set_drvdata(pdev, priv);
180 
181         return 0;
182 
183  fail_wiphy:
184         wiphy_unregister(priv_to_wiphy(priv));
185  fail:
186         free_irq(pdev->irq, priv);
187 
188  fail_irq:
189         free_orinocodev(priv);
190 
191  fail_alloc:
192         pci_iounmap(pdev, hermes_io);
193 
194  fail_map_hermes:
195         pci_release_regions(pdev);
196 
197  fail_resources:
198         pci_disable_device(pdev);
199 
200         return err;
201 }
202 
203 static void orinoco_pci_remove_one(struct pci_dev *pdev)
204 {
205         struct orinoco_private *priv = pci_get_drvdata(pdev);
206 
207         orinoco_if_del(priv);
208         wiphy_unregister(priv_to_wiphy(priv));
209         free_irq(pdev->irq, priv);
210         free_orinocodev(priv);
211         pci_iounmap(pdev, priv->hw.iobase);
212         pci_release_regions(pdev);
213         pci_disable_device(pdev);
214 }
215 
216 static const struct pci_device_id orinoco_pci_id_table[] = {
217         /* Intersil Prism 3 */
218         {0x1260, 0x3872, PCI_ANY_ID, PCI_ANY_ID,},
219         /* Intersil Prism 2.5 */
220         {0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
221         /* Samsung MagicLAN SWL-2210P */
222         {0x167d, 0xa000, PCI_ANY_ID, PCI_ANY_ID,},
223         {0,},
224 };
225 
226 MODULE_DEVICE_TABLE(pci, orinoco_pci_id_table);
227 
228 static struct pci_driver orinoco_pci_driver = {
229         .name           = DRIVER_NAME,
230         .id_table       = orinoco_pci_id_table,
231         .probe          = orinoco_pci_init_one,
232         .remove         = orinoco_pci_remove_one,
233         .suspend        = orinoco_pci_suspend,
234         .resume         = orinoco_pci_resume,
235 };
236 
237 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
238         " (Pavel Roskin <proski@gnu.org>,"
239         " David Gibson <hermes@gibson.dropbear.id.au> &"
240         " Jean Tourrilhes <jt@hpl.hp.com>)";
241 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> &"
242               " David Gibson <hermes@gibson.dropbear.id.au>");
243 MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
244 MODULE_LICENSE("Dual MPL/GPL");
245 
246 static int __init orinoco_pci_init(void)
247 {
248         printk(KERN_DEBUG "%s\n", version);
249         return pci_register_driver(&orinoco_pci_driver);
250 }
251 
252 static void __exit orinoco_pci_exit(void)
253 {
254         pci_unregister_driver(&orinoco_pci_driver);
255 }
256 
257 module_init(orinoco_pci_init);
258 module_exit(orinoco_pci_exit);
259 
260 /*
261  * Local variables:
262  *  c-indent-level: 8
263  *  c-basic-offset: 8
264  *  tab-width: 8
265  * End:
266  */
267 

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