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orinoco_pci.c
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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 */
91 
92  /* Give time for the card to recover from this hard effort */
93  hermes_write_regn(hw, PCI_COR, 0x0000);
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 
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;
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 DEFINE_PCI_DEVICE_TABLE(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 <[email protected]>,"
238  " David Gibson <[email protected]> &"
239  " Jean Tourrilhes <[email protected]>)";
240 MODULE_AUTHOR("Pavel Roskin <[email protected]> &"
241  " David Gibson <[email protected]>");
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  */