drivers/net/wireless/orinoco_pci.c

   1 /* orinoco_pci.c
   2  *
   3  * Driver for Prism II devices that have a direct PCI interface
   4  * (i.e., not in a Pcmcia or PLX bridge)
   5  *
   6  * Specifically here we're talking about the Linksys WMP11
   7  *
   8  * Current maintainers (as of 29 September 2003) 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 /*
  45  * Theory of operation...
  46  * -------------------
  47  * Maybe you had a look in orinoco_plx. Well, this is totally different...
  48  *
  49  * The card contains only one PCI region, which contains all the usual
  50  * hermes registers.
  51  *
  52  * The driver will memory map this region in normal memory. Because
  53  * the hermes registers are mapped in normal memory and not in ISA I/O
  54  * post space, we can't use the usual inw/outw macros and we need to
  55  * use readw/writew.
  56  * This slight difference force us to compile our own version of
  57  * hermes.c with the register access macro changed. That's a bit
  58  * hackish but works fine.
  59  *
  60  * Note that the PCI region is pretty big (4K). That's much more than
  61  * the usual set of hermes register (0x0 -> 0x3E). I've got a strong
  62  * suspicion that the whole memory space of the adapter is in fact in
  63  * this region. Accessing directly the adapter memory instead of going
  64  * through the usual register would speed up significantely the
  65  * operations...
  66  *
  67  * Finally, the card looks like this :
  68 -----------------------
  69   Bus  0, device  14, function  0:
  70     Network controller: PCI device 1260:3873 (Harris Semiconductor) (rev 1).
  71       IRQ 11.
  72       Master Capable.  Latency=248.
  73       Prefetchable 32 bit memory at 0xffbcc000 [0xffbccfff].
  74 -----------------------
  75 00:0e.0 Network controller: Harris Semiconductor: Unknown device 3873 (rev 01)
  76         Subsystem: Unknown device 1737:3874
  77         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
  78         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
  79         Latency: 248 set, cache line size 08
  80         Interrupt: pin A routed to IRQ 11
  81         Region 0: Memory at ffbcc000 (32-bit, prefetchable) [size=4K]
  82         Capabilities: [dc] Power Management version 2
  83                 Flags: PMEClk- AuxPwr- DSI- D1+ D2+ PME+
  84                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
  85 -----------------------
  86  *
  87  * That's all..
  88  *
  89  * Jean II
  90  */
  91
  92 #define DRIVER_NAME "orinoco_pci"
  93 #define PFX DRIVER_NAME ": "
  94
  95 #include <linux/config.h>
  96 #include <linux/module.h>
  97 #include <linux/kernel.h>
  98 #include <linux/init.h>
  99 #include <linux/delay.h>
 100 #include <linux/pci.h>
 101
 102 #include "orinoco.h"
 103
 104 /* All the magic there is from wlan-ng */
 105 /* Magic offset of the reset register of the PCI card */
 106 #define HERMES_PCI_COR          (0x26)
 107 /* Magic bitmask to reset the card */
 108 #define HERMES_PCI_COR_MASK     (0x0080)
 109 /* Magic timeouts for doing the reset.
 110  * Those times are straight from wlan-ng, and it is claimed that they
 111  * are necessary. Alan will kill me. Take your time and grab a coffee. */
 112 #define HERMES_PCI_COR_ONT      (250)           /* ms */
 113 #define HERMES_PCI_COR_OFFT     (500)           /* ms */
 114 #define HERMES_PCI_COR_BUSYT    (500)           /* ms */
 115
 116 /* Orinoco PCI specific data */
 117 struct orinoco_pci_card {
 118         void __iomem *pci_ioaddr;
 119 };
 120
 121 /*
 122  * Do a soft reset of the PCI card using the Configuration Option Register
 123  * We need this to get going...
 124  * This is the part of the code that is strongly inspired from wlan-ng
 125  *
 126  * Note : This code is done with irq enabled. This mean that many
 127  * interrupts will occur while we are there. This is why we use the
 128  * jiffies to regulate time instead of a straight mdelay(). Usually we
 129  * need only around 245 iteration of the loop to do 250 ms delay.
 130  *
 131  * Note bis : Don't try to access HERMES_CMD during the reset phase.
 132  * It just won't work !
 133  */
 134 static int
 135 orinoco_pci_cor_reset(struct orinoco_private *priv)
 136 {
 137         hermes_t *hw = &priv->hw;
 138         unsigned long   timeout;
 139         u16     reg;
 140
 141         /* Assert the reset until the card notice */
 142         hermes_write_regn(hw, PCI_COR, HERMES_PCI_COR_MASK);
 143         mdelay(HERMES_PCI_COR_ONT);
 144
 145         /* Give time for the card to recover from this hard effort */
 146         hermes_write_regn(hw, PCI_COR, 0x0000);
 147         mdelay(HERMES_PCI_COR_OFFT);
 148
 149         /* The card is ready when it's no longer busy */
 150         timeout = jiffies + (HERMES_PCI_COR_BUSYT * HZ / 1000);
 151         reg = hermes_read_regn(hw, CMD);
 152         while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) {
 153                 mdelay(1);
 154                 reg = hermes_read_regn(hw, CMD);
 155         }
 156
 157         /* Still busy? */
 158         if (reg & HERMES_CMD_BUSY) {
 159                 printk(KERN_ERR PFX "Busy timeout\n");
 160                 return -ETIMEDOUT;
 161         }
 162
 163         return 0;
 164 }
 165
 166 /*
 167  * Initialise a card. Mostly similar to PLX code.
 168  */
 169 static int orinoco_pci_init_one(struct pci_dev *pdev,
 170                                 const struct pci_device_id *ent)
 171 {
 172         int err = 0;
 173         unsigned long pci_iorange;
 174         u16 __iomem *pci_ioaddr = NULL;
 175         unsigned long pci_iolen;
 176         struct orinoco_private *priv = NULL;
 177         struct orinoco_pci_card *card;
 178         struct net_device *dev = NULL;
 179
 180         err = pci_enable_device(pdev);
 181         if (err) {
 182                 printk(KERN_ERR PFX "Cannot enable PCI device\n");
 183                 return err;
 184         }
 185
 186         err = pci_request_regions(pdev, DRIVER_NAME);
 187         if (err != 0) {
 188                 printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
 189                 goto fail_resources;
 190         }
 191
 192         /* Resource 0 is mapped to the hermes registers */
 193         pci_iorange = pci_resource_start(pdev, 0);
 194         pci_iolen = pci_resource_len(pdev, 0);
 195         pci_ioaddr = ioremap(pci_iorange, pci_iolen);
 196         if (!pci_iorange) {
 197                 printk(KERN_ERR PFX "Cannot remap hardware registers\n");
 198                 goto fail_map;
 199         }
 200
 201         /* Allocate network device */
 202         dev = alloc_orinocodev(sizeof(*card), orinoco_pci_cor_reset);
 203         if (! dev) {
 204                 err = -ENOMEM;
 205                 goto fail_alloc;
 206         }
 207
 208         priv = netdev_priv(dev);
 209         card = priv->card;
 210         card->pci_ioaddr = pci_ioaddr;
 211         dev->mem_start = pci_iorange;
 212         dev->mem_end = pci_iorange + pci_iolen - 1;
 213         SET_MODULE_OWNER(dev);
 214         SET_NETDEV_DEV(dev, &pdev->dev);
 215
 216         hermes_struct_init(&priv->hw, pci_ioaddr, HERMES_32BIT_REGSPACING);
 217
 218         printk(KERN_DEBUG PFX "Detected device %s, mem:0x%lx-0x%lx, irq %d\n",
 219                pci_name(pdev), dev->mem_start, dev->mem_end, pdev->irq);
 220
 221         err = request_irq(pdev->irq, orinoco_interrupt, SA_SHIRQ,
 222                           dev->name, dev);
 223         if (err) {
 224                 printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
 225                 err = -EBUSY;
 226                 goto fail_irq;
 227         }
 228         dev->irq = pdev->irq;
 229
 230         /* Perform a COR reset to start the card */
 231         err = orinoco_pci_cor_reset(priv);
 232         if (err) {
 233                 printk(KERN_ERR PFX "Initial reset failed\n");
 234                 goto fail;
 235         }
 236
 237         err = register_netdev(dev);
 238         if (err) {
 239                 printk(KERN_ERR PFX "Failed to register net device\n");
 240                 goto fail;
 241         }
 242
 243         pci_set_drvdata(pdev, dev);
 244
 245         return 0;
 246
 247  fail:
 248         free_irq(pdev->irq, dev);
 249
 250  fail_irq:
 251         pci_set_drvdata(pdev, NULL);
 252         free_orinocodev(dev);
 253
 254  fail_alloc:
 255         iounmap(pci_ioaddr);
 256
 257  fail_map:
 258         pci_release_regions(pdev);
 259
 260  fail_resources:
 261         pci_disable_device(pdev);
 262
 263         return err;
 264 }
 265
 266 static void __devexit orinoco_pci_remove_one(struct pci_dev *pdev)
 267 {
 268         struct net_device *dev = pci_get_drvdata(pdev);
 269         struct orinoco_private *priv = netdev_priv(dev);
 270         struct orinoco_pci_card *card = priv->card;
 271
 272         unregister_netdev(dev);
 273         free_irq(dev->irq, dev);
 274         pci_set_drvdata(pdev, NULL);
 275         free_orinocodev(dev);
 276         iounmap(card->pci_ioaddr);
 277         pci_release_regions(pdev);
 278         pci_disable_device(pdev);
 279 }
 280
 281 static int orinoco_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 282 {
 283         struct net_device *dev = pci_get_drvdata(pdev);
 284         struct orinoco_private *priv = netdev_priv(dev);
 285         unsigned long flags;
 286         int err;
 287
 288
 289         err = orinoco_lock(priv, &flags);
 290         if (err) {
 291                 printk(KERN_ERR "%s: hw_unavailable on orinoco_pci_suspend\n",
 292                        dev->name);
 293                 return err;
 294         }
 295
 296         err = __orinoco_down(dev);
 297         if (err)
 298                 printk(KERN_WARNING "%s: orinoco_pci_suspend(): Error %d downing interface\n",
 299                        dev->name, err);
 300
 301         netif_device_detach(dev);
 302
 303         priv->hw_unavailable++;
 304
 305         orinoco_unlock(priv, &flags);
 306
 307         free_irq(pdev->irq, dev);
 308         pci_save_state(pdev);
 309         pci_disable_device(pdev);
 310         pci_set_power_state(pdev, PCI_D3hot);
 311
 312         return 0;
 313 }
 314
 315 static int orinoco_pci_resume(struct pci_dev *pdev)
 316 {
 317         struct net_device *dev = pci_get_drvdata(pdev);
 318         struct orinoco_private *priv = netdev_priv(dev);
 319         unsigned long flags;
 320         int err;
 321
 322         printk(KERN_DEBUG "%s: Orinoco-PCI waking up\n", dev->name);
 323
 324         pci_set_power_state(pdev, 0);
 325         pci_enable_device(pdev);
 326         pci_restore_state(pdev);
 327
 328         err = request_irq(pdev->irq, orinoco_interrupt, SA_SHIRQ,
 329                           dev->name, dev);
 330         if (err) {
 331                 printk(KERN_ERR "%s: Cannot re-allocate IRQ\n", dev->name);
 332                 pci_disable_device(pdev);
 333                 return -EBUSY;
 334         }
 335
 336         err = orinoco_reinit_firmware(dev);
 337         if (err) {
 338                 printk(KERN_ERR "%s: Error %d re-initializing firmware on orinoco_pci_resume()\n",
 339                        dev->name, err);
 340                 return err;
 341         }
 342
 343         spin_lock_irqsave(&priv->lock, flags);
 344
 345         netif_device_attach(dev);
 346
 347         priv->hw_unavailable--;
 348
 349         if (priv->open && (! priv->hw_unavailable)) {
 350                 err = __orinoco_up(dev);
 351                 if (err)
 352                         printk(KERN_ERR "%s: Error %d restarting card on orinoco_pci_resume()\n",
 353                                dev->name, err);
 354         }
 355
 356         spin_unlock_irqrestore(&priv->lock, flags);
 357
 358         return 0;
 359 }
 360
 361 static struct pci_device_id orinoco_pci_pci_id_table[] = {
 362         /* Intersil Prism 3 */
 363         {0x1260, 0x3872, PCI_ANY_ID, PCI_ANY_ID,},
 364         /* Intersil Prism 2.5 */
 365         {0x1260, 0x3873, PCI_ANY_ID, PCI_ANY_ID,},
 366         /* Samsung MagicLAN SWL-2210P */
 367         {0x167d, 0xa000, PCI_ANY_ID, PCI_ANY_ID,},
 368         {0,},
 369 };
 370
 371 MODULE_DEVICE_TABLE(pci, orinoco_pci_pci_id_table);
 372
 373 static struct pci_driver orinoco_pci_driver = {
 374         .name           = DRIVER_NAME,
 375         .id_table       = orinoco_pci_pci_id_table,
 376         .probe          = orinoco_pci_init_one,
 377         .remove         = __devexit_p(orinoco_pci_remove_one),
 378         .suspend        = orinoco_pci_suspend,
 379         .resume         = orinoco_pci_resume,
 380 };
 381
 382 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 383         " (Pavel Roskin <proski@gnu.org>,"
 384         " David Gibson <hermes@gibson.dropbear.id.au> &"
 385         " Jean Tourrilhes <jt@hpl.hp.com>)";
 386 MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> & David Gibson <hermes@gibson.dropbear.id.au>");
 387 MODULE_DESCRIPTION("Driver for wireless LAN cards using direct PCI interface");
 388 MODULE_LICENSE("Dual MPL/GPL");
 389
 390 static int __init orinoco_pci_init(void)
 391 {
 392         printk(KERN_DEBUG "%s\n", version);
 393         return pci_module_init(&orinoco_pci_driver);
 394 }
 395
 396 static void __exit orinoco_pci_exit(void)
 397 {
 398         pci_unregister_driver(&orinoco_pci_driver);
 399 }
 400
 401 module_init(orinoco_pci_init);
 402 module_exit(orinoco_pci_exit);
 403
 404 /*
 405  * Local variables:
 406  *  c-indent-level: 8
 407  *  c-basic-offset: 8
 408  *  tab-width: 8
 409  * End:
 410  */