drivers/net/wireless/orinoco/orinoco_plx.c

   1 /* orinoco_plx.c
   2  *
   3  * Driver for Prism II devices which would usually be driven by orinoco_cs,
   4  * but are connected to the PCI bus by a PLX9052.
   5  *
   6  * Current maintainers are:
   7  *      Pavel Roskin <proski AT gnu.org>
   8  * and  David Gibson <hermes AT gibson.dropbear.id.au>
   9  *
  10  * (C) Copyright David Gibson, IBM Corp. 2001-2003.
  11  * Copyright (C) 2001 Daniel Barlow
  12  *
  13  * The contents of this file are subject to the Mozilla Public License
  14  * Version 1.1 (the "License"); you may not use this file except in
  15  * compliance with the License. You may obtain a copy of the License
  16  * at http://www.mozilla.org/MPL/
  17  *
  18  * Software distributed under the License is distributed on an "AS IS"
  19  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  20  * the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * Alternatively, the contents of this file may be used under the
  24  * terms of the GNU General Public License version 2 (the "GPL"), in
  25  * which case the provisions of the GPL are applicable instead of the
  26  * above.  If you wish to allow the use of your version of this file
  27  * only under the terms of the GPL and not to allow others to use your
  28  * version of this file under the MPL, indicate your decision by
  29  * deleting the provisions above and replace them with the notice and
  30  * other provisions required by the GPL.  If you do not delete the
  31  * provisions above, a recipient may use your version of this file
  32  * under either the MPL or the GPL.
  33  *
  34  * Here's the general details on how the PLX9052 adapter works:
  35  *
  36  * - Two PCI I/O address spaces, one 0x80 long which contains the
  37  * PLX9052 registers, and one that's 0x40 long mapped to the PCMCIA
  38  * slot I/O address space.
  39  *
  40  * - One PCI memory address space, mapped to the PCMCIA attribute space
  41  * (containing the CIS).
  42  *
  43  * Using the later, you can read through the CIS data to make sure the
  44  * card is compatible with the driver. Keep in mind that the PCMCIA
  45  * spec specifies the CIS as the lower 8 bits of each word read from
  46  * the CIS, so to read the bytes of the CIS, read every other byte
  47  * (0,2,4,...). Passing that test, you need to enable the I/O address
  48  * space on the PCMCIA card via the PCMCIA COR register. This is the
  49  * first byte following the CIS. In my case (which may not have any
  50  * relation to what's on the PRISM2 cards), COR was at offset 0x800
  51  * within the PCI memory space. Write 0x41 to the COR register to
  52  * enable I/O mode and to select level triggered interrupts. To
  53  * confirm you actually succeeded, read the COR register back and make
  54  * sure it actually got set to 0x41, in case you have an unexpected
  55  * card inserted.
  56  *
  57  * Following that, you can treat the second PCI I/O address space (the
  58  * one that's not 0x80 in length) as the PCMCIA I/O space.
  59  *
  60  * Note that in the Eumitcom's source for their drivers, they register
  61  * the interrupt as edge triggered when registering it with the
  62  * Windows kernel. I don't recall how to register edge triggered on
  63  * Linux (if it can be done at all). But in some experimentation, I
  64  * don't see much operational difference between using either
  65  * interrupt mode. Don't mess with the interrupt mode in the COR
  66  * register though, as the PLX9052 wants level triggers with the way
  67  * the serial EEPROM configures it on the WL11000.
  68  *
  69  * There's some other little quirks related to timing that I bumped
  70  * into, but I don't recall right now. Also, there's two variants of
  71  * the WL11000 I've seen, revision A1 and T2. These seem to differ
  72  * slightly in the timings configured in the wait-state generator in
  73  * the PLX9052. There have also been some comments from Eumitcom that
  74  * cards shouldn't be hot swapped, apparently due to risk of cooking
  75  * the PLX9052. I'm unsure why they believe this, as I can't see
  76  * anything in the design that would really cause a problem, except
  77  * for crashing drivers not written to expect it. And having developed
  78  * drivers for the WL11000, I'd say it's quite tricky to write code
  79  * that will successfully deal with a hot unplug. Very odd things
  80  * happen on the I/O side of things. But anyway, be warned. Despite
  81  * that, I've hot-swapped a number of times during debugging and
  82  * driver development for various reasons (stuck WAIT# line after the
  83  * radio card's firmware locks up).
  84  */
  85
  86 #define DRIVER_NAME "orinoco_plx"
  87 #define PFX DRIVER_NAME ": "
  88
  89 #include <linux/module.h>
  90 #include <linux/kernel.h>
  91 #include <linux/init.h>
  92 #include <linux/delay.h>
  93 #include <linux/pci.h>
  94 #include <pcmcia/cisreg.h>
  95
  96 #include "orinoco.h"
  97 #include "orinoco_pci.h"
  98
  99 #define COR_OFFSET      (0x3e0) /* COR attribute offset of Prism2 PC card */
 100 #define COR_VALUE       (COR_LEVEL_REQ | COR_FUNC_ENA) /* Enable PC card with interrupt in level trigger */
 101 #define COR_RESET     (0x80)    /* reset bit in the COR register */
 102 #define PLX_RESET_TIME  (500)   /* milliseconds */
 103
 104 #define PLX_INTCSR              0x4c /* Interrupt Control & Status Register */
 105 #define PLX_INTCSR_INTEN        (1 << 6) /* Interrupt Enable bit */
 106
 107 /*
 108  * Do a soft reset of the card using the Configuration Option Register
 109  */
 110 static int orinoco_plx_cor_reset(struct orinoco_private *priv)
 111 {
 112         struct hermes *hw = &priv->hw;
 113         struct orinoco_pci_card *card = priv->card;
 114         unsigned long timeout;
 115         u16 reg;
 116
 117         iowrite8(COR_VALUE | COR_RESET, card->attr_io + COR_OFFSET);
 118         mdelay(1);
 119
 120         iowrite8(COR_VALUE, card->attr_io + COR_OFFSET);
 121         mdelay(1);
 122
 123         /* Just in case, wait more until the card is no longer busy */
 124         timeout = jiffies + msecs_to_jiffies(PLX_RESET_TIME);
 125         reg = hermes_read_regn(hw, CMD);
 126         while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) {
 127                 mdelay(1);
 128                 reg = hermes_read_regn(hw, CMD);
 129         }
 130
 131         /* Still busy? */
 132         if (reg & HERMES_CMD_BUSY) {
 133                 printk(KERN_ERR PFX "Busy timeout\n");
 134                 return -ETIMEDOUT;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static int orinoco_plx_hw_init(struct orinoco_pci_card *card)
 141 {
 142         int i;
 143         u32 csr_reg;
 144         static const u8 cis_magic[] = {
 145                 0x01, 0x03, 0x00, 0x00, 0xff, 0x17, 0x04, 0x67
 146         };
 147
 148         printk(KERN_DEBUG PFX "CIS: ");
 149         for (i = 0; i < 16; i++)
 150                 printk("%02X:", ioread8(card->attr_io + (i << 1)));
 151         printk("\n");
 152
 153         /* Verify whether a supported PC card is present */
 154         /* FIXME: we probably need to be smarted about this */
 155         for (i = 0; i < sizeof(cis_magic); i++) {
 156                 if (cis_magic[i] != ioread8(card->attr_io + (i << 1))) {
 157                         printk(KERN_ERR PFX "The CIS value of Prism2 PC "
 158                                "card is unexpected\n");
 159                         return -ENODEV;
 160                 }
 161         }
 162
 163         /* bjoern: We need to tell the card to enable interrupts, in
 164            case the serial eprom didn't do this already.  See the
 165            PLX9052 data book, p8-1 and 8-24 for reference. */
 166         csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
 167         if (!(csr_reg & PLX_INTCSR_INTEN)) {
 168                 csr_reg |= PLX_INTCSR_INTEN;
 169                 iowrite32(csr_reg, card->bridge_io + PLX_INTCSR);
 170                 csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
 171                 if (!(csr_reg & PLX_INTCSR_INTEN)) {
 172                         printk(KERN_ERR PFX "Cannot enable interrupts\n");
 173                         return -EIO;
 174                 }
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int orinoco_plx_init_one(struct pci_dev *pdev,
 181                                 const struct pci_device_id *ent)
 182 {
 183         int err;
 184         struct orinoco_private *priv;
 185         struct orinoco_pci_card *card;
 186         void __iomem *hermes_io, *attr_io, *bridge_io;
 187
 188         err = pci_enable_device(pdev);
 189         if (err) {
 190                 printk(KERN_ERR PFX "Cannot enable PCI device\n");
 191                 return err;
 192         }
 193
 194         err = pci_request_regions(pdev, DRIVER_NAME);
 195         if (err) {
 196                 printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
 197                 goto fail_resources;
 198         }
 199
 200         bridge_io = pci_iomap(pdev, 1, 0);
 201         if (!bridge_io) {
 202                 printk(KERN_ERR PFX "Cannot map bridge registers\n");
 203                 err = -EIO;
 204                 goto fail_map_bridge;
 205         }
 206
 207         attr_io = pci_iomap(pdev, 2, 0);
 208         if (!attr_io) {
 209                 printk(KERN_ERR PFX "Cannot map PCMCIA attributes\n");
 210                 err = -EIO;
 211                 goto fail_map_attr;
 212         }
 213
 214         hermes_io = pci_iomap(pdev, 3, 0);
 215         if (!hermes_io) {
 216                 printk(KERN_ERR PFX "Cannot map chipset registers\n");
 217                 err = -EIO;
 218                 goto fail_map_hermes;
 219         }
 220
 221         /* Allocate network device */
 222         priv = alloc_orinocodev(sizeof(*card), &pdev->dev,
 223                                 orinoco_plx_cor_reset, NULL);
 224         if (!priv) {
 225                 printk(KERN_ERR PFX "Cannot allocate network device\n");
 226                 err = -ENOMEM;
 227                 goto fail_alloc;
 228         }
 229
 230         card = priv->card;
 231         card->bridge_io = bridge_io;
 232         card->attr_io = attr_io;
 233
 234         hermes_struct_init(&priv->hw, hermes_io, HERMES_16BIT_REGSPACING);
 235
 236         err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
 237                           DRIVER_NAME, priv);
 238         if (err) {
 239                 printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
 240                 err = -EBUSY;
 241                 goto fail_irq;
 242         }
 243
 244         err = orinoco_plx_hw_init(card);
 245         if (err) {
 246                 printk(KERN_ERR PFX "Hardware initialization failed\n");
 247                 goto fail;
 248         }
 249
 250         err = orinoco_plx_cor_reset(priv);
 251         if (err) {
 252                 printk(KERN_ERR PFX "Initial reset failed\n");
 253                 goto fail;
 254         }
 255
 256         err = orinoco_init(priv);
 257         if (err) {
 258                 printk(KERN_ERR PFX "orinoco_init() failed\n");
 259                 goto fail;
 260         }
 261
 262         err = orinoco_if_add(priv, 0, 0, NULL);
 263         if (err) {
 264                 printk(KERN_ERR PFX "orinoco_if_add() failed\n");
 265                 goto fail_wiphy;
 266         }
 267
 268         pci_set_drvdata(pdev, priv);
 269
 270         return 0;
 271
 272  fail_wiphy:
 273         wiphy_unregister(priv_to_wiphy(priv));
 274  fail:
 275         free_irq(pdev->irq, priv);
 276
 277  fail_irq:
 278         free_orinocodev(priv);
 279
 280  fail_alloc:
 281         pci_iounmap(pdev, hermes_io);
 282
 283  fail_map_hermes:
 284         pci_iounmap(pdev, attr_io);
 285
 286  fail_map_attr:
 287         pci_iounmap(pdev, bridge_io);
 288
 289  fail_map_bridge:
 290         pci_release_regions(pdev);
 291
 292  fail_resources:
 293         pci_disable_device(pdev);
 294
 295         return err;
 296 }
 297
 298 static void orinoco_plx_remove_one(struct pci_dev *pdev)
 299 {
 300         struct orinoco_private *priv = pci_get_drvdata(pdev);
 301         struct orinoco_pci_card *card = priv->card;
 302
 303         orinoco_if_del(priv);
 304         wiphy_unregister(priv_to_wiphy(priv));
 305         free_irq(pdev->irq, priv);
 306         free_orinocodev(priv);
 307         pci_iounmap(pdev, priv->hw.iobase);
 308         pci_iounmap(pdev, card->attr_io);
 309         pci_iounmap(pdev, card->bridge_io);
 310         pci_release_regions(pdev);
 311         pci_disable_device(pdev);
 312 }
 313
 314 static const struct pci_device_id orinoco_plx_id_table[] = {
 315         {0x111a, 0x1023, PCI_ANY_ID, PCI_ANY_ID,},      /* Siemens SpeedStream SS1023 */
 316         {0x1385, 0x4100, PCI_ANY_ID, PCI_ANY_ID,},      /* Netgear MA301 */
 317         {0x15e8, 0x0130, PCI_ANY_ID, PCI_ANY_ID,},      /* Correga  - does this work? */
 318         {0x1638, 0x1100, PCI_ANY_ID, PCI_ANY_ID,},      /* SMC EZConnect SMC2602W,
 319                                                            Eumitcom PCI WL11000,
 320                                                            Addtron AWA-100 */
 321         {0x16ab, 0x1100, PCI_ANY_ID, PCI_ANY_ID,},      /* Global Sun Tech GL24110P */
 322         {0x16ab, 0x1101, PCI_ANY_ID, PCI_ANY_ID,},      /* Reported working, but unknown */
 323         {0x16ab, 0x1102, PCI_ANY_ID, PCI_ANY_ID,},      /* Linksys WDT11 */
 324         {0x16ec, 0x3685, PCI_ANY_ID, PCI_ANY_ID,},      /* USR 2415 */
 325         {0xec80, 0xec00, PCI_ANY_ID, PCI_ANY_ID,},      /* Belkin F5D6000 tested by
 326                                                            Brendan W. McAdams <rit AT jacked-in.org> */
 327         {0x10b7, 0x7770, PCI_ANY_ID, PCI_ANY_ID,},      /* 3Com AirConnect PCI tested by
 328                                                            Damien Persohn <damien AT persohn.net> */
 329         {0,},
 330 };
 331
 332 MODULE_DEVICE_TABLE(pci, orinoco_plx_id_table);
 333
 334 static struct pci_driver orinoco_plx_driver = {
 335         .name           = DRIVER_NAME,
 336         .id_table       = orinoco_plx_id_table,
 337         .probe          = orinoco_plx_init_one,
 338         .remove         = orinoco_plx_remove_one,
 339         .suspend        = orinoco_pci_suspend,
 340         .resume         = orinoco_pci_resume,
 341 };
 342
 343 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 344         " (Pavel Roskin <proski@gnu.org>,"
 345         " David Gibson <hermes@gibson.dropbear.id.au>,"
 346         " Daniel Barlow <dan@telent.net>)";
 347 MODULE_AUTHOR("Daniel Barlow <dan@telent.net>");
 348 MODULE_DESCRIPTION("Driver for wireless LAN cards using the PLX9052 PCI bridge");
 349 MODULE_LICENSE("Dual MPL/GPL");
 350
 351 static int __init orinoco_plx_init(void)
 352 {
 353         printk(KERN_DEBUG "%s\n", version);
 354         return pci_register_driver(&orinoco_plx_driver);
 355 }
 356
 357 static void __exit orinoco_plx_exit(void)
 358 {
 359         pci_unregister_driver(&orinoco_plx_driver);
 360 }
 361
 362 module_init(orinoco_plx_init);
 363 module_exit(orinoco_plx_exit);
 364
 365 /*
 366  * Local variables:
 367  *  c-indent-level: 8
 368  *  c-basic-offset: 8
 369  *  tab-width: 8
 370  * End:
 371  */