drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00pci
  23         Abstract: rt2x00 generic pci device routines.
  24  */
  25
  26 #include <linux/dma-mapping.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00pci.h"
  33
  34 /*
  35  * Beacon handlers.
  36  */
  37 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
  38                             struct ieee80211_tx_control *control)
  39 {
  40         struct rt2x00_dev *rt2x00dev = hw->priv;
  41         struct rt2x00_intf *intf = vif_to_intf(control->vif);
  42         struct queue_entry_priv_pci_tx *priv_tx;
  43         struct skb_frame_desc *skbdesc;
  44
  45         if (unlikely(!intf->beacon))
  46                 return -ENOBUFS;
  47
  48         priv_tx = intf->beacon->priv_data;
  49
  50         /*
  51          * Fill in skb descriptor
  52          */
  53         skbdesc = get_skb_frame_desc(skb);
  54         memset(skbdesc, 0, sizeof(*skbdesc));
  55         skbdesc->data = skb->data;
  56         skbdesc->data_len = skb->len;
  57         skbdesc->desc = priv_tx->desc;
  58         skbdesc->desc_len = intf->beacon->queue->desc_size;
  59         skbdesc->entry = intf->beacon;
  60
  61         /*
  62          * Just in case mac80211 doesn't set this correctly,
  63          * but we need this queue set for the descriptor
  64          * initialization.
  65          */
  66         control->queue = IEEE80211_TX_QUEUE_BEACON;
  67         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
  68
  69         /*
  70          * Enable beacon generation.
  71          * Write entire beacon with descriptor to register,
  72          * and kick the beacon generator.
  73          */
  74         memcpy(priv_tx->data, skb->data, skb->len);
  75         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  76
  77         return 0;
  78 }
  79 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  80
  81 /*
  82  * TX data handlers.
  83  */
  84 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  85                             struct data_queue *queue, struct sk_buff *skb,
  86                             struct ieee80211_tx_control *control)
  87 {
  88         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
  89         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
  90         struct skb_frame_desc *skbdesc;
  91         u32 word;
  92
  93         if (rt2x00queue_full(queue))
  94                 return -EINVAL;
  95
  96         rt2x00_desc_read(priv_tx->desc, 0, &word);
  97
  98         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  99             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
 100                 ERROR(rt2x00dev,
 101                       "Arrived at non-free entry in the non-full queue %d.\n"
 102                       "Please file bug report to %s.\n",
 103                       control->queue, DRV_PROJECT);
 104                 return -EINVAL;
 105         }
 106
 107         /*
 108          * Fill in skb descriptor
 109          */
 110         skbdesc = get_skb_frame_desc(skb);
 111         memset(skbdesc, 0, sizeof(*skbdesc));
 112         skbdesc->data = skb->data;
 113         skbdesc->data_len = queue->data_size;
 114         skbdesc->desc = priv_tx->desc;
 115         skbdesc->desc_len = queue->desc_size;
 116         skbdesc->entry = entry;
 117
 118         memcpy(priv_tx->data, skb->data, skb->len);
 119         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 120
 121         rt2x00queue_index_inc(queue, Q_INDEX);
 122
 123         return 0;
 124 }
 125 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 126
 127 /*
 128  * TX/RX data handlers.
 129  */
 130 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 131 {
 132         struct data_queue *queue = rt2x00dev->rx;
 133         struct queue_entry *entry;
 134         struct queue_entry_priv_pci_rx *priv_rx;
 135         struct ieee80211_hdr *hdr;
 136         struct skb_frame_desc *skbdesc;
 137         struct rxdone_entry_desc rxdesc;
 138         int header_size;
 139         int align;
 140         u32 word;
 141
 142         while (1) {
 143                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 144                 priv_rx = entry->priv_data;
 145                 rt2x00_desc_read(priv_rx->desc, 0, &word);
 146
 147                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 148                         break;
 149
 150                 memset(&rxdesc, 0, sizeof(rxdesc));
 151                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 152
 153                 hdr = (struct ieee80211_hdr *)priv_rx->data;
 154                 header_size =
 155                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 156
 157                 /*
 158                  * The data behind the ieee80211 header must be
 159                  * aligned on a 4 byte boundary.
 160                  */
 161                 align = header_size % 4;
 162
 163                 /*
 164                  * Allocate the sk_buffer, initialize it and copy
 165                  * all data into it.
 166                  */
 167                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 168                 if (!entry->skb)
 169                         return;
 170
 171                 skb_reserve(entry->skb, align);
 172                 memcpy(skb_put(entry->skb, rxdesc.size),
 173                        priv_rx->data, rxdesc.size);
 174
 175                 /*
 176                  * Fill in skb descriptor
 177                  */
 178                 skbdesc = get_skb_frame_desc(entry->skb);
 179                 memset(skbdesc, 0, sizeof(*skbdesc));
 180                 skbdesc->data = entry->skb->data;
 181                 skbdesc->data_len = queue->data_size;
 182                 skbdesc->desc = priv_rx->desc;
 183                 skbdesc->desc_len = queue->desc_size;
 184                 skbdesc->entry = entry;
 185
 186                 /*
 187                  * Send the frame to rt2x00lib for further processing.
 188                  */
 189                 rt2x00lib_rxdone(entry, &rxdesc);
 190
 191                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 192                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 193                         rt2x00_desc_write(priv_rx->desc, 0, word);
 194                 }
 195
 196                 rt2x00queue_index_inc(queue, Q_INDEX);
 197         }
 198 }
 199 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 200
 201 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 202                       struct txdone_entry_desc *txdesc)
 203 {
 204         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 205         u32 word;
 206
 207         txdesc->control = &priv_tx->control;
 208         rt2x00lib_txdone(entry, txdesc);
 209
 210         /*
 211          * Make this entry available for reuse.
 212          */
 213         entry->flags = 0;
 214
 215         rt2x00_desc_read(priv_tx->desc, 0, &word);
 216         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 217         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 218         rt2x00_desc_write(priv_tx->desc, 0, word);
 219
 220         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 221
 222         /*
 223          * If the data queue was full before the txdone handler
 224          * we must make sure the packet queue in the mac80211 stack
 225          * is reenabled when the txdone handler has finished.
 226          */
 227         if (!rt2x00queue_full(entry->queue))
 228                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 229
 230 }
 231 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 232
 233 /*
 234  * Device initialization handlers.
 235  */
 236 #define dma_size(__queue)                               \
 237 ({                                                      \
 238         (__queue)->limit *                              \
 239             ((__queue)->desc_size + (__queue)->data_size);\
 240 })
 241
 242 #define priv_offset(__queue, __base, __i)               \
 243 ({                                                      \
 244         (__base) + ((__i) * (__queue)->desc_size);      \
 245 })
 246
 247 #define data_addr_offset(__queue, __base, __i)          \
 248 ({                                                      \
 249         (__base) +                                      \
 250             ((__queue)->limit * (__queue)->desc_size) + \
 251             ((__i) * (__queue)->data_size);             \
 252 })
 253
 254 #define data_dma_offset(__queue, __base, __i)           \
 255 ({                                                      \
 256         (__base) +                                      \
 257             ((__queue)->limit * (__queue)->desc_size) + \
 258             ((__i) * (__queue)->data_size);             \
 259 })
 260
 261 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 262                                      struct data_queue *queue)
 263 {
 264         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 265         struct queue_entry_priv_pci_tx *priv_tx;
 266         void *data_addr;
 267         dma_addr_t data_dma;
 268         unsigned int i;
 269
 270         /*
 271          * Allocate DMA memory for descriptor and buffer.
 272          */
 273         data_addr = pci_alloc_consistent(pci_dev, dma_size(queue), &data_dma);
 274         if (!data_addr)
 275                 return -ENOMEM;
 276
 277         /*
 278          * Initialize all queue entries to contain valid addresses.
 279          */
 280         for (i = 0; i < queue->limit; i++) {
 281                 priv_tx = queue->entries[i].priv_data;
 282                 priv_tx->desc = priv_offset(queue, data_addr, i);
 283                 priv_tx->data = data_addr_offset(queue, data_addr, i);
 284                 priv_tx->dma = data_dma_offset(queue, data_dma, i);
 285         }
 286
 287         return 0;
 288 }
 289
 290 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 291                                      struct data_queue *queue)
 292 {
 293         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 294         struct queue_entry_priv_pci_tx *priv_tx = queue->entries[0].priv_data;
 295
 296         if (priv_tx->data)
 297                 pci_free_consistent(pci_dev, dma_size(queue),
 298                                     priv_tx->data, priv_tx->dma);
 299         priv_tx->data = NULL;
 300 }
 301
 302 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 303 {
 304         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 305         struct data_queue *queue;
 306         int status;
 307
 308         /*
 309          * Allocate DMA
 310          */
 311         queue_for_each(rt2x00dev, queue) {
 312                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 313                 if (status)
 314                         goto exit;
 315         }
 316
 317         /*
 318          * Register interrupt handler.
 319          */
 320         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 321                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 322         if (status) {
 323                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 324                       pci_dev->irq, status);
 325                 return status;
 326         }
 327
 328         return 0;
 329
 330 exit:
 331         rt2x00pci_uninitialize(rt2x00dev);
 332
 333         return status;
 334 }
 335 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 336
 337 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 338 {
 339         struct data_queue *queue;
 340
 341         /*
 342          * Free irq line.
 343          */
 344         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 345
 346         /*
 347          * Free DMA
 348          */
 349         queue_for_each(rt2x00dev, queue)
 350                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 351 }
 352 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 353
 354 /*
 355  * PCI driver handlers.
 356  */
 357 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 358 {
 359         kfree(rt2x00dev->rf);
 360         rt2x00dev->rf = NULL;
 361
 362         kfree(rt2x00dev->eeprom);
 363         rt2x00dev->eeprom = NULL;
 364
 365         if (rt2x00dev->csr_addr) {
 366                 iounmap(rt2x00dev->csr_addr);
 367                 rt2x00dev->csr_addr = NULL;
 368         }
 369 }
 370
 371 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 372 {
 373         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 374
 375         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 376                                       pci_resource_len(pci_dev, 0));
 377         if (!rt2x00dev->csr_addr)
 378                 goto exit;
 379
 380         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 381         if (!rt2x00dev->eeprom)
 382                 goto exit;
 383
 384         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 385         if (!rt2x00dev->rf)
 386                 goto exit;
 387
 388         return 0;
 389
 390 exit:
 391         ERROR_PROBE("Failed to allocate registers.\n");
 392
 393         rt2x00pci_free_reg(rt2x00dev);
 394
 395         return -ENOMEM;
 396 }
 397
 398 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 399 {
 400         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 401         struct ieee80211_hw *hw;
 402         struct rt2x00_dev *rt2x00dev;
 403         int retval;
 404
 405         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 406         if (retval) {
 407                 ERROR_PROBE("PCI request regions failed.\n");
 408                 return retval;
 409         }
 410
 411         retval = pci_enable_device(pci_dev);
 412         if (retval) {
 413                 ERROR_PROBE("Enable device failed.\n");
 414                 goto exit_release_regions;
 415         }
 416
 417         pci_set_master(pci_dev);
 418
 419         if (pci_set_mwi(pci_dev))
 420                 ERROR_PROBE("MWI not available.\n");
 421
 422         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 423             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 424                 ERROR_PROBE("PCI DMA not supported.\n");
 425                 retval = -EIO;
 426                 goto exit_disable_device;
 427         }
 428
 429         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 430         if (!hw) {
 431                 ERROR_PROBE("Failed to allocate hardware.\n");
 432                 retval = -ENOMEM;
 433                 goto exit_disable_device;
 434         }
 435
 436         pci_set_drvdata(pci_dev, hw);
 437
 438         rt2x00dev = hw->priv;
 439         rt2x00dev->dev = pci_dev;
 440         rt2x00dev->ops = ops;
 441         rt2x00dev->hw = hw;
 442
 443         retval = rt2x00pci_alloc_reg(rt2x00dev);
 444         if (retval)
 445                 goto exit_free_device;
 446
 447         retval = rt2x00lib_probe_dev(rt2x00dev);
 448         if (retval)
 449                 goto exit_free_reg;
 450
 451         return 0;
 452
 453 exit_free_reg:
 454         rt2x00pci_free_reg(rt2x00dev);
 455
 456 exit_free_device:
 457         ieee80211_free_hw(hw);
 458
 459 exit_disable_device:
 460         if (retval != -EBUSY)
 461                 pci_disable_device(pci_dev);
 462
 463 exit_release_regions:
 464         pci_release_regions(pci_dev);
 465
 466         pci_set_drvdata(pci_dev, NULL);
 467
 468         return retval;
 469 }
 470 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 471
 472 void rt2x00pci_remove(struct pci_dev *pci_dev)
 473 {
 474         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 475         struct rt2x00_dev *rt2x00dev = hw->priv;
 476
 477         /*
 478          * Free all allocated data.
 479          */
 480         rt2x00lib_remove_dev(rt2x00dev);
 481         rt2x00pci_free_reg(rt2x00dev);
 482         ieee80211_free_hw(hw);
 483
 484         /*
 485          * Free the PCI device data.
 486          */
 487         pci_set_drvdata(pci_dev, NULL);
 488         pci_disable_device(pci_dev);
 489         pci_release_regions(pci_dev);
 490 }
 491 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 492
 493 #ifdef CONFIG_PM
 494 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 495 {
 496         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 497         struct rt2x00_dev *rt2x00dev = hw->priv;
 498         int retval;
 499
 500         retval = rt2x00lib_suspend(rt2x00dev, state);
 501         if (retval)
 502                 return retval;
 503
 504         rt2x00pci_free_reg(rt2x00dev);
 505
 506         pci_save_state(pci_dev);
 507         pci_disable_device(pci_dev);
 508         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 509 }
 510 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 511
 512 int rt2x00pci_resume(struct pci_dev *pci_dev)
 513 {
 514         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 515         struct rt2x00_dev *rt2x00dev = hw->priv;
 516         int retval;
 517
 518         if (pci_set_power_state(pci_dev, PCI_D0) ||
 519             pci_enable_device(pci_dev) ||
 520             pci_restore_state(pci_dev)) {
 521                 ERROR(rt2x00dev, "Failed to resume device.\n");
 522                 return -EIO;
 523         }
 524
 525         retval = rt2x00pci_alloc_reg(rt2x00dev);
 526         if (retval)
 527                 return retval;
 528
 529         retval = rt2x00lib_resume(rt2x00dev);
 530         if (retval)
 531                 goto exit_free_reg;
 532
 533         return 0;
 534
 535 exit_free_reg:
 536         rt2x00pci_free_reg(rt2x00dev);
 537
 538         return retval;
 539 }
 540 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 541 #endif /* CONFIG_PM */
 542
 543 /*
 544  * rt2x00pci module information.
 545  */
 546 MODULE_AUTHOR(DRV_PROJECT);
 547 MODULE_VERSION(DRV_VERSION);
 548 MODULE_DESCRIPTION("rt2x00 pci library");
 549 MODULE_LICENSE("GPL");