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 queue_entry_priv_pci_tx *priv_tx;
  42         struct skb_frame_desc *skbdesc;
  43         struct data_queue *queue;
  44         struct queue_entry *entry;
  45
  46         /*
  47          * Just in case mac80211 doesn't set this correctly,
  48          * but we need this queue set for the descriptor
  49          * initialization.
  50          */
  51         control->queue = IEEE80211_TX_QUEUE_BEACON;
  52         queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
  53         entry = rt2x00queue_get_entry(queue, Q_INDEX);
  54         priv_tx = entry->priv_data;
  55
  56         /*
  57          * Fill in skb descriptor
  58          */
  59         skbdesc = get_skb_frame_desc(skb);
  60         memset(skbdesc, 0, sizeof(*skbdesc));
  61         skbdesc->data = skb->data;
  62         skbdesc->data_len = queue->data_size;
  63         skbdesc->desc = priv_tx->desc;
  64         skbdesc->desc_len = queue->desc_size;
  65         skbdesc->entry = entry;
  66
  67         memcpy(priv_tx->data, skb->data, skb->len);
  68         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
  69
  70         /*
  71          * Enable beacon generation.
  72          */
  73         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  74
  75         return 0;
  76 }
  77 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  78
  79 /*
  80  * TX data handlers.
  81  */
  82 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  83                             struct data_queue *queue, struct sk_buff *skb,
  84                             struct ieee80211_tx_control *control)
  85 {
  86         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
  87         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
  88         struct skb_frame_desc *skbdesc;
  89         u32 word;
  90
  91         if (rt2x00queue_full(queue))
  92                 return -EINVAL;
  93
  94         rt2x00_desc_read(priv_tx->desc, 0, &word);
  95
  96         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  97             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  98                 ERROR(rt2x00dev,
  99                       "Arrived at non-free entry in the non-full queue %d.\n"
 100                       "Please file bug report to %s.\n",
 101                       control->queue, DRV_PROJECT);
 102                 return -EINVAL;
 103         }
 104
 105         /*
 106          * Fill in skb descriptor
 107          */
 108         skbdesc = get_skb_frame_desc(skb);
 109         memset(skbdesc, 0, sizeof(*skbdesc));
 110         skbdesc->data = skb->data;
 111         skbdesc->data_len = queue->data_size;
 112         skbdesc->desc = priv_tx->desc;
 113         skbdesc->desc_len = queue->desc_size;
 114         skbdesc->entry = entry;
 115
 116         memcpy(priv_tx->data, skb->data, skb->len);
 117         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 118
 119         rt2x00queue_index_inc(queue, Q_INDEX);
 120
 121         return 0;
 122 }
 123 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 124
 125 /*
 126  * TX/RX data handlers.
 127  */
 128 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 129 {
 130         struct data_queue *queue = rt2x00dev->rx;
 131         struct queue_entry *entry;
 132         struct queue_entry_priv_pci_rx *priv_rx;
 133         struct ieee80211_hdr *hdr;
 134         struct skb_frame_desc *skbdesc;
 135         struct rxdone_entry_desc rxdesc;
 136         int header_size;
 137         int align;
 138         u32 word;
 139
 140         while (1) {
 141                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 142                 priv_rx = entry->priv_data;
 143                 rt2x00_desc_read(priv_rx->desc, 0, &word);
 144
 145                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 146                         break;
 147
 148                 memset(&rxdesc, 0, sizeof(rxdesc));
 149                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 150
 151                 hdr = (struct ieee80211_hdr *)priv_rx->data;
 152                 header_size =
 153                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 154
 155                 /*
 156                  * The data behind the ieee80211 header must be
 157                  * aligned on a 4 byte boundary.
 158                  */
 159                 align = header_size % 4;
 160
 161                 /*
 162                  * Allocate the sk_buffer, initialize it and copy
 163                  * all data into it.
 164                  */
 165                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 166                 if (!entry->skb)
 167                         return;
 168
 169                 skb_reserve(entry->skb, align);
 170                 memcpy(skb_put(entry->skb, rxdesc.size),
 171                        priv_rx->data, rxdesc.size);
 172
 173                 /*
 174                  * Fill in skb descriptor
 175                  */
 176                 skbdesc = get_skb_frame_desc(entry->skb);
 177                 memset(skbdesc, 0, sizeof(*skbdesc));
 178                 skbdesc->data = entry->skb->data;
 179                 skbdesc->data_len = queue->data_size;
 180                 skbdesc->desc = priv_rx->desc;
 181                 skbdesc->desc_len = queue->desc_size;
 182                 skbdesc->entry = entry;
 183
 184                 /*
 185                  * Send the frame to rt2x00lib for further processing.
 186                  */
 187                 rt2x00lib_rxdone(entry, &rxdesc);
 188
 189                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 190                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 191                         rt2x00_desc_write(priv_rx->desc, 0, word);
 192                 }
 193
 194                 rt2x00queue_index_inc(queue, Q_INDEX);
 195         }
 196 }
 197 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 198
 199 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 200                       struct txdone_entry_desc *txdesc)
 201 {
 202         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 203         u32 word;
 204
 205         txdesc->control = &priv_tx->control;
 206         rt2x00lib_txdone(entry, txdesc);
 207
 208         /*
 209          * Make this entry available for reuse.
 210          */
 211         entry->flags = 0;
 212
 213         rt2x00_desc_read(priv_tx->desc, 0, &word);
 214         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 215         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 216         rt2x00_desc_write(priv_tx->desc, 0, word);
 217
 218         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 219
 220         /*
 221          * If the data queue was full before the txdone handler
 222          * we must make sure the packet queue in the mac80211 stack
 223          * is reenabled when the txdone handler has finished.
 224          */
 225         if (!rt2x00queue_full(entry->queue))
 226                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 227
 228 }
 229 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 230
 231 /*
 232  * Device initialization handlers.
 233  */
 234 #define dma_size(__queue)                               \
 235 ({                                                      \
 236         (__queue)->limit *                              \
 237             ((__queue)->desc_size + (__queue)->data_size);\
 238 })
 239
 240 #define priv_offset(__queue, __base, __i)               \
 241 ({                                                      \
 242         (__base) + ((__i) * (__queue)->desc_size);      \
 243 })
 244
 245 #define data_addr_offset(__queue, __base, __i)          \
 246 ({                                                      \
 247         (__base) +                                      \
 248             ((__queue)->limit * (__queue)->desc_size) + \
 249             ((__i) * (__queue)->data_size);             \
 250 })
 251
 252 #define data_dma_offset(__queue, __base, __i)           \
 253 ({                                                      \
 254         (__base) +                                      \
 255             ((__queue)->limit * (__queue)->desc_size) + \
 256             ((__i) * (__queue)->data_size);             \
 257 })
 258
 259 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 260                                      struct data_queue *queue)
 261 {
 262         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 263         struct queue_entry_priv_pci_tx *priv_tx;
 264         void *data_addr;
 265         dma_addr_t data_dma;
 266         unsigned int i;
 267
 268         /*
 269          * Allocate DMA memory for descriptor and buffer.
 270          */
 271         data_addr = pci_alloc_consistent(pci_dev, dma_size(queue), &data_dma);
 272         if (!data_addr)
 273                 return -ENOMEM;
 274
 275         /*
 276          * Initialize all queue entries to contain valid addresses.
 277          */
 278         for (i = 0; i < queue->limit; i++) {
 279                 priv_tx = queue->entries[i].priv_data;
 280                 priv_tx->desc = priv_offset(queue, data_addr, i);
 281                 priv_tx->data = data_addr_offset(queue, data_addr, i);
 282                 priv_tx->dma = data_dma_offset(queue, data_dma, i);
 283         }
 284
 285         return 0;
 286 }
 287
 288 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 289                                      struct data_queue *queue)
 290 {
 291         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 292         struct queue_entry_priv_pci_tx *priv_tx = queue->entries[0].priv_data;
 293
 294         if (priv_tx->data)
 295                 pci_free_consistent(pci_dev, dma_size(queue),
 296                                     priv_tx->data, priv_tx->dma);
 297         priv_tx->data = NULL;
 298 }
 299
 300 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 301 {
 302         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 303         struct data_queue *queue;
 304         int status;
 305
 306         /*
 307          * Allocate DMA
 308          */
 309         queue_for_each(rt2x00dev, queue) {
 310                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 311                 if (status)
 312                         goto exit;
 313         }
 314
 315         /*
 316          * Register interrupt handler.
 317          */
 318         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 319                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 320         if (status) {
 321                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 322                       pci_dev->irq, status);
 323                 return status;
 324         }
 325
 326         return 0;
 327
 328 exit:
 329         rt2x00pci_uninitialize(rt2x00dev);
 330
 331         return status;
 332 }
 333 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 334
 335 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 336 {
 337         struct data_queue *queue;
 338
 339         /*
 340          * Free irq line.
 341          */
 342         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 343
 344         /*
 345          * Free DMA
 346          */
 347         queue_for_each(rt2x00dev, queue)
 348                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 349 }
 350 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 351
 352 /*
 353  * PCI driver handlers.
 354  */
 355 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 356 {
 357         kfree(rt2x00dev->rf);
 358         rt2x00dev->rf = NULL;
 359
 360         kfree(rt2x00dev->eeprom);
 361         rt2x00dev->eeprom = NULL;
 362
 363         if (rt2x00dev->csr_addr) {
 364                 iounmap(rt2x00dev->csr_addr);
 365                 rt2x00dev->csr_addr = NULL;
 366         }
 367 }
 368
 369 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 370 {
 371         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 372
 373         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 374                                       pci_resource_len(pci_dev, 0));
 375         if (!rt2x00dev->csr_addr)
 376                 goto exit;
 377
 378         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 379         if (!rt2x00dev->eeprom)
 380                 goto exit;
 381
 382         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 383         if (!rt2x00dev->rf)
 384                 goto exit;
 385
 386         return 0;
 387
 388 exit:
 389         ERROR_PROBE("Failed to allocate registers.\n");
 390
 391         rt2x00pci_free_reg(rt2x00dev);
 392
 393         return -ENOMEM;
 394 }
 395
 396 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 397 {
 398         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 399         struct ieee80211_hw *hw;
 400         struct rt2x00_dev *rt2x00dev;
 401         int retval;
 402
 403         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 404         if (retval) {
 405                 ERROR_PROBE("PCI request regions failed.\n");
 406                 return retval;
 407         }
 408
 409         retval = pci_enable_device(pci_dev);
 410         if (retval) {
 411                 ERROR_PROBE("Enable device failed.\n");
 412                 goto exit_release_regions;
 413         }
 414
 415         pci_set_master(pci_dev);
 416
 417         if (pci_set_mwi(pci_dev))
 418                 ERROR_PROBE("MWI not available.\n");
 419
 420         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 421             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 422                 ERROR_PROBE("PCI DMA not supported.\n");
 423                 retval = -EIO;
 424                 goto exit_disable_device;
 425         }
 426
 427         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 428         if (!hw) {
 429                 ERROR_PROBE("Failed to allocate hardware.\n");
 430                 retval = -ENOMEM;
 431                 goto exit_disable_device;
 432         }
 433
 434         pci_set_drvdata(pci_dev, hw);
 435
 436         rt2x00dev = hw->priv;
 437         rt2x00dev->dev = pci_dev;
 438         rt2x00dev->ops = ops;
 439         rt2x00dev->hw = hw;
 440
 441         retval = rt2x00pci_alloc_reg(rt2x00dev);
 442         if (retval)
 443                 goto exit_free_device;
 444
 445         retval = rt2x00lib_probe_dev(rt2x00dev);
 446         if (retval)
 447                 goto exit_free_reg;
 448
 449         return 0;
 450
 451 exit_free_reg:
 452         rt2x00pci_free_reg(rt2x00dev);
 453
 454 exit_free_device:
 455         ieee80211_free_hw(hw);
 456
 457 exit_disable_device:
 458         if (retval != -EBUSY)
 459                 pci_disable_device(pci_dev);
 460
 461 exit_release_regions:
 462         pci_release_regions(pci_dev);
 463
 464         pci_set_drvdata(pci_dev, NULL);
 465
 466         return retval;
 467 }
 468 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 469
 470 void rt2x00pci_remove(struct pci_dev *pci_dev)
 471 {
 472         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 473         struct rt2x00_dev *rt2x00dev = hw->priv;
 474
 475         /*
 476          * Free all allocated data.
 477          */
 478         rt2x00lib_remove_dev(rt2x00dev);
 479         rt2x00pci_free_reg(rt2x00dev);
 480         ieee80211_free_hw(hw);
 481
 482         /*
 483          * Free the PCI device data.
 484          */
 485         pci_set_drvdata(pci_dev, NULL);
 486         pci_disable_device(pci_dev);
 487         pci_release_regions(pci_dev);
 488 }
 489 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 490
 491 #ifdef CONFIG_PM
 492 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 493 {
 494         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 495         struct rt2x00_dev *rt2x00dev = hw->priv;
 496         int retval;
 497
 498         retval = rt2x00lib_suspend(rt2x00dev, state);
 499         if (retval)
 500                 return retval;
 501
 502         rt2x00pci_free_reg(rt2x00dev);
 503
 504         pci_save_state(pci_dev);
 505         pci_disable_device(pci_dev);
 506         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 507 }
 508 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 509
 510 int rt2x00pci_resume(struct pci_dev *pci_dev)
 511 {
 512         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 513         struct rt2x00_dev *rt2x00dev = hw->priv;
 514         int retval;
 515
 516         if (pci_set_power_state(pci_dev, PCI_D0) ||
 517             pci_enable_device(pci_dev) ||
 518             pci_restore_state(pci_dev)) {
 519                 ERROR(rt2x00dev, "Failed to resume device.\n");
 520                 return -EIO;
 521         }
 522
 523         retval = rt2x00pci_alloc_reg(rt2x00dev);
 524         if (retval)
 525                 return retval;
 526
 527         retval = rt2x00lib_resume(rt2x00dev);
 528         if (retval)
 529                 goto exit_free_reg;
 530
 531         return 0;
 532
 533 exit_free_reg:
 534         rt2x00pci_free_reg(rt2x00dev);
 535
 536         return retval;
 537 }
 538 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 539 #endif /* CONFIG_PM */
 540
 541 /*
 542  * rt2x00pci module information.
 543  */
 544 MODULE_AUTHOR(DRV_PROJECT);
 545 MODULE_VERSION(DRV_VERSION);
 546 MODULE_DESCRIPTION("rt2x00 pci library");
 547 MODULE_LICENSE("GPL");