err.no Git - linux-2.6/blob - 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  * TX data handlers.
  36  */
  37 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  38                             struct data_queue *queue, struct sk_buff *skb,
  39                             struct ieee80211_tx_control *control)
  40 {
  41         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
  42         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
  43         struct skb_frame_desc *skbdesc;
  44         struct txentry_desc txdesc;
  45         u32 word;
  46
  47         if (rt2x00queue_full(queue))
  48                 return -EINVAL;
  49
  50         rt2x00_desc_read(priv_tx->desc, 0, &word);
  51
  52         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  53             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  54                 ERROR(rt2x00dev,
  55                       "Arrived at non-free entry in the non-full queue %d.\n"
  56                       "Please file bug report to %s.\n",
  57                       entry->queue->qid, DRV_PROJECT);
  58                 return -EINVAL;
  59         }
  60
  61         /*
  62          * Copy all TX descriptor information into txdesc,
  63          * after that we are free to use the skb->cb array
  64          * for our information.
  65          */
  66         entry->skb = skb;
  67         rt2x00queue_create_tx_descriptor(entry, &txdesc, control);
  68
  69         /*
  70          * Fill in skb descriptor
  71          */
  72         skbdesc = get_skb_frame_desc(skb);
  73         skbdesc->data = skb->data;
  74         skbdesc->data_len = skb->len;
  75         skbdesc->desc = priv_tx->desc;
  76         skbdesc->desc_len = queue->desc_size;
  77         skbdesc->entry = entry;
  78
  79         memcpy(&priv_tx->control, control, sizeof(priv_tx->control));
  80         memcpy(priv_tx->data, skb->data, skb->len);
  81
  82         rt2x00queue_write_tx_descriptor(entry, &txdesc);
  83         rt2x00queue_index_inc(queue, Q_INDEX);
  84
  85         return 0;
  86 }
  87 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  88
  89 /*
  90  * TX/RX data handlers.
  91  */
  92 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  93 {
  94         struct data_queue *queue = rt2x00dev->rx;
  95         struct queue_entry *entry;
  96         struct queue_entry_priv_pci_rx *priv_rx;
  97         struct ieee80211_hdr *hdr;
  98         struct skb_frame_desc *skbdesc;
  99         struct rxdone_entry_desc rxdesc;
 100         int header_size;
 101         int align;
 102         u32 word;
 103
 104         while (1) {
 105                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 106                 priv_rx = entry->priv_data;
 107                 rt2x00_desc_read(priv_rx->desc, 0, &word);
 108
 109                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 110                         break;
 111
 112                 memset(&rxdesc, 0, sizeof(rxdesc));
 113                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 114
 115                 hdr = (struct ieee80211_hdr *)priv_rx->data;
 116                 header_size =
 117                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 118
 119                 /*
 120                  * The data behind the ieee80211 header must be
 121                  * aligned on a 4 byte boundary.
 122                  */
 123                 align = header_size % 4;
 124
 125                 /*
 126                  * Allocate the sk_buffer, initialize it and copy
 127                  * all data into it.
 128                  */
 129                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 130                 if (!entry->skb)
 131                         return;
 132
 133                 skb_reserve(entry->skb, align);
 134                 memcpy(skb_put(entry->skb, rxdesc.size),
 135                        priv_rx->data, rxdesc.size);
 136
 137                 /*
 138                  * Fill in skb descriptor
 139                  */
 140                 skbdesc = get_skb_frame_desc(entry->skb);
 141                 memset(skbdesc, 0, sizeof(*skbdesc));
 142                 skbdesc->data = entry->skb->data;
 143                 skbdesc->data_len = entry->skb->len;
 144                 skbdesc->desc = priv_rx->desc;
 145                 skbdesc->desc_len = queue->desc_size;
 146                 skbdesc->entry = entry;
 147
 148                 /*
 149                  * Send the frame to rt2x00lib for further processing.
 150                  */
 151                 rt2x00lib_rxdone(entry, &rxdesc);
 152
 153                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 154                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 155                         rt2x00_desc_write(priv_rx->desc, 0, word);
 156                 }
 157
 158                 rt2x00queue_index_inc(queue, Q_INDEX);
 159         }
 160 }
 161 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 162
 163 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 164                       struct txdone_entry_desc *txdesc)
 165 {
 166         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 167         u32 word;
 168
 169         txdesc->control = &priv_tx->control;
 170         rt2x00lib_txdone(entry, txdesc);
 171
 172         /*
 173          * Make this entry available for reuse.
 174          */
 175         entry->flags = 0;
 176
 177         rt2x00_desc_read(priv_tx->desc, 0, &word);
 178         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 179         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 180         rt2x00_desc_write(priv_tx->desc, 0, word);
 181
 182         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 183
 184         /*
 185          * If the data queue was full before the txdone handler
 186          * we must make sure the packet queue in the mac80211 stack
 187          * is reenabled when the txdone handler has finished.
 188          */
 189         if (!rt2x00queue_full(entry->queue))
 190                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 191
 192 }
 193 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 194
 195 /*
 196  * Device initialization handlers.
 197  */
 198 #define desc_size(__queue)                      \
 199 ({                                              \
 200          ((__queue)->limit * (__queue)->desc_size);\
 201 })
 202
 203 #define data_size(__queue)                      \
 204 ({                                              \
 205          ((__queue)->limit * (__queue)->data_size);\
 206 })
 207
 208 #define dma_size(__queue)                       \
 209 ({                                              \
 210         data_size(__queue) + desc_size(__queue);\
 211 })
 212
 213 #define desc_offset(__queue, __base, __i)       \
 214 ({                                              \
 215         (__base) + data_size(__queue) +         \
 216             ((__i) * (__queue)->desc_size);     \
 217 })
 218
 219 #define data_offset(__queue, __base, __i)       \
 220 ({                                              \
 221         (__base) +                              \
 222             ((__i) * (__queue)->data_size);     \
 223 })
 224
 225 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 226                                      struct data_queue *queue)
 227 {
 228         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 229         struct queue_entry_priv_pci_rx *priv_rx;
 230         struct queue_entry_priv_pci_tx *priv_tx;
 231         void *addr;
 232         dma_addr_t dma;
 233         void *desc_addr;
 234         dma_addr_t desc_dma;
 235         void *data_addr;
 236         dma_addr_t data_dma;
 237         unsigned int i;
 238
 239         /*
 240          * Allocate DMA memory for descriptor and buffer.
 241          */
 242         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
 243         if (!addr)
 244                 return -ENOMEM;
 245
 246         memset(addr, 0, dma_size(queue));
 247
 248         /*
 249          * Initialize all queue entries to contain valid addresses.
 250          */
 251         for (i = 0; i < queue->limit; i++) {
 252                 desc_addr = desc_offset(queue, addr, i);
 253                 desc_dma = desc_offset(queue, dma, i);
 254                 data_addr = data_offset(queue, addr, i);
 255                 data_dma = data_offset(queue, dma, i);
 256
 257                 if (queue->qid == QID_RX) {
 258                         priv_rx = queue->entries[i].priv_data;
 259                         priv_rx->desc = desc_addr;
 260                         priv_rx->desc_dma = desc_dma;
 261                         priv_rx->data = data_addr;
 262                         priv_rx->data_dma = data_dma;
 263                 } else {
 264                         priv_tx = queue->entries[i].priv_data;
 265                         priv_tx->desc = desc_addr;
 266                         priv_tx->desc_dma = desc_dma;
 267                         priv_tx->data = data_addr;
 268                         priv_tx->data_dma = data_dma;
 269                 }
 270         }
 271
 272         return 0;
 273 }
 274
 275 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 276                                      struct data_queue *queue)
 277 {
 278         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 279         struct queue_entry_priv_pci_rx *priv_rx;
 280         struct queue_entry_priv_pci_tx *priv_tx;
 281         void *data_addr;
 282         dma_addr_t data_dma;
 283
 284         if (queue->qid == QID_RX) {
 285                 priv_rx = queue->entries[0].priv_data;
 286                 data_addr = priv_rx->data;
 287                 data_dma = priv_rx->data_dma;
 288
 289                 priv_rx->data = NULL;
 290         } else {
 291                 priv_tx = queue->entries[0].priv_data;
 292                 data_addr = priv_tx->data;
 293                 data_dma = priv_tx->data_dma;
 294
 295                 priv_tx->data = NULL;
 296         }
 297
 298         if (data_addr)
 299                 pci_free_consistent(pci_dev, dma_size(queue),
 300                                     data_addr, data_dma);
 301 }
 302
 303 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 304 {
 305         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 306         struct data_queue *queue;
 307         int status;
 308
 309         /*
 310          * Allocate DMA
 311          */
 312         queue_for_each(rt2x00dev, queue) {
 313                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 314                 if (status)
 315                         goto exit;
 316         }
 317
 318         /*
 319          * Register interrupt handler.
 320          */
 321         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 322                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 323         if (status) {
 324                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 325                       pci_dev->irq, status);
 326                 goto exit;
 327         }
 328
 329         return 0;
 330
 331 exit:
 332         queue_for_each(rt2x00dev, queue)
 333                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 334
 335         return status;
 336 }
 337 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 338
 339 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 340 {
 341         struct data_queue *queue;
 342
 343         /*
 344          * Free irq line.
 345          */
 346         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 347
 348         /*
 349          * Free DMA
 350          */
 351         queue_for_each(rt2x00dev, queue)
 352                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 353 }
 354 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 355
 356 /*
 357  * PCI driver handlers.
 358  */
 359 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 360 {
 361         kfree(rt2x00dev->rf);
 362         rt2x00dev->rf = NULL;
 363
 364         kfree(rt2x00dev->eeprom);
 365         rt2x00dev->eeprom = NULL;
 366
 367         if (rt2x00dev->csr.base) {
 368                 iounmap(rt2x00dev->csr.base);
 369                 rt2x00dev->csr.base = NULL;
 370         }
 371 }
 372
 373 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 374 {
 375         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 376
 377         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 378                                       pci_resource_len(pci_dev, 0));
 379         if (!rt2x00dev->csr.base)
 380                 goto exit;
 381
 382         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 383         if (!rt2x00dev->eeprom)
 384                 goto exit;
 385
 386         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 387         if (!rt2x00dev->rf)
 388                 goto exit;
 389
 390         return 0;
 391
 392 exit:
 393         ERROR_PROBE("Failed to allocate registers.\n");
 394
 395         rt2x00pci_free_reg(rt2x00dev);
 396
 397         return -ENOMEM;
 398 }
 399
 400 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 401 {
 402         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 403         struct ieee80211_hw *hw;
 404         struct rt2x00_dev *rt2x00dev;
 405         int retval;
 406
 407         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 408         if (retval) {
 409                 ERROR_PROBE("PCI request regions failed.\n");
 410                 return retval;
 411         }
 412
 413         retval = pci_enable_device(pci_dev);
 414         if (retval) {
 415                 ERROR_PROBE("Enable device failed.\n");
 416                 goto exit_release_regions;
 417         }
 418
 419         pci_set_master(pci_dev);
 420
 421         if (pci_set_mwi(pci_dev))
 422                 ERROR_PROBE("MWI not available.\n");
 423
 424         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 425             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 426                 ERROR_PROBE("PCI DMA not supported.\n");
 427                 retval = -EIO;
 428                 goto exit_disable_device;
 429         }
 430
 431         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 432         if (!hw) {
 433                 ERROR_PROBE("Failed to allocate hardware.\n");
 434                 retval = -ENOMEM;
 435                 goto exit_disable_device;
 436         }
 437
 438         pci_set_drvdata(pci_dev, hw);
 439
 440         rt2x00dev = hw->priv;
 441         rt2x00dev->dev = pci_dev;
 442         rt2x00dev->ops = ops;
 443         rt2x00dev->hw = hw;
 444
 445         retval = rt2x00pci_alloc_reg(rt2x00dev);
 446         if (retval)
 447                 goto exit_free_device;
 448
 449         retval = rt2x00lib_probe_dev(rt2x00dev);
 450         if (retval)
 451                 goto exit_free_reg;
 452
 453         return 0;
 454
 455 exit_free_reg:
 456         rt2x00pci_free_reg(rt2x00dev);
 457
 458 exit_free_device:
 459         ieee80211_free_hw(hw);
 460
 461 exit_disable_device:
 462         if (retval != -EBUSY)
 463                 pci_disable_device(pci_dev);
 464
 465 exit_release_regions:
 466         pci_release_regions(pci_dev);
 467
 468         pci_set_drvdata(pci_dev, NULL);
 469
 470         return retval;
 471 }
 472 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 473
 474 void rt2x00pci_remove(struct pci_dev *pci_dev)
 475 {
 476         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 477         struct rt2x00_dev *rt2x00dev = hw->priv;
 478
 479         /*
 480          * Free all allocated data.
 481          */
 482         rt2x00lib_remove_dev(rt2x00dev);
 483         rt2x00pci_free_reg(rt2x00dev);
 484         ieee80211_free_hw(hw);
 485
 486         /*
 487          * Free the PCI device data.
 488          */
 489         pci_set_drvdata(pci_dev, NULL);
 490         pci_disable_device(pci_dev);
 491         pci_release_regions(pci_dev);
 492 }
 493 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 494
 495 #ifdef CONFIG_PM
 496 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 497 {
 498         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 499         struct rt2x00_dev *rt2x00dev = hw->priv;
 500         int retval;
 501
 502         retval = rt2x00lib_suspend(rt2x00dev, state);
 503         if (retval)
 504                 return retval;
 505
 506         rt2x00pci_free_reg(rt2x00dev);
 507
 508         pci_save_state(pci_dev);
 509         pci_disable_device(pci_dev);
 510         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 511 }
 512 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 513
 514 int rt2x00pci_resume(struct pci_dev *pci_dev)
 515 {
 516         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 517         struct rt2x00_dev *rt2x00dev = hw->priv;
 518         int retval;
 519
 520         if (pci_set_power_state(pci_dev, PCI_D0) ||
 521             pci_enable_device(pci_dev) ||
 522             pci_restore_state(pci_dev)) {
 523                 ERROR(rt2x00dev, "Failed to resume device.\n");
 524                 return -EIO;
 525         }
 526
 527         retval = rt2x00pci_alloc_reg(rt2x00dev);
 528         if (retval)
 529                 return retval;
 530
 531         retval = rt2x00lib_resume(rt2x00dev);
 532         if (retval)
 533                 goto exit_free_reg;
 534
 535         return 0;
 536
 537 exit_free_reg:
 538         rt2x00pci_free_reg(rt2x00dev);
 539
 540         return retval;
 541 }
 542 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 543 #endif /* CONFIG_PM */
 544
 545 /*
 546  * rt2x00pci module information.
 547  */
 548 MODULE_AUTHOR(DRV_PROJECT);
 549 MODULE_VERSION(DRV_VERSION);
 550 MODULE_DESCRIPTION("rt2x00 pci library");
 551 MODULE_LICENSE("GPL");