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