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->desc = entry_priv->desc;
  65         skbdesc->desc_len = entry->queue->desc_size;
  66         skbdesc->entry = entry;
  67
  68         memcpy(entry_priv->data, entry->skb->data, entry->skb->len);
  69
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  73
  74 /*
  75  * TX/RX data handlers.
  76  */
  77 static void rt2x00pci_rxdone_entry(struct rt2x00_dev *rt2x00dev,
  78                                    struct queue_entry *entry)
  79 {
  80         struct sk_buff *skb;
  81         struct skb_frame_desc *skbdesc;
  82         struct rxdone_entry_desc rxdesc;
  83         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  84
  85         /*
  86          * Allocate a new sk_buffer. If no new buffer available, drop the
  87          * received frame and reuse the existing buffer.
  88          */
  89         skb = rt2x00queue_alloc_skb(entry->queue);
  90         if (!skb)
  91                 return;
  92
  93         /*
  94          * Extract the RXD details.
  95          */
  96         memset(&rxdesc, 0, sizeof(rxdesc));
  97         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
  98
  99         /*
 100          * Copy the received data to the entries' skb.
 101          */
 102         memcpy(entry->skb->data, entry_priv->data, rxdesc.size);
 103         skb_trim(entry->skb, rxdesc.size);
 104
 105         /*
 106          * Fill in skb descriptor
 107          */
 108         skbdesc = get_skb_frame_desc(entry->skb);
 109         memset(skbdesc, 0, sizeof(*skbdesc));
 110         skbdesc->desc = entry_priv->desc;
 111         skbdesc->desc_len = entry->queue->desc_size;
 112         skbdesc->entry = entry;
 113
 114         /*
 115          * Send the frame to rt2x00lib for further processing.
 116          */
 117         rt2x00lib_rxdone(entry, &rxdesc);
 118
 119         /*
 120          * Replace the entries' skb with the newly allocated one.
 121          */
 122         entry->skb = skb;
 123 }
 124
 125 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 126 {
 127         struct data_queue *queue = rt2x00dev->rx;
 128         struct queue_entry *entry;
 129         struct queue_entry_priv_pci *entry_priv;
 130         u32 word;
 131
 132         while (1) {
 133                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 134                 entry_priv = entry->priv_data;
 135                 rt2x00_desc_read(entry_priv->desc, 0, &word);
 136
 137                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 138                         break;
 139
 140                 rt2x00pci_rxdone_entry(rt2x00dev, entry);
 141
 142                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 143                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 144                         rt2x00_desc_write(entry_priv->desc, 0, word);
 145                 }
 146
 147                 rt2x00queue_index_inc(queue, Q_INDEX);
 148         }
 149 }
 150 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 151
 152 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 153                       struct txdone_entry_desc *txdesc)
 154 {
 155         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 156         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 157         u32 word;
 158
 159         rt2x00lib_txdone(entry, txdesc);
 160
 161         /*
 162          * Make this entry available for reuse.
 163          */
 164         entry->flags = 0;
 165
 166         rt2x00_desc_read(entry_priv->desc, 0, &word);
 167         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 168         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 169         rt2x00_desc_write(entry_priv->desc, 0, word);
 170
 171         __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 172         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 173
 174         /*
 175          * If the data queue was below the threshold before the txdone
 176          * handler we must make sure the packet queue in the mac80211 stack
 177          * is reenabled when the txdone handler has finished.
 178          */
 179         if (!rt2x00queue_threshold(entry->queue))
 180                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 181
 182 }
 183 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 184
 185 /*
 186  * Device initialization handlers.
 187  */
 188 #define desc_size(__queue)                      \
 189 ({                                              \
 190          ((__queue)->limit * (__queue)->desc_size);\
 191 })
 192
 193 #define data_size(__queue)                      \
 194 ({                                              \
 195          ((__queue)->limit * (__queue)->data_size);\
 196 })
 197
 198 #define dma_size(__queue)                       \
 199 ({                                              \
 200         data_size(__queue) + desc_size(__queue);\
 201 })
 202
 203 #define desc_offset(__queue, __base, __i)       \
 204 ({                                              \
 205         (__base) + data_size(__queue) +         \
 206             ((__i) * (__queue)->desc_size);     \
 207 })
 208
 209 #define data_offset(__queue, __base, __i)       \
 210 ({                                              \
 211         (__base) +                              \
 212             ((__i) * (__queue)->data_size);     \
 213 })
 214
 215 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 216                                      struct data_queue *queue)
 217 {
 218         struct queue_entry_priv_pci *entry_priv;
 219         void *addr;
 220         dma_addr_t dma;
 221         unsigned int i;
 222
 223         /*
 224          * Allocate DMA memory for descriptor and buffer.
 225          */
 226         addr = dma_alloc_coherent(rt2x00dev->dev, dma_size(queue), &dma,
 227                                   GFP_KERNEL | GFP_DMA);
 228         if (!addr)
 229                 return -ENOMEM;
 230
 231         memset(addr, 0, dma_size(queue));
 232
 233         /*
 234          * Initialize all queue entries to contain valid addresses.
 235          */
 236         for (i = 0; i < queue->limit; i++) {
 237                 entry_priv = queue->entries[i].priv_data;
 238                 entry_priv->desc = desc_offset(queue, addr, i);
 239                 entry_priv->desc_dma = desc_offset(queue, dma, i);
 240                 entry_priv->data = data_offset(queue, addr, i);
 241                 entry_priv->data_dma = data_offset(queue, dma, i);
 242         }
 243
 244         return 0;
 245 }
 246
 247 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 248                                      struct data_queue *queue)
 249 {
 250         struct queue_entry_priv_pci *entry_priv =
 251             queue->entries[0].priv_data;
 252
 253         if (entry_priv->data)
 254                 dma_free_coherent(rt2x00dev->dev, dma_size(queue),
 255                                   entry_priv->data, entry_priv->data_dma);
 256         entry_priv->data = NULL;
 257 }
 258
 259 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 260 {
 261         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 262         struct data_queue *queue;
 263         int status;
 264
 265         /*
 266          * Allocate DMA
 267          */
 268         queue_for_each(rt2x00dev, queue) {
 269                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 270                 if (status)
 271                         goto exit;
 272         }
 273
 274         /*
 275          * Register interrupt handler.
 276          */
 277         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 278                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 279         if (status) {
 280                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 281                       pci_dev->irq, status);
 282                 goto exit;
 283         }
 284
 285         return 0;
 286
 287 exit:
 288         queue_for_each(rt2x00dev, queue)
 289                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 290
 291         return status;
 292 }
 293 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 294
 295 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 296 {
 297         struct data_queue *queue;
 298
 299         /*
 300          * Free irq line.
 301          */
 302         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 303
 304         /*
 305          * Free DMA
 306          */
 307         queue_for_each(rt2x00dev, queue)
 308                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 309 }
 310 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 311
 312 /*
 313  * PCI driver handlers.
 314  */
 315 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 316 {
 317         kfree(rt2x00dev->rf);
 318         rt2x00dev->rf = NULL;
 319
 320         kfree(rt2x00dev->eeprom);
 321         rt2x00dev->eeprom = NULL;
 322
 323         if (rt2x00dev->csr.base) {
 324                 iounmap(rt2x00dev->csr.base);
 325                 rt2x00dev->csr.base = NULL;
 326         }
 327 }
 328
 329 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 330 {
 331         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 332
 333         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 334                                       pci_resource_len(pci_dev, 0));
 335         if (!rt2x00dev->csr.base)
 336                 goto exit;
 337
 338         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 339         if (!rt2x00dev->eeprom)
 340                 goto exit;
 341
 342         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 343         if (!rt2x00dev->rf)
 344                 goto exit;
 345
 346         return 0;
 347
 348 exit:
 349         ERROR_PROBE("Failed to allocate registers.\n");
 350
 351         rt2x00pci_free_reg(rt2x00dev);
 352
 353         return -ENOMEM;
 354 }
 355
 356 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 357 {
 358         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 359         struct ieee80211_hw *hw;
 360         struct rt2x00_dev *rt2x00dev;
 361         int retval;
 362
 363         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 364         if (retval) {
 365                 ERROR_PROBE("PCI request regions failed.\n");
 366                 return retval;
 367         }
 368
 369         retval = pci_enable_device(pci_dev);
 370         if (retval) {
 371                 ERROR_PROBE("Enable device failed.\n");
 372                 goto exit_release_regions;
 373         }
 374
 375         pci_set_master(pci_dev);
 376
 377         if (pci_set_mwi(pci_dev))
 378                 ERROR_PROBE("MWI not available.\n");
 379
 380         if (dma_set_mask(&pci_dev->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->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");