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 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  78 {
  79         struct data_queue *queue = rt2x00dev->rx;
  80         struct queue_entry *entry;
  81         struct queue_entry_priv_pci *entry_priv;
  82         struct skb_frame_desc *skbdesc;
  83         struct rxdone_entry_desc rxdesc;
  84         u32 word;
  85
  86         while (1) {
  87                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  88                 entry_priv = entry->priv_data;
  89                 rt2x00_desc_read(entry_priv->desc, 0, &word);
  90
  91                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
  92                         break;
  93
  94                 memset(&rxdesc, 0, sizeof(rxdesc));
  95                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
  96
  97                 /*
  98                  * Allocate the sk_buffer and copy all data into it.
  99                  */
 100                 entry->skb = rt2x00queue_alloc_rxskb(queue);
 101                 if (!entry->skb)
 102                         return;
 103
 104                 memcpy(entry->skb->data, entry_priv->data, rxdesc.size);
 105                 skb_trim(entry->skb, rxdesc.size);
 106
 107                 /*
 108                  * Fill in skb descriptor
 109                  */
 110                 skbdesc = get_skb_frame_desc(entry->skb);
 111                 memset(skbdesc, 0, sizeof(*skbdesc));
 112                 skbdesc->desc = entry_priv->desc;
 113                 skbdesc->desc_len = queue->desc_size;
 114                 skbdesc->entry = entry;
 115
 116                 /*
 117                  * Send the frame to rt2x00lib for further processing.
 118                  */
 119                 rt2x00lib_rxdone(entry, &rxdesc);
 120
 121                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 122                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 123                         rt2x00_desc_write(entry_priv->desc, 0, word);
 124                 }
 125
 126                 rt2x00queue_index_inc(queue, Q_INDEX);
 127         }
 128 }
 129 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 130
 131 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 132                       struct txdone_entry_desc *txdesc)
 133 {
 134         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 135         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 136         u32 word;
 137
 138         rt2x00lib_txdone(entry, txdesc);
 139
 140         /*
 141          * Make this entry available for reuse.
 142          */
 143         entry->flags = 0;
 144
 145         rt2x00_desc_read(entry_priv->desc, 0, &word);
 146         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 147         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 148         rt2x00_desc_write(entry_priv->desc, 0, word);
 149
 150         __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 151         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 152
 153         /*
 154          * If the data queue was below the threshold before the txdone
 155          * handler we must make sure the packet queue in the mac80211 stack
 156          * is reenabled when the txdone handler has finished.
 157          */
 158         if (!rt2x00queue_threshold(entry->queue))
 159                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 160
 161 }
 162 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 163
 164 /*
 165  * Device initialization handlers.
 166  */
 167 #define desc_size(__queue)                      \
 168 ({                                              \
 169          ((__queue)->limit * (__queue)->desc_size);\
 170 })
 171
 172 #define data_size(__queue)                      \
 173 ({                                              \
 174          ((__queue)->limit * (__queue)->data_size);\
 175 })
 176
 177 #define dma_size(__queue)                       \
 178 ({                                              \
 179         data_size(__queue) + desc_size(__queue);\
 180 })
 181
 182 #define desc_offset(__queue, __base, __i)       \
 183 ({                                              \
 184         (__base) + data_size(__queue) +         \
 185             ((__i) * (__queue)->desc_size);     \
 186 })
 187
 188 #define data_offset(__queue, __base, __i)       \
 189 ({                                              \
 190         (__base) +                              \
 191             ((__i) * (__queue)->data_size);     \
 192 })
 193
 194 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 195                                      struct data_queue *queue)
 196 {
 197         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 198         struct queue_entry_priv_pci *entry_priv;
 199         void *addr;
 200         dma_addr_t dma;
 201         unsigned int i;
 202
 203         /*
 204          * Allocate DMA memory for descriptor and buffer.
 205          */
 206         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
 207         if (!addr)
 208                 return -ENOMEM;
 209
 210         memset(addr, 0, dma_size(queue));
 211
 212         /*
 213          * Initialize all queue entries to contain valid addresses.
 214          */
 215         for (i = 0; i < queue->limit; i++) {
 216                 entry_priv = queue->entries[i].priv_data;
 217                 entry_priv->desc = desc_offset(queue, addr, i);
 218                 entry_priv->desc_dma = desc_offset(queue, dma, i);
 219                 entry_priv->data = data_offset(queue, addr, i);
 220                 entry_priv->data_dma = data_offset(queue, dma, i);
 221         }
 222
 223         return 0;
 224 }
 225
 226 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 227                                      struct data_queue *queue)
 228 {
 229         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 230         struct queue_entry_priv_pci *entry_priv =
 231             queue->entries[0].priv_data;
 232
 233         if (entry_priv->data)
 234                 pci_free_consistent(pci_dev, dma_size(queue),
 235                                     entry_priv->data, entry_priv->data_dma);
 236         entry_priv->data = NULL;
 237 }
 238
 239 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 240 {
 241         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 242         struct data_queue *queue;
 243         int status;
 244
 245         /*
 246          * Allocate DMA
 247          */
 248         queue_for_each(rt2x00dev, queue) {
 249                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 250                 if (status)
 251                         goto exit;
 252         }
 253
 254         /*
 255          * Register interrupt handler.
 256          */
 257         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 258                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 259         if (status) {
 260                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 261                       pci_dev->irq, status);
 262                 goto exit;
 263         }
 264
 265         return 0;
 266
 267 exit:
 268         queue_for_each(rt2x00dev, queue)
 269                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 270
 271         return status;
 272 }
 273 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 274
 275 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 276 {
 277         struct data_queue *queue;
 278
 279         /*
 280          * Free irq line.
 281          */
 282         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 283
 284         /*
 285          * Free DMA
 286          */
 287         queue_for_each(rt2x00dev, queue)
 288                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 289 }
 290 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 291
 292 /*
 293  * PCI driver handlers.
 294  */
 295 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 296 {
 297         kfree(rt2x00dev->rf);
 298         rt2x00dev->rf = NULL;
 299
 300         kfree(rt2x00dev->eeprom);
 301         rt2x00dev->eeprom = NULL;
 302
 303         if (rt2x00dev->csr.base) {
 304                 iounmap(rt2x00dev->csr.base);
 305                 rt2x00dev->csr.base = NULL;
 306         }
 307 }
 308
 309 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 310 {
 311         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 312
 313         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 314                                       pci_resource_len(pci_dev, 0));
 315         if (!rt2x00dev->csr.base)
 316                 goto exit;
 317
 318         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 319         if (!rt2x00dev->eeprom)
 320                 goto exit;
 321
 322         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 323         if (!rt2x00dev->rf)
 324                 goto exit;
 325
 326         return 0;
 327
 328 exit:
 329         ERROR_PROBE("Failed to allocate registers.\n");
 330
 331         rt2x00pci_free_reg(rt2x00dev);
 332
 333         return -ENOMEM;
 334 }
 335
 336 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 337 {
 338         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 339         struct ieee80211_hw *hw;
 340         struct rt2x00_dev *rt2x00dev;
 341         int retval;
 342
 343         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 344         if (retval) {
 345                 ERROR_PROBE("PCI request regions failed.\n");
 346                 return retval;
 347         }
 348
 349         retval = pci_enable_device(pci_dev);
 350         if (retval) {
 351                 ERROR_PROBE("Enable device failed.\n");
 352                 goto exit_release_regions;
 353         }
 354
 355         pci_set_master(pci_dev);
 356
 357         if (pci_set_mwi(pci_dev))
 358                 ERROR_PROBE("MWI not available.\n");
 359
 360         if (pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 361                 ERROR_PROBE("PCI DMA not supported.\n");
 362                 retval = -EIO;
 363                 goto exit_disable_device;
 364         }
 365
 366         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 367         if (!hw) {
 368                 ERROR_PROBE("Failed to allocate hardware.\n");
 369                 retval = -ENOMEM;
 370                 goto exit_disable_device;
 371         }
 372
 373         pci_set_drvdata(pci_dev, hw);
 374
 375         rt2x00dev = hw->priv;
 376         rt2x00dev->dev = pci_dev;
 377         rt2x00dev->ops = ops;
 378         rt2x00dev->hw = hw;
 379
 380         retval = rt2x00pci_alloc_reg(rt2x00dev);
 381         if (retval)
 382                 goto exit_free_device;
 383
 384         retval = rt2x00lib_probe_dev(rt2x00dev);
 385         if (retval)
 386                 goto exit_free_reg;
 387
 388         return 0;
 389
 390 exit_free_reg:
 391         rt2x00pci_free_reg(rt2x00dev);
 392
 393 exit_free_device:
 394         ieee80211_free_hw(hw);
 395
 396 exit_disable_device:
 397         if (retval != -EBUSY)
 398                 pci_disable_device(pci_dev);
 399
 400 exit_release_regions:
 401         pci_release_regions(pci_dev);
 402
 403         pci_set_drvdata(pci_dev, NULL);
 404
 405         return retval;
 406 }
 407 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 408
 409 void rt2x00pci_remove(struct pci_dev *pci_dev)
 410 {
 411         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 412         struct rt2x00_dev *rt2x00dev = hw->priv;
 413
 414         /*
 415          * Free all allocated data.
 416          */
 417         rt2x00lib_remove_dev(rt2x00dev);
 418         rt2x00pci_free_reg(rt2x00dev);
 419         ieee80211_free_hw(hw);
 420
 421         /*
 422          * Free the PCI device data.
 423          */
 424         pci_set_drvdata(pci_dev, NULL);
 425         pci_disable_device(pci_dev);
 426         pci_release_regions(pci_dev);
 427 }
 428 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 429
 430 #ifdef CONFIG_PM
 431 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 432 {
 433         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 434         struct rt2x00_dev *rt2x00dev = hw->priv;
 435         int retval;
 436
 437         retval = rt2x00lib_suspend(rt2x00dev, state);
 438         if (retval)
 439                 return retval;
 440
 441         rt2x00pci_free_reg(rt2x00dev);
 442
 443         pci_save_state(pci_dev);
 444         pci_disable_device(pci_dev);
 445         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 446 }
 447 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 448
 449 int rt2x00pci_resume(struct pci_dev *pci_dev)
 450 {
 451         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 452         struct rt2x00_dev *rt2x00dev = hw->priv;
 453         int retval;
 454
 455         if (pci_set_power_state(pci_dev, PCI_D0) ||
 456             pci_enable_device(pci_dev) ||
 457             pci_restore_state(pci_dev)) {
 458                 ERROR(rt2x00dev, "Failed to resume device.\n");
 459                 return -EIO;
 460         }
 461
 462         retval = rt2x00pci_alloc_reg(rt2x00dev);
 463         if (retval)
 464                 return retval;
 465
 466         retval = rt2x00lib_resume(rt2x00dev);
 467         if (retval)
 468                 goto exit_free_reg;
 469
 470         return 0;
 471
 472 exit_free_reg:
 473         rt2x00pci_free_reg(rt2x00dev);
 474
 475         return retval;
 476 }
 477 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 478 #endif /* CONFIG_PM */
 479
 480 /*
 481  * rt2x00pci module information.
 482  */
 483 MODULE_AUTHOR(DRV_PROJECT);
 484 MODULE_VERSION(DRV_VERSION);
 485 MODULE_DESCRIPTION("rt2x00 pci library");
 486 MODULE_LICENSE("GPL");