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         rt2x00queue_map_txskb(entry->queue->rt2x00dev, entry->skb);
  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         u32 word;
  84
  85         while (1) {
  86                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  87                 entry_priv = entry->priv_data;
  88                 rt2x00_desc_read(entry_priv->desc, 0, &word);
  89
  90                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
  91                         break;
  92
  93                 /*
  94                  * Fill in desc fields of the skb descriptor
  95                  */
  96                 skbdesc = get_skb_frame_desc(entry->skb);
  97                 skbdesc->desc = entry_priv->desc;
  98                 skbdesc->desc_len = entry->queue->desc_size;
  99
 100                 /*
 101                  * Send the frame to rt2x00lib for further processing.
 102                  */
 103                 rt2x00lib_rxdone(rt2x00dev, entry);
 104
 105                 /*
 106                  * Reset the RXD for this entry.
 107                  */
 108                 rt2x00dev->ops->lib->init_rxentry(rt2x00dev, entry);
 109
 110                 rt2x00queue_index_inc(queue, Q_INDEX);
 111         }
 112 }
 113 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 114
 115 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 116                       struct txdone_entry_desc *txdesc)
 117 {
 118         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 119         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 120         u32 word;
 121
 122         /*
 123          * Unmap the skb.
 124          */
 125         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 126
 127         rt2x00lib_txdone(entry, txdesc);
 128
 129         /*
 130          * Make this entry available for reuse.
 131          */
 132         entry->flags = 0;
 133
 134         rt2x00_desc_read(entry_priv->desc, 0, &word);
 135         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 136         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 137         rt2x00_desc_write(entry_priv->desc, 0, word);
 138
 139         __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 140         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 141
 142         /*
 143          * If the data queue was below the threshold before the txdone
 144          * handler we must make sure the packet queue in the mac80211 stack
 145          * is reenabled when the txdone handler has finished.
 146          */
 147         if (!rt2x00queue_threshold(entry->queue))
 148                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 149
 150 }
 151 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 152
 153 /*
 154  * Device initialization handlers.
 155  */
 156 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 157                                      struct data_queue *queue)
 158 {
 159         struct queue_entry_priv_pci *entry_priv;
 160         void *addr;
 161         dma_addr_t dma;
 162         unsigned int i;
 163
 164         /*
 165          * Allocate DMA memory for descriptor and buffer.
 166          */
 167         addr = dma_alloc_coherent(rt2x00dev->dev,
 168                                   queue->limit * queue->desc_size,
 169                                   &dma, GFP_KERNEL | GFP_DMA);
 170         if (!addr)
 171                 return -ENOMEM;
 172
 173         memset(addr, 0, queue->limit * queue->desc_size);
 174
 175         /*
 176          * Initialize all queue entries to contain valid addresses.
 177          */
 178         for (i = 0; i < queue->limit; i++) {
 179                 entry_priv = queue->entries[i].priv_data;
 180                 entry_priv->desc = addr + i * queue->desc_size;
 181                 entry_priv->desc_dma = dma + i * queue->desc_size;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 188                                      struct data_queue *queue)
 189 {
 190         struct queue_entry_priv_pci *entry_priv =
 191             queue->entries[0].priv_data;
 192
 193         if (entry_priv->desc)
 194                 dma_free_coherent(rt2x00dev->dev,
 195                                   queue->limit * queue->desc_size,
 196                                   entry_priv->desc, entry_priv->desc_dma);
 197         entry_priv->desc = NULL;
 198 }
 199
 200 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 201 {
 202         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 203         struct data_queue *queue;
 204         int status;
 205
 206         /*
 207          * Allocate DMA
 208          */
 209         queue_for_each(rt2x00dev, queue) {
 210                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 211                 if (status)
 212                         goto exit;
 213         }
 214
 215         /*
 216          * Register interrupt handler.
 217          */
 218         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 219                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 220         if (status) {
 221                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 222                       pci_dev->irq, status);
 223                 goto exit;
 224         }
 225
 226         return 0;
 227
 228 exit:
 229         queue_for_each(rt2x00dev, queue)
 230                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 231
 232         return status;
 233 }
 234 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 235
 236 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 237 {
 238         struct data_queue *queue;
 239
 240         /*
 241          * Free irq line.
 242          */
 243         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 244
 245         /*
 246          * Free DMA
 247          */
 248         queue_for_each(rt2x00dev, queue)
 249                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 250 }
 251 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 252
 253 /*
 254  * PCI driver handlers.
 255  */
 256 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 257 {
 258         kfree(rt2x00dev->rf);
 259         rt2x00dev->rf = NULL;
 260
 261         kfree(rt2x00dev->eeprom);
 262         rt2x00dev->eeprom = NULL;
 263
 264         if (rt2x00dev->csr.base) {
 265                 iounmap(rt2x00dev->csr.base);
 266                 rt2x00dev->csr.base = NULL;
 267         }
 268 }
 269
 270 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 271 {
 272         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 273
 274         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 275                                       pci_resource_len(pci_dev, 0));
 276         if (!rt2x00dev->csr.base)
 277                 goto exit;
 278
 279         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 280         if (!rt2x00dev->eeprom)
 281                 goto exit;
 282
 283         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 284         if (!rt2x00dev->rf)
 285                 goto exit;
 286
 287         return 0;
 288
 289 exit:
 290         ERROR_PROBE("Failed to allocate registers.\n");
 291
 292         rt2x00pci_free_reg(rt2x00dev);
 293
 294         return -ENOMEM;
 295 }
 296
 297 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 298 {
 299         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 300         struct ieee80211_hw *hw;
 301         struct rt2x00_dev *rt2x00dev;
 302         int retval;
 303
 304         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 305         if (retval) {
 306                 ERROR_PROBE("PCI request regions failed.\n");
 307                 return retval;
 308         }
 309
 310         retval = pci_enable_device(pci_dev);
 311         if (retval) {
 312                 ERROR_PROBE("Enable device failed.\n");
 313                 goto exit_release_regions;
 314         }
 315
 316         pci_set_master(pci_dev);
 317
 318         if (pci_set_mwi(pci_dev))
 319                 ERROR_PROBE("MWI not available.\n");
 320
 321         if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) {
 322                 ERROR_PROBE("PCI DMA not supported.\n");
 323                 retval = -EIO;
 324                 goto exit_disable_device;
 325         }
 326
 327         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 328         if (!hw) {
 329                 ERROR_PROBE("Failed to allocate hardware.\n");
 330                 retval = -ENOMEM;
 331                 goto exit_disable_device;
 332         }
 333
 334         pci_set_drvdata(pci_dev, hw);
 335
 336         rt2x00dev = hw->priv;
 337         rt2x00dev->dev = &pci_dev->dev;
 338         rt2x00dev->ops = ops;
 339         rt2x00dev->hw = hw;
 340
 341         retval = rt2x00pci_alloc_reg(rt2x00dev);
 342         if (retval)
 343                 goto exit_free_device;
 344
 345         retval = rt2x00lib_probe_dev(rt2x00dev);
 346         if (retval)
 347                 goto exit_free_reg;
 348
 349         return 0;
 350
 351 exit_free_reg:
 352         rt2x00pci_free_reg(rt2x00dev);
 353
 354 exit_free_device:
 355         ieee80211_free_hw(hw);
 356
 357 exit_disable_device:
 358         if (retval != -EBUSY)
 359                 pci_disable_device(pci_dev);
 360
 361 exit_release_regions:
 362         pci_release_regions(pci_dev);
 363
 364         pci_set_drvdata(pci_dev, NULL);
 365
 366         return retval;
 367 }
 368 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 369
 370 void rt2x00pci_remove(struct pci_dev *pci_dev)
 371 {
 372         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 373         struct rt2x00_dev *rt2x00dev = hw->priv;
 374
 375         /*
 376          * Free all allocated data.
 377          */
 378         rt2x00lib_remove_dev(rt2x00dev);
 379         rt2x00pci_free_reg(rt2x00dev);
 380         ieee80211_free_hw(hw);
 381
 382         /*
 383          * Free the PCI device data.
 384          */
 385         pci_set_drvdata(pci_dev, NULL);
 386         pci_disable_device(pci_dev);
 387         pci_release_regions(pci_dev);
 388 }
 389 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 390
 391 #ifdef CONFIG_PM
 392 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 393 {
 394         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 395         struct rt2x00_dev *rt2x00dev = hw->priv;
 396         int retval;
 397
 398         retval = rt2x00lib_suspend(rt2x00dev, state);
 399         if (retval)
 400                 return retval;
 401
 402         rt2x00pci_free_reg(rt2x00dev);
 403
 404         pci_save_state(pci_dev);
 405         pci_disable_device(pci_dev);
 406         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 407 }
 408 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 409
 410 int rt2x00pci_resume(struct pci_dev *pci_dev)
 411 {
 412         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 413         struct rt2x00_dev *rt2x00dev = hw->priv;
 414         int retval;
 415
 416         if (pci_set_power_state(pci_dev, PCI_D0) ||
 417             pci_enable_device(pci_dev) ||
 418             pci_restore_state(pci_dev)) {
 419                 ERROR(rt2x00dev, "Failed to resume device.\n");
 420                 return -EIO;
 421         }
 422
 423         retval = rt2x00pci_alloc_reg(rt2x00dev);
 424         if (retval)
 425                 return retval;
 426
 427         retval = rt2x00lib_resume(rt2x00dev);
 428         if (retval)
 429                 goto exit_free_reg;
 430
 431         return 0;
 432
 433 exit_free_reg:
 434         rt2x00pci_free_reg(rt2x00dev);
 435
 436         return retval;
 437 }
 438 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 439 #endif /* CONFIG_PM */
 440
 441 /*
 442  * rt2x00pci module information.
 443  */
 444 MODULE_AUTHOR(DRV_PROJECT);
 445 MODULE_VERSION(DRV_VERSION);
 446 MODULE_DESCRIPTION("rt2x00 pci library");
 447 MODULE_LICENSE("GPL");