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 queue_entry_priv_pci *entry_priv;
 198         void *addr;
 199         dma_addr_t dma;
 200         unsigned int i;
 201
 202         /*
 203          * Allocate DMA memory for descriptor and buffer.
 204          */
 205         addr = dma_alloc_coherent(rt2x00dev->dev, dma_size(queue), &dma,
 206                                   GFP_KERNEL | GFP_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 queue_entry_priv_pci *entry_priv =
 230             queue->entries[0].priv_data;
 231
 232         if (entry_priv->data)
 233                 dma_free_coherent(rt2x00dev->dev, dma_size(queue),
 234                                   entry_priv->data, entry_priv->data_dma);
 235         entry_priv->data = NULL;
 236 }
 237
 238 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 239 {
 240         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 241         struct data_queue *queue;
 242         int status;
 243
 244         /*
 245          * Allocate DMA
 246          */
 247         queue_for_each(rt2x00dev, queue) {
 248                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 249                 if (status)
 250                         goto exit;
 251         }
 252
 253         /*
 254          * Register interrupt handler.
 255          */
 256         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 257                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 258         if (status) {
 259                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 260                       pci_dev->irq, status);
 261                 goto exit;
 262         }
 263
 264         return 0;
 265
 266 exit:
 267         queue_for_each(rt2x00dev, queue)
 268                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 269
 270         return status;
 271 }
 272 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 273
 274 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 275 {
 276         struct data_queue *queue;
 277
 278         /*
 279          * Free irq line.
 280          */
 281         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 282
 283         /*
 284          * Free DMA
 285          */
 286         queue_for_each(rt2x00dev, queue)
 287                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 288 }
 289 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 290
 291 /*
 292  * PCI driver handlers.
 293  */
 294 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 295 {
 296         kfree(rt2x00dev->rf);
 297         rt2x00dev->rf = NULL;
 298
 299         kfree(rt2x00dev->eeprom);
 300         rt2x00dev->eeprom = NULL;
 301
 302         if (rt2x00dev->csr.base) {
 303                 iounmap(rt2x00dev->csr.base);
 304                 rt2x00dev->csr.base = NULL;
 305         }
 306 }
 307
 308 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 309 {
 310         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 311
 312         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 313                                       pci_resource_len(pci_dev, 0));
 314         if (!rt2x00dev->csr.base)
 315                 goto exit;
 316
 317         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 318         if (!rt2x00dev->eeprom)
 319                 goto exit;
 320
 321         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 322         if (!rt2x00dev->rf)
 323                 goto exit;
 324
 325         return 0;
 326
 327 exit:
 328         ERROR_PROBE("Failed to allocate registers.\n");
 329
 330         rt2x00pci_free_reg(rt2x00dev);
 331
 332         return -ENOMEM;
 333 }
 334
 335 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 336 {
 337         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 338         struct ieee80211_hw *hw;
 339         struct rt2x00_dev *rt2x00dev;
 340         int retval;
 341
 342         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 343         if (retval) {
 344                 ERROR_PROBE("PCI request regions failed.\n");
 345                 return retval;
 346         }
 347
 348         retval = pci_enable_device(pci_dev);
 349         if (retval) {
 350                 ERROR_PROBE("Enable device failed.\n");
 351                 goto exit_release_regions;
 352         }
 353
 354         pci_set_master(pci_dev);
 355
 356         if (pci_set_mwi(pci_dev))
 357                 ERROR_PROBE("MWI not available.\n");
 358
 359         if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) {
 360                 ERROR_PROBE("PCI DMA not supported.\n");
 361                 retval = -EIO;
 362                 goto exit_disable_device;
 363         }
 364
 365         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 366         if (!hw) {
 367                 ERROR_PROBE("Failed to allocate hardware.\n");
 368                 retval = -ENOMEM;
 369                 goto exit_disable_device;
 370         }
 371
 372         pci_set_drvdata(pci_dev, hw);
 373
 374         rt2x00dev = hw->priv;
 375         rt2x00dev->dev = &pci_dev->dev;
 376         rt2x00dev->ops = ops;
 377         rt2x00dev->hw = hw;
 378
 379         retval = rt2x00pci_alloc_reg(rt2x00dev);
 380         if (retval)
 381                 goto exit_free_device;
 382
 383         retval = rt2x00lib_probe_dev(rt2x00dev);
 384         if (retval)
 385                 goto exit_free_reg;
 386
 387         return 0;
 388
 389 exit_free_reg:
 390         rt2x00pci_free_reg(rt2x00dev);
 391
 392 exit_free_device:
 393         ieee80211_free_hw(hw);
 394
 395 exit_disable_device:
 396         if (retval != -EBUSY)
 397                 pci_disable_device(pci_dev);
 398
 399 exit_release_regions:
 400         pci_release_regions(pci_dev);
 401
 402         pci_set_drvdata(pci_dev, NULL);
 403
 404         return retval;
 405 }
 406 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 407
 408 void rt2x00pci_remove(struct pci_dev *pci_dev)
 409 {
 410         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 411         struct rt2x00_dev *rt2x00dev = hw->priv;
 412
 413         /*
 414          * Free all allocated data.
 415          */
 416         rt2x00lib_remove_dev(rt2x00dev);
 417         rt2x00pci_free_reg(rt2x00dev);
 418         ieee80211_free_hw(hw);
 419
 420         /*
 421          * Free the PCI device data.
 422          */
 423         pci_set_drvdata(pci_dev, NULL);
 424         pci_disable_device(pci_dev);
 425         pci_release_regions(pci_dev);
 426 }
 427 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 428
 429 #ifdef CONFIG_PM
 430 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 431 {
 432         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 433         struct rt2x00_dev *rt2x00dev = hw->priv;
 434         int retval;
 435
 436         retval = rt2x00lib_suspend(rt2x00dev, state);
 437         if (retval)
 438                 return retval;
 439
 440         rt2x00pci_free_reg(rt2x00dev);
 441
 442         pci_save_state(pci_dev);
 443         pci_disable_device(pci_dev);
 444         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 445 }
 446 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 447
 448 int rt2x00pci_resume(struct pci_dev *pci_dev)
 449 {
 450         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 451         struct rt2x00_dev *rt2x00dev = hw->priv;
 452         int retval;
 453
 454         if (pci_set_power_state(pci_dev, PCI_D0) ||
 455             pci_enable_device(pci_dev) ||
 456             pci_restore_state(pci_dev)) {
 457                 ERROR(rt2x00dev, "Failed to resume device.\n");
 458                 return -EIO;
 459         }
 460
 461         retval = rt2x00pci_alloc_reg(rt2x00dev);
 462         if (retval)
 463                 return retval;
 464
 465         retval = rt2x00lib_resume(rt2x00dev);
 466         if (retval)
 467                 goto exit_free_reg;
 468
 469         return 0;
 470
 471 exit_free_reg:
 472         rt2x00pci_free_reg(rt2x00dev);
 473
 474         return retval;
 475 }
 476 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 477 #endif /* CONFIG_PM */
 478
 479 /*
 480  * rt2x00pci module information.
 481  */
 482 MODULE_AUTHOR(DRV_PROJECT);
 483 MODULE_VERSION(DRV_VERSION);
 484 MODULE_DESCRIPTION("rt2x00 pci library");
 485 MODULE_LICENSE("GPL");