git.oblomov.eu 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->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 ieee80211_hdr *hdr;
  83         struct skb_frame_desc *skbdesc;
  84         struct rxdone_entry_desc rxdesc;
  85         int header_size;
  86         int align;
  87         u32 word;
  88
  89         while (1) {
  90                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  91                 entry_priv = entry->priv_data;
  92                 rt2x00_desc_read(entry_priv->desc, 0, &word);
  93
  94                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
  95                         break;
  96
  97                 memset(&rxdesc, 0, sizeof(rxdesc));
  98                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
  99
 100                 hdr = (struct ieee80211_hdr *)entry_priv->data;
 101                 header_size =
 102                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 103
 104                 /*
 105                  * The data behind the ieee80211 header must be
 106                  * aligned on a 4 byte boundary.
 107                  */
 108                 align = header_size % 4;
 109
 110                 /*
 111                  * Allocate the sk_buffer, initialize it and copy
 112                  * all data into it.
 113                  */
 114                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 115                 if (!entry->skb)
 116                         return;
 117
 118                 skb_reserve(entry->skb, align);
 119                 memcpy(skb_put(entry->skb, rxdesc.size),
 120                        entry_priv->data, rxdesc.size);
 121
 122                 /*
 123                  * Fill in skb descriptor
 124                  */
 125                 skbdesc = get_skb_frame_desc(entry->skb);
 126                 memset(skbdesc, 0, sizeof(*skbdesc));
 127                 skbdesc->desc = entry_priv->desc;
 128                 skbdesc->desc_len = queue->desc_size;
 129                 skbdesc->entry = entry;
 130
 131                 /*
 132                  * Send the frame to rt2x00lib for further processing.
 133                  */
 134                 rt2x00lib_rxdone(entry, &rxdesc);
 135
 136                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 137                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 138                         rt2x00_desc_write(entry_priv->desc, 0, word);
 139                 }
 140
 141                 rt2x00queue_index_inc(queue, Q_INDEX);
 142         }
 143 }
 144 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 145
 146 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 147                       struct txdone_entry_desc *txdesc)
 148 {
 149         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 150         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
 151         u32 word;
 152
 153         rt2x00lib_txdone(entry, txdesc);
 154
 155         /*
 156          * Make this entry available for reuse.
 157          */
 158         entry->flags = 0;
 159
 160         rt2x00_desc_read(entry_priv->desc, 0, &word);
 161         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 162         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 163         rt2x00_desc_write(entry_priv->desc, 0, word);
 164
 165         __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 166         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 167
 168         /*
 169          * If the data queue was below the threshold before the txdone
 170          * handler we must make sure the packet queue in the mac80211 stack
 171          * is reenabled when the txdone handler has finished.
 172          */
 173         if (!rt2x00queue_threshold(entry->queue))
 174                 ieee80211_wake_queue(rt2x00dev->hw, qid);
 175
 176 }
 177 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 178
 179 /*
 180  * Device initialization handlers.
 181  */
 182 #define desc_size(__queue)                      \
 183 ({                                              \
 184          ((__queue)->limit * (__queue)->desc_size);\
 185 })
 186
 187 #define data_size(__queue)                      \
 188 ({                                              \
 189          ((__queue)->limit * (__queue)->data_size);\
 190 })
 191
 192 #define dma_size(__queue)                       \
 193 ({                                              \
 194         data_size(__queue) + desc_size(__queue);\
 195 })
 196
 197 #define desc_offset(__queue, __base, __i)       \
 198 ({                                              \
 199         (__base) + data_size(__queue) +         \
 200             ((__i) * (__queue)->desc_size);     \
 201 })
 202
 203 #define data_offset(__queue, __base, __i)       \
 204 ({                                              \
 205         (__base) +                              \
 206             ((__i) * (__queue)->data_size);     \
 207 })
 208
 209 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 210                                      struct data_queue *queue)
 211 {
 212         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 213         struct queue_entry_priv_pci *entry_priv;
 214         void *addr;
 215         dma_addr_t dma;
 216         unsigned int i;
 217
 218         /*
 219          * Allocate DMA memory for descriptor and buffer.
 220          */
 221         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
 222         if (!addr)
 223                 return -ENOMEM;
 224
 225         memset(addr, 0, dma_size(queue));
 226
 227         /*
 228          * Initialize all queue entries to contain valid addresses.
 229          */
 230         for (i = 0; i < queue->limit; i++) {
 231                 entry_priv = queue->entries[i].priv_data;
 232                 entry_priv->desc = desc_offset(queue, addr, i);
 233                 entry_priv->desc_dma = desc_offset(queue, dma, i);
 234                 entry_priv->data = data_offset(queue, addr, i);
 235                 entry_priv->data_dma = data_offset(queue, dma, i);
 236         }
 237
 238         return 0;
 239 }
 240
 241 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 242                                      struct data_queue *queue)
 243 {
 244         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 245         struct queue_entry_priv_pci *entry_priv =
 246             queue->entries[0].priv_data;
 247
 248         if (entry_priv->data)
 249                 pci_free_consistent(pci_dev, dma_size(queue),
 250                                     entry_priv->data, entry_priv->data_dma);
 251         entry_priv->data = NULL;
 252 }
 253
 254 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 255 {
 256         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 257         struct data_queue *queue;
 258         int status;
 259
 260         /*
 261          * Allocate DMA
 262          */
 263         queue_for_each(rt2x00dev, queue) {
 264                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 265                 if (status)
 266                         goto exit;
 267         }
 268
 269         /*
 270          * Register interrupt handler.
 271          */
 272         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 273                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 274         if (status) {
 275                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 276                       pci_dev->irq, status);
 277                 goto exit;
 278         }
 279
 280         return 0;
 281
 282 exit:
 283         queue_for_each(rt2x00dev, queue)
 284                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 285
 286         return status;
 287 }
 288 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 289
 290 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 291 {
 292         struct data_queue *queue;
 293
 294         /*
 295          * Free irq line.
 296          */
 297         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 298
 299         /*
 300          * Free DMA
 301          */
 302         queue_for_each(rt2x00dev, queue)
 303                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 304 }
 305 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 306
 307 /*
 308  * PCI driver handlers.
 309  */
 310 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 311 {
 312         kfree(rt2x00dev->rf);
 313         rt2x00dev->rf = NULL;
 314
 315         kfree(rt2x00dev->eeprom);
 316         rt2x00dev->eeprom = NULL;
 317
 318         if (rt2x00dev->csr.base) {
 319                 iounmap(rt2x00dev->csr.base);
 320                 rt2x00dev->csr.base = NULL;
 321         }
 322 }
 323
 324 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 325 {
 326         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 327
 328         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 329                                       pci_resource_len(pci_dev, 0));
 330         if (!rt2x00dev->csr.base)
 331                 goto exit;
 332
 333         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 334         if (!rt2x00dev->eeprom)
 335                 goto exit;
 336
 337         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 338         if (!rt2x00dev->rf)
 339                 goto exit;
 340
 341         return 0;
 342
 343 exit:
 344         ERROR_PROBE("Failed to allocate registers.\n");
 345
 346         rt2x00pci_free_reg(rt2x00dev);
 347
 348         return -ENOMEM;
 349 }
 350
 351 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 352 {
 353         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 354         struct ieee80211_hw *hw;
 355         struct rt2x00_dev *rt2x00dev;
 356         int retval;
 357
 358         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 359         if (retval) {
 360                 ERROR_PROBE("PCI request regions failed.\n");
 361                 return retval;
 362         }
 363
 364         retval = pci_enable_device(pci_dev);
 365         if (retval) {
 366                 ERROR_PROBE("Enable device failed.\n");
 367                 goto exit_release_regions;
 368         }
 369
 370         pci_set_master(pci_dev);
 371
 372         if (pci_set_mwi(pci_dev))
 373                 ERROR_PROBE("MWI not available.\n");
 374
 375         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 376             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 377                 ERROR_PROBE("PCI DMA not supported.\n");
 378                 retval = -EIO;
 379                 goto exit_disable_device;
 380         }
 381
 382         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 383         if (!hw) {
 384                 ERROR_PROBE("Failed to allocate hardware.\n");
 385                 retval = -ENOMEM;
 386                 goto exit_disable_device;
 387         }
 388
 389         pci_set_drvdata(pci_dev, hw);
 390
 391         rt2x00dev = hw->priv;
 392         rt2x00dev->dev = pci_dev;
 393         rt2x00dev->ops = ops;
 394         rt2x00dev->hw = hw;
 395
 396         retval = rt2x00pci_alloc_reg(rt2x00dev);
 397         if (retval)
 398                 goto exit_free_device;
 399
 400         retval = rt2x00lib_probe_dev(rt2x00dev);
 401         if (retval)
 402                 goto exit_free_reg;
 403
 404         return 0;
 405
 406 exit_free_reg:
 407         rt2x00pci_free_reg(rt2x00dev);
 408
 409 exit_free_device:
 410         ieee80211_free_hw(hw);
 411
 412 exit_disable_device:
 413         if (retval != -EBUSY)
 414                 pci_disable_device(pci_dev);
 415
 416 exit_release_regions:
 417         pci_release_regions(pci_dev);
 418
 419         pci_set_drvdata(pci_dev, NULL);
 420
 421         return retval;
 422 }
 423 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 424
 425 void rt2x00pci_remove(struct pci_dev *pci_dev)
 426 {
 427         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 428         struct rt2x00_dev *rt2x00dev = hw->priv;
 429
 430         /*
 431          * Free all allocated data.
 432          */
 433         rt2x00lib_remove_dev(rt2x00dev);
 434         rt2x00pci_free_reg(rt2x00dev);
 435         ieee80211_free_hw(hw);
 436
 437         /*
 438          * Free the PCI device data.
 439          */
 440         pci_set_drvdata(pci_dev, NULL);
 441         pci_disable_device(pci_dev);
 442         pci_release_regions(pci_dev);
 443 }
 444 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 445
 446 #ifdef CONFIG_PM
 447 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 448 {
 449         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 450         struct rt2x00_dev *rt2x00dev = hw->priv;
 451         int retval;
 452
 453         retval = rt2x00lib_suspend(rt2x00dev, state);
 454         if (retval)
 455                 return retval;
 456
 457         rt2x00pci_free_reg(rt2x00dev);
 458
 459         pci_save_state(pci_dev);
 460         pci_disable_device(pci_dev);
 461         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 462 }
 463 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 464
 465 int rt2x00pci_resume(struct pci_dev *pci_dev)
 466 {
 467         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 468         struct rt2x00_dev *rt2x00dev = hw->priv;
 469         int retval;
 470
 471         if (pci_set_power_state(pci_dev, PCI_D0) ||
 472             pci_enable_device(pci_dev) ||
 473             pci_restore_state(pci_dev)) {
 474                 ERROR(rt2x00dev, "Failed to resume device.\n");
 475                 return -EIO;
 476         }
 477
 478         retval = rt2x00pci_alloc_reg(rt2x00dev);
 479         if (retval)
 480                 return retval;
 481
 482         retval = rt2x00lib_resume(rt2x00dev);
 483         if (retval)
 484                 goto exit_free_reg;
 485
 486         return 0;
 487
 488 exit_free_reg:
 489         rt2x00pci_free_reg(rt2x00dev);
 490
 491         return retval;
 492 }
 493 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 494 #endif /* CONFIG_PM */
 495
 496 /*
 497  * rt2x00pci module information.
 498  */
 499 MODULE_AUTHOR(DRV_PROJECT);
 500 MODULE_VERSION(DRV_VERSION);
 501 MODULE_DESCRIPTION("rt2x00 pci library");
 502 MODULE_LICENSE("GPL");