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 rt2x00_dev *rt2x00dev,
  38                             struct data_queue *queue, struct sk_buff *skb,
  39                             struct ieee80211_tx_control *control)
  40 {
  41         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
  42         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  43         struct skb_frame_desc *skbdesc;
  44         struct txentry_desc txdesc;
  45         u32 word;
  46
  47         if (rt2x00queue_full(queue))
  48                 return -EINVAL;
  49
  50         rt2x00_desc_read(entry_priv->desc, 0, &word);
  51
  52         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  53             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  54                 ERROR(rt2x00dev,
  55                       "Arrived at non-free entry in the non-full queue %d.\n"
  56                       "Please file bug report to %s.\n",
  57                       entry->queue->qid, DRV_PROJECT);
  58                 return -EINVAL;
  59         }
  60
  61         /*
  62          * Copy all TX descriptor information into txdesc,
  63          * after that we are free to use the skb->cb array
  64          * for our information.
  65          */
  66         entry->skb = skb;
  67         rt2x00queue_create_tx_descriptor(entry, &txdesc, control);
  68
  69         /*
  70          * Fill in skb descriptor
  71          */
  72         skbdesc = get_skb_frame_desc(skb);
  73         skbdesc->data = skb->data;
  74         skbdesc->data_len = skb->len;
  75         skbdesc->desc = entry_priv->desc;
  76         skbdesc->desc_len = queue->desc_size;
  77         skbdesc->entry = entry;
  78
  79         memcpy(&entry_priv->control, control, sizeof(entry_priv->control));
  80         memcpy(entry_priv->data, skb->data, skb->len);
  81
  82         rt2x00queue_write_tx_descriptor(entry, &txdesc);
  83         rt2x00queue_index_inc(queue, Q_INDEX);
  84
  85         return 0;
  86 }
  87 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  88
  89 /*
  90  * TX/RX data handlers.
  91  */
  92 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  93 {
  94         struct data_queue *queue = rt2x00dev->rx;
  95         struct queue_entry *entry;
  96         struct queue_entry_priv_pci *entry_priv;
  97         struct ieee80211_hdr *hdr;
  98         struct skb_frame_desc *skbdesc;
  99         struct rxdone_entry_desc rxdesc;
 100         int header_size;
 101         int align;
 102         u32 word;
 103
 104         while (1) {
 105                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 106                 entry_priv = entry->priv_data;
 107                 rt2x00_desc_read(entry_priv->desc, 0, &word);
 108
 109                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 110                         break;
 111
 112                 memset(&rxdesc, 0, sizeof(rxdesc));
 113                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 114
 115                 hdr = (struct ieee80211_hdr *)entry_priv->data;
 116                 header_size =
 117                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 118
 119                 /*
 120                  * The data behind the ieee80211 header must be
 121                  * aligned on a 4 byte boundary.
 122                  */
 123                 align = header_size % 4;
 124
 125                 /*
 126                  * Allocate the sk_buffer, initialize it and copy
 127                  * all data into it.
 128                  */
 129                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 130                 if (!entry->skb)
 131                         return;
 132
 133                 skb_reserve(entry->skb, align);
 134                 memcpy(skb_put(entry->skb, rxdesc.size),
 135                        entry_priv->data, rxdesc.size);
 136
 137                 /*
 138                  * Fill in skb descriptor
 139                  */
 140                 skbdesc = get_skb_frame_desc(entry->skb);
 141                 memset(skbdesc, 0, sizeof(*skbdesc));
 142                 skbdesc->data = entry->skb->data;
 143                 skbdesc->data_len = entry->skb->len;
 144                 skbdesc->desc = entry_priv->desc;
 145                 skbdesc->desc_len = queue->desc_size;
 146                 skbdesc->entry = entry;
 147
 148                 /*
 149                  * Send the frame to rt2x00lib for further processing.
 150                  */
 151                 rt2x00lib_rxdone(entry, &rxdesc);
 152
 153                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 154                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 155                         rt2x00_desc_write(entry_priv->desc, 0, word);
 156                 }
 157
 158                 rt2x00queue_index_inc(queue, Q_INDEX);
 159         }
 160 }
 161 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 162
 163 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 164                       struct txdone_entry_desc *txdesc)
 165 {
 166         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 167         u32 word;
 168
 169         txdesc->control = &entry_priv->control;
 170         rt2x00lib_txdone(entry, txdesc);
 171
 172         /*
 173          * Make this entry available for reuse.
 174          */
 175         entry->flags = 0;
 176
 177         rt2x00_desc_read(entry_priv->desc, 0, &word);
 178         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 179         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 180         rt2x00_desc_write(entry_priv->desc, 0, word);
 181
 182         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 183
 184         /*
 185          * If the data queue was full before the txdone handler
 186          * we must make sure the packet queue in the mac80211 stack
 187          * is reenabled when the txdone handler has finished.
 188          */
 189         if (!rt2x00queue_full(entry->queue))
 190                 ieee80211_wake_queue(rt2x00dev->hw, entry_priv->control.queue);
 191
 192 }
 193 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 194
 195 /*
 196  * Device initialization handlers.
 197  */
 198 #define desc_size(__queue)                      \
 199 ({                                              \
 200          ((__queue)->limit * (__queue)->desc_size);\
 201 })
 202
 203 #define data_size(__queue)                      \
 204 ({                                              \
 205          ((__queue)->limit * (__queue)->data_size);\
 206 })
 207
 208 #define dma_size(__queue)                       \
 209 ({                                              \
 210         data_size(__queue) + desc_size(__queue);\
 211 })
 212
 213 #define desc_offset(__queue, __base, __i)       \
 214 ({                                              \
 215         (__base) + data_size(__queue) +         \
 216             ((__i) * (__queue)->desc_size);     \
 217 })
 218
 219 #define data_offset(__queue, __base, __i)       \
 220 ({                                              \
 221         (__base) +                              \
 222             ((__i) * (__queue)->data_size);     \
 223 })
 224
 225 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 226                                      struct data_queue *queue)
 227 {
 228         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 229         struct queue_entry_priv_pci *entry_priv;
 230         void *addr;
 231         dma_addr_t dma;
 232         unsigned int i;
 233
 234         /*
 235          * Allocate DMA memory for descriptor and buffer.
 236          */
 237         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
 238         if (!addr)
 239                 return -ENOMEM;
 240
 241         memset(addr, 0, dma_size(queue));
 242
 243         /*
 244          * Initialize all queue entries to contain valid addresses.
 245          */
 246         for (i = 0; i < queue->limit; i++) {
 247                 entry_priv = queue->entries[i].priv_data;
 248                 entry_priv->desc = desc_offset(queue, addr, i);
 249                 entry_priv->desc_dma = desc_offset(queue, dma, i);
 250                 entry_priv->data = data_offset(queue, addr, i);
 251                 entry_priv->data_dma = data_offset(queue, dma, i);
 252         }
 253
 254         return 0;
 255 }
 256
 257 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 258                                      struct data_queue *queue)
 259 {
 260         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 261         struct queue_entry_priv_pci *entry_priv =
 262             queue->entries[0].priv_data;
 263
 264         if (entry_priv->data)
 265                 pci_free_consistent(pci_dev, dma_size(queue),
 266                                     entry_priv->data, entry_priv->data_dma);
 267         entry_priv->data = NULL;
 268 }
 269
 270 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 271 {
 272         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 273         struct data_queue *queue;
 274         int status;
 275
 276         /*
 277          * Allocate DMA
 278          */
 279         queue_for_each(rt2x00dev, queue) {
 280                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 281                 if (status)
 282                         goto exit;
 283         }
 284
 285         /*
 286          * Register interrupt handler.
 287          */
 288         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 289                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 290         if (status) {
 291                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 292                       pci_dev->irq, status);
 293                 goto exit;
 294         }
 295
 296         return 0;
 297
 298 exit:
 299         queue_for_each(rt2x00dev, queue)
 300                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 301
 302         return status;
 303 }
 304 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 305
 306 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 307 {
 308         struct data_queue *queue;
 309
 310         /*
 311          * Free irq line.
 312          */
 313         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 314
 315         /*
 316          * Free DMA
 317          */
 318         queue_for_each(rt2x00dev, queue)
 319                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 320 }
 321 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 322
 323 /*
 324  * PCI driver handlers.
 325  */
 326 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 327 {
 328         kfree(rt2x00dev->rf);
 329         rt2x00dev->rf = NULL;
 330
 331         kfree(rt2x00dev->eeprom);
 332         rt2x00dev->eeprom = NULL;
 333
 334         if (rt2x00dev->csr.base) {
 335                 iounmap(rt2x00dev->csr.base);
 336                 rt2x00dev->csr.base = NULL;
 337         }
 338 }
 339
 340 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 341 {
 342         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 343
 344         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 345                                       pci_resource_len(pci_dev, 0));
 346         if (!rt2x00dev->csr.base)
 347                 goto exit;
 348
 349         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 350         if (!rt2x00dev->eeprom)
 351                 goto exit;
 352
 353         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 354         if (!rt2x00dev->rf)
 355                 goto exit;
 356
 357         return 0;
 358
 359 exit:
 360         ERROR_PROBE("Failed to allocate registers.\n");
 361
 362         rt2x00pci_free_reg(rt2x00dev);
 363
 364         return -ENOMEM;
 365 }
 366
 367 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 368 {
 369         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 370         struct ieee80211_hw *hw;
 371         struct rt2x00_dev *rt2x00dev;
 372         int retval;
 373
 374         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 375         if (retval) {
 376                 ERROR_PROBE("PCI request regions failed.\n");
 377                 return retval;
 378         }
 379
 380         retval = pci_enable_device(pci_dev);
 381         if (retval) {
 382                 ERROR_PROBE("Enable device failed.\n");
 383                 goto exit_release_regions;
 384         }
 385
 386         pci_set_master(pci_dev);
 387
 388         if (pci_set_mwi(pci_dev))
 389                 ERROR_PROBE("MWI not available.\n");
 390
 391         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 392             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 393                 ERROR_PROBE("PCI DMA not supported.\n");
 394                 retval = -EIO;
 395                 goto exit_disable_device;
 396         }
 397
 398         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 399         if (!hw) {
 400                 ERROR_PROBE("Failed to allocate hardware.\n");
 401                 retval = -ENOMEM;
 402                 goto exit_disable_device;
 403         }
 404
 405         pci_set_drvdata(pci_dev, hw);
 406
 407         rt2x00dev = hw->priv;
 408         rt2x00dev->dev = pci_dev;
 409         rt2x00dev->ops = ops;
 410         rt2x00dev->hw = hw;
 411
 412         retval = rt2x00pci_alloc_reg(rt2x00dev);
 413         if (retval)
 414                 goto exit_free_device;
 415
 416         retval = rt2x00lib_probe_dev(rt2x00dev);
 417         if (retval)
 418                 goto exit_free_reg;
 419
 420         return 0;
 421
 422 exit_free_reg:
 423         rt2x00pci_free_reg(rt2x00dev);
 424
 425 exit_free_device:
 426         ieee80211_free_hw(hw);
 427
 428 exit_disable_device:
 429         if (retval != -EBUSY)
 430                 pci_disable_device(pci_dev);
 431
 432 exit_release_regions:
 433         pci_release_regions(pci_dev);
 434
 435         pci_set_drvdata(pci_dev, NULL);
 436
 437         return retval;
 438 }
 439 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 440
 441 void rt2x00pci_remove(struct pci_dev *pci_dev)
 442 {
 443         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 444         struct rt2x00_dev *rt2x00dev = hw->priv;
 445
 446         /*
 447          * Free all allocated data.
 448          */
 449         rt2x00lib_remove_dev(rt2x00dev);
 450         rt2x00pci_free_reg(rt2x00dev);
 451         ieee80211_free_hw(hw);
 452
 453         /*
 454          * Free the PCI device data.
 455          */
 456         pci_set_drvdata(pci_dev, NULL);
 457         pci_disable_device(pci_dev);
 458         pci_release_regions(pci_dev);
 459 }
 460 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 461
 462 #ifdef CONFIG_PM
 463 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 464 {
 465         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 466         struct rt2x00_dev *rt2x00dev = hw->priv;
 467         int retval;
 468
 469         retval = rt2x00lib_suspend(rt2x00dev, state);
 470         if (retval)
 471                 return retval;
 472
 473         rt2x00pci_free_reg(rt2x00dev);
 474
 475         pci_save_state(pci_dev);
 476         pci_disable_device(pci_dev);
 477         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 478 }
 479 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 480
 481 int rt2x00pci_resume(struct pci_dev *pci_dev)
 482 {
 483         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 484         struct rt2x00_dev *rt2x00dev = hw->priv;
 485         int retval;
 486
 487         if (pci_set_power_state(pci_dev, PCI_D0) ||
 488             pci_enable_device(pci_dev) ||
 489             pci_restore_state(pci_dev)) {
 490                 ERROR(rt2x00dev, "Failed to resume device.\n");
 491                 return -EIO;
 492         }
 493
 494         retval = rt2x00pci_alloc_reg(rt2x00dev);
 495         if (retval)
 496                 return retval;
 497
 498         retval = rt2x00lib_resume(rt2x00dev);
 499         if (retval)
 500                 goto exit_free_reg;
 501
 502         return 0;
 503
 504 exit_free_reg:
 505         rt2x00pci_free_reg(rt2x00dev);
 506
 507         return retval;
 508 }
 509 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 510 #endif /* CONFIG_PM */
 511
 512 /*
 513  * rt2x00pci module information.
 514  */
 515 MODULE_AUTHOR(DRV_PROJECT);
 516 MODULE_VERSION(DRV_VERSION);
 517 MODULE_DESCRIPTION("rt2x00 pci library");
 518 MODULE_LICENSE("GPL");