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_tx *priv_tx = entry->priv_data;
  43         struct skb_frame_desc *skbdesc;
  44         u32 word;
  45
  46         if (rt2x00queue_full(queue))
  47                 return -EINVAL;
  48
  49         rt2x00_desc_read(priv_tx->desc, 0, &word);
  50
  51         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  52             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  53                 ERROR(rt2x00dev,
  54                       "Arrived at non-free entry in the non-full queue %d.\n"
  55                       "Please file bug report to %s.\n",
  56                       control->queue, DRV_PROJECT);
  57                 return -EINVAL;
  58         }
  59
  60         /*
  61          * Fill in skb descriptor
  62          */
  63         skbdesc = get_skb_frame_desc(skb);
  64         skbdesc->data = skb->data;
  65         skbdesc->data_len = skb->len;
  66         skbdesc->desc = priv_tx->desc;
  67         skbdesc->desc_len = queue->desc_size;
  68         skbdesc->entry = entry;
  69
  70         memcpy(priv_tx->data, skb->data, skb->len);
  71         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
  72
  73         rt2x00queue_index_inc(queue, Q_INDEX);
  74
  75         return 0;
  76 }
  77 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  78
  79 /*
  80  * TX/RX data handlers.
  81  */
  82 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  83 {
  84         struct data_queue *queue = rt2x00dev->rx;
  85         struct queue_entry *entry;
  86         struct queue_entry_priv_pci_rx *priv_rx;
  87         struct ieee80211_hdr *hdr;
  88         struct skb_frame_desc *skbdesc;
  89         struct rxdone_entry_desc rxdesc;
  90         int header_size;
  91         int align;
  92         u32 word;
  93
  94         while (1) {
  95                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  96                 priv_rx = entry->priv_data;
  97                 rt2x00_desc_read(priv_rx->desc, 0, &word);
  98
  99                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 100                         break;
 101
 102                 memset(&rxdesc, 0, sizeof(rxdesc));
 103                 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
 104
 105                 hdr = (struct ieee80211_hdr *)priv_rx->data;
 106                 header_size =
 107                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 108
 109                 /*
 110                  * The data behind the ieee80211 header must be
 111                  * aligned on a 4 byte boundary.
 112                  */
 113                 align = header_size % 4;
 114
 115                 /*
 116                  * Allocate the sk_buffer, initialize it and copy
 117                  * all data into it.
 118                  */
 119                 entry->skb = dev_alloc_skb(rxdesc.size + align);
 120                 if (!entry->skb)
 121                         return;
 122
 123                 skb_reserve(entry->skb, align);
 124                 memcpy(skb_put(entry->skb, rxdesc.size),
 125                        priv_rx->data, rxdesc.size);
 126
 127                 /*
 128                  * Fill in skb descriptor
 129                  */
 130                 skbdesc = get_skb_frame_desc(entry->skb);
 131                 memset(skbdesc, 0, sizeof(*skbdesc));
 132                 skbdesc->data = entry->skb->data;
 133                 skbdesc->data_len = entry->skb->len;
 134                 skbdesc->desc = priv_rx->desc;
 135                 skbdesc->desc_len = queue->desc_size;
 136                 skbdesc->entry = entry;
 137
 138                 /*
 139                  * Send the frame to rt2x00lib for further processing.
 140                  */
 141                 rt2x00lib_rxdone(entry, &rxdesc);
 142
 143                 if (test_bit(DEVICE_ENABLED_RADIO, &queue->rt2x00dev->flags)) {
 144                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 145                         rt2x00_desc_write(priv_rx->desc, 0, word);
 146                 }
 147
 148                 rt2x00queue_index_inc(queue, Q_INDEX);
 149         }
 150 }
 151 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 152
 153 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
 154                       struct txdone_entry_desc *txdesc)
 155 {
 156         struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
 157         u32 word;
 158
 159         txdesc->control = &priv_tx->control;
 160         rt2x00lib_txdone(entry, txdesc);
 161
 162         /*
 163          * Make this entry available for reuse.
 164          */
 165         entry->flags = 0;
 166
 167         rt2x00_desc_read(priv_tx->desc, 0, &word);
 168         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 169         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 170         rt2x00_desc_write(priv_tx->desc, 0, word);
 171
 172         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
 173
 174         /*
 175          * If the data queue was full before the txdone handler
 176          * we must make sure the packet queue in the mac80211 stack
 177          * is reenabled when the txdone handler has finished.
 178          */
 179         if (!rt2x00queue_full(entry->queue))
 180                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
 181
 182 }
 183 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 184
 185 /*
 186  * Device initialization handlers.
 187  */
 188 #define desc_size(__queue)                      \
 189 ({                                              \
 190          ((__queue)->limit * (__queue)->desc_size);\
 191 })
 192
 193 #define data_size(__queue)                      \
 194 ({                                              \
 195          ((__queue)->limit * (__queue)->data_size);\
 196 })
 197
 198 #define dma_size(__queue)                       \
 199 ({                                              \
 200         data_size(__queue) + desc_size(__queue);\
 201 })
 202
 203 #define desc_offset(__queue, __base, __i)       \
 204 ({                                              \
 205         (__base) + data_size(__queue) +         \
 206             ((__i) * (__queue)->desc_size);     \
 207 })
 208
 209 #define data_offset(__queue, __base, __i)       \
 210 ({                                              \
 211         (__base) +                              \
 212             ((__i) * (__queue)->data_size);     \
 213 })
 214
 215 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 216                                      struct data_queue *queue)
 217 {
 218         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 219         struct queue_entry_priv_pci_rx *priv_rx;
 220         struct queue_entry_priv_pci_tx *priv_tx;
 221         void *addr;
 222         dma_addr_t dma;
 223         void *desc_addr;
 224         dma_addr_t desc_dma;
 225         void *data_addr;
 226         dma_addr_t data_dma;
 227         unsigned int i;
 228
 229         /*
 230          * Allocate DMA memory for descriptor and buffer.
 231          */
 232         addr = pci_alloc_consistent(pci_dev, dma_size(queue), &dma);
 233         if (!addr)
 234                 return -ENOMEM;
 235
 236         memset(addr, 0, dma_size(queue));
 237
 238         /*
 239          * Initialize all queue entries to contain valid addresses.
 240          */
 241         for (i = 0; i < queue->limit; i++) {
 242                 desc_addr = desc_offset(queue, addr, i);
 243                 desc_dma = desc_offset(queue, dma, i);
 244                 data_addr = data_offset(queue, addr, i);
 245                 data_dma = data_offset(queue, dma, i);
 246
 247                 if (queue->qid == QID_RX) {
 248                         priv_rx = queue->entries[i].priv_data;
 249                         priv_rx->desc = desc_addr;
 250                         priv_rx->desc_dma = desc_dma;
 251                         priv_rx->data = data_addr;
 252                         priv_rx->data_dma = data_dma;
 253                 } else {
 254                         priv_tx = queue->entries[i].priv_data;
 255                         priv_tx->desc = desc_addr;
 256                         priv_tx->desc_dma = desc_dma;
 257                         priv_tx->data = data_addr;
 258                         priv_tx->data_dma = data_dma;
 259                 }
 260         }
 261
 262         return 0;
 263 }
 264
 265 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 266                                      struct data_queue *queue)
 267 {
 268         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 269         struct queue_entry_priv_pci_rx *priv_rx;
 270         struct queue_entry_priv_pci_tx *priv_tx;
 271         void *data_addr;
 272         dma_addr_t data_dma;
 273
 274         if (queue->qid == QID_RX) {
 275                 priv_rx = queue->entries[0].priv_data;
 276                 data_addr = priv_rx->data;
 277                 data_dma = priv_rx->data_dma;
 278
 279                 priv_rx->data = NULL;
 280         } else {
 281                 priv_tx = queue->entries[0].priv_data;
 282                 data_addr = priv_tx->data;
 283                 data_dma = priv_tx->data_dma;
 284
 285                 priv_tx->data = NULL;
 286         }
 287
 288         if (data_addr)
 289                 pci_free_consistent(pci_dev, dma_size(queue),
 290                                     data_addr, data_dma);
 291 }
 292
 293 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 294 {
 295         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 296         struct data_queue *queue;
 297         int status;
 298
 299         /*
 300          * Allocate DMA
 301          */
 302         queue_for_each(rt2x00dev, queue) {
 303                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 304                 if (status)
 305                         goto exit;
 306         }
 307
 308         /*
 309          * Register interrupt handler.
 310          */
 311         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 312                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 313         if (status) {
 314                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 315                       pci_dev->irq, status);
 316                 return status;
 317         }
 318
 319         return 0;
 320
 321 exit:
 322         rt2x00pci_uninitialize(rt2x00dev);
 323
 324         return status;
 325 }
 326 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 327
 328 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 329 {
 330         struct data_queue *queue;
 331
 332         /*
 333          * Free irq line.
 334          */
 335         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 336
 337         /*
 338          * Free DMA
 339          */
 340         queue_for_each(rt2x00dev, queue)
 341                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 342 }
 343 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 344
 345 /*
 346  * PCI driver handlers.
 347  */
 348 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 349 {
 350         kfree(rt2x00dev->rf);
 351         rt2x00dev->rf = NULL;
 352
 353         kfree(rt2x00dev->eeprom);
 354         rt2x00dev->eeprom = NULL;
 355
 356         if (rt2x00dev->csr.base) {
 357                 iounmap(rt2x00dev->csr.base);
 358                 rt2x00dev->csr.base = NULL;
 359         }
 360 }
 361
 362 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 363 {
 364         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 365
 366         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 367                                       pci_resource_len(pci_dev, 0));
 368         if (!rt2x00dev->csr.base)
 369                 goto exit;
 370
 371         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 372         if (!rt2x00dev->eeprom)
 373                 goto exit;
 374
 375         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 376         if (!rt2x00dev->rf)
 377                 goto exit;
 378
 379         return 0;
 380
 381 exit:
 382         ERROR_PROBE("Failed to allocate registers.\n");
 383
 384         rt2x00pci_free_reg(rt2x00dev);
 385
 386         return -ENOMEM;
 387 }
 388
 389 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 390 {
 391         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 392         struct ieee80211_hw *hw;
 393         struct rt2x00_dev *rt2x00dev;
 394         int retval;
 395
 396         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 397         if (retval) {
 398                 ERROR_PROBE("PCI request regions failed.\n");
 399                 return retval;
 400         }
 401
 402         retval = pci_enable_device(pci_dev);
 403         if (retval) {
 404                 ERROR_PROBE("Enable device failed.\n");
 405                 goto exit_release_regions;
 406         }
 407
 408         pci_set_master(pci_dev);
 409
 410         if (pci_set_mwi(pci_dev))
 411                 ERROR_PROBE("MWI not available.\n");
 412
 413         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 414             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 415                 ERROR_PROBE("PCI DMA not supported.\n");
 416                 retval = -EIO;
 417                 goto exit_disable_device;
 418         }
 419
 420         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 421         if (!hw) {
 422                 ERROR_PROBE("Failed to allocate hardware.\n");
 423                 retval = -ENOMEM;
 424                 goto exit_disable_device;
 425         }
 426
 427         pci_set_drvdata(pci_dev, hw);
 428
 429         rt2x00dev = hw->priv;
 430         rt2x00dev->dev = pci_dev;
 431         rt2x00dev->ops = ops;
 432         rt2x00dev->hw = hw;
 433
 434         retval = rt2x00pci_alloc_reg(rt2x00dev);
 435         if (retval)
 436                 goto exit_free_device;
 437
 438         retval = rt2x00lib_probe_dev(rt2x00dev);
 439         if (retval)
 440                 goto exit_free_reg;
 441
 442         return 0;
 443
 444 exit_free_reg:
 445         rt2x00pci_free_reg(rt2x00dev);
 446
 447 exit_free_device:
 448         ieee80211_free_hw(hw);
 449
 450 exit_disable_device:
 451         if (retval != -EBUSY)
 452                 pci_disable_device(pci_dev);
 453
 454 exit_release_regions:
 455         pci_release_regions(pci_dev);
 456
 457         pci_set_drvdata(pci_dev, NULL);
 458
 459         return retval;
 460 }
 461 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 462
 463 void rt2x00pci_remove(struct pci_dev *pci_dev)
 464 {
 465         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 466         struct rt2x00_dev *rt2x00dev = hw->priv;
 467
 468         /*
 469          * Free all allocated data.
 470          */
 471         rt2x00lib_remove_dev(rt2x00dev);
 472         rt2x00pci_free_reg(rt2x00dev);
 473         ieee80211_free_hw(hw);
 474
 475         /*
 476          * Free the PCI device data.
 477          */
 478         pci_set_drvdata(pci_dev, NULL);
 479         pci_disable_device(pci_dev);
 480         pci_release_regions(pci_dev);
 481 }
 482 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 483
 484 #ifdef CONFIG_PM
 485 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 486 {
 487         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 488         struct rt2x00_dev *rt2x00dev = hw->priv;
 489         int retval;
 490
 491         retval = rt2x00lib_suspend(rt2x00dev, state);
 492         if (retval)
 493                 return retval;
 494
 495         rt2x00pci_free_reg(rt2x00dev);
 496
 497         pci_save_state(pci_dev);
 498         pci_disable_device(pci_dev);
 499         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 500 }
 501 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 502
 503 int rt2x00pci_resume(struct pci_dev *pci_dev)
 504 {
 505         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 506         struct rt2x00_dev *rt2x00dev = hw->priv;
 507         int retval;
 508
 509         if (pci_set_power_state(pci_dev, PCI_D0) ||
 510             pci_enable_device(pci_dev) ||
 511             pci_restore_state(pci_dev)) {
 512                 ERROR(rt2x00dev, "Failed to resume device.\n");
 513                 return -EIO;
 514         }
 515
 516         retval = rt2x00pci_alloc_reg(rt2x00dev);
 517         if (retval)
 518                 return retval;
 519
 520         retval = rt2x00lib_resume(rt2x00dev);
 521         if (retval)
 522                 goto exit_free_reg;
 523
 524         return 0;
 525
 526 exit_free_reg:
 527         rt2x00pci_free_reg(rt2x00dev);
 528
 529         return retval;
 530 }
 531 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 532 #endif /* CONFIG_PM */
 533
 534 /*
 535  * rt2x00pci module information.
 536  */
 537 MODULE_AUTHOR(DRV_PROJECT);
 538 MODULE_VERSION(DRV_VERSION);
 539 MODULE_DESCRIPTION("rt2x00 pci library");
 540 MODULE_LICENSE("GPL");