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