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