drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2007 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  * Beacon handlers.
  36  */
  37 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
  38                             struct ieee80211_tx_control *control)
  39 {
  40         struct rt2x00_dev *rt2x00dev = hw->priv;
  41         struct skb_desc *desc;
  42         struct data_ring *ring;
  43         struct data_entry *entry;
  44
  45         /*
  46          * Just in case mac80211 doesn't set this correctly,
  47          * but we need this queue set for the descriptor
  48          * initialization.
  49          */
  50         control->queue = IEEE80211_TX_QUEUE_BEACON;
  51         ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
  52         entry = rt2x00_get_data_entry(ring);
  53
  54         /*
  55          * Fill in skb descriptor
  56          */
  57         desc = get_skb_desc(skb);
  58         desc->desc_len = ring->desc_size;
  59         desc->data_len = skb->len;
  60         desc->desc = entry->priv;
  61         desc->data = skb->data;
  62         desc->ring = ring;
  63         desc->entry = entry;
  64
  65         memcpy(entry->data_addr, skb->data, skb->len);
  66         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
  67
  68         /*
  69          * Enable beacon generation.
  70          */
  71         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  72
  73         return 0;
  74 }
  75 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  76
  77 /*
  78  * TX data handlers.
  79  */
  80 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  81                             struct data_ring *ring, struct sk_buff *skb,
  82                             struct ieee80211_tx_control *control)
  83 {
  84         struct data_entry *entry = rt2x00_get_data_entry(ring);
  85         __le32 *txd = entry->priv;
  86         struct skb_desc *desc;
  87         u32 word;
  88
  89         if (rt2x00_ring_full(ring))
  90                 return -EINVAL;
  91
  92         rt2x00_desc_read(txd, 0, &word);
  93
  94         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  95             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  96                 ERROR(rt2x00dev,
  97                       "Arrived at non-free entry in the non-full queue %d.\n"
  98                       "Please file bug report to %s.\n",
  99                       control->queue, DRV_PROJECT);
 100                 return -EINVAL;
 101         }
 102
 103         /*
 104          * Fill in skb descriptor
 105          */
 106         desc = get_skb_desc(skb);
 107         desc->desc_len = ring->desc_size;
 108         desc->data_len = skb->len;
 109         desc->desc = entry->priv;
 110         desc->data = skb->data;
 111         desc->ring = ring;
 112         desc->entry = entry;
 113
 114         memcpy(entry->data_addr, skb->data, skb->len);
 115         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 116
 117         rt2x00_ring_index_inc(ring);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 122
 123 /*
 124  * TX/RX data handlers.
 125  */
 126 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 127 {
 128         struct data_ring *ring = rt2x00dev->rx;
 129         struct data_entry *entry;
 130         struct sk_buff *skb;
 131         struct ieee80211_hdr *hdr;
 132         struct skb_desc *skbdesc;
 133         struct rxdata_entry_desc desc;
 134         int header_size;
 135         __le32 *rxd;
 136         int align;
 137         u32 word;
 138
 139         while (1) {
 140                 entry = rt2x00_get_data_entry(ring);
 141                 rxd = entry->priv;
 142                 rt2x00_desc_read(rxd, 0, &word);
 143
 144                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 145                         break;
 146
 147                 memset(&desc, 0, sizeof(desc));
 148                 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 149
 150                 hdr = (struct ieee80211_hdr *)entry->data_addr;
 151                 header_size =
 152                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 153
 154                 /*
 155                  * The data behind the ieee80211 header must be
 156                  * aligned on a 4 byte boundary.
 157                  */
 158                 align = header_size % 4;
 159
 160                 /*
 161                  * Allocate the sk_buffer, initialize it and copy
 162                  * all data into it.
 163                  */
 164                 skb = dev_alloc_skb(desc.size + align);
 165                 if (!skb)
 166                         return;
 167
 168                 skb_reserve(skb, align);
 169                 memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size);
 170
 171                 /*
 172                  * Fill in skb descriptor
 173                  */
 174                 skbdesc = get_skb_desc(skb);
 175                 skbdesc->desc_len = entry->ring->desc_size;
 176                 skbdesc->data_len = skb->len;
 177                 skbdesc->desc = entry->priv;
 178                 skbdesc->data = skb->data;
 179                 skbdesc->ring = ring;
 180                 skbdesc->entry = entry;
 181
 182                 /*
 183                  * Send the frame to rt2x00lib for further processing.
 184                  */
 185                 rt2x00lib_rxdone(entry, skb, &desc);
 186
 187                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 188                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 189                         rt2x00_desc_write(rxd, 0, word);
 190                 }
 191
 192                 rt2x00_ring_index_inc(ring);
 193         }
 194 }
 195 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 196
 197 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct data_entry *entry,
 198                       const int tx_status, const int retry)
 199 {
 200         u32 word;
 201
 202         rt2x00lib_txdone(entry, tx_status, retry);
 203
 204         /*
 205          * Make this entry available for reuse.
 206          */
 207         entry->flags = 0;
 208
 209         rt2x00_desc_read(entry->priv, 0, &word);
 210         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 211         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 212         rt2x00_desc_write(entry->priv, 0, word);
 213
 214         rt2x00_ring_index_done_inc(entry->ring);
 215
 216         /*
 217          * If the data ring was full before the txdone handler
 218          * we must make sure the packet queue in the mac80211 stack
 219          * is reenabled when the txdone handler has finished.
 220          */
 221         if (!rt2x00_ring_full(entry->ring))
 222                 ieee80211_wake_queue(rt2x00dev->hw,
 223                                      entry->tx_status.control.queue);
 224
 225 }
 226 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 227
 228 /*
 229  * Device initialization handlers.
 230  */
 231 #define priv_offset(__ring, __i)                                \
 232 ({                                                              \
 233         ring->data_addr + (i * ring->desc_size);                \
 234 })
 235
 236 #define data_addr_offset(__ring, __i)                           \
 237 ({                                                              \
 238         (__ring)->data_addr +                                   \
 239             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 240             ((__i) * (__ring)->data_size);                      \
 241 })
 242
 243 #define data_dma_offset(__ring, __i)                            \
 244 ({                                                              \
 245         (__ring)->data_dma +                                    \
 246             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 247             ((__i) * (__ring)->data_size);                      \
 248 })
 249
 250 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 251                                struct data_ring *ring)
 252 {
 253         unsigned int i;
 254
 255         /*
 256          * Allocate DMA memory for descriptor and buffer.
 257          */
 258         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 259                                                rt2x00_get_ring_size(ring),
 260                                                &ring->data_dma);
 261         if (!ring->data_addr)
 262                 return -ENOMEM;
 263
 264         /*
 265          * Initialize all ring entries to contain valid
 266          * addresses.
 267          */
 268         for (i = 0; i < ring->stats.limit; i++) {
 269                 ring->entry[i].priv = priv_offset(ring, i);
 270                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 271                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 272         }
 273
 274         return 0;
 275 }
 276
 277 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 278                                struct data_ring *ring)
 279 {
 280         if (ring->data_addr)
 281                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 282                                     rt2x00_get_ring_size(ring),
 283                                     ring->data_addr, ring->data_dma);
 284         ring->data_addr = NULL;
 285 }
 286
 287 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 288 {
 289         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 290         struct data_ring *ring;
 291         int status;
 292
 293         /*
 294          * Allocate DMA
 295          */
 296         ring_for_each(rt2x00dev, ring) {
 297                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 298                 if (status)
 299                         goto exit;
 300         }
 301
 302         /*
 303          * Register interrupt handler.
 304          */
 305         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 306                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 307         if (status) {
 308                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 309                       pci_dev->irq, status);
 310                 return status;
 311         }
 312
 313         return 0;
 314
 315 exit:
 316         rt2x00pci_uninitialize(rt2x00dev);
 317
 318         return status;
 319 }
 320 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 321
 322 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 323 {
 324         struct data_ring *ring;
 325
 326         /*
 327          * Free irq line.
 328          */
 329         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 330
 331         /*
 332          * Free DMA
 333          */
 334         ring_for_each(rt2x00dev, ring)
 335                 rt2x00pci_free_dma(rt2x00dev, ring);
 336 }
 337 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 338
 339 /*
 340  * PCI driver handlers.
 341  */
 342 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 343 {
 344         kfree(rt2x00dev->rf);
 345         rt2x00dev->rf = NULL;
 346
 347         kfree(rt2x00dev->eeprom);
 348         rt2x00dev->eeprom = NULL;
 349
 350         if (rt2x00dev->csr_addr) {
 351                 iounmap(rt2x00dev->csr_addr);
 352                 rt2x00dev->csr_addr = NULL;
 353         }
 354 }
 355
 356 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 357 {
 358         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 359
 360         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 361                                       pci_resource_len(pci_dev, 0));
 362         if (!rt2x00dev->csr_addr)
 363                 goto exit;
 364
 365         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 366         if (!rt2x00dev->eeprom)
 367                 goto exit;
 368
 369         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 370         if (!rt2x00dev->rf)
 371                 goto exit;
 372
 373         return 0;
 374
 375 exit:
 376         ERROR_PROBE("Failed to allocate registers.\n");
 377
 378         rt2x00pci_free_reg(rt2x00dev);
 379
 380         return -ENOMEM;
 381 }
 382
 383 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 384 {
 385         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 386         struct ieee80211_hw *hw;
 387         struct rt2x00_dev *rt2x00dev;
 388         int retval;
 389
 390         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 391         if (retval) {
 392                 ERROR_PROBE("PCI request regions failed.\n");
 393                 return retval;
 394         }
 395
 396         retval = pci_enable_device(pci_dev);
 397         if (retval) {
 398                 ERROR_PROBE("Enable device failed.\n");
 399                 goto exit_release_regions;
 400         }
 401
 402         pci_set_master(pci_dev);
 403
 404         if (pci_set_mwi(pci_dev))
 405                 ERROR_PROBE("MWI not available.\n");
 406
 407         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 408             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 409                 ERROR_PROBE("PCI DMA not supported.\n");
 410                 retval = -EIO;
 411                 goto exit_disable_device;
 412         }
 413
 414         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 415         if (!hw) {
 416                 ERROR_PROBE("Failed to allocate hardware.\n");
 417                 retval = -ENOMEM;
 418                 goto exit_disable_device;
 419         }
 420
 421         pci_set_drvdata(pci_dev, hw);
 422
 423         rt2x00dev = hw->priv;
 424         rt2x00dev->dev = pci_dev;
 425         rt2x00dev->ops = ops;
 426         rt2x00dev->hw = hw;
 427
 428         retval = rt2x00pci_alloc_reg(rt2x00dev);
 429         if (retval)
 430                 goto exit_free_device;
 431
 432         retval = rt2x00lib_probe_dev(rt2x00dev);
 433         if (retval)
 434                 goto exit_free_reg;
 435
 436         return 0;
 437
 438 exit_free_reg:
 439         rt2x00pci_free_reg(rt2x00dev);
 440
 441 exit_free_device:
 442         ieee80211_free_hw(hw);
 443
 444 exit_disable_device:
 445         if (retval != -EBUSY)
 446                 pci_disable_device(pci_dev);
 447
 448 exit_release_regions:
 449         pci_release_regions(pci_dev);
 450
 451         pci_set_drvdata(pci_dev, NULL);
 452
 453         return retval;
 454 }
 455 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 456
 457 void rt2x00pci_remove(struct pci_dev *pci_dev)
 458 {
 459         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 460         struct rt2x00_dev *rt2x00dev = hw->priv;
 461
 462         /*
 463          * Free all allocated data.
 464          */
 465         rt2x00lib_remove_dev(rt2x00dev);
 466         rt2x00pci_free_reg(rt2x00dev);
 467         ieee80211_free_hw(hw);
 468
 469         /*
 470          * Free the PCI device data.
 471          */
 472         pci_set_drvdata(pci_dev, NULL);
 473         pci_disable_device(pci_dev);
 474         pci_release_regions(pci_dev);
 475 }
 476 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 477
 478 #ifdef CONFIG_PM
 479 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 480 {
 481         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 482         struct rt2x00_dev *rt2x00dev = hw->priv;
 483         int retval;
 484
 485         retval = rt2x00lib_suspend(rt2x00dev, state);
 486         if (retval)
 487                 return retval;
 488
 489         rt2x00pci_free_reg(rt2x00dev);
 490
 491         pci_save_state(pci_dev);
 492         pci_disable_device(pci_dev);
 493         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 494 }
 495 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 496
 497 int rt2x00pci_resume(struct pci_dev *pci_dev)
 498 {
 499         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 500         struct rt2x00_dev *rt2x00dev = hw->priv;
 501         int retval;
 502
 503         if (pci_set_power_state(pci_dev, PCI_D0) ||
 504             pci_enable_device(pci_dev) ||
 505             pci_restore_state(pci_dev)) {
 506                 ERROR(rt2x00dev, "Failed to resume device.\n");
 507                 return -EIO;
 508         }
 509
 510         retval = rt2x00pci_alloc_reg(rt2x00dev);
 511         if (retval)
 512                 return retval;
 513
 514         retval = rt2x00lib_resume(rt2x00dev);
 515         if (retval)
 516                 goto exit_free_reg;
 517
 518         return 0;
 519
 520 exit_free_reg:
 521         rt2x00pci_free_reg(rt2x00dev);
 522
 523         return retval;
 524 }
 525 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 526 #endif /* CONFIG_PM */
 527
 528 /*
 529  * rt2x00pci module information.
 530  */
 531 MODULE_AUTHOR(DRV_PROJECT);
 532 MODULE_VERSION(DRV_VERSION);
 533 MODULE_DESCRIPTION("rt2x00 library");
 534 MODULE_LICENSE("GPL");