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 data_ring *ring =
  42             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
  43         struct data_entry *entry = rt2x00_get_data_entry(ring);
  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
  52         /*
  53          * Update the beacon entry.
  54          */
  55         memcpy(entry->data_addr, skb->data, skb->len);
  56         rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
  57                                 (struct ieee80211_hdr *)skb->data,
  58                                 skb->len, control);
  59
  60         /*
  61          * Enable beacon generation.
  62          */
  63         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  64
  65         return 0;
  66 }
  67 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  68
  69 /*
  70  * TX data handlers.
  71  */
  72 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  73                             struct data_ring *ring, struct sk_buff *skb,
  74                             struct ieee80211_tx_control *control)
  75 {
  76         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
  77         struct data_entry *entry = rt2x00_get_data_entry(ring);
  78         __le32 *txd = entry->priv;
  79         u32 word;
  80
  81         if (rt2x00_ring_full(ring)) {
  82                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
  83                 return -EINVAL;
  84         }
  85
  86         rt2x00_desc_read(txd, 0, &word);
  87
  88         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  89             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  90                 ERROR(rt2x00dev,
  91                       "Arrived at non-free entry in the non-full queue %d.\n"
  92                       "Please file bug report to %s.\n",
  93                       control->queue, DRV_PROJECT);
  94                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
  95                 return -EINVAL;
  96         }
  97
  98         entry->skb = skb;
  99         memcpy(&entry->tx_status.control, control, sizeof(*control));
 100         memcpy(entry->data_addr, skb->data, skb->len);
 101         rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
 102                                 skb->len, control);
 103
 104         rt2x00_ring_index_inc(ring);
 105
 106         if (rt2x00_ring_full(ring))
 107                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 108
 109         return 0;
 110 }
 111 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 112
 113 /*
 114  * TX/RX data handlers.
 115  */
 116 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 117 {
 118         struct data_ring *ring = rt2x00dev->rx;
 119         struct data_entry *entry;
 120         struct sk_buff *skb;
 121         struct ieee80211_hdr *hdr;
 122         struct rxdata_entry_desc desc;
 123         int header_size;
 124         __le32 *rxd;
 125         int align;
 126         u32 word;
 127
 128         while (1) {
 129                 entry = rt2x00_get_data_entry(ring);
 130                 rxd = entry->priv;
 131                 rt2x00_desc_read(rxd, 0, &word);
 132
 133                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 134                         break;
 135
 136                 memset(&desc, 0x00, sizeof(desc));
 137                 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 138
 139                 hdr = (struct ieee80211_hdr *)entry->data_addr;
 140                 header_size =
 141                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 142
 143                 /*
 144                  * The data behind the ieee80211 header must be
 145                  * aligned on a 4 byte boundary.
 146                  */
 147                 align = header_size % 4;
 148
 149                 /*
 150                  * Allocate the sk_buffer, initialize it and copy
 151                  * all data into it.
 152                  */
 153                 skb = dev_alloc_skb(desc.size + align);
 154                 if (!skb)
 155                         return;
 156
 157                 skb_reserve(skb, align);
 158                 memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size);
 159
 160                 /*
 161                  * Send the frame to rt2x00lib for further processing.
 162                  */
 163                 rt2x00lib_rxdone(entry, skb, &desc);
 164
 165                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 166                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 167                         rt2x00_desc_write(rxd, 0, word);
 168                 }
 169
 170                 rt2x00_ring_index_inc(ring);
 171         }
 172 }
 173 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 174
 175 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct data_entry *entry,
 176                       const int tx_status, const int retry)
 177 {
 178         u32 word;
 179
 180         rt2x00lib_txdone(entry, tx_status, retry);
 181
 182         /*
 183          * Make this entry available for reuse.
 184          */
 185         entry->flags = 0;
 186
 187         rt2x00_desc_read(entry->priv, 0, &word);
 188         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 189         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 190         rt2x00_desc_write(entry->priv, 0, word);
 191
 192         rt2x00_ring_index_done_inc(entry->ring);
 193
 194         /*
 195          * If the data ring was full before the txdone handler
 196          * we must make sure the packet queue in the mac80211 stack
 197          * is reenabled when the txdone handler has finished.
 198          */
 199         if (!rt2x00_ring_full(entry->ring))
 200                 ieee80211_wake_queue(rt2x00dev->hw,
 201                                      entry->tx_status.control.queue);
 202
 203 }
 204 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 205
 206 /*
 207  * Device initialization handlers.
 208  */
 209 #define priv_offset(__ring, __i)                                \
 210 ({                                                              \
 211         ring->data_addr + (i * ring->desc_size);                \
 212 })
 213
 214 #define data_addr_offset(__ring, __i)                           \
 215 ({                                                              \
 216         (__ring)->data_addr +                                   \
 217             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 218             ((__i) * (__ring)->data_size);                      \
 219 })
 220
 221 #define data_dma_offset(__ring, __i)                            \
 222 ({                                                              \
 223         (__ring)->data_dma +                                    \
 224             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 225             ((__i) * (__ring)->data_size);                      \
 226 })
 227
 228 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 229                                struct data_ring *ring)
 230 {
 231         unsigned int i;
 232
 233         /*
 234          * Allocate DMA memory for descriptor and buffer.
 235          */
 236         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 237                                                rt2x00_get_ring_size(ring),
 238                                                &ring->data_dma);
 239         if (!ring->data_addr)
 240                 return -ENOMEM;
 241
 242         /*
 243          * Initialize all ring entries to contain valid
 244          * addresses.
 245          */
 246         for (i = 0; i < ring->stats.limit; i++) {
 247                 ring->entry[i].priv = priv_offset(ring, i);
 248                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 249                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 250         }
 251
 252         return 0;
 253 }
 254
 255 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 256                                struct data_ring *ring)
 257 {
 258         if (ring->data_addr)
 259                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 260                                     rt2x00_get_ring_size(ring),
 261                                     ring->data_addr, ring->data_dma);
 262         ring->data_addr = NULL;
 263 }
 264
 265 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 266 {
 267         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 268         struct data_ring *ring;
 269         int status;
 270
 271         /*
 272          * Allocate DMA
 273          */
 274         ring_for_each(rt2x00dev, ring) {
 275                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 276                 if (status)
 277                         goto exit;
 278         }
 279
 280         /*
 281          * Register interrupt handler.
 282          */
 283         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 284                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 285         if (status) {
 286                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 287                       pci_dev->irq, status);
 288                 return status;
 289         }
 290
 291         return 0;
 292
 293 exit:
 294         rt2x00pci_uninitialize(rt2x00dev);
 295
 296         return status;
 297 }
 298 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 299
 300 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 301 {
 302         struct data_ring *ring;
 303
 304         /*
 305          * Free irq line.
 306          */
 307         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 308
 309         /*
 310          * Free DMA
 311          */
 312         ring_for_each(rt2x00dev, ring)
 313                 rt2x00pci_free_dma(rt2x00dev, ring);
 314 }
 315 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 316
 317 /*
 318  * PCI driver handlers.
 319  */
 320 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 321 {
 322         kfree(rt2x00dev->rf);
 323         rt2x00dev->rf = NULL;
 324
 325         kfree(rt2x00dev->eeprom);
 326         rt2x00dev->eeprom = NULL;
 327
 328         if (rt2x00dev->csr_addr) {
 329                 iounmap(rt2x00dev->csr_addr);
 330                 rt2x00dev->csr_addr = NULL;
 331         }
 332 }
 333
 334 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 335 {
 336         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 337
 338         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 339                                       pci_resource_len(pci_dev, 0));
 340         if (!rt2x00dev->csr_addr)
 341                 goto exit;
 342
 343         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 344         if (!rt2x00dev->eeprom)
 345                 goto exit;
 346
 347         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 348         if (!rt2x00dev->rf)
 349                 goto exit;
 350
 351         return 0;
 352
 353 exit:
 354         ERROR_PROBE("Failed to allocate registers.\n");
 355
 356         rt2x00pci_free_reg(rt2x00dev);
 357
 358         return -ENOMEM;
 359 }
 360
 361 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 362 {
 363         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 364         struct ieee80211_hw *hw;
 365         struct rt2x00_dev *rt2x00dev;
 366         int retval;
 367
 368         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 369         if (retval) {
 370                 ERROR_PROBE("PCI request regions failed.\n");
 371                 return retval;
 372         }
 373
 374         retval = pci_enable_device(pci_dev);
 375         if (retval) {
 376                 ERROR_PROBE("Enable device failed.\n");
 377                 goto exit_release_regions;
 378         }
 379
 380         pci_set_master(pci_dev);
 381
 382         if (pci_set_mwi(pci_dev))
 383                 ERROR_PROBE("MWI not available.\n");
 384
 385         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 386             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 387                 ERROR_PROBE("PCI DMA not supported.\n");
 388                 retval = -EIO;
 389                 goto exit_disable_device;
 390         }
 391
 392         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 393         if (!hw) {
 394                 ERROR_PROBE("Failed to allocate hardware.\n");
 395                 retval = -ENOMEM;
 396                 goto exit_disable_device;
 397         }
 398
 399         pci_set_drvdata(pci_dev, hw);
 400
 401         rt2x00dev = hw->priv;
 402         rt2x00dev->dev = pci_dev;
 403         rt2x00dev->ops = ops;
 404         rt2x00dev->hw = hw;
 405
 406         retval = rt2x00pci_alloc_reg(rt2x00dev);
 407         if (retval)
 408                 goto exit_free_device;
 409
 410         retval = rt2x00lib_probe_dev(rt2x00dev);
 411         if (retval)
 412                 goto exit_free_reg;
 413
 414         return 0;
 415
 416 exit_free_reg:
 417         rt2x00pci_free_reg(rt2x00dev);
 418
 419 exit_free_device:
 420         ieee80211_free_hw(hw);
 421
 422 exit_disable_device:
 423         if (retval != -EBUSY)
 424                 pci_disable_device(pci_dev);
 425
 426 exit_release_regions:
 427         pci_release_regions(pci_dev);
 428
 429         pci_set_drvdata(pci_dev, NULL);
 430
 431         return retval;
 432 }
 433 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 434
 435 void rt2x00pci_remove(struct pci_dev *pci_dev)
 436 {
 437         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 438         struct rt2x00_dev *rt2x00dev = hw->priv;
 439
 440         /*
 441          * Free all allocated data.
 442          */
 443         rt2x00lib_remove_dev(rt2x00dev);
 444         rt2x00pci_free_reg(rt2x00dev);
 445         ieee80211_free_hw(hw);
 446
 447         /*
 448          * Free the PCI device data.
 449          */
 450         pci_set_drvdata(pci_dev, NULL);
 451         pci_disable_device(pci_dev);
 452         pci_release_regions(pci_dev);
 453 }
 454 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 455
 456 #ifdef CONFIG_PM
 457 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 458 {
 459         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 460         struct rt2x00_dev *rt2x00dev = hw->priv;
 461         int retval;
 462
 463         retval = rt2x00lib_suspend(rt2x00dev, state);
 464         if (retval)
 465                 return retval;
 466
 467         rt2x00pci_free_reg(rt2x00dev);
 468
 469         pci_save_state(pci_dev);
 470         pci_disable_device(pci_dev);
 471         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 472 }
 473 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 474
 475 int rt2x00pci_resume(struct pci_dev *pci_dev)
 476 {
 477         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 478         struct rt2x00_dev *rt2x00dev = hw->priv;
 479         int retval;
 480
 481         if (pci_set_power_state(pci_dev, PCI_D0) ||
 482             pci_enable_device(pci_dev) ||
 483             pci_restore_state(pci_dev)) {
 484                 ERROR(rt2x00dev, "Failed to resume device.\n");
 485                 return -EIO;
 486         }
 487
 488         retval = rt2x00pci_alloc_reg(rt2x00dev);
 489         if (retval)
 490                 return retval;
 491
 492         retval = rt2x00lib_resume(rt2x00dev);
 493         if (retval)
 494                 goto exit_free_reg;
 495
 496         return 0;
 497
 498 exit_free_reg:
 499         rt2x00pci_free_reg(rt2x00dev);
 500
 501         return retval;
 502 }
 503 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 504 #endif /* CONFIG_PM */
 505
 506 /*
 507  * rt2x00pci module information.
 508  */
 509 MODULE_AUTHOR(DRV_PROJECT);
 510 MODULE_VERSION(DRV_VERSION);
 511 MODULE_DESCRIPTION("rt2x00 library");
 512 MODULE_LICENSE("GPL");