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   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                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
  91                 return -EINVAL;
  92         }
  93
  94         rt2x00_desc_read(txd, 0, &word);
  95
  96         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  97             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  98                 ERROR(rt2x00dev,
  99                       "Arrived at non-free entry in the non-full queue %d.\n"
 100                       "Please file bug report to %s.\n",
 101                       control->queue, DRV_PROJECT);
 102                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 103                 return -EINVAL;
 104         }
 105
 106         /*
 107          * Fill in skb descriptor
 108          */
 109         desc = get_skb_desc(skb);
 110         desc->desc_len = ring->desc_size;
 111         desc->data_len = skb->len;
 112         desc->desc = entry->priv;
 113         desc->data = skb->data;
 114         desc->ring = ring;
 115         desc->entry = entry;
 116
 117         memcpy(entry->data_addr, skb->data, skb->len);
 118         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 119
 120         rt2x00_ring_index_inc(ring);
 121
 122         if (rt2x00_ring_full(ring))
 123                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 124
 125         return 0;
 126 }
 127 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 128
 129 /*
 130  * TX/RX data handlers.
 131  */
 132 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 133 {
 134         struct data_ring *ring = rt2x00dev->rx;
 135         struct data_entry *entry;
 136         struct sk_buff *skb;
 137         struct ieee80211_hdr *hdr;
 138         struct skb_desc *skbdesc;
 139         struct rxdata_entry_desc desc;
 140         int header_size;
 141         __le32 *rxd;
 142         int align;
 143         u32 word;
 144
 145         while (1) {
 146                 entry = rt2x00_get_data_entry(ring);
 147                 rxd = entry->priv;
 148                 rt2x00_desc_read(rxd, 0, &word);
 149
 150                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 151                         break;
 152
 153                 memset(&desc, 0, sizeof(desc));
 154                 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 155
 156                 hdr = (struct ieee80211_hdr *)entry->data_addr;
 157                 header_size =
 158                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 159
 160                 /*
 161                  * The data behind the ieee80211 header must be
 162                  * aligned on a 4 byte boundary.
 163                  */
 164                 align = header_size % 4;
 165
 166                 /*
 167                  * Allocate the sk_buffer, initialize it and copy
 168                  * all data into it.
 169                  */
 170                 skb = dev_alloc_skb(desc.size + align);
 171                 if (!skb)
 172                         return;
 173
 174                 skb_reserve(skb, align);
 175                 memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size);
 176
 177                 /*
 178                  * Fill in skb descriptor
 179                  */
 180                 skbdesc = get_skb_desc(skb);
 181                 skbdesc->desc_len = entry->ring->desc_size;
 182                 skbdesc->data_len = skb->len;
 183                 skbdesc->desc = entry->priv;
 184                 skbdesc->data = skb->data;
 185                 skbdesc->ring = ring;
 186                 skbdesc->entry = entry;
 187
 188                 /*
 189                  * Send the frame to rt2x00lib for further processing.
 190                  */
 191                 rt2x00lib_rxdone(entry, skb, &desc);
 192
 193                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 194                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 195                         rt2x00_desc_write(rxd, 0, word);
 196                 }
 197
 198                 rt2x00_ring_index_inc(ring);
 199         }
 200 }
 201 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 202
 203 void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct data_entry *entry,
 204                       const int tx_status, const int retry)
 205 {
 206         u32 word;
 207
 208         rt2x00lib_txdone(entry, tx_status, retry);
 209
 210         /*
 211          * Make this entry available for reuse.
 212          */
 213         entry->flags = 0;
 214
 215         rt2x00_desc_read(entry->priv, 0, &word);
 216         rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
 217         rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
 218         rt2x00_desc_write(entry->priv, 0, word);
 219
 220         rt2x00_ring_index_done_inc(entry->ring);
 221
 222         /*
 223          * If the data ring was full before the txdone handler
 224          * we must make sure the packet queue in the mac80211 stack
 225          * is reenabled when the txdone handler has finished.
 226          */
 227         if (!rt2x00_ring_full(entry->ring))
 228                 ieee80211_wake_queue(rt2x00dev->hw,
 229                                      entry->tx_status.control.queue);
 230
 231 }
 232 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 233
 234 /*
 235  * Device initialization handlers.
 236  */
 237 #define priv_offset(__ring, __i)                                \
 238 ({                                                              \
 239         ring->data_addr + (i * ring->desc_size);                \
 240 })
 241
 242 #define data_addr_offset(__ring, __i)                           \
 243 ({                                                              \
 244         (__ring)->data_addr +                                   \
 245             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 246             ((__i) * (__ring)->data_size);                      \
 247 })
 248
 249 #define data_dma_offset(__ring, __i)                            \
 250 ({                                                              \
 251         (__ring)->data_dma +                                    \
 252             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 253             ((__i) * (__ring)->data_size);                      \
 254 })
 255
 256 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 257                                struct data_ring *ring)
 258 {
 259         unsigned int i;
 260
 261         /*
 262          * Allocate DMA memory for descriptor and buffer.
 263          */
 264         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 265                                                rt2x00_get_ring_size(ring),
 266                                                &ring->data_dma);
 267         if (!ring->data_addr)
 268                 return -ENOMEM;
 269
 270         /*
 271          * Initialize all ring entries to contain valid
 272          * addresses.
 273          */
 274         for (i = 0; i < ring->stats.limit; i++) {
 275                 ring->entry[i].priv = priv_offset(ring, i);
 276                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 277                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 278         }
 279
 280         return 0;
 281 }
 282
 283 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 284                                struct data_ring *ring)
 285 {
 286         if (ring->data_addr)
 287                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 288                                     rt2x00_get_ring_size(ring),
 289                                     ring->data_addr, ring->data_dma);
 290         ring->data_addr = NULL;
 291 }
 292
 293 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 294 {
 295         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 296         struct data_ring *ring;
 297         int status;
 298
 299         /*
 300          * Allocate DMA
 301          */
 302         ring_for_each(rt2x00dev, ring) {
 303                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 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_ring *ring;
 331
 332         /*
 333          * Free irq line.
 334          */
 335         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 336
 337         /*
 338          * Free DMA
 339          */
 340         ring_for_each(rt2x00dev, ring)
 341                 rt2x00pci_free_dma(rt2x00dev, ring);
 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_addr) {
 357                 iounmap(rt2x00dev->csr_addr);
 358                 rt2x00dev->csr_addr = 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_addr = ioremap(pci_resource_start(pci_dev, 0),
 367                                       pci_resource_len(pci_dev, 0));
 368         if (!rt2x00dev->csr_addr)
 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 library");
 540 MODULE_LICENSE("GPL");