package/rt2x00/src/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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00pci"
  30
  31 #include <linux/dma-mapping.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/pci.h>
  35
  36 #include "rt2x00.h"
  37 #include "rt2x00pci.h"
  38
  39 /*
  40  * Beacon handlers.
  41  */
  42 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
  43                             struct ieee80211_tx_control *control)
  44 {
  45         struct rt2x00_dev *rt2x00dev = hw->priv;
  46         struct data_ring *ring =
  47             rt2x00lib_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
  48         struct data_entry *entry = rt2x00_get_data_entry(ring);
  49
  50         /*
  51          * Just in case mac80211 doesn't set this correctly,
  52          * but we need this queue set for the descriptor
  53          * initialization.
  54          */
  55         control->queue = IEEE80211_TX_QUEUE_BEACON;
  56
  57         /*
  58          * Update the beacon entry.
  59          */
  60         memcpy(entry->data_addr, skb->data, skb->len);
  61         rt2x00lib_write_tx_desc(rt2x00dev, entry->priv,
  62                                 (struct ieee80211_hdr *)skb->data,
  63                                 skb->len, control);
  64
  65         /*
  66          * Enable beacon generation.
  67          */
  68         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  69
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  73
  74 /*
  75  * TX data handlers.
  76  */
  77 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  78                             struct data_ring *ring, struct sk_buff *skb,
  79                             struct ieee80211_tx_control *control)
  80 {
  81         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
  82         struct data_entry *entry = rt2x00_get_data_entry(ring);
  83         struct data_desc *txd = entry->priv;
  84         u32 word;
  85
  86         if (rt2x00_ring_full(ring)) {
  87                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
  88                 return -EINVAL;
  89         }
  90
  91         rt2x00_desc_read(txd, 0, &word);
  92
  93         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  94             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
  95                 ERROR(rt2x00dev,
  96                       "Arrived at non-free entry in the non-full queue %d.\n"
  97                       "Please file bug report to %s.\n",
  98                       control->queue, DRV_PROJECT);
  99                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 100                 return -EINVAL;
 101         }
 102
 103         entry->skb = skb;
 104         memcpy(&entry->tx_status.control, control, sizeof(*control));
 105         memcpy(entry->data_addr, skb->data, skb->len);
 106         rt2x00lib_write_tx_desc(rt2x00dev, txd, ieee80211hdr,
 107                                 skb->len, control);
 108
 109         rt2x00_ring_index_inc(ring);
 110
 111         if (rt2x00_ring_full(ring))
 112                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 113
 114         return 0;
 115 }
 116 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 117
 118 /*
 119  * RX data handlers.
 120  */
 121 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 122 {
 123         struct data_ring *ring = rt2x00dev->rx;
 124         struct data_entry *entry;
 125         struct data_desc *rxd;
 126         struct sk_buff *skb;
 127         struct ieee80211_hdr *hdr;
 128         struct rxdata_entry_desc desc;
 129         int header_size;
 130         int align;
 131         u32 word;
 132
 133         while (1) {
 134                 entry = rt2x00_get_data_entry(ring);
 135                 rxd = entry->priv;
 136                 rt2x00_desc_read(rxd, 0, &word);
 137
 138                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 139                         break;
 140
 141                 memset(&desc, 0x00, sizeof(desc));
 142                 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 143
 144                 hdr = (struct ieee80211_hdr *)entry->data_addr;
 145                 header_size =
 146                     ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 147
 148                 /*
 149                  * The data behind the ieee80211 header must be
 150                  * aligned on a 4 byte boundary.
 151                  */
 152                 align = header_size % 4;
 153
 154                 /*
 155                  * Allocate the sk_buffer, initialize it and copy
 156                  * all data into it.
 157                  */
 158                 skb = dev_alloc_skb(desc.size + align);
 159                 if (!skb)
 160                         return;
 161
 162                 skb_reserve(skb, align);
 163                 memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size);
 164
 165                 /*
 166                  * Send the frame to rt2x00lib for further processing.
 167                  */
 168                 rt2x00lib_rxdone(entry, skb, &desc);
 169
 170                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 171                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 172                         rt2x00_desc_write(rxd, 0, word);
 173                 }
 174
 175                 rt2x00_ring_index_inc(ring);
 176         }
 177 }
 178 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 179
 180 /*
 181  * Device initialization handlers.
 182  */
 183 #define priv_offset(__ring, __i)                                \
 184 ({                                                              \
 185         ring->data_addr + (i * ring->desc_size);                \
 186 })
 187
 188 #define data_addr_offset(__ring, __i)                           \
 189 ({                                                              \
 190         (__ring)->data_addr +                                   \
 191             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 192             ((__i) * (__ring)->data_size);                      \
 193 })
 194
 195 #define data_dma_offset(__ring, __i)                            \
 196 ({                                                              \
 197         (__ring)->data_dma +                                    \
 198             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 199             ((__i) * (__ring)->data_size);                      \
 200 })
 201
 202 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 203                                struct data_ring *ring)
 204 {
 205         unsigned int i;
 206
 207         /*
 208          * Allocate DMA memory for descriptor and buffer.
 209          */
 210         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 211                                                rt2x00_get_ring_size(ring),
 212                                                &ring->data_dma);
 213         if (!ring->data_addr)
 214                 return -ENOMEM;
 215
 216         /*
 217          * Initialize all ring entries to contain valid
 218          * addresses.
 219          */
 220         for (i = 0; i < ring->stats.limit; i++) {
 221                 ring->entry[i].priv = priv_offset(ring, i);
 222                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 223                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 224         }
 225
 226         return 0;
 227 }
 228
 229 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 230                                struct data_ring *ring)
 231 {
 232         if (ring->data_addr)
 233                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 234                                     rt2x00_get_ring_size(ring),
 235                                     ring->data_addr, ring->data_dma);
 236         ring->data_addr = NULL;
 237 }
 238
 239 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 240 {
 241         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 242         struct data_ring *ring;
 243         int status;
 244
 245         /*
 246          * Allocate DMA
 247          */
 248         ring_for_each(rt2x00dev, ring) {
 249                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 250                 if (status)
 251                         goto exit;
 252         }
 253
 254         /*
 255          * Register interrupt handler.
 256          */
 257         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 258                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 259         if (status) {
 260                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 261                       pci_dev->irq, status);
 262                 return status;
 263         }
 264
 265         return 0;
 266
 267 exit:
 268         rt2x00pci_uninitialize(rt2x00dev);
 269
 270         return status;
 271 }
 272 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 273
 274 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 275 {
 276         struct data_ring *ring;
 277
 278         /*
 279          * Free irq line.
 280          */
 281         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 282
 283         /*
 284          * Free DMA
 285          */
 286         ring_for_each(rt2x00dev, ring)
 287                 rt2x00pci_free_dma(rt2x00dev, ring);
 288 }
 289 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 290
 291 /*
 292  * PCI driver handlers.
 293  */
 294 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 295 {
 296         kfree(rt2x00dev->rf);
 297         rt2x00dev->rf = NULL;
 298
 299         kfree(rt2x00dev->eeprom);
 300         rt2x00dev->eeprom = NULL;
 301
 302         if (rt2x00dev->csr_addr) {
 303                 iounmap(rt2x00dev->csr_addr);
 304                 rt2x00dev->csr_addr = NULL;
 305         }
 306 }
 307
 308 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 309 {
 310         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 311
 312         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 313                                       pci_resource_len(pci_dev, 0));
 314         if (!rt2x00dev->csr_addr)
 315                 goto exit;
 316
 317         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 318         if (!rt2x00dev->eeprom)
 319                 goto exit;
 320
 321         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 322         if (!rt2x00dev->rf)
 323                 goto exit;
 324
 325         return 0;
 326
 327 exit:
 328         ERROR_PROBE("Failed to allocate registers.\n");
 329
 330         rt2x00pci_free_reg(rt2x00dev);
 331
 332         return -ENOMEM;
 333 }
 334
 335 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 336 {
 337         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 338         struct ieee80211_hw *hw;
 339         struct rt2x00_dev *rt2x00dev;
 340         int retval;
 341
 342         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 343         if (retval) {
 344                 ERROR_PROBE("PCI request regions failed.\n");
 345                 return retval;
 346         }
 347
 348         retval = pci_enable_device(pci_dev);
 349         if (retval) {
 350                 ERROR_PROBE("Enable device failed.\n");
 351                 goto exit_release_regions;
 352         }
 353
 354         pci_set_master(pci_dev);
 355
 356         if (pci_set_mwi(pci_dev))
 357                 ERROR_PROBE("MWI not available.\n");
 358
 359         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 360             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 361                 ERROR_PROBE("PCI DMA not supported.\n");
 362                 retval = -EIO;
 363                 goto exit_disable_device;
 364         }
 365
 366         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 367         if (!hw) {
 368                 ERROR_PROBE("Failed to allocate hardware.\n");
 369                 retval = -ENOMEM;
 370                 goto exit_disable_device;
 371         }
 372
 373         pci_set_drvdata(pci_dev, hw);
 374
 375         rt2x00dev = hw->priv;
 376         rt2x00dev->dev = pci_dev;
 377         rt2x00dev->ops = ops;
 378         rt2x00dev->hw = hw;
 379
 380         retval = rt2x00pci_alloc_reg(rt2x00dev);
 381         if (retval)
 382                 goto exit_free_device;
 383
 384         retval = rt2x00lib_probe_dev(rt2x00dev);
 385         if (retval)
 386                 goto exit_free_reg;
 387
 388         return 0;
 389
 390 exit_free_reg:
 391         rt2x00pci_free_reg(rt2x00dev);
 392
 393 exit_free_device:
 394         ieee80211_free_hw(hw);
 395
 396 exit_disable_device:
 397         if (retval != -EBUSY)
 398                 pci_disable_device(pci_dev);
 399
 400 exit_release_regions:
 401         pci_release_regions(pci_dev);
 402
 403         pci_set_drvdata(pci_dev, NULL);
 404
 405         return retval;
 406 }
 407 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 408
 409 void rt2x00pci_remove(struct pci_dev *pci_dev)
 410 {
 411         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 412         struct rt2x00_dev *rt2x00dev = hw->priv;
 413
 414         /*
 415          * Free all allocated data.
 416          */
 417         rt2x00lib_remove_dev(rt2x00dev);
 418         rt2x00pci_free_reg(rt2x00dev);
 419         ieee80211_free_hw(hw);
 420
 421         /*
 422          * Free the PCI device data.
 423          */
 424         pci_set_drvdata(pci_dev, NULL);
 425         pci_disable_device(pci_dev);
 426         pci_release_regions(pci_dev);
 427 }
 428 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 429
 430 #ifdef CONFIG_PM
 431 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 432 {
 433         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 434         struct rt2x00_dev *rt2x00dev = hw->priv;
 435         int retval;
 436
 437         retval = rt2x00lib_suspend(rt2x00dev, state);
 438         if (retval)
 439                 return retval;
 440
 441         rt2x00pci_free_reg(rt2x00dev);
 442
 443         pci_save_state(pci_dev);
 444         pci_disable_device(pci_dev);
 445         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 446 }
 447 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 448
 449 int rt2x00pci_resume(struct pci_dev *pci_dev)
 450 {
 451         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 452         struct rt2x00_dev *rt2x00dev = hw->priv;
 453         int retval;
 454
 455         if (pci_set_power_state(pci_dev, PCI_D0) ||
 456             pci_enable_device(pci_dev) ||
 457             pci_restore_state(pci_dev)) {
 458                 ERROR(rt2x00dev, "Failed to resume device.\n");
 459                 return -EIO;
 460         }
 461
 462         retval = rt2x00pci_alloc_reg(rt2x00dev);
 463         if (retval)
 464                 return retval;
 465
 466         retval = rt2x00lib_resume(rt2x00dev);
 467         if (retval)
 468                 goto exit_free_reg;
 469
 470         return 0;
 471
 472 exit_free_reg:
 473         rt2x00pci_free_reg(rt2x00dev);
 474
 475         return retval;
 476 }
 477 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 478 #endif /* CONFIG_PM */
 479
 480 /*
 481  * rt2x00pci module information.
 482  */
 483 MODULE_AUTHOR(DRV_PROJECT);
 484 MODULE_VERSION(DRV_VERSION);
 485 MODULE_DESCRIPTION("rt2x00 library");
 486 MODULE_LICENSE("GPL");