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 /*
  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 rxdata_entry_desc desc;
 128         u32 word;
 129
 130         while (1) {
 131                 entry = rt2x00_get_data_entry(ring);
 132                 rxd = entry->priv;
 133                 rt2x00_desc_read(rxd, 0, &word);
 134
 135                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
 136                         break;
 137
 138                 memset(&desc, 0x00, sizeof(desc));
 139                 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
 140
 141                 /*
 142                  * Allocate the sk_buffer, initialize it and copy
 143                  * all data into it.
 144                  */
 145                 skb = dev_alloc_skb(desc.size + NET_IP_ALIGN);
 146                 if (!skb)
 147                         return;
 148
 149                 skb_reserve(skb, NET_IP_ALIGN);
 150                 skb_put(skb, desc.size);
 151                 memcpy(skb->data, entry->data_addr, desc.size);
 152
 153                 /*
 154                  * Send the frame to rt2x00lib for further processing.
 155                  */
 156                 rt2x00lib_rxdone(entry, skb, &desc);
 157
 158                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 159                         rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
 160                         rt2x00_desc_write(rxd, 0, word);
 161                 }
 162
 163                 rt2x00_ring_index_inc(ring);
 164         }
 165 }
 166 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 167
 168 /*
 169  * Device initialization handlers.
 170  */
 171 #define priv_offset(__ring, __i)                                \
 172 ({                                                              \
 173         ring->data_addr + (i * ring->desc_size);                \
 174 })
 175
 176 #define data_addr_offset(__ring, __i)                           \
 177 ({                                                              \
 178         (__ring)->data_addr +                                   \
 179             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 180             ((__i) * (__ring)->data_size);                      \
 181 })
 182
 183 #define data_dma_offset(__ring, __i)                            \
 184 ({                                                              \
 185         (__ring)->data_dma +                                    \
 186             ((__ring)->stats.limit * (__ring)->desc_size) +     \
 187             ((__i) * (__ring)->data_size);                      \
 188 })
 189
 190 static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
 191                                struct data_ring *ring)
 192 {
 193         unsigned int i;
 194
 195         /*
 196          * Allocate DMA memory for descriptor and buffer.
 197          */
 198         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 199                                                rt2x00_get_ring_size(ring),
 200                                                &ring->data_dma);
 201         if (!ring->data_addr)
 202                 return -ENOMEM;
 203
 204         /*
 205          * Initialize all ring entries to contain valid
 206          * addresses.
 207          */
 208         for (i = 0; i < ring->stats.limit; i++) {
 209                 ring->entry[i].priv = priv_offset(ring, i);
 210                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 211                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
 218                                struct data_ring *ring)
 219 {
 220         if (ring->data_addr)
 221                 pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 222                                     rt2x00_get_ring_size(ring),
 223                                     ring->data_addr, ring->data_dma);
 224         ring->data_addr = NULL;
 225 }
 226
 227 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 228 {
 229         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 230         struct data_ring *ring;
 231         int status;
 232
 233         /*
 234          * Allocate DMA
 235          */
 236         ring_for_each(rt2x00dev, ring) {
 237                 status = rt2x00pci_alloc_dma(rt2x00dev, ring);
 238                 if (status)
 239                         goto exit;
 240         }
 241
 242         /*
 243          * Register interrupt handler.
 244          */
 245         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 246                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 247         if (status) {
 248                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 249                       pci_dev->irq, status);
 250                 return status;
 251         }
 252
 253         return 0;
 254
 255 exit:
 256         rt2x00pci_uninitialize(rt2x00dev);
 257
 258         return status;
 259 }
 260 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 261
 262 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 263 {
 264         struct data_ring *ring;
 265
 266         /*
 267          * Free irq line.
 268          */
 269         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 270
 271         /*
 272          * Free DMA
 273          */
 274         ring_for_each(rt2x00dev, ring)
 275                 rt2x00pci_free_dma(rt2x00dev, ring);
 276 }
 277 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 278
 279 /*
 280  * PCI driver handlers.
 281  */
 282 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 283 {
 284         kfree(rt2x00dev->rf);
 285         rt2x00dev->rf = NULL;
 286
 287         kfree(rt2x00dev->eeprom);
 288         rt2x00dev->eeprom = NULL;
 289
 290         if (rt2x00dev->csr_addr) {
 291                 iounmap(rt2x00dev->csr_addr);
 292                 rt2x00dev->csr_addr = NULL;
 293         }
 294 }
 295
 296 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 297 {
 298         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 299
 300         rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
 301                                       pci_resource_len(pci_dev, 0));
 302         if (!rt2x00dev->csr_addr)
 303                 goto exit;
 304
 305         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 306         if (!rt2x00dev->eeprom)
 307                 goto exit;
 308
 309         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 310         if (!rt2x00dev->rf)
 311                 goto exit;
 312
 313         return 0;
 314
 315 exit:
 316         ERROR_PROBE("Failed to allocate registers.\n");
 317
 318         rt2x00pci_free_reg(rt2x00dev);
 319
 320         return -ENOMEM;
 321 }
 322
 323 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 324 {
 325         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 326         struct ieee80211_hw *hw;
 327         struct rt2x00_dev *rt2x00dev;
 328         int retval;
 329
 330         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 331         if (retval) {
 332                 ERROR_PROBE("PCI request regions failed.\n");
 333                 return retval;
 334         }
 335
 336         retval = pci_enable_device(pci_dev);
 337         if (retval) {
 338                 ERROR_PROBE("Enable device failed.\n");
 339                 goto exit_release_regions;
 340         }
 341
 342         pci_set_master(pci_dev);
 343
 344         if (pci_set_mwi(pci_dev))
 345                 ERROR_PROBE("MWI not available.\n");
 346
 347         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 348             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 349                 ERROR_PROBE("PCI DMA not supported.\n");
 350                 retval = -EIO;
 351                 goto exit_disable_device;
 352         }
 353
 354         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 355         if (!hw) {
 356                 ERROR_PROBE("Failed to allocate hardware.\n");
 357                 retval = -ENOMEM;
 358                 goto exit_disable_device;
 359         }
 360
 361         pci_set_drvdata(pci_dev, hw);
 362
 363         rt2x00dev = hw->priv;
 364         rt2x00dev->dev = pci_dev;
 365         rt2x00dev->ops = ops;
 366         rt2x00dev->hw = hw;
 367
 368         retval = rt2x00pci_alloc_reg(rt2x00dev);
 369         if (retval)
 370                 goto exit_free_device;
 371
 372         retval = rt2x00lib_probe_dev(rt2x00dev);
 373         if (retval)
 374                 goto exit_free_reg;
 375
 376         return 0;
 377
 378 exit_free_reg:
 379         rt2x00pci_free_reg(rt2x00dev);
 380
 381 exit_free_device:
 382         ieee80211_free_hw(hw);
 383
 384 exit_disable_device:
 385         if (retval != -EBUSY)
 386                 pci_disable_device(pci_dev);
 387
 388 exit_release_regions:
 389         pci_release_regions(pci_dev);
 390
 391         pci_set_drvdata(pci_dev, NULL);
 392
 393         return retval;
 394 }
 395 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 396
 397 void rt2x00pci_remove(struct pci_dev *pci_dev)
 398 {
 399         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 400         struct rt2x00_dev *rt2x00dev = hw->priv;
 401
 402         /*
 403          * Free all allocated data.
 404          */
 405         rt2x00lib_remove_dev(rt2x00dev);
 406         rt2x00pci_free_reg(rt2x00dev);
 407         ieee80211_free_hw(hw);
 408
 409         /*
 410          * Free the PCI device data.
 411          */
 412         pci_set_drvdata(pci_dev, NULL);
 413         pci_disable_device(pci_dev);
 414         pci_release_regions(pci_dev);
 415 }
 416 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 417
 418 #ifdef CONFIG_PM
 419 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 420 {
 421         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 422         struct rt2x00_dev *rt2x00dev = hw->priv;
 423         int retval;
 424
 425         retval = rt2x00lib_suspend(rt2x00dev, state);
 426         if (retval)
 427                 return retval;
 428
 429         rt2x00pci_free_reg(rt2x00dev);
 430
 431         pci_save_state(pci_dev);
 432         pci_disable_device(pci_dev);
 433         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 434 }
 435 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 436
 437 int rt2x00pci_resume(struct pci_dev *pci_dev)
 438 {
 439         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 440         struct rt2x00_dev *rt2x00dev = hw->priv;
 441         int retval;
 442
 443         if (pci_set_power_state(pci_dev, PCI_D0) ||
 444             pci_enable_device(pci_dev) ||
 445             pci_restore_state(pci_dev)) {
 446                 ERROR(rt2x00dev, "Failed to resume device.\n");
 447                 return -EIO;
 448         }
 449
 450         retval = rt2x00pci_alloc_reg(rt2x00dev);
 451         if (retval)
 452                 return retval;
 453
 454         retval = rt2x00lib_resume(rt2x00dev);
 455         if (retval)
 456                 goto exit_free_reg;
 457
 458         return 0;
 459
 460 exit_free_reg:
 461         rt2x00pci_free_reg(rt2x00dev);
 462
 463         return retval;
 464 }
 465 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 466 #endif /* CONFIG_PM */
 467
 468 /*
 469  * rt2x00pci module information.
 470  */
 471 MODULE_AUTHOR(DRV_PROJECT);
 472 MODULE_VERSION(DRV_VERSION);
 473 MODULE_DESCRIPTION("rt2x00 library");
 474 MODULE_LICENSE("GPL");