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         Supported chipsets: rt2460, rt2560, rt2561, rt2561s & rt2661.
  25  */
  26
  27 /*
  28  * Set enviroment defines for rt2x00.h
  29  */
  30 #define DRV_NAME "rt2x00pci"
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/version.h>
  35 #include <linux/init.h>
  36 #include <linux/pci.h>
  37
  38 #include "rt2x00.h"
  39 #include "rt2x00lib.h"
  40 #include "rt2x00pci.h"
  41
  42 /*
  43  * Beacon handlers.
  44  */
  45 int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
  46         struct ieee80211_tx_control *control)
  47 {
  48         struct rt2x00_dev *rt2x00dev = hw->priv;
  49         struct data_ring *ring =
  50                 rt2x00_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
  51         struct data_entry *entry = rt2x00_get_data_entry(ring);
  52
  53         /*
  54          * Just in case the ieee80211 doesn't set this,
  55          * but we need this queue set for the descriptor
  56          * initialization.
  57          */
  58         control->queue = IEEE80211_TX_QUEUE_BEACON;
  59
  60         /*
  61          * Update the beacon entry.
  62          */
  63         memcpy(entry->data_addr, skb->data, skb->len);
  64         rt2x00lib_write_tx_desc(rt2x00dev, entry, entry->priv,
  65                 (struct ieee80211_hdr*)skb->data, skb->len, control);
  66
  67         /*
  68          * Enable beacon generation.
  69          */
  70         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
  71
  72         return 0;
  73 }
  74 EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
  75
  76 void rt2x00pci_beacondone(struct rt2x00_dev *rt2x00dev, const int queue)
  77 {
  78         struct data_ring *ring = rt2x00_get_ring(rt2x00dev, queue);
  79         struct data_entry *entry = rt2x00_get_data_entry(ring);
  80         struct sk_buff *skb;
  81
  82         skb = ieee80211_beacon_get(rt2x00dev->hw,
  83                 rt2x00dev->interface.id, &entry->tx_status.control);
  84         if (!skb)
  85                 return;
  86
  87         rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, skb,
  88                 &entry->tx_status.control);
  89
  90         dev_kfree_skb(skb);
  91 }
  92 EXPORT_SYMBOL_GPL(rt2x00pci_beacondone);
  93
  94 /*
  95  * TX data handlers.
  96  */
  97 int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
  98         struct data_ring *ring, struct sk_buff *skb,
  99         struct ieee80211_tx_control *control)
 100 {
 101         struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr*)skb->data;
 102         struct data_entry *entry = rt2x00_get_data_entry(ring);
 103         struct data_desc *txd = entry->priv;
 104         u32 word;
 105
 106         if (rt2x00_ring_full(ring)) {
 107                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 108                 return -EINVAL;
 109         }
 110
 111         rt2x00_desc_read(txd, 0, &word);
 112
 113         if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
 114             rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
 115                 ERROR(rt2x00dev,
 116                         "Arrived at non-free entry in the non-full queue %d.\n"
 117                         "Please file bug report to %s.\n",
 118                         control->queue, DRV_PROJECT);
 119                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 120                 return -EINVAL;
 121         }
 122
 123         entry->skb = skb;
 124         memcpy(&entry->tx_status.control, control, sizeof(*control));
 125         memcpy(entry->data_addr, skb->data, skb->len);
 126         rt2x00lib_write_tx_desc(rt2x00dev, entry, txd, ieee80211hdr,
 127                 skb->len, control);
 128
 129         rt2x00_ring_index_inc(ring);
 130
 131         if (rt2x00_ring_full(ring))
 132                 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
 133
 134         return 0;
 135 }
 136 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 137
 138 /*
 139  * RX data handlers.
 140  */
 141 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 142 {
 143         struct data_ring *ring = rt2x00dev->rx;
 144         struct data_entry *entry;
 145         struct data_desc *rxd;
 146         u32 desc;
 147         int signal;
 148         int rssi;
 149         int ofdm;
 150         int size;
 151
 152         while (1) {
 153                 entry = rt2x00_get_data_entry(ring);
 154                 rxd = entry->priv;
 155                 rt2x00_desc_read(rxd, 0, &desc);
 156
 157                 if (rt2x00_get_field32(desc, RXD_ENTRY_OWNER_NIC))
 158                         break;
 159
 160                 size = rt2x00dev->ops->lib->fill_rxdone(
 161                         entry, &signal, &rssi, &ofdm);
 162                 if (size < 0)
 163                         goto skip_entry;
 164
 165                 /*
 166                  * Send the packet to upper layer.
 167                  */
 168                 rt2x00lib_rxdone(entry, entry->data_addr, size,
 169                         signal, rssi, ofdm);
 170
 171 skip_entry:
 172                 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
 173                         rt2x00_set_field32(&desc, RXD_ENTRY_OWNER_NIC, 1);
 174                         rt2x00_desc_write(rxd, 0, desc);
 175                 }
 176
 177                 rt2x00_ring_index_inc(ring);
 178         }
 179 }
 180 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 181
 182 /*
 183  * Device initialization handlers.
 184  */
 185 #define priv_offset(__ring, __i)                                \
 186 ({                                                              \
 187         ring->data_addr + (i * ring->desc_size);                \
 188 })
 189
 190 #define data_addr_offset(__ring, __i)                           \
 191 ({                                                              \
 192         (__ring)->data_addr                                     \
 193                 + ((__ring)->stats.limit * (__ring)->desc_size) \
 194                 + ((__i) * (__ring)->data_size);                \
 195 })
 196
 197 #define data_dma_offset(__ring, __i)                            \
 198 ({                                                              \
 199         (__ring)->data_dma                                      \
 200                 + ((__ring)->stats.limit * (__ring)->desc_size) \
 201                 + ((__i) * (__ring)->data_size);                \
 202 })
 203
 204 static int rt2x00pci_alloc_ring(struct rt2x00_dev *rt2x00dev,
 205         struct data_ring *ring)
 206 {
 207         unsigned int i;
 208
 209         /*
 210          * Allocate DMA memory for descriptor and buffer.
 211          */
 212         ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
 213                 rt2x00_get_ring_size(ring), &ring->data_dma);
 214         if (!ring->data_addr)
 215                 return -ENOMEM;
 216
 217         /*
 218          * Initialize all ring entries to contain valid
 219          * addresses.
 220          */
 221         for (i = 0; i < ring->stats.limit; i++) {
 222                 ring->entry[i].priv = priv_offset(ring, i);
 223                 ring->entry[i].data_addr = data_addr_offset(ring, i);
 224                 ring->entry[i].data_dma = data_dma_offset(ring, i);
 225         }
 226
 227         return 0;
 228 }
 229
 230 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 231 {
 232         struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
 233         struct data_ring *ring;
 234         int status;
 235
 236         /*
 237          * Allocate DMA
 238          */
 239         ring_for_each(rt2x00dev, ring) {
 240                 status = rt2x00pci_alloc_ring(rt2x00dev, ring);
 241                 if (status)
 242                         goto exit;
 243         }
 244
 245         /*
 246          * Register interrupt handler.
 247          */
 248         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 249                 IRQF_SHARED, pci_dev->driver->name, rt2x00dev);
 250         if (status) {
 251                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 252                         pci_dev->irq, status);
 253                 return status;
 254         }
 255
 256         return 0;
 257
 258 exit:
 259         rt2x00pci_uninitialize(rt2x00dev);
 260
 261         return status;
 262 }
 263 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 264
 265 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 266 {
 267         struct data_ring *ring;
 268
 269         /*
 270          * Free irq line.
 271          */
 272         free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
 273
 274         /*
 275          * Free DMA
 276          */
 277         ring_for_each(rt2x00dev, ring) {
 278                 if (ring->data_addr)
 279                         pci_free_consistent(rt2x00dev_pci(rt2x00dev),
 280                                 rt2x00_get_ring_size(ring),
 281                                 ring->data_addr, ring->data_dma);
 282                 ring->data_addr = NULL;
 283         }
 284 }
 285 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 286
 287 /*
 288  * PCI driver handlers.
 289  */
 290 static int rt2x00pci_alloc_csr(struct rt2x00_dev *rt2x00dev)
 291 {
 292         rt2x00dev->csr_addr = ioremap(
 293                 pci_resource_start(rt2x00dev_pci(rt2x00dev), 0),
 294                 pci_resource_len(rt2x00dev_pci(rt2x00dev), 0));
 295         if (!rt2x00dev->csr_addr) {
 296                 ERROR(rt2x00dev, "Ioremap failed.\n");
 297                 return -ENOMEM;
 298         }
 299
 300         return 0;
 301 }
 302
 303 static void rt2x00pci_free_csr(struct rt2x00_dev *rt2x00dev)
 304 {
 305         if (rt2x00dev->csr_addr) {
 306                 iounmap(rt2x00dev->csr_addr);
 307                 rt2x00dev->csr_addr = NULL;
 308         }
 309 }
 310
 311 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 312 {
 313         struct rt2x00_ops *ops = (struct rt2x00_ops*)id->driver_data;
 314         struct ieee80211_hw *hw;
 315         struct rt2x00_dev *rt2x00dev;
 316         int retval;
 317
 318         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 319         if (retval) {
 320                 ERROR_PROBE("PCI request regions failed.\n");
 321                 return retval;
 322         }
 323
 324         retval = pci_enable_device(pci_dev);
 325         if (retval) {
 326                 ERROR_PROBE("Enable device failed.\n");
 327                 goto exit_release_regions;
 328         }
 329
 330         pci_set_master(pci_dev);
 331
 332         if (pci_set_mwi(pci_dev))
 333                 ERROR_PROBE("MWI not available.\n");
 334
 335         if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
 336             pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
 337                 ERROR_PROBE("PCI DMA not supported.\n");
 338                 retval = -EIO;
 339                 goto exit_disable_device;
 340         }
 341
 342         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 343         if (!hw) {
 344                 ERROR_PROBE("Failed to allocate hardware.\n");
 345                 retval = -ENOMEM;
 346                 goto exit_disable_device;
 347         }
 348
 349         pci_set_drvdata(pci_dev, hw);
 350
 351         rt2x00dev = hw->priv;
 352         rt2x00dev->dev = pci_dev;
 353         rt2x00dev->ops = ops;
 354         rt2x00dev->hw = hw;
 355
 356         retval = rt2x00pci_alloc_csr(rt2x00dev);
 357         if (retval)
 358                 goto exit_free_device;
 359
 360         retval = rt2x00lib_probe_dev(rt2x00dev);
 361         if (retval)
 362                 goto exit_free_csr;
 363
 364         return 0;
 365
 366 exit_free_csr:
 367         rt2x00pci_free_csr(rt2x00dev);
 368
 369 exit_free_device:
 370         ieee80211_free_hw(hw);
 371
 372 exit_disable_device:
 373         if (retval != -EBUSY)
 374                 pci_disable_device(pci_dev);
 375
 376 exit_release_regions:
 377         pci_release_regions(pci_dev);
 378
 379         pci_set_drvdata(pci_dev, NULL);
 380
 381         return retval;
 382 }
 383 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 384
 385 void rt2x00pci_remove(struct pci_dev *pci_dev)
 386 {
 387         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 388         struct rt2x00_dev *rt2x00dev = hw->priv;
 389
 390         /*
 391          * Free all allocated data.
 392          */
 393         rt2x00lib_remove_dev(rt2x00dev);
 394         ieee80211_free_hw(hw);
 395
 396         /*
 397          * Free the PCI device data.
 398          */
 399         pci_set_drvdata(pci_dev, NULL);
 400         pci_disable_device(pci_dev);
 401         pci_release_regions(pci_dev);
 402 }
 403 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 404
 405 #ifdef CONFIG_PM
 406 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 407 {
 408         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 409         struct rt2x00_dev *rt2x00dev = hw->priv;
 410         int retval;
 411
 412         retval = rt2x00lib_suspend(rt2x00dev, state);
 413         if (retval)
 414                 return retval;
 415
 416         rt2x00pci_free_csr(rt2x00dev);
 417
 418         pci_save_state(pci_dev);
 419         pci_disable_device(pci_dev);
 420         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 421 }
 422 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 423
 424 int rt2x00pci_resume(struct pci_dev *pci_dev)
 425 {
 426         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 427         struct rt2x00_dev *rt2x00dev = hw->priv;
 428         int retval;
 429
 430         if (pci_set_power_state(pci_dev, PCI_D0) ||
 431             pci_enable_device(pci_dev) ||
 432             pci_restore_state(pci_dev)) {
 433                 ERROR(rt2x00dev, "Failed to resume device.\n");
 434                 return -EIO;
 435         }
 436
 437         retval = rt2x00pci_alloc_csr(rt2x00dev);
 438         if (retval)
 439                 return retval;
 440
 441         return rt2x00lib_resume(rt2x00dev);
 442 }
 443 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 444 #endif /* CONFIG_PM */
 445
 446 /*
 447  * rt2x00pci module information.
 448  */
 449 MODULE_AUTHOR(DRV_PROJECT);
 450 MODULE_VERSION(DRV_VERSION);
 451 MODULE_DESCRIPTION("rt2x00 library");
 452 MODULE_LICENSE("GPL");