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