drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2008 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  * TX data handlers.
  36  */
  37 int rt2x00pci_write_tx_data(struct queue_entry *entry)
  38 {
  39         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  40         struct skb_frame_desc *skbdesc;
  41         u32 word;
  42
  43         rt2x00_desc_read(entry_priv->desc, 0, &word);
  44
  45         /*
  46          * This should not happen, we already checked the entry
  47          * was ours. When the hardware disagrees there has been
  48          * a queue corruption!
  49          */
  50         if (unlikely(rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
  51                      rt2x00_get_field32(word, TXD_ENTRY_VALID))) {
  52                 ERROR(entry->queue->rt2x00dev,
  53                       "Corrupt queue %d, accessing entry which is not ours.\n"
  54                       "Please file bug report to %s.\n",
  55                       entry->queue->qid, DRV_PROJECT);
  56                 return -EINVAL;
  57         }
  58
  59         /*
  60          * Fill in skb descriptor
  61          */
  62         skbdesc = get_skb_frame_desc(entry->skb);
  63         skbdesc->desc = entry_priv->desc;
  64         skbdesc->desc_len = entry->queue->desc_size;
  65
  66         return 0;
  67 }
  68 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  69
  70 /*
  71  * TX/RX data handlers.
  72  */
  73 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  74 {
  75         struct data_queue *queue = rt2x00dev->rx;
  76         struct queue_entry *entry;
  77         struct queue_entry_priv_pci *entry_priv;
  78         struct skb_frame_desc *skbdesc;
  79         u32 word;
  80
  81         while (1) {
  82                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  83                 entry_priv = entry->priv_data;
  84                 rt2x00_desc_read(entry_priv->desc, 0, &word);
  85
  86                 if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
  87                         break;
  88
  89                 /*
  90                  * Fill in desc fields of the skb descriptor
  91                  */
  92                 skbdesc = get_skb_frame_desc(entry->skb);
  93                 skbdesc->desc = entry_priv->desc;
  94                 skbdesc->desc_len = entry->queue->desc_size;
  95
  96                 /*
  97                  * Send the frame to rt2x00lib for further processing.
  98                  */
  99                 rt2x00lib_rxdone(rt2x00dev, entry);
 100         }
 101 }
 102 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 103
 104 /*
 105  * Device initialization handlers.
 106  */
 107 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 108                                      struct data_queue *queue)
 109 {
 110         struct queue_entry_priv_pci *entry_priv;
 111         void *addr;
 112         dma_addr_t dma;
 113         unsigned int i;
 114
 115         /*
 116          * Allocate DMA memory for descriptor and buffer.
 117          */
 118         addr = dma_alloc_coherent(rt2x00dev->dev,
 119                                   queue->limit * queue->desc_size,
 120                                   &dma, GFP_KERNEL | GFP_DMA);
 121         if (!addr)
 122                 return -ENOMEM;
 123
 124         memset(addr, 0, queue->limit * queue->desc_size);
 125
 126         /*
 127          * Initialize all queue entries to contain valid addresses.
 128          */
 129         for (i = 0; i < queue->limit; i++) {
 130                 entry_priv = queue->entries[i].priv_data;
 131                 entry_priv->desc = addr + i * queue->desc_size;
 132                 entry_priv->desc_dma = dma + i * queue->desc_size;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 139                                      struct data_queue *queue)
 140 {
 141         struct queue_entry_priv_pci *entry_priv =
 142             queue->entries[0].priv_data;
 143
 144         if (entry_priv->desc)
 145                 dma_free_coherent(rt2x00dev->dev,
 146                                   queue->limit * queue->desc_size,
 147                                   entry_priv->desc, entry_priv->desc_dma);
 148         entry_priv->desc = NULL;
 149 }
 150
 151 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 152 {
 153         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 154         struct data_queue *queue;
 155         int status;
 156
 157         /*
 158          * Allocate DMA
 159          */
 160         queue_for_each(rt2x00dev, queue) {
 161                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 162                 if (status)
 163                         goto exit;
 164         }
 165
 166         /*
 167          * Register interrupt handler.
 168          */
 169         status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
 170                              IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
 171         if (status) {
 172                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 173                       pci_dev->irq, status);
 174                 goto exit;
 175         }
 176
 177         return 0;
 178
 179 exit:
 180         queue_for_each(rt2x00dev, queue)
 181                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 182
 183         return status;
 184 }
 185 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 186
 187 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 188 {
 189         struct data_queue *queue;
 190
 191         /*
 192          * Free irq line.
 193          */
 194         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 195
 196         /*
 197          * Free DMA
 198          */
 199         queue_for_each(rt2x00dev, queue)
 200                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 201 }
 202 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 203
 204 /*
 205  * PCI driver handlers.
 206  */
 207 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 208 {
 209         kfree(rt2x00dev->rf);
 210         rt2x00dev->rf = NULL;
 211
 212         kfree(rt2x00dev->eeprom);
 213         rt2x00dev->eeprom = NULL;
 214
 215         if (rt2x00dev->csr.base) {
 216                 iounmap(rt2x00dev->csr.base);
 217                 rt2x00dev->csr.base = NULL;
 218         }
 219 }
 220
 221 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 222 {
 223         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 224
 225         rt2x00dev->csr.base = ioremap(pci_resource_start(pci_dev, 0),
 226                                       pci_resource_len(pci_dev, 0));
 227         if (!rt2x00dev->csr.base)
 228                 goto exit;
 229
 230         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 231         if (!rt2x00dev->eeprom)
 232                 goto exit;
 233
 234         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 235         if (!rt2x00dev->rf)
 236                 goto exit;
 237
 238         return 0;
 239
 240 exit:
 241         ERROR_PROBE("Failed to allocate registers.\n");
 242
 243         rt2x00pci_free_reg(rt2x00dev);
 244
 245         return -ENOMEM;
 246 }
 247
 248 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 249 {
 250         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 251         struct ieee80211_hw *hw;
 252         struct rt2x00_dev *rt2x00dev;
 253         int retval;
 254
 255         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 256         if (retval) {
 257                 ERROR_PROBE("PCI request regions failed.\n");
 258                 return retval;
 259         }
 260
 261         retval = pci_enable_device(pci_dev);
 262         if (retval) {
 263                 ERROR_PROBE("Enable device failed.\n");
 264                 goto exit_release_regions;
 265         }
 266
 267         pci_set_master(pci_dev);
 268
 269         if (pci_set_mwi(pci_dev))
 270                 ERROR_PROBE("MWI not available.\n");
 271
 272         if (dma_set_mask(&pci_dev->dev, DMA_32BIT_MASK)) {
 273                 ERROR_PROBE("PCI DMA not supported.\n");
 274                 retval = -EIO;
 275                 goto exit_disable_device;
 276         }
 277
 278         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 279         if (!hw) {
 280                 ERROR_PROBE("Failed to allocate hardware.\n");
 281                 retval = -ENOMEM;
 282                 goto exit_disable_device;
 283         }
 284
 285         pci_set_drvdata(pci_dev, hw);
 286
 287         rt2x00dev = hw->priv;
 288         rt2x00dev->dev = &pci_dev->dev;
 289         rt2x00dev->ops = ops;
 290         rt2x00dev->hw = hw;
 291
 292         retval = rt2x00pci_alloc_reg(rt2x00dev);
 293         if (retval)
 294                 goto exit_free_device;
 295
 296         retval = rt2x00lib_probe_dev(rt2x00dev);
 297         if (retval)
 298                 goto exit_free_reg;
 299
 300         return 0;
 301
 302 exit_free_reg:
 303         rt2x00pci_free_reg(rt2x00dev);
 304
 305 exit_free_device:
 306         ieee80211_free_hw(hw);
 307
 308 exit_disable_device:
 309         if (retval != -EBUSY)
 310                 pci_disable_device(pci_dev);
 311
 312 exit_release_regions:
 313         pci_release_regions(pci_dev);
 314
 315         pci_set_drvdata(pci_dev, NULL);
 316
 317         return retval;
 318 }
 319 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 320
 321 void rt2x00pci_remove(struct pci_dev *pci_dev)
 322 {
 323         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 324         struct rt2x00_dev *rt2x00dev = hw->priv;
 325
 326         /*
 327          * Free all allocated data.
 328          */
 329         rt2x00lib_remove_dev(rt2x00dev);
 330         rt2x00pci_free_reg(rt2x00dev);
 331         ieee80211_free_hw(hw);
 332
 333         /*
 334          * Free the PCI device data.
 335          */
 336         pci_set_drvdata(pci_dev, NULL);
 337         pci_disable_device(pci_dev);
 338         pci_release_regions(pci_dev);
 339 }
 340 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 341
 342 #ifdef CONFIG_PM
 343 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 344 {
 345         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 346         struct rt2x00_dev *rt2x00dev = hw->priv;
 347         int retval;
 348
 349         retval = rt2x00lib_suspend(rt2x00dev, state);
 350         if (retval)
 351                 return retval;
 352
 353         rt2x00pci_free_reg(rt2x00dev);
 354
 355         pci_save_state(pci_dev);
 356         pci_disable_device(pci_dev);
 357         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 358 }
 359 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 360
 361 int rt2x00pci_resume(struct pci_dev *pci_dev)
 362 {
 363         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 364         struct rt2x00_dev *rt2x00dev = hw->priv;
 365         int retval;
 366
 367         if (pci_set_power_state(pci_dev, PCI_D0) ||
 368             pci_enable_device(pci_dev) ||
 369             pci_restore_state(pci_dev)) {
 370                 ERROR(rt2x00dev, "Failed to resume device.\n");
 371                 return -EIO;
 372         }
 373
 374         retval = rt2x00pci_alloc_reg(rt2x00dev);
 375         if (retval)
 376                 return retval;
 377
 378         retval = rt2x00lib_resume(rt2x00dev);
 379         if (retval)
 380                 goto exit_free_reg;
 381
 382         return 0;
 383
 384 exit_free_reg:
 385         rt2x00pci_free_reg(rt2x00dev);
 386
 387         return retval;
 388 }
 389 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 390 #endif /* CONFIG_PM */
 391
 392 /*
 393  * rt2x00pci module information.
 394  */
 395 MODULE_AUTHOR(DRV_PROJECT);
 396 MODULE_VERSION(DRV_VERSION);
 397 MODULE_DESCRIPTION("rt2x00 pci library");
 398 MODULE_LICENSE("GPL");