drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   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 #include <linux/slab.h>
  31
  32 #include "rt2x00.h"
  33 #include "rt2x00pci.h"
  34
  35 /*
  36  * Register access.
  37  */
  38 int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
  39                            const unsigned int offset,
  40                            const struct rt2x00_field32 field,
  41                            u32 *reg)
  42 {
  43         unsigned int i;
  44
  45         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  46                 return 0;
  47
  48         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  49                 rt2x00pci_register_read(rt2x00dev, offset, reg);
  50                 if (!rt2x00_get_field32(*reg, field))
  51                         return 1;
  52                 udelay(REGISTER_BUSY_DELAY);
  53         }
  54
  55         ERROR(rt2x00dev, "Indirect register access failed: "
  56               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
  57         *reg = ~0;
  58
  59         return 0;
  60 }
  61 EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);
  62
  63 /*
  64  * TX data handlers.
  65  */
  66 int rt2x00pci_write_tx_data(struct queue_entry *entry,
  67                             struct txentry_desc *txdesc)
  68 {
  69         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
  70
  71         /*
  72          * This should not happen, we already checked the entry
  73          * was ours. When the hardware disagrees there has been
  74          * a queue corruption!
  75          */
  76         if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
  77                 ERROR(rt2x00dev,
  78                       "Corrupt queue %d, accessing entry which is not ours.\n"
  79                       "Please file bug report to %s.\n",
  80                       entry->queue->qid, DRV_PROJECT);
  81                 return -EINVAL;
  82         }
  83
  84         /*
  85          * Add the requested extra tx headroom in front of the skb.
  86          */
  87         skb_push(entry->skb, rt2x00dev->ops->extra_tx_headroom);
  88         memset(entry->skb->data, 0, rt2x00dev->ops->extra_tx_headroom);
  89
  90         /*
  91          * Call the driver's write_tx_datadesc function, if it exists.
  92          */
  93         if (rt2x00dev->ops->lib->write_tx_datadesc)
  94                 rt2x00dev->ops->lib->write_tx_datadesc(entry, txdesc);
  95
  96         /*
  97          * Map the skb to DMA.
  98          */
  99         if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
 100                 rt2x00queue_map_txskb(rt2x00dev, entry->skb);
 101
 102         return 0;
 103 }
 104 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
 105
 106 /*
 107  * TX/RX data handlers.
 108  */
 109 void rt2x00pci_txdone(struct queue_entry *entry,
 110                       struct txdone_entry_desc *txdesc)
 111 {
 112         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 113         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 114
 115         /*
 116          * Unmap the skb.
 117          */
 118         rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
 119
 120         /*
 121          * Remove the extra tx headroom from the skb.
 122          */
 123         skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
 124
 125         /*
 126          * Signal that the TX descriptor is no longer in the skb.
 127          */
 128         skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
 129
 130         /*
 131          * Pass on to rt2x00lib.
 132          */
 133         rt2x00lib_txdone(entry, txdesc);
 134 }
 135 EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
 136
 137 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 138 {
 139         struct data_queue *queue = rt2x00dev->rx;
 140         struct queue_entry *entry;
 141         struct queue_entry_priv_pci *entry_priv;
 142         struct skb_frame_desc *skbdesc;
 143
 144         while (1) {
 145                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 146                 entry_priv = entry->priv_data;
 147
 148                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 149                         break;
 150
 151                 /*
 152                  * Fill in desc fields of the skb descriptor
 153                  */
 154                 skbdesc = get_skb_frame_desc(entry->skb);
 155                 skbdesc->desc = entry_priv->desc;
 156                 skbdesc->desc_len = entry->queue->desc_size;
 157
 158                 /*
 159                  * Send the frame to rt2x00lib for further processing.
 160                  */
 161                 rt2x00lib_rxdone(rt2x00dev, entry);
 162         }
 163 }
 164 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 165
 166 /*
 167  * Device initialization handlers.
 168  */
 169 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 170                                      struct data_queue *queue)
 171 {
 172         struct queue_entry_priv_pci *entry_priv;
 173         void *addr;
 174         dma_addr_t dma;
 175         unsigned int i;
 176
 177         /*
 178          * Allocate DMA memory for descriptor and buffer.
 179          */
 180         addr = dma_alloc_coherent(rt2x00dev->dev,
 181                                   queue->limit * queue->desc_size,
 182                                   &dma, GFP_KERNEL | GFP_DMA);
 183         if (!addr)
 184                 return -ENOMEM;
 185
 186         memset(addr, 0, queue->limit * queue->desc_size);
 187
 188         /*
 189          * Initialize all queue entries to contain valid addresses.
 190          */
 191         for (i = 0; i < queue->limit; i++) {
 192                 entry_priv = queue->entries[i].priv_data;
 193                 entry_priv->desc = addr + i * queue->desc_size;
 194                 entry_priv->desc_dma = dma + i * queue->desc_size;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 201                                      struct data_queue *queue)
 202 {
 203         struct queue_entry_priv_pci *entry_priv =
 204             queue->entries[0].priv_data;
 205
 206         if (entry_priv->desc)
 207                 dma_free_coherent(rt2x00dev->dev,
 208                                   queue->limit * queue->desc_size,
 209                                   entry_priv->desc, entry_priv->desc_dma);
 210         entry_priv->desc = NULL;
 211 }
 212
 213 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 214 {
 215         struct data_queue *queue;
 216         int status;
 217
 218         /*
 219          * Allocate DMA
 220          */
 221         queue_for_each(rt2x00dev, queue) {
 222                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 223                 if (status)
 224                         goto exit;
 225         }
 226
 227         /*
 228          * Register interrupt handler.
 229          */
 230         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 231                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 232         if (status) {
 233                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 234                       rt2x00dev->irq, status);
 235                 goto exit;
 236         }
 237
 238         return 0;
 239
 240 exit:
 241         queue_for_each(rt2x00dev, queue)
 242                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 243
 244         return status;
 245 }
 246 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 247
 248 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 249 {
 250         struct data_queue *queue;
 251
 252         /*
 253          * Free irq line.
 254          */
 255         free_irq(rt2x00dev->irq, rt2x00dev);
 256
 257         /*
 258          * Free DMA
 259          */
 260         queue_for_each(rt2x00dev, queue)
 261                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 262 }
 263 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 264
 265 /*
 266  * PCI driver handlers.
 267  */
 268 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 269 {
 270         kfree(rt2x00dev->rf);
 271         rt2x00dev->rf = NULL;
 272
 273         kfree(rt2x00dev->eeprom);
 274         rt2x00dev->eeprom = NULL;
 275
 276         if (rt2x00dev->csr.base) {
 277                 iounmap(rt2x00dev->csr.base);
 278                 rt2x00dev->csr.base = NULL;
 279         }
 280 }
 281
 282 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 283 {
 284         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 285
 286         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 287         if (!rt2x00dev->csr.base)
 288                 goto exit;
 289
 290         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 291         if (!rt2x00dev->eeprom)
 292                 goto exit;
 293
 294         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 295         if (!rt2x00dev->rf)
 296                 goto exit;
 297
 298         return 0;
 299
 300 exit:
 301         ERROR_PROBE("Failed to allocate registers.\n");
 302
 303         rt2x00pci_free_reg(rt2x00dev);
 304
 305         return -ENOMEM;
 306 }
 307
 308 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 309 {
 310         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 311         struct ieee80211_hw *hw;
 312         struct rt2x00_dev *rt2x00dev;
 313         int retval;
 314
 315         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 316         if (retval) {
 317                 ERROR_PROBE("PCI request regions failed.\n");
 318                 return retval;
 319         }
 320
 321         retval = pci_enable_device(pci_dev);
 322         if (retval) {
 323                 ERROR_PROBE("Enable device failed.\n");
 324                 goto exit_release_regions;
 325         }
 326
 327         pci_set_master(pci_dev);
 328
 329         if (pci_set_mwi(pci_dev))
 330                 ERROR_PROBE("MWI not available.\n");
 331
 332         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 333                 ERROR_PROBE("PCI DMA not supported.\n");
 334                 retval = -EIO;
 335                 goto exit_disable_device;
 336         }
 337
 338         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 339         if (!hw) {
 340                 ERROR_PROBE("Failed to allocate hardware.\n");
 341                 retval = -ENOMEM;
 342                 goto exit_disable_device;
 343         }
 344
 345         pci_set_drvdata(pci_dev, hw);
 346
 347         rt2x00dev = hw->priv;
 348         rt2x00dev->dev = &pci_dev->dev;
 349         rt2x00dev->ops = ops;
 350         rt2x00dev->hw = hw;
 351         rt2x00dev->irq = pci_dev->irq;
 352         rt2x00dev->name = pci_name(pci_dev);
 353
 354         if (pci_dev->is_pcie)
 355                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 356         else
 357                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 358
 359         retval = rt2x00pci_alloc_reg(rt2x00dev);
 360         if (retval)
 361                 goto exit_free_device;
 362
 363         retval = rt2x00lib_probe_dev(rt2x00dev);
 364         if (retval)
 365                 goto exit_free_reg;
 366
 367         return 0;
 368
 369 exit_free_reg:
 370         rt2x00pci_free_reg(rt2x00dev);
 371
 372 exit_free_device:
 373         ieee80211_free_hw(hw);
 374
 375 exit_disable_device:
 376         if (retval != -EBUSY)
 377                 pci_disable_device(pci_dev);
 378
 379 exit_release_regions:
 380         pci_release_regions(pci_dev);
 381
 382         pci_set_drvdata(pci_dev, NULL);
 383
 384         return retval;
 385 }
 386 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 387
 388 void rt2x00pci_remove(struct pci_dev *pci_dev)
 389 {
 390         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 391         struct rt2x00_dev *rt2x00dev = hw->priv;
 392
 393         /*
 394          * Free all allocated data.
 395          */
 396         rt2x00lib_remove_dev(rt2x00dev);
 397         rt2x00pci_free_reg(rt2x00dev);
 398         ieee80211_free_hw(hw);
 399
 400         /*
 401          * Free the PCI device data.
 402          */
 403         pci_set_drvdata(pci_dev, NULL);
 404         pci_disable_device(pci_dev);
 405         pci_release_regions(pci_dev);
 406 }
 407 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 408
 409 #ifdef CONFIG_PM
 410 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 411 {
 412         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 413         struct rt2x00_dev *rt2x00dev = hw->priv;
 414         int retval;
 415
 416         retval = rt2x00lib_suspend(rt2x00dev, state);
 417         if (retval)
 418                 return retval;
 419
 420         pci_save_state(pci_dev);
 421         pci_disable_device(pci_dev);
 422         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 423 }
 424 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 425
 426 int rt2x00pci_resume(struct pci_dev *pci_dev)
 427 {
 428         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 429         struct rt2x00_dev *rt2x00dev = hw->priv;
 430
 431         if (pci_set_power_state(pci_dev, PCI_D0) ||
 432             pci_enable_device(pci_dev) ||
 433             pci_restore_state(pci_dev)) {
 434                 ERROR(rt2x00dev, "Failed to resume device.\n");
 435                 return -EIO;
 436         }
 437
 438         return rt2x00lib_resume(rt2x00dev);
 439 }
 440 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 441 #endif /* CONFIG_PM */
 442
 443 /*
 444  * rt2x00pci module information.
 445  */
 446 MODULE_AUTHOR(DRV_PROJECT);
 447 MODULE_VERSION(DRV_VERSION);
 448 MODULE_DESCRIPTION("rt2x00 pci library");
 449 MODULE_LICENSE("GPL");