drivers/net/wireless/rt2x00/rt2x00pci.c

   1 /*
   2         Copyright (C) 2004 - 2009 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  * Register access.
  36  */
  37 int rt2x00pci_regbusy_read(struct rt2x00_dev *rt2x00dev,
  38                            const unsigned int offset,
  39                            const struct rt2x00_field32 field,
  40                            u32 *reg)
  41 {
  42         unsigned int i;
  43
  44         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  45                 rt2x00pci_register_read(rt2x00dev, offset, reg);
  46                 if (!rt2x00_get_field32(*reg, field))
  47                         return 1;
  48                 udelay(REGISTER_BUSY_DELAY);
  49         }
  50
  51         ERROR(rt2x00dev, "Indirect register access failed: "
  52               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
  53         *reg = ~0;
  54
  55         return 0;
  56 }
  57 EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);
  58
  59 /*
  60  * TX data handlers.
  61  */
  62 int rt2x00pci_write_tx_data(struct queue_entry *entry)
  63 {
  64         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
  65         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  66         struct skb_frame_desc *skbdesc;
  67
  68         /*
  69          * This should not happen, we already checked the entry
  70          * was ours. When the hardware disagrees there has been
  71          * a queue corruption!
  72          */
  73         if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
  74                 ERROR(rt2x00dev,
  75                       "Corrupt queue %d, accessing entry which is not ours.\n"
  76                       "Please file bug report to %s.\n",
  77                       entry->queue->qid, DRV_PROJECT);
  78                 return -EINVAL;
  79         }
  80
  81         /*
  82          * Fill in skb descriptor
  83          */
  84         skbdesc = get_skb_frame_desc(entry->skb);
  85         skbdesc->desc = entry_priv->desc;
  86         skbdesc->desc_len = entry->queue->desc_size;
  87
  88         return 0;
  89 }
  90 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  91
  92 /*
  93  * TX/RX data handlers.
  94  */
  95 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  96 {
  97         struct data_queue *queue = rt2x00dev->rx;
  98         struct queue_entry *entry;
  99         struct queue_entry_priv_pci *entry_priv;
 100         struct skb_frame_desc *skbdesc;
 101
 102         while (1) {
 103                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 104                 entry_priv = entry->priv_data;
 105
 106                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 107                         break;
 108
 109                 /*
 110                  * Fill in desc fields of the skb descriptor
 111                  */
 112                 skbdesc = get_skb_frame_desc(entry->skb);
 113                 skbdesc->desc = entry_priv->desc;
 114                 skbdesc->desc_len = entry->queue->desc_size;
 115
 116                 /*
 117                  * Send the frame to rt2x00lib for further processing.
 118                  */
 119                 rt2x00lib_rxdone(rt2x00dev, entry);
 120         }
 121 }
 122 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 123
 124 /*
 125  * Device initialization handlers.
 126  */
 127 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 128                                      struct data_queue *queue)
 129 {
 130         struct queue_entry_priv_pci *entry_priv;
 131         void *addr;
 132         dma_addr_t dma;
 133         unsigned int i;
 134
 135         /*
 136          * Allocate DMA memory for descriptor and buffer.
 137          */
 138         addr = dma_alloc_coherent(rt2x00dev->dev,
 139                                   queue->limit * queue->desc_size,
 140                                   &dma, GFP_KERNEL | GFP_DMA);
 141         if (!addr)
 142                 return -ENOMEM;
 143
 144         memset(addr, 0, queue->limit * queue->desc_size);
 145
 146         /*
 147          * Initialize all queue entries to contain valid addresses.
 148          */
 149         for (i = 0; i < queue->limit; i++) {
 150                 entry_priv = queue->entries[i].priv_data;
 151                 entry_priv->desc = addr + i * queue->desc_size;
 152                 entry_priv->desc_dma = dma + i * queue->desc_size;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 159                                      struct data_queue *queue)
 160 {
 161         struct queue_entry_priv_pci *entry_priv =
 162             queue->entries[0].priv_data;
 163
 164         if (entry_priv->desc)
 165                 dma_free_coherent(rt2x00dev->dev,
 166                                   queue->limit * queue->desc_size,
 167                                   entry_priv->desc, entry_priv->desc_dma);
 168         entry_priv->desc = NULL;
 169 }
 170
 171 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 172 {
 173         struct data_queue *queue;
 174         int status;
 175
 176         /*
 177          * Allocate DMA
 178          */
 179         queue_for_each(rt2x00dev, queue) {
 180                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 181                 if (status)
 182                         goto exit;
 183         }
 184
 185         /*
 186          * Register interrupt handler.
 187          */
 188         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 189                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 190         if (status) {
 191                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 192                       rt2x00dev->irq, status);
 193                 goto exit;
 194         }
 195
 196         return 0;
 197
 198 exit:
 199         queue_for_each(rt2x00dev, queue)
 200                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 201
 202         return status;
 203 }
 204 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 205
 206 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 207 {
 208         struct data_queue *queue;
 209
 210         /*
 211          * Free irq line.
 212          */
 213         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 214
 215         /*
 216          * Free DMA
 217          */
 218         queue_for_each(rt2x00dev, queue)
 219                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 220 }
 221 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 222
 223 /*
 224  * PCI driver handlers.
 225  */
 226 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 227 {
 228         kfree(rt2x00dev->rf);
 229         rt2x00dev->rf = NULL;
 230
 231         kfree(rt2x00dev->eeprom);
 232         rt2x00dev->eeprom = NULL;
 233
 234         if (rt2x00dev->csr.base) {
 235                 iounmap(rt2x00dev->csr.base);
 236                 rt2x00dev->csr.base = NULL;
 237         }
 238 }
 239
 240 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 241 {
 242         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 243
 244         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 245         if (!rt2x00dev->csr.base)
 246                 goto exit;
 247
 248         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 249         if (!rt2x00dev->eeprom)
 250                 goto exit;
 251
 252         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 253         if (!rt2x00dev->rf)
 254                 goto exit;
 255
 256         return 0;
 257
 258 exit:
 259         ERROR_PROBE("Failed to allocate registers.\n");
 260
 261         rt2x00pci_free_reg(rt2x00dev);
 262
 263         return -ENOMEM;
 264 }
 265
 266 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 267 {
 268         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 269         struct ieee80211_hw *hw;
 270         struct rt2x00_dev *rt2x00dev;
 271         int retval;
 272         u16 chip;
 273
 274         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 275         if (retval) {
 276                 ERROR_PROBE("PCI request regions failed.\n");
 277                 return retval;
 278         }
 279
 280         retval = pci_enable_device(pci_dev);
 281         if (retval) {
 282                 ERROR_PROBE("Enable device failed.\n");
 283                 goto exit_release_regions;
 284         }
 285
 286         pci_set_master(pci_dev);
 287
 288         if (pci_set_mwi(pci_dev))
 289                 ERROR_PROBE("MWI not available.\n");
 290
 291         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 292                 ERROR_PROBE("PCI DMA not supported.\n");
 293                 retval = -EIO;
 294                 goto exit_disable_device;
 295         }
 296
 297         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 298         if (!hw) {
 299                 ERROR_PROBE("Failed to allocate hardware.\n");
 300                 retval = -ENOMEM;
 301                 goto exit_disable_device;
 302         }
 303
 304         pci_set_drvdata(pci_dev, hw);
 305
 306         rt2x00dev = hw->priv;
 307         rt2x00dev->dev = &pci_dev->dev;
 308         rt2x00dev->ops = ops;
 309         rt2x00dev->hw = hw;
 310         rt2x00dev->irq = pci_dev->irq;
 311         rt2x00dev->name = pci_name(pci_dev);
 312
 313         /*
 314          * Determine RT chipset by reading PCI header.
 315          */
 316         pci_read_config_word(pci_dev, PCI_DEVICE_ID, &chip);
 317         rt2x00_set_chip_rt(rt2x00dev, chip);
 318
 319         retval = rt2x00pci_alloc_reg(rt2x00dev);
 320         if (retval)
 321                 goto exit_free_device;
 322
 323         retval = rt2x00lib_probe_dev(rt2x00dev);
 324         if (retval)
 325                 goto exit_free_reg;
 326
 327         return 0;
 328
 329 exit_free_reg:
 330         rt2x00pci_free_reg(rt2x00dev);
 331
 332 exit_free_device:
 333         ieee80211_free_hw(hw);
 334
 335 exit_disable_device:
 336         if (retval != -EBUSY)
 337                 pci_disable_device(pci_dev);
 338
 339 exit_release_regions:
 340         pci_release_regions(pci_dev);
 341
 342         pci_set_drvdata(pci_dev, NULL);
 343
 344         return retval;
 345 }
 346 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 347
 348 void rt2x00pci_remove(struct pci_dev *pci_dev)
 349 {
 350         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 351         struct rt2x00_dev *rt2x00dev = hw->priv;
 352
 353         /*
 354          * Free all allocated data.
 355          */
 356         rt2x00lib_remove_dev(rt2x00dev);
 357         rt2x00pci_free_reg(rt2x00dev);
 358         ieee80211_free_hw(hw);
 359
 360         /*
 361          * Free the PCI device data.
 362          */
 363         pci_set_drvdata(pci_dev, NULL);
 364         pci_disable_device(pci_dev);
 365         pci_release_regions(pci_dev);
 366 }
 367 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 368
 369 #ifdef CONFIG_PM
 370 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 371 {
 372         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 373         struct rt2x00_dev *rt2x00dev = hw->priv;
 374         int retval;
 375
 376         retval = rt2x00lib_suspend(rt2x00dev, state);
 377         if (retval)
 378                 return retval;
 379
 380         pci_save_state(pci_dev);
 381         pci_disable_device(pci_dev);
 382         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 383 }
 384 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 385
 386 int rt2x00pci_resume(struct pci_dev *pci_dev)
 387 {
 388         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 389         struct rt2x00_dev *rt2x00dev = hw->priv;
 390
 391         if (pci_set_power_state(pci_dev, PCI_D0) ||
 392             pci_enable_device(pci_dev) ||
 393             pci_restore_state(pci_dev)) {
 394                 ERROR(rt2x00dev, "Failed to resume device.\n");
 395                 return -EIO;
 396         }
 397
 398         return rt2x00lib_resume(rt2x00dev);
 399 }
 400 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 401 #endif /* CONFIG_PM */
 402
 403 /*
 404  * rt2x00pci module information.
 405  */
 406 MODULE_AUTHOR(DRV_PROJECT);
 407 MODULE_VERSION(DRV_VERSION);
 408 MODULE_DESCRIPTION("rt2x00 pci library");
 409 MODULE_LICENSE("GPL");