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         return 0;
  85 }
  86 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  87
  88 /*
  89  * TX/RX data handlers.
  90  */
  91 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  92 {
  93         struct data_queue *queue = rt2x00dev->rx;
  94         struct queue_entry *entry;
  95         struct queue_entry_priv_pci *entry_priv;
  96         struct skb_frame_desc *skbdesc;
  97
  98         while (1) {
  99                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 100                 entry_priv = entry->priv_data;
 101
 102                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 103                         break;
 104
 105                 /*
 106                  * Fill in desc fields of the skb descriptor
 107                  */
 108                 skbdesc = get_skb_frame_desc(entry->skb);
 109                 skbdesc->desc = entry_priv->desc;
 110                 skbdesc->desc_len = entry->queue->desc_size;
 111
 112                 /*
 113                  * Send the frame to rt2x00lib for further processing.
 114                  */
 115                 rt2x00lib_rxdone(rt2x00dev, entry);
 116         }
 117 }
 118 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 119
 120 /*
 121  * Device initialization handlers.
 122  */
 123 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 124                                      struct data_queue *queue)
 125 {
 126         struct queue_entry_priv_pci *entry_priv;
 127         void *addr;
 128         dma_addr_t dma;
 129         unsigned int i;
 130
 131         /*
 132          * Allocate DMA memory for descriptor and buffer.
 133          */
 134         addr = dma_alloc_coherent(rt2x00dev->dev,
 135                                   queue->limit * queue->desc_size,
 136                                   &dma, GFP_KERNEL | GFP_DMA);
 137         if (!addr)
 138                 return -ENOMEM;
 139
 140         memset(addr, 0, queue->limit * queue->desc_size);
 141
 142         /*
 143          * Initialize all queue entries to contain valid addresses.
 144          */
 145         for (i = 0; i < queue->limit; i++) {
 146                 entry_priv = queue->entries[i].priv_data;
 147                 entry_priv->desc = addr + i * queue->desc_size;
 148                 entry_priv->desc_dma = dma + i * queue->desc_size;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 155                                      struct data_queue *queue)
 156 {
 157         struct queue_entry_priv_pci *entry_priv =
 158             queue->entries[0].priv_data;
 159
 160         if (entry_priv->desc)
 161                 dma_free_coherent(rt2x00dev->dev,
 162                                   queue->limit * queue->desc_size,
 163                                   entry_priv->desc, entry_priv->desc_dma);
 164         entry_priv->desc = NULL;
 165 }
 166
 167 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 168 {
 169         struct data_queue *queue;
 170         int status;
 171
 172         /*
 173          * Allocate DMA
 174          */
 175         queue_for_each(rt2x00dev, queue) {
 176                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 177                 if (status)
 178                         goto exit;
 179         }
 180
 181         /*
 182          * Register interrupt handler.
 183          */
 184         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 185                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 186         if (status) {
 187                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 188                       rt2x00dev->irq, status);
 189                 goto exit;
 190         }
 191
 192         return 0;
 193
 194 exit:
 195         queue_for_each(rt2x00dev, queue)
 196                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 197
 198         return status;
 199 }
 200 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 201
 202 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 203 {
 204         struct data_queue *queue;
 205
 206         /*
 207          * Free irq line.
 208          */
 209         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 210
 211         /*
 212          * Free DMA
 213          */
 214         queue_for_each(rt2x00dev, queue)
 215                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 216 }
 217 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 218
 219 /*
 220  * PCI driver handlers.
 221  */
 222 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 223 {
 224         kfree(rt2x00dev->rf);
 225         rt2x00dev->rf = NULL;
 226
 227         kfree(rt2x00dev->eeprom);
 228         rt2x00dev->eeprom = NULL;
 229
 230         if (rt2x00dev->csr.base) {
 231                 iounmap(rt2x00dev->csr.base);
 232                 rt2x00dev->csr.base = NULL;
 233         }
 234 }
 235
 236 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 237 {
 238         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 239
 240         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 241         if (!rt2x00dev->csr.base)
 242                 goto exit;
 243
 244         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 245         if (!rt2x00dev->eeprom)
 246                 goto exit;
 247
 248         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 249         if (!rt2x00dev->rf)
 250                 goto exit;
 251
 252         return 0;
 253
 254 exit:
 255         ERROR_PROBE("Failed to allocate registers.\n");
 256
 257         rt2x00pci_free_reg(rt2x00dev);
 258
 259         return -ENOMEM;
 260 }
 261
 262 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 263 {
 264         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 265         struct ieee80211_hw *hw;
 266         struct rt2x00_dev *rt2x00dev;
 267         int retval;
 268
 269         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 270         if (retval) {
 271                 ERROR_PROBE("PCI request regions failed.\n");
 272                 return retval;
 273         }
 274
 275         retval = pci_enable_device(pci_dev);
 276         if (retval) {
 277                 ERROR_PROBE("Enable device failed.\n");
 278                 goto exit_release_regions;
 279         }
 280
 281         pci_set_master(pci_dev);
 282
 283         if (pci_set_mwi(pci_dev))
 284                 ERROR_PROBE("MWI not available.\n");
 285
 286         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 287                 ERROR_PROBE("PCI DMA not supported.\n");
 288                 retval = -EIO;
 289                 goto exit_disable_device;
 290         }
 291
 292         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 293         if (!hw) {
 294                 ERROR_PROBE("Failed to allocate hardware.\n");
 295                 retval = -ENOMEM;
 296                 goto exit_disable_device;
 297         }
 298
 299         pci_set_drvdata(pci_dev, hw);
 300
 301         rt2x00dev = hw->priv;
 302         rt2x00dev->dev = &pci_dev->dev;
 303         rt2x00dev->ops = ops;
 304         rt2x00dev->hw = hw;
 305         rt2x00dev->irq = pci_dev->irq;
 306         rt2x00dev->name = pci_name(pci_dev);
 307
 308         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 309
 310         retval = rt2x00pci_alloc_reg(rt2x00dev);
 311         if (retval)
 312                 goto exit_free_device;
 313
 314         retval = rt2x00lib_probe_dev(rt2x00dev);
 315         if (retval)
 316                 goto exit_free_reg;
 317
 318         return 0;
 319
 320 exit_free_reg:
 321         rt2x00pci_free_reg(rt2x00dev);
 322
 323 exit_free_device:
 324         ieee80211_free_hw(hw);
 325
 326 exit_disable_device:
 327         if (retval != -EBUSY)
 328                 pci_disable_device(pci_dev);
 329
 330 exit_release_regions:
 331         pci_release_regions(pci_dev);
 332
 333         pci_set_drvdata(pci_dev, NULL);
 334
 335         return retval;
 336 }
 337 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 338
 339 void rt2x00pci_remove(struct pci_dev *pci_dev)
 340 {
 341         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 342         struct rt2x00_dev *rt2x00dev = hw->priv;
 343
 344         /*
 345          * Free all allocated data.
 346          */
 347         rt2x00lib_remove_dev(rt2x00dev);
 348         rt2x00pci_free_reg(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         pci_save_state(pci_dev);
 372         pci_disable_device(pci_dev);
 373         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 374 }
 375 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 376
 377 int rt2x00pci_resume(struct pci_dev *pci_dev)
 378 {
 379         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 380         struct rt2x00_dev *rt2x00dev = hw->priv;
 381
 382         if (pci_set_power_state(pci_dev, PCI_D0) ||
 383             pci_enable_device(pci_dev) ||
 384             pci_restore_state(pci_dev)) {
 385                 ERROR(rt2x00dev, "Failed to resume device.\n");
 386                 return -EIO;
 387         }
 388
 389         return rt2x00lib_resume(rt2x00dev);
 390 }
 391 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 392 #endif /* CONFIG_PM */
 393
 394 /*
 395  * rt2x00pci module information.
 396  */
 397 MODULE_AUTHOR(DRV_PROJECT);
 398 MODULE_VERSION(DRV_VERSION);
 399 MODULE_DESCRIPTION("rt2x00 pci library");
 400 MODULE_LICENSE("GPL");