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         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  71         struct skb_frame_desc *skbdesc;
  72
  73         /*
  74          * This should not happen, we already checked the entry
  75          * was ours. When the hardware disagrees there has been
  76          * a queue corruption!
  77          */
  78         if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
  79                 ERROR(rt2x00dev,
  80                       "Corrupt queue %d, accessing entry which is not ours.\n"
  81                       "Please file bug report to %s.\n",
  82                       entry->queue->qid, DRV_PROJECT);
  83                 return -EINVAL;
  84         }
  85
  86         /*
  87          * Fill in skb descriptor
  88          */
  89         skbdesc = get_skb_frame_desc(entry->skb);
  90         skbdesc->desc = entry_priv->desc;
  91         skbdesc->desc_len = entry->queue->desc_size;
  92
  93         return 0;
  94 }
  95 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  96
  97 /*
  98  * TX/RX data handlers.
  99  */
 100 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 101 {
 102         struct data_queue *queue = rt2x00dev->rx;
 103         struct queue_entry *entry;
 104         struct queue_entry_priv_pci *entry_priv;
 105         struct skb_frame_desc *skbdesc;
 106
 107         while (1) {
 108                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 109                 entry_priv = entry->priv_data;
 110
 111                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 112                         break;
 113
 114                 /*
 115                  * Fill in desc fields of the skb descriptor
 116                  */
 117                 skbdesc = get_skb_frame_desc(entry->skb);
 118                 skbdesc->desc = entry_priv->desc;
 119                 skbdesc->desc_len = entry->queue->desc_size;
 120
 121                 /*
 122                  * Send the frame to rt2x00lib for further processing.
 123                  */
 124                 rt2x00lib_rxdone(rt2x00dev, entry);
 125         }
 126 }
 127 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 128
 129 /*
 130  * Device initialization handlers.
 131  */
 132 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 133                                      struct data_queue *queue)
 134 {
 135         struct queue_entry_priv_pci *entry_priv;
 136         void *addr;
 137         dma_addr_t dma;
 138         unsigned int i;
 139
 140         /*
 141          * Allocate DMA memory for descriptor and buffer.
 142          */
 143         addr = dma_alloc_coherent(rt2x00dev->dev,
 144                                   queue->limit * queue->desc_size,
 145                                   &dma, GFP_KERNEL | GFP_DMA);
 146         if (!addr)
 147                 return -ENOMEM;
 148
 149         memset(addr, 0, queue->limit * queue->desc_size);
 150
 151         /*
 152          * Initialize all queue entries to contain valid addresses.
 153          */
 154         for (i = 0; i < queue->limit; i++) {
 155                 entry_priv = queue->entries[i].priv_data;
 156                 entry_priv->desc = addr + i * queue->desc_size;
 157                 entry_priv->desc_dma = dma + i * queue->desc_size;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 164                                      struct data_queue *queue)
 165 {
 166         struct queue_entry_priv_pci *entry_priv =
 167             queue->entries[0].priv_data;
 168
 169         if (entry_priv->desc)
 170                 dma_free_coherent(rt2x00dev->dev,
 171                                   queue->limit * queue->desc_size,
 172                                   entry_priv->desc, entry_priv->desc_dma);
 173         entry_priv->desc = NULL;
 174 }
 175
 176 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 177 {
 178         struct data_queue *queue;
 179         int status;
 180
 181         /*
 182          * Allocate DMA
 183          */
 184         queue_for_each(rt2x00dev, queue) {
 185                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 186                 if (status)
 187                         goto exit;
 188         }
 189
 190         /*
 191          * Register interrupt handler.
 192          */
 193         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 194                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 195         if (status) {
 196                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 197                       rt2x00dev->irq, status);
 198                 goto exit;
 199         }
 200
 201         return 0;
 202
 203 exit:
 204         queue_for_each(rt2x00dev, queue)
 205                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 206
 207         return status;
 208 }
 209 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 210
 211 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 212 {
 213         struct data_queue *queue;
 214
 215         /*
 216          * Free irq line.
 217          */
 218         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 219
 220         /*
 221          * Free DMA
 222          */
 223         queue_for_each(rt2x00dev, queue)
 224                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 225 }
 226 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 227
 228 /*
 229  * PCI driver handlers.
 230  */
 231 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 232 {
 233         kfree(rt2x00dev->rf);
 234         rt2x00dev->rf = NULL;
 235
 236         kfree(rt2x00dev->eeprom);
 237         rt2x00dev->eeprom = NULL;
 238
 239         if (rt2x00dev->csr.base) {
 240                 iounmap(rt2x00dev->csr.base);
 241                 rt2x00dev->csr.base = NULL;
 242         }
 243 }
 244
 245 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 246 {
 247         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 248
 249         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 250         if (!rt2x00dev->csr.base)
 251                 goto exit;
 252
 253         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 254         if (!rt2x00dev->eeprom)
 255                 goto exit;
 256
 257         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 258         if (!rt2x00dev->rf)
 259                 goto exit;
 260
 261         return 0;
 262
 263 exit:
 264         ERROR_PROBE("Failed to allocate registers.\n");
 265
 266         rt2x00pci_free_reg(rt2x00dev);
 267
 268         return -ENOMEM;
 269 }
 270
 271 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 272 {
 273         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 274         struct ieee80211_hw *hw;
 275         struct rt2x00_dev *rt2x00dev;
 276         int retval;
 277
 278         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 279         if (retval) {
 280                 ERROR_PROBE("PCI request regions failed.\n");
 281                 return retval;
 282         }
 283
 284         retval = pci_enable_device(pci_dev);
 285         if (retval) {
 286                 ERROR_PROBE("Enable device failed.\n");
 287                 goto exit_release_regions;
 288         }
 289
 290         pci_set_master(pci_dev);
 291
 292         if (pci_set_mwi(pci_dev))
 293                 ERROR_PROBE("MWI not available.\n");
 294
 295         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 296                 ERROR_PROBE("PCI DMA not supported.\n");
 297                 retval = -EIO;
 298                 goto exit_disable_device;
 299         }
 300
 301         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 302         if (!hw) {
 303                 ERROR_PROBE("Failed to allocate hardware.\n");
 304                 retval = -ENOMEM;
 305                 goto exit_disable_device;
 306         }
 307
 308         pci_set_drvdata(pci_dev, hw);
 309
 310         rt2x00dev = hw->priv;
 311         rt2x00dev->dev = &pci_dev->dev;
 312         rt2x00dev->ops = ops;
 313         rt2x00dev->hw = hw;
 314         rt2x00dev->irq = pci_dev->irq;
 315         rt2x00dev->name = pci_name(pci_dev);
 316
 317         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 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");