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
  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         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
  45                 return 0;
  46
  47         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
  48                 rt2x00pci_register_read(rt2x00dev, offset, reg);
  49                 if (!rt2x00_get_field32(*reg, field))
  50                         return 1;
  51                 udelay(REGISTER_BUSY_DELAY);
  52         }
  53
  54         ERROR(rt2x00dev, "Indirect register access failed: "
  55               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
  56         *reg = ~0;
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(rt2x00pci_regbusy_read);
  61
  62 /*
  63  * TX data handlers.
  64  */
  65 int rt2x00pci_write_tx_data(struct queue_entry *entry)
  66 {
  67         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
  68         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  69         struct skb_frame_desc *skbdesc;
  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          * Fill in skb descriptor
  86          */
  87         skbdesc = get_skb_frame_desc(entry->skb);
  88         skbdesc->desc = entry_priv->desc;
  89         skbdesc->desc_len = entry->queue->desc_size;
  90
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  94
  95 /*
  96  * TX/RX data handlers.
  97  */
  98 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  99 {
 100         struct data_queue *queue = rt2x00dev->rx;
 101         struct queue_entry *entry;
 102         struct queue_entry_priv_pci *entry_priv;
 103         struct skb_frame_desc *skbdesc;
 104
 105         while (1) {
 106                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 107                 entry_priv = entry->priv_data;
 108
 109                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 110                         break;
 111
 112                 /*
 113                  * Fill in desc fields of the skb descriptor
 114                  */
 115                 skbdesc = get_skb_frame_desc(entry->skb);
 116                 skbdesc->desc = entry_priv->desc;
 117                 skbdesc->desc_len = entry->queue->desc_size;
 118
 119                 /*
 120                  * Send the frame to rt2x00lib for further processing.
 121                  */
 122                 rt2x00lib_rxdone(rt2x00dev, entry);
 123         }
 124 }
 125 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 126
 127 /*
 128  * Device initialization handlers.
 129  */
 130 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 131                                      struct data_queue *queue)
 132 {
 133         struct queue_entry_priv_pci *entry_priv;
 134         void *addr;
 135         dma_addr_t dma;
 136         unsigned int i;
 137
 138         /*
 139          * Allocate DMA memory for descriptor and buffer.
 140          */
 141         addr = dma_alloc_coherent(rt2x00dev->dev,
 142                                   queue->limit * queue->desc_size,
 143                                   &dma, GFP_KERNEL | GFP_DMA);
 144         if (!addr)
 145                 return -ENOMEM;
 146
 147         memset(addr, 0, queue->limit * queue->desc_size);
 148
 149         /*
 150          * Initialize all queue entries to contain valid addresses.
 151          */
 152         for (i = 0; i < queue->limit; i++) {
 153                 entry_priv = queue->entries[i].priv_data;
 154                 entry_priv->desc = addr + i * queue->desc_size;
 155                 entry_priv->desc_dma = dma + i * queue->desc_size;
 156         }
 157
 158         return 0;
 159 }
 160
 161 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 162                                      struct data_queue *queue)
 163 {
 164         struct queue_entry_priv_pci *entry_priv =
 165             queue->entries[0].priv_data;
 166
 167         if (entry_priv->desc)
 168                 dma_free_coherent(rt2x00dev->dev,
 169                                   queue->limit * queue->desc_size,
 170                                   entry_priv->desc, entry_priv->desc_dma);
 171         entry_priv->desc = NULL;
 172 }
 173
 174 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 175 {
 176         struct data_queue *queue;
 177         int status;
 178
 179         /*
 180          * Allocate DMA
 181          */
 182         queue_for_each(rt2x00dev, queue) {
 183                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 184                 if (status)
 185                         goto exit;
 186         }
 187
 188         /*
 189          * Register interrupt handler.
 190          */
 191         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 192                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 193         if (status) {
 194                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 195                       rt2x00dev->irq, status);
 196                 goto exit;
 197         }
 198
 199         return 0;
 200
 201 exit:
 202         queue_for_each(rt2x00dev, queue)
 203                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 204
 205         return status;
 206 }
 207 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 208
 209 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 210 {
 211         struct data_queue *queue;
 212
 213         /*
 214          * Free irq line.
 215          */
 216         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 217
 218         /*
 219          * Free DMA
 220          */
 221         queue_for_each(rt2x00dev, queue)
 222                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 223 }
 224 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 225
 226 /*
 227  * PCI driver handlers.
 228  */
 229 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 230 {
 231         kfree(rt2x00dev->rf);
 232         rt2x00dev->rf = NULL;
 233
 234         kfree(rt2x00dev->eeprom);
 235         rt2x00dev->eeprom = NULL;
 236
 237         if (rt2x00dev->csr.base) {
 238                 iounmap(rt2x00dev->csr.base);
 239                 rt2x00dev->csr.base = NULL;
 240         }
 241 }
 242
 243 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 244 {
 245         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 246
 247         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 248         if (!rt2x00dev->csr.base)
 249                 goto exit;
 250
 251         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 252         if (!rt2x00dev->eeprom)
 253                 goto exit;
 254
 255         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 256         if (!rt2x00dev->rf)
 257                 goto exit;
 258
 259         return 0;
 260
 261 exit:
 262         ERROR_PROBE("Failed to allocate registers.\n");
 263
 264         rt2x00pci_free_reg(rt2x00dev);
 265
 266         return -ENOMEM;
 267 }
 268
 269 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 270 {
 271         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 272         struct ieee80211_hw *hw;
 273         struct rt2x00_dev *rt2x00dev;
 274         int retval;
 275
 276         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 277         if (retval) {
 278                 ERROR_PROBE("PCI request regions failed.\n");
 279                 return retval;
 280         }
 281
 282         retval = pci_enable_device(pci_dev);
 283         if (retval) {
 284                 ERROR_PROBE("Enable device failed.\n");
 285                 goto exit_release_regions;
 286         }
 287
 288         pci_set_master(pci_dev);
 289
 290         if (pci_set_mwi(pci_dev))
 291                 ERROR_PROBE("MWI not available.\n");
 292
 293         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 294                 ERROR_PROBE("PCI DMA not supported.\n");
 295                 retval = -EIO;
 296                 goto exit_disable_device;
 297         }
 298
 299         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 300         if (!hw) {
 301                 ERROR_PROBE("Failed to allocate hardware.\n");
 302                 retval = -ENOMEM;
 303                 goto exit_disable_device;
 304         }
 305
 306         pci_set_drvdata(pci_dev, hw);
 307
 308         rt2x00dev = hw->priv;
 309         rt2x00dev->dev = &pci_dev->dev;
 310         rt2x00dev->ops = ops;
 311         rt2x00dev->hw = hw;
 312         rt2x00dev->irq = pci_dev->irq;
 313         rt2x00dev->name = pci_name(pci_dev);
 314
 315         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 316
 317         retval = rt2x00pci_alloc_reg(rt2x00dev);
 318         if (retval)
 319                 goto exit_free_device;
 320
 321         retval = rt2x00lib_probe_dev(rt2x00dev);
 322         if (retval)
 323                 goto exit_free_reg;
 324
 325         return 0;
 326
 327 exit_free_reg:
 328         rt2x00pci_free_reg(rt2x00dev);
 329
 330 exit_free_device:
 331         ieee80211_free_hw(hw);
 332
 333 exit_disable_device:
 334         if (retval != -EBUSY)
 335                 pci_disable_device(pci_dev);
 336
 337 exit_release_regions:
 338         pci_release_regions(pci_dev);
 339
 340         pci_set_drvdata(pci_dev, NULL);
 341
 342         return retval;
 343 }
 344 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 345
 346 void rt2x00pci_remove(struct pci_dev *pci_dev)
 347 {
 348         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 349         struct rt2x00_dev *rt2x00dev = hw->priv;
 350
 351         /*
 352          * Free all allocated data.
 353          */
 354         rt2x00lib_remove_dev(rt2x00dev);
 355         rt2x00pci_free_reg(rt2x00dev);
 356         ieee80211_free_hw(hw);
 357
 358         /*
 359          * Free the PCI device data.
 360          */
 361         pci_set_drvdata(pci_dev, NULL);
 362         pci_disable_device(pci_dev);
 363         pci_release_regions(pci_dev);
 364 }
 365 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 366
 367 #ifdef CONFIG_PM
 368 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 369 {
 370         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 371         struct rt2x00_dev *rt2x00dev = hw->priv;
 372         int retval;
 373
 374         retval = rt2x00lib_suspend(rt2x00dev, state);
 375         if (retval)
 376                 return retval;
 377
 378         pci_save_state(pci_dev);
 379         pci_disable_device(pci_dev);
 380         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 381 }
 382 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 383
 384 int rt2x00pci_resume(struct pci_dev *pci_dev)
 385 {
 386         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 387         struct rt2x00_dev *rt2x00dev = hw->priv;
 388
 389         if (pci_set_power_state(pci_dev, PCI_D0) ||
 390             pci_enable_device(pci_dev) ||
 391             pci_restore_state(pci_dev)) {
 392                 ERROR(rt2x00dev, "Failed to resume device.\n");
 393                 return -EIO;
 394         }
 395
 396         return rt2x00lib_resume(rt2x00dev);
 397 }
 398 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 399 #endif /* CONFIG_PM */
 400
 401 /*
 402  * rt2x00pci module information.
 403  */
 404 MODULE_AUTHOR(DRV_PROJECT);
 405 MODULE_VERSION(DRV_VERSION);
 406 MODULE_DESCRIPTION("rt2x00 pci library");
 407 MODULE_LICENSE("GPL");