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 {
  68         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
  69         struct queue_entry_priv_pci *entry_priv = entry->priv_data;
  70         struct skb_frame_desc *skbdesc;
  71
  72         /*
  73          * This should not happen, we already checked the entry
  74          * was ours. When the hardware disagrees there has been
  75          * a queue corruption!
  76          */
  77         if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
  78                 ERROR(rt2x00dev,
  79                       "Corrupt queue %d, accessing entry which is not ours.\n"
  80                       "Please file bug report to %s.\n",
  81                       entry->queue->qid, DRV_PROJECT);
  82                 return -EINVAL;
  83         }
  84
  85         /*
  86          * Fill in skb descriptor
  87          */
  88         skbdesc = get_skb_frame_desc(entry->skb);
  89         skbdesc->desc = entry_priv->desc;
  90         skbdesc->desc_len = entry->queue->desc_size;
  91
  92         return 0;
  93 }
  94 EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
  95
  96 /*
  97  * TX/RX data handlers.
  98  */
  99 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 100 {
 101         struct data_queue *queue = rt2x00dev->rx;
 102         struct queue_entry *entry;
 103         struct queue_entry_priv_pci *entry_priv;
 104         struct skb_frame_desc *skbdesc;
 105
 106         while (1) {
 107                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
 108                 entry_priv = entry->priv_data;
 109
 110                 if (rt2x00dev->ops->lib->get_entry_state(entry))
 111                         break;
 112
 113                 /*
 114                  * Fill in desc fields of the skb descriptor
 115                  */
 116                 skbdesc = get_skb_frame_desc(entry->skb);
 117                 skbdesc->desc = entry_priv->desc;
 118                 skbdesc->desc_len = entry->queue->desc_size;
 119
 120                 /*
 121                  * Send the frame to rt2x00lib for further processing.
 122                  */
 123                 rt2x00lib_rxdone(rt2x00dev, entry);
 124         }
 125 }
 126 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 127
 128 /*
 129  * Device initialization handlers.
 130  */
 131 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 132                                      struct data_queue *queue)
 133 {
 134         struct queue_entry_priv_pci *entry_priv;
 135         void *addr;
 136         dma_addr_t dma;
 137         unsigned int i;
 138
 139         /*
 140          * Allocate DMA memory for descriptor and buffer.
 141          */
 142         addr = dma_alloc_coherent(rt2x00dev->dev,
 143                                   queue->limit * queue->desc_size,
 144                                   &dma, GFP_KERNEL | GFP_DMA);
 145         if (!addr)
 146                 return -ENOMEM;
 147
 148         memset(addr, 0, queue->limit * queue->desc_size);
 149
 150         /*
 151          * Initialize all queue entries to contain valid addresses.
 152          */
 153         for (i = 0; i < queue->limit; i++) {
 154                 entry_priv = queue->entries[i].priv_data;
 155                 entry_priv->desc = addr + i * queue->desc_size;
 156                 entry_priv->desc_dma = dma + i * queue->desc_size;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 163                                      struct data_queue *queue)
 164 {
 165         struct queue_entry_priv_pci *entry_priv =
 166             queue->entries[0].priv_data;
 167
 168         if (entry_priv->desc)
 169                 dma_free_coherent(rt2x00dev->dev,
 170                                   queue->limit * queue->desc_size,
 171                                   entry_priv->desc, entry_priv->desc_dma);
 172         entry_priv->desc = NULL;
 173 }
 174
 175 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 176 {
 177         struct data_queue *queue;
 178         int status;
 179
 180         /*
 181          * Allocate DMA
 182          */
 183         queue_for_each(rt2x00dev, queue) {
 184                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 185                 if (status)
 186                         goto exit;
 187         }
 188
 189         /*
 190          * Register interrupt handler.
 191          */
 192         status = request_irq(rt2x00dev->irq, rt2x00dev->ops->lib->irq_handler,
 193                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 194         if (status) {
 195                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 196                       rt2x00dev->irq, status);
 197                 goto exit;
 198         }
 199
 200         return 0;
 201
 202 exit:
 203         queue_for_each(rt2x00dev, queue)
 204                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 205
 206         return status;
 207 }
 208 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 209
 210 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 211 {
 212         struct data_queue *queue;
 213
 214         /*
 215          * Free irq line.
 216          */
 217         free_irq(to_pci_dev(rt2x00dev->dev)->irq, rt2x00dev);
 218
 219         /*
 220          * Free DMA
 221          */
 222         queue_for_each(rt2x00dev, queue)
 223                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 224 }
 225 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 226
 227 /*
 228  * PCI driver handlers.
 229  */
 230 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 231 {
 232         kfree(rt2x00dev->rf);
 233         rt2x00dev->rf = NULL;
 234
 235         kfree(rt2x00dev->eeprom);
 236         rt2x00dev->eeprom = NULL;
 237
 238         if (rt2x00dev->csr.base) {
 239                 iounmap(rt2x00dev->csr.base);
 240                 rt2x00dev->csr.base = NULL;
 241         }
 242 }
 243
 244 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 245 {
 246         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 247
 248         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 249         if (!rt2x00dev->csr.base)
 250                 goto exit;
 251
 252         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 253         if (!rt2x00dev->eeprom)
 254                 goto exit;
 255
 256         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 257         if (!rt2x00dev->rf)
 258                 goto exit;
 259
 260         return 0;
 261
 262 exit:
 263         ERROR_PROBE("Failed to allocate registers.\n");
 264
 265         rt2x00pci_free_reg(rt2x00dev);
 266
 267         return -ENOMEM;
 268 }
 269
 270 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 271 {
 272         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 273         struct ieee80211_hw *hw;
 274         struct rt2x00_dev *rt2x00dev;
 275         int retval;
 276
 277         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 278         if (retval) {
 279                 ERROR_PROBE("PCI request regions failed.\n");
 280                 return retval;
 281         }
 282
 283         retval = pci_enable_device(pci_dev);
 284         if (retval) {
 285                 ERROR_PROBE("Enable device failed.\n");
 286                 goto exit_release_regions;
 287         }
 288
 289         pci_set_master(pci_dev);
 290
 291         if (pci_set_mwi(pci_dev))
 292                 ERROR_PROBE("MWI not available.\n");
 293
 294         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 295                 ERROR_PROBE("PCI DMA not supported.\n");
 296                 retval = -EIO;
 297                 goto exit_disable_device;
 298         }
 299
 300         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 301         if (!hw) {
 302                 ERROR_PROBE("Failed to allocate hardware.\n");
 303                 retval = -ENOMEM;
 304                 goto exit_disable_device;
 305         }
 306
 307         pci_set_drvdata(pci_dev, hw);
 308
 309         rt2x00dev = hw->priv;
 310         rt2x00dev->dev = &pci_dev->dev;
 311         rt2x00dev->ops = ops;
 312         rt2x00dev->hw = hw;
 313         rt2x00dev->irq = pci_dev->irq;
 314         rt2x00dev->name = pci_name(pci_dev);
 315
 316         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 317
 318         retval = rt2x00pci_alloc_reg(rt2x00dev);
 319         if (retval)
 320                 goto exit_free_device;
 321
 322         retval = rt2x00lib_probe_dev(rt2x00dev);
 323         if (retval)
 324                 goto exit_free_reg;
 325
 326         return 0;
 327
 328 exit_free_reg:
 329         rt2x00pci_free_reg(rt2x00dev);
 330
 331 exit_free_device:
 332         ieee80211_free_hw(hw);
 333
 334 exit_disable_device:
 335         if (retval != -EBUSY)
 336                 pci_disable_device(pci_dev);
 337
 338 exit_release_regions:
 339         pci_release_regions(pci_dev);
 340
 341         pci_set_drvdata(pci_dev, NULL);
 342
 343         return retval;
 344 }
 345 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 346
 347 void rt2x00pci_remove(struct pci_dev *pci_dev)
 348 {
 349         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 350         struct rt2x00_dev *rt2x00dev = hw->priv;
 351
 352         /*
 353          * Free all allocated data.
 354          */
 355         rt2x00lib_remove_dev(rt2x00dev);
 356         rt2x00pci_free_reg(rt2x00dev);
 357         ieee80211_free_hw(hw);
 358
 359         /*
 360          * Free the PCI device data.
 361          */
 362         pci_set_drvdata(pci_dev, NULL);
 363         pci_disable_device(pci_dev);
 364         pci_release_regions(pci_dev);
 365 }
 366 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 367
 368 #ifdef CONFIG_PM
 369 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 370 {
 371         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 372         struct rt2x00_dev *rt2x00dev = hw->priv;
 373         int retval;
 374
 375         retval = rt2x00lib_suspend(rt2x00dev, state);
 376         if (retval)
 377                 return retval;
 378
 379         pci_save_state(pci_dev);
 380         pci_disable_device(pci_dev);
 381         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 382 }
 383 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 384
 385 int rt2x00pci_resume(struct pci_dev *pci_dev)
 386 {
 387         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 388         struct rt2x00_dev *rt2x00dev = hw->priv;
 389
 390         if (pci_set_power_state(pci_dev, PCI_D0) ||
 391             pci_enable_device(pci_dev) ||
 392             pci_restore_state(pci_dev)) {
 393                 ERROR(rt2x00dev, "Failed to resume device.\n");
 394                 return -EIO;
 395         }
 396
 397         return rt2x00lib_resume(rt2x00dev);
 398 }
 399 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 400 #endif /* CONFIG_PM */
 401
 402 /*
 403  * rt2x00pci module information.
 404  */
 405 MODULE_AUTHOR(DRV_PROJECT);
 406 MODULE_VERSION(DRV_VERSION);
 407 MODULE_DESCRIPTION("rt2x00 pci library");
 408 MODULE_LICENSE("GPL");