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 void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
  64 {
  65         struct data_queue *queue = rt2x00dev->rx;
  66         struct queue_entry *entry;
  67         struct queue_entry_priv_pci *entry_priv;
  68         struct skb_frame_desc *skbdesc;
  69
  70         while (1) {
  71                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  72                 entry_priv = entry->priv_data;
  73
  74                 if (rt2x00dev->ops->lib->get_entry_state(entry))
  75                         break;
  76
  77                 /*
  78                  * Fill in desc fields of the skb descriptor
  79                  */
  80                 skbdesc = get_skb_frame_desc(entry->skb);
  81                 skbdesc->desc = entry_priv->desc;
  82                 skbdesc->desc_len = entry->queue->desc_size;
  83
  84                 /*
  85                  * DMA is already done, notify rt2x00lib that
  86                  * it finished successfully.
  87                  */
  88                 rt2x00lib_dmastart(entry);
  89                 rt2x00lib_dmadone(entry);
  90
  91                 /*
  92                  * Send the frame to rt2x00lib for further processing.
  93                  */
  94                 rt2x00lib_rxdone(entry);
  95         }
  96 }
  97 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
  98
  99 /*
 100  * Device initialization handlers.
 101  */
 102 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 103                                      struct data_queue *queue)
 104 {
 105         struct queue_entry_priv_pci *entry_priv;
 106         void *addr;
 107         dma_addr_t dma;
 108         unsigned int i;
 109
 110         /*
 111          * Allocate DMA memory for descriptor and buffer.
 112          */
 113         addr = dma_alloc_coherent(rt2x00dev->dev,
 114                                   queue->limit * queue->desc_size,
 115                                   &dma, GFP_KERNEL);
 116         if (!addr)
 117                 return -ENOMEM;
 118
 119         memset(addr, 0, queue->limit * queue->desc_size);
 120
 121         /*
 122          * Initialize all queue entries to contain valid addresses.
 123          */
 124         for (i = 0; i < queue->limit; i++) {
 125                 entry_priv = queue->entries[i].priv_data;
 126                 entry_priv->desc = addr + i * queue->desc_size;
 127                 entry_priv->desc_dma = dma + i * queue->desc_size;
 128         }
 129
 130         return 0;
 131 }
 132
 133 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 134                                      struct data_queue *queue)
 135 {
 136         struct queue_entry_priv_pci *entry_priv =
 137             queue->entries[0].priv_data;
 138
 139         if (entry_priv->desc)
 140                 dma_free_coherent(rt2x00dev->dev,
 141                                   queue->limit * queue->desc_size,
 142                                   entry_priv->desc, entry_priv->desc_dma);
 143         entry_priv->desc = NULL;
 144 }
 145
 146 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 147 {
 148         struct data_queue *queue;
 149         int status;
 150
 151         /*
 152          * Allocate DMA
 153          */
 154         queue_for_each(rt2x00dev, queue) {
 155                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 156                 if (status)
 157                         goto exit;
 158         }
 159
 160         /*
 161          * Register interrupt handler.
 162          */
 163         status = request_threaded_irq(rt2x00dev->irq,
 164                                       rt2x00dev->ops->lib->irq_handler,
 165                                       rt2x00dev->ops->lib->irq_handler_thread,
 166                                       IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 167         if (status) {
 168                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 169                       rt2x00dev->irq, status);
 170                 goto exit;
 171         }
 172
 173         return 0;
 174
 175 exit:
 176         queue_for_each(rt2x00dev, queue)
 177                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 178
 179         return status;
 180 }
 181 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 182
 183 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 184 {
 185         struct data_queue *queue;
 186
 187         /*
 188          * Free irq line.
 189          */
 190         free_irq(rt2x00dev->irq, rt2x00dev);
 191
 192         /*
 193          * Free DMA
 194          */
 195         queue_for_each(rt2x00dev, queue)
 196                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 197 }
 198 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 199
 200 /*
 201  * PCI driver handlers.
 202  */
 203 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 204 {
 205         kfree(rt2x00dev->rf);
 206         rt2x00dev->rf = NULL;
 207
 208         kfree(rt2x00dev->eeprom);
 209         rt2x00dev->eeprom = NULL;
 210
 211         if (rt2x00dev->csr.base) {
 212                 iounmap(rt2x00dev->csr.base);
 213                 rt2x00dev->csr.base = NULL;
 214         }
 215 }
 216
 217 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 218 {
 219         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 220
 221         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 222         if (!rt2x00dev->csr.base)
 223                 goto exit;
 224
 225         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 226         if (!rt2x00dev->eeprom)
 227                 goto exit;
 228
 229         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 230         if (!rt2x00dev->rf)
 231                 goto exit;
 232
 233         return 0;
 234
 235 exit:
 236         ERROR_PROBE("Failed to allocate registers.\n");
 237
 238         rt2x00pci_free_reg(rt2x00dev);
 239
 240         return -ENOMEM;
 241 }
 242
 243 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 244 {
 245         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 246         struct ieee80211_hw *hw;
 247         struct rt2x00_dev *rt2x00dev;
 248         int retval;
 249
 250         retval = pci_enable_device(pci_dev);
 251         if (retval) {
 252                 ERROR_PROBE("Enable device failed.\n");
 253                 return retval;
 254         }
 255
 256         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 257         if (retval) {
 258                 ERROR_PROBE("PCI request regions failed.\n");
 259                 goto exit_disable_device;
 260         }
 261
 262         pci_set_master(pci_dev);
 263
 264         if (pci_set_mwi(pci_dev))
 265                 ERROR_PROBE("MWI not available.\n");
 266
 267         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 268                 ERROR_PROBE("PCI DMA not supported.\n");
 269                 retval = -EIO;
 270                 goto exit_release_regions;
 271         }
 272
 273         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 274         if (!hw) {
 275                 ERROR_PROBE("Failed to allocate hardware.\n");
 276                 retval = -ENOMEM;
 277                 goto exit_release_regions;
 278         }
 279
 280         pci_set_drvdata(pci_dev, hw);
 281
 282         rt2x00dev = hw->priv;
 283         rt2x00dev->dev = &pci_dev->dev;
 284         rt2x00dev->ops = ops;
 285         rt2x00dev->hw = hw;
 286         rt2x00dev->irq = pci_dev->irq;
 287         rt2x00dev->name = pci_name(pci_dev);
 288
 289         if (pci_is_pcie(pci_dev))
 290                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 291         else
 292                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 293
 294         retval = rt2x00pci_alloc_reg(rt2x00dev);
 295         if (retval)
 296                 goto exit_free_device;
 297
 298         retval = rt2x00lib_probe_dev(rt2x00dev);
 299         if (retval)
 300                 goto exit_free_reg;
 301
 302         return 0;
 303
 304 exit_free_reg:
 305         rt2x00pci_free_reg(rt2x00dev);
 306
 307 exit_free_device:
 308         ieee80211_free_hw(hw);
 309
 310 exit_release_regions:
 311         pci_release_regions(pci_dev);
 312
 313 exit_disable_device:
 314         pci_disable_device(pci_dev);
 315
 316         pci_set_drvdata(pci_dev, NULL);
 317
 318         return retval;
 319 }
 320 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 321
 322 void rt2x00pci_remove(struct pci_dev *pci_dev)
 323 {
 324         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 325         struct rt2x00_dev *rt2x00dev = hw->priv;
 326
 327         /*
 328          * Free all allocated data.
 329          */
 330         rt2x00lib_remove_dev(rt2x00dev);
 331         rt2x00pci_free_reg(rt2x00dev);
 332         ieee80211_free_hw(hw);
 333
 334         /*
 335          * Free the PCI device data.
 336          */
 337         pci_set_drvdata(pci_dev, NULL);
 338         pci_disable_device(pci_dev);
 339         pci_release_regions(pci_dev);
 340 }
 341 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 342
 343 #ifdef CONFIG_PM
 344 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 345 {
 346         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 347         struct rt2x00_dev *rt2x00dev = hw->priv;
 348         int retval;
 349
 350         retval = rt2x00lib_suspend(rt2x00dev, state);
 351         if (retval)
 352                 return retval;
 353
 354         pci_save_state(pci_dev);
 355         pci_disable_device(pci_dev);
 356         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 357 }
 358 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 359
 360 int rt2x00pci_resume(struct pci_dev *pci_dev)
 361 {
 362         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 363         struct rt2x00_dev *rt2x00dev = hw->priv;
 364
 365         if (pci_set_power_state(pci_dev, PCI_D0) ||
 366             pci_enable_device(pci_dev)) {
 367                 ERROR(rt2x00dev, "Failed to resume device.\n");
 368                 return -EIO;
 369         }
 370
 371         pci_restore_state(pci_dev);
 372         return rt2x00lib_resume(rt2x00dev);
 373 }
 374 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 375 #endif /* CONFIG_PM */
 376
 377 /*
 378  * rt2x00pci module information.
 379  */
 380 MODULE_AUTHOR(DRV_PROJECT);
 381 MODULE_VERSION(DRV_VERSION);
 382 MODULE_DESCRIPTION("rt2x00 pci library");
 383 MODULE_LICENSE("GPL");