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