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 bool 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         int max_rx = 16;
  70
  71         while (--max_rx) {
  72                 entry = rt2x00queue_get_entry(queue, Q_INDEX);
  73                 entry_priv = entry->priv_data;
  74
  75                 if (rt2x00dev->ops->lib->get_entry_state(entry))
  76                         break;
  77
  78                 /*
  79                  * Fill in desc fields of the skb descriptor
  80                  */
  81                 skbdesc = get_skb_frame_desc(entry->skb);
  82                 skbdesc->desc = entry_priv->desc;
  83                 skbdesc->desc_len = entry->queue->desc_size;
  84
  85                 /*
  86                  * DMA is already done, notify rt2x00lib that
  87                  * it finished successfully.
  88                  */
  89                 rt2x00lib_dmastart(entry);
  90                 rt2x00lib_dmadone(entry);
  91
  92                 /*
  93                  * Send the frame to rt2x00lib for further processing.
  94                  */
  95                 rt2x00lib_rxdone(entry);
  96         }
  97
  98         return !max_rx;
  99 }
 100 EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
 101
 102 void rt2x00pci_flush_queue(struct data_queue *queue, bool drop)
 103 {
 104         unsigned int i;
 105
 106         for (i = 0; !rt2x00queue_empty(queue) && i < 10; i++)
 107                 msleep(10);
 108 }
 109 EXPORT_SYMBOL_GPL(rt2x00pci_flush_queue);
 110
 111 /*
 112  * Device initialization handlers.
 113  */
 114 static int rt2x00pci_alloc_queue_dma(struct rt2x00_dev *rt2x00dev,
 115                                      struct data_queue *queue)
 116 {
 117         struct queue_entry_priv_pci *entry_priv;
 118         void *addr;
 119         dma_addr_t dma;
 120         unsigned int i;
 121
 122         /*
 123          * Allocate DMA memory for descriptor and buffer.
 124          */
 125         addr = dma_alloc_coherent(rt2x00dev->dev,
 126                                   queue->limit * queue->desc_size,
 127                                   &dma, GFP_KERNEL);
 128         if (!addr)
 129                 return -ENOMEM;
 130
 131         memset(addr, 0, queue->limit * queue->desc_size);
 132
 133         /*
 134          * Initialize all queue entries to contain valid addresses.
 135          */
 136         for (i = 0; i < queue->limit; i++) {
 137                 entry_priv = queue->entries[i].priv_data;
 138                 entry_priv->desc = addr + i * queue->desc_size;
 139                 entry_priv->desc_dma = dma + i * queue->desc_size;
 140         }
 141
 142         return 0;
 143 }
 144
 145 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 146                                      struct data_queue *queue)
 147 {
 148         struct queue_entry_priv_pci *entry_priv =
 149             queue->entries[0].priv_data;
 150
 151         if (entry_priv->desc)
 152                 dma_free_coherent(rt2x00dev->dev,
 153                                   queue->limit * queue->desc_size,
 154                                   entry_priv->desc, entry_priv->desc_dma);
 155         entry_priv->desc = NULL;
 156 }
 157
 158 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 159 {
 160         struct data_queue *queue;
 161         int status;
 162
 163         /*
 164          * Allocate DMA
 165          */
 166         queue_for_each(rt2x00dev, queue) {
 167                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 168                 if (status)
 169                         goto exit;
 170         }
 171
 172         /*
 173          * Register interrupt handler.
 174          */
 175         status = request_irq(rt2x00dev->irq,
 176                              rt2x00dev->ops->lib->irq_handler,
 177                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 178         if (status) {
 179                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 180                       rt2x00dev->irq, status);
 181                 goto exit;
 182         }
 183
 184         return 0;
 185
 186 exit:
 187         queue_for_each(rt2x00dev, queue)
 188                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 189
 190         return status;
 191 }
 192 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 193
 194 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 195 {
 196         struct data_queue *queue;
 197
 198         /*
 199          * Free irq line.
 200          */
 201         free_irq(rt2x00dev->irq, rt2x00dev);
 202
 203         /*
 204          * Free DMA
 205          */
 206         queue_for_each(rt2x00dev, queue)
 207                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 208 }
 209 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 210
 211 /*
 212  * PCI driver handlers.
 213  */
 214 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 215 {
 216         kfree(rt2x00dev->rf);
 217         rt2x00dev->rf = NULL;
 218
 219         kfree(rt2x00dev->eeprom);
 220         rt2x00dev->eeprom = NULL;
 221
 222         if (rt2x00dev->csr.base) {
 223                 iounmap(rt2x00dev->csr.base);
 224                 rt2x00dev->csr.base = NULL;
 225         }
 226 }
 227
 228 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 229 {
 230         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 231
 232         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 233         if (!rt2x00dev->csr.base)
 234                 goto exit;
 235
 236         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 237         if (!rt2x00dev->eeprom)
 238                 goto exit;
 239
 240         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 241         if (!rt2x00dev->rf)
 242                 goto exit;
 243
 244         return 0;
 245
 246 exit:
 247         ERROR_PROBE("Failed to allocate registers.\n");
 248
 249         rt2x00pci_free_reg(rt2x00dev);
 250
 251         return -ENOMEM;
 252 }
 253
 254 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct rt2x00_ops *ops)
 255 {
 256         struct ieee80211_hw *hw;
 257         struct rt2x00_dev *rt2x00dev;
 258         int retval;
 259
 260         retval = pci_enable_device(pci_dev);
 261         if (retval) {
 262                 ERROR_PROBE("Enable device failed.\n");
 263                 return retval;
 264         }
 265
 266         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 267         if (retval) {
 268                 ERROR_PROBE("PCI request regions failed.\n");
 269                 goto exit_disable_device;
 270         }
 271
 272         pci_set_master(pci_dev);
 273
 274         if (pci_set_mwi(pci_dev))
 275                 ERROR_PROBE("MWI not available.\n");
 276
 277         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 278                 ERROR_PROBE("PCI DMA not supported.\n");
 279                 retval = -EIO;
 280                 goto exit_release_regions;
 281         }
 282
 283         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 284         if (!hw) {
 285                 ERROR_PROBE("Failed to allocate hardware.\n");
 286                 retval = -ENOMEM;
 287                 goto exit_release_regions;
 288         }
 289
 290         pci_set_drvdata(pci_dev, hw);
 291
 292         rt2x00dev = hw->priv;
 293         rt2x00dev->dev = &pci_dev->dev;
 294         rt2x00dev->ops = ops;
 295         rt2x00dev->hw = hw;
 296         rt2x00dev->irq = pci_dev->irq;
 297         rt2x00dev->name = pci_name(pci_dev);
 298
 299         if (pci_is_pcie(pci_dev))
 300                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 301         else
 302                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 303
 304         retval = rt2x00pci_alloc_reg(rt2x00dev);
 305         if (retval)
 306                 goto exit_free_device;
 307
 308         retval = rt2x00lib_probe_dev(rt2x00dev);
 309         if (retval)
 310                 goto exit_free_reg;
 311
 312         return 0;
 313
 314 exit_free_reg:
 315         rt2x00pci_free_reg(rt2x00dev);
 316
 317 exit_free_device:
 318         ieee80211_free_hw(hw);
 319
 320 exit_release_regions:
 321         pci_release_regions(pci_dev);
 322
 323 exit_disable_device:
 324         pci_disable_device(pci_dev);
 325
 326         pci_set_drvdata(pci_dev, NULL);
 327
 328         return retval;
 329 }
 330 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 331
 332 void rt2x00pci_remove(struct pci_dev *pci_dev)
 333 {
 334         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 335         struct rt2x00_dev *rt2x00dev = hw->priv;
 336
 337         /*
 338          * Free all allocated data.
 339          */
 340         rt2x00lib_remove_dev(rt2x00dev);
 341         rt2x00pci_free_reg(rt2x00dev);
 342         ieee80211_free_hw(hw);
 343
 344         /*
 345          * Free the PCI device data.
 346          */
 347         pci_set_drvdata(pci_dev, NULL);
 348         pci_disable_device(pci_dev);
 349         pci_release_regions(pci_dev);
 350 }
 351 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 352
 353 #ifdef CONFIG_PM
 354 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 355 {
 356         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 357         struct rt2x00_dev *rt2x00dev = hw->priv;
 358         int retval;
 359
 360         retval = rt2x00lib_suspend(rt2x00dev, state);
 361         if (retval)
 362                 return retval;
 363
 364         pci_save_state(pci_dev);
 365         pci_disable_device(pci_dev);
 366         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 367 }
 368 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 369
 370 int rt2x00pci_resume(struct pci_dev *pci_dev)
 371 {
 372         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 373         struct rt2x00_dev *rt2x00dev = hw->priv;
 374
 375         if (pci_set_power_state(pci_dev, PCI_D0) ||
 376             pci_enable_device(pci_dev)) {
 377                 ERROR(rt2x00dev, "Failed to resume device.\n");
 378                 return -EIO;
 379         }
 380
 381         pci_restore_state(pci_dev);
 382         return rt2x00lib_resume(rt2x00dev);
 383 }
 384 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 385 #endif /* CONFIG_PM */
 386
 387 /*
 388  * rt2x00pci module information.
 389  */
 390 MODULE_AUTHOR(DRV_PROJECT);
 391 MODULE_VERSION(DRV_VERSION);
 392 MODULE_DESCRIPTION("rt2x00 pci library");
 393 MODULE_LICENSE("GPL");