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_irq(rt2x00dev->irq,
 164                              rt2x00dev->ops->lib->irq_handler,
 165                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 166         if (status) {
 167                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 168                       rt2x00dev->irq, status);
 169                 goto exit;
 170         }
 171
 172         return 0;
 173
 174 exit:
 175         queue_for_each(rt2x00dev, queue)
 176                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 177
 178         return status;
 179 }
 180 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 181
 182 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 183 {
 184         struct data_queue *queue;
 185
 186         /*
 187          * Free irq line.
 188          */
 189         free_irq(rt2x00dev->irq, rt2x00dev);
 190
 191         /*
 192          * Free DMA
 193          */
 194         queue_for_each(rt2x00dev, queue)
 195                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 196 }
 197 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 198
 199 /*
 200  * PCI driver handlers.
 201  */
 202 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 203 {
 204         kfree(rt2x00dev->rf);
 205         rt2x00dev->rf = NULL;
 206
 207         kfree(rt2x00dev->eeprom);
 208         rt2x00dev->eeprom = NULL;
 209
 210         if (rt2x00dev->csr.base) {
 211                 iounmap(rt2x00dev->csr.base);
 212                 rt2x00dev->csr.base = NULL;
 213         }
 214 }
 215
 216 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 217 {
 218         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 219
 220         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 221         if (!rt2x00dev->csr.base)
 222                 goto exit;
 223
 224         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 225         if (!rt2x00dev->eeprom)
 226                 goto exit;
 227
 228         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 229         if (!rt2x00dev->rf)
 230                 goto exit;
 231
 232         return 0;
 233
 234 exit:
 235         ERROR_PROBE("Failed to allocate registers.\n");
 236
 237         rt2x00pci_free_reg(rt2x00dev);
 238
 239         return -ENOMEM;
 240 }
 241
 242 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
 243 {
 244         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
 245         struct ieee80211_hw *hw;
 246         struct rt2x00_dev *rt2x00dev;
 247         int retval;
 248
 249         retval = pci_enable_device(pci_dev);
 250         if (retval) {
 251                 ERROR_PROBE("Enable device failed.\n");
 252                 return retval;
 253         }
 254
 255         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 256         if (retval) {
 257                 ERROR_PROBE("PCI request regions failed.\n");
 258                 goto exit_disable_device;
 259         }
 260
 261         pci_set_master(pci_dev);
 262
 263         if (pci_set_mwi(pci_dev))
 264                 ERROR_PROBE("MWI not available.\n");
 265
 266         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 267                 ERROR_PROBE("PCI DMA not supported.\n");
 268                 retval = -EIO;
 269                 goto exit_release_regions;
 270         }
 271
 272         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 273         if (!hw) {
 274                 ERROR_PROBE("Failed to allocate hardware.\n");
 275                 retval = -ENOMEM;
 276                 goto exit_release_regions;
 277         }
 278
 279         pci_set_drvdata(pci_dev, hw);
 280
 281         rt2x00dev = hw->priv;
 282         rt2x00dev->dev = &pci_dev->dev;
 283         rt2x00dev->ops = ops;
 284         rt2x00dev->hw = hw;
 285         rt2x00dev->irq = pci_dev->irq;
 286         rt2x00dev->name = pci_name(pci_dev);
 287
 288         if (pci_is_pcie(pci_dev))
 289                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 290         else
 291                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 292
 293         retval = rt2x00pci_alloc_reg(rt2x00dev);
 294         if (retval)
 295                 goto exit_free_device;
 296
 297         retval = rt2x00lib_probe_dev(rt2x00dev);
 298         if (retval)
 299                 goto exit_free_reg;
 300
 301         return 0;
 302
 303 exit_free_reg:
 304         rt2x00pci_free_reg(rt2x00dev);
 305
 306 exit_free_device:
 307         ieee80211_free_hw(hw);
 308
 309 exit_release_regions:
 310         pci_release_regions(pci_dev);
 311
 312 exit_disable_device:
 313         pci_disable_device(pci_dev);
 314
 315         pci_set_drvdata(pci_dev, NULL);
 316
 317         return retval;
 318 }
 319 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 320
 321 void rt2x00pci_remove(struct pci_dev *pci_dev)
 322 {
 323         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 324         struct rt2x00_dev *rt2x00dev = hw->priv;
 325
 326         /*
 327          * Free all allocated data.
 328          */
 329         rt2x00lib_remove_dev(rt2x00dev);
 330         rt2x00pci_free_reg(rt2x00dev);
 331         ieee80211_free_hw(hw);
 332
 333         /*
 334          * Free the PCI device data.
 335          */
 336         pci_set_drvdata(pci_dev, NULL);
 337         pci_disable_device(pci_dev);
 338         pci_release_regions(pci_dev);
 339 }
 340 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 341
 342 #ifdef CONFIG_PM
 343 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 344 {
 345         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 346         struct rt2x00_dev *rt2x00dev = hw->priv;
 347         int retval;
 348
 349         retval = rt2x00lib_suspend(rt2x00dev, state);
 350         if (retval)
 351                 return retval;
 352
 353         pci_save_state(pci_dev);
 354         pci_disable_device(pci_dev);
 355         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 356 }
 357 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 358
 359 int rt2x00pci_resume(struct pci_dev *pci_dev)
 360 {
 361         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 362         struct rt2x00_dev *rt2x00dev = hw->priv;
 363
 364         if (pci_set_power_state(pci_dev, PCI_D0) ||
 365             pci_enable_device(pci_dev)) {
 366                 ERROR(rt2x00dev, "Failed to resume device.\n");
 367                 return -EIO;
 368         }
 369
 370         pci_restore_state(pci_dev);
 371         return rt2x00lib_resume(rt2x00dev);
 372 }
 373 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 374 #endif /* CONFIG_PM */
 375
 376 /*
 377  * rt2x00pci module information.
 378  */
 379 MODULE_AUTHOR(DRV_PROJECT);
 380 MODULE_VERSION(DRV_VERSION);
 381 MODULE_DESCRIPTION("rt2x00 pci library");
 382 MODULE_LICENSE("GPL");