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, GFP_ATOMIC);
  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 | __GFP_ZERO);
 128         if (!addr)
 129                 return -ENOMEM;
 130
 131         /*
 132          * Initialize all queue entries to contain valid addresses.
 133          */
 134         for (i = 0; i < queue->limit; i++) {
 135                 entry_priv = queue->entries[i].priv_data;
 136                 entry_priv->desc = addr + i * queue->desc_size;
 137                 entry_priv->desc_dma = dma + i * queue->desc_size;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static void rt2x00pci_free_queue_dma(struct rt2x00_dev *rt2x00dev,
 144                                      struct data_queue *queue)
 145 {
 146         struct queue_entry_priv_pci *entry_priv =
 147             queue->entries[0].priv_data;
 148
 149         if (entry_priv->desc)
 150                 dma_free_coherent(rt2x00dev->dev,
 151                                   queue->limit * queue->desc_size,
 152                                   entry_priv->desc, entry_priv->desc_dma);
 153         entry_priv->desc = NULL;
 154 }
 155
 156 int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
 157 {
 158         struct data_queue *queue;
 159         int status;
 160
 161         /*
 162          * Allocate DMA
 163          */
 164         queue_for_each(rt2x00dev, queue) {
 165                 status = rt2x00pci_alloc_queue_dma(rt2x00dev, queue);
 166                 if (status)
 167                         goto exit;
 168         }
 169
 170         /*
 171          * Register interrupt handler.
 172          */
 173         status = request_irq(rt2x00dev->irq,
 174                              rt2x00dev->ops->lib->irq_handler,
 175                              IRQF_SHARED, rt2x00dev->name, rt2x00dev);
 176         if (status) {
 177                 ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
 178                       rt2x00dev->irq, status);
 179                 goto exit;
 180         }
 181
 182         return 0;
 183
 184 exit:
 185         queue_for_each(rt2x00dev, queue)
 186                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 187
 188         return status;
 189 }
 190 EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
 191
 192 void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
 193 {
 194         struct data_queue *queue;
 195
 196         /*
 197          * Free irq line.
 198          */
 199         free_irq(rt2x00dev->irq, rt2x00dev);
 200
 201         /*
 202          * Free DMA
 203          */
 204         queue_for_each(rt2x00dev, queue)
 205                 rt2x00pci_free_queue_dma(rt2x00dev, queue);
 206 }
 207 EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
 208
 209 /*
 210  * PCI driver handlers.
 211  */
 212 static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
 213 {
 214         kfree(rt2x00dev->rf);
 215         rt2x00dev->rf = NULL;
 216
 217         kfree(rt2x00dev->eeprom);
 218         rt2x00dev->eeprom = NULL;
 219
 220         if (rt2x00dev->csr.base) {
 221                 iounmap(rt2x00dev->csr.base);
 222                 rt2x00dev->csr.base = NULL;
 223         }
 224 }
 225
 226 static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
 227 {
 228         struct pci_dev *pci_dev = to_pci_dev(rt2x00dev->dev);
 229
 230         rt2x00dev->csr.base = pci_ioremap_bar(pci_dev, 0);
 231         if (!rt2x00dev->csr.base)
 232                 goto exit;
 233
 234         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
 235         if (!rt2x00dev->eeprom)
 236                 goto exit;
 237
 238         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
 239         if (!rt2x00dev->rf)
 240                 goto exit;
 241
 242         return 0;
 243
 244 exit:
 245         ERROR_PROBE("Failed to allocate registers.\n");
 246
 247         rt2x00pci_free_reg(rt2x00dev);
 248
 249         return -ENOMEM;
 250 }
 251
 252 int rt2x00pci_probe(struct pci_dev *pci_dev, const struct rt2x00_ops *ops)
 253 {
 254         struct ieee80211_hw *hw;
 255         struct rt2x00_dev *rt2x00dev;
 256         int retval;
 257         u16 chip;
 258
 259         retval = pci_enable_device(pci_dev);
 260         if (retval) {
 261                 ERROR_PROBE("Enable device failed.\n");
 262                 return retval;
 263         }
 264
 265         retval = pci_request_regions(pci_dev, pci_name(pci_dev));
 266         if (retval) {
 267                 ERROR_PROBE("PCI request regions failed.\n");
 268                 goto exit_disable_device;
 269         }
 270
 271         pci_set_master(pci_dev);
 272
 273         if (pci_set_mwi(pci_dev))
 274                 ERROR_PROBE("MWI not available.\n");
 275
 276         if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
 277                 ERROR_PROBE("PCI DMA not supported.\n");
 278                 retval = -EIO;
 279                 goto exit_release_regions;
 280         }
 281
 282         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
 283         if (!hw) {
 284                 ERROR_PROBE("Failed to allocate hardware.\n");
 285                 retval = -ENOMEM;
 286                 goto exit_release_regions;
 287         }
 288
 289         pci_set_drvdata(pci_dev, hw);
 290
 291         rt2x00dev = hw->priv;
 292         rt2x00dev->dev = &pci_dev->dev;
 293         rt2x00dev->ops = ops;
 294         rt2x00dev->hw = hw;
 295         rt2x00dev->irq = pci_dev->irq;
 296         rt2x00dev->name = pci_name(pci_dev);
 297
 298         if (pci_is_pcie(pci_dev))
 299                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCIE);
 300         else
 301                 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_PCI);
 302
 303         retval = rt2x00pci_alloc_reg(rt2x00dev);
 304         if (retval)
 305                 goto exit_free_device;
 306
 307         /*
 308          * Because rt3290 chip use different efuse offset to read efuse data.
 309          * So before read efuse it need to indicate it is the
 310          * rt3290 or not.
 311          */
 312         pci_read_config_word(pci_dev, PCI_DEVICE_ID, &chip);
 313         rt2x00dev->chip.rt = chip;
 314
 315         retval = rt2x00lib_probe_dev(rt2x00dev);
 316         if (retval)
 317                 goto exit_free_reg;
 318
 319         return 0;
 320
 321 exit_free_reg:
 322         rt2x00pci_free_reg(rt2x00dev);
 323
 324 exit_free_device:
 325         ieee80211_free_hw(hw);
 326
 327 exit_release_regions:
 328         pci_release_regions(pci_dev);
 329
 330 exit_disable_device:
 331         pci_disable_device(pci_dev);
 332
 333         pci_set_drvdata(pci_dev, NULL);
 334
 335         return retval;
 336 }
 337 EXPORT_SYMBOL_GPL(rt2x00pci_probe);
 338
 339 void rt2x00pci_remove(struct pci_dev *pci_dev)
 340 {
 341         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 342         struct rt2x00_dev *rt2x00dev = hw->priv;
 343
 344         /*
 345          * Free all allocated data.
 346          */
 347         rt2x00lib_remove_dev(rt2x00dev);
 348         rt2x00pci_free_reg(rt2x00dev);
 349         ieee80211_free_hw(hw);
 350
 351         /*
 352          * Free the PCI device data.
 353          */
 354         pci_set_drvdata(pci_dev, NULL);
 355         pci_disable_device(pci_dev);
 356         pci_release_regions(pci_dev);
 357 }
 358 EXPORT_SYMBOL_GPL(rt2x00pci_remove);
 359
 360 #ifdef CONFIG_PM
 361 int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
 362 {
 363         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 364         struct rt2x00_dev *rt2x00dev = hw->priv;
 365         int retval;
 366
 367         retval = rt2x00lib_suspend(rt2x00dev, state);
 368         if (retval)
 369                 return retval;
 370
 371         pci_save_state(pci_dev);
 372         pci_disable_device(pci_dev);
 373         return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
 374 }
 375 EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
 376
 377 int rt2x00pci_resume(struct pci_dev *pci_dev)
 378 {
 379         struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
 380         struct rt2x00_dev *rt2x00dev = hw->priv;
 381
 382         if (pci_set_power_state(pci_dev, PCI_D0) ||
 383             pci_enable_device(pci_dev)) {
 384                 ERROR(rt2x00dev, "Failed to resume device.\n");
 385                 return -EIO;
 386         }
 387
 388         pci_restore_state(pci_dev);
 389         return rt2x00lib_resume(rt2x00dev);
 390 }
 391 EXPORT_SYMBOL_GPL(rt2x00pci_resume);
 392 #endif /* CONFIG_PM */
 393
 394 /*
 395  * rt2x00pci module information.
 396  */
 397 MODULE_AUTHOR(DRV_PROJECT);
 398 MODULE_VERSION(DRV_VERSION);
 399 MODULE_DESCRIPTION("rt2x00 pci library");
 400 MODULE_LICENSE("GPL");