drivers/net/wireless/ath/ath5k/pci.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/nl80211.h>
  18 #include <linux/pci.h>
  19 #include <linux/pci-aspm.h>
  20 #include <linux/etherdevice.h>
  21 #include "../ath.h"
  22 #include "ath5k.h"
  23 #include "debug.h"
  24 #include "base.h"
  25 #include "reg.h"
  26
  27 /* Known PCI ids */
  28 static DEFINE_PCI_DEVICE_TABLE(ath5k_pci_id_table) = {
  29         { PCI_VDEVICE(ATHEROS, 0x0207) }, /* 5210 early */
  30         { PCI_VDEVICE(ATHEROS, 0x0007) }, /* 5210 */
  31         { PCI_VDEVICE(ATHEROS, 0x0011) }, /* 5311 - this is on AHB bus !*/
  32         { PCI_VDEVICE(ATHEROS, 0x0012) }, /* 5211 */
  33         { PCI_VDEVICE(ATHEROS, 0x0013) }, /* 5212 */
  34         { PCI_VDEVICE(3COM_2,  0x0013) }, /* 3com 5212 */
  35         { PCI_VDEVICE(3COM,    0x0013) }, /* 3com 3CRDAG675 5212 */
  36         { PCI_VDEVICE(ATHEROS, 0x1014) }, /* IBM minipci 5212 */
  37         { PCI_VDEVICE(ATHEROS, 0x0014) }, /* 5212 combatible */
  38         { PCI_VDEVICE(ATHEROS, 0x0015) }, /* 5212 combatible */
  39         { PCI_VDEVICE(ATHEROS, 0x0016) }, /* 5212 combatible */
  40         { PCI_VDEVICE(ATHEROS, 0x0017) }, /* 5212 combatible */
  41         { PCI_VDEVICE(ATHEROS, 0x0018) }, /* 5212 combatible */
  42         { PCI_VDEVICE(ATHEROS, 0x0019) }, /* 5212 combatible */
  43         { PCI_VDEVICE(ATHEROS, 0x001a) }, /* 2413 Griffin-lite */
  44         { PCI_VDEVICE(ATHEROS, 0x001b) }, /* 5413 Eagle */
  45         { PCI_VDEVICE(ATHEROS, 0x001c) }, /* PCI-E cards */
  46         { PCI_VDEVICE(ATHEROS, 0x001d) }, /* 2417 Nala */
  47         { 0 }
  48 };
  49 MODULE_DEVICE_TABLE(pci, ath5k_pci_id_table);
  50
  51 /* return bus cachesize in 4B word units */
  52 static void ath5k_pci_read_cachesize(struct ath_common *common, int *csz)
  53 {
  54         struct ath5k_softc *sc = (struct ath5k_softc *) common->priv;
  55         u8 u8tmp;
  56
  57         pci_read_config_byte(sc->pdev, PCI_CACHE_LINE_SIZE, &u8tmp);
  58         *csz = (int)u8tmp;
  59
  60         /*
  61          * This check was put in to avoid "unpleasant" consequences if
  62          * the bootrom has not fully initialized all PCI devices.
  63          * Sometimes the cache line size register is not set
  64          */
  65
  66         if (*csz == 0)
  67                 *csz = L1_CACHE_BYTES >> 2;   /* Use the default size */
  68 }
  69
  70 /*
  71  * Read from eeprom
  72  */
  73 static bool
  74 ath5k_pci_eeprom_read(struct ath_common *common, u32 offset, u16 *data)
  75 {
  76         struct ath5k_hw *ah = (struct ath5k_hw *) common->ah;
  77         u32 status, timeout;
  78
  79         /*
  80          * Initialize EEPROM access
  81          */
  82         if (ah->ah_version == AR5K_AR5210) {
  83                 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_EEAE);
  84                 (void)ath5k_hw_reg_read(ah, AR5K_EEPROM_BASE + (4 * offset));
  85         } else {
  86                 ath5k_hw_reg_write(ah, offset, AR5K_EEPROM_BASE);
  87                 AR5K_REG_ENABLE_BITS(ah, AR5K_EEPROM_CMD,
  88                                 AR5K_EEPROM_CMD_READ);
  89         }
  90
  91         for (timeout = AR5K_TUNE_REGISTER_TIMEOUT; timeout > 0; timeout--) {
  92                 status = ath5k_hw_reg_read(ah, AR5K_EEPROM_STATUS);
  93                 if (status & AR5K_EEPROM_STAT_RDDONE) {
  94                         if (status & AR5K_EEPROM_STAT_RDERR)
  95                                 return false;
  96                         *data = (u16)(ath5k_hw_reg_read(ah, AR5K_EEPROM_DATA) &
  97                                         0xffff);
  98                         return true;
  99                 }
 100                 udelay(15);
 101         }
 102
 103         return false;
 104 }
 105
 106 int ath5k_hw_read_srev(struct ath5k_hw *ah)
 107 {
 108         ah->ah_mac_srev = ath5k_hw_reg_read(ah, AR5K_SREV);
 109         return 0;
 110 }
 111
 112 /*
 113  * Read the MAC address from eeprom or platform_data
 114  */
 115 static int ath5k_pci_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
 116 {
 117         u8 mac_d[ETH_ALEN] = {};
 118         u32 total, offset;
 119         u16 data;
 120         int octet;
 121
 122         AR5K_EEPROM_READ(0x20, data);
 123
 124         for (offset = 0x1f, octet = 0, total = 0; offset >= 0x1d; offset--) {
 125                 AR5K_EEPROM_READ(offset, data);
 126
 127                 total += data;
 128                 mac_d[octet + 1] = data & 0xff;
 129                 mac_d[octet] = data >> 8;
 130                 octet += 2;
 131         }
 132
 133         if (!total || total == 3 * 0xffff)
 134                 return -EINVAL;
 135
 136         memcpy(mac, mac_d, ETH_ALEN);
 137
 138         return 0;
 139 }
 140
 141
 142 /* Common ath_bus_opts structure */
 143 static const struct ath_bus_ops ath_pci_bus_ops = {
 144         .ath_bus_type = ATH_PCI,
 145         .read_cachesize = ath5k_pci_read_cachesize,
 146         .eeprom_read = ath5k_pci_eeprom_read,
 147         .eeprom_read_mac = ath5k_pci_eeprom_read_mac,
 148 };
 149
 150 /********************\
 151 * PCI Initialization *
 152 \********************/
 153
 154 static int __devinit
 155 ath5k_pci_probe(struct pci_dev *pdev,
 156                 const struct pci_device_id *id)
 157 {
 158         void __iomem *mem;
 159         struct ath5k_softc *sc;
 160         struct ieee80211_hw *hw;
 161         int ret;
 162         u8 csz;
 163
 164         /*
 165          * L0s needs to be disabled on all ath5k cards.
 166          *
 167          * For distributions shipping with CONFIG_PCIEASPM (this will be enabled
 168          * by default in the future in 2.6.36) this will also mean both L1 and
 169          * L0s will be disabled when a pre 1.1 PCIe device is detected. We do
 170          * know L1 works correctly even for all ath5k pre 1.1 PCIe devices
 171          * though but cannot currently undue the effect of a blacklist, for
 172          * details you can read pcie_aspm_sanity_check() and see how it adjusts
 173          * the device link capability.
 174          *
 175          * It may be possible in the future to implement some PCI API to allow
 176          * drivers to override blacklists for pre 1.1 PCIe but for now it is
 177          * best to accept that both L0s and L1 will be disabled completely for
 178          * distributions shipping with CONFIG_PCIEASPM rather than having this
 179          * issue present. Motivation for adding this new API will be to help
 180          * with power consumption for some of these devices.
 181          */
 182         pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
 183
 184         ret = pci_enable_device(pdev);
 185         if (ret) {
 186                 dev_err(&pdev->dev, "can't enable device\n");
 187                 goto err;
 188         }
 189
 190         /* XXX 32-bit addressing only */
 191         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 192         if (ret) {
 193                 dev_err(&pdev->dev, "32-bit DMA not available\n");
 194                 goto err_dis;
 195         }
 196
 197         /*
 198          * Cache line size is used to size and align various
 199          * structures used to communicate with the hardware.
 200          */
 201         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
 202         if (csz == 0) {
 203                 /*
 204                  * Linux 2.4.18 (at least) writes the cache line size
 205                  * register as a 16-bit wide register which is wrong.
 206                  * We must have this setup properly for rx buffer
 207                  * DMA to work so force a reasonable value here if it
 208                  * comes up zero.
 209                  */
 210                 csz = L1_CACHE_BYTES >> 2;
 211                 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
 212         }
 213         /*
 214          * The default setting of latency timer yields poor results,
 215          * set it to the value used by other systems.  It may be worth
 216          * tweaking this setting more.
 217          */
 218         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8);
 219
 220         /* Enable bus mastering */
 221         pci_set_master(pdev);
 222
 223         /*
 224          * Disable the RETRY_TIMEOUT register (0x41) to keep
 225          * PCI Tx retries from interfering with C3 CPU state.
 226          */
 227         pci_write_config_byte(pdev, 0x41, 0);
 228
 229         ret = pci_request_region(pdev, 0, "ath5k");
 230         if (ret) {
 231                 dev_err(&pdev->dev, "cannot reserve PCI memory region\n");
 232                 goto err_dis;
 233         }
 234
 235         mem = pci_iomap(pdev, 0, 0);
 236         if (!mem) {
 237                 dev_err(&pdev->dev, "cannot remap PCI memory region\n") ;
 238                 ret = -EIO;
 239                 goto err_reg;
 240         }
 241
 242         /*
 243          * Allocate hw (mac80211 main struct)
 244          * and hw->priv (driver private data)
 245          */
 246         hw = ieee80211_alloc_hw(sizeof(*sc), &ath5k_hw_ops);
 247         if (hw == NULL) {
 248                 dev_err(&pdev->dev, "cannot allocate ieee80211_hw\n");
 249                 ret = -ENOMEM;
 250                 goto err_map;
 251         }
 252
 253         dev_info(&pdev->dev, "registered as '%s'\n", wiphy_name(hw->wiphy));
 254
 255         sc = hw->priv;
 256         sc->hw = hw;
 257         sc->pdev = pdev;
 258         sc->dev = &pdev->dev;
 259         sc->irq = pdev->irq;
 260         sc->devid = id->device;
 261         sc->iobase = mem; /* So we can unmap it on detach */
 262
 263         /* Initialize */
 264         ret = ath5k_init_softc(sc, &ath_pci_bus_ops);
 265         if (ret)
 266                 goto err_free;
 267
 268         /* Set private data */
 269         pci_set_drvdata(pdev, hw);
 270
 271         return 0;
 272 err_free:
 273         ieee80211_free_hw(hw);
 274 err_map:
 275         pci_iounmap(pdev, mem);
 276 err_reg:
 277         pci_release_region(pdev, 0);
 278 err_dis:
 279         pci_disable_device(pdev);
 280 err:
 281         return ret;
 282 }
 283
 284 static void __devexit
 285 ath5k_pci_remove(struct pci_dev *pdev)
 286 {
 287         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 288         struct ath5k_softc *sc = hw->priv;
 289
 290         ath5k_deinit_softc(sc);
 291         pci_iounmap(pdev, sc->iobase);
 292         pci_release_region(pdev, 0);
 293         pci_disable_device(pdev);
 294         ieee80211_free_hw(hw);
 295 }
 296
 297 #ifdef CONFIG_PM_SLEEP
 298 static int ath5k_pci_suspend(struct device *dev)
 299 {
 300         struct ath5k_softc *sc = pci_get_drvdata(to_pci_dev(dev));
 301
 302         ath5k_led_off(sc);
 303         return 0;
 304 }
 305
 306 static int ath5k_pci_resume(struct device *dev)
 307 {
 308         struct pci_dev *pdev = to_pci_dev(dev);
 309         struct ath5k_softc *sc = pci_get_drvdata(pdev);
 310
 311         /*
 312          * Suspend/Resume resets the PCI configuration space, so we have to
 313          * re-disable the RETRY_TIMEOUT register (0x41) to keep
 314          * PCI Tx retries from interfering with C3 CPU state
 315          */
 316         pci_write_config_byte(pdev, 0x41, 0);
 317
 318         ath5k_led_enable(sc);
 319         return 0;
 320 }
 321
 322 static SIMPLE_DEV_PM_OPS(ath5k_pm_ops, ath5k_pci_suspend, ath5k_pci_resume);
 323 #define ATH5K_PM_OPS    (&ath5k_pm_ops)
 324 #else
 325 #define ATH5K_PM_OPS    NULL
 326 #endif /* CONFIG_PM_SLEEP */
 327
 328 static struct pci_driver ath5k_pci_driver = {
 329         .name           = KBUILD_MODNAME,
 330         .id_table       = ath5k_pci_id_table,
 331         .probe          = ath5k_pci_probe,
 332         .remove         = __devexit_p(ath5k_pci_remove),
 333         .driver.pm      = ATH5K_PM_OPS,
 334 };
 335
 336 /*
 337  * Module init/exit functions
 338  */
 339 static int __init
 340 init_ath5k_pci(void)
 341 {
 342         int ret;
 343
 344         ret = pci_register_driver(&ath5k_pci_driver);
 345         if (ret) {
 346                 printk(KERN_ERR "ath5k_pci: can't register pci driver\n");
 347                 return ret;
 348         }
 349
 350         return 0;
 351 }
 352
 353 static void __exit
 354 exit_ath5k_pci(void)
 355 {
 356         pci_unregister_driver(&ath5k_pci_driver);
 357 }
 358
 359 module_init(init_ath5k_pci);
 360 module_exit(exit_ath5k_pci);