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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/nl80211.h>
  20 #include <linux/pci.h>
  21 #include <linux/pci-aspm.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/module.h>
  24 #include "../ath.h"
  25 #include "ath5k.h"
  26 #include "debug.h"
  27 #include "base.h"
  28 #include "reg.h"
  29
  30 /* Known PCI ids */
  31 static DEFINE_PCI_DEVICE_TABLE(ath5k_pci_id_table) = {
  32         { PCI_VDEVICE(ATHEROS, 0x0207) }, /* 5210 early */
  33         { PCI_VDEVICE(ATHEROS, 0x0007) }, /* 5210 */
  34         { PCI_VDEVICE(ATHEROS, 0x0011) }, /* 5311 - this is on AHB bus !*/
  35         { PCI_VDEVICE(ATHEROS, 0x0012) }, /* 5211 */
  36         { PCI_VDEVICE(ATHEROS, 0x0013) }, /* 5212 */
  37         { PCI_VDEVICE(3COM_2,  0x0013) }, /* 3com 5212 */
  38         { PCI_VDEVICE(3COM,    0x0013) }, /* 3com 3CRDAG675 5212 */
  39         { PCI_VDEVICE(ATHEROS, 0x1014) }, /* IBM minipci 5212 */
  40         { PCI_VDEVICE(ATHEROS, 0x0014) }, /* 5212 compatible */
  41         { PCI_VDEVICE(ATHEROS, 0x0015) }, /* 5212 compatible */
  42         { PCI_VDEVICE(ATHEROS, 0x0016) }, /* 5212 compatible */
  43         { PCI_VDEVICE(ATHEROS, 0x0017) }, /* 5212 compatible */
  44         { PCI_VDEVICE(ATHEROS, 0x0018) }, /* 5212 compatible */
  45         { PCI_VDEVICE(ATHEROS, 0x0019) }, /* 5212 compatible */
  46         { PCI_VDEVICE(ATHEROS, 0x001a) }, /* 2413 Griffin-lite */
  47         { PCI_VDEVICE(ATHEROS, 0x001b) }, /* 5413 Eagle */
  48         { PCI_VDEVICE(ATHEROS, 0x001c) }, /* PCI-E cards */
  49         { PCI_VDEVICE(ATHEROS, 0x001d) }, /* 2417 Nala */
  50         { PCI_VDEVICE(ATHEROS, 0xff1b) }, /* AR5BXB63 */
  51         { 0 }
  52 };
  53 MODULE_DEVICE_TABLE(pci, ath5k_pci_id_table);
  54
  55 /* return bus cachesize in 4B word units */
  56 static void ath5k_pci_read_cachesize(struct ath_common *common, int *csz)
  57 {
  58         struct ath5k_hw *ah = (struct ath5k_hw *) common->priv;
  59         u8 u8tmp;
  60
  61         pci_read_config_byte(ah->pdev, PCI_CACHE_LINE_SIZE, &u8tmp);
  62         *csz = (int)u8tmp;
  63
  64         /*
  65          * This check was put in to avoid "unpleasant" consequences if
  66          * the bootrom has not fully initialized all PCI devices.
  67          * Sometimes the cache line size register is not set
  68          */
  69
  70         if (*csz == 0)
  71                 *csz = L1_CACHE_BYTES >> 2;   /* Use the default size */
  72 }
  73
  74 /*
  75  * Read from eeprom
  76  */
  77 static bool
  78 ath5k_pci_eeprom_read(struct ath_common *common, u32 offset, u16 *data)
  79 {
  80         struct ath5k_hw *ah = (struct ath5k_hw *) common->ah;
  81         u32 status, timeout;
  82
  83         /*
  84          * Initialize EEPROM access
  85          */
  86         if (ah->ah_version == AR5K_AR5210) {
  87                 AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_EEAE);
  88                 (void)ath5k_hw_reg_read(ah, AR5K_EEPROM_BASE + (4 * offset));
  89         } else {
  90                 ath5k_hw_reg_write(ah, offset, AR5K_EEPROM_BASE);
  91                 AR5K_REG_ENABLE_BITS(ah, AR5K_EEPROM_CMD,
  92                                 AR5K_EEPROM_CMD_READ);
  93         }
  94
  95         for (timeout = AR5K_TUNE_REGISTER_TIMEOUT; timeout > 0; timeout--) {
  96                 status = ath5k_hw_reg_read(ah, AR5K_EEPROM_STATUS);
  97                 if (status & AR5K_EEPROM_STAT_RDDONE) {
  98                         if (status & AR5K_EEPROM_STAT_RDERR)
  99                                 return false;
 100                         *data = (u16)(ath5k_hw_reg_read(ah, AR5K_EEPROM_DATA) &
 101                                         0xffff);
 102                         return true;
 103                 }
 104                 usleep_range(15, 20);
 105         }
 106
 107         return false;
 108 }
 109
 110 int ath5k_hw_read_srev(struct ath5k_hw *ah)
 111 {
 112         ah->ah_mac_srev = ath5k_hw_reg_read(ah, AR5K_SREV);
 113         return 0;
 114 }
 115
 116 /*
 117  * Read the MAC address from eeprom or platform_data
 118  */
 119 static int ath5k_pci_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
 120 {
 121         u8 mac_d[ETH_ALEN] = {};
 122         u32 total, offset;
 123         u16 data;
 124         int octet;
 125
 126         AR5K_EEPROM_READ(0x20, data);
 127
 128         for (offset = 0x1f, octet = 0, total = 0; offset >= 0x1d; offset--) {
 129                 AR5K_EEPROM_READ(offset, data);
 130
 131                 total += data;
 132                 mac_d[octet + 1] = data & 0xff;
 133                 mac_d[octet] = data >> 8;
 134                 octet += 2;
 135         }
 136
 137         if (!total || total == 3 * 0xffff)
 138                 return -EINVAL;
 139
 140         memcpy(mac, mac_d, ETH_ALEN);
 141
 142         return 0;
 143 }
 144
 145
 146 /* Common ath_bus_opts structure */
 147 static const struct ath_bus_ops ath_pci_bus_ops = {
 148         .ath_bus_type = ATH_PCI,
 149         .read_cachesize = ath5k_pci_read_cachesize,
 150         .eeprom_read = ath5k_pci_eeprom_read,
 151         .eeprom_read_mac = ath5k_pci_eeprom_read_mac,
 152 };
 153
 154 /********************\
 155 * PCI Initialization *
 156 \********************/
 157
 158 static int
 159 ath5k_pci_probe(struct pci_dev *pdev,
 160                 const struct pci_device_id *id)
 161 {
 162         void __iomem *mem;
 163         struct ath5k_hw *ah;
 164         struct ieee80211_hw *hw;
 165         int ret;
 166         u8 csz;
 167
 168         /*
 169          * L0s needs to be disabled on all ath5k cards.
 170          *
 171          * For distributions shipping with CONFIG_PCIEASPM (this will be enabled
 172          * by default in the future in 2.6.36) this will also mean both L1 and
 173          * L0s will be disabled when a pre 1.1 PCIe device is detected. We do
 174          * know L1 works correctly even for all ath5k pre 1.1 PCIe devices
 175          * though but cannot currently undue the effect of a blacklist, for
 176          * details you can read pcie_aspm_sanity_check() and see how it adjusts
 177          * the device link capability.
 178          *
 179          * It may be possible in the future to implement some PCI API to allow
 180          * drivers to override blacklists for pre 1.1 PCIe but for now it is
 181          * best to accept that both L0s and L1 will be disabled completely for
 182          * distributions shipping with CONFIG_PCIEASPM rather than having this
 183          * issue present. Motivation for adding this new API will be to help
 184          * with power consumption for some of these devices.
 185          */
 186         pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
 187
 188         ret = pci_enable_device(pdev);
 189         if (ret) {
 190                 dev_err(&pdev->dev, "can't enable device\n");
 191                 goto err;
 192         }
 193
 194         /* XXX 32-bit addressing only */
 195         ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 196         if (ret) {
 197                 dev_err(&pdev->dev, "32-bit DMA not available\n");
 198                 goto err_dis;
 199         }
 200
 201         /*
 202          * Cache line size is used to size and align various
 203          * structures used to communicate with the hardware.
 204          */
 205         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
 206         if (csz == 0) {
 207                 /*
 208                  * Linux 2.4.18 (at least) writes the cache line size
 209                  * register as a 16-bit wide register which is wrong.
 210                  * We must have this setup properly for rx buffer
 211                  * DMA to work so force a reasonable value here if it
 212                  * comes up zero.
 213                  */
 214                 csz = L1_CACHE_BYTES >> 2;
 215                 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
 216         }
 217         /*
 218          * The default setting of latency timer yields poor results,
 219          * set it to the value used by other systems.  It may be worth
 220          * tweaking this setting more.
 221          */
 222         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8);
 223
 224         /* Enable bus mastering */
 225         pci_set_master(pdev);
 226
 227         /*
 228          * Disable the RETRY_TIMEOUT register (0x41) to keep
 229          * PCI Tx retries from interfering with C3 CPU state.
 230          */
 231         pci_write_config_byte(pdev, 0x41, 0);
 232
 233         ret = pci_request_region(pdev, 0, "ath5k");
 234         if (ret) {
 235                 dev_err(&pdev->dev, "cannot reserve PCI memory region\n");
 236                 goto err_dis;
 237         }
 238
 239         mem = pci_iomap(pdev, 0, 0);
 240         if (!mem) {
 241                 dev_err(&pdev->dev, "cannot remap PCI memory region\n");
 242                 ret = -EIO;
 243                 goto err_reg;
 244         }
 245
 246         /*
 247          * Allocate hw (mac80211 main struct)
 248          * and hw->priv (driver private data)
 249          */
 250         hw = ieee80211_alloc_hw(sizeof(*ah), &ath5k_hw_ops);
 251         if (hw == NULL) {
 252                 dev_err(&pdev->dev, "cannot allocate ieee80211_hw\n");
 253                 ret = -ENOMEM;
 254                 goto err_map;
 255         }
 256
 257         dev_info(&pdev->dev, "registered as '%s'\n", wiphy_name(hw->wiphy));
 258
 259         ah = hw->priv;
 260         ah->hw = hw;
 261         ah->pdev = pdev;
 262         ah->dev = &pdev->dev;
 263         ah->irq = pdev->irq;
 264         ah->devid = id->device;
 265         ah->iobase = mem; /* So we can unmap it on detach */
 266
 267         /* Initialize */
 268         ret = ath5k_init_ah(ah, &ath_pci_bus_ops);
 269         if (ret)
 270                 goto err_free;
 271
 272         /* Set private data */
 273         pci_set_drvdata(pdev, hw);
 274
 275         return 0;
 276 err_free:
 277         ieee80211_free_hw(hw);
 278 err_map:
 279         pci_iounmap(pdev, mem);
 280 err_reg:
 281         pci_release_region(pdev, 0);
 282 err_dis:
 283         pci_disable_device(pdev);
 284 err:
 285         return ret;
 286 }
 287
 288 static void
 289 ath5k_pci_remove(struct pci_dev *pdev)
 290 {
 291         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 292         struct ath5k_hw *ah = hw->priv;
 293
 294         ath5k_deinit_ah(ah);
 295         pci_iounmap(pdev, ah->iobase);
 296         pci_release_region(pdev, 0);
 297         pci_disable_device(pdev);
 298         ieee80211_free_hw(hw);
 299 }
 300
 301 #ifdef CONFIG_PM_SLEEP
 302 static int ath5k_pci_suspend(struct device *dev)
 303 {
 304         struct pci_dev *pdev = to_pci_dev(dev);
 305         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 306         struct ath5k_hw *ah = hw->priv;
 307
 308         ath5k_led_off(ah);
 309         return 0;
 310 }
 311
 312 static int ath5k_pci_resume(struct device *dev)
 313 {
 314         struct pci_dev *pdev = to_pci_dev(dev);
 315         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
 316         struct ath5k_hw *ah = hw->priv;
 317
 318         /*
 319          * Suspend/Resume resets the PCI configuration space, so we have to
 320          * re-disable the RETRY_TIMEOUT register (0x41) to keep
 321          * PCI Tx retries from interfering with C3 CPU state
 322          */
 323         pci_write_config_byte(pdev, 0x41, 0);
 324
 325         ath5k_led_enable(ah);
 326         return 0;
 327 }
 328
 329 static SIMPLE_DEV_PM_OPS(ath5k_pm_ops, ath5k_pci_suspend, ath5k_pci_resume);
 330 #define ATH5K_PM_OPS    (&ath5k_pm_ops)
 331 #else
 332 #define ATH5K_PM_OPS    NULL
 333 #endif /* CONFIG_PM_SLEEP */
 334
 335 static struct pci_driver ath5k_pci_driver = {
 336         .name           = KBUILD_MODNAME,
 337         .id_table       = ath5k_pci_id_table,
 338         .probe          = ath5k_pci_probe,
 339         .remove         = ath5k_pci_remove,
 340         .driver.pm      = ATH5K_PM_OPS,
 341 };
 342
 343 module_pci_driver(ath5k_pci_driver);