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/ath9k_platform.h> 20 #include "ath9k.h" 21 22 static DEFINE_PCI_DEVICE_TABLE(ath_pci_id_table) = { 23 { PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI */ 24 { PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */ 25 { PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI */ 26 { PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI */ 27 { PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */ 28 { PCI_VDEVICE(ATHEROS, 0x002B) }, /* PCI-E */ 29 { PCI_VDEVICE(ATHEROS, 0x002C) }, /* PCI-E 802.11n bonded out */ 30 { PCI_VDEVICE(ATHEROS, 0x002D) }, /* PCI */ 31 { PCI_VDEVICE(ATHEROS, 0x002E) }, /* PCI-E */ 32 { PCI_VDEVICE(ATHEROS, 0x0030) }, /* PCI-E AR9300 */ 33 { PCI_VDEVICE(ATHEROS, 0x0032) }, /* PCI-E AR9485 */ 34 { 0 } 35 }; 36 37 /* return bus cachesize in 4B word units */ 38 static void ath_pci_read_cachesize(struct ath_common *common, int *csz) 39 { 40 struct ath_softc *sc = (struct ath_softc *) common->priv; 41 u8 u8tmp; 42 43 pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp); 44 *csz = (int)u8tmp; 45 46 /* 47 * This check was put in to avoid "unplesant" consequences if 48 * the bootrom has not fully initialized all PCI devices. 49 * Sometimes the cache line size register is not set 50 */ 51 52 if (*csz == 0) 53 *csz = DEFAULT_CACHELINE >> 2; /* Use the default size */ 54 } 55 56 static bool ath_pci_eeprom_read(struct ath_common *common, u32 off, u16 *data) 57 { 58 struct ath_softc *sc = (struct ath_softc *) common->priv; 59 struct ath9k_platform_data *pdata = sc->dev->platform_data; 60 61 if (pdata) { 62 if (off >= (ARRAY_SIZE(pdata->eeprom_data))) { 63 ath_err(common, 64 "%s: eeprom read failed, offset %08x is out of range\n", 65 __func__, off); 66 } 67 68 *data = pdata->eeprom_data[off]; 69 } else { 70 struct ath_hw *ah = (struct ath_hw *) common->ah; 71 72 common->ops->read(ah, AR5416_EEPROM_OFFSET + 73 (off << AR5416_EEPROM_S)); 74 75 if (!ath9k_hw_wait(ah, 76 AR_EEPROM_STATUS_DATA, 77 AR_EEPROM_STATUS_DATA_BUSY | 78 AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0, 79 AH_WAIT_TIMEOUT)) { 80 return false; 81 } 82 83 *data = MS(common->ops->read(ah, AR_EEPROM_STATUS_DATA), 84 AR_EEPROM_STATUS_DATA_VAL); 85 } 86 87 return true; 88 } 89 90 /* 91 * Bluetooth coexistance requires disabling ASPM. 92 */ 93 static void ath_pci_bt_coex_prep(struct ath_common *common) 94 { 95 struct ath_softc *sc = (struct ath_softc *) common->priv; 96 struct pci_dev *pdev = to_pci_dev(sc->dev); 97 u8 aspm; 98 99 if (!pci_is_pcie(pdev)) 100 return; 101 102 pci_read_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, &aspm); 103 aspm &= ~(ATH_PCIE_CAP_LINK_L0S | ATH_PCIE_CAP_LINK_L1); 104 pci_write_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, aspm); 105 } 106 107 static void ath_pci_extn_synch_enable(struct ath_common *common) 108 { 109 struct ath_softc *sc = (struct ath_softc *) common->priv; 110 struct pci_dev *pdev = to_pci_dev(sc->dev); 111 u8 lnkctl; 112 113 pci_read_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, &lnkctl); 114 lnkctl |= PCI_EXP_LNKCTL_ES; 115 pci_write_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, lnkctl); 116 } 117 118 static const struct ath_bus_ops ath_pci_bus_ops = { 119 .ath_bus_type = ATH_PCI, 120 .read_cachesize = ath_pci_read_cachesize, 121 .eeprom_read = ath_pci_eeprom_read, 122 .bt_coex_prep = ath_pci_bt_coex_prep, 123 .extn_synch_en = ath_pci_extn_synch_enable, 124 }; 125 126 static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 127 { 128 void __iomem *mem; 129 struct ath_wiphy *aphy; 130 struct ath_softc *sc; 131 struct ieee80211_hw *hw; 132 u8 csz; 133 u16 subsysid; 134 u32 val; 135 int ret = 0; 136 char hw_name[64]; 137 138 if (pci_enable_device(pdev)) 139 return -EIO; 140 141 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); 142 if (ret) { 143 printk(KERN_ERR "ath9k: 32-bit DMA not available\n"); 144 goto err_dma; 145 } 146 147 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); 148 if (ret) { 149 printk(KERN_ERR "ath9k: 32-bit DMA consistent " 150 "DMA enable failed\n"); 151 goto err_dma; 152 } 153 154 /* 155 * Cache line size is used to size and align various 156 * structures used to communicate with the hardware. 157 */ 158 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz); 159 if (csz == 0) { 160 /* 161 * Linux 2.4.18 (at least) writes the cache line size 162 * register as a 16-bit wide register which is wrong. 163 * We must have this setup properly for rx buffer 164 * DMA to work so force a reasonable value here if it 165 * comes up zero. 166 */ 167 csz = L1_CACHE_BYTES / sizeof(u32); 168 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz); 169 } 170 /* 171 * The default setting of latency timer yields poor results, 172 * set it to the value used by other systems. It may be worth 173 * tweaking this setting more. 174 */ 175 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8); 176 177 pci_set_master(pdev); 178 179 /* 180 * Disable the RETRY_TIMEOUT register (0x41) to keep 181 * PCI Tx retries from interfering with C3 CPU state. 182 */ 183 pci_read_config_dword(pdev, 0x40, &val); 184 if ((val & 0x0000ff00) != 0) 185 pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); 186 187 ret = pci_request_region(pdev, 0, "ath9k"); 188 if (ret) { 189 dev_err(&pdev->dev, "PCI memory region reserve error\n"); 190 ret = -ENODEV; 191 goto err_region; 192 } 193 194 mem = pci_iomap(pdev, 0, 0); 195 if (!mem) { 196 printk(KERN_ERR "PCI memory map error\n") ; 197 ret = -EIO; 198 goto err_iomap; 199 } 200 201 hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy) + 202 sizeof(struct ath_softc), &ath9k_ops); 203 if (!hw) { 204 dev_err(&pdev->dev, "No memory for ieee80211_hw\n"); 205 ret = -ENOMEM; 206 goto err_alloc_hw; 207 } 208 209 SET_IEEE80211_DEV(hw, &pdev->dev); 210 pci_set_drvdata(pdev, hw); 211 212 aphy = hw->priv; 213 sc = (struct ath_softc *) (aphy + 1); 214 aphy->sc = sc; 215 aphy->hw = hw; 216 sc->pri_wiphy = aphy; 217 sc->hw = hw; 218 sc->dev = &pdev->dev; 219 sc->mem = mem; 220 221 /* Will be cleared in ath9k_start() */ 222 sc->sc_flags |= SC_OP_INVALID; 223 224 ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc); 225 if (ret) { 226 dev_err(&pdev->dev, "request_irq failed\n"); 227 goto err_irq; 228 } 229 230 sc->irq = pdev->irq; 231 232 pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsysid); 233 ret = ath9k_init_device(id->device, sc, subsysid, &ath_pci_bus_ops); 234 if (ret) { 235 dev_err(&pdev->dev, "Failed to initialize device\n"); 236 goto err_init; 237 } 238 239 ath9k_hw_name(sc->sc_ah, hw_name, sizeof(hw_name)); 240 wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n", 241 hw_name, (unsigned long)mem, pdev->irq); 242 243 return 0; 244 245 err_init: 246 free_irq(sc->irq, sc); 247 err_irq: 248 ieee80211_free_hw(hw); 249 err_alloc_hw: 250 pci_iounmap(pdev, mem); 251 err_iomap: 252 pci_release_region(pdev, 0); 253 err_region: 254 /* Nothing */ 255 err_dma: 256 pci_disable_device(pdev); 257 return ret; 258 } 259 260 static void ath_pci_remove(struct pci_dev *pdev) 261 { 262 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 263 struct ath_wiphy *aphy = hw->priv; 264 struct ath_softc *sc = aphy->sc; 265 void __iomem *mem = sc->mem; 266 267 if (!is_ath9k_unloaded) 268 sc->sc_ah->ah_flags |= AH_UNPLUGGED; 269 ath9k_deinit_device(sc); 270 free_irq(sc->irq, sc); 271 ieee80211_free_hw(sc->hw); 272 273 pci_iounmap(pdev, mem); 274 pci_disable_device(pdev); 275 pci_release_region(pdev, 0); 276 } 277 278 #ifdef CONFIG_PM 279 280 static int ath_pci_suspend(struct device *device) 281 { 282 struct pci_dev *pdev = to_pci_dev(device); 283 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 284 struct ath_wiphy *aphy = hw->priv; 285 struct ath_softc *sc = aphy->sc; 286 287 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1); 288 289 return 0; 290 } 291 292 static int ath_pci_resume(struct device *device) 293 { 294 struct pci_dev *pdev = to_pci_dev(device); 295 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 296 struct ath_wiphy *aphy = hw->priv; 297 struct ath_softc *sc = aphy->sc; 298 u32 val; 299 300 /* 301 * Suspend/Resume resets the PCI configuration space, so we have to 302 * re-disable the RETRY_TIMEOUT register (0x41) to keep 303 * PCI Tx retries from interfering with C3 CPU state 304 */ 305 pci_read_config_dword(pdev, 0x40, &val); 306 if ((val & 0x0000ff00) != 0) 307 pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); 308 309 /* Enable LED */ 310 ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin, 311 AR_GPIO_OUTPUT_MUX_AS_OUTPUT); 312 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1); 313 314 /* 315 * Reset key cache to sane defaults (all entries cleared) instead of 316 * semi-random values after suspend/resume. 317 */ 318 ath9k_ps_wakeup(sc); 319 ath9k_init_crypto(sc); 320 ath9k_ps_restore(sc); 321 322 sc->ps_idle = true; 323 ath9k_set_wiphy_idle(aphy, true); 324 ath_radio_disable(sc, hw); 325 326 return 0; 327 } 328 329 static const struct dev_pm_ops ath9k_pm_ops = { 330 .suspend = ath_pci_suspend, 331 .resume = ath_pci_resume, 332 .freeze = ath_pci_suspend, 333 .thaw = ath_pci_resume, 334 .poweroff = ath_pci_suspend, 335 .restore = ath_pci_resume, 336 }; 337 338 #define ATH9K_PM_OPS (&ath9k_pm_ops) 339 340 #else /* !CONFIG_PM */ 341 342 #define ATH9K_PM_OPS NULL 343 344 #endif /* !CONFIG_PM */ 345 346 347 MODULE_DEVICE_TABLE(pci, ath_pci_id_table); 348 349 static struct pci_driver ath_pci_driver = { 350 .name = "ath9k", 351 .id_table = ath_pci_id_table, 352 .probe = ath_pci_probe, 353 .remove = ath_pci_remove, 354 .driver.pm = ATH9K_PM_OPS, 355 }; 356 357 int ath_pci_init(void) 358 { 359 return pci_register_driver(&ath_pci_driver); 360 } 361 362 void ath_pci_exit(void) 363 { 364 pci_unregister_driver(&ath_pci_driver); 365 } 366