1 /* 2 * Copyright (c) 2008-2011 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 "unpleasant" 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_softc *sc; 130 struct ieee80211_hw *hw; 131 u8 csz; 132 u16 subsysid; 133 u32 val; 134 int ret = 0; 135 char hw_name[64]; 136 137 if (pci_enable_device(pdev)) 138 return -EIO; 139 140 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); 141 if (ret) { 142 printk(KERN_ERR "ath9k: 32-bit DMA not available\n"); 143 goto err_dma; 144 } 145 146 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); 147 if (ret) { 148 printk(KERN_ERR "ath9k: 32-bit DMA consistent " 149 "DMA enable failed\n"); 150 goto err_dma; 151 } 152 153 /* 154 * Cache line size is used to size and align various 155 * structures used to communicate with the hardware. 156 */ 157 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz); 158 if (csz == 0) { 159 /* 160 * Linux 2.4.18 (at least) writes the cache line size 161 * register as a 16-bit wide register which is wrong. 162 * We must have this setup properly for rx buffer 163 * DMA to work so force a reasonable value here if it 164 * comes up zero. 165 */ 166 csz = L1_CACHE_BYTES / sizeof(u32); 167 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz); 168 } 169 /* 170 * The default setting of latency timer yields poor results, 171 * set it to the value used by other systems. It may be worth 172 * tweaking this setting more. 173 */ 174 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8); 175 176 pci_set_master(pdev); 177 178 /* 179 * Disable the RETRY_TIMEOUT register (0x41) to keep 180 * PCI Tx retries from interfering with C3 CPU state. 181 */ 182 pci_read_config_dword(pdev, 0x40, &val); 183 if ((val & 0x0000ff00) != 0) 184 pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); 185 186 ret = pci_request_region(pdev, 0, "ath9k"); 187 if (ret) { 188 dev_err(&pdev->dev, "PCI memory region reserve error\n"); 189 ret = -ENODEV; 190 goto err_region; 191 } 192 193 mem = pci_iomap(pdev, 0, 0); 194 if (!mem) { 195 printk(KERN_ERR "PCI memory map error\n") ; 196 ret = -EIO; 197 goto err_iomap; 198 } 199 200 hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops); 201 if (!hw) { 202 dev_err(&pdev->dev, "No memory for ieee80211_hw\n"); 203 ret = -ENOMEM; 204 goto err_alloc_hw; 205 } 206 207 SET_IEEE80211_DEV(hw, &pdev->dev); 208 pci_set_drvdata(pdev, hw); 209 210 sc = hw->priv; 211 sc->hw = hw; 212 sc->dev = &pdev->dev; 213 sc->mem = mem; 214 215 /* Will be cleared in ath9k_start() */ 216 sc->sc_flags |= SC_OP_INVALID; 217 218 ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc); 219 if (ret) { 220 dev_err(&pdev->dev, "request_irq failed\n"); 221 goto err_irq; 222 } 223 224 sc->irq = pdev->irq; 225 226 pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsysid); 227 ret = ath9k_init_device(id->device, sc, subsysid, &ath_pci_bus_ops); 228 if (ret) { 229 dev_err(&pdev->dev, "Failed to initialize device\n"); 230 goto err_init; 231 } 232 233 ath9k_hw_name(sc->sc_ah, hw_name, sizeof(hw_name)); 234 wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n", 235 hw_name, (unsigned long)mem, pdev->irq); 236 237 return 0; 238 239 err_init: 240 free_irq(sc->irq, sc); 241 err_irq: 242 ieee80211_free_hw(hw); 243 err_alloc_hw: 244 pci_iounmap(pdev, mem); 245 err_iomap: 246 pci_release_region(pdev, 0); 247 err_region: 248 /* Nothing */ 249 err_dma: 250 pci_disable_device(pdev); 251 return ret; 252 } 253 254 static void ath_pci_remove(struct pci_dev *pdev) 255 { 256 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 257 struct ath_softc *sc = hw->priv; 258 void __iomem *mem = sc->mem; 259 260 if (!is_ath9k_unloaded) 261 sc->sc_ah->ah_flags |= AH_UNPLUGGED; 262 ath9k_deinit_device(sc); 263 free_irq(sc->irq, sc); 264 ieee80211_free_hw(sc->hw); 265 266 pci_iounmap(pdev, mem); 267 pci_disable_device(pdev); 268 pci_release_region(pdev, 0); 269 } 270 271 #ifdef CONFIG_PM 272 273 static int ath_pci_suspend(struct device *device) 274 { 275 struct pci_dev *pdev = to_pci_dev(device); 276 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 277 struct ath_softc *sc = hw->priv; 278 279 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1); 280 281 /* The device has to be moved to FULLSLEEP forcibly. 282 * Otherwise the chip never moved to full sleep, 283 * when no interface is up. 284 */ 285 ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP); 286 287 return 0; 288 } 289 290 static int ath_pci_resume(struct device *device) 291 { 292 struct pci_dev *pdev = to_pci_dev(device); 293 struct ieee80211_hw *hw = pci_get_drvdata(pdev); 294 struct ath_softc *sc = hw->priv; 295 u32 val; 296 297 /* 298 * Suspend/Resume resets the PCI configuration space, so we have to 299 * re-disable the RETRY_TIMEOUT register (0x41) to keep 300 * PCI Tx retries from interfering with C3 CPU state 301 */ 302 pci_read_config_dword(pdev, 0x40, &val); 303 if ((val & 0x0000ff00) != 0) 304 pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); 305 306 /* Enable LED */ 307 ath9k_hw_cfg_output(sc->sc_ah, sc->sc_ah->led_pin, 308 AR_GPIO_OUTPUT_MUX_AS_OUTPUT); 309 ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, 1); 310 311 /* 312 * Reset key cache to sane defaults (all entries cleared) instead of 313 * semi-random values after suspend/resume. 314 */ 315 ath9k_ps_wakeup(sc); 316 ath9k_init_crypto(sc); 317 ath9k_ps_restore(sc); 318 319 sc->ps_idle = true; 320 ath_radio_disable(sc, hw); 321 322 return 0; 323 } 324 325 static const struct dev_pm_ops ath9k_pm_ops = { 326 .suspend = ath_pci_suspend, 327 .resume = ath_pci_resume, 328 .freeze = ath_pci_suspend, 329 .thaw = ath_pci_resume, 330 .poweroff = ath_pci_suspend, 331 .restore = ath_pci_resume, 332 }; 333 334 #define ATH9K_PM_OPS (&ath9k_pm_ops) 335 336 #else /* !CONFIG_PM */ 337 338 #define ATH9K_PM_OPS NULL 339 340 #endif /* !CONFIG_PM */ 341 342 343 MODULE_DEVICE_TABLE(pci, ath_pci_id_table); 344 345 static struct pci_driver ath_pci_driver = { 346 .name = "ath9k", 347 .id_table = ath_pci_id_table, 348 .probe = ath_pci_probe, 349 .remove = ath_pci_remove, 350 .driver.pm = ATH9K_PM_OPS, 351 }; 352 353 int ath_pci_init(void) 354 { 355 return pci_register_driver(&ath_pci_driver); 356 } 357 358 void ath_pci_exit(void) 359 { 360 pci_unregister_driver(&ath_pci_driver); 361 } 362