| /* |
| * Copyright (c) 2008-2011 Atheros Communications Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/nl80211.h> |
| #include <linux/pci.h> |
| #include <linux/pci-aspm.h> |
| #include <linux/ath9k_platform.h> |
| #include <linux/module.h> |
| #include "ath9k.h" |
| |
| static DEFINE_PCI_DEVICE_TABLE(ath_pci_id_table) = { |
| { PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI */ |
| { PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */ |
| { PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI */ |
| { PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI */ |
| { PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */ |
| { PCI_VDEVICE(ATHEROS, 0x002B) }, /* PCI-E */ |
| { PCI_VDEVICE(ATHEROS, 0x002C) }, /* PCI-E 802.11n bonded out */ |
| { PCI_VDEVICE(ATHEROS, 0x002D) }, /* PCI */ |
| { PCI_VDEVICE(ATHEROS, 0x002E) }, /* PCI-E */ |
| { PCI_VDEVICE(ATHEROS, 0x0030) }, /* PCI-E AR9300 */ |
| { PCI_VDEVICE(ATHEROS, 0x0032) }, /* PCI-E AR9485 */ |
| { PCI_VDEVICE(ATHEROS, 0x0033) }, /* PCI-E AR9580 */ |
| { PCI_VDEVICE(ATHEROS, 0x0034) }, /* PCI-E AR9462 */ |
| { PCI_VDEVICE(ATHEROS, 0x0037) }, /* PCI-E AR1111/AR9485 */ |
| { 0 } |
| }; |
| |
| |
| /* return bus cachesize in 4B word units */ |
| static void ath_pci_read_cachesize(struct ath_common *common, int *csz) |
| { |
| struct ath_softc *sc = (struct ath_softc *) common->priv; |
| u8 u8tmp; |
| |
| pci_read_config_byte(to_pci_dev(sc->dev), PCI_CACHE_LINE_SIZE, &u8tmp); |
| *csz = (int)u8tmp; |
| |
| /* |
| * This check was put in to avoid "unpleasant" consequences if |
| * the bootrom has not fully initialized all PCI devices. |
| * Sometimes the cache line size register is not set |
| */ |
| |
| if (*csz == 0) |
| *csz = DEFAULT_CACHELINE >> 2; /* Use the default size */ |
| } |
| |
| static bool ath_pci_eeprom_read(struct ath_common *common, u32 off, u16 *data) |
| { |
| struct ath_softc *sc = (struct ath_softc *) common->priv; |
| struct ath9k_platform_data *pdata = sc->dev->platform_data; |
| |
| if (pdata) { |
| if (off >= (ARRAY_SIZE(pdata->eeprom_data))) { |
| ath_err(common, |
| "%s: eeprom read failed, offset %08x is out of range\n", |
| __func__, off); |
| } |
| |
| *data = pdata->eeprom_data[off]; |
| } else { |
| struct ath_hw *ah = (struct ath_hw *) common->ah; |
| |
| common->ops->read(ah, AR5416_EEPROM_OFFSET + |
| (off << AR5416_EEPROM_S)); |
| |
| if (!ath9k_hw_wait(ah, |
| AR_EEPROM_STATUS_DATA, |
| AR_EEPROM_STATUS_DATA_BUSY | |
| AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0, |
| AH_WAIT_TIMEOUT)) { |
| return false; |
| } |
| |
| *data = MS(common->ops->read(ah, AR_EEPROM_STATUS_DATA), |
| AR_EEPROM_STATUS_DATA_VAL); |
| } |
| |
| return true; |
| } |
| |
| static void ath_pci_extn_synch_enable(struct ath_common *common) |
| { |
| struct ath_softc *sc = (struct ath_softc *) common->priv; |
| struct pci_dev *pdev = to_pci_dev(sc->dev); |
| u8 lnkctl; |
| |
| pci_read_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, &lnkctl); |
| lnkctl |= PCI_EXP_LNKCTL_ES; |
| pci_write_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, lnkctl); |
| } |
| |
| /* Need to be called after we discover btcoex capabilities */ |
| static void ath_pci_aspm_init(struct ath_common *common) |
| { |
| struct ath_softc *sc = (struct ath_softc *) common->priv; |
| struct ath_hw *ah = sc->sc_ah; |
| struct pci_dev *pdev = to_pci_dev(sc->dev); |
| struct pci_dev *parent; |
| int pos; |
| u8 aspm; |
| |
| if (!ah->is_pciexpress) |
| return; |
| |
| pos = pci_pcie_cap(pdev); |
| if (!pos) |
| return; |
| |
| parent = pdev->bus->self; |
| if (!parent) |
| return; |
| |
| if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_NONE) { |
| /* Bluetooth coexistance requires disabling ASPM. */ |
| pci_read_config_byte(pdev, pos + PCI_EXP_LNKCTL, &aspm); |
| aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1); |
| pci_write_config_byte(pdev, pos + PCI_EXP_LNKCTL, aspm); |
| |
| /* |
| * Both upstream and downstream PCIe components should |
| * have the same ASPM settings. |
| */ |
| pos = pci_pcie_cap(parent); |
| pci_read_config_byte(parent, pos + PCI_EXP_LNKCTL, &aspm); |
| aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1); |
| pci_write_config_byte(parent, pos + PCI_EXP_LNKCTL, aspm); |
| |
| ath_info(common, "Disabling ASPM since BTCOEX is enabled\n"); |
| return; |
| } |
| |
| pos = pci_pcie_cap(parent); |
| pci_read_config_byte(parent, pos + PCI_EXP_LNKCTL, &aspm); |
| if (aspm & (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1)) { |
| ah->aspm_enabled = true; |
| /* Initialize PCIe PM and SERDES registers. */ |
| ath9k_hw_configpcipowersave(ah, false); |
| ath_info(common, "ASPM enabled: 0x%x\n", aspm); |
| } |
| } |
| |
| static const struct ath_bus_ops ath_pci_bus_ops = { |
| .ath_bus_type = ATH_PCI, |
| .read_cachesize = ath_pci_read_cachesize, |
| .eeprom_read = ath_pci_eeprom_read, |
| .extn_synch_en = ath_pci_extn_synch_enable, |
| .aspm_init = ath_pci_aspm_init, |
| }; |
| |
| static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
| { |
| void __iomem *mem; |
| struct ath_softc *sc; |
| struct ieee80211_hw *hw; |
| u8 csz; |
| u32 val; |
| int ret = 0; |
| char hw_name[64]; |
| |
| if (pci_enable_device(pdev)) |
| return -EIO; |
| |
| ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); |
| if (ret) { |
| pr_err("32-bit DMA not available\n"); |
| goto err_dma; |
| } |
| |
| ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); |
| if (ret) { |
| pr_err("32-bit DMA consistent DMA enable failed\n"); |
| goto err_dma; |
| } |
| |
| /* |
| * Cache line size is used to size and align various |
| * structures used to communicate with the hardware. |
| */ |
| pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz); |
| if (csz == 0) { |
| /* |
| * Linux 2.4.18 (at least) writes the cache line size |
| * register as a 16-bit wide register which is wrong. |
| * We must have this setup properly for rx buffer |
| * DMA to work so force a reasonable value here if it |
| * comes up zero. |
| */ |
| csz = L1_CACHE_BYTES / sizeof(u32); |
| pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz); |
| } |
| /* |
| * The default setting of latency timer yields poor results, |
| * set it to the value used by other systems. It may be worth |
| * tweaking this setting more. |
| */ |
| pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8); |
| |
| pci_set_master(pdev); |
| |
| /* |
| * Disable the RETRY_TIMEOUT register (0x41) to keep |
| * PCI Tx retries from interfering with C3 CPU state. |
| */ |
| pci_read_config_dword(pdev, 0x40, &val); |
| if ((val & 0x0000ff00) != 0) |
| pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); |
| |
| ret = pci_request_region(pdev, 0, "ath9k"); |
| if (ret) { |
| dev_err(&pdev->dev, "PCI memory region reserve error\n"); |
| ret = -ENODEV; |
| goto err_region; |
| } |
| |
| mem = pci_iomap(pdev, 0, 0); |
| if (!mem) { |
| pr_err("PCI memory map error\n") ; |
| ret = -EIO; |
| goto err_iomap; |
| } |
| |
| hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops); |
| if (!hw) { |
| dev_err(&pdev->dev, "No memory for ieee80211_hw\n"); |
| ret = -ENOMEM; |
| goto err_alloc_hw; |
| } |
| |
| SET_IEEE80211_DEV(hw, &pdev->dev); |
| pci_set_drvdata(pdev, hw); |
| |
| sc = hw->priv; |
| sc->hw = hw; |
| sc->dev = &pdev->dev; |
| sc->mem = mem; |
| |
| /* Will be cleared in ath9k_start() */ |
| set_bit(SC_OP_INVALID, &sc->sc_flags); |
| |
| ret = request_irq(pdev->irq, ath_isr, IRQF_SHARED, "ath9k", sc); |
| if (ret) { |
| dev_err(&pdev->dev, "request_irq failed\n"); |
| goto err_irq; |
| } |
| |
| sc->irq = pdev->irq; |
| |
| ret = ath9k_init_device(id->device, sc, &ath_pci_bus_ops); |
| if (ret) { |
| dev_err(&pdev->dev, "Failed to initialize device\n"); |
| goto err_init; |
| } |
| |
| ath9k_hw_name(sc->sc_ah, hw_name, sizeof(hw_name)); |
| wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n", |
| hw_name, (unsigned long)mem, pdev->irq); |
| |
| return 0; |
| |
| err_init: |
| free_irq(sc->irq, sc); |
| err_irq: |
| ieee80211_free_hw(hw); |
| err_alloc_hw: |
| pci_iounmap(pdev, mem); |
| err_iomap: |
| pci_release_region(pdev, 0); |
| err_region: |
| /* Nothing */ |
| err_dma: |
| pci_disable_device(pdev); |
| return ret; |
| } |
| |
| static void ath_pci_remove(struct pci_dev *pdev) |
| { |
| struct ieee80211_hw *hw = pci_get_drvdata(pdev); |
| struct ath_softc *sc = hw->priv; |
| void __iomem *mem = sc->mem; |
| |
| if (!is_ath9k_unloaded) |
| sc->sc_ah->ah_flags |= AH_UNPLUGGED; |
| ath9k_deinit_device(sc); |
| free_irq(sc->irq, sc); |
| ieee80211_free_hw(sc->hw); |
| |
| pci_iounmap(pdev, mem); |
| pci_disable_device(pdev); |
| pci_release_region(pdev, 0); |
| } |
| |
| #ifdef CONFIG_PM |
| |
| static int ath_pci_suspend(struct device *device) |
| { |
| struct pci_dev *pdev = to_pci_dev(device); |
| struct ieee80211_hw *hw = pci_get_drvdata(pdev); |
| struct ath_softc *sc = hw->priv; |
| |
| if (sc->wow_enabled) |
| return 0; |
| |
| /* The device has to be moved to FULLSLEEP forcibly. |
| * Otherwise the chip never moved to full sleep, |
| * when no interface is up. |
| */ |
| ath9k_hw_disable(sc->sc_ah); |
| ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP); |
| |
| return 0; |
| } |
| |
| static int ath_pci_resume(struct device *device) |
| { |
| struct pci_dev *pdev = to_pci_dev(device); |
| u32 val; |
| |
| /* |
| * Suspend/Resume resets the PCI configuration space, so we have to |
| * re-disable the RETRY_TIMEOUT register (0x41) to keep |
| * PCI Tx retries from interfering with C3 CPU state |
| */ |
| pci_read_config_dword(pdev, 0x40, &val); |
| if ((val & 0x0000ff00) != 0) |
| pci_write_config_dword(pdev, 0x40, val & 0xffff00ff); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops ath9k_pm_ops = { |
| .suspend = ath_pci_suspend, |
| .resume = ath_pci_resume, |
| .freeze = ath_pci_suspend, |
| .thaw = ath_pci_resume, |
| .poweroff = ath_pci_suspend, |
| .restore = ath_pci_resume, |
| }; |
| |
| #define ATH9K_PM_OPS (&ath9k_pm_ops) |
| |
| #else /* !CONFIG_PM */ |
| |
| #define ATH9K_PM_OPS NULL |
| |
| #endif /* !CONFIG_PM */ |
| |
| |
| MODULE_DEVICE_TABLE(pci, ath_pci_id_table); |
| |
| static struct pci_driver ath_pci_driver = { |
| .name = "ath9k", |
| .id_table = ath_pci_id_table, |
| .probe = ath_pci_probe, |
| .remove = ath_pci_remove, |
| .driver.pm = ATH9K_PM_OPS, |
| }; |
| |
| int ath_pci_init(void) |
| { |
| return pci_register_driver(&ath_pci_driver); |
| } |
| |
| void ath_pci_exit(void) |
| { |
| pci_unregister_driver(&ath_pci_driver); |
| } |