/* * 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. */ #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 */ { 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; 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); 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); } } 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) { printk(KERN_ERR "ath9k: 32-bit DMA not available\n"); goto err_dma; } ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); if (ret) { printk(KERN_ERR "ath9k: 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) { printk(KERN_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() */ sc->sc_flags |= SC_OP_INVALID; 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; /* 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); }