/*
* 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_stop_btcoex(sc);
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);
}
