/*
* Copyright (c) 2008-2009 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 "../ath.h"
#include "ath5k.h"
#include "debug.h"
#include "base.h"
#include "reg.h"
/* Known PCI ids */
static DEFINE_PCI_DEVICE_TABLE(ath5k_pci_id_table) = {
{ PCI_VDEVICE(ATHEROS, 0x0207) }, /* 5210 early */
{ PCI_VDEVICE(ATHEROS, 0x0007) }, /* 5210 */
{ PCI_VDEVICE(ATHEROS, 0x0011) }, /* 5311 - this is on AHB bus !*/
{ PCI_VDEVICE(ATHEROS, 0x0012) }, /* 5211 */
{ PCI_VDEVICE(ATHEROS, 0x0013) }, /* 5212 */
{ PCI_VDEVICE(3COM_2, 0x0013) }, /* 3com 5212 */
{ PCI_VDEVICE(3COM, 0x0013) }, /* 3com 3CRDAG675 5212 */
{ PCI_VDEVICE(ATHEROS, 0x1014) }, /* IBM minipci 5212 */
{ PCI_VDEVICE(ATHEROS, 0x0014) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x0015) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x0016) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x0017) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x0018) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x0019) }, /* 5212 combatible */
{ PCI_VDEVICE(ATHEROS, 0x001a) }, /* 2413 Griffin-lite */
{ PCI_VDEVICE(ATHEROS, 0x001b) }, /* 5413 Eagle */
{ PCI_VDEVICE(ATHEROS, 0x001c) }, /* PCI-E cards */
{ PCI_VDEVICE(ATHEROS, 0x001d) }, /* 2417 Nala */
{ 0 }
};
MODULE_DEVICE_TABLE(pci, ath5k_pci_id_table);
/* return bus cachesize in 4B word units */
static void ath5k_pci_read_cachesize(struct ath_common *common, int *csz)
{
struct ath5k_softc *sc = (struct ath5k_softc *) common->priv;
u8 u8tmp;
pci_read_config_byte(sc->pdev, PCI_CACHE_LINE_SIZE, &u8tmp);
*csz = (int)u8tmp;
/*
* This check was put in to avoid "unplesant" consequences if
* the bootrom has not fully initialized all PCI devices.
* Sometimes the cache line size register is not set
*/
if (*csz == 0)
*csz = L1_CACHE_BYTES >> 2; /* Use the default size */
}
/*
* Read from eeprom
*/
static bool
ath5k_pci_eeprom_read(struct ath_common *common, u32 offset, u16 *data)
{
struct ath5k_hw *ah = (struct ath5k_hw *) common->ah;
u32 status, timeout;
/*
* Initialize EEPROM access
*/
if (ah->ah_version == AR5K_AR5210) {
AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_EEAE);
(void)ath5k_hw_reg_read(ah, AR5K_EEPROM_BASE + (4 * offset));
} else {
ath5k_hw_reg_write(ah, offset, AR5K_EEPROM_BASE);
AR5K_REG_ENABLE_BITS(ah, AR5K_EEPROM_CMD,
AR5K_EEPROM_CMD_READ);
}
for (timeout = AR5K_TUNE_REGISTER_TIMEOUT; timeout > 0; timeout--) {
status = ath5k_hw_reg_read(ah, AR5K_EEPROM_STATUS);
if (status & AR5K_EEPROM_STAT_RDDONE) {
if (status & AR5K_EEPROM_STAT_RDERR)
return false;
*data = (u16)(ath5k_hw_reg_read(ah, AR5K_EEPROM_DATA) &
0xffff);
return true;
}
udelay(15);
}
return false;
}
int ath5k_hw_read_srev(struct ath5k_hw *ah)
{
ah->ah_mac_srev = ath5k_hw_reg_read(ah, AR5K_SREV);
return 0;
}
/* Common ath_bus_opts structure */
static const struct ath_bus_ops ath_pci_bus_ops = {
.ath_bus_type = ATH_PCI,
.read_cachesize = ath5k_pci_read_cachesize,
.eeprom_read = ath5k_pci_eeprom_read,
};
/********************\
* PCI Initialization *
\********************/
static int __devinit
ath5k_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
void __iomem *mem;
struct ath5k_softc *sc;
struct ieee80211_hw *hw;
int ret;
u8 csz;
/*
* L0s needs to be disabled on all ath5k cards.
*
* For distributions shipping with CONFIG_PCIEASPM (this will be enabled
* by default in the future in 2.6.36) this will also mean both L1 and
* L0s will be disabled when a pre 1.1 PCIe device is detected. We do
* know L1 works correctly even for all ath5k pre 1.1 PCIe devices
* though but cannot currently undue the effect of a blacklist, for
* details you can read pcie_aspm_sanity_check() and see how it adjusts
* the device link capability.
*
* It may be possible in the future to implement some PCI API to allow
* drivers to override blacklists for pre 1.1 PCIe but for now it is
* best to accept that both L0s and L1 will be disabled completely for
* distributions shipping with CONFIG_PCIEASPM rather than having this
* issue present. Motivation for adding this new API will be to help
* with power consumption for some of these devices.
*/
pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
ret = pci_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "can't enable device\n");
goto err;
}
/* XXX 32-bit addressing only */
ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (ret) {
dev_err(&pdev->dev, "32-bit DMA not available\n");
goto err_dis;
}
/*
* 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 >> 2;
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);
/* Enable bus mastering */
pci_set_master(pdev);
/*
* Disable the RETRY_TIMEOUT register (0x41) to keep
* PCI Tx retries from interfering with C3 CPU state.
*/
pci_write_config_byte(pdev, 0x41, 0);
ret = pci_request_region(pdev, 0, "ath5k");
if (ret) {
dev_err(&pdev->dev, "cannot reserve PCI memory region\n");
goto err_dis;
}
mem = pci_iomap(pdev, 0, 0);
if (!mem) {
dev_err(&pdev->dev, "cannot remap PCI memory region\n") ;
ret = -EIO;
goto err_reg;
}
/*
* Allocate hw (mac80211 main struct)
* and hw->priv (driver private data)
*/
hw = ieee80211_alloc_hw(sizeof(*sc), &ath5k_hw_ops);
if (hw == NULL) {
dev_err(&pdev->dev, "cannot allocate ieee80211_hw\n");
ret = -ENOMEM;
goto err_map;
}
dev_info(&pdev->dev, "registered as '%s'\n", wiphy_name(hw->wiphy));
sc = hw->priv;
sc->hw = hw;
sc->pdev = pdev;
sc->dev = &pdev->dev;
sc->irq = pdev->irq;
sc->devid = id->device;
sc->iobase = mem; /* So we can unmap it on detach */
/* Initialize */
ret = ath5k_init_softc(sc, &ath_pci_bus_ops);
if (ret)
goto err_free;
/* Set private data */
pci_set_drvdata(pdev, hw);
return 0;
err_free:
ieee80211_free_hw(hw);
err_map:
pci_iounmap(pdev, mem);
err_reg:
pci_release_region(pdev, 0);
err_dis:
pci_disable_device(pdev);
err:
return ret;
}
static void __devexit
ath5k_pci_remove(struct pci_dev *pdev)
{
struct ieee80211_hw *hw = pci_get_drvdata(pdev);
struct ath5k_softc *sc = hw->priv;
ath5k_deinit_softc(sc);
pci_iounmap(pdev, sc->iobase);
pci_release_region(pdev, 0);
pci_disable_device(pdev);
ieee80211_free_hw(hw);
}
#ifdef CONFIG_PM_SLEEP
static int ath5k_pci_suspend(struct device *dev)
{
struct ath5k_softc *sc = pci_get_drvdata(to_pci_dev(dev));
ath5k_led_off(sc);
return 0;
}
static int ath5k_pci_resume(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct ath5k_softc *sc = pci_get_drvdata(pdev);
/*
* 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_write_config_byte(pdev, 0x41, 0);
ath5k_led_enable(sc);
return 0;
}
static SIMPLE_DEV_PM_OPS(ath5k_pm_ops, ath5k_pci_suspend, ath5k_pci_resume);
#define ATH5K_PM_OPS (&ath5k_pm_ops)
#else
#define ATH5K_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static struct pci_driver ath5k_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = ath5k_pci_id_table,
.probe = ath5k_pci_probe,
.remove = __devexit_p(ath5k_pci_remove),
.driver.pm = ATH5K_PM_OPS,
};
/*
* Module init/exit functions
*/
static int __init
init_ath5k_pci(void)
{
int ret;
ret = pci_register_driver(&ath5k_pci_driver);
if (ret) {
printk(KERN_ERR "ath5k_pci: can't register pci driver\n");
return ret;
}
return 0;
}
static void __exit
exit_ath5k_pci(void)
{
pci_unregister_driver(&ath5k_pci_driver);
}
module_init(init_ath5k_pci);
module_exit(exit_ath5k_pci);
