Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / iwlwifi / iwl-pci.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2007 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>

#include "iwl-bus.h"
#include "iwl-io.h"
#include "iwl-shared.h"
#include "iwl-trans.h"
#include "iwl-csr.h"
#include "iwl-cfg.h"

/* PCI registers */
#define PCI_CFG_RETRY_TIMEOUT   0x041
#define PCI_CFG_LINK_CTRL_VAL_L0S_EN    0x01
#define PCI_CFG_LINK_CTRL_VAL_L1_EN     0x02

struct iwl_pci_bus {
        /* basic pci-network driver stuff */
        struct pci_dev *pci_dev;

        /* pci hardware address support */
        void __iomem *hw_base;
};

#define IWL_BUS_GET_PCI_BUS(_iwl_bus) \
                        ((struct iwl_pci_bus *) ((_iwl_bus)->bus_specific))

#define IWL_BUS_GET_PCI_DEV(_iwl_bus) \
                        ((IWL_BUS_GET_PCI_BUS(_iwl_bus))->pci_dev)

static u16 iwl_pciexp_link_ctrl(struct iwl_bus *bus)
{
        int pos;
        u16 pci_lnk_ctl;

        struct pci_dev *pci_dev = IWL_BUS_GET_PCI_DEV(bus);

        pos = pci_pcie_cap(pci_dev);
        pci_read_config_word(pci_dev, pos + PCI_EXP_LNKCTL, &pci_lnk_ctl);
        return pci_lnk_ctl;
}

static bool iwl_pci_is_pm_supported(struct iwl_bus *bus)
{
        u16 lctl = iwl_pciexp_link_ctrl(bus);

        return !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
}

static void iwl_pci_apm_config(struct iwl_bus *bus)
{
        /*
         * HW bug W/A for instability in PCIe bus L0S->L1 transition.
         * Check if BIOS (or OS) enabled L1-ASPM on this device.
         * If so (likely), disable L0S, so device moves directly L0->L1;
         *    costs negligible amount of power savings.
         * If not (unlikely), enable L0S, so there is at least some
         *    power savings, even without L1.
         */
        u16 lctl = iwl_pciexp_link_ctrl(bus);

        if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
                                PCI_CFG_LINK_CTRL_VAL_L1_EN) {
                /* L1-ASPM enabled; disable(!) L0S */
                iwl_set_bit(bus, CSR_GIO_REG,
                                CSR_GIO_REG_VAL_L0S_ENABLED);
                dev_printk(KERN_INFO, bus->dev, "L1 Enabled; Disabling L0S\n");
        } else {
                /* L1-ASPM disabled; enable(!) L0S */
                iwl_clear_bit(bus, CSR_GIO_REG,
                                CSR_GIO_REG_VAL_L0S_ENABLED);
                dev_printk(KERN_INFO, bus->dev, "L1 Disabled; Enabling L0S\n");
        }
}

static void iwl_pci_get_hw_id(struct iwl_bus *bus, char buf[],
                              int buf_len)
{
        struct pci_dev *pci_dev = IWL_BUS_GET_PCI_DEV(bus);

        snprintf(buf, buf_len, "PCI ID: 0x%04X:0x%04X", pci_dev->device,
                 pci_dev->subsystem_device);
}

static void iwl_pci_write8(struct iwl_bus *bus, u32 ofs, u8 val)
{
        iowrite8(val, IWL_BUS_GET_PCI_BUS(bus)->hw_base + ofs);
}

static void iwl_pci_write32(struct iwl_bus *bus, u32 ofs, u32 val)
{
        iowrite32(val, IWL_BUS_GET_PCI_BUS(bus)->hw_base + ofs);
}

static u32 iwl_pci_read32(struct iwl_bus *bus, u32 ofs)
{
        u32 val = ioread32(IWL_BUS_GET_PCI_BUS(bus)->hw_base + ofs);
        return val;
}

static const struct iwl_bus_ops bus_ops_pci = {
        .get_pm_support = iwl_pci_is_pm_supported,
        .apm_config = iwl_pci_apm_config,
        .get_hw_id = iwl_pci_get_hw_id,
        .write8 = iwl_pci_write8,
        .write32 = iwl_pci_write32,
        .read32 = iwl_pci_read32,
};

#define IWL_PCI_DEVICE(dev, subdev, cfg) \
        .vendor = PCI_VENDOR_ID_INTEL,  .device = (dev), \
        .subvendor = PCI_ANY_ID, .subdevice = (subdev), \
        .driver_data = (kernel_ulong_t)&(cfg)

/* Hardware specific file defines the PCI IDs table for that hardware module */
static DEFINE_PCI_DEVICE_TABLE(iwl_hw_card_ids) = {
        {IWL_PCI_DEVICE(0x4232, 0x1201, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1301, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1204, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1304, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1205, iwl5100_bgn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1305, iwl5100_bgn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1206, iwl5100_abg_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1306, iwl5100_abg_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1221, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1321, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1224, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1324, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1225, iwl5100_bgn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1325, iwl5100_bgn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1226, iwl5100_abg_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4232, 0x1326, iwl5100_abg_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1211, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1311, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1214, iwl5100_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1314, iwl5100_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1215, iwl5100_bgn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1315, iwl5100_bgn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1216, iwl5100_abg_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4237, 0x1316, iwl5100_abg_cfg)}, /* Half Mini Card */

/* 5300 Series WiFi */
        {IWL_PCI_DEVICE(0x4235, 0x1021, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1121, iwl5300_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1024, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1124, iwl5300_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1001, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1101, iwl5300_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1004, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4235, 0x1104, iwl5300_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4236, 0x1011, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4236, 0x1111, iwl5300_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x4236, 0x1014, iwl5300_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x4236, 0x1114, iwl5300_agn_cfg)}, /* Half Mini Card */

/* 5350 Series WiFi/WiMax */
        {IWL_PCI_DEVICE(0x423A, 0x1001, iwl5350_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423A, 0x1021, iwl5350_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423B, 0x1011, iwl5350_agn_cfg)}, /* Mini Card */

/* 5150 Series Wifi/WiMax */
        {IWL_PCI_DEVICE(0x423C, 0x1201, iwl5150_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423C, 0x1301, iwl5150_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x423C, 0x1206, iwl5150_abg_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423C, 0x1306, iwl5150_abg_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x423C, 0x1221, iwl5150_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423C, 0x1321, iwl5150_agn_cfg)}, /* Half Mini Card */

        {IWL_PCI_DEVICE(0x423D, 0x1211, iwl5150_agn_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423D, 0x1311, iwl5150_agn_cfg)}, /* Half Mini Card */
        {IWL_PCI_DEVICE(0x423D, 0x1216, iwl5150_abg_cfg)}, /* Mini Card */
        {IWL_PCI_DEVICE(0x423D, 0x1316, iwl5150_abg_cfg)}, /* Half Mini Card */

/* 6x00 Series */
        {IWL_PCI_DEVICE(0x422B, 0x1101, iwl6000_3agn_cfg)},
        {IWL_PCI_DEVICE(0x422B, 0x1121, iwl6000_3agn_cfg)},
        {IWL_PCI_DEVICE(0x422C, 0x1301, iwl6000i_2agn_cfg)},
        {IWL_PCI_DEVICE(0x422C, 0x1306, iwl6000i_2abg_cfg)},
        {IWL_PCI_DEVICE(0x422C, 0x1307, iwl6000i_2bg_cfg)},
        {IWL_PCI_DEVICE(0x422C, 0x1321, iwl6000i_2agn_cfg)},
        {IWL_PCI_DEVICE(0x422C, 0x1326, iwl6000i_2abg_cfg)},
        {IWL_PCI_DEVICE(0x4238, 0x1111, iwl6000_3agn_cfg)},
        {IWL_PCI_DEVICE(0x4239, 0x1311, iwl6000i_2agn_cfg)},
        {IWL_PCI_DEVICE(0x4239, 0x1316, iwl6000i_2abg_cfg)},

/* 6x05 Series */
        {IWL_PCI_DEVICE(0x0082, 0x1301, iwl6005_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1306, iwl6005_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1307, iwl6005_2bg_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1321, iwl6005_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1326, iwl6005_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0085, 0x1311, iwl6005_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0085, 0x1316, iwl6005_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0xC020, iwl6005_2agn_sff_cfg)},
        {IWL_PCI_DEVICE(0x0085, 0xC220, iwl6005_2agn_sff_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1341, iwl6005_2agn_d_cfg)},
        {IWL_PCI_DEVICE(0x0082, 0x1304, iwl6005_2agn_cfg)},/* low 5GHz active */
        {IWL_PCI_DEVICE(0x0082, 0x1305, iwl6005_2agn_cfg)},/* high 5GHz active */

/* 6x30 Series */
        {IWL_PCI_DEVICE(0x008A, 0x5305, iwl1030_bgn_cfg)},
        {IWL_PCI_DEVICE(0x008A, 0x5307, iwl1030_bg_cfg)},
        {IWL_PCI_DEVICE(0x008A, 0x5325, iwl1030_bgn_cfg)},
        {IWL_PCI_DEVICE(0x008A, 0x5327, iwl1030_bg_cfg)},
        {IWL_PCI_DEVICE(0x008B, 0x5315, iwl1030_bgn_cfg)},
        {IWL_PCI_DEVICE(0x008B, 0x5317, iwl1030_bg_cfg)},
        {IWL_PCI_DEVICE(0x0090, 0x5211, iwl6030_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0090, 0x5215, iwl6030_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0090, 0x5216, iwl6030_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5201, iwl6030_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5205, iwl6030_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5206, iwl6030_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5207, iwl6030_2bg_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5221, iwl6030_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5225, iwl6030_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0091, 0x5226, iwl6030_2abg_cfg)},

/* 6x50 WiFi/WiMax Series */
        {IWL_PCI_DEVICE(0x0087, 0x1301, iwl6050_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0087, 0x1306, iwl6050_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0087, 0x1321, iwl6050_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0087, 0x1326, iwl6050_2abg_cfg)},
        {IWL_PCI_DEVICE(0x0089, 0x1311, iwl6050_2agn_cfg)},
        {IWL_PCI_DEVICE(0x0089, 0x1316, iwl6050_2abg_cfg)},

/* 6150 WiFi/WiMax Series */
        {IWL_PCI_DEVICE(0x0885, 0x1305, iwl6150_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0885, 0x1307, iwl6150_bg_cfg)},
        {IWL_PCI_DEVICE(0x0885, 0x1325, iwl6150_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0885, 0x1327, iwl6150_bg_cfg)},
        {IWL_PCI_DEVICE(0x0886, 0x1315, iwl6150_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0886, 0x1317, iwl6150_bg_cfg)},

/* 1000 Series WiFi */
        {IWL_PCI_DEVICE(0x0083, 0x1205, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1305, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1225, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1325, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0084, 0x1215, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0084, 0x1315, iwl1000_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1206, iwl1000_bg_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1306, iwl1000_bg_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1226, iwl1000_bg_cfg)},
        {IWL_PCI_DEVICE(0x0083, 0x1326, iwl1000_bg_cfg)},
        {IWL_PCI_DEVICE(0x0084, 0x1216, iwl1000_bg_cfg)},
        {IWL_PCI_DEVICE(0x0084, 0x1316, iwl1000_bg_cfg)},

/* 100 Series WiFi */
        {IWL_PCI_DEVICE(0x08AE, 0x1005, iwl100_bgn_cfg)},
        {IWL_PCI_DEVICE(0x08AE, 0x1007, iwl100_bg_cfg)},
        {IWL_PCI_DEVICE(0x08AF, 0x1015, iwl100_bgn_cfg)},
        {IWL_PCI_DEVICE(0x08AF, 0x1017, iwl100_bg_cfg)},
        {IWL_PCI_DEVICE(0x08AE, 0x1025, iwl100_bgn_cfg)},
        {IWL_PCI_DEVICE(0x08AE, 0x1027, iwl100_bg_cfg)},

/* 130 Series WiFi */
        {IWL_PCI_DEVICE(0x0896, 0x5005, iwl130_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0896, 0x5007, iwl130_bg_cfg)},
        {IWL_PCI_DEVICE(0x0897, 0x5015, iwl130_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0897, 0x5017, iwl130_bg_cfg)},
        {IWL_PCI_DEVICE(0x0896, 0x5025, iwl130_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0896, 0x5027, iwl130_bg_cfg)},

/* 2x00 Series */
        {IWL_PCI_DEVICE(0x0890, 0x4022, iwl2000_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0891, 0x4222, iwl2000_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0890, 0x4422, iwl2000_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0890, 0x4822, iwl2000_2bgn_d_cfg)},

/* 2x30 Series */
        {IWL_PCI_DEVICE(0x0887, 0x4062, iwl2030_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0888, 0x4262, iwl2030_2bgn_cfg)},
        {IWL_PCI_DEVICE(0x0887, 0x4462, iwl2030_2bgn_cfg)},

/* 6x35 Series */
        {IWL_PCI_DEVICE(0x088E, 0x4060, iwl6035_2agn_cfg)},
        {IWL_PCI_DEVICE(0x088F, 0x4260, iwl6035_2agn_cfg)},
        {IWL_PCI_DEVICE(0x088E, 0x4460, iwl6035_2agn_cfg)},

/* 105 Series */
        {IWL_PCI_DEVICE(0x0894, 0x0022, iwl105_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0895, 0x0222, iwl105_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0894, 0x0422, iwl105_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0894, 0x0822, iwl105_bgn_d_cfg)},

/* 135 Series */
        {IWL_PCI_DEVICE(0x0892, 0x0062, iwl135_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0893, 0x0262, iwl135_bgn_cfg)},
        {IWL_PCI_DEVICE(0x0892, 0x0462, iwl135_bgn_cfg)},

        {0}
};
MODULE_DEVICE_TABLE(pci, iwl_hw_card_ids);

static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct iwl_cfg *cfg = (struct iwl_cfg *)(ent->driver_data);
        struct iwl_bus *bus;
        struct iwl_pci_bus *pci_bus;
        u16 pci_cmd;
        int err;

        bus = kzalloc(sizeof(*bus) + sizeof(*pci_bus), GFP_KERNEL);
        if (!bus) {
                dev_printk(KERN_ERR, &pdev->dev,
                           "Couldn't allocate iwl_pci_bus");
                err = -ENOMEM;
                goto out_no_pci;
        }

        pci_bus = IWL_BUS_GET_PCI_BUS(bus);
        pci_bus->pci_dev = pdev;

        pci_set_drvdata(pdev, bus);

        /* W/A - seems to solve weird behavior. We need to remove this if we
         * don't want to stay in L1 all the time. This wastes a lot of power */
        pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |
                                PCIE_LINK_STATE_CLKPM);

        if (pci_enable_device(pdev)) {
                err = -ENODEV;
                goto out_no_pci;
        }

        pci_set_master(pdev);

        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
        if (!err)
                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(36));
        if (err) {
                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
                if (!err)
                        err = pci_set_consistent_dma_mask(pdev,
                                                        DMA_BIT_MASK(32));
                /* both attempts failed: */
                if (err) {
                        dev_printk(KERN_ERR, bus->dev,
                                   "No suitable DMA available.\n");
                        goto out_pci_disable_device;
                }
        }

        err = pci_request_regions(pdev, DRV_NAME);
        if (err) {
                dev_printk(KERN_ERR, bus->dev, "pci_request_regions failed");
                goto out_pci_disable_device;
        }

        pci_bus->hw_base = pci_iomap(pdev, 0, 0);
        if (!pci_bus->hw_base) {
                dev_printk(KERN_ERR, bus->dev, "pci_iomap failed");
                err = -ENODEV;
                goto out_pci_release_regions;
        }

        dev_printk(KERN_INFO, &pdev->dev,
                "pci_resource_len = 0x%08llx\n",
                (unsigned long long) pci_resource_len(pdev, 0));
        dev_printk(KERN_INFO, &pdev->dev,
                "pci_resource_base = %p\n", pci_bus->hw_base);

        dev_printk(KERN_INFO, &pdev->dev,
                "HW Revision ID = 0x%X\n", pdev->revision);

        /* We disable the RETRY_TIMEOUT register (0x41) to keep
         * PCI Tx retries from interfering with C3 CPU state */
        pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);

        err = pci_enable_msi(pdev);
        if (err)
                dev_printk(KERN_ERR, &pdev->dev,
                        "pci_enable_msi failed(0X%x)", err);

        /* TODO: Move this away, not needed if not MSI */
        /* enable rfkill interrupt: hw bug w/a */
        pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
        if (pci_cmd & PCI_COMMAND_INTX_DISABLE) {
                pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
                pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
        }

        bus->dev = &pdev->dev;
        bus->irq = pdev->irq;
        bus->ops = &bus_ops_pci;

        err = iwl_probe(bus, &trans_ops_pcie, cfg);
        if (err)
                goto out_disable_msi;
        return 0;

out_disable_msi:
        pci_disable_msi(pdev);
        pci_iounmap(pdev, pci_bus->hw_base);
out_pci_release_regions:
        pci_set_drvdata(pdev, NULL);
        pci_release_regions(pdev);
out_pci_disable_device:
        pci_disable_device(pdev);
out_no_pci:
        kfree(bus);
        return err;
}

static void __devexit iwl_pci_remove(struct pci_dev *pdev)
{
        struct iwl_bus *bus = pci_get_drvdata(pdev);
        struct iwl_pci_bus *pci_bus = IWL_BUS_GET_PCI_BUS(bus);
        struct pci_dev *pci_dev = IWL_BUS_GET_PCI_DEV(bus);
        struct iwl_shared *shrd = bus->shrd;

        iwl_remove(shrd->priv);

        pci_disable_msi(pci_dev);
        pci_iounmap(pci_dev, pci_bus->hw_base);
        pci_release_regions(pci_dev);
        pci_disable_device(pci_dev);
        pci_set_drvdata(pci_dev, NULL);

        kfree(bus);
}

#ifdef CONFIG_PM_SLEEP

static int iwl_pci_suspend(struct device *device)
{
        struct pci_dev *pdev = to_pci_dev(device);
        struct iwl_bus *bus = pci_get_drvdata(pdev);
        struct iwl_shared *shrd = bus->shrd;

        /* Before you put code here, think about WoWLAN. You cannot check here
         * whether WoWLAN is enabled or not, and your code will run even if
         * WoWLAN is enabled - don't kill the NIC, someone may need it in Sx.
         */

        return iwl_trans_suspend(shrd->trans);
}

static int iwl_pci_resume(struct device *device)
{
        struct pci_dev *pdev = to_pci_dev(device);
        struct iwl_bus *bus = pci_get_drvdata(pdev);
        struct iwl_shared *shrd = bus->shrd;

        /* Before you put code here, think about WoWLAN. You cannot check here
         * whether WoWLAN is enabled or not, and your code will run even if
         * WoWLAN is enabled - the NIC may be alive.
         */

        /*
         * We disable the RETRY_TIMEOUT register (0x41) to keep
         * PCI Tx retries from interfering with C3 CPU state.
         */
        pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);

        return iwl_trans_resume(shrd->trans);
}

static SIMPLE_DEV_PM_OPS(iwl_dev_pm_ops, iwl_pci_suspend, iwl_pci_resume);

#define IWL_PM_OPS      (&iwl_dev_pm_ops)

#else

#define IWL_PM_OPS      NULL

#endif

static struct pci_driver iwl_pci_driver = {
        .name = DRV_NAME,
        .id_table = iwl_hw_card_ids,
        .probe = iwl_pci_probe,
        .remove = __devexit_p(iwl_pci_remove),
        .driver.pm = IWL_PM_OPS,
};

int __must_check iwl_pci_register_driver(void)
{
        int ret;
        ret = pci_register_driver(&iwl_pci_driver);
        if (ret)
                pr_err("Unable to initialize PCI module\n");

        return ret;
}

void iwl_pci_unregister_driver(void)
{
        pci_unregister_driver(&iwl_pci_driver);
}