/******************************************************************************
 *
 * 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 - 2013 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 COPYING.
 *
 * 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 - 2013 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/pci.h>
#include <linux/pci-aspm.h>
#include <linux/interrupt.h>
#include <linux/debugfs.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/gfp.h>

#include "iwl-drv.h"
#include "iwl-trans.h"
#include "iwl-csr.h"
#include "iwl-prph.h"
#include "iwl-agn-hw.h"
#include "internal.h"

static void __iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans,
                                                  u32 reg, u32 mask, u32 value)
{
        u32 v;

#ifdef CONFIG_IWLWIFI_DEBUG
        WARN_ON_ONCE(value & ~mask);
#endif

        v = iwl_read32(trans, reg);
        v &= ~mask;
        v |= value;
        iwl_write32(trans, reg, v);
}

static inline void __iwl_trans_pcie_clear_bit(struct iwl_trans *trans,
                                              u32 reg, u32 mask)
{
        __iwl_trans_pcie_set_bits_mask(trans, reg, mask, 0);
}

static inline void __iwl_trans_pcie_set_bit(struct iwl_trans *trans,
                                            u32 reg, u32 mask)
{
        __iwl_trans_pcie_set_bits_mask(trans, reg, mask, mask);
}

static void iwl_pcie_set_pwr(struct iwl_trans *trans, bool vaux)
{
        if (vaux && pci_pme_capable(to_pci_dev(trans->dev), PCI_D3cold))
                iwl_set_bits_mask_prph(trans, APMG_PS_CTRL_REG,
                                       APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
                                       ~APMG_PS_CTRL_MSK_PWR_SRC);
        else
                iwl_set_bits_mask_prph(trans, APMG_PS_CTRL_REG,
                                       APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
                                       ~APMG_PS_CTRL_MSK_PWR_SRC);
}

/* PCI registers */
#define PCI_CFG_RETRY_TIMEOUT   0x041

static void iwl_pcie_apm_config(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u16 lctl;

        /*
         * 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.
         */
        pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_LNKCTL, &lctl);
        if (lctl & PCI_EXP_LNKCTL_ASPM_L1) {
                /* L1-ASPM enabled; disable(!) L0S */
                iwl_set_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
                dev_info(trans->dev, "L1 Enabled; Disabling L0S\n");
        } else {
                /* L1-ASPM disabled; enable(!) L0S */
                iwl_clear_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
                dev_info(trans->dev, "L1 Disabled; Enabling L0S\n");
        }
        trans->pm_support = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
}

/*
 * Start up NIC's basic functionality after it has been reset
 * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop())
 * NOTE:  This does not load uCode nor start the embedded processor
 */
static int iwl_pcie_apm_init(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int ret = 0;
        IWL_DEBUG_INFO(trans, "Init card's basic functions\n");

        /*
         * Use "set_bit" below rather than "write", to preserve any hardware
         * bits already set by default after reset.
         */

        /* Disable L0S exit timer (platform NMI Work/Around) */
        iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
                    CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);

        /*
         * Disable L0s without affecting L1;
         *  don't wait for ICH L0s (ICH bug W/A)
         */
        iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
                    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);

        /* Set FH wait threshold to maximum (HW error during stress W/A) */
        iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);

        /*
         * Enable HAP INTA (interrupt from management bus) to
         * wake device's PCI Express link L1a -> L0s
         */
        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);

        iwl_pcie_apm_config(trans);

        /* Configure analog phase-lock-loop before activating to D0A */
        if (trans->cfg->base_params->pll_cfg_val)
                iwl_set_bit(trans, CSR_ANA_PLL_CFG,
                            trans->cfg->base_params->pll_cfg_val);

        /*
         * Set "initialization complete" bit to move adapter from
         * D0U* --> D0A* (powered-up active) state.
         */
        iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

        /*
         * Wait for clock stabilization; once stabilized, access to
         * device-internal resources is supported, e.g. iwl_write_prph()
         * and accesses to uCode SRAM.
         */
        ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
        if (ret < 0) {
                IWL_DEBUG_INFO(trans, "Failed to init the card\n");
                goto out;
        }

        /*
         * Enable DMA clock and wait for it to stabilize.
         *
         * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
         * do not disable clocks.  This preserves any hardware bits already
         * set by default in "CLK_CTRL_REG" after reset.
         */
        iwl_write_prph(trans, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
        udelay(20);

        /* Disable L1-Active */
        iwl_set_bits_prph(trans, APMG_PCIDEV_STT_REG,
                          APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

        set_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);

out:
        return ret;
}

static int iwl_pcie_apm_stop_master(struct iwl_trans *trans)
{
        int ret = 0;

        /* stop device's busmaster DMA activity */
        iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

        ret = iwl_poll_bit(trans, CSR_RESET,
                           CSR_RESET_REG_FLAG_MASTER_DISABLED,
                           CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
        if (ret)
                IWL_WARN(trans, "Master Disable Timed Out, 100 usec\n");

        IWL_DEBUG_INFO(trans, "stop master\n");

        return ret;
}

static void iwl_pcie_apm_stop(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n");

        clear_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);

        /* Stop device's DMA activity */
        iwl_pcie_apm_stop_master(trans);

        /* Reset the entire device */
        iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

        udelay(10);

        /*
         * Clear "initialization complete" bit to move adapter from
         * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
         */
        iwl_clear_bit(trans, CSR_GP_CNTRL,
                      CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
}

static int iwl_pcie_nic_init(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long flags;

        /* nic_init */
        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_pcie_apm_init(trans);

        /* Set interrupt coalescing calibration timer to default (512 usecs) */
        iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);

        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        iwl_pcie_set_pwr(trans, false);

        iwl_op_mode_nic_config(trans->op_mode);

        /* Allocate the RX queue, or reset if it is already allocated */
        iwl_pcie_rx_init(trans);

        /* Allocate or reset and init all Tx and Command queues */
        if (iwl_pcie_tx_init(trans))
                return -ENOMEM;

        if (trans->cfg->base_params->shadow_reg_enable) {
                /* enable shadow regs in HW */
                iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF);
                IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n");
        }

        return 0;
}

#define HW_READY_TIMEOUT (50)

/* Note: returns poll_bit return value, which is >= 0 if success */
static int iwl_pcie_set_hw_ready(struct iwl_trans *trans)
{
        int ret;

        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_BIT_NIC_READY);

        /* See if we got it */
        ret = iwl_poll_bit(trans, CSR_HW_IF_CONFIG_REG,
                           CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                           CSR_HW_IF_CONFIG_REG_BIT_NIC_READY,
                           HW_READY_TIMEOUT);

        IWL_DEBUG_INFO(trans, "hardware%s ready\n", ret < 0 ? " not" : "");
        return ret;
}

/* Note: returns standard 0/-ERROR code */
static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
{
        int ret;
        int t = 0;

        IWL_DEBUG_INFO(trans, "iwl_trans_prepare_card_hw enter\n");

        ret = iwl_pcie_set_hw_ready(trans);
        /* If the card is ready, exit 0 */
        if (ret >= 0)
                return 0;

        /* If HW is not ready, prepare the conditions to check again */
        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_PREPARE);

        do {
                ret = iwl_pcie_set_hw_ready(trans);
                if (ret >= 0)
                        return 0;

                usleep_range(200, 1000);
                t += 200;
        } while (t < 150000);

        return ret;
}

/*
 * ucode
 */
static int iwl_pcie_load_firmware_chunk(struct iwl_trans *trans, u32 dst_addr,
                                   dma_addr_t phy_addr, u32 byte_cnt)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int ret;

        trans_pcie->ucode_write_complete = false;

        iwl_write_direct32(trans,
                           FH_TCSR_CHNL_TX_CONFIG_REG(FH_SRVC_CHNL),
                           FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_PAUSE);

        iwl_write_direct32(trans,
                           FH_SRVC_CHNL_SRAM_ADDR_REG(FH_SRVC_CHNL),
                           dst_addr);

        iwl_write_direct32(trans,
                           FH_TFDIB_CTRL0_REG(FH_SRVC_CHNL),
                           phy_addr & FH_MEM_TFDIB_DRAM_ADDR_LSB_MSK);

        iwl_write_direct32(trans,
                           FH_TFDIB_CTRL1_REG(FH_SRVC_CHNL),
                           (iwl_get_dma_hi_addr(phy_addr)
                                << FH_MEM_TFDIB_REG1_ADDR_BITSHIFT) | byte_cnt);

        iwl_write_direct32(trans,
                           FH_TCSR_CHNL_TX_BUF_STS_REG(FH_SRVC_CHNL),
                           1 << FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_NUM |
                           1 << FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_IDX |
                           FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_VALID);

        iwl_write_direct32(trans,
                           FH_TCSR_CHNL_TX_CONFIG_REG(FH_SRVC_CHNL),
                           FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE    |
                           FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_DISABLE |
                           FH_TCSR_TX_CONFIG_REG_VAL_CIRQ_HOST_ENDTFD);

        ret = wait_event_timeout(trans_pcie->ucode_write_waitq,
                                 trans_pcie->ucode_write_complete, 5 * HZ);
        if (!ret) {
                IWL_ERR(trans, "Failed to load firmware chunk!\n");
                return -ETIMEDOUT;
        }

        return 0;
}

static int iwl_pcie_load_section(struct iwl_trans *trans, u8 section_num,
                            const struct fw_desc *section)
{
        u8 *v_addr;
        dma_addr_t p_addr;
        u32 offset;
        int ret = 0;

        IWL_DEBUG_FW(trans, "[%d] uCode section being loaded...\n",
                     section_num);

        v_addr = dma_alloc_coherent(trans->dev, PAGE_SIZE, &p_addr, GFP_KERNEL);
        if (!v_addr)
                return -ENOMEM;

        for (offset = 0; offset < section->len; offset += PAGE_SIZE) {
                u32 copy_size;

                copy_size = min_t(u32, PAGE_SIZE, section->len - offset);

                memcpy(v_addr, (u8 *)section->data + offset, copy_size);
                ret = iwl_pcie_load_firmware_chunk(trans,
                                                   section->offset + offset,
                                                   p_addr, copy_size);
                if (ret) {
                        IWL_ERR(trans,
                                "Could not load the [%d] uCode section\n",
                                section_num);
                        break;
                }
        }

        dma_free_coherent(trans->dev, PAGE_SIZE, v_addr, p_addr);
        return ret;
}

static int iwl_pcie_load_given_ucode(struct iwl_trans *trans,
                                const struct fw_img *image)
{
        int i, ret = 0;

        for (i = 0; i < IWL_UCODE_SECTION_MAX; i++) {
                if (!image->sec[i].data)
                        break;

                ret = iwl_pcie_load_section(trans, i, &image->sec[i]);
                if (ret)
                        return ret;
        }

        /* Remove all resets to allow NIC to operate */
        iwl_write32(trans, CSR_RESET, 0);

        return 0;
}

static int iwl_trans_pcie_start_fw(struct iwl_trans *trans,
                                   const struct fw_img *fw, bool run_in_rfkill)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int ret;
        bool hw_rfkill;

        /* This may fail if AMT took ownership of the device */
        if (iwl_pcie_prepare_card_hw(trans)) {
                IWL_WARN(trans, "Exit HW not ready\n");
                return -EIO;
        }

        clear_bit(STATUS_FW_ERROR, &trans_pcie->status);

        iwl_enable_rfkill_int(trans);

        /* If platform's RF_KILL switch is NOT set to KILL */
        hw_rfkill = iwl_is_rfkill_set(trans);
        if (hw_rfkill)
                set_bit(STATUS_RFKILL, &trans_pcie->status);
        else
                clear_bit(STATUS_RFKILL, &trans_pcie->status);
        iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
        if (hw_rfkill && !run_in_rfkill)
                return -ERFKILL;

        iwl_write32(trans, CSR_INT, 0xFFFFFFFF);

        ret = iwl_pcie_nic_init(trans);
        if (ret) {
                IWL_ERR(trans, "Unable to init nic\n");
                return ret;
        }

        /* make sure rfkill handshake bits are cleared */
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

        /* clear (again), then enable host interrupts */
        iwl_write32(trans, CSR_INT, 0xFFFFFFFF);
        iwl_enable_interrupts(trans);

        /* really make sure rfkill handshake bits are cleared */
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);

        /* Load the given image to the HW */
        return iwl_pcie_load_given_ucode(trans, fw);
}

static void iwl_trans_pcie_fw_alive(struct iwl_trans *trans, u32 scd_addr)
{
        iwl_pcie_reset_ict(trans);
        iwl_pcie_tx_start(trans, scd_addr);
}

static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long flags;

        /* tell the device to stop sending interrupts */
        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_disable_interrupts(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        /* device going down, Stop using ICT table */
        iwl_pcie_disable_ict(trans);

        /*
         * If a HW restart happens during firmware loading,
         * then the firmware loading might call this function
         * and later it might be called again due to the
         * restart. So don't process again if the device is
         * already dead.
         */
        if (test_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status)) {
                iwl_pcie_tx_stop(trans);
                iwl_pcie_rx_stop(trans);

                /* Power-down device's busmaster DMA clocks */
                iwl_write_prph(trans, APMG_CLK_DIS_REG,
                               APMG_CLK_VAL_DMA_CLK_RQT);
                udelay(5);
        }

        /* Make sure (redundant) we've released our request to stay awake */
        iwl_clear_bit(trans, CSR_GP_CNTRL,
                      CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

        /* Stop the device, and put it in low power state */
        iwl_pcie_apm_stop(trans);

        /* Upon stop, the APM issues an interrupt if HW RF kill is set.
         * Clean again the interrupt here
         */
        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_disable_interrupts(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        iwl_enable_rfkill_int(trans);

        /* stop and reset the on-board processor */
        iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);

        /* clear all status bits */
        clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status);
        clear_bit(STATUS_INT_ENABLED, &trans_pcie->status);
        clear_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);
        clear_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
        clear_bit(STATUS_RFKILL, &trans_pcie->status);
}

static void iwl_trans_pcie_d3_suspend(struct iwl_trans *trans)
{
        /* let the ucode operate on its own */
        iwl_write32(trans, CSR_UCODE_DRV_GP1_SET,
                    CSR_UCODE_DRV_GP1_BIT_D3_CFG_COMPLETE);

        iwl_disable_interrupts(trans);
        iwl_pcie_disable_ict(trans);

        iwl_clear_bit(trans, CSR_GP_CNTRL,
                      CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        iwl_clear_bit(trans, CSR_GP_CNTRL,
                      CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

        /*
         * reset TX queues -- some of their registers reset during S3
         * so if we don't reset everything here the D3 image would try
         * to execute some invalid memory upon resume
         */
        iwl_trans_pcie_tx_reset(trans);

        iwl_pcie_set_pwr(trans, true);
}

static int iwl_trans_pcie_d3_resume(struct iwl_trans *trans,
                                    enum iwl_d3_status *status)
{
        u32 val;
        int ret;

        iwl_pcie_set_pwr(trans, false);

        val = iwl_read32(trans, CSR_RESET);
        if (val & CSR_RESET_REG_FLAG_NEVO_RESET) {
                *status = IWL_D3_STATUS_RESET;
                return 0;
        }

        /*
         * Also enables interrupts - none will happen as the device doesn't
         * know we're waking it up, only when the opmode actually tells it
         * after this call.
         */
        iwl_pcie_reset_ict(trans);

        iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        iwl_set_bit(trans, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

        ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
                           25000);
        if (ret) {
                IWL_ERR(trans, "Failed to resume the device (mac ready)\n");
                return ret;
        }

        iwl_trans_pcie_tx_reset(trans);

        ret = iwl_pcie_rx_init(trans);
        if (ret) {
                IWL_ERR(trans, "Failed to resume the device (RX reset)\n");
                return ret;
        }

        iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR,
                    CSR_UCODE_DRV_GP1_BIT_D3_CFG_COMPLETE);

        *status = IWL_D3_STATUS_ALIVE;
        return 0;
}

static int iwl_trans_pcie_start_hw(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        bool hw_rfkill;
        int err;

        err = iwl_pcie_prepare_card_hw(trans);
        if (err) {
                IWL_ERR(trans, "Error while preparing HW: %d\n", err);
                return err;
        }

        iwl_pcie_apm_init(trans);

        /* From now on, the op_mode will be kept updated about RF kill state */
        iwl_enable_rfkill_int(trans);

        hw_rfkill = iwl_is_rfkill_set(trans);
        if (hw_rfkill)
                set_bit(STATUS_RFKILL, &trans_pcie->status);
        else
                clear_bit(STATUS_RFKILL, &trans_pcie->status);
        iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);

        return 0;
}

static void iwl_trans_pcie_stop_hw(struct iwl_trans *trans,
                                   bool op_mode_leaving)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        bool hw_rfkill;
        unsigned long flags;

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_disable_interrupts(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        iwl_pcie_apm_stop(trans);

        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_disable_interrupts(trans);
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);

        iwl_pcie_disable_ict(trans);

        if (!op_mode_leaving) {
                /*
                 * Even if we stop the HW, we still want the RF kill
                 * interrupt
                 */
                iwl_enable_rfkill_int(trans);

                /*
                 * Check again since the RF kill state may have changed while
                 * all the interrupts were disabled, in this case we couldn't
                 * receive the RF kill interrupt and update the state in the
                 * op_mode.
                 */
                hw_rfkill = iwl_is_rfkill_set(trans);
                if (hw_rfkill)
                        set_bit(STATUS_RFKILL, &trans_pcie->status);
                else
                        clear_bit(STATUS_RFKILL, &trans_pcie->status);
                iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
        }
}

static void iwl_trans_pcie_write8(struct iwl_trans *trans, u32 ofs, u8 val)
{
        writeb(val, IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
}

static void iwl_trans_pcie_write32(struct iwl_trans *trans, u32 ofs, u32 val)
{
        writel(val, IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
}

static u32 iwl_trans_pcie_read32(struct iwl_trans *trans, u32 ofs)
{
        return readl(IWL_TRANS_GET_PCIE_TRANS(trans)->hw_base + ofs);
}

static u32 iwl_trans_pcie_read_prph(struct iwl_trans *trans, u32 reg)
{
        iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_RADDR,
                               ((reg & 0x000FFFFF) | (3 << 24)));
        return iwl_trans_pcie_read32(trans, HBUS_TARG_PRPH_RDAT);
}

static void iwl_trans_pcie_write_prph(struct iwl_trans *trans, u32 addr,
                                      u32 val)
{
        iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_WADDR,
                               ((addr & 0x000FFFFF) | (3 << 24)));
        iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_WDAT, val);
}

static void iwl_trans_pcie_configure(struct iwl_trans *trans,
                                     const struct iwl_trans_config *trans_cfg)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        trans_pcie->cmd_queue = trans_cfg->cmd_queue;
        trans_pcie->cmd_fifo = trans_cfg->cmd_fifo;
        if (WARN_ON(trans_cfg->n_no_reclaim_cmds > MAX_NO_RECLAIM_CMDS))
                trans_pcie->n_no_reclaim_cmds = 0;
        else
                trans_pcie->n_no_reclaim_cmds = trans_cfg->n_no_reclaim_cmds;
        if (trans_pcie->n_no_reclaim_cmds)
                memcpy(trans_pcie->no_reclaim_cmds, trans_cfg->no_reclaim_cmds,
                       trans_pcie->n_no_reclaim_cmds * sizeof(u8));

        trans_pcie->rx_buf_size_8k = trans_cfg->rx_buf_size_8k;
        if (trans_pcie->rx_buf_size_8k)
                trans_pcie->rx_page_order = get_order(8 * 1024);
        else
                trans_pcie->rx_page_order = get_order(4 * 1024);

        trans_pcie->wd_timeout =
                msecs_to_jiffies(trans_cfg->queue_watchdog_timeout);

        trans_pcie->command_names = trans_cfg->command_names;
        trans_pcie->bc_table_dword = trans_cfg->bc_table_dword;
}

void iwl_trans_pcie_free(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        synchronize_irq(trans_pcie->pci_dev->irq);

        iwl_pcie_tx_free(trans);
        iwl_pcie_rx_free(trans);

        free_irq(trans_pcie->pci_dev->irq, trans);
        iwl_pcie_free_ict(trans);

        pci_disable_msi(trans_pcie->pci_dev);
        iounmap(trans_pcie->hw_base);
        pci_release_regions(trans_pcie->pci_dev);
        pci_disable_device(trans_pcie->pci_dev);
        kmem_cache_destroy(trans->dev_cmd_pool);

        kfree(trans);
}

static void iwl_trans_pcie_set_pmi(struct iwl_trans *trans, bool state)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        if (state)
                set_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
        else
                clear_bit(STATUS_TPOWER_PMI, &trans_pcie->status);
}

#ifdef CONFIG_PM_SLEEP
static int iwl_trans_pcie_suspend(struct iwl_trans *trans)
{
        return 0;
}

static int iwl_trans_pcie_resume(struct iwl_trans *trans)
{
        bool hw_rfkill;

        iwl_enable_rfkill_int(trans);

        hw_rfkill = iwl_is_rfkill_set(trans);
        iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);

        return 0;
}
#endif /* CONFIG_PM_SLEEP */

static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans, bool silent,
                                                unsigned long *flags)
{
        int ret;
        struct iwl_trans_pcie *pcie_trans = IWL_TRANS_GET_PCIE_TRANS(trans);
        spin_lock_irqsave(&pcie_trans->reg_lock, *flags);

        /* this bit wakes up the NIC */
        __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
                                 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

        /*
         * These bits say the device is running, and should keep running for
         * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
         * but they do not indicate that embedded SRAM is restored yet;
         * 3945 and 4965 have volatile SRAM, and must save/restore contents
         * to/from host DRAM when sleeping/waking for power-saving.
         * Each direction takes approximately 1/4 millisecond; with this
         * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
         * series of register accesses are expected (e.g. reading Event Log),
         * to keep device from sleeping.
         *
         * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
         * SRAM is okay/restored.  We don't check that here because this call
         * is just for hardware register access; but GP1 MAC_SLEEP check is a
         * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
         *
         * 5000 series and later (including 1000 series) have non-volatile SRAM,
         * and do not save/restore SRAM when power cycling.
         */
        ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
                           CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
                           (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
                            CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
        if (unlikely(ret < 0)) {
                iwl_write32(trans, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
                if (!silent) {
                        u32 val = iwl_read32(trans, CSR_GP_CNTRL);
                        WARN_ONCE(1,
                                  "Timeout waiting for hardware access (CSR_GP_CNTRL 0x%08x)\n",
                                  val);
                        spin_unlock_irqrestore(&pcie_trans->reg_lock, *flags);
                        return false;
                }
        }

        /*
         * Fool sparse by faking we release the lock - sparse will
         * track nic_access anyway.
         */
        __release(&pcie_trans->reg_lock);
        return true;
}

static void iwl_trans_pcie_release_nic_access(struct iwl_trans *trans,
                                              unsigned long *flags)
{
        struct iwl_trans_pcie *pcie_trans = IWL_TRANS_GET_PCIE_TRANS(trans);

        lockdep_assert_held(&pcie_trans->reg_lock);

        /*
         * Fool sparse by faking we acquiring the lock - sparse will
         * track nic_access anyway.
         */
        __acquire(&pcie_trans->reg_lock);

        __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
                                   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        /*
         * Above we read the CSR_GP_CNTRL register, which will flush
         * any previous writes, but we need the write that clears the
         * MAC_ACCESS_REQ bit to be performed before any other writes
         * scheduled on different CPUs (after we drop reg_lock).
         */
        mmiowb();
        spin_unlock_irqrestore(&pcie_trans->reg_lock, *flags);
}

static int iwl_trans_pcie_read_mem(struct iwl_trans *trans, u32 addr,
                                   void *buf, int dwords)
{
        unsigned long flags;
        int offs, ret = 0;
        u32 *vals = buf;

        if (iwl_trans_grab_nic_access(trans, false, &flags)) {
                iwl_write32(trans, HBUS_TARG_MEM_RADDR, addr);
                for (offs = 0; offs < dwords; offs++)
                        vals[offs] = iwl_read32(trans, HBUS_TARG_MEM_RDAT);
                iwl_trans_release_nic_access(trans, &flags);
        } else {
                ret = -EBUSY;
        }
        return ret;
}

static int iwl_trans_pcie_write_mem(struct iwl_trans *trans, u32 addr,
                                    void *buf, int dwords)
{
        unsigned long flags;
        int offs, ret = 0;
        u32 *vals = buf;

        if (iwl_trans_grab_nic_access(trans, false, &flags)) {
                iwl_write32(trans, HBUS_TARG_MEM_WADDR, addr);
                for (offs = 0; offs < dwords; offs++)
                        iwl_write32(trans, HBUS_TARG_MEM_WDAT,
                                    vals ? vals[offs] : 0);
                iwl_trans_release_nic_access(trans, &flags);
        } else {
                ret = -EBUSY;
        }
        return ret;
}

#define IWL_FLUSH_WAIT_MS       2000

static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_txq *txq;
        struct iwl_queue *q;
        int cnt;
        unsigned long now = jiffies;
        u32 scd_sram_addr;
        u8 buf[16];
        int ret = 0;

        /* waiting for all the tx frames complete might take a while */
        for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
                if (cnt == trans_pcie->cmd_queue)
                        continue;
                txq = &trans_pcie->txq[cnt];
                q = &txq->q;
                while (q->read_ptr != q->write_ptr && !time_after(jiffies,
                       now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS)))
                        msleep(1);

                if (q->read_ptr != q->write_ptr) {
                        IWL_ERR(trans,
                                "fail to flush all tx fifo queues Q %d\n", cnt);
                        ret = -ETIMEDOUT;
                        break;
                }
        }

        if (!ret)
                return 0;

        IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n",
                txq->q.read_ptr, txq->q.write_ptr);

        scd_sram_addr = trans_pcie->scd_base_addr +
                        SCD_TX_STTS_QUEUE_OFFSET(txq->q.id);
        iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf));

        iwl_print_hex_error(trans, buf, sizeof(buf));

        for (cnt = 0; cnt < FH_TCSR_CHNL_NUM; cnt++)
                IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", cnt,
                        iwl_read_direct32(trans, FH_TX_TRB_REG(cnt)));

        for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
                u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(cnt));
                u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
                bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));
                u32 tbl_dw =
                        iwl_trans_read_mem32(trans, trans_pcie->scd_base_addr +
                                             SCD_TRANS_TBL_OFFSET_QUEUE(cnt));

                if (cnt & 0x1)
                        tbl_dw = (tbl_dw & 0xFFFF0000) >> 16;
                else
                        tbl_dw = tbl_dw & 0x0000FFFF;

                IWL_ERR(trans,
                        "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
                        cnt, active ? "" : "in", fifo, tbl_dw,

                        iwl_read_prph(trans,
                                      SCD_QUEUE_RDPTR(cnt)) & (txq->q.n_bd - 1),
                        iwl_read_prph(trans, SCD_QUEUE_WRPTR(cnt)));
        }

        return ret;
}

static void iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans, u32 reg,
                                         u32 mask, u32 value)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        unsigned long flags;

        spin_lock_irqsave(&trans_pcie->reg_lock, flags);
        __iwl_trans_pcie_set_bits_mask(trans, reg, mask, value);
        spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
}

static const char *get_fh_string(int cmd)
{
#define IWL_CMD(x) case x: return #x
        switch (cmd) {
        IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
        IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
        IWL_CMD(FH_RSCSR_CHNL0_WPTR);
        IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
        IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
        IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
        IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
        IWL_CMD(FH_TSSR_TX_STATUS_REG);
        IWL_CMD(FH_TSSR_TX_ERROR_REG);
        default:
                return "UNKNOWN";
        }
#undef IWL_CMD
}

int iwl_pcie_dump_fh(struct iwl_trans *trans, char **buf)
{
        int i;
        static const u32 fh_tbl[] = {
                FH_RSCSR_CHNL0_STTS_WPTR_REG,
                FH_RSCSR_CHNL0_RBDCB_BASE_REG,
                FH_RSCSR_CHNL0_WPTR,
                FH_MEM_RCSR_CHNL0_CONFIG_REG,
                FH_MEM_RSSR_SHARED_CTRL_REG,
                FH_MEM_RSSR_RX_STATUS_REG,
                FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
                FH_TSSR_TX_STATUS_REG,
                FH_TSSR_TX_ERROR_REG
        };

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (buf) {
                int pos = 0;
                size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;

                *buf = kmalloc(bufsz, GFP_KERNEL);
                if (!*buf)
                        return -ENOMEM;

                pos += scnprintf(*buf + pos, bufsz - pos,
                                "FH register values:\n");

                for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
                        pos += scnprintf(*buf + pos, bufsz - pos,
                                "  %34s: 0X%08x\n",
                                get_fh_string(fh_tbl[i]),
                                iwl_read_direct32(trans, fh_tbl[i]));

                return pos;
        }
#endif

        IWL_ERR(trans, "FH register values:\n");
        for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
                IWL_ERR(trans, "  %34s: 0X%08x\n",
                        get_fh_string(fh_tbl[i]),
                        iwl_read_direct32(trans, fh_tbl[i]));

        return 0;
}

static const char *get_csr_string(int cmd)
{
#define IWL_CMD(x) case x: return #x
        switch (cmd) {
        IWL_CMD(CSR_HW_IF_CONFIG_REG);
        IWL_CMD(CSR_INT_COALESCING);
        IWL_CMD(CSR_INT);
        IWL_CMD(CSR_INT_MASK);
        IWL_CMD(CSR_FH_INT_STATUS);
        IWL_CMD(CSR_GPIO_IN);
        IWL_CMD(CSR_RESET);
        IWL_CMD(CSR_GP_CNTRL);
        IWL_CMD(CSR_HW_REV);
        IWL_CMD(CSR_EEPROM_REG);
        IWL_CMD(CSR_EEPROM_GP);
        IWL_CMD(CSR_OTP_GP_REG);
        IWL_CMD(CSR_GIO_REG);
        IWL_CMD(CSR_GP_UCODE_REG);
        IWL_CMD(CSR_GP_DRIVER_REG);
        IWL_CMD(CSR_UCODE_DRV_GP1);
        IWL_CMD(CSR_UCODE_DRV_GP2);
        IWL_CMD(CSR_LED_REG);
        IWL_CMD(CSR_DRAM_INT_TBL_REG);
        IWL_CMD(CSR_GIO_CHICKEN_BITS);
        IWL_CMD(CSR_ANA_PLL_CFG);
        IWL_CMD(CSR_HW_REV_WA_REG);
        IWL_CMD(CSR_DBG_HPET_MEM_REG);
        default:
                return "UNKNOWN";
        }
#undef IWL_CMD
}

void iwl_pcie_dump_csr(struct iwl_trans *trans)
{
        int i;
        static const u32 csr_tbl[] = {
                CSR_HW_IF_CONFIG_REG,
                CSR_INT_COALESCING,
                CSR_INT,
                CSR_INT_MASK,
                CSR_FH_INT_STATUS,
                CSR_GPIO_IN,
                CSR_RESET,
                CSR_GP_CNTRL,
                CSR_HW_REV,
                CSR_EEPROM_REG,
                CSR_EEPROM_GP,
                CSR_OTP_GP_REG,
                CSR_GIO_REG,
                CSR_GP_UCODE_REG,
                CSR_GP_DRIVER_REG,
                CSR_UCODE_DRV_GP1,
                CSR_UCODE_DRV_GP2,
                CSR_LED_REG,
                CSR_DRAM_INT_TBL_REG,
                CSR_GIO_CHICKEN_BITS,
                CSR_ANA_PLL_CFG,
                CSR_HW_REV_WA_REG,
                CSR_DBG_HPET_MEM_REG
        };
        IWL_ERR(trans, "CSR values:\n");
        IWL_ERR(trans, "(2nd byte of CSR_INT_COALESCING is "
                "CSR_INT_PERIODIC_REG)\n");
        for (i = 0; i <  ARRAY_SIZE(csr_tbl); i++) {
                IWL_ERR(trans, "  %25s: 0X%08x\n",
                        get_csr_string(csr_tbl[i]),
                        iwl_read32(trans, csr_tbl[i]));
        }
}

#ifdef CONFIG_IWLWIFI_DEBUGFS
/* create and remove of files */
#define DEBUGFS_ADD_FILE(name, parent, mode) do {                       \
        if (!debugfs_create_file(#name, mode, parent, trans,            \
                                 &iwl_dbgfs_##name##_ops))              \
                goto err;                                               \
} while (0)

/* file operation */
#define DEBUGFS_READ_FUNC(name)                                         \
static ssize_t iwl_dbgfs_##name##_read(struct file *file,               \
                                        char __user *user_buf,          \
                                        size_t count, loff_t *ppos);

#define DEBUGFS_WRITE_FUNC(name)                                        \
static ssize_t iwl_dbgfs_##name##_write(struct file *file,              \
                                        const char __user *user_buf,    \
                                        size_t count, loff_t *ppos);

#define DEBUGFS_READ_FILE_OPS(name)                                     \
        DEBUGFS_READ_FUNC(name);                                        \
static const struct file_operations iwl_dbgfs_##name##_ops = {          \
        .read = iwl_dbgfs_##name##_read,                                \
        .open = simple_open,                                            \
        .llseek = generic_file_llseek,                                  \
};

#define DEBUGFS_WRITE_FILE_OPS(name)                                    \
        DEBUGFS_WRITE_FUNC(name);                                       \
static const struct file_operations iwl_dbgfs_##name##_ops = {          \
        .write = iwl_dbgfs_##name##_write,                              \
        .open = simple_open,                                            \
        .llseek = generic_file_llseek,                                  \
};

#define DEBUGFS_READ_WRITE_FILE_OPS(name)                               \
        DEBUGFS_READ_FUNC(name);                                        \
        DEBUGFS_WRITE_FUNC(name);                                       \
static const struct file_operations iwl_dbgfs_##name##_ops = {          \
        .write = iwl_dbgfs_##name##_write,                              \
        .read = iwl_dbgfs_##name##_read,                                \
        .open = simple_open,                                            \
        .llseek = generic_file_llseek,                                  \
};

static ssize_t iwl_dbgfs_tx_queue_read(struct file *file,
                                       char __user *user_buf,
                                       size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_txq *txq;
        struct iwl_queue *q;
        char *buf;
        int pos = 0;
        int cnt;
        int ret;
        size_t bufsz;

        bufsz = sizeof(char) * 64 * trans->cfg->base_params->num_of_queues;

        if (!trans_pcie->txq)
                return -EAGAIN;

        buf = kzalloc(bufsz, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) {
                txq = &trans_pcie->txq[cnt];
                q = &txq->q;
                pos += scnprintf(buf + pos, bufsz - pos,
                                "hwq %.2d: read=%u write=%u use=%d stop=%d\n",
                                cnt, q->read_ptr, q->write_ptr,
                                !!test_bit(cnt, trans_pcie->queue_used),
                                !!test_bit(cnt, trans_pcie->queue_stopped));
        }
        ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
        kfree(buf);
        return ret;
}

static ssize_t iwl_dbgfs_rx_queue_read(struct file *file,
                                       char __user *user_buf,
                                       size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        char buf[256];
        int pos = 0;
        const size_t bufsz = sizeof(buf);

        pos += scnprintf(buf + pos, bufsz - pos, "read: %u\n",
                                                rxq->read);
        pos += scnprintf(buf + pos, bufsz - pos, "write: %u\n",
                                                rxq->write);
        pos += scnprintf(buf + pos, bufsz - pos, "free_count: %u\n",
                                                rxq->free_count);
        if (rxq->rb_stts) {
                pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
                         le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF);
        } else {
                pos += scnprintf(buf + pos, bufsz - pos,
                                        "closed_rb_num: Not Allocated\n");
        }
        return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
}

static ssize_t iwl_dbgfs_interrupt_read(struct file *file,
                                        char __user *user_buf,
                                        size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct isr_statistics *isr_stats = &trans_pcie->isr_stats;

        int pos = 0;
        char *buf;
        int bufsz = 24 * 64; /* 24 items * 64 char per item */
        ssize_t ret;

        buf = kzalloc(bufsz, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        pos += scnprintf(buf + pos, bufsz - pos,
                        "Interrupt Statistics Report:\n");

        pos += scnprintf(buf + pos, bufsz - pos, "HW Error:\t\t\t %u\n",
                isr_stats->hw);
        pos += scnprintf(buf + pos, bufsz - pos, "SW Error:\t\t\t %u\n",
                isr_stats->sw);
        if (isr_stats->sw || isr_stats->hw) {
                pos += scnprintf(buf + pos, bufsz - pos,
                        "\tLast Restarting Code:  0x%X\n",
                        isr_stats->err_code);
        }
#ifdef CONFIG_IWLWIFI_DEBUG
        pos += scnprintf(buf + pos, bufsz - pos, "Frame transmitted:\t\t %u\n",
                isr_stats->sch);
        pos += scnprintf(buf + pos, bufsz - pos, "Alive interrupt:\t\t %u\n",
                isr_stats->alive);
#endif
        pos += scnprintf(buf + pos, bufsz - pos,
                "HW RF KILL switch toggled:\t %u\n", isr_stats->rfkill);

        pos += scnprintf(buf + pos, bufsz - pos, "CT KILL:\t\t\t %u\n",
                isr_stats->ctkill);

        pos += scnprintf(buf + pos, bufsz - pos, "Wakeup Interrupt:\t\t %u\n",
                isr_stats->wakeup);

        pos += scnprintf(buf + pos, bufsz - pos,
                "Rx command responses:\t\t %u\n", isr_stats->rx);

        pos += scnprintf(buf + pos, bufsz - pos, "Tx/FH interrupt:\t\t %u\n",
                isr_stats->tx);

        pos += scnprintf(buf + pos, bufsz - pos, "Unexpected INTA:\t\t %u\n",
                isr_stats->unhandled);

        ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
        kfree(buf);
        return ret;
}

static ssize_t iwl_dbgfs_interrupt_write(struct file *file,
                                         const char __user *user_buf,
                                         size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct isr_statistics *isr_stats = &trans_pcie->isr_stats;

        char buf[8];
        int buf_size;
        u32 reset_flag;

        memset(buf, 0, sizeof(buf));
        buf_size = min(count, sizeof(buf) -  1);
        if (copy_from_user(buf, user_buf, buf_size))
                return -EFAULT;
        if (sscanf(buf, "%x", &reset_flag) != 1)
                return -EFAULT;
        if (reset_flag == 0)
                memset(isr_stats, 0, sizeof(*isr_stats));

        return count;
}

static ssize_t iwl_dbgfs_csr_write(struct file *file,
                                   const char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        char buf[8];
        int buf_size;
        int csr;

        memset(buf, 0, sizeof(buf));
        buf_size = min(count, sizeof(buf) -  1);
        if (copy_from_user(buf, user_buf, buf_size))
                return -EFAULT;
        if (sscanf(buf, "%d", &csr) != 1)
                return -EFAULT;

        iwl_pcie_dump_csr(trans);

        return count;
}

static ssize_t iwl_dbgfs_fh_reg_read(struct file *file,
                                     char __user *user_buf,
                                     size_t count, loff_t *ppos)
{
        struct iwl_trans *trans = file->private_data;
        char *buf = NULL;
        int pos = 0;
        ssize_t ret = -EFAULT;

        ret = pos = iwl_pcie_dump_fh(trans, &buf);
        if (buf) {
                ret = simple_read_from_buffer(user_buf,
                                              count, ppos, buf, pos);
                kfree(buf);
        }

        return ret;
}

DEBUGFS_READ_WRITE_FILE_OPS(interrupt);
DEBUGFS_READ_FILE_OPS(fh_reg);
DEBUGFS_READ_FILE_OPS(rx_queue);
DEBUGFS_READ_FILE_OPS(tx_queue);
DEBUGFS_WRITE_FILE_OPS(csr);

/*
 * Create the debugfs files and directories
 *
 */
static int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans,
                                         struct dentry *dir)
{
        DEBUGFS_ADD_FILE(rx_queue, dir, S_IRUSR);
        DEBUGFS_ADD_FILE(tx_queue, dir, S_IRUSR);
        DEBUGFS_ADD_FILE(interrupt, dir, S_IWUSR | S_IRUSR);
        DEBUGFS_ADD_FILE(csr, dir, S_IWUSR);
        DEBUGFS_ADD_FILE(fh_reg, dir, S_IRUSR);
        return 0;

err:
        IWL_ERR(trans, "failed to create the trans debugfs entry\n");
        return -ENOMEM;
}
#else
static int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans,
                                         struct dentry *dir)
{
        return 0;
}
#endif /*CONFIG_IWLWIFI_DEBUGFS */

static const struct iwl_trans_ops trans_ops_pcie = {
        .start_hw = iwl_trans_pcie_start_hw,
        .stop_hw = iwl_trans_pcie_stop_hw,
        .fw_alive = iwl_trans_pcie_fw_alive,
        .start_fw = iwl_trans_pcie_start_fw,
        .stop_device = iwl_trans_pcie_stop_device,

        .d3_suspend = iwl_trans_pcie_d3_suspend,
        .d3_resume = iwl_trans_pcie_d3_resume,

        .send_cmd = iwl_trans_pcie_send_hcmd,

        .tx = iwl_trans_pcie_tx,
        .reclaim = iwl_trans_pcie_reclaim,

        .txq_disable = iwl_trans_pcie_txq_disable,
        .txq_enable = iwl_trans_pcie_txq_enable,

        .dbgfs_register = iwl_trans_pcie_dbgfs_register,

        .wait_tx_queue_empty = iwl_trans_pcie_wait_txq_empty,

#ifdef CONFIG_PM_SLEEP
        .suspend = iwl_trans_pcie_suspend,
        .resume = iwl_trans_pcie_resume,
#endif
        .write8 = iwl_trans_pcie_write8,
        .write32 = iwl_trans_pcie_write32,
        .read32 = iwl_trans_pcie_read32,
        .read_prph = iwl_trans_pcie_read_prph,
        .write_prph = iwl_trans_pcie_write_prph,
        .read_mem = iwl_trans_pcie_read_mem,
        .write_mem = iwl_trans_pcie_write_mem,
        .configure = iwl_trans_pcie_configure,
        .set_pmi = iwl_trans_pcie_set_pmi,
        .grab_nic_access = iwl_trans_pcie_grab_nic_access,
        .release_nic_access = iwl_trans_pcie_release_nic_access,
        .set_bits_mask = iwl_trans_pcie_set_bits_mask,
};

struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
                                       const struct pci_device_id *ent,
                                       const struct iwl_cfg *cfg)
{
        struct iwl_trans_pcie *trans_pcie;
        struct iwl_trans *trans;
        u16 pci_cmd;
        int err;

        trans = kzalloc(sizeof(struct iwl_trans) +
                        sizeof(struct iwl_trans_pcie), GFP_KERNEL);

        if (!trans)
                return NULL;

        trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        trans->ops = &trans_ops_pcie;
        trans->cfg = cfg;
        trans_lockdep_init(trans);
        trans_pcie->trans = trans;
        spin_lock_init(&trans_pcie->irq_lock);
        spin_lock_init(&trans_pcie->reg_lock);
        init_waitqueue_head(&trans_pcie->ucode_write_waitq);

        /* 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_err(&pdev->dev, "No suitable DMA available\n");
                        goto out_pci_disable_device;
                }
        }

        err = pci_request_regions(pdev, DRV_NAME);
        if (err) {
                dev_err(&pdev->dev, "pci_request_regions failed\n");
                goto out_pci_disable_device;
        }

        trans_pcie->hw_base = pci_ioremap_bar(pdev, 0);
        if (!trans_pcie->hw_base) {
                dev_err(&pdev->dev, "pci_ioremap_bar failed\n");
                err = -ENODEV;
                goto out_pci_release_regions;
        }

        /* 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_err(&pdev->dev, "pci_enable_msi failed(0X%x)\n", err);
                /* 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);
                }
        }

        trans->dev = &pdev->dev;
        trans_pcie->pci_dev = pdev;
        trans->hw_rev = iwl_read32(trans, CSR_HW_REV);
        trans->hw_id = (pdev->device << 16) + pdev->subsystem_device;
        snprintf(trans->hw_id_str, sizeof(trans->hw_id_str),
                 "PCI ID: 0x%04X:0x%04X", pdev->device, pdev->subsystem_device);

        /* Initialize the wait queue for commands */
        init_waitqueue_head(&trans_pcie->wait_command_queue);

        snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
                 "iwl_cmd_pool:%s", dev_name(trans->dev));

        trans->dev_cmd_headroom = 0;
        trans->dev_cmd_pool =
                kmem_cache_create(trans->dev_cmd_pool_name,
                                  sizeof(struct iwl_device_cmd)
                                  + trans->dev_cmd_headroom,
                                  sizeof(void *),
                                  SLAB_HWCACHE_ALIGN,
                                  NULL);

        if (!trans->dev_cmd_pool)
                goto out_pci_disable_msi;

        trans_pcie->inta_mask = CSR_INI_SET_MASK;

        if (iwl_pcie_alloc_ict(trans))
                goto out_free_cmd_pool;

        if (request_threaded_irq(pdev->irq, iwl_pcie_isr_ict,
                                 iwl_pcie_irq_handler,
                                 IRQF_SHARED, DRV_NAME, trans)) {
                IWL_ERR(trans, "Error allocating IRQ %d\n", pdev->irq);
                goto out_free_ict;
        }

        return trans;

out_free_ict:
        iwl_pcie_free_ict(trans);
out_free_cmd_pool:
        kmem_cache_destroy(trans->dev_cmd_pool);
out_pci_disable_msi:
        pci_disable_msi(pdev);
out_pci_release_regions:
        pci_release_regions(pdev);
out_pci_disable_device:
        pci_disable_device(pdev);
out_no_pci:
        kfree(trans);
        return NULL;
}