/******************************************************************************
 *
 * 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 - 2015 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 * Copyright(c) 2018 - 2019 Intel Corporation
 *
 * 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.
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2015 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 * Copyright(c) 2018 - 2019 Intel Corporation
 * 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/interrupt.h>
#include <linux/debugfs.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/gfp.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/wait.h>

#include "iwl-drv.h"
#include "iwl-trans.h"
#include "iwl-csr.h"
#include "iwl-prph.h"
#include "iwl-scd.h"
#include "iwl-agn-hw.h"
#include "fw/error-dump.h"
#include "fw/dbg.h"
#include "fw/api/tx.h"
#include "internal.h"
#include "iwl-fh.h"

/* extended range in FW SRAM */
#define IWL_FW_MEM_EXTENDED_START       0x40000
#define IWL_FW_MEM_EXTENDED_END         0x57FFF

void iwl_trans_pcie_dump_regs(struct iwl_trans *trans)
{
#define PCI_DUMP_SIZE           352
#define PCI_MEM_DUMP_SIZE       64
#define PCI_PARENT_DUMP_SIZE    524
#define PREFIX_LEN              32
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct pci_dev *pdev = trans_pcie->pci_dev;
        u32 i, pos, alloc_size, *ptr, *buf;
        char *prefix;

        if (trans_pcie->pcie_dbg_dumped_once)
                return;

        /* Should be a multiple of 4 */
        BUILD_BUG_ON(PCI_DUMP_SIZE > 4096 || PCI_DUMP_SIZE & 0x3);
        BUILD_BUG_ON(PCI_MEM_DUMP_SIZE > 4096 || PCI_MEM_DUMP_SIZE & 0x3);
        BUILD_BUG_ON(PCI_PARENT_DUMP_SIZE > 4096 || PCI_PARENT_DUMP_SIZE & 0x3);

        /* Alloc a max size buffer */
        alloc_size = PCI_ERR_ROOT_ERR_SRC +  4 + PREFIX_LEN;
        alloc_size = max_t(u32, alloc_size, PCI_DUMP_SIZE + PREFIX_LEN);
        alloc_size = max_t(u32, alloc_size, PCI_MEM_DUMP_SIZE + PREFIX_LEN);
        alloc_size = max_t(u32, alloc_size, PCI_PARENT_DUMP_SIZE + PREFIX_LEN);

        buf = kmalloc(alloc_size, GFP_ATOMIC);
        if (!buf)
                return;
        prefix = (char *)buf + alloc_size - PREFIX_LEN;

        IWL_ERR(trans, "iwlwifi transaction failed, dumping registers\n");

        /* Print wifi device registers */
        sprintf(prefix, "iwlwifi %s: ", pci_name(pdev));
        IWL_ERR(trans, "iwlwifi device config registers:\n");
        for (i = 0, ptr = buf; i < PCI_DUMP_SIZE; i += 4, ptr++)
                if (pci_read_config_dword(pdev, i, ptr))
                        goto err_read;
        print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, 32, 4, buf, i, 0);

        IWL_ERR(trans, "iwlwifi device memory mapped registers:\n");
        for (i = 0, ptr = buf; i < PCI_MEM_DUMP_SIZE; i += 4, ptr++)
                *ptr = iwl_read32(trans, i);
        print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, 32, 4, buf, i, 0);

        pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
        if (pos) {
                IWL_ERR(trans, "iwlwifi device AER capability structure:\n");
                for (i = 0, ptr = buf; i < PCI_ERR_ROOT_COMMAND; i += 4, ptr++)
                        if (pci_read_config_dword(pdev, pos + i, ptr))
                                goto err_read;
                print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET,
                               32, 4, buf, i, 0);
        }

        /* Print parent device registers next */
        if (!pdev->bus->self)
                goto out;

        pdev = pdev->bus->self;
        sprintf(prefix, "iwlwifi %s: ", pci_name(pdev));

        IWL_ERR(trans, "iwlwifi parent port (%s) config registers:\n",
                pci_name(pdev));
        for (i = 0, ptr = buf; i < PCI_PARENT_DUMP_SIZE; i += 4, ptr++)
                if (pci_read_config_dword(pdev, i, ptr))
                        goto err_read;
        print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, 32, 4, buf, i, 0);

        /* Print root port AER registers */
        pos = 0;
        pdev = pcie_find_root_port(pdev);
        if (pdev)
                pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
        if (pos) {
                IWL_ERR(trans, "iwlwifi root port (%s) AER cap structure:\n",
                        pci_name(pdev));
                sprintf(prefix, "iwlwifi %s: ", pci_name(pdev));
                for (i = 0, ptr = buf; i <= PCI_ERR_ROOT_ERR_SRC; i += 4, ptr++)
                        if (pci_read_config_dword(pdev, pos + i, ptr))
                                goto err_read;
                print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, 32,
                               4, buf, i, 0);
        }
        goto out;

err_read:
        print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, 32, 4, buf, i, 0);
        IWL_ERR(trans, "Read failed at 0x%X\n", i);
out:
        trans_pcie->pcie_dbg_dumped_once = 1;
        kfree(buf);
}

static void iwl_trans_pcie_sw_reset(struct iwl_trans *trans)
{
        /* Reset entire device - do controller reset (results in SHRD_HW_RST) */
        iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
        usleep_range(5000, 6000);
}

static void iwl_pcie_free_fw_monitor(struct iwl_trans *trans)
{
        struct iwl_dram_data *fw_mon = &trans->dbg.fw_mon;

        if (!fw_mon->size)
                return;

        dma_free_coherent(trans->dev, fw_mon->size, fw_mon->block,
                          fw_mon->physical);

        fw_mon->block = NULL;
        fw_mon->physical = 0;
        fw_mon->size = 0;
}

static void iwl_pcie_alloc_fw_monitor_block(struct iwl_trans *trans,
                                            u8 max_power, u8 min_power)
{
        struct iwl_dram_data *fw_mon = &trans->dbg.fw_mon;
        void *block = NULL;
        dma_addr_t physical = 0;
        u32 size = 0;
        u8 power;

        if (fw_mon->size)
                return;

        for (power = max_power; power >= min_power; power--) {
                size = BIT(power);
                block = dma_alloc_coherent(trans->dev, size, &physical,
                                           GFP_KERNEL | __GFP_NOWARN);
                if (!block)
                        continue;

                IWL_INFO(trans,
                         "Allocated 0x%08x bytes for firmware monitor.\n",
                         size);
                break;
        }

        if (WARN_ON_ONCE(!block))
                return;

        if (power != max_power)
                IWL_ERR(trans,
                        "Sorry - debug buffer is only %luK while you requested %luK\n",
                        (unsigned long)BIT(power - 10),
                        (unsigned long)BIT(max_power - 10));

        fw_mon->block = block;
        fw_mon->physical = physical;
        fw_mon->size = size;
}

void iwl_pcie_alloc_fw_monitor(struct iwl_trans *trans, u8 max_power)
{
        if (!max_power) {
                /* default max_power is maximum */
                max_power = 26;
        } else {
                max_power += 11;
        }

        if (WARN(max_power > 26,
                 "External buffer size for monitor is too big %d, check the FW TLV\n",
                 max_power))
                return;

        if (trans->dbg.fw_mon.size)
                return;

        iwl_pcie_alloc_fw_monitor_block(trans, max_power, 11);
}

static u32 iwl_trans_pcie_read_shr(struct iwl_trans *trans, u32 reg)
{
        iwl_write32(trans, HEEP_CTRL_WRD_PCIEX_CTRL_REG,
                    ((reg & 0x0000ffff) | (2 << 28)));
        return iwl_read32(trans, HEEP_CTRL_WRD_PCIEX_DATA_REG);
}

static void iwl_trans_pcie_write_shr(struct iwl_trans *trans, u32 reg, u32 val)
{
        iwl_write32(trans, HEEP_CTRL_WRD_PCIEX_DATA_REG, val);
        iwl_write32(trans, HEEP_CTRL_WRD_PCIEX_CTRL_REG,
                    ((reg & 0x0000ffff) | (3 << 28)));
}

static void iwl_pcie_set_pwr(struct iwl_trans *trans, bool vaux)
{
        if (trans->cfg->apmg_not_supported)
                return;

        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

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

        /*
         * L0S states have been found to be unstable with our devices
         * and in newer hardware they are not officially supported at
         * all, so we must always set the L0S_DISABLED bit.
         */
        iwl_set_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_DISABLED);

        pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_LNKCTL, &lctl);
        trans->pm_support = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);

        pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_DEVCTL2, &cap);
        trans->ltr_enabled = cap & PCI_EXP_DEVCTL2_LTR_EN;
        IWL_DEBUG_POWER(trans, "L1 %sabled - LTR %sabled\n",
                        (lctl & PCI_EXP_LNKCTL_ASPM_L1) ? "En" : "Dis",
                        trans->ltr_enabled ? "En" : "Dis");
}

/*
 * 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)
{
        int ret;

        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) */
        if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_8000)
                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->trans_cfg->base_params->pll_cfg)
                iwl_set_bit(trans, CSR_ANA_PLL_CFG, CSR50_ANA_PLL_CFG_VAL);

        ret = iwl_finish_nic_init(trans, trans->trans_cfg);
        if (ret)
                return ret;

        if (trans->cfg->host_interrupt_operation_mode) {
                /*
                 * This is a bit of an abuse - This is needed for 7260 / 3160
                 * only check host_interrupt_operation_mode even if this is
                 * not related to host_interrupt_operation_mode.
                 *
                 * Enable the oscillator to count wake up time for L1 exit. This
                 * consumes slightly more power (100uA) - but allows to be sure
                 * that we wake up from L1 on time.
                 *
                 * This looks weird: read twice the same register, discard the
                 * value, set a bit, and yet again, read that same register
                 * just to discard the value. But that's the way the hardware
                 * seems to like it.
                 */
                iwl_read_prph(trans, OSC_CLK);
                iwl_read_prph(trans, OSC_CLK);
                iwl_set_bits_prph(trans, OSC_CLK, OSC_CLK_FORCE_CONTROL);
                iwl_read_prph(trans, OSC_CLK);
                iwl_read_prph(trans, OSC_CLK);
        }

        /*
         * 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.
         */
        if (!trans->cfg->apmg_not_supported) {
                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);

                /* Clear the interrupt in APMG if the NIC is in RFKILL */
                iwl_write_prph(trans, APMG_RTC_INT_STT_REG,
                               APMG_RTC_INT_STT_RFKILL);
        }

        set_bit(STATUS_DEVICE_ENABLED, &trans->status);

        return 0;
}

/*
 * Enable LP XTAL to avoid HW bug where device may consume much power if
 * FW is not loaded after device reset. LP XTAL is disabled by default
 * after device HW reset. Do it only if XTAL is fed by internal source.
 * Configure device's "persistence" mode to avoid resetting XTAL again when
 * SHRD_HW_RST occurs in S3.
 */
static void iwl_pcie_apm_lp_xtal_enable(struct iwl_trans *trans)
{
        int ret;
        u32 apmg_gp1_reg;
        u32 apmg_xtal_cfg_reg;
        u32 dl_cfg_reg;

        /* Force XTAL ON */
        __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
                                 CSR_GP_CNTRL_REG_FLAG_XTAL_ON);

        iwl_trans_pcie_sw_reset(trans);

        ret = iwl_finish_nic_init(trans, trans->trans_cfg);
        if (WARN_ON(ret)) {
                /* Release XTAL ON request */
                __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
                                           CSR_GP_CNTRL_REG_FLAG_XTAL_ON);
                return;
        }

        /*
         * Clear "disable persistence" to avoid LP XTAL resetting when
         * SHRD_HW_RST is applied in S3.
         */
        iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG,
                                    APMG_PCIDEV_STT_VAL_PERSIST_DIS);

        /*
         * Force APMG XTAL to be active to prevent its disabling by HW
         * caused by APMG idle state.
         */
        apmg_xtal_cfg_reg = iwl_trans_pcie_read_shr(trans,
                                                    SHR_APMG_XTAL_CFG_REG);
        iwl_trans_pcie_write_shr(trans, SHR_APMG_XTAL_CFG_REG,
                                 apmg_xtal_cfg_reg |
                                 SHR_APMG_XTAL_CFG_XTAL_ON_REQ);

        iwl_trans_pcie_sw_reset(trans);

        /* Enable LP XTAL by indirect access through CSR */
        apmg_gp1_reg = iwl_trans_pcie_read_shr(trans, SHR_APMG_GP1_REG);
        iwl_trans_pcie_write_shr(trans, SHR_APMG_GP1_REG, apmg_gp1_reg |
                                 SHR_APMG_GP1_WF_XTAL_LP_EN |
                                 SHR_APMG_GP1_CHICKEN_BIT_SELECT);

        /* Clear delay line clock power up */
        dl_cfg_reg = iwl_trans_pcie_read_shr(trans, SHR_APMG_DL_CFG_REG);
        iwl_trans_pcie_write_shr(trans, SHR_APMG_DL_CFG_REG, dl_cfg_reg &
                                 ~SHR_APMG_DL_CFG_DL_CLOCK_POWER_UP);

        /*
         * Enable persistence mode to avoid LP XTAL resetting when
         * SHRD_HW_RST is applied in S3.
         */
        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                    CSR_HW_IF_CONFIG_REG_PERSIST_MODE);

        /*
         * 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);

        /* Activates XTAL resources monitor */
        __iwl_trans_pcie_set_bit(trans, CSR_MONITOR_CFG_REG,
                                 CSR_MONITOR_XTAL_RESOURCES);

        /* Release XTAL ON request */
        __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
                                   CSR_GP_CNTRL_REG_FLAG_XTAL_ON);
        udelay(10);

        /* Release APMG XTAL */
        iwl_trans_pcie_write_shr(trans, SHR_APMG_XTAL_CFG_REG,
                                 apmg_xtal_cfg_reg &
                                 ~SHR_APMG_XTAL_CFG_XTAL_ON_REQ);
}

void iwl_pcie_apm_stop_master(struct iwl_trans *trans)
{
        int ret;

        /* 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 < 0)
                IWL_WARN(trans, "Master Disable Timed Out, 100 usec\n");

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

static void iwl_pcie_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
{
        IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n");

        if (op_mode_leave) {
                if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status))
                        iwl_pcie_apm_init(trans);

                /* inform ME that we are leaving */
                if (trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_7000)
                        iwl_set_bits_prph(trans, APMG_PCIDEV_STT_REG,
                                          APMG_PCIDEV_STT_VAL_WAKE_ME);
                else if (trans->trans_cfg->device_family >=
                         IWL_DEVICE_FAMILY_8000) {
                        iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
                                    CSR_RESET_LINK_PWR_MGMT_DISABLED);
                        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                                    CSR_HW_IF_CONFIG_REG_PREPARE |
                                    CSR_HW_IF_CONFIG_REG_ENABLE_PME);
                        mdelay(1);
                        iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
                                      CSR_RESET_LINK_PWR_MGMT_DISABLED);
                }
                mdelay(5);
        }

        clear_bit(STATUS_DEVICE_ENABLED, &trans->status);

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

        if (trans->cfg->lp_xtal_workaround) {
                iwl_pcie_apm_lp_xtal_enable(trans);
                return;
        }

        iwl_trans_pcie_sw_reset(trans);

        /*
         * 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);
        int ret;

        /* nic_init */
        spin_lock(&trans_pcie->irq_lock);
        ret = iwl_pcie_apm_init(trans);
        spin_unlock(&trans_pcie->irq_lock);

        if (ret)
                return ret;

        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->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);

        if (ret >= 0)
                iwl_set_bit(trans, CSR_MBOX_SET_REG, CSR_MBOX_SET_REG_OS_ALIVE);

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

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

        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;

        iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
                    CSR_RESET_LINK_PWR_MGMT_DISABLED);
        usleep_range(1000, 2000);

        for (iter = 0; iter < 10; iter++) {
                /* 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);
                msleep(25);
        }

        IWL_ERR(trans, "Couldn't prepare the card\n");

        return ret;
}

/*
 * ucode
 */
static void iwl_pcie_load_firmware_chunk_fh(struct iwl_trans *trans,
                                            u32 dst_addr, dma_addr_t phy_addr,
                                            u32 byte_cnt)
{
        iwl_write32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(FH_SRVC_CHNL),
                    FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_PAUSE);

        iwl_write32(trans, FH_SRVC_CHNL_SRAM_ADDR_REG(FH_SRVC_CHNL),
                    dst_addr);

        iwl_write32(trans, FH_TFDIB_CTRL0_REG(FH_SRVC_CHNL),
                    phy_addr & FH_MEM_TFDIB_DRAM_ADDR_LSB_MSK);

        iwl_write32(trans, FH_TFDIB_CTRL1_REG(FH_SRVC_CHNL),
                    (iwl_get_dma_hi_addr(phy_addr)
                        << FH_MEM_TFDIB_REG1_ADDR_BITSHIFT) | byte_cnt);

        iwl_write32(trans, FH_TCSR_CHNL_TX_BUF_STS_REG(FH_SRVC_CHNL),
                    BIT(FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_NUM) |
                    BIT(FH_TCSR_CHNL_TX_BUF_STS_REG_POS_TB_IDX) |
                    FH_TCSR_CHNL_TX_BUF_STS_REG_VAL_TFDB_VALID);

        iwl_write32(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);
}

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);
        unsigned long flags;
        int ret;

        trans_pcie->ucode_write_complete = false;

        if (!iwl_trans_grab_nic_access(trans, &flags))
                return -EIO;

        iwl_pcie_load_firmware_chunk_fh(trans, dst_addr, phy_addr,
                                        byte_cnt);
        iwl_trans_release_nic_access(trans, &flags);

        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");
                iwl_trans_pcie_dump_regs(trans);
                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, chunk_sz = min_t(u32, FH_MEM_TB_MAX_LENGTH, section->len);
        int ret = 0;

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

        v_addr = dma_alloc_coherent(trans->dev, chunk_sz, &p_addr,
                                    GFP_KERNEL | __GFP_NOWARN);
        if (!v_addr) {
                IWL_DEBUG_INFO(trans, "Falling back to small chunks of DMA\n");
                chunk_sz = PAGE_SIZE;
                v_addr = dma_alloc_coherent(trans->dev, chunk_sz,
                                            &p_addr, GFP_KERNEL);
                if (!v_addr)
                        return -ENOMEM;
        }

        for (offset = 0; offset < section->len; offset += chunk_sz) {
                u32 copy_size, dst_addr;
                bool extended_addr = false;

                copy_size = min_t(u32, chunk_sz, section->len - offset);
                dst_addr = section->offset + offset;

                if (dst_addr >= IWL_FW_MEM_EXTENDED_START &&
                    dst_addr <= IWL_FW_MEM_EXTENDED_END)
                        extended_addr = true;

                if (extended_addr)
                        iwl_set_bits_prph(trans, LMPM_CHICK,
                                          LMPM_CHICK_EXTENDED_ADDR_SPACE);

                memcpy(v_addr, (u8 *)section->data + offset, copy_size);
                ret = iwl_pcie_load_firmware_chunk(trans, dst_addr, p_addr,
                                                   copy_size);

                if (extended_addr)
                        iwl_clear_bits_prph(trans, LMPM_CHICK,
                                            LMPM_CHICK_EXTENDED_ADDR_SPACE);

                if (ret) {
                        IWL_ERR(trans,
                                "Could not load the [%d] uCode section\n",
                                section_num);
                        break;
                }
        }

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

static int iwl_pcie_load_cpu_sections_8000(struct iwl_trans *trans,
                                           const struct fw_img *image,
                                           int cpu,
                                           int *first_ucode_section)
{
        int shift_param;
        int i, ret = 0, sec_num = 0x1;
        u32 val, last_read_idx = 0;

        if (cpu == 1) {
                shift_param = 0;
                *first_ucode_section = 0;
        } else {
                shift_param = 16;
                (*first_ucode_section)++;
        }

        for (i = *first_ucode_section; i < image->num_sec; i++) {
                last_read_idx = i;

                /*
                 * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between
                 * CPU1 to CPU2.
                 * PAGING_SEPARATOR_SECTION delimiter - separate between
                 * CPU2 non paged to CPU2 paging sec.
                 */
                if (!image->sec[i].data ||
                    image->sec[i].offset == CPU1_CPU2_SEPARATOR_SECTION ||
                    image->sec[i].offset == PAGING_SEPARATOR_SECTION) {
                        IWL_DEBUG_FW(trans,
                                     "Break since Data not valid or Empty section, sec = %d\n",
                                     i);
                        break;
                }

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

                /* Notify ucode of loaded section number and status */
                val = iwl_read_direct32(trans, FH_UCODE_LOAD_STATUS);
                val = val | (sec_num << shift_param);
                iwl_write_direct32(trans, FH_UCODE_LOAD_STATUS, val);

                sec_num = (sec_num << 1) | 0x1;
        }

        *first_ucode_section = last_read_idx;

        iwl_enable_interrupts(trans);

        if (trans->trans_cfg->use_tfh) {
                if (cpu == 1)
                        iwl_write_prph(trans, UREG_UCODE_LOAD_STATUS,
                                       0xFFFF);
                else
                        iwl_write_prph(trans, UREG_UCODE_LOAD_STATUS,
                                       0xFFFFFFFF);
        } else {
                if (cpu == 1)
                        iwl_write_direct32(trans, FH_UCODE_LOAD_STATUS,
                                           0xFFFF);
                else
                        iwl_write_direct32(trans, FH_UCODE_LOAD_STATUS,
                                           0xFFFFFFFF);
        }

        return 0;
}

static int iwl_pcie_load_cpu_sections(struct iwl_trans *trans,
                                      const struct fw_img *image,
                                      int cpu,
                                      int *first_ucode_section)
{
        int i, ret = 0;
        u32 last_read_idx = 0;

        if (cpu == 1)
                *first_ucode_section = 0;
        else
                (*first_ucode_section)++;

        for (i = *first_ucode_section; i < image->num_sec; i++) {
                last_read_idx = i;

                /*
                 * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between
                 * CPU1 to CPU2.
                 * PAGING_SEPARATOR_SECTION delimiter - separate between
                 * CPU2 non paged to CPU2 paging sec.
                 */
                if (!image->sec[i].data ||
                    image->sec[i].offset == CPU1_CPU2_SEPARATOR_SECTION ||
                    image->sec[i].offset == PAGING_SEPARATOR_SECTION) {
                        IWL_DEBUG_FW(trans,
                                     "Break since Data not valid or Empty section, sec = %d\n",
                                     i);
                        break;
                }

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

        *first_ucode_section = last_read_idx;

        return 0;
}

static void iwl_pcie_apply_destination_ini(struct iwl_trans *trans)
{
        enum iwl_fw_ini_allocation_id alloc_id = IWL_FW_INI_ALLOCATION_ID_DBGC1;
        struct iwl_fw_ini_allocation_tlv *fw_mon_cfg =
                &trans->dbg.fw_mon_cfg[alloc_id];
        struct iwl_dram_data *frag;

        if (!iwl_trans_dbg_ini_valid(trans))
                return;

        if (le32_to_cpu(fw_mon_cfg->buf_location) ==
            IWL_FW_INI_LOCATION_SRAM_PATH) {
                IWL_DEBUG_FW(trans, "WRT: Applying SMEM buffer destination\n");
                /* set sram monitor by enabling bit 7 */
                iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                            CSR_HW_IF_CONFIG_REG_BIT_MONITOR_SRAM);

                return;
        }

        if (le32_to_cpu(fw_mon_cfg->buf_location) !=
            IWL_FW_INI_LOCATION_DRAM_PATH ||
            !trans->dbg.fw_mon_ini[alloc_id].num_frags)
                return;

        frag = &trans->dbg.fw_mon_ini[alloc_id].frags[0];

        IWL_DEBUG_FW(trans, "WRT: Applying DRAM destination (alloc_id=%u)\n",
                     alloc_id);

        iwl_write_umac_prph(trans, MON_BUFF_BASE_ADDR_VER2,
                            frag->physical >> MON_BUFF_SHIFT_VER2);
        iwl_write_umac_prph(trans, MON_BUFF_END_ADDR_VER2,
                            (frag->physical + frag->size - 256) >>
                            MON_BUFF_SHIFT_VER2);
}

void iwl_pcie_apply_destination(struct iwl_trans *trans)
{
        const struct iwl_fw_dbg_dest_tlv_v1 *dest = trans->dbg.dest_tlv;
        const struct iwl_dram_data *fw_mon = &trans->dbg.fw_mon;
        int i;

        if (iwl_trans_dbg_ini_valid(trans)) {
                iwl_pcie_apply_destination_ini(trans);
                return;
        }

        IWL_INFO(trans, "Applying debug destination %s\n",
                 get_fw_dbg_mode_string(dest->monitor_mode));

        if (dest->monitor_mode == EXTERNAL_MODE)
                iwl_pcie_alloc_fw_monitor(trans, dest->size_power);
        else
                IWL_WARN(trans, "PCI should have external buffer debug\n");

        for (i = 0; i < trans->dbg.n_dest_reg; i++) {
                u32 addr = le32_to_cpu(dest->reg_ops[i].addr);
                u32 val = le32_to_cpu(dest->reg_ops[i].val);

                switch (dest->reg_ops[i].op) {
                case CSR_ASSIGN:
                        iwl_write32(trans, addr, val);
                        break;
                case CSR_SETBIT:
                        iwl_set_bit(trans, addr, BIT(val));
                        break;
                case CSR_CLEARBIT:
                        iwl_clear_bit(trans, addr, BIT(val));
                        break;
                case PRPH_ASSIGN:
                        iwl_write_prph(trans, addr, val);
                        break;
                case PRPH_SETBIT:
                        iwl_set_bits_prph(trans, addr, BIT(val));
                        break;
                case PRPH_CLEARBIT:
                        iwl_clear_bits_prph(trans, addr, BIT(val));
                        break;
                case PRPH_BLOCKBIT:
                        if (iwl_read_prph(trans, addr) & BIT(val)) {
                                IWL_ERR(trans,
                                        "BIT(%u) in address 0x%x is 1, stopping FW configuration\n",
                                        val, addr);
                                goto monitor;
                        }
                        break;
                default:
                        IWL_ERR(trans, "FW debug - unknown OP %d\n",
                                dest->reg_ops[i].op);
                        break;
                }
        }

monitor:
        if (dest->monitor_mode == EXTERNAL_MODE && fw_mon->size) {
                iwl_write_prph(trans, le32_to_cpu(dest->base_reg),
                               fw_mon->physical >> dest->base_shift);
                if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_8000)
                        iwl_write_prph(trans, le32_to_cpu(dest->end_reg),
                                       (fw_mon->physical + fw_mon->size -
                                        256) >> dest->end_shift);
                else
                        iwl_write_prph(trans, le32_to_cpu(dest->end_reg),
                                       (fw_mon->physical + fw_mon->size) >>
                                       dest->end_shift);
        }
}

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

        IWL_DEBUG_FW(trans, "working with %s CPU\n",

                     image->is_dual_cpus ? "Dual" : "Single");

        /* load to FW the binary non secured sections of CPU1 */
        ret = iwl_pcie_load_cpu_sections(trans, image, 1, &first_ucode_section);
        if (ret)
                return ret;

        if (image->is_dual_cpus) {
                /* set CPU2 header address */
                iwl_write_prph(trans,
                               LMPM_SECURE_UCODE_LOAD_CPU2_HDR_ADDR,
                               LMPM_SECURE_CPU2_HDR_MEM_SPACE);

                /* load to FW the binary sections of CPU2 */
                ret = iwl_pcie_load_cpu_sections(trans, image, 2,
                                                 &first_ucode_section);
                if (ret)
                        return ret;
        }

        /* supported for 7000 only for the moment */
        if (iwlwifi_mod_params.fw_monitor &&
            trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_7000) {
                struct iwl_dram_data *fw_mon = &trans->dbg.fw_mon;

                iwl_pcie_alloc_fw_monitor(trans, 0);
                if (fw_mon->size) {
                        iwl_write_prph(trans, MON_BUFF_BASE_ADDR,
                                       fw_mon->physical >> 4);
                        iwl_write_prph(trans, MON_BUFF_END_ADDR,
                                       (fw_mon->physical + fw_mon->size) >> 4);
                }
        } else if (iwl_pcie_dbg_on(trans)) {
                iwl_pcie_apply_destination(trans);
        }

        iwl_enable_interrupts(trans);

        /* release CPU reset */
        iwl_write32(trans, CSR_RESET, 0);

        return 0;
}

static int iwl_pcie_load_given_ucode_8000(struct iwl_trans *trans,
                                          const struct fw_img *image)
{
        int ret = 0;
        int first_ucode_section;

        IWL_DEBUG_FW(trans, "working with %s CPU\n",
                     image->is_dual_cpus ? "Dual" : "Single");

        if (iwl_pcie_dbg_on(trans))
                iwl_pcie_apply_destination(trans);

        IWL_DEBUG_POWER(trans, "Original WFPM value = 0x%08X\n",
                        iwl_read_prph(trans, WFPM_GP2));

        /*
         * Set default value. On resume reading the values that were
         * zeored can provide debug data on the resume flow.
         * This is for debugging only and has no functional impact.
         */
        iwl_write_prph(trans, WFPM_GP2, 0x01010101);

        /* configure the ucode to be ready to get the secured image */
        /* release CPU reset */
        iwl_write_prph(trans, RELEASE_CPU_RESET, RELEASE_CPU_RESET_BIT);

        /* load to FW the binary Secured sections of CPU1 */
        ret = iwl_pcie_load_cpu_sections_8000(trans, image, 1,
                                              &first_ucode_section);
        if (ret)
                return ret;

        /* load to FW the binary sections of CPU2 */
        return iwl_pcie_load_cpu_sections_8000(trans, image, 2,
                                               &first_ucode_section);
}

bool iwl_pcie_check_hw_rf_kill(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie =  IWL_TRANS_GET_PCIE_TRANS(trans);
        bool hw_rfkill = iwl_is_rfkill_set(trans);
        bool prev = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
        bool report;

        if (hw_rfkill) {
                set_bit(STATUS_RFKILL_HW, &trans->status);
                set_bit(STATUS_RFKILL_OPMODE, &trans->status);
        } else {
                clear_bit(STATUS_RFKILL_HW, &trans->status);
                if (trans_pcie->opmode_down)
                        clear_bit(STATUS_RFKILL_OPMODE, &trans->status);
        }

        report = test_bit(STATUS_RFKILL_OPMODE, &trans->status);

        if (prev != report)
                iwl_trans_pcie_rf_kill(trans, report);

        return hw_rfkill;
}

struct iwl_causes_list {
        u32 cause_num;
        u32 mask_reg;
        u8 addr;
};

static struct iwl_causes_list causes_list[] = {
        {MSIX_FH_INT_CAUSES_D2S_CH0_NUM,        CSR_MSIX_FH_INT_MASK_AD, 0},
        {MSIX_FH_INT_CAUSES_D2S_CH1_NUM,        CSR_MSIX_FH_INT_MASK_AD, 0x1},
        {MSIX_FH_INT_CAUSES_S2D,                CSR_MSIX_FH_INT_MASK_AD, 0x3},
        {MSIX_FH_INT_CAUSES_FH_ERR,             CSR_MSIX_FH_INT_MASK_AD, 0x5},
        {MSIX_HW_INT_CAUSES_REG_ALIVE,          CSR_MSIX_HW_INT_MASK_AD, 0x10},
        {MSIX_HW_INT_CAUSES_REG_WAKEUP,         CSR_MSIX_HW_INT_MASK_AD, 0x11},
        {MSIX_HW_INT_CAUSES_REG_IML,            CSR_MSIX_HW_INT_MASK_AD, 0x12},
        {MSIX_HW_INT_CAUSES_REG_CT_KILL,        CSR_MSIX_HW_INT_MASK_AD, 0x16},
        {MSIX_HW_INT_CAUSES_REG_RF_KILL,        CSR_MSIX_HW_INT_MASK_AD, 0x17},
        {MSIX_HW_INT_CAUSES_REG_PERIODIC,       CSR_MSIX_HW_INT_MASK_AD, 0x18},
        {MSIX_HW_INT_CAUSES_REG_SW_ERR,         CSR_MSIX_HW_INT_MASK_AD, 0x29},
        {MSIX_HW_INT_CAUSES_REG_SCD,            CSR_MSIX_HW_INT_MASK_AD, 0x2A},
        {MSIX_HW_INT_CAUSES_REG_FH_TX,          CSR_MSIX_HW_INT_MASK_AD, 0x2B},
        {MSIX_HW_INT_CAUSES_REG_HW_ERR,         CSR_MSIX_HW_INT_MASK_AD, 0x2D},
        {MSIX_HW_INT_CAUSES_REG_HAP,            CSR_MSIX_HW_INT_MASK_AD, 0x2E},
};

static void iwl_pcie_map_non_rx_causes(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie =  IWL_TRANS_GET_PCIE_TRANS(trans);
        int val = trans_pcie->def_irq | MSIX_NON_AUTO_CLEAR_CAUSE;
        int i, arr_size = ARRAY_SIZE(causes_list);
        struct iwl_causes_list *causes = causes_list;

        /*
         * Access all non RX causes and map them to the default irq.
         * In case we are missing at least one interrupt vector,
         * the first interrupt vector will serve non-RX and FBQ causes.
         */
        for (i = 0; i < arr_size; i++) {
                iwl_write8(trans, CSR_MSIX_IVAR(causes[i].addr), val);
                iwl_clear_bit(trans, causes[i].mask_reg,
                              causes[i].cause_num);
        }
}

static void iwl_pcie_map_rx_causes(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 offset =
                trans_pcie->shared_vec_mask & IWL_SHARED_IRQ_FIRST_RSS ? 1 : 0;
        u32 val, idx;

        /*
         * The first RX queue - fallback queue, which is designated for
         * management frame, command responses etc, is always mapped to the
         * first interrupt vector. The other RX queues are mapped to
         * the other (N - 2) interrupt vectors.
         */
        val = BIT(MSIX_FH_INT_CAUSES_Q(0));
        for (idx = 1; idx < trans->num_rx_queues; idx++) {
                iwl_write8(trans, CSR_MSIX_RX_IVAR(idx),
                           MSIX_FH_INT_CAUSES_Q(idx - offset));
                val |= BIT(MSIX_FH_INT_CAUSES_Q(idx));
        }
        iwl_write32(trans, CSR_MSIX_FH_INT_MASK_AD, ~val);

        val = MSIX_FH_INT_CAUSES_Q(0);
        if (trans_pcie->shared_vec_mask & IWL_SHARED_IRQ_NON_RX)
                val |= MSIX_NON_AUTO_CLEAR_CAUSE;
        iwl_write8(trans, CSR_MSIX_RX_IVAR(0), val);

        if (trans_pcie->shared_vec_mask & IWL_SHARED_IRQ_FIRST_RSS)
                iwl_write8(trans, CSR_MSIX_RX_IVAR(1), val);
}

void iwl_pcie_conf_msix_hw(struct iwl_trans_pcie *trans_pcie)
{
        struct iwl_trans *trans = trans_pcie->trans;

        if (!trans_pcie->msix_enabled) {
                if (trans->trans_cfg->mq_rx_supported &&
                    test_bit(STATUS_DEVICE_ENABLED, &trans->status))
                        iwl_write_umac_prph(trans, UREG_CHICK,
                                            UREG_CHICK_MSI_ENABLE);
                return;
        }
        /*
         * The IVAR table needs to be configured again after reset,
         * but if the device is disabled, we can't write to
         * prph.
         */
        if (test_bit(STATUS_DEVICE_ENABLED, &trans->status))
                iwl_write_umac_prph(trans, UREG_CHICK, UREG_CHICK_MSIX_ENABLE);

        /*
         * Each cause from the causes list above and the RX causes is
         * represented as a byte in the IVAR table. The first nibble
         * represents the bound interrupt vector of the cause, the second
         * represents no auto clear for this cause. This will be set if its
         * interrupt vector is bound to serve other causes.
         */
        iwl_pcie_map_rx_causes(trans);

        iwl_pcie_map_non_rx_causes(trans);
}

static void iwl_pcie_init_msix(struct iwl_trans_pcie *trans_pcie)
{
        struct iwl_trans *trans = trans_pcie->trans;

        iwl_pcie_conf_msix_hw(trans_pcie);

        if (!trans_pcie->msix_enabled)
                return;

        trans_pcie->fh_init_mask = ~iwl_read32(trans, CSR_MSIX_FH_INT_MASK_AD);
        trans_pcie->fh_mask = trans_pcie->fh_init_mask;
        trans_pcie->hw_init_mask = ~iwl_read32(trans, CSR_MSIX_HW_INT_MASK_AD);
        trans_pcie->hw_mask = trans_pcie->hw_init_mask;
}

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

        lockdep_assert_held(&trans_pcie->mutex);

        if (trans_pcie->is_down)
                return;

        trans_pcie->is_down = true;

        /* tell the device to stop sending interrupts */
        iwl_disable_interrupts(trans);

        /* 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_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
                IWL_DEBUG_INFO(trans,
                               "DEVICE_ENABLED bit was set and is now cleared\n");
                iwl_pcie_tx_stop(trans);
                iwl_pcie_rx_stop(trans);

                /* Power-down device's busmaster DMA clocks */
                if (!trans->cfg->apmg_not_supported) {
                        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, false);

        iwl_trans_pcie_sw_reset(trans);

        /*
         * Upon stop, the IVAR table gets erased, so msi-x won't
         * work. This causes a bug in RF-KILL flows, since the interrupt
         * that enables radio won't fire on the correct irq, and the
         * driver won't be able to handle the interrupt.
         * Configure the IVAR table again after reset.
         */
        iwl_pcie_conf_msix_hw(trans_pcie);

        /*
         * Upon stop, the APM issues an interrupt if HW RF kill is set.
         * This is a bug in certain verions of the hardware.
         * Certain devices also keep sending HW RF kill interrupt all
         * the time, unless the interrupt is ACKed even if the interrupt
         * should be masked. Re-ACK all the interrupts here.
         */
        iwl_disable_interrupts(trans);

        /* clear all status bits */
        clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
        clear_bit(STATUS_INT_ENABLED, &trans->status);
        clear_bit(STATUS_TPOWER_PMI, &trans->status);

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

        /* re-take ownership to prevent other users from stealing the device */
        iwl_pcie_prepare_card_hw(trans);
}

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

        if (trans_pcie->msix_enabled) {
                int i;

                for (i = 0; i < trans_pcie->alloc_vecs; i++)
                        synchronize_irq(trans_pcie->msix_entries[i].vector);
        } else {
                synchronize_irq(trans_pcie->pci_dev->irq);
        }
}

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);
        bool hw_rfkill;
        int ret;

        /* 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");
                ret = -EIO;
                goto out;
        }

        iwl_enable_rfkill_int(trans);

        iwl_write32(trans, CSR_INT, 0xFFFFFFFF);

        /*
         * We enabled the RF-Kill interrupt and the handler may very
         * well be running. Disable the interrupts to make sure no other
         * interrupt can be fired.
         */
        iwl_disable_interrupts(trans);

        /* Make sure it finished running */
        iwl_pcie_synchronize_irqs(trans);

        mutex_lock(&trans_pcie->mutex);

        /* If platform's RF_KILL switch is NOT set to KILL */
        hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
        if (hw_rfkill && !run_in_rfkill) {
                ret = -ERFKILL;
                goto out;
        }

        /* Someone called stop_device, don't try to start_fw */
        if (trans_pcie->is_down) {
                IWL_WARN(trans,
                         "Can't start_fw since the HW hasn't been started\n");
                ret = -EIO;
                goto out;
        }

        /* 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);

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

        /*
         * Now, we load the firmware and don't want to be interrupted, even
         * by the RF-Kill interrupt (hence mask all the interrupt besides the
         * FH_TX interrupt which is needed to load the firmware). If the
         * RF-Kill switch is toggled, we will find out after having loaded
         * the firmware and return the proper value to the caller.
         */
        iwl_enable_fw_load_int(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 */
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_8000)
                ret = iwl_pcie_load_given_ucode_8000(trans, fw);
        else
                ret = iwl_pcie_load_given_ucode(trans, fw);

        /* re-check RF-Kill state since we may have missed the interrupt */
        hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
        if (hw_rfkill && !run_in_rfkill)
                ret = -ERFKILL;

out:
        mutex_unlock(&trans_pcie->mutex);
        return ret;
}

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);
}

void iwl_trans_pcie_handle_stop_rfkill(struct iwl_trans *trans,
                                       bool was_in_rfkill)
{
        bool hw_rfkill;

        /*
         * 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.
         * Don't call the op_mode if the rkfill state hasn't changed.
         * This allows the op_mode to call stop_device from the rfkill
         * notification without endless recursion. Under very rare
         * circumstances, we might have a small recursion if the rfkill
         * state changed exactly now while we were called from stop_device.
         * This is very unlikely but can happen and is supported.
         */
        hw_rfkill = iwl_is_rfkill_set(trans);
        if (hw_rfkill) {
                set_bit(STATUS_RFKILL_HW, &trans->status);
                set_bit(STATUS_RFKILL_OPMODE, &trans->status);
        } else {
                clear_bit(STATUS_RFKILL_HW, &trans->status);
                clear_bit(STATUS_RFKILL_OPMODE, &trans->status);
        }
        if (hw_rfkill != was_in_rfkill)
                iwl_trans_pcie_rf_kill(trans, hw_rfkill);
}

static void iwl_trans_pcie_stop_device(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        bool was_in_rfkill;

        mutex_lock(&trans_pcie->mutex);
        trans_pcie->opmode_down = true;
        was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
        _iwl_trans_pcie_stop_device(trans);
        iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill);
        mutex_unlock(&trans_pcie->mutex);
}

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

        lockdep_assert_held(&trans_pcie->mutex);

        IWL_WARN(trans, "reporting RF_KILL (radio %s)\n",
                 state ? "disabled" : "enabled");
        if (iwl_op_mode_hw_rf_kill(trans->op_mode, state)) {
                if (trans->trans_cfg->gen2)
                        _iwl_trans_pcie_gen2_stop_device(trans);
                else
                        _iwl_trans_pcie_stop_device(trans);
        }
}

void iwl_pcie_d3_complete_suspend(struct iwl_trans *trans,
                                  bool test, bool reset)
{
        iwl_disable_interrupts(trans);

        /*
         * in testing mode, the host stays awake and the
         * hardware won't be reset (not even partially)
         */
        if (test)
                return;

        iwl_pcie_disable_ict(trans);

        iwl_pcie_synchronize_irqs(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);

        if (reset) {
                /*
                 * 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_suspend(struct iwl_trans *trans, bool test,
                                     bool reset)
{
        int ret;
        struct iwl_trans_pcie *trans_pcie =  IWL_TRANS_GET_PCIE_TRANS(trans);

        /*
         * Family IWL_DEVICE_FAMILY_AX210 and above persist mode is set by FW.
         */
        if (!reset && trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210) {
                /* Enable persistence mode to avoid reset */
                iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                            CSR_HW_IF_CONFIG_REG_PERSIST_MODE);
        }

        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) {
                iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
                                    UREG_DOORBELL_TO_ISR6_SUSPEND);

                ret = wait_event_timeout(trans_pcie->sx_waitq,
                                         trans_pcie->sx_complete, 2 * HZ);
                /*
                 * Invalidate it toward resume.
                 */
                trans_pcie->sx_complete = false;

                if (!ret) {
                        IWL_ERR(trans, "Timeout entering D3\n");
                        return -ETIMEDOUT;
                }
        }
        iwl_pcie_d3_complete_suspend(trans, test, reset);

        return 0;
}

static int iwl_trans_pcie_d3_resume(struct iwl_trans *trans,
                                    enum iwl_d3_status *status,
                                    bool test,  bool reset)
{
        struct iwl_trans_pcie *trans_pcie =  IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 val;
        int ret;

        if (test) {
                iwl_enable_interrupts(trans);
                *status = IWL_D3_STATUS_ALIVE;
                goto out;
        }

        iwl_set_bit(trans, CSR_GP_CNTRL,
                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);

        ret = iwl_finish_nic_init(trans, trans->trans_cfg);
        if (ret)
                return ret;

        /*
         * Reconfigure IVAR table in case of MSIX or reset ict table in
         * MSI mode since HW reset erased it.
         * 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_conf_msix_hw(trans_pcie);
        if (!trans_pcie->msix_enabled)
                iwl_pcie_reset_ict(trans);
        iwl_enable_interrupts(trans);

        iwl_pcie_set_pwr(trans, false);

        if (!reset) {
                iwl_clear_bit(trans, CSR_GP_CNTRL,
                              CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        } else {
                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_DEBUG_POWER(trans, "WFPM value upon resume = 0x%08X\n",
                        iwl_read_umac_prph(trans, WFPM_GP2));

        val = iwl_read32(trans, CSR_RESET);
        if (val & CSR_RESET_REG_FLAG_NEVO_RESET)
                *status = IWL_D3_STATUS_RESET;
        else
                *status = IWL_D3_STATUS_ALIVE;

out:
        if (*status == IWL_D3_STATUS_ALIVE &&
            trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210) {
                trans_pcie->sx_complete = false;
                iwl_write_umac_prph(trans, UREG_DOORBELL_TO_ISR6,
                                    UREG_DOORBELL_TO_ISR6_RESUME);

                ret = wait_event_timeout(trans_pcie->sx_waitq,
                                         trans_pcie->sx_complete, 2 * HZ);
                /*
                 * Invalidate it toward next suspend.
                 */
                trans_pcie->sx_complete = false;

                if (!ret) {
                        IWL_ERR(trans, "Timeout exiting D3\n");
                        return -ETIMEDOUT;
                }
        }
        return 0;
}

static void
iwl_pcie_set_interrupt_capa(struct pci_dev *pdev,
                            struct iwl_trans *trans,
                            const struct iwl_cfg_trans_params *cfg_trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int max_irqs, num_irqs, i, ret;
        u16 pci_cmd;

        if (!cfg_trans->mq_rx_supported)
                goto enable_msi;

        max_irqs = min_t(u32, num_online_cpus() + 2, IWL_MAX_RX_HW_QUEUES);
        for (i = 0; i < max_irqs; i++)
                trans_pcie->msix_entries[i].entry = i;

        num_irqs = pci_enable_msix_range(pdev, trans_pcie->msix_entries,
                                         MSIX_MIN_INTERRUPT_VECTORS,
                                         max_irqs);
        if (num_irqs < 0) {
                IWL_DEBUG_INFO(trans,
                               "Failed to enable msi-x mode (ret %d). Moving to msi mode.\n",
                               num_irqs);
                goto enable_msi;
        }
        trans_pcie->def_irq = (num_irqs == max_irqs) ? num_irqs - 1 : 0;

        IWL_DEBUG_INFO(trans,
                       "MSI-X enabled. %d interrupt vectors were allocated\n",
                       num_irqs);

        /*
         * In case the OS provides fewer interrupts than requested, different
         * causes will share the same interrupt vector as follows:
         * One interrupt less: non rx causes shared with FBQ.
         * Two interrupts less: non rx causes shared with FBQ and RSS.
         * More than two interrupts: we will use fewer RSS queues.
         */
        if (num_irqs <= max_irqs - 2) {
                trans_pcie->trans->num_rx_queues = num_irqs + 1;
                trans_pcie->shared_vec_mask = IWL_SHARED_IRQ_NON_RX |
                        IWL_SHARED_IRQ_FIRST_RSS;
        } else if (num_irqs == max_irqs - 1) {
                trans_pcie->trans->num_rx_queues = num_irqs;
                trans_pcie->shared_vec_mask = IWL_SHARED_IRQ_NON_RX;
        } else {
                trans_pcie->trans->num_rx_queues = num_irqs - 1;
        }
        WARN_ON(trans_pcie->trans->num_rx_queues > IWL_MAX_RX_HW_QUEUES);

        trans_pcie->alloc_vecs = num_irqs;
        trans_pcie->msix_enabled = true;
        return;

enable_msi:
        ret = pci_enable_msi(pdev);
        if (ret) {
                dev_err(&pdev->dev, "pci_enable_msi failed - %d\n", ret);
                /* 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);
                }
        }
}

static void iwl_pcie_irq_set_affinity(struct iwl_trans *trans)
{
        int iter_rx_q, i, ret, cpu, offset;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        i = trans_pcie->shared_vec_mask & IWL_SHARED_IRQ_FIRST_RSS ? 0 : 1;
        iter_rx_q = trans_pcie->trans->num_rx_queues - 1 + i;
        offset = 1 + i;
        for (; i < iter_rx_q ; i++) {
                /*
                 * Get the cpu prior to the place to search
                 * (i.e. return will be > i - 1).
                 */
                cpu = cpumask_next(i - offset, cpu_online_mask);
                cpumask_set_cpu(cpu, &trans_pcie->affinity_mask[i]);
                ret = irq_set_affinity_hint(trans_pcie->msix_entries[i].vector,
                                            &trans_pcie->affinity_mask[i]);
                if (ret)
                        IWL_ERR(trans_pcie->trans,
                                "Failed to set affinity mask for IRQ %d\n",
                                i);
        }
}

static int iwl_pcie_init_msix_handler(struct pci_dev *pdev,
                                      struct iwl_trans_pcie *trans_pcie)
{
        int i;

        for (i = 0; i < trans_pcie->alloc_vecs; i++) {
                int ret;
                struct msix_entry *msix_entry;
                const char *qname = queue_name(&pdev->dev, trans_pcie, i);

                if (!qname)
                        return -ENOMEM;

                msix_entry = &trans_pcie->msix_entries[i];
                ret = devm_request_threaded_irq(&pdev->dev,
                                                msix_entry->vector,
                                                iwl_pcie_msix_isr,
                                                (i == trans_pcie->def_irq) ?
                                                iwl_pcie_irq_msix_handler :
                                                iwl_pcie_irq_rx_msix_handler,
                                                IRQF_SHARED,
                                                qname,
                                                msix_entry);
                if (ret) {
                        IWL_ERR(trans_pcie->trans,
                                "Error allocating IRQ %d\n", i);

                        return ret;
                }
        }
        iwl_pcie_irq_set_affinity(trans_pcie->trans);

        return 0;
}

static int iwl_trans_pcie_clear_persistence_bit(struct iwl_trans *trans)
{
        u32 hpm, wprot;

        switch (trans->trans_cfg->device_family) {
        case IWL_DEVICE_FAMILY_9000:
                wprot = PREG_PRPH_WPROT_9000;
                break;
        case IWL_DEVICE_FAMILY_22000:
                wprot = PREG_PRPH_WPROT_22000;
                break;
        default:
                return 0;
        }

        hpm = iwl_read_umac_prph_no_grab(trans, HPM_DEBUG);
        if (hpm != 0xa5a5a5a0 && (hpm & PERSISTENCE_BIT)) {
                u32 wprot_val = iwl_read_umac_prph_no_grab(trans, wprot);

                if (wprot_val & PREG_WFPM_ACCESS) {
                        IWL_ERR(trans,
                                "Error, can not clear persistence bit\n");
                        return -EPERM;
                }
                iwl_write_umac_prph_no_grab(trans, HPM_DEBUG,
                                            hpm & ~PERSISTENCE_BIT);
        }

        return 0;
}

static int iwl_pcie_gen2_force_power_gating(struct iwl_trans *trans)
{
        int ret;

        ret = iwl_finish_nic_init(trans, trans->trans_cfg);
        if (ret < 0)
                return ret;

        iwl_set_bits_prph(trans, HPM_HIPM_GEN_CFG,
                          HPM_HIPM_GEN_CFG_CR_FORCE_ACTIVE);
        udelay(20);
        iwl_set_bits_prph(trans, HPM_HIPM_GEN_CFG,
                          HPM_HIPM_GEN_CFG_CR_PG_EN |
                          HPM_HIPM_GEN_CFG_CR_SLP_EN);
        udelay(20);
        iwl_clear_bits_prph(trans, HPM_HIPM_GEN_CFG,
                            HPM_HIPM_GEN_CFG_CR_FORCE_ACTIVE);

        iwl_trans_pcie_sw_reset(trans);

        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);
        int err;

        lockdep_assert_held(&trans_pcie->mutex);

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

        err = iwl_trans_pcie_clear_persistence_bit(trans);
        if (err)
                return err;

        iwl_trans_pcie_sw_reset(trans);

        if (trans->trans_cfg->device_family == IWL_DEVICE_FAMILY_22000 &&
            trans->cfg->integrated) {
                err = iwl_pcie_gen2_force_power_gating(trans);
                if (err)
                        return err;
        }

        err = iwl_pcie_apm_init(trans);
        if (err)
                return err;

        iwl_pcie_init_msix(trans_pcie);

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

        trans_pcie->opmode_down = false;

        /* Set is_down to false here so that...*/
        trans_pcie->is_down = false;

        /* ...rfkill can call stop_device and set it false if needed */
        iwl_pcie_check_hw_rf_kill(trans);

        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);
        int ret;

        mutex_lock(&trans_pcie->mutex);
        ret = _iwl_trans_pcie_start_hw(trans);
        mutex_unlock(&trans_pcie->mutex);

        return ret;
}

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

        mutex_lock(&trans_pcie->mutex);

        /* disable interrupts - don't enable HW RF kill interrupt */
        iwl_disable_interrupts(trans);

        iwl_pcie_apm_stop(trans, true);

        iwl_disable_interrupts(trans);

        iwl_pcie_disable_ict(trans);

        mutex_unlock(&trans_pcie->mutex);

        iwl_pcie_synchronize_irqs(trans);
}

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_prph_msk(struct iwl_trans *trans)
{
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
                return 0x00FFFFFF;
        else
                return 0x000FFFFF;
}

static u32 iwl_trans_pcie_read_prph(struct iwl_trans *trans, u32 reg)
{
        u32 mask = iwl_trans_pcie_prph_msk(trans);

        iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_RADDR,
                               ((reg & mask) | (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)
{
        u32 mask = iwl_trans_pcie_prph_msk(trans);

        iwl_trans_pcie_write32(trans, HBUS_TARG_PRPH_WADDR,
                               ((addr & mask) | (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;
        trans_pcie->cmd_q_wdg_timeout = trans_cfg->cmd_q_wdg_timeout;
        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 = trans_cfg->rx_buf_size;
        trans_pcie->rx_page_order =
                iwl_trans_get_rb_size_order(trans_pcie->rx_buf_size);
        trans_pcie->rx_buf_bytes =
                iwl_trans_get_rb_size(trans_pcie->rx_buf_size);
        trans_pcie->supported_dma_mask = DMA_BIT_MASK(12);
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
                trans_pcie->supported_dma_mask = DMA_BIT_MASK(11);

        trans_pcie->bc_table_dword = trans_cfg->bc_table_dword;
        trans_pcie->scd_set_active = trans_cfg->scd_set_active;
        trans_pcie->sw_csum_tx = trans_cfg->sw_csum_tx;

        trans_pcie->page_offs = trans_cfg->cb_data_offs;
        trans_pcie->dev_cmd_offs = trans_cfg->cb_data_offs + sizeof(void *);

        trans->command_groups = trans_cfg->command_groups;
        trans->command_groups_size = trans_cfg->command_groups_size;

        /* Initialize NAPI here - it should be before registering to mac80211
         * in the opmode but after the HW struct is allocated.
         * As this function may be called again in some corner cases don't
         * do anything if NAPI was already initialized.
         */
        if (trans_pcie->napi_dev.reg_state != NETREG_DUMMY)
                init_dummy_netdev(&trans_pcie->napi_dev);
}

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

        iwl_pcie_synchronize_irqs(trans);

        if (trans->trans_cfg->gen2)
                iwl_pcie_gen2_tx_free(trans);
        else
                iwl_pcie_tx_free(trans);
        iwl_pcie_rx_free(trans);

        if (trans_pcie->rba.alloc_wq) {
                destroy_workqueue(trans_pcie->rba.alloc_wq);
                trans_pcie->rba.alloc_wq = NULL;
        }

        if (trans_pcie->msix_enabled) {
                for (i = 0; i < trans_pcie->alloc_vecs; i++) {
                        irq_set_affinity_hint(
                                trans_pcie->msix_entries[i].vector,
                                NULL);
                }

                trans_pcie->msix_enabled = false;
        } else {
                iwl_pcie_free_ict(trans);
        }

        iwl_pcie_free_fw_monitor(trans);

        for_each_possible_cpu(i) {
                struct iwl_tso_hdr_page *p =
                        per_cpu_ptr(trans_pcie->tso_hdr_page, i);

                if (p->page)

                        __free_page(p->page);
        }

        free_percpu(trans_pcie->tso_hdr_page);
        mutex_destroy(&trans_pcie->mutex);
        iwl_trans_free(trans);
}

static void iwl_trans_pcie_set_pmi(struct iwl_trans *trans, bool state)
{
        if (state)
                set_bit(STATUS_TPOWER_PMI, &trans->status);
        else
                clear_bit(STATUS_TPOWER_PMI, &trans->status);
}

struct iwl_trans_pcie_removal {
        struct pci_dev *pdev;
        struct work_struct work;
};

static void iwl_trans_pcie_removal_wk(struct work_struct *wk)
{
        struct iwl_trans_pcie_removal *removal =
                container_of(wk, struct iwl_trans_pcie_removal, work);
        struct pci_dev *pdev = removal->pdev;
        static char *prop[] = {"EVENT=INACCESSIBLE", NULL};

        dev_err(&pdev->dev, "Device gone - attempting removal\n");
        kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, prop);
        pci_lock_rescan_remove();
        pci_dev_put(pdev);
        pci_stop_and_remove_bus_device(pdev);
        pci_unlock_rescan_remove();

        kfree(removal);
        module_put(THIS_MODULE);
}

static bool iwl_trans_pcie_grab_nic_access(struct iwl_trans *trans,
                                           unsigned long *flags)
{
        int ret;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        spin_lock_irqsave(&trans_pcie->reg_lock, *flags);

        if (trans_pcie->cmd_hold_nic_awake)
                goto out;

        /* this bit wakes up the NIC */
        __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
                                 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
        if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_8000)
                udelay(2);

        /*
         * 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;
         * HW with volatile SRAM 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 the SRAM of HW with
         * volatile 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)) {
                u32 cntrl = iwl_read32(trans, CSR_GP_CNTRL);

                WARN_ONCE(1,
                          "Timeout waiting for hardware access (CSR_GP_CNTRL 0x%08x)\n",
                          cntrl);

                iwl_trans_pcie_dump_regs(trans);

                if (iwlwifi_mod_params.remove_when_gone && cntrl == ~0U) {
                        struct iwl_trans_pcie_removal *removal;

                        if (test_bit(STATUS_TRANS_DEAD, &trans->status))
                                goto err;

                        IWL_ERR(trans, "Device gone - scheduling removal!\n");

                        /*
                         * get a module reference to avoid doing this
                         * while unloading anyway and to avoid
                         * scheduling a work with code that's being
                         * removed.
                         */
                        if (!try_module_get(THIS_MODULE)) {
                                IWL_ERR(trans,
                                        "Module is being unloaded - abort\n");
                                goto err;
                        }

                        removal = kzalloc(sizeof(*removal), GFP_ATOMIC);
                        if (!removal) {
                                module_put(THIS_MODULE);
                                goto err;
                        }
                        /*
                         * we don't need to clear this flag, because
                         * the trans will be freed and reallocated.
                        */
                        set_bit(STATUS_TRANS_DEAD, &trans->status);

                        removal->pdev = to_pci_dev(trans->dev);
                        INIT_WORK(&removal->work, iwl_trans_pcie_removal_wk);
                        pci_dev_get(removal->pdev);
                        schedule_work(&removal->work);
                } else {
                        iwl_write32(trans, CSR_RESET,
                                    CSR_RESET_REG_FLAG_FORCE_NMI);
                }

err:
                spin_unlock_irqrestore(&trans_pcie->reg_lock, *flags);
                return false;
        }

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

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

        lockdep_assert_held(&trans_pcie->reg_lock);

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

        if (trans_pcie->cmd_hold_nic_awake)
                goto out;

        __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).
         */
out:
        spin_unlock_irqrestore(&trans_pcie->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, &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,
                                    const void *buf, int dwords)
{
        unsigned long flags;
        int offs, ret = 0;
        const u32 *vals = buf;

        if (iwl_trans_grab_nic_access(trans, &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;
}

static void iwl_trans_pcie_freeze_txq_timer(struct iwl_trans *trans,
                                            unsigned long txqs,
                                            bool freeze)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int queue;

        for_each_set_bit(queue, &txqs, BITS_PER_LONG) {
                struct iwl_txq *txq = trans_pcie->txq[queue];
                unsigned long now;

                spin_lock_bh(&txq->lock);

                now = jiffies;

                if (txq->frozen == freeze)
                        goto next_queue;

                IWL_DEBUG_TX_QUEUES(trans, "%s TXQ %d\n",
                                    freeze ? "Freezing" : "Waking", queue);

                txq->frozen = freeze;

                if (txq->read_ptr == txq->write_ptr)
                        goto next_queue;

                if (freeze) {
                        if (unlikely(time_after(now,
                                                txq->stuck_timer.expires))) {
                                /*
                                 * The timer should have fired, maybe it is
                                 * spinning right now on the lock.
                                 */
                                goto next_queue;
                        }
                        /* remember how long until the timer fires */
                        txq->frozen_expiry_remainder =
                                txq->stuck_timer.expires - now;
                        del_timer(&txq->stuck_timer);
                        goto next_queue;
                }

                /*
                 * Wake a non-empty queue -> arm timer with the
                 * remainder before it froze
                 */
                mod_timer(&txq->stuck_timer,
                          now + txq->frozen_expiry_remainder);

next_queue:
                spin_unlock_bh(&txq->lock);
        }
}

static void iwl_trans_pcie_block_txq_ptrs(struct iwl_trans *trans, bool block)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int i;

        for (i = 0; i < trans->trans_cfg->base_params->num_of_queues; i++) {
                struct iwl_txq *txq = trans_pcie->txq[i];

                if (i == trans_pcie->cmd_queue)
                        continue;

                spin_lock_bh(&txq->lock);

                if (!block && !(WARN_ON_ONCE(!txq->block))) {
                        txq->block--;
                        if (!txq->block) {
                                iwl_write32(trans, HBUS_TARG_WRPTR,
                                            txq->write_ptr | (i << 8));
                        }
                } else if (block) {
                        txq->block++;
                }

                spin_unlock_bh(&txq->lock);
        }
}

#define IWL_FLUSH_WAIT_MS       2000

void iwl_trans_pcie_log_scd_error(struct iwl_trans *trans, struct iwl_txq *txq)
{
        u32 txq_id = txq->id;
        u32 status;
        bool active;
        u8 fifo;

        if (trans->trans_cfg->use_tfh) {
                IWL_ERR(trans, "Queue %d is stuck %d %d\n", txq_id,
                        txq->read_ptr, txq->write_ptr);
                /* TODO: access new SCD registers and dump them */
                return;
        }

        status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id));
        fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
        active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));

        IWL_ERR(trans,
                "Queue %d is %sactive on fifo %d and stuck for %u ms. SW [%d, %d] HW [%d, %d] FH TRB=0x0%x\n",
                txq_id, active ? "" : "in", fifo,
                jiffies_to_msecs(txq->wd_timeout),
                txq->read_ptr, txq->write_ptr,
                iwl_read_prph(trans, SCD_QUEUE_RDPTR(txq_id)) &
                        (trans->trans_cfg->base_params->max_tfd_queue_size - 1),
                        iwl_read_prph(trans, SCD_QUEUE_WRPTR(txq_id)) &
                        (trans->trans_cfg->base_params->max_tfd_queue_size - 1),
                        iwl_read_direct32(trans, FH_TX_TRB_REG(fifo)));
}

static int iwl_trans_pcie_rxq_dma_data(struct iwl_trans *trans, int queue,
                                       struct iwl_trans_rxq_dma_data *data)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        if (queue >= trans->num_rx_queues || !trans_pcie->rxq)
                return -EINVAL;

        data->fr_bd_cb = trans_pcie->rxq[queue].bd_dma;
        data->urbd_stts_wrptr = trans_pcie->rxq[queue].rb_stts_dma;
        data->ur_bd_cb = trans_pcie->rxq[queue].used_bd_dma;
        data->fr_bd_wid = 0;

        return 0;
}

static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans, int txq_idx)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_txq *txq;
        unsigned long now = jiffies;
        bool overflow_tx;
        u8 wr_ptr;

        /* Make sure the NIC is still alive in the bus */
        if (test_bit(STATUS_TRANS_DEAD, &trans->status))
                return -ENODEV;

        if (!test_bit(txq_idx, trans_pcie->queue_used))
                return -EINVAL;

        IWL_DEBUG_TX_QUEUES(trans, "Emptying queue %d...\n", txq_idx);
        txq = trans_pcie->txq[txq_idx];

        spin_lock_bh(&txq->lock);
        overflow_tx = txq->overflow_tx ||
                      !skb_queue_empty(&txq->overflow_q);
        spin_unlock_bh(&txq->lock);

        wr_ptr = READ_ONCE(txq->write_ptr);

        while ((txq->read_ptr != READ_ONCE(txq->write_ptr) ||
                overflow_tx) &&
               !time_after(jiffies,
                           now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS))) {
                u8 write_ptr = READ_ONCE(txq->write_ptr);

                /*
                 * If write pointer moved during the wait, warn only
                 * if the TX came from op mode. In case TX came from
                 * trans layer (overflow TX) don't warn.
                 */
                if (WARN_ONCE(wr_ptr != write_ptr && !overflow_tx,
                              "WR pointer moved while flushing %d -> %d\n",
                              wr_ptr, write_ptr))
                        return -ETIMEDOUT;
                wr_ptr = write_ptr;

                usleep_range(1000, 2000);

                spin_lock_bh(&txq->lock);
                overflow_tx = txq->overflow_tx ||
                              !skb_queue_empty(&txq->overflow_q);
                spin_unlock_bh(&txq->lock);
        }

        if (txq->read_ptr != txq->write_ptr) {
                IWL_ERR(trans,
                        "fail to flush all tx fifo queues Q %d\n", txq_idx);
                iwl_trans_pcie_log_scd_error(trans, txq);
                return -ETIMEDOUT;
        }

        IWL_DEBUG_TX_QUEUES(trans, "Queue %d is now empty.\n", txq_idx);

        return 0;
}

static int iwl_trans_pcie_wait_txqs_empty(struct iwl_trans *trans, u32 txq_bm)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int cnt;
        int ret = 0;

        /* waiting for all the tx frames complete might take a while */
        for (cnt = 0;
             cnt < trans->trans_cfg->base_params->num_of_queues;
             cnt++) {

                if (cnt == trans_pcie->cmd_queue)
                        continue;
                if (!test_bit(cnt, trans_pcie->queue_used))
                        continue;
                if (!(BIT(cnt) & txq_bm))
                        continue;

                ret = iwl_trans_pcie_wait_txq_empty(trans, cnt);
                if (ret)
                        break;
        }

        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_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_MONITOR_STATUS_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_MONITOR_STATUS_REG,
                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 {                       \
        debugfs_create_file(#name, mode, parent, trans,                 \
                            &iwl_dbgfs_##name##_ops);                   \
} while (0)

/* file operation */
#define DEBUGFS_READ_FILE_OPS(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)                                    \
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)                               \
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;
        char *buf;
        int pos = 0;
        int cnt;
        int ret;
        size_t bufsz;

        bufsz = sizeof(char) * 75 *
                trans->trans_cfg->base_params->num_of_queues;

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

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

        for (cnt = 0;
             cnt < trans->trans_cfg->base_params->num_of_queues;
             cnt++) {
                txq = trans_pcie->txq[cnt];
                pos += scnprintf(buf + pos, bufsz - pos,
                                "hwq %.2d: read=%u write=%u use=%d stop=%d need_update=%d frozen=%d%s\n",
                                cnt, txq->read_ptr, txq->write_ptr,
                                !!test_bit(cnt, trans_pcie->queue_used),
                                 !!test_bit(cnt, trans_pcie->queue_stopped),
                                 txq->need_update, txq->frozen,
                                 (cnt == trans_pcie->cmd_queue ? " HCMD" : ""));
        }
        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);
        char *buf;
        int pos = 0, i, ret;
        size_t bufsz;

        bufsz = sizeof(char) * 121 * trans->num_rx_queues;

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

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

        for (i = 0; i < trans->num_rx_queues && pos < bufsz; i++) {
                struct iwl_rxq *rxq = &trans_pcie->rxq[i];

                pos += scnprintf(buf + pos, bufsz - pos, "queue#: %2d\n",
                                 i);
                pos += scnprintf(buf + pos, bufsz - pos, "\tread: %u\n",
                                 rxq->read);
                pos += scnprintf(buf + pos, bufsz - pos, "\twrite: %u\n",
                                 rxq->write);
                pos += scnprintf(buf + pos, bufsz - pos, "\twrite_actual: %u\n",
                                 rxq->write_actual);
                pos += scnprintf(buf + pos, bufsz - pos, "\tneed_update: %2d\n",
                                 rxq->need_update);
                pos += scnprintf(buf + pos, bufsz - pos, "\tfree_count: %u\n",
                                 rxq->free_count);
                if (rxq->rb_stts) {
                        u32 r = __le16_to_cpu(iwl_get_closed_rb_stts(trans,
                                                                     rxq));
                        pos += scnprintf(buf + pos, bufsz - pos,
                                         "\tclosed_rb_num: %u\n",
                                         r & 0x0FFF);
                } else {
                        pos += scnprintf(buf + pos, bufsz - pos,
                                         "\tclosed_rb_num: Not Allocated\n");
                }
        }
        ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
        kfree(buf);

        return ret;
}

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;
        u32 reset_flag;
        int ret;

        ret = kstrtou32_from_user(user_buf, count, 16, &reset_flag);
        if (ret)
                return ret;
        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;

        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;
        ssize_t ret;

        ret = iwl_dump_fh(trans, &buf);
        if (ret < 0)
                return ret;
        if (!buf)
                return -EINVAL;
        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
        kfree(buf);
        return ret;
}

static ssize_t iwl_dbgfs_rfkill_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);
        char buf[100];
        int pos;

        pos = scnprintf(buf, sizeof(buf), "debug: %d\nhw: %d\n",
                        trans_pcie->debug_rfkill,
                        !(iwl_read32(trans, CSR_GP_CNTRL) &
                                CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW));

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

static ssize_t iwl_dbgfs_rfkill_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);
        bool new_value;
        int ret;

        ret = kstrtobool_from_user(user_buf, count, &new_value);
        if (ret)
                return ret;
        if (new_value == trans_pcie->debug_rfkill)
                return count;
        IWL_WARN(trans, "changing debug rfkill %d->%d\n",
                 trans_pcie->debug_rfkill, new_value);
        trans_pcie->debug_rfkill = new_value;
        iwl_pcie_handle_rfkill_irq(trans);

        return count;
}

static int iwl_dbgfs_monitor_data_open(struct inode *inode,
                                       struct file *file)
{
        struct iwl_trans *trans = inode->i_private;
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

        if (!trans->dbg.dest_tlv ||
            trans->dbg.dest_tlv->monitor_mode != EXTERNAL_MODE) {
                IWL_ERR(trans, "Debug destination is not set to DRAM\n");
                return -ENOENT;
        }

        if (trans_pcie->fw_mon_data.state != IWL_FW_MON_DBGFS_STATE_CLOSED)
                return -EBUSY;

        trans_pcie->fw_mon_data.state = IWL_FW_MON_DBGFS_STATE_OPEN;
        return simple_open(inode, file);
}

static int iwl_dbgfs_monitor_data_release(struct inode *inode,
                                          struct file *file)
{
        struct iwl_trans_pcie *trans_pcie =
                IWL_TRANS_GET_PCIE_TRANS(inode->i_private);

        if (trans_pcie->fw_mon_data.state == IWL_FW_MON_DBGFS_STATE_OPEN)
                trans_pcie->fw_mon_data.state = IWL_FW_MON_DBGFS_STATE_CLOSED;
        return 0;
}

static bool iwl_write_to_user_buf(char __user *user_buf, ssize_t count,
                                  void *buf, ssize_t *size,
                                  ssize_t *bytes_copied)
{
        int buf_size_left = count - *bytes_copied;

        buf_size_left = buf_size_left - (buf_size_left % sizeof(u32));
        if (*size > buf_size_left)
                *size = buf_size_left;

        *size -= copy_to_user(user_buf, buf, *size);
        *bytes_copied += *size;

        if (buf_size_left == *size)
                return true;
        return false;
}

static ssize_t iwl_dbgfs_monitor_data_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);
        void *cpu_addr = (void *)trans->dbg.fw_mon.block, *curr_buf;
        struct cont_rec *data = &trans_pcie->fw_mon_data;
        u32 write_ptr_addr, wrap_cnt_addr, write_ptr, wrap_cnt;
        ssize_t size, bytes_copied = 0;
        bool b_full;

        if (trans->dbg.dest_tlv) {
                write_ptr_addr =
                        le32_to_cpu(trans->dbg.dest_tlv->write_ptr_reg);
                wrap_cnt_addr = le32_to_cpu(trans->dbg.dest_tlv->wrap_count);
        } else {
                write_ptr_addr = MON_BUFF_WRPTR;
                wrap_cnt_addr = MON_BUFF_CYCLE_CNT;
        }

        if (unlikely(!trans->dbg.rec_on))
                return 0;

        mutex_lock(&data->mutex);
        if (data->state ==
            IWL_FW_MON_DBGFS_STATE_DISABLED) {
                mutex_unlock(&data->mutex);
                return 0;
        }

        /* write_ptr position in bytes rather then DW */
        write_ptr = iwl_read_prph(trans, write_ptr_addr) * sizeof(u32);
        wrap_cnt = iwl_read_prph(trans, wrap_cnt_addr);

        if (data->prev_wrap_cnt == wrap_cnt) {
                size = write_ptr - data->prev_wr_ptr;
                curr_buf = cpu_addr + data->prev_wr_ptr;
                b_full = iwl_write_to_user_buf(user_buf, count,
                                               curr_buf, &size,
                                               &bytes_copied);
                data->prev_wr_ptr += size;

        } else if (data->prev_wrap_cnt == wrap_cnt - 1 &&
                   write_ptr < data->prev_wr_ptr) {
                size = trans->dbg.fw_mon.size - data->prev_wr_ptr;
                curr_buf = cpu_addr + data->prev_wr_ptr;
                b_full = iwl_write_to_user_buf(user_buf, count,
                                               curr_buf, &size,
                                               &bytes_copied);
                data->prev_wr_ptr += size;

                if (!b_full) {
                        size = write_ptr;
                        b_full = iwl_write_to_user_buf(user_buf, count,
                                                       cpu_addr, &size,
                                                       &bytes_copied);
                        data->prev_wr_ptr = size;
                        data->prev_wrap_cnt++;
                }
        } else {
                if (data->prev_wrap_cnt == wrap_cnt - 1 &&
                    write_ptr > data->prev_wr_ptr)
                        IWL_WARN(trans,
                                 "write pointer passed previous write pointer, start copying from the beginning\n");
                else if (!unlikely(data->prev_wrap_cnt == 0 &&
                                   data->prev_wr_ptr == 0))
                        IWL_WARN(trans,
                                 "monitor data is out of sync, start copying from the beginning\n");

                size = write_ptr;
                b_full = iwl_write_to_user_buf(user_buf, count,
                                               cpu_addr, &size,
                                               &bytes_copied);
                data->prev_wr_ptr = size;
                data->prev_wrap_cnt = wrap_cnt;
        }

        mutex_unlock(&data->mutex);

        return bytes_copied;
}

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);
DEBUGFS_READ_WRITE_FILE_OPS(rfkill);

static const struct file_operations iwl_dbgfs_monitor_data_ops = {
        .read = iwl_dbgfs_monitor_data_read,
        .open = iwl_dbgfs_monitor_data_open,
        .release = iwl_dbgfs_monitor_data_release,
};

/* Create the debugfs files and directories */
void iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans)
{
        struct dentry *dir = trans->dbgfs_dir;

        DEBUGFS_ADD_FILE(rx_queue, dir, 0400);
        DEBUGFS_ADD_FILE(tx_queue, dir, 0400);
        DEBUGFS_ADD_FILE(interrupt, dir, 0600);
        DEBUGFS_ADD_FILE(csr, dir, 0200);
        DEBUGFS_ADD_FILE(fh_reg, dir, 0400);
        DEBUGFS_ADD_FILE(rfkill, dir, 0600);
        DEBUGFS_ADD_FILE(monitor_data, dir, 0400);
}

static void iwl_trans_pcie_debugfs_cleanup(struct iwl_trans *trans)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct cont_rec *data = &trans_pcie->fw_mon_data;

        mutex_lock(&data->mutex);
        data->state = IWL_FW_MON_DBGFS_STATE_DISABLED;
        mutex_unlock(&data->mutex);
}
#endif /*CONFIG_IWLWIFI_DEBUGFS */

static u32 iwl_trans_pcie_get_cmdlen(struct iwl_trans *trans, void *tfd)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        u32 cmdlen = 0;
        int i;

        for (i = 0; i < trans_pcie->max_tbs; i++)
                cmdlen += iwl_pcie_tfd_tb_get_len(trans, tfd, i);

        return cmdlen;
}

static u32 iwl_trans_pcie_dump_rbs(struct iwl_trans *trans,
                                   struct iwl_fw_error_dump_data **data,
                                   int allocated_rb_nums)
{
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        int max_len = trans_pcie->rx_buf_bytes;
        /* Dump RBs is supported only for pre-9000 devices (1 queue) */
        struct iwl_rxq *rxq = &trans_pcie->rxq[0];
        u32 i, r, j, rb_len = 0;

        spin_lock(&rxq->lock);

        r = le16_to_cpu(iwl_get_closed_rb_stts(trans, rxq)) & 0x0FFF;

        for (i = rxq->read, j = 0;
             i != r && j < allocated_rb_nums;
             i = (i + 1) & RX_QUEUE_MASK, j++) {
                struct iwl_rx_mem_buffer *rxb = rxq->queue[i];
                struct iwl_fw_error_dump_rb *rb;

                dma_unmap_page(trans->dev, rxb->page_dma, max_len,
                               DMA_FROM_DEVICE);

                rb_len += sizeof(**data) + sizeof(*rb) + max_len;

                (*data)->type = cpu_to_le32(IWL_FW_ERROR_DUMP_RB);
                (*data)->len = cpu_to_le32(sizeof(*rb) + max_len);
                rb = (void *)(*data)->data;
                rb->index = cpu_to_le32(i);
                memcpy(rb->data, page_address(rxb->page), max_len);
                /* remap the page for the free benefit */
                rxb->page_dma = dma_map_page(trans->dev, rxb->page,
                                             rxb->offset, max_len,
                                             DMA_FROM_DEVICE);

                *data = iwl_fw_error_next_data(*data);
        }

        spin_unlock(&rxq->lock);

        return rb_len;
}
#define IWL_CSR_TO_DUMP (0x250)