/*
 * This file is part of the Chelsio FCoE driver for Linux.
 *
 * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/firmware.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/compiler.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/log2.h>

#include "csio_hw.h"
#include "csio_lnode.h"
#include "csio_rnode.h"

int csio_force_master;
int csio_dbg_level = 0xFEFF;
unsigned int csio_port_mask = 0xf;

/* Default FW event queue entries. */
static uint32_t csio_evtq_sz = CSIO_EVTQ_SIZE;

/* Default MSI param level */
int csio_msi = 2;

/* FCoE function instances */
static int dev_num;

/* FCoE Adapter types & its description */
static const struct csio_adap_desc csio_t4_fcoe_adapters[] = {
        {"T440-Dbg 10G", "Chelsio T440-Dbg 10G [FCoE]"},
        {"T420-CR 10G", "Chelsio T420-CR 10G [FCoE]"},
        {"T422-CR 10G/1G", "Chelsio T422-CR 10G/1G [FCoE]"},
        {"T440-CR 10G", "Chelsio T440-CR 10G [FCoE]"},
        {"T420-BCH 10G", "Chelsio T420-BCH 10G [FCoE]"},
        {"T440-BCH 10G", "Chelsio T440-BCH 10G [FCoE]"},
        {"T440-CH 10G", "Chelsio T440-CH 10G [FCoE]"},
        {"T420-SO 10G", "Chelsio T420-SO 10G [FCoE]"},
        {"T420-CX4 10G", "Chelsio T420-CX4 10G [FCoE]"},
        {"T420-BT 10G", "Chelsio T420-BT 10G [FCoE]"},
        {"T404-BT 1G", "Chelsio T404-BT 1G [FCoE]"},
        {"B420-SR 10G", "Chelsio B420-SR 10G [FCoE]"},
        {"B404-BT 1G", "Chelsio B404-BT 1G [FCoE]"},
        {"T480-CR 10G", "Chelsio T480-CR 10G [FCoE]"},
        {"T440-LP-CR 10G", "Chelsio T440-LP-CR 10G [FCoE]"},
        {"AMSTERDAM 10G", "Chelsio AMSTERDAM 10G [FCoE]"},
        {"HUAWEI T480 10G", "Chelsio HUAWEI T480 10G [FCoE]"},
        {"HUAWEI T440 10G", "Chelsio HUAWEI T440 10G [FCoE]"},
        {"HUAWEI STG 10G", "Chelsio HUAWEI STG 10G [FCoE]"},
        {"ACROMAG XAUI 10G", "Chelsio ACROMAG XAUI 10G [FCoE]"},
        {"ACROMAG SFP+ 10G", "Chelsio ACROMAG SFP+ 10G [FCoE]"},
        {"QUANTA SFP+ 10G", "Chelsio QUANTA SFP+ 10G [FCoE]"},
        {"HUAWEI 10Gbase-T", "Chelsio HUAWEI 10Gbase-T [FCoE]"},
        {"HUAWEI T4TOE 10G", "Chelsio HUAWEI T4TOE 10G [FCoE]"}
};

static const struct csio_adap_desc csio_t5_fcoe_adapters[] = {
        {"T580-Dbg 10G", "Chelsio T580-Dbg 10G [FCoE]"},
        {"T520-CR 10G", "Chelsio T520-CR 10G [FCoE]"},
        {"T522-CR 10G/1G", "Chelsio T452-CR 10G/1G [FCoE]"},
        {"T540-CR 10G", "Chelsio T540-CR 10G [FCoE]"},
        {"T520-BCH 10G", "Chelsio T520-BCH 10G [FCoE]"},
        {"T540-BCH 10G", "Chelsio T540-BCH 10G [FCoE]"},
        {"T540-CH 10G", "Chelsio T540-CH 10G [FCoE]"},
        {"T520-SO 10G", "Chelsio T520-SO 10G [FCoE]"},
        {"T520-CX4 10G", "Chelsio T520-CX4 10G [FCoE]"},
        {"T520-BT 10G", "Chelsio T520-BT 10G [FCoE]"},
        {"T504-BT 1G", "Chelsio T504-BT 1G [FCoE]"},
        {"B520-SR 10G", "Chelsio B520-SR 10G [FCoE]"},
        {"B504-BT 1G", "Chelsio B504-BT 1G [FCoE]"},
        {"T580-CR 10G", "Chelsio T580-CR 10G [FCoE]"},
        {"T540-LP-CR 10G", "Chelsio T540-LP-CR 10G [FCoE]"},
        {"AMSTERDAM 10G", "Chelsio AMSTERDAM 10G [FCoE]"},
        {"T580-LP-CR 40G", "Chelsio T580-LP-CR 40G [FCoE]"},
        {"T520-LL-CR 10G", "Chelsio T520-LL-CR 10G [FCoE]"},
        {"T560-CR 40G", "Chelsio T560-CR 40G [FCoE]"},
        {"T580-CR 40G", "Chelsio T580-CR 40G [FCoE]"}
};

static void csio_mgmtm_cleanup(struct csio_mgmtm *);
static void csio_hw_mbm_cleanup(struct csio_hw *);

/* State machine forward declarations */
static void csio_hws_uninit(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_configuring(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_initializing(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_ready(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_quiescing(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_quiesced(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_resetting(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_removing(struct csio_hw *, enum csio_hw_ev);
static void csio_hws_pcierr(struct csio_hw *, enum csio_hw_ev);

static void csio_hw_initialize(struct csio_hw *hw);
static void csio_evtq_stop(struct csio_hw *hw);
static void csio_evtq_start(struct csio_hw *hw);

int csio_is_hw_ready(struct csio_hw *hw)
{
        return csio_match_state(hw, csio_hws_ready);
}

int csio_is_hw_removing(struct csio_hw *hw)
{
        return csio_match_state(hw, csio_hws_removing);
}


/*
 *      csio_hw_wait_op_done_val - wait until an operation is completed
 *      @hw: the HW module
 *      @reg: the register to check for completion
 *      @mask: a single-bit field within @reg that indicates completion
 *      @polarity: the value of the field when the operation is completed
 *      @attempts: number of check iterations
 *      @delay: delay in usecs between iterations
 *      @valp: where to store the value of the register at completion time
 *
 *      Wait until an operation is completed by checking a bit in a register
 *      up to @attempts times.  If @valp is not NULL the value of the register
 *      at the time it indicated completion is stored there.  Returns 0 if the
 *      operation completes and -EAGAIN otherwise.
 */
int
csio_hw_wait_op_done_val(struct csio_hw *hw, int reg, uint32_t mask,
                         int polarity, int attempts, int delay, uint32_t *valp)
{
        uint32_t val;
        while (1) {
                val = csio_rd_reg32(hw, reg);

                if (!!(val & mask) == polarity) {
                        if (valp)
                                *valp = val;
                        return 0;
                }

                if (--attempts == 0)
                        return -EAGAIN;
                if (delay)
                        udelay(delay);
        }
}

/*
 *      csio_hw_tp_wr_bits_indirect - set/clear bits in an indirect TP register
 *      @hw: the adapter
 *      @addr: the indirect TP register address
 *      @mask: specifies the field within the register to modify
 *      @val: new value for the field
 *
 *      Sets a field of an indirect TP register to the given value.
 */
void
csio_hw_tp_wr_bits_indirect(struct csio_hw *hw, unsigned int addr,
                        unsigned int mask, unsigned int val)
{
        csio_wr_reg32(hw, addr, TP_PIO_ADDR);
        val |= csio_rd_reg32(hw, TP_PIO_DATA) & ~mask;
        csio_wr_reg32(hw, val, TP_PIO_DATA);
}

void
csio_set_reg_field(struct csio_hw *hw, uint32_t reg, uint32_t mask,
                   uint32_t value)
{
        uint32_t val = csio_rd_reg32(hw, reg) & ~mask;

        csio_wr_reg32(hw, val | value, reg);
        /* Flush */
        csio_rd_reg32(hw, reg);

}

static int
csio_memory_write(struct csio_hw *hw, int mtype, u32 addr, u32 len, u32 *buf)
{
        return hw->chip_ops->chip_memory_rw(hw, MEMWIN_CSIOSTOR, mtype,
                                            addr, len, buf, 0);
}

/*
 * EEPROM reads take a few tens of us while writes can take a bit over 5 ms.
 */
#define EEPROM_MAX_RD_POLL      40
#define EEPROM_MAX_WR_POLL      6
#define EEPROM_STAT_ADDR        0x7bfc
#define VPD_BASE                0x400
#define VPD_BASE_OLD            0
#define VPD_LEN                 1024
#define VPD_INFO_FLD_HDR_SIZE   3

/*
 *      csio_hw_seeprom_read - read a serial EEPROM location
 *      @hw: hw to read
 *      @addr: EEPROM virtual address
 *      @data: where to store the read data
 *
 *      Read a 32-bit word from a location in serial EEPROM using the card's PCI
 *      VPD capability.  Note that this function must be called with a virtual
 *      address.
 */
static int
csio_hw_seeprom_read(struct csio_hw *hw, uint32_t addr, uint32_t *data)
{
        uint16_t val = 0;
        int attempts = EEPROM_MAX_RD_POLL;
        uint32_t base = hw->params.pci.vpd_cap_addr;

        if (addr >= EEPROMVSIZE || (addr & 3))
                return -EINVAL;

        pci_write_config_word(hw->pdev, base + PCI_VPD_ADDR, (uint16_t)addr);

        do {
                udelay(10);
                pci_read_config_word(hw->pdev, base + PCI_VPD_ADDR, &val);
        } while (!(val & PCI_VPD_ADDR_F) && --attempts);

        if (!(val & PCI_VPD_ADDR_F)) {
                csio_err(hw, "reading EEPROM address 0x%x failed\n", addr);
                return -EINVAL;
        }

        pci_read_config_dword(hw->pdev, base + PCI_VPD_DATA, data);
        *data = le32_to_cpu(*data);

        return 0;
}

/*
 * Partial EEPROM Vital Product Data structure.  Includes only the ID and
 * VPD-R sections.
 */
struct t4_vpd_hdr {
        u8  id_tag;
        u8  id_len[2];
        u8  id_data[ID_LEN];
        u8  vpdr_tag;
        u8  vpdr_len[2];
};

/*
 *      csio_hw_get_vpd_keyword_val - Locates an information field keyword in
 *                                    the VPD
 *      @v: Pointer to buffered vpd data structure
 *      @kw: The keyword to search for
 *
 *      Returns the value of the information field keyword or
 *      -EINVAL otherwise.
 */
static int
csio_hw_get_vpd_keyword_val(const struct t4_vpd_hdr *v, const char *kw)
{
        int32_t i;
        int32_t offset , len;
        const uint8_t *buf = &v->id_tag;
        const uint8_t *vpdr_len = &v->vpdr_tag;
        offset = sizeof(struct t4_vpd_hdr);
        len =  (uint16_t)vpdr_len[1] + ((uint16_t)vpdr_len[2] << 8);

        if (len + sizeof(struct t4_vpd_hdr) > VPD_LEN)
                return -EINVAL;

        for (i = offset; (i + VPD_INFO_FLD_HDR_SIZE) <= (offset + len);) {
                if (memcmp(buf + i , kw, 2) == 0) {
                        i += VPD_INFO_FLD_HDR_SIZE;
                        return i;
                }

                i += VPD_INFO_FLD_HDR_SIZE + buf[i+2];
        }

        return -EINVAL;
}

static int
csio_pci_capability(struct pci_dev *pdev, int cap, int *pos)
{
        *pos = pci_find_capability(pdev, cap);
        if (*pos)
                return 0;

        return -1;
}

/*
 *      csio_hw_get_vpd_params - read VPD parameters from VPD EEPROM
 *      @hw: HW module
 *      @p: where to store the parameters
 *
 *      Reads card parameters stored in VPD EEPROM.
 */
static int
csio_hw_get_vpd_params(struct csio_hw *hw, struct csio_vpd *p)
{
        int i, ret, ec, sn, addr;
        uint8_t *vpd, csum;
        const struct t4_vpd_hdr *v;
        /* To get around compilation warning from strstrip */
        char *s;

        if (csio_is_valid_vpd(hw))
                return 0;

        ret = csio_pci_capability(hw->pdev, PCI_CAP_ID_VPD,
                                  &hw->params.pci.vpd_cap_addr);
        if (ret)
                return -EINVAL;

        vpd = kzalloc(VPD_LEN, GFP_ATOMIC);
        if (vpd == NULL)
                return -ENOMEM;

        /*
         * Card information normally starts at VPD_BASE but early cards had
         * it at 0.
         */
        ret = csio_hw_seeprom_read(hw, VPD_BASE, (uint32_t *)(vpd));
        addr = *vpd == 0x82 ? VPD_BASE : VPD_BASE_OLD;

        for (i = 0; i < VPD_LEN; i += 4) {
                ret = csio_hw_seeprom_read(hw, addr + i, (uint32_t *)(vpd + i));
                if (ret) {
                        kfree(vpd);
                        return ret;
                }
        }

        /* Reset the VPD flag! */
        hw->flags &= (~CSIO_HWF_VPD_VALID);

        v = (const struct t4_vpd_hdr *)vpd;

#define FIND_VPD_KW(var, name) do { \
        var = csio_hw_get_vpd_keyword_val(v, name); \
        if (var < 0) { \
                csio_err(hw, "missing VPD keyword " name "\n"); \
                kfree(vpd); \
                return -EINVAL; \
        } \
} while (0)

        FIND_VPD_KW(i, "RV");
        for (csum = 0; i >= 0; i--)
                csum += vpd[i];

        if (csum) {
                csio_err(hw, "corrupted VPD EEPROM, actual csum %u\n", csum);
                kfree(vpd);
                return -EINVAL;
        }
        FIND_VPD_KW(ec, "EC");
        FIND_VPD_KW(sn, "SN");
#undef FIND_VPD_KW

        memcpy(p->id, v->id_data, ID_LEN);
        s = strstrip(p->id);
        memcpy(p->ec, vpd + ec, EC_LEN);
        s = strstrip(p->ec);
        i = vpd[sn - VPD_INFO_FLD_HDR_SIZE + 2];
        memcpy(p->sn, vpd + sn, min(i, SERNUM_LEN));
        s = strstrip(p->sn);

        csio_valid_vpd_copied(hw);

        kfree(vpd);
        return 0;
}

/*
 *      csio_hw_sf1_read - read data from the serial flash
 *      @hw: the HW module
 *      @byte_cnt: number of bytes to read
 *      @cont: whether another operation will be chained
 *      @lock: whether to lock SF for PL access only
 *      @valp: where to store the read data
 *
 *      Reads up to 4 bytes of data from the serial flash.  The location of
 *      the read needs to be specified prior to calling this by issuing the
 *      appropriate commands to the serial flash.
 */
static int
csio_hw_sf1_read(struct csio_hw *hw, uint32_t byte_cnt, int32_t cont,
                 int32_t lock, uint32_t *valp)
{
        int ret;

        if (!byte_cnt || byte_cnt > 4)
                return -EINVAL;
        if (csio_rd_reg32(hw, SF_OP) & SF_BUSY)
                return -EBUSY;

        cont = cont ? SF_CONT : 0;
        lock = lock ? SF_LOCK : 0;

        csio_wr_reg32(hw, lock | cont | BYTECNT(byte_cnt - 1), SF_OP);
        ret = csio_hw_wait_op_done_val(hw, SF_OP, SF_BUSY, 0, SF_ATTEMPTS,
                                         10, NULL);
        if (!ret)
                *valp = csio_rd_reg32(hw, SF_DATA);
        return ret;
}

/*
 *      csio_hw_sf1_write - write data to the serial flash
 *      @hw: the HW module
 *      @byte_cnt: number of bytes to write
 *      @cont: whether another operation will be chained
 *      @lock: whether to lock SF for PL access only
 *      @val: value to write
 *
 *      Writes up to 4 bytes of data to the serial flash.  The location of
 *      the write needs to be specified prior to calling this by issuing the
 *      appropriate commands to the serial flash.
 */
static int
csio_hw_sf1_write(struct csio_hw *hw, uint32_t byte_cnt, uint32_t cont,
                  int32_t lock, uint32_t val)
{
        if (!byte_cnt || byte_cnt > 4)
                return -EINVAL;
        if (csio_rd_reg32(hw, SF_OP) & SF_BUSY)
                return -EBUSY;

        cont = cont ? SF_CONT : 0;
        lock = lock ? SF_LOCK : 0;

        csio_wr_reg32(hw, val, SF_DATA);
        csio_wr_reg32(hw, cont | BYTECNT(byte_cnt - 1) | OP_WR | lock, SF_OP);

        return csio_hw_wait_op_done_val(hw, SF_OP, SF_BUSY, 0, SF_ATTEMPTS,
                                        10, NULL);
}

/*
 *      csio_hw_flash_wait_op - wait for a flash operation to complete
 *      @hw: the HW module
 *      @attempts: max number of polls of the status register
 *      @delay: delay between polls in ms
 *
 *      Wait for a flash operation to complete by polling the status register.
 */
static int
csio_hw_flash_wait_op(struct csio_hw *hw, int32_t attempts, int32_t delay)
{
        int ret;
        uint32_t status;

        while (1) {
                ret = csio_hw_sf1_write(hw, 1, 1, 1, SF_RD_STATUS);
                if (ret != 0)
                        return ret;

                ret = csio_hw_sf1_read(hw, 1, 0, 1, &status);
                if (ret != 0)
                        return ret;

                if (!(status & 1))
                        return 0;
                if (--attempts == 0)
                        return -EAGAIN;
                if (delay)
                        msleep(delay);
        }
}

/*
 *      csio_hw_read_flash - read words from serial flash
 *      @hw: the HW module
 *      @addr: the start address for the read
 *      @nwords: how many 32-bit words to read
 *      @data: where to store the read data
 *      @byte_oriented: whether to store data as bytes or as words
 *
 *      Read the specified number of 32-bit words from the serial flash.
 *      If @byte_oriented is set the read data is stored as a byte array
 *      (i.e., big-endian), otherwise as 32-bit words in the platform's
 *      natural endianess.
 */
static int
csio_hw_read_flash(struct csio_hw *hw, uint32_t addr, uint32_t nwords,
                  uint32_t *data, int32_t byte_oriented)
{
        int ret;

        if (addr + nwords * sizeof(uint32_t) > hw->params.sf_size || (addr & 3))
                return -EINVAL;

        addr = swab32(addr) | SF_RD_DATA_FAST;

        ret = csio_hw_sf1_write(hw, 4, 1, 0, addr);
        if (ret != 0)
                return ret;

        ret = csio_hw_sf1_read(hw, 1, 1, 0, data);
        if (ret != 0)
                return ret;

        for ( ; nwords; nwords--, data++) {
                ret = csio_hw_sf1_read(hw, 4, nwords > 1, nwords == 1, data);
                if (nwords == 1)
                        csio_wr_reg32(hw, 0, SF_OP);    /* unlock SF */
                if (ret)
                        return ret;
                if (byte_oriented)
                        *data = htonl(*data);
        }
        return 0;
}

/*
 *      csio_hw_write_flash - write up to a page of data to the serial flash
 *      @hw: the hw
 *      @addr: the start address to write
 *      @n: length of data to write in bytes
 *      @data: the data to write
 *
 *      Writes up to a page of data (256 bytes) to the serial flash starting
 *      at the given address.  All the data must be written to the same page.
 */
static int
csio_hw_write_flash(struct csio_hw *hw, uint32_t addr,
                    uint32_t n, const uint8_t *data)
{
        int ret = -EINVAL;
        uint32_t buf[64];
        uint32_t i, c, left, val, offset = addr & 0xff;

        if (addr >= hw->params.sf_size || offset + n > SF_PAGE_SIZE)
                return -EINVAL;

        val = swab32(addr) | SF_PROG_PAGE;

        ret = csio_hw_sf1_write(hw, 1, 0, 1, SF_WR_ENABLE);
        if (ret != 0)
                goto unlock;

        ret = csio_hw_sf1_write(hw, 4, 1, 1, val);
        if (ret != 0)
                goto unlock;

        for (left = n; left; left -= c) {
                c = min(left, 4U);
                for (val = 0, i = 0; i < c; ++i)
                        val = (val << 8) + *data++;

                ret = csio_hw_sf1_write(hw, c, c != left, 1, val);
                if (ret)
                        goto unlock;
        }
        ret = csio_hw_flash_wait_op(hw, 8, 1);
        if (ret)
                goto unlock;

        csio_wr_reg32(hw, 0, SF_OP);    /* unlock SF */

        /* Read the page to verify the write succeeded */
        ret = csio_hw_read_flash(hw, addr & ~0xff, ARRAY_SIZE(buf), buf, 1);
        if (ret)
                return ret;

        if (memcmp(data - n, (uint8_t *)buf + offset, n)) {
                csio_err(hw,
                         "failed to correctly write the flash page at %#x\n",
                         addr);
                return -EINVAL;
        }

        return 0;

unlock:
        csio_wr_reg32(hw, 0, SF_OP);    /* unlock SF */
        return ret;
}

/*
 *      csio_hw_flash_erase_sectors - erase a range of flash sectors
 *      @hw: the HW module
 *      @start: the first sector to erase
 *      @end: the last sector to erase
 *
 *      Erases the sectors in the given inclusive range.
 */
static int
csio_hw_flash_erase_sectors(struct csio_hw *hw, int32_t start, int32_t end)
{
        int ret = 0;

        while (start <= end) {

                ret = csio_hw_sf1_write(hw, 1, 0, 1, SF_WR_ENABLE);
                if (ret != 0)
                        goto out;

                ret = csio_hw_sf1_write(hw, 4, 0, 1,
                                        SF_ERASE_SECTOR | (start << 8));
                if (ret != 0)
                        goto out;

                ret = csio_hw_flash_wait_op(hw, 14, 500);
                if (ret != 0)
                        goto out;

                start++;
        }
out:
        if (ret)
                csio_err(hw, "erase of flash sector %d failed, error %d\n",
                         start, ret);
        csio_wr_reg32(hw, 0, SF_OP);    /* unlock SF */
        return 0;
}

static void
csio_hw_print_fw_version(struct csio_hw *hw, char *str)
{
        csio_info(hw, "%s: %u.%u.%u.%u\n", str,
                    FW_HDR_FW_VER_MAJOR_GET(hw->fwrev),
                    FW_HDR_FW_VER_MINOR_GET(hw->fwrev),
                    FW_HDR_FW_VER_MICRO_GET(hw->fwrev),
                    FW_HDR_FW_VER_BUILD_GET(hw->fwrev));
}

/*
 * csio_hw_get_fw_version - read the firmware version
 * @hw: HW module
 * @vers: where to place the version
 *
 * Reads the FW version from flash.
 */
static int
csio_hw_get_fw_version(struct csio_hw *hw, uint32_t *vers)
{
        return csio_hw_read_flash(hw, FW_IMG_START +
                                  offsetof(struct fw_hdr, fw_ver), 1,
                                  vers, 0);
}

/*
 *      csio_hw_get_tp_version - read the TP microcode version
 *      @hw: HW module
 *      @vers: where to place the version
 *
 *      Reads the TP microcode version from flash.
 */
static int
csio_hw_get_tp_version(struct csio_hw *hw, u32 *vers)
{
        return csio_hw_read_flash(hw, FLASH_FW_START +
                        offsetof(struct fw_hdr, tp_microcode_ver), 1,
                        vers, 0);
}

/*
 *      csio_hw_check_fw_version - check if the FW is compatible with
 *                                 this driver
 *      @hw: HW module
 *
 *      Checks if an adapter's FW is compatible with the driver.  Returns 0
 *      if there's exact match, a negative error if the version could not be
 *      read or there's a major/minor version mismatch/minor.
 */
static int
csio_hw_check_fw_version(struct csio_hw *hw)
{
        int ret, major, minor, micro;

        ret = csio_hw_get_fw_version(hw, &hw->fwrev);
        if (!ret)
                ret = csio_hw_get_tp_version(hw, &hw->tp_vers);
        if (ret)
                return ret;

        major = FW_HDR_FW_VER_MAJOR_GET(hw->fwrev);
        minor = FW_HDR_FW_VER_MINOR_GET(hw->fwrev);
        micro = FW_HDR_FW_VER_MICRO_GET(hw->fwrev);

        if (major != FW_VERSION_MAJOR(hw)) {    /* major mismatch - fail */
                csio_err(hw, "card FW has major version %u, driver wants %u\n",
                         major, FW_VERSION_MAJOR(hw));
                return -EINVAL;
        }

        if (minor == FW_VERSION_MINOR(hw) && micro == FW_VERSION_MICRO(hw))
                return 0;        /* perfect match */

        /* Minor/micro version mismatch */
        return -EINVAL;
}

/*
 * csio_hw_fw_dload - download firmware.
 * @hw: HW module
 * @fw_data: firmware image to write.
 * @size: image size
 *
 * Write the supplied firmware image to the card's serial flash.
 */
static int
csio_hw_fw_dload(struct csio_hw *hw, uint8_t *fw_data, uint32_t size)
{
        uint32_t csum;
        int32_t addr;
        int ret;
        uint32_t i;
        uint8_t first_page[SF_PAGE_SIZE];
        const __be32 *p = (const __be32 *)fw_data;
        struct fw_hdr *hdr = (struct fw_hdr *)fw_data;
        uint32_t sf_sec_size;

        if ((!hw->params.sf_size) || (!hw->params.sf_nsec)) {
                csio_err(hw, "Serial Flash data invalid\n");
                return -EINVAL;
        }

        if (!size) {
                csio_err(hw, "FW image has no data\n");
                return -EINVAL;
        }

        if (size & 511) {
                csio_err(hw, "FW image size not multiple of 512 bytes\n");
                return -EINVAL;
        }

        if (ntohs(hdr->len512) * 512 != size) {
                csio_err(hw, "FW image size differs from size in FW header\n");
                return -EINVAL;
        }

        if (size > FW_MAX_SIZE) {
                csio_err(hw, "FW image too large, max is %u bytes\n",
                            FW_MAX_SIZE);
                return -EINVAL;
        }

        for (csum = 0, i = 0; i < size / sizeof(csum); i++)
                csum += ntohl(p[i]);

        if (csum != 0xffffffff) {
                csio_err(hw, "corrupted firmware image, checksum %#x\n", csum);
                return -EINVAL;
        }

        sf_sec_size = hw->params.sf_size / hw->params.sf_nsec;
        i = DIV_ROUND_UP(size, sf_sec_size);        /* # of sectors spanned */

        csio_dbg(hw, "Erasing sectors... start:%d end:%d\n",
                          FW_START_SEC, FW_START_SEC + i - 1);

        ret = csio_hw_flash_erase_sectors(hw, FW_START_SEC,
                                          FW_START_SEC + i - 1);
        if (ret) {
                csio_err(hw, "Flash Erase failed\n");
                goto out;
        }

        /*
         * We write the correct version at the end so the driver can see a bad
         * version if the FW write fails.  Start by writing a copy of the
         * first page with a bad version.
         */
        memcpy(first_page, fw_data, SF_PAGE_SIZE);
        ((struct fw_hdr *)first_page)->fw_ver = htonl(0xffffffff);
        ret = csio_hw_write_flash(hw, FW_IMG_START, SF_PAGE_SIZE, first_page);
        if (ret)
                goto out;

        csio_dbg(hw, "Writing Flash .. start:%d end:%d\n",
                    FW_IMG_START, FW_IMG_START + size);

        addr = FW_IMG_START;
        for (size -= SF_PAGE_SIZE; size; size -= SF_PAGE_SIZE) {
                addr += SF_PAGE_SIZE;
                fw_data += SF_PAGE_SIZE;
                ret = csio_hw_write_flash(hw, addr, SF_PAGE_SIZE, fw_data);
                if (ret)
                        goto out;
        }

        ret = csio_hw_write_flash(hw,
                                  FW_IMG_START +
                                        offsetof(struct fw_hdr, fw_ver),
                                  sizeof(hdr->fw_ver),
                                  (const uint8_t *)&hdr->fw_ver);

out:
        if (ret)
                csio_err(hw, "firmware download failed, error %d\n", ret);
        return ret;
}

static int
csio_hw_get_flash_params(struct csio_hw *hw)
{
        int ret;
        uint32_t info = 0;

        ret = csio_hw_sf1_write(hw, 1, 1, 0, SF_RD_ID);
        if (!ret)
                ret = csio_hw_sf1_read(hw, 3, 0, 1, &info);
        csio_wr_reg32(hw, 0, SF_OP);    /* unlock SF */
        if (ret != 0)
                return ret;

        if ((info & 0xff) != 0x20)              /* not a Numonix flash */
                return -EINVAL;
        info >>= 16;                            /* log2 of size */
        if (info >= 0x14 && info < 0x18)
                hw->params.sf_nsec = 1 << (info - 16);
        else if (info == 0x18)
                hw->params.sf_nsec = 64;
        else
                return -EINVAL;
        hw->params.sf_size = 1 << info;

        return 0;
}

static void
csio_set_pcie_completion_timeout(struct csio_hw *hw, u8 range)
{
        uint16_t val;
        int pcie_cap;

        if (!csio_pci_capability(hw->pdev, PCI_CAP_ID_EXP, &pcie_cap)) {
                pci_read_config_word(hw->pdev,
                                     pcie_cap + PCI_EXP_DEVCTL2, &val);
                val &= 0xfff0;
                val |= range ;
                pci_write_config_word(hw->pdev,
                                      pcie_cap + PCI_EXP_DEVCTL2, val);
        }
}

/*****************************************************************************/
/* HW State machine assists                                                  */
/*****************************************************************************/

static int
csio_hw_dev_ready(struct csio_hw *hw)
{
        uint32_t reg;
        int cnt = 6;

        while (((reg = csio_rd_reg32(hw, PL_WHOAMI)) == 0xFFFFFFFF) &&
                                                                (--cnt != 0))
                mdelay(100);

        if ((cnt == 0) && (((int32_t)(SOURCEPF_GET(reg)) < 0) ||
                            (SOURCEPF_GET(reg) >= CSIO_MAX_PFN))) {
                csio_err(hw, "PL_WHOAMI returned 0x%x, cnt:%d\n", reg, cnt);
                return -EIO;
        }

        hw->pfn = SOURCEPF_GET(reg);

        return 0;
}

/*
 * csio_do_hello - Perform the HELLO FW Mailbox command and process response.
 * @hw: HW module
 * @state: Device state
 *
 * FW_HELLO_CMD has to be polled for completion.
 */
static int
csio_do_hello(struct csio_hw *hw, enum csio_dev_state *state)
{
        struct csio_mb  *mbp;
        int     rv = 0;
        enum csio_dev_master master;
        enum fw_retval retval;
        uint8_t mpfn;
        char state_str[16];
        int retries = FW_CMD_HELLO_RETRIES;

        memset(state_str, 0, sizeof(state_str));

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                rv = -ENOMEM;
                CSIO_INC_STATS(hw, n_err_nomem);
                goto out;
        }

        master = csio_force_master ? CSIO_MASTER_MUST : CSIO_MASTER_MAY;

retry:
        csio_mb_hello(hw, mbp, CSIO_MB_DEFAULT_TMO, hw->pfn,
                      hw->pfn, master, NULL);

        rv = csio_mb_issue(hw, mbp);
        if (rv) {
                csio_err(hw, "failed to issue HELLO cmd. ret:%d.\n", rv);
                goto out_free_mb;
        }

        csio_mb_process_hello_rsp(hw, mbp, &retval, state, &mpfn);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "HELLO cmd failed with ret: %d\n", retval);
                rv = -EINVAL;
                goto out_free_mb;
        }

        /* Firmware has designated us to be master */
        if (hw->pfn == mpfn) {
                hw->flags |= CSIO_HWF_MASTER;
        } else if (*state == CSIO_DEV_STATE_UNINIT) {
                /*
                 * If we're not the Master PF then we need to wait around for
                 * the Master PF Driver to finish setting up the adapter.
                 *
                 * Note that we also do this wait if we're a non-Master-capable
                 * PF and there is no current Master PF; a Master PF may show up
                 * momentarily and we wouldn't want to fail pointlessly.  (This
                 * can happen when an OS loads lots of different drivers rapidly
                 * at the same time). In this case, the Master PF returned by
                 * the firmware will be PCIE_FW_MASTER_MASK so the test below
                 * will work ...
                 */

                int waiting = FW_CMD_HELLO_TIMEOUT;

                /*
                 * Wait for the firmware to either indicate an error or
                 * initialized state.  If we see either of these we bail out
                 * and report the issue to the caller.  If we exhaust the
                 * "hello timeout" and we haven't exhausted our retries, try
                 * again.  Otherwise bail with a timeout error.
                 */
                for (;;) {
                        uint32_t pcie_fw;

                        spin_unlock_irq(&hw->lock);
                        msleep(50);
                        spin_lock_irq(&hw->lock);
                        waiting -= 50;

                        /*
                         * If neither Error nor Initialialized are indicated
                         * by the firmware keep waiting till we exaust our
                         * timeout ... and then retry if we haven't exhausted
                         * our retries ...
                         */
                        pcie_fw = csio_rd_reg32(hw, PCIE_FW);
                        if (!(pcie_fw & (PCIE_FW_ERR|PCIE_FW_INIT))) {
                                if (waiting <= 0) {
                                        if (retries-- > 0)
                                                goto retry;

                                        rv = -ETIMEDOUT;
                                        break;
                                }
                                continue;
                        }

                        /*
                         * We either have an Error or Initialized condition
                         * report errors preferentially.
                         */
                        if (state) {
                                if (pcie_fw & PCIE_FW_ERR) {
                                        *state = CSIO_DEV_STATE_ERR;

                                        rv = -ETIMEDOUT;
                                } else if (pcie_fw & PCIE_FW_INIT)
                                        *state = CSIO_DEV_STATE_INIT;
                        }

                        /*
                         * If we arrived before a Master PF was selected and
                         * there's not a valid Master PF, grab its identity
                         * for our caller.
                         */
                        if (mpfn == PCIE_FW_MASTER_MASK &&
                            (pcie_fw & PCIE_FW_MASTER_VLD))
                                mpfn = PCIE_FW_MASTER_GET(pcie_fw);
                        break;
                }
                hw->flags &= ~CSIO_HWF_MASTER;
        }

        switch (*state) {
        case CSIO_DEV_STATE_UNINIT:
                strcpy(state_str, "Initializing");
                break;
        case CSIO_DEV_STATE_INIT:
                strcpy(state_str, "Initialized");
                break;
        case CSIO_DEV_STATE_ERR:
                strcpy(state_str, "Error");
                break;
        default:
                strcpy(state_str, "Unknown");
                break;
        }

        if (hw->pfn == mpfn)
                csio_info(hw, "PF: %d, Coming up as MASTER, HW state: %s\n",
                        hw->pfn, state_str);
        else
                csio_info(hw,
                    "PF: %d, Coming up as SLAVE, Master PF: %d, HW state: %s\n",
                    hw->pfn, mpfn, state_str);

out_free_mb:
        mempool_free(mbp, hw->mb_mempool);
out:
        return rv;
}

/*
 * csio_do_bye - Perform the BYE FW Mailbox command and process response.
 * @hw: HW module
 *
 */
static int
csio_do_bye(struct csio_hw *hw)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        csio_mb_bye(hw, mbp, CSIO_MB_DEFAULT_TMO, NULL);

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of BYE command failed\n");
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        retval = csio_mb_fw_retval(mbp);
        if (retval != FW_SUCCESS) {
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        mempool_free(mbp, hw->mb_mempool);

        return 0;
}

/*
 * csio_do_reset- Perform the device reset.
 * @hw: HW module
 * @fw_rst: FW reset
 *
 * If fw_rst is set, issues FW reset mbox cmd otherwise
 * does PIO reset.
 * Performs reset of the function.
 */
static int
csio_do_reset(struct csio_hw *hw, bool fw_rst)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;

        if (!fw_rst) {
                /* PIO reset */
                csio_wr_reg32(hw, PIORSTMODE | PIORST, PL_RST);
                mdelay(2000);
                return 0;
        }

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        csio_mb_reset(hw, mbp, CSIO_MB_DEFAULT_TMO,
                      PIORSTMODE | PIORST, 0, NULL);

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of RESET command failed.n");
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        retval = csio_mb_fw_retval(mbp);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "RESET cmd failed with ret:0x%x.\n", retval);
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        mempool_free(mbp, hw->mb_mempool);

        return 0;
}

static int
csio_hw_validate_caps(struct csio_hw *hw, struct csio_mb *mbp)
{
        struct fw_caps_config_cmd *rsp = (struct fw_caps_config_cmd *)mbp->mb;
        uint16_t caps;

        caps = ntohs(rsp->fcoecaps);

        if (!(caps & FW_CAPS_CONFIG_FCOE_INITIATOR)) {
                csio_err(hw, "No FCoE Initiator capability in the firmware.\n");
                return -EINVAL;
        }

        if (!(caps & FW_CAPS_CONFIG_FCOE_CTRL_OFLD)) {
                csio_err(hw, "No FCoE Control Offload capability\n");
                return -EINVAL;
        }

        return 0;
}

/*
 *      csio_hw_fw_halt - issue a reset/halt to FW and put uP into RESET
 *      @hw: the HW module
 *      @mbox: mailbox to use for the FW RESET command (if desired)
 *      @force: force uP into RESET even if FW RESET command fails
 *
 *      Issues a RESET command to firmware (if desired) with a HALT indication
 *      and then puts the microprocessor into RESET state.  The RESET command
 *      will only be issued if a legitimate mailbox is provided (mbox <=
 *      PCIE_FW_MASTER_MASK).
 *
 *      This is generally used in order for the host to safely manipulate the
 *      adapter without fear of conflicting with whatever the firmware might
 *      be doing.  The only way out of this state is to RESTART the firmware
 *      ...
 */
static int
csio_hw_fw_halt(struct csio_hw *hw, uint32_t mbox, int32_t force)
{
        enum fw_retval retval = 0;

        /*
         * If a legitimate mailbox is provided, issue a RESET command
         * with a HALT indication.
         */
        if (mbox <= PCIE_FW_MASTER_MASK) {
                struct csio_mb  *mbp;

                mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
                if (!mbp) {
                        CSIO_INC_STATS(hw, n_err_nomem);
                        return -ENOMEM;
                }

                csio_mb_reset(hw, mbp, CSIO_MB_DEFAULT_TMO,
                              PIORSTMODE | PIORST, FW_RESET_CMD_HALT(1),
                              NULL);

                if (csio_mb_issue(hw, mbp)) {
                        csio_err(hw, "Issue of RESET command failed!\n");
                        mempool_free(mbp, hw->mb_mempool);
                        return -EINVAL;
                }

                retval = csio_mb_fw_retval(mbp);
                mempool_free(mbp, hw->mb_mempool);
        }

        /*
         * Normally we won't complete the operation if the firmware RESET
         * command fails but if our caller insists we'll go ahead and put the
         * uP into RESET.  This can be useful if the firmware is hung or even
         * missing ...  We'll have to take the risk of putting the uP into
         * RESET without the cooperation of firmware in that case.
         *
         * We also force the firmware's HALT flag to be on in case we bypassed
         * the firmware RESET command above or we're dealing with old firmware
         * which doesn't have the HALT capability.  This will serve as a flag
         * for the incoming firmware to know that it's coming out of a HALT
         * rather than a RESET ... if it's new enough to understand that ...
         */
        if (retval == 0 || force) {
                csio_set_reg_field(hw, CIM_BOOT_CFG, UPCRST, UPCRST);
                csio_set_reg_field(hw, PCIE_FW, PCIE_FW_HALT, PCIE_FW_HALT);
        }

        /*
         * And we always return the result of the firmware RESET command
         * even when we force the uP into RESET ...
         */
        return retval ? -EINVAL : 0;
}

/*
 *      csio_hw_fw_restart - restart the firmware by taking the uP out of RESET
 *      @hw: the HW module
 *      @reset: if we want to do a RESET to restart things
 *
 *      Restart firmware previously halted by csio_hw_fw_halt().  On successful
 *      return the previous PF Master remains as the new PF Master and there
 *      is no need to issue a new HELLO command, etc.
 *
 *      We do this in two ways:
 *
 *       1. If we're dealing with newer firmware we'll simply want to take
 *          the chip's microprocessor out of RESET.  This will cause the
 *          firmware to start up from its start vector.  And then we'll loop
 *          until the firmware indicates it's started again (PCIE_FW.HALT
 *          reset to 0) or we timeout.
 *
 *       2. If we're dealing with older firmware then we'll need to RESET
 *          the chip since older firmware won't recognize the PCIE_FW.HALT
 *          flag and automatically RESET itself on startup.
 */
static int
csio_hw_fw_restart(struct csio_hw *hw, uint32_t mbox, int32_t reset)
{
        if (reset) {
                /*
                 * Since we're directing the RESET instead of the firmware
                 * doing it automatically, we need to clear the PCIE_FW.HALT
                 * bit.
                 */
                csio_set_reg_field(hw, PCIE_FW, PCIE_FW_HALT, 0);

                /*
                 * If we've been given a valid mailbox, first try to get the
                 * firmware to do the RESET.  If that works, great and we can
                 * return success.  Otherwise, if we haven't been given a
                 * valid mailbox or the RESET command failed, fall back to
                 * hitting the chip with a hammer.
                 */
                if (mbox <= PCIE_FW_MASTER_MASK) {
                        csio_set_reg_field(hw, CIM_BOOT_CFG, UPCRST, 0);
                        msleep(100);
                        if (csio_do_reset(hw, true) == 0)
                                return 0;
                }

                csio_wr_reg32(hw, PIORSTMODE | PIORST, PL_RST);
                msleep(2000);
        } else {
                int ms;

                csio_set_reg_field(hw, CIM_BOOT_CFG, UPCRST, 0);
                for (ms = 0; ms < FW_CMD_MAX_TIMEOUT; ) {
                        if (!(csio_rd_reg32(hw, PCIE_FW) & PCIE_FW_HALT))
                                return 0;
                        msleep(100);
                        ms += 100;
                }
                return -ETIMEDOUT;
        }
        return 0;
}

/*
 *      csio_hw_fw_upgrade - perform all of the steps necessary to upgrade FW
 *      @hw: the HW module
 *      @mbox: mailbox to use for the FW RESET command (if desired)
 *      @fw_data: the firmware image to write
 *      @size: image size
 *      @force: force upgrade even if firmware doesn't cooperate
 *
 *      Perform all of the steps necessary for upgrading an adapter's
 *      firmware image.  Normally this requires the cooperation of the
 *      existing firmware in order to halt all existing activities
 *      but if an invalid mailbox token is passed in we skip that step
 *      (though we'll still put the adapter microprocessor into RESET in
 *      that case).
 *
 *      On successful return the new firmware will have been loaded and
 *      the adapter will have been fully RESET losing all previous setup
 *      state.  On unsuccessful return the adapter may be completely hosed ...
 *      positive errno indicates that the adapter is ~probably~ intact, a
 *      negative errno indicates that things are looking bad ...
 */
static int
csio_hw_fw_upgrade(struct csio_hw *hw, uint32_t mbox,
                  const u8 *fw_data, uint32_t size, int32_t force)
{
        const struct fw_hdr *fw_hdr = (const struct fw_hdr *)fw_data;
        int reset, ret;

        ret = csio_hw_fw_halt(hw, mbox, force);
        if (ret != 0 && !force)
                return ret;

        ret = csio_hw_fw_dload(hw, (uint8_t *) fw_data, size);
        if (ret != 0)
                return ret;

        /*
         * Older versions of the firmware don't understand the new
         * PCIE_FW.HALT flag and so won't know to perform a RESET when they
         * restart.  So for newly loaded older firmware we'll have to do the
         * RESET for it so it starts up on a clean slate.  We can tell if
         * the newly loaded firmware will handle this right by checking
         * its header flags to see if it advertises the capability.
         */
        reset = ((ntohl(fw_hdr->flags) & FW_HDR_FLAGS_RESET_HALT) == 0);
        return csio_hw_fw_restart(hw, mbox, reset);
}


/*
 *      csio_hw_fw_config_file - setup an adapter via a Configuration File
 *      @hw: the HW module
 *      @mbox: mailbox to use for the FW command
 *      @mtype: the memory type where the Configuration File is located
 *      @maddr: the memory address where the Configuration File is located
 *      @finiver: return value for CF [fini] version
 *      @finicsum: return value for CF [fini] checksum
 *      @cfcsum: return value for CF computed checksum
 *
 *      Issue a command to get the firmware to process the Configuration
 *      File located at the specified mtype/maddress.  If the Configuration
 *      File is processed successfully and return value pointers are
 *      provided, the Configuration File "[fini] section version and
 *      checksum values will be returned along with the computed checksum.
 *      It's up to the caller to decide how it wants to respond to the
 *      checksums not matching but it recommended that a prominant warning
 *      be emitted in order to help people rapidly identify changed or
 *      corrupted Configuration Files.
 *
 *      Also note that it's possible to modify things like "niccaps",
 *      "toecaps",etc. between processing the Configuration File and telling
 *      the firmware to use the new configuration.  Callers which want to
 *      do this will need to "hand-roll" their own CAPS_CONFIGS commands for
 *      Configuration Files if they want to do this.
 */
static int
csio_hw_fw_config_file(struct csio_hw *hw,
                      unsigned int mtype, unsigned int maddr,
                      uint32_t *finiver, uint32_t *finicsum, uint32_t *cfcsum)
{
        struct csio_mb  *mbp;
        struct fw_caps_config_cmd *caps_cmd;
        int rv = -EINVAL;
        enum fw_retval ret;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }
        /*
         * Tell the firmware to process the indicated Configuration File.
         * If there are no errors and the caller has provided return value
         * pointers for the [fini] section version, checksum and computed
         * checksum, pass those back to the caller.
         */
        caps_cmd = (struct fw_caps_config_cmd *)(mbp->mb);
        CSIO_INIT_MBP(mbp, caps_cmd, CSIO_MB_DEFAULT_TMO, hw, NULL, 1);
        caps_cmd->op_to_write =
                htonl(FW_CMD_OP(FW_CAPS_CONFIG_CMD) |
                      FW_CMD_REQUEST |
                      FW_CMD_READ);
        caps_cmd->cfvalid_to_len16 =
                htonl(FW_CAPS_CONFIG_CMD_CFVALID |
                      FW_CAPS_CONFIG_CMD_MEMTYPE_CF(mtype) |
                      FW_CAPS_CONFIG_CMD_MEMADDR64K_CF(maddr >> 16) |
                      FW_LEN16(*caps_cmd));

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_CAPS_CONFIG_CMD failed!\n");
                goto out;
        }

        ret = csio_mb_fw_retval(mbp);
        if (ret != FW_SUCCESS) {
                csio_dbg(hw, "FW_CAPS_CONFIG_CMD returned %d!\n", rv);
                goto out;
        }

        if (finiver)
                *finiver = ntohl(caps_cmd->finiver);
        if (finicsum)
                *finicsum = ntohl(caps_cmd->finicsum);
        if (cfcsum)
                *cfcsum = ntohl(caps_cmd->cfcsum);

        /* Validate device capabilities */
        if (csio_hw_validate_caps(hw, mbp)) {
                rv = -ENOENT;
                goto out;
        }

        /*
         * And now tell the firmware to use the configuration we just loaded.
         */
        caps_cmd->op_to_write =
                htonl(FW_CMD_OP(FW_CAPS_CONFIG_CMD) |
                      FW_CMD_REQUEST |
                      FW_CMD_WRITE);
        caps_cmd->cfvalid_to_len16 = htonl(FW_LEN16(*caps_cmd));

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_CAPS_CONFIG_CMD failed!\n");
                goto out;
        }

        ret = csio_mb_fw_retval(mbp);
        if (ret != FW_SUCCESS) {
                csio_dbg(hw, "FW_CAPS_CONFIG_CMD returned %d!\n", rv);
                goto out;
        }

        rv = 0;
out:
        mempool_free(mbp, hw->mb_mempool);
        return rv;
}

/*
 * csio_get_device_params - Get device parameters.
 * @hw: HW module
 *
 */
static int
csio_get_device_params(struct csio_hw *hw)
{
        struct csio_wrm *wrm    = csio_hw_to_wrm(hw);
        struct csio_mb  *mbp;
        enum fw_retval retval;
        u32 param[6];
        int i, j = 0;

        /* Initialize portids to -1 */
        for (i = 0; i < CSIO_MAX_PPORTS; i++)
                hw->pport[i].portid = -1;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        /* Get port vec information. */
        param[0] = FW_PARAM_DEV(PORTVEC);

        /* Get Core clock. */
        param[1] = FW_PARAM_DEV(CCLK);

        /* Get EQ id start and end. */
        param[2] = FW_PARAM_PFVF(EQ_START);
        param[3] = FW_PARAM_PFVF(EQ_END);

        /* Get IQ id start and end. */
        param[4] = FW_PARAM_PFVF(IQFLINT_START);
        param[5] = FW_PARAM_PFVF(IQFLINT_END);

        csio_mb_params(hw, mbp, CSIO_MB_DEFAULT_TMO, hw->pfn, 0,
                       ARRAY_SIZE(param), param, NULL, false, NULL);
        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_PARAMS_CMD(read) failed!\n");
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        csio_mb_process_read_params_rsp(hw, mbp, &retval,
                        ARRAY_SIZE(param), param);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "FW_PARAMS_CMD(read) failed with ret:0x%x!\n",
                                retval);
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        /* cache the information. */
        hw->port_vec = param[0];
        hw->vpd.cclk = param[1];
        wrm->fw_eq_start = param[2];
        wrm->fw_iq_start = param[4];

        /* Using FW configured max iqs & eqs */
        if ((hw->flags & CSIO_HWF_USING_SOFT_PARAMS) ||
                !csio_is_hw_master(hw)) {
                hw->cfg_niq = param[5] - param[4] + 1;
                hw->cfg_neq = param[3] - param[2] + 1;
                csio_dbg(hw, "Using fwconfig max niqs %d neqs %d\n",
                        hw->cfg_niq, hw->cfg_neq);
        }

        hw->port_vec &= csio_port_mask;

        hw->num_pports  = hweight32(hw->port_vec);

        csio_dbg(hw, "Port vector: 0x%x, #ports: %d\n",
                    hw->port_vec, hw->num_pports);

        for (i = 0; i < hw->num_pports; i++) {
                while ((hw->port_vec & (1 << j)) == 0)
                        j++;
                hw->pport[i].portid = j++;
                csio_dbg(hw, "Found Port:%d\n", hw->pport[i].portid);
        }
        mempool_free(mbp, hw->mb_mempool);

        return 0;
}


/*
 * csio_config_device_caps - Get and set device capabilities.
 * @hw: HW module
 *
 */
static int
csio_config_device_caps(struct csio_hw *hw)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;
        int rv = -EINVAL;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        /* Get device capabilities */
        csio_mb_caps_config(hw, mbp, CSIO_MB_DEFAULT_TMO, 0, 0, 0, 0, NULL);

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_CAPS_CONFIG_CMD(r) failed!\n");
                goto out;
        }

        retval = csio_mb_fw_retval(mbp);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "FW_CAPS_CONFIG_CMD(r) returned %d!\n", retval);
                goto out;
        }

        /* Validate device capabilities */
        if (csio_hw_validate_caps(hw, mbp))
                goto out;

        /* Don't config device capabilities if already configured */
        if (hw->fw_state == CSIO_DEV_STATE_INIT) {
                rv = 0;
                goto out;
        }

        /* Write back desired device capabilities */
        csio_mb_caps_config(hw, mbp, CSIO_MB_DEFAULT_TMO, true, true,
                            false, true, NULL);

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_CAPS_CONFIG_CMD(w) failed!\n");
                goto out;
        }

        retval = csio_mb_fw_retval(mbp);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "FW_CAPS_CONFIG_CMD(w) returned %d!\n", retval);
                goto out;
        }

        rv = 0;
out:
        mempool_free(mbp, hw->mb_mempool);
        return rv;
}

/*
 * csio_enable_ports - Bring up all available ports.
 * @hw: HW module.
 *
 */
static int
csio_enable_ports(struct csio_hw *hw)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;
        uint8_t portid;
        int i;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        for (i = 0; i < hw->num_pports; i++) {
                portid = hw->pport[i].portid;

                /* Read PORT information */
                csio_mb_port(hw, mbp, CSIO_MB_DEFAULT_TMO, portid,
                             false, 0, 0, NULL);

                if (csio_mb_issue(hw, mbp)) {
                        csio_err(hw, "failed to issue FW_PORT_CMD(r) port:%d\n",
                                 portid);
                        mempool_free(mbp, hw->mb_mempool);
                        return -EINVAL;
                }

                csio_mb_process_read_port_rsp(hw, mbp, &retval,
                                              &hw->pport[i].pcap);
                if (retval != FW_SUCCESS) {
                        csio_err(hw, "FW_PORT_CMD(r) port:%d failed: 0x%x\n",
                                 portid, retval);
                        mempool_free(mbp, hw->mb_mempool);
                        return -EINVAL;
                }

                /* Write back PORT information */
                csio_mb_port(hw, mbp, CSIO_MB_DEFAULT_TMO, portid, true,
                             (PAUSE_RX | PAUSE_TX), hw->pport[i].pcap, NULL);

                if (csio_mb_issue(hw, mbp)) {
                        csio_err(hw, "failed to issue FW_PORT_CMD(w) port:%d\n",
                                 portid);
                        mempool_free(mbp, hw->mb_mempool);
                        return -EINVAL;
                }

                retval = csio_mb_fw_retval(mbp);
                if (retval != FW_SUCCESS) {
                        csio_err(hw, "FW_PORT_CMD(w) port:%d failed :0x%x\n",
                                 portid, retval);
                        mempool_free(mbp, hw->mb_mempool);
                        return -EINVAL;
                }

        } /* For all ports */

        mempool_free(mbp, hw->mb_mempool);

        return 0;
}

/*
 * csio_get_fcoe_resinfo - Read fcoe fw resource info.
 * @hw: HW module
 * Issued with lock held.
 */
static int
csio_get_fcoe_resinfo(struct csio_hw *hw)
{
        struct csio_fcoe_res_info *res_info = &hw->fres_info;
        struct fw_fcoe_res_info_cmd *rsp;
        struct csio_mb  *mbp;
        enum fw_retval retval;

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        /* Get FCoE FW resource information */
        csio_fcoe_read_res_info_init_mb(hw, mbp, CSIO_MB_DEFAULT_TMO, NULL);

        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "failed to issue FW_FCOE_RES_INFO_CMD\n");
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        rsp = (struct fw_fcoe_res_info_cmd *)(mbp->mb);
        retval = FW_CMD_RETVAL_GET(ntohl(rsp->retval_len16));
        if (retval != FW_SUCCESS) {
                csio_err(hw, "FW_FCOE_RES_INFO_CMD failed with ret x%x\n",
                         retval);
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        res_info->e_d_tov = ntohs(rsp->e_d_tov);
        res_info->r_a_tov_seq = ntohs(rsp->r_a_tov_seq);
        res_info->r_a_tov_els = ntohs(rsp->r_a_tov_els);
        res_info->r_r_tov = ntohs(rsp->r_r_tov);
        res_info->max_xchgs = ntohl(rsp->max_xchgs);
        res_info->max_ssns = ntohl(rsp->max_ssns);
        res_info->used_xchgs = ntohl(rsp->used_xchgs);
        res_info->used_ssns = ntohl(rsp->used_ssns);
        res_info->max_fcfs = ntohl(rsp->max_fcfs);
        res_info->max_vnps = ntohl(rsp->max_vnps);
        res_info->used_fcfs = ntohl(rsp->used_fcfs);
        res_info->used_vnps = ntohl(rsp->used_vnps);

        csio_dbg(hw, "max ssns:%d max xchgs:%d\n", res_info->max_ssns,
                                                  res_info->max_xchgs);
        mempool_free(mbp, hw->mb_mempool);

        return 0;
}

static int
csio_hw_check_fwconfig(struct csio_hw *hw, u32 *param)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;
        u32 _param[1];

        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                return -ENOMEM;
        }

        /*
         * Find out whether we're dealing with a version of
         * the firmware which has configuration file support.
         */
        _param[0] = (FW_PARAMS_MNEM(FW_PARAMS_MNEM_DEV) |
                     FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DEV_CF));

        csio_mb_params(hw, mbp, CSIO_MB_DEFAULT_TMO, hw->pfn, 0,
                       ARRAY_SIZE(_param), _param, NULL, false, NULL);
        if (csio_mb_issue(hw, mbp)) {
                csio_err(hw, "Issue of FW_PARAMS_CMD(read) failed!\n");
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        csio_mb_process_read_params_rsp(hw, mbp, &retval,
                        ARRAY_SIZE(_param), _param);
        if (retval != FW_SUCCESS) {
                csio_err(hw, "FW_PARAMS_CMD(read) failed with ret:0x%x!\n",
                                retval);
                mempool_free(mbp, hw->mb_mempool);
                return -EINVAL;
        }

        mempool_free(mbp, hw->mb_mempool);
        *param = _param[0];

        return 0;
}

static int
csio_hw_flash_config(struct csio_hw *hw, u32 *fw_cfg_param, char *path)
{
        int ret = 0;
        const struct firmware *cf;
        struct pci_dev *pci_dev = hw->pdev;
        struct device *dev = &pci_dev->dev;
        unsigned int mtype = 0, maddr = 0;
        uint32_t *cfg_data;
        int value_to_add = 0;

        if (request_firmware(&cf, CSIO_CF_FNAME(hw), dev) < 0) {
                csio_err(hw, "could not find config file %s, err: %d\n",
                         CSIO_CF_FNAME(hw), ret);
                return -ENOENT;
        }

        if (cf->size%4 != 0)
                value_to_add = 4 - (cf->size % 4);

        cfg_data = kzalloc(cf->size+value_to_add, GFP_KERNEL);
        if (cfg_data == NULL) {
                ret = -ENOMEM;
                goto leave;
        }

        memcpy((void *)cfg_data, (const void *)cf->data, cf->size);
        if (csio_hw_check_fwconfig(hw, fw_cfg_param) != 0) {
                ret = -EINVAL;
                goto leave;
        }

        mtype = FW_PARAMS_PARAM_Y_GET(*fw_cfg_param);
        maddr = FW_PARAMS_PARAM_Z_GET(*fw_cfg_param) << 16;

        ret = csio_memory_write(hw, mtype, maddr,
                                cf->size + value_to_add, cfg_data);

        if ((ret == 0) && (value_to_add != 0)) {
                union {
                        u32 word;
                        char buf[4];
                } last;
                size_t size = cf->size & ~0x3;
                int i;

                last.word = cfg_data[size >> 2];
                for (i = value_to_add; i < 4; i++)
                        last.buf[i] = 0;
                ret = csio_memory_write(hw, mtype, maddr + size, 4, &last.word);
        }
        if (ret == 0) {
                csio_info(hw, "config file upgraded to %s\n",
                          CSIO_CF_FNAME(hw));
                snprintf(path, 64, "%s%s", "/lib/firmware/", CSIO_CF_FNAME(hw));
        }

leave:
        kfree(cfg_data);
        release_firmware(cf);
        return ret;
}

/*
 * HW initialization: contact FW, obtain config, perform basic init.
 *
 * If the firmware we're dealing with has Configuration File support, then
 * we use that to perform all configuration -- either using the configuration
 * file stored in flash on the adapter or using a filesystem-local file
 * if available.
 *
 * If we don't have configuration file support in the firmware, then we'll
 * have to set things up the old fashioned way with hard-coded register
 * writes and firmware commands ...
 */

/*
 * Attempt to initialize the HW via a Firmware Configuration File.
 */
static int
csio_hw_use_fwconfig(struct csio_hw *hw, int reset, u32 *fw_cfg_param)
{
        unsigned int mtype, maddr;
        int rv;
        uint32_t finiver = 0, finicsum = 0, cfcsum = 0;
        int using_flash;
        char path[64];

        /*
         * Reset device if necessary
         */
        if (reset) {
                rv = csio_do_reset(hw, true);
                if (rv != 0)
                        goto bye;
        }

        /*
         * If we have a configuration file in host ,
         * then use that.  Otherwise, use the configuration file stored
         * in the HW flash ...
         */
        spin_unlock_irq(&hw->lock);
        rv = csio_hw_flash_config(hw, fw_cfg_param, path);
        spin_lock_irq(&hw->lock);
        if (rv != 0) {
                if (rv == -ENOENT) {
                        /*
                         * config file was not found. Use default
                         * config file from flash.
                         */
                        mtype = FW_MEMTYPE_CF_FLASH;
                        maddr = hw->chip_ops->chip_flash_cfg_addr(hw);
                        using_flash = 1;
                } else {
                        /*
                         * we revert back to the hardwired config if
                         * flashing failed.
                         */
                        goto bye;
                }
        } else {
                mtype = FW_PARAMS_PARAM_Y_GET(*fw_cfg_param);
                maddr = FW_PARAMS_PARAM_Z_GET(*fw_cfg_param) << 16;
                using_flash = 0;
        }

        hw->cfg_store = (uint8_t)mtype;

        /*
         * Issue a Capability Configuration command to the firmware to get it
         * to parse the Configuration File.
         */
        rv = csio_hw_fw_config_file(hw, mtype, maddr, &finiver,
                &finicsum, &cfcsum);
        if (rv != 0)
                goto bye;

        hw->cfg_finiver         = finiver;
        hw->cfg_finicsum        = finicsum;
        hw->cfg_cfcsum          = cfcsum;
        hw->cfg_csum_status     = true;

        if (finicsum != cfcsum) {
                csio_warn(hw,
                      "Config File checksum mismatch: csum=%#x, computed=%#x\n",
                      finicsum, cfcsum);

                hw->cfg_csum_status = false;
        }

        /*
         * Note that we're operating with parameters
         * not supplied by the driver, rather than from hard-wired
         * initialization constants buried in the driver.
         */
        hw->flags |= CSIO_HWF_USING_SOFT_PARAMS;

        /* device parameters */
        rv = csio_get_device_params(hw);
        if (rv != 0)
                goto bye;

        /* Configure SGE */
        csio_wr_sge_init(hw);

        /*
         * And finally tell the firmware to initialize itself using the
         * parameters from the Configuration File.
         */
        /* Post event to notify completion of configuration */
        csio_post_event(&hw->sm, CSIO_HWE_INIT);

        csio_info(hw,
         "Firmware Configuration File %s, version %#x, computed checksum %#x\n",
                  (using_flash ? "in device FLASH" : path), finiver, cfcsum);

        return 0;

        /*
         * Something bad happened.  Return the error ...
         */
bye:
        hw->flags &= ~CSIO_HWF_USING_SOFT_PARAMS;
        csio_dbg(hw, "Configuration file error %d\n", rv);
        return rv;
}

/*
 * Attempt to initialize the adapter via hard-coded, driver supplied
 * parameters ...
 */
static int
csio_hw_no_fwconfig(struct csio_hw *hw, int reset)
{
        int             rv;
        /*
         * Reset device if necessary
         */
        if (reset) {
                rv = csio_do_reset(hw, true);
                if (rv != 0)
                        goto out;
        }

        /* Get and set device capabilities */
        rv = csio_config_device_caps(hw);
        if (rv != 0)
                goto out;

        /* device parameters */
        rv = csio_get_device_params(hw);
        if (rv != 0)
                goto out;

        /* Configure SGE */
        csio_wr_sge_init(hw);

        /* Post event to notify completion of configuration */
        csio_post_event(&hw->sm, CSIO_HWE_INIT);

out:
        return rv;
}

/*
 * Returns -EINVAL if attempts to flash the firmware failed
 * else returns 0,
 * if flashing was not attempted because the card had the
 * latest firmware ECANCELED is returned
 */
static int
csio_hw_flash_fw(struct csio_hw *hw)

{
        int ret = -ECANCELED;
        const struct firmware *fw;
        const struct fw_hdr *hdr;
        u32 fw_ver;
        struct pci_dev *pci_dev = hw->pdev;
        struct device *dev = &pci_dev->dev ;

        if (request_firmware(&fw, CSIO_FW_FNAME(hw), dev) < 0) {
                csio_err(hw, "could not find firmware image %s, err: %d\n",
                         CSIO_FW_FNAME(hw), ret);
                return -EINVAL;
        }

        hdr = (const struct fw_hdr *)fw->data;
        fw_ver = ntohl(hdr->fw_ver);
        if (FW_HDR_FW_VER_MAJOR_GET(fw_ver) != FW_VERSION_MAJOR(hw))
                return -EINVAL;      /* wrong major version, won't do */

        /*
         * If the flash FW is unusable or we found something newer, load it.
         */
        if (FW_HDR_FW_VER_MAJOR_GET(hw->fwrev) != FW_VERSION_MAJOR(hw) ||
            fw_ver > hw->fwrev) {
                ret = csio_hw_fw_upgrade(hw, hw->pfn, fw->data, fw->size,
                                    /*force=*/false);
                if (!ret)
                        csio_info(hw,
                                  "firmware upgraded to version %pI4 from %s\n",
                                  &hdr->fw_ver, CSIO_FW_FNAME(hw));
                else
                        csio_err(hw, "firmware upgrade failed! err=%d\n", ret);
        } else
                ret = -EINVAL;

        release_firmware(fw);

        return ret;
}


/*
 * csio_hw_configure - Configure HW
 * @hw - HW module
 *
 */
static void
csio_hw_configure(struct csio_hw *hw)
{
        int reset = 1;
        int rv;
        u32 param[1];

        rv = csio_hw_dev_ready(hw);
        if (rv != 0) {
                CSIO_INC_STATS(hw, n_err_fatal);
                csio_post_event(&hw->sm, CSIO_HWE_FATAL);
                goto out;
        }

        /* HW version */
        hw->chip_ver = (char)csio_rd_reg32(hw, PL_REV);

        /* Needed for FW download */
        rv = csio_hw_get_flash_params(hw);
        if (rv != 0) {
                csio_err(hw, "Failed to get serial flash params rv:%d\n", rv);
                csio_post_event(&hw->sm, CSIO_HWE_FATAL);
                goto out;
        }

        /* Set pci completion timeout value to 4 seconds. */
        csio_set_pcie_completion_timeout(hw, 0xd);

        hw->chip_ops->chip_set_mem_win(hw, MEMWIN_CSIOSTOR);

        rv = csio_hw_get_fw_version(hw, &hw->fwrev);
        if (rv != 0)
                goto out;

        csio_hw_print_fw_version(hw, "Firmware revision");

        rv = csio_do_hello(hw, &hw->fw_state);
        if (rv != 0) {
                CSIO_INC_STATS(hw, n_err_fatal);
                csio_post_event(&hw->sm, CSIO_HWE_FATAL);
                goto out;
        }

        /* Read vpd */
        rv = csio_hw_get_vpd_params(hw, &hw->vpd);
        if (rv != 0)
                goto out;

        if (csio_is_hw_master(hw) && hw->fw_state != CSIO_DEV_STATE_INIT) {
                rv = csio_hw_check_fw_version(hw);
                if (rv == -EINVAL) {

                        /* Do firmware update */
                        spin_unlock_irq(&hw->lock);
                        rv = csio_hw_flash_fw(hw);
                        spin_lock_irq(&hw->lock);

                        if (rv == 0) {
                                reset = 0;
                                /*
                                 * Note that the chip was reset as part of the
                                 * firmware upgrade so we don't reset it again
                                 * below and grab the new firmware version.
                                 */
                                rv = csio_hw_check_fw_version(hw);
                        }
                }
                /*
                 * If the firmware doesn't support Configuration
                 * Files, use the old Driver-based, hard-wired
                 * initialization.  Otherwise, try using the
                 * Configuration File support and fall back to the
                 * Driver-based initialization if there's no
                 * Configuration File found.
                 */
                if (csio_hw_check_fwconfig(hw, param) == 0) {
                        rv = csio_hw_use_fwconfig(hw, reset, param);
                        if (rv == -ENOENT)
                                goto out;
                        if (rv != 0) {
                                csio_info(hw,
                                    "No Configuration File present "
                                    "on adapter.  Using hard-wired "
                                    "configuration parameters.\n");
                                rv = csio_hw_no_fwconfig(hw, reset);
                        }
                } else {
                        rv = csio_hw_no_fwconfig(hw, reset);
                }

                if (rv != 0)
                        goto out;

        } else {
                if (hw->fw_state == CSIO_DEV_STATE_INIT) {

                        hw->flags |= CSIO_HWF_USING_SOFT_PARAMS;

                        /* device parameters */
                        rv = csio_get_device_params(hw);
                        if (rv != 0)
                                goto out;

                        /* Get device capabilities */
                        rv = csio_config_device_caps(hw);
                        if (rv != 0)
                                goto out;

                        /* Configure SGE */
                        csio_wr_sge_init(hw);

                        /* Post event to notify completion of configuration */
                        csio_post_event(&hw->sm, CSIO_HWE_INIT);
                        goto out;
                }
        } /* if not master */

out:
        return;
}

/*
 * csio_hw_initialize - Initialize HW
 * @hw - HW module
 *
 */
static void
csio_hw_initialize(struct csio_hw *hw)
{
        struct csio_mb  *mbp;
        enum fw_retval retval;
        int rv;
        int i;

        if (csio_is_hw_master(hw) && hw->fw_state != CSIO_DEV_STATE_INIT) {
                mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
                if (!mbp)
                        goto out;

                csio_mb_initialize(hw, mbp, CSIO_MB_DEFAULT_TMO, NULL);

                if (csio_mb_issue(hw, mbp)) {
                        csio_err(hw, "Issue of FW_INITIALIZE_CMD failed!\n");
                        goto free_and_out;
                }

                retval = csio_mb_fw_retval(mbp);
                if (retval != FW_SUCCESS) {
                        csio_err(hw, "FW_INITIALIZE_CMD returned 0x%x!\n",
                                 retval);
                        goto free_and_out;
                }

                mempool_free(mbp, hw->mb_mempool);
        }

        rv = csio_get_fcoe_resinfo(hw);
        if (rv != 0) {
                csio_err(hw, "Failed to read fcoe resource info: %d\n", rv);
                goto out;
        }

        spin_unlock_irq(&hw->lock);
        rv = csio_config_queues(hw);
        spin_lock_irq(&hw->lock);

        if (rv != 0) {
                csio_err(hw, "Config of queues failed!: %d\n", rv);
                goto out;
        }

        for (i = 0; i < hw->num_pports; i++)
                hw->pport[i].mod_type = FW_PORT_MOD_TYPE_NA;

        if (csio_is_hw_master(hw) && hw->fw_state != CSIO_DEV_STATE_INIT) {
                rv = csio_enable_ports(hw);
                if (rv != 0) {
                        csio_err(hw, "Failed to enable ports: %d\n", rv);
                        goto out;
                }
        }

        csio_post_event(&hw->sm, CSIO_HWE_INIT_DONE);
        return;

free_and_out:
        mempool_free(mbp, hw->mb_mempool);
out:
        return;
}

#define PF_INTR_MASK (PFSW | PFCIM)

/*
 * csio_hw_intr_enable - Enable HW interrupts
 * @hw: Pointer to HW module.
 *
 * Enable interrupts in HW registers.
 */
static void
csio_hw_intr_enable(struct csio_hw *hw)
{
        uint16_t vec = (uint16_t)csio_get_mb_intr_idx(csio_hw_to_mbm(hw));
        uint32_t pf = SOURCEPF_GET(csio_rd_reg32(hw, PL_WHOAMI));
        uint32_t pl = csio_rd_reg32(hw, PL_INT_ENABLE);

        /*
         * Set aivec for MSI/MSIX. PCIE_PF_CFG.INTXType is set up
         * by FW, so do nothing for INTX.
         */
        if (hw->intr_mode == CSIO_IM_MSIX)
                csio_set_reg_field(hw, MYPF_REG(PCIE_PF_CFG),
                                   AIVEC(AIVEC_MASK), vec);
        else if (hw->intr_mode == CSIO_IM_MSI)
                csio_set_reg_field(hw, MYPF_REG(PCIE_PF_CFG),
                                   AIVEC(AIVEC_MASK), 0);

        csio_wr_reg32(hw, PF_INTR_MASK, MYPF_REG(PL_PF_INT_ENABLE));

        /* Turn on MB interrupts - this will internally flush PIO as well */
        csio_mb_intr_enable(hw);

        /* These are common registers - only a master can modify them */
        if (csio_is_hw_master(hw)) {
                /*
                 * Disable the Serial FLASH interrupt, if enabled!
                 */
                pl &= (~SF);
                csio_wr_reg32(hw, pl, PL_INT_ENABLE);

                csio_wr_reg32(hw, ERR_CPL_EXCEED_IQE_SIZE |
                              EGRESS_SIZE_ERR | ERR_INVALID_CIDX_INC |
                              ERR_CPL_OPCODE_0 | ERR_DROPPED_DB |
                              ERR_DATA_CPL_ON_HIGH_QID1 |
                              ERR_DATA_CPL_ON_HIGH_QID0 | ERR_BAD_DB_PIDX3 |
                              ERR_BAD_DB_PIDX2 | ERR_BAD_DB_PIDX1 |
                              ERR_BAD_DB_PIDX0 | ERR_ING_CTXT_PRIO |
                              ERR_EGR_CTXT_PRIO | INGRESS_SIZE_ERR,
                              SGE_INT_ENABLE3);
                csio_set_reg_field(hw, PL_INT_MAP0, 0, 1 << pf);
        }

        hw->flags |= CSIO_HWF_HW_INTR_ENABLED;

}

/*
 * csio_hw_intr_disable - Disable HW interrupts
 * @hw: Pointer to HW module.
 *
 * Turn off Mailbox and PCI_PF_CFG interrupts.
 */
void
csio_hw_intr_disable(struct csio_hw *hw)
{
        uint32_t pf = SOURCEPF_GET(csio_rd_reg32(hw, PL_WHOAMI));

        if (!(hw->flags & CSIO_HWF_HW_INTR_ENABLED))
                return;

        hw->flags &= ~CSIO_HWF_HW_INTR_ENABLED;

        csio_wr_reg32(hw, 0, MYPF_REG(PL_PF_INT_ENABLE));
        if (csio_is_hw_master(hw))
                csio_set_reg_field(hw, PL_INT_MAP0, 1 << pf, 0);

        /* Turn off MB interrupts */
        csio_mb_intr_disable(hw);

}

void
csio_hw_fatal_err(struct csio_hw *hw)
{
        csio_set_reg_field(hw, SGE_CONTROL, GLOBALENABLE, 0);
        csio_hw_intr_disable(hw);

        /* Do not reset HW, we may need FW state for debugging */
        csio_fatal(hw, "HW Fatal error encountered!\n");
}

/*****************************************************************************/
/* START: HW SM                                                              */
/*****************************************************************************/
/*
 * csio_hws_uninit - Uninit state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_uninit(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_CFG:
                csio_set_state(&hw->sm, csio_hws_configuring);
                csio_hw_configure(hw);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_configuring - Configuring state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_configuring(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_INIT:
                csio_set_state(&hw->sm, csio_hws_initializing);
                csio_hw_initialize(hw);
                break;

        case CSIO_HWE_INIT_DONE:
                csio_set_state(&hw->sm, csio_hws_ready);
                /* Fan out event to all lnode SMs */
                csio_notify_lnodes(hw, CSIO_LN_NOTIFY_HWREADY);
                break;

        case CSIO_HWE_FATAL:
                csio_set_state(&hw->sm, csio_hws_uninit);
                break;

        case CSIO_HWE_PCI_REMOVE:
                csio_do_bye(hw);
                break;
        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_initializing - Initialiazing state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_initializing(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_INIT_DONE:
                csio_set_state(&hw->sm, csio_hws_ready);

                /* Fan out event to all lnode SMs */
                csio_notify_lnodes(hw, CSIO_LN_NOTIFY_HWREADY);

                /* Enable interrupts */
                csio_hw_intr_enable(hw);
                break;

        case CSIO_HWE_FATAL:
                csio_set_state(&hw->sm, csio_hws_uninit);
                break;

        case CSIO_HWE_PCI_REMOVE:
                csio_do_bye(hw);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_ready - Ready state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_ready(struct csio_hw *hw, enum csio_hw_ev evt)
{
        /* Remember the event */
        hw->evtflag = evt;

        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_HBA_RESET:
        case CSIO_HWE_FW_DLOAD:
        case CSIO_HWE_SUSPEND:
        case CSIO_HWE_PCI_REMOVE:
        case CSIO_HWE_PCIERR_DETECTED:
                csio_set_state(&hw->sm, csio_hws_quiescing);
                /* cleanup all outstanding cmds */
                if (evt == CSIO_HWE_HBA_RESET ||
                    evt == CSIO_HWE_PCIERR_DETECTED)
                        csio_scsim_cleanup_io(csio_hw_to_scsim(hw), false);
                else
                        csio_scsim_cleanup_io(csio_hw_to_scsim(hw), true);

                csio_hw_intr_disable(hw);
                csio_hw_mbm_cleanup(hw);
                csio_evtq_stop(hw);
                csio_notify_lnodes(hw, CSIO_LN_NOTIFY_HWSTOP);
                csio_evtq_flush(hw);
                csio_mgmtm_cleanup(csio_hw_to_mgmtm(hw));
                csio_post_event(&hw->sm, CSIO_HWE_QUIESCED);
                break;

        case CSIO_HWE_FATAL:
                csio_set_state(&hw->sm, csio_hws_uninit);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_quiescing - Quiescing state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_quiescing(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_QUIESCED:
                switch (hw->evtflag) {
                case CSIO_HWE_FW_DLOAD:
                        csio_set_state(&hw->sm, csio_hws_resetting);
                        /* Download firmware */
                        /* Fall through */

                case CSIO_HWE_HBA_RESET:
                        csio_set_state(&hw->sm, csio_hws_resetting);
                        /* Start reset of the HBA */
                        csio_notify_lnodes(hw, CSIO_LN_NOTIFY_HWRESET);
                        csio_wr_destroy_queues(hw, false);
                        csio_do_reset(hw, false);
                        csio_post_event(&hw->sm, CSIO_HWE_HBA_RESET_DONE);
                        break;

                case CSIO_HWE_PCI_REMOVE:
                        csio_set_state(&hw->sm, csio_hws_removing);
                        csio_notify_lnodes(hw, CSIO_LN_NOTIFY_HWREMOVE);
                        csio_wr_destroy_queues(hw, true);
                        /* Now send the bye command */
                        csio_do_bye(hw);
                        break;

                case CSIO_HWE_SUSPEND:
                        csio_set_state(&hw->sm, csio_hws_quiesced);
                        break;

                case CSIO_HWE_PCIERR_DETECTED:
                        csio_set_state(&hw->sm, csio_hws_pcierr);
                        csio_wr_destroy_queues(hw, false);
                        break;

                default:
                        CSIO_INC_STATS(hw, n_evt_unexp);
                        break;

                }
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_quiesced - Quiesced state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_quiesced(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_RESUME:
                csio_set_state(&hw->sm, csio_hws_configuring);
                csio_hw_configure(hw);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_resetting - HW Resetting state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_resetting(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_HBA_RESET_DONE:
                csio_evtq_start(hw);
                csio_set_state(&hw->sm, csio_hws_configuring);
                csio_hw_configure(hw);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*
 * csio_hws_removing - PCI Hotplug removing state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_removing(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_HBA_RESET:
                if (!csio_is_hw_master(hw))
                        break;
                /*
                 * The BYE should have alerady been issued, so we cant
                 * use the mailbox interface. Hence we use the PL_RST
                 * register directly.
                 */
                csio_err(hw, "Resetting HW and waiting 2 seconds...\n");
                csio_wr_reg32(hw, PIORSTMODE | PIORST, PL_RST);
                mdelay(2000);
                break;

        /* Should never receive any new events */
        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;

        }
}

/*
 * csio_hws_pcierr - PCI Error state
 * @hw - HW module
 * @evt - Event
 *
 */
static void
csio_hws_pcierr(struct csio_hw *hw, enum csio_hw_ev evt)
{
        hw->prev_evt = hw->cur_evt;
        hw->cur_evt = evt;
        CSIO_INC_STATS(hw, n_evt_sm[evt]);

        switch (evt) {
        case CSIO_HWE_PCIERR_SLOT_RESET:
                csio_evtq_start(hw);
                csio_set_state(&hw->sm, csio_hws_configuring);
                csio_hw_configure(hw);
                break;

        default:
                CSIO_INC_STATS(hw, n_evt_unexp);
                break;
        }
}

/*****************************************************************************/
/* END: HW SM                                                                */
/*****************************************************************************/

/*
 *      csio_handle_intr_status - table driven interrupt handler
 *      @hw: HW instance
 *      @reg: the interrupt status register to process
 *      @acts: table of interrupt actions
 *
 *      A table driven interrupt handler that applies a set of masks to an
 *      interrupt status word and performs the corresponding actions if the
 *      interrupts described by the mask have occured.  The actions include
 *      optionally emitting a warning or alert message. The table is terminated
 *      by an entry specifying mask 0.  Returns the number of fatal interrupt
 *      conditions.
 */
int
csio_handle_intr_status(struct csio_hw *hw, unsigned int reg,
                                 const struct intr_info *acts)
{
        int fatal = 0;
        unsigned int mask = 0;
        unsigned int status = csio_rd_reg32(hw, reg);

        for ( ; acts->mask; ++acts) {
                if (!(status & acts->mask))
                        continue;
                if (acts->fatal) {
                        fatal++;
                        csio_fatal(hw, "Fatal %s (0x%x)\n",
                                    acts->msg, status & acts->mask);
                } else if (acts->msg)
                        csio_info(hw, "%s (0x%x)\n",
                                    acts->msg, status & acts->mask);
                mask |= acts->mask;
        }
        status &= mask;
        if (status)                           /* clear processed interrupts */
                csio_wr_reg32(hw, status, reg);
        return fatal;
}

/*
 * TP interrupt handler.
 */
static void csio_tp_intr_handler(struct csio_hw *hw)
{
        static struct intr_info tp_intr_info[] = {
                { 0x3fffffff, "TP parity error", -1, 1 },
                { FLMTXFLSTEMPTY, "TP out of Tx pages", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, TP_INT_CAUSE, tp_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * SGE interrupt handler.
 */
static void csio_sge_intr_handler(struct csio_hw *hw)
{
        uint64_t v;

        static struct intr_info sge_intr_info[] = {
                { ERR_CPL_EXCEED_IQE_SIZE,
                  "SGE received CPL exceeding IQE size", -1, 1 },
                { ERR_INVALID_CIDX_INC,
                  "SGE GTS CIDX increment too large", -1, 0 },
                { ERR_CPL_OPCODE_0, "SGE received 0-length CPL", -1, 0 },
                { ERR_DROPPED_DB, "SGE doorbell dropped", -1, 0 },
                { ERR_DATA_CPL_ON_HIGH_QID1 | ERR_DATA_CPL_ON_HIGH_QID0,
                  "SGE IQID > 1023 received CPL for FL", -1, 0 },
                { ERR_BAD_DB_PIDX3, "SGE DBP 3 pidx increment too large", -1,
                  0 },
                { ERR_BAD_DB_PIDX2, "SGE DBP 2 pidx increment too large", -1,
                  0 },
                { ERR_BAD_DB_PIDX1, "SGE DBP 1 pidx increment too large", -1,
                  0 },
                { ERR_BAD_DB_PIDX0, "SGE DBP 0 pidx increment too large", -1,
                  0 },
                { ERR_ING_CTXT_PRIO,
                  "SGE too many priority ingress contexts", -1, 0 },
                { ERR_EGR_CTXT_PRIO,
                  "SGE too many priority egress contexts", -1, 0 },
                { INGRESS_SIZE_ERR, "SGE illegal ingress QID", -1, 0 },
                { EGRESS_SIZE_ERR, "SGE illegal egress QID", -1, 0 },
                { 0, NULL, 0, 0 }
        };

        v = (uint64_t)csio_rd_reg32(hw, SGE_INT_CAUSE1) |
            ((uint64_t)csio_rd_reg32(hw, SGE_INT_CAUSE2) << 32);
        if (v) {
                csio_fatal(hw, "SGE parity error (%#llx)\n",
                            (unsigned long long)v);
                csio_wr_reg32(hw, (uint32_t)(v & 0xFFFFFFFF),
                                                SGE_INT_CAUSE1);
                csio_wr_reg32(hw, (uint32_t)(v >> 32), SGE_INT_CAUSE2);
        }

        v |= csio_handle_intr_status(hw, SGE_INT_CAUSE3, sge_intr_info);

        if (csio_handle_intr_status(hw, SGE_INT_CAUSE3, sge_intr_info) ||
            v != 0)
                csio_hw_fatal_err(hw);
}

#define CIM_OBQ_INTR (OBQULP0PARERR | OBQULP1PARERR | OBQULP2PARERR |\
                      OBQULP3PARERR | OBQSGEPARERR | OBQNCSIPARERR)
#define CIM_IBQ_INTR (IBQTP0PARERR | IBQTP1PARERR | IBQULPPARERR |\
                      IBQSGEHIPARERR | IBQSGELOPARERR | IBQNCSIPARERR)

/*
 * CIM interrupt handler.
 */
static void csio_cim_intr_handler(struct csio_hw *hw)
{
        static struct intr_info cim_intr_info[] = {
                { PREFDROPINT, "CIM control register prefetch drop", -1, 1 },
                { CIM_OBQ_INTR, "CIM OBQ parity error", -1, 1 },
                { CIM_IBQ_INTR, "CIM IBQ parity error", -1, 1 },
                { MBUPPARERR, "CIM mailbox uP parity error", -1, 1 },
                { MBHOSTPARERR, "CIM mailbox host parity error", -1, 1 },
                { TIEQINPARERRINT, "CIM TIEQ outgoing parity error", -1, 1 },
                { TIEQOUTPARERRINT, "CIM TIEQ incoming parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info cim_upintr_info[] = {
                { RSVDSPACEINT, "CIM reserved space access", -1, 1 },
                { ILLTRANSINT, "CIM illegal transaction", -1, 1 },
                { ILLWRINT, "CIM illegal write", -1, 1 },
                { ILLRDINT, "CIM illegal read", -1, 1 },
                { ILLRDBEINT, "CIM illegal read BE", -1, 1 },
                { ILLWRBEINT, "CIM illegal write BE", -1, 1 },
                { SGLRDBOOTINT, "CIM single read from boot space", -1, 1 },
                { SGLWRBOOTINT, "CIM single write to boot space", -1, 1 },
                { BLKWRBOOTINT, "CIM block write to boot space", -1, 1 },
                { SGLRDFLASHINT, "CIM single read from flash space", -1, 1 },
                { SGLWRFLASHINT, "CIM single write to flash space", -1, 1 },
                { BLKWRFLASHINT, "CIM block write to flash space", -1, 1 },
                { SGLRDEEPROMINT, "CIM single EEPROM read", -1, 1 },
                { SGLWREEPROMINT, "CIM single EEPROM write", -1, 1 },
                { BLKRDEEPROMINT, "CIM block EEPROM read", -1, 1 },
                { BLKWREEPROMINT, "CIM block EEPROM write", -1, 1 },
                { SGLRDCTLINT , "CIM single read from CTL space", -1, 1 },
                { SGLWRCTLINT , "CIM single write to CTL space", -1, 1 },
                { BLKRDCTLINT , "CIM block read from CTL space", -1, 1 },
                { BLKWRCTLINT , "CIM block write to CTL space", -1, 1 },
                { SGLRDPLINT , "CIM single read from PL space", -1, 1 },
                { SGLWRPLINT , "CIM single write to PL space", -1, 1 },
                { BLKRDPLINT , "CIM block read from PL space", -1, 1 },
                { BLKWRPLINT , "CIM block write to PL space", -1, 1 },
                { REQOVRLOOKUPINT , "CIM request FIFO overwrite", -1, 1 },
                { RSPOVRLOOKUPINT , "CIM response FIFO overwrite", -1, 1 },
                { TIMEOUTINT , "CIM PIF timeout", -1, 1 },
                { TIMEOUTMAINT , "CIM PIF MA timeout", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        int fat;

        fat = csio_handle_intr_status(hw, CIM_HOST_INT_CAUSE,
                                    cim_intr_info) +
              csio_handle_intr_status(hw, CIM_HOST_UPACC_INT_CAUSE,
                                    cim_upintr_info);
        if (fat)
                csio_hw_fatal_err(hw);
}

/*
 * ULP RX interrupt handler.
 */
static void csio_ulprx_intr_handler(struct csio_hw *hw)
{
        static struct intr_info ulprx_intr_info[] = {
                { 0x1800000, "ULPRX context error", -1, 1 },
                { 0x7fffff, "ULPRX parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, ULP_RX_INT_CAUSE, ulprx_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * ULP TX interrupt handler.
 */
static void csio_ulptx_intr_handler(struct csio_hw *hw)
{
        static struct intr_info ulptx_intr_info[] = {
                { PBL_BOUND_ERR_CH3, "ULPTX channel 3 PBL out of bounds", -1,
                  0 },
                { PBL_BOUND_ERR_CH2, "ULPTX channel 2 PBL out of bounds", -1,
                  0 },
                { PBL_BOUND_ERR_CH1, "ULPTX channel 1 PBL out of bounds", -1,
                  0 },
                { PBL_BOUND_ERR_CH0, "ULPTX channel 0 PBL out of bounds", -1,
                  0 },
                { 0xfffffff, "ULPTX parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, ULP_TX_INT_CAUSE, ulptx_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * PM TX interrupt handler.
 */
static void csio_pmtx_intr_handler(struct csio_hw *hw)
{
        static struct intr_info pmtx_intr_info[] = {
                { PCMD_LEN_OVFL0, "PMTX channel 0 pcmd too large", -1, 1 },
                { PCMD_LEN_OVFL1, "PMTX channel 1 pcmd too large", -1, 1 },
                { PCMD_LEN_OVFL2, "PMTX channel 2 pcmd too large", -1, 1 },
                { ZERO_C_CMD_ERROR, "PMTX 0-length pcmd", -1, 1 },
                { 0xffffff0, "PMTX framing error", -1, 1 },
                { OESPI_PAR_ERROR, "PMTX oespi parity error", -1, 1 },
                { DB_OPTIONS_PAR_ERROR, "PMTX db_options parity error", -1,
                  1 },
                { ICSPI_PAR_ERROR, "PMTX icspi parity error", -1, 1 },
                { C_PCMD_PAR_ERROR, "PMTX c_pcmd parity error", -1, 1},
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, PM_TX_INT_CAUSE, pmtx_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * PM RX interrupt handler.
 */
static void csio_pmrx_intr_handler(struct csio_hw *hw)
{
        static struct intr_info pmrx_intr_info[] = {
                { ZERO_E_CMD_ERROR, "PMRX 0-length pcmd", -1, 1 },
                { 0x3ffff0, "PMRX framing error", -1, 1 },
                { OCSPI_PAR_ERROR, "PMRX ocspi parity error", -1, 1 },
                { DB_OPTIONS_PAR_ERROR, "PMRX db_options parity error", -1,
                  1 },
                { IESPI_PAR_ERROR, "PMRX iespi parity error", -1, 1 },
                { E_PCMD_PAR_ERROR, "PMRX e_pcmd parity error", -1, 1},
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, PM_RX_INT_CAUSE, pmrx_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * CPL switch interrupt handler.
 */
static void csio_cplsw_intr_handler(struct csio_hw *hw)
{
        static struct intr_info cplsw_intr_info[] = {
                { CIM_OP_MAP_PERR, "CPLSW CIM op_map parity error", -1, 1 },
                { CIM_OVFL_ERROR, "CPLSW CIM overflow", -1, 1 },
                { TP_FRAMING_ERROR, "CPLSW TP framing error", -1, 1 },
                { SGE_FRAMING_ERROR, "CPLSW SGE framing error", -1, 1 },
                { CIM_FRAMING_ERROR, "CPLSW CIM framing error", -1, 1 },
                { ZERO_SWITCH_ERROR, "CPLSW no-switch error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, CPL_INTR_CAUSE, cplsw_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * LE interrupt handler.
 */
static void csio_le_intr_handler(struct csio_hw *hw)
{
        static struct intr_info le_intr_info[] = {
                { LIPMISS, "LE LIP miss", -1, 0 },
                { LIP0, "LE 0 LIP error", -1, 0 },
                { PARITYERR, "LE parity error", -1, 1 },
                { UNKNOWNCMD, "LE unknown command", -1, 1 },
                { REQQPARERR, "LE request queue parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, LE_DB_INT_CAUSE, le_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * MPS interrupt handler.
 */
static void csio_mps_intr_handler(struct csio_hw *hw)
{
        static struct intr_info mps_rx_intr_info[] = {
                { 0xffffff, "MPS Rx parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_tx_intr_info[] = {
                { TPFIFO, "MPS Tx TP FIFO parity error", -1, 1 },
                { NCSIFIFO, "MPS Tx NC-SI FIFO parity error", -1, 1 },
                { TXDATAFIFO, "MPS Tx data FIFO parity error", -1, 1 },
                { TXDESCFIFO, "MPS Tx desc FIFO parity error", -1, 1 },
                { BUBBLE, "MPS Tx underflow", -1, 1 },
                { SECNTERR, "MPS Tx SOP/EOP error", -1, 1 },
                { FRMERR, "MPS Tx framing error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_trc_intr_info[] = {
                { FILTMEM, "MPS TRC filter parity error", -1, 1 },
                { PKTFIFO, "MPS TRC packet FIFO parity error", -1, 1 },
                { MISCPERR, "MPS TRC misc parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_stat_sram_intr_info[] = {
                { 0x1fffff, "MPS statistics SRAM parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_stat_tx_intr_info[] = {
                { 0xfffff, "MPS statistics Tx FIFO parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_stat_rx_intr_info[] = {
                { 0xffffff, "MPS statistics Rx FIFO parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };
        static struct intr_info mps_cls_intr_info[] = {
                { MATCHSRAM, "MPS match SRAM parity error", -1, 1 },
                { MATCHTCAM, "MPS match TCAM parity error", -1, 1 },
                { HASHSRAM, "MPS hash SRAM parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        int fat;

        fat = csio_handle_intr_status(hw, MPS_RX_PERR_INT_CAUSE,
                                    mps_rx_intr_info) +
              csio_handle_intr_status(hw, MPS_TX_INT_CAUSE,
                                    mps_tx_intr_info) +
              csio_handle_intr_status(hw, MPS_TRC_INT_CAUSE,
                                    mps_trc_intr_info) +
              csio_handle_intr_status(hw, MPS_STAT_PERR_INT_CAUSE_SRAM,
                                    mps_stat_sram_intr_info) +
              csio_handle_intr_status(hw, MPS_STAT_PERR_INT_CAUSE_TX_FIFO,
                                    mps_stat_tx_intr_info) +
              csio_handle_intr_status(hw, MPS_STAT_PERR_INT_CAUSE_RX_FIFO,
                                    mps_stat_rx_intr_info) +
              csio_handle_intr_status(hw, MPS_CLS_INT_CAUSE,
                                    mps_cls_intr_info);

        csio_wr_reg32(hw, 0, MPS_INT_CAUSE);
        csio_rd_reg32(hw, MPS_INT_CAUSE);                    /* flush */
        if (fat)
                csio_hw_fatal_err(hw);
}

#define MEM_INT_MASK (PERR_INT_CAUSE | ECC_CE_INT_CAUSE | ECC_UE_INT_CAUSE)

/*
 * EDC/MC interrupt handler.
 */
static void csio_mem_intr_handler(struct csio_hw *hw, int idx)
{
        static const char name[3][5] = { "EDC0", "EDC1", "MC" };

        unsigned int addr, cnt_addr, v;

        if (idx <= MEM_EDC1) {
                addr = EDC_REG(EDC_INT_CAUSE, idx);
                cnt_addr = EDC_REG(EDC_ECC_STATUS, idx);
        } else {
                addr = MC_INT_CAUSE;
                cnt_addr = MC_ECC_STATUS;
        }

        v = csio_rd_reg32(hw, addr) & MEM_INT_MASK;
        if (v & PERR_INT_CAUSE)
                csio_fatal(hw, "%s FIFO parity error\n", name[idx]);
        if (v & ECC_CE_INT_CAUSE) {
                uint32_t cnt = ECC_CECNT_GET(csio_rd_reg32(hw, cnt_addr));

                csio_wr_reg32(hw, ECC_CECNT_MASK, cnt_addr);
                csio_warn(hw, "%u %s correctable ECC data error%s\n",
                            cnt, name[idx], cnt > 1 ? "s" : "");
        }
        if (v & ECC_UE_INT_CAUSE)
                csio_fatal(hw, "%s uncorrectable ECC data error\n", name[idx]);

        csio_wr_reg32(hw, v, addr);
        if (v & (PERR_INT_CAUSE | ECC_UE_INT_CAUSE))
                csio_hw_fatal_err(hw);
}

/*
 * MA interrupt handler.
 */
static void csio_ma_intr_handler(struct csio_hw *hw)
{
        uint32_t v, status = csio_rd_reg32(hw, MA_INT_CAUSE);

        if (status & MEM_PERR_INT_CAUSE)
                csio_fatal(hw, "MA parity error, parity status %#x\n",
                            csio_rd_reg32(hw, MA_PARITY_ERROR_STATUS));
        if (status & MEM_WRAP_INT_CAUSE) {
                v = csio_rd_reg32(hw, MA_INT_WRAP_STATUS);
                csio_fatal(hw,
                   "MA address wrap-around error by client %u to address %#x\n",
                   MEM_WRAP_CLIENT_NUM_GET(v), MEM_WRAP_ADDRESS_GET(v) << 4);
        }
        csio_wr_reg32(hw, status, MA_INT_CAUSE);
        csio_hw_fatal_err(hw);
}

/*
 * SMB interrupt handler.
 */
static void csio_smb_intr_handler(struct csio_hw *hw)
{
        static struct intr_info smb_intr_info[] = {
                { MSTTXFIFOPARINT, "SMB master Tx FIFO parity error", -1, 1 },
                { MSTRXFIFOPARINT, "SMB master Rx FIFO parity error", -1, 1 },
                { SLVFIFOPARINT, "SMB slave FIFO parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, SMB_INT_CAUSE, smb_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * NC-SI interrupt handler.
 */
static void csio_ncsi_intr_handler(struct csio_hw *hw)
{
        static struct intr_info ncsi_intr_info[] = {
                { CIM_DM_PRTY_ERR, "NC-SI CIM parity error", -1, 1 },
                { MPS_DM_PRTY_ERR, "NC-SI MPS parity error", -1, 1 },
                { TXFIFO_PRTY_ERR, "NC-SI Tx FIFO parity error", -1, 1 },
                { RXFIFO_PRTY_ERR, "NC-SI Rx FIFO parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, NCSI_INT_CAUSE, ncsi_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 * XGMAC interrupt handler.
 */
static void csio_xgmac_intr_handler(struct csio_hw *hw, int port)
{
        uint32_t v = csio_rd_reg32(hw, CSIO_MAC_INT_CAUSE_REG(hw, port));

        v &= TXFIFO_PRTY_ERR | RXFIFO_PRTY_ERR;
        if (!v)
                return;

        if (v & TXFIFO_PRTY_ERR)
                csio_fatal(hw, "XGMAC %d Tx FIFO parity error\n", port);
        if (v & RXFIFO_PRTY_ERR)
                csio_fatal(hw, "XGMAC %d Rx FIFO parity error\n", port);
        csio_wr_reg32(hw, v, CSIO_MAC_INT_CAUSE_REG(hw, port));
        csio_hw_fatal_err(hw);
}

/*
 * PL interrupt handler.
 */
static void csio_pl_intr_handler(struct csio_hw *hw)
{
        static struct intr_info pl_intr_info[] = {
                { FATALPERR, "T4 fatal parity error", -1, 1 },
                { PERRVFID, "PL VFID_MAP parity error", -1, 1 },
                { 0, NULL, 0, 0 }
        };

        if (csio_handle_intr_status(hw, PL_PL_INT_CAUSE, pl_intr_info))
                csio_hw_fatal_err(hw);
}

/*
 *      csio_hw_slow_intr_handler - control path interrupt handler
 *      @hw: HW module
 *
 *      Interrupt handler for non-data global interrupt events, e.g., errors.
 *      The designation 'slow' is because it involves register reads, while
 *      data interrupts typically don't involve any MMIOs.
 */
int
csio_hw_slow_intr_handler(struct csio_hw *hw)
{
        uint32_t cause = csio_rd_reg32(hw, PL_INT_CAUSE);

        if (!(cause & CSIO_GLBL_INTR_MASK)) {
                CSIO_INC_STATS(hw, n_plint_unexp);
                return 0;
        }

        csio_dbg(hw, "Slow interrupt! cause: 0x%x\n", cause);

        CSIO_INC_STATS(hw, n_plint_cnt);

        if (cause & CIM)
                csio_cim_intr_handler(hw);

        if (cause & MPS)
                csio_mps_intr_handler(hw);

        if (cause & NCSI)
                csio_ncsi_intr_handler(hw);

        if (cause & PL)
                csio_pl_intr_handler(hw);

        if (cause & SMB)
                csio_smb_intr_handler(hw);

        if (cause & XGMAC0)
                csio_xgmac_intr_handler(hw, 0);

        if (cause & XGMAC1)
                csio_xgmac_intr_handler(hw, 1);

        if (cause & XGMAC_KR0)
                csio_xgmac_intr_handler(hw, 2);

        if (cause & XGMAC_KR1)
                csio_xgmac_intr_handler(hw, 3);

        if (cause & PCIE)
                hw->chip_ops->chip_pcie_intr_handler(hw);

        if (cause & MC)
                csio_mem_intr_handler(hw, MEM_MC);

        if (cause & EDC0)
                csio_mem_intr_handler(hw, MEM_EDC0);

        if (cause & EDC1)
                csio_mem_intr_handler(hw, MEM_EDC1);

        if (cause & LE)
                csio_le_intr_handler(hw);

        if (cause & TP)
                csio_tp_intr_handler(hw);

        if (cause & MA)
                csio_ma_intr_handler(hw);

        if (cause & PM_TX)
                csio_pmtx_intr_handler(hw);

        if (cause & PM_RX)
                csio_pmrx_intr_handler(hw);

        if (cause & ULP_RX)
                csio_ulprx_intr_handler(hw);

        if (cause & CPL_SWITCH)
                csio_cplsw_intr_handler(hw);

        if (cause & SGE)
                csio_sge_intr_handler(hw);

        if (cause & ULP_TX)
                csio_ulptx_intr_handler(hw);

        /* Clear the interrupts just processed for which we are the master. */
        csio_wr_reg32(hw, cause & CSIO_GLBL_INTR_MASK, PL_INT_CAUSE);
        csio_rd_reg32(hw, PL_INT_CAUSE); /* flush */

        return 1;
}

/*****************************************************************************
 * HW <--> mailbox interfacing routines.
 ****************************************************************************/
/*
 * csio_mberr_worker - Worker thread (dpc) for mailbox/error completions
 *
 * @data: Private data pointer.
 *
 * Called from worker thread context.
 */
static void
csio_mberr_worker(void *data)
{
        struct csio_hw *hw = (struct csio_hw *)data;
        struct csio_mbm *mbm = &hw->mbm;
        LIST_HEAD(cbfn_q);
        struct csio_mb *mbp_next;
        int rv;

        del_timer_sync(&mbm->timer);

        spin_lock_irq(&hw->lock);
        if (list_empty(&mbm->cbfn_q)) {
                spin_unlock_irq(&hw->lock);
                return;
        }

        list_splice_tail_init(&mbm->cbfn_q, &cbfn_q);
        mbm->stats.n_cbfnq = 0;

        /* Try to start waiting mailboxes */
        if (!list_empty(&mbm->req_q)) {
                mbp_next = list_first_entry(&mbm->req_q, struct csio_mb, list);
                list_del_init(&mbp_next->list);

                rv = csio_mb_issue(hw, mbp_next);
                if (rv != 0)
                        list_add_tail(&mbp_next->list, &mbm->req_q);
                else
                        CSIO_DEC_STATS(mbm, n_activeq);
        }
        spin_unlock_irq(&hw->lock);

        /* Now callback completions */
        csio_mb_completions(hw, &cbfn_q);
}

/*
 * csio_hw_mb_timer - Top-level Mailbox timeout handler.
 *
 * @data: private data pointer
 *
 **/
static void
csio_hw_mb_timer(uintptr_t data)
{
        struct csio_hw *hw = (struct csio_hw *)data;
        struct csio_mb *mbp = NULL;

        spin_lock_irq(&hw->lock);
        mbp = csio_mb_tmo_handler(hw);
        spin_unlock_irq(&hw->lock);

        /* Call back the function for the timed-out Mailbox */
        if (mbp)
                mbp->mb_cbfn(hw, mbp);

}

/*
 * csio_hw_mbm_cleanup - Cleanup Mailbox module.
 * @hw: HW module
 *
 * Called with lock held, should exit with lock held.
 * Cancels outstanding mailboxes (waiting, in-flight) and gathers them
 * into a local queue. Drops lock and calls the completions. Holds
 * lock and returns.
 */
static void
csio_hw_mbm_cleanup(struct csio_hw *hw)
{
        LIST_HEAD(cbfn_q);

        csio_mb_cancel_all(hw, &cbfn_q);

        spin_unlock_irq(&hw->lock);
        csio_mb_completions(hw, &cbfn_q);
        spin_lock_irq(&hw->lock);
}

/*****************************************************************************
 * Event handling
 ****************************************************************************/
int
csio_enqueue_evt(struct csio_hw *hw, enum csio_evt type, void *evt_msg,
                        uint16_t len)
{
        struct csio_evt_msg *evt_entry = NULL;

        if (type >= CSIO_EVT_MAX)
                return -EINVAL;

        if (len > CSIO_EVT_MSG_SIZE)
                return -EINVAL;

        if (hw->flags & CSIO_HWF_FWEVT_STOP)
                return -EINVAL;

        if (list_empty(&hw->evt_free_q)) {
                csio_err(hw, "Failed to alloc evt entry, msg type %d len %d\n",
                         type, len);
                return -ENOMEM;
        }

        evt_entry = list_first_entry(&hw->evt_free_q,
                                     struct csio_evt_msg, list);
        list_del_init(&evt_entry->list);

        /* copy event msg and queue the event */
        evt_entry->type = type;
        memcpy((void *)evt_entry->data, evt_msg, len);
        list_add_tail(&evt_entry->list, &hw->evt_active_q);

        CSIO_DEC_STATS(hw, n_evt_freeq);
        CSIO_INC_STATS(hw, n_evt_activeq);

        return 0;
}

static int
csio_enqueue_evt_lock(struct csio_hw *hw, enum csio_evt type, void *evt_msg,
                        uint16_t len, bool msg_sg)
{
        struct csio_evt_msg *evt_entry = NULL;
        struct csio_fl_dma_buf *fl_sg;
        uint32_t off = 0;
        unsigned long flags;
        int n, ret = 0;

        if (type >= CSIO_EVT_MAX)
                return -EINVAL;

        if (len > CSIO_EVT_MSG_SIZE)
                return -EINVAL;

        spin_lock_irqsave(&hw->lock, flags);
        if (hw->flags & CSIO_HWF_FWEVT_STOP) {
                ret = -EINVAL;
                goto out;
        }

        if (list_empty(&hw->evt_free_q)) {
                csio_err(hw, "Failed to alloc evt entry, msg type %d len %d\n",
                         type, len);
                ret = -ENOMEM;
                goto out;
        }

        evt_entry = list_first_entry(&hw->evt_free_q,
                                     struct csio_evt_msg, list);
        list_del_init(&evt_entry->list);

        /* copy event msg and queue the event */
        evt_entry->type = type;

        /* If Payload in SG list*/
        if (msg_sg) {
                fl_sg = (struct csio_fl_dma_buf *) evt_msg;
                for (n = 0; (n < CSIO_MAX_FLBUF_PER_IQWR && off < len); n++) {
                        memcpy((void *)((uintptr_t)evt_entry->data + off),
                                fl_sg->flbufs[n].vaddr,
                                fl_sg->flbufs[n].len);
                        off += fl_sg->flbufs[n].len;
                }
        } else
                memcpy((void *)evt_entry->data, evt_msg, len);

        list_add_tail(&evt_entry->list, &hw->evt_active_q);
        CSIO_DEC_STATS(hw, n_evt_freeq);
        CSIO_INC_STATS(hw, n_evt_activeq);
out:
        spin_unlock_irqrestore(&hw->lock, flags);
        return ret;
}

static void
csio_free_evt(struct csio_hw *hw, struct csio_evt_msg *evt_entry)
{
        if (evt_entry) {
                spin_lock_irq(&hw->lock);
                list_del_init(&evt_entry->list);
                list_add_tail(&evt_entry->list, &hw->evt_free_q);
                CSIO_DEC_STATS(hw, n_evt_activeq);
                CSIO_INC_STATS(hw, n_evt_freeq);
                spin_unlock_irq(&hw->lock);
        }
}

void
csio_evtq_flush(struct csio_hw *hw)
{
        uint32_t count;
        count = 30;
        while (hw->flags & CSIO_HWF_FWEVT_PENDING && count--) {
                spin_unlock_irq(&hw->lock);
                msleep(2000);
                spin_lock_irq(&hw->lock);
        }

        CSIO_DB_ASSERT(!(hw->flags & CSIO_HWF_FWEVT_PENDING));
}

static void
csio_evtq_stop(struct csio_hw *hw)
{
        hw->flags |= CSIO_HWF_FWEVT_STOP;
}

static void
csio_evtq_start(struct csio_hw *hw)
{
        hw->flags &= ~CSIO_HWF_FWEVT_STOP;
}

static void
csio_evtq_cleanup(struct csio_hw *hw)
{
        struct list_head *evt_entry, *next_entry;

        /* Release outstanding events from activeq to freeq*/
        if (!list_empty(&hw->evt_active_q))
                list_splice_tail_init(&hw->evt_active_q, &hw->evt_free_q);

        hw->stats.n_evt_activeq = 0;
        hw->flags &= ~CSIO_HWF_FWEVT_PENDING;

        /* Freeup event entry */
        list_for_each_safe(evt_entry, next_entry, &hw->evt_free_q) {
                kfree(evt_entry);
                CSIO_DEC_STATS(hw, n_evt_freeq);
        }

        hw->stats.n_evt_freeq = 0;
}


static void
csio_process_fwevtq_entry(struct csio_hw *hw, void *wr, uint32_t len,
                          struct csio_fl_dma_buf *flb, void *priv)
{
        __u8 op;
        void *msg = NULL;
        uint32_t msg_len = 0;
        bool msg_sg = 0;

        op = ((struct rss_header *) wr)->opcode;
        if (op == CPL_FW6_PLD) {
                CSIO_INC_STATS(hw, n_cpl_fw6_pld);
                if (!flb || !flb->totlen) {
                        CSIO_INC_STATS(hw, n_cpl_unexp);
                        return;
                }

                msg = (void *) flb;
                msg_len = flb->totlen;
                msg_sg = 1;
        } else if (op == CPL_FW6_MSG || op == CPL_FW4_MSG) {

                CSIO_INC_STATS(hw, n_cpl_fw6_msg);
                /* skip RSS header */
                msg = (void *)((uintptr_t)wr + sizeof(__be64));
                msg_len = (op == CPL_FW6_MSG) ? sizeof(struct cpl_fw6_msg) :
                           sizeof(struct cpl_fw4_msg);
        } else {
                csio_warn(hw, "unexpected CPL %#x on FW event queue\n", op);
                CSIO_INC_STATS(hw, n_cpl_unexp);
                return;
        }

        /*
         * Enqueue event to EventQ. Events processing happens
         * in Event worker thread context
         */
        if (csio_enqueue_evt_lock(hw, CSIO_EVT_FW, msg,
                                  (uint16_t)msg_len, msg_sg))
                CSIO_INC_STATS(hw, n_evt_drop);
}

void
csio_evtq_worker(struct work_struct *work)
{
        struct csio_hw *hw = container_of(work, struct csio_hw, evtq_work);
        struct list_head *evt_entry, *next_entry;
        LIST_HEAD(evt_q);
        struct csio_evt_msg     *evt_msg;
        struct cpl_fw6_msg *msg;
        struct csio_rnode *rn;
        int rv = 0;
        uint8_t evtq_stop = 0;

        csio_dbg(hw, "event worker thread active evts#%d\n",
                 hw->stats.n_evt_activeq);

        spin_lock_irq(&hw->lock);
        while (!list_empty(&hw->evt_active_q)) {
                list_splice_tail_init(&hw->evt_active_q, &evt_q);
                spin_unlock_irq(&hw->lock);

                list_for_each_safe(evt_entry, next_entry, &evt_q) {
                        evt_msg = (struct csio_evt_msg *) evt_entry;

                        /* Drop events if queue is STOPPED */
                        spin_lock_irq(&hw->lock);
                        if (hw->flags & CSIO_HWF_FWEVT_STOP)
                                evtq_stop = 1;
                        spin_unlock_irq(&hw->lock);
                        if (evtq_stop) {
                                CSIO_INC_STATS(hw, n_evt_drop);
                                goto free_evt;
                        }

                        switch (evt_msg->type) {
                        case CSIO_EVT_FW:
                                msg = (struct cpl_fw6_msg *)(evt_msg->data);

                                if ((msg->opcode == CPL_FW6_MSG ||
                                     msg->opcode == CPL_FW4_MSG) &&
                                    !msg->type) {
                                        rv = csio_mb_fwevt_handler(hw,
                                                                msg->data);
                                        if (!rv)
                                                break;
                                        /* Handle any remaining fw events */
                                        csio_fcoe_fwevt_handler(hw,
                                                        msg->opcode, msg->data);
                                } else if (msg->opcode == CPL_FW6_PLD) {

                                        csio_fcoe_fwevt_handler(hw,
                                                        msg->opcode, msg->data);
                                } else {
                                        csio_warn(hw,
                                             "Unhandled FW msg op %x type %x\n",
                                                  msg->opcode, msg->type);
                                        CSIO_INC_STATS(hw, n_evt_drop);
                                }
                                break;

                        case CSIO_EVT_MBX:
                                csio_mberr_worker(hw);
                                break;

                        case CSIO_EVT_DEV_LOSS:
                                memcpy(&rn, evt_msg->data, sizeof(rn));
                                csio_rnode_devloss_handler(rn);
                                break;

                        default:
                                csio_warn(hw, "Unhandled event %x on evtq\n",
                                          evt_msg->type);
                                CSIO_INC_STATS(hw, n_evt_unexp);
                                break;
                        }
free_evt:
                        csio_free_evt(hw, evt_msg);
                }

                spin_lock_irq(&hw->lock);
        }
        hw->flags &= ~CSIO_HWF_FWEVT_PENDING;
        spin_unlock_irq(&hw->lock);
}

int
csio_fwevtq_handler(struct csio_hw *hw)
{
        int rv;

        if (csio_q_iqid(hw, hw->fwevt_iq_idx) == CSIO_MAX_QID) {
                CSIO_INC_STATS(hw, n_int_stray);
                return -EINVAL;
        }

        rv = csio_wr_process_iq_idx(hw, hw->fwevt_iq_idx,
                           csio_process_fwevtq_entry, NULL);
        return rv;
}

/****************************************************************************
 * Entry points
 ****************************************************************************/

/* Management module */
/*
 * csio_mgmt_req_lookup - Lookup the given IO req exist in Active Q.
 * mgmt - mgmt module
 * @io_req - io request
 *
 * Return - 0:if given IO Req exists in active Q.
 *          -EINVAL  :if lookup fails.
 */
int
csio_mgmt_req_lookup(struct csio_mgmtm *mgmtm, struct csio_ioreq *io_req)
{
        struct list_head *tmp;

        /* Lookup ioreq in the ACTIVEQ */
        list_for_each(tmp, &mgmtm->active_q) {
                if (io_req == (struct csio_ioreq *)tmp)
                        return 0;
        }
        return -EINVAL;
}

#define ECM_MIN_TMO     1000    /* Minimum timeout value for req */

/*
 * csio_mgmts_tmo_handler - MGMT IO Timeout handler.
 * @data - Event data.
 *
 * Return - none.
 */
static void
csio_mgmt_tmo_handler(uintptr_t data)
{
        struct csio_mgmtm *mgmtm = (struct csio_mgmtm *) data;
        struct list_head *tmp;
        struct csio_ioreq *io_req;

        csio_dbg(mgmtm->hw, "Mgmt timer invoked!\n");

        spin_lock_irq(&mgmtm->hw->lock);

        list_for_each(tmp, &mgmtm->active_q) {
                io_req = (struct csio_ioreq *) tmp;
                io_req->tmo -= min_t(uint32_t, io_req->tmo, ECM_MIN_TMO);

                if (!io_req->tmo) {
                        /* Dequeue the request from retry Q. */
                        tmp = csio_list_prev(tmp);
                        list_del_init(&io_req->sm.sm_list);
                        if (io_req->io_cbfn) {
                                /* io_req will be freed by completion handler */
                                io_req->wr_status = -ETIMEDOUT;
                                io_req->io_cbfn(mgmtm->hw, io_req);
                        } else {
                                CSIO_DB_ASSERT(0);
                        }
                }
        }

        /* If retry queue is not empty, re-arm timer */
        if (!list_empty(&mgmtm->active_q))
                mod_timer(&mgmtm->mgmt_timer,
                          jiffies + msecs_to_jiffies(ECM_MIN_TMO));
        spin_unlock_irq(&mgmtm->hw->lock);
}

static void
csio_mgmtm_cleanup(struct csio_mgmtm *mgmtm)
{
        struct csio_hw *hw = mgmtm->hw;
        struct csio_ioreq *io_req;
        struct list_head *tmp;
        uint32_t count;

        count = 30;
        /* Wait for all outstanding req to complete gracefully */
        while ((!list_empty(&mgmtm->active_q)) && count--) {
                spin_unlock_irq(&hw->lock);
                msleep(2000);
                spin_lock_irq(&hw->lock);
        }

        /* release outstanding req from ACTIVEQ */
        list_for_each(tmp, &mgmtm->active_q) {
                io_req = (struct csio_ioreq *) tmp;
                tmp = csio_list_prev(tmp);
                list_del_init(&io_req->sm.sm_list);
                mgmtm->stats.n_active--;
                if (io_req->io_cbfn) {
                        /* io_req will be freed by completion handler */
                        io_req->wr_status = -ETIMEDOUT;
                        io_req->io_cbfn(mgmtm->hw, io_req);
                }
        }
}

/*
 * csio_mgmt_init - Mgmt module init entry point
 * @mgmtsm - mgmt module
 * @hw   - HW module
 *
 * Initialize mgmt timer, resource wait queue, active queue,
 * completion q. Allocate Egress and Ingress
 * WR queues and save off the queue index returned by the WR
 * module for future use. Allocate and save off mgmt reqs in the
 * mgmt_req_freelist for future use. Make sure their SM is initialized
 * to uninit state.
 * Returns: 0 - on success
 *          -ENOMEM   - on error.
 */
static int
csio_mgmtm_init(struct csio_mgmtm *mgmtm, struct csio_hw *hw)
{
        struct timer_list *timer = &mgmtm->mgmt_timer;

        init_timer(timer);
        timer->function = csio_mgmt_tmo_handler;
        timer->data = (unsigned long)mgmtm;

        INIT_LIST_HEAD(&mgmtm->active_q);
        INIT_LIST_HEAD(&mgmtm->cbfn_q);

        mgmtm->hw = hw;
        /*mgmtm->iq_idx = hw->fwevt_iq_idx;*/

        return 0;
}

/*
 * csio_mgmtm_exit - MGMT module exit entry point
 * @mgmtsm - mgmt module
 *
 * This function called during MGMT module uninit.
 * Stop timers, free ioreqs allocated.
 * Returns: None
 *
 */
static void
csio_mgmtm_exit(struct csio_mgmtm *mgmtm)
{
        del_timer_sync(&mgmtm->mgmt_timer);
}


/**
 * csio_hw_start - Kicks off the HW State machine
 * @hw:         Pointer to HW module.
 *
 * It is assumed that the initialization is a synchronous operation.
 * So when we return afer posting the event, the HW SM should be in
 * the ready state, if there were no errors during init.
 */
int
csio_hw_start(struct csio_hw *hw)
{
        spin_lock_irq(&hw->lock);
        csio_post_event(&hw->sm, CSIO_HWE_CFG);
        spin_unlock_irq(&hw->lock);

        if (csio_is_hw_ready(hw))
                return 0;
        else
                return -EINVAL;
}

int
csio_hw_stop(struct csio_hw *hw)
{
        csio_post_event(&hw->sm, CSIO_HWE_PCI_REMOVE);

        if (csio_is_hw_removing(hw))
                return 0;
        else
                return -EINVAL;
}

/* Max reset retries */
#define CSIO_MAX_RESET_RETRIES  3

/**
 * csio_hw_reset - Reset the hardware
 * @hw:         HW module.
 *
 * Caller should hold lock across this function.
 */
int
csio_hw_reset(struct csio_hw *hw)
{
        if (!csio_is_hw_master(hw))
                return -EPERM;

        if (hw->rst_retries >= CSIO_MAX_RESET_RETRIES) {
                csio_dbg(hw, "Max hw reset attempts reached..");
                return -EINVAL;
        }

        hw->rst_retries++;
        csio_post_event(&hw->sm, CSIO_HWE_HBA_RESET);

        if (csio_is_hw_ready(hw)) {
                hw->rst_retries = 0;
                hw->stats.n_reset_start = jiffies_to_msecs(jiffies);
                return 0;
        } else
                return -EINVAL;
}

/*
 * csio_hw_get_device_id - Caches the Adapter's vendor & device id.
 * @hw: HW module.
 */
static void
csio_hw_get_device_id(struct csio_hw *hw)
{
        /* Is the adapter device id cached already ?*/
        if (csio_is_dev_id_cached(hw))
                return;

        /* Get the PCI vendor & device id */
        pci_read_config_word(hw->pdev, PCI_VENDOR_ID,
                             &hw->params.pci.vendor_id);
        pci_read_config_word(hw->pdev, PCI_DEVICE_ID,
                             &hw->params.pci.device_id);

        csio_dev_id_cached(hw);
        hw->chip_id = (hw->params.pci.device_id & CSIO_HW_CHIP_MASK);

} /* csio_hw_get_device_id */

/*
 * csio_hw_set_description - Set the model, description of the hw.
 * @hw: HW module.
 * @ven_id: PCI Vendor ID
 * @dev_id: PCI Device ID
 */
static void
csio_hw_set_description(struct csio_hw *hw, uint16_t ven_id, uint16_t dev_id)
{
        uint32_t adap_type, prot_type;

        if (ven_id == CSIO_VENDOR_ID) {
                prot_type = (dev_id & CSIO_ASIC_DEVID_PROTO_MASK);
                adap_type = (dev_id & CSIO_ASIC_DEVID_TYPE_MASK);

                if (prot_type == CSIO_T4_FCOE_ASIC) {
                        memcpy(hw->hw_ver,
                               csio_t4_fcoe_adapters[adap_type].model_no, 16);
                        memcpy(hw->model_desc,
                               csio_t4_fcoe_adapters[adap_type].description,
                               32);
                } else if (prot_type == CSIO_T5_FCOE_ASIC) {
                        memcpy(hw->hw_ver,
                               csio_t5_fcoe_adapters[adap_type].model_no, 16);
                        memcpy(hw->model_desc,
                               csio_t5_fcoe_adapters[adap_type].description,
                               32);
                } else {
                        char tempName[32] = "Chelsio FCoE Controller";
                        memcpy(hw->model_desc, tempName, 32);
                }
        }
} /* csio_hw_set_description */

/**
 * csio_hw_init - Initialize HW module.
 * @hw:         Pointer to HW module.
 *
 * Initialize the members of the HW module.
 */
int
csio_hw_init(struct csio_hw *hw)
{
        int rv = -EINVAL;
        uint32_t i;
        uint16_t ven_id, dev_id;
        struct csio_evt_msg     *evt_entry;

        INIT_LIST_HEAD(&hw->sm.sm_list);
        csio_init_state(&hw->sm, csio_hws_uninit);
        spin_lock_init(&hw->lock);
        INIT_LIST_HEAD(&hw->sln_head);

        /* Get the PCI vendor & device id */
        csio_hw_get_device_id(hw);

        strcpy(hw->name, CSIO_HW_NAME);

        /* Initialize the HW chip ops with T4/T5 specific ops */
        hw->chip_ops = csio_is_t4(hw->chip_id) ? &t4_ops : &t5_ops;

        /* Set the model & its description */

        ven_id = hw->params.pci.vendor_id;
        dev_id = hw->params.pci.device_id;

        csio_hw_set_description(hw, ven_id, dev_id);

        /* Initialize default log level */
        hw->params.log_level = (uint32_t) csio_dbg_level;

        csio_set_fwevt_intr_idx(hw, -1);
        csio_set_nondata_intr_idx(hw, -1);

        /* Init all the modules: Mailbox, WorkRequest and Transport */
        if (csio_mbm_init(csio_hw_to_mbm(hw), hw, csio_hw_mb_timer))
                goto err;

        rv = csio_wrm_init(csio_hw_to_wrm(hw), hw);
        if (rv)
                goto err_mbm_exit;

        rv = csio_scsim_init(csio_hw_to_scsim(hw), hw);
        if (rv)
                goto err_wrm_exit;

        rv = csio_mgmtm_init(csio_hw_to_mgmtm(hw), hw);
        if (rv)
                goto err_scsim_exit;
        /* Pre-allocate evtq and initialize them */
        INIT_LIST_HEAD(&hw->evt_active_q);
        INIT_LIST_HEAD(&hw->evt_free_q);
        for (i = 0; i < csio_evtq_sz; i++) {

                evt_entry = kzalloc(sizeof(struct csio_evt_msg), GFP_KERNEL);
                if (!evt_entry) {
                        csio_err(hw, "Failed to initialize eventq");
                        goto err_evtq_cleanup;
                }

                list_add_tail(&evt_entry->list, &hw->evt_free_q);
                CSIO_INC_STATS(hw, n_evt_freeq);
        }

        hw->dev_num = dev_num;
        dev_num++;

        return 0;

err_evtq_cleanup:
        csio_evtq_cleanup(hw);
        csio_mgmtm_exit(csio_hw_to_mgmtm(hw));
err_scsim_exit:
        csio_scsim_exit(csio_hw_to_scsim(hw));
err_wrm_exit:
        csio_wrm_exit(csio_hw_to_wrm(hw), hw);
err_mbm_exit:
        csio_mbm_exit(csio_hw_to_mbm(hw));
err:
        return rv;
}

/**
 * csio_hw_exit - Un-initialize HW module.
 * @hw:         Pointer to HW module.
 *
 */
void
csio_hw_exit(struct csio_hw *hw)
{
        csio_evtq_cleanup(hw);
        csio_mgmtm_exit(csio_hw_to_mgmtm(hw));
        csio_scsim_exit(csio_hw_to_scsim(hw));
        csio_wrm_exit(csio_hw_to_wrm(hw), hw);
        csio_mbm_exit(csio_hw_to_mbm(hw));
}