/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2016 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include <linux/pci.h>
#include <linux/delay.h>
#include "ixgbe.h"
#include "ixgbe_mbx.h"

/**
 *  ixgbe_read_mbx - Reads a message from the mailbox
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @mbx_id: id of mailbox to read
 *
 *  returns SUCCESS if it successfully read message from buffer
 **/
s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        /* limit read to size of mailbox */
        if (size > mbx->size)
                size = mbx->size;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        return mbx->ops->read(hw, msg, size, mbx_id);
}

/**
 *  ixgbe_write_mbx - Write a message to the mailbox
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @mbx_id: id of mailbox to write
 *
 *  returns SUCCESS if it successfully copied message into the buffer
 **/
s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        if (size > mbx->size)
                return IXGBE_ERR_MBX;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        return mbx->ops->write(hw, msg, size, mbx_id);
}

/**
 *  ixgbe_check_for_msg - checks to see if someone sent us mail
 *  @hw: pointer to the HW structure
 *  @mbx_id: id of mailbox to check
 *
 *  returns SUCCESS if the Status bit was found or else ERR_MBX
 **/
s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        return mbx->ops->check_for_msg(hw, mbx_id);
}

/**
 *  ixgbe_check_for_ack - checks to see if someone sent us ACK
 *  @hw: pointer to the HW structure
 *  @mbx_id: id of mailbox to check
 *
 *  returns SUCCESS if the Status bit was found or else ERR_MBX
 **/
s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        return mbx->ops->check_for_ack(hw, mbx_id);
}

/**
 *  ixgbe_check_for_rst - checks to see if other side has reset
 *  @hw: pointer to the HW structure
 *  @mbx_id: id of mailbox to check
 *
 *  returns SUCCESS if the Status bit was found or else ERR_MBX
 **/
s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        return mbx->ops->check_for_rst(hw, mbx_id);
}

/**
 *  ixgbe_poll_for_msg - Wait for message notification
 *  @hw: pointer to the HW structure
 *  @mbx_id: id of mailbox to write
 *
 *  returns SUCCESS if it successfully received a message notification
 **/
static s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        int countdown = mbx->timeout;

        if (!countdown || !mbx->ops)
                return IXGBE_ERR_MBX;

        while (mbx->ops->check_for_msg(hw, mbx_id)) {
                countdown--;
                if (!countdown)
                        return IXGBE_ERR_MBX;
                udelay(mbx->usec_delay);
        }

        return 0;
}

/**
 *  ixgbe_poll_for_ack - Wait for message acknowledgement
 *  @hw: pointer to the HW structure
 *  @mbx_id: id of mailbox to write
 *
 *  returns SUCCESS if it successfully received a message acknowledgement
 **/
static s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        int countdown = mbx->timeout;

        if (!countdown || !mbx->ops)
                return IXGBE_ERR_MBX;

        while (mbx->ops->check_for_ack(hw, mbx_id)) {
                countdown--;
                if (!countdown)
                        return IXGBE_ERR_MBX;
                udelay(mbx->usec_delay);
        }

        return 0;
}

/**
 *  ixgbe_read_posted_mbx - Wait for message notification and receive message
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @mbx_id: id of mailbox to write
 *
 *  returns SUCCESS if it successfully received a message notification and
 *  copied it into the receive buffer.
 **/
static s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                 u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        s32 ret_val;

        if (!mbx->ops)
                return IXGBE_ERR_MBX;

        ret_val = ixgbe_poll_for_msg(hw, mbx_id);
        if (ret_val)
                return ret_val;

        /* if ack received read message */
        return mbx->ops->read(hw, msg, size, mbx_id);
}

/**
 *  ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @mbx_id: id of mailbox to write
 *
 *  returns SUCCESS if it successfully copied message into the buffer and
 *  received an ack to that message within delay * timeout period
 **/
static s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
                           u16 mbx_id)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;
        s32 ret_val;

        /* exit if either we can't write or there isn't a defined timeout */
        if (!mbx->ops || !mbx->timeout)
                return IXGBE_ERR_MBX;

        /* send msg */
        ret_val = mbx->ops->write(hw, msg, size, mbx_id);
        if (ret_val)
                return ret_val;

        /* if msg sent wait until we receive an ack */
        return ixgbe_poll_for_ack(hw, mbx_id);
}

static s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)
{
        u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));

        if (mbvficr & mask) {
                IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);
                return 0;
        }

        return IXGBE_ERR_MBX;
}

/**
 *  ixgbe_check_for_msg_pf - checks to see if the VF has sent mail
 *  @hw: pointer to the HW structure
 *  @vf_number: the VF index
 *
 *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 **/
static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
{
        s32 index = IXGBE_MBVFICR_INDEX(vf_number);
        u32 vf_bit = vf_number % 16;

        if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,
                                    index)) {
                hw->mbx.stats.reqs++;
                return 0;
        }

        return IXGBE_ERR_MBX;
}

/**
 *  ixgbe_check_for_ack_pf - checks to see if the VF has ACKed
 *  @hw: pointer to the HW structure
 *  @vf_number: the VF index
 *
 *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 **/
static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
{
        s32 index = IXGBE_MBVFICR_INDEX(vf_number);
        u32 vf_bit = vf_number % 16;

        if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,
                                    index)) {
                hw->mbx.stats.acks++;
                return 0;
        }

        return IXGBE_ERR_MBX;
}

/**
 *  ixgbe_check_for_rst_pf - checks to see if the VF has reset
 *  @hw: pointer to the HW structure
 *  @vf_number: the VF index
 *
 *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 **/
static s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)
{
        u32 reg_offset = (vf_number < 32) ? 0 : 1;
        u32 vf_shift = vf_number % 32;
        u32 vflre = 0;

        switch (hw->mac.type) {
        case ixgbe_mac_82599EB:
                vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));
                break;
        case ixgbe_mac_X540:
        case ixgbe_mac_X550:
        case ixgbe_mac_X550EM_x:
        case ixgbe_mac_x550em_a:
                vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));
                break;
        default:
                break;
        }

        if (vflre & BIT(vf_shift)) {
                IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), BIT(vf_shift));
                hw->mbx.stats.rsts++;
                return 0;
        }

        return IXGBE_ERR_MBX;
}

/**
 *  ixgbe_obtain_mbx_lock_pf - obtain mailbox lock
 *  @hw: pointer to the HW structure
 *  @vf_number: the VF index
 *
 *  return SUCCESS if we obtained the mailbox lock
 **/
static s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)
{
        u32 p2v_mailbox;

        /* Take ownership of the buffer */
        IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);

        /* reserve mailbox for vf use */
        p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));
        if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)
                return 0;

        return IXGBE_ERR_MBX;
}

/**
 *  ixgbe_write_mbx_pf - Places a message in the mailbox
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @vf_number: the VF index
 *
 *  returns SUCCESS if it successfully copied message into the buffer
 **/
static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                              u16 vf_number)
{
        s32 ret_val;
        u16 i;

        /* lock the mailbox to prevent pf/vf race condition */
        ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
        if (ret_val)
                return ret_val;

        /* flush msg and acks as we are overwriting the message buffer */
        ixgbe_check_for_msg_pf(hw, vf_number);
        ixgbe_check_for_ack_pf(hw, vf_number);

        /* copy the caller specified message to the mailbox memory buffer */
        for (i = 0; i < size; i++)
                IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);

        /* Interrupt VF to tell it a message has been sent and release buffer*/
        IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);

        /* update stats */
        hw->mbx.stats.msgs_tx++;

        return 0;
}

/**
 *  ixgbe_read_mbx_pf - Read a message from the mailbox
 *  @hw: pointer to the HW structure
 *  @msg: The message buffer
 *  @size: Length of buffer
 *  @vf_number: the VF index
 *
 *  This function copies a message from the mailbox buffer to the caller's
 *  memory buffer.  The presumption is that the caller knows that there was
 *  a message due to a VF request so no polling for message is needed.
 **/
static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                             u16 vf_number)
{
        s32 ret_val;
        u16 i;

        /* lock the mailbox to prevent pf/vf race condition */
        ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
        if (ret_val)
                return ret_val;

        /* copy the message to the mailbox memory buffer */
        for (i = 0; i < size; i++)
                msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);

        /* Acknowledge the message and release buffer */
        IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);

        /* update stats */
        hw->mbx.stats.msgs_rx++;

        return 0;
}

#ifdef CONFIG_PCI_IOV
/**
 *  ixgbe_init_mbx_params_pf - set initial values for pf mailbox
 *  @hw: pointer to the HW structure
 *
 *  Initializes the hw->mbx struct to correct values for pf mailbox
 */
void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
{
        struct ixgbe_mbx_info *mbx = &hw->mbx;

        if (hw->mac.type != ixgbe_mac_82599EB &&
            hw->mac.type != ixgbe_mac_X550 &&
            hw->mac.type != ixgbe_mac_X550EM_x &&
            hw->mac.type != ixgbe_mac_x550em_a &&
            hw->mac.type != ixgbe_mac_X540)
                return;

        mbx->timeout = 0;
        mbx->usec_delay = 0;

        mbx->stats.msgs_tx = 0;
        mbx->stats.msgs_rx = 0;
        mbx->stats.reqs = 0;
        mbx->stats.acks = 0;
        mbx->stats.rsts = 0;

        mbx->size = IXGBE_VFMAILBOX_SIZE;
}
#endif /* CONFIG_PCI_IOV */

const struct ixgbe_mbx_operations mbx_ops_generic = {
        .read                   = ixgbe_read_mbx_pf,
        .write                  = ixgbe_write_mbx_pf,
        .read_posted            = ixgbe_read_posted_mbx,
        .write_posted           = ixgbe_write_posted_mbx,
        .check_for_msg          = ixgbe_check_for_msg_pf,
        .check_for_ack          = ixgbe_check_for_ack_pf,
        .check_for_rst          = ixgbe_check_for_rst_pf,
};