/******************************************************************************
  SPDX-License-Identifier: BSD-3-Clause

  Copyright (c) 2001-2015, Intel Corporation 
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without 
  modification, are permitted provided that the following conditions are met:
  
   1. Redistributions of source code must retain the above copyright notice, 
      this list of conditions and the following disclaimer.
  
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      notice, this list of conditions and the following disclaimer in the 
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      contributors may be used to endorse or promote products derived from 
      this software without specific prior written permission.
  
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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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******************************************************************************/
/*$FreeBSD$*/


#include "e1000_api.h"


static s32 e1000_init_phy_params_vf(struct e1000_hw *hw);
static s32 e1000_init_nvm_params_vf(struct e1000_hw *hw);
static void e1000_release_vf(struct e1000_hw *hw);
static s32 e1000_acquire_vf(struct e1000_hw *hw);
static s32 e1000_setup_link_vf(struct e1000_hw *hw);
static s32 e1000_get_bus_info_pcie_vf(struct e1000_hw *hw);
static s32 e1000_init_mac_params_vf(struct e1000_hw *hw);
static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
				     u16 *duplex);
static s32 e1000_init_hw_vf(struct e1000_hw *hw);
static s32 e1000_reset_hw_vf(struct e1000_hw *hw);
static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *, u32);
static int  e1000_rar_set_vf(struct e1000_hw *, u8 *, u32);
static s32 e1000_read_mac_addr_vf(struct e1000_hw *);

/**
 *  e1000_init_phy_params_vf - Inits PHY params
 *  @hw: pointer to the HW structure
 *
 *  Doesn't do much - there's no PHY available to the VF.
 **/
static s32 e1000_init_phy_params_vf(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_init_phy_params_vf");
	hw->phy.type = e1000_phy_vf;
	hw->phy.ops.acquire = e1000_acquire_vf;
	hw->phy.ops.release = e1000_release_vf;

	return E1000_SUCCESS;
}

/**
 *  e1000_init_nvm_params_vf - Inits NVM params
 *  @hw: pointer to the HW structure
 *
 *  Doesn't do much - there's no NVM available to the VF.
 **/
static s32 e1000_init_nvm_params_vf(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_init_nvm_params_vf");
	hw->nvm.type = e1000_nvm_none;
	hw->nvm.ops.acquire = e1000_acquire_vf;
	hw->nvm.ops.release = e1000_release_vf;

	return E1000_SUCCESS;
}

/**
 *  e1000_init_mac_params_vf - Inits MAC params
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_init_mac_params_vf(struct e1000_hw *hw)
{
	struct e1000_mac_info *mac = &hw->mac;

	DEBUGFUNC("e1000_init_mac_params_vf");

	/* Set media type */
	/*
	 * Virtual functions don't care what they're media type is as they
	 * have no direct access to the PHY, or the media.  That is handled
	 * by the physical function driver.
	 */
	hw->phy.media_type = e1000_media_type_unknown;

	/* No ASF features for the VF driver */
	mac->asf_firmware_present = FALSE;
	/* ARC subsystem not supported */
	mac->arc_subsystem_valid = FALSE;
	/* Disable adaptive IFS mode so the generic funcs don't do anything */
	mac->adaptive_ifs = FALSE;
	/* VF's have no MTA Registers - PF feature only */
	mac->mta_reg_count = 128;
	/* VF's have no access to RAR entries  */
	mac->rar_entry_count = 1;

	/* Function pointers */
	/* link setup */
	mac->ops.setup_link = e1000_setup_link_vf;
	/* bus type/speed/width */
	mac->ops.get_bus_info = e1000_get_bus_info_pcie_vf;
	/* reset */
	mac->ops.reset_hw = e1000_reset_hw_vf;
	/* hw initialization */
	mac->ops.init_hw = e1000_init_hw_vf;
	/* check for link */
	mac->ops.check_for_link = e1000_check_for_link_vf;
	/* link info */
	mac->ops.get_link_up_info = e1000_get_link_up_info_vf;
	/* multicast address update */
	mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf;
	/* set mac address */
	mac->ops.rar_set = e1000_rar_set_vf;
	/* read mac address */
	mac->ops.read_mac_addr = e1000_read_mac_addr_vf;


	return E1000_SUCCESS;
}

/**
 *  e1000_init_function_pointers_vf - Inits function pointers
 *  @hw: pointer to the HW structure
 **/
void e1000_init_function_pointers_vf(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_init_function_pointers_vf");

	hw->mac.ops.init_params = e1000_init_mac_params_vf;
	hw->nvm.ops.init_params = e1000_init_nvm_params_vf;
	hw->phy.ops.init_params = e1000_init_phy_params_vf;
	hw->mbx.ops.init_params = e1000_init_mbx_params_vf;
}

/**
 *  e1000_acquire_vf - Acquire rights to access PHY or NVM.
 *  @hw: pointer to the HW structure
 *
 *  There is no PHY or NVM so we want all attempts to acquire these to fail.
 *  In addition, the MAC registers to access PHY/NVM don't exist so we don't
 *  even want any SW to attempt to use them.
 **/
static s32 e1000_acquire_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
	return -E1000_ERR_PHY;
}

/**
 *  e1000_release_vf - Release PHY or NVM
 *  @hw: pointer to the HW structure
 *
 *  There is no PHY or NVM so we want all attempts to acquire these to fail.
 *  In addition, the MAC registers to access PHY/NVM don't exist so we don't
 *  even want any SW to attempt to use them.
 **/
static void e1000_release_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
	return;
}

/**
 *  e1000_setup_link_vf - Sets up link.
 *  @hw: pointer to the HW structure
 *
 *  Virtual functions cannot change link.
 **/
static s32 e1000_setup_link_vf(struct e1000_hw E1000_UNUSEDARG *hw)
{
	DEBUGFUNC("e1000_setup_link_vf");

	return E1000_SUCCESS;
}

/**
 *  e1000_get_bus_info_pcie_vf - Gets the bus info.
 *  @hw: pointer to the HW structure
 *
 *  Virtual functions are not really on their own bus.
 **/
static s32 e1000_get_bus_info_pcie_vf(struct e1000_hw *hw)
{
	struct e1000_bus_info *bus = &hw->bus;

	DEBUGFUNC("e1000_get_bus_info_pcie_vf");

	/* Do not set type PCI-E because we don't want disable master to run */
	bus->type = e1000_bus_type_reserved;
	bus->speed = e1000_bus_speed_2500;

	return 0;
}

/**
 *  e1000_get_link_up_info_vf - Gets link info.
 *  @hw: pointer to the HW structure
 *  @speed: pointer to 16 bit value to store link speed.
 *  @duplex: pointer to 16 bit value to store duplex.
 *
 *  Since we cannot read the PHY and get accurate link info, we must rely upon
 *  the status register's data which is often stale and inaccurate.
 **/
static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
				     u16 *duplex)
{
	s32 status;

	DEBUGFUNC("e1000_get_link_up_info_vf");

	status = E1000_READ_REG(hw, E1000_STATUS);
	if (status & E1000_STATUS_SPEED_1000) {
		*speed = SPEED_1000;
		DEBUGOUT("1000 Mbs, ");
	} else if (status & E1000_STATUS_SPEED_100) {
		*speed = SPEED_100;
		DEBUGOUT("100 Mbs, ");
	} else {
		*speed = SPEED_10;
		DEBUGOUT("10 Mbs, ");
	}

	if (status & E1000_STATUS_FD) {
		*duplex = FULL_DUPLEX;
		DEBUGOUT("Full Duplex\n");
	} else {
		*duplex = HALF_DUPLEX;
		DEBUGOUT("Half Duplex\n");
	}

	return E1000_SUCCESS;
}

/**
 *  e1000_reset_hw_vf - Resets the HW
 *  @hw: pointer to the HW structure
 *
 *  VF's provide a function level reset. This is done using bit 26 of ctrl_reg.
 *  This is all the reset we can perform on a VF.
 **/
static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	u32 timeout = E1000_VF_INIT_TIMEOUT;
	s32 ret_val = -E1000_ERR_MAC_INIT;
	u32 ctrl, msgbuf[3];
	u8 *addr = (u8 *)(&msgbuf[1]);

	DEBUGFUNC("e1000_reset_hw_vf");

	DEBUGOUT("Issuing a function level reset to MAC\n");
	ctrl = E1000_READ_REG(hw, E1000_CTRL);
	E1000_WRITE_REG(hw, E1000_CTRL, ctrl | E1000_CTRL_RST);

	/* we cannot reset while the RSTI / RSTD bits are asserted */
	while (!mbx->ops.check_for_rst(hw, 0) && timeout) {
		timeout--;
		usec_delay(5);
	}

	if (timeout) {
		/* mailbox timeout can now become active */
		mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT;

		msgbuf[0] = E1000_VF_RESET;
		mbx->ops.write_posted(hw, msgbuf, 1, 0);

		msec_delay(10);

		/* set our "perm_addr" based on info provided by PF */
		ret_val = mbx->ops.read_posted(hw, msgbuf, 3, 0);
		if (!ret_val) {
			if (msgbuf[0] == (E1000_VF_RESET |
			    E1000_VT_MSGTYPE_ACK))
				memcpy(hw->mac.perm_addr, addr, 6);
			else
				ret_val = -E1000_ERR_MAC_INIT;
		}
	}

	return ret_val;
}

/**
 *  e1000_init_hw_vf - Inits the HW
 *  @hw: pointer to the HW structure
 *
 *  Not much to do here except clear the PF Reset indication if there is one.
 **/
static s32 e1000_init_hw_vf(struct e1000_hw *hw)
{
	DEBUGFUNC("e1000_init_hw_vf");

	/* attempt to set and restore our mac address */
	e1000_rar_set_vf(hw, hw->mac.addr, 0);

	return E1000_SUCCESS;
}

/**
 *  e1000_rar_set_vf - set device MAC address
 *  @hw: pointer to the HW structure
 *  @addr: pointer to the receive address
 *  @index receive address array register
 **/
static int e1000_rar_set_vf(struct e1000_hw *hw, u8 *addr,
			     u32 E1000_UNUSEDARG index)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	u32 msgbuf[3];
	u8 *msg_addr = (u8 *)(&msgbuf[1]);
	s32 ret_val;

	memset(msgbuf, 0, 12);
	msgbuf[0] = E1000_VF_SET_MAC_ADDR;
	memcpy(msg_addr, addr, 6);
	ret_val = mbx->ops.write_posted(hw, msgbuf, 3, 0);

	if (!ret_val)
		ret_val = mbx->ops.read_posted(hw, msgbuf, 3, 0);

	msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;

	/* if nacked the address was rejected, use "perm_addr" */
	if (!ret_val &&
	    (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK)))
		e1000_read_mac_addr_vf(hw);

	return E1000_SUCCESS;
}

/**
 *  e1000_hash_mc_addr_vf - Generate a multicast hash value
 *  @hw: pointer to the HW structure
 *  @mc_addr: pointer to a multicast address
 *
 *  Generates a multicast address hash value which is used to determine
 *  the multicast filter table array address and new table value.
 **/
static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr)
{
	u32 hash_value, hash_mask;
	u8 bit_shift = 0;

	DEBUGFUNC("e1000_hash_mc_addr_generic");

	/* Register count multiplied by bits per register */
	hash_mask = (hw->mac.mta_reg_count * 32) - 1;

	/*
	 * The bit_shift is the number of left-shifts
	 * where 0xFF would still fall within the hash mask.
	 */
	while (hash_mask >> bit_shift != 0xFF)
		bit_shift++;

	hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
				  (((u16) mc_addr[5]) << bit_shift)));

	return hash_value;
}

static void e1000_write_msg_read_ack(struct e1000_hw *hw,
				     u32 *msg, u16 size)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	u32 retmsg[E1000_VFMAILBOX_SIZE];
	s32 retval = mbx->ops.write_posted(hw, msg, size, 0);

	if (!retval)
		mbx->ops.read_posted(hw, retmsg, E1000_VFMAILBOX_SIZE, 0);
}

/**
 *  e1000_update_mc_addr_list_vf - Update Multicast addresses
 *  @hw: pointer to the HW structure
 *  @mc_addr_list: array of multicast addresses to program
 *  @mc_addr_count: number of multicast addresses to program
 *
 *  Updates the Multicast Table Array.
 *  The caller must have a packed mc_addr_list of multicast addresses.
 **/
void e1000_update_mc_addr_list_vf(struct e1000_hw *hw,
				  u8 *mc_addr_list, u32 mc_addr_count)
{
	u32 msgbuf[E1000_VFMAILBOX_SIZE];
	u16 *hash_list = (u16 *)&msgbuf[1];
	u32 hash_value;
	u32 i;

	DEBUGFUNC("e1000_update_mc_addr_list_vf");

	/* Each entry in the list uses 1 16 bit word.  We have 30
	 * 16 bit words available in our HW msg buffer (minus 1 for the
	 * msg type).  That's 30 hash values if we pack 'em right.  If
	 * there are more than 30 MC addresses to add then punt the
	 * extras for now and then add code to handle more than 30 later.
	 * It would be unusual for a server to request that many multi-cast
	 * addresses except for in large enterprise network environments.
	 */

	DEBUGOUT1("MC Addr Count = %d\n", mc_addr_count);

	if (mc_addr_count > 30) {
		msgbuf[0] |= E1000_VF_SET_MULTICAST_OVERFLOW;
		mc_addr_count = 30;
	}

	msgbuf[0] = E1000_VF_SET_MULTICAST;
	msgbuf[0] |= mc_addr_count << E1000_VT_MSGINFO_SHIFT;

	for (i = 0; i < mc_addr_count; i++) {
		hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list);
		DEBUGOUT1("Hash value = 0x%03X\n", hash_value);
		hash_list[i] = hash_value & 0x0FFF;
		mc_addr_list += ETH_ADDR_LEN;
	}

	e1000_write_msg_read_ack(hw, msgbuf, E1000_VFMAILBOX_SIZE);
}

/**
 *  e1000_vfta_set_vf - Set/Unset vlan filter table address
 *  @hw: pointer to the HW structure
 *  @vid: determines the vfta register and bit to set/unset
 *  @set: if TRUE then set bit, else clear bit
 **/
void e1000_vfta_set_vf(struct e1000_hw *hw, u16 vid, bool set)
{
	u32 msgbuf[2];

	msgbuf[0] = E1000_VF_SET_VLAN;
	msgbuf[1] = vid;
	/* Setting the 8 bit field MSG INFO to TRUE indicates "add" */
	if (set)
		msgbuf[0] |= E1000_VF_SET_VLAN_ADD;

	e1000_write_msg_read_ack(hw, msgbuf, 2);
}

/** e1000_rlpml_set_vf - Set the maximum receive packet length
 *  @hw: pointer to the HW structure
 *  @max_size: value to assign to max frame size
 **/
void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
{
	u32 msgbuf[2];

	msgbuf[0] = E1000_VF_SET_LPE;
	msgbuf[1] = max_size;

	e1000_write_msg_read_ack(hw, msgbuf, 2);
}

/**
 *  e1000_promisc_set_vf - Set flags for Unicast or Multicast promisc
 *  @hw: pointer to the HW structure
 *  @uni: boolean indicating unicast promisc status
 *  @multi: boolean indicating multicast promisc status
 **/
s32 e1000_promisc_set_vf(struct e1000_hw *hw, enum e1000_promisc_type type)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	u32 msgbuf = E1000_VF_SET_PROMISC;
	s32 ret_val;

	switch (type) {
	case e1000_promisc_multicast:
		msgbuf |= E1000_VF_SET_PROMISC_MULTICAST;
		break;
	case e1000_promisc_enabled:
		msgbuf |= E1000_VF_SET_PROMISC_MULTICAST;
		/* FALLTHROUGH */
	case e1000_promisc_unicast:
		msgbuf |= E1000_VF_SET_PROMISC_UNICAST;
		/* FALLTHROUGH */
	case e1000_promisc_disabled:
		break;
	default:
		return -E1000_ERR_MAC_INIT;
	}

	 ret_val = mbx->ops.write_posted(hw, &msgbuf, 1, 0);

	if (!ret_val)
		ret_val = mbx->ops.read_posted(hw, &msgbuf, 1, 0);

	if (!ret_val && !(msgbuf & E1000_VT_MSGTYPE_ACK))
		ret_val = -E1000_ERR_MAC_INIT;

	return ret_val;
}

/**
 *  e1000_read_mac_addr_vf - Read device MAC address
 *  @hw: pointer to the HW structure
 **/
static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw)
{
	int i;

	for (i = 0; i < ETH_ADDR_LEN; i++)
		hw->mac.addr[i] = hw->mac.perm_addr[i];

	return E1000_SUCCESS;
}

/**
 *  e1000_check_for_link_vf - Check for link for a virtual interface
 *  @hw: pointer to the HW structure
 *
 *  Checks to see if the underlying PF is still talking to the VF and
 *  if it is then it reports the link state to the hardware, otherwise
 *  it reports link down and returns an error.
 **/
static s32 e1000_check_for_link_vf(struct e1000_hw *hw)
{
	struct e1000_mbx_info *mbx = &hw->mbx;
	struct e1000_mac_info *mac = &hw->mac;
	s32 ret_val = E1000_SUCCESS;
	u32 in_msg = 0;

	DEBUGFUNC("e1000_check_for_link_vf");

	/*
	 * We only want to run this if there has been a rst asserted.
	 * in this case that could mean a link change, device reset,
	 * or a virtual function reset
	 */

	/* If we were hit with a reset or timeout drop the link */
	if (!mbx->ops.check_for_rst(hw, 0) || !mbx->timeout)
		mac->get_link_status = TRUE;

	if (!mac->get_link_status)
		goto out;

	/* if link status is down no point in checking to see if pf is up */
	if (!(E1000_READ_REG(hw, E1000_STATUS) & E1000_STATUS_LU))
		goto out;

	/* if the read failed it could just be a mailbox collision, best wait
	 * until we are called again and don't report an error */
	if (mbx->ops.read(hw, &in_msg, 1, 0))
		goto out;

	/* if incoming message isn't clear to send we are waiting on response */
	if (!(in_msg & E1000_VT_MSGTYPE_CTS)) {
		/* message is not CTS and is NACK we have lost CTS status */
		if (in_msg & E1000_VT_MSGTYPE_NACK)
			ret_val = -E1000_ERR_MAC_INIT;
		goto out;
	}

	/* at this point we know the PF is talking to us, check and see if
	 * we are still accepting timeout or if we had a timeout failure.
	 * if we failed then we will need to reinit */
	if (!mbx->timeout) {
		ret_val = -E1000_ERR_MAC_INIT;
		goto out;
	}

	/* if we passed all the tests above then the link is up and we no
	 * longer need to check for link */
	mac->get_link_status = FALSE;

out:
	return ret_val;
}