// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Driver for Microsemi VSC85xx PHYs - MACsec support
*
* Author: Antoine Tenart
* License: Dual MIT/GPL
* Copyright (c) 2020 Microsemi Corporation
*/
#include <linux/phy.h>
#include <dt-bindings/net/mscc-phy-vsc8531.h>
#include <crypto/aes.h>
#include <net/macsec.h>
#include "mscc.h"
#include "mscc_mac.h"
#include "mscc_macsec.h"
#include "mscc_fc_buffer.h"
static u32 vsc8584_macsec_phy_read(struct phy_device *phydev,
enum macsec_bank bank, u32 reg)
{
u32 val, val_l = 0, val_h = 0;
unsigned long deadline;
int rc;
rc = phy_select_page(phydev, MSCC_PHY_PAGE_MACSEC);
if (rc < 0)
goto failed;
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_20,
MSCC_PHY_MACSEC_20_TARGET(bank >> 2));
if (bank >> 2 == 0x1)
/* non-MACsec access */
bank &= 0x3;
else
bank = 0;
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_19,
MSCC_PHY_MACSEC_19_CMD | MSCC_PHY_MACSEC_19_READ |
MSCC_PHY_MACSEC_19_REG_ADDR(reg) |
MSCC_PHY_MACSEC_19_TARGET(bank));
deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
do {
val = __phy_read(phydev, MSCC_EXT_PAGE_MACSEC_19);
} while (time_before(jiffies, deadline) && !(val & MSCC_PHY_MACSEC_19_CMD));
val_l = __phy_read(phydev, MSCC_EXT_PAGE_MACSEC_17);
val_h = __phy_read(phydev, MSCC_EXT_PAGE_MACSEC_18);
failed:
phy_restore_page(phydev, rc, rc);
return (val_h << 16) | val_l;
}
static void vsc8584_macsec_phy_write(struct phy_device *phydev,
enum macsec_bank bank, u32 reg, u32 val)
{
unsigned long deadline;
int rc;
rc = phy_select_page(phydev, MSCC_PHY_PAGE_MACSEC);
if (rc < 0)
goto failed;
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_20,
MSCC_PHY_MACSEC_20_TARGET(bank >> 2));
if ((bank >> 2 == 0x1) || (bank >> 2 == 0x3))
bank &= 0x3;
else
/* MACsec access */
bank = 0;
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_17, (u16)val);
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_18, (u16)(val >> 16));
__phy_write(phydev, MSCC_EXT_PAGE_MACSEC_19,
MSCC_PHY_MACSEC_19_CMD | MSCC_PHY_MACSEC_19_REG_ADDR(reg) |
MSCC_PHY_MACSEC_19_TARGET(bank));
deadline = jiffies + msecs_to_jiffies(PROC_CMD_NCOMPLETED_TIMEOUT_MS);
do {
val = __phy_read(phydev, MSCC_EXT_PAGE_MACSEC_19);
} while (time_before(jiffies, deadline) && !(val & MSCC_PHY_MACSEC_19_CMD));
failed:
phy_restore_page(phydev, rc, rc);
}
static void vsc8584_macsec_classification(struct phy_device *phydev,
enum macsec_bank bank)
{
/* enable VLAN tag parsing */
vsc8584_macsec_phy_write(phydev, bank, MSCC_MS_SAM_CP_TAG,
MSCC_MS_SAM_CP_TAG_PARSE_STAG |
MSCC_MS_SAM_CP_TAG_PARSE_QTAG |
MSCC_MS_SAM_CP_TAG_PARSE_QINQ);
}
static void vsc8584_macsec_flow_default_action(struct phy_device *phydev,
enum macsec_bank bank,
bool block)
{
u32 port = (bank == MACSEC_INGR) ?
MSCC_MS_PORT_UNCONTROLLED : MSCC_MS_PORT_COMMON;
u32 action = MSCC_MS_FLOW_BYPASS;
if (block)
action = MSCC_MS_FLOW_DROP;
vsc8584_macsec_phy_write(phydev, bank, MSCC_MS_SAM_NM_FLOW_NCP,
/* MACsec untagged */
MSCC_MS_SAM_NM_FLOW_NCP_UNTAGGED_FLOW_TYPE(action) |
MSCC_MS_SAM_NM_FLOW_NCP_UNTAGGED_DROP_ACTION(MSCC_MS_ACTION_DROP) |
MSCC_MS_SAM_NM_FLOW_NCP_UNTAGGED_DEST_PORT(port) |
/* MACsec tagged */
MSCC_MS_SAM_NM_FLOW_NCP_TAGGED_FLOW_TYPE(action) |
MSCC_MS_SAM_NM_FLOW_NCP_TAGGED_DROP_ACTION(MSCC_MS_ACTION_DROP) |
MSCC_MS_SAM_NM_FLOW_NCP_TAGGED_DEST_PORT(port) |
/* Bad tag */
MSCC_MS_SAM_NM_FLOW_NCP_BADTAG_FLOW_TYPE(action) |
MSCC_MS_SAM_NM_FLOW_NCP_BADTAG_DROP_ACTION(MSCC_MS_ACTION_DROP) |