linux/drivers/net/ksz884x.c

/**
 * drivers/net/ksx884x.c - Micrel KSZ8841/2 PCI Ethernet driver
 *
 * Copyright (c) 2009-2010 Micrel, Inc.
 * 	Tristram Ha <Tristram.Ha@micrel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/mii.h>
#include <linux/platform_device.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/sched.h>
#include <linux/slab.h>


/* DMA Registers */

#define KS_DMA_TX_CTRL			0x0000
#define DMA_TX_ENABLE			0x00000001
#define DMA_TX_CRC_ENABLE		0x00000002
#define DMA_TX_PAD_ENABLE		0x00000004
#define DMA_TX_LOOPBACK			0x00000100
#define DMA_TX_FLOW_ENABLE		0x00000200
#define DMA_TX_CSUM_IP			0x00010000
#define DMA_TX_CSUM_TCP			0x00020000
#define DMA_TX_CSUM_UDP			0x00040000
#define DMA_TX_BURST_SIZE		0x3F000000

#define KS_DMA_RX_CTRL			0x0004
#define DMA_RX_ENABLE			0x00000001
#define KS884X_DMA_RX_MULTICAST		0x00000002
#define DMA_RX_PROMISCUOUS		0x00000004
#define DMA_RX_ERROR			0x00000008
#define DMA_RX_UNICAST			0x00000010
#define DMA_RX_ALL_MULTICAST		0x00000020
#define DMA_RX_BROADCAST		0x00000040
#define DMA_RX_FLOW_ENABLE		0x00000200
#define DMA_RX_CSUM_IP			0x00010000
#define DMA_RX_CSUM_TCP			0x00020000
#define DMA_RX_CSUM_UDP			0x00040000
#define DMA_RX_BURST_SIZE		0x3F000000

#define DMA_BURST_SHIFT			24
#define DMA_BURST_DEFAULT		8

#define KS_DMA_TX_START			0x0008
#define KS_DMA_RX_START			0x000C
#define DMA_START			0x00000001

#define KS_DMA_TX_ADDR			0x0010
#define KS_DMA_RX_ADDR			0x0014

#define DMA_ADDR_LIST_MASK		0xFFFFFFFC
#define DMA_ADDR_LIST_SHIFT		2

/* MTR0 */
#define KS884X_MULTICAST_0_OFFSET	0x0020
#define KS884X_MULTICAST_1_OFFSET	0x0021
#define KS884X_MULTICAST_2_OFFSET	0x0022
#define KS884x_MULTICAST_3_OFFSET	0x0023
/* MTR1 */
#define KS884X_MULTICAST_4_OFFSET	0x0024
#define KS884X_MULTICAST_5_OFFSET	0x0025
#define KS884X_MULTICAST_6_OFFSET	0x0026
#define KS884X_MULTICAST_7_OFFSET	0x0027

/* Interrupt Registers */

/* INTEN */
#define KS884X_INTERRUPTS_ENABLE	0x0028
/* INTST */
#define KS884X_INTERRUPTS_STATUS	0x002C

#define KS884X_INT_RX_STOPPED		0x02000000
#define KS884X_INT_TX_STOPPED		0x04000000
#define KS884X_INT_RX_OVERRUN		0x08000000
#define KS884X_INT_TX_EMPTY		0x10000000
#define KS884X_INT_RX			0x20000000
#define KS884X_INT_TX			0x40000000
#define KS884X_INT_PHY			0x80000000

#define KS884X_INT_RX_MASK		\
	(KS884X_INT_RX | KS884X_INT_RX_OVERRUN)
#define KS884X_INT_TX_MASK		\
	(KS884X_INT_TX | KS884X_INT_TX_EMPTY)
#define KS884X_INT_MASK	(KS884X_INT_RX | KS884X_INT_TX | KS884X_INT_PHY)

/* MAC Additional Station Address */

/* MAAL0 */
#define KS_ADD_ADDR_0_LO		0x0080
/* MAAH0 */
#define KS_ADD_ADDR_0_HI		0x0084
/* MAAL1 */
#define KS_ADD_ADDR_1_LO		0x0088
/* MAAH1 */
#define KS_ADD_ADDR_1_HI		0x008C
/* MAAL2 */
#define KS_ADD_ADDR_2_LO		0x0090
/* MAAH2 */
#define KS_ADD_ADDR_2_HI		0x0094
/* MAAL3 */
#define KS_ADD_ADDR_3_LO		0x0098
/* MAAH3 */
#define KS_ADD_ADDR_3_HI		0x009C
/* MAAL4 */
#define KS_ADD_ADDR_4_LO		0x00A0
/* MAAH4 */
#define KS_ADD_ADDR_4_HI		0x00A4
/* MAAL5 */
#define KS_ADD_ADDR_5_LO		0x00A8
/* MAAH5 */
#define KS_ADD_ADDR_5_HI		0x00AC
/* MAAL6 */
#define KS_ADD_ADDR_6_LO		0x00B0
/* MAAH6 */
#define KS_ADD_ADDR_6_HI		0x00B4
/* MAAL7 */
#define KS_ADD_ADDR_7_LO		0x00B8
/* MAAH7 */
#define KS_ADD_ADDR_7_HI		0x00BC
/* MAAL8 */
#define KS_ADD_ADDR_8_LO		0x00C0
/* MAAH8 */
#define KS_ADD_ADDR_8_HI		0x00C4
/* MAAL9 */
#define KS_ADD_ADDR_9_LO		0x00C8
/* MAAH9 */
#define KS_ADD_ADDR_9_HI		0x00CC
/* MAAL10 */
#define KS_ADD_ADDR_A_LO		0x00D0
/* MAAH10 */
#define KS_ADD_ADDR_A_HI		0x00D4
/* MAAL11 */
#define KS_ADD_ADDR_B_LO		0x00D8
/* MAAH11 */
#define KS_ADD_ADDR_B_HI		0x00DC
/* MAAL12 */
#define KS_ADD_ADDR_C_LO		0x00E0
/* MAAH12 */
#define KS_ADD_ADDR_C_HI		0x00E4
/* MAAL13 */
#define KS_ADD_ADDR_D_LO		0x00E8
/* MAAH13 */
#define KS_ADD_ADDR_D_HI		0x00EC
/* MAAL14 */
#define KS_ADD_ADDR_E_LO		0x00F0
/* MAAH14 */
#define KS_ADD_ADDR_E_HI		0x00F4
/* MAAL15 */
#define KS_ADD_ADDR_F_LO		0x00F8
/* MAAH15 */
#define KS_ADD_ADDR_F_HI		0x00FC

#define ADD_ADDR_HI_MASK		0x0000FFFF
#define ADD_ADDR_ENABLE			0x80000000
#define ADD_ADDR_INCR			8

/* Miscellaneous Registers */

/* MARL */
#define KS884X_ADDR_0_OFFSET		0x0200
#define KS884X_ADDR_1_OFFSET		0x0201
/* MARM */
#define KS884X_ADDR_2_OFFSET		0x0202
#define KS884X_ADDR_3_OFFSET		0x0203
/* MARH */
#define KS884X_ADDR_4_OFFSET		0x0204
#define KS884X_ADDR_5_OFFSET		0x0205

/* OBCR */
#define KS884X_BUS_CTRL_OFFSET		0x0210

#define BUS_SPEED_125_MHZ		0x0000
#define BUS_SPEED_62_5_MHZ		0x0001
#define BUS_SPEED_41_66_MHZ		0x0002
#define BUS_SPEED_25_MHZ		0x0003

/* EEPCR */
#define KS884X_EEPROM_CTRL_OFFSET	0x0212

#define EEPROM_CHIP_SELECT		0x0001
#define EEPROM_SERIAL_CLOCK		0x0002
#define EEPROM_DATA_OUT			0x0004
#define EEPROM_DATA_IN			0x0008
#define EEPROM_ACCESS_ENABLE		0x0010

/* MBIR */
#define KS884X_MEM_INFO_OFFSET		0x0214

#define RX_MEM_TEST_FAILED		0x0008
#define RX_MEM_TEST_FINISHED		0x0010
#define TX_MEM_TEST_FAILED		0x0800
#define TX_MEM_TEST_FINISHED		0x1000

/* GCR */
#define KS884X_GLOBAL_CTRL_OFFSET	0x0216
#define GLOBAL_SOFTWARE_RESET		0x0001

#define KS8841_POWER_MANAGE_OFFSET	0x0218

/* WFCR */
#define KS8841_WOL_CTRL_OFFSET		0x021A
#define KS8841_WOL_MAGIC_ENABLE		0x0080
#define KS8841_WOL_FRAME3_ENABLE	0x0008
#define KS8841_WOL_FRAME2_ENABLE	0x0004
#define KS8841_WOL_FRAME1_ENABLE	0x0002
#define KS8841_WOL_FRAME0_ENABLE	0x0001

/* WF0 */
#define KS8841_WOL_FRAME_CRC_OFFSET	0x0220
#define KS8841_WOL_FRAME_BYTE0_OFFSET	0x0224
#define KS8841_WOL_FRAME_BYTE2_OFFSET	0x0228

/* IACR */
#define KS884X_IACR_P			0x04A0
#define KS884X_IACR_OFFSET		KS884X_IACR_P

/* IADR1 */
#define KS884X_IADR1_P			0x04A2
#define KS884X_IADR2_P			0x04A4
#define KS884X_IADR3_P			0x04A6
#define KS884X_IADR4_P			0x04A8
#define KS884X_IADR5_P			0x04AA

#define KS884X_ACC_CTRL_SEL_OFFSET	KS884X_IACR_P
#define KS884X_ACC_CTRL_INDEX_OFFSET	(KS884X_ACC_CTRL_SEL_OFFSET + 1)

#define KS884X_ACC_DATA_0_OFFSET	KS884X_IADR4_P
#define KS884X_ACC_DATA_1_OFFSET	(KS884X_ACC_DATA_0_OFFSET + 1)
#define KS884X_ACC_DATA_2_OFFSET	KS884X_IADR5_P
#define KS884X_ACC_DATA_3_OFFSET	(KS884X_ACC_DATA_2_OFFSET + 1)
#define KS884X_ACC_DATA_4_OFFSET	KS884X_IADR2_P
#define KS884X_ACC_DATA_5_OFFSET	(KS884X_ACC_DATA_4_OFFSET + 1)
#define KS884X_ACC_DATA_6_OFFSET	KS884X_IADR3_P
#define KS884X_ACC_DATA_7_OFFSET	(KS884X_ACC_DATA_6_OFFSET + 1)
#define KS884X_ACC_DATA_8_OFFSET	KS884X_IADR1_P

/* P1MBCR */
#define KS884X_P1MBCR_P			0x04D0
#define KS884X_P1MBSR_P			0x04D2
#define KS884X_PHY1ILR_P		0x04D4
#define KS884X_PHY1IHR_P		0x04D6
#define KS884X_P1ANAR_P			0x04D8
#define KS884X_P1ANLPR_P		0x04DA

/* P2MBCR */
#define KS884X_P2MBCR_P			0x04E0
#define KS884X_P2MBSR_P			0x04E2
#define KS884X_PHY2ILR_P		0x04E4
#define KS884X_PHY2IHR_P		0x04E6
#define KS884X_P2ANAR_P			0x04E8
#define KS884X_P2ANLPR_P		0x04EA

#define KS884X_PHY_1_CTRL_OFFSET	KS884X_P1MBCR_P
#define PHY_CTRL_INTERVAL		(KS884X_P2MBCR_P - KS884X_P1MBCR_P)

#define KS884X_PHY_CTRL_OFFSET		0x00

/* Mode Control Register */
#define PHY_REG_CTRL			0

#define PHY_RESET			0x8000
#define PHY_LOOPBACK			0x4000
#define PHY_SPEED_100MBIT		0x2000
#define PHY_AUTO_NEG_ENABLE		0x1000
#define PHY_POWER_DOWN			0x0800
#define PHY_MII_DISABLE			0x0400
#define PHY_AUTO_NEG_RESTART		0x0200
#define PHY_FULL_DUPLEX			0x0100
#define PHY_COLLISION_TEST		0x0080
#define PHY_HP_MDIX			0x0020
#define PHY_FORCE_MDIX			0x0010
#define PHY_AUTO_MDIX_DISABLE		0x0008
#define PHY_REMOTE_FAULT_DISABLE	0x0004
#define PHY_TRANSMIT_DISABLE		0x0002
#define PHY_LED_DISABLE			0x0001

#define KS884X_PHY_STATUS_OFFSET	0x02

/* Mode Status Register */
#define PHY_REG_STATUS			1

#define PHY_100BT4_CAPABLE		0x8000
#define PHY_100BTX_FD_CAPABLE		0x4000
#define PHY_100BTX_CAPABLE		0x2000
#define PHY_10BT_FD_CAPABLE		0x1000
#define PHY_10BT_CAPABLE		0x0800
#define PHY_MII_SUPPRESS_CAPABLE	0x0040
#define PHY_AUTO_NEG_ACKNOWLEDGE	0x0020
#define PHY_REMOTE_FAULT		0x0010
#define PHY_AUTO_NEG_CAPABLE		0x0008
#define PHY_LINK_STATUS			0x0004
#define PHY_JABBER_DETECT		0x0002
#define PHY_EXTENDED_CAPABILITY		0x0001

#define KS884X_PHY_ID_1_OFFSET		0x04
#define KS884X_PHY_ID_2_OFFSET		0x06

/* PHY Identifier Registers */
#define PHY_REG_ID_1			2
#define PHY_REG_ID_2			3

#define KS884X_PHY_AUTO_NEG_OFFSET	0x08

/* Auto-Negotiation Advertisement Register */
#define PHY_REG_AUTO_NEGOTIATION	4

#define PHY_AUTO_NEG_NEXT_PAGE		0x8000
#define PHY_AUTO_NEG_REMOTE_FAULT	0x2000
/* Not supported. */
#define PHY_AUTO_NEG_ASYM_PAUSE		0x0800
#define PHY_AUTO_NEG_SYM_PAUSE		0x0400
#define PHY_AUTO_NEG_100BT4		0x0200
#define PHY_AUTO_NEG_100BTX_FD		0x0100
#define PHY_AUTO_NEG_100BTX		0x0080
#define PHY_AUTO_NEG_10BT_FD		0x0040
#define PHY_AUTO_NEG_10BT		0x0020
#define PHY_AUTO_NEG_SELECTOR		0x001F
#define PHY_AUTO_NEG_802_3		0x0001

#define PHY_AUTO_NEG_PAUSE  (PHY_AUTO_NEG_SYM_PAUSE | PHY_AUTO_NEG_ASYM_PAUSE)

#define KS884X_PHY_REMOTE_CAP_OFFSET	0x0A

/* Auto-Negotiation Link Partner Ability Register */
#define PHY_REG_REMOTE_CAPABILITY	5

#define PHY_REMOTE_NEXT_PAGE		0x8000
#define PHY_REMOTE_ACKNOWLEDGE		0x4000
#define PHY_REMOTE_REMOTE_FAULT		0x2000
#define PHY_REMOTE_SYM_PAUSE		0x0400
#define PHY_REMOTE_100BTX_FD		0x0100
#define PHY_REMOTE_100BTX		0x0080
#define PHY_REMOTE_10BT_FD		0x0040
#define PHY_REMOTE_10BT			0x0020

/* P1VCT */
#define KS884X_P1VCT_P			0x04F0
#define KS884X_P1PHYCTRL_P		0x04F2

/* P2VCT */
#define KS884X_P2VCT_P			0x04F4
#define KS884X_P2PHYCTRL_P		0x04F6

#define KS884X_PHY_SPECIAL_OFFSET	KS884X_P1VCT_P
#define PHY_SPECIAL_INTERVAL		(KS884X_P2VCT_P - KS884X_P1VCT_P)

#define KS884X_PHY_LINK_MD_OFFSET	0x00

#define PHY_START_CABLE_DIAG		0x8000
#define PHY_CABLE_DIAG_RESULT		0x6000
#define PHY_CABLE_STAT_NORMAL		0x0000
#define PHY_CABLE_STAT_OPEN		0x2000
#define PHY_CABLE_STAT_SHORT		0x4000
#define PHY_CABLE_STAT_FAILED		0x6000
#define PHY_CABLE_10M_SHORT		0x1000
#define PHY_CABLE_FAULT_COUNTER		0x01FF

#define KS884X_PHY_PHY_CTRL_OFFSET	0x02

#define PHY_STAT_REVERSED_POLARITY	0x0020
#define PHY_STAT_MDIX			0x0010
#define PHY_FORCE_LINK			0x0008
#define PHY_POWER_SAVING_DISABLE	0x0004
#define PHY_REMOTE_LOOPBACK		0x0002

/* SIDER */
#define KS884X_SIDER_P			0x0400
#define KS884X_CHIP_ID_OFFSET		KS884X_SIDER_P
#define KS884X_FAMILY_ID_OFFSET		(KS884X_CHIP_ID_OFFSET + 1)

#define REG_FAMILY_ID			0x88

#define REG_CHIP_ID_41			0x8810
#define REG_CHIP_ID_42			0x8800

#define KS884X_CHIP_ID_MASK_41		0xFF10
#define KS884X_CHIP_ID_MASK		0xFFF0
#define KS884X_CHIP_ID_SHIFT		4
#define KS884X_REVISION_MASK		0x000E
#define KS884X_REVISION_SHIFT		1
#define KS8842_START			0x0001

#define CHIP_IP_41_M			0x8810
#define CHIP_IP_42_M			0x8800
#define CHIP_IP_61_M			0x8890
#define CHIP_IP_62_M			0x8880

#define CHIP_IP_41_P			0x8850
#define CHIP_IP_42_P			0x8840
#define CHIP_IP_61_P			0x88D0
#define CHIP_IP_62_P			0x88C0

/* SGCR1 */
#define KS8842_SGCR1_P			0x0402
#define KS8842_SWITCH_CTRL_1_OFFSET	KS8842_SGCR1_P

#define SWITCH_PASS_ALL			0x8000
#define SWITCH_TX_FLOW_CTRL		0x2000
#define SWITCH_RX_FLOW_CTRL		0x1000
#define SWITCH_CHECK_LENGTH		0x0800
#define SWITCH_AGING_ENABLE		0x0400
#define SWITCH_FAST_AGING		0x0200
#define SWITCH_AGGR_BACKOFF		0x0100
#define SWITCH_PASS_PAUSE		0x0008
#define SWITCH_LINK_AUTO_AGING		0x0001

/* SGCR2 */
#define KS8842_SGCR2_P			0x0404
#define KS8842_SWITCH_CTRL_2_OFFSET	KS8842_SGCR2_P

#define SWITCH_VLAN_ENABLE		0x8000
#define SWITCH_IGMP_SNOOP		0x4000
#define IPV6_MLD_SNOOP_ENABLE		0x2000
#define IPV6_MLD_SNOOP_OPTION		0x1000
#define PRIORITY_SCHEME_SELECT		0x0800
#define SWITCH_MIRROR_RX_TX		0x0100
#define UNICAST_VLAN_BOUNDARY		0x0080
#define MULTICAST_STORM_DISABLE		0x0040
#define SWITCH_BACK_PRESSURE		0x0020
#define FAIR_FLOW_CTRL			0x0010
#define NO_EXC_COLLISION_DROP		0x0008
#define SWITCH_HUGE_PACKET		0x0004
#define SWITCH_LEGAL_PACKET		0x0002
#define SWITCH_BUF_RESERVE		0x0001

/* SGCR3 */
#define KS8842_SGCR3_P			0x0406
#define KS8842_SWITCH_CTRL_3_OFFSET	KS8842_SGCR3_P

#define BROADCAST_STORM_RATE_LO		0xFF00
#define SWITCH_REPEATER			0x0080
#define SWITCH_HALF_DUPLEX		0x0040
#define SWITCH_FLOW_CTRL		0x0020
#define SWITCH_10_MBIT			0x0010
#define SWITCH_REPLACE_NULL_VID		0x0008
#define BROADCAST_STORM_RATE_HI		0x0007

#define BROADCAST_STORM_RATE		0x07FF

/* SGCR4 */
#define KS8842_SGCR4_P			0x0408

/* SGCR5 */
#define KS8842_SGCR5_P			0x040A
#define KS8842_SWITCH_CTRL_5_OFFSET	KS8842_SGCR5_P

#define LED_MODE			0x8200
#define LED_SPEED_DUPLEX_ACT		0x0000
#define LED_SPEED_DUPLEX_LINK_ACT	0x8000
#define LED_DUPLEX_10_100		0x0200

/* SGCR6 */
#define KS8842_SGCR6_P			0x0410
#define KS8842_SWITCH_CTRL_6_OFFSET	KS8842_SGCR6_P

#define KS8842_PRIORITY_MASK		3
#define KS8842_PRIORITY_SHIFT		2

/* SGCR7 */
#define KS8842_SGCR7_P			0x0412
#define KS8842_SWITCH_CTRL_7_OFFSET	KS8842_SGCR7_P

#define SWITCH_UNK_DEF_PORT_ENABLE	0x0008
#define SWITCH_UNK_DEF_PORT_3		0x0004
#define SWITCH_UNK_DEF_PORT_2		0x0002
#define SWITCH_UNK_DEF_PORT_1		0x0001

/* MACAR1 */
#define KS8842_MACAR1_P			0x0470
#define KS8842_MACAR2_P			0x0472
#define KS8842_MACAR3_P			0x0474
#define KS8842_MAC_ADDR_1_OFFSET	KS8842_MACAR1_P
#define KS8842_MAC_ADDR_0_OFFSET	(KS8842_MAC_ADDR_1_OFFSET + 1)
#define KS8842_MAC_ADDR_3_OFFSET	KS8842_MACAR2_P
#define KS8842_MAC_ADDR_2_OFFSET	(KS8842_MAC_ADDR_3_OFFSET + 1)
#define KS8842_MAC_ADDR_5_OFFSET	KS8842_MACAR3_P
#define KS8842_MAC_ADDR_4_OFFSET	(KS8842_MAC_ADDR_5_OFFSET + 1)

/* TOSR1 */
#define KS8842_TOSR1_P			0x0480
#define KS8842_TOSR2_P			0x0482
#define KS8842_TOSR3_P			0x0484
#define KS8842_TOSR4_P			0x0486
#define KS8842_TOSR5_P			0x0488
#define KS8842_TOSR6_P			0x048A
#define KS8842_TOSR7_P			0x0490
#define KS8842_TOSR8_P			0x0492
#define KS8842_TOS_1_OFFSET		KS8842_TOSR1_P
#define KS8842_TOS_2_OFFSET		KS8842_TOSR2_P
#define KS8842_TOS_3_OFFSET		KS8842_TOSR3_P
#define KS8842_TOS_4_OFFSET		KS8842_TOSR4_P
#define KS8842_TOS_5_OFFSET		KS8842_TOSR5_P
#define KS8842_TOS_6_OFFSET		KS8842_TOSR6_P

#define KS8842_TOS_7_OFFSET		KS8842_TOSR7_P
#define KS8842_TOS_8_OFFSET		KS8842_TOSR8_P

/* P1CR1 */
#define KS8842_P1CR1_P			0x0500
#define KS8842_P1CR2_P			0x0502
#define KS8842_P1VIDR_P			0x0504
#define KS8842_P1CR3_P			0x0506
#define KS8842_P1IRCR_P			0x0508
#define KS8842_P1ERCR_P			0x050A
#define KS884X_P1SCSLMD_P		0x0510
#define KS884X_P1CR4_P			0x0512
#define KS884X_P1SR_P			0x0514

/* P2CR1 */
#define KS8842_P2CR1_P			0x0520
#define KS8842_P2CR2_P			0x0522
#define KS8842_P2VIDR_P			0x0524
#define KS8842_P2CR3_P			0x0526
#define KS8842_P2IRCR_P			0x0528
#define KS8842_P2ERCR_P			0x052A
#define KS884X_P2SCSLMD_P		0x0530
#define KS884X_P2CR4_P			0x0532
#define KS884X_P2SR_P			0x0534

/* P3CR1 */
#define KS8842_P3CR1_P			0x0540
#define KS8842_P3CR2_P			0x0542
#define KS8842_P3VIDR_P			0x0544
#define KS8842_P3CR3_P			0x0546
#define KS8842_P3IRCR_P			0x0548
#define KS8842_P3ERCR_P			0x054A

#define KS8842_PORT_1_CTRL_1		KS8842_P1CR1_P
#define KS8842_PORT_2_CTRL_1		KS8842_P2CR1_P
#define KS8842_PORT_3_CTRL_1		KS8842_P3CR1_P

#define PORT_CTRL_ADDR(port, addr)		\
	(addr = KS8842_PORT_1_CTRL_1 + (port) *	\
		(KS8842_PORT_2_CTRL_1 - KS8842_PORT_1_CTRL_1))

#define KS8842_PORT_CTRL_1_OFFSET	0x00

#define PORT_BROADCAST_STORM		0x0080
#define PORT_DIFFSERV_ENABLE		0x0040
#define PORT_802_1P_ENABLE		0x0020
#define PORT_BASED_PRIORITY_MASK	0x0018
#define PORT_BASED_PRIORITY_BASE	0x0003
#define PORT_BASED_PRIORITY_SHIFT	3
#define PORT_BASED_PRIORITY_0		0x0000
#define PORT_BASED_PRIORITY_1		0x0008
#define PORT_BASED_PRIORITY_2		0x0010
#define PORT_BASED_PRIORITY_3		0x0018
#define PORT_INSERT_TAG			0x0004
#define PORT_REMOVE_TAG			0x0002
#define PORT_PRIO_QUEUE_ENABLE		0x0001

#define KS8842_PORT_CTRL_2_OFFSET	0x02

#define PORT_INGRESS_VLAN_FILTER	0x4000
#define PORT_DISCARD_NON_VID		0x2000
#define PORT_FORCE_FLOW_CTRL		0x1000
#define PORT_BACK_PRESSURE		0x0800
#define PORT_TX_ENABLE			0x0400
#define PORT_RX_ENABLE			0x0200
#define PORT_LEARN_DISABLE		0x0100
#define PORT_MIRROR_SNIFFER		0x0080
#define PORT_MIRROR_RX			0x0040
#define PORT_MIRROR_TX			0x0020
#define PORT_USER_PRIORITY_CEILING	0x0008
#define PORT_VLAN_MEMBERSHIP		0x0007

#define KS8842_PORT_CTRL_VID_OFFSET	0x04

#define PORT_DEFAULT_VID		0x0001

#define KS8842_PORT_CTRL_3_OFFSET	0x06

#define PORT_INGRESS_LIMIT_MODE		0x000C
#define PORT_INGRESS_ALL		0x0000
#define PORT_INGRESS_UNICAST		0x0004
#define PORT_INGRESS_MULTICAST		0x0008
#define PORT_INGRESS_BROADCAST		0x000C
#define PORT_COUNT_IFG			0x0002
#define PORT_COUNT_PREAMBLE		0x0001

#define KS8842_PORT_IN_RATE_OFFSET	0x08
#define KS8842_PORT_OUT_RATE_OFFSET	0x0A

#define PORT_PRIORITY_RATE		0x0F
#define PORT_PRIORITY_RATE_SHIFT	4

#define KS884X_PORT_LINK_MD		0x10

#define PORT_CABLE_10M_SHORT		0x8000
#define PORT_CABLE_DIAG_RESULT		0x6000
#define PORT_CABLE_STAT_NORMAL		0x0000
#define PORT_CABLE_STAT_OPEN		0x2000
#define PORT_CABLE_STAT_SHORT		0x4000
#define PORT_CABLE_STAT_FAILED		0x6000
#define PORT_START_CABLE_DIAG		0x1000
#define PORT_FORCE_LINK			0x0800
#define PORT_POWER_SAVING_DISABLE	0x0400
#define PORT_PHY_REMOTE_LOOPBACK	0x0200
#define PORT_CABLE_FAULT_COUNTER	0x01FF

#define KS884X_PORT_CTRL_4_OFFSET	0x12

#define PORT_LED_OFF			0x8000
#define PORT_TX_DISABLE			0x4000
#define PORT_AUTO_NEG_RESTART		0x2000
#define PORT_REMOTE_FAULT_DISABLE	0x1000
#define PORT_POWER_DOWN			0x0800
#define PORT_AUTO_MDIX_DISABLE		0x0400
#define PORT_FORCE_MDIX			0x0200
#define PORT_LOOPBACK			0x0100
#define PORT_AUTO_NEG_ENABLE		0x0080
#define PORT_FORCE_100_MBIT		0x0040
#define PORT_FORCE_FULL_DUPLEX		0x0020
#define PORT_AUTO_NEG_SYM_PAUSE		0x0010
#define PORT_AUTO_NEG_100BTX_FD		0x0008
#define PORT_AUTO_NEG_100BTX		0x0004
#define PORT_AUTO_NEG_10BT_FD		0x0002
#define PORT_AUTO_NEG_10BT		0x0001

#define KS884X_PORT_STATUS_OFFSET	0x14

#define PORT_HP_MDIX			0x8000
#define PORT_REVERSED_POLARITY		0x2000
#define PORT_RX_FLOW_CTRL		0x0800
#define PORT_TX_FLOW_CTRL		0x1000
#define PORT_STATUS_SPEED_100MBIT	0x0400
#define PORT_STATUS_FULL_DUPLEX		0x0200
#define PORT_REMOTE_FAULT		0x0100
#define PORT_MDIX_STATUS		0x0080
#define PORT_AUTO_NEG_COMPLETE		0x0040
#define PORT_STATUS_LINK_GOOD		0x0020
#define PORT_REMOTE_SYM_PAUSE		0x0010
#define PORT_REMOTE_100BTX_FD		0x0008
#define PORT_REMOTE_100BTX		0x0004
#define PORT_REMOTE_10BT_FD		0x0002
#define PORT_REMOTE_10BT		0x0001

/*
#define STATIC_MAC_TABLE_ADDR		00-0000FFFF-FFFFFFFF
#define STATIC_MAC_TABLE_FWD_PORTS	00-00070000-00000000
#define STATIC_MAC_TABLE_VALID		00-00080000-00000000
#define STATIC_MAC_TABLE_OVERRIDE	00-00100000-00000000
#define STATIC_MAC_TABLE_USE_FID	00-00200000-00000000
#define STATIC_MAC_TABLE_FID		00-03C00000-00000000
*/

#define STATIC_MAC_TABLE_ADDR		0x0000FFFF
#define STATIC_MAC_TABLE_FWD_PORTS	0x00070000
#define STATIC_MAC_TABLE_VALID		0x00080000
#define STATIC_MAC_TABLE_OVERRIDE	0x00100000
#define STATIC_MAC_TABLE_USE_FID	0x00200000
#define STATIC_MAC_TABLE_FID		0x03C00000

#define STATIC_MAC_FWD_PORTS_SHIFT	16
#define STATIC_MAC_FID_SHIFT		22

/*
#define VLAN_TABLE_VID			00-00000000-00000FFF
#define VLAN_TABLE_FID			00-00000000-0000F000
#define VLAN_TABLE_MEMBERSHIP		00-00000000-00070000
#define VLAN_TABLE_VALID		00-00000000-00080000
*/

#define VLAN_TABLE_VID			0x00000FFF
#define VLAN_TABLE_FID			0x0000F000
#define VLAN_TABLE_MEMBERSHIP		0x00070000
#define VLAN_TABLE_VALID		0x00080000

#define VLAN_TABLE_FID_SHIFT		12
#define VLAN_TABLE_MEMBERSHIP_SHIFT	16

/*
#define DYNAMIC_MAC_TABLE_ADDR		00-0000FFFF-FFFFFFFF
#define DYNAMIC_MAC_TABLE_FID		00-000F0000-00000000
#define DYNAMIC_MAC_TABLE_SRC_PORT	00-00300000-00000000
#define DYNAMIC_MAC_TABLE_TIMESTAMP	00-00C00000-00000000
#define DYNAMIC_MAC_TABLE_ENTRIES	03-FF000000-00000000
#define DYNAMIC_MAC_TABLE_MAC_EMPTY	04-00000000-00000000
#define DYNAMIC_MAC_TABLE_RESERVED	78-00000000-00000000
#define DYNAMIC_MAC_TABLE_NOT_READY	80-00000000-00000000
*/

#define DYNAMIC_MAC_TABLE_ADDR		0x0000FFFF
#define DYNAMIC_MAC_TABLE_FID		0x000F0000
#define DYNAMIC_MAC_TABLE_SRC_PORT	0x00300000
#define DYNAMIC_MAC_TABLE_TIMESTAMP	0x00C00000
#define DYNAMIC_MAC_TABLE_ENTRIES	0xFF000000

#define DYNAMIC_MAC_TABLE_ENTRIES_H	0x03
#define DYNAMIC_MAC_TABLE_MAC_EMPTY	0x04
#define DYNAMIC_MAC_TABLE_RESERVED	0x78
#define DYNAMIC_MAC_TABLE_NOT_READY	0x80

#define DYNAMIC_MAC_FID_SHIFT		16
#define DYNAMIC_MAC_SRC_PORT_SHIFT	20
#define DYNAMIC_MAC_TIMESTAMP_SHIFT	22
#define DYNAMIC_MAC_ENTRIES_SHIFT	24
#define DYNAMIC_MAC_ENTRIES_H_SHIFT	8

/*
#define MIB_COUNTER_VALUE		00-00000000-3FFFFFFF
#define MIB_COUNTER_VALID		00-00000000-40000000
#define MIB_COUNTER_OVERFLOW		00-00000000-80000000
*/

#define MIB_COUNTER_VALUE		0x3FFFFFFF
#define MIB_COUNTER_VALID		0x40000000
#define MIB_COUNTER_OVERFLOW		0x80000000

#define MIB_PACKET_DROPPED		0x0000FFFF

#define KS_MIB_PACKET_DROPPED_TX_0	0x100
#define KS_MIB_PACKET_DROPPED_TX_1	0x101
#define KS_MIB_PACKET_DROPPED_TX	0x102
#define KS_MIB_PACKET_DROPPED_RX_0	0x103
#define KS_MIB_PACKET_DROPPED_RX_1	0x104
#define KS_MIB_PACKET_DROPPED_RX	0x105

/* Change default LED mode. */
#define SET_DEFAULT_LED			LED_SPEED_DUPLEX_ACT

#define MAC_ADDR_LEN			6
#define MAC_ADDR_ORDER(i)		(MAC_ADDR_LEN - 1 - (i))

#define MAX_ETHERNET_BODY_SIZE		1500
#define ETHERNET_HEADER_SIZE		14

#define MAX_ETHERNET_PACKET_SIZE	\
	(MAX_ETHERNET_BODY_SIZE + ETHERNET_HEADER_SIZE)

#define REGULAR_RX_BUF_SIZE		(MAX_ETHERNET_PACKET_SIZE + 4)
#define MAX_RX_BUF_SIZE			(1912 + 4)

#define ADDITIONAL_ENTRIES		16
#define MAX_MULTICAST_LIST		32

#define HW_MULTICAST_SIZE		8

#define HW_TO_DEV_PORT(port)		(port - 1)

enum {
	media_connected,
	media_disconnected
};

enum {
	OID_COUNTER_UNKOWN,

	OID_COUNTER_FIRST,

	/* total transmit errors */
	OID_COUNTER_XMIT_ERROR,

	/* total receive errors */
	OID_COUNTER_RCV_ERROR,

	OID_COUNTER_LAST
};

/*
 * Hardware descriptor definitions
 */

#define DESC_ALIGNMENT			16
#define BUFFER_ALIGNMENT		8

#define NUM_OF_RX_DESC			64
#define NUM_OF_TX_DESC			64

#define KS_DESC_RX_FRAME_LEN		0x000007FF
#define KS_DESC_RX_FRAME_TYPE		0x00008000
#define KS_DESC_RX_ERROR_CRC		0x00010000
#define KS_DESC_RX_ERROR_RUNT		0x00020000
#define KS_DESC_RX_ERROR_TOO_LONG	0x00040000
#define KS_DESC_RX_ERROR_PHY		0x00080000
#define KS884X_DESC_RX_PORT_MASK	0x00300000
#define KS_DESC_RX_MULTICAST		0x01000000
#define KS_DESC_RX_ERROR		0x02000000
#define KS_DESC_RX_ERROR_CSUM_UDP	0x04000000
#define KS_DESC_RX_ERROR_CSUM_TCP	0x08000000
#define KS_DESC_RX_ERROR_CSUM_IP	0x10000000
#define KS_DESC_RX_LAST			0x20000000
#define KS_DESC_RX_FIRST		0x40000000
#define KS_DESC_RX_ERROR_COND		\
	(KS_DESC_RX_ERROR_CRC |		\
	KS_DESC_RX_ERROR_RUNT |		\
	KS_DESC_RX_ERROR_PHY |		\
	KS_DESC_RX_ERROR_TOO_LONG)

#define KS_DESC_HW_OWNED		0x80000000

#define KS_DESC_BUF_SIZE		0x000007FF
#define KS884X_DESC_TX_PORT_MASK	0x00300000
#define KS_DESC_END_OF_RING		0x02000000
#define KS_DESC_TX_CSUM_GEN_UDP		0x04000000
#define KS_DESC_TX_CSUM_GEN_TCP		0x08000000
#define KS_DESC_TX_CSUM_GEN_IP		0x10000000
#define KS_DESC_TX_LAST			0x20000000
#define KS_DESC_TX_FIRST		0x40000000
#define KS_DESC_TX_INTERRUPT		0x80000000

#define KS_DESC_PORT_SHIFT		20

#define KS_DESC_RX_MASK			(KS_DESC_BUF_SIZE)

#define KS_DESC_TX_MASK			\
	(KS_DESC_TX_INTERRUPT |		\
	KS_DESC_TX_FIRST |		\
	KS_DESC_TX_LAST |		\
	KS_DESC_TX_CSUM_GEN_IP |	\
	KS_DESC_TX_CSUM_GEN_TCP |	\
	KS_DESC_TX_CSUM_GEN_UDP |	\
	KS_DESC_BUF_SIZE)

struct ksz_desc_rx_stat {
#ifdef __BIG_ENDIAN_BITFIELD
	u32 hw_owned:1;
	u32 first_desc:1;
	u32 last_desc:1;
	u32 csum_err_ip:1;
	u32 csum_err_tcp:1;
	u32 csum_err_udp:1;
	u32 error:1;
	u32 multicast:1;
	u32 src_port:4;
	u32 err_phy:1;
	u32 err_too_long:1;
	u32 err_runt:1;
	u32 err_crc:1;
	u32 frame_type:1;
	u32 reserved1:4;
	u32 frame_len:11;
#else
	u32 frame_len:11;
	u32 reserved1:4;
	u32 frame_type:1;
	u32 err_crc:1;
	u32 err_runt:1;
	u32 err_too_long:1;
	u32 err_phy:1;
	u32 src_port:4;
	u32 multicast:1;
	u32 error:1;
	u32 csum_err_udp:1;
	u32 csum_err_tcp:1;
	u32 csum_err_ip:1;
	u32 last_desc:1;
	u32 first_desc:1;
	u32 hw_owned:1;
#endif
};

struct ksz_desc_tx_stat {
#ifdef __BIG_ENDIAN_BITFIELD
	u32 hw_owned:1;
	u32 reserved1:31;
#else
	u32 reserved1:31;
	u32 hw_owned:1;
#endif
};

struct ksz_desc_rx_buf {
#ifdef __BIG_ENDIAN_BITFIELD
	u32 reserved4:6;
	u32 end_of_ring:1;
	u32 reserved3:14;
	u32 buf_size:11;
#else
	u32 buf_size:11;
	u32 reserved3:14;
	u32 end_of_ring:1;
	u32 reserved4:6;
#endif
};

struct ksz_desc_tx_buf {
#ifdef __BIG_ENDIAN_BITFIELD
	u32 intr:1;
	u32 first_seg:1;
	u32 last_seg:1;
	u32 csum_gen_ip:1;
	u32 csum_gen_tcp:1;
	u32 csum_gen_udp:1;
	u32 end_of_ring:1;
	u32 reserved4:1;
	u32 dest_port:4;
	u32 reserved3:9;
	u32 buf_size:11;
#else
	u32 buf_size:11;
	u32 reserved3:9;
	u32 dest_port:4;
	u32 reserved4:1;
	u32 end_of_ring:1;
	u32 csum_gen_udp:1;
	u32 csum_gen_tcp:1;
	u32 csum_gen_ip:1;
	u32 last_seg:1;
	u32 first_seg:1;
	u32 intr:1;
#endif
};

union desc_stat {
	struct ksz_desc_rx_stat rx;
	struct ksz_desc_tx_stat tx;
	u32 data;
};

union desc_buf {
	struct ksz_desc_rx_buf rx;
	struct ksz_desc_tx_buf tx;
	u32 data;
};

/**
 * struct ksz_hw_desc - Hardware descriptor data structure
 * @ctrl:	Descriptor control value.
 * @buf:	Descriptor buffer value.
 * @addr:	Physical address of memory buffer.
 * @next:	Pointer to next hardware descriptor.
 */
struct ksz_hw_desc {
	union desc_stat ctrl;
	union desc_buf buf;
	u32 addr;
	u32 next;
};

/**
 * struct ksz_sw_desc - Software descriptor data structure
 * @ctrl:	Descriptor control value.
 * @buf:	Descriptor buffer value.
 * @buf_size:	Current buffers size value in hardware descriptor.
 */
struct ksz_sw_desc {
	union desc_stat ctrl;
	union desc_buf buf;
	u32 buf_size;
};

/**
 * struct ksz_dma_buf - OS dependent DMA buffer data structure
 * @skb:	Associated socket buffer.
 * @dma:	Associated physical DMA address.
 * len:		Actual len used.
 */
struct ksz_dma_buf {
	struct sk_buff *skb;
	dma_addr_t dma;
	int len;
};

/**
 * struct ksz_desc - Descriptor structure
 * @phw:	Hardware descriptor pointer to uncached physical memory.
 * @sw:		Cached memory to hold hardware descriptor values for
 * 		manipulation.
 * @dma_buf:	Operating system dependent data structure to hold physical
 * 		memory buffer allocation information.
 */
struct ksz_desc {
	struct ksz_hw_desc *phw;
	struct ksz_sw_desc sw;
	struct ksz_dma_buf dma_buf;
};

#define DMA_BUFFER(desc)  ((struct ksz_dma_buf *)(&(desc)->dma_buf))

/**
 * struct ksz_desc_info - Descriptor information data structure
 * @ring:	First descriptor in the ring.
 * @cur:	Current descriptor being manipulated.
 * @ring_virt:	First hardware descriptor in the ring.
 * @ring_phys:	The physical address of the first descriptor of the ring.
 * @size:	Size of hardware descriptor.
 * @alloc:	Number of descriptors allocated.
 * @avail:	Number of descriptors available for use.
 * @last:	Index for last descriptor released to hardware.
 * @next:	Index for next descriptor available for use.
 * @mask:	Mask for index wrapping.
 */
struct ksz_desc_info {
	struct ksz_desc *ring;
	struct ksz_desc *cur;
	struct ksz_hw_desc *ring_virt;
	u32 ring_phys;
	int size;
	int alloc;
	int avail;
	int last;
	int next;
	int mask;
};

/*
 * KSZ8842 switch definitions
 */

enum {
	TABLE_STATIC_MAC = 0,
	TABLE_VLAN,
	TABLE_DYNAMIC_MAC,
	TABLE_MIB
};

#define LEARNED_MAC_TABLE_ENTRIES	1024
#define STATIC_MAC_TABLE_ENTRIES	8

/**
 * struct ksz_mac_table - Static MAC table data structure
 * @mac_addr:	MAC address to filter.
 * @vid:	VID value.
 * @fid:	FID value.
 * @ports:	Port membership.
 * @override:	Override setting.
 * @use_fid:	FID use setting.
 * @valid:	Valid setting indicating the entry is being used.
 */
struct ksz_mac_table {
	u8 mac_addr[MAC_ADDR_LEN];
	u16 vid;
	u8 fid;
	u8 ports;
	u8 override:1;
	u8 use_fid:1;
	u8 valid:1;
};

#define VLAN_TABLE_ENTRIES		16

/**
 * struct ksz_vlan_table - VLAN table data structure
 * @vid:	VID value.
 * @fid:	FID value.
 * @member:	Port membership.
 */
struct ksz_vlan_table {
	u16 vid;
	u8 fid;
	u8 member;
};

#define DIFFSERV_ENTRIES		64
#define PRIO_802_1P_ENTRIES		8
#define PRIO_QUEUES			4

#define SWITCH_PORT_NUM			2
#define TOTAL_PORT_NUM			(SWITCH_PORT_NUM + 1)
#define HOST_MASK			(1 << SWITCH_PORT_NUM)
#define PORT_MASK			7

#define MAIN_PORT			0
#define OTHER_PORT			1
#define HOST_PORT			SWITCH_PORT_NUM

#define PORT_COUNTER_NUM		0x20
#define TOTAL_PORT_COUNTER_NUM		(PORT_COUNTER_NUM + 2)

#define MIB_COUNTER_RX_LO_PRIORITY	0x00
#define MIB_COUNTER_RX_HI_PRIORITY	0x01
#define MIB_COUNTER_RX_UNDERSIZE	0x02
#define MIB_COUNTER_RX_FRAGMENT		0x03
#define MIB_COUNTER_RX_OVERSIZE		0x04
#define MIB_COUNTER_RX_JABBER		0x05
#define MIB_COUNTER_RX_SYMBOL_ERR	0x06
#define MIB_COUNTER_RX_CRC_ERR		0x07
#define MIB_COUNTER_RX_ALIGNMENT_ERR	0x08
#define MIB_COUNTER_RX_CTRL_8808	0x09
#define MIB_COUNTER_RX_PAUSE		0x0A
#define MIB_COUNTER_RX_BROADCAST	0x0B
#define MIB_COUNTER_RX_MULTICAST	0x0C
#define MIB_COUNTER_RX_UNICAST		0x0D
#define MIB_COUNTER_RX_OCTET_64		0x0E
#define MIB_COUNTER_RX_OCTET_65_127	0x0F
#define MIB_COUNTER_RX_OCTET_128_255	0x10
#define MIB_COUNTER_RX_OCTET_256_511	0x11
#define MIB_COUNTER_RX_OCTET_512_1023	0x12
#define MIB_COUNTER_RX_OCTET_1024_1522	0x13
#define MIB_COUNTER_TX_LO_PRIORITY	0x14
#define MIB_COUNTER_TX_HI_PRIORITY	0x15
#define MIB_COUNTER_TX_LATE_COLLISION	0x16
#define MIB_COUNTER_TX_PAUSE		0x17
#define MIB_COUNTER_TX_BROADCAST	0x18
#define MIB_COUNTER_TX_MULTICAST	0x19
#define MIB_COUNTER_TX_UNICAST		0x1A
#define MIB_COUNTER_TX_DEFERRED		0x1B
#define MIB_COUNTER_TX_TOTAL_COLLISION	0x1C
#define MIB_COUNTER_TX_EXCESS_COLLISION	0x1D
#define MIB_COUNTER_TX_SINGLE_COLLISION	0x1E
#define MIB_COUNTER_TX_MULTI_COLLISION	0x1F

#define MIB_COUNTER_RX_DROPPED_PACKET	0x20
#define MIB_COUNTER_TX_DROPPED_PACKET	0x21

/**
 * struct ksz_port_mib - Port MIB data structure
 * @cnt_ptr:	Current pointer to MIB counter index.
 * @link_down:	Indication the link has just gone down.
 * @state:	Connection status of the port.
 * @mib_start:	The starting counter index.  Some ports do not start at 0.
 * @counter:	64-bit MIB counter value.
 * @dropped:	Temporary buffer to remember last read packet dropped values.
 *
 * MIB counters needs to be read periodically so that counters do not get
 * overflowed and give incorrect values.  A right balance is needed to
 * satisfy this condition and not waste too much CPU time.
 *
 * It is pointless to read MIB counters when the port is disconnected.  The
 * @state provides the connection status so that MIB counters are read only
 * when the port is connected.  The @link_down indicates the port is just
 * disconnected so that all MIB counters are read one last time to update the
 * information.
 */
struct ksz_port_mib {
	u8 cnt_ptr;
	u8 link_down;
	u8 state;
	u8 mib_start;

	u64 counter[TOTAL_PORT_COUNTER_NUM];
	u32 dropped[2];
};

/**
 * struct ksz_port_cfg - Port configuration data structure
 * @vid:	VID value.
 * @member:	Port membership.
 * @port_prio:	Port priority.
 * @rx_rate:	Receive priority rate.
 * @tx_rate:	Transmit priority rate.
 * @stp_state:	Current Spanning Tree Protocol state.
 */
struct ksz_port_cfg {
	u16 vid;
	u8 member;
	u8 port_prio;
	u32 rx_rate[PRIO_QUEUES];
	u32 tx_rate[PRIO_QUEUES];
	int stp_state;
};

/**
 * struct ksz_switch - KSZ8842 switch data structure
 * @mac_table:	MAC table entries information.
 * @vlan_table:	VLAN table entries information.
 * @port_cfg:	Port configuration information.
 * @diffserv:	DiffServ priority settings.  Possible values from 6-bit of ToS
 * 		(bit7 ~ bit2) field.
 * @p_802_1p:	802.1P priority settings.  Possible values from 3-bit of 802.1p
 * 		Tag priority field.
 * @br_addr:	Bridge address.  Used for STP.
 * @other_addr:	Other MAC address.  Used for multiple network device mode.
 * @broad_per:	Broadcast storm percentage.
 * @member:	Current port membership.  Used for STP.
 */
struct ksz_switch {
	struct ksz_mac_table mac_table[STATIC_MAC_TABLE_ENTRIES];
	struct ksz_vlan_table vlan_table[VLAN_TABLE_ENTRIES];
	struct ksz_port_cfg port_cfg[TOTAL_PORT_NUM];

	u8 diffserv[DIFFSERV_ENTRIES];
	u8 p_802_1p[PRIO_802_1P_ENTRIES];

	u8 br_addr[MAC_ADDR_LEN];
	u8 other_addr[MAC_ADDR_LEN];

	u8 broad_per;
	u8 member;
};

#define TX_RATE_UNIT			10000

/**
 * struct ksz_port_info - Port information data structure
 * @state:	Connection status of the port.
 * @tx_rate:	Transmit rate divided by 10000 to get Mbit.
 * @duplex:	Duplex mode.
 * @advertised:	Advertised auto-negotiation setting.  Used to determine link.
 * @partner:	Auto-negotiation partner setting.  Used to determine link.
 * @port_id:	Port index to access actual hardware register.
 * @pdev:	Pointer to OS dependent network device.
 */
struct ksz_port_info {
	uint state;
	uint tx_rate;
	u8 duplex;
	u8 advertised;
	u8 partner;
	u8 port_id;
	void *pdev;
};

#define MAX_TX_HELD_SIZE		52000

/* Hardware features and bug fixes. */
#define LINK_INT_WORKING		(1 << 0)
#define SMALL_PACKET_TX_BUG		(1 << 1)
#define HALF_DUPLEX_SIGNAL_BUG		(1 << 2)
#define IPV6_CSUM_GEN_HACK		(1 << 3)
#define RX_HUGE_FRAME			(1 << 4)
#define STP_SUPPORT			(1 << 8)

/* Software overrides. */
#define PAUSE_FLOW_CTRL			(1 << 0)
#define FAST_AGING			(1 << 1)

/**
 * struct ksz_hw - KSZ884X hardware data structure
 * @io:			Virtual address assigned.
 * @ksz_switch:		Pointer to KSZ8842 switch.
 * @port_info:		Port information.
 * @port_mib:		Port MIB information.
 * @dev_count:		Number of network devices this hardware supports.
 * @dst_ports:		Destination ports in switch for transmission.
 * @id:			Hardware ID.  Used for display only.
 * @mib_cnt:		Number of MIB counters this hardware has.
 * @mib_port_cnt:	Number of ports with MIB counters.
 * @tx_cfg:		Cached transmit control settings.
 * @rx_cfg:		Cached receive control settings.
 * @intr_mask:		Current interrupt mask.
 * @intr_set:		Current interrup set.
 * @intr_blocked:	Interrupt blocked.
 * @rx_desc_info:	Receive descriptor information.
 * @tx_desc_info:	Transmit descriptor information.
 * @tx_int_cnt:		Transmit interrupt count.  Used for TX optimization.
 * @tx_int_mask:	Transmit interrupt mask.  Used for TX optimization.
 * @tx_size:		Transmit data size.  Used for TX optimization.
 * 			The maximum is defined by MAX_TX_HELD_SIZE.
 * @perm_addr:		Permanent MAC address.
 * @override_addr:	Overrided MAC address.
 * @address:		Additional MAC address entries.
 * @addr_list_size:	Additional MAC address list size.
 * @mac_override:	Indication of MAC address overrided.
 * @promiscuous:	Counter to keep track of promiscuous mode set.
 * @all_multi:		Counter to keep track of all multicast mode set.
 * @multi_list:		Multicast address entries.
 * @multi_bits:		Cached multicast hash table settings.
 * @multi_list_size:	Multicast address list size.
 * @enabled:		Indication of hardware enabled.
 * @rx_stop:		Indication of receive process stop.
 * @features:		Hardware features to enable.
 * @overrides:		Hardware features to override.
 * @parent:		Pointer to parent, network device private structure.
 */
struct ksz_hw {
	void __iomem *io;

	struct ksz_switch *ksz_switch;
	struct ksz_port_info port_info[SWITCH_PORT_NUM];
	struct ksz_port_mib port_mib[TOTAL_PORT_NUM];
	int dev_count;
	int dst_ports;
	int id;
	int mib_cnt;
	int mib_port_cnt;

	u32 tx_cfg;
	u32 rx_cfg;
	u32 intr_mask;
	u32 intr_set;
	uint intr_blocked;

	struct ksz_desc_info rx_desc_info;
	struct ksz_desc_info tx_desc_info;

	int tx_int_cnt;
	int tx_int_mask;
	int tx_size;

	u8 perm_addr[MAC_ADDR_LEN];
	u8 override_addr[MAC_ADDR_LEN];
	u8 address[ADDITIONAL_ENTRIES][MAC_ADDR_LEN];
	u8 addr_list_size;
	u8 mac_override;
	u8 promiscuous;
	u8 all_multi;
	u8 multi_list[MAX_MULTICAST_LIST][MAC_ADDR_LEN];
	u8 multi_bits[HW_MULTICAST_SIZE];
	u8 multi_list_size;

	u8 enabled;
	u8 rx_stop;
	u8 reserved2[1];

	uint features;
	uint overrides;

	void *parent;
};

enum {
	PHY_NO_FLOW_CTRL,
	PHY_FLOW_CTRL,
	PHY_TX_ONLY,
	PHY_RX_ONLY
};

/**
 * struct ksz_port - Virtual port data structure
 * @duplex:		Duplex mode setting.  1 for half duplex, 2 for full
 * 			duplex, and 0 for auto, which normally results in full
 * 			duplex.
 * @speed:		Speed setting.  10 for 10 Mbit, 100 for 100 Mbit, and
 * 			0 for auto, which normally results in 100 Mbit.
 * @force_link:		Force link setting.  0 for auto-negotiation, and 1 for
 * 			force.
 * @flow_ctrl:		Flow control setting.  PHY_NO_FLOW_CTRL for no flow
 * 			control, and PHY_FLOW_CTRL for flow control.
 * 			PHY_TX_ONLY and PHY_RX_ONLY are not supported for 100
 * 			Mbit PHY.
 * @first_port:		Index of first port this port supports.
 * @mib_port_cnt:	Number of ports with MIB counters.
 * @port_cnt:		Number of ports this port supports.
 * @counter:		Port statistics counter.
 * @hw:			Pointer to hardware structure.
 * @linked:		Pointer to port information linked to this port.
 */
struct ksz_port {
	u8 duplex;
	u8 speed;
	u8 force_link;
	u8 flow_ctrl;

	int first_port;
	int mib_port_cnt;
	int port_cnt;
	u64 counter[OID_COUNTER_LAST];

	struct ksz_hw *hw;
	struct ksz_port_info *linked;
};

/**
 * struct ksz_timer_info - Timer information data structure
 * @timer:	Kernel timer.
 * @cnt:	Running timer counter.
 * @max:	Number of times to run timer; -1 for infinity.
 * @period:	Timer period in jiffies.
 */
struct ksz_timer_info {
	struct timer_list timer;
	int cnt;
	int max;
	int period;
};

/**
 * struct ksz_shared_mem - OS dependent shared memory data structure
 * @dma_addr:	Physical DMA address allocated.
 * @alloc_size:	Allocation size.
 * @phys:	Actual physical address used.
 * @alloc_virt:	Virtual address allocated.
 * @virt:	Actual virtual address used.
 */
struct ksz_shared_mem {
	dma_addr_t dma_addr;
	uint alloc_size;
	uint phys;
	u8 *alloc_virt;
	u8 *virt;
};

/**
 * struct ksz_counter_info - OS dependent counter information data structure
 * @counter:	Wait queue to wakeup after counters are read.
 * @time:	Next time in jiffies to read counter.
 * @read:	Indication of counters read in full or not.
 */
struct ksz_counter_info {
	wait_queue_head_t counter;
	unsigned long time;
	int read;
};

/**
 * struct dev_info - Network device information data structure
 * @dev:		Pointer to network device.
 * @pdev:		Pointer to PCI device.
 * @hw:			Hardware structure.
 * @desc_pool:		Physical memory used for descriptor pool.
 * @hwlock:		Spinlock to prevent hardware from accessing.
 * @lock:		Mutex lock to prevent device from accessing.
 * @dev_rcv:		Receive process function used.
 * @last_skb:		Socket buffer allocated for descriptor rx fragments.
 * @skb_index:		Buffer index for receiving fragments.
 * @skb_len:		Buffer length for receiving fragments.
 * @mib_read:		Workqueue to read MIB counters.
 * @mib_timer_info:	Timer to read MIB counters.
 * @counter:		Used for MIB reading.
 * @mtu:		Current MTU used.  The default is REGULAR_RX_BUF_SIZE;
 * 			the maximum is MAX_RX_BUF_SIZE.
 * @opened:		Counter to keep track of device open.
 * @rx_tasklet:		Receive processing tasklet.
 * @tx_tasklet:		Transmit processing tasklet.
 * @wol_enable:		Wake-on-LAN enable set by ethtool.
 * @wol_support:	Wake-on-LAN support used by ethtool.
 * @pme_wait:		Used for KSZ8841 power management.
 */
struct dev_info {
	struct net_device *dev;
	struct pci_dev *pdev;

	struct ksz_hw hw;
	struct ksz_shared_mem desc_pool;

	spinlock_t hwlock;
	struct mutex lock;

	int (*dev_rcv)(struct dev_info *);

	struct sk_buff *last_skb;
	int skb_index;
	int skb_len;

	struct work_struct mib_read;
	struct ksz_timer_info mib_timer_info;
	struct ksz_counter_info counter[TOTAL_PORT_NUM];

	int mtu;
	int opened;

	struct tasklet_struct rx_tasklet;
	struct tasklet_struct tx_tasklet;

	int wol_enable;
	int wol_support;
	unsigned long pme_wait;
};

/**
 * struct dev_priv - Network device private data structure
 * @adapter:		Adapter device information.
 * @port:		Port information.
 * @monitor_time_info:	Timer to monitor ports.
 * @proc_sem:		Semaphore for proc accessing.
 * @id:			Device ID.
 * @mii_if:		MII interface information.
 * @advertising:	Temporary variable to store advertised settings.
 * @msg_enable:		The message flags controlling driver output.
 * @media_state:	The connection status of the device.
 * @multicast:		The all multicast state of the device.
 * @promiscuous:	The promiscuous state of the device.
 */
struct dev_priv {
	struct dev_info *adapter;
	struct ksz_port port;
	struct ksz_timer_info monitor_timer_info;

	struct semaphore proc_sem;
	int id;

	struct mii_if_info mii_if;
	u32 advertising;

	u32 msg_enable;
	int media_state;
	int multicast;
	int promiscuous;
};

#define DRV_NAME		"KSZ884X PCI"
#define DEVICE_NAME		"KSZ884x PCI"
#define DRV_VERSION		"1.0.0"
#define DRV_RELDATE		"Feb 8, 2010"

static char version[] __devinitdata =
	"Micrel " DEVICE_NAME " " DRV_VERSION " (" DRV_RELDATE ")";

static u8 DEFAULT_MAC_ADDRESS[] = { 0x00, 0x10, 0xA1, 0x88, 0x42, 0x01 };

/*
 * Interrupt processing primary routines
 */

static inline void hw_ack_intr(struct ksz_hw *hw, uint interrupt)
{
	writel(interrupt, hw->io + KS884X_INTERRUPTS_STATUS);
}

static inline void hw_dis_intr(struct ksz_hw *hw)
{
	hw->intr_blocked = hw->intr_mask;
	writel(0, hw->io + KS884X_INTERRUPTS_ENABLE);
	hw->intr_set = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_set_intr(struct ksz_hw *hw, uint interrupt)
{
	hw->intr_set = interrupt;
	writel(interrupt, hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_ena_intr(struct ksz_hw *hw)
{
	hw->intr_blocked = 0;
	hw_set_intr(hw, hw->intr_mask);
}

static inline void hw_dis_intr_bit(struct ksz_hw *hw, uint bit)
{
	hw->intr_mask &= ~(bit);
}

static inline void hw_turn_off_intr(struct ksz_hw *hw, uint interrupt)
{
	u32 read_intr;

	read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
	hw->intr_set = read_intr & ~interrupt;
	writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
	hw_dis_intr_bit(hw, interrupt);
}

/**
 * hw_turn_on_intr - turn on specified interrupts
 * @hw: 	The hardware instance.
 * @bit:	The interrupt bits to be on.
 *
 * This routine turns on the specified interrupts in the interrupt mask so that
 * those interrupts will be enabled.
 */
static void hw_turn_on_intr(struct ksz_hw *hw, u32 bit)
{
	hw->intr_mask |= bit;

	if (!hw->intr_blocked)
		hw_set_intr(hw, hw->intr_mask);
}

static inline void hw_ena_intr_bit(struct ksz_hw *hw, uint interrupt)
{
	u32 read_intr;

	read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
	hw->intr_set = read_intr | interrupt;
	writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
}

static inline void hw_read_intr(struct ksz_hw *hw, uint *status)
{
	*status = readl(hw->io + KS884X_INTERRUPTS_STATUS);
	*status = *status & hw->intr_set;
}

static inline void hw_restore_intr(struct ksz_hw *hw, uint interrupt)
{
	if (interrupt)
		hw_ena_intr(hw);
}

/**
 * hw_block_intr - block hardware interrupts
 *
 * This function blocks all interrupts of the hardware and returns the current
 * interrupt enable mask so that interrupts can be restored later.
 *
 * Return the current interrupt enable mask.
 */
static uint hw_block_intr(struct ksz_hw *hw)
{
	uint interrupt = 0;

	if (!hw->intr_blocked) {
		hw_dis_intr(hw);
		interrupt = hw->intr_blocked;
	}
	return interrupt;
}

/*
 * Hardware descriptor routines
 */

static inline void reset_desc(struct ksz_desc *desc, union desc_stat status)
{
	status.rx.hw_owned = 0;
	desc->phw->ctrl.data = cpu_to_le32(status.data);
}

static inline void release_desc(struct ksz_desc *desc)
{
	desc->sw.ctrl.tx.hw_owned = 1;
	if (desc->sw.buf_size != desc->sw.buf.data) {
		desc->sw.buf_size = desc->sw.buf.data;
		desc->phw->buf.data = cpu_to_le32(desc->sw.buf.data);
	}
	desc->phw->ctrl.data = cpu_to_le32(desc->sw.ctrl.data);
}

static void get_rx_pkt(struct ksz_desc_info *info, struct ksz_desc **desc)
{
	*desc = &info->ring[info->last];
	info->last++;
	info->last &= info->mask;
	info->avail--;
	(*desc)->sw.buf.data &= ~KS_DESC_RX_MASK;
}

static inline void set_rx_buf(struct ksz_desc *desc, u32 addr)
{
	desc->phw->addr = cpu_to_le32(addr);
}

static inline void set_rx_len(struct ksz_desc *desc, u32 len)
{
	desc->sw.buf.rx.buf_size = len;
}

static inline void get_tx_pkt(struct ksz_desc_info *info,
	struct ksz_desc **desc)
{
	*desc = &info->ring[info->next];
	info->next++;
	info->next &= info->mask;
	info->avail--;
	(*desc)->sw.buf.data &= ~KS_DESC_TX_MASK;
}

static inline void set_tx_buf(struct ksz_desc *desc, u32 addr)
{
	desc->phw->addr = cpu_to_le32(addr);
}

static inline void set_tx_len(struct ksz_desc *desc, u32 len)
{
	desc->sw.buf.tx.buf_size = len;
}

/* Switch functions */

#define TABLE_READ			0x10
#define TABLE_SEL_SHIFT			2

#define HW_DELAY(hw, reg)			\
	do {					\
		u16 dummy;			\
		dummy = readw(hw->io + reg);	\
	} while (0)

/**
 * sw_r_table - read 4 bytes of data from switch table
 * @hw:		The hardware instance.
 * @table:	The table selector.
 * @addr:	The address of the table entry.
 * @data:	Buffer to store the read data.
 *
 * This routine reads 4 bytes of data from the table of the switch.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void sw_r_table(struct ksz_hw *hw, int table, u16 addr, u32 *data)
{
	u16 ctrl_addr;
	uint interrupt;

	ctrl_addr = (((table << TABLE_SEL_SHIFT) | TABLE_READ) << 8) | addr;

	interrupt = hw_block_intr(hw);

	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
	HW_DELAY(hw, KS884X_IACR_OFFSET);
	*data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

	hw_restore_intr(hw, interrupt);
}

/**
 * sw_w_table_64 - write 8 bytes of data to the switch table
 * @hw:		The hardware instance.
 * @table:	The table selector.
 * @addr:	The address of the table entry.
 * @data_hi:	The high part of data to be written (bit63 ~ bit32).
 * @data_lo:	The low part of data to be written (bit31 ~ bit0).
 *
 * This routine writes 8 bytes of data to the table of the switch.
 * Hardware interrupts are disabled to minimize corruption of written data.
 */
static void sw_w_table_64(struct ksz_hw *hw, int table, u16 addr, u32 data_hi,
	u32 data_lo)
{
	u16 ctrl_addr;
	uint interrupt;

	ctrl_addr = ((table << TABLE_SEL_SHIFT) << 8) | addr;

	interrupt = hw_block_intr(hw);

	writel(data_hi, hw->io + KS884X_ACC_DATA_4_OFFSET);
	writel(data_lo, hw->io + KS884X_ACC_DATA_0_OFFSET);

	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
	HW_DELAY(hw, KS884X_IACR_OFFSET);

	hw_restore_intr(hw, interrupt);
}

/**
 * sw_w_sta_mac_table - write to the static MAC table
 * @hw: 	The hardware instance.
 * @addr:	The address of the table entry.
 * @mac_addr:	The MAC address.
 * @ports:	The port members.
 * @override:	The flag to override the port receive/transmit settings.
 * @valid:	The flag to indicate entry is valid.
 * @use_fid:	The flag to indicate the FID is valid.
 * @fid:	The FID value.
 *
 * This routine writes an entry of the static MAC table of the switch.  It
 * calls sw_w_table_64() to write the data.
 */
static void sw_w_sta_mac_table(struct ksz_hw *hw, u16 addr, u8 *mac_addr,
	u8 ports, int override, int valid, int use_fid, u8 fid)
{
	u32 data_hi;
	u32 data_lo;

	data_lo = ((u32) mac_addr[2] << 24) |
		((u32) mac_addr[3] << 16) |
		((u32) mac_addr[4] << 8) | mac_addr[5];
	data_hi = ((u32) mac_addr[0] << 8) | mac_addr[1];
	data_hi |= (u32) ports << STATIC_MAC_FWD_PORTS_SHIFT;

	if (override)
		data_hi |= STATIC_MAC_TABLE_OVERRIDE;
	if (use_fid) {
		data_hi |= STATIC_MAC_TABLE_USE_FID;
		data_hi |= (u32) fid << STATIC_MAC_FID_SHIFT;
	}
	if (valid)
		data_hi |= STATIC_MAC_TABLE_VALID;

	sw_w_table_64(hw, TABLE_STATIC_MAC, addr, data_hi, data_lo);
}

/**
 * sw_r_vlan_table - read from the VLAN table
 * @hw: 	The hardware instance.
 * @addr:	The address of the table entry.
 * @vid:	Buffer to store the VID.
 * @fid:	Buffer to store the VID.
 * @member:	Buffer to store the port membership.
 *
 * This function reads an entry of the VLAN table of the switch.  It calls
 * sw_r_table() to get the data.
 *
 * Return 0 if the entry is valid; otherwise -1.
 */
static int sw_r_vlan_table(struct ksz_hw *hw, u16 addr, u16 *vid, u8 *fid,
	u8 *member)
{
	u32 data;

	sw_r_table(hw, TABLE_VLAN, addr, &data);
	if (data & VLAN_TABLE_VALID) {
		*vid = (u16)(data & VLAN_TABLE_VID);
		*fid = (u8)((data & VLAN_TABLE_FID) >> VLAN_TABLE_FID_SHIFT);
		*member = (u8)((data & VLAN_TABLE_MEMBERSHIP) >>
			VLAN_TABLE_MEMBERSHIP_SHIFT);
		return 0;
	}
	return -1;
}

/**
 * port_r_mib_cnt - read MIB counter
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @addr:	The address of the counter.
 * @cnt:	Buffer to store the counter.
 *
 * This routine reads a MIB counter of the port.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void port_r_mib_cnt(struct ksz_hw *hw, int port, u16 addr, u64 *cnt)
{
	u32 data;
	u16 ctrl_addr;
	uint interrupt;
	int timeout;

	ctrl_addr = addr + PORT_COUNTER_NUM * port;

	interrupt = hw_block_intr(hw);

	ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ) << 8);
	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
	HW_DELAY(hw, KS884X_IACR_OFFSET);

	for (timeout = 100; timeout > 0; timeout--) {
		data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

		if (data & MIB_COUNTER_VALID) {
			if (data & MIB_COUNTER_OVERFLOW)
				*cnt += MIB_COUNTER_VALUE + 1;
			*cnt += data & MIB_COUNTER_VALUE;
			break;
		}
	}

	hw_restore_intr(hw, interrupt);
}

/**
 * port_r_mib_pkt - read dropped packet counts
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @cnt:	Buffer to store the receive and transmit dropped packet counts.
 *
 * This routine reads the dropped packet counts of the port.
 * Hardware interrupts are disabled to minimize corruption of read data.
 */
static void port_r_mib_pkt(struct ksz_hw *hw, int port, u32 *last, u64 *cnt)
{
	u32 cur;
	u32 data;
	u16 ctrl_addr;
	uint interrupt;
	int index;

	index = KS_MIB_PACKET_DROPPED_RX_0 + port;
	do {
		interrupt = hw_block_intr(hw);

		ctrl_addr = (u16) index;
		ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ)
			<< 8);
		writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
		HW_DELAY(hw, KS884X_IACR_OFFSET);
		data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);

		hw_restore_intr(hw, interrupt);

		data &= MIB_PACKET_DROPPED;
		cur = *last;
		if (data != cur) {
			*last = data;
			if (data < cur)
				data += MIB_PACKET_DROPPED + 1;
			data -= cur;
			*cnt += data;
		}
		++last;
		++cnt;
		index -= KS_MIB_PACKET_DROPPED_TX -
			KS_MIB_PACKET_DROPPED_TX_0 + 1;
	} while (index >= KS_MIB_PACKET_DROPPED_TX_0 + port);
}

/**
 * port_r_cnt - read MIB counters periodically
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine is used to read the counters of the port periodically to avoid
 * counter overflow.  The hardware should be acquired first before calling this
 * routine.
 *
 * Return non-zero when not all counters not read.
 */
static int port_r_cnt(struct ksz_hw *hw, int port)
{
	struct ksz_port_mib *mib = &hw->port_mib[port];

	if (mib->mib_start < PORT_COUNTER_NUM)
		while (mib->cnt_ptr < PORT_COUNTER_NUM) {
			port_r_mib_cnt(hw, port, mib->cnt_ptr,
				&mib->counter[mib->cnt_ptr]);
			++mib->cnt_ptr;
		}
	if (hw->mib_cnt > PORT_COUNTER_NUM)
		port_r_mib_pkt(hw, port, mib->dropped,
			&mib->counter[PORT_COUNTER_NUM]);
	mib->cnt_ptr = 0;
	return 0;
}

/**
 * port_init_cnt - initialize MIB counter values
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine is used to initialize all counters to zero if the hardware
 * cannot do it after reset.
 */
static void port_init_cnt(struct ksz_hw *hw, int port)
{
	struct ksz_port_mib *mib = &hw->port_mib[port];

	mib->cnt_ptr = 0;
	if (mib->mib_start < PORT_COUNTER_NUM)
		do {
			port_r_mib_cnt(hw, port, mib->cnt_ptr,
				&mib->counter[mib->cnt_ptr]);
			++mib->cnt_ptr;
		} while (mib->cnt_ptr < PORT_COUNTER_NUM);
	if (hw->mib_cnt > PORT_COUNTER_NUM)
		port_r_mib_pkt(hw, port, mib->dropped,
			&mib->counter[PORT_COUNTER_NUM]);
	memset((void *) mib->counter, 0, sizeof(u64) * TOTAL_PORT_COUNTER_NUM);
	mib->cnt_ptr = 0;
}

/*
 * Port functions
 */

/**
 * port_chk - check port register bits
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the port register.
 * @bits:	The data bits to check.
 *
 * This function checks whether the specified bits of the port register are set
 * or not.
 *
 * Return 0 if the bits are not set.
 */
static int port_chk(struct ksz_hw *hw, int port, int offset, u16 bits)
{
	u32 addr;
	u16 data;

	PORT_CTRL_ADDR(port, addr);
	addr += offset;
	data = readw(hw->io + addr);
	return (data & bits) == bits;
}

/**
 * port_cfg - set port register bits
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the port register.
 * @bits:	The data bits to set.
 * @set:	The flag indicating whether the bits are to be set or not.
 *
 * This routine sets or resets the specified bits of the port register.
 */
static void port_cfg(struct ksz_hw *hw, int port, int offset, u16 bits,
	int set)
{
	u32 addr;
	u16 data;

	PORT_CTRL_ADDR(port, addr);
	addr += offset;
	data = readw(hw->io + addr);
	if (set)
		data |= bits;
	else
		data &= ~bits;
	writew(data, hw->io + addr);
}

/**
 * port_chk_shift - check port bit
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the register.
 * @shift:	Number of bits to shift.
 *
 * This function checks whether the specified port is set in the register or
 * not.
 *
 * Return 0 if the port is not set.
 */
static int port_chk_shift(struct ksz_hw *hw, int port, u32 addr, int shift)
{
	u16 data;
	u16 bit = 1 << port;

	data = readw(hw->io + addr);
	data >>= shift;
	return (data & bit) == bit;
}

/**
 * port_cfg_shift - set port bit
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the register.
 * @shift:	Number of bits to shift.
 * @set:	The flag indicating whether the port is to be set or not.
 *
 * This routine sets or resets the specified port in the register.
 */
static void port_cfg_shift(struct ksz_hw *hw, int port, u32 addr, int shift,
	int set)
{
	u16 data;
	u16 bits = 1 << port;

	data = readw(hw->io + addr);
	bits <<= shift;
	if (set)
		data |= bits;
	else
		data &= ~bits;
	writew(data, hw->io + addr);
}

/**
 * port_r8 - read byte from port register
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the port register.
 * @data:	Buffer to store the data.
 *
 * This routine reads a byte from the port register.
 */
static void port_r8(struct ksz_hw *hw, int port, int offset, u8 *data)
{
	u32 addr;

	PORT_CTRL_ADDR(port, addr);
	addr += offset;
	*data = readb(hw->io + addr);
}

/**
 * port_r16 - read word from port register.
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the port register.
 * @data:	Buffer to store the data.
 *
 * This routine reads a word from the port register.
 */
static void port_r16(struct ksz_hw *hw, int port, int offset, u16 *data)
{
	u32 addr;

	PORT_CTRL_ADDR(port, addr);
	addr += offset;
	*data = readw(hw->io + addr);
}

/**
 * port_w16 - write word to port register.
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @offset:	The offset of the port register.
 * @data:	Data to write.
 *
 * This routine writes a word to the port register.
 */
static void port_w16(struct ksz_hw *hw, int port, int offset, u16 data)
{
	u32 addr;

	PORT_CTRL_ADDR(port, addr);
	addr += offset;
	writew(data, hw->io + addr);
}

/**
 * sw_chk - check switch register bits
 * @hw: 	The hardware instance.
 * @addr:	The address of the switch register.
 * @bits:	The data bits to check.
 *
 * This function checks whether the specified bits of the switch register are
 * set or not.
 *
 * Return 0 if the bits are not set.
 */
static int sw_chk(struct ksz_hw *hw, u32 addr, u16 bits)
{
	u16 data;

	data = readw(hw->io + addr);
	return (data & bits) == bits;
}

/**
 * sw_cfg - set switch register bits
 * @hw: 	The hardware instance.
 * @addr:	The address of the switch register.
 * @bits:	The data bits to set.
 * @set:	The flag indicating whether the bits are to be set or not.
 *
 * This function sets or resets the specified bits of the switch register.
 */
static void sw_cfg(struct ksz_hw *hw, u32 addr, u16 bits, int set)
{
	u16 data;

	data = readw(hw->io + addr);
	if (set)
		data |= bits;
	else
		data &= ~bits;
	writew(data, hw->io + addr);
}

/* Bandwidth */

static inline void port_cfg_broad_storm(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM, set);
}

static inline int port_chk_broad_storm(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM);
}

/* Driver set switch broadcast storm protection at 10% rate. */
#define BROADCAST_STORM_PROTECTION_RATE	10

/* 148,800 frames * 67 ms / 100 */
#define BROADCAST_STORM_VALUE		9969

/**
 * sw_cfg_broad_storm - configure broadcast storm threshold
 * @hw: 	The hardware instance.
 * @percent:	Broadcast storm threshold in percent of transmit rate.
 *
 * This routine configures the broadcast storm threshold of the switch.
 */
static void sw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
{
	u16 data;
	u32 value = ((u32) BROADCAST_STORM_VALUE * (u32) percent / 100);

	if (value > BROADCAST_STORM_RATE)
		value = BROADCAST_STORM_RATE;

	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
	data &= ~(BROADCAST_STORM_RATE_LO | BROADCAST_STORM_RATE_HI);
	data |= ((value & 0x00FF) << 8) | ((value & 0xFF00) >> 8);
	writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
}

/**
 * sw_get_board_storm - get broadcast storm threshold
 * @hw: 	The hardware instance.
 * @percent:	Buffer to store the broadcast storm threshold percentage.
 *
 * This routine retrieves the broadcast storm threshold of the switch.
 */
static void sw_get_broad_storm(struct ksz_hw *hw, u8 *percent)
{
	int num;
	u16 data;

	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
	num = (data & BROADCAST_STORM_RATE_HI);
	num <<= 8;
	num |= (data & BROADCAST_STORM_RATE_LO) >> 8;
	num = (num * 100 + BROADCAST_STORM_VALUE / 2) / BROADCAST_STORM_VALUE;
	*percent = (u8) num;
}

/**
 * sw_dis_broad_storm - disable broadstorm
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine disables the broadcast storm limit function of the switch.
 */
static void sw_dis_broad_storm(struct ksz_hw *hw, int port)
{
	port_cfg_broad_storm(hw, port, 0);
}

/**
 * sw_ena_broad_storm - enable broadcast storm
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine enables the broadcast storm limit function of the switch.
 */
static void sw_ena_broad_storm(struct ksz_hw *hw, int port)
{
	sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
	port_cfg_broad_storm(hw, port, 1);
}

/**
 * sw_init_broad_storm - initialize broadcast storm
 * @hw: 	The hardware instance.
 *
 * This routine initializes the broadcast storm limit function of the switch.
 */
static void sw_init_broad_storm(struct ksz_hw *hw)
{
	int port;

	hw->ksz_switch->broad_per = 1;
	sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
	for (port = 0; port < TOTAL_PORT_NUM; port++)
		sw_dis_broad_storm(hw, port);
	sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, MULTICAST_STORM_DISABLE, 1);
}

/**
 * hw_cfg_broad_storm - configure broadcast storm
 * @hw: 	The hardware instance.
 * @percent:	Broadcast storm threshold in percent of transmit rate.
 *
 * This routine configures the broadcast storm threshold of the switch.
 * It is called by user functions.  The hardware should be acquired first.
 */
static void hw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
{
	if (percent > 100)
		percent = 100;

	sw_cfg_broad_storm(hw, percent);
	sw_get_broad_storm(hw, &percent);
	hw->ksz_switch->broad_per = percent;
}

/**
 * sw_dis_prio_rate - disable switch priority rate
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine disables the priority rate function of the switch.
 */
static void sw_dis_prio_rate(struct ksz_hw *hw, int port)
{
	u32 addr;

	PORT_CTRL_ADDR(port, addr);
	addr += KS8842_PORT_IN_RATE_OFFSET;
	writel(0, hw->io + addr);
}

/**
 * sw_init_prio_rate - initialize switch prioirty rate
 * @hw: 	The hardware instance.
 *
 * This routine initializes the priority rate function of the switch.
 */
static void sw_init_prio_rate(struct ksz_hw *hw)
{
	int port;
	int prio;
	struct ksz_switch *sw = hw->ksz_switch;

	for (port = 0; port < TOTAL_PORT_NUM; port++) {
		for (prio = 0; prio < PRIO_QUEUES; prio++) {
			sw->port_cfg[port].rx_rate[prio] =
			sw->port_cfg[port].tx_rate[prio] = 0;
		}
		sw_dis_prio_rate(hw, port);
	}
}

/* Communication */

static inline void port_cfg_back_pressure(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE, set);
}

static inline void port_cfg_force_flow_ctrl(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL, set);
}

static inline int port_chk_back_pressure(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE);
}

static inline int port_chk_force_flow_ctrl(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL);
}

/* Spanning Tree */

static inline void port_cfg_dis_learn(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_LEARN_DISABLE, set);
}

static inline void port_cfg_rx(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_RX_ENABLE, set);
}

static inline void port_cfg_tx(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_TX_ENABLE, set);
}

static inline void sw_cfg_fast_aging(struct ksz_hw *hw, int set)
{
	sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET, SWITCH_FAST_AGING, set);
}

static inline void sw_flush_dyn_mac_table(struct ksz_hw *hw)
{
	if (!(hw->overrides & FAST_AGING)) {
		sw_cfg_fast_aging(hw, 1);
		mdelay(1);
		sw_cfg_fast_aging(hw, 0);
	}
}

/* VLAN */

static inline void port_cfg_ins_tag(struct ksz_hw *hw, int p, int insert)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG, insert);
}

static inline void port_cfg_rmv_tag(struct ksz_hw *hw, int p, int remove)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG, remove);
}

static inline int port_chk_ins_tag(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG);
}

static inline int port_chk_rmv_tag(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG);
}

static inline void port_cfg_dis_non_vid(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID, set);
}

static inline void port_cfg_in_filter(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER, set);
}

static inline int port_chk_dis_non_vid(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID);
}

static inline int port_chk_in_filter(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER);
}

/* Mirroring */

static inline void port_cfg_mirror_sniffer(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_SNIFFER, set);
}

static inline void port_cfg_mirror_rx(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_RX, set);
}

static inline void port_cfg_mirror_tx(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_TX, set);
}

static inline void sw_cfg_mirror_rx_tx(struct ksz_hw *hw, int set)
{
	sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, SWITCH_MIRROR_RX_TX, set);
}

static void sw_init_mirror(struct ksz_hw *hw)
{
	int port;

	for (port = 0; port < TOTAL_PORT_NUM; port++) {
		port_cfg_mirror_sniffer(hw, port, 0);
		port_cfg_mirror_rx(hw, port, 0);
		port_cfg_mirror_tx(hw, port, 0);
	}
	sw_cfg_mirror_rx_tx(hw, 0);
}

static inline void sw_cfg_unk_def_deliver(struct ksz_hw *hw, int set)
{
	sw_cfg(hw, KS8842_SWITCH_CTRL_7_OFFSET,
		SWITCH_UNK_DEF_PORT_ENABLE, set);
}

static inline int sw_cfg_chk_unk_def_deliver(struct ksz_hw *hw)
{
	return sw_chk(hw, KS8842_SWITCH_CTRL_7_OFFSET,
		SWITCH_UNK_DEF_PORT_ENABLE);
}

static inline void sw_cfg_unk_def_port(struct ksz_hw *hw, int port, int set)
{
	port_cfg_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0, set);
}

static inline int sw_chk_unk_def_port(struct ksz_hw *hw, int port)
{
	return port_chk_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0);
}

/* Priority */

static inline void port_cfg_diffserv(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE, set);
}

static inline void port_cfg_802_1p(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE, set);
}

static inline void port_cfg_replace_vid(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING, set);
}

static inline void port_cfg_prio(struct ksz_hw *hw, int p, int set)
{
	port_cfg(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE, set);
}

static inline int port_chk_diffserv(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE);
}

static inline int port_chk_802_1p(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE);
}

static inline int port_chk_replace_vid(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING);
}

static inline int port_chk_prio(struct ksz_hw *hw, int p)
{
	return port_chk(hw, p,
		KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE);
}

/**
 * sw_dis_diffserv - disable switch DiffServ priority
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine disables the DiffServ priority function of the switch.
 */
static void sw_dis_diffserv(struct ksz_hw *hw, int port)
{
	port_cfg_diffserv(hw, port, 0);
}

/**
 * sw_dis_802_1p - disable switch 802.1p priority
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine disables the 802.1p priority function of the switch.
 */
static void sw_dis_802_1p(struct ksz_hw *hw, int port)
{
	port_cfg_802_1p(hw, port, 0);
}

/**
 * sw_cfg_replace_null_vid -
 * @hw: 	The hardware instance.
 * @set:	The flag to disable or enable.
 *
 */
static void sw_cfg_replace_null_vid(struct ksz_hw *hw, int set)
{
	sw_cfg(hw, KS8842_SWITCH_CTRL_3_OFFSET, SWITCH_REPLACE_NULL_VID, set);
}

/**
 * sw_cfg_replace_vid - enable switch 802.10 priority re-mapping
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @set:	The flag to disable or enable.
 *
 * This routine enables the 802.1p priority re-mapping function of the switch.
 * That allows 802.1p priority field to be replaced with the port's default
 * tag's priority value if the ingress packet's 802.1p priority has a higher
 * priority than port's default tag's priority.
 */
static void sw_cfg_replace_vid(struct ksz_hw *hw, int port, int set)
{
	port_cfg_replace_vid(hw, port, set);
}

/**
 * sw_cfg_port_based - configure switch port based priority
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @prio:	The priority to set.
 *
 * This routine configures the port based priority of the switch.
 */
static void sw_cfg_port_based(struct ksz_hw *hw, int port, u8 prio)
{
	u16 data;

	if (prio > PORT_BASED_PRIORITY_BASE)
		prio = PORT_BASED_PRIORITY_BASE;

	hw->ksz_switch->port_cfg[port].port_prio = prio;

	port_r16(hw, port, KS8842_PORT_CTRL_1_OFFSET, &data);
	data &= ~PORT_BASED_PRIORITY_MASK;
	data |= prio << PORT_BASED_PRIORITY_SHIFT;
	port_w16(hw, port, KS8842_PORT_CTRL_1_OFFSET, data);
}

/**
 * sw_dis_multi_queue - disable transmit multiple queues
 * @hw: 	The hardware instance.
 * @port:	The port index.
 *
 * This routine disables the transmit multiple queues selection of the switch
 * port.  Only single transmit queue on the port.
 */
static void sw_dis_multi_queue(struct ksz_hw *hw, int port)
{
	port_cfg_prio(hw, port, 0);
}

/**
 * sw_init_prio - initialize switch priority
 * @hw: 	The hardware instance.
 *
 * This routine initializes the switch QoS priority functions.
 */
static void sw_init_prio(struct ksz_hw *hw)
{
	int port;
	int tos;
	struct ksz_switch *sw = hw->ksz_switch;

	/*
	 * Init all the 802.1p tag priority value to be assigned to different
	 * priority queue.
	 */
	sw->p_802_1p[0] = 0;
	sw->p_802_1p[1] = 0;
	sw->p_802_1p[2] = 1;
	sw->p_802_1p[3] = 1;
	sw->p_802_1p[4] = 2;
	sw->p_802_1p[5] = 2;
	sw->p_802_1p[6] = 3;
	sw->p_802_1p[7] = 3;

	/*
	 * Init all the DiffServ priority value to be assigned to priority
	 * queue 0.
	 */
	for (tos = 0; tos < DIFFSERV_ENTRIES; tos++)
		sw->diffserv[tos] = 0;

	/* All QoS functions disabled. */
	for (port = 0; port < TOTAL_PORT_NUM; port++) {
		sw_dis_multi_queue(hw, port);
		sw_dis_diffserv(hw, port);
		sw_dis_802_1p(hw, port);
		sw_cfg_replace_vid(hw, port, 0);

		sw->port_cfg[port].port_prio = 0;
		sw_cfg_port_based(hw, port, sw->port_cfg[port].port_prio);
	}
	sw_cfg_replace_null_vid(hw, 0);
}

/**
 * port_get_def_vid - get port default VID.
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @vid:	Buffer to store the VID.
 *
 * This routine retrieves the default VID of the port.
 */
static void port_get_def_vid(struct ksz_hw *hw, int port, u16 *vid)
{
	u32 addr;

	PORT_CTRL_ADDR(port, addr);
	addr += KS8842_PORT_CTRL_VID_OFFSET;
	*vid = readw(hw->io + addr);
}

/**
 * sw_init_vlan - initialize switch VLAN
 * @hw: 	The hardware instance.
 *
 * This routine initializes the VLAN function of the switch.
 */
static void sw_init_vlan(struct ksz_hw *hw)
{
	int port;
	int entry;
	struct ksz_switch *sw = hw->ksz_switch;

	/* Read 16 VLAN entries from device's VLAN table. */
	for (entry = 0; entry < VLAN_TABLE_ENTRIES; entry++) {
		sw_r_vlan_table(hw, entry,
			&sw->vlan_table[entry].vid,
			&sw->vlan_table[entry].fid,
			&sw->vlan_table[entry].member);
	}

	for (port = 0; port < TOTAL_PORT_NUM; port++) {
		port_get_def_vid(hw, port, &sw->port_cfg[port].vid);
		sw->port_cfg[port].member = PORT_MASK;
	}
}

/**
 * sw_cfg_port_base_vlan - configure port-based VLAN membership
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @member:	The port-based VLAN membership.
 *
 * This routine configures the port-based VLAN membership of the port.
 */
static void sw_cfg_port_base_vlan(struct ksz_hw *hw, int port, u8 member)
{
	u32 addr;
	u8 data;

	PORT_CTRL_ADDR(port, addr);
	addr += KS8842_PORT_CTRL_2_OFFSET;

	data = readb(hw->io + addr);
	data &= ~PORT_VLAN_MEMBERSHIP;
	data |= (member & PORT_MASK);
	writeb(data, hw->io + addr);

	hw->ksz_switch->port_cfg[port].member = member;
}

/**
 * sw_get_addr - get the switch MAC address.
 * @hw: 	The hardware instance.
 * @mac_addr:	Buffer to store the MAC address.
 *
 * This function retrieves the MAC address of the switch.
 */
static inline void sw_get_addr(struct ksz_hw *hw, u8 *mac_addr)
{
	int i;

	for (i = 0; i < 6; i += 2) {
		mac_addr[i] = readb(hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
		mac_addr[1 + i] = readb(hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
	}
}

/**
 * sw_set_addr - configure switch MAC address
 * @hw: 	The hardware instance.
 * @mac_addr:	The MAC address.
 *
 * This function configures the MAC address of the switch.
 */
static void sw_set_addr(struct ksz_hw *hw, u8 *mac_addr)
{
	int i;

	for (i = 0; i < 6; i += 2) {
		writeb(mac_addr[i], hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
		writeb(mac_addr[1 + i], hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
	}
}

/**
 * sw_set_global_ctrl - set switch global control
 * @hw: 	The hardware instance.
 *
 * This routine sets the global control of the switch function.
 */
static void sw_set_global_ctrl(struct ksz_hw *hw)
{
	u16 data;

	/* Enable switch MII flow control. */
	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
	data |= SWITCH_FLOW_CTRL;
	writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);

	data = readw(hw->io + KS8842_SWITCH_CTRL_1_OFFSET);

	/* Enable aggressive back off algorithm in half duplex mode. */
	data |= SWITCH_AGGR_BACKOFF;

	/* Enable automatic fast aging when link changed detected. */
	data |= SWITCH_AGING_ENABLE;
	data |= SWITCH_LINK_AUTO_AGING;

	if (hw->overrides & FAST_AGING)
		data |= SWITCH_FAST_AGING;
	else
		data &= ~SWITCH_FAST_AGING;
	writew(data, hw->io + KS8842_SWITCH_CTRL_1_OFFSET);

	data = readw(hw->io + KS8842_SWITCH_CTRL_2_OFFSET);

	/* Enable no excessive collision drop. */
	data |= NO_EXC_COLLISION_DROP;
	writew(data, hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
}

enum {
	STP_STATE_DISABLED = 0,
	STP_STATE_LISTENING,
	STP_STATE_LEARNING,
	STP_STATE_FORWARDING,
	STP_STATE_BLOCKED,
	STP_STATE_SIMPLE
};

/**
 * port_set_stp_state - configure port spanning tree state
 * @hw: 	The hardware instance.
 * @port:	The port index.
 * @state:	The spanning tree state.
 *
 * This routine configures the spanning tree state of the port.
 */
static void port_set_stp_state(struct ksz_hw *hw, int port, int state)
{
	u16 data;

	port_r16(hw, port, KS8842_PORT_CTRL_2_OFFSET, &data);
	switch (state) {
	case STP_STATE_DISABLED:
		data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
		data |= PORT_LEARN_DISABLE;
		break;
	case STP_STATE_LISTENING:
/*
 * No need to turn on transmit because of port direct mode.
 * Turning on receive is required if static MAC table is not setup.
 */
		data &= ~PORT_TX_ENABLE;
		data |= PORT_RX_ENABLE;
		data |= PORT_LEARN_DISABLE;
		break;
	case STP_STATE_LEARNING:
		data &= ~PORT_TX_ENABLE;
		data |= PORT_RX_ENABLE;
		data &= ~PORT_LEARN_DISABLE;
		break;
	case STP_STATE_FORWARDING:
		data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
		data &= ~PORT_LEARN_DISABLE;
		break;
	case STP_STATE_BLOCKED:
/*
 * Need to setup static MAC table with override to keep receiving BPDU
 * messages.  See sw_init_stp routine.
 */
		data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
		data |= PORT_LEARN_DISABLE;
		break;
	case STP_STATE_SIMPLE:
		data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
		data |= PORT_LEARN_DISABLE;
		break;
	}
	port_w16(hw, port, KS8842_PORT_CTRL_2_OFFSET, data);
	hw->ksz_switch->port_cfg[port].stp_state = state;
}

#define STP_ENTRY			0
#define BROADCAST_ENTRY			1
#define BRIDGE_ADDR_ENTRY		2
#define IPV6_ADDR_ENTRY			3

/**
 * sw_clr_sta_mac_table - clear static MAC table
 * @hw: 	The hardware instance.
 *
 * This routine clears the static MAC table.
 */
static void sw_clr_sta_mac_table(struct ksz_hw *hw)
{
	struct ksz_mac_table *entry;
	int i;

	for (i = 0; i < STATIC_MAC_TABLE_ENTRIES; i++) {
		entry = &hw->ksz_switch->mac_table[i];
		sw_w_sta_mac_table(hw, i,
			entry->mac_addr, entry->ports,
			entry->override, 0,
			entry->use_fid, entry->fid);
	}
}

/**
 * sw_init_stp - initialize switch spanning tree support
 * @hw: 	The hardware instance.
 *
 * This routine initializes the spanning tree support of the switch.
 */
static void sw_init_stp(struct ksz_hw *hw)
{
	struct ksz_mac_table *entry;

	entry = &hw->ksz_switch->mac_table[STP_ENTRY];
	entry->mac_addr[0] = 0x01;
	entry->mac_addr[1] = 0x80;
	entry->mac_addr[2] = 0xC2;
	entry->mac_addr[3] = 0x00;
	entry->mac_addr[4] = 0x00;
	entry->mac_addr[5] = 0x00;
	entry->ports = HOST_MASK;
	entry->override = 1;
	entry->valid = 1;
	sw_w_sta_mac_table(hw, STP_ENTRY,
		entry->mac_addr, entry->ports,
		entry->override, entry->valid,
		entry->use_fid, entry->fid);
}

/**
 * sw_block_addr - block certain packets from the host port
 * @hw: 	The hardware instance.
 *
 * This routine blocks certain packets from reaching to the host port.
 */
static void sw_block_addr(struct ksz_hw *hw)
{
	struct ksz_mac_table *entry;
	int i;

	for (i = BROADCAST_ENTRY; i <= IPV6_ADDR_ENTRY; i++) {
		entry = &hw->ksz_switch->mac_table[i];
		entry->valid = 0;
		sw_w_sta_mac_table(hw, i,
			entry->mac_addr, entry->ports,
			entry->override, entry->valid,
			entry->use_fid, entry->fid);
	}
}

#define PHY_LINK_SUPPORT		\
	(PHY_AUTO_NEG_ASYM_PAUSE |	\
	PHY_AUTO_NEG_SYM_PAUSE |	\
	PHY_AUTO_NEG_100BT4 |		\
	PHY_AUTO_NEG_100BTX_FD |	\
	PHY_AUTO_NEG_100BTX |		\
	PHY_AUTO_NEG_10BT_FD |		\
	PHY_AUTO_NEG_10BT)

static inline void hw_r_phy_ctrl(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_ctrl(struct ksz_hw *hw, int phy, u16 data)
{
	writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_link_stat(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_STATUS_OFFSET);
}

static inline void hw_r_phy_auto_neg(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
}

static inline void hw_w_phy_auto_neg(struct ksz_hw *hw, int phy, u16 data)
{
	writew(data, hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
}

static inline void hw_r_phy_rem_cap(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_REMOTE_CAP_OFFSET);
}

static inline void hw_r_phy_crossover(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_crossover(struct ksz_hw *hw, int phy, u16 data)
{
	writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_polarity(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
}

static inline void hw_w_phy_polarity(struct ksz_hw *hw, int phy, u16 data)
{
	writew(data, hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
}

static inline void hw_r_phy_link_md(struct ksz_hw *hw, int phy, u16 *data)
{
	*data = readw(hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
}

static inline void hw_w_phy_link_md(struct ksz_hw *hw, int phy, u16 data)
{
	writew(data, hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
}

/**
 * hw_r_phy - read data from PHY register
 * @hw: 	The hardware instance.
 * @port:	Port to read.
 * @reg:	PHY register to read.
 * @val:	Buffer to store the read data.
 *
 * This routine reads data from the PHY register.
 */
static void hw_r_phy(struct ksz_hw *hw, int port, u16 reg, u16 *val)
{
	int phy;

	phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
	*val = readw(hw->io + phy);
}

/**
 * port_w_phy - write data to PHY register
 * @hw: 	The hardware instance.
 * @port:	Port to write.
 * @reg:	PHY register to write.
 * @val:	Word data to write.
 *
 * This routine writes data to the PHY register.
 */
static void hw_w_phy(struct ksz_hw *hw, int port, u16 reg, u16 val)
{
	int phy;

	phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
	writew(val, hw->io + phy);
}

/*
 * EEPROM access functions
 */

#define AT93C_CODE			0
#define AT93C_WR_OFF			0x00
#define AT93C_WR_ALL			0x10
#define AT93C_ER_ALL			0x20
#define AT93C_WR_ON			0x30

#define AT93C_WRITE			1
#define AT93C_READ			2
#define AT93C_ERASE			3

#define EEPROM_DELAY			4

static inline void drop_gpio(struct ksz_hw *hw, u8 gpio)
{
	u16 data;

	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
	data &= ~gpio;
	writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
}

static inline void raise_gpio(struct ksz_hw *hw, u8 gpio)
{
	u16 data;

	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
	data |= gpio;
	writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
}

static inline u8 state_gpio(struct ksz_hw *hw, u8 gpio)
{
	u16 data;

	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
	return (u8)(data & gpio);
}

static void eeprom_clk(struct ksz_hw *hw)
{
	raise_gpio(hw, EEPROM_SERIAL_CLOCK);
	udelay(EEPROM_DELAY);
	drop_gpio(hw, EEPROM_SERIAL_CLOCK);
	udelay(EEPROM_DELAY);
}

static u16 spi_r(struct ksz_hw *hw)
{
	int i;
	u16 temp = 0;

	for (i = 15; i >= 0; i--) {
		raise_gpio(hw, EEPROM_SERIAL_CLOCK);
		udelay(EEPROM_DELAY);

		temp |= (state_gpio(hw, EEPROM_DATA_IN)) ? 1 << i : 0;

		drop_gpio(hw, EEPROM_SERIAL_CLOCK);
		udelay(EEPROM_DELAY);
	}
	return temp;
}

static void spi_w(struct ksz_hw *hw, u16 data)
{
	int i;

	for (i = 15; i >= 0; i--) {
		(data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
			drop_gpio(hw, EEPROM_DATA_OUT);
		eeprom_clk(hw);
	}
}

static void spi_reg(struct ksz_hw *hw, u8 data, u8 reg)
{
	int i;

	/* Initial start bit */
	raise_gpio(hw, EEPROM_DATA_OUT);
	eeprom_clk(hw);

	/* AT93C operation */
	for (i = 1; i >= 0; i--) {
		(data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
			drop_gpio(hw, EEPROM_DATA_OUT);
		eeprom_clk(hw);
	}

	/* Address location */
	for (i = 5; i >= 0; i--) {
		(reg & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
			drop_gpio(hw, EEPROM_DATA_OUT);
		eeprom_clk(hw);
	}
}

#define EEPROM_DATA_RESERVED		0
#define EEPROM_DATA_MAC_ADDR_0		1
#define EEPROM_DATA_MAC_ADDR_1		2
#define EEPROM_DATA_MAC_ADDR_2		3
#define EEPROM_DATA_SUBSYS_ID		4
#define EEPROM_DATA_SUBSYS_VEN_ID	5
#define EEPROM_DATA_PM_CAP		6

/* User defined EEPROM data */
#define EEPROM_DATA_OTHER_MAC_ADDR	9

/**
 * eeprom_read - read from AT93C46 EEPROM
 * @hw: 	The hardware instance.
 * @reg:	The register offset.
 *
 * This function reads a word from the AT93C46 EEPROM.
 *
 * Return the data value.
 */
static u16 eeprom_read(struct ksz_hw *hw, u8 reg)
{
	u16 data;

	raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

	spi_reg(hw, AT93C_READ, reg);
	data = spi_r(hw);

	drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

	return data;
}

/**
 * eeprom_write - write to AT93C46 EEPROM
 * @hw: 	The hardware instance.
 * @reg:	The register offset.
 * @data:	The data value.
 *
 * This procedure writes a word to the AT93C46 EEPROM.
 */
static void eeprom_write(struct ksz_hw *hw, u8 reg, u16 data)
{
	int timeout;

	raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);

	/* Enable write. */
	spi_reg(hw, AT93C_CODE, AT93C_WR_ON);
	drop_gpio(hw, EEPROM_CHIP_SELECT);
	udelay(1);

	/* Erase the register. */
	raise_gpio(hw, EEPROM_CHIP_SELECT);
	spi_reg(hw, AT93C_ERASE, reg);
	drop_gpio(hw, EEPROM_CHIP_SELECT);
	udelay(1);

	/* Check operation complete. */
	raise_gpio(hw, EEPROM_CHIP_SELECT);
	timeout = 8;
	mdelay(2);
	do {
		mdelay(1);
	} while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
	drop_gpio(hw, EEPROM_CHIP_SELECT);
	udelay(1);

	/* Write the register. */
	raise_gpio(hw, EEPROM_CHIP_SELECT);
	spi_reg(hw, AT93C_WRITE, reg);
	spi_w(hw, data);
	drop_gpio(hw, EEPROM_CHIP_SELECT);
	udelay(1);

	/* Check operation complete. */
	raise_gpio(hw, EEPROM_CHIP_SELECT);
	timeout = 8;
	mdelay(2);
	do {
		mdelay(1);
	} while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
	drop_gpio(hw, EEPROM_CHIP_SELECT);
	udelay(1);

	/* Disable write. */
	raise_gpio(hw, EEPROM_CHIP_SELECT);
	spi_reg(hw, AT93C_CODE, AT93C_WR_OFF);

	drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
}

/*
 * Link detection routines
 */

static u16 advertised_flow_ctrl(struct ksz_port *port, u16 ctrl)
{
	ctrl &= ~PORT_AUTO_NEG_SYM_PAUSE;
	switch (port->flow_ctrl) {
	case PHY_FLOW_CTRL:
		ctrl |= PORT_AUTO_NEG_SYM_PAUSE;
		break;
	/* Not supported. */
	case PHY_TX_ONLY:
	case PHY_RX_ONLY:
	default:
		break;
	}
	return ctrl;
}

static void set_flow_ctrl(struct ksz_hw *hw, int rx, int tx)
{
	u32 rx_cfg;
	u32 tx_cfg;

	rx_cfg = hw->rx_cfg;
	tx_cfg = hw->tx_cfg;
	if (rx)
		hw->rx_cfg |= DMA_RX_FLOW_ENABLE;
	else
		hw->rx_cfg &= ~DMA_RX_FLOW_ENABLE;
	if (tx)
		hw->tx_cfg |= DMA_TX_FLOW_ENABLE;
	else
		hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
	if (hw->enabled) {
		if (rx_cfg != hw->rx_cfg)
			writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
		if (tx_cfg != hw->tx_cfg)
			writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
	}
}

static void determine_flow_ctrl(struct ksz_hw *hw, struct ksz_port *port,
	u16 local, u16 remote)
{
	int rx;
	int tx;

	if (hw->overrides & PAUSE_FLOW_CTRL)
		return;

	rx = tx = 0;
	if (port->force_link)
		rx = tx = 1;
	if (remote & PHY_AUTO_NEG_SYM_PAUSE) {
		if (local & PHY_AUTO_NEG_SYM_PAUSE) {
			rx = tx = 1;
		} else if ((remote & PHY_AUTO_NEG_ASYM_PAUSE) &&
				(local & PHY_AUTO_NEG_PAUSE) ==
				PHY_AUTO_NEG_ASYM_PAUSE) {
			tx = 1;
		}
	} else if (remote & PHY_AUTO_NEG_ASYM_PAUSE) {
		if ((local & PHY_AUTO_NEG_PAUSE) == PHY_AUTO_NEG_PAUSE)
			rx = 1;
	}
	if (!hw->ksz_switch)
		set_flow_ctrl(hw, rx, tx);
}

static inline void port_cfg_change(struct ksz_hw *hw, struct ksz_port *port,
	struct ksz_port_info *info, u16 link_status)
{
	if ((hw->features & HALF_DUPLEX_SIGNAL_BUG) &&
			!(hw->overrides & PAUSE_FLOW_CTRL)) {
		u32 cfg = hw->tx_cfg;

		/* Disable flow control in the half duplex mode. */
		if (1 == info->duplex)
			hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
		if (hw->enabled && cfg != hw->tx_cfg)
			writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
	}
}

/**
 * port_get_link_speed - get current link status
 * @port: 	The port instance.
 *
 * This routine reads PHY registers to determine the current link status of the
 * switch ports.
 */
static void port_get_link_speed(struct ksz_port *port)
{
	uint interrupt;
	struct ksz_port_info *info;
	struct ksz_port_info *linked = NULL;
	struct ksz_hw *hw = port->hw;
	u16 data;
	u16 status;
	u8 local;
	u8 remote;
	int i;
	int p;
	int change = 0;

	interrupt = hw_block_intr(hw);

	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
		info = &hw->port_info[p];
		port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
		port_r16(hw, p, KS884X_PORT_STATUS_OFFSET, &status);

		/*
		 * Link status is changing all the time even when there is no
		 * cable connection!
		 */
		remote = status & (PORT_AUTO_NEG_COMPLETE |
			PORT_STATUS_LINK_GOOD);
		local = (u8) data;

		/* No change to status. */
		if (local == info->advertised && remote == info->partner)
			continue;

		info->advertised = local;
		info->partner = remote;
		if (status & PORT_STATUS_LINK_GOOD) {

			/* Remember the first linked port. */
			if (!linked)
				linked = info;

			info->tx_rate = 10 * TX_RATE_UNIT;
			if (status & PORT_STATUS_SPEED_100MBIT)
				info->tx_rate = 100 * TX_RATE_UNIT;

			info->duplex = 1;
			if (status & PORT_STATUS_FULL_DUPLEX)
				info->duplex = 2;

			if (media_connected != info->state) {
				hw_r_phy(hw, p, KS884X_PHY_AUTO_NEG_OFFSET,
					&data);
				hw_r_phy(hw, p, KS884X_PHY_REMOTE_CAP_OFFSET,
					&status);
				determine_flow_ctrl(hw, port, data, status);
				if (hw->ksz_switch) {
					port_cfg_back_pressure(hw, p,
						(1 == info->duplex));
				}
				change |= 1 << i;
				port_cfg_change(hw, port, info, status);
			}
			info->state = media_connected;
		} else {
			if (media_disconnected != info->state) {
				change |= 1 << i;

				/* Indicate the link just goes down. */
				hw->port_mib[p].link_down = 1;
			}
			info->state = media_disconnected;
		}
		hw->port_mib[p].state = (u8) info->state;
	}

	if (linked && media_disconnected == port->linked->state)
		port->linked = linked;

	hw_restore_intr(hw, interrupt);
}

#define PHY_RESET_TIMEOUT		10

/**
 * port_set_link_speed - set port speed
 * @port: 	The port instance.
 *
 * This routine sets the link speed of the switch ports.
 */
static void port_set_link_speed(struct ksz_port *port)
{
	struct ksz_port_info *info;
	struct ksz_hw *hw = port->hw;
	u16 data;
	u16 cfg;
	u8 status;
	int i;
	int p;

	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
		info = &hw->port_info[p];

		port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
		port_r8(hw, p, KS884X_PORT_STATUS_OFFSET, &status);

		cfg = 0;
		if (status & PORT_STATUS_LINK_GOOD)
			cfg = data;

		data |= PORT_AUTO_NEG_ENABLE;
		data = advertised_flow_ctrl(port, data);

		data |= PORT_AUTO_NEG_100BTX_FD | PORT_AUTO_NEG_100BTX |
			PORT_AUTO_NEG_10BT_FD | PORT_AUTO_NEG_10BT;

		/* Check if manual configuration is specified by the user. */
		if (port->speed || port->duplex) {
			if (10 == port->speed)
				data &= ~(PORT_AUTO_NEG_100BTX_FD |
					PORT_AUTO_NEG_100BTX);
			else if (100 == port->speed)
				data &= ~(PORT_AUTO_NEG_10BT_FD |
					PORT_AUTO_NEG_10BT);
			if (1 == port->duplex)
				data &= ~(PORT_AUTO_NEG_100BTX_FD |
					PORT_AUTO_NEG_10BT_FD);
			else if (2 == port->duplex)
				data &= ~(PORT_AUTO_NEG_100BTX |
					PORT_AUTO_NEG_10BT);
		}
		if (data != cfg) {
			data |= PORT_AUTO_NEG_RESTART;
			port_w16(hw, p, KS884X_PORT_CTRL_4_OFFSET, data);
		}
	}
}

/**
 * port_force_link_speed - force port speed
 * @port: 	The port instance.
 *
 * This routine forces the link speed of the switch ports.
 */
static void port_force_link_speed(struct ksz_port *port)
{
	struct ksz_hw *hw = port->hw;
	u16 data;
	int i;
	int phy;
	int p;

	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
		phy = KS884X_PHY_1_CTRL_OFFSET + p * PHY_CTRL_INTERVAL;
		hw_r_phy_ctrl(hw, phy, &data);

		data &= ~PHY_AUTO_NEG_ENABLE;

		if (10 == port->speed)
			data &= ~PHY_SPEED_100MBIT;
		else if (100 == port->speed)
			data |= PHY_SPEED_100MBIT;
		if (1 == port->duplex)
			data &= ~PHY_FULL_DUPLEX;
		else if (2 == port->duplex)
			data |= PHY_FULL_DUPLEX;
		hw_w_phy_ctrl(hw, phy, data);
	}