/**
 * 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/interrupt.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 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);
        }
}

static void port_set_power_saving(struct ksz_port *port, int enable)
{
        struct ksz_hw *hw = port->hw;
        int i;
        int p;

        for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++)
                port_cfg(hw, p,
                        KS884X_PORT_CTRL_4_OFFSET, PORT_POWER_DOWN, enable);
}

/*
 * KSZ8841 power management functions
 */

/**
 * hw_chk_wol_pme_status - check PMEN pin
 * @hw:         The hardware instance.
 *
 * This function is used to check PMEN pin is asserted.
 *
 * Return 1 if PMEN pin is asserted; otherwise, 0.
 */
static int hw_chk_wol_pme_status(struct ksz_hw *hw)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return 0;
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        return (data & PCI_PM_CTRL_PME_STATUS) == PCI_PM_CTRL_PME_STATUS;
}

/**
 * hw_clr_wol_pme_status - clear PMEN pin
 * @hw:         The hardware instance.
 *
 * This routine is used to clear PME_Status to deassert PMEN pin.
 */
static void hw_clr_wol_pme_status(struct ksz_hw *hw)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return;

        /* Clear PME_Status to deassert PMEN pin. */
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        data |= PCI_PM_CTRL_PME_STATUS;
        pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
}

/**
 * hw_cfg_wol_pme - enable or disable Wake-on-LAN
 * @hw:         The hardware instance.
 * @set:        The flag indicating whether to enable or disable.
 *
 * This routine is used to enable or disable Wake-on-LAN.
 */
static void hw_cfg_wol_pme(struct ksz_hw *hw, int set)
{
        struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
        struct pci_dev *pdev = hw_priv->pdev;
        u16 data;

        if (!pdev->pm_cap)
                return;
        pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
        data &= ~PCI_PM_CTRL_STATE_MASK;
        if (set)
                data |= PCI_PM_CTRL_PME_ENABLE | PCI_D3hot;
        else
                data &= ~PCI_PM_CTRL_PME_ENABLE;
        pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
}

/**
 * hw_cfg_wol - configure Wake-on-LAN features
 * @hw:         The hardware instance.
 * @frame:      The pattern frame bit.
 * @set:        The flag indicating whether to enable or disable.
 *
 * This routine is used to enable or disable certain Wake-on-LAN features.
 */
static void hw_cfg_wol(struct ksz_hw *hw, u16 frame, int set)
{
        u16 data;

        data = readw(hw->io + KS8841_WOL_CTRL_OFFSET);
        if (set)
                data |= frame;
        else
                data &= ~frame;
        writew(data, hw->io + KS8841_WOL_CTRL_OFFSET);
}

/**
 * hw_set_wol_frame - program Wake-on-LAN pattern
 * @hw:         The hardware instance.
 * @i:          The frame index.
 * @mask_size:  The size of the mask.
 * @mask:       Mask to ignore certain bytes in the pattern.
 * @frame_size: The size of the frame.
 * @pattern:    The frame data.
 *
 * This routine is used to program Wake-on-LAN pattern.
 */
static void hw_set_wol_frame(struct ksz_hw *hw, int i, uint mask_size,
        const u8 *mask, uint frame_size, const u8 *pattern)
{
        int bits;
        int from;
        int len;
        int to;
        u32 crc;
        u8 data[64];
        u8 val = 0;

        if (frame_size > mask_size * 8)
                frame_size = mask_size * 8;
        if (frame_size > 64)
                frame_size = 64;

        i *= 0x10;
        writel(0, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i);
        writel(0, hw->io + KS8841_WOL_FRAME_BYTE2_OFFSET + i);

        bits = len = from = to = 0;
        do {
                if (bits) {
                        if ((val & 1))
                                data[to++] = pattern[from];
                        val >>= 1;
                        ++from;
                        --bits;
                } else {
                        val = mask[len];
                        writeb(val, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i
                                + len);
                        ++len;
                        if (val)
                                bits = 8;
                        else
                                from += 8;
                }
        } while (from < (int) frame_size);
        if (val) {
                bits = mask[len - 1];
                val <<= (from % 8);
                bits &= ~val;
                writeb(bits, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i + len -
                        1);
        }
        crc = ether_crc(to, data);
        writel(crc, hw->io + KS8841_WOL_FRAME_CRC_OFFSET + i);
}

/**
 * hw_add_wol_arp - add ARP pattern
 * @hw:         The hardware instance.
 * @ip_addr:    The IPv4 address assigned to the device.
 *
 * This routine is used to add ARP pattern for waking up the host.
 */
static void hw_add_wol_arp(struct ksz_hw *hw, const u8 *ip_addr)
{
        static const u8 mask[6] = { 0x3F, 0xF0, 0x3F, 0x00, 0xC0, 0x03 };
        u8 pattern[42] = {
                0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x08, 0x06,
                0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00 };

        memcpy(&pattern[38], ip_addr, 4);
        hw_set_wol_frame(hw, 3, 6, mask, 42, pattern);
}

/**
 * hw_add_wol_bcast - add broadcast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add broadcast pattern for waking up the host.
 */
static void hw_add_wol_bcast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };
        static const u8 pattern[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

        hw_set_wol_frame(hw, 2, 1, mask, MAC_ADDR_LEN, pattern);
}

/**
 * hw_add_wol_mcast - add multicast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add multicast pattern for waking up the host.
 *
 * It is assumed the multicast packet is the ICMPv6 neighbor solicitation used
 * by IPv6 ping command.  Note that multicast packets are filtred through the
 * multicast hash table, so not all multicast packets can wake up the host.
 */
static void hw_add_wol_mcast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };
        u8 pattern[] = { 0x33, 0x33, 0xFF, 0x00, 0x00, 0x00 };

        memcpy(&pattern[3], &hw->override_addr[3], 3);
        hw_set_wol_frame(hw, 1, 1, mask, 6, pattern);
}

/**
 * hw_add_wol_ucast - add unicast pattern
 * @hw:         The hardware instance.
 *
 * This routine is used to add unicast pattern to wakeup the host.
 *
 * It is assumed the unicast packet is directed to the device, as the hardware
 * can only receive them in normal case.
 */
static void hw_add_wol_ucast(struct ksz_hw *hw)
{
        static const u8 mask[] = { 0x3F };

        hw_set_wol_frame(hw, 0, 1, mask, MAC_ADDR_LEN, hw->override_addr);
}

/**
 * hw_enable_wol - enable Wake-on-LAN
 * @hw:         The hardware instance.
 * @wol_enable: The Wake-on-LAN settings.
 * @net_addr:   The IPv4 address assigned to the device.
 *
 * This routine is used to enable Wake-on-LAN depending on driver settings.
 */
static void hw_enable_wol(struct ksz_hw *hw, u32 wol_enable, const u8 *net_addr)
{
        hw_cfg_wol(hw, KS8841_WOL_MAGIC_ENABLE, (wol_enable & WAKE_MAGIC));
        hw_cfg_wol(hw, KS8841_WOL_FRAME0_ENABLE, (wol_enable & WAKE_UCAST));
        hw_add_wol_ucast(hw);
        hw_cfg_wol(hw, KS8841_WOL_FRAME1_ENABLE, (wol_enable & WAKE_MCAST));
        hw_add_wol_mcast(hw);
        hw_cfg_wol(hw, KS8841_WOL_FRAME2_ENABLE, (wol_enable & WAKE_BCAST));
        hw_cfg_wol(hw, KS8841_WOL_FRAME3_ENABLE, (wol_enable & WAKE_ARP));
        hw_add_wol_arp(hw, net_addr);
}

/**
 * hw_init - check driver is correct for the hardware
 * @hw:         The hardware instance.
 *
 * This function checks the hardware is correct for this driver and sets the
 * hardware up for proper initialization.
 *
 * Return number of ports or 0 if not right.
 */
static int hw_init(struct ksz_hw *hw)
{
        int rc = 0;
        u16 data;
        u16 revision;

        /* Set bus speed to 125MHz. */
        writew(BUS_SPEED_125_MHZ, hw->io + KS884X_BUS_CTRL_OFFSET);

        /* Check KSZ884x chip ID. */
        data = readw(hw->io + KS884X_CHIP_ID_OFFSET);

        revision = (data & KS884X_REVISION_MASK) >> KS884X_REVISION_SHIFT;
        data &= KS884X_CHIP_ID_MASK_41;
        if (REG_CHIP_ID_41 == data)
                rc = 1;
        else if (REG_CHIP_ID_42 == data)
                rc = 2;
        else
                return 0;

        /* Setup hardware features or bug workarounds. */
        if (revision <= 1) {
                hw->features |= SMALL_PACKET_TX_BUG;
                if (1 == rc)
                        hw->features |= HALF_DUPLEX_SIGNAL_BUG;
        }
        return rc;
}

/**
 * hw_reset - reset the hardware
 * @hw:         The hardware instance.
 *
 * This routine resets the hardware.
 */
static void hw_reset(struct ksz_hw *hw)
{
        writew(GLOBAL_SOFTWARE_RESET, hw->io + KS884X_GLOBAL_CTRL_OFFSET);

        /* Wait for device to reset. */
        mdelay(10);

        /* Write 0 to clear device reset. */
        writew(0, hw->io + KS884X_GLOBAL_CTRL_OFFSET);
}

/**
 * hw_setup - setup the hardware
 * @hw:         The hardware instance.
 *
 * This routine setup the hardware for proper operation.
 */
static void hw_setup(struct ksz_hw *hw)
{
#if SET_DEFAULT_LED
        u16 data;

        /* Change default LED mode. */
        data = readw(hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
        data &= ~LED_MODE;
        data |= SET_DEFAULT_LED;
        writew(data, hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
#endif

        /* Setup transmit control. */
        hw->tx_cfg = (DMA_TX_PAD_ENABLE | DMA_TX_CRC_ENABLE |
                (DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_TX_ENABLE);

        /* Setup receive control. */
        hw->rx_cfg = (DMA_RX_BROADCAST | DMA_RX_UNICAST |
                (DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_RX_ENABLE);
        hw->rx_cfg |= KS884X_DMA_RX_MULTICAST;

        /* Hardware cannot handle UDP packet in IP fragments. */
        hw->rx_cfg |= (DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);

        if (hw->all_multi)
                hw->rx_cfg |= DMA_RX_ALL_MULTICAST;
        if (hw->promiscuous)
                hw->rx_cfg |= DMA_RX_PROMISCUOUS;
}

/**
 * hw_setup_intr - setup interrupt mask
 * @hw:         The hardware instance.
 *
 * This routine setup the interrupt mask for proper operation.
 */
static void hw_setup_intr(struct ksz_hw *hw)
{
        hw->intr_mask = KS884X_INT_MASK | KS884X_INT_RX_OVERRUN;
}

static void ksz_check_desc_num(struct ksz_desc_info *info)
{
#define MIN_DESC_SHIFT  2

        int alloc = info->alloc;
        int shift;

        shift = 0;
        while (!(alloc & 1)) {
                shift++;
                alloc >>= 1;
        }
        if (alloc != 1 || shift < MIN_DESC_SHIFT) {
                pr_alert("Hardware descriptor numbers not right!\n");
                while (alloc) {
                        shift++;
                        alloc >>= 1;
                }
                if (shift < MIN_DESC_SHIFT)
                        shift = MIN_DESC_SHIFT;
                alloc = 1 << shift;
                info->alloc = alloc;
        }
        info->mask = info->alloc - 1;
}

static void hw_init_desc(struct ksz_desc_info *desc_info, int transmit)
{
        int i;
        u32 phys = desc_info->ring_phys;
        struct ksz_hw_desc *desc = desc_info->ring_virt;
        struct ksz_desc *cur = desc_info->ring;
        struct ksz_desc *previous = NULL;

        for (i = 0; i < desc_info->alloc; i++) {
                cur->phw = desc++;
                phys += desc_info->size;
                previous = cur++;
                previous->phw->next = cpu_to_le32(phys);
        }
        previous->phw->next = cpu_to_le32(desc_info->ring_phys);
        previous->sw.buf.rx.end_of_ring = 1;
        previous->phw->buf.data = cpu_to_le32(previous->sw.buf.data);

        desc_info->avail = desc_info->alloc;
        desc_info->last = desc_info->next = 0;

        desc_info->cur = desc_info->ring;
}

/**
 * hw_set_desc_base - set descriptor base addresses
 * @hw:         The hardware instance.
 * @tx_addr:    The transmit descriptor base.
 * @rx_addr:    The receive descriptor base.
 *
 * This routine programs the descriptor base addresses after reset.
 */
static void hw_set_desc_base(struct ksz_hw *hw, u32 tx_addr, u32 rx_addr)
{
        /* Set base address of Tx/Rx descriptors. */
        writel(tx_addr, hw->io + KS_DMA_TX_ADDR);
        writel(rx_addr, hw->io + KS_DMA_RX_ADDR);
}

static void hw_reset_pkts(struct ksz_desc_info *info)
{
        info->cur = info->ring;
        info->avail = info->alloc;
        info->last = info->next = 0;
}

static inline void hw_resume_rx(struct ksz_hw *hw)
{
        writel(DMA_START, hw->io + KS_DMA_RX_START);
}

/**
 * hw_start_rx - start receiving
 * @hw:         The hardware instance.
 *
 * This routine starts the receive function of the hardware.
 */
static void hw_start_rx(struct ksz_hw *hw)
{
        writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);

        /* Notify when the receive stops. */
        hw->intr_mask |= KS884X_INT_RX_STOPPED;

        writel(DMA_START, hw->io + KS_DMA_RX_START);
        hw_ack_intr(hw, KS884X_INT_RX_STOPPED);
        hw->rx_stop++;

        /* Variable overflows. */
        if (0 == hw->rx_stop)
                hw->rx_stop = 2;
}

/*
 * hw_stop_rx - stop receiving
 * @hw:         The hardware instance.
 *
 * This routine stops the receive function of the hardware.
 */
static void hw_stop_rx(struct ksz_hw *hw)
{
        hw->rx_stop = 0;
        hw_turn_off_intr(hw, KS884X_INT_RX_STOPPED);
        writel((hw->rx_cfg & ~DMA_RX_ENABLE), hw->io + KS_DMA_RX_CTRL);
}

/**
 * hw_start_tx - start transmitting
 * @hw:         The hardware instance.
 *
 * This routine starts the transmit function of the hardware.
 */
static void hw_start_tx(struct ksz_hw *hw)
{
        writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
}

/**
 * hw_stop_tx - stop transmitting
 * @hw:         The hardware instance.
 *
 * This routine stops the transmit function of the hardware.
 */
static void hw_stop_tx(struct ksz_hw *hw)
{
        writel((hw->tx_cfg & ~DMA_TX_ENABLE), hw->io + KS_DMA_TX_CTRL);
}

/**
 * hw_disable - disable hardware
 * @hw:         The hardware instance.
 *
 * This routine disables the hardware.
 */
static void hw_disable(struct ksz_hw *hw)
{
        hw_stop_rx(hw);
        hw_stop_tx(hw);
        hw->enabled = 0;
}

/**
 * hw_enable - enable hardware
 * @hw:         The hardware instance.
 *
 * This routine enables the hardware.
 */
static void hw_enable(struct ksz_hw *hw)
{
        hw_start_tx(hw);
        hw_start_rx(hw);
        hw->enabled = 1;
}

/**
 * hw_alloc_pkt - allocate enough descriptors for transmission
 * @hw:         The hardware instance.
 * @length:     The length of the packet.
 * @physical:   Number of descriptors required.
 *
 * This function allocates descriptors for transmission.
 *
 * Return 0 if not successful; 1 for buffer copy; or number of descriptors.
 */
static int hw_alloc_pkt(struct ksz_hw *hw, int length, int physical)
{
        /* Always leave one descriptor free. */
        if (hw->tx_desc_info.avail <= 1)
                return 0;

        /* Allocate a descriptor for transmission and mark it current. */
        get_tx_pkt(&hw->tx_desc_info, &hw->tx_desc_info.cur);
        hw->tx_desc_info.cur->sw.buf.tx.first_seg = 1;

        /* Keep track of number of transmit descriptors used so far. */
        ++hw->tx_int_cnt;
        hw->tx_size += length;