drivers/net: ks8851_mll ethernet network driver

This is the first registration of ks8851 network driver with
MLL(address/data multiplexed) interface.

Signed-off-by : David J. Choi <david.choi@micrel.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 1705 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 2bea67c134f0..712776089b46 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1738,6 +1738,13 @@ config KS8851
        help
          SPI driver for Micrel KS8851 SPI attached network chip.
 
+config KS8851_MLL
+        tristate "Micrel KS8851 MLL"
+        depends on HAS_IOMEM
+        help
+          This platform driver is for Micrel KS8851 Address/data bus
+          multiplexed network chip.
+
 config VIA_RHINE
         tristate "VIA Rhine support"
         depends on NET_PCI && PCI
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index ae8cd30f13d6..d866b8cf65d1 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_SKY2) += sky2.o
 obj-$(CONFIG_SKFP) += skfp/
 obj-$(CONFIG_KS8842)    += ks8842.o
 obj-$(CONFIG_KS8851)    += ks8851.o
+obj-$(CONFIG_KS8851_MLL)        += ks8851_mll.o
 obj-$(CONFIG_VIA_RHINE) += via-rhine.o
 obj-$(CONFIG_VIA_VELOCITY) += via-velocity.o
 obj-$(CONFIG_ADAPTEC_STARFIRE) += starfire.o
diff --git a/drivers/net/ks8851_mll.c b/drivers/net/ks8851_mll.c
new file mode 100644
index 000000000000..0be14d702beb
--- /dev/null
+++ b/drivers/net/ks8851_mll.c
@@ -0,0 +1,1697 @@
+/**
+ * drivers/net/ks8851_mll.c
+ * Copyright (c) 2009 Micrel Inc.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/**
+ * Supports:
+ * KS8851 16bit MLL chip from Micrel Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/cache.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#define DRV_NAME        "ks8851_mll"
+
+static u8 KS_DEFAULT_MAC_ADDRESS[] = { 0x00, 0x10, 0xA1, 0x86, 0x95, 0x11 };
+#define MAX_RECV_FRAMES                 32
+#define MAX_BUF_SIZE                    2048
+#define TX_BUF_SIZE                     2000
+#define RX_BUF_SIZE                     2000
+
+#define KS_CCR                          0x08
+#define CCR_EEPROM                      (1 << 9)
+#define CCR_SPI                         (1 << 8)
+#define CCR_8BIT                        (1 << 7)
+#define CCR_16BIT                       (1 << 6)
+#define CCR_32BIT                       (1 << 5)
+#define CCR_SHARED                      (1 << 4)
+#define CCR_32PIN                       (1 << 0)
+
+/* MAC address registers */
+#define KS_MARL                         0x10
+#define KS_MARM                         0x12
+#define KS_MARH                         0x14
+
+#define KS_OBCR                         0x20
+#define OBCR_ODS_16MA                   (1 << 6)
+
+#define KS_EEPCR                        0x22
+#define EEPCR_EESA                      (1 << 4)
+#define EEPCR_EESB                      (1 << 3)
+#define EEPCR_EEDO                      (1 << 2)
+#define EEPCR_EESCK                     (1 << 1)
+#define EEPCR_EECS                      (1 << 0)
+
+#define KS_MBIR                         0x24
+#define MBIR_TXMBF                      (1 << 12)
+#define MBIR_TXMBFA                     (1 << 11)
+#define MBIR_RXMBF                      (1 << 4)
+#define MBIR_RXMBFA                     (1 << 3)
+
+#define KS_GRR                          0x26
+#define GRR_QMU                         (1 << 1)
+#define GRR_GSR                         (1 << 0)
+
+#define KS_WFCR                         0x2A
+#define WFCR_MPRXE                      (1 << 7)
+#define WFCR_WF3E                       (1 << 3)
+#define WFCR_WF2E                       (1 << 2)
+#define WFCR_WF1E                       (1 << 1)
+#define WFCR_WF0E                       (1 << 0)
+
+#define KS_WF0CRC0                      0x30
+#define KS_WF0CRC1                      0x32
+#define KS_WF0BM0                       0x34
+#define KS_WF0BM1                       0x36
+#define KS_WF0BM2                       0x38
+#define KS_WF0BM3                       0x3A
+
+#define KS_WF1CRC0                      0x40
+#define KS_WF1CRC1                      0x42
+#define KS_WF1BM0                       0x44
+#define KS_WF1BM1                       0x46
+#define KS_WF1BM2                       0x48
+#define KS_WF1BM3                       0x4A
+
+#define KS_WF2CRC0                      0x50
+#define KS_WF2CRC1                      0x52
+#define KS_WF2BM0                       0x54
+#define KS_WF2BM1                       0x56
+#define KS_WF2BM2                       0x58
+#define KS_WF2BM3                       0x5A
+
+#define KS_WF3CRC0                      0x60
+#define KS_WF3CRC1                      0x62
+#define KS_WF3BM0                       0x64
+#define KS_WF3BM1                       0x66
+#define KS_WF3BM2                       0x68
+#define KS_WF3BM3                       0x6A
+
+#define KS_TXCR                         0x70
+#define TXCR_TCGICMP                    (1 << 8)
+#define TXCR_TCGUDP                     (1 << 7)
+#define TXCR_TCGTCP                     (1 << 6)
+#define TXCR_TCGIP                      (1 << 5)
+#define TXCR_FTXQ                       (1 << 4)
+#define TXCR_TXFCE                      (1 << 3)
+#define TXCR_TXPE                       (1 << 2)
+#define TXCR_TXCRC                      (1 << 1)
+#define TXCR_TXE                        (1 << 0)
+
+#define KS_TXSR                         0x72
+#define TXSR_TXLC                       (1 << 13)
+#define TXSR_TXMC                       (1 << 12)
+#define TXSR_TXFID_MASK                 (0x3f << 0)
+#define TXSR_TXFID_SHIFT                (0)
+#define TXSR_TXFID_GET(_v)              (((_v) >> 0) & 0x3f)
+
+
+#define KS_RXCR1                        0x74
+#define RXCR1_FRXQ                      (1 << 15)
+#define RXCR1_RXUDPFCC                  (1 << 14)
+#define RXCR1_RXTCPFCC                  (1 << 13)
+#define RXCR1_RXIPFCC                   (1 << 12)
+#define RXCR1_RXPAFMA                   (1 << 11)
+#define RXCR1_RXFCE                     (1 << 10)
+#define RXCR1_RXEFE                     (1 << 9)
+#define RXCR1_RXMAFMA                   (1 << 8)
+#define RXCR1_RXBE                      (1 << 7)
+#define RXCR1_RXME                      (1 << 6)
+#define RXCR1_RXUE                      (1 << 5)
+#define RXCR1_RXAE                      (1 << 4)
+#define RXCR1_RXINVF                    (1 << 1)
+#define RXCR1_RXE                       (1 << 0)
+#define RXCR1_FILTER_MASK               (RXCR1_RXINVF | RXCR1_RXAE | \
+                                         RXCR1_RXMAFMA | RXCR1_RXPAFMA)
+
+#define KS_RXCR2                        0x76
+#define RXCR2_SRDBL_MASK                (0x7 << 5)
+#define RXCR2_SRDBL_SHIFT               (5)
+#define RXCR2_SRDBL_4B                  (0x0 << 5)
+#define RXCR2_SRDBL_8B                  (0x1 << 5)
+#define RXCR2_SRDBL_16B                 (0x2 << 5)
+#define RXCR2_SRDBL_32B                 (0x3 << 5)
+/* #define RXCR2_SRDBL_FRAME            (0x4 << 5) */
+#define RXCR2_IUFFP                     (1 << 4)
+#define RXCR2_RXIUFCEZ                  (1 << 3)
+#define RXCR2_UDPLFE                    (1 << 2)
+#define RXCR2_RXICMPFCC                 (1 << 1)
+#define RXCR2_RXSAF                     (1 << 0)
+
+#define KS_TXMIR                        0x78
+
+#define KS_RXFHSR                       0x7C
+#define RXFSHR_RXFV                     (1 << 15)
+#define RXFSHR_RXICMPFCS                (1 << 13)
+#define RXFSHR_RXIPFCS                  (1 << 12)
+#define RXFSHR_RXTCPFCS                 (1 << 11)
+#define RXFSHR_RXUDPFCS                 (1 << 10)
+#define RXFSHR_RXBF                     (1 << 7)
+#define RXFSHR_RXMF                     (1 << 6)
+#define RXFSHR_RXUF                     (1 << 5)
+#define RXFSHR_RXMR                     (1 << 4)
+#define RXFSHR_RXFT                     (1 << 3)
+#define RXFSHR_RXFTL                    (1 << 2)
+#define RXFSHR_RXRF                     (1 << 1)
+#define RXFSHR_RXCE                     (1 << 0)
+#define RXFSHR_ERR                      (RXFSHR_RXCE | RXFSHR_RXRF |\
+                                        RXFSHR_RXFTL | RXFSHR_RXMR |\
+                                        RXFSHR_RXICMPFCS | RXFSHR_RXIPFCS |\
+                                        RXFSHR_RXTCPFCS)
+#define KS_RXFHBCR                      0x7E
+#define RXFHBCR_CNT_MASK                0x0FFF
+
+#define KS_TXQCR                        0x80
+#define TXQCR_AETFE                     (1 << 2)
+#define TXQCR_TXQMAM                    (1 << 1)
+#define TXQCR_METFE                     (1 << 0)
+
+#define KS_RXQCR                        0x82
+#define RXQCR_RXDTTS                    (1 << 12)
+#define RXQCR_RXDBCTS                   (1 << 11)
+#define RXQCR_RXFCTS                    (1 << 10)
+#define RXQCR_RXIPHTOE                  (1 << 9)
+#define RXQCR_RXDTTE                    (1 << 7)
+#define RXQCR_RXDBCTE                   (1 << 6)
+#define RXQCR_RXFCTE                    (1 << 5)
+#define RXQCR_ADRFE                     (1 << 4)
+#define RXQCR_SDA                       (1 << 3)
+#define RXQCR_RRXEF                     (1 << 0)
+#define RXQCR_CMD_CNTL                  (RXQCR_RXFCTE|RXQCR_ADRFE)
+
+#define KS_TXFDPR                       0x84
+#define TXFDPR_TXFPAI                   (1 << 14)
+#define TXFDPR_TXFP_MASK                (0x7ff << 0)
+#define TXFDPR_TXFP_SHIFT               (0)
+
+#define KS_RXFDPR                       0x86
+#define RXFDPR_RXFPAI                   (1 << 14)
+
+#define KS_RXDTTR                       0x8C
+#define KS_RXDBCTR                      0x8E
+
+#define KS_IER                          0x90
+#define KS_ISR                          0x92
+#define IRQ_LCI                         (1 << 15)
+#define IRQ_TXI                         (1 << 14)
+#define IRQ_RXI                         (1 << 13)
+#define IRQ_RXOI                        (1 << 11)
+#define IRQ_TXPSI                       (1 << 9)
+#define IRQ_RXPSI                       (1 << 8)
+#define IRQ_TXSAI                       (1 << 6)
+#define IRQ_RXWFDI                      (1 << 5)
+#define IRQ_RXMPDI                      (1 << 4)
+#define IRQ_LDI                         (1 << 3)
+#define IRQ_EDI                         (1 << 2)
+#define IRQ_SPIBEI                      (1 << 1)
+#define IRQ_DEDI                        (1 << 0)
+
+#define KS_RXFCTR                       0x9C
+#define RXFCTR_THRESHOLD_MASK           0x00FF
+
+#define KS_RXFC                         0x9D
+#define RXFCTR_RXFC_MASK                (0xff << 8)
+#define RXFCTR_RXFC_SHIFT               (8)
+#define RXFCTR_RXFC_GET(_v)             (((_v) >> 8) & 0xff)
+#define RXFCTR_RXFCT_MASK               (0xff << 0)
+#define RXFCTR_RXFCT_SHIFT              (0)
+
+#define KS_TXNTFSR                      0x9E
+
+#define KS_MAHTR0                       0xA0
+#define KS_MAHTR1                       0xA2
+#define KS_MAHTR2                       0xA4
+#define KS_MAHTR3                       0xA6
+
+#define KS_FCLWR                        0xB0
+#define KS_FCHWR                        0xB2
+#define KS_FCOWR                        0xB4
+
+#define KS_CIDER                        0xC0
+#define CIDER_ID                        0x8870
+#define CIDER_REV_MASK                  (0x7 << 1)
+#define CIDER_REV_SHIFT                 (1)
+#define CIDER_REV_GET(_v)               (((_v) >> 1) & 0x7)
+
+#define KS_CGCR                         0xC6
+#define KS_IACR                         0xC8
+#define IACR_RDEN                       (1 << 12)
+#define IACR_TSEL_MASK                  (0x3 << 10)
+#define IACR_TSEL_SHIFT                 (10)
+#define IACR_TSEL_MIB                   (0x3 << 10)
+#define IACR_ADDR_MASK                  (0x1f << 0)
+#define IACR_ADDR_SHIFT                 (0)
+
+#define KS_IADLR                        0xD0
+#define KS_IAHDR                        0xD2
+
+#define KS_PMECR                        0xD4
+#define PMECR_PME_DELAY                 (1 << 14)
+#define PMECR_PME_POL                   (1 << 12)
+#define PMECR_WOL_WAKEUP                (1 << 11)
+#define PMECR_WOL_MAGICPKT              (1 << 10)
+#define PMECR_WOL_LINKUP                (1 << 9)
+#define PMECR_WOL_ENERGY                (1 << 8)
+#define PMECR_AUTO_WAKE_EN              (1 << 7)
+#define PMECR_WAKEUP_NORMAL             (1 << 6)
+#define PMECR_WKEVT_MASK                (0xf << 2)
+#define PMECR_WKEVT_SHIFT               (2)
+#define PMECR_WKEVT_GET(_v)             (((_v) >> 2) & 0xf)
+#define PMECR_WKEVT_ENERGY              (0x1 << 2)
+#define PMECR_WKEVT_LINK                (0x2 << 2)
+#define PMECR_WKEVT_MAGICPKT            (0x4 << 2)
+#define PMECR_WKEVT_FRAME               (0x8 << 2)
+#define PMECR_PM_MASK                   (0x3 << 0)
+#define PMECR_PM_SHIFT                  (0)
+#define PMECR_PM_NORMAL                 (0x0 << 0)
+#define PMECR_PM_ENERGY                 (0x1 << 0)
+#define PMECR_PM_SOFTDOWN               (0x2 << 0)
+#define PMECR_PM_POWERSAVE              (0x3 << 0)
+
+/* Standard MII PHY data */
+#define KS_P1MBCR                       0xE4
+#define P1MBCR_FORCE_FDX                (1 << 8)
+
+#define KS_P1MBSR                       0xE6
+#define P1MBSR_AN_COMPLETE              (1 << 5)
+#define P1MBSR_AN_CAPABLE               (1 << 3)
+#define P1MBSR_LINK_UP                  (1 << 2)
+
+#define KS_PHY1ILR                      0xE8
+#define KS_PHY1IHR                      0xEA
+#define KS_P1ANAR                       0xEC
+#define KS_P1ANLPR                      0xEE
+
+#define KS_P1SCLMD                      0xF4
+#define P1SCLMD_LEDOFF                  (1 << 15)
+#define P1SCLMD_TXIDS                   (1 << 14)
+#define P1SCLMD_RESTARTAN               (1 << 13)
+#define P1SCLMD_DISAUTOMDIX             (1 << 10)
+#define P1SCLMD_FORCEMDIX               (1 << 9)
+#define P1SCLMD_AUTONEGEN               (1 << 7)
+#define P1SCLMD_FORCE100                (1 << 6)
+#define P1SCLMD_FORCEFDX                (1 << 5)
+#define P1SCLMD_ADV_FLOW                (1 << 4)
+#define P1SCLMD_ADV_100BT_FDX           (1 << 3)
+#define P1SCLMD_ADV_100BT_HDX           (1 << 2)
+#define P1SCLMD_ADV_10BT_FDX            (1 << 1)
+#define P1SCLMD_ADV_10BT_HDX            (1 << 0)
+
+#define KS_P1CR                         0xF6
+#define P1CR_HP_MDIX                    (1 << 15)
+#define P1CR_REV_POL                    (1 << 13)
+#define P1CR_OP_100M                    (1 << 10)
+#define P1CR_OP_FDX                     (1 << 9)
+#define P1CR_OP_MDI                     (1 << 7)
+#define P1CR_AN_DONE                    (1 << 6)
+#define P1CR_LINK_GOOD                  (1 << 5)
+#define P1CR_PNTR_FLOW                  (1 << 4)
+#define P1CR_PNTR_100BT_FDX             (1 << 3)
+#define P1CR_PNTR_100BT_HDX             (1 << 2)
+#define P1CR_PNTR_10BT_FDX              (1 << 1)
+#define P1CR_PNTR_10BT_HDX              (1 << 0)
+
+/* TX Frame control */
+
+#define TXFR_TXIC                       (1 << 15)
+#define TXFR_TXFID_MASK                 (0x3f << 0)
+#define TXFR_TXFID_SHIFT                (0)
+
+#define KS_P1SR                         0xF8
+#define P1SR_HP_MDIX                    (1 << 15)
+#define P1SR_REV_POL                    (1 << 13)
+#define P1SR_OP_100M                    (1 << 10)
+#define P1SR_OP_FDX                     (1 << 9)
+#define P1SR_OP_MDI                     (1 << 7)
+#define P1SR_AN_DONE                    (1 << 6)
+#define P1SR_LINK_GOOD                  (1 << 5)
+#define P1SR_PNTR_FLOW                  (1 << 4)
+#define P1SR_PNTR_100BT_FDX             (1 << 3)
+#define P1SR_PNTR_100BT_HDX             (1 << 2)
+#define P1SR_PNTR_10BT_FDX              (1 << 1)
+#define P1SR_PNTR_10BT_HDX              (1 << 0)
+
+#define ENUM_BUS_NONE                   0
+#define ENUM_BUS_8BIT                   1
+#define ENUM_BUS_16BIT                  2
+#define ENUM_BUS_32BIT                  3
+
+#define MAX_MCAST_LST                   32
+#define HW_MCAST_SIZE                   8
+#define MAC_ADDR_LEN                    6
+
+/**
+ * union ks_tx_hdr - tx header data
+ * @txb: The header as bytes
+ * @txw: The header as 16bit, little-endian words
+ *
+ * A dual representation of the tx header data to allow
+ * access to individual bytes, and to allow 16bit accesses
+ * with 16bit alignment.
+ */
+union ks_tx_hdr {
+        u8      txb[4];
+        __le16  txw[2];
+};
+
+/**
+ * struct ks_net - KS8851 driver private data
+ * @net_device  : The network device we're bound to
+ * @hw_addr     : start address of data register.
+ * @hw_addr_cmd : start address of command register.
+ * @txh         : temporaly buffer to save status/length.
+ * @lock        : Lock to ensure that the device is not accessed when busy.
+ * @pdev        : Pointer to platform device.
+ * @mii         : The MII state information for the mii calls.
+ * @frame_head_info     : frame header information for multi-pkt rx.
+ * @statelock   : Lock on this structure for tx list.
+ * @msg_enable  : The message flags controlling driver output (see ethtool).
+ * @frame_cnt   : number of frames received.
+ * @bus_width   : i/o bus width.
+ * @irq         : irq number assigned to this device.
+ * @rc_rxqcr    : Cached copy of KS_RXQCR.
+ * @rc_txcr     : Cached copy of KS_TXCR.
+ * @rc_ier      : Cached copy of KS_IER.
+ * @sharedbus   : Multipex(addr and data bus) mode indicator.
+ * @cmd_reg_cache       : command register cached.
+ * @cmd_reg_cache_int   : command register cached. Used in the irq handler.
+ * @promiscuous : promiscuous mode indicator.
+ * @all_mcast   : mutlicast indicator.
+ * @mcast_lst_size      : size of multicast list.
+ * @mcast_lst           : multicast list.
+ * @mcast_bits          : multicast enabed.
+ * @mac_addr            : MAC address assigned to this device.
+ * @fid                 : frame id.
+ * @extra_byte          : number of extra byte prepended rx pkt.
+ * @enabled             : indicator this device works.
+ *
+ * The @lock ensures that the chip is protected when certain operations are
+ * in progress. When the read or write packet transfer is in progress, most
+ * of the chip registers are not accessible until the transfer is finished and
+ * the DMA has been de-asserted.
+ *
+ * The @statelock is used to protect information in the structure which may
+ * need to be accessed via several sources, such as the network driver layer
+ * or one of the work queues.
+ *
+ */
+
+/* Receive multiplex framer header info */
+struct type_frame_head {
+        u16     sts;         /* Frame status */
+        u16     len;         /* Byte count */
+};
+
+struct ks_net {
+        struct net_device       *netdev;
+        void __iomem            *hw_addr;
+        void __iomem            *hw_addr_cmd;
+        union ks_tx_hdr         txh ____cacheline_aligned;
+        struct mutex            lock; /* spinlock to be interrupt safe */
+        struct platform_device *pdev;
+        struct mii_if_info      mii;
+        struct type_frame_head  *frame_head_info;
+        spinlock_t              statelock;
+        u32                     msg_enable;
+        u32                     frame_cnt;
+        int                     bus_width;
+        int                     irq;
+
+        u16                     rc_rxqcr;
+        u16                     rc_txcr;
+        u16                     rc_ier;
+        u16                     sharedbus;
+        u16                     cmd_reg_cache;
+        u16                     cmd_reg_cache_int;
+        u16                     promiscuous;
+        u16                     all_mcast;
+        u16                     mcast_lst_size;
+        u8                      mcast_lst[MAX_MCAST_LST][MAC_ADDR_LEN];
+        u8                      mcast_bits[HW_MCAST_SIZE];
+        u8                      mac_addr[6];
+        u8                      fid;
+        u8                      extra_byte;
+        u8                      enabled;
+};
+
+static int msg_enable;
+
+#define ks_info(_ks, _msg...) dev_info(&(_ks)->pdev->dev, _msg)
+#define ks_warn(_ks, _msg...) dev_warn(&(_ks)->pdev->dev, _msg)
+#define ks_dbg(_ks, _msg...) dev_dbg(&(_ks)->pdev->dev, _msg)
+#define ks_err(_ks, _msg...) dev_err(&(_ks)->pdev->dev, _msg)
+
+#define BE3             0x8000      /* Byte Enable 3 */
+#define BE2             0x4000      /* Byte Enable 2 */
+#define BE1             0x2000      /* Byte Enable 1 */
+#define BE0             0x1000      /* Byte Enable 0 */
+
+/**
+ * register read/write calls.
+ *
+ * All these calls issue transactions to access the chip's registers. They
+ * all require that the necessary lock is held to prevent accesses when the
+ * chip is busy transfering packet data (RX/TX FIFO accesses).
+ */
+
+/**
+ * ks_rdreg8 - read 8 bit register from device
+ * @ks    : The chip information
+ * @offset: The register address
+ *
+ * Read a 8bit register from the chip, returning the result
+ */
+static u8 ks_rdreg8(struct ks_net *ks, int offset)
+{
+        u16 data;
+        u8 shift_bit = offset & 0x03;
+        u8 shift_data = (offset & 1) << 3;
+        ks->cmd_reg_cache = (u16) offset | (u16)(BE0 << shift_bit);
+        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
+        data  = ioread16(ks->hw_addr);
+        return (u8)(data >> shift_data);
+}
+
+/**
+ * ks_rdreg16 - read 16 bit register from device
+ * @ks    : The chip information
+ * @offset: The register address
+ *
+ * Read a 16bit register from the chip, returning the result
+ */
+
+static u16 ks_rdreg16(struct ks_net *ks, int offset)
+{
+        ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
+        return ioread16(ks->hw_addr);
+}
+
+/**
+ * ks_wrreg8 - write 8bit register value to chip
+ * @ks: The chip information
+ * @offset: The register address
+ * @value: The value to write
+ *
+ */
+static void ks_wrreg8(struct ks_net *ks, int offset, u8 value)
+{
+        u8  shift_bit = (offset & 0x03);
+        u16 value_write = (u16)(value << ((offset & 1) << 3));
+        ks->cmd_reg_cache = (u16)offset | (BE0 << shift_bit);
+        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
+        iowrite16(value_write, ks->hw_addr);
+}
+
+/**
+ * ks_wrreg16 - write 16bit register value to chip
+ * @ks: The chip information
+ * @offset: The register address
+ * @value: The value to write
+ *
+ */
+
+static void ks_wrreg16(struct ks_net *ks, int offset, u16 value)
+{
+        ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
+        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
+        iowrite16(value, ks->hw_addr);
+}
+
+/**
+ * ks_inblk - read a block of data from QMU. This is called after sudo DMA mode enabled.
+ * @ks: The chip state
+ * @wptr: buffer address to save data
+ * @len: length in byte to read
+ *
+ */
+static inline void ks_inblk(struct ks_net *ks, u16 *wptr, u32 len)
+{
+        len >>= 1;
+        while (len--)
+                *wptr++ = (u16)ioread16(ks->hw_addr);
+}
+
+/**
+ * ks_outblk - write data to QMU. This is called after sudo DMA mode enabled.
+ * @ks: The chip information
+ * @wptr: buffer address
+ * @len: length in byte to write
+ *
+ */
+static inline void ks_outblk(struct ks_net *ks, u16 *wptr, u32 len)
+{
+        len >>= 1;
+        while (len--)
+                iowrite16(*wptr++, ks->hw_addr);
+}
+
+/**
+ * ks_tx_fifo_space - return the available hardware buffer size.
+ * @ks: The chip information
+ *
+ */
+static inline u16 ks_tx_fifo_space(struct ks_net *ks)
+{
+        return ks_rdreg16(ks, KS_TXMIR) & 0x1fff;
+}
+
+/**
+ * ks_save_cmd_reg - save the command register from the cache.
+ * @ks: The chip information
+ *
+ */
+static inline void ks_save_cmd_reg(struct ks_net *ks)
+{
+        /*ks8851 MLL has a bug to read back the command register.
+        * So rely on software to save the content of command register.
+        */
+        ks->cmd_reg_cache_int = ks->cmd_reg_cache;
+}
+
+/**
+ * ks_restore_cmd_reg - restore the command register from the cache and
+ *      write to hardware register.
+ * @ks: The chip information
+ *
+ */
+static inline void ks_restore_cmd_reg(struct ks_net *ks)
+{
+        ks->cmd_reg_cache = ks->cmd_reg_cache_int;
+        iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
+}
+
+/**
+ * ks_set_powermode - set power mode of the device
+ * @ks: The chip information
+ * @pwrmode: The power mode value to write to KS_PMECR.
+ *
+ * Change the power mode of the chip.
+ */
+static void ks_set_powermode(struct ks_net *ks, unsigned pwrmode)
+{
+        unsigned pmecr;
+
+        if (netif_msg_hw(ks))
+                ks_dbg(ks, "setting power mode %d\n", pwrmode);
+
+        ks_rdreg16(ks, KS_GRR);
+        pmecr = ks_rdreg16(ks, KS_PMECR);
+        pmecr &= ~PMECR_PM_MASK;
+        pmecr |= pwrmode;
+
+        ks_wrreg16(ks, KS_PMECR, pmecr);
+}
+
+/**
+ * ks_read_config - read chip configuration of bus width.
+ * @ks: The chip information
+ *
+ */
+static void ks_read_config(struct ks_net *ks)
+{
+        u16 reg_data = 0;
+
+        /* Regardless of bus width, 8 bit read should always work.*/
+        reg_data = ks_rdreg8(ks, KS_CCR) & 0x00FF;
+        reg_data |= ks_rdreg8(ks, KS_CCR+1) << 8;
+
+        /* addr/data bus are multiplexed */
+        ks->sharedbus = (reg_data & CCR_SHARED) == CCR_SHARED;
+
+        /* There are garbage data when reading data from QMU,
+        depending on bus-width.
+        */
+
+        if (reg_data & CCR_8BIT) {
+                ks->bus_width = ENUM_BUS_8BIT;
+                ks->extra_byte = 1;
+        } else if (reg_data & CCR_16BIT) {
+                ks->bus_width = ENUM_BUS_16BIT;
+                ks->extra_byte = 2;
+        } else {
+                ks->bus_width = ENUM_BUS_32BIT;
+                ks->extra_byte = 4;
+        }
+}
+
+/**
+ * ks_soft_reset - issue one of the soft reset to the device
+ * @ks: The device state.
+ * @op: The bit(s) to set in the GRR
+ *
+ * Issue the relevant soft-reset command to the device's GRR register
+ * specified by @op.
+ *
+ * Note, the delays are in there as a caution to ensure that the reset
+ * has time to take effect and then complete. Since the datasheet does
+ * not currently specify the exact sequence, we have chosen something
+ * that seems to work with our device.
+ */
+static void ks_soft_reset(struct ks_net *ks, unsigned op)
+{
+        /* Disable interrupt first */
+        ks_wrreg16(ks, KS_IER, 0x0000);
+        ks_wrreg16(ks, KS_GRR, op);
+        mdelay(10);     /* wait a short time to effect reset */
+        ks_wrreg16(ks, KS_GRR, 0);
+        mdelay(1);      /* wait for condition to clear */
+}
+
+
+/**
+ * ks_read_qmu - read 1 pkt data from the QMU.
+ * @ks: The chip information
+ * @buf: buffer address to save 1 pkt
+ * @len: Pkt length
+ * Here is the sequence to read 1 pkt:
+ *      1. set sudo DMA mode
+ *      2. read prepend data
+ *      3. read pkt data
+ *      4. reset sudo DMA Mode
+ */
+static inline void ks_read_qmu(struct ks_net *ks, u16 *buf, u32 len)
+{
+        u32 r =  ks->extra_byte & 0x1 ;
+        u32 w = ks->extra_byte - r;
+
+        /* 1. set sudo DMA mode */
+        ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
+        ks_wrreg8(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_SDA) & 0xff);
+
+        /* 2. read prepend data */
+        /**
+         * read 4 + extra bytes and discard them.
+         * extra bytes for dummy, 2 for status, 2 for len
+         */
+
+        /* use likely(r) for 8 bit access for performance */
+        if (unlikely(r))
+                ioread8(ks->hw_addr);
+        ks_inblk(ks, buf, w + 2 + 2);
+
+        /* 3. read pkt data */
+        ks_inblk(ks, buf, ALIGN(len, 4));
+
+        /* 4. reset sudo DMA Mode */
+        ks_wrreg8(ks, KS_RXQCR, ks->rc_rxqcr);
+}
+
+/**
+ * ks_rcv - read multiple pkts data from the QMU.
+ * @ks: The chip information
+ * @netdev: The network device being opened.
+ *
+ * Read all of header information before reading pkt content.
+ * It is not allowed only port of pkts in QMU after issuing
+ * interrupt ack.
+ */
+static void ks_rcv(struct ks_net *ks, struct net_device *netdev)
+{
+        u32     i;
+        struct type_frame_head *frame_hdr = ks->frame_head_info;
+        struct sk_buff *skb;
+
+        ks->frame_cnt = ks_rdreg16(ks, KS_RXFCTR) >> 8;
+
+        /* read all header information */
+        for (i = 0; i < ks->frame_cnt; i++) {
+                /* Checking Received packet status */
+                frame_hdr->sts = ks_rdreg16(ks, KS_RXFHSR);
+                /* Get packet len from hardware */
+                frame_hdr->len = ks_rdreg16(ks, KS_RXFHBCR);
+                frame_hdr++;
+        }
+
+        frame_hdr = ks->frame_head_info;
+        while (ks->frame_cnt--) {
+                skb = dev_alloc_skb(frame_hdr->len + 16);
+                if (likely(skb && (frame_hdr->sts & RXFSHR_RXFV) &&
+                        (frame_hdr->len < RX_BUF_SIZE) && frame_hdr->len)) {
+                        skb_reserve(skb, 2);
+                        /* read data block including CRC 4 bytes */
+                        ks_read_qmu(ks, (u16 *)skb->data, frame_hdr->len + 4);
+                        skb_put(skb, frame_hdr->len);
+                        skb->dev = netdev;
+                        skb->protocol = eth_type_trans(skb, netdev);
+                        netif_rx(skb);
+                } else {
+                        printk(KERN_ERR "%s: err:skb alloc\n", __func__);
+                        ks_wrreg16(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_RRXEF));
+                        if (skb)
+                                dev_kfree_skb_irq(skb);
+                }
+                frame_hdr++;
+        }
+}
+
+/**
+ * ks_update_link_status - link status update.
+ * @netdev: The network device being opened.
+ * @ks: The chip information
+ *
+ */
+
+static void ks_update_link_status(struct net_device *netdev, struct ks_net *ks)
+{
+        /* check the status of the link */
+        u32 link_up_status;
+        if (ks_rdreg16(ks, KS_P1SR) & P1SR_LINK_GOOD) {
+                netif_carrier_on(netdev);
+                link_up_status = true;
+        } else {
+                netif_carrier_off(netdev);
+                link_up_status = false;
+        }
+        if (netif_msg_link(ks))
+                ks_dbg(ks, "%s: %s\n",
+                        __func__, link_up_status ? "UP" : "DOWN");
+}
+
+/**
+ * ks_irq - device interrupt handler
+ * @irq: Interrupt number passed from the IRQ hnalder.
+ * @pw: The private word passed to register_irq(), our struct ks_net.
+ *
+ * This is the handler invoked to find out what happened
+ *
+ * Read the interrupt status, work out what needs to be done and then clear
+ * any of the interrupts that are not needed.
+ */
+
+static irqreturn_t ks_irq(int irq, void *pw)
+{
+        struct ks_net *ks = pw;
+        struct net_device *netdev = ks->netdev;
+        u16 status;
+
+        /*this should be the first in IRQ handler */
+        ks_save_cmd_reg(ks);
+
+        status = ks_rdreg16(ks, KS_ISR);
+        if (unlikely(!status)) {
+                ks_restore_cmd_reg(ks);
+                return IRQ_NONE;
+        }
+
+        ks_wrreg16(ks, KS_ISR, status);
+
+        if (likely(status & IRQ_RXI))
+                ks_rcv(ks, netdev);
+
+        if (unlikely(status & IRQ_LCI))
+                ks_update_link_status(netdev, ks);
+
+        if (unlikely(status & IRQ_TXI))
+                netif_wake_queue(netdev);
+
+        if (unlikely(status & IRQ_LDI)) {
+
+                u16 pmecr = ks_rdreg16(ks, KS_PMECR);
+                pmecr &= ~PMECR_WKEVT_MASK;
+                ks_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
+        }
+
+        /* this should be the last in IRQ handler*/
+        ks_restore_cmd_reg(ks);
+        return IRQ_HANDLED;
+}
+
+
+/**
+ * ks_net_open - open network device
+ * @netdev: The network device being opened.
+ *
+ * Called when the network device is marked active, such as a user executing
+ * 'ifconfig up' on the device.
+ */
+static int ks_net_open(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        int err;
+
+#define KS_INT_FLAGS    (IRQF_DISABLED|IRQF_TRIGGER_LOW)
+        /* lock the card, even if we may not actually do anything
+         * else at the moment.
+         */
+
+        if (netif_msg_ifup(ks))
+                ks_dbg(ks, "%s - entry\n", __func__);
+
+        /* reset the HW */
+        err = request_irq(ks->irq, ks_irq, KS_INT_FLAGS, DRV_NAME, ks);
+
+        if (err) {
+                printk(KERN_ERR "Failed to request IRQ: %d: %d\n",
+                        ks->irq, err);
+                return err;
+        }
+
+        if (netif_msg_ifup(ks))
+                ks_dbg(ks, "network device %s up\n", netdev->name);
+
+        return 0;
+}
+
+/**
+ * ks_net_stop - close network device
+ * @netdev: The device being closed.
+ *
+ * Called to close down a network device which has been active. Cancell any
+ * work, shutdown the RX and TX process and then place the chip into a low
+ * power state whilst it is not being used.
+ */
+static int ks_net_stop(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+
+        if (netif_msg_ifdown(ks))
+                ks_info(ks, "%s: shutting down\n", netdev->name);
+
+        netif_stop_queue(netdev);
+
+        kfree(ks->frame_head_info);
+
+        mutex_lock(&ks->lock);
+
+        /* turn off the IRQs and ack any outstanding */
+        ks_wrreg16(ks, KS_IER, 0x0000);
+        ks_wrreg16(ks, KS_ISR, 0xffff);
+
+        /* shutdown RX process */
+        ks_wrreg16(ks, KS_RXCR1, 0x0000);
+
+        /* shutdown TX process */
+        ks_wrreg16(ks, KS_TXCR, 0x0000);
+
+        /* set powermode to soft power down to save power */
+        ks_set_powermode(ks, PMECR_PM_SOFTDOWN);
+        free_irq(ks->irq, netdev);
+        mutex_unlock(&ks->lock);
+        return 0;
+}
+
+
+/**
+ * ks_write_qmu - write 1 pkt data to the QMU.
+ * @ks: The chip information
+ * @pdata: buffer address to save 1 pkt
+ * @len: Pkt length in byte
+ * Here is the sequence to write 1 pkt:
+ *      1. set sudo DMA mode
+ *      2. write status/length
+ *      3. write pkt data
+ *      4. reset sudo DMA Mode
+ *      5. reset sudo DMA mode
+ *      6. Wait until pkt is out
+ */
+static void ks_write_qmu(struct ks_net *ks, u8 *pdata, u16 len)
+{
+        unsigned fid = ks->fid;
+
+        fid = ks->fid;
+        ks->fid = (ks->fid + 1) & TXFR_TXFID_MASK;
+
+        /* reduce the tx interrupt occurrances. */
+        if (!fid)
+                fid |= TXFR_TXIC;       /* irq on completion */
+
+        /* start header at txb[0] to align txw entries */
+        ks->txh.txw[0] = cpu_to_le16(fid);
+        ks->txh.txw[1] = cpu_to_le16(len);
+
+        /* 1. set sudo-DMA mode */
+        ks_wrreg8(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_SDA) & 0xff);
+        /* 2. write status/lenth info */
+        ks_outblk(ks, ks->txh.txw, 4);
+        /* 3. write pkt data */
+        ks_outblk(ks, (u16 *)pdata, ALIGN(len, 4));
+        /* 4. reset sudo-DMA mode */
+        ks_wrreg8(ks, KS_RXQCR, ks->rc_rxqcr);
+        /* 5. Enqueue Tx(move the pkt from TX buffer into TXQ) */
+        ks_wrreg16(ks, KS_TXQCR, TXQCR_METFE);
+        /* 6. wait until TXQCR_METFE is auto-cleared */
+        while (ks_rdreg16(ks, KS_TXQCR) & TXQCR_METFE)
+                ;
+}
+
+static void ks_disable_int(struct ks_net *ks)
+{
+        ks_wrreg16(ks, KS_IER, 0x0000);
+}  /* ks_disable_int */
+
+static void ks_enable_int(struct ks_net *ks)
+{
+        ks_wrreg16(ks, KS_IER, ks->rc_ier);
+}  /* ks_enable_int */
+
+/**
+ * ks_start_xmit - transmit packet
+ * @skb         : The buffer to transmit
+ * @netdev      : The device used to transmit the packet.
+ *
+ * Called by the network layer to transmit the @skb.
+ * spin_lock_irqsave is required because tx and rx should be mutual exclusive.
+ * So while tx is in-progress, prevent IRQ interrupt from happenning.
+ */
+static int ks_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+        int retv = NETDEV_TX_OK;
+        struct ks_net *ks = netdev_priv(netdev);
+
+        disable_irq(netdev->irq);
+        ks_disable_int(ks);
+        spin_lock(&ks->statelock);
+
+        /* Extra space are required:
+        *  4 byte for alignment, 4 for status/length, 4 for CRC
+        */
+
+        if (likely(ks_tx_fifo_space(ks) >= skb->len + 12)) {
+                ks_write_qmu(ks, skb->data, skb->len);
+                dev_kfree_skb(skb);
+        } else
+                retv = NETDEV_TX_BUSY;
+        spin_unlock(&ks->statelock);
+        ks_enable_int(ks);
+        enable_irq(netdev->irq);
+        return retv;
+}
+
+/**
+ * ks_start_rx - ready to serve pkts
+ * @ks          : The chip information
+ *
+ */
+static void ks_start_rx(struct ks_net *ks)
+{
+        u16 cntl;
+
+        /* Enables QMU Receive (RXCR1). */
+        cntl = ks_rdreg16(ks, KS_RXCR1);
+        cntl |= RXCR1_RXE ;
+        ks_wrreg16(ks, KS_RXCR1, cntl);
+}  /* ks_start_rx */
+
+/**
+ * ks_stop_rx - stop to serve pkts
+ * @ks          : The chip information
+ *
+ */
+static void ks_stop_rx(struct ks_net *ks)
+{
+        u16 cntl;
+
+        /* Disables QMU Receive (RXCR1). */
+        cntl = ks_rdreg16(ks, KS_RXCR1);
+        cntl &= ~RXCR1_RXE ;
+        ks_wrreg16(ks, KS_RXCR1, cntl);
+
+}  /* ks_stop_rx */
+
+static unsigned long const ethernet_polynomial = 0x04c11db7U;
+
+static unsigned long ether_gen_crc(int length, u8 *data)
+{
+        long crc = -1;
+        while (--length >= 0) {
+                u8 current_octet = *data++;
+                int bit;
+
+                for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
+                        crc = (crc << 1) ^
+                                ((crc < 0) ^ (current_octet & 1) ?
+                        ethernet_polynomial : 0);
+                }
+        }
+        return (unsigned long)crc;
+}  /* ether_gen_crc */
+
+/**
+* ks_set_grpaddr - set multicast information
+* @ks : The chip information
+*/
+
+static void ks_set_grpaddr(struct ks_net *ks)
+{
+        u8      i;
+        u32     index, position, value;
+
+        memset(ks->mcast_bits, 0, sizeof(u8) * HW_MCAST_SIZE);
+
+        for (i = 0; i < ks->mcast_lst_size; i++) {
+                position = (ether_gen_crc(6, ks->mcast_lst[i]) >> 26) & 0x3f;
+                index = position >> 3;
+                value = 1 << (position & 7);
+                ks->mcast_bits[index] |= (u8)value;
+        }
+
+        for (i  = 0; i < HW_MCAST_SIZE; i++) {
+                if (i & 1) {
+                        ks_wrreg16(ks, (u16)((KS_MAHTR0 + i) & ~1),
+                                (ks->mcast_bits[i] << 8) |
+                                ks->mcast_bits[i - 1]);
+                }
+        }
+}  /* ks_set_grpaddr */
+
+/*
+* ks_clear_mcast - clear multicast information
+*
+* @ks : The chip information
+* This routine removes all mcast addresses set in the hardware.
+*/
+
+static void ks_clear_mcast(struct ks_net *ks)
+{
+        u16     i, mcast_size;
+        for (i = 0; i < HW_MCAST_SIZE; i++)
+                ks->mcast_bits[i] = 0;
+
+        mcast_size = HW_MCAST_SIZE >> 2;
+        for (i = 0; i < mcast_size; i++)
+                ks_wrreg16(ks, KS_MAHTR0 + (2*i), 0);
+}
+
+static void ks_set_promis(struct ks_net *ks, u16 promiscuous_mode)
+{
+        u16             cntl;
+        ks->promiscuous = promiscuous_mode;
+        ks_stop_rx(ks);  /* Stop receiving for reconfiguration */
+        cntl = ks_rdreg16(ks, KS_RXCR1);
+
+        cntl &= ~RXCR1_FILTER_MASK;
+        if (promiscuous_mode)
+                /* Enable Promiscuous mode */
+                cntl |= RXCR1_RXAE | RXCR1_RXINVF;
+        else
+                /* Disable Promiscuous mode (default normal mode) */
+                cntl |= RXCR1_RXPAFMA;
+
+        ks_wrreg16(ks, KS_RXCR1, cntl);
+
+        if (ks->enabled)
+                ks_start_rx(ks);
+
+}  /* ks_set_promis */
+
+static void ks_set_mcast(struct ks_net *ks, u16 mcast)
+{
+        u16     cntl;
+
+        ks->all_mcast = mcast;
+        ks_stop_rx(ks);  /* Stop receiving for reconfiguration */
+        cntl = ks_rdreg16(ks, KS_RXCR1);
+        cntl &= ~RXCR1_FILTER_MASK;
+        if (mcast)
+                /* Enable "Perfect with Multicast address passed mode" */
+                cntl |= (RXCR1_RXAE | RXCR1_RXMAFMA | RXCR1_RXPAFMA);
+        else
+                /**
+                 * Disable "Perfect with Multicast address passed
+                 * mode" (normal mode).
+                 */
+                cntl |= RXCR1_RXPAFMA;
+
+        ks_wrreg16(ks, KS_RXCR1, cntl);
+
+        if (ks->enabled)
+                ks_start_rx(ks);
+}  /* ks_set_mcast */
+
+static void ks_set_rx_mode(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        struct dev_mc_list *ptr;
+
+        /* Turn on/off promiscuous mode. */
+        if ((netdev->flags & IFF_PROMISC) == IFF_PROMISC)
+                ks_set_promis(ks,
+                        (u16)((netdev->flags & IFF_PROMISC) == IFF_PROMISC));
+        /* Turn on/off all mcast mode. */
+        else if ((netdev->flags & IFF_ALLMULTI) == IFF_ALLMULTI)
+                ks_set_mcast(ks,
+                        (u16)((netdev->flags & IFF_ALLMULTI) == IFF_ALLMULTI));
+        else
+                ks_set_promis(ks, false);
+
+        if ((netdev->flags & IFF_MULTICAST) && netdev->mc_count) {
+                if (netdev->mc_count <= MAX_MCAST_LST) {
+                        int i = 0;
+                        for (ptr = netdev->mc_list; ptr; ptr = ptr->next) {
+                                if (!(*ptr->dmi_addr & 1))
+                                        continue;
+                                if (i >= MAX_MCAST_LST)
+                                        break;
+                                memcpy(ks->mcast_lst[i++], ptr->dmi_addr,
+                                MAC_ADDR_LEN);
+                        }
+                        ks->mcast_lst_size = (u8)i;
+                        ks_set_grpaddr(ks);
+                } else {
+                        /**
+                         * List too big to support so
+                         * turn on all mcast mode.
+                         */
+                        ks->mcast_lst_size = MAX_MCAST_LST;
+                        ks_set_mcast(ks, true);
+                }
+        } else {
+                ks->mcast_lst_size = 0;
+                ks_clear_mcast(ks);
+        }
+} /* ks_set_rx_mode */
+
+static void ks_set_mac(struct ks_net *ks, u8 *data)
+{
+        u16 *pw = (u16 *)data;
+        u16 w, u;
+
+        ks_stop_rx(ks);  /* Stop receiving for reconfiguration */
+
+        u = *pw++;
+        w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
+        ks_wrreg16(ks, KS_MARH, w);
+
+        u = *pw++;
+        w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
+        ks_wrreg16(ks, KS_MARM, w);
+
+        u = *pw;
+        w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
+        ks_wrreg16(ks, KS_MARL, w);
+
+        memcpy(ks->mac_addr, data, 6);
+
+        if (ks->enabled)
+                ks_start_rx(ks);
+}
+
+static int ks_set_mac_address(struct net_device *netdev, void *paddr)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        struct sockaddr *addr = paddr;
+        u8 *da;
+
+        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+
+        da = (u8 *)netdev->dev_addr;
+
+        ks_set_mac(ks, da);
+        return 0;
+}
+
+static int ks_net_ioctl(struct net_device *netdev, struct ifreq *req, int cmd)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+
+        if (!netif_running(netdev))
+                return -EINVAL;
+
+        return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
+}
+
+static const struct net_device_ops ks_netdev_ops = {
+        .ndo_open               = ks_net_open,
+        .ndo_stop               = ks_net_stop,
+        .ndo_do_ioctl           = ks_net_ioctl,
+        .ndo_start_xmit         = ks_start_xmit,
+        .ndo_set_mac_address    = ks_set_mac_address,
+        .ndo_set_rx_mode        = ks_set_rx_mode,
+        .ndo_change_mtu         = eth_change_mtu,
+        .ndo_validate_addr      = eth_validate_addr,
+};
+
+/* ethtool support */
+
+static void ks_get_drvinfo(struct net_device *netdev,
+                               struct ethtool_drvinfo *di)
+{
+        strlcpy(di->driver, DRV_NAME, sizeof(di->driver));
+        strlcpy(di->version, "1.00", sizeof(di->version));
+        strlcpy(di->bus_info, dev_name(netdev->dev.parent),
+                sizeof(di->bus_info));
+}
+
+static u32 ks_get_msglevel(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        return ks->msg_enable;
+}
+
+static void ks_set_msglevel(struct net_device *netdev, u32 to)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        ks->msg_enable = to;
+}
+
+static int ks_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        return mii_ethtool_gset(&ks->mii, cmd);
+}
+
+static int ks_set_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        return mii_ethtool_sset(&ks->mii, cmd);
+}
+
+static u32 ks_get_link(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        return mii_link_ok(&ks->mii);
+}
+
+static int ks_nway_reset(struct net_device *netdev)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        return mii_nway_restart(&ks->mii);
+}
+
+static const struct ethtool_ops ks_ethtool_ops = {
+        .get_drvinfo    = ks_get_drvinfo,
+        .get_msglevel   = ks_get_msglevel,
+        .set_msglevel   = ks_set_msglevel,
+        .get_settings   = ks_get_settings,
+        .set_settings   = ks_set_settings,
+        .get_link       = ks_get_link,
+        .nway_reset     = ks_nway_reset,
+};
+
+/* MII interface controls */
+
+/**
+ * ks_phy_reg - convert MII register into a KS8851 register
+ * @reg: MII register number.
+ *
+ * Return the KS8851 register number for the corresponding MII PHY register
+ * if possible. Return zero if the MII register has no direct mapping to the
+ * KS8851 register set.
+ */
+static int ks_phy_reg(int reg)
+{
+        switch (reg) {
+        case MII_BMCR:
+                return KS_P1MBCR;
+        case MII_BMSR:
+                return KS_P1MBSR;
+        case MII_PHYSID1:
+                return KS_PHY1ILR;
+        case MII_PHYSID2:
+                return KS_PHY1IHR;
+        case MII_ADVERTISE:
+                return KS_P1ANAR;
+        case MII_LPA:
+                return KS_P1ANLPR;
+        }
+
+        return 0x0;
+}
+
+/**
+ * ks_phy_read - MII interface PHY register read.
+ * @netdev: The network device the PHY is on.
+ * @phy_addr: Address of PHY (ignored as we only have one)
+ * @reg: The register to read.
+ *
+ * This call reads data from the PHY register specified in @reg. Since the
+ * device does not support all the MII registers, the non-existant values
+ * are always returned as zero.
+ *
+ * We return zero for unsupported registers as the MII code does not check
+ * the value returned for any error status, and simply returns it to the
+ * caller. The mii-tool that the driver was tested with takes any -ve error
+ * as real PHY capabilities, thus displaying incorrect data to the user.
+ */
+static int ks_phy_read(struct net_device *netdev, int phy_addr, int reg)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        int ksreg;
+        int result;
+
+        ksreg = ks_phy_reg(reg);
+        if (!ksreg)
+                return 0x0;     /* no error return allowed, so use zero */
+
+        mutex_lock(&ks->lock);
+        result = ks_rdreg16(ks, ksreg);
+        mutex_unlock(&ks->lock);
+
+        return result;
+}
+
+static void ks_phy_write(struct net_device *netdev,
+                             int phy, int reg, int value)
+{
+        struct ks_net *ks = netdev_priv(netdev);
+        int ksreg;
+
+        ksreg = ks_phy_reg(reg);
+        if (ksreg) {
+                mutex_lock(&ks->lock);
+                ks_wrreg16(ks, ksreg, value);
+                mutex_unlock(&ks->lock);
+        }
+}
+
+/**
+ * ks_read_selftest - read the selftest memory info.
+ * @ks: The device state
+ *
+ * Read and check the TX/RX memory selftest information.
+ */
+static int ks_read_selftest(struct ks_net *ks)
+{
+        unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
+        int ret = 0;
+        unsigned rd;
+
+        rd = ks_rdreg16(ks, KS_MBIR);
+
+        if ((rd & both_done) != both_done) {
+                ks_warn(ks, "Memory selftest not finished\n");
+                return 0;
+        }
+
+        if (rd & MBIR_TXMBFA) {
+                ks_err(ks, "TX memory selftest fails\n");
+                ret |= 1;
+        }
+
+        if (rd & MBIR_RXMBFA) {
+                ks_err(ks, "RX memory selftest fails\n");
+                ret |= 2;
+        }
+
+        ks_info(ks, "the selftest passes\n");
+        return ret;
+}
+
+static void ks_disable(struct ks_net *ks)
+{
+        u16     w;
+
+        w = ks_rdreg16(ks, KS_TXCR);
+
+        /* Disables QMU Transmit (TXCR). */
+        w  &= ~TXCR_TXE;
+        ks_wrreg16(ks, KS_TXCR, w);
+
+        /* Disables QMU Receive (RXCR1). */
+        w = ks_rdreg16(ks, KS_RXCR1);
+        w &= ~RXCR1_RXE ;
+        ks_wrreg16(ks, KS_RXCR1, w);
+
+        ks->enabled = false;
+
+}  /* ks_disable */
+
+static void ks_setup(struct ks_net *ks)
+{
+        u16     w;
+
+        /**
+         * Configure QMU Transmit
+         */
+
+        /* Setup Transmit Frame Data Pointer Auto-Increment (TXFDPR) */
+        ks_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
+
+        /* Setup Receive Frame Data Pointer Auto-Increment */
+        ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
+
+        /* Setup Receive Frame Threshold - 1 frame (RXFCTFC) */
+        ks_wrreg16(ks, KS_RXFCTR, 1 & RXFCTR_THRESHOLD_MASK);
+
+        /* Setup RxQ Command Control (RXQCR) */
+        ks->rc_rxqcr = RXQCR_CMD_CNTL;
+        ks_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
+
+        /**
+         * set the force mode to half duplex, default is full duplex
+         *  because if the auto-negotiation fails, most switch uses
+         *  half-duplex.
+         */
+
+        w = ks_rdreg16(ks, KS_P1MBCR);
+        w &= ~P1MBCR_FORCE_FDX;
+        ks_wrreg16(ks, KS_P1MBCR, w);
+
+        w = TXCR_TXFCE | TXCR_TXPE | TXCR_TXCRC | TXCR_TCGIP;
+        ks_wrreg16(ks, KS_TXCR, w);
+
+        w = RXCR1_RXFCE | RXCR1_RXBE | RXCR1_RXUE;
+
+        if (ks->promiscuous)         /* bPromiscuous */
+                w |= (RXCR1_RXAE | RXCR1_RXINVF);
+        else if (ks->all_mcast) /* Multicast address passed mode */
+                w |= (RXCR1_RXAE | RXCR1_RXMAFMA | RXCR1_RXPAFMA);
+        else                                   /* Normal mode */
+                w |= RXCR1_RXPAFMA;
+
+        ks_wrreg16(ks, KS_RXCR1, w);
+}  /*ks_setup */
+
+
+static void ks_setup_int(struct ks_net *ks)
+{
+        ks->rc_ier = 0x00;
+        /* Clear the interrupts status of the hardware. */
+        ks_wrreg16(ks, KS_ISR, 0xffff);
+
+        /* Enables the interrupts of the hardware. */
+        ks->rc_ier = (IRQ_LCI | IRQ_TXI | IRQ_RXI);
+}  /* ks_setup_int */
+
+void ks_enable(struct ks_net *ks)
+{
+        u16 w;
+
+        w = ks_rdreg16(ks, KS_TXCR);
+        /* Enables QMU Transmit (TXCR). */
+        ks_wrreg16(ks, KS_TXCR, w | TXCR_TXE);
+
+        /*
+         * RX Frame Count Threshold Enable and Auto-Dequeue RXQ Frame
+         * Enable
+         */
+
+        w = ks_rdreg16(ks, KS_RXQCR);
+        ks_wrreg16(ks, KS_RXQCR, w | RXQCR_RXFCTE);
+
+        /* Enables QMU Receive (RXCR1). */
+        w = ks_rdreg16(ks, KS_RXCR1);
+        ks_wrreg16(ks, KS_RXCR1, w | RXCR1_RXE);
+        ks->enabled = true;
+}  /* ks_enable */
+
+static int ks_hw_init(struct ks_net *ks)
+{
+#define MHEADER_SIZE    (sizeof(struct type_frame_head) * MAX_RECV_FRAMES)
+        ks->promiscuous = 0;
+        ks->all_mcast = 0;
+        ks->mcast_lst_size = 0;
+
+        ks->frame_head_info = (struct type_frame_head *) \
+                kmalloc(MHEADER_SIZE, GFP_KERNEL);
+        if (!ks->frame_head_info) {
+                printk(KERN_ERR "Error: Fail to allocate frame memory\n");
+                return false;
+        }
+
+        ks_set_mac(ks, KS_DEFAULT_MAC_ADDRESS);
+        return true;
+}
+
+
+static int __devinit ks8851_probe(struct platform_device *pdev)
+{
+        int err = -ENOMEM;
+        struct resource *io_d, *io_c;
+        struct net_device *netdev;
+        struct ks_net *ks;
+        u16 id, data;
+
+        io_d = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        io_c = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+        if (!request_mem_region(io_d->start, resource_size(io_d), DRV_NAME))
+                goto err_mem_region;
+
+        if (!request_mem_region(io_c->start, resource_size(io_c), DRV_NAME))
+                goto err_mem_region1;
+
+        netdev = alloc_etherdev(sizeof(struct ks_net));
+        if (!netdev)
+                goto err_alloc_etherdev;
+
+        SET_NETDEV_DEV(netdev, &pdev->dev);
+
+        ks = netdev_priv(netdev);
+        ks->netdev = netdev;
+        ks->hw_addr = ioremap(io_d->start, resource_size(io_d));
+
+        if (!ks->hw_addr)
+                goto err_ioremap;
+
+        ks->hw_addr_cmd = ioremap(io_c->start, resource_size(io_c));
+        if (!ks->hw_addr_cmd)
+                goto err_ioremap1;
+
+        ks->irq = platform_get_irq(pdev, 0);
+
+        if (ks->irq < 0) {
+                err = ks->irq;
+                goto err_get_irq;
+        }
+
+        ks->pdev = pdev;
+
+        mutex_init(&ks->lock);
+        spin_lock_init(&ks->statelock);
+
+        netdev->netdev_ops = &ks_netdev_ops;
+        netdev->ethtool_ops = &ks_ethtool_ops;
+
+        /* setup mii state */
+        ks->mii.dev             = netdev;
+        ks->mii.phy_id          = 1,
+        ks->mii.phy_id_mask     = 1;
+        ks->mii.reg_num_mask    = 0xf;
+        ks->mii.mdio_read       = ks_phy_read;
+        ks->mii.mdio_write      = ks_phy_write;
+
+        ks_info(ks, "message enable is %d\n", msg_enable);
+        /* set the default message enable */
+        ks->msg_enable = netif_msg_init(msg_enable, (NETIF_MSG_DRV |
+                                                     NETIF_MSG_PROBE |
+                                                     NETIF_MSG_LINK));
+        ks_read_config(ks);
+
+        /* simple check for a valid chip being connected to the bus */
+        if ((ks_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) {
+                ks_err(ks, "failed to read device ID\n");
+                err = -ENODEV;
+                goto err_register;
+        }
+
+        if (ks_read_selftest(ks)) {
+                ks_err(ks, "failed to read device ID\n");
+                err = -ENODEV;
+                goto err_register;
+        }
+
+        err = register_netdev(netdev);
+        if (err)
+                goto err_register;
+
+        platform_set_drvdata(pdev, netdev);
+
+        ks_soft_reset(ks, GRR_GSR);
+        ks_hw_init(ks);
+        ks_disable(ks);
+        ks_setup(ks);
+        ks_setup_int(ks);
+        ks_enable_int(ks);
+        ks_enable(ks);
+        memcpy(netdev->dev_addr, ks->mac_addr, 6);
+
+        data = ks_rdreg16(ks, KS_OBCR);
+        ks_wrreg16(ks, KS_OBCR, data | OBCR_ODS_16MA);
+
+        /**
+         * If you want to use the default MAC addr,
+         * comment out the 2 functions below.
+         */
+
+        random_ether_addr(netdev->dev_addr);
+        ks_set_mac(ks, netdev->dev_addr);
+
+        id = ks_rdreg16(ks, KS_CIDER);
+
+        printk(KERN_INFO DRV_NAME
+                " Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
+                (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
+        return 0;
+
+err_register:
+err_get_irq:
+        iounmap(ks->hw_addr_cmd);
+err_ioremap1:
+        iounmap(ks->hw_addr);
+err_ioremap:
+        free_netdev(netdev);
+err_alloc_etherdev:
+        release_mem_region(io_c->start, resource_size(io_c));
+err_mem_region1:
+        release_mem_region(io_d->start, resource_size(io_d));
+err_mem_region:
+        return err;
+}
+
+static int __devexit ks8851_remove(struct platform_device *pdev)
+{
+        struct net_device *netdev = platform_get_drvdata(pdev);
+        struct ks_net *ks = netdev_priv(netdev);
+        struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        unregister_netdev(netdev);
+        iounmap(ks->hw_addr);
+        free_netdev(netdev);
+        release_mem_region(iomem->start, resource_size(iomem));
+        platform_set_drvdata(pdev, NULL);
+        return 0;
+
+}
+
+static struct platform_driver ks8851_platform_driver = {
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+        },
+        .probe = ks8851_probe,
+        .remove = __devexit_p(ks8851_remove),
+};
+
+static int __init ks8851_init(void)
+{
+        return platform_driver_register(&ks8851_platform_driver);
+}
+
+static void __exit ks8851_exit(void)
+{
+        platform_driver_unregister(&ks8851_platform_driver);
+}
+
+module_init(ks8851_init);
+module_exit(ks8851_exit);
+
+MODULE_DESCRIPTION("KS8851 MLL Network driver");
+MODULE_AUTHOR("David Choi <david.choi@micrel.com>");
+MODULE_LICENSE("GPL");
+module_param_named(message, msg_enable, int, 0);
+MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
+