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freebsd/sys/dev/cs/if_csreg.h

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/*-
* Copyright (c) 1997,1998 Maxim Bolotin and Oleg Sharoiko.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* $FreeBSD$
*/
#define CS_89x0_IO_PORTS 0x0020
#define PP_ChipID 0x0000 /* offset 0h -> Corp -ID */
/* offset 2h -> Model/Product Number */
/* offset 3h -> Chip Revision Number */
#define PP_ISAIOB 0x0020 /* IO base address */
#define PP_CS8900_ISAINT 0x0022 /* ISA interrupt select */
#define PP_CS8900_ISADMA 0x0024 /* ISA Rec DMA channel */
#define PP_CS8920_ISAINT 0x0370 /* ISA interrupt select */
#define PP_CS8920_ISADMA 0x0374 /* ISA Rec DMA channel */
#define PP_ISASOF 0x0026 /* ISA DMA offset */
#define PP_DmaFrameCnt 0x0028 /* ISA DMA Frame count */
#define PP_DmaByteCnt 0x002A /* ISA DMA Byte count */
#define PP_CS8920_ISAMemB 0x0348 /* Memory base */
/* EEPROM data and command registers */
#define PP_EECMD 0x0040 /* NVR Interface Command register */
#define PP_EEData 0x0042 /* NVR Interface Data Register */
#define PP_DebugReg 0x0044 /* Debug Register */
#define PP_RxCFG 0x0102 /* Rx Bus config */
#define PP_RxCTL 0x0104 /* Receive Control Register */
#define PP_TxCFG 0x0106 /* Transmit Config Register */
#define PP_TxCMD 0x0108 /* Transmit Command Register */
#define PP_BufCFG 0x010A /* Bus configuration Register */
#define PP_LineCTL 0x0112 /* Line Config Register */
#define PP_SelfCTL 0x0114 /* Self Command Register */
#define PP_BusCTL 0x0116 /* ISA bus control Register */
#define PP_TestCTL 0x0118 /* Test Register */
#define PP_AutoNegCTL 0x011C /* Auto Negotiation Ctrl */
#define PP_ISQ 0x0120 /* Interrupt Status */
#define PP_RxEvent 0x0124 /* Rx Event Register */
#define PP_TxEvent 0x0128 /* Tx Event Register */
#define PP_BufEvent 0x012C /* Bus Event Register */
#define PP_RxMiss 0x0130 /* Receive Miss Count */
#define PP_TxCol 0x0132 /* Transmit Collision Count */
#define PP_LineST 0x0134 /* Line State Register */
#define PP_SelfST 0x0136 /* Self State register */
#define PP_BusST 0x0138 /* Bus Status */
#define PP_TDR 0x013C /* Time Domain Reflectometry */
#define PP_AutoNegST 0x013E /* Auto Neg Status */
#define PP_TxCommand 0x0144 /* Tx Command */
#define PP_TxLength 0x0146 /* Tx Length */
#define PP_LAF 0x0150 /* Hash Table */
#define PP_IA 0x0158 /* Physical Address Register */
#define PP_RxStatus 0x0400 /* Receive start of frame */
#define PP_RxLength 0x0402 /* Receive Length of frame */
#define PP_RxFrame 0x0404 /* Receive frame pointer */
#define PP_TxFrame 0x0A00 /* Transmit frame pointer */
/*
* Primary I/O Base Address. If no I/O base is supplied by the user, then this
* can be used as the default I/O base to access the PacketPage Area.
*/
#define DEFAULTIOBASE 0x0300
#define FIRST_IO 0x020C /* First I/O port to check */
#define LAST_IO 0x037C /* Last I/O port to check (+10h) */
#define ADD_MASK 0x3000 /* Mask it use of the ADD_PORT register */
#define ADD_SIG 0x3000 /* Expected ID signature */
#define CHIP_EISA_ID_SIG 0x630E /* Product ID Code for Crystal Chip (CS8900 spec 4.3) */
#define PRODUCT_ID_ADD 0x0002 /* Address of product ID */
/* Mask to find out the types of registers */
#define REG_TYPE_MASK 0x001F
/* Eeprom Commands */
#define ERSE_WR_ENBL 0x00F0
#define ERSE_WR_DISABLE 0x0000
/* Defines Control/Config register quintuplet numbers */
#define RX_BUF_CFG 0x0003
#define RX_CONTROL 0x0005
#define TX_CFG 0x0007
#define TX_COMMAND 0x0009
#define BUF_CFG 0x000B
#define LINE_CONTROL 0x0013
#define SELF_CONTROL 0x0015
#define BUS_CONTROL 0x0017
#define TEST_CONTROL 0x0019
/* Defines Status/Count registers quintuplet numbers */
#define RX_EVENT 0x0004
#define TX_EVENT 0x0008
#define BUF_EVENT 0x000C
#define RX_MISS_COUNT 0x0010
#define TX_COL_COUNT 0x0012
#define LINE_STATUS 0x0014
#define SELF_STATUS 0x0016
#define BUS_STATUS 0x0018
#define TDR 0x001C
/*
* PP_RxCFG - Receive Configuration and Interrupt Mask
* bit definition - Read/write
*/
#define SKIP_1 0x0040
#define RX_STREAM_ENBL 0x0080
#define RX_OK_ENBL 0x0100
#define RX_DMA_ONLY 0x0200
#define AUTO_RX_DMA 0x0400
#define BUFFER_CRC 0x0800
#define RX_CRC_ERROR_ENBL 0x1000
#define RX_RUNT_ENBL 0x2000
#define RX_EXTRA_DATA_ENBL 0x4000
/* PP_RxCTL - Receive Control bit definition - Read/write */
#define RX_IA_HASH_ACCEPT 0x0040
#define RX_PROM_ACCEPT 0x0080
#define RX_OK_ACCEPT 0x0100
#define RX_MULTCAST_ACCEPT 0x0200
#define RX_IA_ACCEPT 0x0400
#define RX_BROADCAST_ACCEPT 0x0800
#define RX_BAD_CRC_ACCEPT 0x1000
#define RX_RUNT_ACCEPT 0x2000
#define RX_EXTRA_DATA_ACCEPT 0x4000
#define RX_ALL_ACCEPT (RX_PROM_ACCEPT | RX_BAD_CRC_ACCEPT | \
RX_RUNT_ACCEPT | RX_EXTRA_DATA_ACCEPT)
/*
* Default receive mode - individually addressed, broadcast, and error free
*/
#define RX_DEF_ACCEPT (RX_IA_ACCEPT | RX_BROADCAST_ACCEPT | RX_OK_ACCEPT)
/*
* PP_TxCFG - Transmit Configuration Interrupt Mask
* bit definition - Read/write
*/
#define TX_LOST_CRS_ENBL 0x0040
#define TX_SQE_ERROR_ENBL 0x0080
#define TX_OK_ENBL 0x0100
#define TX_LATE_COL_ENBL 0x0200
#define TX_JBR_ENBL 0x0400
#define TX_ANY_COL_ENBL 0x0800
#define TX_16_COL_ENBL 0x8000
/*
* PP_TxCMD - Transmit Command bit definition - Read-only
*/
#define TX_START_4_BYTES 0x0000
#define TX_START_64_BYTES 0x0040
#define TX_START_128_BYTES 0x0080
#define TX_START_ALL_BYTES 0x00C0
#define TX_FORCE 0x0100
#define TX_ONE_COL 0x0200
#define TX_TWO_PART_DEFF_DISABLE 0x0400
#define TX_NO_CRC 0x1000
#define TX_RUNT 0x2000
/*
* PP_BufCFG - Buffer Configuration Interrupt Mask
* bit definition - Read/write
*/
#define GENERATE_SW_INTERRUPT 0x0040
#define RX_DMA_ENBL 0x0080
#define READY_FOR_TX_ENBL 0x0100
#define TX_UNDERRUN_ENBL 0x0200
#define RX_MISS_ENBL 0x0400
#define RX_128_BYTE_ENBL 0x0800
#define TX_COL_COUNT_OVRFLOW_ENBL 0x1000
#define RX_MISS_COUNT_OVRFLOW_ENBL 0x2000
#define RX_DEST_MATCH_ENBL 0x8000
/*
* PP_LineCTL - Line Control bit definition - Read/write
*/
#define SERIAL_RX_ON 0x0040
#define SERIAL_TX_ON 0x0080
#define AUI_ONLY 0x0100
#define AUTO_AUI_10BASET 0x0200
#define MODIFIED_BACKOFF 0x0800
#define NO_AUTO_POLARITY 0x1000
#define TWO_PART_DEFDIS 0x2000
#define LOW_RX_SQUELCH 0x4000
/*
* PP_SelfCTL - Software Self Control bit definition - Read/write
*/
#define POWER_ON_RESET 0x0040
#define SW_STOP 0x0100
#define SLEEP_ON 0x0200
#define AUTO_WAKEUP 0x0400
#define HCB0_ENBL 0x1000
#define HCB1_ENBL 0x2000
#define HCB0 0x4000
#define HCB1 0x8000
/*
* PP_BusCTL - ISA Bus Control bit definition - Read/write
*/
#define RESET_RX_DMA 0x0040
#define MEMORY_ON 0x0400
#define DMA_BURST_MODE 0x0800
#define IO_CHANNEL_READY_ON 0x1000
#define RX_DMA_SIZE_64Ks 0x2000
#define ENABLE_IRQ 0x8000
/*
* PP_TestCTL - Test Control bit definition - Read/write
*/
#define LINK_OFF 0x0080
#define ENDEC_LOOPBACK 0x0200
#define AUI_LOOPBACK 0x0400
#define BACKOFF_OFF 0x0800
#define FAST_TEST 0x8000
/*
* PP_RxEvent - Receive Event Bit definition - Read-only
*/
#define RX_IA_HASHED 0x0040
#define RX_DRIBBLE 0x0080
#define RX_OK 0x0100
#define RX_HASHED 0x0200
#define RX_IA 0x0400
#define RX_BROADCAST 0x0800
#define RX_CRC_ERROR 0x1000
#define RX_RUNT 0x2000
#define RX_EXTRA_DATA 0x4000
#define HASH_INDEX_MASK 0x0FC00
/*
* PP_TxEvent - Transmit Event Bit definition - Read-only
*/
#define TX_LOST_CRS 0x0040
#define TX_SQE_ERROR 0x0080
#define TX_OK 0x0100
#define TX_LATE_COL 0x0200
#define TX_JBR 0x0400
#define TX_16_COL 0x8000
#define TX_SEND_OK_BITS (TX_OK | TX_LOST_CRS)
#define TX_COL_COUNT_MASK 0x7800
/*
* PP_BufEvent - Buffer Event Bit definition - Read-only
*/
#define SW_INTERRUPT 0x0040
#define RX_DMA 0x0080
#define READY_FOR_TX 0x0100
#define TX_UNDERRUN 0x0200
#define RX_MISS 0x0400
#define RX_128_BYTE 0x0800
#define TX_COL_OVRFLW 0x1000
#define RX_MISS_OVRFLW 0x2000
#define RX_DEST_MATCH 0x8000
/*
* PP_LineST - Ethernet Line Status bit definition - Read-only
*/
#define LINK_OK 0x0080
#define AUI_ON 0x0100
#define TENBASET_ON 0x0200
#define POLARITY_OK 0x1000
#define CRS_OK 0x4000
/*
* PP_SelfST - Chip Software Status bit definition
*/
#define ACTIVE_33V 0x0040
#define INIT_DONE 0x0080
#define SI_BUSY 0x0100
#define EEPROM_PRESENT 0x0200
#define EEPROM_OK 0x0400
#define EL_PRESENT 0x0800
#define EE_SIZE_64 0x1000
/*
* PP_BusST - ISA Bus Status bit definition
*/
#define TX_BID_ERROR 0x0080
#define READY_FOR_TX_NOW 0x0100
/*
* PP_AutoNegCTL - Auto Negotiation Control bit definition
*/
#define RE_NEG_NOW 0x0040
#define ALLOW_FDX 0x0080
#define AUTO_NEG_ENABLE 0x0100
#define NLP_ENABLE 0x0200
#define FORCE_FDX 0x8000
#define AUTO_NEG_BITS (FORCE_FDX | NLP_ENABLE | AUTO_NEG_ENABLE)
#define AUTO_NEG_MASK (FORCE_FDX | NLP_ENABLE | AUTO_NEG_ENABLE | \
ALLOW_FDX | RE_NEG_NOW)
/*
* PP_AutoNegST - Auto Negotiation Status bit definition
*/
#define AUTO_NEG_BUSY 0x0080
#define FLP_LINK 0x0100
#define FLP_LINK_GOOD 0x0800
#define LINK_FAULT 0x1000
#define HDX_ACTIVE 0x4000
#define FDX_ACTIVE 0x8000
/*
* The following block defines the ISQ event types
*/
#define ISQ_RECEIVER_EVENT 0x04
#define ISQ_TRANSMITTER_EVENT 0x08
#define ISQ_BUFFER_EVENT 0x0c
#define ISQ_RX_MISS_EVENT 0x10
#define ISQ_TX_COL_EVENT 0x12
#define ISQ_EVENT_MASK 0x003F /* ISQ mask to find out type of event */
#define ISQ_HIST 16 /* small history buffer */
#define AUTOINCREMENT 0x8000 /* Bit mask to set bit-15 for autoincrement */
#define TXRXBUFSIZE 0x0600
#define RXDMABUFSIZE 0x8000
#define RXDMASIZE 0x4000
#define TXRX_LENGTH_MASK 0x07FF
/* rx options bits */
#define RCV_WITH_RXON 1 /* Set SerRx ON */
#define RCV_COUNTS 2 /* Use Framecnt1 */
#define RCV_PONG 4 /* Pong respondent */
#define RCV_DONG 8 /* Dong operation */
#define RCV_POLLING 0x10 /* Poll RxEvent */
#define RCV_ISQ 0x20 /* Use ISQ, int */
#define RCV_AUTO_DMA 0x100 /* Set AutoRxDMAE */
#define RCV_DMA 0x200 /* Set RxDMA only */
#define RCV_DMA_ALL 0x400 /* Copy all DMA'ed */
#define RCV_FIXED_DATA 0x800 /* Every frame same */
#define RCV_IO 0x1000 /* Use ISA IO only */
#define RCV_MEMORY 0x2000 /* Use ISA Memory */
#define RAM_SIZE 0x1000 /* The card has 4k bytes or RAM */
#define PKT_START PP_TxFrame /* Start of packet RAM */
#define RX_FRAME_PORT 0x0000
#define TX_FRAME_PORT RX_FRAME_PORT
#define TX_CMD_PORT 0x0004
#define TX_CS8900_NOW 0x0000 /* Tx packet after 5 bytes copied */
#define TX_CS8900_AFTER_381 0x0020 /* Tx packet after 381 bytes copied */
#define TX_CS8900_AFTER_ALL 0x0060 /* Tx packet after all bytes copied */
#define TX_CS8920_NOW 0x0000 /* Tx packet after 5 bytes copied */
#define TX_CS8920_AFTER_381 0x0040 /* Tx packet after 381 bytes copied */
#define TX_CS8920_AFTER_1021 0x0080 /* Tx packet after1021 bytes copied */
#define TX_CS8920_AFTER_ALL 0x00C0 /* Tx packet after all bytes copied */
#define TX_LEN_PORT 0x0006
#define ISQ_PORT 0x0008
#define ADD_PORT 0x000A
#define DATA_PORT 0x000C
#define EEPROM_WRITE_EN 0x00F0
#define EEPROM_WRITE_DIS 0x0000
#define EEPROM_WRITE_CMD 0x0100
#define EEPROM_READ_CMD 0x0200
/* Receive Header
* Description of header of each packet in receive area of memory
*/
#define RBUF_EVENT_LOW 0 /* Low byte of RxEvent - status of received frame */
#define RBUF_EVENT_HIGH 1 /* High byte of RxEvent - status of received frame */
#define RBUF_LEN_LOW 2 /* Length of received data - low byte */
#define RBUF_LEN_HI 3 /* Length of received data - high byte */
#define RBUF_HEAD_LEN 4 /* Length of this header */
#define CHIP_READ 0x1 /* Used to mark state of the repins code (chip or dma) */
#define DMA_READ 0x2 /* Used to mark state of the repins code (chip or dma) */
/* for bios scan */
/* */
#ifdef CSDEBUG
/* use these values for debugging bios scan */
#define BIOS_START_SEG 0x00000
#define BIOS_OFFSET_INC 0x0010
#else
#define BIOS_START_SEG 0x0c000
#define BIOS_OFFSET_INC 0x0200
#endif
#define BIOS_LAST_OFFSET 0x0fc00
/*
* Byte offsets into the EEPROM configuration buffer
*/
#define ISA_CNF_OFFSET 0x6
#define TX_CTL_OFFSET (ISA_CNF_OFFSET + 8) /* 8900 eeprom */
#define AUTO_NEG_CNF_OFFSET (ISA_CNF_OFFSET + 8) /* 8920 eeprom */
/*
* the assumption here is that the bits in the eeprom are generally
* in the same position as those in the autonegctl register.
* Of course the IMM bit is not in that register so it must be
* masked out
*/
#define EE_FORCE_FDX 0x8000
#define EE_NLP_ENABLE 0x0200
#define EE_AUTO_NEG_ENABLE 0x0100
#define EE_ALLOW_FDX 0x0080
#define EE_AUTO_NEG_CNF_MASK (EE_FORCE_FDX | EE_NLP_ENABLE | \
EE_AUTO_NEG_ENABLE | EE_ALLOW_FDX)
#define IMM_BIT 0x0040 /* ignore missing media */
#define ADAPTER_CNF_OFFSET (AUTO_NEG_CNF_OFFSET + 2)
#define A_CNF_MEDIA 0x0007
#define A_CNF_10B_T 0x0001
#define A_CNF_AUI 0x0002
#define A_CNF_10B_2 0x0004
#define A_CNF_MEDIA_TYPE 0x0060
#define A_CNF_MEDIA_AUTO 0x0000
#define A_CNF_MEDIA_10B_T 0x0020
#define A_CNF_MEDIA_AUI 0x0040
#define A_CNF_MEDIA_10B_2 0x0060
#define A_CNF_DC_DC_POLARITY 0x0080
#define A_CNF_NO_AUTO_POLARITY 0x2000
#define A_CNF_LOW_RX_SQUELCH 0x4000
#define A_CNF_EXTND_10B_2 0x8000
#define PACKET_PAGE_OFFSET 0x8
/*
* Bit definitions for the ISA configuration word from the EEPROM
*/
#define INT_NO_MASK 0x000F
#define DMA_NO_MASK 0x0070
#define ISA_DMA_SIZE 0x0200
#define ISA_AUTO_RxDMA 0x0400
#define ISA_RxDMA 0x0800
#define DMA_BURST 0x1000
#define STREAM_TRANSFER 0x2000
#define ANY_ISA_DMA (ISA_AUTO_RxDMA | ISA_RxDMA)
/* DMA controller registers */
#define DMA_BASE 0x00 /* DMA controller base */
#define DMA_BASE_2 0x0C0 /* DMA controller base */
#define DMA_STAT 0x0D0 /* DMA controller status register */
#define DMA_MASK 0x0D4 /* DMA controller mask register */
#define DMA_MODE 0x0D6 /* DMA controller mode register */
#define DMA_RESETFF 0x0D8 /* DMA controller first/last flip flop */
/* DMA data */
#define DMA_DISABLE 0x04 /* Disable channel n */
#define DMA_ENABLE 0x00 /* Enable channel n */
/* Demand transfers, incr. address, auto init, writes, ch. n */
#define DMA_RX_MODE 0x14
/* Demand transfers, incr. address, auto init, reads, ch. n */
#define DMA_TX_MODE 0x18
#define DMA_SIZE (16*1024) /* Size of dma buffer - 16k */
#define CS8900 0x0000
#define CS8920 0x4000
#define CS8920M 0x6000
#define REVISON_BITS 0x1F00
#define EEVER_NUMBER 0x12
#define CHKSUM_LEN 0x14
#define CHKSUM_VAL 0x0000
#define START_EEPROM_DATA 0x001c /* Offset into eeprom for start of data */
#define IRQ_MAP_EEPROM_DATA 0x0046 /* Offset into eeprom for the IRQ map */
#define IRQ_MAP_LEN 0x0004 /* No of bytes to read for the IRQ map */
#define PNP_IRQ_FRMT 0x0022 /* PNP small item IRQ format */
#define CS8900_IRQ_MAP 0x1c20 /* This IRQ map is fixed */
#define CS8920_NO_INTS 0x0F /* Max CS8920 interrupt select # */
#define PNP_ADD_PORT 0x0279
#define PNP_WRITE_PORT 0x0A79
#define GET_PNP_ISA_STRUCT 0x40
#define PNP_ISA_STRUCT_LEN 0x06
#define PNP_CSN_CNT_OFF 0x01
#define PNP_RD_PORT_OFF 0x02
#define PNP_FUNCTION_OK 0x00
#define PNP_WAKE 0x03
#define PNP_RSRC_DATA 0x04
#define PNP_RSRC_READY 0x01
#define PNP_STATUS 0x05
#define PNP_ACTIVATE 0x30
#define PNP_CNF_IO_H 0x60
#define PNP_CNF_IO_L 0x61
#define PNP_CNF_INT 0x70
#define PNP_CNF_DMA 0x74
#define PNP_CNF_MEM 0x48
#define BIT0 1
#define BIT15 0x8000
#define CS_DUPLEX_AUTO 0
#define CS_DUPLEX_FULL 1
#define CS_DUPLEX_HALF 2
/* Device name */
#define CS_NAME "cs"
/*
* It would appear that for pccards (well, the IBM EtherJet PCMCIA card) that
* are connected to card bus bridges there's a problem. For reading the
* value back you have to go into 8 bit mode. The Linux driver also uses
* this trick. This may be a bug in the card and how it handles fast 16-bit
* read after a write.
*/
#define HACK_FOR_CARDBUS_BRIDGE_PROBLEM
#ifdef HACK_FOR_CARDBUS_BRIDGE_PROBLEM
static __inline uint16_t
cs_inw(struct cs_softc *sc, int off)
{
return ((inb(sc->nic_addr + off) & 0xff) |
(inb(sc->nic_addr + off + 1) << 8));
}
#else
static __inline uint16_t
cs_inw(struct cs_softc *sc, int off)
{
return (inw(sc->nic_addr + off));
}
#endif
static __inline void
cs_outw(struct cs_softc *sc, int off, uint16_t val)
{
outw(sc->nic_addr + off, val);
}
static __inline uint16_t
cs_readreg(struct cs_softc *sc, uint16_t port)
{
cs_outw(sc, ADD_PORT, port);
return (cs_inw(sc, DATA_PORT));
}
static __inline void
cs_writereg(struct cs_softc *sc, uint16_t port, uint16_t val)
{
cs_outw(sc, ADD_PORT, port);
cs_outw(sc, DATA_PORT, val);
}
static __inline void
reset_chip(struct cs_softc *sc)
{
cs_writereg(sc, PP_SelfCTL,
cs_readreg(sc, PP_SelfCTL) | POWER_ON_RESET);
}
#define cs_duplex_full(sc) \
(cs_writereg(sc, PP_AutoNegCTL, FORCE_FDX))
#define cs_duplex_half(sc) \
(cs_writereg(sc, PP_AutoNegCTL, NLP_ENABLE))
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