dev/cs/if_csreg.h

/*-
 * 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: head/sys/dev/cs/if_csreg.h 139749 2005-01-06 01:43:34Z imp $
 */

#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))