3c515.c

linux下从网卡远程启动

/*
*    3c515.c -- 3COM 3C515 Fast Etherlink ISA 10/100BASE-TX driver for etherboot
*    Copyright (C) 2002 Timothy Legge <[e-mail]>
*
*    This program is free software; you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation; either version 2 of the License, or
*    (at your option) any later version.
*
*    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.
*
* Portions of this code:
* Copyright (C) 1997-2002 Donald Becker  3c515.c: A 3Com ISA EtherLink XL "Corkscrew" ethernet driver for linux.
* Copyright (C) 2001 P.J.H.Fox ([e-mail]) ISAPNP Tools
* Copyright (c) 2002 Jaroslav Kysela <[e-mail]>  ISA Plug & Play support Linux Kernel
* Copyright (C) 2000 Shusuke Nisiyama <[e-mail]> etherboot-5.0.5 3c595.c
* Coptright (C) 1995 Martin Renters etherboot-5.0.5 3c509.c
* Copyright (C) 1999 LightSys Technology Services, Inc. etherboot-5.0.5 3c90x.c
* Portions Copyright (C) 1999 Steve Smith etherboot-5.0.5 3c90x.c
*
* The probe and reset functions and defines are direct copies from the
* Becker code modified where necessary to make it work for etherboot
*
* The poll and transmit functions either contain code from or were written by referencing
* the above referenced etherboot drivers.  This driver would not have been
* possible without this prior work
*
* REVISION HISTORY:
* ================
* v0.10	4-17-2002	TJL	Initial implementation.
* v0.11 4-17-2002       TJL     Cleanup of the code
* v0.12 4-26-2002       TJL     Added ISA Plug and Play for Non-PNP Bioses
* v0.13 6-10-2002       TJL     Fixed ISA_PNP MAC Address problem
* v0.14 9-23-2003	TJL	Replaced delay with currticks
*
* Indent Options: indent -kr -i8
* *********************************************************/


#define ISA_PNP
/*#define EDEBUG1*/

/* to get some global routines like printf */
#include "etherboot.h"
/* to get the interface to the body of the program */
#include "nic.h"
#include "isa.h"
#include "timer.h"

#ifdef ISA_PNP

static void t3c515_wait(unsigned int nticks)
{
	unsigned int to = currticks() + nticks;
	while (currticks() < to)
		/* wait */ ;
}
#endif
/* TJL definations */
#define HZ      100
#define u16 unsigned short
#define u32 unsigned long
#define s16 signed short
#define s32 signed long
static unsigned short eth_nic_base;
#define BASE 	(eth_nic_base)
static int if_port;
struct corkscrew_private *vp;
/* Brought directly from 3c515.c by Becker */
#define CORKSCREW 1

/* Maximum events (Rx packets, etc.) to handle at each interrupt.
static int max_interrupt_work = 20;
*/

/* Enable the automatic media selection code -- usually set. */
#define AUTOMEDIA 1

/* Allow the use of fragment bus master transfers instead of only
   programmed-I/O for Vortex cards.  Full-bus-master transfers are always
   enabled by default on Boomerang cards.  If VORTEX_BUS_MASTER is defined,
   the feature may be turned on using 'options'. */
#define VORTEX_BUS_MASTER

/* A few values that may be tweaked. */
/* Keep the ring sizes a power of two for efficiency. */
#define TX_RING_SIZE	16
#define RX_RING_SIZE	16
#define PKT_BUF_SZ		1536	/* Size of each temporary Rx buffer. */

/* "Knobs" for adjusting internal parameters. */
/* Put out somewhat more debugging messages. (0 - no msg, 1 minimal msgs). */
#define DRIVER_DEBUG 1
/* Some values here only for performance evaluation and path-coverage
   debugging.
static int rx_nocopy, rx_copy, queued_packet;
*/

#ifdef DRIVER_DEBUG
static int corkscrew_debug = DRIVER_DEBUG;
#else
static int corkscrew_debug = 1;
#endif

#define CORKSCREW_ID 10

#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)
#define EL3_CMD 0x0e
#define EL3_STATUS 0x0e
#define RX_BYTES_MASK			(unsigned short) (0x07ff)

enum corkscrew_cmd {
	TotalReset = 0 << 11, SelectWindow = 1 << 11, StartCoax = 2 << 11,
	RxDisable = 3 << 11, RxEnable = 4 << 11, RxReset = 5 << 11,
	UpStall = 6 << 11, UpUnstall = (6 << 11) + 1,
	DownStall = (6 << 11) + 2, DownUnstall = (6 << 11) + 3,
	RxDiscard = 8 << 11, TxEnable = 9 << 11, TxDisable =
	    10 << 11, TxReset = 11 << 11,
	FakeIntr = 12 << 11, AckIntr = 13 << 11, SetIntrEnb = 14 << 11,
	SetStatusEnb = 15 << 11, SetRxFilter = 16 << 11, SetRxThreshold =
	    17 << 11,
	SetTxThreshold = 18 << 11, SetTxStart = 19 << 11,
	StartDMAUp = 20 << 11, StartDMADown = (20 << 11) + 1, StatsEnable =
	    21 << 11,
	StatsDisable = 22 << 11, StopCoax = 23 << 11,
};

/* The SetRxFilter command accepts the following classes: */
enum RxFilter {
	RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8
};

/* Bits in the general status register. */
enum corkscrew_status {
	IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
	TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
	IntReq = 0x0040, StatsFull = 0x0080,
	DMADone = 1 << 8, DownComplete = 1 << 9, UpComplete = 1 << 10,
	DMAInProgress = 1 << 11,	/* DMA controller is still busy. */
	CmdInProgress = 1 << 12,	/* EL3_CMD is still busy. */
};

/* Register window 1 offsets, the window used in normal operation.
   On the Corkscrew this window is always mapped at offsets 0x10-0x1f. */
enum Window1 {
	TX_FIFO = 0x10, RX_FIFO = 0x10, RxErrors = 0x14,
	RxStatus = 0x18, Timer = 0x1A, TxStatus = 0x1B,
	TxFree = 0x1C,		/* Remaining free bytes in Tx buffer. */
};
enum Window0 {
	Wn0IRQ = 0x08,
#if defined(CORKSCREW)
	Wn0EepromCmd = 0x200A,	/* Corkscrew EEPROM command register. */
	Wn0EepromData = 0x200C,	/* Corkscrew EEPROM results register. */
#else
	Wn0EepromCmd = 10,	/* Window 0: EEPROM command register. */
	Wn0EepromData = 12,	/* Window 0: EEPROM results register. */
#endif
};
enum Win0_EEPROM_bits {
	EEPROM_Read = 0x80, EEPROM_WRITE = 0x40, EEPROM_ERASE = 0xC0,
	EEPROM_EWENB = 0x30,	/* Enable erasing/writing for 10 msec. */
	EEPROM_EWDIS = 0x00,	/* Disable EWENB before 10 msec timeout. */
};

enum Window3 {			/* Window 3: MAC/config bits. */
	Wn3_Config = 0, Wn3_MAC_Ctrl = 6, Wn3_Options = 8,
};
union wn3_config {
	int i;
	struct w3_config_fields {
		unsigned int ram_size:3, ram_width:1, ram_speed:2,
		    rom_size:2;
		int pad8:8;
		unsigned int ram_split:2, pad18:2, xcvr:3, pad21:1,
		    autoselect:1;
		int pad24:7;
	} u;
};

enum Window4 {
	Wn4_NetDiag = 6, Wn4_Media = 10,	/* Window 4: Xcvr/media bits. */
};
enum Win4_Media_bits {
	Media_SQE = 0x0008,	/* Enable SQE error counting for AUI. */
	Media_10TP = 0x00C0,	/* Enable link beat and jabber for 10baseT. */
	Media_Lnk = 0x0080,	/* Enable just link beat for 100TX/100FX. */
	Media_LnkBeat = 0x0800,
};
enum Window7 {			/* Window 7: Bus Master control. */
	Wn7_MasterAddr = 0, Wn7_MasterLen = 6, Wn7_MasterStatus = 12,
};

/* Boomerang-style bus master control registers.  Note ISA aliases! */
enum MasterCtrl {
	PktStatus = 0x400, DownListPtr = 0x404, FragAddr = 0x408, FragLen =
	    0x40c,
	TxFreeThreshold = 0x40f, UpPktStatus = 0x410, UpListPtr = 0x418,
};

/* The Rx and Tx descriptor lists.
   Caution Alpha hackers: these types are 32 bits!  Note also the 8 byte
   alignment contraint on tx_ring[] and rx_ring[]. */
struct boom_rx_desc {
	u32 next;
	s32 status;
	u32 addr;
	s32 length;
};

/* Values for the Rx status entry. */
enum rx_desc_status {
	RxDComplete = 0x00008000, RxDError = 0x4000,
	/* See boomerang_rx() for actual error bits */
};

struct boom_tx_desc {
	u32 next;
	s32 status;
	u32 addr;
	s32 length;
};

struct corkscrew_private {
	const char *product_name;
	struct net_device *next_module;
	/* The Rx and Tx rings are here to keep them quad-word-aligned. */
	struct boom_rx_desc rx_ring[RX_RING_SIZE];
	struct boom_tx_desc tx_ring[TX_RING_SIZE];
	/* The addresses of transmit- and receive-in-place skbuffs. */
	struct sk_buff *rx_skbuff[RX_RING_SIZE];
	struct sk_buff *tx_skbuff[TX_RING_SIZE];
	unsigned int cur_rx, cur_tx;	/* The next free ring entry */
	unsigned int dirty_rx, dirty_tx;	/* The ring entries to be free()ed. */
	struct sk_buff *tx_skb;	/* Packet being eaten by bus master ctrl.  */
	int capabilities;	/* Adapter capabilities word. */
	int options;		/* User-settable misc. driver options. */
	int last_rx_packets;	/* For media autoselection. */
	unsigned int available_media:8,	/* From Wn3_Options */
	 media_override:3,	/* Passed-in media type. */
	 default_media:3,	/* Read from the EEPROM. */
	 full_duplex:1, autoselect:1, bus_master:1,	/* Vortex can only do a fragment bus-m. */
	 full_bus_master_tx:1, full_bus_master_rx:1,	/* Boomerang  */
	 tx_full:1;
};

/* The action to take with a media selection timer tick.
   Note that we deviate from the 3Com order by checking 10base2 before AUI.
 */
enum xcvr_types {
	XCVR_10baseT =
	    0, XCVR_AUI, XCVR_10baseTOnly, XCVR_10base2, XCVR_100baseTx,
	XCVR_100baseFx, XCVR_MII = 6, XCVR_Default = 8,
};

static struct media_table {
	char *name;
	unsigned int media_bits:16,	/* Bits to set in Wn4_Media register. */
	 mask:8,		/* The transceiver-present bit in Wn3_Config. */
	 next:8;		/* The media type to try next. */
	short wait;		/* Time before we check media status. */
} media_tbl[] = {
	{
	"10baseT", Media_10TP, 0x08, XCVR_10base2, (14 * HZ) / 10}
	, {
	"10Mbs AUI", Media_SQE, 0x20, XCVR_Default, (1 * HZ) / 10}
	, {
	"undefined", 0, 0x80, XCVR_10baseT, 10000}
	, {
	"10base2", 0, 0x10, XCVR_AUI, (1 * HZ) / 10}
	, {
	"100baseTX", Media_Lnk, 0x02, XCVR_100baseFx,
		    (14 * HZ) / 10}
	, {
	"100baseFX", Media_Lnk, 0x04, XCVR_MII, (14 * HZ) / 10}
	, {
	"MII", 0, 0x40, XCVR_10baseT, 3 * HZ}
	, {
	"undefined", 0, 0x01, XCVR_10baseT, 10000}
	, {
	"Default", 0, 0xFF, XCVR_10baseT, 10000}
,};

/* TILEG Modified to remove reference to dev */
static int corkscrew_found_device(int ioaddr, int irq, int product_index,
				  int options, struct nic *nic);
static int corkscrew_probe1(int ioaddr, int irq, int product_index,
			    struct nic *nic);

/* This driver uses 'options' to pass the media type, full-duplex flag, etc. */
/* Note: this is the only limit on the number of cards supported!! */
static int options[8] = { -1, -1, -1, -1, -1, -1, -1, -1, };

/* End Brought directly from 3c515.c by Becker */

/**************************************************************************
RESET - Reset adapter
***************************************************************************/
static void t515_reset(struct nic *nic)
{
	int ioaddr = BASE;
	union wn3_config config;
	int i;

	/* Before initializing select the active media port. */
	EL3WINDOW(3);
	if (vp->full_duplex)
		outb(0x20, ioaddr + Wn3_MAC_Ctrl);	/* Set the full-duplex bit. */
	config.i = inl(ioaddr + Wn3_Config);

	if (vp->media_override != 7) {
		if (corkscrew_debug > 1)
			printf("Media override to transceiver %d (%s).\n",
			       vp->media_override,
			       media_tbl[vp->media_override].name);
		if_port = vp->media_override;
	} else if (vp->autoselect) {
		/* Find first available media type, starting with 100baseTx. */
		if_port = 4;
		while (!(vp->available_media & media_tbl[if_port].mask))
			if_port = media_tbl[if_port].next;

		if (corkscrew_debug > 1)
			printf("Initial media type %s.\n",
			       media_tbl[if_port].name);
	} else
		if_port = vp->default_media;

	config.u.xcvr = if_port;
	outl(config.i, ioaddr + Wn3_Config);

	if (corkscrew_debug > 1) {
		printf("corkscrew_open() InternalConfig 0x%hX.\n",
		       config.i);
	}

	outw(TxReset, ioaddr + EL3_CMD);
	for (i = 20; i >= 0; i--)
		if (!(inw(ioaddr + EL3_STATUS) & CmdInProgress))
			break;

	outw(RxReset, ioaddr + EL3_CMD);
	/* Wait a few ticks for the RxReset command to complete. */
	for (i = 20; i >= 0; i--)
		if (!(inw(ioaddr + EL3_STATUS) & CmdInProgress))
			break;

	outw(SetStatusEnb | 0x00, ioaddr + EL3_CMD);

	if (corkscrew_debug > 1) {
		EL3WINDOW(4);
		printf("FIXME: fix print for irq, not 9");
		printf("corkscrew_open() irq %d media status 0x%hX.\n",
		       9, inw(ioaddr + Wn4_Media));
	}

	/* Set the station address and mask in window 2 each time opened. */
	EL3WINDOW(2);
	for (i = 0; i < 6; i++)
		outb(nic->node_addr[i], ioaddr + i);
	for (; i < 12; i += 2)
		outw(0, ioaddr + i);

	if (if_port == 3)
		/* Start the thinnet transceiver. We should really wait 50ms... */
		outw(StartCoax, ioaddr + EL3_CMD);
	EL3WINDOW(4);
	outw((inw(ioaddr + Wn4_Media) & ~(Media_10TP | Media_SQE)) |
	     media_tbl[if_port].media_bits, ioaddr + Wn4_Media);

	/* Switch to the stats window, and clear all stats by reading. */
/*	outw(StatsDisable, ioaddr + EL3_CMD);*/
	EL3WINDOW(6);
	for (i = 0; i < 10; i++)
		inb(ioaddr + i);
	inw(ioaddr + 10);
	inw(ioaddr + 12);
	/* New: On the Vortex we must also clear the BadSSD counter. */
	EL3WINDOW(4);
	inb(ioaddr + 12);
	/* ..and on the Boomerang we enable the extra statistics bits. */
	outw(0x0040, ioaddr + Wn4_NetDiag);

	/* Switch to register set 7 for normal use. */
	EL3WINDOW(7);

	/* Temporarily left in place.  If these FIXMEs are printed
	   it meand that special logic for that card may need to be added
	   see Becker's 3c515.c driver */
	if (vp->full_bus_master_rx) {	/* Boomerang bus master. */
		printf("FIXME: Is this if necessary");