lan91c96.c

u-boot-1.1.6 for mini2440开发板。 支持网络下载

/*------------------------------------------------------------------------
 * lan91c96.c
 * This is a driver for SMSC's LAN91C96 single-chip Ethernet device, based
 * on the SMC91111 driver from U-boot.
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Rolf Offermanns <[e-mail]>
 *
 * Copyright (C) 2001 Standard Microsystems Corporation (SMSC)
 *       Developed by Simple Network Magic Corporation (SNMC)
 * Copyright (C) 1996 by Erik Stahlman (ES)
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Information contained in this file was obtained from the LAN91C96
 * manual from SMC.  To get a copy, if you really want one, you can find
 * information under www.smsc.com.
 *
 *
 * "Features" of the SMC chip:
 *   6144 byte packet memory. ( for the 91C96 )
 *   EEPROM for configuration
 *   AUI/TP selection  ( mine has 10Base2/10BaseT select )
 *
 * Arguments:
 * 	io	= for the base address
 *	irq	= for the IRQ
 *
 * author:
 * 	Erik Stahlman				( [e-mail] )
 * 	Daris A Nevil				( [e-mail] )
 *
 *
 * Hardware multicast code from Peter Cammaert ( [e-mail] )
 *
 * Sources:
 *    o   SMSC LAN91C96 databook (www.smsc.com)
 *    o   smc91111.c (u-boot driver)
 *    o   smc9194.c (linux kernel driver)
 *    o   lan91c96.c (Intel Diagnostic Manager driver)
 *
 * History:
 * 	04/30/03  Mathijs Haarman	Modified smc91111.c (u-boot version)
 *					for lan91c96
 *---------------------------------------------------------------------------
 */

#include <common.h>
#include <command.h>
#include "lan91c96.h"
#include <net.h>

#ifdef CONFIG_DRIVER_LAN91C96

#if (CONFIG_COMMANDS & CFG_CMD_NET)

/*------------------------------------------------------------------------
 *
 * Configuration options, for the experienced user to change.
 *
 -------------------------------------------------------------------------*/

/* Use power-down feature of the chip */
#define POWER_DOWN	0

/*
 * Wait time for memory to be free.  This probably shouldn't be
 * tuned that much, as waiting for this means nothing else happens
 * in the system
*/
#define MEMORY_WAIT_TIME 16

#define SMC_DEBUG 0

#if (SMC_DEBUG > 2 )
#define PRINTK3(args...) printf(args)
#else
#define PRINTK3(args...)
#endif

#if SMC_DEBUG > 1
#define PRINTK2(args...) printf(args)
#else
#define PRINTK2(args...)
#endif

#ifdef SMC_DEBUG
#define PRINTK(args...) printf(args)
#else
#define PRINTK(args...)
#endif


/*------------------------------------------------------------------------
 *
 * The internal workings of the driver.  If you are changing anything
 * here with the SMC stuff, you should have the datasheet and know
 * what you are doing.
 *
 *------------------------------------------------------------------------
 */
#define CARDNAME "LAN91C96"

#define SMC_BASE_ADDRESS CONFIG_LAN91C96_BASE

#define SMC_DEV_NAME "LAN91C96"
#define SMC_ALLOC_MAX_TRY 5
#define SMC_TX_TIMEOUT 30

#define ETH_ZLEN 60

#ifdef  CONFIG_LAN91C96_USE_32_BIT
#define USE_32_BIT  1
#else
#undef USE_32_BIT
#endif

/*-----------------------------------------------------------------
 *
 *  The driver can be entered at any of the following entry points.
 *
 *-----------------------------------------------------------------
 */

extern int eth_init (bd_t * bd);
extern void eth_halt (void);
extern int eth_rx (void);
extern int eth_send (volatile void *packet, int length);
#if 0
static int smc_hw_init (void);
#endif

/*
 * This is called by  register_netdev().  It is responsible for
 * checking the portlist for the SMC9000 series chipset.  If it finds
 * one, then it will initialize the device, find the hardware information,
 * and sets up the appropriate device parameters.
 * NOTE: Interrupts are *OFF* when this procedure is called.
 *
 * NB:This shouldn't be static since it is referred to externally.
 */
int smc_init (void);

/*
 * This is called by  unregister_netdev().  It is responsible for
 * cleaning up before the driver is finally unregistered and discarded.
 */
void smc_destructor (void);

/*
 * The kernel calls this function when someone wants to use the device,
 * typically 'ifconfig ethX up'.
 */
static int smc_open (bd_t *bd);


/*
 * This is called by the kernel in response to 'ifconfig ethX down'.  It
 * is responsible for cleaning up everything that the open routine
 * does, and maybe putting the card into a powerdown state.
 */
static int smc_close (void);

/*
 * This is a separate procedure to handle the receipt of a packet, to
 * leave the interrupt code looking slightly cleaner
 */
static int smc_rcv (void);

/* See if a MAC address is defined in the current environment. If so use it. If not
 . print a warning and set the environment and other globals with the default.
 . If an EEPROM is present it really should be consulted.
*/
int smc_get_ethaddr(bd_t *bd);
int get_rom_mac(unsigned char *v_rom_mac);

/* ------------------------------------------------------------
 * Internal routines
 * ------------------------------------------------------------
 */

static unsigned char smc_mac_addr[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c };

/*
 * This function must be called before smc_open() if you want to override
 * the default mac address.
 */

void smc_set_mac_addr (const unsigned char *addr)
{
	int i;

	for (i = 0; i < sizeof (smc_mac_addr); i++) {
		smc_mac_addr[i] = addr[i];
	}
}

/*
 * smc_get_macaddr is no longer used. If you want to override the default
 * mac address, call smc_get_mac_addr as a part of the board initialisation.
 */

#if 0
void smc_get_macaddr (byte * addr)
{
	/* MAC ADDRESS AT FLASHBLOCK 1 / OFFSET 0x10 */
	unsigned char *dnp1110_mac = (unsigned char *) (0xE8000000 + 0x20010);
	int i;


	for (i = 0; i < 6; i++) {
		addr[0] = *(dnp1110_mac + 0);
		addr[1] = *(dnp1110_mac + 1);
		addr[2] = *(dnp1110_mac + 2);
		addr[3] = *(dnp1110_mac + 3);
		addr[4] = *(dnp1110_mac + 4);
		addr[5] = *(dnp1110_mac + 5);
	}
}
#endif /* 0 */

/***********************************************
 * Show available memory                       *
 ***********************************************/
void dump_memory_info (void)
{
	word mem_info;
	word old_bank;

	old_bank = SMC_inw (LAN91C96_BANK_SELECT) & 0xF;

	SMC_SELECT_BANK (0);
	mem_info = SMC_inw (LAN91C96_MIR);
	PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);

	SMC_SELECT_BANK (old_bank);
}

/*
 * A rather simple routine to print out a packet for debugging purposes.
 */
#if SMC_DEBUG > 2
static void print_packet (byte *, int);
#endif

/* #define tx_done(dev) 1 */


/* this does a soft reset on the device */
static void smc_reset (void);

/* Enable Interrupts, Receive, and Transmit */
static void smc_enable (void);

/* this puts the device in an inactive state */
static void smc_shutdown (void);


static int poll4int (byte mask, int timeout)
{
	int tmo = get_timer (0) + timeout * CFG_HZ;
	int is_timeout = 0;
	word old_bank = SMC_inw (LAN91C96_BANK_SELECT);

	PRINTK2 ("Polling...\n");
	SMC_SELECT_BANK (2);
	while ((SMC_inw (LAN91C96_INT_STATS) & mask) == 0) {
		if (get_timer (0) >= tmo) {
			is_timeout = 1;
			break;
		}
	}

	/* restore old bank selection */
	SMC_SELECT_BANK (old_bank);

	if (is_timeout)
		return 1;
	else
		return 0;
}

/*
 * Function: smc_reset( void )
 * Purpose:
 *  	This sets the SMC91111 chip to its normal state, hopefully from whatever
 * 	mess that any other DOS driver has put it in.
 *
 * Maybe I should reset more registers to defaults in here?  SOFTRST  should
 * do that for me.
 *
 * Method:
 *	1.  send a SOFT RESET
 *	2.  wait for it to finish
 *	3.  enable autorelease mode
 *	4.  reset the memory management unit
 *	5.  clear all interrupts
 *
*/
static void smc_reset (void)
{
	PRINTK2 ("%s:smc_reset\n", SMC_DEV_NAME);

	/* This resets the registers mostly to defaults, but doesn't
	   affect EEPROM.  That seems unnecessary */
	SMC_SELECT_BANK (0);
	SMC_outw (LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);

	udelay (10);

	/* Disable transmit and receive functionality */
	SMC_outw (0, LAN91C96_RCR);
	SMC_outw (0, LAN91C96_TCR);

	/* set the control register */
	SMC_SELECT_BANK (1);
	SMC_outw (SMC_inw (LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
			  LAN91C96_CONTROL);

	/* Disable all interrupts */
	SMC_outb (0, LAN91C96_INT_MASK);
}

/*
 * Function: smc_enable
 * Purpose: let the chip talk to the outside work
 * Method:
 *	1.  Initialize the Memory Configuration Register
 *	2.  Enable the transmitter
 *	3.  Enable the receiver
*/
static void smc_enable ()
{
	PRINTK2 ("%s:smc_enable\n", SMC_DEV_NAME);
	SMC_SELECT_BANK (0);

	/* Initialize the Memory Configuration Register. See page
	   49 of the LAN91C96 data sheet for details. */
	SMC_outw (LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);

	/* Initialize the Transmit Control Register */
	SMC_outw (LAN91C96_TCR_TXENA, LAN91C96_TCR);
	/* Initialize the Receive Control Register
	 * FIXME:
	 * The promiscuous bit set because I could not receive ARP reply
	 * packets from the server when I send a ARP request. It only works
	 * when I set the promiscuous bit
	 */
	SMC_outw (LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR);
}

/*
 * Function: smc_shutdown
 * Purpose:  closes down the SMC91xxx chip.
 * Method:
 *	1. zero the interrupt mask
 *	2. clear the enable receive flag
 *	3. clear the enable xmit flags
 *
 * TODO:
 *   (1) maybe utilize power down mode.
 *	Why not yet?  Because while the chip will go into power down mode,
 *	the manual says that it will wake up in response to any I/O requests
 *	in the register space.   Empirical results do not show this working.
 */
static void smc_shutdown ()
{
	PRINTK2 (CARDNAME ":smc_shutdown\n");

	/* no more interrupts for me */
	SMC_SELECT_BANK (2);
	SMC_outb (0, LAN91C96_INT_MASK);

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK (0);
	SMC_outb (0, LAN91C96_RCR);
	SMC_outb (0, LAN91C96_TCR);
}


/*
 * Function:  smc_hardware_send_packet(struct net_device * )
 * Purpose:
 *	This sends the actual packet to the SMC9xxx chip.
 *
 * Algorithm:
 * 	First, see if a saved_skb is available.
 *		( this should NOT be called if there is no 'saved_skb'
 *	Now, find the packet number that the chip allocated
 *	Point the data pointers at it in memory
 *	Set the length word in the chip's memory
 *	Dump the packet to chip memory
 *	Check if a last byte is needed ( odd length packet )
 *		if so, set the control flag right
 * 	Tell the card to send it
 *	Enable the transmit interrupt, so I know if it failed
 * 	Free the kernel data if I actually sent it.
 */
static int smc_send_packet (volatile void *packet, int packet_length)
{
	byte packet_no;
	unsigned long ioaddr;
	byte *buf;
	int length;
	int numPages;
	int try = 0;
	int time_out;
	byte status;


	PRINTK3 ("%s:smc_hardware_send_packet\n", SMC_DEV_NAME);

	length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;

	/* allocate memory
	 ** The MMU wants the number of pages to be the number of 256 bytes
	 ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
	 **
	 ** The 91C111 ignores the size bits, but the code is left intact
	 ** for backwards and future compatibility.
	 **
	 ** Pkt size for allocating is data length +6 (for additional status
	 ** words, length and ctl!)
	 **
	 ** If odd size then last byte is included in this header.
	 */
	numPages = ((length & 0xfffe) + 6);
	numPages >>= 8;				/* Divide by 256 */

	if (numPages > 7) {
		printf ("%s: Far too big packet error. \n", SMC_DEV_NAME);
		return 0;
	}

	/* now, try to allocate the memory */

	SMC_SELECT_BANK (2);
	SMC_outw (LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);

  again:
	try++;
	time_out = MEMORY_WAIT_TIME;
	do {
		status = SMC_inb (LAN91C96_INT_STATS);
		if (status & LAN91C96_IST_ALLOC_INT) {

			SMC_outb (LAN91C96_IST_ALLOC_INT, LAN91C96_INT_STATS);
			break;
		}
	} while (--time_out);

	if (!time_out) {
		PRINTK2 ("%s: memory allocation, try %d failed ...\n",
				 SMC_DEV_NAME, try);
		if (try < SMC_ALLOC_MAX_TRY)
			goto again;
		else
			return 0;
	}

	PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
			 SMC_DEV_NAME, try);

	/* I can send the packet now.. */

	ioaddr = SMC_BASE_ADDRESS;

	buf = (byte *) packet;

	/* If I get here, I _know_ there is a packet slot waiting for me */
	packet_no = SMC_inb (LAN91C96_ARR);