smc91111.c

u-boot-1.1.6 for mini2440开发板。 支持网络下载

/*------------------------------------------------------------------------
 . smc91111.c
 . This is a driver for SMSC's 91C111 single-chip Ethernet device.
 .
 . (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 LAN91C111
 . 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:
 .   Integrated PHY/MAC for 10/100BaseT Operation
 .   Supports internal and external MII
 .   Integrated 8K packet memory
 .   EEPROM interface for configuration
 .
 . 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 LAN91C111 databook (www.smsc.com)
 .    o	  smc9194.c by Erik Stahlman
 .    o	  skeleton.c by Donald Becker ( [e-mail] )
 .
 . History:
 .	06/19/03  Richard Woodruff Made u-boot environment aware and added mac addr checks.
 .	10/17/01  Marco Hasewinkel Modify for DNP/1110
 .	07/25/01  Woojung Huh	   Modify for ADS Bitsy
 .	04/25/01  Daris A Nevil	   Initial public release through SMSC
 .	03/16/01  Daris A Nevil	   Modified smc9194.c for use with LAN91C111
 ----------------------------------------------------------------------------*/

#include <common.h>
#include <command.h>
#include <config.h>
#include "smc91111.h"
#include <net.h>

#ifdef CONFIG_DRIVER_SMC91111

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

#define NO_AUTOPROBE

#define SMC_DEBUG 0

#if SMC_DEBUG > 1
static const char version[] =
	"smc91111.c:v1.0 04/25/01 by Daris A Nevil ([e-mail])\n";
#endif

/* Autonegotiation timeout in seconds */
#ifndef CONFIG_SMC_AUTONEG_TIMEOUT
#define CONFIG_SMC_AUTONEG_TIMEOUT 10
#endif

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

/*
 . 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


#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 "LAN91C111"

/* Memory sizing constant */
#define LAN91C111_MEMORY_MULTIPLIER	(1024*2)

#ifndef CONFIG_SMC91111_BASE
#define CONFIG_SMC91111_BASE 0x20000300
#endif

#define SMC_BASE_ADDRESS CONFIG_SMC91111_BASE

#define SMC_DEV_NAME "SMC91111"
#define SMC_PHY_ADDR 0x0000
#define SMC_ALLOC_MAX_TRY 5
#define SMC_TX_TIMEOUT 30

#define SMC_PHY_CLOCK_DELAY 1000

#define ETH_ZLEN 60

#ifdef	CONFIG_SMC_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);

#ifdef SHARED_RESOURCES
	extern void swap_to(int device_id);
#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);

/*
 . Configures the PHY through the MII Management interface
*/
#ifndef CONFIG_SMC91111_EXT_PHY
static void smc_phy_configure(void);
#endif /* !CONFIG_SMC91111_EXT_PHY */

/*
 . 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(uchar *v_rom_mac);

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

#ifdef CONFIG_SMC_USE_IOFUNCS
/*
 * input and output functions
 *
 * Implemented due to inx,outx macros accessing the device improperly
 * and putting the device into an unkown state.
 *
 * For instance, on Sharp LPD7A400 SDK, affects were chip memory
 * could not be free'd (hence the alloc failures), duplicate packets,
 * packets being corrupt (shifted) on the wire, etc.  Switching to the
 * inx,outx functions fixed this problem.
 */
static inline word SMC_inw(dword offset);
static inline void SMC_outw(word value, dword offset);
static inline byte SMC_inb(dword offset);
static inline void SMC_outb(byte value, dword offset);
static inline void SMC_insw(dword offset, volatile uchar* buf, dword len);
static inline void SMC_outsw(dword offset, uchar* buf, dword len);

#define barrier() __asm__ __volatile__("": : :"memory")

static inline word SMC_inw(dword offset)
{
	word v;
	v = *((volatile word*)(SMC_BASE_ADDRESS+offset));
	barrier(); *(volatile u32*)(0xc0000000);
	return v;
}

static inline void SMC_outw(word value, dword offset)
{
	*((volatile word*)(SMC_BASE_ADDRESS+offset)) = value;
	barrier(); *(volatile u32*)(0xc0000000);
}

static inline byte SMC_inb(dword offset)
{
	word  _w;

	_w = SMC_inw(offset & ~((dword)1));
	return (offset & 1) ? (byte)(_w >> 8) : (byte)(_w);
}

static inline void SMC_outb(byte value, dword offset)
{
	word  _w;

	_w = SMC_inw(offset & ~((dword)1));
	if (offset & 1)
			*((volatile word*)(SMC_BASE_ADDRESS+(offset & ~((dword)1)))) = (value<<8) | (_w & 0x00ff);
	else
			*((volatile word*)(SMC_BASE_ADDRESS+offset)) = value | (_w & 0xff00);
}

static inline void SMC_insw(dword offset, volatile uchar* buf, dword len)
{
	volatile word *p = (volatile word *)buf;

	while (len-- > 0) {
		*p++ = SMC_inw(offset);
		barrier();
		*((volatile u32*)(0xc0000000));
	}
}

static inline void SMC_outsw(dword offset, uchar* buf, dword len)
{
	volatile word *p = (volatile word *)buf;

	while (len-- > 0) {
		SMC_outw(*p++, offset);
		barrier();
		*(volatile u32*)(0xc0000000);
	}
}
#endif  /* CONFIG_SMC_USE_IOFUNCS */

static char unsigned smc_mac_addr[6] = {0x02, 0x80, 0xad, 0x20, 0x31, 0xb8};

/*
 * 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 initialization.
 */

#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(BANK_SELECT)&0xF;

	SMC_SELECT_BANK(0);
	mem_info = SMC_inw( MIR_REG );
	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 );

/* Routines to Read and Write the PHY Registers across the
   MII Management Interface
*/

#ifndef CONFIG_SMC91111_EXT_PHY
static word smc_read_phy_register(byte phyreg);
static void smc_write_phy_register(byte phyreg, word phydata);
#endif /* !CONFIG_SMC91111_EXT_PHY */


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

	PRINTK2 ("Polling...\n");
	SMC_SELECT_BANK (2);
	while ((SMC_inw (SMC91111_INT_REG) & 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;
}

/* Only one release command at a time, please */
static inline void smc_wait_mmu_release_complete (void)
{
	int count = 0;

	/* assume bank 2 selected */
	while (SMC_inw (MMU_CMD_REG) & MC_BUSY) {
		udelay (1);	/* Wait until not busy */
		if (++count > 200)
			break;
	}
}

/*
 . 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 (RCR_SOFTRST, RCR_REG);

	/* Setup the Configuration Register */
	/* This is necessary because the CONFIG_REG is not affected */
	/* by a soft reset */

	SMC_SELECT_BANK (1);
#if defined(CONFIG_SMC91111_EXT_PHY)
	SMC_outw (CONFIG_DEFAULT | CONFIG_EXT_PHY, CONFIG_REG);
#else
	SMC_outw (CONFIG_DEFAULT, CONFIG_REG);
#endif


	/* Release from possible power-down state */
	/* Configuration register is not affected by Soft Reset */
	SMC_outw (SMC_inw (CONFIG_REG) | CONFIG_EPH_POWER_EN, CONFIG_REG);

	SMC_SELECT_BANK (0);

	/* this should pause enough for the chip to be happy */
	udelay (10);

	/* Disable transmit and receive functionality */
	SMC_outw (RCR_CLEAR, RCR_REG);
	SMC_outw (TCR_CLEAR, TCR_REG);

	/* set the control register */
	SMC_SELECT_BANK (1);
	SMC_outw (CTL_DEFAULT, CTL_REG);

	/* Reset the MMU */
	SMC_SELECT_BANK (2);
	smc_wait_mmu_release_complete ();
	SMC_outw (MC_RESET, MMU_CMD_REG);
	while (SMC_inw (MMU_CMD_REG) & MC_BUSY)
		udelay (1);	/* Wait until not busy */

	/* Note:  It doesn't seem that waiting for the MMU busy is needed here,
	   but this is a place where future chipsets _COULD_ break.  Be wary
	   of issuing another MMU command right after this */

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

/*
 . Function: smc_enable
 . Purpose: let the chip talk to the outside work
 . Method:
 .	1.  Enable the transmitter
 .	2.  Enable the receiver
 .	3.  Enable interrupts
*/
static void smc_enable()
{
	PRINTK2("%s: smc_enable\n", SMC_DEV_NAME);
	SMC_SELECT_BANK( 0 );
	/* see the header file for options in TCR/RCR DEFAULT*/
	SMC_outw( TCR_DEFAULT, TCR_REG );
	SMC_outw( RCR_DEFAULT, RCR_REG );

	/* clear MII_DIS */
/*	smc_write_phy_register(PHY_CNTL_REG, 0x0000); */
}

/*
 . 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, IM_REG );

	/* and tell the card to stay away from that nasty outside world */
	SMC_SELECT_BANK( 0 );
	SMC_outb( RCR_CLEAR, RCR_REG );
	SMC_outb( TCR_CLEAR, TCR_REG );
#ifdef SHARED_RESOURCES
	swap_to(FLASH);
#endif
}