[people/ms/u-boot.git] / drivers / net / plb2800_eth.c

/*
 * PLB2800 internal switch ethernet driver.
 *
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

#include <common.h>
#include <malloc.h>
#include <net.h>
#include <netdev.h>
#include <asm/addrspace.h>


#define NUM_RX_DESC	PKTBUFSRX
#define TOUT_LOOP	1000000

#define LONG_REF(addr) (*((volatile unsigned long*)addr))

#define CMAC_CRX_CTRL	LONG_REF(0xb800c870)
#define CMAC_CTX_CTRL	LONG_REF(0xb800c874)
#define SYS_MAC_ADDR_0	LONG_REF(0xb800c878)
#define SYS_MAC_ADDR_1	LONG_REF(0xb800c87c)
#define MIPS_H_MASK	LONG_REF(0xB800C810)

#define MA_LEARN	LONG_REF(0xb8008004)
#define DA_LOOKUP	LONG_REF(0xb8008008)

#define CMAC_CRX_CTRL_PD	0x00000001
#define CMAC_CRX_CTRL_CG	0x00000002
#define CMAC_CRX_CTRL_PL_SHIFT	2
#define CMAC_CRIT		0x0
#define CMAC_NON_CRIT		0x1
#define MBOX_STAT_ID_SHF	28
#define MBOX_STAT_CP		0x80000000
#define MBOX_STAT_MB		0x00000001
#define EN_MA_LEARN		0x02000000
#define EN_DA_LKUP		0x01000000
#define MA_DEST_SHF		11
#define DA_DEST_SHF		11
#define DA_STATE_SHF		19
#define TSTAMP_MS		0x00000000
#define SW_H_MBOX4_MASK		0x08000000
#define SW_H_MBOX3_MASK		0x04000000
#define SW_H_MBOX2_MASK		0x02000000
#define SW_H_MBOX1_MASK		0x01000000

typedef volatile struct {
  unsigned int stat;
  unsigned int cmd;
  unsigned int cnt;
  unsigned int adr;
} mailbox_t;

#define MBOX_REG(mb) ((mailbox_t*)(0xb800c830+(mb<<4)))

typedef volatile struct {
  unsigned int word0;
  unsigned int word1;
  unsigned int word2;
} mbhdr_t;

#define MBOX_MEM(mb) ((void*)(0xb800a000+((3-mb)<<11)))


static int plb2800_eth_init(struct eth_device *dev, bd_t * bis);
static int plb2800_eth_send(struct eth_device *dev, volatile void *packet,
						  int length);
static int plb2800_eth_recv(struct eth_device *dev);
static void plb2800_eth_halt(struct eth_device *dev);

static void plb2800_set_mac_addr(struct eth_device *dev, unsigned char * addr);
static unsigned char * plb2800_get_mac_addr(void);

static int rx_new;
static int mac_addr_set = 0;


int plb2800_eth_initialize(bd_t * bis)
{
	struct eth_device *dev;
	ulong temp;

#ifdef DEBUG
	printf("Entered plb2800_eth_initialize()\n");
#endif

	if (!(dev = (struct eth_device *) malloc (sizeof *dev)))
	{
		printf("Failed to allocate memory\n");
		return -1;
	}
	memset(dev, 0, sizeof(*dev));

	sprintf(dev->name, "PLB2800 Switch");
	dev->init = plb2800_eth_init;
	dev->halt = plb2800_eth_halt;
	dev->send = plb2800_eth_send;
	dev->recv = plb2800_eth_recv;

	eth_register(dev);

	/* bug fix */
	*(ulong *)0xb800e800 = 0x838;

	/* Set MBOX ownership */
	temp = CMAC_CRIT << MBOX_STAT_ID_SHF;
	MBOX_REG(0)->stat = temp;
	MBOX_REG(1)->stat = temp;

	temp = CMAC_NON_CRIT << MBOX_STAT_ID_SHF;
	MBOX_REG(2)->stat = temp;
	MBOX_REG(3)->stat = temp;

	plb2800_set_mac_addr(dev, plb2800_get_mac_addr());

	/* Disable all Mbox interrupt */
	temp = MIPS_H_MASK;
	temp &= ~ (SW_H_MBOX1_MASK | SW_H_MBOX2_MASK | SW_H_MBOX3_MASK | SW_H_MBOX4_MASK) ;
	MIPS_H_MASK = temp;

#ifdef DEBUG
	printf("Leaving plb2800_eth_initialize()\n");
#endif

	return 0;
}

static int plb2800_eth_init(struct eth_device *dev, bd_t * bis)
{
#ifdef DEBUG
	printf("Entering plb2800_eth_init()\n");
#endif

	plb2800_set_mac_addr(dev, dev->enetaddr);

	rx_new = 0;

#ifdef DEBUG
	printf("Leaving plb2800_eth_init()\n");
#endif

	return 0;
}


static int plb2800_eth_send(struct eth_device *dev, volatile void *packet,
						  int length)
{
	int                    i;
	int                    res         = -1;
	u32                    temp;
	mailbox_t *            mb          = MBOX_REG(0);
	char      *            mem         = MBOX_MEM(0);

#ifdef DEBUG
	printf("Entered plb2800_eth_send()\n");
#endif

	if (length <= 0)
	{
		printf ("%s: bad packet size: %d\n", dev->name, length);
		goto Done;
	}

	if (length < 64)
	{
		length = 64;
	}

	temp = CMAC_CRX_CTRL_CG | ((length + 4) << CMAC_CRX_CTRL_PL_SHIFT);

#ifdef DEBUG
	printf("0 mb->stat = 0x%x\n",  mb->stat);
#endif

	for(i = 0; mb->stat & (MBOX_STAT_CP | MBOX_STAT_MB); i++)
	{
		if (i >= TOUT_LOOP)
		{
			printf("%s: tx buffer not ready\n", dev->name);
			printf("1 mb->stat = 0x%x\n",  mb->stat);
			goto Done;
		}
	}

		/* For some strange reason, memcpy doesn't work, here!
		 */
	do
	{
		int words = (length >> 2) + 1;
		unsigned int* dst = (unsigned int*)(mem);
		unsigned int* src = (unsigned int*)(packet);
		for (i = 0; i < words; i++)
		{
			*dst = *src;
			dst++;
			src++;
		};
	} while(0);

	CMAC_CRX_CTRL = temp;
	mb->cmd = MBOX_STAT_CP;

#ifdef DEBUG
	printf("2 mb->stat = 0x%x\n",  mb->stat);
#endif

	res = length;
Done:

#ifdef DEBUG
	printf("Leaving plb2800_eth_send()\n");
#endif

	return res;
}


static int plb2800_eth_recv(struct eth_device *dev)
{
	int                    length  = 0;
	mailbox_t            * mbox    = MBOX_REG(3);
	unsigned char        * hdr     = MBOX_MEM(3);
	unsigned int           stat;

#ifdef DEBUG
	printf("Entered plb2800_eth_recv()\n");
#endif

	for (;;)
	{
		stat = mbox->stat;

		if (!(stat & MBOX_STAT_CP))
		{
			break;
		}

		length = ((*(hdr + 6) & 0x3f) << 8) + *(hdr + 7);
		memcpy((void *)NetRxPackets[rx_new], hdr + 12, length);

		stat &= ~MBOX_STAT_CP;
		mbox->stat = stat;
#ifdef DEBUG
		{
			int i;
			for (i=0;i<length - 4;i++)
			{
				if (i % 16 == 0) printf("\n%04x: ", i);
				printf("%02X ", NetRxPackets[rx_new][i]);
			}
			printf("\n");
		}
#endif

		if (length)
		{
#ifdef DEBUG
			printf("Received %d bytes\n", length);
#endif
			NetReceive((void*)(NetRxPackets[rx_new]),
			            length - 4);
		}
		else
		{
#if 1
			printf("Zero length!!!\n");
#endif
		}

		rx_new = (rx_new + 1) % NUM_RX_DESC;
	}

#ifdef DEBUG
	printf("Leaving plb2800_eth_recv()\n");
#endif

	return length;
}


static void plb2800_eth_halt(struct eth_device *dev)
{
#ifdef DEBUG
	printf("Entered plb2800_eth_halt()\n");
#endif

#ifdef DEBUG
	printf("Leaving plb2800_eth_halt()\n");
#endif
}

static void plb2800_set_mac_addr(struct eth_device *dev, unsigned char * addr)
{
	char packet[60];
	ulong temp;
	int ix;

	if (mac_addr_set ||
	    NULL == addr || memcmp(addr, "\0\0\0\0\0\0", 6) == 0)
	{
		return;
	}

	/* send one packet through CPU port
	 * in order to learn system MAC address
	 */

	/* Set DA_LOOKUP register */
	temp = EN_MA_LEARN | (0 << DA_STATE_SHF) | (63 << DA_DEST_SHF);
	DA_LOOKUP = temp;

	/* Set MA_LEARN register */
	temp = 50 << MA_DEST_SHF;	/* static entry */
	MA_LEARN = temp;

	/* set destination address */
	for (ix=0;ix<6;ix++)
		packet[ix] = 0xff;

	/* set source address = system MAC address */
	for (ix=0;ix<6;ix++)
		packet[6+ix] = addr[ix];

	/* set type field */
	packet[12]=0xaa;
	packet[13]=0x55;

	/* set data field */
	for(ix=14;ix<60;ix++)
		packet[ix] = 0x00;

#ifdef DEBUG
	for (ix=0;ix<6;ix++)
		printf("mac_addr[%d]=%02X\n", ix, (unsigned char)packet[6+ix]);
#endif

	/* set one packet */
	plb2800_eth_send(dev, packet, sizeof(packet));

	/* delay for a while */
	for(ix=0;ix<65535;ix++)
		temp = ~temp;

	/* Set CMAC_CTX_CTRL register */
	temp = TSTAMP_MS;	/* no autocast */
	CMAC_CTX_CTRL = temp;

	/* Set DA_LOOKUP register */
	temp = EN_DA_LKUP;
	DA_LOOKUP = temp;

	mac_addr_set = 1;
}

static unsigned char * plb2800_get_mac_addr(void)
{
	static unsigned char addr[6];
	char *tmp, *end;
	int i;

	tmp = getenv ("ethaddr");
	if (NULL == tmp) return NULL;

	for (i=0; i<6; i++) {
		addr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
		if (tmp)
			tmp = (*end) ? end+1 : end;
	}

	return addr;
}
Commit	Line	Data
60fbe254 WD	1	/*
	2	* PLB2800 internal switch ethernet driver.
	3	*
	4	* (C) Copyright 2003
	5	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	6	*
	7	* See file CREDITS for list of people who contributed to this
	8	* project.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of
	13	* the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	23	* MA 02111-1307 USA
	24	*/
	25
	26	#include <common.h>
60fbe254 WD	27	#include <malloc.h>
60fbe254 WD	28	#include <net.h>
4fce2ace	29	#include <netdev.h>
60fbe254 WD	30	#include <asm/addrspace.h>
	31
	32
	33	#define NUM_RX_DESC PKTBUFSRX
	34	#define TOUT_LOOP 1000000
	35
	36	#define LONG_REF(addr) (((volatile unsigned long)addr))
	37
	38	#define CMAC_CRX_CTRL LONG_REF(0xb800c870)
	39	#define CMAC_CTX_CTRL LONG_REF(0xb800c874)
	40	#define SYS_MAC_ADDR_0 LONG_REF(0xb800c878)
	41	#define SYS_MAC_ADDR_1 LONG_REF(0xb800c87c)
	42	#define MIPS_H_MASK LONG_REF(0xB800C810)
	43
	44	#define MA_LEARN LONG_REF(0xb8008004)
	45	#define DA_LOOKUP LONG_REF(0xb8008008)
	46
	47	#define CMAC_CRX_CTRL_PD 0x00000001
	48	#define CMAC_CRX_CTRL_CG 0x00000002
	49	#define CMAC_CRX_CTRL_PL_SHIFT 2
	50	#define CMAC_CRIT 0x0
	51	#define CMAC_NON_CRIT 0x1
	52	#define MBOX_STAT_ID_SHF 28
	53	#define MBOX_STAT_CP 0x80000000
	54	#define MBOX_STAT_MB 0x00000001
	55	#define EN_MA_LEARN 0x02000000
	56	#define EN_DA_LKUP 0x01000000
8bde7f77	57	#define MA_DEST_SHF 11
60fbe254 WD	58	#define DA_DEST_SHF 11
	59	#define DA_STATE_SHF 19
	60	#define TSTAMP_MS 0x00000000
	61	#define SW_H_MBOX4_MASK 0x08000000
	62	#define SW_H_MBOX3_MASK 0x04000000
	63	#define SW_H_MBOX2_MASK 0x02000000
	64	#define SW_H_MBOX1_MASK 0x01000000
	65
	66	typedef volatile struct {
	67	unsigned int stat;
	68	unsigned int cmd;
	69	unsigned int cnt;
	70	unsigned int adr;
	71	} mailbox_t;
	72
	73	#define MBOX_REG(mb) ((mailbox_t*)(0xb800c830+(mb<<4)))
	74
	75	typedef volatile struct {
	76	unsigned int word0;
	77	unsigned int word1;
	78	unsigned int word2;
	79	} mbhdr_t;
	80
	81	#define MBOX_MEM(mb) ((void*)(0xb800a000+((3-mb)<<11)))
	82
	83
	84	static int plb2800_eth_init(struct eth_device dev, bd_t bis);
	85	static int plb2800_eth_send(struct eth_device dev, volatile void packet,
	86	int length);
	87	static int plb2800_eth_recv(struct eth_device *dev);
	88	static void plb2800_eth_halt(struct eth_device *dev);
	89
	90	static void plb2800_set_mac_addr(struct eth_device dev, unsigned char addr);
	91	static unsigned char * plb2800_get_mac_addr(void);
	92
	93	static int rx_new;
	94	static int mac_addr_set = 0;
	95
	96
	97	int plb2800_eth_initialize(bd_t * bis)
	98	{
	99	struct eth_device *dev;
	100	ulong temp;
	101
	102	#ifdef DEBUG
	103	printf("Entered plb2800_eth_initialize()\n");
	104	#endif
	105
	106	if (!(dev = (struct eth_device ) malloc (sizeof dev)))
	107	{
	108	printf("Failed to allocate memory\n");
4fce2ace	109	return -1;
60fbe254 WD	110	}
	111	memset(dev, 0, sizeof(*dev));
	112
	113	sprintf(dev->name, "PLB2800 Switch");
	114	dev->init = plb2800_eth_init;
	115	dev->halt = plb2800_eth_halt;
	116	dev->send = plb2800_eth_send;
	117	dev->recv = plb2800_eth_recv;
	118
	119	eth_register(dev);
	120
8bde7f77 WD	121	/* bug fix */
8bde7f77 WD	122	(ulong )0xb800e800 = 0x838;
60fbe254 WD	123
	124	/* Set MBOX ownership */
	125	temp = CMAC_CRIT << MBOX_STAT_ID_SHF;
	126	MBOX_REG(0)->stat = temp;
	127	MBOX_REG(1)->stat = temp;
	128
8bde7f77	129	temp = CMAC_NON_CRIT << MBOX_STAT_ID_SHF;
60fbe254 WD	130	MBOX_REG(2)->stat = temp;
60fbe254 WD	131	MBOX_REG(3)->stat = temp;
8bde7f77	132
60fbe254 WD	133	plb2800_set_mac_addr(dev, plb2800_get_mac_addr());
	134
	135	/* Disable all Mbox interrupt */
	136	temp = MIPS_H_MASK;
8bde7f77	137	temp &= ~ (SW_H_MBOX1_MASK \| SW_H_MBOX2_MASK \| SW_H_MBOX3_MASK \| SW_H_MBOX4_MASK) ;
60fbe254 WD	138	MIPS_H_MASK = temp;
	139
	140	#ifdef DEBUG
	141	printf("Leaving plb2800_eth_initialize()\n");
	142	#endif
	143
4fce2ace	144	return 0;
60fbe254 WD	145	}
	146
	147	static int plb2800_eth_init(struct eth_device dev, bd_t bis)
	148	{
	149	#ifdef DEBUG
	150	printf("Entering plb2800_eth_init()\n");
	151	#endif
	152
	153	plb2800_set_mac_addr(dev, dev->enetaddr);
	154
	155	rx_new = 0;
	156
	157	#ifdef DEBUG
	158	printf("Leaving plb2800_eth_init()\n");
	159	#endif
	160
	161	return 0;
	162	}
	163
	164
	165	static int plb2800_eth_send(struct eth_device dev, volatile void packet,
	166	int length)
	167	{
	168	int i;
	169	int res = -1;
	170	u32 temp;
	171	mailbox_t * mb = MBOX_REG(0);
	172	char * mem = MBOX_MEM(0);
	173
	174	#ifdef DEBUG
	175	printf("Entered plb2800_eth_send()\n");
	176	#endif
	177
	178	if (length <= 0)
	179	{
	180	printf ("%s: bad packet size: %d\n", dev->name, length);
	181	goto Done;
	182	}
	183
	184	if (length < 64)
	185	{
	186	length = 64;
	187	}
	188
	189	temp = CMAC_CRX_CTRL_CG \| ((length + 4) << CMAC_CRX_CTRL_PL_SHIFT);
	190
	191	#ifdef DEBUG
	192	printf("0 mb->stat = 0x%x\n", mb->stat);
	193	#endif
	194
	195	for(i = 0; mb->stat & (MBOX_STAT_CP \| MBOX_STAT_MB); i++)
	196	{
	197	if (i >= TOUT_LOOP)
	198	{
	199	printf("%s: tx buffer not ready\n", dev->name);
	200	printf("1 mb->stat = 0x%x\n", mb->stat);
	201	goto Done;
	202	}
	203	}
	204
	205	/* For some strange reason, memcpy doesn't work, here!
	206	*/
	207	do
	208	{
209	int words = (length >> 2) + 1;
210	unsigned int* dst = (unsigned int*)(mem);
211	unsigned int* src = (unsigned int*)(packet);
212	for (i = 0; i < words; i++)
213	{
214	dst = src;
215	dst++;
216	src++;
217	};
218	} while(0);
219
220	CMAC_CRX_CTRL = temp;
221	mb->cmd = MBOX_STAT_CP;
8bde7f77	222
60fbe254 WD	223	#ifdef DEBUG
	224	printf("2 mb->stat = 0x%x\n", mb->stat);
	225	#endif
	226
	227	res = length;
	228	Done:
	229
	230	#ifdef DEBUG
	231	printf("Leaving plb2800_eth_send()\n");
	232	#endif
	233
	234	return res;
	235	}
	236
	237
	238	static int plb2800_eth_recv(struct eth_device *dev)
	239	{
	240	int length = 0;
	241	mailbox_t * mbox = MBOX_REG(3);
	242	unsigned char * hdr = MBOX_MEM(3);
	243	unsigned int stat;
	244
	245	#ifdef DEBUG
	246	printf("Entered plb2800_eth_recv()\n");
	247	#endif
	248
	249	for (;;)
	250	{
	251	stat = mbox->stat;
	252
	253	if (!(stat & MBOX_STAT_CP))
	254	{
	255	break;
	256	}
8bde7f77	257
60fbe254 WD	258	length = (((hdr + 6) & 0x3f) << 8) + (hdr + 7);
	259	memcpy((void *)NetRxPackets[rx_new], hdr + 12, length);
	260
	261	stat &= ~MBOX_STAT_CP;
	262	mbox->stat = stat;
	263	#ifdef DEBUG
	264	{
	265	int i;
	266	for (i=0;i<length - 4;i++)
	267	{
	268	if (i % 16 == 0) printf("\n%04x: ", i);
	269	printf("%02X ", NetRxPackets[rx_new][i]);
	270	}
	271	printf("\n");
	272	}
	273	#endif
	274
	275	if (length)
	276	{
	277	#ifdef DEBUG
	278	printf("Received %d bytes\n", length);
	279	#endif
	280	NetReceive((void*)(NetRxPackets[rx_new]),
	281	length - 4);
	282	}
	283	else
	284	{
	285	#if 1
	286	printf("Zero length!!!\n");
	287	#endif
	288	}
	289
	290	rx_new = (rx_new + 1) % NUM_RX_DESC;
	291	}
	292
	293	#ifdef DEBUG
	294	printf("Leaving plb2800_eth_recv()\n");
	295	#endif
	296
	297	return length;
	298	}
	299
	300
	301	static void plb2800_eth_halt(struct eth_device *dev)
	302	{
	303	#ifdef DEBUG
	304	printf("Entered plb2800_eth_halt()\n");
	305	#endif
	306
	307	#ifdef DEBUG
	308	printf("Leaving plb2800_eth_halt()\n");
	309	#endif
	310	}
	311
	312	static void plb2800_set_mac_addr(struct eth_device dev, unsigned char addr)
	313	{
	314	char packet[60];
	315	ulong temp;
	316	int ix;
	317
	318	if (mac_addr_set \|\|
	319	NULL == addr \|\| memcmp(addr, "\0\0\0\0\0\0", 6) == 0)
	320	{
	321	return;
322	}
8bde7f77	323
60fbe254 WD	324	/* send one packet through CPU port
60fbe254 WD	325	* in order to learn system MAC address
8bde7f77	326	*/
60fbe254 WD	327
60fbe254 WD	328	/* Set DA_LOOKUP register */
8bde7f77	329	temp = EN_MA_LEARN \| (0 << DA_STATE_SHF) \| (63 << DA_DEST_SHF);
60fbe254 WD	330	DA_LOOKUP = temp;
	331
	332	/* Set MA_LEARN register */
53677ef1	333	temp = 50 << MA_DEST_SHF; /* static entry */
60fbe254 WD	334	MA_LEARN = temp;
	335
	336	/* set destination address */
	337	for (ix=0;ix<6;ix++)
	338	packet[ix] = 0xff;
8bde7f77	339
60fbe254 WD	340	/* set source address = system MAC address */
	341	for (ix=0;ix<6;ix++)
	342	packet[6+ix] = addr[ix];
	343
	344	/* set type field */
	345	packet[12]=0xaa;
	346	packet[13]=0x55;
	347
	348	/* set data field */
	349	for(ix=14;ix<60;ix++)
	350	packet[ix] = 0x00;
8bde7f77	351
60fbe254 WD	352	#ifdef DEBUG
	353	for (ix=0;ix<6;ix++)
	354	printf("mac_addr[%d]=%02X\n", ix, (unsigned char)packet[6+ix]);
	355	#endif
	356
	357	/* set one packet */
	358	plb2800_eth_send(dev, packet, sizeof(packet));
	359
	360	/* delay for a while */
	361	for(ix=0;ix<65535;ix++)
	362	temp = ~temp;
	363
8bde7f77	364	/* Set CMAC_CTX_CTRL register */
60fbe254 WD	365	temp = TSTAMP_MS; /* no autocast */
60fbe254 WD	366	CMAC_CTX_CTRL = temp;
8bde7f77	367
60fbe254 WD	368	/* Set DA_LOOKUP register */
	369	temp = EN_DA_LKUP;
	370	DA_LOOKUP = temp;
	371
	372	mac_addr_set = 1;
	373	}
	374
	375	static unsigned char * plb2800_get_mac_addr(void)
	376	{
	377	static unsigned char addr[6];
	378	char tmp, end;
	379	int i;
8bde7f77	380
60fbe254 WD	381	tmp = getenv ("ethaddr");
60fbe254 WD	382	if (NULL == tmp) return NULL;
8bde7f77	383
60fbe254 WD	384	for (i=0; i<6; i++) {
	385	addr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
	386	if (tmp)
	387	tmp = (*end) ? end+1 : end;
	388	}
	389
	390	return addr;
	391	}