/* * (C) Copyright 2002 * Adam Kowalczyk, ACK Software Controls Inc. akowalczyk@cogeco.ca * * Some portions taken from 3c59x.c Written 1996-1999 by Donald Becker. * * Outline of the program based on eepro100.c which is * * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * 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 #include #include #include #include #include #include "articiaS.h" #include "memio.h" /* 3Com Ethernet PCI definitions*/ /* #define PCI_VENDOR_ID_3COM 0x10B7 */ #define PCI_DEVICE_ID_3COM_3C905C 0x9200 /* 3Com Commands, top 5 bits are command and bottom 11 bits are parameters */ #define TotalReset (0<<11) #define SelectWindow (1<<11) #define StartCoax (2<<11) #define RxDisable (3<<11) #define RxEnable (4<<11) #define RxReset (5<<11) #define UpStall (6<<11) #define UpUnstall (6<<11)+1 #define DownStall (6<<11)+2 #define DownUnstall (6<<11)+3 #define RxDiscard (8<<11) #define TxEnable (9<<11) #define TxDisable (10<<11) #define TxReset (11<<11) #define FakeIntr (12<<11) #define AckIntr (13<<11) #define SetIntrEnb (14<<11) #define SetStatusEnb (15<<11) #define SetRxFilter (16<<11) #define SetRxThreshold (17<<11) #define SetTxThreshold (18<<11) #define SetTxStart (19<<11) #define StartDMAUp (20<<11) #define StartDMADown (20<<11)+1 #define StatsEnable (21<<11) #define StatsDisable (22<<11) #define StopCoax (23<<11) #define SetFilterBit (25<<11) /* The SetRxFilter command accepts the following classes */ #define RxStation 1 #define RxMulticast 2 #define RxBroadcast 4 #define RxProm 8 /* 3Com status word defnitions */ #define IntLatch 0x0001 #define HostError 0x0002 #define TxComplete 0x0004 #define TxAvailable 0x0008 #define RxComplete 0x0010 #define RxEarly 0x0020 #define IntReq 0x0040 #define StatsFull 0x0080 #define DMADone (1<<8) #define DownComplete (1<<9) #define UpComplete (1<<10) #define DMAInProgress (1<<11) /* DMA controller is still busy.*/ #define CmdInProgress (1<<12) /* EL3_CMD is still busy.*/ /* Polling Registers */ #define DnPoll 0x2d #define UpPoll 0x3d /* Register window 0 offets */ #define Wn0EepromCmd 10 /* Window 0: EEPROM command register. */ #define Wn0EepromData 12 /* Window 0: EEPROM results register. */ #define IntrStatus 0x0E /* Valid in all windows. */ /* Register window 0 EEPROM bits */ #define EEPROM_Read 0x80 #define EEPROM_WRITE 0x40 #define EEPROM_ERASE 0xC0 #define EEPROM_EWENB 0x30 /* Enable erasing/writing for 10 msec. */ #define EEPROM_EWDIS 0x00 /* Disable EWENB before 10 msec timeout. */ /* EEPROM locations. */ #define PhysAddr01 0 #define PhysAddr23 1 #define PhysAddr45 2 #define ModelID 3 #define EtherLink3ID 7 #define IFXcvrIO 8 #define IRQLine 9 #define NodeAddr01 10 #define NodeAddr23 11 #define NodeAddr45 12 #define DriverTune 13 #define Checksum 15 /* Register window 1 offsets, the window used in normal operation */ #define TX_FIFO 0x10 #define RX_FIFOa 0x10 #define RxErrors 0x14 #define RxStatus 0x18 #define Timer 0x1A #define TxStatus 0x1B #define TxFree 0x1C /* Remaining free bytes in Tx buffer. */ /* Register Window 2 */ #define Wn2_ResetOptions 12 /* Register Window 3: MAC/config bits */ #define Wn3_Config 0 /* Internal Configuration */ #define Wn3_MAC_Ctrl 6 #define Wn3_Options 8 #define BFEXT(value, offset, bitcount) \ ((((unsigned long)(value)) >> (offset)) & ((1 << (bitcount)) - 1)) #define BFINS(lhs, rhs, offset, bitcount) \ (((lhs) & ~((((1 << (bitcount)) - 1)) << (offset))) | \ (((rhs) & ((1 << (bitcount)) - 1)) << (offset))) #define RAM_SIZE(v) BFEXT(v, 0, 3) #define RAM_WIDTH(v) BFEXT(v, 3, 1) #define RAM_SPEED(v) BFEXT(v, 4, 2) #define ROM_SIZE(v) BFEXT(v, 6, 2) #define RAM_SPLIT(v) BFEXT(v, 16, 2) #define XCVR(v) BFEXT(v, 20, 4) #define AUTOSELECT(v) BFEXT(v, 24, 1) /* Register Window 4: Xcvr/media bits */ #define Wn4_FIFODiag 4 #define Wn4_NetDiag 6 #define Wn4_PhysicalMgmt 8 #define Wn4_Media 10 #define Media_SQE 0x0008 /* Enable SQE error counting for AUI. */ #define Media_10TP 0x00C0 /* Enable link beat and jabber for 10baseT. */ #define Media_Lnk 0x0080 /* Enable just link beat for 100TX/100FX. */ #define Media_LnkBeat 0x0800 /* Register Window 7: Bus Master control */ #define Wn7_MasterAddr 0 #define Wn7_MasterLen 6 #define Wn7_MasterStatus 12 /* Boomerang bus master control registers. */ #define PktStatus 0x20 #define DownListPtr 0x24 #define FragAddr 0x28 #define FragLen 0x2c #define TxFreeThreshold 0x2f #define UpPktStatus 0x30 #define UpListPtr 0x38 /* The Rx and Tx descriptor lists. */ #define LAST_FRAG 0x80000000 /* Last Addr/Len pair in descriptor. */ #define DN_COMPLETE 0x00010000 /* This packet has been downloaded */ struct rx_desc_3com { u32 next; /* Last entry points to 0 */ u32 status; /* FSH -> Frame Start Header */ u32 addr; /* Up to 63 addr/len pairs possible */ u32 length; /* Set LAST_FRAG to indicate last pair */ }; /* Values for the Rx status entry. */ #define RxDComplete 0x00008000 #define RxDError 0x4000 #define IPChksumErr (1<<25) #define TCPChksumErr (1<<26) #define UDPChksumErr (1<<27) #define IPChksumValid (1<<29) #define TCPChksumValid (1<<30) #define UDPChksumValid (1<<31) struct tx_desc_3com { u32 next; /* Last entry points to 0 */ u32 status; /* bits 0:12 length, others see below */ u32 addr; u32 length; }; /* Values for the Tx status entry. */ #define CRCDisable 0x2000 #define TxDComplete 0x8000 #define AddIPChksum 0x02000000 #define AddTCPChksum 0x04000000 #define AddUDPChksum 0x08000000 #define TxIntrUploaded 0x80000000 /* IRQ when in FIFO, but maybe not sent. */ /* XCVR Types */ #define XCVR_10baseT 0 #define XCVR_AUI 1 #define XCVR_10baseTOnly 2 #define XCVR_10base2 3 #define XCVR_100baseTx 4 #define XCVR_100baseFx 5 #define XCVR_MII 6 #define XCVR_NWAY 8 #define XCVR_ExtMII 9 #define XCVR_Default 10 /* I don't think this is correct -> should have been 0x10 if Auto Negotiate */ struct descriptor { /* A generic descriptor. */ u32 next; /* Last entry points to 0 */ u32 status; /* FSH -> Frame Start Header */ u32 addr; /* Up to 63 addr/len pairs possible */ u32 length; /* Set LAST_FRAG to indicate last pair */ }; /* Misc. definitions */ #define NUM_RX_DESC PKTBUFSRX * 10 #define NUM_TX_DESC 1 /* Number of TX descriptors */ #define TOUT_LOOP 1000000 #define ETH_ALEN 6 #define EL3WINDOW(dev, win_num) ETH_OUTW(dev, SelectWindow + (win_num), EL3_CMD) #define EL3_CMD 0x0e #define EL3_STATUS 0x0e #undef ETH_DEBUG #ifdef ETH_DEBUG #define PRINTF(fmt,args...) printf (fmt ,##args) #else #define PRINTF(fmt,args...) #endif static struct rx_desc_3com *rx_ring; /* RX descriptor ring */ static struct tx_desc_3com *tx_ring; /* TX descriptor ring */ static u8 rx_buffer[NUM_RX_DESC][PKTSIZE_ALIGN];/* storage for the incoming messages */ static int rx_next = 0; /* RX descriptor ring pointer */ static int tx_next = 0; /* TX descriptor ring pointer */ static int tx_threshold; static void init_rx_ring(struct eth_device* dev); static void purge_tx_ring(struct eth_device* dev); static void read_hw_addr(struct eth_device* dev, bd_t * bis); static int eth_3com_init(struct eth_device* dev, bd_t *bis); static int eth_3com_send(struct eth_device* dev, volatile void *packet, int length); static int eth_3com_recv(struct eth_device* dev); static void eth_3com_halt(struct eth_device* dev); #define io_to_phys(a) pci_io_to_phys((pci_dev_t)dev->priv, a) #define phys_to_io(a) pci_phys_to_io((pci_dev_t)dev->priv, a) #define mem_to_phys(a) pci_mem_to_phys((pci_dev_t)dev->priv, a) #define phys_to_mem(a) pci_phys_to_mem((pci_dev_t)dev->priv, a) static inline int ETH_INL(struct eth_device* dev, u_long addr) { __asm__ volatile ("eieio"); return le32_to_cpu(*(volatile u32 *)io_to_phys(addr + dev->iobase)); } static inline int ETH_INW(struct eth_device* dev, u_long addr) { __asm__ volatile ("eieio"); return le16_to_cpu(*(volatile u16 *)io_to_phys(addr + dev->iobase)); } static inline int ETH_INB(struct eth_device* dev, u_long addr) { __asm__ volatile ("eieio"); return *(volatile u8 *)io_to_phys(addr + dev->iobase); } static inline void ETH_OUTB(struct eth_device* dev, int command, u_long addr) { *(volatile u8 *)io_to_phys(addr + dev->iobase) = command; __asm__ volatile ("eieio"); } static inline void ETH_OUTW(struct eth_device* dev, int command, u_long addr) { *(volatile u16 *)io_to_phys(addr + dev->iobase) = cpu_to_le16(command); __asm__ volatile ("eieio"); } static inline void ETH_OUTL(struct eth_device* dev, int command, u_long addr) { *(volatile u32 *)io_to_phys(addr + dev->iobase) = cpu_to_le32(command); __asm__ volatile ("eieio"); } static inline int ETH_STATUS(struct eth_device* dev) { __asm__ volatile ("eieio"); return le16_to_cpu(*(volatile u16 *)io_to_phys(EL3_STATUS + dev->iobase)); } static inline void ETH_CMD(struct eth_device* dev, int command) { *(volatile u16 *)io_to_phys(EL3_CMD + dev->iobase) = cpu_to_le16(command); __asm__ volatile ("eieio"); } /* Command register is always in the same spot in all the register windows */ /* This function issues a command and waits for it so complete by checking the CmdInProgress bit */ static int issue_and_wait(struct eth_device* dev, int command) { int i, status; ETH_CMD(dev, command); for (i = 0; i < 2000; i++) { status = ETH_STATUS(dev); /*printf ("Issue: status 0x%4x.\n", status); */ if (!(status & CmdInProgress)) return 1; } /* OK, that didn't work. Do it the slow way. One second */ for (i = 0; i < 100000; i++) { status = ETH_STATUS(dev); /*printf ("Issue: status 0x%4x.\n", status); */ return 1; udelay(10); } PRINTF("Ethernet command: 0x%4x did not complete! Status: 0x%4x\n", command, ETH_STATUS(dev) ); return 0; } /* Determine network media type and set up 3com accordingly */ /* I think I'm going to start with something known first like 10baseT */ static int auto_negotiate (struct eth_device *dev) { int i; EL3WINDOW (dev, 1); /* Wait for Auto negotiation to complete */ for (i = 0; i <= 1000; i++) { if (ETH_INW (dev, 2) & 0x04) break; udelay (100); if (i == 1000) { PRINTF ("Error: Auto negotiation failed\n"); return 0; } } return 1; } void eth_interrupt (struct eth_device *dev) { u16 status = ETH_STATUS (dev); printf ("eth0: status = 0x%04x\n", status); if (!(status & IntLatch)) return; if (status & (1 << 6)) { ETH_CMD (dev, AckIntr | (1 << 6)); printf ("Acknowledged Interrupt command\n"); } if (status & DownComplete) { ETH_CMD (dev, AckIntr | DownComplete); printf ("Acknowledged DownComplete\n"); } if (status & UpComplete) { ETH_CMD (dev, AckIntr | UpComplete); printf ("Acknowledged UpComplete\n"); } ETH_CMD (dev, AckIntr | IntLatch); printf ("Acknowledged IntLatch\n"); } int eth_3com_initialize (bd_t * bis) { u32 eth_iobase = 0, status; int card_number = 0, ret; struct eth_device *dev; pci_dev_t devno; char *s; s = getenv ("3com_base"); /* Find ethernet controller on the PCI bus */ if ((devno = pci_find_device (PCI_VENDOR_ID_3COM, PCI_DEVICE_ID_3COM_3C905C, 0)) < 0) { PRINTF ("Error: Cannot find the ethernet device on the PCI bus\n"); goto Done; } if (s) { unsigned long base = atoi (s); pci_write_config_dword (devno, PCI_BASE_ADDRESS_0, base | 0x01); } ret = pci_read_config_dword (devno, PCI_BASE_ADDRESS_0, ð_iobase); eth_iobase &= ~0xf; PRINTF ("eth: 3Com Found at Address: 0x%x\n", eth_iobase); pci_write_config_dword (devno, PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); /* Check if I/O accesses and Bus Mastering are enabled */ ret = pci_read_config_dword (devno, PCI_COMMAND, &status); if (!(status & PCI_COMMAND_IO)) { printf ("Error: Cannot enable IO access.\n"); goto Done; } if (!(status & PCI_COMMAND_MEMORY)) { printf ("Error: Cannot enable MEMORY access.\n"); goto Done; } if (!(status & PCI_COMMAND_MASTER)) { printf ("Error: Cannot enable Bus Mastering.\n"); goto Done; } dev = (struct eth_device *) malloc (sizeof (*dev)); /*struct eth_device)); */ sprintf (dev->name, "3Com 3c920c#%d", card_number); dev->iobase = eth_iobase; dev->priv = (void *) devno; dev->init = eth_3com_init; dev->halt = eth_3com_halt; dev->send = eth_3com_send; dev->recv = eth_3com_recv; eth_register (dev); /* { */ /* char interrupt; */ /* devno = pci_find_device(PCI_VENDOR_ID_3COM, PCI_DEVICE_ID_3COM_3C905C, 0); */ /* pci_read_config_byte(devno, PCI_INTERRUPT_LINE, &interrupt); */ /* printf("Installing eth0 interrupt handler to %d\n", interrupt); */ /* irq_install_handler(interrupt, eth_interrupt, dev); */ /* } */ card_number++; /* Set the latency timer for value */ s = getenv ("3com_latency"); if (s) { ret = pci_write_config_byte (devno, PCI_LATENCY_TIMER, (unsigned char) atoi (s)); } else ret = pci_write_config_byte (devno, PCI_LATENCY_TIMER, 0x0a); read_hw_addr (dev, bis); /* get the MAC address from Window 2 */ /* Reset the ethernet controller */ PRINTF ("Issuing reset command....\n"); if (!issue_and_wait (dev, TotalReset)) { printf ("Error: Cannot reset ethernet controller.\n"); goto Done; } else PRINTF ("Ethernet controller reset.\n"); /* allocate memory for rx and tx rings */ if (!(rx_ring = memalign (sizeof (struct rx_desc_3com) * NUM_RX_DESC, 16))) { PRINTF ("Cannot allocate memory for RX_RING.....\n"); goto Done; } if (!(tx_ring = memalign (sizeof (struct tx_desc_3com) * NUM_TX_DESC, 16))) { PRINTF ("Cannot allocate memory for TX_RING.....\n"); goto Done; } Done: return status; } static int eth_3com_init (struct eth_device *dev, bd_t * bis) { int i, status = 0; int tx_cur, loop; u16 status_enable, intr_enable; struct descriptor *ias_cmd; /* Determine what type of network the machine is connected to */ /* presently drops the connect to 10Mbps */ if (!auto_negotiate (dev)) { printf ("Error: Cannot determine network media.\n"); goto Done; } issue_and_wait (dev, TxReset); issue_and_wait (dev, RxReset | 0x04); /* Switch to register set 7 for normal use. */ EL3WINDOW (dev, 7); /* Initialize Rx and Tx rings */ init_rx_ring (dev); purge_tx_ring (dev); ETH_CMD (dev, SetRxFilter | RxStation | RxBroadcast | RxProm); issue_and_wait (dev, SetTxStart | 0x07ff); /* Below sets which indication bits to be seen. */ status_enable = SetStatusEnb | HostError | DownComplete | UpComplete | (1 << 6); ETH_CMD (dev, status_enable); /* Below sets no bits are to cause an interrupt since this is just polling */ intr_enable = SetIntrEnb; /* intr_enable = SetIntrEnb | (1<<9) | (1<<10) | (1<<6); */ ETH_CMD (dev, intr_enable); ETH_OUTB (dev, 127, UpPoll); /* Ack all pending events, and set active indicator mask */ ETH_CMD (dev, AckIntr | IntLatch | TxAvailable | RxEarly | IntReq); ETH_CMD (dev, intr_enable); /* Tell the adapter where the RX ring is located */ issue_and_wait (dev, UpStall); /* Stall and set the UplistPtr */ ETH_OUTL (dev, (u32) & rx_ring[rx_next], UpListPtr); ETH_CMD (dev, RxEnable); /* Enable the receiver. */ issue_and_wait (dev, UpUnstall); /* Send the Individual Address Setup frame */ tx_cur = tx_next; tx_next = ((tx_next + 1) % NUM_TX_DESC); ias_cmd = (struct descriptor *) &tx_ring[tx_cur]; ias_cmd->status = cpu_to_le32 (1 << 31); /* set DnIndicate bit. */ ias_cmd->next = 0; ias_cmd->addr = cpu_to_le32 ((u32) dev->enetaddr); ias_cmd->length = cpu_to_le32 (6 | LAST_FRAG); /* Tell the adapter where the TX ring is located */ ETH_CMD (dev, TxEnable); /* Enable transmitter. */ issue_and_wait (dev, DownStall); /* Stall and set the DownListPtr. */ ETH_OUTL (dev, (u32) & tx_ring[tx_cur], DownListPtr); issue_and_wait (dev, DownUnstall); for (i = 0; !(ETH_STATUS (dev) & DownComplete); i++) { if (i >= TOUT_LOOP) { PRINTF ("TX Ring status (Init): 0x%4x\n", le32_to_cpu (tx_ring[tx_cur].status)); PRINTF ("ETH_STATUS: 0x%x\n", ETH_STATUS (dev)); goto Done; } } if (ETH_STATUS (dev) & DownComplete) { /* If DownLoad Complete ACK the bit */ ETH_CMD (dev, AckIntr | DownComplete); /* acknowledge the indication bit */ issue_and_wait (dev, DownStall); /* stall and clear DownListPtr */ ETH_OUTL (dev, 0, DownListPtr); issue_and_wait (dev, DownUnstall); } status = 1; Done: return status; } int eth_3com_send (struct eth_device *dev, volatile void *packet, int length) { int i, status = 0; int tx_cur; if (length <= 0) { PRINTF ("eth: bad packet size: %d\n", length); goto Done; } tx_cur = tx_next; tx_next = (tx_next + 1) % NUM_TX_DESC; tx_ring[tx_cur].status = cpu_to_le32 (1 << 31); /* set DnIndicate bit */ tx_ring[tx_cur].next = 0; tx_ring[tx_cur].addr = cpu_to_le32 (((u32) packet)); tx_ring[tx_cur].length = cpu_to_le32 (length | LAST_FRAG); /* Send the packet */ issue_and_wait (dev, DownStall); /* stall and set the DownListPtr */ ETH_OUTL (dev, (u32) & tx_ring[tx_cur], DownListPtr); issue_and_wait (dev, DownUnstall); for (i = 0; !(ETH_STATUS (dev) & DownComplete); i++) { if (i >= TOUT_LOOP) { PRINTF ("TX Ring status (send): 0x%4x\n", le32_to_cpu (tx_ring[tx_cur].status)); goto Done; } } if (ETH_STATUS (dev) & DownComplete) { /* If DownLoad Complete ACK the bit */ ETH_CMD (dev, AckIntr | DownComplete); /* acknowledge the indication bit */ issue_and_wait (dev, DownStall); /* stall and clear DownListPtr */ ETH_OUTL (dev, 0, DownListPtr); issue_and_wait (dev, DownUnstall); } status = 1; Done: return status; } void PrintPacket (uchar * packet, int length) { int loop; uchar *ptr; printf ("Printing packet of length %x.\n\n", length); ptr = packet; for (loop = 1; loop <= length; loop++) { printf ("%2x ", *ptr++); if ((loop % 40) == 0) printf ("\n"); } } int eth_3com_recv (struct eth_device *dev) { u16 stat = 0; u32 status; int rx_prev, length = 0; while (!(ETH_STATUS (dev) & UpComplete)) /* wait on receipt of packet */ ; status = le32_to_cpu (rx_ring[rx_next].status); /* packet status */ while (status & (1 << 15)) { /* A packet has been received */ if (status & (1 << 15)) { /* A valid frame received */ length = le32_to_cpu (rx_ring[rx_next].status) & 0x1fff; /* length is in bits 0 - 12 */ /* Pass the packet up to the protocol layers */ NetReceive ((uchar *) le32_to_cpu (rx_ring[rx_next].addr), length); rx_ring[rx_next].status = 0; /* clear the status word */ ETH_CMD (dev, AckIntr | UpComplete); issue_and_wait (dev, UpUnstall); } else if (stat & HostError) { /* There was an error */ printf ("Rx error status: 0x%4x\n", stat); init_rx_ring (dev); goto Done; } rx_prev = rx_next; rx_next = (rx_next + 1) % NUM_RX_DESC; stat = ETH_STATUS (dev); /* register status */ status = le32_to_cpu (rx_ring[rx_next].status); /* packet status */ } Done: return length; } void eth_3com_halt (struct eth_device *dev) { if (!(dev->iobase)) { goto Done; } issue_and_wait (dev, DownStall); /* shut down transmit and receive */ issue_and_wait (dev, UpStall); issue_and_wait (dev, RxDisable); issue_and_wait (dev, TxDisable); /* free(tx_ring); /###* release memory allocated to the DPD and UPD rings */ /* free(rx_ring); */ Done: return; } static void init_rx_ring (struct eth_device *dev) { int i; PRINTF ("Initializing rx_ring. rx_buffer = %p\n", rx_buffer); issue_and_wait (dev, UpStall); for (i = 0; i < NUM_RX_DESC; i++) { rx_ring[i].next = cpu_to_le32 (((u32) & rx_ring[(i + 1) % NUM_RX_DESC])); rx_ring[i].status = 0; rx_ring[i].addr = cpu_to_le32 (((u32) & rx_buffer[i][0])); rx_ring[i].length = cpu_to_le32 (PKTSIZE_ALIGN | LAST_FRAG); } rx_next = 0; } static void purge_tx_ring (struct eth_device *dev) { int i; PRINTF ("Purging tx_ring.\n"); tx_next = 0; for (i = 0; i < NUM_TX_DESC; i++) { tx_ring[i].next = 0; tx_ring[i].status = 0; tx_ring[i].addr = 0; tx_ring[i].length = 0; } } static void read_hw_addr (struct eth_device *dev, bd_t * bis) { u8 hw_addr[ETH_ALEN]; unsigned int eeprom[0x40]; unsigned int checksum = 0; int i, j, timer; /* First, try the env ... if that works, we're all done! */ if (eth_getenv_enetaddr("ethaddr", hw_addr)) goto Done; /* Read the station address from the EEPROM. */ EL3WINDOW (dev, 0); for (i = 0; i < 0x40; i++) { ETH_OUTW (dev, EEPROM_Read + i, Wn0EepromCmd); /* Pause for at least 162 us. for the read to take place. */ for (timer = 10; timer >= 0; timer--) { udelay (162); if ((ETH_INW (dev, Wn0EepromCmd) & 0x8000) == 0) break; } eeprom[i] = ETH_INW (dev, Wn0EepromData); } /* Checksum calculation. I'm not sure about this part and there seems to be a bug on the 3com side of things */ for (i = 0; i < 0x21; i++) checksum ^= eeprom[i]; checksum = (checksum ^ (checksum >> 8)) & 0xff; if (checksum != 0xbb) printf (" *** INVALID EEPROM CHECKSUM %4.4x *** \n", checksum); for (i = 0, j = 0; i < 3; i++) { hw_addr[j++] = (u8) ((eeprom[i + 10] >> 8) & 0xff); hw_addr[j++] = (u8) (eeprom[i + 10] & 0xff); } /* MAC Address is in window 2, write value from EEPROM to window 2 */ EL3WINDOW (dev, 2); for (i = 0; i < 6; i++) ETH_OUTB (dev, hw_addr[i], i); for (j = 0; j < ETH_ALEN; j += 2) { hw_addr[j] = (u8) (ETH_INW (dev, j) & 0xff); hw_addr[j + 1] = (u8) ((ETH_INW (dev, j) >> 8) & 0xff); } /* Save the result in the environment */ eth_setenv_enetaddr("ethaddr", hw_addr); Done: memcpy(dev->enetaddr, hw_addr, 6); return; }