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Diffstat (limited to 'board/MAI/AmigaOneG3SE/enet.c')
| -rwxr-xr-x | board/MAI/AmigaOneG3SE/enet.c | 884 |
1 files changed, 884 insertions, 0 deletions
diff --git a/board/MAI/AmigaOneG3SE/enet.c b/board/MAI/AmigaOneG3SE/enet.c new file mode 100755 index 0000000..d4be889 --- /dev/null +++ b/board/MAI/AmigaOneG3SE/enet.c @@ -0,0 +1,884 @@ +/* + * (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 <common.h> +#include <malloc.h> +#include <net.h> +#include <asm/io.h> +#include <pci.h> + +#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_FIFO 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)&bis->bi_enetaddr[0]); + 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; + + /* 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); + } + + for (i=0;i<ETH_ALEN;i++) + { + if (hw_addr[i] != bis->bi_enetaddr[i]) + { +/* printf("Warning: HW address don't match:\n"); */ +/* printf("Address in 3Com Window 2 is " */ +/* "%02X:%02X:%02X:%02X:%02X:%02X\n", */ +/* hw_addr[0], hw_addr[1], hw_addr[2], */ +/* hw_addr[3], hw_addr[4], hw_addr[5]); */ +/* printf("Address used by U-Boot is " */ +/* "%02X:%02X:%02X:%02X:%02X:%02X\n", */ +/* bis->bi_enetaddr[0], bis->bi_enetaddr[1], */ +/* bis->bi_enetaddr[2], bis->bi_enetaddr[3], */ +/* bis->bi_enetaddr[4], bis->bi_enetaddr[5]); */ +/* goto Done; */ + char buffer[256]; + if (bis->bi_enetaddr[0] == 0 && bis->bi_enetaddr[1] == 0 && + bis->bi_enetaddr[2] == 0 && bis->bi_enetaddr[3] == 0 && + bis->bi_enetaddr[4] == 0 && bis->bi_enetaddr[5] == 0) + { + + sprintf(buffer, "%02X:%02X:%02X:%02X:%02X:%02X", + hw_addr[0], hw_addr[1], hw_addr[2], + hw_addr[3], hw_addr[4], hw_addr[5]); + setenv("ethaddr", buffer); + } + } + } + + for(i=0; i<ETH_ALEN; i++) dev->enetaddr[i] = hw_addr[i]; + +Done: + return; +} |