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u-boot/board/MAI/AmigaOneG3SE/enet.c
Peter Tyser 54e822f959 Replace __asm references with __asm__ 
__asm__ follows gcc's documented syntax and is generally more common
than __asm.  This change is only asthetic and should not affect
functionality.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-04-28 01:02:04 +02:00

840 lines
22 KiB
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/*
* (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 <netdev.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_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, &eth_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;
}
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