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added cable magic for 100Mps in natsemi

This commit is contained in:
Udayan Kumar 2007-07-10 13:29:30 -04:00
parent 11d246f3b5
commit 751cb2e450
1 changed files with 70 additions and 6 deletions
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76
src/drivers/net/natsemi.c
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@ -169,6 +169,15 @@ enum register_offsets {
};
/* the values for the 'magic' registers above (PGSEL=1) */
#define PMDCSR_VAL 0x189c /* enable preferred adaptation circuitry */
#define TSTDAT_VAL 0x0
#define DSPCFG_VAL 0x5040
#define SDCFG_VAL 0x008c /* set voltage thresholds for Signal Detect */
#define DSPCFG_LOCK 0x20 /* coefficient lock bit in DSPCFG */
#define DSPCFG_COEF 0x1000 /* see coefficient (in TSTDAT) bit in DSPCFG */
#define TSTDAT_FIXED 0xe8 /* magic number for bad coefficients */
/* Bit in ChipCmd.
*/
enum ChipCmdBits {
@ -181,6 +190,20 @@ enum ChipCmdBits {
TxOn = 0x01
};
enum ChipConfig_bits {
CfgPhyDis = 0x200,
CfgPhyRst = 0x400,
CfgExtPhy = 0x1000,
CfgAnegEnable = 0x2000,
CfgAneg100 = 0x4000,
CfgAnegFull = 0x8000,
CfgAnegDone = 0x8000000,
CfgFullDuplex = 0x20000000,
CfgSpeed100 = 0x40000000,
CfgLink = 0x80000000,
};
/* Bits in the RxMode register.
*/
enum rx_mode_bits {
@ -328,6 +351,41 @@ static void nat_reset ( struct natsemi_nic *nat ) {
outl ( SavedClkRun, nat->ioaddr + ClkRun );
}
static void do_cable_magic ( struct net_device *netdev ) {
struct natsemi_nic *nat = netdev->priv;
uint16_t data;
/*
* 100 MBit links with short cables can trip an issue with the chip.
* The problem manifests as lots of CRC errors and/or flickering
* activity LED while idle. This process is based on instructions
* from engineers at National.
*/
if (inl(nat->ioaddr + ChipConfig) & CfgSpeed100) {
outw(1, nat->ioaddr + PGSEL);
/*
* coefficient visibility should already be enabled via
* DSPCFG | 0x1000
*/
data = inw(nat->ioaddr + TSTDAT) & 0xff;
/*
* the value must be negative, and within certain values
* (these values all come from National)
*/
if (!(data & 0x80) || ((data >= 0xd8) && (data <= 0xff))) {
/* the bug has been triggered - fix the coefficient */
outw(TSTDAT_FIXED, nat->ioaddr + TSTDAT);
/* lock the value */
data = inw(nat->ioaddr + DSPCFG);
//np->dspcfg = data | DSPCFG_LOCK;
outw(data | DSPCFG_LOCK , nat->ioaddr + DSPCFG);
}
outw(0, nat->ioaddr + PGSEL);
}
}
/*
* Open NIC
*
@ -401,13 +459,13 @@ static int nat_open ( struct net_device *netdev ) {
* Configure for standard, in-spec Ethernet.
*/
if ( inl ( nat->ioaddr + ChipConfig ) & 0x20000000 ) { /* Full duplex */
tx_config = 0xD0801002|0xC0000000;
DBG("Full duplex\n");
rx_config = 0x10000020|0x10000000;;
tx_config = 0xD0801002 | 0xC0000000;
DBG ( "Full duplex\n" );
rx_config = 0x10000020 | 0x10000000;
} else {
tx_config = 0x10801002& ~0xC0000000;;
DBG("Half duplex\n");
rx_config = 0x0020& ~0x10000000;;;
tx_config = 0x10801002 & ~0xC0000000;
DBG ( "Half duplex\n" );
rx_config = 0x0020 & ~0x10000000;
}
outl ( tx_config, nat->ioaddr + TxConfig );
outl ( rx_config, nat->ioaddr + RxConfig );
@ -415,6 +473,12 @@ static int nat_open ( struct net_device *netdev ) {
/*start the receiver
*/
outl ( RxOn, nat->ioaddr + ChipCmd );
/* lines 1586 linux-natsemi.c uses cable magic
* testing this feature is required or not
*/
do_cable_magic ( netdev );
/* mask the interrupts. note interrupt is not enabled here
*/