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minix3/drivers/net/dpeth/3c509.c

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/*
** File: 3c509.c Jun. 01, 2000
**
** Author: Giovanni Falzoni <gfalzoni@inwind.it>
**
** This file contains specific implementation of the ethernet
** device driver for 3Com Etherlink III (3c509) boards.
** NOTE: The board has to be setup to disable PnP and to assign
** I/O base and IRQ. The driver is for ISA bus only
*/
#include <minix/drivers.h>
#include <minix/com.h>
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include "dp.h"
#if (ENABLE_3C509 == 1)
#include "3c509.h"
static const char *const IfNamesMsg[] = {
"10BaseT", "AUI", "unknown", "BNC",
};
/*
** Name: void el3_update_stats(dpeth_t *dep)
** Function: Reads statistic counters from board
** and updates local counters.
*/
static void el3_update_stats(dpeth_t * dep)
{
/* Disables statistics while reading and switches to the correct window */
outw_el3(dep, REG_CmdStatus, CMD_StatsDisable);
SetWindow(WNO_Statistics);
/* Reads everything, adding values to the local counters */
dep->de_stat.ets_sendErr += inb_el3(dep, REG_TxCarrierLost); /* Reg. 00 */
dep->de_stat.ets_sendErr += inb_el3(dep, REG_TxNoCD); /* Reg. 01 */
dep->de_stat.ets_collision += inb_el3(dep, REG_TxMultColl); /* Reg. 02 */
dep->de_stat.ets_collision += inb_el3(dep, REG_TxSingleColl); /* Reg. 03 */
dep->de_stat.ets_collision += inb_el3(dep, REG_TxLate); /* Reg. 04 */
dep->de_stat.ets_recvErr += inb_el3(dep, REG_RxDiscarded); /* Reg. 05 */
dep->de_stat.ets_packetT += inb_el3(dep, REG_TxFrames); /* Reg. 06 */
dep->de_stat.ets_packetR += inb_el3(dep, REG_RxFrames); /* Reg. 07 */
dep->de_stat.ets_transDef += inb_el3(dep, REG_TxDefer); /* Reg. 08 */
dep->bytes_Rx += (unsigned) inw_el3(dep, REG_RxBytes); /* Reg. 10 */
dep->bytes_Tx += (unsigned) inw_el3(dep, REG_TxBytes); /* Reg. 12 */
/* Goes back to operating window and enables statistics */
SetWindow(WNO_Operating);
outw_el3(dep, REG_CmdStatus, CMD_StatsEnable);
return;
}
/*
** Name: void el3_getstats(dpeth_t *dep)
** Function: Reads statistics counters from board.
*/
static void el3_getstats(dpeth_t * dep)
{
lock();
el3_update_stats(dep);
unlock();
return;
}
/*
** Name: void el3_dodump(dpeth_t *dep)
** Function: Dumps counter on screen (support for console display).
*/
static void el3_dodump(dpeth_t * dep)
{
el3_getstats(dep);
return;
}
/*
** Name: void el3_rx_mode(dpeth_t *dep)
** Function: Initializes receiver mode
*/
static void el3_rx_mode(dpeth_t * dep)
{
dep->de_recv_mode = FilterIndividual;
if (dep->de_flags & DEF_BROAD) dep->de_recv_mode |= FilterBroadcast;
if (dep->de_flags & DEF_MULTI) dep->de_recv_mode |= FilterMulticast;
if (dep->de_flags & DEF_PROMISC) dep->de_recv_mode |= FilterPromiscuous;
outw_el3(dep, REG_CmdStatus, CMD_RxReset);
outw_el3(dep, REG_CmdStatus, CMD_SetRxFilter | dep->de_recv_mode);
outw_el3(dep, REG_CmdStatus, CMD_RxEnable);
return;
}
/*
** Name: void el3_reset(dpeth_t *dep)
** Function: Reset function specific for Etherlink hardware.
*/
static void el3_reset(dpeth_t * UNUSED(dep))
{
return; /* Done */
}
/*
** Name: void el3_write_fifo(dpeth_t * dep, int pktsize);
** Function: Writes a packet from user area to board.
** Remark: Writing a word/dword at a time may result faster
** but is a lot more complicated. Let's go simpler way.
*/
static void el3_write_fifo(dpeth_t * dep, int pktsize)
{
int bytes, ix = 0;
iovec_dat_s_t *iovp = &dep->de_write_iovec;
int r, padding = pktsize;
do { /* Writes chuncks of packet from user buffers */
bytes = iovp->iod_iovec[ix].iov_size; /* Size of buffer */
if (bytes > pktsize) bytes = pktsize;
/* Writes from user buffer to Tx FIFO */
r= sys_safe_outsb(dep->de_data_port, iovp->iod_proc_nr,
iovp->iod_iovec[ix].iov_grant, 0, bytes);
if (r != OK)
panic("el3_write_fifo: sys_safe_outsb failed: %d", r);
if (++ix >= IOVEC_NR) { /* Next buffer of IO vector */
dp_next_iovec(iovp);
ix = 0;
}
/* Till packet done */
} while ((pktsize -= bytes) > 0);
while ((padding++ % sizeof(long)) != 0) outb(dep->de_data_port, 0x00);
return;
}
/*
** Name: void el3_recv(dpeth_t *dep, int fromint, int size)
** Function: Receive function. Called from interrupt handler or
** from main to unload recv. buffer (packet to client)
*/
static void el3_recv(dpeth_t *dep, int fromint, int size)
{
buff_t *rxptr;
while ((dep->de_flags & DEF_READING) && (rxptr = dep->de_recvq_head)) {
lock(); /* Remove buffer from queue */
if (dep->de_recvq_tail == dep->de_recvq_head)
dep->de_recvq_head = dep->de_recvq_tail = NULL;
else
dep->de_recvq_head = rxptr->next;
unlock();
/* Copy buffer to user area and free it */
mem2user(dep, rxptr);
dep->de_read_s = rxptr->size;
dep->de_flags |= DEF_ACK_RECV;
dep->de_flags &= NOT(DEF_READING);
/* Return buffer to the idle pool */
free_buff(dep, rxptr);
}
return;
}
/*
** Name: void el3_rx_complete(dpeth_t * dep);
** Function: Upon receiving a packet, provides status checks
** and if packet is OK copies it to local buffer.
*/
static void el3_rx_complete(dpeth_t * dep)
{
short int RxStatus;
int pktsize;
buff_t *rxptr;
RxStatus = inw_el3(dep, REG_RxStatus);
pktsize = RxStatus & RXS_Length; /* Mask off packet length */
if (RxStatus & RXS_Error) {
/* First checks for receiving errors */
RxStatus &= RXS_ErrType;
switch (RxStatus) { /* Bad packet (see error type) */
case RXS_Dribble:
case RXS_Oversize:
case RXS_Runt: dep->de_stat.ets_recvErr += 1; break;
case RXS_Overrun: dep->de_stat.ets_OVW += 1; break;
case RXS_Framing: dep->de_stat.ets_frameAll += 1; break;
case RXS_CRC: dep->de_stat.ets_CRCerr += 1; break;
}
} else if ((rxptr = alloc_buff(dep, pktsize + sizeof(buff_t))) == NULL) {
/* Memory not available. Drop packet */
dep->de_stat.ets_fifoOver += 1;
} else {
/* Good packet. Read it from FIFO */
insb(dep->de_data_port, SELF, rxptr->buffer, pktsize);
rxptr->next = NULL;
rxptr->size = pktsize;
lock(); /* Queue packet to receive queue */
if (dep->de_recvq_head == NULL)
dep->de_recvq_head = rxptr;
else
dep->de_recvq_tail->next = rxptr;
dep->de_recvq_tail = rxptr;
unlock();
/* Reply to pending Receive requests, if any */
el3_recv(dep, TRUE, pktsize);
}
/* Discard top packet from queue */
outw_el3(dep, REG_CmdStatus, CMD_RxDiscard);
return;
}
/*
** Name: void el3_send(dpeth_t *dep, int count)
** Function: Send function. Called from main to transit a packet or
** from interrupt handler when Tx FIFO gets available.
*/
static void el3_send(dpeth_t * dep, int from_int, int count)
{
clock_t now;
int ix;
short int TxStatus;
getticks(&now);
if ((dep->de_flags & DEF_XMIT_BUSY) &&
(now - dep->de_xmit_start) > 4) {
DEBUG(printf("3c509: Transmitter timed out. Resetting ....\n");)
dep->de_stat.ets_sendErr += 1;
/* Resets and restars the transmitter */
outw_el3(dep, REG_CmdStatus, CMD_TxReset);
outw_el3(dep, REG_CmdStatus, CMD_TxEnable);
dep->de_flags &= NOT(DEF_XMIT_BUSY);
}
if (!(dep->de_flags & DEF_XMIT_BUSY)) {
/* Writes Transmitter preamble 1st Word (packet len, no ints) */
outw_el3(dep, REG_TxFIFO, count);
/* Writes Transmitter preamble 2nd Word (all zero) */
outw_el3(dep, REG_TxFIFO, 0);
/* Writes packet */
el3_write_fifo(dep, count);
getticks(&dep->de_xmit_start);
dep->de_flags |= (DEF_XMIT_BUSY | DEF_ACK_SEND);
if (inw_el3(dep, REG_TxFree) > ETH_MAX_PACK_SIZE) {
/* Tx has enough room for a packet of maximum size */
dep->de_flags &= NOT(DEF_XMIT_BUSY | DEF_SENDING);
} else {
/* Interrupt driver when enough room is available */
outw_el3(dep, REG_CmdStatus, CMD_SetTxAvailable | ETH_MAX_PACK_SIZE);
dep->de_flags &= NOT(DEF_SENDING);
}
/* Pops Tx status stack */
for (ix = 4; --ix && (TxStatus = inb_el3(dep, REG_TxStatus)) > 0;) {
if (TxStatus & 0x38) dep->de_stat.ets_sendErr += 1;
if (TxStatus & 0x30)
outw_el3(dep, REG_CmdStatus, CMD_TxReset);
if (TxStatus & 0x3C)
outw_el3(dep, REG_CmdStatus, CMD_TxEnable);
outb_el3(dep, REG_TxStatus, 0);
}
}
return;
}
/*
** Name: void el3_close(dpeth_t *dep)
** Function: Stops board and makes it ready to shut down.
*/
static void el3_close(dpeth_t * dep)
{
/* Disables statistics, Receiver and Transmitter */
outw_el3(dep, REG_CmdStatus, CMD_StatsDisable);
outw_el3(dep, REG_CmdStatus, CMD_RxDisable);
outw_el3(dep, REG_CmdStatus, CMD_TxDisable);
if (dep->de_if_port == BNC_XCVR) {
outw_el3(dep, REG_CmdStatus, CMD_StopIntXcvr);
/* milli_delay(5); */
} else if (dep->de_if_port == TP_XCVR) {
SetWindow(WNO_Diagnostics);
outw_el3(dep, REG_MediaStatus, inw_el3(dep, REG_MediaStatus) &
NOT((MediaLBeatEnable | MediaJabberEnable)));
/* milli_delay(5); */
}
DEBUG(printf("%s: stopping Etherlink ... \n", dep->de_name));
/* Issues a global reset
outw_el3(dep, REG_CmdStatus, CMD_GlobalReset); */
sys_irqdisable(&dep->de_hook); /* Disable interrupt */
return;
}
/*
** Name: void el3_interrupt(dpeth_t *dep)
** Function: Interrupt handler. Acknwledges transmit interrupts
** or unloads receive buffer to memory queue.
*/
static void el3_interrupt(dpeth_t * dep)
{
int loop;
unsigned short isr;
for (loop = 5; loop > 0 && ((isr = inw_el3(dep, REG_CmdStatus)) &
(INT_Latch | INT_RxComplete | INT_UpdateStats)); loop -= 1) {
if (isr & INT_RxComplete) /* Got a new packet */
el3_rx_complete(dep);
if (isr & INT_TxAvailable) { /* Tx has room for big packets */
DEBUG(printf("3c509: got Tx interrupt, Status=0x%04x\n", isr);)
dep->de_flags &= NOT(DEF_XMIT_BUSY);
outw_el3(dep, REG_CmdStatus, CMD_Acknowledge | INT_TxAvailable);
if (dep->de_flags & DEF_SENDING) /* Send pending */
el3_send(dep, TRUE, dep->de_send_s);
}
if (isr & (INT_AdapterFail | INT_RxEarly | INT_UpdateStats)) {
if (isr & INT_UpdateStats) /* Empties statistics */
el3_getstats(dep);
if (isr & INT_RxEarly) /* Not really used. Do nothing */
outw_el3(dep, REG_CmdStatus, CMD_Acknowledge | (INT_RxEarly));
if (isr & INT_AdapterFail) {
/* Adapter error. Reset and re-enable receiver */
DEBUG(printf("3c509: got Rx fail interrupt, Status=0x%04x\n", isr);)
el3_rx_mode(dep);
outw_el3(dep, REG_CmdStatus, CMD_Acknowledge | INT_AdapterFail);
}
}
/* Acknowledge interrupt */
outw_el3(dep, REG_CmdStatus, CMD_Acknowledge | (INT_Latch | INT_Requested));
}
return;
}
/*
** Name: unsigned el3_read_eeprom(port_t port, unsigned address);
** Function: Reads the EEPROM at specified address
*/
static unsigned el3_read_eeprom(port_t port, unsigned address)
{
unsigned int result;
int bit;
address |= EL3_READ_EEPROM;
outb(port, address);
milli_delay(5); /* Allows EEPROM reads */
for (result = 0, bit = 16; bit > 0; bit -= 1) {
result = (result << 1) | (inb(port) & 0x0001);
}
return result;
}
/*
** Name: void el3_read_StationAddress(dpeth_t *dep)
** Function: Reads station address from board
*/
static void el3_read_StationAddress(dpeth_t * dep)
{
unsigned int ix, rc;
for (ix = EE_3COM_NODE_ADDR; ix < SA_ADDR_LEN+EE_3COM_NODE_ADDR;) {
/* Accesses with word No. */
rc = el3_read_eeprom(dep->de_id_port, ix / 2);
/* Swaps bytes of word */
dep->de_address.ea_addr[ix++] = (rc >> 8) & 0xFF;
dep->de_address.ea_addr[ix++] = rc & 0xFF;
}
return;
}
/*
** Name: void el3_open(dpeth_t *dep)
** Function: Initalizes board hardware and driver data structures.
*/
static void el3_open(dpeth_t * dep)
{
unsigned int AddrCfgReg, ResCfgReg;
unsigned int ix;
el3_read_StationAddress(dep); /* Get ethernet address */
/* Get address and resource configurations */
AddrCfgReg = el3_read_eeprom(dep->de_id_port, EE_ADDR_CFG);
ResCfgReg = el3_read_eeprom(dep->de_id_port, EE_RESOURCE_CFG);
outb(dep->de_id_port, EL3_ACTIVATE); /* Activate the board */
/* Gets xcvr configuration */
dep->de_if_port = AddrCfgReg & EL3_CONFIG_XCVR_MASK;
AddrCfgReg = ((AddrCfgReg & EL3_CONFIG_IOBASE_MASK) << 4) + EL3_IO_BASE_ADDR;
if (AddrCfgReg != dep->de_base_port)
panic("Bad I/O port for Etherlink board");
ResCfgReg >>= 12;
dep->de_irq &= NOT(DEI_DEFAULT); /* Strips the default flag */
if (ResCfgReg != dep->de_irq) panic("Bad IRQ for Etherlink board");
SetWindow(WNO_Setup);
/* Reset transmitter and receiver */
outw_el3(dep, REG_CmdStatus, CMD_TxReset);
outw_el3(dep, REG_CmdStatus, CMD_RxReset);
/* Enable the adapter */
outb_el3(dep, REG_CfgControl, EL3_EnableAdapter);
/* Disable Status bits */
outw_el3(dep, REG_CmdStatus, CMD_SetStatusEnab + 0x00);
/* Set "my own" address */
SetWindow(WNO_StationAddress);
for (ix = 0; ix < 6; ix += 1)
outb_el3(dep, REG_SA0_1 + ix, dep->de_address.ea_addr[ix]);
/* Start Transceivers as required */
if (dep->de_if_port == BNC_XCVR) {
/* Start internal transceiver for Coaxial cable */
outw_el3(dep, REG_CmdStatus, CMD_StartIntXcvr);
milli_delay(5);
} else if (dep->de_if_port == TP_XCVR) {
/* Start internal transceiver for Twisted pair cable */
SetWindow(WNO_Diagnostics);
outw_el3(dep, REG_MediaStatus,
inw_el3(dep, REG_MediaStatus) | (MediaLBeatEnable | MediaJabberEnable));
}
/* Switch to the statistic window, and clear counts (by reading) */
SetWindow(WNO_Statistics);
for (ix = REG_TxCarrierLost; ix <= REG_TxDefer; ix += 1) inb_el3(dep, ix);
inw_el3(dep, REG_RxBytes);
inw_el3(dep, REG_TxBytes);
/* Switch to operating window for normal use */
SetWindow(WNO_Operating);
/* Receive individual address & broadcast. (Mofified later by rx_mode) */
outw_el3(dep, REG_CmdStatus, CMD_SetRxFilter |
(FilterIndividual | FilterBroadcast));
/* Turn on statistics */
outw_el3(dep, REG_CmdStatus, CMD_StatsEnable);
/* Enable transmitter and receiver */
outw_el3(dep, REG_CmdStatus, CMD_TxEnable);
outw_el3(dep, REG_CmdStatus, CMD_RxEnable);
/* Enable all the status bits */
outw_el3(dep, REG_CmdStatus, CMD_SetStatusEnab | 0xFF);
/* Acknowledge all interrupts to clear adapter. Enable interrupts */
outw_el3(dep, REG_CmdStatus, CMD_Acknowledge | 0xFF);
outw_el3(dep, REG_CmdStatus, CMD_SetIntMask |
(INT_Latch | INT_TxAvailable | INT_RxComplete | INT_UpdateStats));
/* Ready to operate, sets the environment for eth_task */
dep->de_data_port = dep->de_base_port;
/* Allocates Rx/Tx buffers */
init_buff(dep, NULL);
/* Device specific functions */
dep->de_recvf = el3_recv;
dep->de_sendf = el3_send;
dep->de_flagsf = el3_rx_mode;
dep->de_resetf = el3_reset;
dep->de_getstatsf = el3_getstats;
dep->de_dumpstatsf = el3_dodump;
dep->de_interruptf = el3_interrupt;
printf("%s: Etherlink III (%s) at %X:%d, %s port - ",
dep->de_name, "3c509", dep->de_base_port, dep->de_irq,
IfNamesMsg[dep->de_if_port >> 14]);
for (ix = 0; ix < SA_ADDR_LEN; ix += 1)
printf("%02X%c", dep->de_address.ea_addr[ix],
ix < SA_ADDR_LEN - 1 ? ':' : '\n');
return; /* Done */
}
/*
** Name: unsigned int el3_checksum(port_t port);
** Function: Reads EEPROM and computes checksum.
*/
static unsigned short el3_checksum(port_t port)
{
unsigned short rc, checksum, address;
unsigned char lo, hi;
for (checksum = address = 0; address < 15; address += 1) {
rc = el3_read_eeprom(port, address);
lo = rc & 0xFF;
hi = (rc >> 8) & 0xFF;
if ((address == EE_PROD_ID && (rc & EE_PROD_ID_MASK) != EL3_PRODUCT_ID) ||
(address == EE_3COM_CODE && rc != EL3_3COM_CODE))
return address;
if (address == EE_ADDR_CFG ||
address == EE_RESOURCE_CFG ||
address == EE_SW_CONFIG_INFO) {
lo ^= hi;
hi = 0;
} else {
hi ^= lo;
lo = 0;
}
rc = ((unsigned) hi << 8) + lo;
checksum ^= rc;
}
rc = el3_read_eeprom(port, address);
return(checksum ^= rc); /* If OK checksum is 0 */
}
/*
** Name: void el3_write_id(port_t port);
** Function: Writes the ID sequence to the board.
*/
static void el3_write_id(port_t port)
{
int ix, pattern;
outb(port, 0); /* Selects the ID port */
outb(port, 0); /* Resets hardware pattern generator */
for (pattern = ix = 0x00FF; ix > 0; ix -= 1) {
outb(port, pattern);
pattern <<= 1;
pattern = (pattern & 0x0100) ? pattern ^ 0xCF : pattern;
}
return;
}
/*
** Name: int el3_probe(dpeth_t *dep)
** Function: Checks for presence of the board.
*/
int el3_probe(dpeth_t * dep)
{
port_t id_port;
/* Don't ask me what is this for !! */
outb(0x0279, 0x02); /* Select PnP config control register. */
outb(0x0A79, 0x02); /* Return to WaitForKey state. */
/* Tests I/O ports in the 0x1xF range for a valid ID port */
for (id_port = 0x110; id_port < 0x200; id_port += 0x10) {
outb(id_port, 0x00);
outb(id_port, 0xFF);
if (inb(id_port) & 0x01) break;
}
if (id_port == 0x200) return 0; /* No board responding */
el3_write_id(id_port);
outb(id_port, EL3_ID_GLOBAL_RESET); /* Reset the board */
milli_delay(5); /* Technical reference says 162 micro sec. */
el3_write_id(id_port);
outb(id_port, EL3_SET_TAG_REGISTER);
milli_delay(5);
dep->de_id_port = id_port; /* Stores ID port No. */
dep->de_ramsize = /* RAM size is meaningless */
dep->de_offset_page = 0;
dep->de_linmem = 0L; /* Access is via I/O port */
/* Device specific functions */
dep->de_initf = el3_open;
dep->de_stopf = el3_close;
return(el3_checksum(id_port) == 0); /* Etherlink board found/not found */
}
#endif /* ENABLE_3C509 */
/** 3c509.c **/
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