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3c505.c
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/*
* Linux Ethernet device driver for the 3Com Etherlink Plus (3C505)
* By Craig Southeren, Juha Laiho and Philip Blundell
*
* 3c505.c This module implements an interface to the 3Com
* Etherlink Plus (3c505) Ethernet card. Linux device
* driver interface reverse engineered from the Linux 3C509
* device drivers. Some 3C505 information gleaned from
* the Crynwr packet driver. Still this driver would not
* be here without 3C505 technical reference provided by
* 3Com.
*
* $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $
*
* Authors: Linux 3c505 device driver by
* Craig Southeren, <[email protected]>
* Final debugging by
* Andrew Tridgell, <[email protected]>
* Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
* Juha Laiho, <[email protected]>
* Linux 3C509 driver by
* Donald Becker, <[email protected]>
* (Now at <[email protected]>)
* Crynwr packet driver by
* Krishnan Gopalan and Gregg Stefancik,
* Clemson University Engineering Computer Operations.
* Portions of the code have been adapted from the 3c505
* driver for NCSA Telnet by Bruce Orchard and later
* modified by Warren Van Houten and [email protected].
* 3C505 technical information provided by
* Terry Murphy, of 3Com Network Adapter Division
* Linux 1.3.0 changes by
* Alan Cox <[email protected]>
* More debugging, DMA support, currently maintained by
* Philip Blundell <[email protected]>
* Multicard/soft configurable dma channel/rev 2 hardware support
* by Christopher Collins <[email protected]>
* Ethtool support (jgarzik), 11/17/2001
*/
#define DRV_NAME "3c505"
#define DRV_VERSION "1.10a"
/* Theory of operation:
*
* The 3c505 is quite an intelligent board. All communication with it is done
* by means of Primary Command Blocks (PCBs); these are transferred using PIO
* through the command register. The card has 256k of on-board RAM, which is
* used to buffer received packets. It might seem at first that more buffers
* are better, but in fact this isn't true. From my tests, it seems that
* more than about 10 buffers are unnecessary, and there is a noticeable
* performance hit in having more active on the card. So the majority of the
* card's memory isn't, in fact, used. Sadly, the card only has one transmit
* buffer and, short of loading our own firmware into it (which is what some
* drivers resort to) there's nothing we can do about this.
*
* We keep up to 4 "receive packet" commands active on the board at a time.
* When a packet comes in, so long as there is a receive command active, the
* board will send us a "packet received" PCB and then add the data for that
* packet to the DMA queue. If a DMA transfer is not already in progress, we
* set one up to start uploading the data. We have to maintain a list of
* backlogged receive packets, because the card may decide to tell us about
* a newly-arrived packet at any time, and we may not be able to start a DMA
* transfer immediately (ie one may already be going on). We can't NAK the
* PCB, because then it would throw the packet away.
*
* Trying to send a PCB to the card at the wrong moment seems to have bad
* effects. If we send it a transmit PCB while a receive DMA is happening,
* it will just NAK the PCB and so we will have wasted our time. Worse, it
* sometimes seems to interrupt the transfer. The majority of the low-level
* code is protected by one huge semaphore -- "busy" -- which is set whenever
* it probably isn't safe to do anything to the card. The receive routine
* must gain a lock on "busy" before it can start a DMA transfer, and the
* transmit routine must gain a lock before it sends the first PCB to the card.
* The send_pcb() routine also has an internal semaphore to protect it against
* being re-entered (which would be disastrous) -- this is needed because
* several things can happen asynchronously (re-priming the receiver and
* asking the card for statistics, for example). send_pcb() will also refuse
* to talk to the card at all if a DMA upload is happening. The higher-level
* networking code will reschedule a later retry if some part of the driver
* is blocked. In practice, this doesn't seem to happen very often.
*/
/* This driver may now work with revision 2.x hardware, since all the read
* operations on the HCR have been removed (we now keep our own softcopy).
* But I don't have an old card to test it on.
*
* This has had the bad effect that the autoprobe routine is now a bit
* less friendly to other devices. However, it was never very good.
* before, so I doubt it will hurt anybody.
*/
/* The driver is a mess. I took Craig's and Juha's code, and hacked it firstly
* to make it more reliable, and secondly to add DMA mode. Many things could
* probably be done better; the concurrency protection is particularly awful.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include "3c505.h"
/*********************************************************
*
* define debug messages here as common strings to reduce space
*
*********************************************************/
#define filename __FILE__
#define timeout_msg "*** timeout at %s:%s (line %d) ***\n"
#define TIMEOUT_MSG(lineno) \
pr_notice(timeout_msg, filename, __func__, (lineno))
#define invalid_pcb_msg "*** invalid pcb length %d at %s:%s (line %d) ***\n"
#define INVALID_PCB_MSG(len) \
pr_notice(invalid_pcb_msg, (len), filename, __func__, __LINE__)
#define search_msg "%s: Looking for 3c505 adapter at address %#x..."
#define stilllooking_msg "still looking..."
#define found_msg "found.\n"
#define notfound_msg "not found (reason = %d)\n"
#define couldnot_msg "%s: 3c505 not found\n"
/*********************************************************
*
* various other debug stuff
*
*********************************************************/
#ifdef ELP_DEBUG
static int elp_debug = ELP_DEBUG;
#else
static int elp_debug;
#endif
#define debug elp_debug
/*
* 0 = no messages (well, some)
* 1 = messages when high level commands performed
* 2 = messages when low level commands performed
* 3 = messages when interrupts received
*/
/*****************************************************************
*
* List of I/O-addresses we try to auto-sense
* Last element MUST BE 0!
*****************************************************************/
static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
/* Dma Memory related stuff */
static unsigned long dma_mem_alloc(int size)
{
int order = get_order(size);
return __get_dma_pages(GFP_KERNEL, order);
}
/*****************************************************************
*
* Functions for I/O (note the inline !)
*
*****************************************************************/
static inline unsigned char inb_status(unsigned int base_addr)
{
return inb(base_addr + PORT_STATUS);
}
static inline int inb_command(unsigned int base_addr)
{
return inb(base_addr + PORT_COMMAND);
}
static inline void outb_control(unsigned char val, struct net_device *dev)
{
outb(val, dev->base_addr + PORT_CONTROL);
((elp_device *)(netdev_priv(dev)))->hcr_val = val;
}
#define HCR_VAL(x) (((elp_device *)(netdev_priv(x)))->hcr_val)
static inline void outb_command(unsigned char val, unsigned int base_addr)
{
outb(val, base_addr + PORT_COMMAND);
}
static inline unsigned int backlog_next(unsigned int n)
{
return (n + 1) % BACKLOG_SIZE;
}
/*****************************************************************
*
* useful functions for accessing the adapter
*
*****************************************************************/
/*
* use this routine when accessing the ASF bits as they are
* changed asynchronously by the adapter
*/
/* get adapter PCB status */
#define GET_ASF(addr) \
(get_status(addr)&ASF_PCB_MASK)
static inline int get_status(unsigned int base_addr)
{
unsigned long timeout = jiffies + 10*HZ/100;
register int stat1;
do {
stat1 = inb_status(base_addr);
} while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
if (time_after_eq(jiffies, timeout))
TIMEOUT_MSG(__LINE__);
return stat1;
}
static inline void set_hsf(struct net_device *dev, int hsf)
{
elp_device *adapter = netdev_priv(dev);
unsigned long flags;
spin_lock_irqsave(&adapter->lock, flags);
outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
spin_unlock_irqrestore(&adapter->lock, flags);
}
static bool start_receive(struct net_device *, pcb_struct *);
static inline void adapter_reset(struct net_device *dev)
{
unsigned long timeout;
elp_device *adapter = netdev_priv(dev);
unsigned char orig_hcr = adapter->hcr_val;
outb_control(0, dev);
if (inb_status(dev->base_addr) & ACRF) {
do {
inb_command(dev->base_addr);
timeout = jiffies + 2*HZ/100;
while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
} while (inb_status(dev->base_addr) & ACRF);
set_hsf(dev, HSF_PCB_NAK);
}
outb_control(adapter->hcr_val | ATTN | DIR, dev);
mdelay(10);
outb_control(adapter->hcr_val & ~ATTN, dev);
mdelay(10);
outb_control(adapter->hcr_val | FLSH, dev);
mdelay(10);
outb_control(adapter->hcr_val & ~FLSH, dev);
mdelay(10);
outb_control(orig_hcr, dev);
if (!start_receive(dev, &adapter->tx_pcb))
pr_err("%s: start receive command failed\n", dev->name);
}
/* Check to make sure that a DMA transfer hasn't timed out. This should
* never happen in theory, but seems to occur occasionally if the card gets
* prodded at the wrong time.
*/
static inline void check_3c505_dma(struct net_device *dev)
{
elp_device *adapter = netdev_priv(dev);
if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
unsigned long flags, f;
pr_err("%s: DMA %s timed out, %d bytes left\n", dev->name,
adapter->current_dma.direction ? "download" : "upload",
get_dma_residue(dev->dma));
spin_lock_irqsave(&adapter->lock, flags);
adapter->dmaing = 0;
adapter->busy = 0;
f=claim_dma_lock();
disable_dma(dev->dma);
release_dma_lock(f);
if (adapter->rx_active)
adapter->rx_active--;
outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
spin_unlock_irqrestore(&adapter->lock, flags);
}
}
/* Primitive functions used by send_pcb() */
static inline bool send_pcb_slow(unsigned int base_addr, unsigned char byte)
{
unsigned long timeout;
outb_command(byte, base_addr);
for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
if (inb_status(base_addr) & HCRE)
return false;
}
pr_warning("3c505: send_pcb_slow timed out\n");
return true;
}
static inline bool send_pcb_fast(unsigned int base_addr, unsigned char byte)
{
unsigned int timeout;
outb_command(byte, base_addr);
for (timeout = 0; timeout < 40000; timeout++) {
if (inb_status(base_addr) & HCRE)
return false;
}
pr_warning("3c505: send_pcb_fast timed out\n");
return true;
}
/* Check to see if the receiver needs restarting, and kick it if so */
static inline void prime_rx(struct net_device *dev)
{
elp_device *adapter = netdev_priv(dev);
while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
if (!start_receive(dev, &adapter->itx_pcb))
break;
}
}
/*****************************************************************
*
* send_pcb
* Send a PCB to the adapter.
*
* output byte to command reg --<--+
* wait until HCRE is non zero |
* loop until all bytes sent -->--+
* set HSF1 and HSF2 to 1
* output pcb length
* wait until ASF give ACK or NAK
* set HSF1 and HSF2 to 0
*
*****************************************************************/
/* This can be quite slow -- the adapter is allowed to take up to 40ms
* to respond to the initial interrupt.
*
* We run initially with interrupts turned on, but with a semaphore set
* so that nobody tries to re-enter this code. Once the first byte has
* gone through, we turn interrupts off and then send the others (the
* timeout is reduced to 500us).
*/
static bool send_pcb(struct net_device *dev, pcb_struct * pcb)
{
int i;
unsigned long timeout;
elp_device *adapter = netdev_priv(dev);
unsigned long flags;
check_3c505_dma(dev);
if (adapter->dmaing && adapter->current_dma.direction == 0)
return false;
/* Avoid contention */
if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
if (elp_debug >= 3) {
pr_debug("%s: send_pcb entered while threaded\n", dev->name);
}
return false;
}
/*
* load each byte into the command register and
* wait for the HCRE bit to indicate the adapter
* had read the byte
*/
set_hsf(dev, 0);
if (send_pcb_slow(dev->base_addr, pcb->command))
goto abort;
spin_lock_irqsave(&adapter->lock, flags);
if (send_pcb_fast(dev->base_addr, pcb->length))
goto sti_abort;
for (i = 0; i < pcb->length; i++) {
if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
goto sti_abort;
}
outb_control(adapter->hcr_val | 3, dev); /* signal end of PCB */
outb_command(2 + pcb->length, dev->base_addr);
/* now wait for the acknowledgement */
spin_unlock_irqrestore(&adapter->lock, flags);
for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
switch (GET_ASF(dev->base_addr)) {
case ASF_PCB_ACK:
adapter->send_pcb_semaphore = 0;
return true;
case ASF_PCB_NAK:
#ifdef ELP_DEBUG
pr_debug("%s: send_pcb got NAK\n", dev->name);
#endif
goto abort;
}
}
if (elp_debug >= 1)
pr_debug("%s: timeout waiting for PCB acknowledge (status %02x)\n",
dev->name, inb_status(dev->base_addr));
goto abort;
sti_abort:
spin_unlock_irqrestore(&adapter->lock, flags);
abort:
adapter->send_pcb_semaphore = 0;
return false;
}
/*****************************************************************
*
* receive_pcb
* Read a PCB from the adapter
*
* wait for ACRF to be non-zero ---<---+
* input a byte |
* if ASF1 and ASF2 were not both one |
* before byte was read, loop --->---+
* set HSF1 and HSF2 for ack
*
*****************************************************************/
static bool receive_pcb(struct net_device *dev, pcb_struct * pcb)
{
int i, j;
int total_length;
int stat;
unsigned long timeout;
unsigned long flags;
elp_device *adapter = netdev_priv(dev);
set_hsf(dev, 0);
/* get the command code */
timeout = jiffies + 2*HZ/100;
while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
if (time_after_eq(jiffies, timeout)) {
TIMEOUT_MSG(__LINE__);
return false;
}
pcb->command = inb_command(dev->base_addr);
/* read the data length */
timeout = jiffies + 3*HZ/100;
while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
if (time_after_eq(jiffies, timeout)) {
TIMEOUT_MSG(__LINE__);
pr_info("%s: status %02x\n", dev->name, stat);
return false;
}
pcb->length = inb_command(dev->base_addr);
if (pcb->length > MAX_PCB_DATA) {
INVALID_PCB_MSG(pcb->length);
adapter_reset(dev);
return false;
}
/* read the data */
spin_lock_irqsave(&adapter->lock, flags);
for (i = 0; i < MAX_PCB_DATA; i++) {
for (j = 0; j < 20000; j++) {
stat = get_status(dev->base_addr);
if (stat & ACRF)
break;
}
pcb->data.raw[i] = inb_command(dev->base_addr);
if ((stat & ASF_PCB_MASK) == ASF_PCB_END || j >= 20000)
break;
}
spin_unlock_irqrestore(&adapter->lock, flags);
if (i >= MAX_PCB_DATA) {
INVALID_PCB_MSG(i);
return false;
}
if (j >= 20000) {
TIMEOUT_MSG(__LINE__);
return false;
}
/* the last "data" byte was really the length! */
total_length = pcb->data.raw[i];
/* safety check total length vs data length */
if (total_length != (pcb->length + 2)) {
if (elp_debug >= 2)
pr_warning("%s: mangled PCB received\n", dev->name);
set_hsf(dev, HSF_PCB_NAK);
return false;
}
if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
if (test_and_set_bit(0, (void *) &adapter->busy)) {
if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
set_hsf(dev, HSF_PCB_NAK);
pr_warning("%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
pcb->command = 0;
return true;
} else {
pcb->command = 0xff;
}
}
}
set_hsf(dev, HSF_PCB_ACK);
return true;
}
/******************************************************
*
* queue a receive command on the adapter so we will get an
* interrupt when a packet is received.
*
******************************************************/
static bool start_receive(struct net_device *dev, pcb_struct * tx_pcb)
{
bool status;
elp_device *adapter = netdev_priv(dev);
if (elp_debug >= 3)
pr_debug("%s: restarting receiver\n", dev->name);
tx_pcb->command = CMD_RECEIVE_PACKET;
tx_pcb->length = sizeof(struct Rcv_pkt);
tx_pcb->data.rcv_pkt.buf_seg
= tx_pcb->data.rcv_pkt.buf_ofs = 0; /* Unused */
tx_pcb->data.rcv_pkt.buf_len = 1600;
tx_pcb->data.rcv_pkt.timeout = 0; /* set timeout to zero */
status = send_pcb(dev, tx_pcb);
if (status)
adapter->rx_active++;
return status;
}
/******************************************************
*
* extract a packet from the adapter
* this routine is only called from within the interrupt
* service routine, so no cli/sti calls are needed
* note that the length is always assumed to be even
*
******************************************************/
static void receive_packet(struct net_device *dev, int len)
{
int rlen;
elp_device *adapter = netdev_priv(dev);
void *target;
struct sk_buff *skb;
unsigned long flags;
rlen = (len + 1) & ~1;
skb = dev_alloc_skb(rlen + 2);
if (!skb) {
pr_warning("%s: memory squeeze, dropping packet\n", dev->name);
target = adapter->dma_buffer;
adapter->current_dma.target = NULL;
/* FIXME: stats */
return;
}
skb_reserve(skb, 2);
target = skb_put(skb, rlen);
if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
adapter->current_dma.target = target;
target = adapter->dma_buffer;
} else {
adapter->current_dma.target = NULL;
}
/* if this happens, we die */
if (test_and_set_bit(0, (void *) &adapter->dmaing))
pr_err("%s: rx blocked, DMA in progress, dir %d\n",
dev->name, adapter->current_dma.direction);
adapter->current_dma.direction = 0;
adapter->current_dma.length = rlen;
adapter->current_dma.skb = skb;
adapter->current_dma.start_time = jiffies;
outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
flags=claim_dma_lock();
disable_dma(dev->dma);
clear_dma_ff(dev->dma);
set_dma_mode(dev->dma, 0x04); /* dma read */
set_dma_addr(dev->dma, isa_virt_to_bus(target));
set_dma_count(dev->dma, rlen);
enable_dma(dev->dma);
release_dma_lock(flags);
if (elp_debug >= 3) {
pr_debug("%s: rx DMA transfer started\n", dev->name);
}
if (adapter->rx_active)
adapter->rx_active--;
if (!adapter->busy)
pr_warning("%s: receive_packet called, busy not set.\n", dev->name);
}
/******************************************************
*
* interrupt handler
*
******************************************************/
static irqreturn_t elp_interrupt(int irq, void *dev_id)
{
int len;
int dlen;
int icount = 0;
struct net_device *dev = dev_id;
elp_device *adapter = netdev_priv(dev);
unsigned long timeout;
spin_lock(&adapter->lock);
do {
/*
* has a DMA transfer finished?
*/
if (inb_status(dev->base_addr) & DONE) {
if (!adapter->dmaing)
pr_warning("%s: phantom DMA completed\n", dev->name);
if (elp_debug >= 3)
pr_debug("%s: %s DMA complete, status %02x\n", dev->name,
adapter->current_dma.direction ? "tx" : "rx",
inb_status(dev->base_addr));
outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
if (adapter->current_dma.direction) {
dev_kfree_skb_irq(adapter->current_dma.skb);
} else {
struct sk_buff *skb = adapter->current_dma.skb;
if (skb) {
if (adapter->current_dma.target) {
/* have already done the skb_put() */
memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
}
skb->protocol = eth_type_trans(skb,dev);
dev->stats.rx_bytes += skb->len;
netif_rx(skb);
}
}
adapter->dmaing = 0;
if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
if (elp_debug >= 2)
pr_debug("%s: receiving backlogged packet (%d)\n", dev->name, t);
receive_packet(dev, t);
} else {
adapter->busy = 0;
}
} else {
/* has one timed out? */
check_3c505_dma(dev);
}
/*
* receive a PCB from the adapter
*/
timeout = jiffies + 3*HZ/100;
while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
if (receive_pcb(dev, &adapter->irx_pcb)) {
switch (adapter->irx_pcb.command)
{
case 0:
break;
/*
* received a packet - this must be handled fast
*/
case 0xff:
case CMD_RECEIVE_PACKET_COMPLETE:
/* if the device isn't open, don't pass packets up the stack */
if (!netif_running(dev))
break;
len = adapter->irx_pcb.data.rcv_resp.pkt_len;
dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
pr_err("%s: interrupt - packet not received correctly\n", dev->name);
} else {
if (elp_debug >= 3) {
pr_debug("%s: interrupt - packet received of length %i (%i)\n",
dev->name, len, dlen);
}
if (adapter->irx_pcb.command == 0xff) {
if (elp_debug >= 2)
pr_debug("%s: adding packet to backlog (len = %d)\n",
dev->name, dlen);
adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
} else {
receive_packet(dev, dlen);
}
if (elp_debug >= 3)
pr_debug("%s: packet received\n", dev->name);
}
break;
/*
* 82586 configured correctly
*/
case CMD_CONFIGURE_82586_RESPONSE:
adapter->got[CMD_CONFIGURE_82586] = 1;
if (elp_debug >= 3)
pr_debug("%s: interrupt - configure response received\n", dev->name);
break;
/*
* Adapter memory configuration
*/
case CMD_CONFIGURE_ADAPTER_RESPONSE:
adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
if (elp_debug >= 3)
pr_debug("%s: Adapter memory configuration %s.\n", dev->name,
adapter->irx_pcb.data.failed ? "failed" : "succeeded");
break;
/*
* Multicast list loading
*/
case CMD_LOAD_MULTICAST_RESPONSE:
adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
if (elp_debug >= 3)
pr_debug("%s: Multicast address list loading %s.\n", dev->name,
adapter->irx_pcb.data.failed ? "failed" : "succeeded");
break;
/*
* Station address setting
*/
case CMD_SET_ADDRESS_RESPONSE:
adapter->got[CMD_SET_STATION_ADDRESS] = 1;
if (elp_debug >= 3)
pr_debug("%s: Ethernet address setting %s.\n", dev->name,
adapter->irx_pcb.data.failed ? "failed" : "succeeded");
break;
/*
* received board statistics
*/
case CMD_NETWORK_STATISTICS_RESPONSE:
dev->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
dev->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
dev->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
dev->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
dev->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
dev->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
adapter->got[CMD_NETWORK_STATISTICS] = 1;
if (elp_debug >= 3)
pr_debug("%s: interrupt - statistics response received\n", dev->name);
break;
/*
* sent a packet
*/
case CMD_TRANSMIT_PACKET_COMPLETE:
if (elp_debug >= 3)
pr_debug("%s: interrupt - packet sent\n", dev->name);
if (!netif_running(dev))
break;
switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
case 0xffff:
dev->stats.tx_aborted_errors++;
pr_info("%s: transmit timed out, network cable problem?\n", dev->name);
break;
case 0xfffe:
dev->stats.tx_fifo_errors++;
pr_info("%s: transmit timed out, FIFO underrun\n", dev->name);
break;
}
netif_wake_queue(dev);
break;
/*
* some unknown PCB
*/
default:
pr_debug("%s: unknown PCB received - %2.2x\n",
dev->name, adapter->irx_pcb.command);
break;
}
} else {
pr_warning("%s: failed to read PCB on interrupt\n", dev->name);
adapter_reset(dev);
}
}
} while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
prime_rx(dev);
/*
* indicate no longer in interrupt routine
*/
spin_unlock(&adapter->lock);
return IRQ_HANDLED;
}
/******************************************************
*
* open the board
*
******************************************************/
static int elp_open(struct net_device *dev)
{
elp_device *adapter = netdev_priv(dev);
int retval;
if (elp_debug >= 3)
pr_debug("%s: request to open device\n", dev->name);
/*
* make sure we actually found the device
*/
if (adapter == NULL) {
pr_err("%s: Opening a non-existent physical device\n", dev->name);
return -EAGAIN;
}
/*
* disable interrupts on the board
*/
outb_control(0, dev);
/*
* clear any pending interrupts
*/
inb_command(dev->base_addr);
adapter_reset(dev);
/*
* no receive PCBs active
*/
adapter->rx_active = 0;
adapter->busy = 0;
adapter->send_pcb_semaphore = 0;
adapter->rx_backlog.in = 0;
adapter->rx_backlog.out = 0;
spin_lock_init(&adapter->lock);
/*
* install our interrupt service routine
*/
if ((retval = request_irq(dev->irq, elp_interrupt, 0, dev->name, dev))) {
pr_err("%s: could not allocate IRQ%d\n", dev->name, dev->irq);
return retval;
}
if ((retval = request_dma(dev->dma, dev->name))) {
free_irq(dev->irq, dev);
pr_err("%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
return retval;
}
adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
if (!adapter->dma_buffer) {
pr_err("%s: could not allocate DMA buffer\n", dev->name);
free_dma(dev->dma);
free_irq(dev->irq, dev);
return -ENOMEM;
}
adapter->dmaing = 0;
/*
* enable interrupts on the board
*/
outb_control(CMDE, dev);
/*
* configure adapter memory: we need 10 multicast addresses, default==0
*/
if (elp_debug >= 3)
pr_debug("%s: sending 3c505 memory configuration command\n", dev->name);
adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
adapter->tx_pcb.data.memconf.cmd_q = 10;
adapter->tx_pcb.data.memconf.rcv_q = 20;
adapter->tx_pcb.data.memconf.mcast = 10;
adapter->tx_pcb.data.memconf.frame = 20;
adapter->tx_pcb.data.memconf.rcv_b = 20;
adapter->tx_pcb.data.memconf.progs = 0;
adapter->tx_pcb.length = sizeof(struct Memconf);
adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
if (!send_pcb(dev, &adapter->tx_pcb))
pr_err("%s: couldn't send memory configuration command\n", dev->name);
else {
unsigned long timeout = jiffies + TIMEOUT;
while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
if (time_after_eq(jiffies, timeout))
TIMEOUT_MSG(__LINE__);
}
/*
* configure adapter to receive broadcast messages and wait for response
*/
if (elp_debug >= 3)
pr_debug("%s: sending 82586 configure command\n", dev->name);
adapter->tx_pcb.command = CMD_CONFIGURE_82586;
adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
adapter->tx_pcb.length = 2;
adapter->got[CMD_CONFIGURE_82586] = 0;
if (!send_pcb(dev, &adapter->tx_pcb))
pr_err("%s: couldn't send 82586 configure command\n", dev->name);
else {
unsigned long timeout = jiffies + TIMEOUT;
while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
if (time_after_eq(jiffies, timeout))
TIMEOUT_MSG(__LINE__);
}
/* enable burst-mode DMA */
/* outb(0x1, dev->base_addr + PORT_AUXDMA); */
/*
* queue receive commands to provide buffering
*/
prime_rx(dev);
if (elp_debug >= 3)
pr_debug("%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
/*
* device is now officially open!
*/
netif_start_queue(dev);
return 0;
}
/******************************************************
*
* send a packet to the adapter
*
******************************************************/
static netdev_tx_t send_packet(struct net_device *dev, struct sk_buff *skb)
{
elp_device *adapter = netdev_priv(dev);
unsigned long target;
unsigned long flags;
/*
* make sure the length is even and no shorter than 60 bytes
*/
unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
if (test_and_set_bit(0, (void *) &adapter->busy)) {
if (elp_debug >= 2)
pr_debug("%s: transmit blocked\n", dev->name);
return false;
}
dev->stats.tx_bytes += nlen;
/*
* send the adapter a transmit packet command. Ignore segment and offset
* and make sure the length is even