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linux/drivers/net/3c507.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

966 lines
29 KiB
C
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/* 3c507.c: An EtherLink16 device driver for Linux. */
/*
Written 1993,1994 by Donald Becker.
Copyright 1993 United States Government as represented by the
Director, National Security Agency.
This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
The author may be reached as becker@scyld.com, or C/O
Scyld Computing Corporation
410 Severn Ave., Suite 210
Annapolis MD 21403
Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings)
and jrs@world.std.com (Rick Sladkey) for testing and bugfixes.
Mark Salazar <leslie@access.digex.net> made the changes for cards with
only 16K packet buffers.
Things remaining to do:
Verify that the tx and rx buffers don't have fencepost errors.
Move the theory of operation and memory map documentation.
The statistics need to be updated correctly.
*/
#define DRV_NAME "3c507"
#define DRV_VERSION "1.10a"
#define DRV_RELDATE "11/17/2001"
static const char version[] =
DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Donald Becker (becker@scyld.com)\n";
/*
Sources:
This driver wouldn't have been written with the availability of the
Crynwr driver source code. It provided a known-working implementation
that filled in the gaping holes of the Intel documentation. Three cheers
for Russ Nelson.
Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
info that the casual reader might think that it documents the i82586 :-<.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
/* use 0 for production, 1 for verification, 2..7 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 1
#endif
static unsigned int net_debug = NET_DEBUG;
#define debug net_debug
/*
Details of the i82586.
You'll really need the databook to understand the details of this part,
but the outline is that the i82586 has two separate processing units.
Both are started from a list of three configuration tables, of which only
the last, the System Control Block (SCB), is used after reset-time. The SCB
has the following fields:
Status word
Command word
Tx/Command block addr.
Rx block addr.
The command word accepts the following controls for the Tx and Rx units:
*/
#define CUC_START 0x0100
#define CUC_RESUME 0x0200
#define CUC_SUSPEND 0x0300
#define RX_START 0x0010
#define RX_RESUME 0x0020
#define RX_SUSPEND 0x0030
/* The Rx unit uses a list of frame descriptors and a list of data buffer
descriptors. We use full-sized (1518 byte) data buffers, so there is
a one-to-one pairing of frame descriptors to buffer descriptors.
The Tx ("command") unit executes a list of commands that look like:
Status word Written by the 82586 when the command is done.
Command word Command in lower 3 bits, post-command action in upper 3
Link word The address of the next command.
Parameters (as needed).
Some definitions related to the Command Word are:
*/
#define CMD_EOL 0x8000 /* The last command of the list, stop. */
#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
enum commands {
CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
/* Information that need to be kept for each board. */
struct net_local {
struct net_device_stats stats;
int last_restart;
ushort rx_head;
ushort rx_tail;
ushort tx_head;
ushort tx_cmd_link;
ushort tx_reap;
ushort tx_pkts_in_ring;
spinlock_t lock;
void __iomem *base;
};
/*
Details of the EtherLink16 Implementation
The 3c507 is a generic shared-memory i82586 implementation.
The host can map 16K, 32K, 48K, or 64K of the 64K memory into
0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
*/
/* Offsets from the base I/O address. */
#define SA_DATA 0 /* Station address data, or 3Com signature. */
#define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
#define RESET_IRQ 10 /* Reset the latched IRQ line. */
#define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
#define ROM_CONFIG 13
#define MEM_CONFIG 14
#define IRQ_CONFIG 15
#define EL16_IO_EXTENT 16
/* The ID port is used at boot-time to locate the ethercard. */
#define ID_PORT 0x100
/* Offsets to registers in the mailbox (SCB). */
#define iSCB_STATUS 0x8
#define iSCB_CMD 0xA
#define iSCB_CBL 0xC /* Command BLock offset. */
#define iSCB_RFA 0xE /* Rx Frame Area offset. */
/* Since the 3c507 maps the shared memory window so that the last byte is
at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
We can account for this be setting the 'SBC Base' entry in the ISCP table
below for all the 16 bit offset addresses, and also adding the 'SCB Base'
value to all 24 bit physical addresses (in the SCP table and the TX and RX
Buffer Descriptors).
-Mark
*/
#define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
/*
What follows in 'init_words[]' is the "program" that is downloaded to the
82586 memory. It's mostly tables and command blocks, and starts at the
reset address 0xfffff6. This is designed to be similar to the EtherExpress,
thus the unusual location of the SCB at 0x0008.
Even with the additional "don't care" values, doing it this way takes less
program space than initializing the individual tables, and I feel it's much
cleaner.
The databook is particularly useless for the first two structures, I had
to use the Crynwr driver as an example.
The memory setup is as follows:
*/
#define CONFIG_CMD 0x0018
#define SET_SA_CMD 0x0024
#define SA_OFFSET 0x002A
#define IDLELOOP 0x30
#define TDR_CMD 0x38
#define TDR_TIME 0x3C
#define DUMP_CMD 0x40
#define DIAG_CMD 0x48
#define SET_MC_CMD 0x4E
#define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
#define TX_BUF_START 0x0100
#define NUM_TX_BUFS 5
#define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
#define RX_BUF_START 0x2000
#define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
#define RX_BUF_END (dev->mem_end - dev->mem_start)
#define TX_TIMEOUT 5
/*
That's it: only 86 bytes to set up the beast, including every extra
command available. The 170 byte buffer at DUMP_DATA is shared between the
Dump command (called only by the diagnostic program) and the SetMulticastList
command.
To complete the memory setup you only have to write the station address at
SA_OFFSET and create the Tx & Rx buffer lists.
The Tx command chain and buffer list is setup as follows:
A Tx command table, with the data buffer pointing to...
A Tx data buffer descriptor. The packet is in a single buffer, rather than
chaining together several smaller buffers.
A NoOp command, which initially points to itself,
And the packet data.
A transmit is done by filling in the Tx command table and data buffer,
re-writing the NoOp command, and finally changing the offset of the last
command to point to the current Tx command. When the Tx command is finished,
it jumps to the NoOp, when it loops until the next Tx command changes the
"link offset" in the NoOp. This way the 82586 never has to go through the
slow restart sequence.
The Rx buffer list is set up in the obvious ring structure. We have enough
memory (and low enough interrupt latency) that we can avoid the complicated
Rx buffer linked lists by alway associating a full-size Rx data buffer with
each Rx data frame.
I current use four transmit buffers starting at TX_BUF_START (0x0100), and
use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
*/
static unsigned short init_words[] = {
/* System Configuration Pointer (SCP). */
0x0000, /* Set bus size to 16 bits. */
0,0, /* pad words. */
0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
/* Intermediate System Configuration Pointer (ISCP). */
0x0001, /* Status word that's cleared when init is done. */
0x0008,0,0, /* SCB offset, (skip, skip) */
/* System Control Block (SCB). */
0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
CONFIG_CMD, /* Command list pointer, points to Configure. */
RX_BUF_START, /* Rx block list. */
0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
/* 0x0018: Configure command. Change to put MAC data with packet. */
0, CmdConfigure, /* Status, command. */
SET_SA_CMD, /* Next command is Set Station Addr. */
0x0804, /* "4" bytes of config data, 8 byte FIFO. */
0x2e40, /* Magic values, including MAC data location. */
0, /* Unused pad word. */
/* 0x0024: Setup station address command. */
0, CmdSASetup,
SET_MC_CMD, /* Next command. */
0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
/* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
0, CmdNOp, IDLELOOP, 0 /* pad */,
/* 0x0038: A unused Time-Domain Reflectometer command. */
0, CmdTDR, IDLELOOP, 0,
/* 0x0040: An unused Dump State command. */
0, CmdDump, IDLELOOP, DUMP_DATA,
/* 0x0048: An unused Diagnose command. */
0, CmdDiagnose, IDLELOOP,
/* 0x004E: An empty set-multicast-list command. */
0, CmdMulticastList, IDLELOOP, 0,
};
/* Index to functions, as function prototypes. */
static int el16_probe1(struct net_device *dev, int ioaddr);
static int el16_open(struct net_device *dev);
static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t el16_interrupt(int irq, void *dev_id);
static void el16_rx(struct net_device *dev);
static int el16_close(struct net_device *dev);
static struct net_device_stats *el16_get_stats(struct net_device *dev);
static void el16_tx_timeout (struct net_device *dev);
static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
static void init_82586_mem(struct net_device *dev);
static const struct ethtool_ops netdev_ethtool_ops;
static void init_rx_bufs(struct net_device *);
static int io = 0x300;
static int irq;
static int mem_start;
/* Check for a network adaptor of this type, and return '0' iff one exists.
If dev->base_addr == 0, probe all likely locations.
If dev->base_addr == 1, always return failure.
If dev->base_addr == 2, (detachable devices only) allocate space for the
device and return success.
*/
struct net_device * __init el16_probe(int unit)
{
struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
unsigned *port;
int err = -ENODEV;
if (!dev)
return ERR_PTR(-ENODEV);
if (unit >= 0) {
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
io = dev->base_addr;
irq = dev->irq;
mem_start = dev->mem_start & 15;
}
SET_MODULE_OWNER(dev);
if (io > 0x1ff) /* Check a single specified location. */
err = el16_probe1(dev, io);
else if (io != 0)
err = -ENXIO; /* Don't probe at all. */
else {
for (port = ports; *port; port++) {
err = el16_probe1(dev, *port);
if (!err)
break;
}
}
if (err)
goto out;
err = register_netdev(dev);
if (err)
goto out1;
return dev;
out1:
free_irq(dev->irq, dev);
iounmap(((struct net_local *)netdev_priv(dev))->base);
release_region(dev->base_addr, EL16_IO_EXTENT);
out:
free_netdev(dev);
return ERR_PTR(err);
}
static int __init el16_probe1(struct net_device *dev, int ioaddr)
{
static unsigned char init_ID_done, version_printed;
int i, irq, irqval, retval;
struct net_local *lp;
if (init_ID_done == 0) {
ushort lrs_state = 0xff;
/* Send the ID sequence to the ID_PORT to enable the board(s). */
outb(0x00, ID_PORT);
for(i = 0; i < 255; i++) {
outb(lrs_state, ID_PORT);
lrs_state <<= 1;
if (lrs_state & 0x100)
lrs_state ^= 0xe7;
}
outb(0x00, ID_PORT);
init_ID_done = 1;
}
if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
return -ENODEV;
if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
(inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
retval = -ENODEV;
goto out;
}
if (net_debug && version_printed++ == 0)
printk(version);
printk("%s: 3c507 at %#x,", dev->name, ioaddr);
/* We should make a few more checks here, like the first three octets of
the S.A. for the manufacturer's code. */
irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
if (irqval) {
printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
retval = -EAGAIN;
goto out;
}
/* We've committed to using the board, and can start filling in *dev. */
dev->base_addr = ioaddr;
outb(0x01, ioaddr + MISC_CTRL);
for (i = 0; i < 6; i++) {
dev->dev_addr[i] = inb(ioaddr + i);
printk(" %02x", dev->dev_addr[i]);
}
if (mem_start)
net_debug = mem_start & 7;
#ifdef MEM_BASE
dev->mem_start = MEM_BASE;
dev->mem_end = dev->mem_start + 0x10000;
#else
{
int base;
int size;
char mem_config = inb(ioaddr + MEM_CONFIG);
if (mem_config & 0x20) {
size = 64*1024;
base = 0xf00000 + (mem_config & 0x08 ? 0x080000
: ((mem_config & 3) << 17));
} else {
size = ((mem_config & 3) + 1) << 14;
base = 0x0c0000 + ( (mem_config & 0x18) << 12);
}
dev->mem_start = base;
dev->mem_end = base + size;
}
#endif
dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
if (net_debug)
printk(version);
lp = netdev_priv(dev);
memset(lp, 0, sizeof(*lp));
spin_lock_init(&lp->lock);
lp->base = ioremap(dev->mem_start, RX_BUF_END);
if (!lp->base) {
printk(KERN_ERR "3c507: unable to remap memory\n");
retval = -EAGAIN;
goto out1;
}
dev->open = el16_open;
dev->stop = el16_close;
dev->hard_start_xmit = el16_send_packet;
dev->get_stats = el16_get_stats;
dev->tx_timeout = el16_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->ethtool_ops = &netdev_ethtool_ops;
dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
return 0;
out1:
free_irq(dev->irq, dev);
out:
release_region(ioaddr, EL16_IO_EXTENT);
return retval;
}
static int el16_open(struct net_device *dev)
{
/* Initialize the 82586 memory and start it. */
init_82586_mem(dev);
netif_start_queue(dev);
return 0;
}
static void el16_tx_timeout (struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
void __iomem *shmem = lp->base;
if (net_debug > 1)
printk ("%s: transmit timed out, %s? ", dev->name,
readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
"network cable problem");
/* Try to restart the adaptor. */
if (lp->last_restart == lp->stats.tx_packets) {
if (net_debug > 1)
printk ("Resetting board.\n");
/* Completely reset the adaptor. */
init_82586_mem (dev);
lp->tx_pkts_in_ring = 0;
} else {
/* Issue the channel attention signal and hope it "gets better". */
if (net_debug > 1)
printk ("Kicking board.\n");
writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
lp->last_restart = lp->stats.tx_packets;
}
dev->trans_start = jiffies;
netif_wake_queue (dev);
}
static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
unsigned long flags;
short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
unsigned char *buf = skb->data;
netif_stop_queue (dev);
spin_lock_irqsave (&lp->lock, flags);
lp->stats.tx_bytes += length;
/* Disable the 82586's input to the interrupt line. */
outb (0x80, ioaddr + MISC_CTRL);
hardware_send_packet (dev, buf, skb->len, length - skb->len);
dev->trans_start = jiffies;
/* Enable the 82586 interrupt input. */
outb (0x84, ioaddr + MISC_CTRL);
spin_unlock_irqrestore (&lp->lock, flags);
dev_kfree_skb (skb);
/* You might need to clean up and record Tx statistics here. */
return 0;
}
/* The typical workload of the driver:
Handle the network interface interrupts. */
static irqreturn_t el16_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct net_local *lp;
int ioaddr, status, boguscount = 0;
ushort ack_cmd = 0;
void __iomem *shmem;
if (dev == NULL) {
printk ("net_interrupt(): irq %d for unknown device.\n", irq);
return IRQ_NONE;
}
ioaddr = dev->base_addr;
lp = netdev_priv(dev);
shmem = lp->base;
spin_lock(&lp->lock);
status = readw(shmem+iSCB_STATUS);
if (net_debug > 4) {
printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
}
/* Disable the 82586's input to the interrupt line. */
outb(0x80, ioaddr + MISC_CTRL);
/* Reap the Tx packet buffers. */
while (lp->tx_pkts_in_ring) {
unsigned short tx_status = readw(shmem+lp->tx_reap);
if (!(tx_status & 0x8000)) {
if (net_debug > 5)
printk("Tx command incomplete (%#x).\n", lp->tx_reap);
break;
}
/* Tx unsuccessful or some interesting status bit set. */
if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
lp->stats.tx_errors++;
if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
lp->stats.collisions += tx_status & 0xf;
}
lp->stats.tx_packets++;
if (net_debug > 5)
printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
lp->tx_reap += TX_BUF_SIZE;
if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
lp->tx_reap = TX_BUF_START;
lp->tx_pkts_in_ring--;
/* There is always more space in the Tx ring buffer now. */
netif_wake_queue(dev);
if (++boguscount > 10)
break;
}
if (status & 0x4000) { /* Packet received. */
if (net_debug > 5)
printk("Received packet, rx_head %04x.\n", lp->rx_head);
el16_rx(dev);
}
/* Acknowledge the interrupt sources. */
ack_cmd = status & 0xf000;
if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
if (net_debug)
printk("%s: Command unit stopped, status %04x, restarting.\n",
dev->name, status);
/* If this ever occurs we should really re-write the idle loop, reset
the Tx list, and do a complete restart of the command unit.
For now we rely on the Tx timeout if the resume doesn't work. */
ack_cmd |= CUC_RESUME;
}
if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
/* The Rx unit is not ready, it must be hung. Restart the receiver by
initializing the rx buffers, and issuing an Rx start command. */
if (net_debug)
printk("%s: Rx unit stopped, status %04x, restarting.\n",
dev->name, status);
init_rx_bufs(dev);
writew(RX_BUF_START,shmem+iSCB_RFA);
ack_cmd |= RX_START;
}
writew(ack_cmd,shmem+iSCB_CMD);
outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
/* Clear the latched interrupt. */
outb(0, ioaddr + RESET_IRQ);
/* Enable the 82586's interrupt input. */
outb(0x84, ioaddr + MISC_CTRL);
spin_unlock(&lp->lock);
return IRQ_HANDLED;
}
static int el16_close(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
void __iomem *shmem = lp->base;
netif_stop_queue(dev);
/* Flush the Tx and disable Rx. */
writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
outb(0, ioaddr + SIGNAL_CA);
/* Disable the 82586's input to the interrupt line. */
outb(0x80, ioaddr + MISC_CTRL);
/* We always physically use the IRQ line, so we don't do free_irq(). */
/* Update the statistics here. */
return 0;
}
/* Get the current statistics. This may be called with the card open or
closed. */
static struct net_device_stats *el16_get_stats(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
/* ToDo: decide if there are any useful statistics from the SCB. */
return &lp->stats;
}
/* Initialize the Rx-block list. */
static void init_rx_bufs(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
void __iomem *write_ptr;
unsigned short SCB_base = SCB_BASE;
int cur_rxbuf = lp->rx_head = RX_BUF_START;
/* Initialize each Rx frame + data buffer. */
do { /* While there is room for one more. */
write_ptr = lp->base + cur_rxbuf;
writew(0x0000,write_ptr); /* Status */
writew(0x0000,write_ptr+=2); /* Command */
writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
writew(0x0000,write_ptr+=2);
writew(0x0000,write_ptr+=2);
writew(0x0000,write_ptr+=2); /* Pad for source addr. */
writew(0x0000,write_ptr+=2);
writew(0x0000,write_ptr+=2);
writew(0x0000,write_ptr+=2); /* Pad for protocol. */
writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
writew(-1,write_ptr+=2); /* Buffer: Next (none). */
writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
writew(0x0000,write_ptr+=2);
/* Finally, the number of bytes in the buffer. */
writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
lp->rx_tail = cur_rxbuf;
cur_rxbuf += RX_BUF_SIZE;
} while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
/* Terminate the list by setting the EOL bit, and wrap the pointer to make
the list a ring. */
write_ptr = lp->base + lp->rx_tail + 2;
writew(0xC000,write_ptr); /* Command, mark as last. */
writew(lp->rx_head,write_ptr+2); /* Link */
}
static void init_82586_mem(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
short ioaddr = dev->base_addr;
void __iomem *shmem = lp->base;
/* Enable loopback to protect the wire while starting up,
and hold the 586 in reset during the memory initialization. */
outb(0x20, ioaddr + MISC_CTRL);
/* Fix the ISCP address and base. */
init_words[3] = SCB_BASE;
init_words[7] = SCB_BASE;
/* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
/* Write the words at 0x0000. */
memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
/* Fill in the station address. */
memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
sizeof(dev->dev_addr));
/* The Tx-block list is written as needed. We just set up the values. */
lp->tx_cmd_link = IDLELOOP + 4;
lp->tx_head = lp->tx_reap = TX_BUF_START;
init_rx_bufs(dev);
/* Start the 586 by releasing the reset line, but leave loopback. */
outb(0xA0, ioaddr + MISC_CTRL);
/* This was time consuming to track down: you need to give two channel
attention signals to reliably start up the i82586. */
outb(0, ioaddr + SIGNAL_CA);
{
int boguscnt = 50;
while (readw(shmem+iSCB_STATUS) == 0)
if (--boguscnt == 0) {
printk("%s: i82586 initialization timed out with status %04x,"
"cmd %04x.\n", dev->name,
readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
break;
}
/* Issue channel-attn -- the 82586 won't start. */
outb(0, ioaddr + SIGNAL_CA);
}
/* Disable loopback and enable interrupts. */
outb(0x84, ioaddr + MISC_CTRL);
if (net_debug > 4)
printk("%s: Initialized 82586, status %04x.\n", dev->name,
readw(shmem+iSCB_STATUS));
return;
}
static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
{
struct net_local *lp = netdev_priv(dev);
short ioaddr = dev->base_addr;
ushort tx_block = lp->tx_head;
void __iomem *write_ptr = lp->base + tx_block;
static char padding[ETH_ZLEN];
/* Set the write pointer to the Tx block, and put out the header. */
writew(0x0000,write_ptr); /* Tx status */
writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
/* Output the data buffer descriptor. */
writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
writew(-1,write_ptr+=2); /* No next data buffer. */
writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
/* Output the Loop-back NoOp command. */
writew(0x0000,write_ptr+=2); /* Tx status */
writew(CmdNOp,write_ptr+=2); /* Tx command */
writew(tx_block+16,write_ptr+=2); /* Next is myself. */
/* Output the packet at the write pointer. */
memcpy_toio(write_ptr+2, buf, length);
if (pad)
memcpy_toio(write_ptr+length+2, padding, pad);
/* Set the old command link pointing to this send packet. */
writew(tx_block,lp->base + lp->tx_cmd_link);
lp->tx_cmd_link = tx_block + 20;
/* Set the next free tx region. */
lp->tx_head = tx_block + TX_BUF_SIZE;
if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
lp->tx_head = TX_BUF_START;
if (net_debug > 4) {
printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
dev->name, ioaddr, length, tx_block, lp->tx_head);
}
/* Grimly block further packets if there has been insufficient reaping. */
if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
netif_wake_queue(dev);
}
static void el16_rx(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
void __iomem *shmem = lp->base;
ushort rx_head = lp->rx_head;
ushort rx_tail = lp->rx_tail;
ushort boguscount = 10;
short frame_status;
while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
void __iomem *read_frame = lp->base + rx_head;
ushort rfd_cmd = readw(read_frame+2);
ushort next_rx_frame = readw(read_frame+4);
ushort data_buffer_addr = readw(read_frame+6);
void __iomem *data_frame = lp->base + data_buffer_addr;
ushort pkt_len = readw(data_frame);
if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
|| (pkt_len & 0xC000) != 0xC000) {
printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
"next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
pkt_len);
} else if ((frame_status & 0x2000) == 0) {
/* Frame Rxed, but with error. */
lp->stats.rx_errors++;
if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
if (frame_status & 0x0100) lp->stats.rx_over_errors++;
if (frame_status & 0x0080) lp->stats.rx_length_errors++;
} else {
/* Malloc up new buffer. */
struct sk_buff *skb;
pkt_len &= 0x3fff;
skb = dev_alloc_skb(pkt_len+2);
if (skb == NULL) {
printk("%s: Memory squeeze, dropping packet.\n", dev->name);
lp->stats.rx_dropped++;
break;
}
skb_reserve(skb,2);
skb->dev = dev;
/* 'skb->data' points to the start of sk_buff data area. */
memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb);
dev->last_rx = jiffies;
lp->stats.rx_packets++;
lp->stats.rx_bytes += pkt_len;
}
/* Clear the status word and set End-of-List on the rx frame. */
writew(0,read_frame);
writew(0xC000,read_frame+2);
/* Clear the end-of-list on the prev. RFD. */
writew(0x0000,lp->base + rx_tail + 2);
rx_tail = rx_head;
rx_head = next_rx_frame;
if (--boguscount == 0)
break;
}
lp->rx_head = rx_head;
lp->rx_tail = rx_tail;
}
static void netdev_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strcpy(info->driver, DRV_NAME);
strcpy(info->version, DRV_VERSION);
sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
}
static u32 netdev_get_msglevel(struct net_device *dev)
{
return debug;
}
static void netdev_set_msglevel(struct net_device *dev, u32 level)
{
debug = level;
}
static const struct ethtool_ops netdev_ethtool_ops = {
.get_drvinfo = netdev_get_drvinfo,
.get_msglevel = netdev_get_msglevel,
.set_msglevel = netdev_set_msglevel,
};
#ifdef MODULE
static struct net_device *dev_3c507;
module_param(io, int, 0);
module_param(irq, int, 0);
MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
MODULE_PARM_DESC(irq, "(ignored)");
int __init init_module(void)
{
if (io == 0)
printk("3c507: You should not use auto-probing with insmod!\n");
dev_3c507 = el16_probe(-1);
return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
}
void
cleanup_module(void)
{
struct net_device *dev = dev_3c507;
unregister_netdev(dev);
free_irq(dev->irq, dev);
iounmap(((struct net_local *)netdev_priv(dev))->base);
release_region(dev->base_addr, EL16_IO_EXTENT);
free_netdev(dev);
}
#endif /* MODULE */
MODULE_LICENSE("GPL");
/*
* Local variables:
* compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -I/usr/src/linux/drivers/net -Wall -Wstrict-prototypes -O6 -m486 -c 3c507.c"
* version-control: t
* kept-new-versions: 5
* tab-width: 4
* c-indent-level: 4
* End:
*/
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