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linux/drivers/net/de620.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

1048 lines
28 KiB
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/*
* de620.c $Revision: 1.40 $ BETA
*
*
* Linux driver for the D-Link DE-620 Ethernet pocket adapter.
*
* Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se>
*
* Based on adapter information gathered from DOS packetdriver
* sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.)
* Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992
* Copyright, 1988, Russell Nelson, Crynwr Software
*
* Adapted to the sample network driver core for linux,
* written by: Donald Becker <becker@super.org>
* (Now at <becker@scyld.com>)
*
* Valuable assistance from:
* J. Joshua Kopper <kopper@rtsg.mot.com>
* Olav Kvittem <Olav.Kvittem@uninett.no>
* Germano Caronni <caronni@nessie.cs.id.ethz.ch>
* Jeremy Fitzhardinge <jeremy@suite.sw.oz.au>
*
*****************************************************************************/
/*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
static const char version[] =
"de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n";
/***********************************************************************
*
* "Tuning" section.
*
* Compile-time options: (see below for descriptions)
* -DDE620_IO=0x378 (lpt1)
* -DDE620_IRQ=7 (lpt1)
* -DDE602_DEBUG=...
* -DSHUTDOWN_WHEN_LOST
* -DCOUNT_LOOPS
* -DLOWSPEED
* -DREAD_DELAY
* -DWRITE_DELAY
*/
/*
* This driver assumes that the printer port is a "normal",
* dumb, uni-directional port!
* If your port is "fancy" in any way, please try to set it to "normal"
* with your BIOS setup. I have no access to machines with bi-directional
* ports, so I can't test such a driver :-(
* (Yes, I _know_ it is possible to use DE620 with bidirectional ports...)
*
* There are some clones of DE620 out there, with different names.
* If the current driver does not recognize a clone, try to change
* the following #define to:
*
* #define DE620_CLONE 1
*/
#define DE620_CLONE 0
/*
* If the adapter has problems with high speeds, enable this #define
* otherwise full printerport speed will be attempted.
*
* You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED
*
#define LOWSPEED
*/
#ifndef READ_DELAY
#define READ_DELAY 100 /* adapter internal read delay in 100ns units */
#endif
#ifndef WRITE_DELAY
#define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */
#endif
/*
* Enable this #define if you want the adapter to do a "ifconfig down" on
* itself when we have detected that something is possibly wrong with it.
* The default behaviour is to retry with "adapter_init()" until success.
* This should be used for debugging purposes only.
*
#define SHUTDOWN_WHEN_LOST
*/
/*
* Enable debugging by "-DDE620_DEBUG=3" when compiling,
* OR by enabling the following #define
*
* use 0 for production, 1 for verification, >2 for debug
*
#define DE620_DEBUG 3
*/
#ifdef LOWSPEED
/*
* Enable this #define if you want to see debugging output that show how long
* we have to wait before the DE-620 is ready for the next read/write/command.
*
#define COUNT_LOOPS
*/
#endif
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include <asm/system.h>
/* Constant definitions for the DE-620 registers, commands and bits */
#include "de620.h"
typedef unsigned char byte;
/*******************************************************
* *
* Definition of D-Link DE-620 Ethernet Pocket adapter *
* See also "de620.h" *
* *
*******************************************************/
#ifndef DE620_IO /* Compile-time configurable */
#define DE620_IO 0x378
#endif
#ifndef DE620_IRQ /* Compile-time configurable */
#define DE620_IRQ 7
#endif
#define DATA_PORT (dev->base_addr)
#define STATUS_PORT (dev->base_addr + 1)
#define COMMAND_PORT (dev->base_addr + 2)
#define RUNT 60 /* Too small Ethernet packet */
#define GIANT 1514 /* largest legal size packet, no fcs */
#ifdef DE620_DEBUG /* Compile-time configurable */
#define PRINTK(x) if (de620_debug >= 2) printk x
#else
#define DE620_DEBUG 0
#define PRINTK(x) /**/
#endif
/*
* Force media with insmod:
* insmod de620.o bnc=1
* or
* insmod de620.o utp=1
*
* Force io and/or irq with insmod:
* insmod de620.o io=0x378 irq=7
*
* Make a clone skip the Ethernet-address range check:
* insmod de620.o clone=1
*/
static int bnc;
static int utp;
static int io = DE620_IO;
static int irq = DE620_IRQ;
static int clone = DE620_CLONE;
static unsigned int de620_debug = DE620_DEBUG;
static spinlock_t de620_lock;
module_param(bnc, int, 0);
module_param(utp, int, 0);
module_param(io, int, 0);
module_param(irq, int, 0);
module_param(clone, int, 0);
module_param(de620_debug, int, 0);
MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)");
MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)");
MODULE_PARM_DESC(io, "DE-620 I/O base address,required");
MODULE_PARM_DESC(irq, "DE-620 IRQ number,required");
MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)");
MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)");
/***********************************************
* *
* Index to functions, as function prototypes. *
* *
***********************************************/
/*
* Routines used internally. (See also "convenience macros.. below")
*/
/* Put in the device structure. */
static int de620_open(struct net_device *);
static int de620_close(struct net_device *);
static struct net_device_stats *get_stats(struct net_device *);
static void de620_set_multicast_list(struct net_device *);
static int de620_start_xmit(struct sk_buff *, struct net_device *);
/* Dispatch from interrupts. */
static irqreturn_t de620_interrupt(int, void *);
static int de620_rx_intr(struct net_device *);
/* Initialization */
static int adapter_init(struct net_device *);
static int read_eeprom(struct net_device *);
/*
* D-Link driver variables:
*/
#define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX
#define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */
#define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */
#define DEF_NIC_CMD IRQEN | ICEN | DS1
static volatile byte NIC_Cmd;
static volatile byte next_rx_page;
static byte first_rx_page;
static byte last_rx_page;
static byte EIPRegister;
static struct nic {
byte NodeID[6];
byte RAM_Size;
byte Model;
byte Media;
byte SCR;
} nic_data;
/**********************************************************
* *
* Convenience macros/functions for D-Link DE-620 adapter *
* *
**********************************************************/
#define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1))
#define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT);
/* Check for ready-status, and return a nibble (high 4 bits) for data input */
#ifdef COUNT_LOOPS
static int tot_cnt;
#endif
static inline byte
de620_ready(struct net_device *dev)
{
byte value;
register short int cnt = 0;
while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000))
++cnt;
#ifdef COUNT_LOOPS
tot_cnt += cnt;
#endif
return value & 0xf0; /* nibble */
}
static inline void
de620_send_command(struct net_device *dev, byte cmd)
{
de620_ready(dev);
if (cmd == W_DUMMY)
outb(NIC_Cmd, COMMAND_PORT);
outb(cmd, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_ready(dev);
outb(NIC_Cmd, COMMAND_PORT);
}
static inline void
de620_put_byte(struct net_device *dev, byte value)
{
/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
de620_ready(dev);
outb(value, DATA_PORT);
de620_flip_ds(dev);
}
static inline byte
de620_read_byte(struct net_device *dev)
{
byte value;
/* The de620_ready() makes 7 loops, on the average, on a DX2/66 */
value = de620_ready(dev); /* High nibble */
de620_flip_ds(dev);
value |= de620_ready(dev) >> 4; /* Low nibble */
return value;
}
static inline void
de620_write_block(struct net_device *dev, byte *buffer, int count, int pad)
{
#ifndef LOWSPEED
byte uflip = NIC_Cmd ^ (DS0 | DS1);
byte dflip = NIC_Cmd;
#else /* LOWSPEED */
#ifdef COUNT_LOOPS
int bytes = count;
#endif /* COUNT_LOOPS */
#endif /* LOWSPEED */
#ifdef LOWSPEED
#ifdef COUNT_LOOPS
tot_cnt = 0;
#endif /* COUNT_LOOPS */
/* No further optimization useful, the limit is in the adapter. */
for ( ; count > 0; --count, ++buffer) {
de620_put_byte(dev,*buffer);
}
for ( count = pad ; count > 0; --count, ++buffer) {
de620_put_byte(dev, 0);
}
de620_send_command(dev,W_DUMMY);
#ifdef COUNT_LOOPS
/* trial debug output: loops per byte in de620_ready() */
printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1)));
#endif /* COUNT_LOOPS */
#else /* not LOWSPEED */
for ( ; count > 0; count -=2) {
outb(*buffer++, DATA_PORT);
outb(uflip, COMMAND_PORT);
outb(*buffer++, DATA_PORT);
outb(dflip, COMMAND_PORT);
}
de620_send_command(dev,W_DUMMY);
#endif /* LOWSPEED */
}
static inline void
de620_read_block(struct net_device *dev, byte *data, int count)
{
#ifndef LOWSPEED
byte value;
byte uflip = NIC_Cmd ^ (DS0 | DS1);
byte dflip = NIC_Cmd;
#else /* LOWSPEED */
#ifdef COUNT_LOOPS
int bytes = count;
tot_cnt = 0;
#endif /* COUNT_LOOPS */
#endif /* LOWSPEED */
#ifdef LOWSPEED
/* No further optimization useful, the limit is in the adapter. */
while (count-- > 0) {
*data++ = de620_read_byte(dev);
de620_flip_ds(dev);
}
#ifdef COUNT_LOOPS
/* trial debug output: loops per byte in de620_ready() */
printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1)));
#endif /* COUNT_LOOPS */
#else /* not LOWSPEED */
while (count-- > 0) {
value = inb(STATUS_PORT) & 0xf0; /* High nibble */
outb(uflip, COMMAND_PORT);
*data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */
outb(dflip , COMMAND_PORT);
}
#endif /* LOWSPEED */
}
static inline void
de620_set_delay(struct net_device *dev)
{
de620_ready(dev);
outb(W_DFR, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_ready(dev);
#ifdef LOWSPEED
outb(WRITE_DELAY, DATA_PORT);
#else
outb(0, DATA_PORT);
#endif
de620_flip_ds(dev);
de620_ready(dev);
#ifdef LOWSPEED
outb(READ_DELAY, DATA_PORT);
#else
outb(0, DATA_PORT);
#endif
de620_flip_ds(dev);
}
static inline void
de620_set_register(struct net_device *dev, byte reg, byte value)
{
de620_ready(dev);
outb(reg, DATA_PORT);
outb(NIC_Cmd ^ CS0, COMMAND_PORT);
de620_put_byte(dev, value);
}
static inline byte
de620_get_register(struct net_device *dev, byte reg)
{
byte value;
de620_send_command(dev,reg);
value = de620_read_byte(dev);
de620_send_command(dev,W_DUMMY);
return value;
}
/*********************************************************************
*
* Open/initialize the board.
*
* This routine should set everything up anew at each open, even
* registers that "should" only need to be set once at boot, so that
* there is a non-reboot way to recover if something goes wrong.
*
*/
static int de620_open(struct net_device *dev)
{
int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev);
if (ret) {
printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq);
return ret;
}
if (adapter_init(dev)) {
ret = -EIO;
goto out_free_irq;
}
netif_start_queue(dev);
return 0;
out_free_irq:
free_irq(dev->irq, dev);
return ret;
}
/************************************************
*
* The inverse routine to de620_open().
*
*/
static int de620_close(struct net_device *dev)
{
netif_stop_queue(dev);
/* disable recv */
de620_set_register(dev, W_TCR, RXOFF);
free_irq(dev->irq, dev);
return 0;
}
/*********************************************
*
* Return current statistics
*
*/
static struct net_device_stats *get_stats(struct net_device *dev)
{
return (struct net_device_stats *)(dev->priv);
}
/*********************************************
*
* Set or clear the multicast filter for this adaptor.
* (no real multicast implemented for the DE-620, but she can be promiscuous...)
*
*/
static void de620_set_multicast_list(struct net_device *dev)
{
if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC))
{ /* Enable promiscuous mode */
/*
* We must make the kernel realise we had to move
* into promisc mode or we start all out war on
* the cable. - AC
*/
dev->flags|=IFF_PROMISC;
de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL);
}
else
{ /* Disable promiscuous mode, use normal mode */
de620_set_register(dev, W_TCR, TCR_DEF);
}
}
/*******************************************************
*
* Handle timeouts on transmit
*/
static void de620_timeout(struct net_device *dev)
{
printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem");
/* Restart the adapter. */
if (!adapter_init(dev)) /* maybe close it */
netif_wake_queue(dev);
}
/*******************************************************
*
* Copy a buffer to the adapter transmit page memory.
* Start sending.
*/
static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned long flags;
int len;
byte *buffer = skb->data;
byte using_txbuf;
using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */
netif_stop_queue(dev);
if ((len = skb->len) < RUNT)
len = RUNT;
if (len & 1) /* send an even number of bytes */
++len;
/* Start real output */
spin_lock_irqsave(&de620_lock, flags)
PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n",
(int)skb->len, using_txbuf));
/* select a free tx buffer. if there is one... */
switch (using_txbuf) {
default: /* both are free: use TXBF0 */
case TXBF1: /* use TXBF0 */
de620_send_command(dev,W_CR | RW0);
using_txbuf |= TXBF0;
break;
case TXBF0: /* use TXBF1 */
de620_send_command(dev,W_CR | RW1);
using_txbuf |= TXBF1;
break;
case (TXBF0 | TXBF1): /* NONE!!! */
printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name);
spin_unlock_irqrestore(&de620_lock, flags);
return 1;
}
de620_write_block(dev, buffer, skb->len, len-skb->len);
dev->trans_start = jiffies;
if(!(using_txbuf == (TXBF0 | TXBF1)))
netif_wake_queue(dev);
((struct net_device_stats *)(dev->priv))->tx_packets++;
spin_unlock_irqrestore(&de620_lock, flags);
dev_kfree_skb (skb);
return 0;
}
/*****************************************************
*
* Handle the network interface interrupts.
*
*/
static irqreturn_t
de620_interrupt(int irq_in, void *dev_id)
{
struct net_device *dev = dev_id;
byte irq_status;
int bogus_count = 0;
int again = 0;
spin_lock(&de620_lock);
/* Read the status register (_not_ the status port) */
irq_status = de620_get_register(dev, R_STS);
PRINTK(("de620_interrupt (%2.2X)\n", irq_status));
if (irq_status & RXGOOD) {
do {
again = de620_rx_intr(dev);
PRINTK(("again=%d\n", again));
}
while (again && (++bogus_count < 100));
}
if(de620_tx_buffs(dev) != (TXBF0 | TXBF1))
netif_wake_queue(dev);
spin_unlock(&de620_lock);
return IRQ_HANDLED;
}
/**************************************
*
* Get a packet from the adapter
*
* Send it "upstairs"
*
*/
static int de620_rx_intr(struct net_device *dev)
{
struct header_buf {
byte status;
byte Rx_NextPage;
unsigned short Rx_ByteCount;
} header_buf;
struct sk_buff *skb;
int size;
byte *buffer;
byte pagelink;
byte curr_page;
PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page));
/* Tell the adapter that we are going to read data, and from where */
de620_send_command(dev, W_CR | RRN);
de620_set_register(dev, W_RSA1, next_rx_page);
de620_set_register(dev, W_RSA0, 0);
/* Deep breath, and away we goooooo */
de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf));
PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n",
header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount));
/* Plausible page header? */
pagelink = header_buf.Rx_NextPage;
if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) {
/* Ouch... Forget it! Skip all and start afresh... */
printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name);
/* You win some, you lose some. And sometimes plenty... */
adapter_init(dev);
netif_wake_queue(dev);
((struct net_device_stats *)(dev->priv))->rx_over_errors++;
return 0;
}
/* OK, this look good, so far. Let's see if it's consistent... */
/* Let's compute the start of the next packet, based on where we are */
pagelink = next_rx_page +
((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8);
/* Are we going to wrap around the page counter? */
if (pagelink > last_rx_page)
pagelink -= (last_rx_page - first_rx_page + 1);
/* Is the _computed_ next page number equal to what the adapter says? */
if (pagelink != header_buf.Rx_NextPage) {
/* Naah, we'll skip this packet. Probably bogus data as well */
printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name);
next_rx_page = header_buf.Rx_NextPage; /* at least a try... */
de620_send_command(dev, W_DUMMY);
de620_set_register(dev, W_NPRF, next_rx_page);
((struct net_device_stats *)(dev->priv))->rx_over_errors++;
return 0;
}
next_rx_page = pagelink;
size = header_buf.Rx_ByteCount - 4;
if ((size < RUNT) || (GIANT < size)) {
printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size);
}
else { /* Good packet? */
skb = dev_alloc_skb(size+2);
if (skb == NULL) { /* Yeah, but no place to put it... */
printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
((struct net_device_stats *)(dev->priv))->rx_dropped++;
}
else { /* Yep! Go get it! */
skb_reserve(skb,2); /* Align */
skb->dev = dev;
/* skb->data points to the start of sk_buff data area */
buffer = skb_put(skb,size);
/* copy the packet into the buffer */
de620_read_block(dev, buffer, size);
PRINTK(("Read %d bytes\n", size));
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb); /* deliver it "upstairs" */
dev->last_rx = jiffies;
/* count all receives */
((struct net_device_stats *)(dev->priv))->rx_packets++;
((struct net_device_stats *)(dev->priv))->rx_bytes += size;
}
}
/* Let's peek ahead to see if we have read the last current packet */
/* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */
curr_page = de620_get_register(dev, R_CPR);
de620_set_register(dev, W_NPRF, next_rx_page);
PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page));
return (next_rx_page != curr_page); /* That was slightly tricky... */
}
/*********************************************
*
* Reset the adapter to a known state
*
*/
static int adapter_init(struct net_device *dev)
{
int i;
static int was_down;
if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */
EIPRegister = NCTL0;
if (nic_data.Media != 1)
EIPRegister |= NIS0; /* not BNC */
}
else if (nic_data.Model == 2) { /* UTP */
EIPRegister = NCTL0 | NIS0;
}
if (utp)
EIPRegister = NCTL0 | NIS0;
if (bnc)
EIPRegister = NCTL0;
de620_send_command(dev, W_CR | RNOP | CLEAR);
de620_send_command(dev, W_CR | RNOP);
de620_set_register(dev, W_SCR, SCR_DEF);
/* disable recv to wait init */
de620_set_register(dev, W_TCR, RXOFF);
/* Set the node ID in the adapter */
for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */
de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]);
}
de620_set_register(dev, W_EIP, EIPRegister);
next_rx_page = first_rx_page = DE620_RX_START_PAGE;
if (nic_data.RAM_Size)
last_rx_page = nic_data.RAM_Size - 1;
else /* 64k RAM */
last_rx_page = 255;
de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/
de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */
de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/
de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/
de620_send_command(dev, W_DUMMY);
de620_set_delay(dev);
/* Final sanity check: Anybody out there? */
/* Let's hope some bits from the statusregister make a good check */
#define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 )
#define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 )
/* success: X 0 0 X 0 0 X X */
/* ignore: EEDI RXGOOD COLS LNKS*/
if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) {
printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it"
#ifdef SHUTDOWN_WHEN_LOST
" and do a new ifconfig"
#endif
"! (%02x)\n", dev->name, i);
#ifdef SHUTDOWN_WHEN_LOST
/* Goodbye, cruel world... */
dev->flags &= ~IFF_UP;
de620_close(dev);
#endif
was_down = 1;
return 1; /* failed */
}
if (was_down) {
printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name);
was_down = 0;
}
/* All OK, go ahead... */
de620_set_register(dev, W_TCR, TCR_DEF);
return 0; /* all ok */
}
/******************************************************************************
*
* Only start-up code below
*
*/
/****************************************
*
* Check if there is a DE-620 connected
*/
struct net_device * __init de620_probe(int unit)
{
byte checkbyte = 0xa5;
struct net_device *dev;
int err = -ENOMEM;
int i;
dev = alloc_etherdev(sizeof(struct net_device_stats));
if (!dev)
goto out;
SET_MODULE_OWNER(dev);
spin_lock_init(&de620_lock);
/*
* This is where the base_addr and irq gets set.
* Tunable at compile-time and insmod-time
*/
dev->base_addr = io;
dev->irq = irq;
/* allow overriding parameters on command line */
if (unit >= 0) {
sprintf(dev->name, "eth%d", unit);
netdev_boot_setup_check(dev);
}
if (de620_debug)
printk(version);
printk(KERN_INFO "D-Link DE-620 pocket adapter");
if (!request_region(dev->base_addr, 3, "de620")) {
printk(" io 0x%3lX, which is busy.\n", dev->base_addr);
err = -EBUSY;
goto out1;
}
/* Initially, configure basic nibble mode, so we can read the EEPROM */
NIC_Cmd = DEF_NIC_CMD;
de620_set_register(dev, W_EIP, EIPRegister);
/* Anybody out there? */
de620_set_register(dev, W_CPR, checkbyte);
checkbyte = de620_get_register(dev, R_CPR);
if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) {
printk(" not identified in the printer port\n");
err = -ENODEV;
goto out2;
}
/* else, got it! */
printk(", Ethernet Address: %2.2X",
dev->dev_addr[0] = nic_data.NodeID[0]);
for (i = 1; i < ETH_ALEN; i++) {
printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]);
dev->broadcast[i] = 0xff;
}
printk(" (%dk RAM,",
(nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64);
if (nic_data.Media == 1)
printk(" BNC)\n");
else
printk(" UTP)\n");
dev->get_stats = get_stats;
dev->open = de620_open;
dev->stop = de620_close;
dev->hard_start_xmit = de620_start_xmit;
dev->tx_timeout = de620_timeout;
dev->watchdog_timeo = HZ*2;
dev->set_multicast_list = de620_set_multicast_list;
/* base_addr and irq are already set, see above! */
/* dump eeprom */
if (de620_debug) {
printk("\nEEPROM contents:\n");
printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size);
printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n",
nic_data.NodeID[0], nic_data.NodeID[1],
nic_data.NodeID[2], nic_data.NodeID[3],
nic_data.NodeID[4], nic_data.NodeID[5]);
printk("Model = %d\n", nic_data.Model);
printk("Media = %d\n", nic_data.Media);
printk("SCR = 0x%02x\n", nic_data.SCR);
}
err = register_netdev(dev);
if (err)
goto out2;
return dev;
out2:
release_region(dev->base_addr, 3);
out1:
free_netdev(dev);
out:
return ERR_PTR(err);
}
/**********************************
*
* Read info from on-board EEPROM
*
* Note: Bitwise serial I/O to/from the EEPROM vi the status _register_!
*/
#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister);
static unsigned short __init ReadAWord(struct net_device *dev, int from)
{
unsigned short data;
int nbits;
/* cs [__~~] SET SEND STATE */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4);
/* Send the 9-bit address from where we want to read the 16-bit word */
for (nbits = 9; nbits > 0; --nbits, from <<= 1) {
if (from & 0x0100) { /* bit set? */
/* cs [~~~~] SEND 1 */
/* di [~~~~] */
/* sck [_~~_] */
sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6);
}
else {
/* cs [~~~~] SEND 0 */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
}
}
/* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */
for (data = 0, nbits = 16; nbits > 0; --nbits) {
/* cs [~~~~] SEND 0 */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4);
data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7);
}
/* cs [____] RESET SEND STATE */
/* di [____] */
/* sck [_~~_] */
sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0);
return data;
}
static int __init read_eeprom(struct net_device *dev)
{
unsigned short wrd;
/* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */
wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */
if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */
return -1; /* Nope, not a DE-620 */
nic_data.NodeID[0] = wrd & 0xff;
nic_data.NodeID[1] = wrd >> 8;
wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */
if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */
return -1; /* Nope, not a DE-620 */
nic_data.NodeID[2] = wrd & 0xff;
nic_data.NodeID[3] = wrd >> 8;
wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */
nic_data.NodeID[4] = wrd & 0xff;
nic_data.NodeID[5] = wrd >> 8;
wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */
nic_data.RAM_Size = (wrd >> 8);
wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */
nic_data.Model = (wrd & 0xff);
wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */
nic_data.Media = (wrd & 0xff);
wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */
nic_data.SCR = (wrd >> 8);
return 0; /* no errors */
}
/******************************************************************************
*
* Loadable module skeleton
*
*/
#ifdef MODULE
static struct net_device *de620_dev;
int __init init_module(void)
{
de620_dev = de620_probe(-1);
if (IS_ERR(de620_dev))
return PTR_ERR(de620_dev);
return 0;
}
void cleanup_module(void)
{
unregister_netdev(de620_dev);
release_region(de620_dev->base_addr, 3);
free_netdev(de620_dev);
}
#endif /* MODULE */
MODULE_LICENSE("GPL");
/*
* (add '-DMODULE' when compiling as loadable module)
*
* compile-command:
* gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \
* -fomit-frame-pointer -m486 \
* -I/usr/src/linux/include -I../../net/inet -c de620.c
*/
/*
* Local variables:
* kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
* module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
* compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c"
* End:
*/
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