Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2122 insertions, 0 deletions

diff --git a/drivers/net/depca.c b/drivers/net/depca.c
new file mode 100644
index 000000000000..c4aa5fe2840e
--- /dev/null
+++ b/drivers/net/depca.c
@@ -0,0 +1,2122 @@
+/*  depca.c: A DIGITAL DEPCA & EtherWORKS ethernet driver for linux.
+
+    Written 1994, 1995 by David C. Davies.
+
+
+                      Copyright 1994 David C. Davies
+		                   and 
+			 United States Government
+	 (as represented by the Director, National Security Agency).  
+
+               Copyright 1995  Digital Equipment Corporation.
+
+
+    This software may be used and distributed according to the terms of
+    the GNU General Public License, incorporated herein by reference.
+
+    This driver is written for the Digital Equipment Corporation series
+    of DEPCA and EtherWORKS ethernet cards:
+
+        DEPCA       (the original)
+    	DE100
+    	DE101
+	DE200 Turbo
+	DE201 Turbo
+	DE202 Turbo (TP BNC)
+	DE210
+	DE422       (EISA)
+
+    The  driver has been tested on DE100, DE200 and DE202 cards  in  a
+    relatively busy network. The DE422 has been tested a little.
+
+    This  driver will NOT work   for the DE203,  DE204  and DE205 series  of
+    cards,  since they have  a  new custom ASIC in   place of the AMD  LANCE
+    chip.  See the 'ewrk3.c'   driver in the  Linux  source tree for running
+    those cards.
+
+    I have benchmarked the driver with a  DE100 at 595kB/s to (542kB/s from)
+    a DECstation 5000/200.
+
+    The author may be reached at davies@maniac.ultranet.com
+
+    =========================================================================
+
+    The  driver was originally based  on   the 'lance.c' driver from  Donald
+    Becker   which  is included with  the  standard  driver distribution for
+    linux.  V0.4  is  a complete  re-write  with only  the kernel  interface
+    remaining from the original code.
+
+    1) Lance.c code in /linux/drivers/net/
+    2) "Ethernet/IEEE 802.3 Family. 1992 World Network Data Book/Handbook",
+       AMD, 1992 [(800) 222-9323].
+    3) "Am79C90 CMOS Local Area Network Controller for Ethernet (C-LANCE)",
+       AMD, Pub. #17881, May 1993.
+    4) "Am79C960 PCnet-ISA(tm), Single-Chip Ethernet Controller for ISA",
+       AMD, Pub. #16907, May 1992
+    5) "DEC EtherWORKS LC Ethernet Controller Owners Manual",
+       Digital Equipment corporation, 1990, Pub. #EK-DE100-OM.003
+    6) "DEC EtherWORKS Turbo Ethernet Controller Owners Manual",
+       Digital Equipment corporation, 1990, Pub. #EK-DE200-OM.003
+    7) "DEPCA Hardware Reference Manual", Pub. #EK-DEPCA-PR
+       Digital Equipment Corporation, 1989
+    8) "DEC EtherWORKS Turbo_(TP BNC) Ethernet Controller Owners Manual",
+       Digital Equipment corporation, 1991, Pub. #EK-DE202-OM.001
+    
+
+    Peter Bauer's depca.c (V0.5) was referred to when debugging V0.1 of this
+    driver.
+
+    The original DEPCA  card requires that the  ethernet ROM address counter
+    be enabled to count and has an 8 bit NICSR.  The ROM counter enabling is
+    only  done when a  0x08 is read as the  first address octet (to minimise
+    the chances  of writing over some  other hardware's  I/O register).  The
+    NICSR accesses   have been changed  to  byte accesses  for all the cards
+    supported by this driver, since there is only one  useful bit in the MSB
+    (remote boot timeout) and it  is not used.  Also, there  is a maximum of
+    only 48kB network  RAM for this  card.  My thanks  to Torbjorn Lindh for
+    help debugging all this (and holding my feet to  the fire until I got it
+    right).
+
+    The DE200  series  boards have  on-board 64kB  RAM for  use  as a shared
+    memory network  buffer. Only the DE100  cards make use  of a  2kB buffer
+    mode which has not  been implemented in  this driver (only the 32kB  and
+    64kB modes are supported [16kB/48kB for the original DEPCA]).
+
+    At the most only 2 DEPCA cards can  be supported on  the ISA bus because
+    there is only provision  for two I/O base addresses  on each card (0x300
+    and 0x200). The I/O address is detected by searching for a byte sequence
+    in the Ethernet station address PROM at the expected I/O address for the
+    Ethernet  PROM.   The shared memory  base   address  is 'autoprobed'  by
+    looking  for the self  test PROM  and detecting the  card name.   When a
+    second  DEPCA is  detected,  information  is   placed in the   base_addr
+    variable of the  next device structure (which  is created if necessary),
+    thus  enabling ethif_probe  initialization  for the device.  More than 2
+    EISA cards can  be  supported, but  care will  be  needed assigning  the
+    shared memory to ensure that each slot has the  correct IRQ, I/O address
+    and shared memory address assigned.
+
+    ************************************************************************
+
+    NOTE: If you are using two  ISA DEPCAs, it is  important that you assign
+    the base memory addresses correctly.   The  driver autoprobes I/O  0x300
+    then 0x200.  The  base memory address for  the first device must be less
+    than that of the second so that the auto probe will correctly assign the
+    I/O and memory addresses on the same card.  I can't think of a way to do
+    this unambiguously at the moment, since there is nothing on the cards to
+    tie I/O and memory information together.
+
+    I am unable  to  test  2 cards   together for now,    so this  code   is
+    unchecked. All reports, good or bad, are welcome.
+
+    ************************************************************************
+
+    The board IRQ   setting must be  at an  unused IRQ which  is auto-probed
+    using Donald Becker's autoprobe routines. DEPCA and DE100 board IRQs are
+    {2,3,4,5,7}, whereas the  DE200 is at {5,9,10,11,15}.  Note that IRQ2 is
+    really IRQ9 in machines with 16 IRQ lines.
+
+    No 16MB memory  limitation should exist with this  driver as DMA is  not
+    used and the common memory area is in low memory on the network card (my
+    current system has 20MB and I've not had problems yet).
+
+    The ability to load this driver as a loadable module has been added. To
+    utilise this ability, you have to do <8 things:
+
+    0) have a copy of the loadable modules code installed on your system.
+    1) copy depca.c from the  /linux/drivers/net directory to your favourite
+    temporary directory.
+    2) if you wish, edit the  source code near  line 1530 to reflect the I/O
+    address and IRQ you're using (see also 5).
+    3) compile  depca.c, but include -DMODULE in  the command line to ensure
+    that the correct bits are compiled (see end of source code).
+    4) if you are wanting to add a new  card, goto 5. Otherwise, recompile a
+    kernel with the depca configuration turned off and reboot.
+    5) insmod depca.o [irq=7] [io=0x200] [mem=0xd0000] [adapter_name=DE100]
+       [Alan Cox: Changed the code to allow command line irq/io assignments]
+       [Dave Davies: Changed the code to allow command line mem/name
+                                                                assignments]
+    6) run the net startup bits for your eth?? interface manually 
+    (usually /etc/rc.inet[12] at boot time). 
+    7) enjoy!
+
+    Note that autoprobing is not allowed in loadable modules - the system is
+    already up and running and you're messing with interrupts.
+
+    To unload a module, turn off the associated interface 
+    'ifconfig eth?? down' then 'rmmod depca'.
+
+    To assign a base memory address for the shared memory  when running as a
+    loadable module, see 5 above.  To include the adapter  name (if you have
+    no PROM  but know the card name)  also see 5  above. Note that this last
+    option  will not work  with kernel  built-in  depca's. 
+
+    The shared memory assignment for a loadable module  makes sense to avoid
+    the 'memory autoprobe' picking the wrong shared memory  (for the case of
+    2 depca's in a PC).
+
+    ************************************************************************
+    Support for MCA EtherWORKS cards added 11-3-98.
+    Verified to work with up to 2 DE212 cards in a system (although not
+      fully stress-tested).  
+
+    Currently known bugs/limitations:
+
+    Note:  with the MCA stuff as a module, it trusts the MCA configuration,
+           not the command line for IRQ and memory address.  You can
+           specify them if you want, but it will throw your values out.
+           You still have to pass the IO address it was configured as
+           though.
+
+    ************************************************************************
+    TO DO:
+    ------
+
+
+    Revision History
+    ----------------
+
+    Version   Date        Description
+  
+      0.1     25-jan-94   Initial writing.
+      0.2     27-jan-94   Added LANCE TX hardware buffer chaining.
+      0.3      1-feb-94   Added multiple DEPCA support.
+      0.31     4-feb-94   Added DE202 recognition.
+      0.32    19-feb-94   Tidy up. Improve multi-DEPCA support.
+      0.33    25-feb-94   Fix DEPCA ethernet ROM counter enable.
+                          Add jabber packet fix from murf@perftech.com
+			  and becker@super.org
+      0.34     7-mar-94   Fix DEPCA max network memory RAM & NICSR access.
+      0.35     8-mar-94   Added DE201 recognition. Tidied up.
+      0.351   30-apr-94   Added EISA support. Added DE422 recognition.
+      0.36    16-may-94   DE422 fix released.
+      0.37    22-jul-94   Added MODULE support
+      0.38    15-aug-94   Added DBR ROM switch in depca_close(). 
+                          Multi DEPCA bug fix.
+      0.38axp 15-sep-94   Special version for Alpha AXP Linux V1.0.
+      0.381   12-dec-94   Added DE101 recognition, fix multicast bug.
+      0.382    9-feb-95   Fix recognition bug reported by <bkm@star.rl.ac.uk>.
+      0.383   22-feb-95   Fix for conflict with VESA SCSI reported by
+                          <stromain@alf.dec.com>
+      0.384   17-mar-95   Fix a ring full bug reported by <bkm@star.rl.ac.uk>
+      0.385    3-apr-95   Fix a recognition bug reported by 
+                                                <ryan.niemi@lastfrontier.com>
+      0.386   21-apr-95   Fix the last fix...sorry, must be galloping senility
+      0.40    25-May-95   Rewrite for portability & updated.
+                          ALPHA support from <jestabro@amt.tay1.dec.com>
+      0.41    26-Jun-95   Added verify_area() calls in depca_ioctl() from
+                          suggestion by <heiko@colossus.escape.de>
+      0.42    27-Dec-95   Add 'mem' shared memory assignment for loadable 
+                          modules.
+                          Add 'adapter_name' for loadable modules when no PROM.
+			  Both above from a suggestion by 
+			  <pchen@woodruffs121.residence.gatech.edu>.
+			  Add new multicasting code.
+      0.421   22-Apr-96	  Fix alloc_device() bug <jari@markkus2.fimr.fi>
+      0.422   29-Apr-96	  Fix depca_hw_init() bug <jari@markkus2.fimr.fi>
+      0.423    7-Jun-96   Fix module load bug <kmg@barco.be>
+      0.43    16-Aug-96   Update alloc_device() to conform to de4x5.c
+      0.44     1-Sep-97   Fix *_probe() to test check_region() first - bug
+                           reported by <mmogilvi@elbert.uccs.edu>
+      0.45     3-Nov-98   Added support for MCA EtherWORKS (DE210/DE212) cards
+                           by <tymm@computer.org> 
+      0.451    5-Nov-98   Fixed mca stuff cuz I'm a dummy. <tymm@computer.org>
+      0.5     14-Nov-98   Re-spin for 2.1.x kernels.
+      0.51    27-Jun-99   Correct received packet length for CRC from
+                           report by <worm@dkik.dk>
+      0.52    16-Oct-00   Fixes for 2.3 io memory accesses
+                          Fix show-stopper (ints left masked) in depca_interrupt
+			   by <peterd@pnd-pc.demon.co.uk>
+      0.53    12-Jan-01	  Release resources on failure, bss tidbits
+      			   by acme@conectiva.com.br
+      0.54    08-Nov-01	  use library crc32 functions
+      			   by Matt_Domsch@dell.com
+      0.55    01-Mar-03   Use EISA/sysfs framework <maz@wild-wind.fr.eu.org>
+
+    =========================================================================
+*/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/time.h>
+#include <linux/types.h>
+#include <linux/unistd.h>
+#include <linux/ctype.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#ifdef CONFIG_MCA
+#include <linux/mca.h>
+#endif
+
+#ifdef CONFIG_EISA
+#include <linux/eisa.h>
+#endif
+
+#include "depca.h"
+
+static char version[] __initdata = "depca.c:v0.53 2001/1/12 davies@maniac.ultranet.com\n";
+
+#ifdef DEPCA_DEBUG
+static int depca_debug = DEPCA_DEBUG;
+#else
+static int depca_debug = 1;
+#endif
+
+#define DEPCA_NDA 0xffe0	/* No Device Address */
+
+#define TX_TIMEOUT (1*HZ)
+
+/*
+** Ethernet PROM defines
+*/
+#define PROBE_LENGTH    32
+#define ETH_PROM_SIG    0xAA5500FFUL
+
+/*
+** Set the number of Tx and Rx buffers. Ensure that the memory requested
+** here is <= to the amount of shared memory set up by the board switches.
+** The number of descriptors MUST BE A POWER OF 2.
+**
+** total_memory = NUM_RX_DESC*(8+RX_BUFF_SZ) + NUM_TX_DESC*(8+TX_BUFF_SZ)
+*/
+#define NUM_RX_DESC     8	/* Number of RX descriptors */
+#define NUM_TX_DESC     8	/* Number of TX descriptors */
+#define RX_BUFF_SZ	1536	/* Buffer size for each Rx buffer */
+#define TX_BUFF_SZ	1536	/* Buffer size for each Tx buffer */
+
+/*
+** EISA bus defines
+*/
+#define DEPCA_EISA_IO_PORTS 0x0c00	/* I/O port base address, slot 0 */
+
+/*
+** ISA Bus defines
+*/
+#define DEPCA_RAM_BASE_ADDRESSES {0xc0000,0xd0000,0xe0000,0x00000}
+#define DEPCA_TOTAL_SIZE 0x10
+
+static struct {
+	u_long iobase;
+	struct platform_device *device;
+} depca_io_ports[] = {
+	{ 0x300, NULL },
+	{ 0x200, NULL },
+	{ 0    , NULL },
+};
+
+/*
+** Name <-> Adapter mapping
+*/
+#define DEPCA_SIGNATURE {"DEPCA",\
+			 "DE100","DE101",\
+                         "DE200","DE201","DE202",\
+			 "DE210","DE212",\
+                         "DE422",\
+                         ""}
+
+static char* __initdata depca_signature[] = DEPCA_SIGNATURE;
+
+enum depca_type {
+	DEPCA, de100, de101, de200, de201, de202, de210, de212, de422, unknown
+};
+
+static char depca_string[] = "depca";
+
+static int depca_device_remove (struct device *device);
+
+#ifdef CONFIG_EISA
+static struct eisa_device_id depca_eisa_ids[] = {
+	{ "DEC4220", de422 },
+	{ "" }
+};
+MODULE_DEVICE_TABLE(eisa, depca_eisa_ids);
+
+static int depca_eisa_probe  (struct device *device);
+
+static struct eisa_driver depca_eisa_driver = {
+	.id_table = depca_eisa_ids,
+	.driver   = {
+		.name    = depca_string,
+		.probe   = depca_eisa_probe,
+		.remove  = __devexit_p (depca_device_remove)
+	}
+};
+#endif
+
+#ifdef CONFIG_MCA
+/*
+** Adapter ID for the MCA EtherWORKS DE210/212 adapter
+*/
+#define DE210_ID 0x628d
+#define DE212_ID 0x6def
+
+static short depca_mca_adapter_ids[] = {
+	DE210_ID,
+	DE212_ID,
+	0x0000
+};
+
+static char *depca_mca_adapter_name[] = {
+	"DEC EtherWORKS MC Adapter (DE210)",
+	"DEC EtherWORKS MC Adapter (DE212)",
+	NULL
+};
+
+static enum depca_type depca_mca_adapter_type[] = {
+	de210,
+	de212,
+	0
+};
+
+static int depca_mca_probe (struct device *);
+
+static struct mca_driver depca_mca_driver = {
+	.id_table = depca_mca_adapter_ids,
+	.driver   = {
+		.name   = depca_string,
+		.bus    = &mca_bus_type,
+		.probe  = depca_mca_probe,
+		.remove = __devexit_p(depca_device_remove),
+	},
+};
+#endif
+
+static int depca_isa_probe (struct device *);
+
+static struct device_driver depca_isa_driver = {
+	.name   = depca_string,
+	.bus    = &platform_bus_type,
+	.probe  = depca_isa_probe,
+	.remove = __devexit_p(depca_device_remove),
+};
+	
+/*
+** Miscellaneous info...
+*/
+#define DEPCA_STRLEN 16
+
+/*
+** Memory Alignment. Each descriptor is 4 longwords long. To force a
+** particular alignment on the TX descriptor, adjust DESC_SKIP_LEN and
+** DESC_ALIGN. DEPCA_ALIGN aligns the start address of the private memory area
+** and hence the RX descriptor ring's first entry. 
+*/
+#define DEPCA_ALIGN4      ((u_long)4 - 1)	/* 1 longword align */
+#define DEPCA_ALIGN8      ((u_long)8 - 1)	/* 2 longword (quadword) align */
+#define DEPCA_ALIGN         DEPCA_ALIGN8	/* Keep the LANCE happy... */
+
+/*
+** The DEPCA Rx and Tx ring descriptors. 
+*/
+struct depca_rx_desc {
+	volatile s32 base;
+	s16 buf_length;		/* This length is negative 2's complement! */
+	s16 msg_length;		/* This length is "normal". */
+};
+
+struct depca_tx_desc {
+	volatile s32 base;
+	s16 length;		/* This length is negative 2's complement! */
+	s16 misc;		/* Errors and TDR info */
+};
+
+#define LA_MASK 0x0000ffff	/* LANCE address mask for mapping network RAM
+				   to LANCE memory address space */
+
+/*
+** The Lance initialization block, described in databook, in common memory.
+*/
+struct depca_init {
+	u16 mode;		/* Mode register */
+	u8 phys_addr[ETH_ALEN];	/* Physical ethernet address */
+	u8 mcast_table[8];	/* Multicast Hash Table. */
+	u32 rx_ring;		/* Rx ring base pointer & ring length */
+	u32 tx_ring;		/* Tx ring base pointer & ring length */
+};
+
+#define DEPCA_PKT_STAT_SZ 16
+#define DEPCA_PKT_BIN_SZ  128	/* Should be >=100 unless you
+				   increase DEPCA_PKT_STAT_SZ */
+struct depca_private {
+	char adapter_name[DEPCA_STRLEN];	/* /proc/ioports string                  */
+	enum depca_type adapter;		/* Adapter type */
+	enum {
+                DEPCA_BUS_MCA = 1,
+                DEPCA_BUS_ISA,
+                DEPCA_BUS_EISA,
+        } depca_bus;	        /* type of bus */
+	struct depca_init init_block;	/* Shadow Initialization block            */
+/* CPU address space fields */
+	struct depca_rx_desc __iomem *rx_ring;	/* Pointer to start of RX descriptor ring */
+	struct depca_tx_desc __iomem *tx_ring;	/* Pointer to start of TX descriptor ring */
+	void __iomem *rx_buff[NUM_RX_DESC];	/* CPU virt address of sh'd memory buffs  */
+	void __iomem *tx_buff[NUM_TX_DESC];	/* CPU virt address of sh'd memory buffs  */
+	void __iomem *sh_mem;	/* CPU mapped virt address of device RAM  */
+	u_long mem_start;	/* Bus address of device RAM (before remap) */
+	u_long mem_len;		/* device memory size */
+/* Device address space fields */
+	u_long device_ram_start;	/* Start of RAM in device addr space      */
+/* Offsets used in both address spaces */
+	u_long rx_ring_offset;	/* Offset from start of RAM to rx_ring    */
+	u_long tx_ring_offset;	/* Offset from start of RAM to tx_ring    */
+	u_long buffs_offset;	/* LANCE Rx and Tx buffers start address. */
+/* Kernel-only (not device) fields */
+	int rx_new, tx_new;	/* The next free ring entry               */
+	int rx_old, tx_old;	/* The ring entries to be free()ed.       */
+	struct net_device_stats stats;
+	spinlock_t lock;
+	struct {		/* Private stats counters                 */
+		u32 bins[DEPCA_PKT_STAT_SZ];
+		u32 unicast;
+		u32 multicast;
+		u32 broadcast;
+		u32 excessive_collisions;
+		u32 tx_underruns;
+		u32 excessive_underruns;
+	} pktStats;
+	int txRingMask;		/* TX ring mask                           */
+	int rxRingMask;		/* RX ring mask                           */
+	s32 rx_rlen;		/* log2(rxRingMask+1) for the descriptors */
+	s32 tx_rlen;		/* log2(txRingMask+1) for the descriptors */
+};
+
+/*
+** The transmit ring full condition is described by the tx_old and tx_new
+** pointers by:
+**    tx_old            = tx_new    Empty ring
+**    tx_old            = tx_new+1  Full ring
+**    tx_old+txRingMask = tx_new    Full ring  (wrapped condition)
+*/
+#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
+			 lp->tx_old+lp->txRingMask-lp->tx_new:\
+                         lp->tx_old               -lp->tx_new-1)
+
+/*
+** Public Functions
+*/
+static int depca_open(struct net_device *dev);
+static int depca_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t depca_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int depca_close(struct net_device *dev);
+static int depca_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static void depca_tx_timeout(struct net_device *dev);
+static struct net_device_stats *depca_get_stats(struct net_device *dev);
+static void set_multicast_list(struct net_device *dev);
+
+/*
+** Private functions
+*/
+static void depca_init_ring(struct net_device *dev);
+static int depca_rx(struct net_device *dev);
+static int depca_tx(struct net_device *dev);
+
+static void LoadCSRs(struct net_device *dev);
+static int InitRestartDepca(struct net_device *dev);
+static int DepcaSignature(char *name, u_long paddr);
+static int DevicePresent(u_long ioaddr);
+static int get_hw_addr(struct net_device *dev);
+static void SetMulticastFilter(struct net_device *dev);
+static int load_packet(struct net_device *dev, struct sk_buff *skb);
+static void depca_dbg_open(struct net_device *dev);
+
+static u_char de1xx_irq[] __initdata = { 2, 3, 4, 5, 7, 9, 0 };
+static u_char de2xx_irq[] __initdata = { 5, 9, 10, 11, 15, 0 };
+static u_char de422_irq[] __initdata = { 5, 9, 10, 11, 0 };
+static u_char *depca_irq;
+
+static int irq;
+static int io;
+static char *adapter_name;
+static int mem;			/* For loadable module assignment
+				   use insmod mem=0x????? .... */
+module_param (irq, int, 0);
+module_param (io, int, 0);
+module_param (adapter_name, charp, 0);
+module_param (mem, int, 0);
+MODULE_PARM_DESC(irq, "DEPCA IRQ number");
+MODULE_PARM_DESC(io, "DEPCA I/O base address");
+MODULE_PARM_DESC(adapter_name, "DEPCA adapter name");
+MODULE_PARM_DESC(mem, "DEPCA shared memory address");
+MODULE_LICENSE("GPL");
+
+/*
+** Miscellaneous defines...
+*/
+#define STOP_DEPCA \
+    outw(CSR0, DEPCA_ADDR);\
+    outw(STOP, DEPCA_DATA)
+
+static int __init depca_hw_init (struct net_device *dev, struct device *device)
+{
+	struct depca_private *lp;
+	int i, j, offset, netRAM, mem_len, status = 0;
+	s16 nicsr;
+	u_long ioaddr;
+	u_long mem_start;
+
+	/*
+	 * We are now supposed to enter this function with the
+	 * following fields filled with proper values :
+	 *
+	 * dev->base_addr
+	 * lp->mem_start
+	 * lp->depca_bus
+	 * lp->adapter
+	 *
+	 * dev->irq can be set if known from device configuration (on
+	 * MCA or EISA) or module option. Otherwise, it will be auto
+	 * detected.
+	 */
+
+	ioaddr = dev->base_addr;
+	
+	STOP_DEPCA;
+
+	nicsr = inb(DEPCA_NICSR);
+	nicsr = ((nicsr & ~SHE & ~RBE & ~IEN) | IM);
+	outb(nicsr, DEPCA_NICSR);
+
+	if (inw(DEPCA_DATA) != STOP) {
+		return -ENXIO;
+	}
+
+	lp = (struct depca_private *) dev->priv;
+	mem_start = lp->mem_start;
+
+	if (!mem_start || lp->adapter < DEPCA || lp->adapter >=unknown)
+		return -ENXIO;
+
+	printk ("%s: %s at 0x%04lx",
+	        device->bus_id, depca_signature[lp->adapter], ioaddr);
+	
+	switch (lp->depca_bus) {
+#ifdef CONFIG_MCA
+	case DEPCA_BUS_MCA:
+		printk(" (MCA slot %d)", to_mca_device(device)->slot + 1);
+		break;
+#endif
+
+#ifdef CONFIG_EISA
+	case DEPCA_BUS_EISA:
+		printk(" (EISA slot %d)", to_eisa_device(device)->slot);
+		break;
+#endif
+
+	case DEPCA_BUS_ISA:
+		break;
+
+	default:
+		printk("Unknown DEPCA bus %d\n", lp->depca_bus);
+		return -ENXIO;
+	}
+
+	printk(", h/w address ");
+	status = get_hw_addr(dev);
+	if (status != 0) {
+		printk("      which has an Ethernet PROM CRC error.\n");
+		return -ENXIO;
+	}
+	for (i = 0; i < ETH_ALEN - 1; i++) {	/* get the ethernet address */
+		printk("%2.2x:", dev->dev_addr[i]);
+	}
+	printk("%2.2x", dev->dev_addr[i]);
+
+	/* Set up the maximum amount of network RAM(kB) */
+	netRAM = ((lp->adapter != DEPCA) ? 64 : 48);
+	if ((nicsr & _128KB) && (lp->adapter == de422))
+		netRAM = 128;
+
+	/* Shared Memory Base Address */
+	if (nicsr & BUF) {
+		nicsr &= ~BS;	/* DEPCA RAM in top 32k */
+		netRAM -= 32;
+
+		/* Only EISA/ISA needs start address to be re-computed */
+		if (lp->depca_bus != DEPCA_BUS_MCA)
+			mem_start += 0x8000;
+	}
+	
+	if ((mem_len = (NUM_RX_DESC * (sizeof(struct depca_rx_desc) + RX_BUFF_SZ) + NUM_TX_DESC * (sizeof(struct depca_tx_desc) + TX_BUFF_SZ) + sizeof(struct depca_init)))
+	    > (netRAM << 10)) {
+		printk(",\n       requests %dkB RAM: only %dkB is available!\n", (mem_len >> 10), netRAM);
+		return -ENXIO;
+	}
+
+	printk(",\n      has %dkB RAM at 0x%.5lx", netRAM, mem_start);
+
+	/* Enable the shadow RAM. */
+	if (lp->adapter != DEPCA) {
+		nicsr |= SHE;
+		outb(nicsr, DEPCA_NICSR);
+	}
+
+	spin_lock_init(&lp->lock);
+	sprintf(lp->adapter_name, "%s (%s)",
+		depca_signature[lp->adapter], device->bus_id);
+	status = -EBUSY;
+
+	/* Initialisation Block */
+	if (!request_mem_region (mem_start, mem_len, lp->adapter_name)) {
+		printk(KERN_ERR "depca: cannot request ISA memory, aborting\n");
+		goto out_priv;
+	}
+		
+	status = -EIO;
+	lp->sh_mem = ioremap(mem_start, mem_len);
+	if (lp->sh_mem == NULL) {
+		printk(KERN_ERR "depca: cannot remap ISA memory, aborting\n");
+		goto out1;
+	}
+
+	lp->mem_start = mem_start;
+	lp->mem_len   = mem_len;
+	lp->device_ram_start = mem_start & LA_MASK;
+
+	offset = 0;
+	offset += sizeof(struct depca_init);
+
+	/* Tx & Rx descriptors (aligned to a quadword boundary) */
+	offset = (offset + DEPCA_ALIGN) & ~DEPCA_ALIGN;
+	lp->rx_ring = (struct depca_rx_desc __iomem *) (lp->sh_mem + offset);
+	lp->rx_ring_offset = offset;
+
+	offset += (sizeof(struct depca_rx_desc) * NUM_RX_DESC);
+	lp->tx_ring = (struct depca_tx_desc __iomem *) (lp->sh_mem + offset);
+	lp->tx_ring_offset = offset;
+
+	offset += (sizeof(struct depca_tx_desc) * NUM_TX_DESC);
+
+	lp->buffs_offset = offset;
+
+	/* Finish initialising the ring information. */
+	lp->rxRingMask = NUM_RX_DESC - 1;
+	lp->txRingMask = NUM_TX_DESC - 1;
+
+	/* Calculate Tx/Rx RLEN size for the descriptors. */
+	for (i = 0, j = lp->rxRingMask; j > 0; i++) {
+		j >>= 1;
+	}
+	lp->rx_rlen = (s32) (i << 29);
+	for (i = 0, j = lp->txRingMask; j > 0; i++) {
+		j >>= 1;
+	}
+	lp->tx_rlen = (s32) (i << 29);
+
+	/* Load the initialisation block */
+	depca_init_ring(dev);
+
+	/* Initialise the control and status registers */
+	LoadCSRs(dev);
+
+	/* Enable DEPCA board interrupts for autoprobing */
+	nicsr = ((nicsr & ~IM) | IEN);
+	outb(nicsr, DEPCA_NICSR);
+
+	/* To auto-IRQ we enable the initialization-done and DMA err,
+	   interrupts. For now we will always get a DMA error. */
+	if (dev->irq < 2) {
+		unsigned char irqnum;
+		unsigned long irq_mask, delay;
+
+		irq_mask = probe_irq_on();
+
+		/* Assign the correct irq list */
+		switch (lp->adapter) {
+		case DEPCA:
+		case de100:
+		case de101:
+			depca_irq = de1xx_irq;
+			break;
+		case de200:
+		case de201:
+		case de202:
+		case de210:
+		case de212:
+			depca_irq = de2xx_irq;
+			break;
+		case de422:
+			depca_irq = de422_irq;
+			break;
+
+		default:
+			break;	/* Not reached */
+		}
+
+		/* Trigger an initialization just for the interrupt. */
+		outw(INEA | INIT, DEPCA_DATA);
+
+		delay = jiffies + HZ/50;
+		while (time_before(jiffies, delay))
+			yield();
+
+		irqnum = probe_irq_off(irq_mask);
+
+		status = -ENXIO;
+		if (!irqnum) {
+			printk(" and failed to detect IRQ line.\n");
+			goto out2;
+		} else {
+			for (dev->irq = 0, i = 0; (depca_irq[i]) && (!dev->irq); i++)
+				if (irqnum == depca_irq[i]) {
+					dev->irq = irqnum;
+					printk(" and uses IRQ%d.\n", dev->irq);
+				}
+
+			if (!dev->irq) {
+				printk(" but incorrect IRQ line detected.\n");
+				goto out2;
+			}
+		}
+	} else {
+		printk(" and assigned IRQ%d.\n", dev->irq);
+	}
+
+	if (depca_debug > 1) {
+		printk(version);
+	}
+
+	/* The DEPCA-specific entries in the device structure. */
+	dev->open = &depca_open;
+	dev->hard_start_xmit = &depca_start_xmit;
+	dev->stop = &depca_close;
+	dev->get_stats = &depca_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+	dev->do_ioctl = &depca_ioctl;
+	dev->tx_timeout = depca_tx_timeout;
+	dev->watchdog_timeo = TX_TIMEOUT;
+
+	dev->mem_start = 0;
+
+	device->driver_data = dev;
+	SET_NETDEV_DEV (dev, device);
+	
+	status = register_netdev(dev);
+	if (status == 0)
+		return 0;
+out2:
+	iounmap(lp->sh_mem);
+out1:
+	release_mem_region (mem_start, mem_len);
+out_priv:
+	return status;
+}
+
+
+static int depca_open(struct net_device *dev)
+{
+	struct depca_private *lp = (struct depca_private *) dev->priv;
+	u_long ioaddr = dev->base_addr;
+	s16 nicsr;
+	int status = 0;
+
+	STOP_DEPCA;
+	nicsr = inb(DEPCA_NICSR);
+
+	/* Make sure the shadow RAM is enabled */
+	if (lp->adapter != DEPCA) {
+		nicsr |= SHE;
+		outb(nicsr, DEPCA_NICSR);
+	}
+
+	/* Re-initialize the DEPCA... */
+	depca_init_ring(dev);
+	LoadCSRs(dev);
+
+	depca_dbg_open(dev);
+
+	if (request_irq(dev->irq, &depca_interrupt, 0, lp->adapter_name, dev)) {
+		printk("depca_open(): Requested IRQ%d is busy\n", dev->irq);
+		status = -EAGAIN;
+	} else {
+
+		/* Enable DEPCA board interrupts and turn off LED */
+		nicsr = ((nicsr & ~IM & ~LED) | IEN);
+		outb(nicsr, DEPCA_NICSR);
+		outw(CSR0, DEPCA_ADDR);
+
+		netif_start_queue(dev);
+
+		status = InitRestartDepca(dev);
+
+		if (depca_debug > 1) {
+			printk("CSR0: 0x%4.4x\n", inw(DEPCA_DATA));
+			printk("nicsr: 0x%02x\n", inb(DEPCA_NICSR));
+		}
+	}
+	return status;
+}
+
+/* Initialize the lance Rx and Tx descriptor rings. */
+static void depca_init_ring(struct net_device *dev)
+{
+	struct depca_private *lp = (struct depca_private *) dev->priv;
+	u_int i;
+	u_long offset;
+
+	/* Lock out other processes whilst setting up the hardware */
+	netif_stop_queue(dev);
+
+	lp->rx_new = lp->tx_new = 0;
+	lp->rx_old = lp->tx_old = 0;
+
+	/* Initialize the base address and length of each buffer in the ring */
+	for (i = 0; i <= lp->rxRingMask; i++) {
+		offset = lp->buffs_offset + i * RX_BUFF_SZ;
+		writel((lp->device_ram_start + offset) | R_OWN, &lp->rx_ring[i].base);
+		writew(-RX_BUFF_SZ, &lp->rx_ring[i].buf_length);
+		lp->rx_buff[i] = lp->sh_mem + offset;
+	}
+
+	for (i = 0; i <= lp->txRingMask; i++) {
+		offset = lp->buffs_offset + (i + lp->rxRingMask + 1) * TX_BUFF_SZ;
+		writel((lp->device_ram_start + offset) & 0x00ffffff, &lp->tx_ring[i].base);
+		lp->tx_buff[i] = lp->sh_mem + offset;
+	}
+
+	/* Set up the initialization block */
+	lp->init_block.rx_ring = (lp->device_ram_start + lp->rx_ring_offset) | lp->rx_rlen;
+	lp->init_block.tx_ring = (lp->device_ram_start + lp->tx_ring_offset) | lp->tx_rlen;
+
+	SetMulticastFilter(dev);
+
+	for (i = 0; i < ETH_ALEN; i++) {
+		lp->init_block.phys_addr[i] = dev->dev_addr[i];
+	}
+
+	lp->init_block.mode = 0x0000;	/* Enable the Tx and Rx */
+}
+
+
+static void depca_tx_timeout(struct net_device *dev)
+{
+	u_long ioaddr = dev->base_addr;
+
+	printk("%s: transmit timed out, status %04x, resetting.\n", dev->name, inw(DEPCA_DATA));
+
+	STOP_DEPCA;
+	depca_init_ring(dev);
+	LoadCSRs(dev);
+	dev->trans_start = jiffies;
+	netif_wake_queue(dev);
+	InitRestartDepca(dev);
+}
+
+
+/* 
+** Writes a socket buffer to TX descriptor ring and starts transmission 
+*/
+static int depca_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct depca_private *lp = (struct depca_private *) dev->priv;
+	u_long ioaddr = dev->base_addr;
+	int status = 0;
+
+	/* Transmitter timeout, serious problems. */
+	if (skb->len < 1)
+		goto out;
+
+	if (skb->len < ETH_ZLEN) {
+		skb = skb_padto(skb, ETH_ZLEN);
+		if (skb == NULL)
+			goto out;
+	}
+	
+	netif_stop_queue(dev);
+
+	if (TX_BUFFS_AVAIL) {	/* Fill in a Tx ring entry */
+		status = load_packet(dev, skb);
+
+		if (!status) {
+			/* Trigger an immediate send demand. */
+			outw(CSR0, DEPCA_ADDR);
+			outw(INEA | TDMD, DEPCA_DATA);
+
+			dev->trans_start = jiffies;
+			dev_kfree_skb(skb);
+		}
+		if (TX_BUFFS_AVAIL)
+			netif_start_queue(dev);
+	} else
+		status = -1;
+
+      out:
+	return status;
+}
+
+/*
+** The DEPCA interrupt handler. 
+*/
+static irqreturn_t depca_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct depca_private *lp;
+	s16 csr0, nicsr;
+	u_long ioaddr;
+
+	if (dev == NULL) {
+		printk("depca_interrupt(): irq %d for unknown device.\n", irq);
+		return IRQ_NONE;
+	}
+
+	lp = (struct depca_private *) dev->priv;
+	ioaddr = dev->base_addr;
+
+	spin_lock(&lp->lock);
+
+	/* mask the DEPCA board interrupts and turn on the LED */
+	nicsr = inb(DEPCA_NICSR);
+	nicsr |= (IM | LED);
+	outb(nicsr, DEPCA_NICSR);
+
+	outw(CSR0, DEPCA_ADDR);
+	csr0 = inw(DEPCA_DATA);
+
+	/* Acknowledge all of the current interrupt sources ASAP. */
+	outw(csr0 & INTE, DEPCA_DATA);
+
+	if (csr0 & RINT)	/* Rx interrupt (packet arrived) */
+		depca_rx(dev);
+
+	if (csr0 & TINT)	/* Tx interrupt (packet sent) */
+		depca_tx(dev);
+
+	/* Any resources available? */
+	if ((TX_BUFFS_AVAIL >= 0) && netif_queue_stopped(dev)) {
+		netif_wake_queue(dev);
+	}
+
+	/* Unmask the DEPCA board interrupts and turn off the LED */
+	nicsr = (nicsr & ~IM & ~LED);
+	outb(nicsr, DEPCA_NICSR);
+
+	spin_unlock(&lp->lock);
+	return IRQ_HANDLED;
+}
+
+/* Called with lp->lock held */
+static int depca_rx(struct net_device *dev)
+{
+	struct depca_private *lp = (struct depca_private *) dev->priv;
+	int i, entry;
+	s32 status;
+
+	for (entry = lp->rx_new; !(readl(&lp->rx_ring[entry].base) & R_OWN); entry = lp->rx_new) {
+		status = readl(&lp->rx_ring[entry].base) >> 16;
+		if (status & R_STP) {	/* Remember start of frame */
+			lp->rx_old = entry;
+		}
+		if (status & R_ENP) {	/* Valid frame status */
+			if (status & R_ERR) {	/* There was an error. */
+				lp->stats.rx_errors++;	/* Update the error stats. */
+				if (status & R_FRAM)
+					lp->stats.rx_frame_errors++;
+				if (status & R_OFLO)
+					lp->stats.rx_over_errors++;
+				if (status & R_CRC)
+					lp->stats.rx_crc_errors++;
+				if (status & R_BUFF)
+					lp->stats.rx_fifo_errors++;
+			} else {
+				short len, pkt_len = readw(&lp->rx_ring[entry].msg_length) - 4;
+				struct sk_buff *skb;
+
+				skb = dev_alloc_skb(pkt_len + 2);
+				if (skb != NULL) {
+					unsigned char *buf;
+					skb_reserve(skb, 2);	/* 16 byte align the IP header */
+					buf = skb_put(skb, pkt_len);
+					skb->dev = dev;
+					if (entry < lp->rx_old) {	/* Wrapped buffer */
+						len = (lp->rxRingMask - lp->rx_old + 1) * RX_BUFF_SZ;
+						memcpy_fromio(buf, lp->rx_buff[lp->rx_old], len);
+						memcpy_fromio(buf + len, lp->rx_buff[0], pkt_len - len);
+					} else {	/* Linear buffer */
+						memcpy_fromio(buf, lp->rx_buff[lp->rx_old], pkt_len);
+					}<