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1da177e4c3
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!
966 lines
29 KiB
C
966 lines
29 KiB
C
/* 3c507.c: An EtherLink16 device driver for Linux. */
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/*
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Written 1993,1994 by Donald Becker.
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Copyright 1993 United States Government as represented by the
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Director, National Security Agency.
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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The author may be reached as becker@scyld.com, or C/O
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Scyld Computing Corporation
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410 Severn Ave., Suite 210
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Annapolis MD 21403
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Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings)
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and jrs@world.std.com (Rick Sladkey) for testing and bugfixes.
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Mark Salazar <leslie@access.digex.net> made the changes for cards with
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only 16K packet buffers.
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Things remaining to do:
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Verify that the tx and rx buffers don't have fencepost errors.
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Move the theory of operation and memory map documentation.
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The statistics need to be updated correctly.
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*/
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#define DRV_NAME "3c507"
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#define DRV_VERSION "1.10a"
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#define DRV_RELDATE "11/17/2001"
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static const char version[] =
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DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Donald Becker (becker@scyld.com)\n";
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/*
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Sources:
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This driver wouldn't have been written with the availability of the
|
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Crynwr driver source code. It provided a known-working implementation
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that filled in the gaping holes of the Intel documentation. Three cheers
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for Russ Nelson.
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Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
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info that the casual reader might think that it documents the i82586 :-<.
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||
*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
|
||
#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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||
#include <linux/in.h>
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||
#include <linux/string.h>
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||
#include <linux/spinlock.h>
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||
#include <linux/ethtool.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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/* use 0 for production, 1 for verification, 2..7 for debug */
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#ifndef NET_DEBUG
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#define NET_DEBUG 1
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#endif
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static unsigned int net_debug = NET_DEBUG;
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#define debug net_debug
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/*
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Details of the i82586.
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You'll really need the databook to understand the details of this part,
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but the outline is that the i82586 has two separate processing units.
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Both are started from a list of three configuration tables, of which only
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the last, the System Control Block (SCB), is used after reset-time. The SCB
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has the following fields:
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Status word
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Command word
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Tx/Command block addr.
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Rx block addr.
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The command word accepts the following controls for the Tx and Rx units:
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*/
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#define CUC_START 0x0100
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#define CUC_RESUME 0x0200
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#define CUC_SUSPEND 0x0300
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#define RX_START 0x0010
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#define RX_RESUME 0x0020
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#define RX_SUSPEND 0x0030
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/* The Rx unit uses a list of frame descriptors and a list of data buffer
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descriptors. We use full-sized (1518 byte) data buffers, so there is
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a one-to-one pairing of frame descriptors to buffer descriptors.
|
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|
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The Tx ("command") unit executes a list of commands that look like:
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Status word Written by the 82586 when the command is done.
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Command word Command in lower 3 bits, post-command action in upper 3
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Link word The address of the next command.
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Parameters (as needed).
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Some definitions related to the Command Word are:
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*/
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#define CMD_EOL 0x8000 /* The last command of the list, stop. */
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#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
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#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
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enum commands {
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CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
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CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
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/* Information that need to be kept for each board. */
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struct net_local {
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struct net_device_stats stats;
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int last_restart;
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ushort rx_head;
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ushort rx_tail;
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ushort tx_head;
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ushort tx_cmd_link;
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ushort tx_reap;
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ushort tx_pkts_in_ring;
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spinlock_t lock;
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void __iomem *base;
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};
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/*
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Details of the EtherLink16 Implementation
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The 3c507 is a generic shared-memory i82586 implementation.
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The host can map 16K, 32K, 48K, or 64K of the 64K memory into
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0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
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*/
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/* Offsets from the base I/O address. */
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#define SA_DATA 0 /* Station address data, or 3Com signature. */
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#define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
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#define RESET_IRQ 10 /* Reset the latched IRQ line. */
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#define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
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#define ROM_CONFIG 13
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#define MEM_CONFIG 14
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#define IRQ_CONFIG 15
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#define EL16_IO_EXTENT 16
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/* The ID port is used at boot-time to locate the ethercard. */
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#define ID_PORT 0x100
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/* Offsets to registers in the mailbox (SCB). */
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#define iSCB_STATUS 0x8
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#define iSCB_CMD 0xA
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#define iSCB_CBL 0xC /* Command BLock offset. */
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#define iSCB_RFA 0xE /* Rx Frame Area offset. */
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/* Since the 3c507 maps the shared memory window so that the last byte is
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at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
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48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
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We can account for this be setting the 'SBC Base' entry in the ISCP table
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below for all the 16 bit offset addresses, and also adding the 'SCB Base'
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value to all 24 bit physical addresses (in the SCP table and the TX and RX
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Buffer Descriptors).
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-Mark
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*/
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#define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
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/*
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What follows in 'init_words[]' is the "program" that is downloaded to the
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82586 memory. It's mostly tables and command blocks, and starts at the
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reset address 0xfffff6. This is designed to be similar to the EtherExpress,
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thus the unusual location of the SCB at 0x0008.
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Even with the additional "don't care" values, doing it this way takes less
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program space than initializing the individual tables, and I feel it's much
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cleaner.
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The databook is particularly useless for the first two structures, I had
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to use the Crynwr driver as an example.
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The memory setup is as follows:
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*/
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#define CONFIG_CMD 0x0018
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#define SET_SA_CMD 0x0024
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#define SA_OFFSET 0x002A
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#define IDLELOOP 0x30
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#define TDR_CMD 0x38
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#define TDR_TIME 0x3C
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#define DUMP_CMD 0x40
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#define DIAG_CMD 0x48
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#define SET_MC_CMD 0x4E
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#define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
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#define TX_BUF_START 0x0100
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#define NUM_TX_BUFS 5
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#define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
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#define RX_BUF_START 0x2000
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#define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
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#define RX_BUF_END (dev->mem_end - dev->mem_start)
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#define TX_TIMEOUT 5
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/*
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That's it: only 86 bytes to set up the beast, including every extra
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command available. The 170 byte buffer at DUMP_DATA is shared between the
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Dump command (called only by the diagnostic program) and the SetMulticastList
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command.
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To complete the memory setup you only have to write the station address at
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SA_OFFSET and create the Tx & Rx buffer lists.
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The Tx command chain and buffer list is setup as follows:
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A Tx command table, with the data buffer pointing to...
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A Tx data buffer descriptor. The packet is in a single buffer, rather than
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chaining together several smaller buffers.
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A NoOp command, which initially points to itself,
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And the packet data.
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A transmit is done by filling in the Tx command table and data buffer,
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re-writing the NoOp command, and finally changing the offset of the last
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command to point to the current Tx command. When the Tx command is finished,
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it jumps to the NoOp, when it loops until the next Tx command changes the
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"link offset" in the NoOp. This way the 82586 never has to go through the
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slow restart sequence.
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The Rx buffer list is set up in the obvious ring structure. We have enough
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memory (and low enough interrupt latency) that we can avoid the complicated
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Rx buffer linked lists by alway associating a full-size Rx data buffer with
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each Rx data frame.
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I current use four transmit buffers starting at TX_BUF_START (0x0100), and
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use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
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*/
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static unsigned short init_words[] = {
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/* System Configuration Pointer (SCP). */
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0x0000, /* Set bus size to 16 bits. */
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0,0, /* pad words. */
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0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
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/* Intermediate System Configuration Pointer (ISCP). */
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0x0001, /* Status word that's cleared when init is done. */
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0x0008,0,0, /* SCB offset, (skip, skip) */
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/* System Control Block (SCB). */
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0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
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CONFIG_CMD, /* Command list pointer, points to Configure. */
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RX_BUF_START, /* Rx block list. */
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0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
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/* 0x0018: Configure command. Change to put MAC data with packet. */
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0, CmdConfigure, /* Status, command. */
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SET_SA_CMD, /* Next command is Set Station Addr. */
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0x0804, /* "4" bytes of config data, 8 byte FIFO. */
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0x2e40, /* Magic values, including MAC data location. */
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0, /* Unused pad word. */
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/* 0x0024: Setup station address command. */
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0, CmdSASetup,
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SET_MC_CMD, /* Next command. */
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0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
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/* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
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0, CmdNOp, IDLELOOP, 0 /* pad */,
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/* 0x0038: A unused Time-Domain Reflectometer command. */
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0, CmdTDR, IDLELOOP, 0,
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/* 0x0040: An unused Dump State command. */
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0, CmdDump, IDLELOOP, DUMP_DATA,
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/* 0x0048: An unused Diagnose command. */
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0, CmdDiagnose, IDLELOOP,
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/* 0x004E: An empty set-multicast-list command. */
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0, CmdMulticastList, IDLELOOP, 0,
|
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};
|
||
|
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/* Index to functions, as function prototypes. */
|
||
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static int el16_probe1(struct net_device *dev, int ioaddr);
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static int el16_open(struct net_device *dev);
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static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
|
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static irqreturn_t el16_interrupt(int irq, void *dev_id, struct pt_regs *regs);
|
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static void el16_rx(struct net_device *dev);
|
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static int el16_close(struct net_device *dev);
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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);
|
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static struct ethtool_ops netdev_ethtool_ops;
|
||
static void init_rx_bufs(struct net_device *);
|
||
|
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static int io = 0x300;
|
||
static int irq;
|
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static int mem_start;
|
||
|
||
|
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/* Check for a network adaptor of this type, and return '0' iff one exists.
|
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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 pt_regs *regs)
|
||
{
|
||
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 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_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:
|
||
*/
|