898 lines
27 KiB
C
898 lines
27 KiB
C
/* 3c507.c: An EtherLink16 device driver for Linux. */
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/*
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Written 1993 by Donald Becker.
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Copyright 1993 United States Government as represented by the Director,
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National Security Agency. This software may only be used and distributed
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according to the terms of the GNU Public License as modified by SRC,
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incorported herein by reference.
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The author may be reached as becker@super.org or
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C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715
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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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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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static char *version =
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"3c507.c:v0.03 10/27/93 Donald Becker (becker@super.org)\n";
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#include <linux/config.h>
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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 documention. 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/kernel.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <errno.h>
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#include <memory.h>
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#include "dev.h"
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#include "eth.h"
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#include "skbuff.h"
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#include "arp.h"
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#ifndef HAVE_ALLOC_SKB
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#define alloc_skb(size, priority) (struct sk_buff *) kmalloc(size,priority)
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#define kfree_skbmem(addr, size) kfree_s(addr,size);
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#else
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#include <linux/malloc.h>
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#endif
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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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/*
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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 seperate 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 fileds:
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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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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 enet_statistics 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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};
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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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/* 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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/*
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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 4
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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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/*
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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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short init_words[] = {
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0x0000, /* Set bus size to 16 bits. */
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0x0000,0x0000, /* Set control mailbox (SCB) addr. */
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0,0, /* pad to 0x000000. */
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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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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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extern int el16_probe(struct device *dev); /* Called from Space.c */
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static int el16_probe1(struct device *dev, short ioaddr);
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static int el16_open(struct device *dev);
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static int el16_send_packet(struct sk_buff *skb, struct device *dev);
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static void el16_interrupt(int reg_ptr);
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static void el16_rx(struct device *dev);
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static int el16_close(struct device *dev);
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static struct enet_statistics *el16_get_stats(struct device *dev);
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static void hardware_send_packet(struct device *dev, void *buf, short length);
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void init_82586_mem(struct device *dev);
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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.
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If dev->base_addr == 1, always return failure.
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If dev->base_addr == 2, (detachable devices only) alloate space for the
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device and return success.
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*/
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int
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el16_probe(struct device *dev)
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{
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/* Don't probe all settable addresses, 0x[23][0-F]0, just common ones. */
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int *port, ports[] = {0x300, 0x320, 0x340, 0x280, 0};
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int base_addr = dev->base_addr;
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ushort lrs_state = 0xff, i;
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if (base_addr > 0x1ff) /* Check a single specified location. */
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return el16_probe1(dev, base_addr);
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else if (base_addr > 0)
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return ENXIO; /* Don't probe at all. */
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/* Send the ID sequence to the ID_PORT to enable the board. */
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outb(0x00, ID_PORT);
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for(i = 0; i < 255; i++) {
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outb(lrs_state, ID_PORT);
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lrs_state <<= 1;
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if (lrs_state & 0x100)
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lrs_state ^= 0xe7;
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}
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outb(0x00, ID_PORT);
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for (port = &ports[0]; *port; port++) {
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short ioaddr = *port;
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#if 0
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/* This is my original code. */
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if (inb(ioaddr) == '*' && inb(ioaddr+1) == '3'
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&& inb(ioaddr+2) == 'C' && inb(ioaddr+3) == 'O'
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&& el16_probe1(dev, *port) == 0)
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return 0;
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#else
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/* This is code from jennings@Montrouge.SMR.slb.com, done so that
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the string can be printed out. */
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char res[5];
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res[0] = inb(ioaddr); res[1] = inb(ioaddr+1);
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res[2] = inb(ioaddr+2); res[3] = inb(ioaddr+3);
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res[4] = 0;
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if (res[0] == '*' && res[1] == '3'
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&& res[2] == 'C' && res[3] == 'O'
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&& el16_probe1(dev, *port) == 0)
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return 0;
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#endif
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}
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return ENODEV; /* ENODEV would be more accurate. */
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}
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int el16_probe1(struct device *dev, short ioaddr)
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{
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int i, irq, irqval;
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printk("%s: 3c507 at %#x,", dev->name, ioaddr);
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/* We should make a few more checks here, like the first three octets of
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the S.A. for the manufactor's code. */
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irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
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irqval = request_irq(irq, &el16_interrupt);
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if (irqval) {
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printk ("unable to get IRQ %d (irqval=%d).\n", irq, irqval);
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return EAGAIN;
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}
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/* We've committed to using the board, and can start filling in *dev. */
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snarf_region(ioaddr, 16);
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dev->base_addr = ioaddr;
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outb(0x01, ioaddr + MISC_CTRL);
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for (i = 0; i < 6; i++) {
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dev->dev_addr[i] = inb(ioaddr + i);
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printk(" %02x", dev->dev_addr[i]);
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}
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if ((dev->mem_start & 0xf) > 0)
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net_debug = dev->mem_start & 7;
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#ifdef MEM_BASE
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dev->mem_start = MEM_BASE;
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dev->mem_end = dev->mem_start + 0x10000;
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#else
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{
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int base;
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int size;
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char mem_config = inb(ioaddr + MEM_CONFIG);
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if (mem_config & 0x20) {
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size = 64*1024;
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base = 0xf00000 + (mem_config & 0x08 ? 0x080000
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: ((mem_config & 3) << 17));
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} else {
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size = ((mem_config & 3) + 1) << 14;
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base = 0x0c0000 + ( (mem_config & 0x18) << 12);
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}
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if (size != 0x10000)
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printk("%s: Warning, this version probably only works with 64K of"
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"shared memory.\n", dev->name);
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dev->mem_start = base;
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dev->mem_end = base + size;
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}
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#endif
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dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
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dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
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printk(", IRQ %d, %sternal xcvr, memory %#x-%#x.\n", dev->irq,
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dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
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if (net_debug)
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printk(version);
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/* Initialize the device structure. */
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dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
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memset(dev->priv, 0, sizeof(struct net_local));
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dev->open = el16_open;
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dev->stop = el16_close;
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dev->hard_start_xmit = el16_send_packet;
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dev->get_stats = el16_get_stats;
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/* Fill in the fields of the device structure with ethernet-generic values.
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This should be in a common file instead of per-driver. */
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for (i = 0; i < DEV_NUMBUFFS; i++)
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dev->buffs[i] = NULL;
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dev->hard_header = eth_header;
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dev->add_arp = eth_add_arp;
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dev->queue_xmit = dev_queue_xmit;
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dev->rebuild_header = eth_rebuild_header;
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dev->type_trans = eth_type_trans;
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dev->type = ARPHRD_ETHER;
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dev->hard_header_len = ETH_HLEN;
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dev->mtu = 1500; /* eth_mtu */
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dev->addr_len = ETH_ALEN;
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for (i = 0; i < ETH_ALEN; i++) {
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dev->broadcast[i]=0xff;
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}
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/* New-style flags. */
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dev->flags = IFF_BROADCAST;
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dev->family = AF_INET;
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dev->pa_addr = 0;
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dev->pa_brdaddr = 0;
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dev->pa_mask = 0;
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dev->pa_alen = sizeof(unsigned long);
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return 0;
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}
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static int
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el16_open(struct device *dev)
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{
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irq2dev_map[dev->irq] = dev;
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/* Initialize the 82586 memory and start it. */
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init_82586_mem(dev);
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dev->tbusy = 0;
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dev->interrupt = 0;
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dev->start = 1;
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return 0;
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}
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static int
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el16_send_packet(struct sk_buff *skb, struct device *dev)
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{
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struct net_local *lp = (struct net_local *)dev->priv;
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int ioaddr = dev->base_addr;
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short *shmem = (short*)dev->mem_start;
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if (dev->tbusy) {
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/* If we get here, some higher level has decided we are broken.
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There should really be a "kick me" function call instead. */
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int tickssofar = jiffies - dev->trans_start;
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if (tickssofar < 5)
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return 1;
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if (net_debug > 1)
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printk("%s: transmit timed out, %s? ", dev->name,
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shmem[iSCB_STATUS>>1] & 0x8000 ? "IRQ conflict" :
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"network cable problem");
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/* Try to restart the adaptor. */
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if (lp->last_restart == lp->stats.tx_packets) {
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if (net_debug > 1) printk("Resetting board.\n");
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/* Completely reset the adaptor. */
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init_82586_mem(dev);
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} else {
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/* Issue the channel attention signal and hope it "gets better". */
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if (net_debug > 1) printk("Kicking board.\n");
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shmem[iSCB_CMD>>1] = 0xf000|CUC_START|RX_START;
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outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
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lp->last_restart = lp->stats.tx_packets;
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}
|
||
dev->tbusy=0;
|
||
dev->trans_start = jiffies;
|
||
}
|
||
|
||
/* If some higher layer thinks we've missed an tx-done interrupt
|
||
we are passed NULL. Caution: dev_tint() handles the cli()/sti()
|
||
itself. */
|
||
if (skb == NULL) {
|
||
dev_tint(dev);
|
||
return 0;
|
||
}
|
||
|
||
/* For ethernet, fill in the header. This should really be done by a
|
||
higher level, rather than duplicated for each ethernet adaptor. */
|
||
if (!skb->arp && dev->rebuild_header(skb->data, dev)) {
|
||
skb->dev = dev;
|
||
arp_queue (skb);
|
||
return 0;
|
||
}
|
||
skb->arp=1;
|
||
|
||
/* Block a timer-based transmit from overlapping. */
|
||
if (set_bit(0, (void*)&dev->tbusy) != 0)
|
||
printk("%s: Transmitter access conflict.\n", dev->name);
|
||
else {
|
||
short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
|
||
unsigned char *buf = skb->data;
|
||
|
||
/* Disable the 82586's input to the interrupt line. */
|
||
outb(0x80, ioaddr + MISC_CTRL);
|
||
hardware_send_packet(dev, buf, length);
|
||
dev->trans_start = jiffies;
|
||
/* Enable the 82586 interrupt input. */
|
||
outb(0x84, ioaddr + MISC_CTRL);
|
||
}
|
||
|
||
if (skb->free)
|
||
kfree_skb (skb, FREE_WRITE);
|
||
|
||
/* 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 void
|
||
el16_interrupt(int reg_ptr)
|
||
{
|
||
int irq = -(((struct pt_regs *)reg_ptr)->orig_eax+2);
|
||
struct device *dev = (struct device *)(irq2dev_map[irq]);
|
||
struct net_local *lp;
|
||
int ioaddr, status, boguscount = 0;
|
||
ushort ack_cmd = 0;
|
||
ushort *shmem;
|
||
|
||
if (dev == NULL) {
|
||
printk ("net_interrupt(): irq %d for unknown device.\n", irq);
|
||
return;
|
||
}
|
||
dev->interrupt = 1;
|
||
|
||
ioaddr = dev->base_addr;
|
||
lp = (struct net_local *)dev->priv;
|
||
shmem = ((ushort*)dev->mem_start);
|
||
|
||
status = shmem[iSCB_STATUS>>1];
|
||
|
||
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_reap != lp->tx_head) {
|
||
unsigned short tx_status = shmem[lp->tx_reap>>1];
|
||
|
||
if (tx_status == 0) {
|
||
if (net_debug > 5) printk("Couldn't reap %#x.\n", lp->tx_reap);
|
||
break;
|
||
}
|
||
if (tx_status & 0x2000) {
|
||
lp->stats.tx_packets++;
|
||
lp->stats.collisions += tx_status & 0xf;
|
||
dev->tbusy = 0;
|
||
mark_bh(INET_BH); /* Inform upper layers. */
|
||
} else {
|
||
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++;
|
||
}
|
||
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;
|
||
if (++boguscount > 4)
|
||
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 && dev->start) {
|
||
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 && dev->start) {
|
||
static void init_rx_bufs(struct device *);
|
||
/* 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);
|
||
shmem[iSCB_RFA >> 1] = RX_BUF_START;
|
||
ack_cmd |= RX_START;
|
||
}
|
||
|
||
shmem[iSCB_CMD>>1] = ack_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);
|
||
|
||
return;
|
||
}
|
||
|
||
static int
|
||
el16_close(struct device *dev)
|
||
{
|
||
int ioaddr = dev->base_addr;
|
||
ushort *shmem = (short*)dev->mem_start;
|
||
|
||
dev->tbusy = 1;
|
||
dev->start = 0;
|
||
|
||
/* Flush the Tx and disable Rx. */
|
||
shmem[iSCB_CMD >> 1] = RX_SUSPEND | CUC_SUSPEND;
|
||
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().
|
||
We do remove ourselves from the map. */
|
||
|
||
irq2dev_map[dev->irq] = 0;
|
||
|
||
/* Update the statistics here. */
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Get the current statistics. This may be called with the card open or
|
||
closed. */
|
||
static struct enet_statistics *
|
||
el16_get_stats(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
|
||
/* 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 device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
unsigned short *write_ptr;
|
||
|
||
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 = (unsigned short *)(dev->mem_start + cur_rxbuf);
|
||
|
||
*write_ptr++ = 0x0000; /* Status */
|
||
*write_ptr++ = 0x0000; /* Command */
|
||
*write_ptr++ = cur_rxbuf + RX_BUF_SIZE; /* Link */
|
||
*write_ptr++ = cur_rxbuf + 22; /* Buffer offset */
|
||
*write_ptr++ = 0x0000; /* Pad for dest addr. */
|
||
*write_ptr++ = 0x0000;
|
||
*write_ptr++ = 0x0000;
|
||
*write_ptr++ = 0x0000; /* Pad for source addr. */
|
||
*write_ptr++ = 0x0000;
|
||
*write_ptr++ = 0x0000;
|
||
*write_ptr++ = 0x0000; /* Pad for protocol. */
|
||
|
||
*write_ptr++ = 0x0000; /* Buffer: Actual count */
|
||
*write_ptr++ = -1; /* Buffer: Next (none). */
|
||
*write_ptr++ = cur_rxbuf + 0x20; /* Buffer: Address low */
|
||
*write_ptr++ = 0x0000;
|
||
/* Finally, the number of bytes in the buffer. */
|
||
*write_ptr++ = 0x8000 + RX_BUF_SIZE-0x20;
|
||
|
||
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 = (unsigned short *)
|
||
(dev->mem_start + lp->rx_tail + 2);
|
||
*write_ptr++ = 0xC000; /* Command, mark as last. */
|
||
*write_ptr++ = lp->rx_head; /* Link */
|
||
|
||
}
|
||
|
||
void
|
||
init_82586_mem(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short ioaddr = dev->base_addr;
|
||
ushort *shmem = (short*)dev->mem_start;
|
||
|
||
/* Enable loopback to protect the wire while starting up,
|
||
and hold the 586 in reset during the memory initialization. */
|
||
outb(0x20, ioaddr + MISC_CTRL);
|
||
|
||
/* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
|
||
#ifdef old
|
||
memcpy((void*)dev->mem_start+0xfff6, init_words, 10);
|
||
#else
|
||
memcpy((void*)dev->mem_end-10, init_words, 10);
|
||
#endif
|
||
/* Write the words at 0x0000. */
|
||
memcpy((char*)dev->mem_start, init_words + 5, sizeof(init_words) - 10);
|
||
|
||
/* Fill in the station address. */
|
||
memcpy((char*)dev->mem_start+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 (shmem[iSCB_STATUS>>1] == 0)
|
||
if (--boguscnt == 0) {
|
||
printk("%s: i82586 initialization timed out with status %04x,"
|
||
"cmd %04x.\n", dev->name,
|
||
shmem[iSCB_STATUS>>1], shmem[iSCB_CMD>>1]);
|
||
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,
|
||
shmem[iSCB_STATUS>>1]);
|
||
return;
|
||
}
|
||
|
||
static void
|
||
hardware_send_packet(struct device *dev, void *buf, short length)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short ioaddr = dev->base_addr;
|
||
ushort tx_block = lp->tx_head;
|
||
ushort *write_ptr = (ushort *)(dev->mem_start + tx_block);
|
||
|
||
/* Set the write pointer to the Tx block, and put out the header. */
|
||
*write_ptr++ = 0x0000; /* Tx status */
|
||
*write_ptr++ = CMD_INTR|CmdTx; /* Tx command */
|
||
*write_ptr++ = tx_block+16; /* Next command is a NoOp. */
|
||
*write_ptr++ = tx_block+8; /* Data Buffer offset. */
|
||
|
||
/* Output the data buffer descriptor. */
|
||
*write_ptr++ = length | 0x8000; /* Byte count parameter. */
|
||
*write_ptr++ = -1; /* No next data buffer. */
|
||
*write_ptr++ = tx_block+22; /* Buffer follows the NoOp command. */
|
||
*write_ptr++ = 0x0000; /* Buffer address high bits (always zero). */
|
||
|
||
/* Output the Loop-back NoOp command. */
|
||
*write_ptr++ = 0x0000; /* Tx status */
|
||
*write_ptr++ = CmdNOp; /* Tx command */
|
||
*write_ptr++ = tx_block+16; /* Next is myself. */
|
||
|
||
/* Output the packet at the write pointer. */
|
||
memcpy(write_ptr, buf, length);
|
||
|
||
/* Set the old command link pointing to this send packet. */
|
||
*(ushort*)(dev->mem_start + lp->tx_cmd_link) = tx_block;
|
||
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);
|
||
}
|
||
|
||
if (lp->tx_head != lp->tx_reap)
|
||
dev->tbusy = 0;
|
||
}
|
||
|
||
static void
|
||
el16_rx(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short *shmem = (short*)dev->mem_start;
|
||
ushort rx_head = lp->rx_head;
|
||
ushort rx_tail = lp->rx_tail;
|
||
ushort boguscount = 10;
|
||
short frame_status;
|
||
|
||
while ((frame_status = shmem[rx_head>>1]) < 0) { /* Command complete */
|
||
ushort *read_frame = (short *)(dev->mem_start + rx_head);
|
||
ushort rfd_cmd = read_frame[1];
|
||
ushort next_rx_frame = read_frame[2];
|
||
ushort data_buffer_addr = read_frame[3];
|
||
ushort *data_frame = (short *)(dev->mem_start + data_buffer_addr);
|
||
ushort pkt_len = data_frame[0];
|
||
|
||
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. */
|
||
int sksize;
|
||
struct sk_buff *skb;
|
||
|
||
pkt_len &= 0x3fff;
|
||
sksize = sizeof(struct sk_buff) + pkt_len;
|
||
skb = alloc_skb(sksize, GFP_ATOMIC);
|
||
if (skb == NULL) {
|
||
printk("%s: Memory squeeze, dropping packet.\n", dev->name);
|
||
lp->stats.rx_dropped++;
|
||
break;
|
||
}
|
||
skb->mem_len = sksize;
|
||
skb->mem_addr = skb;
|
||
skb->len = pkt_len;
|
||
skb->dev = dev;
|
||
|
||
/* 'skb->data' points to the start of sk_buff data area. */
|
||
memcpy(skb->data, data_frame + 5, pkt_len);
|
||
|
||
#ifdef HAVE_NETIF_RX
|
||
netif_rx(skb);
|
||
#else
|
||
skb->lock = 0;
|
||
if (dev_rint((unsigned char*)skb, pkt_len, IN_SKBUFF, dev) != 0) {
|
||
kfree_skbmem(skb, sksize);
|
||
lp->stats.rx_dropped++;
|
||
break;
|
||
}
|
||
#endif
|
||
lp->stats.rx_packets++;
|
||
}
|
||
|
||
/* Clear the status word and set End-of-List on the rx frame. */
|
||
read_frame[0] = 0;
|
||
read_frame[1] = 0xC000;
|
||
/* Clear the end-of-list on the prev. RFD. */
|
||
*(short*)(dev->mem_start + rx_tail + 2) = 0x0000;
|
||
|
||
rx_tail = rx_head;
|
||
rx_head = next_rx_frame;
|
||
if (--boguscount == 0)
|
||
break;
|
||
}
|
||
|
||
lp->rx_head = rx_head;
|
||
lp->rx_tail = rx_tail;
|
||
}
|
||
|
||
/*
|
||
* 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
|
||
* End:
|
||
*/
|
||
|