1026 lines
32 KiB
C
1026 lines
32 KiB
C
/* eexpress.c: Intel EtherExpress 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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Things remaining to do:
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Check that the 586 and ASIC are reset/unreset at the right times.
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Check tx and rx buffer setup.
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The current Tx is single-buffer-only.
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Move the theory of operation and memory map documentation.
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Rework the board error reset
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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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"eexpress.c:v0.06 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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#else
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/* This isn't quite right, but it's the best version define I can find right now. */
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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 2
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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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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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short rx_head;
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short rx_tail;
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short tx_head;
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short tx_cmd_link;
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short tx_reap;
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};
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/*
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Details of the EtherExpress Implementation
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The EtherExpress takes an unusual approach to host access to packet buffer
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memory. The host can use either the Dataport, with independent
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autoincrementing read and write pointers, or it can I/O map 32 bytes of the
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memory using the "Shadow Memory Pointer" (SMB) as follows:
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ioaddr Normal EtherExpress registers
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ioaddr+0x4000...0x400f Buffer Memory at SMB...SMB+15
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ioaddr+0x8000...0x800f Buffer Memory at SMB+16...SMB+31
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ioaddr+0xC000...0xC007 "" SMB+16...SMB+23 (hardware flaw?)
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ioaddr+0xC008...0xC00f Buffer Memory at 0x0008...0x000f
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The last I/O map set is useful if you put the i82586 System Command Block
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(the command mailbox) exactly at 0x0008. (There seems to be some
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undocumented init structure at 0x0000-7, so I had to use the Crywnr memory
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setup verbatim for those four words anyway.)
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A problem with using either one of these mechanisms is that you must run
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single-threaded, or the interrupt handler must restore a changed value of
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the read, write, or SMB pointers.
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Unlike the Crynwr driver, my driver mostly ignores the I/O mapped "feature"
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and relies heavily on the dataport for buffer memory access. To minimize
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switching, the read_pointer is dedicated to the Rx interrupt handler, and
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the write_pointer is used by the send_packet() routine (it's carefully saved
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and restored when it's needed by the interrupt handler).
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*/
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/* Offsets from the base I/O address. */
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#define DATAPORT 0 /* Data Transfer Register. */
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#define WRITE_PTR 2 /* Write Address Pointer. */
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#define READ_PTR 4 /* Read Address Pointer. */
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#define SIGNAL_CA 6 /* Frob the 82586 Channel Attention line. */
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#define SET_IRQ 7 /* IRQ Select. */
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#define SHADOW_PTR 8 /* Shadow Memory Bank Pointer. */
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#define MEM_Ctrl 11
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#define MEM_Page_Ctrl 12
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#define Config 13
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#define EEPROM_Ctrl 14
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#define ID_PORT 15
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/* EEPROM_Ctrl bits. */
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#define EE_SHIFT_CLK 0x01 /* EEPROM shift clock. */
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#define EE_CS 0x02 /* EEPROM chip select. */
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#define EE_DATA_WRITE 0x04 /* EEPROM chip data in. */
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#define EE_DATA_READ 0x08 /* EEPROM chip data out. */
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#define EE_CTRL_BITS (EE_SHIFT_CLK | EE_CS | EE_DATA_WRITE | EE_DATA_READ)
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#define ASIC_RESET 0x40
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#define _586_RESET 0x80
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/* Offsets into the System Control Block structure. */
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#define SCB_STATUS 0xc008
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#define SCB_CMD 0xc00A
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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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#define SCB_CBL 0xc00C /* Command BLock offset. */
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#define SCB_RFA 0xc00E /* 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.
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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 (0x640) /* packet+header+RBD+extra */
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#define RX_BUF_END 0x8000
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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 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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#ifdef initial_text_tx
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0, CmdMulticastList, DUMP_DATA, 0,
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#else
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0, CmdMulticastList, IDLELOOP, 0,
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#endif
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/* 0x0056: A continuous transmit command, only here for testing. */
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0, CmdTx, DUMP_DATA, DUMP_DATA+8, 0x803ff, -1, DUMP_DATA, 0,
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};
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/* Index to functions, as function prototypes. */
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extern int express_probe(struct device *dev); /* Called from Space.c */
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static int eexp_probe1(struct device *dev, short ioaddr);
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static int eexp_open(struct device *dev);
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static int eexp_send_packet(struct sk_buff *skb, struct device *dev);
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static void eexp_interrupt(int reg_ptr);
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static void eexp_rx(struct device *dev);
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static int eexp_close(struct device *dev);
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static struct enet_statistics *eexp_get_stats(struct device *dev);
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#ifdef HAVE_MULTICAST
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static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
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#endif
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static int read_eeprom(int ioaddr, int location);
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static void hardware_send_packet(struct device *dev, void *buf, short length);
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static void init_82586_mem(struct device *dev);
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static void init_rx_bufs(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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express_probe(struct device *dev)
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{
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/* Don't probe all settable addresses, 0x[23][0-7]0, just common ones. */
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int *port, ports[] = {0x300, 0x270, 0x320, 0x340, 0};
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int base_addr = dev->base_addr;
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if (base_addr > 0x1ff) /* Check a single specified location. */
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return eexp_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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for (port = &ports[0]; *port; port++) {
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short id_addr = *port + ID_PORT;
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unsigned short sum = 0;
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int i;
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#ifdef notdef
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for (i = 16; i > 0; i--)
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sum += inb(id_addr);
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#else
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for (i = 4; i > 0; i--) {
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short id_val = inb(id_addr);
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sum |= (id_val >> 4) << ((id_val & 3) << 2);
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}
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#endif
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if (sum == 0xbaba
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&& eexp_probe1(dev, *port) == 0)
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return 0;
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}
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return ENODEV; /* ENODEV would be more accurate. */
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}
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int eexp_probe1(struct device *dev, short ioaddr)
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{
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unsigned short station_addr[3];
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int i;
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printk("%s: EtherExpress at %#x,", dev->name, ioaddr);
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/* The station address is stored !backwards! in the EEPROM, reverse
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after reading. (Hmmm, a little brain-damage there at Intel, eh?) */
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station_addr[0] = read_eeprom(ioaddr, 2);
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station_addr[1] = read_eeprom(ioaddr, 3);
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station_addr[2] = read_eeprom(ioaddr, 4);
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/* Check the first three octets of the S.A. for the manufactor's code. */
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if (station_addr[2] != 0x00aa || (station_addr[1] & 0xff00) != 0x0000) {
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printk(" rejected (invalid address %04x%04x%04x).\n",
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station_addr[2], station_addr[1], station_addr[0]);
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return ENODEV;
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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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for (i = 0; i < 6; i++) {
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dev->dev_addr[i] = ((unsigned char*)station_addr)[5-i];
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printk(" %02x", dev->dev_addr[i]);
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}
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/* There is no reason for the driver to care, but I print out the
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interface to minimize bogus bug reports. */
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{
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char irqmap[] = {0, 9, 3, 4, 5, 10, 11, 0};
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char *ifmap[] = {"AUI", "BNC", "10baseT"};
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enum iftype {AUI=0, BNC=1, TP=2};
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unsigned short setupval = read_eeprom(ioaddr, 0);
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dev->irq = irqmap[setupval >> 13];
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dev->if_port = (setupval & 0x1000) == 0 ? AUI :
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read_eeprom(ioaddr, 5) & 0x1 ? TP : BNC;
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printk(", IRQ %d, Interface %s.\n", dev->irq, ifmap[dev->if_port]);
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/* Release the IRQ line so that it can be shared if we don't use the
|
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ethercard. */
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outb(0x00, ioaddr + SET_IRQ);
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}
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/* It's now OK to leave the board in reset, pending the open(). */
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outb(ASIC_RESET, ioaddr + EEPROM_Ctrl);
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if ((dev->mem_start & 0xf) > 0)
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net_debug = dev->mem_start & 7;
|
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if (net_debug)
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printk(version);
|
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|
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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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|
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dev->open = eexp_open;
|
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dev->stop = eexp_close;
|
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dev->hard_start_xmit = eexp_send_packet;
|
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dev->get_stats = eexp_get_stats;
|
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#ifdef HAVE_MULTICAST
|
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dev->set_multicast_list = &set_multicast_list;
|
||
#endif
|
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|
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/* Fill in the fields of the device structure with ethernet-generic values.
|
||
This should be in a common file instead of per-driver. */
|
||
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;
|
||
dev->hard_header_len = ETH_HLEN;
|
||
dev->mtu = 1500; /* eth_mtu */
|
||
dev->addr_len = ETH_ALEN;
|
||
for (i = 0; i < ETH_ALEN; i++) {
|
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dev->broadcast[i]=0xff;
|
||
}
|
||
|
||
/* New-style flags. */
|
||
dev->flags = IFF_BROADCAST;
|
||
dev->family = AF_INET;
|
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dev->pa_addr = 0;
|
||
dev->pa_brdaddr = 0;
|
||
dev->pa_mask = 0;
|
||
dev->pa_alen = sizeof(unsigned long);
|
||
|
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return 0;
|
||
}
|
||
|
||
|
||
/* Reverse IRQ map: the value to put in the SET_IRQ reg. for IRQ<index>. */
|
||
static char irqrmap[]={0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0};
|
||
|
||
static int
|
||
eexp_open(struct device *dev)
|
||
{
|
||
int ioaddr = dev->base_addr;
|
||
|
||
if (dev->irq == 0 || irqrmap[dev->irq] == 0)
|
||
return -ENXIO;
|
||
|
||
if (irq2dev_map[dev->irq] != 0
|
||
/* This is always true, but avoid the false IRQ. */
|
||
|| (irq2dev_map[dev->irq] = dev) == 0
|
||
|| request_irq(dev->irq, &eexp_interrupt)) {
|
||
return -EAGAIN;
|
||
}
|
||
|
||
/* Initialize the 82586 memory and start it. */
|
||
init_82586_mem(dev);
|
||
|
||
/* Enable the interrupt line. */
|
||
outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
|
||
|
||
dev->tbusy = 0;
|
||
dev->interrupt = 0;
|
||
dev->start = 1;
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
eexp_send_packet(struct sk_buff *skb, struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
int ioaddr = dev->base_addr;
|
||
|
||
if (dev->tbusy) {
|
||
/* If we get here, some higher level has decided we are broken.
|
||
There should really be a "kick me" function call instead. */
|
||
int tickssofar = jiffies - dev->trans_start;
|
||
if (tickssofar < 5)
|
||
return 1;
|
||
if (net_debug > 1)
|
||
printk("%s: transmit timed out, %s? ", dev->name,
|
||
inw(ioaddr+SCB_STATUS) & 0x8000 ? "IRQ conflict" :
|
||
"network cable problem");
|
||
lp->stats.tx_errors++;
|
||
/* 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);
|
||
} else {
|
||
/* Issue the channel attention signal and hope it "gets better". */
|
||
if (net_debug > 1) printk("Kicking board.\n");
|
||
outw(0xf000|CUC_START|RX_START, ioaddr + SCB_CMD);
|
||
outb(0, ioaddr + SIGNAL_CA);
|
||
lp->last_restart = lp->stats.tx_packets;
|
||
}
|
||
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(irqrmap[dev->irq], ioaddr + SET_IRQ);
|
||
hardware_send_packet(dev, buf, length);
|
||
dev->trans_start = jiffies;
|
||
/* Enable the 82586 interrupt input. */
|
||
outb(0x08 | irqrmap[dev->irq], ioaddr + SET_IRQ);
|
||
}
|
||
|
||
if (skb->free)
|
||
kfree_skb (skb, FREE_WRITE);
|
||
|
||
/* You might need to clean up and record Tx statistics here. */
|
||
lp->stats.tx_aborted_errors++;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* The typical workload of the driver:
|
||
Handle the network interface interrupts. */
|
||
static void
|
||
eexp_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;
|
||
short ack_cmd = 0;
|
||
|
||
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;
|
||
|
||
status = inw(ioaddr + SCB_STATUS);
|
||
|
||
if (net_debug > 4) {
|
||
printk("%s: EExp interrupt, status %4.4x.\n", dev->name, status);
|
||
}
|
||
|
||
/* Disable the 82586's input to the interrupt line. */
|
||
outb(irqrmap[dev->irq], ioaddr + SET_IRQ);
|
||
|
||
/* Reap the Tx packet buffers. */
|
||
while (lp->tx_reap != lp->tx_head) { /* if (status & 0x8000) */
|
||
unsigned short tx_status;
|
||
outw(lp->tx_reap, ioaddr + READ_PTR);
|
||
tx_status = inw(ioaddr);
|
||
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);
|
||
eexp_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) {
|
||
short saved_write_ptr = inw(ioaddr + WRITE_PTR);
|
||
/* 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);
|
||
outw(RX_BUF_START, SCB_RFA);
|
||
outw(saved_write_ptr, ioaddr + WRITE_PTR);
|
||
ack_cmd |= RX_START;
|
||
}
|
||
|
||
outw(ack_cmd, ioaddr + SCB_CMD);
|
||
outb(0, ioaddr + SIGNAL_CA);
|
||
|
||
if (net_debug > 5) {
|
||
printk("%s: EExp exiting interrupt, status %4.4x.\n", dev->name,
|
||
inw(ioaddr + SCB_CMD));
|
||
}
|
||
/* Enable the 82586's input to the interrupt line. */
|
||
outb(irqrmap[dev->irq] | 0x08, ioaddr + SET_IRQ);
|
||
return;
|
||
}
|
||
|
||
static int
|
||
eexp_close(struct device *dev)
|
||
{
|
||
int ioaddr = dev->base_addr;
|
||
|
||
dev->tbusy = 1;
|
||
dev->start = 0;
|
||
|
||
/* Flush the Tx and disable Rx. */
|
||
outw(RX_SUSPEND | CUC_SUSPEND, ioaddr + SCB_CMD);
|
||
outb(0, ioaddr + SIGNAL_CA);
|
||
|
||
/* Disable the physical interrupt line. */
|
||
outb(0, ioaddr + SET_IRQ);
|
||
|
||
free_irq(dev->irq);
|
||
|
||
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 *
|
||
eexp_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;
|
||
}
|
||
|
||
#ifdef HAVE_MULTICAST
|
||
/* Set or clear the multicast filter for this adaptor.
|
||
num_addrs == -1 Promiscuous mode, receive all packets
|
||
num_addrs == 0 Normal mode, clear multicast list
|
||
num_addrs > 0 Multicast mode, receive normal and MC packets, and do
|
||
best-effort filtering.
|
||
*/
|
||
static void
|
||
set_multicast_list(struct device *dev, int num_addrs, void *addrs)
|
||
{
|
||
short ioaddr = dev->base_addr;
|
||
if (num_addrs < 0) {
|
||
/* Not written yet, this requires expanding the init_words config
|
||
cmd. */
|
||
} else if (num_addrs > 0) {
|
||
/* Fill in the SET_MC_CMD with the number of address bytes, followed
|
||
by the list of multicast addresses to be accepted. */
|
||
outw(SET_MC_CMD + 6, ioaddr + WRITE_PTR);
|
||
outw(num_addrs * 6, ioaddr);
|
||
outsw(ioaddr, addrs, num_addrs*3); /* 3 = addr len in words */
|
||
/* We must trigger a whole 586 reset due to a bug. */
|
||
} else {
|
||
/* Not written yet, this requires expanding the init_words config
|
||
cmd. */
|
||
outw(99, ioaddr); /* Disable promiscuous mode, use normal mode */
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* The horrible routine to read a word from the serial EEPROM. */
|
||
|
||
/* The delay between EEPROM clock transitions. */
|
||
#define eeprom_delay() { int _i = 40; while (--_i > 0) { __SLOW_DOWN_IO; }}
|
||
#define EE_READ_CMD (6 << 6)
|
||
|
||
int
|
||
read_eeprom(int ioaddr, int location)
|
||
{
|
||
int i;
|
||
unsigned short retval = 0;
|
||
short ee_addr = ioaddr + EEPROM_Ctrl;
|
||
int read_cmd = location | EE_READ_CMD;
|
||
short ctrl_val = EE_CS | _586_RESET;
|
||
|
||
outb(ctrl_val, ee_addr);
|
||
|
||
/* Shift the read command bits out. */
|
||
for (i = 8; i >= 0; i--) {
|
||
short outval = (read_cmd & (1 << i)) ? ctrl_val | EE_DATA_WRITE
|
||
: ctrl_val;
|
||
outb(outval, ee_addr);
|
||
outb(outval | EE_SHIFT_CLK, ee_addr); /* EEPROM clock tick. */
|
||
eeprom_delay();
|
||
outb(outval, ee_addr); /* Finish EEPROM a clock tick. */
|
||
eeprom_delay();
|
||
}
|
||
outb(ctrl_val, ee_addr);
|
||
|
||
for (i = 16; i > 0; i--) {
|
||
outb(ctrl_val | EE_SHIFT_CLK, ee_addr); eeprom_delay();
|
||
retval = (retval << 1) | ((inb(ee_addr) & EE_DATA_READ) ? 1 : 0);
|
||
outb(ctrl_val, ee_addr); eeprom_delay();
|
||
}
|
||
|
||
/* Terminate the EEPROM access. */
|
||
ctrl_val &= ~EE_CS;
|
||
outb(ctrl_val | EE_SHIFT_CLK, ee_addr);
|
||
eeprom_delay();
|
||
outb(ctrl_val, ee_addr);
|
||
eeprom_delay();
|
||
return retval;
|
||
}
|
||
|
||
static void
|
||
init_82586_mem(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short ioaddr = dev->base_addr;
|
||
|
||
/* Enable loopback to protect the wire while starting up.
|
||
This is Superstition From Crynwr. */
|
||
outb(inb(ioaddr + Config) | 0x02, ioaddr + Config);
|
||
|
||
/* Hold the 586 in reset during the memory initialization. */
|
||
outb(_586_RESET, ioaddr + EEPROM_Ctrl);
|
||
|
||
/* Place the write pointer at 0xfff6 (address-aliased to 0xfffff6). */
|
||
outw(0xfff6, ioaddr + WRITE_PTR);
|
||
outsw(ioaddr, init_words, sizeof(init_words)>>1);
|
||
|
||
/* Fill in the station address. */
|
||
outw(SA_OFFSET, ioaddr + WRITE_PTR);
|
||
outsw(ioaddr, dev->dev_addr, 3);
|
||
|
||
/* The Tx-block list is written as needed. We just set up the values. */
|
||
#ifdef initial_text_tx
|
||
lp->tx_cmd_link = DUMP_DATA + 4;
|
||
#else
|
||
lp->tx_cmd_link = IDLELOOP + 4;
|
||
#endif
|
||
lp->tx_head = lp->tx_reap = TX_BUF_START;
|
||
|
||
init_rx_bufs(dev);
|
||
|
||
/* Start the 586 by releasing the reset line. */
|
||
outb(0x00, ioaddr + EEPROM_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 (inw(ioaddr + SCB_STATUS) == 0)
|
||
if (--boguscnt == 0) {
|
||
printk("%s: i82586 initialization timed out with status %04x, cmd %04x.\n",
|
||
dev->name, inw(ioaddr + SCB_STATUS), inw(ioaddr + SCB_CMD));
|
||
break;
|
||
}
|
||
/* Issue channel-attn -- the 82586 won't start without it. */
|
||
outb(0, ioaddr + SIGNAL_CA);
|
||
}
|
||
|
||
/* Disable loopback. */
|
||
outb(inb(ioaddr + Config) & ~0x02, ioaddr + Config);
|
||
if (net_debug > 4)
|
||
printk("%s: Initialized 82586, status %04x.\n", dev->name,
|
||
inw(ioaddr + SCB_STATUS));
|
||
return;
|
||
}
|
||
|
||
/* Initialize the Rx-block list. */
|
||
static void
|
||
init_rx_bufs(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short ioaddr = dev->base_addr;
|
||
|
||
int cur_rxbuf = lp->rx_head = RX_BUF_START;
|
||
|
||
/* Initialize each Rx frame + data buffer. */
|
||
do { /* While there is room for one more. */
|
||
outw(cur_rxbuf, ioaddr + WRITE_PTR);
|
||
outw(0x0000, ioaddr); /* Status */
|
||
outw(0x0000, ioaddr); /* Command */
|
||
outw(cur_rxbuf + RX_BUF_SIZE, ioaddr); /* Link */
|
||
outw(cur_rxbuf + 22, ioaddr); /* Buffer offset */
|
||
outw(0x0000, ioaddr); /* Pad for dest addr. */
|
||
outw(0x0000, ioaddr);
|
||
outw(0x0000, ioaddr);
|
||
outw(0x0000, ioaddr); /* Pad for source addr. */
|
||
outw(0x0000, ioaddr);
|
||
outw(0x0000, ioaddr);
|
||
outw(0x0000, ioaddr); /* Pad for protocol. */
|
||
|
||
outw(0x0000, ioaddr); /* Buffer: Actual count */
|
||
outw(-1, ioaddr); /* Buffer: Next (none). */
|
||
outw(cur_rxbuf + 0x20, ioaddr); /* Buffer: Address low */
|
||
outw(0x0000, ioaddr);
|
||
/* Finally, the number of bytes in the buffer. */
|
||
outw(0x8000 + RX_BUF_SIZE-0x20, ioaddr);
|
||
|
||
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. */
|
||
outw(lp->rx_tail + 2, ioaddr + WRITE_PTR);
|
||
outw(0xC000, ioaddr); /* Command, mark as last. */
|
||
outw(lp->rx_head, ioaddr); /* Link */
|
||
}
|
||
|
||
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;
|
||
short tx_block = lp->tx_head;
|
||
|
||
/* Set the write pointer to the Tx block, and put out the header. */
|
||
outw(tx_block, ioaddr + WRITE_PTR);
|
||
outw(0x0000, ioaddr); /* Tx status */
|
||
outw(CMD_INTR|CmdTx, ioaddr); /* Tx command */
|
||
outw(tx_block+16, ioaddr); /* Next command is a NoOp. */
|
||
outw(tx_block+8, ioaddr); /* Data Buffer offset. */
|
||
|
||
/* Output the data buffer descriptor. */
|
||
outw(length | 0x8000, ioaddr); /* Byte count parameter. */
|
||
outw(-1, ioaddr); /* No next data buffer. */
|
||
outw(tx_block+22, ioaddr); /* Buffer follows the NoOp command. */
|
||
outw(0x0000, ioaddr); /* Buffer address high bits (always zero). */
|
||
|
||
/* Output the Loop-back NoOp command. */
|
||
outw(0x0000, ioaddr); /* Tx status */
|
||
outw(CmdNOp, ioaddr); /* Tx command */
|
||
outw(tx_block+16, ioaddr); /* Next is myself. */
|
||
|
||
/* Output the packet using the write pointer.
|
||
Hmmm, it feels a little like a 3c501! */
|
||
outsw(ioaddr + DATAPORT, buf, (length + 1) >> 1);
|
||
|
||
/* Set the old command link pointing to this send packet. */
|
||
outw(lp->tx_cmd_link, ioaddr + WRITE_PTR);
|
||
outw(tx_block, ioaddr);
|
||
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: EExp @%x send length = %d, tx_block %3x, next %3x, "
|
||
"reap %4x status %4.4x.\n", dev->name, ioaddr, length,
|
||
tx_block, lp->tx_head, lp->tx_reap, inw(ioaddr + SCB_STATUS));
|
||
}
|
||
|
||
if (lp->tx_head != lp->tx_reap)
|
||
dev->tbusy = 0;
|
||
}
|
||
|
||
static void
|
||
eexp_rx(struct device *dev)
|
||
{
|
||
struct net_local *lp = (struct net_local *)dev->priv;
|
||
short ioaddr = dev->base_addr;
|
||
short saved_write_ptr = inw(ioaddr + WRITE_PTR);
|
||
short rx_head = lp->rx_head;
|
||
short rx_tail = lp->rx_tail;
|
||
short boguscount = 10;
|
||
short frame_status;
|
||
|
||
/* Set the read pointer to the Rx frame. */
|
||
outw(rx_head, ioaddr + READ_PTR);
|
||
while ((frame_status = inw(ioaddr)) < 0) { /* Command complete */
|
||
short rfd_cmd = inw(ioaddr);
|
||
short next_rx_frame = inw(ioaddr);
|
||
short data_buffer_addr = inw(ioaddr);
|
||
short pkt_len;
|
||
|
||
/* Set the read pointer the data buffer. */
|
||
outw(data_buffer_addr, ioaddr + READ_PTR);
|
||
pkt_len = inw(ioaddr);
|
||
|
||
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;
|
||
|
||
outw(data_buffer_addr + 10, ioaddr + READ_PTR);
|
||
|
||
insw(ioaddr, skb->data, (pkt_len + 1) >> 1);
|
||
|
||
#ifdef HAVE_NETIF_RX
|
||
netif_rx(skb);
|
||
#else
|
||
skb->lock = 0;
|
||
if (dev_rint((unsigned char*)skb, pkt_len, IN_SKBUFF, dev) != 0) {
|
||
kfree_s(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. */
|
||
outw(rx_head, ioaddr + WRITE_PTR);
|
||
outw(0x0000, ioaddr);
|
||
outw(0xC000, ioaddr);
|
||
#ifndef final_version
|
||
if (next_rx_frame != rx_head + RX_BUF_SIZE
|
||
&& next_rx_frame != RX_BUF_START) {
|
||
printk("%s: Rx next frame at %#x is %#x instead of %#x.\n", dev->name,
|
||
rx_head, next_rx_frame, rx_head + RX_BUF_SIZE);
|
||
next_rx_frame = rx_head + RX_BUF_SIZE;
|
||
if (next_rx_frame >= RX_BUF_END - RX_BUF_SIZE)
|
||
next_rx_frame = RX_BUF_START;
|
||
}
|
||
#endif
|
||
outw(rx_tail+2, ioaddr + WRITE_PTR);
|
||
outw(0x0000, ioaddr); /* Clear the end-of-list on the prev. RFD. */
|
||
|
||
#ifndef final_version
|
||
outw(rx_tail+4, ioaddr + READ_PTR);
|
||
if (inw(ioaddr) != rx_head) {
|
||
printk("%s: Rx buf link mismatch, at %04x link %04x instead of %04x.\n",
|
||
dev->name, rx_tail, (outw(rx_tail+4, ioaddr + READ_PTR),inw(ioaddr)),
|
||
rx_head);
|
||
outw(rx_head, ioaddr);
|
||
}
|
||
#endif
|
||
|
||
rx_tail = rx_head;
|
||
rx_head = next_rx_frame;
|
||
if (--boguscount == 0)
|
||
break;
|
||
outw(rx_head, ioaddr + READ_PTR);
|
||
}
|
||
|
||
lp->rx_head = rx_head;
|
||
lp->rx_tail = rx_tail;
|
||
|
||
/* Restore the original write pointer. */
|
||
outw(saved_write_ptr, ioaddr + WRITE_PTR);
|
||
}
|
||
|
||
/*
|
||
* 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 eexpress.c"
|
||
* version-control: t
|
||
* kept-new-versions: 5
|
||
* tab-width: 4
|
||
* End:
|
||
*/
|