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Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
952 lines
30 KiB
C
952 lines
30 KiB
C
/* atp.c: Attached (pocket) ethernet adapter driver for linux. */
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/*
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This is a driver for commonly OEM pocket (parallel port)
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ethernet adapters based on the Realtek RTL8002 and RTL8012 chips.
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Written 1993-2000 by Donald Becker.
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This software may be used and distributed according to the terms of
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the GNU General Public License (GPL), incorporated herein by reference.
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Drivers based on or derived from this code fall under the GPL and must
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retain the authorship, copyright and license notice. This file is not
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a complete program and may only be used when the entire operating
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system is licensed under the GPL.
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Copyright 1993 United States Government as represented by the Director,
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National Security Agency. Copyright 1994-2000 retained by the original
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author, Donald Becker. The timer-based reset code was supplied in 1995
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by Bill Carlson, wwc@super.org.
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The author may be reached as becker@scyld.com, or C/O
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Scyld Computing Corporation
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410 Severn Ave., Suite 210
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Annapolis MD 21403
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Support information and updates available at
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http://www.scyld.com/network/atp.html
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Modular support/softnet added by Alan Cox.
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_bit abuse fixed up by Alan Cox
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*/
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static const char versionA[] =
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"atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n";
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static const char versionB[] =
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" http://www.scyld.com/network/atp.html\n";
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/* The user-configurable values.
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These may be modified when a driver module is loaded.*/
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static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
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#define net_debug debug
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/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
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static int max_interrupt_work = 15;
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#define NUM_UNITS 2
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/* The standard set of ISA module parameters. */
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static int io[NUM_UNITS];
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static int irq[NUM_UNITS];
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static int xcvr[NUM_UNITS]; /* The data transfer mode. */
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/* Operational parameters that are set at compile time. */
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/* Time in jiffies before concluding the transmitter is hung. */
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#define TX_TIMEOUT (400*HZ/1000)
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/*
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This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
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ethernet adapter. This is a common low-cost OEM pocket ethernet
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adapter, sold under many names.
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Sources:
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This driver was written from the packet driver assembly code provided by
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Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated
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device works just from the assembly code? It ain't pretty. The following
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description is written based on guesses and writing lots of special-purpose
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code to test my theorized operation.
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In 1997 Realtek made available the documentation for the second generation
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RTL8012 chip, which has lead to several driver improvements.
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http://www.realtek.com.tw/cn/cn.html
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Theory of Operation
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The RTL8002 adapter seems to be built around a custom spin of the SEEQ
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controller core. It probably has a 16K or 64K internal packet buffer, of
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which the first 4K is devoted to transmit and the rest to receive.
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The controller maintains the queue of received packet and the packet buffer
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access pointer internally, with only 'reset to beginning' and 'skip to next
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packet' commands visible. The transmit packet queue holds two (or more?)
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packets: both 'retransmit this packet' (due to collision) and 'transmit next
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packet' commands must be started by hand.
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The station address is stored in a standard bit-serial EEPROM which must be
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read (ughh) by the device driver. (Provisions have been made for
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substituting a 74S288 PROM, but I haven't gotten reports of any models
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using it.) Unlike built-in devices, a pocket adapter can temporarily lose
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power without indication to the device driver. The major effect is that
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the station address, receive filter (promiscuous, etc.) and transceiver
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must be reset.
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The controller itself has 16 registers, some of which use only the lower
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bits. The registers are read and written 4 bits at a time. The four bit
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register address is presented on the data lines along with a few additional
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timing and control bits. The data is then read from status port or written
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to the data port.
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Correction: the controller has two banks of 16 registers. The second
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bank contains only the multicast filter table (now used) and the EEPROM
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access registers.
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Since the bulk data transfer of the actual packets through the slow
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parallel port dominates the driver's running time, four distinct data
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(non-register) transfer modes are provided by the adapter, two in each
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direction. In the first mode timing for the nibble transfers is
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provided through the data port. In the second mode the same timing is
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provided through the control port. In either case the data is read from
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the status port and written to the data port, just as it is accessing
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registers.
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In addition to the basic data transfer methods, several more are modes are
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created by adding some delay by doing multiple reads of the data to allow
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it to stabilize. This delay seems to be needed on most machines.
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The data transfer mode is stored in the 'dev->if_port' field. Its default
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value is '4'. It may be overridden at boot-time using the third parameter
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to the "ether=..." initialization.
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The header file <atp.h> provides inline functions that encapsulate the
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register and data access methods. These functions are hand-tuned to
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generate reasonable object code. This header file also documents my
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interpretations of the device registers.
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*/
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#include <linux/kernel.h>
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#include <linux/module.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/ioport.h>
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#include <linux/in.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/crc32.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include "atp.h"
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MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
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MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver");
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MODULE_LICENSE("GPL");
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module_param(max_interrupt_work, int, 0);
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module_param(debug, int, 0);
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module_param_array(io, int, NULL, 0);
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module_param_array(irq, int, NULL, 0);
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module_param_array(xcvr, int, NULL, 0);
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MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt");
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MODULE_PARM_DESC(debug, "ATP debug level (0-7)");
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MODULE_PARM_DESC(io, "ATP I/O base address(es)");
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MODULE_PARM_DESC(irq, "ATP IRQ number(s)");
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MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)");
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/* The number of low I/O ports used by the ethercard. */
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#define ETHERCARD_TOTAL_SIZE 3
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/* Sequence to switch an 8012 from printer mux to ethernet mode. */
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static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,};
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struct net_local {
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spinlock_t lock;
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struct net_device *next_module;
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struct net_device_stats stats;
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struct timer_list timer; /* Media selection timer. */
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long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */
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int saved_tx_size;
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unsigned int tx_unit_busy:1;
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unsigned char re_tx, /* Number of packet retransmissions. */
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addr_mode, /* Current Rx filter e.g. promiscuous, etc. */
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pac_cnt_in_tx_buf,
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chip_type;
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};
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/* This code, written by wwc@super.org, resets the adapter every
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TIMED_CHECKER ticks. This recovers from an unknown error which
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hangs the device. */
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#define TIMED_CHECKER (HZ/4)
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#ifdef TIMED_CHECKER
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#include <linux/timer.h>
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static void atp_timed_checker(unsigned long ignored);
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#endif
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/* Index to functions, as function prototypes. */
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static int atp_probe1(long ioaddr);
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static void get_node_ID(struct net_device *dev);
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static unsigned short eeprom_op(long ioaddr, unsigned int cmd);
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static int net_open(struct net_device *dev);
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static void hardware_init(struct net_device *dev);
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static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode);
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static void trigger_send(long ioaddr, int length);
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static int atp_send_packet(struct sk_buff *skb, struct net_device *dev);
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static irqreturn_t atp_interrupt(int irq, void *dev_id, struct pt_regs *regs);
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static void net_rx(struct net_device *dev);
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static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode);
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static int net_close(struct net_device *dev);
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static struct net_device_stats *net_get_stats(struct net_device *dev);
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static void set_rx_mode_8002(struct net_device *dev);
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static void set_rx_mode_8012(struct net_device *dev);
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static void tx_timeout(struct net_device *dev);
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/* A list of all installed ATP devices, for removing the driver module. */
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static struct net_device *root_atp_dev;
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/* Check for a network adapter 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, allocate space for the device and return success
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(detachable devices only).
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FIXME: we should use the parport layer for this
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*/
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static int __init atp_init(void)
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{
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int *port, ports[] = {0x378, 0x278, 0x3bc, 0};
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int base_addr = io[0];
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if (base_addr > 0x1ff) /* Check a single specified location. */
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return atp_probe1(base_addr);
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else if (base_addr == 1) /* Don't probe at all. */
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return -ENXIO;
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for (port = ports; *port; port++) {
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long ioaddr = *port;
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outb(0x57, ioaddr + PAR_DATA);
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if (inb(ioaddr + PAR_DATA) != 0x57)
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continue;
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if (atp_probe1(ioaddr) == 0)
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return 0;
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}
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return -ENODEV;
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}
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static int __init atp_probe1(long ioaddr)
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{
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struct net_device *dev = NULL;
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struct net_local *lp;
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int saved_ctrl_reg, status, i;
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int res;
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outb(0xff, ioaddr + PAR_DATA);
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/* Save the original value of the Control register, in case we guessed
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wrong. */
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saved_ctrl_reg = inb(ioaddr + PAR_CONTROL);
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if (net_debug > 3)
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printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg);
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/* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */
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outb(0x04, ioaddr + PAR_CONTROL);
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#ifndef final_version
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if (net_debug > 3) {
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/* Turn off the printer multiplexer on the 8012. */
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for (i = 0; i < 8; i++)
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outb(mux_8012[i], ioaddr + PAR_DATA);
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write_reg(ioaddr, MODSEL, 0x00);
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printk("atp: Registers are ");
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for (i = 0; i < 32; i++)
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printk(" %2.2x", read_nibble(ioaddr, i));
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printk(".\n");
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}
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#endif
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/* Turn off the printer multiplexer on the 8012. */
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for (i = 0; i < 8; i++)
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outb(mux_8012[i], ioaddr + PAR_DATA);
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write_reg_high(ioaddr, CMR1, CMR1h_RESET);
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/* udelay() here? */
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status = read_nibble(ioaddr, CMR1);
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if (net_debug > 3) {
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printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status);
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for (i = 0; i < 32; i++)
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printk(" %2.2x", read_nibble(ioaddr, i));
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printk("\n");
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}
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if ((status & 0x78) != 0x08) {
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/* The pocket adapter probe failed, restore the control register. */
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outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
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return -ENODEV;
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}
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status = read_nibble(ioaddr, CMR2_h);
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if ((status & 0x78) != 0x10) {
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outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
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return -ENODEV;
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}
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dev = alloc_etherdev(sizeof(struct net_local));
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if (!dev)
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return -ENOMEM;
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SET_MODULE_OWNER(dev);
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/* Find the IRQ used by triggering an interrupt. */
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write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */
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write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */
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/* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */
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if (irq[0])
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dev->irq = irq[0];
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else if (ioaddr == 0x378)
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dev->irq = 7;
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else
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dev->irq = 5;
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write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */
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write_reg(ioaddr, CMR2, CMR2_NULL);
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dev->base_addr = ioaddr;
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/* Read the station address PROM. */
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get_node_ID(dev);
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#ifndef MODULE
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if (net_debug)
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printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
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#endif
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printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, SAPROM "
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"%02X:%02X:%02X:%02X:%02X:%02X.\n", dev->name, dev->base_addr,
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dev->irq, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
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dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
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/* Reset the ethernet hardware and activate the printer pass-through. */
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write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
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lp = netdev_priv(dev);
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lp->chip_type = RTL8002;
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lp->addr_mode = CMR2h_Normal;
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spin_lock_init(&lp->lock);
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/* For the ATP adapter the "if_port" is really the data transfer mode. */
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if (xcvr[0])
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dev->if_port = xcvr[0];
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else
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dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4;
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if (dev->mem_end & 0xf)
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net_debug = dev->mem_end & 7;
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dev->open = net_open;
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dev->stop = net_close;
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dev->hard_start_xmit = atp_send_packet;
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dev->get_stats = net_get_stats;
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dev->set_multicast_list =
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lp->chip_type == RTL8002 ? &set_rx_mode_8002 : &set_rx_mode_8012;
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dev->tx_timeout = tx_timeout;
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dev->watchdog_timeo = TX_TIMEOUT;
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res = register_netdev(dev);
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if (res) {
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free_netdev(dev);
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return res;
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}
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lp->next_module = root_atp_dev;
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root_atp_dev = dev;
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return 0;
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}
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/* Read the station address PROM, usually a word-wide EEPROM. */
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static void __init get_node_ID(struct net_device *dev)
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{
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long ioaddr = dev->base_addr;
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int sa_offset = 0;
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int i;
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write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */
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/* Some adapters have the station address at offset 15 instead of offset
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zero. Check for it, and fix it if needed. */
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if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff)
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sa_offset = 15;
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for (i = 0; i < 3; i++)
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((u16 *)dev->dev_addr)[i] =
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be16_to_cpu(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
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write_reg(ioaddr, CMR2, CMR2_NULL);
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}
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/*
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An EEPROM read command starts by shifting out 0x60+address, and then
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shifting in the serial data. See the NatSemi databook for details.
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* ________________
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* CS : __|
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* ___ ___
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* CLK: ______| |___| |
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* __ _______ _______
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* DI : __X_______X_______X
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* DO : _________X_______X
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*/
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static unsigned short __init eeprom_op(long ioaddr, u32 cmd)
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{
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unsigned eedata_out = 0;
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int num_bits = EE_CMD_SIZE;
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while (--num_bits >= 0) {
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char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0;
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write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW);
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write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH);
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eedata_out <<= 1;
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if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ)
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eedata_out++;
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}
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write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS);
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return eedata_out;
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}
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/* Open/initialize the board. This is called (in the current kernel)
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sometime after booting when the 'ifconfig' program is run.
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This routine sets everything up anew at each open, even
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registers that "should" only need to be set once at boot, so that
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there is non-reboot way to recover if something goes wrong.
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This is an attachable device: if there is no dev->priv entry then it wasn't
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probed for at boot-time, and we need to probe for it again.
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*/
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static int net_open(struct net_device *dev)
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{
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struct net_local *lp = netdev_priv(dev);
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int ret;
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/* The interrupt line is turned off (tri-stated) when the device isn't in
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use. That's especially important for "attached" interfaces where the
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port or interrupt may be shared. */
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ret = request_irq(dev->irq, &atp_interrupt, 0, dev->name, dev);
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if (ret)
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return ret;
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hardware_init(dev);
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init_timer(&lp->timer);
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lp->timer.expires = jiffies + TIMED_CHECKER;
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lp->timer.data = (unsigned long)dev;
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lp->timer.function = &atp_timed_checker; /* timer handler */
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add_timer(&lp->timer);
|
|
|
|
netif_start_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* This routine resets the hardware. We initialize everything, assuming that
|
|
the hardware may have been temporarily detached. */
|
|
static void hardware_init(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
int i;
|
|
|
|
/* Turn off the printer multiplexer on the 8012. */
|
|
for (i = 0; i < 8; i++)
|
|
outb(mux_8012[i], ioaddr + PAR_DATA);
|
|
write_reg_high(ioaddr, CMR1, CMR1h_RESET);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
|
|
|
|
write_reg_high(ioaddr, CMR2, lp->addr_mode);
|
|
|
|
if (net_debug > 2) {
|
|
printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name,
|
|
(read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f);
|
|
}
|
|
|
|
write_reg(ioaddr, CMR2, CMR2_IRQOUT);
|
|
write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
|
|
|
|
/* Enable the interrupt line from the serial port. */
|
|
outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
|
|
|
|
/* Unmask the interesting interrupts. */
|
|
write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
|
|
write_reg_high(ioaddr, IMR, ISRh_RxErr);
|
|
|
|
lp->tx_unit_busy = 0;
|
|
lp->pac_cnt_in_tx_buf = 0;
|
|
lp->saved_tx_size = 0;
|
|
}
|
|
|
|
static void trigger_send(long ioaddr, int length)
|
|
{
|
|
write_reg_byte(ioaddr, TxCNT0, length & 0xff);
|
|
write_reg(ioaddr, TxCNT1, length >> 8);
|
|
write_reg(ioaddr, CMR1, CMR1_Xmit);
|
|
}
|
|
|
|
static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode)
|
|
{
|
|
if (length & 1)
|
|
{
|
|
length++;
|
|
pad_len++;
|
|
}
|
|
|
|
outb(EOC+MAR, ioaddr + PAR_DATA);
|
|
if ((data_mode & 1) == 0) {
|
|
/* Write the packet out, starting with the write addr. */
|
|
outb(WrAddr+MAR, ioaddr + PAR_DATA);
|
|
do {
|
|
write_byte_mode0(ioaddr, *packet++);
|
|
} while (--length > pad_len) ;
|
|
do {
|
|
write_byte_mode0(ioaddr, 0);
|
|
} while (--length > 0) ;
|
|
} else {
|
|
/* Write the packet out in slow mode. */
|
|
unsigned char outbyte = *packet++;
|
|
|
|
outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
|
|
outb(WrAddr+MAR, ioaddr + PAR_DATA);
|
|
|
|
outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA);
|
|
outb(outbyte & 0x0f, ioaddr + PAR_DATA);
|
|
outbyte >>= 4;
|
|
outb(outbyte & 0x0f, ioaddr + PAR_DATA);
|
|
outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
|
|
while (--length > pad_len)
|
|
write_byte_mode1(ioaddr, *packet++);
|
|
while (--length > 0)
|
|
write_byte_mode1(ioaddr, 0);
|
|
}
|
|
/* Terminate the Tx frame. End of write: ECB. */
|
|
outb(0xff, ioaddr + PAR_DATA);
|
|
outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL);
|
|
}
|
|
|
|
static void tx_timeout(struct net_device *dev)
|
|
{
|
|
struct net_local *np = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
|
|
printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name,
|
|
inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem"
|
|
: "IRQ conflict");
|
|
np->stats.tx_errors++;
|
|
/* Try to restart the adapter. */
|
|
hardware_init(dev);
|
|
dev->trans_start = jiffies;
|
|
netif_wake_queue(dev);
|
|
np->stats.tx_errors++;
|
|
}
|
|
|
|
static int atp_send_packet(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
int length;
|
|
unsigned long flags;
|
|
|
|
length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
/* Disable interrupts by writing 0x00 to the Interrupt Mask Register.
|
|
This sequence must not be interrupted by an incoming packet. */
|
|
|
|
spin_lock_irqsave(&lp->lock, flags);
|
|
write_reg(ioaddr, IMR, 0);
|
|
write_reg_high(ioaddr, IMR, 0);
|
|
spin_unlock_irqrestore(&lp->lock, flags);
|
|
|
|
write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port);
|
|
|
|
lp->pac_cnt_in_tx_buf++;
|
|
if (lp->tx_unit_busy == 0) {
|
|
trigger_send(ioaddr, length);
|
|
lp->saved_tx_size = 0; /* Redundant */
|
|
lp->re_tx = 0;
|
|
lp->tx_unit_busy = 1;
|
|
} else
|
|
lp->saved_tx_size = length;
|
|
/* Re-enable the LPT interrupts. */
|
|
write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
|
|
write_reg_high(ioaddr, IMR, ISRh_RxErr);
|
|
|
|
dev->trans_start = jiffies;
|
|
dev_kfree_skb (skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* The typical workload of the driver:
|
|
Handle the network interface interrupts. */
|
|
static irqreturn_t
|
|
atp_interrupt(int irq, void *dev_instance, struct pt_regs * regs)
|
|
{
|
|
struct net_device *dev = (struct net_device *)dev_instance;
|
|
struct net_local *lp;
|
|
long ioaddr;
|
|
static int num_tx_since_rx;
|
|
int boguscount = max_interrupt_work;
|
|
int handled = 0;
|
|
|
|
if (dev == NULL) {
|
|
printk(KERN_ERR "ATP_interrupt(): irq %d for unknown device.\n", irq);
|
|
return IRQ_NONE;
|
|
}
|
|
ioaddr = dev->base_addr;
|
|
lp = netdev_priv(dev);
|
|
|
|
spin_lock(&lp->lock);
|
|
|
|
/* Disable additional spurious interrupts. */
|
|
outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
|
|
|
|
/* The adapter's output is currently the IRQ line, switch it to data. */
|
|
write_reg(ioaddr, CMR2, CMR2_NULL);
|
|
write_reg(ioaddr, IMR, 0);
|
|
|
|
if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name);
|
|
while (--boguscount > 0) {
|
|
int status = read_nibble(ioaddr, ISR);
|
|
if (net_debug > 5) printk("loop status %02x..", status);
|
|
|
|
if (status & (ISR_RxOK<<3)) {
|
|
handled = 1;
|
|
write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */
|
|
do {
|
|
int read_status = read_nibble(ioaddr, CMR1);
|
|
if (net_debug > 6)
|
|
printk("handling Rx packet %02x..", read_status);
|
|
/* We acknowledged the normal Rx interrupt, so if the interrupt
|
|
is still outstanding we must have a Rx error. */
|
|
if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */
|
|
lp->stats.rx_over_errors++;
|
|
/* Set to no-accept mode long enough to remove a packet. */
|
|
write_reg_high(ioaddr, CMR2, CMR2h_OFF);
|
|
net_rx(dev);
|
|
/* Clear the interrupt and return to normal Rx mode. */
|
|
write_reg_high(ioaddr, ISR, ISRh_RxErr);
|
|
write_reg_high(ioaddr, CMR2, lp->addr_mode);
|
|
} else if ((read_status & (CMR1_BufEnb << 3)) == 0) {
|
|
net_rx(dev);
|
|
num_tx_since_rx = 0;
|
|
} else
|
|
break;
|
|
} while (--boguscount > 0);
|
|
} else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) {
|
|
handled = 1;
|
|
if (net_debug > 6) printk("handling Tx done..");
|
|
/* Clear the Tx interrupt. We should check for too many failures
|
|
and reinitialize the adapter. */
|
|
write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK);
|
|
if (status & (ISR_TxErr<<3)) {
|
|
lp->stats.collisions++;
|
|
if (++lp->re_tx > 15) {
|
|
lp->stats.tx_aborted_errors++;
|
|
hardware_init(dev);
|
|
break;
|
|
}
|
|
/* Attempt to retransmit. */
|
|
if (net_debug > 6) printk("attempting to ReTx");
|
|
write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit);
|
|
} else {
|
|
/* Finish up the transmit. */
|
|
lp->stats.tx_packets++;
|
|
lp->pac_cnt_in_tx_buf--;
|
|
if ( lp->saved_tx_size) {
|
|
trigger_send(ioaddr, lp->saved_tx_size);
|
|
lp->saved_tx_size = 0;
|
|
lp->re_tx = 0;
|
|
} else
|
|
lp->tx_unit_busy = 0;
|
|
netif_wake_queue(dev); /* Inform upper layers. */
|
|
}
|
|
num_tx_since_rx++;
|
|
} else if (num_tx_since_rx > 8
|
|
&& time_after(jiffies, dev->last_rx + HZ)) {
|
|
if (net_debug > 2)
|
|
printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
|
|
"%ld jiffies status %02x CMR1 %02x.\n", dev->name,
|
|
num_tx_since_rx, jiffies - dev->last_rx, status,
|
|
(read_nibble(ioaddr, CMR1) >> 3) & 15);
|
|
lp->stats.rx_missed_errors++;
|
|
hardware_init(dev);
|
|
num_tx_since_rx = 0;
|
|
break;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
/* This following code fixes a rare (and very difficult to track down)
|
|
problem where the adapter forgets its ethernet address. */
|
|
{
|
|
int i;
|
|
for (i = 0; i < 6; i++)
|
|
write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
|
|
#if 0 && defined(TIMED_CHECKER)
|
|
mod_timer(&lp->timer, jiffies + TIMED_CHECKER);
|
|
#endif
|
|
}
|
|
|
|
/* Tell the adapter that it can go back to using the output line as IRQ. */
|
|
write_reg(ioaddr, CMR2, CMR2_IRQOUT);
|
|
/* Enable the physical interrupt line, which is sure to be low until.. */
|
|
outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL);
|
|
/* .. we enable the interrupt sources. */
|
|
write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK);
|
|
write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */
|
|
|
|
spin_unlock(&lp->lock);
|
|
|
|
if (net_debug > 5) printk("exiting interrupt.\n");
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
#ifdef TIMED_CHECKER
|
|
/* This following code fixes a rare (and very difficult to track down)
|
|
problem where the adapter forgets its ethernet address. */
|
|
static void atp_timed_checker(unsigned long data)
|
|
{
|
|
struct net_device *dev = (struct net_device *)data;
|
|
long ioaddr = dev->base_addr;
|
|
struct net_local *lp = netdev_priv(dev);
|
|
int tickssofar = jiffies - lp->last_rx_time;
|
|
int i;
|
|
|
|
spin_lock(&lp->lock);
|
|
if (tickssofar > 2*HZ) {
|
|
#if 1
|
|
for (i = 0; i < 6; i++)
|
|
write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]);
|
|
lp->last_rx_time = jiffies;
|
|
#else
|
|
for (i = 0; i < 6; i++)
|
|
if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i])
|
|
{
|
|
struct net_local *lp = netdev_priv(atp_timed_dev);
|
|
write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]);
|
|
if (i == 2)
|
|
lp->stats.tx_errors++;
|
|
else if (i == 3)
|
|
lp->stats.tx_dropped++;
|
|
else if (i == 4)
|
|
lp->stats.collisions++;
|
|
else
|
|
lp->stats.rx_errors++;
|
|
}
|
|
#endif
|
|
}
|
|
spin_unlock(&lp->lock);
|
|
lp->timer.expires = jiffies + TIMED_CHECKER;
|
|
add_timer(&lp->timer);
|
|
}
|
|
#endif
|
|
|
|
/* We have a good packet(s), get it/them out of the buffers. */
|
|
static void net_rx(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
struct rx_header rx_head;
|
|
|
|
/* Process the received packet. */
|
|
outb(EOC+MAR, ioaddr + PAR_DATA);
|
|
read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port);
|
|
if (net_debug > 5)
|
|
printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad,
|
|
rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr);
|
|
if ((rx_head.rx_status & 0x77) != 0x01) {
|
|
lp->stats.rx_errors++;
|
|
if (rx_head.rx_status & 0x0004) lp->stats.rx_frame_errors++;
|
|
else if (rx_head.rx_status & 0x0002) lp->stats.rx_crc_errors++;
|
|
if (net_debug > 3)
|
|
printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n",
|
|
dev->name, rx_head.rx_status);
|
|
if (rx_head.rx_status & 0x0020) {
|
|
lp->stats.rx_fifo_errors++;
|
|
write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE);
|
|
write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE);
|
|
} else if (rx_head.rx_status & 0x0050)
|
|
hardware_init(dev);
|
|
return;
|
|
} else {
|
|
/* Malloc up new buffer. The "-4" omits the FCS (CRC). */
|
|
int pkt_len = (rx_head.rx_count & 0x7ff) - 4;
|
|
struct sk_buff *skb;
|
|
|
|
skb = dev_alloc_skb(pkt_len + 2);
|
|
if (skb == NULL) {
|
|
printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n",
|
|
dev->name);
|
|
lp->stats.rx_dropped++;
|
|
goto done;
|
|
}
|
|
skb->dev = dev;
|
|
|
|
skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */
|
|
read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
netif_rx(skb);
|
|
dev->last_rx = jiffies;
|
|
lp->stats.rx_packets++;
|
|
lp->stats.rx_bytes += pkt_len;
|
|
}
|
|
done:
|
|
write_reg(ioaddr, CMR1, CMR1_NextPkt);
|
|
lp->last_rx_time = jiffies;
|
|
return;
|
|
}
|
|
|
|
static void read_block(long ioaddr, int length, unsigned char *p, int data_mode)
|
|
{
|
|
|
|
if (data_mode <= 3) { /* Mode 0 or 1 */
|
|
outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL);
|
|
outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR,
|
|
ioaddr + PAR_DATA);
|
|
if (data_mode <= 1) { /* Mode 0 or 1 */
|
|
do *p++ = read_byte_mode0(ioaddr); while (--length > 0);
|
|
} else /* Mode 2 or 3 */
|
|
do *p++ = read_byte_mode2(ioaddr); while (--length > 0);
|
|
} else if (data_mode <= 5)
|
|
do *p++ = read_byte_mode4(ioaddr); while (--length > 0);
|
|
else
|
|
do *p++ = read_byte_mode6(ioaddr); while (--length > 0);
|
|
|
|
outb(EOC+HNib+MAR, ioaddr + PAR_DATA);
|
|
outb(Ctrl_SelData, ioaddr + PAR_CONTROL);
|
|
}
|
|
|
|
/* The inverse routine to net_open(). */
|
|
static int
|
|
net_close(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
del_timer_sync(&lp->timer);
|
|
|
|
/* Flush the Tx and disable Rx here. */
|
|
lp->addr_mode = CMR2h_OFF;
|
|
write_reg_high(ioaddr, CMR2, CMR2h_OFF);
|
|
|
|
/* Free the IRQ line. */
|
|
outb(0x00, ioaddr + PAR_CONTROL);
|
|
free_irq(dev->irq, dev);
|
|
|
|
/* Reset the ethernet hardware and activate the printer pass-through. */
|
|
write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
|
|
return 0;
|
|
}
|
|
|
|
/* Get the current statistics. This may be called with the card open or
|
|
closed. */
|
|
static struct net_device_stats *
|
|
net_get_stats(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
return &lp->stats;
|
|
}
|
|
|
|
/*
|
|
* Set or clear the multicast filter for this adapter.
|
|
*/
|
|
|
|
static void set_rx_mode_8002(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
|
|
if ( dev->mc_count > 0 || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) {
|
|
/* We must make the kernel realise we had to move
|
|
* into promisc mode or we start all out war on
|
|
* the cable. - AC
|
|
*/
|
|
dev->flags|=IFF_PROMISC;
|
|
lp->addr_mode = CMR2h_PROMISC;
|
|
} else
|
|
lp->addr_mode = CMR2h_Normal;
|
|
write_reg_high(ioaddr, CMR2, lp->addr_mode);
|
|
}
|
|
|
|
static void set_rx_mode_8012(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
long ioaddr = dev->base_addr;
|
|
unsigned char new_mode, mc_filter[8]; /* Multicast hash filter */
|
|
int i;
|
|
|
|
if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */
|
|
new_mode = CMR2h_PROMISC;
|
|
} else if ((dev->mc_count > 1000) || (dev->flags & IFF_ALLMULTI)) {
|
|
/* Too many to filter perfectly -- accept all multicasts. */
|
|
memset(mc_filter, 0xff, sizeof(mc_filter));
|
|
new_mode = CMR2h_Normal;
|
|
} else {
|
|
struct dev_mc_list *mclist;
|
|
|
|
memset(mc_filter, 0, sizeof(mc_filter));
|
|
for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
|
|
i++, mclist = mclist->next)
|
|
{
|
|
int filterbit = ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f;
|
|
mc_filter[filterbit >> 5] |= 1 << (filterbit & 31);
|
|
}
|
|
new_mode = CMR2h_Normal;
|
|
}
|
|
lp->addr_mode = new_mode;
|
|
write_reg(ioaddr, CMR2, CMR2_IRQOUT | 0x04); /* Switch to page 1. */
|
|
for (i = 0; i < 8; i++)
|
|
write_reg_byte(ioaddr, i, mc_filter[i]);
|
|
if (net_debug > 2 || 1) {
|
|
lp->addr_mode = 1;
|
|
printk(KERN_DEBUG "%s: Mode %d, setting multicast filter to",
|
|
dev->name, lp->addr_mode);
|
|
for (i = 0; i < 8; i++)
|
|
printk(" %2.2x", mc_filter[i]);
|
|
printk(".\n");
|
|
}
|
|
|
|
write_reg_high(ioaddr, CMR2, lp->addr_mode);
|
|
write_reg(ioaddr, CMR2, CMR2_IRQOUT); /* Switch back to page 0 */
|
|
}
|
|
|
|
static int __init atp_init_module(void) {
|
|
if (debug) /* Emit version even if no cards detected. */
|
|
printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
|
|
return atp_init();
|
|
}
|
|
|
|
static void __exit atp_cleanup_module(void) {
|
|
struct net_device *next_dev;
|
|
|
|
while (root_atp_dev) {
|
|
next_dev = ((struct net_local *)root_atp_dev->priv)->next_module;
|
|
unregister_netdev(root_atp_dev);
|
|
/* No need to release_region(), since we never snarf it. */
|
|
free_netdev(root_atp_dev);
|
|
root_atp_dev = next_dev;
|
|
}
|
|
}
|
|
|
|
module_init(atp_init_module);
|
|
module_exit(atp_cleanup_module);
|