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884 lines
27 KiB
884 lines
27 KiB
/* 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, [email protected]. |
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The author may be reached as [email protected], 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 version[] = |
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"atp.c:v1.09=ac 2002/10/01 Donald Becker <[email protected]>\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/ |
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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/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/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 <[email protected]>"); |
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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_hw_array(io, int, ioport, NULL, 0); |
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module_param_hw_array(irq, int, irq, 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 timer_list timer; /* Media selection timer. */ |
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struct net_device *dev; /* Timer dev. */ |
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unsigned 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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}; |
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/* This code, written by [email protected], 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(struct timer_list *t); |
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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 netdev_tx_t atp_send_packet(struct sk_buff *skb, |
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struct net_device *dev); |
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static irqreturn_t atp_interrupt(int irq, void *dev_id); |
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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 void set_rx_mode(struct net_device *dev); |
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static void tx_timeout(struct net_device *dev, unsigned int txqueue); |
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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 const struct net_device_ops atp_netdev_ops = { |
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.ndo_open = net_open, |
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.ndo_stop = net_close, |
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.ndo_start_xmit = atp_send_packet, |
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.ndo_set_rx_mode = set_rx_mode, |
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.ndo_tx_timeout = tx_timeout, |
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.ndo_set_mac_address = eth_mac_addr, |
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.ndo_validate_addr = eth_validate_addr, |
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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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/* 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", version); |
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#endif |
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printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, " |
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"SAPROM %pM.\n", |
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dev->name, dev->base_addr, dev->irq, dev->dev_addr); |
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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->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->netdev_ops = &atp_netdev_ops; |
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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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((__be16 *)dev->dev_addr)[i] = |
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cpu_to_be16(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 private 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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lp->dev = dev; |
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timer_setup(&lp->timer, atp_timed_checker, 0); |
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lp->timer.expires = jiffies + TIMED_CHECKER; |
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add_timer(&lp->timer); |
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netif_start_queue(dev); |
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return 0; |
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} |
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/* This routine resets the hardware. We initialize everything, assuming that |
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the hardware may have been temporarily detached. */ |
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static void hardware_init(struct net_device *dev) |
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{ |
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struct net_local *lp = netdev_priv(dev); |
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long ioaddr = dev->base_addr; |
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int i; |
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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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for (i = 0; i < 6; i++) |
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write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); |
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write_reg_high(ioaddr, CMR2, lp->addr_mode); |
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if (net_debug > 2) { |
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printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name, |
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(read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f); |
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} |
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write_reg(ioaddr, CMR2, CMR2_IRQOUT); |
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write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); |
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/* Enable the interrupt line from the serial port. */ |
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outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); |
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/* Unmask the interesting interrupts. */ |
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write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); |
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write_reg_high(ioaddr, IMR, ISRh_RxErr); |
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lp->tx_unit_busy = 0; |
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lp->pac_cnt_in_tx_buf = 0; |
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lp->saved_tx_size = 0; |
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} |
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static void trigger_send(long ioaddr, int length) |
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{ |
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write_reg_byte(ioaddr, TxCNT0, length & 0xff); |
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write_reg(ioaddr, TxCNT1, length >> 8); |
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write_reg(ioaddr, CMR1, CMR1_Xmit); |
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} |
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static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode) |
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{ |
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if (length & 1) |
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{ |
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length++; |
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pad_len++; |
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} |
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outb(EOC+MAR, ioaddr + PAR_DATA); |
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if ((data_mode & 1) == 0) { |
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/* Write the packet out, starting with the write addr. */ |
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outb(WrAddr+MAR, ioaddr + PAR_DATA); |
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do { |
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write_byte_mode0(ioaddr, *packet++); |
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} while (--length > pad_len) ; |
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do { |
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write_byte_mode0(ioaddr, 0); |
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} while (--length > 0) ; |
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} 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, unsigned int txqueue) |
|
{ |
|
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"); |
|
dev->stats.tx_errors++; |
|
/* Try to restart the adapter. */ |
|
hardware_init(dev); |
|
netif_trans_update(dev); /* prevent tx timeout */ |
|
netif_wake_queue(dev); |
|
dev->stats.tx_errors++; |
|
} |
|
|
|
static netdev_tx_t 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_kfree_skb (skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
|
|
/* The typical workload of the driver: |
|
Handle the network interface interrupts. */ |
|
static irqreturn_t atp_interrupt(int irq, void *dev_instance) |
|
{ |
|
struct net_device *dev = dev_instance; |
|
struct net_local *lp; |
|
long ioaddr; |
|
static int num_tx_since_rx; |
|
int boguscount = max_interrupt_work; |
|
int handled = 0; |
|
|
|
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. */ |
|
dev->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)) { |
|
dev->stats.collisions++; |
|
if (++lp->re_tx > 15) { |
|
dev->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. */ |
|
dev->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, lp->last_rx_time + 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 - lp->last_rx_time, status, |
|
(read_nibble(ioaddr, CMR1) >> 3) & 15); |
|
dev->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(struct timer_list *t) |
|
{ |
|
struct net_local *lp = from_timer(lp, t, timer); |
|
struct net_device *dev = lp->dev; |
|
long ioaddr = dev->base_addr; |
|
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) |
|
dev->stats.tx_errors++; |
|
else if (i == 3) |
|
dev->stats.tx_dropped++; |
|
else if (i == 4) |
|
dev->stats.collisions++; |
|
else |
|
dev->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) { |
|
dev->stats.rx_errors++; |
|
if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++; |
|
else if (rx_head.rx_status & 0x0002) dev->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) { |
|
dev->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 = netdev_alloc_skb(dev, pkt_len + 2); |
|
if (skb == NULL) { |
|
dev->stats.rx_dropped++; |
|
goto done; |
|
} |
|
|
|
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->stats.rx_packets++; |
|
dev->stats.rx_bytes += pkt_len; |
|
} |
|
done: |
|
write_reg(ioaddr, CMR1, CMR1_NextPkt); |
|
lp->last_rx_time = jiffies; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* Set or clear the multicast filter for this adapter. |
|
*/ |
|
|
|
static void set_rx_mode(struct net_device *dev) |
|
{ |
|
struct net_local *lp = netdev_priv(dev); |
|
long ioaddr = dev->base_addr; |
|
|
|
if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) |
|
lp->addr_mode = CMR2h_PROMISC; |
|
else |
|
lp->addr_mode = CMR2h_Normal; |
|
write_reg_high(ioaddr, CMR2, lp->addr_mode); |
|
} |
|
|
|
static int __init atp_init_module(void) { |
|
if (debug) /* Emit version even if no cards detected. */ |
|
printk(KERN_INFO "%s", version); |
|
return atp_init(); |
|
} |
|
|
|
static void __exit atp_cleanup_module(void) { |
|
struct net_device *next_dev; |
|
|
|
while (root_atp_dev) { |
|
struct net_local *atp_local = netdev_priv(root_atp_dev); |
|
next_dev = atp_local->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);
|
|
|