--- /dev/null
+/* atp.c: Attached (pocket) ethernet adapter driver for linux. */
+/*
+ This is a driver for commonly OEM pocket (parallel port)
+ ethernet adapters based on the Realtek RTL8002 and RTL8012 chips.
+
+ Written 1993-2000 by Donald Becker.
+
+ This software may be used and distributed according to the terms of
+ the GNU General Public License (GPL), incorporated herein by reference.
+ Drivers based on or derived from this code fall under the GPL and must
+ retain the authorship, copyright and license notice. This file is not
+ a complete program and may only be used when the entire operating
+ system is licensed under the GPL.
+
+ Copyright 1993 United States Government as represented by the Director,
+ National Security Agency. Copyright 1994-2000 retained by the original
+ author, Donald Becker. The timer-based reset code was supplied in 1995
+ by Bill Carlson, wwc@super.org.
+
+ The author may be reached as becker@scyld.com, or C/O
+ Scyld Computing Corporation
+ 410 Severn Ave., Suite 210
+ Annapolis MD 21403
+
+ Support information and updates available at
+ http://www.scyld.com/network/atp.html
+
+
+ Modular support/softnet added by Alan Cox.
+ _bit abuse fixed up by Alan Cox
+
+*/
+
+static const char version[] =
+"atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n";
+
+/* The user-configurable values.
+ These may be modified when a driver module is loaded.*/
+
+static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
+#define net_debug debug
+
+/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
+static int max_interrupt_work = 15;
+
+#define NUM_UNITS 2
+/* The standard set of ISA module parameters. */
+static int io[NUM_UNITS];
+static int irq[NUM_UNITS];
+static int xcvr[NUM_UNITS]; /* The data transfer mode. */
+
+/* Operational parameters that are set at compile time. */
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT (400*HZ/1000)
+
+/*
+ This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket
+ ethernet adapter. This is a common low-cost OEM pocket ethernet
+ adapter, sold under many names.
+
+ Sources:
+ This driver was written from the packet driver assembly code provided by
+ Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated
+ device works just from the assembly code? It ain't pretty. The following
+ description is written based on guesses and writing lots of special-purpose
+ code to test my theorized operation.
+
+ In 1997 Realtek made available the documentation for the second generation
+ RTL8012 chip, which has lead to several driver improvements.
+ http://www.realtek.com.tw/
+
+ Theory of Operation
+
+ The RTL8002 adapter seems to be built around a custom spin of the SEEQ
+ controller core. It probably has a 16K or 64K internal packet buffer, of
+ which the first 4K is devoted to transmit and the rest to receive.
+ The controller maintains the queue of received packet and the packet buffer
+ access pointer internally, with only 'reset to beginning' and 'skip to next
+ packet' commands visible. The transmit packet queue holds two (or more?)
+ packets: both 'retransmit this packet' (due to collision) and 'transmit next
+ packet' commands must be started by hand.
+
+ The station address is stored in a standard bit-serial EEPROM which must be
+ read (ughh) by the device driver. (Provisions have been made for
+ substituting a 74S288 PROM, but I haven't gotten reports of any models
+ using it.) Unlike built-in devices, a pocket adapter can temporarily lose
+ power without indication to the device driver. The major effect is that
+ the station address, receive filter (promiscuous, etc.) and transceiver
+ must be reset.
+
+ The controller itself has 16 registers, some of which use only the lower
+ bits. The registers are read and written 4 bits at a time. The four bit
+ register address is presented on the data lines along with a few additional
+ timing and control bits. The data is then read from status port or written
+ to the data port.
+
+ Correction: the controller has two banks of 16 registers. The second
+ bank contains only the multicast filter table (now used) and the EEPROM
+ access registers.
+
+ Since the bulk data transfer of the actual packets through the slow
+ parallel port dominates the driver's running time, four distinct data
+ (non-register) transfer modes are provided by the adapter, two in each
+ direction. In the first mode timing for the nibble transfers is
+ provided through the data port. In the second mode the same timing is
+ provided through the control port. In either case the data is read from
+ the status port and written to the data port, just as it is accessing
+ registers.
+
+ In addition to the basic data transfer methods, several more are modes are
+ created by adding some delay by doing multiple reads of the data to allow
+ it to stabilize. This delay seems to be needed on most machines.
+
+ The data transfer mode is stored in the 'dev->if_port' field. Its default
+ value is '4'. It may be overridden at boot-time using the third parameter
+ to the "ether=..." initialization.
+
+ The header file <atp.h> provides inline functions that encapsulate the
+ register and data access methods. These functions are hand-tuned to
+ generate reasonable object code. This header file also documents my
+ interpretations of the device registers.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "atp.h"
+
+MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
+MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_param(max_interrupt_work, int, 0);
+module_param(debug, int, 0);
+module_param_array(io, int, NULL, 0);
+module_param_array(irq, int, NULL, 0);
+module_param_array(xcvr, int, NULL, 0);
+MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt");
+MODULE_PARM_DESC(debug, "ATP debug level (0-7)");
+MODULE_PARM_DESC(io, "ATP I/O base address(es)");
+MODULE_PARM_DESC(irq, "ATP IRQ number(s)");
+MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)");
+
+/* The number of low I/O ports used by the ethercard. */
+#define ETHERCARD_TOTAL_SIZE 3
+
+/* Sequence to switch an 8012 from printer mux to ethernet mode. */
+static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,};
+
+struct net_local {
+ spinlock_t lock;
+ struct net_device *next_module;
+ struct timer_list timer; /* Media selection timer. */
+ long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */
+ int saved_tx_size;
+ unsigned int tx_unit_busy:1;
+ unsigned char re_tx, /* Number of packet retransmissions. */
+ addr_mode, /* Current Rx filter e.g. promiscuous, etc. */
+ pac_cnt_in_tx_buf;
+};
+
+/* This code, written by wwc@super.org, resets the adapter every
+ TIMED_CHECKER ticks. This recovers from an unknown error which
+ hangs the device. */
+#define TIMED_CHECKER (HZ/4)
+#ifdef TIMED_CHECKER
+#include <linux/timer.h>
+static void atp_timed_checker(unsigned long ignored);
+#endif
+
+/* Index to functions, as function prototypes. */
+
+static int atp_probe1(long ioaddr);
+static void get_node_ID(struct net_device *dev);
+static unsigned short eeprom_op(long ioaddr, unsigned int cmd);
+static int net_open(struct net_device *dev);
+static void hardware_init(struct net_device *dev);
+static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode);
+static void trigger_send(long ioaddr, int length);
+static netdev_tx_t atp_send_packet(struct sk_buff *skb,
+ struct net_device *dev);
+static irqreturn_t atp_interrupt(int irq, void *dev_id);
+static void net_rx(struct net_device *dev);
+static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode);
+static int net_close(struct net_device *dev);
+static void set_rx_mode(struct net_device *dev);
+static void tx_timeout(struct net_device *dev);
+
+
+/* A list of all installed ATP devices, for removing the driver module. */
+static struct net_device *root_atp_dev;
+
+/* Check for a network adapter of this type, and return '0' iff one exists.
+ If dev->base_addr == 0, probe all likely locations.
+ If dev->base_addr == 1, always return failure.
+ If dev->base_addr == 2, allocate space for the device and return success
+ (detachable devices only).
+
+ FIXME: we should use the parport layer for this
+ */
+static int __init atp_init(void)
+{
+ int *port, ports[] = {0x378, 0x278, 0x3bc, 0};
+ int base_addr = io[0];
+
+ if (base_addr > 0x1ff) /* Check a single specified location. */
+ return atp_probe1(base_addr);
+ else if (base_addr == 1) /* Don't probe at all. */
+ return -ENXIO;
+
+ for (port = ports; *port; port++) {
+ long ioaddr = *port;
+ outb(0x57, ioaddr + PAR_DATA);
+ if (inb(ioaddr + PAR_DATA) != 0x57)
+ continue;
+ if (atp_probe1(ioaddr) == 0)
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static const struct net_device_ops atp_netdev_ops = {
+ .ndo_open = net_open,
+ .ndo_stop = net_close,
+ .ndo_start_xmit = atp_send_packet,
+ .ndo_set_rx_mode = set_rx_mode,
+ .ndo_tx_timeout = tx_timeout,
+ .ndo_change_mtu = eth_change_mtu,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+};
+
+static int __init atp_probe1(long ioaddr)
+{
+ struct net_device *dev = NULL;
+ struct net_local *lp;
+ int saved_ctrl_reg, status, i;
+ int res;
+
+ outb(0xff, ioaddr + PAR_DATA);
+ /* Save the original value of the Control register, in case we guessed
+ wrong. */
+ saved_ctrl_reg = inb(ioaddr + PAR_CONTROL);
+ if (net_debug > 3)
+ printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg);
+ /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */
+ outb(0x04, ioaddr + PAR_CONTROL);
+#ifndef final_version
+ if (net_debug > 3) {
+ /* Turn off the printer multiplexer on the 8012. */
+ for (i = 0; i < 8; i++)
+ outb(mux_8012[i], ioaddr + PAR_DATA);
+ write_reg(ioaddr, MODSEL, 0x00);
+ printk("atp: Registers are ");
+ for (i = 0; i < 32; i++)
+ printk(" %2.2x", read_nibble(ioaddr, i));
+ printk(".\n");
+ }
+#endif
+ /* 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);
+ /* udelay() here? */
+ status = read_nibble(ioaddr, CMR1);
+
+ if (net_debug > 3) {
+ printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status);
+ for (i = 0; i < 32; i++)
+ printk(" %2.2x", read_nibble(ioaddr, i));
+ printk("\n");
+ }
+
+ if ((status & 0x78) != 0x08) {
+ /* The pocket adapter probe failed, restore the control register. */
+ outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
+ return -ENODEV;
+ }
+ status = read_nibble(ioaddr, CMR2_h);
+ if ((status & 0x78) != 0x10) {
+ outb(saved_ctrl_reg, ioaddr + PAR_CONTROL);
+ return -ENODEV;
+ }
+
+ dev = alloc_etherdev(sizeof(struct net_local));
+ if (!dev)
+ return -ENOMEM;
+
+ /* Find the IRQ used by triggering an interrupt. */
+ write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */
+ write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */
+
+ /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */
+ if (irq[0])
+ dev->irq = irq[0];
+ else if (ioaddr == 0x378)
+ dev->irq = 7;
+ else
+ dev->irq = 5;
+ write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */
+ write_reg(ioaddr, CMR2, CMR2_NULL);
+
+ dev->base_addr = ioaddr;
+
+ /* Read the station address PROM. */
+ get_node_ID(dev);
+
+#ifndef MODULE
+ if (net_debug)
+ printk(KERN_INFO "%s", version);
+#endif
+
+ printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, "
+ "SAPROM %pM.\n",
+ dev->name, dev->base_addr, dev->irq, dev->dev_addr);
+
+ /* Reset the ethernet hardware and activate the printer pass-through. */
+ write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX);
+
+ lp = netdev_priv(dev);
+ lp->addr_mode = CMR2h_Normal;
+ spin_lock_init(&lp->lock);
+
+ /* For the ATP adapter the "if_port" is really the data transfer mode. */
+ if (xcvr[0])
+ dev->if_port = xcvr[0];
+ else
+ dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4;
+ if (dev->mem_end & 0xf)
+ net_debug = dev->mem_end & 7;
+
+ dev->netdev_ops = &atp_netdev_ops;
+ dev->watchdog_timeo = TX_TIMEOUT;
+
+ res = register_netdev(dev);
+ if (res) {
+ free_netdev(dev);
+ return res;
+ }
+
+ lp->next_module = root_atp_dev;
+ root_atp_dev = dev;
+
+ return 0;
+}
+
+/* Read the station address PROM, usually a word-wide EEPROM. */
+static void __init get_node_ID(struct net_device *dev)
+{
+ long ioaddr = dev->base_addr;
+ int sa_offset = 0;
+ int i;
+
+ write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */
+
+ /* Some adapters have the station address at offset 15 instead of offset
+ zero. Check for it, and fix it if needed. */
+ if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff)
+ sa_offset = 15;
+
+ for (i = 0; i < 3; i++)
+ ((__be16 *)dev->dev_addr)[i] =
+ cpu_to_be16(eeprom_op(ioaddr, EE_READ(sa_offset + i)));
+
+ write_reg(ioaddr, CMR2, CMR2_NULL);
+}
+
+/*
+ An EEPROM read command starts by shifting out 0x60+address, and then
+ shifting in the serial data. See the NatSemi databook for details.
+ * ________________
+ * CS : __|
+ * ___ ___
+ * CLK: ______| |___| |
+ * __ _______ _______
+ * DI : __X_______X_______X
+ * DO : _________X_______X
+ */
+
+static unsigned short __init eeprom_op(long ioaddr, u32 cmd)
+{
+ unsigned eedata_out = 0;
+ int num_bits = EE_CMD_SIZE;
+
+ while (--num_bits >= 0) {
+ char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0;
+ write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW);
+ write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH);
+ eedata_out <<= 1;
+ if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ)
+ eedata_out++;
+ }
+ write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS);
+ return eedata_out;
+}
+
+
+/* Open/initialize the board. This is called (in the current kernel)
+ sometime after booting when the 'ifconfig' program is run.
+
+ This routine sets everything up anew at each open, even
+ registers that "should" only need to be set once at boot, so that
+ there is non-reboot way to recover if something goes wrong.
+
+ This is an attachable device: if there is no private entry then it wasn't
+ probed for at boot-time, and we need to probe for it again.
+ */
+static int net_open(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ret;
+
+ /* The interrupt line is turned off (tri-stated) when the device isn't in
+ use. That's especially important for "attached" interfaces where the
+ port or interrupt may be shared. */
+ ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev);
+ if (ret)
+ return ret;
+
+ hardware_init(dev);
+
+ init_timer(&lp->timer);
+ lp->timer.expires = jiffies + TIMED_CHECKER;
+ lp->timer.data = (unsigned long)dev;
+ lp->timer.function = atp_timed_checker; /* timer handler */
+ 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)
+{
+ 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);
+ dev->trans_start = jiffies; /* 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, 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);
+ 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(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)
+ 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->last_rx = jiffies;
+ 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);
Code Review / kvmfornfv.git / blobdiff