diff options
Diffstat (limited to 'i386/i386at/gpl/linux/net/atp.c')
| -rw-r--r-- | i386/i386at/gpl/linux/net/atp.c | 787 |
1 files changed, 787 insertions, 0 deletions
diff --git a/i386/i386at/gpl/linux/net/atp.c b/i386/i386at/gpl/linux/net/atp.c new file mode 100644 index 00000000..62aa04ef --- /dev/null +++ b/i386/i386at/gpl/linux/net/atp.c @@ -0,0 +1,787 @@ +/* atp.c: Attached (pocket) ethernet adapter driver for linux. */ +/* + This is a driver for a commonly OEMed pocket (parallel port) + ethernet adapter. + + Written 1993,1994,1995 by Donald Becker. + + Copyright 1993 United States Government as represented by the + Director, National Security Agency. + + This software may be used and distributed according to the terms + of the GNU Public License, incorporated herein by reference. + + The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O + Center of Excellence in Space Data and Information Sciences + Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771 + + The timer-based reset code was written by Bill Carlson, wwc@super.org. +*/ + +static const char *version = + "atp.c:v1.01 1/18/95 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; + +/* + 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. + + 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. + + 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/sched.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/malloc.h> +#include <linux/string.h> +#include <asm/system.h> +#include <asm/bitops.h> +#include <asm/io.h> +#include <asm/dma.h> +#include <linux/errno.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +#include "atp.h" + +/* use 0 for production, 1 for verification, >2 for debug */ +#ifndef NET_DEBUG +#define NET_DEBUG 1 +#endif +static unsigned int net_debug = NET_DEBUG; + +/* The number of low I/O ports used by the ethercard. */ +#define ETHERCARD_TOTAL_SIZE 3 + +/* 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); +static struct device *atp_timed_dev; +static struct timer_list atp_timer = {NULL, NULL, 0, 0, atp_timed_checker}; +#endif + +/* Index to functions, as function prototypes. */ + +extern int atp_probe(struct device *dev); + +static int atp_probe1(struct device *dev, short ioaddr); +static void get_node_ID(struct device *dev); +static unsigned short eeprom_op(short ioaddr, unsigned int cmd); +static int net_open(struct device *dev); +static void hardware_init(struct device *dev); +static void write_packet(short ioaddr, int length, unsigned char *packet, int mode); +static void trigger_send(short ioaddr, int length); +static int net_send_packet(struct sk_buff *skb, struct device *dev); +static void net_interrupt(int irq, struct pt_regs *regs); +static void net_rx(struct device *dev); +static void read_block(short ioaddr, int length, unsigned char *buffer, int data_mode); +static int net_close(struct device *dev); +static struct enet_statistics *net_get_stats(struct device *dev); +static void set_multicast_list(struct device *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). + */ +int +atp_init(struct device *dev) +{ + int *port, ports[] = {0x378, 0x278, 0x3bc, 0}; + int base_addr = dev->base_addr; + + if (base_addr > 0x1ff) /* Check a single specified location. */ + return atp_probe1(dev, base_addr); + else if (base_addr == 1) /* Don't probe at all. */ + return ENXIO; + + for (port = ports; *port; port++) { + int ioaddr = *port; + outb(0x57, ioaddr + PAR_DATA); + if (inb(ioaddr + PAR_DATA) != 0x57) + continue; + if (atp_probe1(dev, ioaddr) == 0) + return 0; + } + + return ENODEV; +} + +static int atp_probe1(struct device *dev, short ioaddr) +{ + int saved_ctrl_reg, status; + + 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); + /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */ + outb(0x04, ioaddr + PAR_CONTROL); + write_reg_high(ioaddr, CMR1, CMR1h_RESET); + eeprom_delay(2048); + status = read_nibble(ioaddr, CMR1); + + if ((status & 0x78) != 0x08) { + /* The pocket adapter probe failed, restore the control register. */ + outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); + return 1; + } + status = read_nibble(ioaddr, CMR2_h); + if ((status & 0x78) != 0x10) { + outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); + return 1; + } + /* 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 (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); + + printk("%s: Pocket adapter found at %#3lx, IRQ %d, SAPROM " + "%02X:%02X:%02X:%02X:%02X:%02X.\n", dev->name, dev->base_addr, + dev->irq, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2], + dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]); + + /* Leave the hardware in a reset state. */ + write_reg_high(ioaddr, CMR1, CMR1h_RESET); + + if (net_debug) + printk(version); + + /* Initialize the device structure. */ + ether_setup(dev); + dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL); + if (dev->priv == NULL) + return -ENOMEM; + memset(dev->priv, 0, sizeof(struct net_local)); + + + { + struct net_local *lp = (struct net_local *)dev->priv; + lp->addr_mode = CMR2h_Normal; + } + + /* For the ATP adapter the "if_port" is really the data transfer mode. */ + dev->if_port = (dev->mem_start & 0xf) ? dev->mem_start & 0x7 : 4; + if (dev->mem_end & 0xf) + net_debug = dev->mem_end & 7; + + dev->open = net_open; + dev->stop = net_close; + dev->hard_start_xmit = net_send_packet; + dev->get_stats = net_get_stats; + dev->set_multicast_list = &set_multicast_list; + +#ifdef TIMED_CHECKER + del_timer(&atp_timer); + atp_timer.expires = jiffies + TIMED_CHECKER; + atp_timed_dev = dev; + add_timer(&atp_timer); +#endif + return 0; +} + +/* Read the station address PROM, usually a word-wide EEPROM. */ +static void get_node_ID(struct device *dev) +{ + short 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++) + ((unsigned short *)dev->dev_addr)[i] = + ntohs(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 eeprom_op(short ioaddr, unsigned int cmd) +{ + unsigned eedata_out = 0; + int num_bits = EE_CMD_SIZE; + + while (--num_bits >= 0) { + char outval = test_bit(num_bits, &cmd) ? EE_DATA_WRITE : 0; + write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW); + eeprom_delay(5); + write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH); + eedata_out <<= 1; + if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ) + eedata_out++; + eeprom_delay(5); + } + 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 dev->priv entry then it wasn't + probed for at boot-time, and we need to probe for it again. + */ +static int net_open(struct device *dev) +{ + + /* 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. */ + if (irq2dev_map[dev->irq] != 0 + || (irq2dev_map[dev->irq] = dev) == 0 + || request_irq(dev->irq, &net_interrupt, 0, "ATP")) { + return -EAGAIN; + } + + hardware_init(dev); + dev->start = 1; + return 0; +} + +/* This routine resets the hardware. We initialize everything, assuming that + the hardware may have been temporarily detached. */ +static void hardware_init(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + int ioaddr = dev->base_addr; + int i; + + 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("%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; + + dev->tbusy = 0; + dev->interrupt = 0; +} + +static void trigger_send(short 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(short ioaddr, int length, unsigned char *packet, int data_mode) +{ + length = (length + 1) & ~1; /* Round up to word length. */ + 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 > 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 > 0) + write_byte_mode1(ioaddr, *packet++); + } + /* Terminate the Tx frame. End of write: ECB. */ + outb(0xff, ioaddr + PAR_DATA); + outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL); +} + +static int +net_send_packet(struct sk_buff *skb, struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + int ioaddr = dev->base_addr; + + if (dev->tbusy) { + /* If we get here, some higher level has decided we are broken. + There should really be a "kick me" function call instead. */ + int tickssofar = jiffies - dev->trans_start; + if (tickssofar < 5) + return 1; + printk("%s: transmit timed out, %s?\n", dev->name, + inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem" + : "IRQ conflict"); + lp->stats.tx_errors++; + /* Try to restart the adapter. */ + hardware_init(dev); + dev->tbusy=0; + dev->trans_start = jiffies; + } + + /* If some higher layer thinks we've missed an tx-done interrupt + we are passed NULL. Caution: dev_tint() handles the cli()/sti() + itself. */ + if (skb == NULL) { + dev_tint(dev); + return 0; + } + + /* Block a timer-based transmit from overlapping. This could better be + done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */ + if (set_bit(0, (void*)&dev->tbusy) != 0) + printk("%s: Transmitter access conflict.\n", dev->name); + else { + short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; + unsigned char *buf = skb->data; + int flags; + + /* Disable interrupts by writing 0x00 to the Interrupt Mask Register. + This sequence must not be interrupted by an incoming packet. */ + save_flags(flags); + cli(); + write_reg(ioaddr, IMR, 0); + write_reg_high(ioaddr, IMR, 0); + restore_flags(flags); + + write_packet(ioaddr, length, buf, 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; + + dev->trans_start = jiffies; + /* 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, FREE_WRITE); + + return 0; +} + +/* The typical workload of the driver: + Handle the network interface interrupts. */ +static void +net_interrupt(int irq, struct pt_regs * regs) +{ + struct device *dev = (struct device *)(irq2dev_map[irq]); + struct net_local *lp; + int ioaddr, status, boguscount = 20; + static int num_tx_since_rx = 0; + + if (dev == NULL) { + printk ("ATP_interrupt(): irq %d for unknown device.\n", irq); + return; + } + dev->interrupt = 1; + + ioaddr = dev->base_addr; + lp = (struct net_local *)dev->priv; + + /* 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("%s: In interrupt ", dev->name); + while (--boguscount > 0) { + status = read_nibble(ioaddr, ISR); + if (net_debug > 5) printk("loop status %02x..", status); + + if (status & (ISR_RxOK<<3)) { + 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); + dev->last_rx = jiffies; + num_tx_since_rx = 0; + } else + break; + } while (--boguscount > 0); + } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) { + 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; + dev->tbusy = 0; + mark_bh(NET_BH); /* Inform upper layers. */ + } + num_tx_since_rx++; + } else if (num_tx_since_rx > 8 + && jiffies > dev->last_rx + 100) { + if (net_debug > 2) + printk("%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]); +#ifdef TIMED_CHECKER + del_timer(&atp_timer); + atp_timer.expires = jiffies + TIMED_CHECKER; + add_timer(&atp_timer); +#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? */ + + if (net_debug > 5) printk("exiting interrupt.\n"); + + dev->interrupt = 0; + + return; +} + +#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 ignored) +{ + int i; + int ioaddr = atp_timed_dev->base_addr; + + if (!atp_timed_dev->interrupt) + { + for (i = 0; i < 6; i++) +#if 0 + if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i]) + { + struct net_local *lp = (struct net_local *)atp_timed_dev->priv; + 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++; + } +#else + write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]); +#endif + } + del_timer(&atp_timer); + atp_timer.expires = jiffies + TIMED_CHECKER; + add_timer(&atp_timer); +} +#endif + +/* We have a good packet(s), get it/them out of the buffers. */ +static void net_rx(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + int ioaddr = dev->base_addr; +#ifdef notdef + ushort header[4]; +#else + struct rx_header rx_head; +#endif + + /* 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(" 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++; + /* Ackkk! I don't have any documentation on what the error bits mean! + The best I can do is slap the device around a bit. */ + if (net_debug > 3) printk("%s: Unknown ATP Rx error %04x.\n", + dev->name, rx_head.rx_status); + hardware_init(dev); + return; + } else { + /* Malloc up new buffer. */ + int pkt_len = (rx_head.rx_count & 0x7ff) - 4; /* The "-4" is omits the FCS (CRC). */ + struct sk_buff *skb; + + skb = dev_alloc_skb(pkt_len); + if (skb == NULL) { + printk("%s: Memory squeeze, dropping packet.\n", dev->name); + lp->stats.rx_dropped++; + goto done; + } + skb->dev = dev; + + read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port); + + if (net_debug > 6) { + unsigned char *data = skb->data; + printk(" data %02x%02x%02x %02x%02x%02x %02x%02x%02x" + "%02x%02x%02x %02x%02x..", + data[0], data[1], data[2], data[3], data[4], data[5], + data[6], data[7], data[8], data[9], data[10], data[11], + data[12], data[13]); + } + + skb->protocol=eth_type_trans(skb,dev); + netif_rx(skb); + lp->stats.rx_packets++; + } + done: + write_reg(ioaddr, CMR1, CMR1_NextPkt); + return; +} + +static void read_block(short 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 device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + int ioaddr = dev->base_addr; + + dev->tbusy = 1; + dev->start = 0; + + /* 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); + irq2dev_map[dev->irq] = 0; + + /* Leave the hardware in a reset state. */ + write_reg_high(ioaddr, CMR1, CMR1h_RESET); + + return 0; +} + +/* Get the current statistics. This may be called with the card open or + closed. */ +static struct enet_statistics * +net_get_stats(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + return &lp->stats; +} + +/* + * Set or clear the multicast filter for this adapter. + */ + +static void set_multicast_list(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + short ioaddr = dev->base_addr; + int num_addrs=dev->mc_list; + + if(dev->flags&(IFF_ALLMULTI|IFF_PROMISC)) + num_addrs=1; + /* + * We must make the kernel realise we had to move + * into promisc mode or we start all out war on + * the cable. - AC + */ + if(num_addrs) + dev->flags|=IFF_PROMISC; + lp->addr_mode = num_addrs ? CMR2h_PROMISC : CMR2h_Normal; + write_reg_high(ioaddr, CMR2, lp->addr_mode); +} + +/* + * Local variables: + * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c atp.c" + * version-control: t + * kept-new-versions: 5 + * tab-width: 4 + * End: + */ |