Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/net/3c507.c b/drivers/net/3c507.c
new file mode 100644
index 0000000..4db8289
--- /dev/null
+++ b/drivers/net/3c507.c
@@ -0,0 +1,965 @@
+/* 3c507.c: An EtherLink16 device driver for Linux. */
+/*
+ Written 1993,1994 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 General Public License, incorporated herein by reference.
+
+ The author may be reached as becker@scyld.com, or C/O
+ Scyld Computing Corporation
+ 410 Severn Ave., Suite 210
+ Annapolis MD 21403
+
+
+ Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings)
+ and jrs@world.std.com (Rick Sladkey) for testing and bugfixes.
+ Mark Salazar <leslie@access.digex.net> made the changes for cards with
+ only 16K packet buffers.
+
+ Things remaining to do:
+ Verify that the tx and rx buffers don't have fencepost errors.
+ Move the theory of operation and memory map documentation.
+ The statistics need to be updated correctly.
+*/
+
+#define DRV_NAME "3c507"
+#define DRV_VERSION "1.10a"
+#define DRV_RELDATE "11/17/2001"
+
+static const char version[] =
+ DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Donald Becker (becker@scyld.com)\n";
+
+/*
+ Sources:
+ This driver wouldn't have been written with the availability of the
+ Crynwr driver source code. It provided a known-working implementation
+ that filled in the gaping holes of the Intel documentation. Three cheers
+ for Russ Nelson.
+
+ Intel Microcommunications Databook, Vol. 1, 1990. It provides just enough
+ info that the casual reader might think that it documents the i82586 :-<.
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.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/spinlock.h>
+#include <linux/ethtool.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+/* use 0 for production, 1 for verification, 2..7 for debug */
+#ifndef NET_DEBUG
+#define NET_DEBUG 1
+#endif
+static unsigned int net_debug = NET_DEBUG;
+#define debug net_debug
+
+
+/*
+ Details of the i82586.
+
+ You'll really need the databook to understand the details of this part,
+ but the outline is that the i82586 has two separate processing units.
+ Both are started from a list of three configuration tables, of which only
+ the last, the System Control Block (SCB), is used after reset-time. The SCB
+ has the following fields:
+ Status word
+ Command word
+ Tx/Command block addr.
+ Rx block addr.
+ The command word accepts the following controls for the Tx and Rx units:
+ */
+
+#define CUC_START 0x0100
+#define CUC_RESUME 0x0200
+#define CUC_SUSPEND 0x0300
+#define RX_START 0x0010
+#define RX_RESUME 0x0020
+#define RX_SUSPEND 0x0030
+
+/* The Rx unit uses a list of frame descriptors and a list of data buffer
+ descriptors. We use full-sized (1518 byte) data buffers, so there is
+ a one-to-one pairing of frame descriptors to buffer descriptors.
+
+ The Tx ("command") unit executes a list of commands that look like:
+ Status word Written by the 82586 when the command is done.
+ Command word Command in lower 3 bits, post-command action in upper 3
+ Link word The address of the next command.
+ Parameters (as needed).
+
+ Some definitions related to the Command Word are:
+ */
+#define CMD_EOL 0x8000 /* The last command of the list, stop. */
+#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
+#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
+
+enum commands {
+ CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
+ CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7};
+
+/* Information that need to be kept for each board. */
+struct net_local {
+ struct net_device_stats stats;
+ int last_restart;
+ ushort rx_head;
+ ushort rx_tail;
+ ushort tx_head;
+ ushort tx_cmd_link;
+ ushort tx_reap;
+ ushort tx_pkts_in_ring;
+ spinlock_t lock;
+ void __iomem *base;
+};
+
+/*
+ Details of the EtherLink16 Implementation
+ The 3c507 is a generic shared-memory i82586 implementation.
+ The host can map 16K, 32K, 48K, or 64K of the 64K memory into
+ 0x0[CD][08]0000, or all 64K into 0xF[02468]0000.
+ */
+
+/* Offsets from the base I/O address. */
+#define SA_DATA 0 /* Station address data, or 3Com signature. */
+#define MISC_CTRL 6 /* Switch the SA_DATA banks, and bus config bits. */
+#define RESET_IRQ 10 /* Reset the latched IRQ line. */
+#define SIGNAL_CA 11 /* Frob the 82586 Channel Attention line. */
+#define ROM_CONFIG 13
+#define MEM_CONFIG 14
+#define IRQ_CONFIG 15
+#define EL16_IO_EXTENT 16
+
+/* The ID port is used at boot-time to locate the ethercard. */
+#define ID_PORT 0x100
+
+/* Offsets to registers in the mailbox (SCB). */
+#define iSCB_STATUS 0x8
+#define iSCB_CMD 0xA
+#define iSCB_CBL 0xC /* Command BLock offset. */
+#define iSCB_RFA 0xE /* Rx Frame Area offset. */
+
+/* Since the 3c507 maps the shared memory window so that the last byte is
+ at 82586 address FFFF, the first byte is at 82586 address 0, 16K, 32K, or
+ 48K corresponding to window sizes of 64K, 48K, 32K and 16K respectively.
+ We can account for this be setting the 'SBC Base' entry in the ISCP table
+ below for all the 16 bit offset addresses, and also adding the 'SCB Base'
+ value to all 24 bit physical addresses (in the SCP table and the TX and RX
+ Buffer Descriptors).
+ -Mark
+ */
+#define SCB_BASE ((unsigned)64*1024 - (dev->mem_end - dev->mem_start))
+
+/*
+ What follows in 'init_words[]' is the "program" that is downloaded to the
+ 82586 memory. It's mostly tables and command blocks, and starts at the
+ reset address 0xfffff6. This is designed to be similar to the EtherExpress,
+ thus the unusual location of the SCB at 0x0008.
+
+ Even with the additional "don't care" values, doing it this way takes less
+ program space than initializing the individual tables, and I feel it's much
+ cleaner.
+
+ The databook is particularly useless for the first two structures, I had
+ to use the Crynwr driver as an example.
+
+ The memory setup is as follows:
+ */
+
+#define CONFIG_CMD 0x0018
+#define SET_SA_CMD 0x0024
+#define SA_OFFSET 0x002A
+#define IDLELOOP 0x30
+#define TDR_CMD 0x38
+#define TDR_TIME 0x3C
+#define DUMP_CMD 0x40
+#define DIAG_CMD 0x48
+#define SET_MC_CMD 0x4E
+#define DUMP_DATA 0x56 /* A 170 byte buffer for dump and Set-MC into. */
+
+#define TX_BUF_START 0x0100
+#define NUM_TX_BUFS 5
+#define TX_BUF_SIZE (1518+14+20+16) /* packet+header+TBD */
+
+#define RX_BUF_START 0x2000
+#define RX_BUF_SIZE (1518+14+18) /* packet+header+RBD */
+#define RX_BUF_END (dev->mem_end - dev->mem_start)
+
+#define TX_TIMEOUT 5
+
+/*
+ That's it: only 86 bytes to set up the beast, including every extra
+ command available. The 170 byte buffer at DUMP_DATA is shared between the
+ Dump command (called only by the diagnostic program) and the SetMulticastList
+ command.
+
+ To complete the memory setup you only have to write the station address at
+ SA_OFFSET and create the Tx & Rx buffer lists.
+
+ The Tx command chain and buffer list is setup as follows:
+ A Tx command table, with the data buffer pointing to...
+ A Tx data buffer descriptor. The packet is in a single buffer, rather than
+ chaining together several smaller buffers.
+ A NoOp command, which initially points to itself,
+ And the packet data.
+
+ A transmit is done by filling in the Tx command table and data buffer,
+ re-writing the NoOp command, and finally changing the offset of the last
+ command to point to the current Tx command. When the Tx command is finished,
+ it jumps to the NoOp, when it loops until the next Tx command changes the
+ "link offset" in the NoOp. This way the 82586 never has to go through the
+ slow restart sequence.
+
+ The Rx buffer list is set up in the obvious ring structure. We have enough
+ memory (and low enough interrupt latency) that we can avoid the complicated
+ Rx buffer linked lists by alway associating a full-size Rx data buffer with
+ each Rx data frame.
+
+ I current use four transmit buffers starting at TX_BUF_START (0x0100), and
+ use the rest of memory, from RX_BUF_START to RX_BUF_END, for Rx buffers.
+
+ */
+
+static unsigned short init_words[] = {
+ /* System Configuration Pointer (SCP). */
+ 0x0000, /* Set bus size to 16 bits. */
+ 0,0, /* pad words. */
+ 0x0000,0x0000, /* ISCP phys addr, set in init_82586_mem(). */
+
+ /* Intermediate System Configuration Pointer (ISCP). */
+ 0x0001, /* Status word that's cleared when init is done. */
+ 0x0008,0,0, /* SCB offset, (skip, skip) */
+
+ /* System Control Block (SCB). */
+ 0,0xf000|RX_START|CUC_START, /* SCB status and cmd. */
+ CONFIG_CMD, /* Command list pointer, points to Configure. */
+ RX_BUF_START, /* Rx block list. */
+ 0,0,0,0, /* Error count: CRC, align, buffer, overrun. */
+
+ /* 0x0018: Configure command. Change to put MAC data with packet. */
+ 0, CmdConfigure, /* Status, command. */
+ SET_SA_CMD, /* Next command is Set Station Addr. */
+ 0x0804, /* "4" bytes of config data, 8 byte FIFO. */
+ 0x2e40, /* Magic values, including MAC data location. */
+ 0, /* Unused pad word. */
+
+ /* 0x0024: Setup station address command. */
+ 0, CmdSASetup,
+ SET_MC_CMD, /* Next command. */
+ 0xaa00,0xb000,0x0bad, /* Station address (to be filled in) */
+
+ /* 0x0030: NOP, looping back to itself. Point to first Tx buffer to Tx. */
+ 0, CmdNOp, IDLELOOP, 0 /* pad */,
+
+ /* 0x0038: A unused Time-Domain Reflectometer command. */
+ 0, CmdTDR, IDLELOOP, 0,
+
+ /* 0x0040: An unused Dump State command. */
+ 0, CmdDump, IDLELOOP, DUMP_DATA,
+
+ /* 0x0048: An unused Diagnose command. */
+ 0, CmdDiagnose, IDLELOOP,
+
+ /* 0x004E: An empty set-multicast-list command. */
+ 0, CmdMulticastList, IDLELOOP, 0,
+};
+
+/* Index to functions, as function prototypes. */
+
+static int el16_probe1(struct net_device *dev, int ioaddr);
+static int el16_open(struct net_device *dev);
+static int el16_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t el16_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void el16_rx(struct net_device *dev);
+static int el16_close(struct net_device *dev);
+static struct net_device_stats *el16_get_stats(struct net_device *dev);
+static void el16_tx_timeout (struct net_device *dev);
+
+static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad);
+static void init_82586_mem(struct net_device *dev);
+static struct ethtool_ops netdev_ethtool_ops;
+static void init_rx_bufs(struct net_device *);
+
+static int io = 0x300;
+static int irq;
+static int mem_start;
+
+
+/* Check for a network adaptor 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, (detachable devices only) allocate space for the
+ device and return success.
+ */
+
+struct net_device * __init el16_probe(int unit)
+{
+ struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+ static unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0};
+ unsigned *port;
+ int err = -ENODEV;
+
+ if (!dev)
+ return ERR_PTR(-ENODEV);
+
+ if (unit >= 0) {
+ sprintf(dev->name, "eth%d", unit);
+ netdev_boot_setup_check(dev);
+ io = dev->base_addr;
+ irq = dev->irq;
+ mem_start = dev->mem_start & 15;
+ }
+
+ SET_MODULE_OWNER(dev);
+
+ if (io > 0x1ff) /* Check a single specified location. */
+ err = el16_probe1(dev, io);
+ else if (io != 0)
+ err = -ENXIO; /* Don't probe at all. */
+ else {
+ for (port = ports; *port; port++) {
+ err = el16_probe1(dev, *port);
+ if (!err)
+ break;
+ }
+ }
+
+ if (err)
+ goto out;
+ err = register_netdev(dev);
+ if (err)
+ goto out1;
+ return dev;
+out1:
+ free_irq(dev->irq, dev);
+ iounmap(((struct net_local *)netdev_priv(dev))->base);
+ release_region(dev->base_addr, EL16_IO_EXTENT);
+out:
+ free_netdev(dev);
+ return ERR_PTR(err);
+}
+
+static int __init el16_probe1(struct net_device *dev, int ioaddr)
+{
+ static unsigned char init_ID_done, version_printed;
+ int i, irq, irqval, retval;
+ struct net_local *lp;
+
+ if (init_ID_done == 0) {
+ ushort lrs_state = 0xff;
+ /* Send the ID sequence to the ID_PORT to enable the board(s). */
+ outb(0x00, ID_PORT);
+ for(i = 0; i < 255; i++) {
+ outb(lrs_state, ID_PORT);
+ lrs_state <<= 1;
+ if (lrs_state & 0x100)
+ lrs_state ^= 0xe7;
+ }
+ outb(0x00, ID_PORT);
+ init_ID_done = 1;
+ }
+
+ if (!request_region(ioaddr, EL16_IO_EXTENT, DRV_NAME))
+ return -ENODEV;
+
+ if ((inb(ioaddr) != '*') || (inb(ioaddr + 1) != '3') ||
+ (inb(ioaddr + 2) != 'C') || (inb(ioaddr + 3) != 'O')) {
+ retval = -ENODEV;
+ goto out;
+ }
+
+ if (net_debug && version_printed++ == 0)
+ printk(version);
+
+ printk("%s: 3c507 at %#x,", dev->name, ioaddr);
+
+ /* We should make a few more checks here, like the first three octets of
+ the S.A. for the manufacturer's code. */
+
+ irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
+
+ irqval = request_irq(irq, &el16_interrupt, 0, DRV_NAME, dev);
+ if (irqval) {
+ printk(KERN_ERR "3c507: unable to get IRQ %d (irqval=%d).\n", irq, irqval);
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ /* We've committed to using the board, and can start filling in *dev. */
+ dev->base_addr = ioaddr;
+
+ outb(0x01, ioaddr + MISC_CTRL);
+ for (i = 0; i < 6; i++) {
+ dev->dev_addr[i] = inb(ioaddr + i);
+ printk(" %02x", dev->dev_addr[i]);
+ }
+
+ if (mem_start)
+ net_debug = mem_start & 7;
+
+#ifdef MEM_BASE
+ dev->mem_start = MEM_BASE;
+ dev->mem_end = dev->mem_start + 0x10000;
+#else
+ {
+ int base;
+ int size;
+ char mem_config = inb(ioaddr + MEM_CONFIG);
+ if (mem_config & 0x20) {
+ size = 64*1024;
+ base = 0xf00000 + (mem_config & 0x08 ? 0x080000
+ : ((mem_config & 3) << 17));
+ } else {
+ size = ((mem_config & 3) + 1) << 14;
+ base = 0x0c0000 + ( (mem_config & 0x18) << 12);
+ }
+ dev->mem_start = base;
+ dev->mem_end = base + size;
+ }
+#endif
+
+ dev->if_port = (inb(ioaddr + ROM_CONFIG) & 0x80) ? 1 : 0;
+ dev->irq = inb(ioaddr + IRQ_CONFIG) & 0x0f;
+
+ printk(", IRQ %d, %sternal xcvr, memory %#lx-%#lx.\n", dev->irq,
+ dev->if_port ? "ex" : "in", dev->mem_start, dev->mem_end-1);
+
+ if (net_debug)
+ printk(version);
+
+ lp = netdev_priv(dev);
+ memset(lp, 0, sizeof(*lp));
+ spin_lock_init(&lp->lock);
+ lp->base = ioremap(dev->mem_start, RX_BUF_END);
+ if (!lp->base) {
+ printk(KERN_ERR "3c507: unable to remap memory\n");
+ retval = -EAGAIN;
+ goto out1;
+ }
+
+ dev->open = el16_open;
+ dev->stop = el16_close;
+ dev->hard_start_xmit = el16_send_packet;
+ dev->get_stats = el16_get_stats;
+ dev->tx_timeout = el16_tx_timeout;
+ dev->watchdog_timeo = TX_TIMEOUT;
+ dev->ethtool_ops = &netdev_ethtool_ops;
+ dev->flags &= ~IFF_MULTICAST; /* Multicast doesn't work */
+ return 0;
+out1:
+ free_irq(dev->irq, dev);
+out:
+ release_region(ioaddr, EL16_IO_EXTENT);
+ return retval;
+}
+
+static int el16_open(struct net_device *dev)
+{
+ /* Initialize the 82586 memory and start it. */
+ init_82586_mem(dev);
+
+ netif_start_queue(dev);
+ return 0;
+}
+
+
+static void el16_tx_timeout (struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ void __iomem *shmem = lp->base;
+
+ if (net_debug > 1)
+ printk ("%s: transmit timed out, %s? ", dev->name,
+ readw(shmem + iSCB_STATUS) & 0x8000 ? "IRQ conflict" :
+ "network cable problem");
+ /* Try to restart the adaptor. */
+ if (lp->last_restart == lp->stats.tx_packets) {
+ if (net_debug > 1)
+ printk ("Resetting board.\n");
+ /* Completely reset the adaptor. */
+ init_82586_mem (dev);
+ lp->tx_pkts_in_ring = 0;
+ } else {
+ /* Issue the channel attention signal and hope it "gets better". */
+ if (net_debug > 1)
+ printk ("Kicking board.\n");
+ writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD);
+ outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
+ lp->last_restart = lp->stats.tx_packets;
+ }
+ dev->trans_start = jiffies;
+ netif_wake_queue (dev);
+}
+
+
+static int el16_send_packet (struct sk_buff *skb, struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ unsigned long flags;
+ short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+ unsigned char *buf = skb->data;
+
+ netif_stop_queue (dev);
+
+ spin_lock_irqsave (&lp->lock, flags);
+
+ lp->stats.tx_bytes += length;
+ /* Disable the 82586's input to the interrupt line. */
+ outb (0x80, ioaddr + MISC_CTRL);
+
+ hardware_send_packet (dev, buf, skb->len, length - skb->len);
+
+ dev->trans_start = jiffies;
+ /* Enable the 82586 interrupt input. */
+ outb (0x84, ioaddr + MISC_CTRL);
+
+ spin_unlock_irqrestore (&lp->lock, flags);
+
+ dev_kfree_skb (skb);
+
+ /* You might need to clean up and record Tx statistics here. */
+
+ return 0;
+}
+
+/* The typical workload of the driver:
+ Handle the network interface interrupts. */
+static irqreturn_t el16_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct net_device *dev = dev_id;
+ struct net_local *lp;
+ int ioaddr, status, boguscount = 0;
+ ushort ack_cmd = 0;
+ void __iomem *shmem;
+
+ if (dev == NULL) {
+ printk ("net_interrupt(): irq %d for unknown device.\n", irq);
+ return IRQ_NONE;
+ }
+
+ ioaddr = dev->base_addr;
+ lp = netdev_priv(dev);
+ shmem = lp->base;
+
+ spin_lock(&lp->lock);
+
+ status = readw(shmem+iSCB_STATUS);
+
+ if (net_debug > 4) {
+ printk("%s: 3c507 interrupt, status %4.4x.\n", dev->name, status);
+ }
+
+ /* Disable the 82586's input to the interrupt line. */
+ outb(0x80, ioaddr + MISC_CTRL);
+
+ /* Reap the Tx packet buffers. */
+ while (lp->tx_pkts_in_ring) {
+ unsigned short tx_status = readw(shmem+lp->tx_reap);
+ if (!(tx_status & 0x8000)) {
+ if (net_debug > 5)
+ printk("Tx command incomplete (%#x).\n", lp->tx_reap);
+ break;
+ }
+ /* Tx unsuccessful or some interesting status bit set. */
+ if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) {
+ lp->stats.tx_errors++;
+ if (tx_status & 0x0600) lp->stats.tx_carrier_errors++;
+ if (tx_status & 0x0100) lp->stats.tx_fifo_errors++;
+ if (!(tx_status & 0x0040)) lp->stats.tx_heartbeat_errors++;
+ if (tx_status & 0x0020) lp->stats.tx_aborted_errors++;
+ lp->stats.collisions += tx_status & 0xf;
+ }
+ lp->stats.tx_packets++;
+ if (net_debug > 5)
+ printk("Reaped %x, Tx status %04x.\n" , lp->tx_reap, tx_status);
+ lp->tx_reap += TX_BUF_SIZE;
+ if (lp->tx_reap > RX_BUF_START - TX_BUF_SIZE)
+ lp->tx_reap = TX_BUF_START;
+
+ lp->tx_pkts_in_ring--;
+ /* There is always more space in the Tx ring buffer now. */
+ netif_wake_queue(dev);
+
+ if (++boguscount > 10)
+ break;
+ }
+
+ if (status & 0x4000) { /* Packet received. */
+ if (net_debug > 5)
+ printk("Received packet, rx_head %04x.\n", lp->rx_head);
+ el16_rx(dev);
+ }
+
+ /* Acknowledge the interrupt sources. */
+ ack_cmd = status & 0xf000;
+
+ if ((status & 0x0700) != 0x0200 && netif_running(dev)) {
+ if (net_debug)
+ printk("%s: Command unit stopped, status %04x, restarting.\n",
+ dev->name, status);
+ /* If this ever occurs we should really re-write the idle loop, reset
+ the Tx list, and do a complete restart of the command unit.
+ For now we rely on the Tx timeout if the resume doesn't work. */
+ ack_cmd |= CUC_RESUME;
+ }
+
+ if ((status & 0x0070) != 0x0040 && netif_running(dev)) {
+ /* The Rx unit is not ready, it must be hung. Restart the receiver by
+ initializing the rx buffers, and issuing an Rx start command. */
+ if (net_debug)
+ printk("%s: Rx unit stopped, status %04x, restarting.\n",
+ dev->name, status);
+ init_rx_bufs(dev);
+ writew(RX_BUF_START,shmem+iSCB_RFA);
+ ack_cmd |= RX_START;
+ }
+
+ writew(ack_cmd,shmem+iSCB_CMD);
+ outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */
+
+ /* Clear the latched interrupt. */
+ outb(0, ioaddr + RESET_IRQ);
+
+ /* Enable the 82586's interrupt input. */
+ outb(0x84, ioaddr + MISC_CTRL);
+ spin_unlock(&lp->lock);
+ return IRQ_HANDLED;
+}
+
+static int el16_close(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ int ioaddr = dev->base_addr;
+ void __iomem *shmem = lp->base;
+
+ netif_stop_queue(dev);
+
+ /* Flush the Tx and disable Rx. */
+ writew(RX_SUSPEND | CUC_SUSPEND,shmem+iSCB_CMD);
+ outb(0, ioaddr + SIGNAL_CA);
+
+ /* Disable the 82586's input to the interrupt line. */
+ outb(0x80, ioaddr + MISC_CTRL);
+
+ /* We always physically use the IRQ line, so we don't do free_irq(). */
+
+ /* Update the statistics here. */
+
+ return 0;
+}
+
+/* Get the current statistics. This may be called with the card open or
+ closed. */
+static struct net_device_stats *el16_get_stats(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+
+ /* ToDo: decide if there are any useful statistics from the SCB. */
+
+ return &lp->stats;
+}
+
+/* Initialize the Rx-block list. */
+static void init_rx_bufs(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ void __iomem *write_ptr;
+ unsigned short SCB_base = SCB_BASE;
+
+ int cur_rxbuf = lp->rx_head = RX_BUF_START;
+
+ /* Initialize each Rx frame + data buffer. */
+ do { /* While there is room for one more. */
+
+ write_ptr = lp->base + cur_rxbuf;
+
+ writew(0x0000,write_ptr); /* Status */
+ writew(0x0000,write_ptr+=2); /* Command */
+ writew(cur_rxbuf + RX_BUF_SIZE,write_ptr+=2); /* Link */
+ writew(cur_rxbuf + 22,write_ptr+=2); /* Buffer offset */
+ writew(0x0000,write_ptr+=2); /* Pad for dest addr. */
+ writew(0x0000,write_ptr+=2);
+ writew(0x0000,write_ptr+=2);
+ writew(0x0000,write_ptr+=2); /* Pad for source addr. */
+ writew(0x0000,write_ptr+=2);
+ writew(0x0000,write_ptr+=2);
+ writew(0x0000,write_ptr+=2); /* Pad for protocol. */
+
+ writew(0x0000,write_ptr+=2); /* Buffer: Actual count */
+ writew(-1,write_ptr+=2); /* Buffer: Next (none). */
+ writew(cur_rxbuf + 0x20 + SCB_base,write_ptr+=2);/* Buffer: Address low */
+ writew(0x0000,write_ptr+=2);
+ /* Finally, the number of bytes in the buffer. */
+ writew(0x8000 + RX_BUF_SIZE-0x20,write_ptr+=2);
+
+ lp->rx_tail = cur_rxbuf;
+ cur_rxbuf += RX_BUF_SIZE;
+ } while (cur_rxbuf <= RX_BUF_END - RX_BUF_SIZE);
+
+ /* Terminate the list by setting the EOL bit, and wrap the pointer to make
+ the list a ring. */
+ write_ptr = lp->base + lp->rx_tail + 2;
+ writew(0xC000,write_ptr); /* Command, mark as last. */
+ writew(lp->rx_head,write_ptr+2); /* Link */
+}
+
+static void init_82586_mem(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ short ioaddr = dev->base_addr;
+ void __iomem *shmem = lp->base;
+
+ /* Enable loopback to protect the wire while starting up,
+ and hold the 586 in reset during the memory initialization. */
+ outb(0x20, ioaddr + MISC_CTRL);
+
+ /* Fix the ISCP address and base. */
+ init_words[3] = SCB_BASE;
+ init_words[7] = SCB_BASE;
+
+ /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */
+ memcpy_toio(lp->base + RX_BUF_END - 10, init_words, 10);
+
+ /* Write the words at 0x0000. */
+ memcpy_toio(lp->base, init_words + 5, sizeof(init_words) - 10);
+
+ /* Fill in the station address. */
+ memcpy_toio(lp->base+SA_OFFSET, dev->dev_addr,
+ sizeof(dev->dev_addr));
+
+ /* The Tx-block list is written as needed. We just set up the values. */
+ lp->tx_cmd_link = IDLELOOP + 4;
+ lp->tx_head = lp->tx_reap = TX_BUF_START;
+
+ init_rx_bufs(dev);
+
+ /* Start the 586 by releasing the reset line, but leave loopback. */
+ outb(0xA0, ioaddr + MISC_CTRL);
+
+ /* This was time consuming to track down: you need to give two channel
+ attention signals to reliably start up the i82586. */
+ outb(0, ioaddr + SIGNAL_CA);
+
+ {
+ int boguscnt = 50;
+ while (readw(shmem+iSCB_STATUS) == 0)
+ if (--boguscnt == 0) {
+ printk("%s: i82586 initialization timed out with status %04x,"
+ "cmd %04x.\n", dev->name,
+ readw(shmem+iSCB_STATUS), readw(shmem+iSCB_CMD));
+ break;
+ }
+ /* Issue channel-attn -- the 82586 won't start. */
+ outb(0, ioaddr + SIGNAL_CA);
+ }
+
+ /* Disable loopback and enable interrupts. */
+ outb(0x84, ioaddr + MISC_CTRL);
+ if (net_debug > 4)
+ printk("%s: Initialized 82586, status %04x.\n", dev->name,
+ readw(shmem+iSCB_STATUS));
+ return;
+}
+
+static void hardware_send_packet(struct net_device *dev, void *buf, short length, short pad)
+{
+ struct net_local *lp = netdev_priv(dev);
+ short ioaddr = dev->base_addr;
+ ushort tx_block = lp->tx_head;
+ void __iomem *write_ptr = lp->base + tx_block;
+ static char padding[ETH_ZLEN];
+
+ /* Set the write pointer to the Tx block, and put out the header. */
+ writew(0x0000,write_ptr); /* Tx status */
+ writew(CMD_INTR|CmdTx,write_ptr+=2); /* Tx command */
+ writew(tx_block+16,write_ptr+=2); /* Next command is a NoOp. */
+ writew(tx_block+8,write_ptr+=2); /* Data Buffer offset. */
+
+ /* Output the data buffer descriptor. */
+ writew((pad + length) | 0x8000,write_ptr+=2); /* Byte count parameter. */
+ writew(-1,write_ptr+=2); /* No next data buffer. */
+ writew(tx_block+22+SCB_BASE,write_ptr+=2); /* Buffer follows the NoOp command. */
+ writew(0x0000,write_ptr+=2); /* Buffer address high bits (always zero). */
+
+ /* Output the Loop-back NoOp command. */
+ writew(0x0000,write_ptr+=2); /* Tx status */
+ writew(CmdNOp,write_ptr+=2); /* Tx command */
+ writew(tx_block+16,write_ptr+=2); /* Next is myself. */
+
+ /* Output the packet at the write pointer. */
+ memcpy_toio(write_ptr+2, buf, length);
+ if (pad)
+ memcpy_toio(write_ptr+length+2, padding, pad);
+
+ /* Set the old command link pointing to this send packet. */
+ writew(tx_block,lp->base + lp->tx_cmd_link);
+ lp->tx_cmd_link = tx_block + 20;
+
+ /* Set the next free tx region. */
+ lp->tx_head = tx_block + TX_BUF_SIZE;
+ if (lp->tx_head > RX_BUF_START - TX_BUF_SIZE)
+ lp->tx_head = TX_BUF_START;
+
+ if (net_debug > 4) {
+ printk("%s: 3c507 @%x send length = %d, tx_block %3x, next %3x.\n",
+ dev->name, ioaddr, length, tx_block, lp->tx_head);
+ }
+
+ /* Grimly block further packets if there has been insufficient reaping. */
+ if (++lp->tx_pkts_in_ring < NUM_TX_BUFS)
+ netif_wake_queue(dev);
+}
+
+static void el16_rx(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ void __iomem *shmem = lp->base;
+ ushort rx_head = lp->rx_head;
+ ushort rx_tail = lp->rx_tail;
+ ushort boguscount = 10;
+ short frame_status;
+
+ while ((frame_status = readw(shmem+rx_head)) < 0) { /* Command complete */
+ void __iomem *read_frame = lp->base + rx_head;
+ ushort rfd_cmd = readw(read_frame+2);
+ ushort next_rx_frame = readw(read_frame+4);
+ ushort data_buffer_addr = readw(read_frame+6);
+ void __iomem *data_frame = lp->base + data_buffer_addr;
+ ushort pkt_len = readw(data_frame);
+
+ if (rfd_cmd != 0 || data_buffer_addr != rx_head + 22
+ || (pkt_len & 0xC000) != 0xC000) {
+ printk("%s: Rx frame at %#x corrupted, status %04x cmd %04x"
+ "next %04x data-buf @%04x %04x.\n", dev->name, rx_head,
+ frame_status, rfd_cmd, next_rx_frame, data_buffer_addr,
+ pkt_len);
+ } else if ((frame_status & 0x2000) == 0) {
+ /* Frame Rxed, but with error. */
+ lp->stats.rx_errors++;
+ if (frame_status & 0x0800) lp->stats.rx_crc_errors++;
+ if (frame_status & 0x0400) lp->stats.rx_frame_errors++;
+ if (frame_status & 0x0200) lp->stats.rx_fifo_errors++;
+ if (frame_status & 0x0100) lp->stats.rx_over_errors++;
+ if (frame_status & 0x0080) lp->stats.rx_length_errors++;
+ } else {
+ /* Malloc up new buffer. */
+ struct sk_buff *skb;
+
+ pkt_len &= 0x3fff;
+ skb = dev_alloc_skb(pkt_len+2);
+ if (skb == NULL) {
+ printk("%s: Memory squeeze, dropping packet.\n", dev->name);
+ lp->stats.rx_dropped++;
+ break;
+ }
+
+ skb_reserve(skb,2);
+ skb->dev = dev;
+
+ /* 'skb->data' points to the start of sk_buff data area. */
+ memcpy_fromio(skb_put(skb,pkt_len), data_frame + 10, pkt_len);
+
+ skb->protocol=eth_type_trans(skb,dev);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes += pkt_len;
+ }
+
+ /* Clear the status word and set End-of-List on the rx frame. */
+ writew(0,read_frame);
+ writew(0xC000,read_frame+2);
+ /* Clear the end-of-list on the prev. RFD. */
+ writew(0x0000,lp->base + rx_tail + 2);
+
+ rx_tail = rx_head;
+ rx_head = next_rx_frame;
+ if (--boguscount == 0)
+ break;
+ }
+
+ lp->rx_head = rx_head;
+ lp->rx_tail = rx_tail;
+}
+
+static void netdev_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strcpy(info->driver, DRV_NAME);
+ strcpy(info->version, DRV_VERSION);
+ sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
+}
+
+static u32 netdev_get_msglevel(struct net_device *dev)
+{
+ return debug;
+}
+
+static void netdev_set_msglevel(struct net_device *dev, u32 level)
+{
+ debug = level;
+}
+
+static struct ethtool_ops netdev_ethtool_ops = {
+ .get_drvinfo = netdev_get_drvinfo,
+ .get_msglevel = netdev_get_msglevel,
+ .set_msglevel = netdev_set_msglevel,
+};
+
+#ifdef MODULE
+static struct net_device *dev_3c507;
+module_param(io, int, 0);
+module_param(irq, int, 0);
+MODULE_PARM_DESC(io, "EtherLink16 I/O base address");
+MODULE_PARM_DESC(irq, "(ignored)");
+
+int init_module(void)
+{
+ if (io == 0)
+ printk("3c507: You should not use auto-probing with insmod!\n");
+ dev_3c507 = el16_probe(-1);
+ return IS_ERR(dev_3c507) ? PTR_ERR(dev_3c507) : 0;
+}
+
+void
+cleanup_module(void)
+{
+ struct net_device *dev = dev_3c507;
+ unregister_netdev(dev);
+ free_irq(dev->irq, dev);
+ iounmap(((struct net_local *)netdev_priv(dev))->base);
+ release_region(dev->base_addr, EL16_IO_EXTENT);
+ free_netdev(dev);
+}
+#endif /* MODULE */
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Local variables:
+ * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -I/usr/src/linux/drivers/net -Wall -Wstrict-prototypes -O6 -m486 -c 3c507.c"
+ * version-control: t
+ * kept-new-versions: 5
+ * tab-width: 4
+ * c-indent-level: 4
+ * End:
+ */