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Diffstat (limited to 'linux/src/drivers/net/3c507.c')
-rw-r--r-- | linux/src/drivers/net/3c507.c | 923 |
1 files changed, 923 insertions, 0 deletions
diff --git a/linux/src/drivers/net/3c507.c b/linux/src/drivers/net/3c507.c new file mode 100644 index 0000000..6005487 --- /dev/null +++ b/linux/src/drivers/net/3c507.c @@ -0,0 +1,923 @@ +/* 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 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 + + 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. +*/ + +static const char *version = + "3c507.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n"; + + +#include <linux/module.h> + +/* + 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/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/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 <linux/malloc.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; + +/* A zero-terminated list of common I/O addresses to be probed. */ +static unsigned int netcard_portlist[] = + { 0x300, 0x320, 0x340, 0x280, 0}; + +/* + 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 enet_statistics stats; + int last_restart; + ushort rx_head; + ushort rx_tail; + ushort tx_head; + ushort tx_cmd_link; + ushort tx_reap; +}; + +/* + 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 4 +#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) + +/* + 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. + + */ + +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. */ + +extern int el16_probe(struct device *dev); /* Called from Space.c */ + +static int el16_probe1(struct device *dev, int ioaddr); +static int el16_open(struct device *dev); +static int el16_send_packet(struct sk_buff *skb, struct device *dev); +static void el16_interrupt(int irq, void *dev_id, struct pt_regs *regs); +static void el16_rx(struct device *dev); +static int el16_close(struct device *dev); +static struct enet_statistics *el16_get_stats(struct device *dev); + +static void hardware_send_packet(struct device *dev, void *buf, short length); +void init_82586_mem(struct device *dev); + + +#ifdef HAVE_DEVLIST +struct netdev_entry netcard_drv = +{"3c507", el16_probe1, EL16_IO_EXTENT, netcard_portlist}; +#endif + +/* 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. + */ +int +el16_probe(struct device *dev) +{ + int base_addr = dev ? dev->base_addr : 0; + int i; + + if (base_addr > 0x1ff) /* Check a single specified location. */ + return el16_probe1(dev, base_addr); + else if (base_addr != 0) + return ENXIO; /* Don't probe at all. */ + + for (i = 0; netcard_portlist[i]; i++) { + int ioaddr = netcard_portlist[i]; + if (check_region(ioaddr, EL16_IO_EXTENT)) + continue; + if (el16_probe1(dev, ioaddr) == 0) + return 0; + } + + return ENODEV; +} + +int el16_probe1(struct device *dev, int ioaddr) +{ + static unsigned char init_ID_done = 0, version_printed = 0; + int i, irq, irqval; + + 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 (inb(ioaddr) == '*' && inb(ioaddr+1) == '3' + && inb(ioaddr+2) == 'C' && inb(ioaddr+3) == 'O') + ; + else + return ENODEV; + + /* Allocate a new 'dev' if needed. */ + if (dev == NULL) + dev = init_etherdev(0, sizeof(struct net_local)); + + 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, "3c507", NULL); + if (irqval) { + printk ("unable to get IRQ %d (irqval=%d).\n", irq, irqval); + return EAGAIN; + } + + /* We've committed to using the board, and can start filling in *dev. */ + request_region(ioaddr, EL16_IO_EXTENT, "3c507"); + 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 ((dev->mem_start & 0xf) > 0) + net_debug = dev->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); + + /* Initialize the device structure. */ + dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL); + if (dev->priv == NULL) + return -ENOMEM; + memset(dev->priv, 0, sizeof(struct net_local)); + + dev->open = el16_open; + dev->stop = el16_close; + dev->hard_start_xmit = el16_send_packet; + dev->get_stats = el16_get_stats; + + ether_setup(dev); /* Generic ethernet behaviour */ + + dev->flags&=~IFF_MULTICAST; /* Multicast doesn't work */ + + return 0; +} + + + +static int +el16_open(struct device *dev) +{ + irq2dev_map[dev->irq] = dev; + + /* Initialize the 82586 memory and start it. */ + init_82586_mem(dev); + + dev->tbusy = 0; + dev->interrupt = 0; + dev->start = 1; + + MOD_INC_USE_COUNT; + + return 0; +} + +static int +el16_send_packet(struct sk_buff *skb, struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + int ioaddr = dev->base_addr; + short *shmem = (short*)dev->mem_start; + + 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; + if (net_debug > 1) + printk("%s: transmit timed out, %s? ", dev->name, + shmem[iSCB_STATUS>>1] & 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); + } else { + /* Issue the channel attention signal and hope it "gets better". */ + if (net_debug > 1) printk("Kicking board.\n"); + shmem[iSCB_CMD>>1] = 0xf000|CUC_START|RX_START; + outb(0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */ + lp->last_restart = lp->stats.tx_packets; + } + 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. */ + 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; + + /* Disable the 82586's input to the interrupt line. */ + outb(0x80, ioaddr + MISC_CTRL); + hardware_send_packet(dev, buf, length); + dev->trans_start = jiffies; + /* Enable the 82586 interrupt input. */ + outb(0x84, ioaddr + MISC_CTRL); + } + + dev_kfree_skb (skb, FREE_WRITE); + + /* 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 void +el16_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct device *dev = (struct device *)(irq2dev_map[irq]); + struct net_local *lp; + int ioaddr, status, boguscount = 0; + ushort ack_cmd = 0; + ushort *shmem; + + if (dev == NULL) { + printk ("net_interrupt(): irq %d for unknown device.\n", irq); + return; + } + dev->interrupt = 1; + + ioaddr = dev->base_addr; + lp = (struct net_local *)dev->priv; + shmem = ((ushort*)dev->mem_start); + + status = shmem[iSCB_STATUS>>1]; + + 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_reap != lp->tx_head) { + unsigned short tx_status = shmem[lp->tx_reap>>1]; + + if (tx_status == 0) { + if (net_debug > 5) printk("Couldn't reap %#x.\n", lp->tx_reap); + break; + } + if (tx_status & 0x2000) { + lp->stats.tx_packets++; + lp->stats.collisions += tx_status & 0xf; + dev->tbusy = 0; + mark_bh(NET_BH); /* Inform upper layers. */ + } else { + 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++; + } + 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; + if (++boguscount > 4) + 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 && dev->start) { + 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 && dev->start) { + static void init_rx_bufs(struct device *); + /* 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); + shmem[iSCB_RFA >> 1] = RX_BUF_START; + ack_cmd |= RX_START; + } + + shmem[iSCB_CMD>>1] = ack_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); + + return; +} + +static int +el16_close(struct device *dev) +{ + int ioaddr = dev->base_addr; + ushort *shmem = (short*)dev->mem_start; + + dev->tbusy = 1; + dev->start = 0; + + /* Flush the Tx and disable Rx. */ + shmem[iSCB_CMD >> 1] = RX_SUSPEND | CUC_SUSPEND; + 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(). + We do remove ourselves from the map. */ + + irq2dev_map[dev->irq] = 0; + + /* Update the statistics here. */ + + MOD_DEC_USE_COUNT; + + return 0; +} + +/* Get the current statistics. This may be called with the card open or + closed. */ +static struct enet_statistics * +el16_get_stats(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + + /* 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 device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + unsigned short *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 = (unsigned short *)(dev->mem_start + cur_rxbuf); + + *write_ptr++ = 0x0000; /* Status */ + *write_ptr++ = 0x0000; /* Command */ + *write_ptr++ = cur_rxbuf + RX_BUF_SIZE; /* Link */ + *write_ptr++ = cur_rxbuf + 22; /* Buffer offset */ + *write_ptr++ = 0x0000; /* Pad for dest addr. */ + *write_ptr++ = 0x0000; + *write_ptr++ = 0x0000; + *write_ptr++ = 0x0000; /* Pad for source addr. */ + *write_ptr++ = 0x0000; + *write_ptr++ = 0x0000; + *write_ptr++ = 0x0000; /* Pad for protocol. */ + + *write_ptr++ = 0x0000; /* Buffer: Actual count */ + *write_ptr++ = -1; /* Buffer: Next (none). */ + *write_ptr++ = cur_rxbuf + 0x20 + SCB_base; /* Buffer: Address low */ + *write_ptr++ = 0x0000; + /* Finally, the number of bytes in the buffer. */ + *write_ptr++ = 0x8000 + RX_BUF_SIZE-0x20; + + 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 = (unsigned short *) + (dev->mem_start + lp->rx_tail + 2); + *write_ptr++ = 0xC000; /* Command, mark as last. */ + *write_ptr++ = lp->rx_head; /* Link */ + +} + +void +init_82586_mem(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + short ioaddr = dev->base_addr; + ushort *shmem = (short*)dev->mem_start; + + /* 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((void*)dev->mem_end-10, init_words, 10); + + /* Write the words at 0x0000. */ + memcpy((char*)dev->mem_start, init_words + 5, sizeof(init_words) - 10); + + /* Fill in the station address. */ + memcpy((char*)dev->mem_start+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 (shmem[iSCB_STATUS>>1] == 0) + if (--boguscnt == 0) { + printk("%s: i82586 initialization timed out with status %04x," + "cmd %04x.\n", dev->name, + shmem[iSCB_STATUS>>1], shmem[iSCB_CMD>>1]); + 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, + shmem[iSCB_STATUS>>1]); + return; +} + +static void +hardware_send_packet(struct device *dev, void *buf, short length) +{ + struct net_local *lp = (struct net_local *)dev->priv; + short ioaddr = dev->base_addr; + ushort tx_block = lp->tx_head; + ushort *write_ptr = (ushort *)(dev->mem_start + tx_block); + + /* Set the write pointer to the Tx block, and put out the header. */ + *write_ptr++ = 0x0000; /* Tx status */ + *write_ptr++ = CMD_INTR|CmdTx; /* Tx command */ + *write_ptr++ = tx_block+16; /* Next command is a NoOp. */ + *write_ptr++ = tx_block+8; /* Data Buffer offset. */ + + /* Output the data buffer descriptor. */ + *write_ptr++ = length | 0x8000; /* Byte count parameter. */ + *write_ptr++ = -1; /* No next data buffer. */ + *write_ptr++ = tx_block+22+SCB_BASE;/* Buffer follows the NoOp command. */ + *write_ptr++ = 0x0000; /* Buffer address high bits (always zero). */ + + /* Output the Loop-back NoOp command. */ + *write_ptr++ = 0x0000; /* Tx status */ + *write_ptr++ = CmdNOp; /* Tx command */ + *write_ptr++ = tx_block+16; /* Next is myself. */ + + /* Output the packet at the write pointer. */ + memcpy(write_ptr, buf, length); + + /* Set the old command link pointing to this send packet. */ + *(ushort*)(dev->mem_start + lp->tx_cmd_link) = tx_block; + 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); + } + + if (lp->tx_head != lp->tx_reap) + dev->tbusy = 0; +} + +static void +el16_rx(struct device *dev) +{ + struct net_local *lp = (struct net_local *)dev->priv; + short *shmem = (short*)dev->mem_start; + ushort rx_head = lp->rx_head; + ushort rx_tail = lp->rx_tail; + ushort boguscount = 10; + short frame_status; + + while ((frame_status = shmem[rx_head>>1]) < 0) { /* Command complete */ + ushort *read_frame = (short *)(dev->mem_start + rx_head); + ushort rfd_cmd = read_frame[1]; + ushort next_rx_frame = read_frame[2]; + ushort data_buffer_addr = read_frame[3]; + ushort *data_frame = (short *)(dev->mem_start + data_buffer_addr); + ushort pkt_len = data_frame[0]; + + 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(skb_put(skb,pkt_len), data_frame + 5, pkt_len); + + skb->protocol=eth_type_trans(skb,dev); + netif_rx(skb); + lp->stats.rx_packets++; + } + + /* Clear the status word and set End-of-List on the rx frame. */ + read_frame[0] = 0; + read_frame[1] = 0xC000; + /* Clear the end-of-list on the prev. RFD. */ + *(short*)(dev->mem_start + rx_tail + 2) = 0x0000; + + rx_tail = rx_head; + rx_head = next_rx_frame; + if (--boguscount == 0) + break; + } + + lp->rx_head = rx_head; + lp->rx_tail = rx_tail; +} +#ifdef MODULE +static char devicename[9] = { 0, }; +static struct device dev_3c507 = { + devicename, /* device name is inserted by linux/drivers/net/net_init.c */ + 0, 0, 0, 0, + 0, 0, + 0, 0, 0, NULL, el16_probe +}; + +static int io = 0x300; +static int irq = 0; + +int init_module(void) +{ + if (io == 0) + printk("3c507: You should not use auto-probing with insmod!\n"); + dev_3c507.base_addr = io; + dev_3c507.irq = irq; + if (register_netdev(&dev_3c507) != 0) { + printk("3c507: register_netdev() returned non-zero.\n"); + return -EIO; + } + return 0; +} + +void +cleanup_module(void) +{ + unregister_netdev(&dev_3c507); + kfree(dev_3c507.priv); + dev_3c507.priv = NULL; + + /* If we don't do this, we can't re-insmod it later. */ + free_irq(dev_3c507.irq, NULL); + release_region(dev_3c507.base_addr, EL16_IO_EXTENT); +} +#endif /* MODULE */ + +/* + * 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: + */ |