diff options
Diffstat (limited to 'drivers/net/ethernet/i825xx/3c507.c')
| -rw-r--r-- | drivers/net/ethernet/i825xx/3c507.c | 939 |
1 files changed, 939 insertions, 0 deletions
diff --git a/drivers/net/ethernet/i825xx/3c507.c b/drivers/net/ethernet/i825xx/3c507.c new file mode 100644 index 000000000000..1e945551c144 --- /dev/null +++ b/drivers/net/ethernet/i825xx/3c507.c @@ -0,0 +1,939 @@ +/* 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/if_ether.h> +#include <linux/skbuff.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 { + 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 (HZ/20) + +/* + 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 netdev_tx_t el16_send_packet(struct sk_buff *skb, + struct net_device *dev); +static irqreturn_t el16_interrupt(int irq, void *dev_id); +static void el16_rx(struct net_device *dev); +static int el16_close(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 const 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 const unsigned ports[] = { 0x300, 0x320, 0x340, 0x280, 0}; + const 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; + } + + 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 const struct net_device_ops netdev_ops = { + .ndo_open = el16_open, + .ndo_stop = el16_close, + .ndo_start_xmit = el16_send_packet, + .ndo_tx_timeout = el16_tx_timeout, + .ndo_change_mtu = eth_change_mtu, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +static int __init el16_probe1(struct net_device *dev, int ioaddr) +{ + static unsigned char init_ID_done; + 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; + } + + pr_info("%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) { + pr_cont("\n"); + pr_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); + pr_cont(" %pM", dev->dev_addr); + + 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; + + pr_cont(", 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) + pr_debug("%s", version); + + lp = netdev_priv(dev); + spin_lock_init(&lp->lock); + lp->base = ioremap(dev->mem_start, RX_BUF_END); + if (!lp->base) { + pr_err("3c507: unable to remap memory\n"); + retval = -EAGAIN; + goto out1; + } + + dev->netdev_ops = &netdev_ops; + 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) + pr_debug("%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 == dev->stats.tx_packets) { + if (net_debug > 1) + pr_cont("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) + pr_cont("Kicking board.\n"); + writew(0xf000 | CUC_START | RX_START, shmem + iSCB_CMD); + outb (0, ioaddr + SIGNAL_CA); /* Issue channel-attn. */ + lp->last_restart = dev->stats.tx_packets; + } + dev->trans_start = jiffies; /* prevent tx timeout */ + netif_wake_queue (dev); +} + + +static netdev_tx_t 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); + + dev->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); + + /* 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 NETDEV_TX_OK; +} + +/* The typical workload of the driver: + Handle the network interface interrupts. */ +static irqreturn_t el16_interrupt(int irq, void *dev_id) +{ + 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) { + pr_err("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) { + pr_debug("%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) + pr_debug("Tx command incomplete (%#x).\n", lp->tx_reap); + break; + } + /* Tx unsuccessful or some interesting status bit set. */ + if (!(tx_status & 0x2000) || (tx_status & 0x0f3f)) { + dev->stats.tx_errors++; + if (tx_status & 0x0600) dev->stats.tx_carrier_errors++; + if (tx_status & 0x0100) dev->stats.tx_fifo_errors++; + if (!(tx_status & 0x0040)) dev->stats.tx_heartbeat_errors++; + if (tx_status & 0x0020) dev->stats.tx_aborted_errors++; + dev->stats.collisions += tx_status & 0xf; + } + dev->stats.tx_packets++; + if (net_debug > 5) + pr_debug("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) + pr_debug("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) + pr_debug("%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) + pr_debug("%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; +} + +/* 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, ETH_ALEN); + + /* 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) { + pr_warning("%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) + pr_debug("%s: Initialized 82586, status %04x.\n", dev->name, + readw(shmem+iSCB_STATUS)); +} + +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) { + pr_debug("%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) { + pr_err("%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. */ + dev->stats.rx_errors++; + if (frame_status & 0x0800) dev->stats.rx_crc_errors++; + if (frame_status & 0x0400) dev->stats.rx_frame_errors++; + if (frame_status & 0x0200) dev->stats.rx_fifo_errors++; + if (frame_status & 0x0100) dev->stats.rx_over_errors++; + if (frame_status & 0x0080) dev->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) { + pr_err("%s: Memory squeeze, dropping packet.\n", + dev->name); + dev->stats.rx_dropped++; + break; + } + + skb_reserve(skb,2); + + /* '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->stats.rx_packets++; + dev->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 const 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 init_module(void) +{ + if (io == 0) + pr_notice("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 __exit +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"); |