| /* 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 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 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 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; |
| } |
| |
| 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); |
| memset(lp, 0, sizeof(*lp)); |
| 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; |
| 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); |
| |
| 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 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("%s: net_interrupt(): irq %d for unknown device.\n", |
| dev->name, 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)); |
| 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) { |
| 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"); |