| /* 3c507.c: An EtherLink16 device driver for Linux. */ |
| /* |
| Written 1993 by Donald Becker. |
| Copyright 1993 United States Government as represented by the Director, |
| National Security Agency. This software may only be used and distributed |
| according to the terms of the GNU Public License as modified by SRC, |
| incorported herein by reference. |
| |
| The author may be reached as becker@super.org or |
| C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715 |
| |
| Thanks go to jennings@Montrouge.SMR.slb.com ( Patrick Jennings) |
| and jrs@world.std.com (Rick Sladkey) for testing and bugfixes. |
| |
| 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 char *version = |
| "3c507.c:v0.03 10/27/93 Donald Becker (becker@super.org)\n"; |
| |
| #include <linux/config.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 documention. 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 <asm/system.h> |
| #include <asm/bitops.h> |
| #include <asm/io.h> |
| #include <asm/dma.h> |
| #include <errno.h> |
| #include <memory.h> |
| |
| #include "dev.h" |
| #include "eth.h" |
| #include "skbuff.h" |
| #include "arp.h" |
| |
| #ifndef HAVE_ALLOC_SKB |
| #define alloc_skb(size, priority) (struct sk_buff *) kmalloc(size,priority) |
| #define kfree_skbmem(addr, size) kfree_s(addr,size); |
| #else |
| #include <linux/malloc.h> |
| #endif |
| |
| /* 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; |
| |
| /* |
| 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 seperate 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 fileds: |
| 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 |
| |
| /* 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. */ |
| |
| /* |
| 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. |
| |
| */ |
| |
| short init_words[] = { |
| 0x0000, /* Set bus size to 16 bits. */ |
| 0x0000,0x0000, /* Set control mailbox (SCB) addr. */ |
| 0,0, /* pad to 0x000000. */ |
| 0x0001, /* Status word that's cleared when init is done. */ |
| 0x0008,0,0, /* SCB offset, (skip, skip) */ |
| |
| 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, short 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 reg_ptr); |
| 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); |
| |
| |
| /* 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) alloate space for the |
| device and return success. |
| */ |
| int |
| el16_probe(struct device *dev) |
| { |
| /* Don't probe all settable addresses, 0x[23][0-F]0, just common ones. */ |
| int *port, ports[] = {0x300, 0x320, 0x340, 0x280, 0}; |
| int base_addr = dev->base_addr; |
| ushort lrs_state = 0xff, 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. */ |
| |
| /* Send the ID sequence to the ID_PORT to enable the board. */ |
| 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); |
| |
| for (port = &ports[0]; *port; port++) { |
| short ioaddr = *port; |
| #if 0 |
| /* This is my original code. */ |
| if (inb(ioaddr) == '*' && inb(ioaddr+1) == '3' |
| && inb(ioaddr+2) == 'C' && inb(ioaddr+3) == 'O' |
| && el16_probe1(dev, *port) == 0) |
| return 0; |
| #else |
| /* This is code from jennings@Montrouge.SMR.slb.com, done so that |
| the string can be printed out. */ |
| char res[5]; |
| res[0] = inb(ioaddr); res[1] = inb(ioaddr+1); |
| res[2] = inb(ioaddr+2); res[3] = inb(ioaddr+3); |
| res[4] = 0; |
| if (res[0] == '*' && res[1] == '3' |
| && res[2] == 'C' && res[3] == 'O' |
| && el16_probe1(dev, *port) == 0) |
| return 0; |
| #endif |
| } |
| |
| return ENODEV; /* ENODEV would be more accurate. */ |
| } |
| |
| int el16_probe1(struct device *dev, short ioaddr) |
| { |
| int i, irq, irqval; |
| |
| 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 manufactor's code. */ |
| |
| irq = inb(ioaddr + IRQ_CONFIG) & 0x0f; |
| |
| irqval = request_irq(irq, &el16_interrupt); |
| 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. */ |
| snarf_region(ioaddr, 16); |
| 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); |
| } |
| if (size != 0x10000) |
| printk("%s: Warning, this version probably only works with 64K of" |
| "shared memory.\n", dev->name); |
| 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 %#x-%#x.\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); |
| 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; |
| |
| /* Fill in the fields of the device structure with ethernet-generic values. |
| This should be in a common file instead of per-driver. */ |
| for (i = 0; i < DEV_NUMBUFFS; i++) |
| dev->buffs[i] = NULL; |
| |
| dev->hard_header = eth_header; |
| dev->add_arp = eth_add_arp; |
| dev->queue_xmit = dev_queue_xmit; |
| dev->rebuild_header = eth_rebuild_header; |
| dev->type_trans = eth_type_trans; |
| |
| dev->type = ARPHRD_ETHER; |
| dev->hard_header_len = ETH_HLEN; |
| dev->mtu = 1500; /* eth_mtu */ |
| dev->addr_len = ETH_ALEN; |
| for (i = 0; i < ETH_ALEN; i++) { |
| dev->broadcast[i]=0xff; |
| } |
| |
| /* New-style flags. */ |
| dev->flags = IFF_BROADCAST; |
| dev->family = AF_INET; |
| dev->pa_addr = 0; |
| dev->pa_brdaddr = 0; |
| dev->pa_mask = 0; |
| dev->pa_alen = sizeof(unsigned long); |
| |
| 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; |
| 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; |
| } |
| |
| /* For ethernet, fill in the header. This should really be done by a |
| higher level, rather than duplicated for each ethernet adaptor. */ |
| if (!skb->arp && dev->rebuild_header(skb->data, dev)) { |
| skb->dev = dev; |
| arp_queue (skb); |
| return 0; |
| } |
| skb->arp=1; |
| |
| /* 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); |
| } |
| |
| if (skb->free) |
| 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 reg_ptr) |
| { |
| int irq = -(((struct pt_regs *)reg_ptr)->orig_eax+2); |
| 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(INET_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. */ |
| |
| 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; |
| |
| 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; /* 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); |
| |
| /* Write the words at 0xfff6 (address-aliased to 0xfffff6). */ |
| #ifdef old |
| memcpy((void*)dev->mem_start+0xfff6, init_words, 10); |
| #else |
| memcpy((void*)dev->mem_end-10, init_words, 10); |
| #endif |
| /* 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; /* 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. */ |
| int sksize; |
| struct sk_buff *skb; |
| |
| pkt_len &= 0x3fff; |
| sksize = sizeof(struct sk_buff) + pkt_len; |
| skb = alloc_skb(sksize, GFP_ATOMIC); |
| if (skb == NULL) { |
| printk("%s: Memory squeeze, dropping packet.\n", dev->name); |
| lp->stats.rx_dropped++; |
| break; |
| } |
| skb->mem_len = sksize; |
| skb->mem_addr = skb; |
| skb->len = pkt_len; |
| skb->dev = dev; |
| |
| /* 'skb->data' points to the start of sk_buff data area. */ |
| memcpy(skb->data, data_frame + 5, pkt_len); |
| |
| #ifdef HAVE_NETIF_RX |
| netif_rx(skb); |
| #else |
| skb->lock = 0; |
| if (dev_rint((unsigned char*)skb, pkt_len, IN_SKBUFF, dev) != 0) { |
| kfree_skbmem(skb, sksize); |
| lp->stats.rx_dropped++; |
| break; |
| } |
| #endif |
| 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; |
| } |
| |
| /* |
| * 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 |
| * End: |
| */ |
| |