diff options
Diffstat (limited to 'drivers/net/3c505.c')
| -rw-r--r-- | drivers/net/3c505.c | 1690 |
1 files changed, 1690 insertions, 0 deletions
diff --git a/drivers/net/3c505.c b/drivers/net/3c505.c new file mode 100644 index 00000000000..76fa8cc2408 --- /dev/null +++ b/drivers/net/3c505.c @@ -0,0 +1,1690 @@ +/* + * Linux Ethernet device driver for the 3Com Etherlink Plus (3C505) + * By Craig Southeren, Juha Laiho and Philip Blundell + * + * 3c505.c This module implements an interface to the 3Com + * Etherlink Plus (3c505) Ethernet card. Linux device + * driver interface reverse engineered from the Linux 3C509 + * device drivers. Some 3C505 information gleaned from + * the Crynwr packet driver. Still this driver would not + * be here without 3C505 technical reference provided by + * 3Com. + * + * $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $ + * + * Authors: Linux 3c505 device driver by + * Craig Southeren, <craigs@ineluki.apana.org.au> + * Final debugging by + * Andrew Tridgell, <tridge@nimbus.anu.edu.au> + * Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by + * Juha Laiho, <jlaiho@ichaos.nullnet.fi> + * Linux 3C509 driver by + * Donald Becker, <becker@super.org> + * (Now at <becker@scyld.com>) + * Crynwr packet driver by + * Krishnan Gopalan and Gregg Stefancik, + * Clemson University Engineering Computer Operations. + * Portions of the code have been adapted from the 3c505 + * driver for NCSA Telnet by Bruce Orchard and later + * modified by Warren Van Houten and krus@diku.dk. + * 3C505 technical information provided by + * Terry Murphy, of 3Com Network Adapter Division + * Linux 1.3.0 changes by + * Alan Cox <Alan.Cox@linux.org> + * More debugging, DMA support, currently maintained by + * Philip Blundell <philb@gnu.org> + * Multicard/soft configurable dma channel/rev 2 hardware support + * by Christopher Collins <ccollins@pcug.org.au> + * Ethtool support (jgarzik), 11/17/2001 + */ + +#define DRV_NAME "3c505" +#define DRV_VERSION "1.10a" + + +/* Theory of operation: + * + * The 3c505 is quite an intelligent board. All communication with it is done + * by means of Primary Command Blocks (PCBs); these are transferred using PIO + * through the command register. The card has 256k of on-board RAM, which is + * used to buffer received packets. It might seem at first that more buffers + * are better, but in fact this isn't true. From my tests, it seems that + * more than about 10 buffers are unnecessary, and there is a noticeable + * performance hit in having more active on the card. So the majority of the + * card's memory isn't, in fact, used. Sadly, the card only has one transmit + * buffer and, short of loading our own firmware into it (which is what some + * drivers resort to) there's nothing we can do about this. + * + * We keep up to 4 "receive packet" commands active on the board at a time. + * When a packet comes in, so long as there is a receive command active, the + * board will send us a "packet received" PCB and then add the data for that + * packet to the DMA queue. If a DMA transfer is not already in progress, we + * set one up to start uploading the data. We have to maintain a list of + * backlogged receive packets, because the card may decide to tell us about + * a newly-arrived packet at any time, and we may not be able to start a DMA + * transfer immediately (ie one may already be going on). We can't NAK the + * PCB, because then it would throw the packet away. + * + * Trying to send a PCB to the card at the wrong moment seems to have bad + * effects. If we send it a transmit PCB while a receive DMA is happening, + * it will just NAK the PCB and so we will have wasted our time. Worse, it + * sometimes seems to interrupt the transfer. The majority of the low-level + * code is protected by one huge semaphore -- "busy" -- which is set whenever + * it probably isn't safe to do anything to the card. The receive routine + * must gain a lock on "busy" before it can start a DMA transfer, and the + * transmit routine must gain a lock before it sends the first PCB to the card. + * The send_pcb() routine also has an internal semaphore to protect it against + * being re-entered (which would be disastrous) -- this is needed because + * several things can happen asynchronously (re-priming the receiver and + * asking the card for statistics, for example). send_pcb() will also refuse + * to talk to the card at all if a DMA upload is happening. The higher-level + * networking code will reschedule a later retry if some part of the driver + * is blocked. In practice, this doesn't seem to happen very often. + */ + +/* This driver may now work with revision 2.x hardware, since all the read + * operations on the HCR have been removed (we now keep our own softcopy). + * But I don't have an old card to test it on. + * + * This has had the bad effect that the autoprobe routine is now a bit + * less friendly to other devices. However, it was never very good. + * before, so I doubt it will hurt anybody. + */ + +/* The driver is a mess. I took Craig's and Juha's code, and hacked it firstly + * to make it more reliable, and secondly to add DMA mode. Many things could + * probably be done better; the concurrency protection is particularly awful. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <linux/in.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/spinlock.h> +#include <linux/ethtool.h> +#include <linux/delay.h> +#include <linux/bitops.h> + +#include <asm/uaccess.h> +#include <asm/io.h> +#include <asm/dma.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/init.h> + +#include "3c505.h" + +/********************************************************* + * + * define debug messages here as common strings to reduce space + * + *********************************************************/ + +static const char filename[] = __FILE__; + +static const char timeout_msg[] = "*** timeout at %s:%s (line %d) ***\n"; +#define TIMEOUT_MSG(lineno) \ + printk(timeout_msg, filename,__FUNCTION__,(lineno)) + +static const char invalid_pcb_msg[] = +"*** invalid pcb length %d at %s:%s (line %d) ***\n"; +#define INVALID_PCB_MSG(len) \ + printk(invalid_pcb_msg, (len),filename,__FUNCTION__,__LINE__) + +static char search_msg[] __initdata = KERN_INFO "%s: Looking for 3c505 adapter at address %#x..."; + +static char stilllooking_msg[] __initdata = "still looking..."; + +static char found_msg[] __initdata = "found.\n"; + +static char notfound_msg[] __initdata = "not found (reason = %d)\n"; + +static char couldnot_msg[] __initdata = KERN_INFO "%s: 3c505 not found\n"; + +/********************************************************* + * + * various other debug stuff + * + *********************************************************/ + +#ifdef ELP_DEBUG +static int elp_debug = ELP_DEBUG; +#else +static int elp_debug; +#endif +#define debug elp_debug + +/* + * 0 = no messages (well, some) + * 1 = messages when high level commands performed + * 2 = messages when low level commands performed + * 3 = messages when interrupts received + */ + +/***************************************************************** + * + * useful macros + * + *****************************************************************/ + +#ifndef TRUE +#define TRUE 1 +#endif + +#ifndef FALSE +#define FALSE 0 +#endif + + +/***************************************************************** + * + * List of I/O-addresses we try to auto-sense + * Last element MUST BE 0! + *****************************************************************/ + +static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0}; + +/* Dma Memory related stuff */ + +static unsigned long dma_mem_alloc(int size) +{ + int order = get_order(size); + return __get_dma_pages(GFP_KERNEL, order); +} + + +/***************************************************************** + * + * Functions for I/O (note the inline !) + * + *****************************************************************/ + +static inline unsigned char inb_status(unsigned int base_addr) +{ + return inb(base_addr + PORT_STATUS); +} + +static inline int inb_command(unsigned int base_addr) +{ + return inb(base_addr + PORT_COMMAND); +} + +static inline void outb_control(unsigned char val, struct net_device *dev) +{ + outb(val, dev->base_addr + PORT_CONTROL); + ((elp_device *)(dev->priv))->hcr_val = val; +} + +#define HCR_VAL(x) (((elp_device *)((x)->priv))->hcr_val) + +static inline void outb_command(unsigned char val, unsigned int base_addr) +{ + outb(val, base_addr + PORT_COMMAND); +} + +static inline unsigned int backlog_next(unsigned int n) +{ + return (n + 1) % BACKLOG_SIZE; +} + +/***************************************************************** + * + * useful functions for accessing the adapter + * + *****************************************************************/ + +/* + * use this routine when accessing the ASF bits as they are + * changed asynchronously by the adapter + */ + +/* get adapter PCB status */ +#define GET_ASF(addr) \ + (get_status(addr)&ASF_PCB_MASK) + +static inline int get_status(unsigned int base_addr) +{ + unsigned long timeout = jiffies + 10*HZ/100; + register int stat1; + do { + stat1 = inb_status(base_addr); + } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout)); + if (time_after_eq(jiffies, timeout)) + TIMEOUT_MSG(__LINE__); + return stat1; +} + +static inline void set_hsf(struct net_device *dev, int hsf) +{ + elp_device *adapter = dev->priv; + unsigned long flags; + + spin_lock_irqsave(&adapter->lock, flags); + outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev); + spin_unlock_irqrestore(&adapter->lock, flags); +} + +static int start_receive(struct net_device *, pcb_struct *); + +inline static void adapter_reset(struct net_device *dev) +{ + unsigned long timeout; + elp_device *adapter = dev->priv; + unsigned char orig_hcr = adapter->hcr_val; + + outb_control(0, dev); + + if (inb_status(dev->base_addr) & ACRF) { + do { + inb_command(dev->base_addr); + timeout = jiffies + 2*HZ/100; + while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF)); + } while (inb_status(dev->base_addr) & ACRF); + set_hsf(dev, HSF_PCB_NAK); + } + outb_control(adapter->hcr_val | ATTN | DIR, dev); + mdelay(10); + outb_control(adapter->hcr_val & ~ATTN, dev); + mdelay(10); + outb_control(adapter->hcr_val | FLSH, dev); + mdelay(10); + outb_control(adapter->hcr_val & ~FLSH, dev); + mdelay(10); + + outb_control(orig_hcr, dev); + if (!start_receive(dev, &adapter->tx_pcb)) + printk(KERN_ERR "%s: start receive command failed \n", dev->name); +} + +/* Check to make sure that a DMA transfer hasn't timed out. This should + * never happen in theory, but seems to occur occasionally if the card gets + * prodded at the wrong time. + */ +static inline void check_3c505_dma(struct net_device *dev) +{ + elp_device *adapter = dev->priv; + if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) { + unsigned long flags, f; + printk(KERN_ERR "%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma)); + spin_lock_irqsave(&adapter->lock, flags); + adapter->dmaing = 0; + adapter->busy = 0; + + f=claim_dma_lock(); + disable_dma(dev->dma); + release_dma_lock(f); + + if (adapter->rx_active) + adapter->rx_active--; + outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev); + spin_unlock_irqrestore(&adapter->lock, flags); + } +} + +/* Primitive functions used by send_pcb() */ +static inline unsigned int send_pcb_slow(unsigned int base_addr, unsigned char byte) +{ + unsigned long timeout; + outb_command(byte, base_addr); + for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) { + if (inb_status(base_addr) & HCRE) + return FALSE; + } + printk(KERN_WARNING "3c505: send_pcb_slow timed out\n"); + return TRUE; +} + +static inline unsigned int send_pcb_fast(unsigned int base_addr, unsigned char byte) +{ + unsigned int timeout; + outb_command(byte, base_addr); + for (timeout = 0; timeout < 40000; timeout++) { + if (inb_status(base_addr) & HCRE) + return FALSE; + } + printk(KERN_WARNING "3c505: send_pcb_fast timed out\n"); + return TRUE; +} + +/* Check to see if the receiver needs restarting, and kick it if so */ +static inline void prime_rx(struct net_device *dev) +{ + elp_device *adapter = dev->priv; + while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) { + if (!start_receive(dev, &adapter->itx_pcb)) + break; + } +} + +/***************************************************************** + * + * send_pcb + * Send a PCB to the adapter. + * + * output byte to command reg --<--+ + * wait until HCRE is non zero | + * loop until all bytes sent -->--+ + * set HSF1 and HSF2 to 1 + * output pcb length + * wait until ASF give ACK or NAK + * set HSF1 and HSF2 to 0 + * + *****************************************************************/ + +/* This can be quite slow -- the adapter is allowed to take up to 40ms + * to respond to the initial interrupt. + * + * We run initially with interrupts turned on, but with a semaphore set + * so that nobody tries to re-enter this code. Once the first byte has + * gone through, we turn interrupts off and then send the others (the + * timeout is reduced to 500us). + */ + +static int send_pcb(struct net_device *dev, pcb_struct * pcb) +{ + int i; + unsigned long timeout; + elp_device *adapter = dev->priv; + unsigned long flags; + + check_3c505_dma(dev); + + if (adapter->dmaing && adapter->current_dma.direction == 0) + return FALSE; + + /* Avoid contention */ + if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) { + if (elp_debug >= 3) { + printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name); + } + return FALSE; + } + /* + * load each byte into the command register and + * wait for the HCRE bit to indicate the adapter + * had read the byte + */ + set_hsf(dev, 0); + + if (send_pcb_slow(dev->base_addr, pcb->command)) + goto abort; + + spin_lock_irqsave(&adapter->lock, flags); + + if (send_pcb_fast(dev->base_addr, pcb->length)) + goto sti_abort; + + for (i = 0; i < pcb->length; i++) { + if (send_pcb_fast(dev->base_addr, pcb->data.raw[i])) + goto sti_abort; + } + + outb_control(adapter->hcr_val | 3, dev); /* signal end of PCB */ + outb_command(2 + pcb->length, dev->base_addr); + + /* now wait for the acknowledgement */ + spin_unlock_irqrestore(&adapter->lock, flags); + + for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) { + switch (GET_ASF(dev->base_addr)) { + case ASF_PCB_ACK: + adapter->send_pcb_semaphore = 0; + return TRUE; + + case ASF_PCB_NAK: +#ifdef ELP_DEBUG + printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name); +#endif + goto abort; + } + } + + if (elp_debug >= 1) + printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr)); + goto abort; + + sti_abort: + spin_unlock_irqrestore(&adapter->lock, flags); + abort: + adapter->send_pcb_semaphore = 0; + return FALSE; +} + + +/***************************************************************** + * + * receive_pcb + * Read a PCB from the adapter + * + * wait for ACRF to be non-zero ---<---+ + * input a byte | + * if ASF1 and ASF2 were not both one | + * before byte was read, loop --->---+ + * set HSF1 and HSF2 for ack + * + *****************************************************************/ + +static int receive_pcb(struct net_device *dev, pcb_struct * pcb) +{ + int i, j; + int total_length; + int stat; + unsigned long timeout; + unsigned long flags; + + elp_device *adapter = dev->priv; + + set_hsf(dev, 0); + + /* get the command code */ + timeout = jiffies + 2*HZ/100; + while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout)); + if (time_after_eq(jiffies, timeout)) { + TIMEOUT_MSG(__LINE__); + return FALSE; + } + pcb->command = inb_command(dev->base_addr); + + /* read the data length */ + timeout = jiffies + 3*HZ/100; + while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout)); + if (time_after_eq(jiffies, timeout)) { + TIMEOUT_MSG(__LINE__); + printk(KERN_INFO "%s: status %02x\n", dev->name, stat); + return FALSE; + } + pcb->length = inb_command(dev->base_addr); + + if (pcb->length > MAX_PCB_DATA) { + INVALID_PCB_MSG(pcb->length); + adapter_reset(dev); + return FALSE; + } + /* read the data */ + spin_lock_irqsave(&adapter->lock, flags); + i = 0; + do { + j = 0; + while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000); + pcb->data.raw[i++] = inb_command(dev->base_addr); + if (i > MAX_PCB_DATA) + INVALID_PCB_MSG(i); + } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000); + spin_unlock_irqrestore(&adapter->lock, flags); + if (j >= 20000) { + TIMEOUT_MSG(__LINE__); + return FALSE; + } + /* woops, the last "data" byte was really the length! */ + total_length = pcb->data.raw[--i]; + + /* safety check total length vs data length */ + if (total_length != (pcb->length + 2)) { + if (elp_debug >= 2) + printk(KERN_WARNING "%s: mangled PCB received\n", dev->name); + set_hsf(dev, HSF_PCB_NAK); + return FALSE; + } + + if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) { + if (test_and_set_bit(0, (void *) &adapter->busy)) { + if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) { + set_hsf(dev, HSF_PCB_NAK); + printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name); + pcb->command = 0; + return TRUE; + } else { + pcb->command = 0xff; + } + } + } + set_hsf(dev, HSF_PCB_ACK); + return TRUE; +} + +/****************************************************** + * + * queue a receive command on the adapter so we will get an + * interrupt when a packet is received. + * + ******************************************************/ + +static int start_receive(struct net_device *dev, pcb_struct * tx_pcb) +{ + int status; + elp_device *adapter = dev->priv; + + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: restarting receiver\n", dev->name); + tx_pcb->command = CMD_RECEIVE_PACKET; + tx_pcb->length = sizeof(struct Rcv_pkt); + tx_pcb->data.rcv_pkt.buf_seg + = tx_pcb->data.rcv_pkt.buf_ofs = 0; /* Unused */ + tx_pcb->data.rcv_pkt.buf_len = 1600; + tx_pcb->data.rcv_pkt.timeout = 0; /* set timeout to zero */ + status = send_pcb(dev, tx_pcb); + if (status) + adapter->rx_active++; + return status; +} + +/****************************************************** + * + * extract a packet from the adapter + * this routine is only called from within the interrupt + * service routine, so no cli/sti calls are needed + * note that the length is always assumed to be even + * + ******************************************************/ + +static void receive_packet(struct net_device *dev, int len) +{ + int rlen; + elp_device *adapter = dev->priv; + void *target; + struct sk_buff *skb; + unsigned long flags; + + rlen = (len + 1) & ~1; + skb = dev_alloc_skb(rlen + 2); + + if (!skb) { + printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name); + target = adapter->dma_buffer; + adapter->current_dma.target = NULL; + /* FIXME: stats */ + return; + } + + skb_reserve(skb, 2); + target = skb_put(skb, rlen); + if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) { + adapter->current_dma.target = target; + target = adapter->dma_buffer; + } else { + adapter->current_dma.target = NULL; + } + + /* if this happens, we die */ + if (test_and_set_bit(0, (void *) &adapter->dmaing)) + printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction); + + skb->dev = dev; + adapter->current_dma.direction = 0; + adapter->current_dma.length = rlen; + adapter->current_dma.skb = skb; + adapter->current_dma.start_time = jiffies; + + outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev); + + flags=claim_dma_lock(); + disable_dma(dev->dma); + clear_dma_ff(dev->dma); + set_dma_mode(dev->dma, 0x04); /* dma read */ + set_dma_addr(dev->dma, isa_virt_to_bus(target)); + set_dma_count(dev->dma, rlen); + enable_dma(dev->dma); + release_dma_lock(flags); + + if (elp_debug >= 3) { + printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name); + } + + if (adapter->rx_active) + adapter->rx_active--; + + if (!adapter->busy) + printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name); +} + +/****************************************************** + * + * interrupt handler + * + ******************************************************/ + +static irqreturn_t elp_interrupt(int irq, void *dev_id, struct pt_regs *reg_ptr) +{ + int len; + int dlen; + int icount = 0; + struct net_device *dev; + elp_device *adapter; + unsigned long timeout; + + dev = dev_id; + adapter = (elp_device *) dev->priv; + + spin_lock(&adapter->lock); + + do { + /* + * has a DMA transfer finished? + */ + if (inb_status(dev->base_addr) & DONE) { + if (!adapter->dmaing) { + printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name); + } + if (elp_debug >= 3) { + printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr)); + } + + outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev); + if (adapter->current_dma.direction) { + dev_kfree_skb_irq(adapter->current_dma.skb); + } else { + struct sk_buff *skb = adapter->current_dma.skb; + if (skb) { + if (adapter->current_dma.target) { + /* have already done the skb_put() */ + memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length); + } + skb->protocol = eth_type_trans(skb,dev); + adapter->stats.rx_bytes += skb->len; + netif_rx(skb); + dev->last_rx = jiffies; + } + } + adapter->dmaing = 0; + if (adapter->rx_backlog.in != adapter->rx_backlog.out) { + int t = adapter->rx_backlog.length[adapter->rx_backlog.out]; + adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out); + if (elp_debug >= 2) + printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t); + receive_packet(dev, t); + } else { + adapter->busy = 0; + } + } else { + /* has one timed out? */ + check_3c505_dma(dev); + } + + /* + * receive a PCB from the adapter + */ + timeout = jiffies + 3*HZ/100; + while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) { + if (receive_pcb(dev, &adapter->irx_pcb)) { + switch (adapter->irx_pcb.command) + { + case 0: + break; + /* + * received a packet - this must be handled fast + */ + case 0xff: + case CMD_RECEIVE_PACKET_COMPLETE: + /* if the device isn't open, don't pass packets up the stack */ + if (!netif_running(dev)) + break; + len = adapter->irx_pcb.data.rcv_resp.pkt_len; + dlen = adapter->irx_pcb.data.rcv_resp.buf_len; + if (adapter->irx_pcb.data.rcv_resp.timeout != 0) { + printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name); + } else { + if (elp_debug >= 3) { + printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen); + } + if (adapter->irx_pcb.command == 0xff) { + if (elp_debug >= 2) + printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen); + adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen; + adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in); + } else { + receive_packet(dev, dlen); + } + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: packet received\n", dev->name); + } + break; + + /* + * 82586 configured correctly + */ + case CMD_CONFIGURE_82586_RESPONSE: + adapter->got[CMD_CONFIGURE_82586] = 1; + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name); + break; + + /* + * Adapter memory configuration + */ + case CMD_CONFIGURE_ADAPTER_RESPONSE: + adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1; + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name, + adapter->irx_pcb.data.failed ? "failed" : "succeeded"); + break; + + /* + * Multicast list loading + */ + case CMD_LOAD_MULTICAST_RESPONSE: + adapter->got[CMD_LOAD_MULTICAST_LIST] = 1; + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name, + adapter->irx_pcb.data.failed ? "failed" : "succeeded"); + break; + + /* + * Station address setting + */ + case CMD_SET_ADDRESS_RESPONSE: + adapter->got[CMD_SET_STATION_ADDRESS] = 1; + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name, + adapter->irx_pcb.data.failed ? "failed" : "succeeded"); + break; + + + /* + * received board statistics + */ + case CMD_NETWORK_STATISTICS_RESPONSE: + adapter->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv; + adapter->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit; + adapter->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC; + adapter->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align; + adapter->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun; + adapter->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res; + adapter->got[CMD_NETWORK_STATISTICS] = 1; + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name); + break; + + /* + * sent a packet + */ + case CMD_TRANSMIT_PACKET_COMPLETE: + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name); + if (!netif_running(dev)) + break; + switch (adapter->irx_pcb.data.xmit_resp.c_stat) { + case 0xffff: + adapter->stats.tx_aborted_errors++; + printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name); + break; + case 0xfffe: + adapter->stats.tx_fifo_errors++; + printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name); + break; + } + netif_wake_queue(dev); + break; + + /* + * some unknown PCB + */ + default: + printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command); + break; + } + } else { + printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name); + adapter_reset(dev); + } + } + + } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE))); + + prime_rx(dev); + + /* + * indicate no longer in interrupt routine + */ + spin_unlock(&adapter->lock); + return IRQ_HANDLED; +} + + +/****************************************************** + * + * open the board + * + ******************************************************/ + +static int elp_open(struct net_device *dev) +{ + elp_device *adapter; + int retval; + + adapter = dev->priv; + + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: request to open device\n", dev->name); + + /* + * make sure we actually found the device + */ + if (adapter == NULL) { + printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name); + return -EAGAIN; + } + /* + * disable interrupts on the board + */ + outb_control(0, dev); + + /* + * clear any pending interrupts + */ + inb_command(dev->base_addr); + adapter_reset(dev); + + /* + * no receive PCBs active + */ + adapter->rx_active = 0; + + adapter->busy = 0; + adapter->send_pcb_semaphore = 0; + adapter->rx_backlog.in = 0; + adapter->rx_backlog.out = 0; + + spin_lock_init(&adapter->lock); + + /* + * install our interrupt service routine + */ + if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) { + printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq); + return retval; + } + if ((retval = request_dma(dev->dma, dev->name))) { + free_irq(dev->irq, dev); + printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma); + return retval; + } + adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE); + if (!adapter->dma_buffer) { + printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name); + free_dma(dev->dma); + free_irq(dev->irq, dev); + return -ENOMEM; + } + adapter->dmaing = 0; + + /* + * enable interrupts on the board + */ + outb_control(CMDE, dev); + + /* + * configure adapter memory: we need 10 multicast addresses, default==0 + */ + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name); + adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY; + adapter->tx_pcb.data.memconf.cmd_q = 10; + adapter->tx_pcb.data.memconf.rcv_q = 20; + adapter->tx_pcb.data.memconf.mcast = 10; + adapter->tx_pcb.data.memconf.frame = 20; + adapter->tx_pcb.data.memconf.rcv_b = 20; + adapter->tx_pcb.data.memconf.progs = 0; + adapter->tx_pcb.length = sizeof(struct Memconf); + adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0; + if (!send_pcb(dev, &adapter->tx_pcb)) + printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name); + else { + unsigned long timeout = jiffies + TIMEOUT; + while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout)); + if (time_after_eq(jiffies, timeout)) + TIMEOUT_MSG(__LINE__); + } + + + /* + * configure adapter to receive broadcast messages and wait for response + */ + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name); + adapter->tx_pcb.command = CMD_CONFIGURE_82586; + adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD; + adapter->tx_pcb.length = 2; + adapter->got[CMD_CONFIGURE_82586] = 0; + if (!send_pcb(dev, &adapter->tx_pcb)) + printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name); + else { + unsigned long timeout = jiffies + TIMEOUT; + while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout)); + if (time_after_eq(jiffies, timeout)) + TIMEOUT_MSG(__LINE__); + } + + /* enable burst-mode DMA */ + /* outb(0x1, dev->base_addr + PORT_AUXDMA); */ + + /* + * queue receive commands to provide buffering + */ + prime_rx(dev); + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active); + + /* + * device is now officially open! + */ + + netif_start_queue(dev); + return 0; +} + + +/****************************************************** + * + * send a packet to the adapter + * + ******************************************************/ + +static int send_packet(struct net_device *dev, struct sk_buff *skb) +{ + elp_device *adapter = dev->priv; + unsigned long target; + unsigned long flags; + + /* + * make sure the length is even and no shorter than 60 bytes + */ + unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1); + + if (test_and_set_bit(0, (void *) &adapter->busy)) { + if (elp_debug >= 2) + printk(KERN_DEBUG "%s: transmit blocked\n", dev->name); + return FALSE; + } + + adapter->stats.tx_bytes += nlen; + + /* + * send the adapter a transmit packet command. Ignore segment and offset + * and make sure the length is even + */ + adapter->tx_pcb.command = CMD_TRANSMIT_PACKET; + adapter->tx_pcb.length = sizeof(struct Xmit_pkt); + adapter->tx_pcb.data.xmit_pkt.buf_ofs + = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0; /* Unused */ + adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen; + + if (!send_pcb(dev, &adapter->tx_pcb)) { + adapter->busy = 0; + return FALSE; + } + /* if this happens, we die */ + if (test_and_set_bit(0, (void *) &adapter->dmaing)) + printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction); + + adapter->current_dma.direction = 1; + adapter->current_dma.start_time = jiffies; + + if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) { + memcpy(adapter->dma_buffer, skb->data, nlen); + memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len); + target = isa_virt_to_bus(adapter->dma_buffer); + } + else { + target = isa_virt_to_bus(skb->data); + } + adapter->current_dma.skb = skb; + + flags=claim_dma_lock(); + disable_dma(dev->dma); + clear_dma_ff(dev->dma); + set_dma_mode(dev->dma, 0x48); /* dma memory -> io */ + set_dma_addr(dev->dma, target); + set_dma_count(dev->dma, nlen); + outb_control(adapter->hcr_val | DMAE | TCEN, dev); + enable_dma(dev->dma); + release_dma_lock(flags); + + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name); + + return TRUE; +} + +/* + * The upper layer thinks we timed out + */ + +static void elp_timeout(struct net_device *dev) +{ + elp_device *adapter = dev->priv; + int stat; + + stat = inb_status(dev->base_addr); + printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command"); + if (elp_debug >= 1) + printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat); + dev->trans_start = jiffies; + adapter->stats.tx_dropped++; + netif_wake_queue(dev); +} + +/****************************************************** + * + * start the transmitter + * return 0 if sent OK, else return 1 + * + ******************************************************/ + +static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + unsigned long flags; + elp_device *adapter = dev->priv; + + spin_lock_irqsave(&adapter->lock, flags); + check_3c505_dma(dev); + + if (elp_debug >= 3) + printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len); + + netif_stop_queue(dev); + + /* + * send the packet at skb->data for skb->len + */ + if (!send_packet(dev, skb)) { + if (elp_debug >= 2) { + printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name); + } + spin_unlock_irqrestore(&adapter->lock, flags); + return 1; |