static char *version = "de600.c: $Revision: 1.40 $, Bjorn Ekwall (bj0rn@blox.se)\n"; /* * de600.c * * Linux driver for the D-Link DE-600 Ethernet pocket adapter. * * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall * The Author may be reached as bj0rn@blox.se * * Based on adapter information gathered from DE600.ASM by D-Link Inc., * as included on disk C in the v.2.11 of PC/TCP from FTP Software. * For DE600.asm: * Portions (C) Copyright 1990 D-Link, Inc. * Copyright, 1988-1992, Russell Nelson, Crynwr Software * * Adapted to the sample network driver core for linux, * written by: Donald Becker * C/O Supercomputing Research Ctr., 17100 Science Dr., Bowie MD 20715 * * compile-command: * "gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer \ * -m486 -c de600.c * **************************************************************/ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * **************************************************************/ /* Add another "; SLOW_DOWN_IO" here if your adapter won't work OK: */ #define DE600_SLOW_DOWN SLOW_DOWN_IO; SLOW_DOWN_IO; SLOW_DOWN_IO /* * If you still have trouble reading/writing to the adapter, * modify the following "#define": (see for more info) #define REALLY_SLOW_IO */ #define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */ /* * If you want to enable automatic continuous checking for the DE600, * keep this #define enabled. * It doesn't cost much per packet, so I think it is worth it! * If you disagree, comment away the #define, and live with it... * */ #define CHECK_LOST_DE600 /* * Enable this #define if you want the adapter to do a "ifconfig down" on * itself when we have detected that something is possibly wrong with it. * The default behaviour is to retry with "adapter_init()" until success. * This should be used for debugging purposes only. * (Depends on the CHECK_LOST_DE600 above) * */ #define SHUTDOWN_WHEN_LOST /* * See comment at "de600_rspace()"! * This is an *ugly* hack, but for now it achieves its goal of * faking a TCP flow-control that will not flood the poor DE600. * * Tricks TCP to announce a small max window (max 2 fast packets please :-) * * Comment away at your own risk! * * Update: Use the more general per-device maxwindow parameter instead. */ #undef FAKE_SMALL_MAX /* use 0 for production, 1 for verification, >2 for debug */ #ifdef DE600_DEBUG #define PRINTK(x) if (de600_debug >= 2) printk x #else #define DE600_DEBUG 0 #define PRINTK(x) /**/ #endif unsigned int de600_debug = DE600_DEBUG; #ifdef MODULE #include #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef FAKE_SMALL_MAX static unsigned long de600_rspace(struct sock *sk); #include "../../net/inet/sock.h" #endif #define netstats enet_statistics typedef unsigned char byte; /************************************************** * * * Definition of D-Link Ethernet Pocket adapter * * * **************************************************/ /* * D-Link Ethernet pocket adapter ports */ /* * OK, so I'm cheating, but there are an awful lot of * reads and writes in order to get anything in and out * of the DE-600 with 4 bits at a time in the parallel port, * so every saved instruction really helps :-) * * That is, I don't care what the device struct says * but hope that Space.c will keep the rest of the drivers happy. */ #ifndef DE600_IO #define DE600_IO 0x378 #endif #define DATA_PORT (DE600_IO) #define STATUS_PORT (DE600_IO + 1) #define COMMAND_PORT (DE600_IO + 2) #ifndef DE600_IRQ #define DE600_IRQ 7 #endif /* * It really should look like this, and autoprobing as well... * #define DATA_PORT (dev->base_addr + 0) #define STATUS_PORT (dev->base_addr + 1) #define COMMAND_PORT (dev->base_addr + 2) #define DE600_IRQ dev->irq */ /* * D-Link COMMAND_PORT commands */ #define SELECT_NIC 0x04 /* select Network Interface Card */ #define SELECT_PRN 0x1c /* select Printer */ #define NML_PRN 0xec /* normal Printer situation */ #define IRQEN 0x10 /* enable IRQ line */ /* * D-Link STATUS_PORT */ #define RX_BUSY 0x80 #define RX_GOOD 0x40 #define TX_FAILED16 0x10 #define TX_BUSY 0x08 /* * D-Link DATA_PORT commands * command in low 4 bits * data in high 4 bits * select current data nibble with HI_NIBBLE bit */ #define WRITE_DATA 0x00 /* write memory */ #define READ_DATA 0x01 /* read memory */ #define STATUS 0x02 /* read status register */ #define COMMAND 0x03 /* write command register (see COMMAND below) */ #define NULL_COMMAND 0x04 /* null command */ #define RX_LEN 0x05 /* read received packet length */ #define TX_ADDR 0x06 /* set adapter transmit memory address */ #define RW_ADDR 0x07 /* set adapter read/write memory address */ #define HI_NIBBLE 0x08 /* read/write the high nibble of data, or-ed with rest of command */ /* * command register, accessed through DATA_PORT with low bits = COMMAND */ #define RX_ALL 0x01 /* PROMISCUOUS */ #define RX_BP 0x02 /* default: BROADCAST & PHYSICAL ADDRESS */ #define RX_MBP 0x03 /* MULTICAST, BROADCAST & PHYSICAL ADDRESS */ #define TX_ENABLE 0x04 /* bit 2 */ #define RX_ENABLE 0x08 /* bit 3 */ #define RESET 0x80 /* set bit 7 high */ #define STOP_RESET 0x00 /* set bit 7 low */ /* * data to command register * (high 4 bits in write to DATA_PORT) */ #define RX_PAGE2_SELECT 0x10 /* bit 4, only 2 pages to select */ #define RX_BASE_PAGE 0x20 /* bit 5, always set when specifying RX_ADDR */ #define FLIP_IRQ 0x40 /* bit 6 */ /* * D-Link adapter internal memory: * * 0-2K 1:st transmit page (send from pointer up to 2K) * 2-4K 2:nd transmit page (send from pointer up to 4K) * * 4-6K 1:st receive page (data from 4K upwards) * 6-8K 2:nd receive page (data from 6K upwards) * * 8K+ Adapter ROM (contains magic code and last 3 bytes of Ethernet address) */ #define MEM_2K 0x0800 /* 2048 */ #define MEM_4K 0x1000 /* 4096 */ #define MEM_6K 0x1800 /* 6144 */ #define NODE_ADDRESS 0x2000 /* 8192 */ #define RUNT 60 /* Too small Ethernet packet */ /************************************************** * * * End of definition * * * **************************************************/ /* * Index to functions, as function prototypes. */ /* Routines used internally. (See "convenience macros") */ static byte de600_read_status(struct device *dev); static byte de600_read_byte(unsigned char type, struct device *dev); /* Put in the device structure. */ static int de600_open(struct device *dev); static int de600_close(struct device *dev); static struct netstats *get_stats(struct device *dev); static int de600_start_xmit(struct sk_buff *skb, struct device *dev); /* Dispatch from interrupts. */ static void de600_interrupt(int irq, struct pt_regs *regs); static int de600_tx_intr(struct device *dev, int irq_status); static void de600_rx_intr(struct device *dev); /* Initialization */ static void trigger_interrupt(struct device *dev); int de600_probe(struct device *dev); static int adapter_init(struct device *dev); /* * D-Link driver variables: */ static volatile int rx_page = 0; #define TX_PAGES 2 static volatile int tx_fifo[TX_PAGES]; static volatile int tx_fifo_in = 0; static volatile int tx_fifo_out = 0; static volatile int free_tx_pages = TX_PAGES; static int was_down = 0; /* * Convenience macros/functions for D-Link adapter */ #define select_prn() outb_p(SELECT_PRN, COMMAND_PORT); DE600_SLOW_DOWN #define select_nic() outb_p(SELECT_NIC, COMMAND_PORT); DE600_SLOW_DOWN /* Thanks for hints from Mark Burton */ #define de600_put_byte(data) ( \ outb_p(((data) << 4) | WRITE_DATA , DATA_PORT), \ outb_p(((data) & 0xf0) | WRITE_DATA | HI_NIBBLE, DATA_PORT)) /* * The first two outb_p()'s below could perhaps be deleted if there * would be more delay in the last two. Not certain about it yet... */ #define de600_put_command(cmd) ( \ outb_p(( rx_page << 4) | COMMAND , DATA_PORT), \ outb_p(( rx_page & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT), \ outb_p(((rx_page | cmd) << 4) | COMMAND , DATA_PORT), \ outb_p(((rx_page | cmd) & 0xf0) | COMMAND | HI_NIBBLE, DATA_PORT)) #define de600_setup_address(addr,type) ( \ outb_p((((addr) << 4) & 0xf0) | type , DATA_PORT), \ outb_p(( (addr) & 0xf0) | type | HI_NIBBLE, DATA_PORT), \ outb_p((((addr) >> 4) & 0xf0) | type , DATA_PORT), \ outb_p((((addr) >> 8) & 0xf0) | type | HI_NIBBLE, DATA_PORT)) #define rx_page_adr() ((rx_page & RX_PAGE2_SELECT)?(MEM_6K):(MEM_4K)) /* Flip bit, only 2 pages */ #define next_rx_page() (rx_page ^= RX_PAGE2_SELECT) #define tx_page_adr(a) (((a) + 1) * MEM_2K) static inline byte de600_read_status(struct device *dev) { byte status; outb_p(STATUS, DATA_PORT); status = inb(STATUS_PORT); outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT); return status; } static inline byte de600_read_byte(unsigned char type, struct device *dev) { /* dev used by macros */ byte lo; (void)outb_p((type), DATA_PORT); lo = ((unsigned char)inb(STATUS_PORT)) >> 4; (void)outb_p((type) | HI_NIBBLE, DATA_PORT); return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo; } /* * Open/initialize the board. This is called (in the current kernel) * after booting when 'ifconfig name> $IP_ADDR' is run (in rc.inet1). * * This routine should set everything up anew at each open, even * registers that "should" only need to be set once at boot, so that * there is a non-reboot way to recover if something goes wrong. */ static int de600_open(struct device *dev) { if (request_irq(DE600_IRQ, de600_interrupt, 0, "de600")) { printk ("%s: unable to get IRQ %d\n", dev->name, DE600_IRQ); return 1; } irq2dev_map[DE600_IRQ] = dev; #ifdef MODULE MOD_INC_USE_COUNT; #endif dev->start = 1; if (adapter_init(dev)) { return 1; } return 0; } /* * The inverse routine to de600_open(). */ static int de600_close(struct device *dev) { select_nic(); rx_page = 0; de600_put_command(RESET); de600_put_command(STOP_RESET); de600_put_command(0); select_prn(); if (dev->start) { free_irq(DE600_IRQ); irq2dev_map[DE600_IRQ] = NULL; dev->start = 0; #ifdef MODULE MOD_DEC_USE_COUNT; #endif } return 0; } static struct netstats * get_stats(struct device *dev) { return (struct netstats *)(dev->priv); } static inline void trigger_interrupt(struct device *dev) { de600_put_command(FLIP_IRQ); select_prn(); DE600_SLOW_DOWN; select_nic(); de600_put_command(0); } /* * Copy a buffer to the adapter transmit page memory. * Start sending. */ static int de600_start_xmit(struct sk_buff *skb, struct device *dev) { int transmit_from; int len; int tickssofar; byte *buffer = skb->data; /* * If some higher layer thinks we've missed a * tx-done interrupt we are passed NULL. * Caution: dev_tint() handles the cli()/sti() itself. */ if (skb == NULL) { dev_tint(dev); return 0; } if (free_tx_pages <= 0) { /* Do timeouts, to avoid hangs. */ tickssofar = jiffies - dev->trans_start; if (tickssofar < 5) return 1; /* else */ printk("%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem" ); /* Restart the adapter. */ if (adapter_init(dev)) { return 1; } } /* Start real output */ PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages)); if ((len = skb->len) < RUNT) len = RUNT; cli(); select_nic(); tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len; tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */ #ifdef CHECK_LOST_DE600 /* This costs about 40 instructions per packet... */ de600_setup_address(NODE_ADDRESS, RW_ADDR); de600_read_byte(READ_DATA, dev); if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) { if (adapter_init(dev)) { sti(); return 1; } } #endif de600_setup_address(transmit_from, RW_ADDR); for ( ; len > 0; --len, ++buffer) de600_put_byte(*buffer); if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */ dev->trans_start = jiffies; dev->tbusy = 0; /* allow more packets into adapter */ /* Send page and generate a faked interrupt */ de600_setup_address(transmit_from, TX_ADDR); de600_put_command(TX_ENABLE); } else { dev->tbusy = !free_tx_pages; select_prn(); } sti(); /* interrupts back on */ #ifdef FAKE_SMALL_MAX /* This will "patch" the socket TCP proto at an early moment */ if (skb->sk && (skb->sk->protocol == IPPROTO_TCP) && (skb->sk->prot->rspace != &de600_rspace)) skb->sk->prot->rspace = de600_rspace; /* Ugh! */ #endif dev_kfree_skb (skb, FREE_WRITE); return 0; } /* * The typical workload of the driver: * Handle the network interface interrupts. */ static void de600_interrupt(int irq, struct pt_regs * regs) { struct device *dev = irq2dev_map[irq]; byte irq_status; int retrig = 0; int boguscount = 0; /* This might just as well be deleted now, no crummy drivers present :-) */ if ((dev == NULL) || (dev->start == 0) || (DE600_IRQ != irq)) { printk("%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq); return; } dev->interrupt = 1; select_nic(); irq_status = de600_read_status(dev); do { PRINTK(("de600_interrupt (%02X)\n", irq_status)); if (irq_status & RX_GOOD) de600_rx_intr(dev); else if (!(irq_status & RX_BUSY)) de600_put_command(RX_ENABLE); /* Any transmission in progress? */ if (free_tx_pages < TX_PAGES) retrig = de600_tx_intr(dev, irq_status); else retrig = 0; irq_status = de600_read_status(dev); } while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) ); /* * Yeah, it _looks_ like busy waiting, smells like busy waiting * and I know it's not PC, but please, it will only occur once * in a while and then only for a loop or so (< 1ms for sure!) */ /* Enable adapter interrupts */ dev->interrupt = 0; select_prn(); if (retrig) trigger_interrupt(dev); sti(); return; } static int de600_tx_intr(struct device *dev, int irq_status) { /* * Returns 1 if tx still not done */ mark_bh(NET_BH); /* Check if current transmission is done yet */ if (irq_status & TX_BUSY) return 1; /* tx not done, try again */ /* else */ /* If last transmission OK then bump fifo index */ if (!(irq_status & TX_FAILED16)) { tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES; ++free_tx_pages; ((struct netstats *)(dev->priv))->tx_packets++; dev->tbusy = 0; } /* More to send, or resend last packet? */ if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) { dev->trans_start = jiffies; de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR); de600_put_command(TX_ENABLE); return 1; } /* else */ return 0; } /* * We have a good packet, get it out of the adapter. */ static void de600_rx_intr(struct device *dev) { struct sk_buff *skb; int i; int read_from; int size; register unsigned char *buffer; cli(); /* Get size of received packet */ size = de600_read_byte(RX_LEN, dev); /* low byte */ size += (de600_read_byte(RX_LEN, dev) << 8); /* high byte */ size -= 4; /* Ignore trailing 4 CRC-bytes */ /* Tell adapter where to store next incoming packet, enable receiver */ read_from = rx_page_adr(); next_rx_page(); de600_put_command(RX_ENABLE); sti(); if ((size < 32) || (size > 1535)) { printk("%s: Bogus packet size %d.\n", dev->name, size); if (size > 10000) adapter_init(dev); return; } skb = alloc_skb(size, GFP_ATOMIC); sti(); if (skb == NULL) { printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size); return; } /* else */ skb->lock = 0; /* 'skb->data' points to the start of sk_buff data area. */ buffer = skb->data; /* copy the packet into the buffer */ de600_setup_address(read_from, RW_ADDR); for (i = size; i > 0; --i, ++buffer) *buffer = de600_read_byte(READ_DATA, dev); ((struct netstats *)(dev->priv))->rx_packets++; /* count all receives */ if (dev_rint((unsigned char *)skb, size, IN_SKBUFF, dev)) printk("%s: receive buffers full.\n", dev->name); /* * If any worth-while packets have been received, dev_rint() * has done a mark_bh(INET_BH) for us and will work on them * when we get to the bottom-half routine. */ } int de600_probe(struct device *dev) { int i; static struct netstats de600_netstats; /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/ printk("%s: D-Link DE-600 pocket adapter", dev->name); /* Alpha testers must have the version number to report bugs. */ if (de600_debug > 1) printk(version); /* probe for adapter */ rx_page = 0; select_nic(); (void)de600_read_status(dev); de600_put_command(RESET); de600_put_command(STOP_RESET); if (de600_read_status(dev) & 0xf0) { printk(": not at I/O %#3x.\n", DATA_PORT); return ENODEV; } /* * Maybe we found one, * have to check if it is a D-Link DE-600 adapter... */ /* Get the adapter ethernet address from the ROM */ de600_setup_address(NODE_ADDRESS, RW_ADDR); for (i = 0; i < ETH_ALEN; i++) { dev->dev_addr[i] = de600_read_byte(READ_DATA, dev); dev->broadcast[i] = 0xff; } /* Check magic code */ if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) { /* OK, install real address */ dev->dev_addr[0] = 0x00; dev->dev_addr[1] = 0x80; dev->dev_addr[2] = 0xc8; dev->dev_addr[3] &= 0x0f; dev->dev_addr[3] |= 0x70; } else { printk(" not identified in the printer port\n"); return ENODEV; } #if 0 /* Not yet */ if (check_region(DE600_IO, 3)) { printk(", port 0x%x busy\n", DE600_IO); return EBUSY; } #endif request_region(DE600_IO, 3, "de600"); printk(", Ethernet Address: %02X", dev->dev_addr[0]); for (i = 1; i < ETH_ALEN; i++) printk(":%02X",dev->dev_addr[i]); printk("\n"); /* Initialize the device structure. */ /*dev->priv = kmalloc(sizeof(struct netstats), GFP_KERNEL);*/ dev->priv = &de600_netstats; memset(dev->priv, 0, sizeof(struct netstats)); dev->get_stats = get_stats; dev->open = de600_open; dev->stop = de600_close; dev->hard_start_xmit = &de600_start_xmit; ether_setup(dev); select_prn(); return 0; } static int adapter_init(struct device *dev) { int i; long flags; save_flags(flags); cli(); select_nic(); rx_page = 0; /* used by RESET */ de600_put_command(RESET); de600_put_command(STOP_RESET); #ifdef CHECK_LOST_DE600 /* Check if it is still there... */ /* Get the some bytes of the adapter ethernet address from the ROM */ de600_setup_address(NODE_ADDRESS, RW_ADDR); de600_read_byte(READ_DATA, dev); if ((de600_read_byte(READ_DATA, dev) != 0xde) || (de600_read_byte(READ_DATA, dev) != 0x15)) { /* was: if (de600_read_status(dev) & 0xf0) { */ printk("Something has happened to the DE-600! Please check it" #ifdef SHUTDOWN_WHEN_LOST " and do a new ifconfig" #endif /* SHUTDOWN_WHEN_LOST */ "!\n"); #ifdef SHUTDOWN_WHEN_LOST /* Goodbye, cruel world... */ dev->flags &= ~IFF_UP; de600_close(dev); #endif /* SHUTDOWN_WHEN_LOST */ was_down = 1; dev->tbusy = 1; /* Transmit busy... */ return 1; /* failed */ } #endif /* CHECK_LOST_DE600 */ if (was_down) { printk("Thanks, I feel much better now!\n"); was_down = 0; } dev->tbusy = 0; /* Transmit busy... */ dev->interrupt = 0; tx_fifo_in = 0; tx_fifo_out = 0; free_tx_pages = TX_PAGES; /* set the ether address. */ de600_setup_address(NODE_ADDRESS, RW_ADDR); for (i = 0; i < ETH_ALEN; i++) de600_put_byte(dev->dev_addr[i]); /* where to start saving incoming packets */ rx_page = RX_BP | RX_BASE_PAGE; de600_setup_address(MEM_4K, RW_ADDR); /* Enable receiver */ de600_put_command(RX_ENABLE); select_prn(); restore_flags(flags); return 0; /* OK */ } #ifdef FAKE_SMALL_MAX /* * The new router code (coming soon 8-) ) will fix this properly. */ #define DE600_MIN_WINDOW 1024 #define DE600_MAX_WINDOW 2048 #define DE600_TCP_WINDOW_DIFF 1024 /* * Copied from "net/inet/sock.c" * * Sets a lower max receive window in order to achieve <= 2 * packets arriving at the adapter in fast succession. * (No way that a DE-600 can keep up with a net saturated * with packets homing in on it :-( ) * * Since there are only 2 receive buffers in the DE-600 * and it takes some time to copy from the adapter, * this is absolutely necessary for any TCP performance whatsoever! * * Note that the returned window info will never be smaller than * DE600_MIN_WINDOW, i.e. 1024 * This differs from the standard function, that can return an * arbitrarily small window! */ #define min(a,b) ((a)<(b)?(a):(b)) static unsigned long de600_rspace(struct sock *sk) { int amt; if (sk != NULL) { /* * Hack! You might want to play with commenting away the following line, * if you know what you do! sk->max_unacked = DE600_MAX_WINDOW - DE600_TCP_WINDOW_DIFF; */ if (sk->rmem_alloc >= sk->rcvbuf-2*DE600_MIN_WINDOW) return(0); amt = min((sk->rcvbuf-sk->rmem_alloc)/2/*-DE600_MIN_WINDOW*/, DE600_MAX_WINDOW); if (amt < 0) return(0); return(amt); } return(0); } #endif #ifdef MODULE char kernel_version[] = UTS_RELEASE; static char nullname[8]; static struct device de600_dev = { nullname, 0, 0, 0, 0, 0, 0, 0, 0, 0, NULL, de600_probe }; int init_module(void) { if (register_netdev(&de600_dev) != 0) return -EIO; return 0; } void cleanup_module(void) { unregister_netdev(&de600_dev); release_region(DE600_IO, 3); } #endif /* MODULE */