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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/de620.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/net/de620.c')
-rw-r--r-- | drivers/net/de620.c | 1047 |
1 files changed, 1047 insertions, 0 deletions
diff --git a/drivers/net/de620.c b/drivers/net/de620.c new file mode 100644 index 0000000..0069f5f --- /dev/null +++ b/drivers/net/de620.c @@ -0,0 +1,1047 @@ +/* + * de620.c $Revision: 1.40 $ BETA + * + * + * Linux driver for the D-Link DE-620 Ethernet pocket adapter. + * + * Portions (C) Copyright 1993, 1994 by Bjorn Ekwall <bj0rn@blox.se> + * + * Based on adapter information gathered from DOS packetdriver + * sources from D-Link Inc: (Special thanks to Henry Ngai of D-Link.) + * Portions (C) Copyright D-Link SYSTEM Inc. 1991, 1992 + * Copyright, 1988, Russell Nelson, Crynwr Software + * + * Adapted to the sample network driver core for linux, + * written by: Donald Becker <becker@super.org> + * (Now at <becker@scyld.com>) + * + * Valuable assistance from: + * J. Joshua Kopper <kopper@rtsg.mot.com> + * Olav Kvittem <Olav.Kvittem@uninett.no> + * Germano Caronni <caronni@nessie.cs.id.ethz.ch> + * Jeremy Fitzhardinge <jeremy@suite.sw.oz.au> + * + *****************************************************************************/ +/* + * 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. + * + *****************************************************************************/ +static const char version[] = + "de620.c: $Revision: 1.40 $, Bjorn Ekwall <bj0rn@blox.se>\n"; + +/*********************************************************************** + * + * "Tuning" section. + * + * Compile-time options: (see below for descriptions) + * -DDE620_IO=0x378 (lpt1) + * -DDE620_IRQ=7 (lpt1) + * -DDE602_DEBUG=... + * -DSHUTDOWN_WHEN_LOST + * -DCOUNT_LOOPS + * -DLOWSPEED + * -DREAD_DELAY + * -DWRITE_DELAY + */ + +/* + * This driver assumes that the printer port is a "normal", + * dumb, uni-directional port! + * If your port is "fancy" in any way, please try to set it to "normal" + * with your BIOS setup. I have no access to machines with bi-directional + * ports, so I can't test such a driver :-( + * (Yes, I _know_ it is possible to use DE620 with bidirectional ports...) + * + * There are some clones of DE620 out there, with different names. + * If the current driver does not recognize a clone, try to change + * the following #define to: + * + * #define DE620_CLONE 1 + */ +#define DE620_CLONE 0 + +/* + * If the adapter has problems with high speeds, enable this #define + * otherwise full printerport speed will be attempted. + * + * You can tune the READ_DELAY/WRITE_DELAY below if you enable LOWSPEED + * +#define LOWSPEED + */ + +#ifndef READ_DELAY +#define READ_DELAY 100 /* adapter internal read delay in 100ns units */ +#endif + +#ifndef WRITE_DELAY +#define WRITE_DELAY 100 /* adapter internal write delay in 100ns units */ +#endif + +/* + * 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. + * +#define SHUTDOWN_WHEN_LOST + */ + +/* + * Enable debugging by "-DDE620_DEBUG=3" when compiling, + * OR by enabling the following #define + * + * use 0 for production, 1 for verification, >2 for debug + * +#define DE620_DEBUG 3 + */ + +#ifdef LOWSPEED +/* + * Enable this #define if you want to see debugging output that show how long + * we have to wait before the DE-620 is ready for the next read/write/command. + * +#define COUNT_LOOPS + */ +#endif + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +#include <asm/io.h> +#include <asm/system.h> + +/* Constant definitions for the DE-620 registers, commands and bits */ +#include "de620.h" + +typedef unsigned char byte; + +/******************************************************* + * * + * Definition of D-Link DE-620 Ethernet Pocket adapter * + * See also "de620.h" * + * * + *******************************************************/ +#ifndef DE620_IO /* Compile-time configurable */ +#define DE620_IO 0x378 +#endif + +#ifndef DE620_IRQ /* Compile-time configurable */ +#define DE620_IRQ 7 +#endif + +#define DATA_PORT (dev->base_addr) +#define STATUS_PORT (dev->base_addr + 1) +#define COMMAND_PORT (dev->base_addr + 2) + +#define RUNT 60 /* Too small Ethernet packet */ +#define GIANT 1514 /* largest legal size packet, no fcs */ + +#ifdef DE620_DEBUG /* Compile-time configurable */ +#define PRINTK(x) if (de620_debug >= 2) printk x +#else +#define DE620_DEBUG 0 +#define PRINTK(x) /**/ +#endif + + +/* + * Force media with insmod: + * insmod de620.o bnc=1 + * or + * insmod de620.o utp=1 + * + * Force io and/or irq with insmod: + * insmod de620.o io=0x378 irq=7 + * + * Make a clone skip the Ethernet-address range check: + * insmod de620.o clone=1 + */ +static int bnc; +static int utp; +static int io = DE620_IO; +static int irq = DE620_IRQ; +static int clone = DE620_CLONE; + +static unsigned int de620_debug = DE620_DEBUG; + +static spinlock_t de620_lock; + +module_param(bnc, int, 0); +module_param(utp, int, 0); +module_param(io, int, 0); +module_param(irq, int, 0); +module_param(clone, int, 0); +module_param(de620_debug, int, 0); +MODULE_PARM_DESC(bnc, "DE-620 set BNC medium (0-1)"); +MODULE_PARM_DESC(utp, "DE-620 set UTP medium (0-1)"); +MODULE_PARM_DESC(io, "DE-620 I/O base address,required"); +MODULE_PARM_DESC(irq, "DE-620 IRQ number,required"); +MODULE_PARM_DESC(clone, "Check also for non-D-Link DE-620 clones (0-1)"); +MODULE_PARM_DESC(de620_debug, "DE-620 debug level (0-2)"); + +/*********************************************** + * * + * Index to functions, as function prototypes. * + * * + ***********************************************/ + +/* + * Routines used internally. (See also "convenience macros.. below") + */ + +/* Put in the device structure. */ +static int de620_open(struct net_device *); +static int de620_close(struct net_device *); +static struct net_device_stats *get_stats(struct net_device *); +static void de620_set_multicast_list(struct net_device *); +static int de620_start_xmit(struct sk_buff *, struct net_device *); + +/* Dispatch from interrupts. */ +static irqreturn_t de620_interrupt(int, void *, struct pt_regs *); +static int de620_rx_intr(struct net_device *); + +/* Initialization */ +static int adapter_init(struct net_device *); +static int read_eeprom(struct net_device *); + + +/* + * D-Link driver variables: + */ +#define SCR_DEF NIBBLEMODE |INTON | SLEEP | AUTOTX +#define TCR_DEF RXPB /* not used: | TXSUCINT | T16INT */ +#define DE620_RX_START_PAGE 12 /* 12 pages (=3k) reserved for tx */ +#define DEF_NIC_CMD IRQEN | ICEN | DS1 + +static volatile byte NIC_Cmd; +static volatile byte next_rx_page; +static byte first_rx_page; +static byte last_rx_page; +static byte EIPRegister; + +static struct nic { + byte NodeID[6]; + byte RAM_Size; + byte Model; + byte Media; + byte SCR; +} nic_data; + +/********************************************************** + * * + * Convenience macros/functions for D-Link DE-620 adapter * + * * + **********************************************************/ +#define de620_tx_buffs(dd) (inb(STATUS_PORT) & (TXBF0 | TXBF1)) +#define de620_flip_ds(dd) NIC_Cmd ^= DS0 | DS1; outb(NIC_Cmd, COMMAND_PORT); + +/* Check for ready-status, and return a nibble (high 4 bits) for data input */ +#ifdef COUNT_LOOPS +static int tot_cnt; +#endif +static inline byte +de620_ready(struct net_device *dev) +{ + byte value; + register short int cnt = 0; + + while ((((value = inb(STATUS_PORT)) & READY) == 0) && (cnt <= 1000)) + ++cnt; + +#ifdef COUNT_LOOPS + tot_cnt += cnt; +#endif + return value & 0xf0; /* nibble */ +} + +static inline void +de620_send_command(struct net_device *dev, byte cmd) +{ + de620_ready(dev); + if (cmd == W_DUMMY) + outb(NIC_Cmd, COMMAND_PORT); + + outb(cmd, DATA_PORT); + + outb(NIC_Cmd ^ CS0, COMMAND_PORT); + de620_ready(dev); + outb(NIC_Cmd, COMMAND_PORT); +} + +static inline void +de620_put_byte(struct net_device *dev, byte value) +{ + /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ + de620_ready(dev); + outb(value, DATA_PORT); + de620_flip_ds(dev); +} + +static inline byte +de620_read_byte(struct net_device *dev) +{ + byte value; + + /* The de620_ready() makes 7 loops, on the average, on a DX2/66 */ + value = de620_ready(dev); /* High nibble */ + de620_flip_ds(dev); + value |= de620_ready(dev) >> 4; /* Low nibble */ + return value; +} + +static inline void +de620_write_block(struct net_device *dev, byte *buffer, int count, int pad) +{ +#ifndef LOWSPEED + byte uflip = NIC_Cmd ^ (DS0 | DS1); + byte dflip = NIC_Cmd; +#else /* LOWSPEED */ +#ifdef COUNT_LOOPS + int bytes = count; +#endif /* COUNT_LOOPS */ +#endif /* LOWSPEED */ + +#ifdef LOWSPEED +#ifdef COUNT_LOOPS + tot_cnt = 0; +#endif /* COUNT_LOOPS */ + /* No further optimization useful, the limit is in the adapter. */ + for ( ; count > 0; --count, ++buffer) { + de620_put_byte(dev,*buffer); + } + for ( count = pad ; count > 0; --count, ++buffer) { + de620_put_byte(dev, 0); + } + de620_send_command(dev,W_DUMMY); +#ifdef COUNT_LOOPS + /* trial debug output: loops per byte in de620_ready() */ + printk("WRITE(%d)\n", tot_cnt/((bytes?bytes:1))); +#endif /* COUNT_LOOPS */ +#else /* not LOWSPEED */ + for ( ; count > 0; count -=2) { + outb(*buffer++, DATA_PORT); + outb(uflip, COMMAND_PORT); + outb(*buffer++, DATA_PORT); + outb(dflip, COMMAND_PORT); + } + de620_send_command(dev,W_DUMMY); +#endif /* LOWSPEED */ +} + +static inline void +de620_read_block(struct net_device *dev, byte *data, int count) +{ +#ifndef LOWSPEED + byte value; + byte uflip = NIC_Cmd ^ (DS0 | DS1); + byte dflip = NIC_Cmd; +#else /* LOWSPEED */ +#ifdef COUNT_LOOPS + int bytes = count; + + tot_cnt = 0; +#endif /* COUNT_LOOPS */ +#endif /* LOWSPEED */ + +#ifdef LOWSPEED + /* No further optimization useful, the limit is in the adapter. */ + while (count-- > 0) { + *data++ = de620_read_byte(dev); + de620_flip_ds(dev); + } +#ifdef COUNT_LOOPS + /* trial debug output: loops per byte in de620_ready() */ + printk("READ(%d)\n", tot_cnt/(2*(bytes?bytes:1))); +#endif /* COUNT_LOOPS */ +#else /* not LOWSPEED */ + while (count-- > 0) { + value = inb(STATUS_PORT) & 0xf0; /* High nibble */ + outb(uflip, COMMAND_PORT); + *data++ = value | inb(STATUS_PORT) >> 4; /* Low nibble */ + outb(dflip , COMMAND_PORT); + } +#endif /* LOWSPEED */ +} + +static inline void +de620_set_delay(struct net_device *dev) +{ + de620_ready(dev); + outb(W_DFR, DATA_PORT); + outb(NIC_Cmd ^ CS0, COMMAND_PORT); + + de620_ready(dev); +#ifdef LOWSPEED + outb(WRITE_DELAY, DATA_PORT); +#else + outb(0, DATA_PORT); +#endif + de620_flip_ds(dev); + + de620_ready(dev); +#ifdef LOWSPEED + outb(READ_DELAY, DATA_PORT); +#else + outb(0, DATA_PORT); +#endif + de620_flip_ds(dev); +} + +static inline void +de620_set_register(struct net_device *dev, byte reg, byte value) +{ + de620_ready(dev); + outb(reg, DATA_PORT); + outb(NIC_Cmd ^ CS0, COMMAND_PORT); + + de620_put_byte(dev, value); +} + +static inline byte +de620_get_register(struct net_device *dev, byte reg) +{ + byte value; + + de620_send_command(dev,reg); + value = de620_read_byte(dev); + de620_send_command(dev,W_DUMMY); + + return value; +} + +/********************************************************************* + * + * Open/initialize the board. + * + * 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 de620_open(struct net_device *dev) +{ + int ret = request_irq(dev->irq, de620_interrupt, 0, dev->name, dev); + if (ret) { + printk (KERN_ERR "%s: unable to get IRQ %d\n", dev->name, dev->irq); + return ret; + } + + if (adapter_init(dev)) { + ret = -EIO; + goto out_free_irq; + } + + netif_start_queue(dev); + return 0; + +out_free_irq: + free_irq(dev->irq, dev); + return ret; +} + +/************************************************ + * + * The inverse routine to de620_open(). + * + */ + +static int de620_close(struct net_device *dev) +{ + netif_stop_queue(dev); + /* disable recv */ + de620_set_register(dev, W_TCR, RXOFF); + free_irq(dev->irq, dev); + return 0; +} + +/********************************************* + * + * Return current statistics + * + */ +static struct net_device_stats *get_stats(struct net_device *dev) +{ + return (struct net_device_stats *)(dev->priv); +} + +/********************************************* + * + * Set or clear the multicast filter for this adaptor. + * (no real multicast implemented for the DE-620, but she can be promiscuous...) + * + */ + +static void de620_set_multicast_list(struct net_device *dev) +{ + if (dev->mc_count || dev->flags&(IFF_ALLMULTI|IFF_PROMISC)) + { /* Enable promiscuous mode */ + /* + * We must make the kernel realise we had to move + * into promisc mode or we start all out war on + * the cable. - AC + */ + dev->flags|=IFF_PROMISC; + + de620_set_register(dev, W_TCR, (TCR_DEF & ~RXPBM) | RXALL); + } + else + { /* Disable promiscuous mode, use normal mode */ + de620_set_register(dev, W_TCR, TCR_DEF); + } +} + +/******************************************************* + * + * Handle timeouts on transmit + */ + +static void de620_timeout(struct net_device *dev) +{ + printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, "network cable problem"); + /* Restart the adapter. */ + if (!adapter_init(dev)) /* maybe close it */ + netif_wake_queue(dev); +} + +/******************************************************* + * + * Copy a buffer to the adapter transmit page memory. + * Start sending. + */ +static int de620_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + unsigned long flags; + int len; + byte *buffer = skb->data; + byte using_txbuf; + + using_txbuf = de620_tx_buffs(dev); /* Peek at the adapter */ + + netif_stop_queue(dev); + + + if ((len = skb->len) < RUNT) + len = RUNT; + if (len & 1) /* send an even number of bytes */ + ++len; + + /* Start real output */ + + spin_lock_irqsave(&de620_lock, flags) + PRINTK(("de620_start_xmit: len=%d, bufs 0x%02x\n", + (int)skb->len, using_txbuf)); + + /* select a free tx buffer. if there is one... */ + switch (using_txbuf) { + default: /* both are free: use TXBF0 */ + case TXBF1: /* use TXBF0 */ + de620_send_command(dev,W_CR | RW0); + using_txbuf |= TXBF0; + break; + + case TXBF0: /* use TXBF1 */ + de620_send_command(dev,W_CR | RW1); + using_txbuf |= TXBF1; + break; + + case (TXBF0 | TXBF1): /* NONE!!! */ + printk(KERN_WARNING "%s: No tx-buffer available!\n", dev->name); + spin_unlock_irqrestore(&de620_lock, flags); + return 1; + } + de620_write_block(dev, buffer, skb->len, len-skb->len); + + dev->trans_start = jiffies; + if(!(using_txbuf == (TXBF0 | TXBF1))) + netif_wake_queue(dev); + + ((struct net_device_stats *)(dev->priv))->tx_packets++; + spin_unlock_irqrestore(&de620_lock, flags); + dev_kfree_skb (skb); + return 0; +} + +/***************************************************** + * + * Handle the network interface interrupts. + * + */ +static irqreturn_t +de620_interrupt(int irq_in, void *dev_id, struct pt_regs *regs) +{ + struct net_device *dev = dev_id; + byte irq_status; + int bogus_count = 0; + int again = 0; + + spin_lock(&de620_lock); + + /* Read the status register (_not_ the status port) */ + irq_status = de620_get_register(dev, R_STS); + + PRINTK(("de620_interrupt (%2.2X)\n", irq_status)); + + if (irq_status & RXGOOD) { + do { + again = de620_rx_intr(dev); + PRINTK(("again=%d\n", again)); + } + while (again && (++bogus_count < 100)); + } + + if(de620_tx_buffs(dev) != (TXBF0 | TXBF1)) + netif_wake_queue(dev); + + spin_unlock(&de620_lock); + return IRQ_HANDLED; +} + +/************************************** + * + * Get a packet from the adapter + * + * Send it "upstairs" + * + */ +static int de620_rx_intr(struct net_device *dev) +{ + struct header_buf { + byte status; + byte Rx_NextPage; + unsigned short Rx_ByteCount; + } header_buf; + struct sk_buff *skb; + int size; + byte *buffer; + byte pagelink; + byte curr_page; + + PRINTK(("de620_rx_intr: next_rx_page = %d\n", next_rx_page)); + + /* Tell the adapter that we are going to read data, and from where */ + de620_send_command(dev, W_CR | RRN); + de620_set_register(dev, W_RSA1, next_rx_page); + de620_set_register(dev, W_RSA0, 0); + + /* Deep breath, and away we goooooo */ + de620_read_block(dev, (byte *)&header_buf, sizeof(struct header_buf)); + PRINTK(("page status=0x%02x, nextpage=%d, packetsize=%d\n", + header_buf.status, header_buf.Rx_NextPage, header_buf.Rx_ByteCount)); + + /* Plausible page header? */ + pagelink = header_buf.Rx_NextPage; + if ((pagelink < first_rx_page) || (last_rx_page < pagelink)) { + /* Ouch... Forget it! Skip all and start afresh... */ + printk(KERN_WARNING "%s: Ring overrun? Restoring...\n", dev->name); + /* You win some, you lose some. And sometimes plenty... */ + adapter_init(dev); + netif_wake_queue(dev); + ((struct net_device_stats *)(dev->priv))->rx_over_errors++; + return 0; + } + + /* OK, this look good, so far. Let's see if it's consistent... */ + /* Let's compute the start of the next packet, based on where we are */ + pagelink = next_rx_page + + ((header_buf.Rx_ByteCount + (4 - 1 + 0x100)) >> 8); + + /* Are we going to wrap around the page counter? */ + if (pagelink > last_rx_page) + pagelink -= (last_rx_page - first_rx_page + 1); + + /* Is the _computed_ next page number equal to what the adapter says? */ + if (pagelink != header_buf.Rx_NextPage) { + /* Naah, we'll skip this packet. Probably bogus data as well */ + printk(KERN_WARNING "%s: Page link out of sync! Restoring...\n", dev->name); + next_rx_page = header_buf.Rx_NextPage; /* at least a try... */ + de620_send_command(dev, W_DUMMY); + de620_set_register(dev, W_NPRF, next_rx_page); + ((struct net_device_stats *)(dev->priv))->rx_over_errors++; + return 0; + } + next_rx_page = pagelink; + + size = header_buf.Rx_ByteCount - 4; + if ((size < RUNT) || (GIANT < size)) { + printk(KERN_WARNING "%s: Illegal packet size: %d!\n", dev->name, size); + } + else { /* Good packet? */ + skb = dev_alloc_skb(size+2); + if (skb == NULL) { /* Yeah, but no place to put it... */ + printk(KERN_WARNING "%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size); + ((struct net_device_stats *)(dev->priv))->rx_dropped++; + } + else { /* Yep! Go get it! */ + skb_reserve(skb,2); /* Align */ + skb->dev = dev; + /* skb->data points to the start of sk_buff data area */ + buffer = skb_put(skb,size); + /* copy the packet into the buffer */ + de620_read_block(dev, buffer, size); + PRINTK(("Read %d bytes\n", size)); + skb->protocol=eth_type_trans(skb,dev); + netif_rx(skb); /* deliver it "upstairs" */ + dev->last_rx = jiffies; + /* count all receives */ + ((struct net_device_stats *)(dev->priv))->rx_packets++; + ((struct net_device_stats *)(dev->priv))->rx_bytes += size; + } + } + + /* Let's peek ahead to see if we have read the last current packet */ + /* NOTE! We're _not_ checking the 'EMPTY'-flag! This seems better... */ + curr_page = de620_get_register(dev, R_CPR); + de620_set_register(dev, W_NPRF, next_rx_page); + PRINTK(("next_rx_page=%d CPR=%d\n", next_rx_page, curr_page)); + + return (next_rx_page != curr_page); /* That was slightly tricky... */ +} + +/********************************************* + * + * Reset the adapter to a known state + * + */ +static int adapter_init(struct net_device *dev) +{ + int i; + static int was_down; + + if ((nic_data.Model == 3) || (nic_data.Model == 0)) { /* CT */ + EIPRegister = NCTL0; + if (nic_data.Media != 1) + EIPRegister |= NIS0; /* not BNC */ + } + else if (nic_data.Model == 2) { /* UTP */ + EIPRegister = NCTL0 | NIS0; + } + + if (utp) + EIPRegister = NCTL0 | NIS0; + if (bnc) + EIPRegister = NCTL0; + + de620_send_command(dev, W_CR | RNOP | CLEAR); + de620_send_command(dev, W_CR | RNOP); + + de620_set_register(dev, W_SCR, SCR_DEF); + /* disable recv to wait init */ + de620_set_register(dev, W_TCR, RXOFF); + + /* Set the node ID in the adapter */ + for (i = 0; i < 6; ++i) { /* W_PARn = 0xaa + n */ + de620_set_register(dev, W_PAR0 + i, dev->dev_addr[i]); + } + + de620_set_register(dev, W_EIP, EIPRegister); + + next_rx_page = first_rx_page = DE620_RX_START_PAGE; + if (nic_data.RAM_Size) + last_rx_page = nic_data.RAM_Size - 1; + else /* 64k RAM */ + last_rx_page = 255; + + de620_set_register(dev, W_SPR, first_rx_page); /* Start Page Register*/ + de620_set_register(dev, W_EPR, last_rx_page); /* End Page Register */ + de620_set_register(dev, W_CPR, first_rx_page);/*Current Page Register*/ + de620_send_command(dev, W_NPR | first_rx_page); /* Next Page Register*/ + de620_send_command(dev, W_DUMMY); + de620_set_delay(dev); + + /* Final sanity check: Anybody out there? */ + /* Let's hope some bits from the statusregister make a good check */ +#define CHECK_MASK ( 0 | TXSUC | T16 | 0 | RXCRC | RXSHORT | 0 | 0 ) +#define CHECK_OK ( 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 ) + /* success: X 0 0 X 0 0 X X */ + /* ignore: EEDI RXGOOD COLS LNKS*/ + + if (((i = de620_get_register(dev, R_STS)) & CHECK_MASK) != CHECK_OK) { + printk(KERN_ERR "%s: Something has happened to the DE-620! Please check it" +#ifdef SHUTDOWN_WHEN_LOST + " and do a new ifconfig" +#endif + "! (%02x)\n", dev->name, i); +#ifdef SHUTDOWN_WHEN_LOST + /* Goodbye, cruel world... */ + dev->flags &= ~IFF_UP; + de620_close(dev); +#endif + was_down = 1; + return 1; /* failed */ + } + if (was_down) { + printk(KERN_WARNING "%s: Thanks, I feel much better now!\n", dev->name); + was_down = 0; + } + + /* All OK, go ahead... */ + de620_set_register(dev, W_TCR, TCR_DEF); + + return 0; /* all ok */ +} + +/****************************************************************************** + * + * Only start-up code below + * + */ +/**************************************** + * + * Check if there is a DE-620 connected + */ +struct net_device * __init de620_probe(int unit) +{ + byte checkbyte = 0xa5; + struct net_device *dev; + int err = -ENOMEM; + int i; + + dev = alloc_etherdev(sizeof(struct net_device_stats)); + if (!dev) + goto out; + + SET_MODULE_OWNER(dev); + + spin_lock_init(&de620_lock); + + /* + * This is where the base_addr and irq gets set. + * Tunable at compile-time and insmod-time + */ + dev->base_addr = io; + dev->irq = irq; + + /* allow overriding parameters on command line */ + if (unit >= 0) { + sprintf(dev->name, "eth%d", unit); + netdev_boot_setup_check(dev); + } + + if (de620_debug) + printk(version); + + printk(KERN_INFO "D-Link DE-620 pocket adapter"); + + if (!request_region(dev->base_addr, 3, "de620")) { + printk(" io 0x%3lX, which is busy.\n", dev->base_addr); + err = -EBUSY; + goto out1; + } + + /* Initially, configure basic nibble mode, so we can read the EEPROM */ + NIC_Cmd = DEF_NIC_CMD; + de620_set_register(dev, W_EIP, EIPRegister); + + /* Anybody out there? */ + de620_set_register(dev, W_CPR, checkbyte); + checkbyte = de620_get_register(dev, R_CPR); + + if ((checkbyte != 0xa5) || (read_eeprom(dev) != 0)) { + printk(" not identified in the printer port\n"); + err = -ENODEV; + goto out2; + } + + /* else, got it! */ + printk(", Ethernet Address: %2.2X", + dev->dev_addr[0] = nic_data.NodeID[0]); + for (i = 1; i < ETH_ALEN; i++) { + printk(":%2.2X", dev->dev_addr[i] = nic_data.NodeID[i]); + dev->broadcast[i] = 0xff; + } + + printk(" (%dk RAM,", + (nic_data.RAM_Size) ? (nic_data.RAM_Size >> 2) : 64); + + if (nic_data.Media == 1) + printk(" BNC)\n"); + else + printk(" UTP)\n"); + + dev->get_stats = get_stats; + dev->open = de620_open; + dev->stop = de620_close; + dev->hard_start_xmit = de620_start_xmit; + dev->tx_timeout = de620_timeout; + dev->watchdog_timeo = HZ*2; + dev->set_multicast_list = de620_set_multicast_list; + + /* base_addr and irq are already set, see above! */ + + /* dump eeprom */ + if (de620_debug) { + printk("\nEEPROM contents:\n"); + printk("RAM_Size = 0x%02X\n", nic_data.RAM_Size); + printk("NodeID = %02X:%02X:%02X:%02X:%02X:%02X\n", + nic_data.NodeID[0], nic_data.NodeID[1], + nic_data.NodeID[2], nic_data.NodeID[3], + nic_data.NodeID[4], nic_data.NodeID[5]); + printk("Model = %d\n", nic_data.Model); + printk("Media = %d\n", nic_data.Media); + printk("SCR = 0x%02x\n", nic_data.SCR); + } + + err = register_netdev(dev); + if (err) + goto out2; + return dev; + +out2: + release_region(dev->base_addr, 3); +out1: + free_netdev(dev); +out: + return ERR_PTR(err); +} + +/********************************** + * + * Read info from on-board EEPROM + * + * Note: Bitwise serial I/O to/from the EEPROM vi the status _register_! + */ +#define sendit(dev,data) de620_set_register(dev, W_EIP, data | EIPRegister); + +static unsigned short __init ReadAWord(struct net_device *dev, int from) +{ + unsigned short data; + int nbits; + + /* cs [__~~] SET SEND STATE */ + /* di [____] */ + /* sck [_~~_] */ + sendit(dev, 0); sendit(dev, 1); sendit(dev, 5); sendit(dev, 4); + + /* Send the 9-bit address from where we want to read the 16-bit word */ + for (nbits = 9; nbits > 0; --nbits, from <<= 1) { + if (from & 0x0100) { /* bit set? */ + /* cs [~~~~] SEND 1 */ + /* di [~~~~] */ + /* sck [_~~_] */ + sendit(dev, 6); sendit(dev, 7); sendit(dev, 7); sendit(dev, 6); + } + else { + /* cs [~~~~] SEND 0 */ + /* di [____] */ + /* sck [_~~_] */ + sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); + } + } + + /* Shift in the 16-bit word. The bits appear serially in EEDI (=0x80) */ + for (data = 0, nbits = 16; nbits > 0; --nbits) { + /* cs [~~~~] SEND 0 */ + /* di [____] */ + /* sck [_~~_] */ + sendit(dev, 4); sendit(dev, 5); sendit(dev, 5); sendit(dev, 4); + data = (data << 1) | ((de620_get_register(dev, R_STS) & EEDI) >> 7); + } + /* cs [____] RESET SEND STATE */ + /* di [____] */ + /* sck [_~~_] */ + sendit(dev, 0); sendit(dev, 1); sendit(dev, 1); sendit(dev, 0); + + return data; +} + +static int __init read_eeprom(struct net_device *dev) +{ + unsigned short wrd; + + /* D-Link Ethernet addresses are in the series 00:80:c8:7X:XX:XX:XX */ + wrd = ReadAWord(dev, 0x1aa); /* bytes 0 + 1 of NodeID */ + if (!clone && (wrd != htons(0x0080))) /* Valid D-Link ether sequence? */ + return -1; /* Nope, not a DE-620 */ + nic_data.NodeID[0] = wrd & 0xff; + nic_data.NodeID[1] = wrd >> 8; + + wrd = ReadAWord(dev, 0x1ab); /* bytes 2 + 3 of NodeID */ + if (!clone && ((wrd & 0xff) != 0xc8)) /* Valid D-Link ether sequence? */ + return -1; /* Nope, not a DE-620 */ + nic_data.NodeID[2] = wrd & 0xff; + nic_data.NodeID[3] = wrd >> 8; + + wrd = ReadAWord(dev, 0x1ac); /* bytes 4 + 5 of NodeID */ + nic_data.NodeID[4] = wrd & 0xff; + nic_data.NodeID[5] = wrd >> 8; + + wrd = ReadAWord(dev, 0x1ad); /* RAM size in pages (256 bytes). 0 = 64k */ + nic_data.RAM_Size = (wrd >> 8); + + wrd = ReadAWord(dev, 0x1ae); /* hardware model (CT = 3) */ + nic_data.Model = (wrd & 0xff); + + wrd = ReadAWord(dev, 0x1af); /* media (indicates BNC/UTP) */ + nic_data.Media = (wrd & 0xff); + + wrd = ReadAWord(dev, 0x1a8); /* System Configuration Register */ + nic_data.SCR = (wrd >> 8); + + return 0; /* no errors */ +} + +/****************************************************************************** + * + * Loadable module skeleton + * + */ +#ifdef MODULE +static struct net_device *de620_dev; + +int init_module(void) +{ + de620_dev = de620_probe(-1); + if (IS_ERR(de620_dev)) + return PTR_ERR(de620_dev); + return 0; +} + +void cleanup_module(void) +{ + unregister_netdev(de620_dev); + release_region(de620_dev->base_addr, 3); + free_netdev(de620_dev); +} +#endif /* MODULE */ +MODULE_LICENSE("GPL"); + + +/* + * (add '-DMODULE' when compiling as loadable module) + * + * compile-command: + * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -O2 \ + * -fomit-frame-pointer -m486 \ + * -I/usr/src/linux/include -I../../net/inet -c de620.c +*/ +/* + * Local variables: + * kernel-compile-command: "gcc -D__KERNEL__ -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c" + * module-compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c" + * compile-command: "gcc -D__KERNEL__ -DMODULE -Ilinux/include -I../../net/inet -Wall -Wstrict-prototypes -O2 -m486 -c de620.c" + * End: + */ |