diff options
Diffstat (limited to 'drivers/net/ethernet/smsc/smc9194.c')
| -rw-r--r-- | drivers/net/ethernet/smsc/smc9194.c | 1559 |
1 files changed, 1559 insertions, 0 deletions
diff --git a/drivers/net/ethernet/smsc/smc9194.c b/drivers/net/ethernet/smsc/smc9194.c new file mode 100644 index 000000000..67d9fdeed --- /dev/null +++ b/drivers/net/ethernet/smsc/smc9194.c @@ -0,0 +1,1559 @@ +/*------------------------------------------------------------------------ + . smc9194.c + . This is a driver for SMC's 9000 series of Ethernet cards. + . + . Copyright (C) 1996 by Erik Stahlman + . This software may be used and distributed according to the terms + . of the GNU General Public License, incorporated herein by reference. + . + . "Features" of the SMC chip: + . 4608 byte packet memory. ( for the 91C92. Others have more ) + . EEPROM for configuration + . AUI/TP selection ( mine has 10Base2/10BaseT select ) + . + . Arguments: + . io = for the base address + . irq = for the IRQ + . ifport = 0 for autodetect, 1 for TP, 2 for AUI ( or 10base2 ) + . + . author: + . Erik Stahlman ( erik@vt.edu ) + . contributors: + . Arnaldo Carvalho de Melo <acme@conectiva.com.br> + . + . Hardware multicast code from Peter Cammaert ( pc@denkart.be ) + . + . Sources: + . o SMC databook + . o skeleton.c by Donald Becker ( becker@scyld.com ) + . o ( a LOT of advice from Becker as well ) + . + . History: + . 12/07/95 Erik Stahlman written, got receive/xmit handled + . 01/03/96 Erik Stahlman worked out some bugs, actually usable!!! :-) + . 01/06/96 Erik Stahlman cleaned up some, better testing, etc + . 01/29/96 Erik Stahlman fixed autoirq, added multicast + . 02/01/96 Erik Stahlman 1. disabled all interrupts in smc_reset + . 2. got rid of post-decrementing bug -- UGH. + . 02/13/96 Erik Stahlman Tried to fix autoirq failure. Added more + . descriptive error messages. + . 02/15/96 Erik Stahlman Fixed typo that caused detection failure + . 02/23/96 Erik Stahlman Modified it to fit into kernel tree + . Added support to change hardware address + . Cleared stats on opens + . 02/26/96 Erik Stahlman Trial support for Kernel 1.2.13 + . Kludge for automatic IRQ detection + . 03/04/96 Erik Stahlman Fixed kernel 1.3.70 + + . Fixed bug reported by Gardner Buchanan in + . smc_enable, with outw instead of outb + . 03/06/96 Erik Stahlman Added hardware multicast from Peter Cammaert + . 04/14/00 Heiko Pruessing (SMA Regelsysteme) Fixed bug in chip memory + . allocation + . 08/20/00 Arnaldo Melo fix kfree(skb) in smc_hardware_send_packet + . 12/15/00 Christian Jullien fix "Warning: kfree_skb on hard IRQ" + . 11/08/01 Matt Domsch Use common crc32 function + ----------------------------------------------------------------------------*/ + +static const char version[] = + "smc9194.c:v0.14 12/15/00 by Erik Stahlman (erik@vt.edu)"; + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/crc32.h> +#include <linux/errno.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/bitops.h> + +#include <asm/io.h> + +#include "smc9194.h" + +#define DRV_NAME "smc9194" + +/*------------------------------------------------------------------------ + . + . Configuration options, for the experienced user to change. + . + -------------------------------------------------------------------------*/ + +/* + . Do you want to use 32 bit xfers? This should work on all chips, as + . the chipset is designed to accommodate them. +*/ +#ifdef __sh__ +#undef USE_32_BIT +#else +#define USE_32_BIT 1 +#endif + +/* + .the SMC9194 can be at any of the following port addresses. To change, + .for a slightly different card, you can add it to the array. Keep in + .mind that the array must end in zero. +*/ + +struct devlist { + unsigned int port; + unsigned int irq; +}; + +static struct devlist smc_devlist[] __initdata = { + {.port = 0x200, .irq = 0}, + {.port = 0x220, .irq = 0}, + {.port = 0x240, .irq = 0}, + {.port = 0x260, .irq = 0}, + {.port = 0x280, .irq = 0}, + {.port = 0x2A0, .irq = 0}, + {.port = 0x2C0, .irq = 0}, + {.port = 0x2E0, .irq = 0}, + {.port = 0x300, .irq = 0}, + {.port = 0x320, .irq = 0}, + {.port = 0x340, .irq = 0}, + {.port = 0x360, .irq = 0}, + {.port = 0x380, .irq = 0}, + {.port = 0x3A0, .irq = 0}, + {.port = 0x3C0, .irq = 0}, + {.port = 0x3E0, .irq = 0}, + {.port = 0, .irq = 0}, +}; +/* + . Wait time for memory to be free. This probably shouldn't be + . tuned that much, as waiting for this means nothing else happens + . in the system +*/ +#define MEMORY_WAIT_TIME 16 + +/* + . DEBUGGING LEVELS + . + . 0 for normal operation + . 1 for slightly more details + . >2 for various levels of increasingly useless information + . 2 for interrupt tracking, status flags + . 3 for packet dumps, etc. +*/ +#define SMC_DEBUG 0 + +#if (SMC_DEBUG > 2 ) +#define PRINTK3(x) printk x +#else +#define PRINTK3(x) +#endif + +#if SMC_DEBUG > 1 +#define PRINTK2(x) printk x +#else +#define PRINTK2(x) +#endif + +#ifdef SMC_DEBUG +#define PRINTK(x) printk x +#else +#define PRINTK(x) +#endif + + +/*------------------------------------------------------------------------ + . + . The internal workings of the driver. If you are changing anything + . here with the SMC stuff, you should have the datasheet and known + . what you are doing. + . + -------------------------------------------------------------------------*/ +#define CARDNAME "SMC9194" + + +/* store this information for the driver.. */ +struct smc_local { + /* + If I have to wait until memory is available to send + a packet, I will store the skbuff here, until I get the + desired memory. Then, I'll send it out and free it. + */ + struct sk_buff * saved_skb; + + /* + . This keeps track of how many packets that I have + . sent out. When an TX_EMPTY interrupt comes, I know + . that all of these have been sent. + */ + int packets_waiting; +}; + + +/*----------------------------------------------------------------- + . + . The driver can be entered at any of the following entry points. + . + .------------------------------------------------------------------ */ + +/* + . This is called by register_netdev(). It is responsible for + . checking the portlist for the SMC9000 series chipset. If it finds + . one, then it will initialize the device, find the hardware information, + . and sets up the appropriate device parameters. + . NOTE: Interrupts are *OFF* when this procedure is called. + . + . NB:This shouldn't be static since it is referred to externally. +*/ +struct net_device *smc_init(int unit); + +/* + . The kernel calls this function when someone wants to use the device, + . typically 'ifconfig ethX up'. +*/ +static int smc_open(struct net_device *dev); + +/* + . Our watchdog timed out. Called by the networking layer +*/ +static void smc_timeout(struct net_device *dev); + +/* + . This is called by the kernel in response to 'ifconfig ethX down'. It + . is responsible for cleaning up everything that the open routine + . does, and maybe putting the card into a powerdown state. +*/ +static int smc_close(struct net_device *dev); + +/* + . Finally, a call to set promiscuous mode ( for TCPDUMP and related + . programs ) and multicast modes. +*/ +static void smc_set_multicast_list(struct net_device *dev); + + +/*--------------------------------------------------------------- + . + . Interrupt level calls.. + . + ----------------------------------------------------------------*/ + +/* + . Handles the actual interrupt +*/ +static irqreturn_t smc_interrupt(int irq, void *); +/* + . This is a separate procedure to handle the receipt of a packet, to + . leave the interrupt code looking slightly cleaner +*/ +static inline void smc_rcv( struct net_device *dev ); +/* + . This handles a TX interrupt, which is only called when an error + . relating to a packet is sent. +*/ +static inline void smc_tx( struct net_device * dev ); + +/* + ------------------------------------------------------------ + . + . Internal routines + . + ------------------------------------------------------------ +*/ + +/* + . Test if a given location contains a chip, trying to cause as + . little damage as possible if it's not a SMC chip. +*/ +static int smc_probe(struct net_device *dev, int ioaddr); + +/* + . A rather simple routine to print out a packet for debugging purposes. +*/ +#if SMC_DEBUG > 2 +static void print_packet( byte *, int ); +#endif + +#define tx_done(dev) 1 + +/* this is called to actually send the packet to the chip */ +static void smc_hardware_send_packet( struct net_device * dev ); + +/* Since I am not sure if I will have enough room in the chip's ram + . to store the packet, I call this routine, which either sends it + . now, or generates an interrupt when the card is ready for the + . packet */ +static netdev_tx_t smc_wait_to_send_packet( struct sk_buff * skb, + struct net_device *dev ); + +/* this does a soft reset on the device */ +static void smc_reset( int ioaddr ); + +/* Enable Interrupts, Receive, and Transmit */ +static void smc_enable( int ioaddr ); + +/* this puts the device in an inactive state */ +static void smc_shutdown( int ioaddr ); + +/* This routine will find the IRQ of the driver if one is not + . specified in the input to the device. */ +static int smc_findirq( int ioaddr ); + +/* + . Function: smc_reset( int ioaddr ) + . Purpose: + . This sets the SMC91xx chip to its normal state, hopefully from whatever + . mess that any other DOS driver has put it in. + . + . Maybe I should reset more registers to defaults in here? SOFTRESET should + . do that for me. + . + . Method: + . 1. send a SOFT RESET + . 2. wait for it to finish + . 3. enable autorelease mode + . 4. reset the memory management unit + . 5. clear all interrupts + . +*/ +static void smc_reset( int ioaddr ) +{ + /* This resets the registers mostly to defaults, but doesn't + affect EEPROM. That seems unnecessary */ + SMC_SELECT_BANK( 0 ); + outw( RCR_SOFTRESET, ioaddr + RCR ); + + /* this should pause enough for the chip to be happy */ + SMC_DELAY( ); + + /* Set the transmit and receive configuration registers to + default values */ + outw( RCR_CLEAR, ioaddr + RCR ); + outw( TCR_CLEAR, ioaddr + TCR ); + + /* set the control register to automatically + release successfully transmitted packets, to make the best + use out of our limited memory */ + SMC_SELECT_BANK( 1 ); + outw( inw( ioaddr + CONTROL ) | CTL_AUTO_RELEASE , ioaddr + CONTROL ); + + /* Reset the MMU */ + SMC_SELECT_BANK( 2 ); + outw( MC_RESET, ioaddr + MMU_CMD ); + + /* Note: It doesn't seem that waiting for the MMU busy is needed here, + but this is a place where future chipsets _COULD_ break. Be wary + of issuing another MMU command right after this */ + + outb( 0, ioaddr + INT_MASK ); +} + +/* + . Function: smc_enable + . Purpose: let the chip talk to the outside work + . Method: + . 1. Enable the transmitter + . 2. Enable the receiver + . 3. Enable interrupts +*/ +static void smc_enable( int ioaddr ) +{ + SMC_SELECT_BANK( 0 ); + /* see the header file for options in TCR/RCR NORMAL*/ + outw( TCR_NORMAL, ioaddr + TCR ); + outw( RCR_NORMAL, ioaddr + RCR ); + + /* now, enable interrupts */ + SMC_SELECT_BANK( 2 ); + outb( SMC_INTERRUPT_MASK, ioaddr + INT_MASK ); +} + +/* + . Function: smc_shutdown + . Purpose: closes down the SMC91xxx chip. + . Method: + . 1. zero the interrupt mask + . 2. clear the enable receive flag + . 3. clear the enable xmit flags + . + . TODO: + . (1) maybe utilize power down mode. + . Why not yet? Because while the chip will go into power down mode, + . the manual says that it will wake up in response to any I/O requests + . in the register space. Empirical results do not show this working. +*/ +static void smc_shutdown( int ioaddr ) +{ + /* no more interrupts for me */ + SMC_SELECT_BANK( 2 ); + outb( 0, ioaddr + INT_MASK ); + + /* and tell the card to stay away from that nasty outside world */ + SMC_SELECT_BANK( 0 ); + outb( RCR_CLEAR, ioaddr + RCR ); + outb( TCR_CLEAR, ioaddr + TCR ); +#if 0 + /* finally, shut the chip down */ + SMC_SELECT_BANK( 1 ); + outw( inw( ioaddr + CONTROL ), CTL_POWERDOWN, ioaddr + CONTROL ); +#endif +} + + +/* + . Function: smc_setmulticast( int ioaddr, struct net_device *dev ) + . Purpose: + . This sets the internal hardware table to filter out unwanted multicast + . packets before they take up memory. + . + . The SMC chip uses a hash table where the high 6 bits of the CRC of + . address are the offset into the table. If that bit is 1, then the + . multicast packet is accepted. Otherwise, it's dropped silently. + . + . To use the 6 bits as an offset into the table, the high 3 bits are the + . number of the 8 bit register, while the low 3 bits are the bit within + . that register. + . + . This routine is based very heavily on the one provided by Peter Cammaert. +*/ + + +static void smc_setmulticast(int ioaddr, struct net_device *dev) +{ + int i; + unsigned char multicast_table[ 8 ]; + struct netdev_hw_addr *ha; + /* table for flipping the order of 3 bits */ + unsigned char invert3[] = { 0, 4, 2, 6, 1, 5, 3, 7 }; + + /* start with a table of all zeros: reject all */ + memset( multicast_table, 0, sizeof( multicast_table ) ); + + netdev_for_each_mc_addr(ha, dev) { + int position; + + /* only use the low order bits */ + position = ether_crc_le(6, ha->addr) & 0x3f; + + /* do some messy swapping to put the bit in the right spot */ + multicast_table[invert3[position&7]] |= + (1<<invert3[(position>>3)&7]); + + } + /* now, the table can be loaded into the chipset */ + SMC_SELECT_BANK( 3 ); + + for ( i = 0; i < 8 ; i++ ) { + outb( multicast_table[i], ioaddr + MULTICAST1 + i ); + } +} + +/* + . Function: smc_wait_to_send_packet( struct sk_buff * skb, struct net_device * ) + . Purpose: + . Attempt to allocate memory for a packet, if chip-memory is not + . available, then tell the card to generate an interrupt when it + . is available. + . + . Algorithm: + . + . o if the saved_skb is not currently null, then drop this packet + . on the floor. This should never happen, because of TBUSY. + . o if the saved_skb is null, then replace it with the current packet, + . o See if I can sending it now. + . o (NO): Enable interrupts and let the interrupt handler deal with it. + . o (YES):Send it now. +*/ +static netdev_tx_t smc_wait_to_send_packet(struct sk_buff *skb, + struct net_device *dev) +{ + struct smc_local *lp = netdev_priv(dev); + unsigned int ioaddr = dev->base_addr; + word length; + unsigned short numPages; + word time_out; + + netif_stop_queue(dev); + /* Well, I want to send the packet.. but I don't know + if I can send it right now... */ + + if ( lp->saved_skb) { + /* THIS SHOULD NEVER HAPPEN. */ + dev->stats.tx_aborted_errors++; + printk(CARDNAME": Bad Craziness - sent packet while busy.\n" ); + return NETDEV_TX_BUSY; + } + lp->saved_skb = skb; + + length = skb->len; + + if (length < ETH_ZLEN) { + if (skb_padto(skb, ETH_ZLEN)) { + netif_wake_queue(dev); + return NETDEV_TX_OK; + } + length = ETH_ZLEN; + } + + /* + ** The MMU wants the number of pages to be the number of 256 bytes + ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) ) + ** + ** Pkt size for allocating is data length +6 (for additional status words, + ** length and ctl!) If odd size last byte is included in this header. + */ + numPages = ((length & 0xfffe) + 6) / 256; + + if (numPages > 7 ) { + printk(CARDNAME": Far too big packet error.\n"); + /* freeing the packet is a good thing here... but should + . any packets of this size get down here? */ + dev_kfree_skb (skb); + lp->saved_skb = NULL; + /* this IS an error, but, i don't want the skb saved */ + netif_wake_queue(dev); + return NETDEV_TX_OK; + } + /* either way, a packet is waiting now */ + lp->packets_waiting++; + + /* now, try to allocate the memory */ + SMC_SELECT_BANK( 2 ); + outw( MC_ALLOC | numPages, ioaddr + MMU_CMD ); + /* + . Performance Hack + . + . wait a short amount of time.. if I can send a packet now, I send + . it now. Otherwise, I enable an interrupt and wait for one to be + . available. + . + . I could have handled this a slightly different way, by checking to + . see if any memory was available in the FREE MEMORY register. However, + . either way, I need to generate an allocation, and the allocation works + . no matter what, so I saw no point in checking free memory. + */ + time_out = MEMORY_WAIT_TIME; + do { + word status; + + status = inb( ioaddr + INTERRUPT ); + if ( status & IM_ALLOC_INT ) { + /* acknowledge the interrupt */ + outb( IM_ALLOC_INT, ioaddr + INTERRUPT ); + break; + } + } while ( -- time_out ); + + if ( !time_out ) { + /* oh well, wait until the chip finds memory later */ + SMC_ENABLE_INT( IM_ALLOC_INT ); + PRINTK2((CARDNAME": memory allocation deferred.\n")); + /* it's deferred, but I'll handle it later */ + return NETDEV_TX_OK; + } + /* or YES! I can send the packet now.. */ + smc_hardware_send_packet(dev); + netif_wake_queue(dev); + return NETDEV_TX_OK; +} + +/* + . Function: smc_hardware_send_packet(struct net_device * ) + . Purpose: + . This sends the actual packet to the SMC9xxx chip. + . + . Algorithm: + . First, see if a saved_skb is available. + . ( this should NOT be called if there is no 'saved_skb' + . Now, find the packet number that the chip allocated + . Point the data pointers at it in memory + . Set the length word in the chip's memory + . Dump the packet to chip memory + . Check if a last byte is needed ( odd length packet ) + . if so, set the control flag right + . Tell the card to send it + . Enable the transmit interrupt, so I know if it failed + . Free the kernel data if I actually sent it. +*/ +static void smc_hardware_send_packet( struct net_device * dev ) +{ + struct smc_local *lp = netdev_priv(dev); + byte packet_no; + struct sk_buff * skb = lp->saved_skb; + word length; + unsigned int ioaddr; + byte * buf; + + ioaddr = dev->base_addr; + + if ( !skb ) { + PRINTK((CARDNAME": In XMIT with no packet to send\n")); + return; + } + length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; + buf = skb->data; + + /* If I get here, I _know_ there is a packet slot waiting for me */ + packet_no = inb( ioaddr + PNR_ARR + 1 ); + if ( packet_no & 0x80 ) { + /* or isn't there? BAD CHIP! */ + netdev_dbg(dev, CARDNAME": Memory allocation failed.\n"); + dev_kfree_skb_any(skb); + lp->saved_skb = NULL; + netif_wake_queue(dev); + return; + } + + /* we have a packet address, so tell the card to use it */ + outb( packet_no, ioaddr + PNR_ARR ); + + /* point to the beginning of the packet */ + outw( PTR_AUTOINC , ioaddr + POINTER ); + + PRINTK3((CARDNAME": Trying to xmit packet of length %x\n", length)); +#if SMC_DEBUG > 2 + print_packet( buf, length ); +#endif + + /* send the packet length ( +6 for status, length and ctl byte ) + and the status word ( set to zeros ) */ +#ifdef USE_32_BIT + outl( (length +6 ) << 16 , ioaddr + DATA_1 ); +#else + outw( 0, ioaddr + DATA_1 ); + /* send the packet length ( +6 for status words, length, and ctl*/ + outb( (length+6) & 0xFF,ioaddr + DATA_1 ); + outb( (length+6) >> 8 , ioaddr + DATA_1 ); +#endif + + /* send the actual data + . I _think_ it's faster to send the longs first, and then + . mop up by sending the last word. It depends heavily + . on alignment, at least on the 486. Maybe it would be + . a good idea to check which is optimal? But that could take + . almost as much time as is saved? + */ +#ifdef USE_32_BIT + if ( length & 0x2 ) { + outsl(ioaddr + DATA_1, buf, length >> 2 ); + outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1); + } + else + outsl(ioaddr + DATA_1, buf, length >> 2 ); +#else + outsw(ioaddr + DATA_1 , buf, (length ) >> 1); +#endif + /* Send the last byte, if there is one. */ + + if ( (length & 1) == 0 ) { + outw( 0, ioaddr + DATA_1 ); + } else { + outb( buf[length -1 ], ioaddr + DATA_1 ); + outb( 0x20, ioaddr + DATA_1); + } + + /* enable the interrupts */ + SMC_ENABLE_INT( (IM_TX_INT | IM_TX_EMPTY_INT) ); + + /* and let the chipset deal with it */ + outw( MC_ENQUEUE , ioaddr + MMU_CMD ); + + PRINTK2((CARDNAME": Sent packet of length %d\n", length)); + + lp->saved_skb = NULL; + dev_kfree_skb_any (skb); + + dev->trans_start = jiffies; + + /* we can send another packet */ + netif_wake_queue(dev); +} + +/*------------------------------------------------------------------------- + | + | smc_init(int unit) + | Input parameters: + | dev->base_addr == 0, try to find all possible locations + | dev->base_addr == 1, return failure code + | dev->base_addr == 2, always allocate space, and return success + | dev->base_addr == <anything else> this is the address to check + | + | Output: + | pointer to net_device or ERR_PTR(error) + | + --------------------------------------------------------------------------- +*/ +static int io; +static int irq; +static int ifport; + +struct net_device * __init smc_init(int unit) +{ + struct net_device *dev = alloc_etherdev(sizeof(struct smc_local)); + struct devlist *smcdev = smc_devlist; + int err = 0; + + if (!dev) + return ERR_PTR(-ENODEV); + + if (unit >= 0) { + sprintf(dev->name, "eth%d", unit); + netdev_boot_setup_check(dev); + io = dev->base_addr; + irq = dev->irq; + } + + if (io > 0x1ff) { /* Check a single specified location. */ + err = smc_probe(dev, io); + } else if (io != 0) { /* Don't probe at all. */ + err = -ENXIO; + } else { + for (;smcdev->port; smcdev++) { + if (smc_probe(dev, smcdev->port) == 0) + break; + } + if (!smcdev->port) + err = -ENODEV; + } + if (err) + goto out; + err = register_netdev(dev); + if (err) + goto out1; + return dev; +out1: + free_irq(dev->irq, dev); + release_region(dev->base_addr, SMC_IO_EXTENT); +out: + free_netdev(dev); + return ERR_PTR(err); +} + +/*---------------------------------------------------------------------- + . smc_findirq + . + . This routine has a simple purpose -- make the SMC chip generate an + . interrupt, so an auto-detect routine can detect it, and find the IRQ, + ------------------------------------------------------------------------ +*/ +static int __init smc_findirq(int ioaddr) +{ +#ifndef NO_AUTOPROBE + int timeout = 20; + unsigned long cookie; + + + cookie = probe_irq_on(); + + /* + * What I try to do here is trigger an ALLOC_INT. This is done + * by allocating a small chunk of memory, which will give an interrupt + * when done. + */ + + + SMC_SELECT_BANK(2); + /* enable ALLOCation interrupts ONLY */ + outb( IM_ALLOC_INT, ioaddr + INT_MASK ); + + /* + . Allocate 512 bytes of memory. Note that the chip was just + . reset so all the memory is available + */ + outw( MC_ALLOC | 1, ioaddr + MMU_CMD ); + + /* + . Wait until positive that the interrupt has been generated + */ + while ( timeout ) { + byte int_status; + + int_status = inb( ioaddr + INTERRUPT ); + + if ( int_status & IM_ALLOC_INT ) + break; /* got the interrupt */ + timeout--; + } + /* there is really nothing that I can do here if timeout fails, + as probe_irq_off will return a 0 anyway, which is what I + want in this case. Plus, the clean up is needed in both + cases. */ + + /* DELAY HERE! + On a fast machine, the status might change before the interrupt + is given to the processor. This means that the interrupt was + never detected, and probe_irq_off fails to report anything. + This should fix probe_irq_* problems. + */ + SMC_DELAY(); + SMC_DELAY(); + + /* and disable all interrupts again */ + outb( 0, ioaddr + INT_MASK ); + + /* and return what I found */ + return probe_irq_off(cookie); +#else /* NO_AUTOPROBE */ + struct devlist *smcdev; + for (smcdev = smc_devlist; smcdev->port; smcdev++) { + if (smcdev->port == ioaddr) + return smcdev->irq; + } + return 0; +#endif +} + +static const struct net_device_ops smc_netdev_ops = { + .ndo_open = smc_open, + .ndo_stop = smc_close, + .ndo_start_xmit = smc_wait_to_send_packet, + .ndo_tx_timeout = smc_timeout, + .ndo_set_rx_mode = smc_set_multicast_list, + .ndo_change_mtu = eth_change_mtu, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, +}; + +/*---------------------------------------------------------------------- + . Function: smc_probe( int ioaddr ) + . + . Purpose: + . Tests to see if a given ioaddr points to an SMC9xxx chip. + . Returns a 0 on success + . + . Algorithm: + . (1) see if the high byte of BANK_SELECT is 0x33 + . (2) compare the ioaddr with the base register's address + . (3) see if I recognize the chip ID in the appropriate register + . + .--------------------------------------------------------------------- + */ + +/*--------------------------------------------------------------- + . Here I do typical initialization tasks. + . + . o Initialize the structure if needed + . o print out my vanity message if not done so already + . o print out what type of hardware is detected + . o print out the ethernet address + . o find the IRQ + . o set up my private data + . o configure the dev structure with my subroutines + . o actually GRAB the irq. + . o GRAB the region + .----------------------------------------------------------------- +*/ +static int __init smc_probe(struct net_device *dev, int ioaddr) +{ + int i, memory, retval; + unsigned int bank; + + const char *version_string; + const char *if_string; + + /* registers */ + word revision_register; + word base_address_register; + word configuration_register; + word memory_info_register; + word memory_cfg_register; + + /* Grab the region so that no one else tries to probe our ioports. */ + if (!request_region(ioaddr, SMC_IO_EXTENT, DRV_NAME)) + return -EBUSY; + + dev->irq = irq; + dev->if_port = ifport; + + /* First, see if the high byte is 0x33 */ + bank = inw( ioaddr + BANK_SELECT ); + if ( (bank & 0xFF00) != 0x3300 ) { + retval = -ENODEV; + goto err_out; + } + /* The above MIGHT indicate a device, but I need to write to further + test this. */ + outw( 0x0, ioaddr + BANK_SELECT ); + bank = inw( ioaddr + BANK_SELECT ); + if ( (bank & 0xFF00 ) != 0x3300 ) { + retval = -ENODEV; + goto err_out; + } + /* well, we've already written once, so hopefully another time won't + hurt. This time, I need to switch the bank register to bank 1, + so I can access the base address register */ + SMC_SELECT_BANK(1); + base_address_register = inw( ioaddr + BASE ); + if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) ) { + printk(CARDNAME ": IOADDR %x doesn't match configuration (%x). " + "Probably not a SMC chip\n", + ioaddr, base_address_register >> 3 & 0x3E0 ); + /* well, the base address register didn't match. Must not have + been a SMC chip after all. */ + retval = -ENODEV; + goto err_out; + } + + /* check if the revision register is something that I recognize. + These might need to be added to later, as future revisions + could be added. */ + SMC_SELECT_BANK(3); + revision_register = inw( ioaddr + REVISION ); + if ( !chip_ids[ ( revision_register >> 4 ) & 0xF ] ) { + /* I don't recognize this chip, so... */ + printk(CARDNAME ": IO %x: Unrecognized revision register:" + " %x, Contact author.\n", ioaddr, revision_register); + + retval = -ENODEV; + goto err_out; + } + + /* at this point I'll assume that the chip is an SMC9xxx. + It might be prudent to check a listing of MAC addresses + against the hardware address, or do some other tests. */ + + pr_info_once("%s\n", version); + + /* fill in some of the fields */ + dev->base_addr = ioaddr; + + /* + . Get the MAC address ( bank 1, regs 4 - 9 ) + */ + SMC_SELECT_BANK( 1 ); + for ( i = 0; i < 6; i += 2 ) { + word address; + + address = inw( ioaddr + ADDR0 + i ); + dev->dev_addr[ i + 1] = address >> 8; + dev->dev_addr[ i ] = address & 0xFF; + } + + /* get the memory information */ + + SMC_SELECT_BANK( 0 ); + memory_info_register = inw( ioaddr + MIR ); + memory_cfg_register = inw( ioaddr + MCR ); + memory = ( memory_cfg_register >> 9 ) & 0x7; /* multiplier */ + memory *= 256 * ( memory_info_register & 0xFF ); + + /* + Now, I want to find out more about the chip. This is sort of + redundant, but it's cleaner to have it in both, rather than having + one VERY long probe procedure. + */ + SMC_SELECT_BANK(3); + revision_register = inw( ioaddr + REVISION ); + version_string = chip_ids[ ( revision_register >> 4 ) & 0xF ]; + if ( !version_string ) { + /* I shouldn't get here because this call was done before.... */ + retval = -ENODEV; + goto err_out; + } + + /* is it using AUI or 10BaseT ? */ + if ( dev->if_port == 0 ) { + SMC_SELECT_BANK(1); + configuration_register = inw( ioaddr + CONFIG ); + if ( configuration_register & CFG_AUI_SELECT ) + dev->if_port = 2; + else + dev->if_port = 1; + } + if_string = interfaces[ dev->if_port - 1 ]; + + /* now, reset the chip, and put it into a known state */ + smc_reset( ioaddr ); + + /* + . If dev->irq is 0, then the device has to be banged on to see + . what the IRQ is. + . + . This banging doesn't always detect the IRQ, for unknown reasons. + . a workaround is to reset the chip and try again. + . + . Interestingly, the DOS packet driver *SETS* the IRQ on the card to + . be what is requested on the command line. I don't do that, mostly + . because the card that I have uses a non-standard method of accessing + . the IRQs, and because this _should_ work in most configurations. + . + . Specifying an IRQ is done with the assumption that the user knows + . what (s)he is doing. No checking is done!!!! + . + */ + if ( dev->irq < 2 ) { + int trials; + + trials = 3; + while ( trials-- ) { + dev->irq = smc_findirq( ioaddr ); + if ( dev->irq ) + break; + /* kick the card and try again */ + smc_reset( ioaddr ); + } + } + if (dev->irq == 0 ) { + printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.\n"); + retval = -ENODEV; + goto err_out; + } + + /* now, print out the card info, in a short format.. */ + + netdev_info(dev, "%s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ", + version_string, revision_register & 0xF, ioaddr, dev->irq, + if_string, memory); + /* + . Print the Ethernet address + */ + netdev_info(dev, "ADDR: %pM\n", dev->dev_addr); + + /* Grab the IRQ */ + retval = request_irq(dev->irq, smc_interrupt, 0, DRV_NAME, dev); + if (retval) { + netdev_warn(dev, "%s: unable to get IRQ %d (irqval=%d).\n", + DRV_NAME, dev->irq, retval); + goto err_out; + } + + dev->netdev_ops = &smc_netdev_ops; + dev->watchdog_timeo = HZ/20; + + return 0; + +err_out: + release_region(ioaddr, SMC_IO_EXTENT); + return retval; +} + +#if SMC_DEBUG > 2 +static void print_packet( byte * buf, int length ) +{ +#if 0 + int i; + int remainder; + int lines; + + pr_dbg("Packet of length %d\n", length); + lines = length / 16; + remainder = length % 16; + + for ( i = 0; i < lines ; i ++ ) { + int cur; + + printk(KERN_DEBUG); + for ( cur = 0; cur < 8; cur ++ ) { + byte a, b; + + a = *(buf ++ ); + b = *(buf ++ ); + pr_cont("%02x%02x ", a, b); + } + pr_cont("\n"); + } + printk(KERN_DEBUG); + for ( i = 0; i < remainder/2 ; i++ ) { + byte a, b; + + a = *(buf ++ ); + b = *(buf ++ ); + pr_cont("%02x%02x ", a, b); + } + pr_cont("\n"); +#endif +} +#endif + + +/* + * Open and Initialize the board + * + * Set up everything, reset the card, etc .. + * + */ +static int smc_open(struct net_device *dev) +{ + int ioaddr = dev->base_addr; + + int i; /* used to set hw ethernet address */ + + /* clear out all the junk that was put here before... */ + memset(netdev_priv(dev), 0, sizeof(struct smc_local)); + + /* reset the hardware */ + + smc_reset( ioaddr ); + smc_enable( ioaddr ); + + /* Select which interface to use */ + + SMC_SELECT_BANK( 1 ); + if ( dev->if_port == 1 ) { + outw( inw( ioaddr + CONFIG ) & ~CFG_AUI_SELECT, + ioaddr + CONFIG ); + } + else if ( dev->if_port == 2 ) { + outw( inw( ioaddr + CONFIG ) | CFG_AUI_SELECT, + ioaddr + CONFIG ); + } + + /* + According to Becker, I have to set the hardware address + at this point, because the (l)user can set it with an + ioctl. Easily done... + */ + SMC_SELECT_BANK( 1 ); + for ( i = 0; i < 6; i += 2 ) { + word address; + + address = dev->dev_addr[ i + 1 ] << 8 ; + address |= dev->dev_addr[ i ]; + outw( address, ioaddr + ADDR0 + i ); + } + + netif_start_queue(dev); + return 0; +} + +/*-------------------------------------------------------- + . Called by the kernel to send a packet out into the void + . of the net. This routine is largely based on + . skeleton.c, from Becker. + .-------------------------------------------------------- +*/ + +static void smc_timeout(struct net_device *dev) +{ + /* If we get here, some higher level has decided we are broken. + There should really be a "kick me" function call instead. */ + netdev_warn(dev, CARDNAME": transmit timed out, %s?\n", + tx_done(dev) ? "IRQ conflict" : "network cable problem"); + /* "kick" the adaptor */ + smc_reset( dev->base_addr ); + smc_enable( dev->base_addr ); + dev->trans_start = jiffies; /* prevent tx timeout */ + /* clear anything saved */ + ((struct smc_local *)netdev_priv(dev))->saved_skb = NULL; + netif_wake_queue(dev); +} + +/*------------------------------------------------------------- + . + . smc_rcv - receive a packet from the card + . + . There is ( at least ) a packet waiting to be read from + . chip-memory. + . + . o Read the status + . o If an error, record it + . o otherwise, read in the packet + -------------------------------------------------------------- +*/ +static void smc_rcv(struct net_device *dev) +{ + int ioaddr = dev->base_addr; + int packet_number; + word status; + word packet_length; + + /* assume bank 2 */ + + packet_number = inw( ioaddr + FIFO_PORTS ); + + if ( packet_number & FP_RXEMPTY ) { + /* we got called , but nothing was on the FIFO */ + PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO.\n")); + /* don't need to restore anything */ + return; + } + + /* start reading from the start of the packet */ + outw( PTR_READ | PTR_RCV | PTR_AUTOINC, ioaddr + POINTER ); + + /* First two words are status and packet_length */ + status = inw( ioaddr + DATA_1 ); + packet_length = inw( ioaddr + DATA_1 ); + + packet_length &= 0x07ff; /* mask off top bits */ + + PRINTK2(("RCV: STATUS %4x LENGTH %4x\n", status, packet_length )); + /* + . the packet length contains 3 extra words : + . status, length, and an extra word with an odd byte . + */ + packet_length -= 6; + + if ( !(status & RS_ERRORS ) ){ + /* do stuff to make a new packet */ + struct sk_buff * skb; + byte * data; + + /* read one extra byte */ + if ( status & RS_ODDFRAME ) + packet_length++; + + /* set multicast stats */ + if ( status & RS_MULTICAST ) + dev->stats.multicast++; + + skb = netdev_alloc_skb(dev, packet_length + 5); + if ( skb == NULL ) { + dev->stats.rx_dropped++; + goto done; + } + + /* + ! This should work without alignment, but it could be + ! in the worse case + */ + + skb_reserve( skb, 2 ); /* 16 bit alignment */ + + data = skb_put( skb, packet_length); + +#ifdef USE_32_BIT + /* QUESTION: Like in the TX routine, do I want + to send the DWORDs or the bytes first, or some + mixture. A mixture might improve already slow PIO + performance */ + PRINTK3((" Reading %d dwords (and %d bytes)\n", + packet_length >> 2, packet_length & 3 )); + insl(ioaddr + DATA_1 , data, packet_length >> 2 ); + /* read the left over bytes */ + insb( ioaddr + DATA_1, data + (packet_length & 0xFFFFFC), + packet_length & 0x3 ); +#else + PRINTK3((" Reading %d words and %d byte(s)\n", + (packet_length >> 1 ), packet_length & 1 )); + insw(ioaddr + DATA_1 , data, packet_length >> 1); + if ( packet_length & 1 ) { + data += packet_length & ~1; + *(data++) = inb( ioaddr + DATA_1 ); + } +#endif +#if SMC_DEBUG > 2 + print_packet( data, packet_length ); +#endif + + skb->protocol = eth_type_trans(skb, dev ); + netif_rx(skb); + dev->stats.rx_packets++; + dev->stats.rx_bytes += packet_length; + } else { + /* error ... */ + dev->stats.rx_errors++; + + if ( status & RS_ALGNERR ) dev->stats.rx_frame_errors++; + if ( status & (RS_TOOSHORT | RS_TOOLONG ) ) + dev->stats.rx_length_errors++; + if ( status & RS_BADCRC) dev->stats.rx_crc_errors++; + } + +done: + /* error or good, tell the card to get rid of this packet */ + outw( MC_RELEASE, ioaddr + MMU_CMD ); +} + + +/************************************************************************* + . smc_tx + . + . Purpose: Handle a transmit error message. This will only be called + . when an error, because of the AUTO_RELEASE mode. + . + . Algorithm: + . Save pointer and packet no + . Get the packet no from the top of the queue + . check if it's valid ( if not, is this an error??? ) + . read the status word + . record the error + . ( resend? Not really, since we don't want old packets around ) + . Restore saved values + ************************************************************************/ +static void smc_tx( struct net_device * dev ) +{ + int ioaddr = dev->base_addr; + struct smc_local *lp = netdev_priv(dev); + byte saved_packet; + byte packet_no; + word tx_status; + + + /* assume bank 2 */ + + saved_packet = inb( ioaddr + PNR_ARR ); + packet_no = inw( ioaddr + FIFO_PORTS ); + packet_no &= 0x7F; + + /* select this as the packet to read from */ + outb( packet_no, ioaddr + PNR_ARR ); + + /* read the first word from this packet */ + outw( PTR_AUTOINC | PTR_READ, ioaddr + POINTER ); + + tx_status = inw( ioaddr + DATA_1 ); + PRINTK3((CARDNAME": TX DONE STATUS: %4x\n", tx_status)); + + dev->stats.tx_errors++; + if ( tx_status & TS_LOSTCAR ) dev->stats.tx_carrier_errors++; + if ( tx_status & TS_LATCOL ) { + netdev_dbg(dev, CARDNAME": Late collision occurred on last xmit.\n"); + dev->stats.tx_window_errors++; + } +#if 0 + if ( tx_status & TS_16COL ) { ... } +#endif + + if ( tx_status & TS_SUCCESS ) { + netdev_info(dev, CARDNAME": Successful packet caused interrupt\n"); + } + /* re-enable transmit */ + SMC_SELECT_BANK( 0 ); + outw( inw( ioaddr + TCR ) | TCR_ENABLE, ioaddr + TCR ); + + /* kill the packet */ + SMC_SELECT_BANK( 2 ); + outw( MC_FREEPKT, ioaddr + MMU_CMD ); + + /* one less packet waiting for me */ + lp->packets_waiting--; + + outb( saved_packet, ioaddr + PNR_ARR ); +} + +/*-------------------------------------------------------------------- + . + . This is the main routine of the driver, to handle the device when + . it needs some attention. + . + . So: + . first, save state of the chipset + . branch off into routines to handle each case, and acknowledge + . each to the interrupt register + . and finally restore state. + . + ---------------------------------------------------------------------*/ + +static irqreturn_t smc_interrupt(int irq, void * dev_id) +{ + struct net_device *dev = dev_id; + int ioaddr = dev->base_addr; + struct smc_local *lp = netdev_priv(dev); + + byte status; + word card_stats; + byte mask; + int timeout; + /* state registers */ + word saved_bank; + word saved_pointer; + int handled = 0; + + + PRINTK3((CARDNAME": SMC interrupt started\n")); + + saved_bank = inw( ioaddr + BANK_SELECT ); + + SMC_SELECT_BANK(2); + saved_pointer = inw( ioaddr + POINTER ); + + mask = inb( ioaddr + INT_MASK ); + /* clear all interrupts */ + outb( 0, ioaddr + INT_MASK ); + + + /* set a timeout value, so I don't stay here forever */ + timeout = 4; + + PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x\n", mask)); + do { + /* read the status flag, and mask it */ + status = inb( ioaddr + INTERRUPT ) & mask; + if (!status ) + break; + + handled = 1; + + PRINTK3((KERN_WARNING CARDNAME + ": Handling interrupt status %x\n", status)); + + if (status & IM_RCV_INT) { + /* Got a packet(s). */ + PRINTK2((KERN_WARNING CARDNAME + ": Receive Interrupt\n")); + smc_rcv(dev); + } else if (status & IM_TX_INT ) { + PRINTK2((KERN_WARNING CARDNAME + ": TX ERROR handled\n")); + smc_tx(dev); + outb(IM_TX_INT, ioaddr + INTERRUPT ); + } else if (status & IM_TX_EMPTY_INT ) { + /* update stats */ + SMC_SELECT_BANK( 0 ); + card_stats = inw( ioaddr + COUNTER ); + /* single collisions */ + dev->stats.collisions += card_stats & 0xF; + card_stats >>= 4; + /* multiple collisions */ + dev->stats.collisions += card_stats & 0xF; + + /* these are for when linux supports these statistics */ + + SMC_SELECT_BANK( 2 ); + PRINTK2((KERN_WARNING CARDNAME + ": TX_BUFFER_EMPTY handled\n")); + outb( IM_TX_EMPTY_INT, ioaddr + INTERRUPT ); + mask &= ~IM_TX_EMPTY_INT; + dev->stats.tx_packets += lp->packets_waiting; + lp->packets_waiting = 0; + + } else if (status & IM_ALLOC_INT ) { + PRINTK2((KERN_DEBUG CARDNAME + ": Allocation interrupt\n")); + /* clear this interrupt so it doesn't happen again */ + mask &= ~IM_ALLOC_INT; + + smc_hardware_send_packet( dev ); + + /* enable xmit interrupts based on this */ + mask |= ( IM_TX_EMPTY_INT | IM_TX_INT ); + + /* and let the card send more packets to me */ + netif_wake_queue(dev); + + PRINTK2((CARDNAME": Handoff done successfully.\n")); + } else if (status & IM_RX_OVRN_INT ) { + dev->stats.rx_errors++; + dev->stats.rx_fifo_errors++; + outb( IM_RX_OVRN_INT, ioaddr + INTERRUPT ); + } else if (status & IM_EPH_INT ) { + PRINTK((CARDNAME ": UNSUPPORTED: EPH INTERRUPT\n")); + } else if (status & IM_ERCV_INT ) { + PRINTK((CARDNAME ": UNSUPPORTED: ERCV INTERRUPT\n")); + outb( IM_ERCV_INT, ioaddr + INTERRUPT ); + } + } while ( timeout -- ); + + + /* restore state register */ + SMC_SELECT_BANK( 2 ); + outb( mask, ioaddr + INT_MASK ); + + PRINTK3((KERN_WARNING CARDNAME ": MASK is now %x\n", mask)); + outw( saved_pointer, ioaddr + POINTER ); + + SMC_SELECT_BANK( saved_bank ); + + PRINTK3((CARDNAME ": Interrupt done\n")); + return IRQ_RETVAL(handled); +} + + +/*---------------------------------------------------- + . smc_close + . + . this makes the board clean up everything that it can + . and not talk to the outside world. Caused by + . an 'ifconfig ethX down' + . + -----------------------------------------------------*/ +static int smc_close(struct net_device *dev) +{ + netif_stop_queue(dev); + /* clear everything */ + smc_shutdown( dev->base_addr ); + + /* Update the statistics here. */ + return 0; +} + +/*----------------------------------------------------------- + . smc_set_multicast_list + . + . This routine will, depending on the values passed to it, + . either make it accept multicast packets, go into + . promiscuous mode ( for TCPDUMP and cousins ) or accept + . a select set of multicast packets +*/ +static void smc_set_multicast_list(struct net_device *dev) +{ + short ioaddr = dev->base_addr; + + SMC_SELECT_BANK(0); + if ( dev->flags & IFF_PROMISC ) + outw( inw(ioaddr + RCR ) | RCR_PROMISC, ioaddr + RCR ); + +/* BUG? I never disable promiscuous mode if multicasting was turned on. + Now, I turn off promiscuous mode, but I don't do anything to multicasting + when promiscuous mode is turned on. +*/ + + /* Here, I am setting this to accept all multicast packets. + I don't need to zero the multicast table, because the flag is + checked before the table is + */ + else if (dev->flags & IFF_ALLMULTI) + outw( inw(ioaddr + RCR ) | RCR_ALMUL, ioaddr + RCR ); + + /* We just get all multicast packets even if we only want them + . from one source. This will be changed at some future + . point. */ + else if (!netdev_mc_empty(dev)) { + /* support hardware multicasting */ + + /* be sure I get rid of flags I might have set */ + outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL), + ioaddr + RCR ); + /* NOTE: this has to set the bank, so make sure it is the + last thing called. The bank is set to zero at the top */ + smc_setmulticast(ioaddr, dev); + } + else { + outw( inw( ioaddr + RCR ) & ~(RCR_PROMISC | RCR_ALMUL), + ioaddr + RCR ); + + /* + since I'm disabling all multicast entirely, I need to + clear the multicast list + */ + SMC_SELECT_BANK( 3 ); + outw( 0, ioaddr + MULTICAST1 ); + outw( 0, ioaddr + MULTICAST2 ); + outw( 0, ioaddr + MULTICAST3 ); + outw( 0, ioaddr + MULTICAST4 ); + } +} + +#ifdef MODULE + +static struct net_device *devSMC9194; +MODULE_LICENSE("GPL"); + +module_param(io, int, 0); +module_param(irq, int, 0); +module_param(ifport, int, 0); +MODULE_PARM_DESC(io, "SMC 99194 I/O base address"); +MODULE_PARM_DESC(irq, "SMC 99194 IRQ number"); +MODULE_PARM_DESC(ifport, "SMC 99194 interface port (0-default, 1-TP, 2-AUI)"); + +int __init init_module(void) +{ + if (io == 0) + printk(KERN_WARNING + CARDNAME": You shouldn't use auto-probing with insmod!\n" ); + + /* copy the parameters from insmod into the device structure */ + devSMC9194 = smc_init(-1); + return PTR_ERR_OR_ZERO(devSMC9194); +} + +void __exit cleanup_module(void) +{ + unregister_netdev(devSMC9194); + free_irq(devSMC9194->irq, devSMC9194); + release_region(devSMC9194->base_addr, SMC_IO_EXTENT); + free_netdev(devSMC9194); +} + +#endif /* MODULE */ |