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kernel_optimize_test/drivers/net/smc9194.c
Joe Perches a4b770972b drivers/net: Remove unnecessary returns from void function()s 
This patch removes from drivers/net/ all the unnecessary
return; statements that precede the last closing brace of
void functions.

It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.

It also does not remove null void functions with return.

Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
  xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

with some cleanups by hand.

Compile tested x86 allmodconfig only.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-14 00:19:28 -07:00

1595 lines
43 KiB
C
Raw Blame History

/*------------------------------------------------------------------------
. 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)\n";
#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
#if defined(__H8300H__) || defined(__H8300S__)
#define NO_AUTOPROBE
#undef insl
#undef outsl
#define insl(a,b,l) io_insl_noswap(a,b,l)
#define outsl(a,b,l) io_outsl_noswap(a,b,l)
#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;
};
#if defined(CONFIG_H8S_EDOSK2674)
static struct devlist smc_devlist[] __initdata = {
{.port = 0xf80000, .irq = 16},
{.port = 0, .irq = 0 },
};
#else
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},
};
#endif
/*
. 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;
/* make sure this is a multicast address - shouldn't this
be a given if we have it here ? */
if (!(*ha->addr & 1))
continue;
/* 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! */
printk(KERN_DEBUG 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 );
#if !defined(__H8300H__) && !defined(__H8300S__)
outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
#else
ctrl_outw( *((word *)(buf + (length & 0xFFFFFFFC))),ioaddr +DATA_1);
#endif
}
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_multicast_list = 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;
static unsigned version_printed;
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;
}
#if !defined(CONFIG_H8S_EDOSK2674)
/* 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;
}
#else
(void)base_address_register; /* Warning suppression */
#endif
/* 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. */
if (version_printed++ == 0)
printk("%s", 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.. */
printk("%s: %s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ", dev->name,
version_string, revision_register & 0xF, ioaddr, dev->irq,
if_string, memory );
/*
. Print the Ethernet address
*/
printk("ADDR: %pM\n", dev->dev_addr);
/* Grab the IRQ */
retval = request_irq(dev->irq, smc_interrupt, 0, DRV_NAME, dev);
if (retval) {
printk("%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;
printk("Packet of length %d\n", length);
lines = length / 16;
remainder = length % 16;
for ( i = 0; i < lines ; i ++ ) {
int cur;
for ( cur = 0; cur < 8; cur ++ ) {
byte a, b;
a = *(buf ++ );
b = *(buf ++ );
printk("%02x%02x ", a, b );
}
printk("\n");
}
for ( i = 0; i < remainder/2 ; i++ ) {
byte a, b;
a = *(buf ++ );
b = *(buf ++ );
printk("%02x%02x ", a, b );
}
printk("\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. */
printk(KERN_WARNING 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 = dev_alloc_skb( packet_length + 5);
if ( skb == NULL ) {
printk(KERN_NOTICE CARDNAME ": Low memory, packet dropped.\n");
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 ) {
printk(KERN_DEBUG 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 ) {
printk(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);
if (IS_ERR(devSMC9194))
return PTR_ERR(devSMC9194);
return 0;
}
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 */
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