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linux/drivers/net/at1700.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

932 lines
25 KiB
C
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/* at1700.c: A network device driver for the Allied Telesis AT1700.
Written 1993-98 by Donald Becker.
Copyright 1993 United States Government as represented by the
Director, National Security Agency.
This software may be used and distributed according to the terms
of the GNU General Public License, incorporated herein by reference.
The author may be reached as becker@scyld.com, or C/O
Scyld Computing Corporation
410 Severn Ave., Suite 210
Annapolis MD 21403
This is a device driver for the Allied Telesis AT1700, and
Fujitsu FMV-181/182/181A/182A/183/184/183A/184A, which are
straight-forward Fujitsu MB86965 implementations.
Modification for Fujitsu FMV-18X cards is done by Yutaka Tamiya
(tamy@flab.fujitsu.co.jp).
Sources:
The Fujitsu MB86965 datasheet.
After the initial version of this driver was written Gerry Sawkins of
ATI provided their EEPROM configuration code header file.
Thanks to NIIBE Yutaka <gniibe@mri.co.jp> for bug fixes.
MCA bus (AT1720) support by Rene Schmit <rene@bss.lu>
Bugs:
The MB86965 has a design flaw that makes all probes unreliable. Not
only is it difficult to detect, it also moves around in I/O space in
response to inb()s from other device probes!
*/
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mca-legacy.h>
#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/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
static char version[] __initdata =
"at1700.c:v1.16 9/11/06 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
#define DRV_NAME "at1700"
/* Tunable parameters. */
/* When to switch from the 64-entry multicast filter to Rx-all-multicast. */
#define MC_FILTERBREAK 64
/* These unusual address orders are used to verify the CONFIG register. */
static int fmv18x_probe_list[] __initdata = {
0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x300, 0x340, 0
};
/*
* ISA
*/
static unsigned at1700_probe_list[] __initdata = {
0x260, 0x280, 0x2a0, 0x240, 0x340, 0x320, 0x380, 0x300, 0
};
/*
* MCA
*/
#ifdef CONFIG_MCA_LEGACY
static int at1700_ioaddr_pattern[] __initdata = {
0x00, 0x04, 0x01, 0x05, 0x02, 0x06, 0x03, 0x07
};
static int at1700_mca_probe_list[] __initdata = {
0x400, 0x1400, 0x2400, 0x3400, 0x4400, 0x5400, 0x6400, 0x7400, 0
};
static int at1700_irq_pattern[] __initdata = {
0x00, 0x00, 0x00, 0x30, 0x70, 0xb0, 0x00, 0x00,
0x00, 0xf0, 0x34, 0x74, 0xb4, 0x00, 0x00, 0xf4, 0x00
};
#endif
/* use 0 for production, 1 for verification, >2 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 1
#endif
static unsigned int net_debug = NET_DEBUG;
typedef unsigned char uchar;
/* Information that need to be kept for each board. */
struct net_local {
struct net_device_stats stats;
spinlock_t lock;
unsigned char mc_filter[8];
uint jumpered:1; /* Set iff the board has jumper config. */
uint tx_started:1; /* Packets are on the Tx queue. */
uint tx_queue_ready:1; /* Tx queue is ready to be sent. */
uint rx_started:1; /* Packets are Rxing. */
uchar tx_queue; /* Number of packet on the Tx queue. */
char mca_slot; /* -1 means ISA */
ushort tx_queue_len; /* Current length of the Tx queue. */
};
/* Offsets from the base address. */
#define STATUS 0
#define TX_STATUS 0
#define RX_STATUS 1
#define TX_INTR 2 /* Bit-mapped interrupt enable registers. */
#define RX_INTR 3
#define TX_MODE 4
#define RX_MODE 5
#define CONFIG_0 6 /* Misc. configuration settings. */
#define CONFIG_1 7
/* Run-time register bank 2 definitions. */
#define DATAPORT 8 /* Word-wide DMA or programmed-I/O dataport. */
#define TX_START 10
#define COL16CNTL 11 /* Controll Reg for 16 collisions */
#define MODE13 13
#define RX_CTRL 14
/* Configuration registers only on the '865A/B chips. */
#define EEPROM_Ctrl 16
#define EEPROM_Data 17
#define CARDSTATUS 16 /* FMV-18x Card Status */
#define CARDSTATUS1 17 /* FMV-18x Card Status */
#define IOCONFIG 18 /* Either read the jumper, or move the I/O. */
#define IOCONFIG1 19
#define SAPROM 20 /* The station address PROM, if no EEPROM. */
#define MODE24 24
#define RESET 31 /* Write to reset some parts of the chip. */
#define AT1700_IO_EXTENT 32
#define PORT_OFFSET(o) (o)
#define TX_TIMEOUT 10
/* Index to functions, as function prototypes. */
static int at1700_probe1(struct net_device *dev, int ioaddr);
static int read_eeprom(long ioaddr, int location);
static int net_open(struct net_device *dev);
static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t net_interrupt(int irq, void *dev_id);
static void net_rx(struct net_device *dev);
static int net_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);
static void set_rx_mode(struct net_device *dev);
static void net_tx_timeout (struct net_device *dev);
#ifdef CONFIG_MCA_LEGACY
struct at1720_mca_adapters_struct {
char* name;
int id;
};
/* rEnE : maybe there are others I don't know off... */
static struct at1720_mca_adapters_struct at1720_mca_adapters[] __initdata = {
{ "Allied Telesys AT1720AT", 0x6410 },
{ "Allied Telesys AT1720BT", 0x6413 },
{ "Allied Telesys AT1720T", 0x6416 },
{ NULL, 0 },
};
#endif
/* Check for a network adaptor of this type, and return '0' iff one exists.
If dev->base_addr == 0, probe all likely locations.
If dev->base_addr == 1, always return failure.
If dev->base_addr == 2, allocate space for the device and return success
(detachable devices only).
*/
static int io = 0x260;
static int irq;
static void cleanup_card(struct net_device *dev)
{
#ifdef CONFIG_MCA_LEGACY
struct net_local *lp = netdev_priv(dev);
if (lp->mca_slot >= 0)
mca_mark_as_unused(lp->mca_slot);
#endif
free_irq(dev->irq, NULL);
release_region(dev->base_addr, AT1700_IO_EXTENT);
}
struct net_device * __init at1700_probe(int unit)
{
struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
unsigned *port;
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;
} else {
dev->base_addr = io;
dev->irq = irq;
}
SET_MODULE_OWNER(dev);
if (io > 0x1ff) { /* Check a single specified location. */
err = at1700_probe1(dev, io);
} else if (io != 0) { /* Don't probe at all. */
err = -ENXIO;
} else {
for (port = at1700_probe_list; *port; port++) {
if (at1700_probe1(dev, *port) == 0)
break;
dev->irq = irq;
}
if (!*port)
err = -ENODEV;
}
if (err)
goto out;
err = register_netdev(dev);
if (err)
goto out1;
return dev;
out1:
cleanup_card(dev);
out:
free_netdev(dev);
return ERR_PTR(err);
}
/* The Fujitsu datasheet suggests that the NIC be probed for by checking its
"signature", the default bit pattern after a reset. This *doesn't* work --
there is no way to reset the bus interface without a complete power-cycle!
It turns out that ATI came to the same conclusion I did: the only thing
that can be done is checking a few bits and then diving right into an
EEPROM read. */
static int __init at1700_probe1(struct net_device *dev, int ioaddr)
{
char fmv_irqmap[4] = {3, 7, 10, 15};
char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
int slot, ret = -ENODEV;
struct net_local *lp = netdev_priv(dev);
if (!request_region(ioaddr, AT1700_IO_EXTENT, DRV_NAME))
return -EBUSY;
/* Resetting the chip doesn't reset the ISA interface, so don't bother.
That means we have to be careful with the register values we probe
for.
*/
#ifdef notdef
printk("at1700 probe at %#x, eeprom is %4.4x %4.4x %4.4x ctrl %4.4x.\n",
ioaddr, read_eeprom(ioaddr, 4), read_eeprom(ioaddr, 5),
read_eeprom(ioaddr, 6), inw(ioaddr + EEPROM_Ctrl));
#endif
#ifdef CONFIG_MCA_LEGACY
/* rEnE (rene@bss.lu): got this from 3c509 driver source , adapted for AT1720 */
/* Based on Erik Nygren's (nygren@mit.edu) 3c529 patch, heavily
modified by Chris Beauregard (cpbeaure@csclub.uwaterloo.ca)
to support standard MCA probing. */
/* redone for multi-card detection by ZP Gu (zpg@castle.net) */
/* now works as a module */
if (MCA_bus) {
int j;
int l_i;
u_char pos3, pos4;
for (j = 0; at1720_mca_adapters[j].name != NULL; j ++) {
slot = 0;
while (slot != MCA_NOTFOUND) {
slot = mca_find_unused_adapter( at1720_mca_adapters[j].id, slot );
if (slot == MCA_NOTFOUND) break;
/* if we get this far, an adapter has been detected and is
enabled */
pos3 = mca_read_stored_pos( slot, 3 );
pos4 = mca_read_stored_pos( slot, 4 );
for (l_i = 0; l_i < 0x09; l_i++)
if (( pos3 & 0x07) == at1700_ioaddr_pattern[l_i])
break;
ioaddr = at1700_mca_probe_list[l_i];
for (irq = 0; irq < 0x10; irq++)
if (((((pos4>>4) & 0x0f) | (pos3 & 0xf0)) & 0xff) == at1700_irq_pattern[irq])
break;
/* probing for a card at a particular IO/IRQ */
if ((dev->irq && dev->irq != irq) ||
(dev->base_addr && dev->base_addr != ioaddr)) {
slot++; /* probing next slot */
continue;
}
dev->irq = irq;
/* claim the slot */
mca_set_adapter_name( slot, at1720_mca_adapters[j].name );
mca_mark_as_used(slot);
goto found;
}
}
/* if we get here, we didn't find an MCA adapter - try ISA */
}
#endif
slot = -1;
/* We must check for the EEPROM-config boards first, else accessing
IOCONFIG0 will move the board! */
if (at1700_probe_list[inb(ioaddr + IOCONFIG1) & 0x07] == ioaddr
&& read_eeprom(ioaddr, 4) == 0x0000
&& (read_eeprom(ioaddr, 5) & 0xff00) == 0xF400)
is_at1700 = 1;
else if (inb(ioaddr + SAPROM ) == 0x00
&& inb(ioaddr + SAPROM + 1) == 0x00
&& inb(ioaddr + SAPROM + 2) == 0x0e)
is_fmv18x = 1;
else {
goto err_out;
}
#ifdef CONFIG_MCA_LEGACY
found:
#endif
/* Reset the internal state machines. */
outb(0, ioaddr + RESET);
if (is_at1700) {
irq = at1700_irqmap[(read_eeprom(ioaddr, 12)&0x04)
| (read_eeprom(ioaddr, 0)>>14)];
} else {
/* Check PnP mode for FMV-183/184/183A/184A. */
/* This PnP routine is very poor. IO and IRQ should be known. */
if (inb(ioaddr + CARDSTATUS1) & 0x20) {
irq = dev->irq;
for (i = 0; i < 8; i++) {
if (irq == fmv_irqmap_pnp[i])
break;
}
if (i == 8) {
goto err_mca;
}
} else {
if (fmv18x_probe_list[inb(ioaddr + IOCONFIG) & 0x07] != ioaddr)
goto err_mca;
irq = fmv_irqmap[(inb(ioaddr + IOCONFIG)>>6) & 0x03];
}
}
printk("%s: %s found at %#3x, IRQ %d, address ", dev->name,
is_at1700 ? "AT1700" : "FMV-18X", ioaddr, irq);
dev->base_addr = ioaddr;
dev->irq = irq;
if (is_at1700) {
for(i = 0; i < 3; i++) {
unsigned short eeprom_val = read_eeprom(ioaddr, 4+i);
printk("%04x", eeprom_val);
((unsigned short *)dev->dev_addr)[i] = ntohs(eeprom_val);
}
} else {
for(i = 0; i < 6; i++) {
unsigned char val = inb(ioaddr + SAPROM + i);
printk("%02x", val);
dev->dev_addr[i] = val;
}
}
/* The EEPROM word 12 bit 0x0400 means use regular 100 ohm 10baseT signals,
rather than 150 ohm shielded twisted pair compensation.
0x0000 == auto-sense the interface
0x0800 == use TP interface
0x1800 == use coax interface
*/
{
const char *porttype[] = {"auto-sense", "10baseT", "auto-sense", "10base2"};
if (is_at1700) {
ushort setup_value = read_eeprom(ioaddr, 12);
dev->if_port = setup_value >> 8;
} else {
ushort setup_value = inb(ioaddr + CARDSTATUS);
switch (setup_value & 0x07) {
case 0x01: /* 10base5 */
case 0x02: /* 10base2 */
dev->if_port = 0x18; break;
case 0x04: /* 10baseT */
dev->if_port = 0x08; break;
default: /* auto-sense */
dev->if_port = 0x00; break;
}
}
printk(" %s interface.\n", porttype[(dev->if_port>>3) & 3]);
}
/* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
bus access, two 4K Tx queues, and disabled Tx and Rx. */
outb(0xda, ioaddr + CONFIG_0);
/* Set the station address in bank zero. */
outb(0x00, ioaddr + CONFIG_1);
for (i = 0; i < 6; i++)
outb(dev->dev_addr[i], ioaddr + PORT_OFFSET(8 + i));
/* Switch to bank 1 and set the multicast table to accept none. */
outb(0x04, ioaddr + CONFIG_1);
for (i = 0; i < 8; i++)
outb(0x00, ioaddr + PORT_OFFSET(8 + i));
/* Switch to bank 2 */
/* Lock our I/O address, and set manual processing mode for 16 collisions. */
outb(0x08, ioaddr + CONFIG_1);
outb(dev->if_port, ioaddr + MODE13);
outb(0x00, ioaddr + COL16CNTL);
if (net_debug)
printk(version);
memset(lp, 0, sizeof(struct net_local));
dev->open = net_open;
dev->stop = net_close;
dev->hard_start_xmit = net_send_packet;
dev->get_stats = net_get_stats;
dev->set_multicast_list = &set_rx_mode;
dev->tx_timeout = net_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
spin_lock_init(&lp->lock);
lp->jumpered = is_fmv18x;
lp->mca_slot = slot;
/* Snarf the interrupt vector now. */
ret = request_irq(irq, &net_interrupt, 0, DRV_NAME, dev);
if (ret) {
printk (" AT1700 at %#3x is unusable due to a conflict on"
"IRQ %d.\n", ioaddr, irq);
goto err_mca;
}
return 0;
err_mca:
#ifdef CONFIG_MCA_LEGACY
if (slot >= 0)
mca_mark_as_unused(slot);
#endif
err_out:
release_region(ioaddr, AT1700_IO_EXTENT);
return ret;
}
/* EEPROM_Ctrl bits. */
#define EE_SHIFT_CLK 0x40 /* EEPROM shift clock, in reg. 16. */
#define EE_CS 0x20 /* EEPROM chip select, in reg. 16. */
#define EE_DATA_WRITE 0x80 /* EEPROM chip data in, in reg. 17. */
#define EE_DATA_READ 0x80 /* EEPROM chip data out, in reg. 17. */
/* The EEPROM commands include the alway-set leading bit. */
#define EE_WRITE_CMD (5 << 6)
#define EE_READ_CMD (6 << 6)
#define EE_ERASE_CMD (7 << 6)
static int __init read_eeprom(long ioaddr, int location)
{
int i;
unsigned short retval = 0;
long ee_addr = ioaddr + EEPROM_Ctrl;
long ee_daddr = ioaddr + EEPROM_Data;
int read_cmd = location | EE_READ_CMD;
/* Shift the read command bits out. */
for (i = 9; i >= 0; i--) {
short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
outb(EE_CS, ee_addr);
outb(dataval, ee_daddr);
outb(EE_CS | EE_SHIFT_CLK, ee_addr); /* EEPROM clock tick. */
}
outb(EE_DATA_WRITE, ee_daddr);
for (i = 16; i > 0; i--) {
outb(EE_CS, ee_addr);
outb(EE_CS | EE_SHIFT_CLK, ee_addr);
retval = (retval << 1) | ((inb(ee_daddr) & EE_DATA_READ) ? 1 : 0);
}
/* Terminate the EEPROM access. */
outb(EE_CS, ee_addr);
outb(EE_SHIFT_CLK, ee_addr);
outb(0, ee_addr);
return retval;
}
static int net_open(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
/* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
bus access, and two 4K Tx queues. */
outb(0x5a, ioaddr + CONFIG_0);
/* Powerup, switch to register bank 2, and enable the Rx and Tx. */
outb(0xe8, ioaddr + CONFIG_1);
lp->tx_started = 0;
lp->tx_queue_ready = 1;
lp->rx_started = 0;
lp->tx_queue = 0;
lp->tx_queue_len = 0;
/* Turn on hardware Tx and Rx interrupts. */
outb(0x82, ioaddr + TX_INTR);
outb(0x81, ioaddr + RX_INTR);
/* Enable the IRQ on boards of fmv18x it is feasible. */
if (lp->jumpered) {
outb(0x80, ioaddr + IOCONFIG1);
}
netif_start_queue(dev);
return 0;
}
static void net_tx_timeout (struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
printk ("%s: transmit timed out with status %04x, %s?\n", dev->name,
inw (ioaddr + STATUS), inb (ioaddr + TX_STATUS) & 0x80
? "IRQ conflict" : "network cable problem");
printk ("%s: timeout registers: %04x %04x %04x %04x %04x %04x %04x %04x.\n",
dev->name, inw(ioaddr + TX_STATUS), inw(ioaddr + TX_INTR), inw(ioaddr + TX_MODE),
inw(ioaddr + CONFIG_0), inw(ioaddr + DATAPORT), inw(ioaddr + TX_START),
inw(ioaddr + MODE13 - 1), inw(ioaddr + RX_CTRL));
lp->stats.tx_errors++;
/* ToDo: We should try to restart the adaptor... */
outw(0xffff, ioaddr + MODE24);
outw (0xffff, ioaddr + TX_STATUS);
outb (0x5a, ioaddr + CONFIG_0);
outb (0xe8, ioaddr + CONFIG_1);
outw (0x8182, ioaddr + TX_INTR);
outb (0x00, ioaddr + TX_START);
outb (0x03, ioaddr + COL16CNTL);
dev->trans_start = jiffies;
lp->tx_started = 0;
lp->tx_queue_ready = 1;
lp->rx_started = 0;
lp->tx_queue = 0;
lp->tx_queue_len = 0;
netif_wake_queue(dev);
}
static int net_send_packet (struct sk_buff *skb, struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
short len = skb->len;
unsigned char *buf = skb->data;
static u8 pad[ETH_ZLEN];
netif_stop_queue (dev);
/* We may not start transmitting unless we finish transferring
a packet into the Tx queue. During executing the following
codes we possibly catch a Tx interrupt. Thus we flag off
tx_queue_ready, so that we prevent the interrupt routine
(net_interrupt) to start transmitting. */
lp->tx_queue_ready = 0;
{
outw (length, ioaddr + DATAPORT);
/* Packet data */
outsw (ioaddr + DATAPORT, buf, len >> 1);
/* Check for dribble byte */
if (len & 1) {
outw(skb->data[skb->len-1], ioaddr + DATAPORT);
len++;
}
/* Check for packet padding */
if (length != skb->len)
outsw(ioaddr + DATAPORT, pad, (length - len + 1) >> 1);
lp->tx_queue++;
lp->tx_queue_len += length + 2;
}
lp->tx_queue_ready = 1;
if (lp->tx_started == 0) {
/* If the Tx is idle, always trigger a transmit. */
outb (0x80 | lp->tx_queue, ioaddr + TX_START);
lp->tx_queue = 0;
lp->tx_queue_len = 0;
dev->trans_start = jiffies;
lp->tx_started = 1;
netif_start_queue (dev);
} else if (lp->tx_queue_len < 4096 - 1502)
/* Yes, there is room for one more packet. */
netif_start_queue (dev);
dev_kfree_skb (skb);
return 0;
}
/* The typical workload of the driver:
Handle the network interface interrupts. */
static irqreturn_t net_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct net_local *lp;
int ioaddr, status;
int handled = 0;
if (dev == NULL) {
printk ("at1700_interrupt(): irq %d for unknown device.\n", irq);
return IRQ_NONE;
}
ioaddr = dev->base_addr;
lp = netdev_priv(dev);
spin_lock (&lp->lock);
status = inw(ioaddr + TX_STATUS);
outw(status, ioaddr + TX_STATUS);
if (net_debug > 4)
printk("%s: Interrupt with status %04x.\n", dev->name, status);
if (lp->rx_started == 0 &&
(status & 0xff00 || (inb(ioaddr + RX_MODE) & 0x40) == 0)) {
/* Got a packet(s).
We cannot execute net_rx more than once at the same time for
the same device. During executing net_rx, we possibly catch a
Tx interrupt. Thus we flag on rx_started, so that we prevent
the interrupt routine (net_interrupt) to dive into net_rx
again. */
handled = 1;
lp->rx_started = 1;
outb(0x00, ioaddr + RX_INTR); /* Disable RX intr. */
net_rx(dev);
outb(0x81, ioaddr + RX_INTR); /* Enable RX intr. */
lp->rx_started = 0;
}
if (status & 0x00ff) {
handled = 1;
if (status & 0x02) {
/* More than 16 collisions occurred */
if (net_debug > 4)
printk("%s: 16 Collision occur during Txing.\n", dev->name);
/* Cancel sending a packet. */
outb(0x03, ioaddr + COL16CNTL);
lp->stats.collisions++;
}
if (status & 0x82) {
lp->stats.tx_packets++;
/* The Tx queue has any packets and is not being
transferred a packet from the host, start
transmitting. */
if (lp->tx_queue && lp->tx_queue_ready) {
outb(0x80 | lp->tx_queue, ioaddr + TX_START);
lp->tx_queue = 0;
lp->tx_queue_len = 0;
dev->trans_start = jiffies;
netif_wake_queue (dev);
} else {
lp->tx_started = 0;
netif_wake_queue (dev);
}
}
}
spin_unlock (&lp->lock);
return IRQ_RETVAL(handled);
}
/* We have a good packet(s), get it/them out of the buffers. */
static void
net_rx(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
int boguscount = 5;
while ((inb(ioaddr + RX_MODE) & 0x40) == 0) {
ushort status = inw(ioaddr + DATAPORT);
ushort pkt_len = inw(ioaddr + DATAPORT);
if (net_debug > 4)
printk("%s: Rxing packet mode %02x status %04x.\n",
dev->name, inb(ioaddr + RX_MODE), status);
#ifndef final_version
if (status == 0) {
outb(0x05, ioaddr + RX_CTRL);
break;
}
#endif
if ((status & 0xF0) != 0x20) { /* There was an error. */
lp->stats.rx_errors++;
if (status & 0x08) lp->stats.rx_length_errors++;
if (status & 0x04) lp->stats.rx_frame_errors++;
if (status & 0x02) lp->stats.rx_crc_errors++;
if (status & 0x01) lp->stats.rx_over_errors++;
} else {
/* Malloc up new buffer. */
struct sk_buff *skb;
if (pkt_len > 1550) {
printk("%s: The AT1700 claimed a very large packet, size %d.\n",
dev->name, pkt_len);
/* Prime the FIFO and then flush the packet. */
inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
outb(0x05, ioaddr + RX_CTRL);
lp->stats.rx_errors++;
break;
}
skb = dev_alloc_skb(pkt_len+3);
if (skb == NULL) {
printk("%s: Memory squeeze, dropping packet (len %d).\n",
dev->name, pkt_len);
/* Prime the FIFO and then flush the packet. */
inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
outb(0x05, ioaddr + RX_CTRL);
lp->stats.rx_dropped++;
break;
}
skb->dev = dev;
skb_reserve(skb,2);
insw(ioaddr + DATAPORT, skb_put(skb,pkt_len), (pkt_len + 1) >> 1);
skb->protocol=eth_type_trans(skb, dev);
netif_rx(skb);
dev->last_rx = jiffies;
lp->stats.rx_packets++;
lp->stats.rx_bytes += pkt_len;
}
if (--boguscount <= 0)
break;
}
/* If any worth-while packets have been received, dev_rint()
has done a mark_bh(NET_BH) for us and will work on them
when we get to the bottom-half routine. */
{
int i;
for (i = 0; i < 20; i++) {
if ((inb(ioaddr + RX_MODE) & 0x40) == 0x40)
break;
inw(ioaddr + DATAPORT); /* dummy status read */
outb(0x05, ioaddr + RX_CTRL);
}
if (net_debug > 5)
printk("%s: Exint Rx packet with mode %02x after %d ticks.\n",
dev->name, inb(ioaddr + RX_MODE), i);
}
return;
}
/* The inverse routine to net_open(). */
static int net_close(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
int ioaddr = dev->base_addr;
netif_stop_queue(dev);
/* Set configuration register 0 to disable Tx and Rx. */
outb(0xda, ioaddr + CONFIG_0);
/* No statistic counters on the chip to update. */
/* Disable the IRQ on boards of fmv18x where it is feasible. */
if (lp->jumpered) {
outb(0x00, ioaddr + IOCONFIG1);
free_irq(dev->irq, dev);
}
/* Power-down the chip. Green, green, green! */
outb(0x00, ioaddr + CONFIG_1);
return 0;
}
/* Get the current statistics.
This may be called with the card open or closed.
There are no on-chip counters, so this function is trivial.
*/
static struct net_device_stats *
net_get_stats(struct net_device *dev)
{
struct net_local *lp = netdev_priv(dev);
return &lp->stats;
}
/*
Set the multicast/promiscuous mode for this adaptor.
*/
static void
set_rx_mode(struct net_device *dev)
{
int ioaddr = dev->base_addr;
struct net_local *lp = netdev_priv(dev);
unsigned char mc_filter[8]; /* Multicast hash filter */
unsigned long flags;
int i;
if (dev->flags & IFF_PROMISC) {
memset(mc_filter, 0xff, sizeof(mc_filter));
outb(3, ioaddr + RX_MODE); /* Enable promiscuous mode */
} else if (dev->mc_count > MC_FILTERBREAK
|| (dev->flags & IFF_ALLMULTI)) {
/* Too many to filter perfectly -- accept all multicasts. */
memset(mc_filter, 0xff, sizeof(mc_filter));
outb(2, ioaddr + RX_MODE); /* Use normal mode. */
} else if (dev->mc_count == 0) {
memset(mc_filter, 0x00, sizeof(mc_filter));
outb(1, ioaddr + RX_MODE); /* Ignore almost all multicasts. */
} else {
struct dev_mc_list *mclist;
int i;
memset(mc_filter, 0, sizeof(mc_filter));
for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
i++, mclist = mclist->next) {
unsigned int bit =
ether_crc_le(ETH_ALEN, mclist->dmi_addr) >> 26;
mc_filter[bit >> 3] |= (1 << bit);
}
outb(0x02, ioaddr + RX_MODE); /* Use normal mode. */
}
spin_lock_irqsave (&lp->lock, flags);
if (memcmp(mc_filter, lp->mc_filter, sizeof(mc_filter))) {
int saved_bank = inw(ioaddr + CONFIG_0);
/* Switch to bank 1 and set the multicast table. */
outw((saved_bank & ~0x0C00) | 0x0480, ioaddr + CONFIG_0);
for (i = 0; i < 8; i++)
outb(mc_filter[i], ioaddr + PORT_OFFSET(8 + i));
memcpy(lp->mc_filter, mc_filter, sizeof(mc_filter));
outw(saved_bank, ioaddr + CONFIG_0);
}
spin_unlock_irqrestore (&lp->lock, flags);
return;
}
#ifdef MODULE
static struct net_device *dev_at1700;
module_param(io, int, 0);
module_param(irq, int, 0);
module_param(net_debug, int, 0);
MODULE_PARM_DESC(io, "AT1700/FMV18X I/O base address");
MODULE_PARM_DESC(irq, "AT1700/FMV18X IRQ number");
MODULE_PARM_DESC(net_debug, "AT1700/FMV18X debug level (0-6)");
int __init init_module(void)
{
if (io == 0)
printk("at1700: You should not use auto-probing with insmod!\n");
dev_at1700 = at1700_probe(-1);
if (IS_ERR(dev_at1700))
return PTR_ERR(dev_at1700);
return 0;
}
void
cleanup_module(void)
{
unregister_netdev(dev_at1700);
cleanup_card(dev_at1700);
free_netdev(dev_at1700);
}
#endif /* MODULE */
MODULE_LICENSE("GPL");
/*
* Local variables:
* compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
* alt-compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
* tab-width: 4
* c-basic-offset: 4
* c-indent-level: 4
* End:
*/
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