q3k/linux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
linux/drivers/net/ariadne.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

875 lines
24 KiB
C
Raw Blame History

/*
* Amiga Linux/m68k Ariadne Ethernet Driver
*
* © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
* Peter De Schrijver (p2@mind.be)
*
* ---------------------------------------------------------------------------
*
* This program is based on
*
* lance.c: An AMD LANCE ethernet driver for linux.
* Written 1993-94 by Donald Becker.
*
* Am79C960: PCnet(tm)-ISA Single-Chip Ethernet Controller
* Advanced Micro Devices
* Publication #16907, Rev. B, Amendment/0, May 1994
*
* MC68230: Parallel Interface/Timer (PI/T)
* Motorola Semiconductors, December, 1983
*
* ---------------------------------------------------------------------------
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of the Linux
* distribution for more details.
*
* ---------------------------------------------------------------------------
*
* The Ariadne is a Zorro-II board made by Village Tronic. It contains:
*
* - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
* 10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
*
* - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
*/
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/zorro.h>
#include <linux/bitops.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>
#include "ariadne.h"
#ifdef ARIADNE_DEBUG
int ariadne_debug = ARIADNE_DEBUG;
#else
int ariadne_debug = 1;
#endif
/*
* Macros to Fix Endianness problems
*/
/* Swap the Bytes in a WORD */
#define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00))
/* Get the Low BYTE in a WORD */
#define lowb(x) (x&0xff)
/* Get the Swapped High WORD in a LONG */
#define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
/* Get the Swapped Low WORD in a LONG */
#define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
/*
* Transmit/Receive Ring Definitions
*/
#define TX_RING_SIZE 5
#define RX_RING_SIZE 16
#define PKT_BUF_SIZE 1520
/*
* Private Device Data
*/
struct ariadne_private {
volatile struct TDRE *tx_ring[TX_RING_SIZE];
volatile struct RDRE *rx_ring[RX_RING_SIZE];
volatile u_short *tx_buff[TX_RING_SIZE];
volatile u_short *rx_buff[RX_RING_SIZE];
int cur_tx, cur_rx; /* The next free ring entry */
int dirty_tx; /* The ring entries to be free()ed. */
struct net_device_stats stats;
char tx_full;
};
/*
* Structure Created in the Ariadne's RAM Buffer
*/
struct lancedata {
struct TDRE tx_ring[TX_RING_SIZE];
struct RDRE rx_ring[RX_RING_SIZE];
u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
};
static int ariadne_open(struct net_device *dev);
static void ariadne_init_ring(struct net_device *dev);
static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
static void ariadne_tx_timeout(struct net_device *dev);
static int ariadne_rx(struct net_device *dev);
static void ariadne_reset(struct net_device *dev);
static irqreturn_t ariadne_interrupt(int irq, void *data);
static int ariadne_close(struct net_device *dev);
static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
#ifdef HAVE_MULTICAST
static void set_multicast_list(struct net_device *dev);
#endif
static void memcpyw(volatile u_short *dest, u_short *src, int len)
{
while (len >= 2) {
*(dest++) = *(src++);
len -= 2;
}
if (len == 1)
*dest = (*(u_char *)src)<<8;
}
static int __devinit ariadne_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent);
static void __devexit ariadne_remove_one(struct zorro_dev *z);
static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
{ 0 }
};
static struct zorro_driver ariadne_driver = {
.name = "ariadne",
.id_table = ariadne_zorro_tbl,
.probe = ariadne_init_one,
.remove = __devexit_p(ariadne_remove_one),
};
static int __devinit ariadne_init_one(struct zorro_dev *z,
const struct zorro_device_id *ent)
{
unsigned long board = z->resource.start;
unsigned long base_addr = board+ARIADNE_LANCE;
unsigned long mem_start = board+ARIADNE_RAM;
struct resource *r1, *r2;
struct net_device *dev;
struct ariadne_private *priv;
int err;
r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
if (!r1)
return -EBUSY;
r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
if (!r2) {
release_resource(r1);
return -EBUSY;
}
dev = alloc_etherdev(sizeof(struct ariadne_private));
if (dev == NULL) {
release_resource(r1);
release_resource(r2);
return -ENOMEM;
}
SET_MODULE_OWNER(dev);
priv = netdev_priv(dev);
r1->name = dev->name;
r2->name = dev->name;
dev->dev_addr[0] = 0x00;
dev->dev_addr[1] = 0x60;
dev->dev_addr[2] = 0x30;
dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
dev->base_addr = ZTWO_VADDR(base_addr);
dev->mem_start = ZTWO_VADDR(mem_start);
dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
dev->open = &ariadne_open;
dev->stop = &ariadne_close;
dev->hard_start_xmit = &ariadne_start_xmit;
dev->tx_timeout = &ariadne_tx_timeout;
dev->watchdog_timeo = 5*HZ;
dev->get_stats = &ariadne_get_stats;
dev->set_multicast_list = &set_multicast_list;
err = register_netdev(dev);
if (err) {
release_resource(r1);
release_resource(r2);
free_netdev(dev);
return err;
}
zorro_set_drvdata(z, dev);
printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
"%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
return 0;
}
static int ariadne_open(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
u_short in;
u_long version;
int i;
/* Reset the LANCE */
in = lance->Reset;
/* Stop the LANCE */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP;
/* Check the LANCE version */
lance->RAP = CSR88; /* Chip ID */
version = swapw(lance->RDP);
lance->RAP = CSR89; /* Chip ID */
version |= swapw(lance->RDP)<<16;
if ((version & 0x00000fff) != 0x00000003) {
printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
return -EAGAIN;
}
if ((version & 0x0ffff000) != 0x00003000) {
printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
"number = %ld)\n", (version & 0x0ffff000)>>12);
return -EAGAIN;
}
#if 0
printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
(version & 0xf0000000)>>28);
#endif
ariadne_init_ring(dev);
/* Miscellaneous Stuff */
lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */
lance->RDP = 0x0000;
lance->RAP = CSR4; /* Test and Features Control */
lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
/* Set the Multicast Table */
lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */
lance->RDP = 0x0000;
lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */
lance->RDP = 0x0000;
lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */
lance->RDP = 0x0000;
lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */
lance->RDP = 0x0000;
/* Set the Ethernet Hardware Address */
lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */
lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
/* Set the Init Block Mode */
lance->RAP = CSR15; /* Mode Register */
lance->RDP = 0x0000;
/* Set the Transmit Descriptor Ring Pointer */
lance->RAP = CSR30; /* Base Address of Transmit Ring */
lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
lance->RAP = CSR31; /* Base Address of transmit Ring */
lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
/* Set the Receive Descriptor Ring Pointer */
lance->RAP = CSR24; /* Base Address of Receive Ring */
lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
lance->RAP = CSR25; /* Base Address of Receive Ring */
lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
/* Set the Number of RX and TX Ring Entries */
lance->RAP = CSR76; /* Receive Ring Length */
lance->RDP = swapw(((u_short)-RX_RING_SIZE));
lance->RAP = CSR78; /* Transmit Ring Length */
lance->RDP = swapw(((u_short)-TX_RING_SIZE));
/* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
lance->RAP = ISACSR2; /* Miscellaneous Configuration */
lance->IDP = ASEL;
/* LED Control */
lance->RAP = ISACSR5; /* LED1 Status */
lance->IDP = PSE|XMTE;
lance->RAP = ISACSR6; /* LED2 Status */
lance->IDP = PSE|COLE;
lance->RAP = ISACSR7; /* LED3 Status */
lance->IDP = PSE|RCVE;
netif_start_queue(dev);
i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
dev->name, dev);
if (i) return i;
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|STRT;
return 0;
}
static void ariadne_init_ring(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
int i;
netif_stop_queue(dev);
priv->tx_full = 0;
priv->cur_rx = priv->cur_tx = 0;
priv->dirty_tx = 0;
/* Set up TX Ring */
for (i = 0; i < TX_RING_SIZE; i++) {
volatile struct TDRE *t = &lancedata->tx_ring[i];
t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
TF_STP | TF_ENP;
t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
t->TMD3 = 0;
priv->tx_ring[i] = &lancedata->tx_ring[i];
priv->tx_buff[i] = lancedata->tx_buff[i];
#if 0
printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
&lancedata->tx_ring[i], lancedata->tx_buff[i]);
#endif
}
/* Set up RX Ring */
for (i = 0; i < RX_RING_SIZE; i++) {
volatile struct RDRE *r = &lancedata->rx_ring[i];
r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
RF_OWN;
r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
r->RMD3 = 0x0000;
priv->rx_ring[i] = &lancedata->rx_ring[i];
priv->rx_buff[i] = lancedata->rx_buff[i];
#if 0
printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
&lancedata->rx_ring[i], lancedata->rx_buff[i]);
#endif
}
}
static int ariadne_close(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
netif_stop_queue(dev);
lance->RAP = CSR112; /* Missed Frame Count */
priv->stats.rx_missed_errors = swapw(lance->RDP);
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
if (ariadne_debug > 1) {
printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
dev->name, lance->RDP);
printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
priv->stats.rx_missed_errors);
}
/* We stop the LANCE here -- it occasionally polls memory if we don't. */
lance->RDP = STOP;
free_irq(IRQ_AMIGA_PORTS, dev);
return 0;
}
static inline void ariadne_reset(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP;
ariadne_init_ring(dev);
lance->RDP = INEA|STRT;
netif_start_queue(dev);
}
static irqreturn_t ariadne_interrupt(int irq, void *data)
{
struct net_device *dev = (struct net_device *)data;
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
struct ariadne_private *priv;
int csr0, boguscnt;
int handled = 0;
if (dev == NULL) {
printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
return IRQ_NONE;
}
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
if (!(lance->RDP & INTR)) /* Check if any interrupt has been */
return IRQ_NONE; /* generated by the board. */
priv = netdev_priv(dev);
boguscnt = 10;
while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
/* Acknowledge all of the current interrupt sources ASAP. */
lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
#if 0
if (ariadne_debug > 5) {
printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.",
dev->name, csr0, lance->RDP);
printk("[");
if (csr0 & INTR)
printk(" INTR");
if (csr0 & INEA)
printk(" INEA");
if (csr0 & RXON)
printk(" RXON");
if (csr0 & TXON)
printk(" TXON");
if (csr0 & TDMD)
printk(" TDMD");
if (csr0 & STOP)
printk(" STOP");
if (csr0 & STRT)
printk(" STRT");
if (csr0 & INIT)
printk(" INIT");
if (csr0 & ERR)
printk(" ERR");
if (csr0 & BABL)
printk(" BABL");
if (csr0 & CERR)
printk(" CERR");
if (csr0 & MISS)
printk(" MISS");
if (csr0 & MERR)
printk(" MERR");
if (csr0 & RINT)
printk(" RINT");
if (csr0 & TINT)
printk(" TINT");
if (csr0 & IDON)
printk(" IDON");
printk(" ]\n");
}
#endif
if (csr0 & RINT) { /* Rx interrupt */
handled = 1;
ariadne_rx(dev);
}
if (csr0 & TINT) { /* Tx-done interrupt */
int dirty_tx = priv->dirty_tx;
handled = 1;
while (dirty_tx < priv->cur_tx) {
int entry = dirty_tx % TX_RING_SIZE;
int status = lowb(priv->tx_ring[entry]->TMD1);
if (status & TF_OWN)
break; /* It still hasn't been Txed */
priv->tx_ring[entry]->TMD1 &= 0xff00;
if (status & TF_ERR) {
/* There was an major error, log it. */
int err_status = priv->tx_ring[entry]->TMD3;
priv->stats.tx_errors++;
if (err_status & EF_RTRY)
priv->stats.tx_aborted_errors++;
if (err_status & EF_LCAR)
priv->stats.tx_carrier_errors++;
if (err_status & EF_LCOL)
priv->stats.tx_window_errors++;
if (err_status & EF_UFLO) {
/* Ackk! On FIFO errors the Tx unit is turned off! */
priv->stats.tx_fifo_errors++;
/* Remove this verbosity later! */
printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
dev->name, csr0);
/* Restart the chip. */
lance->RDP = STRT;
}
} else {
if (status & (TF_MORE|TF_ONE))
priv->stats.collisions++;
priv->stats.tx_packets++;
}
dirty_tx++;
}
#ifndef final_version
if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
"full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
dirty_tx += TX_RING_SIZE;
}
#endif
if (priv->tx_full && netif_queue_stopped(dev) &&
dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
/* The ring is no longer full. */
priv->tx_full = 0;
netif_wake_queue(dev);
}
priv->dirty_tx = dirty_tx;
}
/* Log misc errors. */
if (csr0 & BABL) {
handled = 1;
priv->stats.tx_errors++; /* Tx babble. */
}
if (csr0 & MISS) {
handled = 1;
priv->stats.rx_errors++; /* Missed a Rx frame. */
}
if (csr0 & MERR) {
handled = 1;
printk(KERN_ERR "%s: Bus master arbitration failure, status "
"%4.4x.\n", dev->name, csr0);
/* Restart the chip. */
lance->RDP = STRT;
}
}
/* Clear any other interrupt, and set interrupt enable. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
#if 0
if (ariadne_debug > 4)
printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
lance->RAP, lance->RDP);
#endif
return IRQ_RETVAL(handled);
}
static void ariadne_tx_timeout(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
dev->name, lance->RDP);
ariadne_reset(dev);
netif_wake_queue(dev);
}
static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
int entry;
unsigned long flags;
int len = skb->len;
#if 0
if (ariadne_debug > 3) {
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
dev->name, lance->RDP);
lance->RDP = 0x0000;
}
#endif
/* FIXME: is the 79C960 new enough to do its own padding right ? */
if (skb->len < ETH_ZLEN)
{
if (skb_padto(skb, ETH_ZLEN))
return 0;
len = ETH_ZLEN;
}
/* Fill in a Tx ring entry */
#if 0
printk(KERN_DEBUG "TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
{
int i;
u_char *ptr = &((u_char *)skb->data)[6];
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" to ");
{
int i;
u_char *ptr = (u_char *)skb->data;
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
#endif
local_irq_save(flags);
entry = priv->cur_tx % TX_RING_SIZE;
/* Caution: the write order is important here, set the base address with
the "ownership" bits last. */
priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
priv->tx_ring[entry]->TMD3 = 0x0000;
memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
#if 0
{
int i, len;
len = skb->len > 64 ? 64 : skb->len;
len >>= 1;
for (i = 0; i < len; i += 8) {
int j;
printk(KERN_DEBUG "%04x:", i);
for (j = 0; (j < 8) && ((i+j) < len); j++) {
if (!(j & 1))
printk(" ");
printk("%04x", priv->tx_buff[entry][i+j]);
}
printk("\n");
}
}
#endif
priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
dev_kfree_skb(skb);
priv->cur_tx++;
if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
#if 0
printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
"dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
#endif
priv->cur_tx -= TX_RING_SIZE;
priv->dirty_tx -= TX_RING_SIZE;
}
/* Trigger an immediate send poll. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|TDMD;
dev->trans_start = jiffies;
if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
netif_stop_queue(dev);
priv->tx_full = 1;
}
local_irq_restore(flags);
return 0;
}
static int ariadne_rx(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
int entry = priv->cur_rx % RX_RING_SIZE;
int i;
/* If we own the next entry, it's a new packet. Send it up. */
while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
int status = lowb(priv->rx_ring[entry]->RMD1);
if (status != (RF_STP|RF_ENP)) { /* There was an error. */
/* There is a tricky error noted by John Murphy,
<murf@perftech.com> to Russ Nelson: Even with full-sized
buffers it's possible for a jabber packet to use two
buffers, with only the last correctly noting the error. */
if (status & RF_ENP)
/* Only count a general error at the end of a packet.*/
priv->stats.rx_errors++;
if (status & RF_FRAM)
priv->stats.rx_frame_errors++;
if (status & RF_OFLO)
priv->stats.rx_over_errors++;
if (status & RF_CRC)
priv->stats.rx_crc_errors++;
if (status & RF_BUFF)
priv->stats.rx_fifo_errors++;
priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
} else {
/* Malloc up new buffer, compatible with net-3. */
short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
struct sk_buff *skb;
skb = dev_alloc_skb(pkt_len+2);
if (skb == NULL) {
printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
dev->name);
for (i = 0; i < RX_RING_SIZE; i++)
if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
break;
if (i > RX_RING_SIZE-2) {
priv->stats.rx_dropped++;
priv->rx_ring[entry]->RMD1 |= RF_OWN;
priv->cur_rx++;
}
break;
}
skb->dev = dev;
skb_reserve(skb,2); /* 16 byte align */
skb_put(skb,pkt_len); /* Make room */
eth_copy_and_sum(skb, (char *)priv->rx_buff[entry], pkt_len,0);
skb->protocol=eth_type_trans(skb,dev);
#if 0
printk(KERN_DEBUG "RX pkt type 0x%04x from ",
((u_short *)skb->data)[6]);
{
int i;
u_char *ptr = &((u_char *)skb->data)[6];
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" to ");
{
int i;
u_char *ptr = (u_char *)skb->data;
for (i = 0; i < 6; i++)
printk("%02x", ptr[i]);
}
printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
#endif
netif_rx(skb);
dev->last_rx = jiffies;
priv->stats.rx_packets++;
priv->stats.rx_bytes += pkt_len;
}
priv->rx_ring[entry]->RMD1 |= RF_OWN;
entry = (++priv->cur_rx) % RX_RING_SIZE;
}
priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
/* We should check that at least two ring entries are free. If not,
we should free one and mark stats->rx_dropped++. */
return 0;
}
static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
{
struct ariadne_private *priv = netdev_priv(dev);
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
short saved_addr;
unsigned long flags;
local_irq_save(flags);
saved_addr = lance->RAP;
lance->RAP = CSR112; /* Missed Frame Count */
priv->stats.rx_missed_errors = swapw(lance->RDP);
lance->RAP = saved_addr;
local_irq_restore(flags);
return &priv->stats;
}
/* Set or clear the multicast filter for this adaptor.
num_addrs == -1 Promiscuous mode, receive all packets
num_addrs == 0 Normal mode, clear multicast list
num_addrs > 0 Multicast mode, receive normal and MC packets, and do
best-effort filtering.
*/
static void set_multicast_list(struct net_device *dev)
{
volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
if (!netif_running(dev))
return;
netif_stop_queue(dev);
/* We take the simple way out and always enable promiscuous mode. */
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = STOP; /* Temporarily stop the lance. */
ariadne_init_ring(dev);
if (dev->flags & IFF_PROMISC) {
lance->RAP = CSR15; /* Mode Register */
lance->RDP = PROM; /* Set promiscuous mode */
} else {
short multicast_table[4];
int num_addrs = dev->mc_count;
int i;
/* We don't use the multicast table, but rely on upper-layer filtering. */
memset(multicast_table, (num_addrs == 0) ? 0 : -1,
sizeof(multicast_table));
for (i = 0; i < 4; i++) {
lance->RAP = CSR8+(i<<8); /* Logical Address Filter */
lance->RDP = swapw(multicast_table[i]);
}
lance->RAP = CSR15; /* Mode Register */
lance->RDP = 0x0000; /* Unset promiscuous mode */
}
lance->RAP = CSR0; /* PCnet-ISA Controller Status */
lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */
netif_wake_queue(dev);
}
static void __devexit ariadne_remove_one(struct zorro_dev *z)
{
struct net_device *dev = zorro_get_drvdata(z);
unregister_netdev(dev);
release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
free_netdev(dev);
}
static int __init ariadne_init_module(void)
{
return zorro_register_driver(&ariadne_driver);
}
static void __exit ariadne_cleanup_module(void)
{
zorro_unregister_driver(&ariadne_driver);
}
module_init(ariadne_init_module);
module_exit(ariadne_cleanup_module);
MODULE_LICENSE("GPL");
Reference in a new issue View git blame Copy permalink