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GNU Mach 1.5
/* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */
/*
* Copyright 1996,97 Thomas Bogendoerfer, 1993-1995,1998 Donald Becker
* Copyright 1993 United States Government as represented by the
* Director, National Security Agency.
*
* Derived from the lance driver written 1993-1995 by Donald Becker.
*
* This software may be used and distributed according to the terms
* of the GNU Public License, incorporated herein by reference.
*
* This driver is for AMD PCnet-PCI based ethercards
*/
static const char *version = "pcnet32.c:v0.99B 4/4/98 DJBecker/TSBogend.\n";
/* A few user-configurable values. */
/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
static int max_interrupt_work = 20;
/*
* Set the number of Tx and Rx buffers, using Log_2(# buffers).
* Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
* That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
*/
#define PCNET_LOG_TX_BUFFERS 4
#define PCNET_LOG_RX_BUFFERS 4
#ifdef MODULE
#ifdef MODVERSIONS
#include <linux/modversions.h>
#endif
#include <linux/module.h>
#include <linux/version.h>
#else
#define MOD_INC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/bios32.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
/* Driver verbosity level. 0 = no messages, 7 = wordy death.
Modify here, or when loading as a module. */
static int pcnet32_debug = 1;
/*
* Theory of Operation
*
* This driver uses the same software structure as the normal lance
* driver. So look for a verbose description in lance.c. The differences
* to the normal lance driver is the use of the 32bit mode of PCnet32
* and PCnetPCI chips. Because these chips are 32bit chips, there is no
* 16MB limitation and we don't need bounce buffers.
*/
/*
* History:
* v0.01: Initial version
* only tested on Alpha Noname Board
* v0.02: changed IRQ handling for new interrupt scheme (dev_id)
* tested on a ASUS SP3G
* v0.10: fixed an odd problem with the 79C794 in a Compaq Deskpro XL
* looks like the 974 doesn't like stopping and restarting in a
* short period of time; now we do a reinit of the lance; the
* bug was triggered by doing ifconfig eth0 <ip> broadcast <addr>
* and hangs the machine (thanks to Klaus Liedl for debugging)
* v0.12: by suggestion from Donald Becker: Renamed driver to pcnet32,
* made it standalone (no need for lance.c)
* v0.13: added additional PCI detecting for special PCI devices (Compaq)
* v0.14: stripped down additional PCI probe (thanks to David C Niemi
* and [email protected] for testing this on their Compaq boxes)
* v0.15: added 79C965 (VLB) probe
* added interrupt sharing for PCI chips
* v0.16: fixed set_multicast_list on Alpha machines
* v0.17: removed hack from dev.c; now pcnet32 uses ethif_probe in Space.c
* v0.19: changed setting of autoselect bit
* v0.20: removed additional Compaq PCI probe; there is now a working one
* in arch/i386/bios32.c
* v0.21: added endian conversion for ppc, from work by [email protected]
* v0.22: added printing of status to ring dump
* v0.23: changed enet_statistics to net_devive_stats
* v0.99: Changes for 2.0.34 final release. -djb
*/
#ifndef __powerpc__
#define le16_to_cpu(val) (val)
#define le32_to_cpu(val) (val)
#endif
#if (LINUX_VERSION_CODE < 0x20123)
//#define test_and_set_bit(val, addr) set_bit(val, addr)
#endif
#define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
#define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12)
#define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4)
#define PKT_BUF_SZ 1544
/* Offsets from base I/O address. */
enum pcnet_offsets { PCNET32_DATA=0x10, PCNET32_ADDR=0x12, PCNET32_RESET=0x14,
PCNET32_BUS_IF=0x16,};
#define PCNET32_TOTAL_SIZE 0x20
/* The PCNET32 Rx and Tx ring descriptors. */
struct pcnet32_rx_head {
u32 base;
s16 buf_length;
s16 status;
u32 msg_length;
u32 reserved;
};
struct pcnet32_tx_head {
u32 base;
s16 length;
s16 status;
u32 misc;
u32 reserved;
};
/* The PCNET32 32-Bit initialization block, described in databook. */
struct pcnet32_init_block {
u16 mode;
u16 tlen_rlen;
u8 phys_addr[6];
u16 reserved;
u32 filter[2];
/* Receive and transmit ring base, along with extra bits. */
u32 rx_ring;
u32 tx_ring;
};
struct pcnet32_private {
/* The Tx and Rx ring entries must be aligned on 16-byte boundaries
in 32bit mode. */
struct pcnet32_rx_head rx_ring[RX_RING_SIZE];
struct pcnet32_tx_head tx_ring[TX_RING_SIZE];
struct pcnet32_init_block init_block;
const char *name;
struct device *next_module;
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
struct sk_buff* tx_skbuff[TX_RING_SIZE];
unsigned long rx_buffs; /* Address of Rx and Tx buffers. */
int cur_rx, cur_tx; /* The next free ring entry */
int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
struct enet_statistics stats;
char tx_full;
unsigned long lock;
};
static struct pcnet_chip_type {
int id_number;
const char *name;
int flags;
} chip_table[] = {
{0x2420, "PCnet/PCI 79C970", 0},
{0x2430, "PCnet32", 0},
{0x2621, "PCnet/PCI II 79C970A", 0},
{0x2623, "PCnet/FAST 79C971", 0},
{0x2624, "PCnet/FAST+ 79C972", 0},
{0x0, "PCnet32 (unknown)", 0},
};
/* Index of functions. */
int pcnet32_probe(struct device *dev);
static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line);
static int pcnet32_open(struct device *dev);
static void pcnet32_init_ring(struct device *dev);
static int pcnet32_start_xmit(struct sk_buff *skb, struct device *dev);
static int pcnet32_rx(struct device *dev);
static void pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static int pcnet32_close(struct device *dev);
static struct enet_statistics *pcnet32_get_stats(struct device *dev);
static void pcnet32_set_multicast_list(struct device *dev);
/* A list of all installed PCnet32 devices, for removing the driver module. */
static struct device *root_pcnet32_dev = NULL;
int pcnet32_probe (struct device *dev)
{
static int pci_index = 0; /* Static, for multiple probe calls. */
int cards_found = 0;
if ( ! pcibios_present())
return ENODEV;
for (;pci_index < 0xff; pci_index++) {
u8 irq_line;
u16 pci_command, new_command;
unsigned char pci_bus, pci_device_fn;
u32 pci_ioaddr;
if (pcibios_find_device (PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE,
pci_index, &pci_bus, &pci_device_fn)
!= PCIBIOS_SUCCESSFUL)
break;
pcibios_read_config_byte(pci_bus, pci_device_fn,
PCI_INTERRUPT_LINE, &irq_line);
pcibios_read_config_dword(pci_bus, pci_device_fn,
PCI_BASE_ADDRESS_0, &pci_ioaddr);
/* Remove I/O space marker in bit 0. */
pci_ioaddr &= ~3;
/* Avoid already found cards from previous pcnet32_probe() calls */
if (check_region(pci_ioaddr, PCNET32_TOTAL_SIZE))
continue;
/* Activate the card: fix for brain-damaged Win98 BIOSes. */
pcibios_read_config_word(pci_bus, pci_device_fn,
PCI_COMMAND, &pci_command);
new_command = pci_command | PCI_COMMAND_MASTER|PCI_COMMAND_IO;
if (pci_command != new_command) {
printk(KERN_INFO " The PCI BIOS has not enabled the AMD Ethernet"
" device at %2x-%2x."
" Updating PCI command %4.4x->%4.4x.\n",
pci_bus, pci_device_fn, pci_command, new_command);
pcibios_write_config_word(pci_bus, pci_device_fn,
PCI_COMMAND, new_command);
}
if (pcnet32_probe1(dev, pci_ioaddr, irq_line) != 0) {
/* Should never happen. */
printk(KERN_ERR "pcnet32.c: Probe of PCI card at %#x failed.\n",
pci_ioaddr);
} else
dev = 0;
cards_found++;
}
return cards_found ? 0 : -ENODEV;
}
/* pcnet32_probe1 */
static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line)
{
struct pcnet32_private *lp;
int i;
const char *chipname;
/* check if there is really a pcnet chip on that ioaddr */
if ((inb(ioaddr + 14) != 0x57) || (inb(ioaddr + 15) != 0x57))
return ENODEV;
inw(ioaddr+PCNET32_RESET); /* Reset the PCNET32 */
outw(0x0000, ioaddr+PCNET32_ADDR); /* Switch to window 0 */
if (inw(ioaddr+PCNET32_DATA) != 0x0004)
return ENODEV;
/* Get the version of the chip. */
outw(88, ioaddr+PCNET32_ADDR);
if (inw(ioaddr+PCNET32_ADDR) != 88) {
/* should never happen */
return ENODEV;
} else { /* Good, it's a newer chip. */
int chip_version = inw(ioaddr+PCNET32_DATA);
outw(89, ioaddr+PCNET32_ADDR);
chip_version |= inw(ioaddr+PCNET32_DATA) << 16;
if (pcnet32_debug > 2)
printk(" PCnet chip version is %#x.\n", chip_version);
if ((chip_version & 0xfff) != 0x003)
return ENODEV;
chip_version = (chip_version >> 12) & 0xffff;
for (i = 0; chip_table[i].id_number; i++)
if (chip_table[i].id_number == chip_version)
break;
chipname = chip_table[i].name;
}
dev = init_etherdev(dev, 0);
printk("%s: %s at %#3x,", dev->name, chipname, ioaddr);
/* There is a 16 byte station address PROM at the base address.
The first six bytes are the station address. */
for (i = 0; i < 6; i++)
printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
printk("\n");
dev->base_addr = ioaddr;
request_region(ioaddr, PCNET32_TOTAL_SIZE, dev->name);
/* Data structures used by the PCnet32 are 16byte aligned and DMAble. */
lp = (struct pcnet32_private *)
(((unsigned long)kmalloc(sizeof(*lp)+15, GFP_DMA | GFP_KERNEL)+15) & ~15);
memset(lp, 0, sizeof(*lp));
dev->priv = lp;
lp->next_module = root_pcnet32_dev;
root_pcnet32_dev = dev;
lp->name = chipname;
lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL);
lp->init_block.mode = le16_to_cpu(0x0003); /* Disable Rx and Tx. */
lp->init_block.tlen_rlen = le16_to_cpu(TX_RING_LEN_BITS | RX_RING_LEN_BITS);
for (i = 0; i < 6; i++)
lp->init_block.phys_addr[i] = dev->dev_addr[i];
lp->init_block.filter[0] = 0x00000000;
lp->init_block.filter[1] = 0x00000000;
lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring));
lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
/* switch pcnet32 to 32bit mode */
outw(0x0014, ioaddr+PCNET32_ADDR);
outw(0x0002, ioaddr+PCNET32_BUS_IF);
outw(0x0001, ioaddr+PCNET32_ADDR);
inw(ioaddr+PCNET32_ADDR);
outw(virt_to_bus(&lp->init_block) & 0xffff, ioaddr+PCNET32_DATA);
outw(0x0002, ioaddr+PCNET32_ADDR);
inw(ioaddr+PCNET32_ADDR);
outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
outw(0x0000, ioaddr+PCNET32_ADDR);
inw(ioaddr+PCNET32_ADDR);
dev->irq = irq_line;
if (pcnet32_debug > 0)
printk("%s", version);
/* The PCNET32-specific entries in the device structure. */
dev->open = &pcnet32_open;
dev->hard_start_xmit = &pcnet32_start_xmit;
dev->stop = &pcnet32_close;
dev->get_stats = &pcnet32_get_stats;
dev->set_multicast_list = &pcnet32_set_multicast_list;
/* Fill in the generic fields of the device structure. */
ether_setup(dev);
return 0;
}
static int
pcnet32_open(struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
unsigned int ioaddr = dev->base_addr;
int i;
if (dev->irq == 0 ||
request_irq(dev->irq, &pcnet32_interrupt, SA_SHIRQ,
dev->name, (void *)dev)) {
return -EAGAIN;
}
MOD_INC_USE_COUNT;
/* Reset the PCNET32 */
inw(ioaddr+PCNET32_RESET);
/* switch pcnet32 to 32bit mode */
outw(0x0014, ioaddr+PCNET32_ADDR);
outw(0x0002, ioaddr+PCNET32_BUS_IF);
/* Turn on auto-select of media (AUI, BNC). */
outw(0x0002, ioaddr+PCNET32_ADDR);
/* only touch autoselect bit */
outw(inw(ioaddr+PCNET32_BUS_IF) | 0x0002, ioaddr+PCNET32_BUS_IF);
if (pcnet32_debug > 1)
printk("%s: pcnet32_open() irq %d tx/rx rings %#x/%#x init %#x.\n",
dev->name, dev->irq,
(u32) virt_to_bus(lp->tx_ring),
(u32) virt_to_bus(lp->rx_ring),
(u32) virt_to_bus(&lp->init_block));
/* check for ATLAS T1/E1 LAW card */
if (dev->dev_addr[0] == 0x00 && dev->dev_addr[1] == 0xe0 && dev->dev_addr[2] == 0x75) {
/* select GPSI mode */
lp->init_block.mode = 0x0100;
outw(0x0002, ioaddr+PCNET32_ADDR);
outw(inw(ioaddr+PCNET32_BUS_IF) & ~2, ioaddr+PCNET32_BUS_IF);
/* switch full duplex on */
outw(0x0009, ioaddr+PCNET32_ADDR);
outw(inw(ioaddr+PCNET32_BUS_IF) | 1, ioaddr+PCNET32_BUS_IF);
} else
lp->init_block.mode = 0x0000;
lp->init_block.filter[0] = 0x00000000;
lp->init_block.filter[1] = 0x00000000;
pcnet32_init_ring(dev);
/* Re-initialize the PCNET32, and start it when done. */
outw(0x0001, ioaddr+PCNET32_ADDR);
outw(virt_to_bus(&lp->init_block) &0xffff, ioaddr+PCNET32_DATA);
outw(0x0002, ioaddr+PCNET32_ADDR);
outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA);
outw(0x0004, ioaddr+PCNET32_ADDR);
outw(0x0915, ioaddr+PCNET32_DATA);
outw(0x0000, ioaddr+PCNET32_ADDR);
outw(0x0001, ioaddr+PCNET32_DATA);
dev->tbusy = 0;
dev->interrupt = 0;
dev->start = 1;
i = 0;
while (i++ < 100)
if (inw(ioaddr+PCNET32_DATA) & 0x0100)
break;
/*
* We used to clear the InitDone bit, 0x0100, here but Mark Stockton
* reports that doing so triggers a bug in the '974.
*/
outw(0x0042, ioaddr+PCNET32_DATA);
if (pcnet32_debug > 2)
printk("%s: PCNET32 open after %d ticks, init block %#x csr0 %4.4x.\n",
dev->name, i, (u32) virt_to_bus(&lp->init_block), inw(ioaddr+PCNET32_DATA));
return 0; /* Always succeed */
}
/*
* The LANCE has been halted for one reason or another (busmaster memory
* arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
* etc.). Modern LANCE variants always reload their ring-buffer
* configuration when restarted, so we must reinitialize our ring
* context before restarting. As part of this reinitialization,
* find all packets still on the Tx ring and pretend that they had been
* sent (in effect, drop the packets on the floor) - the higher-level
* protocols will time out and retransmit. It'd be better to shuffle
* these skbs to a temp list and then actually re-Tx them after
* restarting the chip, but I'm too lazy to do so right now. [email protected]
*/
static void
pcnet32_purge_tx_ring(struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
int i;
for (i = 0; i < TX_RING_SIZE; i++) {
if (lp->tx_skbuff[i]) {
dev_kfree_skb(lp->tx_skbuff[i], FREE_WRITE);
lp->tx_skbuff[i] = NULL;
}
}
}
/* Initialize the PCNET32 Rx and Tx rings. */
static void
pcnet32_init_ring(struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
int i;
lp->lock = 0, lp->tx_full = 0;
lp->cur_rx = lp->cur_tx = 0;
lp->dirty_rx = lp->dirty_tx = 0;
for (i = 0; i < RX_RING_SIZE; i++) {
lp->rx_ring[i].base = (u32)le32_to_cpu(virt_to_bus((char *)lp->rx_buffs + i*PKT_BUF_SZ));
lp->rx_ring[i].buf_length = le16_to_cpu(-PKT_BUF_SZ);
lp->rx_ring[i].status = le16_to_cpu(0x8000);
}
/* The Tx buffer address is filled in as needed, but we do need to clear
the upper ownership bit. */
for (i = 0; i < TX_RING_SIZE; i++) {
lp->tx_ring[i].base = 0;
lp->tx_ring[i].status = 0;
}
lp->init_block.tlen_rlen = TX_RING_LEN_BITS | RX_RING_LEN_BITS;
for (i = 0; i < 6; i++)
lp->init_block.phys_addr[i] = dev->dev_addr[i];
lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring));
lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring));
}
static void
pcnet32_restart(struct device *dev, unsigned int csr0_bits, int must_reinit)
{
int i;
unsigned int ioaddr = dev->base_addr;
pcnet32_purge_tx_ring(dev);
pcnet32_init_ring(dev);
outw(0x0000, ioaddr + PCNET32_ADDR);
/* ReInit Ring */
outw(0x0001, ioaddr + PCNET32_DATA);
i = 0;
while (i++ < 100)
if (inw(ioaddr+PCNET32_DATA) & 0x0100)
break;
outw(csr0_bits, ioaddr + PCNET32_DATA);
}
static int
pcnet32_start_xmit(struct sk_buff *skb, struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
unsigned int ioaddr = dev->base_addr;
int entry;
unsigned long flags;
/* Transmitter timeout, serious problems. */
if (dev->tbusy) {
int tickssofar = jiffies - dev->trans_start;
if (tickssofar < 20)
return 1;
outw(0, ioaddr+PCNET32_ADDR);
printk("%s: transmit timed out, status %4.4x, resetting.\n",
dev->name, inw(ioaddr+PCNET32_DATA));
outw(0x0004, ioaddr+PCNET32_DATA);
lp->stats.tx_errors++;
#ifndef final_version
{
int i;
printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
lp->cur_rx);
for (i = 0 ; i < RX_RING_SIZE; i++)
printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
lp->rx_ring[i].msg_length, (unsigned)lp->rx_ring[i].status);
for (i = 0 ; i < TX_RING_SIZE; i++)
printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
lp->tx_ring[i].base, -lp->tx_ring[i].length,
lp->tx_ring[i].misc, (unsigned)lp->tx_ring[i].status);
printk("\n");
}
#endif
pcnet32_restart(dev, 0x0042, 1);
dev->tbusy = 0;
dev->trans_start = jiffies;
return 0;
}
if (pcnet32_debug > 3) {
outw(0x0000, ioaddr+PCNET32_ADDR);
printk("%s: pcnet32_start_xmit() called, csr0 %4.4x.\n", dev->name,
inw(ioaddr+PCNET32_DATA));
outw(0x0000, ioaddr+PCNET32_DATA);
}
/* Block a timer-based transmit from overlapping. This could better be
done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
if (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
printk("%s: Transmitter access conflict.\n", dev->name);
return 1;
}
if (test_and_set_bit(0, (void*)&lp->lock) != 0) {
if (pcnet32_debug > 0)
printk("%s: tx queue lock!.\n", dev->name);
/* don't clear dev->tbusy flag. */
return 1;
}
/* Fill in a Tx ring entry */
/* Mask to ring buffer boundary. */
entry = lp->cur_tx & TX_RING_MOD_MASK;
/* Caution: the write order is important here, set the base address
with the "ownership" bits last. */
lp->tx_ring[entry].length = le16_to_cpu(-skb->len);
lp->tx_ring[entry].misc = 0x00000000;
lp->tx_skbuff[entry] = skb;
lp->tx_ring[entry].base = (u32)le32_to_cpu(virt_to_bus(skb->data));
lp->tx_ring[entry].status = le16_to_cpu(0x8300);
lp->cur_tx++;
/* Trigger an immediate send poll. */
outw(0x0000, ioaddr+PCNET32_ADDR);
outw(0x0048, ioaddr+PCNET32_DATA);
dev->trans_start = jiffies;
save_flags(flags);
cli();
lp->lock = 0;
if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
clear_bit(0, (void*)&dev->tbusy);
else
lp->tx_full = 1;
restore_flags(flags);
return 0;
}
/* The PCNET32 interrupt handler. */
static void
pcnet32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
struct device *dev = (struct device *)dev_id;
struct pcnet32_private *lp;
unsigned int csr0, ioaddr;
int boguscnt = max_interrupt_work;
int must_restart;
if (dev == NULL) {
printk ("pcnet32_interrupt(): irq %d for unknown device.\n", irq);
return;
}
ioaddr = dev->base_addr;
lp = (struct pcnet32_private *)dev->priv;
if (dev->interrupt)
printk("%s: Re-entering the interrupt handler.\n", dev->name);
dev->interrupt = 1;
outw(0x00, dev->base_addr + PCNET32_ADDR);
while ((csr0 = inw(dev->base_addr + PCNET32_DATA)) & 0x8600
&& --boguscnt >= 0) {
/* Acknowledge all of the current interrupt sources ASAP. */
outw(csr0 & ~0x004f, dev->base_addr + PCNET32_DATA);
must_restart = 0;
if (pcnet32_debug > 5)
printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
dev->name, csr0, inw(dev->base_addr + PCNET32_DATA));
if (csr0 & 0x0400) /* Rx interrupt */
pcnet32_rx(dev);
if (csr0 & 0x0200) { /* Tx-done interrupt */
int dirty_tx = lp->dirty_tx;
while (dirty_tx < lp->cur_tx) {
int entry = dirty_tx & TX_RING_MOD_MASK;
int status = (short)le16_to_cpu(lp->tx_ring[entry].status);
if (status < 0)
break; /* It still hasn't been Txed */
lp->tx_ring[entry].base = 0;
if (status & 0x4000) {
/* There was an major error, log it. */
int err_status = le16_to_cpu(lp->tx_ring[entry].misc);
lp->stats.tx_errors++;
if (err_status & 0x04000000) lp->stats.tx_aborted_errors++;
if (err_status & 0x08000000) lp->stats.tx_carrier_errors++;
if (err_status & 0x10000000) lp->stats.tx_window_errors++;
if (err_status & 0x40000000) {
/* Ackk! On FIFO errors the Tx unit is turned off! */
lp->stats.tx_fifo_errors++;
/* Remove this verbosity later! */
printk("%s: Tx FIFO error! Status %4.4x.\n",
dev->name, csr0);
/* Restart the chip. */
must_restart = 1;
}
} else {
if (status & 0x1800)
lp->stats.collisions++;
lp->stats.tx_packets++;
}
/* We must free the original skb */
if (lp->tx_skbuff[entry]) {
dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE);
lp->tx_skbuff[entry] = 0;
}
dirty_tx++;
}
#ifndef final_version
if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) {
printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
dirty_tx, lp->cur_tx, lp->tx_full);
dirty_tx += TX_RING_SIZE;
}
#endif
if (lp->tx_full && dev->tbusy
&& dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) {
/* The ring is no longer full, clear tbusy. */
lp->tx_full = 0;
clear_bit(0, (void*)&dev->tbusy);
mark_bh(NET_BH);
}
lp->dirty_tx = dirty_tx;
}
/* Log misc errors. */
if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
if (csr0 & 0x1000) {
/*
* this happens when our receive ring is full. This
* shouldn't be a problem as we will see normal rx
* interrupts for the frames in the receive ring. But
* there are some PCI chipsets (I can reproduce this
* on SP3G with Intel saturn chipset) which have some-
* times problems and will fill up the receive ring
* with error descriptors. In this situation we don't
* get a rx interrupt, but a missed frame interrupt
* sooner or later. So we try to clean up our receive
* ring here.
*/
pcnet32_rx(dev);
lp->stats.rx_errors++; /* Missed a Rx frame. */
}
if (csr0 & 0x0800) {
printk("%s: Bus master arbitration failure, status %4.4x.\n",
dev->name, csr0);
/* Restart the chip. */
must_restart = 1;
}
if (must_restart) {
/* stop the chip to clear the error condition, then restart */
outw(0x0000, dev->base_addr + PCNET32_ADDR);
outw(0x0004, dev->base_addr + PCNET32_DATA);
pcnet32_restart(dev, 0x0002, 0);
}
}
/* Clear any other interrupt, and set interrupt enable. */
outw(0x0000, dev->base_addr + PCNET32_ADDR);
outw(0x7940, dev->base_addr + PCNET32_DATA);
if (pcnet32_debug > 4)
printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
dev->name, inw(ioaddr + PCNET32_ADDR),
inw(dev->base_addr + PCNET32_DATA));
dev->interrupt = 0;
return;
}
static int
pcnet32_rx(struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
int entry = lp->cur_rx & RX_RING_MOD_MASK;
int i;
/* If we own the next entry, it's a new packet. Send it up. */
while ((short)le16_to_cpu(lp->rx_ring[entry].status) >= 0) {
int status = (short)le16_to_cpu(lp->rx_ring[entry].status) >> 8;
if (status != 0x03) { /* There was an error. */
/* There is a tricky error noted by John Murphy,
<[email protected]> 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 & 0x01) /* Only count a general error at the */
lp->stats.rx_errors++; /* end of a packet.*/
if (status & 0x20) lp->stats.rx_frame_errors++;
if (status & 0x10) lp->stats.rx_over_errors++;
if (status & 0x08) lp->stats.rx_crc_errors++;
if (status & 0x04) lp->stats.rx_fifo_errors++;
lp->rx_ring[entry].status &= le16_to_cpu(0x03ff);
}
else
{
/* Malloc up new buffer, compatible with net-2e. */
short pkt_len = (le32_to_cpu(lp->rx_ring[entry].msg_length) & 0xfff)-4;
struct sk_buff *skb;
if(pkt_len < 60) {
printk("%s: Runt packet!\n",dev->name);
lp->stats.rx_errors++;
} else {
skb = dev_alloc_skb(pkt_len+2);
if (skb == NULL) {
printk("%s: Memory squeeze, deferring packet.\n",
dev->name);
for (i=0; i < RX_RING_SIZE; i++)
if ((short)le16_to_cpu(lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].status) < 0)
break;
if (i > RX_RING_SIZE -2)
{
lp->stats.rx_dropped++;
lp->rx_ring[entry].status |= le16_to_cpu(0x8000);
lp->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,
(unsigned char *)bus_to_virt(le32_to_cpu(lp->rx_ring[entry].base)),
pkt_len,0);
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb);
lp->stats.rx_packets++;
}
}
/* The docs say that the buffer length isn't touched, but Andrew Boyd
of QNX reports that some revs of the 79C965 clear it. */
lp->rx_ring[entry].buf_length = le16_to_cpu(-PKT_BUF_SZ);
lp->rx_ring[entry].status |= le16_to_cpu(0x8000);
entry = (++lp->cur_rx) & RX_RING_MOD_MASK;
}
/* 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 int
pcnet32_close(struct device *dev)
{
unsigned int ioaddr = dev->base_addr;
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
dev->start = 0;
set_bit(0, (void*)&dev->tbusy);
outw(112, ioaddr+PCNET32_ADDR);
lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
outw(0, ioaddr+PCNET32_ADDR);
if (pcnet32_debug > 1)
printk("%s: Shutting down ethercard, status was %2.2x.\n",
dev->name, inw(ioaddr+PCNET32_DATA));
/* We stop the PCNET32 here -- it occasionally polls
memory if we don't. */
outw(0x0004, ioaddr+PCNET32_DATA);
free_irq(dev->irq, dev);
MOD_DEC_USE_COUNT;
return 0;
}
static struct enet_statistics *pcnet32_get_stats(struct device *dev)
{
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
unsigned int ioaddr = dev->base_addr;
unsigned short saved_addr;
unsigned long flags;
save_flags(flags);
cli();
saved_addr = inw(ioaddr+PCNET32_ADDR);
outw(112, ioaddr+PCNET32_ADDR);
lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA);
outw(saved_addr, ioaddr+PCNET32_ADDR);
restore_flags(flags);
return &lp->stats;
}
/* Set or clear the multicast filter for this adaptor.
*/
static void pcnet32_set_multicast_list(struct device *dev)
{
unsigned int ioaddr = dev->base_addr;
struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv;
if (dev->flags&IFF_PROMISC) {
/* Log any net taps. */
printk("%s: Promiscuous mode enabled.\n", dev->name);
lp->init_block.mode |= 0x8000;
} else {
int num_addrs=dev->mc_count;
if(dev->flags&IFF_ALLMULTI)
num_addrs=1;
/* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */
memset(lp->init_block.filter , (num_addrs == 0) ? 0 : -1, sizeof(lp->init_block.filter));
lp->init_block.mode &= ~0x8000;
}
outw(0, ioaddr+PCNET32_ADDR);
outw(0x0004, ioaddr+PCNET32_DATA); /* Temporarily stop the lance. */
pcnet32_restart(dev, 0x0042, 0); /* Resume normal operation */
}
#ifdef MODULE
#if LINUX_VERSION_CODE > 0x20118
MODULE_AUTHOR("Donald Becker <[email protected]>");
MODULE_DESCRIPTION("AMD PCnet/PCI ethernet driver");
MODULE_PARM(debug, "i");
MODULE_PARM(max_interrupt_work, "i");
MODULE_PARM(rx_copybreak, "i");
MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
#endif
/* An additional parameter that may be passed in... */
static int debug = -1;
int
init_module(void)
{
if (debug >= 0)
pcnet32_debug = debug;
#ifdef CARDBUS
register_driver(&pcnet32_ops);
return 0;
#else
return pcnet32_probe(NULL);
#endif
}
void
cleanup_module(void)
{
struct device *next_dev;
#ifdef CARDBUS
unregister_driver(&pcnet32_ops);
#endif
/* No need to check MOD_IN_USE, as sys_delete_module() checks. */
while (root_pcnet32_dev) {
next_dev = ((struct pcnet32_private *)root_pcnet32_dev->priv)->next_module;
unregister_netdev(root_pcnet32_dev);
release_region(root_pcnet32_dev->base_addr, PCNET32_TOTAL_SIZE);
kfree(root_pcnet32_dev);
root_pcnet32_dev = next_dev;
}
}
#endif /* MODULE */
/*
* Local variables:
* compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c pcnet32.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* End:
*/
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