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linux/drivers/net/wan/lmc/lmc_main.c
Eric Dumazet 807540baae drivers/net: return operator cleanup 
Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-26 18:34:29 -07:00

2145 lines
62 KiB
C
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/*
* Copyright (c) 1997-2000 LAN Media Corporation (LMC)
* All rights reserved. www.lanmedia.com
* Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
*
* This code is written by:
* Andrew Stanley-Jones (asj@cban.com)
* Rob Braun (bbraun@vix.com),
* Michael Graff (explorer@vix.com) and
* Matt Thomas (matt@3am-software.com).
*
* With Help By:
* David Boggs
* Ron Crane
* Alan Cox
*
* This software may be used and distributed according to the terms
* of the GNU General Public License version 2, incorporated herein by reference.
*
* Driver for the LanMedia LMC5200, LMC5245, LMC1000, LMC1200 cards.
*
* To control link specific options lmcctl is required.
* It can be obtained from ftp.lanmedia.com.
*
* Linux driver notes:
* Linux uses the device struct lmc_private to pass private information
* arround.
*
* The initialization portion of this driver (the lmc_reset() and the
* lmc_dec_reset() functions, as well as the led controls and the
* lmc_initcsrs() functions.
*
* The watchdog function runs every second and checks to see if
* we still have link, and that the timing source is what we expected
* it to be. If link is lost, the interface is marked down, and
* we no longer can transmit.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdlc.h>
#include <linux/init.h>
#include <linux/in.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <asm/processor.h> /* Processor type for cache alignment. */
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
//#include <asm/spinlock.h>
#define DRIVER_MAJOR_VERSION 1
#define DRIVER_MINOR_VERSION 34
#define DRIVER_SUB_VERSION 0
#define DRIVER_VERSION ((DRIVER_MAJOR_VERSION << 8) + DRIVER_MINOR_VERSION)
#include "lmc.h"
#include "lmc_var.h"
#include "lmc_ioctl.h"
#include "lmc_debug.h"
#include "lmc_proto.h"
static int LMC_PKT_BUF_SZ = 1542;
static DEFINE_PCI_DEVICE_TABLE(lmc_pci_tbl) = {
{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP_FAST,
PCI_VENDOR_ID_LMC, PCI_ANY_ID },
{ PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TULIP_FAST,
PCI_ANY_ID, PCI_VENDOR_ID_LMC },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, lmc_pci_tbl);
MODULE_LICENSE("GPL v2");
static netdev_tx_t lmc_start_xmit(struct sk_buff *skb,
struct net_device *dev);
static int lmc_rx (struct net_device *dev);
static int lmc_open(struct net_device *dev);
static int lmc_close(struct net_device *dev);
static struct net_device_stats *lmc_get_stats(struct net_device *dev);
static irqreturn_t lmc_interrupt(int irq, void *dev_instance);
static void lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base, size_t csr_size);
static void lmc_softreset(lmc_softc_t * const);
static void lmc_running_reset(struct net_device *dev);
static int lmc_ifdown(struct net_device * const);
static void lmc_watchdog(unsigned long data);
static void lmc_reset(lmc_softc_t * const sc);
static void lmc_dec_reset(lmc_softc_t * const sc);
static void lmc_driver_timeout(struct net_device *dev);
/*
* linux reserves 16 device specific IOCTLs. We call them
* LMCIOC* to control various bits of our world.
*/
int lmc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) /*fold00*/
{
lmc_softc_t *sc = dev_to_sc(dev);
lmc_ctl_t ctl;
int ret = -EOPNOTSUPP;
u16 regVal;
unsigned long flags;
lmc_trace(dev, "lmc_ioctl in");
/*
* Most functions mess with the structure
* Disable interrupts while we do the polling
*/
switch (cmd) {
/*
* Return current driver state. Since we keep this up
* To date internally, just copy this out to the user.
*/
case LMCIOCGINFO: /*fold01*/
if (copy_to_user(ifr->ifr_data, &sc->ictl, sizeof(lmc_ctl_t)))
ret = -EFAULT;
else
ret = 0;
break;
case LMCIOCSINFO: /*fold01*/
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
if(dev->flags & IFF_UP){
ret = -EBUSY;
break;
}
if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
ret = -EFAULT;
break;
}
spin_lock_irqsave(&sc->lmc_lock, flags);
sc->lmc_media->set_status (sc, &ctl);
if(ctl.crc_length != sc->ictl.crc_length) {
sc->lmc_media->set_crc_length(sc, ctl.crc_length);
if (sc->ictl.crc_length == LMC_CTL_CRC_LENGTH_16)
sc->TxDescriptControlInit |= LMC_TDES_ADD_CRC_DISABLE;
else
sc->TxDescriptControlInit &= ~LMC_TDES_ADD_CRC_DISABLE;
}
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0;
break;
case LMCIOCIFTYPE: /*fold01*/
{
u16 old_type = sc->if_type;
u16 new_type;
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
if (copy_from_user(&new_type, ifr->ifr_data, sizeof(u16))) {
ret = -EFAULT;
break;
}
if (new_type == old_type)
{
ret = 0 ;
break; /* no change */
}
spin_lock_irqsave(&sc->lmc_lock, flags);
lmc_proto_close(sc);
sc->if_type = new_type;
lmc_proto_attach(sc);
ret = lmc_proto_open(sc);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
break;
}
case LMCIOCGETXINFO: /*fold01*/
spin_lock_irqsave(&sc->lmc_lock, flags);
sc->lmc_xinfo.Magic0 = 0xBEEFCAFE;
sc->lmc_xinfo.PciCardType = sc->lmc_cardtype;
sc->lmc_xinfo.PciSlotNumber = 0;
sc->lmc_xinfo.DriverMajorVersion = DRIVER_MAJOR_VERSION;
sc->lmc_xinfo.DriverMinorVersion = DRIVER_MINOR_VERSION;
sc->lmc_xinfo.DriverSubVersion = DRIVER_SUB_VERSION;
sc->lmc_xinfo.XilinxRevisionNumber =
lmc_mii_readreg (sc, 0, 3) & 0xf;
sc->lmc_xinfo.MaxFrameSize = LMC_PKT_BUF_SZ;
sc->lmc_xinfo.link_status = sc->lmc_media->get_link_status (sc);
sc->lmc_xinfo.mii_reg16 = lmc_mii_readreg (sc, 0, 16);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
sc->lmc_xinfo.Magic1 = 0xDEADBEEF;
if (copy_to_user(ifr->ifr_data, &sc->lmc_xinfo,
sizeof(struct lmc_xinfo)))
ret = -EFAULT;
else
ret = 0;
break;
case LMCIOCGETLMCSTATS:
spin_lock_irqsave(&sc->lmc_lock, flags);
if (sc->lmc_cardtype == LMC_CARDTYPE_T1) {
lmc_mii_writereg(sc, 0, 17, T1FRAMER_FERR_LSB);
sc->extra_stats.framingBitErrorCount +=
lmc_mii_readreg(sc, 0, 18) & 0xff;
lmc_mii_writereg(sc, 0, 17, T1FRAMER_FERR_MSB);
sc->extra_stats.framingBitErrorCount +=
(lmc_mii_readreg(sc, 0, 18) & 0xff) << 8;
lmc_mii_writereg(sc, 0, 17, T1FRAMER_LCV_LSB);
sc->extra_stats.lineCodeViolationCount +=
lmc_mii_readreg(sc, 0, 18) & 0xff;
lmc_mii_writereg(sc, 0, 17, T1FRAMER_LCV_MSB);
sc->extra_stats.lineCodeViolationCount +=
(lmc_mii_readreg(sc, 0, 18) & 0xff) << 8;
lmc_mii_writereg(sc, 0, 17, T1FRAMER_AERR);
regVal = lmc_mii_readreg(sc, 0, 18) & 0xff;
sc->extra_stats.lossOfFrameCount +=
(regVal & T1FRAMER_LOF_MASK) >> 4;
sc->extra_stats.changeOfFrameAlignmentCount +=
(regVal & T1FRAMER_COFA_MASK) >> 2;
sc->extra_stats.severelyErroredFrameCount +=
regVal & T1FRAMER_SEF_MASK;
}
spin_unlock_irqrestore(&sc->lmc_lock, flags);
if (copy_to_user(ifr->ifr_data, &sc->lmc_device->stats,
sizeof(sc->lmc_device->stats)) ||
copy_to_user(ifr->ifr_data + sizeof(sc->lmc_device->stats),
&sc->extra_stats, sizeof(sc->extra_stats)))
ret = -EFAULT;
else
ret = 0;
break;
case LMCIOCCLEARLMCSTATS:
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
spin_lock_irqsave(&sc->lmc_lock, flags);
memset(&sc->lmc_device->stats, 0, sizeof(sc->lmc_device->stats));
memset(&sc->extra_stats, 0, sizeof(sc->extra_stats));
sc->extra_stats.check = STATCHECK;
sc->extra_stats.version_size = (DRIVER_VERSION << 16) +
sizeof(sc->lmc_device->stats) + sizeof(sc->extra_stats);
sc->extra_stats.lmc_cardtype = sc->lmc_cardtype;
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0;
break;
case LMCIOCSETCIRCUIT: /*fold01*/
if (!capable(CAP_NET_ADMIN)){
ret = -EPERM;
break;
}
if(dev->flags & IFF_UP){
ret = -EBUSY;
break;
}
if (copy_from_user(&ctl, ifr->ifr_data, sizeof(lmc_ctl_t))) {
ret = -EFAULT;
break;
}
spin_lock_irqsave(&sc->lmc_lock, flags);
sc->lmc_media->set_circuit_type(sc, ctl.circuit_type);
sc->ictl.circuit_type = ctl.circuit_type;
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0;
break;
case LMCIOCRESET: /*fold01*/
if (!capable(CAP_NET_ADMIN)){
ret = -EPERM;
break;
}
spin_lock_irqsave(&sc->lmc_lock, flags);
/* Reset driver and bring back to current state */
printk (" REG16 before reset +%04x\n", lmc_mii_readreg (sc, 0, 16));
lmc_running_reset (dev);
printk (" REG16 after reset +%04x\n", lmc_mii_readreg (sc, 0, 16));
LMC_EVENT_LOG(LMC_EVENT_FORCEDRESET, LMC_CSR_READ (sc, csr_status), lmc_mii_readreg (sc, 0, 16));
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0;
break;
#ifdef DEBUG
case LMCIOCDUMPEVENTLOG:
if (copy_to_user(ifr->ifr_data, &lmcEventLogIndex, sizeof(u32))) {
ret = -EFAULT;
break;
}
if (copy_to_user(ifr->ifr_data + sizeof(u32), lmcEventLogBuf,
sizeof(lmcEventLogBuf)))
ret = -EFAULT;
else
ret = 0;
break;
#endif /* end ifdef _DBG_EVENTLOG */
case LMCIOCT1CONTROL: /*fold01*/
if (sc->lmc_cardtype != LMC_CARDTYPE_T1){
ret = -EOPNOTSUPP;
break;
}
break;
case LMCIOCXILINX: /*fold01*/
{
struct lmc_xilinx_control xc; /*fold02*/
if (!capable(CAP_NET_ADMIN)){
ret = -EPERM;
break;
}
/*
* Stop the xwitter whlie we restart the hardware
*/
netif_stop_queue(dev);
if (copy_from_user(&xc, ifr->ifr_data, sizeof(struct lmc_xilinx_control))) {
ret = -EFAULT;
break;
}
switch(xc.command){
case lmc_xilinx_reset: /*fold02*/
{
u16 mii;
spin_lock_irqsave(&sc->lmc_lock, flags);
mii = lmc_mii_readreg (sc, 0, 16);
/*
* Make all of them 0 and make input
*/
lmc_gpio_mkinput(sc, 0xff);
/*
* make the reset output
*/
lmc_gpio_mkoutput(sc, LMC_GEP_RESET);
/*
* RESET low to force configuration. This also forces
* the transmitter clock to be internal, but we expect to reset
* that later anyway.
*/
sc->lmc_gpio &= ~LMC_GEP_RESET;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
/*
* hold for more than 10 microseconds
*/
udelay(50);
sc->lmc_gpio |= LMC_GEP_RESET;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
/*
* stop driving Xilinx-related signals
*/
lmc_gpio_mkinput(sc, 0xff);
/* Reset the frammer hardware */
sc->lmc_media->set_link_status (sc, 1);
sc->lmc_media->set_status (sc, NULL);
// lmc_softreset(sc);
{
int i;
for(i = 0; i < 5; i++){
lmc_led_on(sc, LMC_DS3_LED0);
mdelay(100);
lmc_led_off(sc, LMC_DS3_LED0);
lmc_led_on(sc, LMC_DS3_LED1);
mdelay(100);
lmc_led_off(sc, LMC_DS3_LED1);
lmc_led_on(sc, LMC_DS3_LED3);
mdelay(100);
lmc_led_off(sc, LMC_DS3_LED3);
lmc_led_on(sc, LMC_DS3_LED2);
mdelay(100);
lmc_led_off(sc, LMC_DS3_LED2);
}
}
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0x0;
}
break;
case lmc_xilinx_load_prom: /*fold02*/
{
u16 mii;
int timeout = 500000;
spin_lock_irqsave(&sc->lmc_lock, flags);
mii = lmc_mii_readreg (sc, 0, 16);
/*
* Make all of them 0 and make input
*/
lmc_gpio_mkinput(sc, 0xff);
/*
* make the reset output
*/
lmc_gpio_mkoutput(sc, LMC_GEP_DP | LMC_GEP_RESET);
/*
* RESET low to force configuration. This also forces
* the transmitter clock to be internal, but we expect to reset
* that later anyway.
*/
sc->lmc_gpio &= ~(LMC_GEP_RESET | LMC_GEP_DP);
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
/*
* hold for more than 10 microseconds
*/
udelay(50);
sc->lmc_gpio |= LMC_GEP_DP | LMC_GEP_RESET;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
/*
* busy wait for the chip to reset
*/
while( (LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0 &&
(timeout-- > 0))
cpu_relax();
/*
* stop driving Xilinx-related signals
*/
lmc_gpio_mkinput(sc, 0xff);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
ret = 0x0;
break;
}
case lmc_xilinx_load: /*fold02*/
{
char *data;
int pos;
int timeout = 500000;
if (!xc.data) {
ret = -EINVAL;
break;
}
data = kmalloc(xc.len, GFP_KERNEL);
if (!data) {
printk(KERN_WARNING "%s: Failed to allocate memory for copy\n", dev->name);
ret = -ENOMEM;
break;
}
if(copy_from_user(data, xc.data, xc.len))
{
kfree(data);
ret = -ENOMEM;
break;
}
printk("%s: Starting load of data Len: %d at 0x%p == 0x%p\n", dev->name, xc.len, xc.data, data);
spin_lock_irqsave(&sc->lmc_lock, flags);
lmc_gpio_mkinput(sc, 0xff);
/*
* Clear the Xilinx and start prgramming from the DEC
*/
/*
* Set ouput as:
* Reset: 0 (active)
* DP: 0 (active)
* Mode: 1
*
*/
sc->lmc_gpio = 0x00;
sc->lmc_gpio &= ~LMC_GEP_DP;
sc->lmc_gpio &= ~LMC_GEP_RESET;
sc->lmc_gpio |= LMC_GEP_MODE;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
lmc_gpio_mkoutput(sc, LMC_GEP_MODE | LMC_GEP_DP | LMC_GEP_RESET);
/*
* Wait at least 10 us 20 to be safe
*/
udelay(50);
/*
* Clear reset and activate programming lines
* Reset: Input
* DP: Input
* Clock: Output
* Data: Output
* Mode: Output
*/
lmc_gpio_mkinput(sc, LMC_GEP_DP | LMC_GEP_RESET);
/*
* Set LOAD, DATA, Clock to 1
*/
sc->lmc_gpio = 0x00;
sc->lmc_gpio |= LMC_GEP_MODE;
sc->lmc_gpio |= LMC_GEP_DATA;
sc->lmc_gpio |= LMC_GEP_CLK;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
lmc_gpio_mkoutput(sc, LMC_GEP_DATA | LMC_GEP_CLK | LMC_GEP_MODE );
/*
* busy wait for the chip to reset
*/
while( (LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0 &&
(timeout-- > 0))
cpu_relax();
printk(KERN_DEBUG "%s: Waited %d for the Xilinx to clear it's memory\n", dev->name, 500000-timeout);
for(pos = 0; pos < xc.len; pos++){
switch(data[pos]){
case 0:
sc->lmc_gpio &= ~LMC_GEP_DATA; /* Data is 0 */
break;
case 1:
sc->lmc_gpio |= LMC_GEP_DATA; /* Data is 1 */
break;
default:
printk(KERN_WARNING "%s Bad data in xilinx programming data at %d, got %d wanted 0 or 1\n", dev->name, pos, data[pos]);
sc->lmc_gpio |= LMC_GEP_DATA; /* Assume it's 1 */
}
sc->lmc_gpio &= ~LMC_GEP_CLK; /* Clock to zero */
sc->lmc_gpio |= LMC_GEP_MODE;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
udelay(1);
sc->lmc_gpio |= LMC_GEP_CLK; /* Put the clack back to one */
sc->lmc_gpio |= LMC_GEP_MODE;
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
udelay(1);
}
if((LMC_CSR_READ(sc, csr_gp) & LMC_GEP_INIT) == 0){
printk(KERN_WARNING "%s: Reprogramming FAILED. Needs to be reprogrammed. (corrupted data)\n", dev->name);
}
else if((LMC_CSR_READ(sc, csr_gp) & LMC_GEP_DP) == 0){
printk(KERN_WARNING "%s: Reprogramming FAILED. Needs to be reprogrammed. (done)\n", dev->name);
}
else {
printk(KERN_DEBUG "%s: Done reprogramming Xilinx, %d bits, good luck!\n", dev->name, pos);
}
lmc_gpio_mkinput(sc, 0xff);
sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
kfree(data);
ret = 0;
break;
}
default: /*fold02*/
ret = -EBADE;
break;
}
netif_wake_queue(dev);
sc->lmc_txfull = 0;
}
break;
default: /*fold01*/
/* If we don't know what to do, give the protocol a shot. */
ret = lmc_proto_ioctl (sc, ifr, cmd);
break;
}
lmc_trace(dev, "lmc_ioctl out");
return ret;
}
/* the watchdog process that cruises around */
static void lmc_watchdog (unsigned long data) /*fold00*/
{
struct net_device *dev = (struct net_device *)data;
lmc_softc_t *sc = dev_to_sc(dev);
int link_status;
u32 ticks;
unsigned long flags;
lmc_trace(dev, "lmc_watchdog in");
spin_lock_irqsave(&sc->lmc_lock, flags);
if(sc->check != 0xBEAFCAFE){
printk("LMC: Corrupt net_device struct, breaking out\n");
spin_unlock_irqrestore(&sc->lmc_lock, flags);
return;
}
/* Make sure the tx jabber and rx watchdog are off,
* and the transmit and receive processes are running.
*/
LMC_CSR_WRITE (sc, csr_15, 0x00000011);
sc->lmc_cmdmode |= TULIP_CMD_TXRUN | TULIP_CMD_RXRUN;
LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
if (sc->lmc_ok == 0)
goto kick_timer;
LMC_EVENT_LOG(LMC_EVENT_WATCHDOG, LMC_CSR_READ (sc, csr_status), lmc_mii_readreg (sc, 0, 16));
/* --- begin time out check -----------------------------------
* check for a transmit interrupt timeout
* Has the packet xmt vs xmt serviced threshold been exceeded */
if (sc->lmc_taint_tx == sc->lastlmc_taint_tx &&
sc->lmc_device->stats.tx_packets > sc->lasttx_packets &&
sc->tx_TimeoutInd == 0)
{
/* wait for the watchdog to come around again */
sc->tx_TimeoutInd = 1;
}
else if (sc->lmc_taint_tx == sc->lastlmc_taint_tx &&
sc->lmc_device->stats.tx_packets > sc->lasttx_packets &&
sc->tx_TimeoutInd)
{
LMC_EVENT_LOG(LMC_EVENT_XMTINTTMO, LMC_CSR_READ (sc, csr_status), 0);
sc->tx_TimeoutDisplay = 1;
sc->extra_stats.tx_TimeoutCnt++;
/* DEC chip is stuck, hit it with a RESET!!!! */
lmc_running_reset (dev);
/* look at receive & transmit process state to make sure they are running */
LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
/* look at: DSR - 02 for Reg 16
* CTS - 08
* DCD - 10
* RI - 20
* for Reg 17
*/
LMC_EVENT_LOG(LMC_EVENT_RESET2, lmc_mii_readreg (sc, 0, 16), lmc_mii_readreg (sc, 0, 17));
/* reset the transmit timeout detection flag */
sc->tx_TimeoutInd = 0;
sc->lastlmc_taint_tx = sc->lmc_taint_tx;
sc->lasttx_packets = sc->lmc_device->stats.tx_packets;
} else {
sc->tx_TimeoutInd = 0;
sc->lastlmc_taint_tx = sc->lmc_taint_tx;
sc->lasttx_packets = sc->lmc_device->stats.tx_packets;
}
/* --- end time out check ----------------------------------- */
link_status = sc->lmc_media->get_link_status (sc);
/*
* hardware level link lost, but the interface is marked as up.
* Mark it as down.
*/
if ((link_status == 0) && (sc->last_link_status != 0)) {
printk(KERN_WARNING "%s: hardware/physical link down\n", dev->name);
sc->last_link_status = 0;
/* lmc_reset (sc); Why reset??? The link can go down ok */
/* Inform the world that link has been lost */
netif_carrier_off(dev);
}
/*
* hardware link is up, but the interface is marked as down.
* Bring it back up again.
*/
if (link_status != 0 && sc->last_link_status == 0) {
printk(KERN_WARNING "%s: hardware/physical link up\n", dev->name);
sc->last_link_status = 1;
/* lmc_reset (sc); Again why reset??? */
netif_carrier_on(dev);
}
/* Call media specific watchdog functions */
sc->lmc_media->watchdog(sc);
/*
* Poke the transmitter to make sure it
* never stops, even if we run out of mem
*/
LMC_CSR_WRITE(sc, csr_rxpoll, 0);
/*
* Check for code that failed
* and try and fix it as appropriate
*/
if(sc->failed_ring == 1){
/*
* Failed to setup the recv/xmit rin
* Try again
*/
sc->failed_ring = 0;
lmc_softreset(sc);
}
if(sc->failed_recv_alloc == 1){
/*
* We failed to alloc mem in the
* interrupt handler, go through the rings
* and rebuild them
*/
sc->failed_recv_alloc = 0;
lmc_softreset(sc);
}
/*
* remember the timer value
*/
kick_timer:
ticks = LMC_CSR_READ (sc, csr_gp_timer);
LMC_CSR_WRITE (sc, csr_gp_timer, 0xffffffffUL);
sc->ictl.ticks = 0x0000ffff - (ticks & 0x0000ffff);
/*
* restart this timer.
*/
sc->timer.expires = jiffies + (HZ);
add_timer (&sc->timer);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
lmc_trace(dev, "lmc_watchdog out");
}
static int lmc_attach(struct net_device *dev, unsigned short encoding,
unsigned short parity)
{
if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
return 0;
return -EINVAL;
}
static const struct net_device_ops lmc_ops = {
.ndo_open = lmc_open,
.ndo_stop = lmc_close,
.ndo_change_mtu = hdlc_change_mtu,
.ndo_start_xmit = hdlc_start_xmit,
.ndo_do_ioctl = lmc_ioctl,
.ndo_tx_timeout = lmc_driver_timeout,
.ndo_get_stats = lmc_get_stats,
};
static int __devinit lmc_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
lmc_softc_t *sc;
struct net_device *dev;
u16 subdevice;
u16 AdapModelNum;
int err;
static int cards_found;
/* lmc_trace(dev, "lmc_init_one in"); */
err = pci_enable_device(pdev);
if (err) {
printk(KERN_ERR "lmc: pci enable failed: %d\n", err);
return err;
}
err = pci_request_regions(pdev, "lmc");
if (err) {
printk(KERN_ERR "lmc: pci_request_region failed\n");
goto err_req_io;
}
/*
* Allocate our own device structure
*/
sc = kzalloc(sizeof(lmc_softc_t), GFP_KERNEL);
if (!sc) {
err = -ENOMEM;
goto err_kzalloc;
}
dev = alloc_hdlcdev(sc);
if (!dev) {
printk(KERN_ERR "lmc:alloc_netdev for device failed\n");
goto err_hdlcdev;
}
dev->type = ARPHRD_HDLC;
dev_to_hdlc(dev)->xmit = lmc_start_xmit;
dev_to_hdlc(dev)->attach = lmc_attach;
dev->netdev_ops = &lmc_ops;
dev->watchdog_timeo = HZ; /* 1 second */
dev->tx_queue_len = 100;
sc->lmc_device = dev;
sc->name = dev->name;
sc->if_type = LMC_PPP;
sc->check = 0xBEAFCAFE;
dev->base_addr = pci_resource_start(pdev, 0);
dev->irq = pdev->irq;
pci_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
/*
* This will get the protocol layer ready and do any 1 time init's
* Must have a valid sc and dev structure
*/
lmc_proto_attach(sc);
/* Init the spin lock so can call it latter */
spin_lock_init(&sc->lmc_lock);
pci_set_master(pdev);
printk(KERN_INFO "%s: detected at %lx, irq %d\n", dev->name,
dev->base_addr, dev->irq);
err = register_hdlc_device(dev);
if (err) {
printk(KERN_ERR "%s: register_netdev failed.\n", dev->name);
free_netdev(dev);
goto err_hdlcdev;
}
sc->lmc_cardtype = LMC_CARDTYPE_UNKNOWN;
sc->lmc_timing = LMC_CTL_CLOCK_SOURCE_EXT;
/*
*
* Check either the subvendor or the subdevice, some systems reverse
* the setting in the bois, seems to be version and arch dependent?
* Fix the error, exchange the two values
*/
if ((subdevice = pdev->subsystem_device) == PCI_VENDOR_ID_LMC)
subdevice = pdev->subsystem_vendor;
switch (subdevice) {
case PCI_DEVICE_ID_LMC_HSSI:
printk(KERN_INFO "%s: LMC HSSI\n", dev->name);
sc->lmc_cardtype = LMC_CARDTYPE_HSSI;
sc->lmc_media = &lmc_hssi_media;
break;
case PCI_DEVICE_ID_LMC_DS3:
printk(KERN_INFO "%s: LMC DS3\n", dev->name);
sc->lmc_cardtype = LMC_CARDTYPE_DS3;
sc->lmc_media = &lmc_ds3_media;
break;
case PCI_DEVICE_ID_LMC_SSI:
printk(KERN_INFO "%s: LMC SSI\n", dev->name);
sc->lmc_cardtype = LMC_CARDTYPE_SSI;
sc->lmc_media = &lmc_ssi_media;
break;
case PCI_DEVICE_ID_LMC_T1:
printk(KERN_INFO "%s: LMC T1\n", dev->name);
sc->lmc_cardtype = LMC_CARDTYPE_T1;
sc->lmc_media = &lmc_t1_media;
break;
default:
printk(KERN_WARNING "%s: LMC UNKNOWN CARD!\n", dev->name);
break;
}
lmc_initcsrs (sc, dev->base_addr, 8);
lmc_gpio_mkinput (sc, 0xff);
sc->lmc_gpio = 0; /* drive no signals yet */
sc->lmc_media->defaults (sc);
sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
/* verify that the PCI Sub System ID matches the Adapter Model number
* from the MII register
*/
AdapModelNum = (lmc_mii_readreg (sc, 0, 3) & 0x3f0) >> 4;
if ((AdapModelNum != LMC_ADAP_T1 || /* detect LMC1200 */
subdevice != PCI_DEVICE_ID_LMC_T1) &&
(AdapModelNum != LMC_ADAP_SSI || /* detect LMC1000 */
subdevice != PCI_DEVICE_ID_LMC_SSI) &&
(AdapModelNum != LMC_ADAP_DS3 || /* detect LMC5245 */
subdevice != PCI_DEVICE_ID_LMC_DS3) &&
(AdapModelNum != LMC_ADAP_HSSI || /* detect LMC5200 */
subdevice != PCI_DEVICE_ID_LMC_HSSI))
printk(KERN_WARNING "%s: Model number (%d) miscompare for PCI"
" Subsystem ID = 0x%04x\n",
dev->name, AdapModelNum, subdevice);
/*
* reset clock
*/
LMC_CSR_WRITE (sc, csr_gp_timer, 0xFFFFFFFFUL);
sc->board_idx = cards_found++;
sc->extra_stats.check = STATCHECK;
sc->extra_stats.version_size = (DRIVER_VERSION << 16) +
sizeof(sc->lmc_device->stats) + sizeof(sc->extra_stats);
sc->extra_stats.lmc_cardtype = sc->lmc_cardtype;
sc->lmc_ok = 0;
sc->last_link_status = 0;
lmc_trace(dev, "lmc_init_one out");
return 0;
err_hdlcdev:
pci_set_drvdata(pdev, NULL);
kfree(sc);
err_kzalloc:
pci_release_regions(pdev);
err_req_io:
pci_disable_device(pdev);
return err;
}
/*
* Called from pci when removing module.
*/
static void __devexit lmc_remove_one(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
if (dev) {
printk(KERN_DEBUG "%s: removing...\n", dev->name);
unregister_hdlc_device(dev);
free_netdev(dev);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
}
}
/* After this is called, packets can be sent.
* Does not initialize the addresses
*/
static int lmc_open(struct net_device *dev)
{
lmc_softc_t *sc = dev_to_sc(dev);
int err;
lmc_trace(dev, "lmc_open in");
lmc_led_on(sc, LMC_DS3_LED0);
lmc_dec_reset(sc);
lmc_reset(sc);
LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ(sc, csr_status), 0);
LMC_EVENT_LOG(LMC_EVENT_RESET2, lmc_mii_readreg(sc, 0, 16),
lmc_mii_readreg(sc, 0, 17));
if (sc->lmc_ok){
lmc_trace(dev, "lmc_open lmc_ok out");
return 0;
}
lmc_softreset (sc);
/* Since we have to use PCI bus, this should work on x86,alpha,ppc */
if (request_irq (dev->irq, lmc_interrupt, IRQF_SHARED, dev->name, dev)){
printk(KERN_WARNING "%s: could not get irq: %d\n", dev->name, dev->irq);
lmc_trace(dev, "lmc_open irq failed out");
return -EAGAIN;
}
sc->got_irq = 1;
/* Assert Terminal Active */
sc->lmc_miireg16 |= LMC_MII16_LED_ALL;
sc->lmc_media->set_link_status (sc, LMC_LINK_UP);
/*
* reset to last state.
*/
sc->lmc_media->set_status (sc, NULL);
/* setup default bits to be used in tulip_desc_t transmit descriptor
* -baz */
sc->TxDescriptControlInit = (
LMC_TDES_INTERRUPT_ON_COMPLETION
| LMC_TDES_FIRST_SEGMENT
| LMC_TDES_LAST_SEGMENT
| LMC_TDES_SECOND_ADDR_CHAINED
| LMC_TDES_DISABLE_PADDING
);
if (sc->ictl.crc_length == LMC_CTL_CRC_LENGTH_16) {
/* disable 32 bit CRC generated by ASIC */
sc->TxDescriptControlInit |= LMC_TDES_ADD_CRC_DISABLE;
}
sc->lmc_media->set_crc_length(sc, sc->ictl.crc_length);
/* Acknoledge the Terminal Active and light LEDs */
/* dev->flags |= IFF_UP; */
if ((err = lmc_proto_open(sc)) != 0)
return err;
netif_start_queue(dev);
sc->extra_stats.tx_tbusy0++;
/*
* select what interrupts we want to get
*/
sc->lmc_intrmask = 0;
/* Should be using the default interrupt mask defined in the .h file. */
sc->lmc_intrmask |= (TULIP_STS_NORMALINTR
| TULIP_STS_RXINTR
| TULIP_STS_TXINTR
| TULIP_STS_ABNRMLINTR
| TULIP_STS_SYSERROR
| TULIP_STS_TXSTOPPED
| TULIP_STS_TXUNDERFLOW
| TULIP_STS_RXSTOPPED
| TULIP_STS_RXNOBUF
);
LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
sc->lmc_cmdmode |= TULIP_CMD_TXRUN;
sc->lmc_cmdmode |= TULIP_CMD_RXRUN;
LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
sc->lmc_ok = 1; /* Run watchdog */
/*
* Set the if up now - pfb
*/
sc->last_link_status = 1;
/*
* Setup a timer for the watchdog on probe, and start it running.
* Since lmc_ok == 0, it will be a NOP for now.
*/
init_timer (&sc->timer);
sc->timer.expires = jiffies + HZ;
sc->timer.data = (unsigned long) dev;
sc->timer.function = lmc_watchdog;
add_timer (&sc->timer);
lmc_trace(dev, "lmc_open out");
return 0;
}
/* Total reset to compensate for the AdTran DSU doing bad things
* under heavy load
*/
static void lmc_running_reset (struct net_device *dev) /*fold00*/
{
lmc_softc_t *sc = dev_to_sc(dev);
lmc_trace(dev, "lmc_runnig_reset in");
/* stop interrupts */
/* Clear the interrupt mask */
LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
lmc_dec_reset (sc);
lmc_reset (sc);
lmc_softreset (sc);
/* sc->lmc_miireg16 |= LMC_MII16_LED_ALL; */
sc->lmc_media->set_link_status (sc, 1);
sc->lmc_media->set_status (sc, NULL);
netif_wake_queue(dev);
sc->lmc_txfull = 0;
sc->extra_stats.tx_tbusy0++;
sc->lmc_intrmask = TULIP_DEFAULT_INTR_MASK;
LMC_CSR_WRITE (sc, csr_intr, sc->lmc_intrmask);
sc->lmc_cmdmode |= (TULIP_CMD_TXRUN | TULIP_CMD_RXRUN);
LMC_CSR_WRITE (sc, csr_command, sc->lmc_cmdmode);
lmc_trace(dev, "lmc_runnin_reset_out");
}
/* This is what is called when you ifconfig down a device.
* This disables the timer for the watchdog and keepalives,
* and disables the irq for dev.
*/
static int lmc_close(struct net_device *dev)
{
/* not calling release_region() as we should */
lmc_softc_t *sc = dev_to_sc(dev);
lmc_trace(dev, "lmc_close in");
sc->lmc_ok = 0;
sc->lmc_media->set_link_status (sc, 0);
del_timer (&sc->timer);
lmc_proto_close(sc);
lmc_ifdown (dev);
lmc_trace(dev, "lmc_close out");
return 0;
}
/* Ends the transfer of packets */
/* When the interface goes down, this is called */
static int lmc_ifdown (struct net_device *dev) /*fold00*/
{
lmc_softc_t *sc = dev_to_sc(dev);
u32 csr6;
int i;
lmc_trace(dev, "lmc_ifdown in");
/* Don't let anything else go on right now */
// dev->start = 0;
netif_stop_queue(dev);
sc->extra_stats.tx_tbusy1++;
/* stop interrupts */
/* Clear the interrupt mask */
LMC_CSR_WRITE (sc, csr_intr, 0x00000000);
/* Stop Tx and Rx on the chip */
csr6 = LMC_CSR_READ (sc, csr_command);
csr6 &= ~LMC_DEC_ST; /* Turn off the Transmission bit */
csr6 &= ~LMC_DEC_SR; /* Turn off the Receive bit */
LMC_CSR_WRITE (sc, csr_command, csr6);
sc->lmc_device->stats.rx_missed_errors +=
LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
/* release the interrupt */
if(sc->got_irq == 1){
free_irq (dev->irq, dev);
sc->got_irq = 0;
}
/* free skbuffs in the Rx queue */
for (i = 0; i < LMC_RXDESCS; i++)
{
struct sk_buff *skb = sc->lmc_rxq[i];
sc->lmc_rxq[i] = NULL;
sc->lmc_rxring[i].status = 0;
sc->lmc_rxring[i].length = 0;
sc->lmc_rxring[i].buffer1 = 0xDEADBEEF;
if (skb != NULL)
dev_kfree_skb(skb);
sc->lmc_rxq[i] = NULL;
}
for (i = 0; i < LMC_TXDESCS; i++)
{
if (sc->lmc_txq[i] != NULL)
dev_kfree_skb(sc->lmc_txq[i]);
sc->lmc_txq[i] = NULL;
}
lmc_led_off (sc, LMC_MII16_LED_ALL);
netif_wake_queue(dev);
sc->extra_stats.tx_tbusy0++;
lmc_trace(dev, "lmc_ifdown out");
return 0;
}
/* Interrupt handling routine. This will take an incoming packet, or clean
* up after a trasmit.
*/
static irqreturn_t lmc_interrupt (int irq, void *dev_instance) /*fold00*/
{
struct net_device *dev = (struct net_device *) dev_instance;
lmc_softc_t *sc = dev_to_sc(dev);
u32 csr;
int i;
s32 stat;
unsigned int badtx;
u32 firstcsr;
int max_work = LMC_RXDESCS;
int handled = 0;
lmc_trace(dev, "lmc_interrupt in");
spin_lock(&sc->lmc_lock);
/*
* Read the csr to find what interrupts we have (if any)
*/
csr = LMC_CSR_READ (sc, csr_status);
/*
* Make sure this is our interrupt
*/
if ( ! (csr & sc->lmc_intrmask)) {
goto lmc_int_fail_out;
}
firstcsr = csr;
/* always go through this loop at least once */
while (csr & sc->lmc_intrmask) {
handled = 1;
/*
* Clear interrupt bits, we handle all case below
*/
LMC_CSR_WRITE (sc, csr_status, csr);
/*
* One of
* - Transmit process timed out CSR5<1>
* - Transmit jabber timeout CSR5<3>
* - Transmit underflow CSR5<5>
* - Transmit Receiver buffer unavailable CSR5<7>
* - Receive process stopped CSR5<8>
* - Receive watchdog timeout CSR5<9>
* - Early transmit interrupt CSR5<10>
*
* Is this really right? Should we do a running reset for jabber?
* (being a WAN card and all)
*/
if (csr & TULIP_STS_ABNRMLINTR){
lmc_running_reset (dev);
break;
}
if (csr & TULIP_STS_RXINTR){
lmc_trace(dev, "rx interrupt");
lmc_rx (dev);
}
if (csr & (TULIP_STS_TXINTR | TULIP_STS_TXNOBUF | TULIP_STS_TXSTOPPED)) {
int n_compl = 0 ;
/* reset the transmit timeout detection flag -baz */
sc->extra_stats.tx_NoCompleteCnt = 0;
badtx = sc->lmc_taint_tx;
i = badtx % LMC_TXDESCS;
while ((badtx < sc->lmc_next_tx)) {
stat = sc->lmc_txring[i].status;
LMC_EVENT_LOG (LMC_EVENT_XMTINT, stat,
sc->lmc_txring[i].length);
/*
* If bit 31 is 1 the tulip owns it break out of the loop
*/
if (stat & 0x80000000)
break;
n_compl++ ; /* i.e., have an empty slot in ring */
/*
* If we have no skbuff or have cleared it
* Already continue to the next buffer
*/
if (sc->lmc_txq[i] == NULL)
continue;
/*
* Check the total error summary to look for any errors
*/
if (stat & 0x8000) {
sc->lmc_device->stats.tx_errors++;
if (stat & 0x4104)
sc->lmc_device->stats.tx_aborted_errors++;
if (stat & 0x0C00)
sc->lmc_device->stats.tx_carrier_errors++;
if (stat & 0x0200)
sc->lmc_device->stats.tx_window_errors++;
if (stat & 0x0002)
sc->lmc_device->stats.tx_fifo_errors++;
} else {
sc->lmc_device->stats.tx_bytes += sc->lmc_txring[i].length & 0x7ff;
sc->lmc_device->stats.tx_packets++;
}
// dev_kfree_skb(sc->lmc_txq[i]);
dev_kfree_skb_irq(sc->lmc_txq[i]);
sc->lmc_txq[i] = NULL;
badtx++;
i = badtx % LMC_TXDESCS;
}
if (sc->lmc_next_tx - badtx > LMC_TXDESCS)
{
printk ("%s: out of sync pointer\n", dev->name);
badtx += LMC_TXDESCS;
}
LMC_EVENT_LOG(LMC_EVENT_TBUSY0, n_compl, 0);
sc->lmc_txfull = 0;
netif_wake_queue(dev);
sc->extra_stats.tx_tbusy0++;
#ifdef DEBUG
sc->extra_stats.dirtyTx = badtx;
sc->extra_stats.lmc_next_tx = sc->lmc_next_tx;
sc->extra_stats.lmc_txfull = sc->lmc_txfull;
#endif
sc->lmc_taint_tx = badtx;
/*
* Why was there a break here???
*/
} /* end handle transmit interrupt */
if (csr & TULIP_STS_SYSERROR) {
u32 error;
printk (KERN_WARNING "%s: system bus error csr: %#8.8x\n", dev->name, csr);
error = csr>>23 & 0x7;
switch(error){
case 0x000:
printk(KERN_WARNING "%s: Parity Fault (bad)\n", dev->name);
break;
case 0x001:
printk(KERN_WARNING "%s: Master Abort (naughty)\n", dev->name);
break;
case 0x010:
printk(KERN_WARNING "%s: Target Abort (not so naughty)\n", dev->name);
break;
default:
printk(KERN_WARNING "%s: This bus error code was supposed to be reserved!\n", dev->name);
}
lmc_dec_reset (sc);
lmc_reset (sc);
LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
LMC_EVENT_LOG(LMC_EVENT_RESET2,
lmc_mii_readreg (sc, 0, 16),
lmc_mii_readreg (sc, 0, 17));
}
if(max_work-- <= 0)
break;
/*
* Get current csr status to make sure
* we've cleared all interrupts
*/
csr = LMC_CSR_READ (sc, csr_status);
} /* end interrupt loop */
LMC_EVENT_LOG(LMC_EVENT_INT, firstcsr, csr);
lmc_int_fail_out:
spin_unlock(&sc->lmc_lock);
lmc_trace(dev, "lmc_interrupt out");
return IRQ_RETVAL(handled);
}
static netdev_tx_t lmc_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
lmc_softc_t *sc = dev_to_sc(dev);
u32 flag;
int entry;
unsigned long flags;
lmc_trace(dev, "lmc_start_xmit in");
spin_lock_irqsave(&sc->lmc_lock, flags);
/* normal path, tbusy known to be zero */
entry = sc->lmc_next_tx % LMC_TXDESCS;
sc->lmc_txq[entry] = skb;
sc->lmc_txring[entry].buffer1 = virt_to_bus (skb->data);
LMC_CONSOLE_LOG("xmit", skb->data, skb->len);
#ifndef GCOM
/* If the queue is less than half full, don't interrupt */
if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS / 2)
{
/* Do not interrupt on completion of this packet */
flag = 0x60000000;
netif_wake_queue(dev);
}
else if (sc->lmc_next_tx - sc->lmc_taint_tx == LMC_TXDESCS / 2)
{
/* This generates an interrupt on completion of this packet */
flag = 0xe0000000;
netif_wake_queue(dev);
}
else if (sc->lmc_next_tx - sc->lmc_taint_tx < LMC_TXDESCS - 1)
{
/* Do not interrupt on completion of this packet */
flag = 0x60000000;
netif_wake_queue(dev);
}
else
{
/* This generates an interrupt on completion of this packet */
flag = 0xe0000000;
sc->lmc_txfull = 1;
netif_stop_queue(dev);
}
#else
flag = LMC_TDES_INTERRUPT_ON_COMPLETION;
if (sc->lmc_next_tx - sc->lmc_taint_tx >= LMC_TXDESCS - 1)
{ /* ring full, go busy */
sc->lmc_txfull = 1;
netif_stop_queue(dev);
sc->extra_stats.tx_tbusy1++;
LMC_EVENT_LOG(LMC_EVENT_TBUSY1, entry, 0);
}
#endif
if (entry == LMC_TXDESCS - 1) /* last descriptor in ring */
flag |= LMC_TDES_END_OF_RING; /* flag as such for Tulip */
/* don't pad small packets either */
flag = sc->lmc_txring[entry].length = (skb->len) | flag |
sc->TxDescriptControlInit;
/* set the transmit timeout flag to be checked in
* the watchdog timer handler. -baz
*/
sc->extra_stats.tx_NoCompleteCnt++;
sc->lmc_next_tx++;
/* give ownership to the chip */
LMC_EVENT_LOG(LMC_EVENT_XMT, flag, entry);
sc->lmc_txring[entry].status = 0x80000000;
/* send now! */
LMC_CSR_WRITE (sc, csr_txpoll, 0);
spin_unlock_irqrestore(&sc->lmc_lock, flags);
lmc_trace(dev, "lmc_start_xmit_out");
return NETDEV_TX_OK;
}
static int lmc_rx(struct net_device *dev)
{
lmc_softc_t *sc = dev_to_sc(dev);
int i;
int rx_work_limit = LMC_RXDESCS;
unsigned int next_rx;
int rxIntLoopCnt; /* debug -baz */
int localLengthErrCnt = 0;
long stat;
struct sk_buff *skb, *nsb;
u16 len;
lmc_trace(dev, "lmc_rx in");
lmc_led_on(sc, LMC_DS3_LED3);
rxIntLoopCnt = 0; /* debug -baz */
i = sc->lmc_next_rx % LMC_RXDESCS;
next_rx = sc->lmc_next_rx;
while (((stat = sc->lmc_rxring[i].status) & LMC_RDES_OWN_BIT) != DESC_OWNED_BY_DC21X4)
{
rxIntLoopCnt++; /* debug -baz */
len = ((stat & LMC_RDES_FRAME_LENGTH) >> RDES_FRAME_LENGTH_BIT_NUMBER);
if ((stat & 0x0300) != 0x0300) { /* Check first segment and last segment */
if ((stat & 0x0000ffff) != 0x7fff) {
/* Oversized frame */
sc->lmc_device->stats.rx_length_errors++;
goto skip_packet;
}
}
if (stat & 0x00000008) { /* Catch a dribbling bit error */
sc->lmc_device->stats.rx_errors++;
sc->lmc_device->stats.rx_frame_errors++;
goto skip_packet;
}
if (stat & 0x00000004) { /* Catch a CRC error by the Xilinx */
sc->lmc_device->stats.rx_errors++;
sc->lmc_device->stats.rx_crc_errors++;
goto skip_packet;
}
if (len > LMC_PKT_BUF_SZ) {
sc->lmc_device->stats.rx_length_errors++;
localLengthErrCnt++;
goto skip_packet;
}
if (len < sc->lmc_crcSize + 2) {
sc->lmc_device->stats.rx_length_errors++;
sc->extra_stats.rx_SmallPktCnt++;
localLengthErrCnt++;
goto skip_packet;
}
if(stat & 0x00004000){
printk(KERN_WARNING "%s: Receiver descriptor error, receiver out of sync?\n", dev->name);
}
len -= sc->lmc_crcSize;
skb = sc->lmc_rxq[i];
/*
* We ran out of memory at some point
* just allocate an skb buff and continue.
*/
if (!skb) {
nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
if (nsb) {
sc->lmc_rxq[i] = nsb;
nsb->dev = dev;
sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
}
sc->failed_recv_alloc = 1;
goto skip_packet;
}
sc->lmc_device->stats.rx_packets++;
sc->lmc_device->stats.rx_bytes += len;
LMC_CONSOLE_LOG("recv", skb->data, len);
/*
* I'm not sure of the sanity of this
* Packets could be arriving at a constant
* 44.210mbits/sec and we're going to copy
* them into a new buffer??
*/
if(len > (LMC_MTU - (LMC_MTU>>2))){ /* len > LMC_MTU * 0.75 */
/*
* If it's a large packet don't copy it just hand it up
*/
give_it_anyways:
sc->lmc_rxq[i] = NULL;
sc->lmc_rxring[i].buffer1 = 0x0;
skb_put (skb, len);
skb->protocol = lmc_proto_type(sc, skb);
skb_reset_mac_header(skb);
/* skb_reset_network_header(skb); */
skb->dev = dev;
lmc_proto_netif(sc, skb);
/*
* This skb will be destroyed by the upper layers, make a new one
*/
nsb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
if (nsb) {
sc->lmc_rxq[i] = nsb;
nsb->dev = dev;
sc->lmc_rxring[i].buffer1 = virt_to_bus(skb_tail_pointer(nsb));
/* Transferred to 21140 below */
}
else {
/*
* We've run out of memory, stop trying to allocate
* memory and exit the interrupt handler
*
* The chip may run out of receivers and stop
* in which care we'll try to allocate the buffer
* again. (once a second)
*/
sc->extra_stats.rx_BuffAllocErr++;
LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
sc->failed_recv_alloc = 1;
goto skip_out_of_mem;
}
}
else {
nsb = dev_alloc_skb(len);
if(!nsb) {
goto give_it_anyways;
}
skb_copy_from_linear_data(skb, skb_put(nsb, len), len);
nsb->protocol = lmc_proto_type(sc, nsb);
skb_reset_mac_header(nsb);
/* skb_reset_network_header(nsb); */
nsb->dev = dev;
lmc_proto_netif(sc, nsb);
}
skip_packet:
LMC_EVENT_LOG(LMC_EVENT_RCVINT, stat, len);
sc->lmc_rxring[i].status = DESC_OWNED_BY_DC21X4;
sc->lmc_next_rx++;
i = sc->lmc_next_rx % LMC_RXDESCS;
rx_work_limit--;
if (rx_work_limit < 0)
break;
}
/* detect condition for LMC1000 where DSU cable attaches and fills
* descriptors with bogus packets
*
if (localLengthErrCnt > LMC_RXDESCS - 3) {
sc->extra_stats.rx_BadPktSurgeCnt++;
LMC_EVENT_LOG(LMC_EVENT_BADPKTSURGE, localLengthErrCnt,
sc->extra_stats.rx_BadPktSurgeCnt);
} */
/* save max count of receive descriptors serviced */
if (rxIntLoopCnt > sc->extra_stats.rxIntLoopCnt)
sc->extra_stats.rxIntLoopCnt = rxIntLoopCnt; /* debug -baz */
#ifdef DEBUG
if (rxIntLoopCnt == 0)
{
for (i = 0; i < LMC_RXDESCS; i++)
{
if ((sc->lmc_rxring[i].status & LMC_RDES_OWN_BIT)
!= DESC_OWNED_BY_DC21X4)
{
rxIntLoopCnt++;
}
}
LMC_EVENT_LOG(LMC_EVENT_RCVEND, rxIntLoopCnt, 0);
}
#endif
lmc_led_off(sc, LMC_DS3_LED3);
skip_out_of_mem:
lmc_trace(dev, "lmc_rx out");
return 0;
}
static struct net_device_stats *lmc_get_stats(struct net_device *dev)
{
lmc_softc_t *sc = dev_to_sc(dev);
unsigned long flags;
lmc_trace(dev, "lmc_get_stats in");
spin_lock_irqsave(&sc->lmc_lock, flags);
sc->lmc_device->stats.rx_missed_errors += LMC_CSR_READ(sc, csr_missed_frames) & 0xffff;
spin_unlock_irqrestore(&sc->lmc_lock, flags);
lmc_trace(dev, "lmc_get_stats out");
return &sc->lmc_device->stats;
}
static struct pci_driver lmc_driver = {
.name = "lmc",
.id_table = lmc_pci_tbl,
.probe = lmc_init_one,
.remove = __devexit_p(lmc_remove_one),
};
static int __init init_lmc(void)
{
return pci_register_driver(&lmc_driver);
}
static void __exit exit_lmc(void)
{
pci_unregister_driver(&lmc_driver);
}
module_init(init_lmc);
module_exit(exit_lmc);
unsigned lmc_mii_readreg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno) /*fold00*/
{
int i;
int command = (0xf6 << 10) | (devaddr << 5) | regno;
int retval = 0;
lmc_trace(sc->lmc_device, "lmc_mii_readreg in");
LMC_MII_SYNC (sc);
lmc_trace(sc->lmc_device, "lmc_mii_readreg: done sync");
for (i = 15; i >= 0; i--)
{
int dataval = (command & (1 << i)) ? 0x20000 : 0;
LMC_CSR_WRITE (sc, csr_9, dataval);
lmc_delay ();
/* __SLOW_DOWN_IO; */
LMC_CSR_WRITE (sc, csr_9, dataval | 0x10000);
lmc_delay ();
/* __SLOW_DOWN_IO; */
}
lmc_trace(sc->lmc_device, "lmc_mii_readreg: done1");
for (i = 19; i > 0; i--)
{
LMC_CSR_WRITE (sc, csr_9, 0x40000);
lmc_delay ();
/* __SLOW_DOWN_IO; */
retval = (retval << 1) | ((LMC_CSR_READ (sc, csr_9) & 0x80000) ? 1 : 0);
LMC_CSR_WRITE (sc, csr_9, 0x40000 | 0x10000);
lmc_delay ();
/* __SLOW_DOWN_IO; */
}
lmc_trace(sc->lmc_device, "lmc_mii_readreg out");
return (retval >> 1) & 0xffff;
}
void lmc_mii_writereg (lmc_softc_t * const sc, unsigned devaddr, unsigned regno, unsigned data) /*fold00*/
{
int i = 32;
int command = (0x5002 << 16) | (devaddr << 23) | (regno << 18) | data;
lmc_trace(sc->lmc_device, "lmc_mii_writereg in");
LMC_MII_SYNC (sc);
i = 31;
while (i >= 0)
{
int datav;
if (command & (1 << i))
datav = 0x20000;
else
datav = 0x00000;
LMC_CSR_WRITE (sc, csr_9, datav);
lmc_delay ();
/* __SLOW_DOWN_IO; */
LMC_CSR_WRITE (sc, csr_9, (datav | 0x10000));
lmc_delay ();
/* __SLOW_DOWN_IO; */
i--;
}
i = 2;
while (i > 0)
{
LMC_CSR_WRITE (sc, csr_9, 0x40000);
lmc_delay ();
/* __SLOW_DOWN_IO; */
LMC_CSR_WRITE (sc, csr_9, 0x50000);
lmc_delay ();
/* __SLOW_DOWN_IO; */
i--;
}
lmc_trace(sc->lmc_device, "lmc_mii_writereg out");
}
static void lmc_softreset (lmc_softc_t * const sc) /*fold00*/
{
int i;
lmc_trace(sc->lmc_device, "lmc_softreset in");
/* Initialize the receive rings and buffers. */
sc->lmc_txfull = 0;
sc->lmc_next_rx = 0;
sc->lmc_next_tx = 0;
sc->lmc_taint_rx = 0;
sc->lmc_taint_tx = 0;
/*
* Setup each one of the receiver buffers
* allocate an skbuff for each one, setup the descriptor table
* and point each buffer at the next one
*/
for (i = 0; i < LMC_RXDESCS; i++)
{
struct sk_buff *skb;
if (sc->lmc_rxq[i] == NULL)
{
skb = dev_alloc_skb (LMC_PKT_BUF_SZ + 2);
if(skb == NULL){
printk(KERN_WARNING "%s: Failed to allocate receiver ring, will try again\n", sc->name);
sc->failed_ring = 1;
break;
}
else{
sc->lmc_rxq[i] = skb;
}
}
else
{
skb = sc->lmc_rxq[i];
}
skb->dev = sc->lmc_device;
/* owned by 21140 */
sc->lmc_rxring[i].status = 0x80000000;
/* used to be PKT_BUF_SZ now uses skb since we lose some to head room */
sc->lmc_rxring[i].length = skb_tailroom(skb);
/* use to be tail which is dumb since you're thinking why write
* to the end of the packj,et but since there's nothing there tail == data
*/
sc->lmc_rxring[i].buffer1 = virt_to_bus (skb->data);
/* This is fair since the structure is static and we have the next address */
sc->lmc_rxring[i].buffer2 = virt_to_bus (&sc->lmc_rxring[i + 1]);
}
/*
* Sets end of ring
*/
if (i != 0) {
sc->lmc_rxring[i - 1].length |= 0x02000000; /* Set end of buffers flag */
sc->lmc_rxring[i - 1].buffer2 = virt_to_bus(&sc->lmc_rxring[0]); /* Point back to the start */
}
LMC_CSR_WRITE (sc, csr_rxlist, virt_to_bus (sc->lmc_rxring)); /* write base address */
/* Initialize the transmit rings and buffers */
for (i = 0; i < LMC_TXDESCS; i++)
{
if (sc->lmc_txq[i] != NULL){ /* have buffer */
dev_kfree_skb(sc->lmc_txq[i]); /* free it */
sc->lmc_device->stats.tx_dropped++; /* We just dropped a packet */
}
sc->lmc_txq[i] = NULL;
sc->lmc_txring[i].status = 0x00000000;
sc->lmc_txring[i].buffer2 = virt_to_bus (&sc->lmc_txring[i + 1]);
}
sc->lmc_txring[i - 1].buffer2 = virt_to_bus (&sc->lmc_txring[0]);
LMC_CSR_WRITE (sc, csr_txlist, virt_to_bus (sc->lmc_txring));
lmc_trace(sc->lmc_device, "lmc_softreset out");
}
void lmc_gpio_mkinput(lmc_softc_t * const sc, u32 bits) /*fold00*/
{
lmc_trace(sc->lmc_device, "lmc_gpio_mkinput in");
sc->lmc_gpio_io &= ~bits;
LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
lmc_trace(sc->lmc_device, "lmc_gpio_mkinput out");
}
void lmc_gpio_mkoutput(lmc_softc_t * const sc, u32 bits) /*fold00*/
{
lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput in");
sc->lmc_gpio_io |= bits;
LMC_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET | (sc->lmc_gpio_io));
lmc_trace(sc->lmc_device, "lmc_gpio_mkoutput out");
}
void lmc_led_on(lmc_softc_t * const sc, u32 led) /*fold00*/
{
lmc_trace(sc->lmc_device, "lmc_led_on in");
if((~sc->lmc_miireg16) & led){ /* Already on! */
lmc_trace(sc->lmc_device, "lmc_led_on aon out");
return;
}
sc->lmc_miireg16 &= ~led;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
lmc_trace(sc->lmc_device, "lmc_led_on out");
}
void lmc_led_off(lmc_softc_t * const sc, u32 led) /*fold00*/
{
lmc_trace(sc->lmc_device, "lmc_led_off in");
if(sc->lmc_miireg16 & led){ /* Already set don't do anything */
lmc_trace(sc->lmc_device, "lmc_led_off aoff out");
return;
}
sc->lmc_miireg16 |= led;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
lmc_trace(sc->lmc_device, "lmc_led_off out");
}
static void lmc_reset(lmc_softc_t * const sc) /*fold00*/
{
lmc_trace(sc->lmc_device, "lmc_reset in");
sc->lmc_miireg16 |= LMC_MII16_FIFO_RESET;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
sc->lmc_miireg16 &= ~LMC_MII16_FIFO_RESET;
lmc_mii_writereg(sc, 0, 16, sc->lmc_miireg16);
/*
* make some of the GPIO pins be outputs
*/
lmc_gpio_mkoutput(sc, LMC_GEP_RESET);
/*
* RESET low to force state reset. This also forces
* the transmitter clock to be internal, but we expect to reset
* that later anyway.
*/
sc->lmc_gpio &= ~(LMC_GEP_RESET);
LMC_CSR_WRITE(sc, csr_gp, sc->lmc_gpio);
/*
* hold for more than 10 microseconds
*/
udelay(50);
/*
* stop driving Xilinx-related signals
*/
lmc_gpio_mkinput(sc, LMC_GEP_RESET);
/*
* Call media specific init routine
*/
sc->lmc_media->init(sc);
sc->extra_stats.resetCount++;
lmc_trace(sc->lmc_device, "lmc_reset out");
}
static void lmc_dec_reset(lmc_softc_t * const sc) /*fold00*/
{
u32 val;
lmc_trace(sc->lmc_device, "lmc_dec_reset in");
/*
* disable all interrupts
*/
sc->lmc_intrmask = 0;
LMC_CSR_WRITE(sc, csr_intr, sc->lmc_intrmask);
/*
* Reset the chip with a software reset command.
* Wait 10 microseconds (actually 50 PCI cycles but at
* 33MHz that comes to two microseconds but wait a
* bit longer anyways)
*/
LMC_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
udelay(25);
#ifdef __sparc__
sc->lmc_busmode = LMC_CSR_READ(sc, csr_busmode);
sc->lmc_busmode = 0x00100000;
sc->lmc_busmode &= ~TULIP_BUSMODE_SWRESET;
LMC_CSR_WRITE(sc, csr_busmode, sc->lmc_busmode);
#endif
sc->lmc_cmdmode = LMC_CSR_READ(sc, csr_command);
/*
* We want:
* no ethernet address in frames we write
* disable padding (txdesc, padding disable)
* ignore runt frames (rdes0 bit 15)
* no receiver watchdog or transmitter jabber timer
* (csr15 bit 0,14 == 1)
* if using 16-bit CRC, turn off CRC (trans desc, crc disable)
*/
sc->lmc_cmdmode |= ( TULIP_CMD_PROMISCUOUS
| TULIP_CMD_FULLDUPLEX
| TULIP_CMD_PASSBADPKT
| TULIP_CMD_NOHEARTBEAT
| TULIP_CMD_PORTSELECT
| TULIP_CMD_RECEIVEALL
| TULIP_CMD_MUSTBEONE
);
sc->lmc_cmdmode &= ~( TULIP_CMD_OPERMODE
| TULIP_CMD_THRESHOLDCTL
| TULIP_CMD_STOREFWD
| TULIP_CMD_TXTHRSHLDCTL
);
LMC_CSR_WRITE(sc, csr_command, sc->lmc_cmdmode);
/*
* disable receiver watchdog and transmit jabber
*/
val = LMC_CSR_READ(sc, csr_sia_general);
val |= (TULIP_WATCHDOG_TXDISABLE | TULIP_WATCHDOG_RXDISABLE);
LMC_CSR_WRITE(sc, csr_sia_general, val);
lmc_trace(sc->lmc_device, "lmc_dec_reset out");
}
static void lmc_initcsrs(lmc_softc_t * const sc, lmc_csrptr_t csr_base, /*fold00*/
size_t csr_size)
{
lmc_trace(sc->lmc_device, "lmc_initcsrs in");
sc->lmc_csrs.csr_busmode = csr_base + 0 * csr_size;
sc->lmc_csrs.csr_txpoll = csr_base + 1 * csr_size;
sc->lmc_csrs.csr_rxpoll = csr_base + 2 * csr_size;
sc->lmc_csrs.csr_rxlist = csr_base + 3 * csr_size;
sc->lmc_csrs.csr_txlist = csr_base + 4 * csr_size;
sc->lmc_csrs.csr_status = csr_base + 5 * csr_size;
sc->lmc_csrs.csr_command = csr_base + 6 * csr_size;
sc->lmc_csrs.csr_intr = csr_base + 7 * csr_size;
sc->lmc_csrs.csr_missed_frames = csr_base + 8 * csr_size;
sc->lmc_csrs.csr_9 = csr_base + 9 * csr_size;
sc->lmc_csrs.csr_10 = csr_base + 10 * csr_size;
sc->lmc_csrs.csr_11 = csr_base + 11 * csr_size;
sc->lmc_csrs.csr_12 = csr_base + 12 * csr_size;
sc->lmc_csrs.csr_13 = csr_base + 13 * csr_size;
sc->lmc_csrs.csr_14 = csr_base + 14 * csr_size;
sc->lmc_csrs.csr_15 = csr_base + 15 * csr_size;
lmc_trace(sc->lmc_device, "lmc_initcsrs out");
}
static void lmc_driver_timeout(struct net_device *dev)
{
lmc_softc_t *sc = dev_to_sc(dev);
u32 csr6;
unsigned long flags;
lmc_trace(dev, "lmc_driver_timeout in");
spin_lock_irqsave(&sc->lmc_lock, flags);
printk("%s: Xmitter busy|\n", dev->name);
sc->extra_stats.tx_tbusy_calls++;
if (jiffies - dev_trans_start(dev) < TX_TIMEOUT)
goto bug_out;
/*
* Chip seems to have locked up
* Reset it
* This whips out all our decriptor
* table and starts from scartch
*/
LMC_EVENT_LOG(LMC_EVENT_XMTPRCTMO,
LMC_CSR_READ (sc, csr_status),
sc->extra_stats.tx_ProcTimeout);
lmc_running_reset (dev);
LMC_EVENT_LOG(LMC_EVENT_RESET1, LMC_CSR_READ (sc, csr_status), 0);
LMC_EVENT_LOG(LMC_EVENT_RESET2,
lmc_mii_readreg (sc, 0, 16),
lmc_mii_readreg (sc, 0, 17));
/* restart the tx processes */
csr6 = LMC_CSR_READ (sc, csr_command);
LMC_CSR_WRITE (sc, csr_command, csr6 | 0x0002);
LMC_CSR_WRITE (sc, csr_command, csr6 | 0x2002);
/* immediate transmit */
LMC_CSR_WRITE (sc, csr_txpoll, 0);
sc->lmc_device->stats.tx_errors++;
sc->extra_stats.tx_ProcTimeout++; /* -baz */
dev->trans_start = jiffies; /* prevent tx timeout */
bug_out:
spin_unlock_irqrestore(&sc->lmc_lock, flags);
lmc_trace(dev, "lmc_driver_timout out");
}
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