![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
1428 lines
35 KiB
C
1428 lines
35 KiB
C
/* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */
|
||
/* PLIP: A parallel port "network" driver for Linux. */
|
||
/* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */
|
||
/*
|
||
* Authors: Donald Becker <becker@scyld.com>
|
||
* Tommy Thorn <thorn@daimi.aau.dk>
|
||
* Tanabe Hiroyasu <hiro@sanpo.t.u-tokyo.ac.jp>
|
||
* Alan Cox <gw4pts@gw4pts.ampr.org>
|
||
* Peter Bauer <100136.3530@compuserve.com>
|
||
* Niibe Yutaka <gniibe@mri.co.jp>
|
||
* Nimrod Zimerman <zimerman@mailandnews.com>
|
||
*
|
||
* Enhancements:
|
||
* Modularization and ifreq/ifmap support by Alan Cox.
|
||
* Rewritten by Niibe Yutaka.
|
||
* parport-sharing awareness code by Philip Blundell.
|
||
* SMP locking by Niibe Yutaka.
|
||
* Support for parallel ports with no IRQ (poll mode),
|
||
* Modifications to use the parallel port API
|
||
* by Nimrod Zimerman.
|
||
*
|
||
* Fixes:
|
||
* Niibe Yutaka
|
||
* - Module initialization.
|
||
* - MTU fix.
|
||
* - Make sure other end is OK, before sending a packet.
|
||
* - Fix immediate timer problem.
|
||
*
|
||
* Al Viro
|
||
* - Changed {enable,disable}_irq handling to make it work
|
||
* with new ("stack") semantics.
|
||
*
|
||
* This program is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU General Public License
|
||
* as published by the Free Software Foundation; either version
|
||
* 2 of the License, or (at your option) any later version.
|
||
*/
|
||
|
||
/*
|
||
* Original version and the name 'PLIP' from Donald Becker <becker@scyld.com>
|
||
* inspired by Russ Nelson's parallel port packet driver.
|
||
*
|
||
* NOTE:
|
||
* Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0.
|
||
* Because of the necessity to communicate to DOS machines with the
|
||
* Crynwr packet driver, Peter Bauer changed the protocol again
|
||
* back to original protocol.
|
||
*
|
||
* This version follows original PLIP protocol.
|
||
* So, this PLIP can't communicate the PLIP of Linux v1.0.
|
||
*/
|
||
|
||
/*
|
||
* To use with DOS box, please do (Turn on ARP switch):
|
||
* # ifconfig plip[0-2] arp
|
||
*/
|
||
static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n";
|
||
|
||
/*
|
||
Sources:
|
||
Ideas and protocols came from Russ Nelson's <nelson@crynwr.com>
|
||
"parallel.asm" parallel port packet driver.
|
||
|
||
The "Crynwr" parallel port standard specifies the following protocol:
|
||
Trigger by sending nibble '0x8' (this causes interrupt on other end)
|
||
count-low octet
|
||
count-high octet
|
||
... data octets
|
||
checksum octet
|
||
Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)>
|
||
<wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)>
|
||
|
||
The packet is encapsulated as if it were ethernet.
|
||
|
||
The cable used is a de facto standard parallel null cable -- sold as
|
||
a "LapLink" cable by various places. You'll need a 12-conductor cable to
|
||
make one yourself. The wiring is:
|
||
SLCTIN 17 - 17
|
||
GROUND 25 - 25
|
||
D0->ERROR 2 - 15 15 - 2
|
||
D1->SLCT 3 - 13 13 - 3
|
||
D2->PAPOUT 4 - 12 12 - 4
|
||
D3->ACK 5 - 10 10 - 5
|
||
D4->BUSY 6 - 11 11 - 6
|
||
Do not connect the other pins. They are
|
||
D5,D6,D7 are 7,8,9
|
||
STROBE is 1, FEED is 14, INIT is 16
|
||
extra grounds are 18,19,20,21,22,23,24
|
||
*/
|
||
|
||
#include <linux/module.h>
|
||
#include <linux/kernel.h>
|
||
#include <linux/types.h>
|
||
#include <linux/fcntl.h>
|
||
#include <linux/interrupt.h>
|
||
#include <linux/string.h>
|
||
#include <linux/if_ether.h>
|
||
#include <linux/in.h>
|
||
#include <linux/errno.h>
|
||
#include <linux/delay.h>
|
||
#include <linux/lp.h>
|
||
#include <linux/init.h>
|
||
#include <linux/netdevice.h>
|
||
#include <linux/etherdevice.h>
|
||
#include <linux/inetdevice.h>
|
||
#include <linux/skbuff.h>
|
||
#include <linux/if_plip.h>
|
||
#include <linux/workqueue.h>
|
||
#include <linux/ioport.h>
|
||
#include <linux/spinlock.h>
|
||
#include <linux/parport.h>
|
||
#include <linux/bitops.h>
|
||
|
||
#include <net/neighbour.h>
|
||
|
||
#include <asm/system.h>
|
||
#include <asm/irq.h>
|
||
#include <asm/byteorder.h>
|
||
#include <asm/semaphore.h>
|
||
|
||
/* Maximum number of devices to support. */
|
||
#define PLIP_MAX 8
|
||
|
||
/* Use 0 for production, 1 for verification, >2 for debug */
|
||
#ifndef NET_DEBUG
|
||
#define NET_DEBUG 1
|
||
#endif
|
||
static unsigned int net_debug = NET_DEBUG;
|
||
|
||
#define ENABLE(irq) if (irq != -1) enable_irq(irq)
|
||
#define DISABLE(irq) if (irq != -1) disable_irq(irq)
|
||
|
||
/* In micro second */
|
||
#define PLIP_DELAY_UNIT 1
|
||
|
||
/* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */
|
||
#define PLIP_TRIGGER_WAIT 500
|
||
|
||
/* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */
|
||
#define PLIP_NIBBLE_WAIT 3000
|
||
|
||
/* Bottom halves */
|
||
static void plip_kick_bh(struct net_device *dev);
|
||
static void plip_bh(struct net_device *dev);
|
||
static void plip_timer_bh(struct net_device *dev);
|
||
|
||
/* Interrupt handler */
|
||
static void plip_interrupt(int irq, void *dev_id, struct pt_regs *regs);
|
||
|
||
/* Functions for DEV methods */
|
||
static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev);
|
||
static int plip_hard_header(struct sk_buff *skb, struct net_device *dev,
|
||
unsigned short type, void *daddr,
|
||
void *saddr, unsigned len);
|
||
static int plip_hard_header_cache(struct neighbour *neigh,
|
||
struct hh_cache *hh);
|
||
static int plip_open(struct net_device *dev);
|
||
static int plip_close(struct net_device *dev);
|
||
static struct net_device_stats *plip_get_stats(struct net_device *dev);
|
||
static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
|
||
static int plip_preempt(void *handle);
|
||
static void plip_wakeup(void *handle);
|
||
|
||
enum plip_connection_state {
|
||
PLIP_CN_NONE=0,
|
||
PLIP_CN_RECEIVE,
|
||
PLIP_CN_SEND,
|
||
PLIP_CN_CLOSING,
|
||
PLIP_CN_ERROR
|
||
};
|
||
|
||
enum plip_packet_state {
|
||
PLIP_PK_DONE=0,
|
||
PLIP_PK_TRIGGER,
|
||
PLIP_PK_LENGTH_LSB,
|
||
PLIP_PK_LENGTH_MSB,
|
||
PLIP_PK_DATA,
|
||
PLIP_PK_CHECKSUM
|
||
};
|
||
|
||
enum plip_nibble_state {
|
||
PLIP_NB_BEGIN,
|
||
PLIP_NB_1,
|
||
PLIP_NB_2,
|
||
};
|
||
|
||
struct plip_local {
|
||
enum plip_packet_state state;
|
||
enum plip_nibble_state nibble;
|
||
union {
|
||
struct {
|
||
#if defined(__LITTLE_ENDIAN)
|
||
unsigned char lsb;
|
||
unsigned char msb;
|
||
#elif defined(__BIG_ENDIAN)
|
||
unsigned char msb;
|
||
unsigned char lsb;
|
||
#else
|
||
#error "Please fix the endianness defines in <asm/byteorder.h>"
|
||
#endif
|
||
} b;
|
||
unsigned short h;
|
||
} length;
|
||
unsigned short byte;
|
||
unsigned char checksum;
|
||
unsigned char data;
|
||
struct sk_buff *skb;
|
||
};
|
||
|
||
struct net_local {
|
||
struct net_device_stats enet_stats;
|
||
struct work_struct immediate;
|
||
struct work_struct deferred;
|
||
struct work_struct timer;
|
||
struct plip_local snd_data;
|
||
struct plip_local rcv_data;
|
||
struct pardevice *pardev;
|
||
unsigned long trigger;
|
||
unsigned long nibble;
|
||
enum plip_connection_state connection;
|
||
unsigned short timeout_count;
|
||
int is_deferred;
|
||
int port_owner;
|
||
int should_relinquish;
|
||
int (*orig_hard_header)(struct sk_buff *skb, struct net_device *dev,
|
||
unsigned short type, void *daddr,
|
||
void *saddr, unsigned len);
|
||
int (*orig_hard_header_cache)(struct neighbour *neigh,
|
||
struct hh_cache *hh);
|
||
spinlock_t lock;
|
||
atomic_t kill_timer;
|
||
struct semaphore killed_timer_sem;
|
||
};
|
||
|
||
inline static void enable_parport_interrupts (struct net_device *dev)
|
||
{
|
||
if (dev->irq != -1)
|
||
{
|
||
struct parport *port =
|
||
((struct net_local *)dev->priv)->pardev->port;
|
||
port->ops->enable_irq (port);
|
||
}
|
||
}
|
||
|
||
inline static void disable_parport_interrupts (struct net_device *dev)
|
||
{
|
||
if (dev->irq != -1)
|
||
{
|
||
struct parport *port =
|
||
((struct net_local *)dev->priv)->pardev->port;
|
||
port->ops->disable_irq (port);
|
||
}
|
||
}
|
||
|
||
inline static void write_data (struct net_device *dev, unsigned char data)
|
||
{
|
||
struct parport *port =
|
||
((struct net_local *)dev->priv)->pardev->port;
|
||
|
||
port->ops->write_data (port, data);
|
||
}
|
||
|
||
inline static unsigned char read_status (struct net_device *dev)
|
||
{
|
||
struct parport *port =
|
||
((struct net_local *)dev->priv)->pardev->port;
|
||
|
||
return port->ops->read_status (port);
|
||
}
|
||
|
||
/* Entry point of PLIP driver.
|
||
Probe the hardware, and register/initialize the driver.
|
||
|
||
PLIP is rather weird, because of the way it interacts with the parport
|
||
system. It is _not_ initialised from Space.c. Instead, plip_init()
|
||
is called, and that function makes up a "struct net_device" for each port, and
|
||
then calls us here.
|
||
|
||
*/
|
||
static void
|
||
plip_init_netdev(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
|
||
/* Then, override parts of it */
|
||
dev->hard_start_xmit = plip_tx_packet;
|
||
dev->open = plip_open;
|
||
dev->stop = plip_close;
|
||
dev->get_stats = plip_get_stats;
|
||
dev->do_ioctl = plip_ioctl;
|
||
dev->header_cache_update = NULL;
|
||
dev->tx_queue_len = 10;
|
||
dev->flags = IFF_POINTOPOINT|IFF_NOARP;
|
||
memset(dev->dev_addr, 0xfc, ETH_ALEN);
|
||
|
||
/* Set the private structure */
|
||
nl->orig_hard_header = dev->hard_header;
|
||
dev->hard_header = plip_hard_header;
|
||
|
||
nl->orig_hard_header_cache = dev->hard_header_cache;
|
||
dev->hard_header_cache = plip_hard_header_cache;
|
||
|
||
|
||
nl->port_owner = 0;
|
||
|
||
/* Initialize constants */
|
||
nl->trigger = PLIP_TRIGGER_WAIT;
|
||
nl->nibble = PLIP_NIBBLE_WAIT;
|
||
|
||
/* Initialize task queue structures */
|
||
INIT_WORK(&nl->immediate, (void (*)(void *))plip_bh, dev);
|
||
INIT_WORK(&nl->deferred, (void (*)(void *))plip_kick_bh, dev);
|
||
|
||
if (dev->irq == -1)
|
||
INIT_WORK(&nl->timer, (void (*)(void *))plip_timer_bh, dev);
|
||
|
||
spin_lock_init(&nl->lock);
|
||
}
|
||
|
||
/* Bottom half handler for the delayed request.
|
||
This routine is kicked by do_timer().
|
||
Request `plip_bh' to be invoked. */
|
||
static void
|
||
plip_kick_bh(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
|
||
if (nl->is_deferred)
|
||
schedule_work(&nl->immediate);
|
||
}
|
||
|
||
/* Forward declarations of internal routines */
|
||
static int plip_none(struct net_device *, struct net_local *,
|
||
struct plip_local *, struct plip_local *);
|
||
static int plip_receive_packet(struct net_device *, struct net_local *,
|
||
struct plip_local *, struct plip_local *);
|
||
static int plip_send_packet(struct net_device *, struct net_local *,
|
||
struct plip_local *, struct plip_local *);
|
||
static int plip_connection_close(struct net_device *, struct net_local *,
|
||
struct plip_local *, struct plip_local *);
|
||
static int plip_error(struct net_device *, struct net_local *,
|
||
struct plip_local *, struct plip_local *);
|
||
static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd,
|
||
struct plip_local *rcv,
|
||
int error);
|
||
|
||
#define OK 0
|
||
#define TIMEOUT 1
|
||
#define ERROR 2
|
||
#define HS_TIMEOUT 3
|
||
|
||
typedef int (*plip_func)(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv);
|
||
|
||
static plip_func connection_state_table[] =
|
||
{
|
||
plip_none,
|
||
plip_receive_packet,
|
||
plip_send_packet,
|
||
plip_connection_close,
|
||
plip_error
|
||
};
|
||
|
||
/* Bottom half handler of PLIP. */
|
||
static void
|
||
plip_bh(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct plip_local *snd = &nl->snd_data;
|
||
struct plip_local *rcv = &nl->rcv_data;
|
||
plip_func f;
|
||
int r;
|
||
|
||
nl->is_deferred = 0;
|
||
f = connection_state_table[nl->connection];
|
||
if ((r = (*f)(dev, nl, snd, rcv)) != OK
|
||
&& (r = plip_bh_timeout_error(dev, nl, snd, rcv, r)) != OK) {
|
||
nl->is_deferred = 1;
|
||
schedule_delayed_work(&nl->deferred, 1);
|
||
}
|
||
}
|
||
|
||
static void
|
||
plip_timer_bh(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
|
||
if (!(atomic_read (&nl->kill_timer))) {
|
||
plip_interrupt (-1, dev, NULL);
|
||
|
||
schedule_delayed_work(&nl->timer, 1);
|
||
}
|
||
else {
|
||
up (&nl->killed_timer_sem);
|
||
}
|
||
}
|
||
|
||
static int
|
||
plip_bh_timeout_error(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv,
|
||
int error)
|
||
{
|
||
unsigned char c0;
|
||
/*
|
||
* This is tricky. If we got here from the beginning of send (either
|
||
* with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's
|
||
* already disabled. With the old variant of {enable,disable}_irq()
|
||
* extra disable_irq() was a no-op. Now it became mortal - it's
|
||
* unbalanced and thus we'll never re-enable IRQ (until rmmod plip,
|
||
* that is). So we have to treat HS_TIMEOUT and ERROR from send
|
||
* in a special way.
|
||
*/
|
||
|
||
spin_lock_irq(&nl->lock);
|
||
if (nl->connection == PLIP_CN_SEND) {
|
||
|
||
if (error != ERROR) { /* Timeout */
|
||
nl->timeout_count++;
|
||
if ((error == HS_TIMEOUT
|
||
&& nl->timeout_count <= 10)
|
||
|| nl->timeout_count <= 3) {
|
||
spin_unlock_irq(&nl->lock);
|
||
/* Try again later */
|
||
return TIMEOUT;
|
||
}
|
||
c0 = read_status(dev);
|
||
printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n",
|
||
dev->name, snd->state, c0);
|
||
} else
|
||
error = HS_TIMEOUT;
|
||
nl->enet_stats.tx_errors++;
|
||
nl->enet_stats.tx_aborted_errors++;
|
||
} else if (nl->connection == PLIP_CN_RECEIVE) {
|
||
if (rcv->state == PLIP_PK_TRIGGER) {
|
||
/* Transmission was interrupted. */
|
||
spin_unlock_irq(&nl->lock);
|
||
return OK;
|
||
}
|
||
if (error != ERROR) { /* Timeout */
|
||
if (++nl->timeout_count <= 3) {
|
||
spin_unlock_irq(&nl->lock);
|
||
/* Try again later */
|
||
return TIMEOUT;
|
||
}
|
||
c0 = read_status(dev);
|
||
printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n",
|
||
dev->name, rcv->state, c0);
|
||
}
|
||
nl->enet_stats.rx_dropped++;
|
||
}
|
||
rcv->state = PLIP_PK_DONE;
|
||
if (rcv->skb) {
|
||
kfree_skb(rcv->skb);
|
||
rcv->skb = NULL;
|
||
}
|
||
snd->state = PLIP_PK_DONE;
|
||
if (snd->skb) {
|
||
dev_kfree_skb(snd->skb);
|
||
snd->skb = NULL;
|
||
}
|
||
spin_unlock_irq(&nl->lock);
|
||
if (error == HS_TIMEOUT) {
|
||
DISABLE(dev->irq);
|
||
synchronize_irq(dev->irq);
|
||
}
|
||
disable_parport_interrupts (dev);
|
||
netif_stop_queue (dev);
|
||
nl->connection = PLIP_CN_ERROR;
|
||
write_data (dev, 0x00);
|
||
|
||
return TIMEOUT;
|
||
}
|
||
|
||
static int
|
||
plip_none(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv)
|
||
{
|
||
return OK;
|
||
}
|
||
|
||
/* PLIP_RECEIVE --- receive a byte(two nibbles)
|
||
Returns OK on success, TIMEOUT on timeout */
|
||
inline static int
|
||
plip_receive(unsigned short nibble_timeout, struct net_device *dev,
|
||
enum plip_nibble_state *ns_p, unsigned char *data_p)
|
||
{
|
||
unsigned char c0, c1;
|
||
unsigned int cx;
|
||
|
||
switch (*ns_p) {
|
||
case PLIP_NB_BEGIN:
|
||
cx = nibble_timeout;
|
||
while (1) {
|
||
c0 = read_status(dev);
|
||
udelay(PLIP_DELAY_UNIT);
|
||
if ((c0 & 0x80) == 0) {
|
||
c1 = read_status(dev);
|
||
if (c0 == c1)
|
||
break;
|
||
}
|
||
if (--cx == 0)
|
||
return TIMEOUT;
|
||
}
|
||
*data_p = (c0 >> 3) & 0x0f;
|
||
write_data (dev, 0x10); /* send ACK */
|
||
*ns_p = PLIP_NB_1;
|
||
|
||
case PLIP_NB_1:
|
||
cx = nibble_timeout;
|
||
while (1) {
|
||
c0 = read_status(dev);
|
||
udelay(PLIP_DELAY_UNIT);
|
||
if (c0 & 0x80) {
|
||
c1 = read_status(dev);
|
||
if (c0 == c1)
|
||
break;
|
||
}
|
||
if (--cx == 0)
|
||
return TIMEOUT;
|
||
}
|
||
*data_p |= (c0 << 1) & 0xf0;
|
||
write_data (dev, 0x00); /* send ACK */
|
||
*ns_p = PLIP_NB_BEGIN;
|
||
case PLIP_NB_2:
|
||
break;
|
||
}
|
||
return OK;
|
||
}
|
||
|
||
/*
|
||
* Determine the packet's protocol ID. The rule here is that we
|
||
* assume 802.3 if the type field is short enough to be a length.
|
||
* This is normal practice and works for any 'now in use' protocol.
|
||
*
|
||
* PLIP is ethernet ish but the daddr might not be valid if unicast.
|
||
* PLIP fortunately has no bus architecture (its Point-to-point).
|
||
*
|
||
* We can't fix the daddr thing as that quirk (more bug) is embedded
|
||
* in far too many old systems not all even running Linux.
|
||
*/
|
||
|
||
static unsigned short plip_type_trans(struct sk_buff *skb, struct net_device *dev)
|
||
{
|
||
struct ethhdr *eth;
|
||
unsigned char *rawp;
|
||
|
||
skb->mac.raw=skb->data;
|
||
skb_pull(skb,dev->hard_header_len);
|
||
eth = eth_hdr(skb);
|
||
|
||
if(*eth->h_dest&1)
|
||
{
|
||
if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
|
||
skb->pkt_type=PACKET_BROADCAST;
|
||
else
|
||
skb->pkt_type=PACKET_MULTICAST;
|
||
}
|
||
|
||
/*
|
||
* This ALLMULTI check should be redundant by 1.4
|
||
* so don't forget to remove it.
|
||
*/
|
||
|
||
if (ntohs(eth->h_proto) >= 1536)
|
||
return eth->h_proto;
|
||
|
||
rawp = skb->data;
|
||
|
||
/*
|
||
* This is a magic hack to spot IPX packets. Older Novell breaks
|
||
* the protocol design and runs IPX over 802.3 without an 802.2 LLC
|
||
* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
|
||
* won't work for fault tolerant netware but does for the rest.
|
||
*/
|
||
if (*(unsigned short *)rawp == 0xFFFF)
|
||
return htons(ETH_P_802_3);
|
||
|
||
/*
|
||
* Real 802.2 LLC
|
||
*/
|
||
return htons(ETH_P_802_2);
|
||
}
|
||
|
||
|
||
/* PLIP_RECEIVE_PACKET --- receive a packet */
|
||
static int
|
||
plip_receive_packet(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv)
|
||
{
|
||
unsigned short nibble_timeout = nl->nibble;
|
||
unsigned char *lbuf;
|
||
|
||
switch (rcv->state) {
|
||
case PLIP_PK_TRIGGER:
|
||
DISABLE(dev->irq);
|
||
/* Don't need to synchronize irq, as we can safely ignore it */
|
||
disable_parport_interrupts (dev);
|
||
write_data (dev, 0x01); /* send ACK */
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: receive start\n", dev->name);
|
||
rcv->state = PLIP_PK_LENGTH_LSB;
|
||
rcv->nibble = PLIP_NB_BEGIN;
|
||
|
||
case PLIP_PK_LENGTH_LSB:
|
||
if (snd->state != PLIP_PK_DONE) {
|
||
if (plip_receive(nl->trigger, dev,
|
||
&rcv->nibble, &rcv->length.b.lsb)) {
|
||
/* collision, here dev->tbusy == 1 */
|
||
rcv->state = PLIP_PK_DONE;
|
||
nl->is_deferred = 1;
|
||
nl->connection = PLIP_CN_SEND;
|
||
schedule_delayed_work(&nl->deferred, 1);
|
||
enable_parport_interrupts (dev);
|
||
ENABLE(dev->irq);
|
||
return OK;
|
||
}
|
||
} else {
|
||
if (plip_receive(nibble_timeout, dev,
|
||
&rcv->nibble, &rcv->length.b.lsb))
|
||
return TIMEOUT;
|
||
}
|
||
rcv->state = PLIP_PK_LENGTH_MSB;
|
||
|
||
case PLIP_PK_LENGTH_MSB:
|
||
if (plip_receive(nibble_timeout, dev,
|
||
&rcv->nibble, &rcv->length.b.msb))
|
||
return TIMEOUT;
|
||
if (rcv->length.h > dev->mtu + dev->hard_header_len
|
||
|| rcv->length.h < 8) {
|
||
printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h);
|
||
return ERROR;
|
||
}
|
||
/* Malloc up new buffer. */
|
||
rcv->skb = dev_alloc_skb(rcv->length.h + 2);
|
||
if (rcv->skb == NULL) {
|
||
printk(KERN_ERR "%s: Memory squeeze.\n", dev->name);
|
||
return ERROR;
|
||
}
|
||
skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */
|
||
skb_put(rcv->skb,rcv->length.h);
|
||
rcv->skb->dev = dev;
|
||
rcv->state = PLIP_PK_DATA;
|
||
rcv->byte = 0;
|
||
rcv->checksum = 0;
|
||
|
||
case PLIP_PK_DATA:
|
||
lbuf = rcv->skb->data;
|
||
do
|
||
if (plip_receive(nibble_timeout, dev,
|
||
&rcv->nibble, &lbuf[rcv->byte]))
|
||
return TIMEOUT;
|
||
while (++rcv->byte < rcv->length.h);
|
||
do
|
||
rcv->checksum += lbuf[--rcv->byte];
|
||
while (rcv->byte);
|
||
rcv->state = PLIP_PK_CHECKSUM;
|
||
|
||
case PLIP_PK_CHECKSUM:
|
||
if (plip_receive(nibble_timeout, dev,
|
||
&rcv->nibble, &rcv->data))
|
||
return TIMEOUT;
|
||
if (rcv->data != rcv->checksum) {
|
||
nl->enet_stats.rx_crc_errors++;
|
||
if (net_debug)
|
||
printk(KERN_DEBUG "%s: checksum error\n", dev->name);
|
||
return ERROR;
|
||
}
|
||
rcv->state = PLIP_PK_DONE;
|
||
|
||
case PLIP_PK_DONE:
|
||
/* Inform the upper layer for the arrival of a packet. */
|
||
rcv->skb->protocol=plip_type_trans(rcv->skb, dev);
|
||
netif_rx(rcv->skb);
|
||
dev->last_rx = jiffies;
|
||
nl->enet_stats.rx_bytes += rcv->length.h;
|
||
nl->enet_stats.rx_packets++;
|
||
rcv->skb = NULL;
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: receive end\n", dev->name);
|
||
|
||
/* Close the connection. */
|
||
write_data (dev, 0x00);
|
||
spin_lock_irq(&nl->lock);
|
||
if (snd->state != PLIP_PK_DONE) {
|
||
nl->connection = PLIP_CN_SEND;
|
||
spin_unlock_irq(&nl->lock);
|
||
schedule_work(&nl->immediate);
|
||
enable_parport_interrupts (dev);
|
||
ENABLE(dev->irq);
|
||
return OK;
|
||
} else {
|
||
nl->connection = PLIP_CN_NONE;
|
||
spin_unlock_irq(&nl->lock);
|
||
enable_parport_interrupts (dev);
|
||
ENABLE(dev->irq);
|
||
return OK;
|
||
}
|
||
}
|
||
return OK;
|
||
}
|
||
|
||
/* PLIP_SEND --- send a byte (two nibbles)
|
||
Returns OK on success, TIMEOUT when timeout */
|
||
inline static int
|
||
plip_send(unsigned short nibble_timeout, struct net_device *dev,
|
||
enum plip_nibble_state *ns_p, unsigned char data)
|
||
{
|
||
unsigned char c0;
|
||
unsigned int cx;
|
||
|
||
switch (*ns_p) {
|
||
case PLIP_NB_BEGIN:
|
||
write_data (dev, data & 0x0f);
|
||
*ns_p = PLIP_NB_1;
|
||
|
||
case PLIP_NB_1:
|
||
write_data (dev, 0x10 | (data & 0x0f));
|
||
cx = nibble_timeout;
|
||
while (1) {
|
||
c0 = read_status(dev);
|
||
if ((c0 & 0x80) == 0)
|
||
break;
|
||
if (--cx == 0)
|
||
return TIMEOUT;
|
||
udelay(PLIP_DELAY_UNIT);
|
||
}
|
||
write_data (dev, 0x10 | (data >> 4));
|
||
*ns_p = PLIP_NB_2;
|
||
|
||
case PLIP_NB_2:
|
||
write_data (dev, (data >> 4));
|
||
cx = nibble_timeout;
|
||
while (1) {
|
||
c0 = read_status(dev);
|
||
if (c0 & 0x80)
|
||
break;
|
||
if (--cx == 0)
|
||
return TIMEOUT;
|
||
udelay(PLIP_DELAY_UNIT);
|
||
}
|
||
*ns_p = PLIP_NB_BEGIN;
|
||
return OK;
|
||
}
|
||
return OK;
|
||
}
|
||
|
||
/* PLIP_SEND_PACKET --- send a packet */
|
||
static int
|
||
plip_send_packet(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv)
|
||
{
|
||
unsigned short nibble_timeout = nl->nibble;
|
||
unsigned char *lbuf;
|
||
unsigned char c0;
|
||
unsigned int cx;
|
||
|
||
if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) {
|
||
printk(KERN_DEBUG "%s: send skb lost\n", dev->name);
|
||
snd->state = PLIP_PK_DONE;
|
||
snd->skb = NULL;
|
||
return ERROR;
|
||
}
|
||
|
||
switch (snd->state) {
|
||
case PLIP_PK_TRIGGER:
|
||
if ((read_status(dev) & 0xf8) != 0x80)
|
||
return HS_TIMEOUT;
|
||
|
||
/* Trigger remote rx interrupt. */
|
||
write_data (dev, 0x08);
|
||
cx = nl->trigger;
|
||
while (1) {
|
||
udelay(PLIP_DELAY_UNIT);
|
||
spin_lock_irq(&nl->lock);
|
||
if (nl->connection == PLIP_CN_RECEIVE) {
|
||
spin_unlock_irq(&nl->lock);
|
||
/* Interrupted. */
|
||
nl->enet_stats.collisions++;
|
||
return OK;
|
||
}
|
||
c0 = read_status(dev);
|
||
if (c0 & 0x08) {
|
||
spin_unlock_irq(&nl->lock);
|
||
DISABLE(dev->irq);
|
||
synchronize_irq(dev->irq);
|
||
if (nl->connection == PLIP_CN_RECEIVE) {
|
||
/* Interrupted.
|
||
We don't need to enable irq,
|
||
as it is soon disabled. */
|
||
/* Yes, we do. New variant of
|
||
{enable,disable}_irq *counts*
|
||
them. -- AV */
|
||
ENABLE(dev->irq);
|
||
nl->enet_stats.collisions++;
|
||
return OK;
|
||
}
|
||
disable_parport_interrupts (dev);
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: send start\n", dev->name);
|
||
snd->state = PLIP_PK_LENGTH_LSB;
|
||
snd->nibble = PLIP_NB_BEGIN;
|
||
nl->timeout_count = 0;
|
||
break;
|
||
}
|
||
spin_unlock_irq(&nl->lock);
|
||
if (--cx == 0) {
|
||
write_data (dev, 0x00);
|
||
return HS_TIMEOUT;
|
||
}
|
||
}
|
||
|
||
case PLIP_PK_LENGTH_LSB:
|
||
if (plip_send(nibble_timeout, dev,
|
||
&snd->nibble, snd->length.b.lsb))
|
||
return TIMEOUT;
|
||
snd->state = PLIP_PK_LENGTH_MSB;
|
||
|
||
case PLIP_PK_LENGTH_MSB:
|
||
if (plip_send(nibble_timeout, dev,
|
||
&snd->nibble, snd->length.b.msb))
|
||
return TIMEOUT;
|
||
snd->state = PLIP_PK_DATA;
|
||
snd->byte = 0;
|
||
snd->checksum = 0;
|
||
|
||
case PLIP_PK_DATA:
|
||
do
|
||
if (plip_send(nibble_timeout, dev,
|
||
&snd->nibble, lbuf[snd->byte]))
|
||
return TIMEOUT;
|
||
while (++snd->byte < snd->length.h);
|
||
do
|
||
snd->checksum += lbuf[--snd->byte];
|
||
while (snd->byte);
|
||
snd->state = PLIP_PK_CHECKSUM;
|
||
|
||
case PLIP_PK_CHECKSUM:
|
||
if (plip_send(nibble_timeout, dev,
|
||
&snd->nibble, snd->checksum))
|
||
return TIMEOUT;
|
||
|
||
nl->enet_stats.tx_bytes += snd->skb->len;
|
||
dev_kfree_skb(snd->skb);
|
||
nl->enet_stats.tx_packets++;
|
||
snd->state = PLIP_PK_DONE;
|
||
|
||
case PLIP_PK_DONE:
|
||
/* Close the connection */
|
||
write_data (dev, 0x00);
|
||
snd->skb = NULL;
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: send end\n", dev->name);
|
||
nl->connection = PLIP_CN_CLOSING;
|
||
nl->is_deferred = 1;
|
||
schedule_delayed_work(&nl->deferred, 1);
|
||
enable_parport_interrupts (dev);
|
||
ENABLE(dev->irq);
|
||
return OK;
|
||
}
|
||
return OK;
|
||
}
|
||
|
||
static int
|
||
plip_connection_close(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv)
|
||
{
|
||
spin_lock_irq(&nl->lock);
|
||
if (nl->connection == PLIP_CN_CLOSING) {
|
||
nl->connection = PLIP_CN_NONE;
|
||
netif_wake_queue (dev);
|
||
}
|
||
spin_unlock_irq(&nl->lock);
|
||
if (nl->should_relinquish) {
|
||
nl->should_relinquish = nl->port_owner = 0;
|
||
parport_release(nl->pardev);
|
||
}
|
||
return OK;
|
||
}
|
||
|
||
/* PLIP_ERROR --- wait till other end settled */
|
||
static int
|
||
plip_error(struct net_device *dev, struct net_local *nl,
|
||
struct plip_local *snd, struct plip_local *rcv)
|
||
{
|
||
unsigned char status;
|
||
|
||
status = read_status(dev);
|
||
if ((status & 0xf8) == 0x80) {
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: reset interface.\n", dev->name);
|
||
nl->connection = PLIP_CN_NONE;
|
||
nl->should_relinquish = 0;
|
||
netif_start_queue (dev);
|
||
enable_parport_interrupts (dev);
|
||
ENABLE(dev->irq);
|
||
netif_wake_queue (dev);
|
||
} else {
|
||
nl->is_deferred = 1;
|
||
schedule_delayed_work(&nl->deferred, 1);
|
||
}
|
||
|
||
return OK;
|
||
}
|
||
|
||
/* Handle the parallel port interrupts. */
|
||
static void
|
||
plip_interrupt(int irq, void *dev_id, struct pt_regs * regs)
|
||
{
|
||
struct net_device *dev = dev_id;
|
||
struct net_local *nl;
|
||
struct plip_local *rcv;
|
||
unsigned char c0;
|
||
|
||
if (dev == NULL) {
|
||
printk(KERN_DEBUG "plip_interrupt: irq %d for unknown device.\n", irq);
|
||
return;
|
||
}
|
||
|
||
nl = netdev_priv(dev);
|
||
rcv = &nl->rcv_data;
|
||
|
||
spin_lock_irq (&nl->lock);
|
||
|
||
c0 = read_status(dev);
|
||
if ((c0 & 0xf8) != 0xc0) {
|
||
if ((dev->irq != -1) && (net_debug > 1))
|
||
printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name);
|
||
spin_unlock_irq (&nl->lock);
|
||
return;
|
||
}
|
||
|
||
if (net_debug > 3)
|
||
printk(KERN_DEBUG "%s: interrupt.\n", dev->name);
|
||
|
||
switch (nl->connection) {
|
||
case PLIP_CN_CLOSING:
|
||
netif_wake_queue (dev);
|
||
case PLIP_CN_NONE:
|
||
case PLIP_CN_SEND:
|
||
rcv->state = PLIP_PK_TRIGGER;
|
||
nl->connection = PLIP_CN_RECEIVE;
|
||
nl->timeout_count = 0;
|
||
schedule_work(&nl->immediate);
|
||
break;
|
||
|
||
case PLIP_CN_RECEIVE:
|
||
/* May occur because there is race condition
|
||
around test and set of dev->interrupt.
|
||
Ignore this interrupt. */
|
||
break;
|
||
|
||
case PLIP_CN_ERROR:
|
||
printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name);
|
||
break;
|
||
}
|
||
|
||
spin_unlock_irq(&nl->lock);
|
||
}
|
||
|
||
static int
|
||
plip_tx_packet(struct sk_buff *skb, struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct plip_local *snd = &nl->snd_data;
|
||
|
||
if (netif_queue_stopped(dev))
|
||
return 1;
|
||
|
||
/* We may need to grab the bus */
|
||
if (!nl->port_owner) {
|
||
if (parport_claim(nl->pardev))
|
||
return 1;
|
||
nl->port_owner = 1;
|
||
}
|
||
|
||
netif_stop_queue (dev);
|
||
|
||
if (skb->len > dev->mtu + dev->hard_header_len) {
|
||
printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len);
|
||
netif_start_queue (dev);
|
||
return 1;
|
||
}
|
||
|
||
if (net_debug > 2)
|
||
printk(KERN_DEBUG "%s: send request\n", dev->name);
|
||
|
||
spin_lock_irq(&nl->lock);
|
||
dev->trans_start = jiffies;
|
||
snd->skb = skb;
|
||
snd->length.h = skb->len;
|
||
snd->state = PLIP_PK_TRIGGER;
|
||
if (nl->connection == PLIP_CN_NONE) {
|
||
nl->connection = PLIP_CN_SEND;
|
||
nl->timeout_count = 0;
|
||
}
|
||
schedule_work(&nl->immediate);
|
||
spin_unlock_irq(&nl->lock);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
plip_rewrite_address(struct net_device *dev, struct ethhdr *eth)
|
||
{
|
||
struct in_device *in_dev;
|
||
|
||
if ((in_dev=dev->ip_ptr) != NULL) {
|
||
/* Any address will do - we take the first */
|
||
struct in_ifaddr *ifa=in_dev->ifa_list;
|
||
if (ifa != NULL) {
|
||
memcpy(eth->h_source, dev->dev_addr, 6);
|
||
memset(eth->h_dest, 0xfc, 2);
|
||
memcpy(eth->h_dest+2, &ifa->ifa_address, 4);
|
||
}
|
||
}
|
||
}
|
||
|
||
static int
|
||
plip_hard_header(struct sk_buff *skb, struct net_device *dev,
|
||
unsigned short type, void *daddr,
|
||
void *saddr, unsigned len)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
int ret;
|
||
|
||
if ((ret = nl->orig_hard_header(skb, dev, type, daddr, saddr, len)) >= 0)
|
||
plip_rewrite_address (dev, (struct ethhdr *)skb->data);
|
||
|
||
return ret;
|
||
}
|
||
|
||
int plip_hard_header_cache(struct neighbour *neigh,
|
||
struct hh_cache *hh)
|
||
{
|
||
struct net_local *nl = neigh->dev->priv;
|
||
int ret;
|
||
|
||
if ((ret = nl->orig_hard_header_cache(neigh, hh)) == 0)
|
||
{
|
||
struct ethhdr *eth;
|
||
|
||
eth = (struct ethhdr*)(((u8*)hh->hh_data) +
|
||
HH_DATA_OFF(sizeof(*eth)));
|
||
plip_rewrite_address (neigh->dev, eth);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Open/initialize the board. This is called (in the current kernel)
|
||
sometime after booting when the 'ifconfig' program is run.
|
||
|
||
This routine gets exclusive access to the parallel port by allocating
|
||
its IRQ line.
|
||
*/
|
||
static int
|
||
plip_open(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct in_device *in_dev;
|
||
|
||
/* Grab the port */
|
||
if (!nl->port_owner) {
|
||
if (parport_claim(nl->pardev)) return -EAGAIN;
|
||
nl->port_owner = 1;
|
||
}
|
||
|
||
nl->should_relinquish = 0;
|
||
|
||
/* Clear the data port. */
|
||
write_data (dev, 0x00);
|
||
|
||
/* Enable rx interrupt. */
|
||
enable_parport_interrupts (dev);
|
||
if (dev->irq == -1)
|
||
{
|
||
atomic_set (&nl->kill_timer, 0);
|
||
schedule_delayed_work(&nl->timer, 1);
|
||
}
|
||
|
||
/* Initialize the state machine. */
|
||
nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE;
|
||
nl->rcv_data.skb = nl->snd_data.skb = NULL;
|
||
nl->connection = PLIP_CN_NONE;
|
||
nl->is_deferred = 0;
|
||
|
||
/* Fill in the MAC-level header.
|
||
We used to abuse dev->broadcast to store the point-to-point
|
||
MAC address, but we no longer do it. Instead, we fetch the
|
||
interface address whenever it is needed, which is cheap enough
|
||
because we use the hh_cache. Actually, abusing dev->broadcast
|
||
didn't work, because when using plip_open the point-to-point
|
||
address isn't yet known.
|
||
PLIP doesn't have a real MAC address, but we need it to be
|
||
DOS compatible, and to properly support taps (otherwise,
|
||
when the device address isn't identical to the address of a
|
||
received frame, the kernel incorrectly drops it). */
|
||
|
||
if ((in_dev=dev->ip_ptr) != NULL) {
|
||
/* Any address will do - we take the first. We already
|
||
have the first two bytes filled with 0xfc, from
|
||
plip_init_dev(). */
|
||
struct in_ifaddr *ifa=in_dev->ifa_list;
|
||
if (ifa != NULL) {
|
||
memcpy(dev->dev_addr+2, &ifa->ifa_local, 4);
|
||
}
|
||
}
|
||
|
||
netif_start_queue (dev);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* The inverse routine to plip_open (). */
|
||
static int
|
||
plip_close(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct plip_local *snd = &nl->snd_data;
|
||
struct plip_local *rcv = &nl->rcv_data;
|
||
|
||
netif_stop_queue (dev);
|
||
DISABLE(dev->irq);
|
||
synchronize_irq(dev->irq);
|
||
|
||
if (dev->irq == -1)
|
||
{
|
||
init_MUTEX_LOCKED (&nl->killed_timer_sem);
|
||
atomic_set (&nl->kill_timer, 1);
|
||
down (&nl->killed_timer_sem);
|
||
}
|
||
|
||
#ifdef NOTDEF
|
||
outb(0x00, PAR_DATA(dev));
|
||
#endif
|
||
nl->is_deferred = 0;
|
||
nl->connection = PLIP_CN_NONE;
|
||
if (nl->port_owner) {
|
||
parport_release(nl->pardev);
|
||
nl->port_owner = 0;
|
||
}
|
||
|
||
snd->state = PLIP_PK_DONE;
|
||
if (snd->skb) {
|
||
dev_kfree_skb(snd->skb);
|
||
snd->skb = NULL;
|
||
}
|
||
rcv->state = PLIP_PK_DONE;
|
||
if (rcv->skb) {
|
||
kfree_skb(rcv->skb);
|
||
rcv->skb = NULL;
|
||
}
|
||
|
||
#ifdef NOTDEF
|
||
/* Reset. */
|
||
outb(0x00, PAR_CONTROL(dev));
|
||
#endif
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
plip_preempt(void *handle)
|
||
{
|
||
struct net_device *dev = (struct net_device *)handle;
|
||
struct net_local *nl = netdev_priv(dev);
|
||
|
||
/* Stand our ground if a datagram is on the wire */
|
||
if (nl->connection != PLIP_CN_NONE) {
|
||
nl->should_relinquish = 1;
|
||
return 1;
|
||
}
|
||
|
||
nl->port_owner = 0; /* Remember that we released the bus */
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
plip_wakeup(void *handle)
|
||
{
|
||
struct net_device *dev = (struct net_device *)handle;
|
||
struct net_local *nl = netdev_priv(dev);
|
||
|
||
if (nl->port_owner) {
|
||
/* Why are we being woken up? */
|
||
printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name);
|
||
if (!parport_claim(nl->pardev))
|
||
/* bus_owner is already set (but why?) */
|
||
printk(KERN_DEBUG "%s: I'm broken.\n", dev->name);
|
||
else
|
||
return;
|
||
}
|
||
|
||
if (!(dev->flags & IFF_UP))
|
||
/* Don't need the port when the interface is down */
|
||
return;
|
||
|
||
if (!parport_claim(nl->pardev)) {
|
||
nl->port_owner = 1;
|
||
/* Clear the data port. */
|
||
write_data (dev, 0x00);
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
static struct net_device_stats *
|
||
plip_get_stats(struct net_device *dev)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct net_device_stats *r = &nl->enet_stats;
|
||
|
||
return r;
|
||
}
|
||
|
||
static int
|
||
plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
|
||
{
|
||
struct net_local *nl = netdev_priv(dev);
|
||
struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru;
|
||
|
||
if (cmd != SIOCDEVPLIP)
|
||
return -EOPNOTSUPP;
|
||
|
||
switch(pc->pcmd) {
|
||
case PLIP_GET_TIMEOUT:
|
||
pc->trigger = nl->trigger;
|
||
pc->nibble = nl->nibble;
|
||
break;
|
||
case PLIP_SET_TIMEOUT:
|
||
if(!capable(CAP_NET_ADMIN))
|
||
return -EPERM;
|
||
nl->trigger = pc->trigger;
|
||
nl->nibble = pc->nibble;
|
||
break;
|
||
default:
|
||
return -EOPNOTSUPP;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 };
|
||
static int timid;
|
||
|
||
module_param_array(parport, int, NULL, 0);
|
||
module_param(timid, int, 0);
|
||
MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip");
|
||
|
||
static struct net_device *dev_plip[PLIP_MAX] = { NULL, };
|
||
|
||
static inline int
|
||
plip_searchfor(int list[], int a)
|
||
{
|
||
int i;
|
||
for (i = 0; i < PLIP_MAX && list[i] != -1; i++) {
|
||
if (list[i] == a) return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* plip_attach() is called (by the parport code) when a port is
|
||
* available to use. */
|
||
static void plip_attach (struct parport *port)
|
||
{
|
||
static int unit;
|
||
struct net_device *dev;
|
||
struct net_local *nl;
|
||
char name[IFNAMSIZ];
|
||
|
||
if ((parport[0] == -1 && (!timid || !port->devices)) ||
|
||
plip_searchfor(parport, port->number)) {
|
||
if (unit == PLIP_MAX) {
|
||
printk(KERN_ERR "plip: too many devices\n");
|
||
return;
|
||
}
|
||
|
||
sprintf(name, "plip%d", unit);
|
||
dev = alloc_etherdev(sizeof(struct net_local));
|
||
if (!dev) {
|
||
printk(KERN_ERR "plip: memory squeeze\n");
|
||
return;
|
||
}
|
||
|
||
strcpy(dev->name, name);
|
||
|
||
SET_MODULE_OWNER(dev);
|
||
dev->irq = port->irq;
|
||
dev->base_addr = port->base;
|
||
if (port->irq == -1) {
|
||
printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode,"
|
||
"which is fairly inefficient!\n", port->name);
|
||
}
|
||
|
||
nl = netdev_priv(dev);
|
||
nl->pardev = parport_register_device(port, name, plip_preempt,
|
||
plip_wakeup, plip_interrupt,
|
||
0, dev);
|
||
|
||
if (!nl->pardev) {
|
||
printk(KERN_ERR "%s: parport_register failed\n", name);
|
||
goto err_free_dev;
|
||
return;
|
||
}
|
||
|
||
plip_init_netdev(dev);
|
||
|
||
if (register_netdev(dev)) {
|
||
printk(KERN_ERR "%s: network register failed\n", name);
|
||
goto err_parport_unregister;
|
||
}
|
||
|
||
printk(KERN_INFO "%s", version);
|
||
if (dev->irq != -1)
|
||
printk(KERN_INFO "%s: Parallel port at %#3lx, "
|
||
"using IRQ %d.\n",
|
||
dev->name, dev->base_addr, dev->irq);
|
||
else
|
||
printk(KERN_INFO "%s: Parallel port at %#3lx, "
|
||
"not using IRQ.\n",
|
||
dev->name, dev->base_addr);
|
||
dev_plip[unit++] = dev;
|
||
}
|
||
return;
|
||
|
||
err_parport_unregister:
|
||
parport_unregister_device(nl->pardev);
|
||
err_free_dev:
|
||
free_netdev(dev);
|
||
return;
|
||
}
|
||
|
||
/* plip_detach() is called (by the parport code) when a port is
|
||
* no longer available to use. */
|
||
static void plip_detach (struct parport *port)
|
||
{
|
||
/* Nothing to do */
|
||
}
|
||
|
||
static struct parport_driver plip_driver = {
|
||
.name = "plip",
|
||
.attach = plip_attach,
|
||
.detach = plip_detach
|
||
};
|
||
|
||
static void __exit plip_cleanup_module (void)
|
||
{
|
||
struct net_device *dev;
|
||
int i;
|
||
|
||
parport_unregister_driver (&plip_driver);
|
||
|
||
for (i=0; i < PLIP_MAX; i++) {
|
||
if ((dev = dev_plip[i])) {
|
||
struct net_local *nl = netdev_priv(dev);
|
||
unregister_netdev(dev);
|
||
if (nl->port_owner)
|
||
parport_release(nl->pardev);
|
||
parport_unregister_device(nl->pardev);
|
||
free_netdev(dev);
|
||
dev_plip[i] = NULL;
|
||
}
|
||
}
|
||
}
|
||
|
||
#ifndef MODULE
|
||
|
||
static int parport_ptr;
|
||
|
||
static int __init plip_setup(char *str)
|
||
{
|
||
int ints[4];
|
||
|
||
str = get_options(str, ARRAY_SIZE(ints), ints);
|
||
|
||
/* Ugh. */
|
||
if (!strncmp(str, "parport", 7)) {
|
||
int n = simple_strtoul(str+7, NULL, 10);
|
||
if (parport_ptr < PLIP_MAX)
|
||
parport[parport_ptr++] = n;
|
||
else
|
||
printk(KERN_INFO "plip: too many ports, %s ignored.\n",
|
||
str);
|
||
} else if (!strcmp(str, "timid")) {
|
||
timid = 1;
|
||
} else {
|
||
if (ints[0] == 0 || ints[1] == 0) {
|
||
/* disable driver on "plip=" or "plip=0" */
|
||
parport[0] = -2;
|
||
} else {
|
||
printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n",
|
||
ints[1]);
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
__setup("plip=", plip_setup);
|
||
|
||
#endif /* !MODULE */
|
||
|
||
static int __init plip_init (void)
|
||
{
|
||
if (parport[0] == -2)
|
||
return 0;
|
||
|
||
if (parport[0] != -1 && timid) {
|
||
printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n");
|
||
timid = 0;
|
||
}
|
||
|
||
if (parport_register_driver (&plip_driver)) {
|
||
printk (KERN_WARNING "plip: couldn't register driver\n");
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
module_init(plip_init);
|
||
module_exit(plip_cleanup_module);
|
||
MODULE_LICENSE("GPL");
|
||
|
||
/*
|
||
* Local variables:
|
||
* compile-command: "gcc -DMODULE -DMODVERSIONS -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -g -fomit-frame-pointer -pipe -c plip.c"
|
||
* End:
|
||
*/
|