litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'drivers/ata/pata_hpt3x2n.c')

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/* $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/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/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; }; static inline 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); } } static inline 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); } } static inline 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); } static inline 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 */ static inline 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 __be16 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;


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