Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: plip.c,v 1.3.6.2 1997/04/16 15:07:56 phil Exp $ */ |
| 2 | /* PLIP: A parallel port "network" driver for Linux. */ |
| 3 | /* This driver is for parallel port with 5-bit cable (LapLink (R) cable). */ |
| 4 | /* |
| 5 | * Authors: Donald Becker <becker@scyld.com> |
| 6 | * Tommy Thorn <thorn@daimi.aau.dk> |
| 7 | * Tanabe Hiroyasu <hiro@sanpo.t.u-tokyo.ac.jp> |
| 8 | * Alan Cox <gw4pts@gw4pts.ampr.org> |
| 9 | * Peter Bauer <100136.3530@compuserve.com> |
| 10 | * Niibe Yutaka <gniibe@mri.co.jp> |
| 11 | * Nimrod Zimerman <zimerman@mailandnews.com> |
| 12 | * |
| 13 | * Enhancements: |
| 14 | * Modularization and ifreq/ifmap support by Alan Cox. |
| 15 | * Rewritten by Niibe Yutaka. |
| 16 | * parport-sharing awareness code by Philip Blundell. |
| 17 | * SMP locking by Niibe Yutaka. |
| 18 | * Support for parallel ports with no IRQ (poll mode), |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 19 | * Modifications to use the parallel port API |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * by Nimrod Zimerman. |
| 21 | * |
| 22 | * Fixes: |
| 23 | * Niibe Yutaka |
| 24 | * - Module initialization. |
| 25 | * - MTU fix. |
| 26 | * - Make sure other end is OK, before sending a packet. |
| 27 | * - Fix immediate timer problem. |
| 28 | * |
| 29 | * Al Viro |
| 30 | * - Changed {enable,disable}_irq handling to make it work |
| 31 | * with new ("stack") semantics. |
| 32 | * |
| 33 | * This program is free software; you can redistribute it and/or |
| 34 | * modify it under the terms of the GNU General Public License |
| 35 | * as published by the Free Software Foundation; either version |
| 36 | * 2 of the License, or (at your option) any later version. |
| 37 | */ |
| 38 | |
| 39 | /* |
| 40 | * Original version and the name 'PLIP' from Donald Becker <becker@scyld.com> |
| 41 | * inspired by Russ Nelson's parallel port packet driver. |
| 42 | * |
| 43 | * NOTE: |
| 44 | * Tanabe Hiroyasu had changed the protocol, and it was in Linux v1.0. |
| 45 | * Because of the necessity to communicate to DOS machines with the |
| 46 | * Crynwr packet driver, Peter Bauer changed the protocol again |
| 47 | * back to original protocol. |
| 48 | * |
| 49 | * This version follows original PLIP protocol. |
| 50 | * So, this PLIP can't communicate the PLIP of Linux v1.0. |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * To use with DOS box, please do (Turn on ARP switch): |
| 55 | * # ifconfig plip[0-2] arp |
| 56 | */ |
| 57 | static const char version[] = "NET3 PLIP version 2.4-parport gniibe@mri.co.jp\n"; |
| 58 | |
| 59 | /* |
| 60 | Sources: |
| 61 | Ideas and protocols came from Russ Nelson's <nelson@crynwr.com> |
| 62 | "parallel.asm" parallel port packet driver. |
| 63 | |
| 64 | The "Crynwr" parallel port standard specifies the following protocol: |
| 65 | Trigger by sending nibble '0x8' (this causes interrupt on other end) |
| 66 | count-low octet |
| 67 | count-high octet |
| 68 | ... data octets |
| 69 | checksum octet |
| 70 | Each octet is sent as <wait for rx. '0x1?'> <send 0x10+(octet&0x0F)> |
| 71 | <wait for rx. '0x0?'> <send 0x00+((octet>>4)&0x0F)> |
| 72 | |
| 73 | The packet is encapsulated as if it were ethernet. |
| 74 | |
| 75 | The cable used is a de facto standard parallel null cable -- sold as |
| 76 | a "LapLink" cable by various places. You'll need a 12-conductor cable to |
| 77 | make one yourself. The wiring is: |
| 78 | SLCTIN 17 - 17 |
| 79 | GROUND 25 - 25 |
| 80 | D0->ERROR 2 - 15 15 - 2 |
| 81 | D1->SLCT 3 - 13 13 - 3 |
| 82 | D2->PAPOUT 4 - 12 12 - 4 |
| 83 | D3->ACK 5 - 10 10 - 5 |
| 84 | D4->BUSY 6 - 11 11 - 6 |
| 85 | Do not connect the other pins. They are |
| 86 | D5,D6,D7 are 7,8,9 |
| 87 | STROBE is 1, FEED is 14, INIT is 16 |
| 88 | extra grounds are 18,19,20,21,22,23,24 |
| 89 | */ |
| 90 | |
| 91 | #include <linux/module.h> |
| 92 | #include <linux/kernel.h> |
| 93 | #include <linux/types.h> |
| 94 | #include <linux/fcntl.h> |
| 95 | #include <linux/interrupt.h> |
| 96 | #include <linux/string.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 97 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <linux/if_ether.h> |
| 99 | #include <linux/in.h> |
| 100 | #include <linux/errno.h> |
| 101 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #include <linux/init.h> |
| 103 | #include <linux/netdevice.h> |
| 104 | #include <linux/etherdevice.h> |
| 105 | #include <linux/inetdevice.h> |
| 106 | #include <linux/skbuff.h> |
| 107 | #include <linux/if_plip.h> |
| 108 | #include <linux/workqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #include <linux/spinlock.h> |
Matthias Kaehlcke | 01f31ac | 2007-12-13 16:03:00 -0800 | [diff] [blame] | 110 | #include <linux/completion.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | #include <linux/parport.h> |
| 112 | #include <linux/bitops.h> |
| 113 | |
| 114 | #include <net/neighbour.h> |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #include <asm/irq.h> |
| 117 | #include <asm/byteorder.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | /* Maximum number of devices to support. */ |
| 120 | #define PLIP_MAX 8 |
| 121 | |
| 122 | /* Use 0 for production, 1 for verification, >2 for debug */ |
| 123 | #ifndef NET_DEBUG |
| 124 | #define NET_DEBUG 1 |
| 125 | #endif |
Arjan van de Ven | f71e130 | 2006-03-03 21:33:57 -0500 | [diff] [blame] | 126 | static const unsigned int net_debug = NET_DEBUG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | #define ENABLE(irq) if (irq != -1) enable_irq(irq) |
| 129 | #define DISABLE(irq) if (irq != -1) disable_irq(irq) |
| 130 | |
| 131 | /* In micro second */ |
| 132 | #define PLIP_DELAY_UNIT 1 |
| 133 | |
| 134 | /* Connection time out = PLIP_TRIGGER_WAIT * PLIP_DELAY_UNIT usec */ |
| 135 | #define PLIP_TRIGGER_WAIT 500 |
| 136 | |
| 137 | /* Nibble time out = PLIP_NIBBLE_WAIT * PLIP_DELAY_UNIT usec */ |
| 138 | #define PLIP_NIBBLE_WAIT 3000 |
| 139 | |
| 140 | /* Bottom halves */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 141 | static void plip_kick_bh(struct work_struct *work); |
| 142 | static void plip_bh(struct work_struct *work); |
| 143 | static void plip_timer_bh(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* Interrupt handler */ |
Jeff Garzik | 5712cb3 | 2007-10-19 02:54:26 -0400 | [diff] [blame] | 146 | static void plip_interrupt(void *dev_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | /* Functions for DEV methods */ |
| 149 | static int plip_tx_packet(struct sk_buff *skb, struct net_device *dev); |
| 150 | static int plip_hard_header(struct sk_buff *skb, struct net_device *dev, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 151 | unsigned short type, const void *daddr, |
| 152 | const void *saddr, unsigned len); |
| 153 | static int plip_hard_header_cache(const struct neighbour *neigh, |
David S. Miller | e69dd33 | 2011-07-12 23:28:12 -0700 | [diff] [blame] | 154 | struct hh_cache *hh, __be16 type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | static int plip_open(struct net_device *dev); |
| 156 | static int plip_close(struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | static int plip_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); |
| 158 | static int plip_preempt(void *handle); |
| 159 | static void plip_wakeup(void *handle); |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | enum plip_connection_state { |
| 162 | PLIP_CN_NONE=0, |
| 163 | PLIP_CN_RECEIVE, |
| 164 | PLIP_CN_SEND, |
| 165 | PLIP_CN_CLOSING, |
| 166 | PLIP_CN_ERROR |
| 167 | }; |
| 168 | |
| 169 | enum plip_packet_state { |
| 170 | PLIP_PK_DONE=0, |
| 171 | PLIP_PK_TRIGGER, |
| 172 | PLIP_PK_LENGTH_LSB, |
| 173 | PLIP_PK_LENGTH_MSB, |
| 174 | PLIP_PK_DATA, |
| 175 | PLIP_PK_CHECKSUM |
| 176 | }; |
| 177 | |
| 178 | enum plip_nibble_state { |
| 179 | PLIP_NB_BEGIN, |
| 180 | PLIP_NB_1, |
| 181 | PLIP_NB_2, |
| 182 | }; |
| 183 | |
| 184 | struct plip_local { |
| 185 | enum plip_packet_state state; |
| 186 | enum plip_nibble_state nibble; |
| 187 | union { |
| 188 | struct { |
| 189 | #if defined(__LITTLE_ENDIAN) |
| 190 | unsigned char lsb; |
| 191 | unsigned char msb; |
| 192 | #elif defined(__BIG_ENDIAN) |
| 193 | unsigned char msb; |
| 194 | unsigned char lsb; |
| 195 | #else |
| 196 | #error "Please fix the endianness defines in <asm/byteorder.h>" |
| 197 | #endif |
| 198 | } b; |
| 199 | unsigned short h; |
| 200 | } length; |
| 201 | unsigned short byte; |
| 202 | unsigned char checksum; |
| 203 | unsigned char data; |
| 204 | struct sk_buff *skb; |
| 205 | }; |
| 206 | |
| 207 | struct net_local { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 208 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | struct work_struct immediate; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 210 | struct delayed_work deferred; |
| 211 | struct delayed_work timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | struct plip_local snd_data; |
| 213 | struct plip_local rcv_data; |
| 214 | struct pardevice *pardev; |
| 215 | unsigned long trigger; |
| 216 | unsigned long nibble; |
| 217 | enum plip_connection_state connection; |
| 218 | unsigned short timeout_count; |
| 219 | int is_deferred; |
| 220 | int port_owner; |
| 221 | int should_relinquish; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | spinlock_t lock; |
| 223 | atomic_t kill_timer; |
Matthias Kaehlcke | 01f31ac | 2007-12-13 16:03:00 -0800 | [diff] [blame] | 224 | struct completion killed_timer_cmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | }; |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 226 | |
| 227 | static inline void enable_parport_interrupts (struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | if (dev->irq != -1) |
| 230 | { |
| 231 | struct parport *port = |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 232 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | port->ops->enable_irq (port); |
| 234 | } |
| 235 | } |
| 236 | |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 237 | static inline void disable_parport_interrupts (struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | { |
| 239 | if (dev->irq != -1) |
| 240 | { |
| 241 | struct parport *port = |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 242 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | port->ops->disable_irq (port); |
| 244 | } |
| 245 | } |
| 246 | |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 247 | static inline void write_data (struct net_device *dev, unsigned char data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
| 249 | struct parport *port = |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 250 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | port->ops->write_data (port, data); |
| 253 | } |
| 254 | |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 255 | static inline unsigned char read_status (struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
| 257 | struct parport *port = |
Wang Chen | 4cf1653 | 2008-11-12 23:38:14 -0800 | [diff] [blame] | 258 | ((struct net_local *)netdev_priv(dev))->pardev->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | return port->ops->read_status (port); |
| 261 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 262 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 263 | static const struct header_ops plip_header_ops = { |
| 264 | .create = plip_hard_header, |
| 265 | .cache = plip_hard_header_cache, |
| 266 | }; |
| 267 | |
Stephen Hemminger | ed8cf43 | 2009-01-07 17:26:48 -0800 | [diff] [blame] | 268 | static const struct net_device_ops plip_netdev_ops = { |
| 269 | .ndo_open = plip_open, |
| 270 | .ndo_stop = plip_close, |
| 271 | .ndo_start_xmit = plip_tx_packet, |
| 272 | .ndo_do_ioctl = plip_ioctl, |
Ben Hutchings | 635ecaa | 2009-07-09 17:59:01 +0000 | [diff] [blame] | 273 | .ndo_change_mtu = eth_change_mtu, |
Ben Hutchings | 240c102 | 2009-07-09 17:54:35 +0000 | [diff] [blame] | 274 | .ndo_set_mac_address = eth_mac_addr, |
| 275 | .ndo_validate_addr = eth_validate_addr, |
Stephen Hemminger | ed8cf43 | 2009-01-07 17:26:48 -0800 | [diff] [blame] | 276 | }; |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | /* Entry point of PLIP driver. |
| 279 | Probe the hardware, and register/initialize the driver. |
| 280 | |
| 281 | PLIP is rather weird, because of the way it interacts with the parport |
| 282 | system. It is _not_ initialised from Space.c. Instead, plip_init() |
| 283 | is called, and that function makes up a "struct net_device" for each port, and |
| 284 | then calls us here. |
| 285 | |
| 286 | */ |
| 287 | static void |
| 288 | plip_init_netdev(struct net_device *dev) |
| 289 | { |
| 290 | struct net_local *nl = netdev_priv(dev); |
| 291 | |
| 292 | /* Then, override parts of it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | dev->tx_queue_len = 10; |
| 294 | dev->flags = IFF_POINTOPOINT|IFF_NOARP; |
| 295 | memset(dev->dev_addr, 0xfc, ETH_ALEN); |
| 296 | |
Stephen Hemminger | ed8cf43 | 2009-01-07 17:26:48 -0800 | [diff] [blame] | 297 | dev->netdev_ops = &plip_netdev_ops; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 298 | dev->header_ops = &plip_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | |
| 301 | nl->port_owner = 0; |
| 302 | |
| 303 | /* Initialize constants */ |
| 304 | nl->trigger = PLIP_TRIGGER_WAIT; |
| 305 | nl->nibble = PLIP_NIBBLE_WAIT; |
| 306 | |
| 307 | /* Initialize task queue structures */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 308 | INIT_WORK(&nl->immediate, plip_bh); |
| 309 | INIT_DELAYED_WORK(&nl->deferred, plip_kick_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | if (dev->irq == -1) |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 312 | INIT_DELAYED_WORK(&nl->timer, plip_timer_bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | spin_lock_init(&nl->lock); |
| 315 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | /* Bottom half handler for the delayed request. |
| 318 | This routine is kicked by do_timer(). |
| 319 | Request `plip_bh' to be invoked. */ |
| 320 | static void |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 321 | plip_kick_bh(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 323 | struct net_local *nl = |
| 324 | container_of(work, struct net_local, deferred.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | if (nl->is_deferred) |
| 327 | schedule_work(&nl->immediate); |
| 328 | } |
| 329 | |
| 330 | /* Forward declarations of internal routines */ |
| 331 | static int plip_none(struct net_device *, struct net_local *, |
| 332 | struct plip_local *, struct plip_local *); |
| 333 | static int plip_receive_packet(struct net_device *, struct net_local *, |
| 334 | struct plip_local *, struct plip_local *); |
| 335 | static int plip_send_packet(struct net_device *, struct net_local *, |
| 336 | struct plip_local *, struct plip_local *); |
| 337 | static int plip_connection_close(struct net_device *, struct net_local *, |
| 338 | struct plip_local *, struct plip_local *); |
| 339 | static int plip_error(struct net_device *, struct net_local *, |
| 340 | struct plip_local *, struct plip_local *); |
| 341 | static int plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, |
| 342 | struct plip_local *snd, |
| 343 | struct plip_local *rcv, |
| 344 | int error); |
| 345 | |
| 346 | #define OK 0 |
| 347 | #define TIMEOUT 1 |
| 348 | #define ERROR 2 |
| 349 | #define HS_TIMEOUT 3 |
| 350 | |
| 351 | typedef int (*plip_func)(struct net_device *dev, struct net_local *nl, |
| 352 | struct plip_local *snd, struct plip_local *rcv); |
| 353 | |
Arjan van de Ven | f71e130 | 2006-03-03 21:33:57 -0500 | [diff] [blame] | 354 | static const plip_func connection_state_table[] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | { |
| 356 | plip_none, |
| 357 | plip_receive_packet, |
| 358 | plip_send_packet, |
| 359 | plip_connection_close, |
| 360 | plip_error |
| 361 | }; |
| 362 | |
| 363 | /* Bottom half handler of PLIP. */ |
| 364 | static void |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 365 | plip_bh(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 367 | struct net_local *nl = container_of(work, struct net_local, immediate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | struct plip_local *snd = &nl->snd_data; |
| 369 | struct plip_local *rcv = &nl->rcv_data; |
| 370 | plip_func f; |
| 371 | int r; |
| 372 | |
| 373 | nl->is_deferred = 0; |
| 374 | f = connection_state_table[nl->connection]; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 375 | if ((r = (*f)(nl->dev, nl, snd, rcv)) != OK && |
| 376 | (r = plip_bh_timeout_error(nl->dev, nl, snd, rcv, r)) != OK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | nl->is_deferred = 1; |
| 378 | schedule_delayed_work(&nl->deferred, 1); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static void |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 383 | plip_timer_bh(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 385 | struct net_local *nl = |
| 386 | container_of(work, struct net_local, timer.work); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | if (!(atomic_read (&nl->kill_timer))) { |
Jeff Garzik | 5712cb3 | 2007-10-19 02:54:26 -0400 | [diff] [blame] | 389 | plip_interrupt (nl->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | schedule_delayed_work(&nl->timer, 1); |
| 392 | } |
| 393 | else { |
Matthias Kaehlcke | 01f31ac | 2007-12-13 16:03:00 -0800 | [diff] [blame] | 394 | complete(&nl->killed_timer_cmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | } |
| 397 | |
| 398 | static int |
| 399 | plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, |
| 400 | struct plip_local *snd, struct plip_local *rcv, |
| 401 | int error) |
| 402 | { |
| 403 | unsigned char c0; |
| 404 | /* |
| 405 | * This is tricky. If we got here from the beginning of send (either |
| 406 | * with ERROR or HS_TIMEOUT) we have IRQ enabled. Otherwise it's |
| 407 | * already disabled. With the old variant of {enable,disable}_irq() |
| 408 | * extra disable_irq() was a no-op. Now it became mortal - it's |
| 409 | * unbalanced and thus we'll never re-enable IRQ (until rmmod plip, |
| 410 | * that is). So we have to treat HS_TIMEOUT and ERROR from send |
| 411 | * in a special way. |
| 412 | */ |
| 413 | |
| 414 | spin_lock_irq(&nl->lock); |
| 415 | if (nl->connection == PLIP_CN_SEND) { |
| 416 | |
| 417 | if (error != ERROR) { /* Timeout */ |
| 418 | nl->timeout_count++; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 419 | if ((error == HS_TIMEOUT && nl->timeout_count <= 10) || |
| 420 | nl->timeout_count <= 3) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | spin_unlock_irq(&nl->lock); |
| 422 | /* Try again later */ |
| 423 | return TIMEOUT; |
| 424 | } |
| 425 | c0 = read_status(dev); |
| 426 | printk(KERN_WARNING "%s: transmit timeout(%d,%02x)\n", |
| 427 | dev->name, snd->state, c0); |
| 428 | } else |
| 429 | error = HS_TIMEOUT; |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 430 | dev->stats.tx_errors++; |
| 431 | dev->stats.tx_aborted_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } else if (nl->connection == PLIP_CN_RECEIVE) { |
| 433 | if (rcv->state == PLIP_PK_TRIGGER) { |
| 434 | /* Transmission was interrupted. */ |
| 435 | spin_unlock_irq(&nl->lock); |
| 436 | return OK; |
| 437 | } |
| 438 | if (error != ERROR) { /* Timeout */ |
| 439 | if (++nl->timeout_count <= 3) { |
| 440 | spin_unlock_irq(&nl->lock); |
| 441 | /* Try again later */ |
| 442 | return TIMEOUT; |
| 443 | } |
| 444 | c0 = read_status(dev); |
| 445 | printk(KERN_WARNING "%s: receive timeout(%d,%02x)\n", |
| 446 | dev->name, rcv->state, c0); |
| 447 | } |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 448 | dev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | rcv->state = PLIP_PK_DONE; |
| 451 | if (rcv->skb) { |
| 452 | kfree_skb(rcv->skb); |
| 453 | rcv->skb = NULL; |
| 454 | } |
| 455 | snd->state = PLIP_PK_DONE; |
| 456 | if (snd->skb) { |
| 457 | dev_kfree_skb(snd->skb); |
| 458 | snd->skb = NULL; |
| 459 | } |
| 460 | spin_unlock_irq(&nl->lock); |
| 461 | if (error == HS_TIMEOUT) { |
| 462 | DISABLE(dev->irq); |
| 463 | synchronize_irq(dev->irq); |
| 464 | } |
| 465 | disable_parport_interrupts (dev); |
| 466 | netif_stop_queue (dev); |
| 467 | nl->connection = PLIP_CN_ERROR; |
| 468 | write_data (dev, 0x00); |
| 469 | |
| 470 | return TIMEOUT; |
| 471 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | static int |
| 474 | plip_none(struct net_device *dev, struct net_local *nl, |
| 475 | struct plip_local *snd, struct plip_local *rcv) |
| 476 | { |
| 477 | return OK; |
| 478 | } |
| 479 | |
| 480 | /* PLIP_RECEIVE --- receive a byte(two nibbles) |
| 481 | Returns OK on success, TIMEOUT on timeout */ |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 482 | static inline int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | plip_receive(unsigned short nibble_timeout, struct net_device *dev, |
| 484 | enum plip_nibble_state *ns_p, unsigned char *data_p) |
| 485 | { |
| 486 | unsigned char c0, c1; |
| 487 | unsigned int cx; |
| 488 | |
| 489 | switch (*ns_p) { |
| 490 | case PLIP_NB_BEGIN: |
| 491 | cx = nibble_timeout; |
| 492 | while (1) { |
| 493 | c0 = read_status(dev); |
| 494 | udelay(PLIP_DELAY_UNIT); |
| 495 | if ((c0 & 0x80) == 0) { |
| 496 | c1 = read_status(dev); |
| 497 | if (c0 == c1) |
| 498 | break; |
| 499 | } |
| 500 | if (--cx == 0) |
| 501 | return TIMEOUT; |
| 502 | } |
| 503 | *data_p = (c0 >> 3) & 0x0f; |
| 504 | write_data (dev, 0x10); /* send ACK */ |
| 505 | *ns_p = PLIP_NB_1; |
| 506 | |
| 507 | case PLIP_NB_1: |
| 508 | cx = nibble_timeout; |
| 509 | while (1) { |
| 510 | c0 = read_status(dev); |
| 511 | udelay(PLIP_DELAY_UNIT); |
| 512 | if (c0 & 0x80) { |
| 513 | c1 = read_status(dev); |
| 514 | if (c0 == c1) |
| 515 | break; |
| 516 | } |
| 517 | if (--cx == 0) |
| 518 | return TIMEOUT; |
| 519 | } |
| 520 | *data_p |= (c0 << 1) & 0xf0; |
| 521 | write_data (dev, 0x00); /* send ACK */ |
| 522 | *ns_p = PLIP_NB_BEGIN; |
| 523 | case PLIP_NB_2: |
| 524 | break; |
| 525 | } |
| 526 | return OK; |
| 527 | } |
| 528 | |
| 529 | /* |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 530 | * Determine the packet's protocol ID. The rule here is that we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | * assume 802.3 if the type field is short enough to be a length. |
| 532 | * This is normal practice and works for any 'now in use' protocol. |
| 533 | * |
| 534 | * PLIP is ethernet ish but the daddr might not be valid if unicast. |
| 535 | * PLIP fortunately has no bus architecture (its Point-to-point). |
| 536 | * |
| 537 | * We can't fix the daddr thing as that quirk (more bug) is embedded |
| 538 | * in far too many old systems not all even running Linux. |
| 539 | */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 540 | |
Alexey Dobriyan | ab61148 | 2005-07-12 12:08:43 -0700 | [diff] [blame] | 541 | static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
| 543 | struct ethhdr *eth; |
| 544 | unsigned char *rawp; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 545 | |
Arnaldo Carvalho de Melo | 98e399f | 2007-03-19 15:33:04 -0700 | [diff] [blame] | 546 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | skb_pull(skb,dev->hard_header_len); |
| 548 | eth = eth_hdr(skb); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 549 | |
dingtianhong | 2d87650 | 2013-12-30 15:41:33 +0800 | [diff] [blame] | 550 | if(is_multicast_ether_addr(eth->h_dest)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | { |
dingtianhong | 2d87650 | 2013-12-30 15:41:33 +0800 | [diff] [blame] | 552 | if(ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | skb->pkt_type=PACKET_BROADCAST; |
| 554 | else |
| 555 | skb->pkt_type=PACKET_MULTICAST; |
| 556 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | /* |
| 559 | * This ALLMULTI check should be redundant by 1.4 |
| 560 | * so don't forget to remove it. |
| 561 | */ |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 562 | |
Simon Horman | e5c5d22 | 2013-03-28 13:38:25 +0900 | [diff] [blame] | 563 | if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return eth->h_proto; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | rawp = skb->data; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | /* |
| 569 | * This is a magic hack to spot IPX packets. Older Novell breaks |
| 570 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC |
| 571 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This |
| 572 | * won't work for fault tolerant netware but does for the rest. |
| 573 | */ |
| 574 | if (*(unsigned short *)rawp == 0xFFFF) |
| 575 | return htons(ETH_P_802_3); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | /* |
| 578 | * Real 802.2 LLC |
| 579 | */ |
| 580 | return htons(ETH_P_802_2); |
| 581 | } |
| 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | /* PLIP_RECEIVE_PACKET --- receive a packet */ |
| 584 | static int |
| 585 | plip_receive_packet(struct net_device *dev, struct net_local *nl, |
| 586 | struct plip_local *snd, struct plip_local *rcv) |
| 587 | { |
| 588 | unsigned short nibble_timeout = nl->nibble; |
| 589 | unsigned char *lbuf; |
| 590 | |
| 591 | switch (rcv->state) { |
| 592 | case PLIP_PK_TRIGGER: |
| 593 | DISABLE(dev->irq); |
| 594 | /* Don't need to synchronize irq, as we can safely ignore it */ |
| 595 | disable_parport_interrupts (dev); |
| 596 | write_data (dev, 0x01); /* send ACK */ |
| 597 | if (net_debug > 2) |
| 598 | printk(KERN_DEBUG "%s: receive start\n", dev->name); |
| 599 | rcv->state = PLIP_PK_LENGTH_LSB; |
| 600 | rcv->nibble = PLIP_NB_BEGIN; |
| 601 | |
| 602 | case PLIP_PK_LENGTH_LSB: |
| 603 | if (snd->state != PLIP_PK_DONE) { |
| 604 | if (plip_receive(nl->trigger, dev, |
| 605 | &rcv->nibble, &rcv->length.b.lsb)) { |
| 606 | /* collision, here dev->tbusy == 1 */ |
| 607 | rcv->state = PLIP_PK_DONE; |
| 608 | nl->is_deferred = 1; |
| 609 | nl->connection = PLIP_CN_SEND; |
| 610 | schedule_delayed_work(&nl->deferred, 1); |
| 611 | enable_parport_interrupts (dev); |
| 612 | ENABLE(dev->irq); |
| 613 | return OK; |
| 614 | } |
| 615 | } else { |
| 616 | if (plip_receive(nibble_timeout, dev, |
| 617 | &rcv->nibble, &rcv->length.b.lsb)) |
| 618 | return TIMEOUT; |
| 619 | } |
| 620 | rcv->state = PLIP_PK_LENGTH_MSB; |
| 621 | |
| 622 | case PLIP_PK_LENGTH_MSB: |
| 623 | if (plip_receive(nibble_timeout, dev, |
| 624 | &rcv->nibble, &rcv->length.b.msb)) |
| 625 | return TIMEOUT; |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 626 | if (rcv->length.h > dev->mtu + dev->hard_header_len || |
| 627 | rcv->length.h < 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | printk(KERN_WARNING "%s: bogus packet size %d.\n", dev->name, rcv->length.h); |
| 629 | return ERROR; |
| 630 | } |
| 631 | /* Malloc up new buffer. */ |
| 632 | rcv->skb = dev_alloc_skb(rcv->length.h + 2); |
| 633 | if (rcv->skb == NULL) { |
| 634 | printk(KERN_ERR "%s: Memory squeeze.\n", dev->name); |
| 635 | return ERROR; |
| 636 | } |
| 637 | skb_reserve(rcv->skb, 2); /* Align IP on 16 byte boundaries */ |
| 638 | skb_put(rcv->skb,rcv->length.h); |
| 639 | rcv->skb->dev = dev; |
| 640 | rcv->state = PLIP_PK_DATA; |
| 641 | rcv->byte = 0; |
| 642 | rcv->checksum = 0; |
| 643 | |
| 644 | case PLIP_PK_DATA: |
| 645 | lbuf = rcv->skb->data; |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 646 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | if (plip_receive(nibble_timeout, dev, |
| 648 | &rcv->nibble, &lbuf[rcv->byte])) |
| 649 | return TIMEOUT; |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 650 | } while (++rcv->byte < rcv->length.h); |
| 651 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | rcv->checksum += lbuf[--rcv->byte]; |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 653 | } while (rcv->byte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | rcv->state = PLIP_PK_CHECKSUM; |
| 655 | |
| 656 | case PLIP_PK_CHECKSUM: |
| 657 | if (plip_receive(nibble_timeout, dev, |
| 658 | &rcv->nibble, &rcv->data)) |
| 659 | return TIMEOUT; |
| 660 | if (rcv->data != rcv->checksum) { |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 661 | dev->stats.rx_crc_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (net_debug) |
| 663 | printk(KERN_DEBUG "%s: checksum error\n", dev->name); |
| 664 | return ERROR; |
| 665 | } |
| 666 | rcv->state = PLIP_PK_DONE; |
| 667 | |
| 668 | case PLIP_PK_DONE: |
| 669 | /* Inform the upper layer for the arrival of a packet. */ |
| 670 | rcv->skb->protocol=plip_type_trans(rcv->skb, dev); |
Mikulas Patocka | f6ce5cc | 2007-11-22 21:19:39 +0100 | [diff] [blame] | 671 | netif_rx_ni(rcv->skb); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 672 | dev->stats.rx_bytes += rcv->length.h; |
| 673 | dev->stats.rx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | rcv->skb = NULL; |
| 675 | if (net_debug > 2) |
| 676 | printk(KERN_DEBUG "%s: receive end\n", dev->name); |
| 677 | |
| 678 | /* Close the connection. */ |
| 679 | write_data (dev, 0x00); |
| 680 | spin_lock_irq(&nl->lock); |
| 681 | if (snd->state != PLIP_PK_DONE) { |
| 682 | nl->connection = PLIP_CN_SEND; |
| 683 | spin_unlock_irq(&nl->lock); |
| 684 | schedule_work(&nl->immediate); |
| 685 | enable_parport_interrupts (dev); |
| 686 | ENABLE(dev->irq); |
| 687 | return OK; |
| 688 | } else { |
| 689 | nl->connection = PLIP_CN_NONE; |
| 690 | spin_unlock_irq(&nl->lock); |
| 691 | enable_parport_interrupts (dev); |
| 692 | ENABLE(dev->irq); |
| 693 | return OK; |
| 694 | } |
| 695 | } |
| 696 | return OK; |
| 697 | } |
| 698 | |
| 699 | /* PLIP_SEND --- send a byte (two nibbles) |
| 700 | Returns OK on success, TIMEOUT when timeout */ |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 701 | static inline int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | plip_send(unsigned short nibble_timeout, struct net_device *dev, |
| 703 | enum plip_nibble_state *ns_p, unsigned char data) |
| 704 | { |
| 705 | unsigned char c0; |
| 706 | unsigned int cx; |
| 707 | |
| 708 | switch (*ns_p) { |
| 709 | case PLIP_NB_BEGIN: |
| 710 | write_data (dev, data & 0x0f); |
| 711 | *ns_p = PLIP_NB_1; |
| 712 | |
| 713 | case PLIP_NB_1: |
| 714 | write_data (dev, 0x10 | (data & 0x0f)); |
| 715 | cx = nibble_timeout; |
| 716 | while (1) { |
| 717 | c0 = read_status(dev); |
| 718 | if ((c0 & 0x80) == 0) |
| 719 | break; |
| 720 | if (--cx == 0) |
| 721 | return TIMEOUT; |
| 722 | udelay(PLIP_DELAY_UNIT); |
| 723 | } |
| 724 | write_data (dev, 0x10 | (data >> 4)); |
| 725 | *ns_p = PLIP_NB_2; |
| 726 | |
| 727 | case PLIP_NB_2: |
| 728 | write_data (dev, (data >> 4)); |
| 729 | cx = nibble_timeout; |
| 730 | while (1) { |
| 731 | c0 = read_status(dev); |
| 732 | if (c0 & 0x80) |
| 733 | break; |
| 734 | if (--cx == 0) |
| 735 | return TIMEOUT; |
| 736 | udelay(PLIP_DELAY_UNIT); |
| 737 | } |
| 738 | *ns_p = PLIP_NB_BEGIN; |
| 739 | return OK; |
| 740 | } |
| 741 | return OK; |
| 742 | } |
| 743 | |
| 744 | /* PLIP_SEND_PACKET --- send a packet */ |
| 745 | static int |
| 746 | plip_send_packet(struct net_device *dev, struct net_local *nl, |
| 747 | struct plip_local *snd, struct plip_local *rcv) |
| 748 | { |
| 749 | unsigned short nibble_timeout = nl->nibble; |
| 750 | unsigned char *lbuf; |
| 751 | unsigned char c0; |
| 752 | unsigned int cx; |
| 753 | |
| 754 | if (snd->skb == NULL || (lbuf = snd->skb->data) == NULL) { |
| 755 | printk(KERN_DEBUG "%s: send skb lost\n", dev->name); |
| 756 | snd->state = PLIP_PK_DONE; |
| 757 | snd->skb = NULL; |
| 758 | return ERROR; |
| 759 | } |
| 760 | |
| 761 | switch (snd->state) { |
| 762 | case PLIP_PK_TRIGGER: |
| 763 | if ((read_status(dev) & 0xf8) != 0x80) |
| 764 | return HS_TIMEOUT; |
| 765 | |
| 766 | /* Trigger remote rx interrupt. */ |
| 767 | write_data (dev, 0x08); |
| 768 | cx = nl->trigger; |
| 769 | while (1) { |
| 770 | udelay(PLIP_DELAY_UNIT); |
| 771 | spin_lock_irq(&nl->lock); |
| 772 | if (nl->connection == PLIP_CN_RECEIVE) { |
| 773 | spin_unlock_irq(&nl->lock); |
| 774 | /* Interrupted. */ |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 775 | dev->stats.collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | return OK; |
| 777 | } |
| 778 | c0 = read_status(dev); |
| 779 | if (c0 & 0x08) { |
| 780 | spin_unlock_irq(&nl->lock); |
| 781 | DISABLE(dev->irq); |
| 782 | synchronize_irq(dev->irq); |
| 783 | if (nl->connection == PLIP_CN_RECEIVE) { |
| 784 | /* Interrupted. |
| 785 | We don't need to enable irq, |
| 786 | as it is soon disabled. */ |
| 787 | /* Yes, we do. New variant of |
| 788 | {enable,disable}_irq *counts* |
| 789 | them. -- AV */ |
| 790 | ENABLE(dev->irq); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 791 | dev->stats.collisions++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return OK; |
| 793 | } |
| 794 | disable_parport_interrupts (dev); |
| 795 | if (net_debug > 2) |
| 796 | printk(KERN_DEBUG "%s: send start\n", dev->name); |
| 797 | snd->state = PLIP_PK_LENGTH_LSB; |
| 798 | snd->nibble = PLIP_NB_BEGIN; |
| 799 | nl->timeout_count = 0; |
| 800 | break; |
| 801 | } |
| 802 | spin_unlock_irq(&nl->lock); |
| 803 | if (--cx == 0) { |
| 804 | write_data (dev, 0x00); |
| 805 | return HS_TIMEOUT; |
| 806 | } |
| 807 | } |
| 808 | |
| 809 | case PLIP_PK_LENGTH_LSB: |
| 810 | if (plip_send(nibble_timeout, dev, |
| 811 | &snd->nibble, snd->length.b.lsb)) |
| 812 | return TIMEOUT; |
| 813 | snd->state = PLIP_PK_LENGTH_MSB; |
| 814 | |
| 815 | case PLIP_PK_LENGTH_MSB: |
| 816 | if (plip_send(nibble_timeout, dev, |
| 817 | &snd->nibble, snd->length.b.msb)) |
| 818 | return TIMEOUT; |
| 819 | snd->state = PLIP_PK_DATA; |
| 820 | snd->byte = 0; |
| 821 | snd->checksum = 0; |
| 822 | |
| 823 | case PLIP_PK_DATA: |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 824 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | if (plip_send(nibble_timeout, dev, |
| 826 | &snd->nibble, lbuf[snd->byte])) |
| 827 | return TIMEOUT; |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 828 | } while (++snd->byte < snd->length.h); |
| 829 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | snd->checksum += lbuf[--snd->byte]; |
Hannes Eder | e4c3c13 | 2008-12-25 23:55:35 -0800 | [diff] [blame] | 831 | } while (snd->byte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | snd->state = PLIP_PK_CHECKSUM; |
| 833 | |
| 834 | case PLIP_PK_CHECKSUM: |
| 835 | if (plip_send(nibble_timeout, dev, |
| 836 | &snd->nibble, snd->checksum)) |
| 837 | return TIMEOUT; |
| 838 | |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 839 | dev->stats.tx_bytes += snd->skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | dev_kfree_skb(snd->skb); |
Jeff Garzik | 09f75cd | 2007-10-03 17:41:50 -0700 | [diff] [blame] | 841 | dev->stats.tx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | snd->state = PLIP_PK_DONE; |
| 843 | |
| 844 | case PLIP_PK_DONE: |
| 845 | /* Close the connection */ |
| 846 | write_data (dev, 0x00); |
| 847 | snd->skb = NULL; |
| 848 | if (net_debug > 2) |
| 849 | printk(KERN_DEBUG "%s: send end\n", dev->name); |
| 850 | nl->connection = PLIP_CN_CLOSING; |
| 851 | nl->is_deferred = 1; |
| 852 | schedule_delayed_work(&nl->deferred, 1); |
| 853 | enable_parport_interrupts (dev); |
| 854 | ENABLE(dev->irq); |
| 855 | return OK; |
| 856 | } |
| 857 | return OK; |
| 858 | } |
| 859 | |
| 860 | static int |
| 861 | plip_connection_close(struct net_device *dev, struct net_local *nl, |
| 862 | struct plip_local *snd, struct plip_local *rcv) |
| 863 | { |
| 864 | spin_lock_irq(&nl->lock); |
| 865 | if (nl->connection == PLIP_CN_CLOSING) { |
| 866 | nl->connection = PLIP_CN_NONE; |
| 867 | netif_wake_queue (dev); |
| 868 | } |
| 869 | spin_unlock_irq(&nl->lock); |
| 870 | if (nl->should_relinquish) { |
| 871 | nl->should_relinquish = nl->port_owner = 0; |
| 872 | parport_release(nl->pardev); |
| 873 | } |
| 874 | return OK; |
| 875 | } |
| 876 | |
| 877 | /* PLIP_ERROR --- wait till other end settled */ |
| 878 | static int |
| 879 | plip_error(struct net_device *dev, struct net_local *nl, |
| 880 | struct plip_local *snd, struct plip_local *rcv) |
| 881 | { |
| 882 | unsigned char status; |
| 883 | |
| 884 | status = read_status(dev); |
| 885 | if ((status & 0xf8) == 0x80) { |
| 886 | if (net_debug > 2) |
| 887 | printk(KERN_DEBUG "%s: reset interface.\n", dev->name); |
| 888 | nl->connection = PLIP_CN_NONE; |
| 889 | nl->should_relinquish = 0; |
| 890 | netif_start_queue (dev); |
| 891 | enable_parport_interrupts (dev); |
| 892 | ENABLE(dev->irq); |
| 893 | netif_wake_queue (dev); |
| 894 | } else { |
| 895 | nl->is_deferred = 1; |
| 896 | schedule_delayed_work(&nl->deferred, 1); |
| 897 | } |
| 898 | |
| 899 | return OK; |
| 900 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | /* Handle the parallel port interrupts. */ |
| 903 | static void |
Jeff Garzik | 5712cb3 | 2007-10-19 02:54:26 -0400 | [diff] [blame] | 904 | plip_interrupt(void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | { |
| 906 | struct net_device *dev = dev_id; |
| 907 | struct net_local *nl; |
| 908 | struct plip_local *rcv; |
| 909 | unsigned char c0; |
Mikulas Patocka | cabce28 | 2008-04-01 01:22:45 +0200 | [diff] [blame] | 910 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | nl = netdev_priv(dev); |
| 913 | rcv = &nl->rcv_data; |
| 914 | |
Mikulas Patocka | cabce28 | 2008-04-01 01:22:45 +0200 | [diff] [blame] | 915 | spin_lock_irqsave (&nl->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
| 917 | c0 = read_status(dev); |
| 918 | if ((c0 & 0xf8) != 0xc0) { |
| 919 | if ((dev->irq != -1) && (net_debug > 1)) |
| 920 | printk(KERN_DEBUG "%s: spurious interrupt\n", dev->name); |
Mikulas Patocka | cabce28 | 2008-04-01 01:22:45 +0200 | [diff] [blame] | 921 | spin_unlock_irqrestore (&nl->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | return; |
| 923 | } |
| 924 | |
| 925 | if (net_debug > 3) |
| 926 | printk(KERN_DEBUG "%s: interrupt.\n", dev->name); |
| 927 | |
| 928 | switch (nl->connection) { |
| 929 | case PLIP_CN_CLOSING: |
| 930 | netif_wake_queue (dev); |
| 931 | case PLIP_CN_NONE: |
| 932 | case PLIP_CN_SEND: |
| 933 | rcv->state = PLIP_PK_TRIGGER; |
| 934 | nl->connection = PLIP_CN_RECEIVE; |
| 935 | nl->timeout_count = 0; |
| 936 | schedule_work(&nl->immediate); |
| 937 | break; |
| 938 | |
| 939 | case PLIP_CN_RECEIVE: |
| 940 | /* May occur because there is race condition |
| 941 | around test and set of dev->interrupt. |
| 942 | Ignore this interrupt. */ |
| 943 | break; |
| 944 | |
| 945 | case PLIP_CN_ERROR: |
| 946 | printk(KERN_ERR "%s: receive interrupt in error state\n", dev->name); |
| 947 | break; |
| 948 | } |
| 949 | |
Mikulas Patocka | cabce28 | 2008-04-01 01:22:45 +0200 | [diff] [blame] | 950 | spin_unlock_irqrestore(&nl->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | static int |
| 954 | plip_tx_packet(struct sk_buff *skb, struct net_device *dev) |
| 955 | { |
| 956 | struct net_local *nl = netdev_priv(dev); |
| 957 | struct plip_local *snd = &nl->snd_data; |
| 958 | |
| 959 | if (netif_queue_stopped(dev)) |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 960 | return NETDEV_TX_BUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
| 962 | /* We may need to grab the bus */ |
| 963 | if (!nl->port_owner) { |
| 964 | if (parport_claim(nl->pardev)) |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 965 | return NETDEV_TX_BUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | nl->port_owner = 1; |
| 967 | } |
| 968 | |
| 969 | netif_stop_queue (dev); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | if (skb->len > dev->mtu + dev->hard_header_len) { |
| 972 | printk(KERN_WARNING "%s: packet too big, %d.\n", dev->name, (int)skb->len); |
| 973 | netif_start_queue (dev); |
Patrick McHardy | 5b54814 | 2009-06-12 06:22:29 +0000 | [diff] [blame] | 974 | return NETDEV_TX_BUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | if (net_debug > 2) |
| 978 | printk(KERN_DEBUG "%s: send request\n", dev->name); |
| 979 | |
| 980 | spin_lock_irq(&nl->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | snd->skb = skb; |
| 982 | snd->length.h = skb->len; |
| 983 | snd->state = PLIP_PK_TRIGGER; |
| 984 | if (nl->connection == PLIP_CN_NONE) { |
| 985 | nl->connection = PLIP_CN_SEND; |
| 986 | nl->timeout_count = 0; |
| 987 | } |
| 988 | schedule_work(&nl->immediate); |
| 989 | spin_unlock_irq(&nl->lock); |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 990 | |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 991 | return NETDEV_TX_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | static void |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 995 | plip_rewrite_address(const struct net_device *dev, struct ethhdr *eth) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | { |
Eric Dumazet | 95ae6b2 | 2010-09-15 04:04:31 +0000 | [diff] [blame] | 997 | const struct in_device *in_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
Eric Dumazet | 95ae6b2 | 2010-09-15 04:04:31 +0000 | [diff] [blame] | 999 | rcu_read_lock(); |
| 1000 | in_dev = __in_dev_get_rcu(dev); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1001 | if (in_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | /* Any address will do - we take the first */ |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1003 | const struct in_ifaddr *ifa = in_dev->ifa_list; |
| 1004 | if (ifa) { |
Joe Perches | d458cdf | 2013-10-01 19:04:40 -0700 | [diff] [blame] | 1005 | memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | memset(eth->h_dest, 0xfc, 2); |
| 1007 | memcpy(eth->h_dest+2, &ifa->ifa_address, 4); |
| 1008 | } |
| 1009 | } |
Eric Dumazet | 95ae6b2 | 2010-09-15 04:04:31 +0000 | [diff] [blame] | 1010 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | static int |
| 1014 | plip_hard_header(struct sk_buff *skb, struct net_device *dev, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1015 | unsigned short type, const void *daddr, |
| 1016 | const void *saddr, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | int ret; |
| 1019 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1020 | ret = eth_header(skb, dev, type, daddr, saddr, len); |
| 1021 | if (ret >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | plip_rewrite_address (dev, (struct ethhdr *)skb->data); |
| 1023 | |
| 1024 | return ret; |
| 1025 | } |
| 1026 | |
Hannes Eder | dac499f | 2008-12-25 23:56:45 -0800 | [diff] [blame] | 1027 | static int plip_hard_header_cache(const struct neighbour *neigh, |
David S. Miller | e69dd33 | 2011-07-12 23:28:12 -0700 | [diff] [blame] | 1028 | struct hh_cache *hh, __be16 type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | int ret; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1031 | |
David S. Miller | e69dd33 | 2011-07-12 23:28:12 -0700 | [diff] [blame] | 1032 | ret = eth_header_cache(neigh, hh, type); |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1033 | if (ret == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | struct ethhdr *eth; |
| 1035 | |
| 1036 | eth = (struct ethhdr*)(((u8*)hh->hh_data) + |
| 1037 | HH_DATA_OFF(sizeof(*eth))); |
| 1038 | plip_rewrite_address (neigh->dev, eth); |
| 1039 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | return ret; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1042 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | |
| 1044 | /* Open/initialize the board. This is called (in the current kernel) |
| 1045 | sometime after booting when the 'ifconfig' program is run. |
| 1046 | |
| 1047 | This routine gets exclusive access to the parallel port by allocating |
| 1048 | its IRQ line. |
| 1049 | */ |
| 1050 | static int |
| 1051 | plip_open(struct net_device *dev) |
| 1052 | { |
| 1053 | struct net_local *nl = netdev_priv(dev); |
| 1054 | struct in_device *in_dev; |
| 1055 | |
| 1056 | /* Grab the port */ |
| 1057 | if (!nl->port_owner) { |
| 1058 | if (parport_claim(nl->pardev)) return -EAGAIN; |
| 1059 | nl->port_owner = 1; |
| 1060 | } |
| 1061 | |
| 1062 | nl->should_relinquish = 0; |
| 1063 | |
| 1064 | /* Clear the data port. */ |
| 1065 | write_data (dev, 0x00); |
| 1066 | |
| 1067 | /* Enable rx interrupt. */ |
| 1068 | enable_parport_interrupts (dev); |
| 1069 | if (dev->irq == -1) |
| 1070 | { |
| 1071 | atomic_set (&nl->kill_timer, 0); |
| 1072 | schedule_delayed_work(&nl->timer, 1); |
| 1073 | } |
| 1074 | |
| 1075 | /* Initialize the state machine. */ |
| 1076 | nl->rcv_data.state = nl->snd_data.state = PLIP_PK_DONE; |
| 1077 | nl->rcv_data.skb = nl->snd_data.skb = NULL; |
| 1078 | nl->connection = PLIP_CN_NONE; |
| 1079 | nl->is_deferred = 0; |
| 1080 | |
| 1081 | /* Fill in the MAC-level header. |
| 1082 | We used to abuse dev->broadcast to store the point-to-point |
| 1083 | MAC address, but we no longer do it. Instead, we fetch the |
| 1084 | interface address whenever it is needed, which is cheap enough |
| 1085 | because we use the hh_cache. Actually, abusing dev->broadcast |
| 1086 | didn't work, because when using plip_open the point-to-point |
| 1087 | address isn't yet known. |
| 1088 | PLIP doesn't have a real MAC address, but we need it to be |
| 1089 | DOS compatible, and to properly support taps (otherwise, |
| 1090 | when the device address isn't identical to the address of a |
| 1091 | received frame, the kernel incorrectly drops it). */ |
| 1092 | |
Eric Dumazet | 95ae6b2 | 2010-09-15 04:04:31 +0000 | [diff] [blame] | 1093 | in_dev=__in_dev_get_rtnl(dev); |
| 1094 | if (in_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | /* Any address will do - we take the first. We already |
| 1096 | have the first two bytes filled with 0xfc, from |
| 1097 | plip_init_dev(). */ |
| 1098 | struct in_ifaddr *ifa=in_dev->ifa_list; |
| 1099 | if (ifa != NULL) { |
| 1100 | memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | netif_start_queue (dev); |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | /* The inverse routine to plip_open (). */ |
| 1110 | static int |
| 1111 | plip_close(struct net_device *dev) |
| 1112 | { |
| 1113 | struct net_local *nl = netdev_priv(dev); |
| 1114 | struct plip_local *snd = &nl->snd_data; |
| 1115 | struct plip_local *rcv = &nl->rcv_data; |
| 1116 | |
| 1117 | netif_stop_queue (dev); |
| 1118 | DISABLE(dev->irq); |
| 1119 | synchronize_irq(dev->irq); |
| 1120 | |
| 1121 | if (dev->irq == -1) |
| 1122 | { |
Matthias Kaehlcke | 01f31ac | 2007-12-13 16:03:00 -0800 | [diff] [blame] | 1123 | init_completion(&nl->killed_timer_cmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | atomic_set (&nl->kill_timer, 1); |
Matthias Kaehlcke | 01f31ac | 2007-12-13 16:03:00 -0800 | [diff] [blame] | 1125 | wait_for_completion(&nl->killed_timer_cmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | } |
| 1127 | |
| 1128 | #ifdef NOTDEF |
| 1129 | outb(0x00, PAR_DATA(dev)); |
| 1130 | #endif |
| 1131 | nl->is_deferred = 0; |
| 1132 | nl->connection = PLIP_CN_NONE; |
| 1133 | if (nl->port_owner) { |
| 1134 | parport_release(nl->pardev); |
| 1135 | nl->port_owner = 0; |
| 1136 | } |
| 1137 | |
| 1138 | snd->state = PLIP_PK_DONE; |
| 1139 | if (snd->skb) { |
| 1140 | dev_kfree_skb(snd->skb); |
| 1141 | snd->skb = NULL; |
| 1142 | } |
| 1143 | rcv->state = PLIP_PK_DONE; |
| 1144 | if (rcv->skb) { |
| 1145 | kfree_skb(rcv->skb); |
| 1146 | rcv->skb = NULL; |
| 1147 | } |
| 1148 | |
| 1149 | #ifdef NOTDEF |
| 1150 | /* Reset. */ |
| 1151 | outb(0x00, PAR_CONTROL(dev)); |
| 1152 | #endif |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
| 1156 | static int |
| 1157 | plip_preempt(void *handle) |
| 1158 | { |
| 1159 | struct net_device *dev = (struct net_device *)handle; |
| 1160 | struct net_local *nl = netdev_priv(dev); |
| 1161 | |
| 1162 | /* Stand our ground if a datagram is on the wire */ |
| 1163 | if (nl->connection != PLIP_CN_NONE) { |
| 1164 | nl->should_relinquish = 1; |
| 1165 | return 1; |
| 1166 | } |
| 1167 | |
| 1168 | nl->port_owner = 0; /* Remember that we released the bus */ |
| 1169 | return 0; |
| 1170 | } |
| 1171 | |
| 1172 | static void |
| 1173 | plip_wakeup(void *handle) |
| 1174 | { |
| 1175 | struct net_device *dev = (struct net_device *)handle; |
| 1176 | struct net_local *nl = netdev_priv(dev); |
| 1177 | |
| 1178 | if (nl->port_owner) { |
| 1179 | /* Why are we being woken up? */ |
| 1180 | printk(KERN_DEBUG "%s: why am I being woken up?\n", dev->name); |
| 1181 | if (!parport_claim(nl->pardev)) |
| 1182 | /* bus_owner is already set (but why?) */ |
| 1183 | printk(KERN_DEBUG "%s: I'm broken.\n", dev->name); |
| 1184 | else |
| 1185 | return; |
| 1186 | } |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (!(dev->flags & IFF_UP)) |
| 1189 | /* Don't need the port when the interface is down */ |
| 1190 | return; |
| 1191 | |
| 1192 | if (!parport_claim(nl->pardev)) { |
| 1193 | nl->port_owner = 1; |
| 1194 | /* Clear the data port. */ |
| 1195 | write_data (dev, 0x00); |
| 1196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | static int |
| 1200 | plip_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) |
| 1201 | { |
| 1202 | struct net_local *nl = netdev_priv(dev); |
| 1203 | struct plipconf *pc = (struct plipconf *) &rq->ifr_ifru; |
| 1204 | |
| 1205 | if (cmd != SIOCDEVPLIP) |
| 1206 | return -EOPNOTSUPP; |
| 1207 | |
| 1208 | switch(pc->pcmd) { |
| 1209 | case PLIP_GET_TIMEOUT: |
| 1210 | pc->trigger = nl->trigger; |
| 1211 | pc->nibble = nl->nibble; |
| 1212 | break; |
| 1213 | case PLIP_SET_TIMEOUT: |
| 1214 | if(!capable(CAP_NET_ADMIN)) |
| 1215 | return -EPERM; |
| 1216 | nl->trigger = pc->trigger; |
| 1217 | nl->nibble = pc->nibble; |
| 1218 | break; |
| 1219 | default: |
| 1220 | return -EOPNOTSUPP; |
| 1221 | } |
| 1222 | return 0; |
| 1223 | } |
Jesper Juhl | 77933d7 | 2005-07-27 11:46:09 -0700 | [diff] [blame] | 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | static int parport[PLIP_MAX] = { [0 ... PLIP_MAX-1] = -1 }; |
| 1226 | static int timid; |
| 1227 | |
| 1228 | module_param_array(parport, int, NULL, 0); |
| 1229 | module_param(timid, int, 0); |
| 1230 | MODULE_PARM_DESC(parport, "List of parport device numbers to use by plip"); |
| 1231 | |
| 1232 | static struct net_device *dev_plip[PLIP_MAX] = { NULL, }; |
| 1233 | |
| 1234 | static inline int |
| 1235 | plip_searchfor(int list[], int a) |
| 1236 | { |
| 1237 | int i; |
| 1238 | for (i = 0; i < PLIP_MAX && list[i] != -1; i++) { |
| 1239 | if (list[i] == a) return 1; |
| 1240 | } |
| 1241 | return 0; |
| 1242 | } |
| 1243 | |
| 1244 | /* plip_attach() is called (by the parport code) when a port is |
| 1245 | * available to use. */ |
| 1246 | static void plip_attach (struct parport *port) |
| 1247 | { |
| 1248 | static int unit; |
| 1249 | struct net_device *dev; |
| 1250 | struct net_local *nl; |
| 1251 | char name[IFNAMSIZ]; |
Sudip Mukherjee | 824b1a9 | 2016-01-07 15:42:37 +0530 | [diff] [blame] | 1252 | struct pardev_cb plip_cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1254 | if ((parport[0] == -1 && (!timid || !port->devices)) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | plip_searchfor(parport, port->number)) { |
| 1256 | if (unit == PLIP_MAX) { |
| 1257 | printk(KERN_ERR "plip: too many devices\n"); |
| 1258 | return; |
| 1259 | } |
| 1260 | |
| 1261 | sprintf(name, "plip%d", unit); |
| 1262 | dev = alloc_etherdev(sizeof(struct net_local)); |
Joe Perches | 41de8d4 | 2012-01-29 13:47:52 +0000 | [diff] [blame] | 1263 | if (!dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | return; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | strcpy(dev->name, name); |
| 1267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | dev->irq = port->irq; |
| 1269 | dev->base_addr = port->base; |
| 1270 | if (port->irq == -1) { |
| 1271 | printk(KERN_INFO "plip: %s has no IRQ. Using IRQ-less mode," |
| 1272 | "which is fairly inefficient!\n", port->name); |
| 1273 | } |
| 1274 | |
| 1275 | nl = netdev_priv(dev); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1276 | nl->dev = dev; |
Sudip Mukherjee | 824b1a9 | 2016-01-07 15:42:37 +0530 | [diff] [blame] | 1277 | |
| 1278 | memset(&plip_cb, 0, sizeof(plip_cb)); |
| 1279 | plip_cb.private = dev; |
| 1280 | plip_cb.preempt = plip_preempt; |
| 1281 | plip_cb.wakeup = plip_wakeup; |
| 1282 | plip_cb.irq_func = plip_interrupt; |
| 1283 | |
| 1284 | nl->pardev = parport_register_dev_model(port, dev->name, |
| 1285 | &plip_cb, unit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
| 1287 | if (!nl->pardev) { |
| 1288 | printk(KERN_ERR "%s: parport_register failed\n", name); |
| 1289 | goto err_free_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | } |
| 1291 | |
| 1292 | plip_init_netdev(dev); |
| 1293 | |
| 1294 | if (register_netdev(dev)) { |
| 1295 | printk(KERN_ERR "%s: network register failed\n", name); |
| 1296 | goto err_parport_unregister; |
| 1297 | } |
| 1298 | |
| 1299 | printk(KERN_INFO "%s", version); |
| 1300 | if (dev->irq != -1) |
| 1301 | printk(KERN_INFO "%s: Parallel port at %#3lx, " |
| 1302 | "using IRQ %d.\n", |
| 1303 | dev->name, dev->base_addr, dev->irq); |
| 1304 | else |
| 1305 | printk(KERN_INFO "%s: Parallel port at %#3lx, " |
| 1306 | "not using IRQ.\n", |
| 1307 | dev->name, dev->base_addr); |
| 1308 | dev_plip[unit++] = dev; |
| 1309 | } |
| 1310 | return; |
| 1311 | |
| 1312 | err_parport_unregister: |
| 1313 | parport_unregister_device(nl->pardev); |
| 1314 | err_free_dev: |
| 1315 | free_netdev(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | } |
| 1317 | |
| 1318 | /* plip_detach() is called (by the parport code) when a port is |
| 1319 | * no longer available to use. */ |
| 1320 | static void plip_detach (struct parport *port) |
| 1321 | { |
| 1322 | /* Nothing to do */ |
| 1323 | } |
| 1324 | |
Sudip Mukherjee | 824b1a9 | 2016-01-07 15:42:37 +0530 | [diff] [blame] | 1325 | static int plip_probe(struct pardevice *par_dev) |
| 1326 | { |
| 1327 | struct device_driver *drv = par_dev->dev.driver; |
| 1328 | int len = strlen(drv->name); |
| 1329 | |
| 1330 | if (strncmp(par_dev->name, drv->name, len)) |
| 1331 | return -ENODEV; |
| 1332 | |
| 1333 | return 0; |
| 1334 | } |
| 1335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | static struct parport_driver plip_driver = { |
Sudip Mukherjee | 824b1a9 | 2016-01-07 15:42:37 +0530 | [diff] [blame] | 1337 | .name = "plip", |
| 1338 | .probe = plip_probe, |
| 1339 | .match_port = plip_attach, |
| 1340 | .detach = plip_detach, |
| 1341 | .devmodel = true, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | }; |
| 1343 | |
| 1344 | static void __exit plip_cleanup_module (void) |
| 1345 | { |
| 1346 | struct net_device *dev; |
| 1347 | int i; |
| 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | for (i=0; i < PLIP_MAX; i++) { |
| 1350 | if ((dev = dev_plip[i])) { |
| 1351 | struct net_local *nl = netdev_priv(dev); |
| 1352 | unregister_netdev(dev); |
| 1353 | if (nl->port_owner) |
| 1354 | parport_release(nl->pardev); |
| 1355 | parport_unregister_device(nl->pardev); |
| 1356 | free_netdev(dev); |
| 1357 | dev_plip[i] = NULL; |
| 1358 | } |
| 1359 | } |
Sudip Mukherjee | 824b1a9 | 2016-01-07 15:42:37 +0530 | [diff] [blame] | 1360 | |
| 1361 | parport_unregister_driver(&plip_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | |
| 1364 | #ifndef MODULE |
| 1365 | |
| 1366 | static int parport_ptr; |
| 1367 | |
| 1368 | static int __init plip_setup(char *str) |
| 1369 | { |
| 1370 | int ints[4]; |
| 1371 | |
| 1372 | str = get_options(str, ARRAY_SIZE(ints), ints); |
| 1373 | |
| 1374 | /* Ugh. */ |
| 1375 | if (!strncmp(str, "parport", 7)) { |
| 1376 | int n = simple_strtoul(str+7, NULL, 10); |
| 1377 | if (parport_ptr < PLIP_MAX) |
| 1378 | parport[parport_ptr++] = n; |
| 1379 | else |
| 1380 | printk(KERN_INFO "plip: too many ports, %s ignored.\n", |
| 1381 | str); |
| 1382 | } else if (!strcmp(str, "timid")) { |
| 1383 | timid = 1; |
| 1384 | } else { |
| 1385 | if (ints[0] == 0 || ints[1] == 0) { |
| 1386 | /* disable driver on "plip=" or "plip=0" */ |
| 1387 | parport[0] = -2; |
| 1388 | } else { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1389 | printk(KERN_WARNING "warning: 'plip=0x%x' ignored\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | ints[1]); |
| 1391 | } |
| 1392 | } |
| 1393 | return 1; |
| 1394 | } |
| 1395 | |
| 1396 | __setup("plip=", plip_setup); |
| 1397 | |
| 1398 | #endif /* !MODULE */ |
| 1399 | |
| 1400 | static int __init plip_init (void) |
| 1401 | { |
| 1402 | if (parport[0] == -2) |
| 1403 | return 0; |
| 1404 | |
| 1405 | if (parport[0] != -1 && timid) { |
| 1406 | printk(KERN_WARNING "plip: warning, ignoring `timid' since specific ports given.\n"); |
| 1407 | timid = 0; |
| 1408 | } |
| 1409 | |
| 1410 | if (parport_register_driver (&plip_driver)) { |
| 1411 | printk (KERN_WARNING "plip: couldn't register driver\n"); |
| 1412 | return 1; |
| 1413 | } |
| 1414 | |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
| 1418 | module_init(plip_init); |
| 1419 | module_exit(plip_cleanup_module); |
| 1420 | MODULE_LICENSE("GPL"); |