1/* 2 * Sealevel Systems 4021 driver. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * (c) Copyright 1999, 2001 Alan Cox 10 * (c) Copyright 2001 Red Hat Inc. 11 * 12 */ 13 14#include <linux/module.h> 15#include <linux/kernel.h> 16#include <linux/mm.h> 17#include <linux/net.h> 18#include <linux/skbuff.h> 19#include <linux/netdevice.h> 20#include <linux/if_arp.h> 21#include <linux/delay.h> 22#include <linux/ioport.h> 23#include <linux/init.h> 24#include <net/arp.h> 25 26#include <asm/irq.h> 27#include <asm/io.h> 28#include <asm/dma.h> 29#include <asm/byteorder.h> 30#include <net/syncppp.h> 31#include "z85230.h" 32 33 34struct slvl_device 35{ 36 void *if_ptr; /* General purpose pointer (used by SPPP) */ 37 struct z8530_channel *chan; 38 struct ppp_device pppdev; 39 int channel; 40}; 41 42 43struct slvl_board 44{ 45 struct slvl_device *dev[2]; 46 struct z8530_dev board; 47 int iobase; 48}; 49 50/* 51 * Network driver support routines 52 */ 53 54/* 55 * Frame receive. Simple for our card as we do sync ppp and there 56 * is no funny garbage involved 57 */ 58 59static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb) 60{ 61 /* Drop the CRC - it's not a good idea to try and negotiate it ;) */ 62 skb_trim(skb, skb->len-2); 63 skb->protocol=htons(ETH_P_WAN_PPP); 64 skb_reset_mac_header(skb); 65 skb->dev=c->netdevice; 66 /* 67 * Send it to the PPP layer. We don't have time to process 68 * it right now. 69 */ 70 netif_rx(skb); 71 c->netdevice->last_rx = jiffies; 72} 73 74/* 75 * We've been placed in the UP state 76 */ 77 78static int sealevel_open(struct net_device *d) 79{ 80 struct slvl_device *slvl=d->priv; 81 int err = -1; 82 int unit = slvl->channel; 83 84 /* 85 * Link layer up. 86 */ 87 88 switch(unit) 89 { 90 case 0: 91 err=z8530_sync_dma_open(d, slvl->chan); 92 break; 93 case 1: 94 err=z8530_sync_open(d, slvl->chan); 95 break; 96 } 97 98 if(err) 99 return err; 100 /* 101 * Begin PPP 102 */ 103 err=sppp_open(d); 104 if(err) 105 { 106 switch(unit) 107 { 108 case 0: 109 z8530_sync_dma_close(d, slvl->chan); 110 break; 111 case 1: 112 z8530_sync_close(d, slvl->chan); 113 break; 114 } 115 return err; 116 } 117 118 slvl->chan->rx_function=sealevel_input; 119 120 /* 121 * Go go go 122 */ 123 netif_start_queue(d); 124 return 0; 125} 126 127static int sealevel_close(struct net_device *d) 128{ 129 struct slvl_device *slvl=d->priv; 130 int unit = slvl->channel; 131 132 /* 133 * Discard new frames 134 */ 135 136 slvl->chan->rx_function=z8530_null_rx; 137 138 /* 139 * PPP off 140 */ 141 sppp_close(d); 142 /* 143 * Link layer down 144 */ 145 146 netif_stop_queue(d); 147 148 switch(unit) 149 { 150 case 0: 151 z8530_sync_dma_close(d, slvl->chan); 152 break; 153 case 1: 154 z8530_sync_close(d, slvl->chan); 155 break; 156 } 157 return 0; 158} 159 160static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd) 161{ 162 /* struct slvl_device *slvl=d->priv; 163 z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */ 164 return sppp_do_ioctl(d, ifr,cmd); 165} 166 167static struct net_device_stats *sealevel_get_stats(struct net_device *d) 168{ 169 struct slvl_device *slvl=d->priv; 170 if(slvl) 171 return z8530_get_stats(slvl->chan); 172 else 173 return NULL; 174} 175 176/* 177 * Passed PPP frames, fire them downwind. 178 */ 179 180static int sealevel_queue_xmit(struct sk_buff *skb, struct net_device *d) 181{ 182 struct slvl_device *slvl=d->priv; 183 return z8530_queue_xmit(slvl->chan, skb); 184} 185 186static int sealevel_neigh_setup(struct neighbour *n) 187{ 188 if (n->nud_state == NUD_NONE) { 189 n->ops = &arp_broken_ops; 190 n->output = n->ops->output; 191 } 192 return 0; 193} 194 195static int sealevel_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) 196{ 197 if (p->tbl->family == AF_INET) { 198 p->neigh_setup = sealevel_neigh_setup; 199 p->ucast_probes = 0; 200 p->mcast_probes = 0; 201 } 202 return 0; 203} 204 205static int sealevel_attach(struct net_device *dev) 206{ 207 struct slvl_device *sv = dev->priv; 208 sppp_attach(&sv->pppdev); 209 return 0; 210} 211 212static void sealevel_detach(struct net_device *dev) 213{ 214 sppp_detach(dev); 215} 216 217static void slvl_setup(struct net_device *d) 218{ 219 d->open = sealevel_open; 220 d->stop = sealevel_close; 221 d->init = sealevel_attach; 222 d->uninit = sealevel_detach; 223 d->hard_start_xmit = sealevel_queue_xmit; 224 d->get_stats = sealevel_get_stats; 225 d->set_multicast_list = NULL; 226 d->do_ioctl = sealevel_ioctl; 227 d->neigh_setup = sealevel_neigh_setup_dev; 228 d->set_mac_address = NULL; 229 230} 231 232static inline struct slvl_device *slvl_alloc(int iobase, int irq) 233{ 234 struct net_device *d; 235 struct slvl_device *sv; 236 237 d = alloc_netdev(sizeof(struct slvl_device), "hdlc%d", 238 slvl_setup); 239 240 if (!d) 241 return NULL; 242 243 sv = d->priv; 244 sv->if_ptr = &sv->pppdev; 245 sv->pppdev.dev = d; 246 d->base_addr = iobase; 247 d->irq = irq; 248 249 return sv; 250} 251 252 253/* 254 * Allocate and setup Sealevel board. 255 */ 256 257static __init struct slvl_board *slvl_init(int iobase, int irq, 258 int txdma, int rxdma, int slow) 259{ 260 struct z8530_dev *dev; 261 struct slvl_board *b; 262 263 /* 264 * Get the needed I/O space 265 */ 266 267 if(!request_region(iobase, 8, "Sealevel 4021")) 268 { 269 printk(KERN_WARNING "sealevel: I/O 0x%X already in use.\n", iobase); 270 return NULL; 271 } 272 273 b = kmalloc(sizeof(struct slvl_board), GFP_KERNEL); 274 if(!b) 275 goto fail3; 276 277 memset(b, 0, sizeof(*b)); 278 if (!(b->dev[0]= slvl_alloc(iobase, irq))) 279 goto fail2; 280 281 b->dev[0]->chan = &b->board.chanA; 282 b->dev[0]->channel = 0; 283 284 if (!(b->dev[1] = slvl_alloc(iobase, irq))) 285 goto fail1_0; 286 287 b->dev[1]->chan = &b->board.chanB; 288 b->dev[1]->channel = 1; 289 290 dev = &b->board; 291 292 /* 293 * Stuff in the I/O addressing 294 */ 295 296 dev->active = 0; 297 298 b->iobase = iobase; 299 300 /* 301 * Select 8530 delays for the old board 302 */ 303 304 if(slow) 305 iobase |= Z8530_PORT_SLEEP; 306 307 dev->chanA.ctrlio=iobase+1; 308 dev->chanA.dataio=iobase; 309 dev->chanB.ctrlio=iobase+3; 310 dev->chanB.dataio=iobase+2; 311 312 dev->chanA.irqs=&z8530_nop; 313 dev->chanB.irqs=&z8530_nop; 314 315 /* 316 * Assert DTR enable DMA 317 */ 318 319 outb(3|(1<<7), b->iobase+4); 320 321 322 /* We want a fast IRQ for this device. Actually we'd like an even faster 323 IRQ ;) - This is one driver RtLinux is made for */ 324 325 if(request_irq(irq, &z8530_interrupt, IRQF_DISABLED, "SeaLevel", dev)<0) 326 { 327 printk(KERN_WARNING "sealevel: IRQ %d already in use.\n", irq); 328 goto fail1_1; 329 } 330 331 dev->irq=irq; 332 dev->chanA.private=&b->dev[0]; 333 dev->chanB.private=&b->dev[1]; 334 dev->chanA.netdevice=b->dev[0]->pppdev.dev; 335 dev->chanB.netdevice=b->dev[1]->pppdev.dev; 336 dev->chanA.dev=dev; 337 dev->chanB.dev=dev; 338 339 dev->chanA.txdma=3; 340 dev->chanA.rxdma=1; 341 if(request_dma(dev->chanA.txdma, "SeaLevel (TX)")!=0) 342 goto fail; 343 344 if(request_dma(dev->chanA.rxdma, "SeaLevel (RX)")!=0) 345 goto dmafail; 346 347 disable_irq(irq); 348 349 /* 350 * Begin normal initialise 351 */ 352 353 if(z8530_init(dev)!=0) 354 { 355 printk(KERN_ERR "Z8530 series device not found.\n"); 356 enable_irq(irq); 357 goto dmafail2; 358 } 359 if(dev->type==Z85C30) 360 { 361 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream); 362 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream); 363 } 364 else 365 { 366 z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230); 367 z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230); 368 } 369 370 /* 371 * Now we can take the IRQ 372 */ 373 374 enable_irq(irq); 375 376 if (register_netdev(b->dev[0]->pppdev.dev)) 377 goto dmafail2; 378 379 if (register_netdev(b->dev[1]->pppdev.dev)) 380 goto fail_unit; 381 382 z8530_describe(dev, "I/O", iobase); 383 dev->active=1; 384 return b; 385 386fail_unit: 387 unregister_netdev(b->dev[0]->pppdev.dev); 388 389dmafail2: 390 free_dma(dev->chanA.rxdma); 391dmafail: 392 free_dma(dev->chanA.txdma); 393fail: 394 free_irq(irq, dev); 395fail1_1: 396 free_netdev(b->dev[1]->pppdev.dev); 397fail1_0: 398 free_netdev(b->dev[0]->pppdev.dev); 399fail2: 400 kfree(b); 401fail3: 402 release_region(iobase,8); 403 return NULL; 404} 405 406static void __exit slvl_shutdown(struct slvl_board *b) 407{ 408 int u; 409 410 z8530_shutdown(&b->board); 411 412 for(u=0; u<2; u++) 413 { 414 struct net_device *d = b->dev[u]->pppdev.dev; 415 unregister_netdev(d); 416 free_netdev(d); 417 } 418 419 free_irq(b->board.irq, &b->board); 420 free_dma(b->board.chanA.rxdma); 421 free_dma(b->board.chanA.txdma); 422 /* DMA off on the card, drop DTR */ 423 outb(0, b->iobase); 424 release_region(b->iobase, 8); 425 kfree(b); 426} 427 428 429static int io=0x238; 430static int txdma=1; 431static int rxdma=3; 432static int irq=5; 433static int slow=0; 434 435module_param(io, int, 0); 436MODULE_PARM_DESC(io, "The I/O base of the Sealevel card"); 437module_param(txdma, int, 0); 438MODULE_PARM_DESC(txdma, "Transmit DMA channel"); 439module_param(rxdma, int, 0); 440MODULE_PARM_DESC(rxdma, "Receive DMA channel"); 441module_param(irq, int, 0); 442MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card"); 443module_param(slow, bool, 0); 444MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012"); 445 446MODULE_AUTHOR("Alan Cox"); 447MODULE_LICENSE("GPL"); 448MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021"); 449 450static struct slvl_board *slvl_unit; 451 452static int __init slvl_init_module(void) 453{ 454#ifdef MODULE 455 printk(KERN_INFO "SeaLevel Z85230 Synchronous Driver v 0.02.\n"); 456 printk(KERN_INFO "(c) Copyright 1998, Building Number Three Ltd.\n"); 457#endif 458 slvl_unit = slvl_init(io, irq, txdma, rxdma, slow); 459 460 return slvl_unit ? 0 : -ENODEV; 461} 462 463static void __exit slvl_cleanup_module(void) 464{ 465 if(slvl_unit) 466 slvl_shutdown(slvl_unit); 467} 468 469module_init(slvl_init_module); 470module_exit(slvl_cleanup_module); 471