1/* $Id: e100lpslavenet.c,v 1.1.1.1 2008/10/15 03:26:01 james26_jang Exp $ 2 * 3 * e100lpslavenet.c: A network driver for the ETRAX 100LX slave controller. 4 * 5 * Copyright (c) 1998-2001 Axis Communications AB. 6 * 7 * The outline of this driver comes from skeleton.c. 8 * 9 * $Log: e100lpslavenet.c,v $ 10 * Revision 1.1.1.1 2008/10/15 03:26:01 james26_jang 11 * Initial. 12 * 13 * Revision 1.1.1.1 2008/07/21 09:14:22 james26_jang 14 * New UI, New QoS, New wireless driver(4.151.10.29), ipmonitor. 15 * 16 * Revision 1.1.1.1 2008/07/02 14:38:30 james26_jang 17 * 4.100.10.29, New QoS and New UI. 18 * 19 * Revision 1.1.1.1 2007/02/15 12:10:52 jiahao 20 * initial update 21 * 22 * Revision 1.1.1.1 2007/01/25 12:51:48 jiahao_jhou 23 * 24 * 25 * Revision 1.1.1.1 2003/02/03 22:37:20 mhuang 26 * LINUX_2_4 branch snapshot from linux-mips.org CVS 27 * 28 * Revision 1.5 2002/04/22 11:47:24 johana 29 * Fix according to 2.4.19-pre7. time_after/time_before and 30 * missing end of comment. 31 * The patch has a typo for ethernet.c in e100_clear_network_leds(), 32 * that is fixed here. 33 * 34 * Revision 1.4 2001/06/21 16:55:26 olof 35 * Minimized par port setup time to gain bandwidth 36 * 37 * Revision 1.3 2001/06/21 15:49:02 olof 38 * Removed setting of default MAC address 39 * 40 * Revision 1.2 2001/06/11 15:39:52 olof 41 * Clean up and sync with ethernet.c rev 1.16. Increased reset time of slave. 42 * 43 * Revision 1.1 2001/06/06 08:56:26 olof 44 * Added support for slave Etrax defined by CONFIG_ETRAX_ETHERNET_LPSLAVE 45 * 46 */ 47 48#include <linux/config.h> 49 50#include <linux/module.h> 51 52#include <linux/kernel.h> 53#include <linux/sched.h> 54#include <linux/delay.h> 55#include <linux/types.h> 56#include <linux/fcntl.h> 57#include <linux/interrupt.h> 58#include <linux/ptrace.h> 59#include <linux/ioport.h> 60#include <linux/in.h> 61#include <linux/slab.h> 62#include <linux/string.h> 63#include <linux/spinlock.h> 64#include <linux/errno.h> 65#include <linux/init.h> 66 67#include <linux/netdevice.h> 68#include <linux/etherdevice.h> 69#include <linux/skbuff.h> 70 71#include <asm/svinto.h> /* DMA and register descriptions */ 72#include <asm/io.h> /* LED_* I/O functions */ 73#include <asm/irq.h> 74#include <asm/dma.h> 75#include <asm/system.h> 76#include <asm/bitops.h> 77 78#include "e100lpslave.h" 79 80/* #define ETHDEBUG */ 81#define D(x) 82 83/* 84 * The name of the card. Is used for messages and in the requests for 85 * io regions, irqs and dma channels 86 */ 87 88static const char* cardname = "Etrax 100LX ethernet slave controller"; 89 90/* A default ethernet address. Highlevel SW will set the real one later */ 91 92static struct sockaddr default_mac = { 93 0, 94 { 0x00, 0x40, 0x8C, 0xCD, 0x00, 0x00 } 95}; 96 97/* Information that need to be kept for each board. */ 98struct net_local { 99 struct net_device_stats stats; 100 101 /* Tx control lock. This protects the transmit buffer ring 102 * state along with the "tx full" state of the driver. This 103 * means all netif_queue flow control actions are protected 104 * by this lock as well. 105 */ 106 spinlock_t lock; 107}; 108 109/* Dma descriptors etc. */ 110 111#define RX_BUF_SIZE 32768 112#define ETHER_HEAD_LEN 14 113 114#define PAR0_ECP_IRQ_NBR 4 115 116#define RX_DESC_BUF_SIZE 256 117#define NBR_OF_RX_DESC (RX_BUF_SIZE / \ 118 RX_DESC_BUF_SIZE) 119 120/* Size of slave etrax boot image */ 121#define ETRAX_PAR_BOOT_LENGTH 784 122 123static etrax_dma_descr *myNextRxDesc; /* Points to the next descriptor to 124 to be processed */ 125static etrax_dma_descr *myLastRxDesc; /* The last processed descriptor */ 126static etrax_dma_descr *myPrevRxDesc; /* The descriptor right before myNextRxDesc */ 127 128static unsigned char RxBuf[RX_BUF_SIZE]; 129 130static etrax_dma_descr RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned(4))); 131static etrax_dma_descr TxDescList[3] __attribute__ ((aligned(4))); 132 /* host command, data, bogus ECP command */ 133 134static struct sk_buff *tx_skb; 135 136/* Index to functions, as function prototypes. */ 137 138static int etrax_ethernet_lpslave_init(struct net_device *dev); 139 140static int e100_open(struct net_device *dev); 141static int e100_set_mac_address(struct net_device *dev, void *addr); 142static int e100_send_packet(struct sk_buff *skb, struct net_device *dev); 143static void e100rx_interrupt(int irq, void *dev_id, struct pt_regs *regs); 144static void e100tx_interrupt(int irq, void *dev_id, struct pt_regs *regs); 145static void ecp_interrupt(int irq, void *dev_id, struct pt_regs *regs); 146static void e100_rx(struct net_device *dev); 147static int e100_close(struct net_device *dev); 148static struct net_device_stats *e100_get_stats(struct net_device *dev); 149static void set_multicast_list(struct net_device *dev); 150static void e100_hardware_send_packet(unsigned long hostcmd, char *buf, int length); 151static void update_rx_stats(struct net_device_stats *); 152static void update_tx_stats(struct net_device_stats *); 153static void e100_reset_tranceiver(void); 154 155static void boot_slave(unsigned char *code); 156 157#ifdef ETHDEBUG 158static void dump_parport_status(void); 159#endif 160 161#define tx_done(dev) (*R_DMA_CH0_CMD == 0) 162 163static unsigned long host_command; 164extern unsigned char e100lpslaveprog; 165 166/* 167 * This driver uses PAR0 to recevice data from slave ETRAX and PAR1 to boot 168 * and send data to slave ETRAX. 169 * Used ETRAX100 DMAchannels with corresponding IRQ: 170 * PAR0 RX : DMA3 - IRQ 19 171 * PAR1 TX : DMA4 - IRQ 20 172 * IRQ 4 is used to detect ECP commands from slave ETRAX 173 * 174 * NOTE! PAR0 and PAR1 shares DMA and IRQ numbers with SER2 and SER3 175 */ 176 177 178/* 179 * Check for a network adaptor of this type, and return '0' if one exists. 180 * If dev->base_addr == 0, probe all likely locations. 181 * If dev->base_addr == 1, always return failure. 182 * If dev->base_addr == 2, allocate space for the device and return success 183 * (detachable devices only). 184 */ 185static int __init 186etrax_ethernet_lpslave_init(struct net_device *dev) 187{ 188 int i; 189 int anOffset = 0; 190 191 printk("Etrax/100 lpslave ethernet driver v0.3, (c) 1999 Axis Communications AB\n"); 192 193 dev->base_addr = 2; 194 195 printk("%s initialized\n", dev->name); 196 197 /* make Linux aware of the new hardware */ 198 199 if (!dev) { 200 printk(KERN_WARNING "%s: dev == NULL. Should this happen?\n", 201 cardname); 202 dev = init_etherdev(dev, sizeof(struct net_local)); 203 if (!dev) 204 panic("init_etherdev failed\n"); 205 } 206 207 /* setup generic handlers and stuff in the dev struct */ 208 209 ether_setup(dev); 210 211 /* make room for the local structure containing stats etc */ 212 213 dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL); 214 if (dev->priv == NULL) 215 return -ENOMEM; 216 memset(dev->priv, 0, sizeof(struct net_local)); 217 218 /* now setup our etrax specific stuff */ 219 220 dev->irq = DMA3_RX_IRQ_NBR; /* we really use DMATX as well... */ 221 dev->dma = PAR0_RX_DMA_NBR; 222 223 /* fill in our handlers so the network layer can talk to us in the future */ 224 225 dev->open = e100_open; 226 dev->hard_start_xmit = e100_send_packet; 227 dev->stop = e100_close; 228 dev->get_stats = e100_get_stats; 229 dev->set_multicast_list = set_multicast_list; 230 dev->set_mac_address = e100_set_mac_address; 231 232 /* Initialise the list of Etrax DMA-descriptors */ 233 234 /* Initialise receive descriptors */ 235 236 for(i = 0; i < (NBR_OF_RX_DESC - 1); i++) { 237 RxDescList[i].ctrl = 0; 238 RxDescList[i].sw_len = RX_DESC_BUF_SIZE; 239 RxDescList[i].next = virt_to_phys(&RxDescList[i + 1]); 240 RxDescList[i].buf = virt_to_phys(RxBuf + anOffset); 241 RxDescList[i].status = 0; 242 RxDescList[i].hw_len = 0; 243 anOffset += RX_DESC_BUF_SIZE; 244 } 245 246 RxDescList[i].ctrl = d_eol; 247 RxDescList[i].sw_len = RX_DESC_BUF_SIZE; 248 RxDescList[i].next = virt_to_phys(&RxDescList[0]); 249 RxDescList[i].buf = virt_to_phys(RxBuf + anOffset); 250 RxDescList[i].status = 0; 251 RxDescList[i].hw_len = 0; 252 253 /* Initialise initial pointers */ 254 255 myNextRxDesc = &RxDescList[0]; 256 myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1]; 257 myPrevRxDesc = &RxDescList[NBR_OF_RX_DESC - 1]; 258 259 /* setup some TX descriptor data */ 260 261 TxDescList[0].sw_len = 4; 262 TxDescList[0].ctrl = 0; 263 TxDescList[0].buf = virt_to_phys(&host_command); 264 TxDescList[0].next = virt_to_phys(&TxDescList[1]); 265 266 return 0; 267} 268 269/* set MAC address of the interface. called from the core after a 270 * SIOCSIFADDR ioctl, and from the bootup above. 271 */ 272 273static int 274e100_set_mac_address(struct net_device *dev, void *p) 275{ 276 struct sockaddr *addr = p; 277 int i; 278 279 /* remember it */ 280 281 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); 282 283 /* Write it to the hardware. 284 * Note the way the address is wrapped: 285 * *R_NETWORK_SA_0 = a0_0 | (a0_1 << 8) | (a0_2 << 16) | (a0_3 << 24); 286 * *R_NETWORK_SA_1 = a0_4 | (a0_5 << 8); 287 */ 288 289 tx_skb = 0; 290 e100_hardware_send_packet(HOST_CMD_SETMAC, dev->dev_addr, 6); 291 292 /* show it in the log as well */ 293 294 printk("%s: changed MAC to ", dev->name); 295 296 for (i = 0; i < 5; i++) 297 printk("%02X:", dev->dev_addr[i]); 298 299 printk("%02X\n", dev->dev_addr[i]); 300 301 return 0; 302} 303 304/* 305 * Open/initialize the board. This is called (in the current kernel) 306 * sometime after booting when the 'ifconfig' program is run. 307 * 308 * This routine should set everything up anew at each open, even 309 * registers that "should" only need to be set once at boot, so that 310 * there is non-reboot way to recover if something goes wrong. 311 */ 312 313static int 314e100_open(struct net_device *dev) 315{ 316 unsigned long flags; 317 318 /* configure the PAR0 (RX) and PAR1 (TX) ports 319 * 320 * perror is nAckReverse, which must be 1 at the TX side, 321 * and 0 at the RX side 322 * 323 * select is XFlag, which must be 1 at both sides 324 */ 325#ifdef ETHDEBUG 326 printk("Setting up PAR ports\n"); 327#endif 328 *R_PAR0_CONFIG = 329 /* We do not have an external buffer, don't care */ 330 IO_STATE(R_PAR0_CONFIG, ioe, noninv) | 331 /* Not connected, don't care */ 332 IO_STATE(R_PAR0_CONFIG, iseli, noninv) | 333 /* iautofd is not inverted, noninv */ 334 IO_STATE(R_PAR0_CONFIG, iautofd, noninv) | 335 /* Not used in reverse direction, don't care */ 336 IO_STATE(R_PAR0_CONFIG, istrb, noninv) | 337 /* Not connected, don't care */ 338 IO_STATE(R_PAR0_CONFIG, iinit, noninv) | 339 /* perror is GND and reverse wants 0, noninv */ 340 IO_STATE(R_PAR0_CONFIG, iperr, noninv) | 341 /* ack is not inverted, noninv */ 342 IO_STATE(R_PAR0_CONFIG, iack, noninv) | 343 /* busy is not inverted, noninv */ 344 IO_STATE(R_PAR0_CONFIG, ibusy, noninv) | 345 /* fault is not inverted, noninv */ 346 IO_STATE(R_PAR0_CONFIG, ifault, noninv) | 347 /* select is Vcc and we want 1, noninv */ 348 IO_STATE(R_PAR0_CONFIG, isel, noninv) | 349 /* We will run dma, enable */ 350 IO_STATE(R_PAR0_CONFIG, dma, enable) | 351 /* No run length encoding, disable */ 352 IO_STATE(R_PAR0_CONFIG, rle_in, disable) | 353 /* No run length encoding, disable */ 354 IO_STATE(R_PAR0_CONFIG, rle_out, disable) | 355 /* Enable parallel port */ 356 IO_STATE(R_PAR0_CONFIG, enable, on) | 357 /* Force mode regardless of pin status */ 358 IO_STATE(R_PAR0_CONFIG, force, on) | 359 /* We want ECP forward mode since PAR0 is RX */ 360 IO_STATE(R_PAR0_CONFIG, mode, ecp_rev); 361 362 *R_PAR1_CONFIG = 363 /* We do not have an external buffer, don't care */ 364 IO_STATE(R_PAR1_CONFIG, ioe, noninv) | 365 366 /* Not connected, don't care */ 367 IO_STATE(R_PAR1_CONFIG, iseli, noninv) | 368 369 /* HostAck must indicate data cycle, noninv */ 370 IO_STATE(R_PAR1_CONFIG, iautofd, noninv) | 371 372 /* HostClk has no external inverter, noninv */ 373 IO_STATE(R_PAR1_CONFIG, istrb, noninv) | 374 375 /* Not connected, don't care */ 376 IO_STATE(R_PAR1_CONFIG, iinit, noninv) | 377 378 /* nAckReverse must be 1 in forward mode but is grounded, inv */ 379 IO_STATE(R_PAR1_CONFIG, iperr, inv) | 380 381 /* PeriphClk must be 1 in forward mode, noninv */ 382 IO_STATE(R_PAR1_CONFIG, iack, noninv) | 383 384 /* PeriphAck has no external inverter, noninv */ 385 IO_STATE(R_PAR1_CONFIG, ibusy, noninv) | 386 387 /* nPerihpRequest has no external inverter, noniv */ 388 IO_STATE(R_PAR1_CONFIG, ifault, noninv) | 389 390 /* Select is VCC and we want 1, noninv */ 391 IO_STATE(R_PAR1_CONFIG, isel, noninv) | 392 393 /* No EPP mode, disable */ 394 IO_STATE(R_PAR1_CONFIG, ext_mode, disable) | 395 396 /* We will run dma, enable */ 397 IO_STATE(R_PAR1_CONFIG, dma, enable) | 398 399 /* No run length encoding, disable */ 400 IO_STATE(R_PAR1_CONFIG, rle_in, disable) | 401 402 /* No run length encoding, disable */ 403 IO_STATE(R_PAR1_CONFIG, rle_out, disable) | 404 405 /* Enable parallel port */ 406 IO_STATE(R_PAR1_CONFIG, enable, on) | 407 408 /* Force mode regardless of pin status */ 409 IO_STATE(R_PAR1_CONFIG, force, on) | 410 411 /* We want ECP forward mode since PAR1 is TX */ 412 IO_STATE(R_PAR1_CONFIG, mode, ecp_fwd); 413 414 /* Setup time of value * 160 + 20 ns == 20 ns below */ 415 *R_PAR1_DELAY = IO_FIELD(R_PAR1_DELAY, setup, 0); 416 417 *R_PAR1_CTRL = 0; 418 419 while ((((*R_PAR1_STATUS)&0xE000) >> 13) != 5); /* Wait for ECP_FWD mode */ 420#ifdef ETHDEBUG 421 dump_parport_status(); 422#endif 423 424 /* make sure ECP irq is acked when we enable it below */ 425 426 (void)*R_PAR0_STATUS_DATA; 427 (void)*R_PAR1_STATUS_DATA; 428 429 /* Reset and wait for the DMA channels */ 430 431 RESET_DMA(4); /* PAR1_TX_DMA_NBR */ 432 RESET_DMA(3); /* PAR0_RX_DMA_NBR */ 433 WAIT_DMA(4); 434 WAIT_DMA(3); 435 436 /* boot the slave Etrax, by sending code on PAR1. 437 * do this before we start up the IRQ handlers and stuff, 438 * beacuse we simply poll for completion in boot_slave. 439 */ 440 441 boot_slave(&e100lpslaveprog); 442 443 /* allocate the irq corresponding to the receiving DMA */ 444 445 if (request_irq(DMA3_RX_IRQ_NBR, e100rx_interrupt, 0, 446 cardname, (void *)dev)) { 447 printk("Failed to allocate DMA3_RX_IRQ_NBR\n"); 448 goto grace_exit; 449 } 450 451 /* allocate the irq corresponding to the transmitting DMA */ 452 453 if (request_irq(DMA4_TX_IRQ_NBR, e100tx_interrupt, 0, 454 cardname, (void *)dev)) { 455 printk("Failed to allocate DMA4_TX_IRQ_NBR\n"); 456 goto grace_exit; 457 } 458 459 /* allocate the irq used for detecting ECP commands on the RX port (PAR0) */ 460 461 if (request_irq(PAR0_ECP_IRQ_NBR, ecp_interrupt, 0, 462 cardname, (void *)dev)) { 463 printk("Failed to allocate PAR0_ECP_IRQ_NBR\n"); 464 grace_exit: 465 free_irq(PAR0_ECP_IRQ_NBR, (void *)dev); 466 free_irq(DMA4_TX_IRQ_NBR, (void *)dev); 467 free_irq(DMA3_RX_IRQ_NBR, (void *)dev); 468 469 return -EAGAIN; 470 } 471 472 473#ifdef ETHDEBUG 474 printk("Par port IRQ and DMA allocated\n"); 475#endif 476 save_flags(flags); 477 cli(); 478 479 /* enable the irq's for PAR0/1 DMA */ 480 481 *R_IRQ_MASK2_SET = 482 IO_STATE(R_IRQ_MASK2_SET, dma3_eop, set) | 483 IO_STATE(R_IRQ_MASK2_SET, dma4_descr, set); 484 485 *R_IRQ_MASK0_SET = 486 IO_STATE(R_IRQ_MASK0_SET, par0_ecp_cmd, set); 487 488 tx_skb = 0; 489 490 /* make sure the irqs are cleared */ 491 492 *R_DMA_CH3_CLR_INTR = IO_STATE(R_DMA_CH3_CLR_INTR, clr_eop, do); 493 *R_DMA_CH4_CLR_INTR = IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do); 494 495 /* Write the MAC address to the slave HW */ 496 udelay(5000); 497 e100_hardware_send_packet(HOST_CMD_SETMAC, dev->dev_addr, 6); 498 499 /* make sure the rec and transmit error counters are cleared */ 500 501 (void)*R_REC_COUNTERS; /* dummy read */ 502 (void)*R_TR_COUNTERS; /* dummy read */ 503 504 /* start the receiving DMA channel so we can receive packets from now on */ 505 506 *R_DMA_CH3_FIRST = virt_to_phys(myNextRxDesc); 507 *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, start); 508 509 restore_flags(flags); 510 511 /* We are now ready to accept transmit requeusts from 512 * the queueing layer of the networking. 513 */ 514#ifdef ETHDEBUG 515 printk("Starting slave network transmit queue\n"); 516#endif 517 netif_start_queue(dev); 518 519 return 0; 520} 521 522static void 523e100_reset_tranceiver(void) 524{ 525 /* To do: Reboot and setup slave Etrax */ 526} 527 528/* Called by upper layers if they decide it took too long to complete 529 * sending a packet - we need to reset and stuff. 530 */ 531 532static void 533e100_tx_timeout(struct net_device *dev) 534{ 535 struct net_local *np = (struct net_local *)dev->priv; 536 537 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name, 538 tx_done(dev) ? "IRQ problem" : "network cable problem"); 539 540 /* remember we got an error */ 541 542 np->stats.tx_errors++; 543 544 /* reset the TX DMA in case it has hung on something */ 545 546 RESET_DMA(4); 547 WAIT_DMA(4); 548 549 /* Reset the tranceiver. */ 550 551 e100_reset_tranceiver(); 552 553 /* and get rid of the packet that never got an interrupt */ 554 555 dev_kfree_skb(tx_skb); 556 tx_skb = 0; 557 558 /* tell the upper layers we're ok again */ 559 560 netif_wake_queue(dev); 561} 562 563 564/* This will only be invoked if the driver is _not_ in XOFF state. 565 * What this means is that we need not check it, and that this 566 * invariant will hold if we make sure that the netif_*_queue() 567 * calls are done at the proper times. 568 */ 569 570static int 571e100_send_packet(struct sk_buff *skb, struct net_device *dev) 572{ 573 struct net_local *np = (struct net_local *)dev->priv; 574 int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; 575 unsigned char *buf = skb->data; 576 577#ifdef ETHDEBUG 578 unsigned char *temp_data_ptr = buf; 579 int i; 580 581 printk("Sending a packet of length %d:\n", length); 582 /* dump the first bytes in the packet */ 583 for(i = 0; i < 8; i++) { 584 printk("%d: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n", i * 8, 585 temp_data_ptr[0],temp_data_ptr[1],temp_data_ptr[2], 586 temp_data_ptr[3],temp_data_ptr[4],temp_data_ptr[5], 587 temp_data_ptr[6],temp_data_ptr[7]); 588 temp_data_ptr += 8; 589 } 590#endif 591 spin_lock_irq(&np->lock); /* protect from tx_interrupt */ 592 593 tx_skb = skb; /* remember it so we can free it in the tx irq handler later */ 594 dev->trans_start = jiffies; 595 596 e100_hardware_send_packet(HOST_CMD_SENDPACK, buf, length); 597 598 /* this simple TX driver has only one send-descriptor so we're full 599 * directly. If this had a send-ring instead, we would only do this if 600 * the ring got full. 601 */ 602 603 netif_stop_queue(dev); 604 605 spin_unlock_irq(&np->lock); 606 607 return 0; 608} 609 610/* 611 * The typical workload of the driver: 612 * Handle the network interface interrupts. 613 */ 614 615static void 616e100rx_interrupt(int irq, void *dev_id, struct pt_regs * regs) 617{ 618 struct net_device *dev = (struct net_device *)dev_id; 619 unsigned long irqbits = *R_IRQ_MASK2_RD; 620 621 if(irqbits & IO_STATE(R_IRQ_MASK2_RD, dma3_eop, active)) { 622 623 /* acknowledge the eop interrupt */ 624 625 *R_DMA_CH3_CLR_INTR = IO_STATE(R_DMA_CH3_CLR_INTR, clr_eop, do); 626 627 /* check if one or more complete packets were indeed received */ 628 629 while(*R_DMA_CH3_FIRST != virt_to_phys(myNextRxDesc)) { 630 /* Take out the buffer and give it to the OS, then 631 * allocate a new buffer to put a packet in. 632 */ 633 e100_rx(dev); 634 ((struct net_local *)dev->priv)->stats.rx_packets++; 635 /* restart/continue on the channel, for safety */ 636 *R_DMA_CH3_CMD = IO_STATE(R_DMA_CH3_CMD, cmd, restart); 637 /* clear dma channel 3 eop/descr irq bits */ 638 *R_DMA_CH3_CLR_INTR = 639 IO_STATE(R_DMA_CH3_CLR_INTR, clr_eop, do) | 640 IO_STATE(R_DMA_CH3_CLR_INTR, clr_descr, do); 641 642 /* now, we might have gotten another packet 643 so we have to loop back and check if so */ 644 } 645 } 646} 647 648/* the transmit dma channel interrupt 649 * 650 * this is supposed to free the skbuff which was pending during transmission, 651 * and inform the kernel that we can send one more buffer 652 */ 653 654static void 655e100tx_interrupt(int irq, void *dev_id, struct pt_regs * regs) 656{ 657 struct net_device *dev = (struct net_device *)dev_id; 658 unsigned long irqbits = *R_IRQ_MASK2_RD; 659 struct net_local *np = (struct net_local *)dev->priv; 660 661#ifdef ETHDEBUG 662 printk("We got tx interrupt\n"); 663#endif 664 /* check for a dma4_eop interrupt */ 665 if(irqbits & IO_STATE(R_IRQ_MASK2_RD, dma4_descr, active)) { 666 /* This protects us from concurrent execution of 667 * our dev->hard_start_xmit function above. 668 */ 669 670 spin_lock(&np->lock); 671 672 /* acknowledge the eop interrupt */ 673 674 *R_DMA_CH4_CLR_INTR = IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do); 675 676 /* skip *R_DMA_CH4_FIRST == 0 test since we use d_wait... */ 677 if(tx_skb) { 678 679 np->stats.tx_bytes += tx_skb->len; 680 np->stats.tx_packets++; 681 /* dma is ready with the transmission of the data in tx_skb, so now we can release the skb memory */ 682 dev_kfree_skb_irq(tx_skb); 683 tx_skb = 0; 684 netif_wake_queue(dev); 685 } else { 686 printk(KERN_WARNING "%s: tx weird interrupt\n", 687 cardname); 688 } 689 690 spin_unlock(&np->lock); 691 } 692} 693 694static void 695ecp_interrupt(int irq, void *dev_id, struct pt_regs * regs) 696{ 697 struct net_device *dev = (struct net_device *)dev_id; 698 struct net_local *lp = (struct net_local *)dev->priv; 699 unsigned long temp, irqbits = *R_IRQ_MASK0_RD; 700 701 /* check for ecp irq */ 702 if(irqbits & IO_MASK(R_IRQ_MASK0_RD, par0_ecp_cmd)) { 703 /* acknowledge by reading the bit */ 704 temp = *R_PAR0_STATUS_DATA; 705 /* force an EOP on the incoming channel, so we'll get an rx interrupt */ 706 *R_SET_EOP = IO_STATE(R_SET_EOP, ch3_eop, set); 707 } 708} 709 710/* We have a good packet(s), get it/them out of the buffers. */ 711static void 712e100_rx(struct net_device *dev) 713{ 714 struct sk_buff *skb; 715 int length=0; 716 int i; 717 struct net_local *np = (struct net_local *)dev->priv; 718 struct etrax_dma_descr *mySaveRxDesc = myNextRxDesc; 719 unsigned char *skb_data_ptr; 720 721 /* If the packet is broken down in many small packages then merge 722 * count how much space we will need to alloc with skb_alloc() for 723 * it to fit. 724 */ 725 726 while (!(myNextRxDesc->status & d_eop)) { 727 length += myNextRxDesc->sw_len; /* use sw_len for the first descs */ 728 myNextRxDesc->status = 0; 729 myNextRxDesc = phys_to_virt(myNextRxDesc->next); 730 } 731 732 length += myNextRxDesc->hw_len; /* use hw_len for the last descr */ 733 734#ifdef ETHDEBUG 735 printk("Got a packet of length %d:\n", length); 736 /* dump the first bytes in the packet */ 737 skb_data_ptr = (unsigned char *)phys_to_virt(mySaveRxDesc->buf); 738 for(i = 0; i < 8; i++) { 739 printk("%d: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n", i * 8, 740 skb_data_ptr[0],skb_data_ptr[1],skb_data_ptr[2],skb_data_ptr[3], 741 skb_data_ptr[4],skb_data_ptr[5],skb_data_ptr[6],skb_data_ptr[7]); 742 skb_data_ptr += 8; 743 } 744#endif 745 746 skb = dev_alloc_skb(length - ETHER_HEAD_LEN); 747 if (!skb) { 748 np->stats.rx_errors++; 749 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", 750 dev->name); 751 return; 752 } 753 754 skb_put(skb, length - ETHER_HEAD_LEN); /* allocate room for the packet body */ 755 skb_data_ptr = skb_push(skb, ETHER_HEAD_LEN); /* allocate room for the header */ 756 757#ifdef ETHDEBUG 758 printk("head = 0x%x, data = 0x%x, tail = 0x%x, end = 0x%x\n", 759 skb->head, skb->data, skb->tail, skb->end); 760 printk("copying packet to 0x%x.\n", skb_data_ptr); 761#endif 762 763 /* this loop can be made using max two memcpy's if optimized */ 764 765 while(mySaveRxDesc != myNextRxDesc) { 766 memcpy(skb_data_ptr, phys_to_virt(mySaveRxDesc->buf), 767 mySaveRxDesc->sw_len); 768 skb_data_ptr += mySaveRxDesc->sw_len; 769 mySaveRxDesc = phys_to_virt(mySaveRxDesc->next); 770 } 771 772 memcpy(skb_data_ptr, phys_to_virt(mySaveRxDesc->buf), 773 mySaveRxDesc->hw_len); 774 775 skb->dev = dev; 776 skb->protocol = eth_type_trans(skb, dev); 777 778 /* Send the packet to the upper layers */ 779 780 netif_rx(skb); 781 782 /* Prepare for next packet */ 783 784 myNextRxDesc->status = 0; 785 myPrevRxDesc = myNextRxDesc; 786 myNextRxDesc = phys_to_virt(myNextRxDesc->next); 787 788 myPrevRxDesc->ctrl |= d_eol; 789 myLastRxDesc->ctrl &= ~d_eol; 790 myLastRxDesc = myPrevRxDesc; 791 792 return; 793} 794 795/* The inverse routine to net_open(). */ 796static int 797e100_close(struct net_device *dev) 798{ 799 struct net_local *np = (struct net_local *)dev->priv; 800 801 printk("Closing %s.\n", dev->name); 802 803 netif_stop_queue(dev); 804 805 *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, par0_ecp_cmd, clr); 806 807 *R_IRQ_MASK2_CLR = 808 IO_STATE(R_IRQ_MASK2_CLR, dma3_eop, clr) | 809 IO_STATE(R_IRQ_MASK2_CLR, dma4_descr, clr); 810 811 /* Stop the receiver and the transmitter */ 812 813 RESET_DMA(3); 814 RESET_DMA(4); 815 816 /* Flush the Tx and disable Rx here. */ 817 818 free_irq(DMA3_RX_IRQ_NBR, (void *)dev); 819 free_irq(DMA4_TX_IRQ_NBR, (void *)dev); 820 free_irq(PAR0_ECP_IRQ_NBR, (void *)dev); 821 822 free_dma(PAR1_TX_DMA_NBR); 823 free_dma(PAR0_RX_DMA_NBR); 824 825 /* Update the statistics here. */ 826 827 update_rx_stats(&np->stats); 828 update_tx_stats(&np->stats); 829 830 return 0; 831} 832 833static void 834update_rx_stats(struct net_device_stats *es) 835{ 836 unsigned long r = *R_REC_COUNTERS; 837 /* update stats relevant to reception errors */ 838 es->rx_fifo_errors += r >> 24; /* fifo overrun */ 839 es->rx_crc_errors += r & 0xff; /* crc error */ 840 es->rx_frame_errors += (r >> 8) & 0xff; /* alignment error */ 841 es->rx_length_errors += (r >> 16) & 0xff; /* oversized frames */ 842} 843 844static void 845update_tx_stats(struct net_device_stats *es) 846{ 847 unsigned long r = *R_TR_COUNTERS; 848 /* update stats relevant to transmission errors */ 849 es->collisions += (r & 0xff) + ((r >> 8) & 0xff); /* single_col + multiple_col */ 850 es->tx_errors += (r >> 24) & 0xff; /* deferred transmit frames */ 851} 852 853/* 854 * Get the current statistics. 855 * This may be called with the card open or closed. 856 */ 857static struct net_device_stats * 858e100_get_stats(struct net_device *dev) 859{ 860 struct net_local *lp = (struct net_local *)dev->priv; 861 862 update_rx_stats(&lp->stats); 863 update_tx_stats(&lp->stats); 864 865 return &lp->stats; 866} 867 868/* 869 * Set or clear the multicast filter for this adaptor. 870 * num_addrs == -1 Promiscuous mode, receive all packets 871 * num_addrs == 0 Normal mode, clear multicast list 872 * num_addrs > 0 Multicast mode, receive normal and MC packets, 873 * and do best-effort filtering. 874 */ 875static void 876set_multicast_list(struct net_device *dev) 877{ 878 /* To do */ 879} 880 881void 882e100_hardware_send_packet(unsigned long hostcmd, char *buf, int length) 883{ 884 static char bogus_ecp[] = { 42, 42 }; 885 int i; 886 887 888#ifdef ETHDEBUG 889 printk("e100 send pack, buf 0x%x len %d\n", buf, length); 890#endif 891 892 host_command = hostcmd; 893 894 /* Configure the tx dma descriptor. Desc 0 is already configured.*/ 895 896 TxDescList[1].sw_len = length; 897 TxDescList[1].ctrl = d_wait; 898 TxDescList[1].buf = virt_to_phys(buf); 899 TxDescList[1].next = virt_to_phys(&TxDescList[2]); 900 901 /* append the ecp dummy descriptor - its only purpose is to 902 * make the receiver generate an irq due to the ecp command 903 * so the receiver knows where packets end 904 */ 905 906 TxDescList[2].sw_len = 1; 907 TxDescList[2].ctrl = d_ecp | d_eol | d_int; 908 TxDescList[2].buf = virt_to_phys(bogus_ecp); 909 910 911 /* setup the dma channel and start it */ 912 913 *R_DMA_CH4_FIRST = virt_to_phys(TxDescList); 914 *R_DMA_CH4_CMD = IO_STATE(R_DMA_CH4_CMD, cmd, start); 915 916#ifdef ETHDEBUG 917 printk("done\n"); 918#endif 919} 920 921/* send a chunk of code to the slave chip to boot it. */ 922 923static void 924boot_slave(unsigned char *code) 925{ 926 int i; 927 928#ifdef ETHDEBUG 929 printk(" booting slave ETRAX...\n"); 930#endif 931 *R_PORT_PB_DATA = 0x7F; /* Reset slave */ 932 udelay(15); /* Time enough to reset WAN tranciever */ 933 *R_PORT_PB_DATA = 0xFF; /* Reset slave */ 934 935 /* configure the tx dma data descriptor */ 936 937 TxDescList[1].sw_len = ETRAX_PAR_BOOT_LENGTH; 938 TxDescList[1].ctrl = d_eol | d_int; 939 940 TxDescList[1].buf = virt_to_phys(code); 941 TxDescList[1].next = 0; 942 943 /* setup the dma channel and start it */ 944 *R_DMA_CH4_FIRST = virt_to_phys(&TxDescList[1]); 945 *R_DMA_CH4_CMD = IO_STATE(R_DMA_CH4_CMD, cmd, start); 946 947 /* wait for completion */ 948 while(!(*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma4_descr))); 949 950 /* ack the irq */ 951 952 *R_DMA_CH4_CLR_INTR = IO_STATE(R_DMA_CH4_CLR_INTR, clr_descr, do); 953 954 955#ifdef ETHDEBUG 956 printk(" done\n"); 957#endif 958} 959 960#ifdef ETHDEBUG 961/* debug code to check the current status of PAR1 */ 962static void 963dump_parport_status(void) 964{ 965 unsigned long temp; 966 967 printk("Parport1 status:\n"); 968 969 temp = (*R_PAR1_STATUS)&0xE000; 970 temp = temp >> 13; 971 printk("Reg mode: %u (ecp_fwd(5), ecp_rev(6))\n", temp); 972 973 temp = (*R_PAR1_STATUS)&0x1000; 974 temp = temp >> 12; 975 printk("Reg perr: %u (ecp_rev(0))\n", temp); 976 977 temp = (*R_PAR1_STATUS)&0x0800; 978 temp = temp >> 11; 979 printk("Reg ack: %u (inactive (1), active (0))\n", temp); 980 981 temp = (*R_PAR1_STATUS)&0x0400; 982 temp = temp >> 10; 983 printk("Reg busy: %u (inactive (0), active (1))\n", temp); 984 985 temp = (*R_PAR1_STATUS)&0x0200; 986 temp = temp >> 9; 987 printk("Reg fault: %u (inactive (1), active (0))\n", temp); 988 989 temp = (*R_PAR1_STATUS)&0x0100; 990 temp = temp >> 8; 991 printk("Reg sel: %u (inactive (0), active (1), xflag(1))\n", temp); 992 993 temp = (*R_PAR1_STATUS)&0x02; 994 temp = temp >> 1; 995 printk("Reg tr_rdy: %u (busy (0), ready (1))\n", temp); 996 997} 998#endif /* ETHDEBUG */ 999 1000static struct net_device dev_etrax_slave_ethernet; 1001 1002static int 1003etrax_init_module(void) 1004{ 1005 struct net_device *d = &dev_etrax_slave_ethernet; 1006 1007 d->init = etrax_ethernet_lpslave_init; 1008 1009 if(register_netdev(d) == 0) 1010 return 0; 1011 else 1012 return -ENODEV; 1013} 1014 1015module_init(etrax_init_module); 1016