aboutsummaryrefslogtreecommitdiffstats
path: root/arch/microblaze/include
stat options
Period:
Authors:

Commits per author per week (path 'arch/microblaze/include')

AuthorW35 2025W36 2025W37 2025W38 2025Total
Total00000
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-15 16:32:56 -0400
a> 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 
/* atari_pamsnet.c     PAMsNet device driver for linux68k.
 *
 * Version:	@(#)PAMsNet.c	0.2ß	03/31/96
 *
 * Author:  Torsten Lang <Torsten.Lang@ap.physik.uni-giessen.de>
 *                       <Torsten.Lang@jung.de>
 *
 * This driver is based on my driver PAMSDMA.c for MiNT-Net and
 * on the driver bionet.c written by
 *          Hartmut Laue <laue@ifk-mp.uni-kiel.de>
 * and      Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
 *
 * Little adaptions for integration into pl7 by Roman Hodek
 *
	What is it ?
	------------
	This driver controls the PAMsNet LAN-Adapter which connects
	an ATARI ST/TT via the ACSI-port to an Ethernet-based network.

	This version can be compiled as a loadable module (See the
	compile command at the bottom of this file).
	At load time, you can optionally set the debugging level and the
	fastest response time on the command line of 'insmod'.

	'pamsnet_debug'
		controls the amount of diagnostic messages:
	  0  : no messages
	  >0 : see code for meaning of printed messages

	'pamsnet_min_poll_time' (always >=1)
		gives the time (in jiffies) between polls. Low values
		increase the system load (beware!)

	When loaded, a net device with the name 'eth?' becomes available,
	which can be controlled with the usual 'ifconfig' command.

	It is possible to compile this driver into the kernel like other
	(net) drivers. For this purpose, some source files (e.g. config-files
	makefiles, Space.c) must be changed accordingly. (You may refer to
	other drivers how to do it.) In this case, the device will be detected
	at boot time and (probably) appear as 'eth0'.

	Theory of Operation
	-------------------
	Because the ATARI DMA port is usually shared between several
	devices (eg. harddisk, floppy) we cannot block the ACSI bus
	while waiting for interrupts. Therefore we use a polling mechanism
	to fetch packets from the adapter. For the same reason, we send
	packets without checking that the previous packet has been sent to
	the LAN. We rely on the higher levels of the networking code to detect
	missing packets and resend them.

	Before we access the ATARI DMA controller, we check if another
	process is using the DMA. If not, we lock the DMA, perform one or
	more packet transfers and unlock the DMA before returning.
	We do not use 'stdma_lock' unconditionally because it is unclear
	if the networking code can be set to sleep, which will happen if
	another (possibly slow) device is using the DMA controller.

	The polling is done via timer interrupts which periodically
	'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
	between polls varies depending on an estimate of the net activity.
	The allowed range is given by the variable 'bionet_min_poll_time'
	for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
	for the higher (slowest) limit.

	Whenever a packet arrives, we switch to fastest response by setting
	the polling time to its lowest limit. If the following poll fails,
	because no packets have arrived, we increase the time for the next
	poll. When the net activity is low, the polling time effectively
	stays at its maximum value, resulting in the lowest load for the
	machine.
 */

#define MAX_POLL_TIME	10

static char *version =
	"pamsnet.c:v0.2beta 30-mar-96 (c) Torsten Lang.\n";

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/errno.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>
#include <asm/atari_acsi.h>

#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/init.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#undef READ
#undef WRITE

/* use 0 for production, 1 for verification, >2 for debug
 */
#ifndef NET_DEBUG
#define NET_DEBUG 0
#endif
/*
 * Global variable 'pamsnet_debug'. Can be set at load time by 'insmod'
 */
unsigned int pamsnet_debug = NET_DEBUG;
MODULE_PARM(pamsnet_debug, "i");
MODULE_PARM_DESC(pamsnet_debug, "pamsnet debug enable (0-1)");
MODULE_LICENSE("GPL");

static unsigned int pamsnet_min_poll_time = 2;


/* Information that need to be kept for each board.
 */
struct net_local {
	struct net_device_stats stats;
	long open_time;			/* for debugging */
	int  poll_time;			/* polling time varies with net load */
};

static struct nic_pkt_s {		/* packet format */
	unsigned char	buffer[2048];
} *nic_packet = 0;
unsigned char *phys_nic_packet;

typedef unsigned char HADDR[6]; /* 6-byte hardware address of lance */

/* Index to functions, as function prototypes.
 */
static void	start (int target);
static int	stop (int target);
static int	testpkt (int target);
static int	sendpkt (int target, unsigned char *buffer, int length);
static int	receivepkt (int target, unsigned char *buffer);
static int	inquiry (int target, unsigned char *buffer);
static HADDR	*read_hw_addr(int target, unsigned char *buffer);
static void	setup_dma (void *address, unsigned rw_flag, int num_blocks);
static int	send_first (int target, unsigned char byte);
static int	send_1_5 (int lun, unsigned char *command, int dma);
static int	get_status (void);
static int	calc_received (void *start_address);

static int pamsnet_open(struct net_device *dev);
static int pamsnet_send_packet(struct sk_buff *skb, struct net_device *dev);
static void pamsnet_poll_rx(struct net_device *);
static int pamsnet_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);
static void pamsnet_tick(unsigned long);

static irqreturn_t pamsnet_intr(int irq, void *data, struct pt_regs *fp);

static DEFINE_TIMER(pamsnet_timer, pamsnet_tick, 0, 0);

#define STRAM_ADDR(a)	(((a) & 0xff000000) == 0)

typedef struct
{
	unsigned char reserved1[0x38];
	HADDR  hwaddr;
	unsigned char reserved2[0x1c2];
} DMAHWADDR;

/*
 * Definitions of commands understood by the PAMs DMA adaptor.
 *
 * In general the DMA adaptor uses LUN 0, 5, 6 and 7 on one ID changeable
 * by the PAM's Net software.
 *
 * LUN 0 works as a harddisk. You can boot the PAM's Net driver there.
 * LUN 5 works as a harddisk and lets you access the RAM and some I/O HW
 *       area. In sector 0, bytes 0x38-0x3d you find the ethernet HW address
 *       of the adaptor.
 * LUN 6 works as a harddisk and lets you access the firmware ROM.
 * LUN 7 lets you send and receive packets.
 *
 * Some commands like the INQUIRY command work identical on all used LUNs.
 *
 * UNKNOWN1 seems to read some data.
 *          Command length is 6 bytes.
 * UNKNOWN2 seems to read some data (command byte 1 must be !=0). The
 *          following bytes seem to be something like an allocation length.
 *          Command length is 6 bytes.
 * READPKT  reads a packet received by the DMA adaptor.
 *          Command length is 6 bytes.
 * WRITEPKT sends a packet transferred by the following DMA phase. The length
 *          of the packet is transferred in command bytes 3 and 4.
 *          The adaptor automatically replaces the src hw address in an ethernet
 *          packet by its own hw address.
 *          Command length is 6 bytes.
 * INQUIRY  has the same function as the INQUIRY command supported by harddisks
 *          and other SCSI devices. It lets you detect which device you found
 *          at a given address.
 *          Command length is 6 bytes.
 * START    initializes the DMA adaptor. After this command it is able to send
 *          and receive packets. There is no status byte returned!
 *          Command length is 1 byte.
 * NUMPKTS  gives back the number of received packets waiting in the queue in
 *          the status byte.
 *          Command length is 1 byte.
 * UNKNOWN3
 * UNKNOWN4 Function of these three commands is unknown.
 * UNKNOWN5 The command length of these three commands is 1 byte.
 * DESELECT immediately deselects the DMA adaptor. May important with interrupt
 *          driven operation.
 *          Command length is 1 byte.
 * STOP     resets the DMA adaptor. After this command packets can no longer
 *          be received or transferred.
 *          Command length is 6 byte.
 */

enum {UNKNOWN1=3, READPKT=8, UNKNOWN2, WRITEPKT=10, INQUIRY=18, START,
      NUMPKTS=22, UNKNOWN3, UNKNOWN4, UNKNOWN5, DESELECT, STOP};

#define READSECTOR  READPKT
#define WRITESECTOR WRITEPKT

u_char *inquire8="MV      PAM's NET/GK";

#define DMALOW   dma_wd.dma_lo
#define DMAMID   dma_wd.dma_md
#define DMAHIGH  dma_wd.dma_hi
#define DACCESS  dma_wd.fdc_acces_seccount

#define MFP_GPIP mfp.par_dt_reg

/* Some useful functions */

#define INT      (!(MFP_GPIP & 0x20))
#define DELAY ({MFP_GPIP; MFP_GPIP; MFP_GPIP;})
#define WRITEMODE(value)					\
	({	u_short dummy = value;				\
		__asm__ volatile("movew %0, 0xFFFF8606" : : "d"(dummy));	\
		DELAY;						\
	})
#define WRITEBOTH(value1, value2)				\
	({	u_long dummy = (u_long)(value1)<<16 | (u_short)(value2);	\
		__asm__ volatile("movel %0, 0xFFFF8604" : : "d"(dummy));	\
		DELAY;						\
	})

/* Definitions for DMODE */

#define READ        0x000
#define WRITE       0x100

#define DMA_FDC     0x080
#define DMA_ACSI    0x000

#define DMA_DISABLE 0x040

#define SEC_COUNT   0x010
#define DMA_WINDOW  0x000

#define REG_ACSI    0x008
#define REG_FDC     0x000

#define A1          0x002

/* Timeout constants */

#define TIMEOUTCMD HZ/2   /* ca. 500ms */
#define TIMEOUTDMA HZ     /* ca. 1s */
#define COMMAND_DELAY 500 /* ca. 0.5ms */

unsigned rw;
int lance_target = -1;
int if_up = 0;

/* The following routines access the ethernet board connected to the
 * ACSI port via the st_dma chip.
 */

/* The following lowlevel routines work on physical addresses only and assume
 * that eventually needed buffers are
 * - completely located in ST RAM
 * - are contigous in the physical address space
 */

/* Setup the DMA counter */

static void
setup_dma (address, rw_flag, num_blocks)
	void *address;
	unsigned rw_flag;
	int num_blocks;
{
	WRITEMODE((unsigned) rw_flag          | DMA_FDC | SEC_COUNT | REG_ACSI |
		  A1);
	WRITEMODE((unsigned)(rw_flag ^ WRITE) | DMA_FDC | SEC_COUNT | REG_ACSI |
		  A1);
	WRITEMODE((unsigned) rw_flag          | DMA_FDC | SEC_COUNT | REG_ACSI |
		  A1);
	DMALOW  = (unsigned char)((unsigned long)address & 0xFF);
	DMAMID  = (unsigned char)(((unsigned long)address >>  8) & 0xFF);
	DMAHIGH = (unsigned char)(((unsigned long)address >> 16) & 0xFF);
	WRITEBOTH((unsigned)num_blocks & 0xFF,
		  rw_flag | DMA_FDC | DMA_WINDOW | REG_ACSI | A1);
	rw = rw_flag;
}

/* Send the first byte of an command block */

static int
send_first (target, byte)
	int target;
	unsigned char byte;
{
	rw = READ;
	acsi_delay_end(COMMAND_DELAY);
	/*
	 * wake up ACSI
	 */
	WRITEMODE(DMA_FDC | DMA_WINDOW | REG_ACSI);
	/*
	 * write command byte
	 */
	WRITEBOTH((target << 5) | (byte & 0x1F), DMA_FDC |
	          DMA_WINDOW | REG_ACSI | A1);
	return (!acsi_wait_for_IRQ(TIMEOUTCMD));