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-rw-r--r--drivers/net/atari_pamsnet.c878
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diff --git a/drivers/net/atari_pamsnet.c b/drivers/net/atari_pamsnet.c
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1/* atari_pamsnet.c PAMsNet device driver for linux68k.
2 *
3 * Version: @(#)PAMsNet.c 0.2ß 03/31/96
4 *
5 * Author: Torsten Lang <Torsten.Lang@ap.physik.uni-giessen.de>
6 * <Torsten.Lang@jung.de>
7 *
8 * This driver is based on my driver PAMSDMA.c for MiNT-Net and
9 * on the driver bionet.c written by
10 * Hartmut Laue <laue@ifk-mp.uni-kiel.de>
11 * and Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
12 *
13 * Little adaptions for integration into pl7 by Roman Hodek
14 *
15 What is it ?
16 ------------
17 This driver controls the PAMsNet LAN-Adapter which connects
18 an ATARI ST/TT via the ACSI-port to an Ethernet-based network.
19
20 This version can be compiled as a loadable module (See the
21 compile command at the bottom of this file).
22 At load time, you can optionally set the debugging level and the
23 fastest response time on the command line of 'insmod'.
24
25 'pamsnet_debug'
26 controls the amount of diagnostic messages:
27 0 : no messages
28 >0 : see code for meaning of printed messages
29
30 'pamsnet_min_poll_time' (always >=1)
31 gives the time (in jiffies) between polls. Low values
32 increase the system load (beware!)
33
34 When loaded, a net device with the name 'eth?' becomes available,
35 which can be controlled with the usual 'ifconfig' command.
36
37 It is possible to compile this driver into the kernel like other
38 (net) drivers. For this purpose, some source files (e.g. config-files
39 makefiles, Space.c) must be changed accordingly. (You may refer to
40 other drivers how to do it.) In this case, the device will be detected
41 at boot time and (probably) appear as 'eth0'.
42
43 Theory of Operation
44 -------------------
45 Because the ATARI DMA port is usually shared between several
46 devices (eg. harddisk, floppy) we cannot block the ACSI bus
47 while waiting for interrupts. Therefore we use a polling mechanism
48 to fetch packets from the adapter. For the same reason, we send
49 packets without checking that the previous packet has been sent to
50 the LAN. We rely on the higher levels of the networking code to detect
51 missing packets and resend them.
52
53 Before we access the ATARI DMA controller, we check if another
54 process is using the DMA. If not, we lock the DMA, perform one or
55 more packet transfers and unlock the DMA before returning.
56 We do not use 'stdma_lock' unconditionally because it is unclear
57 if the networking code can be set to sleep, which will happen if
58 another (possibly slow) device is using the DMA controller.
59
60 The polling is done via timer interrupts which periodically
61 'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
62 between polls varies depending on an estimate of the net activity.
63 The allowed range is given by the variable 'bionet_min_poll_time'
64 for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
65 for the higher (slowest) limit.
66
67 Whenever a packet arrives, we switch to fastest response by setting
68 the polling time to its lowest limit. If the following poll fails,
69 because no packets have arrived, we increase the time for the next
70 poll. When the net activity is low, the polling time effectively
71 stays at its maximum value, resulting in the lowest load for the
72 machine.
73 */
74
75#define MAX_POLL_TIME 10
76
77static char *version =
78 "pamsnet.c:v0.2beta 30-mar-96 (c) Torsten Lang.\n";
79
80#include <linux/module.h>
81
82#include <linux/kernel.h>
83#include <linux/jiffies.h>
84#include <linux/types.h>
85#include <linux/fcntl.h>
86#include <linux/interrupt.h>
87#include <linux/ioport.h>
88#include <linux/in.h>
89#include <linux/slab.h>
90#include <linux/string.h>
91#include <linux/bitops.h>
92#include <asm/system.h>
93#include <asm/pgtable.h>
94#include <asm/io.h>
95#include <asm/dma.h>
96#include <linux/errno.h>
97#include <asm/atarihw.h>
98#include <asm/atariints.h>
99#include <asm/atari_stdma.h>
100#include <asm/atari_acsi.h>
101
102#include <linux/delay.h>
103#include <linux/timer.h>
104#include <linux/init.h>
105
106#include <linux/netdevice.h>
107#include <linux/etherdevice.h>
108#include <linux/skbuff.h>
109
110#undef READ
111#undef WRITE
112
113/* use 0 for production, 1 for verification, >2 for debug
114 */
115#ifndef NET_DEBUG
116#define NET_DEBUG 0
117#endif
118/*
119 * Global variable 'pamsnet_debug'. Can be set at load time by 'insmod'
120 */
121unsigned int pamsnet_debug = NET_DEBUG;
122module_param(pamsnet_debug, int, 0);
123MODULE_PARM_DESC(pamsnet_debug, "pamsnet debug enable (0-1)");
124MODULE_LICENSE("GPL");
125
126static unsigned int pamsnet_min_poll_time = 2;
127
128
129/* Information that need to be kept for each board.
130 */
131struct net_local {
132 struct net_device_stats stats;
133 long open_time; /* for debugging */
134 int poll_time; /* polling time varies with net load */
135};
136
137static struct nic_pkt_s { /* packet format */
138 unsigned char buffer[2048];
139} *nic_packet = 0;
140unsigned char *phys_nic_packet;
141
142typedef unsigned char HADDR[6]; /* 6-byte hardware address of lance */
143
144/* Index to functions, as function prototypes.
145 */
146static void start (int target);
147static int stop (int target);
148static int testpkt (int target);
149static int sendpkt (int target, unsigned char *buffer, int length);
150static int receivepkt (int target, unsigned char *buffer);
151static int inquiry (int target, unsigned char *buffer);
152static HADDR *read_hw_addr(int target, unsigned char *buffer);
153static void setup_dma (void *address, unsigned rw_flag, int num_blocks);
154static int send_first (int target, unsigned char byte);
155static int send_1_5 (int lun, unsigned char *command, int dma);
156static int get_status (void);
157static int calc_received (void *start_address);
158
159static int pamsnet_open(struct net_device *dev);
160static int pamsnet_send_packet(struct sk_buff *skb, struct net_device *dev);
161static void pamsnet_poll_rx(struct net_device *);
162static int pamsnet_close(struct net_device *dev);
163static struct net_device_stats *net_get_stats(struct net_device *dev);
164static void pamsnet_tick(unsigned long);
165
166static irqreturn_t pamsnet_intr(int irq, void *data);
167
168static DEFINE_TIMER(pamsnet_timer, pamsnet_tick, 0, 0);
169
170#define STRAM_ADDR(a) (((a) & 0xff000000) == 0)
171
172typedef struct
173{
174 unsigned char reserved1[0x38];
175 HADDR hwaddr;
176 unsigned char reserved2[0x1c2];
177} DMAHWADDR;
178
179/*
180 * Definitions of commands understood by the PAMs DMA adaptor.
181 *
182 * In general the DMA adaptor uses LUN 0, 5, 6 and 7 on one ID changeable
183 * by the PAM's Net software.
184 *
185 * LUN 0 works as a harddisk. You can boot the PAM's Net driver there.
186 * LUN 5 works as a harddisk and lets you access the RAM and some I/O HW
187 * area. In sector 0, bytes 0x38-0x3d you find the ethernet HW address
188 * of the adaptor.
189 * LUN 6 works as a harddisk and lets you access the firmware ROM.
190 * LUN 7 lets you send and receive packets.
191 *
192 * Some commands like the INQUIRY command work identical on all used LUNs.
193 *
194 * UNKNOWN1 seems to read some data.
195 * Command length is 6 bytes.
196 * UNKNOWN2 seems to read some data (command byte 1 must be !=0). The
197 * following bytes seem to be something like an allocation length.
198 * Command length is 6 bytes.
199 * READPKT reads a packet received by the DMA adaptor.
200 * Command length is 6 bytes.
201 * WRITEPKT sends a packet transferred by the following DMA phase. The length
202 * of the packet is transferred in command bytes 3 and 4.
203 * The adaptor automatically replaces the src hw address in an ethernet
204 * packet by its own hw address.
205 * Command length is 6 bytes.
206 * INQUIRY has the same function as the INQUIRY command supported by harddisks
207 * and other SCSI devices. It lets you detect which device you found
208 * at a given address.
209 * Command length is 6 bytes.
210 * START initializes the DMA adaptor. After this command it is able to send
211 * and receive packets. There is no status byte returned!
212 * Command length is 1 byte.
213 * NUMPKTS gives back the number of received packets waiting in the queue in
214 * the status byte.
215 * Command length is 1 byte.
216 * UNKNOWN3
217 * UNKNOWN4 Function of these three commands is unknown.
218 * UNKNOWN5 The command length of these three commands is 1 byte.
219 * DESELECT immediately deselects the DMA adaptor. May important with interrupt
220 * driven operation.
221 * Command length is 1 byte.
222 * STOP resets the DMA adaptor. After this command packets can no longer
223 * be received or transferred.
224 * Command length is 6 byte.
225 */
226
227enum {UNKNOWN1=3, READPKT=8, UNKNOWN2, WRITEPKT=10, INQUIRY=18, START,
228 NUMPKTS=22, UNKNOWN3, UNKNOWN4, UNKNOWN5, DESELECT, STOP};
229
230#define READSECTOR READPKT
231#define WRITESECTOR WRITEPKT
232
233u_char *inquire8="MV PAM's NET/GK";
234
235#define DMALOW dma_wd.dma_lo
236#define DMAMID dma_wd.dma_md
237#define DMAHIGH dma_wd.dma_hi
238#define DACCESS dma_wd.fdc_acces_seccount
239
240#define MFP_GPIP mfp.par_dt_reg
241
242/* Some useful functions */
243
244#define INT (!(MFP_GPIP & 0x20))
245#define DELAY ({MFP_GPIP; MFP_GPIP; MFP_GPIP;})
246#define WRITEMODE(value) \
247 ({ u_short dummy = value; \
248 __asm__ volatile("movew %0, 0xFFFF8606" : : "d"(dummy)); \
249 DELAY; \
250 })
251#define WRITEBOTH(value1, value2) \
252 ({ u_long dummy = (u_long)(value1)<<16 | (u_short)(value2); \
253 __asm__ volatile("movel %0, 0xFFFF8604" : : "d"(dummy)); \
254 DELAY; \
255 })
256
257/* Definitions for DMODE */
258
259#define READ 0x000
260#define WRITE 0x100
261
262#define DMA_FDC 0x080
263#define DMA_ACSI 0x000
264
265#define DMA_DISABLE 0x040
266
267#define SEC_COUNT 0x010
268#define DMA_WINDOW 0x000
269
270#define REG_ACSI 0x008
271#define REG_FDC 0x000
272
273#define A1 0x002
274
275/* Timeout constants */
276
277#define TIMEOUTCMD HZ/2 /* ca. 500ms */
278#define TIMEOUTDMA HZ /* ca. 1s */
279#define COMMAND_DELAY 500 /* ca. 0.5ms */
280
281unsigned rw;
282int lance_target = -1;
283int if_up = 0;
284
285/* The following routines access the ethernet board connected to the
286 * ACSI port via the st_dma chip.
287 */
288
289/* The following lowlevel routines work on physical addresses only and assume
290 * that eventually needed buffers are
291 * - completely located in ST RAM
292 * - are contigous in the physical address space
293 */
294
295/* Setup the DMA counter */
296
297static void
298setup_dma (void *address, unsigned rw_flag, int num_blocks)
299{
300 WRITEMODE((unsigned) rw_flag | DMA_FDC | SEC_COUNT | REG_ACSI |
301 A1);
302 WRITEMODE((unsigned)(rw_flag ^ WRITE) | DMA_FDC | SEC_COUNT | REG_ACSI |
303 A1);
304 WRITEMODE((unsigned) rw_flag | DMA_FDC | SEC_COUNT | REG_ACSI |
305 A1);
306 DMALOW = (unsigned char)((unsigned long)address & 0xFF);
307 DMAMID = (unsigned char)(((unsigned long)address >> 8) & 0xFF);
308 DMAHIGH = (unsigned char)(((unsigned long)address >> 16) & 0xFF);
309 WRITEBOTH((unsigned)num_blocks & 0xFF,
310 rw_flag | DMA_FDC | DMA_WINDOW | REG_ACSI | A1);
311 rw = rw_flag;
312}
313
314/* Send the first byte of an command block */
315
316static int
317send_first (int target, unsigned char byte)
318{
319 rw = READ;
320 acsi_delay_end(COMMAND_DELAY);
321 /*
322 * wake up ACSI
323 */
324 WRITEMODE(DMA_FDC | DMA_WINDOW | REG_ACSI);
325 /*
326 * write command byte
327 */
328 WRITEBOTH((target << 5) | (byte & 0x1F), DMA_FDC |
329 DMA_WINDOW | REG_ACSI | A1);
330 return (!acsi_wait_for_IRQ(TIMEOUTCMD));
331}
332
333/* Send the rest of an command block */
334
335static int
336send_1_5 (int lun, unsigned char *command, int dma)
337{
338 int i, j;
339
340 for (i=0; i<5; i++) {
341 WRITEBOTH((!i ? (((lun & 0x7) << 5) | (command[i] & 0x1F))
342 : command[i]),
343 rw | REG_ACSI | DMA_WINDOW |
344 ((i < 4) ? DMA_FDC
345 : (dma ? DMA_ACSI
346 : DMA_FDC)) | A1);
347 if (i < 4 && (j = !acsi_wait_for_IRQ(TIMEOUTCMD)))
348 return (j);
349 }
350 return (0);
351}
352
353/* Read a status byte */
354
355static int
356get_status (void)
357{
358 WRITEMODE(DMA_FDC | DMA_WINDOW | REG_ACSI | A1);
359 acsi_delay_start();
360 return ((int)(DACCESS & 0xFF));
361}
362
363/* Calculate the number of received bytes */
364
365static int
366calc_received (void *start_address)
367{
368 return (int)(
369 (((unsigned long)DMAHIGH << 16) | ((unsigned)DMAMID << 8) | DMALOW)
370 - (unsigned long)start_address);
371}
372
373/* The following midlevel routines still work on physical addresses ... */
374
375/* start() starts the PAM's DMA adaptor */
376
377static void
378start (int target)
379{
380 send_first(target, START);
381}
382
383/* stop() stops the PAM's DMA adaptor and returns a value of zero in case of success */
384
385static int
386stop (int target)
387{
388 int ret = -1;
389 unsigned char cmd_buffer[5];
390
391 if (send_first(target, STOP))
392 goto bad;
393 cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] =
394 cmd_buffer[3] = cmd_buffer[4] = 0;
395 if (send_1_5(7, cmd_buffer, 0) ||
396 !acsi_wait_for_IRQ(TIMEOUTDMA) ||
397 get_status())
398 goto bad;
399 ret = 0;
400bad:
401 return (ret);
402}
403
404/* testpkt() returns the number of received packets waiting in the queue */
405
406static int
407testpkt(int target)
408{
409 int ret = -1;
410
411 if (send_first(target, NUMPKTS))
412 goto bad;
413 ret = get_status();
414bad:
415 return (ret);
416}
417
418/* inquiry() returns 0 when PAM's DMA found, -1 when timeout, -2 otherwise */
419/* Please note: The buffer is for internal use only but must be defined! */
420
421static int
422inquiry (int target, unsigned char *buffer)
423{
424 int ret = -1;
425 unsigned char *vbuffer = phys_to_virt((unsigned long)buffer);
426 unsigned char cmd_buffer[5];
427
428 if (send_first(target, INQUIRY))
429 goto bad;
430 setup_dma(buffer, READ, 1);
431 vbuffer[8] = vbuffer[27] = 0; /* Avoid confusion with previous read data */
432 cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
433 cmd_buffer[3] = 48;
434 if (send_1_5(5, cmd_buffer, 1) ||
435 !acsi_wait_for_IRQ(TIMEOUTDMA) ||
436 get_status() ||
437 (calc_received(buffer) < 32))
438 goto bad;
439 dma_cache_maintenance((unsigned long)(buffer+8), 20, 0);
440 if (memcmp(inquire8, vbuffer+8, 20))
441 goto bad;
442 ret = 0;
443bad:
444 if (!!NET_DEBUG) {
445 vbuffer[8+20]=0;
446 printk("inquiry of target %d: %s\n", target, vbuffer+8);
447 }
448 return (ret);
449}
450
451/*
452 * read_hw_addr() reads the sector containing the hwaddr and returns
453 * a pointer to it (virtual address!) or 0 in case of an error
454 */
455
456static HADDR
457*read_hw_addr(int target, unsigned char *buffer)
458{
459 HADDR *ret = 0;
460 unsigned char cmd_buffer[5];
461
462 if (send_first(target, READSECTOR))
463 goto bad;
464 setup_dma(buffer, READ, 1);
465 cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
466 cmd_buffer[3] = 1;
467 if (send_1_5(5, cmd_buffer, 1) ||
468 !acsi_wait_for_IRQ(TIMEOUTDMA) ||
469 get_status())
470 goto bad;
471 ret = phys_to_virt((unsigned long)&(((DMAHWADDR *)buffer)->hwaddr));
472 dma_cache_maintenance((unsigned long)buffer, 512, 0);
473bad:
474 return (ret);
475}
476
477static irqreturn_t
478pamsnet_intr(int irq, void *data)
479{
480 return IRQ_HANDLED;
481}
482
483/* receivepkt() loads a packet to a given buffer and returns its length */
484
485static int
486receivepkt (int target, unsigned char *buffer)
487{
488 int ret = -1;
489 unsigned char cmd_buffer[5];
490
491 if (send_first(target, READPKT))
492 goto bad;
493 setup_dma(buffer, READ, 3);
494 cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
495 cmd_buffer[3] = 3;
496 if (send_1_5(7, cmd_buffer, 1) ||
497 !acsi_wait_for_IRQ(TIMEOUTDMA) ||
498 get_status())
499 goto bad;
500 ret = calc_received(buffer);
501bad:
502 return (ret);
503}
504
505/* sendpkt() sends a packet and returns a value of zero when the packet was sent
506 successfully */
507
508static int
509sendpkt (int target, unsigned char *buffer, int length)
510{
511 int ret = -1;
512 unsigned char cmd_buffer[5];
513
514 if (send_first(target, WRITEPKT))
515 goto bad;
516 setup_dma(buffer, WRITE, 3);
517 cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[4] = 0;
518 cmd_buffer[2] = length >> 8;
519 cmd_buffer[3] = length & 0xFF;
520 if (send_1_5(7, cmd_buffer, 1) ||
521 !acsi_wait_for_IRQ(TIMEOUTDMA) ||
522 get_status())
523 goto bad;
524 ret = 0;
525bad:
526 return (ret);
527}
528
529/* The following higher level routines work on virtual addresses and convert them to
530 * physical addresses when passed to the lowlevel routines. It's up to the higher level
531 * routines to copy data from Alternate RAM to ST RAM if neccesary!
532 */
533
534/* Check for a network adaptor of this type, and return '0' if one exists.
535 */
536
537struct net_device * __init pamsnet_probe (int unit)
538{
539 struct net_device *dev;
540 int i;
541 HADDR *hwaddr;
542 int err;
543
544 unsigned char station_addr[6];
545 static unsigned version_printed;
546 /* avoid "Probing for..." printed 4 times - the driver is supporting only one adapter now! */
547 static int no_more_found;
548
549 if (no_more_found)
550 return ERR_PTR(-ENODEV);
551 no_more_found = 1;
552
553 dev = alloc_etherdev(sizeof(struct net_local));
554 if (!dev)
555 return ERR_PTR(-ENOMEM);
556 if (unit >= 0) {
557 sprintf(dev->name, "eth%d", unit);
558 netdev_boot_setup_check(dev);
559 }
560 SET_MODULE_OWNER(dev);
561
562 printk("Probing for PAM's Net/GK Adapter...\n");
563
564 /* Allocate the DMA buffer here since we need it for probing! */
565
566 nic_packet = (struct nic_pkt_s *)acsi_buffer;
567 phys_nic_packet = (unsigned char *)phys_acsi_buffer;
568 if (pamsnet_debug > 0) {
569 printk("nic_packet at 0x%p, phys at 0x%p\n",
570 nic_packet, phys_nic_packet );
571 }
572
573 stdma_lock(pamsnet_intr, NULL);
574 DISABLE_IRQ();
575
576 for (i=0; i<8; i++) {
577 /* Do two inquiries to cover cases with strange equipment on previous ID */
578 /* blocking the ACSI bus (like the SLMC804 laser printer controller... */
579 inquiry(i, phys_nic_packet);
580 if (!inquiry(i, phys_nic_packet)) {
581 lance_target = i;
582 break;
583 }
584 }
585
586 if (!!NET_DEBUG)
587 printk("ID: %d\n",i);
588
589 if (lance_target >= 0) {
590 if (!(hwaddr = read_hw_addr(lance_target, phys_nic_packet)))
591 lance_target = -1;
592 else
593 memcpy (station_addr, hwaddr, ETH_ALEN);
594 }
595
596 ENABLE_IRQ();
597 stdma_release();
598
599 if (lance_target < 0) {
600 printk("No PAM's Net/GK found.\n");
601 free_netdev(dev);
602 return ERR_PTR(-ENODEV);
603 }
604
605 if (pamsnet_debug > 0 && version_printed++ == 0)
606 printk(version);
607
608 printk("%s: %s found on target %01d, eth-addr: %02x:%02x:%02x:%02x:%02x:%02x.\n",
609 dev->name, "PAM's Net/GK", lance_target,
610 station_addr[0], station_addr[1], station_addr[2],
611 station_addr[3], station_addr[4], station_addr[5]);
612
613 /* Initialize the device structure. */
614 dev->open = pamsnet_open;
615 dev->stop = pamsnet_close;
616 dev->hard_start_xmit = pamsnet_send_packet;
617 dev->get_stats = net_get_stats;
618
619 /* Fill in the fields of the device structure with ethernet-generic
620 * values. This should be in a common file instead of per-driver.
621 */
622
623 for (i = 0; i < ETH_ALEN; i++) {
624#if 0
625 dev->broadcast[i] = 0xff;
626#endif
627 dev->dev_addr[i] = station_addr[i];
628 }
629 err = register_netdev(dev);
630 if (!err)
631 return dev;
632
633 free_netdev(dev);
634 return ERR_PTR(err);
635}
636
637/* Open/initialize the board. This is called (in the current kernel)
638 sometime after booting when the 'ifconfig' program is run.
639
640 This routine should set everything up anew at each open, even
641 registers that "should" only need to be set once at boot, so that
642 there is non-reboot way to recover if something goes wrong.
643 */
644static int
645pamsnet_open(struct net_device *dev)
646{
647 struct net_local *lp = netdev_priv(dev);
648
649 if (pamsnet_debug > 0)
650 printk("pamsnet_open\n");
651 stdma_lock(pamsnet_intr, NULL);
652 DISABLE_IRQ();
653
654 /* Reset the hardware here.
655 */
656 if (!if_up)
657 start(lance_target);
658 if_up = 1;
659 lp->open_time = 0; /*jiffies*/
660 lp->poll_time = MAX_POLL_TIME;
661
662 dev->tbusy = 0;
663 dev->interrupt = 0;
664 dev->start = 1;
665
666 ENABLE_IRQ();
667 stdma_release();
668 pamsnet_timer.data = (long)dev;
669 pamsnet_timer.expires = jiffies + lp->poll_time;
670 add_timer(&pamsnet_timer);
671 return 0;
672}
673
674static int
675pamsnet_send_packet(struct sk_buff *skb, struct net_device *dev)
676{
677 struct net_local *lp = netdev_priv(dev);
678 unsigned long flags;
679
680 /* Block a timer-based transmit from overlapping. This could better be
681 * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
682 */
683 local_irq_save(flags);
684
685 if (stdma_islocked()) {
686 local_irq_restore(flags);
687 lp->stats.tx_errors++;
688 }
689 else {
690 int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
691 unsigned long buf = virt_to_phys(skb->data);
692 int stat;
693
694 stdma_lock(pamsnet_intr, NULL);
695 DISABLE_IRQ();
696
697 local_irq_restore(flags);
698 if( !STRAM_ADDR(buf+length-1) ) {
699 skb_copy_from_linear_data(skb, nic_packet->buffer,
700 length);
701 buf = (unsigned long)phys_nic_packet;
702 }
703
704 dma_cache_maintenance(buf, length, 1);
705
706 stat = sendpkt(lance_target, (unsigned char *)buf, length);
707 ENABLE_IRQ();
708 stdma_release();
709
710 dev->trans_start = jiffies;
711 dev->tbusy = 0;
712 lp->stats.tx_packets++;
713 lp->stats.tx_bytes+=length;
714 }
715 dev_kfree_skb(skb);
716
717 return 0;
718}
719
720/* We have a good packet(s), get it/them out of the buffers.
721 */
722static void
723pamsnet_poll_rx(struct net_device *dev)
724{
725 struct net_local *lp = netdev_priv(dev);
726 int boguscount;
727 int pkt_len;
728 struct sk_buff *skb;
729 unsigned long flags;
730
731 local_irq_save(flags);
732 /* ++roman: Take care at locking the ST-DMA... This must be done with ints
733 * off, since otherwise an int could slip in between the question and the
734 * locking itself, and then we'd go to sleep... And locking itself is
735 * necessary to keep the floppy_change timer from working with ST-DMA
736 * registers. */
737 if (stdma_islocked()) {
738 local_irq_restore(flags);
739 return;
740 }
741 stdma_lock(pamsnet_intr, NULL);
742 DISABLE_IRQ();
743 local_irq_restore(flags);
744
745 boguscount = testpkt(lance_target);
746 if( lp->poll_time < MAX_POLL_TIME ) lp->poll_time++;
747
748 while(boguscount--) {
749 pkt_len = receivepkt(lance_target, phys_nic_packet);
750
751 if( pkt_len < 60 ) break;
752
753 /* Good packet... */
754
755 dma_cache_maintenance((unsigned long)phys_nic_packet, pkt_len, 0);
756
757 lp->poll_time = pamsnet_min_poll_time; /* fast poll */
758 if( pkt_len >= 60 && pkt_len <= 2048 ) {
759 if (pkt_len > 1514)
760 pkt_len = 1514;
761
762 /* Malloc up new buffer.
763 */
764 skb = alloc_skb(pkt_len, GFP_ATOMIC);
765 if (skb == NULL) {
766 printk("%s: Memory squeeze, dropping packet.\n",
767 dev->name);
768 lp->stats.rx_dropped++;
769 break;
770 }
771 skb->len = pkt_len;
772 skb->dev = dev;
773
774 /* 'skb->data' points to the start of sk_buff data area.
775 */
776 skb_copy_to_linear_data(skb, nic_packet->buffer,
777 pkt_len);
778 netif_rx(skb);
779 dev->last_rx = jiffies;
780 lp->stats.rx_packets++;
781 lp->stats.rx_bytes+=pkt_len;
782 }
783 }
784
785 /* If any worth-while packets have been received, dev_rint()
786 has done a mark_bh(INET_BH) for us and will work on them
787 when we get to the bottom-half routine.
788 */
789
790 ENABLE_IRQ();
791 stdma_release();
792 return;
793}
794
795/* pamsnet_tick: called by pamsnet_timer. Reads packets from the adapter,
796 * passes them to the higher layers and restarts the timer.
797 */
798static void
799pamsnet_tick(unsigned long data)
800{
801 struct net_device *dev = (struct net_device *)data;
802 struct net_local *lp = netdev_priv(dev);
803
804 if( pamsnet_debug > 0 && (lp->open_time++ & 7) == 8 )
805 printk("pamsnet_tick: %ld\n", lp->open_time);
806
807 pamsnet_poll_rx(dev);
808
809 pamsnet_timer.expires = jiffies + lp->poll_time;
810 add_timer(&pamsnet_timer);
811}
812
813/* The inverse routine to pamsnet_open().
814 */
815static int
816pamsnet_close(struct net_device *dev)
817{
818 struct net_local *lp = netdev_priv(dev);
819
820 if (pamsnet_debug > 0)
821 printk("pamsnet_close, open_time=%ld\n", lp->open_time);
822 del_timer(&pamsnet_timer);
823 stdma_lock(pamsnet_intr, NULL);
824 DISABLE_IRQ();
825
826 if (if_up)
827 stop(lance_target);
828 if_up = 0;
829
830 lp->open_time = 0;
831
832 dev->tbusy = 1;
833 dev->start = 0;
834
835 ENABLE_IRQ();
836 stdma_release();
837 return 0;
838}
839
840/* Get the current statistics.
841 This may be called with the card open or closed.
842 */
843static struct net_device_stats *net_get_stats(struct net_device *dev)
844{
845 struct net_local *lp = netdev_priv(dev);
846 return &lp->stats;
847}
848
849
850#ifdef MODULE
851
852static struct net_device *pam_dev;
853
854int init_module(void)
855{
856 pam_dev = pamsnet_probe(-1);
857 if (IS_ERR(pam_dev))
858 return PTR_ERR(pam_dev);
859 return 0;
860}
861
862void cleanup_module(void)
863{
864 unregister_netdev(pam_dev);
865 free_netdev(pam_dev);
866}
867
868#endif /* MODULE */
869
870/* Local variables:
871 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include
872 -b m68k-linuxaout -Wall -Wstrict-prototypes -O2
873 -fomit-frame-pointer -pipe -DMODULE -I../../net/inet -c atari_pamsnet.c"
874 * version-control: t
875 * kept-new-versions: 5
876 * tab-width: 8
877 * End:
878 */
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