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19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/types.h>
23#include <linux/fcntl.h>
24#include <linux/in.h>
25#include <linux/string.h>
26#include <linux/errno.h>
27#include <linux/init.h>
28#include <linux/ioport.h>
29#include <linux/netdevice.h>
30#include <linux/hdlc.h>
31#include <asm/io.h>
32#include "hd64570.h"
33
34
35static const char* version = "SDL RISCom/N2 driver version: 1.14";
36static const char* devname = "RISCom/N2";
37
38#undef DEBUG_PKT
39#define DEBUG_RINGS
40
41#define USE_WINDOWSIZE 16384
42#define USE_BUS16BITS 1
43#define CLOCK_BASE 9830400
44#define MAX_PAGES 16
45#define MAX_RAM_SIZE 0x80000
46#if MAX_RAM_SIZE > MAX_PAGES * USE_WINDOWSIZE
47#undef MAX_RAM_SIZE
48#define MAX_RAM_SIZE (MAX_PAGES * USE_WINDOWSIZE)
49#endif
50#define N2_IOPORTS 0x10
51#define NEED_DETECT_RAM
52#define MAX_TX_BUFFERS 10
53
54static char *hw = NULL;
55
56
57
58
59#define N2_PCR 0
60#define PCR_RUNSCA 1
61#define PCR_VPM 2
62#define PCR_ENWIN 4
63#define PCR_BUS16 8
64
65
66
67#define N2_BAR 2
68
69
70
71#define N2_PSR 4
72#define WIN16K 0x00
73#define WIN32K 0x20
74#define WIN64K 0x40
75#define PSR_WINBITS 0x60
76#define PSR_DMAEN 0x80
77#define PSR_PAGEBITS 0x0F
78
79
80
81#define N2_MCR 6
82#define CLOCK_OUT_PORT1 0x80
83#define CLOCK_OUT_PORT0 0x40
84#define TX422_PORT1 0x20
85#define TX422_PORT0 0x10
86#define DSR_PORT1 0x08
87#define DSR_PORT0 0x04
88#define DTR_PORT1 0x02
89#define DTR_PORT0 0x01
90
91
92typedef struct port_s {
93 hdlc_device hdlc;
94 struct card_s *card;
95 spinlock_t lock;
96 sync_serial_settings settings;
97 int valid;
98 int rxpart;
99 unsigned short encoding;
100 unsigned short parity;
101 u16 rxin;
102 u16 txin;
103 u16 txlast;
104 u8 rxs, txs, tmc;
105 u8 phy_node;
106 u8 log_node;
107}port_t;
108
109
110
111typedef struct card_s {
112 u8 *winbase;
113 u32 phy_winbase;
114 u32 ram_size;
115 u16 io;
116 u16 buff_offset;
117 u16 rx_ring_buffers;
118 u16 tx_ring_buffers;
119 u8 irq;
120
121 port_t ports[2];
122 struct card_s *next_card;
123}card_t;
124
125
126static card_t *first_card;
127static card_t **new_card = &first_card;
128
129
130#define sca_reg(reg, card) (0x8000 | (card)->io | \
131 ((reg) & 0x0F) | (((reg) & 0xF0) << 6))
132#define sca_in(reg, card) inb(sca_reg(reg, card))
133#define sca_out(value, reg, card) outb(value, sca_reg(reg, card))
134#define sca_inw(reg, card) inw(sca_reg(reg, card))
135#define sca_outw(value, reg, card) outw(value, sca_reg(reg, card))
136
137#define port_to_card(port) ((port)->card)
138#define log_node(port) ((port)->log_node)
139#define phy_node(port) ((port)->phy_node)
140#define winsize(card) (USE_WINDOWSIZE)
141#define winbase(card) ((card)->winbase)
142#define get_port(card, port) ((card)->ports[port].valid ? \
143 &(card)->ports[port] : NULL)
144
145
146
147static __inline__ u8 sca_get_page(card_t *card)
148{
149 return inb(card->io + N2_PSR) & PSR_PAGEBITS;
150}
151
152
153static __inline__ void openwin(card_t *card, u8 page)
154{
155 u8 psr = inb(card->io + N2_PSR);
156 outb((psr & ~PSR_PAGEBITS) | page, card->io + N2_PSR);
157}
158
159
160static __inline__ void close_windows(card_t *card)
161{
162 outb(inb(card->io + N2_PCR) & ~PCR_ENWIN, card->io + N2_PCR);
163}
164
165
166#include "hd6457x.c"
167
168
169
170static void n2_set_iface(port_t *port)
171{
172 card_t *card = port->card;
173 int io = card->io;
174 u8 mcr = inb(io + N2_MCR);
175 u8 msci = get_msci(port);
176 u8 rxs = port->rxs & CLK_BRG_MASK;
177 u8 txs = port->txs & CLK_BRG_MASK;
178
179 switch(port->settings.clock_type) {
180 case CLOCK_INT:
181 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
182 rxs |= CLK_BRG_RX;
183 txs |= CLK_RXCLK_TX;
184 break;
185
186 case CLOCK_TXINT:
187 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
188 rxs |= CLK_LINE_RX;
189 txs |= CLK_BRG_TX;
190 break;
191
192 case CLOCK_TXFROMRX:
193 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
194 rxs |= CLK_LINE_RX;
195 txs |= CLK_RXCLK_TX;
196 break;
197
198 default:
199 mcr &= port->phy_node ? ~CLOCK_OUT_PORT1 : ~CLOCK_OUT_PORT0;
200 rxs |= CLK_LINE_RX;
201 txs |= CLK_LINE_TX;
202 }
203
204 outb(mcr, io + N2_MCR);
205 port->rxs = rxs;
206 port->txs = txs;
207 sca_out(rxs, msci + RXS, card);
208 sca_out(txs, msci + TXS, card);
209 sca_set_port(port);
210}
211
212
213
214static int n2_open(struct net_device *dev)
215{
216 hdlc_device *hdlc = dev_to_hdlc(dev);
217 port_t *port = hdlc_to_port(hdlc);
218 int io = port->card->io;
219 u8 mcr = inb(io + N2_MCR) | (port->phy_node ? TX422_PORT1:TX422_PORT0);
220
221 int result = hdlc_open(hdlc);
222 if (result)
223 return result;
224
225 MOD_INC_USE_COUNT;
226 mcr &= port->phy_node ? ~DTR_PORT1 : ~DTR_PORT0;
227 outb(mcr, io + N2_MCR);
228
229 outb(inb(io + N2_PCR) | PCR_ENWIN, io + N2_PCR);
230 outb(inb(io + N2_PSR) | PSR_DMAEN, io + N2_PSR);
231 sca_open(hdlc);
232 n2_set_iface(port);
233 return 0;
234}
235
236
237
238static int n2_close(struct net_device *dev)
239{
240 hdlc_device *hdlc = dev_to_hdlc(dev);
241 port_t *port = hdlc_to_port(hdlc);
242 int io = port->card->io;
243 u8 mcr = inb(io+N2_MCR) | (port->phy_node ? TX422_PORT1 : TX422_PORT0);
244
245 sca_close(hdlc);
246 mcr |= port->phy_node ? DTR_PORT1 : DTR_PORT0;
247 outb(mcr, io + N2_MCR);
248 hdlc_close(hdlc);
249 MOD_DEC_USE_COUNT;
250 return 0;
251}
252
253
254
255static int n2_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
256{
257 const size_t size = sizeof(sync_serial_settings);
258 sync_serial_settings new_line, *line = ifr->ifr_settings.ifs_ifsu.sync;
259 hdlc_device *hdlc = dev_to_hdlc(dev);
260 port_t *port = hdlc_to_port(hdlc);
261
262#ifdef DEBUG_RINGS
263 if (cmd == SIOCDEVPRIVATE) {
264 sca_dump_rings(hdlc);
265 return 0;
266 }
267#endif
268 if (cmd != SIOCWANDEV)
269 return hdlc_ioctl(dev, ifr, cmd);
270
271 switch(ifr->ifr_settings.type) {
272 case IF_GET_IFACE:
273 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
274 if (ifr->ifr_settings.size < size) {
275 ifr->ifr_settings.size = size;
276 return -ENOBUFS;
277 }
278 if (copy_to_user(line, &port->settings, size))
279 return -EFAULT;
280 return 0;
281
282 case IF_IFACE_SYNC_SERIAL:
283 if(!capable(CAP_NET_ADMIN))
284 return -EPERM;
285
286 if (copy_from_user(&new_line, line, size))
287 return -EFAULT;
288
289 if (new_line.clock_type != CLOCK_EXT &&
290 new_line.clock_type != CLOCK_TXFROMRX &&
291 new_line.clock_type != CLOCK_INT &&
292 new_line.clock_type != CLOCK_TXINT)
293 return -EINVAL;
294
295 if (new_line.loopback != 0 && new_line.loopback != 1)
296 return -EINVAL;
297
298 memcpy(&port->settings, &new_line, size);
299 n2_set_iface(port);
300 return 0;
301
302 default:
303 return hdlc_ioctl(dev, ifr, cmd);
304 }
305}
306
307
308
309static void n2_destroy_card(card_t *card)
310{
311 int cnt;
312
313 for (cnt = 0; cnt < 2; cnt++)
314 if (card->ports[cnt].card)
315 unregister_hdlc_device(&card->ports[cnt].hdlc);
316
317 if (card->irq)
318 free_irq(card->irq, card);
319
320 if (card->winbase) {
321 iounmap(card->winbase);
322 release_mem_region(card->phy_winbase, USE_WINDOWSIZE);
323 }
324
325 if (card->io)
326 release_region(card->io, N2_IOPORTS);
327 kfree(card);
328}
329
330
331
332static int __init n2_run(unsigned long io, unsigned long irq,
333 unsigned long winbase, long valid0, long valid1)
334{
335 card_t *card;
336 u8 cnt, pcr;
337 int i;
338
339 if (io < 0x200 || io > 0x3FF || (io % N2_IOPORTS) != 0) {
340 printk(KERN_ERR "n2: invalid I/O port value\n");
341 return -ENODEV;
342 }
343
344 if (irq < 3 || irq > 15 || irq == 6) {
345 printk(KERN_ERR "n2: invalid IRQ value\n");
346 return -ENODEV;
347 }
348
349 if (winbase < 0xA0000 || winbase > 0xFFFFF || (winbase & 0xFFF) != 0) {
350 printk(KERN_ERR "n2: invalid RAM value\n");
351 return -ENODEV;
352 }
353
354 card = kmalloc(sizeof(card_t), GFP_KERNEL);
355 if (card == NULL) {
356 printk(KERN_ERR "n2: unable to allocate memory\n");
357 return -ENOBUFS;
358 }
359 memset(card, 0, sizeof(card_t));
360
361 if (!request_region(io, N2_IOPORTS, devname)) {
362 printk(KERN_ERR "n2: I/O port region in use\n");
363 n2_destroy_card(card);
364 return -EBUSY;
365 }
366 card->io = io;
367
368 if (request_irq(irq, &sca_intr, 0, devname, card)) {
369 printk(KERN_ERR "n2: could not allocate IRQ\n");
370 n2_destroy_card(card);
371 return(-EBUSY);
372 }
373 card->irq = irq;
374
375 if (!request_mem_region(winbase, USE_WINDOWSIZE, devname)) {
376 printk(KERN_ERR "n2: could not request RAM window\n");
377 n2_destroy_card(card);
378 return(-EBUSY);
379 }
380 card->phy_winbase = winbase;
381 card->winbase = ioremap(winbase, USE_WINDOWSIZE);
382
383 outb(0, io + N2_PCR);
384 outb(winbase >> 12, io + N2_BAR);
385
386 switch (USE_WINDOWSIZE) {
387 case 16384:
388 outb(WIN16K, io + N2_PSR);
389 break;
390
391 case 32768:
392 outb(WIN32K, io + N2_PSR);
393 break;
394
395 case 65536:
396 outb(WIN64K, io + N2_PSR);
397 break;
398
399 default:
400 printk(KERN_ERR "n2: invalid window size\n");
401 n2_destroy_card(card);
402 return -ENODEV;
403 }
404
405 pcr = PCR_ENWIN | PCR_VPM | (USE_BUS16BITS ? PCR_BUS16 : 0);
406 outb(pcr, io + N2_PCR);
407
408 card->ram_size = sca_detect_ram(card, card->winbase, MAX_RAM_SIZE);
409
410
411 i = card->ram_size / ((valid0 + valid1) * (sizeof(pkt_desc) +
412 HDLC_MAX_MRU));
413
414 card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
415 card->rx_ring_buffers = i - card->tx_ring_buffers;
416
417 card->buff_offset = (valid0 + valid1) * sizeof(pkt_desc) *
418 (card->tx_ring_buffers + card->rx_ring_buffers);
419
420 printk(KERN_INFO "n2: RISCom/N2 %u KB RAM, IRQ%u, "
421 "using %u TX + %u RX packets rings\n", card->ram_size / 1024,
422 card->irq, card->tx_ring_buffers, card->rx_ring_buffers);
423
424 if (card->tx_ring_buffers < 1) {
425 printk(KERN_ERR "n2: RAM test failed\n");
426 n2_destroy_card(card);
427 return -EIO;
428 }
429
430 pcr |= PCR_RUNSCA;
431 outb(pcr, io + N2_PCR);
432 outb(0, io + N2_MCR);
433
434 sca_init(card, 0);
435 for (cnt = 0; cnt < 2; cnt++) {
436 port_t *port = &card->ports[cnt];
437 struct net_device *dev = hdlc_to_dev(&port->hdlc);
438
439 if ((cnt == 0 && !valid0) || (cnt == 1 && !valid1))
440 continue;
441
442 port->phy_node = cnt;
443 port->valid = 1;
444
445 if ((cnt == 1) && valid0)
446 port->log_node = 1;
447
448 spin_lock_init(&port->lock);
449 dev->irq = irq;
450 dev->mem_start = winbase;
451 dev->mem_end = winbase + USE_WINDOWSIZE - 1;
452 dev->tx_queue_len = 50;
453 dev->do_ioctl = n2_ioctl;
454 dev->open = n2_open;
455 dev->stop = n2_close;
456 port->hdlc.attach = sca_attach;
457 port->hdlc.xmit = sca_xmit;
458 port->settings.clock_type = CLOCK_EXT;
459
460 if (register_hdlc_device(&port->hdlc)) {
461 printk(KERN_WARNING "n2: unable to register hdlc "
462 "device\n");
463 n2_destroy_card(card);
464 return -ENOBUFS;
465 }
466 port->card = card;
467 sca_init_sync_port(port);
468
469 printk(KERN_INFO "%s: RISCom/N2 node %d\n",
470 hdlc_to_name(&port->hdlc), port->phy_node);
471 }
472
473 *new_card = card;
474 new_card = &card->next_card;
475
476 return 0;
477}
478
479
480
481static int __init n2_init(void)
482{
483 if (hw==NULL) {
484#ifdef MODULE
485 printk(KERN_INFO "n2: no card initialized\n");
486#endif
487 return -ENOSYS;
488 }
489
490 printk(KERN_INFO "%s\n", version);
491
492 do {
493 unsigned long io, irq, ram;
494 long valid[2] = { 0, 0 };
495
496 io = simple_strtoul(hw, &hw, 0);
497
498 if (*hw++ != ',')
499 break;
500 irq = simple_strtoul(hw, &hw, 0);
501
502 if (*hw++ != ',')
503 break;
504 ram = simple_strtoul(hw, &hw, 0);
505
506 if (*hw++ != ',')
507 break;
508 while(1) {
509 if (*hw == '0' && !valid[0])
510 valid[0] = 1;
511 else if (*hw == '1' && !valid[1])
512 valid[1] = 1;
513 else
514 break;
515 hw++;
516 }
517
518 if (!valid[0] && !valid[1])
519 break;
520
521 if (*hw == ':' || *hw == '\x0')
522 n2_run(io, irq, ram, valid[0], valid[1]);
523
524 if (*hw == '\x0')
525 return first_card ? 0 : -ENOSYS;
526 }while(*hw++ == ':');
527
528 printk(KERN_ERR "n2: invalid hardware parameters\n");
529 return first_card ? 0 : -ENOSYS;
530}
531
532
533#ifndef MODULE
534static int __init n2_setup(char *str)
535{
536 hw = str;
537 return 1;
538}
539
540__setup("n2=", n2_setup);
541#endif
542
543
544static void __exit n2_cleanup(void)
545{
546 card_t *card = first_card;
547
548 while (card) {
549 card_t *ptr = card;
550 card = card->next_card;
551 n2_destroy_card(ptr);
552 }
553}
554
555
556module_init(n2_init);
557module_exit(n2_cleanup);
558
559MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
560MODULE_DESCRIPTION("RISCom/N2 serial port driver");
561MODULE_LICENSE("GPL v2");
562MODULE_PARM(hw, "s");
563EXPORT_NO_SYMBOLS;
564
