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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SDL Inc. RISCom/N2 synchronous serial card driver for Linux
4 *
5 * Copyright (C) 1998-2003 Krzysztof Halasa <[email protected]>
6 *
7 * For information see <https://www.kernel.org/pub/linux/utils/net/hdlc/>
8 *
9 * Note: integrated CSU/DSU/DDS are not supported by this driver
10 *
11 * Sources of information:
12 * Hitachi HD64570 SCA User's Manual
13 * SDL Inc. PPP/HDLC/CISCO driver
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/capability.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/moduleparam.h>
30#include <linux/netdevice.h>
31#include <linux/hdlc.h>
32#include <asm/io.h>
33#include "hd64570.h"
34
35static const char *version = "SDL RISCom/N2 driver version: 1.15";
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 /* 9.8304 MHz */
44#define MAX_PAGES 16 /* 16 RAM pages at max */
45#define MAX_RAM_SIZE 0x80000 /* 512 KB */
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 NEED_SCA_MSCI_INTR
53#define MAX_TX_BUFFERS 10
54
55static char *hw; /* pointer to hw=xxx command line string */
56
57/* RISCom/N2 Board Registers */
58
59/* PC Control Register */
60#define N2_PCR 0
61#define PCR_RUNSCA 1 /* Run 64570 */
62#define PCR_VPM 2 /* Enable VPM - needed if using RAM above 1 MB */
63#define PCR_ENWIN 4 /* Open window */
64#define PCR_BUS16 8 /* 16-bit bus */
65
66/* Memory Base Address Register */
67#define N2_BAR 2
68
69/* Page Scan Register */
70#define N2_PSR 4
71#define WIN16K 0x00
72#define WIN32K 0x20
73#define WIN64K 0x40
74#define PSR_WINBITS 0x60
75#define PSR_DMAEN 0x80
76#define PSR_PAGEBITS 0x0F
77
78/* Modem Control Reg */
79#define N2_MCR 6
80#define CLOCK_OUT_PORT1 0x80
81#define CLOCK_OUT_PORT0 0x40
82#define TX422_PORT1 0x20
83#define TX422_PORT0 0x10
84#define DSR_PORT1 0x08
85#define DSR_PORT0 0x04
86#define DTR_PORT1 0x02
87#define DTR_PORT0 0x01
88
89typedef struct port_s {
90 struct net_device *dev;
91 struct card_s *card;
92 spinlock_t lock; /* TX lock */
93 sync_serial_settings settings;
94 int valid; /* port enabled */
95 int rxpart; /* partial frame received, next frame invalid*/
96 unsigned short encoding;
97 unsigned short parity;
98 u16 rxin; /* rx ring buffer 'in' pointer */
99 u16 txin; /* tx ring buffer 'in' and 'last' pointers */
100 u16 txlast;
101 u8 rxs, txs, tmc; /* SCA registers */
102 u8 phy_node; /* physical port # - 0 or 1 */
103 u8 log_node; /* logical port # */
104} port_t;
105
106typedef struct card_s {
107 u8 __iomem *winbase; /* ISA window base address */
108 u32 phy_winbase; /* ISA physical base address */
109 u32 ram_size; /* number of bytes */
110 u16 io; /* IO Base address */
111 u16 buff_offset; /* offset of first buffer of first channel */
112 u16 rx_ring_buffers; /* number of buffers in a ring */
113 u16 tx_ring_buffers;
114 u8 irq; /* IRQ (3-15) */
115
116 port_t ports[2];
117 struct card_s *next_card;
118} card_t;
119
120static card_t *first_card;
121static card_t **new_card = &first_card;
122
123#define sca_reg(reg, card) (0x8000 | (card)->io | \
124 ((reg) & 0x0F) | (((reg) & 0xF0) << 6))
125#define sca_in(reg, card) inb(sca_reg(reg, card))
126#define sca_out(value, reg, card) outb(value, sca_reg(reg, card))
127#define sca_inw(reg, card) inw(sca_reg(reg, card))
128#define sca_outw(value, reg, card) outw(value, sca_reg(reg, card))
129
130#define port_to_card(port) ((port)->card)
131#define log_node(port) ((port)->log_node)
132#define phy_node(port) ((port)->phy_node)
133#define winsize(card) (USE_WINDOWSIZE)
134#define winbase(card) ((card)->winbase)
135#define get_port(card, port) ((card)->ports[port].valid ? \
136 &(card)->ports[port] : NULL)
137
138static __inline__ u8 sca_get_page(card_t *card)
139{
140 return inb(card->io + N2_PSR) & PSR_PAGEBITS;
141}
142
143static __inline__ void openwin(card_t *card, u8 page)
144{
145 u8 psr = inb(card->io + N2_PSR);
146
147 outb((psr & ~PSR_PAGEBITS) | page, card->io + N2_PSR);
148}
149
150#include "hd64570.c"
151
152static void n2_set_iface(port_t *port)
153{
154 card_t *card = port->card;
155 int io = card->io;
156 u8 mcr = inb(io + N2_MCR);
157 u8 msci = get_msci(port);
158 u8 rxs = port->rxs & CLK_BRG_MASK;
159 u8 txs = port->txs & CLK_BRG_MASK;
160
161 switch (port->settings.clock_type) {
162 case CLOCK_INT:
163 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
164 rxs |= CLK_BRG_RX; /* BRG output */
165 txs |= CLK_RXCLK_TX; /* RX clock */
166 break;
167
168 case CLOCK_TXINT:
169 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
170 rxs |= CLK_LINE_RX; /* RXC input */
171 txs |= CLK_BRG_TX; /* BRG output */
172 break;
173
174 case CLOCK_TXFROMRX:
175 mcr |= port->phy_node ? CLOCK_OUT_PORT1 : CLOCK_OUT_PORT0;
176 rxs |= CLK_LINE_RX; /* RXC input */
177 txs |= CLK_RXCLK_TX; /* RX clock */
178 break;
179
180 default: /* Clock EXTernal */
181 mcr &= port->phy_node ? ~CLOCK_OUT_PORT1 : ~CLOCK_OUT_PORT0;
182 rxs |= CLK_LINE_RX; /* RXC input */
183 txs |= CLK_LINE_TX; /* TXC input */
184 }
185
186 outb(mcr, io + N2_MCR);
187 port->rxs = rxs;
188 port->txs = txs;
189 sca_out(rxs, msci + RXS, card);
190 sca_out(txs, msci + TXS, card);
191 sca_set_port(port);
192}
193
194static int n2_open(struct net_device *dev)
195{
196 port_t *port = dev_to_port(dev);
197 int io = port->card->io;
198 u8 mcr = inb(io + N2_MCR) |
199 (port->phy_node ? TX422_PORT1 : TX422_PORT0);
200 int result;
201
202 result = hdlc_open(dev);
203 if (result)
204 return result;
205
206 mcr &= port->phy_node ? ~DTR_PORT1 : ~DTR_PORT0; /* set DTR ON */
207 outb(mcr, io + N2_MCR);
208
209 outb(inb(io + N2_PCR) | PCR_ENWIN, io + N2_PCR); /* open window */
210 outb(inb(io + N2_PSR) | PSR_DMAEN, io + N2_PSR); /* enable dma */
211 sca_open(dev);
212 n2_set_iface(port);
213 return 0;
214}
215
216static int n2_close(struct net_device *dev)
217{
218 port_t *port = dev_to_port(dev);
219 int io = port->card->io;
220 u8 mcr = inb(io + N2_MCR) |
221 (port->phy_node ? TX422_PORT1 : TX422_PORT0);
222
223 sca_close(dev);
224 mcr |= port->phy_node ? DTR_PORT1 : DTR_PORT0; /* set DTR OFF */
225 outb(mcr, io + N2_MCR);
226 hdlc_close(dev);
227 return 0;
228}
229
230static int n2_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
231 void __user *data, int cmd)
232{
233#ifdef DEBUG_RINGS
234 if (cmd == SIOCDEVPRIVATE) {
235 sca_dump_rings(dev);
236 return 0;
237 }
238#endif
239 return -EOPNOTSUPP;
240}
241
242static int n2_ioctl(struct net_device *dev, struct if_settings *ifs)
243{
244 const size_t size = sizeof(sync_serial_settings);
245 sync_serial_settings new_line;
246 sync_serial_settings __user *line = ifs->ifs_ifsu.sync;
247 port_t *port = dev_to_port(dev);
248
249 switch (ifs->type) {
250 case IF_GET_IFACE:
251 ifs->type = IF_IFACE_SYNC_SERIAL;
252 if (ifs->size < size) {
253 ifs->size = size; /* data size wanted */
254 return -ENOBUFS;
255 }
256 if (copy_to_user(line, &port->settings, size))
257 return -EFAULT;
258 return 0;
259
260 case IF_IFACE_SYNC_SERIAL:
261 if (!capable(CAP_NET_ADMIN))
262 return -EPERM;
263
264 if (copy_from_user(&new_line, line, size))
265 return -EFAULT;
266
267 if (new_line.clock_type != CLOCK_EXT &&
268 new_line.clock_type != CLOCK_TXFROMRX &&
269 new_line.clock_type != CLOCK_INT &&
270 new_line.clock_type != CLOCK_TXINT)
271 return -EINVAL; /* No such clock setting */
272
273 if (new_line.loopback != 0 && new_line.loopback != 1)
274 return -EINVAL;
275
276 memcpy(&port->settings, &new_line, size); /* Update settings */
277 n2_set_iface(port);
278 return 0;
279
280 default:
281 return hdlc_ioctl(dev, ifs);
282 }
283}
284
285static void n2_destroy_card(card_t *card)
286{
287 int cnt;
288
289 for (cnt = 0; cnt < 2; cnt++)
290 if (card->ports[cnt].card) {
291 struct net_device *dev = port_to_dev(&card->ports[cnt]);
292
293 unregister_hdlc_device(dev);
294 }
295
296 if (card->irq)
297 free_irq(card->irq, card);
298
299 if (card->winbase) {
300 iounmap(card->winbase);
301 release_mem_region(card->phy_winbase, USE_WINDOWSIZE);
302 }
303
304 if (card->io)
305 release_region(card->io, N2_IOPORTS);
306 if (card->ports[0].dev)
307 free_netdev(card->ports[0].dev);
308 if (card->ports[1].dev)
309 free_netdev(card->ports[1].dev);
310 kfree(card);
311}
312
313static const struct net_device_ops n2_ops = {
314 .ndo_open = n2_open,
315 .ndo_stop = n2_close,
316 .ndo_start_xmit = hdlc_start_xmit,
317 .ndo_siocwandev = n2_ioctl,
318 .ndo_siocdevprivate = n2_siocdevprivate,
319};
320
321static int __init n2_run(unsigned long io, unsigned long irq,
322 unsigned long winbase, long valid0, long valid1)
323{
324 card_t *card;
325 u8 cnt, pcr;
326 int i;
327
328 if (io < 0x200 || io > 0x3FF || (io % N2_IOPORTS) != 0) {
329 pr_err("invalid I/O port value\n");
330 return -ENODEV;
331 }
332
333 if (irq < 3 || irq > 15 || irq == 6) /* FIXME */ {
334 pr_err("invalid IRQ value\n");
335 return -ENODEV;
336 }
337
338 if (winbase < 0xA0000 || winbase > 0xFFFFF || (winbase & 0xFFF) != 0) {
339 pr_err("invalid RAM value\n");
340 return -ENODEV;
341 }
342
343 card = kzalloc_obj(card_t);
344 if (!card)
345 return -ENOBUFS;
346
347 card->ports[0].dev = alloc_hdlcdev(&card->ports[0]);
348 card->ports[1].dev = alloc_hdlcdev(&card->ports[1]);
349 if (!card->ports[0].dev || !card->ports[1].dev) {
350 pr_err("unable to allocate memory\n");
351 n2_destroy_card(card);
352 return -ENOMEM;
353 }
354
355 if (!request_region(io, N2_IOPORTS, devname)) {
356 pr_err("I/O port region in use\n");
357 n2_destroy_card(card);
358 return -EBUSY;
359 }
360 card->io = io;
361
362 if (request_irq(irq, sca_intr, 0, devname, card)) {
363 pr_err("could not allocate IRQ\n");
364 n2_destroy_card(card);
365 return -EBUSY;
366 }
367 card->irq = irq;
368
369 if (!request_mem_region(winbase, USE_WINDOWSIZE, devname)) {
370 pr_err("could not request RAM window\n");
371 n2_destroy_card(card);
372 return -EBUSY;
373 }
374 card->phy_winbase = winbase;
375 card->winbase = ioremap(winbase, USE_WINDOWSIZE);
376 if (!card->winbase) {
377 pr_err("ioremap() failed\n");
378 n2_destroy_card(card);
379 return -EFAULT;
380 }
381
382 outb(0, io + N2_PCR);
383 outb(winbase >> 12, io + N2_BAR);
384
385 switch (USE_WINDOWSIZE) {
386 case 16384:
387 outb(WIN16K, io + N2_PSR);
388 break;
389
390 case 32768:
391 outb(WIN32K, io + N2_PSR);
392 break;
393
394 case 65536:
395 outb(WIN64K, io + N2_PSR);
396 break;
397
398 default:
399 pr_err("invalid window size\n");
400 n2_destroy_card(card);
401 return -ENODEV;
402 }
403
404 pcr = PCR_ENWIN | PCR_VPM | (USE_BUS16BITS ? PCR_BUS16 : 0);
405 outb(pcr, io + N2_PCR);
406
407 card->ram_size = sca_detect_ram(card, card->winbase, MAX_RAM_SIZE);
408
409 /* number of TX + RX buffers for one port */
410 i = card->ram_size / ((valid0 + valid1) * (sizeof(pkt_desc) +
411 HDLC_MAX_MRU));
412
413 card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
414 card->rx_ring_buffers = i - card->tx_ring_buffers;
415
416 card->buff_offset = (valid0 + valid1) * sizeof(pkt_desc) *
417 (card->tx_ring_buffers + card->rx_ring_buffers);
418
419 pr_info("RISCom/N2 %u KB RAM, IRQ%u, using %u TX + %u RX packets rings\n",
420 card->ram_size / 1024, card->irq,
421 card->tx_ring_buffers, card->rx_ring_buffers);
422
423 if (card->tx_ring_buffers < 1) {
424 pr_err("RAM test failed\n");
425 n2_destroy_card(card);
426 return -EIO;
427 }
428
429 pcr |= PCR_RUNSCA; /* run SCA */
430 outb(pcr, io + N2_PCR);
431 outb(0, io + N2_MCR);
432
433 sca_init(card, 0);
434 for (cnt = 0; cnt < 2; cnt++) {
435 port_t *port = &card->ports[cnt];
436 struct net_device *dev = port_to_dev(port);
437 hdlc_device *hdlc = dev_to_hdlc(dev);
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->netdev_ops = &n2_ops;
454 hdlc->attach = sca_attach;
455 hdlc->xmit = sca_xmit;
456 port->settings.clock_type = CLOCK_EXT;
457 port->card = card;
458
459 if (register_hdlc_device(dev)) {
460 pr_warn("unable to register hdlc device\n");
461 port->card = NULL;
462 n2_destroy_card(card);
463 return -ENOBUFS;
464 }
465 sca_init_port(port); /* Set up SCA memory */
466
467 netdev_info(dev, "RISCom/N2 node %d\n", port->phy_node);
468 }
469
470 *new_card = card;
471 new_card = &card->next_card;
472
473 return 0;
474}
475
476static int __init n2_init(void)
477{
478 if (!hw) {
479#ifdef MODULE
480 pr_info("no card initialized\n");
481#endif
482 return -EINVAL; /* no parameters specified, abort */
483 }
484
485 pr_info("%s\n", version);
486
487 do {
488 unsigned long io, irq, ram;
489 long valid[2] = { 0, 0 }; /* Default = both ports disabled */
490
491 io = simple_strtoul(hw, &hw, 0);
492
493 if (*hw++ != ',')
494 break;
495 irq = simple_strtoul(hw, &hw, 0);
496
497 if (*hw++ != ',')
498 break;
499 ram = simple_strtoul(hw, &hw, 0);
500
501 if (*hw++ != ',')
502 break;
503 while (1) {
504 if (*hw == '0' && !valid[0])
505 valid[0] = 1; /* Port 0 enabled */
506 else if (*hw == '1' && !valid[1])
507 valid[1] = 1; /* Port 1 enabled */
508 else
509 break;
510 hw++;
511 }
512
513 if (!valid[0] && !valid[1])
514 break; /* at least one port must be used */
515
516 if (*hw == ':' || *hw == '\x0')
517 n2_run(io, irq, ram, valid[0], valid[1]);
518
519 if (*hw == '\x0')
520 return first_card ? 0 : -EINVAL;
521 } while (*hw++ == ':');
522
523 pr_err("invalid hardware parameters\n");
524 return first_card ? 0 : -EINVAL;
525}
526
527static void __exit n2_cleanup(void)
528{
529 card_t *card = first_card;
530
531 while (card) {
532 card_t *ptr = card;
533
534 card = card->next_card;
535 n2_destroy_card(ptr);
536 }
537}
538
539module_init(n2_init);
540module_exit(n2_cleanup);
541
542MODULE_AUTHOR("Krzysztof Halasa <[email protected]>");
543MODULE_DESCRIPTION("RISCom/N2 serial port driver");
544MODULE_LICENSE("GPL v2");
545module_param(hw, charp, 0444);
546MODULE_PARM_DESC(hw, "io,irq,ram,ports:io,irq,...");