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1da177e4 LT |
1 | /* |
2 | * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers) | |
3 | * | |
4 | * Written 1997 by David Woodhouse. | |
5 | * Written 1994-1999 by Avery Pennarun. | |
6 | * Written 1999-2000 by Martin Mares <mj@ucw.cz>. | |
7 | * Derived from skeleton.c by Donald Becker. | |
8 | * | |
9 | * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) | |
10 | * for sponsoring the further development of this driver. | |
11 | * | |
12 | * ********************** | |
13 | * | |
14 | * The original copyright of skeleton.c was as follows: | |
15 | * | |
16 | * skeleton.c Written 1993 by Donald Becker. | |
17 | * Copyright 1993 United States Government as represented by the | |
18 | * Director, National Security Agency. This software may only be used | |
19 | * and distributed according to the terms of the GNU General Public License as | |
20 | * modified by SRC, incorporated herein by reference. | |
21 | * | |
22 | * ********************** | |
23 | * | |
24 | * For more details, see drivers/net/arcnet.c | |
25 | * | |
26 | * ********************** | |
27 | */ | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/moduleparam.h> | |
31 | #include <linux/ioport.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/bootmem.h> | |
36 | #include <linux/init.h> | |
37 | #include <asm/io.h> | |
38 | #include <linux/arcdevice.h> | |
39 | ||
40 | ||
41 | #define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n" | |
42 | ||
43 | ||
44 | /* Internal function declarations */ | |
45 | ||
46 | static int com90io_found(struct net_device *dev); | |
47 | static void com90io_command(struct net_device *dev, int command); | |
48 | static int com90io_status(struct net_device *dev); | |
49 | static void com90io_setmask(struct net_device *dev, int mask); | |
50 | static int com90io_reset(struct net_device *dev, int really_reset); | |
51 | static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset, | |
52 | void *buf, int count); | |
53 | static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset, | |
54 | void *buf, int count); | |
55 | ||
56 | ||
57 | /* Handy defines for ARCnet specific stuff */ | |
58 | ||
59 | /* The number of low I/O ports used by the card. */ | |
60 | #define ARCNET_TOTAL_SIZE 16 | |
61 | ||
62 | /* COM 9026 controller chip --> ARCnet register addresses */ | |
63 | #define _INTMASK (ioaddr+0) /* writable */ | |
64 | #define _STATUS (ioaddr+0) /* readable */ | |
65 | #define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */ | |
66 | #define _RESET (ioaddr+8) /* software reset (on read) */ | |
67 | #define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */ | |
68 | #define _ADDR_HI (ioaddr+15) /* Control registers for said */ | |
69 | #define _ADDR_LO (ioaddr+14) | |
70 | #define _CONFIG (ioaddr+2) /* Configuration register */ | |
71 | ||
72 | #undef ASTATUS | |
73 | #undef ACOMMAND | |
74 | #undef AINTMASK | |
75 | ||
76 | #define ASTATUS() inb(_STATUS) | |
77 | #define ACOMMAND(cmd) outb((cmd),_COMMAND) | |
78 | #define AINTMASK(msk) outb((msk),_INTMASK) | |
79 | #define SETCONF() outb((lp->config),_CONFIG) | |
80 | ||
81 | ||
82 | /**************************************************************************** | |
83 | * * | |
84 | * IO-mapped operation routines * | |
85 | * * | |
86 | ****************************************************************************/ | |
87 | ||
88 | #undef ONE_AT_A_TIME_TX | |
89 | #undef ONE_AT_A_TIME_RX | |
90 | ||
91 | static u_char get_buffer_byte(struct net_device *dev, unsigned offset) | |
92 | { | |
93 | int ioaddr = dev->base_addr; | |
94 | ||
95 | outb(offset >> 8, _ADDR_HI); | |
96 | outb(offset & 0xff, _ADDR_LO); | |
97 | ||
98 | return inb(_MEMDATA); | |
99 | } | |
100 | ||
101 | #ifdef ONE_AT_A_TIME_TX | |
102 | static void put_buffer_byte(struct net_device *dev, unsigned offset, u_char datum) | |
103 | { | |
104 | int ioaddr = dev->base_addr; | |
105 | ||
106 | outb(offset >> 8, _ADDR_HI); | |
107 | outb(offset & 0xff, _ADDR_LO); | |
108 | ||
109 | outb(datum, _MEMDATA); | |
110 | } | |
111 | ||
112 | #endif | |
113 | ||
114 | ||
115 | static void get_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest) | |
116 | { | |
117 | int ioaddr = dev->base_addr; | |
118 | ||
119 | outb((offset >> 8) | AUTOINCflag, _ADDR_HI); | |
120 | outb(offset & 0xff, _ADDR_LO); | |
121 | ||
122 | while (length--) | |
123 | #ifdef ONE_AT_A_TIME_RX | |
124 | *(dest++) = get_buffer_byte(dev, offset++); | |
125 | #else | |
126 | *(dest++) = inb(_MEMDATA); | |
127 | #endif | |
128 | } | |
129 | ||
130 | static void put_whole_buffer(struct net_device *dev, unsigned offset, unsigned length, char *dest) | |
131 | { | |
132 | int ioaddr = dev->base_addr; | |
133 | ||
134 | outb((offset >> 8) | AUTOINCflag, _ADDR_HI); | |
135 | outb(offset & 0xff, _ADDR_LO); | |
136 | ||
137 | while (length--) | |
138 | #ifdef ONE_AT_A_TIME_TX | |
139 | put_buffer_byte(dev, offset++, *(dest++)); | |
140 | #else | |
141 | outb(*(dest++), _MEMDATA); | |
142 | #endif | |
143 | } | |
144 | ||
145 | /* | |
146 | * We cannot probe for an IO mapped card either, although we can check that | |
147 | * it's where we were told it was, and even autoirq | |
148 | */ | |
149 | static int __init com90io_probe(struct net_device *dev) | |
150 | { | |
151 | int ioaddr = dev->base_addr, status; | |
152 | unsigned long airqmask; | |
153 | ||
154 | BUGLVL(D_NORMAL) printk(VERSION); | |
155 | BUGLVL(D_NORMAL) printk("E-mail me if you actually test this driver, please!\n"); | |
156 | ||
157 | if (!ioaddr) { | |
158 | BUGMSG(D_NORMAL, "No autoprobe for IO mapped cards; you " | |
159 | "must specify the base address!\n"); | |
160 | return -ENODEV; | |
161 | } | |
162 | if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "com90io probe")) { | |
fb911ee8 | 163 | BUGMSG(D_INIT_REASONS, "IO request_region %x-%x failed.\n", |
1da177e4 LT |
164 | ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1); |
165 | return -ENXIO; | |
166 | } | |
167 | if (ASTATUS() == 0xFF) { | |
168 | BUGMSG(D_INIT_REASONS, "IO address %x empty\n", ioaddr); | |
169 | goto err_out; | |
170 | } | |
171 | inb(_RESET); | |
172 | mdelay(RESETtime); | |
173 | ||
174 | status = ASTATUS(); | |
175 | ||
176 | if ((status & 0x9D) != (NORXflag | RECONflag | TXFREEflag | RESETflag)) { | |
177 | BUGMSG(D_INIT_REASONS, "Status invalid (%Xh).\n", status); | |
178 | goto err_out; | |
179 | } | |
180 | BUGMSG(D_INIT_REASONS, "Status after reset: %X\n", status); | |
181 | ||
182 | ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear); | |
183 | ||
184 | BUGMSG(D_INIT_REASONS, "Status after reset acknowledged: %X\n", status); | |
185 | ||
186 | status = ASTATUS(); | |
187 | ||
188 | if (status & RESETflag) { | |
189 | BUGMSG(D_INIT_REASONS, "Eternal reset (status=%Xh)\n", status); | |
190 | goto err_out; | |
191 | } | |
192 | outb((0x16 | IOMAPflag) & ~ENABLE16flag, _CONFIG); | |
193 | ||
194 | /* Read first loc'n of memory */ | |
195 | ||
196 | outb(AUTOINCflag, _ADDR_HI); | |
197 | outb(0, _ADDR_LO); | |
198 | ||
199 | if ((status = inb(_MEMDATA)) != 0xd1) { | |
200 | BUGMSG(D_INIT_REASONS, "Signature byte not found" | |
201 | " (%Xh instead).\n", status); | |
202 | goto err_out; | |
203 | } | |
204 | if (!dev->irq) { | |
205 | /* | |
206 | * if we do this, we're sure to get an IRQ since the | |
207 | * card has just reset and the NORXflag is on until | |
208 | * we tell it to start receiving. | |
209 | */ | |
210 | ||
211 | airqmask = probe_irq_on(); | |
212 | outb(NORXflag, _INTMASK); | |
213 | udelay(1); | |
214 | outb(0, _INTMASK); | |
215 | dev->irq = probe_irq_off(airqmask); | |
216 | ||
217 | if (dev->irq <= 0) { | |
218 | BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed\n"); | |
219 | goto err_out; | |
220 | } | |
221 | } | |
222 | release_region(ioaddr, ARCNET_TOTAL_SIZE); /* end of probing */ | |
223 | return com90io_found(dev); | |
224 | ||
225 | err_out: | |
226 | release_region(ioaddr, ARCNET_TOTAL_SIZE); | |
227 | return -ENODEV; | |
228 | } | |
229 | ||
230 | ||
231 | /* Set up the struct net_device associated with this card. Called after | |
232 | * probing succeeds. | |
233 | */ | |
234 | static int __init com90io_found(struct net_device *dev) | |
235 | { | |
236 | struct arcnet_local *lp; | |
237 | int ioaddr = dev->base_addr; | |
238 | int err; | |
239 | ||
240 | /* Reserve the irq */ | |
a0607fd3 | 241 | if (request_irq(dev->irq, arcnet_interrupt, 0, "arcnet (COM90xx-IO)", dev)) { |
1da177e4 LT |
242 | BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq); |
243 | return -ENODEV; | |
244 | } | |
fb911ee8 | 245 | /* Reserve the I/O region */ |
1da177e4 LT |
246 | if (!request_region(dev->base_addr, ARCNET_TOTAL_SIZE, "arcnet (COM90xx-IO)")) { |
247 | free_irq(dev->irq, dev); | |
248 | return -EBUSY; | |
249 | } | |
250 | ||
454d7c9b | 251 | lp = netdev_priv(dev); |
1da177e4 LT |
252 | lp->card_name = "COM90xx I/O"; |
253 | lp->hw.command = com90io_command; | |
254 | lp->hw.status = com90io_status; | |
255 | lp->hw.intmask = com90io_setmask; | |
256 | lp->hw.reset = com90io_reset; | |
257 | lp->hw.owner = THIS_MODULE; | |
258 | lp->hw.copy_to_card = com90io_copy_to_card; | |
259 | lp->hw.copy_from_card = com90io_copy_from_card; | |
260 | ||
261 | lp->config = (0x16 | IOMAPflag) & ~ENABLE16flag; | |
262 | SETCONF(); | |
263 | ||
264 | /* get and check the station ID from offset 1 in shmem */ | |
265 | ||
266 | dev->dev_addr[0] = get_buffer_byte(dev, 1); | |
267 | ||
268 | err = register_netdev(dev); | |
269 | if (err) { | |
270 | outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG); | |
271 | free_irq(dev->irq, dev); | |
272 | release_region(dev->base_addr, ARCNET_TOTAL_SIZE); | |
273 | return err; | |
274 | } | |
275 | ||
276 | BUGMSG(D_NORMAL, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n", | |
277 | dev->dev_addr[0], dev->base_addr, dev->irq); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | ||
283 | /* | |
284 | * Do a hardware reset on the card, and set up necessary registers. | |
285 | * | |
286 | * This should be called as little as possible, because it disrupts the | |
287 | * token on the network (causes a RECON) and requires a significant delay. | |
288 | * | |
289 | * However, it does make sure the card is in a defined state. | |
290 | */ | |
291 | static int com90io_reset(struct net_device *dev, int really_reset) | |
292 | { | |
454d7c9b | 293 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
294 | short ioaddr = dev->base_addr; |
295 | ||
296 | BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n", dev->name, ASTATUS()); | |
297 | ||
298 | if (really_reset) { | |
299 | /* reset the card */ | |
300 | inb(_RESET); | |
301 | mdelay(RESETtime); | |
302 | } | |
303 | /* Set the thing to IO-mapped, 8-bit mode */ | |
304 | lp->config = (0x1C | IOMAPflag) & ~ENABLE16flag; | |
305 | SETCONF(); | |
306 | ||
307 | ACOMMAND(CFLAGScmd | RESETclear); /* clear flags & end reset */ | |
308 | ACOMMAND(CFLAGScmd | CONFIGclear); | |
309 | ||
310 | /* verify that the ARCnet signature byte is present */ | |
311 | if (get_buffer_byte(dev, 0) != TESTvalue) { | |
312 | BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n"); | |
313 | return 1; | |
314 | } | |
315 | /* enable extended (512-byte) packets */ | |
316 | ACOMMAND(CONFIGcmd | EXTconf); | |
317 | ||
318 | /* done! return success. */ | |
319 | return 0; | |
320 | } | |
321 | ||
322 | ||
323 | static void com90io_command(struct net_device *dev, int cmd) | |
324 | { | |
325 | short ioaddr = dev->base_addr; | |
326 | ||
327 | ACOMMAND(cmd); | |
328 | } | |
329 | ||
330 | ||
331 | static int com90io_status(struct net_device *dev) | |
332 | { | |
333 | short ioaddr = dev->base_addr; | |
334 | ||
335 | return ASTATUS(); | |
336 | } | |
337 | ||
338 | ||
339 | static void com90io_setmask(struct net_device *dev, int mask) | |
340 | { | |
341 | short ioaddr = dev->base_addr; | |
342 | ||
343 | AINTMASK(mask); | |
344 | } | |
345 | ||
346 | static void com90io_copy_to_card(struct net_device *dev, int bufnum, int offset, | |
347 | void *buf, int count) | |
348 | { | |
349 | TIME("put_whole_buffer", count, put_whole_buffer(dev, bufnum * 512 + offset, count, buf)); | |
350 | } | |
351 | ||
352 | ||
353 | static void com90io_copy_from_card(struct net_device *dev, int bufnum, int offset, | |
354 | void *buf, int count) | |
355 | { | |
356 | TIME("get_whole_buffer", count, get_whole_buffer(dev, bufnum * 512 + offset, count, buf)); | |
357 | } | |
358 | ||
359 | static int io; /* use the insmod io= irq= shmem= options */ | |
360 | static int irq; | |
361 | static char device[9]; /* use eg. device=arc1 to change name */ | |
362 | ||
363 | module_param(io, int, 0); | |
364 | module_param(irq, int, 0); | |
365 | module_param_string(device, device, sizeof(device), 0); | |
366 | MODULE_LICENSE("GPL"); | |
367 | ||
368 | #ifndef MODULE | |
369 | static int __init com90io_setup(char *s) | |
370 | { | |
371 | int ints[4]; | |
372 | s = get_options(s, 4, ints); | |
373 | if (!ints[0]) | |
374 | return 0; | |
375 | switch (ints[0]) { | |
376 | default: /* ERROR */ | |
377 | printk("com90io: Too many arguments.\n"); | |
378 | case 2: /* IRQ */ | |
379 | irq = ints[2]; | |
380 | case 1: /* IO address */ | |
381 | io = ints[1]; | |
382 | } | |
383 | if (*s) | |
384 | snprintf(device, sizeof(device), "%s", s); | |
385 | return 1; | |
386 | } | |
387 | __setup("com90io=", com90io_setup); | |
388 | #endif | |
389 | ||
390 | static struct net_device *my_dev; | |
391 | ||
392 | static int __init com90io_init(void) | |
393 | { | |
394 | struct net_device *dev; | |
395 | int err; | |
396 | ||
397 | dev = alloc_arcdev(device); | |
398 | if (!dev) | |
399 | return -ENOMEM; | |
400 | ||
1da177e4 LT |
401 | dev->base_addr = io; |
402 | dev->irq = irq; | |
403 | if (dev->irq == 2) | |
404 | dev->irq = 9; | |
405 | ||
406 | err = com90io_probe(dev); | |
407 | ||
408 | if (err) { | |
409 | free_netdev(dev); | |
410 | return err; | |
411 | } | |
412 | ||
413 | my_dev = dev; | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void __exit com90io_exit(void) | |
418 | { | |
419 | struct net_device *dev = my_dev; | |
420 | int ioaddr = dev->base_addr; | |
421 | ||
422 | unregister_netdev(dev); | |
423 | ||
424 | /* Set the thing back to MMAP mode, in case the old driver is loaded later */ | |
425 | outb((inb(_CONFIG) & ~IOMAPflag), _CONFIG); | |
426 | ||
427 | free_irq(dev->irq, dev); | |
428 | release_region(dev->base_addr, ARCNET_TOTAL_SIZE); | |
429 | free_netdev(dev); | |
430 | } | |
431 | ||
432 | module_init(com90io_init) | |
433 | module_exit(com90io_exit) |