blob: 1937743c8e2971bb15b9f1d703aca168be4240e2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * EISA bus support functions for sysfs.
3 *
4 * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
5 *
6 * This code is released under the GPL version 2.
7 */
8
9#include <linux/kernel.h>
10#include <linux/device.h>
11#include <linux/eisa.h>
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/ioport.h>
17#include <asm/io.h>
18
19#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
20
21#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
22
23struct eisa_device_info {
24 struct eisa_device_id id;
25 char name[DEVICE_NAME_SIZE];
26};
27
28#ifdef CONFIG_EISA_NAMES
29static struct eisa_device_info __initdata eisa_table[] = {
30#include "devlist.h"
31};
32#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
33#endif
34
35#define EISA_MAX_FORCED_DEV 16
36
37static int enable_dev[EISA_MAX_FORCED_DEV];
38static int enable_dev_count;
39static int disable_dev[EISA_MAX_FORCED_DEV];
40static int disable_dev_count;
41
42static int is_forced_dev (int *forced_tab,
43 int forced_count,
44 struct eisa_root_device *root,
45 struct eisa_device *edev)
46{
47 int i, x;
48
49 for (i = 0; i < forced_count; i++) {
50 x = (root->bus_nr << 8) | edev->slot;
51 if (forced_tab[i] == x)
52 return 1;
53 }
54
55 return 0;
56}
57
58static void __init eisa_name_device (struct eisa_device *edev)
59{
60#ifdef CONFIG_EISA_NAMES
61 int i;
62 for (i = 0; i < EISA_INFOS; i++) {
63 if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
64 strlcpy (edev->pretty_name,
65 eisa_table[i].name,
66 DEVICE_NAME_SIZE);
67 return;
68 }
69 }
70
71 /* No name was found */
72 sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
73#endif
74}
75
76static char __init *decode_eisa_sig(unsigned long addr)
77{
78 static char sig_str[EISA_SIG_LEN];
79 u8 sig[4];
80 u16 rev;
81 int i;
82
83 for (i = 0; i < 4; i++) {
84#ifdef CONFIG_EISA_VLB_PRIMING
85 /*
86 * This ugly stuff is used to wake up VL-bus cards
87 * (AHA-284x is the only known example), so we can
88 * read the EISA id.
89 *
90 * Thankfully, this only exists on x86...
91 */
92 outb(0x80 + i, addr);
93#endif
94 sig[i] = inb (addr + i);
95
96 if (!i && (sig[0] & 0x80))
97 return NULL;
98 }
99
100 sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
101 sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
102 sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
103 rev = (sig[2] << 8) | sig[3];
104 sprintf(sig_str + 3, "%04X", rev);
105
106 return sig_str;
107}
108
109static int eisa_bus_match (struct device *dev, struct device_driver *drv)
110{
111 struct eisa_device *edev = to_eisa_device (dev);
112 struct eisa_driver *edrv = to_eisa_driver (drv);
113 const struct eisa_device_id *eids = edrv->id_table;
114
115 if (!eids)
116 return 0;
117
118 while (strlen (eids->sig)) {
119 if (!strcmp (eids->sig, edev->id.sig) &&
120 edev->state & EISA_CONFIG_ENABLED) {
121 edev->id.driver_data = eids->driver_data;
122 return 1;
123 }
124
125 eids++;
126 }
127
128 return 0;
129}
130
131struct bus_type eisa_bus_type = {
132 .name = "eisa",
133 .match = eisa_bus_match,
134};
135
136int eisa_driver_register (struct eisa_driver *edrv)
137{
138 int r;
139
140 edrv->driver.bus = &eisa_bus_type;
141 if ((r = driver_register (&edrv->driver)) < 0)
142 return r;
143
144 return 0;
145}
146
147void eisa_driver_unregister (struct eisa_driver *edrv)
148{
149 driver_unregister (&edrv->driver);
150}
151
Yani Ioannou74880c02005-05-17 06:41:12 -0400152static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 struct eisa_device *edev = to_eisa_device (dev);
155 return sprintf (buf,"%s\n", edev->id.sig);
156}
157
158static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
159
Yani Ioannou74880c02005-05-17 06:41:12 -0400160static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 struct eisa_device *edev = to_eisa_device (dev);
163 return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
164}
165
166static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
167
168static int __init eisa_init_device (struct eisa_root_device *root,
169 struct eisa_device *edev,
170 int slot)
171{
172 char *sig;
173 unsigned long sig_addr;
174 int i;
175
176 sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
177
178 if (!(sig = decode_eisa_sig (sig_addr)))
179 return -1; /* No EISA device here */
180
181 memcpy (edev->id.sig, sig, EISA_SIG_LEN);
182 edev->slot = slot;
183 edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
184 edev->base_addr = SLOT_ADDRESS (root, slot);
185 edev->dma_mask = root->dma_mask; /* Default DMA mask */
186 eisa_name_device (edev);
187 edev->dev.parent = root->dev;
188 edev->dev.bus = &eisa_bus_type;
189 edev->dev.dma_mask = &edev->dma_mask;
190 edev->dev.coherent_dma_mask = edev->dma_mask;
191 sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);
192
193 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
194#ifdef CONFIG_EISA_NAMES
195 edev->res[i].name = edev->pretty_name;
196#else
197 edev->res[i].name = edev->id.sig;
198#endif
199 }
200
201 if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
202 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
203
204 if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
205 edev->state = EISA_CONFIG_FORCED;
206
207 return 0;
208}
209
210static int __init eisa_register_device (struct eisa_device *edev)
211{
212 if (device_register (&edev->dev))
213 return -1;
214
215 device_create_file (&edev->dev, &dev_attr_signature);
216 device_create_file (&edev->dev, &dev_attr_enabled);
217
218 return 0;
219}
220
221static int __init eisa_request_resources (struct eisa_root_device *root,
222 struct eisa_device *edev,
223 int slot)
224{
225 int i;
226
227 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
228 /* Don't register resource for slot 0, since this is
229 * very likely to fail... :-( Instead, grab the EISA
230 * id, now we can display something in /proc/ioports.
231 */
232
233 /* Only one region for mainboard */
234 if (!slot && i > 0) {
235 edev->res[i].start = edev->res[i].end = 0;
236 continue;
237 }
238
239 if (slot) {
240 edev->res[i].name = NULL;
241 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
242 edev->res[i].end = edev->res[i].start + 0xff;
243 edev->res[i].flags = IORESOURCE_IO;
244 } else {
245 edev->res[i].name = NULL;
246 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
247 edev->res[i].end = edev->res[i].start + 3;
248 edev->res[i].flags = IORESOURCE_BUSY;
249 }
250
251 if (request_resource (root->res, &edev->res[i]))
252 goto failed;
253 }
254
255 return 0;
256
257 failed:
258 while (--i >= 0)
259 release_resource (&edev->res[i]);
260
261 return -1;
262}
263
264static void __init eisa_release_resources (struct eisa_device *edev)
265{
266 int i;
267
268 for (i = 0; i < EISA_MAX_RESOURCES; i++)
269 if (edev->res[i].start || edev->res[i].end)
270 release_resource (&edev->res[i]);
271}
272
273static int __init eisa_probe (struct eisa_root_device *root)
274{
275 int i, c;
276 struct eisa_device *edev;
277
278 printk (KERN_INFO "EISA: Probing bus %d at %s\n",
279 root->bus_nr, root->dev->bus_id);
280
281 /* First try to get hold of slot 0. If there is no device
282 * here, simply fail, unless root->force_probe is set. */
283
284 if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
285 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
286 return -ENOMEM;
287 }
288
289 memset (edev, 0, sizeof (*edev));
290
291 if (eisa_request_resources (root, edev, 0)) {
292 printk (KERN_WARNING \
293 "EISA: Cannot allocate resource for mainboard\n");
294 kfree (edev);
295 if (!root->force_probe)
296 return -EBUSY;
297 goto force_probe;
298 }
299
300 if (eisa_init_device (root, edev, 0)) {
301 eisa_release_resources (edev);
302 kfree (edev);
303 if (!root->force_probe)
304 return -ENODEV;
305 goto force_probe;
306 }
307
308 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
309
310 if (eisa_register_device (edev)) {
311 printk (KERN_ERR "EISA: Failed to register %s\n",
312 edev->id.sig);
313 eisa_release_resources (edev);
314 kfree (edev);
315 }
316
317 force_probe:
318
319 for (c = 0, i = 1; i <= root->slots; i++) {
320 if (!(edev = kmalloc (sizeof (*edev), GFP_KERNEL))) {
321 printk (KERN_ERR "EISA: Out of memory for slot %d\n",
322 i);
323 continue;
324 }
325
326 memset (edev, 0, sizeof (*edev));
327
328 if (eisa_request_resources (root, edev, i)) {
329 printk (KERN_WARNING \
330 "Cannot allocate resource for EISA slot %d\n",
331 i);
332 kfree (edev);
333 continue;
334 }
335
336 if (eisa_init_device (root, edev, i)) {
337 eisa_release_resources (edev);
338 kfree (edev);
339 continue;
340 }
341
342 printk (KERN_INFO "EISA: slot %d : %s detected",
343 i, edev->id.sig);
344
345 switch (edev->state) {
346 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
347 printk (" (forced enabled)");
348 break;
349
350 case EISA_CONFIG_FORCED:
351 printk (" (forced disabled)");
352 break;
353
354 case 0:
355 printk (" (disabled)");
356 break;
357 }
358
359 printk (".\n");
360
361 c++;
362
363 if (eisa_register_device (edev)) {
364 printk (KERN_ERR "EISA: Failed to register %s\n",
365 edev->id.sig);
366 eisa_release_resources (edev);
367 kfree (edev);
368 }
369 }
370
371 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
372
373 return 0;
374}
375
376static struct resource eisa_root_res = {
377 .name = "EISA root resource",
378 .start = 0,
379 .end = 0xffffffff,
380 .flags = IORESOURCE_IO,
381};
382
383static int eisa_bus_count;
384
385int __init eisa_root_register (struct eisa_root_device *root)
386{
387 int err;
388
389 /* Use our own resources to check if this bus base address has
390 * been already registered. This prevents the virtual root
391 * device from registering after the real one has, for
392 * example... */
393
394 root->eisa_root_res.name = eisa_root_res.name;
395 root->eisa_root_res.start = root->res->start;
396 root->eisa_root_res.end = root->res->end;
397 root->eisa_root_res.flags = IORESOURCE_BUSY;
398
399 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
400 return err;
401
402 root->bus_nr = eisa_bus_count++;
403
404 if ((err = eisa_probe (root)))
405 release_resource (&root->eisa_root_res);
406
407 return err;
408}
409
410static int __init eisa_init (void)
411{
412 int r;
413
414 if ((r = bus_register (&eisa_bus_type)))
415 return r;
416
417 printk (KERN_INFO "EISA bus registered\n");
418 return 0;
419}
420
421module_param_array(enable_dev, int, &enable_dev_count, 0444);
422module_param_array(disable_dev, int, &disable_dev_count, 0444);
423
424postcore_initcall (eisa_init);
425
426int EISA_bus; /* for legacy drivers */
427EXPORT_SYMBOL (EISA_bus);
428EXPORT_SYMBOL (eisa_bus_type);
429EXPORT_SYMBOL (eisa_driver_register);
430EXPORT_SYMBOL (eisa_driver_unregister);