1 /*
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 
23 struct eisa_device_info {
24 	struct eisa_device_id id;
25 	char name[50];
26 };
27 
28 #ifdef CONFIG_EISA_NAMES
29 static 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 
37 static int enable_dev[EISA_MAX_FORCED_DEV];
38 static unsigned int enable_dev_count;
39 static int disable_dev[EISA_MAX_FORCED_DEV];
40 static unsigned int disable_dev_count;
41 
is_forced_dev(int * forced_tab,int forced_count,struct eisa_root_device * root,struct eisa_device * edev)42 static 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 
eisa_name_device(struct eisa_device * edev)58 static 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 				sizeof(edev->pretty_name));
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 
decode_eisa_sig(unsigned long addr)76 static 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 
eisa_bus_match(struct device * dev,struct device_driver * drv)109 static 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 
eisa_bus_uevent(struct device * dev,struct kobj_uevent_env * env)131 static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
132 {
133 	struct eisa_device *edev = to_eisa_device(dev);
134 
135 	add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
136 	return 0;
137 }
138 
139 struct bus_type eisa_bus_type = {
140 	.name  = "eisa",
141 	.match = eisa_bus_match,
142 	.uevent = eisa_bus_uevent,
143 };
144 EXPORT_SYMBOL(eisa_bus_type);
145 
eisa_driver_register(struct eisa_driver * edrv)146 int eisa_driver_register(struct eisa_driver *edrv)
147 {
148 	edrv->driver.bus = &eisa_bus_type;
149 	return driver_register(&edrv->driver);
150 }
151 EXPORT_SYMBOL(eisa_driver_register);
152 
eisa_driver_unregister(struct eisa_driver * edrv)153 void eisa_driver_unregister(struct eisa_driver *edrv)
154 {
155 	driver_unregister(&edrv->driver);
156 }
157 EXPORT_SYMBOL(eisa_driver_unregister);
158 
eisa_show_sig(struct device * dev,struct device_attribute * attr,char * buf)159 static ssize_t eisa_show_sig(struct device *dev, struct device_attribute *attr,
160 			     char *buf)
161 {
162 	struct eisa_device *edev = to_eisa_device(dev);
163 	return sprintf(buf, "%s\n", edev->id.sig);
164 }
165 
166 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
167 
eisa_show_state(struct device * dev,struct device_attribute * attr,char * buf)168 static ssize_t eisa_show_state(struct device *dev,
169 			       struct device_attribute *attr,
170 			       char *buf)
171 {
172 	struct eisa_device *edev = to_eisa_device(dev);
173 	return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
174 }
175 
176 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
177 
eisa_show_modalias(struct device * dev,struct device_attribute * attr,char * buf)178 static ssize_t eisa_show_modalias(struct device *dev,
179 				  struct device_attribute *attr,
180 				  char *buf)
181 {
182 	struct eisa_device *edev = to_eisa_device(dev);
183 	return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
184 }
185 
186 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
187 
eisa_init_device(struct eisa_root_device * root,struct eisa_device * edev,int slot)188 static int __init eisa_init_device(struct eisa_root_device *root,
189 				   struct eisa_device *edev,
190 				   int slot)
191 {
192 	char *sig;
193 	unsigned long sig_addr;
194 	int i;
195 
196 	sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
197 
198 	sig = decode_eisa_sig(sig_addr);
199 	if (!sig)
200 		return -1;	/* No EISA device here */
201 
202 	memcpy(edev->id.sig, sig, EISA_SIG_LEN);
203 	edev->slot = slot;
204 	edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
205 		      & EISA_CONFIG_ENABLED;
206 	edev->base_addr = SLOT_ADDRESS(root, slot);
207 	edev->dma_mask = root->dma_mask; /* Default DMA mask */
208 	eisa_name_device(edev);
209 	edev->dev.parent = root->dev;
210 	edev->dev.bus = &eisa_bus_type;
211 	edev->dev.dma_mask = &edev->dma_mask;
212 	edev->dev.coherent_dma_mask = edev->dma_mask;
213 	dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
214 
215 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
216 #ifdef CONFIG_EISA_NAMES
217 		edev->res[i].name = edev->pretty_name;
218 #else
219 		edev->res[i].name = edev->id.sig;
220 #endif
221 	}
222 
223 	if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
224 		edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
225 
226 	if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
227 		edev->state = EISA_CONFIG_FORCED;
228 
229 	return 0;
230 }
231 
eisa_register_device(struct eisa_device * edev)232 static int __init eisa_register_device(struct eisa_device *edev)
233 {
234 	int rc = device_register(&edev->dev);
235 	if (rc) {
236 		put_device(&edev->dev);
237 		return rc;
238 	}
239 
240 	rc = device_create_file(&edev->dev, &dev_attr_signature);
241 	if (rc)
242 		goto err_devreg;
243 	rc = device_create_file(&edev->dev, &dev_attr_enabled);
244 	if (rc)
245 		goto err_sig;
246 	rc = device_create_file(&edev->dev, &dev_attr_modalias);
247 	if (rc)
248 		goto err_enab;
249 
250 	return 0;
251 
252 err_enab:
253 	device_remove_file(&edev->dev, &dev_attr_enabled);
254 err_sig:
255 	device_remove_file(&edev->dev, &dev_attr_signature);
256 err_devreg:
257 	device_unregister(&edev->dev);
258 	return rc;
259 }
260 
eisa_request_resources(struct eisa_root_device * root,struct eisa_device * edev,int slot)261 static int __init eisa_request_resources(struct eisa_root_device *root,
262 					 struct eisa_device *edev,
263 					 int slot)
264 {
265 	int i;
266 
267 	for (i = 0; i < EISA_MAX_RESOURCES; i++) {
268 		/* Don't register resource for slot 0, since this is
269 		 * very likely to fail... :-( Instead, grab the EISA
270 		 * id, now we can display something in /proc/ioports.
271 		 */
272 
273 		/* Only one region for mainboard */
274 		if (!slot && i > 0) {
275 			edev->res[i].start = edev->res[i].end = 0;
276 			continue;
277 		}
278 
279 		if (slot) {
280 			edev->res[i].name  = NULL;
281 			edev->res[i].start = SLOT_ADDRESS(root, slot)
282 					     + (i * 0x400);
283 			edev->res[i].end   = edev->res[i].start + 0xff;
284 			edev->res[i].flags = IORESOURCE_IO;
285 		} else {
286 			edev->res[i].name  = NULL;
287 			edev->res[i].start = SLOT_ADDRESS(root, slot)
288 					     + EISA_VENDOR_ID_OFFSET;
289 			edev->res[i].end   = edev->res[i].start + 3;
290 			edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
291 		}
292 
293 		if (request_resource(root->res, &edev->res[i]))
294 			goto failed;
295 	}
296 
297 	return 0;
298 
299  failed:
300 	while (--i >= 0)
301 		release_resource(&edev->res[i]);
302 
303 	return -1;
304 }
305 
eisa_release_resources(struct eisa_device * edev)306 static void __init eisa_release_resources(struct eisa_device *edev)
307 {
308 	int i;
309 
310 	for (i = 0; i < EISA_MAX_RESOURCES; i++)
311 		if (edev->res[i].start || edev->res[i].end)
312 			release_resource(&edev->res[i]);
313 }
314 
eisa_probe(struct eisa_root_device * root)315 static int __init eisa_probe(struct eisa_root_device *root)
316 {
317 	int i, c;
318 	struct eisa_device *edev;
319 	char *enabled_str;
320 
321 	dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
322 
323 	/* First try to get hold of slot 0. If there is no device
324 	 * here, simply fail, unless root->force_probe is set. */
325 
326 	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
327 	if (!edev)
328 		return -ENOMEM;
329 
330 	if (eisa_request_resources(root, edev, 0)) {
331 		dev_warn(root->dev,
332 			 "EISA: Cannot allocate resource for mainboard\n");
333 		kfree(edev);
334 		if (!root->force_probe)
335 			return -EBUSY;
336 		goto force_probe;
337 	}
338 
339 	if (eisa_init_device(root, edev, 0)) {
340 		eisa_release_resources(edev);
341 		kfree(edev);
342 		if (!root->force_probe)
343 			return -ENODEV;
344 		goto force_probe;
345 	}
346 
347 	dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
348 
349 	if (eisa_register_device(edev)) {
350 		dev_err(&edev->dev, "EISA: Failed to register %s\n",
351 			edev->id.sig);
352 		eisa_release_resources(edev);
353 		kfree(edev);
354 	}
355 
356  force_probe:
357 
358 	for (c = 0, i = 1; i <= root->slots; i++) {
359 		edev = kzalloc(sizeof(*edev), GFP_KERNEL);
360 		if (!edev) {
361 			dev_err(root->dev, "EISA: Out of memory for slot %d\n",
362 				i);
363 			continue;
364 		}
365 
366 		if (eisa_request_resources(root, edev, i)) {
367 			dev_warn(root->dev,
368 				 "Cannot allocate resource for EISA slot %d\n",
369 				 i);
370 			kfree(edev);
371 			continue;
372 		}
373 
374 		if (eisa_init_device(root, edev, i)) {
375 			eisa_release_resources(edev);
376 			kfree(edev);
377 			continue;
378 		}
379 
380 		if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
381 			enabled_str = " (forced enabled)";
382 		else if (edev->state == EISA_CONFIG_FORCED)
383 			enabled_str = " (forced disabled)";
384 		else if (edev->state == 0)
385 			enabled_str = " (disabled)";
386 		else
387 			enabled_str = "";
388 
389 		dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
390 			 edev->id.sig, enabled_str);
391 
392 		c++;
393 
394 		if (eisa_register_device(edev)) {
395 			dev_err(&edev->dev, "EISA: Failed to register %s\n",
396 				edev->id.sig);
397 			eisa_release_resources(edev);
398 			kfree(edev);
399 		}
400 	}
401 
402 	dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
403 	return 0;
404 }
405 
406 static struct resource eisa_root_res = {
407 	.name  = "EISA root resource",
408 	.start = 0,
409 	.end   = 0xffffffff,
410 	.flags = IORESOURCE_IO,
411 };
412 
413 static int eisa_bus_count;
414 
eisa_root_register(struct eisa_root_device * root)415 int __init eisa_root_register(struct eisa_root_device *root)
416 {
417 	int err;
418 
419 	/* Use our own resources to check if this bus base address has
420 	 * been already registered. This prevents the virtual root
421 	 * device from registering after the real one has, for
422 	 * example... */
423 
424 	root->eisa_root_res.name  = eisa_root_res.name;
425 	root->eisa_root_res.start = root->res->start;
426 	root->eisa_root_res.end   = root->res->end;
427 	root->eisa_root_res.flags = IORESOURCE_BUSY;
428 
429 	err = request_resource(&eisa_root_res, &root->eisa_root_res);
430 	if (err)
431 		return err;
432 
433 	root->bus_nr = eisa_bus_count++;
434 
435 	err = eisa_probe(root);
436 	if (err)
437 		release_resource(&root->eisa_root_res);
438 
439 	return err;
440 }
441 
eisa_init(void)442 static int __init eisa_init(void)
443 {
444 	int r;
445 
446 	r = bus_register(&eisa_bus_type);
447 	if (r)
448 		return r;
449 
450 	printk(KERN_INFO "EISA bus registered\n");
451 	return 0;
452 }
453 
454 module_param_array(enable_dev, int, &enable_dev_count, 0444);
455 module_param_array(disable_dev, int, &disable_dev_count, 0444);
456 
457 postcore_initcall(eisa_init);
458 
459 int EISA_bus;		/* for legacy drivers */
460 EXPORT_SYMBOL(EISA_bus);
461