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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * EISA bus support functions for sysfs.
4 *
5 * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
6 */
7
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/eisa.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/ioport.h>
16#include <asm/io.h>
17
18#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
19
20#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
21
22struct eisa_device_info {
23 struct eisa_device_id id;
24 char name[50];
25};
26
27#ifdef CONFIG_EISA_NAMES
28static struct eisa_device_info __initdata eisa_table[] = {
29#include "devlist.h"
30};
31#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
32#endif
33
34#define EISA_MAX_FORCED_DEV 16
35
36static int enable_dev[EISA_MAX_FORCED_DEV];
37static unsigned int enable_dev_count;
38static int disable_dev[EISA_MAX_FORCED_DEV];
39static unsigned int disable_dev_count;
40
41static int is_forced_dev(int *forced_tab,
42 int forced_count,
43 struct eisa_root_device *root,
44 struct eisa_device *edev)
45{
46 int i, x;
47
48 for (i = 0; i < forced_count; i++) {
49 x = (root->bus_nr << 8) | edev->slot;
50 if (forced_tab[i] == x)
51 return 1;
52 }
53
54 return 0;
55}
56
57static void __init eisa_name_device(struct eisa_device *edev)
58{
59#ifdef CONFIG_EISA_NAMES
60 int i;
61 for (i = 0; i < EISA_INFOS; i++) {
62 if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
63 strscpy(edev->pretty_name,
64 eisa_table[i].name,
65 sizeof(edev->pretty_name));
66 return;
67 }
68 }
69
70 /* No name was found */
71 sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
72#endif
73}
74
75static char __init *decode_eisa_sig(unsigned long addr)
76{
77 static char sig_str[EISA_SIG_LEN];
78 u8 sig[4];
79 u16 rev;
80 int i;
81
82 for (i = 0; i < 4; i++) {
83#ifdef CONFIG_EISA_VLB_PRIMING
84 /*
85 * This ugly stuff is used to wake up VL-bus cards
86 * (AHA-284x is the only known example), so we can
87 * read the EISA id.
88 *
89 * Thankfully, this only exists on x86...
90 */
91 outb(0x80 + i, addr);
92#endif
93 sig[i] = inb(addr + i);
94
95 if (!i && (sig[0] & 0x80))
96 return NULL;
97 }
98
99 sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
100 sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
101 sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
102 rev = (sig[2] << 8) | sig[3];
103 sprintf(sig_str + 3, "%04X", rev);
104
105 return sig_str;
106}
107
108static int eisa_bus_match(struct device *dev, struct device_driver *drv)
109{
110 struct eisa_device *edev = to_eisa_device(dev);
111 struct eisa_driver *edrv = to_eisa_driver(drv);
112 const struct eisa_device_id *eids = edrv->id_table;
113
114 if (!eids)
115 return 0;
116
117 while (strlen(eids->sig)) {
118 if (!strcmp(eids->sig, edev->id.sig) &&
119 edev->state & EISA_CONFIG_ENABLED) {
120 edev->id.driver_data = eids->driver_data;
121 return 1;
122 }
123
124 eids++;
125 }
126
127 return 0;
128}
129
130static int eisa_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
131{
132 const struct eisa_device *edev = to_eisa_device(dev);
133
134 add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
135 return 0;
136}
137
138struct bus_type eisa_bus_type = {
139 .name = "eisa",
140 .match = eisa_bus_match,
141 .uevent = eisa_bus_uevent,
142};
143EXPORT_SYMBOL(eisa_bus_type);
144
145int eisa_driver_register(struct eisa_driver *edrv)
146{
147 edrv->driver.bus = &eisa_bus_type;
148 return driver_register(&edrv->driver);
149}
150EXPORT_SYMBOL(eisa_driver_register);
151
152void eisa_driver_unregister(struct eisa_driver *edrv)
153{
154 driver_unregister(&edrv->driver);
155}
156EXPORT_SYMBOL(eisa_driver_unregister);
157
158static ssize_t signature_show(struct device *dev,
159 struct device_attribute *attr, char *buf)
160{
161 struct eisa_device *edev = to_eisa_device(dev);
162 return sprintf(buf, "%s\n", edev->id.sig);
163}
164static DEVICE_ATTR_RO(signature);
165
166static ssize_t enabled_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
168{
169 struct eisa_device *edev = to_eisa_device(dev);
170 return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
171}
172static DEVICE_ATTR_RO(enabled);
173
174static ssize_t modalias_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
176{
177 struct eisa_device *edev = to_eisa_device(dev);
178 return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
179}
180static DEVICE_ATTR_RO(modalias);
181
182static int __init eisa_init_device(struct eisa_root_device *root,
183 struct eisa_device *edev,
184 int slot)
185{
186 char *sig;
187 unsigned long sig_addr;
188 int i;
189
190 sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
191
192 sig = decode_eisa_sig(sig_addr);
193 if (!sig)
194 return -1; /* No EISA device here */
195
196 memcpy(edev->id.sig, sig, EISA_SIG_LEN);
197 edev->slot = slot;
198 edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
199 & EISA_CONFIG_ENABLED;
200 edev->base_addr = SLOT_ADDRESS(root, slot);
201 edev->dma_mask = root->dma_mask; /* Default DMA mask */
202 eisa_name_device(edev);
203 edev->dev.parent = root->dev;
204 edev->dev.bus = &eisa_bus_type;
205 edev->dev.dma_mask = &edev->dma_mask;
206 edev->dev.coherent_dma_mask = edev->dma_mask;
207 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
208
209 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
210#ifdef CONFIG_EISA_NAMES
211 edev->res[i].name = edev->pretty_name;
212#else
213 edev->res[i].name = edev->id.sig;
214#endif
215 }
216
217 if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
218 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
219
220 if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
221 edev->state = EISA_CONFIG_FORCED;
222
223 return 0;
224}
225
226static int __init eisa_register_device(struct eisa_device *edev)
227{
228 int rc = device_register(&edev->dev);
229 if (rc) {
230 put_device(&edev->dev);
231 return rc;
232 }
233
234 rc = device_create_file(&edev->dev, &dev_attr_signature);
235 if (rc)
236 goto err_devreg;
237 rc = device_create_file(&edev->dev, &dev_attr_enabled);
238 if (rc)
239 goto err_sig;
240 rc = device_create_file(&edev->dev, &dev_attr_modalias);
241 if (rc)
242 goto err_enab;
243
244 return 0;
245
246err_enab:
247 device_remove_file(&edev->dev, &dev_attr_enabled);
248err_sig:
249 device_remove_file(&edev->dev, &dev_attr_signature);
250err_devreg:
251 device_unregister(&edev->dev);
252 return rc;
253}
254
255static int __init eisa_request_resources(struct eisa_root_device *root,
256 struct eisa_device *edev,
257 int slot)
258{
259 int i;
260
261 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
262 /* Don't register resource for slot 0, since this is
263 * very likely to fail... :-( Instead, grab the EISA
264 * id, now we can display something in /proc/ioports.
265 */
266
267 /* Only one region for mainboard */
268 if (!slot && i > 0) {
269 edev->res[i].start = edev->res[i].end = 0;
270 continue;
271 }
272
273 if (slot) {
274 edev->res[i].name = NULL;
275 edev->res[i].start = SLOT_ADDRESS(root, slot)
276 + (i * 0x400);
277 edev->res[i].end = edev->res[i].start + 0xff;
278 edev->res[i].flags = IORESOURCE_IO;
279 } else {
280 edev->res[i].name = NULL;
281 edev->res[i].start = SLOT_ADDRESS(root, slot)
282 + EISA_VENDOR_ID_OFFSET;
283 edev->res[i].end = edev->res[i].start + 3;
284 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
285 }
286
287 if (request_resource(root->res, &edev->res[i]))
288 goto failed;
289 }
290
291 return 0;
292
293 failed:
294 while (--i >= 0)
295 release_resource(&edev->res[i]);
296
297 return -1;
298}
299
300static void __init eisa_release_resources(struct eisa_device *edev)
301{
302 int i;
303
304 for (i = 0; i < EISA_MAX_RESOURCES; i++)
305 if (edev->res[i].start || edev->res[i].end)
306 release_resource(&edev->res[i]);
307}
308
309static int __init eisa_probe(struct eisa_root_device *root)
310{
311 int i, c;
312 struct eisa_device *edev;
313 char *enabled_str;
314
315 dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
316
317 /* First try to get hold of slot 0. If there is no device
318 * here, simply fail, unless root->force_probe is set. */
319
320 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
321 if (!edev)
322 return -ENOMEM;
323
324 if (eisa_request_resources(root, edev, 0)) {
325 dev_warn(root->dev,
326 "EISA: Cannot allocate resource for mainboard\n");
327 kfree(edev);
328 if (!root->force_probe)
329 return -EBUSY;
330 goto force_probe;
331 }
332
333 if (eisa_init_device(root, edev, 0)) {
334 eisa_release_resources(edev);
335 kfree(edev);
336 if (!root->force_probe)
337 return -ENODEV;
338 goto force_probe;
339 }
340
341 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
342
343 if (eisa_register_device(edev)) {
344 dev_err(&edev->dev, "EISA: Failed to register %s\n",
345 edev->id.sig);
346 eisa_release_resources(edev);
347 kfree(edev);
348 }
349
350 force_probe:
351
352 for (c = 0, i = 1; i <= root->slots; i++) {
353 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
354 if (!edev) {
355 dev_err(root->dev, "EISA: Out of memory for slot %d\n",
356 i);
357 continue;
358 }
359
360 if (eisa_request_resources(root, edev, i)) {
361 dev_warn(root->dev,
362 "Cannot allocate resource for EISA slot %d\n",
363 i);
364 kfree(edev);
365 continue;
366 }
367
368 if (eisa_init_device(root, edev, i)) {
369 eisa_release_resources(edev);
370 kfree(edev);
371 continue;
372 }
373
374 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
375 enabled_str = " (forced enabled)";
376 else if (edev->state == EISA_CONFIG_FORCED)
377 enabled_str = " (forced disabled)";
378 else if (edev->state == 0)
379 enabled_str = " (disabled)";
380 else
381 enabled_str = "";
382
383 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
384 edev->id.sig, enabled_str);
385
386 c++;
387
388 if (eisa_register_device(edev)) {
389 dev_err(&edev->dev, "EISA: Failed to register %s\n",
390 edev->id.sig);
391 eisa_release_resources(edev);
392 kfree(edev);
393 }
394 }
395
396 dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
397 return 0;
398}
399
400static struct resource eisa_root_res = {
401 .name = "EISA root resource",
402 .start = 0,
403 .end = 0xffffffff,
404 .flags = IORESOURCE_IO,
405};
406
407static int eisa_bus_count;
408
409int __init eisa_root_register(struct eisa_root_device *root)
410{
411 int err;
412
413 /* Use our own resources to check if this bus base address has
414 * been already registered. This prevents the virtual root
415 * device from registering after the real one has, for
416 * example... */
417
418 root->eisa_root_res.name = eisa_root_res.name;
419 root->eisa_root_res.start = root->res->start;
420 root->eisa_root_res.end = root->res->end;
421 root->eisa_root_res.flags = IORESOURCE_BUSY;
422
423 err = request_resource(&eisa_root_res, &root->eisa_root_res);
424 if (err)
425 return err;
426
427 root->bus_nr = eisa_bus_count++;
428
429 err = eisa_probe(root);
430 if (err)
431 release_resource(&root->eisa_root_res);
432
433 return err;
434}
435
436static int __init eisa_init(void)
437{
438 int r;
439
440 r = bus_register(&eisa_bus_type);
441 if (r)
442 return r;
443
444 printk(KERN_INFO "EISA bus registered\n");
445 return 0;
446}
447
448module_param_array(enable_dev, int, &enable_dev_count, 0444);
449module_param_array(disable_dev, int, &disable_dev_count, 0444);
450
451postcore_initcall(eisa_init);
452
453int EISA_bus; /* for legacy drivers */
454EXPORT_SYMBOL(EISA_bus);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * EISA bus support functions for sysfs.
4 *
5 * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
6 */
7
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/eisa.h>
11#include <linux/module.h>
12#include <linux/moduleparam.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/ioport.h>
16#include <asm/io.h>
17
18#define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
19
20#define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
21
22struct eisa_device_info {
23 struct eisa_device_id id;
24 char name[50];
25};
26
27#ifdef CONFIG_EISA_NAMES
28static struct eisa_device_info __initdata eisa_table[] = {
29#include "devlist.h"
30};
31#define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
32#endif
33
34#define EISA_MAX_FORCED_DEV 16
35
36static int enable_dev[EISA_MAX_FORCED_DEV];
37static unsigned int enable_dev_count;
38static int disable_dev[EISA_MAX_FORCED_DEV];
39static unsigned int disable_dev_count;
40
41static int is_forced_dev(int *forced_tab,
42 int forced_count,
43 struct eisa_root_device *root,
44 struct eisa_device *edev)
45{
46 int i, x;
47
48 for (i = 0; i < forced_count; i++) {
49 x = (root->bus_nr << 8) | edev->slot;
50 if (forced_tab[i] == x)
51 return 1;
52 }
53
54 return 0;
55}
56
57static void __init eisa_name_device(struct eisa_device *edev)
58{
59#ifdef CONFIG_EISA_NAMES
60 int i;
61 for (i = 0; i < EISA_INFOS; i++) {
62 if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
63 strlcpy(edev->pretty_name,
64 eisa_table[i].name,
65 sizeof(edev->pretty_name));
66 return;
67 }
68 }
69
70 /* No name was found */
71 sprintf(edev->pretty_name, "EISA device %.7s", edev->id.sig);
72#endif
73}
74
75static char __init *decode_eisa_sig(unsigned long addr)
76{
77 static char sig_str[EISA_SIG_LEN];
78 u8 sig[4];
79 u16 rev;
80 int i;
81
82 for (i = 0; i < 4; i++) {
83#ifdef CONFIG_EISA_VLB_PRIMING
84 /*
85 * This ugly stuff is used to wake up VL-bus cards
86 * (AHA-284x is the only known example), so we can
87 * read the EISA id.
88 *
89 * Thankfully, this only exists on x86...
90 */
91 outb(0x80 + i, addr);
92#endif
93 sig[i] = inb(addr + i);
94
95 if (!i && (sig[0] & 0x80))
96 return NULL;
97 }
98
99 sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
100 sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
101 sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
102 rev = (sig[2] << 8) | sig[3];
103 sprintf(sig_str + 3, "%04X", rev);
104
105 return sig_str;
106}
107
108static int eisa_bus_match(struct device *dev, struct device_driver *drv)
109{
110 struct eisa_device *edev = to_eisa_device(dev);
111 struct eisa_driver *edrv = to_eisa_driver(drv);
112 const struct eisa_device_id *eids = edrv->id_table;
113
114 if (!eids)
115 return 0;
116
117 while (strlen(eids->sig)) {
118 if (!strcmp(eids->sig, edev->id.sig) &&
119 edev->state & EISA_CONFIG_ENABLED) {
120 edev->id.driver_data = eids->driver_data;
121 return 1;
122 }
123
124 eids++;
125 }
126
127 return 0;
128}
129
130static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
131{
132 struct eisa_device *edev = to_eisa_device(dev);
133
134 add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
135 return 0;
136}
137
138struct bus_type eisa_bus_type = {
139 .name = "eisa",
140 .match = eisa_bus_match,
141 .uevent = eisa_bus_uevent,
142};
143EXPORT_SYMBOL(eisa_bus_type);
144
145int eisa_driver_register(struct eisa_driver *edrv)
146{
147 edrv->driver.bus = &eisa_bus_type;
148 return driver_register(&edrv->driver);
149}
150EXPORT_SYMBOL(eisa_driver_register);
151
152void eisa_driver_unregister(struct eisa_driver *edrv)
153{
154 driver_unregister(&edrv->driver);
155}
156EXPORT_SYMBOL(eisa_driver_unregister);
157
158static ssize_t eisa_show_sig(struct device *dev, struct device_attribute *attr,
159 char *buf)
160{
161 struct eisa_device *edev = to_eisa_device(dev);
162 return sprintf(buf, "%s\n", edev->id.sig);
163}
164
165static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
166
167static ssize_t eisa_show_state(struct device *dev,
168 struct device_attribute *attr,
169 char *buf)
170{
171 struct eisa_device *edev = to_eisa_device(dev);
172 return sprintf(buf, "%d\n", edev->state & EISA_CONFIG_ENABLED);
173}
174
175static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
176
177static ssize_t eisa_show_modalias(struct device *dev,
178 struct device_attribute *attr,
179 char *buf)
180{
181 struct eisa_device *edev = to_eisa_device(dev);
182 return sprintf(buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
183}
184
185static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
186
187static int __init eisa_init_device(struct eisa_root_device *root,
188 struct eisa_device *edev,
189 int slot)
190{
191 char *sig;
192 unsigned long sig_addr;
193 int i;
194
195 sig_addr = SLOT_ADDRESS(root, slot) + EISA_VENDOR_ID_OFFSET;
196
197 sig = decode_eisa_sig(sig_addr);
198 if (!sig)
199 return -1; /* No EISA device here */
200
201 memcpy(edev->id.sig, sig, EISA_SIG_LEN);
202 edev->slot = slot;
203 edev->state = inb(SLOT_ADDRESS(root, slot) + EISA_CONFIG_OFFSET)
204 & EISA_CONFIG_ENABLED;
205 edev->base_addr = SLOT_ADDRESS(root, slot);
206 edev->dma_mask = root->dma_mask; /* Default DMA mask */
207 eisa_name_device(edev);
208 edev->dev.parent = root->dev;
209 edev->dev.bus = &eisa_bus_type;
210 edev->dev.dma_mask = &edev->dma_mask;
211 edev->dev.coherent_dma_mask = edev->dma_mask;
212 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
213
214 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
215#ifdef CONFIG_EISA_NAMES
216 edev->res[i].name = edev->pretty_name;
217#else
218 edev->res[i].name = edev->id.sig;
219#endif
220 }
221
222 if (is_forced_dev(enable_dev, enable_dev_count, root, edev))
223 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
224
225 if (is_forced_dev(disable_dev, disable_dev_count, root, edev))
226 edev->state = EISA_CONFIG_FORCED;
227
228 return 0;
229}
230
231static int __init eisa_register_device(struct eisa_device *edev)
232{
233 int rc = device_register(&edev->dev);
234 if (rc) {
235 put_device(&edev->dev);
236 return rc;
237 }
238
239 rc = device_create_file(&edev->dev, &dev_attr_signature);
240 if (rc)
241 goto err_devreg;
242 rc = device_create_file(&edev->dev, &dev_attr_enabled);
243 if (rc)
244 goto err_sig;
245 rc = device_create_file(&edev->dev, &dev_attr_modalias);
246 if (rc)
247 goto err_enab;
248
249 return 0;
250
251err_enab:
252 device_remove_file(&edev->dev, &dev_attr_enabled);
253err_sig:
254 device_remove_file(&edev->dev, &dev_attr_signature);
255err_devreg:
256 device_unregister(&edev->dev);
257 return rc;
258}
259
260static int __init eisa_request_resources(struct eisa_root_device *root,
261 struct eisa_device *edev,
262 int slot)
263{
264 int i;
265
266 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
267 /* Don't register resource for slot 0, since this is
268 * very likely to fail... :-( Instead, grab the EISA
269 * id, now we can display something in /proc/ioports.
270 */
271
272 /* Only one region for mainboard */
273 if (!slot && i > 0) {
274 edev->res[i].start = edev->res[i].end = 0;
275 continue;
276 }
277
278 if (slot) {
279 edev->res[i].name = NULL;
280 edev->res[i].start = SLOT_ADDRESS(root, slot)
281 + (i * 0x400);
282 edev->res[i].end = edev->res[i].start + 0xff;
283 edev->res[i].flags = IORESOURCE_IO;
284 } else {
285 edev->res[i].name = NULL;
286 edev->res[i].start = SLOT_ADDRESS(root, slot)
287 + EISA_VENDOR_ID_OFFSET;
288 edev->res[i].end = edev->res[i].start + 3;
289 edev->res[i].flags = IORESOURCE_IO | IORESOURCE_BUSY;
290 }
291
292 if (request_resource(root->res, &edev->res[i]))
293 goto failed;
294 }
295
296 return 0;
297
298 failed:
299 while (--i >= 0)
300 release_resource(&edev->res[i]);
301
302 return -1;
303}
304
305static void __init eisa_release_resources(struct eisa_device *edev)
306{
307 int i;
308
309 for (i = 0; i < EISA_MAX_RESOURCES; i++)
310 if (edev->res[i].start || edev->res[i].end)
311 release_resource(&edev->res[i]);
312}
313
314static int __init eisa_probe(struct eisa_root_device *root)
315{
316 int i, c;
317 struct eisa_device *edev;
318 char *enabled_str;
319
320 dev_info(root->dev, "Probing EISA bus %d\n", root->bus_nr);
321
322 /* First try to get hold of slot 0. If there is no device
323 * here, simply fail, unless root->force_probe is set. */
324
325 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
326 if (!edev)
327 return -ENOMEM;
328
329 if (eisa_request_resources(root, edev, 0)) {
330 dev_warn(root->dev,
331 "EISA: Cannot allocate resource for mainboard\n");
332 kfree(edev);
333 if (!root->force_probe)
334 return -EBUSY;
335 goto force_probe;
336 }
337
338 if (eisa_init_device(root, edev, 0)) {
339 eisa_release_resources(edev);
340 kfree(edev);
341 if (!root->force_probe)
342 return -ENODEV;
343 goto force_probe;
344 }
345
346 dev_info(&edev->dev, "EISA: Mainboard %s detected\n", edev->id.sig);
347
348 if (eisa_register_device(edev)) {
349 dev_err(&edev->dev, "EISA: Failed to register %s\n",
350 edev->id.sig);
351 eisa_release_resources(edev);
352 kfree(edev);
353 }
354
355 force_probe:
356
357 for (c = 0, i = 1; i <= root->slots; i++) {
358 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
359 if (!edev) {
360 dev_err(root->dev, "EISA: Out of memory for slot %d\n",
361 i);
362 continue;
363 }
364
365 if (eisa_request_resources(root, edev, i)) {
366 dev_warn(root->dev,
367 "Cannot allocate resource for EISA slot %d\n",
368 i);
369 kfree(edev);
370 continue;
371 }
372
373 if (eisa_init_device(root, edev, i)) {
374 eisa_release_resources(edev);
375 kfree(edev);
376 continue;
377 }
378
379 if (edev->state == (EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED))
380 enabled_str = " (forced enabled)";
381 else if (edev->state == EISA_CONFIG_FORCED)
382 enabled_str = " (forced disabled)";
383 else if (edev->state == 0)
384 enabled_str = " (disabled)";
385 else
386 enabled_str = "";
387
388 dev_info(&edev->dev, "EISA: slot %d: %s detected%s\n", i,
389 edev->id.sig, enabled_str);
390
391 c++;
392
393 if (eisa_register_device(edev)) {
394 dev_err(&edev->dev, "EISA: Failed to register %s\n",
395 edev->id.sig);
396 eisa_release_resources(edev);
397 kfree(edev);
398 }
399 }
400
401 dev_info(root->dev, "EISA: Detected %d card%s\n", c, c == 1 ? "" : "s");
402 return 0;
403}
404
405static struct resource eisa_root_res = {
406 .name = "EISA root resource",
407 .start = 0,
408 .end = 0xffffffff,
409 .flags = IORESOURCE_IO,
410};
411
412static int eisa_bus_count;
413
414int __init eisa_root_register(struct eisa_root_device *root)
415{
416 int err;
417
418 /* Use our own resources to check if this bus base address has
419 * been already registered. This prevents the virtual root
420 * device from registering after the real one has, for
421 * example... */
422
423 root->eisa_root_res.name = eisa_root_res.name;
424 root->eisa_root_res.start = root->res->start;
425 root->eisa_root_res.end = root->res->end;
426 root->eisa_root_res.flags = IORESOURCE_BUSY;
427
428 err = request_resource(&eisa_root_res, &root->eisa_root_res);
429 if (err)
430 return err;
431
432 root->bus_nr = eisa_bus_count++;
433
434 err = eisa_probe(root);
435 if (err)
436 release_resource(&root->eisa_root_res);
437
438 return err;
439}
440
441static int __init eisa_init(void)
442{
443 int r;
444
445 r = bus_register(&eisa_bus_type);
446 if (r)
447 return r;
448
449 printk(KERN_INFO "EISA bus registered\n");
450 return 0;
451}
452
453module_param_array(enable_dev, int, &enable_dev_count, 0444);
454module_param_array(disable_dev, int, &disable_dev_count, 0444);
455
456postcore_initcall(eisa_init);
457
458int EISA_bus; /* for legacy drivers */
459EXPORT_SYMBOL(EISA_bus);