Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
[linux-2.6-microblaze.git] / drivers / eisa / eisa-bus.c
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
22 struct eisa_device_info {
23         struct eisa_device_id id;
24         char name[50];
25 };
26
27 #ifdef CONFIG_EISA_NAMES
28 static 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
36 static int enable_dev[EISA_MAX_FORCED_DEV];
37 static unsigned int enable_dev_count;
38 static int disable_dev[EISA_MAX_FORCED_DEV];
39 static unsigned int disable_dev_count;
40
41 static 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
57 static 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
75 static 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
108 static 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
130 static 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
138 struct bus_type eisa_bus_type = {
139         .name  = "eisa",
140         .match = eisa_bus_match,
141         .uevent = eisa_bus_uevent,
142 };
143 EXPORT_SYMBOL(eisa_bus_type);
144
145 int eisa_driver_register(struct eisa_driver *edrv)
146 {
147         edrv->driver.bus = &eisa_bus_type;
148         return driver_register(&edrv->driver);
149 }
150 EXPORT_SYMBOL(eisa_driver_register);
151
152 void eisa_driver_unregister(struct eisa_driver *edrv)
153 {
154         driver_unregister(&edrv->driver);
155 }
156 EXPORT_SYMBOL(eisa_driver_unregister);
157
158 static 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
165 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
166
167 static 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
175 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
176
177 static 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
185 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
186
187 static 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
231 static 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
251 err_enab:
252         device_remove_file(&edev->dev, &dev_attr_enabled);
253 err_sig:
254         device_remove_file(&edev->dev, &dev_attr_signature);
255 err_devreg:
256         device_unregister(&edev->dev);
257         return rc;
258 }
259
260 static 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
305 static 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
314 static 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
405 static struct resource eisa_root_res = {
406         .name  = "EISA root resource",
407         .start = 0,
408         .end   = 0xffffffff,
409         .flags = IORESOURCE_IO,
410 };
411
412 static int eisa_bus_count;
413
414 int __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
441 static 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
453 module_param_array(enable_dev, int, &enable_dev_count, 0444);
454 module_param_array(disable_dev, int, &disable_dev_count, 0444);
455
456 postcore_initcall(eisa_init);
457
458 int EISA_bus;           /* for legacy drivers */
459 EXPORT_SYMBOL(EISA_bus);