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Merge branch 'core-hweight-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.git] / drivers / eisa / eisa-bus.c
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
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
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
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
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
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
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
153 void eisa_driver_unregister(struct eisa_driver *edrv)
154 {
155         driver_unregister(&edrv->driver);
156 }
157 EXPORT_SYMBOL(eisa_driver_unregister);
158
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
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
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
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
232 static int __init eisa_register_device(struct eisa_device *edev)
233 {
234         int rc = device_register(&edev->dev);
235         if (rc)
236                 return rc;
237
238         rc = device_create_file(&edev->dev, &dev_attr_signature);
239         if (rc)
240                 goto err_devreg;
241         rc = device_create_file(&edev->dev, &dev_attr_enabled);
242         if (rc)
243                 goto err_sig;
244         rc = device_create_file(&edev->dev, &dev_attr_modalias);
245         if (rc)
246                 goto err_enab;
247
248         return 0;
249
250 err_enab:
251         device_remove_file(&edev->dev, &dev_attr_enabled);
252 err_sig:
253         device_remove_file(&edev->dev, &dev_attr_signature);
254 err_devreg:
255         device_unregister(&edev->dev);
256         return rc;
257 }
258
259 static int __init eisa_request_resources(struct eisa_root_device *root,
260                                          struct eisa_device *edev,
261                                          int slot)
262 {
263         int i;
264
265         for (i = 0; i < EISA_MAX_RESOURCES; i++) {
266                 /* Don't register resource for slot 0, since this is
267                  * very likely to fail... :-( Instead, grab the EISA
268                  * id, now we can display something in /proc/ioports.
269                  */
270
271                 /* Only one region for mainboard */
272                 if (!slot && i > 0) {
273                         edev->res[i].start = edev->res[i].end = 0;
274                         continue;
275                 }
276                 
277                 if (slot) {
278                         edev->res[i].name  = NULL;
279                         edev->res[i].start = SLOT_ADDRESS(root, slot)
280                                              + (i * 0x400);
281                         edev->res[i].end   = edev->res[i].start + 0xff;
282                         edev->res[i].flags = IORESOURCE_IO;
283                 } else {
284                         edev->res[i].name  = NULL;
285                         edev->res[i].start = SLOT_ADDRESS(root, slot)
286                                              + EISA_VENDOR_ID_OFFSET;
287                         edev->res[i].end   = edev->res[i].start + 3;
288                         edev->res[i].flags = IORESOURCE_BUSY;
289                 }
290
291                 if (request_resource(root->res, &edev->res[i]))
292                         goto failed;
293         }
294
295         return 0;
296         
297  failed:
298         while (--i >= 0)
299                 release_resource(&edev->res[i]);
300
301         return -1;
302 }
303
304 static void __init eisa_release_resources(struct eisa_device *edev)
305 {
306         int i;
307
308         for (i = 0; i < EISA_MAX_RESOURCES; i++)
309                 if (edev->res[i].start || edev->res[i].end)
310                         release_resource(&edev->res[i]);
311 }
312
313 static int __init eisa_probe(struct eisa_root_device *root)
314 {
315         int i, c;
316         struct eisa_device *edev;
317
318         printk(KERN_INFO "EISA: Probing bus %d at %s\n",
319                root->bus_nr, dev_name(root->dev));
320
321         /* First try to get hold of slot 0. If there is no device
322          * here, simply fail, unless root->force_probe is set. */
323         
324         edev = kzalloc(sizeof(*edev), GFP_KERNEL);
325         if (!edev) {
326                 printk(KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
327                 return -ENOMEM;
328         }
329                 
330         if (eisa_request_resources(root, edev, 0)) {
331                 printk(KERN_WARNING \
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         printk(KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
348
349         if (eisa_register_device(edev)) {
350                 printk(KERN_ERR "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                         printk(KERN_ERR "EISA: Out of memory for slot %d\n", i);
362                         continue;
363                 }
364
365                 if (eisa_request_resources(root, edev, i)) {
366                         printk(KERN_WARNING \
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                 printk(KERN_INFO "EISA: slot %d : %s detected",
380                        i, edev->id.sig);
381                         
382                 switch (edev->state) {
383                 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
384                         printk(" (forced enabled)");
385                         break;
386
387                 case EISA_CONFIG_FORCED:
388                         printk(" (forced disabled)");
389                         break;
390
391                 case 0:
392                         printk(" (disabled)");
393                         break;
394                 }
395                         
396                 printk (".\n");
397
398                 c++;
399
400                 if (eisa_register_device(edev)) {
401                         printk(KERN_ERR "EISA: Failed to register %s\n",
402                                edev->id.sig);
403                         eisa_release_resources(edev);
404                         kfree(edev);
405                 }
406         }
407
408         printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
409
410         return 0;
411 }
412
413 static struct resource eisa_root_res = {
414         .name  = "EISA root resource",
415         .start = 0,
416         .end   = 0xffffffff,
417         .flags = IORESOURCE_IO,
418 };
419
420 static int eisa_bus_count;
421
422 int __init eisa_root_register(struct eisa_root_device *root)
423 {
424         int err;
425
426         /* Use our own resources to check if this bus base address has
427          * been already registered. This prevents the virtual root
428          * device from registering after the real one has, for
429          * example... */
430         
431         root->eisa_root_res.name  = eisa_root_res.name;
432         root->eisa_root_res.start = root->res->start;
433         root->eisa_root_res.end   = root->res->end;
434         root->eisa_root_res.flags = IORESOURCE_BUSY;
435
436         err = request_resource(&eisa_root_res, &root->eisa_root_res);
437         if (err)
438                 return err;
439         
440         root->bus_nr = eisa_bus_count++;
441
442         err = eisa_probe(root);
443         if (err)
444                 release_resource(&root->eisa_root_res);
445
446         return err;
447 }
448
449 static int __init eisa_init(void)
450 {
451         int r;
452         
453         r = bus_register(&eisa_bus_type);
454         if (r)
455                 return r;
456
457         printk(KERN_INFO "EISA bus registered\n");
458         return 0;
459 }
460
461 module_param_array(enable_dev, int, &enable_dev_count, 0444);
462 module_param_array(disable_dev, int, &disable_dev_count, 0444);
463
464 postcore_initcall(eisa_init);
465
466 int EISA_bus;           /* for legacy drivers */
467 EXPORT_SYMBOL(EISA_bus);