[MIPS] Stacktrace build-fix and improvement
[linux-2.6/linux-mips.git] / drivers / eisa / eisa-bus.c
blob3a365e159d89d52df59b945d22bb7bd1408022f9
1 /*
2 * EISA bus support functions for sysfs.
4 * (C) 2002, 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
6 * This code is released under the GPL version 2.
7 */
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>
19 #define SLOT_ADDRESS(r,n) (r->bus_base_addr + (0x1000 * n))
21 #define EISA_DEVINFO(i,s) { .id = { .sig = i }, .name = s }
23 struct eisa_device_info {
24 struct eisa_device_id id;
25 char name[DEVICE_NAME_SIZE];
28 #ifdef CONFIG_EISA_NAMES
29 static struct eisa_device_info __initdata eisa_table[] = {
30 #include "devlist.h"
32 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
33 #endif
35 #define EISA_MAX_FORCED_DEV 16
37 static int enable_dev[EISA_MAX_FORCED_DEV];
38 static int enable_dev_count;
39 static int disable_dev[EISA_MAX_FORCED_DEV];
40 static int disable_dev_count;
42 static int is_forced_dev (int *forced_tab,
43 int forced_count,
44 struct eisa_root_device *root,
45 struct eisa_device *edev)
47 int i, x;
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;
55 return 0;
58 static void __init eisa_name_device (struct eisa_device *edev)
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;
71 /* No name was found */
72 sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
73 #endif
76 static char __init *decode_eisa_sig(unsigned long addr)
78 static char sig_str[EISA_SIG_LEN];
79 u8 sig[4];
80 u16 rev;
81 int i;
83 for (i = 0; i < 4; i++) {
84 #ifdef CONFIG_EISA_VLB_PRIMING
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.
90 * Thankfully, this only exists on x86...
92 outb(0x80 + i, addr);
93 #endif
94 sig[i] = inb (addr + i);
96 if (!i && (sig[0] & 0x80))
97 return NULL;
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);
106 return sig_str;
109 static int eisa_bus_match (struct device *dev, struct device_driver *drv)
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;
115 if (!eids)
116 return 0;
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;
125 eids++;
128 return 0;
131 static int eisa_bus_uevent(struct device *dev, char **envp, int num_envp,
132 char *buffer, int buffer_size)
134 struct eisa_device *edev = to_eisa_device(dev);
135 int i = 0;
136 int length = 0;
138 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
139 "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
140 envp[i] = NULL;
141 return 0;
144 struct bus_type eisa_bus_type = {
145 .name = "eisa",
146 .match = eisa_bus_match,
147 .uevent = eisa_bus_uevent,
150 int eisa_driver_register (struct eisa_driver *edrv)
152 edrv->driver.bus = &eisa_bus_type;
153 return driver_register (&edrv->driver);
156 void eisa_driver_unregister (struct eisa_driver *edrv)
158 driver_unregister (&edrv->driver);
161 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
163 struct eisa_device *edev = to_eisa_device (dev);
164 return sprintf (buf,"%s\n", edev->id.sig);
167 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
169 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
171 struct eisa_device *edev = to_eisa_device (dev);
172 return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
175 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
177 static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf)
179 struct eisa_device *edev = to_eisa_device (dev);
180 return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
183 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
185 static int __init eisa_init_device (struct eisa_root_device *root,
186 struct eisa_device *edev,
187 int slot)
189 char *sig;
190 unsigned long sig_addr;
191 int i;
193 sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
195 if (!(sig = decode_eisa_sig (sig_addr)))
196 return -1; /* No EISA device here */
198 memcpy (edev->id.sig, sig, EISA_SIG_LEN);
199 edev->slot = slot;
200 edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
201 edev->base_addr = SLOT_ADDRESS (root, slot);
202 edev->dma_mask = root->dma_mask; /* Default DMA mask */
203 eisa_name_device (edev);
204 edev->dev.parent = root->dev;
205 edev->dev.bus = &eisa_bus_type;
206 edev->dev.dma_mask = &edev->dma_mask;
207 edev->dev.coherent_dma_mask = edev->dma_mask;
208 sprintf (edev->dev.bus_id, "%02X:%02X", root->bus_nr, slot);
210 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
211 #ifdef CONFIG_EISA_NAMES
212 edev->res[i].name = edev->pretty_name;
213 #else
214 edev->res[i].name = edev->id.sig;
215 #endif
218 if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
219 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
221 if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
222 edev->state = EISA_CONFIG_FORCED;
224 return 0;
227 static int __init eisa_register_device (struct eisa_device *edev)
229 if (device_register (&edev->dev))
230 return -1;
232 device_create_file (&edev->dev, &dev_attr_signature);
233 device_create_file (&edev->dev, &dev_attr_enabled);
234 device_create_file (&edev->dev, &dev_attr_modalias);
236 return 0;
239 static int __init eisa_request_resources (struct eisa_root_device *root,
240 struct eisa_device *edev,
241 int slot)
243 int i;
245 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
246 /* Don't register resource for slot 0, since this is
247 * very likely to fail... :-( Instead, grab the EISA
248 * id, now we can display something in /proc/ioports.
251 /* Only one region for mainboard */
252 if (!slot && i > 0) {
253 edev->res[i].start = edev->res[i].end = 0;
254 continue;
257 if (slot) {
258 edev->res[i].name = NULL;
259 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
260 edev->res[i].end = edev->res[i].start + 0xff;
261 edev->res[i].flags = IORESOURCE_IO;
262 } else {
263 edev->res[i].name = NULL;
264 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
265 edev->res[i].end = edev->res[i].start + 3;
266 edev->res[i].flags = IORESOURCE_BUSY;
269 if (request_resource (root->res, &edev->res[i]))
270 goto failed;
273 return 0;
275 failed:
276 while (--i >= 0)
277 release_resource (&edev->res[i]);
279 return -1;
282 static void __init eisa_release_resources (struct eisa_device *edev)
284 int i;
286 for (i = 0; i < EISA_MAX_RESOURCES; i++)
287 if (edev->res[i].start || edev->res[i].end)
288 release_resource (&edev->res[i]);
291 static int __init eisa_probe (struct eisa_root_device *root)
293 int i, c;
294 struct eisa_device *edev;
296 printk (KERN_INFO "EISA: Probing bus %d at %s\n",
297 root->bus_nr, root->dev->bus_id);
299 /* First try to get hold of slot 0. If there is no device
300 * here, simply fail, unless root->force_probe is set. */
302 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
303 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
304 return -ENOMEM;
307 if (eisa_request_resources (root, edev, 0)) {
308 printk (KERN_WARNING \
309 "EISA: Cannot allocate resource for mainboard\n");
310 kfree (edev);
311 if (!root->force_probe)
312 return -EBUSY;
313 goto force_probe;
316 if (eisa_init_device (root, edev, 0)) {
317 eisa_release_resources (edev);
318 kfree (edev);
319 if (!root->force_probe)
320 return -ENODEV;
321 goto force_probe;
324 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
326 if (eisa_register_device (edev)) {
327 printk (KERN_ERR "EISA: Failed to register %s\n",
328 edev->id.sig);
329 eisa_release_resources (edev);
330 kfree (edev);
333 force_probe:
335 for (c = 0, i = 1; i <= root->slots; i++) {
336 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
337 printk (KERN_ERR "EISA: Out of memory for slot %d\n",
339 continue;
342 if (eisa_request_resources (root, edev, i)) {
343 printk (KERN_WARNING \
344 "Cannot allocate resource for EISA slot %d\n",
346 kfree (edev);
347 continue;
350 if (eisa_init_device (root, edev, i)) {
351 eisa_release_resources (edev);
352 kfree (edev);
353 continue;
356 printk (KERN_INFO "EISA: slot %d : %s detected",
357 i, edev->id.sig);
359 switch (edev->state) {
360 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
361 printk (" (forced enabled)");
362 break;
364 case EISA_CONFIG_FORCED:
365 printk (" (forced disabled)");
366 break;
368 case 0:
369 printk (" (disabled)");
370 break;
373 printk (".\n");
375 c++;
377 if (eisa_register_device (edev)) {
378 printk (KERN_ERR "EISA: Failed to register %s\n",
379 edev->id.sig);
380 eisa_release_resources (edev);
381 kfree (edev);
385 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
387 return 0;
390 static struct resource eisa_root_res = {
391 .name = "EISA root resource",
392 .start = 0,
393 .end = 0xffffffff,
394 .flags = IORESOURCE_IO,
397 static int eisa_bus_count;
399 int __init eisa_root_register (struct eisa_root_device *root)
401 int err;
403 /* Use our own resources to check if this bus base address has
404 * been already registered. This prevents the virtual root
405 * device from registering after the real one has, for
406 * example... */
408 root->eisa_root_res.name = eisa_root_res.name;
409 root->eisa_root_res.start = root->res->start;
410 root->eisa_root_res.end = root->res->end;
411 root->eisa_root_res.flags = IORESOURCE_BUSY;
413 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
414 return err;
416 root->bus_nr = eisa_bus_count++;
418 if ((err = eisa_probe (root)))
419 release_resource (&root->eisa_root_res);
421 return err;
424 static int __init eisa_init (void)
426 int r;
428 if ((r = bus_register (&eisa_bus_type)))
429 return r;
431 printk (KERN_INFO "EISA bus registered\n");
432 return 0;
435 module_param_array(enable_dev, int, &enable_dev_count, 0444);
436 module_param_array(disable_dev, int, &disable_dev_count, 0444);
438 postcore_initcall (eisa_init);
440 int EISA_bus; /* for legacy drivers */
441 EXPORT_SYMBOL (EISA_bus);
442 EXPORT_SYMBOL (eisa_bus_type);
443 EXPORT_SYMBOL (eisa_driver_register);
444 EXPORT_SYMBOL (eisa_driver_unregister);