tcp: Fix race in tcp_poll
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / eisa / eisa-bus.c
blob66958b3f10b426c3fcee2135a61087c4b50241bd
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[50];
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 unsigned int enable_dev_count;
39 static int disable_dev[EISA_MAX_FORCED_DEV];
40 static unsigned 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 sizeof(edev->pretty_name));
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, struct kobj_uevent_env *env)
133 struct eisa_device *edev = to_eisa_device(dev);
135 add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
136 return 0;
139 struct bus_type eisa_bus_type = {
140 .name = "eisa",
141 .match = eisa_bus_match,
142 .uevent = eisa_bus_uevent,
145 int eisa_driver_register (struct eisa_driver *edrv)
147 edrv->driver.bus = &eisa_bus_type;
148 return driver_register (&edrv->driver);
151 void eisa_driver_unregister (struct eisa_driver *edrv)
153 driver_unregister (&edrv->driver);
156 static ssize_t eisa_show_sig (struct device *dev, struct device_attribute *attr, char *buf)
158 struct eisa_device *edev = to_eisa_device (dev);
159 return sprintf (buf,"%s\n", edev->id.sig);
162 static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
164 static ssize_t eisa_show_state (struct device *dev, struct device_attribute *attr, char *buf)
166 struct eisa_device *edev = to_eisa_device (dev);
167 return sprintf (buf,"%d\n", edev->state & EISA_CONFIG_ENABLED);
170 static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
172 static ssize_t eisa_show_modalias (struct device *dev, struct device_attribute *attr, char *buf)
174 struct eisa_device *edev = to_eisa_device (dev);
175 return sprintf (buf, EISA_DEVICE_MODALIAS_FMT "\n", edev->id.sig);
178 static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
180 static int __init eisa_init_device (struct eisa_root_device *root,
181 struct eisa_device *edev,
182 int slot)
184 char *sig;
185 unsigned long sig_addr;
186 int i;
188 sig_addr = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
190 if (!(sig = decode_eisa_sig (sig_addr)))
191 return -1; /* No EISA device here */
193 memcpy (edev->id.sig, sig, EISA_SIG_LEN);
194 edev->slot = slot;
195 edev->state = inb (SLOT_ADDRESS (root, slot) + EISA_CONFIG_OFFSET) & EISA_CONFIG_ENABLED;
196 edev->base_addr = SLOT_ADDRESS (root, slot);
197 edev->dma_mask = root->dma_mask; /* Default DMA mask */
198 eisa_name_device (edev);
199 edev->dev.parent = root->dev;
200 edev->dev.bus = &eisa_bus_type;
201 edev->dev.dma_mask = &edev->dma_mask;
202 edev->dev.coherent_dma_mask = edev->dma_mask;
203 dev_set_name(&edev->dev, "%02X:%02X", root->bus_nr, slot);
205 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
206 #ifdef CONFIG_EISA_NAMES
207 edev->res[i].name = edev->pretty_name;
208 #else
209 edev->res[i].name = edev->id.sig;
210 #endif
213 if (is_forced_dev (enable_dev, enable_dev_count, root, edev))
214 edev->state = EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED;
216 if (is_forced_dev (disable_dev, disable_dev_count, root, edev))
217 edev->state = EISA_CONFIG_FORCED;
219 return 0;
222 static int __init eisa_register_device (struct eisa_device *edev)
224 int rc = device_register (&edev->dev);
225 if (rc)
226 return rc;
228 rc = device_create_file (&edev->dev, &dev_attr_signature);
229 if (rc) goto err_devreg;
230 rc = device_create_file (&edev->dev, &dev_attr_enabled);
231 if (rc) goto err_sig;
232 rc = device_create_file (&edev->dev, &dev_attr_modalias);
233 if (rc) goto err_enab;
235 return 0;
237 err_enab:
238 device_remove_file (&edev->dev, &dev_attr_enabled);
239 err_sig:
240 device_remove_file (&edev->dev, &dev_attr_signature);
241 err_devreg:
242 device_unregister(&edev->dev);
243 return rc;
246 static int __init eisa_request_resources (struct eisa_root_device *root,
247 struct eisa_device *edev,
248 int slot)
250 int i;
252 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
253 /* Don't register resource for slot 0, since this is
254 * very likely to fail... :-( Instead, grab the EISA
255 * id, now we can display something in /proc/ioports.
258 /* Only one region for mainboard */
259 if (!slot && i > 0) {
260 edev->res[i].start = edev->res[i].end = 0;
261 continue;
264 if (slot) {
265 edev->res[i].name = NULL;
266 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
267 edev->res[i].end = edev->res[i].start + 0xff;
268 edev->res[i].flags = IORESOURCE_IO;
269 } else {
270 edev->res[i].name = NULL;
271 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
272 edev->res[i].end = edev->res[i].start + 3;
273 edev->res[i].flags = IORESOURCE_BUSY;
276 if (request_resource (root->res, &edev->res[i]))
277 goto failed;
280 return 0;
282 failed:
283 while (--i >= 0)
284 release_resource (&edev->res[i]);
286 return -1;
289 static void __init eisa_release_resources (struct eisa_device *edev)
291 int i;
293 for (i = 0; i < EISA_MAX_RESOURCES; i++)
294 if (edev->res[i].start || edev->res[i].end)
295 release_resource (&edev->res[i]);
298 static int __init eisa_probe (struct eisa_root_device *root)
300 int i, c;
301 struct eisa_device *edev;
303 printk (KERN_INFO "EISA: Probing bus %d at %s\n",
304 root->bus_nr, dev_name(root->dev));
306 /* First try to get hold of slot 0. If there is no device
307 * here, simply fail, unless root->force_probe is set. */
309 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
310 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
311 return -ENOMEM;
314 if (eisa_request_resources (root, edev, 0)) {
315 printk (KERN_WARNING \
316 "EISA: Cannot allocate resource for mainboard\n");
317 kfree (edev);
318 if (!root->force_probe)
319 return -EBUSY;
320 goto force_probe;
323 if (eisa_init_device (root, edev, 0)) {
324 eisa_release_resources (edev);
325 kfree (edev);
326 if (!root->force_probe)
327 return -ENODEV;
328 goto force_probe;
331 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
333 if (eisa_register_device (edev)) {
334 printk (KERN_ERR "EISA: Failed to register %s\n",
335 edev->id.sig);
336 eisa_release_resources (edev);
337 kfree (edev);
340 force_probe:
342 for (c = 0, i = 1; i <= root->slots; i++) {
343 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
344 printk (KERN_ERR "EISA: Out of memory for slot %d\n",
346 continue;
349 if (eisa_request_resources (root, edev, i)) {
350 printk (KERN_WARNING \
351 "Cannot allocate resource for EISA slot %d\n",
353 kfree (edev);
354 continue;
357 if (eisa_init_device (root, edev, i)) {
358 eisa_release_resources (edev);
359 kfree (edev);
360 continue;
363 printk (KERN_INFO "EISA: slot %d : %s detected",
364 i, edev->id.sig);
366 switch (edev->state) {
367 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
368 printk (" (forced enabled)");
369 break;
371 case EISA_CONFIG_FORCED:
372 printk (" (forced disabled)");
373 break;
375 case 0:
376 printk (" (disabled)");
377 break;
380 printk (".\n");
382 c++;
384 if (eisa_register_device (edev)) {
385 printk (KERN_ERR "EISA: Failed to register %s\n",
386 edev->id.sig);
387 eisa_release_resources (edev);
388 kfree (edev);
392 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
394 return 0;
397 static struct resource eisa_root_res = {
398 .name = "EISA root resource",
399 .start = 0,
400 .end = 0xffffffff,
401 .flags = IORESOURCE_IO,
404 static int eisa_bus_count;
406 int __init eisa_root_register (struct eisa_root_device *root)
408 int err;
410 /* Use our own resources to check if this bus base address has
411 * been already registered. This prevents the virtual root
412 * device from registering after the real one has, for
413 * example... */
415 root->eisa_root_res.name = eisa_root_res.name;
416 root->eisa_root_res.start = root->res->start;
417 root->eisa_root_res.end = root->res->end;
418 root->eisa_root_res.flags = IORESOURCE_BUSY;
420 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
421 return err;
423 root->bus_nr = eisa_bus_count++;
425 if ((err = eisa_probe (root)))
426 release_resource (&root->eisa_root_res);
428 return err;
431 static int __init eisa_init (void)
433 int r;
435 if ((r = bus_register (&eisa_bus_type)))
436 return r;
438 printk (KERN_INFO "EISA bus registered\n");
439 return 0;
442 module_param_array(enable_dev, int, &enable_dev_count, 0444);
443 module_param_array(disable_dev, int, &disable_dev_count, 0444);
445 postcore_initcall (eisa_init);
447 int EISA_bus; /* for legacy drivers */
448 EXPORT_SYMBOL (EISA_bus);
449 EXPORT_SYMBOL (eisa_bus_type);
450 EXPORT_SYMBOL (eisa_driver_register);
451 EXPORT_SYMBOL (eisa_driver_unregister);