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.
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>
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[] = {
32 #define EISA_INFOS (sizeof (eisa_table) / (sizeof (struct eisa_device_info)))
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,
44 struct eisa_root_device *root,
45 struct eisa_device *edev)
49 for (i = 0; i < forced_count; i++) {
50 x = (root->bus_nr << 8) | edev->slot;
51 if (forced_tab[i] == x)
58 static void __init eisa_name_device (struct eisa_device *edev)
60 #ifdef CONFIG_EISA_NAMES
62 for (i = 0; i < EISA_INFOS; i++) {
63 if (!strcmp (edev->id.sig, eisa_table[i].id.sig)) {
64 strlcpy (edev->pretty_name,
71 /* No name was found */
72 sprintf (edev->pretty_name, "EISA device %.7s", edev->id.sig);
76 static char __init *decode_eisa_sig(unsigned long addr)
78 static char sig_str[EISA_SIG_LEN];
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
90 * Thankfully, this only exists on x86...
94 sig[i] = inb (addr + i);
96 if (!i && (sig[0] & 0x80))
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);
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;
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;
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);
138 add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
139 "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
144 struct bus_type eisa_bus_type = {
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,
190 unsigned long sig_addr;
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);
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;
214 edev->res[i].name = edev->id.sig;
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;
227 static int __init eisa_register_device (struct eisa_device *edev)
229 int rc = device_register (&edev->dev);
233 rc = device_create_file (&edev->dev, &dev_attr_signature);
234 if (rc) goto err_devreg;
235 rc = device_create_file (&edev->dev, &dev_attr_enabled);
236 if (rc) goto err_sig;
237 rc = device_create_file (&edev->dev, &dev_attr_modalias);
238 if (rc) goto err_enab;
243 device_remove_file (&edev->dev, &dev_attr_enabled);
245 device_remove_file (&edev->dev, &dev_attr_signature);
247 device_unregister(&edev->dev);
251 static int __init eisa_request_resources (struct eisa_root_device *root,
252 struct eisa_device *edev,
257 for (i = 0; i < EISA_MAX_RESOURCES; i++) {
258 /* Don't register resource for slot 0, since this is
259 * very likely to fail... :-( Instead, grab the EISA
260 * id, now we can display something in /proc/ioports.
263 /* Only one region for mainboard */
264 if (!slot && i > 0) {
265 edev->res[i].start = edev->res[i].end = 0;
270 edev->res[i].name = NULL;
271 edev->res[i].start = SLOT_ADDRESS (root, slot) + (i * 0x400);
272 edev->res[i].end = edev->res[i].start + 0xff;
273 edev->res[i].flags = IORESOURCE_IO;
275 edev->res[i].name = NULL;
276 edev->res[i].start = SLOT_ADDRESS (root, slot) + EISA_VENDOR_ID_OFFSET;
277 edev->res[i].end = edev->res[i].start + 3;
278 edev->res[i].flags = IORESOURCE_BUSY;
281 if (request_resource (root->res, &edev->res[i]))
289 release_resource (&edev->res[i]);
294 static void __init eisa_release_resources (struct eisa_device *edev)
298 for (i = 0; i < EISA_MAX_RESOURCES; i++)
299 if (edev->res[i].start || edev->res[i].end)
300 release_resource (&edev->res[i]);
303 static int __init eisa_probe (struct eisa_root_device *root)
306 struct eisa_device *edev;
308 printk (KERN_INFO "EISA: Probing bus %d at %s\n",
309 root->bus_nr, root->dev->bus_id);
311 /* First try to get hold of slot 0. If there is no device
312 * here, simply fail, unless root->force_probe is set. */
314 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
315 printk (KERN_ERR "EISA: Couldn't allocate mainboard slot\n");
319 if (eisa_request_resources (root, edev, 0)) {
320 printk (KERN_WARNING \
321 "EISA: Cannot allocate resource for mainboard\n");
323 if (!root->force_probe)
328 if (eisa_init_device (root, edev, 0)) {
329 eisa_release_resources (edev);
331 if (!root->force_probe)
336 printk (KERN_INFO "EISA: Mainboard %s detected.\n", edev->id.sig);
338 if (eisa_register_device (edev)) {
339 printk (KERN_ERR "EISA: Failed to register %s\n",
341 eisa_release_resources (edev);
347 for (c = 0, i = 1; i <= root->slots; i++) {
348 if (!(edev = kzalloc (sizeof (*edev), GFP_KERNEL))) {
349 printk (KERN_ERR "EISA: Out of memory for slot %d\n",
354 if (eisa_request_resources (root, edev, i)) {
355 printk (KERN_WARNING \
356 "Cannot allocate resource for EISA slot %d\n",
362 if (eisa_init_device (root, edev, i)) {
363 eisa_release_resources (edev);
368 printk (KERN_INFO "EISA: slot %d : %s detected",
371 switch (edev->state) {
372 case EISA_CONFIG_ENABLED | EISA_CONFIG_FORCED:
373 printk (" (forced enabled)");
376 case EISA_CONFIG_FORCED:
377 printk (" (forced disabled)");
381 printk (" (disabled)");
389 if (eisa_register_device (edev)) {
390 printk (KERN_ERR "EISA: Failed to register %s\n",
392 eisa_release_resources (edev);
397 printk (KERN_INFO "EISA: Detected %d card%s.\n", c, c == 1 ? "" : "s");
402 static struct resource eisa_root_res = {
403 .name = "EISA root resource",
406 .flags = IORESOURCE_IO,
409 static int eisa_bus_count;
411 int __init eisa_root_register (struct eisa_root_device *root)
415 /* Use our own resources to check if this bus base address has
416 * been already registered. This prevents the virtual root
417 * device from registering after the real one has, for
420 root->eisa_root_res.name = eisa_root_res.name;
421 root->eisa_root_res.start = root->res->start;
422 root->eisa_root_res.end = root->res->end;
423 root->eisa_root_res.flags = IORESOURCE_BUSY;
425 if ((err = request_resource (&eisa_root_res, &root->eisa_root_res)))
428 root->bus_nr = eisa_bus_count++;
430 if ((err = eisa_probe (root)))
431 release_resource (&root->eisa_root_res);
436 static int __init eisa_init (void)
440 if ((r = bus_register (&eisa_bus_type)))
443 printk (KERN_INFO "EISA bus registered\n");
447 module_param_array(enable_dev, int, &enable_dev_count, 0444);
448 module_param_array(disable_dev, int, &disable_dev_count, 0444);
450 postcore_initcall (eisa_init);
452 int EISA_bus; /* for legacy drivers */
453 EXPORT_SYMBOL (EISA_bus);
454 EXPORT_SYMBOL (eisa_bus_type);
455 EXPORT_SYMBOL (eisa_driver_register);
456 EXPORT_SYMBOL (eisa_driver_unregister);