Root/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
23struct eisa_device_info {
24    struct eisa_device_id id;
25    char name[50];
26};
27
28#ifdef CONFIG_EISA_NAMES
29static 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
37static int enable_dev[EISA_MAX_FORCED_DEV];
38static unsigned int enable_dev_count;
39static int disable_dev[EISA_MAX_FORCED_DEV];
40static unsigned int disable_dev_count;
41
42static 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
58static 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
76static 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
109static 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
131static 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
139struct bus_type eisa_bus_type = {
140    .name = "eisa",
141    .match = eisa_bus_match,
142    .uevent = eisa_bus_uevent,
143};
144EXPORT_SYMBOL(eisa_bus_type);
145
146int eisa_driver_register(struct eisa_driver *edrv)
147{
148    edrv->driver.bus = &eisa_bus_type;
149    return driver_register(&edrv->driver);
150}
151EXPORT_SYMBOL(eisa_driver_register);
152
153void eisa_driver_unregister(struct eisa_driver *edrv)
154{
155    driver_unregister(&edrv->driver);
156}
157EXPORT_SYMBOL(eisa_driver_unregister);
158
159static 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
166static DEVICE_ATTR(signature, S_IRUGO, eisa_show_sig, NULL);
167
168static 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
176static DEVICE_ATTR(enabled, S_IRUGO, eisa_show_state, NULL);
177
178static 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
186static DEVICE_ATTR(modalias, S_IRUGO, eisa_show_modalias, NULL);
187
188static 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
232static 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
250err_enab:
251    device_remove_file(&edev->dev, &dev_attr_enabled);
252err_sig:
253    device_remove_file(&edev->dev, &dev_attr_signature);
254err_devreg:
255    device_unregister(&edev->dev);
256    return rc;
257}
258
259static 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
304static 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
313static 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
413static struct resource eisa_root_res = {
414    .name = "EISA root resource",
415    .start = 0,
416    .end = 0xffffffff,
417    .flags = IORESOURCE_IO,
418};
419
420static int eisa_bus_count;
421
422int __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
449static 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
461module_param_array(enable_dev, int, &enable_dev_count, 0444);
462module_param_array(disable_dev, int, &disable_dev_count, 0444);
463
464postcore_initcall(eisa_init);
465
466int EISA_bus; /* for legacy drivers */
467EXPORT_SYMBOL(EISA_bus);
468

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