[SCSI] open-iscsi/linux-iscsi-5 Initiator: Transport class update for iSCSI
[linux-2.6] / drivers / pnp / manager.c
1 /*
2  * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
3  *
4  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6  *
7  */
8
9 #include <linux/config.h>
10 #include <linux/errno.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14
15 #ifdef CONFIG_PNP_DEBUG
16         #define DEBUG
17 #else
18         #undef DEBUG
19 #endif
20
21 #include <linux/pnp.h>
22 #include "base.h"
23
24 DECLARE_MUTEX(pnp_res_mutex);
25
26 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
27 {
28         unsigned long *start, *end, *flags;
29
30         if (!dev || !rule)
31                 return -EINVAL;
32
33         if (idx >= PNP_MAX_PORT) {
34                 pnp_err("More than 4 ports is incompatible with pnp specifications.");
35                 /* pretend we were successful so at least the manager won't try again */
36                 return 1;
37         }
38
39         /* check if this resource has been manually set, if so skip */
40         if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
41                 return 1;
42
43         start = &dev->res.port_resource[idx].start;
44         end = &dev->res.port_resource[idx].end;
45         flags = &dev->res.port_resource[idx].flags;
46
47         /* set the initial values */
48         *flags |= rule->flags | IORESOURCE_IO;
49         *flags &=  ~IORESOURCE_UNSET;
50
51         if (!rule->size) {
52                 *flags |= IORESOURCE_DISABLED;
53                 return 1; /* skip disabled resource requests */
54         }
55
56         *start = rule->min;
57         *end = *start + rule->size - 1;
58
59         /* run through until pnp_check_port is happy */
60         while (!pnp_check_port(dev, idx)) {
61                 *start += rule->align;
62                 *end = *start + rule->size - 1;
63                 if (*start > rule->max || !rule->align)
64                         return 0;
65         }
66         return 1;
67 }
68
69 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
70 {
71         unsigned long *start, *end, *flags;
72
73         if (!dev || !rule)
74                 return -EINVAL;
75
76         if (idx >= PNP_MAX_MEM) {
77                 pnp_err("More than 8 mems is incompatible with pnp specifications.");
78                 /* pretend we were successful so at least the manager won't try again */
79                 return 1;
80         }
81
82         /* check if this resource has been manually set, if so skip */
83         if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
84                 return 1;
85
86         start = &dev->res.mem_resource[idx].start;
87         end = &dev->res.mem_resource[idx].end;
88         flags = &dev->res.mem_resource[idx].flags;
89
90         /* set the initial values */
91         *flags |= rule->flags | IORESOURCE_MEM;
92         *flags &=  ~IORESOURCE_UNSET;
93
94         /* convert pnp flags to standard Linux flags */
95         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
96                 *flags |= IORESOURCE_READONLY;
97         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
98                 *flags |= IORESOURCE_CACHEABLE;
99         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
100                 *flags |= IORESOURCE_RANGELENGTH;
101         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
102                 *flags |= IORESOURCE_SHADOWABLE;
103
104         if (!rule->size) {
105                 *flags |= IORESOURCE_DISABLED;
106                 return 1; /* skip disabled resource requests */
107         }
108
109         *start = rule->min;
110         *end = *start + rule->size -1;
111
112         /* run through until pnp_check_mem is happy */
113         while (!pnp_check_mem(dev, idx)) {
114                 *start += rule->align;
115                 *end = *start + rule->size - 1;
116                 if (*start > rule->max || !rule->align)
117                         return 0;
118         }
119         return 1;
120 }
121
122 static int pnp_assign_irq(struct pnp_dev * dev, struct pnp_irq *rule, int idx)
123 {
124         unsigned long *start, *end, *flags;
125         int i;
126
127         /* IRQ priority: this table is good for i386 */
128         static unsigned short xtab[16] = {
129                 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
130         };
131
132         if (!dev || !rule)
133                 return -EINVAL;
134
135         if (idx >= PNP_MAX_IRQ) {
136                 pnp_err("More than 2 irqs is incompatible with pnp specifications.");
137                 /* pretend we were successful so at least the manager won't try again */
138                 return 1;
139         }
140
141         /* check if this resource has been manually set, if so skip */
142         if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
143                 return 1;
144
145         start = &dev->res.irq_resource[idx].start;
146         end = &dev->res.irq_resource[idx].end;
147         flags = &dev->res.irq_resource[idx].flags;
148
149         /* set the initial values */
150         *flags |= rule->flags | IORESOURCE_IRQ;
151         *flags &=  ~IORESOURCE_UNSET;
152
153         if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
154                 *flags |= IORESOURCE_DISABLED;
155                 return 1; /* skip disabled resource requests */
156         }
157
158         /* TBD: need check for >16 IRQ */
159         *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
160         if (*start < PNP_IRQ_NR) {
161                 *end = *start;
162                 return 1;
163         }
164         for (i = 0; i < 16; i++) {
165                 if(test_bit(xtab[i], rule->map)) {
166                         *start = *end = xtab[i];
167                         if(pnp_check_irq(dev, idx))
168                                 return 1;
169                 }
170         }
171         return 0;
172 }
173
174 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
175 {
176         unsigned long *start, *end, *flags;
177         int i;
178
179         /* DMA priority: this table is good for i386 */
180         static unsigned short xtab[8] = {
181                 1, 3, 5, 6, 7, 0, 2, 4
182         };
183
184         if (!dev || !rule)
185                 return -EINVAL;
186
187         if (idx >= PNP_MAX_DMA) {
188                 pnp_err("More than 2 dmas is incompatible with pnp specifications.");
189                 /* pretend we were successful so at least the manager won't try again */
190                 return 1;
191         }
192
193         /* check if this resource has been manually set, if so skip */
194         if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
195                 return 1;
196
197         start = &dev->res.dma_resource[idx].start;
198         end = &dev->res.dma_resource[idx].end;
199         flags = &dev->res.dma_resource[idx].flags;
200
201         /* set the initial values */
202         *flags |= rule->flags | IORESOURCE_DMA;
203         *flags &=  ~IORESOURCE_UNSET;
204
205         if (!rule->map) {
206                 *flags |= IORESOURCE_DISABLED;
207                 return 1; /* skip disabled resource requests */
208         }
209
210         for (i = 0; i < 8; i++) {
211                 if(rule->map & (1<<xtab[i])) {
212                         *start = *end = xtab[i];
213                         if(pnp_check_dma(dev, idx))
214                                 return 1;
215                 }
216         }
217         return 0;
218 }
219
220 /**
221  * pnp_init_resources - Resets a resource table to default values.
222  * @table: pointer to the desired resource table
223  *
224  */
225 void pnp_init_resource_table(struct pnp_resource_table *table)
226 {
227         int idx;
228         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
229                 table->irq_resource[idx].name = NULL;
230                 table->irq_resource[idx].start = -1;
231                 table->irq_resource[idx].end = -1;
232                 table->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
233         }
234         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
235                 table->dma_resource[idx].name = NULL;
236                 table->dma_resource[idx].start = -1;
237                 table->dma_resource[idx].end = -1;
238                 table->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
239         }
240         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
241                 table->port_resource[idx].name = NULL;
242                 table->port_resource[idx].start = 0;
243                 table->port_resource[idx].end = 0;
244                 table->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
245         }
246         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
247                 table->mem_resource[idx].name = NULL;
248                 table->mem_resource[idx].start = 0;
249                 table->mem_resource[idx].end = 0;
250                 table->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
251         }
252 }
253
254 /**
255  * pnp_clean_resources - clears resources that were not manually set
256  * @res: the resources to clean
257  *
258  */
259 static void pnp_clean_resource_table(struct pnp_resource_table * res)
260 {
261         int idx;
262         for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
263                 if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
264                         continue;
265                 res->irq_resource[idx].start = -1;
266                 res->irq_resource[idx].end = -1;
267                 res->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
268         }
269         for (idx = 0; idx < PNP_MAX_DMA; idx++) {
270                 if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
271                         continue;
272                 res->dma_resource[idx].start = -1;
273                 res->dma_resource[idx].end = -1;
274                 res->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
275         }
276         for (idx = 0; idx < PNP_MAX_PORT; idx++) {
277                 if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
278                         continue;
279                 res->port_resource[idx].start = 0;
280                 res->port_resource[idx].end = 0;
281                 res->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
282         }
283         for (idx = 0; idx < PNP_MAX_MEM; idx++) {
284                 if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
285                         continue;
286                 res->mem_resource[idx].start = 0;
287                 res->mem_resource[idx].end = 0;
288                 res->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
289         }
290 }
291
292 /**
293  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
294  * @dev: pointer to the desired device
295  * @depnum: the dependent function number
296  *
297  * Only set depnum to 0 if the device does not have dependent options.
298  */
299 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
300 {
301         struct pnp_port *port;
302         struct pnp_mem *mem;
303         struct pnp_irq *irq;
304         struct pnp_dma *dma;
305         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
306
307         if (!pnp_can_configure(dev))
308                 return -ENODEV;
309
310         down(&pnp_res_mutex);
311         pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
312         if (dev->independent) {
313                 port = dev->independent->port;
314                 mem = dev->independent->mem;
315                 irq = dev->independent->irq;
316                 dma = dev->independent->dma;
317                 while (port) {
318                         if (!pnp_assign_port(dev, port, nport))
319                                 goto fail;
320                         nport++;
321                         port = port->next;
322                 }
323                 while (mem) {
324                         if (!pnp_assign_mem(dev, mem, nmem))
325                                 goto fail;
326                         nmem++;
327                         mem = mem->next;
328                 }
329                 while (irq) {
330                         if (!pnp_assign_irq(dev, irq, nirq))
331                                 goto fail;
332                         nirq++;
333                         irq = irq->next;
334                 }
335                 while (dma) {
336                         if (!pnp_assign_dma(dev, dma, ndma))
337                                 goto fail;
338                         ndma++;
339                         dma = dma->next;
340                 }
341         }
342
343         if (depnum) {
344                 struct pnp_option *dep;
345                 int i;
346                 for (i=1,dep=dev->dependent; i<depnum; i++, dep=dep->next)
347                         if(!dep)
348                                 goto fail;
349                 port =dep->port;
350                 mem = dep->mem;
351                 irq = dep->irq;
352                 dma = dep->dma;
353                 while (port) {
354                         if (!pnp_assign_port(dev, port, nport))
355                                 goto fail;
356                         nport++;
357                         port = port->next;
358                 }
359                 while (mem) {
360                         if (!pnp_assign_mem(dev, mem, nmem))
361                                 goto fail;
362                         nmem++;
363                         mem = mem->next;
364                 }
365                 while (irq) {
366                         if (!pnp_assign_irq(dev, irq, nirq))
367                                 goto fail;
368                         nirq++;
369                         irq = irq->next;
370                 }
371                 while (dma) {
372                         if (!pnp_assign_dma(dev, dma, ndma))
373                                 goto fail;
374                         ndma++;
375                         dma = dma->next;
376                 }
377         } else if (dev->dependent)
378                 goto fail;
379
380         up(&pnp_res_mutex);
381         return 1;
382
383 fail:
384         pnp_clean_resource_table(&dev->res);
385         up(&pnp_res_mutex);
386         return 0;
387 }
388
389 /**
390  * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
391  * @dev: pointer to the desired device
392  * @res: pointer to the new resource config
393  * @mode: 0 or PNP_CONFIG_FORCE
394  *
395  * This function can be used by drivers that want to manually set thier resources.
396  */
397 int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table * res, int mode)
398 {
399         int i;
400         struct pnp_resource_table * bak;
401         if (!dev || !res)
402                 return -EINVAL;
403         if (!pnp_can_configure(dev))
404                 return -ENODEV;
405         bak = pnp_alloc(sizeof(struct pnp_resource_table));
406         if (!bak)
407                 return -ENOMEM;
408         *bak = dev->res;
409
410         down(&pnp_res_mutex);
411         dev->res = *res;
412         if (!(mode & PNP_CONFIG_FORCE)) {
413                 for (i = 0; i < PNP_MAX_PORT; i++) {
414                         if(!pnp_check_port(dev,i))
415                                 goto fail;
416                 }
417                 for (i = 0; i < PNP_MAX_MEM; i++) {
418                         if(!pnp_check_mem(dev,i))
419                                 goto fail;
420                 }
421                 for (i = 0; i < PNP_MAX_IRQ; i++) {
422                         if(!pnp_check_irq(dev,i))
423                                 goto fail;
424                 }
425                 for (i = 0; i < PNP_MAX_DMA; i++) {
426                         if(!pnp_check_dma(dev,i))
427                                 goto fail;
428                 }
429         }
430         up(&pnp_res_mutex);
431
432         kfree(bak);
433         return 0;
434
435 fail:
436         dev->res = *bak;
437         up(&pnp_res_mutex);
438         kfree(bak);
439         return -EINVAL;
440 }
441
442 /**
443  * pnp_auto_config_dev - automatically assigns resources to a device
444  * @dev: pointer to the desired device
445  *
446  */
447 int pnp_auto_config_dev(struct pnp_dev *dev)
448 {
449         struct pnp_option *dep;
450         int i = 1;
451
452         if(!dev)
453                 return -EINVAL;
454
455         if(!pnp_can_configure(dev)) {
456                 pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id);
457                 return -ENODEV;
458         }
459
460         if (!dev->dependent) {
461                 if (pnp_assign_resources(dev, 0))
462                         return 0;
463         } else {
464                 dep = dev->dependent;
465                 do {
466                         if (pnp_assign_resources(dev, i))
467                                 return 0;
468                         dep = dep->next;
469                         i++;
470                 } while (dep);
471         }
472
473         pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
474         return -EBUSY;
475 }
476
477 /**
478  * pnp_activate_dev - activates a PnP device for use
479  * @dev: pointer to the desired device
480  *
481  * does not validate or set resources so be careful.
482  */
483 int pnp_activate_dev(struct pnp_dev *dev)
484 {
485         if (!dev)
486                 return -EINVAL;
487         if (dev->active) {
488                 return 0; /* the device is already active */
489         }
490
491         /* ensure resources are allocated */
492         if (pnp_auto_config_dev(dev))
493                 return -EBUSY;
494
495         if (!pnp_can_write(dev)) {
496                 pnp_info("Device %s does not supported activation.", dev->dev.bus_id);
497                 return -EINVAL;
498         }
499
500         if (dev->protocol->set(dev, &dev->res)<0) {
501                 pnp_err("Failed to activate device %s.", dev->dev.bus_id);
502                 return -EIO;
503         }
504
505         dev->active = 1;
506         pnp_info("Device %s activated.", dev->dev.bus_id);
507
508         return 1;
509 }
510
511 /**
512  * pnp_disable_dev - disables device
513  * @dev: pointer to the desired device
514  *
515  * inform the correct pnp protocol so that resources can be used by other devices
516  */
517 int pnp_disable_dev(struct pnp_dev *dev)
518 {
519         if (!dev)
520                 return -EINVAL;
521         if (!dev->active) {
522                 return 0; /* the device is already disabled */
523         }
524
525         if (!pnp_can_disable(dev)) {
526                 pnp_info("Device %s does not supported disabling.", dev->dev.bus_id);
527                 return -EINVAL;
528         }
529         if (dev->protocol->disable(dev)<0) {
530                 pnp_err("Failed to disable device %s.", dev->dev.bus_id);
531                 return -EIO;
532         }
533
534         dev->active = 0;
535         pnp_info("Device %s disabled.", dev->dev.bus_id);
536
537         /* release the resources so that other devices can use them */
538         down(&pnp_res_mutex);
539         pnp_clean_resource_table(&dev->res);
540         up(&pnp_res_mutex);
541
542         return 1;
543 }
544
545 /**
546  * pnp_resource_change - change one resource
547  * @resource: pointer to resource to be changed
548  * @start: start of region
549  * @size: size of region
550  *
551  */
552 void pnp_resource_change(struct resource *resource, unsigned long start, unsigned long size)
553 {
554         if (resource == NULL)
555                 return;
556         resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
557         resource->start = start;
558         resource->end = start + size - 1;
559 }
560
561
562 EXPORT_SYMBOL(pnp_manual_config_dev);
563 EXPORT_SYMBOL(pnp_auto_config_dev);
564 EXPORT_SYMBOL(pnp_activate_dev);
565 EXPORT_SYMBOL(pnp_disable_dev);
566 EXPORT_SYMBOL(pnp_resource_change);
567 EXPORT_SYMBOL(pnp_init_resource_table);