2 * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
4 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
8 #include <linux/errno.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/pnp.h>
13 #include <linux/slab.h>
14 #include <linux/bitmap.h>
15 #include <linux/mutex.h>
18 DEFINE_MUTEX(pnp_res_mutex
);
20 static int pnp_assign_port(struct pnp_dev
*dev
, struct pnp_port
*rule
, int idx
)
24 res
= pnp_get_resource(dev
, IORESOURCE_IO
, idx
);
26 dev_err(&dev
->dev
, "too many I/O port resources\n");
27 /* pretend we were successful so at least the manager won't try again */
31 /* check if this resource has been manually set, if so skip */
32 if (!(res
->flags
& IORESOURCE_AUTO
)) {
33 dev_dbg(&dev
->dev
, " io %d already set to %#llx-%#llx "
34 "flags %#lx\n", idx
, (unsigned long long) res
->start
,
35 (unsigned long long) res
->end
, res
->flags
);
39 /* set the initial values */
40 res
->flags
|= rule
->flags
| IORESOURCE_IO
;
41 res
->flags
&= ~IORESOURCE_UNSET
;
44 res
->flags
|= IORESOURCE_DISABLED
;
45 dev_dbg(&dev
->dev
, " io %d disabled\n", idx
);
46 return 1; /* skip disabled resource requests */
49 res
->start
= rule
->min
;
50 res
->end
= res
->start
+ rule
->size
- 1;
52 /* run through until pnp_check_port is happy */
53 while (!pnp_check_port(dev
, res
)) {
54 res
->start
+= rule
->align
;
55 res
->end
= res
->start
+ rule
->size
- 1;
56 if (res
->start
> rule
->max
|| !rule
->align
) {
57 dev_dbg(&dev
->dev
, " couldn't assign io %d\n", idx
);
61 dev_dbg(&dev
->dev
, " assign io %d %#llx-%#llx\n", idx
,
62 (unsigned long long) res
->start
, (unsigned long long) res
->end
);
66 static int pnp_assign_mem(struct pnp_dev
*dev
, struct pnp_mem
*rule
, int idx
)
70 res
= pnp_get_resource(dev
, IORESOURCE_MEM
, idx
);
72 dev_err(&dev
->dev
, "too many memory resources\n");
73 /* pretend we were successful so at least the manager won't try again */
77 /* check if this resource has been manually set, if so skip */
78 if (!(res
->flags
& IORESOURCE_AUTO
)) {
79 dev_dbg(&dev
->dev
, " mem %d already set to %#llx-%#llx "
80 "flags %#lx\n", idx
, (unsigned long long) res
->start
,
81 (unsigned long long) res
->end
, res
->flags
);
85 /* set the initial values */
86 res
->flags
|= rule
->flags
| IORESOURCE_MEM
;
87 res
->flags
&= ~IORESOURCE_UNSET
;
89 /* convert pnp flags to standard Linux flags */
90 if (!(rule
->flags
& IORESOURCE_MEM_WRITEABLE
))
91 res
->flags
|= IORESOURCE_READONLY
;
92 if (rule
->flags
& IORESOURCE_MEM_CACHEABLE
)
93 res
->flags
|= IORESOURCE_CACHEABLE
;
94 if (rule
->flags
& IORESOURCE_MEM_RANGELENGTH
)
95 res
->flags
|= IORESOURCE_RANGELENGTH
;
96 if (rule
->flags
& IORESOURCE_MEM_SHADOWABLE
)
97 res
->flags
|= IORESOURCE_SHADOWABLE
;
100 res
->flags
|= IORESOURCE_DISABLED
;
101 dev_dbg(&dev
->dev
, " mem %d disabled\n", idx
);
102 return 1; /* skip disabled resource requests */
105 res
->start
= rule
->min
;
106 res
->end
= res
->start
+ rule
->size
- 1;
108 /* run through until pnp_check_mem is happy */
109 while (!pnp_check_mem(dev
, res
)) {
110 res
->start
+= rule
->align
;
111 res
->end
= res
->start
+ rule
->size
- 1;
112 if (res
->start
> rule
->max
|| !rule
->align
) {
113 dev_dbg(&dev
->dev
, " couldn't assign mem %d\n", idx
);
117 dev_dbg(&dev
->dev
, " assign mem %d %#llx-%#llx\n", idx
,
118 (unsigned long long) res
->start
, (unsigned long long) res
->end
);
122 static int pnp_assign_irq(struct pnp_dev
*dev
, struct pnp_irq
*rule
, int idx
)
124 struct resource
*res
;
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
132 res
= pnp_get_resource(dev
, IORESOURCE_IRQ
, idx
);
134 dev_err(&dev
->dev
, "too many IRQ resources\n");
135 /* pretend we were successful so at least the manager won't try again */
139 /* check if this resource has been manually set, if so skip */
140 if (!(res
->flags
& IORESOURCE_AUTO
)) {
141 dev_dbg(&dev
->dev
, " irq %d already set to %d flags %#lx\n",
142 idx
, (int) res
->start
, res
->flags
);
146 /* set the initial values */
147 res
->flags
|= rule
->flags
| IORESOURCE_IRQ
;
148 res
->flags
&= ~IORESOURCE_UNSET
;
150 if (bitmap_empty(rule
->map
, PNP_IRQ_NR
)) {
151 res
->flags
|= IORESOURCE_DISABLED
;
152 dev_dbg(&dev
->dev
, " irq %d disabled\n", idx
);
153 return 1; /* skip disabled resource requests */
156 /* TBD: need check for >16 IRQ */
157 res
->start
= find_next_bit(rule
->map
, PNP_IRQ_NR
, 16);
158 if (res
->start
< PNP_IRQ_NR
) {
159 res
->end
= res
->start
;
160 dev_dbg(&dev
->dev
, " assign irq %d %d\n", idx
,
164 for (i
= 0; i
< 16; i
++) {
165 if (test_bit(xtab
[i
], rule
->map
)) {
166 res
->start
= res
->end
= xtab
[i
];
167 if (pnp_check_irq(dev
, res
)) {
168 dev_dbg(&dev
->dev
, " assign irq %d %d\n", idx
,
174 dev_dbg(&dev
->dev
, " couldn't assign irq %d\n", idx
);
178 static void pnp_assign_dma(struct pnp_dev
*dev
, struct pnp_dma
*rule
, int idx
)
180 struct resource
*res
;
183 /* DMA priority: this table is good for i386 */
184 static unsigned short xtab
[8] = {
185 1, 3, 5, 6, 7, 0, 2, 4
188 res
= pnp_get_resource(dev
, IORESOURCE_DMA
, idx
);
190 dev_err(&dev
->dev
, "too many DMA resources\n");
194 /* check if this resource has been manually set, if so skip */
195 if (!(res
->flags
& IORESOURCE_AUTO
)) {
196 dev_dbg(&dev
->dev
, " dma %d already set to %d flags %#lx\n",
197 idx
, (int) res
->start
, res
->flags
);
201 /* set the initial values */
202 res
->flags
|= rule
->flags
| IORESOURCE_DMA
;
203 res
->flags
&= ~IORESOURCE_UNSET
;
205 for (i
= 0; i
< 8; i
++) {
206 if (rule
->map
& (1 << xtab
[i
])) {
207 res
->start
= res
->end
= xtab
[i
];
208 if (pnp_check_dma(dev
, res
)) {
209 dev_dbg(&dev
->dev
, " assign dma %d %d\n", idx
,
215 #ifdef MAX_DMA_CHANNELS
216 res
->start
= res
->end
= MAX_DMA_CHANNELS
;
218 res
->flags
|= IORESOURCE_UNSET
| IORESOURCE_DISABLED
;
219 dev_dbg(&dev
->dev
, " disable dma %d\n", idx
);
222 void pnp_init_resource(struct resource
*res
)
226 type
= res
->flags
& (IORESOURCE_IO
| IORESOURCE_MEM
|
227 IORESOURCE_IRQ
| IORESOURCE_DMA
);
230 res
->flags
= type
| IORESOURCE_AUTO
| IORESOURCE_UNSET
;
231 if (type
== IORESOURCE_IRQ
|| type
== IORESOURCE_DMA
) {
241 * pnp_init_resources - Resets a resource table to default values.
242 * @table: pointer to the desired resource table
244 void pnp_init_resources(struct pnp_dev
*dev
)
246 struct resource
*res
;
249 for (idx
= 0; idx
< PNP_MAX_IRQ
; idx
++) {
250 res
= &dev
->res
->irq_resource
[idx
];
251 res
->flags
= IORESOURCE_IRQ
;
252 pnp_init_resource(res
);
254 for (idx
= 0; idx
< PNP_MAX_DMA
; idx
++) {
255 res
= &dev
->res
->dma_resource
[idx
];
256 res
->flags
= IORESOURCE_DMA
;
257 pnp_init_resource(res
);
259 for (idx
= 0; idx
< PNP_MAX_PORT
; idx
++) {
260 res
= &dev
->res
->port_resource
[idx
];
261 res
->flags
= IORESOURCE_IO
;
262 pnp_init_resource(res
);
264 for (idx
= 0; idx
< PNP_MAX_MEM
; idx
++) {
265 res
= &dev
->res
->mem_resource
[idx
];
266 res
->flags
= IORESOURCE_MEM
;
267 pnp_init_resource(res
);
272 * pnp_clean_resources - clears resources that were not manually set
273 * @res: the resources to clean
275 static void pnp_clean_resource_table(struct pnp_dev
*dev
)
277 struct resource
*res
;
280 for (idx
= 0; idx
< PNP_MAX_IRQ
; idx
++) {
281 res
= &dev
->res
->irq_resource
[idx
];
282 if (res
->flags
& IORESOURCE_AUTO
) {
283 res
->flags
= IORESOURCE_IRQ
;
284 pnp_init_resource(res
);
287 for (idx
= 0; idx
< PNP_MAX_DMA
; idx
++) {
288 res
= &dev
->res
->dma_resource
[idx
];
289 if (res
->flags
& IORESOURCE_AUTO
) {
290 res
->flags
= IORESOURCE_DMA
;
291 pnp_init_resource(res
);
294 for (idx
= 0; idx
< PNP_MAX_PORT
; idx
++) {
295 res
= &dev
->res
->port_resource
[idx
];
296 if (res
->flags
& IORESOURCE_AUTO
) {
297 res
->flags
= IORESOURCE_IO
;
298 pnp_init_resource(res
);
301 for (idx
= 0; idx
< PNP_MAX_MEM
; idx
++) {
302 res
= &dev
->res
->mem_resource
[idx
];
303 if (res
->flags
& IORESOURCE_AUTO
) {
304 res
->flags
= IORESOURCE_MEM
;
305 pnp_init_resource(res
);
311 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
312 * @dev: pointer to the desired device
313 * @depnum: the dependent function number
315 * Only set depnum to 0 if the device does not have dependent options.
317 static int pnp_assign_resources(struct pnp_dev
*dev
, int depnum
)
319 struct pnp_port
*port
;
323 int nport
= 0, nmem
= 0, nirq
= 0, ndma
= 0;
325 if (!pnp_can_configure(dev
))
328 dbg_pnp_show_resources(dev
, "before pnp_assign_resources");
329 mutex_lock(&pnp_res_mutex
);
330 pnp_clean_resource_table(dev
);
331 if (dev
->independent
) {
332 dev_dbg(&dev
->dev
, "assigning independent options\n");
333 port
= dev
->independent
->port
;
334 mem
= dev
->independent
->mem
;
335 irq
= dev
->independent
->irq
;
336 dma
= dev
->independent
->dma
;
338 if (!pnp_assign_port(dev
, port
, nport
))
344 if (!pnp_assign_mem(dev
, mem
, nmem
))
350 if (!pnp_assign_irq(dev
, irq
, nirq
))
356 pnp_assign_dma(dev
, dma
, ndma
);
363 struct pnp_option
*dep
;
366 dev_dbg(&dev
->dev
, "assigning dependent option %d\n", depnum
);
367 for (i
= 1, dep
= dev
->dependent
; i
< depnum
;
368 i
++, dep
= dep
->next
)
376 if (!pnp_assign_port(dev
, port
, nport
))
382 if (!pnp_assign_mem(dev
, mem
, nmem
))
388 if (!pnp_assign_irq(dev
, irq
, nirq
))
394 pnp_assign_dma(dev
, dma
, ndma
);
398 } else if (dev
->dependent
)
401 mutex_unlock(&pnp_res_mutex
);
402 dbg_pnp_show_resources(dev
, "after pnp_assign_resources");
406 pnp_clean_resource_table(dev
);
407 mutex_unlock(&pnp_res_mutex
);
408 dbg_pnp_show_resources(dev
, "after pnp_assign_resources (failed)");
413 * pnp_auto_config_dev - automatically assigns resources to a device
414 * @dev: pointer to the desired device
416 int pnp_auto_config_dev(struct pnp_dev
*dev
)
418 struct pnp_option
*dep
;
421 if (!pnp_can_configure(dev
)) {
422 dev_dbg(&dev
->dev
, "configuration not supported\n");
426 if (!dev
->dependent
) {
427 if (pnp_assign_resources(dev
, 0))
430 dep
= dev
->dependent
;
432 if (pnp_assign_resources(dev
, i
))
439 dev_err(&dev
->dev
, "unable to assign resources\n");
444 * pnp_start_dev - low-level start of the PnP device
445 * @dev: pointer to the desired device
447 * assumes that resources have already been allocated
449 int pnp_start_dev(struct pnp_dev
*dev
)
451 if (!pnp_can_write(dev
)) {
452 dev_dbg(&dev
->dev
, "activation not supported\n");
456 dbg_pnp_show_resources(dev
, "pnp_start_dev");
457 if (dev
->protocol
->set(dev
) < 0) {
458 dev_err(&dev
->dev
, "activation failed\n");
462 dev_info(&dev
->dev
, "activated\n");
467 * pnp_stop_dev - low-level disable of the PnP device
468 * @dev: pointer to the desired device
470 * does not free resources
472 int pnp_stop_dev(struct pnp_dev
*dev
)
474 if (!pnp_can_disable(dev
)) {
475 dev_dbg(&dev
->dev
, "disabling not supported\n");
478 if (dev
->protocol
->disable(dev
) < 0) {
479 dev_err(&dev
->dev
, "disable failed\n");
483 dev_info(&dev
->dev
, "disabled\n");
488 * pnp_activate_dev - activates a PnP device for use
489 * @dev: pointer to the desired device
491 * does not validate or set resources so be careful.
493 int pnp_activate_dev(struct pnp_dev
*dev
)
500 /* ensure resources are allocated */
501 if (pnp_auto_config_dev(dev
))
504 error
= pnp_start_dev(dev
);
513 * pnp_disable_dev - disables device
514 * @dev: pointer to the desired device
516 * inform the correct pnp protocol so that resources can be used by other devices
518 int pnp_disable_dev(struct pnp_dev
*dev
)
525 error
= pnp_stop_dev(dev
);
531 /* release the resources so that other devices can use them */
532 mutex_lock(&pnp_res_mutex
);
533 pnp_clean_resource_table(dev
);
534 mutex_unlock(&pnp_res_mutex
);
539 EXPORT_SYMBOL(pnp_start_dev
);
540 EXPORT_SYMBOL(pnp_stop_dev
);
541 EXPORT_SYMBOL(pnp_activate_dev
);
542 EXPORT_SYMBOL(pnp_disable_dev
);