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);