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 if (idx >= PNP_MAX_PORT) {
25 dev_err(&dev->dev, "too many I/O port resources\n");
26 /* pretend we were successful so at least the manager won't try again */
30 res = &dev->res.port_resource[idx];
32 /* check if this resource has been manually set, if so skip */
33 if (!(res->flags & IORESOURCE_AUTO)) {
34 dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
35 "flags %#lx\n", idx, (unsigned long long) res->start,
36 (unsigned long long) res->end, res->flags);
40 /* set the initial values */
41 res->flags |= rule->flags | IORESOURCE_IO;
42 res->flags &= ~IORESOURCE_UNSET;
45 res->flags |= IORESOURCE_DISABLED;
46 dev_dbg(&dev->dev, " io %d disabled\n", idx);
47 return 1; /* skip disabled resource requests */
50 res->start = rule->min;
51 res->end = res->start + rule->size - 1;
53 /* run through until pnp_check_port is happy */
54 while (!pnp_check_port(dev, res)) {
55 res->start += rule->align;
56 res->end = res->start + rule->size - 1;
57 if (res->start > rule->max || !rule->align) {
58 dev_dbg(&dev->dev, " couldn't assign io %d\n", idx);
62 dev_dbg(&dev->dev, " assign io %d %#llx-%#llx\n", idx,
63 (unsigned long long) res->start, (unsigned long long) res->end);
67 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
71 if (idx >= PNP_MAX_MEM) {
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 res = &dev->res.mem_resource[idx];
79 /* check if this resource has been manually set, if so skip */
80 if (!(res->flags & IORESOURCE_AUTO)) {
81 dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
82 "flags %#lx\n", idx, (unsigned long long) res->start,
83 (unsigned long long) res->end, res->flags);
87 /* set the initial values */
88 res->flags |= rule->flags | IORESOURCE_MEM;
89 res->flags &= ~IORESOURCE_UNSET;
91 /* convert pnp flags to standard Linux flags */
92 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
93 res->flags |= IORESOURCE_READONLY;
94 if (rule->flags & IORESOURCE_MEM_CACHEABLE)
95 res->flags |= IORESOURCE_CACHEABLE;
96 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
97 res->flags |= IORESOURCE_RANGELENGTH;
98 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
99 res->flags |= IORESOURCE_SHADOWABLE;
102 res->flags |= IORESOURCE_DISABLED;
103 dev_dbg(&dev->dev, " mem %d disabled\n", idx);
104 return 1; /* skip disabled resource requests */
107 res->start = rule->min;
108 res->end = res->start + rule->size - 1;
110 /* run through until pnp_check_mem is happy */
111 while (!pnp_check_mem(dev, res)) {
112 res->start += rule->align;
113 res->end = res->start + rule->size - 1;
114 if (res->start > rule->max || !rule->align) {
115 dev_dbg(&dev->dev, " couldn't assign mem %d\n", idx);
119 dev_dbg(&dev->dev, " assign mem %d %#llx-%#llx\n", idx,
120 (unsigned long long) res->start, (unsigned long long) res->end);
124 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
126 struct resource *res;
129 /* IRQ priority: this table is good for i386 */
130 static unsigned short xtab[16] = {
131 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
134 if (idx >= PNP_MAX_IRQ) {
135 dev_err(&dev->dev, "too many IRQ resources\n");
136 /* pretend we were successful so at least the manager won't try again */
140 res = &dev->res.irq_resource[idx];
142 /* check if this resource has been manually set, if so skip */
143 if (!(res->flags & IORESOURCE_AUTO)) {
144 dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
145 idx, (int) res->start, res->flags);
149 /* set the initial values */
150 res->flags |= rule->flags | IORESOURCE_IRQ;
151 res->flags &= ~IORESOURCE_UNSET;
153 if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
154 res->flags |= IORESOURCE_DISABLED;
155 dev_dbg(&dev->dev, " irq %d disabled\n", idx);
156 return 1; /* skip disabled resource requests */
159 /* TBD: need check for >16 IRQ */
160 res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
161 if (res->start < PNP_IRQ_NR) {
162 res->end = res->start;
163 dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
167 for (i = 0; i < 16; i++) {
168 if (test_bit(xtab[i], rule->map)) {
169 res->start = res->end = xtab[i];
170 if (pnp_check_irq(dev, res)) {
171 dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
177 dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
181 static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
183 struct resource *res;
186 /* DMA priority: this table is good for i386 */
187 static unsigned short xtab[8] = {
188 1, 3, 5, 6, 7, 0, 2, 4
191 if (idx >= PNP_MAX_DMA) {
192 dev_err(&dev->dev, "too many DMA resources\n");
196 res = &dev->res.dma_resource[idx];
198 /* check if this resource has been manually set, if so skip */
199 if (!(res->flags & IORESOURCE_AUTO)) {
200 dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
201 idx, (int) res->start, res->flags);
205 /* set the initial values */
206 res->flags |= rule->flags | IORESOURCE_DMA;
207 res->flags &= ~IORESOURCE_UNSET;
209 for (i = 0; i < 8; i++) {
210 if (rule->map & (1 << xtab[i])) {
211 res->start = res->end = xtab[i];
212 if (pnp_check_dma(dev, res)) {
213 dev_dbg(&dev->dev, " assign dma %d %d\n", idx,
219 #ifdef MAX_DMA_CHANNELS
220 res->start = res->end = MAX_DMA_CHANNELS;
222 res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
223 dev_dbg(&dev->dev, " disable dma %d\n", idx);
226 void pnp_init_resource(struct resource *res)
230 type = res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
231 IORESOURCE_IRQ | IORESOURCE_DMA);
234 res->flags = type | IORESOURCE_AUTO | IORESOURCE_UNSET;
235 if (type == IORESOURCE_IRQ || type == IORESOURCE_DMA) {
245 * pnp_init_resources - Resets a resource table to default values.
246 * @table: pointer to the desired resource table
248 void pnp_init_resources(struct pnp_dev *dev)
250 struct resource *res;
253 for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
254 res = &dev->res.irq_resource[idx];
255 res->flags = IORESOURCE_IRQ;
256 pnp_init_resource(res);
258 for (idx = 0; idx < PNP_MAX_DMA; idx++) {
259 res = &dev->res.dma_resource[idx];
260 res->flags = IORESOURCE_DMA;
261 pnp_init_resource(res);
263 for (idx = 0; idx < PNP_MAX_PORT; idx++) {
264 res = &dev->res.port_resource[idx];
265 res->flags = IORESOURCE_IO;
266 pnp_init_resource(res);
268 for (idx = 0; idx < PNP_MAX_MEM; idx++) {
269 res = &dev->res.mem_resource[idx];
270 res->flags = IORESOURCE_MEM;
271 pnp_init_resource(res);
276 * pnp_clean_resources - clears resources that were not manually set
277 * @res: the resources to clean
279 static void pnp_clean_resource_table(struct pnp_dev *dev)
281 struct resource *res;
284 for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
285 res = &dev->res.irq_resource[idx];
286 if (res->flags & IORESOURCE_AUTO) {
287 res->flags = IORESOURCE_IRQ;
288 pnp_init_resource(res);
291 for (idx = 0; idx < PNP_MAX_DMA; idx++) {
292 res = &dev->res.dma_resource[idx];
293 if (res->flags & IORESOURCE_AUTO) {
294 res->flags = IORESOURCE_DMA;
295 pnp_init_resource(res);
298 for (idx = 0; idx < PNP_MAX_PORT; idx++) {
299 res = &dev->res.port_resource[idx];
300 if (res->flags & IORESOURCE_AUTO) {
301 res->flags = IORESOURCE_IO;
302 pnp_init_resource(res);
305 for (idx = 0; idx < PNP_MAX_MEM; idx++) {
306 res = &dev->res.mem_resource[idx];
307 if (res->flags & IORESOURCE_AUTO) {
308 res->flags = IORESOURCE_MEM;
309 pnp_init_resource(res);
315 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
316 * @dev: pointer to the desired device
317 * @depnum: the dependent function number
319 * Only set depnum to 0 if the device does not have dependent options.
321 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
323 struct pnp_port *port;
327 int nport = 0, nmem = 0, nirq = 0, ndma = 0;
329 if (!pnp_can_configure(dev))
332 dbg_pnp_show_resources(dev, "before pnp_assign_resources");
333 mutex_lock(&pnp_res_mutex);
334 pnp_clean_resource_table(dev);
335 if (dev->independent) {
336 dev_dbg(&dev->dev, "assigning independent options\n");
337 port = dev->independent->port;
338 mem = dev->independent->mem;
339 irq = dev->independent->irq;
340 dma = dev->independent->dma;
342 if (!pnp_assign_port(dev, port, nport))
348 if (!pnp_assign_mem(dev, mem, nmem))
354 if (!pnp_assign_irq(dev, irq, nirq))
360 pnp_assign_dma(dev, dma, ndma);
367 struct pnp_option *dep;
370 dev_dbg(&dev->dev, "assigning dependent option %d\n", depnum);
371 for (i = 1, dep = dev->dependent; i < depnum;
372 i++, dep = dep->next)
380 if (!pnp_assign_port(dev, port, nport))
386 if (!pnp_assign_mem(dev, mem, nmem))
392 if (!pnp_assign_irq(dev, irq, nirq))
398 pnp_assign_dma(dev, dma, ndma);
402 } else if (dev->dependent)
405 mutex_unlock(&pnp_res_mutex);
406 dbg_pnp_show_resources(dev, "after pnp_assign_resources");
410 pnp_clean_resource_table(dev);
411 mutex_unlock(&pnp_res_mutex);
412 dbg_pnp_show_resources(dev, "after pnp_assign_resources (failed)");
417 * pnp_auto_config_dev - automatically assigns resources to a device
418 * @dev: pointer to the desired device
420 int pnp_auto_config_dev(struct pnp_dev *dev)
422 struct pnp_option *dep;
425 if (!pnp_can_configure(dev)) {
426 dev_dbg(&dev->dev, "configuration not supported\n");
430 if (!dev->dependent) {
431 if (pnp_assign_resources(dev, 0))
434 dep = dev->dependent;
436 if (pnp_assign_resources(dev, i))
443 dev_err(&dev->dev, "unable to assign resources\n");
448 * pnp_start_dev - low-level start of the PnP device
449 * @dev: pointer to the desired device
451 * assumes that resources have already been allocated
453 int pnp_start_dev(struct pnp_dev *dev)
455 if (!pnp_can_write(dev)) {
456 dev_dbg(&dev->dev, "activation not supported\n");
460 dbg_pnp_show_resources(dev, "pnp_start_dev");
461 if (dev->protocol->set(dev) < 0) {
462 dev_err(&dev->dev, "activation failed\n");
466 dev_info(&dev->dev, "activated\n");
471 * pnp_stop_dev - low-level disable of the PnP device
472 * @dev: pointer to the desired device
474 * does not free resources
476 int pnp_stop_dev(struct pnp_dev *dev)
478 if (!pnp_can_disable(dev)) {
479 dev_dbg(&dev->dev, "disabling not supported\n");
482 if (dev->protocol->disable(dev) < 0) {
483 dev_err(&dev->dev, "disable failed\n");
487 dev_info(&dev->dev, "disabled\n");
492 * pnp_activate_dev - activates a PnP device for use
493 * @dev: pointer to the desired device
495 * does not validate or set resources so be careful.
497 int pnp_activate_dev(struct pnp_dev *dev)
504 /* ensure resources are allocated */
505 if (pnp_auto_config_dev(dev))
508 error = pnp_start_dev(dev);
517 * pnp_disable_dev - disables device
518 * @dev: pointer to the desired device
520 * inform the correct pnp protocol so that resources can be used by other devices
522 int pnp_disable_dev(struct pnp_dev *dev)
529 error = pnp_stop_dev(dev);
535 /* release the resources so that other devices can use them */
536 mutex_lock(&pnp_res_mutex);
537 pnp_clean_resource_table(dev);
538 mutex_unlock(&pnp_res_mutex);
543 EXPORT_SYMBOL(pnp_start_dev);
544 EXPORT_SYMBOL(pnp_stop_dev);
545 EXPORT_SYMBOL(pnp_activate_dev);
546 EXPORT_SYMBOL(pnp_disable_dev);