2 * manager.c - Resource Management, Conflict Resolution, Activation and Disabling of Devices
4 * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz>
5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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 #include <linux/pnp.h>
15 #include <linux/slab.h>
16 #include <linux/bitmap.h>
19 DECLARE_MUTEX(pnp_res_mutex);
21 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
23 unsigned long *start, *end, *flags;
28 if (idx >= PNP_MAX_PORT) {
29 pnp_err("More than 4 ports is incompatible with pnp specifications.");
30 /* pretend we were successful so at least the manager won't try again */
34 /* check if this resource has been manually set, if so skip */
35 if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO))
38 start = &dev->res.port_resource[idx].start;
39 end = &dev->res.port_resource[idx].end;
40 flags = &dev->res.port_resource[idx].flags;
42 /* set the initial values */
43 *flags |= rule->flags | IORESOURCE_IO;
44 *flags &= ~IORESOURCE_UNSET;
47 *flags |= IORESOURCE_DISABLED;
48 return 1; /* skip disabled resource requests */
52 *end = *start + rule->size - 1;
54 /* run through until pnp_check_port is happy */
55 while (!pnp_check_port(dev, idx)) {
56 *start += rule->align;
57 *end = *start + rule->size - 1;
58 if (*start > rule->max || !rule->align)
64 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
66 unsigned long *start, *end, *flags;
71 if (idx >= PNP_MAX_MEM) {
72 pnp_err("More than 8 mems is incompatible with pnp specifications.");
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 (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO))
81 start = &dev->res.mem_resource[idx].start;
82 end = &dev->res.mem_resource[idx].end;
83 flags = &dev->res.mem_resource[idx].flags;
85 /* set the initial values */
86 *flags |= rule->flags | IORESOURCE_MEM;
87 *flags &= ~IORESOURCE_UNSET;
89 /* convert pnp flags to standard Linux flags */
90 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
91 *flags |= IORESOURCE_READONLY;
92 if (rule->flags & IORESOURCE_MEM_CACHEABLE)
93 *flags |= IORESOURCE_CACHEABLE;
94 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
95 *flags |= IORESOURCE_RANGELENGTH;
96 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
97 *flags |= IORESOURCE_SHADOWABLE;
100 *flags |= IORESOURCE_DISABLED;
101 return 1; /* skip disabled resource requests */
105 *end = *start + rule->size -1;
107 /* run through until pnp_check_mem is happy */
108 while (!pnp_check_mem(dev, idx)) {
109 *start += rule->align;
110 *end = *start + rule->size - 1;
111 if (*start > rule->max || !rule->align)
117 static int pnp_assign_irq(struct pnp_dev * dev, struct pnp_irq *rule, int idx)
119 unsigned long *start, *end, *flags;
122 /* IRQ priority: this table is good for i386 */
123 static unsigned short xtab[16] = {
124 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
130 if (idx >= PNP_MAX_IRQ) {
131 pnp_err("More than 2 irqs is incompatible with pnp specifications.");
132 /* pretend we were successful so at least the manager won't try again */
136 /* check if this resource has been manually set, if so skip */
137 if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO))
140 start = &dev->res.irq_resource[idx].start;
141 end = &dev->res.irq_resource[idx].end;
142 flags = &dev->res.irq_resource[idx].flags;
144 /* set the initial values */
145 *flags |= rule->flags | IORESOURCE_IRQ;
146 *flags &= ~IORESOURCE_UNSET;
148 if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
149 *flags |= IORESOURCE_DISABLED;
150 return 1; /* skip disabled resource requests */
153 /* TBD: need check for >16 IRQ */
154 *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
155 if (*start < PNP_IRQ_NR) {
159 for (i = 0; i < 16; i++) {
160 if(test_bit(xtab[i], rule->map)) {
161 *start = *end = xtab[i];
162 if(pnp_check_irq(dev, idx))
169 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
171 unsigned long *start, *end, *flags;
174 /* DMA priority: this table is good for i386 */
175 static unsigned short xtab[8] = {
176 1, 3, 5, 6, 7, 0, 2, 4
182 if (idx >= PNP_MAX_DMA) {
183 pnp_err("More than 2 dmas is incompatible with pnp specifications.");
184 /* pretend we were successful so at least the manager won't try again */
188 /* check if this resource has been manually set, if so skip */
189 if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO))
192 start = &dev->res.dma_resource[idx].start;
193 end = &dev->res.dma_resource[idx].end;
194 flags = &dev->res.dma_resource[idx].flags;
196 /* set the initial values */
197 *flags |= rule->flags | IORESOURCE_DMA;
198 *flags &= ~IORESOURCE_UNSET;
201 *flags |= IORESOURCE_DISABLED;
202 return 1; /* skip disabled resource requests */
205 for (i = 0; i < 8; i++) {
206 if(rule->map & (1<<xtab[i])) {
207 *start = *end = xtab[i];
208 if(pnp_check_dma(dev, idx))
216 * pnp_init_resources - Resets a resource table to default values.
217 * @table: pointer to the desired resource table
220 void pnp_init_resource_table(struct pnp_resource_table *table)
223 for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
224 table->irq_resource[idx].name = NULL;
225 table->irq_resource[idx].start = -1;
226 table->irq_resource[idx].end = -1;
227 table->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
229 for (idx = 0; idx < PNP_MAX_DMA; idx++) {
230 table->dma_resource[idx].name = NULL;
231 table->dma_resource[idx].start = -1;
232 table->dma_resource[idx].end = -1;
233 table->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
235 for (idx = 0; idx < PNP_MAX_PORT; idx++) {
236 table->port_resource[idx].name = NULL;
237 table->port_resource[idx].start = 0;
238 table->port_resource[idx].end = 0;
239 table->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
241 for (idx = 0; idx < PNP_MAX_MEM; idx++) {
242 table->mem_resource[idx].name = NULL;
243 table->mem_resource[idx].start = 0;
244 table->mem_resource[idx].end = 0;
245 table->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
250 * pnp_clean_resources - clears resources that were not manually set
251 * @res: the resources to clean
254 static void pnp_clean_resource_table(struct pnp_resource_table * res)
257 for (idx = 0; idx < PNP_MAX_IRQ; idx++) {
258 if (!(res->irq_resource[idx].flags & IORESOURCE_AUTO))
260 res->irq_resource[idx].start = -1;
261 res->irq_resource[idx].end = -1;
262 res->irq_resource[idx].flags = IORESOURCE_IRQ | IORESOURCE_AUTO | IORESOURCE_UNSET;
264 for (idx = 0; idx < PNP_MAX_DMA; idx++) {
265 if (!(res->dma_resource[idx].flags & IORESOURCE_AUTO))
267 res->dma_resource[idx].start = -1;
268 res->dma_resource[idx].end = -1;
269 res->dma_resource[idx].flags = IORESOURCE_DMA | IORESOURCE_AUTO | IORESOURCE_UNSET;
271 for (idx = 0; idx < PNP_MAX_PORT; idx++) {
272 if (!(res->port_resource[idx].flags & IORESOURCE_AUTO))
274 res->port_resource[idx].start = 0;
275 res->port_resource[idx].end = 0;
276 res->port_resource[idx].flags = IORESOURCE_IO | IORESOURCE_AUTO | IORESOURCE_UNSET;
278 for (idx = 0; idx < PNP_MAX_MEM; idx++) {
279 if (!(res->mem_resource[idx].flags & IORESOURCE_AUTO))
281 res->mem_resource[idx].start = 0;
282 res->mem_resource[idx].end = 0;
283 res->mem_resource[idx].flags = IORESOURCE_MEM | IORESOURCE_AUTO | IORESOURCE_UNSET;
288 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
289 * @dev: pointer to the desired device
290 * @depnum: the dependent function number
292 * Only set depnum to 0 if the device does not have dependent options.
294 static int pnp_assign_resources(struct pnp_dev *dev, int depnum)
296 struct pnp_port *port;
300 int nport = 0, nmem = 0, nirq = 0, ndma = 0;
302 if (!pnp_can_configure(dev))
305 down(&pnp_res_mutex);
306 pnp_clean_resource_table(&dev->res); /* start with a fresh slate */
307 if (dev->independent) {
308 port = dev->independent->port;
309 mem = dev->independent->mem;
310 irq = dev->independent->irq;
311 dma = dev->independent->dma;
313 if (!pnp_assign_port(dev, port, nport))
319 if (!pnp_assign_mem(dev, mem, nmem))
325 if (!pnp_assign_irq(dev, irq, nirq))
331 if (!pnp_assign_dma(dev, dma, ndma))
339 struct pnp_option *dep;
341 for (i=1,dep=dev->dependent; i<depnum; i++, dep=dep->next)
349 if (!pnp_assign_port(dev, port, nport))
355 if (!pnp_assign_mem(dev, mem, nmem))
361 if (!pnp_assign_irq(dev, irq, nirq))
367 if (!pnp_assign_dma(dev, dma, ndma))
372 } else if (dev->dependent)
379 pnp_clean_resource_table(&dev->res);
385 * pnp_manual_config_dev - Disables Auto Config and Manually sets the resource table
386 * @dev: pointer to the desired device
387 * @res: pointer to the new resource config
388 * @mode: 0 or PNP_CONFIG_FORCE
390 * This function can be used by drivers that want to manually set thier resources.
392 int pnp_manual_config_dev(struct pnp_dev *dev, struct pnp_resource_table * res, int mode)
395 struct pnp_resource_table * bak;
398 if (!pnp_can_configure(dev))
400 bak = pnp_alloc(sizeof(struct pnp_resource_table));
405 down(&pnp_res_mutex);
407 if (!(mode & PNP_CONFIG_FORCE)) {
408 for (i = 0; i < PNP_MAX_PORT; i++) {
409 if(!pnp_check_port(dev,i))
412 for (i = 0; i < PNP_MAX_MEM; i++) {
413 if(!pnp_check_mem(dev,i))
416 for (i = 0; i < PNP_MAX_IRQ; i++) {
417 if(!pnp_check_irq(dev,i))
420 for (i = 0; i < PNP_MAX_DMA; i++) {
421 if(!pnp_check_dma(dev,i))
438 * pnp_auto_config_dev - automatically assigns resources to a device
439 * @dev: pointer to the desired device
442 int pnp_auto_config_dev(struct pnp_dev *dev)
444 struct pnp_option *dep;
450 if(!pnp_can_configure(dev)) {
451 pnp_info("Device %s does not support resource configuration.", dev->dev.bus_id);
455 if (!dev->dependent) {
456 if (pnp_assign_resources(dev, 0))
459 dep = dev->dependent;
461 if (pnp_assign_resources(dev, i))
468 pnp_err("Unable to assign resources to device %s.", dev->dev.bus_id);
473 * pnp_activate_dev - activates a PnP device for use
474 * @dev: pointer to the desired device
476 * does not validate or set resources so be careful.
478 int pnp_activate_dev(struct pnp_dev *dev)
483 return 0; /* the device is already active */
486 /* ensure resources are allocated */
487 if (pnp_auto_config_dev(dev))
490 if (!pnp_can_write(dev)) {
491 pnp_info("Device %s does not supported activation.", dev->dev.bus_id);
495 if (dev->protocol->set(dev, &dev->res)<0) {
496 pnp_err("Failed to activate device %s.", dev->dev.bus_id);
501 pnp_info("Device %s activated.", dev->dev.bus_id);
507 * pnp_disable_dev - disables device
508 * @dev: pointer to the desired device
510 * inform the correct pnp protocol so that resources can be used by other devices
512 int pnp_disable_dev(struct pnp_dev *dev)
517 return 0; /* the device is already disabled */
520 if (!pnp_can_disable(dev)) {
521 pnp_info("Device %s does not supported disabling.", dev->dev.bus_id);
524 if (dev->protocol->disable(dev)<0) {
525 pnp_err("Failed to disable device %s.", dev->dev.bus_id);
530 pnp_info("Device %s disabled.", dev->dev.bus_id);
532 /* release the resources so that other devices can use them */
533 down(&pnp_res_mutex);
534 pnp_clean_resource_table(&dev->res);
541 * pnp_resource_change - change one resource
542 * @resource: pointer to resource to be changed
543 * @start: start of region
544 * @size: size of region
547 void pnp_resource_change(struct resource *resource, unsigned long start, unsigned long size)
549 if (resource == NULL)
551 resource->flags &= ~(IORESOURCE_AUTO | IORESOURCE_UNSET);
552 resource->start = start;
553 resource->end = start + size - 1;
557 EXPORT_SYMBOL(pnp_manual_config_dev);
558 EXPORT_SYMBOL(pnp_auto_config_dev);
559 EXPORT_SYMBOL(pnp_activate_dev);
560 EXPORT_SYMBOL(pnp_disable_dev);
561 EXPORT_SYMBOL(pnp_resource_change);
562 EXPORT_SYMBOL(pnp_init_resource_table);