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@perex.cz>
5 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
6 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
7 * Bjorn Helgaas <bjorn.helgaas@hp.com>
8 */
9
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/bitmap.h>
16 #include <linux/mutex.h>
17 #include "base.h"
18
19 DEFINE_MUTEX(pnp_res_mutex);
20
pnp_assign_port(struct pnp_dev * dev,struct pnp_port * rule,int idx)21 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
22 {
23 struct resource *res, local_res;
24
25 res = pnp_get_resource(dev, IORESOURCE_IO, idx);
26 if (res) {
27 pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
28 "flags %#lx\n", idx, (unsigned long long) res->start,
29 (unsigned long long) res->end, res->flags);
30 return 0;
31 }
32
33 res = &local_res;
34 res->flags = rule->flags | IORESOURCE_AUTO;
35 res->start = 0;
36 res->end = 0;
37
38 if (!rule->size) {
39 res->flags |= IORESOURCE_DISABLED;
40 pnp_dbg(&dev->dev, " io %d disabled\n", idx);
41 goto __add;
42 }
43
44 res->start = rule->min;
45 res->end = res->start + rule->size - 1;
46
47 while (!pnp_check_port(dev, res)) {
48 res->start += rule->align;
49 res->end = res->start + rule->size - 1;
50 if (res->start > rule->max || !rule->align) {
51 pnp_dbg(&dev->dev, " couldn't assign io %d "
52 "(min %#llx max %#llx)\n", idx,
53 (unsigned long long) rule->min,
54 (unsigned long long) rule->max);
55 return -EBUSY;
56 }
57 }
58
59 __add:
60 pnp_add_io_resource(dev, res->start, res->end, res->flags);
61 return 0;
62 }
63
pnp_assign_mem(struct pnp_dev * dev,struct pnp_mem * rule,int idx)64 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
65 {
66 struct resource *res, local_res;
67
68 res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
69 if (res) {
70 pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
71 "flags %#lx\n", idx, (unsigned long long) res->start,
72 (unsigned long long) res->end, res->flags);
73 return 0;
74 }
75
76 res = &local_res;
77 res->flags = rule->flags | IORESOURCE_AUTO;
78 res->start = 0;
79 res->end = 0;
80
81 if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
82 res->flags |= IORESOURCE_READONLY;
83 if (rule->flags & IORESOURCE_MEM_CACHEABLE)
84 res->flags |= IORESOURCE_CACHEABLE;
85 if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
86 res->flags |= IORESOURCE_RANGELENGTH;
87 if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
88 res->flags |= IORESOURCE_SHADOWABLE;
89
90 if (!rule->size) {
91 res->flags |= IORESOURCE_DISABLED;
92 pnp_dbg(&dev->dev, " mem %d disabled\n", idx);
93 goto __add;
94 }
95
96 res->start = rule->min;
97 res->end = res->start + rule->size - 1;
98
99 while (!pnp_check_mem(dev, res)) {
100 res->start += rule->align;
101 res->end = res->start + rule->size - 1;
102 if (res->start > rule->max || !rule->align) {
103 pnp_dbg(&dev->dev, " couldn't assign mem %d "
104 "(min %#llx max %#llx)\n", idx,
105 (unsigned long long) rule->min,
106 (unsigned long long) rule->max);
107 return -EBUSY;
108 }
109 }
110
111 __add:
112 pnp_add_mem_resource(dev, res->start, res->end, res->flags);
113 return 0;
114 }
115
pnp_assign_irq(struct pnp_dev * dev,struct pnp_irq * rule,int idx)116 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
117 {
118 struct resource *res, local_res;
119 int i;
120
121 /* IRQ priority: this table is good for i386 */
122 static unsigned short xtab[16] = {
123 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
124 };
125
126 res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
127 if (res) {
128 pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
129 idx, (int) res->start, res->flags);
130 return 0;
131 }
132
133 res = &local_res;
134 res->flags = rule->flags | IORESOURCE_AUTO;
135 res->start = -1;
136 res->end = -1;
137
138 if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
139 res->flags |= IORESOURCE_DISABLED;
140 pnp_dbg(&dev->dev, " irq %d disabled\n", idx);
141 goto __add;
142 }
143
144 /* TBD: need check for >16 IRQ */
145 res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
146 if (res->start < PNP_IRQ_NR) {
147 res->end = res->start;
148 goto __add;
149 }
150 for (i = 0; i < 16; i++) {
151 if (test_bit(xtab[i], rule->map.bits)) {
152 res->start = res->end = xtab[i];
153 if (pnp_check_irq(dev, res))
154 goto __add;
155 }
156 }
157
158 if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
159 res->start = -1;
160 res->end = -1;
161 res->flags |= IORESOURCE_DISABLED;
162 pnp_dbg(&dev->dev, " irq %d disabled (optional)\n", idx);
163 goto __add;
164 }
165
166 pnp_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
167 return -EBUSY;
168
169 __add:
170 pnp_add_irq_resource(dev, res->start, res->flags);
171 return 0;
172 }
173
174 #ifdef CONFIG_ISA_DMA_API
pnp_assign_dma(struct pnp_dev * dev,struct pnp_dma * rule,int idx)175 static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
176 {
177 struct resource *res, local_res;
178 int i;
179
180 /* DMA priority: this table is good for i386 */
181 static unsigned short xtab[8] = {
182 1, 3, 5, 6, 7, 0, 2, 4
183 };
184
185 res = pnp_get_resource(dev, IORESOURCE_DMA, idx);
186 if (res) {
187 pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
188 idx, (int) res->start, res->flags);
189 return 0;
190 }
191
192 res = &local_res;
193 res->flags = rule->flags | IORESOURCE_AUTO;
194 res->start = -1;
195 res->end = -1;
196
197 for (i = 0; i < 8; i++) {
198 if (rule->map & (1 << xtab[i])) {
199 res->start = res->end = xtab[i];
200 if (pnp_check_dma(dev, res))
201 goto __add;
202 }
203 }
204 #ifdef MAX_DMA_CHANNELS
205 res->start = res->end = MAX_DMA_CHANNELS;
206 #endif
207 res->flags |= IORESOURCE_DISABLED;
208 pnp_dbg(&dev->dev, " disable dma %d\n", idx);
209
210 __add:
211 pnp_add_dma_resource(dev, res->start, res->flags);
212 return 0;
213 }
214 #endif /* CONFIG_ISA_DMA_API */
215
pnp_init_resources(struct pnp_dev * dev)216 void pnp_init_resources(struct pnp_dev *dev)
217 {
218 pnp_free_resources(dev);
219 }
220
pnp_clean_resource_table(struct pnp_dev * dev)221 static void pnp_clean_resource_table(struct pnp_dev *dev)
222 {
223 struct pnp_resource *pnp_res, *tmp;
224
225 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
226 if (pnp_res->res.flags & IORESOURCE_AUTO)
227 pnp_free_resource(pnp_res);
228 }
229 }
230
231 /**
232 * pnp_assign_resources - assigns resources to the device based on the specified dependent number
233 * @dev: pointer to the desired device
234 * @set: the dependent function number
235 */
pnp_assign_resources(struct pnp_dev * dev,int set)236 static int pnp_assign_resources(struct pnp_dev *dev, int set)
237 {
238 struct pnp_option *option;
239 int nport = 0, nmem = 0, nirq = 0;
240 int ndma __maybe_unused = 0;
241 int ret = 0;
242
243 pnp_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
244 mutex_lock(&pnp_res_mutex);
245 pnp_clean_resource_table(dev);
246
247 list_for_each_entry(option, &dev->options, list) {
248 if (pnp_option_is_dependent(option) &&
249 pnp_option_set(option) != set)
250 continue;
251
252 switch (option->type) {
253 case IORESOURCE_IO:
254 ret = pnp_assign_port(dev, &option->u.port, nport++);
255 break;
256 case IORESOURCE_MEM:
257 ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
258 break;
259 case IORESOURCE_IRQ:
260 ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
261 break;
262 #ifdef CONFIG_ISA_DMA_API
263 case IORESOURCE_DMA:
264 ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
265 break;
266 #endif
267 default:
268 ret = -EINVAL;
269 break;
270 }
271 if (ret < 0)
272 break;
273 }
274
275 mutex_unlock(&pnp_res_mutex);
276 if (ret < 0) {
277 pnp_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
278 pnp_clean_resource_table(dev);
279 } else
280 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
281 return ret;
282 }
283
284 /**
285 * pnp_auto_config_dev - automatically assigns resources to a device
286 * @dev: pointer to the desired device
287 */
pnp_auto_config_dev(struct pnp_dev * dev)288 int pnp_auto_config_dev(struct pnp_dev *dev)
289 {
290 int i, ret;
291
292 if (!pnp_can_configure(dev)) {
293 pnp_dbg(&dev->dev, "configuration not supported\n");
294 return -ENODEV;
295 }
296
297 ret = pnp_assign_resources(dev, 0);
298 if (ret == 0)
299 return 0;
300
301 for (i = 1; i < dev->num_dependent_sets; i++) {
302 ret = pnp_assign_resources(dev, i);
303 if (ret == 0)
304 return 0;
305 }
306
307 dev_err(&dev->dev, "unable to assign resources\n");
308 return ret;
309 }
310
311 /**
312 * pnp_start_dev - low-level start of the PnP device
313 * @dev: pointer to the desired device
314 *
315 * assumes that resources have already been allocated
316 */
pnp_start_dev(struct pnp_dev * dev)317 int pnp_start_dev(struct pnp_dev *dev)
318 {
319 if (!pnp_can_write(dev)) {
320 pnp_dbg(&dev->dev, "activation not supported\n");
321 return -EINVAL;
322 }
323
324 dbg_pnp_show_resources(dev, "pnp_start_dev");
325 if (dev->protocol->set(dev) < 0) {
326 dev_err(&dev->dev, "activation failed\n");
327 return -EIO;
328 }
329
330 dev_info(&dev->dev, "activated\n");
331 return 0;
332 }
333
334 /**
335 * pnp_stop_dev - low-level disable of the PnP device
336 * @dev: pointer to the desired device
337 *
338 * does not free resources
339 */
pnp_stop_dev(struct pnp_dev * dev)340 int pnp_stop_dev(struct pnp_dev *dev)
341 {
342 if (!pnp_can_disable(dev)) {
343 pnp_dbg(&dev->dev, "disabling not supported\n");
344 return -EINVAL;
345 }
346 if (dev->protocol->disable(dev) < 0) {
347 dev_err(&dev->dev, "disable failed\n");
348 return -EIO;
349 }
350
351 dev_info(&dev->dev, "disabled\n");
352 return 0;
353 }
354
355 /**
356 * pnp_activate_dev - activates a PnP device for use
357 * @dev: pointer to the desired device
358 *
359 * does not validate or set resources so be careful.
360 */
pnp_activate_dev(struct pnp_dev * dev)361 int pnp_activate_dev(struct pnp_dev *dev)
362 {
363 int error;
364
365 if (dev->active)
366 return 0;
367
368 /* ensure resources are allocated */
369 if (pnp_auto_config_dev(dev))
370 return -EBUSY;
371
372 error = pnp_start_dev(dev);
373 if (error)
374 return error;
375
376 dev->active = 1;
377 return 0;
378 }
379
380 /**
381 * pnp_disable_dev - disables device
382 * @dev: pointer to the desired device
383 *
384 * inform the correct pnp protocol so that resources can be used by other devices
385 */
pnp_disable_dev(struct pnp_dev * dev)386 int pnp_disable_dev(struct pnp_dev *dev)
387 {
388 int error;
389
390 if (!dev->active)
391 return 0;
392
393 error = pnp_stop_dev(dev);
394 if (error)
395 return error;
396
397 dev->active = 0;
398
399 /* release the resources so that other devices can use them */
400 mutex_lock(&pnp_res_mutex);
401 pnp_clean_resource_table(dev);
402 mutex_unlock(&pnp_res_mutex);
403
404 return 0;
405 }
406
407 EXPORT_SYMBOL(pnp_start_dev);
408 EXPORT_SYMBOL(pnp_stop_dev);
409 EXPORT_SYMBOL(pnp_activate_dev);
410 EXPORT_SYMBOL(pnp_disable_dev);
411