PNP: convert resource options to single linked list
[linux-2.6.git] / drivers / pnp / manager.c
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/slab.h>
16 #include <linux/bitmap.h>
17 #include <linux/mutex.h>
18 #include "base.h"
19
20 DEFINE_MUTEX(pnp_res_mutex);
21
22 static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
23 {
24         struct resource *res, local_res;
25
26         res = pnp_get_resource(dev, IORESOURCE_IO, idx);
27         if (res) {
28                 dev_dbg(&dev->dev, "  io %d already set to %#llx-%#llx "
29                         "flags %#lx\n", idx, (unsigned long long) res->start,
30                         (unsigned long long) res->end, res->flags);
31                 return 0;
32         }
33
34         res = &local_res;
35         res->flags = rule->flags | IORESOURCE_AUTO;
36         res->start = 0;
37         res->end = 0;
38
39         if (!rule->size) {
40                 res->flags |= IORESOURCE_DISABLED;
41                 dev_dbg(&dev->dev, "  io %d disabled\n", idx);
42                 goto __add;
43         }
44
45         res->start = rule->min;
46         res->end = res->start + rule->size - 1;
47
48         while (!pnp_check_port(dev, res)) {
49                 res->start += rule->align;
50                 res->end = res->start + rule->size - 1;
51                 if (res->start > rule->max || !rule->align) {
52                         dev_dbg(&dev->dev, "  couldn't assign io %d "
53                                 "(min %#llx max %#llx)\n", idx,
54                                 (unsigned long long) rule->min,
55                                 (unsigned long long) rule->max);
56                         return -EBUSY;
57                 }
58         }
59
60 __add:
61         pnp_add_io_resource(dev, res->start, res->end, res->flags);
62         return 0;
63 }
64
65 static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
66 {
67         struct resource *res, local_res;
68
69         res = pnp_get_resource(dev, IORESOURCE_MEM, idx);
70         if (res) {
71                 dev_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
72                         "flags %#lx\n", idx, (unsigned long long) res->start,
73                         (unsigned long long) res->end, res->flags);
74                 return 0;
75         }
76
77         res = &local_res;
78         res->flags = rule->flags | IORESOURCE_AUTO;
79         res->start = 0;
80         res->end = 0;
81
82         if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
83                 res->flags |= IORESOURCE_READONLY;
84         if (rule->flags & IORESOURCE_MEM_CACHEABLE)
85                 res->flags |= IORESOURCE_CACHEABLE;
86         if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
87                 res->flags |= IORESOURCE_RANGELENGTH;
88         if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
89                 res->flags |= IORESOURCE_SHADOWABLE;
90
91         if (!rule->size) {
92                 res->flags |= IORESOURCE_DISABLED;
93                 dev_dbg(&dev->dev, "  mem %d disabled\n", idx);
94                 goto __add;
95         }
96
97         res->start = rule->min;
98         res->end = res->start + rule->size - 1;
99
100         while (!pnp_check_mem(dev, res)) {
101                 res->start += rule->align;
102                 res->end = res->start + rule->size - 1;
103                 if (res->start > rule->max || !rule->align) {
104                         dev_dbg(&dev->dev, "  couldn't assign mem %d "
105                                 "(min %#llx max %#llx)\n", idx,
106                                 (unsigned long long) rule->min,
107                                 (unsigned long long) rule->max);
108                         return -EBUSY;
109                 }
110         }
111
112 __add:
113         pnp_add_mem_resource(dev, res->start, res->end, res->flags);
114         return 0;
115 }
116
117 static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
118 {
119         struct resource *res, local_res;
120         int i;
121
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
125         };
126
127         res = pnp_get_resource(dev, IORESOURCE_IRQ, idx);
128         if (res) {
129                 dev_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
130                         idx, (int) res->start, res->flags);
131                 return 0;
132         }
133
134         res = &local_res;
135         res->flags = rule->flags | IORESOURCE_AUTO;
136         res->start = -1;
137         res->end = -1;
138
139         if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
140                 res->flags |= IORESOURCE_DISABLED;
141                 dev_dbg(&dev->dev, "  irq %d disabled\n", idx);
142                 goto __add;
143         }
144
145         /* TBD: need check for >16 IRQ */
146         res->start = find_next_bit(rule->map.bits, PNP_IRQ_NR, 16);
147         if (res->start < PNP_IRQ_NR) {
148                 res->end = res->start;
149                 goto __add;
150         }
151         for (i = 0; i < 16; i++) {
152                 if (test_bit(xtab[i], rule->map.bits)) {
153                         res->start = res->end = xtab[i];
154                         if (pnp_check_irq(dev, res))
155                                 goto __add;
156                 }
157         }
158
159         if (rule->flags & IORESOURCE_IRQ_OPTIONAL) {
160                 res->start = -1;
161                 res->end = -1;
162                 res->flags |= IORESOURCE_DISABLED;
163                 dev_dbg(&dev->dev, "  irq %d disabled (optional)\n", idx);
164                 goto __add;
165         }
166
167         dev_dbg(&dev->dev, "  couldn't assign irq %d\n", idx);
168         return -EBUSY;
169
170 __add:
171         pnp_add_irq_resource(dev, res->start, res->flags);
172         return 0;
173 }
174
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                 dev_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         dev_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
215 void pnp_init_resources(struct pnp_dev *dev)
216 {
217         pnp_free_resources(dev);
218 }
219
220 static void pnp_clean_resource_table(struct pnp_dev *dev)
221 {
222         struct pnp_resource *pnp_res, *tmp;
223
224         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
225                 if (pnp_res->res.flags & IORESOURCE_AUTO)
226                         pnp_free_resource(pnp_res);
227         }
228 }
229
230 /**
231  * pnp_assign_resources - assigns resources to the device based on the specified dependent number
232  * @dev: pointer to the desired device
233  * @set: the dependent function number
234  */
235 static int pnp_assign_resources(struct pnp_dev *dev, int set)
236 {
237         struct pnp_option *option;
238         int nport = 0, nmem = 0, nirq = 0, ndma = 0;
239         int ret = 0;
240
241         dev_dbg(&dev->dev, "pnp_assign_resources, try dependent set %d\n", set);
242         mutex_lock(&pnp_res_mutex);
243         pnp_clean_resource_table(dev);
244
245         list_for_each_entry(option, &dev->options, list) {
246                 if (pnp_option_is_dependent(option) &&
247                     pnp_option_set(option) != set)
248                                 continue;
249
250                 switch (option->type) {
251                 case IORESOURCE_IO:
252                         ret = pnp_assign_port(dev, &option->u.port, nport++);
253                         break;
254                 case IORESOURCE_MEM:
255                         ret = pnp_assign_mem(dev, &option->u.mem, nmem++);
256                         break;
257                 case IORESOURCE_IRQ:
258                         ret = pnp_assign_irq(dev, &option->u.irq, nirq++);
259                         break;
260                 case IORESOURCE_DMA:
261                         ret = pnp_assign_dma(dev, &option->u.dma, ndma++);
262                         break;
263                 default:
264                         ret = -EINVAL;
265                         break;
266                 }
267                 if (ret < 0)
268                         break;
269         }
270
271         mutex_unlock(&pnp_res_mutex);
272         if (ret < 0) {
273                 dev_dbg(&dev->dev, "pnp_assign_resources failed (%d)\n", ret);
274                 pnp_clean_resource_table(dev);
275         } else
276                 dbg_pnp_show_resources(dev, "pnp_assign_resources succeeded");
277         return ret;
278 }
279
280 /**
281  * pnp_auto_config_dev - automatically assigns resources to a device
282  * @dev: pointer to the desired device
283  */
284 int pnp_auto_config_dev(struct pnp_dev *dev)
285 {
286         int i, ret;
287
288         if (!pnp_can_configure(dev)) {
289                 dev_dbg(&dev->dev, "configuration not supported\n");
290                 return -ENODEV;
291         }
292
293         ret = pnp_assign_resources(dev, 0);
294         if (ret == 0)
295                 return 0;
296
297         for (i = 1; i < dev->num_dependent_sets; i++) {
298                 ret = pnp_assign_resources(dev, i);
299                 if (ret == 0)
300                         return 0;
301         }
302
303         dev_err(&dev->dev, "unable to assign resources\n");
304         return ret;
305 }
306
307 /**
308  * pnp_start_dev - low-level start of the PnP device
309  * @dev: pointer to the desired device
310  *
311  * assumes that resources have already been allocated
312  */
313 int pnp_start_dev(struct pnp_dev *dev)
314 {
315         if (!pnp_can_write(dev)) {
316                 dev_dbg(&dev->dev, "activation not supported\n");
317                 return -EINVAL;
318         }
319
320         dbg_pnp_show_resources(dev, "pnp_start_dev");
321         if (dev->protocol->set(dev) < 0) {
322                 dev_err(&dev->dev, "activation failed\n");
323                 return -EIO;
324         }
325
326         dev_info(&dev->dev, "activated\n");
327         return 0;
328 }
329
330 /**
331  * pnp_stop_dev - low-level disable of the PnP device
332  * @dev: pointer to the desired device
333  *
334  * does not free resources
335  */
336 int pnp_stop_dev(struct pnp_dev *dev)
337 {
338         if (!pnp_can_disable(dev)) {
339                 dev_dbg(&dev->dev, "disabling not supported\n");
340                 return -EINVAL;
341         }
342         if (dev->protocol->disable(dev) < 0) {
343                 dev_err(&dev->dev, "disable failed\n");
344                 return -EIO;
345         }
346
347         dev_info(&dev->dev, "disabled\n");
348         return 0;
349 }
350
351 /**
352  * pnp_activate_dev - activates a PnP device for use
353  * @dev: pointer to the desired device
354  *
355  * does not validate or set resources so be careful.
356  */
357 int pnp_activate_dev(struct pnp_dev *dev)
358 {
359         int error;
360
361         if (dev->active)
362                 return 0;
363
364         /* ensure resources are allocated */
365         if (pnp_auto_config_dev(dev))
366                 return -EBUSY;
367
368         error = pnp_start_dev(dev);
369         if (error)
370                 return error;
371
372         dev->active = 1;
373         return 0;
374 }
375
376 /**
377  * pnp_disable_dev - disables device
378  * @dev: pointer to the desired device
379  *
380  * inform the correct pnp protocol so that resources can be used by other devices
381  */
382 int pnp_disable_dev(struct pnp_dev *dev)
383 {
384         int error;
385
386         if (!dev->active)
387                 return 0;
388
389         error = pnp_stop_dev(dev);
390         if (error)
391                 return error;
392
393         dev->active = 0;
394
395         /* release the resources so that other devices can use them */
396         mutex_lock(&pnp_res_mutex);
397         pnp_clean_resource_table(dev);
398         mutex_unlock(&pnp_res_mutex);
399
400         return 0;
401 }
402
403 EXPORT_SYMBOL(pnp_start_dev);
404 EXPORT_SYMBOL(pnp_stop_dev);
405 EXPORT_SYMBOL(pnp_activate_dev);
406 EXPORT_SYMBOL(pnp_disable_dev);