Root/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/bitmap.h>
16#include <linux/mutex.h>
17#include "base.h"
18
19DEFINE_MUTEX(pnp_res_mutex);
20
21static 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
64static 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
116static 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
175static 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
216void pnp_init_resources(struct pnp_dev *dev)
217{
218    pnp_free_resources(dev);
219}
220
221static 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 */
236static 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 */
288int 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 */
317int 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 */
340int 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 */
361int 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 */
386int 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
407EXPORT_SYMBOL(pnp_start_dev);
408EXPORT_SYMBOL(pnp_stop_dev);
409EXPORT_SYMBOL(pnp_activate_dev);
410EXPORT_SYMBOL(pnp_disable_dev);
411

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