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1#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.h>
4#include <linux/of_device.h>
5#include <linux/of_address.h>
6#include <linux/of_iommu.h>
7#include <linux/dma-mapping.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/mod_devicetable.h>
11#include <linux/slab.h>
12
13#include <asm/errno.h>
14#include "of_private.h"
15
16/**
17 * of_match_device - Tell if a struct device matches an of_device_id list
18 * @ids: array of of device match structures to search in
19 * @dev: the of device structure to match against
20 *
21 * Used by a driver to check whether an platform_device present in the
22 * system is in its list of supported devices.
23 */
24const struct of_device_id *of_match_device(const struct of_device_id *matches,
25 const struct device *dev)
26{
27 if ((!matches) || (!dev->of_node))
28 return NULL;
29 return of_match_node(matches, dev->of_node);
30}
31EXPORT_SYMBOL(of_match_device);
32
33struct platform_device *of_dev_get(struct platform_device *dev)
34{
35 struct device *tmp;
36
37 if (!dev)
38 return NULL;
39 tmp = get_device(&dev->dev);
40 if (tmp)
41 return to_platform_device(tmp);
42 else
43 return NULL;
44}
45EXPORT_SYMBOL(of_dev_get);
46
47void of_dev_put(struct platform_device *dev)
48{
49 if (dev)
50 put_device(&dev->dev);
51}
52EXPORT_SYMBOL(of_dev_put);
53
54int of_device_add(struct platform_device *ofdev)
55{
56 BUG_ON(ofdev->dev.of_node == NULL);
57
58 /* name and id have to be set so that the platform bus doesn't get
59 * confused on matching */
60 ofdev->name = dev_name(&ofdev->dev);
61 ofdev->id = -1;
62
63 /*
64 * If this device has not binding numa node in devicetree, that is
65 * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this
66 * device is on the same node as the parent.
67 */
68 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
69
70 return device_add(&ofdev->dev);
71}
72
73/**
74 * of_dma_configure - Setup DMA configuration
75 * @dev: Device to apply DMA configuration
76 * @np: Pointer to OF node having DMA configuration
77 *
78 * Try to get devices's DMA configuration from DT and update it
79 * accordingly.
80 *
81 * If platform code needs to use its own special DMA configuration, it
82 * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
83 * to fix up DMA configuration.
84 */
85void of_dma_configure(struct device *dev, struct device_node *np)
86{
87 u64 dma_addr, paddr, size;
88 int ret;
89 bool coherent;
90 unsigned long offset;
91 struct iommu_ops *iommu;
92
93 /*
94 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
95 * setup the correct supported mask.
96 */
97 if (!dev->coherent_dma_mask)
98 dev->coherent_dma_mask = DMA_BIT_MASK(32);
99
100 /*
101 * Set it to coherent_dma_mask by default if the architecture
102 * code has not set it.
103 */
104 if (!dev->dma_mask)
105 dev->dma_mask = &dev->coherent_dma_mask;
106
107 ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
108 if (ret < 0) {
109 dma_addr = offset = 0;
110 size = dev->coherent_dma_mask + 1;
111 } else {
112 offset = PFN_DOWN(paddr - dma_addr);
113
114 /*
115 * Add a work around to treat the size as mask + 1 in case
116 * it is defined in DT as a mask.
117 */
118 if (size & 1) {
119 dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
120 size);
121 size = size + 1;
122 }
123
124 if (!size) {
125 dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
126 return;
127 }
128 dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
129 }
130
131 dev->dma_pfn_offset = offset;
132
133 /*
134 * Limit coherent and dma mask based on size and default mask
135 * set by the driver.
136 */
137 dev->coherent_dma_mask = min(dev->coherent_dma_mask,
138 DMA_BIT_MASK(ilog2(dma_addr + size)));
139 *dev->dma_mask = min((*dev->dma_mask),
140 DMA_BIT_MASK(ilog2(dma_addr + size)));
141
142 coherent = of_dma_is_coherent(np);
143 dev_dbg(dev, "device is%sdma coherent\n",
144 coherent ? " " : " not ");
145
146 iommu = of_iommu_configure(dev, np);
147 dev_dbg(dev, "device is%sbehind an iommu\n",
148 iommu ? " " : " not ");
149
150 arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
151}
152EXPORT_SYMBOL_GPL(of_dma_configure);
153
154int of_device_register(struct platform_device *pdev)
155{
156 device_initialize(&pdev->dev);
157 return of_device_add(pdev);
158}
159EXPORT_SYMBOL(of_device_register);
160
161void of_device_unregister(struct platform_device *ofdev)
162{
163 device_unregister(&ofdev->dev);
164}
165EXPORT_SYMBOL(of_device_unregister);
166
167const void *of_device_get_match_data(const struct device *dev)
168{
169 const struct of_device_id *match;
170
171 match = of_match_device(dev->driver->of_match_table, dev);
172 if (!match)
173 return NULL;
174
175 return match->data;
176}
177EXPORT_SYMBOL(of_device_get_match_data);
178
179ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
180{
181 const char *compat;
182 int cplen, i;
183 ssize_t tsize, csize, repend;
184
185 if ((!dev) || (!dev->of_node))
186 return -ENODEV;
187
188 /* Name & Type */
189 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
190 dev->of_node->type);
191
192 /* Get compatible property if any */
193 compat = of_get_property(dev->of_node, "compatible", &cplen);
194 if (!compat)
195 return csize;
196
197 /* Find true end (we tolerate multiple \0 at the end */
198 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
199 cplen--;
200 if (!cplen)
201 return csize;
202 cplen++;
203
204 /* Check space (need cplen+1 chars including final \0) */
205 tsize = csize + cplen;
206 repend = tsize;
207
208 if (csize >= len) /* @ the limit, all is already filled */
209 return tsize;
210
211 if (tsize >= len) { /* limit compat list */
212 cplen = len - csize - 1;
213 repend = len;
214 }
215
216 /* Copy and do char replacement */
217 memcpy(&str[csize + 1], compat, cplen);
218 for (i = csize; i < repend; i++) {
219 char c = str[i];
220 if (c == '\0')
221 str[i] = 'C';
222 else if (c == ' ')
223 str[i] = '_';
224 }
225
226 return tsize;
227}
228
229/**
230 * of_device_uevent - Display OF related uevent information
231 */
232void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
233{
234 const char *compat;
235 struct alias_prop *app;
236 int seen = 0, cplen, sl;
237
238 if ((!dev) || (!dev->of_node))
239 return;
240
241 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
242 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
243 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
244 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
245
246 /* Since the compatible field can contain pretty much anything
247 * it's not really legal to split it out with commas. We split it
248 * up using a number of environment variables instead. */
249 compat = of_get_property(dev->of_node, "compatible", &cplen);
250 while (compat && *compat && cplen > 0) {
251 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
252 sl = strlen(compat) + 1;
253 compat += sl;
254 cplen -= sl;
255 seen++;
256 }
257 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
258
259 seen = 0;
260 mutex_lock(&of_mutex);
261 list_for_each_entry(app, &aliases_lookup, link) {
262 if (dev->of_node == app->np) {
263 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
264 app->alias);
265 seen++;
266 }
267 }
268 mutex_unlock(&of_mutex);
269}
270
271int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
272{
273 int sl;
274
275 if ((!dev) || (!dev->of_node))
276 return -ENODEV;
277
278 /* Devicetree modalias is tricky, we add it in 2 steps */
279 if (add_uevent_var(env, "MODALIAS="))
280 return -ENOMEM;
281
282 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
283 sizeof(env->buf) - env->buflen);
284 if (sl >= (sizeof(env->buf) - env->buflen))
285 return -ENOMEM;
286 env->buflen += sl;
287
288 return 0;
289}
1#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.h>
4#include <linux/of_device.h>
5#include <linux/init.h>
6#include <linux/module.h>
7#include <linux/mod_devicetable.h>
8#include <linux/slab.h>
9
10#include <asm/errno.h>
11#include "of_private.h"
12
13/**
14 * of_match_device - Tell if a struct device matches an of_device_id list
15 * @ids: array of of device match structures to search in
16 * @dev: the of device structure to match against
17 *
18 * Used by a driver to check whether an platform_device present in the
19 * system is in its list of supported devices.
20 */
21const struct of_device_id *of_match_device(const struct of_device_id *matches,
22 const struct device *dev)
23{
24 if ((!matches) || (!dev->of_node))
25 return NULL;
26 return of_match_node(matches, dev->of_node);
27}
28EXPORT_SYMBOL(of_match_device);
29
30struct platform_device *of_dev_get(struct platform_device *dev)
31{
32 struct device *tmp;
33
34 if (!dev)
35 return NULL;
36 tmp = get_device(&dev->dev);
37 if (tmp)
38 return to_platform_device(tmp);
39 else
40 return NULL;
41}
42EXPORT_SYMBOL(of_dev_get);
43
44void of_dev_put(struct platform_device *dev)
45{
46 if (dev)
47 put_device(&dev->dev);
48}
49EXPORT_SYMBOL(of_dev_put);
50
51int of_device_add(struct platform_device *ofdev)
52{
53 BUG_ON(ofdev->dev.of_node == NULL);
54
55 /* name and id have to be set so that the platform bus doesn't get
56 * confused on matching */
57 ofdev->name = dev_name(&ofdev->dev);
58 ofdev->id = -1;
59
60 /* device_add will assume that this device is on the same node as
61 * the parent. If there is no parent defined, set the node
62 * explicitly */
63 if (!ofdev->dev.parent)
64 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
65
66 return device_add(&ofdev->dev);
67}
68
69int of_device_register(struct platform_device *pdev)
70{
71 device_initialize(&pdev->dev);
72 return of_device_add(pdev);
73}
74EXPORT_SYMBOL(of_device_register);
75
76void of_device_unregister(struct platform_device *ofdev)
77{
78 device_unregister(&ofdev->dev);
79}
80EXPORT_SYMBOL(of_device_unregister);
81
82ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
83{
84 const char *compat;
85 int cplen, i;
86 ssize_t tsize, csize, repend;
87
88 if ((!dev) || (!dev->of_node))
89 return -ENODEV;
90
91 /* Name & Type */
92 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
93 dev->of_node->type);
94
95 /* Get compatible property if any */
96 compat = of_get_property(dev->of_node, "compatible", &cplen);
97 if (!compat)
98 return csize;
99
100 /* Find true end (we tolerate multiple \0 at the end */
101 for (i = (cplen - 1); i >= 0 && !compat[i]; i--)
102 cplen--;
103 if (!cplen)
104 return csize;
105 cplen++;
106
107 /* Check space (need cplen+1 chars including final \0) */
108 tsize = csize + cplen;
109 repend = tsize;
110
111 if (csize >= len) /* @ the limit, all is already filled */
112 return tsize;
113
114 if (tsize >= len) { /* limit compat list */
115 cplen = len - csize - 1;
116 repend = len;
117 }
118
119 /* Copy and do char replacement */
120 memcpy(&str[csize + 1], compat, cplen);
121 for (i = csize; i < repend; i++) {
122 char c = str[i];
123 if (c == '\0')
124 str[i] = 'C';
125 else if (c == ' ')
126 str[i] = '_';
127 }
128
129 return tsize;
130}
131
132/**
133 * of_device_uevent - Display OF related uevent information
134 */
135void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
136{
137 const char *compat;
138 struct alias_prop *app;
139 int seen = 0, cplen, sl;
140
141 if ((!dev) || (!dev->of_node))
142 return;
143
144 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
145 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
146 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
147 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
148
149 /* Since the compatible field can contain pretty much anything
150 * it's not really legal to split it out with commas. We split it
151 * up using a number of environment variables instead. */
152 compat = of_get_property(dev->of_node, "compatible", &cplen);
153 while (compat && *compat && cplen > 0) {
154 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
155 sl = strlen(compat) + 1;
156 compat += sl;
157 cplen -= sl;
158 seen++;
159 }
160 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
161
162 seen = 0;
163 mutex_lock(&of_aliases_mutex);
164 list_for_each_entry(app, &aliases_lookup, link) {
165 if (dev->of_node == app->np) {
166 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
167 app->alias);
168 seen++;
169 }
170 }
171 mutex_unlock(&of_aliases_mutex);
172}
173
174int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
175{
176 int sl;
177
178 if ((!dev) || (!dev->of_node))
179 return -ENODEV;
180
181 /* Devicetree modalias is tricky, we add it in 2 steps */
182 if (add_uevent_var(env, "MODALIAS="))
183 return -ENOMEM;
184
185 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
186 sizeof(env->buf) - env->buflen);
187 if (sl >= (sizeof(env->buf) - env->buflen))
188 return -ENOMEM;
189 env->buflen += sl;
190
191 return 0;
192}