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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/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}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/string.h>
3#include <linux/kernel.h>
4#include <linux/of.h>
5#include <linux/of_device.h>
6#include <linux/of_address.h>
7#include <linux/of_iommu.h>
8#include <linux/dma-mapping.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/mod_devicetable.h>
12#include <linux/slab.h>
13#include <linux/platform_device.h>
14
15#include <asm/errno.h>
16#include "of_private.h"
17
18/**
19 * of_match_device - Tell if a struct device matches an of_device_id list
20 * @matches: array of of device match structures to search in
21 * @dev: the of device structure to match against
22 *
23 * Used by a driver to check whether an platform_device present in the
24 * system is in its list of supported devices.
25 */
26const struct of_device_id *of_match_device(const struct of_device_id *matches,
27 const struct device *dev)
28{
29 if ((!matches) || (!dev->of_node))
30 return NULL;
31 return of_match_node(matches, dev->of_node);
32}
33EXPORT_SYMBOL(of_match_device);
34
35struct platform_device *of_dev_get(struct platform_device *dev)
36{
37 struct device *tmp;
38
39 if (!dev)
40 return NULL;
41 tmp = get_device(&dev->dev);
42 if (tmp)
43 return to_platform_device(tmp);
44 else
45 return NULL;
46}
47EXPORT_SYMBOL(of_dev_get);
48
49void of_dev_put(struct platform_device *dev)
50{
51 if (dev)
52 put_device(&dev->dev);
53}
54EXPORT_SYMBOL(of_dev_put);
55
56int of_device_add(struct platform_device *ofdev)
57{
58 BUG_ON(ofdev->dev.of_node == NULL);
59
60 /* name and id have to be set so that the platform bus doesn't get
61 * confused on matching */
62 ofdev->name = dev_name(&ofdev->dev);
63 ofdev->id = PLATFORM_DEVID_NONE;
64
65 /*
66 * If this device has not binding numa node in devicetree, that is
67 * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this
68 * device is on the same node as the parent.
69 */
70 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
71
72 return device_add(&ofdev->dev);
73}
74
75/**
76 * of_dma_configure - Setup DMA configuration
77 * @dev: Device to apply DMA configuration
78 * @np: Pointer to OF node having DMA configuration
79 * @force_dma: Whether device is to be set up by of_dma_configure() even if
80 * DMA capability is not explicitly described by firmware.
81 * @id: Optional const pointer value input id
82 *
83 * Try to get devices's DMA configuration from DT and update it
84 * accordingly.
85 *
86 * If platform code needs to use its own special DMA configuration, it
87 * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
88 * to fix up DMA configuration.
89 */
90int of_dma_configure_id(struct device *dev, struct device_node *np,
91 bool force_dma, const u32 *id)
92{
93 u64 dma_addr, paddr, size = 0;
94 int ret;
95 bool coherent;
96 unsigned long offset;
97 const struct iommu_ops *iommu;
98 u64 mask, end;
99
100 ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
101 if (ret < 0) {
102 /*
103 * For legacy reasons, we have to assume some devices need
104 * DMA configuration regardless of whether "dma-ranges" is
105 * correctly specified or not.
106 */
107 if (!force_dma)
108 return ret == -ENODEV ? 0 : ret;
109
110 dma_addr = offset = 0;
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 -EINVAL;
127 }
128 dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
129 }
130
131 /*
132 * If @dev is expected to be DMA-capable then the bus code that created
133 * it should have initialised its dma_mask pointer by this point. For
134 * now, we'll continue the legacy behaviour of coercing it to the
135 * coherent mask if not, but we'll no longer do so quietly.
136 */
137 if (!dev->dma_mask) {
138 dev_warn(dev, "DMA mask not set\n");
139 dev->dma_mask = &dev->coherent_dma_mask;
140 }
141
142 if (!size && dev->coherent_dma_mask)
143 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
144 else if (!size)
145 size = 1ULL << 32;
146
147 dev->dma_pfn_offset = offset;
148
149 /*
150 * Limit coherent and dma mask based on size and default mask
151 * set by the driver.
152 */
153 end = dma_addr + size - 1;
154 mask = DMA_BIT_MASK(ilog2(end) + 1);
155 dev->coherent_dma_mask &= mask;
156 *dev->dma_mask &= mask;
157 /* ...but only set bus limit if we found valid dma-ranges earlier */
158 if (!ret)
159 dev->bus_dma_limit = end;
160
161 coherent = of_dma_is_coherent(np);
162 dev_dbg(dev, "device is%sdma coherent\n",
163 coherent ? " " : " not ");
164
165 iommu = of_iommu_configure(dev, np, id);
166 if (PTR_ERR(iommu) == -EPROBE_DEFER)
167 return -EPROBE_DEFER;
168
169 dev_dbg(dev, "device is%sbehind an iommu\n",
170 iommu ? " " : " not ");
171
172 arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
173
174 return 0;
175}
176EXPORT_SYMBOL_GPL(of_dma_configure_id);
177
178int of_device_register(struct platform_device *pdev)
179{
180 device_initialize(&pdev->dev);
181 return of_device_add(pdev);
182}
183EXPORT_SYMBOL(of_device_register);
184
185void of_device_unregister(struct platform_device *ofdev)
186{
187 device_unregister(&ofdev->dev);
188}
189EXPORT_SYMBOL(of_device_unregister);
190
191const void *of_device_get_match_data(const struct device *dev)
192{
193 const struct of_device_id *match;
194
195 match = of_match_device(dev->driver->of_match_table, dev);
196 if (!match)
197 return NULL;
198
199 return match->data;
200}
201EXPORT_SYMBOL(of_device_get_match_data);
202
203static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
204{
205 const char *compat;
206 char *c;
207 struct property *p;
208 ssize_t csize;
209 ssize_t tsize;
210
211 if ((!dev) || (!dev->of_node))
212 return -ENODEV;
213
214 /* Name & Type */
215 /* %p eats all alphanum characters, so %c must be used here */
216 csize = snprintf(str, len, "of:N%pOFn%c%s", dev->of_node, 'T',
217 of_node_get_device_type(dev->of_node));
218 tsize = csize;
219 len -= csize;
220 if (str)
221 str += csize;
222
223 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
224 csize = strlen(compat) + 1;
225 tsize += csize;
226 if (csize > len)
227 continue;
228
229 csize = snprintf(str, len, "C%s", compat);
230 for (c = str; c; ) {
231 c = strchr(c, ' ');
232 if (c)
233 *c++ = '_';
234 }
235 len -= csize;
236 str += csize;
237 }
238
239 return tsize;
240}
241
242int of_device_request_module(struct device *dev)
243{
244 char *str;
245 ssize_t size;
246 int ret;
247
248 size = of_device_get_modalias(dev, NULL, 0);
249 if (size < 0)
250 return size;
251
252 str = kmalloc(size + 1, GFP_KERNEL);
253 if (!str)
254 return -ENOMEM;
255
256 of_device_get_modalias(dev, str, size);
257 str[size] = '\0';
258 ret = request_module(str);
259 kfree(str);
260
261 return ret;
262}
263EXPORT_SYMBOL_GPL(of_device_request_module);
264
265/**
266 * of_device_modalias - Fill buffer with newline terminated modalias string
267 */
268ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
269{
270 ssize_t sl = of_device_get_modalias(dev, str, len - 2);
271 if (sl < 0)
272 return sl;
273 if (sl > len - 2)
274 return -ENOMEM;
275
276 str[sl++] = '\n';
277 str[sl] = 0;
278 return sl;
279}
280EXPORT_SYMBOL_GPL(of_device_modalias);
281
282/**
283 * of_device_uevent - Display OF related uevent information
284 */
285void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
286{
287 const char *compat, *type;
288 struct alias_prop *app;
289 struct property *p;
290 int seen = 0;
291
292 if ((!dev) || (!dev->of_node))
293 return;
294
295 add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);
296 add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
297 type = of_node_get_device_type(dev->of_node);
298 if (type)
299 add_uevent_var(env, "OF_TYPE=%s", type);
300
301 /* Since the compatible field can contain pretty much anything
302 * it's not really legal to split it out with commas. We split it
303 * up using a number of environment variables instead. */
304 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
305 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
306 seen++;
307 }
308 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
309
310 seen = 0;
311 mutex_lock(&of_mutex);
312 list_for_each_entry(app, &aliases_lookup, link) {
313 if (dev->of_node == app->np) {
314 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
315 app->alias);
316 seen++;
317 }
318 }
319 mutex_unlock(&of_mutex);
320}
321
322int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
323{
324 int sl;
325
326 if ((!dev) || (!dev->of_node))
327 return -ENODEV;
328
329 /* Devicetree modalias is tricky, we add it in 2 steps */
330 if (add_uevent_var(env, "MODALIAS="))
331 return -ENOMEM;
332
333 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
334 sizeof(env->buf) - env->buflen);
335 if (sl >= (sizeof(env->buf) - env->buflen))
336 return -ENOMEM;
337 env->buflen += sl;
338
339 return 0;
340}
341EXPORT_SYMBOL_GPL(of_device_uevent_modalias);