1 #include <linux/string.h>
2 #include <linux/kernel.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>
13 #include <asm/errno.h>
14 #include "of_private.h"
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
21 * Used by a driver to check whether an platform_device present in the
22 * system is in its list of supported devices.
24 const struct of_device_id *of_match_device(const struct of_device_id *matches,
25 const struct device *dev)
27 if ((!matches) || (!dev->of_node))
29 return of_match_node(matches, dev->of_node);
31 EXPORT_SYMBOL(of_match_device);
33 struct platform_device *of_dev_get(struct platform_device *dev)
39 tmp = get_device(&dev->dev);
41 return to_platform_device(tmp);
45 EXPORT_SYMBOL(of_dev_get);
47 void of_dev_put(struct platform_device *dev)
50 put_device(&dev->dev);
52 EXPORT_SYMBOL(of_dev_put);
54 int of_device_add(struct platform_device *ofdev)
56 BUG_ON(ofdev->dev.of_node == NULL);
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 = PLATFORM_DEVID_NONE;
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.
68 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
70 return device_add(&ofdev->dev);
74 * of_dma_configure - Setup DMA configuration
75 * @dev: Device to apply DMA configuration
76 * @np: Pointer to OF node having DMA configuration
78 * Try to get devices's DMA configuration from DT and update it
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.
85 int of_dma_configure(struct device *dev, struct device_node *np)
87 u64 dma_addr, paddr, size;
91 const struct iommu_ops *iommu;
95 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
96 * setup the correct supported mask.
98 if (!dev->coherent_dma_mask)
99 dev->coherent_dma_mask = DMA_BIT_MASK(32);
102 * Set it to coherent_dma_mask by default if the architecture
103 * code has not set it.
106 dev->dma_mask = &dev->coherent_dma_mask;
108 ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
110 dma_addr = offset = 0;
111 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
113 offset = PFN_DOWN(paddr - dma_addr);
116 * Add a work around to treat the size as mask + 1 in case
117 * it is defined in DT as a mask.
120 dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
126 dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
129 dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
132 dev->dma_pfn_offset = offset;
135 * Limit coherent and dma mask based on size and default mask
138 mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
139 dev->coherent_dma_mask &= mask;
140 *dev->dma_mask &= mask;
142 coherent = of_dma_is_coherent(np);
143 dev_dbg(dev, "device is%sdma coherent\n",
144 coherent ? " " : " not ");
146 iommu = of_iommu_configure(dev, np);
147 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
148 return -EPROBE_DEFER;
150 dev_dbg(dev, "device is%sbehind an iommu\n",
151 iommu ? " " : " not ");
153 arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
157 EXPORT_SYMBOL_GPL(of_dma_configure);
160 * of_dma_deconfigure - Clean up DMA configuration
161 * @dev: Device for which to clean up DMA configuration
163 * Clean up all configuration performed by of_dma_configure_ops() and free all
164 * resources that have been allocated.
166 void of_dma_deconfigure(struct device *dev)
168 arch_teardown_dma_ops(dev);
171 int of_device_register(struct platform_device *pdev)
173 device_initialize(&pdev->dev);
174 return of_device_add(pdev);
176 EXPORT_SYMBOL(of_device_register);
178 void of_device_unregister(struct platform_device *ofdev)
180 device_unregister(&ofdev->dev);
182 EXPORT_SYMBOL(of_device_unregister);
184 const void *of_device_get_match_data(const struct device *dev)
186 const struct of_device_id *match;
188 match = of_match_device(dev->driver->of_match_table, dev);
194 EXPORT_SYMBOL(of_device_get_match_data);
196 static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
204 if ((!dev) || (!dev->of_node))
208 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
215 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
216 csize = strlen(compat) + 1;
221 csize = snprintf(str, len, "C%s", compat);
234 int of_device_request_module(struct device *dev)
240 size = of_device_get_modalias(dev, NULL, 0);
244 str = kmalloc(size + 1, GFP_KERNEL);
248 of_device_get_modalias(dev, str, size);
250 ret = request_module(str);
255 EXPORT_SYMBOL_GPL(of_device_request_module);
258 * of_device_modalias - Fill buffer with newline terminated modalias string
260 ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
262 ssize_t sl = of_device_get_modalias(dev, str, len - 2);
272 EXPORT_SYMBOL_GPL(of_device_modalias);
275 * of_device_uevent - Display OF related uevent information
277 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
280 struct alias_prop *app;
284 if ((!dev) || (!dev->of_node))
287 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
288 add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
289 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
290 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
292 /* Since the compatible field can contain pretty much anything
293 * it's not really legal to split it out with commas. We split it
294 * up using a number of environment variables instead. */
295 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
296 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
299 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
302 mutex_lock(&of_mutex);
303 list_for_each_entry(app, &aliases_lookup, link) {
304 if (dev->of_node == app->np) {
305 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
310 mutex_unlock(&of_mutex);
313 int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
317 if ((!dev) || (!dev->of_node))
320 /* Devicetree modalias is tricky, we add it in 2 steps */
321 if (add_uevent_var(env, "MODALIAS="))
324 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
325 sizeof(env->buf) - env->buflen);
326 if (sl >= (sizeof(env->buf) - env->buflen))
332 EXPORT_SYMBOL_GPL(of_device_uevent_modalias);