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>
12 #include <linux/pci.h>
13 #include <linux/platform_device.h>
14 #include <linux/amba/bus.h>
16 #include <asm/errno.h>
17 #include "of_private.h"
20 * of_match_device - Tell if a struct device matches an of_device_id list
21 * @ids: array of of device match structures to search in
22 * @dev: the of device structure to match against
24 * Used by a driver to check whether an platform_device present in the
25 * system is in its list of supported devices.
27 const struct of_device_id *of_match_device(const struct of_device_id *matches,
28 const struct device *dev)
30 if ((!matches) || (!dev->of_node))
32 return of_match_node(matches, dev->of_node);
34 EXPORT_SYMBOL(of_match_device);
36 struct platform_device *of_dev_get(struct platform_device *dev)
42 tmp = get_device(&dev->dev);
44 return to_platform_device(tmp);
48 EXPORT_SYMBOL(of_dev_get);
50 void of_dev_put(struct platform_device *dev)
53 put_device(&dev->dev);
55 EXPORT_SYMBOL(of_dev_put);
57 int of_device_add(struct platform_device *ofdev)
59 BUG_ON(ofdev->dev.of_node == NULL);
61 /* name and id have to be set so that the platform bus doesn't get
62 * confused on matching */
63 ofdev->name = dev_name(&ofdev->dev);
64 ofdev->id = PLATFORM_DEVID_NONE;
67 * If this device has not binding numa node in devicetree, that is
68 * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this
69 * device is on the same node as the parent.
71 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
73 return device_add(&ofdev->dev);
77 * of_dma_configure - Setup DMA configuration
78 * @dev: Device to apply DMA configuration
79 * @np: Pointer to OF node having DMA configuration
81 * Try to get devices's DMA configuration from DT and update it
84 * If platform code needs to use its own special DMA configuration, it
85 * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
86 * to fix up DMA configuration.
88 int of_dma_configure(struct device *dev, struct device_node *np)
90 u64 dma_addr, paddr, size = 0;
94 const struct iommu_ops *iommu;
97 ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
100 * For legacy reasons, we have to assume some devices need
101 * DMA configuration regardless of whether "dma-ranges" is
102 * correctly specified or not.
104 if (!dev_is_pci(dev) &&
105 #ifdef CONFIG_ARM_AMBA
106 dev->bus != &amba_bustype &&
108 dev->bus != &platform_bus_type)
109 return ret == -ENODEV ? 0 : ret;
111 dma_addr = offset = 0;
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);
133 * Set default coherent_dma_mask to 32 bit. Drivers are expected to
134 * setup the correct supported mask.
136 if (!dev->coherent_dma_mask)
137 dev->coherent_dma_mask = DMA_BIT_MASK(32);
139 * Set it to coherent_dma_mask by default if the architecture
140 * code has not set it.
143 dev->dma_mask = &dev->coherent_dma_mask;
146 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
148 dev->dma_pfn_offset = offset;
151 * Limit coherent and dma mask based on size and default mask
154 mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
155 dev->coherent_dma_mask &= mask;
156 *dev->dma_mask &= mask;
158 coherent = of_dma_is_coherent(np);
159 dev_dbg(dev, "device is%sdma coherent\n",
160 coherent ? " " : " not ");
162 iommu = of_iommu_configure(dev, np);
163 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
164 return -EPROBE_DEFER;
166 dev_dbg(dev, "device is%sbehind an iommu\n",
167 iommu ? " " : " not ");
169 arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
173 EXPORT_SYMBOL_GPL(of_dma_configure);
176 * of_dma_deconfigure - Clean up DMA configuration
177 * @dev: Device for which to clean up DMA configuration
179 * Clean up all configuration performed by of_dma_configure_ops() and free all
180 * resources that have been allocated.
182 void of_dma_deconfigure(struct device *dev)
184 arch_teardown_dma_ops(dev);
187 int of_device_register(struct platform_device *pdev)
189 device_initialize(&pdev->dev);
190 return of_device_add(pdev);
192 EXPORT_SYMBOL(of_device_register);
194 void of_device_unregister(struct platform_device *ofdev)
196 device_unregister(&ofdev->dev);
198 EXPORT_SYMBOL(of_device_unregister);
200 const void *of_device_get_match_data(const struct device *dev)
202 const struct of_device_id *match;
204 match = of_match_device(dev->driver->of_match_table, dev);
210 EXPORT_SYMBOL(of_device_get_match_data);
212 static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
220 if ((!dev) || (!dev->of_node))
224 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
231 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
232 csize = strlen(compat) + 1;
237 csize = snprintf(str, len, "C%s", compat);
250 int of_device_request_module(struct device *dev)
256 size = of_device_get_modalias(dev, NULL, 0);
260 str = kmalloc(size + 1, GFP_KERNEL);
264 of_device_get_modalias(dev, str, size);
266 ret = request_module(str);
271 EXPORT_SYMBOL_GPL(of_device_request_module);
274 * of_device_modalias - Fill buffer with newline terminated modalias string
276 ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
278 ssize_t sl = of_device_get_modalias(dev, str, len - 2);
288 EXPORT_SYMBOL_GPL(of_device_modalias);
291 * of_device_uevent - Display OF related uevent information
293 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
296 struct alias_prop *app;
300 if ((!dev) || (!dev->of_node))
303 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
304 add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
305 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
306 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
308 /* Since the compatible field can contain pretty much anything
309 * it's not really legal to split it out with commas. We split it
310 * up using a number of environment variables instead. */
311 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
312 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
315 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
318 mutex_lock(&of_mutex);
319 list_for_each_entry(app, &aliases_lookup, link) {
320 if (dev->of_node == app->np) {
321 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
326 mutex_unlock(&of_mutex);
329 int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
333 if ((!dev) || (!dev->of_node))
336 /* Devicetree modalias is tricky, we add it in 2 steps */
337 if (add_uevent_var(env, "MODALIAS="))
340 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
341 sizeof(env->buf) - env->buflen);
342 if (sl >= (sizeof(env->buf) - env->buflen))
348 EXPORT_SYMBOL_GPL(of_device_uevent_modalias);