1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/dma-direct.h> /* for bus_dma_region */
9 #include <linux/dma-map-ops.h>
19  * of_match_device - Tell if a struct device matches an of_device_id list
29 	if (!matches || !dev->of_node || dev->of_node_reused)  in of_match_device()
31 	return of_match_node(matches, dev->of_node);  in of_match_device()
38 	struct device_node *node, *of_node = dev->of_node;  in of_dma_set_restricted_buffer()
44 	count = of_property_count_elems_of_size(of_node, "memory-region",  in of_dma_set_restricted_buffer()
47 	 * If dev->of_node doesn't exist or doesn't contain memory-region, try  in of_dma_set_restricted_buffer()
53 			of_node, "memory-region", sizeof(u32));  in of_dma_set_restricted_buffer()
57 		node = of_parse_phandle(of_node, "memory-region", i);  in of_dma_set_restricted_buffer()
60 		 * restricted-dma-pool region is allowed.  in of_dma_set_restricted_buffer()
62 		if (of_device_is_compatible(node, "restricted-dma-pool") &&  in of_dma_set_restricted_buffer()
71 	 * Attempt to initialize a restricted-dma-pool region if one was found.  in of_dma_set_restricted_buffer()
75 		dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");  in of_dma_set_restricted_buffer()
79  * of_dma_configure_id - Setup DMA configuration
83  *		DMA capability is not explicitly described by firmware.
102 	if (dev->dma_range_map) {  in of_dma_configure_id()
107 	if (np == dev->of_node)  in of_dma_configure_id()
117 		 * DMA configuration regardless of whether "dma-ranges" is  in of_dma_configure_id()
121 			return ret == -ENODEV ? 0 : ret;  in of_dma_configure_id()
129 	 * If @dev is expected to be DMA-capable then the bus code that created  in of_dma_configure_id()
130 	 * it should have initialised its dma_mask pointer by this point. For  in of_dma_configure_id()
134 	if (!dev->dma_mask) {  in of_dma_configure_id()
136 		dev->dma_mask = &dev->coherent_dma_mask;  in of_dma_configure_id()
139 	if (!end && dev->coherent_dma_mask)  in of_dma_configure_id()
140 		end = dev->coherent_dma_mask;  in of_dma_configure_id()
142 		end = (1ULL << 32) - 1;  in of_dma_configure_id()
149 	dev->coherent_dma_mask &= mask;  in of_dma_configure_id()
150 	*dev->dma_mask &= mask;  in of_dma_configure_id()
151 	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */  in of_dma_configure_id()
153 		dev->bus_dma_limit = end;  in of_dma_configure_id()
154 		dev->dma_range_map = map;  in of_dma_configure_id()
162 	if (ret == -EPROBE_DEFER) {  in of_dma_configure_id()
163 		/* Don't touch range map if it wasn't set from a valid dma-ranges */  in of_dma_configure_id()
165 			dev->dma_range_map = NULL;  in of_dma_configure_id()
167 		return -EPROBE_DEFER;  in of_dma_configure_id()
186 	match = of_match_device(dev->driver->of_match_table, dev);  in of_device_get_match_data()
190 	return match->data;  in of_device_get_match_data()
195  * of_device_modalias - Fill buffer with newline terminated modalias string
204 	if (!dev || !dev->of_node || dev->of_node_reused)  in of_device_modalias()
205 		return -ENODEV;  in of_device_modalias()
207 	sl = of_modalias(dev->of_node, str, len - 2);  in of_device_modalias()
210 	if (sl > len - 2)  in of_device_modalias()
211 		return -ENOMEM;  in of_device_modalias()
220  * of_device_uevent - Display OF related uevent information
231 	if ((!dev) || (!dev->of_node))  in of_device_uevent()
234 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);  in of_device_uevent()
235 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);  in of_device_uevent()
236 	type = of_node_get_device_type(dev->of_node);  in of_device_uevent()
243 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_uevent()
252 		if (dev->of_node == app->np) {  in of_device_uevent()
254 				       app->alias);  in of_device_uevent()
266 	if ((!dev) || (!dev->of_node) || dev->of_node_reused)  in of_device_uevent_modalias()
267 		return -ENODEV;  in of_device_uevent_modalias()
271 		return -ENOMEM;  in of_device_uevent_modalias()
273 	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],  in of_device_uevent_modalias()
274 			 sizeof(env->buf) - env->buflen);  in of_device_uevent_modalias()
277 	if (sl >= (sizeof(env->buf) - env->buflen))  in of_device_uevent_modalias()
278 		return -ENOMEM;  in of_device_uevent_modalias()
279 	env->buflen += sl;  in of_device_uevent_modalias()
286  * of_device_make_bus_id - Use the device node data to assign a unique name
295 	struct device_node *node = dev->of_node;  in of_device_make_bus_id()
301 	while (node->parent) {  in of_device_make_bus_id()
310 					     addr, ffs(mask) - 1, node, dev_name(dev));  in of_device_make_bus_id()
320 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
321 		node = node->parent;  in of_device_make_bus_id()