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 *of_node = dev->of_node;  in of_dma_set_restricted_buffer()
46 	 * If dev->of_node doesn't exist or doesn't contain memory-region, try  in of_dma_set_restricted_buffer()
49 	if (!of_property_present(of_node, "memory-region"))  in of_dma_set_restricted_buffer()
52 	of_for_each_phandle(&it, rc, of_node, "memory-region", NULL, 0) {  in of_dma_set_restricted_buffer()
55 		 * restricted-dma-pool region is allowed.  in of_dma_set_restricted_buffer()
57 		if (of_device_is_compatible(it.node, "restricted-dma-pool") &&  in of_dma_set_restricted_buffer()
60 				dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");  in of_dma_set_restricted_buffer()
70  * of_dma_configure_id - Setup DMA configuration
87 	const struct bus_dma_region *map = NULL;  in of_dma_configure_id()  local
89 	u64 mask, end = 0;  in of_dma_configure_id()  local
93 	if (dev->dma_range_map) {  in of_dma_configure_id()
98 	if (np == dev->of_node)  in of_dma_configure_id()
103 	ret = of_dma_get_range(bus_np, &map);  in of_dma_configure_id()
108 		 * DMA configuration regardless of whether "dma-ranges" is  in of_dma_configure_id()
112 			return ret == -ENODEV ? 0 : ret;  in of_dma_configure_id()
115 		end = dma_range_map_max(map);  in of_dma_configure_id()
120 	 * If @dev is expected to be DMA-capable then the bus code that created  in of_dma_configure_id()
123 	 * coherent mask if not, but we'll no longer do so quietly.  in of_dma_configure_id()
125 	if (!dev->dma_mask) {  in of_dma_configure_id()
126 		dev_warn(dev, "DMA mask not set\n");  in of_dma_configure_id()
127 		dev->dma_mask = &dev->coherent_dma_mask;  in of_dma_configure_id()
130 	if (!end && dev->coherent_dma_mask)  in of_dma_configure_id()
131 		end = dev->coherent_dma_mask;  in of_dma_configure_id()
133 		end = (1ULL << 32) - 1;  in of_dma_configure_id()
136 	 * Limit coherent and dma mask based on size and default mask  in of_dma_configure_id()
139 	mask = DMA_BIT_MASK(ilog2(end) + 1);  in of_dma_configure_id()
140 	dev->coherent_dma_mask &= mask;  in of_dma_configure_id()
141 	*dev->dma_mask &= mask;  in of_dma_configure_id()
142 	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */  in of_dma_configure_id()
144 		dev->bus_dma_limit = end;  in of_dma_configure_id()
145 		dev->dma_range_map = map;  in of_dma_configure_id()
153 	if (ret == -EPROBE_DEFER) {  in of_dma_configure_id()
154 		/* Don't touch range map if it wasn't set from a valid dma-ranges */  in of_dma_configure_id()
156 			dev->dma_range_map = NULL;  in of_dma_configure_id()
157 		kfree(map);  in of_dma_configure_id()
158 		return -EPROBE_DEFER;  in of_dma_configure_id()
160 	/* Take all other IOMMU errors to mean we'll just carry on without it */  in of_dma_configure_id()
161 	dev_dbg(dev, "device is%sbehind an iommu\n",  in of_dma_configure_id()
177 	match = of_match_device(dev->driver->of_match_table, dev);  in of_device_get_match_data()
181 	return match->data;  in of_device_get_match_data()
186  * of_device_modalias - Fill buffer with newline terminated modalias string
195 	if (!dev || !dev->of_node || dev->of_node_reused)  in of_device_modalias()
196 		return -ENODEV;  in of_device_modalias()
198 	sl = of_modalias(dev->of_node, str, len - 2);  in of_device_modalias()
201 	if (sl > len - 2)  in of_device_modalias()
202 		return -ENOMEM;  in of_device_modalias()
211  * of_device_uevent - Display OF related uevent information
222 	if ((!dev) || (!dev->of_node))  in of_device_uevent()
225 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);  in of_device_uevent()
226 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);  in of_device_uevent()
227 	type = of_node_get_device_type(dev->of_node);  in of_device_uevent()
234 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_uevent()
243 		if (dev->of_node == app->np) {  in of_device_uevent()
245 				       app->alias);  in of_device_uevent()
257 	if ((!dev) || (!dev->of_node) || dev->of_node_reused)  in of_device_uevent_modalias()
258 		return -ENODEV;  in of_device_uevent_modalias()
262 		return -ENOMEM;  in of_device_uevent_modalias()
264 	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],  in of_device_uevent_modalias()
265 			 sizeof(env->buf) - env->buflen);  in of_device_uevent_modalias()
268 	if (sl >= (sizeof(env->buf) - env->buflen))  in of_device_uevent_modalias()
269 		return -ENOMEM;  in of_device_uevent_modalias()
270 	env->buflen += sl;  in of_device_uevent_modalias()
277  * of_device_make_bus_id - Use the device node data to assign a unique name
286 	struct device_node *node = dev->of_node;  in of_device_make_bus_id()
289 	u32 mask;  in of_device_make_bus_id()  local
292 	while (node->parent) {  in of_device_make_bus_id()
299 			if (!of_property_read_u32(node, "mask", &mask))  in of_device_make_bus_id()
301 					     addr, ffs(mask) - 1, node, dev_name(dev));  in of_device_make_bus_id()
311 			     kbasename(node->full_name), dev_name(dev));  in of_device_make_bus_id()
312 		node = node->parent;  in of_device_make_bus_id()