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
96 	const struct iommu_ops *iommu;  in of_dma_configure_id()  local
97 	const struct bus_dma_region *map = NULL;  in of_dma_configure_id()  local
104 	if (np == dev->of_node)  in of_dma_configure_id()
109 	ret = of_dma_get_range(bus_np, &map);  in of_dma_configure_id()
114 		 * DMA configuration regardless of whether "dma-ranges" is  in of_dma_configure_id()
118 			return ret == -ENODEV ? 0 : ret;  in of_dma_configure_id()
120 		const struct bus_dma_region *r = map;  in of_dma_configure_id()
124 		for (dma_start = ~0; r->size; r++) {  in of_dma_configure_id()
126 			if (r->dma_start < dma_start)  in of_dma_configure_id()
127 				dma_start = r->dma_start;  in of_dma_configure_id()
128 			if (r->dma_start + r->size > dma_end)  in of_dma_configure_id()
129 				dma_end = r->dma_start + r->size;  in of_dma_configure_id()
131 		size = dma_end - dma_start;  in of_dma_configure_id()
138 			dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",  in of_dma_configure_id()
145 			kfree(map);  in of_dma_configure_id()
146 			return -EINVAL;  in of_dma_configure_id()
151 	 * If @dev is expected to be DMA-capable then the bus code that created  in of_dma_configure_id()
156 	if (!dev->dma_mask) {  in of_dma_configure_id()
158 		dev->dma_mask = &dev->coherent_dma_mask;  in of_dma_configure_id()
161 	if (!size && dev->coherent_dma_mask)  in of_dma_configure_id()
162 		size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);  in of_dma_configure_id()
170 	end = dma_start + size - 1;  in of_dma_configure_id()
172 	dev->coherent_dma_mask &= mask;  in of_dma_configure_id()
173 	*dev->dma_mask &= mask;  in of_dma_configure_id()
174 	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */  in of_dma_configure_id()
176 		dev->bus_dma_limit = end;  in of_dma_configure_id()
177 		dev->dma_range_map = map;  in of_dma_configure_id()
184 	iommu = of_iommu_configure(dev, np, id);  in of_dma_configure_id()
185 	if (PTR_ERR(iommu) == -EPROBE_DEFER) {  in of_dma_configure_id()
186 		/* Don't touch range map if it wasn't set from a valid dma-ranges */  in of_dma_configure_id()
188 			dev->dma_range_map = NULL;  in of_dma_configure_id()
189 		kfree(map);  in of_dma_configure_id()
190 		return -EPROBE_DEFER;  in of_dma_configure_id()
193 	dev_dbg(dev, "device is%sbehind an iommu\n",  in of_dma_configure_id()
194 		iommu ? " " : " not ");  in of_dma_configure_id()
196 	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);  in of_dma_configure_id()
198 	if (!iommu)  in of_dma_configure_id()
209 	match = of_match_device(dev->driver->of_match_table, dev);  in of_device_get_match_data()
213 	return match->data;  in of_device_get_match_data()
218  * of_device_modalias - Fill buffer with newline terminated modalias string
227 	if (!dev || !dev->of_node || dev->of_node_reused)  in of_device_modalias()
228 		return -ENODEV;  in of_device_modalias()
230 	sl = of_modalias(dev->of_node, str, len - 2);  in of_device_modalias()
233 	if (sl > len - 2)  in of_device_modalias()
234 		return -ENOMEM;  in of_device_modalias()
243  * of_device_uevent - Display OF related uevent information
254 	if ((!dev) || (!dev->of_node))  in of_device_uevent()
257 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);  in of_device_uevent()
258 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);  in of_device_uevent()
259 	type = of_node_get_device_type(dev->of_node);  in of_device_uevent()
266 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_uevent()
275 		if (dev->of_node == app->np) {  in of_device_uevent()
277 				       app->alias);  in of_device_uevent()
289 	if ((!dev) || (!dev->of_node) || dev->of_node_reused)  in of_device_uevent_modalias()
290 		return -ENODEV;  in of_device_uevent_modalias()
294 		return -ENOMEM;  in of_device_uevent_modalias()
296 	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],  in of_device_uevent_modalias()
297 			 sizeof(env->buf) - env->buflen);  in of_device_uevent_modalias()
300 	if (sl >= (sizeof(env->buf) - env->buflen))  in of_device_uevent_modalias()
301 		return -ENOMEM;  in of_device_uevent_modalias()
302 	env->buflen += sl;  in of_device_uevent_modalias()