1 // SPDX-License-Identifier: GPL-2.0
9 #include <linux/dma-direct.h> /* for bus_dma_region */
10 #include <linux/dma-map-ops.h>
21  * of_match_device - Tell if a struct device matches an of_device_id list
31 	if ((!matches) || (!dev->of_node))  in of_match_device()
33 	return of_match_node(matches, dev->of_node);  in of_match_device()
39 	BUG_ON(ofdev->dev.of_node == NULL);  in of_device_add()
43 	ofdev->name = dev_name(&ofdev->dev);  in of_device_add()
44 	ofdev->id = PLATFORM_DEVID_NONE;  in of_device_add()
51 	set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));  in of_device_add()
53 	return device_add(&ofdev->dev);  in of_device_add()
59 	struct device_node *node, *of_node = dev->of_node;  in of_dma_set_restricted_buffer()
65 	count = of_property_count_elems_of_size(of_node, "memory-region",  in of_dma_set_restricted_buffer()
68 	 * If dev->of_node doesn't exist or doesn't contain memory-region, try  in of_dma_set_restricted_buffer()
69 	 * the OF node having DMA configuration.  in of_dma_set_restricted_buffer()
74 			of_node, "memory-region", sizeof(u32));  in of_dma_set_restricted_buffer()
78 		node = of_parse_phandle(of_node, "memory-region", i);  in of_dma_set_restricted_buffer()
81 		 * restricted-dma-pool region is allowed.  in of_dma_set_restricted_buffer()
83 		if (of_device_is_compatible(node, "restricted-dma-pool") &&  in of_dma_set_restricted_buffer()
89 	 * Attempt to initialize a restricted-dma-pool region if one was found.  in of_dma_set_restricted_buffer()
93 		dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");  in of_dma_set_restricted_buffer()
97  * of_dma_configure_id - Setup DMA configuration
98  * @dev:	Device to apply DMA configuration
99  * @np:		Pointer to OF node having DMA configuration
101  *		DMA capability is not explicitly described by firmware.
104  * Try to get devices's DMA configuration from DT and update it
107  * If platform code needs to use its own special DMA configuration, it
109  * to fix up DMA configuration.
118 	bool coherent;  in of_dma_configure_id()  local
125 		 * DMA configuration regardless of whether "dma-ranges" is  in of_dma_configure_id()
129 			return ret == -ENODEV ? 0 : ret;  in of_dma_configure_id()
134 		/* Determine the overall bounds of all DMA regions */  in of_dma_configure_id()
135 		for (dma_start = ~0; r->size; r++) {  in of_dma_configure_id()
137 			if (r->dma_start < dma_start)  in of_dma_configure_id()
138 				dma_start = r->dma_start;  in of_dma_configure_id()
139 			if (r->dma_start + r->size > dma_end)  in of_dma_configure_id()
140 				dma_end = r->dma_start + r->size;  in of_dma_configure_id()
142 		size = dma_end - dma_start;  in of_dma_configure_id()
149 			dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",  in of_dma_configure_id()
157 			return -EINVAL;  in of_dma_configure_id()
162 	 * If @dev is expected to be DMA-capable then the bus code that created  in of_dma_configure_id()
165 	 * coherent mask if not, but we'll no longer do so quietly.  in of_dma_configure_id()
167 	if (!dev->dma_mask) {  in of_dma_configure_id()
168 		dev_warn(dev, "DMA mask not set\n");  in of_dma_configure_id()
169 		dev->dma_mask = &dev->coherent_dma_mask;  in of_dma_configure_id()
172 	if (!size && dev->coherent_dma_mask)  in of_dma_configure_id()
173 		size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);  in of_dma_configure_id()
178 	 * Limit coherent and dma mask based on size and default mask  in of_dma_configure_id()
181 	end = dma_start + size - 1;  in of_dma_configure_id()
183 	dev->coherent_dma_mask &= mask;  in of_dma_configure_id()
184 	*dev->dma_mask &= mask;  in of_dma_configure_id()
185 	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */  in of_dma_configure_id()
187 		dev->bus_dma_limit = end;  in of_dma_configure_id()
188 		dev->dma_range_map = map;  in of_dma_configure_id()
191 	coherent = of_dma_is_coherent(np);  in of_dma_configure_id()
192 	dev_dbg(dev, "device is%sdma coherent\n",  in of_dma_configure_id()
193 		coherent ? " " : " not ");  in of_dma_configure_id()
196 	if (PTR_ERR(iommu) == -EPROBE_DEFER) {  in of_dma_configure_id()
197 		/* Don't touch range map if it wasn't set from a valid dma-ranges */  in of_dma_configure_id()
199 			dev->dma_range_map = NULL;  in of_dma_configure_id()
201 		return -EPROBE_DEFER;  in of_dma_configure_id()
207 	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);  in of_dma_configure_id()
218 	device_initialize(&pdev->dev);  in of_device_register()
225 	device_unregister(&ofdev->dev);  in of_device_unregister()
233 	match = of_match_device(dev->driver->of_match_table, dev);  in of_device_get_match_data()
237 	return match->data;  in of_device_get_match_data()
249 	if ((!dev) || (!dev->of_node))  in of_device_get_modalias()
250 		return -ENODEV;  in of_device_get_modalias()
254 	csize = snprintf(str, len, "of:N%pOFn%c%s", dev->of_node, 'T',  in of_device_get_modalias()
255 			 of_node_get_device_type(dev->of_node));  in of_device_get_modalias()
257 	len -= csize;  in of_device_get_modalias()
261 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_get_modalias()
273 		len -= csize;  in of_device_get_modalias()
292 		return -ENOMEM;  in of_device_request_module()
304  * of_device_modalias - Fill buffer with newline terminated modalias string
311 	ssize_t sl = of_device_get_modalias(dev, str, len - 2);  in of_device_modalias()
314 	if (sl > len - 2)  in of_device_modalias()
315 		return -ENOMEM;  in of_device_modalias()
324  * of_device_uevent - Display OF related uevent information
325  * @dev:	Device to apply DMA configuration
335 	if ((!dev) || (!dev->of_node))  in of_device_uevent()
338 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);  in of_device_uevent()
339 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);  in of_device_uevent()
340 	type = of_node_get_device_type(dev->of_node);  in of_device_uevent()
347 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_uevent()
356 		if (dev->of_node == app->np) {  in of_device_uevent()
358 				       app->alias);  in of_device_uevent()
369 	if ((!dev) || (!dev->of_node))  in of_device_uevent_modalias()
370 		return -ENODEV;  in of_device_uevent_modalias()
374 		return -ENOMEM;  in of_device_uevent_modalias()
376 	sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],  in of_device_uevent_modalias()
377 				    sizeof(env->buf) - env->buflen);  in of_device_uevent_modalias()
378 	if (sl >= (sizeof(env->buf) - env->buflen))  in of_device_uevent_modalias()
379 		return -ENOMEM;  in of_device_uevent_modalias()
380 	env->buflen += sl;  in of_device_uevent_modalias()