1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/dma-direct.h> /* for bus_dma_region */
9 #include <linux/dma-map-ops.h>
20  * of_match_device - Tell if a struct device matches an of_device_id list
30 	if ((!matches) || (!dev->of_node))  in of_match_device()
32 	return of_match_node(matches, dev->of_node);  in of_match_device()
42 	tmp = get_device(&dev->dev);  in of_dev_get()
53 		put_device(&dev->dev);  in of_dev_put()
59 	BUG_ON(ofdev->dev.of_node == NULL);  in of_device_add()
63 	ofdev->name = dev_name(&ofdev->dev);  in of_device_add()
64 	ofdev->id = PLATFORM_DEVID_NONE;  in of_device_add()
71 	set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));  in of_device_add()
73 	return device_add(&ofdev->dev);  in of_device_add()
77  * of_dma_configure - Setup DMA configuration
94 	const struct iommu_ops *iommu;  in of_dma_configure_id()  local
95 	const struct bus_dma_region *map = NULL;  in of_dma_configure_id()  local
97 	u64 mask, end, size = 0;  in of_dma_configure_id()  local
101 	ret = of_dma_get_range(np, &map);  in of_dma_configure_id()
105 		 * DMA configuration regardless of whether "dma-ranges" is  in of_dma_configure_id()
109 			return ret == -ENODEV ? 0 : ret;  in of_dma_configure_id()
111 		const struct bus_dma_region *r = map;  in of_dma_configure_id()
115 		for (dma_start = ~0; r->size; r++) {  in of_dma_configure_id()
117 			if (r->dma_start < dma_start)  in of_dma_configure_id()
118 				dma_start = r->dma_start;  in of_dma_configure_id()
119 			if (r->dma_start + r->size > dma_end)  in of_dma_configure_id()
120 				dma_end = r->dma_start + r->size;  in of_dma_configure_id()
122 		size = dma_end - dma_start;  in of_dma_configure_id()
125 		 * Add a work around to treat the size as mask + 1 in case  in of_dma_configure_id()
126 		 * it is defined in DT as a mask.  in of_dma_configure_id()
129 			dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n",  in of_dma_configure_id()
136 			kfree(map);  in of_dma_configure_id()
137 			return -EINVAL;  in of_dma_configure_id()
142 	 * If @dev is expected to be DMA-capable then the bus code that created  in of_dma_configure_id()
145 	 * coherent mask if not, but we'll no longer do so quietly.  in of_dma_configure_id()
147 	if (!dev->dma_mask) {  in of_dma_configure_id()
148 		dev_warn(dev, "DMA mask not set\n");  in of_dma_configure_id()
149 		dev->dma_mask = &dev->coherent_dma_mask;  in of_dma_configure_id()
152 	if (!size && dev->coherent_dma_mask)  in of_dma_configure_id()
153 		size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);  in of_dma_configure_id()
158 	 * Limit coherent and dma mask based on size and default mask  in of_dma_configure_id()
161 	end = dma_start + size - 1;  in of_dma_configure_id()
162 	mask = DMA_BIT_MASK(ilog2(end) + 1);  in of_dma_configure_id()
163 	dev->coherent_dma_mask &= mask;  in of_dma_configure_id()
164 	*dev->dma_mask &= mask;  in of_dma_configure_id()
165 	/* ...but only set bus limit and range map if we found valid dma-ranges earlier */  in of_dma_configure_id()
167 		dev->bus_dma_limit = end;  in of_dma_configure_id()
168 		dev->dma_range_map = map;  in of_dma_configure_id()
175 	iommu = of_iommu_configure(dev, np, id);  in of_dma_configure_id()
176 	if (PTR_ERR(iommu) == -EPROBE_DEFER) {  in of_dma_configure_id()
177 		/* Don't touch range map if it wasn't set from a valid dma-ranges */  in of_dma_configure_id()
179 			dev->dma_range_map = NULL;  in of_dma_configure_id()
180 		kfree(map);  in of_dma_configure_id()
181 		return -EPROBE_DEFER;  in of_dma_configure_id()
184 	dev_dbg(dev, "device is%sbehind an iommu\n",  in of_dma_configure_id()
185 		iommu ? " " : " not ");  in of_dma_configure_id()
187 	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);  in of_dma_configure_id()
195 	device_initialize(&pdev->dev);  in of_device_register()
202 	device_unregister(&ofdev->dev);  in of_device_unregister()
210 	match = of_match_device(dev->driver->of_match_table, dev);  in of_device_get_match_data()
214 	return match->data;  in of_device_get_match_data()
226 	if ((!dev) || (!dev->of_node))  in of_device_get_modalias()
227 		return -ENODEV;  in of_device_get_modalias()
231 	csize = snprintf(str, len, "of:N%pOFn%c%s", dev->of_node, 'T',  in of_device_get_modalias()
232 			 of_node_get_device_type(dev->of_node));  in of_device_get_modalias()
234 	len -= csize;  in of_device_get_modalias()
238 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_get_modalias()
250 		len -= csize;  in of_device_get_modalias()
272 		return -ENOMEM;  in of_device_request_module()
275 	str[size - 1] = '\0';  in of_device_request_module()
284  * of_device_modalias - Fill buffer with newline terminated modalias string
288 	ssize_t sl = of_device_get_modalias(dev, str, len - 2);  in of_device_modalias()
291 	if (sl > len - 2)  in of_device_modalias()
292 		return -ENOMEM;  in of_device_modalias()
301  * of_device_uevent - Display OF related uevent information
310 	if ((!dev) || (!dev->of_node))  in of_device_uevent()
313 	add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);  in of_device_uevent()
314 	add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);  in of_device_uevent()
315 	type = of_node_get_device_type(dev->of_node);  in of_device_uevent()
322 	of_property_for_each_string(dev->of_node, "compatible", p, compat) {  in of_device_uevent()
331 		if (dev->of_node == app->np) {  in of_device_uevent()
333 				       app->alias);  in of_device_uevent()
344 	if ((!dev) || (!dev->of_node))  in of_device_uevent_modalias()
345 		return -ENODEV;  in of_device_uevent_modalias()
349 		return -ENOMEM;  in of_device_uevent_modalias()
351 	sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],  in of_device_uevent_modalias()
352 				    sizeof(env->buf) - env->buflen);  in of_device_uevent_modalias()
353 	if (sl >= (sizeof(env->buf) - env->buflen))  in of_device_uevent_modalias()
354 		return -ENOMEM;  in of_device_uevent_modalias()
355 	env->buflen += sl;  in of_device_uevent_modalias()