[deliverable/linux.git] / drivers / iommu / of_iommu.c

/*
 * OF helpers for IOMMU
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/export.h>
#include <linux/limits.h>
#include <linux/of.h>
#include <linux/of_iommu.h>

static const struct of_device_id __iommu_of_table_sentinel
	__used __section(__iommu_of_table_end);

/**
 * of_get_dma_window - Parse *dma-window property and returns 0 if found.
 *
 * @dn: device node
 * @prefix: prefix for property name if any
 * @index: index to start to parse
 * @busno: Returns busno if supported. Otherwise pass NULL
 * @addr: Returns address that DMA starts
 * @size: Returns the range that DMA can handle
 *
 * This supports different formats flexibly. "prefix" can be
 * configured if any. "busno" and "index" are optionally
 * specified. Set 0(or NULL) if not used.
 */
int of_get_dma_window(struct device_node *dn, const char *prefix, int index,
		      unsigned long *busno, dma_addr_t *addr, size_t *size)
{
	const __be32 *dma_window, *end;
	int bytes, cur_index = 0;
	char propname[NAME_MAX], addrname[NAME_MAX], sizename[NAME_MAX];

	if (!dn || !addr || !size)
		return -EINVAL;

	if (!prefix)
		prefix = "";

	snprintf(propname, sizeof(propname), "%sdma-window", prefix);
	snprintf(addrname, sizeof(addrname), "%s#dma-address-cells", prefix);
	snprintf(sizename, sizeof(sizename), "%s#dma-size-cells", prefix);

	dma_window = of_get_property(dn, propname, &bytes);
	if (!dma_window)
		return -ENODEV;
	end = dma_window + bytes / sizeof(*dma_window);

	while (dma_window < end) {
		u32 cells;
		const void *prop;

		/* busno is one cell if supported */
		if (busno)
			*busno = be32_to_cpup(dma_window++);

		prop = of_get_property(dn, addrname, NULL);
		if (!prop)
			prop = of_get_property(dn, "#address-cells", NULL);

		cells = prop ? be32_to_cpup(prop) : of_n_addr_cells(dn);
		if (!cells)
			return -EINVAL;
		*addr = of_read_number(dma_window, cells);
		dma_window += cells;

		prop = of_get_property(dn, sizename, NULL);
		cells = prop ? be32_to_cpup(prop) : of_n_size_cells(dn);
		if (!cells)
			return -EINVAL;
		*size = of_read_number(dma_window, cells);
		dma_window += cells;

		if (cur_index++ == index)
			break;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(of_get_dma_window);

void __init of_iommu_init(void)
{
	struct device_node *np;
	const struct of_device_id *match, *matches = &__iommu_of_table;

	for_each_matching_node_and_match(np, matches, &match) {
		const of_iommu_init_fn init_fn = match->data;

		if (init_fn(np))
			pr_err("Failed to initialise IOMMU %s\n",
				of_node_full_name(np));
	}
}
Commit	Line	Data
4e0ee78f HD	1	/*
	2	* OF helpers for IOMMU
	3	*
	4	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; if not, write to the Free Software Foundation, Inc.,
	17	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	18	*/
	19
	20	#include <linux/export.h>
	21	#include <linux/limits.h>
	22	#include <linux/of.h>
cbff5634	23	#include <linux/of_iommu.h>
4e0ee78f	24
1cd076bf WD	25	static const struct of_device_id __iommu_of_table_sentinel
	26	__used __section(__iommu_of_table_end);
	27
4e0ee78f HD	28	/**
	29	* of_get_dma_window - Parse *dma-window property and returns 0 if found.
	30	*
	31	* @dn: device node
	32	* @prefix: prefix for property name if any
	33	* @index: index to start to parse
	34	* @busno: Returns busno if supported. Otherwise pass NULL
	35	* @addr: Returns address that DMA starts
	36	* @size: Returns the range that DMA can handle
	37	*
	38	* This supports different formats flexibly. "prefix" can be
	39	* configured if any. "busno" and "index" are optionally
	40	* specified. Set 0(or NULL) if not used.
	41	*/
	42	int of_get_dma_window(struct device_node dn, const char prefix, int index,
	43	unsigned long busno, dma_addr_t addr, size_t *size)
	44	{
	45	const __be32 dma_window, end;
	46	int bytes, cur_index = 0;
	47	char propname[NAME_MAX], addrname[NAME_MAX], sizename[NAME_MAX];
	48
	49	if (!dn \|\| !addr \|\| !size)
	50	return -EINVAL;
	51
	52	if (!prefix)
	53	prefix = "";
	54
	55	snprintf(propname, sizeof(propname), "%sdma-window", prefix);
	56	snprintf(addrname, sizeof(addrname), "%s#dma-address-cells", prefix);
	57	snprintf(sizename, sizeof(sizename), "%s#dma-size-cells", prefix);
	58
	59	dma_window = of_get_property(dn, propname, &bytes);
	60	if (!dma_window)
	61	return -ENODEV;
	62	end = dma_window + bytes / sizeof(*dma_window);
	63
	64	while (dma_window < end) {
	65	u32 cells;
	66	const void *prop;
	67
	68	/* busno is one cell if supported */
	69	if (busno)
	70	*busno = be32_to_cpup(dma_window++);
	71
	72	prop = of_get_property(dn, addrname, NULL);
	73	if (!prop)
	74	prop = of_get_property(dn, "#address-cells", NULL);
	75
	76	cells = prop ? be32_to_cpup(prop) : of_n_addr_cells(dn);
	77	if (!cells)
	78	return -EINVAL;
	79	*addr = of_read_number(dma_window, cells);
	80	dma_window += cells;
	81
	82	prop = of_get_property(dn, sizename, NULL);
	83	cells = prop ? be32_to_cpup(prop) : of_n_size_cells(dn);
	84	if (!cells)
	85	return -EINVAL;
	86	*size = of_read_number(dma_window, cells);
	87	dma_window += cells;
	88
	89	if (cur_index++ == index)
	90	break;
	91	}
92	return 0;
93	}
94	EXPORT_SYMBOL_GPL(of_get_dma_window);
1cd076bf WD	95
	96	void __init of_iommu_init(void)
	97	{
	98	struct device_node *np;
	99	const struct of_device_id match, matches = &__iommu_of_table;
	100
	101	for_each_matching_node_and_match(np, matches, &match) {
	102	const of_iommu_init_fn init_fn = match->data;
	103
	104	if (init_fn(np))
	105	pr_err("Failed to initialise IOMMU %s\n",
	106	of_node_full_name(np));
	107	}
	108	}