[deliverable/linux.git] / drivers / of / of_reserved_mem.c

/*
 * Device tree based initialization code for reserved memory.
 *
 * Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
 * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
 * Author: Josh Cartwright <joshc@codeaurora.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License or (at your optional) any later version of the license.
 */

#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/mm.h>
#include <linux/sizes.h>
#include <linux/of_reserved_mem.h>
#include <linux/sort.h>

#define MAX_RESERVED_REGIONS	16
static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
static int reserved_mem_count;

#if defined(CONFIG_HAVE_MEMBLOCK)
#include <linux/memblock.h>
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	phys_addr_t *res_base)
{
	/*
	 * We use __memblock_alloc_base() because memblock_alloc_base()
	 * panic()s on allocation failure.
	 */
	phys_addr_t base = __memblock_alloc_base(size, align, end);
	if (!base)
		return -ENOMEM;

	/*
	 * Check if the allocated region fits in to start..end window
	 */
	if (base < start) {
		memblock_free(base, size);
		return -ENOMEM;
	}

	*res_base = base;
	if (nomap)
		return memblock_remove(base, size);
	return 0;
}
#else
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	phys_addr_t *res_base)
{
	pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
		  size, nomap ? " (nomap)" : "");
	return -ENOSYS;
}
#endif

/**
 * res_mem_save_node() - save fdt node for second pass initialization
 */
void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
				      phys_addr_t base, phys_addr_t size)
{
	struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];

	if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
		pr_err("Reserved memory: not enough space all defined regions.\n");
		return;
	}

	rmem->fdt_node = node;
	rmem->name = uname;
	rmem->base = base;
	rmem->size = size;

	reserved_mem_count++;
	return;
}

/**
 * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
 *			  and 'alloc-ranges' properties
 */
static int __init __reserved_mem_alloc_size(unsigned long node,
	const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
{
	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
	phys_addr_t start = 0, end = 0;
	phys_addr_t base = 0, align = 0, size;
	int len;
	const __be32 *prop;
	int nomap;
	int ret;

	prop = of_get_flat_dt_prop(node, "size", &len);
	if (!prop)
		return -EINVAL;

	if (len != dt_root_size_cells * sizeof(__be32)) {
		pr_err("Reserved memory: invalid size property in '%s' node.\n",
				uname);
		return -EINVAL;
	}
	size = dt_mem_next_cell(dt_root_size_cells, &prop);

	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;

	prop = of_get_flat_dt_prop(node, "alignment", &len);
	if (prop) {
		if (len != dt_root_addr_cells * sizeof(__be32)) {
			pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
				uname);
			return -EINVAL;
		}
		align = dt_mem_next_cell(dt_root_addr_cells, &prop);
	}

	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
	if (prop) {

		if (len % t_len != 0) {
			pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
			       uname);
			return -EINVAL;
		}

		base = 0;

		while (len > 0) {
			start = dt_mem_next_cell(dt_root_addr_cells, &prop);
			end = start + dt_mem_next_cell(dt_root_size_cells,
						       &prop);

			ret = early_init_dt_alloc_reserved_memory_arch(size,
					align, start, end, nomap, &base);
			if (ret == 0) {
				pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
					uname, &base,
					(unsigned long)size / SZ_1M);
				break;
			}
			len -= t_len;
		}

	} else {
		ret = early_init_dt_alloc_reserved_memory_arch(size, align,
							0, 0, nomap, &base);
		if (ret == 0)
			pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
				uname, &base, (unsigned long)size / SZ_1M);
	}

	if (base == 0) {
		pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
			uname);
		return -ENOMEM;
	}

	*res_base = base;
	*res_size = size;

	return 0;
}

static const struct of_device_id __rmem_of_table_sentinel
	__used __section(__reservedmem_of_table_end);

/**
 * res_mem_init_node() - call region specific reserved memory init code
 */
static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
{
	extern const struct of_device_id __reservedmem_of_table[];
	const struct of_device_id *i;

	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
		reservedmem_of_init_fn initfn = i->data;
		const char *compat = i->compatible;

		if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
			continue;

		if (initfn(rmem) == 0) {
			pr_info("Reserved memory: initialized node %s, compatible id %s\n",
				rmem->name, compat);
			return 0;
		}
	}
	return -ENOENT;
}

static int __init __rmem_cmp(const void *a, const void *b)
{
	const struct reserved_mem *ra = a, *rb = b;

	return ra->base - rb->base;
}

static void __init __rmem_check_for_overlap(void)
{
	int i;

	if (reserved_mem_count < 2)
		return;

	sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
	     __rmem_cmp, NULL);
	for (i = 0; i < reserved_mem_count - 1; i++) {
		struct reserved_mem *this, *next;

		this = &reserved_mem[i];
		next = &reserved_mem[i + 1];
		if (!(this->base && next->base))
			continue;
		if (this->base + this->size > next->base) {
			phys_addr_t this_end, next_end;

			this_end = this->base + this->size;
			next_end = next->base + next->size;
			pr_err("Reserved memory: OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
			       this->name, &this->base, &this_end,
			       next->name, &next->base, &next_end);
		}
	}
}

/**
 * fdt_init_reserved_mem - allocate and init all saved reserved memory regions
 */
void __init fdt_init_reserved_mem(void)
{
	int i;

	/* check for overlapping reserved regions */
	__rmem_check_for_overlap();

	for (i = 0; i < reserved_mem_count; i++) {
		struct reserved_mem *rmem = &reserved_mem[i];
		unsigned long node = rmem->fdt_node;
		int len;
		const __be32 *prop;
		int err = 0;

		prop = of_get_flat_dt_prop(node, "phandle", &len);
		if (!prop)
			prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
		if (prop)
			rmem->phandle = of_read_number(prop, len/4);

		if (rmem->size == 0)
			err = __reserved_mem_alloc_size(node, rmem->name,
						 &rmem->base, &rmem->size);
		if (err == 0)
			__reserved_mem_init_node(rmem);
	}
}

static inline struct reserved_mem *__find_rmem(struct device_node *node)
{
	unsigned int i;

	if (!node->phandle)
		return NULL;

	for (i = 0; i < reserved_mem_count; i++)
		if (reserved_mem[i].phandle == node->phandle)
			return &reserved_mem[i];
	return NULL;
}

/**
 * of_reserved_mem_device_init() - assign reserved memory region to given device
 *
 * This function assign memory region pointed by "memory-region" device tree
 * property to the given device.
 */
int of_reserved_mem_device_init(struct device *dev)
{
	struct reserved_mem *rmem;
	struct device_node *np;
	int ret;

	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	if (!np)
		return -ENODEV;

	rmem = __find_rmem(np);
	of_node_put(np);

	if (!rmem || !rmem->ops || !rmem->ops->device_init)
		return -EINVAL;

	ret = rmem->ops->device_init(rmem, dev);
	if (ret == 0)
		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);

	return ret;
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);

/**
 * of_reserved_mem_device_release() - release reserved memory device structures
 *
 * This function releases structures allocated for memory region handling for
 * the given device.
 */
void of_reserved_mem_device_release(struct device *dev)
{
	struct reserved_mem *rmem;
	struct device_node *np;

	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	if (!np)
		return;

	rmem = __find_rmem(np);
	of_node_put(np);

	if (!rmem || !rmem->ops || !rmem->ops->device_release)
		return;

	rmem->ops->device_release(rmem, dev);
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
Commit	Line	Data
3f0c8206 MS	1	/*
	2	* Device tree based initialization code for reserved memory.
	3	*
ae1add24	4	* Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
3f0c8206 MS	5	* Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
	6	* http://www.samsung.com
	7	* Author: Marek Szyprowski <m.szyprowski@samsung.com>
	8	* Author: Josh Cartwright <joshc@codeaurora.org>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of the
	13	* License or (at your optional) any later version of the license.
	14	*/
	15
	16	#include <linux/err.h>
	17	#include <linux/of.h>
	18	#include <linux/of_fdt.h>
	19	#include <linux/of_platform.h>
	20	#include <linux/mm.h>
	21	#include <linux/sizes.h>
	22	#include <linux/of_reserved_mem.h>
ae1add24	23	#include <linux/sort.h>
3f0c8206 MS	24
	25	#define MAX_RESERVED_REGIONS 16
	26	static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
	27	static int reserved_mem_count;
	28
	29	#if defined(CONFIG_HAVE_MEMBLOCK)
	30	#include <linux/memblock.h>
	31	int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	32	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	33	phys_addr_t *res_base)
	34	{
	35	/*
	36	* We use __memblock_alloc_base() because memblock_alloc_base()
	37	* panic()s on allocation failure.
	38	*/
	39	phys_addr_t base = __memblock_alloc_base(size, align, end);
	40	if (!base)
	41	return -ENOMEM;
	42
	43	/*
	44	* Check if the allocated region fits in to start..end window
	45	*/
	46	if (base < start) {
	47	memblock_free(base, size);
	48	return -ENOMEM;
	49	}
	50
	51	*res_base = base;
	52	if (nomap)
	53	return memblock_remove(base, size);
	54	return 0;
	55	}
	56	#else
	57	int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	58	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	59	phys_addr_t *res_base)
	60	{
	61	pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
	62	size, nomap ? " (nomap)" : "");
	63	return -ENOSYS;
	64	}
	65	#endif
	66
	67	/**
	68	* res_mem_save_node() - save fdt node for second pass initialization
	69	*/
	70	void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
	71	phys_addr_t base, phys_addr_t size)
	72	{
	73	struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
	74
	75	if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
	76	pr_err("Reserved memory: not enough space all defined regions.\n");
	77	return;
	78	}
	79
	80	rmem->fdt_node = node;
	81	rmem->name = uname;
	82	rmem->base = base;
	83	rmem->size = size;
	84
	85	reserved_mem_count++;
	86	return;
	87	}
88
89	/**
90	* res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
91	* and 'alloc-ranges' properties
92	*/
93	static int __init __reserved_mem_alloc_size(unsigned long node,
94	const char uname, phys_addr_t res_base, phys_addr_t *res_size)
95	{
96	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
97	phys_addr_t start = 0, end = 0;
98	phys_addr_t base = 0, align = 0, size;
9d0c4dfe RH	99	int len;
9d0c4dfe RH	100	const __be32 *prop;
3f0c8206 MS	101	int nomap;
	102	int ret;
	103
	104	prop = of_get_flat_dt_prop(node, "size", &len);
	105	if (!prop)
	106	return -EINVAL;
	107
	108	if (len != dt_root_size_cells * sizeof(__be32)) {
	109	pr_err("Reserved memory: invalid size property in '%s' node.\n",
	110	uname);
	111	return -EINVAL;
	112	}
	113	size = dt_mem_next_cell(dt_root_size_cells, &prop);
	114
	115	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
	116
	117	prop = of_get_flat_dt_prop(node, "alignment", &len);
	118	if (prop) {
	119	if (len != dt_root_addr_cells * sizeof(__be32)) {
	120	pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
	121	uname);
	122	return -EINVAL;
	123	}
	124	align = dt_mem_next_cell(dt_root_addr_cells, &prop);
	125	}
	126
	127	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
	128	if (prop) {
	129
	130	if (len % t_len != 0) {
	131	pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
	132	uname);
	133	return -EINVAL;
	134	}
	135
	136	base = 0;
	137
	138	while (len > 0) {
	139	start = dt_mem_next_cell(dt_root_addr_cells, &prop);
	140	end = start + dt_mem_next_cell(dt_root_size_cells,
	141	&prop);
	142
	143	ret = early_init_dt_alloc_reserved_memory_arch(size,
	144	align, start, end, nomap, &base);
	145	if (ret == 0) {
	146	pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
	147	uname, &base,
	148	(unsigned long)size / SZ_1M);
	149	break;
	150	}
	151	len -= t_len;
	152	}
	153
	154	} else {
	155	ret = early_init_dt_alloc_reserved_memory_arch(size, align,
	156	0, 0, nomap, &base);
	157	if (ret == 0)
	158	pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
	159	uname, &base, (unsigned long)size / SZ_1M);
	160	}
	161
	162	if (base == 0) {
	163	pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
	164	uname);
165	return -ENOMEM;
166	}
167
168	*res_base = base;
169	*res_size = size;
170
171	return 0;
172	}
173
f618c470 MS	174	static const struct of_device_id __rmem_of_table_sentinel
	175	__used __section(__reservedmem_of_table_end);
	176
	177	/**
	178	* res_mem_init_node() - call region specific reserved memory init code
	179	*/
	180	static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
	181	{
	182	extern const struct of_device_id __reservedmem_of_table[];
	183	const struct of_device_id *i;
	184
	185	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
	186	reservedmem_of_init_fn initfn = i->data;
	187	const char *compat = i->compatible;
	188
	189	if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
	190	continue;
	191
9dd31075	192	if (initfn(rmem) == 0) {
f618c470 MS	193	pr_info("Reserved memory: initialized node %s, compatible id %s\n",
	194	rmem->name, compat);
	195	return 0;
	196	}
	197	}
	198	return -ENOENT;
	199	}
	200
ae1add24 MH	201	static int __init __rmem_cmp(const void a, const void b)
	202	{
	203	const struct reserved_mem ra = a, rb = b;
	204
	205	return ra->base - rb->base;
	206	}
	207
	208	static void __init __rmem_check_for_overlap(void)
	209	{
	210	int i;
	211
	212	if (reserved_mem_count < 2)
	213	return;
	214
	215	sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
	216	__rmem_cmp, NULL);
	217	for (i = 0; i < reserved_mem_count - 1; i++) {
	218	struct reserved_mem this, next;
	219
	220	this = &reserved_mem[i];
	221	next = &reserved_mem[i + 1];
	222	if (!(this->base && next->base))
	223	continue;
	224	if (this->base + this->size > next->base) {
	225	phys_addr_t this_end, next_end;
	226
	227	this_end = this->base + this->size;
	228	next_end = next->base + next->size;
85a1c77f ME	229	pr_err("Reserved memory: OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
	230	this->name, &this->base, &this_end,
	231	next->name, &next->base, &next_end);
ae1add24 MH	232	}
	233	}
	234	}
	235
3f0c8206 MS	236	/**
	237	* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
	238	*/
	239	void __init fdt_init_reserved_mem(void)
	240	{
	241	int i;
ae1add24 MH	242
	243	/* check for overlapping reserved regions */
	244	__rmem_check_for_overlap();
	245
3f0c8206 MS	246	for (i = 0; i < reserved_mem_count; i++) {
	247	struct reserved_mem *rmem = &reserved_mem[i];
	248	unsigned long node = rmem->fdt_node;
9dcfee01 MS	249	int len;
9dcfee01 MS	250	const __be32 *prop;
3f0c8206 MS	251	int err = 0;
3f0c8206 MS	252
9dcfee01 MS	253	prop = of_get_flat_dt_prop(node, "phandle", &len);
	254	if (!prop)
	255	prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
	256	if (prop)
	257	rmem->phandle = of_read_number(prop, len/4);
	258
3f0c8206 MS	259	if (rmem->size == 0)
	260	err = __reserved_mem_alloc_size(node, rmem->name,
	261	&rmem->base, &rmem->size);
f618c470 MS	262	if (err == 0)
f618c470 MS	263	__reserved_mem_init_node(rmem);
3f0c8206 MS	264	}
3f0c8206 MS	265	}
9dcfee01 MS	266
	267	static inline struct reserved_mem __find_rmem(struct device_node node)
	268	{
	269	unsigned int i;
	270
	271	if (!node->phandle)
	272	return NULL;
	273
	274	for (i = 0; i < reserved_mem_count; i++)
	275	if (reserved_mem[i].phandle == node->phandle)
	276	return &reserved_mem[i];
	277	return NULL;
	278	}
	279
	280	/**
	281	* of_reserved_mem_device_init() - assign reserved memory region to given device
	282	*
	283	* This function assign memory region pointed by "memory-region" device tree
	284	* property to the given device.
	285	*/
47f29df7	286	int of_reserved_mem_device_init(struct device *dev)
9dcfee01 MS	287	{
	288	struct reserved_mem *rmem;
	289	struct device_node *np;
47f29df7	290	int ret;
9dcfee01 MS	291
	292	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	293	if (!np)
47f29df7	294	return -ENODEV;
9dcfee01 MS	295
	296	rmem = __find_rmem(np);
	297	of_node_put(np);
	298
	299	if (!rmem \|\| !rmem->ops \|\| !rmem->ops->device_init)
47f29df7 MS	300	return -EINVAL;
	301
	302	ret = rmem->ops->device_init(rmem, dev);
	303	if (ret == 0)
	304	dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
9dcfee01	305
47f29df7	306	return ret;
9dcfee01	307	}
615fde79	308	EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
9dcfee01 MS	309
	310	/**
	311	* of_reserved_mem_device_release() - release reserved memory device structures
	312	*
	313	* This function releases structures allocated for memory region handling for
	314	* the given device.
	315	*/
	316	void of_reserved_mem_device_release(struct device *dev)
	317	{
	318	struct reserved_mem *rmem;
	319	struct device_node *np;
	320
	321	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	322	if (!np)
	323	return;
	324
	325	rmem = __find_rmem(np);
	326	of_node_put(np);
	327
	328	if (!rmem \|\| !rmem->ops \|\| !rmem->ops->device_release)
	329	return;
	330
	331	rmem->ops->device_release(rmem, dev);
	332	}
615fde79	333	EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);