[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / of / of_reserved_mem.c

/*
 * Device tree based initialization code for reserved memory.
 *
 * Copyright (c) 2013, 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 <mach/mtk_memcfg.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;
	unsigned long len;
	__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;
	MTK_MEMCFG_LOG_AND_PRINTK(KERN_ALERT
		"[PHY layout]%s   :   "
		"0x%08llx - 0x%08llx (0x%llx)\n",
		uname, 
		(unsigned long long)base, 
		(unsigned long long)base + size - 1,
		(unsigned long long)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, rmem->fdt_node, rmem->name) == 0) {
			pr_info("Reserved memory: initialized node %s, compatible id %s\n",
				rmem->name, compat);
			return 0;
		}
	}
	return -ENOENT;
}

/**
 * fdt_init_reserved_mem - allocate and init all saved reserved memory regions
 */
void __init fdt_init_reserved_mem(void)
{
	int i;
	for (i = 0; i < reserved_mem_count; i++) {
		struct reserved_mem *rmem = &reserved_mem[i];
		unsigned long node = rmem->fdt_node;
		int err = 0;

		if (rmem->size == 0)
			err = __reserved_mem_alloc_size(node, rmem->name,
						 &rmem->base, &rmem->size);
		if (err == 0)
			__reserved_mem_init_node(rmem);
	}
}
Commit	Line	Data
6fa3eb70 S	1	/*
	2	* Device tree based initialization code for reserved memory.
	3	*
	4	* Copyright (c) 2013, The Linux Foundation. All Rights Reserved.
	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>
	23	#include <mach/mtk_memcfg.h>
	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;
99	unsigned long len;
100	__be32 *prop;
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	MTK_MEMCFG_LOG_AND_PRINTK(KERN_ALERT
171	"[PHY layout]%s : "
172	"0x%08llx - 0x%08llx (0x%llx)\n",
173	uname,
174	(unsigned long long)base,
175	(unsigned long long)base + size - 1,
176	(unsigned long long)size);
177
178	return 0;
179	}
180
181	static const struct of_device_id __rmem_of_table_sentinel
182	__used __section(__reservedmem_of_table_end);
183
184	/**
185	* res_mem_init_node() - call region specific reserved memory init code
186	*/
187	static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
188	{
189	extern const struct of_device_id __reservedmem_of_table[];
190	const struct of_device_id *i;
191
192	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
193	reservedmem_of_init_fn initfn = i->data;
194	const char *compat = i->compatible;
195
196	if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
197	continue;
198
199	if (initfn(rmem, rmem->fdt_node, rmem->name) == 0) {
200	pr_info("Reserved memory: initialized node %s, compatible id %s\n",
201	rmem->name, compat);
202	return 0;
203	}
204	}
205	return -ENOENT;
206	}
207
208	/**
209	* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
210	*/
211	void __init fdt_init_reserved_mem(void)
212	{
213	int i;
214	for (i = 0; i < reserved_mem_count; i++) {
215	struct reserved_mem *rmem = &reserved_mem[i];
216	unsigned long node = rmem->fdt_node;
217	int err = 0;
218
219	if (rmem->size == 0)
220	err = __reserved_mem_alloc_size(node, rmem->name,
221	&rmem->base, &rmem->size);
222	if (err == 0)
223	__reserved_mem_init_node(rmem);
224	}
225	}