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Marek Szyprowski3f0c8202014-02-28 14:42:48 +01001/*
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
24#define MAX_RESERVED_REGIONS 16
25static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
26static int reserved_mem_count;
27
28#if defined(CONFIG_HAVE_MEMBLOCK)
29#include <linux/memblock.h>
30int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
31 phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
32 phys_addr_t *res_base)
33{
34 /*
35 * We use __memblock_alloc_base() because memblock_alloc_base()
36 * panic()s on allocation failure.
37 */
38 phys_addr_t base = __memblock_alloc_base(size, align, end);
39 if (!base)
40 return -ENOMEM;
41
42 /*
43 * Check if the allocated region fits in to start..end window
44 */
45 if (base < start) {
46 memblock_free(base, size);
47 return -ENOMEM;
48 }
49
50 *res_base = base;
51 if (nomap)
52 return memblock_remove(base, size);
53 return 0;
54}
55#else
56int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
57 phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
58 phys_addr_t *res_base)
59{
60 pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
61 size, nomap ? " (nomap)" : "");
62 return -ENOSYS;
63}
64#endif
65
66/**
67 * res_mem_save_node() - save fdt node for second pass initialization
68 */
69void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
70 phys_addr_t base, phys_addr_t size)
71{
72 struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
73
74 if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
75 pr_err("Reserved memory: not enough space all defined regions.\n");
76 return;
77 }
78
79 rmem->fdt_node = node;
80 rmem->name = uname;
81 rmem->base = base;
82 rmem->size = size;
83
84 reserved_mem_count++;
85 return;
86}
87
88/**
89 * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
90 * and 'alloc-ranges' properties
91 */
92static int __init __reserved_mem_alloc_size(unsigned long node,
93 const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
94{
95 int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
96 phys_addr_t start = 0, end = 0;
97 phys_addr_t base = 0, align = 0, size;
Rob Herring9d0c4df2014-04-01 23:49:03 -050098 int len;
99 const __be32 *prop;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100100 int nomap;
101 int ret;
102
103 prop = of_get_flat_dt_prop(node, "size", &len);
104 if (!prop)
105 return -EINVAL;
106
107 if (len != dt_root_size_cells * sizeof(__be32)) {
108 pr_err("Reserved memory: invalid size property in '%s' node.\n",
109 uname);
110 return -EINVAL;
111 }
112 size = dt_mem_next_cell(dt_root_size_cells, &prop);
113
114 nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
115
116 prop = of_get_flat_dt_prop(node, "alignment", &len);
117 if (prop) {
118 if (len != dt_root_addr_cells * sizeof(__be32)) {
119 pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
120 uname);
121 return -EINVAL;
122 }
123 align = dt_mem_next_cell(dt_root_addr_cells, &prop);
124 }
125
126 prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
127 if (prop) {
128
129 if (len % t_len != 0) {
130 pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
131 uname);
132 return -EINVAL;
133 }
134
135 base = 0;
136
137 while (len > 0) {
138 start = dt_mem_next_cell(dt_root_addr_cells, &prop);
139 end = start + dt_mem_next_cell(dt_root_size_cells,
140 &prop);
141
142 ret = early_init_dt_alloc_reserved_memory_arch(size,
143 align, start, end, nomap, &base);
144 if (ret == 0) {
145 pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
146 uname, &base,
147 (unsigned long)size / SZ_1M);
148 break;
149 }
150 len -= t_len;
151 }
152
153 } else {
154 ret = early_init_dt_alloc_reserved_memory_arch(size, align,
155 0, 0, nomap, &base);
156 if (ret == 0)
157 pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
158 uname, &base, (unsigned long)size / SZ_1M);
159 }
160
161 if (base == 0) {
162 pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
163 uname);
164 return -ENOMEM;
165 }
166
167 *res_base = base;
168 *res_size = size;
169
170 return 0;
171}
172
Marek Szyprowskif618c472014-02-28 14:42:49 +0100173static const struct of_device_id __rmem_of_table_sentinel
174 __used __section(__reservedmem_of_table_end);
175
176/**
177 * res_mem_init_node() - call region specific reserved memory init code
178 */
179static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
180{
181 extern const struct of_device_id __reservedmem_of_table[];
182 const struct of_device_id *i;
183
184 for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
185 reservedmem_of_init_fn initfn = i->data;
186 const char *compat = i->compatible;
187
188 if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
189 continue;
190
Rob Herring9dd31072014-05-08 16:06:17 -0500191 if (initfn(rmem) == 0) {
Marek Szyprowskif618c472014-02-28 14:42:49 +0100192 pr_info("Reserved memory: initialized node %s, compatible id %s\n",
193 rmem->name, compat);
194 return 0;
195 }
196 }
197 return -ENOENT;
198}
199
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100200/**
201 * fdt_init_reserved_mem - allocate and init all saved reserved memory regions
202 */
203void __init fdt_init_reserved_mem(void)
204{
205 int i;
206 for (i = 0; i < reserved_mem_count; i++) {
207 struct reserved_mem *rmem = &reserved_mem[i];
208 unsigned long node = rmem->fdt_node;
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200209 int len;
210 const __be32 *prop;
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100211 int err = 0;
212
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200213 prop = of_get_flat_dt_prop(node, "phandle", &len);
214 if (!prop)
215 prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
216 if (prop)
217 rmem->phandle = of_read_number(prop, len/4);
218
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100219 if (rmem->size == 0)
220 err = __reserved_mem_alloc_size(node, rmem->name,
221 &rmem->base, &rmem->size);
Marek Szyprowskif618c472014-02-28 14:42:49 +0100222 if (err == 0)
223 __reserved_mem_init_node(rmem);
Marek Szyprowski3f0c8202014-02-28 14:42:48 +0100224 }
225}
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200226
227static inline struct reserved_mem *__find_rmem(struct device_node *node)
228{
229 unsigned int i;
230
231 if (!node->phandle)
232 return NULL;
233
234 for (i = 0; i < reserved_mem_count; i++)
235 if (reserved_mem[i].phandle == node->phandle)
236 return &reserved_mem[i];
237 return NULL;
238}
239
240/**
241 * of_reserved_mem_device_init() - assign reserved memory region to given device
242 *
243 * This function assign memory region pointed by "memory-region" device tree
244 * property to the given device.
245 */
Marek Szyprowski47f29df2014-10-29 14:50:29 -0700246int of_reserved_mem_device_init(struct device *dev)
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200247{
248 struct reserved_mem *rmem;
249 struct device_node *np;
Marek Szyprowski47f29df2014-10-29 14:50:29 -0700250 int ret;
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200251
252 np = of_parse_phandle(dev->of_node, "memory-region", 0);
253 if (!np)
Marek Szyprowski47f29df2014-10-29 14:50:29 -0700254 return -ENODEV;
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200255
256 rmem = __find_rmem(np);
257 of_node_put(np);
258
259 if (!rmem || !rmem->ops || !rmem->ops->device_init)
Marek Szyprowski47f29df2014-10-29 14:50:29 -0700260 return -EINVAL;
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200261
Marek Szyprowski47f29df2014-10-29 14:50:29 -0700262 ret = rmem->ops->device_init(rmem, dev);
263 if (ret == 0)
264 dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
265
266 return ret;
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200267}
George G. Davis615fde72015-01-09 09:29:05 -0500268EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
Marek Szyprowski9dcfee02014-07-14 10:28:04 +0200269
270/**
271 * of_reserved_mem_device_release() - release reserved memory device structures
272 *
273 * This function releases structures allocated for memory region handling for
274 * the given device.
275 */
276void of_reserved_mem_device_release(struct device *dev)
277{
278 struct reserved_mem *rmem;
279 struct device_node *np;
280
281 np = of_parse_phandle(dev->of_node, "memory-region", 0);
282 if (!np)
283 return;
284
285 rmem = __find_rmem(np);
286 of_node_put(np);
287
288 if (!rmem || !rmem->ops || !rmem->ops->device_release)
289 return;
290
291 rmem->ops->device_release(rmem, dev);
292}
George G. Davis615fde72015-01-09 09:29:05 -0500293EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);