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3f0c8206 MS |
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 | ||
24 | #define MAX_RESERVED_REGIONS 16 | |
25 | static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS]; | |
26 | static int reserved_mem_count; | |
27 | ||
28 | #if defined(CONFIG_HAVE_MEMBLOCK) | |
29 | #include <linux/memblock.h> | |
30 | int __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 | |
56 | int __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 | */ | |
69 | void __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 | */ | |
92 | static 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; | |
9d0c4dfe RH |
98 | int len; |
99 | const __be32 *prop; | |
3f0c8206 MS |
100 | 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 | ||
f618c470 MS |
173 | static 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 | */ | |
179 | static 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 | ||
9dd31075 | 191 | if (initfn(rmem) == 0) { |
f618c470 MS |
192 | 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 | ||
3f0c8206 MS |
200 | /** |
201 | * fdt_init_reserved_mem - allocate and init all saved reserved memory regions | |
202 | */ | |
203 | void __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; | |
9dcfee01 MS |
209 | int len; |
210 | const __be32 *prop; | |
3f0c8206 MS |
211 | int err = 0; |
212 | ||
9dcfee01 MS |
213 | 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 | ||
3f0c8206 MS |
219 | if (rmem->size == 0) |
220 | err = __reserved_mem_alloc_size(node, rmem->name, | |
221 | &rmem->base, &rmem->size); | |
f618c470 MS |
222 | if (err == 0) |
223 | __reserved_mem_init_node(rmem); | |
3f0c8206 MS |
224 | } |
225 | } | |
9dcfee01 MS |
226 | |
227 | static 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 | */ | |
47f29df7 | 246 | int of_reserved_mem_device_init(struct device *dev) |
9dcfee01 MS |
247 | { |
248 | struct reserved_mem *rmem; | |
249 | struct device_node *np; | |
47f29df7 | 250 | int ret; |
9dcfee01 MS |
251 | |
252 | np = of_parse_phandle(dev->of_node, "memory-region", 0); | |
253 | if (!np) | |
47f29df7 | 254 | return -ENODEV; |
9dcfee01 MS |
255 | |
256 | rmem = __find_rmem(np); | |
257 | of_node_put(np); | |
258 | ||
259 | if (!rmem || !rmem->ops || !rmem->ops->device_init) | |
47f29df7 MS |
260 | return -EINVAL; |
261 | ||
262 | ret = rmem->ops->device_init(rmem, dev); | |
263 | if (ret == 0) | |
264 | dev_info(dev, "assigned reserved memory node %s\n", rmem->name); | |
9dcfee01 | 265 | |
47f29df7 | 266 | return ret; |
9dcfee01 MS |
267 | } |
268 | ||
269 | /** | |
270 | * of_reserved_mem_device_release() - release reserved memory device structures | |
271 | * | |
272 | * This function releases structures allocated for memory region handling for | |
273 | * the given device. | |
274 | */ | |
275 | void of_reserved_mem_device_release(struct device *dev) | |
276 | { | |
277 | struct reserved_mem *rmem; | |
278 | struct device_node *np; | |
279 | ||
280 | np = of_parse_phandle(dev->of_node, "memory-region", 0); | |
281 | if (!np) | |
282 | return; | |
283 | ||
284 | rmem = __find_rmem(np); | |
285 | of_node_put(np); | |
286 | ||
287 | if (!rmem || !rmem->ops || !rmem->ops->device_release) | |
288 | return; | |
289 | ||
290 | rmem->ops->device_release(rmem, dev); | |
291 | } |