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9eb8f674 GL |
1 | /* |
2 | * linux/arch/arm/kernel/devtree.c | |
3 | * | |
4 | * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/init.h> | |
ecea4ab6 | 12 | #include <linux/export.h> |
9eb8f674 GL |
13 | #include <linux/errno.h> |
14 | #include <linux/types.h> | |
9eb8f674 GL |
15 | #include <linux/memblock.h> |
16 | #include <linux/of.h> | |
17 | #include <linux/of_fdt.h> | |
18 | #include <linux/of_irq.h> | |
19 | #include <linux/of_platform.h> | |
6c3ff8b1 | 20 | #include <linux/smp.h> |
9eb8f674 | 21 | |
a0ae0240 | 22 | #include <asm/cputype.h> |
9eb8f674 GL |
23 | #include <asm/setup.h> |
24 | #include <asm/page.h> | |
2374b063 | 25 | #include <asm/prom.h> |
a0ae0240 | 26 | #include <asm/smp_plat.h> |
93c02ab4 GL |
27 | #include <asm/mach/arch.h> |
28 | #include <asm/mach-types.h> | |
9eb8f674 | 29 | |
9eb8f674 | 30 | |
6c3ff8b1 | 31 | #ifdef CONFIG_SMP |
9a721c41 RH |
32 | extern struct of_cpu_method __cpu_method_of_table[]; |
33 | ||
34 | static const struct of_cpu_method __cpu_method_of_table_sentinel | |
35 | __used __section(__cpu_method_of_table_end); | |
36 | ||
6c3ff8b1 SB |
37 | |
38 | static int __init set_smp_ops_by_method(struct device_node *node) | |
39 | { | |
40 | const char *method; | |
9a721c41 | 41 | struct of_cpu_method *m = __cpu_method_of_table; |
6c3ff8b1 SB |
42 | |
43 | if (of_property_read_string(node, "enable-method", &method)) | |
44 | return 0; | |
45 | ||
9a721c41 | 46 | for (; m->method; m++) |
6c3ff8b1 SB |
47 | if (!strcmp(m->method, method)) { |
48 | smp_set_ops(m->ops); | |
49 | return 1; | |
50 | } | |
51 | ||
52 | return 0; | |
53 | } | |
54 | #else | |
55 | static inline int set_smp_ops_by_method(struct device_node *node) | |
56 | { | |
57 | return 1; | |
58 | } | |
59 | #endif | |
60 | ||
61 | ||
a0ae0240 LP |
62 | /* |
63 | * arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree | |
64 | * and builds the cpu logical map array containing MPIDR values related to | |
65 | * logical cpus | |
66 | * | |
67 | * Updates the cpu possible mask with the number of parsed cpu nodes | |
68 | */ | |
69 | void __init arm_dt_init_cpu_maps(void) | |
70 | { | |
71 | /* | |
72 | * Temp logical map is initialized with UINT_MAX values that are | |
73 | * considered invalid logical map entries since the logical map must | |
74 | * contain a list of MPIDR[23:0] values where MPIDR[31:24] must | |
75 | * read as 0. | |
76 | */ | |
77 | struct device_node *cpu, *cpus; | |
6c3ff8b1 | 78 | int found_method = 0; |
a0ae0240 LP |
79 | u32 i, j, cpuidx = 1; |
80 | u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0; | |
81 | ||
18d7f152 | 82 | u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID }; |
a0ae0240 LP |
83 | bool bootcpu_valid = false; |
84 | cpus = of_find_node_by_path("/cpus"); | |
85 | ||
86 | if (!cpus) | |
87 | return; | |
88 | ||
d4866f75 | 89 | for_each_of_cpu_node(cpu) { |
ba6dea4f RM |
90 | const __be32 *cell; |
91 | int prop_bytes; | |
a0ae0240 LP |
92 | u32 hwid; |
93 | ||
a8e65e06 | 94 | pr_debug(" * %pOF...\n", cpu); |
a0ae0240 LP |
95 | /* |
96 | * A device tree containing CPU nodes with missing "reg" | |
97 | * properties is considered invalid to build the | |
98 | * cpu_logical_map. | |
99 | */ | |
ba6dea4f RM |
100 | cell = of_get_property(cpu, "reg", &prop_bytes); |
101 | if (!cell || prop_bytes < sizeof(*cell)) { | |
a8e65e06 | 102 | pr_debug(" * %pOF missing reg property\n", cpu); |
a4283e41 | 103 | of_node_put(cpu); |
a0ae0240 LP |
104 | return; |
105 | } | |
106 | ||
107 | /* | |
ba6dea4f | 108 | * Bits n:24 must be set to 0 in the DT since the reg property |
a0ae0240 LP |
109 | * defines the MPIDR[23:0]. |
110 | */ | |
ba6dea4f RM |
111 | do { |
112 | hwid = be32_to_cpu(*cell++); | |
113 | prop_bytes -= sizeof(*cell); | |
114 | } while (!hwid && prop_bytes > 0); | |
115 | ||
116 | if (prop_bytes || (hwid & ~MPIDR_HWID_BITMASK)) { | |
a4283e41 | 117 | of_node_put(cpu); |
a0ae0240 | 118 | return; |
a4283e41 | 119 | } |
a0ae0240 LP |
120 | |
121 | /* | |
122 | * Duplicate MPIDRs are a recipe for disaster. | |
123 | * Scan all initialized entries and check for | |
124 | * duplicates. If any is found just bail out. | |
125 | * temp values were initialized to UINT_MAX | |
126 | * to avoid matching valid MPIDR[23:0] values. | |
127 | */ | |
128 | for (j = 0; j < cpuidx; j++) | |
a4283e41 JL |
129 | if (WARN(tmp_map[j] == hwid, |
130 | "Duplicate /cpu reg properties in the DT\n")) { | |
131 | of_node_put(cpu); | |
a0ae0240 | 132 | return; |
a4283e41 | 133 | } |
a0ae0240 LP |
134 | |
135 | /* | |
136 | * Build a stashed array of MPIDR values. Numbering scheme | |
137 | * requires that if detected the boot CPU must be assigned | |
138 | * logical id 0. Other CPUs get sequential indexes starting | |
139 | * from 1. If a CPU node with a reg property matching the | |
140 | * boot CPU MPIDR is detected, this is recorded so that the | |
141 | * logical map built from DT is validated and can be used | |
142 | * to override the map created in smp_setup_processor_id(). | |
143 | */ | |
144 | if (hwid == mpidr) { | |
145 | i = 0; | |
146 | bootcpu_valid = true; | |
147 | } else { | |
148 | i = cpuidx++; | |
149 | } | |
150 | ||
ce7b1756 LP |
151 | if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than " |
152 | "max cores %u, capping them\n", | |
153 | cpuidx, nr_cpu_ids)) { | |
154 | cpuidx = nr_cpu_ids; | |
a4283e41 | 155 | of_node_put(cpu); |
a0ae0240 | 156 | break; |
ce7b1756 LP |
157 | } |
158 | ||
159 | tmp_map[i] = hwid; | |
6c3ff8b1 SB |
160 | |
161 | if (!found_method) | |
162 | found_method = set_smp_ops_by_method(cpu); | |
a0ae0240 LP |
163 | } |
164 | ||
6c3ff8b1 SB |
165 | /* |
166 | * Fallback to an enable-method in the cpus node if nothing found in | |
167 | * a cpu node. | |
168 | */ | |
169 | if (!found_method) | |
170 | set_smp_ops_by_method(cpus); | |
171 | ||
8d5bc1a6 OJ |
172 | if (!bootcpu_valid) { |
173 | pr_warn("DT missing boot CPU MPIDR[23:0], fall back to default cpu_logical_map\n"); | |
a0ae0240 | 174 | return; |
8d5bc1a6 | 175 | } |
a0ae0240 LP |
176 | |
177 | /* | |
178 | * Since the boot CPU node contains proper data, and all nodes have | |
179 | * a reg property, the DT CPU list can be considered valid and the | |
180 | * logical map created in smp_setup_processor_id() can be overridden | |
181 | */ | |
182 | for (i = 0; i < cpuidx; i++) { | |
183 | set_cpu_possible(i, true); | |
184 | cpu_logical_map(i) = tmp_map[i]; | |
185 | pr_debug("cpu logical map 0x%x\n", cpu_logical_map(i)); | |
186 | } | |
187 | } | |
188 | ||
973e02c1 SK |
189 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
190 | { | |
e44ef891 | 191 | return phys_id == cpu_logical_map(cpu); |
973e02c1 SK |
192 | } |
193 | ||
6d67a9f6 RH |
194 | static const void * __init arch_get_next_mach(const char *const **match) |
195 | { | |
196 | static const struct machine_desc *mdesc = __arch_info_begin; | |
197 | const struct machine_desc *m = mdesc; | |
198 | ||
199 | if (m >= __arch_info_end) | |
200 | return NULL; | |
201 | ||
202 | mdesc++; | |
203 | *match = m->dt_compat; | |
204 | return m; | |
205 | } | |
206 | ||
93c02ab4 GL |
207 | /** |
208 | * setup_machine_fdt - Machine setup when an dtb was passed to the kernel | |
209 | * @dt_phys: physical address of dt blob | |
210 | * | |
211 | * If a dtb was passed to the kernel in r2, then use it to choose the | |
212 | * correct machine_desc and to setup the system. | |
213 | */ | |
ff69a4c8 | 214 | const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) |
93c02ab4 | 215 | { |
ff69a4c8 | 216 | const struct machine_desc *mdesc, *mdesc_best = NULL; |
93c02ab4 | 217 | |
70722803 | 218 | #if defined(CONFIG_ARCH_MULTIPLATFORM) || defined(CONFIG_ARM_SINGLE_ARMV7M) |
883a106b | 219 | DT_MACHINE_START(GENERIC_DT, "Generic DT based system") |
cb6f8344 LW |
220 | .l2c_aux_val = 0x0, |
221 | .l2c_aux_mask = ~0x0, | |
883a106b AB |
222 | MACHINE_END |
223 | ||
ff69a4c8 | 224 | mdesc_best = &__mach_desc_GENERIC_DT; |
883a106b AB |
225 | #endif |
226 | ||
5a12a597 | 227 | if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys))) |
f506cd48 NP |
228 | return NULL; |
229 | ||
6d67a9f6 | 230 | mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach); |
93c02ab4 | 231 | |
6d67a9f6 | 232 | if (!mdesc) { |
93c02ab4 | 233 | const char *prop; |
9d0c4dfe | 234 | int size; |
6d67a9f6 | 235 | unsigned long dt_root; |
93c02ab4 GL |
236 | |
237 | early_print("\nError: unrecognized/unsupported " | |
238 | "device tree compatible list:\n[ "); | |
239 | ||
6d67a9f6 | 240 | dt_root = of_get_flat_dt_root(); |
93c02ab4 GL |
241 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); |
242 | while (size > 0) { | |
243 | early_print("'%s' ", prop); | |
244 | size -= strlen(prop) + 1; | |
245 | prop += strlen(prop) + 1; | |
246 | } | |
247 | early_print("]\n\n"); | |
248 | ||
249 | dump_machine_table(); /* does not return */ | |
250 | } | |
251 | ||
5a12a597 LA |
252 | /* We really don't want to do this, but sometimes firmware provides buggy data */ |
253 | if (mdesc->dt_fixup) | |
254 | mdesc->dt_fixup(); | |
255 | ||
256 | early_init_dt_scan_nodes(); | |
257 | ||
93c02ab4 | 258 | /* Change machine number to match the mdesc we're using */ |
6d67a9f6 | 259 | __machine_arch_type = mdesc->nr; |
93c02ab4 | 260 | |
6d67a9f6 | 261 | return mdesc; |
93c02ab4 | 262 | } |