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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>
12#include <linux/export.h>
13#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/bootmem.h>
16#include <linux/memblock.h>
17#include <linux/of.h>
18#include <linux/of_fdt.h>
19#include <linux/of_irq.h>
20#include <linux/of_platform.h>
21#include <linux/smp.h>
22
23#include <asm/cputype.h>
24#include <asm/setup.h>
25#include <asm/page.h>
26#include <asm/prom.h>
27#include <asm/smp_plat.h>
28#include <asm/mach/arch.h>
29#include <asm/mach-types.h>
30
31
32#ifdef CONFIG_SMP
33extern struct of_cpu_method __cpu_method_of_table[];
34
35static const struct of_cpu_method __cpu_method_of_table_sentinel
36 __used __section(__cpu_method_of_table_end);
37
38
39static int __init set_smp_ops_by_method(struct device_node *node)
40{
41 const char *method;
42 struct of_cpu_method *m = __cpu_method_of_table;
43
44 if (of_property_read_string(node, "enable-method", &method))
45 return 0;
46
47 for (; m->method; m++)
48 if (!strcmp(m->method, method)) {
49 smp_set_ops(m->ops);
50 return 1;
51 }
52
53 return 0;
54}
55#else
56static inline int set_smp_ops_by_method(struct device_node *node)
57{
58 return 1;
59}
60#endif
61
62
63/*
64 * arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree
65 * and builds the cpu logical map array containing MPIDR values related to
66 * logical cpus
67 *
68 * Updates the cpu possible mask with the number of parsed cpu nodes
69 */
70void __init arm_dt_init_cpu_maps(void)
71{
72 /*
73 * Temp logical map is initialized with UINT_MAX values that are
74 * considered invalid logical map entries since the logical map must
75 * contain a list of MPIDR[23:0] values where MPIDR[31:24] must
76 * read as 0.
77 */
78 struct device_node *cpu, *cpus;
79 int found_method = 0;
80 u32 i, j, cpuidx = 1;
81 u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
82
83 u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
84 bool bootcpu_valid = false;
85 cpus = of_find_node_by_path("/cpus");
86
87 if (!cpus)
88 return;
89
90 for_each_child_of_node(cpus, cpu) {
91 const __be32 *cell;
92 int prop_bytes;
93 u32 hwid;
94
95 if (of_node_cmp(cpu->type, "cpu"))
96 continue;
97
98 pr_debug(" * %s...\n", cpu->full_name);
99 /*
100 * A device tree containing CPU nodes with missing "reg"
101 * properties is considered invalid to build the
102 * cpu_logical_map.
103 */
104 cell = of_get_property(cpu, "reg", &prop_bytes);
105 if (!cell || prop_bytes < sizeof(*cell)) {
106 pr_debug(" * %s missing reg property\n",
107 cpu->full_name);
108 of_node_put(cpu);
109 return;
110 }
111
112 /*
113 * Bits n:24 must be set to 0 in the DT since the reg property
114 * defines the MPIDR[23:0].
115 */
116 do {
117 hwid = be32_to_cpu(*cell++);
118 prop_bytes -= sizeof(*cell);
119 } while (!hwid && prop_bytes > 0);
120
121 if (prop_bytes || (hwid & ~MPIDR_HWID_BITMASK)) {
122 of_node_put(cpu);
123 return;
124 }
125
126 /*
127 * Duplicate MPIDRs are a recipe for disaster.
128 * Scan all initialized entries and check for
129 * duplicates. If any is found just bail out.
130 * temp values were initialized to UINT_MAX
131 * to avoid matching valid MPIDR[23:0] values.
132 */
133 for (j = 0; j < cpuidx; j++)
134 if (WARN(tmp_map[j] == hwid,
135 "Duplicate /cpu reg properties in the DT\n")) {
136 of_node_put(cpu);
137 return;
138 }
139
140 /*
141 * Build a stashed array of MPIDR values. Numbering scheme
142 * requires that if detected the boot CPU must be assigned
143 * logical id 0. Other CPUs get sequential indexes starting
144 * from 1. If a CPU node with a reg property matching the
145 * boot CPU MPIDR is detected, this is recorded so that the
146 * logical map built from DT is validated and can be used
147 * to override the map created in smp_setup_processor_id().
148 */
149 if (hwid == mpidr) {
150 i = 0;
151 bootcpu_valid = true;
152 } else {
153 i = cpuidx++;
154 }
155
156 if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than "
157 "max cores %u, capping them\n",
158 cpuidx, nr_cpu_ids)) {
159 cpuidx = nr_cpu_ids;
160 of_node_put(cpu);
161 break;
162 }
163
164 tmp_map[i] = hwid;
165
166 if (!found_method)
167 found_method = set_smp_ops_by_method(cpu);
168 }
169
170 /*
171 * Fallback to an enable-method in the cpus node if nothing found in
172 * a cpu node.
173 */
174 if (!found_method)
175 set_smp_ops_by_method(cpus);
176
177 if (!bootcpu_valid) {
178 pr_warn("DT missing boot CPU MPIDR[23:0], fall back to default cpu_logical_map\n");
179 return;
180 }
181
182 /*
183 * Since the boot CPU node contains proper data, and all nodes have
184 * a reg property, the DT CPU list can be considered valid and the
185 * logical map created in smp_setup_processor_id() can be overridden
186 */
187 for (i = 0; i < cpuidx; i++) {
188 set_cpu_possible(i, true);
189 cpu_logical_map(i) = tmp_map[i];
190 pr_debug("cpu logical map 0x%x\n", cpu_logical_map(i));
191 }
192}
193
194bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
195{
196 return phys_id == cpu_logical_map(cpu);
197}
198
199static const void * __init arch_get_next_mach(const char *const **match)
200{
201 static const struct machine_desc *mdesc = __arch_info_begin;
202 const struct machine_desc *m = mdesc;
203
204 if (m >= __arch_info_end)
205 return NULL;
206
207 mdesc++;
208 *match = m->dt_compat;
209 return m;
210}
211
212/**
213 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
214 * @dt_phys: physical address of dt blob
215 *
216 * If a dtb was passed to the kernel in r2, then use it to choose the
217 * correct machine_desc and to setup the system.
218 */
219const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
220{
221 const struct machine_desc *mdesc, *mdesc_best = NULL;
222
223#if defined(CONFIG_ARCH_MULTIPLATFORM) || defined(CONFIG_ARM_SINGLE_ARMV7M)
224 DT_MACHINE_START(GENERIC_DT, "Generic DT based system")
225 .l2c_aux_val = 0x0,
226 .l2c_aux_mask = ~0x0,
227 MACHINE_END
228
229 mdesc_best = &__mach_desc_GENERIC_DT;
230#endif
231
232 if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys)))
233 return NULL;
234
235 mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
236
237 if (!mdesc) {
238 const char *prop;
239 int size;
240 unsigned long dt_root;
241
242 early_print("\nError: unrecognized/unsupported "
243 "device tree compatible list:\n[ ");
244
245 dt_root = of_get_flat_dt_root();
246 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
247 while (size > 0) {
248 early_print("'%s' ", prop);
249 size -= strlen(prop) + 1;
250 prop += strlen(prop) + 1;
251 }
252 early_print("]\n\n");
253
254 dump_machine_table(); /* does not return */
255 }
256
257 /* We really don't want to do this, but sometimes firmware provides buggy data */
258 if (mdesc->dt_fixup)
259 mdesc->dt_fixup();
260
261 early_init_dt_scan_nodes();
262
263 /* Change machine number to match the mdesc we're using */
264 __machine_arch_type = mdesc->nr;
265
266 return mdesc;
267}
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>
12#include <linux/export.h>
13#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/bootmem.h>
16#include <linux/memblock.h>
17#include <linux/of.h>
18#include <linux/of_fdt.h>
19#include <linux/of_irq.h>
20#include <linux/of_platform.h>
21#include <linux/smp.h>
22
23#include <asm/cputype.h>
24#include <asm/setup.h>
25#include <asm/page.h>
26#include <asm/smp_plat.h>
27#include <asm/mach/arch.h>
28#include <asm/mach-types.h>
29
30void __init early_init_dt_add_memory_arch(u64 base, u64 size)
31{
32 arm_add_memory(base, size);
33}
34
35void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
36{
37 return memblock_virt_alloc(size, align);
38}
39
40void __init arm_dt_memblock_reserve(void)
41{
42 u64 *reserve_map, base, size;
43
44 if (!initial_boot_params)
45 return;
46
47 /* Reserve the dtb region */
48 memblock_reserve(virt_to_phys(initial_boot_params),
49 be32_to_cpu(initial_boot_params->totalsize));
50
51 /*
52 * Process the reserve map. This will probably overlap the initrd
53 * and dtb locations which are already reserved, but overlaping
54 * doesn't hurt anything
55 */
56 reserve_map = ((void*)initial_boot_params) +
57 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
58 while (1) {
59 base = be64_to_cpup(reserve_map++);
60 size = be64_to_cpup(reserve_map++);
61 if (!size)
62 break;
63 memblock_reserve(base, size);
64 }
65}
66
67#ifdef CONFIG_SMP
68extern struct of_cpu_method __cpu_method_of_table_begin[];
69extern struct of_cpu_method __cpu_method_of_table_end[];
70
71static int __init set_smp_ops_by_method(struct device_node *node)
72{
73 const char *method;
74 struct of_cpu_method *m = __cpu_method_of_table_begin;
75
76 if (of_property_read_string(node, "enable-method", &method))
77 return 0;
78
79 for (; m < __cpu_method_of_table_end; m++)
80 if (!strcmp(m->method, method)) {
81 smp_set_ops(m->ops);
82 return 1;
83 }
84
85 return 0;
86}
87#else
88static inline int set_smp_ops_by_method(struct device_node *node)
89{
90 return 1;
91}
92#endif
93
94
95/*
96 * arm_dt_init_cpu_maps - Function retrieves cpu nodes from the device tree
97 * and builds the cpu logical map array containing MPIDR values related to
98 * logical cpus
99 *
100 * Updates the cpu possible mask with the number of parsed cpu nodes
101 */
102void __init arm_dt_init_cpu_maps(void)
103{
104 /*
105 * Temp logical map is initialized with UINT_MAX values that are
106 * considered invalid logical map entries since the logical map must
107 * contain a list of MPIDR[23:0] values where MPIDR[31:24] must
108 * read as 0.
109 */
110 struct device_node *cpu, *cpus;
111 int found_method = 0;
112 u32 i, j, cpuidx = 1;
113 u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
114
115 u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
116 bool bootcpu_valid = false;
117 cpus = of_find_node_by_path("/cpus");
118
119 if (!cpus)
120 return;
121
122 for_each_child_of_node(cpus, cpu) {
123 u32 hwid;
124
125 if (of_node_cmp(cpu->type, "cpu"))
126 continue;
127
128 pr_debug(" * %s...\n", cpu->full_name);
129 /*
130 * A device tree containing CPU nodes with missing "reg"
131 * properties is considered invalid to build the
132 * cpu_logical_map.
133 */
134 if (of_property_read_u32(cpu, "reg", &hwid)) {
135 pr_debug(" * %s missing reg property\n",
136 cpu->full_name);
137 return;
138 }
139
140 /*
141 * 8 MSBs must be set to 0 in the DT since the reg property
142 * defines the MPIDR[23:0].
143 */
144 if (hwid & ~MPIDR_HWID_BITMASK)
145 return;
146
147 /*
148 * Duplicate MPIDRs are a recipe for disaster.
149 * Scan all initialized entries and check for
150 * duplicates. If any is found just bail out.
151 * temp values were initialized to UINT_MAX
152 * to avoid matching valid MPIDR[23:0] values.
153 */
154 for (j = 0; j < cpuidx; j++)
155 if (WARN(tmp_map[j] == hwid, "Duplicate /cpu reg "
156 "properties in the DT\n"))
157 return;
158
159 /*
160 * Build a stashed array of MPIDR values. Numbering scheme
161 * requires that if detected the boot CPU must be assigned
162 * logical id 0. Other CPUs get sequential indexes starting
163 * from 1. If a CPU node with a reg property matching the
164 * boot CPU MPIDR is detected, this is recorded so that the
165 * logical map built from DT is validated and can be used
166 * to override the map created in smp_setup_processor_id().
167 */
168 if (hwid == mpidr) {
169 i = 0;
170 bootcpu_valid = true;
171 } else {
172 i = cpuidx++;
173 }
174
175 if (WARN(cpuidx > nr_cpu_ids, "DT /cpu %u nodes greater than "
176 "max cores %u, capping them\n",
177 cpuidx, nr_cpu_ids)) {
178 cpuidx = nr_cpu_ids;
179 break;
180 }
181
182 tmp_map[i] = hwid;
183
184 if (!found_method)
185 found_method = set_smp_ops_by_method(cpu);
186 }
187
188 /*
189 * Fallback to an enable-method in the cpus node if nothing found in
190 * a cpu node.
191 */
192 if (!found_method)
193 set_smp_ops_by_method(cpus);
194
195 if (!bootcpu_valid) {
196 pr_warn("DT missing boot CPU MPIDR[23:0], fall back to default cpu_logical_map\n");
197 return;
198 }
199
200 /*
201 * Since the boot CPU node contains proper data, and all nodes have
202 * a reg property, the DT CPU list can be considered valid and the
203 * logical map created in smp_setup_processor_id() can be overridden
204 */
205 for (i = 0; i < cpuidx; i++) {
206 set_cpu_possible(i, true);
207 cpu_logical_map(i) = tmp_map[i];
208 pr_debug("cpu logical map 0x%x\n", cpu_logical_map(i));
209 }
210}
211
212bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
213{
214 return phys_id == cpu_logical_map(cpu);
215}
216
217static const void * __init arch_get_next_mach(const char *const **match)
218{
219 static const struct machine_desc *mdesc = __arch_info_begin;
220 const struct machine_desc *m = mdesc;
221
222 if (m >= __arch_info_end)
223 return NULL;
224
225 mdesc++;
226 *match = m->dt_compat;
227 return m;
228}
229
230/**
231 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
232 * @dt_phys: physical address of dt blob
233 *
234 * If a dtb was passed to the kernel in r2, then use it to choose the
235 * correct machine_desc and to setup the system.
236 */
237const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
238{
239 const struct machine_desc *mdesc, *mdesc_best = NULL;
240
241#ifdef CONFIG_ARCH_MULTIPLATFORM
242 DT_MACHINE_START(GENERIC_DT, "Generic DT based system")
243 MACHINE_END
244
245 mdesc_best = &__mach_desc_GENERIC_DT;
246#endif
247
248 if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys)))
249 return NULL;
250
251 mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
252
253 if (!mdesc) {
254 const char *prop;
255 long size;
256 unsigned long dt_root;
257
258 early_print("\nError: unrecognized/unsupported "
259 "device tree compatible list:\n[ ");
260
261 dt_root = of_get_flat_dt_root();
262 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
263 while (size > 0) {
264 early_print("'%s' ", prop);
265 size -= strlen(prop) + 1;
266 prop += strlen(prop) + 1;
267 }
268 early_print("]\n\n");
269
270 dump_machine_table(); /* does not return */
271 }
272
273 /* Change machine number to match the mdesc we're using */
274 __machine_arch_type = mdesc->nr;
275
276 return mdesc;
277}