blob: e3057c1b55b9643c449d78c599096baba91b6de0 [file] [log] [blame]
Grant Likely9eb8f672011-04-28 14:27:20 -06001/*
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>
Paul Gortmakerecea4ab2011-07-22 10:58:34 -040012#include <linux/export.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060013#include <linux/errno.h>
14#include <linux/types.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060015#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>
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070020#include <linux/smp.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060021
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000022#include <asm/cputype.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060023#include <asm/setup.h>
24#include <asm/page.h>
Ben Dooks2374b062016-06-17 18:21:07 +010025#include <asm/prom.h>
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000026#include <asm/smp_plat.h>
Grant Likely93c02ab2011-04-28 14:27:21 -060027#include <asm/mach/arch.h>
28#include <asm/mach-types.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060029
Grant Likely9eb8f672011-04-28 14:27:20 -060030
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070031#ifdef CONFIG_SMP
Rob Herring9a721c42014-03-24 16:11:54 -050032extern struct of_cpu_method __cpu_method_of_table[];
33
34static const struct of_cpu_method __cpu_method_of_table_sentinel
35 __used __section(__cpu_method_of_table_end);
36
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070037
38static int __init set_smp_ops_by_method(struct device_node *node)
39{
40 const char *method;
Rob Herring9a721c42014-03-24 16:11:54 -050041 struct of_cpu_method *m = __cpu_method_of_table;
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070042
43 if (of_property_read_string(node, "enable-method", &method))
44 return 0;
45
Rob Herring9a721c42014-03-24 16:11:54 -050046 for (; m->method; m++)
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070047 if (!strcmp(m->method, method)) {
48 smp_set_ops(m->ops);
49 return 1;
50 }
51
52 return 0;
53}
54#else
55static inline int set_smp_ops_by_method(struct device_node *node)
56{
57 return 1;
58}
59#endif
60
61
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000062/*
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 */
69void __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;
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -070078 int found_method = 0;
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000079 u32 i, j, cpuidx = 1;
80 u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
81
Lorenzo Pieralisi18d7f152013-06-19 10:40:48 +010082 u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000083 bool bootcpu_valid = false;
84 cpus = of_find_node_by_path("/cpus");
85
86 if (!cpus)
87 return;
88
Rob Herringd4866f72018-08-27 10:53:34 -050089 for_each_of_cpu_node(cpu) {
Robin Murphyba6dea42016-09-26 16:50:55 +010090 const __be32 *cell;
91 int prop_bytes;
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000092 u32 hwid;
93
Rob Herringa8e65e02017-07-21 14:28:32 -050094 pr_debug(" * %pOF...\n", cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +000095 /*
96 * A device tree containing CPU nodes with missing "reg"
97 * properties is considered invalid to build the
98 * cpu_logical_map.
99 */
Robin Murphyba6dea42016-09-26 16:50:55 +0100100 cell = of_get_property(cpu, "reg", &prop_bytes);
101 if (!cell || prop_bytes < sizeof(*cell)) {
Rob Herringa8e65e02017-07-21 14:28:32 -0500102 pr_debug(" * %pOF missing reg property\n", cpu);
Julia Lawalla4283e42015-10-10 23:41:42 +0200103 of_node_put(cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000104 return;
105 }
106
107 /*
Robin Murphyba6dea42016-09-26 16:50:55 +0100108 * Bits n:24 must be set to 0 in the DT since the reg property
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000109 * defines the MPIDR[23:0].
110 */
Robin Murphyba6dea42016-09-26 16:50:55 +0100111 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)) {
Julia Lawalla4283e42015-10-10 23:41:42 +0200117 of_node_put(cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000118 return;
Julia Lawalla4283e42015-10-10 23:41:42 +0200119 }
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000120
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++)
Julia Lawalla4283e42015-10-10 23:41:42 +0200129 if (WARN(tmp_map[j] == hwid,
130 "Duplicate /cpu reg properties in the DT\n")) {
131 of_node_put(cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000132 return;
Julia Lawalla4283e42015-10-10 23:41:42 +0200133 }
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000134
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
Lorenzo Pieralisice7b1752012-11-22 18:02:54 +0100151 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;
Julia Lawalla4283e42015-10-10 23:41:42 +0200155 of_node_put(cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000156 break;
Lorenzo Pieralisice7b1752012-11-22 18:02:54 +0100157 }
158
159 tmp_map[i] = hwid;
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -0700160
161 if (!found_method)
162 found_method = set_smp_ops_by_method(cpu);
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000163 }
164
Stephen Boyd6c3ff8b2013-10-30 18:21:09 -0700165 /*
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
Olof Johansson8d5bc1a2013-06-29 16:25:14 -0700172 if (!bootcpu_valid) {
173 pr_warn("DT missing boot CPU MPIDR[23:0], fall back to default cpu_logical_map\n");
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000174 return;
Olof Johansson8d5bc1a2013-06-29 16:25:14 -0700175 }
Lorenzo Pieralisia0ae02402011-11-17 17:31:51 +0000176
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
Sudeep KarkadaNagesha973e02c2013-06-17 13:11:29 +0100189bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
190{
Sudeep Hollae44ef892014-01-08 18:24:21 +0100191 return phys_id == cpu_logical_map(cpu);
Sudeep KarkadaNagesha973e02c2013-06-17 13:11:29 +0100192}
193
Rob Herring6d67a9f2013-08-27 21:43:49 -0500194static 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
Grant Likely93c02ab2011-04-28 14:27:21 -0600207/**
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 */
Russell Kingff69a4c2013-07-26 14:55:59 +0100214const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
Grant Likely93c02ab2011-04-28 14:27:21 -0600215{
Russell Kingff69a4c2013-07-26 14:55:59 +0100216 const struct machine_desc *mdesc, *mdesc_best = NULL;
Grant Likely93c02ab2011-04-28 14:27:21 -0600217
Arnd Bergmann70722802015-12-17 17:45:47 +0100218#if defined(CONFIG_ARCH_MULTIPLATFORM) || defined(CONFIG_ARM_SINGLE_ARMV7M)
Arnd Bergmann883a1062013-01-31 17:51:18 +0000219 DT_MACHINE_START(GENERIC_DT, "Generic DT based system")
Linus Walleijcb6f8342016-04-04 09:22:28 +0100220 .l2c_aux_val = 0x0,
221 .l2c_aux_mask = ~0x0,
Arnd Bergmann883a1062013-01-31 17:51:18 +0000222 MACHINE_END
223
Russell Kingff69a4c2013-07-26 14:55:59 +0100224 mdesc_best = &__mach_desc_GENERIC_DT;
Arnd Bergmann883a1062013-01-31 17:51:18 +0000225#endif
226
Laura Abbott5a12a5972014-07-15 10:03:36 -0700227 if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys)))
Nicolas Pitref506cd42011-06-09 04:58:36 +0100228 return NULL;
229
Rob Herring6d67a9f2013-08-27 21:43:49 -0500230 mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
Grant Likely93c02ab2011-04-28 14:27:21 -0600231
Rob Herring6d67a9f2013-08-27 21:43:49 -0500232 if (!mdesc) {
Grant Likely93c02ab2011-04-28 14:27:21 -0600233 const char *prop;
Rob Herring9d0c4df2014-04-01 23:49:03 -0500234 int size;
Rob Herring6d67a9f2013-08-27 21:43:49 -0500235 unsigned long dt_root;
Grant Likely93c02ab2011-04-28 14:27:21 -0600236
237 early_print("\nError: unrecognized/unsupported "
238 "device tree compatible list:\n[ ");
239
Rob Herring6d67a9f2013-08-27 21:43:49 -0500240 dt_root = of_get_flat_dt_root();
Grant Likely93c02ab2011-04-28 14:27:21 -0600241 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
Laura Abbott5a12a5972014-07-15 10:03:36 -0700252 /* 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
Grant Likely93c02ab2011-04-28 14:27:21 -0600258 /* Change machine number to match the mdesc we're using */
Rob Herring6d67a9f2013-08-27 21:43:49 -0500259 __machine_arch_type = mdesc->nr;
Grant Likely93c02ab2011-04-28 14:27:21 -0600260
Rob Herring6d67a9f2013-08-27 21:43:49 -0500261 return mdesc;
Grant Likely93c02ab2011-04-28 14:27:21 -0600262}