arm64: introduce CPU_OF_TABLES for cpu ops selection

Add support to arm64 to provide a dt-based method to
allow soc-vendors to supply cpu_ops. Also move psci and
smp_spin_table ops to use CPU_OF_TABLES.

Change-Id: I4fd5b330fa3a7436fb88fff385deeb80a90548d6
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>

1 files changed, 9 insertions, 18 deletions

diff --git a/arch/arm64/kernel/cpu_ops.c b/arch/arm64/kernel/cpu_ops.c
index cce952440c6..ad33f980249 100644
--- a/arch/arm64/kernel/cpu_ops.c
+++ b/arch/arm64/kernel/cpu_ops.c
@@ -22,29 +22,20 @@
 #include <linux/of.h>
 #include <linux/string.h>
 
-extern const struct cpu_operations smp_spin_table_ops;
-extern const struct cpu_operations cpu_psci_ops;
-
 const struct cpu_operations *cpu_ops[NR_CPUS];
 
-static const struct cpu_operations *supported_cpu_ops[] __initconst = {
-#ifdef CONFIG_SMP
-	&smp_spin_table_ops,
-#endif
-	&cpu_psci_ops,
-	NULL,
-};
+extern struct cpu_operations __cpu_method_of_table[];
+static const struct cpu_operations *__cpu_method_of_table_sentinel
+	__used __section(__cpu_method_of_table_end);
 
-static const struct cpu_operations * __init cpu_get_ops(const char *name)
+const struct cpu_operations * __init cpu_get_ops(const char *name)
 {
-	const struct cpu_operations **ops = supported_cpu_ops;
-
-	while (*ops) {
-		if (!strcmp(name, (*ops)->name))
-			return *ops;
+	const struct cpu_operations **start = (void *)__cpu_method_of_table;
 
-		ops++;
-	}
+	for (; *start; start++) {
+		if (!strcmp((*start)->name, name))
+			return *start;
+	};
 
 	return NULL;
 }