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-rw-r--r--arch/arm/include/asm/arch-aspeed/scu_ast2500.h14
-rw-r--r--arch/arm/mach-aspeed/ast2500/clk_ast2500.c15
2 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-aspeed/scu_ast2500.h b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
index fc0c01ae33..0fa3ecb9b9 100644
--- a/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
+++ b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
@@ -120,6 +120,20 @@ int ast_get_clk(struct udevice **devp);
*/
void *ast_get_scu(void);
+/**
+ * ast_scu_unlock() - unlock protected registers
+ *
+ * @scu, pointer to ast2500_scu
+ */
+void ast_scu_unlock(struct ast2500_scu *scu);
+
+/**
+ * ast_scu_lock() - lock protected registers
+ *
+ * @scu, pointer to ast2500_scu
+ */
+void ast_scu_lock(struct ast2500_scu *scu);
+
#endif /* __ASSEMBLY__ */
#endif /* _ASM_ARCH_SCU_AST2500_H */
diff --git a/arch/arm/mach-aspeed/ast2500/clk_ast2500.c b/arch/arm/mach-aspeed/ast2500/clk_ast2500.c
index 079909fa64..30cfac1af0 100644
--- a/arch/arm/mach-aspeed/ast2500/clk_ast2500.c
+++ b/arch/arm/mach-aspeed/ast2500/clk_ast2500.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <dm.h>
+#include <asm/io.h>
#include <asm/arch/scu_ast2500.h>
int ast_get_clk(struct udevice **devp)
@@ -28,3 +29,17 @@ void *ast_get_scu(void)
return priv->scu;
}
+
+void ast_scu_unlock(struct ast2500_scu *scu)
+{
+ writel(SCU_UNLOCK_VALUE, &scu->protection_key);
+ while (!readl(&scu->protection_key))
+ ;
+}
+
+void ast_scu_lock(struct ast2500_scu *scu)
+{
+ writel(~SCU_UNLOCK_VALUE, &scu->protection_key);
+ while (readl(&scu->protection_key))
+ ;
+}