Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / plat-samsung / cpu.c

diff --git a/kernel/arch/arm/plat-samsung/cpu.c b/kernel/arch/arm/plat-samsung/cpu.c
new file mode 100644 (file)
index 0000000..71333bb
--- /dev/null
+++ b/kernel/arch/arm/plat-samsung/cpu.c
@@ -0,0 +1,53 @@
+/* linux/arch/arm/plat-samsung/cpu.c
+ *
+ * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
+ *             http://www.samsung.com
+ *
+ * Samsung CPU Support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <plat/map-base.h>
+#include <plat/cpu.h>
+
+unsigned long samsung_cpu_id;
+static unsigned int samsung_cpu_rev;
+
+unsigned int samsung_rev(void)
+{
+       return samsung_cpu_rev;
+}
+EXPORT_SYMBOL(samsung_rev);
+
+void __init s3c64xx_init_cpu(void)
+{
+       samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0x118);
+       if (!samsung_cpu_id) {
+               /*
+                * S3C6400 has the ID register in a different place,
+                * and needs a write before it can be read.
+                */
+               __raw_writel(0x0, S3C_VA_SYS + 0xA1C);
+               samsung_cpu_id = __raw_readl(S3C_VA_SYS + 0xA1C);
+       }
+
+       samsung_cpu_rev = 0;
+
+       pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
+}
+
+void __init s5p_init_cpu(void __iomem *cpuid_addr)
+{
+       samsung_cpu_id = __raw_readl(cpuid_addr);
+       samsung_cpu_rev = samsung_cpu_id & 0xFF;
+
+       pr_info("Samsung CPU ID: 0x%08lx\n", samsung_cpu_id);
+}