S3C: CPU detection support

Stroe the CPU ID to system_rev and use it to detect the CPU architecture.

Even though s3c64xx has almost same IPs, some IPs such as OneNAND are different.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 189 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c/include/mach/cpu.h b/arch/arm/plat-s3c/include/mach/cpu.h
new file mode 100644
index 00000000000..81571a2da7a
--- /dev/null
+++ b/arch/arm/plat-s3c/include/mach/cpu.h
@@ -0,0 +1,162 @@
+/*
+ * arch/arm/plat-s3c/include/mach/cpu.h
+ *
+ *  S3C cpu type detection
+ *
+ *  Copyright (C) 2008 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ * Derived from OMAP cpu.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __ASM_ARCH_S3C_CPU_H
+#define __ASM_ARCH_S3C_CPU_H
+
+extern unsigned int system_rev;
+
+/*
+ * cpu_is_s3c24xx():	True for s3c2400, s3c2410, s3c2440 and so on
+ * cpu_is_s3c241x():	True fro s3c2410, s3c2412
+ * cpu_is_s3c244x():	True fro s3c2440, s3c2442, s3c2443
+ * cpu_is_s3c64xx():	True for s3c6400, s3c6410
+ */
+#define GET_S3C_CLASS	((system_rev >> 24) & 0xff)
+
+#define IS_S3C_CLASS(class, id)						\
+static inline int is_s3c ##class (void)					\
+{									\
+	return (GET_S3C_CLASS == (id)) ? 1 : 0;				\
+}
+
+#define GET_S3C_SUBCLASS	((system_rev >> 20) & 0xfff)
+
+#define IS_S3C_SUBCLASS(subclass, id)					\
+static inline int is_s3c ##subclass (void)				\
+{									\
+	return (GET_S3C_SUBCLASS == (id)) ? 1 : 0;			\
+}
+
+IS_S3C_CLASS(24xx, 0x24)
+IS_S3C_CLASS(64xx, 0x64)
+
+IS_S3C_SUBCLASS(241x, 0x241)
+IS_S3C_SUBCLASS(244x, 0x244)
+
+#define cpu_is_s3c24xx()		0
+#define cpu_is_s3c241x()		0
+#define cpu_is_s3c244x()		0
+#define cpu_is_s3c64xx()		0
+
+#if defined(CONFIG_ARCH_S3C2410)
+# undef  cpu_is_s3c24xx
+# undef  cpu_is_s3c241x
+# undef  cpu_is_s3c244x
+# define cpu_is_s3c24xx()		is_s3c24xx()
+# define cpu_is_s3c241x()		is_s3c241x()
+# define cpu_is_s3c244x()		is_s3c244x()
+#endif
+
+#if defined(CONFIG_ARCH_S3C64XX)
+# undef  cpu_is_s3c64xx
+# define cpu_is_s3c64xx()		is_s3c64xx()
+#endif
+
+/*
+ * Macros to detect individual cpu types.
+ * cpu_is_s3c2410():	True for s3c2410
+ * cpu_is_s3c2440():	True for s3c2440
+ * cpu_is_s3c6400():	True for s3c6400
+ * cpu_is_s3c6410():	True for s3c6410
+ *
+ * Exception:
+ * Store Revision A to 1
+ * s3c2410a -> s3c2411
+ * s3c2440a -> s3c2441
+ */
+
+#define GET_S3C_TYPE	((system_rev >> 16) & 0xffff)
+
+#define IS_S3C_TYPE(type, id)						\
+static inline int is_s3c ##type (void)					\
+{									\
+	return (GET_S3C_TYPE == (id)) ? 1 : 0;				\
+}
+
+IS_S3C_TYPE(2400, 0x2400)
+IS_S3C_TYPE(2410, 0x2410)
+IS_S3C_TYPE(2410a, 0x2411)
+IS_S3C_TYPE(2412, 0x2412)
+IS_S3C_TYPE(2440, 0x2440)
+IS_S3C_TYPE(2440a, 0x2441)
+IS_S3C_TYPE(2442, 0x2442)
+IS_S3C_TYPE(2443, 0x2443)
+IS_S3C_TYPE(6400, 0x6400)
+IS_S3C_TYPE(6410, 0x6410)
+
+#define cpu_is_s3c2400()		0
+#define cpu_is_s3c2410()		0
+#define cpu_is_s3c2410a()		0
+#define cpu_is_s3c2412()		0
+#define cpu_is_s3c2440()		0
+#define cpu_is_s3c2440a()		0
+#define cpu_is_s3c2442()		0
+#define cpu_is_s3c2443()		0
+#define cpu_is_s3c6400()		0
+#define cpu_is_s3c6410()		0
+
+#if defined(CONFIG_ARCH_S3C2410)
+# undef  cpu_is_s3c2400
+# define cpu_is_s3c2400()		is_s3c2400()
+#endif
+
+#if defined(CONFIG_CPU_S3C2410)
+# undef  cpu_is_s3c2410
+# undef  cpu_is_s3c2410a
+# define cpu_is_s3c2410()		is_s3c2410()
+# define cpu_is_s3c2410a()		is_s3c2410a()
+#endif
+
+#if defined(CONFIG_CPU_S3C2412)
+# undef  cpu_is_s3c2412
+# define cpu_is_s3c2412()		is_s3c2412()
+#endif
+
+#if defined(CONFIG_CPU_S3C2440)
+# undef  cpu_is_s3c2440
+# undef  cpu_is_s3c2440a
+# define cpu_is_s3c2440()		is_s3c2440()
+# define cpu_is_s3c2440a()		is_s3c2440a()
+#endif
+
+#if defined(CONFIG_CPU_S3C2442)
+# undef  cpu_is_s3c2442
+# define cpu_is_s3c2442()		is_s3c2442()
+#endif
+
+#if defined(CONFIG_CPU_S3C2443)
+# undef  cpu_is_s3c2443
+# define cpu_is_s3c2443()		is_s3c2443()
+#endif
+
+#if defined(CONFIG_ARCH_S3C64XX)
+# undef  cpu_is_s3c6400
+# undef  cpu_is_s3c6410
+# define cpu_is_s3c6400()		is_s3c6400()
+# define cpu_is_s3c6410()		is_s3c6410()
+#endif
+
+#endif
diff --git a/arch/arm/plat-s3c/init.c b/arch/arm/plat-s3c/init.c
index 6790edfaca6..f63ff9c86c3 100644
--- a/arch/arm/plat-s3c/init.c
+++ b/arch/arm/plat-s3c/init.c
@@ -31,6 +31,31 @@
 
 static struct cpu_table *cpu;
 
+static void __init set_system_rev(unsigned int idcode)
+{
+	/*
+	 * system_rev encoding is as follows
+	 * system_rev & 0xff000000 -> S3C Class (24xx/64xx)
+	 * system_rev & 0xfff00000 -> S3C Sub Class (241x/244x)
+	 * system_rev & 0xffff0000 -> S3C Type (2410/2440/6400/6410)
+	 *
+	 * Remains[15:0] are reserved
+	 *
+	 * Exception:
+	 *  Store Revision A to 1 such as
+	 *  s3c2410A to s3c2411
+	 *  s3c2440A to s3c2441
+	 */
+	system_rev = (idcode & 0x0ffff000) << 4;
+
+	if (idcode == 0x32410002 || idcode == 0x32440001)
+		system_rev |= (0x1 << 16);
+	if (idcode == 0x32440aaa)	/* s3c2442 */
+		system_rev |= (0x2 << 16);
+	if (idcode == 0x0)		/* s3c2400 */
+		system_rev |= (0x2400 << 16);
+}
+
 static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
 						struct cpu_table *tab,
 						unsigned int count)
@@ -53,6 +78,8 @@ void __init s3c_init_cpu(unsigned long idcode,
 		panic("Unknown S3C24XX CPU");
 	}
 
+	set_system_rev(idcode);
+
 	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
 
 	if (cpu->map_io == NULL || cpu->init == NULL) {