ARM: SAMSUNG: Add support for handling of cpu revision

This patch adds plat-samsung/cpu.c for detecting of cpu id and
silicon revision.

This patch was originally from Changhwan Youn <chaos.youn@samsung.com>

Acked-by: Changhwan Youn <chaos.youn@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/arch/arm/mach-s3c64xx/cpu.c b/arch/arm/mach-s3c64xx/cpu.c
index 7b665f3..6c498f9 100644 (file)
--- a/arch/arm/mach-s3c64xx/cpu.c
+++ b/arch/arm/mach-s3c64xx/cpu.c
@@ -144,14 +144,8 @@ void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
        iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
        iotable_init(mach_desc, size);
 
-       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);
-       }
+       /* detect cpu id */
+       s3c64xx_init_cpu();
 
        s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 }

diff --git a/arch/arm/plat-s3c24xx/cpu.c b/arch/arm/plat-s3c24xx/cpu.c
index ead21a4..3c63353 100644 (file)
--- a/arch/arm/plat-s3c24xx/cpu.c
+++ b/arch/arm/plat-s3c24xx/cpu.c
@@ -224,6 +224,7 @@ void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
        } else {
                samsung_cpu_id = s3c24xx_read_idcode_v4();
        }
+       s3c24xx_init_cpu();
 
        arm_pm_restart = s3c24xx_pm_restart;
 

diff --git a/arch/arm/plat-s5p/cpu.c b/arch/arm/plat-s5p/cpu.c
index 3ef6734..04392c7 100644 (file)
--- a/arch/arm/plat-s5p/cpu.c
+++ b/arch/arm/plat-s5p/cpu.c
@@ -119,6 +119,8 @@ void __init s5p_init_io(struct map_desc *mach_desc,
        if (mach_desc)
                iotable_init(mach_desc, size);
 
-       samsung_cpu_id = __raw_readl(cpuid_addr);
+       /* detect cpu id and rev. */
+       s5p_init_cpu(cpuid_addr);
+
        s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 }

diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 853764b..3de756d 100644 (file)
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -11,7 +11,7 @@ obj-                          :=
 
 # Objects we always build independent of SoC choice
 
-obj-y                          += init.o
+obj-y                          += init.o cpu.o
 obj-$(CONFIG_ARCH_USES_GETTIMEOFFSET)   += time.o
 obj-y                          += clock.o
 obj-y                          += pwm-clock.o

diff --git a/arch/arm/plat-samsung/cpu.c b/arch/arm/plat-samsung/cpu.c
new file mode 100644 (file)
index 0000000..81c06d4
--- /dev/null
+++ b/arch/arm/plat-samsung/cpu.c
@@ -0,0 +1,58 @@
+/* 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 <asm/system.h>
+
+#include <mach/map.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 s3c24xx_init_cpu(void)
+{
+       /* nothing here yet */
+
+       samsung_cpu_rev = 0;
+}
+
+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;
+}
+
+void __init s5p_init_cpu(void __iomem *cpuid_addr)
+{
+       samsung_cpu_id = __raw_readl(cpuid_addr);
+       samsung_cpu_rev = samsung_cpu_id & 0xFF;
+}

diff --git a/arch/arm/plat-samsung/include/plat/cpu.h b/arch/arm/plat-samsung/include/plat/cpu.h
index bdf43ad..c22d110 100644 (file)
--- a/arch/arm/plat-samsung/include/plat/cpu.h
+++ b/arch/arm/plat-samsung/include/plat/cpu.h
@@ -140,6 +140,10 @@ extern void s3c64xx_init_io(struct map_desc *mach_desc, int size);
 extern void s5p_init_io(struct map_desc *mach_desc,
                        int size, void __iomem *cpuid_addr);
 
+extern void s3c24xx_init_cpu(void);
+extern void s3c64xx_init_cpu(void);
+extern void s5p_init_cpu(void __iomem *cpuid_addr);
+
 extern void s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no);
 
 extern void s3c24xx_init_clocks(int xtal);

diff --git a/arch/arm/plat-samsung/init.c b/arch/arm/plat-samsung/init.c
index 40b1228..79d10fc 100644 (file)
--- a/arch/arm/plat-samsung/init.c
+++ b/arch/arm/plat-samsung/init.c
@@ -30,7 +30,6 @@
 #include <plat/regs-serial.h>
 
 static struct cpu_table *cpu;
-unsigned long samsung_cpu_id;
 
 static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode,
                                                struct cpu_table *tab,