[ARM] S3C64XX: Basic CPU detection and map initialisation

Initialise the basic physical to virtual mappings and
then detect the CPU that the system is being run on so
that the cpu code code can call the correct initialisation
code.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c64xx/cpu.c b/arch/arm/plat-s3c64xx/cpu.c
new file mode 100644
index 000000000000..dc7bf112ec05
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/cpu.c
@@ -0,0 +1,106 @@
+/* linux/arch/arm/plat-s3c64xx/cpu.c
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C64XX 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/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/serial_core.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <plat/regs-serial.h>
+
+#include <plat/cpu.h>
+#include <plat/devs.h>
+#include <plat/clock.h>
+
+#include <plat/s3c6400.h>
+#include <plat/s3c6410.h>
+
+/* table of supported CPUs */
+
+static const char name_s3c6400[] = "S3C6400";
+static const char name_s3c6410[] = "S3C6410";
+
+static struct cpu_table cpu_ids[] __initdata = {
+        {
+                .idcode         = 0x36400000,
+                .idmask         = 0xfffff000,
+                .map_io         = s3c6400_map_io,
+                .init_clocks    = s3c6400_init_clocks,
+                .init_uarts     = s3c6400_init_uarts,
+                .init           = s3c6400_init,
+                .name           = name_s3c6400,
+        }, {
+                .idcode         = 0x36410100,
+                .idmask         = 0xffffff00,
+                .map_io         = s3c6410_map_io,
+                .init_clocks    = s3c6410_init_clocks,
+                .init_uarts     = s3c6410_init_uarts,
+                .init           = s3c6410_init,
+                .name           = name_s3c6410,
+        },
+};
+
+/* minimal IO mapping */
+
+/* see notes on uart map in arch/arm/mach-s3c6400/include/mach/debug-macro.S */
+#define UART_OFFS (S3C_PA_UART & 0xfffff)
+
+static struct map_desc s3c_iodesc[] __initdata = {
+        {
+                .virtual        = S3C_VA_SYS,
+                .pfn            = __phys_to_pfn(S3C64XX_PA_SYSCON),
+                .length         = SZ_4K,
+                .type           = MT_DEVICE,
+        }, {
+                .virtual        = (unsigned long)(S3C_VA_UART + UART_OFFS),
+                .pfn            = __phys_to_pfn(S3C_PA_UART),
+                .length         = SZ_4K,
+                .type           = MT_DEVICE,
+        }, {
+                .virtual        = S3C_VA_VIC0,
+                .pfn            = __phys_to_pfn(S3C64XX_PA_VIC0),
+                .length         = SZ_16K,
+                .type           = MT_DEVICE,
+        }, {
+                .virtual        = S3C_VA_VIC1,
+                .pfn            = __phys_to_pfn(S3C64XX_PA_VIC1),
+                .length         = SZ_16K,
+                .type           = MT_DEVICE,
+        },
+};
+
+/* read cpu identification code */
+
+
+void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
+{
+        unsigned long idcode;
+
+        /* initialise the io descriptors we need for initialisation */
+        iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
+        iotable_init(mach_desc, size);
+
+        idcode = __raw_readl(S3C_VA_SYS + 0x118);
+        s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids));
+}