[ARM] nommu: add ARM9TDMI core support

This patch adds ARM9TDMI core support which has no cache and no CP15
register(no memory control unit).

Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

6 files changed, 159 insertions, 1 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 8ec4b46d2cbb..a29e64175f8f 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -58,6 +58,7 @@ tune-$(CONFIG_CPU_ARM710)	:=-mtune=arm710
 tune-$(CONFIG_CPU_ARM7TDMI)     :=-mtune=arm7tdmi
 tune-$(CONFIG_CPU_ARM720T)      :=-mtune=arm7tdmi
 tune-$(CONFIG_CPU_ARM740T)      :=-mtune=arm7tdmi
+tune-$(CONFIG_CPU_ARM9TDMI)     :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM920T)      :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM922T)      :=-mtune=arm9tdmi
 tune-$(CONFIG_CPU_ARM925T)      :=-mtune=arm9tdmi
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 87f9fece9606..ed9d32c2469e 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -90,6 +90,19 @@ config CPU_ARM740T
           Say Y if you want support for the ARM740T processor.
           Otherwise, say N.
 
+# ARM9TDMI
+config CPU_ARM9TDMI
+        bool "Support ARM9TDMI processor"
+        select CPU_32v4T
+        select CPU_ABRT_EV4T
+        select CPU_CACHE_V4
+        help
+          A 32-bit RISC microprocessor based on the ARM9 processor core
+          which has no memory control unit and cache.
+
+          Say Y if you want support for the ARM9TDMI processor.
+          Otherwise, say N.
+
 # ARM920T
 config CPU_ARM920T
         bool "Support ARM920T processor"
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index d10db822d3b8..053957eebe24 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_CPU_ARM710)	+= proc-arm6_7.o
 obj-$(CONFIG_CPU_ARM7TDMI)      += proc-arm7tdmi.o
 obj-$(CONFIG_CPU_ARM720T)       += proc-arm720.o
 obj-$(CONFIG_CPU_ARM740T)       += proc-arm740.o
+obj-$(CONFIG_CPU_ARM9TDMI)      += proc-arm9tdmi.o
 obj-$(CONFIG_CPU_ARM920T)       += proc-arm920.o
 obj-$(CONFIG_CPU_ARM922T)       += proc-arm922.o
 obj-$(CONFIG_CPU_ARM925T)       += proc-arm925.o
diff --git a/arch/arm/mm/proc-arm9tdmi.S b/arch/arm/mm/proc-arm9tdmi.S
new file mode 100644
index 000000000000..95c90f13caa8
--- /dev/null
+++ b/arch/arm/mm/proc-arm9tdmi.S
@@ -0,0 +1,134 @@
+/*
+ *  linux/arch/arm/mm/proc-arm9tdmi.S: utility functions for ARM9TDMI
+ *
+ *  Copyright (C) 2003-2006 Hyok S. Choi <hyok.choi@samsung.com>
+ *
+ * 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/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/pgtable.h>
+#include <asm/procinfo.h>
+#include <asm/ptrace.h>
+
+        .text
+/*
+ * cpu_arm9tdmi_proc_init()
+ * cpu_arm9tdmi_do_idle()
+ * cpu_arm9tdmi_dcache_clean_area()
+ * cpu_arm9tdmi_switch_mm()
+ *
+ * These are not required.
+ */
+ENTRY(cpu_arm9tdmi_proc_init)
+ENTRY(cpu_arm9tdmi_do_idle)
+ENTRY(cpu_arm9tdmi_dcache_clean_area)
+ENTRY(cpu_arm9tdmi_switch_mm)
+                mov     pc, lr
+
+/*
+ * cpu_arm9tdmi_proc_fin()
+ */
+ENTRY(cpu_arm9tdmi_proc_fin)
+                mov     r0, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+                msr     cpsr_c, r0
+                mov     pc, lr
+
+/*
+ * Function: cpu_arm9tdmi_reset(loc)
+ * Params  : loc(r0)    address to jump to
+ * Purpose : Sets up everything for a reset and jump to the location for soft reset.
+ */
+ENTRY(cpu_arm9tdmi_reset)
+                mov     pc, r0
+
+                __INIT
+
+                .type   __arm9tdmi_setup, #function
+__arm9tdmi_setup:
+                mov     pc, lr
+                .size   __arm9tdmi_setup, . - __arm9tdmi_setup
+
+                __INITDATA
+
+/*
+ * Purpose : Function pointers used to access above functions - all calls
+ *           come through these
+ */
+                .type   arm9tdmi_processor_functions, #object
+ENTRY(arm9tdmi_processor_functions)
+                .word   v4t_early_abort
+                .word   cpu_arm9tdmi_proc_init
+                .word   cpu_arm9tdmi_proc_fin
+                .word   cpu_arm9tdmi_reset
+                .word   cpu_arm9tdmi_do_idle
+                .word   cpu_arm9tdmi_dcache_clean_area
+                .word   cpu_arm9tdmi_switch_mm
+                .word   0               @ cpu_*_set_pte
+                .size   arm9tdmi_processor_functions, . - arm9tdmi_processor_functions
+
+                .section ".rodata"
+
+                .type   cpu_arch_name, #object
+cpu_arch_name:
+                .asciz  "armv4t"
+                .size   cpu_arch_name, . - cpu_arch_name
+
+                .type   cpu_elf_name, #object
+cpu_elf_name:
+                .asciz  "v4"
+                .size   cpu_elf_name, . - cpu_elf_name
+
+                .type   cpu_arm9tdmi_name, #object
+cpu_arm9tdmi_name:
+                .asciz  "ARM9TDMI"
+                .size   cpu_arm9tdmi_name, . - cpu_arm9tdmi_name
+
+                .type   cpu_p2001_name, #object
+cpu_p2001_name:
+                .asciz  "P2001"
+                .size   cpu_p2001_name, . - cpu_p2001_name
+
+                .align
+
+                .section ".proc.info.init", #alloc, #execinstr
+
+                .type   __arm9tdmi_proc_info, #object
+__arm9tdmi_proc_info:
+                .long   0x41009900
+                .long   0xfff8ff00
+                .long   0
+                .long   0
+                b       __arm9tdmi_setup
+                .long   cpu_arch_name
+                .long   cpu_elf_name
+                .long   HWCAP_SWP | HWCAP_THUMB | HWCAP_26BIT
+                .long   cpu_arm9tdmi_name
+                .long   arm9tdmi_processor_functions
+                .long   0
+                .long   0
+                .long   v4_cache_fns
+                .size   __arm9tdmi_proc_info, . - __arm9dmi_proc_info
+
+                .type   __p2001_proc_info, #object
+__p2001_proc_info:
+                .long   0x41029000
+                .long   0xffffffff
+                .long   0
+                .long   0
+                b       __arm9tdmi_setup
+                .long   cpu_arch_name
+                .long   cpu_elf_name
+                .long   HWCAP_SWP | HWCAP_THUMB | HWCAP_26BIT
+                .long   cpu_p2001_name
+                .long   arm9tdmi_processor_functions
+                .long   0
+                .long   0
+                .long   v4_cache_fns
+                .size   __p2001_proc_info, . - __p2001_proc_info
diff --git a/include/asm-arm/cacheflush.h b/include/asm-arm/cacheflush.h
index 24924e64f883..77ff6fe86dbd 100644
--- a/include/asm-arm/cacheflush.h
+++ b/include/asm-arm/cacheflush.h
@@ -34,7 +34,8 @@
 # endif
 #endif
 
-#if defined(CONFIG_CPU_ARM720T) || defined(CONFIG_CPU_ARM7TDMI)
+#if defined(CONFIG_CPU_ARM720T) || defined(CONFIG_CPU_ARM7TDMI) || \
+    defined(CONFIG_CPU_ARM9TDMI)
 # ifdef _CACHE
 #  define MULTI_CACHE 1
 # else
diff --git a/include/asm-arm/proc-fns.h b/include/asm-arm/proc-fns.h
index 17dfc0de9658..7bb9dab310f5 100644
--- a/include/asm-arm/proc-fns.h
+++ b/include/asm-arm/proc-fns.h
@@ -65,6 +65,14 @@
 #   define CPU_NAME cpu_arm740
 #  endif
 # endif
+# ifdef CONFIG_CPU_ARM9TDMI
+#  ifdef CPU_NAME
+#   undef  MULTI_CPU
+#   define MULTI_CPU
+#  else
+#   define CPU_NAME cpu_arm9tdmi
+#  endif
+# endif
 # ifdef CONFIG_CPU_ARM920T
 #  ifdef CPU_NAME
 #   undef  MULTI_CPU