[ARM] nommu: add ARM740T core support

This patch adds ARM740T core support which has a MPU and 4KB or 8KB cache.

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

4 files changed, 193 insertions, 2 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 282333fe0a74..8ec4b46d2cbb 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -57,6 +57,7 @@ tune-$(CONFIG_CPU_ARM610)	:=-mtune=arm610
 tune-$(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_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 9f860aa9c908..87f9fece9606 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -75,6 +75,21 @@ config CPU_ARM720T
           Say Y if you want support for the ARM720T processor.
           Otherwise, say N.
 
+# ARM740T
+config CPU_ARM740T
+        bool "Support ARM740T processor" if ARCH_INTEGRATOR
+        select CPU_32v4T
+        select CPU_ABRT_LV4T
+        select CPU_CACHE_V3     # although the core is v4t
+        select CPU_CP15_MPU
+        help
+          A 32-bit RISC processor with 8KB cache or 4KB variants,
+          write buffer and MPU(Protection Unit) built around
+          an ARM7TDMI core.
+
+          Say Y if you want support for the ARM740T processor.
+          Otherwise, say N.
+
 # ARM920T
 config CPU_ARM920T
         bool "Support ARM920T processor"
@@ -436,7 +451,7 @@ comment "Processor Features"
 
 config ARM_THUMB
         bool "Support Thumb user binaries"
-        depends on CPU_ARM720T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
+        depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
         default y
         help
           Say Y if you want to include kernel support for running user space
@@ -473,7 +488,7 @@ config CPU_DCACHE_DISABLE
 
 config CPU_DCACHE_WRITETHROUGH
         bool "Force write through D-cache"
-        depends on (CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
+        depends on (CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
         default y if CPU_ARM925T
         help
           Say Y here to use the data cache in writethrough mode. Unless you
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 908f6d437174..d10db822d3b8 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_CPU_ARM610)	+= proc-arm6_7.o
 obj-$(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_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-arm740.S b/arch/arm/mm/proc-arm740.S
new file mode 100644
index 000000000000..40713818a87b
--- /dev/null
+++ b/arch/arm/mm/proc-arm740.S
@@ -0,0 +1,174 @@
+/*
+ *  linux/arch/arm/mm/arm740.S: utility functions for ARM740
+ *
+ *  Copyright (C) 2004-2006 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_arm740_proc_init()
+ * cpu_arm740_do_idle()
+ * cpu_arm740_dcache_clean_area()
+ * cpu_arm740_switch_mm()
+ *
+ * These are not required.
+ */
+ENTRY(cpu_arm740_proc_init)
+ENTRY(cpu_arm740_do_idle)
+ENTRY(cpu_arm740_dcache_clean_area)
+ENTRY(cpu_arm740_switch_mm)
+        mov     pc, lr
+
+/*
+ * cpu_arm740_proc_fin()
+ */
+ENTRY(cpu_arm740_proc_fin)
+        stmfd   sp!, {lr}
+        mov     ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+        msr     cpsr_c, ip
+        mrc     p15, 0, r0, c1, c0, 0
+        bic     r0, r0, #0x3f000000             @ bank/f/lock/s
+        bic     r0, r0, #0x0000000c             @ w-buffer/cache
+        mcr     p15, 0, r0, c1, c0, 0           @ disable caches
+        mcr     p15, 0, r0, c7, c0, 0           @ invalidate cache
+        ldmfd   sp!, {pc}
+
+/*
+ * cpu_arm740_reset(loc)
+ * Params  : r0 = address to jump to
+ * Notes   : This sets up everything for a reset
+ */
+ENTRY(cpu_arm740_reset)
+        mov     ip, #0
+        mcr     p15, 0, ip, c7, c0, 0           @ invalidate cache
+        mrc     p15, 0, ip, c1, c0, 0           @ get ctrl register
+        bic     ip, ip, #0x0000000c             @ ............wc..
+        mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
+        mov     pc, r0
+
+        __INIT
+
+        .type   __arm740_setup, #function
+__arm740_setup:
+        mov     r0, #0
+        mcr     p15, 0, r0, c7, c0, 0           @ invalidate caches
+
+        mcr     p15, 0, r0, c6, c3              @ disable area 3~7
+        mcr     p15, 0, r0, c6, c4
+        mcr     p15, 0, r0, c6, c5
+        mcr     p15, 0, r0, c6, c6
+        mcr     p15, 0, r0, c6, c7
+
+        mov     r0, #0x0000003F                 @ base = 0, size = 4GB
+        mcr     p15, 0, r0, c6, c0              @ set area 0, default
+
+        ldr     r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
+        ldr     r1, =(CONFIG_DRAM_SIZE >> 12)   @ size of RAM (must be >= 4KB)
+        mov     r2, #10                         @ 11 is the minimum (4KB)
+1:      add     r2, r2, #1                      @ area size *= 2
+        mov     r1, r1, lsr #1
+        bne     1b                              @ count not zero r-shift
+        orr     r0, r0, r2, lsl #1              @ the area register value
+        orr     r0, r0, #1                      @ set enable bit
+        mcr     p15, 0, r0, c6, c1              @ set area 1, RAM
+
+        ldr     r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
+        ldr     r1, =(CONFIG_FLASH_SIZE >> 12)  @ size of FLASH (must be >= 4KB)
+        mov     r2, #10                         @ 11 is the minimum (4KB)
+1:      add     r2, r2, #1                      @ area size *= 2
+        mov     r1, r1, lsr #1
+        bne     1b                              @ count not zero r-shift
+        orr     r0, r0, r2, lsl #1              @ the area register value
+        orr     r0, r0, #1                      @ set enable bit
+        mcr     p15, 0, r0, c6, c2              @ set area 2, ROM/FLASH
+
+        mov     r0, #0x06
+        mcr     p15, 0, r0, c2, c0              @ Region 1&2 cacheable
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+        mov     r0, #0x00                       @ disable whole write buffer
+#else
+        mov     r0, #0x02                       @ Region 1 write bufferred
+#endif
+        mcr     p15, 0, r0, c3, c0
+
+        mov     r0, #0x10000
+        sub     r0, r0, #1                      @ r0 = 0xffff
+        mcr     p15, 0, r0, c5, c0              @ all read/write access
+
+        mrc     p15, 0, r0, c1, c0              @ get control register
+        bic     r0, r0, #0x3F000000             @ set to standard caching mode
+                                                @ need some benchmark
+        orr     r0, r0, #0x0000000d             @ MPU/Cache/WB
+
+        mov     pc, lr
+
+        .size   __arm740_setup, . - __arm740_setup
+
+        __INITDATA
+
+/*
+ * Purpose : Function pointers used to access above functions - all calls
+ *           come through these
+ */
+        .type   arm740_processor_functions, #object
+ENTRY(arm740_processor_functions)
+        .word   v4t_late_abort
+        .word   cpu_arm740_proc_init
+        .word   cpu_arm740_proc_fin
+        .word   cpu_arm740_reset
+        .word   cpu_arm740_do_idle
+        .word   cpu_arm740_dcache_clean_area
+        .word   cpu_arm740_switch_mm
+        .word   0                       @ cpu_*_set_pte
+        .size   arm740_processor_functions, . - arm740_processor_functions
+
+        .section ".rodata"
+
+        .type   cpu_arch_name, #object
+cpu_arch_name:
+        .asciz  "armv4"
+        .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_arm740_name, #object
+cpu_arm740_name:
+        .ascii  "ARM740T"
+        .size   cpu_arm740_name, . - cpu_arm740_name
+
+        .align
+
+        .section ".proc.info.init", #alloc, #execinstr
+        .type   __arm740_proc_info,#object
+__arm740_proc_info:
+        .long   0x41807400
+        .long   0xfffffff0
+        .long   0
+        b       __arm740_setup
+        .long   cpu_arch_name
+        .long   cpu_elf_name
+        .long   HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT
+        .long   cpu_arm740_name
+        .long   arm740_processor_functions
+        .long   0
+        .long   0
+        .long   v3_cache_fns                    @ cache model
+        .size   __arm740_proc_info, . - __arm740_proc_info
+
+