[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>

1 files changed, 174 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-arm740.S b/arch/arm/mm/proc-arm740.S
new file mode 100644
index 00000000000..40713818a87
--- /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
+
+