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Commit d60674eb authored by Hyok S. Choi's avatar Hyok S. Choi Committed by Russell King
Browse files

[ARM] nommu: add ARM940T core support 



This patch adds ARM940T core support which has 4KB D-cache, 4KB I-cache
and a MPU.

Signed-off-by: default avatarHyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 43f5f014

arch/arm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ 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_ARM940T)	:=-mtune=arm9tdmi

tune-$(CONFIG_CPU_ARM920T)	:=-mtune=arm9tdmi

tune-$(CONFIG_CPU_ARM922T)	:=-mtune=arm9tdmi

tune-$(CONFIG_CPU_ARM925T)	:=-mtune=arm9tdmi

arch/arm/mm/Kconfig

+18 −2
Original line number Diff line number Diff line
@@ -184,6 +184,22 @@ config CPU_ARM926T 
	  Say Y if you want support for the ARM926T processor.

	  Otherwise, say N.



# ARM940T

config CPU_ARM940T

	bool "Support ARM940T processor" if ARCH_INTEGRATOR

	select CPU_32v4T

	select CPU_ABRT_EV4T

	select CPU_CACHE_VIVT

	select CPU_CP15_MPU

	help

	  ARM940T is a member of the ARM9TDMI family of general-

	  purpose microprocessors with MPU and seperate 4KB

	  instruction and 4KB data cases, each with a 4-word line

	  length.



	  Say Y if you want support for the ARM940T processor.

	  Otherwise, say N.



# ARM1020 - needs validating

config CPU_ARM1020

	bool "Support ARM1020T (rev 0) processor"
@@ -464,7 +480,7 @@ comment "Processor Features" 


config ARM_THUMB

	bool "Support Thumb user binaries"

	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

	depends on CPU_ARM720T || CPU_ARM740T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM940T || 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
@@ -501,7 +517,7 @@ config CPU_DCACHE_DISABLE 


config CPU_DCACHE_WRITETHROUGH

	bool "Force write through D-cache"

	depends on (CPU_ARM740T || 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_ARM940T || 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

arch/arm/mm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ obj-$(CONFIG_CPU_ARM920T) += proc-arm920.o 
obj-$(CONFIG_CPU_ARM922T)	+= proc-arm922.o

obj-$(CONFIG_CPU_ARM925T)	+= proc-arm925.o

obj-$(CONFIG_CPU_ARM926T)	+= proc-arm926.o

obj-$(CONFIG_CPU_ARM940T)	+= proc-arm940.o

obj-$(CONFIG_CPU_ARM1020)	+= proc-arm1020.o

obj-$(CONFIG_CPU_ARM1020E)	+= proc-arm1020e.o

obj-$(CONFIG_CPU_ARM1022)	+= proc-arm1022.o

arch/arm/mm/proc-arm940.S

0 → 100644
+369 −0
Original line number Diff line number Diff line 
/*

 *  linux/arch/arm/mm/arm940.S: utility functions for ARM940T

 *

 *  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/pgtable-hwdef.h>

#include <asm/pgtable.h>

#include <asm/procinfo.h>

#include <asm/ptrace.h>



/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */

#define CACHE_DLINESIZE	16

#define CACHE_DSEGMENTS	4

#define CACHE_DENTRIES	64



	.text

/*

 * cpu_arm940_proc_init()

 * cpu_arm940_switch_mm()

 *

 * These are not required.

 */

ENTRY(cpu_arm940_proc_init)

ENTRY(cpu_arm940_switch_mm)

	mov	pc, lr



/*

 * cpu_arm940_proc_fin()

 */

ENTRY(cpu_arm940_proc_fin)

	stmfd	sp!, {lr}

	mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE

	msr	cpsr_c, ip

	bl	arm940_flush_kern_cache_all

	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register

	bic	r0, r0, #0x00001000		@ i-cache

	bic	r0, r0, #0x00000004		@ d-cache

	mcr	p15, 0, r0, c1, c0, 0		@ disable caches

	ldmfd	sp!, {pc}



/*

 * cpu_arm940_reset(loc)

 * Params  : r0 = address to jump to

 * Notes   : This sets up everything for a reset

 */

ENTRY(cpu_arm940_reset)

	mov	ip, #0

	mcr	p15, 0, ip, c7, c5, 0		@ flush I cache

	mcr	p15, 0, ip, c7, c6, 0		@ flush D cache

	mcr	p15, 0, ip, c7, c10, 4		@ drain WB

	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register

	bic	ip, ip, #0x00000005		@ .............c.p

	bic	ip, ip, #0x00001000		@ i-cache

	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register

	mov	pc, r0



/*

 * cpu_arm940_do_idle()

 */

	.align	5

ENTRY(cpu_arm940_do_idle)

	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt

	mov	pc, lr



/*

 *	flush_user_cache_all()

 */

ENTRY(arm940_flush_user_cache_all)

	/* FALLTHROUGH */



/*

 *	flush_kern_cache_all()

 *

 *	Clean and invalidate the entire cache.

 */

ENTRY(arm940_flush_kern_cache_all)

	mov	r2, #VM_EXEC

	/* FALLTHROUGH */



/*

 *	flush_user_cache_range(start, end, flags)

 *

 *	There is no efficient way to flush a range of cache entries

 *	in the specified address range. Thus, flushes all.

 *

 *	- start	- start address (inclusive)

 *	- end	- end address (exclusive)

 *	- flags	- vm_flags describing address space

 */

ENTRY(arm940_flush_user_cache_range)

	mov	ip, #0

#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH

	mcr	p15, 0, ip, c7, c6, 0		@ flush D cache

#else

	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments

1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries

2:	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D index

	subs	r3, r3, #1 << 26

	bcs	2b				@ entries 63 to 0

	subs	r1, r1, #1 << 4

	bcs	1b				@ segments 3 to 0

#endif

	tst	r2, #VM_EXEC

	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache

	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB

	mov	pc, lr



/*

 *	coherent_kern_range(start, end)

 *

 *	Ensure coherency between the Icache and the Dcache in the

 *	region described by start, end.  If you have non-snooping

 *	Harvard caches, you need to implement this function.

 *

 *	- start	- virtual start address

 *	- end	- virtual end address

 */

ENTRY(arm940_coherent_kern_range)

	/* FALLTHROUGH */



/*

 *	coherent_user_range(start, end)

 *

 *	Ensure coherency between the Icache and the Dcache in the

 *	region described by start, end.  If you have non-snooping

 *	Harvard caches, you need to implement this function.

 *

 *	- start	- virtual start address

 *	- end	- virtual end address

 */

ENTRY(arm940_coherent_user_range)

	/* FALLTHROUGH */



/*

 *	flush_kern_dcache_page(void *page)

 *

 *	Ensure no D cache aliasing occurs, either with itself or

 *	the I cache

 *

 *	- addr	- page aligned address

 */

ENTRY(arm940_flush_kern_dcache_page)

	mov	ip, #0

	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments

1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries

2:	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D index

	subs	r3, r3, #1 << 26

	bcs	2b				@ entries 63 to 0

	subs	r1, r1, #1 << 4

	bcs	1b				@ segments 7 to 0

	mcr	p15, 0, ip, c7, c5, 0		@ invalidate I cache

	mcr	p15, 0, ip, c7, c10, 4		@ drain WB

	mov	pc, lr



/*

 *	dma_inv_range(start, end)

 *

 *	There is no efficient way to invalidate a specifid virtual

 *	address range. Thus, invalidates all.

 *

 *	- start	- virtual start address

 *	- end	- virtual end address

 */

ENTRY(arm940_dma_inv_range)

	mov	ip, #0

	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments

1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries

2:	mcr	p15, 0, r3, c7, c6, 2		@ flush D entry

	subs	r3, r3, #1 << 26

	bcs	2b				@ entries 63 to 0

	subs	r1, r1, #1 << 4

	bcs	1b				@ segments 7 to 0

	mcr	p15, 0, ip, c7, c10, 4		@ drain WB

	mov	pc, lr



/*

 *	dma_clean_range(start, end)

 *

 *	There is no efficient way to clean a specifid virtual

 *	address range. Thus, cleans all.

 *

 *	- start	- virtual start address

 *	- end	- virtual end address

 */

ENTRY(arm940_dma_clean_range)

ENTRY(cpu_arm940_dcache_clean_area)

	mov	ip, #0

#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH

	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments

1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries

2:	mcr	p15, 0, r3, c7, c10, 2		@ clean D entry

	subs	r3, r3, #1 << 26

	bcs	2b				@ entries 63 to 0

	subs	r1, r1, #1 << 4

	bcs	1b				@ segments 7 to 0

#endif

	mcr	p15, 0, ip, c7, c10, 4		@ drain WB

	mov	pc, lr



/*

 *	dma_flush_range(start, end)

 *

 *	There is no efficient way to clean and invalidate a specifid

 *	virtual address range.

 *

 *	- start	- virtual start address

 *	- end	- virtual end address

 */

ENTRY(arm940_dma_flush_range)

	mov	ip, #0

	mov	r1, #(CACHE_DSEGMENTS - 1) << 4	@ 4 segments

1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries

2:

#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH

	mcr	p15, 0, r3, c7, c14, 2		@ clean/flush D entry

#else

	mcr	p15, 0, r3, c7, c10, 2		@ clean D entry

#endif

	subs	r3, r3, #1 << 26

	bcs	2b				@ entries 63 to 0

	subs	r1, r1, #1 << 4

	bcs	1b				@ segments 7 to 0

	mcr	p15, 0, ip, c7, c10, 4		@ drain WB

	mov	pc, lr



ENTRY(arm940_cache_fns)

	.long	arm940_flush_kern_cache_all

	.long	arm940_flush_user_cache_all

	.long	arm940_flush_user_cache_range

	.long	arm940_coherent_kern_range

	.long	arm940_coherent_user_range

	.long	arm940_flush_kern_dcache_page

	.long	arm940_dma_inv_range

	.long	arm940_dma_clean_range

	.long	arm940_dma_flush_range



	__INIT



	.type	__arm940_setup, #function

__arm940_setup:

	mov	r0, #0

	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache

	mcr	p15, 0, r0, c7, c6, 0		@ invalidate D cache

	mcr	p15, 0, r0, c7, c10, 4		@ drain WB



	mcr	p15, 0, r0, c6, c3, 0		@ disable data area 3~7

	mcr	p15, 0, r0, c6, c4, 0

	mcr	p15, 0, r0, c6, c5, 0

	mcr	p15, 0, r0, c6, c6, 0

	mcr	p15, 0, r0, c6, c7, 0



	mcr	p15, 0, r0, c6, c3, 1		@ disable instruction area 3~7

	mcr	p15, 0, r0, c6, c4, 1

	mcr	p15, 0, r0, c6, c5, 1

	mcr	p15, 0, r0, c6, c6, 1

	mcr	p15, 0, r0, c6, c7, 1



	mov	r0, #0x0000003F			@ base = 0, size = 4GB

	mcr	p15, 0, r0, c6,	c0, 0		@ set area 0, default

	mcr	p15, 0, r0, c6,	c0, 1



	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, 0		@ set area 1, RAM

	mcr	p15, 0, r0, c6,	c1, 1



	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, 0		@ set area 2, ROM/FLASH

	mcr	p15, 0, r0, c6,	c2, 1



	mov	r0, #0x06

	mcr	p15, 0, r0, c2, c0, 0		@ Region 1&2 cacheable

	mcr	p15, 0, r0, c2, c0, 1

#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, 0



	mov	r0, #0x10000

	sub	r0, r0, #1			@ r0 = 0xffff

	mcr	p15, 0, r0, c5, c0, 0		@ all read/write access

	mcr	p15, 0, r0, c5, c0, 1



	mrc	p15, 0, r0, c1, c0		@ get control register

	orr	r0, r0, #0x00001000		@ I-cache

	orr	r0, r0, #0x00000005		@ MPU/D-cache



	mov	pc, lr



	.size	__arm940_setup, . - __arm940_setup



	__INITDATA



/*

 * Purpose : Function pointers used to access above functions - all calls

 *	     come through these

 */

	.type	arm940_processor_functions, #object

ENTRY(arm940_processor_functions)

	.word	v4t_early_abort

	.word	cpu_arm940_proc_init

	.word	cpu_arm940_proc_fin

	.word	cpu_arm940_reset

	.word   cpu_arm940_do_idle

	.word	cpu_arm940_dcache_clean_area

	.word	cpu_arm940_switch_mm

	.word	0		@ cpu_*_set_pte

	.size	arm940_processor_functions, . - arm940_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_arm940_name, #object

cpu_arm940_name:

	.ascii	"ARM940T"

	.size	cpu_arm940_name, . - cpu_arm940_name



	.align



	.section ".proc.info.init", #alloc, #execinstr



	.type	__arm940_proc_info,#object

__arm940_proc_info:

	.long	0x41009400

	.long	0xff00fff0

	.long	0

	b	__arm940_setup

	.long	cpu_arch_name

	.long	cpu_elf_name

	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB

	.long	cpu_arm940_name

	.long	arm940_processor_functions

	.long	0

	.long	0

	.long	arm940_cache_fns

	.size	__arm940_proc_info, . - __arm940_proc_info

include/asm-arm/cacheflush.h

+8 −0
Original line number Diff line number Diff line
@@ -56,6 +56,14 @@ 
# endif

#endif



#if defined(CONFIG_CPU_ARM940T)

# ifdef _CACHE

#  define MULTI_CACHE 1

# else

#  define _CACHE arm940

# endif

#endif



#if defined(CONFIG_CPU_SA110) || defined(CONFIG_CPU_SA1100)

# ifdef _CACHE

#  define MULTI_CACHE 1