[net-next-2.6.git] / arch / arm / mm / proc-arm940.S

/*
 *  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/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#include "proc-macros.S"

/* 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_area(void *addr, size_t size)
 *
 *	Ensure no D cache aliasing occurs, either with itself or
 *	the I cache
 *
 *	- addr	- kernel address
 *	- size	- region size
 */
ENTRY(arm940_flush_kern_dcache_area)
	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, c6, 2		@ invalidate 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_area
	.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	nommu_early_abort
	.word	legacy_pabort
	.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
Commit	Line	Data
d60674eb HC	1	/*
	2	* linux/arch/arm/mm/arm940.S: utility functions for ARM940T
	3	*
	4	* Copyright (C) 2004-2006 Hyok S. Choi (hyok.choi@samsung.com)
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11	#include <linux/linkage.h>
	12	#include <linux/init.h>
	13	#include <asm/assembler.h>
5ec9407d	14	#include <asm/hwcap.h>
d60674eb HC	15	#include <asm/pgtable-hwdef.h>
d60674eb HC	16	#include <asm/pgtable.h>
d60674eb	17	#include <asm/ptrace.h>
8a5544c8	18	#include "proc-macros.S"
d60674eb HC	19
	20	/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
	21	#define CACHE_DLINESIZE 16
	22	#define CACHE_DSEGMENTS 4
	23	#define CACHE_DENTRIES 64
	24
	25	.text
	26	/*
	27	* cpu_arm940_proc_init()
	28	* cpu_arm940_switch_mm()
	29	*
	30	* These are not required.
	31	*/
	32	ENTRY(cpu_arm940_proc_init)
	33	ENTRY(cpu_arm940_switch_mm)
	34	mov pc, lr
	35
	36	/*
	37	* cpu_arm940_proc_fin()
	38	*/
	39	ENTRY(cpu_arm940_proc_fin)
	40	stmfd sp!, {lr}
	41	mov ip, #PSR_F_BIT \| PSR_I_BIT \| SVC_MODE
	42	msr cpsr_c, ip
	43	bl arm940_flush_kern_cache_all
	44	mrc p15, 0, r0, c1, c0, 0 @ ctrl register
	45	bic r0, r0, #0x00001000 @ i-cache
	46	bic r0, r0, #0x00000004 @ d-cache
	47	mcr p15, 0, r0, c1, c0, 0 @ disable caches
	48	ldmfd sp!, {pc}
	49
	50	/*
	51	* cpu_arm940_reset(loc)
	52	* Params : r0 = address to jump to
	53	* Notes : This sets up everything for a reset
	54	*/
	55	ENTRY(cpu_arm940_reset)
	56	mov ip, #0
	57	mcr p15, 0, ip, c7, c5, 0 @ flush I cache
	58	mcr p15, 0, ip, c7, c6, 0 @ flush D cache
	59	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	60	mrc p15, 0, ip, c1, c0, 0 @ ctrl register
	61	bic ip, ip, #0x00000005 @ .............c.p
	62	bic ip, ip, #0x00001000 @ i-cache
	63	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	64	mov pc, r0
	65
	66	/*
	67	* cpu_arm940_do_idle()
	68	*/
	69	.align 5
	70	ENTRY(cpu_arm940_do_idle)
	71	mcr p15, 0, r0, c7, c0, 4 @ Wait for interrupt
	72	mov pc, lr
	73
	74	/*
	75	* flush_user_cache_all()
	76	*/
	77	ENTRY(arm940_flush_user_cache_all)
	78	/* FALLTHROUGH */
	79
	80	/*
	81	* flush_kern_cache_all()
	82	*
83	* Clean and invalidate the entire cache.
84	*/
85	ENTRY(arm940_flush_kern_cache_all)
86	mov r2, #VM_EXEC
87	/* FALLTHROUGH */
88
89	/*
90	* flush_user_cache_range(start, end, flags)
91	*
92	* There is no efficient way to flush a range of cache entries
93	* in the specified address range. Thus, flushes all.
94	*
95	* - start - start address (inclusive)
96	* - end - end address (exclusive)
97	* - flags - vm_flags describing address space
98	*/
99	ENTRY(arm940_flush_user_cache_range)
100	mov ip, #0
101	#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
102	mcr p15, 0, ip, c7, c6, 0 @ flush D cache
103	#else
104	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
105	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
106	2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
107	subs r3, r3, #1 << 26
108	bcs 2b @ entries 63 to 0
109	subs r1, r1, #1 << 4
110	bcs 1b @ segments 3 to 0
111	#endif
112	tst r2, #VM_EXEC
113	mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
114	mcrne p15, 0, ip, c7, c10, 4 @ drain WB
115	mov pc, lr
116
117	/*
118	* coherent_kern_range(start, end)
119	*
120	* Ensure coherency between the Icache and the Dcache in the
121	* region described by start, end. If you have non-snooping
122	* Harvard caches, you need to implement this function.
123	*
124	* - start - virtual start address
125	* - end - virtual end address
126	*/
127	ENTRY(arm940_coherent_kern_range)
128	/* FALLTHROUGH */
129
130	/*
131	* coherent_user_range(start, end)
132	*
133	* Ensure coherency between the Icache and the Dcache in the
134	* region described by start, end. If you have non-snooping
135	* Harvard caches, you need to implement this function.
136	*
137	* - start - virtual start address
138	* - end - virtual end address
139	*/
140	ENTRY(arm940_coherent_user_range)
141	/* FALLTHROUGH */
142
143	/*
2c9b9c84	144	* flush_kern_dcache_area(void *addr, size_t size)
d60674eb HC	145	*
	146	* Ensure no D cache aliasing occurs, either with itself or
	147	* the I cache
	148	*
2c9b9c84 RK	149	* - addr - kernel address
2c9b9c84 RK	150	* - size - region size
d60674eb	151	*/
2c9b9c84	152	ENTRY(arm940_flush_kern_dcache_area)
d60674eb HC	153	mov ip, #0
	154	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	155	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	156	2: mcr p15, 0, r3, c7, c14, 2 @ clean/flush D index
	157	subs r3, r3, #1 << 26
	158	bcs 2b @ entries 63 to 0
	159	subs r1, r1, #1 << 4
	160	bcs 1b @ segments 7 to 0
	161	mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
	162	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	163	mov pc, lr
	164
	165	/*
	166	* dma_inv_range(start, end)
	167	*
	168	* There is no efficient way to invalidate a specifid virtual
	169	* address range. Thus, invalidates all.
	170	*
	171	* - start - virtual start address
	172	* - end - virtual end address
	173	*/
	174	ENTRY(arm940_dma_inv_range)
	175	mov ip, #0
	176	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	177	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	178	2: mcr p15, 0, r3, c7, c6, 2 @ flush D entry
	179	subs r3, r3, #1 << 26
	180	bcs 2b @ entries 63 to 0
	181	subs r1, r1, #1 << 4
	182	bcs 1b @ segments 7 to 0
	183	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	184	mov pc, lr
	185
	186	/*
	187	* dma_clean_range(start, end)
	188	*
	189	* There is no efficient way to clean a specifid virtual
	190	* address range. Thus, cleans all.
	191	*
	192	* - start - virtual start address
	193	* - end - virtual end address
	194	*/
	195	ENTRY(arm940_dma_clean_range)
	196	ENTRY(cpu_arm940_dcache_clean_area)
	197	mov ip, #0
	198	#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
	199	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
	200	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
	201	2: mcr p15, 0, r3, c7, c10, 2 @ clean D entry
	202	subs r3, r3, #1 << 26
	203	bcs 2b @ entries 63 to 0
	204	subs r1, r1, #1 << 4
	205	bcs 1b @ segments 7 to 0
	206	#endif
	207	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	208	mov pc, lr
	209
	210	/*
	211	* dma_flush_range(start, end)
	212	*
	213	* There is no efficient way to clean and invalidate a specifid
	214	* virtual address range.
	215	*
	216	* - start - virtual start address
217	* - end - virtual end address
218	*/
219	ENTRY(arm940_dma_flush_range)
220	mov ip, #0
221	mov r1, #(CACHE_DSEGMENTS - 1) << 4 @ 4 segments
222	1: orr r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
223	2:
224	#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
225	mcr p15, 0, r3, c7, c14, 2 @ clean/flush D entry
226	#else
b3a8b751	227	mcr p15, 0, r3, c7, c6, 2 @ invalidate D entry
d60674eb HC	228	#endif
	229	subs r3, r3, #1 << 26
	230	bcs 2b @ entries 63 to 0
	231	subs r1, r1, #1 << 4
	232	bcs 1b @ segments 7 to 0
	233	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	234	mov pc, lr
	235
	236	ENTRY(arm940_cache_fns)
	237	.long arm940_flush_kern_cache_all
	238	.long arm940_flush_user_cache_all
	239	.long arm940_flush_user_cache_range
	240	.long arm940_coherent_kern_range
	241	.long arm940_coherent_user_range
2c9b9c84	242	.long arm940_flush_kern_dcache_area
d60674eb HC	243	.long arm940_dma_inv_range
	244	.long arm940_dma_clean_range
	245	.long arm940_dma_flush_range
	246
	247	__INIT
	248
	249	.type __arm940_setup, #function
	250	__arm940_setup:
	251	mov r0, #0
	252	mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache
	253	mcr p15, 0, r0, c7, c6, 0 @ invalidate D cache
	254	mcr p15, 0, r0, c7, c10, 4 @ drain WB
	255
	256	mcr p15, 0, r0, c6, c3, 0 @ disable data area 3~7
	257	mcr p15, 0, r0, c6, c4, 0
	258	mcr p15, 0, r0, c6, c5, 0
	259	mcr p15, 0, r0, c6, c6, 0
	260	mcr p15, 0, r0, c6, c7, 0
	261
	262	mcr p15, 0, r0, c6, c3, 1 @ disable instruction area 3~7
	263	mcr p15, 0, r0, c6, c4, 1
	264	mcr p15, 0, r0, c6, c5, 1
	265	mcr p15, 0, r0, c6, c6, 1
	266	mcr p15, 0, r0, c6, c7, 1
	267
	268	mov r0, #0x0000003F @ base = 0, size = 4GB
	269	mcr p15, 0, r0, c6, c0, 0 @ set area 0, default
	270	mcr p15, 0, r0, c6, c0, 1
	271
	272	ldr r0, =(CONFIG_DRAM_BASE & 0xFFFFF000) @ base[31:12] of RAM
	273	ldr r1, =(CONFIG_DRAM_SIZE >> 12) @ size of RAM (must be >= 4KB)
	274	mov r2, #10 @ 11 is the minimum (4KB)
	275	1: add r2, r2, #1 @ area size *= 2
	276	mov r1, r1, lsr #1
	277	bne 1b @ count not zero r-shift
	278	orr r0, r0, r2, lsl #1 @ the area register value
	279	orr r0, r0, #1 @ set enable bit
	280	mcr p15, 0, r0, c6, c1, 0 @ set area 1, RAM
	281	mcr p15, 0, r0, c6, c1, 1
	282
	283	ldr r0, =(CONFIG_FLASH_MEM_BASE & 0xFFFFF000) @ base[31:12] of FLASH
	284	ldr r1, =(CONFIG_FLASH_SIZE >> 12) @ size of FLASH (must be >= 4KB)
	285	mov r2, #10 @ 11 is the minimum (4KB)
	286	1: add r2, r2, #1 @ area size *= 2
	287	mov r1, r1, lsr #1
	288	bne 1b @ count not zero r-shift
	289	orr r0, r0, r2, lsl #1 @ the area register value
	290	orr r0, r0, #1 @ set enable bit
	291	mcr p15, 0, r0, c6, c2, 0 @ set area 2, ROM/FLASH
	292	mcr p15, 0, r0, c6, c2, 1
	293
	294	mov r0, #0x06
	295	mcr p15, 0, r0, c2, c0, 0 @ Region 1&2 cacheable
	296	mcr p15, 0, r0, c2, c0, 1
	297	#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
	298	mov r0, #0x00 @ disable whole write buffer
	299	#else
	300	mov r0, #0x02 @ Region 1 write bufferred
	301	#endif
	302	mcr p15, 0, r0, c3, c0, 0
	303
	304	mov r0, #0x10000
	305	sub r0, r0, #1 @ r0 = 0xffff
	306	mcr p15, 0, r0, c5, c0, 0 @ all read/write access
307	mcr p15, 0, r0, c5, c0, 1
308
309	mrc p15, 0, r0, c1, c0 @ get control register
310	orr r0, r0, #0x00001000 @ I-cache
311	orr r0, r0, #0x00000005 @ MPU/D-cache
312
313	mov pc, lr
314
315	.size __arm940_setup, . - __arm940_setup
316
317	__INITDATA
318
319	/*
320	* Purpose : Function pointers used to access above functions - all calls
321	* come through these
322	*/
323	.type arm940_processor_functions, #object
324	ENTRY(arm940_processor_functions)
0f45d7f3	325	.word nommu_early_abort
4fb28474	326	.word legacy_pabort
d60674eb HC	327	.word cpu_arm940_proc_init
	328	.word cpu_arm940_proc_fin
	329	.word cpu_arm940_reset
	330	.word cpu_arm940_do_idle
	331	.word cpu_arm940_dcache_clean_area
	332	.word cpu_arm940_switch_mm
	333	.word 0 @ cpu_*_set_pte
	334	.size arm940_processor_functions, . - arm940_processor_functions
	335
	336	.section ".rodata"
	337
	338	.type cpu_arch_name, #object
	339	cpu_arch_name:
	340	.asciz "armv4t"
	341	.size cpu_arch_name, . - cpu_arch_name
	342
	343	.type cpu_elf_name, #object
	344	cpu_elf_name:
	345	.asciz "v4"
	346	.size cpu_elf_name, . - cpu_elf_name
	347
	348	.type cpu_arm940_name, #object
	349	cpu_arm940_name:
	350	.ascii "ARM940T"
	351	.size cpu_arm940_name, . - cpu_arm940_name
	352
	353	.align
	354
	355	.section ".proc.info.init", #alloc, #execinstr
	356
	357	.type __arm940_proc_info,#object
	358	__arm940_proc_info:
	359	.long 0x41009400
	360	.long 0xff00fff0
	361	.long 0
	362	b __arm940_setup
	363	.long cpu_arch_name
	364	.long cpu_elf_name
	365	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_THUMB
	366	.long cpu_arm940_name
	367	.long arm940_processor_functions
	368	.long 0
	369	.long 0
	370	.long arm940_cache_fns
	371	.size __arm940_proc_info, . - __arm940_proc_info
	372