arch/arm/mm/proc-sa110.S - linux-mtk - Git at Google

 /*
  *  linux/arch/arm/mm/proc-sa110.S
  *
  *  Copyright (C) 1997-2002 Russell King
  *
  * 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.
  *
  *  MMU functions for SA110
  *
  *  These are the low level assembler for performing cache and TLB
  *  functions on the StrongARM-110.
  */
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/assembler.h>
 #include <asm/asm-offsets.h>
 #include <asm/procinfo.h>
 #include <asm/hardware.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
 #include <asm/ptrace.h>

 /*
  * the cache line size of the I and D cache
  */
 #define DCACHELINESIZE	32
 #define FLUSH_OFFSET	32768

 	.macro flush_110_dcache	rd, ra, re
 	ldr	\rd, =flush_base
 	ldr	\ra, [\rd]
 	eor	\ra, \ra, #FLUSH_OFFSET
 	str	\ra, [\rd]
 	add	\re, \ra, #16384		@ only necessary for 16k
 1001:	ldr	\rd, [\ra], #DCACHELINESIZE
 	teq	\re, \ra
 	bne	1001b
 	.endm

 	.data
 flush_base:
 	.long	FLUSH_BASE
 	.text

 /*
  * cpu_sa110_proc_init()
  */
 ENTRY(cpu_sa110_proc_init)
 	mov	r0, #0
 	mcr	p15, 0, r0, c15, c1, 2		@ Enable clock switching
 	mov	pc, lr

 /*
  * cpu_sa110_proc_fin()
  */
 ENTRY(cpu_sa110_proc_fin)
 	stmfd	sp!, {lr}
 	mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
 	msr	cpsr_c, ip
 	bl	v4wb_flush_kern_cache_all	@ clean caches
 1:	mov	r0, #0
 	mcr	p15, 0, r0, c15, c2, 2		@ Disable clock switching
 	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
 	bic	r0, r0, #0x1000			@ ...i............
 	bic	r0, r0, #0x000e			@ ............wca.
 	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
 	ldmfd	sp!, {pc}

 /*
  * cpu_sa110_reset(loc)
  *
  * Perform a soft reset of the system.  Put the CPU into the
  * same state as it would be if it had been reset, and branch
  * to what would be the reset vector.
  *
  * loc: location to jump to for soft reset
  */
 	.align	5
 ENTRY(cpu_sa110_reset)
 	mov	ip, #0
 	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches
 	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
 	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
 	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
 	bic	ip, ip, #0x000f			@ ............wcam
 	bic	ip, ip, #0x1100			@ ...i...s........
 	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
 	mov	pc, r0

 /*
  * cpu_sa110_do_idle(type)
  *
  * Cause the processor to idle
  *
  * type: call type:
  *   0 = slow idle
  *   1 = fast idle
  *   2 = switch to slow processor clock
  *   3 = switch to fast processor clock
  */
 	.align	5

 ENTRY(cpu_sa110_do_idle)
 	mcr	p15, 0, ip, c15, c2, 2		@ disable clock switching
 	ldr	r1, =UNCACHEABLE_ADDR		@ load from uncacheable loc
 	ldr	r1, [r1, #0]			@ force switch to MCLK
 	mov	r0, r0				@ safety
 	mov	r0, r0				@ safety
 	mov	r0, r0				@ safety
 	mcr	p15, 0, r0, c15, c8, 2		@ Wait for interrupt, cache aligned
 	mov	r0, r0				@ safety
 	mov	r0, r0				@ safety
 	mov	r0, r0				@ safety
 	mcr	p15, 0, r0, c15, c1, 2		@ enable clock switching
 	mov	pc, lr

 /* ================================= CACHE ================================ */

 /*
  * cpu_sa110_dcache_clean_area(addr,sz)
  *
  * Clean the specified entry of any caches such that the MMU
  * translation fetches will obtain correct data.
  *
  * addr: cache-unaligned virtual address
  */
 	.align	5
 ENTRY(cpu_sa110_dcache_clean_area)
 1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 	add	r0, r0, #DCACHELINESIZE
 	subs	r1, r1, #DCACHELINESIZE
 	bhi	1b
 	mov	pc, lr

 /* =============================== PageTable ============================== */

 /*
  * cpu_sa110_switch_mm(pgd)
  *
  * Set the translation base pointer to be as described by pgd.
  *
  * pgd: new page tables
  */
 	.align	5
 ENTRY(cpu_sa110_switch_mm)
 	flush_110_dcache	r3, ip, r1
 	mov	r1, #0
 	mcr	p15, 0, r1, c7, c5, 0		@ invalidate I cache
 	mcr	p15, 0, r1, c7, c10, 4		@ drain WB
 	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
 	mcr	p15, 0, r1, c8, c7, 0		@ invalidate I & D TLBs
 	mov	pc, lr

 /*
  * cpu_sa110_set_pte(ptep, pte)
  *
  * Set a PTE and flush it out
  */
 	.align	5
 ENTRY(cpu_sa110_set_pte)
 	str	r1, [r0], #-2048		@ linux version

 	eor	r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY

 	bic	r2, r1, #PTE_SMALL_AP_MASK
 	bic	r2, r2, #PTE_TYPE_MASK
 	orr	r2, r2, #PTE_TYPE_SMALL

 	tst	r1, #L_PTE_USER			@ User?
 	orrne	r2, r2, #PTE_SMALL_AP_URO_SRW

 	tst	r1, #L_PTE_WRITE | L_PTE_DIRTY	@ Write and Dirty?
 	orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW

 	tst	r1, #L_PTE_PRESENT | L_PTE_YOUNG	@ Present and Young?
 	movne	r2, #0

 	str	r2, [r0]			@ hardware version
 	mov	r0, r0
 	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
 	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
 	mov	pc, lr

 	__INIT

 	.type	__sa110_setup, #function
 __sa110_setup:
 	mov	r10, #0
 	mcr	p15, 0, r10, c7, c7		@ invalidate I,D caches on v4
 	mcr	p15, 0, r10, c7, c10, 4		@ drain write buffer on v4
 	mcr	p15, 0, r10, c8, c7		@ invalidate I,D TLBs on v4
 	mrc	p15, 0, r0, c1, c0		@ get control register v4
 	ldr	r5, sa110_cr1_clear
 	bic	r0, r0, r5
 	ldr	r5, sa110_cr1_set
 	orr	r0, r0, r5
 	mov	pc, lr
 	.size	__sa110_setup, . - __sa110_setup

 	/*
 	 *  R
 	 * .RVI ZFRS BLDP WCAM
 	 * ..01 0001 ..11 1101
 	 *
 	 */
 	.type	sa110_cr1_clear, #object
 	.type	sa110_cr1_set, #object
 sa110_cr1_clear:
 	.word	0x3f3f
 sa110_cr1_set:
 	.word	0x113d

 	__INITDATA

 /*
  * Purpose : Function pointers used to access above functions - all calls
  *	     come through these
  */

 	.type	sa110_processor_functions, #object
 ENTRY(sa110_processor_functions)
 	.word	v4_early_abort
 	.word	cpu_sa110_proc_init
 	.word	cpu_sa110_proc_fin
 	.word	cpu_sa110_reset
 	.word	cpu_sa110_do_idle
 	.word	cpu_sa110_dcache_clean_area
 	.word	cpu_sa110_switch_mm
 	.word	cpu_sa110_set_pte
 	.size	sa110_processor_functions, . - sa110_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_sa110_name, #object
 cpu_sa110_name:
 	.asciz	"StrongARM-110"
 	.size	cpu_sa110_name, . - cpu_sa110_name

 	.align

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

 	.type	__sa110_proc_info,#object
 __sa110_proc_info:
 	.long	0x4401a100
 	.long	0xfffffff0
 	.long   PMD_TYPE_SECT | \
 		PMD_SECT_BUFFERABLE | \
 		PMD_SECT_CACHEABLE | \
 		PMD_SECT_AP_WRITE | \
 		PMD_SECT_AP_READ
 	b	__sa110_setup
 	.long	cpu_arch_name
 	.long	cpu_elf_name
 	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_26BIT | HWCAP_FAST_MULT
 	.long	cpu_sa110_name
 	.long	sa110_processor_functions
 	.long	v4wb_tlb_fns
 	.long	v4wb_user_fns
 	.long	v4wb_cache_fns
 	.size	__sa110_proc_info, . - __sa110_proc_info
	/*
	* linux/arch/arm/mm/proc-sa110.S
	*
	* Copyright (C) 1997-2002 Russell King
	*
	* 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.
	*
	* MMU functions for SA110
	*
	* These are the low level assembler for performing cache and TLB
	* functions on the StrongARM-110.
	*/
	#include <linux/linkage.h>
	#include <linux/init.h>
	#include <asm/assembler.h>
	#include <asm/asm-offsets.h>
	#include <asm/procinfo.h>
	#include <asm/hardware.h>
	#include <asm/pgtable-hwdef.h>
	#include <asm/pgtable.h>
	#include <asm/ptrace.h>

	/*
	* the cache line size of the I and D cache
	*/
	#define DCACHELINESIZE 32
	#define FLUSH_OFFSET 32768

	.macro flush_110_dcache rd, ra, re
	ldr \rd, =flush_base
	ldr \ra, [\rd]
	eor \ra, \ra, #FLUSH_OFFSET
	str \ra, [\rd]
	add \re, \ra, #16384 @ only necessary for 16k
	1001: ldr \rd, [\ra], #DCACHELINESIZE
	teq \re, \ra
	bne 1001b
	.endm

	.data
	flush_base:
	.long FLUSH_BASE
	.text

	/*
	* cpu_sa110_proc_init()
	*/
	ENTRY(cpu_sa110_proc_init)
	mov r0, #0
	mcr p15, 0, r0, c15, c1, 2 @ Enable clock switching
	mov pc, lr

	/*
	* cpu_sa110_proc_fin()
	*/
	ENTRY(cpu_sa110_proc_fin)
	stmfd sp!, {lr}
	mov ip, #PSR_F_BIT \| PSR_I_BIT \| SVC_MODE
	msr cpsr_c, ip
	bl v4wb_flush_kern_cache_all @ clean caches
	1: mov r0, #0
	mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
	mrc p15, 0, r0, c1, c0, 0 @ ctrl register
	bic r0, r0, #0x1000 @ ...i............
	bic r0, r0, #0x000e @ ............wca.
	mcr p15, 0, r0, c1, c0, 0 @ disable caches
	ldmfd sp!, {pc}

	/*
	* cpu_sa110_reset(loc)
	*
	* Perform a soft reset of the system. Put the CPU into the
	* same state as it would be if it had been reset, and branch
	* to what would be the reset vector.
	*
	* loc: location to jump to for soft reset
	*/
	.align 5
	ENTRY(cpu_sa110_reset)
	mov ip, #0
	mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches
	mcr p15, 0, ip, c7, c10, 4 @ drain WB
	mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
	mrc p15, 0, ip, c1, c0, 0 @ ctrl register
	bic ip, ip, #0x000f @ ............wcam
	bic ip, ip, #0x1100 @ ...i...s........
	mcr p15, 0, ip, c1, c0, 0 @ ctrl register
	mov pc, r0

	/*
	* cpu_sa110_do_idle(type)
	*
	* Cause the processor to idle
	*
	* type: call type:
	* 0 = slow idle
	* 1 = fast idle
	* 2 = switch to slow processor clock
	* 3 = switch to fast processor clock
	*/
	.align 5

	ENTRY(cpu_sa110_do_idle)
	mcr p15, 0, ip, c15, c2, 2 @ disable clock switching
	ldr r1, =UNCACHEABLE_ADDR @ load from uncacheable loc
	ldr r1, [r1, #0] @ force switch to MCLK
	mov r0, r0 @ safety
	mov r0, r0 @ safety
	mov r0, r0 @ safety
	mcr p15, 0, r0, c15, c8, 2 @ Wait for interrupt, cache aligned
	mov r0, r0 @ safety
	mov r0, r0 @ safety
	mov r0, r0 @ safety
	mcr p15, 0, r0, c15, c1, 2 @ enable clock switching
	mov pc, lr

	/* ================================= CACHE ================================ */

	/*
	* cpu_sa110_dcache_clean_area(addr,sz)
	*
	* Clean the specified entry of any caches such that the MMU
	* translation fetches will obtain correct data.
	*
	* addr: cache-unaligned virtual address
	*/
	.align 5
	ENTRY(cpu_sa110_dcache_clean_area)
	1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	add r0, r0, #DCACHELINESIZE
	subs r1, r1, #DCACHELINESIZE
	bhi 1b
	mov pc, lr

	/* =============================== PageTable ============================== */

	/*
	* cpu_sa110_switch_mm(pgd)
	*
	* Set the translation base pointer to be as described by pgd.
	*
	* pgd: new page tables
	*/
	.align 5
	ENTRY(cpu_sa110_switch_mm)
	flush_110_dcache r3, ip, r1
	mov r1, #0
	mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
	mcr p15, 0, r1, c7, c10, 4 @ drain WB
	mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
	mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
	mov pc, lr

	/*
	* cpu_sa110_set_pte(ptep, pte)
	*
	* Set a PTE and flush it out
	*/
	.align 5
	ENTRY(cpu_sa110_set_pte)
	str r1, [r0], #-2048 @ linux version

	eor r1, r1, #L_PTE_PRESENT \| L_PTE_YOUNG \| L_PTE_WRITE \| L_PTE_DIRTY

	bic r2, r1, #PTE_SMALL_AP_MASK
	bic r2, r2, #PTE_TYPE_MASK
	orr r2, r2, #PTE_TYPE_SMALL

	tst r1, #L_PTE_USER @ User?
	orrne r2, r2, #PTE_SMALL_AP_URO_SRW

	tst r1, #L_PTE_WRITE \| L_PTE_DIRTY @ Write and Dirty?
	orreq r2, r2, #PTE_SMALL_AP_UNO_SRW

	tst r1, #L_PTE_PRESENT \| L_PTE_YOUNG @ Present and Young?
	movne r2, #0

	str r2, [r0] @ hardware version
	mov r0, r0
	mcr p15, 0, r0, c7, c10, 1 @ clean D entry
	mcr p15, 0, r0, c7, c10, 4 @ drain WB
	mov pc, lr

	__INIT

	.type __sa110_setup, #function
	__sa110_setup:
	mov r10, #0
	mcr p15, 0, r10, c7, c7 @ invalidate I,D caches on v4
	mcr p15, 0, r10, c7, c10, 4 @ drain write buffer on v4
	mcr p15, 0, r10, c8, c7 @ invalidate I,D TLBs on v4
	mrc p15, 0, r0, c1, c0 @ get control register v4
	ldr r5, sa110_cr1_clear
	bic r0, r0, r5
	ldr r5, sa110_cr1_set
	orr r0, r0, r5
	mov pc, lr
	.size __sa110_setup, . - __sa110_setup

	/*
	* R
	* .RVI ZFRS BLDP WCAM
	* ..01 0001 ..11 1101
	*
	*/
	.type sa110_cr1_clear, #object
	.type sa110_cr1_set, #object
	sa110_cr1_clear:
	.word 0x3f3f
	sa110_cr1_set:
	.word 0x113d

	__INITDATA

	/*
	* Purpose : Function pointers used to access above functions - all calls
	* come through these
	*/

	.type sa110_processor_functions, #object
	ENTRY(sa110_processor_functions)
	.word v4_early_abort
	.word cpu_sa110_proc_init
	.word cpu_sa110_proc_fin
	.word cpu_sa110_reset
	.word cpu_sa110_do_idle
	.word cpu_sa110_dcache_clean_area
	.word cpu_sa110_switch_mm
	.word cpu_sa110_set_pte
	.size sa110_processor_functions, . - sa110_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_sa110_name, #object
	cpu_sa110_name:
	.asciz "StrongARM-110"
	.size cpu_sa110_name, . - cpu_sa110_name

	.align

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

	.type __sa110_proc_info,#object
	__sa110_proc_info:
	.long 0x4401a100
	.long 0xfffffff0
	.long PMD_TYPE_SECT \| \
	PMD_SECT_BUFFERABLE \| \
	PMD_SECT_CACHEABLE \| \
	PMD_SECT_AP_WRITE \| \
	PMD_SECT_AP_READ
	b __sa110_setup
	.long cpu_arch_name
	.long cpu_elf_name
	.long HWCAP_SWP \| HWCAP_HALF \| HWCAP_26BIT \| HWCAP_FAST_MULT
	.long cpu_sa110_name
	.long sa110_processor_functions
	.long v4wb_tlb_fns
	.long v4wb_user_fns
	.long v4wb_cache_fns
	.size __sa110_proc_info, . - __sa110_proc_info