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m68k: init the MMU hardware for the 54xx ColdFire

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The 54xx ColdFire CPU family has an internal MMU. Up to now though we
have only supported running on them with the MMU disabled.

Add code to the 54xx ColdFire init sequence to initialize the bootmem
used by the usual MMU m68k code for paging init.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
This commit is contained in:
Greg Ungerer 2011-10-14 15:35:37 +10:00
parent feb1ee7595
commit 0079fe7502
1 changed files with 46 additions and 1 deletions
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47
arch/m68k/platform/coldfire/head.S
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@ -3,7 +3,7 @@
/*
* head.S -- common startup code for ColdFire CPUs.
*
* (C) Copyright 1999-2010, Greg Ungerer <gerg@snapgear.com>.
* (C) Copyright 1999-2011, Greg Ungerer <gerg@snapgear.com>.
*/
/*****************************************************************************/
@ -13,6 +13,7 @@
#include <asm/asm-offsets.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfmmu.h>
#include <asm/thread_info.h>
/*****************************************************************************/
@ -135,6 +136,14 @@ _init_sp:
__HEAD
#ifdef CONFIG_MMU
_start0:
jmp _start
.global kernel_pg_dir
.equ kernel_pg_dir,_start0
.equ .,_start0+0x1000
#endif
/*
* This is the codes first entry point. This is where it all
* begins...
@ -193,6 +202,26 @@ _start:
movec %d0,%CACR
nop
#ifdef CONFIG_MMU
/*
* Identity mapping for the kernel region.
*/
movel #(MMUBASE+1),%d0 /* enable MMUBAR registers */
movec %d0,%MMUBAR
movel #MMUOR_CA,%d0 /* clear TLB entries */
movel %d0,MMUOR
movel #0,%d0 /* set ASID to 0 */
movec %d0,%asid
movel #MMUCR_EN,%d0 /* Enable the identity map */
movel %d0,MMUCR
nop /* sync i-pipeline */
movel #_vstart,%a0 /* jump to "virtual" space */
jmp %a0@
_vstart:
#endif /* CONFIG_MMU */
#ifdef CONFIG_ROMFS_FS
/*
* Move ROM filesystem above bss :-)
@ -238,6 +267,22 @@ _clear_bss:
lea init_thread_union,%a0
lea THREAD_SIZE(%a0),%sp
#ifdef CONFIG_MMU
.global m68k_cputype
.global m68k_mmutype
.global m68k_fputype
.global m68k_machtype
movel #CPU_COLDFIRE,%d0
movel %d0,m68k_cputype /* Mark us as a ColdFire */
movel #MMU_COLDFIRE,%d0
movel %d0,m68k_mmutype
movel #FPU_COLDFIRE,%d0
movel %d0,m68k_fputype
movel #MACH_M54XX,%d0
movel %d0,m68k_machtype /* Mark us as a 54xx machine */
lea init_task,%a2 /* Set "current" init task */
#endif
/*
* Assember start up done, start code proper.
*/