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Commit 4a5bae41 authored by Greg Ungerer's avatar Greg Ungerer
Browse files

m68knommu: support ColdFire caches that do copyback and write-through 



The version 3 and version 4 ColdFire cache controllers support both
write-through and copy-back modes on the data cache. Allow for Kconfig
time configuration of this, and set the cache mode appropriately.

Signed-off-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent 0ef6c9b8

arch/m68k/include/asm/m53xxacr.h

+7 −1
Original line number Diff line number Diff line
@@ -53,6 +53,12 @@ 
 * CACR is cache inhibited, we use the ACR register to set cacheing

 * enabled on the regions we want (eg RAM).

 */

#if defined(CONFIG_CACHE_COPYBACK)

#define CACHE_TYPE	ACR_CM_CB

#else

#define CACHE_TYPE	ACR_CM_WT

#endif



#ifdef CONFIG_COLDFIRE_SW_A7

#define CACHE_MODE	(CACR_EC + CACR_ESB + CACR_DCM_PRE)

#else
@@ -63,7 +69,7 @@ 


#define ACR0_MODE	((CONFIG_RAMBASE & 0xff000000) + \

			 (0x000f0000) + \

			 (ACR_ENABLE + ACR_ANY + ACR_CM_CB))

			 (ACR_ENABLE + ACR_ANY + CACHE_TYPE))

#define ACR1_MODE	0



/****************************************************************************/

arch/m68k/include/asm/m54xxacr.h

+4 −0
Original line number Diff line number Diff line
@@ -73,7 +73,11 @@ 
#else

#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC+CACR_EUSP)

#endif

#if defined(CONFIG_CACHE_COPYBACK)

#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_CP)

#else

#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)

#endif

#define INSN_CACHE_MODE (ACR_ENABLE+ACR_ANY)



#define CACHE_INIT	(CACR_DCINVA+CACR_BCINVA+CACR_ICINVA)

arch/m68knommu/Kconfig

+24 −0
Original line number Diff line number Diff line
@@ -82,6 +82,9 @@ config COLDFIRE_SW_A7 
config HAVE_CACHE_SPLIT

	bool



config HAVE_CACHE_CB

	bool



source "init/Kconfig"



source "kernel/Kconfig.freezer"
@@ -172,27 +175,32 @@ config M528x 
config M5307

	bool "MCF5307"

	select COLDFIRE_SW_A7

	select HAVE_CACHE_CB

	help

	  Motorola ColdFire 5307 processor support.



config M532x

	bool "MCF532x"

	select HAVE_CACHE_CB

	help

	  Freescale (Motorola) ColdFire 532x processor support.



config M5407

	bool "MCF5407"

	select COLDFIRE_SW_A7

	select HAVE_CACHE_CB

	help

	  Motorola ColdFire 5407 processor support.



config M547x

	bool "MCF547x"

	select HAVE_CACHE_CB

	help

	  Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.



config M548x

	bool "MCF548x"

	select HAVE_CACHE_CB

	help

	  Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
@@ -279,7 +287,23 @@ config CACHE_BOTH 
	  Split the ColdFire CPU cache, and use half as an instruction cache

	  and half as a data cache.

endchoice

endif



if HAVE_CACHE_CB

choice

	prompt "Data cache mode"

	default CACHE_WRITETHRU



config CACHE_WRITETHRU

	bool "Write-through"

	help

	  The ColdFire CPU cache is set into Write-through mode.



config CACHE_COPYBACK

	bool "Copy-back"

	help

	  The ColdFire CPU cache is set into Copy-back mode.

endchoice

endif



comment "Platform"