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Commit 0ef6c9b8 authored by Greg Ungerer's avatar Greg Ungerer
Browse files

m68knommu: support version 2 ColdFire split cache 



The newer version 2 ColdFire CPU cores support a configurable cache
arrangement. The cache memory can be used as all instruction cache, all
data cache, or split in half for both instruction and data caching.
Support this setup via a Kconfig time menu that allows a kernel builder
to choose the arrangement they want to use.

Signed-off-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent d475e3e4

arch/m68k/include/asm/m52xxacr.h

+16 −14
Original line number Diff line number Diff line
@@ -53,23 +53,25 @@ 
#define ACR_WPROTECT	0x00000004	/* Write protect region */



/*

 * Set the cache controller settings we will use. This code is set to

 * only use the instruction cache, even on the controllers that support

 * split cache. (This setup is trying to preserve the existing behavior

 * for now, in the furture I hope to actually use the split cache mode).

 * Set the cache controller settings we will use. On the cores that support

 * a split cache configuration we allow all the combinations at Kconfig

 * time. For those cores that only have an instruction cache we just set

 * that as on.

 */

#if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \

    defined(CONFIG_M5249) || defined(CONFIG_M5272)

#define CACHE_INIT	(CACR_CINV)

#define CACHE_MODE	(CACR_CENB + CACR_DCM)

#if defined(CONFIG_CACHE_I)

#define CACHE_TYPE	CACR_DISD

#elif defined(CONFIG_CACHE_D)

#define CACHE_TYPE	CACR_DISI

#else

#ifdef CONFIG_COLDFIRE_SW_A7

#define CACHE_INIT	(CACR_CINV + CACR_DISD)

#define CACHE_MODE	(CACR_CENB + CACR_DISD + CACR_DCM)

#else

#define CACHE_INIT	(CACR_CINV + CACR_DISD + CACR_EUSP)

#define CACHE_MODE	(CACR_CENB + CACR_DISD + CACR_DCM + CACR_EUSP)

#define CACHE_TYPE

#endif



#if defined(CONFIG_HAVE_CACHE_SPLIT)

#define CACHE_INIT	(CACR_CINV + CACHE_TYPE + CACR_EUSP)

#define CACHE_MODE	(CACR_CENB + CACHE_TYPE + CACR_DCM + CACR_EUSP)

#else

#define CACHE_INIT	(CACR_CINV)

#define CACHE_MODE	(CACR_CENB + CACR_DCM)

#endif



#define CACHE_INVALIDATE (CACHE_MODE + CACR_CINV)

arch/m68knommu/Kconfig

+32 −0
Original line number Diff line number Diff line
@@ -79,6 +79,9 @@ config COLDFIRE_SW_A7 
	bool

	default n



config HAVE_CACHE_SPLIT

	bool



source "init/Kconfig"



source "kernel/Kconfig.freezer"
@@ -124,12 +127,14 @@ config M5206e 
config M520x

	bool "MCF520x"

	select GENERIC_CLOCKEVENTS

	select HAVE_CACHE_SPLIT

	help

	   Freescale Coldfire 5207/5208 processor support.



config M523x

	bool "MCF523x"

	select GENERIC_CLOCKEVENTS

	select HAVE_CACHE_SPLIT

	help

	  Freescale Coldfire 5230/1/2/4/5 processor support
@@ -141,6 +146,7 @@ config M5249 


config M5271

	bool "MCF5271"

	select HAVE_CACHE_SPLIT

	help

	  Freescale (Motorola) ColdFire 5270/5271 processor support.
@@ -152,12 +158,14 @@ config M5272 


config M5275

	bool "MCF5275"

	select HAVE_CACHE_SPLIT

	help

	  Freescale (Motorola) ColdFire 5274/5275 processor support.



config M528x

	bool "MCF528x"

	select GENERIC_CLOCKEVENTS

	select HAVE_CACHE_SPLIT

	help

	  Motorola ColdFire 5280/5282 processor support.
@@ -250,6 +258,30 @@ config OLDMASK 
	  Build support for the older revision ColdFire 5307 silicon.

	  Specifically this is the 1H55J mask revision.



if HAVE_CACHE_SPLIT

choice

	prompt "Split Cache Configuration"

	default CACHE_I



config CACHE_I

	bool "Instruction"

	help

	  Use all of the ColdFire CPU cache memory as an instruction cache.



config CACHE_D

	bool "Data"

	help

	  Use all of the ColdFire CPU cache memory as a data cache.



config CACHE_BOTH

	bool "Both"

	help

	  Split the ColdFire CPU cache, and use half as an instruction cache

	  and half as a data cache.

endchoice



endif



comment "Platform"



config PILOT3