Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 35133692 authored by Chris Dearman's avatar Chris Dearman Committed by Ralf Baechle
Browse files

[MIPS] Allow setting of the cache attribute at run time. 



Slightly tacky, but there is a precedent in the sparc archirecture code.

Signed-off-by: default avatarChris Dearman <chris@mips.com>
Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent bec50527

arch/mips/Kconfig.debug

+0 −10
Original line number Diff line number Diff line
@@ -73,14 +73,4 @@ config RUNTIME_DEBUG 
	  include/asm-mips/debug.h for debuging macros.

	  If unsure, say N.



config MIPS_UNCACHED

	bool "Run uncached"

	depends on DEBUG_KERNEL && !SMP && !SGI_IP27

	help

	  If you say Y here there kernel will disable all CPU caches.  This will

	  reduce the system's performance dramatically but can help finding

	  otherwise hard to track bugs.  It can also useful if you're doing

	  hardware debugging with a logic analyzer and need to see all traffic

	  on the bus.



endmenu

arch/mips/configs/mipssim_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -641,7 +641,6 @@ CONFIG_CROSSCOMPILE=y 
CONFIG_CMDLINE="nfsroot=192.168.192.169:/u1/mipsel,timeo=20 ip=dhcp"

# CONFIG_DEBUG_STACK_USAGE is not set

# CONFIG_RUNTIME_DEBUG is not set

# CONFIG_MIPS_UNCACHED is not set



#

# Security options

arch/mips/configs/pnx8550-jbs_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -1223,7 +1223,6 @@ CONFIG_CMDLINE="console=ttyS1,38400n8 kgdb=ttyS0 root=/dev/nfs ip=bootp" 
# CONFIG_KGDB is not set

CONFIG_SYS_SUPPORTS_KGDB=y

# CONFIG_RUNTIME_DEBUG is not set

# CONFIG_MIPS_UNCACHED is not set



#

# Security options

arch/mips/configs/pnx8550-stb810_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -1213,7 +1213,6 @@ CONFIG_CMDLINE="console=ttyS1,38400n8 kgdb=ttyS0 root=/dev/nfs ip=bootp" 
# CONFIG_KGDB is not set

CONFIG_SYS_SUPPORTS_KGDB=y

# CONFIG_RUNTIME_DEBUG is not set

# CONFIG_MIPS_UNCACHED is not set



#

# Security options

arch/mips/mm/c-r4k.c

+18 −1
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/linkage.h>

#include <linux/sched.h>

#include <linux/mm.h>

#include <linux/module.h>

#include <linux/bitops.h>



#include <asm/bcache.h>
@@ -1216,9 +1217,25 @@ void au1x00_fixup_config_od(void) 
	}

}



static int __cpuinitdata cca = -1;



static int __init cca_setup(char *str)

{

	get_option(&str, &cca);



	return 1;

}



__setup("cca=", cca_setup);



static void __cpuinit coherency_setup(void)

{

	change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);

	if (cca < 0 || cca > 7)

		cca = read_c0_config() & CONF_CM_CMASK;

	_page_cachable_default = cca << _CACHE_SHIFT;



	pr_debug("Using cache attribute %d\n", cca);

	change_c0_config(CONF_CM_CMASK, cca);



	/*

	 * c0_status.cu=0 specifies that updates by the sc instruction use