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authorChris Dearman <chris@mips.com>2007-09-19 00:58:24 +0100
committerRalf Baechle <ralf@linux-mips.org>2008-04-28 17:14:25 +0100
commit351336929ccf222ae38ff0cb7a8dd5fd5c6236a0 (patch)
treed9e9253bd30cf011d248ad3b63761a9a725e5cb0 /arch
parentbec5052743ec8ae4c5669918cf9b130bf15709a2 (diff)
[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: Chris Dearman <chris@mips.com> Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig.debug10
-rw-r--r--arch/mips/configs/mipssim_defconfig1
-rw-r--r--arch/mips/configs/pnx8550-jbs_defconfig1
-rw-r--r--arch/mips/configs/pnx8550-stb810_defconfig1
-rw-r--r--arch/mips/mm/c-r4k.c19
-rw-r--r--arch/mips/mm/cache.c31
-rw-r--r--arch/mips/philips/pnx8550/jbs/board_setup.c4
-rw-r--r--arch/mips/philips/pnx8550/stb810/board_setup.c4
8 files changed, 45 insertions, 26 deletions
diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index fd7124c1b75a..f18cf92650e3 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -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
diff --git a/arch/mips/configs/mipssim_defconfig b/arch/mips/configs/mipssim_defconfig
index 6db0bdaefb27..4f6bce99d5cf 100644
--- a/arch/mips/configs/mipssim_defconfig
+++ b/arch/mips/configs/mipssim_defconfig
@@ -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
diff --git a/arch/mips/configs/pnx8550-jbs_defconfig b/arch/mips/configs/pnx8550-jbs_defconfig
index 518a60892b78..780c7fc24b82 100644
--- a/arch/mips/configs/pnx8550-jbs_defconfig
+++ b/arch/mips/configs/pnx8550-jbs_defconfig
@@ -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
diff --git a/arch/mips/configs/pnx8550-stb810_defconfig b/arch/mips/configs/pnx8550-stb810_defconfig
index 68351eb81bc8..267f21ed1d0f 100644
--- a/arch/mips/configs/pnx8550-stb810_defconfig
+++ b/arch/mips/configs/pnx8550-stb810_defconfig
@@ -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
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 77aefb4ebedd..3d3e53651341 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -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
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index f5903679ee6a..034e8506f6ea 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -130,8 +130,28 @@ void __update_cache(struct vm_area_struct *vma, unsigned long address,
}
}
-static char cache_panic[] __cpuinitdata =
- "Yeee, unsupported cache architecture.";
+unsigned long _page_cachable_default;
+EXPORT_SYMBOL_GPL(_page_cachable_default);
+
+static inline void setup_protection_map(void)
+{
+ protection_map[0] = PAGE_NONE;
+ protection_map[1] = PAGE_READONLY;
+ protection_map[2] = PAGE_COPY;
+ protection_map[3] = PAGE_COPY;
+ protection_map[4] = PAGE_READONLY;
+ protection_map[5] = PAGE_READONLY;
+ protection_map[6] = PAGE_COPY;
+ protection_map[7] = PAGE_COPY;
+ protection_map[8] = PAGE_NONE;
+ protection_map[9] = PAGE_READONLY;
+ protection_map[10] = PAGE_SHARED;
+ protection_map[11] = PAGE_SHARED;
+ protection_map[12] = PAGE_READONLY;
+ protection_map[13] = PAGE_READONLY;
+ protection_map[14] = PAGE_SHARED;
+ protection_map[15] = PAGE_SHARED;
+}
void __devinit cpu_cache_init(void)
{
@@ -139,34 +159,29 @@ void __devinit cpu_cache_init(void)
extern void __weak r3k_cache_init(void);
r3k_cache_init();
- return;
}
if (cpu_has_6k_cache) {
extern void __weak r6k_cache_init(void);
r6k_cache_init();
- return;
}
if (cpu_has_4k_cache) {
extern void __weak r4k_cache_init(void);
r4k_cache_init();
- return;
}
if (cpu_has_8k_cache) {
extern void __weak r8k_cache_init(void);
r8k_cache_init();
- return;
}
if (cpu_has_tx39_cache) {
extern void __weak tx39_cache_init(void);
tx39_cache_init();
- return;
}
- panic(cache_panic);
+ setup_protection_map();
}
int __weak __uncached_access(struct file *file, unsigned long addr)
diff --git a/arch/mips/philips/pnx8550/jbs/board_setup.c b/arch/mips/philips/pnx8550/jbs/board_setup.c
index f92826e0096d..e550a3e12f65 100644
--- a/arch/mips/philips/pnx8550/jbs/board_setup.c
+++ b/arch/mips/philips/pnx8550/jbs/board_setup.c
@@ -53,8 +53,8 @@ void __init board_setup(void)
/* clear all three cache coherency fields */
config0 &= ~(0x7 | (7<<25) | (7<<28));
- config0 |= (CONF_CM_DEFAULT | (CONF_CM_DEFAULT<<25) |
- (CONF_CM_DEFAULT<<28));
+ config0 |= (_page_cachable_default >> _CACHE_SHIFT) |
+ (CONF_CM_DEFAULT << 25) | (CONF_CM_DEFAULT << 28);
write_c0_config(config0);
BARRIER;
diff --git a/arch/mips/philips/pnx8550/stb810/board_setup.c b/arch/mips/philips/pnx8550/stb810/board_setup.c
index 345d71e53cf2..d461d7a62365 100644
--- a/arch/mips/philips/pnx8550/stb810/board_setup.c
+++ b/arch/mips/philips/pnx8550/stb810/board_setup.c
@@ -39,8 +39,8 @@ void __init board_setup(void)
/* clear all three cache coherency fields */
config0 &= ~(0x7 | (7<<25) | (7<<28));
- config0 |= (CONF_CM_DEFAULT | (CONF_CM_DEFAULT<<25) |
- (CONF_CM_DEFAULT<<28));
+ config0 |= (_page_cachable_default >> _CACHE_SHIFT) |
+ (CONF_CM_DEFAULT << 25) | (CONF_CM_DEFAULT << 28);
write_c0_config(config0);
configpr = read_c0_config7();