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| author | Imre Kaloz <kaloz@openwrt.org> | 2012-12-23 18:53:38 +0000 |
|---|---|---|
| committer | Imre Kaloz <kaloz@openwrt.org> | 2012-12-23 18:53:38 +0000 |
| commit | f19b976355fbf898fe48689bfff8184fc82c8181 (patch) | |
| tree | 0f4e19f9d449ba5eb4050a3dddfd8961c2403233 /target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch | |
| parent | dd4befa7e284a09375d7e7700b1f220be35e5b8a (diff) | |
| download | upstream-f19b976355fbf898fe48689bfff8184fc82c8181.tar.gz upstream-f19b976355fbf898fe48689bfff8184fc82c8181.tar.bz2 upstream-f19b976355fbf898fe48689bfff8184fc82c8181.zip | |
[cns3xxx]: add nol2x0 cmdline to disable l2x0 cache
L2 cache via L2X0 cache controller available on some ARM boards can
provide a performance boost in some situations but decrease performance
in others. This adds a kernel cmdline to disable L2X0 for cns3xxx based
boards.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34874 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch')
| -rw-r--r-- | target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch b/target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch new file mode 100644 index 0000000000..87b1090166 --- /dev/null +++ b/target/linux/cns3xxx/patches-3.3/097-l2x0_cmdline_disable.patch @@ -0,0 +1,47 @@ +--- a/arch/arm/mach-cns3xxx/core.c ++++ b/arch/arm/mach-cns3xxx/core.c +@@ -284,11 +284,24 @@ struct sys_timer cns3xxx_timer = { + + #ifdef CONFIG_CACHE_L2X0 + ++static int cns3xxx_l2x0_enable = 1; ++ ++static int __init cns3xxx_l2x0_disable(char *s) ++{ ++ cns3xxx_l2x0_enable = 0; ++ return 1; ++} ++__setup("nol2x0", cns3xxx_l2x0_disable); ++ + void __init cns3xxx_l2x0_init(void) + { +- void __iomem *base = ioremap(CNS3XXX_L2C_BASE, SZ_4K); ++ void __iomem *base; + u32 val; + ++ if (!cns3xxx_l2x0_enable) ++ return; ++ ++ base = ioremap(CNS3XXX_L2C_BASE, SZ_4K); + if (WARN_ON(!base)) + return; + +@@ -321,6 +334,7 @@ void __init cns3xxx_l2x0_init(void) + /* 32 KiB, 8-way, parity disable */ + l2x0_init(base, 0x00540000, 0xfe000fff); + } ++arch_initcall(cns3xxx_l2x0_init); + + #endif /* CONFIG_CACHE_L2X0 */ + +--- a/arch/arm/mach-cns3xxx/cns3420vb.c ++++ b/arch/arm/mach-cns3xxx/cns3420vb.c +@@ -193,8 +193,6 @@ static struct platform_device *cns3420_p + + static void __init cns3420_init(void) + { +- cns3xxx_l2x0_init(); +- + platform_add_devices(cns3420_pdevs, ARRAY_SIZE(cns3420_pdevs)); + + cns3xxx_ahci_init(); |