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| author | Ronen Shitrit <rshitrit@marvell.com> | 2008-09-23 15:28:10 +0300 |
|---|---|---|
| committer | Nicolas Pitre <nico@cam.org> | 2008-09-25 16:29:21 -0400 |
| commit | 4360bb41920ffacd4a935fa692768129ee5bef4e (patch) | |
| tree | 8d5bbe15ad4c39d089ac42ab0330d8c515584f65 | |
| parent | 3d014b01e54ce08d15a598f0bfb3ce597f14ca03 (diff) | |
| download | op-kernel-dev-4360bb41920ffacd4a935fa692768129ee5bef4e.zip op-kernel-dev-4360bb41920ffacd4a935fa692768129ee5bef4e.tar.gz | |
[ARM] Kirkwood: add support for L2 cache WB/WT selection
Feroceon L2 cache can work in eighther write through or write back mode
on Kirkwood. Add the option to configure this mode according to Kconfig.
Signed-off-by: Ronen Shitrit <rshitrit@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
| -rw-r--r-- | arch/arm/mach-kirkwood/common.c | 12 | ||||
| -rw-r--r-- | arch/arm/mm/Kconfig | 8 | ||||
| -rw-r--r-- | arch/arm/mm/proc-feroceon.S | 12 |
3 files changed, 25 insertions, 7 deletions
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c index c8516e3..85cad05 100644 --- a/arch/arm/mach-kirkwood/common.c +++ b/arch/arm/mach-kirkwood/common.c @@ -588,9 +588,15 @@ static char * __init kirkwood_id(void) } } -static int __init is_l2_writethrough(void) +static void __init kirkwood_l2_init(void) { - return !!(readl(L2_CONFIG_REG) & L2_WRITETHROUGH); +#ifdef CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH + writel(readl(L2_CONFIG_REG) | L2_WRITETHROUGH, L2_CONFIG_REG); + feroceon_l2_init(1); +#else + writel(readl(L2_CONFIG_REG) & ~L2_WRITETHROUGH, L2_CONFIG_REG); + feroceon_l2_init(0); +#endif } void __init kirkwood_init(void) @@ -605,6 +611,6 @@ void __init kirkwood_init(void) kirkwood_setup_cpu_mbus(); #ifdef CONFIG_CACHE_FEROCEON_L2 - feroceon_l2_init(is_l2_writethrough()); + kirkwood_l2_init(); #endif } diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index ed15f87..330814d 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -735,6 +735,14 @@ config CACHE_FEROCEON_L2 help This option enables the Feroceon L2 cache controller. +config CACHE_FEROCEON_L2_WRITETHROUGH + bool "Force Feroceon L2 cache write through" + depends on CACHE_FEROCEON_L2 + default n + help + Say Y here to use the Feroceon L2 cache in writethrough mode. + Unless you specifically require this, say N for writeback mode. + config CACHE_L2X0 bool "Enable the L2x0 outer cache controller" depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 diff --git a/arch/arm/mm/proc-feroceon.S b/arch/arm/mm/proc-feroceon.S index f2e5884..207392f 100644 --- a/arch/arm/mm/proc-feroceon.S +++ b/arch/arm/mm/proc-feroceon.S @@ -80,7 +80,8 @@ ENTRY(cpu_feroceon_proc_fin) msr cpsr_c, ip bl feroceon_flush_kern_cache_all -#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH) +#if defined(CONFIG_CACHE_FEROCEON_L2) && \ + !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mov r0, #0 mcr p15, 1, r0, c15, c9, 0 @ clean L2 mcr p15, 0, r0, c7, c10, 4 @ drain WB @@ -389,7 +390,8 @@ ENTRY(feroceon_range_cache_fns) .align 5 ENTRY(cpu_feroceon_dcache_clean_area) -#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH) +#if defined(CONFIG_CACHE_FEROCEON_L2) && \ + !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mov r2, r0 mov r3, r1 #endif @@ -397,7 +399,8 @@ ENTRY(cpu_feroceon_dcache_clean_area) add r0, r0, #CACHE_DLINESIZE subs r1, r1, #CACHE_DLINESIZE bhi 1b -#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH) +#if defined(CONFIG_CACHE_FEROCEON_L2) && \ + !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) 1: mcr p15, 1, r2, c15, c9, 1 @ clean L2 entry add r2, r2, #CACHE_DLINESIZE subs r3, r3, #CACHE_DLINESIZE @@ -466,7 +469,8 @@ ENTRY(cpu_feroceon_set_pte_ext) str r2, [r0] @ hardware version mov r0, r0 mcr p15, 0, r0, c7, c10, 1 @ clean D entry -#if defined(CONFIG_CACHE_FEROCEON_L2) && !defined(CONFIG_L2_CACHE_WRITETHROUGH) +#if defined(CONFIG_CACHE_FEROCEON_L2) && \ + !defined(CONFIG_CACHE_FEROCEON_L2_WRITETHROUGH) mcr p15, 1, r0, c15, c9, 1 @ clean L2 entry #endif mcr p15, 0, r0, c7, c10, 4 @ drain WB |
