From ae4a351ad9e3b800e8eb55b27c302d8be256540e Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Fri, 27 Mar 2015 12:47:29 +0300 Subject: arc: cache - build invalidate_icache_all() and invalidate_dcache_all() always Make both invalidate_icache_all() and invalidate_dcache_all() available even if U-Boot is configured with CONFIG_SYS_DCACHE_OFF and/or CONFIG_SYS_ICACHE_OFF. This is useful because configuration of U-Boot may not match actual hardware features. Real board may have cache(s) but for some reason we may want to run U-Boot with cache(s) disabled (for example if some peripherals work improperly with existing drivers if data cache is enabled). So board may start with cache(s) enabled (that's the case for ARC cores with built-in caches) but early in U-Boot we disable cache(s) and make sure all contents of data cache gets flushed in RAM. Signed-off-by: Alexey Brodkin --- arch/arc/lib/cache.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'arch/arc/lib/cache.c') diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c index a2277231ba..30f045a864 100644 --- a/arch/arc/lib/cache.c +++ b/arch/arc/lib/cache.c @@ -49,10 +49,12 @@ void icache_disable(void) void invalidate_icache_all(void) { -#ifndef CONFIG_SYS_ICACHE_OFF + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return; + /* Any write to IC_IVIC register triggers invalidation of entire I$ */ write_aux_reg(ARC_AUX_IC_IVIC, 1); -#endif /* CONFIG_SYS_ICACHE_OFF */ } int dcache_status(void) @@ -156,10 +158,12 @@ void invalidate_dcache_range(unsigned long start, unsigned long end) void invalidate_dcache_all(void) { -#ifndef CONFIG_SYS_DCACHE_OFF + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + /* Write 1 to DC_IVDC register triggers invalidation of entire D$ */ write_aux_reg(ARC_AUX_DC_IVDC, 1); -#endif /* CONFIG_SYS_DCACHE_OFF */ } void flush_cache(unsigned long start, unsigned long size) -- cgit From 6eb15e50f48927c65a67371555b5afc24b3c7d21 Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Mon, 30 Mar 2015 13:36:04 +0300 Subject: arc: add support for SLC (System Level Cache, AKA L2-cache) ARCv2 cores may have built-in SLC (System Level Cache, AKA L2-cache). This change adds functions required for controlling SLC: * slc_enable/disable * slc_flush/invalidate For now we just disable SLC to escape DMA coherency issues until either: * SLC flush/invalidate is supported in DMA APIin U-Boot * hardware DMA coherency is implemented (that might be board specific so probably we'll need to have a separate Kconfig option for controlling SLC explicitly) Signed-off-by: Alexey Brodkin --- arch/arc/lib/cache.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'arch/arc/lib/cache.c') diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c index 30f045a864..e369e5a856 100644 --- a/arch/arc/lib/cache.c +++ b/arch/arc/lib/cache.c @@ -16,6 +16,7 @@ #define DC_CTRL_INV_MODE_FLUSH (1 << 6) #define DC_CTRL_FLUSH_STATUS (1 << 8) #define CACHE_VER_NUM_MASK 0xF +#define SLC_CTRL_SB (1 << 2) int icache_status(void) { @@ -170,3 +171,48 @@ void flush_cache(unsigned long start, unsigned long size) { flush_dcache_range(start, start + size); } + +#ifdef CONFIG_ISA_ARCV2 +void slc_enable(void) +{ + /* If SLC ver = 0, no SLC present in CPU */ + if (!(read_aux_reg(ARC_BCR_SLC) & 0xff)) + return; + + write_aux_reg(ARC_AUX_SLC_CONTROL, + read_aux_reg(ARC_AUX_SLC_CONTROL) & ~1); +} + +void slc_disable(void) +{ + /* If SLC ver = 0, no SLC present in CPU */ + if (!(read_aux_reg(ARC_BCR_SLC) & 0xff)) + return; + + write_aux_reg(ARC_AUX_SLC_CONTROL, + read_aux_reg(ARC_AUX_SLC_CONTROL) | 1); +} + +void slc_flush(void) +{ + /* If SLC ver = 0, no SLC present in CPU */ + if (!(read_aux_reg(ARC_BCR_SLC) & 0xff)) + return; + + write_aux_reg(ARC_AUX_SLC_FLUSH, 1); + + /* Wait flush end */ + while (read_aux_reg(ARC_AUX_SLC_CONTROL) & SLC_CTRL_SB) + ; +} + +void slc_invalidate(void) +{ + /* If SLC ver = 0, no SLC present in CPU */ + if (!(read_aux_reg(ARC_BCR_SLC) & 0xff)) + return; + + write_aux_reg(ARC_AUX_SLC_INVALIDATE, 1); +} + +#endif /* CONFIG_ISA_ARCV2 */ -- cgit