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arc: add support for SLC (System Level Cache, AKA L2-cache)

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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 <abrodkin@synopsys.com>
This commit is contained in:
Alexey Brodkin
2015-03-30 13:36:04 +03:00
parent 09424d1119
commit 6eb15e50f4
4 changed files with 65 additions and 0 deletions
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46
arch/arc/lib/cache.c
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@@ -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 */