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ARC: Don't fiddle with non-existent caches 

!CONFIG_ARC_HAS_(I|D)CACHE makes Linux disable caches (assuming they
exist in hardware) - mostly for debugging issues with new peripherals.
However, independent of CONFIG_ARC_HAS_(I|D)CACHE, Linux also needs to
handle, non-existant caches, using the information in Cache BCRs (Build
Configuration Reg)

Reported-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-01-28 15:07:31 +05:30
parent db8e35d5b2
commit d626f547dd
1 changed files with 9 additions and 12 deletions
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21
arch/arc/mm/cache_arc700.c
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@ -144,23 +144,18 @@ void __init read_decode_cache_bcr(void)
void __init arc_cache_init(void)
{
unsigned int temp;
#ifdef CONFIG_ARC_CACHE
unsigned int cpu = smp_processor_id();
#endif
#ifdef CONFIG_ARC_HAS_ICACHE
struct cpuinfo_arc_cache *ic;
#endif
#ifdef CONFIG_ARC_HAS_DCACHE
struct cpuinfo_arc_cache *dc;
#endif
struct cpuinfo_arc_cache *ic = &cpuinfo_arc700[cpu].icache;
struct cpuinfo_arc_cache *dc = &cpuinfo_arc700[cpu].dcache;
int way_pg_ratio = way_pg_ratio;
char str[256];
printk(arc_cache_mumbojumbo(0, str, sizeof(str)));
#ifdef CONFIG_ARC_HAS_ICACHE
ic = &cpuinfo_arc700[cpu].icache;
if (!ic->ver)
goto chk_dc;
#ifdef CONFIG_ARC_HAS_ICACHE
/* 1. Confirm some of I-cache params which Linux assumes */
if ((ic->assoc != ARC_ICACHE_WAYS) ||
(ic->line_len != ARC_ICACHE_LINE_LEN)) {
@ -213,9 +208,11 @@ void __init arc_cache_init(void)
write_aux_reg(ARC_REG_IC_CTRL, temp);
#ifdef CONFIG_ARC_HAS_DCACHE
dc = &cpuinfo_arc700[cpu].dcache;
chk_dc:
if (!dc->ver)
return;
#ifdef CONFIG_ARC_HAS_DCACHE
if ((dc->assoc != ARC_DCACHE_WAYS) ||
(dc->line_len != ARC_DCACHE_LINE_LEN)) {
panic("Cache H/W doesn't match kernel Config");