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csky: Support icache flush without specific instructions

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Some CPUs don't support icache specific instructions to flush icache
lines in broadcast way. We use cpu control registers to flush local
icache and use IPI to notify other cores.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
This commit is contained in:
Guo Ren 2020-01-22 11:15:14 +08:00
parent a736fa1ed7
commit 761b4f694c
4 changed files with 32 additions and 9 deletions
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4
arch/csky/Kconfig
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@ -231,6 +231,10 @@ config CPU_HAS_FPU
bool "CPU has FPU coprocessor"
depends on CPU_CK807 || CPU_CK810 || CPU_CK860
config CPU_HAS_ICACHE_INS
bool "CPU has Icache invalidate instructions"
depends on CPU_HAS_CACHEV2
config CPU_HAS_TEE
bool "CPU has Trusted Execution Environment"
depends on CPU_CK810

1
arch/csky/include/asm/cache.h
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@ -16,6 +16,7 @@ void dcache_wb_line(unsigned long start);
void icache_inv_range(unsigned long start, unsigned long end);
void icache_inv_all(void);
void local_icache_inv_all(void *priv);
void dcache_wb_range(unsigned long start, unsigned long end);
void dcache_wbinv_all(void);

5
arch/csky/mm/cachev1.c
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@ -94,6 +94,11 @@ void icache_inv_all(void)
cache_op_all(INS_CACHE|CACHE_INV, 0);
}
void local_icache_inv_all(void *priv)
{
cache_op_all(INS_CACHE|CACHE_INV, 0);
}
void dcache_wb_range(unsigned long start, unsigned long end)
{
cache_op_range(start, end, DATA_CACHE|CACHE_CLR, 0);

31
arch/csky/mm/cachev2.c
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@ -3,15 +3,25 @@
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <asm/cache.h>
#include <asm/barrier.h>
inline void dcache_wb_line(unsigned long start)
#define INS_CACHE (1 << 0)
#define CACHE_INV (1 << 4)
void local_icache_inv_all(void *priv)
{
asm volatile("dcache.cval1 %0\n"::"r"(start):"memory");
mtcr("cr17", INS_CACHE|CACHE_INV);
sync_is();
}
void icache_inv_all(void)
{
on_each_cpu(local_icache_inv_all, NULL, 1);
}
#ifdef CONFIG_CPU_HAS_ICACHE_INS
void icache_inv_range(unsigned long start, unsigned long end)
{
unsigned long i = start & ~(L1_CACHE_BYTES - 1);
@ -20,10 +30,16 @@ void icache_inv_range(unsigned long start, unsigned long end)
asm volatile("icache.iva %0\n"::"r"(i):"memory");
sync_is();
}
void icache_inv_all(void)
#else
void icache_inv_range(unsigned long start, unsigned long end)
{
asm volatile("icache.ialls\n":::"memory");
icache_inv_all();
}
#endif
inline void dcache_wb_line(unsigned long start)
{
asm volatile("dcache.cval1 %0\n"::"r"(start):"memory");
sync_is();
}
@ -53,10 +69,7 @@ void cache_wbinv_range(unsigned long start, unsigned long end)
asm volatile("dcache.cval1 %0\n"::"r"(i):"memory");
sync_is();
i = start & ~(L1_CACHE_BYTES - 1);
for (; i < end; i += L1_CACHE_BYTES)
asm volatile("icache.iva %0\n"::"r"(i):"memory");
sync_is();
icache_inv_range(start, end);
}
EXPORT_SYMBOL(cache_wbinv_range);