提交 7d53e9c4 编写于 作者: P Paul Burton 提交者: Ralf Baechle

MIPS: CM3: Add support for CM3 L2 cache.

Detect the L2 cache configuration from GCR_L2_CONFIG when a CM3 is
present in the system, rather than from Config2 which does not expose
the L2 configuration on I6400.
Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10641/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
上级 0ba3c125
......@@ -14,6 +14,7 @@
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/r4kcache.h>
#include <asm/mips-cm.h>
/*
* MIPS32/MIPS64 L2 cache handling
......@@ -94,6 +95,34 @@ static inline int mips_sc_is_activated(struct cpuinfo_mips *c)
return 1;
}
static int __init mips_sc_probe_cm3(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
unsigned long cfg = read_gcr_l2_config();
unsigned long sets, line_sz, assoc;
if (cfg & CM_GCR_L2_CONFIG_BYPASS_MSK)
return 0;
sets = cfg & CM_GCR_L2_CONFIG_SET_SIZE_MSK;
sets >>= CM_GCR_L2_CONFIG_SET_SIZE_SHF;
c->scache.sets = 64 << sets;
line_sz = cfg & CM_GCR_L2_CONFIG_LINE_SIZE_MSK;
line_sz >>= CM_GCR_L2_CONFIG_LINE_SIZE_SHF;
c->scache.linesz = 2 << line_sz;
assoc = cfg & CM_GCR_L2_CONFIG_ASSOC_MSK;
assoc >>= CM_GCR_L2_CONFIG_ASSOC_SHF;
c->scache.ways = assoc + 1;
c->scache.waysize = c->scache.sets * c->scache.linesz;
c->scache.waybit = __ffs(c->scache.waysize);
c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
return 1;
}
static inline int __init mips_sc_probe(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
......@@ -103,6 +132,9 @@ static inline int __init mips_sc_probe(void)
/* Mark as not present until probe completed */
c->scache.flags |= MIPS_CACHE_NOT_PRESENT;
if (mips_cm_revision() >= CM_REV_CM3)
return mips_sc_probe_cm3();
/* Ignore anything but MIPSxx processors */
if (!(c->isa_level & (MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M32R2 |
MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R1 |
......
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