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sh: Support for L2 cache on newer SH-4A CPUs.

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This implements preliminary support for the L2 caches found
on newer SH-4A CPUs.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2006-09-27 18:27:43 +09:00
parent 9d549a7d8e
commit 72c35543f8
4 changed files with 57 additions and 6 deletions
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47
arch/sh/kernel/cpu/sh4/probe.c
View File

@ -29,7 +29,7 @@ int __init detect_cpu_and_cache_system(void)
[9] = (1 << 16)
};
pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffff;
pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
cvr = (ctrl_inl(CCN_CVR));
@ -53,6 +53,26 @@ int __init detect_cpu_and_cache_system(void)
cpu_data->dcache.ways = 1;
cpu_data->dcache.linesz = L1_CACHE_BYTES;
/*
* Setup some generic flags we can probe
* (L2 and DSP detection only work on SH-4A)
*/
if (((pvr >> 16) & 0xff) == 0x10) {
if ((cvr & 0x02000000) == 0)
cpu_data->flags |= CPU_HAS_L2_CACHE;
if ((cvr & 0x10000000) == 0)
cpu_data->flags |= CPU_HAS_DSP;
cpu_data->flags |= CPU_HAS_LLSC;
}
/* FPU detection works for everyone */
if ((cvr & 0x20000000) == 1)
cpu_data->flags |= CPU_HAS_FPU;
/* Mask off the upper chip ID */
pvr &= 0xffff;
/*
* Probe the underlying processor version/revision and
* adjust cpu_data setup accordingly.
@ -181,5 +201,30 @@ int __init detect_cpu_and_cache_system(void)
cpu_data->dcache.way_size = cpu_data->dcache.sets *
cpu_data->dcache.linesz;
/*
* Setup the L2 cache desc
*
* SH-4A's have an optional PIPT L2.
*/
if (cpu_data->flags & CPU_HAS_L2_CACHE) {
/*
* Size calculation is much more sensible
* than it is for the L1.
*
* Sizes are 128KB, 258KB, 512KB, and 1MB.
*/
size = (cvr & 0xf) << 17;
BUG_ON(!size);
cpu_data->scache.way_incr = (1 << 16);
cpu_data->scache.entry_shift = 5;
cpu_data->scache.entry_mask = 0xffe0;
cpu_data->scache.ways = 4;
cpu_data->scache.linesz = L1_CACHE_BYTES;
cpu_data->scache.sets = size /
(cpu_data->scache.linesz * cpu_data->scache.ways);
}
return 0;
}

6
arch/sh/kernel/setup.c
View File

@ -416,7 +416,7 @@ const char *get_cpu_subtype(void)
/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
static const char *cpu_flags[] = {
"none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
"ptea", "llsc", NULL
"ptea", "llsc", "l2", NULL
};
static void show_cpuflags(struct seq_file *m)
@ -480,6 +480,10 @@ static int show_cpuinfo(struct seq_file *m, void *v)
show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
}
/* Optional secondary cache */
if (boot_cpu_data.flags & CPU_HAS_L2_CACHE)
show_cacheinfo(m, "scache", boot_cpu_data.scache);
seq_printf(m, "bogomips\t: %lu.%02lu\n",
boot_cpu_data.loops_per_jiffy/(500000/HZ),
(boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);

1
include/asm-sh/cpu-features.h
View File

@ -19,5 +19,6 @@
#define CPU_HAS_PERF_COUNTER 0x0010 /* Hardware performance counters */
#define CPU_HAS_PTEA 0x0020 /* PTEA register */
#define CPU_HAS_LLSC 0x0040 /* movli.l/movco.l */
#define CPU_HAS_L2_CACHE 0x0080 /* Secondary cache / URAM */
#endif /* __ASM_SH_CPU_FEATURES_H */

9
include/asm-sh/processor.h
View File

@ -54,14 +54,15 @@ enum cpu_type {
};
struct sh_cpuinfo {
enum cpu_type type;
unsigned int type;
unsigned long loops_per_jiffy;
struct cache_info icache;
struct cache_info dcache;
struct cache_info icache; /* Primary I-cache */
struct cache_info dcache; /* Primary D-cache */
struct cache_info scache; /* Secondary cache */
unsigned long flags;
};
} __attribute__ ((aligned(SMP_CACHE_BYTES)));
extern struct sh_cpuinfo boot_cpu_data;