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sh: Get SH-5 caches working again post-unification.

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A number of cleanups to get the SH-5 cache management code in line with
the rest of the SH backend.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-02-13 20:14:10 +09:00
parent 5c8f82c649
commit 38350e0a00
5 changed files with 473 additions and 673 deletions
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69
arch/sh/kernel/cpu/sh5/probe.c
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@@ -20,19 +20,18 @@ int __init detect_cpu_and_cache_system(void)
{
unsigned long long cir;
/* Do peeks in real mode to avoid having to set up a mapping for the
WPC registers. On SH5-101 cut2, such a mapping would be exposed to
an address translation erratum which would make it hard to set up
correctly. */
/*
* Do peeks in real mode to avoid having to set up a mapping for
* the WPC registers. On SH5-101 cut2, such a mapping would be
* exposed to an address translation erratum which would make it
* hard to set up correctly.
*/
cir = peek_real_address_q(0x0d000008);
if ((cir & 0xffff) == 0x5103) {
if ((cir & 0xffff) == 0x5103)
boot_cpu_data.type = CPU_SH5_103;
} else if (((cir >> 32) & 0xffff) == 0x51e2) {
else if (((cir >> 32) & 0xffff) == 0x51e2)
/* CPU.VCR aliased at CIR address on SH5-101 */
boot_cpu_data.type = CPU_SH5_101;
} else {
boot_cpu_data.type = CPU_SH_NONE;
}
/*
* First, setup some sane values for the I-cache.
@@ -40,37 +39,33 @@ int __init detect_cpu_and_cache_system(void)
boot_cpu_data.icache.ways = 4;
boot_cpu_data.icache.sets = 256;
boot_cpu_data.icache.linesz = L1_CACHE_BYTES;
#if 0
/*
* FIXME: This can probably be cleaned up a bit as well.. for example,
* do we really need the way shift _and_ the way_step_shift ?? Judging
* by the existing code, I would guess no.. is there any valid reason
* why we need to be tracking this around?
*/
boot_cpu_data.icache.way_shift = 13;
boot_cpu_data.icache.way_incr = (1 << 13);
boot_cpu_data.icache.entry_shift = 5;
boot_cpu_data.icache.set_shift = 4;
boot_cpu_data.icache.way_step_shift = 16;
boot_cpu_data.icache.asid_shift = 2;
/*
* way offset = cache size / associativity, so just don't factor in
* associativity in the first place..
*/
boot_cpu_data.icache.way_ofs = boot_cpu_data.icache.sets *
boot_cpu_data.icache.linesz;
boot_cpu_data.icache.asid_mask = 0x3fc;
boot_cpu_data.icache.idx_mask = 0x1fe0;
boot_cpu_data.icache.epn_mask = 0xffffe000;
#endif
boot_cpu_data.icache.way_size = boot_cpu_data.icache.sets *
boot_cpu_data.icache.linesz;
boot_cpu_data.icache.entry_mask = 0x1fe0;
boot_cpu_data.icache.flags = 0;
/* A trivial starting point.. */
memcpy(&boot_cpu_data.dcache,
&boot_cpu_data.icache, sizeof(struct cache_info));
/*
* Next, setup some sane values for the D-cache.
*
* On the SH5, these are pretty consistent with the I-cache settings,
* so we just copy over the existing definitions.. these can be fixed
* up later, especially if we add runtime CPU probing.
*
* Though in the meantime it saves us from having to duplicate all of
* the above definitions..
*/
boot_cpu_data.dcache = boot_cpu_data.icache;
/*
* Setup any cache-related flags here
*/
#if defined(CONFIG_CACHE_WRITETHROUGH)
set_bit(SH_CACHE_MODE_WT, &(boot_cpu_data.dcache.flags));
#elif defined(CONFIG_CACHE_WRITEBACK)
set_bit(SH_CACHE_MODE_WB, &(boot_cpu_data.dcache.flags));
#endif
return 0;
}