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author | Paul Mundt <lethal@linux-sh.org> | 2006-09-27 18:27:43 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2006-09-27 18:27:43 +0900 |
commit | 72c35543f8cf1316773ffbd9619575bb84ac44fb (patch) | |
tree | 5dc8ba51079cbc65be0ee0e881da03e6ac0b0b5b /arch/sh/kernel/cpu/sh4/probe.c | |
parent | 9d549a7d8ef71f684a35cf1e438543957cf81d12 (diff) | |
download | kernel_samsung_smdk4412-72c35543f8cf1316773ffbd9619575bb84ac44fb.zip kernel_samsung_smdk4412-72c35543f8cf1316773ffbd9619575bb84ac44fb.tar.gz kernel_samsung_smdk4412-72c35543f8cf1316773ffbd9619575bb84ac44fb.tar.bz2 |
sh: Support for L2 cache on newer SH-4A CPUs.
This implements preliminary support for the L2 caches found
on newer SH-4A CPUs.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/probe.c')
-rw-r--r-- | arch/sh/kernel/cpu/sh4/probe.c | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/arch/sh/kernel/cpu/sh4/probe.c b/arch/sh/kernel/cpu/sh4/probe.c index 0e65aa6..bee00ca 100644 --- a/arch/sh/kernel/cpu/sh4/probe.c +++ b/arch/sh/kernel/cpu/sh4/probe.c @@ -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)); @@ -54,6 +54,26 @@ int __init detect_cpu_and_cache_system(void) 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; } |