diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/probe.c')
| -rw-r--r-- | arch/sh/kernel/cpu/sh4/probe.c | 61 |
1 files changed, 33 insertions, 28 deletions
diff --git a/arch/sh/kernel/cpu/sh4/probe.c b/arch/sh/kernel/cpu/sh4/probe.c index 7d821ce8434f..28a2f0db01db 100644 --- a/arch/sh/kernel/cpu/sh4/probe.c +++ b/arch/sh/kernel/cpu/sh4/probe.c @@ -134,7 +134,7 @@ int __init detect_cpu_and_cache_system(void) boot_cpu_data.icache.ways = 4; boot_cpu_data.dcache.ways = 4; boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER | - CPU_HAS_LLSC | CPU_HAS_PTEAEX; + CPU_HAS_LLSC | CPU_HAS_PTEAEX | CPU_HAS_L2_CACHE; break; case 0x3008: boot_cpu_data.icache.ways = 4; @@ -228,43 +228,48 @@ int __init detect_cpu_and_cache_system(void) } /* - * Setup the L2 cache desc - * * SH-4A's have an optional PIPT L2. */ if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) { - /* Bug if we can't decode the L2 info */ - BUG_ON(!(cvr & 0xf)); - - /* Silicon and specifications have clearly never met.. */ - cvr ^= 0xf; - /* - * Size calculation is much more sensible - * than it is for the L1. - * - * Sizes are 128KB, 258KB, 512KB, and 1MB. + * Verify that it really has something hooked up, this + * is the safety net for CPUs that have optional L2 + * support yet do not implement it. */ - size = (cvr & 0xf) << 17; + if ((cvr & 0xf) == 0) + boot_cpu_data.flags &= ~CPU_HAS_L2_CACHE; + else { + /* + * Silicon and specifications have clearly never + * met.. + */ + cvr ^= 0xf; - BUG_ON(!size); + /* + * Size calculation is much more sensible + * than it is for the L1. + * + * Sizes are 128KB, 258KB, 512KB, and 1MB. + */ + size = (cvr & 0xf) << 17; - boot_cpu_data.scache.way_incr = (1 << 16); - boot_cpu_data.scache.entry_shift = 5; - boot_cpu_data.scache.ways = 4; - boot_cpu_data.scache.linesz = L1_CACHE_BYTES; + boot_cpu_data.scache.way_incr = (1 << 16); + boot_cpu_data.scache.entry_shift = 5; + boot_cpu_data.scache.ways = 4; + boot_cpu_data.scache.linesz = L1_CACHE_BYTES; - boot_cpu_data.scache.entry_mask = - (boot_cpu_data.scache.way_incr - - boot_cpu_data.scache.linesz); + boot_cpu_data.scache.entry_mask = + (boot_cpu_data.scache.way_incr - + boot_cpu_data.scache.linesz); - boot_cpu_data.scache.sets = size / - (boot_cpu_data.scache.linesz * - boot_cpu_data.scache.ways); + boot_cpu_data.scache.sets = size / + (boot_cpu_data.scache.linesz * + boot_cpu_data.scache.ways); - boot_cpu_data.scache.way_size = - (boot_cpu_data.scache.sets * - boot_cpu_data.scache.linesz); + boot_cpu_data.scache.way_size = + (boot_cpu_data.scache.sets * + boot_cpu_data.scache.linesz); + } } return 0; |