diff options
Diffstat (limited to 'kernel/arch/sh/mm/cache-sh3.c')
| -rw-r--r-- | kernel/arch/sh/mm/cache-sh3.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/kernel/arch/sh/mm/cache-sh3.c b/kernel/arch/sh/mm/cache-sh3.c new file mode 100644 index 000000000..e37523f65 --- /dev/null +++ b/kernel/arch/sh/mm/cache-sh3.c @@ -0,0 +1,105 @@ +/* + * arch/sh/mm/cache-sh3.c + * + * Copyright (C) 1999, 2000 Niibe Yutaka + * Copyright (C) 2002 Paul Mundt + * + * Released under the terms of the GNU GPL v2.0. + */ + +#include <linux/init.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/threads.h> +#include <asm/addrspace.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/processor.h> +#include <asm/cache.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> +#include <asm/cacheflush.h> + +/* + * Write back the dirty D-caches, but not invalidate them. + * + * Is this really worth it, or should we just alias this routine + * to __flush_purge_region too? + * + * START: Virtual Address (U0, P1, or P3) + * SIZE: Size of the region. + */ + +static void sh3__flush_wback_region(void *start, int size) +{ + unsigned long v, j; + unsigned long begin, end; + unsigned long flags; + + begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); + end = ((unsigned long)start + size + L1_CACHE_BYTES-1) + & ~(L1_CACHE_BYTES-1); + + for (v = begin; v < end; v+=L1_CACHE_BYTES) { + unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY; + for (j = 0; j < current_cpu_data.dcache.ways; j++) { + unsigned long data, addr, p; + + p = __pa(v); + addr = addrstart | (v & current_cpu_data.dcache.entry_mask); + local_irq_save(flags); + data = __raw_readl(addr); + + if ((data & CACHE_PHYSADDR_MASK) == + (p & CACHE_PHYSADDR_MASK)) { + data &= ~SH_CACHE_UPDATED; + __raw_writel(data, addr); + local_irq_restore(flags); + break; + } + local_irq_restore(flags); + addrstart += current_cpu_data.dcache.way_incr; + } + } +} + +/* + * Write back the dirty D-caches and invalidate them. + * + * START: Virtual Address (U0, P1, or P3) + * SIZE: Size of the region. + */ +static void sh3__flush_purge_region(void *start, int size) +{ + unsigned long v; + unsigned long begin, end; + + begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); + end = ((unsigned long)start + size + L1_CACHE_BYTES-1) + & ~(L1_CACHE_BYTES-1); + + for (v = begin; v < end; v+=L1_CACHE_BYTES) { + unsigned long data, addr; + + data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */ + addr = CACHE_OC_ADDRESS_ARRAY | + (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC; + __raw_writel(data, addr); + } +} + +void __init sh3_cache_init(void) +{ + __flush_wback_region = sh3__flush_wback_region; + __flush_purge_region = sh3__flush_purge_region; + + /* + * No write back please + * + * Except I don't think there's any way to avoid the writeback. + * So we just alias it to sh3__flush_purge_region(). dwmw2. + */ + __flush_invalidate_region = sh3__flush_purge_region; +} |