diff options
Diffstat (limited to 'kernel/arch/sh/mm/cache-sh2a.c')
| -rw-r--r-- | kernel/arch/sh/mm/cache-sh2a.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/kernel/arch/sh/mm/cache-sh2a.c b/kernel/arch/sh/mm/cache-sh2a.c new file mode 100644 index 000000000..ee87d0812 --- /dev/null +++ b/kernel/arch/sh/mm/cache-sh2a.c @@ -0,0 +1,189 @@ +/* + * arch/sh/mm/cache-sh2a.c + * + * Copyright (C) 2008 Yoshinori Sato + * + * Released under the terms of the GNU GPL v2.0. + */ + +#include <linux/init.h> +#include <linux/mm.h> + +#include <asm/cache.h> +#include <asm/addrspace.h> +#include <asm/processor.h> +#include <asm/cacheflush.h> +#include <asm/io.h> + +/* + * The maximum number of pages we support up to when doing ranged dcache + * flushing. Anything exceeding this will simply flush the dcache in its + * entirety. + */ +#define MAX_OCACHE_PAGES 32 +#define MAX_ICACHE_PAGES 32 + +#ifdef CONFIG_CACHE_WRITEBACK +static void sh2a_flush_oc_line(unsigned long v, int way) +{ + unsigned long addr = (v & 0x000007f0) | (way << 11); + unsigned long data; + + data = __raw_readl(CACHE_OC_ADDRESS_ARRAY | addr); + if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) { + data &= ~SH_CACHE_UPDATED; + __raw_writel(data, CACHE_OC_ADDRESS_ARRAY | addr); + } +} +#endif + +static void sh2a_invalidate_line(unsigned long cache_addr, unsigned long v) +{ + /* Set associative bit to hit all ways */ + unsigned long addr = (v & 0x000007f0) | SH_CACHE_ASSOC; + __raw_writel((addr & CACHE_PHYSADDR_MASK), cache_addr | addr); +} + +/* + * Write back the dirty D-caches, but not invalidate them. + */ +static void sh2a__flush_wback_region(void *start, int size) +{ +#ifdef CONFIG_CACHE_WRITEBACK + unsigned long v; + unsigned long begin, end; + unsigned long flags; + int nr_ways; + + begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); + end = ((unsigned long)start + size + L1_CACHE_BYTES-1) + & ~(L1_CACHE_BYTES-1); + nr_ways = current_cpu_data.dcache.ways; + + local_irq_save(flags); + jump_to_uncached(); + + /* If there are too many pages then flush the entire cache */ + if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) { + begin = CACHE_OC_ADDRESS_ARRAY; + end = begin + (nr_ways * current_cpu_data.dcache.way_size); + + for (v = begin; v < end; v += L1_CACHE_BYTES) { + unsigned long data = __raw_readl(v); + if (data & SH_CACHE_UPDATED) + __raw_writel(data & ~SH_CACHE_UPDATED, v); + } + } else { + int way; + for (way = 0; way < nr_ways; way++) { + for (v = begin; v < end; v += L1_CACHE_BYTES) + sh2a_flush_oc_line(v, way); + } + } + + back_to_cached(); + local_irq_restore(flags); +#endif +} + +/* + * Write back the dirty D-caches and invalidate them. + */ +static void sh2a__flush_purge_region(void *start, int size) +{ + unsigned long v; + 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); + + local_irq_save(flags); + jump_to_uncached(); + + for (v = begin; v < end; v+=L1_CACHE_BYTES) { +#ifdef CONFIG_CACHE_WRITEBACK + int way; + int nr_ways = current_cpu_data.dcache.ways; + for (way = 0; way < nr_ways; way++) + sh2a_flush_oc_line(v, way); +#endif + sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v); + } + + back_to_cached(); + local_irq_restore(flags); +} + +/* + * Invalidate the D-caches, but no write back please + */ +static void sh2a__flush_invalidate_region(void *start, int size) +{ + unsigned long v; + 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); + + local_irq_save(flags); + jump_to_uncached(); + + /* If there are too many pages then just blow the cache */ + if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) { + __raw_writel(__raw_readl(SH_CCR) | CCR_OCACHE_INVALIDATE, + SH_CCR); + } else { + for (v = begin; v < end; v += L1_CACHE_BYTES) + sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v); + } + + back_to_cached(); + local_irq_restore(flags); +} + +/* + * Write back the range of D-cache, and purge the I-cache. + */ +static void sh2a_flush_icache_range(void *args) +{ + struct flusher_data *data = args; + unsigned long start, end; + unsigned long v; + unsigned long flags; + + start = data->addr1 & ~(L1_CACHE_BYTES-1); + end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1); + +#ifdef CONFIG_CACHE_WRITEBACK + sh2a__flush_wback_region((void *)start, end-start); +#endif + + local_irq_save(flags); + jump_to_uncached(); + + /* I-Cache invalidate */ + /* If there are too many pages then just blow the cache */ + if (((end - start) >> PAGE_SHIFT) >= MAX_ICACHE_PAGES) { + __raw_writel(__raw_readl(SH_CCR) | CCR_ICACHE_INVALIDATE, + SH_CCR); + } else { + for (v = start; v < end; v += L1_CACHE_BYTES) + sh2a_invalidate_line(CACHE_IC_ADDRESS_ARRAY, v); + } + + back_to_cached(); + local_irq_restore(flags); +} + +void __init sh2a_cache_init(void) +{ + local_flush_icache_range = sh2a_flush_icache_range; + + __flush_wback_region = sh2a__flush_wback_region; + __flush_purge_region = sh2a__flush_purge_region; + __flush_invalidate_region = sh2a__flush_invalidate_region; +} |