// SPDX-License-Identifier: GPL-2.0-only /* * arch/sh/mm/cache-sh3.c * * Copyright (C) 1999, 2000 Niibe Yutaka * Copyright (C) 2002 Paul Mundt */ #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/processor.h> #include <asm/cache.h> #include <asm/io.h> #include <linux/uaccess.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; }