1 /* 2 * arch/sh/mm/cache-sh3.c 3 * 4 * Copyright (C) 1999, 2000 Niibe Yutaka 5 * Copyright (C) 2002 Paul Mundt 6 * 7 * Released under the terms of the GNU GPL v2.0. 8 */ 9 10 #include <linux/init.h> 11 #include <linux/mman.h> 12 #include <linux/mm.h> 13 #include <linux/threads.h> 14 #include <asm/addrspace.h> 15 #include <asm/page.h> 16 #include <asm/pgtable.h> 17 #include <asm/processor.h> 18 #include <asm/cache.h> 19 #include <asm/io.h> 20 #include <linux/uaccess.h> 21 #include <asm/pgalloc.h> 22 #include <asm/mmu_context.h> 23 #include <asm/cacheflush.h> 24 25 /* 26 * Write back the dirty D-caches, but not invalidate them. 27 * 28 * Is this really worth it, or should we just alias this routine 29 * to __flush_purge_region too? 30 * 31 * START: Virtual Address (U0, P1, or P3) 32 * SIZE: Size of the region. 33 */ 34 35 static void sh3__flush_wback_region(void *start, int size) 36 { 37 unsigned long v, j; 38 unsigned long begin, end; 39 unsigned long flags; 40 41 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 42 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 43 & ~(L1_CACHE_BYTES-1); 44 45 for (v = begin; v < end; v+=L1_CACHE_BYTES) { 46 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY; 47 for (j = 0; j < current_cpu_data.dcache.ways; j++) { 48 unsigned long data, addr, p; 49 50 p = __pa(v); 51 addr = addrstart | (v & current_cpu_data.dcache.entry_mask); 52 local_irq_save(flags); 53 data = __raw_readl(addr); 54 55 if ((data & CACHE_PHYSADDR_MASK) == 56 (p & CACHE_PHYSADDR_MASK)) { 57 data &= ~SH_CACHE_UPDATED; 58 __raw_writel(data, addr); 59 local_irq_restore(flags); 60 break; 61 } 62 local_irq_restore(flags); 63 addrstart += current_cpu_data.dcache.way_incr; 64 } 65 } 66 } 67 68 /* 69 * Write back the dirty D-caches and invalidate them. 70 * 71 * START: Virtual Address (U0, P1, or P3) 72 * SIZE: Size of the region. 73 */ 74 static void sh3__flush_purge_region(void *start, int size) 75 { 76 unsigned long v; 77 unsigned long begin, end; 78 79 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 80 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 81 & ~(L1_CACHE_BYTES-1); 82 83 for (v = begin; v < end; v+=L1_CACHE_BYTES) { 84 unsigned long data, addr; 85 86 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */ 87 addr = CACHE_OC_ADDRESS_ARRAY | 88 (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC; 89 __raw_writel(data, addr); 90 } 91 } 92 93 void __init sh3_cache_init(void) 94 { 95 __flush_wback_region = sh3__flush_wback_region; 96 __flush_purge_region = sh3__flush_purge_region; 97 98 /* 99 * No write back please 100 * 101 * Except I don't think there's any way to avoid the writeback. 102 * So we just alias it to sh3__flush_purge_region(). dwmw2. 103 */ 104 __flush_invalidate_region = sh3__flush_purge_region; 105 } 106