1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * arch/sh/mm/cache-sh3.c 4 * 5 * Copyright (C) 1999, 2000 Niibe Yutaka 6 * Copyright (C) 2002 Paul Mundt 7 */ 8 9 #include <linux/init.h> 10 #include <linux/mman.h> 11 #include <linux/mm.h> 12 #include <linux/threads.h> 13 #include <asm/addrspace.h> 14 #include <asm/page.h> 15 #include <asm/pgtable.h> 16 #include <asm/processor.h> 17 #include <asm/cache.h> 18 #include <asm/io.h> 19 #include <linux/uaccess.h> 20 #include <asm/pgalloc.h> 21 #include <asm/mmu_context.h> 22 #include <asm/cacheflush.h> 23 24 /* 25 * Write back the dirty D-caches, but not invalidate them. 26 * 27 * Is this really worth it, or should we just alias this routine 28 * to __flush_purge_region too? 29 * 30 * START: Virtual Address (U0, P1, or P3) 31 * SIZE: Size of the region. 32 */ 33 34 static void sh3__flush_wback_region(void *start, int size) 35 { 36 unsigned long v, j; 37 unsigned long begin, end; 38 unsigned long flags; 39 40 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 41 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 42 & ~(L1_CACHE_BYTES-1); 43 44 for (v = begin; v < end; v+=L1_CACHE_BYTES) { 45 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY; 46 for (j = 0; j < current_cpu_data.dcache.ways; j++) { 47 unsigned long data, addr, p; 48 49 p = __pa(v); 50 addr = addrstart | (v & current_cpu_data.dcache.entry_mask); 51 local_irq_save(flags); 52 data = __raw_readl(addr); 53 54 if ((data & CACHE_PHYSADDR_MASK) == 55 (p & CACHE_PHYSADDR_MASK)) { 56 data &= ~SH_CACHE_UPDATED; 57 __raw_writel(data, addr); 58 local_irq_restore(flags); 59 break; 60 } 61 local_irq_restore(flags); 62 addrstart += current_cpu_data.dcache.way_incr; 63 } 64 } 65 } 66 67 /* 68 * Write back the dirty D-caches and invalidate them. 69 * 70 * START: Virtual Address (U0, P1, or P3) 71 * SIZE: Size of the region. 72 */ 73 static void sh3__flush_purge_region(void *start, int size) 74 { 75 unsigned long v; 76 unsigned long begin, end; 77 78 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 79 end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 80 & ~(L1_CACHE_BYTES-1); 81 82 for (v = begin; v < end; v+=L1_CACHE_BYTES) { 83 unsigned long data, addr; 84 85 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */ 86 addr = CACHE_OC_ADDRESS_ARRAY | 87 (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC; 88 __raw_writel(data, addr); 89 } 90 } 91 92 void __init sh3_cache_init(void) 93 { 94 __flush_wback_region = sh3__flush_wback_region; 95 __flush_purge_region = sh3__flush_purge_region; 96 97 /* 98 * No write back please 99 * 100 * Except I don't think there's any way to avoid the writeback. 101 * So we just alias it to sh3__flush_purge_region(). dwmw2. 102 */ 103 __flush_invalidate_region = sh3__flush_purge_region; 104 } 105