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