1*c456cfc2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * arch/sh/mm/cache-sh3.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1999, 2000 Niibe Yutaka 61da177e4SLinus Torvalds * Copyright (C) 2002 Paul Mundt 71da177e4SLinus Torvalds */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/init.h> 101da177e4SLinus Torvalds #include <linux/mman.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 121da177e4SLinus Torvalds #include <linux/threads.h> 131da177e4SLinus Torvalds #include <asm/addrspace.h> 141da177e4SLinus Torvalds #include <asm/page.h> 151da177e4SLinus Torvalds #include <asm/pgtable.h> 161da177e4SLinus Torvalds #include <asm/processor.h> 171da177e4SLinus Torvalds #include <asm/cache.h> 181da177e4SLinus Torvalds #include <asm/io.h> 197c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 201da177e4SLinus Torvalds #include <asm/pgalloc.h> 211da177e4SLinus Torvalds #include <asm/mmu_context.h> 221da177e4SLinus Torvalds #include <asm/cacheflush.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds /* 251da177e4SLinus Torvalds * Write back the dirty D-caches, but not invalidate them. 261da177e4SLinus Torvalds * 271da177e4SLinus Torvalds * Is this really worth it, or should we just alias this routine 281da177e4SLinus Torvalds * to __flush_purge_region too? 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * START: Virtual Address (U0, P1, or P3) 311da177e4SLinus Torvalds * SIZE: Size of the region. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 3479f1c9daSPaul Mundt static void sh3__flush_wback_region(void *start, int size) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds unsigned long v, j; 371da177e4SLinus Torvalds unsigned long begin, end; 381da177e4SLinus Torvalds unsigned long flags; 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 411da177e4SLinus Torvalds end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 421da177e4SLinus Torvalds & ~(L1_CACHE_BYTES-1); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds for (v = begin; v < end; v+=L1_CACHE_BYTES) { 451da177e4SLinus Torvalds unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY; 4611c19656SPaul Mundt for (j = 0; j < current_cpu_data.dcache.ways; j++) { 471da177e4SLinus Torvalds unsigned long data, addr, p; 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds p = __pa(v); 5011c19656SPaul Mundt addr = addrstart | (v & current_cpu_data.dcache.entry_mask); 511da177e4SLinus Torvalds local_irq_save(flags); 529d56dd3bSPaul Mundt data = __raw_readl(addr); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds if ((data & CACHE_PHYSADDR_MASK) == 551da177e4SLinus Torvalds (p & CACHE_PHYSADDR_MASK)) { 561da177e4SLinus Torvalds data &= ~SH_CACHE_UPDATED; 579d56dd3bSPaul Mundt __raw_writel(data, addr); 581da177e4SLinus Torvalds local_irq_restore(flags); 591da177e4SLinus Torvalds break; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds local_irq_restore(flags); 6211c19656SPaul Mundt addrstart += current_cpu_data.dcache.way_incr; 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds /* 681da177e4SLinus Torvalds * Write back the dirty D-caches and invalidate them. 691da177e4SLinus Torvalds * 701da177e4SLinus Torvalds * START: Virtual Address (U0, P1, or P3) 711da177e4SLinus Torvalds * SIZE: Size of the region. 721da177e4SLinus Torvalds */ 7379f1c9daSPaul Mundt static void sh3__flush_purge_region(void *start, int size) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds unsigned long v; 761da177e4SLinus Torvalds unsigned long begin, end; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); 791da177e4SLinus Torvalds end = ((unsigned long)start + size + L1_CACHE_BYTES-1) 801da177e4SLinus Torvalds & ~(L1_CACHE_BYTES-1); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds for (v = begin; v < end; v+=L1_CACHE_BYTES) { 831da177e4SLinus Torvalds unsigned long data, addr; 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */ 861da177e4SLinus Torvalds addr = CACHE_OC_ADDRESS_ARRAY | 8711c19656SPaul Mundt (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC; 889d56dd3bSPaul Mundt __raw_writel(data, addr); 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 9279f1c9daSPaul Mundt void __init sh3_cache_init(void) 9379f1c9daSPaul Mundt { 9479f1c9daSPaul Mundt __flush_wback_region = sh3__flush_wback_region; 9579f1c9daSPaul Mundt __flush_purge_region = sh3__flush_purge_region; 9679f1c9daSPaul Mundt 971da177e4SLinus Torvalds /* 981da177e4SLinus Torvalds * No write back please 991da177e4SLinus Torvalds * 10079f1c9daSPaul Mundt * Except I don't think there's any way to avoid the writeback. 10179f1c9daSPaul Mundt * So we just alias it to sh3__flush_purge_region(). dwmw2. 1021da177e4SLinus Torvalds */ 10379f1c9daSPaul Mundt __flush_invalidate_region = sh3__flush_purge_region; 10479f1c9daSPaul Mundt } 105