1 /* $NetBSD: footbridge_machdep.c,v 1.3 2001/07/28 18:12:44 chris Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Mark Brinicombe. 5 * Copyright (c) 1997 Causality Limited 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Mark Brinicombe 19 * for the NetBSD Project. 20 * 4. The name of the company nor the name of the author may be used to 21 * endorse or promote products derived from this software without specific 22 * prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <uvm/uvm_extern.h> 40 #include <machine/pmap.h> 41 #include <machine/pte.h> 42 #include <arm/footbridge/dc21285mem.h> 43 44 extern pt_entry_t *pmap_pte __P((pmap_t pmap, vm_offset_t va)); 45 46 /* 47 * For optimal cache cleaning we need two 16K banks of 48 * virtual address space that NOTHING else will access 49 * and then we alternate the cache cleaning between the 50 * two banks. 51 * The cache cleaning code requires requires 2 banks aligned 52 * on total size boundry so the banks can be alternated by 53 * eorring the size bit (assumes the bank size is a power of 2) 54 * 55 * On the DC21285 we have a special cache clean area so we will 56 * use it. 57 */ 58 59 extern unsigned int sa110_cache_clean_addr; 60 extern unsigned int sa110_cache_clean_size; 61 62 #if 0 63 void 64 footbridge_sa110_cc_setup(void) 65 { 66 vm_offset_t vaddr; 67 vm_offset_t addr; 68 int cleanarea; 69 int loop; 70 pt_entry_t *pte; 71 72 cleanarea = (NBPG * 4) * 2; 73 vaddr = uvm_km_valloc(kernel_map, cleanarea + (NBPG * 4)); 74 addr = (vaddr + (cleanarea - 1)) & ~(cleanarea - 1); 75 76 /* printf("vaddr=%x addr=%x\n", vaddr, addr);*/ 77 78 for (loop = 0; loop < cleanarea; loop += NBPG) { 79 pte = pmap_pte(pmap_kernel(), (addr + loop)); 80 *pte = L2_PTE(DC21285_SA_CACHE_FLUSH_BASE + loop, AP_KR); 81 } 82 sa110_cache_clean_addr = addr; 83 sa110_cache_clean_size = cleanarea / 2; 84 } 85 #else 86 void 87 footbridge_sa110_cc_setup(void) 88 { 89 sa110_cache_clean_addr = DC21285_CACHE_FLUSH_VBASE; 90 sa110_cache_clean_size = (NBPG * 4); 91 } 92 #endif 93