1/* 2 * Platform dependent support for IO probing. 3 * 4 * Copyright (c) 2000-2002 Silicon Graphics, Inc. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it would be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 13 * 14 * Further, this software is distributed without any warranty that it is 15 * free of the rightful claim of any third person regarding infringement 16 * or the like. Any license provided herein, whether implied or 17 * otherwise, applies only to this software file. Patent licenses, if 18 * any, provided herein do not apply to combinations of this program with 19 * other software, or any other product whatsoever. 20 * 21 * You should have received a copy of the GNU General Public 22 * License along with this program; if not, write the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. 24 * 25 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 26 * Mountain View, CA 94043, or: 27 * 28 * http://www.sgi.com 29 * 30 * For further information regarding this notice, see: 31 * 32 * http://oss.sgi.com/projects/GenInfo/NoticeExplan 33 */ 34 35#include <asm/sn/sn_sal.h> 36 37/** 38 * ia64_sn_probe_io_slot - test a memory location for readability 39 * @paddr: physical address to probe 40 * @size: number bytes to read (1,2,4,8) 41 * @data_ptr: address to store value read by probe (-1 returned if probe fails) 42 * 43 * This function will probe a physical address to determine if 44 * the address can be read. If reading the address causes a BUS 45 * error, an error is returned. If the probe succeeds, the contents 46 * of the memory location is returned. 47 * 48 * Return values: 49 * 0 - probe successful 50 * 1 - probe failed (generated MCA) 51 * 2 - Bad arg 52 * <0 - PAL error 53 */ 54u64 55ia64_sn_probe_io_slot(long paddr, long size, void *data_ptr) 56{ 57 struct ia64_sal_retval isrv; 58 59 SAL_CALL(isrv, SN_SAL_PROBE, paddr, size, 0, 0, 0, 0, 0); 60 61 if (data_ptr) { 62 switch (size) { 63 case 1: 64 *((u8*)data_ptr) = (u8)isrv.v0; 65 break; 66 case 2: 67 *((u16*)data_ptr) = (u16)isrv.v0; 68 break; 69 case 4: 70 *((u32*)data_ptr) = (u32)isrv.v0; 71 break; 72 case 8: 73 *((u64*)data_ptr) = (u64)isrv.v0; 74 break; 75 default: 76 isrv.status = 2; 77 } 78 } 79 80 return isrv.status; 81} 82