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Annotation of XNU/iokit/Drivers/platform/drvApplePMU/IOPMUNVRAMController.cpp, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  *  1 Dec 1998 suurballe  Created.
                     24:  */
                     25: 
                     26: #include <IOKit/IOSyncer.h>
                     27: #include "IOPMUNVRAMController.h"
                     28: #include "pmupriv.h"
                     29: 
                     30: #define super IONVRAMController
                     31: OSDefineMetaClassAndStructors(IOPMUNVRAMController, IONVRAMController)
                     32: 
                     33: 
                     34: // **********************************************************************************
                     35: // init
                     36: //
                     37: // **********************************************************************************
                     38: bool IOPMUNVRAMController::init ( OSDictionary * properties, ApplePMU * driver )
                     39: {
                     40:     PMUdriver = driver;
                     41: 
                     42:     return super::init(properties);
                     43: }
                     44: 
                     45: 
                     46: 
                     47: // **********************************************************************************
                     48: // openNVRAM
                     49: //
                     50: //
                     51: // **********************************************************************************
                     52: IOReturn IOPMUNVRAMController::openNVRAM ( void )
                     53: {
                     54:     return kPMUNoError;
                     55: }
                     56: 
                     57: 
                     58: // **********************************************************************************
                     59: // readNVRAM
                     60: //
                     61: // The NVRAM driver is calling to read part of the NVRAM.  We translate this into
                     62: // single-byte PMU commands and enqueue them to its command queue.
                     63: //
                     64: // **********************************************************************************
                     65: IOReturn IOPMUNVRAMController::readNVRAM ( UInt32 Offset, IOByteCount * Length, UInt8 * Buffer )
                     66: {
                     67: PMUrequest     request;
                     68: IOByteCount    i;
                     69: UInt8 *                client_buffer = Buffer;
                     70: UInt32         our_offset = Offset;
                     71: 
                     72: if ( (Buffer == NULL) ||
                     73:          (*Length == 0) ||
                     74:          (*Length > 8192) ||
                     75:          (Offset > 8192) ||
                     76:          ((*Length + Offset) > 8192) ) {
                     77:         return kPMUParameterError;
                     78: }
                     79: 
                     80: for ( i = 0; i < *Length ; i++ ) {
                     81:         request.sync = IOSyncer::create();
                     82:         request.pmCommand = kPMUNVRAMRead;
                     83:         request.pmFlag = false;
                     84:         request.pmSLength1 = 2;
                     85:         request.pmSBuffer2 = NULL;
                     86:         request.pmSLength2 = 0;
                     87:         request.pmRBuffer = client_buffer++;
                     88:         request.pmSBuffer1[0] = our_offset >> 8;
                     89:         request.pmSBuffer1[1] = our_offset++;
                     90: 
                     91:         PMUdriver->enqueueCommand(&request);
                     92:         request.sync->wait();                  // wait till done
                     93: }
                     94: 
                     95: return kPMUNoError;
                     96: }
                     97: 
                     98: 
                     99: // **********************************************************************************
                    100: // writeNVRAM
                    101: //
                    102: // The NVRAM driver is calling to write part of the NVRAM.  We translate this into
                    103: // single-byte PMU commands and enqueue them to our command queue.
                    104: //
                    105: // **********************************************************************************
                    106: IOReturn IOPMUNVRAMController::writeNVRAM ( UInt32 Offset, IOByteCount * Length, UInt8 * Buffer )
                    107: {
                    108: PMUrequest     request;
                    109: IOByteCount    i;
                    110: UInt32         our_offset = Offset;
                    111: UInt8 *                client_buffer = Buffer;
                    112: 
                    113: if ( (Buffer == NULL) ||
                    114:          (*Length == 0) ||
                    115:          (*Length > 8192) ||
                    116:          (Offset > 8192) ||
                    117:          ((*Length + Offset) > 8192) ) {
                    118:         return kPMUParameterError;
                    119: }
                    120: 
                    121: for ( i = 0; i < *Length ; i++ ) {
                    122:         request.sync = IOSyncer::create();
                    123:         request.pmCommand = kPMUNVRAMWrite;
                    124:         request.pmFlag = false;
                    125:         request.pmSLength1 = 3;
                    126:         request.pmSBuffer2 = NULL;
                    127:         request.pmSLength2 = 0;
                    128:         request.pmRBuffer = NULL;
                    129:         request.pmSBuffer1[0] = our_offset >> 8;
                    130:         request.pmSBuffer1[1] = our_offset++;
                    131:         request.pmSBuffer1[2] = *client_buffer++;
                    132: 
                    133:         PMUdriver->enqueueCommand(&request);
                    134:         request.sync->wait();                  // wait till done
                    135: }
                    136: 
                    137: return kPMUNoError;
                    138: }

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