/* $Id: DevEEPROM.cpp 24020 2009-10-23 11:03:34Z vboxsync $ */ /** @file * DevEEPROM - Microware-compatible 64x16-bit 93C46 EEPROM Emulation. */ /* * Copyright (C) 2007 Sun Microsystems, Inc. * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ #define LOG_GROUP LOG_GROUP_DEV_E1000 /// @todo Add a EEPROM logging group. #include #include #include #include "DevEEPROM.h" #define E1kLog(a) Log(a) /** * Initialize EEPROM device. * * @param pu16Initial Initial EEPROM content (optional). The size of initial * content must be sizeof(uint16_t)*EEPROM93C46::SIZE * bytes. */ void EEPROM93C46::init(const uint16_t *pu16Initial) { if ( pu16Initial ) { memcpy(this->m_au16Data, pu16Initial, sizeof(this->m_au16Data)); } else { memset(this->m_au16Data, 0, sizeof(this->m_au16Data)); } m_fWriteEnabled = false; m_u32InternalWires = 0; m_eState = STANDBY; } /** * Writes one word to specified location if write is enabled. * * @param u32Addr Address to write at * @param u16Value Value to store */ void EEPROM93C46::storeWord(uint32_t u32Addr, uint16_t u16Value) { if (m_fWriteEnabled) { E1kLog(("EEPROM: Stored word %04x at %08x\n", u16Value, u32Addr)); m_au16Data[u32Addr] = u16Value; } m_u16Mask = DATA_MSB; } /** * Fetch next word pointer by m_u16Addr. * * m_u16Addr is advanced and mask is reset to support sequential reads. * * @returns New state */ EEPROM93C46::State EEPROM93C46::opRead() { m_u16Word = m_au16Data[m_u16Addr++]; E1kLog(("EEPROM: Reading word %04x at %08x\n", m_u16Word, m_u16Addr-1)); m_u16Mask = DATA_MSB; return WRITING_DO; } /** * Write the value of m_u16Word to the location specified by m_u16Addr. * * @returns New state * * @remarks Need to wait for CS lower/raise to show busy/ready indication. */ EEPROM93C46::State EEPROM93C46::opWrite() { storeWord(m_u16Addr, m_u16Word); return WAITING_CS_FALL; } /** * Overwrite the entire contents of EEPROM with the value of m_u16Word. * * @returns New state * * @remarks Need to wait for CS lower/raise to show busy/ready indication. */ EEPROM93C46::State EEPROM93C46::opWriteAll() { for (int i = 0; i < SIZE; i++) storeWord(i, m_u16Word); return WAITING_CS_FALL; } /** * Decode opcode and address from 'opAddr' member. * * Decodes operation and executes it immediately if possible; otherwise, stores * the decoded operation and address. * * @returns New state */ EEPROM93C46::State EEPROM93C46::opDecode() { switch (m_u16Word>>6) { case 3: /* ERASE */ storeWord(m_u16Word & ADDR_MASK, 0xFFFF); return WAITING_CS_FALL; case 2: /* READ */ m_eOp = OP_READ; m_u16Addr = m_u16Word & ADDR_MASK; return opRead(); /* Load first word */ case 1: /* WRITE */ m_eOp = OP_WRITE; m_u16Addr = m_u16Word & ADDR_MASK; m_u16Word = 0; m_u16Mask = DATA_MSB; return READING_DI; case 0: switch (m_u16Word>>4) { case 0: /* ERASE/WRITE DISABLE */ m_fWriteEnabled = false; return STANDBY; case 1: /* WRITE ALL */ m_eOp = OP_WRITE_ALL; m_u16Word = 0; m_u16Mask = DATA_MSB; return READING_DI; case 2: /* ERASE ALL */ /* Re-use opWriteAll */ m_u16Word = 0xFFFF; return opWriteAll(); case 3: /* ERASE/WRITE ENABLE */ m_fWriteEnabled = true; return STANDBY; } } return m_eState; } /** * Set bits in EEPROM 4-wire interface. * * @param u32Wires Values of DI, CS, SK. * @remarks The value of DO bit in 'u32Wires' is ignored. */ void EEPROM93C46::write(uint32_t u32Wires) { if (u32Wires & WIRES_CS) { if (!(m_u32InternalWires & WIRES_SK) && (u32Wires & WIRES_SK)) { /* Positive edge of clock */ if (m_eState == STANDBY) { if (u32Wires & WIRES_DI) { m_eState = READING_DI; m_eOp = OP_DECODE; m_u16Mask = OPADDR_MSB; m_u16Word = 0; } } else { if (m_eState == READING_DI) { if (u32Wires & WIRES_DI) { m_u16Word |= m_u16Mask; } } else if (m_eState == WRITING_DO) { m_u32InternalWires &= ~WIRES_DO; if (m_u16Word & m_u16Mask) { m_u32InternalWires |= WIRES_DO; } } else return; /* Next bit */ m_u16Mask >>= 1; if (m_u16Mask == 0) { switch (this->m_eOp) { case OP_READ: m_eState = opRead(); break; case OP_WRITE: m_eState = opWrite(); break; case OP_WRITE_ALL: m_eState = opWriteAll(); break; case OP_DECODE: m_eState = opDecode(); break; default: ; } } } } else if (m_eState == WAITING_CS_RISE) { m_u32InternalWires |= WIRES_DO; /* ready */ m_eState = STANDBY; } } else { switch(m_eState) { case WAITING_CS_FALL: m_eState = WAITING_CS_RISE; m_u32InternalWires &= ~WIRES_DO; /* busy */ break; case WAITING_CS_RISE: break; case READING_DI: m_u32InternalWires &= ~WIRES_DO; /* Clear ready/busy status from DO. */ /* Fall through! */ default: m_eState = STANDBY; break; } } m_u32InternalWires &= WIRES_DO; m_u32InternalWires |= u32Wires & ~WIRES_DO; /* Do not overwrite DO */ } /** * Read bits in EEPROM 4-wire interface. * * @returns Current values of DO, DI, CS, SK. * * @remarks Only DO is controlled by EEPROM, other bits are returned as they * were written by 'write'. */ uint32_t EEPROM93C46::read() { return m_u32InternalWires; } void EEPROM93C46::save(PSSMHANDLE pSSM) { SSMR3PutU8( pSSM, EEPROM93C46_SAVEDSTATE_VERSION); SSMR3PutU8( pSSM, m_eState); SSMR3PutU8( pSSM, m_eOp); SSMR3PutBool(pSSM, m_fWriteEnabled); SSMR3PutU32( pSSM, m_u32InternalWires); SSMR3PutU16( pSSM, m_u16Word); SSMR3PutU16( pSSM, m_u16Mask); SSMR3PutU16( pSSM, m_u16Addr); SSMR3PutMem( pSSM, m_au16Data, sizeof(m_au16Data)); } int EEPROM93C46::load(PSSMHANDLE pSSM) { int rc = VINF_SUCCESS; uint8_t uVersion = 0; rc = SSMR3GetU8(pSSM, &uVersion); AssertRCReturn(rc, rc); if (uVersion != EEPROM93C46_SAVEDSTATE_VERSION) return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION; rc = SSMR3GetU8( pSSM, (uint8_t*)&m_eState); AssertRCReturn(rc, rc); rc = SSMR3GetU8( pSSM, (uint8_t*)&m_eOp); AssertRCReturn(rc, rc); rc = SSMR3GetBool(pSSM, &m_fWriteEnabled); AssertRCReturn(rc, rc); rc = SSMR3GetU32( pSSM, &m_u32InternalWires); AssertRCReturn(rc, rc); rc = SSMR3GetU16( pSSM, &m_u16Word); AssertRCReturn(rc, rc); rc = SSMR3GetU16( pSSM, &m_u16Mask); AssertRCReturn(rc, rc); rc = SSMR3GetU16( pSSM, &m_u16Addr); AssertRCReturn(rc, rc); rc = SSMR3GetMem( pSSM, m_au16Data, sizeof(m_au16Data)); return rc; }