diff options
Diffstat (limited to 'src/dev/serial/simple.cc')
-rw-r--r-- | src/dev/serial/simple.cc | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/dev/serial/simple.cc b/src/dev/serial/simple.cc new file mode 100644 index 000000000..aea94f995 --- /dev/null +++ b/src/dev/serial/simple.cc @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2018 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#include "dev/serial/simple.hh" + +#include "mem/packet.hh" +#include "mem/packet_access.hh" +#include "params/SimpleUart.hh" +#include "sim/sim_exit.hh" + +SimpleUart::SimpleUart(const SimpleUartParams *p) + : Uart(p, p->pio_size), + byteOrder(p->big_endian ? BigEndianByteOrder : LittleEndianByteOrder), + endOnEOT(p->end_on_eot) +{ +} + +Tick +SimpleUart::read(PacketPtr pkt) +{ + assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); + + uint64_t data = 0; + + if (device->dataAvailable()) + data = device->readData(); + + pkt->setUintX(data, byteOrder); + + pkt->makeAtomicResponse(); + return pioDelay; +} + +Tick +SimpleUart::write(PacketPtr pkt) +{ + + assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); + + uint8_t data = (uint8_t)pkt->getUintX(byteOrder); + if (data == 0x04 && endOnEOT) + exitSimLoop("UART received EOT", 0); + + device->writeData(data); + + pkt->makeAtomicResponse(); + return pioDelay; +} + +SimpleUart * +SimpleUartParams::create() +{ + return new SimpleUart(this); +} |