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/* $Id$ */
/* @file
* Tsunami UART
*/
/*
* Copyright (C) 1998 by the Board of Trustees
* of Leland Stanford Junior University.
* Copyright (C) 1998 Digital Equipment Corporation
*
* This file is part of the SimOS distribution.
* See LICENSE file for terms of the license.
*
*/
#include <string>
#include <vector>
#include "base/inifile.hh"
#include "base/str.hh" // for to_number
#include "base/trace.hh"
#include "dev/console.hh"
#include "dev/tsunami_uart.hh"
#include "mem/functional_mem/memory_control.hh"
#include "sim/builder.hh"
#include "targetarch/ev5.hh"
using namespace std;
#define CONS_INT_TX 0x01 // interrupt enable / state bits
#define CONS_INT_RX 0x02
TsunamiUart::TsunamiUart(const string &name, SimConsole *c, Addr a,
MemoryController *mmu)
: FunctionalMemory(name), addr(a), cons(c), status_store(0),
valid_char(false)
{
mmu->add_child(this, Range<Addr>(addr, addr + size));
IER = 0;
}
Fault
TsunamiUart::read(MemReqPtr &req, uint8_t *data)
{
Addr daddr = req->paddr - (addr & PA_IMPL_MASK);
DPRINTF(TsunamiUart, " read register %#x\n", daddr);
switch (req->size) {
case sizeof(uint64_t):
*(uint64_t *)data = 0;
break;
case sizeof(uint32_t):
*(uint32_t *)data = 0;
break;
case sizeof(uint16_t):
*(uint16_t *)data = 0;
break;
case sizeof(uint8_t):
*(uint8_t *)data = 0;
break;
}
switch (daddr) {
case 0x5: // Status Register
{
int status = cons->intStatus();
if (!valid_char) {
valid_char = cons->in(next_char);
if (!valid_char)
status &= ~CONS_INT_RX;
} else {
status |= CONS_INT_RX;
}
if (status_store == 3) {
// RR3 stuff? Don't really understand it, btw
status_store = 0;
if (status & CONS_INT_TX) {
*data = (1 << 4);
return No_Fault;
} else if (status & CONS_INT_RX) {
*data = (1 << 5);
return No_Fault;
} else {
DPRINTF(TsunamiUart, "spurious read\n");
return No_Fault;
}
} else {
int reg = (1 << 2) | (1 << 5) | (1 << 6);
if (status & CONS_INT_RX)
reg |= (1 << 0);
*data = reg;
return No_Fault;
}
break;
}
case 0x0: // Data register (RX)
// if (!valid_char)
// panic("Invalid character");
DPRINTF(TsunamiUart, "read data register \'%c\' %#02x\n",
isprint(next_char) ? next_char : ' ', next_char);
*data = next_char;
valid_char = false;
return No_Fault;
case 0x1: // Interrupt Enable Register
// This is the lovely way linux checks there is actually a serial
// port at the desired address
if (IER == 0)
*data = 0;
else if (IER == 0x0F)
*data = 0x0F;
else
*data = 0;
return No_Fault;
case 0x2:
*data = 0; // This means a 8250 serial port, do we want a 16550?
return No_Fault;
}
*data = 0;
// panic("%s: read daddr=%#x type=read *data=%#x\n", name(), daddr, *data);
return No_Fault;
}
Fault
TsunamiUart::write(MemReqPtr &req, const uint8_t *data)
{
Addr daddr = req->paddr - (addr & PA_IMPL_MASK);
DPRINTF(TsunamiUart, " write register %#x value %#x\n", daddr, *(uint8_t*)data);
switch (daddr) {
case 0x3:
status_store = *data;
switch (*data) {
case 0x03: // going to read RR3
return No_Fault;
case 0x28: // Ack of TX
{
if ((cons->intStatus() & CONS_INT_TX) == 0)
panic("Ack of transmit, though there was no interrupt");
cons->clearInt(CONS_INT_TX);
return No_Fault;
}
case 0x00:
case 0x01:
case 0x12:
// going to write data???
return No_Fault;
default:
DPRINTF(TsunamiUart, "writing status register %#x \n",
*(uint8_t *)data);
return No_Fault;
}
case 0x0: // Data register (TX)
cons->out(*(uint64_t *)data);
return No_Fault;
case 0x1: // DLM
DPRINTF(TsunamiUart, "writing to DLM/IER %#x\n", *(uint8_t*)data);
IER = *(uint8_t*)data;
return No_Fault;
case 0x4: // MCR
DPRINTF(TsunamiUart, "writing to MCR %#x\n", *(uint8_t*)data);
return No_Fault;
}
return No_Fault;
}
void
TsunamiUart::serialize(ostream &os)
{
SERIALIZE_SCALAR(status_store);
SERIALIZE_SCALAR(next_char);
SERIALIZE_SCALAR(valid_char);
SERIALIZE_SCALAR(IER);
}
void
TsunamiUart::unserialize(Checkpoint *cp, const std::string §ion)
{
UNSERIALIZE_SCALAR(status_store);
UNSERIALIZE_SCALAR(next_char);
UNSERIALIZE_SCALAR(valid_char);
UNSERIALIZE_SCALAR(IER);
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(TsunamiUart)
SimObjectParam<SimConsole *> console;
SimObjectParam<MemoryController *> mmu;
Param<Addr> addr;
END_DECLARE_SIM_OBJECT_PARAMS(TsunamiUart)
BEGIN_INIT_SIM_OBJECT_PARAMS(TsunamiUart)
INIT_PARAM(console, "The console"),
INIT_PARAM(mmu, "Memory Controller"),
INIT_PARAM(addr, "Device Address")
END_INIT_SIM_OBJECT_PARAMS(TsunamiUart)
CREATE_SIM_OBJECT(TsunamiUart)
{
return new TsunamiUart(getInstanceName(), console, addr, mmu);
}
REGISTER_SIM_OBJECT("TsunamiUart", TsunamiUart)
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