gem5/dev/uart8250.cc

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/*
Many files: Update copyright dates and author list SConscript: arch/alpha/alpha_linux_process.cc: arch/alpha/alpha_linux_process.hh: arch/alpha/alpha_memory.cc: arch/alpha/alpha_memory.hh: arch/alpha/alpha_tru64_process.cc: arch/alpha/alpha_tru64_process.hh: arch/alpha/aout_machdep.h: arch/alpha/arguments.cc: arch/alpha/arguments.hh: arch/alpha/ev5.cc: arch/alpha/ev5.hh: arch/alpha/faults.cc: arch/alpha/faults.hh: arch/alpha/isa_desc: arch/alpha/isa_traits.hh: arch/alpha/osfpal.cc: arch/alpha/osfpal.hh: arch/alpha/pseudo_inst.cc: arch/alpha/pseudo_inst.hh: arch/alpha/vptr.hh: arch/alpha/vtophys.cc: arch/alpha/vtophys.hh: base/bitfield.hh: base/callback.hh: base/circlebuf.cc: base/circlebuf.hh: base/cprintf.cc: base/cprintf.hh: base/cprintf_formats.hh: base/crc.hh: base/date.cc: base/dbl_list.hh: base/endian.hh: base/fast_alloc.cc: base/fast_alloc.hh: base/fifo_buffer.cc: base/fifo_buffer.hh: base/hashmap.hh: base/hostinfo.cc: base/hostinfo.hh: base/hybrid_pred.cc: base/hybrid_pred.hh: base/inet.cc: base/inet.hh: base/inifile.cc: base/inifile.hh: base/intmath.cc: base/intmath.hh: base/match.cc: base/match.hh: base/misc.cc: base/misc.hh: base/mod_num.hh: base/mysql.cc: base/mysql.hh: base/output.cc: base/output.hh: base/pollevent.cc: base/pollevent.hh: base/predictor.hh: base/random.cc: base/random.hh: base/range.cc: base/range.hh: base/refcnt.hh: base/remote_gdb.cc: base/remote_gdb.hh: base/res_list.hh: base/sat_counter.cc: base/sat_counter.hh: base/sched_list.hh: base/socket.cc: base/socket.hh: base/statistics.cc: base/statistics.hh: base/compression/lzss_compression.cc: base/compression/lzss_compression.hh: base/compression/null_compression.hh: base/loader/aout_object.cc: base/loader/aout_object.hh: base/loader/ecoff_object.cc: base/loader/ecoff_object.hh: base/loader/elf_object.cc: base/loader/elf_object.hh: base/loader/object_file.cc: base/loader/object_file.hh: base/loader/symtab.cc: base/loader/symtab.hh: base/stats/events.cc: base/stats/events.hh: base/stats/flags.hh: base/stats/mysql.cc: base/stats/mysql.hh: base/stats/mysql_run.hh: base/stats/output.hh: base/stats/statdb.cc: base/stats/statdb.hh: base/stats/text.cc: base/stats/text.hh: base/stats/types.hh: base/stats/visit.cc: base/stats/visit.hh: base/str.cc: base/str.hh: base/time.cc: base/time.hh: base/timebuf.hh: base/trace.cc: base/trace.hh: base/userinfo.cc: base/userinfo.hh: build/SConstruct: cpu/base.cc: cpu/base.hh: cpu/base_dyn_inst.cc: cpu/base_dyn_inst.hh: cpu/exec_context.cc: cpu/exec_context.hh: cpu/exetrace.cc: cpu/exetrace.hh: cpu/inst_seq.hh: cpu/intr_control.cc: cpu/intr_control.hh: cpu/memtest/memtest.cc: cpu/pc_event.cc: cpu/pc_event.hh: cpu/smt.hh: cpu/static_inst.cc: cpu/static_inst.hh: cpu/memtest/memtest.hh: cpu/o3/sat_counter.cc: cpu/o3/sat_counter.hh: cpu/ozone/cpu.hh: cpu/simple/cpu.cc: cpu/simple/cpu.hh: cpu/trace/opt_cpu.cc: cpu/trace/opt_cpu.hh: cpu/trace/reader/ibm_reader.cc: cpu/trace/reader/ibm_reader.hh: cpu/trace/reader/itx_reader.cc: cpu/trace/reader/itx_reader.hh: cpu/trace/reader/m5_reader.cc: cpu/trace/reader/m5_reader.hh: cpu/trace/reader/mem_trace_reader.cc: cpu/trace/reader/mem_trace_reader.hh: cpu/trace/trace_cpu.cc: cpu/trace/trace_cpu.hh: dev/alpha_access.h: dev/alpha_console.cc: dev/alpha_console.hh: dev/baddev.cc: dev/baddev.hh: dev/disk_image.cc: dev/disk_image.hh: dev/etherbus.cc: dev/etherbus.hh: dev/etherdump.cc: dev/etherdump.hh: dev/etherint.cc: dev/etherint.hh: dev/etherlink.cc: dev/etherlink.hh: dev/etherpkt.cc: dev/etherpkt.hh: dev/ethertap.cc: dev/ethertap.hh: dev/ide_ctrl.cc: dev/ide_ctrl.hh: dev/ide_disk.cc: dev/ide_disk.hh: dev/io_device.cc: dev/io_device.hh: dev/ns_gige.cc: dev/ns_gige.hh: dev/ns_gige_reg.h: dev/pciconfigall.cc: dev/pciconfigall.hh: dev/pcidev.cc: dev/pcidev.hh: dev/pcireg.h: dev/pktfifo.cc: dev/pktfifo.hh: dev/platform.cc: dev/platform.hh: dev/simconsole.cc: dev/simconsole.hh: dev/simple_disk.cc: dev/simple_disk.hh: dev/sinic.cc: dev/sinic.hh: dev/sinicreg.hh: dev/tsunami.cc: dev/tsunami.hh: dev/tsunami_cchip.cc: dev/tsunami_cchip.hh: dev/tsunami_io.cc: dev/tsunami_io.hh: dev/tsunami_pchip.cc: dev/tsunami_pchip.hh: dev/tsunamireg.h: dev/uart.cc: dev/uart.hh: dev/uart8250.cc: dev/uart8250.hh: docs/stl.hh: encumbered/cpu/full/op_class.hh: kern/kernel_stats.cc: kern/kernel_stats.hh: kern/linux/linux.hh: kern/linux/linux_syscalls.cc: kern/linux/linux_syscalls.hh: kern/linux/linux_system.cc: kern/linux/linux_system.hh: kern/linux/linux_threadinfo.hh: kern/linux/printk.cc: kern/linux/printk.hh: kern/system_events.cc: kern/system_events.hh: kern/tru64/dump_mbuf.cc: kern/tru64/dump_mbuf.hh: kern/tru64/mbuf.hh: kern/tru64/printf.cc: kern/tru64/printf.hh: kern/tru64/tru64.hh: kern/tru64/tru64_events.cc: kern/tru64/tru64_events.hh: kern/tru64/tru64_syscalls.cc: kern/tru64/tru64_syscalls.hh: kern/tru64/tru64_system.cc: kern/tru64/tru64_system.hh: python/SConscript: python/m5/__init__.py: python/m5/config.py: python/m5/convert.py: python/m5/multidict.py: python/m5/smartdict.py: sim/async.hh: sim/builder.cc: sim/builder.hh: sim/debug.cc: sim/debug.hh: sim/eventq.cc: sim/eventq.hh: sim/host.hh: sim/main.cc: sim/param.cc: sim/param.hh: sim/process.cc: sim/process.hh: sim/root.cc: sim/serialize.cc: sim/serialize.hh: sim/sim_events.cc: sim/sim_events.hh: sim/sim_exit.hh: sim/sim_object.cc: sim/sim_object.hh: sim/startup.cc: sim/startup.hh: sim/stat_control.cc: sim/stat_control.hh: sim/stats.hh: sim/syscall_emul.cc: sim/syscall_emul.hh: sim/system.cc: sim/system.hh: test/bitvectest.cc: test/circletest.cc: test/cprintftest.cc: test/genini.py: test/initest.cc: test/lru_test.cc: test/nmtest.cc: test/offtest.cc: test/paramtest.cc: test/rangetest.cc: test/sized_test.cc: test/stattest.cc: test/strnumtest.cc: test/symtest.cc: test/tokentest.cc: test/tracetest.cc: util/ccdrv/devtime.c: util/m5/m5.c: util/oprofile-top.py: util/rundiff: util/m5/m5op.h: util/m5/m5op.s: util/stats/db.py: util/stats/dbinit.py: util/stats/display.py: util/stats/info.py: util/stats/print.py: util/stats/stats.py: util/tap/tap.cc: Update copyright dates and author list --HG-- extra : convert_revision : 0faba08fc0fc0146f1efb7f61e4b043c020ff9e4
2005-06-05 11:16:00 +02:00
* Copyright (c) 2005 The Regents of The University of Michigan
* All rights reserved.
*
* 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.
*/
/** @file
* Implements a 8250 UART
*/
#include <string>
#include <vector>
#include "base/inifile.hh"
#include "base/str.hh" // for to_number
#include "base/trace.hh"
#include "dev/simconsole.hh"
#include "dev/uart8250.hh"
#include "dev/platform.hh"
#include "mem/bus/bus.hh"
#include "mem/bus/pio_interface.hh"
#include "mem/bus/pio_interface_impl.hh"
#include "mem/functional/memory_control.hh"
#include "sim/builder.hh"
using namespace std;
Uart8250::IntrEvent::IntrEvent(Uart8250 *u, int bit)
: Event(&mainEventQueue), uart(u)
{
DPRINTF(Uart, "UART Interrupt Event Initilizing\n");
intrBit = bit;
}
const char *
Uart8250::IntrEvent::description()
{
return "uart interrupt delay event";
}
void
Uart8250::IntrEvent::process()
{
if (intrBit & uart->IER) {
DPRINTF(Uart, "UART InterEvent, interrupting\n");
uart->platform->postConsoleInt();
uart->status |= intrBit;
}
else
DPRINTF(Uart, "UART InterEvent, not interrupting\n");
}
/* The linux serial driver (8250.c about line 1182) loops reading from
* the device until the device reports it has no more data to
* read. After a maximum of 255 iterations the code prints "serial8250
* too much work for irq X," and breaks out of the loop. Since the
* simulated system is so much slower than the actual system, if a
* user is typing on the keyboard it is very easy for them to provide
* input at a fast enough rate to not allow the loop to exit and thus
* the error to be printed. This magic number provides a delay between
* the time the UART receives a character to send to the simulated
* system and the time it actually notifies the system it has a
* character to send to alleviate this problem. --Ali
*/
void
Uart8250::IntrEvent::scheduleIntr()
{
static const Tick interval = (Tick)((Clock::Float::s / 2e9) * 450);
DPRINTF(Uart, "Scheduling IER interrupt for %#x, at cycle %lld\n", intrBit,
curTick + interval);
if (!scheduled())
schedule(curTick + interval);
else
reschedule(curTick + interval);
}
Uart8250::Uart8250(const string &name, SimConsole *c, MemoryController *mmu,
Addr a, Addr s, HierParams *hier, Bus *pio_bus,
Tick pio_latency, Platform *p)
: Uart(name, c, mmu, a, s, hier, pio_bus, pio_latency, p),
txIntrEvent(this, TX_INT), rxIntrEvent(this, RX_INT)
{
IER = 0;
DLAB = 0;
LCR = 0;
MCR = 0;
}
Fault
Uart8250::read(MemReqPtr &req, uint8_t *data)
{
Addr daddr = req->paddr - (addr & EV5::PAddrImplMask);
DPRINTF(Uart, " read register %#x\n", daddr);
assert(req->size == 1);
switch (daddr) {
case 0x0:
if (!(LCR & 0x80)) { // read byte
if (cons->dataAvailable())
cons->in(*data);
else {
*(uint8_t*)data = 0;
// A limited amount of these are ok.
DPRINTF(Uart, "empty read of RX register\n");
}
status &= ~RX_INT;
platform->clearConsoleInt();
if (cons->dataAvailable() && (IER & UART_IER_RDI))
rxIntrEvent.scheduleIntr();
} else { // dll divisor latch
;
}
break;
case 0x1:
if (!(LCR & 0x80)) { // Intr Enable Register(IER)
*(uint8_t*)data = IER;
} else { // DLM divisor latch MSB
;
}
break;
case 0x2: // Intr Identification Register (IIR)
DPRINTF(Uart, "IIR Read, status = %#x\n", (uint32_t)status);
Changes for getting FreeBSD to run. SConscript: Added more files to compile: dev/pcifake.cc, dev/isa_fake.cc, kern/freebsd/freebsd_system.cc, kern/freebsd/freebsd_events.cc. arch/alpha/isa_traits.hh: Added constant for argument register 2 as it is needed by FreebsdSystem::doCalibrateClocks(). cpu/exec_context.hh: cpu/o3/alpha_cpu.hh: Replaced htoa()s with gtoh() and htog(). cpu/o3/fetch_impl.hh: cpu/simple/cpu.cc: Replaced htoa() with gtoh(). dev/disk_image.cc: Replaced htoa()s with letoh()s. dev/ide_ctrl.cc: Got rid of magic numbers. Added IdeChannel and IdeRegType type names where necessary. dev/ide_ctrl.hh: Got rid of unnecessary macros. Changed RegType_t to IdeRegType. Changed bmi_regs to allow accessing registers by name instead of just by array index. Added IdeChannel enum type to use in place of bool variables which were used to specify IDE channel. dev/ide_disk.cc: Rewrote IdeDisk::read and IdeDisk::write functions to specify registers by name instead of indexing through an array. dev/ide_disk.hh: Updated command register struct. dev/ns_gige.cc: dev/ns_gige.hh: Made ReadConfig and WriteConfig begin with a lower-case letter. writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pciconfigall.cc: writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pcidev.cc: Cleaned up readConfig() and writeConfig() functions. dev/pcidev.hh: Added macros to make code that works with the BARs (base adress registers) more readable. writeConfig() now takes a pointer to data. dev/pcireg.h: Changed PCIConfig struct to make accessing elements more straight forward. Removed type 1 (for PCI-to-PCI bridges) PCI configuration space struct since it is not used. dev/rtcreg.h: Added macros for bit fields in RTC status registers A & B. dev/sinic.cc: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. The accessing of elements of PCIConfig structure is updated. dev/sinic.hh: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. dev/tsunami_io.cc: Added implementation of new RTC and PIT classes. dev/tsunami_io.hh: Added classes for RTC and PIT modules. dev/tsunamireg.h: Added macros for DMA ports used by Tsunami-Tru64. dev/uart8250.cc: Got rid of a magic number. Transmit (Tx) interrupts should clear upon a read of the Interrupt ID register. dev/uart8250.hh: Added comments and macros dealing with the UART Interrupt ID register. kern/linux/linux_system.cc: Replaced htoa() with htog(). python/m5/objects/Pci.py: PciFake is a python class for Pci Devices that do nothing. python/m5/objects/Tsunami.py: TsunamiFake was renamed as IsaFake. sim/system.cc: Replaced htoa()s with htog()s. dev/isa_fake.cc: New BitKeeper file ``dev/isa_fake.cc'' TsunamiFake was renamed as IsaFake. dev/isa_fake.hh: New BitKeeper file ``dev/isa_fake.hh'' TsunmaiFake was renamed as IsaFake. dev/pitreg.h: New BitKeeper file ``dev/pitreg.h'' Useful macros for working with PIT (Periodic Interval Timer) registers. --HG-- extra : convert_revision : 33f3a8a1034af4f6c71b32dd743e371c8613e780
2005-08-15 22:59:58 +02:00
if (status & RX_INT) /* Rx data interrupt has a higher priority */
Changes for getting FreeBSD to run. SConscript: Added more files to compile: dev/pcifake.cc, dev/isa_fake.cc, kern/freebsd/freebsd_system.cc, kern/freebsd/freebsd_events.cc. arch/alpha/isa_traits.hh: Added constant for argument register 2 as it is needed by FreebsdSystem::doCalibrateClocks(). cpu/exec_context.hh: cpu/o3/alpha_cpu.hh: Replaced htoa()s with gtoh() and htog(). cpu/o3/fetch_impl.hh: cpu/simple/cpu.cc: Replaced htoa() with gtoh(). dev/disk_image.cc: Replaced htoa()s with letoh()s. dev/ide_ctrl.cc: Got rid of magic numbers. Added IdeChannel and IdeRegType type names where necessary. dev/ide_ctrl.hh: Got rid of unnecessary macros. Changed RegType_t to IdeRegType. Changed bmi_regs to allow accessing registers by name instead of just by array index. Added IdeChannel enum type to use in place of bool variables which were used to specify IDE channel. dev/ide_disk.cc: Rewrote IdeDisk::read and IdeDisk::write functions to specify registers by name instead of indexing through an array. dev/ide_disk.hh: Updated command register struct. dev/ns_gige.cc: dev/ns_gige.hh: Made ReadConfig and WriteConfig begin with a lower-case letter. writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pciconfigall.cc: writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pcidev.cc: Cleaned up readConfig() and writeConfig() functions. dev/pcidev.hh: Added macros to make code that works with the BARs (base adress registers) more readable. writeConfig() now takes a pointer to data. dev/pcireg.h: Changed PCIConfig struct to make accessing elements more straight forward. Removed type 1 (for PCI-to-PCI bridges) PCI configuration space struct since it is not used. dev/rtcreg.h: Added macros for bit fields in RTC status registers A & B. dev/sinic.cc: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. The accessing of elements of PCIConfig structure is updated. dev/sinic.hh: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. dev/tsunami_io.cc: Added implementation of new RTC and PIT classes. dev/tsunami_io.hh: Added classes for RTC and PIT modules. dev/tsunamireg.h: Added macros for DMA ports used by Tsunami-Tru64. dev/uart8250.cc: Got rid of a magic number. Transmit (Tx) interrupts should clear upon a read of the Interrupt ID register. dev/uart8250.hh: Added comments and macros dealing with the UART Interrupt ID register. kern/linux/linux_system.cc: Replaced htoa() with htog(). python/m5/objects/Pci.py: PciFake is a python class for Pci Devices that do nothing. python/m5/objects/Tsunami.py: TsunamiFake was renamed as IsaFake. sim/system.cc: Replaced htoa()s with htog()s. dev/isa_fake.cc: New BitKeeper file ``dev/isa_fake.cc'' TsunamiFake was renamed as IsaFake. dev/isa_fake.hh: New BitKeeper file ``dev/isa_fake.hh'' TsunmaiFake was renamed as IsaFake. dev/pitreg.h: New BitKeeper file ``dev/pitreg.h'' Useful macros for working with PIT (Periodic Interval Timer) registers. --HG-- extra : convert_revision : 33f3a8a1034af4f6c71b32dd743e371c8613e780
2005-08-15 22:59:58 +02:00
*(uint8_t*)data = IIR_RXID;
else if (status & TX_INT)
*(uint8_t*)data = IIR_TXID;
else
Changes for getting FreeBSD to run. SConscript: Added more files to compile: dev/pcifake.cc, dev/isa_fake.cc, kern/freebsd/freebsd_system.cc, kern/freebsd/freebsd_events.cc. arch/alpha/isa_traits.hh: Added constant for argument register 2 as it is needed by FreebsdSystem::doCalibrateClocks(). cpu/exec_context.hh: cpu/o3/alpha_cpu.hh: Replaced htoa()s with gtoh() and htog(). cpu/o3/fetch_impl.hh: cpu/simple/cpu.cc: Replaced htoa() with gtoh(). dev/disk_image.cc: Replaced htoa()s with letoh()s. dev/ide_ctrl.cc: Got rid of magic numbers. Added IdeChannel and IdeRegType type names where necessary. dev/ide_ctrl.hh: Got rid of unnecessary macros. Changed RegType_t to IdeRegType. Changed bmi_regs to allow accessing registers by name instead of just by array index. Added IdeChannel enum type to use in place of bool variables which were used to specify IDE channel. dev/ide_disk.cc: Rewrote IdeDisk::read and IdeDisk::write functions to specify registers by name instead of indexing through an array. dev/ide_disk.hh: Updated command register struct. dev/ns_gige.cc: dev/ns_gige.hh: Made ReadConfig and WriteConfig begin with a lower-case letter. writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pciconfigall.cc: writeConfig() now takes a pointer to data as a parameter instead of a copy of data. dev/pcidev.cc: Cleaned up readConfig() and writeConfig() functions. dev/pcidev.hh: Added macros to make code that works with the BARs (base adress registers) more readable. writeConfig() now takes a pointer to data. dev/pcireg.h: Changed PCIConfig struct to make accessing elements more straight forward. Removed type 1 (for PCI-to-PCI bridges) PCI configuration space struct since it is not used. dev/rtcreg.h: Added macros for bit fields in RTC status registers A & B. dev/sinic.cc: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. The accessing of elements of PCIConfig structure is updated. dev/sinic.hh: Function name change: WriteConfig --> writeConfig. writeConfig() now takes a pointer to data instead of a copy of data. dev/tsunami_io.cc: Added implementation of new RTC and PIT classes. dev/tsunami_io.hh: Added classes for RTC and PIT modules. dev/tsunamireg.h: Added macros for DMA ports used by Tsunami-Tru64. dev/uart8250.cc: Got rid of a magic number. Transmit (Tx) interrupts should clear upon a read of the Interrupt ID register. dev/uart8250.hh: Added comments and macros dealing with the UART Interrupt ID register. kern/linux/linux_system.cc: Replaced htoa() with htog(). python/m5/objects/Pci.py: PciFake is a python class for Pci Devices that do nothing. python/m5/objects/Tsunami.py: TsunamiFake was renamed as IsaFake. sim/system.cc: Replaced htoa()s with htog()s. dev/isa_fake.cc: New BitKeeper file ``dev/isa_fake.cc'' TsunamiFake was renamed as IsaFake. dev/isa_fake.hh: New BitKeeper file ``dev/isa_fake.hh'' TsunmaiFake was renamed as IsaFake. dev/pitreg.h: New BitKeeper file ``dev/pitreg.h'' Useful macros for working with PIT (Periodic Interval Timer) registers. --HG-- extra : convert_revision : 33f3a8a1034af4f6c71b32dd743e371c8613e780
2005-08-15 22:59:58 +02:00
*(uint8_t*)data = IIR_NOPEND;
//Tx interrupts are cleared on IIR reads
status &= ~TX_INT;
break;
case 0x3: // Line Control Register (LCR)
*(uint8_t*)data = LCR;
break;
case 0x4: // Modem Control Register (MCR)
break;
case 0x5: // Line Status Register (LSR)
uint8_t lsr;
lsr = 0;
// check if there are any bytes to be read
if (cons->dataAvailable())
lsr = UART_LSR_DR;
lsr |= UART_LSR_TEMT | UART_LSR_THRE;
*(uint8_t*)data = lsr;
break;
case 0x6: // Modem Status Register (MSR)
*(uint8_t*)data = 0;
break;
case 0x7: // Scratch Register (SCR)
*(uint8_t*)data = 0; // doesn't exist with at 8250.
break;
default:
panic("Tried to access a UART port that doesn't exist\n");
break;
}
return No_Fault;
}
Fault
Uart8250::write(MemReqPtr &req, const uint8_t *data)
{
Addr daddr = req->paddr - (addr & EV5::PAddrImplMask);
DPRINTF(Uart, " write register %#x value %#x\n", daddr, *(uint8_t*)data);
switch (daddr) {
case 0x0:
if (!(LCR & 0x80)) { // write byte
cons->out(*(uint8_t *)data);
platform->clearConsoleInt();
status &= ~TX_INT;
if (UART_IER_THRI & IER)
txIntrEvent.scheduleIntr();
} else { // dll divisor latch
;
}
break;
case 0x1:
if (!(LCR & 0x80)) { // Intr Enable Register(IER)
IER = *(uint8_t*)data;
if (UART_IER_THRI & IER)
{
DPRINTF(Uart, "IER: IER_THRI set, scheduling TX intrrupt\n");
txIntrEvent.scheduleIntr();
}
else
{
DPRINTF(Uart, "IER: IER_THRI cleared, descheduling TX intrrupt\n");
if (txIntrEvent.scheduled())
txIntrEvent.deschedule();
if (status & TX_INT)
platform->clearConsoleInt();
status &= ~TX_INT;
}
if ((UART_IER_RDI & IER) && cons->dataAvailable()) {
DPRINTF(Uart, "IER: IER_RDI set, scheduling RX intrrupt\n");
rxIntrEvent.scheduleIntr();
} else {
DPRINTF(Uart, "IER: IER_RDI cleared, descheduling RX intrrupt\n");
if (rxIntrEvent.scheduled())
rxIntrEvent.deschedule();
if (status & RX_INT)
platform->clearConsoleInt();
status &= ~RX_INT;
}
} else { // DLM divisor latch MSB
;
}
break;
case 0x2: // FIFO Control Register (FCR)
break;
case 0x3: // Line Control Register (LCR)
LCR = *(uint8_t*)data;
break;
case 0x4: // Modem Control Register (MCR)
if (*(uint8_t*)data == (UART_MCR_LOOP | 0x0A))
MCR = 0x9A;
break;
case 0x7: // Scratch Register (SCR)
// We are emulating a 8250 so we don't have a scratch reg
break;
default:
panic("Tried to access a UART port that doesn't exist\n");
break;
}
return No_Fault;
}
void
Uart8250::dataAvailable()
{
// if the kernel wants an interrupt when we have data
if (IER & UART_IER_RDI)
{
platform->postConsoleInt();
status |= RX_INT;
}
}
void
Uart8250::serialize(ostream &os)
{
SERIALIZE_SCALAR(status);
SERIALIZE_SCALAR(IER);
SERIALIZE_SCALAR(DLAB);
SERIALIZE_SCALAR(LCR);
SERIALIZE_SCALAR(MCR);
Tick rxintrwhen;
if (rxIntrEvent.scheduled())
rxintrwhen = rxIntrEvent.when();
else
rxintrwhen = 0;
Tick txintrwhen;
if (txIntrEvent.scheduled())
txintrwhen = txIntrEvent.when();
else
txintrwhen = 0;
SERIALIZE_SCALAR(rxintrwhen);
SERIALIZE_SCALAR(txintrwhen);
}
void
Uart8250::unserialize(Checkpoint *cp, const std::string &section)
{
UNSERIALIZE_SCALAR(status);
UNSERIALIZE_SCALAR(IER);
UNSERIALIZE_SCALAR(DLAB);
UNSERIALIZE_SCALAR(LCR);
UNSERIALIZE_SCALAR(MCR);
Tick rxintrwhen;
Tick txintrwhen;
UNSERIALIZE_SCALAR(rxintrwhen);
UNSERIALIZE_SCALAR(txintrwhen);
if (rxintrwhen != 0)
rxIntrEvent.schedule(rxintrwhen);
if (txintrwhen != 0)
txIntrEvent.schedule(txintrwhen);
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(Uart8250)
SimObjectParam<SimConsole *> console;
SimObjectParam<MemoryController *> mmu;
SimObjectParam<Platform *> platform;
Param<Addr> addr;
Param<Addr> size;
SimObjectParam<Bus*> pio_bus;
Param<Tick> pio_latency;
SimObjectParam<HierParams *> hier;
END_DECLARE_SIM_OBJECT_PARAMS(Uart8250)
BEGIN_INIT_SIM_OBJECT_PARAMS(Uart8250)
INIT_PARAM(console, "The console"),
INIT_PARAM(mmu, "Memory Controller"),
INIT_PARAM(platform, "Pointer to platfrom"),
INIT_PARAM(addr, "Device Address"),
INIT_PARAM_DFLT(size, "Device size", 0x8),
INIT_PARAM(pio_bus, ""),
INIT_PARAM_DFLT(pio_latency, "Programmed IO latency in bus cycles", 1),
INIT_PARAM_DFLT(hier, "Hierarchy global variables", &defaultHierParams)
END_INIT_SIM_OBJECT_PARAMS(Uart8250)
CREATE_SIM_OBJECT(Uart8250)
{
return new Uart8250(getInstanceName(), console, mmu, addr, size, hier,
pio_bus, pio_latency, platform);
}
REGISTER_SIM_OBJECT("Uart8250", Uart8250)