2 * Copyright (c) 2005 The Regents of The University of Michigan
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
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9 * redistributions in binary form must reproduce the above copyright
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12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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35 #ifndef __DEV_UART8250_HH__
36 #define __DEV_UART8250_HH__
38 #include "dev/tsunamireg.h"
39 #include "base/range.hh"
40 #include "dev/io_device.hh"
41 #include "dev/uart.hh"
44 /* UART8250 Interrupt ID Register
45 * bit 0 Interrupt Pending 0 = true, 1 = false
46 * bit 2:1 ID of highest priority interrupt
49 const uint8_t IIR_NOPEND = 0x1;
52 const uint8_t IIR_MODEM = 0x00; /* Modem Status (lowest priority) */
53 const uint8_t IIR_TXID = 0x02; /* Tx Data */
54 const uint8_t IIR_RXID = 0x04; /* Rx Data */
55 const uint8_t IIR_LINE = 0x06; /* Rx Line Status (highest priority)*/
60 class Uart8250 : public Uart
65 uint8_t IER, DLAB, LCR, MCR;
67 class IntrEvent : public Event
73 IntrEvent(Uart8250 *u, int bit);
74 virtual void process();
75 virtual const char *description();
79 IntrEvent txIntrEvent;
80 IntrEvent rxIntrEvent;
85 virtual Tick read(Packet *pkt);
86 virtual Tick write(Packet *pkt);
87 virtual void addressRanges(AddrRangeList &range_list);
91 * Inform the uart that there is data available.
93 virtual void dataAvailable();
97 * Return if we have an interrupt pending
98 * @return interrupt status
100 virtual bool intStatus() { return status ? true : false; }
102 virtual void serialize(std::ostream &os);
103 virtual void unserialize(Checkpoint *cp, const std::string §ion);
107 #endif // __TSUNAMI_UART_HH__