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These were designed to facilitate testing but should provide enough function to be useful in other contexts. Only a subset of the functions of each peripheral is implemented, mainly due to the lack of a standard way to handle electrical connections (like GPIO pins). [AM: Remove word 'Atmel' from filenames and all elements of code] Suggested-by: Aleksandar Markovic <aleksandar.m.mail@gmail.com> Signed-off-by: Sarah Harris <S.E.Harris@kent.ac.uk> Signed-off-by: Ed Robbins <E.J.C.Robbins@kent.ac.uk> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> [rth: Squash info mtree fixes and a file rename from f4bug] Signed-off-by: Richard Henderson <richard.henderson@linaro.org> [PMD: Use qemu_log_mask(LOG_UNIMP), replace goto by return] Signed-off-by: Aleksandar Markovic <aleksandar.m.mail@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Thomas Huth <huth@tuxfamily.org> Message-Id: <20200705140315.260514-21-huth@tuxfamily.org> [PMD: Check cpu-frequency-hz property in realize()] Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* AVR 16-bit timer
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*
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* Copyright (c) 2018 University of Kent
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* Author: Ed Robbins
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see
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* <http://www.gnu.org/licenses/lgpl-2.1.html>
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*/
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/*
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* Driver for 16 bit timers on 8 bit AVR devices.
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* Note:
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* On ATmega640/V-1280/V-1281/V-2560/V-2561/V timers 1, 3, 4 and 5 are 16 bit
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*/
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#ifndef HW_TIMER_AVR_TIMER16_H
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#define HW_TIMER_AVR_TIMER16_H
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#include "hw/sysbus.h"
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#include "qemu/timer.h"
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#include "hw/hw.h"
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enum NextInterrupt {
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OVERFLOW,
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COMPA,
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COMPB,
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COMPC,
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CAPT
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};
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#define TYPE_AVR_TIMER16 "avr-timer16"
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#define AVR_TIMER16(obj) \
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OBJECT_CHECK(AVRTimer16State, (obj), TYPE_AVR_TIMER16)
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typedef struct AVRTimer16State {
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/* <private> */
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SysBusDevice parent_obj;
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/* <public> */
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MemoryRegion iomem;
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MemoryRegion imsk_iomem;
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MemoryRegion ifr_iomem;
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QEMUTimer *timer;
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qemu_irq capt_irq;
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qemu_irq compa_irq;
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qemu_irq compb_irq;
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qemu_irq compc_irq;
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qemu_irq ovf_irq;
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bool enabled;
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/* registers */
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uint8_t cra;
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uint8_t crb;
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uint8_t crc;
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uint8_t cntl;
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uint8_t cnth;
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uint8_t icrl;
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uint8_t icrh;
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uint8_t ocral;
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uint8_t ocrah;
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uint8_t ocrbl;
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uint8_t ocrbh;
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uint8_t ocrcl;
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uint8_t ocrch;
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/*
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* Reads and writes to CNT and ICR utilise a bizarre temporary
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* register, which we emulate
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*/
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uint8_t rtmp;
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uint8_t imsk;
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uint8_t ifr;
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uint8_t id;
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uint64_t cpu_freq_hz;
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uint64_t freq_hz;
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uint64_t period_ns;
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uint64_t reset_time_ns;
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enum NextInterrupt next_interrupt;
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} AVRTimer16State;
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#endif /* HW_TIMER_AVR_TIMER16_H */
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