1 /* 2 * AVR 16-bit timer 3 * 4 * Copyright (c) 2018 University of Kent 5 * Author: Ed Robbins 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see 19 * <http://www.gnu.org/licenses/lgpl-2.1.html> 20 */ 21 22 /* 23 * Driver for 16 bit timers on 8 bit AVR devices. 24 * Note: 25 * On ATmega640/V-1280/V-1281/V-2560/V-2561/V timers 1, 3, 4 and 5 are 16 bit 26 */ 27 28 #ifndef HW_TIMER_AVR_TIMER16_H 29 #define HW_TIMER_AVR_TIMER16_H 30 31 #include "hw/sysbus.h" 32 #include "qemu/timer.h" 33 #include "hw/hw.h" 34 #include "qom/object.h" 35 36 enum NextInterrupt { 37 OVERFLOW, 38 COMPA, 39 COMPB, 40 COMPC, 41 CAPT 42 }; 43 44 #define TYPE_AVR_TIMER16 "avr-timer16" 45 OBJECT_DECLARE_SIMPLE_TYPE(AVRTimer16State, AVR_TIMER16) 46 47 struct AVRTimer16State { 48 /* <private> */ 49 SysBusDevice parent_obj; 50 51 /* <public> */ 52 MemoryRegion iomem; 53 MemoryRegion imsk_iomem; 54 MemoryRegion ifr_iomem; 55 QEMUTimer *timer; 56 qemu_irq capt_irq; 57 qemu_irq compa_irq; 58 qemu_irq compb_irq; 59 qemu_irq compc_irq; 60 qemu_irq ovf_irq; 61 62 bool enabled; 63 64 /* registers */ 65 uint8_t cra; 66 uint8_t crb; 67 uint8_t crc; 68 uint8_t cntl; 69 uint8_t cnth; 70 uint8_t icrl; 71 uint8_t icrh; 72 uint8_t ocral; 73 uint8_t ocrah; 74 uint8_t ocrbl; 75 uint8_t ocrbh; 76 uint8_t ocrcl; 77 uint8_t ocrch; 78 /* 79 * Reads and writes to CNT and ICR utilise a bizarre temporary 80 * register, which we emulate 81 */ 82 uint8_t rtmp; 83 uint8_t imsk; 84 uint8_t ifr; 85 86 uint8_t id; 87 uint64_t cpu_freq_hz; 88 uint64_t freq_hz; 89 uint64_t period_ns; 90 uint64_t reset_time_ns; 91 enum NextInterrupt next_interrupt; 92 }; 93 94 #endif /* HW_TIMER_AVR_TIMER16_H */ 95