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hw/timer: Initial commit of Ibex Timer

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Add support for the Ibex timer. This is used with the RISC-V
mtime/mtimecmp similar to the SiFive CLINT.

We currently don't support changing the prescale or the timervalue.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 716fdea2244515ce86a2c46fe69467d013c03147.1624001156.git.alistair.francis@wdc.com
This commit is contained in:
Alistair Francis 2021-06-18 17:27:54 +10:00
parent bdc36ce649
commit df41cbd6bf
4 changed files with 360 additions and 4 deletions
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52
include/hw/timer/ibex_timer.h Normal file
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/*
* QEMU lowRISC Ibex Timer device
*
* Copyright (c) 2021 Western Digital
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef HW_IBEX_TIMER_H
#define HW_IBEX_TIMER_H
#include "hw/sysbus.h"
#define TYPE_IBEX_TIMER "ibex-timer"
OBJECT_DECLARE_SIMPLE_TYPE(IbexTimerState, IBEX_TIMER)
struct IbexTimerState {
/* <private> */
SysBusDevice parent_obj;
/* <public> */
MemoryRegion mmio;
uint32_t timer_ctrl;
uint32_t timer_cfg0;
uint32_t timer_compare_lower0;
uint32_t timer_compare_upper0;
uint32_t timer_intr_enable;
uint32_t timer_intr_state;
uint32_t timer_intr_test;
uint32_t timebase_freq;
qemu_irq irq;
};
#endif /* HW_IBEX_TIMER_H */