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hw/timer/bcm2835: Add the BCM2835 SYS_timer

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Add the 64-bit free running timer. Do not model the COMPARE register
(no IRQ generated).
This timer is used by Linux kernel and recently U-Boot:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/clocksource/bcm2835_timer.c?h=v3.7
https://github.com/u-boot/u-boot/blob/v2019.07/include/configs/rpi.h#L19

Datasheet used:
https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20191019234715.25750-4-f4bug@amsat.org
[PMM: squashed in switch to using memset in reset]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2019-10-20 01:47:02 +02:00 • committed by Peter Maydell
parent d442d95f2f
commit d05be883fc
4 changed files with 202 additions and 0 deletions
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33
include/hw/timer/bcm2835_systmr.h Normal file
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/*
* BCM2835 SYS timer emulation
*
* Copyright (c) 2019 Philippe Mathieu-Daudé <f4bug@amsat.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef BCM2835_SYSTIMER_H
#define BCM2835_SYSTIMER_H
#include "hw/sysbus.h"
#include "hw/irq.h"
#define TYPE_BCM2835_SYSTIMER "bcm2835-sys-timer"
#define BCM2835_SYSTIMER(obj) \
OBJECT_CHECK(BCM2835SystemTimerState, (obj), TYPE_BCM2835_SYSTIMER)
typedef struct {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
qemu_irq irq;
struct {
uint32_t status;
uint32_t compare[4];
} reg;
} BCM2835SystemTimerState;
#endif