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hw/char/cmsdk-apb-timer: Implement CMSDK APB timer device

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Implement a model of the simple timer device found in the CMSDK.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 1500029487-14822-5-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-07-17 13:36:08 +01:00
parent 977a15f480
commit 5dd85b4b48
5 changed files with 319 additions and 0 deletions
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59
include/hw/timer/cmsdk-apb-timer.h Normal file
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/*
* ARM CMSDK APB timer emulation
*
* Copyright (c) 2017 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or
* (at your option) any later version.
*/
#ifndef CMSDK_APB_TIMER_H
#define CMSDK_APB_TIMER_H
#include "hw/sysbus.h"
#include "hw/ptimer.h"
#define TYPE_CMSDK_APB_TIMER "cmsdk-apb-timer"
#define CMSDK_APB_TIMER(obj) OBJECT_CHECK(CMSDKAPBTIMER, (obj), \
TYPE_CMSDK_APB_TIMER)
typedef struct {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
qemu_irq timerint;
uint32_t pclk_frq;
struct ptimer_state *timer;
uint32_t ctrl;
uint32_t value;
uint32_t reload;
uint32_t intstatus;
} CMSDKAPBTIMER;
/**
* cmsdk_apb_timer_create - convenience function to create TYPE_CMSDK_APB_TIMER
* @addr: location in system memory to map registers
* @pclk_frq: frequency in Hz of the PCLK clock (used for calculating baud rate)
*/
static inline DeviceState *cmsdk_apb_timer_create(hwaddr addr,
qemu_irq timerint,
uint32_t pclk_frq)
{
DeviceState *dev;
SysBusDevice *s;
dev = qdev_create(NULL, TYPE_CMSDK_APB_TIMER);
s = SYS_BUS_DEVICE(dev);
qdev_prop_set_uint32(dev, "pclk-frq", pclk_frq);
qdev_init_nofail(dev);
sysbus_mmio_map(s, 0, addr);
sysbus_connect_irq(s, 0, timerint);
return dev;
}
#endif