qemu/include/hw/timer/imx_epit.h
Axel Heider e662449aa6 hw/timer/imx_epit: remove explicit fields cnt and freq
The CNT register is a read-only register. There is no need to
store it's value, it can be calculated on demand.
The calculated frequency is needed temporarily only.

Note that this is a migration compatibility break for all boards
types that use the EPIT peripheral.

Signed-off-by: Axel Heider <axel.heider@hensoldt.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2023-01-05 12:14:43 +00:00

82 lines
2.3 KiB
C

/*
* i.MX EPIT Timer
*
* Copyright (c) 2008 OK Labs
* Copyright (c) 2011 NICTA Pty Ltd
* Originally written by Hans Jiang
* Updated by Peter Chubb
* Updated by Jean-Christophe Dubois <jcd@tribudubois.net>
*
* 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 IMX_EPIT_H
#define IMX_EPIT_H
#include "hw/sysbus.h"
#include "hw/ptimer.h"
#include "hw/misc/imx_ccm.h"
#include "qom/object.h"
/*
* EPIT: Enhanced periodic interrupt timer
*/
#define CR_EN (1 << 0)
#define CR_ENMOD (1 << 1)
#define CR_OCIEN (1 << 2)
#define CR_RLD (1 << 3)
#define CR_PRESCALE_SHIFT (4)
#define CR_PRESCALE_BITS (12)
#define CR_SWR (1 << 16)
#define CR_IOVW (1 << 17)
#define CR_DBGEN (1 << 18)
#define CR_WAITEN (1 << 19)
#define CR_DOZEN (1 << 20)
#define CR_STOPEN (1 << 21)
#define CR_CLKSRC_SHIFT (24)
#define CR_CLKSRC_BITS (2)
#define SR_OCIF (1 << 0)
#define EPIT_TIMER_MAX 0XFFFFFFFFUL
#define TYPE_IMX_EPIT "imx.epit"
OBJECT_DECLARE_SIMPLE_TYPE(IMXEPITState, IMX_EPIT)
struct IMXEPITState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
ptimer_state *timer_reload;
ptimer_state *timer_cmp;
MemoryRegion iomem;
IMXCCMState *ccm;
uint32_t cr;
uint32_t sr;
uint32_t lr;
uint32_t cmp;
qemu_irq irq;
};
#endif /* IMX_EPIT_H */