xref: /openbmc/qemu/include/hw/timer/mss-timer.h (revision 2b74dd91)
1 /*
2  * Microsemi SmartFusion2 Timer.
3  *
4  * Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com>
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #ifndef HW_MSS_TIMER_H
26 #define HW_MSS_TIMER_H
27 
28 #include "hw/sysbus.h"
29 #include "hw/ptimer.h"
30 #include "qom/object.h"
31 
32 #define TYPE_MSS_TIMER     "mss-timer"
33 OBJECT_DECLARE_SIMPLE_TYPE(MSSTimerState, MSS_TIMER)
34 
35 /*
36  * There are two 32-bit down counting timers.
37  * Timers 1 and 2 can be concatenated into a single 64-bit Timer
38  * that operates either in Periodic mode or in One-shot mode.
39  * Writing 1 to the TIM64_MODE register bit 0 sets the Timers in 64-bit mode.
40  * In 64-bit mode, writing to the 32-bit registers has no effect.
41  * Similarly, in 32-bit mode, writing to the 64-bit mode registers
42  * has no effect. Only two 32-bit timers are supported currently.
43  */
44 #define NUM_TIMERS        2
45 
46 #define R_TIM1_MAX        6
47 
48 struct Msf2Timer {
49     ptimer_state *ptimer;
50 
51     uint32_t regs[R_TIM1_MAX];
52     qemu_irq irq;
53 };
54 
55 struct MSSTimerState {
56     SysBusDevice parent_obj;
57 
58     MemoryRegion mmio;
59     uint32_t freq_hz;
60     struct Msf2Timer timers[NUM_TIMERS];
61 };
62 
63 #endif /* HW_MSS_TIMER_H */
64