1 /* ASB2303-specific timer specifications
3 * Copyright (C) 2007, 2010 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
11 #ifndef _ASM_UNIT_TIMEX_H
12 #define _ASM_UNIT_TIMEX_H
14 #include <asm/timer-regs.h>
15 #include <unit/clock.h>
16 #include <asm/param.h>
19 * jiffies counter specifications
22 #define TMJCBR_MAX 0xffff
23 #define TMJCIRQ TM1IRQ
24 #define TMJCICR TM1ICR
28 #define MN10300_SRC_IOCLK MN10300_IOCLK
31 # error HZ undeclared.
33 /* use as little prescaling as possible to avoid losing accuracy */
34 #if (MN10300_SRC_IOCLK + HZ / 2) / HZ - 1 <= TMJCBR_MAX
35 # define IOCLK_PRESCALE 1
36 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK
37 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK
38 #elif (MN10300_SRC_IOCLK / 8 + HZ / 2) / HZ - 1 <= TMJCBR_MAX
39 # define IOCLK_PRESCALE 8
40 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_8
41 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_8
42 #elif (MN10300_SRC_IOCLK / 32 + HZ / 2) / HZ - 1 <= TMJCBR_MAX
43 # define IOCLK_PRESCALE 32
44 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_32
45 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_32
50 #define MN10300_JCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE)
51 #define MN10300_TSCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE)
53 #define MN10300_JC_PER_HZ ((MN10300_JCCLK + HZ / 2) / HZ)
54 #define MN10300_TSC_PER_HZ ((MN10300_TSCCLK + HZ / 2) / HZ)
56 static inline void stop_jiffies_counter(void)
59 TM01MD
= JC_TIMER_CLKSRC
| TM1MD_SRC_TM0CASCADE
<< 8;
63 static inline void reload_jiffies_counter(u32 cnt
)
70 TM01MD
= JC_TIMER_CLKSRC
| \
71 TM1MD_SRC_TM0CASCADE
<< 8 | \
72 TM0MD_INIT_COUNTER
| \
73 TM1MD_INIT_COUNTER
<< 8;
76 TM01MD
= JC_TIMER_CLKSRC
| \
77 TM1MD_SRC_TM0CASCADE
<< 8 | \
78 TM0MD_COUNT_ENABLE
| \
79 TM1MD_COUNT_ENABLE
<< 8;
84 #endif /* !__ASSEMBLY__ */
88 * timestamp counter specifications
91 #define TMTSCBR_MAX 0xffffffff
92 #define TMTSCBC TM45BC
96 static inline void startup_timestamp_counter(void)
100 /* set up timer 4 & 5 cascaded as a 32-bit counter to count real time
101 * - count down from 4Gig-1 to 0 and wrap at IOCLK rate
103 TM45BR
= TMTSCBR_MAX
;
106 TM4MD
= TSC_TIMER_CLKSRC
;
107 TM4MD
|= TM4MD_INIT_COUNTER
;
108 TM4MD
&= ~TM4MD_INIT_COUNTER
;
112 TM5MD
= TM5MD_SRC_TM4CASCADE
;
113 TM5MD
|= TM5MD_INIT_COUNTER
;
114 TM5MD
&= ~TM5MD_INIT_COUNTER
;
118 TM5MD
|= TM5MD_COUNT_ENABLE
;
119 TM4MD
|= TM4MD_COUNT_ENABLE
;
124 static inline void shutdown_timestamp_counter(void)
134 * we use a cascaded pair of 16-bit down-counting timers to count I/O
135 * clock cycles for the purposes of time keeping
137 typedef unsigned long cycles_t
;
139 static inline cycles_t
read_timestamp_counter(void)
141 return (cycles_t
)~TMTSCBC
;
144 #endif /* !__ASSEMBLY__ */
146 #endif /* _ASM_UNIT_TIMEX_H */