Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / mn10300 / unit-asb2303 / include / unit / timex.h
blobc37f9832cf17d0a7cb5b8795766aa4c5feebd88e
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
26 #ifndef __ASSEMBLY__
28 #define MN10300_SRC_IOCLK MN10300_IOCLK
30 #ifndef HZ
31 # error HZ undeclared.
32 #endif /* !HZ */
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
46 #else
47 # error You lose.
48 #endif
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)
58 u16 tmp;
59 TM01MD = JC_TIMER_CLKSRC | TM1MD_SRC_TM0CASCADE << 8;
60 tmp = TM01MD;
63 static inline void reload_jiffies_counter(u32 cnt)
65 u32 tmp;
67 TM01BR = cnt;
68 tmp = TM01BR;
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;
81 tmp = TM01MD;
84 #endif /* !__ASSEMBLY__ */
88 * timestamp counter specifications
91 #define TMTSCBR_MAX 0xffffffff
92 #define TMTSCBC TM45BC
94 #ifndef __ASSEMBLY__
96 static inline void startup_timestamp_counter(void)
98 u32 t32;
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;
104 t32 = TM45BR;
106 TM4MD = TSC_TIMER_CLKSRC;
107 TM4MD |= TM4MD_INIT_COUNTER;
108 TM4MD &= ~TM4MD_INIT_COUNTER;
109 TM4ICR = 0;
110 t32 = TM4ICR;
112 TM5MD = TM5MD_SRC_TM4CASCADE;
113 TM5MD |= TM5MD_INIT_COUNTER;
114 TM5MD &= ~TM5MD_INIT_COUNTER;
115 TM5ICR = 0;
116 t32 = TM5ICR;
118 TM5MD |= TM5MD_COUNT_ENABLE;
119 TM4MD |= TM4MD_COUNT_ENABLE;
120 t32 = TM5MD;
121 t32 = TM4MD;
124 static inline void shutdown_timestamp_counter(void)
126 u8 t8;
127 TM4MD = 0;
128 TM5MD = 0;
129 t8 = TM4MD;
130 t8 = TM5MD;
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 */