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
15 #include <linux/irq.h>
16 #endif /* __ASSEMBLY__ */
18 #include <asm/timer-regs.h>
19 #include <unit/clock.h>
20 #include <asm/param.h>
23 * jiffies counter specifications
26 #define TMJCBR_MAX 0xffff
27 #define TMJCIRQ TM1IRQ
28 #define TMJCICR TM1ICR
32 #define MN10300_SRC_IOCLK MN10300_IOCLK
35 # error HZ undeclared.
37 /* use as little prescaling as possible to avoid losing accuracy */
38 #if (MN10300_SRC_IOCLK + HZ / 2) / HZ - 1 <= TMJCBR_MAX
39 # define IOCLK_PRESCALE 1
40 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK
41 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK
42 #elif (MN10300_SRC_IOCLK / 8 + HZ / 2) / HZ - 1 <= TMJCBR_MAX
43 # define IOCLK_PRESCALE 8
44 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_8
45 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_8
46 #elif (MN10300_SRC_IOCLK / 32 + HZ / 2) / HZ - 1 <= TMJCBR_MAX
47 # define IOCLK_PRESCALE 32
48 # define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_32
49 # define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_32
54 #define MN10300_JCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE)
55 #define MN10300_TSCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE)
57 #define MN10300_JC_PER_HZ ((MN10300_JCCLK + HZ / 2) / HZ)
58 #define MN10300_TSC_PER_HZ ((MN10300_TSCCLK + HZ / 2) / HZ)
60 static inline void stop_jiffies_counter(void)
63 TM01MD = JC_TIMER_CLKSRC | TM1MD_SRC_TM0CASCADE << 8;
67 static inline void reload_jiffies_counter(u32 cnt)
74 TM01MD = JC_TIMER_CLKSRC | \
75 TM1MD_SRC_TM0CASCADE << 8 | \
76 TM0MD_INIT_COUNTER | \
77 TM1MD_INIT_COUNTER << 8;
80 TM01MD = JC_TIMER_CLKSRC | \
81 TM1MD_SRC_TM0CASCADE << 8 | \
82 TM0MD_COUNT_ENABLE | \
83 TM1MD_COUNT_ENABLE << 8;
88 #endif /* !__ASSEMBLY__ */
92 * timestamp counter specifications
95 #define TMTSCBR_MAX 0xffffffff
96 #define TMTSCBC TM45BC
100 static inline void startup_timestamp_counter(void)
104 /* set up timer 4 & 5 cascaded as a 32-bit counter to count real time
105 * - count down from 4Gig-1 to 0 and wrap at IOCLK rate
107 TM45BR = TMTSCBR_MAX;
110 TM4MD = TSC_TIMER_CLKSRC;
111 TM4MD |= TM4MD_INIT_COUNTER;
112 TM4MD &= ~TM4MD_INIT_COUNTER;
116 TM5MD = TM5MD_SRC_TM4CASCADE;
117 TM5MD |= TM5MD_INIT_COUNTER;
118 TM5MD &= ~TM5MD_INIT_COUNTER;
122 TM5MD |= TM5MD_COUNT_ENABLE;
123 TM4MD |= TM4MD_COUNT_ENABLE;
128 static inline void shutdown_timestamp_counter(void)
138 * we use a cascaded pair of 16-bit down-counting timers to count I/O
139 * clock cycles for the purposes of time keeping
141 typedef unsigned long cycles_t;
143 static inline cycles_t read_timestamp_counter(void)
145 return (cycles_t)~TMTSCBC;
148 #endif /* !__ASSEMBLY__ */
150 #endif /* _ASM_UNIT_TIMEX_H */