arch/mn10300/unit-asb2364/include/unit/timex.h

   1 /* timex.h: MN2WS0038 architecture timer specifications
   2  *
   3  * Copyright (C) 2002, 2010 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_UNIT_TIMEX_H
  12 #define _ASM_UNIT_TIMEX_H
  13
  14 #include <asm/timer-regs.h>
  15 #include <unit/clock.h>
  16 #include <asm/param.h>
  17
  18 /*
  19  * jiffies counter specifications
  20  */
  21
  22 #define TMJCBR_MAX              0xffffff        /* 24bit */
  23 #define TMJCIRQ                 TMTIRQ
  24
  25 #ifndef __ASSEMBLY__
  26
  27 #define MN10300_SRC_IOBCLK      MN10300_IOBCLK
  28
  29 #ifndef HZ
  30 # error HZ undeclared.
  31 #endif /* !HZ */
  32
  33 #define MN10300_JCCLK           (MN10300_SRC_IOBCLK)
  34 #define MN10300_TSCCLK          (MN10300_SRC_IOBCLK)
  35
  36 #define MN10300_JC_PER_HZ       ((MN10300_JCCLK + HZ / 2) / HZ)
  37 #define MN10300_TSC_PER_HZ      ((MN10300_TSCCLK + HZ / 2) / HZ)
  38
  39 /* Check bit width of MTM interval value that sets base register */
  40 #if (MN10300_JC_PER_HZ - 1) > TMJCBR_MAX
  41 # error MTM tick timer interval value is overflow.
  42 #endif
  43
  44 static inline void stop_jiffies_counter(void)
  45 {
  46         u16 tmp;
  47         TMTMD = 0;
  48         tmp = TMTMD;
  49 }
  50
  51 static inline void reload_jiffies_counter(u32 cnt)
  52 {
  53         u32 tmp;
  54
  55         TMTBR = cnt;
  56         tmp = TMTBR;
  57
  58         TMTMD = TMTMD_TMTLDE;
  59         TMTMD = TMTMD_TMTCNE;
  60         tmp = TMTMD;
  61 }
  62
  63 #if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_CLOCKEVENTS) && \
  64     !defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
  65 /*
  66  * If we aren't using broadcasting, each core needs its own event timer.
  67  * Since CPU0 uses the tick timer which is 24-bits, we use timer 4 & 5
  68  * cascaded to 32-bits for CPU1 (but only really use 24-bits to match
  69  * CPU0).
  70  */
  71
  72 #define TMJC1IRQ                TM5IRQ
  73
  74 static inline void stop_jiffies_counter1(void)
  75 {
  76         u8 tmp;
  77         TM4MD = 0;
  78         TM5MD = 0;
  79         tmp = TM4MD;
  80         tmp = TM5MD;
  81 }
  82
  83 static inline void reload_jiffies_counter1(u32 cnt)
  84 {
  85         u32 tmp;
  86
  87         TM45BR = cnt;
  88         tmp = TM45BR;
  89
  90         TM4MD = TM4MD_INIT_COUNTER;
  91         tmp = TM4MD;
  92
  93         TM5MD = TM5MD_SRC_TM4CASCADE | TM5MD_INIT_COUNTER;
  94         TM5MD = TM5MD_SRC_TM4CASCADE | TM5MD_COUNT_ENABLE;
  95         tmp = TM5MD;
  96
  97         TM4MD = TM4MD_COUNT_ENABLE;
  98         tmp = TM4MD;
  99 }
 100 #endif /* CONFIG_SMP&GENERIC_CLOCKEVENTS&!GENERIC_CLOCKEVENTS_BROADCAST */
 101
 102 #endif /* !__ASSEMBLY__ */
 103
 104
 105 /*
 106  * timestamp counter specifications
 107  */
 108 #define TMTSCBR_MAX     0xffffffff
 109
 110 #ifndef __ASSEMBLY__
 111
 112 /* Use 32-bit timestamp counter */
 113 #define TMTSCMD         TMSMD
 114 #define TMTSCBR         TMSBR
 115 #define TMTSCBC         TMSBC
 116 #define TMTSCICR        TMSICR
 117
 118 static inline void startup_timestamp_counter(void)
 119 {
 120         u32 sync;
 121
 122         /* set up TMS(Timestamp) 32bit timer register to count real time
 123          * - count down from 4Gig-1 to 0 and wrap at IOBCLK rate
 124          */
 125
 126         TMTSCBR = TMTSCBR_MAX;
 127         sync = TMTSCBR;
 128
 129         TMTSCICR = 0;
 130         sync = TMTSCICR;
 131
 132         TMTSCMD = TMTMD_TMTLDE;
 133         TMTSCMD = TMTMD_TMTCNE;
 134         sync = TMTSCMD;
 135 }
 136
 137 static inline void shutdown_timestamp_counter(void)
 138 {
 139         TMTSCMD = 0;
 140 }
 141
 142 /*
 143  * we use a cascaded pair of 16-bit down-counting timers to count I/O
 144  * clock cycles for the purposes of time keeping
 145  */
 146 typedef unsigned long cycles_t;
 147
 148 static inline cycles_t read_timestamp_counter(void)
 149 {
 150         return (cycles_t)~TMTSCBC;
 151 }
 152
 153 #endif /* !__ASSEMBLY__ */
 154
 155 #endif /* _ASM_UNIT_TIMEX_H */