release/src-rt-6.x/linux/linux-2.6/arch/m68knommu/platform/68328/timers.c

   1 /***************************************************************************/
   2
   3 /*
   4  *  linux/arch/m68knommu/platform/68328/timers.c
   5  *
   6  *  Copyright (C) 1993 Hamish Macdonald
   7  *  Copyright (C) 1999 D. Jeff Dionne
   8  *  Copyright (C) 2001 Georges Menie, Ken Desmet
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file COPYING in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 /***************************************************************************/
  16
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/interrupt.h>
  21 #include <asm/setup.h>
  22 #include <asm/system.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/irq.h>
  25 #include <asm/machdep.h>
  26 #include <asm/MC68VZ328.h>
  27
  28 /***************************************************************************/
  29
  30 #if defined(CONFIG_DRAGEN2)
  31 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
  32 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  33 #define CLOCK_PRE       7
  34 #define TICKS_PER_JIFFY 41450
  35
  36 #elif defined(CONFIG_XCOPILOT_BUGS)
  37 /*
  38  * The only thing I know is that CLK32 is not available on Xcopilot
  39  * I have little idea about what frequency SYSCLK has on Xcopilot.
  40  * The values for prescaler and compare registers were simply
  41  * taken from the original source
  42  */
  43 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  44 #define CLOCK_PRE       2
  45 #define TICKS_PER_JIFFY 0xd7e4
  46
  47 #else
  48 /* default to using the 32Khz clock */
  49 #define CLOCK_SOURCE    TCTL_CLKSOURCE_32KHZ
  50 #define CLOCK_PRE       31
  51 #define TICKS_PER_JIFFY 10
  52 #endif
  53
  54 /***************************************************************************/
  55
  56 void m68328_timer_init(irq_handler_t timer_routine)
  57 {
  58         /* disable timer 1 */
  59         TCTL = 0;
  60
  61         /* set ISR */
  62         if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
  63                 panic("Unable to attach timer interrupt\n");
  64
  65         /* Restart mode, Enable int, Set clock source */
  66         TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
  67         TPRER = CLOCK_PRE;
  68         TCMP = TICKS_PER_JIFFY;
  69
  70         /* Enable timer 1 */
  71         TCTL |= TCTL_TEN;
  72 }
  73
  74 /***************************************************************************/
  75
  76 void m68328_timer_tick(void)
  77 {
  78         /* Reset Timer1 */
  79         TSTAT &= 0;
  80 }
  81 /***************************************************************************/
  82
  83 unsigned long m68328_timer_gettimeoffset(void)
  84 {
  85         unsigned long ticks = TCN, offset = 0;
  86
  87         /* check for pending interrupt */
  88         if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
  89                 offset = 1000000 / HZ;
  90         ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
  91         return ticks + offset;
  92 }
  93
  94 /***************************************************************************/
  95
  96 void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
  97 {
  98         long now = RTCTIME;
  99
 100         *year = *mon = *day = 1;
 101         *hour = (now >> 24) % 24;
 102         *min = (now >> 16) % 60;
 103         *sec = now % 60;
 104 }
 105
 106 /***************************************************************************/