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 <asm/setup.h>
  21 #include <asm/system.h>
  22 #include <asm/pgtable.h>
  23 #include <asm/irq.h>
  24 #include <asm/machdep.h>
  25 #include <asm/MC68VZ328.h>
  26
  27 /***************************************************************************/
  28
  29 #if defined(CONFIG_DRAGEN2)
  30 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
  31 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  32 #define CLOCK_PRE       7
  33 #define TICKS_PER_JIFFY 41450
  34
  35 #elif defined(CONFIG_XCOPILOT_BUGS)
  36 /*
  37  * The only thing I know is that CLK32 is not available on Xcopilot
  38  * I have little idea about what frequency SYSCLK has on Xcopilot.
  39  * The values for prescaler and compare registers were simply
  40  * taken from the original source
  41  */
  42 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  43 #define CLOCK_PRE       2
  44 #define TICKS_PER_JIFFY 0xd7e4
  45
  46 #else
  47 /* default to using the 32Khz clock */
  48 #define CLOCK_SOURCE    TCTL_CLKSOURCE_32KHZ
  49 #define CLOCK_PRE       31
  50 #define TICKS_PER_JIFFY 10
  51 #endif
  52
  53 /***************************************************************************/
  54
  55 void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
  56 {
  57         /* disable timer 1 */
  58         TCTL = 0;
  59
  60         /* set ISR */
  61         if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
  62                 panic("Unable to attach timer interrupt\n");
  63
  64         /* Restart mode, Enable int, Set clock source */
  65         TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
  66         TPRER = CLOCK_PRE;
  67         TCMP = TICKS_PER_JIFFY;
  68
  69         /* Enable timer 1 */
  70         TCTL |= TCTL_TEN;
  71 }
  72
  73 /***************************************************************************/
  74
  75 void m68328_timer_tick(void)
  76 {
  77         /* Reset Timer1 */
  78         TSTAT &= 0;
  79 }
  80 /***************************************************************************/
  81
  82 unsigned long m68328_timer_gettimeoffset(void)
  83 {
  84         unsigned long ticks = TCN, offset = 0;
  85
  86         /* check for pending interrupt */
  87         if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
  88                 offset = 1000000 / HZ;
  89         ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
  90         return ticks + offset;
  91 }
  92
  93 /***************************************************************************/
  94
  95 void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
  96 {
  97         long now = RTCTIME;
  98
  99         *year = *mon = *day = 1;
 100         *hour = (now >> 24) % 24;
 101         *min = (now >> 16) % 60;
 102         *sec = now % 60;
 103 }
 104
 105 /***************************************************************************/