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 <linux/irq.h>
  22 #include <linux/clocksource.h>
  23 #include <asm/setup.h>
  24 #include <asm/system.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/machdep.h>
  27 #include <asm/MC68VZ328.h>
  28
  29 /***************************************************************************/
  30
  31 #if defined(CONFIG_DRAGEN2)
  32 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
  33 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  34 #define CLOCK_PRE       7
  35 #define TICKS_PER_JIFFY 41450
  36
  37 #elif defined(CONFIG_XCOPILOT_BUGS)
  38 /*
  39  * The only thing I know is that CLK32 is not available on Xcopilot
  40  * I have little idea about what frequency SYSCLK has on Xcopilot.
  41  * The values for prescaler and compare registers were simply
  42  * taken from the original source
  43  */
  44 #define CLOCK_SOURCE    TCTL_CLKSOURCE_SYSCLK
  45 #define CLOCK_PRE       2
  46 #define TICKS_PER_JIFFY 0xd7e4
  47
  48 #else
  49 /* default to using the 32Khz clock */
  50 #define CLOCK_SOURCE    TCTL_CLKSOURCE_32KHZ
  51 #define CLOCK_PRE       31
  52 #define TICKS_PER_JIFFY 10
  53 #endif
  54
  55 static u32 m68328_tick_cnt;
  56
  57 /***************************************************************************/
  58
  59 static irqreturn_t hw_tick(int irq, void *dummy)
  60 {
  61         /* Reset Timer1 */
  62         TSTAT &= 0;
  63
  64         m68328_tick_cnt += TICKS_PER_JIFFY;
  65         return arch_timer_interrupt(irq, dummy);
  66 }
  67
  68 /***************************************************************************/
  69
  70 <<<<<<< HEAD:arch/m68knommu/platform/68328/timers.c
  71 static irqreturn_t hw_tick(int irq, void *dummy)
  72 {
  73         /* Reset Timer1 */
  74         TSTAT &= 0;
  75
  76         return arch_timer_interrupt(irq, dummy);
  77 }
  78
  79 /***************************************************************************/
  80
  81 =======
  82 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/m68knommu/platform/68328/timers.c
  83 static struct irqaction m68328_timer_irq = {
  84         .name    = "timer",
  85         .flags   = IRQF_DISABLED | IRQF_TIMER,
  86         .handler = hw_tick,
  87 };
  88
  89 /***************************************************************************/
  90
  91 static cycle_t m68328_read_clk(void)
  92 {
  93         unsigned long flags;
  94         u32 cycles;
  95
  96         local_irq_save(flags);
  97         cycles = m68328_tick_cnt + TCN;
  98         local_irq_restore(flags);
  99
 100         return cycles;
 101 }
 102
 103 /***************************************************************************/
 104
 105 static struct clocksource m68328_clk = {
 106         .name   = "timer",
 107         .rating = 250,
 108         .read   = m68328_read_clk,
 109         .shift  = 20,
 110         .mask   = CLOCKSOURCE_MASK(32),
 111         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 112 };
 113
 114 /***************************************************************************/
 115
 116 void hw_timer_init(void)
 117 {
 118         /* disable timer 1 */
 119         TCTL = 0;
 120
 121         /* set ISR */
 122         setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
 123
 124         /* Restart mode, Enable int, Set clock source */
 125         TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
 126         TPRER = CLOCK_PRE;
 127         TCMP = TICKS_PER_JIFFY;
 128
 129         /* Enable timer 1 */
 130         TCTL |= TCTL_TEN;
 131         m68328_clk.mult = clocksource_hz2mult(TICKS_PER_JIFFY*HZ, m68328_clk.shift);
 132         clocksource_register(&m68328_clk);
 133 }
 134
 135 /***************************************************************************/
 136
 137 void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
 138 {
 139         long now = RTCTIME;
 140
 141         *year = *mon = *day = 1;
 142         *hour = (now >> 24) % 24;
 143         *min = (now >> 16) % 60;
 144         *sec = now % 60;
 145 }
 146
 147 /***************************************************************************/