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Linux/arch/m68k/platform/68000/timers.c

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  1 /***************************************************************************/
  2 
  3 /*
  4  *  timers.c - Generic hardware timer support.
  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 <linux/rtc.h>
 24 #include <asm/setup.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 static irq_handler_t timer_interrupt;
 57 
 58 /***************************************************************************/
 59 
 60 static irqreturn_t hw_tick(int irq, void *dummy)
 61 {
 62         /* Reset Timer1 */
 63         TSTAT &= 0;
 64 
 65         m68328_tick_cnt += TICKS_PER_JIFFY;
 66         return timer_interrupt(irq, dummy);
 67 }
 68 
 69 /***************************************************************************/
 70 
 71 static struct irqaction m68328_timer_irq = {
 72         .name    = "timer",
 73         .flags   = IRQF_DISABLED | IRQF_TIMER,
 74         .handler = hw_tick,
 75 };
 76 
 77 /***************************************************************************/
 78 
 79 static cycle_t m68328_read_clk(struct clocksource *cs)
 80 {
 81         unsigned long flags;
 82         u32 cycles;
 83 
 84         local_irq_save(flags);
 85         cycles = m68328_tick_cnt + TCN;
 86         local_irq_restore(flags);
 87 
 88         return cycles;
 89 }
 90 
 91 /***************************************************************************/
 92 
 93 static struct clocksource m68328_clk = {
 94         .name   = "timer",
 95         .rating = 250,
 96         .read   = m68328_read_clk,
 97         .mask   = CLOCKSOURCE_MASK(32),
 98         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 99 };
100 
101 /***************************************************************************/
102 
103 void hw_timer_init(irq_handler_t handler)
104 {
105         /* disable timer 1 */
106         TCTL = 0;
107 
108         /* set ISR */
109         setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
110 
111         /* Restart mode, Enable int, Set clock source */
112         TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
113         TPRER = CLOCK_PRE;
114         TCMP = TICKS_PER_JIFFY;
115 
116         /* Enable timer 1 */
117         TCTL |= TCTL_TEN;
118         clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
119         timer_interrupt = handler;
120 }
121 
122 /***************************************************************************/
123 
124 int m68328_hwclk(int set, struct rtc_time *t)
125 {
126         if (!set) {
127                 long now = RTCTIME;
128                 t->tm_year = t->tm_mon = t->tm_mday = 1;
129                 t->tm_hour = (now >> 24) % 24;
130                 t->tm_min = (now >> 16) % 60;
131                 t->tm_sec = now % 60;
132         }
133 
134         return 0;
135 }
136 
137 /***************************************************************************/
138 

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