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| -rw-r--r-- | arch/m68knommu/platform/68328/timers.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/68328/timers.c b/arch/m68knommu/platform/68328/timers.c new file mode 100644 index 00000000000..68c2cd6b003 --- /dev/null +++ b/arch/m68knommu/platform/68328/timers.c @@ -0,0 +1,106 @@ +/***************************************************************************/ + +/* + * linux/arch/m68knommu/platform/68328/timers.c + * + * Copyright (C) 1993 Hamish Macdonald + * Copyright (C) 1999 D. Jeff Dionne + * Copyright (C) 2001 Georges Menie, Ken Desmet + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +/***************************************************************************/ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <asm/setup.h> +#include <asm/system.h> +#include <asm/pgtable.h> +#include <asm/irq.h> +#include <asm/machdep.h> +#include <asm/MC68VZ328.h> + +/***************************************************************************/ + +#if defined(CONFIG_DRAGEN2) +/* with a 33.16 MHz clock, this will give usec resolution to the time functions */ +#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK +#define CLOCK_PRE 7 +#define TICKS_PER_JIFFY 41450 + +#elif defined(CONFIG_XCOPILOT_BUGS) +/* + * The only thing I know is that CLK32 is not available on Xcopilot + * I have little idea about what frequency SYSCLK has on Xcopilot. + * The values for prescaler and compare registers were simply + * taken from the original source + */ +#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK +#define CLOCK_PRE 2 +#define TICKS_PER_JIFFY 0xd7e4 + +#else +/* default to using the 32Khz clock */ +#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ +#define CLOCK_PRE 31 +#define TICKS_PER_JIFFY 10 +#endif + +/***************************************************************************/ + +void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *)) +{ + /* disable timer 1 */ + TCTL = 0; + + /* set ISR */ + if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL)) + panic("Unable to attach timer interrupt\n"); + + /* Restart mode, Enable int, Set clock source */ + TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; + TPRER = CLOCK_PRE; + TCMP = TICKS_PER_JIFFY; + + /* Enable timer 1 */ + TCTL |= TCTL_TEN; +} + +/***************************************************************************/ + +void m68328_timer_tick(void) +{ + /* Reset Timer1 */ + TSTAT &= 0; +} +/***************************************************************************/ + +unsigned long m68328_timer_gettimeoffset(void) +{ + unsigned long ticks = TCN, offset = 0; + + /* check for pending interrupt */ + if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM))) + offset = 1000000 / HZ; + ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY; + return ticks + offset; +} + +/***************************************************************************/ + +void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec) +{ + long now = RTCTIME; + + *year = *mon = *day = 1; + *hour = (now >> 24) % 24; + *min = (now >> 16) % 60; + *sec = now % 60; +} + +/***************************************************************************/ |