| /***************************************************************************/ |
| |
| /* |
| * 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/types.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <asm/setup.h> |
| #include <asm/system.h> |
| #include <asm/pgtable.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 |
| |
| /***************************************************************************/ |
| |
| static struct irqaction m68328_timer_irq = { |
| .name = "timer", |
| .flags = IRQF_DISABLED | IRQF_TIMER, |
| }; |
| |
| void m68328_timer_init(irq_handler_t timer_routine) |
| { |
| /* disable timer 1 */ |
| TCTL = 0; |
| |
| /* set ISR */ |
| m68328_timer_irq.handler = timer_routine; |
| setup_irq(TMR_IRQ_NUM, &m68328_timer_irq); |
| |
| /* 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; |
| } |
| |
| /***************************************************************************/ |