diff options
Diffstat (limited to 'arch/blackfin/kernel/time.c')
| -rw-r--r-- | arch/blackfin/kernel/time.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c deleted file mode 100644 index 3126b920a4a5..000000000000 --- a/arch/blackfin/kernel/time.c +++ /dev/null @@ -1,160 +0,0 @@ -/* - * arch/blackfin/kernel/time.c - * - * This file contains the Blackfin-specific time handling details. - * Most of the stuff is located in the machine specific files. - * - * Copyright 2004-2008 Analog Devices Inc. - * Licensed under the GPL-2 or later. - */ - -#include <linux/module.h> -#include <linux/profile.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/irq.h> -#include <linux/delay.h> -#include <linux/sched.h> - -#include <asm/blackfin.h> -#include <asm/time.h> -#include <asm/gptimers.h> - -/* This is an NTP setting */ -#define TICK_SIZE (tick_nsec / 1000) - -static struct irqaction bfin_timer_irq = { - .name = "Blackfin Timer Tick", -}; - -#if defined(CONFIG_IPIPE) -void __init setup_system_timer0(void) -{ - /* Power down the core timer, just to play safe. */ - bfin_write_TCNTL(0); - - disable_gptimers(TIMER0bit); - set_gptimer_status(0, TIMER_STATUS_TRUN0); - while (get_gptimer_status(0) & TIMER_STATUS_TRUN0) - udelay(10); - - set_gptimer_config(0, 0x59); /* IRQ enable, periodic, PWM_OUT, SCLKed, OUT PAD disabled */ - set_gptimer_period(TIMER0_id, get_sclk() / HZ); - set_gptimer_pwidth(TIMER0_id, 1); - SSYNC(); - enable_gptimers(TIMER0bit); -} -#else -void __init setup_core_timer(void) -{ - u32 tcount; - - /* power up the timer, but don't enable it just yet */ - bfin_write_TCNTL(TMPWR); - CSYNC(); - - /* the TSCALE prescaler counter */ - bfin_write_TSCALE(TIME_SCALE - 1); - - tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1); - bfin_write_TPERIOD(tcount); - bfin_write_TCOUNT(tcount); - - /* now enable the timer */ - CSYNC(); - - bfin_write_TCNTL(TAUTORLD | TMREN | TMPWR); -} -#endif - -static void __init -time_sched_init(irqreturn_t(*timer_routine) (int, void *)) -{ -#if defined(CONFIG_IPIPE) - setup_system_timer0(); - bfin_timer_irq.handler = timer_routine; - setup_irq(IRQ_TIMER0, &bfin_timer_irq); -#else - setup_core_timer(); - bfin_timer_irq.handler = timer_routine; - setup_irq(IRQ_CORETMR, &bfin_timer_irq); -#endif -} - -#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET -/* - * Should return useconds since last timer tick - */ -static u32 blackfin_gettimeoffset(void) -{ - unsigned long offset; - unsigned long clocks_per_jiffy; - -#if defined(CONFIG_IPIPE) - clocks_per_jiffy = bfin_read_TIMER0_PERIOD(); - offset = bfin_read_TIMER0_COUNTER() / \ - (((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC); - - if ((get_gptimer_status(0) & TIMER_STATUS_TIMIL0) && offset < (100000 / HZ / 2)) - offset += (USEC_PER_SEC / HZ); -#else - clocks_per_jiffy = bfin_read_TPERIOD(); - offset = (clocks_per_jiffy - bfin_read_TCOUNT()) / \ - (((clocks_per_jiffy + 1) * HZ) / USEC_PER_SEC); - - /* Check if we just wrapped the counters and maybe missed a tick */ - if ((bfin_read_ILAT() & (1 << IRQ_CORETMR)) - && (offset < (100000 / HZ / 2))) - offset += (USEC_PER_SEC / HZ); -#endif - return offset; -} -#endif - -/* - * timer_interrupt() needs to keep up the real-time clock, - * as well as call the "xtime_update()" routine every clocktick - */ -#ifdef CONFIG_CORE_TIMER_IRQ_L1 -__attribute__((l1_text)) -#endif -irqreturn_t timer_interrupt(int irq, void *dummy) -{ - xtime_update(1); - -#ifdef CONFIG_IPIPE - update_root_process_times(get_irq_regs()); -#else - update_process_times(user_mode(get_irq_regs())); -#endif - profile_tick(CPU_PROFILING); - - return IRQ_HANDLED; -} - -void read_persistent_clock(struct timespec *ts) -{ - time_t secs_since_1970 = (365 * 37 + 9) * 24 * 60 * 60; /* 1 Jan 2007 */ - ts->tv_sec = secs_since_1970; - ts->tv_nsec = 0; -} - -void __init time_init(void) -{ -#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET - arch_gettimeoffset = blackfin_gettimeoffset; -#endif - -#ifdef CONFIG_RTC_DRV_BFIN - /* [#2663] hack to filter junk RTC values that would cause - * userspace to have to deal with time values greater than - * 2^31 seconds (which uClibc cannot cope with yet) - */ - if ((bfin_read_RTC_STAT() & 0xC0000000) == 0xC0000000) { - printk(KERN_NOTICE "bfin-rtc: invalid date; resetting\n"); - bfin_write_RTC_STAT(0); - } -#endif - - time_sched_init(timer_interrupt); -} |
