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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | /* * linux/arch/m32r/kernel/time.c * * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata, * Hitoshi Yamamoto * Taken from i386 version. * Copyright (C) 1991, 1992, 1995 Linus Torvalds * Copyright (C) 1996, 1997, 1998 Ralf Baechle * * This file contains the time handling details for PC-style clocks as * found in some MIPS systems. * * Some code taken from sh version. * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> */ #undef DEBUG_TIMER #include <linux/errno.h> #include <linux/init.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/param.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/profile.h> #include <asm/io.h> #include <asm/m32r.h> #include <asm/hw_irq.h> #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) /* this needs a better home */ DEFINE_SPINLOCK(rtc_lock); #ifdef CONFIG_RTC_DRV_CMOS_MODULE EXPORT_SYMBOL(rtc_lock); #endif #endif /* pc-style 'CMOS' RTC support */ #ifdef CONFIG_SMP extern void smp_local_timer_interrupt(void); #endif #define TICK_SIZE (tick_nsec / 1000) /* * Change this if you have some constant time drift */ /* This is for machines which generate the exact clock. */ #define USECS_PER_JIFFY (1000000/HZ) static unsigned long latch; static u32 m32r_gettimeoffset(void) { unsigned long elapsed_time = 0; /* [us] */ #if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \ || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \ || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104) #ifndef CONFIG_SMP unsigned long count; /* timer count may underflow right here */ count = inl(M32R_MFT2CUT_PORTL); if (inl(M32R_ICU_CR18_PORTL) & 0x00000100) /* underflow check */ count = 0; count = (latch - count) * TICK_SIZE; elapsed_time = DIV_ROUND_CLOSEST(count, latch); /* NOTE: LATCH is equal to the "interval" value (= reload count). */ #else /* CONFIG_SMP */ unsigned long count; static unsigned long p_jiffies = -1; static unsigned long p_count = 0; /* timer count may underflow right here */ count = inl(M32R_MFT2CUT_PORTL); if (jiffies == p_jiffies && count > p_count) count = 0; p_jiffies = jiffies; p_count = count; count = (latch - count) * TICK_SIZE; elapsed_time = DIV_ROUND_CLOSEST(count, latch); /* NOTE: LATCH is equal to the "interval" value (= reload count). */ #endif /* CONFIG_SMP */ #elif defined(CONFIG_CHIP_M32310) #warning do_gettimeoffse not implemented #else #error no chip configuration #endif return elapsed_time * 1000; } /* * timer_interrupt() needs to keep up the real-time clock, * as well as call the "xtime_update()" routine every clocktick */ static irqreturn_t timer_interrupt(int irq, void *dev_id) { #ifndef CONFIG_SMP profile_tick(CPU_PROFILING); #endif xtime_update(1); #ifndef CONFIG_SMP update_process_times(user_mode(get_irq_regs())); #endif /* As we return to user mode fire off the other CPU schedulers.. this is basically because we don't yet share IRQ's around. This message is rigged to be safe on the 386 - basically it's a hack, so don't look closely for now.. */ #ifdef CONFIG_SMP smp_local_timer_interrupt(); smp_send_timer(); #endif return IRQ_HANDLED; } static struct irqaction irq0 = { .handler = timer_interrupt, .name = "MFT2", }; void read_persistent_clock(struct timespec *ts) { unsigned int epoch, year, mon, day, hour, min, sec; sec = min = hour = day = mon = year = 0; epoch = 0; year = 23; mon = 4; day = 17; /* Attempt to guess the epoch. This is the same heuristic as in rtc.c so no stupid things will happen to timekeeping. Who knows, maybe Ultrix also uses 1952 as epoch ... */ if (year > 10 && year < 44) epoch = 1980; else if (year < 96) epoch = 1952; year += epoch; ts->tv_sec = mktime(year, mon, day, hour, min, sec); ts->tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); } void __init time_init(void) { arch_gettimeoffset = m32r_gettimeoffset; #if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \ || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \ || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104) /* M32102 MFT setup */ setup_irq(M32R_IRQ_MFT2, &irq0); { unsigned long bus_clock; unsigned short divide; bus_clock = boot_cpu_data.bus_clock; divide = boot_cpu_data.timer_divide; latch = DIV_ROUND_CLOSEST(bus_clock/divide, HZ); printk("Timer start : latch = %ld\n", latch); outl((M32R_MFTMOD_CC_MASK | M32R_MFTMOD_TCCR \ |M32R_MFTMOD_CSSEL011), M32R_MFT2MOD_PORTL); outl(latch, M32R_MFT2RLD_PORTL); outl(latch, M32R_MFT2CUT_PORTL); outl(0, M32R_MFT2CMPRLD_PORTL); outl((M32R_MFTCR_MFT2MSK|M32R_MFTCR_MFT2EN), M32R_MFTCR_PORTL); } #elif defined(CONFIG_CHIP_M32310) #warning time_init not implemented #else #error no chip configuration #endif } |