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Linux/arch/m32r/kernel/time.c

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

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