Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Hirokazu Takata | bac33bd | 2009-08-26 13:13:12 +0900 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #ifdef CONFIG_SMP |
Al Viro | 9c8e7f5 | 2006-10-07 16:29:18 +0100 | [diff] [blame] | 46 | extern void smp_local_timer_interrupt(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #endif |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 60 | static u32 m32r_gettimeoffset(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) \ |
Hirokazu Takata | 9287d95 | 2006-01-06 00:18:41 -0800 | [diff] [blame] | 66 | || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Julia Lawall | 5602358 | 2009-08-02 10:47:27 +0200 | [diff] [blame] | 78 | elapsed_time = DIV_ROUND_CLOSEST(count, latch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Julia Lawall | 5602358 | 2009-08-02 10:47:27 +0200 | [diff] [blame] | 96 | elapsed_time = DIV_ROUND_CLOSEST(count, latch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
john stultz | 95ad759 | 2009-09-21 17:04:04 -0700 | [diff] [blame] | 105 | return elapsed_time * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | * timer_interrupt() needs to keep up the real-time clock, |
Torben Hohn | 7bde2ab | 2011-01-27 16:00:01 +0100 | [diff] [blame] | 110 | * as well as call the "xtime_update()" routine every clocktick |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | */ |
Adrian Bunk | 81e4807 | 2008-09-24 15:01:47 +0900 | [diff] [blame] | 112 | static irqreturn_t timer_interrupt(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | { |
| 114 | #ifndef CONFIG_SMP |
Al Viro | 9c8e7f5 | 2006-10-07 16:29:18 +0100 | [diff] [blame] | 115 | profile_tick(CPU_PROFILING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #endif |
Torben Hohn | 7bde2ab | 2011-01-27 16:00:01 +0100 | [diff] [blame] | 117 | xtime_update(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | #ifndef CONFIG_SMP |
Al Viro | 9c8e7f5 | 2006-10-07 16:29:18 +0100 | [diff] [blame] | 120 | update_process_times(user_mode(get_irq_regs())); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Al Viro | 9c8e7f5 | 2006-10-07 16:29:18 +0100 | [diff] [blame] | 128 | smp_local_timer_interrupt(); |
Hirokazu Takata | 2757a71 | 2005-08-01 21:11:35 -0700 | [diff] [blame] | 129 | smp_send_timer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | return IRQ_HANDLED; |
| 133 | } |
| 134 | |
Adrian Bunk | 81e4807 | 2008-09-24 15:01:47 +0900 | [diff] [blame] | 135 | static struct irqaction irq0 = { |
Thomas Gleixner | 977676a | 2007-10-16 01:26:36 -0700 | [diff] [blame] | 136 | .handler = timer_interrupt, |
| 137 | .flags = IRQF_DISABLED, |
Thomas Gleixner | 977676a | 2007-10-16 01:26:36 -0700 | [diff] [blame] | 138 | .name = "MFT2", |
| 139 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
John Stultz | 9446947 | 2010-03-03 19:57:25 -0800 | [diff] [blame] | 141 | void read_persistent_clock(struct timespec *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
John Stultz | 9446947 | 2010-03-03 19:57:25 -0800 | [diff] [blame] | 161 | ts->tv_sec = mktime(year, mon, day, hour, min, sec); |
| 162 | ts->tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); |
| 163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
John Stultz | 9446947 | 2010-03-03 19:57:25 -0800 | [diff] [blame] | 165 | |
| 166 | void __init time_init(void) |
| 167 | { |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 168 | arch_gettimeoffset = m32r_gettimeoffset; |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | #if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \ |
| 171 | || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \ |
Hirokazu Takata | 9287d95 | 2006-01-06 00:18:41 -0800 | [diff] [blame] | 172 | || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* M32102 MFT setup */ |
| 175 | setup_irq(M32R_IRQ_MFT2, &irq0); |
| 176 | { |
| 177 | unsigned long bus_clock; |
| 178 | unsigned short divide; |
| 179 | |
| 180 | bus_clock = boot_cpu_data.bus_clock; |
| 181 | divide = boot_cpu_data.timer_divide; |
Julia Lawall | 5602358 | 2009-08-02 10:47:27 +0200 | [diff] [blame] | 182 | latch = DIV_ROUND_CLOSEST(bus_clock/divide, HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | printk("Timer start : latch = %ld\n", latch); |
| 185 | |
| 186 | outl((M32R_MFTMOD_CC_MASK | M32R_MFTMOD_TCCR \ |
| 187 | |M32R_MFTMOD_CSSEL011), M32R_MFT2MOD_PORTL); |
| 188 | outl(latch, M32R_MFT2RLD_PORTL); |
| 189 | outl(latch, M32R_MFT2CUT_PORTL); |
| 190 | outl(0, M32R_MFT2CMPRLD_PORTL); |
| 191 | outl((M32R_MFTCR_MFT2MSK|M32R_MFTCR_MFT2EN), M32R_MFTCR_PORTL); |
| 192 | } |
| 193 | |
| 194 | #elif defined(CONFIG_CHIP_M32310) |
| 195 | #warning time_init not implemented |
| 196 | #else |
| 197 | #error no chip configuration |
| 198 | #endif |
| 199 | } |