diff options
Diffstat (limited to 'arch/sparc64/kernel/time.c')
-rw-r--r-- | arch/sparc64/kernel/time.c | 389 |
1 files changed, 349 insertions, 40 deletions
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index a22930d62ad..e55b5c6ece0 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -30,6 +30,8 @@ #include <linux/cpufreq.h> #include <linux/percpu.h> #include <linux/profile.h> +#include <linux/miscdevice.h> +#include <linux/rtc.h> #include <asm/oplib.h> #include <asm/mostek.h> @@ -45,6 +47,7 @@ #include <asm/smp.h> #include <asm/sections.h> #include <asm/cpudata.h> +#include <asm/uaccess.h> DEFINE_SPINLOCK(mostek_lock); DEFINE_SPINLOCK(rtc_lock); @@ -193,16 +196,22 @@ struct sparc64_tick_ops *tick_ops __read_mostly = &tick_operations; static void stick_init_tick(unsigned long offset) { - tick_disable_protection(); - - /* Let the user get at STICK too. */ - __asm__ __volatile__( - " rd %%asr24, %%g2\n" - " andn %%g2, %0, %%g2\n" - " wr %%g2, 0, %%asr24" - : /* no outputs */ - : "r" (TICK_PRIV_BIT) - : "g1", "g2"); + /* Writes to the %tick and %stick register are not + * allowed on sun4v. The Hypervisor controls that + * bit, per-strand. + */ + if (tlb_type != hypervisor) { + tick_disable_protection(); + + /* Let the user get at STICK too. */ + __asm__ __volatile__( + " rd %%asr24, %%g2\n" + " andn %%g2, %0, %%g2\n" + " wr %%g2, 0, %%asr24" + : /* no outputs */ + : "r" (TICK_PRIV_BIT) + : "g1", "g2"); + } __asm__ __volatile__( " rd %%asr24, %%g1\n" @@ -632,23 +641,8 @@ static void __init set_system_time(void) mon = MSTK_REG_MONTH(mregs); year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) ); } else { - int i; - /* Dallas 12887 RTC chip. */ - /* Stolen from arch/i386/kernel/time.c, see there for - * credits and descriptive comments. - */ - for (i = 0; i < 1000000; i++) { - if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP) - break; - udelay(10); - } - for (i = 0; i < 1000000; i++) { - if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)) - break; - udelay(10); - } do { sec = CMOS_READ(RTC_SECONDS); min = CMOS_READ(RTC_MINUTES); @@ -657,6 +651,7 @@ static void __init set_system_time(void) mon = CMOS_READ(RTC_MONTH); year = CMOS_READ(RTC_YEAR); } while (sec != CMOS_READ(RTC_SECONDS)); + if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { BCD_TO_BIN(sec); BCD_TO_BIN(min); @@ -683,6 +678,83 @@ static void __init set_system_time(void) } } +/* davem suggests we keep this within the 4M locked kernel image */ +static u32 starfire_get_time(void) +{ + static char obp_gettod[32]; + static u32 unix_tod; + + sprintf(obp_gettod, "h# %08x unix-gettod", + (unsigned int) (long) &unix_tod); + prom_feval(obp_gettod); + + return unix_tod; +} + +static int starfire_set_time(u32 val) +{ + /* Do nothing, time is set using the service processor + * console on this platform. + */ + return 0; +} + +static u32 hypervisor_get_time(void) +{ + register unsigned long func asm("%o5"); + register unsigned long arg0 asm("%o0"); + register unsigned long arg1 asm("%o1"); + int retries = 10000; + +retry: + func = HV_FAST_TOD_GET; + arg0 = 0; + arg1 = 0; + __asm__ __volatile__("ta %6" + : "=&r" (func), "=&r" (arg0), "=&r" (arg1) + : "0" (func), "1" (arg0), "2" (arg1), + "i" (HV_FAST_TRAP)); + if (arg0 == HV_EOK) + return arg1; + if (arg0 == HV_EWOULDBLOCK) { + if (--retries > 0) { + udelay(100); + goto retry; + } + printk(KERN_WARNING "SUN4V: tod_get() timed out.\n"); + return 0; + } + printk(KERN_WARNING "SUN4V: tod_get() not supported.\n"); + return 0; +} + +static int hypervisor_set_time(u32 secs) +{ + register unsigned long func asm("%o5"); + register unsigned long arg0 asm("%o0"); + int retries = 10000; + +retry: + func = HV_FAST_TOD_SET; + arg0 = secs; + __asm__ __volatile__("ta %4" + : "=&r" (func), "=&r" (arg0) + : "0" (func), "1" (arg0), + "i" (HV_FAST_TRAP)); + if (arg0 == HV_EOK) + return 0; + if (arg0 == HV_EWOULDBLOCK) { + if (--retries > 0) { + udelay(100); + goto retry; + } + printk(KERN_WARNING "SUN4V: tod_set() timed out.\n"); + return -EAGAIN; + } + printk(KERN_WARNING "SUN4V: tod_set() not supported.\n"); + return -EOPNOTSUPP; +} + void __init clock_probe(void) { struct linux_prom_registers clk_reg[2]; @@ -702,14 +774,14 @@ void __init clock_probe(void) if (this_is_starfire) { - /* davem suggests we keep this within the 4M locked kernel image */ - static char obp_gettod[256]; - static u32 unix_tod; - - sprintf(obp_gettod, "h# %08x unix-gettod", - (unsigned int) (long) &unix_tod); - prom_feval(obp_gettod); - xtime.tv_sec = unix_tod; + xtime.tv_sec = starfire_get_time(); + xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); + set_normalized_timespec(&wall_to_monotonic, + -xtime.tv_sec, -xtime.tv_nsec); + return; + } + if (tlb_type == hypervisor) { + xtime.tv_sec = hypervisor_get_time(); xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ); set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec); @@ -981,11 +1053,10 @@ static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_reg } struct freq_table { - unsigned long udelay_val_ref; unsigned long clock_tick_ref; unsigned int ref_freq; }; -static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0, 0 }; +static DEFINE_PER_CPU(struct freq_table, sparc64_freq_table) = { 0, 0 }; unsigned long sparc64_get_clock_tick(unsigned int cpu) { @@ -1007,16 +1078,11 @@ static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val if (!ft->ref_freq) { ft->ref_freq = freq->old; - ft->udelay_val_ref = cpu_data(cpu).udelay_val; ft->clock_tick_ref = cpu_data(cpu).clock_tick; } if ((val == CPUFREQ_PRECHANGE && freq->old < freq->new) || (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) || (val == CPUFREQ_RESUMECHANGE)) { - cpu_data(cpu).udelay_val = - cpufreq_scale(ft->udelay_val_ref, - ft->ref_freq, - freq->new); cpu_data(cpu).clock_tick = cpufreq_scale(ft->clock_tick_ref, ft->ref_freq, @@ -1179,3 +1245,246 @@ static int set_rtc_mmss(unsigned long nowtime) return retval; } } + +#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */ +static unsigned char mini_rtc_status; /* bitmapped status byte. */ + +/* months start at 0 now */ +static unsigned char days_in_mo[] = +{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; + +#define FEBRUARY 2 +#define STARTOFTIME 1970 +#define SECDAY 86400L +#define SECYR (SECDAY * 365) +#define leapyear(year) ((year) % 4 == 0 && \ + ((year) % 100 != 0 || (year) % 400 == 0)) +#define days_in_year(a) (leapyear(a) ? 366 : 365) +#define days_in_month(a) (month_days[(a) - 1]) + +static int month_days[12] = { + 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 +}; + +/* + * This only works for the Gregorian calendar - i.e. after 1752 (in the UK) + */ +static void GregorianDay(struct rtc_time * tm) +{ + int leapsToDate; + int lastYear; + int day; + int MonthOffset[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; + + lastYear = tm->tm_year - 1; + + /* + * Number of leap corrections to apply up to end of last year + */ + leapsToDate = lastYear / 4 - lastYear / 100 + lastYear / 400; + + /* + * This year is a leap year if it is divisible by 4 except when it is + * divisible by 100 unless it is divisible by 400 + * + * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 was + */ + day = tm->tm_mon > 2 && leapyear(tm->tm_year); + + day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] + + tm->tm_mday; + + tm->tm_wday = day % 7; +} + +static void to_tm(int tim, struct rtc_time *tm) +{ + register int i; + register long hms, day; + + day = tim / SECDAY; + hms = tim % SECDAY; + + /* Hours, minutes, seconds are easy */ + tm->tm_hour = hms / 3600; + tm->tm_min = (hms % 3600) / 60; + tm->tm_sec = (hms % 3600) % 60; + + /* Number of years in days */ + for (i = STARTOFTIME; day >= days_in_year(i); i++) + day -= days_in_year(i); + tm->tm_year = i; + + /* Number of months in days left */ + if (leapyear(tm->tm_year)) + days_in_month(FEBRUARY) = 29; + for (i = 1; day >= days_in_month(i); i++) + day -= days_in_month(i); + days_in_month(FEBRUARY) = 28; + tm->tm_mon = i; + + /* Days are what is left over (+1) from all that. */ + tm->tm_mday = day + 1; + + /* + * Determine the day of week + */ + GregorianDay(tm); +} + +/* Both Starfire and SUN4V give us seconds since Jan 1st, 1970, + * aka Unix time. So we have to convert to/from rtc_time. + */ +static inline void mini_get_rtc_time(struct rtc_time *time) +{ + unsigned long flags; + u32 seconds; + + spin_lock_irqsave(&rtc_lock, flags); + seconds = 0; + if (this_is_starfire) + seconds = starfire_get_time(); + else if (tlb_type == hypervisor) + seconds = hypervisor_get_time(); + spin_unlock_irqrestore(&rtc_lock, flags); + + to_tm(seconds, time); + time->tm_year -= 1900; + time->tm_mon -= 1; +} + +static inline int mini_set_rtc_time(struct rtc_time *time) +{ + u32 seconds = mktime(time->tm_year + 1900, time->tm_mon + 1, + time->tm_mday, time->tm_hour, + time->tm_min, time->tm_sec); + unsigned long flags; + int err; + + spin_lock_irqsave(&rtc_lock, flags); + err = -ENODEV; + if (this_is_starfire) + err = starfire_set_time(seconds); + else if (tlb_type == hypervisor) + err = hypervisor_set_time(seconds); + spin_unlock_irqrestore(&rtc_lock, flags); + + return err; +} + +static int mini_rtc_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct rtc_time wtime; + void __user *argp = (void __user *)arg; + + switch (cmd) { + + case RTC_PLL_GET: + return -EINVAL; + + case RTC_PLL_SET: + return -EINVAL; + + case RTC_UIE_OFF: /* disable ints from RTC updates. */ + return 0; + + case RTC_UIE_ON: /* enable ints for RTC updates. */ + return -EINVAL; + + case RTC_RD_TIME: /* Read the time/date from RTC */ + /* this doesn't get week-day, who cares */ + memset(&wtime, 0, sizeof(wtime)); + mini_get_rtc_time(&wtime); + + return copy_to_user(argp, &wtime, sizeof(wtime)) ? -EFAULT : 0; + + case RTC_SET_TIME: /* Set the RTC */ + { + int year; + unsigned char leap_yr; + + if (!capable(CAP_SYS_TIME)) + return -EACCES; + + if (copy_from_user(&wtime, argp, sizeof(wtime))) + return -EFAULT; + + year = wtime.tm_year + 1900; + leap_yr = ((!(year % 4) && (year % 100)) || + !(year % 400)); + + if ((wtime.tm_mon < 0 || wtime.tm_mon > 11) || (wtime.tm_mday < 1)) + return -EINVAL; + + if (wtime.tm_mday < 0 || wtime.tm_mday > + (days_in_mo[wtime.tm_mon] + ((wtime.tm_mon == 1) && leap_yr))) + return -EINVAL; + + if (wtime.tm_hour < 0 || wtime.tm_hour >= 24 || + wtime.tm_min < 0 || wtime.tm_min >= 60 || + wtime.tm_sec < 0 || wtime.tm_sec >= 60) + return -EINVAL; + + return mini_set_rtc_time(&wtime); + } + } + + return -EINVAL; +} + +static int mini_rtc_open(struct inode *inode, struct file *file) +{ + if (mini_rtc_status & RTC_IS_OPEN) + return -EBUSY; + + mini_rtc_status |= RTC_IS_OPEN; + + return 0; +} + +static int mini_rtc_release(struct inode *inode, struct file *file) +{ + mini_rtc_status &= ~RTC_IS_OPEN; + return 0; +} + + +static struct file_operations mini_rtc_fops = { + .owner = THIS_MODULE, + .ioctl = mini_rtc_ioctl, + .open = mini_rtc_open, + .release = mini_rtc_release, +}; + +static struct miscdevice rtc_mini_dev = +{ + .minor = RTC_MINOR, + .name = "rtc", + .fops = &mini_rtc_fops, +}; + +static int __init rtc_mini_init(void) +{ + int retval; + + if (tlb_type != hypervisor && !this_is_starfire) + return -ENODEV; + + printk(KERN_INFO "Mini RTC Driver\n"); + + retval = misc_register(&rtc_mini_dev); + if (retval < 0) + return retval; + + return 0; +} + +static void __exit rtc_mini_exit(void) +{ + misc_deregister(&rtc_mini_dev); +} + + +module_init(rtc_mini_init); +module_exit(rtc_mini_exit); |