The mc146818_get_time/mc146818_set_time functions are rather large inline functions in a global header file and are used in several drivers and in x86 specific code. Here we move them into a separate .c file that is compiled whenever any of the users require it. This also lets us remove the linux/acpi.h header inclusion from mc146818rtc.h, which in turn avoids some warnings about duplicate definition of the TRUE/FALSE macros. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>tirimbino
Arnd Bergmann
9 years ago
committed by
Alexandre Belloni
parent
5ee98ab3a8
commit
d6faca40f4
@ -0,0 +1,198 @@ |
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#include <linux/bcd.h> |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/mc146818rtc.h> |
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#ifdef CONFIG_ACPI |
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#include <linux/acpi.h> |
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#endif |
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/*
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* Returns true if a clock update is in progress |
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*/ |
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static inline unsigned char mc146818_is_updating(void) |
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{ |
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unsigned char uip; |
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unsigned long flags; |
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spin_lock_irqsave(&rtc_lock, flags); |
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uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return uip; |
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} |
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unsigned int mc146818_get_time(struct rtc_time *time) |
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{ |
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unsigned char ctrl; |
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unsigned long flags; |
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unsigned char century = 0; |
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#ifdef CONFIG_MACH_DECSTATION |
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unsigned int real_year; |
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#endif |
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/*
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* read RTC once any update in progress is done. The update |
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* can take just over 2ms. We wait 20ms. There is no need to |
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* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. |
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* If you need to know *exactly* when a second has started, enable |
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* periodic update complete interrupts, (via ioctl) and then |
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* immediately read /dev/rtc which will block until you get the IRQ. |
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* Once the read clears, read the RTC time (again via ioctl). Easy. |
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*/ |
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if (mc146818_is_updating()) |
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mdelay(20); |
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/*
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* Only the values that we read from the RTC are set. We leave |
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* tm_wday, tm_yday and tm_isdst untouched. Even though the |
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* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated |
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* by the RTC when initially set to a non-zero value. |
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*/ |
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spin_lock_irqsave(&rtc_lock, flags); |
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time->tm_sec = CMOS_READ(RTC_SECONDS); |
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time->tm_min = CMOS_READ(RTC_MINUTES); |
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time->tm_hour = CMOS_READ(RTC_HOURS); |
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time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); |
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time->tm_mon = CMOS_READ(RTC_MONTH); |
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time->tm_year = CMOS_READ(RTC_YEAR); |
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#ifdef CONFIG_MACH_DECSTATION |
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real_year = CMOS_READ(RTC_DEC_YEAR); |
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#endif |
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#ifdef CONFIG_ACPI |
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && |
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acpi_gbl_FADT.century) |
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century = CMOS_READ(acpi_gbl_FADT.century); |
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#endif |
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ctrl = CMOS_READ(RTC_CONTROL); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) |
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{ |
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time->tm_sec = bcd2bin(time->tm_sec); |
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time->tm_min = bcd2bin(time->tm_min); |
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time->tm_hour = bcd2bin(time->tm_hour); |
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time->tm_mday = bcd2bin(time->tm_mday); |
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time->tm_mon = bcd2bin(time->tm_mon); |
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time->tm_year = bcd2bin(time->tm_year); |
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century = bcd2bin(century); |
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} |
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#ifdef CONFIG_MACH_DECSTATION |
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time->tm_year += real_year - 72; |
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#endif |
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if (century) |
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time->tm_year += (century - 19) * 100; |
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/*
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* Account for differences between how the RTC uses the values |
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* and how they are defined in a struct rtc_time; |
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*/ |
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if (time->tm_year <= 69) |
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time->tm_year += 100; |
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time->tm_mon--; |
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return RTC_24H; |
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} |
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EXPORT_SYMBOL_GPL(mc146818_get_time); |
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/* Set the current date and time in the real time clock. */ |
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int mc146818_set_time(struct rtc_time *time) |
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{ |
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unsigned long flags; |
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unsigned char mon, day, hrs, min, sec; |
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unsigned char save_control, save_freq_select; |
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unsigned int yrs; |
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#ifdef CONFIG_MACH_DECSTATION |
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unsigned int real_yrs, leap_yr; |
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#endif |
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unsigned char century = 0; |
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yrs = time->tm_year; |
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mon = time->tm_mon + 1; /* tm_mon starts at zero */ |
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day = time->tm_mday; |
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hrs = time->tm_hour; |
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min = time->tm_min; |
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sec = time->tm_sec; |
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if (yrs > 255) /* They are unsigned */ |
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return -EINVAL; |
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spin_lock_irqsave(&rtc_lock, flags); |
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#ifdef CONFIG_MACH_DECSTATION |
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real_yrs = yrs; |
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leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) || |
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!((yrs + 1900) % 400)); |
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yrs = 72; |
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/*
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* We want to keep the year set to 73 until March |
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* for non-leap years, so that Feb, 29th is handled |
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* correctly. |
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*/ |
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if (!leap_yr && mon < 3) { |
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real_yrs--; |
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yrs = 73; |
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} |
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#endif |
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#ifdef CONFIG_ACPI |
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && |
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acpi_gbl_FADT.century) { |
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century = (yrs + 1900) / 100; |
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yrs %= 100; |
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} |
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#endif |
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/* These limits and adjustments are independent of
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* whether the chip is in binary mode or not. |
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*/ |
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if (yrs > 169) { |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return -EINVAL; |
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} |
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if (yrs >= 100) |
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yrs -= 100; |
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if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) |
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|| RTC_ALWAYS_BCD) { |
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sec = bin2bcd(sec); |
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min = bin2bcd(min); |
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hrs = bin2bcd(hrs); |
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day = bin2bcd(day); |
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mon = bin2bcd(mon); |
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yrs = bin2bcd(yrs); |
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century = bin2bcd(century); |
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} |
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save_control = CMOS_READ(RTC_CONTROL); |
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CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); |
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save_freq_select = CMOS_READ(RTC_FREQ_SELECT); |
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CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); |
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#ifdef CONFIG_MACH_DECSTATION |
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CMOS_WRITE(real_yrs, RTC_DEC_YEAR); |
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#endif |
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CMOS_WRITE(yrs, RTC_YEAR); |
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CMOS_WRITE(mon, RTC_MONTH); |
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CMOS_WRITE(day, RTC_DAY_OF_MONTH); |
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CMOS_WRITE(hrs, RTC_HOURS); |
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CMOS_WRITE(min, RTC_MINUTES); |
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CMOS_WRITE(sec, RTC_SECONDS); |
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#ifdef CONFIG_ACPI |
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && |
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acpi_gbl_FADT.century) |
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CMOS_WRITE(century, acpi_gbl_FADT.century); |
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#endif |
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CMOS_WRITE(save_control, RTC_CONTROL); |
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CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); |
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spin_unlock_irqrestore(&rtc_lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(mc146818_set_time); |
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