diff options
Diffstat (limited to 'arch/powerpc/platforms/chrp/time.c')
| -rw-r--r-- | arch/powerpc/platforms/chrp/time.c | 89 |
1 files changed, 30 insertions, 59 deletions
diff --git a/arch/powerpc/platforms/chrp/time.c b/arch/powerpc/platforms/chrp/time.c index 737ee5d9f0a..f803f4b8ab6 100644 --- a/arch/powerpc/platforms/chrp/time.c +++ b/arch/powerpc/platforms/chrp/time.c @@ -1,6 +1,4 @@ /* - * arch/ppc/platforms/chrp_time.c - * * Copyright (C) 1991, 1992, 1995 Linus Torvalds * * Adapted for PowerPC (PReP) by Gary Thomas @@ -21,6 +19,7 @@ #include <linux/mc146818rtc.h> #include <linux/init.h> #include <linux/bcd.h> +#include <linux/ioport.h> #include <asm/io.h> #include <asm/nvram.h> @@ -30,6 +29,10 @@ extern spinlock_t rtc_lock; +#define NVRAM_AS0 0x74 +#define NVRAM_AS1 0x75 +#define NVRAM_DATA 0x77 + static int nvram_as1 = NVRAM_AS1; static int nvram_as0 = NVRAM_AS0; static int nvram_data = NVRAM_DATA; @@ -37,14 +40,21 @@ static int nvram_data = NVRAM_DATA; long __init chrp_time_init(void) { struct device_node *rtcs; + struct resource r; int base; - rtcs = find_compatible_devices("rtc", "pnpPNP,b00"); + rtcs = of_find_compatible_node(NULL, "rtc", "pnpPNP,b00"); + if (rtcs == NULL) + rtcs = of_find_compatible_node(NULL, "rtc", "ds1385-rtc"); if (rtcs == NULL) - rtcs = find_compatible_devices("rtc", "ds1385-rtc"); - if (rtcs == NULL || rtcs->addrs == NULL) return 0; - base = rtcs->addrs[0].address; + if (of_address_to_resource(rtcs, 0, &r)) { + of_node_put(rtcs); + return 0; + } + of_node_put(rtcs); + + base = r.start; nvram_as1 = 0; nvram_as0 = base; nvram_data = base + 1; @@ -88,12 +98,12 @@ int chrp_set_rtc_time(struct rtc_time *tmarg) chrp_cmos_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BIN_TO_BCD(tm.tm_sec); - BIN_TO_BCD(tm.tm_min); - BIN_TO_BCD(tm.tm_hour); - BIN_TO_BCD(tm.tm_mon); - BIN_TO_BCD(tm.tm_mday); - BIN_TO_BCD(tm.tm_year); + tm.tm_sec = bin2bcd(tm.tm_sec); + tm.tm_min = bin2bcd(tm.tm_min); + tm.tm_hour = bin2bcd(tm.tm_hour); + tm.tm_mon = bin2bcd(tm.tm_mon); + tm.tm_mday = bin2bcd(tm.tm_mday); + tm.tm_year = bin2bcd(tm.tm_year); } chrp_cmos_clock_write(tm.tm_sec,RTC_SECONDS); chrp_cmos_clock_write(tm.tm_min,RTC_MINUTES); @@ -119,41 +129,23 @@ int chrp_set_rtc_time(struct rtc_time *tmarg) void chrp_get_rtc_time(struct rtc_time *tm) { unsigned int year, mon, day, hour, min, sec; - int uip, i; - - /* The Linux interpretation of the CMOS clock register contents: - * When the Update-In-Progress (UIP) flag goes from 1 to 0, the - * RTC registers show the second which has precisely just started. - * Let's hope other operating systems interpret the RTC the same way. - */ - - /* Since the UIP flag is set for about 2.2 ms and the clock - * is typically written with a precision of 1 jiffy, trying - * to obtain a precision better than a few milliseconds is - * an illusion. Only consistency is interesting, this also - * allows to use the routine for /dev/rtc without a potential - * 1 second kernel busy loop triggered by any reader of /dev/rtc. - */ - for ( i = 0; i<1000000; i++) { - uip = chrp_cmos_clock_read(RTC_FREQ_SELECT); + do { sec = chrp_cmos_clock_read(RTC_SECONDS); min = chrp_cmos_clock_read(RTC_MINUTES); hour = chrp_cmos_clock_read(RTC_HOURS); day = chrp_cmos_clock_read(RTC_DAY_OF_MONTH); mon = chrp_cmos_clock_read(RTC_MONTH); year = chrp_cmos_clock_read(RTC_YEAR); - uip |= chrp_cmos_clock_read(RTC_FREQ_SELECT); - if ((uip & RTC_UIP)==0) break; - } + } while (sec != chrp_cmos_clock_read(RTC_SECONDS)); if (!(chrp_cmos_clock_read(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { - BCD_TO_BIN(sec); - BCD_TO_BIN(min); - BCD_TO_BIN(hour); - BCD_TO_BIN(day); - BCD_TO_BIN(mon); - BCD_TO_BIN(year); + sec = bcd2bin(sec); + min = bcd2bin(min); + hour = bcd2bin(hour); + day = bcd2bin(day); + mon = bcd2bin(mon); + year = bcd2bin(year); } if (year < 70) year += 100; @@ -164,24 +156,3 @@ void chrp_get_rtc_time(struct rtc_time *tm) tm->tm_mon = mon; tm->tm_year = year; } - - -void __init chrp_calibrate_decr(void) -{ - struct device_node *cpu; - unsigned int freq, *fp; - - /* - * The cpu node should have a timebase-frequency property - * to tell us the rate at which the decrementer counts. - */ - freq = 16666000; /* hardcoded default */ - cpu = find_type_devices("cpu"); - if (cpu != 0) { - fp = (unsigned int *) - get_property(cpu, "timebase-frequency", NULL); - if (fp != 0) - freq = *fp; - } - ppc_tb_freq = freq; -} |