diff options
Diffstat (limited to 'arch/powerpc/platforms/powermac/time.c')
| -rw-r--r-- | arch/powerpc/platforms/powermac/time.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/powerpc/platforms/powermac/time.c b/arch/powerpc/platforms/powermac/time.c index 7c968e46736f..12e6e4d30602 100644 --- a/arch/powerpc/platforms/powermac/time.c +++ b/arch/powerpc/platforms/powermac/time.c @@ -42,7 +42,11 @@ #define DBG(x...) #endif -/* Apparently the RTC stores seconds since 1 Jan 1904 */ +/* + * Offset between Unix time (1970-based) and Mac time (1904-based). Cuda and PMU + * times wrap in 2040. If we need to handle later times, the read_time functions + * need to be changed to interpret wrapped times as post-2040. + */ #define RTC_OFFSET 2082844800 /* @@ -97,8 +101,11 @@ static time64_t cuda_get_time(void) if (req.reply_len != 7) printk(KERN_ERR "cuda_get_time: got %d byte reply\n", req.reply_len); - now = (req.reply[3] << 24) + (req.reply[4] << 16) - + (req.reply[5] << 8) + req.reply[6]; + now = (u32)((req.reply[3] << 24) + (req.reply[4] << 16) + + (req.reply[5] << 8) + req.reply[6]); + /* it's either after year 2040, or the RTC has gone backwards */ + WARN_ON(now < RTC_OFFSET); + return now - RTC_OFFSET; } @@ -106,10 +113,10 @@ static time64_t cuda_get_time(void) static int cuda_set_rtc_time(struct rtc_time *tm) { - time64_t nowtime; + u32 nowtime; struct adb_request req; - nowtime = rtc_tm_to_time64(tm) + RTC_OFFSET; + nowtime = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET); if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME, nowtime >> 24, nowtime >> 16, nowtime >> 8, nowtime) < 0) @@ -140,8 +147,12 @@ static time64_t pmu_get_time(void) if (req.reply_len != 4) printk(KERN_ERR "pmu_get_time: got %d byte reply from PMU\n", req.reply_len); - now = (req.reply[0] << 24) + (req.reply[1] << 16) - + (req.reply[2] << 8) + req.reply[3]; + now = (u32)((req.reply[0] << 24) + (req.reply[1] << 16) + + (req.reply[2] << 8) + req.reply[3]); + + /* it's either after year 2040, or the RTC has gone backwards */ + WARN_ON(now < RTC_OFFSET); + return now - RTC_OFFSET; } @@ -149,10 +160,10 @@ static time64_t pmu_get_time(void) static int pmu_set_rtc_time(struct rtc_time *tm) { - time64_t nowtime; + u32 nowtime; struct adb_request req; - nowtime = rtc_tm_to_time64(tm) + RTC_OFFSET; + nowtime = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET); if (pmu_request(&req, NULL, 5, PMU_SET_RTC, nowtime >> 24, nowtime >> 16, nowtime >> 8, nowtime) < 0) return -ENXIO; |