1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index d72c450aebe5..60f57e2abf21 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -1737,6 +1737,39 @@ pmu_enable_irled(int on)
         pmu_wait_complete(&req);
 }
 
+/* Offset between Unix time (1970-based) and Mac time (1904-based) */
+#define RTC_OFFSET      2082844800
+
+time64_t pmu_get_time(void)
+{
+        struct adb_request req;
+        u32 now;
+
+        if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
+                return 0;
+        pmu_wait_complete(&req);
+        if (req.reply_len != 4)
+                pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
+        now = (req.reply[0] << 24) + (req.reply[1] << 16) +
+              (req.reply[2] << 8) + req.reply[3];
+        return (time64_t)now - RTC_OFFSET;
+}
+
+int pmu_set_rtc_time(struct rtc_time *tm)
+{
+        u32 now;
+        struct adb_request req;
+
+        now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
+        if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
+                        now >> 24, now >> 16, now >> 8, now) < 0)
+                return -ENXIO;
+        pmu_wait_complete(&req);
+        if (req.reply_len != 0)
+                pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
+        return 0;
+}
+
 void
 pmu_restart(void)
 {