[PULL 19/23] hw/rtc/ls7a_rtc: Fix rtc enable and disable function

From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Subject: [PULL 19/23] hw/rtc/ls7a_rtc: Fix rtc enable and disable function
Date: Mon,  4 Jul 2022 15:03:53 +0530	[thread overview]
Message-ID: <20220704093357.983255-20-richard.henderson@linaro.org> (raw)
In-Reply-To: <20220704093357.983255-1-richard.henderson@linaro.org>

From: Xiaojuan Yang <yangxiaojuan@loongson.cn>

Fix ls7a rtc enable and disable function. When rtc disabled, it do
not support to read or write, but the real time is still continue,
so we need not neither save the time nor update the rtc offset.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220701093407.2150607-6-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 hw/rtc/ls7a_rtc.c | 60 ++++++-----------------------------------------
 1 file changed, 7 insertions(+), 53 deletions(-)

diff --git a/hw/rtc/ls7a_rtc.c b/hw/rtc/ls7a_rtc.c
index eb10cdb451..a36aeea9dd 100644
--- a/hw/rtc/ls7a_rtc.c
+++ b/hw/rtc/ls7a_rtc.c
@@ -72,9 +72,6 @@ struct LS7ARtcState {
      */
     int64_t offset_toy;
     int64_t offset_rtc;
-    uint64_t save_toy_mon;
-    uint64_t save_toy_year;
-    uint64_t save_rtc;
     int64_t data;
     int tidx;
     uint32_t toymatch[3];
@@ -140,14 +137,6 @@ static inline uint64_t toy_time_to_val_mon(struct tm tm)
     return val;
 }
 
-static inline uint64_t toy_time_to_val_year(struct tm tm)
-{
-    uint64_t year;
-
-    year = tm.tm_year;
-    return year;
-}
-
 static inline void toymatch_val_to_time(LS7ARtcState *s, uint64_t val, struct tm *tm)
 {
     qemu_get_timedate(tm, s->offset_toy);
@@ -191,14 +180,6 @@ static void rtcmatch_write(LS7ARtcState *s, uint64_t val, int num)
 static void ls7a_toy_stop(LS7ARtcState *s)
 {
     int i;
-    struct tm tm;
-    /*
-     * save time when disabled toy,
-     * because toy time not add counters.
-     */
-    qemu_get_timedate(&tm, s->offset_toy);
-    s->save_toy_mon = toy_time_to_val_mon(tm);
-    s->save_toy_year = toy_time_to_val_year(tm);
 
     /* delete timers, and when re-enabled, recaculate expire time */
     for (i = 0; i < TIMER_NUMS; i++) {
@@ -209,11 +190,6 @@ static void ls7a_toy_stop(LS7ARtcState *s)
 static void ls7a_rtc_stop(LS7ARtcState *s)
 {
     int i;
-    uint64_t time;
-
-    /* save rtc time */
-    time = ls7a_rtc_ticks() + s->offset_rtc;
-    s->save_rtc = time;
 
     /* delete timers, and when re-enabled, recaculate expire time */
     for (i = 0; i < TIMER_NUMS; i++) {
@@ -226,14 +202,7 @@ static void ls7a_toy_start(LS7ARtcState *s)
     int i;
     uint64_t expire_time, now;
     struct tm tm = {};
-    /*
-     * need to recaculate toy offset
-     * and expire time when enable it.
-     */
-    toy_val_to_time_mon(s->save_toy_mon, &tm);
-    toy_val_to_time_year(s->save_toy_year, &tm);
 
-    s->offset_toy = qemu_timedate_diff(&tm);
     now = qemu_clock_get_ms(rtc_clock);
 
     /* recaculate expire time and enable timer */
@@ -247,14 +216,7 @@ static void ls7a_toy_start(LS7ARtcState *s)
 static void ls7a_rtc_start(LS7ARtcState *s)
 {
     int i;
-    uint64_t expire_time, now;
-
-    /*
-     * need to recaculate rtc offset
-     * and expire time when enable it.
-     */
-    now = ls7a_rtc_ticks();
-    s->offset_rtc = s->save_rtc - now;
+    uint64_t expire_time;
 
     /* recaculate expire time and enable timer */
     for (i = 0; i < TIMER_NUMS; i++) {
@@ -271,23 +233,21 @@ static uint64_t ls7a_rtc_read(void *opaque, hwaddr addr, unsigned size)
 
     switch (addr) {
     case SYS_TOYREAD0:
-        /* if toy disabled, read save toy time */
         if (toy_enabled(s)) {
             qemu_get_timedate(&tm, s->offset_toy);
             val = toy_time_to_val_mon(tm);
         } else {
-            /* read save mon val */
-            val = s->save_toy_mon;
+            /* return 0 when toy disabled */
+            val = 0;
         }
         break;
     case SYS_TOYREAD1:
-        /* if toy disabled, read save toy time */
         if (toy_enabled(s)) {
             qemu_get_timedate(&tm, s->offset_toy);
             val = tm.tm_year;
         } else {
-            /* read save year val */
-            val = s->save_toy_year;
+            /* return 0 when toy disabled */
+            val = 0;
         }
         break;
     case SYS_TOYMATCH0:
@@ -303,11 +263,11 @@ static uint64_t ls7a_rtc_read(void *opaque, hwaddr addr, unsigned size)
         val = s->cntrctl;
         break;
     case SYS_RTCREAD0:
-        /* if rtc disabled, read save rtc time */
         if (rtc_enabled(s)) {
             val = ls7a_rtc_ticks() + s->offset_rtc;
         } else {
-            val = s->save_rtc;
+            /* return 0 when rtc disabled */
+            val = 0;
         }
         break;
     case SYS_RTCMATCH0:
@@ -457,9 +417,6 @@ static void ls7a_rtc_realize(DeviceState *dev, Error **errp)
     }
     d->offset_toy = 0;
     d->offset_rtc = 0;
-    d->save_toy_mon = 0;
-    d->save_toy_year = 0;
-    d->save_rtc = 0;
 
 }
 
@@ -515,9 +472,6 @@ static const VMStateDescription vmstate_ls7a_rtc = {
     .fields = (VMStateField[]) {
         VMSTATE_INT64(offset_toy, LS7ARtcState),
         VMSTATE_INT64(offset_rtc, LS7ARtcState),
-        VMSTATE_UINT64(save_toy_mon, LS7ARtcState),
-        VMSTATE_UINT64(save_toy_year, LS7ARtcState),
-        VMSTATE_UINT64(save_rtc, LS7ARtcState),
         VMSTATE_UINT32_ARRAY(toymatch, LS7ARtcState, TIMER_NUMS),
         VMSTATE_UINT32_ARRAY(rtcmatch, LS7ARtcState, TIMER_NUMS),
         VMSTATE_UINT32(cntrctl, LS7ARtcState),
-- 
2.34.1


