rtc: davinci: replace 32bit access with 8bit access

Use 32-bit access only where it is needed. Most of the RTC registers
contain useful information in the 8 least significant bits, the others
are reserved.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210602203805.11494-4-dariobin@libero.it

diff --git a/drivers/rtc/davinci.c b/drivers/rtc/davinci.c
index 8f5f76c..99ae31e 100644 (file)
--- a/drivers/rtc/davinci.c
+++ b/drivers/rtc/davinci.c
@@ -22,7 +22,7 @@ int rtc_get(struct rtc_time *tmp)
        unsigned long sec, min, hour, mday, wday, mon_cent, year;
        unsigned long status;
 
-       status = readl(&rtc->status);
+       status = readb(&rtc->status);
        if ((status & RTC_STATE_RUN) != RTC_STATE_RUN) {
                printf("RTC doesn't run\n");
                return -1;
@@ -30,13 +30,13 @@ int rtc_get(struct rtc_time *tmp)
        if ((status & RTC_STATE_BUSY) == RTC_STATE_BUSY)
                udelay(20);
 
-       sec     = readl(&rtc->second);
-       min     = readl(&rtc->minutes);
-       hour    = readl(&rtc->hours);
-       mday    = readl(&rtc->day);
-       wday    = readl(&rtc->dotw);
-       mon_cent = readl(&rtc->month);
-       year    = readl(&rtc->year);
+       sec     = readb(&rtc->second);
+       min     = readb(&rtc->minutes);
+       hour    = readb(&rtc->hours);
+       mday    = readb(&rtc->day);
+       wday    = readb(&rtc->dotw);
+       mon_cent = readb(&rtc->month);
+       year    = readb(&rtc->year);
 
        debug("Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
                "hr: %02lx min: %02lx sec: %02lx\n",
@@ -67,14 +67,14 @@ int rtc_set(struct rtc_time *tmp)
        debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
-       writel(bin2bcd(tmp->tm_year % 100), &rtc->year);
-       writel(bin2bcd(tmp->tm_mon), &rtc->month);
+       writeb(bin2bcd(tmp->tm_year % 100), &rtc->year);
+       writeb(bin2bcd(tmp->tm_mon), &rtc->month);
 
-       writel(bin2bcd(tmp->tm_wday), &rtc->dotw);
-       writel(bin2bcd(tmp->tm_mday), &rtc->day);
-       writel(bin2bcd(tmp->tm_hour), &rtc->hours);
-       writel(bin2bcd(tmp->tm_min), &rtc->minutes);
-       writel(bin2bcd(tmp->tm_sec), &rtc->second);
+       writeb(bin2bcd(tmp->tm_wday), &rtc->dotw);
+       writeb(bin2bcd(tmp->tm_mday), &rtc->day);
+       writeb(bin2bcd(tmp->tm_hour), &rtc->hours);
+       writeb(bin2bcd(tmp->tm_min), &rtc->minutes);
+       writeb(bin2bcd(tmp->tm_sec), &rtc->second);
        return 0;
 }
 
@@ -83,5 +83,5 @@ void rtc_reset(void)
        struct davinci_rtc *rtc = (struct davinci_rtc *)RTC_BASE;
 
        /* run RTC counter */
-       writel(0x01, &rtc->ctrl);
+       writeb(0x01, &rtc->ctrl);
 }