sparc64: fix wrong m48t59 RTC year

Correctly calculate offset to the year register for
Mostek RTC.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index 209e7d28c3a5..226a0042d870 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -500,6 +500,7 @@ static struct of_platform_driver bq4802_driver = {
 static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 {
         struct platform_device *pdev = to_platform_device(dev);
+        struct m48t59_plat_data *pdata = pdev->dev.platform_data;
         void __iomem *regs;
         unsigned char val;
 
@@ -507,7 +508,7 @@ static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
         val = readb(regs + ofs);
 
         /* the year 0 is 1968 */
-        if (ofs == M48T59_YEAR) {
+        if (ofs == pdata->offset + M48T59_YEAR) {
                 val += 0x68;
                 if ((val & 0xf) > 9)
                         val += 6;
@@ -518,10 +519,11 @@ static unsigned char mostek_read_byte(struct device *dev, u32 ofs)
 static void mostek_write_byte(struct device *dev, u32 ofs, u8 val)
 {
         struct platform_device *pdev = to_platform_device(dev);
+        struct m48t59_plat_data *pdata = pdev->dev.platform_data;
         void __iomem *regs;
 
         regs = (void __iomem *) pdev->resource[0].start;
-        if (ofs == M48T59_YEAR) {
+        if (ofs == pdata->offset + M48T59_YEAR) {
                 if (val < 0x68)
                         val += 0x32;
                 else