ARM: at91:rtc/rtc-at91sam9: ioremap register bank

Instead of computing virtual address with AT91_VA_BASE_SYS, use the
appropriate ioremap() call on the driver "memory" resource.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index a3ad957507dc..ee3c122c0599 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -307,8 +307,12 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
                 device_init_wakeup(&pdev->dev, 1);
 
         platform_set_drvdata(pdev, rtc);
-        rtc->rtt = (void __force __iomem *) (AT91_VA_BASE_SYS - AT91_BASE_SYS);
-        rtc->rtt += r->start;
+        rtc->rtt = ioremap(r->start, resource_size(r));
+        if (!rtc->rtt) {
+                dev_err(&pdev->dev, "failed to map registers, aborting.\n");
+                ret = -ENOMEM;
+                goto fail;
+        }
 
         mr = rtt_readl(rtc, MR);
 
@@ -326,7 +330,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
                                 &at91_rtc_ops, THIS_MODULE);
         if (IS_ERR(rtc->rtcdev)) {
                 ret = PTR_ERR(rtc->rtcdev);
-                goto fail;
+                goto fail_register;
         }
 
         /* register irq handler after we know what name we'll use */
@@ -351,6 +355,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 
         return 0;
 
+fail_register:
+        iounmap(rtc->rtt);
 fail:
         platform_set_drvdata(pdev, NULL);
         kfree(rtc);
@@ -371,6 +377,7 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
 
         rtc_device_unregister(rtc->rtcdev);
 
+        iounmap(rtc->rtt);
         platform_set_drvdata(pdev, NULL);
         kfree(rtc);
         return 0;