rtc-m48t59: allow externally mapped ioaddr

Add support for externally mapped ioaddr.  This is required on sparc32
as the ioaddr must be mapped with of_ioremap().

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

2 files changed, 12 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 50f9f10b32f0..867c8a79a6a8 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -411,9 +411,14 @@ static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
         if (!m48t59)
                 return -ENOMEM;
 
-        m48t59->ioaddr = ioremap(res->start, res->end - res->start + 1);
-        if (!m48t59->ioaddr)
-                goto out;
+        m48t59->ioaddr = pdata->ioaddr;
+
+        if (!m48t59->ioaddr) {
+                /* ioaddr not mapped externally */
+                m48t59->ioaddr = ioremap(res->start, res->end - res->start + 1);
+                if (!m48t59->ioaddr)
+                        goto out;
+        }
 
         /* Try to get irq number. We also can work in
          * the mode without IRQ.
@@ -481,11 +486,12 @@ out:
 static int __devexit m48t59_rtc_remove(struct platform_device *pdev)
 {
         struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+        struct m48t59_plat_data *pdata = pdev->dev.platform_data;
 
         sysfs_remove_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
         if (!IS_ERR(m48t59->rtc))
                 rtc_device_unregister(m48t59->rtc);
-        if (m48t59->ioaddr)
+        if (m48t59->ioaddr && !pdata->ioaddr)
                 iounmap(m48t59->ioaddr);
         if (m48t59->irq != NO_IRQ)
                 free_irq(m48t59->irq, &pdev->dev);
diff --git a/include/linux/rtc/m48t59.h b/include/linux/rtc/m48t59.h
index 41798505d157..6fc961459b4a 100644
--- a/include/linux/rtc/m48t59.h
+++ b/include/linux/rtc/m48t59.h
@@ -55,6 +55,8 @@ struct m48t59_plat_data {
 
         int type; /* RTC model */
 
+        /* ioaddr mapped externally */
+        void __iomem *ioaddr;
         /* offset to RTC registers, automatically set according to the type */
         unsigned int offset;
 };