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>

diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 50f9f10..867c8a7 100644 (file)
--- 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 4179850..6fc9614 100644 (file)
--- 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;
 };