drivers/rtc/rtc-mpc5121.c: add support for RTC on MPC5200

MPC5200B contains a limited version of RTC from MPC5121.  Add support for
the RTC on that CPU.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 75 insertions, 10 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index dcb61e23b985..55affcdc4641 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1006,10 +1006,10 @@ config RTC_DRV_MC13XXX
 
 config RTC_DRV_MPC5121
         tristate "Freescale MPC5121 built-in RTC"
-        depends on PPC_MPC512x && RTC_CLASS
+        depends on PPC_MPC512x || PPC_MPC52xx
         help
           If you say yes here you will get support for the
-          built-in RTC MPC5121.
+          built-in RTC on MPC5121 or on MPC5200.
 
           This driver can also be built as a module. If so, the module
           will be called rtc-mpc5121.
diff --git a/drivers/rtc/rtc-mpc5121.c b/drivers/rtc/rtc-mpc5121.c
index 09ccd8d3ba2a..da60915818b6 100644
--- a/drivers/rtc/rtc-mpc5121.c
+++ b/drivers/rtc/rtc-mpc5121.c
@@ -3,6 +3,7 @@
  *
  * Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
  * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
+ * Copyright 2011, Dmitry Eremin-Solenikov
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -145,6 +146,55 @@ static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
         return 0;
 }
 
+static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
+        struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
+        int tmp;
+
+        tm->tm_sec = in_8(&regs->second);
+        tm->tm_min = in_8(&regs->minute);
+
+        /* 12 hour format? */
+        if (in_8(&regs->hour) & 0x20)
+                tm->tm_hour = (in_8(&regs->hour) >> 1) +
+                        (in_8(&regs->hour) & 1 ? 12 : 0);
+        else
+                tm->tm_hour = in_8(&regs->hour);
+
+        tmp = in_8(&regs->wday_mday);
+        tm->tm_mday = tmp & 0x1f;
+        tm->tm_mon = in_8(&regs->month) - 1;
+        tm->tm_year = in_be16(&regs->year) - 1900;
+        tm->tm_wday = (tmp >> 5) % 7;
+        tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
+        tm->tm_isdst = 0;
+
+        return 0;
+}
+
+static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
+        struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
+
+        mpc5121_rtc_update_smh(regs, tm);
+
+        /* date */
+        out_8(&regs->month_set, tm->tm_mon + 1);
+        out_8(&regs->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
+        out_8(&regs->date_set, tm->tm_mday);
+        out_be16(&regs->year_set, tm->tm_year + 1900);
+
+        /* set date sequence */
+        out_8(&regs->set_date, 0x1);
+        out_8(&regs->set_date, 0x3);
+        out_8(&regs->set_date, 0x1);
+        out_8(&regs->set_date, 0x0);
+
+        return 0;
+}
+
 static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
         struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
@@ -248,11 +298,18 @@ static const struct rtc_class_ops mpc5121_rtc_ops = {
         .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
 };
 
+static const struct rtc_class_ops mpc5200_rtc_ops = {
+        .read_time = mpc5200_rtc_read_time,
+        .set_time = mpc5200_rtc_set_time,
+        .read_alarm = mpc5121_rtc_read_alarm,
+        .set_alarm = mpc5121_rtc_set_alarm,
+        .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
+};
+
 static int __devinit mpc5121_rtc_probe(struct platform_device *op)
 {
         struct mpc5121_rtc_data *rtc;
         int err = 0;
-        u32 ka;
 
         rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
         if (!rtc)
@@ -287,15 +344,22 @@ static int __devinit mpc5121_rtc_probe(struct platform_device *op)
                 goto out_dispose2;
         }
 
-        ka = in_be32(&rtc->regs->keep_alive);
-        if (ka & 0x02) {
-                dev_warn(&op->dev,
-                        "mpc5121-rtc: Battery or oscillator failure!\n");
-                out_be32(&rtc->regs->keep_alive, ka);
+        if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
+                u32 ka;
+                ka = in_be32(&rtc->regs->keep_alive);
+                if (ka & 0x02) {
+                        dev_warn(&op->dev,
+                                "mpc5121-rtc: Battery or oscillator failure!\n");
+                        out_be32(&rtc->regs->keep_alive, ka);
+                }
+
+                rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
+                                                &mpc5121_rtc_ops, THIS_MODULE);
+        } else {
+                rtc->rtc = rtc_device_register("mpc5200-rtc", &op->dev,
+                                                &mpc5200_rtc_ops, THIS_MODULE);
         }
 
-        rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
-                                        &mpc5121_rtc_ops, THIS_MODULE);
         if (IS_ERR(rtc->rtc)) {
                 err = PTR_ERR(rtc->rtc);
                 goto out_free_irq;
@@ -340,6 +404,7 @@ static int __devexit mpc5121_rtc_remove(struct platform_device *op)
 
 static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
         { .compatible = "fsl,mpc5121-rtc", },
+        { .compatible = "fsl,mpc5200-rtc", },
         {},
 };