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Subject[ 33/40] rtc: rtc-mv: Add support for clk to avoid lockups
Date
3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Lunn <andrew@lunn.ch>

commit 89c58c198b252f2bc20657fdd72a2aea788c435c upstream.

The Marvell RTC on Kirkwood makes use of the runit clock. Ensure the
driver clk_prepare_enable() this clock, otherwise there is a danger
the SoC will lockup when accessing RTC registers with the clock
disabled.

Reported-by: Simon Baatz <gmbnomis@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Simon Baatz <gmbnomis@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/arm/boot/dts/kirkwood.dtsi | 1 +
drivers/rtc/rtc-mv.c | 28 ++++++++++++++++++++++++----
2 files changed, 25 insertions(+), 4 deletions(-)

--- a/arch/arm/boot/dts/kirkwood.dtsi
+++ b/arch/arm/boot/dts/kirkwood.dtsi
@@ -31,6 +31,7 @@
compatible = "mrvl,kirkwood-rtc", "mrvl,orion-rtc";
reg = <0x10300 0x20>;
interrupts = <53>;
+ clocks = <&gate_clk 7>;
};
};
};
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -14,6 +14,7 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/delay.h>
+#include <linux/clk.h>
#include <linux/gfp.h>
#include <linux/module.h>

@@ -41,6 +42,7 @@ struct rtc_plat_data {
struct rtc_device *rtc;
void __iomem *ioaddr;
int irq;
+ struct clk *clk;
};

static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -221,6 +223,7 @@ static int __devinit mv_rtc_probe(struct
struct rtc_plat_data *pdata;
resource_size_t size;
u32 rtc_time;
+ int ret = 0;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
@@ -239,11 +242,17 @@ static int __devinit mv_rtc_probe(struct
if (!pdata->ioaddr)
return -ENOMEM;

+ pdata->clk = devm_clk_get(&pdev->dev, NULL);
+ /* Not all SoCs require a clock.*/
+ if (!IS_ERR(pdata->clk))
+ clk_prepare_enable(pdata->clk);
+
/* make sure the 24 hours mode is enabled */
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
if (rtc_time & RTC_HOURS_12H_MODE) {
dev_err(&pdev->dev, "24 Hours mode not supported.\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}

/* make sure it is actually functional */
@@ -252,7 +261,8 @@ static int __devinit mv_rtc_probe(struct
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
if (rtc_time == 0x01000000) {
dev_err(&pdev->dev, "internal RTC not ticking\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto out;
}
}

@@ -268,8 +278,10 @@ static int __devinit mv_rtc_probe(struct
} else
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
&mv_rtc_ops, THIS_MODULE);
- if (IS_ERR(pdata->rtc))
- return PTR_ERR(pdata->rtc);
+ if (IS_ERR(pdata->rtc)) {
+ ret = PTR_ERR(pdata->rtc);
+ goto out;
+ }

if (pdata->irq >= 0) {
writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
@@ -282,6 +294,11 @@ static int __devinit mv_rtc_probe(struct
}

return 0;
+out:
+ if (!IS_ERR(pdata->clk))
+ clk_disable_unprepare(pdata->clk);
+
+ return ret;
}

static int __exit mv_rtc_remove(struct platform_device *pdev)
@@ -292,6 +309,9 @@ static int __exit mv_rtc_remove(struct p
device_init_wakeup(&pdev->dev, 0);

rtc_device_unregister(pdata->rtc);
+ if (!IS_ERR(pdata->clk))
+ clk_disable_unprepare(pdata->clk);
+
return 0;
}




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