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[ARM] Kirkwood: fail the probe if internal RTC does not work

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Having a RTC that doesn't maintain proper time across a reboot is one
thing.  But a RTC that doesn't work at all and only causes timeouts is
another.

Tested-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre 2009-03-23 20:42:29 -04:00
parent 0c1355e36f
commit 9d1d4f9eab
1 changed files with 11 additions and 0 deletions
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11
drivers/rtc/rtc-mv.c
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@ -12,6 +12,7 @@
#include <linux/bcd.h> #include <linux/bcd.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/delay.h>
#define RTC_TIME_REG_OFFS 0 #define RTC_TIME_REG_OFFS 0
@ -119,6 +120,16 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
return -EINVAL; return -EINVAL;
} }
/* make sure it is actually functional */
if (rtc_time == 0x01000000) {
ssleep(1);
rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
if (rtc_time == 0x01000000) {
dev_err(&pdev->dev, "internal RTC not ticking\n");
return -ENODEV;
}
}
platform_set_drvdata(pdev, pdata); platform_set_drvdata(pdev, pdata);
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev, pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
&mv_rtc_ops, THIS_MODULE); &mv_rtc_ops, THIS_MODULE);