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path: root/drivers/rtc/rtc-at91sam9.c
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Diffstat (limited to 'drivers/rtc/rtc-at91sam9.c')
-rw-r--r--drivers/rtc/rtc-at91sam9.c85
1 files changed, 28 insertions, 57 deletions
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 274a0aafe42b..831868904e02 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -57,6 +57,7 @@ struct sam9_rtc {
void __iomem *rtt;
struct rtc_device *rtcdev;
u32 imr;
+ void __iomem *gpbr;
};
#define rtt_readl(rtc, field) \
@@ -65,9 +66,9 @@ struct sam9_rtc {
__raw_writel((val), (rtc)->rtt + AT91_RTT_ ## field)
#define gpbr_readl(rtc) \
- at91_sys_read(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR)
+ __raw_readl((rtc)->gpbr)
#define gpbr_writel(rtc, val) \
- at91_sys_write(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR, (val))
+ __raw_writel((val), (rtc)->gpbr)
/*
* Read current time and date in RTC
@@ -287,16 +288,19 @@ static const struct rtc_class_ops at91_rtc_ops = {
/*
* Initialize and install RTC driver
*/
-static int __init at91_rtc_probe(struct platform_device *pdev)
+static int __devinit at91_rtc_probe(struct platform_device *pdev)
{
- struct resource *r;
+ struct resource *r, *r_gpbr;
struct sam9_rtc *rtc;
int ret;
u32 mr;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!r)
+ r_gpbr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!r || !r_gpbr) {
+ dev_err(&pdev->dev, "need 2 ressources\n");
return -ENODEV;
+ }
rtc = kzalloc(sizeof *rtc, GFP_KERNEL);
if (!rtc)
@@ -314,6 +318,13 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
goto fail;
}
+ rtc->gpbr = ioremap(r_gpbr->start, resource_size(r_gpbr));
+ if (!rtc->gpbr) {
+ dev_err(&pdev->dev, "failed to map gpbr registers, aborting.\n");
+ ret = -ENOMEM;
+ goto fail_gpbr;
+ }
+
mr = rtt_readl(rtc, MR);
/* unless RTT is counting at 1 Hz, re-initialize it */
@@ -340,7 +351,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
if (ret) {
dev_dbg(&pdev->dev, "can't share IRQ %d?\n", AT91_ID_SYS);
rtc_device_unregister(rtc->rtcdev);
- goto fail;
+ goto fail_register;
}
/* NOTE: sam9260 rev A silicon has a ROM bug which resets the
@@ -356,6 +367,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
return 0;
fail_register:
+ iounmap(rtc->gpbr);
+fail_gpbr:
iounmap(rtc->rtt);
fail:
platform_set_drvdata(pdev, NULL);
@@ -366,7 +379,7 @@ fail:
/*
* Disable and remove the RTC driver
*/
-static int __exit at91_rtc_remove(struct platform_device *pdev)
+static int __devexit at91_rtc_remove(struct platform_device *pdev)
{
struct sam9_rtc *rtc = platform_get_drvdata(pdev);
u32 mr = rtt_readl(rtc, MR);
@@ -377,6 +390,7 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
rtc_device_unregister(rtc->rtcdev);
+ iounmap(rtc->gpbr);
iounmap(rtc->rtt);
platform_set_drvdata(pdev, NULL);
kfree(rtc);
@@ -440,63 +454,20 @@ static int at91_rtc_resume(struct platform_device *pdev)
#endif
static struct platform_driver at91_rtc_driver = {
- .driver.name = "rtc-at91sam9",
- .driver.owner = THIS_MODULE,
- .remove = __exit_p(at91_rtc_remove),
+ .probe = at91_rtc_probe,
+ .remove = __devexit_p(at91_rtc_remove),
.shutdown = at91_rtc_shutdown,
.suspend = at91_rtc_suspend,
.resume = at91_rtc_resume,
+ .driver = {
+ .name = "rtc-at91sam9",
+ .owner = THIS_MODULE,
+ },
};
-/* Chips can have more than one RTT module, and they can be used for more
- * than just RTCs. So we can't just register as "the" RTT driver.
- *
- * A normal approach in such cases is to create a library to allocate and
- * free the modules. Here we just use bus_find_device() as like such a
- * library, binding directly ... no runtime "library" footprint is needed.
- */
-static int __init at91_rtc_match(struct device *dev, void *v)
-{
- struct platform_device *pdev = to_platform_device(dev);
- int ret;
-
- /* continue searching if this isn't the RTT we need */
- if (strcmp("at91_rtt", pdev->name) != 0
- || pdev->id != CONFIG_RTC_DRV_AT91SAM9_RTT)
- goto fail;
-
- /* else we found it ... but fail unless we can bind to the RTC driver */
- if (dev->driver) {
- dev_dbg(dev, "busy, can't use as RTC!\n");
- goto fail;
- }
- dev->driver = &at91_rtc_driver.driver;
- if (device_attach(dev) == 0) {
- dev_dbg(dev, "can't attach RTC!\n");
- goto fail;
- }
- ret = at91_rtc_probe(pdev);
- if (ret == 0)
- return true;
-
- dev_dbg(dev, "RTC probe err %d!\n", ret);
-fail:
- return false;
-}
-
static int __init at91_rtc_init(void)
{
- int status;
- struct device *rtc;
-
- status = platform_driver_register(&at91_rtc_driver);
- if (status)
- return status;
- rtc = bus_find_device(&platform_bus_type, NULL,
- NULL, at91_rtc_match);
- if (!rtc)
- platform_driver_unregister(&at91_rtc_driver);
- return rtc ? 0 : -ENODEV;
+ return platform_driver_register(&at91_rtc_driver);
}
module_init(at91_rtc_init);