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ARM: at91/rtc-at91sam9: pass the GPBR to use via resources

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The GPBR registers are used for storing RTC values. The GPBR registers
to use are now provided using standard resource entry. The array is
filled in SoC specific code.
rtc-at91sam9 RTT as RTC driver is modified to retrieve this information.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[nicolas.ferre@atmel.com: rework resources assignment]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Ryan Mallon <rmallon@gmail.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-02-15 21:24:46 +08:00 • committed by Nicolas Ferre
parent 4e9267f1b4
commit b3af8b49be
11 changed files with 114 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

24
drivers/rtc/rtc-at91sam9.c
View file

@ -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
@ -289,14 +290,17 @@ static const struct rtc_class_ops at91_rtc_ops = {
*/
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 __devinit 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 __devinit 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 __devinit 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);
@ -377,6 +390,7 @@ static int __devexit 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);