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[POWERPC] Create add_rtc() function to enable the RTC CMOS driver

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In order to use the RTC CMOS driver, each architecture must register a
platform device for the RTC.

This creates a function to register the platform device based on the RTC
device node and verifies that the RTC port against the hard-coded value
in asm/mc146818rtc.h.

Signed-off-by: Wade Farnsworth <wfarnsworth@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Wade Farnsworth 2007-07-11 02:55:46 +10:00 committed by Paul Mackerras
parent 3c0c9e389b
commit 93ab471889
2 changed files with 50 additions and 0 deletions
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1
arch/powerpc/sysdev/Makefile
View file

@ -16,6 +16,7 @@ obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
mv64x60-$(CONFIG_PCI) += mv64x60_pci.o
obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc_cmos_setup.o
# contains only the suspend handler for time
ifeq ($(CONFIG_RTC_CLASS),)

49
arch/powerpc/sysdev/rtc_cmos_setup.c Normal file
View file

@ -0,0 +1,49 @@
/*
* Setup code for PC-style Real-Time Clock.
*
* Author: Wade Farnsworth <wfarnsworth@mvista.com>
*
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mc146818rtc.h>
#include <asm/prom.h>
static int __init add_rtc(void)
{
struct device_node *np;
struct platform_device *pd;
struct resource res;
int ret;
np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
if (!np)
return -ENODEV;
ret = of_address_to_resource(np, 0, &res);
of_node_put(np);
if (ret)
return ret;
/*
* RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the
* address provided by the device node matches.
*/
if (res.start != RTC_PORT(0))
return -EINVAL;
pd = platform_device_register_simple("rtc_cmos", -1,
&res, 1);
if (IS_ERR(pd))
return PTR_ERR(pd);
return 0;
}
fs_initcall(add_rtc);