70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
|
/*
|
||
|
|
* 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/module.h>
|
||
|
|
#include <linux/mc146818rtc.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
|
||
|
|
|
||
|
|
static int __init add_rtc(void)
|
||
|
|
{
|
||
|
|
struct device_node *np;
|
||
|
|
struct platform_device *pd;
|
||
|
|
struct resource res[2];
|
||
|
|
unsigned int num_res = 1;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
memset(&res, 0, sizeof(res));
|
||
|
|
|
||
|
|
np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
|
||
|
|
if (!np)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
ret = of_address_to_resource(np, 0, &res[0]);
|
||
|
|
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[0].start != RTC_PORT(0))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
np = of_find_compatible_node(NULL, NULL, "chrp,iic");
|
||
|
|
if (!np)
|
||
|
|
np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
|
||
|
|
if (np) {
|
||
|
|
of_node_put(np);
|
||
|
|
/*
|
||
|
|
* Use a fixed interrupt value of 8 since on PPC if we are
|
||
|
|
* using this its off an i8259 which we ensure has interrupt
|
||
|
|
* numbers 0..15.
|
||
|
|
*/
|
||
|
|
res[1].start = 8;
|
||
|
|
res[1].end = 8;
|
||
|
|
res[1].flags = IORESOURCE_IRQ;
|
||
|
|
num_res++;
|
||
|
|
}
|
||
|
|
|
||
|
|
pd = platform_device_register_simple("rtc_cmos", -1,
|
||
|
|
&res[0], num_res);
|
||
|
|
|
||
|
|
return PTR_ERR_OR_ZERO(pd);
|
||
|
|
}
|
||
|
|
fs_initcall(add_rtc);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|