Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Setup code for PC-style Real-Time Clock.
3 *
4 * Author: Wade Farnsworth <wfarnsworth@mvista.com>
5 *
6 * 2007 (c) MontaVista Software, Inc. This file is licensed under
7 * the terms of the GNU General Public License version 2. This program
8 * is licensed "as is" without any warranty of any kind, whether express
9 * or implied.
10 */
11
12#include <linux/platform_device.h>
13#include <linux/err.h>
14#include <linux/init.h>
15#include <linux/mc146818rtc.h>
16
17#include <asm/prom.h>
18
19static int __init add_rtc(void)
20{
21 struct device_node *np;
22 struct platform_device *pd;
23 struct resource res[2];
24 int ret;
25
26 memset(&res, 0, sizeof(res));
27
28 np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
29 if (!np)
30 return -ENODEV;
31
32 ret = of_address_to_resource(np, 0, &res[0]);
33 of_node_put(np);
34 if (ret)
35 return ret;
36
37 /*
38 * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h. Verify that the
39 * address provided by the device node matches.
40 */
41 if (res[0].start != RTC_PORT(0))
42 return -EINVAL;
43
44 /* Use a fixed interrupt value of 8 since on PPC if we are using this
45 * its off an i8259 which we ensure has interrupt numbers 0..15. */
46 res[1].start = 8;
47 res[1].end = 8;
48 res[1].flags = IORESOURCE_IRQ;
49
50 pd = platform_device_register_simple("rtc_cmos", -1,
51 &res[0], 2);
52
53 if (IS_ERR(pd))
54 return PTR_ERR(pd);
55
56 return 0;
57}
58fs_initcall(add_rtc);
59
60MODULE_LICENSE("GPL");