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/module.h>
16#include <linux/mc146818rtc.h>
17#include <linux/of_address.h>
18
19
20static int  __init add_rtc(void)
21{
22	struct device_node *np;
23	struct platform_device *pd;
24	struct resource res[2];
25	unsigned int num_res = 1;
26	int ret;
27
28	memset(&res, 0, sizeof(res));
29
30	np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
31	if (!np)
32		return -ENODEV;
33
34	ret = of_address_to_resource(np, 0, &res[0]);
35	of_node_put(np);
36	if (ret)
37		return ret;
38
39	/*
40	 * RTC_PORT(x) is hardcoded in asm/mc146818rtc.h.  Verify that the
41	 * address provided by the device node matches.
42	 */
43	if (res[0].start != RTC_PORT(0))
44		return -EINVAL;
45
46	np = of_find_compatible_node(NULL, NULL, "chrp,iic");
47	if (!np)
48		np = of_find_compatible_node(NULL, NULL, "pnpPNP,000");
49	if (np) {
50		of_node_put(np);
51		/*
52		 * Use a fixed interrupt value of 8 since on PPC if we are
53		 * using this its off an i8259 which we ensure has interrupt
54		 * numbers 0..15.
55		 */
56		res[1].start = 8;
57		res[1].end = 8;
58		res[1].flags = IORESOURCE_IRQ;
59		num_res++;
60	}
61
62	pd = platform_device_register_simple("rtc_cmos", -1,
63					     &res[0], num_res);
64
65	return PTR_ERR_OR_ZERO(pd);
66}
67fs_initcall(add_rtc);
68
69MODULE_LICENSE("GPL");
70