blob: af0f9beddca9be85b3720bf84109033a1ee13aa3 [file] [log] [blame]
Wade Farnsworth93ab4712007-07-11 02:55:46 +10001/*
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>
Paul Gortmaker7dfe2932011-05-27 13:23:32 -040015#include <linux/module.h>
Wade Farnsworth93ab4712007-07-11 02:55:46 +100016#include <linux/mc146818rtc.h>
17
18#include <asm/prom.h>
19
20static int __init add_rtc(void)
21{
22 struct device_node *np;
23 struct platform_device *pd;
Kumar Galaada3ea62007-08-16 23:44:00 -050024 struct resource res[2];
Anton Vorontsove5178812008-06-12 03:04:31 +040025 unsigned int num_res = 1;
Wade Farnsworth93ab4712007-07-11 02:55:46 +100026 int ret;
27
Kumar Galaada3ea62007-08-16 23:44:00 -050028 memset(&res, 0, sizeof(res));
29
Wade Farnsworth93ab4712007-07-11 02:55:46 +100030 np = of_find_compatible_node(NULL, NULL, "pnpPNP,b00");
31 if (!np)
32 return -ENODEV;
33
Kumar Galaada3ea62007-08-16 23:44:00 -050034 ret = of_address_to_resource(np, 0, &res[0]);
Wade Farnsworth93ab4712007-07-11 02:55:46 +100035 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 */
Kumar Galaada3ea62007-08-16 23:44:00 -050043 if (res[0].start != RTC_PORT(0))
Wade Farnsworth93ab4712007-07-11 02:55:46 +100044 return -EINVAL;
45
Anton Vorontsove5178812008-06-12 03:04:31 +040046 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 }
Kumar Galaada3ea62007-08-16 23:44:00 -050061
Wade Farnsworth93ab4712007-07-11 02:55:46 +100062 pd = platform_device_register_simple("rtc_cmos", -1,
Anton Vorontsove5178812008-06-12 03:04:31 +040063 &res[0], num_res);
Kumar Galaada3ea62007-08-16 23:44:00 -050064
Rusty Russell8c6ffba2013-07-15 11:20:32 +093065 return PTR_ERR_OR_ZERO(pd);
Wade Farnsworth93ab4712007-07-11 02:55:46 +100066}
67fs_initcall(add_rtc);
Adrian Bunk3fbe9d42008-04-15 00:19:42 +100068
69MODULE_LICENSE("GPL");