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authorWade Farnsworth <wfarnsworth@mvista.com>2007-07-10 20:55:46 +0400
committerPaul Mackerras <paulus@samba.org>2007-07-11 07:24:40 +0400
commit93ab471889c6662b42ce7da257f31f24c08d7d9e (patch)
treed1e665ac13b65c94ef5606787209e096a7d5793c /arch/powerpc/sysdev/rtc_cmos_setup.c
parent3c0c9e389bb9618fee2300eea2d135e4db64c4ba (diff)
downloadlinux-93ab471889c6662b42ce7da257f31f24c08d7d9e.tar.xz
[POWERPC] Create add_rtc() function to enable the RTC CMOS driver
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>
Diffstat (limited to 'arch/powerpc/sysdev/rtc_cmos_setup.c')
-rw-r--r--arch/powerpc/sysdev/rtc_cmos_setup.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/rtc_cmos_setup.c b/arch/powerpc/sysdev/rtc_cmos_setup.c
new file mode 100644
index 000000000000..e276048b8c5f
--- /dev/null
+++ b/arch/powerpc/sysdev/rtc_cmos_setup.c
@@ -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);