Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / powerpc / sysdev / rtc_cmos_setup.c

diff --git a/kernel/arch/powerpc/sysdev/rtc_cmos_setup.c b/kernel/arch/powerpc/sysdev/rtc_cmos_setup.c
new file mode 100644 (file)
index 0000000..af0f9be
--- /dev/null
+++ b/kernel/arch/powerpc/sysdev/rtc_cmos_setup.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <asm/prom.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");