x86, olpc: Add XO-1 RTC driver

[pandora-kernel.git] / arch / x86 / platform / olpc / olpc-xo1-rtc.c

diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c
new file mode 100644 (file)
index 0000000..a2b4efd
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo1-rtc.c
@@ -0,0 +1,81 @@
+/*
+ * Support for OLPC XO-1 Real Time Clock (RTC)
+ *
+ * Copyright (C) 2011 One Laptop per Child
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/mc146818rtc.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/of.h>
+
+#include <asm/msr.h>
+#include <asm/olpc.h>
+
+static void rtc_wake_on(struct device *dev)
+{
+       olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+       olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
+}
+
+static struct resource rtc_platform_resource[] = {
+       [0] = {
+               .start  = RTC_PORT(0),
+               .end    = RTC_PORT(1),
+               .flags  = IORESOURCE_IO,
+       },
+       [1] = {
+               .start  = RTC_IRQ,
+               .end    = RTC_IRQ,
+               .flags  = IORESOURCE_IRQ,
+       }
+};
+
+static struct cmos_rtc_board_info rtc_info = {
+       .rtc_day_alarm = 0,
+       .rtc_mon_alarm = 0,
+       .rtc_century = 0,
+       .wake_on = rtc_wake_on,
+       .wake_off = rtc_wake_off,
+};
+
+static struct platform_device xo1_rtc_device = {
+       .name = "rtc_cmos",
+       .id = -1,
+       .num_resources = ARRAY_SIZE(rtc_platform_resource),
+       .dev.platform_data = &rtc_info,
+       .resource = rtc_platform_resource,
+};
+
+static int __init xo1_rtc_init(void)
+{
+       int r;
+       struct device_node *node;
+
+       node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
+       if (!node)
+               return 0;
+       of_node_put(node);
+
+       pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
+       rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
+       rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
+       rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
+
+       r = platform_device_register(&xo1_rtc_device);
+       if (r)
+               return r;
+
+       device_init_wakeup(&xo1_rtc_device.dev, 1);
+       return 0;
+}
+arch_initcall(xo1_rtc_init);