From cfee95977bea090ae5ec4fd442ebd381792d46c4 Mon Sep 17 00:00:00 2001 From: Daniel Drake Date: Sat, 25 Jun 2011 17:34:17 +0100 Subject: x86, olpc: Add XO-1 RTC driver Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a system wakeup source via olpc-xo1-pm. Device detection is based on finding the relevant device tree node. Signed-off-by: Daniel Drake Link: http://lkml.kernel.org/r/1309019658-1712-11-git-send-email-dsd@laptop.org Acked-by: Andres Salomon Acked-by: Grant Likely Reviewed-by: Sebastian Andrzej Siewior Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: H. Peter Anvin --- arch/x86/platform/olpc/Makefile | 1 + arch/x86/platform/olpc/olpc-xo1-rtc.c | 81 +++++++++++++++++++++++++++++++++++ 2 files changed, 82 insertions(+) create mode 100644 arch/x86/platform/olpc/olpc-xo1-rtc.c (limited to 'arch/x86/platform/olpc') diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile index 1ec5ade97f44..8922b9b3cd7a 100644 --- a/arch/x86/platform/olpc/Makefile +++ b/arch/x86/platform/olpc/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_OLPC) += olpc.o olpc_ofw.o olpc_dt.o obj-$(CONFIG_OLPC_XO1_PM) += olpc-xo1-pm.o xo1-wakeup.o +obj-$(CONFIG_OLPC_XO1_RTC) += olpc-xo1-rtc.o obj-$(CONFIG_OLPC_XO1_SCI) += olpc-xo1-sci.o diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c new file mode 100644 index 000000000000..a2b4efddd61a --- /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 +#include +#include +#include + +#include +#include + +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); -- cgit 1.4.1