// SPDX-License-Identifier: GPL-2.0-or-later /* * Support for OLPC XO-1 Real Time Clock (RTC) * * Copyright (C) 2011 One Laptop per Child */ #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> #include <asm/x86_init.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; x86_platform.legacy.rtc = 0; device_init_wakeup(&xo1_rtc_device.dev, 1); return 0; } arch_initcall(xo1_rtc_init);