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80 lines
1.6 KiB
80 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Support for OLPC XO-1 Real Time Clock (RTC) |
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* |
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* Copyright (C) 2011 One Laptop per Child |
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*/ |
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#include <linux/mc146818rtc.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/of.h> |
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#include <asm/msr.h> |
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#include <asm/olpc.h> |
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#include <asm/x86_init.h> |
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static void rtc_wake_on(struct device *dev) |
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{ |
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olpc_xo1_pm_wakeup_set(CS5536_PM_RTC); |
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} |
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static void rtc_wake_off(struct device *dev) |
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{ |
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olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC); |
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} |
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static struct resource rtc_platform_resource[] = { |
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[0] = { |
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.start = RTC_PORT(0), |
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.end = RTC_PORT(1), |
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.flags = IORESOURCE_IO, |
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}, |
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[1] = { |
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.start = RTC_IRQ, |
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.end = RTC_IRQ, |
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.flags = IORESOURCE_IRQ, |
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} |
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}; |
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static struct cmos_rtc_board_info rtc_info = { |
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.rtc_day_alarm = 0, |
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.rtc_mon_alarm = 0, |
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.rtc_century = 0, |
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.wake_on = rtc_wake_on, |
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.wake_off = rtc_wake_off, |
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}; |
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static struct platform_device xo1_rtc_device = { |
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.name = "rtc_cmos", |
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.id = -1, |
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.num_resources = ARRAY_SIZE(rtc_platform_resource), |
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.dev.platform_data = &rtc_info, |
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.resource = rtc_platform_resource, |
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}; |
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static int __init xo1_rtc_init(void) |
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{ |
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int r; |
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struct device_node *node; |
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node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc"); |
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if (!node) |
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return 0; |
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of_node_put(node); |
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pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n"); |
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rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm); |
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rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm); |
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rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century); |
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r = platform_device_register(&xo1_rtc_device); |
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if (r) |
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return r; |
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x86_platform.legacy.rtc = 0; |
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device_init_wakeup(&xo1_rtc_device.dev, 1); |
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return 0; |
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} |
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arch_initcall(xo1_rtc_init);
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