cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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olpc-xo1-rtc.c (1681B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Support for OLPC XO-1 Real Time Clock (RTC)
      4 *
      5 * Copyright (C) 2011 One Laptop per Child
      6 */
      7
      8#include <linux/mc146818rtc.h>
      9#include <linux/platform_device.h>
     10#include <linux/rtc.h>
     11#include <linux/of.h>
     12
     13#include <asm/msr.h>
     14#include <asm/olpc.h>
     15#include <asm/x86_init.h>
     16
     17static void rtc_wake_on(struct device *dev)
     18{
     19	olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
     20}
     21
     22static void rtc_wake_off(struct device *dev)
     23{
     24	olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
     25}
     26
     27static struct resource rtc_platform_resource[] = {
     28	[0] = {
     29		.start	= RTC_PORT(0),
     30		.end	= RTC_PORT(1),
     31		.flags	= IORESOURCE_IO,
     32	},
     33	[1] = {
     34		.start	= RTC_IRQ,
     35		.end	= RTC_IRQ,
     36		.flags	= IORESOURCE_IRQ,
     37	}
     38};
     39
     40static struct cmos_rtc_board_info rtc_info = {
     41	.rtc_day_alarm = 0,
     42	.rtc_mon_alarm = 0,
     43	.rtc_century = 0,
     44	.wake_on = rtc_wake_on,
     45	.wake_off = rtc_wake_off,
     46};
     47
     48static struct platform_device xo1_rtc_device = {
     49	.name = "rtc_cmos",
     50	.id = -1,
     51	.num_resources = ARRAY_SIZE(rtc_platform_resource),
     52	.dev.platform_data = &rtc_info,
     53	.resource = rtc_platform_resource,
     54};
     55
     56static int __init xo1_rtc_init(void)
     57{
     58	int r;
     59	struct device_node *node;
     60
     61	node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
     62	if (!node)
     63		return 0;
     64	of_node_put(node);
     65
     66	pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
     67	rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
     68	rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
     69	rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
     70
     71	r = platform_device_register(&xo1_rtc_device);
     72	if (r)
     73		return r;
     74
     75	x86_platform.legacy.rtc = 0;
     76
     77	device_init_wakeup(&xo1_rtc_device.dev, 1);
     78	return 0;
     79}
     80arch_initcall(xo1_rtc_init);