| Daniel Drake | cfee959 | 2011-06-25 17:34:17 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Support for OLPC XO-1 Real Time Clock (RTC) |
| 3 | * |
| 4 | * Copyright (C) 2011 One Laptop per Child |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/mc146818rtc.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/rtc.h> |
| 15 | #include <linux/of.h> |
| 16 | |
| 17 | #include <asm/msr.h> |
| 18 | #include <asm/olpc.h> |
| 19 | |
| 20 | static void rtc_wake_on(struct device *dev) |
| 21 | { |
| 22 | olpc_xo1_pm_wakeup_set(CS5536_PM_RTC); |
| 23 | } |
| 24 | |
| 25 | static void rtc_wake_off(struct device *dev) |
| 26 | { |
| 27 | olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC); |
| 28 | } |
| 29 | |
| 30 | static struct resource rtc_platform_resource[] = { |
| 31 | [0] = { |
| 32 | .start = RTC_PORT(0), |
| 33 | .end = RTC_PORT(1), |
| 34 | .flags = IORESOURCE_IO, |
| 35 | }, |
| 36 | [1] = { |
| 37 | .start = RTC_IRQ, |
| 38 | .end = RTC_IRQ, |
| 39 | .flags = IORESOURCE_IRQ, |
| 40 | } |
| 41 | }; |
| 42 | |
| 43 | static struct cmos_rtc_board_info rtc_info = { |
| 44 | .rtc_day_alarm = 0, |
| 45 | .rtc_mon_alarm = 0, |
| 46 | .rtc_century = 0, |
| 47 | .wake_on = rtc_wake_on, |
| 48 | .wake_off = rtc_wake_off, |
| 49 | }; |
| 50 | |
| 51 | static struct platform_device xo1_rtc_device = { |
| 52 | .name = "rtc_cmos", |
| 53 | .id = -1, |
| 54 | .num_resources = ARRAY_SIZE(rtc_platform_resource), |
| 55 | .dev.platform_data = &rtc_info, |
| 56 | .resource = rtc_platform_resource, |
| 57 | }; |
| 58 | |
| 59 | static int __init xo1_rtc_init(void) |
| 60 | { |
| 61 | int r; |
| 62 | struct device_node *node; |
| 63 | |
| 64 | node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc"); |
| 65 | if (!node) |
| 66 | return 0; |
| 67 | of_node_put(node); |
| 68 | |
| 69 | pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n"); |
| 70 | rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm); |
| 71 | rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm); |
| 72 | rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century); |
| 73 | |
| 74 | r = platform_device_register(&xo1_rtc_device); |
| 75 | if (r) |
| 76 | return r; |
| 77 | |
| 78 | device_init_wakeup(&xo1_rtc_device.dev, 1); |
| 79 | return 0; |
| 80 | } |
| 81 | arch_initcall(xo1_rtc_init); |