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| 1 | /* |
| 2 | * Copyright 2011 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * Tilera-specific RTC driver. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/rtc.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | |
| 22 | /* Platform device pointer. */ |
| 23 | static struct platform_device *tile_rtc_platform_device; |
| 24 | |
| 25 | /* |
| 26 | * RTC read routine. Gets time info from RTC chip via hypervisor syscall. |
| 27 | */ |
| 28 | static int read_rtc_time(struct device *dev, struct rtc_time *tm) |
| 29 | { |
| 30 | HV_RTCTime hvtm = hv_get_rtc(); |
| 31 | |
| 32 | tm->tm_sec = hvtm.tm_sec; |
| 33 | tm->tm_min = hvtm.tm_min; |
| 34 | tm->tm_hour = hvtm.tm_hour; |
| 35 | tm->tm_mday = hvtm.tm_mday; |
| 36 | tm->tm_mon = hvtm.tm_mon; |
| 37 | tm->tm_year = hvtm.tm_year; |
| 38 | tm->tm_wday = 0; |
| 39 | tm->tm_yday = 0; |
| 40 | tm->tm_isdst = 0; |
| 41 | |
| 42 | if (rtc_valid_tm(tm) < 0) |
| 43 | dev_warn(dev, "Read invalid date/time from RTC\n"); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * RTC write routine. Sends time info to hypervisor via syscall, to be |
| 50 | * written to RTC chip. |
| 51 | */ |
| 52 | static int set_rtc_time(struct device *dev, struct rtc_time *tm) |
| 53 | { |
| 54 | HV_RTCTime hvtm; |
| 55 | |
| 56 | hvtm.tm_sec = tm->tm_sec; |
| 57 | hvtm.tm_min = tm->tm_min; |
| 58 | hvtm.tm_hour = tm->tm_hour; |
| 59 | hvtm.tm_mday = tm->tm_mday; |
| 60 | hvtm.tm_mon = tm->tm_mon; |
| 61 | hvtm.tm_year = tm->tm_year; |
| 62 | |
| 63 | hv_set_rtc(hvtm); |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * RTC read/write ops. |
| 70 | */ |
| 71 | static const struct rtc_class_ops tile_rtc_ops = { |
| 72 | .read_time = read_rtc_time, |
| 73 | .set_time = set_rtc_time, |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * Device probe routine. |
| 78 | */ |
| 79 | static int __devinit tile_rtc_probe(struct platform_device *dev) |
| 80 | { |
| 81 | struct rtc_device *rtc; |
| 82 | |
| 83 | rtc = rtc_device_register("tile", |
| 84 | &dev->dev, &tile_rtc_ops, THIS_MODULE); |
| 85 | |
| 86 | if (IS_ERR(rtc)) |
| 87 | return PTR_ERR(rtc); |
| 88 | |
| 89 | platform_set_drvdata(dev, rtc); |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Device cleanup routine. |
| 96 | */ |
| 97 | static int __devexit tile_rtc_remove(struct platform_device *dev) |
| 98 | { |
| 99 | struct rtc_device *rtc = platform_get_drvdata(dev); |
| 100 | |
| 101 | if (rtc) |
| 102 | rtc_device_unregister(rtc); |
| 103 | |
| 104 | platform_set_drvdata(dev, NULL); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static struct platform_driver tile_rtc_platform_driver = { |
| 110 | .driver = { |
| 111 | .name = "rtc-tile", |
| 112 | .owner = THIS_MODULE, |
| 113 | }, |
| 114 | .probe = tile_rtc_probe, |
| 115 | .remove = __devexit_p(tile_rtc_remove), |
| 116 | }; |
| 117 | |
| 118 | /* |
| 119 | * Driver init routine. |
| 120 | */ |
| 121 | static int __init tile_rtc_driver_init(void) |
| 122 | { |
| 123 | int err; |
| 124 | |
| 125 | err = platform_driver_register(&tile_rtc_platform_driver); |
| 126 | if (err) |
| 127 | return err; |
| 128 | |
| 129 | tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0); |
| 130 | if (tile_rtc_platform_device == NULL) { |
| 131 | err = -ENOMEM; |
| 132 | goto exit_driver_unregister; |
| 133 | } |
| 134 | |
| 135 | err = platform_device_add(tile_rtc_platform_device); |
| 136 | if (err) |
| 137 | goto exit_device_put; |
| 138 | |
| 139 | return 0; |
| 140 | |
| 141 | exit_device_put: |
| 142 | platform_device_put(tile_rtc_platform_device); |
| 143 | |
| 144 | exit_driver_unregister: |
| 145 | platform_driver_unregister(&tile_rtc_platform_driver); |
| 146 | return err; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Driver cleanup routine. |
| 151 | */ |
| 152 | static void __exit tile_rtc_driver_exit(void) |
| 153 | { |
| 154 | platform_driver_unregister(&tile_rtc_platform_driver); |
| 155 | } |
| 156 | |
| 157 | module_init(tile_rtc_driver_init); |
| 158 | module_exit(tile_rtc_driver_exit); |
| 159 | |
| 160 | MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver"); |
| 161 | MODULE_LICENSE("GPL"); |
| 162 | MODULE_ALIAS("platform:rtc-tile"); |
| 163 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9
