1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /* |
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4 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * |
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15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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16 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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19 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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20 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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21 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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24 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 | * POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |
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28 | #include <bsp.h> |
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29 | #include <bsp/power.h> |
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30 | #include <bsp/irq.h> |
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31 | |
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32 | #include <libchip/chip.h> |
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33 | |
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34 | #define ATSAM_ENABLE_ALARM_INTERRUPT RTC_IER_ALREN |
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35 | |
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36 | static void set_rtc_alarm_interrupt(uint32_t interval) |
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37 | { |
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38 | Rtc *rtc = RTC; |
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39 | uint8_t hour; |
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40 | uint8_t minute; |
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41 | uint8_t second; |
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42 | uint32_t time; |
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43 | |
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44 | /* Clear current status register */ |
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45 | RTC_ClearSCCR(rtc, 0x3F); |
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46 | |
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47 | RTC_GetTime(rtc, &hour, &minute, &second); |
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48 | |
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49 | time = UINT32_C(3600) * hour + UINT32_C(60) * minute + second; |
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50 | time = (time + interval) % (UINT32_C(24) * 3600); |
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51 | |
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52 | second = (uint8_t) (time % 60); |
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53 | minute = (uint8_t) ((time / 60) % 60); |
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54 | hour = (uint8_t) (time / 3600); |
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55 | |
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56 | if (interval < 60) { |
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57 | RTC_SetTimeAlarm(rtc, NULL, NULL, &second); |
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58 | } else if (interval < 3600) { |
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59 | RTC_SetTimeAlarm(rtc, NULL, &minute, &second); |
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60 | } else { |
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61 | RTC_SetTimeAlarm(rtc, &hour, &minute, &second); |
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62 | } |
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63 | |
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64 | RTC_EnableIt(rtc, ATSAM_ENABLE_ALARM_INTERRUPT); |
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65 | } |
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66 | |
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67 | static void rtc_interrupt_handler(void *arg) |
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68 | { |
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69 | atsam_power_data_rtc_driver *rtc_data; |
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70 | |
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71 | rtc_data = (atsam_power_data_rtc_driver *)arg; |
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72 | set_rtc_alarm_interrupt(rtc_data->interval); |
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73 | } |
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74 | |
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75 | static void rtc_alarm_handler(void *arg) |
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76 | { |
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77 | Rtc *rtc = RTC; |
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78 | rtems_status_code sc; |
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79 | |
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80 | /* Clear current status register */ |
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81 | RTC_ClearSCCR(rtc, 0x3F); |
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82 | |
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83 | /* Switch off all RTC interrupts */ |
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84 | RTC_DisableIt(rtc, 0x1F); |
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85 | |
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86 | /* Install RTC interrupt handler */ |
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87 | sc = rtems_interrupt_handler_install(RTC_IRQn, |
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88 | "RTC", |
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89 | RTEMS_INTERRUPT_UNIQUE, |
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90 | rtc_interrupt_handler, |
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91 | arg |
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92 | ); |
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93 | assert(sc == RTEMS_SUCCESSFUL); |
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94 | } |
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95 | |
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96 | static void set_time(void) |
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97 | { |
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98 | rtems_time_of_day tod; |
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99 | rtems_status_code sc; |
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100 | |
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101 | atsam_rtc_get_time(&tod); |
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102 | sc = rtems_clock_set(&tod); |
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103 | assert(sc == RTEMS_SUCCESSFUL); |
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104 | } |
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105 | |
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106 | void atsam_power_handler_rtc_driver( |
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107 | const atsam_power_control *control, |
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108 | atsam_power_state state |
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109 | ) |
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110 | { |
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111 | atsam_power_data_rtc_driver *rtc_data; |
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112 | rtems_interrupt_level level; |
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113 | Rtc *rtc = RTC; |
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114 | |
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115 | rtc_data = (atsam_power_data_rtc_driver *)control->data.arg; |
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116 | |
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117 | switch (state) { |
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118 | case ATSAM_POWER_ON: |
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119 | RTC_DisableIt(rtc, ATSAM_ENABLE_ALARM_INTERRUPT); |
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120 | set_time(); |
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121 | break; |
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122 | case ATSAM_POWER_OFF: |
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123 | set_rtc_alarm_interrupt(rtc_data->interval); |
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124 | break; |
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125 | case ATSAM_POWER_INIT: |
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126 | /* Enable fast startup via RTC alarm */ |
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127 | rtems_interrupt_disable(level); |
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128 | PMC->PMC_FSMR |= PMC_FSMR_RTCAL; |
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129 | rtems_interrupt_enable(level); |
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130 | |
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131 | rtc_alarm_handler(rtc_data); |
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132 | break; |
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133 | default: |
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134 | break; |
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135 | } |
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136 | } |
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