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 | void atsam_power_change_state( |
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35 | const atsam_power_control *controls, |
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36 | size_t n, |
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37 | atsam_power_state state |
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38 | ) |
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39 | { |
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40 | size_t i; |
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41 | |
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42 | switch (state) { |
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43 | case ATSAM_POWER_ON: |
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44 | for (i = n; i > 0; --i) { |
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45 | const atsam_power_control *c; |
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46 | |
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47 | c = &controls[i - 1]; |
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48 | (*c->handler)(c, state); |
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49 | } |
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50 | |
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51 | break; |
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52 | case ATSAM_POWER_INIT: |
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53 | case ATSAM_POWER_OFF: |
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54 | for (i = 0; i < n; ++i) { |
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55 | const atsam_power_control *c; |
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56 | |
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57 | c = &controls[i]; |
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58 | (*c->handler)(c, state); |
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59 | } |
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60 | |
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61 | break; |
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62 | default: |
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63 | break; |
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64 | } |
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65 | } |
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66 | |
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67 | void atsam_power_handler_peripheral( |
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68 | const atsam_power_control *control, |
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69 | atsam_power_state state |
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70 | ) |
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71 | { |
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72 | uint32_t id; |
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73 | uint32_t end; |
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74 | |
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75 | id = control->data.peripherals.first; |
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76 | end = control->data.peripherals.last + 1; |
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77 | |
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78 | switch (state) { |
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79 | case ATSAM_POWER_ON: |
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80 | while (id != end) { |
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81 | PMC_EnablePeripheral(id); |
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82 | ++id; |
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83 | } |
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84 | break; |
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85 | case ATSAM_POWER_OFF: |
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86 | while (id != end) { |
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87 | PMC_DisablePeripheral(id); |
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88 | ++id; |
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89 | } |
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90 | break; |
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91 | default: |
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92 | break; |
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93 | } |
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94 | } |
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95 | |
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96 | void atsam_power_handler_sleep_mode(const atsam_power_control *control, atsam_power_state state) |
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97 | { |
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98 | (void) control; |
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99 | |
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100 | switch (state) { |
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101 | case ATSAM_POWER_OFF: |
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102 | /* Enable Low Power Mode in the Fast Startup Mode Register */ |
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103 | PMC->PMC_FSMR &= (uint32_t)~PMC_FSMR_LPM; |
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104 | /* Do not set deep sleep, but "normal" sleep */ |
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105 | SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk; |
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106 | |
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107 | __asm__ volatile ("wfi"); |
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108 | break; |
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109 | default: |
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110 | break; |
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111 | } |
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112 | } |
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