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1 | /* |
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2 | * Copyright (c) 2016 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.rtems.org/license/LICENSE. |
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7 | */ |
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8 | |
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9 | #include <bsp.h> |
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10 | #include <bsp/power.h> |
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11 | #include <bsp/irq.h> |
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12 | |
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13 | #include <libchip/chip.h> |
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14 | |
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15 | void atsam_power_change_state( |
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16 | const atsam_power_control *controls, |
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17 | size_t n, |
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18 | atsam_power_state state |
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19 | ) |
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20 | { |
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21 | size_t i; |
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22 | |
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23 | switch (state) { |
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24 | case ATSAM_POWER_ON: |
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25 | for (i = n; i > 0; --i) { |
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26 | const atsam_power_control *c; |
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27 | |
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28 | c = &controls[i - 1]; |
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29 | (*c->handler)(c, state); |
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30 | } |
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31 | |
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32 | break; |
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33 | case ATSAM_POWER_INIT: |
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34 | case ATSAM_POWER_OFF: |
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35 | for (i = 0; i < n; ++i) { |
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36 | const atsam_power_control *c; |
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37 | |
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38 | c = &controls[i]; |
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39 | (*c->handler)(c, state); |
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40 | } |
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41 | |
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42 | break; |
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43 | default: |
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44 | break; |
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45 | } |
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46 | } |
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47 | |
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48 | void atsam_power_handler_peripheral( |
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49 | const atsam_power_control *control, |
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50 | atsam_power_state state |
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51 | ) |
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52 | { |
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53 | uint32_t id; |
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54 | uint32_t end; |
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55 | |
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56 | id = control->data.peripherals.first; |
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57 | end = control->data.peripherals.last + 1; |
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58 | |
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59 | switch (state) { |
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60 | case ATSAM_POWER_ON: |
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61 | while (id != end) { |
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62 | PMC_EnablePeripheral(id); |
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63 | ++id; |
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64 | } |
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65 | break; |
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66 | case ATSAM_POWER_OFF: |
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67 | while (id != end) { |
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68 | PMC_DisablePeripheral(id); |
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69 | ++id; |
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70 | } |
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71 | break; |
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72 | default: |
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73 | break; |
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74 | } |
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75 | } |
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76 | |
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77 | void atsam_power_handler_sleep_mode(const atsam_power_control *control, atsam_power_state state) |
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78 | { |
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79 | (void) control; |
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80 | |
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81 | switch (state) { |
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82 | case ATSAM_POWER_OFF: |
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83 | /* Enable Low Power Mode in the Fast Startup Mode Register */ |
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84 | PMC->PMC_FSMR &= (uint32_t)~PMC_FSMR_LPM; |
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85 | /* Do not set deep sleep, but "normal" sleep */ |
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86 | SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk; |
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87 | |
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88 | __asm__ volatile ("wfi"); |
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89 | break; |
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90 | default: |
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91 | break; |
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92 | } |
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93 | } |
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