atsam/start/power-clock.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  * Copyright (c) 2016 embedded brains GmbH & Co. KG
0005  *
0006  * Redistribution and use in source and binary forms, with or without
0007  * modification, are permitted provided that the following conditions
0008  * are met:
0009  * 1. Redistributions of source code must retain the above copyright
0010  *    notice, this list of conditions and the following disclaimer.
0011  * 2. Redistributions in binary form must reproduce the above copyright
0012  *    notice, this list of conditions and the following disclaimer in the
0013  *    documentation and/or other materials provided with the distribution.
0014  *
0015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0016  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0017  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0018  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0019  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0020  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0021  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0024  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0025  * POSSIBILITY OF SUCH DAMAGE.
0026  */
0027
0028 #include <bsp.h>
0029 #include <bsp/power.h>
0030 #include <bsp/irq.h>
0031
0032 #include <libchip/chip.h>
0033
0034 #include <rtems/score/armv7m.h>
0035
0036 void atsam_power_handler_clock_driver(
0037     const atsam_power_control *control,
0038     atsam_power_state state
0039 )
0040 {
0041     volatile ARMV7M_Systick *systick = _ARMV7M_Systick;
0042
0043     (void) control;
0044
0045     switch (state) {
0046         case ATSAM_POWER_ON:
0047             systick->csr = ARMV7M_SYSTICK_CSR_ENABLE |
0048                 ARMV7M_SYSTICK_CSR_TICKINT |
0049                 ARMV7M_SYSTICK_CSR_CLKSOURCE;
0050             break;
0051         case ATSAM_POWER_OFF:
0052             systick->csr = 0;
0053             break;
0054         default:
0055             break;
0056     }
0057 }