qoriq/start/bspreset.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsPowerPCQorIQ
0007  *
0008  * @brief BSP reset.
0009  */
0010
0011 /*
0012  * Copyright (C) 2010, 2017 embedded brains GmbH & Co. KG
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #include <bsp/bootcard.h>
0037 #include <bsp/fdt.h>
0038 #include <bsp/qoriq.h>
0039
0040 #include <libfdt.h>
0041
0042 static int find_rstcr_node(const void *fdt, int node)
0043 {
0044   return fdt_node_offset_by_prop_value(fdt, node, "fsl,has-rstcr", NULL, 0);
0045 }
0046
0047 void bsp_reset( rtems_fatal_source source, rtems_fatal_code code )
0048 {
0049   rtems_interrupt_level level;
0050   const char *fdt;
0051
0052   (void) source;
0053   (void) code;
0054
0055   rtems_interrupt_local_disable(level);
0056   (void) level;
0057
0058   fdt = bsp_fdt_get();
0059
0060   /* If we do not find a RSTCR, then loop forever */
0061   while (true) {
0062     int node;
0063
0064     node = -1;
0065
0066     while ((node = find_rstcr_node(fdt, node)) >= 0) {
0067       const uint32_t *reg;
0068       int len;
0069
0070       reg = fdt_getprop(fdt, node, "reg", &len);
0071       if (reg != NULL && len >= 4) {
0072         volatile uint32_t *rstcr;
0073
0074         rstcr = (volatile uint32_t *)
0075           ((uintptr_t) &qoriq + fdt32_to_cpu(reg[0]) + 0xb0);
0076         *rstcr = 0x2;
0077       }
0078     }
0079   }
0080 }