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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright 2017 NXP
*
* Peng Fan <peng.fan@nxp.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <drivers/imx_wdog.h>
#include <io.h>
#include <keep.h>
#include <kernel/dt.h>
#include <kernel/generic_boot.h>
#include <kernel/panic.h>
#ifdef CFG_DT
#include <libfdt.h>
#endif
#include <mm/core_mmu.h>
#include <mm/core_memprot.h>
#include <util.h>
static bool ext_reset;
static vaddr_t wdog_base;
void imx_wdog_restart(void)
{
uint32_t val;
if (!wdog_base) {
EMSG("No wdog mapped\n");
panic();
}
if (ext_reset)
val = 0x14;
else
val = 0x24;
DMSG("val %x\n", val);
io_write16(wdog_base + WDT_WCR, val);
dsb();
if (io_read16(wdog_base + WDT_WCR) & WDT_WCR_WDE) {
io_write16(wdog_base + WDT_WSR, WDT_SEQ1);
io_write16(wdog_base + WDT_WSR, WDT_SEQ2);
}
io_write16(wdog_base + WDT_WCR, val);
io_write16(wdog_base + WDT_WCR, val);
while (1)
;
}
KEEP_PAGER(imx_wdog_restart);
#if defined(CFG_DT) && !defined(CFG_EXTERNAL_DTB_OVERLAY)
static TEE_Result imx_wdog_base(vaddr_t *wdog_vbase)
{
enum teecore_memtypes mtype;
void *fdt;
paddr_t pbase;
vaddr_t vbase;
ssize_t sz;
int off;
int st;
uint32_t i;
#ifdef CFG_MX7
static const char * const wdog_path[] = {
"/soc/aips-bus@30000000/wdog@30280000",
"/soc/aips-bus@30000000/wdog@30290000",
"/soc/aips-bus@30000000/wdog@302a0000",
"/soc/aips-bus@30000000/wdog@302b0000",
};
#else
static const char * const wdog_path[] = {
"/soc/aips-bus@2000000/wdog@20bc000",
"/soc/aips-bus@2000000/wdog@20c0000",
};
#endif
fdt = get_dt();
if (!fdt) {
EMSG("No DTB\n");
return TEE_ERROR_NOT_SUPPORTED;
}
/* search the first usable wdog */
for (i = 0; i < ARRAY_SIZE(wdog_path); i++) {
off = fdt_path_offset(fdt, wdog_path[i]);
if (off < 0)
continue;
st = _fdt_get_status(fdt, off);
if (st & DT_STATUS_OK_SEC)
break;
}
if (i == ARRAY_SIZE(wdog_path))
return TEE_ERROR_ITEM_NOT_FOUND;
DMSG("path: %s\n", wdog_path[i]);
ext_reset = dt_have_prop(fdt, off, "fsl,ext-reset-output");
pbase = _fdt_reg_base_address(fdt, off);
if (pbase == (paddr_t)-1)
return TEE_ERROR_ITEM_NOT_FOUND;
sz = _fdt_reg_size(fdt, off);
if (sz < 0)
return TEE_ERROR_ITEM_NOT_FOUND;
if ((st & DT_STATUS_OK_SEC) && !(st & DT_STATUS_OK_NSEC))
mtype = MEM_AREA_IO_SEC;
else
mtype = MEM_AREA_IO_NSEC;
/*
* Check to see whether it has been mapped using
* register_phys_mem or not.
*/
vbase = (vaddr_t)phys_to_virt(pbase, mtype);
if (!vbase) {
if (!core_mmu_add_mapping(mtype, pbase, sz)) {
EMSG("Failed to map %zu bytes at PA 0x%"PRIxPA,
(size_t)sz, pbase);
return TEE_ERROR_GENERIC;
}
}
vbase = (vaddr_t)phys_to_virt(pbase, mtype);
if (!vbase) {
EMSG("Failed to get VA for PA 0x%"PRIxPA, pbase);
return TEE_ERROR_GENERIC;
}
*wdog_vbase = vbase;
return TEE_SUCCESS;
}
#else
register_phys_mem_pgdir(MEM_AREA_IO_SEC, WDOG_BASE, CORE_MMU_PGDIR_SIZE);
static TEE_Result imx_wdog_base(vaddr_t *wdog_vbase)
{
*wdog_vbase = (vaddr_t)phys_to_virt(WDOG_BASE, MEM_AREA_IO_SEC);
#if defined(CFG_IMX_WDOG_EXT_RESET)
ext_reset = true;
#endif
return TEE_SUCCESS;
}
#endif
static TEE_Result imx_wdog_init(void)
{
#if defined(PLATFORM_FLAVOR_mx7dsabresd) || \
defined(PLATFORM_FLAVOR_mx7dclsom)
ext_reset = true;
#endif
return imx_wdog_base(&wdog_base);
}
driver_init(imx_wdog_init);
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