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riscv-openocd/contrib/loaders/watchdog/armv7m_kinetis_wdog32.s

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contrib: replace the GPLv2-or-later license tag Replace the GPLv2-or-later boilerplate with the SPDX tag. The SPDX tag on files *.c is incorrect, as it should use the C99 single line comment using '//'. But current checkpatch doesn't allow C99 comments, so keep using standard C comments, by now. Change-Id: I380d552940f1c405309a3346454251c0e80b5a45 Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: https://review.openocd.org/c/openocd/+/7159 Tested-by: jenkins
2022-08-30 15:18:31 -05:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
flash Kinetis: handle all types of watchdog, disable in reset-init Active watchdog forces reset during armv7m_checksum_memory() in verify_image command if run just after reset init. COP watchdog in KL series and WDOG32 in KE1 series have longer timeout however they need to be disabled too. The change extends 'kinetis disable_wdog' command to optionally probe the chip and use appropriate algorithm to disable watchdog. Setting of cache type is also split from flash_support flags. Tcl command 'kinetis disable_wdog' is called in reset-init event. Change-Id: I3191e230f38b679ed74f2a97fe323ef8fb3fe22e Signed-off-by: Tomas Vanek <vanekt@fbl.cz> Reviewed-on: http://openocd.zylin.com/3901 Tested-by: jenkins Reviewed-by: Joakim Nohlgård <joakim.nohlgard@eistec.se> Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
2016-12-26 12:59:10 -06:00
/***************************************************************************
* Copyright (C) 2017 Tomas Vanek *
* vanekt@fbl.cz *
***************************************************************************/
/*
Disable watchdog, 32-bit version for newer Kinetis
Parameters:
r0 ... WDOG32 base (in)
Used instruction set should work on both Cortex-M4 and M0+
*/
.text
.syntax unified
.cpu cortex-m0
.thumb
/* WDOG registers offsets */
WDOG_CS = 0
WDOG_CNT = 4
WDOG_TOVAL = 8
WDOG_KEY = 0xd928c520
.thumb_func
start:
/* test WDOG_CS bit CMD32EN */
ldr r2, [r0, WDOG_CS]
ldr r3, =0x2000
tst r2, r3
ldr r3, =WDOG_KEY
beq cmd16
/* WDOG_CNT = key */
str r3, [r0, WDOG_CNT]
b unlocked
cmd16:
/* WDOG_CNT = key, halfword by halfword */
strh r3, [r0, WDOG_CNT]
lsrs r3, r3, #16
strh r3, [r0, WDOG_CNT]
/* WDOG_CS: clear EN bit 7, set UPDATE bit 5 */
unlocked:
movs r4, #0x80
bics r2, r4
movs r4, #0x20
orrs r2, r4
str r2, [r0, WDOG_CS]
/* All active WDOG registers have to be updated, set dummy timeout */
/* WDOG_TOVAL = 0x400 */
ldr r3, =0x400
str r3, [r0, WDOG_TOVAL]
/* OpenOCD checks exit point address. Jump to the very end. */
b done
.pool
/* Avoid padding at .text segment end. Otherwise exit point check fails. */
.skip ( . - start + 2) & 2, 0
done:
bkpt #0
.end