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tcl/interface: universal config for all Raspberry Pi models

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Speed calibration coeffs are computed from cpufreq/scaling_max_freq
and from the device-tree compatibility information.

Raspberry Pi linux offers /dev/gpiomem for non-root access
to the GPIO registers since ~2016.
Do not configure 'bcm2835gpio peripheral_base' as it is necessary
only if /dev/mem is used - it requires running OpenOCD as root
- it's a security risk so it should be avoided.

The configuration of the GPIO connector (40-pin header)
is factored out and ready to use in interface configuration
for other driver (e.g. linux gpiod).

Mark raspberrypi2-native.cfg as deprecated and redirect
it to raspberrypi-native.cfg

Change-Id: Icce856fb660b45374e94174da279feb51f529908
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/7264
Tested-by: jenkins
Reviewed-by: Jonathan Bell <jonathan@raspberrypi.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Tomas Vanek
2022-10-14 11:16:58 +02:00
committed by Antonio Borneo
parent 2dde7e914b
commit bec6c0eb09
3 changed files with 108 additions and 77 deletions
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44
tcl/interface/raspberrypi2-native.cfg
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@@ -1,44 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Config for using Raspberry Pi's expansion header
#
# This is best used with a fast enough buffer but also
# is suitable for direct connection if the target voltage
# matches RPi's 3.3V and the cable is short enough.
#
# Do not forget the GND connection, pin 6 of the expansion header.
#
echo "WARNING: interface/raspberrypi2-native.cfg is deprecated."
echo "WARNING: Please use interface/raspberrypi-native.cfg for all Raspberry Pi models."
adapter driver bcm2835gpio
bcm2835gpio peripheral_base 0x3F000000
# Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
# These depend on system clock, calibrated for scaling_max_freq 900MHz
# bcm2835gpio speed SPEED_COEFF SPEED_OFFSET
bcm2835gpio speed_coeffs 225000 36
# Each of the JTAG lines need a gpio number set: tck tms tdi tdo
# Header pin numbers: 23 22 19 21
adapter gpio tck -chip 0 11
adapter gpio tms -chip 0 25
adapter gpio tdi -chip 0 10
adapter gpio tdo -chip 0 9
# Each of the SWD lines need a gpio number set: swclk swdio
# Header pin numbers: 23 22
adapter gpio swclk -chip 0 11
adapter gpio swdio -chip 0 25
# If you define trst or srst, use appropriate reset_config
# Header pin numbers: TRST - 26, SRST - 18
# adapter gpio trst -chip 0 7
# reset_config trst_only
# adapter gpio srst -chip 0 24
# reset_config srst_only srst_push_pull
# or if you have both connected,
# reset_config trst_and_srst srst_push_pull
source [find interface/raspberrypi-native.cfg]