1 # SPDX-License-Identifier: GPL-2.0-or-later
3 # Config for Raspberry Pi used as a bitbang adapter.
4 # https://www.raspberrypi.com/documentation/computers/raspberry-pi.html
6 # Supports all models with 40-pin or 26-pin GPIO connector up to Raspberry Pi 4 B
7 # also supports Raspberry Pi Zero, Zero W and Zero 2 W.
9 # Adapter speed calibration is computed from cpufreq/scaling_max_freq.
10 # Adjusts automatically if CPU is overclocked.
12 adapter driver bcm2835gpio
14 proc read_file { name } {
15 if {[catch {open $name r} fd]} {
23 proc measure_clock {} {
24 set result [exec vcgencmd measure_clock arm]
25 set clock_hz [lindex [split $result "="] 1]
26 expr { $clock_hz / 1000 }
29 proc get_max_cpu_clock { default } {
30 set clock [read_file /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq]
31 if { $clock > 100000 } {
35 # cpufreq not available. As the last resort try Broadcom's proprietary utility
36 if {![catch measure_clock clock] && $clock > 100000} {
40 echo "WARNING: Host CPU clock unknown."
41 echo "WARNING: Using the highest possible value $default kHz as a safe default."
42 echo "WARNING: Expect JTAG/SWD clock significantly slower than requested."
47 set compat [read_file /proc/device-tree/compatible]
48 set clocks_per_timing_loop 4
50 if {[string match *bcm2711* $compat]} {
52 } elseif {[string match *bcm2837* $compat] || [string match *bcm2710* $compat]} {
54 } elseif {[string match *bcm2836* $compat] || [string match *bcm2709* $compat]} {
56 } elseif {[string match *bcm2835* $compat] || [string match *bcm2708* $compat]} {
57 set clocks_per_timing_loop 6
61 echo "WARNING: Unknown type of the host SoC. Expect JTAG/SWD clock slower than requested."
64 set clock [get_max_cpu_clock 2000000]
65 set speed_coeff [expr { $clock / $clocks_per_timing_loop }]
67 # Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
68 # The coefficients depend on system clock and CPU frequency scaling.
69 bcm2835gpio speed_coeffs $speed_coeff $speed_offset
71 source [find interface/raspberrypi-gpio-connector.cfg]
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