tcl/target/am335x.cfg

   1 # SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 source [find target/icepick.cfg]
   4
   5 if { [info exists CHIPNAME] } {
   6         set _CHIPNAME $CHIPNAME
   7 } else {
   8         set _CHIPNAME am335x
   9 }
  10
  11 # set the taps to be enabled by default. this can be overridden
  12 # by setting DEFAULT_TAPS in a separate configuration file
  13 # or directly on the command line.
  14 if { [info exists DEFAULT_TAPS] } {
  15         set _DEFAULT_TAPS "$DEFAULT_TAPS"
  16 } else {
  17         set _DEFAULT_TAPS "$_CHIPNAME.tap"
  18 }
  19
  20 #
  21 # Main DAP
  22 #
  23 if { [info exists DAP_TAPID] } {
  24         set _DAP_TAPID $DAP_TAPID
  25 } else {
  26         set _DAP_TAPID 0x4b6b902f
  27 }
  28 jtag newtap $_CHIPNAME tap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_DAP_TAPID -disable
  29 jtag configure $_CHIPNAME.tap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 12 0"
  30 dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.tap
  31
  32 #
  33 # M3 DAP
  34 #
  35 if { [info exists M3_DAP_TAPID] } {
  36         set _M3_DAP_TAPID $M3_DAP_TAPID
  37 } else {
  38         set _M3_DAP_TAPID 0x4b6b902f
  39 }
  40 jtag newtap $_CHIPNAME m3_tap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_M3_DAP_TAPID -disable
  41 jtag configure $_CHIPNAME.m3_tap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 11 0"
  42 dap create $_CHIPNAME.m3_dap -chain-position $_CHIPNAME.m3_tap
  43
  44 #
  45 # ICEpick-D (JTAG route controller)
  46 #
  47 if { [info exists JRC_TAPID] } {
  48         set _JRC_TAPID $JRC_TAPID
  49 } else {
  50         set _JRC_TAPID 0x0b94402f
  51 }
  52 jtag newtap $_CHIPNAME jrc -irlen 6 -ircapture 0x1 -irmask 0x3f -expected-id $_JRC_TAPID -ignore-version
  53 jtag configure $_CHIPNAME.jrc -event setup {
  54         global _DEFAULT_TAPS
  55         enable_default_taps $_DEFAULT_TAPS
  56 }
  57 # some TCK tycles are required to activate the DEBUG power domain
  58 jtag configure $_CHIPNAME.jrc -event post-reset "runtest 100"
  59
  60 #
  61 # helper function that enables all taps passed as argument
  62 #
  63 proc enable_default_taps { taps } {
  64         foreach tap $taps {
  65                 jtag tapenable $tap
  66         }
  67 }
  68
  69 #
  70 # Cortex-M3 target
  71 #
  72 set _TARGETNAME_2 $_CHIPNAME.m3
  73 target create $_TARGETNAME_2 cortex_m -dap $_CHIPNAME.m3_dap
  74
  75 #
  76 # Cortex-A8 target
  77 #
  78 set _TARGETNAME $_CHIPNAME.cpu
  79 target create $_TARGETNAME cortex_a -dap $_CHIPNAME.dap -dbgbase 0x80001000
  80
  81 # SRAM: 64K at 0x4030.0000; use the first 16K
  82 $_TARGETNAME configure -work-area-phys 0x40300000 -work-area-size 0x4000
  83
  84
  85 # when putting the target into 'reset halt', we need to disable the watchdog as
  86 # it would otherwise trigger while we're in JTAG
  87 # FIXME: unify with target/am437x.cfg
  88 source [find mem_helper.tcl]
  89 set  WDT1_BASE_ADDR                  0x44e35000
  90 set  WDT1_W_PEND_WSPR                [expr       {$WDT1_BASE_ADDR     +  0x0034}]
  91 set  WDT1_WSPR                       [expr       {$WDT1_BASE_ADDR     +  0x0048}]
  92 proc disable_watchdog { } {
  93         global WDT1_WSPR
  94         global WDT1_W_PEND_WSPR
  95         global _TARGETNAME
  96
  97         set curstate [$_TARGETNAME curstate]
  98
  99         if { [string compare $curstate halted] == 0 } {
 100                 set WDT_DISABLE_SEQ1    0xaaaa
 101                 set WDT_DISABLE_SEQ2    0x5555
 102
 103                 mww phys $WDT1_WSPR $WDT_DISABLE_SEQ1
 104
 105                 # Empty body to make sure this executes as fast as possible.
 106                 # We don't want any delays here otherwise romcode might start
 107                 # executing and end up changing state of certain IPs.
 108                 while { [expr {[mrw $WDT1_W_PEND_WSPR] & 0x10}] } { }
 109
 110                 mww phys $WDT1_WSPR $WDT_DISABLE_SEQ2
 111                 while { [expr {[mrw $WDT1_W_PEND_WSPR] & 0x10}] } { }
 112         }
 113 }
 114 $_TARGETNAME configure -event reset-end { disable_watchdog }