AM335x: Disable watchdog on 'reset halt'

[openocd] / tcl / target / am335x.cfg

diff --git a/tcl/target/am335x.cfg b/tcl/target/am335x.cfg
index 6fad92c311db7c183b10f7a0f006e15d6398eed4..3ca196b11977a98e52deeb91db2c016afa955213 100644 (file)
--- a/tcl/target/am335x.cfg
+++ b/tcl/target/am335x.cfg
@@ -1,48 +1,75 @@
 source [find target/icepick.cfg]
 
 if { [info exists CHIPNAME] } {
-   set _CHIPNAME $CHIPNAME
+       set _CHIPNAME $CHIPNAME
 } else {
-   set _CHIPNAME am335x
+       set _CHIPNAME am335x
 }
 
-#
-# M3 DAP
-#
-if { [info exists M3_DAP_TAPID] } {
-       set _M3_DAP_TAPID $M3_DAP_TAPID
+# set the taps to be enabled by default. this can be overridden
+# by setting DEFAULT_TAPS in a separate configuration file
+# or directly on the command line.
+if { [info exists DEFAULT_TAPS] } {
+       set _DEFAULT_TAPS "$DEFAULT_TAPS"
 } else {
-       set _M3_DAP_TAPID 0x4b6b902f
+       set _DEFAULT_TAPS "$_CHIPNAME.dap"
 }
-jtag newtap $_CHIPNAME m3_dap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_M3_DAP_TAPID -disable
-jtag configure $_CHIPNAME.m3_dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 11"
 
 #
 # Main DAP
 #
 if { [info exists DAP_TAPID] } {
-   set _DAP_TAPID $DAP_TAPID
+       set _DAP_TAPID $DAP_TAPID
 } else {
-   set _DAP_TAPID 0x4b6b902f
+       set _DAP_TAPID 0x4b6b902f
 }
 jtag newtap $_CHIPNAME dap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_DAP_TAPID -disable
-jtag configure $_CHIPNAME.dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 12"
+jtag configure $_CHIPNAME.dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 12 0"
+
+#
+# M3 DAP
+#
+if { [info exists M3_DAP_TAPID] } {
+       set _M3_DAP_TAPID $M3_DAP_TAPID
+} else {
+       set _M3_DAP_TAPID 0x4b6b902f
+}
+jtag newtap $_CHIPNAME m3_dap -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_M3_DAP_TAPID -disable
+jtag configure $_CHIPNAME.m3_dap -event tap-enable "icepick_d_tapenable $_CHIPNAME.jrc 11 0"
 
 #
 # ICEpick-D (JTAG route controller)
 #
 if { [info exists JRC_TAPID] } {
-   set _JRC_TAPID $JRC_TAPID
+       set _JRC_TAPID $JRC_TAPID
 } else {
-   set _JRC_TAPID 0x0b94402f
+       set _JRC_TAPID 0x0b94402f
 }
 jtag newtap $_CHIPNAME jrc -irlen 6 -ircapture 0x1 -irmask 0x3f -expected-id $_JRC_TAPID -ignore-version
-jtag configure $_CHIPNAME.jrc -event setup "jtag tapenable $_CHIPNAME.dap"
+jtag configure $_CHIPNAME.jrc -event setup {
+       global _DEFAULT_TAPS
+       enable_default_taps $_DEFAULT_TAPS
+}
 # some TCK tycles are required to activate the DEBUG power domain
 jtag configure $_CHIPNAME.jrc -event post-reset "runtest 100"
 
 #
-# Cortex A8 target
+# helper function that enables all taps passed as argument
+#
+proc enable_default_taps { taps } {
+       foreach tap $taps {
+               jtag tapenable $tap
+       }
+}
+
+#
+# Cortex-M3 target
+#
+set _TARGETNAME_2 $_CHIPNAME.m3
+target create $_TARGETNAME_2 cortex_m -chain-position $_CHIPNAME.m3_dap
+
+#
+# Cortex-A8 target
 #
 set _TARGETNAME $_CHIPNAME.cpu
 target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.dap -dbgbase 0x80001000
@@ -50,8 +77,34 @@ target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.dap -dbgbase 0x80
 # SRAM: 64K at 0x4030.0000; use the first 16K
 $_TARGETNAME configure -work-area-phys 0x40300000 -work-area-size 0x4000
 
-$_TARGETNAME configure -event gdb-attach {
-   cortex_a dbginit
-   halt
-}
 
+# when putting the target into 'reset halt', we need to disable the watchdog as
+# it would otherwise trigger while we're in JTAG
+# FIXME: unify with target/am437x.cfg
+source [find mem_helper.tcl]
+set  WDT1_BASE_ADDR                  0x44e35000
+set  WDT1_W_PEND_WSPR                [expr       $WDT1_BASE_ADDR     +  0x0034]
+set  WDT1_WSPR                       [expr       $WDT1_BASE_ADDR     +  0x0048]
+proc disable_watchdog { } {
+       global WDT1_WSPR
+       global WDT1_W_PEND_WSPR
+       global _TARGETNAME
+
+       set curstate [$_TARGETNAME curstate]
+
+       if { [string compare $curstate halted] == 0 } {
+               set WDT_DISABLE_SEQ1    0xaaaa
+               set WDT_DISABLE_SEQ2    0x5555
+
+               mww phys $WDT1_WSPR $WDT_DISABLE_SEQ1
+
+               # Empty body to make sure this executes as fast as possible.
+               # We don't want any delays here otherwise romcode might start
+               # executing and end up changing state of certain IPs.
+               while { [expr [mrw $WDT1_W_PEND_WSPR] & 0x10] } { }
+
+               mww phys $WDT1_WSPR $WDT_DISABLE_SEQ2
+               while { [expr [mrw $WDT1_W_PEND_WSPR] & 0x10] } { }
+       }
+}
+$_TARGETNAME configure -event reset-end { disable_watchdog }