# SPDX-License-Identifier: GPL-2.0-or-later

# common script for stm32l5x and stm32u5x families

# Work-area is a space in RAM used for flash programming
# By default use 64kB
if { [info exists WORKAREASIZE] } {
	set _WORKAREASIZE $WORKAREASIZE
} else {
	set _WORKAREASIZE 0x10000
}

#jtag scan chain
if { [info exists CPUTAPID] } {
	set _CPUTAPID $CPUTAPID
} else {
	if { [using_jtag] } {
		# STM32L5x: RM0438 Rev5, Section 52.2.8 JTAG debug port - Table 425. JTAG-DP data registers
		# STM32U5x: RM0456 Rev1, Section 65.2.8 JTAG debug port - Table 661. JTAG-DP data registers
		# Corresponds to Cortex®-M33 JTAG debug port ID code
		set _CPUTAPID 0x0ba04477
	} {
		# SWD IDCODE (single drop, arm)
		set _CPUTAPID 0x0be12477
	}
}

swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu

if {[using_jtag]} {
	jtag newtap $_CHIPNAME bs -irlen 5
}

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_m -endian little -dap $_CHIPNAME.dap

# use non-secure RAM by default
$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0

# create sec/ns flash and otp memories (sizes will be probed)
flash bank $_CHIPNAME.flash_ns      stm32l4x 0x08000000 0 0 0 $_TARGETNAME
flash bank $_CHIPNAME.flash_alias_s stm32l4x 0x0C000000 0 0 0 $_TARGETNAME
flash bank $_CHIPNAME.otp           stm32l4x 0x0BFA0000 0 0 0 $_TARGETNAME

# Common knowledge tells JTAG speed should be <= F_CPU/6.
# F_CPU after reset is MSI 4MHz, so use F_JTAG = 500 kHz to stay on
# the safe side.
#
# Note that there is a pretty wide band where things are
# more or less stable, see http://review.openocd.org/3366
adapter speed 500

adapter srst delay 100
if {[using_jtag]} {
	jtag_ntrst_delay 100
}

reset_config srst_nogate

if {[using_hla]} {
	echo "Warn : The selected adapter does not support debugging this device in secure mode"
} else {
	# if srst is not fitted use SYSRESETREQ to
	# perform a soft reset
	cortex_m reset_config sysresetreq
}

proc stm32x5x_is_secure {} {
	# read Debug Security Control and Status Register (DSCSR) and check CDS (bit 16)
	set DSCSR [mrw 0xE000EE08]
	return [expr {($DSCSR & (1 << 16)) != 0}]
}

proc stm32x5x_ahb_ap_non_secure_access {} {
	# in HLA mode, non-secure debugging is possible without changing the AP CSW
	if {![using_hla]} {
		# SPROT=1=Non Secure access, Priv=1
		[[target current] cget -dap] apcsw 0x4B000000 0x4F000000
	}
}

proc stm32x5x_ahb_ap_secure_access {} {
	if {![using_hla]} {
		# SPROT=0=Secure access, Priv=1
		[[target current] cget -dap] apcsw 0x0B000000 0x4F000000
	}
}

$_TARGETNAME configure -event reset-start {
	# Reset clock is MSI (4 MHz)
	adapter speed 480
}

$_TARGETNAME configure -event examine-end {
	# DBGMCU_CR |= DBG_STANDBY | DBG_STOP
	mmw 0xE0044004 0x00000006 0

	# Stop watchdog counters during halt
	# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
	mmw 0xE0044008 0x00001800 0
}

$_TARGETNAME configure -event halted {
	set secure [stm32x5x_is_secure]

	if {$secure} {
		set secure_str "Secure"
		stm32x5x_ahb_ap_secure_access
	} else {
		set secure_str "Non-Secure"
		stm32x5x_ahb_ap_non_secure_access
	}

	# print the secure state only when it changes
	set _TARGETNAME [target current]
	global $_TARGETNAME.secure

	if {![info exists $_TARGETNAME.secure] || $secure != [set $_TARGETNAME.secure]} {
		echo "CPU in $secure_str state"
		# update saved security state
		set $_TARGETNAME.secure $secure
	}
}

$_TARGETNAME configure -event gdb-flash-erase-start {
	set use_secure_workarea 0
	# check if FLASH_OPTR.TZEN is enabled
	set FLASH_OPTR [mrw 0x40022040]
	if {[expr {$FLASH_OPTR & 0x80000000}] == 0} {
		echo "TZEN option bit disabled"
		stm32x5x_ahb_ap_non_secure_access
	} else {
		stm32x5x_ahb_ap_secure_access
		echo "TZEN option bit enabled"

		# check if FLASH_OPTR.RDP is not Level 0.5
		if {[expr {$FLASH_OPTR & 0xFF}] != 0x55} {
			set use_secure_workarea 1
		}
	}

	set _TARGETNAME [target current]
	set workarea_addr [$_TARGETNAME cget -work-area-phys]
	echo "workarea_addr $workarea_addr"

	if {$use_secure_workarea} {
		set workarea_addr [expr {$workarea_addr | 0x10000000}]
	} else {
		set workarea_addr [expr {$workarea_addr & ~0x10000000}]
	}

	$_TARGETNAME configure -work-area-phys $workarea_addr
}

tpiu create $_CHIPNAME.tpiu -dap $_CHIPNAME.dap -ap-num 0 -baseaddr 0xE0040000

lappend _telnet_autocomplete_skip _proc_pre_enable_$_CHIPNAME.tpiu
proc _proc_pre_enable_$_CHIPNAME.tpiu {_targetname} {
	targets $_targetname

	# Set TRACE_EN and TRACE_IOEN in DBGMCU_CR
	# Leave TRACE_MODE untouched (defaults to async).
	# When using sync change this value accordingly to configure trace pins
	# assignment
	mmw 0xE0044004 0x00000030 0
}

$_CHIPNAME.tpiu configure -event pre-enable "_proc_pre_enable_$_CHIPNAME.tpiu $_TARGETNAME"
