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

# This is a STM32L4R9I discovery board with a single STM32L4R9AII6 chip.
# http://www.st.com/en/evaluation-tools/32l4r9idiscovery.html

# This is for using the onboard STLINK
source [find interface/stlink.cfg]

transport select hla_swd

# increase working area to 96KB
set WORKAREASIZE 0x18000

# enable stmqspi
set OCTOSPI1 1
set OCTOSPI2 0

source [find target/stm32l4x.cfg]

# OCTOSPI initialization
# octo: 8-line mode
proc octospi_init { octo } {
	global a b
	mmw 0x4002104C 0x001001FF 0				;# RCC_AHB2ENR |= OSPIMEN, GPIOAEN-GPIOIEN (enable clocks)
	mmw 0x40021050 0x00000300 0				;# RCC_AHB3ENR |= OSPI2EN, OSPI1EN (enable clocks)
	mmw 0x40021058 0x10000000 0				;# RCC_APB1ENR1 |= PWREN (enable clock)
	sleep 1									;# Wait for clock startup

	mmw 0x40007004 0x00000200 0				;# PWR_CR2 |= IOSV (required for use of GPOIG, cf. RM0432)

	mww 0x50061C04 0x00000000				;# OCTOSPIM_P1CR: disable Port 1
	mww 0x50061C08 0x03010111				;# OCTOSPIM_P2CR: assign Port 2 to OCTOSPI1

	# PG12: P2_NCS, PI06: P2_CLK, PG15: P2_DQS, PG10: P2_IO7, PG09: P2_IO6, PH10: P2_IO5,
	# PH09: P2_IO4, PH08: P2_IO3, PI09: P2_IO2, PI10: P2_IO1, PI11: P2_IO0

	# PG15:AF05:V, PG12:AF05:V, PG10:AF05:V, PG09:AF05:V, PH10:AF05:V, PH09:AF05:V
	# PH08:AF05:V, PI11:AF05:V, PI10:AF05:V, PI09:AF05:V, PI06:AF05:V

	# Port G: PG15:AF05:V, PG12:AF05:V, PG10:AF05:V, PG09:AF05:V
	mmw 0x48001800 0x82280000 0x41140000	;# MODER
	mmw 0x48001808 0xC33C0000 0x00000000	;# OSPEEDR
	mmw 0x48001824 0x50050550 0xA00A0AA0	;# AFRH

	# Port H: PH10:AF05:V, PH09:AF05:V, PH08:AF05:V
	mmw 0x48001C00 0x002A0000 0x00150000	;# MODER
	mmw 0x48001C08 0x003F0000 0x00000000	;# OSPEEDR
	mmw 0x48001C24 0x00000555 0x00000AAA	;# AFRH

	# Port I: PI11:AF05:V, PI10:AF05:V, PI09:AF05:V, PI06:AF05:V
	mmw 0x48002000 0x00A82000 0x00541000	;# MODER
	mmw 0x48002008 0x00FC3000 0x00000000	;# OSPEEDR
	mmw 0x48002020 0x05000000 0x0A000000	;# AFRL
	mmw 0x48002024 0x00005550 0x0000AAA0	;# AFRH

	# OCTOSPI1: memory-mapped 1-line read mode with 4-byte addresses
	mww 0xA0001130 0x00001000				;# OCTOSPI_LPTR: deactivate CS after 4096 clocks when FIFO is full
	mww 0xA0001000 0x3040000B				;# OCTOSPI_CR: FMODE=0x1, APMS=1, FTHRES=0, FSEL=0, DQM=0, TCEN=0
	mww 0xA0001008 0x01190100				;# OCTOSPI_DCR1: MTYP=0x1, FSIZE=0x19, CSHT=0x01, CKMODE=0, DLYBYP=0
	mww 0xA000100C 0x00000001				;# OCTOSPI_DCR2: PRESCALER=1

	mww 0xA0001108 0x00000000				;# OCTOSPI_TCR: SSHIFT=0, DHQC=0, DCYC=0x0
	mww 0xA0001100 0x01003101				;# OCTOSPI_CCR: DMODE=0x1, ABMODE=0x0, ADSIZE=0x3, ADMODE=0x1, ISIZE=0x0, IMODE=0x1
	mww 0xA0001110 0x00000013				;# OCTOSPI_IR: INSTR=READ4B

	if { $octo == 1 } {
		stmqspi cmd $a 1 0x71 0x00 0x00 0x00 0x00			;# Read Conf. Reg. 2, addr 0x00000000: DOPI, SOPI bits
		stmqspi cmd $a 0 0x06								;# Write Enable
		stmqspi cmd $a 1 0x05								;# Read Status Register
		stmqspi cmd $a 0 0x72 0x00 0x00 0x00 0x00 0x02		;# Write Conf. Reg. 2, addr 0x00000000: DTR OPI enable

		# OCTOSPI1: memory-mapped 8-line read mode with 4-byte addresses
		mww 0xA0001000 0x3040000B				;# OCTOSPI_CR: FMODE=0x3, APMS=1, FTHRES=0, FSEL=0, DQM=0, TCEN=1, EN=1
		mww 0xA0001108 0x10000006				;# OCTOSPI_TCR: SSHIFT=0, DHQC=1, DCYC=0x6
		mww 0xA0001100 0x2C003C1C				;# OCTOSPI_CCR: DTR, DMODE=0x4, ABMODE=0x0, ADSIZE=0x3, ADMODE=0x4, ISIZE=0x1, IMODE=0x4
		mww 0xA0001110 0x0000EE11				;# OCTOSPI_IR: INSTR=OCTA DTR Read

		flash probe $a							;# reload configuration from CR, TCR, CCR, IR register values

		stmqspi cmd $a 0 0x06								;# Write Enable
		stmqspi cmd $a 1 0x05 0x00 0x00 0x00 0x00			;# Read Status Register (note dummy address in 8-line mode)
		stmqspi cmd $a 0 0x04								;# Write Disable
		stmqspi cmd $a 1 0x05 0x00 0x00 0x00 0x00			;# Read Status Register (note dummy address in 8-line mode)
		stmqspi cmd $a 1 0x71 0x00 0x00 0x00 0x00			;# Read Conf. Reg. 2, addr 0x00000000: DOPI, SOPI bits
	}
}

$_TARGETNAME configure -event reset-init {
	mmw 0x40022000 0x00000003 0x0000000C	;# 3 WS for 72 MHz HCLK
	sleep 1
	mmw 0x40021000 0x00000100 0x00000000	;# HSI on
	mww 0x4002100C 0x01002432				;# RCC_PLLCFGR 72 MHz: PLLREN=1, PLLM=4, PLLN=36, PLLR=2, HSI
	mww 0x40021008 0x00008001				;# always HSI, APB1: /1, APB2: /1
	mmw 0x40021000 0x01000000 0x00000000	;# PLL on
	sleep 1
	mmw 0x40021008 0x00000003 0x00000000	;# switch to PLL
	sleep 1

	adapter speed 4000

	octospi_init 1
}