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

# This is an STM32F412G discovery board with a single STM32F412ZGT6 chip.
# http://www.st.com/en/evaluation-tools/32f412gdiscovery.html

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

transport select hla_swd

# increase working area to 128KB
set WORKAREASIZE 0x20000

# enable stmqspi
set QUADSPI 1

source [find target/stm32f4x.cfg]

# QUADSPI initialization
proc qspi_init { } {
	global a
	mmw 0x40023830 0x000000FF 0				;# RCC_AHB1ENR |= GPIOAEN-GPIOHEN (enable clocks)
	mmw 0x40023838 0x00000002 0				;# RCC_AHB3ENR |= QSPIEN (enable clock)
	sleep 1									;# Wait for clock startup

	# PB02: CLK, PG06: BK1_NCS, PF06: BK1_IO3, PF07: BK1_IO2, PF09: BK1_IO1, PF08: BK1_IO0

	# PB02:AF09:V, PF09:AF10:V, PF08:AF10:V, PF07:AF09:V, PF06:AF09:V, PG06:AF10:V

	# Port B: PB02:AF09:V
	mmw 0x40020400 0x00000020 0x00000010	;# MODER
	mmw 0x40020408 0x00000030 0x00000000	;# OSPEEDR
	mmw 0x40020420 0x00000900 0x00000600	;# AFRL

	# Port F: PF09:AF10:V, PF08:AF10:V, PF07:AF09:V, PF06:AF09:V
	mmw 0x40021400 0x000AA000 0x00055000	;# MODER
	mmw 0x40021408 0x000FF000 0x00000000	;# OSPEEDR
	mmw 0x40021420 0x99000000 0x66000000	;# AFRL
	mmw 0x40021424 0x000000AA 0x00000055	;# AFRH

	# Port G: PG06:AF10:V
	mmw 0x40021800 0x00002000 0x00001000	;# MODER
	mmw 0x40021808 0x00003000 0x00000000	;# OSPEEDR
	mmw 0x40021820 0x0A000000 0x05000000	;# AFRL

	mww 0xA0001030 0x00001000				;# QUADSPI_LPTR: deactivate CS after 4096 clocks when FIFO is full
	mww 0xA0001000 0x03500008				;# QUADSPI_CR: PRESCALER=3, APMS=1, FTHRES=0, FSEL=0, DFM=0, SSHIFT=0, TCEN=1
	mww 0xA0001004 0x00170100				;# QUADSPI_DCR: FSIZE=0x17, CSHT=0x01, CKMODE=0
	mmw 0xA0001000 0x00000001 0				;# QUADSPI_CR: EN=1

	# 1-line spi mode
	mww 0xA0001014 0x000003F5				;# QUADSPI_CCR: FMODE=0x0, DMODE=0x0, DCYC=0x0, ADSIZE=0x0, ADMODE=0x0, IMODE=0x3, INSTR=RSTQIO
	sleep 1

	# memory-mapped read mode with 3-byte addresses
	mww 0xA0001014 0x0D002503				;# QUADSPI_CCR: FMODE=0x3, DMODE=0x1, DCYC=0x0, ADSIZE=0x2, ADMODE=0x1, IMODE=0x1, INSTR=READ
}

$_TARGETNAME configure -event reset-init {
	mww 0x40023C00 0x00000003				;# 3 WS for 96 MHz HCLK
	sleep 1
	mww 0x40023804 0x24001808				;# 96 MHz: HSI, PLLM=8, PLLN=96, PLLP=2
	mww 0x40023808 0x00001000				;# APB1: /2, APB2: /1
	mmw 0x40023800 0x01000000 0x00000000	;# PLL on
	sleep 1
	mmw 0x40023808 0x00000002 0x00000000	;# switch to PLL
	sleep 1

	adapter speed 4000

	qspi_init
}