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

# This is an STM32L496G discovery board with a single STM32L496AGI6 chip.
# http://www.st.com/en/evaluation-tools/32l496gdiscovery.html

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

transport select dapdirect_swd

# increase working area to 96KB
set WORKAREASIZE 0x18000

# enable stmqspi
set QUADSPI 1

source [find target/stm32l4x.cfg]

# QUADSPI initialization
proc qspi_init { } {
	global a
	mmw 0x4002104C 0x000001FF 0				;# RCC_AHB2ENR |= GPIOAEN-GPIOIEN (enable clocks)
	mmw 0x40021050 0x00000100 0				;# RCC_AHB3ENR |= QSPIEN (enable clock)
	sleep 1									;# Wait for clock startup

	# PB11: BK1_NCS, PA03: CLK, PA06: BK1_IO3, PA07: BK1_IO2, PB00: BK1_IO1, PB01: BK1_IO0

	# PA07:AF10:V, PA06:AF10:V, PA03:AF10:V, PB11:AF10:V, PB01:AF10:V, PB00:AF10:V

	# Port A: PA07:AF10:V, PA06:AF10:V, PA03:AF10:V
	mmw 0x48000000 0x0000A080 0x00005040    ;# MODER
	mmw 0x48000008 0x0000F0C0 0x00000000    ;# OSPEEDR
	mmw 0x48000020 0xAA00A000 0x55005000    ;# AFRL

	# Port B: PB11:AF10:V, PB01:AF10:V, PB00:AF10:V
	mmw 0x48000400 0x0080000A 0x00400005    ;# MODER
	mmw 0x48000408 0x00C0000F 0x00000000    ;# OSPEEDR
	mmw 0x48000420 0x000000AA 0x00000055    ;# AFRL
	mmw 0x48000424 0x0000A000 0x00005000    ;# AFRH

	mww 0xA0001030 0x00001000				;# QUADSPI_LPTR: deactivate CS after 4096 clocks when FIFO is full
	mww 0xA0001000 0x01500008				;# QUADSPI_CR: PRESCALER=1, APMS=1, FTHRES=0, FSEL=0, DFM=0, SSHIFT=0, TCEN=1
	mww 0xA0001004 0x00160100				;# QUADSPI_DCR: FSIZE=0x16, 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 {
	mmw 0x40022000 0x00000004 0x00000003	;# 4 WS for 72 MHz HCLK
	sleep 1
	mmw 0x40021000 0x00000100 0x00000000	;# HSI on
	mww 0x4002100C 0x01002432				;# 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

	qspi_init
}