riscv-openocd/tcl/target/atheros_ar9331.cfg

if { [info exists CHIPNAME] } {
	set _CHIPNAME $_CHIPNAME
} else {
	set _CHIPNAME ar9331
}

if { [info exists CPUTAPID] } {
	set _CPUTAPID $CPUTAPID
} else {
	set _CPUTAPID 0x00000001
}

jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id $_CPUTAPID

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME mips_m4k -endian big -chain-position $_TARGETNAME

proc ar9331_25mhz_pll_init {} {
	mww 0xb8050008 0x00018004	;# bypass PLL; AHB_POST_DIV - ratio 4
	mww 0xb8050004 0x00000352	;# 34000(ns)/40ns(25MHz) = 0x352 (850)
	mww 0xb8050000 0x40818000	;# Power down control for CPU PLL
					;# OUTDIV | REFDIV | DIV_INT
	mww 0xb8050010 0x001003e8	;# CPU PLL Dither FRAC Register
					;# (disabled?)
	mww 0xb8050000 0x00818000	;# Power on | OUTDIV | REFDIV | DIV_INT
	mww 0xb8050008 0x00008000	;# remove bypass;
					;# AHB_POST_DIV - ratio 2
}

proc ar9331_ddr1_init {} {
	mww 0xb8000000 0x7fbc8cd0       ;# DDR_CONFIG - lots of DRAM confs
	mww 0xb8000004 0x9dd0e6a8	;# DDR_CONFIG2 - more DRAM confs

	mww 0xb8000010 0x8	;# Forces a PRECHARGE ALL cycle
	mww 0xb8000008 0x133	;# mode reg: 0x133 - default
	mww 0xb8000010 0x1	;# Forces an MRS update cycl
	mww 0xb800000c 0x2	;# Extended mode register value.
				;# default 0x2 - Reset to weak driver, DLL on
	mww 0xb8000010 0x2	;# Forces an EMRS update cycle
	mww 0xb8000010 0x8	;# Forces a PRECHARGE ALL cycle
	mww 0xb8000008 0x33	;# mode reg: remove some bit?
	mww 0xb8000010 0x1	;# Forces an MRS update cycl
	mww 0xb8000014 0x4186	;# enable refres: bit(14) - set refresh rate
	mww 0xb800001c 0x8	;# This register is used along with DQ Lane 0,
				;# DQ[7:0], DQS_0
	mww 0xb8000020 0x9	;# This register is used along with DQ Lane 1,
				;# DQ[15:8], DQS_1.
	mww 0xb8000018 0xff	;# DDR read and capture bit mask.
				;# Each bit represents a cycle of valid data.
}

proc ar9331_ddr2_init {} {
	mww 0xb8000000 0x7fbc8cd0	;# DDR_CONFIG - lots of DRAM confs
	mww 0xb8000004 0x9dd0e6a8	;# DDR_CONFIG2 - more DRAM confs

	mww 0xb800008c 0x00000a59
	mww 0xb8000010 0x00000008	;# PRECHARGE ALL cycle

	mww 0xb8000090 0x00000000
	mww 0xb8000010 0x00000010	;# EMR2S update cycle

	mww 0xb8000094 0x00000000
	mww 0xb8000010 0x00000020	;# EMR3S update cycle

	mww 0xb800000c 0x00000000
	mww 0xb8000010 0x00000002	;# EMRS update cycle

	mww 0xb8000008 0x00000100
	mww 0xb8000010 0x00000001	;# MRS update cycle

	mww 0xb8000010 0x00000008	;# PRECHARGE ALL cycle

	mww 0xb8000010 0x00000004
	mww 0xb8000010 0x00000004	;# AUTO REFRESH cycle

	mww 0xb8000008 0x00000a33
	mww 0xb8000010 0x00000001	;# MRS update cycle

	mww 0xb800000c 0x00000382
	mww 0xb8000010 0x00000002	;# EMRS update cycle

	mww 0xb800000c 0x00000402
	mww 0xb8000010 0x00000002	;# EMRS update cycle

	mww 0xb8000014 0x00004186	;# DDR_REFRESH
	mww 0xb800001c 0x00000008	;# DDR_TAP_CTRL0
	mww 0xb8000020 0x00000009	;# DDR_TAP_CTRL1

	;# DDR read and capture bit mask.
	;# Each bit represents a cycle of valid data.
	;# 0xff: use 16-bit DDR
	mww 0xb8000018 0x000000ff
}