openocd/tcl/target/davinci.cfg

#
# Utility code for DaVinci-family chips
#

# davinci_pinmux:  assigns PINMUX$reg <== $value
proc davinci_pinmux {soc reg value} {
	mww [expr [dict get $soc sysbase] + 4 * $reg] $value
}

# mrw: "memory read word", returns value of $reg
proc mrw {reg} {
	set value ""
	ocd_mem2array value 32 $reg 1
	return $value(0)
}

# mmw: "memory modify word", updates value of $reg
#	$reg <== ((value & ~$clearbits) | $setbits)
proc mmw {reg setbits clearbits} {
	set old [mrw $reg]
	set new [expr ($old & ~$clearbits) | $setbits]
	mww $reg $new
}

#
# pll_setup: initialize PLL
#  - pll_addr ... physical addr of controller
#  - mult ... pll multiplier
#  - config ... dict mapping { prediv, postdiv, div[1-9] } to dividers
#
# For PLLs that don't have a given register (e.g. plldiv8), or where a
# given divider is non-programmable, caller provides *NO* config mapping.
#

# PLL version 0x02: tested on dm355
# REVISIT:  On dm6446/dm357 the PLLRST polarity is different.
proc pll_v02_setup {pll_addr mult config} {
	set pll_ctrl_addr [expr $pll_addr + 0x100]
	set pll_ctrl [mrw $pll_ctrl_addr]

	# 1 - clear CLKMODE (bit 8) iff using on-chip oscillator
	# NOTE:  this assumes we should clear that bit
	set pll_ctrl [expr $pll_ctrl & ~0x0100]
	mww $pll_ctrl_addr $pll_ctrl

	# 2 - clear PLLENSRC (bit 5)
	set pll_ctrl [expr $pll_ctrl & ~0x0020]
	mww $pll_ctrl_addr $pll_ctrl

	# 3 - clear PLLEN (bit 0) ... enter bypass mode
	set pll_ctrl [expr $pll_ctrl & ~0x0001]
	mww $pll_ctrl_addr $pll_ctrl

	# 4 - wait at least 4 refclk cycles
	sleep 1

	# 5 - set PLLRST (bit 3)
	set pll_ctrl [expr $pll_ctrl | 0x0008]
	mww $pll_ctrl_addr $pll_ctrl

	# 6 - set PLLDIS (bit 4)
	set pll_ctrl [expr $pll_ctrl | 0x0010]
	mww $pll_ctrl_addr $pll_ctrl

	# 7 - clear PLLPWRDN (bit 1)
	set pll_ctrl [expr $pll_ctrl & ~0x0002]
	mww $pll_ctrl_addr $pll_ctrl

	# 8 - clear PLLDIS (bit 4)
	set pll_ctrl [expr $pll_ctrl & ~0x0010]
	mww $pll_ctrl_addr $pll_ctrl

	# 9 - optional:  write prediv, postdiv, and pllm
	# NOTE:  for dm355 PLL1, postdiv is controlled via MISC register
	mww [expr $pll_addr + 0x0110] [expr ($mult - 1) & 0xff]
	if { [dict exists $config prediv] } {
		set div [dict get $config prediv]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0114] $div
	}
	if { [dict exists $config postdiv] } {
		set div [dict get $config postdiv]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0128] $div
	}

	# 10 - optional:  set plldiv1, plldiv2, ...
	# NOTE:  this assumes some registers have their just-reset values:
	#	- PLLSTAT.GOSTAT is clear when we enter
	#	- ALNCTL has everything set
	set go 0
	if { [dict exists $config div1] } {
		set div [dict get $config div1]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0118] $div
		set go 1
	}
	if { [dict exists $config div2] } {
		set div [dict get $config div2]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x011c] $div
		set go 1
	}
	if { [dict exists $config div3] } {
		set div [dict get $config div3]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0120] $div
		set go 1
	}
	if { [dict exists $config div4] } {
		set div [dict get $config div4]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0160] $div
		set go 1
	}
	if { [dict exists $config div5] } {
		set div [dict get $config div5]
		set div [expr 0x8000 | ($div - 1)]
		mww [expr $pll_addr + 0x0164] $div
		set go 1
	}
	if {$go != 0} {
		# write pllcmd.GO; poll pllstat.GO
		mww [expr $pll_addr + 0x0138] 0x01
		set pllstat [expr $pll_addr + 0x013c]
		while {[expr [mrw $pllstat] & 0x01] != 0} { sleep 1 }
	}
	mww [expr $pll_addr + 0x0138] 0x00

	# 11 - wait at least 5 usec for reset to finish
	# (assume covered by overheads including JTAG messaging)

	# 12 - clear PLLRST (bit 3)
	set pll_ctrl [expr $pll_ctrl & ~0x0008]
	mww $pll_ctrl_addr $pll_ctrl

	# 13 - wait at least 8000 refclk cycles for PLL to lock
	# if we assume 24 MHz (slowest osc), that's 1/3 msec
	sleep 3

	# 14 - set PLLEN (bit 0) ... leave bypass mode
	set pll_ctrl [expr $pll_ctrl | 0x0001]
	mww $pll_ctrl_addr $pll_ctrl
}

# NOTE:  dm6446 requires EMURSTIE set in MDCTL before certain
# modules can be enabled.

# prepare a non-DSP module to be enabled; finish with psc_go
proc psc_enable {module} {
	set psc_addr 0x01c41000
	# write MDCTL
	mmw [expr $psc_addr + 0x0a00 + (4 * $module)] 0x03 0x1f
}

# prepare a non-DSP module to be reset; finish with psc_go
proc psc_reset {module} {
	set psc_addr 0x01c41000
	# write MDCTL
	mmw [expr $psc_addr + 0x0a00 + (4 * $module)] 0x01 0x1f
}

# execute non-DSP PSC transition(s) set up by psc_enable, psc_reset, etc
proc psc_go {} {
	set psc_addr 0x01c41000
	set ptstat_addr [expr $psc_addr + 0x0128]

	# just in case PTSTAT.go isn't clear
	while { [expr [mrw $ptstat_addr] & 0x01] != 0 } { sleep 1 }

	# write PTCMD.go ... ignoring any DSP power domain
	mww [expr $psc_addr + 0x0120] 1

	# wait for PTSTAT.go to clear (again ignoring DSP power domain)
	while { [expr [mrw $ptstat_addr] & 0x01] != 0 } { sleep 1 }
}

#
# A reset using only SRST is a "Warm Reset", resetting everything in the
# chip except ARM emulation (and everything _outside_ the chip that hooks
# up to SRST).  But many boards don't expose SRST via their JTAG connectors
# (it's not present on TI-14 headers).
#
# From the chip-only perspective, a "Max Reset" is a "Warm" reset ... except
# without any board-wide side effects, since it's triggered using JTAG using
# either (a) ARM watchdog timer, or (b) ICEpick.
#
proc davinci_wdog_reset {} {
	set timer2_phys 0x01c21c00

	# NOTE -- on entry
	#   - JTAG communication with the ARM *must* be working OK; this
	#     may imply using adaptive clocking or disabling WFI-in-idle
	#   - current target must be the DaVinci ARM
	#   - that ARM core must be halted
	#   - timer2 clock is still enabled (PSC 29 on most chips)

	#
	# Part I -- run regardless of being halted via JTAG
	#
	# NOTE:  for now, we assume there's no DSP that could control the
	# watchdog; or, equivalently, SUSPSRC.TMR2SRC says the watchdog
	# suspend signal is controlled via ARM emulation suspend.
	#

	# EMUMGT_CLKSPEED: write FREE bit to run despite emulation halt
	mww phys [expr $timer2_phys + 0x28] 0x00004000

	#
	# Part II -- in case watchdog hasn't been set up
	#

	# TCR: disable, force internal clock source
	mww phys [expr $timer2_phys + 0x20] 0

	# TGCR: reset, force to 64-bit wdog mode, un-reset ("initial" state)
	mww phys [expr $timer2_phys + 0x24] 0
	mww phys [expr $timer2_phys + 0x24] 0x110b

	# clear counter (TIM12, TIM34) and period (PRD12, PRD34) registers
	# so watchdog triggers ASAP
	mww phys [expr $timer2_phys + 0x10] 0
	mww phys [expr $timer2_phys + 0x14] 0
	mww phys [expr $timer2_phys + 0x18] 0
	mww phys [expr $timer2_phys + 0x1c] 0

	# WDTCR: put into pre-active state, then active
	mww phys [expr $timer2_phys + 0x28] 0xa5c64000
	mww phys [expr $timer2_phys + 0x28] 0xda7e4000

	#
	# Part III -- it's ready to rumble
	#

	# WDTCR: write invalid WDKEY to trigger reset
	mww phys [expr $timer2_phys + 0x28] 0x00004000
}