DM36x: Disable unused SYSCLKs

[openocd.git] / 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 ""
        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
}

# PLL version 0x03: tested on dm365
proc pll_v03_setup {pll_addr mult config} {
        set pll_ctrl_addr [expr $pll_addr + 0x100]
        set pll_secctrl_addr [expr $pll_addr + 0x108]
        set pll_ctrl [mrw $pll_ctrl_addr]

        # 1 - power up the PLL
        set pll_ctrl [expr $pll_ctrl & ~0x0002]
        mww $pll_ctrl_addr $pll_ctrl

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

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

        # 3 - wait at least 4 refclk cycles
        sleep 1

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

        # 5 - wait at least 5 usec
        sleep 1

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

        # 9 - optional:  write prediv, postdiv, and pllm
        mww [expr $pll_addr + 0x0110] [expr ($mult / 2) & 0x1ff]
        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 - write start sequence to PLLSECCTL
        mww $pll_secctrl_addr 0x00470000
        mww $pll_secctrl_addr 0x00460000
        mww $pll_secctrl_addr 0x00400000
        mww $pll_secctrl_addr 0x00410000

        # 11 - optional:  set plldiv1, plldiv2, ...
        # NOTE:  this assumes some registers have their just-reset values:
        #       - PLLSTAT.GOSTAT is clear when we enter
        set aln 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 aln [expr $aln | 0x1]
        } else {
                mww [expr $pll_addr + 0x0118] 0
        }
        if { [dict exists $config div2] } {
                set div [dict get $config div2]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x011c] $div
                set aln [expr $aln | 0x2]
        } else {
                mww [expr $pll_addr + 0x011c] 0
        }
        if { [dict exists $config div3] } {
                set div [dict get $config div3]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0120] $div
                set aln [expr $aln | 0x4]
        } else {
                mww [expr $pll_addr + 0x0120] 0
        }
        if { [dict exists $config div4] } {
                set div [dict get $config div4]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0160] $div
                set aln [expr $aln | 0x8]
        } else {
                mww [expr $pll_addr + 0x0160] 0
        }
        if { [dict exists $config div5] } {
                set div [dict get $config div5]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0164] $div
                set aln [expr $aln | 0x10]
        } else {
                mww [expr $pll_addr + 0x0164] 0
        }
        if { [dict exists $config div6] } {
                set div [dict get $config div6]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0168] $div
                set aln [expr $aln | 0x20]
        } else {
                mww [expr $pll_addr + 0x0168] 0
        }
        if { [dict exists $config div7] } {
                set div [dict get $config div7]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x016c] $div
                set aln [expr $aln | 0x40]
        } else {
                mww [expr $pll_addr + 0x016c] 0
        }
        if { [dict exists $config div8] } {
                set div [dict get $config div8]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0170] $div
                set aln [expr $aln | 0x80]
        } else {
                mww [expr $pll_addr + 0x0170] 0
        }
        if { [dict exists $config div9] } {
                set div [dict get $config div9]
                set div [expr 0x8000 | ($div - 1)]
                mww [expr $pll_addr + 0x0174] $div
                set aln [expr $aln | 0x100]
        } else {
                mww [expr $pll_addr + 0x0174] 0
        }
        if {$aln != 0} {
                # clear pllcmd.GO
                mww [expr $pll_addr + 0x0138] 0x00
                # write alingment flags
                mww [expr $pll_addr + 0x0140] $aln
                # 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
        set addr [dict get $config ctladdr]
        while {[expr [mrw $addr] & 0x0e000000] != 0x0e000000} { sleep 1 }

        # 12 - 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
}