diff options
Diffstat (limited to 'tcl/target/davinci.cfg')
| -rw-r--r-- | tcl/target/davinci.cfg | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/tcl/target/davinci.cfg b/tcl/target/davinci.cfg new file mode 100644 index 0000000..0a3da27 --- /dev/null +++ b/tcl/target/davinci.cfg @@ -0,0 +1,170 @@ +# +# 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. +# +# REVISIT there are minor differences between the PLL controllers. +# Handle those; maybe check the ID register. This version behaves +# for at least the dm355. On dm6446 and dm357 the PLLRST polarity +# is different. On dm365 there are more changes. +# +proc pll_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] } { + 1et 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 + 0x011c] $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 } + } + + # 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 +} + +# execute non-DSP PSC transition(s) set up by psc_enable +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 } +} |