1 # SPDX-License-Identifier: GPL-2.0-or-later
3 # TI/Luminary Stellaris LM3S chip family
5 # Some devices have errata in returning their device class.
6 # DEVICECLASS is provided as a manual override
7 # Manual setting of a device class of 0xff is not allowed
11 if { [info exists DEVICECLASS] } {
12 set _DEVICECLASS $DEVICECLASS
17 # Luminary chips support both JTAG and SWD transports.
18 # Adapt based on what transport is active.
19 source [find target/swj-dp.tcl]
21 # For now we ignore the SPI and UART options, which
22 # are usable only for ISP style initial flash programming.
24 if { [info exists CHIPNAME] } {
25 set _CHIPNAME $CHIPNAME
30 # CPU TAP ID 0x1ba00477 for early Sandstorm parts
31 # CPU TAP ID 0x2ba00477 for later SandStorm parts, e.g. lm3s811 Rev C2
32 # CPU TAP ID 0x3ba00477 for Cortex-M3 r1p2 (on Fury, DustDevil)
33 # CPU TAP ID 0x4ba00477 for Cortex-M3 r2p0 (on Tempest, Firestorm)
34 # CPU TAP ID 0x4ba00477 for Cortex-M4 r0p1 (on Blizzard)
35 # ... we'll ignore the JTAG version field, rather than list every
36 # chip revision that turns up.
37 if { [info exists CPUTAPID] } {
38 set _CPUTAPID $CPUTAPID
40 set _CPUTAPID 0x0ba00477
43 # SWD DAP, and JTAG TAP, take same params for now;
44 # ... even though SWD ignores all except TAPID, and
45 # JTAG shouldn't need anything more then irlen. (and TAPID).
46 swj_newdap $_CHIPNAME cpu -irlen 4 -irmask 0xf \
47 -expected-id $_CPUTAPID -ignore-version
48 dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
50 if { [info exists WORKAREASIZE] } {
51 set _WORKAREASIZE $WORKAREASIZE
53 # default to 2K working area
54 set _WORKAREASIZE 0x800
57 set _TARGETNAME $_CHIPNAME.cpu
58 target create $_TARGETNAME cortex_m -dap $_CHIPNAME.dap
60 # 8K working area at base of ram, not backed up
62 # NOTE: you may need or want to reconfigure the work area;
63 # some parts have just 6K, and you may want to use other
64 # addresses (at end of mem not beginning) or back it up.
65 $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE
67 # JTAG speed ... slow enough to work with a 12 MHz RC oscillator;
68 # LM3S parts don't support RTCK
70 # NOTE: this may be increased by a reset-init handler, after it
71 # configures and enables the PLL. Or you might need to decrease
72 # this, if you're using a slower clock.
75 source [find mem_helper.tcl]
77 proc reset_peripherals {family} {
79 source [find chip/ti/lm3s/lm3s.tcl]
81 echo "Resetting Core Peripherals"
83 # Disable the PLL and the system clock divider (nop if disabled)
84 mmw $SYSCTL_RCC 0 $SYSCTL_RCC_USESYSDIV
85 mmw $SYSCTL_RCC2 $SYSCTL_RCC2_BYPASS2 0
87 # RCC and RCC2 to their reset values
88 mww $SYSCTL_RCC [expr {0x078e3ad0 | ([mrw $SYSCTL_RCC] & $SYSCTL_RCC_MOSCDIS)}]
89 mww $SYSCTL_RCC2 0x07806810
90 mww $SYSCTL_RCC 0x078e3ad1
92 # Reset the deep sleep clock configuration register
93 mww $SYSCTL_DSLPCLKCFG 0x07800000
95 # Reset the clock gating registers
96 mww $SYSCTL_RCGC0 0x00000040
99 mww $SYSCTL_SCGC0 0x00000040
102 mww $SYSCTL_DCGC0 0x00000040
106 # Reset the remaining SysCtl registers
107 mww $SYSCTL_PBORCTL 0
109 mww $SYSCTL_GPIOHBCTL 0
110 mww $SYSCTL_MOSCCTL 0
111 mww $SYSCTL_PIOSCCAL 0
112 mww $SYSCTL_I2SMCLKCFG 0
114 # Reset the peripherals
115 mww $SYSCTL_SRCR0 0xffffffff
116 mww $SYSCTL_SRCR1 0xffffffff
117 mww $SYSCTL_SRCR2 0xffffffff
122 # Clear any pending SysCtl interrupts
123 mww $SYSCTL_MISC 0xffffffff
125 # Wait for any pending flash operations to complete
126 while {[expr {[mrw $FLASH_FMC] & 0xffff}] != 0} { sleep 1 }
127 while {[expr {[mrw $FLASH_FMC2] & 0xffff}] != 0} { sleep 1 }
129 # Reset the flash controller registers
132 mww $FLASH_FCMISC 0xffffffff
136 $_TARGETNAME configure -event reset-start {
140 # When nRST is asserted on most Stellaris devices, it clears some of
141 # the debug state. The ARMv7M and Cortex-M3 TRMs say that's wrong;
142 # and OpenOCD depends on those TRMs. So we won't use SRST on those
143 # chips. (Only power-on reset should affect debug state, beyond a
144 # few specified bits; not the chip's nRST input, wired to SRST.)
146 # REVISIT current errata specs don't seem to cover this issue.
147 # Do we have more details than this email?
148 # https://lists.berlios.de/pipermail
149 # /openocd-development/2008-August/003065.html
154 if {$_DEVICECLASS != 0xff} {
155 set device_class $_DEVICECLASS
157 set device_class [expr {([mrw 0x400fe000] >> 16) & 0xff}]
160 if {$device_class == 0 || $device_class == 1 ||
161 $device_class == 3 || $device_class == 5 || $device_class == 0xa} {
163 # Sandstorm, Fury, DustDevil, Blizzard and Snowflake are able to use NVIC SYSRESETREQ
164 cortex_m reset_config sysresetreq
168 # Tempest and Firestorm default to using NVIC VECTRESET
169 # peripherals will need resetting manually, see proc reset_peripherals
170 cortex_m reset_config vectreset
172 # reset peripherals, based on code in
173 # http://www.ti.com/lit/er/spmz573a/spmz573a.pdf
174 reset_peripherals $device_class
178 # flash configuration ... autodetects sizes, autoprobed
179 flash bank $_CHIPNAME.flash stellaris 0 0 0 0 $_TARGETNAME