--- /dev/null
+#################################################################################################
+# #
+# Author: Lars Poeschel (larsi@wh2.tu-dresden.de) #
+# Generated for In-Circuit ICnova SAM9G45 SODIMM #
+# http://www.ic-board.de/product_info.php?info=p214_ICnova-SAM9G45-SODIMM.html|ICnova #
+# #
+#################################################################################################
+
+# FIXME use some standard target config, maybe create one from this
+#
+# source [find target/...cfg]
+
+source [find target/at91sam9g45.cfg]
+
+# Set reset type.
+# reset_config trst_and_srst
+
+# adapter_nsrst_delay 200
+# jtag_ntrst_delay 200
+
+
+# If you don't want to execute built-in boot rom code (and there are good reasons at times not to do that) in the
+# AT91SAM9 family, the microcontroller is a lump on a log without initialization. Because this family has
+# some powerful features, we want to have a special function that handles "reset init". To do this we declare
+# an event handler where these special activities can take place.
+
+scan_chain
+$_TARGETNAME configure -event reset-init {at91sam9g45_init}
+
+# Set fallback clock to 1/6 of worst-case clock speed (which would be the 32.768 kHz slow clock).
+# Slow-speed oscillator enabled at reset, so run jtag speed slow.
+$_TARGETNAME configure -event reset-start {at91sam9g45_start}
+
+
+# NandFlash configuration and definition
+# Future TBD
+# Flash configuration
+# flash bank cfi <base> <size> <chip width> <bus width> <target#>
+set _FLASHNAME $_CHIPNAME.flash
+# set _NANDNAME $_CHIPNAME.nand
+flash bank $_FLASHNAME cfi 0x10000000 0x00800000 2 2 $_TARGETNAME
+# nand device $_NANDNAME at91sam9 $_TARGETNAME 0x40000000 0xFFFFE800
+
+
+proc read_register {register} {
+ set result ""
+ mem2array result 32 $register 1
+ return $result(0)
+}
+
+proc at91sam9g45_start { } {
+
+ # Make sure that the the jtag is running slow, since there are a number of different ways the board
+ # can be configured coming into this state that can cause communication problems with the jtag
+ # adapter. Also since this call can be made following a "reset init" where fast memory accesses
+ # are enabled, need to temporarily shut this down so that the RSTC_MR register can be written at slower
+ # jtag speed without causing GDB keep alive problem.
+
+ arm7_9 fast_memory_access disable
+ # Slow-speed oscillator enabled at reset, so run jtag speed slow.
+ adapter_khz 4
+ # Make sure processor is halted, or error will result in following steps.
+ halt
+ wait_halt 10000
+ # RSTC_MR : enable user reset.
+ mww 0xfffffd08 0xa5000501
+}
+
+
+proc at91sam9g45_init { } {
+
+ # At reset AT91SAM9G45 chip runs on slow clock (32.768 kHz). To shift over to a normal clock requires
+ # a number of steps that must be carefully performed. The process outline below follows the
+ # recommended procedure outlined in the AT91SAM9G45 technical manual.
+ #
+ # Several key and very important things to keep in mind:
+ # The SDRAM parts used currently on the board are -75 grade parts. This
+ # means the master clock (MCLK) must be at or below 133 MHz or timing errors will occur. The processor
+ # core can operate up to 400 MHz and therefore PCLK must be at or below this to function properly.
+
+ # Make sure processor is halted, or error will result in following steps.
+ halt
+ # RSTC_MR : enable user reset.
+ mww 0xfffffd08 0xa5000501
+ # WDT_MR : disable watchdog.
+ mww 0xfffffd44 0x00008000
+
+ # Enable the main 15.000 MHz oscillator in CKGR_MOR register.
+ # Wait for MOSCS in PMC_SR to assert indicating oscillator is again stable after change to CKGR_MOR.
+
+ mww 0xfffffc20 0x00004001
+ while { [expr [read_register 0xfffffc68] & 0x01] != 1 } { sleep 1 }
+
+ # Set PLLA Register for 792.576 MHz (divider: bypass, multiplier: 43).
+ # Wait for LOCKA signal in PMC_SR to assert indicating PLLA is stable.
+
+ #mww 0xfffffc28 0x202a3f01
+ mww 0xfffffc28 0x20c73f03
+ while { [expr [read_register 0xfffffc68] & 0x02] != 2 } { sleep 1 }
+
+ # Set master system clock prescaler divide by 6 and processor clock divide by 2 in PMC_MCKR.
+ # Wait for MCKRDY signal from PMC_SR to assert.
+
+ #mww 0xfffffc30 0x00000101
+ mww 0xfffffc30 0x00001301
+ while { [expr [read_register 0xfffffc68] & 0x08] != 8 } { sleep 1 }
+
+ # Now change PMC_MCKR register to select PLLA.
+ # Wait for MCKRDY signal from PMC_SR to assert.
+
+ mww 0xfffffc30 0x00001302
+ while { [expr [read_register 0xfffffc68] & 0x08] != 8 } { sleep 1 }
+
+ # Processor and master clocks are now operating and stable at maximum frequency possible:
+ # -> MCLK = 132.096 MHz
+ # -> PCLK = 396.288 MHz
+
+ # Switch over to adaptive clocking.
+
+ adapter_khz 6000
+
+ # Enable faster DCC downloads.
+
+ arm7_9 dcc_downloads enable
+
+ # To be able to use external SDRAM, several peripheral configuration registers must
+ # be modified. The first change is made to PIO_ASR to select peripheral functions
+ # for D15 through D31. The second change is made to the PIO_PDR register to disable
+ # this for D15 through D31.
+
+# mww 0xfffff870 0xffff0000
+# mww 0xfffff804 0xffff0000
+
+ # The EBI chip select register EBI_CS must be specifically configured to enable the internal SDRAM controller
+ # using CS1. Additionally we want CS3 assigned to NandFlash. Also VDDIO is connected physically on
+ # the board to the 3.3 VDC power supply so set the appropriate register bit to notify the micrcontroller.
+
+ # mww 0xffffef1c 0x000100a
+
+ # The ICnova SAM9G45 SODIMM has built-in NandFlash. The exact physical timing characteristics
+ # for the memory type used on the current board (MT29F2G08AACWP) can be established by setting
+ # four registers in order: SMC_SETUP3, SMC_PULSE3, SMC_CYCLE3, and SMC_MODE3.
+
+ # mww 0xffffec30 0x00020002
+ # mww 0xffffec34 0x04040404
+ # mww 0xffffec38 0x00070007
+ # mww 0xffffec3c 0x00030003
+
+ # Identify NandFlash bank 0. Disabled at the moment because a memory driver is not yet complete.
+
+# nand probe 0
+
+ # SMC_SETUP0 : Setup SMC for NOR Flash
+ mww 0xffffe800 0x0012000a
+ # SMC_PULSE0
+ mww 0xffffe804 0x3b38343b
+ # SMC_CYCLE0
+ mww 0xffffe808 0x003f003f
+ # SMC_MODE0
+ mww 0xffffe80c 0x00001000
+ # Identify flash bank 0
+ flash probe 0
+
+ # Now setup SDRAM. This is tricky and configuration is very important for reliability! The current calculations
+ # are based on 2 x Samsung K4T51083QG memory.
+
+ # 0. Enable DDR2 Clock
+ mww 0xfffffc00 0x4
+ # 1. Program memory device type
+ # 1.1 configure the DDR controller
+ mww 0xffffe620 0x16
+ # 1.2 program the DDR controller
+ mww 0xffffe608 0x3d
+
+ # 2. program memory device features
+ # 2.1 assume timings for 7.5ns min clock period
+ mww 0xffffe60c 0x21128226
+ # 2.2 pSDDRC->HDDRSDRC2_T1PR
+ mww 0xffffe610 0x02c8100e
+ # 2.3 pSDDRC->HDDRSDRC2_T2PR
+ mww 0xffffe614 0x01000702
+ # 3. NOP
+ mww 0xffffe600 0x1
+ mww 0x70000000 0x1
+ # 3.1 delay 200us
+ sleep 1
+ # jim tcl alternative: after ms
+ # after 0.2
+
+ # 4. NOP
+ mww 0xffffe600 0x1
+ mww 0x70000000 0x1
+ # 4.1 delay 400ns
+
+ # 5. set all bank precharge
+ mww 0xffffe600 0x2
+ mww 0x70000000 0x1
+ # 5.1 delay 400ns
+
+ # 6. set EMR operation (EMRS2)
+ mww 0xffffe600 0x5
+ mww 0x74000000 0x1
+ # 6.1 delay 2 cycles
+
+ # 7. set EMR operation (EMRS3)
+ mww 0xffffe600 0x5
+ mww 0x76000000 0x1
+ # 7.1 delay 2 cycles
+
+ # 8. set EMR operation (EMRS1)
+ mww 0xffffe600 0x5
+ mww 0x72000000 0x1
+ # 8.1 delay 200 cycles (400Mhz -> 5 * 10^-7s)
+ sleep 1
+
+ # 9. Enable DLL Reset (set DLL bit)
+ set CR [expr [read_register 0xffffe608] | 0x80]
+ mww 0xffffe608 $CR
+
+ # 10. mode register cycle to reset the DLL
+ mww 0xffffe600 0x5
+ mww 0x70000000 0x1
+ # 10.1 delay 2 cycles
+
+ # 11. set all bank precharge
+ mww 0xffffe600 0x2
+ mww 0x70000000 0x1
+ # 11.1 delay 400 ns
+
+ # 12. two auto-refresh (CBR) cycles are provided.
+ mww 0xffffe600 0x4
+ mww 0x70000000 0x1
+ # 12.1 delay 10 cycles
+ # 12.2 2nd cycle (schreiben des Mode Register sparen wir uns)
+ mww 0x70000000 0x1
+ # 12.3 delay 10 cycles
+
+ # 13. disable DLL reset (clear DLL bit)
+ set CR [expr [read_register 0xffffe608] & 0xffffff7f]
+ mww 0xffffe608 $CR
+
+ # 14. mode register set cycle
+ mww 0xffffe600 0x3
+ mww 0x70000000 0x1
+
+ # 15. program OCD field (set OCD bits)
+ set CR [expr [read_register 0xffffe608] | 0x7000]
+ mww 0xffffe608 $CR
+
+ # 16. (EMRS1)
+ mww 0xffffe600 0x5
+ mww 0x72000000 0x1
+ # 16.1 delay 2 cycles
+
+ # 17. disable OCD field (clear OCD bits)
+ set CR [expr [read_register 0xffffe608] & 0xffff8fff]
+ mww 0xffffe608 $CR
+
+ # 18. (EMRS1)
+ mww 0xffffe600 0x5
+ mww 0x76000000 0x1
+ # 18.1 delay 2 cycles
+
+ # 19. normal mode command
+ mww 0xffffe600 0x0
+ mww 0x70000000 0x1
+
+ # 20. perform write to any address
+ #mww 0x70000000 0x1
+
+ # 21. write refresh rate into the count field of the refresh rate register
+ mww 0xffffe604 0x24b
+ # 21.1 delay (500 * 6 cycles)
+
+ arm7_9 fast_memory_access enable
+}
+
+
projects / openocd / commitdiff