# SPDX-License-Identifier: GPL-2.0-or-later # # Glyn Tonga2 SO-DIMM CPU module (Toshiba TMPA900CMXBG, ARM9) # # http://toshiba-mikrocontroller.de/sites/TMPA900CPUBOARDStarter.htm # # Hardware on the S0-DIMM module: # - Toshiba TMPA900CMXBG (ARM9, ARM926EJ-S, max. 200MHz) # - DDR SDRAM: Hynix H5MS5162DFR-J3M (64Mbyte, x16, 1.8V, 166/83MHz at CL3/2) # - NAND flash: Samsung K9F2G08U0B-PIB0 (256M x 8 Bit, 3.3V) # - Ethernet: SMSC LAN9221I-ABZJ (10/100Mbit, Non-PCI, 16 bit interface) # source [find target/tmpa900.cfg] ######################## # Target configuration # ######################## # Initial JTAG speed should not exceed 1/6 of the initial CPU clock # frequency (24MHz). Be conservative and use 1/8 of the frequency. # (24MHz / 8 = 3MHz) adapter speed 3000 $_TARGETNAME configure -event reset-start { # Upon reset, set the JTAG frequency to 3MHz again, see above. echo "Setting JTAG speed to 3MHz until clocks are initialized." adapter speed 3000 # Halt the CPU. halt # Disable faster memory access for now. arm7_9 fast_memory_access disable } $_TARGETNAME configure -event reset-init { # Setup clocks, and initialize SRAM and DDR SDRAM. tonga2_init # At this point the CPU is running at 192MHz, increase JTAG speed. # Tests showed that 15MHz works OK, higher speeds can cause problems, # though. Not sure if this is a CPU issue or JTAG adapter issue. echo "Increasing JTAG speed to 15MHz." adapter speed 15000 # Enable faster memory access. arm7_9 fast_memory_access enable } proc tonga2_init { } { ###################### # PLL initialization # ###################### # Clock overview (see datasheet chapter 3.5.2, page 57): # - fs: Low-frequency oscillator # - fOSCH: High-frequency oscillator (24MHz on this board) # - fPLL = fOSCH * multiplier (where multiplier can be 6 or 8) # - fFCLK = fPLL / gear (where gear can be 1/2/4/8) # - fHCLK is always fFCLK/2. fPCLK is also fFCLK/2. # # We select multiplier = 8 and gear = 1, so # fFCLK = fOSCH * 8 / 1 = 192MHz. # SYSCR3 (System Control Register 3): Disable and configure PLL. # - PLL operation control: off # - PLL constant value setting 1: always 0, as per datasheet # - PLL constant value setting 2: x8 (multiplier = 8) mww 0xf005000c 0x00000007 # SYSCR4 (System Control Register 4): Configure PLL. # - PLL constant value setting 3: 140MHz or more # - PLL constant value setting 4: always 1, as per datasheet # - PLL constant value setting 5: 140MHz or more mww 0xf0050010 0x00000065 # SYSCR3 (System Control Register 3): Enable PLL. # - PLL operation control: on # - All other bits remain set as above. mww 0xf005000c 0x00000087 # Wait for PLL to stabilize. sleep 10 # SYSCR2 (System Control Register 2): Switch from fOSCH to fPLL. # - Selection of the PLL output clock: fPLL mww 0xf0050008 0x00000002 # SYSCR1 (System Control Register 1): # - Clock gear programming: fc/1 (i.e., gear = 1, don't divide). mww 0xf0050004 0x00000000 # CLKCR5 (Clock Control Register 5): Set bits 3 and 6. The datasheet # says the bits are reserved, but also recommends "Write as one". mww 0xf0050054 0x00000048 ############################################################## # Dynamic Memory Controller (DMC) / DDR SDRAM initialization # ############################################################## # PMC (Power Management Controller): # PMCDRV (External Port "Driverbility" control register): # Bits DRV_MEM0/DRV_MEM1 (memory relation port drive power): mww 0xf0020260 0x00000003 ;# Select 1.8V +/- 0.1V # Setup DDR SDRAM timing parameters for our specific chip. mww 0xf4310014 0x00000004 ;# cas_latency = 2 mww 0xf4310018 0x00000001 ;# t_dqss = 1 mww 0xf431001c 0x00000002 ;# t_mrd = 2 mww 0xf4310020 0x0000000a ;# t_ras = 10 mww 0xf4310024 0x0000000a ;# t_rc = 10 mww 0xf4310028 0x00000013 ;# t_rcd = 3, schedule_rcd = 2 mww 0xf431002c 0x0000010a ;# t_rfc = 10, schedule_rfc = 8 mww 0xf4310030 0x00000013 ;# t_rp = 3, schedule_rp = 2 mww 0xf4310034 0x00000002 ;# t_rrd = 2 mww 0xf4310038 0x00000002 ;# t_wr = 2 mww 0xf431003c 0x00000001 ;# t_wtr = 1 mww 0xf4310040 0x0000000a ;# t_xp = 10 mww 0xf4310044 0x0000000c ;# t_xsr = 12 mww 0xf4310048 0x00000014 ;# t_esr = 20 # dmc_memory_cfg_5 (DMC Memory Configuration register): # Set memory configuration: # column_bits = 10, row_bits = 13, ap-bit = 10, power_down_prd = 0, # auto_power_down = disable, stop_mem_clock = disable, memory_burst = 4 mww 0xf431000c 0x00010012 # dmc_user_config_5 (DMC user_config register): # Data bus width of DDR SDRAM: 16 bit mww 0xf4310304 0x00000058 # dmc_refresh_prd_5 (DMC Refresh Period register): # Auto refresh: every 2656 (0xa60) DMCSCLK periods. mww 0xf4310010 0x00000a60 # dmc_chip_0_cfg_5 (DMC chip_0_cfg registers): # - SDRAM address structure: bank, row, column # - address_match = 01000000 (start address [31:24]) # - address_mask = 11111100 (start address [31:24] mask value) mww 0xf4310200 0x000140fc # Initialize the DDR SDRAM chip. # dmc_direct_cmd_5 (DMC Direct Command register). # See datasheet chapter 3.10.5.1, page 268. mww 0xf4310008 0x000c0000 ;# RAM init: NOP mww 0xf4310008 0x00000000 ;# RAM init: Precharge all mww 0xf4310008 0x00040000 ;# RAM init: Autorefresh mww 0xf4310008 0x00040000 ;# RAM init: Autorefresh mww 0xf4310008 0x00080032 ;# RAM init: addr_13_to_0 = 0x32 mww 0xf4310008 0x000c0000 ;# RAM init: NOP mww 0xf4310008 0x000a0000 ;# RAM init: bank_addr = bank 2 # dmc_id_<0-5>_cfg_5 (DMC id_<0-5>_cfg registers): # Set min./max. QoS values. # - 0x5: Enable QoS, max. QoS = 1 # - 0xb: Enable QoS, min. QoS = 2 mww 0xf4310100 0x00000005 ;# AHB0: CPU Data mww 0xf4310104 0x00000005 ;# AHB1: CPU Inst mww 0xf4310108 0x0000000b ;# AHB2: LCDC mww 0xf431010c 0x00000005 ;# AHB3: LCDDA, USB mww 0xf4310110 0x00000005 ;# AHB4: DMA1 mww 0xf4310114 0x00000005 ;# AHB5: DMA2 # dmc_memc_cmd_5 (DMC Memory Controller Command register): # Change DMC state to ready. mww 0xf4310004 0x00000000 ;# memc_cmd = "Go" # EBI: SMC Timeout register mww 0xf00a0050 0x00000001 ;# smc_timeout = 1 ######################################################## # Static Memory Controller (SMC) / SRAM initialization # ######################################################## # smc_set_cycles_5 (SMC Set Cycles register): # tRC = 10, tWC = 10, tCEOE = 7, tWP = 5, tPC=2, tTR=2 mww 0xf4311014 0x0004afaa # smc_set_opmode_5 (SMC Set Opmode register): # Memory data bus width = 16 bits, async read mode, read burst # length = 1 beat, async write mode, write burst length = 1 beat, # byte enable (SMCBE0-1) timing = SMCCSn timing, memory burst boundary # split setting = burst can cross any address boundary mww 0xf4311018 0x00000001 # smc_direct_cmd_5 (SMC Direct Command register): # cmd_type = UpdateRegs, chip_select = CS1 mww 0xf4311010 0x00c00000 echo "Clocks, SRAM, and DDR SDRAM are now initialized." } ####################### # Flash configuration # ####################### # TODO: Implement NAND support.