MPC83xx RAM controller
This driver supplies support for the embedded RAM controller on MCP83xx-series
SoCs.
For static configuration mode, each controller node should have child nodes
describing the actual RAM modules installed.
Controller node
===============
Required properties:
- compatible: Must be "fsl,mpc83xx-mem-controller"
- reg: The address of the RAM controller's register space
- #address-cells: Must be 2
- #size-cells: Must be 1
- driver_software_override: DDR driver software override is enabled (1) or
disabled (0)
- p_impedance_override: DDR driver software p-impedance override; possible
values:
* DSO_P_IMPEDANCE_HIGHEST_Z
* DSO_P_IMPEDANCE_MUCH_HIGHER_Z
* DSO_P_IMPEDANCE_HIGHER_Z
* DSO_P_IMPEDANCE_NOMINAL
* DSO_P_IMPEDANCE_LOWER_Z
- n_impedance_override: DDR driver software n-impedance override; possible
values:
* DSO_N_IMPEDANCE_HIGHEST_Z
* DSO_N_IMPEDANCE_MUCH_HIGHER_Z
* DSO_N_IMPEDANCE_HIGHER_Z
* DSO_N_IMPEDANCE_NOMINAL
* DSO_N_IMPEDANCE_LOWER_Z
- odt_termination_value: ODT termination value for I/Os; possible values:
* ODT_TERMINATION_75_OHM
* ODT_TERMINATION_150_OHM
- ddr_type: Selects voltage level for DDR pads; possible
values:
* DDR_TYPE_DDR2_1_8_VOLT
* DDR_TYPE_DDR1_2_5_VOLT
- mvref_sel: Determine where MVREF_SEL signal is generated;
possible values:
* MVREF_SEL_EXTERNAL
* MVREF_SEL_INTERNAL_GVDD
- m_odr: Disable memory transaction reordering; possible
values:
* M_ODR_ENABLE
* M_ODR_DISABLE
- clock_adjust: Clock adjust; possible values:
* CLOCK_ADJUST_025
* CLOCK_ADJUST_05
* CLOCK_ADJUST_075
* CLOCK_ADJUST_1
- ext_refresh_rec: Extended refresh recovery time; possible values:
0, 16, 32, 48, 64, 80, 96, 112
- read_to_write: Read-to-write turnaround; possible values:
0, 1, 2, 3
- write_to_read: Write-to-read turnaround; possible values:
0, 1, 2, 3
- read_to_read: Read-to-read turnaround; possible values:
0, 1, 2, 3
- write_to_write: Write-to-write turnaround; possible values:
0, 1, 2, 3
- active_powerdown_exit: Active powerdown exit timing; possible values:
1, 2, 3, 4, 5, 6, 7
- precharge_powerdown_exit: Precharge powerdown exit timing; possible values:
1, 2, 3, 4, 5, 6, 7
- odt_powerdown_exit: ODT powerdown exit timing; possible values:
0, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15
- mode_reg_set_cycle: Mode register set cycle time; possible values:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
- precharge_to_activate: Precharge-to-acitvate interval; possible values:
1, 2, 3, 4, 5, 6, 7
- activate_to_precharge: Activate to precharge interval; possible values:
4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19
- activate_to_readwrite: Activate to read/write interval for SDRAM;
possible values:
1, 2, 3, 4, 5, 6, 7
- mcas_latency: MCAS latency from READ command; possible values:
* CASLAT_20
* CASLAT_25
* CASLAT_30
* CASLAT_35
* CASLAT_40
* CASLAT_45
* CASLAT_50
* CASLAT_55
* CASLAT_60
* CASLAT_65
* CASLAT_70
* CASLAT_75
* CASLAT_80
- refresh_recovery: Refresh recovery time; possible values:
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23
- last_data_to_precharge: Last data to precharge minimum interval; possible
values:
1, 2, 3, 4, 5, 6, 7
- activate_to_activate: Activate-to-activate interval; possible values:
1, 2, 3, 4, 5, 6, 7
- last_write_data_to_read: Last write data pair to read command issue
interval; possible values:
1, 2, 3, 4, 5, 6, 7
- additive_latency: Additive latency; possible values:
0, 1, 2, 3, 4, 5
- mcas_to_preamble_override: MCAS-to-preamble-override; possible values:
* READ_LAT
* READ_LAT_PLUS_1_4
* READ_LAT_PLUS_1_2
* READ_LAT_PLUS_3_4
* READ_LAT_PLUS_1
* READ_LAT_PLUS_5_4
* READ_LAT_PLUS_3_2
* READ_LAT_PLUS_7_4
* READ_LAT_PLUS_2
* READ_LAT_PLUS_9_4
* READ_LAT_PLUS_5_2
* READ_LAT_PLUS_11_4
* READ_LAT_PLUS_3
* READ_LAT_PLUS_13_4
* READ_LAT_PLUS_7_2
* READ_LAT_PLUS_15_4
* READ_LAT_PLUS_4
* READ_LAT_PLUS_17_4
* READ_LAT_PLUS_9_2
* READ_LAT_PLUS_19_4
- write_latency: Write latency; possible values:
1, 2, 3, 4, 5, 6, 7
- read_to_precharge: Read to precharge; possible values:
1, 2, 3, 4
- write_cmd_to_write_data: Write command to write data strobe timing
adjustment; possible values:
* CLOCK_DELAY_0
* CLOCK_DELAY_1_4
* CLOCK_DELAY_1_2
* CLOCK_DELAY_3_4
* CLOCK_DELAY_1
* CLOCK_DELAY_5_4
* CLOCK_DELAY_3_2
- minimum_cke_pulse_width: Minimum CKE pulse width; possible values:
1, 2, 3, 4
- four_activates_window: Window for four activates; possible values:
1, 2, 3, 4 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19
- self_refresh: Self refresh (during sleep); possible values:
* SREN_DISABLE
* SREN_ENABLE
- ecc: Support for ECC; possible values:
* ECC_DISABLE
* ECC_ENABLE
- registered_dram: Support for registered DRAM; possible values:
* RD_DISABLE
* RD_ENABLE
- sdram_type: Type of SDRAM device to be used; possible values:
* TYPE_DDR1
* TYPE_DDR2
- dynamic_power_management: Dynamic power management mode; possible values:
* DYN_PWR_DISABLE
* DYN_PWR_ENABLE
- databus_width: DRAM data bus width; possible values
* DATA_BUS_WIDTH_16
* DATA_BUS_WIDTH_32
- nc_auto_precharge: Non-concurrent auto-precharge; possible values:
* NCAP_DISABLE
* NCAP_ENABLE
- timing_2t: 2T timing; possible values:
* TIMING_1T
* TIMING_2T
- bank_interleaving_ctrl: Bank (chip select) interleaving control; possible
values:
* INTERLEAVE_NONE
* INTERLEAVE_1_AND_2
- precharge_bit_8: Precharge bin 8; possible values
* PRECHARGE_MA_10
* PRECHARGE_MA_8
- half_strength: Global half-strength override; possible values:
* STRENGTH_FULL
* STRENGTH_HALF
- bypass_initialization: Bypass initialization; possible values:
* INITIALIZATION_DONT_BYPASS
* INITIALIZATION_BYPASS
- force_self_refresh: Force self refresh; possible values:
* MODE_NORMAL
* MODE_REFRESH
- dll_reset: DLL reset; possible values:
* DLL_RESET_ENABLE
* DLL_RESET_DISABLE
- dqs_config: DQS configuration; possible values:
* DQS_TRUE
- odt_config: ODT configuration; possible values:
* ODT_ASSERT_NEVER
* ODT_ASSERT_WRITES
* ODT_ASSERT_READS
* ODT_ASSERT_ALWAYS
- posted_refreshes: Number of posted refreshes
1, 2, 3, 4, 5, 6, 7, 8
- sdmode: Initial value loaded into the DDR SDRAM mode
register
- esdmode: Initial value loaded into the DDR SDRAM extended
mode register
- esdmode2: Initial value loaded into the DDR SDRAM extended
mode 2 register
- esdmode3: Initial value loaded into the DDR SDRAM extended
mode 3 register
- refresh_interval: Refresh interval; possible values:
0 - 65535
- precharge_interval: Precharge interval; possible values:
0 - 16383
RAM module node:
================
Required properties:
- reg: A triple <cs addr size>, which consists of:
* cs - the chipselect used to drive this RAM module
* addr - the address where this RAM module's memory is map
to in the global memory space
* size - the size of the RAM module's memory in bytes
- auto_precharge: Chip select auto-precharge; possible values:
* AUTO_PRECHARGE_ENABLE
* AUTO_PRECHARGE_DISABLE
- odt_rd_cfg: ODT for reads configuration; possible values:
* ODT_RD_NEVER
* ODT_RD_ONLY_CURRENT
* ODT_RD_ONLY_OTHER_CS
* ODT_RD_ONLY_OTHER_DIMM
* ODT_RD_ALL
- odt_wr_cfg: ODT for writes configuration; possible values:
* ODT_WR_NEVER
* ODT_WR_ONLY_CURRENT
* ODT_WR_ONLY_OTHER_CS
* ODT_WR_ONLY_OTHER_DIMM
* ODT_WR_ALL
- bank_bits: Number of bank bits for SDRAM on chip select; possible
values:
2, 3
- row_bits: Number of row bits for SDRAM on chip select; possible values:
12, 13, 14
- col_bits: Number of column bits for SDRAM on chip select; possible
values:
8, 9, 10, 11
Example:
memory@2000 {
#address-cells = <2>;
#size-cells = <1>;
compatible = "fsl,mpc83xx-mem-controller";
reg = <0x2000 0x1000>;
device_type = "memory";
bootph-all;
driver_software_override = <DSO_ENABLE>;
p_impedance_override = <DSO_P_IMPEDANCE_NOMINAL>;
n_impedance_override = <DSO_N_IMPEDANCE_NOMINAL>;
odt_termination_value = <ODT_TERMINATION_150_OHM>;
ddr_type = <DDR_TYPE_DDR2_1_8_VOLT>;
clock_adjust = <CLOCK_ADJUST_05>;
read_to_write = <0>;
write_to_read = <0>;
read_to_read = <0>;
write_to_write = <0>;
active_powerdown_exit = <2>;
precharge_powerdown_exit = <6>;
odt_powerdown_exit = <8>;
mode_reg_set_cycle = <2>;
precharge_to_activate = <2>;
activate_to_precharge = <6>;
activate_to_readwrite = <2>;
mcas_latency = <CASLAT_40>;
refresh_recovery = <17>;
last_data_to_precharge = <2>;
activate_to_activate = <2>;
last_write_data_to_read = <2>;
additive_latency = <0>;
mcas_to_preamble_override = <READ_LAT_PLUS_1_2>;
write_latency = <3>;
read_to_precharge = <2>;
write_cmd_to_write_data = <CLOCK_DELAY_1_2>;
minimum_cke_pulse_width = <3>;
four_activates_window = <5>;
self_refresh = <SREN_ENABLE>;
sdram_type = <TYPE_DDR2>;
databus_width = <DATA_BUS_WIDTH_32>;
force_self_refresh = <MODE_NORMAL>;
dll_reset = <DLL_RESET_ENABLE>;
dqs_config = <DQS_TRUE>;
odt_config = <ODT_ASSERT_READS>;
posted_refreshes = <1>;
refresh_interval = <2084>;
precharge_interval = <256>;
sdmode = <0x0242>;
esdmode = <0x0440>;
ram@0 {
reg = <0x0 0x0 0x8000000>;
compatible = "nanya,nt5tu64m16hg";
odt_rd_cfg = <ODT_RD_NEVER>;
odt_wr_cfg = <ODT_WR_ONLY_CURRENT>;
bank_bits = <3>;
row_bits = <13>;
col_bits = <10>;
};
};