From 9490a7f1a9484617bad75c60807ce02c8a3a6d56 Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Fri, 25 Jul 2008 13:31:05 -0500 Subject: mpc85xx: Add support for the MPC8536DS reference board Signed-off-by: Kumar Gala Signed-off-by: Srikanth Srinivasan Signed-off-by: Dejan Minic Signed-off-by: Jason Jin Signed-off-by: Dave Liu Signed-off-by: Kumar Gala --- board/freescale/mpc8536ds/ddr.c | 79 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 board/freescale/mpc8536ds/ddr.c (limited to 'board/freescale/mpc8536ds/ddr.c') diff --git a/board/freescale/mpc8536ds/ddr.c b/board/freescale/mpc8536ds/ddr.c new file mode 100644 index 0000000000..2e88c79331 --- /dev/null +++ b/board/freescale/mpc8536ds/ddr.c @@ -0,0 +1,79 @@ +/* + * Copyright 2008 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * Version 2 as published by the Free Software Foundation. + */ + +#include +#include + +#include + +static void get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address) +{ + i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t)); +} + +unsigned int fsl_ddr_get_mem_data_rate(void) +{ + return get_ddr_freq(0); +} + +void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, + unsigned int ctrl_num) +{ + unsigned int i; + + if (ctrl_num) { + printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num); + return; + } + + for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { + get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS); + } +} + +void fsl_ddr_board_options(memctl_options_t *popts, unsigned int ctrl_num) +{ + /* + * Factors to consider for clock adjust: + * - number of chips on bus + * - position of slot + * - DDR1 vs. DDR2? + * - ??? + * + * This needs to be determined on a board-by-board basis. + * 0110 3/4 cycle late + * 0111 7/8 cycle late + */ + popts->clk_adjust = 7; + + /* + * Factors to consider for CPO: + * - frequency + * - ddr1 vs. ddr2 + */ + popts->cpo_override = 10; + + /* + * Factors to consider for write data delay: + * - number of DIMMs + * + * 1 = 1/4 clock delay + * 2 = 1/2 clock delay + * 3 = 3/4 clock delay + * 4 = 1 clock delay + * 5 = 5/4 clock delay + * 6 = 3/2 clock delay + */ + popts->write_data_delay = 3; + + /* + * Factors to consider for half-strength driver enable: + * - number of DIMMs installed + */ + popts->half_strength_driver_enable = 0; +} -- cgit