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https://github.com/AsahiLinux/u-boot
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91 lines
2 KiB
C
91 lines
2 KiB
C
/*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <i2c.h>
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#include <asm/fsl_ddr_sdram.h>
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#include <asm/fsl_ddr_dimm_params.h>
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static void
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get_spd(ddr2_spd_eeprom_t *spd, unsigned char i2c_address)
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{
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i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr2_spd_eeprom_t));
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/* We use soldered memory, but use an SPD EEPROM to describe it.
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* The SPD has an unspecified dimm type, but the DDR2 initialization
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* code requires a specific type to be specified. This sets the type
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* as a standard unregistered SO-DIMM. */
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if (spd->dimm_type == 0) {
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spd->dimm_type = 0x4;
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((uchar *)spd)[63] += 0x4;
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}
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}
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unsigned int fsl_ddr_get_mem_data_rate(void)
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{
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return get_ddr_freq(0);
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}
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void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd,
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unsigned int ctrl_num)
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{
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unsigned int i;
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if (ctrl_num) {
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printf("%s: invalid ctrl_num = %d\n", __func__, ctrl_num);
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return;
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}
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for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++)
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get_spd(&(ctrl_dimms_spd[i]), SPD_EEPROM_ADDRESS);
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}
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void fsl_ddr_board_options(memctl_options_t *popts,
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dimm_params_t *pdimm,
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unsigned int ctrl_num)
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{
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/*
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* Factors to consider for clock adjust:
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* - number of chips on bus
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* - position of slot
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* - DDR1 vs. DDR2?
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* - ???
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*
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* This needs to be determined on a board-by-board basis.
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* 0110 3/4 cycle late
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* 0111 7/8 cycle late
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*/
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popts->clk_adjust = 7;
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/*
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* Factors to consider for CPO:
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* - frequency
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* - ddr1 vs. ddr2
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*/
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popts->cpo_override = 9;
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/*
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* Factors to consider for write data delay:
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* - number of DIMMs
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*
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* 1 = 1/4 clock delay
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* 2 = 1/2 clock delay
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* 3 = 3/4 clock delay
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* 4 = 1 clock delay
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* 5 = 5/4 clock delay
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* 6 = 3/2 clock delay
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*/
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popts->write_data_delay = 3;
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/*
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* Factors to consider for half-strength driver enable:
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* - number of DIMMs installed
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*/
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popts->half_strength_driver_enable = 0;
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}
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