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https://github.com/brain-hackers/u-boot-brain
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3e3262bd14
Existing boards by default have an issue where the LBC SDRAM SPD EEPROM and the DDR2 SDRAM SPD EEPROM both land at 0x51. After the hardware modification listed in the README is made, then the DDR2 SPD EEPROM appears at 0x53. So this implements a board specific get_spd() by taking advantage of the existing weak linkage, that 1st tries reading at 0x53 and then if that fails, it falls back to the old 0x51. Since the old dependency issue of "SPD implies no LBC SDRAM" gets removed with the hardware errata fix, remove that restriction in the code, so both LBC SDRAM and SPD can be selected. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
134 lines
3.4 KiB
C
134 lines
3.4 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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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 = 10;
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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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#ifdef CONFIG_SPD_EEPROM
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/*
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* Workaround for hardware errata. An i2c address conflict
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* existed on earlier boards; the workaround moved the DDR
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* SPD from 0x51 to 0x53. So we try and read 0x53 1st, and
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* if that fails, then fall back to reading at 0x51.
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*/
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void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
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{
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int ret;
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#ifdef ALT_SPD_EEPROM_ADDRESS
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if (i2c_address == SPD_EEPROM_ADDRESS) {
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ret = i2c_read(ALT_SPD_EEPROM_ADDRESS, 0, 1, (uchar *)spd,
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sizeof(generic_spd_eeprom_t));
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if (ret == 0)
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return; /* Good data at 0x53 */
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memset(spd, 0, sizeof(generic_spd_eeprom_t));
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}
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#endif
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ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
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sizeof(generic_spd_eeprom_t));
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if (ret) {
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printf("DDR: failed to read SPD from addr %u\n", i2c_address);
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memset(spd, 0, sizeof(generic_spd_eeprom_t));
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}
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}
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#else
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/*
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* fixed_sdram init -- doesn't use serial presence detect.
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* Assumes 256MB DDR2 SDRAM SODIMM, without ECC, running at DDR400 speed.
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*/
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phys_size_t fixed_sdram(void)
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{
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volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_MPC85xx_DDR_ADDR);
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out_be32(&ddr->cs0_bnds, 0x0000007f);
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out_be32(&ddr->cs1_bnds, 0x008000ff);
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out_be32(&ddr->cs2_bnds, 0x00000000);
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out_be32(&ddr->cs3_bnds, 0x00000000);
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out_be32(&ddr->cs0_config, 0x80010101);
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out_be32(&ddr->cs1_config, 0x80010101);
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out_be32(&ddr->cs2_config, 0x00000000);
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out_be32(&ddr->cs3_config, 0x00000000);
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out_be32(&ddr->timing_cfg_3, 0x00000000);
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out_be32(&ddr->timing_cfg_0, 0x00220802);
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out_be32(&ddr->timing_cfg_1, 0x38377322);
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out_be32(&ddr->timing_cfg_2, 0x0fa044C7);
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out_be32(&ddr->sdram_cfg, 0x4300C000);
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out_be32(&ddr->sdram_cfg_2, 0x24401000);
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out_be32(&ddr->sdram_mode, 0x23C00542);
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out_be32(&ddr->sdram_mode_2, 0x00000000);
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out_be32(&ddr->sdram_interval, 0x05080100);
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out_be32(&ddr->sdram_md_cntl, 0x00000000);
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out_be32(&ddr->sdram_data_init, 0x00000000);
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out_be32(&ddr->sdram_clk_cntl, 0x03800000);
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asm("sync;isync;msync");
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udelay(500);
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#ifdef CONFIG_DDR_ECC
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/* Enable ECC checking */
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out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL | 0x20000000);
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#else
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out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL);
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#endif
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return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
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}
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#endif
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