ddr.c
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/*
* Copyright 2008 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <i2c.h>
#include <fsl_ddr_sdram.h>
#include <fsl_ddr_dimm_params.h>
void fsl_ddr_board_options(memctl_options_t *popts,
dimm_params_t *pdimm,
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;
}
#ifdef CONFIG_SPD_EEPROM
/*
* Workaround for hardware errata. An i2c address conflict
* existed on earlier boards; the workaround moved the DDR
* SPD from 0x51 to 0x53. So we try and read 0x53 1st, and
* if that fails, then fall back to reading at 0x51.
*/
void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
{
int ret;
#ifdef ALT_SPD_EEPROM_ADDRESS
if (i2c_address == SPD_EEPROM_ADDRESS) {
ret = i2c_read(ALT_SPD_EEPROM_ADDRESS, 0, 1, (uchar *)spd,
sizeof(generic_spd_eeprom_t));
if (ret == 0)
return; /* Good data at 0x53 */
memset(spd, 0, sizeof(generic_spd_eeprom_t));
}
#endif
ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
sizeof(generic_spd_eeprom_t));
if (ret) {
printf("DDR: failed to read SPD from addr %u\n", i2c_address);
memset(spd, 0, sizeof(generic_spd_eeprom_t));
}
}
#else
/*
* fixed_sdram init -- doesn't use serial presence detect.
* Assumes 256MB DDR2 SDRAM SODIMM, without ECC, running at DDR400 speed.
*/
phys_size_t fixed_sdram(void)
{
struct ccsr_ddr __iomem *ddr =
(struct ccsr_ddr __iomem *)(CONFIG_SYS_FSL_DDR_ADDR);
out_be32(&ddr->cs0_bnds, 0x0000007f);
out_be32(&ddr->cs1_bnds, 0x008000ff);
out_be32(&ddr->cs2_bnds, 0x00000000);
out_be32(&ddr->cs3_bnds, 0x00000000);
out_be32(&ddr->cs0_config, 0x80010101);
out_be32(&ddr->cs1_config, 0x80010101);
out_be32(&ddr->cs2_config, 0x00000000);
out_be32(&ddr->cs3_config, 0x00000000);
out_be32(&ddr->timing_cfg_3, 0x00000000);
out_be32(&ddr->timing_cfg_0, 0x00220802);
out_be32(&ddr->timing_cfg_1, 0x38377322);
out_be32(&ddr->timing_cfg_2, 0x0fa044C7);
out_be32(&ddr->sdram_cfg, 0x4300C000);
out_be32(&ddr->sdram_cfg_2, 0x24401000);
out_be32(&ddr->sdram_mode, 0x23C00542);
out_be32(&ddr->sdram_mode_2, 0x00000000);
out_be32(&ddr->sdram_interval, 0x05080100);
out_be32(&ddr->sdram_md_cntl, 0x00000000);
out_be32(&ddr->sdram_data_init, 0x00000000);
out_be32(&ddr->sdram_clk_cntl, 0x03800000);
asm("sync;isync;msync");
udelay(500);
#ifdef CONFIG_DDR_ECC
/* Enable ECC checking */
out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL | 0x20000000);
#else
out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL);
#endif
return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
}
#endif