u-boot/board/varisys/cyrus/ddr.c
Andy Fleming 87e29878ca mpc85xx: Add support for the Varisys Cyrus board
This board runs a P5020 or P5040 chip, and utilizes
an EEPROM with similar formatting to the Freescale P5020DS.

Large amounts of this code were developed by
Adrian Cox <adrian at humboldt dot co dot uk>

Signed-off-by: Andy Fleming <afleming@gmail.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2015-11-04 15:19:34 -08:00

188 lines
4.9 KiB
C

/*
* Based on corenet_ds ddr code
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <hwconfig.h>
#include <asm/mmu.h>
#include <fsl_ddr_sdram.h>
#include <fsl_ddr_dimm_params.h>
#include <asm/fsl_law.h>
DECLARE_GLOBAL_DATA_PTR;
struct board_specific_parameters {
u32 n_ranks;
u32 datarate_mhz_high;
u32 clk_adjust;
u32 wrlvl_start;
u32 cpo;
u32 write_data_delay;
u32 force_2t;
};
/*
* This table contains all valid speeds we want to override with board
* specific parameters. datarate_mhz_high values need to be in ascending order
* for each n_ranks group.
*/
static const struct board_specific_parameters udimm0[] = {
/*
* memory controller 0
* num| hi| clk| wrlvl | cpo |wrdata|2T
* ranks| mhz|adjst| start | |delay |
*/
{4, 850, 4, 6, 0xff, 2, 0},
{4, 950, 5, 7, 0xff, 2, 0},
{4, 1050, 5, 8, 0xff, 2, 0},
{4, 1250, 5, 10, 0xff, 2, 0},
{4, 1350, 5, 11, 0xff, 2, 0},
{4, 1666, 5, 12, 0xff, 2, 0},
{2, 850, 5, 6, 0xff, 2, 0},
{2, 1050, 5, 7, 0xff, 2, 0},
{2, 1250, 4, 6, 0xff, 2, 0},
{2, 1350, 5, 7, 0xff, 2, 0},
{2, 1666, 5, 8, 0xff, 2, 0},
{1, 1250, 4, 6, 0xff, 2, 0},
{1, 1335, 4, 7, 0xff, 2, 0},
{1, 1666, 4, 8, 0xff, 2, 0},
{}
};
/*
* The two slots have slightly different timing. The center values are good
* for both slots. We use identical speed tables for them. In future use, if
* DIMMs have fewer center values that require two separated tables, copy the
* udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
*/
static const struct board_specific_parameters *udimms[] = {
udimm0,
udimm0,
};
static const struct board_specific_parameters rdimm0[] = {
/*
* memory controller 0
* num| hi| clk| wrlvl | cpo |wrdata|2T
* ranks| mhz|adjst| start | |delay |
*/
{4, 850, 4, 6, 0xff, 2, 0},
{4, 950, 5, 7, 0xff, 2, 0},
{4, 1050, 5, 8, 0xff, 2, 0},
{4, 1250, 5, 10, 0xff, 2, 0},
{4, 1350, 5, 11, 0xff, 2, 0},
{4, 1666, 5, 12, 0xff, 2, 0},
{2, 850, 4, 6, 0xff, 2, 0},
{2, 1050, 4, 7, 0xff, 2, 0},
{2, 1666, 4, 8, 0xff, 2, 0},
{1, 850, 4, 5, 0xff, 2, 0},
{1, 950, 4, 7, 0xff, 2, 0},
{1, 1666, 4, 8, 0xff, 2, 0},
{}
};
/*
* The two slots have slightly different timing. See comments above.
*/
static const struct board_specific_parameters *rdimms[] = {
rdimm0,
rdimm0,
};
void fsl_ddr_board_options(memctl_options_t *popts,
dimm_params_t *pdimm,
unsigned int ctrl_num)
{
const struct board_specific_parameters *pbsp, *pbsp_highest = NULL;
ulong ddr_freq;
if (ctrl_num > 1) {
printf("Wrong parameter for controller number %d", ctrl_num);
return;
}
if (!pdimm->n_ranks)
return;
if (popts->registered_dimm_en)
pbsp = rdimms[ctrl_num];
else
pbsp = udimms[ctrl_num];
/* Get clk_adjust, cpo, write_data_delay,2T, according to the board ddr
* freqency and n_banks specified in board_specific_parameters table.
*/
ddr_freq = get_ddr_freq(0) / 1000000;
while (pbsp->datarate_mhz_high) {
if (pbsp->n_ranks == pdimm->n_ranks) {
if (ddr_freq <= pbsp->datarate_mhz_high) {
popts->cpo_override = pbsp->cpo;
popts->write_data_delay =
pbsp->write_data_delay;
popts->clk_adjust = pbsp->clk_adjust;
popts->wrlvl_start = pbsp->wrlvl_start;
popts->twot_en = pbsp->force_2t;
goto found;
}
pbsp_highest = pbsp;
}
pbsp++;
}
if (pbsp_highest) {
printf("Error: board specific timing not found for data rate %lu MT/s!\nTrying to use the highest speed (%u) parameters\n",
ddr_freq, pbsp_highest->datarate_mhz_high);
popts->cpo_override = pbsp_highest->cpo;
popts->write_data_delay = pbsp_highest->write_data_delay;
popts->clk_adjust = pbsp_highest->clk_adjust;
popts->wrlvl_start = pbsp_highest->wrlvl_start;
popts->twot_en = pbsp_highest->force_2t;
} else {
panic("DIMM is not supported by this board");
}
found:
/*
* Factors to consider for half-strength driver enable:
* - number of DIMMs installed
*/
popts->half_strength_driver_enable = 0;
/*
* Write leveling override
*/
popts->wrlvl_override = 1;
popts->wrlvl_sample = 0xf;
/*
* Rtt and Rtt_WR override
*/
popts->rtt_override = 0;
/* Enable ZQ calibration */
popts->zq_en = 1;
/* DHC_EN =1, ODT = 60 Ohm */
popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
}
phys_size_t initdram(int board_type)
{
phys_size_t dram_size;
puts("Initializing....");
if (!fsl_use_spd())
panic("Cyrus only supports using SPD for DRAM\n");
puts("using SPD\n");
dram_size = fsl_ddr_sdram();
dram_size = setup_ddr_tlbs(dram_size / 0x100000);
dram_size *= 0x100000;
debug(" DDR: ");
return dram_size;
}