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https://github.com/AsahiLinux/u-boot
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e7563aff17
The ddr code computes most things as 64-bit quantities and had some places in the middle that it was using phy_addr_t and phys_size_t. Instead we use unsigned long long through out and only at the last stage of setting the LAWs and reporting the amount of memory to the board code do we truncate down to what we can cover via phys_size_t. This has the added benefit that the DDR controller itself is always setup the same way regardless of how much memory we have. Its only the LAW setup that limits what is visible to the system. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
314 lines
7.9 KiB
C
314 lines
7.9 KiB
C
/*
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* Copyright (C) 2008 Freescale Semiconductor, Inc.
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* Dave Liu <daveliu@freescale.com>
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*
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* calculate the organization and timing parameter
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* from ddr3 spd, please refer to the spec
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* JEDEC standard No.21-C 4_01_02_11R18.pdf
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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 <asm/fsl_ddr_sdram.h>
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#include "ddr.h"
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/*
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* Calculate the Density of each Physical Rank.
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* Returned size is in bytes.
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*
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* each rank size =
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* sdram capacity(bit) / 8 * primary bus width / sdram width
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*
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* where: sdram capacity = spd byte4[3:0]
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* primary bus width = spd byte8[2:0]
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* sdram width = spd byte7[2:0]
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*
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* SPD byte4 - sdram density and banks
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* bit[3:0] size(bit) size(byte)
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* 0000 256Mb 32MB
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* 0001 512Mb 64MB
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* 0010 1Gb 128MB
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* 0011 2Gb 256MB
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* 0100 4Gb 512MB
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* 0101 8Gb 1GB
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* 0110 16Gb 2GB
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*
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* SPD byte8 - module memory bus width
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* bit[2:0] primary bus width
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* 000 8bits
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* 001 16bits
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* 010 32bits
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* 011 64bits
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*
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* SPD byte7 - module organiztion
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* bit[2:0] sdram device width
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* 000 4bits
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* 001 8bits
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* 010 16bits
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* 011 32bits
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*
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*/
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static unsigned long long
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compute_ranksize(const ddr3_spd_eeprom_t *spd)
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{
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unsigned long long bsize;
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int nbit_sdram_cap_bsize = 0;
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int nbit_primary_bus_width = 0;
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int nbit_sdram_width = 0;
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if ((spd->density_banks & 0xf) < 7)
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nbit_sdram_cap_bsize = (spd->density_banks & 0xf) + 28;
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if ((spd->bus_width & 0x7) < 4)
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nbit_primary_bus_width = (spd->bus_width & 0x7) + 3;
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if ((spd->organization & 0x7) < 4)
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nbit_sdram_width = (spd->organization & 0x7) + 2;
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bsize = 1 << (nbit_sdram_cap_bsize - 3
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+ nbit_primary_bus_width - nbit_sdram_width);
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debug("DDR: DDR III rank density = 0x%08x\n", bsize);
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return bsize;
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}
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/*
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* ddr_compute_dimm_parameters for DDR3 SPD
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*
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* Compute DIMM parameters based upon the SPD information in spd.
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* Writes the results to the dimm_params_t structure pointed by pdimm.
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*
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*/
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unsigned int
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ddr_compute_dimm_parameters(const ddr3_spd_eeprom_t *spd,
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dimm_params_t *pdimm,
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unsigned int dimm_number)
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{
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unsigned int retval;
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unsigned int mtb_ps;
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if (spd->mem_type) {
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if (spd->mem_type != SPD_MEMTYPE_DDR3) {
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printf("DIMM %u: is not a DDR3 SPD.\n", dimm_number);
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return 1;
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}
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} else {
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memset(pdimm, 0, sizeof(dimm_params_t));
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return 1;
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}
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retval = ddr3_spd_check(spd);
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if (retval) {
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printf("DIMM %u: failed checksum\n", dimm_number);
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return 2;
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}
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/*
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* The part name in ASCII in the SPD EEPROM is not null terminated.
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* Guarantee null termination here by presetting all bytes to 0
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* and copying the part name in ASCII from the SPD onto it
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*/
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memset(pdimm->mpart, 0, sizeof(pdimm->mpart));
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memcpy(pdimm->mpart, spd->mpart, sizeof(pdimm->mpart) - 1);
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/* DIMM organization parameters */
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pdimm->n_ranks = ((spd->organization >> 3) & 0x7) + 1;
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pdimm->rank_density = compute_ranksize(spd);
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pdimm->capacity = pdimm->n_ranks * pdimm->rank_density;
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pdimm->primary_sdram_width = 1 << (3 + (spd->bus_width & 0x7));
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if ((spd->bus_width >> 3) & 0x3)
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pdimm->ec_sdram_width = 8;
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else
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pdimm->ec_sdram_width = 0;
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pdimm->data_width = pdimm->primary_sdram_width
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+ pdimm->ec_sdram_width;
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switch (spd->module_type & 0xf) {
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case 0x01: /* RDIMM */
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case 0x05: /* Mini-RDIMM */
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pdimm->registered_dimm = 1; /* register buffered */
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break;
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case 0x02: /* UDIMM */
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case 0x03: /* SO-DIMM */
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case 0x04: /* Micro-DIMM */
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case 0x06: /* Mini-UDIMM */
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pdimm->registered_dimm = 0; /* unbuffered */
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break;
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default:
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printf("unknown dimm_type 0x%02X\n", spd->module_type);
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return 1;
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}
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/* SDRAM device parameters */
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pdimm->n_row_addr = ((spd->addressing >> 3) & 0x7) + 12;
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pdimm->n_col_addr = (spd->addressing & 0x7) + 9;
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pdimm->n_banks_per_sdram_device = 8 << ((spd->density_banks >> 4) & 0x7);
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/*
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* The SPD spec has not the ECC bit,
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* We consider the DIMM as ECC capability
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* when the extension bus exist
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*/
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if (pdimm->ec_sdram_width)
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pdimm->edc_config = 0x02;
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else
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pdimm->edc_config = 0x00;
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/*
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* The SPD spec has not the burst length byte
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* but DDR3 spec has nature BL8 and BC4,
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* BL8 -bit3, BC4 -bit2
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*/
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pdimm->burst_lengths_bitmask = 0x0c;
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pdimm->row_density = __ilog2(pdimm->rank_density);
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/* MTB - medium timebase
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* The unit in the SPD spec is ns,
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* We convert it to ps.
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* eg: MTB = 0.125ns (125ps)
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*/
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mtb_ps = (spd->mtb_dividend * 1000) /spd->mtb_divisor;
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pdimm->mtb_ps = mtb_ps;
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/*
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* sdram minimum cycle time
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* we assume the MTB is 0.125ns
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* eg:
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* tCK_min=15 MTB (1.875ns) ->DDR3-1066
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* =12 MTB (1.5ns) ->DDR3-1333
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* =10 MTB (1.25ns) ->DDR3-1600
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*/
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pdimm->tCKmin_X_ps = spd->tCK_min * mtb_ps;
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/*
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* CAS latency supported
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* bit4 - CL4
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* bit5 - CL5
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* bit18 - CL18
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*/
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pdimm->caslat_X = ((spd->caslat_msb << 8) | spd->caslat_lsb) << 4;
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/*
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* min CAS latency time
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* eg: tAA_min =
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* DDR3-800D 100 MTB (12.5ns)
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* DDR3-1066F 105 MTB (13.125ns)
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* DDR3-1333H 108 MTB (13.5ns)
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* DDR3-1600H 90 MTB (11.25ns)
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*/
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pdimm->tAA_ps = spd->tAA_min * mtb_ps;
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/*
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* min write recovery time
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* eg:
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* tWR_min = 120 MTB (15ns) -> all speed grades.
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*/
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pdimm->tWR_ps = spd->tWR_min * mtb_ps;
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/*
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* min RAS to CAS delay time
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* eg: tRCD_min =
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* DDR3-800 100 MTB (12.5ns)
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* DDR3-1066F 105 MTB (13.125ns)
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* DDR3-1333H 108 MTB (13.5ns)
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* DDR3-1600H 90 MTB (11.25)
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*/
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pdimm->tRCD_ps = spd->tRCD_min * mtb_ps;
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/*
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* min row active to row active delay time
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* eg: tRRD_min =
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* DDR3-800(1KB page) 80 MTB (10ns)
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* DDR3-1333(1KB page) 48 MTB (6ns)
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*/
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pdimm->tRRD_ps = spd->tRRD_min * mtb_ps;
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/*
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* min row precharge delay time
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* eg: tRP_min =
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* DDR3-800D 100 MTB (12.5ns)
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* DDR3-1066F 105 MTB (13.125ns)
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* DDR3-1333H 108 MTB (13.5ns)
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* DDR3-1600H 90 MTB (11.25ns)
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*/
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pdimm->tRP_ps = spd->tRP_min * mtb_ps;
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/* min active to precharge delay time
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* eg: tRAS_min =
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* DDR3-800D 300 MTB (37.5ns)
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* DDR3-1066F 300 MTB (37.5ns)
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* DDR3-1333H 288 MTB (36ns)
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* DDR3-1600H 280 MTB (35ns)
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*/
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pdimm->tRAS_ps = (((spd->tRAS_tRC_ext & 0xf) << 8) | spd->tRAS_min_lsb)
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* mtb_ps;
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/*
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* min active to actice/refresh delay time
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* eg: tRC_min =
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* DDR3-800D 400 MTB (50ns)
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* DDR3-1066F 405 MTB (50.625ns)
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* DDR3-1333H 396 MTB (49.5ns)
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* DDR3-1600H 370 MTB (46.25ns)
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*/
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pdimm->tRC_ps = (((spd->tRAS_tRC_ext & 0xf0) << 4) | spd->tRC_min_lsb)
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* mtb_ps;
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/*
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* min refresh recovery delay time
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* eg: tRFC_min =
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* 512Mb 720 MTB (90ns)
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* 1Gb 880 MTB (110ns)
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* 2Gb 1280 MTB (160ns)
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*/
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pdimm->tRFC_ps = ((spd->tRFC_min_msb << 8) | spd->tRFC_min_lsb)
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* mtb_ps;
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/*
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* min internal write to read command delay time
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* eg: tWTR_min = 40 MTB (7.5ns) - all speed bins.
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* tWRT is at least 4 mclk independent of operating freq.
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*/
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pdimm->tWTR_ps = spd->tWTR_min * mtb_ps;
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/*
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* min internal read to precharge command delay time
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* eg: tRTP_min = 40 MTB (7.5ns) - all speed bins.
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* tRTP is at least 4 mclk independent of operating freq.
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*/
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pdimm->tRTP_ps = spd->tRTP_min * mtb_ps;
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/*
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* Average periodic refresh interval
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* tREFI = 7.8 us at normal temperature range
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* = 3.9 us at ext temperature range
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*/
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pdimm->refresh_rate_ps = 7800000;
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/*
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* min four active window delay time
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* eg: tFAW_min =
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* DDR3-800(1KB page) 320 MTB (40ns)
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* DDR3-1066(1KB page) 300 MTB (37.5ns)
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* DDR3-1333(1KB page) 240 MTB (30ns)
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* DDR3-1600(1KB page) 240 MTB (30ns)
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*/
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pdimm->tFAW_ps = (((spd->tFAW_msb & 0xf) << 8) | spd->tFAW_min)
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* mtb_ps;
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/*
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* We need check the address mirror for unbuffered DIMM
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* If SPD indicate the address map mirror, The DDR controller
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* need care it.
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*/
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if ((spd->module_type == SPD_MODULETYPE_UDIMM) ||
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(spd->module_type == SPD_MODULETYPE_SODIMM) ||
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(spd->module_type == SPD_MODULETYPE_MICRODIMM) ||
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(spd->module_type == SPD_MODULETYPE_MINIUDIMM))
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pdimm->mirrored_dimm = spd->mod_section.unbuffered.addr_mapping & 0x1;
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return 0;
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}
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