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-rw-r--r--board/freescale/t4qds/ddr.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/board/freescale/t4qds/ddr.c b/board/freescale/t4qds/ddr.c
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+++ b/board/freescale/t4qds/ddr.c
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+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * Version 2 or later as published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <hwconfig.h>
+#include <asm/mmu.h>
+#include <asm/fsl_ddr_sdram.h>
+#include <asm/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 wrlvl_ctl_2;
+ u32 wrlvl_ctl_3;
+ 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 | wrlvl | wrlvl | cpo |wrdata|2T
+ * ranks| mhz|adjst| start | ctl2 | ctl3 | |delay |
+ */
+ {2, 1350, 5, 7, 0x0809090b, 0x0c0c0d09, 0xff, 2, 0},
+ {2, 1666, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0},
+ {2, 2140, 5, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0},
+ {1, 1350, 5, 8, 0x0809090b, 0x0c0c0d0a, 0xff, 2, 0},
+ {1, 1700, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0},
+ {1, 1900, 4, 8, 0x080a0a0c, 0x0e0e0f0a, 0xff, 2, 0},
+ {1, 2140, 4, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0},
+ {}
+};
+
+/*
+ * The three slots have slightly different timing. The center values are good
+ * for all slots. We use identical speed tables for them. In future use, if
+ * DIMMs require separated tables, make more entries as needed.
+ */
+static const struct board_specific_parameters *udimms[] = {
+ udimm0,
+};
+
+static const struct board_specific_parameters rdimm0[] = {
+ /*
+ * memory controller 0
+ * num| hi| clk| wrlvl | wrlvl | wrlvl | cpo |wrdata|2T
+ * ranks| mhz|adjst| start | ctl2 | ctl3 | |delay |
+ */
+ {4, 1350, 5, 9, 0x08070605, 0x07080805, 0xff, 2, 0},
+ {4, 1666, 5, 8, 0x08070605, 0x07080805, 0xff, 2, 0},
+ {4, 2140, 5, 8, 0x08070605, 0x07081805, 0xff, 2, 0},
+ {2, 1350, 5, 7, 0x0809090b, 0x0c0c0d09, 0xff, 2, 0},
+ {2, 1666, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0},
+ {2, 2140, 5, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0},
+ {1, 1350, 5, 8, 0x0809090b, 0x0c0c0d0a, 0xff, 2, 0},
+ {1, 1700, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0},
+ {1, 1900, 4, 8, 0x080a0a0c, 0x0e0e0f0a, 0xff, 2, 0},
+ {1, 2140, 4, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0},
+ {}
+};
+
+/*
+ * The three slots have slightly different timing. See comments above.
+ */
+static const struct board_specific_parameters *rdimms[] = {
+ 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 > 2) {
+ printf("Not supported controller number %d\n", ctrl_num);
+ return;
+ }
+ if (!pdimm->n_ranks)
+ return;
+
+ /*
+ * we use identical timing for all slots. If needed, change the code
+ * to pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num];
+ */
+ if (popts->registered_dimm_en)
+ pbsp = rdimms[0];
+ else
+ pbsp = udimms[0];
+
+
+ /* 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->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
+ popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
+ 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\n"
+ "Trying 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->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2;
+ popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3;
+ 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 = 75 Ohm */
+ popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm);
+ popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm);
+}
+
+phys_size_t initdram(int board_type)
+{
+ phys_size_t dram_size;
+
+ puts("Initializing....using SPD\n");
+
+ dram_size = fsl_ddr_sdram();
+
+ dram_size = setup_ddr_tlbs(dram_size / 0x100000);
+ dram_size *= 0x100000;
+
+ puts(" DDR: ");
+ return dram_size;
+}