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-rw-r--r--board/freescale/p2041rdb/ddr.c115
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diff --git a/board/freescale/p2041rdb/ddr.c b/board/freescale/p2041rdb/ddr.c
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+/*
+ * Copyright 2011 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 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>
+
+typedef struct {
+ u32 datarate_mhz_low;
+ u32 datarate_mhz_high;
+ u32 n_ranks;
+ u32 clk_adjust;
+ u32 wrlvl_start;
+ u32 cpo;
+ u32 write_data_delay;
+ u32 force_2T;
+} board_specific_parameters_t;
+
+/*
+ * ranges for parameters:
+ * wr_data_delay = 0-6
+ * clk adjust = 0-8
+ * cpo 2-0x1E (30)
+ */
+const board_specific_parameters_t board_specific_parameters[] = {
+ /*
+ * memory controller 0
+ * lo| hi| num| clk| wrlvl | cpo |wrdata|2T
+ * mhz| mhz|ranks|adjst| start | delay|
+ */
+ { 1017, 1116, 2, 4, 6, 0xff, 2, 0},
+};
+
+void fsl_ddr_board_options(memctl_options_t *popts,
+ dimm_params_t *pdimm,
+ unsigned int ctrl_num)
+{
+ const board_specific_parameters_t *pbsp =
+ &board_specific_parameters[0];
+ u32 num_params = ARRAY_SIZE(board_specific_parameters);
+ u32 i;
+ ulong ddr_freq;
+
+ /*
+ * 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;
+ for (i = 0; i < num_params; i++) {
+ if (ddr_freq >= pbsp->datarate_mhz_low &&
+ ddr_freq <= pbsp->datarate_mhz_high &&
+ pdimm[0].n_ranks == pbsp->n_ranks) {
+ 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;
+ break;
+ }
+ pbsp++;
+ }
+
+ if (i == num_params) {
+ printf("Warning: board specific timing not found "
+ "for data rate %lu MT/s!\n", ddr_freq);
+ }
+
+ /*
+ * 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 = 0;
+
+ puts("Initializing....");
+
+ if (fsl_use_spd()) {
+ puts("using SPD\n");
+ dram_size = fsl_ddr_sdram();
+ } else {
+ puts("no SPD and fixed parameters\n");
+ return dram_size;
+ }
+
+ dram_size = setup_ddr_tlbs(dram_size / 0x100000);
+ dram_size *= 0x100000;
+
+ puts(" DDR: ");
+ return dram_size;
+}