Initial import of modified u-boot tree

Original upstream URL:
git://git.denx.de/u-boot.git

Original upstream GIT hash:
62c175fbb8a0f9a926c88294ea9f7e88eb898f6c

1 files changed, 129 insertions, 0 deletions

diff --git a/board/freescale/p2020ds/ddr.c b/board/freescale/p2020ds/ddr.c
new file mode 100644
index 0000000..59034f9
--- /dev/null
+++ b/board/freescale/p2020ds/ddr.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2008-2009 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 <asm/fsl_ddr_sdram.h>
+#include <asm/fsl_ddr_dimm_params.h>
+
+struct board_specific_parameters {
+	u32 n_ranks;
+	u32 datarate_mhz_high;
+	u32 clk_adjust;
+	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.
+ *
+ * ranges for parameters:
+ *  wr_data_delay = 0-6
+ *  clk adjust = 0-8
+ *  cpo 2-0x1E (30)
+ */
+static const struct board_specific_parameters dimm0[] = {
+	/*
+	 * memory controller 0
+	 *   num|  hi|  clk| cpo|wrdata|2T
+	 * ranks| mhz|adjst|    | delay|
+	 */
+#ifdef CONFIG_FSL_DDR2
+	{2,  549,    4,   0x1f,    2,  0},
+	{2,  680,    4,   0x1f,    3,  0},
+	{2,  850,    4,   0x1f,    4,  0},
+	{1,  549,    4,   0x1f,    2,  0},
+	{1,  680,    4,   0x1f,    3,  0},
+	{1,  850,    4,   0x1f,    4,  0},
+#else
+	{2,  850,    6,   0x1f,    4,  0},
+	{1,  850,    4,   0x1f,    4,  0},
+#endif
+	{}
+};
+
+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;
+	int i;
+
+	if (ctrl_num) {
+		printf("Wrong parameter for controller number %d", ctrl_num);
+		return;
+	}
+	if (!pdimm->n_ranks)
+		return;
+
+	/*
+	 * set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in
+	 * that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If
+	 * there are two dimms in the controller, set odt_rd_cfg to 3 and
+	 * odt_wr_cfg to 3 for the even CS, 0 for the odd CS.
+	 */
+	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
+		popts->cs_local_opts[i].odt_rd_cfg = 0;
+		popts->cs_local_opts[i].odt_wr_cfg = 1;
+	}
+
+	pbsp = dimm0;
+
+	/* 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->clk_adjust = pbsp->clk_adjust;
+				popts->cpo_override = pbsp->cpo;
+				popts->write_data_delay =
+					pbsp->write_data_delay;
+				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->clk_adjust = pbsp_highest->clk_adjust;
+		popts->cpo_override = pbsp_highest->cpo;
+		popts->write_data_delay = pbsp_highest->write_data_delay;
+		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;
+	popts->wrlvl_en = 1;
+	/* Write leveling override */
+	popts->wrlvl_override = 1;
+	popts->wrlvl_sample = 0xa;
+	popts->wrlvl_start = 0x8;
+	/* Rtt and Rtt_WR override */
+	popts->rtt_override = 1;
+	popts->rtt_override_value = DDR3_RTT_120_OHM;
+	popts->rtt_wr_override_value = 0; /* Rtt_WR= dynamic ODT off */
+}