X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Fboard%2Ffreescale%2Fmpc8349emds%2Fddr.c;fp=qemu%2Froms%2Fu-boot%2Fboard%2Ffreescale%2Fmpc8349emds%2Fddr.c;h=aae003d1210517a859eea3273534cb91045369fa;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/roms/u-boot/board/freescale/mpc8349emds/ddr.c b/qemu/roms/u-boot/board/freescale/mpc8349emds/ddr.c
new file mode 100644
index 000000000..aae003d12
--- /dev/null
+++ b/qemu/roms/u-boot/board/freescale/mpc8349emds/ddr.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#include <fsl_ddr_sdram.h>
+#include <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.
+ */
+static const struct board_specific_parameters udimm0[] = {
+	/*
+	 * memory controller 0
+	 *   num|  hi|  clk| cpo|wrdata|2T
+	 * ranks| mhz|adjst|    | delay|
+	 */
+	{2,  300,    4,   4,    2,  0},
+	{2,  365,    4,   6,    2,  0},
+	{2,  450,    4,   7,    2,  0},
+	{2,  850,    4,  31,    2,  0},
+	{1,  300,    4,   4,    2,  0},
+	{1,  365,    4,   6,    2,  0},
+	{1,  450,    4,   7,    2,  0},
+	{1,  850,    4,  31,    2,  0},
+	{}
+};
+
+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;
+	unsigned int i;
+	ulong ddr_freq;
+
+	if (ctrl_num != 0)	/* we have only one controller */
+		return;
+	for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) {
+		if (pdimm[i].n_ranks)
+			break;
+	}
+	if (i >= CONFIG_DIMM_SLOTS_PER_CTLR)	/* no DIMM */
+		return;
+
+	pbsp = udimm0;
+
+	/* 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[i].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->dqs_config = 0;	/* only true DQS signal is used on board */
+}