mpc85xx: Add support for the Varisys Cyrus board
This board runs a P5020 or P5040 chip, and utilizes
an EEPROM with similar formatting to the Freescale P5020DS.
Large amounts of this code were developed by
Adrian Cox <adrian at humboldt dot co dot uk>
Signed-off-by: Andy Fleming <afleming@gmail.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/varisys/cyrus/ddr.c b/board/varisys/cyrus/ddr.c
new file mode 100644
index 0000000..bb1d29a
--- /dev/null
+++ b/board/varisys/cyrus/ddr.c
@@ -0,0 +1,188 @@
+/*
+ * Based on corenet_ds ddr code
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <hwconfig.h>
+#include <asm/mmu.h>
+#include <fsl_ddr_sdram.h>
+#include <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 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 | cpo |wrdata|2T
+ * ranks| mhz|adjst| start | |delay |
+ */
+ {4, 850, 4, 6, 0xff, 2, 0},
+ {4, 950, 5, 7, 0xff, 2, 0},
+ {4, 1050, 5, 8, 0xff, 2, 0},
+ {4, 1250, 5, 10, 0xff, 2, 0},
+ {4, 1350, 5, 11, 0xff, 2, 0},
+ {4, 1666, 5, 12, 0xff, 2, 0},
+ {2, 850, 5, 6, 0xff, 2, 0},
+ {2, 1050, 5, 7, 0xff, 2, 0},
+ {2, 1250, 4, 6, 0xff, 2, 0},
+ {2, 1350, 5, 7, 0xff, 2, 0},
+ {2, 1666, 5, 8, 0xff, 2, 0},
+ {1, 1250, 4, 6, 0xff, 2, 0},
+ {1, 1335, 4, 7, 0xff, 2, 0},
+ {1, 1666, 4, 8, 0xff, 2, 0},
+ {}
+};
+
+/*
+ * The two slots have slightly different timing. The center values are good
+ * for both slots. We use identical speed tables for them. In future use, if
+ * DIMMs have fewer center values that require two separated tables, copy the
+ * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start.
+ */
+static const struct board_specific_parameters *udimms[] = {
+ udimm0,
+ udimm0,
+};
+
+static const struct board_specific_parameters rdimm0[] = {
+ /*
+ * memory controller 0
+ * num| hi| clk| wrlvl | cpo |wrdata|2T
+ * ranks| mhz|adjst| start | |delay |
+ */
+ {4, 850, 4, 6, 0xff, 2, 0},
+ {4, 950, 5, 7, 0xff, 2, 0},
+ {4, 1050, 5, 8, 0xff, 2, 0},
+ {4, 1250, 5, 10, 0xff, 2, 0},
+ {4, 1350, 5, 11, 0xff, 2, 0},
+ {4, 1666, 5, 12, 0xff, 2, 0},
+ {2, 850, 4, 6, 0xff, 2, 0},
+ {2, 1050, 4, 7, 0xff, 2, 0},
+ {2, 1666, 4, 8, 0xff, 2, 0},
+ {1, 850, 4, 5, 0xff, 2, 0},
+ {1, 950, 4, 7, 0xff, 2, 0},
+ {1, 1666, 4, 8, 0xff, 2, 0},
+ {}
+};
+
+/*
+ * The two slots have slightly different timing. See comments above.
+ */
+static const struct board_specific_parameters *rdimms[] = {
+ rdimm0,
+ 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 > 1) {
+ printf("Wrong parameter for controller number %d", ctrl_num);
+ return;
+ }
+ if (!pdimm->n_ranks)
+ return;
+
+ if (popts->registered_dimm_en)
+ pbsp = rdimms[ctrl_num];
+ else
+ pbsp = udimms[ctrl_num];
+
+
+ /* 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->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!\nTrying 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->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 = 60 Ohm */
+ popts->ddr_cdr1 = DDR_CDR1_DHC_EN;
+}
+
+phys_size_t initdram(int board_type)
+{
+ phys_size_t dram_size;
+
+ puts("Initializing....");
+
+ if (!fsl_use_spd())
+ panic("Cyrus only supports using SPD for DRAM\n");
+
+ puts("using SPD\n");
+ dram_size = fsl_ddr_sdram();
+
+ dram_size = setup_ddr_tlbs(dram_size / 0x100000);
+ dram_size *= 0x100000;
+
+ debug(" DDR: ");
+ return dram_size;
+}