ARM: mvebu: a38x: sync ddr training code with upstream

This syncs drivers/ddr/marvell/a38x/ with the mv_ddr-armada-17.10 branch
of https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell.git.

The upstream code is incorporated omitting the ddr4 and apn806 and
folding the nested a38x directory up one level. After that a
semi-automated step is used to drop unused features with unifdef

  find drivers/ddr/marvell/a38x/ -name '*.[ch]' | \
    xargs unifdef -m -UMV_DDR -UMV_DDR_ATF -UCONFIG_DDR4 \
		-UCONFIG_APN806 -UCONFIG_MC_STATIC \
		-UCONFIG_MC_STATIC_PRINT -UCONFIG_PHY_STATIC \
		-UCONFIG_64BIT

INTER_REGS_BASE is updated to be defined as SOC_REGS_PHY_BASE.

Some now empty files are removed and the ternary license is replaced
with a SPDX GPL-2.0+ identifier.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/ddr/marvell/a38x/mv_ddr_common.c b/drivers/ddr/marvell/a38x/mv_ddr_common.c
new file mode 100644
index 00000000000..7afabbfd880
--- /dev/null
+++ b/drivers/ddr/marvell/a38x/mv_ddr_common.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ */
+
+#include "mv_ddr_common.h"
+#include "ddr_ml_wrapper.h"
+
+void mv_ddr_ver_print(void)
+{
+	printf("%s %s\n", mv_ddr_version_string, mv_ddr_build_message);
+}
+
+/* ceiling division for positive integers */
+unsigned int ceil_div(unsigned int x, unsigned int y)
+{
+	return (x % y) ? (x / y + 1) : (x / y);
+}
+
+/*
+ * time to number of clocks calculation based on the rounding algorithm
+ * using 97.4% inverse factor per JEDEC Standard No. 21-C, 4.1.2.L-4:
+ * Serial Presence Detect (SPD) for DDR4 SDRAM Modules
+ */
+unsigned int time_to_nclk(unsigned int t, unsigned int tclk)
+{
+	/* t & tclk parameters are in ps */
+	return ((unsigned long)t * 1000 / tclk + 974) / 1000;
+}
+
+/* round division of two positive integers to the nearest whole number */
+int round_div(unsigned int dividend, unsigned int divisor, unsigned int *quotient)
+{
+	if (quotient == NULL) {
+		printf("%s: error: NULL quotient pointer found\n", __func__);
+		return MV_FAIL;
+	}
+
+	if (divisor == 0) {
+		printf("%s: error: division by zero\n", __func__);
+		return MV_FAIL;
+	} else {
+		*quotient = (dividend + divisor / 2) / divisor;
+	}
+
+	return MV_OK;
+}