arm: mvebu: drivers/ddr: Add DDR3 driver with training code from Marvell bin_hdr

This patch adds the DDR3 setup and training code taken from the Marvell
U-Boot repository. This code used to be included as a binary (bin_hdr)
into the AXP boot image. Not linked with the main U-Boot. With this code
addition and the following serdes/PHY setup code, the Armada-XP support
in mainline U-Boot is finally self-contained. So the complete image
for booting can be built from mainline U-Boot. Without any additional
external inclusion. Hopefully other MVEBU SoC's will follow here.

Support for some SoC's has been removed in this version. This is:

MV_MSYS:
The code referred to by the MV_MSYS define is currently unused. And its
not really planned to support this in mainline. So lets remove it to
make the code clearer and increase the readability.

MV88F68XX (A38x):
The code referred to by the MV88F68XX define (A38x) is currently unused.
And its partial and not sufficient for this device in this stage.
So lets remove it to make the code clearer and increase the readability.

MV88F66XX (ALP):
The code referred to by the MV88F66XX define is currently unused. And its
not really planned to support this in mainline. So lets remove it to
make the code clearer and increase the readability.

MV88F78X60_Z1:
The code referred to by the MV88F78X60_Z1 define is currently unused. As the
Z1 revision of the AXP is not supported in mainline anymore.
So lets remove it to make the code clearer and increase the readability.

Remove support for Z1 & A0 AXP revisions (steppings). The current stepping
is B0 and this is the only one that is actively supported in this code
version.

Tested on AXP using a SPD DIMM setup on the Marvell DB-MV784MP-GP board and
on a custom fixed DDR configuration board (maxbcm).

Note:
This code has undergone many hours of coding-style cleanup and refactoring.
It still is not checkpatch clean though, I'm afraid. As the factoring of the
code has so many levels of indentation that many lines are longer than 80
chars. This might be some task to tackly later on.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Luka Perkov <luka.perkov@sartura.hr>

1 files changed, 146 insertions, 0 deletions

diff --git a/drivers/ddr/mvebu/ddr3_axp_config.h b/drivers/ddr/mvebu/ddr3_axp_config.h
new file mode 100644
index 0000000000..800d2d1476
--- /dev/null
+++ b/drivers/ddr/mvebu/ddr3_axp_config.h
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#ifndef __DDR3_AXP_CONFIG_H
+#define __DDR3_AXP_CONFIG_H
+
+/*
+ * DDR3_LOG_LEVEL Information
+ *
+ * Level 0: Provides an error code in a case of failure, RL, WL errors
+ *          and other algorithm failure
+ * Level 1: Provides the D-Unit setup (SPD/Static configuration)
+ * Level 2: Provides the windows margin as a results of DQS centeralization
+ * Level 3: Provides the windows margin of each DQ as a results of DQS
+ *          centeralization
+ */
+#ifdef CONFIG_DDR_LOG_LEVEL
+#define	DDR3_LOG_LEVEL	CONFIG_DDR_LOG_LEVEL
+#else
+#define	DDR3_LOG_LEVEL	0
+#endif
+
+#define DDR3_PBS        1
+
+/* This flag allows the execution of SW WL/RL upon HW failure */
+#define DDR3_RUN_SW_WHEN_HW_FAIL    1
+
+/*
+ * General Configurations
+ *
+ * The following parameters are required for proper setup:
+ *
+ * DDR_TARGET_FABRIC   - Set desired fabric configuration
+ *                       (for sample@Reset fabfreq parameter)
+ * DRAM_ECC            - Set ECC support 1/0
+ * BUS_WIDTH           - 64/32 bit
+ * CONFIG_SPD_EEPROM   - Enables auto detection of DIMMs and their timing values
+ * DQS_CLK_ALIGNED     - Set this if CLK and DQS signals are aligned on board
+ * MIXED_DIMM_STATIC   - Mixed DIMM + On board devices support (ODT registers
+ *                       values are taken statically)
+ * DDR3_TRAINING_DEBUG - Debug prints of internal code
+ */
+#define DDR_TARGET_FABRIC			5
+#define DRAM_ECC				0
+
+#ifdef MV_DDR_32BIT
+#define BUS_WIDTH                               32
+#else
+#define BUS_WIDTH				64
+#endif
+
+#undef DQS_CLK_ALIGNED
+#undef MIXED_DIMM_STATIC
+#define DDR3_TRAINING_DEBUG			0
+#define REG_DIMM_SKIP_WL			0
+
+/* Marvell boards specific configurations */
+#if defined(DB_78X60_PCAC)
+#undef CONFIG_SPD_EEPROM
+#define STATIC_TRAINING
+#endif
+
+#if defined(DB_78X60_AMC)
+#undef CONFIG_SPD_EEPROM
+#undef  DRAM_ECC
+#define DRAM_ECC				1
+#endif
+
+#ifdef CONFIG_SPD_EEPROM
+/*
+ * DIMM support parameters:
+ * DRAM_2T - Set Desired 2T Mode - 0 - 1T, 0x1 - 2T, 0x2 - 3T
+ * DIMM_CS_BITMAP - bitmap representing the optional CS in DIMMs
+ * (0xF=CS0+CS1+CS2+CS3, 0xC=CS2+CS3...)
+ */
+#define DRAM_2T					0x0
+#define DIMM_CS_BITMAP				0xF
+#define DUNIT_SPD
+#endif
+
+#ifdef DRAM_ECC
+/*
+ * ECC support parameters:
+ *
+ * U_BOOT_START_ADDR, U_BOOT_SCRUB_SIZE - relevant when using ECC and need
+ * to configure the scrubbing area
+ */
+#define TRAINING_SIZE				0x20000
+#define U_BOOT_START_ADDR			0
+#define U_BOOT_SCRUB_SIZE			0x1000000 /* TRAINING_SIZE */
+#endif
+
+/*
+ * Registered DIMM Support - In case registered DIMM is attached,
+ * please supply the following values:
+ * (see JEDEC - JESD82-29A "Definition of the SSTE32882 Registering Clock
+ * Driver with Parity and Quad Chip
+ * Selects for DDR3/DDR3L/DDR3U RDIMM 1.5 V/1.35 V/1.25 V Applications")
+ * RC0: Global Features Control Word
+ * RC1: Clock Driver Enable Control Word
+ * RC2: Timing Control Word
+ * RC3-RC5 - taken from SPD
+ * RC8: Additional IBT Setting Control Word
+ * RC9: Power Saving Settings Control Word
+ * RC10: Encoding for RDIMM Operating Speed
+ * RC11: Operating Voltage VDD and VREFCA Control Word
+ */
+#define RDIMM_RC0				0
+#define RDIMM_RC1				0
+#define RDIMM_RC2				0
+#define RDIMM_RC8				0
+#define RDIMM_RC9				0
+#define RDIMM_RC10				0x2
+#define RDIMM_RC11				0x0
+
+#if defined(MIXED_DIMM_STATIC) || !defined(CONFIG_SPD_EEPROM)
+#define DUNIT_STATIC
+#endif
+
+#if defined(MIXED_DIMM_STATIC) || defined(CONFIG_SPD_EEPROM)
+/*
+ * This flag allows the user to change the dram refresh cycle in ps,
+ * only in case of SPD or MIX DIMM topology
+ */
+#define TREFI_USER_EN
+
+#ifdef TREFI_USER_EN
+#define TREFI_USER				3900000
+#endif
+#endif
+
+#ifdef CONFIG_SPD_EEPROM
+/*
+ * AUTO_DETECTION_SUPPORT - relevant ONLY for Marvell DB boards.
+ * Enables I2C auto detection different options
+ */
+#if defined(CONFIG_DB_88F78X60) || defined(CONFIG_DB_88F78X60_REV2) || \
+    defined(CONFIG_DB_784MP_GP)
+#define AUTO_DETECTION_SUPPORT
+#endif
+#endif
+
+#endif /* __DDR3_AXP_CONFIG_H */