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, 102 insertions, 0 deletions

diff --git a/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c b/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c
new file mode 100644
index 0000000000..c9c6899e72
--- /dev/null
+++ b/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ */
+
+#include "mv_ddr_regs.h"
+#include "mv_ddr_sys_env_lib.h"
+
+static u32 mv_ddr_board_id_get(void)
+{
+#if defined(CONFIG_TARGET_DB_88F6820_GP)
+	return DB_GP_68XX_ID;
+#else
+	/*
+	 * Return 0 here for custom board as this should not be used
+	 * for custom boards.
+	 */
+	return 0;
+#endif
+}
+
+static u32 mv_ddr_board_id_index_get(u32 board_id)
+{
+	/*
+	 * Marvell Boards use 0x10 as base for Board ID:
+	 * mask MSB to receive index for board ID
+	 */
+	return board_id & (MARVELL_BOARD_ID_MASK - 1);
+}
+
+/*
+ * read gpio input for suspend-wakeup indication
+ * return indicating suspend wakeup status:
+ * 0 - not supported,
+ * 1 - supported: read magic word detect wakeup,
+ * 2 - detected wakeup from gpio
+ */
+enum suspend_wakeup_status mv_ddr_sys_env_suspend_wakeup_check(void)
+{
+	u32 reg, board_id_index, gpio;
+	struct board_wakeup_gpio board_gpio[] = MV_BOARD_WAKEUP_GPIO_INFO;
+
+	board_id_index = mv_ddr_board_id_index_get(mv_ddr_board_id_get());
+	if (!(sizeof(board_gpio) / sizeof(struct board_wakeup_gpio) >
+	      board_id_index)) {
+		printf("\n_failed loading Suspend-Wakeup information (invalid board ID)\n");
+		return SUSPEND_WAKEUP_DISABLED;
+	}
+
+	/*
+	 * - Detect if Suspend-Wakeup is supported on current board
+	 * - Fetch the GPIO number for wakeup status input indication
+	 */
+	if (board_gpio[board_id_index].gpio_num == -1) {
+		/* Suspend to RAM is not supported */
+		return SUSPEND_WAKEUP_DISABLED;
+	} else if (board_gpio[board_id_index].gpio_num == -2) {
+		/*
+		 * Suspend to RAM is supported but GPIO indication is
+		 * not implemented - Skip
+		 */
+		return SUSPEND_WAKEUP_ENABLED;
+	} else {
+		gpio = board_gpio[board_id_index].gpio_num;
+	}
+
+	/* Initialize MPP for GPIO (set MPP = 0x0) */
+	reg = reg_read(MPP_CONTROL_REG(MPP_REG_NUM(gpio)));
+	/* reset MPP21 to 0x0, keep rest of MPP settings*/
+	reg &= ~MPP_MASK(gpio);
+	reg_write(MPP_CONTROL_REG(MPP_REG_NUM(gpio)), reg);
+
+	/* Initialize GPIO as input */
+	reg = reg_read(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio)));
+	reg |= GPP_MASK(gpio);
+	reg_write(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio)), reg);
+
+	/*
+	 * Check GPP for input status from PIC: 0 - regular init,
+	 * 1 - suspend wakeup
+	 */
+	reg = reg_read(GPP_DATA_IN_REG(GPP_REG_NUM(gpio)));
+
+	/* if GPIO is ON: wakeup from S2RAM indication detected */
+	return (reg & GPP_MASK(gpio)) ? SUSPEND_WAKEUP_ENABLED_GPIO_DETECTED :
+		SUSPEND_WAKEUP_DISABLED;
+}
+
+/*
+ * get bit mask of enabled cs
+ * return bit mask of enabled cs:
+ * 1 - only cs0 enabled,
+ * 3 - both cs0 and cs1 enabled
+ */
+u32 mv_ddr_sys_env_get_cs_ena_from_reg(void)
+{
+	return reg_read(DDR3_RANK_CTRL_REG) &
+		((CS_EXIST_MASK << CS_EXIST_OFFS(0)) |
+		 (CS_EXIST_MASK << CS_EXIST_OFFS(1)) |
+		 (CS_EXIST_MASK << CS_EXIST_OFFS(2)) |
+		 (CS_EXIST_MASK << CS_EXIST_OFFS(3)));
+}