arm: mach-imx: Add command to expose QB functionality

This command exposes 3 methods:
- check -> checks if the data in volatile memory is valid
	   (integrity check)
- save  -> saves the data to non-volatile memory and
	   erases the data in volatile memory
- erase	-> erases the data in non-volatile memory

cmd_qb can be used either directly in the U-Boot console
or in an uuu script to save the QB data during flashing.
It supports specifying a different boot medium than the
current boot device for saving the data.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Simona Toaca <simona.toaca@nxp.com>

arch/arm/mach-imx/Kconfig

@@ -80,6 +80,17 @@ config IMX_QB
 	  memory to non-volatile storage. OEI uses the saved data to
 	  run Quickboot flow and skip re-training the DDR PHY.
 
+config CMD_IMX_QB
+	bool "Support the 'qb' command"
+	default y
+	depends on IMX_QB
+	help
+	  Enable qb command to write/erase DDR quick boot training
+	  data to/from a chosen boot device. Using 'qb save/erase'
+	  without arguments implies using the current boot device's
+	  first bootable partition (e.g. boot0 for eMMC). For use in
+	  uuu scripts, the boot device must be specified explicitly.
+
 config CMD_BMODE
 	bool "Support the 'bmode' command"
 	default y

arch/arm/mach-imx/Makefile

@@ -80,6 +80,7 @@ endif
 ifneq ($(CONFIG_XPL_BUILD),y)
 obj-$(CONFIG_CMD_BMODE) += cmd_bmode.o
 obj-$(CONFIG_CMD_HDMIDETECT) += cmd_hdmidet.o
+obj-$(CONFIG_CMD_IMX_QB) += cmd_qb.o
 obj-$(CONFIG_CMD_DEKBLOB) += cmd_dek.o
 obj-$(CONFIG_CMD_NANDBCB) += cmd_nandbcb.o
 endif

arch/arm/mach-imx/cmd_qb.c

@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/**
+ * Copyright 2024-2026 NXP
+ */
+#include <command.h>
+#include <spl.h>
+#include <stdlib.h>
+
+#include <asm/mach-imx/boot_mode.h>
+#include <asm/mach-imx/sys_proto.h>
+#include <asm/mach-imx/qb.h>
+
+static void parse_qb_args(int argc, char * const argv[],
+			  const char **ifname, const char **dev)
+{
+	/* qb save/erase -> use boot device */
+	if (argc < 2) {
+		*ifname = "auto";
+		return;
+	}
+
+	*ifname = argv[1];
+
+	if (argc == 3)
+		*dev = argv[2];
+}
+
+static int do_qb(struct cmd_tbl *cmdtp, int flag, int argc,
+		 char * const argv[], bool save)
+{
+	const char *ifname, *dev;
+
+	parse_qb_args(argc, argv, &ifname, &dev);
+
+	if (imx_qb(ifname, dev, save))
+		return CMD_RET_FAILURE;
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_qb_check(struct cmd_tbl *cmdtp, int flag,
+		       int argc, char * const argv[])
+{
+	return imx_qb_check() ? CMD_RET_SUCCESS : CMD_RET_FAILURE;
+}
+
+static int do_qb_save(struct cmd_tbl *cmdtp, int flag,
+		      int argc, char * const argv[])
+{
+	return do_qb(cmdtp, flag, argc, argv, true);
+}
+
+static int do_qb_erase(struct cmd_tbl *cmdtp, int flag,
+		       int argc, char * const argv[])
+{
+	return do_qb(cmdtp, flag, argc, argv, false);
+}
+
+static struct cmd_tbl cmd_qb[] = {
+	U_BOOT_CMD_MKENT(check, 1, 1, do_qb_check, "", ""),
+	U_BOOT_CMD_MKENT(save,  3, 1, do_qb_save,  "", ""),
+	U_BOOT_CMD_MKENT(erase, 3, 1, do_qb_erase, "", ""),
+};
+
+static int do_qbops(struct cmd_tbl *cmdtp, int flag, int argc,
+		    char *const argv[])
+{
+	struct cmd_tbl *cp;
+
+	cp = find_cmd_tbl(argv[1], cmd_qb, ARRAY_SIZE(cmd_qb));
+
+	/* Drop the qb command */
+	argc--;
+	argv++;
+
+	if (!cp) {
+		printf("qb: %s: command not found\n", argv[0] ? argv[0] : " ");
+		return CMD_RET_USAGE;
+	}
+
+	if (argc > cp->maxargs) {
+		printf("qb %s: too many arguments: %d > %d\n", cp->name,
+		       argc - 1, cp->maxargs - 1);
+		return CMD_RET_USAGE;
+	}
+
+	if (flag == CMD_FLAG_REPEAT && !cmd_is_repeatable(cp)) {
+		printf("qb %s: repeat flag set but command is not repeatable\n",
+		       cp->name);
+		return CMD_RET_SUCCESS;
+	}
+
+	return cp->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	qb, 4, 1, do_qbops,
+	"DDR Quick Boot sub system",
+	"check - check if quick boot data is stored in mem by training flow\n"
+	"qb save [interface] [dev]  - save quick boot data in NVM => trigger quick boot flow\n"
+	"qb erase [interface] [dev] - erase quick boot data from NVM => trigger training flow\n"
+);