imx: dynamic setting mmcdev and mmcroot

Dynamic setting mmcdev and mmcroot.
Then when boot linux, we can have correct "root=/dev/mmcblk[x]p2"

Signed-off-by: Peng Fan <peng.fan@nxp.com>

arch/arm/include/asm/mach-imx/sys_proto.h

@@ -229,6 +229,8 @@ int mxs_reset_block(struct mxs_register_32 *reg);
 int mxs_wait_mask_set(struct mxs_register_32 *reg, u32 mask, u32 timeout);
 int mxs_wait_mask_clr(struct mxs_register_32 *reg, u32 mask, u32 timeout);
 
+void board_late_mmc_env_init(void);
+
 unsigned long call_imx_sip(unsigned long id, unsigned long reg0,
 			   unsigned long reg1, unsigned long reg2,
 			   unsigned long reg3);

board/freescale/common/Makefile

@@ -63,6 +63,9 @@ obj-$(CONFIG_ZM7300)		+= zm7300.o
 obj-$(CONFIG_POWER_PFUZE100)	+= pfuze.o
 obj-$(CONFIG_DM_PMIC_PFUZE100)	+= pfuze.o
 obj-$(CONFIG_POWER_MC34VR500)	+= mc34vr500.o
+ifneq (,$(filter $(SOC), imx8ulp))
+obj-y				+= mmc.o
+endif
 
 obj-$(CONFIG_LS102XA_STREAM_ID)	+= ls102xa_stream_id.o
 

board/freescale/common/mmc.c

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Copyright 2018-2022 NXP
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/arch/sys_proto.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+#include <stdbool.h>
+#include <mmc.h>
+#include <env.h>
+
+static int check_mmc_autodetect(void)
+{
+	char *autodetect_str = env_get("mmcautodetect");
+
+	if (autodetect_str && !strcmp(autodetect_str, "yes"))
+		return 1;
+
+	return 0;
+}
+
+/* This should be defined for each board */
+__weak int mmc_map_to_kernel_blk(int dev_no)
+{
+	return dev_no;
+}
+
+void board_late_mmc_env_init(void)
+{
+	char cmd[32];
+	char mmcblk[32];
+	u32 dev_no = mmc_get_env_dev();
+
+	if (!check_mmc_autodetect())
+		return;
+
+	env_set_ulong("mmcdev", dev_no);
+
+	/* Set mmcblk env */
+	sprintf(mmcblk, "/dev/mmcblk%dp2 rootwait rw", mmc_map_to_kernel_blk(dev_no));
+	env_set("mmcroot", mmcblk);
+
+	sprintf(cmd, "mmc dev %d", dev_no);
+	run_command(cmd, 0);
+}