[U-Boot] [RFC PATCH 1/2] arm64: zynqmp: Setup the first boot_target at run time

[Michal Simek <michal.simek@xilinx.com>]

Detect mmc alias at run time for setting up proper boot_targets sequence.
The first target has to correspond with boot mode.

The purpose of this patch is to get rid of CONFIG_ZYNQ_SDHCI0/1
parameters in full U-Boot.
Unfortunately this patch can't remove it because there is missing
mmc implementation for SPL_DM_SEQ_ALIAS.

Also xilinx_zynqmp.h only setup boot commands for mmc0 and mmc1.
It means using aliases with higher number won't work. But switching
between mmc0 and mmc1 should work properly.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

Not sure how exactly to tune BOOT_TARGET_DEVICES_MMC to have functions
for different aliases ID. I can simply setup devnum based on dev->seq
and also generate the whole bootcmd_mmc0

bootcmd_mmc0=setenv devnum 0; run mmc_boot
bootcmd_mmc1=setenv devnum 1; run mmc_boot

The second patch is doing that.
But still if you setup alias to higher number mmc core is not mmc dev
command is not able to work with it.
---
 board/xilinx/zynqmp/zynqmp.c | 45 ++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 10 deletions(-)

diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index f7fe1fdfff7b..96ea0f578d30 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -16,6 +16,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/psu_init_gpl.h>
 #include <asm/io.h>
+#include <dm/device.h>
 #include <dm/uclass.h>
 #include <usb.h>
 #include <dwc3-uboot.h>
@@ -454,6 +455,9 @@ int board_late_init(void)
 {
 	u32 reg = 0;
 	u8 bootmode;
+	struct udevice *dev;
+	int bootseq = -1;
+	int bootseq_len = 0;
 	int env_targets_len = 0;
 	const char *mode;
 	char *new_targets;
@@ -499,7 +503,15 @@ int board_late_init(void)
 		break;
 	case SD_MODE:
 		puts("SD_MODE\n");
-		mode = "mmc0";
+		if (uclass_get_device_by_name(UCLASS_MMC,
+					      "sdhci at ff160000", &dev)) {
+			puts("Boot from SD0 but without SD0 enabled!\n");
+			return -1;
+		}
+		debug("mmc0 device found at %p, seq %d\n", dev, dev->seq);
+
+		mode = "mmc";
+		bootseq = dev->seq;
 		env_set("modeboot", "sdboot");
 		break;
 	case SD1_LSHFT_MODE:
@@ -507,12 +519,15 @@ int board_late_init(void)
 		/* fall through */
 	case SD_MODE1:
 		puts("SD_MODE1\n");
-#if defined(CONFIG_ZYNQ_SDHCI0) && defined(CONFIG_ZYNQ_SDHCI1)
-		mode = "mmc1";
-		env_set("sdbootdev", "1");
-#else
-		mode = "mmc0";
-#endif
+		if (uclass_get_device_by_name(UCLASS_MMC,
+					      "sdhci at ff170000", &dev)) {
+			puts("Boot from SD1 but without SD1 enabled!\n");
+			return -1;
+		}
+		debug("mmc1 device found at %p, seq %d\n", dev, dev->seq);
+
+		mode = "mmc";
+		bootseq = dev->seq;
 		env_set("modeboot", "sdboot");
 		break;
 	case NAND_MODE:
@@ -526,6 +541,11 @@ int board_late_init(void)
 		break;
 	}
 
+	if (bootseq >= 0) {
+		bootseq_len = snprintf(NULL, 0, "%i", bootseq);
+		debug("Bootseq len: %x\n", bootseq_len);
+	}
+
 	/*
 	 * One terminating char + one byte for space between mode
 	 * and default boot_targets
@@ -534,10 +554,15 @@ int board_late_init(void)
 	if (env_targets)
 		env_targets_len = strlen(env_targets);
 
-	new_targets = calloc(1, strlen(mode) + env_targets_len + 2);
+	new_targets = calloc(1, strlen(mode) + env_targets_len + 2 +
+			     bootseq_len);
 
-	sprintf(new_targets, "%s %s", mode,
-		env_targets ? env_targets : "");
+	if (bootseq >= 0)
+		sprintf(new_targets, "%s%x %s", mode, bootseq,
+			env_targets ? env_targets : "");
+	else
+		sprintf(new_targets, "%s %s", mode,
+			env_targets ? env_targets : "");
 
 	env_set("boot_targets", new_targets);
 
-- 
2.17.0