xilinx: board: Add support for additional card detection

The most of Xilinx evaluation boards have FMC connectors which contain
small eeprom for card identification. That's why read content of eeprom and
record it.
Also generate cardX_ variables for easier script handling.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

board/xilinx/common/board.c

@@ -62,7 +62,8 @@ struct xilinx_board_description {
 	u8 mac_addr[EEPROM_HDR_NO_OF_MAC_ADDR][EEPROM_HDR_ETH_ALEN + 1];
 };
 
-static struct xilinx_board_description *board_info;
+static int highest_id = -1;
+static struct xilinx_board_description **board_info;
 
 #define XILINX_I2C_DETECTION_BITS	8
 
@@ -191,15 +192,16 @@ static int xilinx_read_eeprom_single(char *name,
 
 __maybe_unused int xilinx_read_eeprom(void)
 {
-	int id, highest_id;
+	int id, ret;
 	char name_buf[8]; /* 8 bytes should be enough for nvmem+number */
+	struct xilinx_board_description *desc;
 
 	highest_id = dev_read_alias_highest_id("nvmem");
 	/* No nvmem aliases present */
 	if (highest_id < 0)
 		return -EINVAL;
 
-	board_info = calloc(1, sizeof(*board_info));
+	board_info = calloc(1, sizeof(desc) * highest_id);
 	if (!board_info)
 		return -ENOMEM;
 
@@ -209,12 +211,28 @@ __maybe_unused int xilinx_read_eeprom(void)
 	for (id = 0; id <= highest_id; id++) {
 		snprintf(name_buf, sizeof(name_buf), "nvmem%d", id);
 
+		/* Alloc structure */
+		desc = board_info[id];
+		if (!desc) {
+			desc = calloc(1, sizeof(*desc));
+			if (!desc)
+				return -ENOMEM;
+
+			board_info[id] = desc;
+		}
+
 		/* Ignoring return value for supporting multiple chips */
-		xilinx_read_eeprom_single(name_buf, board_info);
+		ret = xilinx_read_eeprom_single(name_buf, desc);
+		if (ret) {
+			free(desc);
+			board_info[id] = NULL;
+		}
 	}
 
-	if (board_info->header != EEPROM_HEADER_MAGIC)
-		free(board_info);
+	/*
+	 * Consider to clean board_info structure when board/cards are not
+	 * detected.
+	 */
 
 	return 0;
 }
@@ -253,10 +271,23 @@ void *board_fdt_blob_setup(void)
 }
 #endif
 
+static int env_set_by_index(const char *name, int index, char *data)
+{
+	char var[32];
+
+	if (!index)
+		sprintf(var, "board_%s", name);
+	else
+		sprintf(var, "card%d_%s", index, name);
+
+	return env_set(var, data);
+}
+
 int board_late_init_xilinx(void)
 {
 	u32 ret = 0;
-	int i;
+	int i, id, macid = 0;
+	struct xilinx_board_description *desc;
 	phys_size_t bootm_size = gd->ram_size;
 
 	if (CONFIG_IS_ENABLED(ARCH_ZYNQ))
@@ -267,27 +298,33 @@ int board_late_init_xilinx(void)
 	ret |= env_set_addr("bootm_low", (void *)gd->ram_base);
 	ret |= env_set_addr("bootm_size", (void *)bootm_size);
 
-	if (board_info) {
-		if (board_info->manufacturer)
-			ret |= env_set("manufacturer",
-				       board_info->manufacturer);
-		if (board_info->name)
-			ret |= env_set("board_name", board_info->name);
-		if (board_info->revision)
-			ret |= env_set("board_rev", board_info->revision);
-		if (board_info->serial)
-			ret |= env_set("board_serial", board_info->serial);
-
-		for (i = 0; i < EEPROM_HDR_NO_OF_MAC_ADDR; i++) {
-			if (!board_info->mac_addr[i])
-				continue;
+	for (id = 0; id <= highest_id; id++) {
+		desc = board_info[id];
+		if (desc && desc->header == EEPROM_HEADER_MAGIC) {
+			if (desc->manufacturer[0])
+				ret |= env_set_by_index("manufacturer", id,
+							desc->manufacturer);
+			if (desc->name[0])
+				ret |= env_set_by_index("name", id,
+							desc->name);
+			if (desc->revision[0])
+				ret |= env_set_by_index("rev", id,
+							desc->revision);
+			if (desc->serial[0])
+				ret |= env_set_by_index("serial", id,
+							desc->serial);
 
 			if (!CONFIG_IS_ENABLED(NET))
 				continue;
 
-			if (is_valid_ethaddr((const u8 *)board_info->mac_addr[i]))
-				ret |= eth_env_set_enetaddr_by_index("eth", i,
-						board_info->mac_addr[i]);
+			for (i = 0; i < EEPROM_HDR_NO_OF_MAC_ADDR; i++) {
+				if (!desc->mac_addr[i])
+					continue;
+
+				if (is_valid_ethaddr((const u8 *)desc->mac_addr[i]))
+					ret |= eth_env_set_enetaddr_by_index("eth",
+							macid++, desc->mac_addr[i]);
+			}
 		}
 	}