spl: support loading from UBI volumes

Add support for loading from UBI volumes on the top of NAND
and OneNAND.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Heiko Schocher <hs@denx.de>

common/spl/Makefile

@@ -13,8 +13,11 @@ obj-$(CONFIG_SPL_FRAMEWORK) += spl.o
 obj-$(CONFIG_SPL_LOAD_FIT) += spl_fit.o
 obj-$(CONFIG_SPL_NOR_SUPPORT) += spl_nor.o
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += spl_ymodem.o
+ifndef CONFIG_SPL_UBI
 obj-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o
 obj-$(CONFIG_SPL_ONENAND_SUPPORT) += spl_onenand.o
+endif
+obj-$(CONFIG_SPL_UBI) += spl_ubi.o
 obj-$(CONFIG_SPL_NET_SUPPORT) += spl_net.o
 obj-$(CONFIG_SPL_MMC_SUPPORT) += spl_mmc.o
 obj-$(CONFIG_SPL_USB_SUPPORT) += spl_usb.o

common/spl/spl.c

@@ -330,6 +330,11 @@ static int spl_load_image(u32 boot_device)
 	case BOOT_DEVICE_MMC2_2:
 		return spl_mmc_load_image(boot_device);
 #endif
+#ifdef CONFIG_SPL_UBI
+	case BOOT_DEVICE_NAND:
+	case BOOT_DEVICE_ONENAND:
+		return spl_ubi_load_image(boot_device);
+#else
 #ifdef CONFIG_SPL_NAND_SUPPORT
 	case BOOT_DEVICE_NAND:
 		return spl_nand_load_image();
@@ -338,6 +343,7 @@ static int spl_load_image(u32 boot_device)
 	case BOOT_DEVICE_ONENAND:
 		return spl_onenand_load_image();
 #endif
+#endif
 #ifdef CONFIG_SPL_NOR_SUPPORT
 	case BOOT_DEVICE_NOR:
 		return spl_nor_load_image();

common/spl/spl_ubi.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2016
+ * Ladislav Michl <ladis@linux-mips.org>
+ *
+ * SPDX-License-Identifier: GPL 2.0+ BSD-3-Clause
+ */
+
+#include <common.h>
+#include <config.h>
+#include <nand.h>
+#include <onenand_uboot.h>
+#include <ubispl.h>
+#include <spl.h>
+
+int spl_ubi_load_image(u32 boot_device)
+{
+	struct image_header *header;
+	struct ubispl_info info;
+	struct ubispl_load volumes[2];
+	int ret = 1;
+
+	switch (boot_device) {
+#ifdef CONFIG_SPL_NAND_SUPPORT
+	case BOOT_DEVICE_NAND:
+		nand_init();
+		info.read = nand_spl_read_block;
+		info.peb_size = CONFIG_SYS_NAND_BLOCK_SIZE;
+		break;
+#endif
+#ifdef CONFIG_SPL_ONENAND_SUPPORT
+	case BOOT_DEVICE_ONENAND:
+		info.read = onenand_spl_read_block;
+		info.peb_size = CONFIG_SYS_ONENAND_BLOCK_SIZE;
+		break;
+#endif
+	default:
+		goto out;
+	}
+	info.ubi = (struct ubi_scan_info *)CONFIG_SPL_UBI_INFO_ADDR;
+	info.fastmap = 1;
+
+	info.peb_offset = CONFIG_SPL_UBI_PEB_OFFSET;
+	info.vid_offset = CONFIG_SPL_UBI_VID_OFFSET;
+	info.leb_start = CONFIG_SPL_UBI_LEB_START;
+	info.peb_count = CONFIG_SPL_UBI_MAX_PEBS - info.peb_offset;
+
+#ifdef CONFIG_SPL_OS_BOOT
+	if (!spl_start_uboot()) {
+		volumes[0].vol_id = CONFIG_SPL_UBI_LOAD_KERNEL_ID;
+		volumes[0].load_addr = (void *)CONFIG_SYS_LOAD_ADDR;
+		volumes[1].vol_id = CONFIG_SPL_UBI_LOAD_ARGS_ID;
+		volumes[1].load_addr = (void *)CONFIG_SYS_SPL_ARGS_ADDR;
+
+		ret = ubispl_load_volumes(&info, volumes, 2);
+		if (!ret) {
+			header = (struct image_header *)volumes[0].load_addr;
+			spl_parse_image_header(header);
+			puts("Linux loaded.\n");
+			goto out;
+		}
+		puts("Loading Linux failed, falling back to U-Boot.\n");
+	}
+#endif
+	header = (struct image_header *)
+		(CONFIG_SYS_TEXT_BASE - sizeof(struct image_header));
+	volumes[0].vol_id = CONFIG_SPL_UBI_LOAD_MONITOR_ID;
+	volumes[0].load_addr = (void *)header;
+
+	ret = ubispl_load_volumes(&info, volumes, 1);
+	if (!ret)
+		spl_parse_image_header(header);
+out:
+#ifdef CONFIG_SPL_NAND_SUPPORT
+	if (boot_device == BOOT_DEVICE_NAND)
+		nand_deselect();
+#endif
+	return ret;
+}

include/spl.h

@@ -71,6 +71,7 @@ void spl_set_header_raw_uboot(void);
 int spl_parse_image_header(const struct image_header *header);
 void spl_board_prepare_for_linux(void);
 void spl_board_prepare_for_boot(void);
+int spl_board_ubi_load_image(u32 boot_device);
 void __noreturn jump_to_image_linux(void *arg);
 int spl_start_uboot(void);
 void spl_display_print(void);
@@ -84,6 +85,9 @@ int spl_onenand_load_image(void);
 /* NOR SPL functions */
 int spl_nor_load_image(void);
 
+/* UBI SPL functions */
+int spl_ubi_load_image(u32 boot_device);
+
 /* MMC SPL functions */
 int spl_mmc_load_image(u32 boot_device);