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fc153aa8d9
Similar to supporting nvmem-layouts on MTD devices, also allow referencing UBI and MMC devices in DT. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
78 lines
1.9 KiB
Diff
78 lines
1.9 KiB
Diff
From: Daniel Golle <daniel@makrotopia.org>
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Subject: ubi: auto-create ubiblock device for rootfs
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 42 insertions(+)
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--- a/drivers/mtd/ubi/block.c
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+++ b/drivers/mtd/ubi/block.c
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@@ -644,10 +644,47 @@ match_volume_desc(struct ubi_volume_info
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return true;
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}
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+#define UBIFS_NODE_MAGIC 0x06101831
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+static inline int ubi_vol_is_ubifs(struct ubi_volume_desc *desc)
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+{
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+ int ret;
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+ uint32_t magic_of, magic;
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+ ret = ubi_read(desc, 0, (char *)&magic_of, 0, 4);
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+ if (ret)
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+ return 0;
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+ magic = le32_to_cpu(magic_of);
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+ return magic == UBIFS_NODE_MAGIC;
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+}
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+
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+static void __init ubiblock_create_auto_rootfs(struct ubi_volume_info *vi)
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+{
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+ int ret, is_ubifs;
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+ struct ubi_volume_desc *desc;
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+
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+ if (strcmp(vi->name, "rootfs") &&
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+ strcmp(vi->name, "fit"))
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+ return;
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+
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+ desc = ubi_open_volume(vi->ubi_num, vi->vol_id, UBI_READONLY);
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+ if (IS_ERR(desc))
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+ return;
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+
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+ is_ubifs = ubi_vol_is_ubifs(desc);
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+ ubi_close_volume(desc);
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+ if (is_ubifs)
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+ return;
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+
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+ ret = ubiblock_create(vi);
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+ if (ret)
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+ pr_err("UBI error: block: can't add '%s' volume, err=%d\n",
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+ vi->name, ret);
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+}
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+
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static void
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ubiblock_create_from_param(struct ubi_volume_info *vi)
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{
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int i, ret = 0;
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+ bool got_param = false;
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struct ubiblock_param *p;
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/*
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@@ -660,6 +697,7 @@ ubiblock_create_from_param(struct ubi_vo
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if (!match_volume_desc(vi, p->name, p->ubi_num, p->vol_id))
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continue;
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+ got_param = true;
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ret = ubiblock_create(vi);
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if (ret) {
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pr_err(
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@@ -668,6 +706,10 @@ ubiblock_create_from_param(struct ubi_vo
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}
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break;
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}
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+
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+ /* auto-attach "rootfs" volume if existing and non-ubifs */
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+ if (!got_param && IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV))
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+ ubiblock_create_auto_rootfs(vi);
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}
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static int ubiblock_notify(struct notifier_block *nb,
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