Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 323 insertions, 0 deletions

diff --git a/drivers/mtd/parsers/redboot.c b/drivers/mtd/parsers/redboot.c
new file mode 100644
index 0000000000..a16b42a885
--- /dev/null
+++ b/drivers/mtd/parsers/redboot.c
@@ -0,0 +1,323 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Parse RedBoot-style Flash Image System (FIS) tables and
+ * produce a Linux partition array to match.
+ *
+ * Copyright © 2001      Red Hat UK Limited
+ * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+#include <linux/of.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/module.h>
+
+struct fis_image_desc {
+	unsigned char name[16];      // Null terminated name
+	u32	  flash_base;    // Address within FLASH of image
+	u32	  mem_base;      // Address in memory where it executes
+	u32	  size;          // Length of image
+	u32	  entry_point;   // Execution entry point
+	u32	  data_length;   // Length of actual data
+	unsigned char _pad[256 - (16 + 7 * sizeof(u32))];
+	u32	  desc_cksum;    // Checksum over image descriptor
+	u32	  file_cksum;    // Checksum over image data
+};
+
+struct fis_list {
+	struct fis_image_desc *img;
+	struct fis_list *next;
+};
+
+static int directory = CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK;
+module_param(directory, int, 0);
+
+static inline int redboot_checksum(struct fis_image_desc *img)
+{
+	/* RedBoot doesn't actually write the desc_cksum field yet AFAICT */
+	return 1;
+}
+
+static void parse_redboot_of(struct mtd_info *master)
+{
+	struct device_node *np;
+	struct device_node *npart;
+	u32 dirblock;
+	int ret;
+
+	np = mtd_get_of_node(master);
+	if (!np)
+		return;
+
+	npart = of_get_child_by_name(np, "partitions");
+	if (!npart)
+		return;
+
+	ret = of_property_read_u32(npart, "fis-index-block", &dirblock);
+	of_node_put(npart);
+	if (ret)
+		return;
+
+	/*
+	 * Assign the block found in the device tree to the local
+	 * directory block pointer.
+	 */
+	directory = dirblock;
+}
+
+static int parse_redboot_partitions(struct mtd_info *master,
+				    const struct mtd_partition **pparts,
+				    struct mtd_part_parser_data *data)
+{
+	int nrparts = 0;
+	struct fis_image_desc *buf;
+	struct mtd_partition *parts;
+	struct fis_list *fl = NULL, *tmp_fl;
+	int ret, i;
+	size_t retlen;
+	char *names;
+	char *nullname;
+	int namelen = 0;
+	int nulllen = 0;
+	int numslots;
+	unsigned long offset;
+#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
+	static char nullstring[] = "unallocated";
+#endif
+
+	parse_redboot_of(master);
+
+	if (directory < 0) {
+		offset = master->size + directory * master->erasesize;
+		while (mtd_block_isbad(master, offset)) {
+			if (!offset) {
+nogood:
+				pr_notice("Failed to find a non-bad block to check for RedBoot partition table\n");
+				return -EIO;
+			}
+			offset -= master->erasesize;
+		}
+	} else {
+		offset = directory * master->erasesize;
+		while (mtd_block_isbad(master, offset)) {
+			offset += master->erasesize;
+			if (offset == master->size)
+				goto nogood;
+		}
+	}
+	buf = vmalloc(master->erasesize);
+
+	if (!buf)
+		return -ENOMEM;
+
+	pr_notice("Searching for RedBoot partition table in %s at offset 0x%lx\n",
+		  master->name, offset);
+
+	ret = mtd_read(master, offset, master->erasesize, &retlen,
+		       (void *)buf);
+
+	if (ret)
+		goto out;
+
+	if (retlen != master->erasesize) {
+		ret = -EIO;
+		goto out;
+	}
+
+	numslots = (master->erasesize / sizeof(struct fis_image_desc));
+	for (i = 0; i < numslots; i++) {
+		if (!memcmp(buf[i].name, "FIS directory", 14)) {
+			/* This is apparently the FIS directory entry for the
+			 * FIS directory itself.  The FIS directory size is
+			 * one erase block; if the buf[i].size field is
+			 * swab32(erasesize) then we know we are looking at
+			 * a byte swapped FIS directory - swap all the entries!
+			 * (NOTE: this is 'size' not 'data_length'; size is
+			 * the full size of the entry.)
+			 */
+
+			/* RedBoot can combine the FIS directory and
+			   config partitions into a single eraseblock;
+			   we assume wrong-endian if either the swapped
+			   'size' matches the eraseblock size precisely,
+			   or if the swapped size actually fits in an
+			   eraseblock while the unswapped size doesn't. */
+			if (swab32(buf[i].size) == master->erasesize ||
+			    (buf[i].size > master->erasesize
+			     && swab32(buf[i].size) < master->erasesize)) {
+				int j;
+				/* Update numslots based on actual FIS directory size */
+				numslots = swab32(buf[i].size) / sizeof(struct fis_image_desc);
+				for (j = 0; j < numslots; ++j) {
+					/* A single 0xff denotes a deleted entry.
+					 * Two of them in a row is the end of the table.
+					 */
+					if (buf[j].name[0] == 0xff) {
+						if (buf[j].name[1] == 0xff) {
+							break;
+						} else {
+							continue;
+						}
+					}
+
+					/* The unsigned long fields were written with the
+					 * wrong byte sex, name and pad have no byte sex.
+					 */
+					swab32s(&buf[j].flash_base);
+					swab32s(&buf[j].mem_base);
+					swab32s(&buf[j].size);
+					swab32s(&buf[j].entry_point);
+					swab32s(&buf[j].data_length);
+					swab32s(&buf[j].desc_cksum);
+					swab32s(&buf[j].file_cksum);
+				}
+			} else if (buf[i].size < master->erasesize) {
+				/* Update numslots based on actual FIS directory size */
+				numslots = buf[i].size / sizeof(struct fis_image_desc);
+			}
+			break;
+		}
+	}
+	if (i == numslots) {
+		/* Didn't find it */
+		pr_notice("No RedBoot partition table detected in %s\n",
+			  master->name);
+		ret = 0;
+		goto out;
+	}
+
+	for (i = 0; i < numslots; i++) {
+		struct fis_list *new_fl, **prev;
+
+		if (buf[i].name[0] == 0xff) {
+			if (buf[i].name[1] == 0xff) {
+				break;
+			} else {
+				continue;
+			}
+		}
+		if (!redboot_checksum(&buf[i]))
+			break;
+
+		new_fl = kmalloc(sizeof(struct fis_list), GFP_KERNEL);
+		namelen += strlen(buf[i].name) + 1;
+		if (!new_fl) {
+			ret = -ENOMEM;
+			goto out;
+		}
+		new_fl->img = &buf[i];
+		if (data && data->origin)
+			buf[i].flash_base -= data->origin;
+		else
+			buf[i].flash_base &= master->size - 1;
+
+		/* I'm sure the JFFS2 code has done me permanent damage.
+		 * I now think the following is _normal_
+		 */
+		prev = &fl;
+		while (*prev && (*prev)->img->flash_base < new_fl->img->flash_base)
+			prev = &(*prev)->next;
+		new_fl->next = *prev;
+		*prev = new_fl;
+
+		nrparts++;
+	}
+#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
+	if (fl->img->flash_base) {
+		nrparts++;
+		nulllen = sizeof(nullstring);
+	}
+
+	for (tmp_fl = fl; tmp_fl->next; tmp_fl = tmp_fl->next) {
+		if (tmp_fl->img->flash_base + tmp_fl->img->size + master->erasesize <= tmp_fl->next->img->flash_base) {
+			nrparts++;
+			nulllen = sizeof(nullstring);
+		}
+	}
+#endif
+	parts = kzalloc(sizeof(*parts) * nrparts + nulllen + namelen, GFP_KERNEL);
+
+	if (!parts) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	nullname = (char *)&parts[nrparts];
+#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
+	if (nulllen > 0)
+		strcpy(nullname, nullstring);
+#endif
+	names = nullname + nulllen;
+
+	i = 0;
+
+#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
+	if (fl->img->flash_base) {
+		parts[0].name = nullname;
+		parts[0].size = fl->img->flash_base;
+		parts[0].offset = 0;
+		i++;
+	}
+#endif
+	for ( ; i < nrparts; i++) {
+		parts[i].size = fl->img->size;
+		parts[i].offset = fl->img->flash_base;
+		parts[i].name = names;
+
+		strcpy(names, fl->img->name);
+#ifdef CONFIG_MTD_REDBOOT_PARTS_READONLY
+		if (!memcmp(names, "RedBoot", 8) ||
+		    !memcmp(names, "RedBoot config", 15) ||
+		    !memcmp(names, "FIS directory", 14)) {
+			parts[i].mask_flags = MTD_WRITEABLE;
+		}
+#endif
+		names += strlen(names) + 1;
+
+#ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
+		if (fl->next && fl->img->flash_base + fl->img->size + master->erasesize <= fl->next->img->flash_base) {
+			i++;
+			parts[i].offset = parts[i - 1].size + parts[i - 1].offset;
+			parts[i].size = fl->next->img->flash_base - parts[i].offset;
+			parts[i].name = nullname;
+		}
+#endif
+		tmp_fl = fl;
+		fl = fl->next;
+		kfree(tmp_fl);
+	}
+	ret = nrparts;
+	*pparts = parts;
+ out:
+	while (fl) {
+		struct fis_list *old = fl;
+
+		fl = fl->next;
+		kfree(old);
+	}
+	vfree(buf);
+	return ret;
+}
+
+static const struct of_device_id mtd_parser_redboot_of_match_table[] = {
+	{ .compatible = "redboot-fis" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtd_parser_redboot_of_match_table);
+
+static struct mtd_part_parser redboot_parser = {
+	.parse_fn = parse_redboot_partitions,
+	.name = "RedBoot",
+	.of_match_table = mtd_parser_redboot_of_match_table,
+};
+module_mtd_part_parser(redboot_parser);
+
+/* mtd parsers will request the module by parser name */
+MODULE_ALIAS("RedBoot");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Parsing code for RedBoot Flash Image System (FIS) tables");