Allow overriding defined partitions in the device tree blob using partition info defined in the 'mtdparts' environment variable.
Signed-off-by: Anatolij Gustschin agust@denx.de Cc: Gerald Van Baren vanbaren@cideas.com --- common/cmd_mtdparts.c | 2 +- common/fdt_support.c | 214 +++++++++++++++++++++++++++++++++++++++++++ include/fdt_support.h | 2 + include/jffs2/load_kernel.h | 1 + include/mtd_node.h | 11 ++ 5 files changed, 229 insertions(+), 1 deletions(-) create mode 100644 include/mtd_node.h
diff --git a/common/cmd_mtdparts.c b/common/cmd_mtdparts.c index b375fea..80c548b 100644 --- a/common/cmd_mtdparts.c +++ b/common/cmd_mtdparts.c @@ -776,7 +776,7 @@ static int device_del(struct mtd_device *dev) * @param num device number * @return NULL if requested device does not exist */ -static struct mtd_device* device_find(u8 type, u8 num) +struct mtd_device *device_find(u8 type, u8 num) { struct list_head *entry; struct mtd_device *dev_tmp; diff --git a/common/fdt_support.c b/common/fdt_support.c index f89a3ee..b6abf38 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -757,3 +757,217 @@ int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size) return -1; } #endif + +#ifdef CONFIG_FDT_FIXUP_PARTITIONS +#include <jffs2/load_kernel.h> +#include <mtd_node.h> + +struct reg_cell { + unsigned int r0; + unsigned int r1; +}; + +int fdt_del_subnodes(const void *blob, int parent_offset) +{ + int off, ndepth; + int ret; + + for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth); + (off >= 0) && (ndepth > 0); + off = fdt_next_node(blob, off, &ndepth)) { + if (ndepth == 1) { + debug("delete %s: offset: %x\n", + fdt_get_name(blob, off, 0), off); + ret = fdt_del_node((void *)blob, off); + if (ret < 0) { + printf("Can't delete node: %s\n", + fdt_strerror(ret)); + return ret; + } else { + ndepth = 0; + off = parent_offset; + } + } + } + return 0; +} + +int fdt_increase_size(void *fdt, int add_len) +{ + int newlen; + + newlen = fdt_totalsize(fdt) + add_len; + + /* Open in place with a new len */ + return fdt_open_into(fdt, fdt, newlen); +} + +int fdt_del_partitions(void *blob, int parent_offset) +{ + const void *prop; + int ndepth = 0; + int off; + int ret; + + off = fdt_next_node(blob, parent_offset, &ndepth); + if (off > 0 && ndepth == 1) { + prop = fdt_getprop(blob, off, "label", NULL); + if (prop == NULL) { + /* + * Could not find label property, nand {}; node? + * Check subnode, delete partitions there if any. + */ + return fdt_del_partitions(blob, off); + } else { + ret = fdt_del_subnodes(blob, parent_offset); + if (ret < 0) { + printf("Can't remove subnodes: %s\n", + fdt_strerror(ret)); + return ret; + } + } + } + return 0; +} + +int fdt_node_set_part_info(void *blob, int parent_offset, + struct mtd_device *dev) +{ + struct list_head *pentry; + struct part_info *part; + struct reg_cell cell; + int off, ndepth = 0; + int part_num, ret; + char buf[64]; + + ret = fdt_del_partitions(blob, parent_offset); + if (ret < 0) + return ret; + + /* + * Check if it is nand {}; subnode, adjust + * the offset in this case + */ + off = fdt_next_node(blob, parent_offset, &ndepth); + if (off > 0 && ndepth == 1) + parent_offset = off; + + part_num = 0; + list_for_each_prev(pentry, &dev->parts) { + int newoff; + + part = list_entry(pentry, struct part_info, link); + + debug("%2d: %-20s0x%08x\t0x%08x\t%d\n", + part_num, part->name, part->size, + part->offset, part->mask_flags); + + sprintf(buf, "partition@%x", part->offset); +add_sub: + ret = fdt_add_subnode(blob, parent_offset, buf); + if (ret == -FDT_ERR_NOSPACE) { + ret = fdt_increase_size(blob, 512); + if (!ret) + goto add_sub; + else + goto err_size; + } else if (ret < 0) { + printf("Can't add partition node: %s\n", + fdt_strerror(ret)); + return ret; + } + newoff = ret; + + /* Check MTD_WRITEABLE_CMD flag */ + if (part->mask_flags & 1) { +add_ro: + ret = fdt_setprop(blob, newoff, "read_only", NULL, 0); + if (ret == -FDT_ERR_NOSPACE) { + ret = fdt_increase_size(blob, 512); + if (!ret) + goto add_ro; + else + goto err_size; + } else if (ret < 0) + goto err_prop; + } + + cell.r0 = cpu_to_fdt32(part->offset); + cell.r1 = cpu_to_fdt32(part->size); +add_reg: + ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell)); + if (ret == -FDT_ERR_NOSPACE) { + ret = fdt_increase_size(blob, 512); + if (!ret) + goto add_reg; + else + goto err_size; + } else if (ret < 0) + goto err_prop; + +add_label: + ret = fdt_setprop_string(blob, newoff, "label", part->name); + if (ret == -FDT_ERR_NOSPACE) { + ret = fdt_increase_size(blob, 512); + if (!ret) + goto add_label; + else + goto err_size; + } else if (ret < 0) + goto err_prop; + + part_num++; + } + return 0; +err_size: + printf("Can't increase blob size: %s\n", fdt_strerror(ret)); + return ret; +err_prop: + printf("Can't add property: %s\n", fdt_strerror(ret)); + return ret; +} + +/* + * Update partitions in nor/nand nodes using info from + * mtdparts environment variable. The nodes to update are + * specified by node_info structure which contains mtd device + * type and compatible string: E. g. the board code in + * ft_board_setup() could use: + * + * struct node_info nodes[] = { + * { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, }, + * { "cfi-flash", MTD_DEV_TYPE_NOR, }, + * }; + * + * fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes)); + */ +void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size) +{ + struct node_info *ni = node_info; + struct mtd_device *dev; + int i, idx; + int noff; + + if (mtdparts_init() != 0) + return; + + for (i = 0; i < node_info_size; i++) { + idx = 0; + noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat); + while (noff != -FDT_ERR_NOTFOUND) { + debug("%s: %s, mtd dev type %d\n", + fdt_get_name(blob, noff, 0), + ni[i].compat, ni[i].type); + dev = device_find(ni[i].type, idx++); + if (dev) { + if (fdt_node_set_part_info(blob, noff, dev)) + return; /* return on error */ + } + + /* Jump to next flash node */ + noff = fdt_node_offset_by_compatible(blob, noff, + ni[i].compat); + } + } +} +#endif diff --git a/include/fdt_support.h b/include/fdt_support.h index 0a9dd0d..a3d5f8c 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -81,5 +81,7 @@ int fdt_resize(void *blob);
int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size);
+void fdt_fixup_mtdparts(void *fdt, void *node_info, int node_info_size); + #endif /* ifdef CONFIG_OF_LIBFDT */ #endif /* ifndef __FDT_SUPPORT_H */ diff --git a/include/jffs2/load_kernel.h b/include/jffs2/load_kernel.h index 8b2720e..906eb3d 100644 --- a/include/jffs2/load_kernel.h +++ b/include/jffs2/load_kernel.h @@ -78,5 +78,6 @@ struct mtdids { extern int mtdparts_init(void); extern int find_dev_and_part(const char *id, struct mtd_device **dev, u8 *part_num, struct part_info **part); +extern struct mtd_device *device_find(u8 type, u8 num);
#endif /* load_kernel_h */ diff --git a/include/mtd_node.h b/include/mtd_node.h new file mode 100644 index 0000000..5aae085 --- /dev/null +++ b/include/mtd_node.h @@ -0,0 +1,11 @@ +#ifndef _NODE_INFO +#define _NODE_INFO + +/* + * Info we use to search for a flash node in DTB. + */ +struct node_info { + const char *compat; /* compatible string */ + int type; /* mtd flash type */ +}; +#endif