fdt_support: add partitions fixup in mtd node
Allow overwriting 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>
This commit is contained in:
Anatolij Gustschin
Wolfgang Denk
parent
d611295032
commit
3c950e2ebf
@ -776,7 +776,7 @@ static int device_del(struct mtd_device *dev)
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* @param num device number
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* @return NULL if requested device does not exist
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*/
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static struct mtd_device* device_find(u8 type, u8 num)
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struct mtd_device *device_find(u8 type, u8 num)
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{
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struct list_head *entry;
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struct mtd_device *dev_tmp;
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@ -757,3 +757,222 @@ int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size)
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return -1;
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}
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#endif
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#ifdef CONFIG_FDT_FIXUP_PARTITIONS
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#include <jffs2/load_kernel.h>
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#include <mtd_node.h>
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struct reg_cell {
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unsigned int r0;
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unsigned int r1;
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};
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int fdt_del_subnodes(const void *blob, int parent_offset)
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{
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int off, ndepth;
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int ret;
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for (ndepth = 0, off = fdt_next_node(blob, parent_offset, &ndepth);
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(off >= 0) && (ndepth > 0);
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off = fdt_next_node(blob, off, &ndepth)) {
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if (ndepth == 1) {
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debug("delete %s: offset: %x\n",
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fdt_get_name(blob, off, 0), off);
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ret = fdt_del_node((void *)blob, off);
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if (ret < 0) {
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printf("Can't delete node: %s\n",
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fdt_strerror(ret));
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return ret;
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} else {
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ndepth = 0;
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off = parent_offset;
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}
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}
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}
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return 0;
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}
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int fdt_increase_size(void *fdt, int add_len)
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{
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int newlen;
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newlen = fdt_totalsize(fdt) + add_len;
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/* Open in place with a new len */
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return fdt_open_into(fdt, fdt, newlen);
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}
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int fdt_del_partitions(void *blob, int parent_offset)
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{
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const void *prop;
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int ndepth = 0;
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int off;
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int ret;
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off = fdt_next_node(blob, parent_offset, &ndepth);
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if (off > 0 && ndepth == 1) {
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prop = fdt_getprop(blob, off, "label", NULL);
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if (prop == NULL) {
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/*
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* Could not find label property, nand {}; node?
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* Check subnode, delete partitions there if any.
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*/
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return fdt_del_partitions(blob, off);
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} else {
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ret = fdt_del_subnodes(blob, parent_offset);
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if (ret < 0) {
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printf("Can't remove subnodes: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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}
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}
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return 0;
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}
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int fdt_node_set_part_info(void *blob, int parent_offset,
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struct mtd_device *dev)
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{
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struct list_head *pentry;
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struct part_info *part;
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struct reg_cell cell;
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int off, ndepth = 0;
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int part_num, ret;
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char buf[64];
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ret = fdt_del_partitions(blob, parent_offset);
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if (ret < 0)
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return ret;
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/*
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* Check if it is nand {}; subnode, adjust
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* the offset in this case
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*/
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off = fdt_next_node(blob, parent_offset, &ndepth);
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if (off > 0 && ndepth == 1)
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parent_offset = off;
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part_num = 0;
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list_for_each_prev(pentry, &dev->parts) {
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int newoff;
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part = list_entry(pentry, struct part_info, link);
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debug("%2d: %-20s0x%08x\t0x%08x\t%d\n",
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part_num, part->name, part->size,
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part->offset, part->mask_flags);
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sprintf(buf, "partition@%x", part->offset);
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add_sub:
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ret = fdt_add_subnode(blob, parent_offset, buf);
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if (ret == -FDT_ERR_NOSPACE) {
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ret = fdt_increase_size(blob, 512);
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if (!ret)
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goto add_sub;
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else
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goto err_size;
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} else if (ret < 0) {
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printf("Can't add partition node: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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newoff = ret;
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/* Check MTD_WRITEABLE_CMD flag */
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if (part->mask_flags & 1) {
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add_ro:
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ret = fdt_setprop(blob, newoff, "read_only", NULL, 0);
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if (ret == -FDT_ERR_NOSPACE) {
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ret = fdt_increase_size(blob, 512);
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if (!ret)
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goto add_ro;
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else
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goto err_size;
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} else if (ret < 0)
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goto err_prop;
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}
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cell.r0 = cpu_to_fdt32(part->offset);
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cell.r1 = cpu_to_fdt32(part->size);
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add_reg:
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ret = fdt_setprop(blob, newoff, "reg", &cell, sizeof(cell));
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if (ret == -FDT_ERR_NOSPACE) {
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ret = fdt_increase_size(blob, 512);
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if (!ret)
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goto add_reg;
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else
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goto err_size;
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} else if (ret < 0)
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goto err_prop;
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add_label:
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ret = fdt_setprop_string(blob, newoff, "label", part->name);
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if (ret == -FDT_ERR_NOSPACE) {
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ret = fdt_increase_size(blob, 512);
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if (!ret)
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goto add_label;
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else
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goto err_size;
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} else if (ret < 0)
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goto err_prop;
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part_num++;
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}
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return 0;
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err_size:
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printf("Can't increase blob size: %s\n", fdt_strerror(ret));
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return ret;
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err_prop:
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printf("Can't add property: %s\n", fdt_strerror(ret));
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return ret;
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}
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/*
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* Update partitions in nor/nand nodes using info from
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* mtdparts environment variable. The nodes to update are
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* specified by node_info structure which contains mtd device
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* type and compatible string: E. g. the board code in
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* ft_board_setup() could use:
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*
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* struct node_info nodes[] = {
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* { "fsl,mpc5121-nfc", MTD_DEV_TYPE_NAND, },
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* { "cfi-flash", MTD_DEV_TYPE_NOR, },
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* };
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*
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* fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
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*/
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void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
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{
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struct node_info *ni = node_info;
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struct mtd_device *dev;
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char *parts;
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int i, idx;
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int noff;
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parts = getenv("mtdparts");
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if (!parts)
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return;
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if (mtdparts_init() != 0)
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return;
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for (i = 0; i < node_info_size; i++) {
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idx = 0;
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noff = fdt_node_offset_by_compatible(blob, -1, ni[i].compat);
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while (noff != -FDT_ERR_NOTFOUND) {
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debug("%s: %s, mtd dev type %d\n",
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fdt_get_name(blob, noff, 0),
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ni[i].compat, ni[i].type);
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dev = device_find(ni[i].type, idx++);
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if (dev) {
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if (fdt_node_set_part_info(blob, noff, dev))
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return; /* return on error */
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}
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/* Jump to next flash node */
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noff = fdt_node_offset_by_compatible(blob, noff,
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ni[i].compat);
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}
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}
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}
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#endif
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@ -81,5 +81,7 @@ int fdt_resize(void *blob);
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int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size);
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void fdt_fixup_mtdparts(void *fdt, void *node_info, int node_info_size);
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#endif /* ifdef CONFIG_OF_LIBFDT */
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#endif /* ifndef __FDT_SUPPORT_H */
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@ -78,5 +78,6 @@ struct mtdids {
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extern int mtdparts_init(void);
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extern int find_dev_and_part(const char *id, struct mtd_device **dev,
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u8 *part_num, struct part_info **part);
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extern struct mtd_device *device_find(u8 type, u8 num);
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#endif /* load_kernel_h */
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11
include/mtd_node.h
Normal file
11
include/mtd_node.h
Normal file
@ -0,0 +1,11 @@
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#ifndef _NODE_INFO
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#define _NODE_INFO
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/*
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* Info we use to search for a flash node in DTB.
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*/
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struct node_info {
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const char *compat; /* compatible string */
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int type; /* mtd flash type */
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};
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#endif
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