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mmc: block: attach partitions fwnode if found in mmc-card

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Attach partitions fwnode if found in mmc-card and register disk with it.

This permits block partition to reference the node and register a
partition table defined in DT for the special case for embedded device
that doesn't have a partition table flashed but have an hardcoded
partition table passed from the system.

JEDEC BOOT partition boot0/boot1 are supported but in DT we refer with
the JEDEC name of boot1 and boot2 to better adhere to documentation.

Also JEDEC GP partition gp0/1/2/3 are supported but in DT we refer with
the JEDEC name of gp1/2/3/4 to better adhere to documentration.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241002221306.4403-5-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christian Marangi 2024-10-03 00:11:44 +02:00 • committed by Jens Axboe
parent 9dfd9ea93a
commit 3ec7cb11bb
1 changed files with 54 additions and 1 deletions
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55
drivers/mmc/core/block.c
View file

@ -2501,6 +2501,56 @@ static inline int mmc_blk_readonly(struct mmc_card *card)
!(card->csd.cmdclass & CCC_BLOCK_WRITE);
}
/*
* Search for a declared partitions node for the disk in mmc-card related node.
*
* This is to permit support for partition table defined in DT in special case
* where a partition table is not written in the disk and is expected to be
* passed from the running system.
*
* For the user disk, "partitions" node is searched.
* For the special HW disk, "partitions-" node with the appended name is used
* following this conversion table (to adhere to JEDEC naming)
* - boot0 -> partitions-boot1
* - boot1 -> partitions-boot2
* - gp0 -> partitions-gp1
* - gp1 -> partitions-gp2
* - gp2 -> partitions-gp3
* - gp3 -> partitions-gp4
*/
static struct fwnode_handle *mmc_blk_get_partitions_node(struct device *mmc_dev,
const char *subname)
{
const char *node_name = "partitions";
if (subname) {
mmc_dev = mmc_dev->parent;
/*
* Check if we are allocating a BOOT disk boot0/1 disk.
* In DT we use the JEDEC naming boot1/2.
*/
if (!strcmp(subname, "boot0"))
node_name = "partitions-boot1";
if (!strcmp(subname, "boot1"))
node_name = "partitions-boot2";
/*
* Check if we are allocating a GP disk gp0/1/2/3 disk.
* In DT we use the JEDEC naming gp1/2/3/4.
*/
if (!strcmp(subname, "gp0"))
node_name = "partitions-gp1";
if (!strcmp(subname, "gp1"))
node_name = "partitions-gp2";
if (!strcmp(subname, "gp2"))
node_name = "partitions-gp3";
if (!strcmp(subname, "gp3"))
node_name = "partitions-gp4";
}
return device_get_named_child_node(mmc_dev, node_name);
}
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
struct device *parent,
sector_t size,
@ -2509,6 +2559,7 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
int area_type,
unsigned int part_type)
{
struct fwnode_handle *disk_fwnode;
struct mmc_blk_data *md;
int devidx, ret;
char cap_str[10];
@ -2610,7 +2661,9 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
/* used in ->open, must be set before add_disk: */
if (area_type == MMC_BLK_DATA_AREA_MAIN)
dev_set_drvdata(&card->dev, md);
ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
disk_fwnode = mmc_blk_get_partitions_node(parent, subname);
ret = add_disk_fwnode(md->parent, md->disk, mmc_disk_attr_groups,
disk_fwnode);
if (ret)
goto err_put_disk;
return md;