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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2022, Linaro Limited
*/
#define LOG_CATEGORY UCLASS_FWU_MDATA
#include <blk.h>
#include <dm.h>
#include <efi_loader.h>
#include <fwu.h>
#include <fwu_mdata.h>
#include <log.h>
#include <memalign.h>
#include <part.h>
#include <part_efi.h>
#include <dm/device-internal.h>
#include <linux/errno.h>
#include <linux/types.h>
enum {
MDATA_READ = 1,
MDATA_WRITE,
};
static uint g_mdata_part[2]; /* = {0, 0} to check against uninit parts */
static int gpt_get_mdata_partitions(struct blk_desc *desc)
{
int i;
u32 nparts;
efi_guid_t part_type_guid;
struct disk_partition info;
const efi_guid_t fwu_mdata_guid = FWU_MDATA_GUID;
/* if primary and secondary partitions already found */
if (g_mdata_part[0] && g_mdata_part[1])
return 0;
nparts = 0;
for (i = 1; i < MAX_SEARCH_PARTITIONS && nparts < 2; i++) {
if (part_get_info(desc, i, &info))
continue;
uuid_str_to_bin(info.type_guid, part_type_guid.b,
UUID_STR_FORMAT_GUID);
if (!guidcmp(&fwu_mdata_guid, &part_type_guid))
g_mdata_part[nparts++] = i;
}
if (nparts != 2) {
log_debug("Expect two copies of the FWU metadata instead of %d\n",
nparts);
g_mdata_part[0] = 0;
g_mdata_part[1] = 0;
return -EINVAL;
}
return 0;
}
static int gpt_get_mdata_disk_part(struct blk_desc *desc,
struct disk_partition *info,
u32 part_num)
{
int ret;
char *mdata_guid_str = "8a7a84a0-8387-40f6-ab41-a8b9a5a60d23";
ret = part_get_info(desc, part_num, info);
if (ret < 0) {
log_debug("Unable to get the partition info for the FWU metadata part %d\n",
part_num);
return -ENOENT;
}
/* Check that it is indeed the FWU metadata partition */
if (!strncmp(info->type_guid, mdata_guid_str, UUID_STR_LEN))
return 0;
return -ENOENT;
}
static int gpt_read_write_mdata(struct blk_desc *desc,
struct fwu_mdata *mdata,
u8 access, u32 part_num)
{
int ret;
u32 len, blk_start, blkcnt;
struct disk_partition info;
ALLOC_CACHE_ALIGN_BUFFER_PAD(struct fwu_mdata, mdata_aligned, 1,
desc->blksz);
if (!mdata)
return -ENOMEM;
ret = gpt_get_mdata_disk_part(desc, &info, part_num);
if (ret < 0) {
printf("Unable to get the FWU metadata partition\n");
return -ENOENT;
}
len = sizeof(*mdata);
blkcnt = BLOCK_CNT(len, desc);
if (blkcnt > info.size) {
log_debug("Block count exceeds FWU metadata partition size\n");
return -ERANGE;
}
blk_start = info.start;
if (access == MDATA_READ) {
if (blk_dread(desc, blk_start, blkcnt, mdata_aligned) != blkcnt) {
log_debug("Error reading FWU metadata from the device\n");
return -EIO;
}
memcpy(mdata, mdata_aligned, sizeof(struct fwu_mdata));
} else {
if (blk_dwrite(desc, blk_start, blkcnt, mdata) != blkcnt) {
log_debug("Error writing FWU metadata to the device\n");
return -EIO;
}
}
return 0;
}
static int fwu_get_mdata_device(struct udevice *dev, struct udevice **mdata_dev)
{
u32 phandle;
int ret, size;
struct udevice *parent;
const fdt32_t *phandle_p = NULL;
phandle_p = dev_read_prop(dev, "fwu-mdata-store", &size);
if (!phandle_p) {
log_debug("fwu-mdata-store property not found\n");
return -ENOENT;
}
phandle = fdt32_to_cpu(*phandle_p);
ret = device_get_global_by_ofnode(ofnode_get_by_phandle(phandle),
&parent);
if (ret)
return ret;
return blk_get_from_parent(parent, mdata_dev);
}
static int fwu_mdata_gpt_blk_probe(struct udevice *dev)
{
int ret;
struct udevice *mdata_dev = NULL;
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
ret = fwu_get_mdata_device(dev, &mdata_dev);
if (ret)
return ret;
priv->blk_dev = mdata_dev;
return 0;
}
static int fwu_gpt_read_mdata(struct udevice *dev, struct fwu_mdata *mdata,
bool primary)
{
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
int ret;
ret = gpt_get_mdata_partitions(desc);
if (ret < 0) {
log_debug("Error getting the FWU metadata partitions\n");
return -ENOENT;
}
return gpt_read_write_mdata(desc, mdata, MDATA_READ,
primary ? g_mdata_part[0] : g_mdata_part[1]);
}
static int fwu_gpt_write_mdata(struct udevice *dev, struct fwu_mdata *mdata,
bool primary)
{
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
int ret;
ret = gpt_get_mdata_partitions(desc);
if (ret < 0) {
log_debug("Error getting the FWU metadata partitions\n");
return -ENOENT;
}
return gpt_read_write_mdata(desc, mdata, MDATA_WRITE,
primary ? g_mdata_part[0] : g_mdata_part[1]);
}
static const struct fwu_mdata_ops fwu_gpt_blk_ops = {
.read_mdata = fwu_gpt_read_mdata,
.write_mdata = fwu_gpt_write_mdata,
};
static const struct udevice_id fwu_mdata_ids[] = {
{ .compatible = "u-boot,fwu-mdata-gpt" },
{ }
};
U_BOOT_DRIVER(fwu_mdata_gpt_blk) = {
.name = "fwu-mdata-gpt-blk",
.id = UCLASS_FWU_MDATA,
.of_match = fwu_mdata_ids,
.ops = &fwu_gpt_blk_ops,
.probe = fwu_mdata_gpt_blk_probe,
.priv_auto = sizeof(struct fwu_mdata_gpt_blk_priv),
};
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