From: Sughosh Ganu sughosh.ganu@linaro.org
In the FWU Multi Bank Update feature, the information about the updatable images is stored as part of the metadata, on a separate region. Add a driver for reading from and writing to the metadata when the updatable images and the metadata are stored on a raw MTD region.
Signed-off-by: Sughosh Ganu sughosh.ganu@linaro.org Signed-off-by: Jassi Brar jaswinder.singh@linaro.org --- drivers/fwu-mdata/Kconfig | 8 + drivers/fwu-mdata/Makefile | 1 + drivers/fwu-mdata/fwu_mdata_mtd.c | 308 ++++++++++++++++++++++++++++++ 3 files changed, 317 insertions(+) create mode 100644 drivers/fwu-mdata/fwu_mdata_mtd.c
diff --git a/drivers/fwu-mdata/Kconfig b/drivers/fwu-mdata/Kconfig index d5edef19d6..a8fa9ad783 100644 --- a/drivers/fwu-mdata/Kconfig +++ b/drivers/fwu-mdata/Kconfig @@ -14,3 +14,11 @@ config FWU_MDATA_GPT_BLK help Enable support for accessing FWU Metadata on GPT partitioned block devices. + +config FWU_MDATA_MTD + bool "FWU Metadata access for non-GPT MTD devices" + depends on DM_FWU_MDATA && MTD + help + Enable support for accessing FWU Metadata on non-partitioned + (or non-GPT partitioned, e.g. partition nodes in devicetree) + MTD devices. diff --git a/drivers/fwu-mdata/Makefile b/drivers/fwu-mdata/Makefile index 313049f67a..58f8023f16 100644 --- a/drivers/fwu-mdata/Makefile +++ b/drivers/fwu-mdata/Makefile @@ -5,3 +5,4 @@
obj-$(CONFIG_DM_FWU_MDATA) += fwu-mdata-uclass.o obj-$(CONFIG_FWU_MDATA_GPT_BLK) += fwu_mdata_gpt_blk.o +obj-$(CONFIG_FWU_MDATA_MTD) += fwu_mdata_mtd.o diff --git a/drivers/fwu-mdata/fwu_mdata_mtd.c b/drivers/fwu-mdata/fwu_mdata_mtd.c new file mode 100644 index 0000000000..d543a419fd --- /dev/null +++ b/drivers/fwu-mdata/fwu_mdata_mtd.c @@ -0,0 +1,308 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2022, Linaro Limited + */ + +#include <efi_loader.h> +#include <fwu.h> +#include <fwu_mdata.h> +#include <malloc.h> +#include <memalign.h> +#include <spi.h> +#include <spi_flash.h> +#include <flash.h> + +#include <linux/errno.h> +#include <linux/types.h> +#include <u-boot/crc.h> + +struct fwu_mdata_mtd_priv { + struct mtd_info *mtd; + u32 pri_offset; + u32 sec_offset; +}; + +enum fwu_mtd_op { + FWU_MTD_READ, + FWU_MTD_WRITE, +}; + +static bool mtd_is_aligned_with_block_size(struct mtd_info *mtd, u64 size) +{ + return !do_div(size, mtd->erasesize); +} + +static int mtd_io_data(struct mtd_info *mtd, u32 offs, u32 size, void *data, + enum fwu_mtd_op op) +{ + struct mtd_oob_ops io_op ={}; + u64 lock_offs, lock_len; + size_t len; + void *buf; + int ret; + + if (!mtd_is_aligned_with_block_size(mtd, offs)) + return -EINVAL; + lock_offs = offs; + lock_len = round_up(size, mtd->erasesize); + + ret = mtd_unlock(mtd, lock_offs, lock_len); + if (ret && ret != -EOPNOTSUPP) + return ret; + + if (op == FWU_MTD_WRITE) { + struct erase_info erase_op = {}; + + /* This will expand erase size to align with the block size */ + erase_op.mtd = mtd; + erase_op.addr = lock_offs; + erase_op.len = lock_len; + erase_op.scrub = 0; + + ret = mtd_erase(mtd, &erase_op); + if (ret) + goto lock_out; + } + + /* Also, expand the write size to align with the write size */ + len = round_up(size, mtd->writesize); + + buf = memalign(ARCH_DMA_MINALIGN, len); + if (!buf) { + ret = -ENOMEM; + goto lock_out; + } + io_op.mode = MTD_OPS_AUTO_OOB; + io_op.len = len; + io_op.ooblen = 0; + io_op.datbuf = buf; + io_op.oobbuf = NULL; + + if (op == FWU_MTD_WRITE) { + memcpy(buf, data, size); + ret = mtd_write_oob(mtd, offs, &io_op); + } else { + ret = mtd_read_oob(mtd, offs, &io_op); + if (!ret) + memcpy(data, buf, size); + } + free(buf); + +lock_out: + mtd_lock(mtd, lock_offs, lock_len); + + return ret; +} + +static int fwu_mtd_load_mdata(struct mtd_info *mtd, struct fwu_mdata **mdata, + u32 offs, bool primary) +{ + size_t size = sizeof(struct fwu_mdata); + int ret; + + *mdata = malloc(size); + if (!*mdata) + return -ENOMEM; + + ret = mtd_io_data(mtd, offs, size, (void *)*mdata, FWU_MTD_READ); + if (ret >= 0) { + ret = fwu_verify_mdata(*mdata, primary); + if (ret < 0) { + free(*mdata); + *mdata = NULL; + } + } + + return ret; +} + +static int fwu_mtd_load_primary_mdata(struct fwu_mdata_mtd_priv *mtd_priv, + struct fwu_mdata **mdata) +{ + return fwu_mtd_load_mdata(mtd_priv->mtd, mdata, mtd_priv->pri_offset, true); +} + +static int fwu_mtd_load_secondary_mdata(struct fwu_mdata_mtd_priv *mtd_priv, + struct fwu_mdata **mdata) +{ + return fwu_mtd_load_mdata(mtd_priv->mtd, mdata, mtd_priv->sec_offset, false); +} + +static int fwu_mtd_save_primary_mdata(struct fwu_mdata_mtd_priv *mtd_priv, + struct fwu_mdata *mdata) +{ + return mtd_io_data(mtd_priv->mtd, mtd_priv->pri_offset, + sizeof(struct fwu_mdata), mdata, FWU_MTD_WRITE); +} + +static int fwu_mtd_save_secondary_mdata(struct fwu_mdata_mtd_priv *mtd_priv, + struct fwu_mdata *mdata) +{ + return mtd_io_data(mtd_priv->mtd, mtd_priv->sec_offset, + sizeof(struct fwu_mdata), mdata, FWU_MTD_WRITE); +} + +static int fwu_mtd_get_valid_mdata(struct fwu_mdata_mtd_priv *mtd_priv, + struct fwu_mdata **mdata) +{ + if (fwu_mtd_load_primary_mdata(mtd_priv, mdata) == 0) + return 0; + + log_err("Failed to load/verify primary mdata. Try secondary.\n"); + + if (fwu_mtd_load_secondary_mdata(mtd_priv, mdata) == 0) + return 0; + + log_err("Failed to load/verify secondary mdata.\n"); + + return -1; +} + +static int fwu_mtd_update_mdata(struct udevice *dev, struct fwu_mdata *mdata) +{ + struct fwu_mdata_mtd_priv *mtd_priv = dev_get_priv(dev); + int ret; + + /* Update mdata crc32 field */ + mdata->crc32 = crc32(0, (void *)&mdata->version, + sizeof(*mdata) - sizeof(u32)); + + /* First write the primary mdata */ + ret = fwu_mtd_save_primary_mdata(mtd_priv, mdata); + if (ret < 0) { + log_err("Failed to update the primary mdata.\n"); + return ret; + } + + /* And now the replica */ + ret = fwu_mtd_save_secondary_mdata(mtd_priv, mdata); + if (ret < 0) { + log_err("Failed to update the secondary mdata.\n"); + return ret; + } + + return 0; +} + +static int fwu_mtd_mdata_check(struct udevice *dev) +{ + struct fwu_mdata *primary = NULL, *secondary = NULL; + struct fwu_mdata_mtd_priv *mtd_priv = dev_get_priv(dev); + int ret; + + ret = fwu_mtd_load_primary_mdata(mtd_priv, &primary); + if (ret < 0) + log_err("Failed to read the primary mdata: %d\n", ret); + + ret = fwu_mtd_load_secondary_mdata(mtd_priv, &secondary); + if (ret < 0) + log_err("Failed to read the secondary mdata: %d\n", ret); + + if (primary && secondary) { + if (memcmp(primary, secondary, sizeof(struct fwu_mdata))) { + log_err("The primary and the secondary mdata are different\n"); + ret = -1; + } + } else if (primary) { + ret = fwu_mtd_save_secondary_mdata(mtd_priv, primary); + if (ret < 0) + log_err("Restoring secondary mdata partition failed\n"); + } else if (secondary) { + ret = fwu_mtd_save_primary_mdata(mtd_priv, secondary); + if (ret < 0) + log_err("Restoring primary mdata partition failed\n"); + } + + free(primary); + free(secondary); + return ret; +} + +static int fwu_mtd_get_mdata(struct udevice *dev, struct fwu_mdata **mdata) +{ + struct fwu_mdata_mtd_priv *mtd_priv = dev_get_priv(dev); + + return fwu_mtd_get_valid_mdata(mtd_priv, mdata); +} + +/** + * fwu_mdata_mtd_of_to_plat() - Translate from DT to fwu mdata device + */ +static int fwu_mdata_mtd_of_to_plat(struct udevice *dev) +{ + struct fwu_mdata_mtd_priv *mtd_priv = dev_get_priv(dev); + const fdt32_t *phandle_p = NULL; + struct udevice *mtd_dev; + struct mtd_info *mtd; + int ret, size; + u32 phandle; + + /* Find the FWU mdata storage device */ + phandle_p = ofnode_get_property(dev_ofnode(dev), + "fwu-mdata-store", &size); + if (!phandle_p) { + log_err("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), + &mtd_dev); + if (ret) + return ret; + + mtd_probe_devices(); + + mtd_for_each_device(mtd) { + if (mtd->dev == mtd_dev) { + mtd_priv->mtd = mtd; + log_debug("Found the FWU mdata mtd device %s\n", mtd->name); + break; + } + } + if (!mtd_priv->mtd) { + log_err("Failed to find mtd device by fwu-mdata-store\n"); + return -ENOENT; + } + + /* Get the offset of primary and seconday mdata */ + ret = ofnode_read_u32_index(dev_ofnode(dev), "mdata-offsets", 0, + &mtd_priv->pri_offset); + if (ret) + return ret; + ret = ofnode_read_u32_index(dev_ofnode(dev), "mdata-offsets", 1, + &mtd_priv->sec_offset); + if (ret) + return ret; + + return 0; +} + +static int fwu_mdata_mtd_probe(struct udevice *dev) +{ + /* Ensure the metadata can be read. */ + return fwu_mtd_mdata_check(dev); +} + +static struct fwu_mdata_ops fwu_mtd_ops = { + .mdata_check = fwu_mtd_mdata_check, + .get_mdata = fwu_mtd_get_mdata, + .update_mdata = fwu_mtd_update_mdata, +}; + +static const struct udevice_id fwu_mdata_ids[] = { + { .compatible = "u-boot,fwu-mdata-mtd" }, + { } +}; + +U_BOOT_DRIVER(fwu_mdata_mtd) = { + .name = "fwu-mdata-mtd", + .id = UCLASS_FWU_MDATA, + .of_match = fwu_mdata_ids, + .ops = &fwu_mtd_ops, + .probe = fwu_mdata_mtd_probe, + .of_to_plat = fwu_mdata_mtd_of_to_plat, + .priv_auto = sizeof(struct fwu_mdata_mtd_priv), +};