From 803eb124e1a64e42888542c3444bfe6dac412c7f Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam Date: Mon, 4 Jan 2021 09:41:35 +0530 Subject: mtd: parsers: Add Qcom SMEM parser NAND based Qualcomm platforms have the partition table populated in the Shared Memory (SMEM). Hence, add a parser for parsing the partitions from it. Signed-off-by: Manivannan Sadhasivam Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210104041137.113075-3-manivannan.sadhasivam@linaro.org --- drivers/mtd/parsers/Kconfig | 8 ++ drivers/mtd/parsers/Makefile | 1 + drivers/mtd/parsers/qcomsmempart.c | 170 +++++++++++++++++++++++++++++++++++++ 3 files changed, 179 insertions(+) create mode 100644 drivers/mtd/parsers/qcomsmempart.c --- a/drivers/mtd/parsers/Kconfig +++ b/drivers/mtd/parsers/Kconfig @@ -196,6 +196,14 @@ config MTD_REDBOOT_PARTS_READONLY endif # MTD_REDBOOT_PARTS +config MTD_QCOMSMEM_PARTS + tristate "Qualcomm SMEM NAND flash partition parser" + depends on MTD_NAND_QCOM || COMPILE_TEST + depends on QCOM_SMEM + help + This provides support for parsing partitions from Shared Memory (SMEM) + for NAND flash on Qualcomm platforms. + config MTD_ROUTERBOOT_PARTS tristate "RouterBoot flash partition parser" depends on MTD && OF --- a/drivers/mtd/parsers/Makefile +++ b/drivers/mtd/parsers/Makefile @@ -13,4 +13,5 @@ obj-$(CONFIG_MTD_AFS_PARTS) += afs.o obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o obj-$(CONFIG_MTD_SHARPSL_PARTS) += sharpslpart.o obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o +obj-$(CONFIG_MTD_QCOMSMEM_PARTS) += qcomsmempart.o obj-$(CONFIG_MTD_ROUTERBOOT_PARTS) += routerbootpart.o --- /dev/null +++ b/drivers/mtd/parsers/qcomsmempart.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Qualcomm SMEM NAND flash partition parser + * + * Copyright (C) 2020, Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include + +#define SMEM_AARM_PARTITION_TABLE 9 +#define SMEM_APPS 0 + +#define SMEM_FLASH_PART_MAGIC1 0x55ee73aa +#define SMEM_FLASH_PART_MAGIC2 0xe35ebddb +#define SMEM_FLASH_PTABLE_V3 3 +#define SMEM_FLASH_PTABLE_V4 4 +#define SMEM_FLASH_PTABLE_MAX_PARTS_V3 16 +#define SMEM_FLASH_PTABLE_MAX_PARTS_V4 48 +#define SMEM_FLASH_PTABLE_HDR_LEN (4 * sizeof(u32)) +#define SMEM_FLASH_PTABLE_NAME_SIZE 16 + +/** + * struct smem_flash_pentry - SMEM Flash partition entry + * @name: Name of the partition + * @offset: Offset in blocks + * @length: Length of the partition in blocks + * @attr: Flags for this partition + */ +struct smem_flash_pentry { + char name[SMEM_FLASH_PTABLE_NAME_SIZE]; + __le32 offset; + __le32 length; + u8 attr; +} __packed __aligned(4); + +/** + * struct smem_flash_ptable - SMEM Flash partition table + * @magic1: Partition table Magic 1 + * @magic2: Partition table Magic 2 + * @version: Partition table version + * @numparts: Number of partitions in this ptable + * @pentry: Flash partition entries belonging to this ptable + */ +struct smem_flash_ptable { + __le32 magic1; + __le32 magic2; + __le32 version; + __le32 numparts; + struct smem_flash_pentry pentry[SMEM_FLASH_PTABLE_MAX_PARTS_V4]; +} __packed __aligned(4); + +static int parse_qcomsmem_part(struct mtd_info *mtd, + const struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + struct smem_flash_pentry *pentry; + struct smem_flash_ptable *ptable; + size_t len = SMEM_FLASH_PTABLE_HDR_LEN; + struct mtd_partition *parts; + int ret, i, numparts; + char *name, *c; + + pr_debug("Parsing partition table info from SMEM\n"); + ptable = qcom_smem_get(SMEM_APPS, SMEM_AARM_PARTITION_TABLE, &len); + if (IS_ERR(ptable)) { + pr_err("Error reading partition table header\n"); + return PTR_ERR(ptable); + } + + /* Verify ptable magic */ + if (le32_to_cpu(ptable->magic1) != SMEM_FLASH_PART_MAGIC1 || + le32_to_cpu(ptable->magic2) != SMEM_FLASH_PART_MAGIC2) { + pr_err("Partition table magic verification failed\n"); + return -EINVAL; + } + + /* Ensure that # of partitions is less than the max we have allocated */ + numparts = le32_to_cpu(ptable->numparts); + if (numparts > SMEM_FLASH_PTABLE_MAX_PARTS_V4) { + pr_err("Partition numbers exceed the max limit\n"); + return -EINVAL; + } + + /* Find out length of partition data based on table version */ + if (le32_to_cpu(ptable->version) <= SMEM_FLASH_PTABLE_V3) { + len = SMEM_FLASH_PTABLE_HDR_LEN + SMEM_FLASH_PTABLE_MAX_PARTS_V3 * + sizeof(struct smem_flash_pentry); + } else if (le32_to_cpu(ptable->version) == SMEM_FLASH_PTABLE_V4) { + len = SMEM_FLASH_PTABLE_HDR_LEN + SMEM_FLASH_PTABLE_MAX_PARTS_V4 * + sizeof(struct smem_flash_pentry); + } else { + pr_err("Unknown ptable version (%d)", le32_to_cpu(ptable->version)); + return -EINVAL; + } + + /* + * Now that the partition table header has been parsed, verified + * and the length of the partition table calculated, read the + * complete partition table + */ + ptable = qcom_smem_get(SMEM_APPS, SMEM_AARM_PARTITION_TABLE, &len); + if (IS_ERR_OR_NULL(ptable)) { + pr_err("Error reading partition table\n"); + return PTR_ERR(ptable); + } + + parts = kcalloc(numparts, sizeof(*parts), GFP_KERNEL); + if (!parts) + return -ENOMEM; + + for (i = 0; i < numparts; i++) { + pentry = &ptable->pentry[i]; + if (pentry->name[0] == '\0') + continue; + + name = kstrdup(pentry->name, GFP_KERNEL); + if (!name) { + ret = -ENOMEM; + goto out_free_parts; + } + + /* Convert name to lower case */ + for (c = name; *c != '\0'; c++) + *c = tolower(*c); + + parts[i].name = name; + parts[i].offset = le32_to_cpu(pentry->offset) * mtd->erasesize; + parts[i].mask_flags = pentry->attr; + parts[i].size = le32_to_cpu(pentry->length) * mtd->erasesize; + pr_debug("%d: %s offs=0x%08x size=0x%08x attr:0x%08x\n", + i, pentry->name, le32_to_cpu(pentry->offset), + le32_to_cpu(pentry->length), pentry->attr); + } + + pr_debug("SMEM partition table found: ver: %d len: %d\n", + le32_to_cpu(ptable->version), numparts); + *pparts = parts; + + return numparts; + +out_free_parts: + while (--i >= 0) + kfree(parts[i].name); + kfree(parts); + *pparts = NULL; + + return ret; +} + +static const struct of_device_id qcomsmem_of_match_table[] = { + { .compatible = "qcom,smem-part" }, + {}, +}; +MODULE_DEVICE_TABLE(of, qcomsmem_of_match_table); + +static struct mtd_part_parser mtd_parser_qcomsmem = { + .parse_fn = parse_qcomsmem_part, + .name = "qcomsmem", + .of_match_table = qcomsmem_of_match_table, +}; +module_mtd_part_parser(mtd_parser_qcomsmem); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Qualcomm SMEM NAND flash partition parser");