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// SPDX-License-Identifier: GPL-2.0-only
/*
* Qualcomm SMEM NAND flash partition parser
*
* Copyright (C) 2020, Linaro Ltd.
*/
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>
#include <linux/soc/qcom/smem.h>
#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 <manivannan.sadhasivam@linaro.org>");
MODULE_DESCRIPTION("Qualcomm SMEM NAND flash partition parser");
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