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Subject[PATCH v4 2/4] mtd: parsers: Add Qcom SMEM parser
Date
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 <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

diff --git a/drivers/mtd/parsers/Kconfig b/drivers/mtd/parsers/Kconfig
index e72354322f62..d90c30229052 100644
--- a/drivers/mtd/parsers/Kconfig
+++ b/drivers/mtd/parsers/Kconfig
@@ -160,3 +160,11 @@ config MTD_REDBOOT_PARTS_READONLY
'FIS directory' images, enable this option.

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.
diff --git a/drivers/mtd/parsers/Makefile b/drivers/mtd/parsers/Makefile
index b0c5f62f9e85..50eb0b0a2210 100644
--- a/drivers/mtd/parsers/Makefile
+++ b/drivers/mtd/parsers/Makefile
@@ -9,3 +9,4 @@ 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
diff --git a/drivers/mtd/parsers/qcomsmempart.c b/drivers/mtd/parsers/qcomsmempart.c
new file mode 100644
index 000000000000..808cb33d71f8
--- /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 <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");
--
2.25.1
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